1566 files changed, 95876 insertions, 24269 deletions

diff --git a/t/.gitattributes b/t/.gitattributes
index df05434..b9cea17 100644
--- a/t/.gitattributes
+++ b/t/.gitattributes
@@ -1,13 +1,12 @@
 t[0-9][0-9][0-9][0-9]/* -whitespace
 /chainlint/*.expect eol=lf
-/diff-lib/* eol=lf
 /t0110/url-* binary
 /t3206/* eol=lf
 /t3900/*.txt eol=lf
 /t3901/*.txt eol=lf
-/t4034/*/* eol=lf
 /t4013/* eol=lf
 /t4018/* eol=lf
+/t4034/*/* eol=lf
 /t4051/* eol=lf
 /t4100/* eol=lf
 /t4101/* eol=lf
@@ -23,3 +22,4 @@ t[0-9][0-9][0-9][0-9]/* -whitespace
 /t7500/* eol=lf
 /t8005/*.txt eol=lf
 /t9*/*.dump eol=lf
+/t0040*.sh whitespace=-indent-with-non-tab
diff --git a/t/Makefile b/t/Makefile
index c83fd18..2d95046 100644
--- a/t/Makefile
+++ b/t/Makefile
@@ -1,8 +1,15 @@
+# The default target of this Makefile is...
+all::
+
+# Import tree-wide shared Makefile behavior and libraries
+include ../shared.mak
+
 # Run tests
 #
 # Copyright (c) 2005 Junio C Hamano
 #
 
+-include ../config.mak.uname
 -include ../config.mak.autogen
 -include ../config.mak
 
@@ -14,6 +21,7 @@ TAR ?= $(TAR)
 RM ?= rm -f
 PROVE ?= prove
 DEFAULT_TEST_TARGET ?= test
+DEFAULT_UNIT_TEST_TARGET ?= unit-tests-raw
 TEST_LINT ?= test-lint
 
 ifdef TEST_OUTPUT_DIRECTORY
@@ -32,15 +40,25 @@ TEST_RESULTS_DIRECTORY_SQ = $(subst ','\'',$(TEST_RESULTS_DIRECTORY))
 CHAINLINTTMP_SQ = $(subst ','\'',$(CHAINLINTTMP))
 
 T = $(sort $(wildcard t[0-9][0-9][0-9][0-9]-*.sh))
-TGITWEB = $(sort $(wildcard t95[0-9][0-9]-*.sh))
 THELPERS = $(sort $(filter-out $(T),$(wildcard *.sh)))
+TLIBS = $(sort $(wildcard lib-*.sh)) annotate-tests.sh
+TPERF = $(sort $(wildcard perf/p[0-9][0-9][0-9][0-9]-*.sh))
+TINTEROP = $(sort $(wildcard interop/i[0-9][0-9][0-9][0-9]-*.sh))
 CHAINLINTTESTS = $(sort $(patsubst chainlint/%.test,%,$(wildcard chainlint/*.test)))
-CHAINLINT = sed -f chainlint.sed
+CHAINLINT = '$(PERL_PATH_SQ)' chainlint.pl
+UNIT_TEST_SOURCES = $(wildcard unit-tests/t-*.c)
+UNIT_TEST_PROGRAMS = $(patsubst unit-tests/%.c,unit-tests/bin/%$(X),$(UNIT_TEST_SOURCES))
+UNIT_TESTS = $(sort $(filter-out unit-tests/bin/t-basic%,$(UNIT_TEST_PROGRAMS)))
+
+# `test-chainlint` (which is a dependency of `test-lint`, `test` and `prove`)
+# checks all tests in all scripts via a single invocation, so tell individual
+# scripts not to run the external "chainlint.pl" script themselves
+CHAINLINTSUPPRESS = GIT_TEST_EXT_CHAIN_LINT=0 && export GIT_TEST_EXT_CHAIN_LINT &&
 
-all: $(DEFAULT_TEST_TARGET)
+all:: $(DEFAULT_TEST_TARGET)
 
 test: pre-clean check-chainlint $(TEST_LINT)
-	$(MAKE) aggregate-results-and-cleanup
+	$(CHAINLINTSUPPRESS) $(MAKE) aggregate-results-and-cleanup
 
 failed:
 	@failed=$$(cd '$(TEST_RESULTS_DIRECTORY_SQ)' && \
@@ -49,20 +67,32 @@ failed:
 	test -z "$$failed" || $(MAKE) $$failed
 
 prove: pre-clean check-chainlint $(TEST_LINT)
-	@echo "*** prove ***"; $(PROVE) --exec '$(TEST_SHELL_PATH_SQ)' $(GIT_PROVE_OPTS) $(T) :: $(GIT_TEST_OPTS)
+	@echo "*** prove ***"; $(CHAINLINTSUPPRESS) $(PROVE) --exec '$(TEST_SHELL_PATH_SQ)' $(GIT_PROVE_OPTS) $(T) :: $(GIT_TEST_OPTS)
 	$(MAKE) clean-except-prove-cache
 
 $(T):
 	@echo "*** $@ ***"; '$(TEST_SHELL_PATH_SQ)' $@ $(GIT_TEST_OPTS)
 
+$(UNIT_TESTS):
+	@echo "*** $@ ***"; $@
+
+.PHONY: unit-tests unit-tests-raw unit-tests-prove
+unit-tests: $(DEFAULT_UNIT_TEST_TARGET)
+
+unit-tests-raw: $(UNIT_TESTS)
+
+unit-tests-prove:
+	@echo "*** prove - unit tests ***"; $(PROVE) $(GIT_PROVE_OPTS) $(UNIT_TESTS)
+
 pre-clean:
 	$(RM) -r '$(TEST_RESULTS_DIRECTORY_SQ)'
 
 clean-except-prove-cache: clean-chainlint
-	$(RM) -r 'trash directory'.* '$(TEST_RESULTS_DIRECTORY_SQ)'
+	$(RM) -r 'trash directory'.*
 	$(RM) -r valgrind/bin
 
 clean: clean-except-prove-cache
+	$(RM) -r '$(TEST_RESULTS_DIRECTORY_SQ)'
 	$(RM) .prove
 
 clean-chainlint:
@@ -70,28 +100,40 @@ clean-chainlint:
 
 check-chainlint:
 	@mkdir -p '$(CHAINLINTTMP_SQ)' && \
-	err=0 && \
 	for i in $(CHAINLINTTESTS); do \
-		$(CHAINLINT) <chainlint/$$i.test | \
-		sed -e '/^# LINT: /d' >'$(CHAINLINTTMP_SQ)'/$$i.actual && \
-		diff -u chainlint/$$i.expect '$(CHAINLINTTMP_SQ)'/$$i.actual || err=1; \
-	done && exit $$err
+		echo "test_expect_success '$$i' '" && \
+		sed -e '/^# LINT: /d' chainlint/$$i.test && \
+		echo "'"; \
+	done >'$(CHAINLINTTMP_SQ)'/tests && \
+	{ \
+		echo "# chainlint: $(CHAINLINTTMP_SQ)/tests" && \
+		for i in $(CHAINLINTTESTS); do \
+			echo "# chainlint: $$i" && \
+			cat chainlint/$$i.expect; \
+		done \
+	} >'$(CHAINLINTTMP_SQ)'/expect && \
+	$(CHAINLINT) --emit-all '$(CHAINLINTTMP_SQ)'/tests | \
+		sed -e 's/^[1-9][0-9]* //' >'$(CHAINLINTTMP_SQ)'/actual && \
+	diff -u '$(CHAINLINTTMP_SQ)'/expect '$(CHAINLINTTMP_SQ)'/actual
 
 test-lint: test-lint-duplicates test-lint-executable test-lint-shell-syntax \
 	test-lint-filenames
+ifneq ($(GIT_TEST_CHAIN_LINT),0)
+test-lint: test-chainlint
+endif
 
 test-lint-duplicates:
-	@dups=`echo $(T) | tr ' ' '\n' | sed 's/-.*//' | sort | uniq -d` && \
+	@dups=`echo $(T) $(TPERF) | tr ' ' '\n' | sed 's/-.*//' | sort | uniq -d` && \
 		test -z "$$dups" || { \
 		echo >&2 "duplicate test numbers:" $$dups; exit 1; }
 
 test-lint-executable:
-	@bad=`for i in $(T); do test -x "$$i" || echo $$i; done` && \
+	@bad=`for i in $(T) $(TPERF); do test -x "$$i" || echo $$i; done` && \
 		test -z "$$bad" || { \
 		echo >&2 "non-executable tests:" $$bad; exit 1; }
 
 test-lint-shell-syntax:
-	@'$(PERL_PATH_SQ)' check-non-portable-shell.pl $(T) $(THELPERS)
+	@'$(PERL_PATH_SQ)' check-non-portable-shell.pl $(T) $(THELPERS) $(TPERF)
 
 test-lint-filenames:
 	@# We do *not* pass a glob to ls-files but use grep instead, to catch
@@ -101,17 +143,15 @@ test-lint-filenames:
 		test -z "$$bad" || { \
 		echo >&2 "non-portable file name(s): $$bad"; exit 1; }
 
+test-chainlint:
+	@$(CHAINLINT) $(T) $(TLIBS) $(TPERF) $(TINTEROP)
+
 aggregate-results-and-cleanup: $(T)
 	$(MAKE) aggregate-results
 	$(MAKE) clean
 
 aggregate-results:
-	for f in '$(TEST_RESULTS_DIRECTORY_SQ)'/t*-*.counts; do \
-		echo "$$f"; \
-	done | '$(SHELL_PATH_SQ)' ./aggregate-results.sh
-
-gitweb-test:
-	$(MAKE) $(TGITWEB)
+	@'$(SHELL_PATH_SQ)' ./aggregate-results.sh '$(TEST_RESULTS_DIRECTORY_SQ)'
 
 valgrind:
 	$(MAKE) GIT_TEST_OPTS="$(GIT_TEST_OPTS) --valgrind"
@@ -119,4 +159,5 @@ valgrind:
 perf:
 	$(MAKE) -C perf/ all
 
-.PHONY: pre-clean $(T) aggregate-results clean valgrind perf check-chainlint clean-chainlint
+.PHONY: pre-clean $(T) aggregate-results clean valgrind perf \
+	check-chainlint clean-chainlint test-chainlint $(UNIT_TESTS)
diff --git a/t/README b/t/README
index 70ec61c..d9e0e07 100644
--- a/t/README
+++ b/t/README
@@ -32,7 +32,14 @@ the tests.
     ok 2 - plain with GIT_WORK_TREE
     ok 3 - plain bare
 
-Since the tests all output TAP (see http://testanything.org) they can
+t/Makefile defines a target for each test file, such that you can also use
+shell pattern matching to run a subset of the tests:
+
+    make *checkout*
+
+will run all tests with 'checkout' in their filename.
+
+Since the tests all output TAP (see https://testanything.org) they can
 be run with any TAP harness. Here's an example of parallel testing
 powered by a recent version of prove(1):
 
@@ -258,26 +265,28 @@ For an individual test suite --run could be used to specify that
 only some tests should be run or that some tests should be
 excluded from a run.
 
-The argument for --run is a list of individual test numbers or
-ranges with an optional negation prefix that define what tests in
-a test suite to include in the run.  A range is two numbers
-separated with a dash and matches a range of tests with both ends
-been included.  You may omit the first or the second number to
-mean "from the first test" or "up to the very last test"
-respectively.
-
-Optional prefix of '!' means that the test or a range of tests
-should be excluded from the run.
-
-If --run starts with an unprefixed number or range the initial
-set of tests to run is empty. If the first item starts with '!'
+The argument for --run, <test-selector>, is a list of description
+substrings or globs or individual test numbers or ranges with an
+optional negation prefix (of '!') that define what tests in a test
+suite to include (or exclude, if negated) in the run.  A range is two
+numbers separated with a dash and specifies an inclusive range of tests
+to run.  You may omit the first or the second number to
+mean "from the first test" or "up to the very last test" respectively.
+
+The argument to --run is split on commas into separate strings,
+numbers, and ranges, and picks all tests that match any of the
+individual selection criteria.  If the substring of the description
+text that you want to match includes a comma, use the glob character
+'?' instead.  For example --run='rebase,merge?cherry-pick' would match
+on all tests that match either the glob *rebase* or the glob
+*merge?cherry-pick*.
+
+If --run starts with an unprefixed number or range, the initial
+set of tests to run is empty.  If the first item starts with '!',
 all the tests are added to the initial set.  After initial set is
-determined every test number or range is added or excluded from
+determined, every test number or range is added or excluded from
 the set one by one, from left to right.
 
-Individual numbers or ranges could be separated either by a space
-or a comma.
-
 For example, to run only tests up to a specific test (21), one
 could do this:
 
@@ -290,7 +299,7 @@ or this:
 Common case is to run several setup tests (1, 2, 3) and then a
 specific test (21) that relies on that setup:
 
-    $ sh ./t9200-git-cvsexport-commit.sh --run='1 2 3 21'
+    $ sh ./t9200-git-cvsexport-commit.sh --run='1,2,3,21'
 
 or:
 
@@ -298,17 +307,17 @@ or:
 
 or:
 
-    $ sh ./t9200-git-cvsexport-commit.sh --run='-3 21'
+    $ sh ./t9200-git-cvsexport-commit.sh --run='-3,21'
 
 As noted above, the test set is built by going through the items
 from left to right, so this:
 
-    $ sh ./t9200-git-cvsexport-commit.sh --run='1-4 !3'
+    $ sh ./t9200-git-cvsexport-commit.sh --run='1-4,!3'
 
 will run tests 1, 2, and 4.  Items that come later have higher
 precedence.  It means that this:
 
-    $ sh ./t9200-git-cvsexport-commit.sh --run='!3 1-4'
+    $ sh ./t9200-git-cvsexport-commit.sh --run='!3,1-4'
 
 would just run tests from 1 to 4, including 3.
 
@@ -317,6 +326,18 @@ test in the test suite except from 7 up to 11:
 
     $ sh ./t9200-git-cvsexport-commit.sh --run='!7-11'
 
+Sometimes there may be multiple tests with e.g. "setup" in their name
+that are needed and rather than figuring out the number for all of them
+we can just use "setup" as a substring/glob to match against the test
+description:
+
+    $ sh ./t0050-filesystem.sh --run=setup,9-11
+
+or one could select both the setup tests and the rename ones (assuming all
+relevant tests had those words in their descriptions):
+
+    $ sh ./t0050-filesystem.sh --run=setup,rename
+
 Some tests in a test suite rely on the previous tests performing
 certain actions, specifically some tests are designated as
 "setup" test, so you cannot _arbitrarily_ disable one test and
@@ -344,15 +365,51 @@ whether this mode is active, and e.g. skip some tests that are hard to
 refactor to deal with it. The "SYMLINKS" prerequisite is currently
 excluded as so much relies on it, but this might change in the future.
 
-GIT_TEST_GETTEXT_POISON=<boolean> turns all strings marked for
-translation into gibberish if true. Used for spotting those tests that
-need to be marked with a C_LOCALE_OUTPUT prerequisite when adding more
-strings for translation. See "Testing marked strings" in po/README for
-details.
-
 GIT_TEST_SPLIT_INDEX=<boolean> forces split-index mode on the whole
 test suite. Accept any boolean values that are accepted by git-config.
 
+GIT_TEST_PASSING_SANITIZE_LEAK=true skips those tests that haven't
+declared themselves as leak-free by setting
+"TEST_PASSES_SANITIZE_LEAK=true" before sourcing "test-lib.sh". This
+test mode is used by the "linux-leaks" CI target.
+
+GIT_TEST_PASSING_SANITIZE_LEAK=check checks that our
+"TEST_PASSES_SANITIZE_LEAK=true" markings are current. Rather than
+skipping those tests that haven't set "TEST_PASSES_SANITIZE_LEAK=true"
+before sourcing "test-lib.sh" this mode runs them with
+"--invert-exit-code". This is used to check that there's a one-to-one
+mapping between "TEST_PASSES_SANITIZE_LEAK=true" and those tests that
+pass under "SANITIZE=leak". This is especially useful when testing a
+series that fixes various memory leaks with "git rebase -x".
+
+GIT_TEST_SANITIZE_LEAK_LOG=true will log memory leaks to
+"test-results/$TEST_NAME.leak/trace.*" files. The logs include a
+"dedup_token" (see +"ASAN_OPTIONS=help=1 ./git") and other options to
+make logs +machine-readable.
+
+With GIT_TEST_SANITIZE_LEAK_LOG=true we'll look at the leak logs
+before exiting and exit on failure if the logs showed that we had a
+memory leak, even if the test itself would have otherwise passed. This
+allows us to catch e.g. missing &&-chaining. This is especially useful
+when combined with "GIT_TEST_PASSING_SANITIZE_LEAK", see below.
+
+GIT_TEST_PASSING_SANITIZE_LEAK=check when combined with "--immediate"
+will run to completion faster, and result in the same failing
+tests. The only practical reason to run
+GIT_TEST_PASSING_SANITIZE_LEAK=check without "--immediate" is to
+combine it with "GIT_TEST_SANITIZE_LEAK_LOG=true". If we stop at the
+first failing test case our leak logs won't show subsequent leaks we
+might have run into.
+
+GIT_TEST_PASSING_SANITIZE_LEAK=(true|check) will not catch all memory
+leaks unless combined with GIT_TEST_SANITIZE_LEAK_LOG=true. Some tests
+run "git" (or "test-tool" etc.) without properly checking the exit
+code, or git will invoke itself and fail to ferry the abort() exit
+code to the original caller. When the two modes are combined we'll
+look at the "test-results/$TEST_NAME.leak/trace.*" files at the end of
+the test run to see if had memory leaks which the test itself didn't
+catch.
+
 GIT_TEST_PROTOCOL_VERSION=<n>, when set, makes 'protocol.version'
 default to n.
 
@@ -385,13 +442,17 @@ every 'git commit-graph write', as if the `--changed-paths` option was
 passed in.
 
 GIT_TEST_FSMONITOR=$PWD/t7519/fsmonitor-all exercises the fsmonitor
-code path for utilizing a file system monitor to speed up detecting
-new or changed files.
+code paths for utilizing a (hook based) file system monitor to speed up
+detecting new or changed files.
 
 GIT_TEST_INDEX_VERSION=<n> exercises the index read/write code path
 for the index version specified.  Can be set to any valid version
 (currently 2, 3, or 4).
 
+GIT_TEST_PACK_USE_BITMAP_BOUNDARY_TRAVERSAL=<boolean> if enabled will
+use the boundary-based bitmap traversal algorithm. See the documentation
+of `pack.useBitmapBoundaryTraversal` for more details.
+
 GIT_TEST_PACK_SPARSE=<boolean> if disabled will default the pack-objects
 builtin to use the non-sparse object walk. This can still be overridden by
 the --sparse command-line argument.
@@ -399,10 +460,6 @@ the --sparse command-line argument.
 GIT_TEST_PRELOAD_INDEX=<boolean> exercises the preload-index code path
 by overriding the minimum number of cache entries required per thread.
 
-GIT_TEST_ADD_I_USE_BUILTIN=<boolean>, when true, enables the
-built-in version of git add -i. See 'add.interactive.useBuiltin' in
-git-config(1).
-
 GIT_TEST_INDEX_THREADS=<n> enables exercising the multi-threaded loading
 of the index for the whole test suite by bypassing the default number of
 cache entries and thread minimums. Setting this to 1 will make the
@@ -412,6 +469,10 @@ GIT_TEST_MULTI_PACK_INDEX=<boolean>, when true, forces the multi-pack-
 index to be written after every 'git repack' command, and overrides the
 'core.multiPackIndex' setting to true.
 
+GIT_TEST_MULTI_PACK_INDEX_WRITE_BITMAP=<boolean>, when true, sets the
+'--bitmap' option on all invocations of 'git multi-pack-index write',
+and ignores pack-objects' '--write-bitmap-index'.
+
 GIT_TEST_SIDEBAND_ALL=<boolean>, when true, overrides the
 'uploadpack.allowSidebandAll' setting to true, and when false, forces
 fetch-pack to not request sideband-all (even if the server advertises
@@ -421,6 +482,36 @@ GIT_TEST_DISALLOW_ABBREVIATED_OPTIONS=<boolean>, when true (which is
 the default when running tests), errors out when an abbreviated option
 is used.
 
+GIT_TEST_DEFAULT_HASH=<hash-algo> specifies which hash algorithm to
+use in the test scripts. Recognized values for <hash-algo> are "sha1"
+and "sha256".
+
+GIT_TEST_DEFAULT_REF_FORMAT=<format> specifies which ref storage format
+to use in the test scripts. Recognized values for <format> are "files".
+
+GIT_TEST_NO_WRITE_REV_INDEX=<boolean>, when true disables the
+'pack.writeReverseIndex' setting.
+
+GIT_TEST_SPARSE_INDEX=<boolean>, when true enables index writes to use the
+sparse-index format by default.
+
+GIT_TEST_CHECKOUT_WORKERS=<n> overrides the 'checkout.workers' setting
+to <n> and 'checkout.thresholdForParallelism' to 0, forcing the
+execution of the parallel-checkout code.
+
+GIT_TEST_FATAL_REGISTER_SUBMODULE_ODB=<boolean>, when true, makes
+registering submodule ODBs as alternates a fatal action. Support for
+this environment variable can be removed once the migration to
+explicitly providing repositories when accessing submodule objects is
+complete or needs to be abandoned for whatever reason (in which case the
+migrated codepaths still retain their performance benefits).
+
+GIT_TEST_REQUIRE_PREREQ=<list> allows specifying a space separated list of
+prereqs that are required to succeed. If a prereq in this list is triggered by
+a test and then fails then the whole test run will abort. This can help to make
+sure the expected tests are executed and not silently skipped when their
+dependency breaks or is simply not present in a new environment.
+
 Naming Tests
 ------------
 
@@ -496,13 +587,67 @@ This test harness library does the following things:
    consistently when command line arguments --verbose (or -v),
    --debug (or -d), and --immediate (or -i) is given.
 
+Recommended style
+-----------------
+
+ - Keep the test_expect_* function call and test title on
+   the same line.
+
+   For example, with test_expect_success, write it like:
+
+  test_expect_success 'test title' '
+      ... test body ...
+  '
+
+   Instead of:
+
+  test_expect_success \
+      'test title' \
+      '... test body ...'
+
+ - End the line with an opening single quote.
+
+ - Indent here-document bodies, and use "<<-" instead of "<<"
+   to strip leading TABs used for indentation:
+
+  test_expect_success 'test something' '
+      cat >expect <<-\EOF &&
+      one
+      two
+      three
+      EOF
+      test_something > actual &&
+      test_cmp expect actual
+  '
+
+   Instead of:
+
+  test_expect_success 'test something' '
+      cat >expect <<\EOF &&
+  one
+  two
+  three
+  EOF
+      test_something > actual &&
+      test_cmp expect actual
+  '
+
+ - Quote or escape the EOF delimiter that begins a here-document if
+   there is no parameter or other expansion in it, to signal readers
+   that they can skim it more casually:
+
+  cmd <<-\EOF
+  literal here-document text without any expansion
+  EOF
+
+
 Do's & don'ts
 -------------
 
 Here are a few examples of things you probably should and shouldn't do
 when writing tests.
 
-Here are the "do's:"
+The "do's:"
 
  - Put all code inside test_expect_success and other assertions.
 
@@ -586,6 +731,26 @@ Here are the "do's:"
    Note that we still &&-chain the loop to propagate failures from
    earlier commands.
 
+ - Repeat tests with slightly different arguments in a loop.
+
+   In some cases it may make sense to re-run the same set of tests with
+   different options or commands to ensure that the command behaves
+   despite the different parameters. This can be achieved by looping
+   around a specific parameter:
+
+	for arg in '' "--foo"
+	do
+		test_expect_success "test command ${arg:-without arguments}" '
+			command $arg
+		'
+	done
+
+   Note that while the test title uses double quotes ("), the test body
+   should continue to use single quotes (') to avoid breakage in case the
+   values contain e.g. quoting characters. The loop variable will be
+   accessible regardless of the single quotes as the test body is passed
+   to `eval`.
+
 
 And here are the "don'ts:"
 
@@ -726,7 +891,8 @@ Test harness library
 --------------------
 
 There are a handful helper functions defined in the test harness
-library for your script to use.
+library for your script to use. Some of them are listed below;
+see test-lib-functions.sh for the full list and their options.
 
  - test_expect_success [<prereq>] <message> <script>
 
@@ -751,7 +917,7 @@ library for your script to use.
    rare case where your test depends on more than one:
 
 	test_expect_success PERL,PYTHON 'yo dawg' \
-	    ' test $(perl -E 'print eval "1 +" . qx[python -c "print 2"]') == "4" '
+	    ' test $(perl -E '\''print eval "1 +" . qx[python -c "print(2)"]'\'') = "4" '
 
  - test_expect_failure [<prereq>] <message> <script>
 
@@ -772,10 +938,12 @@ library for your script to use.
    argument.  This is primarily meant for use during the
    development of a new test script.
 
- - debug <git-command>
+ - debug [options] <git-command>
 
    Run a git command inside a debugger. This is primarily meant for
-   use when debugging a failing test script.
+   use when debugging a failing test script. With '-t', use your
+   original TERM instead of test-lib.sh's "dumb", so that your
+   debugger interface has colors.
 
  - test_done
 
@@ -826,32 +994,6 @@ library for your script to use.
 	    test_done
 	fi
 
- - test_external [<prereq>] <message> <external> <script>
-
-   Execute a <script> with an <external> interpreter (like perl). This
-   was added for tests like t9700-perl-git.sh which do most of their
-   work in an external test script.
-
-	test_external \
-	    'GitwebCache::*FileCache*' \
-	    perl "$TEST_DIRECTORY"/t9503/test_cache_interface.pl
-
-   If the test is outputting its own TAP you should set the
-   test_external_has_tap variable somewhere before calling the first
-   test_external* function. See t9700-perl-git.sh for an example.
-
-	# The external test will outputs its own plan
-	test_external_has_tap=1
-
- - test_external_without_stderr [<prereq>] <message> <external> <script>
-
-   Like test_external but fail if there's any output on stderr,
-   instead of checking the exit code.
-
-	test_external_without_stderr \
-	    'Perl API' \
-	    perl "$TEST_DIRECTORY"/t9700/test.pl
-
  - test_expect_code <exit-code> <command>
 
    Run a command and ensure that it exits with the given exit code.
@@ -899,13 +1041,13 @@ library for your script to use.
 
    Check whether a file has the length it is expected to.
 
- - test_path_is_file <path> [<diagnosis>]
-   test_path_is_dir <path> [<diagnosis>]
-   test_path_is_missing <path> [<diagnosis>]
+ - test_path_is_file <path>
+   test_path_is_dir <path>
+   test_path_is_missing <path>
 
    Check if the named path is a file, if the named path is a
    directory, or if the named path does not exist, respectively,
-   and fail otherwise, showing the <diagnosis> text.
+   and fail otherwise.
 
  - test_when_finished <script>
 
@@ -962,7 +1104,7 @@ library for your script to use.
 	EOF
 
 
- - test_pause
+ - test_pause [options]
 
 	This command is useful for writing and debugging tests and must be
 	removed before submitting. It halts the execution of the test and
@@ -989,6 +1131,12 @@ library for your script to use.
    the symbolic link in the file system and a part that does; then only
    the latter part need be protected by a SYMLINKS prerequisite (see below).
 
+ - test_path_is_executable
+
+   This tests whether a file is executable and prints an error message
+   if not. This must be used only under the POSIXPERM prerequisite
+   (see below).
+
  - test_oid_init
 
    This function loads facts and useful object IDs related to the hash
@@ -1086,18 +1234,6 @@ use these, and "test_set_prereq" for how to define your own.
    Git was compiled with support for PCRE. Wrap any tests
    that use git-grep --perl-regexp or git-grep -P in these.
 
- - LIBPCRE1
-
-   Git was compiled with PCRE v1 support via
-   USE_LIBPCRE1=YesPlease. Wrap any PCRE using tests that for some
-   reason need v1 of the PCRE library instead of v2 in these.
-
- - LIBPCRE2
-
-   Git was compiled with PCRE v2 support via
-   USE_LIBPCRE2=YesPlease. Wrap any PCRE using tests that for some
-   reason need v2 of the PCRE library instead of v1 in these.
-
  - CASE_INSENSITIVE_FS
 
    Test is run on a case insensitive file system.
@@ -1111,6 +1247,12 @@ use these, and "test_set_prereq" for how to define your own.
 
    Git wasn't compiled with NO_PTHREADS=YesPlease.
 
+ - REFFILES
+
+   Test is specific to packed/loose ref storage, and should be
+   disabled for other ref storage backends
+
+
 Tips for Writing Tests
 ----------------------
 
@@ -1124,8 +1266,8 @@ and it knows that the object ID of an empty tree is a certain
 because the things the very basic core test tries to achieve is
 to serve as a basis for people who are changing the Git internals
 drastically.  For these people, after making certain changes,
-not seeing failures from the basic test _is_ a failure.  And
-such drastic changes to the core Git that even changes these
+not seeing failures from the basic test _is_ a failure.  Any
+Git core changes so drastic that they change even these
 otherwise supposedly stable object IDs should be accompanied by
 an update to t0000-basic.sh.
 
@@ -1135,7 +1277,7 @@ knowledge of the core Git internals.  If all the test scripts
 hardcoded the object IDs like t0000-basic.sh does, that defeats
 the purpose of t0000-basic.sh, which is to isolate that level of
 validation in one place.  Your test also ends up needing
-updating when such a change to the internal happens, so do _not_
+an update whenever the internals change, so do _not_
 do it and leave the low level of validation to t0000-basic.sh.
 
 Test coverage
@@ -1166,7 +1308,7 @@ Devel::Cover module. To install it do:
    sudo aptitude install libdevel-cover-perl
 
    # From the CPAN with cpanminus
-   curl -L http://cpanmin.us | perl - --sudo --self-upgrade
+   curl -L https://cpanmin.us/ | perl - --sudo --self-upgrade
    cpanm --sudo Devel::Cover
 
 Then, at the top-level:
diff --git a/t/aggregate-results.sh b/t/aggregate-results.sh
index 7913e20..6e3bcc4 100755
--- a/t/aggregate-results.sh
+++ b/t/aggregate-results.sh
@@ -6,8 +6,9 @@ success=0
 failed=0
 broken=0
 total=0
+missing_prereq=
 
-while read file
+for file in "$1"/t*-*.counts
 do
 	while read type value
 	do
@@ -30,10 +31,26 @@ do
 			broken=$(($broken + $value)) ;;
 		total)
 			total=$(($total + $value)) ;;
+		missing_prereq)
+			missing_prereq="$missing_prereq,$value" ;;
 		esac
 	done <"$file"
 done
 
+if test -n "$missing_prereq"
+then
+	unique_missing_prereq=$(
+		echo $missing_prereq |
+		tr -s "," "\n" |
+		grep -v '^$' |
+		sort -u |
+		paste -s -d ' ')
+	if test -n "$unique_missing_prereq"
+	then
+		printf "\nmissing prereq: $unique_missing_prereq\n\n"
+	fi
+fi
+
 if test -n "$failed_tests"
 then
 	printf "\nfailed test(s):$failed_tests\n\n"
diff --git a/t/annotate-tests.sh b/t/annotate-tests.sh
index d933af5..8757245 100644
--- a/t/annotate-tests.sh
+++ b/t/annotate-tests.sh
@@ -56,6 +56,10 @@ check_count () {
 	' "$@" <actual
 }
 
+get_progress_result () {
+	tr '\015' '\012' | tail -n 1
+}
+
 test_expect_success 'setup A lines' '
 	echo "1A quick brown fox jumps over the" >file &&
 	echo "lazy dog" >>file &&
@@ -68,6 +72,32 @@ test_expect_success 'blame 1 author' '
 	check_count A 2
 '
 
+test_expect_success 'blame working copy' '
+	test_when_finished "git restore file" &&
+	echo "1A quick brown fox jumps over the" >file &&
+	echo "another lazy dog" >>file &&
+	check_count A 1 "Not Committed Yet" 1
+'
+
+test_expect_success 'blame with --contents' '
+	check_count --contents=file A 2
+'
+
+test_expect_success 'blame with --contents in a bare repo' '
+	git clone --bare . bare-contents.git &&
+	(
+		cd bare-contents.git &&
+		echo "1A quick brown fox jumps over the" >contents &&
+		check_count --contents=contents A 1
+	)
+'
+
+test_expect_success 'blame with --contents changed' '
+	echo "1A quick brown fox jumps over the" >contents &&
+	echo "another lazy dog" >>contents &&
+	check_count --contents=contents A 1 "External file (--contents)" 1
+'
+
 test_expect_success 'blame in a bare repo without starting commit' '
 	git clone --bare . bare.git &&
 	(
@@ -94,8 +124,12 @@ test_expect_success 'blame 2 authors' '
 	check_count A 2 B 2
 '
 
+test_expect_success 'blame with --contents and revision' '
+	check_count -h testTag --contents=file A 2 "External file (--contents)" 2
+'
+
 test_expect_success 'setup B1 lines (branch1)' '
-	git checkout -b branch1 master &&
+	git checkout -b branch1 main &&
 	echo "3A slow green fox jumps into the" >>file &&
 	echo "well." >>file &&
 	GIT_AUTHOR_NAME="B1" GIT_AUTHOR_EMAIL="B1@test.git" \
@@ -107,7 +141,7 @@ test_expect_success 'blame 2 authors + 1 branch1 author' '
 '
 
 test_expect_success 'setup B2 lines (branch2)' '
-	git checkout -b branch2 master &&
+	git checkout -b branch2 main &&
 	sed -e "s/2A quick brown/4A quick brown lazy dog/" <file >file.new &&
 	mv file.new file &&
 	GIT_AUTHOR_NAME="B2" GIT_AUTHOR_EMAIL="B2@test.git" \
@@ -131,11 +165,11 @@ test_expect_success 'blame --first-parent blames merge for branch1' '
 '
 
 test_expect_success 'blame ancestor' '
-	check_count -h master A 2 B 2
+	check_count -h main A 2 B 2
 '
 
 test_expect_success 'blame great-ancestor' '
-	check_count -h master^ A 2
+	check_count -h main^ A 2
 '
 
 test_expect_success 'setup evil merge' '
@@ -149,7 +183,7 @@ test_expect_success 'blame evil merge' '
 
 test_expect_success 'blame huge graft' '
 	test_when_finished "git checkout branch2" &&
-	test_when_finished "rm -f .git/info/grafts" &&
+	test_when_finished "rm -rf .git/info" &&
 	graft= &&
 	for i in 0 1 2
 	do
@@ -161,9 +195,10 @@ test_expect_success 'blame huge graft' '
 			GIT_AUTHOR_NAME=$i$j GIT_AUTHOR_EMAIL=$i$j@test.git \
 			git commit -a -m "$i$j" &&
 			commit=$(git rev-parse --verify HEAD) &&
-			graft="$graft$commit "
+			graft="$graft$commit " || return 1
 		done
 	done &&
+	mkdir .git/info &&
 	printf "%s " $graft >.git/info/grafts &&
 	check_count -h 00 01 1 10 1
 '
@@ -479,6 +514,28 @@ test_expect_success 'blame -L ^:RE (absolute: end-of-file)' '
 	check_count -f hello.c -L$n -L^:ma.. F 4 G 1 H 1
 '
 
+test_expect_success 'blame -L :funcname with userdiff driver' '
+	cat >file.template <<-\EOF &&
+	DO NOT MATCH THIS LINE
+	function RIGHT(a, b) result(c)
+	AS THE DEFAULT DRIVER WOULD
+
+	integer, intent(in) :: ChangeMe
+	EOF
+
+	fortran_file=file.f03 &&
+	test_when_finished "rm .gitattributes" &&
+	echo "$fortran_file diff=fortran" >.gitattributes &&
+
+	test_commit --author "A <A@test.git>" \
+		"add" "$fortran_file" \
+		"$(cat file.template)" &&
+	test_commit --author "B <B@test.git>" \
+		"change" "$fortran_file" \
+		"$(sed -e s/ChangeMe/IWasChanged/ file.template)" &&
+	check_count -f "$fortran_file" -L:RIGHT A 3 B 1
+'
+
 test_expect_success 'setup incremental' '
 	(
 	GIT_AUTHOR_NAME=I &&
@@ -582,3 +639,39 @@ test_expect_success 'blame -L X,-N (non-numeric N)' '
 test_expect_success 'blame -L ,^/RE/' '
 	test_must_fail $PROG -L1,^/99/ file
 '
+
+test_expect_success 'blame progress on a full file' '
+	cat >expect <<-\EOF &&
+	Blaming lines: 100% (10/10), done.
+	EOF
+
+	GIT_PROGRESS_DELAY=0 \
+	git blame --progress hello.c 2>stderr &&
+
+	get_progress_result <stderr >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'blame progress on a single range' '
+	cat >expect <<-\EOF &&
+	Blaming lines: 100% (4/4), done.
+	EOF
+
+	GIT_PROGRESS_DELAY=0 \
+	git blame --progress -L 3,6 hello.c 2>stderr &&
+
+	get_progress_result <stderr >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'blame progress on multiple ranges' '
+	cat >expect <<-\EOF &&
+	Blaming lines: 100% (7/7), done.
+	EOF
+
+	GIT_PROGRESS_DELAY=0 \
+	git blame --progress -L 3,6 -L 8,10 hello.c 2>stderr &&
+
+	get_progress_result <stderr >actual &&
+	test_cmp expect actual
+'
diff --git a/t/chainlint.pl b/t/chainlint.pl
new file mode 100755
index 0000000..556ee91
--- /dev/null
+++ b/t/chainlint.pl
@@ -0,0 +1,832 @@
+#!/usr/bin/env perl
+#
+# Copyright (c) 2021-2022 Eric Sunshine <sunshine@sunshineco.com>
+#
+# This tool scans shell scripts for test definitions and checks those tests for
+# problems, such as broken &&-chains, which might hide bugs in the tests
+# themselves or in behaviors being exercised by the tests.
+#
+# Input arguments are pathnames of shell scripts containing test definitions,
+# or globs referencing a collection of scripts. For each problem discovered,
+# the pathname of the script containing the test is printed along with the test
+# name and the test body with a `?!FOO?!` annotation at the location of each
+# detected problem, where "FOO" is a tag such as "AMP" which indicates a broken
+# &&-chain. Returns zero if no problems are discovered, otherwise non-zero.
+
+use warnings;
+use strict;
+use Config;
+use File::Glob;
+use Getopt::Long;
+
+my $jobs = -1;
+my $show_stats;
+my $emit_all;
+
+# Lexer tokenizes POSIX shell scripts. It is roughly modeled after section 2.3
+# "Token Recognition" of POSIX chapter 2 "Shell Command Language". Although
+# similar to lexical analyzers for other languages, this one differs in a few
+# substantial ways due to quirks of the shell command language.
+#
+# For instance, in many languages, newline is just whitespace like space or
+# TAB, but in shell a newline is a command separator, thus a distinct lexical
+# token. A newline is significant and returned as a distinct token even at the
+# end of a shell comment.
+#
+# In other languages, `1+2` would typically be scanned as three tokens
+# (`1`, `+`, and `2`), but in shell it is a single token. However, the similar
+# `1 + 2`, which embeds whitepace, is scanned as three token in shell, as well.
+# In shell, several characters with special meaning lose that meaning when not
+# surrounded by whitespace. For instance, the negation operator `!` is special
+# when standing alone surrounded by whitespace; whereas in `foo!uucp` it is
+# just a plain character in the longer token "foo!uucp". In many other
+# languages, `"string"/foo:'string'` might be scanned as five tokens ("string",
+# `/`, `foo`, `:`, and 'string'), but in shell, it is just a single token.
+#
+# The lexical analyzer for the shell command language is also somewhat unusual
+# in that it recursively invokes the parser to handle the body of `$(...)`
+# expressions which can contain arbitrary shell code. Such expressions may be
+# encountered both inside and outside of double-quoted strings.
+#
+# The lexical analyzer is responsible for consuming shell here-doc bodies which
+# extend from the line following a `<<TAG` operator until a line consisting
+# solely of `TAG`. Here-doc consumption begins when a newline is encountered.
+# It is legal for multiple here-doc `<<TAG` operators to be present on a single
+# line, in which case their bodies must be present one following the next, and
+# are consumed in the (left-to-right) order the `<<TAG` operators appear on the
+# line. A special complication is that the bodies of all here-docs must be
+# consumed when the newline is encountered even if the parse context depth has
+# changed. For instance, in `cat <<A && x=$(cat <<B &&\n`, bodies of here-docs
+# "A" and "B" must be consumed even though "A" was introduced outside the
+# recursive parse context in which "B" was introduced and in which the newline
+# is encountered.
+package Lexer;
+
+sub new {
+	my ($class, $parser, $s) = @_;
+	bless {
+		parser => $parser,
+		buff => $s,
+		lineno => 1,
+		heretags => []
+	} => $class;
+}
+
+sub scan_heredoc_tag {
+	my $self = shift @_;
+	${$self->{buff}} =~ /\G(-?)/gc;
+	my $indented = $1;
+	my $token = $self->scan_token();
+	return "<<$indented" unless $token;
+	my $tag = $token->[0];
+	$tag =~ s/['"\\]//g;
+	$$token[0] = $indented ? "\t$tag" : "$tag";
+	push(@{$self->{heretags}}, $token);
+	return "<<$indented$tag";
+}
+
+sub scan_op {
+	my ($self, $c) = @_;
+	my $b = $self->{buff};
+	return $c unless $$b =~ /\G(.)/sgc;
+	my $cc = $c . $1;
+	return scan_heredoc_tag($self) if $cc eq '<<';
+	return $cc if $cc =~ /^(?:&&|\|\||>>|;;|<&|>&|<>|>\|)$/;
+	pos($$b)--;
+	return $c;
+}
+
+sub scan_sqstring {
+	my $self = shift @_;
+	${$self->{buff}} =~ /\G([^']*'|.*\z)/sgc;
+	my $s = $1;
+	$self->{lineno} += () = $s =~ /\n/sg;
+	return "'" . $s;
+}
+
+sub scan_dqstring {
+	my $self = shift @_;
+	my $b = $self->{buff};
+	my $s = '"';
+	while (1) {
+		# slurp up non-special characters
+		$s .= $1 if $$b =~ /\G([^"\$\\]+)/gc;
+		# handle special characters
+		last unless $$b =~ /\G(.)/sgc;
+		my $c = $1;
+		$s .= '"', last if $c eq '"';
+		$s .= '$' . $self->scan_dollar(), next if $c eq '$';
+		if ($c eq '\\') {
+			$s .= '\\', last unless $$b =~ /\G(.)/sgc;
+			$c = $1;
+			$self->{lineno}++, next if $c eq "\n"; # line splice
+			# backslash escapes only $, `, ", \ in dq-string
+			$s .= '\\' unless $c =~ /^[\$`"\\]$/;
+			$s .= $c;
+			next;
+		}
+		die("internal error scanning dq-string '$c'\n");
+	}
+	$self->{lineno} += () = $s =~ /\n/sg;
+	return $s;
+}
+
+sub scan_balanced {
+	my ($self, $c1, $c2) = @_;
+	my $b = $self->{buff};
+	my $depth = 1;
+	my $s = $c1;
+	while ($$b =~ /\G([^\Q$c1$c2\E]*(?:[\Q$c1$c2\E]|\z))/gc) {
+		$s .= $1;
+		$depth++, next if $s =~ /\Q$c1\E$/;
+		$depth--;
+		last if $depth == 0;
+	}
+	$self->{lineno} += () = $s =~ /\n/sg;
+	return $s;
+}
+
+sub scan_subst {
+	my $self = shift @_;
+	my @tokens = $self->{parser}->parse(qr/^\)$/);
+	$self->{parser}->next_token(); # closing ")"
+	return @tokens;
+}
+
+sub scan_dollar {
+	my $self = shift @_;
+	my $b = $self->{buff};
+	return $self->scan_balanced('(', ')') if $$b =~ /\G\((?=\()/gc; # $((...))
+	return '(' . join(' ', map {$_->[0]} $self->scan_subst()) . ')' if $$b =~ /\G\(/gc; # $(...)
+	return $self->scan_balanced('{', '}') if $$b =~ /\G\{/gc; # ${...}
+	return $1 if $$b =~ /\G(\w+)/gc; # $var
+	return $1 if $$b =~ /\G([@*#?$!0-9-])/gc; # $*, $1, $$, etc.
+	return '';
+}
+
+sub swallow_heredocs {
+	my $self = shift @_;
+	my $b = $self->{buff};
+	my $tags = $self->{heretags};
+	while (my $tag = shift @$tags) {
+		my $start = pos($$b);
+		my $indent = $$tag[0] =~ s/^\t// ? '\\s*' : '';
+		$$b =~ /(?:\G|\n)$indent\Q$$tag[0]\E(?:\n|\z)/gc;
+		if (pos($$b) > $start) {
+			my $body = substr($$b, $start, pos($$b) - $start);
+			$self->{lineno} += () = $body =~ /\n/sg;
+			next;
+		}
+		push(@{$self->{parser}->{problems}}, ['UNCLOSED-HEREDOC', $tag]);
+		$$b =~ /(?:\G|\n).*\z/gc; # consume rest of input
+		my $body = substr($$b, $start, pos($$b) - $start);
+		$self->{lineno} += () = $body =~ /\n/sg;
+		last;
+	}
+}
+
+sub scan_token {
+	my $self = shift @_;
+	my $b = $self->{buff};
+	my $token = '';
+	my ($start, $startln);
+RESTART:
+	$startln = $self->{lineno};
+	$$b =~ /\G[ \t]+/gc; # skip whitespace (but not newline)
+	$start = pos($$b) || 0;
+	$self->{lineno}++, return ["\n", $start, pos($$b), $startln, $startln] if $$b =~ /\G#[^\n]*(?:\n|\z)/gc; # comment
+	while (1) {
+		# slurp up non-special characters
+		$token .= $1 if $$b =~ /\G([^\\;&|<>(){}'"\$\s]+)/gc;
+		# handle special characters
+		last unless $$b =~ /\G(.)/sgc;
+		my $c = $1;
+		pos($$b)--, last if $c =~ /^[ \t]$/; # whitespace ends token
+		pos($$b)--, last if length($token) && $c =~ /^[;&|<>(){}\n]$/;
+		$token .= $self->scan_sqstring(), next if $c eq "'";
+		$token .= $self->scan_dqstring(), next if $c eq '"';
+		$token .= $c . $self->scan_dollar(), next if $c eq '$';
+		$self->{lineno}++, $self->swallow_heredocs(), $token = $c, last if $c eq "\n";
+		$token = $self->scan_op($c), last if $c =~ /^[;&|<>]$/;
+		$token = $c, last if $c =~ /^[(){}]$/;
+		if ($c eq '\\') {
+			$token .= '\\', last unless $$b =~ /\G(.)/sgc;
+			$c = $1;
+			$self->{lineno}++, next if $c eq "\n" && length($token); # line splice
+			$self->{lineno}++, goto RESTART if $c eq "\n"; # line splice
+			$token .= '\\' . $c;
+			next;
+		}
+		die("internal error scanning character '$c'\n");
+	}
+	return length($token) ? [$token, $start, pos($$b), $startln, $self->{lineno}] : undef;
+}
+
+# ShellParser parses POSIX shell scripts (with minor extensions for Bash). It
+# is a recursive descent parser very roughly modeled after section 2.10 "Shell
+# Grammar" of POSIX chapter 2 "Shell Command Language".
+package ShellParser;
+
+sub new {
+	my ($class, $s) = @_;
+	my $self = bless {
+		buff => [],
+		stop => [],
+		output => []
+	} => $class;
+	$self->{lexer} = Lexer->new($self, $s);
+	return $self;
+}
+
+sub next_token {
+	my $self = shift @_;
+	return pop(@{$self->{buff}}) if @{$self->{buff}};
+	return $self->{lexer}->scan_token();
+}
+
+sub untoken {
+	my $self = shift @_;
+	push(@{$self->{buff}}, @_);
+}
+
+sub peek {
+	my $self = shift @_;
+	my $token = $self->next_token();
+	return undef unless defined($token);
+	$self->untoken($token);
+	return $token;
+}
+
+sub stop_at {
+	my ($self, $token) = @_;
+	return 1 unless defined($token);
+	my $stop = ${$self->{stop}}[-1] if @{$self->{stop}};
+	return defined($stop) && $token->[0] =~ $stop;
+}
+
+sub expect {
+	my ($self, $expect) = @_;
+	my $token = $self->next_token();
+	return $token if defined($token) && $token->[0] eq $expect;
+	push(@{$self->{output}}, "?!ERR?! expected '$expect' but found '" . (defined($token) ? $token->[0] : "<end-of-input>") . "'\n");
+	$self->untoken($token) if defined($token);
+	return ();
+}
+
+sub optional_newlines {
+	my $self = shift @_;
+	my @tokens;
+	while (my $token = $self->peek()) {
+		last unless $token->[0] eq "\n";
+		push(@tokens, $self->next_token());
+	}
+	return @tokens;
+}
+
+sub parse_group {
+	my $self = shift @_;
+	return ($self->parse(qr/^}$/),
+		$self->expect('}'));
+}
+
+sub parse_subshell {
+	my $self = shift @_;
+	return ($self->parse(qr/^\)$/),
+		$self->expect(')'));
+}
+
+sub parse_case_pattern {
+	my $self = shift @_;
+	my @tokens;
+	while (defined(my $token = $self->next_token())) {
+		push(@tokens, $token);
+		last if $token->[0] eq ')';
+	}
+	return @tokens;
+}
+
+sub parse_case {
+	my $self = shift @_;
+	my @tokens;
+	push(@tokens,
+	     $self->next_token(), # subject
+	     $self->optional_newlines(),
+	     $self->expect('in'),
+	     $self->optional_newlines());
+	while (1) {
+		my $token = $self->peek();
+		last unless defined($token) && $token->[0] ne 'esac';
+		push(@tokens,
+		     $self->parse_case_pattern(),
+		     $self->optional_newlines(),
+		     $self->parse(qr/^(?:;;|esac)$/)); # item body
+		$token = $self->peek();
+		last unless defined($token) && $token->[0] ne 'esac';
+		push(@tokens,
+		     $self->expect(';;'),
+		     $self->optional_newlines());
+	}
+	push(@tokens, $self->expect('esac'));
+	return @tokens;
+}
+
+sub parse_for {
+	my $self = shift @_;
+	my @tokens;
+	push(@tokens,
+	     $self->next_token(), # variable
+	     $self->optional_newlines());
+	my $token = $self->peek();
+	if (defined($token) && $token->[0] eq 'in') {
+		push(@tokens,
+		     $self->expect('in'),
+		     $self->optional_newlines());
+	}
+	push(@tokens,
+	     $self->parse(qr/^do$/), # items
+	     $self->expect('do'),
+	     $self->optional_newlines(),
+	     $self->parse_loop_body(),
+	     $self->expect('done'));
+	return @tokens;
+}
+
+sub parse_if {
+	my $self = shift @_;
+	my @tokens;
+	while (1) {
+		push(@tokens,
+		     $self->parse(qr/^then$/), # if/elif condition
+		     $self->expect('then'),
+		     $self->optional_newlines(),
+		     $self->parse(qr/^(?:elif|else|fi)$/)); # if/elif body
+		my $token = $self->peek();
+		last unless defined($token) && $token->[0] eq 'elif';
+		push(@tokens, $self->expect('elif'));
+	}
+	my $token = $self->peek();
+	if (defined($token) && $token->[0] eq 'else') {
+		push(@tokens,
+		     $self->expect('else'),
+		     $self->optional_newlines(),
+		     $self->parse(qr/^fi$/)); # else body
+	}
+	push(@tokens, $self->expect('fi'));
+	return @tokens;
+}
+
+sub parse_loop_body {
+	my $self = shift @_;
+	return $self->parse(qr/^done$/);
+}
+
+sub parse_loop {
+	my $self = shift @_;
+	return ($self->parse(qr/^do$/), # condition
+		$self->expect('do'),
+		$self->optional_newlines(),
+		$self->parse_loop_body(),
+		$self->expect('done'));
+}
+
+sub parse_func {
+	my $self = shift @_;
+	return ($self->expect('('),
+		$self->expect(')'),
+		$self->optional_newlines(),
+		$self->parse_cmd()); # body
+}
+
+sub parse_bash_array_assignment {
+	my $self = shift @_;
+	my @tokens = $self->expect('(');
+	while (defined(my $token = $self->next_token())) {
+		push(@tokens, $token);
+		last if $token->[0] eq ')';
+	}
+	return @tokens;
+}
+
+my %compound = (
+	'{' => \&parse_group,
+	'(' => \&parse_subshell,
+	'case' => \&parse_case,
+	'for' => \&parse_for,
+	'if' => \&parse_if,
+	'until' => \&parse_loop,
+	'while' => \&parse_loop);
+
+sub parse_cmd {
+	my $self = shift @_;
+	my $cmd = $self->next_token();
+	return () unless defined($cmd);
+	return $cmd if $cmd->[0] eq "\n";
+
+	my $token;
+	my @tokens = $cmd;
+	if ($cmd->[0] eq '!') {
+		push(@tokens, $self->parse_cmd());
+		return @tokens;
+	} elsif (my $f = $compound{$cmd->[0]}) {
+		push(@tokens, $self->$f());
+	} elsif (defined($token = $self->peek()) && $token->[0] eq '(') {
+		if ($cmd->[0] !~ /\w=$/) {
+			push(@tokens, $self->parse_func());
+			return @tokens;
+		}
+		my @array = $self->parse_bash_array_assignment();
+		$tokens[-1]->[0] .= join(' ', map {$_->[0]} @array);
+		$tokens[-1]->[2] = $array[$#array][2] if @array;
+	}
+
+	while (defined(my $token = $self->next_token())) {
+		$self->untoken($token), last if $self->stop_at($token);
+		push(@tokens, $token);
+		last if $token->[0] =~ /^(?:[;&\n|]|&&|\|\|)$/;
+	}
+	push(@tokens, $self->next_token()) if $tokens[-1]->[0] ne "\n" && defined($token = $self->peek()) && $token->[0] eq "\n";
+	return @tokens;
+}
+
+sub accumulate {
+	my ($self, $tokens, $cmd) = @_;
+	push(@$tokens, @$cmd);
+}
+
+sub parse {
+	my ($self, $stop) = @_;
+	push(@{$self->{stop}}, $stop);
+	goto DONE if $self->stop_at($self->peek());
+	my @tokens;
+	while (my @cmd = $self->parse_cmd()) {
+		$self->accumulate(\@tokens, \@cmd);
+		last if $self->stop_at($self->peek());
+	}
+DONE:
+	pop(@{$self->{stop}});
+	return @tokens;
+}
+
+# TestParser is a subclass of ShellParser which, beyond parsing shell script
+# code, is also imbued with semantic knowledge of test construction, and checks
+# tests for common problems (such as broken &&-chains) which might hide bugs in
+# the tests themselves or in behaviors being exercised by the tests. As such,
+# TestParser is only called upon to parse test bodies, not the top-level
+# scripts in which the tests are defined.
+package TestParser;
+
+use base 'ShellParser';
+
+sub new {
+	my $class = shift @_;
+	my $self = $class->SUPER::new(@_);
+	$self->{problems} = [];
+	return $self;
+}
+
+sub find_non_nl {
+	my $tokens = shift @_;
+	my $n = shift @_;
+	$n = $#$tokens if !defined($n);
+	$n-- while $n >= 0 && $$tokens[$n]->[0] eq "\n";
+	return $n;
+}
+
+sub ends_with {
+	my ($tokens, $needles) = @_;
+	my $n = find_non_nl($tokens);
+	for my $needle (reverse(@$needles)) {
+		return undef if $n < 0;
+		$n = find_non_nl($tokens, $n), next if $needle eq "\n";
+		return undef if $$tokens[$n]->[0] !~ $needle;
+		$n--;
+	}
+	return 1;
+}
+
+sub match_ending {
+	my ($tokens, $endings) = @_;
+	for my $needles (@$endings) {
+		next if @$tokens < scalar(grep {$_ ne "\n"} @$needles);
+		return 1 if ends_with($tokens, $needles);
+	}
+	return undef;
+}
+
+sub parse_loop_body {
+	my $self = shift @_;
+	my @tokens = $self->SUPER::parse_loop_body(@_);
+	# did loop signal failure via "|| return" or "|| exit"?
+	return @tokens if !@tokens || grep {$_->[0] =~ /^(?:return|exit|\$\?)$/} @tokens;
+	# did loop upstream of a pipe signal failure via "|| echo 'impossible
+	# text'" as the final command in the loop body?
+	return @tokens if ends_with(\@tokens, [qr/^\|\|$/, "\n", qr/^echo$/, qr/^.+$/]);
+	# flag missing "return/exit" handling explicit failure in loop body
+	my $n = find_non_nl(\@tokens);
+	push(@{$self->{problems}}, ['LOOP', $tokens[$n]]);
+	return @tokens;
+}
+
+my @safe_endings = (
+	[qr/^(?:&&|\|\||\||&)$/],
+	[qr/^(?:exit|return)$/, qr/^(?:\d+|\$\?)$/],
+	[qr/^(?:exit|return)$/, qr/^(?:\d+|\$\?)$/, qr/^;$/],
+	[qr/^(?:exit|return|continue)$/],
+	[qr/^(?:exit|return|continue)$/, qr/^;$/]);
+
+sub accumulate {
+	my ($self, $tokens, $cmd) = @_;
+	my $problems = $self->{problems};
+
+	# no previous command to check for missing "&&"
+	goto DONE unless @$tokens;
+
+	# new command is empty line; can't yet check if previous is missing "&&"
+	goto DONE if @$cmd == 1 && $$cmd[0]->[0] eq "\n";
+
+	# did previous command end with "&&", "|", "|| return" or similar?
+	goto DONE if match_ending($tokens, \@safe_endings);
+
+	# if this command handles "$?" specially, then okay for previous
+	# command to be missing "&&"
+	for my $token (@$cmd) {
+		goto DONE if $token->[0] =~ /\$\?/;
+	}
+
+	# if this command is "false", "return 1", or "exit 1" (which signal
+	# failure explicitly), then okay for all preceding commands to be
+	# missing "&&"
+	if ($$cmd[0]->[0] =~ /^(?:false|return|exit)$/) {
+		@$problems = grep {$_->[0] ne 'AMP'} @$problems;
+		goto DONE;
+	}
+
+	# flag missing "&&" at end of previous command
+	my $n = find_non_nl($tokens);
+	push(@$problems, ['AMP', $tokens->[$n]]) unless $n < 0;
+
+DONE:
+	$self->SUPER::accumulate($tokens, $cmd);
+}
+
+# ScriptParser is a subclass of ShellParser which identifies individual test
+# definitions within test scripts, and passes each test body through TestParser
+# to identify possible problems. ShellParser detects test definitions not only
+# at the top-level of test scripts but also within compound commands such as
+# loops and function definitions.
+package ScriptParser;
+
+use base 'ShellParser';
+
+sub new {
+	my $class = shift @_;
+	my $self = $class->SUPER::new(@_);
+	$self->{ntests} = 0;
+	return $self;
+}
+
+# extract the raw content of a token, which may be a single string or a
+# composition of multiple strings and non-string character runs; for instance,
+# `"test body"` unwraps to `test body`; `word"a b"42'c d'` to `worda b42c d`
+sub unwrap {
+	my $token = (@_ ? shift @_ : $_)->[0];
+	# simple case: 'sqstring' or "dqstring"
+	return $token if $token =~ s/^'([^']*)'$/$1/;
+	return $token if $token =~ s/^"([^"]*)"$/$1/;
+
+	# composite case
+	my ($s, $q, $escaped);
+	while (1) {
+		# slurp up non-special characters
+		$s .= $1 if $token =~ /\G([^\\'"]*)/gc;
+		# handle special characters
+		last unless $token =~ /\G(.)/sgc;
+		my $c = $1;
+		$q = undef, next if defined($q) && $c eq $q;
+		$q = $c, next if !defined($q) && $c =~ /^['"]$/;
+		if ($c eq '\\') {
+			last unless $token =~ /\G(.)/sgc;
+			$c = $1;
+			$s .= '\\' if $c eq "\n"; # preserve line splice
+		}
+		$s .= $c;
+	}
+	return $s
+}
+
+sub check_test {
+	my $self = shift @_;
+	my ($title, $body) = map(unwrap, @_);
+	$self->{ntests}++;
+	my $parser = TestParser->new(\$body);
+	my @tokens = $parser->parse();
+	my $problems = $parser->{problems};
+	return unless $emit_all || @$problems;
+	my $c = main::fd_colors(1);
+	my $lineno = $_[1]->[3];
+	my $start = 0;
+	my $checked = '';
+	for (sort {$a->[1]->[2] <=> $b->[1]->[2]} @$problems) {
+		my ($label, $token) = @$_;
+		my $pos = $token->[2];
+		$checked .= substr($body, $start, $pos - $start) . " ?!$label?! ";
+		$start = $pos;
+	}
+	$checked .= substr($body, $start);
+	$checked =~ s/^/$lineno++ . ' '/mge;
+	$checked =~ s/^\d+ \n//;
+	$checked =~ s/(\s) \?!/$1?!/mg;
+	$checked =~ s/\?! (\s)/?!$1/mg;
+	$checked =~ s/(\?![^?]+\?!)/$c->{rev}$c->{red}$1$c->{reset}/mg;
+	$checked =~ s/^\d+/$c->{dim}$&$c->{reset}/mg;
+	$checked .= "\n" unless $checked =~ /\n$/;
+	push(@{$self->{output}}, "$c->{blue}# chainlint: $title$c->{reset}\n$checked");
+}
+
+sub parse_cmd {
+	my $self = shift @_;
+	my @tokens = $self->SUPER::parse_cmd();
+	return @tokens unless @tokens && $tokens[0]->[0] =~ /^test_expect_(?:success|failure)$/;
+	my $n = $#tokens;
+	$n-- while $n >= 0 && $tokens[$n]->[0] =~ /^(?:[;&\n|]|&&|\|\|)$/;
+	$self->check_test($tokens[1], $tokens[2]) if $n == 2; # title body
+	$self->check_test($tokens[2], $tokens[3]) if $n > 2;  # prereq title body
+	return @tokens;
+}
+
+# main contains high-level functionality for processing command-line switches,
+# feeding input test scripts to ScriptParser, and reporting results.
+package main;
+
+my $getnow = sub { return time(); };
+my $interval = sub { return time() - shift; };
+if (eval {require Time::HiRes; Time::HiRes->import(); 1;}) {
+	$getnow = sub { return [Time::HiRes::gettimeofday()]; };
+	$interval = sub { return Time::HiRes::tv_interval(shift); };
+}
+
+# Restore TERM if test framework set it to "dumb" so 'tput' will work; do this
+# outside of get_colors() since under 'ithreads' all threads use %ENV of main
+# thread and ignore %ENV changes in subthreads.
+$ENV{TERM} = $ENV{USER_TERM} if $ENV{USER_TERM};
+
+my @NOCOLORS = (bold => '', rev => '', dim => '', reset => '', blue => '', green => '', red => '');
+my %COLORS = ();
+sub get_colors {
+	return \%COLORS if %COLORS;
+	if (exists($ENV{NO_COLOR})) {
+		%COLORS = @NOCOLORS;
+		return \%COLORS;
+	}
+	if ($ENV{TERM} =~ /xterm|xterm-\d+color|xterm-new|xterm-direct|nsterm|nsterm-\d+color|nsterm-direct/) {
+		%COLORS = (bold  => "\e[1m",
+			   rev   => "\e[7m",
+			   dim   => "\e[2m",
+			   reset => "\e[0m",
+			   blue  => "\e[34m",
+			   green => "\e[32m",
+			   red   => "\e[31m");
+		return \%COLORS;
+	}
+	if (system("tput sgr0 >/dev/null 2>&1") == 0 &&
+	    system("tput bold >/dev/null 2>&1") == 0 &&
+	    system("tput rev  >/dev/null 2>&1") == 0 &&
+	    system("tput dim  >/dev/null 2>&1") == 0 &&
+	    system("tput setaf 1 >/dev/null 2>&1") == 0) {
+		%COLORS = (bold  => `tput bold`,
+			   rev   => `tput rev`,
+			   dim   => `tput dim`,
+			   reset => `tput sgr0`,
+			   blue  => `tput setaf 4`,
+			   green => `tput setaf 2`,
+			   red   => `tput setaf 1`);
+		return \%COLORS;
+	}
+	%COLORS = @NOCOLORS;
+	return \%COLORS;
+}
+
+my %FD_COLORS = ();
+sub fd_colors {
+	my $fd = shift;
+	return $FD_COLORS{$fd} if exists($FD_COLORS{$fd});
+	$FD_COLORS{$fd} = -t $fd ? get_colors() : {@NOCOLORS};
+	return $FD_COLORS{$fd};
+}
+
+sub ncores {
+	# Windows
+	return $ENV{NUMBER_OF_PROCESSORS} if exists($ENV{NUMBER_OF_PROCESSORS});
+	# Linux / MSYS2 / Cygwin / WSL
+	do { local @ARGV='/proc/cpuinfo'; return scalar(grep(/^processor[\s\d]*:/, <>)); } if -r '/proc/cpuinfo';
+	# macOS & BSD
+	return qx/sysctl -n hw.ncpu/ if $^O =~ /(?:^darwin$|bsd)/;
+	return 1;
+}
+
+sub show_stats {
+	my ($start_time, $stats) = @_;
+	my $walltime = $interval->($start_time);
+	my ($usertime) = times();
+	my ($total_workers, $total_scripts, $total_tests, $total_errs) = (0, 0, 0, 0);
+	my $c = fd_colors(2);
+	print(STDERR $c->{green});
+	for (@$stats) {
+		my ($worker, $nscripts, $ntests, $nerrs) = @$_;
+		print(STDERR "worker $worker: $nscripts scripts, $ntests tests, $nerrs errors\n");
+		$total_workers++;
+		$total_scripts += $nscripts;
+		$total_tests += $ntests;
+		$total_errs += $nerrs;
+	}
+	printf(STDERR "total: %d workers, %d scripts, %d tests, %d errors, %.2fs/%.2fs (wall/user)$c->{reset}\n", $total_workers, $total_scripts, $total_tests, $total_errs, $walltime, $usertime);
+}
+
+sub check_script {
+	my ($id, $next_script, $emit) = @_;
+	my ($nscripts, $ntests, $nerrs) = (0, 0, 0);
+	while (my $path = $next_script->()) {
+		$nscripts++;
+		my $fh;
+		unless (open($fh, "<", $path)) {
+			$emit->("?!ERR?! $path: $!\n");
+			next;
+		}
+		my $s = do { local $/; <$fh> };
+		close($fh);
+		my $parser = ScriptParser->new(\$s);
+		1 while $parser->parse_cmd();
+		if (@{$parser->{output}}) {
+			my $c = fd_colors(1);
+			my $s = join('', @{$parser->{output}});
+			$emit->("$c->{bold}$c->{blue}# chainlint: $path$c->{reset}\n" . $s);
+			$nerrs += () = $s =~ /\?![^?]+\?!/g;
+		}
+		$ntests += $parser->{ntests};
+	}
+	return [$id, $nscripts, $ntests, $nerrs];
+}
+
+sub exit_code {
+	my $stats = shift @_;
+	for (@$stats) {
+		my ($worker, $nscripts, $ntests, $nerrs) = @$_;
+		return 1 if $nerrs;
+	}
+	return 0;
+}
+
+Getopt::Long::Configure(qw{bundling});
+GetOptions(
+	"emit-all!" => \$emit_all,
+	"jobs|j=i" => \$jobs,
+	"stats|show-stats!" => \$show_stats) or die("option error\n");
+$jobs = ncores() if $jobs < 1;
+
+my $start_time = $getnow->();
+my @stats;
+
+my @scripts;
+push(@scripts, File::Glob::bsd_glob($_)) for (@ARGV);
+unless (@scripts) {
+	show_stats($start_time, \@stats) if $show_stats;
+	exit;
+}
+
+unless ($Config{useithreads} && eval {
+	require threads; threads->import();
+	require Thread::Queue; Thread::Queue->import();
+	1;
+	}) {
+	push(@stats, check_script(1, sub { shift(@scripts); }, sub { print(@_); }));
+	show_stats($start_time, \@stats) if $show_stats;
+	exit(exit_code(\@stats));
+}
+
+my $script_queue = Thread::Queue->new();
+my $output_queue = Thread::Queue->new();
+
+sub next_script { return $script_queue->dequeue(); }
+sub emit { $output_queue->enqueue(@_); }
+
+sub monitor {
+	while (my $s = $output_queue->dequeue()) {
+		print($s);
+	}
+}
+
+my $mon = threads->create({'context' => 'void'}, \&monitor);
+threads->create({'context' => 'list'}, \&check_script, $_, \&next_script, \&emit) for 1..$jobs;
+
+$script_queue->enqueue(@scripts);
+$script_queue->end();
+
+for (threads->list()) {
+	push(@stats, $_->join()) unless $_ == $mon;
+}
+
+$output_queue->end();
+$mon->join();
+
+show_stats($start_time, \@stats) if $show_stats;
+exit(exit_code(\@stats));
diff --git a/t/chainlint.sed b/t/chainlint.sed
deleted file mode 100644
index 70df40e..0000000
--- a/t/chainlint.sed
+++ /dev/null
@@ -1,369 +0,0 @@
-#------------------------------------------------------------------------------
-# Detect broken &&-chains in tests.
-#
-# At present, only &&-chains in subshells are examined by this linter;
-# top-level &&-chains are instead checked directly by the test framework. Like
-# the top-level &&-chain linter, the subshell linter (intentionally) does not
-# check &&-chains within {...} blocks.
-#
-# Checking for &&-chain breakage is done line-by-line by pure textual
-# inspection.
-#
-# Incomplete lines (those ending with "\") are stitched together with following
-# lines to simplify processing, particularly of "one-liner" statements.
-# Top-level here-docs are swallowed to avoid false positives within the
-# here-doc body, although the statement to which the here-doc is attached is
-# retained.
-#
-# Heuristics are used to detect end-of-subshell when the closing ")" is cuddled
-# with the final subshell statement on the same line:
-#
-#    (cd foo &&
-#        bar)
-#
-# in order to avoid misinterpreting the ")" in constructs such as "x=$(...)"
-# and "case $x in *)" as ending the subshell.
-#
-# Lines missing a final "&&" are flagged with "?!AMP?!", and lines which chain
-# commands with ";" internally rather than "&&" are flagged "?!SEMI?!". A line
-# may be flagged for both violations.
-#
-# Detection of a missing &&-link in a multi-line subshell is complicated by the
-# fact that the last statement before the closing ")" must not end with "&&".
-# Since processing is line-by-line, it is not known whether a missing "&&" is
-# legitimate or not until the _next_ line is seen. To accommodate this, within
-# multi-line subshells, each line is stored in sed's "hold" area until after
-# the next line is seen and processed. If the next line is a stand-alone ")",
-# then a missing "&&" on the previous line is legitimate; otherwise a missing
-# "&&" is a break in the &&-chain.
-#
-#    (
-#         cd foo &&
-#         bar
-#    )
-#
-# In practical terms, when "bar" is encountered, it is flagged with "?!AMP?!",
-# but when the stand-alone ")" line is seen which closes the subshell, the
-# "?!AMP?!" violation is removed from the "bar" line (retrieved from the "hold"
-# area) since the final statement of a subshell must not end with "&&". The
-# final line of a subshell may still break the &&-chain by using ";" internally
-# to chain commands together rather than "&&", so "?!SEMI?!" is never removed
-# from a line (even though "?!AMP?!" might be).
-#
-# Care is taken to recognize the last _statement_ of a multi-line subshell, not
-# necessarily the last textual _line_ within the subshell, since &&-chaining
-# applies to statements, not to lines. Consequently, blank lines, comment
-# lines, and here-docs are swallowed (but not the command to which the here-doc
-# is attached), leaving the last statement in the "hold" area, not the last
-# line, thus simplifying &&-link checking.
-#
-# The final statement before "done" in for- and while-loops, and before "elif",
-# "else", and "fi" in if-then-else likewise must not end with "&&", thus
-# receives similar treatment.
-#
-# Swallowing here-docs with arbitrary tags requires a bit of finesse. When a
-# line such as "cat <<EOF >out" is seen, the here-doc tag is moved to the front
-# of the line enclosed in angle brackets as a sentinel, giving "<EOF>cat >out".
-# As each subsequent line is read, it is appended to the target line and a
-# (whitespace-loose) back-reference match /^<(.*)>\n\1$/ is attempted to see if
-# the content inside "<...>" matches the entirety of the newly-read line. For
-# instance, if the next line read is "some data", when concatenated with the
-# target line, it becomes "<EOF>cat >out\nsome data", and a match is attempted
-# to see if "EOF" matches "some data". Since it doesn't, the next line is
-# attempted. When a line consisting of only "EOF" (and possible whitespace) is
-# encountered, it is appended to the target line giving "<EOF>cat >out\nEOF",
-# in which case the "EOF" inside "<...>" does match the text following the
-# newline, thus the closing here-doc tag has been found. The closing tag line
-# and the "<...>" prefix on the target line are then discarded, leaving just
-# the target line "cat >out".
-#
-# To facilitate regression testing (and manual debugging), a ">" annotation is
-# applied to the line containing ")" which closes a subshell, ">>" to a line
-# closing a nested subshell, and ">>>" to a line closing both at once. This
-# makes it easy to detect whether the heuristics correctly identify
-# end-of-subshell.
-#------------------------------------------------------------------------------
-
-# incomplete line -- slurp up next line
-:squash
-/\\$/ {
-	N
-	s/\\\n//
-	bsquash
-}
-
-# here-doc -- swallow it to avoid false hits within its body (but keep the
-# command to which it was attached)
-/<<[ 	]*[-\\'"]*[A-Za-z0-9_]/ {
-	s/^\(.*\)<<[ 	]*[-\\'"]*\([A-Za-z0-9_][A-Za-z0-9_]*\)['"]*/<\2>\1<</
-	s/[ 	]*<<//
-	:hered
-	N
-	/^<\([^>]*\)>.*\n[ 	]*\1[ 	]*$/!{
-		s/\n.*$//
-		bhered
-	}
-	s/^<[^>]*>//
-	s/\n.*$//
-}
-
-# one-liner "(...) &&"
-/^[ 	]*!*[ 	]*(..*)[ 	]*&&[ 	]*$/boneline
-
-# same as above but without trailing "&&"
-/^[ 	]*!*[ 	]*(..*)[ 	]*$/boneline
-
-# one-liner "(...) >x" (or "2>x" or "<x" or "|x" or "&"
-/^[ 	]*!*[ 	]*(..*)[ 	]*[0-9]*[<>|&]/boneline
-
-# multi-line "(...\n...)"
-/^[ 	]*(/bsubshell
-
-# innocuous line -- print it and advance to next line
-b
-
-# found one-liner "(...)" -- mark suspect if it uses ";" internally rather than
-# "&&" (but not ";" in a string)
-:oneline
-/;/{
-	/"[^"]*;[^"]*"/!s/^/?!SEMI?!/
-}
-b
-
-:subshell
-# bare "(" line? -- stash for later printing
-/^[ 	]*([	]*$/ {
-	h
-	bnextline
-}
-# "(..." line -- split off and stash "(", then process "..." as its own line
-x
-s/.*/(/
-x
-s/(//
-bslurp
-
-:nextline
-N
-s/.*\n//
-
-:slurp
-# incomplete line "...\"
-/\\$/bicmplte
-# multi-line quoted string "...\n..."?
-/"/bdqstring
-# multi-line quoted string '...\n...'? (but not contraction in string "it's")
-/'/{
-	/"[^'"]*'[^'"]*"/!bsqstring
-}
-:folded
-# here-doc -- swallow it
-/<<[ 	]*[-\\'"]*[A-Za-z0-9_]/bheredoc
-# comment or empty line -- discard since final non-comment, non-empty line
-# before closing ")", "done", "elsif", "else", or "fi" will need to be
-# re-visited to drop "suspect" marking since final line of those constructs
-# legitimately lacks "&&", so "suspect" mark must be removed
-/^[ 	]*#/bnextline
-/^[ 	]*$/bnextline
-# in-line comment -- strip it (but not "#" in a string, Bash ${#...} array
-# length, or Perforce "//depot/path#42" revision in filespec)
-/[ 	]#/{
-	/"[^"]*#[^"]*"/!s/[ 	]#.*$//
-}
-# one-liner "case ... esac"
-/^[ 	]*case[ 	]*..*esac/bchkchn
-# multi-line "case ... esac"
-/^[ 	]*case[ 	]..*[ 	]in/bcase
-# multi-line "for ... done" or "while ... done"
-/^[ 	]*for[ 	]..*[ 	]in/bcontinue
-/^[ 	]*while[ 	]/bcontinue
-/^[ 	]*do[ 	]/bcontinue
-/^[ 	]*do[ 	]*$/bcontinue
-/;[ 	]*do/bcontinue
-/^[ 	]*done[ 	]*&&[ 	]*$/bdone
-/^[ 	]*done[ 	]*$/bdone
-/^[ 	]*done[ 	]*[<>|]/bdone
-/^[ 	]*done[ 	]*)/bdone
-/||[ 	]*exit[ 	]/bcontinue
-/||[ 	]*exit[ 	]*$/bcontinue
-# multi-line "if...elsif...else...fi"
-/^[ 	]*if[ 	]/bcontinue
-/^[ 	]*then[ 	]/bcontinue
-/^[ 	]*then[ 	]*$/bcontinue
-/;[ 	]*then/bcontinue
-/^[ 	]*elif[ 	]/belse
-/^[ 	]*elif[ 	]*$/belse
-/^[ 	]*else[ 	]/belse
-/^[ 	]*else[ 	]*$/belse
-/^[ 	]*fi[ 	]*&&[ 	]*$/bdone
-/^[ 	]*fi[ 	]*$/bdone
-/^[ 	]*fi[ 	]*[<>|]/bdone
-/^[ 	]*fi[ 	]*)/bdone
-# nested one-liner "(...) &&"
-/^[ 	]*(.*)[ 	]*&&[ 	]*$/bchkchn
-# nested one-liner "(...)"
-/^[ 	]*(.*)[ 	]*$/bchkchn
-# nested one-liner "(...) >x" (or "2>x" or "<x" or "|x")
-/^[ 	]*(.*)[ 	]*[0-9]*[<>|]/bchkchn
-# nested multi-line "(...\n...)"
-/^[ 	]*(/bnest
-# multi-line "{...\n...}"
-/^[ 	]*{/bblock
-# closing ")" on own line -- exit subshell
-/^[ 	]*)/bclssolo
-# "$((...))" -- arithmetic expansion; not closing ")"
-/\$(([^)][^)]*))[^)]*$/bchkchn
-# "$(...)" -- command substitution; not closing ")"
-/\$([^)][^)]*)[^)]*$/bchkchn
-# multi-line "$(...\n...)" -- command substitution; treat as nested subshell
-/\$([^)]*$/bnest
-# "=(...)" -- Bash array assignment; not closing ")"
-/=(/bchkchn
-# closing "...) &&"
-/)[ 	]*&&[ 	]*$/bclose
-# closing "...)"
-/)[ 	]*$/bclose
-# closing "...) >x" (or "2>x" or "<x" or "|x")
-/)[ 	]*[<>|]/bclose
-:chkchn
-# mark suspect if line uses ";" internally rather than "&&" (but not ";" in a
-# string and not ";;" in one-liner "case...esac")
-/;/{
-	/;;/!{
-		/"[^"]*;[^"]*"/!s/^/?!SEMI?!/
-	}
-}
-# line ends with pipe "...|" -- valid; not missing "&&"
-/|[ 	]*$/bcontinue
-# missing end-of-line "&&" -- mark suspect
-/&&[ 	]*$/!s/^/?!AMP?!/
-:continue
-# retrieve and print previous line
-x
-n
-bslurp
-
-# found incomplete line "...\" -- slurp up next line
-:icmplte
-N
-s/\\\n//
-bslurp
-
-# check for multi-line double-quoted string "...\n..." -- fold to one line
-:dqstring
-# remove all quote pairs
-s/"\([^"]*\)"/@!\1@!/g
-# done if no dangling quote
-/"/!bdqdone
-# otherwise, slurp next line and try again
-N
-s/\n//
-bdqstring
-:dqdone
-s/@!/"/g
-bfolded
-
-# check for multi-line single-quoted string '...\n...' -- fold to one line
-:sqstring
-# remove all quote pairs
-s/'\([^']*\)'/@!\1@!/g
-# done if no dangling quote
-/'/!bsqdone
-# otherwise, slurp next line and try again
-N
-s/\n//
-bsqstring
-:sqdone
-s/@!/'/g
-bfolded
-
-# found here-doc -- swallow it to avoid false hits within its body (but keep
-# the command to which it was attached)
-:heredoc
-s/^\(.*\)<<[ 	]*[-\\'"]*\([A-Za-z0-9_][A-Za-z0-9_]*\)['"]*/<\2>\1<</
-s/[ 	]*<<//
-:heredsub
-N
-/^<\([^>]*\)>.*\n[ 	]*\1[ 	]*$/!{
-	s/\n.*$//
-	bheredsub
-}
-s/^<[^>]*>//
-s/\n.*$//
-bfolded
-
-# found "case ... in" -- pass through untouched
-:case
-x
-n
-/^[ 	]*esac/bslurp
-bcase
-
-# found "else" or "elif" -- drop "suspect" from final line before "else" since
-# that line legitimately lacks "&&"
-:else
-x
-s/?!AMP?!//
-x
-bcontinue
-
-# found "done" closing for-loop or while-loop, or "fi" closing if-then -- drop
-# "suspect" from final contained line since that line legitimately lacks "&&"
-:done
-x
-s/?!AMP?!//
-x
-# is 'done' or 'fi' cuddled with ")" to close subshell?
-/done.*)/bclose
-/fi.*)/bclose
-bchkchn
-
-# found nested multi-line "(...\n...)" -- pass through untouched
-:nest
-x
-:nstslurp
-n
-# closing ")" on own line -- stop nested slurp
-/^[ 	]*)/bnstclose
-# comment -- not closing ")" if in comment
-/^[ 	]*#/bnstcnt
-# "$((...))" -- arithmetic expansion; not closing ")"
-/\$(([^)][^)]*))[^)]*$/bnstcnt
-# "$(...)" -- command substitution; not closing ")"
-/\$([^)][^)]*)[^)]*$/bnstcnt
-# closing "...)" -- stop nested slurp
-/)/bnstclose
-:nstcnt
-x
-bnstslurp
-:nstclose
-s/^/>>/
-# is it "))" which closes nested and parent subshells?
-/)[ 	]*)/bslurp
-bchkchn
-
-# found multi-line "{...\n...}" block -- pass through untouched
-:block
-x
-n
-# closing "}" -- stop block slurp
-/}/bchkchn
-bblock
-
-# found closing ")" on own line -- drop "suspect" from final line of subshell
-# since that line legitimately lacks "&&" and exit subshell loop
-:clssolo
-x
-s/?!AMP?!//
-p
-x
-s/^/>/
-b
-
-# found closing "...)" -- exit subshell loop
-:close
-x
-p
-x
-s/^/>/
-b
diff --git a/t/chainlint/arithmetic-expansion.expect b/t/chainlint/arithmetic-expansion.expect
index 09457d3..46ee104 100644
--- a/t/chainlint/arithmetic-expansion.expect
+++ b/t/chainlint/arithmetic-expansion.expect
@@ -2,8 +2,8 @@
 	foo &&
 	bar=$((42 + 1)) &&
 	baz
->) &&
+) &&
 (
-?!AMP?!	bar=$((42 + 1))
+	bar=$((42 + 1)) ?!AMP?!
 	baz
->)
+)
diff --git a/t/chainlint/bash-array.expect b/t/chainlint/bash-array.expect
index c4a830d..4c34eae 100644
--- a/t/chainlint/bash-array.expect
+++ b/t/chainlint/bash-array.expect
@@ -2,9 +2,9 @@
 	foo &&
 	bar=(gumbo stumbo wumbo) &&
 	baz
->) &&
+) &&
 (
 	foo &&
 	bar=${#bar[@]} &&
 	baz
->)
+)
diff --git a/t/chainlint/blank-line-before-esac.expect b/t/chainlint/blank-line-before-esac.expect
new file mode 100644
index 0000000..056e030
--- /dev/null
+++ b/t/chainlint/blank-line-before-esac.expect
@@ -0,0 +1,18 @@
+test_done () {
+	case "$test_failure" in
+	0)
+		test_at_end_hook_
+
+		exit 0 ;;
+
+	*)
+		if test $test_external_has_tap -eq 0
+		then
+			say_color error "# failed $test_failure among $msg"
+			say "1..$test_count"
+		fi
+
+		exit 1 ;;
+
+	esac
+}
diff --git a/t/chainlint/blank-line-before-esac.test b/t/chainlint/blank-line-before-esac.test
new file mode 100644
index 0000000..cecccad
--- /dev/null
+++ b/t/chainlint/blank-line-before-esac.test
@@ -0,0 +1,19 @@
+# LINT: blank line before "esac"
+test_done () {
+	case "$test_failure" in
+	0)
+		test_at_end_hook_
+
+		exit 0 ;;
+
+	*)
+		if test $test_external_has_tap -eq 0
+		then
+			say_color error "# failed $test_failure among $msg"
+			say "1..$test_count"
+		fi
+
+		exit 1 ;;
+
+	esac
+}
diff --git a/t/chainlint/blank-line.expect b/t/chainlint/blank-line.expect
index 3be939e..b47827d 100644
--- a/t/chainlint/blank-line.expect
+++ b/t/chainlint/blank-line.expect
@@ -1,4 +1,8 @@
 (
+
 	nothing &&
+
 	something
->)
+
+
+)
diff --git a/t/chainlint/blank-line.test b/t/chainlint/blank-line.test
index f6dd143..0fdf15b 100644
--- a/t/chainlint/blank-line.test
+++ b/t/chainlint/blank-line.test
@@ -3,7 +3,7 @@
 	nothing &&
 
 	something
-# LINT: swallow blank lines since final _statement_ before subshell end is
+# LINT: ignore blank lines since final _statement_ before subshell end is
 # LINT: significant to "&&"-check, not final _line_ (which might be blank)
 
 
diff --git a/t/chainlint/block-comment.expect b/t/chainlint/block-comment.expect
new file mode 100644
index 0000000..df2beea
--- /dev/null
+++ b/t/chainlint/block-comment.expect
@@ -0,0 +1,8 @@
+(
+	{
+		# show a
+		echo a &&
+		# show b
+		echo b
+	}
+)
diff --git a/t/chainlint/block-comment.test b/t/chainlint/block-comment.test
new file mode 100644
index 0000000..df2beea
--- /dev/null
+++ b/t/chainlint/block-comment.test
@@ -0,0 +1,8 @@
+(
+	{
+		# show a
+		echo a &&
+		# show b
+		echo b
+	}
+)
diff --git a/t/chainlint/block.expect b/t/chainlint/block.expect
index fed7e89..1c87326 100644
--- a/t/chainlint/block.expect
+++ b/t/chainlint/block.expect
@@ -1,12 +1,23 @@
 (
 	foo &&
 	{
-		echo a
+		echo a ?!AMP?!
 		echo b
 	} &&
 	bar &&
 	{
 		echo c
-?!AMP?!	}
+	} ?!AMP?!
 	baz
->)
+) &&
+
+{
+	echo a; ?!AMP?! echo b
+} &&
+{ echo a; ?!AMP?! echo b; } &&
+
+{
+	echo "${var}9" &&
+	echo "done"
+} &&
+finis
diff --git a/t/chainlint/block.test b/t/chainlint/block.test
index d859151..4ab69a4 100644
--- a/t/chainlint/block.test
+++ b/t/chainlint/block.test
@@ -1,6 +1,5 @@
 (
-# LINT: missing "&&" in block not currently detected (for consistency with
-# LINT: --chain-lint at top level and to provide escape hatch if needed)
+# LINT: missing "&&" after first "echo"
 	foo &&
 	{
 		echo a
@@ -12,4 +11,17 @@
 		echo c
 	}
 	baz
-)
+) &&
+
+# LINT: ";" not allowed in place of "&&"
+{
+	echo a; echo b
+} &&
+{ echo a; echo b; } &&
+
+# LINT: "}" inside string not mistaken as end of block
+{
+	echo "${var}9" &&
+	echo "done"
+} &&
+finis
diff --git a/t/chainlint/broken-chain.expect b/t/chainlint/broken-chain.expect
index 55b0f42..cfb58fb 100644
--- a/t/chainlint/broken-chain.expect
+++ b/t/chainlint/broken-chain.expect
@@ -1,6 +1,6 @@
 (
 	foo &&
-?!AMP?!	bar
+	bar ?!AMP?!
 	baz &&
 	wop
->)
+)
diff --git a/t/chainlint/broken-chain.test b/t/chainlint/broken-chain.test
index 3cc67b6..2a44aa7 100644
--- a/t/chainlint/broken-chain.test
+++ b/t/chainlint/broken-chain.test
@@ -1,6 +1,6 @@
 (
 	foo &&
-# LINT: missing "&&" from 'bar'
+# LINT: missing "&&" from "bar"
 	bar
 	baz &&
 # LINT: final statement before closing ")" legitimately lacks "&&"
diff --git a/t/chainlint/case-comment.expect b/t/chainlint/case-comment.expect
new file mode 100644
index 0000000..641c157
--- /dev/null
+++ b/t/chainlint/case-comment.expect
@@ -0,0 +1,11 @@
+(
+	case "$x" in
+	# found foo
+	x) foo ;;
+	# found other
+	*)
+		# treat it as bar
+		bar
+		;;
+	esac
+)
diff --git a/t/chainlint/case-comment.test b/t/chainlint/case-comment.test
new file mode 100644
index 0000000..641c157
--- /dev/null
+++ b/t/chainlint/case-comment.test
@@ -0,0 +1,11 @@
+(
+	case "$x" in
+	# found foo
+	x) foo ;;
+	# found other
+	*)
+		# treat it as bar
+		bar
+		;;
+	esac
+)
diff --git a/t/chainlint/case.expect b/t/chainlint/case.expect
index 41f121f..31f280d 100644
--- a/t/chainlint/case.expect
+++ b/t/chainlint/case.expect
@@ -4,16 +4,16 @@
 	*) bar ;;
 	esac &&
 	foobar
->) &&
+) &&
 (
 	case "$x" in
 	x) foo ;;
 	*) bar ;;
-?!AMP?!	esac
+	esac ?!AMP?!
 	foobar
->) &&
+) &&
 (
 	case "$x" in 1) true;; esac &&
-?!AMP?!	case "$y" in 2) false;; esac
+	case "$y" in 2) false;; esac ?!AMP?!
 	foobar
->)
+)
diff --git a/t/chainlint/case.test b/t/chainlint/case.test
index 5ef6ff7..4cb086b 100644
--- a/t/chainlint/case.test
+++ b/t/chainlint/case.test
@@ -1,5 +1,5 @@
 (
-# LINT: "...)" arms in 'case' not misinterpreted as subshell-closing ")"
+# LINT: "...)" arms in "case" not misinterpreted as subshell-closing ")"
 	case "$x" in
 	x) foo ;;
 	*) bar ;;
@@ -7,7 +7,7 @@
 	foobar
 ) &&
 (
-# LINT: missing "&&" on 'esac'
+# LINT: missing "&&" on "esac"
 	case "$x" in
 	x) foo ;;
 	*) bar ;;
@@ -15,7 +15,7 @@
 	foobar
 ) &&
 (
-# LINT: "...)" arm in one-liner 'case' not misinterpreted as closing ")"
+# LINT: "...)" arm in one-liner "case" not misinterpreted as closing ")"
 	case "$x" in 1) true;; esac &&
 # LINT: same but missing "&&"
 	case "$y" in 2) false;; esac
diff --git a/t/chainlint/chain-break-background.expect b/t/chainlint/chain-break-background.expect
new file mode 100644
index 0000000..20d0bb5
--- /dev/null
+++ b/t/chainlint/chain-break-background.expect
@@ -0,0 +1,9 @@
+JGIT_DAEMON_PID= &&
+git init --bare empty.git &&
+>empty.git/git-daemon-export-ok &&
+mkfifo jgit_daemon_output &&
+{
+	jgit daemon --port="$JGIT_DAEMON_PORT" . >jgit_daemon_output &
+	JGIT_DAEMON_PID=$!
+} &&
+test_expect_code 2 git ls-remote --exit-code git://localhost:$JGIT_DAEMON_PORT/empty.git
diff --git a/t/chainlint/chain-break-background.test b/t/chainlint/chain-break-background.test
new file mode 100644
index 0000000..e10f656
--- /dev/null
+++ b/t/chainlint/chain-break-background.test
@@ -0,0 +1,10 @@
+JGIT_DAEMON_PID= &&
+git init --bare empty.git &&
+>empty.git/git-daemon-export-ok &&
+mkfifo jgit_daemon_output &&
+{
+# LINT: exit status of "&" is always 0 so &&-chaining immaterial
+	jgit daemon --port="$JGIT_DAEMON_PORT" . >jgit_daemon_output &
+	JGIT_DAEMON_PID=$!
+} &&
+test_expect_code 2 git ls-remote --exit-code git://localhost:$JGIT_DAEMON_PORT/empty.git
diff --git a/t/chainlint/chain-break-continue.expect b/t/chainlint/chain-break-continue.expect
new file mode 100644
index 0000000..47a3457
--- /dev/null
+++ b/t/chainlint/chain-break-continue.expect
@@ -0,0 +1,12 @@
+git ls-tree --name-only -r refs/notes/many_notes |
+while read path
+do
+	test "$path" = "foobar/non-note.txt" && continue
+	test "$path" = "deadbeef" && continue
+	test "$path" = "de/adbeef" && continue
+
+	if test $(expr length "$path") -ne $hexsz
+	then
+		return 1
+	fi
+done
diff --git a/t/chainlint/chain-break-continue.test b/t/chainlint/chain-break-continue.test
new file mode 100644
index 0000000..f0af71d
--- /dev/null
+++ b/t/chainlint/chain-break-continue.test
@@ -0,0 +1,13 @@
+git ls-tree --name-only -r refs/notes/many_notes |
+while read path
+do
+# LINT: broken &&-chain okay if explicit "continue"
+	test "$path" = "foobar/non-note.txt" && continue
+	test "$path" = "deadbeef" && continue
+	test "$path" = "de/adbeef" && continue
+
+	if test $(expr length "$path") -ne $hexsz
+	then
+		return 1
+	fi
+done
diff --git a/t/chainlint/chain-break-false.expect b/t/chainlint/chain-break-false.expect
new file mode 100644
index 0000000..989766f
--- /dev/null
+++ b/t/chainlint/chain-break-false.expect
@@ -0,0 +1,9 @@
+if condition not satisified
+then
+	echo it did not work...
+	echo failed!
+	false
+else
+	echo it went okay ?!AMP?!
+	congratulate user
+fi
diff --git a/t/chainlint/chain-break-false.test b/t/chainlint/chain-break-false.test
new file mode 100644
index 0000000..a5aaff8
--- /dev/null
+++ b/t/chainlint/chain-break-false.test
@@ -0,0 +1,10 @@
+# LINT: broken &&-chain okay if explicit "false" signals failure
+if condition not satisified
+then
+	echo it did not work...
+	echo failed!
+	false
+else
+	echo it went okay
+	congratulate user
+fi
diff --git a/t/chainlint/chain-break-return-exit.expect b/t/chainlint/chain-break-return-exit.expect
new file mode 100644
index 0000000..4cd18e2
--- /dev/null
+++ b/t/chainlint/chain-break-return-exit.expect
@@ -0,0 +1,19 @@
+case "$(git ls-files)" in
+one) echo pass one ;;
+*) echo bad one; return 1 ;;
+esac &&
+(
+	case "$(git ls-files)" in
+	two) echo pass two ;;
+	*) echo bad two; exit 1 ;;
+	esac
+) &&
+case "$(git ls-files)" in
+dir/two"$LF"one) echo pass both ;;
+*) echo bad; return 1 ;;
+esac &&
+
+for i in 1 2 3 4 ; do
+	git checkout main -b $i || return $?
+	test_commit $i $i $i tag$i || return $?
+done
diff --git a/t/chainlint/chain-break-return-exit.test b/t/chainlint/chain-break-return-exit.test
new file mode 100644
index 0000000..46542ed
--- /dev/null
+++ b/t/chainlint/chain-break-return-exit.test
@@ -0,0 +1,23 @@
+case "$(git ls-files)" in
+one) echo pass one ;;
+# LINT: broken &&-chain okay if explicit "return 1" signals failuire
+*) echo bad one; return 1 ;;
+esac &&
+(
+	case "$(git ls-files)" in
+	two) echo pass two ;;
+# LINT: broken &&-chain okay if explicit "exit 1" signals failuire
+	*) echo bad two; exit 1 ;;
+	esac
+) &&
+case "$(git ls-files)" in
+dir/two"$LF"one) echo pass both ;;
+# LINT: broken &&-chain okay if explicit "return 1" signals failuire
+*) echo bad; return 1 ;;
+esac &&
+
+for i in 1 2 3 4 ; do
+# LINT: broken &&-chain okay if explicit "return $?" signals failure
+	git checkout main -b $i || return $?
+	test_commit $i $i $i tag$i || return $?
+done
diff --git a/t/chainlint/chain-break-status.expect b/t/chainlint/chain-break-status.expect
new file mode 100644
index 0000000..e6b3b21
--- /dev/null
+++ b/t/chainlint/chain-break-status.expect
@@ -0,0 +1,9 @@
+OUT=$( ((large_git; echo $? 1>&3) | :) 3>&1 ) &&
+test_match_signal 13 "$OUT" &&
+
+{ test-tool sigchain >actual; ret=$?; } &&
+{
+	test_match_signal 15 "$ret" ||
+	test "$ret" = 3
+} &&
+test_cmp expect actual
diff --git a/t/chainlint/chain-break-status.test b/t/chainlint/chain-break-status.test
new file mode 100644
index 0000000..a6602a7
--- /dev/null
+++ b/t/chainlint/chain-break-status.test
@@ -0,0 +1,11 @@
+# LINT: broken &&-chain okay if next command handles "$?" explicitly
+OUT=$( ((large_git; echo $? 1>&3) | :) 3>&1 ) &&
+test_match_signal 13 "$OUT" &&
+
+# LINT: broken &&-chain okay if next command handles "$?" explicitly
+{ test-tool sigchain >actual; ret=$?; } &&
+{
+	test_match_signal 15 "$ret" ||
+	test "$ret" = 3
+} &&
+test_cmp expect actual
diff --git a/t/chainlint/chained-block.expect b/t/chainlint/chained-block.expect
new file mode 100644
index 0000000..574cdce
--- /dev/null
+++ b/t/chainlint/chained-block.expect
@@ -0,0 +1,9 @@
+echo nobody home && {
+	test the doohicky ?!AMP?!
+	right now
+} &&
+
+GIT_EXTERNAL_DIFF=echo git diff | {
+	read path oldfile oldhex oldmode newfile newhex newmode &&
+	test "z$oh" = "z$oldhex"
+}
diff --git a/t/chainlint/chained-block.test b/t/chainlint/chained-block.test
new file mode 100644
index 0000000..86f81ec
--- /dev/null
+++ b/t/chainlint/chained-block.test
@@ -0,0 +1,11 @@
+# LINT: start of block chained to preceding command
+echo nobody home && {
+	test the doohicky
+	right now
+} &&
+
+# LINT: preceding command pipes to block on same line
+GIT_EXTERNAL_DIFF=echo git diff | {
+	read path oldfile oldhex oldmode newfile newhex newmode &&
+	test "z$oh" = "z$oldhex"
+}
diff --git a/t/chainlint/chained-subshell.expect b/t/chainlint/chained-subshell.expect
new file mode 100644
index 0000000..83810ea
--- /dev/null
+++ b/t/chainlint/chained-subshell.expect
@@ -0,0 +1,10 @@
+mkdir sub && (
+	cd sub &&
+	foo the bar ?!AMP?!
+	nuff said
+) &&
+
+cut "-d " -f actual | (read s1 s2 s3 &&
+test -f $s1 ?!AMP?!
+test $(cat $s2) = tree2path1 &&
+test $(cat $s3) = tree3path1)
diff --git a/t/chainlint/chained-subshell.test b/t/chainlint/chained-subshell.test
new file mode 100644
index 0000000..4ff6ddd
--- /dev/null
+++ b/t/chainlint/chained-subshell.test
@@ -0,0 +1,13 @@
+# LINT: start of subshell chained to preceding command
+mkdir sub && (
+	cd sub &&
+	foo the bar
+	nuff said
+) &&
+
+# LINT: preceding command pipes to subshell on same line
+cut "-d " -f actual | (read s1 s2 s3 &&
+test -f $s1
+test $(cat $s2) = tree2path1 &&
+# LINT: closing subshell ")" correctly detected on same line as "$(...)"
+test $(cat $s3) = tree3path1)
diff --git a/t/chainlint/close-nested-and-parent-together.expect b/t/chainlint/close-nested-and-parent-together.expect
index 2a910f9..72d482f 100644
--- a/t/chainlint/close-nested-and-parent-together.expect
+++ b/t/chainlint/close-nested-and-parent-together.expect
@@ -1,4 +1,3 @@
-(
-cd foo &&
+(cd foo &&
 	(bar &&
->>>		baz))
+		baz))
diff --git a/t/chainlint/close-subshell.expect b/t/chainlint/close-subshell.expect
index 1846887..2192a28 100644
--- a/t/chainlint/close-subshell.expect
+++ b/t/chainlint/close-subshell.expect
@@ -1,25 +1,26 @@
 (
 	foo
->) &&
+) &&
 (
 	bar
->) >out &&
+) >out &&
 (
 	baz
->) 2>err &&
+) 2>err &&
 (
 	boo
->) <input &&
+) <input &&
 (
 	bip
->) | wuzzle &&
+) | wuzzle &&
 (
 	bop
->) | fazz 	fozz &&
+) | fazz \
+	fozz &&
 (
 	bup
->) |
+) |
 fuzzle &&
 (
 	yop
->)
+)
diff --git a/t/chainlint/command-substitution-subsubshell.expect b/t/chainlint/command-substitution-subsubshell.expect
new file mode 100644
index 0000000..ec42f2c
--- /dev/null
+++ b/t/chainlint/command-substitution-subsubshell.expect
@@ -0,0 +1,2 @@
+OUT=$( ((large_git 1>&3) | :) 3>&1 ) &&
+test_match_signal 13 "$OUT"
diff --git a/t/chainlint/command-substitution-subsubshell.test b/t/chainlint/command-substitution-subsubshell.test
new file mode 100644
index 0000000..321de29
--- /dev/null
+++ b/t/chainlint/command-substitution-subsubshell.test
@@ -0,0 +1,3 @@
+# LINT: subshell nested in subshell nested in command substitution
+OUT=$( ((large_git 1>&3) | :) 3>&1 ) &&
+test_match_signal 13 "$OUT"
diff --git a/t/chainlint/command-substitution.expect b/t/chainlint/command-substitution.expect
index ad4118e..c72e4df 100644
--- a/t/chainlint/command-substitution.expect
+++ b/t/chainlint/command-substitution.expect
@@ -2,8 +2,8 @@
 	foo &&
 	bar=$(gobble) &&
 	baz
->) &&
+) &&
 (
-?!AMP?!	bar=$(gobble blocks)
+	bar=$(gobble blocks) ?!AMP?!
 	baz
->)
+)
diff --git a/t/chainlint/comment.expect b/t/chainlint/comment.expect
index 3be939e..a68f1f9 100644
--- a/t/chainlint/comment.expect
+++ b/t/chainlint/comment.expect
@@ -1,4 +1,8 @@
 (
+	# comment 1
 	nothing &&
+	# comment 2
 	something
->)
+	# comment 3
+	# comment 4
+)
diff --git a/t/chainlint/complex-if-in-cuddled-loop.expect b/t/chainlint/complex-if-in-cuddled-loop.expect
index 9674b88..dac2d0f 100644
--- a/t/chainlint/complex-if-in-cuddled-loop.expect
+++ b/t/chainlint/complex-if-in-cuddled-loop.expect
@@ -1,10 +1,9 @@
-(
-for i in a b c; do
+(for i in a b c; do
    if test "$(echo $(waffle bat))" = "eleventeen" &&
      test "$x" = "$y"; then
      :
    else
      echo >file
-   fi
-> done) &&
+   fi ?!LOOP?!
+ done) &&
 test ! -f file
diff --git a/t/chainlint/complex-if-in-cuddled-loop.test b/t/chainlint/complex-if-in-cuddled-loop.test
index 571bbd8..5efeda5 100644
--- a/t/chainlint/complex-if-in-cuddled-loop.test
+++ b/t/chainlint/complex-if-in-cuddled-loop.test
@@ -1,4 +1,4 @@
-# LINT: 'for' loop cuddled with "(" and ")" and nested 'if' with complex
+# LINT: "for" loop cuddled with "(" and ")" and nested "if" with complex
 # LINT: multi-line condition; indented with spaces, not tabs
 (for i in a b c; do
    if test "$(echo $(waffle bat))" = "eleventeen" &&
diff --git a/t/chainlint/cuddled-if-then-else.expect b/t/chainlint/cuddled-if-then-else.expect
index ab2a026..1d8ed58 100644
--- a/t/chainlint/cuddled-if-then-else.expect
+++ b/t/chainlint/cuddled-if-then-else.expect
@@ -1,7 +1,6 @@
-(
-if test -z ""; then
+(if test -z ""; then
     echo empty
  else
     echo bizzy
-> fi) &&
+ fi) &&
 echo foobar
diff --git a/t/chainlint/cuddled-if-then-else.test b/t/chainlint/cuddled-if-then-else.test
index eed774a..7c53f4e 100644
--- a/t/chainlint/cuddled-if-then-else.test
+++ b/t/chainlint/cuddled-if-then-else.test
@@ -1,4 +1,4 @@
-# LINT: 'if' cuddled with "(" and ")"; indented with spaces, not tabs
+# LINT: "if" cuddled with "(" and ")"; indented with spaces, not tabs
 (if test -z ""; then
     echo empty
  else
diff --git a/t/chainlint/cuddled-loop.expect b/t/chainlint/cuddled-loop.expect
index 8c0260d..9cf2607 100644
--- a/t/chainlint/cuddled-loop.expect
+++ b/t/chainlint/cuddled-loop.expect
@@ -1,5 +1,4 @@
-(
- while read x
+( while read x
   do foobar bop || exit 1
->  done <file ) &&
+  done <file ) &&
 outside subshell
diff --git a/t/chainlint/cuddled-loop.test b/t/chainlint/cuddled-loop.test
index a841d78..3c2a62f 100644
--- a/t/chainlint/cuddled-loop.test
+++ b/t/chainlint/cuddled-loop.test
@@ -1,4 +1,4 @@
-# LINT: 'while' loop cuddled with "(" and ")", with embedded (allowed)
+# LINT: "while" loop cuddled with "(" and ")", with embedded (allowed)
 # LINT: "|| exit {n}" to exit loop early, and using redirection "<" to feed
 # LINT: loop; indented with spaces, not tabs
 ( while read x
diff --git a/t/chainlint/cuddled.expect b/t/chainlint/cuddled.expect
index b506d46..c3e0be4 100644
--- a/t/chainlint/cuddled.expect
+++ b/t/chainlint/cuddled.expect
@@ -1,21 +1,17 @@
-(
-cd foo &&
+(cd foo &&
 	bar
->) &&
+) &&
 
-(
-?!AMP?!cd foo
+(cd foo ?!AMP?!
 	bar
->) &&
+) &&
 
 (
 	cd foo &&
->	bar) &&
+	bar) &&
 
-(
-cd foo &&
->	bar) &&
+(cd foo &&
+	bar) &&
 
-(
-?!AMP?!cd foo
->	bar)
+(cd foo ?!AMP?!
+	bar)
diff --git a/t/chainlint/cuddled.test b/t/chainlint/cuddled.test
index 0499fa4..257b5b5 100644
--- a/t/chainlint/cuddled.test
+++ b/t/chainlint/cuddled.test
@@ -1,5 +1,4 @@
-# LINT: first subshell statement cuddled with opening "("; for implementation
-# LINT: simplicity, "(..." is split into two lines, "(" and "..."
+# LINT: first subshell statement cuddled with opening "("
 (cd foo &&
 	bar
 ) &&
diff --git a/t/chainlint/double-here-doc.expect b/t/chainlint/double-here-doc.expect
new file mode 100644
index 0000000..cd584a4
--- /dev/null
+++ b/t/chainlint/double-here-doc.expect
@@ -0,0 +1,12 @@
+run_sub_test_lib_test_err run-inv-range-start \
+	"--run invalid range start" \
+	--run="a-5" <<-\EOF &&
+test_expect_success "passing test #1" "true"
+test_done
+EOF
+check_sub_test_lib_test_err run-inv-range-start \
+	<<-\EOF_OUT 3<<-EOF_ERR
+> FATAL: Unexpected exit with code 1
+EOF_OUT
+> error: --run: invalid non-numeric in range start: ${SQ}a-5${SQ}
+EOF_ERR
diff --git a/t/chainlint/double-here-doc.test b/t/chainlint/double-here-doc.test
new file mode 100644
index 0000000..cd584a4
--- /dev/null
+++ b/t/chainlint/double-here-doc.test
@@ -0,0 +1,12 @@
+run_sub_test_lib_test_err run-inv-range-start \
+	"--run invalid range start" \
+	--run="a-5" <<-\EOF &&
+test_expect_success "passing test #1" "true"
+test_done
+EOF
+check_sub_test_lib_test_err run-inv-range-start \
+	<<-\EOF_OUT 3<<-EOF_ERR
+> FATAL: Unexpected exit with code 1
+EOF_OUT
+> error: --run: invalid non-numeric in range start: ${SQ}a-5${SQ}
+EOF_ERR
diff --git a/t/chainlint/dqstring-line-splice.expect b/t/chainlint/dqstring-line-splice.expect
new file mode 100644
index 0000000..37eab80
--- /dev/null
+++ b/t/chainlint/dqstring-line-splice.expect
@@ -0,0 +1,5 @@
+
+echo 'fatal: reword option of --fixup is mutually exclusive with'	'--patch/--interactive/--all/--include/--only' >expect &&
+test_must_fail git commit --fixup=reword:HEAD~ $1 2>actual &&
+test_cmp expect actual
+
diff --git a/t/chainlint/dqstring-line-splice.test b/t/chainlint/dqstring-line-splice.test
new file mode 100644
index 0000000..b407144
--- /dev/null
+++ b/t/chainlint/dqstring-line-splice.test
@@ -0,0 +1,7 @@
+# LINT: line-splice within DQ-string
+'"
+echo 'fatal: reword option of --fixup is mutually exclusive with'\
+	'--patch/--interactive/--all/--include/--only' >expect &&
+test_must_fail git commit --fixup=reword:HEAD~ $1 2>actual &&
+test_cmp expect actual
+"'
diff --git a/t/chainlint/dqstring-no-interpolate.expect b/t/chainlint/dqstring-no-interpolate.expect
new file mode 100644
index 0000000..087eda1
--- /dev/null
+++ b/t/chainlint/dqstring-no-interpolate.expect
@@ -0,0 +1,12 @@
+grep "^ ! [rejected][ ]*$BRANCH -> $BRANCH (non-fast-forward)$" out &&
+
+grep "^\.git$" output.txt &&
+
+
+(
+	cd client$version &&
+	GIT_TEST_PROTOCOL_VERSION=$version git fetch-pack --no-progress .. $(cat ../input)
+) >output &&
+	cut -d ' ' -f 2 <output | sort >actual &&
+	test_cmp expect actual
+
diff --git a/t/chainlint/dqstring-no-interpolate.test b/t/chainlint/dqstring-no-interpolate.test
new file mode 100644
index 0000000..d2f4219
--- /dev/null
+++ b/t/chainlint/dqstring-no-interpolate.test
@@ -0,0 +1,15 @@
+# LINT: regex dollar-sign eol anchor in double-quoted string not special
+grep "^ ! \[rejected\][ ]*$BRANCH -> $BRANCH (non-fast-forward)$" out &&
+
+# LINT: escaped "$" not mistaken for variable expansion
+grep "^\\.git\$" output.txt &&
+
+'"
+(
+	cd client$version &&
+# LINT: escaped dollar-sign in double-quoted test body
+	GIT_TEST_PROTOCOL_VERSION=$version git fetch-pack --no-progress .. \$(cat ../input)
+) >output &&
+	cut -d ' ' -f 2 <output | sort >actual &&
+	test_cmp expect actual
+"'
diff --git a/t/chainlint/empty-here-doc.expect b/t/chainlint/empty-here-doc.expect
new file mode 100644
index 0000000..8507721
--- /dev/null
+++ b/t/chainlint/empty-here-doc.expect
@@ -0,0 +1,4 @@
+git ls-tree $tree path >current &&
+cat >expected <<\EOF &&
+EOF
+test_output
diff --git a/t/chainlint/empty-here-doc.test b/t/chainlint/empty-here-doc.test
new file mode 100644
index 0000000..24fc165
--- /dev/null
+++ b/t/chainlint/empty-here-doc.test
@@ -0,0 +1,5 @@
+git ls-tree $tree path >current &&
+# LINT: empty here-doc
+cat >expected <<\EOF &&
+EOF
+test_output
diff --git a/t/chainlint/exclamation.expect b/t/chainlint/exclamation.expect
new file mode 100644
index 0000000..765a35b
--- /dev/null
+++ b/t/chainlint/exclamation.expect
@@ -0,0 +1,4 @@
+if ! condition; then echo nope; else yep; fi &&
+test_prerequisite !MINGW &&
+mail uucp!address &&
+echo !whatever!
diff --git a/t/chainlint/exclamation.test b/t/chainlint/exclamation.test
new file mode 100644
index 0000000..323595b
--- /dev/null
+++ b/t/chainlint/exclamation.test
@@ -0,0 +1,8 @@
+# LINT: "! word" is two tokens
+if ! condition; then echo nope; else yep; fi &&
+# LINT: "!word" is single token, not two tokens "!" and "word"
+test_prerequisite !MINGW &&
+# LINT: "word!word" is single token, not three tokens "word", "!", and "word"
+mail uucp!address &&
+# LINT: "!word!" is single token, not three tokens "!", "word", and "!"
+echo !whatever!
diff --git a/t/chainlint/exit-loop.expect b/t/chainlint/exit-loop.expect
index 84d8bde..f76aa60 100644
--- a/t/chainlint/exit-loop.expect
+++ b/t/chainlint/exit-loop.expect
@@ -5,7 +5,7 @@
 		bar &&
 		baz
 	done
->) &&
+) &&
 (
 	while true
 	do
@@ -13,7 +13,7 @@
 		bar &&
 		baz
 	done
->) &&
+) &&
 (
 	i=0 &&
 	while test $i -lt 10
@@ -21,4 +21,4 @@
 		echo $i || exit
 		i=$(($i + 1))
 	done
->)
+)
diff --git a/t/chainlint/exit-subshell.expect b/t/chainlint/exit-subshell.expect
index bf78454..da80339 100644
--- a/t/chainlint/exit-subshell.expect
+++ b/t/chainlint/exit-subshell.expect
@@ -2,4 +2,4 @@
 	foo || exit 1
 	bar &&
 	baz
->)
+)
diff --git a/t/chainlint/for-loop-abbreviated.expect b/t/chainlint/for-loop-abbreviated.expect
new file mode 100644
index 0000000..02c0d15
--- /dev/null
+++ b/t/chainlint/for-loop-abbreviated.expect
@@ -0,0 +1,5 @@
+for it
+do
+	path=$(expr "$it" : ([^:]*)) &&
+	git update-index --add "$path" || exit
+done
diff --git a/t/chainlint/for-loop-abbreviated.test b/t/chainlint/for-loop-abbreviated.test
new file mode 100644
index 0000000..1084ecc
--- /dev/null
+++ b/t/chainlint/for-loop-abbreviated.test
@@ -0,0 +1,6 @@
+# LINT: for-loop lacking optional "in [word...]" before "do"
+for it
+do
+	path=$(expr "$it" : '\([^:]*\)') &&
+	git update-index --add "$path" || exit
+done
diff --git a/t/chainlint/for-loop.expect b/t/chainlint/for-loop.expect
index c33cf56..d2237f1 100644
--- a/t/chainlint/for-loop.expect
+++ b/t/chainlint/for-loop.expect
@@ -1,11 +1,14 @@
 (
 	for i in a b c
 	do
-?!AMP?!		echo $i
-		cat
-?!AMP?!	done
+		echo $i ?!AMP?!
+		cat <<-\EOF ?!LOOP?!
+		bar
+		EOF
+	done ?!AMP?!
+
 	for i in a b c; do
 		echo $i &&
-		cat $i
+		cat $i ?!LOOP?!
 	done
->)
+)
diff --git a/t/chainlint/for-loop.test b/t/chainlint/for-loop.test
index 7db7626..6cb3428 100644
--- a/t/chainlint/for-loop.test
+++ b/t/chainlint/for-loop.test
@@ -1,17 +1,17 @@
 (
-# LINT: 'for', 'do', 'done' do not need "&&"
+# LINT: "for", "do", "done" do not need "&&"
 	for i in a b c
 	do
-# LINT: missing "&&" on 'echo'
+# LINT: missing "&&" on "echo"
 		echo $i
 # LINT: last statement of while does not need "&&"
 		cat <<-\EOF
 		bar
 		EOF
-# LINT: missing "&&" on 'done'
+# LINT: missing "&&" on "done"
 	done
 
-# LINT: 'do' on same line as 'for'
+# LINT: "do" on same line as "for"
 	for i in a b c; do
 		echo $i &&
 		cat $i
diff --git a/t/chainlint/function.expect b/t/chainlint/function.expect
new file mode 100644
index 0000000..dd7c997
--- /dev/null
+++ b/t/chainlint/function.expect
@@ -0,0 +1,11 @@
+sha1_file() {
+	echo "$*" | sed "s#..#.git/objects/&/#"
+} &&
+
+remove_object() {
+	file=$(sha1_file "$*") &&
+	test -e "$file" ?!AMP?!
+	rm -f "$file"
+} ?!AMP?!
+
+sha1_file arg && remove_object arg
diff --git a/t/chainlint/function.test b/t/chainlint/function.test
new file mode 100644
index 0000000..5ee5956
--- /dev/null
+++ b/t/chainlint/function.test
@@ -0,0 +1,13 @@
+# LINT: "()" in function definition not mistaken for subshell
+sha1_file() {
+	echo "$*" | sed "s#..#.git/objects/&/#"
+} &&
+
+# LINT: broken &&-chain in function and after function
+remove_object() {
+	file=$(sha1_file "$*") &&
+	test -e "$file"
+	rm -f "$file"
+}
+
+sha1_file arg && remove_object arg
diff --git a/t/chainlint/here-doc-close-subshell.expect b/t/chainlint/here-doc-close-subshell.expect
index f011e33..7d9c2b5 100644
--- a/t/chainlint/here-doc-close-subshell.expect
+++ b/t/chainlint/here-doc-close-subshell.expect
@@ -1,2 +1,4 @@
 (
->	cat)
+	cat <<-\INPUT)
+	fizz
+	INPUT
diff --git a/t/chainlint/here-doc-indent-operator.expect b/t/chainlint/here-doc-indent-operator.expect
new file mode 100644
index 0000000..f92a7ce
--- /dev/null
+++ b/t/chainlint/here-doc-indent-operator.expect
@@ -0,0 +1,11 @@
+cat >expect <<- EOF &&
+header: 43475048 1 $(test_oid oid_version) $NUM_CHUNKS 0
+num_commits: $1
+chunks: oid_fanout oid_lookup commit_metadata generation_data bloom_indexes bloom_data
+EOF
+
+cat >expect << -EOF ?!AMP?!
+this is not indented
+-EOF
+
+cleanup
diff --git a/t/chainlint/here-doc-indent-operator.test b/t/chainlint/here-doc-indent-operator.test
new file mode 100644
index 0000000..c8a6f18
--- /dev/null
+++ b/t/chainlint/here-doc-indent-operator.test
@@ -0,0 +1,13 @@
+# LINT: whitespace between operator "<<-" and tag legal
+cat >expect <<- EOF &&
+header: 43475048 1 $(test_oid oid_version) $NUM_CHUNKS 0
+num_commits: $1
+chunks: oid_fanout oid_lookup commit_metadata generation_data bloom_indexes bloom_data
+EOF
+
+# LINT: not an indented here-doc; just a plain here-doc with tag named "-EOF"
+cat >expect << -EOF
+this is not indented
+-EOF
+
+cleanup
diff --git a/t/chainlint/here-doc-multi-line-command-subst.expect b/t/chainlint/here-doc-multi-line-command-subst.expect
index e5fb752..b7364c8 100644
--- a/t/chainlint/here-doc-multi-line-command-subst.expect
+++ b/t/chainlint/here-doc-multi-line-command-subst.expect
@@ -1,5 +1,8 @@
 (
-	x=$(bobble &&
-?!AMP?!>>		wiffle)
+	x=$(bobble <<-\END &&
+		fossil
+		vegetable
+		END
+		wiffle) ?!AMP?!
 	echo $x
->)
+)
diff --git a/t/chainlint/here-doc-multi-line-string.expect b/t/chainlint/here-doc-multi-line-string.expect
index 32038a0..6c13bdc 100644
--- a/t/chainlint/here-doc-multi-line-string.expect
+++ b/t/chainlint/here-doc-multi-line-string.expect
@@ -1,4 +1,7 @@
 (
-?!AMP?!	cat && echo "multi-line	string"
+	cat <<-\TXT && echo "multi-line
+	string" ?!AMP?!
+	fizzle
+	TXT
 	bap
->)
+)
diff --git a/t/chainlint/here-doc.expect b/t/chainlint/here-doc.expect
index 534b065..91b9612 100644
--- a/t/chainlint/here-doc.expect
+++ b/t/chainlint/here-doc.expect
@@ -1,9 +1,25 @@
-boodle wobba        gorgo snoot        wafta snurb &&
+boodle wobba \
+       gorgo snoot \
+       wafta snurb <<EOF &&
+quoth the raven,
+nevermore...
+EOF
 
-cat >foo &&
+cat <<-Arbitrary_Tag_42 >foo &&
+snoz
+boz
+woz
+Arbitrary_Tag_42
 
-cat >bar &&
+cat <<"zump" >boo &&
+snoz
+boz
+woz
+zump
 
-cat >boo &&
-
-horticulture
+horticulture <<\EOF
+gomez
+morticia
+wednesday
+pugsly
+EOF
diff --git a/t/chainlint/here-doc.test b/t/chainlint/here-doc.test
index ad4ce8a..3f5f92c 100644
--- a/t/chainlint/here-doc.test
+++ b/t/chainlint/here-doc.test
@@ -14,13 +14,6 @@ boz
 woz
 Arbitrary_Tag_42
 
-# LINT: swallow 'quoted' here-doc
-cat <<'FUMP' >bar &&
-snoz
-boz
-woz
-FUMP
-
 # LINT: swallow "quoted" here-doc
 cat <<"zump" >boo &&
 snoz
diff --git a/t/chainlint/if-condition-split.expect b/t/chainlint/if-condition-split.expect
new file mode 100644
index 0000000..ee745ef
--- /dev/null
+++ b/t/chainlint/if-condition-split.expect
@@ -0,0 +1,7 @@
+if bob &&
+   marcia ||
+   kevin
+then
+	echo "nomads" ?!AMP?!
+	echo "for sure"
+fi
diff --git a/t/chainlint/if-condition-split.test b/t/chainlint/if-condition-split.test
new file mode 100644
index 0000000..240daa9
--- /dev/null
+++ b/t/chainlint/if-condition-split.test
@@ -0,0 +1,8 @@
+# LINT: "if" condition split across multiple lines at "&&" or "||"
+if bob &&
+   marcia ||
+   kevin
+then
+	echo "nomads"
+	echo "for sure"
+fi
diff --git a/t/chainlint/if-in-loop.expect b/t/chainlint/if-in-loop.expect
index 03d3ceb..d6514ae 100644
--- a/t/chainlint/if-in-loop.expect
+++ b/t/chainlint/if-in-loop.expect
@@ -3,10 +3,10 @@
 	do
 		if false
 		then
-?!AMP?!			echo "err"
+			echo "err"
 			exit 1
-?!AMP?!		fi
+		fi ?!AMP?!
 		foo
-?!AMP?!	done
+	done ?!AMP?!
 	bar
->)
+)
diff --git a/t/chainlint/if-in-loop.test b/t/chainlint/if-in-loop.test
index daf22da..90c2397 100644
--- a/t/chainlint/if-in-loop.test
+++ b/t/chainlint/if-in-loop.test
@@ -3,13 +3,13 @@
 	do
 		if false
 		then
-# LINT: missing "&&" on 'echo'
+# LINT: missing "&&" on "echo" okay since "exit 1" signals error explicitly
 			echo "err"
 			exit 1
-# LINT: missing "&&" on 'fi'
+# LINT: missing "&&" on "fi"
 		fi
 		foo
-# LINT: missing "&&" on 'done'
+# LINT: missing "&&" on "done"
 	done
 	bar
 )
diff --git a/t/chainlint/if-then-else.expect b/t/chainlint/if-then-else.expect
index 5953c7b..cbaaf85 100644
--- a/t/chainlint/if-then-else.expect
+++ b/t/chainlint/if-then-else.expect
@@ -1,19 +1,22 @@
 (
 	if test -n ""
 	then
-?!AMP?!		echo very
+		echo very ?!AMP?!
 		echo empty
 	elif test -z ""
+	then
 		echo foo
 	else
 		echo foo &&
-		cat
-?!AMP?!	fi
+		cat <<-\EOF
+		bar
+		EOF
+	fi ?!AMP?!
 	echo poodle
->) &&
+) &&
 (
 	if test -n ""; then
 		echo very &&
-?!AMP?!		echo empty
-	if
->)
+		echo empty
+	fi
+)
diff --git a/t/chainlint/if-then-else.test b/t/chainlint/if-then-else.test
index 9bd8e9a..2055336 100644
--- a/t/chainlint/if-then-else.test
+++ b/t/chainlint/if-then-else.test
@@ -1,28 +1,29 @@
 (
-# LINT: 'if', 'then', 'elif', 'else', 'fi' do not need "&&"
+# LINT: "if", "then", "elif", "else", "fi" do not need "&&"
 	if test -n ""
 	then
-# LINT: missing "&&" on 'echo'
+# LINT: missing "&&" on "echo"
 		echo very
-# LINT: last statement before 'elif' does not need "&&"
+# LINT: last statement before "elif" does not need "&&"
 		echo empty
 	elif test -z ""
-# LINT: last statement before 'else' does not need "&&"
+	then
+# LINT: last statement before "else" does not need "&&"
 		echo foo
 	else
 		echo foo &&
-# LINT: last statement before 'fi' does not need "&&"
+# LINT: last statement before "fi" does not need "&&"
 		cat <<-\EOF
 		bar
 		EOF
-# LINT: missing "&&" on 'fi'
+# LINT: missing "&&" on "fi"
 	fi
 	echo poodle
 ) &&
 (
-# LINT: 'then' on same line as 'if'
+# LINT: "then" on same line as "if"
 	if test -n ""; then
 		echo very &&
 		echo empty
-	if
+	fi
 )
diff --git a/t/chainlint/incomplete-line.expect b/t/chainlint/incomplete-line.expect
index 2f3ebab..134d3a1 100644
--- a/t/chainlint/incomplete-line.expect
+++ b/t/chainlint/incomplete-line.expect
@@ -1,4 +1,10 @@
-line 1 line 2 line 3 line 4 &&
+line 1 \
+line 2 \
+line 3 \
+line 4 &&
 (
-	line 5 	line 6 	line 7 	line 8
->)
+	line 5 \
+	line 6 \
+	line 7 \
+	line 8
+)
diff --git a/t/chainlint/inline-comment.expect b/t/chainlint/inline-comment.expect
index fc9f250..6bad218 100644
--- a/t/chainlint/inline-comment.expect
+++ b/t/chainlint/inline-comment.expect
@@ -1,9 +1,8 @@
 (
-	foobar &&
-?!AMP?!	barfoo
+	foobar && # comment 1
+	barfoo ?!AMP?! # wrong position for &&
 	flibble "not a # comment"
->) &&
+) &&
 
-(
-cd foo &&
->	flibble "not a # comment")
+(cd foo &&
+	flibble "not a # comment")
diff --git a/t/chainlint/loop-detect-failure.expect b/t/chainlint/loop-detect-failure.expect
new file mode 100644
index 0000000..a66025c
--- /dev/null
+++ b/t/chainlint/loop-detect-failure.expect
@@ -0,0 +1,15 @@
+git init r1 &&
+for n in 1 2 3 4 5
+do
+	echo "This is file: $n" > r1/file.$n &&
+	git -C r1 add file.$n &&
+	git -C r1 commit -m "$n" || return 1
+done &&
+
+git init r2 &&
+for n in 1000 10000
+do
+	printf "%"$n"s" X > r2/large.$n &&
+	git -C r2 add large.$n &&
+	git -C r2 commit -m "$n" ?!LOOP?!
+done
diff --git a/t/chainlint/loop-detect-failure.test b/t/chainlint/loop-detect-failure.test
new file mode 100644
index 0000000..b9791cc
--- /dev/null
+++ b/t/chainlint/loop-detect-failure.test
@@ -0,0 +1,17 @@
+git init r1 &&
+# LINT: loop handles failure explicitly with "|| return 1"
+for n in 1 2 3 4 5
+do
+	echo "This is file: $n" > r1/file.$n &&
+	git -C r1 add file.$n &&
+	git -C r1 commit -m "$n" || return 1
+done &&
+
+git init r2 &&
+# LINT: loop fails to handle failure explicitly with "|| return 1"
+for n in 1000 10000
+do
+	printf "%"$n"s" X > r2/large.$n &&
+	git -C r2 add large.$n &&
+	git -C r2 commit -m "$n"
+done
diff --git a/t/chainlint/loop-detect-status.expect b/t/chainlint/loop-detect-status.expect
new file mode 100644
index 0000000..7ce3a34
--- /dev/null
+++ b/t/chainlint/loop-detect-status.expect
@@ -0,0 +1,18 @@
+(while test $i -le $blobcount
+ do
+	printf "Generating blob $i/$blobcount\r" >&2 &&
+	printf "blob\nmark :$i\ndata $blobsize\n" &&
+	#test-tool genrandom $i $blobsize &&
+	printf "%-${blobsize}s" $i &&
+	echo "M 100644 :$i $i" >> commit &&
+	i=$(($i+1)) ||
+	echo $? > exit-status
+ done &&
+ echo "commit refs/heads/main" &&
+ echo "author A U Thor <author@email.com> 123456789 +0000" &&
+ echo "committer C O Mitter <committer@email.com> 123456789 +0000" &&
+ echo "data 5" &&
+ echo ">2gb" &&
+ cat commit) |
+git fast-import --big-file-threshold=2 &&
+test ! -f exit-status
diff --git a/t/chainlint/loop-detect-status.test b/t/chainlint/loop-detect-status.test
new file mode 100644
index 0000000..1c6c23c
--- /dev/null
+++ b/t/chainlint/loop-detect-status.test
@@ -0,0 +1,19 @@
+# LINT: "$?" handled explicitly within loop body
+(while test $i -le $blobcount
+ do
+	printf "Generating blob $i/$blobcount\r" >&2 &&
+	printf "blob\nmark :$i\ndata $blobsize\n" &&
+	#test-tool genrandom $i $blobsize &&
+	printf "%-${blobsize}s" $i &&
+	echo "M 100644 :$i $i" >> commit &&
+	i=$(($i+1)) ||
+	echo $? > exit-status
+ done &&
+ echo "commit refs/heads/main" &&
+ echo "author A U Thor <author@email.com> 123456789 +0000" &&
+ echo "committer C O Mitter <committer@email.com> 123456789 +0000" &&
+ echo "data 5" &&
+ echo ">2gb" &&
+ cat commit) |
+git fast-import --big-file-threshold=2 &&
+test ! -f exit-status
diff --git a/t/chainlint/loop-in-if.expect b/t/chainlint/loop-in-if.expect
index 088e622..6c5d6e5 100644
--- a/t/chainlint/loop-in-if.expect
+++ b/t/chainlint/loop-in-if.expect
@@ -3,10 +3,10 @@
 	then
 		while true
 		do
-?!AMP?!			echo "pop"
-			echo "glup"
-?!AMP?!		done
+			echo "pop" ?!AMP?!
+			echo "glup" ?!LOOP?!
+		done ?!AMP?!
 		foo
-?!AMP?!	fi
+	fi ?!AMP?!
 	bar
->)
+)
diff --git a/t/chainlint/loop-in-if.test b/t/chainlint/loop-in-if.test
index 93e8ba8..dfcc3f9 100644
--- a/t/chainlint/loop-in-if.test
+++ b/t/chainlint/loop-in-if.test
@@ -3,13 +3,13 @@
 	then
 		while true
 		do
-# LINT: missing "&&" on 'echo'
+# LINT: missing "&&" on "echo"
 			echo "pop"
 			echo "glup"
-# LINT: missing "&&" on 'done'
+# LINT: missing "&&" on "done"
 		done
 		foo
-# LINT: missing "&&" on 'fi'
+# LINT: missing "&&" on "fi"
 	fi
 	bar
 )
diff --git a/t/chainlint/loop-upstream-pipe.expect b/t/chainlint/loop-upstream-pipe.expect
new file mode 100644
index 0000000..0b82ecc
--- /dev/null
+++ b/t/chainlint/loop-upstream-pipe.expect
@@ -0,0 +1,10 @@
+(
+	git rev-list --objects --no-object-names base..loose |
+	while read oid
+	do
+		path="$objdir/$(test_oid_to_path "$oid")" &&
+		printf "%s %d\n" "$oid" "$(test-tool chmtime --get "$path")" ||
+		echo "object list generation failed for $oid"
+	done |
+	sort -k1
+) >expect &&
diff --git a/t/chainlint/loop-upstream-pipe.test b/t/chainlint/loop-upstream-pipe.test
new file mode 100644
index 0000000..efb77da
--- /dev/null
+++ b/t/chainlint/loop-upstream-pipe.test
@@ -0,0 +1,11 @@
+(
+	git rev-list --objects --no-object-names base..loose |
+	while read oid
+	do
+# LINT: "|| echo" signals failure in loop upstream of a pipe
+		path="$objdir/$(test_oid_to_path "$oid")" &&
+		printf "%s %d\n" "$oid" "$(test-tool chmtime --get "$path")" ||
+		echo "object list generation failed for $oid"
+	done |
+	sort -k1
+) >expect &&
diff --git a/t/chainlint/multi-line-nested-command-substitution.expect b/t/chainlint/multi-line-nested-command-substitution.expect
index 59b6c8b..3000583 100644
--- a/t/chainlint/multi-line-nested-command-substitution.expect
+++ b/t/chainlint/multi-line-nested-command-substitution.expect
@@ -3,16 +3,16 @@
 	x=$(
 		echo bar |
 		cat
->>	) &&
+	) &&
 	echo ok
->) |
+) |
 sort &&
 (
 	bar &&
 	x=$(echo bar |
 		cat
->>	) &&
+	) &&
 	y=$(echo baz |
->>		fip) &&
+		fip) &&
 	echo fail
->)
+)
diff --git a/t/chainlint/multi-line-string.expect b/t/chainlint/multi-line-string.expect
index 170cb59..27ff952 100644
--- a/t/chainlint/multi-line-string.expect
+++ b/t/chainlint/multi-line-string.expect
@@ -1,15 +1,14 @@
 (
-	x="line 1		line 2		line 3" &&
-?!AMP?!	y='line 1		line2'
+	x="line 1
+		line 2
+		line 3" &&
+	y="line 1
+		line2" ?!AMP?!
 	foobar
->) &&
+) &&
 (
-	echo "there's nothing to see here" &&
-	exit
->) &&
-(
-	echo "xyz" "abc		def		ghi" &&
-	echo 'xyz' 'abc		def		ghi' &&
-	echo 'xyz' "abc		def		ghi" &&
+	echo "xyz" "abc
+		def
+		ghi" &&
 	barfoo
->)
+)
diff --git a/t/chainlint/multi-line-string.test b/t/chainlint/multi-line-string.test
index 287ab89..4a0af21 100644
--- a/t/chainlint/multi-line-string.test
+++ b/t/chainlint/multi-line-string.test
@@ -3,25 +3,13 @@
 		line 2
 		line 3" &&
 # LINT: missing "&&" on assignment
-	y='line 1
-		line2'
+	y="line 1
+		line2"
 	foobar
 ) &&
 (
-# LINT: apostrophe (in a contraction) within string not misinterpreted as
-# LINT: starting multi-line single-quoted string
-	echo "there's nothing to see here" &&
-	exit
-) &&
-(
 	echo "xyz" "abc
 		def
 		ghi" &&
-	echo 'xyz' 'abc
-		def
-		ghi' &&
-	echo 'xyz' "abc
-		def
-		ghi" &&
 	barfoo
 )
diff --git a/t/chainlint/negated-one-liner.expect b/t/chainlint/negated-one-liner.expect
index cf18429..ad4c2d9 100644
--- a/t/chainlint/negated-one-liner.expect
+++ b/t/chainlint/negated-one-liner.expect
@@ -1,5 +1,5 @@
 ! (foo && bar) &&
 ! (foo && bar) >baz &&
 
-?!SEMI?!! (foo; bar) &&
-?!SEMI?!! (foo; bar) >baz
+! (foo; ?!AMP?! bar) &&
+! (foo; ?!AMP?! bar) >baz
diff --git a/t/chainlint/nested-cuddled-subshell.expect b/t/chainlint/nested-cuddled-subshell.expect
index c2a59ff..3836049 100644
--- a/t/chainlint/nested-cuddled-subshell.expect
+++ b/t/chainlint/nested-cuddled-subshell.expect
@@ -1,19 +1,25 @@
 (
 	(cd foo &&
 		bar
->>	) &&
+	) &&
+
 	(cd foo &&
 		bar
-?!AMP?!>>	)
+	) ?!AMP?!
+
 	(
 		cd foo &&
->>		bar) &&
+		bar) &&
+
 	(
 		cd foo &&
-?!AMP?!>>		bar)
+		bar) ?!AMP?!
+
 	(cd foo &&
->>		bar) &&
+		bar) &&
+
 	(cd foo &&
-?!AMP?!>>		bar)
+		bar) ?!AMP?!
+
 	foobar
->)
+)
diff --git a/t/chainlint/nested-here-doc.expect b/t/chainlint/nested-here-doc.expect
index 0c9ef1c..29b3832 100644
--- a/t/chainlint/nested-here-doc.expect
+++ b/t/chainlint/nested-here-doc.expect
@@ -1,7 +1,30 @@
-cat >foop &&
+cat <<ARBITRARY >foop &&
+naddle
+fub <<EOF
+	nozzle
+	noodle
+EOF
+formp
+ARBITRARY
 
 (
-	cat &&
-?!AMP?!	cat
+	cat <<-\INPUT_END &&
+	fish are mice
+	but geese go slow
+	data <<EOF
+		perl is lerp
+		and nothing else
+	EOF
+	toink
+	INPUT_END
+
+	cat <<-\EOT ?!AMP?!
+	text goes here
+	data <<EOF
+		data goes here
+	EOF
+	more test here
+	EOT
+
 	foobar
->)
+)
diff --git a/t/chainlint/nested-loop-detect-failure.expect b/t/chainlint/nested-loop-detect-failure.expect
new file mode 100644
index 0000000..3461df4
--- /dev/null
+++ b/t/chainlint/nested-loop-detect-failure.expect
@@ -0,0 +1,31 @@
+for i in 0 1 2 3 4 5 6 7 8 9;
+do
+	for j in 0 1 2 3 4 5 6 7 8 9;
+	do
+		echo "$i$j" >"path$i$j" ?!LOOP?!
+	done ?!LOOP?!
+done &&
+
+for i in 0 1 2 3 4 5 6 7 8 9;
+do
+	for j in 0 1 2 3 4 5 6 7 8 9;
+	do
+		echo "$i$j" >"path$i$j" || return 1
+	done
+done &&
+
+for i in 0 1 2 3 4 5 6 7 8 9;
+do
+	for j in 0 1 2 3 4 5 6 7 8 9;
+	do
+		echo "$i$j" >"path$i$j" ?!LOOP?!
+	done || return 1
+done &&
+
+for i in 0 1 2 3 4 5 6 7 8 9;
+do
+	for j in 0 1 2 3 4 5 6 7 8 9;
+	do
+		echo "$i$j" >"path$i$j" || return 1
+	done || return 1
+done
diff --git a/t/chainlint/nested-loop-detect-failure.test b/t/chainlint/nested-loop-detect-failure.test
new file mode 100644
index 0000000..e6f0c1a
--- /dev/null
+++ b/t/chainlint/nested-loop-detect-failure.test
@@ -0,0 +1,35 @@
+# LINT: neither loop handles failure explicitly with "|| return 1"
+for i in 0 1 2 3 4 5 6 7 8 9;
+do
+	for j in 0 1 2 3 4 5 6 7 8 9;
+	do
+		echo "$i$j" >"path$i$j"
+	done
+done &&
+
+# LINT: inner loop handles failure explicitly with "|| return 1"
+for i in 0 1 2 3 4 5 6 7 8 9;
+do
+	for j in 0 1 2 3 4 5 6 7 8 9;
+	do
+		echo "$i$j" >"path$i$j" || return 1
+	done
+done &&
+
+# LINT: outer loop handles failure explicitly with "|| return 1"
+for i in 0 1 2 3 4 5 6 7 8 9;
+do
+	for j in 0 1 2 3 4 5 6 7 8 9;
+	do
+		echo "$i$j" >"path$i$j"
+	done || return 1
+done &&
+
+# LINT: inner & outer loops handles failure explicitly with "|| return 1"
+for i in 0 1 2 3 4 5 6 7 8 9;
+do
+	for j in 0 1 2 3 4 5 6 7 8 9;
+	do
+		echo "$i$j" >"path$i$j" || return 1
+	done || return 1
+done
diff --git a/t/chainlint/nested-subshell-comment.expect b/t/chainlint/nested-subshell-comment.expect
index 15b68d4..9138cf3 100644
--- a/t/chainlint/nested-subshell-comment.expect
+++ b/t/chainlint/nested-subshell-comment.expect
@@ -6,6 +6,6 @@
 		# minor numbers of cows (or do they?)
 		baz &&
 		snaff
-?!AMP?!>>	)
+	) ?!AMP?!
 	fuzzy
->)
+)
diff --git a/t/chainlint/nested-subshell-comment.test b/t/chainlint/nested-subshell-comment.test
index 0ff136a..0215cdb 100644
--- a/t/chainlint/nested-subshell-comment.test
+++ b/t/chainlint/nested-subshell-comment.test
@@ -7,7 +7,7 @@
 		# minor numbers of cows (or do they?)
 		baz &&
 		snaff
-# LINT: missing "&&" on ')'
+# LINT: missing "&&" on ")"
 	)
 	fuzzy
 )
diff --git a/t/chainlint/nested-subshell.expect b/t/chainlint/nested-subshell.expect
index c8165ad..73ff285 100644
--- a/t/chainlint/nested-subshell.expect
+++ b/t/chainlint/nested-subshell.expect
@@ -3,10 +3,11 @@
 	(
 		echo a &&
 		echo b
->>	) >file &&
+	) >file &&
+
 	cd foo &&
 	(
-		echo a
+		echo a ?!AMP?!
 		echo b
->>	) >file
->)
+	) >file
+)
diff --git a/t/chainlint/nested-subshell.test b/t/chainlint/nested-subshell.test
index 998b05a..440ee99 100644
--- a/t/chainlint/nested-subshell.test
+++ b/t/chainlint/nested-subshell.test
@@ -7,7 +7,6 @@
 
 	cd foo &&
 	(
-# LINT: nested multi-line subshell not presently checked for missing "&&"
 		echo a
 		echo b
 	) >file
diff --git a/t/chainlint/not-heredoc.expect b/t/chainlint/not-heredoc.expect
new file mode 100644
index 0000000..2e9bb13
--- /dev/null
+++ b/t/chainlint/not-heredoc.expect
@@ -0,0 +1,14 @@
+echo "<<<<<<< ours" &&
+echo ourside &&
+echo "=======" &&
+echo theirside &&
+echo ">>>>>>> theirs" &&
+
+(
+	echo "<<<<<<< ours" &&
+	echo ourside &&
+	echo "=======" &&
+	echo theirside &&
+	echo ">>>>>>> theirs" ?!AMP?!
+	poodle
+) >merged
diff --git a/t/chainlint/not-heredoc.test b/t/chainlint/not-heredoc.test
new file mode 100644
index 0000000..9aa5734
--- /dev/null
+++ b/t/chainlint/not-heredoc.test
@@ -0,0 +1,16 @@
+# LINT: "<< ours" inside string is not here-doc
+echo "<<<<<<< ours" &&
+echo ourside &&
+echo "=======" &&
+echo theirside &&
+echo ">>>>>>> theirs" &&
+
+(
+# LINT: "<< ours" inside string is not here-doc
+	echo "<<<<<<< ours" &&
+	echo ourside &&
+	echo "=======" &&
+	echo theirside &&
+	echo ">>>>>>> theirs"
+	poodle
+) >merged
diff --git a/t/chainlint/one-liner-for-loop.expect b/t/chainlint/one-liner-for-loop.expect
new file mode 100644
index 0000000..51a3dc7
--- /dev/null
+++ b/t/chainlint/one-liner-for-loop.expect
@@ -0,0 +1,9 @@
+git init dir-rename-and-content &&
+(
+	cd dir-rename-and-content &&
+	test_write_lines 1 2 3 4 5 >foo &&
+	mkdir olddir &&
+	for i in a b c; do echo $i >olddir/$i; ?!LOOP?! done ?!AMP?!
+	git add foo olddir &&
+	git commit -m "original" &&
+)
diff --git a/t/chainlint/one-liner-for-loop.test b/t/chainlint/one-liner-for-loop.test
new file mode 100644
index 0000000..4bd8c06
--- /dev/null
+++ b/t/chainlint/one-liner-for-loop.test
@@ -0,0 +1,10 @@
+git init dir-rename-and-content &&
+(
+	cd dir-rename-and-content &&
+	test_write_lines 1 2 3 4 5 >foo &&
+	mkdir olddir &&
+# LINT: one-liner for-loop missing "|| exit"; also broken &&-chain
+	for i in a b c; do echo $i >olddir/$i; done
+	git add foo olddir &&
+	git commit -m "original" &&
+)
diff --git a/t/chainlint/one-liner.expect b/t/chainlint/one-liner.expect
index 237f227..57a7a44 100644
--- a/t/chainlint/one-liner.expect
+++ b/t/chainlint/one-liner.expect
@@ -2,8 +2,8 @@
 (foo && bar) |
 (foo && bar) >baz &&
 
-?!SEMI?!(foo; bar) &&
-?!SEMI?!(foo; bar) |
-?!SEMI?!(foo; bar) >baz
+(foo; ?!AMP?! bar) &&
+(foo; ?!AMP?! bar) |
+(foo; ?!AMP?! bar) >baz &&
 
 (foo "bar; baz")
diff --git a/t/chainlint/one-liner.test b/t/chainlint/one-liner.test
index ec9acb9..be9858f 100644
--- a/t/chainlint/one-liner.test
+++ b/t/chainlint/one-liner.test
@@ -3,10 +3,10 @@
 (foo && bar) |
 (foo && bar) >baz &&
 
-# LINT: top-level one-liner subshell missing internal "&&"
+# LINT: top-level one-liner subshell missing internal "&&" and broken &&-chain
 (foo; bar) &&
 (foo; bar) |
-(foo; bar) >baz
+(foo; bar) >baz &&
 
 # LINT: ";" in string not misinterpreted as broken &&-chain
 (foo "bar; baz")
diff --git a/t/chainlint/p4-filespec.expect b/t/chainlint/p4-filespec.expect
index 98b3d88..1290fd1 100644
--- a/t/chainlint/p4-filespec.expect
+++ b/t/chainlint/p4-filespec.expect
@@ -1,4 +1,4 @@
 (
 	p4 print -1 //depot/fiddle#42 >file &&
 	foobar
->)
+)
diff --git a/t/chainlint/pipe.expect b/t/chainlint/pipe.expect
index 211b901..811971b 100644
--- a/t/chainlint/pipe.expect
+++ b/t/chainlint/pipe.expect
@@ -2,7 +2,9 @@
 	foo |
 	bar |
 	baz &&
+
 	fish |
-?!AMP?!	cow
+	cow ?!AMP?!
+
 	sunder
->)
+)
diff --git a/t/chainlint/pipe.test b/t/chainlint/pipe.test
index e6af4de..dd82534 100644
--- a/t/chainlint/pipe.test
+++ b/t/chainlint/pipe.test
@@ -4,7 +4,7 @@
 	bar |
 	baz &&
 
-# LINT: final line of pipe sequence ('cow') lacking "&&"
+# LINT: final line of pipe sequence ("cow") lacking "&&"
 	fish |
 	cow
 
diff --git a/t/chainlint/return-loop.expect b/t/chainlint/return-loop.expect
new file mode 100644
index 0000000..cfc0549
--- /dev/null
+++ b/t/chainlint/return-loop.expect
@@ -0,0 +1,5 @@
+while test $i -lt $((num - 5))
+do
+	git notes add -m "notes for commit$i" HEAD~$i || return 1
+	i=$((i + 1))
+done
diff --git a/t/chainlint/return-loop.test b/t/chainlint/return-loop.test
new file mode 100644
index 0000000..f90b171
--- /dev/null
+++ b/t/chainlint/return-loop.test
@@ -0,0 +1,6 @@
+while test $i -lt $((num - 5))
+do
+# LINT: "|| return {n}" valid loop escape outside subshell; no "&&" needed
+	git notes add -m "notes for commit$i" HEAD~$i || return 1
+	i=$((i + 1))
+done
diff --git a/t/chainlint/semicolon.expect b/t/chainlint/semicolon.expect
index 1d79384..3aa2259 100644
--- a/t/chainlint/semicolon.expect
+++ b/t/chainlint/semicolon.expect
@@ -1,20 +1,19 @@
 (
-?!AMP?!?!SEMI?!	cat foo ; echo bar
-?!SEMI?!	cat foo ; echo bar
->) &&
+	cat foo ; ?!AMP?! echo bar ?!AMP?!
+	cat foo ; ?!AMP?! echo bar
+) &&
 (
-?!SEMI?!	cat foo ; echo bar &&
-?!SEMI?!	cat foo ; echo bar
->) &&
+	cat foo ; ?!AMP?! echo bar &&
+	cat foo ; ?!AMP?! echo bar
+) &&
 (
 	echo "foo; bar" &&
-?!SEMI?!	cat foo; echo bar
->) &&
+	cat foo; ?!AMP?! echo bar
+) &&
 (
-?!SEMI?!	foo;
->) &&
-(
-cd foo &&
+	foo;
+) &&
+(cd foo &&
 	for i in a b c; do
-?!SEMI?!		echo;
->	done)
+		echo; ?!LOOP?!
+	done)
diff --git a/t/chainlint/semicolon.test b/t/chainlint/semicolon.test
index d82c8eb..67e1192 100644
--- a/t/chainlint/semicolon.test
+++ b/t/chainlint/semicolon.test
@@ -15,11 +15,11 @@
 	cat foo; echo bar
 ) &&
 (
-# LINT: unnecessary terminating semicolon
+# LINT: semicolon unnecessary but legitimate
 	foo;
 ) &&
 (cd foo &&
 	for i in a b c; do
-# LINT: unnecessary terminating semicolon
+# LINT: semicolon unnecessary but legitimate
 		echo;
 	done)
diff --git a/t/chainlint/sqstring-in-sqstring.expect b/t/chainlint/sqstring-in-sqstring.expect
new file mode 100644
index 0000000..cf0b591
--- /dev/null
+++ b/t/chainlint/sqstring-in-sqstring.expect
@@ -0,0 +1,4 @@
+perl -e '
+	defined($_ = -s $_) or die for @ARGV;
+	exit 1 if $ARGV[0] <= $ARGV[1];
+' test-2-$packname_2.pack test-3-$packname_3.pack
diff --git a/t/chainlint/sqstring-in-sqstring.test b/t/chainlint/sqstring-in-sqstring.test
new file mode 100644
index 0000000..77a425e
--- /dev/null
+++ b/t/chainlint/sqstring-in-sqstring.test
@@ -0,0 +1,5 @@
+# LINT: SQ-string Perl code fragment within SQ-string
+perl -e '\''
+	defined($_ = -s $_) or die for @ARGV;
+	exit 1 if $ARGV[0] <= $ARGV[1];
+'\'' test-2-$packname_2.pack test-3-$packname_3.pack
diff --git a/t/chainlint/subshell-here-doc.expect b/t/chainlint/subshell-here-doc.expect
index 74723e7..75d6f60 100644
--- a/t/chainlint/subshell-here-doc.expect
+++ b/t/chainlint/subshell-here-doc.expect
@@ -1,11 +1,30 @@
 (
-	echo wobba 	       gorgo snoot 	       wafta snurb &&
-?!AMP?!	cat >bip
-	echo >bop
->) &&
+	echo wobba \
+	       gorgo snoot \
+	       wafta snurb <<-EOF &&
+	quoth the raven,
+	nevermore...
+	EOF
+
+	cat <<EOF >bip ?!AMP?!
+	fish fly high
+EOF
+
+	echo <<-\EOF >bop
+	gomez
+	morticia
+	wednesday
+	pugsly
+	EOF
+) &&
 (
-	cat >bup &&
-	cat >bup2 &&
-	cat >bup3 &&
+	cat <<-\ARBITRARY >bup &&
+	glink
+	FIZZ
+	ARBITRARY
+	cat <<-"ARBITRARY3" >bup3 &&
+	glink
+	FIZZ
+	ARBITRARY3
 	meep
->)
+)
diff --git a/t/chainlint/subshell-here-doc.test b/t/chainlint/subshell-here-doc.test
index f6b3ba4..d40eb65 100644
--- a/t/chainlint/subshell-here-doc.test
+++ b/t/chainlint/subshell-here-doc.test
@@ -8,10 +8,10 @@
 	nevermore...
 	EOF
 
-# LINT: missing "&&" on 'cat'
+# LINT: missing "&&" on "cat"
 	cat <<EOF >bip
 	fish fly high
-	EOF
+EOF
 
 # LINT: swallow here-doc (EOF is last line of subshell)
 	echo <<-\EOF >bop
@@ -27,10 +27,6 @@
 	glink
 	FIZZ
 	ARBITRARY
-	cat <<-'ARBITRARY2' >bup2 &&
-	glink
-	FIZZ
-	ARBITRARY2
 	cat <<-"ARBITRARY3" >bup3 &&
 	glink
 	FIZZ
diff --git a/t/chainlint/subshell-one-liner.expect b/t/chainlint/subshell-one-liner.expect
index 5116282..8f69499 100644
--- a/t/chainlint/subshell-one-liner.expect
+++ b/t/chainlint/subshell-one-liner.expect
@@ -2,13 +2,18 @@
 	(foo && bar) &&
 	(foo && bar) |
 	(foo && bar) >baz &&
-?!SEMI?!	(foo; bar) &&
-?!SEMI?!	(foo; bar) |
-?!SEMI?!	(foo; bar) >baz &&
+
+	(foo; ?!AMP?! bar) &&
+	(foo; ?!AMP?! bar) |
+	(foo; ?!AMP?! bar) >baz &&
+
 	(foo || exit 1) &&
 	(foo || exit 1) |
 	(foo || exit 1) >baz &&
-?!AMP?!	(foo && bar)
-?!AMP?!?!SEMI?!	(foo && bar; baz)
+
+	(foo && bar) ?!AMP?!
+
+	(foo && bar; ?!AMP?! baz) ?!AMP?!
+
 	foobar
->)
+)
diff --git a/t/chainlint/t7900-subtree.expect b/t/chainlint/t7900-subtree.expect
index c991342..02f3129 100644
--- a/t/chainlint/t7900-subtree.expect
+++ b/t/chainlint/t7900-subtree.expect
@@ -1,10 +1,22 @@
 (
-	chks="sub1sub2sub3sub4" &&
-	chks_sub=$(cat | sed 's,^,sub dir/,'
->>) &&
-	chkms="main-sub1main-sub2main-sub3main-sub4" &&
-	chkms_sub=$(cat | sed 's,^,sub dir/,'
->>) &&
+	chks="sub1
+sub2
+sub3
+sub4" &&
+	chks_sub=$(cat <<TXT | sed "s,^,sub dir/,"
+$chks
+TXT
+) &&
+	chkms="main-sub1
+main-sub2
+main-sub3
+main-sub4" &&
+	chkms_sub=$(cat <<TXT | sed "s,^,sub dir/,"
+$chkms
+TXT
+) &&
+
 	subfiles=$(git ls-files) &&
-	check_equal "$subfiles" "$chkms$chks"
->)
+	check_equal "$subfiles" "$chkms
+$chks"
+)
diff --git a/t/chainlint/t7900-subtree.test b/t/chainlint/t7900-subtree.test
index 277d835..02f3129 100644
--- a/t/chainlint/t7900-subtree.test
+++ b/t/chainlint/t7900-subtree.test
@@ -3,7 +3,7 @@
 sub2
 sub3
 sub4" &&
-	chks_sub=$(cat <<TXT | sed 's,^,sub dir/,'
+	chks_sub=$(cat <<TXT | sed "s,^,sub dir/,"
 $chks
 TXT
 ) &&
@@ -11,7 +11,7 @@ TXT
 main-sub2
 main-sub3
 main-sub4" &&
-	chkms_sub=$(cat <<TXT | sed 's,^,sub dir/,'
+	chkms_sub=$(cat <<TXT | sed "s,^,sub dir/,"
 $chkms
 TXT
 ) &&
diff --git a/t/chainlint/token-pasting.expect b/t/chainlint/token-pasting.expect
new file mode 100644
index 0000000..6a38791
--- /dev/null
+++ b/t/chainlint/token-pasting.expect
@@ -0,0 +1,27 @@
+git config filter.rot13.smudge ./rot13.sh &&
+git config filter.rot13.clean ./rot13.sh &&
+
+{
+    echo "*.t filter=rot13" ?!AMP?!
+    echo "*.i ident"
+} >.gitattributes &&
+
+{
+    echo a b c d e f g h i j k l m ?!AMP?!
+    echo n o p q r s t u v w x y z ?!AMP?!
+    echo '$Id$'
+} >test &&
+cat test >test.t &&
+cat test >test.o &&
+cat test >test.i &&
+git add test test.t test.i &&
+rm -f test test.t test.i &&
+git checkout -- test test.t test.i &&
+
+echo "content-test2" >test2.o &&
+echo "content-test3 - filename with special characters" >"test3 'sq',$x=.o" ?!AMP?!
+
+downstream_url_for_sed=$(
+	printf "%sn" "$downstream_url" |
+	sed -e 's/\/\\/g' -e 's/[[/.*^$]/\&/g'
+)
diff --git a/t/chainlint/token-pasting.test b/t/chainlint/token-pasting.test
new file mode 100644
index 0000000..b4610ce
--- /dev/null
+++ b/t/chainlint/token-pasting.test
@@ -0,0 +1,32 @@
+# LINT: single token; composite of multiple strings
+git config filter.rot13.smudge ./rot13.sh &&
+git config filter.rot13.clean ./rot13.sh &&
+
+{
+    echo "*.t filter=rot13"
+    echo "*.i ident"
+} >.gitattributes &&
+
+{
+    echo a b c d e f g h i j k l m
+    echo n o p q r s t u v w x y z
+# LINT: exit/enter string context and escaped-quote outside of string
+    echo '\''$Id$'\''
+} >test &&
+cat test >test.t &&
+cat test >test.o &&
+cat test >test.i &&
+git add test test.t test.i &&
+rm -f test test.t test.i &&
+git checkout -- test test.t test.i &&
+
+echo "content-test2" >test2.o &&
+# LINT: exit/enter string context and escaped-quote outside of string
+echo "content-test3 - filename with special characters" >"test3 '\''sq'\'',\$x=.o"
+
+# LINT: single token; composite of multiple strings
+downstream_url_for_sed=$(
+	printf "%s\n" "$downstream_url" |
+# LINT: exit/enter string context; "&" inside string not command terminator
+	sed -e '\''s/\\/\\\\/g'\'' -e '\''s/[[/.*^$]/\\&/g'\''
+)
diff --git a/t/chainlint/unclosed-here-doc-indent.expect b/t/chainlint/unclosed-here-doc-indent.expect
new file mode 100644
index 0000000..7c30a1a
--- /dev/null
+++ b/t/chainlint/unclosed-here-doc-indent.expect
@@ -0,0 +1,4 @@
+command_which_is_run &&
+cat >expect <<-\EOF ?!UNCLOSED-HEREDOC?! &&
+we forget to end the here-doc
+command_which_is_gobbled
diff --git a/t/chainlint/unclosed-here-doc-indent.test b/t/chainlint/unclosed-here-doc-indent.test
new file mode 100644
index 0000000..5c841a9
--- /dev/null
+++ b/t/chainlint/unclosed-here-doc-indent.test
@@ -0,0 +1,4 @@
+command_which_is_run &&
+cat >expect <<-\EOF &&
+we forget to end the here-doc
+command_which_is_gobbled
diff --git a/t/chainlint/unclosed-here-doc.expect b/t/chainlint/unclosed-here-doc.expect
new file mode 100644
index 0000000..d65e50f
--- /dev/null
+++ b/t/chainlint/unclosed-here-doc.expect
@@ -0,0 +1,7 @@
+command_which_is_run &&
+cat >expect <<\EOF ?!UNCLOSED-HEREDOC?! &&
+	we try to end the here-doc below,
+	but the indentation throws us off
+	since the operator is not "<<-".
+	EOF
+command_which_is_gobbled
diff --git a/t/chainlint/unclosed-here-doc.test b/t/chainlint/unclosed-here-doc.test
new file mode 100644
index 0000000..69d3786
--- /dev/null
+++ b/t/chainlint/unclosed-here-doc.test
@@ -0,0 +1,7 @@
+command_which_is_run &&
+cat >expect <<\EOF &&
+	we try to end the here-doc below,
+	but the indentation throws us off
+	since the operator is not "<<-".
+	EOF
+command_which_is_gobbled
diff --git a/t/chainlint/while-loop.expect b/t/chainlint/while-loop.expect
index 13cff2c..06c1567 100644
--- a/t/chainlint/while-loop.expect
+++ b/t/chainlint/while-loop.expect
@@ -1,11 +1,14 @@
 (
 	while true
 	do
-?!AMP?!		echo foo
-		cat
-?!AMP?!	done
+		echo foo ?!AMP?!
+		cat <<-\EOF ?!LOOP?!
+		bar
+		EOF
+	done ?!AMP?!
+
 	while true; do
 		echo foo &&
-		cat bar
+		cat bar ?!LOOP?!
 	done
->)
+)
diff --git a/t/chainlint/while-loop.test b/t/chainlint/while-loop.test
index f1df085..d09fb01 100644
--- a/t/chainlint/while-loop.test
+++ b/t/chainlint/while-loop.test
@@ -1,17 +1,17 @@
 (
-# LINT: 'while, 'do', 'done' do not need "&&"
+# LINT: "while", "do", "done" do not need "&&"
 	while true
 	do
-# LINT: missing "&&" on 'echo'
+# LINT: missing "&&" on "echo"
 		echo foo
 # LINT: last statement of while does not need "&&"
 		cat <<-\EOF
 		bar
 		EOF
-# LINT: missing "&&" on 'done'
+# LINT: missing "&&" on "done"
 	done
 
-# LINT: 'do' on same line as 'while'
+# LINT: "do" on same line as "while"
 	while true; do
 		echo foo &&
 		cat bar
diff --git a/t/check-non-portable-shell.pl b/t/check-non-portable-shell.pl
index fd33035..b2b28c2 100755
--- a/t/check-non-portable-shell.pl
+++ b/t/check-non-portable-shell.pl
@@ -45,7 +45,10 @@ while (<>) {
 	/\bhead\s+-c\b/ and err 'head -c is not portable (use test_copy_bytes BYTES <file >out)';
 	/(?:\$\(seq|^\s*seq\b)/ and err 'seq is not portable (use test_seq)';
 	/\bgrep\b.*--file\b/ and err 'grep --file FILE is not portable (use grep -f FILE)';
+	/\b[ef]grep\b/ and err 'egrep/fgrep obsolescent (use grep -E/-F)';
 	/\bexport\s+[A-Za-z0-9_]*=/ and err '"export FOO=bar" is not portable (use FOO=bar && export FOO)';
+	/\blocal\s+[A-Za-z0-9_]*=\$([A-Za-z0-9_{]|[(][^(])/ and
+		err q(quote "$val" in 'local var=$val');
 	/^\s*([A-Z0-9_]+=(\w*|(["']).*?\3)\s+)+(\w+)/ and exists($func{$4}) and
 		err '"FOO=bar shell_func" assignment extends beyond "shell_func"';
 	$line = '';
diff --git a/t/diff-lib/COPYING b/t/diff-lib/COPYING
deleted file mode 100644
index 6ff87c4..0000000
--- a/t/diff-lib/COPYING
+++ /dev/null
@@ -1,361 +0,0 @@
-
- Note that the only valid version of the GPL as far as this project
- is concerned is _this_ particular version of the license (ie v2, not
- v2.2 or v3.x or whatever), unless explicitly otherwise stated.
-
- HOWEVER, in order to allow a migration to GPLv3 if that seems like
- a good idea, I also ask that people involved with the project make
- their preferences known. In particular, if you trust me to make that
- decision, you might note so in your copyright message, ie something
- like
-
-	This file is licensed under the GPL v2, or a later version
-	at the discretion of Linus.
-
-  might avoid issues. But we can also just decide to synchronize and
-  contact all copyright holders on record if/when the occasion arises.
-
-			Linus Torvalds
-
-----------------------------------------
-
-		    GNU GENERAL PUBLIC LICENSE
-		       Version 2, June 1991
-
- Copyright (C) 1989, 1991 Free Software Foundation, Inc.
-                       59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
- Everyone is permitted to copy and distribute verbatim copies
- of this license document, but changing it is not allowed.
-
-			    Preamble
-
-  The licenses for most software are designed to take away your
-freedom to share and change it.  By contrast, the GNU General Public
-License is intended to guarantee your freedom to share and change free
-software--to make sure the software is free for all its users.  This
-General Public License applies to most of the Free Software
-Foundation's software and to any other program whose authors commit to
-using it.  (Some other Free Software Foundation software is covered by
-the GNU Library General Public License instead.)  You can apply it to
-your programs, too.
-
-  When we speak of free software, we are referring to freedom, not
-price.  Our General Public Licenses are designed to make sure that you
-have the freedom to distribute copies of free software (and charge for
-this service if you wish), that you receive source code or can get it
-if you want it, that you can change the software or use pieces of it
-in new free programs; and that you know you can do these things.
-
-  To protect your rights, we need to make restrictions that forbid
-anyone to deny you these rights or to ask you to surrender the rights.
-These restrictions translate to certain responsibilities for you if you
-distribute copies of the software, or if you modify it.
-
-  For example, if you distribute copies of such a program, whether
-gratis or for a fee, you must give the recipients all the rights that
-you have.  You must make sure that they, too, receive or can get the
-source code.  And you must show them these terms so they know their
-rights.
-
-  We protect your rights with two steps: (1) copyright the software, and
-(2) offer you this license which gives you legal permission to copy,
-distribute and/or modify the software.
-
-  Also, for each author's protection and ours, we want to make certain
-that everyone understands that there is no warranty for this free
-software.  If the software is modified by someone else and passed on, we
-want its recipients to know that what they have is not the original, so
-that any problems introduced by others will not reflect on the original
-authors' reputations.
-
-  Finally, any free program is threatened constantly by software
-patents.  We wish to avoid the danger that redistributors of a free
-program will individually obtain patent licenses, in effect making the
-program proprietary.  To prevent this, we have made it clear that any
-patent must be licensed for everyone's free use or not licensed at all.
-
-  The precise terms and conditions for copying, distribution and
-modification follow.
-
-		    GNU GENERAL PUBLIC LICENSE
-   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
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-
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-under Section 2) in object code or executable form under the terms of
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-
-  4. You may not copy, modify, sublicense, or distribute the Program
-except as expressly provided under this License.  Any attempt
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-You are not responsible for enforcing compliance by third parties to
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-infringement or for any other reason (not limited to patent issues),
-conditions are imposed on you (whether by court order, agreement or
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-may not distribute the Program at all.  For example, if a patent
-license would not permit royalty-free redistribution of the Program by
-all those who receive copies directly or indirectly through you, then
-the only way you could satisfy both it and this License would be to
-refrain entirely from distribution of the Program.
-
-If any portion of this section is held invalid or unenforceable under
-any particular circumstance, the balance of the section is intended to
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-It is not the purpose of this section to induce you to infringe any
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-integrity of the free software distribution system, which is
-implemented by public license practices.  Many people have made
-generous contributions to the wide range of software distributed
-through that system in reliance on consistent application of that
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-to distribute software through any other system and a licensee cannot
-impose that choice.
-
-This section is intended to make thoroughly clear what is believed to
-be a consequence of the rest of this License.
-
-  8. If the distribution and/or use of the Program is restricted in
-certain countries either by patents or by copyrighted interfaces, the
-original copyright holder who places the Program under this License
-may add an explicit geographical distribution limitation excluding
-those countries, so that distribution is permitted only in or among
-countries not thus excluded.  In such case, this License incorporates
-the limitation as if written in the body of this License.
-
-  9. The Free Software Foundation may publish revised and/or new versions
-of the General Public License from time to time.  Such new versions will
-be similar in spirit to the present version, but may differ in detail to
-address new problems or concerns.
-
-Each version is given a distinguishing version number.  If the Program
-specifies a version number of this License which applies to it and "any
-later version", you have the option of following the terms and conditions
-either of that version or of any later version published by the Free
-Software Foundation.  If the Program does not specify a version number of
-this License, you may choose any version ever published by the Free Software
-Foundation.
-
-  10. If you wish to incorporate parts of the Program into other free
-programs whose distribution conditions are different, write to the author
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-Software Foundation, write to the Free Software Foundation; we sometimes
-make exceptions for this.  Our decision will be guided by the two goals
-of preserving the free status of all derivatives of our free software and
-of promoting the sharing and reuse of software generally.
-
-			    NO WARRANTY
-
-  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
-FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
-OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
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-  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
-WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
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-PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
-POSSIBILITY OF SUCH DAMAGES.
-
-		     END OF TERMS AND CONDITIONS
-
-	    How to Apply These Terms to Your New Programs
-
-  If you develop a new program, and you want it to be of the greatest
-possible use to the public, the best way to achieve this is to make it
-free software which everyone can redistribute and change under these terms.
-
-  To do so, attach the following notices to the program.  It is safest
-to attach them to the start of each source file to most effectively
-convey the exclusion of warranty; and each file should have at least
-the "copyright" line and a pointer to where the full notice is found.
-
-    <one line to give the program's name and a brief idea of what it does.>
-    Copyright (C) <year>  <name of author>
-
-    This program is free software; you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation; either version 2 of the License, or
-    (at your option) any later version.
-
-    This program is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
-
-    You should have received a copy of the GNU General Public License
-    along with this program; if not, write to the Free Software
-    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
-
-
-Also add information on how to contact you by electronic and paper mail.
-
-If the program is interactive, make it output a short notice like this
-when it starts in an interactive mode:
-
-    Gnomovision version 69, Copyright (C) year name of author
-    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
-    This is free software, and you are welcome to redistribute it
-    under certain conditions; type `show c' for details.
-
-The hypothetical commands `show w' and `show c' should show the appropriate
-parts of the General Public License.  Of course, the commands you use may
-be called something other than `show w' and `show c'; they could even be
-mouse-clicks or menu items--whatever suits your program.
-
-You should also get your employer (if you work as a programmer) or your
-school, if any, to sign a "copyright disclaimer" for the program, if
-necessary.  Here is a sample; alter the names:
-
-  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
-  `Gnomovision' (which makes passes at compilers) written by James Hacker.
-
-  <signature of Ty Coon>, 1 April 1989
-  Ty Coon, President of Vice
-
-This General Public License does not permit incorporating your program into
-proprietary programs.  If your program is a subroutine library, you may
-consider it more useful to permit linking proprietary applications with the
-library.  If this is what you want to do, use the GNU Library General
-Public License instead of this License.
diff --git a/t/diff-lib/README b/t/diff-lib/README
deleted file mode 100644
index 548142c..0000000
--- a/t/diff-lib/README
+++ /dev/null
@@ -1,46 +0,0 @@
-////////////////////////////////////////////////////////////////
-
-	GIT - the stupid content tracker
-
-////////////////////////////////////////////////////////////////
-
-"git" can mean anything, depending on your mood.
-
- - random three-letter combination that is pronounceable, and not
-   actually used by any common UNIX command.  The fact that it is a
-   mispronunciation of "get" may or may not be relevant.
- - stupid. contemptible and despicable. simple. Take your pick from the
-   dictionary of slang.
- - "global information tracker": you're in a good mood, and it actually
-   works for you. Angels sing, and a light suddenly fills the room.
- - "goddamn idiotic truckload of sh*t": when it breaks
-
-Git is a fast, scalable, distributed revision control system with an
-unusually rich command set that provides both high-level operations
-and full access to internals.
-
-Git is an Open Source project covered by the GNU General Public License.
-It was originally written by Linus Torvalds with help of a group of
-hackers around the net. It is currently maintained by Junio C Hamano.
-
-Please read the file INSTALL for installation instructions.
-See Documentation/tutorial.txt to get started, then see
-Documentation/everyday.txt for a useful minimum set of commands,
-and "man git-commandname" for documentation of each command.
-CVS users may also want to read Documentation/cvs-migration.txt.
-
-Many Git online resources are accessible from http://git.or.cz/
-including full documentation and Git related tools.
-
-The user discussion and development of Git take place on the Git
-mailing list -- everyone is welcome to post bug reports, feature
-requests, comments and patches to git@vger.kernel.org. To subscribe
-to the list, send an email with just "subscribe git" in the body to
-majordomo@vger.kernel.org. The mailing list archives are available at
-http://marc.theaimsgroup.com/?l=git and other archival sites.
-
-The messages titled "A note from the maintainer", "What's in
-git.git (stable)" and "What's cooking in git.git (topics)" and
-the discussion following them on the mailing list give a good
-reference for project status, development direction and
-remaining tasks.
diff --git a/t/helper/.gitignore b/t/helper/.gitignore
index 48c7bb0..8c2ddcc 100644
--- a/t/helper/.gitignore
+++ b/t/helper/.gitignore
@@ -1,4 +1,2 @@
 /test-tool
 /test-fake-ssh
-/test-line-buffer
-/test-svn-fe
diff --git a/t/helper/test-advise.c b/t/helper/test-advise.c
index 38cdc28..8a3fd00 100644
--- a/t/helper/test-advise.c
+++ b/t/helper/test-advise.c
@@ -1,12 +1,12 @@
 #include "test-tool.h"
-#include "cache.h"
 #include "advice.h"
 #include "config.h"
+#include "setup.h"
 
 int cmd__advise_if_enabled(int argc, const char **argv)
 {
-	if (!argv[1])
-	die("usage: %s <advice>", argv[0]);
+	if (argc != 2)
+		die("usage: %s <advice>", argv[0]);
 
 	setup_git_directory();
 	git_config(git_default_config, NULL);
@@ -16,7 +16,7 @@ int cmd__advise_if_enabled(int argc, const char **argv)
 	 * selected here and in t0018 where this command is being
 	 * executed.
 	 */
-	advise_if_enabled(ADVICE_NESTED_TAG, argv[1]);
+	advise_if_enabled(ADVICE_NESTED_TAG, "%s", argv[1]);
 
 	return 0;
 }
diff --git a/t/helper/test-bitmap.c b/t/helper/test-bitmap.c
new file mode 100644
index 0000000..af43ee1
--- /dev/null
+++ b/t/helper/test-bitmap.c
@@ -0,0 +1,33 @@
+#include "test-tool.h"
+#include "git-compat-util.h"
+#include "pack-bitmap.h"
+#include "setup.h"
+
+static int bitmap_list_commits(void)
+{
+	return test_bitmap_commits(the_repository);
+}
+
+static int bitmap_dump_hashes(void)
+{
+	return test_bitmap_hashes(the_repository);
+}
+
+int cmd__bitmap(int argc, const char **argv)
+{
+	setup_git_directory();
+
+	if (argc != 2)
+		goto usage;
+
+	if (!strcmp(argv[1], "list-commits"))
+		return bitmap_list_commits();
+	if (!strcmp(argv[1], "dump-hashes"))
+		return bitmap_dump_hashes();
+
+usage:
+	usage("\ttest-tool bitmap list-commits\n"
+	      "\ttest-tool bitmap dump-hashes");
+
+	return -1;
+}
diff --git a/t/helper/test-bloom.c b/t/helper/test-bloom.c
index 5e77d56..1281e66 100644
--- a/t/helper/test-bloom.c
+++ b/t/helper/test-bloom.c
@@ -1,7 +1,9 @@
-#include "git-compat-util.h"
-#include "bloom.h"
 #include "test-tool.h"
+#include "bloom.h"
+#include "hex.h"
 #include "commit.h"
+#include "repository.h"
+#include "setup.h"
 
 static struct bloom_filter_settings settings = DEFAULT_BLOOM_FILTER_SETTINGS;
 
@@ -16,6 +18,7 @@ static void add_string_to_filter(const char *data, struct bloom_filter *filter)
 		}
 		printf("\n");
 		add_key_to_filter(&key, filter, &settings);
+		clear_bloom_key(&key);
 }
 
 static void print_bloom_filter(struct bloom_filter *filter) {
@@ -37,16 +40,17 @@ static void get_bloom_filter_for_commit(const struct object_id *commit_oid)
 {
 	struct commit *c;
 	struct bloom_filter *filter;
-	setup_git_directory();
 	c = lookup_commit(the_repository, commit_oid);
-	filter = get_bloom_filter(the_repository, c, 1);
+	filter = get_or_compute_bloom_filter(the_repository, c, 1,
+					     &settings,
+					     NULL);
 	print_bloom_filter(filter);
 }
 
 static const char *bloom_usage = "\n"
 "  test-tool bloom get_murmur3 <string>\n"
 "  test-tool bloom generate_filter <string> [<string>...]\n"
-"  test-tool get_filter_for_commit <commit-hex>\n";
+"  test-tool bloom get_filter_for_commit <commit-hex>\n";
 
 int cmd__bloom(int argc, const char **argv)
 {
@@ -67,7 +71,7 @@ int cmd__bloom(int argc, const char **argv)
 		struct bloom_filter filter;
 		int i = 2;
 		filter.len =  (settings.bits_per_entry + BITS_PER_WORD - 1) / BITS_PER_WORD;
-		filter.data = xcalloc(filter.len, sizeof(unsigned char));
+		CALLOC_ARRAY(filter.data, filter.len);
 
 		if (argc - 1 < i)
 			usage(bloom_usage);
@@ -78,6 +82,7 @@ int cmd__bloom(int argc, const char **argv)
 		}
 
 		print_bloom_filter(&filter);
+		free(filter.data);
 	}
 
 	if (!strcmp(argv[1], "get_filter_for_commit")) {
diff --git a/t/helper/test-bundle-uri.c b/t/helper/test-bundle-uri.c
new file mode 100644
index 0000000..09dc787
--- /dev/null
+++ b/t/helper/test-bundle-uri.c
@@ -0,0 +1,135 @@
+#include "test-tool.h"
+#include "parse-options.h"
+#include "bundle-uri.h"
+#include "gettext.h"
+#include "strbuf.h"
+#include "string-list.h"
+#include "transport.h"
+#include "remote.h"
+
+enum input_mode {
+	KEY_VALUE_PAIRS,
+	CONFIG_FILE,
+};
+
+static int cmd__bundle_uri_parse(int argc, const char **argv, enum input_mode mode)
+{
+	const char *key_value_usage[] = {
+		"test-tool bundle-uri parse-key-values <input>",
+		NULL
+	};
+	const char *config_usage[] = {
+		"test-tool bundle-uri parse-config <input>",
+		NULL
+	};
+	const char **usage = key_value_usage;
+	struct option options[] = {
+		OPT_END(),
+	};
+	struct strbuf sb = STRBUF_INIT;
+	struct bundle_list list;
+	int err = 0;
+	FILE *fp;
+
+	if (mode == CONFIG_FILE)
+		usage = config_usage;
+
+	argc = parse_options(argc, argv, NULL, options, usage,
+			     PARSE_OPT_STOP_AT_NON_OPTION);
+
+	init_bundle_list(&list);
+
+	list.baseURI = xstrdup("<uri>");
+
+	switch (mode) {
+	case KEY_VALUE_PAIRS:
+		if (argc != 1)
+			goto usage;
+		fp = fopen(argv[0], "r");
+		if (!fp)
+			die("failed to open '%s'", argv[0]);
+		while (strbuf_getline(&sb, fp) != EOF) {
+			if (bundle_uri_parse_line(&list, sb.buf))
+				err = error("bad line: '%s'", sb.buf);
+		}
+		fclose(fp);
+		break;
+
+	case CONFIG_FILE:
+		if (argc != 1)
+			goto usage;
+		err = bundle_uri_parse_config_format("<uri>", argv[0], &list);
+		break;
+	}
+	strbuf_release(&sb);
+
+	print_bundle_list(stdout, &list);
+
+	clear_bundle_list(&list);
+
+	return !!err;
+
+usage:
+	usage_with_options(usage, options);
+}
+
+static int cmd_ls_remote(int argc, const char **argv)
+{
+	const char *dest;
+	struct remote *remote;
+	struct transport *transport;
+	int status = 0;
+
+	dest = argc > 1 ? argv[1] : NULL;
+
+	remote = remote_get(dest);
+	if (!remote) {
+		if (dest)
+			die(_("bad repository '%s'"), dest);
+		die(_("no remote configured to get bundle URIs from"));
+	}
+	if (!remote->url_nr)
+		die(_("remote '%s' has no configured URL"), dest);
+
+	transport = transport_get(remote, NULL);
+	if (transport_get_remote_bundle_uri(transport) < 0) {
+		error(_("could not get the bundle-uri list"));
+		status = 1;
+		goto cleanup;
+	}
+
+	print_bundle_list(stdout, transport->bundles);
+
+cleanup:
+	if (transport_disconnect(transport))
+		return 1;
+	return status;
+}
+
+int cmd__bundle_uri(int argc, const char **argv)
+{
+	const char *usage[] = {
+		"test-tool bundle-uri <subcommand> [<options>]",
+		NULL
+	};
+	struct option options[] = {
+		OPT_END(),
+	};
+
+	argc = parse_options(argc, argv, NULL, options, usage,
+			     PARSE_OPT_STOP_AT_NON_OPTION |
+			     PARSE_OPT_KEEP_ARGV0);
+	if (argc == 1)
+		goto usage;
+
+	if (!strcmp(argv[1], "parse-key-values"))
+		return cmd__bundle_uri_parse(argc - 1, argv + 1, KEY_VALUE_PAIRS);
+	if (!strcmp(argv[1], "parse-config"))
+		return cmd__bundle_uri_parse(argc - 1, argv + 1, CONFIG_FILE);
+	if (!strcmp(argv[1], "ls-remote"))
+		return cmd_ls_remote(argc - 1, argv + 1);
+	error("there is no test-tool bundle-uri tool '%s'", argv[1]);
+
+usage:
+	usage_with_options(usage, options);
+}
diff --git a/t/helper/test-cache-tree.c b/t/helper/test-cache-tree.c
new file mode 100644
index 0000000..e723639
--- /dev/null
+++ b/t/helper/test-cache-tree.c
@@ -0,0 +1,69 @@
+#define USE_THE_INDEX_VARIABLE
+#include "test-tool.h"
+#include "gettext.h"
+#include "hex.h"
+#include "tree.h"
+#include "cache-tree.h"
+#include "parse-options.h"
+#include "read-cache-ll.h"
+#include "repository.h"
+#include "setup.h"
+
+static char const * const test_cache_tree_usage[] = {
+	N_("test-tool cache-tree <options> (control|prime|update)"),
+	NULL
+};
+
+int cmd__cache_tree(int argc, const char **argv)
+{
+	struct object_id oid;
+	struct tree *tree;
+	int empty = 0;
+	int invalidate_qty = 0;
+	int i;
+
+	struct option options[] = {
+		OPT_BOOL(0, "empty", &empty,
+			 N_("clear the cache tree before each iteration")),
+		OPT_INTEGER_F(0, "invalidate", &invalidate_qty,
+			      N_("number of entries in the cache tree to invalidate (default 0)"),
+			      PARSE_OPT_NONEG),
+		OPT_END()
+	};
+
+	setup_git_directory();
+
+	argc = parse_options(argc, argv, NULL, options, test_cache_tree_usage, 0);
+
+	if (repo_read_index(the_repository) < 0)
+		die(_("unable to read index file"));
+
+	oidcpy(&oid, &the_index.cache_tree->oid);
+	tree = parse_tree_indirect(&oid);
+	if (!tree)
+		die(_("not a tree object: %s"), oid_to_hex(&oid));
+
+	if (empty) {
+		/* clear the cache tree & allocate a new one */
+		cache_tree_free(&the_index.cache_tree);
+		the_index.cache_tree = cache_tree();
+	} else if (invalidate_qty) {
+		/* invalidate the specified number of unique paths */
+		float f_interval = (float)the_index.cache_nr / invalidate_qty;
+		int interval = f_interval < 1.0 ? 1 : (int)f_interval;
+		for (i = 0; i < invalidate_qty && i * interval < the_index.cache_nr; i++)
+			cache_tree_invalidate_path(&the_index, the_index.cache[i * interval]->name);
+	}
+
+	if (argc != 1)
+		usage_with_options(test_cache_tree_usage, options);
+	else if (!strcmp(argv[0], "prime"))
+		prime_cache_tree(the_repository, &the_index, tree);
+	else if (!strcmp(argv[0], "update"))
+		cache_tree_update(&the_index, WRITE_TREE_SILENT | WRITE_TREE_REPAIR);
+	/* use "control" subcommand to specify no-op */
+	else if (!!strcmp(argv[0], "control"))
+		die(_("Unhandled subcommand '%s'"), argv[0]);
+
+	return 0;
+}
diff --git a/t/helper/test-chmtime.c b/t/helper/test-chmtime.c
index aa22af4..0e55388 100644
--- a/t/helper/test-chmtime.c
+++ b/t/helper/test-chmtime.c
@@ -94,7 +94,7 @@ int cmd__chmtime(int argc, const char **argv)
 	if (timespec_arg(argv[i], &set_time, &set_eq)) {
 		++i;
 	} else {
-		if (get == 0) {
+		if (get == 0 && verbose == 0) {
 			fprintf(stderr, "Not a base-10 integer: %s\n", argv[i] + 1);
 			goto usage;
 		}
@@ -109,9 +109,9 @@ int cmd__chmtime(int argc, const char **argv)
 		uintmax_t mtime;
 
 		if (stat(argv[i], &sb) < 0) {
-			fprintf(stderr, "Failed to stat %s: %s\n",
+			fprintf(stderr, "Failed to stat %s: %s. Skipping\n",
 			        argv[i], strerror(errno));
-			return 1;
+			continue;
 		}
 
 #ifdef GIT_WINDOWS_NATIVE
@@ -134,6 +134,21 @@ int cmd__chmtime(int argc, const char **argv)
 		}
 
 		if (utb.modtime != sb.st_mtime && utime(argv[i], &utb) < 0) {
+#ifdef GIT_WINDOWS_NATIVE
+			if (S_ISDIR(sb.st_mode)) {
+				/*
+				 * NEEDSWORK: The Windows version of `utime()`
+				 * (aka `mingw_utime()`) does not correctly
+				 * handle directory arguments, since it uses
+				 * `_wopen()`.  Ignore it for now since this
+				 * is just a test.
+				 */
+				fprintf(stderr,
+					("Failed to modify time on directory %s. "
+					 "Skipping\n"), argv[i]);
+				continue;
+			}
+#endif
 			fprintf(stderr, "Failed to modify time on %s: %s\n",
 			        argv[i], strerror(errno));
 			return 1;
diff --git a/t/helper/test-config.c b/t/helper/test-config.c
index 234c722..ed444ca 100644
--- a/t/helper/test-config.c
+++ b/t/helper/test-config.c
@@ -1,6 +1,6 @@
 #include "test-tool.h"
-#include "cache.h"
 #include "config.h"
+#include "setup.h"
 #include "string-list.h"
 
 /*
@@ -14,6 +14,8 @@
  * get_value_multi -> prints all values for the entered key in increasing order
  *		     of priority
  *
+ * get -> print return value for the entered key
+ *
  * get_int -> print integer value for the entered key or die
  *
  * get_bool -> print bool value for the entered key or die
@@ -30,6 +32,9 @@
  * iterate -> iterate over all values using git_config(), and print some
  *            data for each
  *
+ * git_config_int -> iterate over all values using git_config() and print the
+ *                   integer value for the entered key or die
+ *
  * Examples:
  *
  * To print the value with highest priority for key "foo.bAr Baz.rock":
@@ -37,8 +42,11 @@
  *
  */
 
-static int iterate_cb(const char *var, const char *value, void *data)
+static int iterate_cb(const char *var, const char *value,
+		      const struct config_context *ctx,
+		      void *data UNUSED)
 {
+	const struct key_value_info *kvi = ctx->kvi;
 	static int nr;
 
 	if (nr++)
@@ -46,15 +54,29 @@ static int iterate_cb(const char *var, const char *value, void *data)
 
 	printf("key=%s\n", var);
 	printf("value=%s\n", value ? value : "(null)");
-	printf("origin=%s\n", current_config_origin_type());
-	printf("name=%s\n", current_config_name());
-	printf("lno=%d\n", current_config_line());
-	printf("scope=%s\n", config_scope_name(current_config_scope()));
+	printf("origin=%s\n", config_origin_type_name(kvi->origin_type));
+	printf("name=%s\n", kvi->filename ? kvi->filename : "");
+	printf("lno=%d\n", kvi->linenr);
+	printf("scope=%s\n", config_scope_name(kvi->scope));
 
 	return 0;
 }
 
-static int early_config_cb(const char *var, const char *value, void *vdata)
+static int parse_int_cb(const char *var, const char *value,
+			const struct config_context *ctx, void *data)
+{
+	const char *key_to_match = data;
+
+	if (!strcmp(key_to_match, var)) {
+		int parsed = git_config_int(value, value, ctx->kvi);
+		printf("%d\n", parsed);
+	}
+	return 0;
+}
+
+static int early_config_cb(const char *var, const char *value,
+			   const struct config_context *ctx UNUSED,
+			   void *vdata)
 {
 	const char *key = vdata;
 
@@ -95,8 +117,7 @@ int cmd__config(int argc, const char **argv)
 			goto exit1;
 		}
 	} else if (argc == 3 && !strcmp(argv[1], "get_value_multi")) {
-		strptr = git_config_get_value_multi(argv[2]);
-		if (strptr) {
+		if (!git_config_get_value_multi(argv[2], &strptr)) {
 			for (i = 0; i < strptr->nr; i++) {
 				v = strptr->items[i].string;
 				if (!v)
@@ -109,6 +130,26 @@ int cmd__config(int argc, const char **argv)
 			printf("Value not found for \"%s\"\n", argv[2]);
 			goto exit1;
 		}
+	} else if (argc == 3 && !strcmp(argv[1], "get")) {
+		int ret;
+
+		if (!(ret = git_config_get(argv[2])))
+			goto exit0;
+		else if (ret == 1)
+			printf("Value not found for \"%s\"\n", argv[2]);
+		else if (ret == -CONFIG_INVALID_KEY)
+			printf("Key \"%s\" is invalid\n", argv[2]);
+		else if (ret == -CONFIG_NO_SECTION_OR_NAME)
+			printf("Key \"%s\" has no section\n", argv[2]);
+		else
+			/*
+			 * A normal caller should just check "ret <
+			 * 0", but for our own tests let's BUG() if
+			 * our whitelist of git_config_parse_key()
+			 * return values isn't exhaustive.
+			 */
+			BUG("Key \"%s\" has unknown return %d", argv[2], ret);
+		goto exit1;
 	} else if (argc == 3 && !strcmp(argv[1], "get_int")) {
 		if (!git_config_get_int(argv[2], &val)) {
 			printf("%d\n", val);
@@ -126,7 +167,7 @@ int cmd__config(int argc, const char **argv)
 			goto exit1;
 		}
 	} else if (argc == 3 && !strcmp(argv[1], "get_string")) {
-		if (!git_config_get_string_const(argv[2], &v)) {
+		if (!git_config_get_string_tmp(argv[2], &v)) {
 			printf("%s\n", v);
 			goto exit0;
 		} else {
@@ -141,7 +182,7 @@ int cmd__config(int argc, const char **argv)
 				goto exit2;
 			}
 		}
-		if (!git_configset_get_value(&cs, argv[2], &v)) {
+		if (!git_configset_get_value(&cs, argv[2], &v, NULL)) {
 			if (!v)
 				printf("(NULL)\n");
 			else
@@ -159,8 +200,7 @@ int cmd__config(int argc, const char **argv)
 				goto exit2;
 			}
 		}
-		strptr = git_configset_get_value_multi(&cs, argv[2]);
-		if (strptr) {
+		if (!git_configset_get_value_multi(&cs, argv[2], &strptr)) {
 			for (i = 0; i < strptr->nr; i++) {
 				v = strptr->items[i].string;
 				if (!v)
@@ -176,6 +216,9 @@ int cmd__config(int argc, const char **argv)
 	} else if (!strcmp(argv[1], "iterate")) {
 		git_config(iterate_cb, NULL);
 		goto exit0;
+	} else if (argc == 3 && !strcmp(argv[1], "git_config_int")) {
+		git_config(parse_int_cb, (void *) argv[2]);
+		goto exit0;
 	}
 
 	die("%s: Please check the syntax and the function name", argv[0]);
diff --git a/t/helper/test-crontab.c b/t/helper/test-crontab.c
new file mode 100644
index 0000000..597027a
--- /dev/null
+++ b/t/helper/test-crontab.c
@@ -0,0 +1,35 @@
+#include "test-tool.h"
+
+/*
+ * Usage: test-tool crontab <file> -l|<input>
+ *
+ * If -l is specified, then write the contents of <file> to stdout.
+ * Otherwise, copy the contents of <input> into <file>.
+ */
+int cmd__crontab(int argc, const char **argv)
+{
+	int a;
+	FILE *from, *to;
+
+	if (argc != 3)
+		usage("test-tool crontab <file> -l|<input>");
+
+	if (!strcmp(argv[2], "-l")) {
+		from = fopen(argv[1], "r");
+		if (!from)
+			return 0;
+		to = stdout;
+	} else {
+		from = xfopen(argv[2], "r");
+		to = xfopen(argv[1], "w");
+	}
+
+	while ((a = fgetc(from)) != EOF)
+		fputc(a, to);
+
+	fclose(from);
+	if (to != stdout)
+		fclose(to);
+
+	return 0;
+}
diff --git a/t/helper/test-csprng.c b/t/helper/test-csprng.c
new file mode 100644
index 0000000..65d1497
--- /dev/null
+++ b/t/helper/test-csprng.c
@@ -0,0 +1,29 @@
+#include "test-tool.h"
+#include "git-compat-util.h"
+
+
+int cmd__csprng(int argc, const char **argv)
+{
+	unsigned long count;
+	unsigned char buf[1024];
+
+	if (argc > 2) {
+		fprintf(stderr, "usage: %s [<size>]\n", argv[0]);
+		return 2;
+	}
+
+	count = (argc == 2) ? strtoul(argv[1], NULL, 0) : -1L;
+
+	while (count) {
+		unsigned long chunk = count < sizeof(buf) ? count : sizeof(buf);
+		if (csprng_bytes(buf, chunk) < 0) {
+			perror("failed to read");
+			return 5;
+		}
+		if (fwrite(buf, chunk, 1, stdout) != chunk)
+			return 1;
+		count -= chunk;
+	}
+
+	return 0;
+}
diff --git a/t/helper/test-ctype.c b/t/helper/test-ctype.c
deleted file mode 100644
index 92c4c23..0000000
--- a/t/helper/test-ctype.c
+++ /dev/null
@@ -1,43 +0,0 @@
-#include "test-tool.h"
-#include "cache.h"
-
-static int rc;
-
-static void report_error(const char *class, int ch)
-{
-	printf("%s classifies char %d (0x%02x) wrongly\n", class, ch, ch);
-	rc = 1;
-}
-
-static int is_in(const char *s, int ch)
-{
-	/* We can't find NUL using strchr.  It's classless anyway. */
-	if (ch == '\0')
-		return 0;
-	return !!strchr(s, ch);
-}
-
-#define TEST_CLASS(t,s) {			\
-	int i;					\
-	for (i = 0; i < 256; i++) {		\
-		if (is_in(s, i) != t(i))	\
-			report_error(#t, i);	\
-	}					\
-}
-
-#define DIGIT "0123456789"
-#define LOWER "abcdefghijklmnopqrstuvwxyz"
-#define UPPER "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
-
-int cmd__ctype(int argc, const char **argv)
-{
-	TEST_CLASS(isdigit, DIGIT);
-	TEST_CLASS(isspace, " \n\r\t");
-	TEST_CLASS(isalpha, LOWER UPPER);
-	TEST_CLASS(isalnum, LOWER UPPER DIGIT);
-	TEST_CLASS(is_glob_special, "*?[\\");
-	TEST_CLASS(is_regex_special, "$()*+.?[\\^{|");
-	TEST_CLASS(is_pathspec_magic, "!\"#%&',-/:;<=>@_`~");
-
-	return rc;
-}
diff --git a/t/helper/test-date.c b/t/helper/test-date.c
index 099eff4..f25512d 100644
--- a/t/helper/test-date.c
+++ b/t/helper/test-date.c
@@ -1,5 +1,6 @@
 #include "test-tool.h"
-#include "cache.h"
+#include "date.h"
+#include "trace.h"
 
 static const char *usage_msg = "\n"
 "  test-tool date relative [time_t]...\n"
@@ -34,7 +35,7 @@ static void show_human_dates(const char **argv)
 
 static void show_dates(const char **argv, const char *format)
 {
-	struct date_mode mode;
+	struct date_mode mode = DATE_MODE_INIT;
 
 	parse_date_format(format, &mode);
 	for (; *argv; argv++) {
@@ -51,8 +52,10 @@ static void show_dates(const char **argv, const char *format)
 			arg++;
 		tz = atoi(arg);
 
-		printf("%s -> %s\n", *argv, show_date(t, tz, &mode));
+		printf("%s -> %s\n", *argv, show_date(t, tz, mode));
 	}
+
+	date_mode_release(&mode);
 }
 
 static void parse_dates(const char **argv)
@@ -78,7 +81,7 @@ static void parse_approxidate(const char **argv)
 {
 	for (; *argv; argv++) {
 		timestamp_t t;
-		t = approxidate_relative(*argv);
+		t = approxidate(*argv);
 		printf("%s -> %s\n", *argv, show_date(t, 0, DATE_MODE(ISO8601)));
 	}
 }
@@ -87,7 +90,7 @@ static void parse_approx_timestamp(const char **argv)
 {
 	for (; *argv; argv++) {
 		timestamp_t t;
-		t = approxidate_relative(*argv);
+		t = approxidate(*argv);
 		printf("%s -> %"PRItime"\n", *argv, t);
 	}
 }
@@ -101,7 +104,7 @@ static void getnanos(const char **argv)
 	printf("%lf\n", seconds);
 }
 
-int cmd__date(int argc, const char **argv)
+int cmd__date(int argc UNUSED, const char **argv)
 {
 	const char *x;
 
diff --git a/t/helper/test-delete-gpgsig.c b/t/helper/test-delete-gpgsig.c
new file mode 100644
index 0000000..e36831a
--- /dev/null
+++ b/t/helper/test-delete-gpgsig.c
@@ -0,0 +1,62 @@
+#include "test-tool.h"
+#include "gpg-interface.h"
+#include "strbuf.h"
+
+
+int cmd__delete_gpgsig(int argc, const char **argv)
+{
+	struct strbuf buf = STRBUF_INIT;
+	const char *pattern = "gpgsig";
+	const char *bufptr, *tail, *eol;
+	int deleting = 0;
+	size_t plen;
+
+	if (argc >= 2) {
+		pattern = argv[1];
+		argv++;
+		argc--;
+	}
+
+	plen = strlen(pattern);
+	strbuf_read(&buf, 0, 0);
+
+	if (!strcmp(pattern, "trailer")) {
+		size_t payload_size = parse_signed_buffer(buf.buf, buf.len);
+		fwrite(buf.buf, 1, payload_size, stdout);
+		fflush(stdout);
+		return 0;
+	}
+
+	bufptr = buf.buf;
+	tail = bufptr + buf.len;
+
+	while (bufptr < tail) {
+		/* Find the end of the line */
+		eol = memchr(bufptr, '\n', tail - bufptr);
+		if (!eol)
+			eol = tail;
+
+		/* Drop continuation lines */
+		if (deleting && (bufptr < eol) && (bufptr[0] == ' ')) {
+			bufptr = eol + 1;
+			continue;
+		}
+		deleting = 0;
+
+		/* Does the line match the prefix? */
+		if (((bufptr + plen) < eol) &&
+		    !memcmp(bufptr, pattern, plen) &&
+		    (bufptr[plen] == ' ')) {
+			deleting = 1;
+			bufptr = eol + 1;
+			continue;
+		}
+
+		/* Print all other lines */
+		fwrite(bufptr, 1, (eol - bufptr) + 1, stdout);
+		bufptr = eol + 1;
+	}
+	fflush(stdout);
+
+	return 0;
+}
diff --git a/t/helper/test-delta.c b/t/helper/test-delta.c
index e749a49..6bc787a 100644
--- a/t/helper/test-delta.c
+++ b/t/helper/test-delta.c
@@ -11,7 +11,6 @@
 #include "test-tool.h"
 #include "git-compat-util.h"
 #include "delta.h"
-#include "cache.h"
 
 static const char usage_str[] =
 	"test-tool delta (-d|-p) <from_file> <data_file> <out_file>";
@@ -20,8 +19,9 @@ int cmd__delta(int argc, const char **argv)
 {
 	int fd;
 	struct stat st;
-	void *from_buf, *data_buf, *out_buf;
+	void *from_buf = NULL, *data_buf = NULL, *out_buf = NULL;
 	unsigned long from_size, data_size, out_size;
+	int ret = 1;
 
 	if (argc != 5 || (strcmp(argv[1], "-d") && strcmp(argv[1], "-p"))) {
 		fprintf(stderr, "usage: %s\n", usage_str);
@@ -38,21 +38,21 @@ int cmd__delta(int argc, const char **argv)
 	if (read_in_full(fd, from_buf, from_size) < 0) {
 		perror(argv[2]);
 		close(fd);
-		return 1;
+		goto cleanup;
 	}
 	close(fd);
 
 	fd = open(argv[3], O_RDONLY);
 	if (fd < 0 || fstat(fd, &st)) {
 		perror(argv[3]);
-		return 1;
+		goto cleanup;
 	}
 	data_size = st.st_size;
 	data_buf = xmalloc(data_size);
 	if (read_in_full(fd, data_buf, data_size) < 0) {
 		perror(argv[3]);
 		close(fd);
-		return 1;
+		goto cleanup;
 	}
 	close(fd);
 
@@ -66,14 +66,20 @@ int cmd__delta(int argc, const char **argv)
 				      &out_size);
 	if (!out_buf) {
 		fprintf(stderr, "delta operation failed (returned NULL)\n");
-		return 1;
+		goto cleanup;
 	}
 
 	fd = open (argv[4], O_WRONLY|O_CREAT|O_TRUNC, 0666);
 	if (fd < 0 || write_in_full(fd, out_buf, out_size) < 0) {
 		perror(argv[4]);
-		return 1;
+		goto cleanup;
 	}
 
-	return 0;
+	ret = 0;
+cleanup:
+	free(from_buf);
+	free(data_buf);
+	free(out_buf);
+
+	return ret;
 }
diff --git a/t/helper/test-dir-iterator.c b/t/helper/test-dir-iterator.c
index 659b6bf..6b297bd 100644
--- a/t/helper/test-dir-iterator.c
+++ b/t/helper/test-dir-iterator.c
@@ -15,7 +15,7 @@ static const char *error_name(int error_number)
 
 /*
  * usage:
- * tool-test dir-iterator [--follow-symlinks] [--pedantic] directory_path
+ * tool-test dir-iterator [--pedantic] directory_path
  */
 int cmd__dir_iterator(int argc, const char **argv)
 {
@@ -24,9 +24,7 @@ int cmd__dir_iterator(int argc, const char **argv)
 	int iter_status;
 
 	for (++argv, --argc; *argv && starts_with(*argv, "--"); ++argv, --argc) {
-		if (strcmp(*argv, "--follow-symlinks") == 0)
-			flags |= DIR_ITERATOR_FOLLOW_SYMLINKS;
-		else if (strcmp(*argv, "--pedantic") == 0)
+		if (strcmp(*argv, "--pedantic") == 0)
 			flags |= DIR_ITERATOR_PEDANTIC;
 		else
 			die("invalid option '%s'", *argv);
diff --git a/t/helper/test-drop-caches.c b/t/helper/test-drop-caches.c
index 7b42784..73e551c 100644
--- a/t/helper/test-drop-caches.c
+++ b/t/helper/test-drop-caches.c
@@ -3,6 +3,7 @@
 
 #if defined(GIT_WINDOWS_NATIVE)
 #include "lazyload.h"
+#include <winnt.h>
 
 static int cmd_sync(void)
 {
@@ -86,7 +87,8 @@ static int cmd_dropcaches(void)
 {
 	HANDLE hProcess = GetCurrentProcess();
 	HANDLE hToken;
-	DECLARE_PROC_ADDR(ntdll.dll, DWORD, NtSetSystemInformation, INT, PVOID, ULONG);
+	DECLARE_PROC_ADDR(ntdll.dll, DWORD, NTAPI, NtSetSystemInformation, INT, PVOID,
+		ULONG);
 	SYSTEM_MEMORY_LIST_COMMAND command;
 	int status;
 
@@ -153,7 +155,7 @@ static int cmd_dropcaches(void)
 
 #endif
 
-int cmd__drop_caches(int argc, const char **argv)
+int cmd__drop_caches(int argc UNUSED, const char **argv UNUSED)
 {
 	cmd_sync();
 	return cmd_dropcaches();
diff --git a/t/helper/test-dump-cache-tree.c b/t/helper/test-dump-cache-tree.c
index 6a3f88f..c38f546 100644
--- a/t/helper/test-dump-cache-tree.c
+++ b/t/helper/test-dump-cache-tree.c
@@ -1,8 +1,12 @@
+#define USE_THE_INDEX_VARIABLE
 #include "test-tool.h"
-#include "cache.h"
+#include "hash.h"
+#include "hex.h"
 #include "tree.h"
 #include "cache-tree.h"
-
+#include "read-cache-ll.h"
+#include "repository.h"
+#include "setup.h"
 
 static void dump_one(struct cache_tree *it, const char *pfx, const char *x)
 {
@@ -55,15 +59,20 @@ static int dump_cache_tree(struct cache_tree *it,
 	return errs;
 }
 
-int cmd__dump_cache_tree(int ac, const char **av)
+int cmd__dump_cache_tree(int ac UNUSED, const char **av UNUSED)
 {
 	struct index_state istate;
 	struct cache_tree *another = cache_tree();
+	int ret;
+
 	setup_git_directory();
-	if (read_cache() < 0)
+	if (repo_read_index(the_repository) < 0)
 		die("unable to read index file");
 	istate = the_index;
 	istate.cache_tree = another;
 	cache_tree_update(&istate, WRITE_TREE_DRY_RUN);
-	return dump_cache_tree(active_cache_tree, another, "");
+	ret = dump_cache_tree(the_index.cache_tree, another, "");
+	cache_tree_free(&another);
+
+	return ret;
 }
diff --git a/t/helper/test-dump-fsmonitor.c b/t/helper/test-dump-fsmonitor.c
index 975f0ac..4f215fe 100644
--- a/t/helper/test-dump-fsmonitor.c
+++ b/t/helper/test-dump-fsmonitor.c
@@ -1,7 +1,9 @@
 #include "test-tool.h"
-#include "cache.h"
+#include "read-cache-ll.h"
+#include "repository.h"
+#include "setup.h"
 
-int cmd__dump_fsmonitor(int ac, const char **av)
+int cmd__dump_fsmonitor(int ac UNUSED, const char **av UNUSED)
 {
 	struct index_state *istate = the_repository->index;
 	int i;
diff --git a/t/helper/test-dump-split-index.c b/t/helper/test-dump-split-index.c
index a209880..f29d18e 100644
--- a/t/helper/test-dump-split-index.c
+++ b/t/helper/test-dump-split-index.c
@@ -1,14 +1,18 @@
+#define USE_THE_INDEX_VARIABLE
 #include "test-tool.h"
-#include "cache.h"
+#include "hex.h"
+#include "read-cache-ll.h"
+#include "repository.h"
+#include "setup.h"
 #include "split-index.h"
 #include "ewah/ewok.h"
 
-static void show_bit(size_t pos, void *data)
+static void show_bit(size_t pos, void *data UNUSED)
 {
 	printf(" %d", (int)pos);
 }
 
-int cmd__dump_split_index(int ac, const char **av)
+int cmd__dump_split_index(int ac UNUSED, const char **av)
 {
 	struct split_index *si;
 	int i;
diff --git a/t/helper/test-dump-untracked-cache.c b/t/helper/test-dump-untracked-cache.c
index cf0f2c7..b4af971 100644
--- a/t/helper/test-dump-untracked-cache.c
+++ b/t/helper/test-dump-untracked-cache.c
@@ -1,7 +1,10 @@
-#define USE_THE_INDEX_COMPATIBILITY_MACROS
+#define USE_THE_INDEX_VARIABLE
 #include "test-tool.h"
-#include "cache.h"
 #include "dir.h"
+#include "hex.h"
+#include "read-cache-ll.h"
+#include "repository.h"
+#include "setup.h"
 
 static int compare_untracked(const void *a_, const void *b_)
 {
@@ -40,16 +43,18 @@ static void dump(struct untracked_cache_dir *ucd, struct strbuf *base)
 	strbuf_setlen(base, len);
 }
 
-int cmd__dump_untracked_cache(int ac, const char **av)
+int cmd__dump_untracked_cache(int ac UNUSED, const char **av UNUSED)
 {
 	struct untracked_cache *uc;
 	struct strbuf base = STRBUF_INIT;
 
-	/* Hack to avoid modifying the untracked cache when we read it */
-	ignore_untracked_cache_config = 1;
+	/* Set core.untrackedCache=keep before setup_git_directory() */
+	xsetenv("GIT_CONFIG_COUNT", "1", 1);
+	xsetenv("GIT_CONFIG_KEY_0", "core.untrackedCache", 1);
+	xsetenv("GIT_CONFIG_VALUE_0", "keep", 1);
 
 	setup_git_directory();
-	if (read_cache() < 0)
+	if (repo_read_index(the_repository) < 0)
 		die("unable to read index file");
 	uc = the_index.untracked;
 	if (!uc) {
diff --git a/t/helper/test-env-helper.c b/t/helper/test-env-helper.c
new file mode 100644
index 0000000..1c48688
--- /dev/null
+++ b/t/helper/test-env-helper.c
@@ -0,0 +1,100 @@
+#include "test-tool.h"
+#include "parse.h"
+#include "parse-options.h"
+
+static char const * const env__helper_usage[] = {
+	"test-tool env-helper --type=[bool|ulong] <options> <env-var>",
+	NULL
+};
+
+enum cmdmode {
+	ENV_HELPER_TYPE_BOOL = 1,
+	ENV_HELPER_TYPE_ULONG
+};
+
+static int option_parse_type(const struct option *opt, const char *arg,
+			     int unset)
+{
+	enum cmdmode *cmdmode = opt->value;
+
+	BUG_ON_OPT_NEG(unset);
+
+	if (!strcmp(arg, "bool"))
+		*cmdmode = ENV_HELPER_TYPE_BOOL;
+	else if (!strcmp(arg, "ulong"))
+		*cmdmode = ENV_HELPER_TYPE_ULONG;
+	else
+		die("unrecognized --type argument, %s", arg);
+
+	return 0;
+}
+
+int cmd__env_helper(int argc, const char **argv)
+{
+	int exit_code = 0;
+	const char *env_variable = NULL;
+	const char *env_default = NULL;
+	int ret;
+	int ret_int, default_int;
+	unsigned long ret_ulong, default_ulong;
+	enum cmdmode cmdmode = 0;
+	struct option opts[] = {
+		OPT_CALLBACK_F(0, "type", &cmdmode, "type",
+			       "value is given this type", PARSE_OPT_NONEG,
+			       option_parse_type),
+		OPT_STRING(0, "default", &env_default, "value",
+			   "default for git_env_*(...) to fall back on"),
+		OPT_BOOL(0, "exit-code", &exit_code,
+			 "be quiet only use git_env_*() value as exit code"),
+		OPT_END(),
+	};
+
+	argc = parse_options(argc, argv, NULL, opts, env__helper_usage,
+			     PARSE_OPT_KEEP_UNKNOWN_OPT);
+	if (env_default && !*env_default)
+		usage_with_options(env__helper_usage, opts);
+	if (!cmdmode)
+		usage_with_options(env__helper_usage, opts);
+	if (argc != 1)
+		usage_with_options(env__helper_usage, opts);
+	env_variable = argv[0];
+
+	switch (cmdmode) {
+	case ENV_HELPER_TYPE_BOOL:
+		if (env_default) {
+			default_int = git_parse_maybe_bool(env_default);
+			if (default_int == -1) {
+				error("option `--default' expects a boolean value with `--type=bool`, not `%s`",
+				      env_default);
+				usage_with_options(env__helper_usage, opts);
+			}
+		} else {
+			default_int = 0;
+		}
+		ret_int = git_env_bool(env_variable, default_int);
+		if (!exit_code)
+			puts(ret_int ? "true" : "false");
+		ret = ret_int;
+		break;
+	case ENV_HELPER_TYPE_ULONG:
+		if (env_default) {
+			if (!git_parse_ulong(env_default, &default_ulong)) {
+				error("option `--default' expects an unsigned long value with `--type=ulong`, not `%s`",
+				      env_default);
+				usage_with_options(env__helper_usage, opts);
+			}
+		} else {
+			default_ulong = 0;
+		}
+		ret_ulong = git_env_ulong(env_variable, default_ulong);
+		if (!exit_code)
+			printf("%lu\n", ret_ulong);
+		ret = ret_ulong;
+		break;
+	default:
+		BUG("unknown <type> value");
+		break;
+	}
+
+	return !ret;
+}
diff --git a/t/helper/test-example-decorate.c b/t/helper/test-example-decorate.c
index c8a1cde..8f59f6b 100644
--- a/t/helper/test-example-decorate.c
+++ b/t/helper/test-example-decorate.c
@@ -1,9 +1,10 @@
 #include "test-tool.h"
-#include "cache.h"
+#include "git-compat-util.h"
 #include "object.h"
 #include "decorate.h"
+#include "repository.h"
 
-int cmd__example_decorate(int argc, const char **argv)
+int cmd__example_decorate(int argc UNUSED, const char **argv UNUSED)
 {
 	struct decoration n;
 	struct object_id one_oid = { {1} };
@@ -26,8 +27,8 @@ int cmd__example_decorate(int argc, const char **argv)
 	 * Add 2 objects, one with a non-NULL decoration and one with a NULL
 	 * decoration.
 	 */
-	one = lookup_unknown_object(&one_oid);
-	two = lookup_unknown_object(&two_oid);
+	one = lookup_unknown_object(the_repository, &one_oid);
+	two = lookup_unknown_object(the_repository, &two_oid);
 	ret = add_decoration(&n, one, &decoration_a);
 	if (ret)
 		BUG("when adding a brand-new object, NULL should be returned");
@@ -56,7 +57,7 @@ int cmd__example_decorate(int argc, const char **argv)
 	ret = lookup_decoration(&n, two);
 	if (ret != &decoration_b)
 		BUG("lookup should return added declaration");
-	three = lookup_unknown_object(&three_oid);
+	three = lookup_unknown_object(the_repository, &three_oid);
 	ret = lookup_decoration(&n, three);
 	if (ret)
 		BUG("lookup for unknown object should return NULL");
@@ -71,5 +72,7 @@ int cmd__example_decorate(int argc, const char **argv)
 	if (objects_noticed != 2)
 		BUG("should have 2 objects");
 
+	clear_decoration(&n, NULL);
+
 	return 0;
 }
diff --git a/t/helper/test-fake-ssh.c b/t/helper/test-fake-ssh.c
index 12beee9..27323cb 100644
--- a/t/helper/test-fake-ssh.c
+++ b/t/helper/test-fake-ssh.c
@@ -8,7 +8,7 @@ int cmd_main(int argc, const char **argv)
 	struct strbuf buf = STRBUF_INIT;
 	FILE *f;
 	int i;
-	const char *child_argv[] = { NULL, NULL };
+	struct child_process cmd = CHILD_PROCESS_INIT;
 
 	/* First, print all parameters into $TRASH_DIRECTORY/ssh-output */
 	if (!trash_directory)
@@ -17,6 +17,7 @@ int cmd_main(int argc, const char **argv)
 	f = fopen(buf.buf, "w");
 	if (!f)
 		die("Could not write to %s", buf.buf);
+	strbuf_release(&buf);
 	for (i = 0; i < argc; i++)
 		fprintf(f, "%s%s", i > 0 ? " " : "", i > 0 ? argv[i] : "ssh:");
 	fprintf(f, "\n");
@@ -25,6 +26,7 @@ int cmd_main(int argc, const char **argv)
 	/* Now, evaluate the *last* parameter */
 	if (argc < 2)
 		return 0;
-	child_argv[0] = argv[argc - 1];
-	return run_command_v_opt(child_argv, RUN_USING_SHELL);
+	cmd.use_shell = 1;
+	strvec_push(&cmd.args, argv[argc - 1]);
+	return run_command(&cmd);
 }
diff --git a/t/helper/test-find-pack.c b/t/helper/test-find-pack.c
new file mode 100644
index 0000000..e8bd793
--- /dev/null
+++ b/t/helper/test-find-pack.c
@@ -0,0 +1,50 @@
+#include "test-tool.h"
+#include "object-name.h"
+#include "object-store.h"
+#include "packfile.h"
+#include "parse-options.h"
+#include "setup.h"
+
+/*
+ * Display the path(s), one per line, of the packfile(s) containing
+ * the given object.
+ *
+ * If '--check-count <n>' is passed, then error out if the number of
+ * packfiles containing the object is not <n>.
+ */
+
+static const char *find_pack_usage[] = {
+	"test-tool find-pack [--check-count <n>] <object>",
+	NULL
+};
+
+int cmd__find_pack(int argc, const char **argv)
+{
+	struct object_id oid;
+	struct packed_git *p;
+	int count = -1, actual_count = 0;
+	const char *prefix = setup_git_directory();
+
+	struct option options[] = {
+		OPT_INTEGER('c', "check-count", &count, "expected number of packs"),
+		OPT_END(),
+	};
+
+	argc = parse_options(argc, argv, prefix, options, find_pack_usage, 0);
+	if (argc != 1)
+		usage(find_pack_usage[0]);
+
+	if (repo_get_oid(the_repository, argv[0], &oid))
+		die("cannot parse %s as an object name", argv[0]);
+
+	for (p = get_all_packs(the_repository); p; p = p->next)
+		if (find_pack_entry_one(oid.hash, p)) {
+			printf("%s\n", p->pack_name);
+			actual_count++;
+		}
+
+	if (count > -1 && count != actual_count)
+		die("bad packfile count %d instead of %d", actual_count, count);
+
+	return 0;
+}
diff --git a/t/helper/test-fsmonitor-client.c b/t/helper/test-fsmonitor-client.c
new file mode 100644
index 0000000..8280984
--- /dev/null
+++ b/t/helper/test-fsmonitor-client.c
@@ -0,0 +1,224 @@
+/*
+ * test-fsmonitor-client.c: client code to send commands/requests to
+ * a `git fsmonitor--daemon` daemon.
+ */
+
+#include "test-tool.h"
+#include "parse-options.h"
+#include "fsmonitor-ipc.h"
+#include "read-cache-ll.h"
+#include "repository.h"
+#include "setup.h"
+#include "thread-utils.h"
+#include "trace2.h"
+
+#ifndef HAVE_FSMONITOR_DAEMON_BACKEND
+int cmd__fsmonitor_client(int argc UNUSED, const char **argv UNUSED)
+{
+	die("fsmonitor--daemon not available on this platform");
+}
+#else
+
+/*
+ * Read the `.git/index` to get the last token written to the
+ * FSMonitor Index Extension.
+ */
+static const char *get_token_from_index(void)
+{
+	struct index_state *istate = the_repository->index;
+
+	if (do_read_index(istate, the_repository->index_file, 0) < 0)
+		die("unable to read index file");
+	if (!istate->fsmonitor_last_update)
+		die("index file does not have fsmonitor extension");
+
+	return istate->fsmonitor_last_update;
+}
+
+/*
+ * Send an IPC query to a `git-fsmonitor--daemon` daemon and
+ * ask for the changes since the given token or from the last
+ * token in the index extension.
+ *
+ * This will implicitly start a daemon process if necessary.  The
+ * daemon process will persist after we exit.
+ */
+static int do_send_query(const char *token)
+{
+	struct strbuf answer = STRBUF_INIT;
+	int ret;
+
+	if (!token || !*token)
+		token = get_token_from_index();
+
+	ret = fsmonitor_ipc__send_query(token, &answer);
+	if (ret < 0)
+		die("could not query fsmonitor--daemon");
+
+	write_in_full(1, answer.buf, answer.len);
+	strbuf_release(&answer);
+
+	return 0;
+}
+
+/*
+ * Send a "flush" command to the `git-fsmonitor--daemon` (if running)
+ * and tell it to flush its cache.
+ *
+ * This feature is primarily used by the test suite to simulate a loss of
+ * sync with the filesystem where we miss kernel events.
+ */
+static int do_send_flush(void)
+{
+	struct strbuf answer = STRBUF_INIT;
+	int ret;
+
+	ret = fsmonitor_ipc__send_command("flush", &answer);
+	if (ret)
+		return ret;
+
+	write_in_full(1, answer.buf, answer.len);
+	strbuf_release(&answer);
+
+	return 0;
+}
+
+struct hammer_thread_data
+{
+	pthread_t pthread_id;
+	int thread_nr;
+
+	int nr_requests;
+	const char *token;
+
+	int sum_successful;
+	int sum_errors;
+};
+
+static void *hammer_thread_proc(void *_hammer_thread_data)
+{
+	struct hammer_thread_data *data = _hammer_thread_data;
+	struct strbuf answer = STRBUF_INIT;
+	int k;
+	int ret;
+
+	trace2_thread_start("hammer");
+
+	for (k = 0; k < data->nr_requests; k++) {
+		strbuf_reset(&answer);
+
+		ret = fsmonitor_ipc__send_query(data->token, &answer);
+		if (ret < 0)
+			data->sum_errors++;
+		else
+			data->sum_successful++;
+	}
+
+	strbuf_release(&answer);
+	trace2_thread_exit();
+	return NULL;
+}
+
+/*
+ * Start a pool of client threads that will each send a series of
+ * commands to the daemon.
+ *
+ * The goal is to overload the daemon with a sustained series of
+ * concurrent requests.
+ */
+static int do_hammer(const char *token, int nr_threads, int nr_requests)
+{
+	struct hammer_thread_data *data = NULL;
+	int k;
+	int sum_join_errors = 0;
+	int sum_commands = 0;
+	int sum_errors = 0;
+
+	if (!token || !*token)
+		token = get_token_from_index();
+	if (nr_threads < 1)
+		nr_threads = 1;
+	if (nr_requests < 1)
+		nr_requests = 1;
+
+	CALLOC_ARRAY(data, nr_threads);
+
+	for (k = 0; k < nr_threads; k++) {
+		struct hammer_thread_data *p = &data[k];
+		p->thread_nr = k;
+		p->nr_requests = nr_requests;
+		p->token = token;
+
+		if (pthread_create(&p->pthread_id, NULL, hammer_thread_proc, p)) {
+			warning("failed to create thread[%d] skipping remainder", k);
+			nr_threads = k;
+			break;
+		}
+	}
+
+	for (k = 0; k < nr_threads; k++) {
+		struct hammer_thread_data *p = &data[k];
+
+		if (pthread_join(p->pthread_id, NULL))
+			sum_join_errors++;
+		sum_commands += p->sum_successful;
+		sum_errors += p->sum_errors;
+	}
+
+	fprintf(stderr, "HAMMER: [threads %d][requests %d] [ok %d][err %d][join %d]\n",
+		nr_threads, nr_requests, sum_commands, sum_errors, sum_join_errors);
+
+	free(data);
+
+	/*
+	 * Return an error if any of the _send_query requests failed.
+	 * We don't care about thread create/join errors.
+	 */
+	return sum_errors > 0;
+}
+
+int cmd__fsmonitor_client(int argc, const char **argv)
+{
+	const char *subcmd;
+	const char *token = NULL;
+	int nr_threads = 1;
+	int nr_requests = 1;
+
+	const char * const fsmonitor_client_usage[] = {
+		"test-tool fsmonitor-client query [<token>]",
+		"test-tool fsmonitor-client flush",
+		"test-tool fsmonitor-client hammer [<token>] [<threads>] [<requests>]",
+		NULL,
+	};
+
+	struct option options[] = {
+		OPT_STRING(0, "token", &token, "token",
+			   "command token to send to the server"),
+
+		OPT_INTEGER(0, "threads", &nr_threads, "number of client threads"),
+		OPT_INTEGER(0, "requests", &nr_requests, "number of requests per thread"),
+
+		OPT_END()
+	};
+
+	argc = parse_options(argc, argv, NULL, options, fsmonitor_client_usage, 0);
+
+	if (argc != 1)
+		usage_with_options(fsmonitor_client_usage, options);
+
+	subcmd = argv[0];
+
+	setup_git_directory();
+
+	if (!strcmp(subcmd, "query"))
+		return !!do_send_query(token);
+
+	if (!strcmp(subcmd, "flush"))
+		return !!do_send_flush();
+
+	if (!strcmp(subcmd, "hammer"))
+		return !!do_hammer(token, nr_threads, nr_requests);
+
+	die("Unhandled subcommand: '%s'", subcmd);
+}
+#endif
diff --git a/t/helper/test-genzeros.c b/t/helper/test-genzeros.c
index 9532f5b..47af843 100644
--- a/t/helper/test-genzeros.c
+++ b/t/helper/test-genzeros.c
@@ -3,18 +3,32 @@
 
 int cmd__genzeros(int argc, const char **argv)
 {
-	long count;
+	/* static, so that it is NUL-initialized */
+	static const char zeros[256 * 1024];
+	intmax_t count;
+	ssize_t n;
 
 	if (argc > 2) {
 		fprintf(stderr, "usage: %s [<count>]\n", argv[0]);
 		return 1;
 	}
 
-	count = argc > 1 ? strtol(argv[1], NULL, 0) : -1L;
+	count = argc > 1 ? strtoimax(argv[1], NULL, 0) : -1;
 
-	while (count < 0 || count--) {
-		if (putchar(0) == EOF)
-			return -1;
+	/* Writing out individual NUL bytes is slow... */
+	while (count < 0)
+		if (xwrite(1, zeros, ARRAY_SIZE(zeros)) < 0)
+			die_errno("write error");
+
+	while (count > 0) {
+		n = xwrite(1, zeros,
+			   count < ARRAY_SIZE(zeros)
+			   ? count : ARRAY_SIZE(zeros));
+
+		if (n < 0)
+			die_errno("write error");
+
+		count -= n;
 	}
 
 	return 0;
diff --git a/t/helper/test-getcwd.c b/t/helper/test-getcwd.c
new file mode 100644
index 0000000..d680038
--- /dev/null
+++ b/t/helper/test-getcwd.c
@@ -0,0 +1,26 @@
+#include "test-tool.h"
+#include "git-compat-util.h"
+#include "parse-options.h"
+
+static const char *getcwd_usage[] = {
+	"test-tool getcwd",
+	NULL
+};
+
+int cmd__getcwd(int argc, const char **argv)
+{
+	struct option options[] = {
+		OPT_END()
+	};
+	char *cwd;
+
+	argc = parse_options(argc, argv, "test-tools", options, getcwd_usage, 0);
+	if (argc > 0)
+		usage_with_options(getcwd_usage, options);
+
+	cwd = xgetcwd();
+	puts(cwd);
+	free(cwd);
+
+	return 0;
+}
diff --git a/t/helper/test-hash-speed.c b/t/helper/test-hash-speed.c
index 432233c..b235da5 100644
--- a/t/helper/test-hash-speed.c
+++ b/t/helper/test-hash-speed.c
@@ -1,5 +1,5 @@
 #include "test-tool.h"
-#include "cache.h"
+#include "hash-ll.h"
 
 #define NUM_SECONDS 3
 
@@ -57,5 +57,5 @@ int cmd__hash_speed(int ac, const char **av)
 		free(p);
 	}
 
-	exit(0);
+	return 0;
 }
diff --git a/t/helper/test-hash.c b/t/helper/test-hash.c
index 0a31de6..45d829c 100644
--- a/t/helper/test-hash.c
+++ b/t/helper/test-hash.c
@@ -1,5 +1,5 @@
 #include "test-tool.h"
-#include "cache.h"
+#include "hex.h"
 
 int cmd_hash_impl(int ac, const char **av, int algo)
 {
@@ -54,5 +54,6 @@ int cmd_hash_impl(int ac, const char **av, int algo)
 		fwrite(hash, 1, algop->rawsz, stdout);
 	else
 		puts(hash_to_hex_algop(hash, algop));
-	exit(0);
+	free(buffer);
+	return 0;
 }
diff --git a/t/helper/test-hashmap.c b/t/helper/test-hashmap.c
index f387062..0eb0b3d 100644
--- a/t/helper/test-hashmap.c
+++ b/t/helper/test-hashmap.c
@@ -2,6 +2,7 @@
 #include "git-compat-util.h"
 #include "hashmap.h"
 #include "strbuf.h"
+#include "string-list.h"
 
 struct test_entry
 {
@@ -110,7 +111,7 @@ static void perf_hashmap(unsigned int method, unsigned int rounds)
 				hashmap_add(&map, &entries[i]->ent);
 			}
 
-			hashmap_free(&map);
+			hashmap_clear(&map);
 		}
 	} else {
 		/* test map lookups */
@@ -130,7 +131,7 @@ static void perf_hashmap(unsigned int method, unsigned int rounds)
 			}
 		}
 
-		hashmap_free(&map);
+		hashmap_clear(&map);
 	}
 }
 
@@ -150,31 +151,36 @@ static void perf_hashmap(unsigned int method, unsigned int rounds)
  */
 int cmd__hashmap(int argc, const char **argv)
 {
+	struct string_list parts = STRING_LIST_INIT_NODUP;
 	struct strbuf line = STRBUF_INIT;
-	struct hashmap map;
 	int icase;
+	struct hashmap map = HASHMAP_INIT(test_entry_cmp, &icase);
 
 	/* init hash map */
 	icase = argc > 1 && !strcmp("ignorecase", argv[1]);
-	hashmap_init(&map, test_entry_cmp, &icase, 0);
 
 	/* process commands from stdin */
 	while (strbuf_getline(&line, stdin) != EOF) {
-		char *cmd, *p1 = NULL, *p2 = NULL;
+		char *cmd, *p1, *p2;
 		unsigned int hash = 0;
 		struct test_entry *entry;
 
 		/* break line into command and up to two parameters */
-		cmd = strtok(line.buf, DELIM);
+		string_list_setlen(&parts, 0);
+		string_list_split_in_place(&parts, line.buf, DELIM, 2);
+		string_list_remove_empty_items(&parts, 0);
+
 		/* ignore empty lines */
-		if (!cmd || *cmd == '#')
+		if (!parts.nr)
+			continue;
+		if (!*parts.items[0].string || *parts.items[0].string == '#')
 			continue;
 
-		p1 = strtok(NULL, DELIM);
-		if (p1) {
+		cmd = parts.items[0].string;
+		p1 = parts.nr >= 1 ? parts.items[1].string : NULL;
+		p2 = parts.nr >= 2 ? parts.items[2].string : NULL;
+		if (p1)
 			hash = icase ? strihash(p1) : strhash(p1);
-			p2 = strtok(NULL, DELIM);
-		}
 
 		if (!strcmp("add", cmd) && p1 && p2) {
 
@@ -261,7 +267,8 @@ int cmd__hashmap(int argc, const char **argv)
 		}
 	}
 
+	string_list_clear(&parts, 0);
 	strbuf_release(&line);
-	hashmap_free_entries(&map, struct test_entry, ent);
+	hashmap_clear_and_free(&map, struct test_entry, ent);
 	return 0;
 }
diff --git a/t/helper/test-hexdump.c b/t/helper/test-hexdump.c
new file mode 100644
index 0000000..05f55ec
--- /dev/null
+++ b/t/helper/test-hexdump.c
@@ -0,0 +1,30 @@
+#include "test-tool.h"
+#include "git-compat-util.h"
+
+/*
+ * Read stdin and print a hexdump to stdout.
+ */
+int cmd__hexdump(int argc UNUSED, const char **argv UNUSED)
+{
+	char buf[1024];
+	ssize_t i, len;
+	int have_data = 0;
+
+	for (;;) {
+		len = xread(0, buf, sizeof(buf));
+		if (len < 0)
+			die_errno("failure reading stdin");
+		if (!len)
+			break;
+
+		have_data = 1;
+
+		for (i = 0; i < len; i++)
+			printf("%02x ", (unsigned char)buf[i]);
+	}
+
+	if (have_data)
+		putchar('\n');
+
+	return 0;
+}
diff --git a/t/helper/test-index-version.c b/t/helper/test-index-version.c
deleted file mode 100644
index fcd1096..0000000
--- a/t/helper/test-index-version.c
+++ /dev/null
@@ -1,15 +0,0 @@
-#include "test-tool.h"
-#include "cache.h"
-
-int cmd__index_version(int argc, const char **argv)
-{
-	struct cache_header hdr;
-	int version;
-
-	memset(&hdr,0,sizeof(hdr));
-	if (read(0, &hdr, sizeof(hdr)) != sizeof(hdr))
-		return 0;
-	version = ntohl(hdr.hdr_version);
-	printf("%d\n", version);
-	return 0;
-}
diff --git a/t/helper/test-json-writer.c b/t/helper/test-json-writer.c
index 37c4525..afe393f 100644
--- a/t/helper/test-json-writer.c
+++ b/t/helper/test-json-writer.c
@@ -1,6 +1,6 @@
 #include "test-tool.h"
-#include "cache.h"
 #include "json-writer.h"
+#include "string-list.h"
 
 static const char *expect_obj1 = "{\"a\":\"abc\",\"b\":42,\"c\":true}";
 static const char *expect_obj2 = "{\"a\":-1,\"b\":2147483647,\"c\":0}";
@@ -181,12 +181,18 @@ static struct json_writer nest1 = JSON_WRITER_INIT;
 
 static void make_nest1(int pretty)
 {
+	make_obj1(0);
+	make_arr1(0);
+
 	jw_object_begin(&nest1, pretty);
 	{
 		jw_object_sub_jw(&nest1, "obj1", &obj1);
 		jw_object_sub_jw(&nest1, "arr1", &arr1);
 	}
 	jw_end(&nest1);
+
+	jw_release(&obj1);
+	jw_release(&arr1);
 }
 
 static char *expect_inline1 =
@@ -313,6 +319,9 @@ static void make_mixed1(int pretty)
 		jw_object_sub_jw(&mixed1, "arr1", &arr1);
 	}
 	jw_end(&mixed1);
+
+	jw_release(&obj1);
+	jw_release(&arr1);
 }
 
 static void cmp(const char *test, const struct json_writer *jw, const char *exp)
@@ -325,8 +334,8 @@ static void cmp(const char *test, const struct json_writer *jw, const char *exp)
 	exit(1);
 }
 
-#define t(v) do { make_##v(0); cmp(#v, &v, expect_##v); } while (0)
-#define p(v) do { make_##v(1); cmp(#v, &v, pretty_##v); } while (0)
+#define t(v) do { make_##v(0); cmp(#v, &v, expect_##v); jw_release(&v); } while (0)
+#define p(v) do { make_##v(1); cmp(#v, &v, pretty_##v); jw_release(&v); } while (0)
 
 /*
  * Run some basic regression tests with some known patterns.
@@ -381,41 +390,46 @@ static int unit_tests(void)
 
 	/* mixed forms */
 	t(mixed1);
-	jw_init(&mixed1);
 	p(mixed1);
 
 	return 0;
 }
 
-static void get_s(int line_nr, char **s_in)
+struct line {
+	struct string_list *parts;
+	size_t consumed_nr;
+	int nr;
+};
+
+static void get_s(struct line *line, char **s_in)
 {
-	*s_in = strtok(NULL, " ");
-	if (!*s_in)
-		die("line[%d]: expected: <s>", line_nr);
+	if (line->consumed_nr > line->parts->nr)
+		die("line[%d]: expected: <s>", line->nr);
+	*s_in = line->parts->items[line->consumed_nr++].string;
 }
 
-static void get_i(int line_nr, intmax_t *s_in)
+static void get_i(struct line *line, intmax_t *s_in)
 {
 	char *s;
 	char *endptr;
 
-	get_s(line_nr, &s);
+	get_s(line, &s);
 
 	*s_in = strtol(s, &endptr, 10);
 	if (*endptr || errno == ERANGE)
-		die("line[%d]: invalid integer value", line_nr);
+		die("line[%d]: invalid integer value", line->nr);
 }
 
-static void get_d(int line_nr, double *s_in)
+static void get_d(struct line *line, double *s_in)
 {
 	char *s;
 	char *endptr;
 
-	get_s(line_nr, &s);
+	get_s(line, &s);
 
 	*s_in = strtod(s, &endptr);
 	if (*endptr || errno == ERANGE)
-		die("line[%d]: invalid float value", line_nr);
+		die("line[%d]: invalid float value", line->nr);
 }
 
 static int pretty;
@@ -446,6 +460,7 @@ static char *get_trimmed_line(char *buf, int buf_size)
 
 static int scripted(void)
 {
+	struct string_list parts = STRING_LIST_INIT_NODUP;
 	struct json_writer jw = JSON_WRITER_INIT;
 	char buf[MAX_LINE_LENGTH];
 	char *line;
@@ -463,66 +478,77 @@ static int scripted(void)
 		die("expected first line to be 'object' or 'array'");
 
 	while ((line = get_trimmed_line(buf, MAX_LINE_LENGTH)) != NULL) {
+		struct line state = { 0 };
 		char *verb;
 		char *key;
 		char *s_value;
 		intmax_t i_value;
 		double d_value;
 
-		line_nr++;
+		state.parts = &parts;
+		state.nr = ++line_nr;
+
+		/* break line into command and zero or more tokens */
+		string_list_setlen(&parts, 0);
+		string_list_split_in_place(&parts, line, " ", -1);
+		string_list_remove_empty_items(&parts, 0);
+
+		/* ignore empty lines */
+		if (!parts.nr || !*parts.items[0].string)
+			continue;
 
-		verb = strtok(line, " ");
+		verb = parts.items[state.consumed_nr++].string;
 
 		if (!strcmp(verb, "end")) {
 			jw_end(&jw);
 		}
 		else if (!strcmp(verb, "object-string")) {
-			get_s(line_nr, &key);
-			get_s(line_nr, &s_value);
+			get_s(&state, &key);
+			get_s(&state, &s_value);
 			jw_object_string(&jw, key, s_value);
 		}
 		else if (!strcmp(verb, "object-int")) {
-			get_s(line_nr, &key);
-			get_i(line_nr, &i_value);
+			get_s(&state, &key);
+			get_i(&state, &i_value);
 			jw_object_intmax(&jw, key, i_value);
 		}
 		else if (!strcmp(verb, "object-double")) {
-			get_s(line_nr, &key);
-			get_i(line_nr, &i_value);
-			get_d(line_nr, &d_value);
+			get_s(&state, &key);
+			get_i(&state, &i_value);
+			get_d(&state, &d_value);
 			jw_object_double(&jw, key, i_value, d_value);
 		}
 		else if (!strcmp(verb, "object-true")) {
-			get_s(line_nr, &key);
+			get_s(&state, &key);
 			jw_object_true(&jw, key);
 		}
 		else if (!strcmp(verb, "object-false")) {
-			get_s(line_nr, &key);
+			get_s(&state, &key);
 			jw_object_false(&jw, key);
 		}
 		else if (!strcmp(verb, "object-null")) {
-			get_s(line_nr, &key);
+			get_s(&state, &key);
 			jw_object_null(&jw, key);
 		}
 		else if (!strcmp(verb, "object-object")) {
-			get_s(line_nr, &key);
+			get_s(&state, &key);
 			jw_object_inline_begin_object(&jw, key);
 		}
 		else if (!strcmp(verb, "object-array")) {
-			get_s(line_nr, &key);
+			get_s(&state, &key);
 			jw_object_inline_begin_array(&jw, key);
 		}
 		else if (!strcmp(verb, "array-string")) {
-			get_s(line_nr, &s_value);
+			get_s(&state, &s_value);
 			jw_array_string(&jw, s_value);
 		}
 		else if (!strcmp(verb, "array-int")) {
-			get_i(line_nr, &i_value);
+			get_i(&state, &i_value);
 			jw_array_intmax(&jw, i_value);
 		}
 		else if (!strcmp(verb, "array-double")) {
-			get_i(line_nr, &i_value);
-			get_d(line_nr, &d_value);
+			get_i(&state, &i_value);
+			get_d(&state, &d_value);
 			jw_array_double(&jw, i_value, d_value);
 		}
 		else if (!strcmp(verb, "array-true"))
@@ -544,7 +570,8 @@ static int scripted(void)
 
 	printf("%s\n", jw.json.buf);
 
-	strbuf_release(&jw.json);
+	jw_release(&jw);
+	string_list_clear(&parts, 0);
 	return 0;
 }
 
diff --git a/t/helper/test-lazy-init-name-hash.c b/t/helper/test-lazy-init-name-hash.c
index cd1b4c9..187a115 100644
--- a/t/helper/test-lazy-init-name-hash.c
+++ b/t/helper/test-lazy-init-name-hash.c
@@ -1,6 +1,12 @@
+#define USE_THE_INDEX_VARIABLE
 #include "test-tool.h"
-#include "cache.h"
+#include "environment.h"
+#include "name-hash.h"
 #include "parse-options.h"
+#include "read-cache-ll.h"
+#include "repository.h"
+#include "setup.h"
+#include "trace.h"
 
 static int single;
 static int multi;
@@ -32,7 +38,7 @@ static void dump_run(void)
 	struct dir_entry *dir;
 	struct cache_entry *ce;
 
-	read_cache();
+	repo_read_index(the_repository);
 	if (single) {
 		test_lazy_init_name_hash(&the_index, 0);
 	} else {
@@ -49,7 +55,7 @@ static void dump_run(void)
 				ent /* member name */)
 		printf("name %08x %s\n", ce->ent.hash, ce->name);
 
-	discard_cache();
+	discard_index(&the_index);
 }
 
 /*
@@ -66,7 +72,7 @@ static uint64_t time_runs(int try_threaded)
 
 	for (i = 0; i < count; i++) {
 		t0 = getnanotime();
-		read_cache();
+		repo_read_index(the_repository);
 		t1 = getnanotime();
 		nr_threads_used = test_lazy_init_name_hash(&the_index, try_threaded);
 		t2 = getnanotime();
@@ -89,7 +95,7 @@ static uint64_t time_runs(int try_threaded)
 				   the_index.cache_nr);
 		fflush(stdout);
 
-		discard_cache();
+		discard_index(&the_index);
 	}
 
 	avg = sum / count;
@@ -113,9 +119,9 @@ static void analyze_run(void)
 	int i;
 	int nr;
 
-	read_cache();
+	repo_read_index(the_repository);
 	cache_nr_limit = the_index.cache_nr;
-	discard_cache();
+	discard_index(&the_index);
 
 	nr = analyze;
 	while (1) {
@@ -128,23 +134,23 @@ static void analyze_run(void)
 			nr = cache_nr_limit;
 
 		for (i = 0; i < count; i++) {
-			read_cache();
+			repo_read_index(the_repository);
 			the_index.cache_nr = nr; /* cheap truncate of index */
 			t1s = getnanotime();
 			test_lazy_init_name_hash(&the_index, 0);
 			t2s = getnanotime();
 			sum_single += (t2s - t1s);
 			the_index.cache_nr = cache_nr_limit;
-			discard_cache();
+			discard_index(&the_index);
 
-			read_cache();
+			repo_read_index(the_repository);
 			the_index.cache_nr = nr; /* cheap truncate of index */
 			t1m = getnanotime();
 			nr_threads_used = test_lazy_init_name_hash(&the_index, 1);
 			t2m = getnanotime();
 			sum_multi += (t2m - t1m);
 			the_index.cache_nr = cache_nr_limit;
-			discard_cache();
+			discard_index(&the_index);
 
 			if (!nr_threads_used)
 				printf("    [size %8d] [single %f]   non-threaded code path used\n",
diff --git a/t/helper/test-line-buffer.c b/t/helper/test-line-buffer.c
deleted file mode 100644
index 078dd7e..0000000
--- a/t/helper/test-line-buffer.c
+++ /dev/null
@@ -1,81 +0,0 @@
-/*
- * test-line-buffer.c: code to exercise the svn importer's input helper
- */
-
-#include "git-compat-util.h"
-#include "strbuf.h"
-#include "vcs-svn/line_buffer.h"
-
-static uint32_t strtouint32(const char *s)
-{
-	char *end;
-	uintmax_t n = strtoumax(s, &end, 10);
-	if (*s == '\0' || *end != '\0')
-		die("invalid count: %s", s);
-	return (uint32_t) n;
-}
-
-static void handle_command(const char *command, const char *arg, struct line_buffer *buf)
-{
-	if (starts_with(command, "binary ")) {
-		struct strbuf sb = STRBUF_INIT;
-		strbuf_addch(&sb, '>');
-		buffer_read_binary(buf, &sb, strtouint32(arg));
-		fwrite(sb.buf, 1, sb.len, stdout);
-		strbuf_release(&sb);
-	} else if (starts_with(command, "copy ")) {
-		buffer_copy_bytes(buf, strtouint32(arg));
-	} else if (starts_with(command, "skip ")) {
-		buffer_skip_bytes(buf, strtouint32(arg));
-	} else {
-		die("unrecognized command: %s", command);
-	}
-}
-
-static void handle_line(const char *line, struct line_buffer *stdin_buf)
-{
-	const char *arg = strchr(line, ' ');
-	if (!arg)
-		die("no argument in line: %s", line);
-	handle_command(line, arg + 1, stdin_buf);
-}
-
-int cmd_main(int argc, const char **argv)
-{
-	struct line_buffer stdin_buf = LINE_BUFFER_INIT;
-	struct line_buffer file_buf = LINE_BUFFER_INIT;
-	struct line_buffer *input = &stdin_buf;
-	const char *filename;
-	char *s;
-
-	if (argc == 1)
-		filename = NULL;
-	else if (argc == 2)
-		filename = argv[1];
-	else
-		usage("test-line-buffer [file | &fd] < script");
-
-	if (buffer_init(&stdin_buf, NULL))
-		die_errno("open error");
-	if (filename) {
-		if (*filename == '&') {
-			if (buffer_fdinit(&file_buf, strtouint32(filename + 1)))
-				die_errno("error opening fd %s", filename + 1);
-		} else {
-			if (buffer_init(&file_buf, filename))
-				die_errno("error opening %s", filename);
-		}
-		input = &file_buf;
-	}
-
-	while ((s = buffer_read_line(&stdin_buf)))
-		handle_line(s, input);
-
-	if (filename && buffer_deinit(&file_buf))
-		die("error reading from %s", filename);
-	if (buffer_deinit(&stdin_buf))
-		die("input error");
-	if (ferror(stdout))
-		die("output error");
-	return 0;
-}
diff --git a/t/helper/test-match-trees.c b/t/helper/test-match-trees.c
index b9fd427..d0db5ff 100644
--- a/t/helper/test-match-trees.c
+++ b/t/helper/test-match-trees.c
@@ -1,17 +1,21 @@
 #include "test-tool.h"
-#include "cache.h"
+#include "hex.h"
+#include "match-trees.h"
+#include "object-name.h"
+#include "repository.h"
+#include "setup.h"
 #include "tree.h"
 
-int cmd__match_trees(int ac, const char **av)
+int cmd__match_trees(int ac UNUSED, const char **av)
 {
 	struct object_id hash1, hash2, shifted;
 	struct tree *one, *two;
 
 	setup_git_directory();
 
-	if (get_oid(av[1], &hash1))
+	if (repo_get_oid(the_repository, av[1], &hash1))
 		die("cannot parse %s as an object name", av[1]);
-	if (get_oid(av[2], &hash2))
+	if (repo_get_oid(the_repository, av[2], &hash2))
 		die("cannot parse %s as an object name", av[2]);
 	one = parse_tree_indirect(&hash1);
 	if (!one)
@@ -23,5 +27,5 @@ int cmd__match_trees(int ac, const char **av)
 	shift_tree(the_repository, &one->object.oid, &two->object.oid, &shifted, -1);
 	printf("shifted: %s\n", oid_to_hex(&shifted));
 
-	exit(0);
+	return 0;
 }
diff --git a/t/helper/test-mergesort.c b/t/helper/test-mergesort.c
index c5cffaa..42ccc87 100644
--- a/t/helper/test-mergesort.c
+++ b/t/helper/test-mergesort.c
@@ -1,53 +1,406 @@
 #include "test-tool.h"
-#include "cache.h"
+#include "mem-pool.h"
 #include "mergesort.h"
+#include "strbuf.h"
+
+static uint32_t minstd_rand(uint32_t *state)
+{
+	*state = (uint64_t)*state * 48271 % 2147483647;
+	return *state;
+}
 
 struct line {
 	char *text;
 	struct line *next;
 };
 
-static void *get_next(const void *a)
-{
-	return ((const struct line *)a)->next;
-}
-
-static void set_next(void *a, void *b)
-{
-	((struct line *)a)->next = b;
-}
+DEFINE_LIST_SORT(static, sort_lines, struct line, next);
 
-static int compare_strings(const void *a, const void *b)
+static int compare_strings(const struct line *x, const struct line *y)
 {
-	const struct line *x = a, *y = b;
 	return strcmp(x->text, y->text);
 }
 
-int cmd__mergesort(int argc, const char **argv)
+static int sort_stdin(void)
 {
-	struct line *line, *p = NULL, *lines = NULL;
+	struct line *lines;
+	struct line **tail = &lines;
 	struct strbuf sb = STRBUF_INIT;
+	struct mem_pool lines_pool;
+	char *p;
+
+	strbuf_read(&sb, 0, 0);
 
+	/*
+	 * Split by newline, but don't create an item
+	 * for the empty string after the last separator.
+	 */
+	if (sb.len && sb.buf[sb.len - 1] == '\n')
+		strbuf_setlen(&sb, sb.len - 1);
+
+	mem_pool_init(&lines_pool, 0);
+	p = sb.buf;
 	for (;;) {
-		if (strbuf_getwholeline(&sb, stdin, '\n'))
+		char *eol = strchr(p, '\n');
+		struct line *line = mem_pool_alloc(&lines_pool, sizeof(*line));
+		line->text = p;
+		*tail = line;
+		tail = &line->next;
+		if (!eol)
 			break;
-		line = xmalloc(sizeof(struct line));
-		line->text = strbuf_detach(&sb, NULL);
-		if (p) {
-			line->next = p->next;
-			p->next = line;
-		} else {
-			line->next = NULL;
-			lines = line;
-		}
-		p = line;
+		*eol = '\0';
+		p = eol + 1;
 	}
+	*tail = NULL;
 
-	lines = llist_mergesort(lines, get_next, set_next, compare_strings);
+	sort_lines(&lines, compare_strings);
 
 	while (lines) {
-		printf("%s", lines->text);
+		puts(lines->text);
 		lines = lines->next;
 	}
 	return 0;
 }
+
+static void dist_sawtooth(int *arr, int n, int m)
+{
+	int i;
+	for (i = 0; i < n; i++)
+		arr[i] = i % m;
+}
+
+static void dist_rand(int *arr, int n, int m)
+{
+	int i;
+	uint32_t seed = 1;
+	for (i = 0; i < n; i++)
+		arr[i] = minstd_rand(&seed) % m;
+}
+
+static void dist_stagger(int *arr, int n, int m)
+{
+	int i;
+	for (i = 0; i < n; i++)
+		arr[i] = (i * m + i) % n;
+}
+
+static void dist_plateau(int *arr, int n, int m)
+{
+	int i;
+	for (i = 0; i < n; i++)
+		arr[i] = (i < m) ? i : m;
+}
+
+static void dist_shuffle(int *arr, int n, int m)
+{
+	int i, j, k;
+	uint32_t seed = 1;
+	for (i = j = 0, k = 1; i < n; i++)
+		arr[i] = minstd_rand(&seed) % m ? (j += 2) : (k += 2);
+}
+
+#define DIST(name) { #name, dist_##name }
+
+static struct dist {
+	const char *name;
+	void (*fn)(int *arr, int n, int m);
+} dist[] = {
+	DIST(sawtooth),
+	DIST(rand),
+	DIST(stagger),
+	DIST(plateau),
+	DIST(shuffle),
+};
+
+static const struct dist *get_dist_by_name(const char *name)
+{
+	int i;
+	for (i = 0; i < ARRAY_SIZE(dist); i++) {
+	       if (!strcmp(dist[i].name, name))
+		       return &dist[i];
+	}
+	return NULL;
+}
+
+static void mode_copy(int *arr, int n)
+{
+	/* nothing */
+}
+
+static void mode_reverse(int *arr, int n)
+{
+	int i, j;
+	for (i = 0, j = n - 1; i < j; i++, j--)
+		SWAP(arr[i], arr[j]);
+}
+
+static void mode_reverse_1st_half(int *arr, int n)
+{
+	mode_reverse(arr, n / 2);
+}
+
+static void mode_reverse_2nd_half(int *arr, int n)
+{
+	int half = n / 2;
+	mode_reverse(arr + half, n - half);
+}
+
+static int compare_ints(const void *av, const void *bv)
+{
+	const int *ap = av, *bp = bv;
+	int a = *ap, b = *bp;
+	return (a > b) - (a < b);
+}
+
+static void mode_sort(int *arr, int n)
+{
+	QSORT(arr, n, compare_ints);
+}
+
+static void mode_dither(int *arr, int n)
+{
+	int i;
+	for (i = 0; i < n; i++)
+		arr[i] += i % 5;
+}
+
+static void unriffle(int *arr, int n, int *tmp)
+{
+	int i, j;
+	COPY_ARRAY(tmp, arr, n);
+	for (i = j = 0; i < n; i += 2)
+		arr[j++] = tmp[i];
+	for (i = 1; i < n; i += 2)
+		arr[j++] = tmp[i];
+}
+
+static void unriffle_recursively(int *arr, int n, int *tmp)
+{
+	if (n > 1) {
+		int half = n / 2;
+		unriffle(arr, n, tmp);
+		unriffle_recursively(arr, half, tmp);
+		unriffle_recursively(arr + half, n - half, tmp);
+	}
+}
+
+static void mode_unriffle(int *arr, int n)
+{
+	int *tmp;
+	ALLOC_ARRAY(tmp, n);
+	unriffle_recursively(arr, n, tmp);
+	free(tmp);
+}
+
+static unsigned int prev_pow2(unsigned int n)
+{
+	unsigned int pow2 = 1;
+	while (pow2 * 2 < n)
+		pow2 *= 2;
+	return pow2;
+}
+
+static void unriffle_recursively_skewed(int *arr, int n, int *tmp)
+{
+	if (n > 1) {
+		int pow2 = prev_pow2(n);
+		int rest = n - pow2;
+		unriffle(arr + pow2 - rest, rest * 2, tmp);
+		unriffle_recursively_skewed(arr, pow2, tmp);
+		unriffle_recursively_skewed(arr + pow2, rest, tmp);
+	}
+}
+
+static void mode_unriffle_skewed(int *arr, int n)
+{
+	int *tmp;
+	ALLOC_ARRAY(tmp, n);
+	unriffle_recursively_skewed(arr, n, tmp);
+	free(tmp);
+}
+
+#define MODE(name) { #name, mode_##name }
+
+static struct mode {
+	const char *name;
+	void (*fn)(int *arr, int n);
+} mode[] = {
+	MODE(copy),
+	MODE(reverse),
+	MODE(reverse_1st_half),
+	MODE(reverse_2nd_half),
+	MODE(sort),
+	MODE(dither),
+	MODE(unriffle),
+	MODE(unriffle_skewed),
+};
+
+static const struct mode *get_mode_by_name(const char *name)
+{
+	int i;
+	for (i = 0; i < ARRAY_SIZE(mode); i++) {
+	       if (!strcmp(mode[i].name, name))
+		       return &mode[i];
+	}
+	return NULL;
+}
+
+static int generate(int argc, const char **argv)
+{
+	const struct dist *dist = NULL;
+	const struct mode *mode = NULL;
+	int i, n, m, *arr;
+
+	if (argc != 4)
+		return 1;
+
+	dist = get_dist_by_name(argv[0]);
+	mode = get_mode_by_name(argv[1]);
+	n = strtol(argv[2], NULL, 10);
+	m = strtol(argv[3], NULL, 10);
+	if (!dist || !mode)
+		return 1;
+
+	ALLOC_ARRAY(arr, n);
+	dist->fn(arr, n, m);
+	mode->fn(arr, n);
+	for (i = 0; i < n; i++)
+		printf("%08x\n", arr[i]);
+	free(arr);
+	return 0;
+}
+
+static struct stats {
+	int get_next, set_next, compare;
+} stats;
+
+struct number {
+	int value, rank;
+	struct number *next;
+};
+
+DEFINE_LIST_SORT_DEBUG(static, sort_numbers, struct number, next,
+		       stats.get_next++, stats.set_next++);
+
+static int compare_numbers(const struct number *an, const struct number *bn)
+{
+	int a = an->value, b = bn->value;
+	stats.compare++;
+	return (a > b) - (a < b);
+}
+
+static void clear_numbers(struct number *list)
+{
+	while (list) {
+		struct number *next = list->next;
+		free(list);
+		list = next;
+	}
+}
+
+static int test(const struct dist *dist, const struct mode *mode, int n, int m)
+{
+	int *arr;
+	size_t i;
+	struct number *curr, *list, **tail;
+	int is_sorted = 1;
+	int is_stable = 1;
+	const char *verdict;
+	int result = -1;
+
+	ALLOC_ARRAY(arr, n);
+	dist->fn(arr, n, m);
+	mode->fn(arr, n);
+	for (i = 0, tail = &list; i < n; i++) {
+		curr = xmalloc(sizeof(*curr));
+		curr->value = arr[i];
+		curr->rank = i;
+		*tail = curr;
+		tail = &curr->next;
+	}
+	*tail = NULL;
+
+	stats.get_next = stats.set_next = stats.compare = 0;
+	sort_numbers(&list, compare_numbers);
+
+	QSORT(arr, n, compare_ints);
+	for (i = 0, curr = list; i < n && curr; i++, curr = curr->next) {
+		if (arr[i] != curr->value)
+			is_sorted = 0;
+		if (curr->next && curr->value == curr->next->value &&
+		    curr->rank >= curr->next->rank)
+			is_stable = 0;
+	}
+	if (i < n) {
+		verdict = "too short";
+	} else if (curr) {
+		verdict = "too long";
+	} else if (!is_sorted) {
+		verdict = "not sorted";
+	} else if (!is_stable) {
+		verdict = "unstable";
+	} else {
+		verdict = "OK";
+		result = 0;
+	}
+
+	printf("%-9s %-16s %8d %8d %8d %8d %8d %s\n",
+	       dist->name, mode->name, n, m, stats.get_next, stats.set_next,
+	       stats.compare, verdict);
+
+	clear_numbers(list);
+	free(arr);
+
+	return result;
+}
+
+/*
+ * A version of the qsort certification program from "Engineering a Sort
+ * Function" by Bentley and McIlroy, Software—Practice and Experience,
+ * Volume 23, Issue 11, 1249–1265 (November 1993).
+ */
+static int run_tests(int argc, const char **argv)
+{
+	const char *argv_default[] = { "100", "1023", "1024", "1025" };
+	if (!argc)
+		return run_tests(ARRAY_SIZE(argv_default), argv_default);
+	printf("%-9s %-16s %8s %8s %8s %8s %8s %s\n",
+	       "distribut", "mode", "n", "m", "get_next", "set_next",
+	       "compare", "verdict");
+	while (argc--) {
+		int i, j, m, n = strtol(*argv++, NULL, 10);
+		for (i = 0; i < ARRAY_SIZE(dist); i++) {
+			for (j = 0; j < ARRAY_SIZE(mode); j++) {
+				for (m = 1; m < 2 * n; m *= 2) {
+					if (test(&dist[i], &mode[j], n, m))
+						return 1;
+				}
+			}
+		}
+	}
+	return 0;
+}
+
+int cmd__mergesort(int argc, const char **argv)
+{
+	int i;
+	const char *sep;
+
+	if (argc == 6 && !strcmp(argv[1], "generate"))
+		return generate(argc - 2, argv + 2);
+	if (argc == 2 && !strcmp(argv[1], "sort"))
+		return sort_stdin();
+	if (argc > 1 && !strcmp(argv[1], "test"))
+		return run_tests(argc - 2, argv + 2);
+	fprintf(stderr, "usage: test-tool mergesort generate <distribution> <mode> <n> <m>\n");
+	fprintf(stderr, "   or: test-tool mergesort sort\n");
+	fprintf(stderr, "   or: test-tool mergesort test [<n>...]\n");
+	fprintf(stderr, "\n");
+	for (i = 0, sep = "distributions: "; i < ARRAY_SIZE(dist); i++, sep = ", ")
+		fprintf(stderr, "%s%s", sep, dist[i].name);
+	fprintf(stderr, "\n");
+	for (i = 0, sep = "modes: "; i < ARRAY_SIZE(mode); i++, sep = ", ")
+		fprintf(stderr, "%s%s", sep, mode[i].name);
+	fprintf(stderr, "\n");
+	return 129;
+}
diff --git a/t/helper/test-oid-array.c b/t/helper/test-oid-array.c
index b16cd0b..aafe398 100644
--- a/t/helper/test-oid-array.c
+++ b/t/helper/test-oid-array.c
@@ -1,14 +1,16 @@
 #include "test-tool.h"
-#include "cache.h"
+#include "hex.h"
 #include "oid-array.h"
+#include "setup.h"
+#include "strbuf.h"
 
-static int print_oid(const struct object_id *oid, void *data)
+static int print_oid(const struct object_id *oid, void *data UNUSED)
 {
 	puts(oid_to_hex(oid));
 	return 0;
 }
 
-int cmd__oid_array(int argc, const char **argv)
+int cmd__oid_array(int argc UNUSED, const char **argv UNUSED)
 {
 	struct oid_array array = OID_ARRAY_INIT;
 	struct strbuf line = STRBUF_INIT;
@@ -35,5 +37,9 @@ int cmd__oid_array(int argc, const char **argv)
 		else
 			die("unknown command: %s", line.buf);
 	}
+
+	strbuf_release(&line);
+	oid_array_clear(&array);
+
 	return 0;
 }
diff --git a/t/helper/test-oidmap.c b/t/helper/test-oidmap.c
index 0acf999..bd30244 100644
--- a/t/helper/test-oidmap.c
+++ b/t/helper/test-oidmap.c
@@ -1,7 +1,11 @@
 #include "test-tool.h"
-#include "cache.h"
+#include "hex.h"
+#include "object-name.h"
 #include "oidmap.h"
+#include "repository.h"
+#include "setup.h"
 #include "strbuf.h"
+#include "string-list.h"
 
 /* key is an oid and value is a name (could be a refname for example) */
 struct test_entry {
@@ -21,8 +25,9 @@ struct test_entry {
  * iterate -> oidkey1 namevalue1\noidkey2 namevalue2\n...
  *
  */
-int cmd__oidmap(int argc, const char **argv)
+int cmd__oidmap(int argc UNUSED, const char **argv UNUSED)
 {
+	struct string_list parts = STRING_LIST_INIT_NODUP;
 	struct strbuf line = STRBUF_INIT;
 	struct oidmap map = OIDMAP_INIT;
 
@@ -33,23 +38,28 @@ int cmd__oidmap(int argc, const char **argv)
 
 	/* process commands from stdin */
 	while (strbuf_getline(&line, stdin) != EOF) {
-		char *cmd, *p1 = NULL, *p2 = NULL;
+		char *cmd, *p1, *p2;
 		struct test_entry *entry;
 		struct object_id oid;
 
 		/* break line into command and up to two parameters */
-		cmd = strtok(line.buf, DELIM);
+		string_list_setlen(&parts, 0);
+		string_list_split_in_place(&parts, line.buf, DELIM, 2);
+		string_list_remove_empty_items(&parts, 0);
+
 		/* ignore empty lines */
-		if (!cmd || *cmd == '#')
+		if (!parts.nr)
+			continue;
+		if (!*parts.items[0].string || *parts.items[0].string == '#')
 			continue;
 
-		p1 = strtok(NULL, DELIM);
-		if (p1)
-			p2 = strtok(NULL, DELIM);
+		cmd = parts.items[0].string;
+		p1 = parts.nr >= 1 ? parts.items[1].string : NULL;
+		p2 = parts.nr >= 2 ? parts.items[2].string : NULL;
 
 		if (!strcmp("put", cmd) && p1 && p2) {
 
-			if (get_oid(p1, &oid)) {
+			if (repo_get_oid(the_repository, p1, &oid)) {
 				printf("Unknown oid: %s\n", p1);
 				continue;
 			}
@@ -67,7 +77,7 @@ int cmd__oidmap(int argc, const char **argv)
 
 		} else if (!strcmp("get", cmd) && p1) {
 
-			if (get_oid(p1, &oid)) {
+			if (repo_get_oid(the_repository, p1, &oid)) {
 				printf("Unknown oid: %s\n", p1);
 				continue;
 			}
@@ -80,7 +90,7 @@ int cmd__oidmap(int argc, const char **argv)
 
 		} else if (!strcmp("remove", cmd) && p1) {
 
-			if (get_oid(p1, &oid)) {
+			if (repo_get_oid(the_repository, p1, &oid)) {
 				printf("Unknown oid: %s\n", p1);
 				continue;
 			}
@@ -106,6 +116,7 @@ int cmd__oidmap(int argc, const char **argv)
 		}
 	}
 
+	string_list_clear(&parts, 0);
 	strbuf_release(&line);
 	oidmap_free(&map, 1);
 	return 0;
diff --git a/t/helper/test-oidtree.c b/t/helper/test-oidtree.c
new file mode 100644
index 0000000..c7a1d4c
--- /dev/null
+++ b/t/helper/test-oidtree.c
@@ -0,0 +1,54 @@
+#include "test-tool.h"
+#include "hex.h"
+#include "oidtree.h"
+#include "setup.h"
+#include "strbuf.h"
+
+static enum cb_next print_oid(const struct object_id *oid, void *data UNUSED)
+{
+	puts(oid_to_hex(oid));
+	return CB_CONTINUE;
+}
+
+int cmd__oidtree(int argc UNUSED, const char **argv UNUSED)
+{
+	struct oidtree ot;
+	struct strbuf line = STRBUF_INIT;
+	int nongit_ok;
+	int algo = GIT_HASH_UNKNOWN;
+
+	oidtree_init(&ot);
+	setup_git_directory_gently(&nongit_ok);
+
+	while (strbuf_getline(&line, stdin) != EOF) {
+		const char *arg;
+		struct object_id oid;
+
+		if (skip_prefix(line.buf, "insert ", &arg)) {
+			if (get_oid_hex_any(arg, &oid) == GIT_HASH_UNKNOWN)
+				die("insert not a hexadecimal oid: %s", arg);
+			algo = oid.algo;
+			oidtree_insert(&ot, &oid);
+		} else if (skip_prefix(line.buf, "contains ", &arg)) {
+			if (get_oid_hex(arg, &oid))
+				die("contains not a hexadecimal oid: %s", arg);
+			printf("%d\n", oidtree_contains(&ot, &oid));
+		} else if (skip_prefix(line.buf, "each ", &arg)) {
+			char buf[GIT_MAX_HEXSZ + 1] = { '0' };
+			memset(&oid, 0, sizeof(oid));
+			memcpy(buf, arg, strlen(arg));
+			buf[hash_algos[algo].hexsz] = '\0';
+			get_oid_hex_any(buf, &oid);
+			oid.algo = algo;
+			oidtree_each(&ot, &oid, strlen(arg), print_oid, NULL);
+		} else if (!strcmp(line.buf, "clear")) {
+			oidtree_clear(&ot);
+		} else {
+			die("unknown command: %s", line.buf);
+		}
+	}
+
+	strbuf_release(&line);
+
+	return 0;
+}
diff --git a/t/helper/test-online-cpus.c b/t/helper/test-online-cpus.c
index 8cb0d53..47dc211 100644
--- a/t/helper/test-online-cpus.c
+++ b/t/helper/test-online-cpus.c
@@ -2,7 +2,7 @@
 #include "git-compat-util.h"
 #include "thread-utils.h"
 
-int cmd__online_cpus(int argc, const char **argv)
+int cmd__online_cpus(int argc UNUSED, const char **argv UNUSED)
 {
 	printf("%d\n", online_cpus());
 	return 0;
diff --git a/t/helper/test-pack-mtimes.c b/t/helper/test-pack-mtimes.c
new file mode 100644
index 0000000..67a964e
--- /dev/null
+++ b/t/helper/test-pack-mtimes.c
@@ -0,0 +1,57 @@
+#include "test-tool.h"
+#include "hex.h"
+#include "strbuf.h"
+#include "object-store-ll.h"
+#include "packfile.h"
+#include "pack-mtimes.h"
+#include "setup.h"
+
+static void dump_mtimes(struct packed_git *p)
+{
+	uint32_t i;
+	if (load_pack_mtimes(p) < 0)
+		die("could not load pack .mtimes");
+
+	for (i = 0; i < p->num_objects; i++) {
+		struct object_id oid;
+		if (nth_packed_object_id(&oid, p, i) < 0)
+			die("could not load object id at position %"PRIu32, i);
+
+		printf("%s %"PRIu32"\n",
+		       oid_to_hex(&oid), nth_packed_mtime(p, i));
+	}
+}
+
+static const char *pack_mtimes_usage = "\n"
+"  test-tool pack-mtimes <pack-name.mtimes>";
+
+int cmd__pack_mtimes(int argc, const char **argv)
+{
+	struct strbuf buf = STRBUF_INIT;
+	struct packed_git *p;
+
+	setup_git_directory();
+
+	if (argc != 2)
+		usage(pack_mtimes_usage);
+
+	for (p = get_all_packs(the_repository); p; p = p->next) {
+		strbuf_addstr(&buf, basename(p->pack_name));
+		strbuf_strip_suffix(&buf, ".pack");
+		strbuf_addstr(&buf, ".mtimes");
+
+		if (!strcmp(buf.buf, argv[1]))
+			break;
+
+		strbuf_reset(&buf);
+	}
+
+	strbuf_release(&buf);
+
+	if (!p)
+		die("could not find pack '%s'", argv[1]);
+
+	dump_mtimes(p);
+
+	return 0;
+}
diff --git a/t/helper/test-parse-options.c b/t/helper/test-parse-options.c
index 2051ce5..ded8116 100644
--- a/t/helper/test-parse-options.c
+++ b/t/helper/test-parse-options.c
@@ -1,6 +1,6 @@
 #include "test-tool.h"
-#include "cache.h"
 #include "parse-options.h"
+#include "strbuf.h"
 #include "string-list.h"
 #include "trace2.h"
 
@@ -14,7 +14,6 @@ static int dry_run = 0, quiet = 0;
 static char *string = NULL;
 static char *file = NULL;
 static int ambiguous;
-static struct string_list list = STRING_LIST_INIT_NODUP;
 
 static struct {
 	int called;
@@ -22,6 +21,19 @@ static struct {
 	int unset;
 } length_cb;
 
+static int mode34_callback(const struct option *opt, const char *arg, int unset)
+{
+	if (unset)
+		*(int *)opt->value = 0;
+	else if (!strcmp(arg, "3"))
+		*(int *)opt->value = 3;
+	else if (!strcmp(arg, "4"))
+		*(int *)opt->value = 4;
+	else
+		return error("invalid value for '%s': '%s'", "--mode34", arg);
+	return 0;
+}
+
 static int length_callback(const struct option *opt, const char *arg, int unset)
 {
 	length_cb.called = 1;
@@ -107,6 +119,8 @@ int cmd__parse_options(int argc, const char **argv)
 		NULL
 	};
 	struct string_list expect = STRING_LIST_INIT_NODUP;
+	struct string_list list = STRING_LIST_INIT_NODUP;
+
 	struct option options[] = {
 		OPT_BOOL(0, "yes", &boolean, "get a boolean"),
 		OPT_BOOL('D', "no-doubt", &boolean, "begins with 'no-'"),
@@ -123,6 +137,9 @@ int cmd__parse_options(int argc, const char **argv)
 		OPT_SET_INT(0, "set23", &integer, "set integer to 23", 23),
 		OPT_CMDMODE(0, "mode1", &integer, "set integer to 1 (cmdmode option)", 1),
 		OPT_CMDMODE(0, "mode2", &integer, "set integer to 2 (cmdmode option)", 2),
+		OPT_CALLBACK_F(0, "mode34", &integer, "(3|4)",
+			"set integer to 3 or 4 (cmdmode option)",
+			PARSE_OPT_CMDMODE, mode34_callback),
 		OPT_CALLBACK('L', "length", &integer, "str",
 			"get length of <str>", length_callback),
 		OPT_FILENAME('F', "file", &file, "set file to <file>"),
@@ -132,9 +149,10 @@ int cmd__parse_options(int argc, const char **argv)
 		OPT_STRING(0, "st", &string, "st", "get another string (pervert ordering)"),
 		OPT_STRING('o', NULL, &string, "str", "get another string"),
 		OPT_NOOP_NOARG(0, "obsolete"),
+		OPT_SET_INT_F(0, "longhelp", &integer, "help text of this entry\n"
+			      "spans multiple lines", 0, PARSE_OPT_NONEG),
 		OPT_STRING_LIST(0, "list", &list, "str", "add str to list"),
 		OPT_GROUP("Magic arguments"),
-		OPT_ARGUMENT("quux", NULL, "means --quux"),
 		OPT_NUMBER_CALLBACK(&integer, "set integer to NUM",
 			number_callback),
 		{ OPTION_COUNTUP, '+', NULL, &boolean, NULL, "same as -b",
@@ -186,5 +204,137 @@ int cmd__parse_options(int argc, const char **argv)
 	for (i = 0; i < argc; i++)
 		show(&expect, &ret, "arg %02d: %s", i, argv[i]);
 
+	expect.strdup_strings = 1;
+	string_list_clear(&expect, 0);
+	string_list_clear(&list, 0);
+
 	return ret;
 }
+
+static void print_args(int argc, const char **argv)
+{
+	int i;
+	for (i = 0; i < argc; i++)
+		printf("arg %02d: %s\n", i, argv[i]);
+}
+
+static int parse_options_flags__cmd(int argc, const char **argv,
+				    enum parse_opt_flags test_flags)
+{
+	const char *usage[] = {
+		"<...> cmd [options]",
+		NULL
+	};
+	int opt = 0;
+	const struct option options[] = {
+		OPT_INTEGER('o', "opt", &opt, "an integer option"),
+		OPT_END()
+	};
+
+	argc = parse_options(argc, argv, NULL, options, usage, test_flags);
+
+	printf("opt: %d\n", opt);
+	print_args(argc, argv);
+
+	return 0;
+}
+
+static enum parse_opt_flags test_flags = 0;
+static const struct option test_flag_options[] = {
+	OPT_GROUP("flag-options:"),
+	OPT_BIT(0, "keep-dashdash", &test_flags,
+		"pass PARSE_OPT_KEEP_DASHDASH to parse_options()",
+		PARSE_OPT_KEEP_DASHDASH),
+	OPT_BIT(0, "stop-at-non-option", &test_flags,
+		"pass PARSE_OPT_STOP_AT_NON_OPTION to parse_options()",
+		PARSE_OPT_STOP_AT_NON_OPTION),
+	OPT_BIT(0, "keep-argv0", &test_flags,
+		"pass PARSE_OPT_KEEP_ARGV0 to parse_options()",
+		PARSE_OPT_KEEP_ARGV0),
+	OPT_BIT(0, "keep-unknown-opt", &test_flags,
+		"pass PARSE_OPT_KEEP_UNKNOWN_OPT to parse_options()",
+		PARSE_OPT_KEEP_UNKNOWN_OPT),
+	OPT_BIT(0, "no-internal-help", &test_flags,
+		"pass PARSE_OPT_NO_INTERNAL_HELP to parse_options()",
+		PARSE_OPT_NO_INTERNAL_HELP),
+	OPT_BIT(0, "subcommand-optional", &test_flags,
+		"pass PARSE_OPT_SUBCOMMAND_OPTIONAL to parse_options()",
+		PARSE_OPT_SUBCOMMAND_OPTIONAL),
+	OPT_END()
+};
+
+int cmd__parse_options_flags(int argc, const char **argv)
+{
+	const char *usage[] = {
+		"test-tool parse-options-flags [flag-options] cmd [options]",
+		NULL
+	};
+
+	argc = parse_options(argc, argv, NULL, test_flag_options, usage,
+			     PARSE_OPT_STOP_AT_NON_OPTION);
+
+	if (!argc || strcmp(argv[0], "cmd")) {
+		error("'cmd' is mandatory");
+		usage_with_options(usage, test_flag_options);
+	}
+
+	return parse_options_flags__cmd(argc, argv, test_flags);
+}
+
+static int subcmd_one(int argc, const char **argv, const char *prefix UNUSED)
+{
+	printf("fn: subcmd_one\n");
+	print_args(argc, argv);
+	return 0;
+}
+
+static int subcmd_two(int argc, const char **argv, const char *prefix UNUSED)
+{
+	printf("fn: subcmd_two\n");
+	print_args(argc, argv);
+	return 0;
+}
+
+static int parse_subcommand__cmd(int argc, const char **argv,
+				 enum parse_opt_flags test_flags)
+{
+	const char *usage[] = {
+		"<...> cmd subcmd-one",
+		"<...> cmd subcmd-two",
+		NULL
+	};
+	parse_opt_subcommand_fn *fn = NULL;
+	int opt = 0;
+	struct option options[] = {
+		OPT_SUBCOMMAND("subcmd-one", &fn, subcmd_one),
+		OPT_SUBCOMMAND("subcmd-two", &fn, subcmd_two),
+		OPT_INTEGER('o', "opt", &opt, "an integer option"),
+		OPT_END()
+	};
+
+	if (test_flags & PARSE_OPT_SUBCOMMAND_OPTIONAL)
+		fn = subcmd_one;
+	argc = parse_options(argc, argv, NULL, options, usage, test_flags);
+
+	printf("opt: %d\n", opt);
+
+	return fn(argc, argv, NULL);
+}
+
+int cmd__parse_subcommand(int argc, const char **argv)
+{
+	const char *usage[] = {
+		"test-tool parse-subcommand [flag-options] cmd <subcommand>",
+		NULL
+	};
+
+	argc = parse_options(argc, argv, NULL, test_flag_options, usage,
+			     PARSE_OPT_STOP_AT_NON_OPTION);
+
+	if (!argc || strcmp(argv[0], "cmd")) {
+		error("'cmd' is mandatory");
+		usage_with_options(usage, test_flag_options);
+	}
+
+	return parse_subcommand__cmd(argc, argv, test_flags);
+}
diff --git a/t/helper/test-parse-pathspec-file.c b/t/helper/test-parse-pathspec-file.c
index b3e08ce..89ecefd 100644
--- a/t/helper/test-parse-pathspec-file.c
+++ b/t/helper/test-parse-pathspec-file.c
@@ -1,12 +1,11 @@
 #include "test-tool.h"
 #include "parse-options.h"
 #include "pathspec.h"
-#include "gettext.h"
 
 int cmd__parse_pathspec_file(int argc, const char **argv)
 {
 	struct pathspec pathspec;
-	const char *pathspec_from_file = NULL;
+	char *pathspec_from_file = NULL;
 	int pathspec_file_nul = 0, i;
 
 	static const char *const usage[] = {
@@ -29,5 +28,6 @@ int cmd__parse_pathspec_file(int argc, const char **argv)
 		printf("%s\n", pathspec.items[i].original);
 
 	clear_pathspec(&pathspec);
+	free(pathspec_from_file);
 	return 0;
 }
diff --git a/t/helper/test-partial-clone.c b/t/helper/test-partial-clone.c
new file mode 100644
index 0000000..910a128
--- /dev/null
+++ b/t/helper/test-partial-clone.c
@@ -0,0 +1,44 @@
+#include "test-tool.h"
+#include "hex.h"
+#include "repository.h"
+#include "object-store-ll.h"
+#include "setup.h"
+
+/*
+ * Prints the size of the object corresponding to the given hash in a specific
+ * gitdir. This is similar to "git -C gitdir cat-file -s", except that this
+ * exercises the code that accesses the object of an arbitrary repository that
+ * is not the_repository. ("git -C gitdir" makes it so that the_repository is
+ * the one in gitdir.)
+ */
+static void object_info(const char *gitdir, const char *oid_hex)
+{
+	struct repository r;
+	struct object_id oid;
+	unsigned long size;
+	struct object_info oi = {.sizep = &size};
+	const char *p;
+
+	if (repo_init(&r, gitdir, NULL))
+		die("could not init repo");
+	if (parse_oid_hex(oid_hex, &oid, &p))
+		die("could not parse oid");
+	if (oid_object_info_extended(&r, &oid, &oi, 0))
+		die("could not obtain object info");
+	printf("%d\n", (int) size);
+}
+
+int cmd__partial_clone(int argc, const char **argv)
+{
+	setup_git_directory();
+
+	if (argc < 4)
+		die("too few arguments");
+
+	if (!strcmp(argv[1], "object-info"))
+		object_info(argv[2], argv[3]);
+	else
+		die("invalid argument '%s'", argv[1]);
+
+	return 0;
+}
diff --git a/t/helper/test-path-utils.c b/t/helper/test-path-utils.c
index 313a153..70396fa 100644
--- a/t/helper/test-path-utils.c
+++ b/t/helper/test-path-utils.c
@@ -1,6 +1,11 @@
 #include "test-tool.h"
-#include "cache.h"
+#include "abspath.h"
+#include "environment.h"
+#include "path.h"
+#include "read-cache-ll.h"
+#include "setup.h"
 #include "string-list.h"
+#include "trace.h"
 #include "utf8.h"
 
 /*
@@ -8,7 +13,8 @@
  * GIT_CEILING_DIRECTORIES.  If the path is unusable for some reason,
  * die with an explanation.
  */
-static int normalize_ceiling_entry(struct string_list_item *item, void *unused)
+static int normalize_ceiling_entry(struct string_list_item *item,
+				   void *data UNUSED)
 {
 	char *ceil = item->string;
 
@@ -172,9 +178,22 @@ static struct test_data dirname_data[] = {
 	{ NULL,              NULL     }
 };
 
-static int is_dotgitmodules(const char *path)
+static int check_dotfile(const char *x, const char **argv,
+			 int (*is_hfs)(const char *),
+			 int (*is_ntfs)(const char *))
 {
-	return is_hfs_dotgitmodules(path) || is_ntfs_dotgitmodules(path);
+	int res = 0, expect = 1;
+	for (; *argv; argv++) {
+		if (!strcmp("--not", *argv))
+			expect = !expect;
+		else if (expect != (is_hfs(*argv) || is_ntfs(*argv)))
+			res = error("'%s' is %s.git%s", *argv,
+				    expect ? "not " : "", x);
+		else
+			fprintf(stderr, "ok: '%s' is %s.git%s\n",
+				*argv, expect ? "" : "not ", x);
+	}
+	return !!res;
 }
 
 static int cmp_by_st_size(const void *a, const void *b)
@@ -283,9 +302,8 @@ int cmd__path_utils(int argc, const char **argv)
 	if (argc == 3 && !strcmp(argv[1], "normalize_path_copy")) {
 		char *buf = xmallocz(strlen(argv[2]));
 		int rv = normalize_path_copy(buf, argv[2]);
-		if (rv)
-			buf = "++failed++";
-		puts(buf);
+		puts(rv ? "++failed++" : buf);
+		free(buf);
 		return 0;
 	}
 
@@ -343,7 +361,10 @@ int cmd__path_utils(int argc, const char **argv)
 		int nongit_ok;
 		setup_git_directory_gently(&nongit_ok);
 		while (argc > 3) {
-			puts(prefix_path(prefix, prefix_len, argv[3]));
+			char *pfx = prefix_path(prefix, prefix_len, argv[3]);
+
+			puts(pfx);
+			free(pfx);
 			argc--;
 			argv++;
 		}
@@ -353,6 +374,7 @@ int cmd__path_utils(int argc, const char **argv)
 	if (argc == 4 && !strcmp(argv[1], "strip_path_suffix")) {
 		char *prefix = strip_path_suffix(argv[2], argv[3]);
 		printf("%s\n", prefix ? prefix : "(null)");
+		free(prefix);
 		return 0;
 	}
 
@@ -382,17 +404,24 @@ int cmd__path_utils(int argc, const char **argv)
 		return test_function(dirname_data, posix_dirname, argv[1]);
 
 	if (argc > 2 && !strcmp(argv[1], "is_dotgitmodules")) {
-		int res = 0, expect = 1, i;
-		for (i = 2; i < argc; i++)
-			if (!strcmp("--not", argv[i]))
-				expect = !expect;
-			else if (expect != is_dotgitmodules(argv[i]))
-				res = error("'%s' is %s.gitmodules", argv[i],
-					    expect ? "not " : "");
-			else
-				fprintf(stderr, "ok: '%s' is %s.gitmodules\n",
-					argv[i], expect ? "" : "not ");
-		return !!res;
+		return check_dotfile("modules", argv + 2,
+				     is_hfs_dotgitmodules,
+				     is_ntfs_dotgitmodules);
+	}
+	if (argc > 2 && !strcmp(argv[1], "is_dotgitignore")) {
+		return check_dotfile("ignore", argv + 2,
+				     is_hfs_dotgitignore,
+				     is_ntfs_dotgitignore);
+	}
+	if (argc > 2 && !strcmp(argv[1], "is_dotgitattributes")) {
+		return check_dotfile("attributes", argv + 2,
+				     is_hfs_dotgitattributes,
+				     is_ntfs_dotgitattributes);
+	}
+	if (argc > 2 && !strcmp(argv[1], "is_dotmailmap")) {
+		return check_dotfile("mailmap", argv + 2,
+				     is_hfs_dotmailmap,
+				     is_ntfs_dotmailmap);
 	}
 
 	if (argc > 2 && !strcmp(argv[1], "file-size")) {
diff --git a/t/helper/test-pcre2-config.c b/t/helper/test-pcre2-config.c
new file mode 100644
index 0000000..5d0b2a2
--- /dev/null
+++ b/t/helper/test-pcre2-config.c
@@ -0,0 +1,11 @@
+#include "test-tool.h"
+#include "grep.h"
+
+int cmd__pcre2_config(int argc, const char **argv)
+{
+	if (argc == 2 && !strcmp(argv[1], "has-PCRE2_MATCH_INVALID_UTF")) {
+		int value = PCRE2_MATCH_INVALID_UTF;
+		return !value;
+	}
+	return 1;
+}
diff --git a/t/helper/test-pkt-line.c b/t/helper/test-pkt-line.c
index 6915295..4daa82f 100644
--- a/t/helper/test-pkt-line.c
+++ b/t/helper/test-pkt-line.c
@@ -1,6 +1,9 @@
-#include "cache.h"
+#include "git-compat-util.h"
 #include "test-tool.h"
 #include "pkt-line.h"
+#include "sideband.h"
+#include "write-or-die.h"
+#include "parse-options.h"
 
 static void pack_line(const char *line)
 {
@@ -26,6 +29,16 @@ static void pack(int argc, const char **argv)
 	}
 }
 
+static void pack_raw_stdin(void)
+{
+	struct strbuf sb = STRBUF_INIT;
+
+	if (strbuf_read(&sb, 0, 0) < 0)
+		die_errno("failed to read from stdin");
+	packet_write(1, sb.buf, sb.len);
+	strbuf_release(&sb);
+}
+
 static void unpack(void)
 {
 	struct packet_reader reader;
@@ -53,12 +66,33 @@ static void unpack(void)
 	}
 }
 
-static void unpack_sideband(void)
+static void unpack_sideband(int argc, const char **argv)
 {
 	struct packet_reader reader;
-	packet_reader_init(&reader, 0, NULL, 0,
-			   PACKET_READ_GENTLE_ON_EOF |
-			   PACKET_READ_CHOMP_NEWLINE);
+	int options = PACKET_READ_GENTLE_ON_EOF;
+	int chomp_newline = 1;
+	int reader_use_sideband = 0;
+	const char *const unpack_sideband_usage[] = {
+		"test_tool unpack_sideband [options...]", NULL
+	};
+	struct option cmd_options[] = {
+		OPT_BOOL(0, "reader-use-sideband", &reader_use_sideband,
+			 "set use_sideband bit for packet reader (Default: off)"),
+		OPT_BOOL(0, "chomp-newline", &chomp_newline,
+			 "chomp newline in packet (Default: on)"),
+		OPT_END()
+	};
+
+	argc = parse_options(argc, argv, "", cmd_options, unpack_sideband_usage,
+			     0);
+	if (argc > 0)
+		usage_msg_opt(_("too many arguments"), unpack_sideband_usage,
+			      cmd_options);
+
+	if (chomp_newline)
+		options |= PACKET_READ_CHOMP_NEWLINE;
+	packet_reader_init(&reader, 0, NULL, 0, options);
+	reader.use_sideband = reader_use_sideband;
 
 	while (packet_reader_read(&reader) != PACKET_READ_EOF) {
 		int band;
@@ -68,6 +102,17 @@ static void unpack_sideband(void)
 		case PACKET_READ_EOF:
 			break;
 		case PACKET_READ_NORMAL:
+			/*
+			 * When the "use_sideband" field of the reader is turned
+			 * on, sideband packets other than the payload have been
+			 * parsed and consumed in packet_reader_read(), and only
+			 * the payload arrives here.
+			 */
+			if (reader.use_sideband) {
+				write_or_die(1, reader.line, reader.pktlen - 1);
+				break;
+			}
+
 			band = reader.line[0] & 0xff;
 			if (band < 1 || band > 2)
 				continue; /* skip non-sideband packets */
@@ -84,6 +129,41 @@ static void unpack_sideband(void)
 	}
 }
 
+static int send_split_sideband(void)
+{
+	const char *foo = "Foo.\n";
+	const char *bar = "Bar.\n";
+	const char *part1 = "Hello,";
+	const char *primary = "\001primary: regular output\n";
+	const char *part2 = " world!\n";
+
+	/* Each sideband message has a trailing newline character. */
+	send_sideband(1, 2, foo, strlen(foo), LARGE_PACKET_MAX);
+	send_sideband(1, 2, bar, strlen(bar), LARGE_PACKET_MAX);
+
+	/*
+	 * One sideband message is divided into part1 and part2
+	 * by the primary message.
+	 */
+	send_sideband(1, 2, part1, strlen(part1), LARGE_PACKET_MAX);
+	packet_write(1, primary, strlen(primary));
+	send_sideband(1, 2, part2, strlen(part2), LARGE_PACKET_MAX);
+	packet_response_end(1);
+
+	/*
+	 * We use unpack_sideband() to consume packets. A flush packet
+	 * is required to end parsing.
+	 */
+	packet_flush(1);
+
+	return 0;
+}
+
+static int receive_sideband(void)
+{
+	return recv_sideband("sideband", 0, 1);
+}
+
 int cmd__pkt_line(int argc, const char **argv)
 {
 	if (argc < 2)
@@ -91,10 +171,16 @@ int cmd__pkt_line(int argc, const char **argv)
 
 	if (!strcmp(argv[1], "pack"))
 		pack(argc - 2, argv + 2);
+	else if (!strcmp(argv[1], "pack-raw-stdin"))
+		pack_raw_stdin();
 	else if (!strcmp(argv[1], "unpack"))
 		unpack();
 	else if (!strcmp(argv[1], "unpack-sideband"))
-		unpack_sideband();
+		unpack_sideband(argc - 1, argv + 1);
+	else if (!strcmp(argv[1], "send-split-sideband"))
+		send_split_sideband();
+	else if (!strcmp(argv[1], "receive-sideband"))
+		receive_sideband();
 	else
 		die("invalid argument '%s'", argv[1]);
 
diff --git a/t/helper/test-prio-queue.c b/t/helper/test-prio-queue.c
deleted file mode 100644
index f402844..0000000
--- a/t/helper/test-prio-queue.c
+++ /dev/null
@@ -1,50 +0,0 @@
-#include "test-tool.h"
-#include "cache.h"
-#include "prio-queue.h"
-
-static int intcmp(const void *va, const void *vb, void *data)
-{
-	const int *a = va, *b = vb;
-	return *a - *b;
-}
-
-static void show(int *v)
-{
-	if (!v)
-		printf("NULL\n");
-	else
-		printf("%d\n", *v);
-	free(v);
-}
-
-int cmd__prio_queue(int argc, const char **argv)
-{
-	struct prio_queue pq = { intcmp };
-
-	while (*++argv) {
-		if (!strcmp(*argv, "get")) {
-			void *peek = prio_queue_peek(&pq);
-			void *get = prio_queue_get(&pq);
-			if (peek != get)
-				BUG("peek and get results do not match");
-			show(get);
-		} else if (!strcmp(*argv, "dump")) {
-			void *peek;
-			void *get;
-			while ((peek = prio_queue_peek(&pq))) {
-				get = prio_queue_get(&pq);
-				if (peek != get)
-					BUG("peek and get results do not match");
-				show(get);
-			}
-		} else if (!strcmp(*argv, "stack")) {
-			pq.compare = NULL;
-		} else {
-			int *v = xmalloc(sizeof(*v));
-			*v = atoi(*argv);
-			prio_queue_put(&pq, v);
-		}
-	}
-
-	return 0;
-}
diff --git a/t/helper/test-proc-receive.c b/t/helper/test-proc-receive.c
new file mode 100644
index 0000000..f30022d
--- /dev/null
+++ b/t/helper/test-proc-receive.c
@@ -0,0 +1,203 @@
+#include "test-tool.h"
+#include "connect.h"
+#include "hex.h"
+#include "parse-options.h"
+#include "pkt-line.h"
+#include "setup.h"
+#include "sigchain.h"
+
+static const char *proc_receive_usage[] = {
+	"test-tool proc-receive [<options>]",
+	NULL
+};
+
+static int die_read_version;
+static int die_write_version;
+static int die_read_commands;
+static int die_read_push_options;
+static int die_write_report;
+static int no_push_options;
+static int use_atomic;
+static int use_push_options;
+static int verbose;
+static int version = 1;
+static struct string_list returns = STRING_LIST_INIT_NODUP;
+
+struct command {
+	struct command *next;
+	const char *error_string;
+	unsigned int skip_update:1,
+		     did_not_exist:1;
+	int index;
+	struct object_id old_oid;
+	struct object_id new_oid;
+	char ref_name[FLEX_ARRAY]; /* more */
+};
+
+static void proc_receive_verison(struct packet_reader *reader) {
+	int server_version = 0;
+
+	if (die_read_version)
+		die("die with the --die-read-version option");
+
+	for (;;) {
+		int linelen;
+
+		if (packet_reader_read(reader) != PACKET_READ_NORMAL)
+			break;
+
+		/* Ignore version negotiation for version 0 */
+		if (version == 0)
+			continue;
+
+		if (reader->pktlen > 8 && starts_with(reader->line, "version=")) {
+			server_version = atoi(reader->line+8);
+			if (server_version != 1)
+				die("bad protocol version: %d", server_version);
+			linelen = strlen(reader->line);
+			if (linelen < reader->pktlen) {
+				const char *feature_list = reader->line + linelen + 1;
+				if (parse_feature_request(feature_list, "atomic"))
+					use_atomic= 1;
+				if (parse_feature_request(feature_list, "push-options"))
+					use_push_options = 1;
+			}
+		}
+	}
+
+	if (die_write_version)
+		die("die with the --die-write-version option");
+
+	if (version != 0)
+		packet_write_fmt(1, "version=%d%c%s\n",
+				 version, '\0',
+				 use_push_options && !no_push_options ? "push-options": "");
+	packet_flush(1);
+}
+
+static void proc_receive_read_commands(struct packet_reader *reader,
+				       struct command **commands)
+{
+	struct command **tail = commands;
+
+	for (;;) {
+		struct object_id old_oid, new_oid;
+		struct command *cmd;
+		const char *refname;
+		const char *p;
+
+		if (packet_reader_read(reader) != PACKET_READ_NORMAL)
+			break;
+
+		if (die_read_commands)
+			die("die with the --die-read-commands option");
+
+		if (parse_oid_hex(reader->line, &old_oid, &p) ||
+		    *p++ != ' ' ||
+		    parse_oid_hex(p, &new_oid, &p) ||
+		    *p++ != ' ')
+			die("protocol error: expected 'old new ref', got '%s'",
+			    reader->line);
+		refname = p;
+		FLEX_ALLOC_STR(cmd, ref_name, refname);
+		oidcpy(&cmd->old_oid, &old_oid);
+		oidcpy(&cmd->new_oid, &new_oid);
+
+		*tail = cmd;
+		tail = &cmd->next;
+	}
+}
+
+static void proc_receive_read_push_options(struct packet_reader *reader,
+					   struct string_list *options)
+{
+
+	if (no_push_options || !use_push_options)
+	       return;
+
+	if (die_read_push_options)
+		die("die with the --die-read-push-options option");
+
+	while (1) {
+		if (packet_reader_read(reader) != PACKET_READ_NORMAL)
+			break;
+
+		string_list_append(options, reader->line);
+	}
+}
+
+int cmd__proc_receive(int argc, const char **argv)
+{
+	int nongit_ok = 0;
+	struct packet_reader reader;
+	struct command *commands = NULL;
+	struct string_list push_options = STRING_LIST_INIT_DUP;
+	struct string_list_item *item;
+	struct option options[] = {
+		OPT_BOOL(0, "no-push-options", &no_push_options,
+			 "disable push options"),
+		OPT_BOOL(0, "die-read-version", &die_read_version,
+			 "die when reading version"),
+		OPT_BOOL(0, "die-write-version", &die_write_version,
+			 "die when writing version"),
+		OPT_BOOL(0, "die-read-commands", &die_read_commands,
+			 "die when reading commands"),
+		OPT_BOOL(0, "die-read-push-options", &die_read_push_options,
+			 "die when reading push-options"),
+		OPT_BOOL(0, "die-write-report", &die_write_report,
+			 "die when writing report"),
+		OPT_STRING_LIST('r', "return", &returns, "old/new/ref/status/msg",
+				"return of results"),
+		OPT__VERBOSE(&verbose, "be verbose"),
+		OPT_INTEGER('V', "version", &version,
+			    "use this protocol version number"),
+		OPT_END()
+	};
+
+	setup_git_directory_gently(&nongit_ok);
+
+	argc = parse_options(argc, argv, "test-tools", options, proc_receive_usage, 0);
+	if (argc > 0)
+		usage_msg_opt("Too many arguments.", proc_receive_usage, options);
+	packet_reader_init(&reader, 0, NULL, 0,
+			   PACKET_READ_CHOMP_NEWLINE |
+			   PACKET_READ_GENTLE_ON_EOF);
+
+	sigchain_push(SIGPIPE, SIG_IGN);
+	proc_receive_verison(&reader);
+	proc_receive_read_commands(&reader, &commands);
+	proc_receive_read_push_options(&reader, &push_options);
+
+	if (verbose) {
+		struct command *cmd;
+
+		if (use_push_options || use_atomic)
+			fprintf(stderr, "proc-receive:%s%s\n",
+				use_atomic? " atomic": "",
+				use_push_options ? " push_options": "");
+
+		for (cmd = commands; cmd; cmd = cmd->next)
+			fprintf(stderr, "proc-receive< %s %s %s\n",
+				oid_to_hex(&cmd->old_oid),
+				oid_to_hex(&cmd->new_oid),
+				cmd->ref_name);
+
+		if (push_options.nr > 0)
+			for_each_string_list_item(item, &push_options)
+				fprintf(stderr, "proc-receive< %s\n", item->string);
+
+		if (returns.nr)
+			for_each_string_list_item(item, &returns)
+				fprintf(stderr, "proc-receive> %s\n", item->string);
+	}
+
+	if (die_write_report)
+		die("die with the --die-write-report option");
+	if (returns.nr)
+		for_each_string_list_item(item, &returns)
+			packet_write_fmt(1, "%s\n", item->string);
+	packet_flush(1);
+	sigchain_pop(SIGPIPE);
+
+	return 0;
+}
diff --git a/t/helper/test-progress.c b/t/helper/test-progress.c
index 5d05cbe..66acb6a 100644
--- a/t/helper/test-progress.c
+++ b/t/helper/test-progress.c
@@ -3,6 +3,9 @@
  *
  * Reads instructions from standard input, one instruction per line:
  *
+ *   "start <total>[ <title>]" - Call start_progress(title, total),
+ *                               Uses the default title of "Working hard"
+ *                               if the " <title>" is omitted.
  *   "progress <items>" - Call display_progress() with the given item count
  *                        as parameter.
  *   "throughput <bytes> <millis> - Call display_throughput() with the given
@@ -10,43 +13,59 @@
  *                                  specify the time elapsed since the
  *                                  start_progress() call.
  *   "update" - Set the 'progress_update' flag.
+ *   "stop" - Call stop_progress().
  *
  * See 't0500-progress-display.sh' for examples.
  */
 #define GIT_TEST_PROGRESS_ONLY
 #include "test-tool.h"
-#include "gettext.h"
 #include "parse-options.h"
 #include "progress.h"
 #include "strbuf.h"
+#include "string-list.h"
 
 int cmd__progress(int argc, const char **argv)
 {
-	int total = 0;
-	const char *title;
+	const char *const default_title = "Working hard";
+	struct string_list titles = STRING_LIST_INIT_DUP;
 	struct strbuf line = STRBUF_INIT;
-	struct progress *progress;
+	struct progress *progress = NULL;
 
 	const char *usage[] = {
-		"test-tool progress [--total=<n>] <progress-title>",
+		"test-tool progress <stdin",
 		NULL
 	};
 	struct option options[] = {
-		OPT_INTEGER(0, "total", &total, "total number of items"),
 		OPT_END(),
 	};
 
 	argc = parse_options(argc, argv, NULL, options, usage, 0);
-	if (argc != 1)
-		die("need a title for the progress output");
-	title = argv[0];
+	if (argc)
+		usage_with_options(usage, options);
 
 	progress_testing = 1;
-	progress = start_progress(title, total);
 	while (strbuf_getline(&line, stdin) != EOF) {
 		char *end;
 
-		if (skip_prefix(line.buf, "progress ", (const char **) &end)) {
+		if (skip_prefix(line.buf, "start ", (const char **) &end)) {
+			uint64_t total = strtoull(end, &end, 10);
+			const char *title;
+
+			/*
+			 * We can't use "end + 1" as an argument to
+			 * start_progress(), it doesn't xstrdup() its
+			 * "title" argument. We need to hold onto a
+			 * valid "char *" for it until the end.
+			 */
+			if (!*end)
+				title = default_title;
+			else if (*end == ' ')
+				title = string_list_insert(&titles, end + 1)->string;
+			else
+				die("invalid input: '%s'\n", line.buf);
+
+			progress = start_progress(title, total);
+		} else if (skip_prefix(line.buf, "progress ", (const char **) &end)) {
 			uint64_t item_count = strtoull(end, &end, 10);
 			if (*end != '\0')
 				die("invalid input: '%s'\n", line.buf);
@@ -63,12 +82,16 @@ int cmd__progress(int argc, const char **argv)
 				die("invalid input: '%s'\n", line.buf);
 			progress_test_ns = test_ms * 1000 * 1000;
 			display_throughput(progress, byte_count);
-		} else if (!strcmp(line.buf, "update"))
+		} else if (!strcmp(line.buf, "update")) {
 			progress_test_force_update();
-		else
+		} else if (!strcmp(line.buf, "stop")) {
+			stop_progress(&progress);
+		} else {
 			die("invalid input: '%s'\n", line.buf);
+		}
 	}
-	stop_progress(&progress);
+	strbuf_release(&line);
+	string_list_clear(&titles, 0);
 
 	return 0;
 }
diff --git a/t/helper/test-reach.c b/t/helper/test-reach.c
index 14a3655..1e3b431 100644
--- a/t/helper/test-reach.c
+++ b/t/helper/test-reach.c
@@ -1,10 +1,11 @@
 #include "test-tool.h"
-#include "cache.h"
 #include "commit.h"
 #include "commit-reach.h"
-#include "config.h"
-#include "parse-options.h"
+#include "gettext.h"
+#include "hex.h"
+#include "object-name.h"
 #include "ref-filter.h"
+#include "setup.h"
 #include "string-list.h"
 #include "tag.h"
 
@@ -57,7 +58,7 @@ int cmd__reach(int ac, const char **av)
 		if (buf.len < 3)
 			continue;
 
-		if (get_oid_committish(buf.buf + 2, &oid))
+		if (repo_get_oid_committish(the_repository, buf.buf + 2, &oid))
 			die("failed to resolve %s", buf.buf + 2);
 
 		orig = parse_object(r, &oid);
@@ -106,11 +107,20 @@ int cmd__reach(int ac, const char **av)
 	if (!strcmp(av[1], "ref_newer"))
 		printf("%s(A,B):%d\n", av[1], ref_newer(&oid_A, &oid_B));
 	else if (!strcmp(av[1], "in_merge_bases"))
-		printf("%s(A,B):%d\n", av[1], in_merge_bases(A, B));
+		printf("%s(A,B):%d\n", av[1],
+		       repo_in_merge_bases(the_repository, A, B));
+	else if (!strcmp(av[1], "in_merge_bases_many"))
+		printf("%s(A,X):%d\n", av[1],
+		       repo_in_merge_bases_many(the_repository, A, X_nr, X_array, 0));
 	else if (!strcmp(av[1], "is_descendant_of"))
 		printf("%s(A,X):%d\n", av[1], repo_is_descendant_of(r, A, X));
 	else if (!strcmp(av[1], "get_merge_bases_many")) {
-		struct commit_list *list = get_merge_bases_many(A, X_nr, X_array);
+		struct commit_list *list = NULL;
+		if (repo_get_merge_bases_many(the_repository,
+					      A, X_nr,
+					      X_array,
+					      &list) < 0)
+			exit(128);
 		printf("%s(A,X):\n", av[1]);
 		print_sorted_commit_ids(list);
 	} else if (!strcmp(av[1], "reduce_heads")) {
@@ -129,7 +139,7 @@ int cmd__reach(int ac, const char **av)
 
 		printf("%s(X,_,_,0,0):%d\n", av[1], can_all_from_reach_with_flag(&X_obj, 2, 4, 0, 0));
 	} else if (!strcmp(av[1], "commit_contains")) {
-		struct ref_filter filter;
+		struct ref_filter filter = REF_FILTER_INIT;
 		struct contains_cache cache;
 		init_contains_cache(&cache);
 
@@ -164,5 +174,5 @@ int cmd__reach(int ac, const char **av)
 		print_sorted_commit_ids(list);
 	}
 
-	exit(0);
+	return 0;
 }
diff --git a/t/helper/test-read-cache.c b/t/helper/test-read-cache.c
index 244977a..1acd362 100644
--- a/t/helper/test-read-cache.c
+++ b/t/helper/test-read-cache.c
@@ -1,12 +1,17 @@
+#define USE_THE_INDEX_VARIABLE
 #include "test-tool.h"
-#include "cache.h"
 #include "config.h"
+#include "read-cache-ll.h"
+#include "repository.h"
+#include "setup.h"
 
 int cmd__read_cache(int argc, const char **argv)
 {
 	int i, cnt = 1;
 	const char *name = NULL;
 
+	initialize_the_repository();
+
 	if (argc > 1 && skip_prefix(argv[1], "--print-and-refresh=", &name)) {
 		argc--;
 		argv++;
@@ -16,8 +21,9 @@ int cmd__read_cache(int argc, const char **argv)
 		cnt = strtol(argv[1], NULL, 0);
 	setup_git_directory();
 	git_config(git_default_config, NULL);
+
 	for (i = 0; i < cnt; i++) {
-		read_cache();
+		repo_read_index(the_repository);
 		if (name) {
 			int pos;
 
@@ -30,7 +36,7 @@ int cmd__read_cache(int argc, const char **argv)
 			       ce_uptodate(the_index.cache[pos]) ? "" : " not");
 			write_file(name, "%d\n", i);
 		}
-		discard_cache();
+		discard_index(&the_index);
 	}
 	return 0;
 }
diff --git a/t/helper/test-read-graph.c b/t/helper/test-read-graph.c
index 6d0c962..8c7a83f 100644
--- a/t/helper/test-read-graph.c
+++ b/t/helper/test-read-graph.c
@@ -1,10 +1,11 @@
 #include "test-tool.h"
-#include "cache.h"
 #include "commit-graph.h"
 #include "repository.h"
-#include "object-store.h"
+#include "object-store-ll.h"
+#include "bloom.h"
+#include "setup.h"
 
-int cmd__read_graph(int argc, const char **argv)
+int cmd__read_graph(int argc UNUSED, const char **argv UNUSED)
 {
 	struct commit_graph *graph = NULL;
 	struct object_directory *odb;
@@ -12,11 +13,12 @@ int cmd__read_graph(int argc, const char **argv)
 	setup_git_directory();
 	odb = the_repository->objects->odb;
 
+	prepare_repo_settings(the_repository);
+
 	graph = read_commit_graph_one(the_repository, odb);
 	if (!graph)
 		return 1;
 
-
 	printf("header: %08x %d %d %d %d\n",
 		ntohl(*(uint32_t*)graph->data),
 		*(unsigned char*)(graph->data + 4),
@@ -32,6 +34,10 @@ int cmd__read_graph(int argc, const char **argv)
 		printf(" oid_lookup");
 	if (graph->chunk_commit_data)
 		printf(" commit_metadata");
+	if (graph->chunk_generation_data)
+		printf(" generation_data");
+	if (graph->chunk_generation_data_overflow)
+		printf(" generation_data_overflow");
 	if (graph->chunk_extra_edges)
 		printf(" extra_edges");
 	if (graph->chunk_bloom_indexes)
@@ -40,6 +46,18 @@ int cmd__read_graph(int argc, const char **argv)
 		printf(" bloom_data");
 	printf("\n");
 
+	printf("options:");
+	if (graph->bloom_filter_settings)
+		printf(" bloom(%"PRIu32",%"PRIu32",%"PRIu32")",
+		       graph->bloom_filter_settings->hash_version,
+		       graph->bloom_filter_settings->bits_per_entry,
+		       graph->bloom_filter_settings->num_hashes);
+	if (graph->read_generation_data)
+		printf(" read_generation_data");
+	if (graph->topo_levels)
+		printf(" topo_levels");
+	printf("\n");
+
 	UNLEAK(graph);
 
 	return 0;
diff --git a/t/helper/test-read-midx.c b/t/helper/test-read-midx.c
index 831b586..4acae41 100644
--- a/t/helper/test-read-midx.c
+++ b/t/helper/test-read-midx.c
@@ -1,20 +1,28 @@
 #include "test-tool.h"
-#include "cache.h"
+#include "hex.h"
 #include "midx.h"
 #include "repository.h"
-#include "object-store.h"
+#include "object-store-ll.h"
+#include "pack-bitmap.h"
+#include "packfile.h"
+#include "setup.h"
+#include "gettext.h"
 
-static int read_midx_file(const char *object_dir)
+static int read_midx_file(const char *object_dir, int show_objects)
 {
 	uint32_t i;
-	struct multi_pack_index *m = load_multi_pack_index(object_dir, 1);
+	struct multi_pack_index *m;
+
+	setup_git_directory();
+	m = load_multi_pack_index(object_dir, 1);
 
 	if (!m)
 		return 1;
 
-	printf("header: %08x %d %d %d\n",
+	printf("header: %08x %d %d %d %d\n",
 	       m->signature,
 	       m->version,
+	       m->hash_len,
 	       m->num_chunks,
 	       m->num_packs);
 
@@ -39,13 +47,94 @@ static int read_midx_file(const char *object_dir)
 
 	printf("object-dir: %s\n", m->object_dir);
 
+	if (show_objects) {
+		struct object_id oid;
+		struct pack_entry e;
+
+		for (i = 0; i < m->num_objects; i++) {
+			nth_midxed_object_oid(&oid, m, i);
+			fill_midx_entry(the_repository, &oid, &e, m);
+
+			printf("%s %"PRIu64"\t%s\n",
+			       oid_to_hex(&oid), e.offset, e.p->pack_name);
+		}
+	}
+
+	close_midx(m);
+
+	return 0;
+}
+
+static int read_midx_checksum(const char *object_dir)
+{
+	struct multi_pack_index *m;
+
+	setup_git_directory();
+	m = load_multi_pack_index(object_dir, 1);
+	if (!m)
+		return 1;
+	printf("%s\n", hash_to_hex(get_midx_checksum(m)));
+	return 0;
+}
+
+static int read_midx_preferred_pack(const char *object_dir)
+{
+	struct multi_pack_index *midx = NULL;
+	uint32_t preferred_pack;
+
+	setup_git_directory();
+
+	midx = load_multi_pack_index(object_dir, 1);
+	if (!midx)
+		return 1;
+
+	if (midx_preferred_pack(midx, &preferred_pack) < 0) {
+		warning(_("could not determine MIDX preferred pack"));
+		return 1;
+	}
+
+	printf("%s\n", midx->pack_names[preferred_pack]);
+	return 0;
+}
+
+static int read_midx_bitmapped_packs(const char *object_dir)
+{
+	struct multi_pack_index *midx = NULL;
+	struct bitmapped_pack pack;
+	uint32_t i;
+
+	setup_git_directory();
+
+	midx = load_multi_pack_index(object_dir, 1);
+	if (!midx)
+		return 1;
+
+	for (i = 0; i < midx->num_packs; i++) {
+		if (nth_bitmapped_pack(the_repository, midx, &pack, i) < 0)
+			return 1;
+
+		printf("%s\n", pack_basename(pack.p));
+		printf("  bitmap_pos: %"PRIuMAX"\n", (uintmax_t)pack.bitmap_pos);
+		printf("  bitmap_nr: %"PRIuMAX"\n", (uintmax_t)pack.bitmap_nr);
+	}
+
+	close_midx(midx);
+
 	return 0;
 }
 
 int cmd__read_midx(int argc, const char **argv)
 {
-	if (argc != 2)
-		usage("read-midx <object-dir>");
+	if (!(argc == 2 || argc == 3))
+		usage("read-midx [--show-objects|--checksum|--preferred-pack|--bitmap] <object-dir>");
 
-	return read_midx_file(argv[1]);
+	if (!strcmp(argv[1], "--show-objects"))
+		return read_midx_file(argv[2], 1);
+	else if (!strcmp(argv[1], "--checksum"))
+		return read_midx_checksum(argv[2]);
+	else if (!strcmp(argv[1], "--preferred-pack"))
+		return read_midx_preferred_pack(argv[2]);
+	else if (!strcmp(argv[1], "--bitmap"))
+		return read_midx_bitmapped_packs(argv[2]);
+	return read_midx_file(argv[1], 0);
 }
diff --git a/t/helper/test-ref-store.c b/t/helper/test-ref-store.c
index 759e69d..82bbf6e 100644
--- a/t/helper/test-ref-store.c
+++ b/t/helper/test-ref-store.c
@@ -1,9 +1,55 @@
 #include "test-tool.h"
-#include "cache.h"
+#include "hex.h"
 #include "refs.h"
+#include "setup.h"
 #include "worktree.h"
-#include "object-store.h"
+#include "object-store-ll.h"
+#include "path.h"
 #include "repository.h"
+#include "strbuf.h"
+#include "revision.h"
+
+struct flag_definition {
+	const char *name;
+	uint64_t mask;
+};
+
+#define FLAG_DEF(x)     \
+	{               \
+#x, (x) \
+	}
+
+static unsigned int parse_flags(const char *str, struct flag_definition *defs)
+{
+	struct string_list masks = STRING_LIST_INIT_DUP;
+	int i = 0;
+	unsigned int result = 0;
+
+	if (!strcmp(str, "0"))
+		return 0;
+
+	string_list_split(&masks, str, ',', 64);
+	for (; i < masks.nr; i++) {
+		const char *name = masks.items[i].string;
+		struct flag_definition *def = defs;
+		int found = 0;
+		while (def->name) {
+			if (!strcmp(def->name, name)) {
+				result |= def->mask;
+				found = 1;
+				break;
+			}
+			def++;
+		}
+		if (!found)
+			die("unknown flag \"%s\"", name);
+	}
+
+	string_list_clear(&masks, 0);
+	return result;
+}
+
+static struct flag_definition empty_flags[] = { { NULL, 0 } };
 
 static const char *notnull(const char *arg, const char *name)
 {
@@ -12,9 +58,10 @@ static const char *notnull(const char *arg, const char *name)
 	return arg;
 }
 
-static unsigned int arg_flags(const char *arg, const char *name)
+static unsigned int arg_flags(const char *arg, const char *name,
+			      struct flag_definition *defs)
 {
-	return atoi(notnull(arg, name));
+	return parse_flags(notnull(arg, name), defs);
 }
 
 static const char **get_store(const char **argv, struct ref_store **refs)
@@ -53,6 +100,7 @@ static const char **get_store(const char **argv, struct ref_store **refs)
 			die("no such worktree: %s", gitdir);
 
 		*refs = get_worktree_ref_store(*p);
+		free_worktrees(worktrees);
 	} else
 		die("unknown backend %s", argv[0]);
 
@@ -64,26 +112,6 @@ static const char **get_store(const char **argv, struct ref_store **refs)
 	return argv + 1;
 }
 
-
-static int cmd_pack_refs(struct ref_store *refs, const char **argv)
-{
-	unsigned int flags = arg_flags(*argv++, "flags");
-
-	return refs_pack_refs(refs, flags);
-}
-
-static int cmd_peel_ref(struct ref_store *refs, const char **argv)
-{
-	const char *refname = notnull(*argv++, "refname");
-	struct object_id oid;
-	int ret;
-
-	ret = refs_peel_ref(refs, refname, &oid);
-	if (!ret)
-		puts(oid_to_hex(&oid));
-	return ret;
-}
-
 static int cmd_create_symref(struct ref_store *refs, const char **argv)
 {
 	const char *refname = notnull(*argv++, "refname");
@@ -93,16 +121,27 @@ static int cmd_create_symref(struct ref_store *refs, const char **argv)
 	return refs_create_symref(refs, refname, target, logmsg);
 }
 
+static struct flag_definition transaction_flags[] = {
+	FLAG_DEF(REF_NO_DEREF),
+	FLAG_DEF(REF_FORCE_CREATE_REFLOG),
+	FLAG_DEF(REF_SKIP_OID_VERIFICATION),
+	FLAG_DEF(REF_SKIP_REFNAME_VERIFICATION),
+	{ NULL, 0 }
+};
+
 static int cmd_delete_refs(struct ref_store *refs, const char **argv)
 {
-	unsigned int flags = arg_flags(*argv++, "flags");
+	unsigned int flags = arg_flags(*argv++, "flags", transaction_flags);
 	const char *msg = *argv++;
 	struct string_list refnames = STRING_LIST_INIT_NODUP;
+	int result;
 
 	while (*argv)
 		string_list_append(&refnames, *argv++);
 
-	return refs_delete_refs(refs, msg, &refnames, flags);
+	result = refs_delete_refs(refs, msg, &refnames, flags);
+	string_list_clear(&refnames, 0);
+	return result;
 }
 
 static int cmd_rename_ref(struct ref_store *refs, const char **argv)
@@ -115,7 +154,7 @@ static int cmd_rename_ref(struct ref_store *refs, const char **argv)
 }
 
 static int each_ref(const char *refname, const struct object_id *oid,
-		    int flags, void *cb_data)
+		    int flags, void *cb_data UNUSED)
 {
 	printf("%s %s 0x%x\n", oid_to_hex(oid), refname, flags);
 	return 0;
@@ -128,11 +167,20 @@ static int cmd_for_each_ref(struct ref_store *refs, const char **argv)
 	return refs_for_each_ref_in(refs, prefix, each_ref, NULL);
 }
 
+static int cmd_for_each_ref__exclude(struct ref_store *refs, const char **argv)
+{
+	const char *prefix = notnull(*argv++, "prefix");
+	const char **exclude_patterns = argv;
+
+	return refs_for_each_fullref_in(refs, prefix, exclude_patterns, each_ref,
+					NULL);
+}
+
 static int cmd_resolve_ref(struct ref_store *refs, const char **argv)
 {
-	struct object_id oid;
+	struct object_id oid = *null_oid();
 	const char *refname = notnull(*argv++, "refname");
-	int resolve_flags = arg_flags(*argv++, "resolve-flags");
+	int resolve_flags = arg_flags(*argv++, "resolve-flags", empty_flags);
 	int flags;
 	const char *ref;
 
@@ -154,18 +202,25 @@ static int cmd_verify_ref(struct ref_store *refs, const char **argv)
 	return ret;
 }
 
-static int cmd_for_each_reflog(struct ref_store *refs, const char **argv)
+static int each_reflog(const char *refname, void *cb_data UNUSED)
+{
+	printf("%s\n", refname);
+	return 0;
+}
+
+static int cmd_for_each_reflog(struct ref_store *refs,
+			       const char **argv UNUSED)
 {
-	return refs_for_each_reflog(refs, each_ref, NULL);
+	return refs_for_each_reflog(refs, each_reflog, NULL);
 }
 
-static int each_reflog(struct object_id *old_oid, struct object_id *new_oid,
-		       const char *committer, timestamp_t timestamp,
-		       int tz, const char *msg, void *cb_data)
+static int each_reflog_ent(struct object_id *old_oid, struct object_id *new_oid,
+			   const char *committer, timestamp_t timestamp,
+			   int tz, const char *msg, void *cb_data UNUSED)
 {
-	printf("%s %s %s %"PRItime" %d %s\n",
-	       oid_to_hex(old_oid), oid_to_hex(new_oid),
-	       committer, timestamp, tz, msg);
+	printf("%s %s %s %" PRItime " %+05d%s%s", oid_to_hex(old_oid),
+	       oid_to_hex(new_oid), committer, timestamp, tz,
+	       *msg == '\n' ? "" : "\t", msg);
 	return 0;
 }
 
@@ -173,14 +228,14 @@ static int cmd_for_each_reflog_ent(struct ref_store *refs, const char **argv)
 {
 	const char *refname = notnull(*argv++, "refname");
 
-	return refs_for_each_reflog_ent(refs, refname, each_reflog, refs);
+	return refs_for_each_reflog_ent(refs, refname, each_reflog_ent, refs);
 }
 
 static int cmd_for_each_reflog_ent_reverse(struct ref_store *refs, const char **argv)
 {
 	const char *refname = notnull(*argv++, "refname");
 
-	return refs_for_each_reflog_ent_reverse(refs, refname, each_reflog, refs);
+	return refs_for_each_reflog_ent_reverse(refs, refname, each_reflog_ent, refs);
 }
 
 static int cmd_reflog_exists(struct ref_store *refs, const char **argv)
@@ -193,11 +248,10 @@ static int cmd_reflog_exists(struct ref_store *refs, const char **argv)
 static int cmd_create_reflog(struct ref_store *refs, const char **argv)
 {
 	const char *refname = notnull(*argv++, "refname");
-	int force_create = arg_flags(*argv++, "force-create");
 	struct strbuf err = STRBUF_INIT;
 	int ret;
 
-	ret = refs_create_reflog(refs, refname, force_create, &err);
+	ret = refs_create_reflog(refs, refname, &err);
 	if (err.len)
 		puts(err.buf);
 	return ret;
@@ -210,21 +264,16 @@ static int cmd_delete_reflog(struct ref_store *refs, const char **argv)
 	return refs_delete_reflog(refs, refname);
 }
 
-static int cmd_reflog_expire(struct ref_store *refs, const char **argv)
-{
-	die("not supported yet");
-}
-
 static int cmd_delete_ref(struct ref_store *refs, const char **argv)
 {
 	const char *msg = notnull(*argv++, "msg");
 	const char *refname = notnull(*argv++, "refname");
 	const char *sha1_buf = notnull(*argv++, "old-sha1");
-	unsigned int flags = arg_flags(*argv++, "flags");
+	unsigned int flags = arg_flags(*argv++, "flags", transaction_flags);
 	struct object_id old_oid;
 
 	if (get_oid_hex(sha1_buf, &old_oid))
-		die("not sha-1");
+		die("cannot parse %s as %s", sha1_buf, the_hash_algo->name);
 
 	return refs_delete_ref(refs, msg, refname, &old_oid, flags);
 }
@@ -235,16 +284,20 @@ static int cmd_update_ref(struct ref_store *refs, const char **argv)
 	const char *refname = notnull(*argv++, "refname");
 	const char *new_sha1_buf = notnull(*argv++, "new-sha1");
 	const char *old_sha1_buf = notnull(*argv++, "old-sha1");
-	unsigned int flags = arg_flags(*argv++, "flags");
-	struct object_id old_oid;
+	unsigned int flags = arg_flags(*argv++, "flags", transaction_flags);
+	struct object_id old_oid, *old_oid_ptr = NULL;
 	struct object_id new_oid;
 
-	if (get_oid_hex(old_sha1_buf, &old_oid) ||
-	    get_oid_hex(new_sha1_buf, &new_oid))
-		die("not sha-1");
+	if (*old_sha1_buf) {
+		if (get_oid_hex(old_sha1_buf, &old_oid))
+			die("cannot parse %s as %s", old_sha1_buf, the_hash_algo->name);
+		old_oid_ptr = &old_oid;
+	}
+	if (get_oid_hex(new_sha1_buf, &new_oid))
+		die("cannot parse %s as %s", new_sha1_buf, the_hash_algo->name);
 
 	return refs_update_ref(refs, msg, refname,
-			       &new_oid, &old_oid,
+			       &new_oid, old_oid_ptr,
 			       flags, UPDATE_REFS_DIE_ON_ERR);
 }
 
@@ -254,12 +307,11 @@ struct command {
 };
 
 static struct command commands[] = {
-	{ "pack-refs", cmd_pack_refs },
-	{ "peel-ref", cmd_peel_ref },
 	{ "create-symref", cmd_create_symref },
 	{ "delete-refs", cmd_delete_refs },
 	{ "rename-ref", cmd_rename_ref },
 	{ "for-each-ref", cmd_for_each_ref },
+	{ "for-each-ref--exclude", cmd_for_each_ref__exclude },
 	{ "resolve-ref", cmd_resolve_ref },
 	{ "verify-ref", cmd_verify_ref },
 	{ "for-each-reflog", cmd_for_each_reflog },
@@ -268,7 +320,6 @@ static struct command commands[] = {
 	{ "reflog-exists", cmd_reflog_exists },
 	{ "create-reflog", cmd_create_reflog },
 	{ "delete-reflog", cmd_delete_reflog },
-	{ "reflog-expire", cmd_reflog_expire },
 	/*
 	 * backend transaction functions can't be tested separately
 	 */
@@ -277,7 +328,7 @@ static struct command commands[] = {
 	{ NULL, NULL }
 };
 
-int cmd__ref_store(int argc, const char **argv)
+int cmd__ref_store(int argc UNUSED, const char **argv)
 {
 	struct ref_store *refs;
 	const char *func;
diff --git a/t/helper/test-reftable.c b/t/helper/test-reftable.c
new file mode 100644
index 0000000..00237ef
--- /dev/null
+++ b/t/helper/test-reftable.c
@@ -0,0 +1,23 @@
+#include "reftable/system.h"
+#include "reftable/reftable-tests.h"
+#include "test-tool.h"
+
+int cmd__reftable(int argc, const char **argv)
+{
+	/* test from simple to complex. */
+	basics_test_main(argc, argv);
+	record_test_main(argc, argv);
+	block_test_main(argc, argv);
+	tree_test_main(argc, argv);
+	pq_test_main(argc, argv);
+	readwrite_test_main(argc, argv);
+	merged_test_main(argc, argv);
+	stack_test_main(argc, argv);
+	refname_test_main(argc, argv);
+	return 0;
+}
+
+int cmd__dump_reftable(int argc, const char **argv)
+{
+	return reftable_dump_main(argc, (char *const *)argv);
+}
diff --git a/t/helper/test-regex.c b/t/helper/test-regex.c
index d6f28ca..80042ea 100644
--- a/t/helper/test-regex.c
+++ b/t/helper/test-regex.c
@@ -30,10 +30,11 @@ static int test_regex_bug(void)
 	if (regexec(&r, str, 1, m, 0))
 		die("no match of pattern '%s' to string '%s'", pat, str);
 
-	/* http://sourceware.org/bugzilla/show_bug.cgi?id=3957  */
+	/* https://sourceware.org/bugzilla/show_bug.cgi?id=3957 */
 	if (m[0].rm_so == 3) /* matches '\n' when it should not */
 		die("regex bug confirmed: re-build git with NO_REGEX=1");
 
+	regfree(&r);
 	return 0;
 }
 
@@ -94,18 +95,20 @@ int cmd__regex(int argc, const char **argv)
 		die("failed regcomp() for pattern '%s' (%s)", pat, errbuf);
 	}
 	if (!str)
-		return 0;
+		goto cleanup;
 
 	ret = regexec(&r, str, 1, m, 0);
 	if (ret) {
 		if (silent || ret == REG_NOMATCH)
-			return ret;
+			goto cleanup;
 
 		regerror(ret, &r, errbuf, sizeof(errbuf));
 		die("failed regexec() for subject '%s' (%s)", str, errbuf);
 	}
 
-	return 0;
+cleanup:
+	regfree(&r);
+	return ret;
 usage:
 	usage("\ttest-tool regex --bug\n"
 	      "\ttest-tool regex [--silent] <pattern>\n"
diff --git a/t/helper/test-repository.c b/t/helper/test-repository.c
index 56f0e3c..0c7c5aa 100644
--- a/t/helper/test-repository.c
+++ b/t/helper/test-repository.c
@@ -1,11 +1,11 @@
 #include "test-tool.h"
-#include "cache.h"
 #include "commit-graph.h"
 #include "commit.h"
-#include "config.h"
-#include "object-store.h"
+#include "environment.h"
+#include "hex.h"
 #include "object.h"
 #include "repository.h"
+#include "setup.h"
 #include "tree.h"
 
 static void test_parse_commit_in_graph(const char *gitdir, const char *worktree,
diff --git a/t/helper/test-revision-walking.c b/t/helper/test-revision-walking.c
index 625b2db..f346951 100644
--- a/t/helper/test-revision-walking.c
+++ b/t/helper/test-revision-walking.c
@@ -9,17 +9,19 @@
  */
 
 #include "test-tool.h"
-#include "cache.h"
 #include "commit.h"
 #include "diff.h"
+#include "repository.h"
 #include "revision.h"
+#include "setup.h"
 
 static void print_commit(struct commit *commit)
 {
 	struct strbuf sb = STRBUF_INIT;
 	struct pretty_print_context ctx = {0};
 	ctx.date_mode.type = DATE_NORMAL;
-	format_commit_message(commit, " %m %s", &sb, &ctx);
+	repo_format_commit_message(the_repository, commit, " %m %s", &sb,
+				   &ctx);
 	printf("%s\n", sb.buf);
 	strbuf_release(&sb);
 }
@@ -43,6 +45,7 @@ static int run_revision_walk(void)
 	}
 
 	reset_revision_walk();
+	release_revisions(&rev);
 	return got_revision;
 }
 
diff --git a/t/helper/test-rot13-filter.c b/t/helper/test-rot13-filter.c
new file mode 100644
index 0000000..f8d564c
--- /dev/null
+++ b/t/helper/test-rot13-filter.c
@@ -0,0 +1,382 @@
+/*
+ * Example implementation for the Git filter protocol version 2
+ * See Documentation/gitattributes.txt, section "Filter Protocol"
+ *
+ * Usage: test-tool rot13-filter [--always-delay] --log=<path> <capabilities>
+ *
+ * Log path defines a debug log file that the script writes to. The
+ * subsequent arguments define a list of supported protocol capabilities
+ * ("clean", "smudge", etc).
+ *
+ * When --always-delay is given all pathnames with the "can-delay" flag
+ * that don't appear on the list bellow are delayed with a count of 1
+ * (see more below).
+ *
+ * This implementation supports special test cases:
+ * (1) If data with the pathname "clean-write-fail.r" is processed with
+ *     a "clean" operation then the write operation will die.
+ * (2) If data with the pathname "smudge-write-fail.r" is processed with
+ *     a "smudge" operation then the write operation will die.
+ * (3) If data with the pathname "error.r" is processed with any
+ *     operation then the filter signals that it cannot or does not want
+ *     to process the file.
+ * (4) If data with the pathname "abort.r" is processed with any
+ *     operation then the filter signals that it cannot or does not want
+ *     to process the file and any file after that is processed with the
+ *     same command.
+ * (5) If data with a pathname that is a key in the delay hash is
+ *     requested (e.g. "test-delay10.a") then the filter responds with
+ *     a "delay" status and sets the "requested" field in the delay hash.
+ *     The filter will signal the availability of this object after
+ *     "count" (field in delay hash) "list_available_blobs" commands.
+ * (6) If data with the pathname "missing-delay.a" is processed that the
+ *     filter will drop the path from the "list_available_blobs" response.
+ * (7) If data with the pathname "invalid-delay.a" is processed that the
+ *     filter will add the path "unfiltered" which was not delayed before
+ *     to the "list_available_blobs" response.
+ */
+
+#include "test-tool.h"
+#include "pkt-line.h"
+#include "string-list.h"
+#include "strmap.h"
+#include "parse-options.h"
+
+static FILE *logfile;
+static int always_delay, has_clean_cap, has_smudge_cap;
+static struct strmap delay = STRMAP_INIT;
+
+static inline const char *str_or_null(const char *str)
+{
+	return str ? str : "(null)";
+}
+
+static char *rot13(char *str)
+{
+	char *c;
+	for (c = str; *c; c++)
+		if (isalpha(*c))
+			*c += tolower(*c) < 'n' ? 13 : -13;
+	return str;
+}
+
+static char *get_value(char *buf, const char *key)
+{
+	const char *orig_buf = buf;
+	if (!buf ||
+	    !skip_prefix((const char *)buf, key, (const char **)&buf) ||
+	    !skip_prefix((const char *)buf, "=", (const char **)&buf) ||
+	    !*buf)
+		die("expected key '%s', got '%s'", key, str_or_null(orig_buf));
+	return buf;
+}
+
+/*
+ * Read a text packet, expecting that it is in the form "key=value" for
+ * the given key. An EOF does not trigger any error and is reported
+ * back to the caller with NULL. Die if the "key" part of "key=value" does
+ * not match the given key, or the value part is empty.
+ */
+static char *packet_key_val_read(const char *key)
+{
+	char *buf;
+	if (packet_read_line_gently(0, NULL, &buf) < 0)
+		return NULL;
+	return xstrdup(get_value(buf, key));
+}
+
+static inline void assert_remote_capability(struct strset *caps, const char *cap)
+{
+	if (!strset_contains(caps, cap))
+		die("required '%s' capability not available from remote", cap);
+}
+
+static void read_capabilities(struct strset *remote_caps)
+{
+	for (;;) {
+		char *buf = packet_read_line(0, NULL);
+		if (!buf)
+			break;
+		strset_add(remote_caps, get_value(buf, "capability"));
+	}
+
+	assert_remote_capability(remote_caps, "clean");
+	assert_remote_capability(remote_caps, "smudge");
+	assert_remote_capability(remote_caps, "delay");
+}
+
+static void check_and_write_capabilities(struct strset *remote_caps,
+					 const char **caps, int nr_caps)
+{
+	int i;
+	for (i = 0; i < nr_caps; i++) {
+		if (!strset_contains(remote_caps, caps[i]))
+			die("our capability '%s' is not available from remote",
+			    caps[i]);
+		packet_write_fmt(1, "capability=%s\n", caps[i]);
+	}
+	packet_flush(1);
+}
+
+struct delay_entry {
+	int requested, count;
+	char *output;
+};
+
+static void free_delay_entries(void)
+{
+	struct hashmap_iter iter;
+	struct strmap_entry *ent;
+
+	strmap_for_each_entry(&delay, &iter, ent) {
+		struct delay_entry *delay_entry = ent->value;
+		free(delay_entry->output);
+		free(delay_entry);
+	}
+	strmap_clear(&delay, 0);
+}
+
+static void add_delay_entry(char *pathname, int count, int requested)
+{
+	struct delay_entry *entry = xcalloc(1, sizeof(*entry));
+	entry->count = count;
+	entry->requested = requested;
+	if (strmap_put(&delay, pathname, entry))
+		BUG("adding the same path twice to delay hash?");
+}
+
+static void reply_list_available_blobs_cmd(void)
+{
+	struct hashmap_iter iter;
+	struct strmap_entry *ent;
+	struct string_list_item *str_item;
+	struct string_list paths = STRING_LIST_INIT_NODUP;
+
+	/* flush */
+	if (packet_read_line(0, NULL))
+		die("bad list_available_blobs end");
+
+	strmap_for_each_entry(&delay, &iter, ent) {
+		struct delay_entry *delay_entry = ent->value;
+		if (!delay_entry->requested)
+			continue;
+		delay_entry->count--;
+		if (!strcmp(ent->key, "invalid-delay.a")) {
+			/* Send Git a pathname that was not delayed earlier */
+			packet_write_fmt(1, "pathname=unfiltered");
+		}
+		if (!strcmp(ent->key, "missing-delay.a")) {
+			/* Do not signal Git that this file is available */
+		} else if (!delay_entry->count) {
+			string_list_append(&paths, ent->key);
+			packet_write_fmt(1, "pathname=%s", ent->key);
+		}
+	}
+
+	/* Print paths in sorted order. */
+	string_list_sort(&paths);
+	for_each_string_list_item(str_item, &paths)
+		fprintf(logfile, " %s", str_item->string);
+	string_list_clear(&paths, 0);
+
+	packet_flush(1);
+
+	fprintf(logfile, " [OK]\n");
+	packet_write_fmt(1, "status=success");
+	packet_flush(1);
+}
+
+static void command_loop(void)
+{
+	for (;;) {
+		char *buf, *output;
+		char *pathname;
+		struct delay_entry *entry;
+		struct strbuf input = STRBUF_INIT;
+		char *command = packet_key_val_read("command");
+
+		if (!command) {
+			fprintf(logfile, "STOP\n");
+			break;
+		}
+		fprintf(logfile, "IN: %s", command);
+
+		if (!strcmp(command, "list_available_blobs")) {
+			reply_list_available_blobs_cmd();
+			free(command);
+			continue;
+		}
+
+		pathname = packet_key_val_read("pathname");
+		if (!pathname)
+			die("unexpected EOF while expecting pathname");
+		fprintf(logfile, " %s", pathname);
+
+		/* Read until flush */
+		while ((buf = packet_read_line(0, NULL))) {
+			if (!strcmp(buf, "can-delay=1")) {
+				entry = strmap_get(&delay, pathname);
+				if (entry && !entry->requested)
+					entry->requested = 1;
+				else if (!entry && always_delay)
+					add_delay_entry(pathname, 1, 1);
+			} else if (starts_with(buf, "ref=") ||
+				   starts_with(buf, "treeish=") ||
+				   starts_with(buf, "blob=")) {
+				fprintf(logfile, " %s", buf);
+			} else {
+				/*
+				 * In general, filters need to be graceful about
+				 * new metadata, since it's documented that we
+				 * can pass any key-value pairs, but for tests,
+				 * let's be a little stricter.
+				 */
+				die("Unknown message '%s'", buf);
+			}
+		}
+
+		read_packetized_to_strbuf(0, &input, 0);
+		fprintf(logfile, " %"PRIuMAX" [OK] -- ", (uintmax_t)input.len);
+
+		entry = strmap_get(&delay, pathname);
+		if (entry && entry->output) {
+			output = entry->output;
+		} else if (!strcmp(pathname, "error.r") || !strcmp(pathname, "abort.r")) {
+			output = "";
+		} else if (!strcmp(command, "clean") && has_clean_cap) {
+			output = rot13(input.buf);
+		} else if (!strcmp(command, "smudge") && has_smudge_cap) {
+			output = rot13(input.buf);
+		} else {
+			die("bad command '%s'", command);
+		}
+
+		if (!strcmp(pathname, "error.r")) {
+			fprintf(logfile, "[ERROR]\n");
+			packet_write_fmt(1, "status=error");
+			packet_flush(1);
+		} else if (!strcmp(pathname, "abort.r")) {
+			fprintf(logfile, "[ABORT]\n");
+			packet_write_fmt(1, "status=abort");
+			packet_flush(1);
+		} else if (!strcmp(command, "smudge") &&
+			   (entry = strmap_get(&delay, pathname)) &&
+			   entry->requested == 1) {
+			fprintf(logfile, "[DELAYED]\n");
+			packet_write_fmt(1, "status=delayed");
+			packet_flush(1);
+			entry->requested = 2;
+			if (entry->output != output) {
+				free(entry->output);
+				entry->output = xstrdup(output);
+			}
+		} else {
+			int i, nr_packets = 0;
+			size_t output_len;
+			const char *p;
+			packet_write_fmt(1, "status=success");
+			packet_flush(1);
+
+			if (skip_prefix(pathname, command, &p) &&
+			    !strcmp(p, "-write-fail.r")) {
+				fprintf(logfile, "[WRITE FAIL]\n");
+				die("%s write error", command);
+			}
+
+			output_len = strlen(output);
+			fprintf(logfile, "OUT: %"PRIuMAX" ", (uintmax_t)output_len);
+
+			if (write_packetized_from_buf_no_flush_count(output,
+				output_len, 1, &nr_packets))
+				die("failed to write buffer to stdout");
+			packet_flush(1);
+
+			for (i = 0; i < nr_packets; i++)
+				fprintf(logfile, ".");
+			fprintf(logfile, " [OK]\n");
+
+			packet_flush(1);
+		}
+		free(pathname);
+		strbuf_release(&input);
+		free(command);
+	}
+}
+
+static void packet_initialize(void)
+{
+	char *pkt_buf = packet_read_line(0, NULL);
+
+	if (!pkt_buf || strcmp(pkt_buf, "git-filter-client"))
+		die("bad initialize: '%s'", str_or_null(pkt_buf));
+
+	pkt_buf = packet_read_line(0, NULL);
+	if (!pkt_buf || strcmp(pkt_buf, "version=2"))
+		die("bad version: '%s'", str_or_null(pkt_buf));
+
+	pkt_buf = packet_read_line(0, NULL);
+	if (pkt_buf)
+		die("bad version end: '%s'", pkt_buf);
+
+	packet_write_fmt(1, "git-filter-server");
+	packet_write_fmt(1, "version=2");
+	packet_flush(1);
+}
+
+static const char *rot13_usage[] = {
+	"test-tool rot13-filter [--always-delay] --log=<path> <capabilities>",
+	NULL
+};
+
+int cmd__rot13_filter(int argc, const char **argv)
+{
+	int i, nr_caps;
+	struct strset remote_caps = STRSET_INIT;
+	const char *log_path = NULL;
+
+	struct option options[] = {
+		OPT_BOOL(0, "always-delay", &always_delay,
+			 "delay all paths with the can-delay flag"),
+		OPT_STRING(0, "log", &log_path, "path",
+			   "path to the debug log file"),
+		OPT_END()
+	};
+	nr_caps = parse_options(argc, argv, NULL, options, rot13_usage,
+				PARSE_OPT_STOP_AT_NON_OPTION);
+
+	if (!log_path || !nr_caps)
+		usage_with_options(rot13_usage, options);
+
+	logfile = fopen(log_path, "a");
+	if (!logfile)
+		die_errno("failed to open log file");
+
+	for (i = 0; i < nr_caps; i++) {
+		if (!strcmp(argv[i], "smudge"))
+			has_smudge_cap = 1;
+		if (!strcmp(argv[i], "clean"))
+			has_clean_cap = 1;
+	}
+
+	add_delay_entry("test-delay10.a", 1, 0);
+	add_delay_entry("test-delay11.a", 1, 0);
+	add_delay_entry("test-delay20.a", 2, 0);
+	add_delay_entry("test-delay10.b", 1, 0);
+	add_delay_entry("missing-delay.a", 1, 0);
+	add_delay_entry("invalid-delay.a", 1, 0);
+
+	fprintf(logfile, "START\n");
+	packet_initialize();
+
+	read_capabilities(&remote_caps);
+	check_and_write_capabilities(&remote_caps, argv, nr_caps);
+	fprintf(logfile, "init handshake complete\n");
+	strset_clear(&remote_caps);
+
+	command_loop();
+
+	if (fclose(logfile))
+		die_errno("error closing logfile");
+	free_delay_entries();
+	return 0;
+}
diff --git a/t/helper/test-run-command.c b/t/helper/test-run-command.c
index 7ae03dc..c0ed872 100644
--- a/t/helper/test-run-command.c
+++ b/t/helper/test-run-command.c
@@ -9,8 +9,6 @@
  */
 
 #include "test-tool.h"
-#include "git-compat-util.h"
-#include "cache.h"
 #include "run-command.h"
 #include "strvec.h"
 #include "strbuf.h"
@@ -18,40 +16,48 @@
 #include "string-list.h"
 #include "thread-utils.h"
 #include "wildmatch.h"
-#include "gettext.h"
-#include "parse-options.h"
 
 static int number_callbacks;
 static int parallel_next(struct child_process *cp,
 			 struct strbuf *err,
 			 void *cb,
-			 void **task_cb)
+			 void **task_cb UNUSED)
 {
 	struct child_process *d = cb;
 	if (number_callbacks >= 4)
 		return 0;
 
-	strvec_pushv(&cp->args, d->argv);
-	strbuf_addstr(err, "preloaded output of a child\n");
+	strvec_pushv(&cp->args, d->args.v);
+	if (err)
+		strbuf_addstr(err, "preloaded output of a child\n");
+	else
+		fprintf(stderr, "preloaded output of a child\n");
+
 	number_callbacks++;
 	return 1;
 }
 
-static int no_job(struct child_process *cp,
+static int no_job(struct child_process *cp UNUSED,
 		  struct strbuf *err,
-		  void *cb,
-		  void **task_cb)
+		  void *cb UNUSED,
+		  void **task_cb UNUSED)
 {
-	strbuf_addstr(err, "no further jobs available\n");
+	if (err)
+		strbuf_addstr(err, "no further jobs available\n");
+	else
+		fprintf(stderr, "no further jobs available\n");
 	return 0;
 }
 
-static int task_finished(int result,
+static int task_finished(int result UNUSED,
 			 struct strbuf *err,
-			 void *pp_cb,
-			 void *pp_task_cb)
+			 void *pp_cb UNUSED,
+			 void *pp_task_cb UNUSED)
 {
-	strbuf_addstr(err, "asking for a quick stop\n");
+	if (err)
+		strbuf_addstr(err, "asking for a quick stop\n");
+	else
+		fprintf(stderr, "asking for a quick stop\n");
 	return 1;
 }
 
@@ -60,8 +66,10 @@ struct testsuite {
 	int next;
 	int quiet, immediate, verbose, verbose_log, trace, write_junit_xml;
 };
-#define TESTSUITE_INIT \
-	{ STRING_LIST_INIT_DUP, STRING_LIST_INIT_DUP, -1, 0, 0, 0, 0, 0, 0 }
+#define TESTSUITE_INIT { \
+	.tests = STRING_LIST_INIT_DUP, \
+	.failed = STRING_LIST_INIT_DUP, \
+}
 
 static int next_test(struct child_process *cp, struct strbuf *err, void *cb,
 		     void **task_cb)
@@ -125,7 +133,7 @@ static const char * const testsuite_usage[] = {
 static int testsuite(int argc, const char **argv)
 {
 	struct testsuite suite = TESTSUITE_INIT;
-	int max_jobs = 1, i, ret;
+	int max_jobs = 1, i, ret = 0;
 	DIR *dir;
 	struct dirent *d;
 	struct option options[] = {
@@ -141,9 +149,12 @@ static int testsuite(int argc, const char **argv)
 			 "write JUnit-style XML files"),
 		OPT_END()
 	};
-
-	memset(&suite, 0, sizeof(suite));
-	suite.tests.strdup_strings = suite.failed.strdup_strings = 1;
+	struct run_process_parallel_opts opts = {
+		.get_next_task = next_test,
+		.start_failure = test_failed,
+		.task_finished = test_finished,
+		.data = &suite,
+	};
 
 	argc = parse_options(argc, argv, NULL, options,
 			testsuite_usage, PARSE_OPT_STOP_AT_NON_OPTION);
@@ -181,15 +192,16 @@ static int testsuite(int argc, const char **argv)
 	if (max_jobs > suite.tests.nr)
 		max_jobs = suite.tests.nr;
 
-	fprintf(stderr, "Running %d tests (%d at a time)\n",
-		suite.tests.nr, max_jobs);
+	fprintf(stderr, "Running %"PRIuMAX" tests (%d at a time)\n",
+		(uintmax_t)suite.tests.nr, max_jobs);
 
-	ret = run_processes_parallel(max_jobs, next_test, test_failed,
-				     test_finished, &suite);
+	opts.processes = max_jobs;
+	run_processes_parallel(&opts);
 
 	if (suite.failed.nr > 0) {
 		ret = 1;
-		fprintf(stderr, "%d tests failed:\n\n", suite.failed.nr);
+		fprintf(stderr, "%"PRIuMAX" tests failed:\n\n",
+			(uintmax_t)suite.failed.nr);
 		for (i = 0; i < suite.failed.nr; i++)
 			fprintf(stderr, "\t%s\n", suite.failed.items[i].string);
 	}
@@ -197,7 +209,7 @@ static int testsuite(int argc, const char **argv)
 	string_list_clear(&suite.tests, 0);
 	string_list_clear(&suite.failed, 0);
 
-	return !!ret;
+	return ret;
 }
 
 static uint64_t my_random_next = 1234;
@@ -222,9 +234,9 @@ static int quote_stress_test(int argc, const char **argv)
 	struct strbuf out = STRBUF_INIT;
 	struct strvec args = STRVEC_INIT;
 	struct option options[] = {
-		OPT_INTEGER('n', "trials", &trials, "Number of trials"),
-		OPT_INTEGER('s', "skip", &skip, "Skip <n> trials"),
-		OPT_BOOL('m', "msys2", &msys2, "Test quoting for MSYS2's sh"),
+		OPT_INTEGER('n', "trials", &trials, "number of trials"),
+		OPT_INTEGER('s', "skip", &skip, "skip <n> trials"),
+		OPT_BOOL('m', "msys2", &msys2, "test quoting for MSYS2's sh"),
 		OPT_END()
 	};
 	const char * const usage[] = {
@@ -275,7 +287,7 @@ static int quote_stress_test(int argc, const char **argv)
 		if (i < skip)
 			continue;
 
-		cp.argv = args.v;
+		strvec_pushv(&cp.args, args.v);
 		strbuf_reset(&out);
 		if (pipe_command(&cp, NULL, 0, &out, 0, NULL, 0) < 0)
 			return error("Failed to spawn child process");
@@ -372,13 +384,17 @@ int cmd__run_command(int argc, const char **argv)
 {
 	struct child_process proc = CHILD_PROCESS_INIT;
 	int jobs;
+	int ret;
+	struct run_process_parallel_opts opts = {
+		.data = &proc,
+	};
 
 	if (argc > 1 && !strcmp(argv[1], "testsuite"))
-		exit(testsuite(argc - 1, argv + 1));
+		return testsuite(argc - 1, argv + 1);
 	if (!strcmp(argv[1], "inherited-handle"))
-		exit(inherit_handle(argv[0]));
+		return inherit_handle(argv[0]);
 	if (!strcmp(argv[1], "inherited-handle-child"))
-		exit(inherit_handle_child());
+		return inherit_handle_child();
 
 	if (argc >= 2 && !strcmp(argv[1], "quote-stress-test"))
 		return !!quote_stress_test(argc - 1, argv + 1);
@@ -391,38 +407,56 @@ int cmd__run_command(int argc, const char **argv)
 	while (!strcmp(argv[1], "env")) {
 		if (!argv[2])
 			die("env specifier without a value");
-		strvec_push(&proc.env_array, argv[2]);
+		strvec_push(&proc.env, argv[2]);
 		argv += 2;
 		argc -= 2;
 	}
-	if (argc < 3)
-		return 1;
-	proc.argv = (const char **)argv + 2;
+	if (argc < 3) {
+		ret = 1;
+		goto cleanup;
+	}
+	strvec_pushv(&proc.args, (const char **)argv + 2);
 
 	if (!strcmp(argv[1], "start-command-ENOENT")) {
-		if (start_command(&proc) < 0 && errno == ENOENT)
-			return 0;
+		if (start_command(&proc) < 0 && errno == ENOENT) {
+			ret = 0;
+			goto cleanup;
+		}
 		fprintf(stderr, "FAIL %s\n", argv[1]);
 		return 1;
 	}
-	if (!strcmp(argv[1], "run-command"))
-		exit(run_command(&proc));
-
-	jobs = atoi(argv[2]);
-	proc.argv = (const char **)argv + 3;
-
-	if (!strcmp(argv[1], "run-command-parallel"))
-		exit(run_processes_parallel(jobs, parallel_next,
-					    NULL, NULL, &proc));
-
-	if (!strcmp(argv[1], "run-command-abort"))
-		exit(run_processes_parallel(jobs, parallel_next,
-					    NULL, task_finished, &proc));
+	if (!strcmp(argv[1], "run-command")) {
+		ret = run_command(&proc);
+		goto cleanup;
+	}
 
-	if (!strcmp(argv[1], "run-command-no-jobs"))
-		exit(run_processes_parallel(jobs, no_job,
-					    NULL, task_finished, &proc));
+	if (!strcmp(argv[1], "--ungroup")) {
+		argv += 1;
+		argc -= 1;
+		opts.ungroup = 1;
+	}
 
-	fprintf(stderr, "check usage\n");
-	return 1;
+	jobs = atoi(argv[2]);
+	strvec_clear(&proc.args);
+	strvec_pushv(&proc.args, (const char **)argv + 3);
+
+	if (!strcmp(argv[1], "run-command-parallel")) {
+		opts.get_next_task = parallel_next;
+	} else if (!strcmp(argv[1], "run-command-abort")) {
+		opts.get_next_task = parallel_next;
+		opts.task_finished = task_finished;
+	} else if (!strcmp(argv[1], "run-command-no-jobs")) {
+		opts.get_next_task = no_job;
+		opts.task_finished = task_finished;
+	} else {
+		ret = 1;
+		fprintf(stderr, "check usage\n");
+		goto cleanup;
+	}
+	opts.processes = jobs;
+	run_processes_parallel(&opts);
+	ret = 0;
+cleanup:
+	child_process_clear(&proc);
+	return ret;
 }
diff --git a/t/helper/test-scrap-cache-tree.c b/t/helper/test-scrap-cache-tree.c
index 393f160..0a816a9 100644
--- a/t/helper/test-scrap-cache-tree.c
+++ b/t/helper/test-scrap-cache-tree.c
@@ -1,18 +1,22 @@
+#define USE_THE_INDEX_VARIABLE
 #include "test-tool.h"
-#include "cache.h"
 #include "lockfile.h"
+#include "read-cache-ll.h"
+#include "repository.h"
+#include "setup.h"
 #include "tree.h"
 #include "cache-tree.h"
 
-int cmd__scrap_cache_tree(int ac, const char **av)
+int cmd__scrap_cache_tree(int ac UNUSED, const char **av UNUSED)
 {
 	struct lock_file index_lock = LOCK_INIT;
 
 	setup_git_directory();
-	hold_locked_index(&index_lock, LOCK_DIE_ON_ERROR);
-	if (read_cache() < 0)
+	repo_hold_locked_index(the_repository, &index_lock, LOCK_DIE_ON_ERROR);
+	if (repo_read_index(the_repository) < 0)
 		die("unable to read index file");
-	active_cache_tree = NULL;
+	cache_tree_free(&the_index.cache_tree);
+	the_index.cache_tree = NULL;
 	if (write_locked_index(&the_index, &index_lock, COMMIT_LOCK))
 		die("unable to write index file");
 	return 0;
diff --git a/t/helper/test-serve-v2.c b/t/helper/test-serve-v2.c
index aee35e5..054cbcf 100644
--- a/t/helper/test-serve-v2.c
+++ b/t/helper/test-serve-v2.c
@@ -1,7 +1,8 @@
 #include "test-tool.h"
-#include "cache.h"
+#include "gettext.h"
 #include "parse-options.h"
 #include "serve.h"
+#include "setup.h"
 
 static char const * const serve_usage[] = {
 	N_("test-tool serve-v2 [<options>]"),
@@ -10,12 +11,12 @@ static char const * const serve_usage[] = {
 
 int cmd__serve_v2(int argc, const char **argv)
 {
-	struct serve_options opts = SERVE_OPTIONS_INIT;
-
+	int stateless_rpc = 0;
+	int advertise_capabilities = 0;
 	struct option options[] = {
-		OPT_BOOL(0, "stateless-rpc", &opts.stateless_rpc,
+		OPT_BOOL(0, "stateless-rpc", &stateless_rpc,
 			 N_("quit after a single request/response exchange")),
-		OPT_BOOL(0, "advertise-capabilities", &opts.advertise_capabilities,
+		OPT_BOOL(0, "advertise-capabilities", &advertise_capabilities,
 			 N_("exit immediately after advertising capabilities")),
 		OPT_END()
 	};
@@ -24,8 +25,12 @@ int cmd__serve_v2(int argc, const char **argv)
 	/* ignore all unknown cmdline switches for now */
 	argc = parse_options(argc, argv, prefix, options, serve_usage,
 			     PARSE_OPT_KEEP_DASHDASH |
-			     PARSE_OPT_KEEP_UNKNOWN);
-	serve(&opts);
+			     PARSE_OPT_KEEP_UNKNOWN_OPT);
+
+	if (advertise_capabilities)
+		protocol_v2_advertise_capabilities();
+	else
+		protocol_v2_serve_loop(stateless_rpc);
 
 	return 0;
 }
diff --git a/t/helper/test-sha1.c b/t/helper/test-sha1.c
index d860c38..dcb7f6c 100644
--- a/t/helper/test-sha1.c
+++ b/t/helper/test-sha1.c
@@ -1,7 +1,15 @@
 #include "test-tool.h"
-#include "cache.h"
+#include "hash-ll.h"
 
 int cmd__sha1(int ac, const char **av)
 {
 	return cmd_hash_impl(ac, av, GIT_HASH_SHA1);
 }
+
+int cmd__sha1_is_sha1dc(int argc UNUSED, const char **argv UNUSED)
+{
+#ifdef platform_SHA_IS_SHA1DC
+	return 0;
+#endif
+	return 1;
+}
diff --git a/t/helper/test-sha256.c b/t/helper/test-sha256.c
index 0ac6a99..08cf149 100644
--- a/t/helper/test-sha256.c
+++ b/t/helper/test-sha256.c
@@ -1,5 +1,5 @@
 #include "test-tool.h"
-#include "cache.h"
+#include "hash-ll.h"
 
 int cmd__sha256(int ac, const char **av)
 {
diff --git a/t/helper/test-sigchain.c b/t/helper/test-sigchain.c
index d013bcc..2d5ecf7 100644
--- a/t/helper/test-sigchain.c
+++ b/t/helper/test-sigchain.c
@@ -1,5 +1,4 @@
 #include "test-tool.h"
-#include "cache.h"
 #include "sigchain.h"
 
 #define X(f) \
@@ -14,7 +13,7 @@ X(two)
 X(three)
 #undef X
 
-int cmd__sigchain(int argc, const char **argv)
+int cmd__sigchain(int argc UNUSED, const char **argv UNUSED)
 {
 	sigchain_push(SIGTERM, one);
 	sigchain_push(SIGTERM, two);
diff --git a/t/helper/test-simple-ipc.c b/t/helper/test-simple-ipc.c
new file mode 100644
index 0000000..fb59277
--- /dev/null
+++ b/t/helper/test-simple-ipc.c
@@ -0,0 +1,687 @@
+/*
+ * test-simple-ipc.c: verify that the Inter-Process Communication works.
+ */
+
+#include "test-tool.h"
+#include "gettext.h"
+#include "simple-ipc.h"
+#include "parse-options.h"
+#include "thread-utils.h"
+#include "strvec.h"
+#include "run-command.h"
+#include "trace2.h"
+
+#ifndef SUPPORTS_SIMPLE_IPC
+int cmd__simple_ipc(int argc, const char **argv)
+{
+	die("simple IPC not available on this platform");
+}
+#else
+
+/*
+ * The test daemon defines an "application callback" that supports a
+ * series of commands (see `test_app_cb()`).
+ *
+ * Unknown commands are caught here and we send an error message back
+ * to the client process.
+ */
+static int app__unhandled_command(const char *command,
+				  ipc_server_reply_cb *reply_cb,
+				  struct ipc_server_reply_data *reply_data)
+{
+	struct strbuf buf = STRBUF_INIT;
+	int ret;
+
+	strbuf_addf(&buf, "unhandled command: %s", command);
+	ret = reply_cb(reply_data, buf.buf, buf.len);
+	strbuf_release(&buf);
+
+	return ret;
+}
+
+/*
+ * Reply with a single very large buffer.  This is to ensure that
+ * long response are properly handled -- whether the chunking occurs
+ * in the kernel or in the (probably pkt-line) layer.
+ */
+#define BIG_ROWS (10000)
+static int app__big_command(ipc_server_reply_cb *reply_cb,
+			    struct ipc_server_reply_data *reply_data)
+{
+	struct strbuf buf = STRBUF_INIT;
+	int row;
+	int ret;
+
+	for (row = 0; row < BIG_ROWS; row++)
+		strbuf_addf(&buf, "big: %.75d\n", row);
+
+	ret = reply_cb(reply_data, buf.buf, buf.len);
+	strbuf_release(&buf);
+
+	return ret;
+}
+
+/*
+ * Reply with a series of lines.  This is to ensure that we can incrementally
+ * compute the response and chunk it to the client.
+ */
+#define CHUNK_ROWS (10000)
+static int app__chunk_command(ipc_server_reply_cb *reply_cb,
+			      struct ipc_server_reply_data *reply_data)
+{
+	struct strbuf buf = STRBUF_INIT;
+	int row;
+	int ret;
+
+	for (row = 0; row < CHUNK_ROWS; row++) {
+		strbuf_setlen(&buf, 0);
+		strbuf_addf(&buf, "big: %.75d\n", row);
+		ret = reply_cb(reply_data, buf.buf, buf.len);
+	}
+
+	strbuf_release(&buf);
+
+	return ret;
+}
+
+/*
+ * Slowly reply with a series of lines.  This is to model an expensive to
+ * compute chunked response (which might happen if this callback is running
+ * in a thread and is fighting for a lock with other threads).
+ */
+#define SLOW_ROWS     (1000)
+#define SLOW_DELAY_MS (10)
+static int app__slow_command(ipc_server_reply_cb *reply_cb,
+			     struct ipc_server_reply_data *reply_data)
+{
+	struct strbuf buf = STRBUF_INIT;
+	int row;
+	int ret;
+
+	for (row = 0; row < SLOW_ROWS; row++) {
+		strbuf_setlen(&buf, 0);
+		strbuf_addf(&buf, "big: %.75d\n", row);
+		ret = reply_cb(reply_data, buf.buf, buf.len);
+		sleep_millisec(SLOW_DELAY_MS);
+	}
+
+	strbuf_release(&buf);
+
+	return ret;
+}
+
+/*
+ * The client sent a command followed by a (possibly very) large buffer.
+ */
+static int app__sendbytes_command(const char *received, size_t received_len,
+				  ipc_server_reply_cb *reply_cb,
+				  struct ipc_server_reply_data *reply_data)
+{
+	struct strbuf buf_resp = STRBUF_INIT;
+	const char *p = "?";
+	int len_ballast = 0;
+	int k;
+	int errs = 0;
+	int ret;
+
+	/*
+	 * The test is setup to send:
+	 *     "sendbytes" SP <n * char>
+	 */
+	if (received_len < strlen("sendbytes "))
+		BUG("received_len is short in app__sendbytes_command");
+
+	if (skip_prefix(received, "sendbytes ", &p))
+		len_ballast = strlen(p);
+
+	/*
+	 * Verify that the ballast is n copies of a single letter.
+	 * And that the multi-threaded IO layer didn't cross the streams.
+	 */
+	for (k = 1; k < len_ballast; k++)
+		if (p[k] != p[0])
+			errs++;
+
+	if (errs)
+		strbuf_addf(&buf_resp, "errs:%d\n", errs);
+	else
+		strbuf_addf(&buf_resp, "rcvd:%c%08d\n", p[0], len_ballast);
+
+	ret = reply_cb(reply_data, buf_resp.buf, buf_resp.len);
+
+	strbuf_release(&buf_resp);
+
+	return ret;
+}
+
+/*
+ * An arbitrary fixed address to verify that the application instance
+ * data is handled properly.
+ */
+static int my_app_data = 42;
+
+static ipc_server_application_cb test_app_cb;
+
+/*
+ * This is the "application callback" that sits on top of the
+ * "ipc-server".  It completely defines the set of commands supported
+ * by this application.
+ */
+static int test_app_cb(void *application_data,
+		       const char *command, size_t command_len,
+		       ipc_server_reply_cb *reply_cb,
+		       struct ipc_server_reply_data *reply_data)
+{
+	/*
+	 * Verify that we received the application-data that we passed
+	 * when we started the ipc-server.  (We have several layers of
+	 * callbacks calling callbacks and it's easy to get things mixed
+	 * up (especially when some are "void*").)
+	 */
+	if (application_data != (void*)&my_app_data)
+		BUG("application_cb: application_data pointer wrong");
+
+	if (command_len == 4 && !strncmp(command, "quit", 4)) {
+		/*
+		 * The client sent a "quit" command.  This is an async
+		 * request for the server to shutdown.
+		 *
+		 * We DO NOT send the client a response message
+		 * (because we have nothing to say and the other
+		 * server threads have not yet stopped).
+		 *
+		 * Tell the ipc-server layer to start shutting down.
+		 * This includes: stop listening for new connections
+		 * on the socket/pipe and telling all worker threads
+		 * to finish/drain their outgoing responses to other
+		 * clients.
+		 *
+		 * This DOES NOT force an immediate sync shutdown.
+		 */
+		return SIMPLE_IPC_QUIT;
+	}
+
+	if (command_len == 4 && !strncmp(command, "ping", 4)) {
+		const char *answer = "pong";
+		return reply_cb(reply_data, answer, strlen(answer));
+	}
+
+	if (command_len == 3 && !strncmp(command, "big", 3))
+		return app__big_command(reply_cb, reply_data);
+
+	if (command_len == 5 && !strncmp(command, "chunk", 5))
+		return app__chunk_command(reply_cb, reply_data);
+
+	if (command_len == 4 && !strncmp(command, "slow", 4))
+		return app__slow_command(reply_cb, reply_data);
+
+	if (command_len >= 10 && starts_with(command, "sendbytes "))
+		return app__sendbytes_command(command, command_len,
+					      reply_cb, reply_data);
+
+	return app__unhandled_command(command, reply_cb, reply_data);
+}
+
+struct cl_args
+{
+	const char *subcommand;
+	const char *path;
+	const char *token;
+
+	int nr_threads;
+	int max_wait_sec;
+	int bytecount;
+	int batchsize;
+
+	char bytevalue;
+};
+
+static struct cl_args cl_args = {
+	.subcommand = NULL,
+	.path = "ipc-test",
+	.token = NULL,
+
+	.nr_threads = 5,
+	.max_wait_sec = 60,
+	.bytecount = 1024,
+	.batchsize = 10,
+
+	.bytevalue = 'x',
+};
+
+/*
+ * This process will run as a simple-ipc server and listen for IPC commands
+ * from client processes.
+ */
+static int daemon__run_server(void)
+{
+	int ret;
+
+	struct ipc_server_opts opts = {
+		.nr_threads = cl_args.nr_threads,
+	};
+
+	/*
+	 * Synchronously run the ipc-server.  We don't need any application
+	 * instance data, so pass an arbitrary pointer (that we'll later
+	 * verify made the round trip).
+	 */
+	ret = ipc_server_run(cl_args.path, &opts, test_app_cb, (void*)&my_app_data);
+	if (ret == -2)
+		error("socket/pipe already in use: '%s'", cl_args.path);
+	else if (ret == -1)
+		error_errno("could not start server on: '%s'", cl_args.path);
+
+	return ret;
+}
+
+static start_bg_wait_cb bg_wait_cb;
+
+static int bg_wait_cb(const struct child_process *cp UNUSED,
+		      void *cb_data UNUSED)
+{
+	int s = ipc_get_active_state(cl_args.path);
+
+	switch (s) {
+	case IPC_STATE__LISTENING:
+		/* child is "ready" */
+		return 0;
+
+	case IPC_STATE__NOT_LISTENING:
+	case IPC_STATE__PATH_NOT_FOUND:
+		/* give child more time */
+		return 1;
+
+	default:
+	case IPC_STATE__INVALID_PATH:
+	case IPC_STATE__OTHER_ERROR:
+		/* all the time in world won't help */
+		return -1;
+	}
+}
+
+static int daemon__start_server(void)
+{
+	struct child_process cp = CHILD_PROCESS_INIT;
+	enum start_bg_result sbgr;
+
+	strvec_push(&cp.args, "test-tool");
+	strvec_push(&cp.args, "simple-ipc");
+	strvec_push(&cp.args, "run-daemon");
+	strvec_pushf(&cp.args, "--name=%s", cl_args.path);
+	strvec_pushf(&cp.args, "--threads=%d", cl_args.nr_threads);
+
+	cp.no_stdin = 1;
+	cp.no_stdout = 1;
+	cp.no_stderr = 1;
+
+	sbgr = start_bg_command(&cp, bg_wait_cb, NULL, cl_args.max_wait_sec);
+
+	switch (sbgr) {
+	case SBGR_READY:
+		return 0;
+
+	default:
+	case SBGR_ERROR:
+	case SBGR_CB_ERROR:
+		return error("daemon failed to start");
+
+	case SBGR_TIMEOUT:
+		return error("daemon not online yet");
+
+	case SBGR_DIED:
+		return error("daemon terminated");
+	}
+}
+
+/*
+ * This process will run a quick probe to see if a simple-ipc server
+ * is active on this path.
+ *
+ * Returns 0 if the server is alive.
+ */
+static int client__probe_server(void)
+{
+	enum ipc_active_state s;
+
+	s = ipc_get_active_state(cl_args.path);
+	switch (s) {
+	case IPC_STATE__LISTENING:
+		return 0;
+
+	case IPC_STATE__NOT_LISTENING:
+		return error("no server listening at '%s'", cl_args.path);
+
+	case IPC_STATE__PATH_NOT_FOUND:
+		return error("path not found '%s'", cl_args.path);
+
+	case IPC_STATE__INVALID_PATH:
+		return error("invalid pipe/socket name '%s'", cl_args.path);
+
+	case IPC_STATE__OTHER_ERROR:
+	default:
+		return error("other error for '%s'", cl_args.path);
+	}
+}
+
+/*
+ * Send an IPC command token to an already-running server daemon and
+ * print the response.
+ *
+ * This is a simple 1 word command/token that `test_app_cb()` (in the
+ * daemon process) will understand.
+ */
+static int client__send_ipc(void)
+{
+	const char *command = "(no-command)";
+	struct strbuf buf = STRBUF_INIT;
+	struct ipc_client_connect_options options
+		= IPC_CLIENT_CONNECT_OPTIONS_INIT;
+
+	if (cl_args.token && *cl_args.token)
+		command = cl_args.token;
+
+	options.wait_if_busy = 1;
+	options.wait_if_not_found = 0;
+
+	if (!ipc_client_send_command(cl_args.path, &options,
+				     command, strlen(command),
+				     &buf)) {
+		if (buf.len) {
+			printf("%s\n", buf.buf);
+			fflush(stdout);
+		}
+		strbuf_release(&buf);
+
+		return 0;
+	}
+
+	return error("failed to send '%s' to '%s'", command, cl_args.path);
+}
+
+/*
+ * Send an IPC command to an already-running server and ask it to
+ * shutdown.  "send quit" is an async request and queues a shutdown
+ * event in the server, so we spin and wait here for it to actually
+ * shutdown to make the unit tests a little easier to write.
+ */
+static int client__stop_server(void)
+{
+	int ret;
+	time_t time_limit, now;
+	enum ipc_active_state s;
+
+	time(&time_limit);
+	time_limit += cl_args.max_wait_sec;
+
+	cl_args.token = "quit";
+
+	ret = client__send_ipc();
+	if (ret)
+		return ret;
+
+	for (;;) {
+		sleep_millisec(100);
+
+		s = ipc_get_active_state(cl_args.path);
+
+		if (s != IPC_STATE__LISTENING) {
+			/*
+			 * The socket/pipe is gone and/or has stopped
+			 * responding.  Lets assume that the daemon
+			 * process has exited too.
+			 */
+			return 0;
+		}
+
+		time(&now);
+		if (now > time_limit)
+			return error("daemon has not shutdown yet");
+	}
+}
+
+/*
+ * Send an IPC command followed by ballast to confirm that a large
+ * message can be sent and that the kernel or pkt-line layers will
+ * properly chunk it and that the daemon receives the entire message.
+ */
+static int do_sendbytes(int bytecount, char byte, const char *path,
+			const struct ipc_client_connect_options *options)
+{
+	struct strbuf buf_send = STRBUF_INIT;
+	struct strbuf buf_resp = STRBUF_INIT;
+
+	strbuf_addstr(&buf_send, "sendbytes ");
+	strbuf_addchars(&buf_send, byte, bytecount);
+
+	if (!ipc_client_send_command(path, options,
+				     buf_send.buf, buf_send.len,
+				     &buf_resp)) {
+		strbuf_rtrim(&buf_resp);
+		printf("sent:%c%08d %s\n", byte, bytecount, buf_resp.buf);
+		fflush(stdout);
+		strbuf_release(&buf_send);
+		strbuf_release(&buf_resp);
+
+		return 0;
+	}
+
+	return error("client failed to sendbytes(%d, '%c') to '%s'",
+		     bytecount, byte, path);
+}
+
+/*
+ * Send an IPC command with ballast to an already-running server daemon.
+ */
+static int client__sendbytes(void)
+{
+	struct ipc_client_connect_options options
+		= IPC_CLIENT_CONNECT_OPTIONS_INIT;
+
+	options.wait_if_busy = 1;
+	options.wait_if_not_found = 0;
+	options.uds_disallow_chdir = 0;
+
+	return do_sendbytes(cl_args.bytecount, cl_args.bytevalue, cl_args.path,
+			    &options);
+}
+
+struct multiple_thread_data {
+	pthread_t pthread_id;
+	struct multiple_thread_data *next;
+	const char *path;
+	int bytecount;
+	int batchsize;
+	int sum_errors;
+	int sum_good;
+	char letter;
+};
+
+static void *multiple_thread_proc(void *_multiple_thread_data)
+{
+	struct multiple_thread_data *d = _multiple_thread_data;
+	int k;
+	struct ipc_client_connect_options options
+		= IPC_CLIENT_CONNECT_OPTIONS_INIT;
+
+	options.wait_if_busy = 1;
+	options.wait_if_not_found = 0;
+	/*
+	 * A multi-threaded client should not be randomly calling chdir().
+	 * The test will pass without this restriction because the test is
+	 * not otherwise accessing the filesystem, but it makes us honest.
+	 */
+	options.uds_disallow_chdir = 1;
+
+	trace2_thread_start("multiple");
+
+	for (k = 0; k < d->batchsize; k++) {
+		if (do_sendbytes(d->bytecount + k, d->letter, d->path, &options))
+			d->sum_errors++;
+		else
+			d->sum_good++;
+	}
+
+	trace2_thread_exit();
+	return NULL;
+}
+
+/*
+ * Start a client-side thread pool.  Each thread sends a series of
+ * IPC requests.  Each request is on a new connection to the server.
+ */
+static int client__multiple(void)
+{
+	struct multiple_thread_data *list = NULL;
+	int k;
+	int sum_join_errors = 0;
+	int sum_thread_errors = 0;
+	int sum_good = 0;
+
+	for (k = 0; k < cl_args.nr_threads; k++) {
+		struct multiple_thread_data *d = xcalloc(1, sizeof(*d));
+		d->next = list;
+		d->path = cl_args.path;
+		d->bytecount = cl_args.bytecount + cl_args.batchsize*(k/26);
+		d->batchsize = cl_args.batchsize;
+		d->sum_errors = 0;
+		d->sum_good = 0;
+		d->letter = 'A' + (k % 26);
+
+		if (pthread_create(&d->pthread_id, NULL, multiple_thread_proc, d)) {
+			warning("failed to create thread[%d] skipping remainder", k);
+			free(d);
+			break;
+		}
+
+		list = d;
+	}
+
+	while (list) {
+		struct multiple_thread_data *d = list;
+
+		if (pthread_join(d->pthread_id, NULL))
+			sum_join_errors++;
+
+		sum_thread_errors += d->sum_errors;
+		sum_good += d->sum_good;
+
+		list = d->next;
+		free(d);
+	}
+
+	printf("client (good %d) (join %d), (errors %d)\n",
+	       sum_good, sum_join_errors, sum_thread_errors);
+
+	return (sum_join_errors + sum_thread_errors) ? 1 : 0;
+}
+
+int cmd__simple_ipc(int argc, const char **argv)
+{
+	const char * const simple_ipc_usage[] = {
+		N_("test-helper simple-ipc is-active    [<name>] [<options>]"),
+		N_("test-helper simple-ipc run-daemon   [<name>] [<threads>]"),
+		N_("test-helper simple-ipc start-daemon [<name>] [<threads>] [<max-wait>]"),
+		N_("test-helper simple-ipc stop-daemon  [<name>] [<max-wait>]"),
+		N_("test-helper simple-ipc send         [<name>] [<token>]"),
+		N_("test-helper simple-ipc sendbytes    [<name>] [<bytecount>] [<byte>]"),
+		N_("test-helper simple-ipc multiple     [<name>] [<threads>] [<bytecount>] [<batchsize>]"),
+		NULL
+	};
+
+	const char *bytevalue = NULL;
+
+	struct option options[] = {
+#ifndef GIT_WINDOWS_NATIVE
+		OPT_STRING(0, "name", &cl_args.path, N_("name"), N_("name or pathname of unix domain socket")),
+#else
+		OPT_STRING(0, "name", &cl_args.path, N_("name"), N_("named-pipe name")),
+#endif
+		OPT_INTEGER(0, "threads", &cl_args.nr_threads, N_("number of threads in server thread pool")),
+		OPT_INTEGER(0, "max-wait", &cl_args.max_wait_sec, N_("seconds to wait for daemon to start or stop")),
+
+		OPT_INTEGER(0, "bytecount", &cl_args.bytecount, N_("number of bytes")),
+		OPT_INTEGER(0, "batchsize", &cl_args.batchsize, N_("number of requests per thread")),
+
+		OPT_STRING(0, "byte", &bytevalue, N_("byte"), N_("ballast character")),
+		OPT_STRING(0, "token", &cl_args.token, N_("token"), N_("command token to send to the server")),
+
+		OPT_END()
+	};
+
+	if (argc < 2)
+		usage_with_options(simple_ipc_usage, options);
+
+	if (argc == 2 && !strcmp(argv[1], "-h"))
+		usage_with_options(simple_ipc_usage, options);
+
+	if (argc == 2 && !strcmp(argv[1], "SUPPORTS_SIMPLE_IPC"))
+		return 0;
+
+	cl_args.subcommand = argv[1];
+
+	argc--;
+	argv++;
+
+	argc = parse_options(argc, argv, NULL, options, simple_ipc_usage, 0);
+
+	if (cl_args.nr_threads < 1)
+		cl_args.nr_threads = 1;
+	if (cl_args.max_wait_sec < 0)
+		cl_args.max_wait_sec = 0;
+	if (cl_args.bytecount < 1)
+		cl_args.bytecount = 1;
+	if (cl_args.batchsize < 1)
+		cl_args.batchsize = 1;
+
+	if (bytevalue && *bytevalue)
+		cl_args.bytevalue = bytevalue[0];
+
+	/*
+	 * Use '!!' on all dispatch functions to map from `error()` style
+	 * (returns -1) style to `test_must_fail` style (expects 1).  This
+	 * makes shell error messages less confusing.
+	 */
+
+	if (!strcmp(cl_args.subcommand, "is-active"))
+		return !!client__probe_server();
+
+	if (!strcmp(cl_args.subcommand, "run-daemon"))
+		return !!daemon__run_server();
+
+	if (!strcmp(cl_args.subcommand, "start-daemon"))
+		return !!daemon__start_server();
+
+	/*
+	 * Client commands follow.  Ensure a server is running before
+	 * sending any data.  This might be overkill, but then again
+	 * this is a test harness.
+	 */
+
+	if (!strcmp(cl_args.subcommand, "stop-daemon")) {
+		if (client__probe_server())
+			return 1;
+		return !!client__stop_server();
+	}
+
+	if (!strcmp(cl_args.subcommand, "send")) {
+		if (client__probe_server())
+			return 1;
+		return !!client__send_ipc();
+	}
+
+	if (!strcmp(cl_args.subcommand, "sendbytes")) {
+		if (client__probe_server())
+			return 1;
+		return !!client__sendbytes();
+	}
+
+	if (!strcmp(cl_args.subcommand, "multiple")) {
+		if (client__probe_server())
+			return 1;
+		return !!client__multiple();
+	}
+
+	die("Unhandled subcommand: '%s'", cl_args.subcommand);
+}
+#endif
diff --git a/t/helper/test-strcmp-offset.c b/t/helper/test-strcmp-offset.c
index 44e4a6d..d8473cf 100644
--- a/t/helper/test-strcmp-offset.c
+++ b/t/helper/test-strcmp-offset.c
@@ -1,7 +1,7 @@
 #include "test-tool.h"
-#include "cache.h"
+#include "read-cache-ll.h"
 
-int cmd__strcmp_offset(int argc, const char **argv)
+int cmd__strcmp_offset(int argc UNUSED, const char **argv)
 {
 	int result;
 	size_t offset;
diff --git a/t/helper/test-string-list.c b/t/helper/test-string-list.c
index 2123dda..e2aad61 100644
--- a/t/helper/test-string-list.c
+++ b/t/helper/test-string-list.c
@@ -1,5 +1,5 @@
 #include "test-tool.h"
-#include "cache.h"
+#include "strbuf.h"
 #include "string-list.h"
 
 /*
@@ -62,7 +62,7 @@ int cmd__string_list(int argc, const char **argv)
 		struct string_list list = STRING_LIST_INIT_NODUP;
 		int i;
 		char *s = xstrdup(argv[2]);
-		int delim = *argv[3];
+		const char *delim = argv[3];
 		int maxsplit = atoi(argv[4]);
 
 		i = string_list_split_in_place(&list, s, delim, maxsplit);
@@ -111,7 +111,7 @@ int cmd__string_list(int argc, const char **argv)
 		 */
 		if (sb.len && sb.buf[sb.len - 1] == '\n')
 			strbuf_setlen(&sb, sb.len - 1);
-		string_list_split_in_place(&list, sb.buf, '\n', -1);
+		string_list_split_in_place(&list, sb.buf, "\n", -1);
 
 		string_list_sort(&list);
 
diff --git a/t/helper/test-submodule-config.c b/t/helper/test-submodule-config.c
index e269274..9df2f03 100644
--- a/t/helper/test-submodule-config.c
+++ b/t/helper/test-submodule-config.c
@@ -1,10 +1,13 @@
 #include "test-tool.h"
-#include "cache.h"
 #include "config.h"
+#include "hash.h"
+#include "object-name.h"
+#include "repository.h"
+#include "setup.h"
 #include "submodule-config.h"
 #include "submodule.h"
 
-static void die_usage(int argc, const char **argv, const char *msg)
+static void die_usage(int argc UNUSED, const char **argv, const char *msg)
 {
 	fprintf(stderr, "%s\n", msg);
 	fprintf(stderr, "Usage: %s [<commit> <submodulepath>] ...\n", argv[0]);
@@ -15,14 +18,11 @@ int cmd__submodule_config(int argc, const char **argv)
 {
 	const char **arg = argv;
 	int my_argc = argc;
-	int output_url = 0;
 	int lookup_name = 0;
 
 	arg++;
 	my_argc--;
 	while (arg[0] && starts_with(arg[0], "--")) {
-		if (!strcmp(arg[0], "--url"))
-			output_url = 1;
 		if (!strcmp(arg[0], "--name"))
 			lookup_name = 1;
 		arg++;
@@ -45,7 +45,7 @@ int cmd__submodule_config(int argc, const char **argv)
 
 		if (commit[0] == '\0')
 			oidclr(&commit_oid);
-		else if (get_oid(commit, &commit_oid) < 0)
+		else if (repo_get_oid(the_repository, commit, &commit_oid) < 0)
 			die_usage(argc, argv, "Commit not found.");
 
 		if (lookup_name) {
@@ -57,12 +57,8 @@ int cmd__submodule_config(int argc, const char **argv)
 		if (!submodule)
 			die_usage(argc, argv, "Submodule not found.");
 
-		if (output_url)
-			printf("Submodule url: '%s' for path '%s'\n",
-					submodule->url, submodule->path);
-		else
-			printf("Submodule name: '%s' for path '%s'\n",
-					submodule->name, submodule->path);
+		printf("Submodule name: '%s' for path '%s'\n", submodule->name,
+		       submodule->path);
 
 		arg += 2;
 	}
diff --git a/t/helper/test-submodule-nested-repo-config.c b/t/helper/test-submodule-nested-repo-config.c
index bc97929..ecd40de 100644
--- a/t/helper/test-submodule-nested-repo-config.c
+++ b/t/helper/test-submodule-nested-repo-config.c
@@ -1,7 +1,9 @@
 #include "test-tool.h"
+#include "repository.h"
+#include "setup.h"
 #include "submodule-config.h"
 
-static void die_usage(int argc, const char **argv, const char *msg)
+static void die_usage(const char **argv, const char *msg)
 {
 	fprintf(stderr, "%s\n", msg);
 	fprintf(stderr, "Usage: %s <submodulepath> <config name>\n", argv[0]);
@@ -11,16 +13,14 @@ static void die_usage(int argc, const char **argv, const char *msg)
 int cmd__submodule_nested_repo_config(int argc, const char **argv)
 {
 	struct repository subrepo;
-	const struct submodule *sub;
 
 	if (argc < 3)
-		die_usage(argc, argv, "Wrong number of arguments.");
+		die_usage(argv, "Wrong number of arguments.");
 
 	setup_git_directory();
 
-	sub = submodule_from_path(the_repository, &null_oid, argv[1]);
-	if (repo_submodule_init(&subrepo, the_repository, sub)) {
-		die_usage(argc, argv, "Submodule not found.");
+	if (repo_submodule_init(&subrepo, the_repository, argv[1], null_oid())) {
+		die_usage(argv, "Submodule not found.");
 	}
 
 	/* Read the config of _child_ submodules. */
diff --git a/t/helper/test-submodule.c b/t/helper/test-submodule.c
new file mode 100644
index 0000000..7197969
--- /dev/null
+++ b/t/helper/test-submodule.c
@@ -0,0 +1,242 @@
+#include "test-tool.h"
+#include "test-tool-utils.h"
+#include "parse-options.h"
+#include "remote.h"
+#include "repository.h"
+#include "setup.h"
+#include "strbuf.h"
+#include "submodule-config.h"
+#include "submodule.h"
+
+#define TEST_TOOL_CHECK_NAME_USAGE \
+	"test-tool submodule check-name"
+static const char *submodule_check_name_usage[] = {
+	TEST_TOOL_CHECK_NAME_USAGE,
+	NULL
+};
+
+#define TEST_TOOL_CHECK_URL_USAGE \
+	"test-tool submodule check-url"
+static const char *submodule_check_url_usage[] = {
+	TEST_TOOL_CHECK_URL_USAGE,
+	NULL
+};
+
+#define TEST_TOOL_IS_ACTIVE_USAGE \
+	"test-tool submodule is-active <name>"
+static const char *submodule_is_active_usage[] = {
+	TEST_TOOL_IS_ACTIVE_USAGE,
+	NULL
+};
+
+#define TEST_TOOL_RESOLVE_RELATIVE_URL_USAGE \
+	"test-tool submodule resolve-relative-url <up_path> <remoteurl> <url>"
+static const char *submodule_resolve_relative_url_usage[] = {
+	TEST_TOOL_RESOLVE_RELATIVE_URL_USAGE,
+	NULL,
+};
+
+static const char *submodule_usage[] = {
+	TEST_TOOL_CHECK_NAME_USAGE,
+	TEST_TOOL_CHECK_URL_USAGE,
+	TEST_TOOL_IS_ACTIVE_USAGE,
+	TEST_TOOL_RESOLVE_RELATIVE_URL_USAGE,
+	NULL
+};
+
+typedef int (*check_fn_t)(const char *);
+
+/*
+ * Apply 'check_fn' to each line of stdin, printing values that pass the check
+ * to stdout.
+ */
+static int check_submodule(check_fn_t check_fn)
+{
+	struct strbuf buf = STRBUF_INIT;
+	while (strbuf_getline(&buf, stdin) != EOF) {
+		if (!check_fn(buf.buf))
+			printf("%s\n", buf.buf);
+	}
+	strbuf_release(&buf);
+	return 0;
+}
+
+static int cmd__submodule_check_name(int argc, const char **argv)
+{
+	struct option options[] = {
+		OPT_END()
+	};
+	argc = parse_options(argc, argv, "test-tools", options,
+			     submodule_check_name_usage, 0);
+	if (argc)
+		usage_with_options(submodule_check_name_usage, options);
+
+	return check_submodule(check_submodule_name);
+}
+
+static int cmd__submodule_check_url(int argc, const char **argv)
+{
+	struct option options[] = {
+		OPT_END()
+	};
+	argc = parse_options(argc, argv, "test-tools", options,
+			     submodule_check_url_usage, 0);
+	if (argc)
+		usage_with_options(submodule_check_url_usage, options);
+
+	return check_submodule(check_submodule_url);
+}
+
+static int cmd__submodule_is_active(int argc, const char **argv)
+{
+	struct option options[] = {
+		OPT_END()
+	};
+	argc = parse_options(argc, argv, "test-tools", options,
+			     submodule_is_active_usage, 0);
+	if (argc != 1)
+		usage_with_options(submodule_is_active_usage, options);
+
+	setup_git_directory();
+
+	return !is_submodule_active(the_repository, argv[0]);
+}
+
+static int cmd__submodule_resolve_relative_url(int argc, const char **argv)
+{
+	char *remoteurl, *res;
+	const char *up_path, *url;
+	struct option options[] = {
+		OPT_END()
+	};
+	argc = parse_options(argc, argv, "test-tools", options,
+			     submodule_resolve_relative_url_usage, 0);
+	if (argc != 3)
+		usage_with_options(submodule_resolve_relative_url_usage, options);
+
+	up_path = argv[0];
+	remoteurl = xstrdup(argv[1]);
+	url = argv[2];
+
+	if (!strcmp(up_path, "(null)"))
+		up_path = NULL;
+
+	res = relative_url(remoteurl, url, up_path);
+	puts(res);
+	free(res);
+	free(remoteurl);
+	return 0;
+}
+
+static int cmd__submodule_config_list(int argc, const char **argv)
+{
+	struct option options[] = {
+		OPT_END()
+	};
+	const char *const usage[] = {
+		"test-tool submodule config-list <key>",
+		NULL
+	};
+	argc = parse_options(argc, argv, "test-tools", options, usage,
+			     PARSE_OPT_KEEP_ARGV0);
+
+	setup_git_directory();
+
+	if (argc == 2)
+		return print_config_from_gitmodules(the_repository, argv[1]);
+	usage_with_options(usage, options);
+}
+
+static int cmd__submodule_config_set(int argc, const char **argv)
+{
+	struct option options[] = {
+		OPT_END()
+	};
+	const char *const usage[] = {
+		"test-tool submodule config-set <key> <value>",
+		NULL
+	};
+	argc = parse_options(argc, argv, "test-tools", options, usage,
+			     PARSE_OPT_KEEP_ARGV0);
+
+	setup_git_directory();
+
+	/* Equivalent to ACTION_SET in builtin/config.c */
+	if (argc == 3) {
+		if (!is_writing_gitmodules_ok())
+			die("please make sure that the .gitmodules file is in the working tree");
+
+		return config_set_in_gitmodules_file_gently(argv[1], argv[2]);
+	}
+	usage_with_options(usage, options);
+}
+
+static int cmd__submodule_config_unset(int argc, const char **argv)
+{
+	struct option options[] = {
+		OPT_END()
+	};
+	const char *const usage[] = {
+		"test-tool submodule config-unset <key>",
+		NULL
+	};
+
+	setup_git_directory();
+
+	if (argc == 2) {
+		if (!is_writing_gitmodules_ok())
+			die("please make sure that the .gitmodules file is in the working tree");
+		return config_set_in_gitmodules_file_gently(argv[1], NULL);
+	}
+	usage_with_options(usage, options);
+}
+
+static int cmd__submodule_config_writeable(int argc, const char **argv UNUSED)
+{
+	struct option options[] = {
+		OPT_END()
+	};
+	const char *const usage[] = {
+		"test-tool submodule config-writeable",
+		NULL
+	};
+	setup_git_directory();
+
+	if (argc == 1)
+		return is_writing_gitmodules_ok() ? 0 : -1;
+
+	usage_with_options(usage, options);
+}
+
+static struct test_cmd cmds[] = {
+	{ "check-name", cmd__submodule_check_name },
+	{ "check-url", cmd__submodule_check_url },
+	{ "is-active", cmd__submodule_is_active },
+	{ "resolve-relative-url", cmd__submodule_resolve_relative_url},
+	{ "config-list", cmd__submodule_config_list },
+	{ "config-set", cmd__submodule_config_set },
+	{ "config-unset", cmd__submodule_config_unset },
+	{ "config-writeable", cmd__submodule_config_writeable },
+};
+
+int cmd__submodule(int argc, const char **argv)
+{
+	struct option options[] = {
+		OPT_END()
+	};
+	size_t i;
+
+	argc = parse_options(argc, argv, "test-tools", options, submodule_usage,
+			     PARSE_OPT_STOP_AT_NON_OPTION);
+	if (argc < 1)
+		usage_with_options(submodule_usage, options);
+
+	for (i = 0; i < ARRAY_SIZE(cmds); i++)
+		if (!strcmp(cmds[i].name, argv[0]))
+			return cmds[i].fn(argc, argv);
+
+	usage_msg_optf("unknown subcommand '%s'", submodule_usage, options,
+		       argv[0]);
+
+	return 0;
+}
diff --git a/t/helper/test-subprocess.c b/t/helper/test-subprocess.c
index 92b69de..c344f16 100644
--- a/t/helper/test-subprocess.c
+++ b/t/helper/test-subprocess.c
@@ -1,6 +1,6 @@
 #include "test-tool.h"
-#include "cache.h"
 #include "run-command.h"
+#include "setup.h"
 
 int cmd__subprocess(int argc, const char **argv)
 {
@@ -15,6 +15,6 @@ int cmd__subprocess(int argc, const char **argv)
 		argv++;
 	}
 	cp.git_cmd = 1;
-	cp.argv = (const char **)argv + 1;
+	strvec_pushv(&cp.args, (const char **)argv + 1);
 	return run_command(&cp);
 }
diff --git a/t/helper/test-svn-fe.c b/t/helper/test-svn-fe.c
deleted file mode 100644
index 7667c08..0000000
--- a/t/helper/test-svn-fe.c
+++ /dev/null
@@ -1,52 +0,0 @@
-/*
- * test-svn-fe: Code to exercise the svn import lib
- */
-
-#include "git-compat-util.h"
-#include "vcs-svn/svndump.h"
-#include "vcs-svn/svndiff.h"
-#include "vcs-svn/sliding_window.h"
-#include "vcs-svn/line_buffer.h"
-
-static const char test_svnfe_usage[] =
-	"test-svn-fe (<dumpfile> | [-d] <preimage> <delta> <len>)";
-
-static int apply_delta(int argc, const char **argv)
-{
-	struct line_buffer preimage = LINE_BUFFER_INIT;
-	struct line_buffer delta = LINE_BUFFER_INIT;
-	struct sliding_view preimage_view = SLIDING_VIEW_INIT(&preimage, -1);
-
-	if (argc != 5)
-		usage(test_svnfe_usage);
-
-	if (buffer_init(&preimage, argv[2]))
-		die_errno("cannot open preimage");
-	if (buffer_init(&delta, argv[3]))
-		die_errno("cannot open delta");
-	if (svndiff0_apply(&delta, (off_t) strtoumax(argv[4], NULL, 0),
-					&preimage_view, stdout))
-		return 1;
-	if (buffer_deinit(&preimage))
-		die_errno("cannot close preimage");
-	if (buffer_deinit(&delta))
-		die_errno("cannot close delta");
-	strbuf_release(&preimage_view.buf);
-	return 0;
-}
-
-int cmd_main(int argc, const char **argv)
-{
-	if (argc == 2) {
-		if (svndump_init(argv[1]))
-			return 1;
-		svndump_read(NULL, "refs/heads/master", "refs/notes/svn/revs");
-		svndump_deinit();
-		svndump_reset();
-		return 0;
-	}
-
-	if (argc >= 2 && !strcmp(argv[1], "-d"))
-		return apply_delta(argc, argv);
-	usage(test_svnfe_usage);
-}
diff --git a/t/helper/test-tool-utils.h b/t/helper/test-tool-utils.h
new file mode 100644
index 0000000..6a0e5e0
--- /dev/null
+++ b/t/helper/test-tool-utils.h
@@ -0,0 +1,9 @@
+#ifndef TEST_TOOL_UTILS_H
+#define TEST_TOOL_UTILS_H
+
+struct test_cmd {
+	const char *name;
+	int (*fn)(int argc, const char **argv);
+};
+
+#endif
diff --git a/t/helper/test-tool.c b/t/helper/test-tool.c
index 590b2ef..80a946b 100644
--- a/t/helper/test-tool.c
+++ b/t/helper/test-tool.c
@@ -1,5 +1,6 @@
 #include "git-compat-util.h"
 #include "test-tool.h"
+#include "test-tool-utils.h"
 #include "trace2.h"
 #include "parse-options.h"
 
@@ -8,18 +9,18 @@ static const char * const test_tool_usage[] = {
 	NULL
 };
 
-struct test_cmd {
-	const char *name;
-	int (*fn)(int argc, const char **argv);
-};
-
 static struct test_cmd cmds[] = {
 	{ "advise", cmd__advise_if_enabled },
+	{ "bitmap", cmd__bitmap },
 	{ "bloom", cmd__bloom },
+	{ "bundle-uri", cmd__bundle_uri },
+	{ "cache-tree", cmd__cache_tree },
 	{ "chmtime", cmd__chmtime },
 	{ "config", cmd__config },
-	{ "ctype", cmd__ctype },
+	{ "crontab", cmd__crontab },
+	{ "csprng", cmd__csprng },
 	{ "date", cmd__date },
+	{ "delete-gpgsig", cmd__delete_gpgsig },
 	{ "delta", cmd__delta },
 	{ "dir-iterator", cmd__dir_iterator },
 	{ "drop-caches", cmd__drop_caches },
@@ -27,12 +28,16 @@ static struct test_cmd cmds[] = {
 	{ "dump-fsmonitor", cmd__dump_fsmonitor },
 	{ "dump-split-index", cmd__dump_split_index },
 	{ "dump-untracked-cache", cmd__dump_untracked_cache },
+	{ "env-helper", cmd__env_helper },
 	{ "example-decorate", cmd__example_decorate },
+	{ "find-pack", cmd__find_pack },
+	{ "fsmonitor-client", cmd__fsmonitor_client },
 	{ "genrandom", cmd__genrandom },
 	{ "genzeros", cmd__genzeros },
+	{ "getcwd", cmd__getcwd },
 	{ "hashmap", cmd__hashmap },
 	{ "hash-speed", cmd__hash_speed },
-	{ "index-version", cmd__index_version },
+	{ "hexdump", cmd__hexdump },
 	{ "json-writer", cmd__json_writer },
 	{ "lazy-init-name-hash", cmd__lazy_init_name_hash },
 	{ "match-trees", cmd__match_trees },
@@ -40,18 +45,27 @@ static struct test_cmd cmds[] = {
 	{ "mktemp", cmd__mktemp },
 	{ "oid-array", cmd__oid_array },
 	{ "oidmap", cmd__oidmap },
+	{ "oidtree", cmd__oidtree },
 	{ "online-cpus", cmd__online_cpus },
+	{ "pack-mtimes", cmd__pack_mtimes },
 	{ "parse-options", cmd__parse_options },
+	{ "parse-options-flags", cmd__parse_options_flags },
 	{ "parse-pathspec-file", cmd__parse_pathspec_file },
+	{ "parse-subcommand", cmd__parse_subcommand },
+	{ "partial-clone", cmd__partial_clone },
 	{ "path-utils", cmd__path_utils },
+	{ "pcre2-config", cmd__pcre2_config },
 	{ "pkt-line", cmd__pkt_line },
-	{ "prio-queue", cmd__prio_queue },
+	{ "proc-receive", cmd__proc_receive },
 	{ "progress", cmd__progress },
 	{ "reach", cmd__reach },
 	{ "read-cache", cmd__read_cache },
 	{ "read-graph", cmd__read_graph },
 	{ "read-midx", cmd__read_midx },
 	{ "ref-store", cmd__ref_store },
+	{ "reftable", cmd__reftable },
+	{ "rot13-filter", cmd__rot13_filter },
+	{ "dump-reftable", cmd__dump_reftable },
 	{ "regex", cmd__regex },
 	{ "repository", cmd__repository },
 	{ "revision-walking", cmd__revision_walking },
@@ -59,14 +73,19 @@ static struct test_cmd cmds[] = {
 	{ "scrap-cache-tree", cmd__scrap_cache_tree },
 	{ "serve-v2", cmd__serve_v2 },
 	{ "sha1", cmd__sha1 },
+	{ "sha1-is-sha1dc", cmd__sha1_is_sha1dc },
 	{ "sha256", cmd__sha256 },
 	{ "sigchain", cmd__sigchain },
+	{ "simple-ipc", cmd__simple_ipc },
 	{ "strcmp-offset", cmd__strcmp_offset },
 	{ "string-list", cmd__string_list },
+	{ "submodule", cmd__submodule },
 	{ "submodule-config", cmd__submodule_config },
 	{ "submodule-nested-repo-config", cmd__submodule_nested_repo_config },
 	{ "subprocess", cmd__subprocess },
 	{ "trace2", cmd__trace2 },
+	{ "truncate", cmd__truncate },
+	{ "userdiff", cmd__userdiff },
 	{ "urlmatch-normalization", cmd__urlmatch_normalization },
 	{ "xml-encode", cmd__xml_encode },
 	{ "wildmatch", cmd__wildmatch },
diff --git a/t/helper/test-tool.h b/t/helper/test-tool.h
index ddc8e99..2808b92 100644
--- a/t/helper/test-tool.h
+++ b/t/helper/test-tool.h
@@ -1,46 +1,63 @@
 #ifndef TEST_TOOL_H
 #define TEST_TOOL_H
 
-#define USE_THE_INDEX_COMPATIBILITY_MACROS
 #include "git-compat-util.h"
 
 int cmd__advise_if_enabled(int argc, const char **argv);
+int cmd__bitmap(int argc, const char **argv);
 int cmd__bloom(int argc, const char **argv);
+int cmd__bundle_uri(int argc, const char **argv);
+int cmd__cache_tree(int argc, const char **argv);
 int cmd__chmtime(int argc, const char **argv);
 int cmd__config(int argc, const char **argv);
-int cmd__ctype(int argc, const char **argv);
+int cmd__crontab(int argc, const char **argv);
+int cmd__csprng(int argc, const char **argv);
 int cmd__date(int argc, const char **argv);
 int cmd__delta(int argc, const char **argv);
+int cmd__delete_gpgsig(int argc, const char **argv);
 int cmd__dir_iterator(int argc, const char **argv);
 int cmd__drop_caches(int argc, const char **argv);
 int cmd__dump_cache_tree(int argc, const char **argv);
 int cmd__dump_fsmonitor(int argc, const char **argv);
 int cmd__dump_split_index(int argc, const char **argv);
 int cmd__dump_untracked_cache(int argc, const char **argv);
+int cmd__dump_reftable(int argc, const char **argv);
+int cmd__env_helper(int argc, const char **argv);
 int cmd__example_decorate(int argc, const char **argv);
+int cmd__find_pack(int argc, const char **argv);
+int cmd__fsmonitor_client(int argc, const char **argv);
 int cmd__genrandom(int argc, const char **argv);
 int cmd__genzeros(int argc, const char **argv);
+int cmd__getcwd(int argc, const char **argv);
 int cmd__hashmap(int argc, const char **argv);
 int cmd__hash_speed(int argc, const char **argv);
-int cmd__index_version(int argc, const char **argv);
+int cmd__hexdump(int argc, const char **argv);
 int cmd__json_writer(int argc, const char **argv);
 int cmd__lazy_init_name_hash(int argc, const char **argv);
 int cmd__match_trees(int argc, const char **argv);
 int cmd__mergesort(int argc, const char **argv);
 int cmd__mktemp(int argc, const char **argv);
 int cmd__oidmap(int argc, const char **argv);
+int cmd__oidtree(int argc, const char **argv);
 int cmd__online_cpus(int argc, const char **argv);
+int cmd__pack_mtimes(int argc, const char **argv);
 int cmd__parse_options(int argc, const char **argv);
+int cmd__parse_options_flags(int argc, const char **argv);
 int cmd__parse_pathspec_file(int argc, const char** argv);
+int cmd__parse_subcommand(int argc, const char **argv);
+int cmd__partial_clone(int argc, const char **argv);
 int cmd__path_utils(int argc, const char **argv);
+int cmd__pcre2_config(int argc, const char **argv);
 int cmd__pkt_line(int argc, const char **argv);
-int cmd__prio_queue(int argc, const char **argv);
+int cmd__proc_receive(int argc, const char **argv);
 int cmd__progress(int argc, const char **argv);
 int cmd__reach(int argc, const char **argv);
 int cmd__read_cache(int argc, const char **argv);
 int cmd__read_graph(int argc, const char **argv);
 int cmd__read_midx(int argc, const char **argv);
 int cmd__ref_store(int argc, const char **argv);
+int cmd__rot13_filter(int argc, const char **argv);
+int cmd__reftable(int argc, const char **argv);
 int cmd__regex(int argc, const char **argv);
 int cmd__repository(int argc, const char **argv);
 int cmd__revision_walking(int argc, const char **argv);
@@ -48,15 +65,20 @@ int cmd__run_command(int argc, const char **argv);
 int cmd__scrap_cache_tree(int argc, const char **argv);
 int cmd__serve_v2(int argc, const char **argv);
 int cmd__sha1(int argc, const char **argv);
+int cmd__sha1_is_sha1dc(int argc, const char **argv);
 int cmd__oid_array(int argc, const char **argv);
 int cmd__sha256(int argc, const char **argv);
 int cmd__sigchain(int argc, const char **argv);
+int cmd__simple_ipc(int argc, const char **argv);
 int cmd__strcmp_offset(int argc, const char **argv);
 int cmd__string_list(int argc, const char **argv);
+int cmd__submodule(int argc, const char **argv);
 int cmd__submodule_config(int argc, const char **argv);
 int cmd__submodule_nested_repo_config(int argc, const char **argv);
 int cmd__subprocess(int argc, const char **argv);
 int cmd__trace2(int argc, const char **argv);
+int cmd__truncate(int argc, const char **argv);
+int cmd__userdiff(int argc, const char **argv);
 int cmd__urlmatch_normalization(int argc, const char **argv);
 int cmd__xml_encode(int argc, const char **argv);
 int cmd__wildmatch(int argc, const char **argv);
diff --git a/t/helper/test-trace2.c b/t/helper/test-trace2.c
index 823f33c..1adac29 100644
--- a/t/helper/test-trace2.c
+++ b/t/helper/test-trace2.c
@@ -1,9 +1,10 @@
 #include "test-tool.h"
-#include "cache.h"
 #include "strvec.h"
 #include "run-command.h"
 #include "exec-cmd.h"
 #include "config.h"
+#include "repository.h"
+#include "trace2.h"
 
 typedef int(fn_unit_test)(int argc, const char **argv);
 
@@ -44,7 +45,7 @@ static int get_i(int *p_value, const char *data)
  * [] "def_param" events for all of the "interesting" pre-defined
  * config settings.
  */
-static int ut_001return(int argc, const char **argv)
+static int ut_001return(int argc UNUSED, const char **argv)
 {
 	int rc;
 
@@ -64,7 +65,7 @@ static int ut_001return(int argc, const char **argv)
  * [] "def_param" events for all of the "interesting" pre-defined
  * config settings.
  */
-static int ut_002exit(int argc, const char **argv)
+static int ut_002exit(int argc UNUSED, const char **argv)
 {
 	int rc;
 
@@ -132,6 +133,7 @@ static int ut_003error(int argc, const char **argv)
  */
 static int ut_004child(int argc, const char **argv)
 {
+	struct child_process cmd = CHILD_PROCESS_INIT;
 	int result;
 
 	/*
@@ -141,7 +143,8 @@ static int ut_004child(int argc, const char **argv)
 	if (!argc)
 		return 0;
 
-	result = run_command_v_opt(argv, 0);
+	strvec_pushv(&cmd.args, argv);
+	result = run_command(&cmd);
 	exit(result);
 }
 
@@ -198,6 +201,267 @@ static int ut_006data(int argc, const char **argv)
 	return 0;
 }
 
+static int ut_007BUG(int argc UNUSED, const char **argv UNUSED)
+{
+	/*
+	 * Exercise BUG() to ensure that the message is printed to trace2.
+	 */
+	BUG("the bug message");
+}
+
+static int ut_008bug(int argc UNUSED, const char **argv UNUSED)
+{
+	bug("a bug message");
+	bug("another bug message");
+	BUG_if_bug("an explicit BUG_if_bug() following bug() call(s) is nice, but not required");
+	return 0;
+}
+
+static int ut_009bug_BUG(int argc UNUSED, const char **argv UNUSED)
+{
+	bug("a bug message");
+	bug("another bug message");
+	/* The BUG_if_bug(...) isn't here, but we'll spot bug() calls on exit()! */
+	return 0;
+}
+
+static int ut_010bug_BUG(int argc UNUSED, const char **argv UNUSED)
+{
+	bug("a %s message", "bug");
+	BUG("a %s message", "BUG");
+}
+
+/*
+ * Single-threaded timer test.  Create several intervals using the
+ * TEST1 timer.  The test script can verify that an aggregate Trace2
+ * "timer" event is emitted indicating that we started+stopped the
+ * timer the requested number of times.
+ */
+static int ut_100timer(int argc, const char **argv)
+{
+	const char *usage_error =
+		"expect <count> <ms_delay>";
+
+	int count = 0;
+	int delay = 0;
+	int k;
+
+	if (argc != 2)
+		die("%s", usage_error);
+	if (get_i(&count, argv[0]))
+		die("%s", usage_error);
+	if (get_i(&delay, argv[1]))
+		die("%s", usage_error);
+
+	for (k = 0; k < count; k++) {
+		trace2_timer_start(TRACE2_TIMER_ID_TEST1);
+		sleep_millisec(delay);
+		trace2_timer_stop(TRACE2_TIMER_ID_TEST1);
+	}
+
+	return 0;
+}
+
+struct ut_101_data {
+	int count;
+	int delay;
+};
+
+static void *ut_101timer_thread_proc(void *_ut_101_data)
+{
+	struct ut_101_data *data = _ut_101_data;
+	int k;
+
+	trace2_thread_start("ut_101");
+
+	for (k = 0; k < data->count; k++) {
+		trace2_timer_start(TRACE2_TIMER_ID_TEST2);
+		sleep_millisec(data->delay);
+		trace2_timer_stop(TRACE2_TIMER_ID_TEST2);
+	}
+
+	trace2_thread_exit();
+	return NULL;
+}
+
+/*
+ * Multi-threaded timer test.  Create several threads that each create
+ * several intervals using the TEST2 timer.  The test script can verify
+ * that an individual Trace2 "th_timer" events for each thread and an
+ * aggregate "timer" event are generated.
+ */
+static int ut_101timer(int argc, const char **argv)
+{
+	const char *usage_error =
+		"expect <count> <ms_delay> <threads>";
+
+	struct ut_101_data data = { 0, 0 };
+	int nr_threads = 0;
+	int k;
+	pthread_t *pids = NULL;
+
+	if (argc != 3)
+		die("%s", usage_error);
+	if (get_i(&data.count, argv[0]))
+		die("%s", usage_error);
+	if (get_i(&data.delay, argv[1]))
+		die("%s", usage_error);
+	if (get_i(&nr_threads, argv[2]))
+		die("%s", usage_error);
+
+	CALLOC_ARRAY(pids, nr_threads);
+
+	for (k = 0; k < nr_threads; k++) {
+		if (pthread_create(&pids[k], NULL, ut_101timer_thread_proc, &data))
+			die("failed to create thread[%d]", k);
+	}
+
+	for (k = 0; k < nr_threads; k++) {
+		if (pthread_join(pids[k], NULL))
+			die("failed to join thread[%d]", k);
+	}
+
+	free(pids);
+
+	return 0;
+}
+
+/*
+ * Single-threaded counter test.  Add several values to the TEST1 counter.
+ * The test script can verify that the final sum is reported in the "counter"
+ * event.
+ */
+static int ut_200counter(int argc, const char **argv)
+{
+	const char *usage_error =
+		"expect <v1> [<v2> [...]]";
+	int value;
+	int k;
+
+	if (argc < 1)
+		die("%s", usage_error);
+
+	for (k = 0; k < argc; k++) {
+		if (get_i(&value, argv[k]))
+			die("invalid value[%s] -- %s",
+			    argv[k], usage_error);
+		trace2_counter_add(TRACE2_COUNTER_ID_TEST1, value);
+	}
+
+	return 0;
+}
+
+/*
+ * Multi-threaded counter test.  Create seveal threads that each increment
+ * the TEST2 global counter.  The test script can verify that an individual
+ * "th_counter" event is generated with a partial sum for each thread and
+ * that a final aggregate "counter" event is generated.
+ */
+
+struct ut_201_data {
+	int v1;
+	int v2;
+};
+
+static void *ut_201counter_thread_proc(void *_ut_201_data)
+{
+	struct ut_201_data *data = _ut_201_data;
+
+	trace2_thread_start("ut_201");
+
+	trace2_counter_add(TRACE2_COUNTER_ID_TEST2, data->v1);
+	trace2_counter_add(TRACE2_COUNTER_ID_TEST2, data->v2);
+
+	trace2_thread_exit();
+	return NULL;
+}
+
+static int ut_201counter(int argc, const char **argv)
+{
+	const char *usage_error =
+		"expect <v1> <v2> <threads>";
+
+	struct ut_201_data data = { 0, 0 };
+	int nr_threads = 0;
+	int k;
+	pthread_t *pids = NULL;
+
+	if (argc != 3)
+		die("%s", usage_error);
+	if (get_i(&data.v1, argv[0]))
+		die("%s", usage_error);
+	if (get_i(&data.v2, argv[1]))
+		die("%s", usage_error);
+	if (get_i(&nr_threads, argv[2]))
+		die("%s", usage_error);
+
+	CALLOC_ARRAY(pids, nr_threads);
+
+	for (k = 0; k < nr_threads; k++) {
+		if (pthread_create(&pids[k], NULL, ut_201counter_thread_proc, &data))
+			die("failed to create thread[%d]", k);
+	}
+
+	for (k = 0; k < nr_threads; k++) {
+		if (pthread_join(pids[k], NULL))
+			die("failed to join thread[%d]", k);
+	}
+
+	free(pids);
+
+	return 0;
+}
+
+static int ut_300redact_start(int argc, const char **argv)
+{
+	if (!argc)
+		die("expect <argv...>");
+
+	trace2_cmd_start(argv);
+
+	return 0;
+}
+
+static int ut_301redact_child_start(int argc, const char **argv)
+{
+	struct child_process cmd = CHILD_PROCESS_INIT;
+	int k;
+
+	if (!argc)
+		die("expect <argv...>");
+
+	for (k = 0; argv[k]; k++)
+		strvec_push(&cmd.args, argv[k]);
+
+	trace2_child_start(&cmd);
+
+	strvec_clear(&cmd.args);
+
+	return 0;
+}
+
+static int ut_302redact_exec(int argc, const char **argv)
+{
+	if (!argc)
+		die("expect <exe> <argv...>");
+
+	trace2_exec(argv[0], &argv[1]);
+
+	return 0;
+}
+
+static int ut_303redact_def_param(int argc, const char **argv)
+{
+	struct key_value_info kvi = KVI_INIT;
+
+	if (argc < 2)
+		die("expect <key> <value>");
+
+	trace2_def_param(argv[0], argv[1], &kvi);
+
+	return 0;
+}
+
 /*
  * Usage:
  *     test-tool trace2 <ut_name_1> <ut_usage_1>
@@ -214,6 +478,21 @@ static struct unit_test ut_table[] = {
 	{ ut_004child,    "004child",  "[<child_command_line>]" },
 	{ ut_005exec,     "005exec",   "<git_command_args>" },
 	{ ut_006data,     "006data",   "[<category> <key> <value>]+" },
+	{ ut_007BUG,      "007bug",    "" },
+	{ ut_008bug,      "008bug",    "" },
+	{ ut_009bug_BUG,  "009bug_BUG","" },
+	{ ut_010bug_BUG,  "010bug_BUG","" },
+
+	{ ut_100timer,    "100timer",  "<count> <ms_delay>" },
+	{ ut_101timer,    "101timer",  "<count> <ms_delay> <threads>" },
+
+	{ ut_200counter,  "200counter", "<v1> [<v2> [<v3> [...]]]" },
+	{ ut_201counter,  "201counter", "<v1> <v2> <threads>" },
+
+	{ ut_300redact_start,       "300redact_start",       "<argv...>" },
+	{ ut_301redact_child_start, "301redact_child_start", "<argv...>" },
+	{ ut_302redact_exec,        "302redact_exec",        "<exe> <argv...>" },
+	{ ut_303redact_def_param,   "303redact_def_param",   "<key> <value>" },
 };
 /* clang-format on */
 
@@ -253,8 +532,9 @@ static int print_usage(void)
  *    [] the "cmd_name" event has been generated.
  *    [] this writes various "def_param" events for interesting config values.
  *
- * We further assume that if we return (rather than exit()), trace2_cmd_exit()
- * will be called by test-tool.c:cmd_main().
+ * We return from here and let test-tool.c::cmd_main() pass the exit
+ * code to common-main.c::main(), which will use it to call
+ * trace2_cmd_exit().
  */
 int cmd__trace2(int argc, const char **argv)
 {
diff --git a/t/helper/test-truncate.c b/t/helper/test-truncate.c
new file mode 100644
index 0000000..3931dea
--- /dev/null
+++ b/t/helper/test-truncate.c
@@ -0,0 +1,25 @@
+#include "test-tool.h"
+#include "git-compat-util.h"
+
+/*
+ * Truncate a file to the given size.
+ */
+int cmd__truncate(int argc, const char **argv)
+{
+	char *p = NULL;
+	uintmax_t sz = 0;
+	int fd = -1;
+
+	if (argc != 3)
+		die("expected filename and size");
+
+	sz = strtoumax(argv[2], &p, 0);
+	if (*p)
+		die("invalid size");
+
+	fd = xopen(argv[1], O_WRONLY | O_CREAT, 0600);
+
+	if (ftruncate(fd, (off_t) sz) < 0)
+		die_errno("failed to truncate file");
+	return 0;
+}
diff --git a/t/helper/test-urlmatch-normalization.c b/t/helper/test-urlmatch-normalization.c
index 8f4d67e..86edd45 100644
--- a/t/helper/test-urlmatch-normalization.c
+++ b/t/helper/test-urlmatch-normalization.c
@@ -5,8 +5,9 @@
 int cmd__urlmatch_normalization(int argc, const char **argv)
 {
 	const char usage[] = "test-tool urlmatch-normalization [-p | -l] <url1> | <url1> <url2>";
-	char *url1, *url2;
+	char *url1 = NULL, *url2 = NULL;
 	int opt_p = 0, opt_l = 0;
+	int ret = 0;
 
 	/*
 	 * For one url, succeed if url_normalize succeeds on it, fail otherwise.
@@ -39,7 +40,7 @@ int cmd__urlmatch_normalization(int argc, const char **argv)
 			printf("%s\n", url1);
 		if (opt_l)
 			printf("%u\n", (unsigned)info.url_len);
-		return 0;
+		goto cleanup;
 	}
 
 	if (opt_p || opt_l)
@@ -47,5 +48,9 @@ int cmd__urlmatch_normalization(int argc, const char **argv)
 
 	url1 = url_normalize(argv[1], NULL);
 	url2 = url_normalize(argv[2], NULL);
-	return (url1 && url2 && !strcmp(url1, url2)) ? 0 : 1;
+	ret = (url1 && url2 && !strcmp(url1, url2)) ? 0 : 1;
+cleanup:
+	free(url1);
+	free(url2);
+	return ret;
 }
diff --git a/t/helper/test-userdiff.c b/t/helper/test-userdiff.c
new file mode 100644
index 0000000..0ce31ce
--- /dev/null
+++ b/t/helper/test-userdiff.c
@@ -0,0 +1,48 @@
+#include "test-tool.h"
+#include "setup.h"
+#include "userdiff.h"
+#include "config.h"
+
+static int driver_cb(struct userdiff_driver *driver,
+		     enum userdiff_driver_type type, void *priv)
+{
+	enum userdiff_driver_type *want_type = priv;
+	if (type & *want_type && driver->funcname.pattern)
+		puts(driver->name);
+	return 0;
+}
+
+static int cmd__userdiff_config(const char *var, const char *value,
+				const struct config_context *ctx UNUSED,
+				void *cb UNUSED)
+{
+	if (userdiff_config(var, value) < 0)
+		return -1;
+	return 0;
+}
+
+int cmd__userdiff(int argc, const char **argv)
+{
+	enum userdiff_driver_type want = 0;
+	if (argc != 2)
+		return 1;
+
+	if (!strcmp(argv[1], "list-drivers"))
+		want = (USERDIFF_DRIVER_TYPE_BUILTIN |
+			USERDIFF_DRIVER_TYPE_CUSTOM);
+	else if (!strcmp(argv[1], "list-builtin-drivers"))
+		want = USERDIFF_DRIVER_TYPE_BUILTIN;
+	else if (!strcmp(argv[1], "list-custom-drivers"))
+		want = USERDIFF_DRIVER_TYPE_CUSTOM;
+	else
+		return error("unknown argument %s", argv[1]);
+
+	if (want & USERDIFF_DRIVER_TYPE_CUSTOM) {
+		setup_git_directory();
+		git_config(cmd__userdiff_config, NULL);
+	}
+
+	for_each_userdiff_driver(driver_cb, &want);
+
+	return 0;
+}
diff --git a/t/helper/test-wildmatch.c b/t/helper/test-wildmatch.c
index 2c103d1..b4ff5f9 100644
--- a/t/helper/test-wildmatch.c
+++ b/t/helper/test-wildmatch.c
@@ -1,5 +1,5 @@
 #include "test-tool.h"
-#include "cache.h"
+#include "wildmatch.h"
 
 int cmd__wildmatch(int argc, const char **argv)
 {
diff --git a/t/helper/test-write-cache.c b/t/helper/test-write-cache.c
index 8837717..f084034 100644
--- a/t/helper/test-write-cache.c
+++ b/t/helper/test-write-cache.c
@@ -1,6 +1,9 @@
+#define USE_THE_INDEX_VARIABLE
 #include "test-tool.h"
-#include "cache.h"
 #include "lockfile.h"
+#include "read-cache-ll.h"
+#include "repository.h"
+#include "setup.h"
 
 int cmd__write_cache(int argc, const char **argv)
 {
@@ -9,9 +12,10 @@ int cmd__write_cache(int argc, const char **argv)
 	if (argc == 2)
 		cnt = strtol(argv[1], NULL, 0);
 	setup_git_directory();
-	read_cache();
+	repo_read_index(the_repository);
 	for (i = 0; i < cnt; i++) {
-		hold_locked_index(&index_lock, LOCK_DIE_ON_ERROR);
+		repo_hold_locked_index(the_repository, &index_lock,
+				       LOCK_DIE_ON_ERROR);
 		if (write_locked_index(&the_index, &index_lock, COMMIT_LOCK))
 			die("unable to write index file");
 	}
diff --git a/t/helper/test-xml-encode.c b/t/helper/test-xml-encode.c
index a648bbd..b2f330d 100644
--- a/t/helper/test-xml-encode.c
+++ b/t/helper/test-xml-encode.c
@@ -6,7 +6,7 @@ static const char *utf8_replace_character = "&#xfffd;";
  * Encodes (possibly incorrect) UTF-8 on <stdin> to <stdout>, to be embedded
  * in an XML file.
  */
-int cmd__xml_encode(int argc, const char **argv)
+int cmd__xml_encode(int argc UNUSED, const char **argv UNUSED)
 {
 	unsigned char buf[1024], tmp[4], *tmp2 = NULL;
 	ssize_t cur = 0, len = 1, remaining = 0;
diff --git a/t/interop/Makefile b/t/interop/Makefile
index 31a4bbc..6911c29 100644
--- a/t/interop/Makefile
+++ b/t/interop/Makefile
@@ -1,3 +1,6 @@
+# Import tree-wide shared Makefile behavior and libraries
+include ../../shared.mak
+
 -include ../../config.mak
 export GIT_TEST_OPTIONS
 
diff --git a/t/interop/interop-lib.sh b/t/interop/interop-lib.sh
index 3e0a291..62f4481 100644
--- a/t/interop/interop-lib.sh
+++ b/t/interop/interop-lib.sh
@@ -68,7 +68,7 @@ generate_wrappers () {
 	wrap_git .bin/git.a "$DIR_A" &&
 	wrap_git .bin/git.b "$DIR_B" &&
 	write_script .bin/git <<-\EOF &&
-	echo >&2 fatal: test tried to run generic git
+	echo >&2 fatal: test tried to run generic git: $*
 	exit 1
 	EOF
 	PATH=$(pwd)/.bin:$PATH
diff --git a/t/lib-bitmap.sh b/t/lib-bitmap.sh
new file mode 100644
index 0000000..f595937
--- /dev/null
+++ b/t/lib-bitmap.sh
@@ -0,0 +1,451 @@
+# Helpers for scripts testing bitmap functionality; see t5310 for
+# example usage.
+
+objdir=.git/objects
+midx=$objdir/pack/multi-pack-index
+
+# Compare a file containing rev-list bitmap traversal output to its non-bitmap
+# counterpart. You can't just use test_cmp for this, because the two produce
+# subtly different output:
+#
+#   - regular output is in traversal order, whereas bitmap is split by type,
+#     with non-packed objects at the end
+#
+#   - regular output has a space and the pathname appended to non-commit
+#     objects; bitmap output omits this
+#
+# This function normalizes and compares the two. The second file should
+# always be the bitmap output.
+test_bitmap_traversal () {
+	if test "$1" = "--no-confirm-bitmaps"
+	then
+		shift
+	elif cmp "$1" "$2"
+	then
+		echo >&2 "identical raw outputs; are you sure bitmaps were used?"
+		return 1
+	fi &&
+	cut -d' ' -f1 "$1" | sort >"$1.normalized" &&
+	sort "$2" >"$2.normalized" &&
+	test_cmp "$1.normalized" "$2.normalized" &&
+	rm -f "$1.normalized" "$2.normalized"
+}
+
+# To ensure the logic for "maximal commits" is exercised, make
+# the repository a bit more complicated.
+#
+#    other                         second
+#      *                             *
+# (99 commits)                  (99 commits)
+#      *                             *
+#      |\                           /|
+#      | * octo-other  octo-second * |
+#      |/|\_________  ____________/|\|
+#      | \          \/  __________/  |
+#      |  | ________/\ /             |
+#      *  |/          * merge-right  *
+#      | _|__________/ \____________ |
+#      |/ |                         \|
+# (l1) *  * merge-left               * (r1)
+#      | / \________________________ |
+#      |/                           \|
+# (l2) *                             * (r2)
+#       \___________________________ |
+#                                   \|
+#                                    * (base)
+#
+# We only push bits down the first-parent history, which
+# makes some of these commits unimportant!
+#
+# The important part for the maximal commit algorithm is how
+# the bitmasks are extended. Assuming starting bit positions
+# for second (bit 0) and other (bit 1), the bitmasks at the
+# end should be:
+#
+#      second: 1       (maximal, selected)
+#       other: 01      (maximal, selected)
+#      (base): 11 (maximal)
+#
+# This complicated history was important for a previous
+# version of the walk that guarantees never walking a
+# commit multiple times. That goal might be important
+# again, so preserve this complicated case. For now, this
+# test will guarantee that the bitmaps are computed
+# correctly, even with the repeat calculations.
+setup_bitmap_history() {
+	test_expect_success 'setup repo with moderate-sized history' '
+		test_commit_bulk --id=file 10 &&
+		git branch -M second &&
+		git checkout -b other HEAD~5 &&
+		test_commit_bulk --id=side 10 &&
+
+		# add complicated history setup, including merges and
+		# ambiguous merge-bases
+
+		git checkout -b merge-left other~2 &&
+		git merge second~2 -m "merge-left" &&
+
+		git checkout -b merge-right second~1 &&
+		git merge other~1 -m "merge-right" &&
+
+		git checkout -b octo-second second &&
+		git merge merge-left merge-right -m "octopus-second" &&
+
+		git checkout -b octo-other other &&
+		git merge merge-left merge-right -m "octopus-other" &&
+
+		git checkout other &&
+		git merge octo-other -m "pull octopus" &&
+
+		git checkout second &&
+		git merge octo-second -m "pull octopus" &&
+
+		# Remove these branches so they are not selected
+		# as bitmap tips
+		git branch -D merge-left &&
+		git branch -D merge-right &&
+		git branch -D octo-other &&
+		git branch -D octo-second &&
+
+		# add padding to make these merges less interesting
+		# and avoid having them selected for bitmaps
+		test_commit_bulk --id=file 100 &&
+		git checkout other &&
+		test_commit_bulk --id=side 100 &&
+		git checkout second &&
+
+		bitmaptip=$(git rev-parse second) &&
+		blob=$(echo tagged-blob | git hash-object -w --stdin) &&
+		git tag tagged-blob $blob
+	'
+}
+
+rev_list_tests_head () {
+	test_expect_success "counting commits via bitmap ($state, $branch)" '
+		git rev-list --count $branch >expect &&
+		git rev-list --use-bitmap-index --count $branch >actual &&
+		test_cmp expect actual
+	'
+
+	test_expect_success "counting partial commits via bitmap ($state, $branch)" '
+		git rev-list --count $branch~5..$branch >expect &&
+		git rev-list --use-bitmap-index --count $branch~5..$branch >actual &&
+		test_cmp expect actual
+	'
+
+	test_expect_success "counting commits with limit ($state, $branch)" '
+		git rev-list --count -n 1 $branch >expect &&
+		git rev-list --use-bitmap-index --count -n 1 $branch >actual &&
+		test_cmp expect actual
+	'
+
+	test_expect_success "counting non-linear history ($state, $branch)" '
+		git rev-list --count other...second >expect &&
+		git rev-list --use-bitmap-index --count other...second >actual &&
+		test_cmp expect actual
+	'
+
+	test_expect_success "counting commits with limiting ($state, $branch)" '
+		git rev-list --count $branch -- 1.t >expect &&
+		git rev-list --use-bitmap-index --count $branch -- 1.t >actual &&
+		test_cmp expect actual
+	'
+
+	test_expect_success "counting objects via bitmap ($state, $branch)" '
+		git rev-list --count --objects $branch >expect &&
+		git rev-list --use-bitmap-index --count --objects $branch >actual &&
+		test_cmp expect actual
+	'
+
+	test_expect_success "enumerate commits ($state, $branch)" '
+		git rev-list --use-bitmap-index $branch >actual &&
+		git rev-list $branch >expect &&
+		test_bitmap_traversal --no-confirm-bitmaps expect actual
+	'
+
+	test_expect_success "enumerate --objects ($state, $branch)" '
+		git rev-list --objects --use-bitmap-index $branch >actual &&
+		git rev-list --objects $branch >expect &&
+		test_bitmap_traversal expect actual
+	'
+
+	test_expect_success "bitmap --objects handles non-commit objects ($state, $branch)" '
+		git rev-list --objects --use-bitmap-index $branch tagged-blob >actual &&
+		grep $blob actual
+	'
+}
+
+rev_list_tests () {
+	state=$1
+
+	for branch in "second" "other"
+	do
+		rev_list_tests_head
+	done
+}
+
+basic_bitmap_tests () {
+	tip="$1"
+	test_expect_success 'rev-list --test-bitmap verifies bitmaps' "
+		git rev-list --test-bitmap "${tip:-HEAD}"
+	"
+
+	rev_list_tests 'full bitmap'
+
+	test_expect_success 'clone from bitmapped repository' '
+		rm -fr clone.git &&
+		git clone --no-local --bare . clone.git &&
+		git rev-parse HEAD >expect &&
+		git --git-dir=clone.git rev-parse HEAD >actual &&
+		test_cmp expect actual
+	'
+
+	test_expect_success 'partial clone from bitmapped repository' '
+		test_config uploadpack.allowfilter true &&
+		rm -fr partial-clone.git &&
+		git clone --no-local --bare --filter=blob:none . partial-clone.git &&
+		(
+			cd partial-clone.git &&
+			pack=$(echo objects/pack/*.pack) &&
+			git verify-pack -v "$pack" >have &&
+			awk "/blob/ { print \$1 }" <have >blobs &&
+			# we expect this single blob because of the direct ref
+			git rev-parse refs/tags/tagged-blob >expect &&
+			test_cmp expect blobs
+		)
+	'
+
+	test_expect_success 'setup further non-bitmapped commits' '
+		test_commit_bulk --id=further 10
+	'
+
+	rev_list_tests 'partial bitmap'
+
+	test_expect_success 'fetch (partial bitmap)' '
+		git --git-dir=clone.git fetch origin second:second &&
+		git rev-parse HEAD >expect &&
+		git --git-dir=clone.git rev-parse HEAD >actual &&
+		test_cmp expect actual
+	'
+
+	test_expect_success 'enumerating progress counts pack-reused objects' '
+		count=$(git rev-list --objects --all --count) &&
+		git repack -adb &&
+
+		# check first with only reused objects; confirm that our
+		# progress showed the right number, and also that we did
+		# pack-reuse as expected.  Check only the final "done"
+		# line of the meter (there may be an arbitrary number of
+		# intermediate lines ending with CR).
+		GIT_PROGRESS_DELAY=0 \
+			git pack-objects --all --stdout --progress \
+			</dev/null >/dev/null 2>stderr &&
+		grep "Enumerating objects: $count, done" stderr &&
+		grep "pack-reused $count" stderr &&
+
+		# now the same but with one non-reused object
+		git commit --allow-empty -m "an extra commit object" &&
+		GIT_PROGRESS_DELAY=0 \
+			git pack-objects --all --stdout --progress \
+			</dev/null >/dev/null 2>stderr &&
+		grep "Enumerating objects: $((count+1)), done" stderr &&
+		grep "pack-reused $count" stderr
+	'
+}
+
+# have_delta <obj> <expected_base>
+#
+# Note that because this relies on cat-file, it might find _any_ copy of an
+# object in the repository. The caller is responsible for making sure
+# there's only one (e.g., via "repack -ad", or having just fetched a copy).
+have_delta () {
+	echo $2 >expect &&
+	echo $1 | git cat-file --batch-check="%(deltabase)" >actual &&
+	test_cmp expect actual
+}
+
+midx_checksum () {
+	test-tool read-midx --checksum "$1"
+}
+
+# midx_pack_source <obj>
+midx_pack_source () {
+	test-tool read-midx --show-objects .git/objects | grep "^$1 " | cut -f2
+}
+
+test_rev_exists () {
+	commit="$1"
+	kind="$2"
+
+	test_expect_success "reverse index exists ($kind)" '
+		GIT_TRACE2_EVENT=$(pwd)/event.trace \
+			git rev-list --test-bitmap "$commit" &&
+
+		if test "rev" = "$kind"
+		then
+			test_path_is_file $midx-$(midx_checksum $objdir).rev
+		fi &&
+		grep "\"category\":\"load_midx_revindex\",\"key\":\"source\",\"value\":\"$kind\"" event.trace
+	'
+}
+
+midx_bitmap_core () {
+	rev_kind="${1:-midx}"
+
+	setup_bitmap_history
+
+	test_expect_success 'create single-pack midx with bitmaps' '
+		git repack -ad &&
+		git multi-pack-index write --bitmap &&
+		test_path_is_file $midx &&
+		test_path_is_file $midx-$(midx_checksum $objdir).bitmap
+	'
+
+	test_rev_exists HEAD "$rev_kind"
+
+	basic_bitmap_tests
+
+	test_expect_success 'create new additional packs' '
+		for i in $(test_seq 1 16)
+		do
+			test_commit "$i" &&
+			git repack -d || return 1
+		done &&
+
+		git checkout -b other2 HEAD~8 &&
+		for i in $(test_seq 1 8)
+		do
+			test_commit "side-$i" &&
+			git repack -d || return 1
+		done &&
+		git checkout second
+	'
+
+	test_expect_success 'create multi-pack midx with bitmaps' '
+		git multi-pack-index write --bitmap &&
+
+		ls $objdir/pack/pack-*.pack >packs &&
+		test_line_count = 25 packs &&
+
+		test_path_is_file $midx &&
+		test_path_is_file $midx-$(midx_checksum $objdir).bitmap
+	'
+
+	test_rev_exists HEAD "$rev_kind"
+
+	basic_bitmap_tests
+
+	test_expect_success '--no-bitmap is respected when bitmaps exist' '
+		git multi-pack-index write --bitmap &&
+
+		test_commit respect--no-bitmap &&
+		git repack -d &&
+
+		test_path_is_file $midx &&
+		test_path_is_file $midx-$(midx_checksum $objdir).bitmap &&
+
+		git multi-pack-index write --no-bitmap &&
+
+		test_path_is_file $midx &&
+		test_path_is_missing $midx-$(midx_checksum $objdir).bitmap &&
+		test_path_is_missing $midx-$(midx_checksum $objdir).rev
+	'
+
+	test_expect_success 'setup midx with base from later pack' '
+		# Write a and b so that "a" is a delta on top of base "b", since Git
+		# prefers to delete contents out of a base rather than add to a shorter
+		# object.
+		test_seq 1 128 >a &&
+		test_seq 1 130 >b &&
+
+		git add a b &&
+		git commit -m "initial commit" &&
+
+		a=$(git rev-parse HEAD:a) &&
+		b=$(git rev-parse HEAD:b) &&
+
+		# In the first pack, "a" is stored as a delta to "b".
+		p1=$(git pack-objects .git/objects/pack/pack <<-EOF
+		$a
+		$b
+		EOF
+		) &&
+
+		# In the second pack, "a" is missing, and "b" is not a delta nor base to
+		# any other object.
+		p2=$(git pack-objects .git/objects/pack/pack <<-EOF
+		$b
+		$(git rev-parse HEAD)
+		$(git rev-parse HEAD^{tree})
+		EOF
+		) &&
+
+		git prune-packed &&
+		# Use the second pack as the preferred source, so that "b" occurs
+		# earlier in the MIDX object order, rendering "a" unusable for pack
+		# reuse.
+		git multi-pack-index write --bitmap --preferred-pack=pack-$p2.idx &&
+
+		have_delta $a $b &&
+		test $(midx_pack_source $a) != $(midx_pack_source $b)
+	'
+
+	rev_list_tests 'full bitmap with backwards delta'
+
+	test_expect_success 'clone with bitmaps enabled' '
+		git clone --no-local --bare . clone-reverse-delta.git &&
+		test_when_finished "rm -fr clone-reverse-delta.git" &&
+
+		git rev-parse HEAD >expect &&
+		git --git-dir=clone-reverse-delta.git rev-parse HEAD >actual &&
+		test_cmp expect actual
+	'
+
+	test_expect_success 'changing the preferred pack does not corrupt bitmaps' '
+		rm -fr repo &&
+		git init repo &&
+		test_when_finished "rm -fr repo" &&
+		(
+			cd repo &&
+
+			test_commit A &&
+			test_commit B &&
+
+			git rev-list --objects --no-object-names HEAD^ >A.objects &&
+			git rev-list --objects --no-object-names HEAD^.. >B.objects &&
+
+			A=$(git pack-objects $objdir/pack/pack <A.objects) &&
+			B=$(git pack-objects $objdir/pack/pack <B.objects) &&
+
+			cat >indexes <<-EOF &&
+			pack-$A.idx
+			pack-$B.idx
+			EOF
+
+			git multi-pack-index write --bitmap --stdin-packs \
+				--preferred-pack=pack-$A.pack <indexes &&
+			git rev-list --test-bitmap A &&
+
+			git multi-pack-index write --bitmap --stdin-packs \
+				--preferred-pack=pack-$B.pack <indexes &&
+			git rev-list --test-bitmap A
+		)
+	'
+}
+
+midx_bitmap_partial_tests () {
+	rev_kind="${1:-midx}"
+
+	test_expect_success 'setup partial bitmaps' '
+		test_commit packed &&
+		git repack &&
+		test_commit loose &&
+		git multi-pack-index write --bitmap &&
+		test_path_is_file $midx &&
+		test_path_is_file $midx-$(midx_checksum $objdir).bitmap
+	'
+
+	test_rev_exists HEAD~ "$rev_kind"
+
+	basic_bitmap_tests HEAD~
+}
diff --git a/t/lib-bundle-uri-protocol.sh b/t/lib-bundle-uri-protocol.sh
new file mode 100644
index 0000000..a4a1af8
--- /dev/null
+++ b/t/lib-bundle-uri-protocol.sh
@@ -0,0 +1,216 @@
+# Set up and run tests of the 'bundle-uri' command in protocol v2
+#
+# The test that includes this script should set BUNDLE_URI_PROTOCOL
+# to one of "file", "git", or "http".
+
+BUNDLE_URI_TEST_PARENT=
+BUNDLE_URI_TEST_URI=
+BUNDLE_URI_TEST_BUNDLE_URI=
+case "$BUNDLE_URI_PROTOCOL" in
+file)
+	BUNDLE_URI_PARENT=file_parent
+	BUNDLE_URI_REPO_URI="file://$PWD/file_parent"
+	BUNDLE_URI_BUNDLE_URI="$BUNDLE_URI_REPO_URI/fake.bdl"
+	test_set_prereq BUNDLE_URI_FILE
+	;;
+git)
+	. "$TEST_DIRECTORY"/lib-git-daemon.sh
+	start_git_daemon --export-all --enable=receive-pack
+	BUNDLE_URI_PARENT="$GIT_DAEMON_DOCUMENT_ROOT_PATH/parent"
+	BUNDLE_URI_REPO_URI="$GIT_DAEMON_URL/parent"
+	BUNDLE_URI_BUNDLE_URI="https://example.com/fake.bdl"
+	test_set_prereq BUNDLE_URI_GIT
+	;;
+http)
+	. "$TEST_DIRECTORY"/lib-httpd.sh
+	start_httpd
+	BUNDLE_URI_PARENT="$HTTPD_DOCUMENT_ROOT_PATH/http_parent"
+	BUNDLE_URI_REPO_URI="$HTTPD_URL/smart/http_parent"
+	BUNDLE_URI_BUNDLE_URI="https://example.com/fake.bdl"
+	test_set_prereq BUNDLE_URI_HTTP
+	;;
+*)
+	BUG "Need to pass valid BUNDLE_URI_PROTOCOL (was \"$BUNDLE_URI_PROTOCOL\")"
+	;;
+esac
+
+test_expect_success "setup protocol v2 $BUNDLE_URI_PROTOCOL:// tests" '
+	git init "$BUNDLE_URI_PARENT" &&
+	test_commit -C "$BUNDLE_URI_PARENT" one &&
+	git -C "$BUNDLE_URI_PARENT" config uploadpack.advertiseBundleURIs true
+'
+
+case "$BUNDLE_URI_PROTOCOL" in
+http)
+	test_expect_success "setup config for $BUNDLE_URI_PROTOCOL:// tests" '
+		git -C "$BUNDLE_URI_PARENT" config http.receivepack true
+	'
+	;;
+*)
+	;;
+esac
+BUNDLE_URI_BUNDLE_URI_ESCAPED=$(echo "$BUNDLE_URI_BUNDLE_URI" | test_uri_escape)
+
+test_expect_success "connect with $BUNDLE_URI_PROTOCOL:// using protocol v2: no bundle-uri" '
+	test_when_finished "rm -f log" &&
+	test_when_finished "git -C \"$BUNDLE_URI_PARENT\" config uploadpack.advertiseBundleURIs true" &&
+	git -C "$BUNDLE_URI_PARENT" config uploadpack.advertiseBundleURIs false &&
+
+	GIT_TRACE_PACKET="$PWD/log" \
+	git \
+		-c protocol.version=2 \
+		ls-remote --symref "$BUNDLE_URI_REPO_URI" \
+		>actual 2>err &&
+
+	# Server responded using protocol v2
+	grep "< version 2" log &&
+
+	! grep bundle-uri log
+'
+
+test_expect_success "connect with $BUNDLE_URI_PROTOCOL:// using protocol v2: have bundle-uri" '
+	test_when_finished "rm -f log" &&
+
+	GIT_TRACE_PACKET="$PWD/log" \
+	git \
+		-c protocol.version=2 \
+		ls-remote --symref "$BUNDLE_URI_REPO_URI" \
+		>actual 2>err &&
+
+	# Server responded using protocol v2
+	grep "< version 2" log &&
+
+	# Server advertised bundle-uri capability
+	grep "< bundle-uri" log
+'
+
+test_expect_success "clone with $BUNDLE_URI_PROTOCOL:// using protocol v2: request bundle-uris" '
+	test_when_finished "rm -rf log* cloned*" &&
+
+	GIT_TRACE_PACKET="$PWD/log" \
+	git \
+		-c transfer.bundleURI=false \
+		-c protocol.version=2 \
+		clone "$BUNDLE_URI_REPO_URI" cloned \
+		>actual 2>err &&
+
+	# Server responded using protocol v2
+	grep "< version 2" log &&
+
+	# Server advertised bundle-uri capability
+	grep "< bundle-uri" log &&
+
+	# Client did not issue bundle-uri command
+	! grep "> command=bundle-uri" log &&
+
+	GIT_TRACE_PACKET="$PWD/log" \
+	git \
+		-c transfer.bundleURI=true \
+		-c protocol.version=2 \
+		clone "$BUNDLE_URI_REPO_URI" cloned2 \
+		>actual 2>err &&
+
+	# Server responded using protocol v2
+	grep "< version 2" log &&
+
+	# Server advertised bundle-uri capability
+	grep "< bundle-uri" log &&
+
+	# Client issued bundle-uri command
+	grep "> command=bundle-uri" log &&
+
+	GIT_TRACE_PACKET="$PWD/log3" \
+	git \
+		-c transfer.bundleURI=true \
+		-c protocol.version=2 \
+		clone --bundle-uri="$BUNDLE_URI_BUNDLE_URI" \
+		"$BUNDLE_URI_REPO_URI" cloned3 \
+		>actual 2>err &&
+
+	# Server responded using protocol v2
+	grep "< version 2" log3 &&
+
+	# Server advertised bundle-uri capability
+	grep "< bundle-uri" log3 &&
+
+	# Client did not issue bundle-uri command (--bundle-uri override)
+	! grep "> command=bundle-uri" log3
+'
+
+# The remaining tests will all assume transfer.bundleURI=true
+#
+# This test can be removed when transfer.bundleURI is enabled by default.
+test_expect_success 'enable transfer.bundleURI for remaining tests' '
+	git config --global transfer.bundleURI true
+'
+
+test_expect_success "test bundle-uri with $BUNDLE_URI_PROTOCOL:// using protocol v2" '
+	test_config -C "$BUNDLE_URI_PARENT" \
+		bundle.only.uri "$BUNDLE_URI_BUNDLE_URI_ESCAPED" &&
+
+	# All data about bundle URIs
+	cat >expect <<-EOF &&
+	[bundle]
+		version = 1
+		mode = all
+	[bundle "only"]
+		uri = $BUNDLE_URI_BUNDLE_URI_ESCAPED
+	EOF
+
+	test-tool bundle-uri \
+		ls-remote \
+		"$BUNDLE_URI_REPO_URI" \
+		>actual &&
+	test_cmp_config_output expect actual
+'
+
+test_expect_success "test bundle-uri with $BUNDLE_URI_PROTOCOL:// using protocol v2 and extra data" '
+	test_config -C "$BUNDLE_URI_PARENT" \
+		bundle.only.uri "$BUNDLE_URI_BUNDLE_URI_ESCAPED" &&
+
+	# Extra data should be ignored
+	test_config -C "$BUNDLE_URI_PARENT" bundle.only.extra bogus &&
+
+	# All data about bundle URIs
+	cat >expect <<-EOF &&
+	[bundle]
+		version = 1
+		mode = all
+	[bundle "only"]
+		uri = $BUNDLE_URI_BUNDLE_URI_ESCAPED
+	EOF
+
+	test-tool bundle-uri \
+		ls-remote \
+		"$BUNDLE_URI_REPO_URI" \
+		>actual &&
+	test_cmp_config_output expect actual
+'
+
+test_expect_success "test bundle-uri with $BUNDLE_URI_PROTOCOL:// using protocol v2 with list" '
+	test_config -C "$BUNDLE_URI_PARENT" \
+		bundle.bundle1.uri "$BUNDLE_URI_BUNDLE_URI_ESCAPED-1.bdl" &&
+	test_config -C "$BUNDLE_URI_PARENT" \
+		bundle.bundle2.uri "$BUNDLE_URI_BUNDLE_URI_ESCAPED-2.bdl" &&
+	test_config -C "$BUNDLE_URI_PARENT" \
+		bundle.bundle3.uri "$BUNDLE_URI_BUNDLE_URI_ESCAPED-3.bdl" &&
+
+	# All data about bundle URIs
+	cat >expect <<-EOF &&
+	[bundle]
+		version = 1
+		mode = all
+	[bundle "bundle1"]
+		uri = $BUNDLE_URI_BUNDLE_URI_ESCAPED-1.bdl
+	[bundle "bundle2"]
+		uri = $BUNDLE_URI_BUNDLE_URI_ESCAPED-2.bdl
+	[bundle "bundle3"]
+		uri = $BUNDLE_URI_BUNDLE_URI_ESCAPED-3.bdl
+	EOF
+
+	test-tool bundle-uri \
+		ls-remote \
+		"$BUNDLE_URI_REPO_URI" \
+		>actual &&
+	test_cmp_config_output expect actual
+'
diff --git a/t/lib-bundle.sh b/t/lib-bundle.sh
new file mode 100644
index 0000000..cf7ed81
--- /dev/null
+++ b/t/lib-bundle.sh
@@ -0,0 +1,42 @@
+# Library of git-bundle related functions.
+
+# Display the pack data contained in the bundle file, bypassing the
+# header that contains the signature, prerequisites and references.
+convert_bundle_to_pack () {
+	while read x && test -n "$x"
+	do
+		:;
+	done
+	cat
+}
+
+# Check count of objects in a bundle file.
+# We can use "--thin" opiton to check thin pack, which must be fixed by
+# command `git-index-pack --fix-thin --stdin`.
+test_bundle_object_count () {
+	thin=
+	if test "$1" = "--thin"
+	then
+		thin=t
+		shift
+	fi
+	if test $# -ne 2
+	then
+		echo >&2 "args should be: <bundle> <count>"
+		return 1
+	fi
+	bundle=$1
+	pack=$bundle.pack
+	convert_bundle_to_pack <"$bundle" >"$pack" &&
+	if test -n "$thin"
+	then
+		mv "$pack" "$bundle.thin.pack" &&
+		git index-pack --stdin --fix-thin "$pack" <"$bundle.thin.pack"
+	else
+		git index-pack "$pack"
+	fi || return 1
+	count=$(git show-index <"${pack%pack}idx" | wc -l) &&
+	test $2 = $count && return 0
+	echo >&2 "error: object count for $bundle is $count, not $2"
+	return 1
+}
diff --git a/t/lib-chunk.sh b/t/lib-chunk.sh
new file mode 100644
index 0000000..a7cd9c3
--- /dev/null
+++ b/t/lib-chunk.sh
@@ -0,0 +1,17 @@
+# Shell library for working with "chunk" files (commit-graph, midx, etc).
+
+# corrupt_chunk_file <fn> <chunk> <offset> <bytes>
+#
+# Corrupt a chunk-based file (like a commit-graph) by overwriting the bytes
+# found in the chunk specified by the 4-byte <chunk> identifier. If <offset> is
+# "clear", replace the chunk entirely. Otherwise, overwrite data <offset> bytes
+# into the chunk.
+#
+# The <bytes> are interpreted as pairs of hex digits (so "000000FE" would be
+# big-endian 254).
+corrupt_chunk_file () {
+	fn=$1; shift
+	perl "$TEST_DIRECTORY"/lib-chunk/corrupt-chunk-file.pl \
+		"$@" <"$fn" >"$fn.tmp" &&
+	mv "$fn.tmp" "$fn"
+}
diff --git a/t/lib-chunk/corrupt-chunk-file.pl b/t/lib-chunk/corrupt-chunk-file.pl
new file mode 100644
index 0000000..0e11aad
--- /dev/null
+++ b/t/lib-chunk/corrupt-chunk-file.pl
@@ -0,0 +1,90 @@
+#!/usr/bin/perl
+
+my ($chunk, $seek, $bytes) = @ARGV;
+$bytes =~ s/../chr(hex($&))/ge;
+
+binmode STDIN;
+binmode STDOUT;
+
+# A few helpers to read bytes, or read and copy them to the
+# output.
+sub get {
+	my $n = shift;
+	return unless $n;
+	read(STDIN, my $buf, $n)
+		or die "read error or eof: $!\n";
+	return $buf;
+}
+sub copy {
+	my $buf = get(@_);
+	print $buf;
+	return $buf;
+}
+
+# Some platforms' perl builds don't support 64-bit integers, and hence do not
+# allow packing/unpacking quadwords with "Q". The chunk format uses 64-bit file
+# offsets to support files of any size, but in practice our test suite will
+# only use small files. So we can fake it by asking for two 32-bit values and
+# discarding the first (most significant) one, which is equivalent as long as
+# it's just zero.
+sub unpack_quad {
+	my $bytes = shift;
+	my ($n1, $n2) = unpack("NN", $bytes);
+	die "quad value exceeds 32 bits" if $n1;
+	return $n2;
+}
+sub pack_quad {
+	my $n = shift;
+	my $ret = pack("NN", 0, $n);
+	# double check that our original $n did not exceed the 32-bit limit.
+	# This is presumably impossible on a 32-bit system (which would have
+	# truncated much earlier), but would still alert us on a 64-bit build
+	# of a new test that would fail on a 32-bit build (though we'd
+	# presumably see the die() from unpack_quad() in such a case).
+	die "quad round-trip failed" if unpack_quad($ret) != $n;
+	return $ret;
+}
+
+# read until we find table-of-contents entry for chunk;
+# note that we cheat a bit by assuming 4-byte alignment and
+# that no ToC entry will accidentally look like a header.
+#
+# If we don't find the entry, copy() will hit EOF and exit
+# (which should cause the caller to fail the test).
+while (copy(4) ne $chunk) { }
+my $offset = unpack_quad(copy(8));
+
+# In clear mode, our length will change. So figure out
+# the length by comparing to the offset of the next chunk, and
+# then adjust that offset (and all subsequent) ones.
+my $len;
+if ($seek eq "clear") {
+	my $id;
+	do {
+		$id = copy(4);
+		my $next = unpack_quad(get(8));
+		if (!defined $len) {
+			$len = $next - $offset;
+		}
+		print pack_quad($next - $len + length($bytes));
+	} while (unpack("N", $id));
+}
+
+# and now copy up to our existing chunk data
+copy($offset - tell(STDIN));
+if ($seek eq "clear") {
+	# if clearing, skip past existing data
+	get($len);
+} else {
+	# otherwise, copy up to the requested offset,
+	# and skip past the overwritten bytes
+	copy($seek);
+	get(length($bytes));
+}
+
+# now write out the requested bytes, along
+# with any other remaining data
+print $bytes;
+while (read(STDIN, my $buf, 4096)) {
+	print $buf;
+}
diff --git a/t/lib-commit-graph.sh b/t/lib-commit-graph.sh
new file mode 100755
index 0000000..89b2667
--- /dev/null
+++ b/t/lib-commit-graph.sh
@@ -0,0 +1,74 @@
+#!/bin/sh
+
+# Helper functions for testing commit-graphs.
+
+# Initialize OID cache with oid_version
+test_oid_cache <<-EOF
+oid_version sha1:1
+oid_version sha256:2
+EOF
+
+graph_git_two_modes() {
+	git -c core.commitGraph=true $1 >output &&
+	git -c core.commitGraph=false $1 >expect &&
+	test_cmp expect output
+}
+
+# graph_git_behavior <name> <directory> <branch> <compare>
+#
+# Ensures that a handful of traversal operations produce the same
+# results with and without the commit-graph in use.
+#
+# NOTE: it is a bug to call this function with <directory> containing
+# any characters in $IFS.
+graph_git_behavior() {
+	MSG=$1
+	DIR=$2
+	BRANCH=$3
+	COMPARE=$4
+	test_expect_success "check normal git operations: $MSG" '
+		graph_git_two_modes "${DIR:+-C $DIR} log --oneline $BRANCH" &&
+		graph_git_two_modes "${DIR:+-C $DIR} log --topo-order $BRANCH" &&
+		graph_git_two_modes "${DIR:+-C $DIR} log --graph $COMPARE..$BRANCH" &&
+		graph_git_two_modes "${DIR:+-C $DIR} branch -vv" &&
+		graph_git_two_modes "${DIR:+-C $DIR} merge-base -a $BRANCH $COMPARE"
+	'
+}
+
+graph_read_expect() {
+	OPTIONAL=""
+	NUM_CHUNKS=3
+	DIR="."
+	if test "$1" = -C
+	then
+		shift
+		DIR="$1"
+		shift
+	fi
+	if test -n "$2"
+	then
+		OPTIONAL=" $2"
+		NUM_CHUNKS=$((3 + $(echo "$2" | wc -w)))
+	fi
+	GENERATION_VERSION=2
+	if test -n "$3"
+	then
+		GENERATION_VERSION=$3
+	fi
+	OPTIONS=
+	if test $GENERATION_VERSION -gt 1
+	then
+		OPTIONS=" read_generation_data"
+	fi
+	cat >"$DIR/expect" <<-EOF
+	header: 43475048 1 $(test_oid oid_version) $NUM_CHUNKS 0
+	num_commits: $1
+	chunks: oid_fanout oid_lookup commit_metadata$OPTIONAL
+	options:$OPTIONS
+	EOF
+	(
+		cd "$DIR" &&
+		test-tool read-graph >output &&
+		test_cmp expect output
+	)
+}
diff --git a/t/lib-credential.sh b/t/lib-credential.sh
index dea2cbe..44799c0 100644
--- a/t/lib-credential.sh
+++ b/t/lib-credential.sh
@@ -20,7 +20,7 @@ check() {
 		false
 	fi &&
 	test_cmp expect-stdout stdout &&
-	test_i18ncmp expect-stderr stderr
+	test_cmp expect-stderr stderr
 }
 
 read_chunk() {
@@ -43,6 +43,14 @@ helper_test_clean() {
 	reject $1 https example.com store-user
 	reject $1 https example.com user1
 	reject $1 https example.com user2
+	reject $1 https example.com user-expiry
+	reject $1 https example.com user-expiry-overwrite
+	reject $1 https example.com user4
+	reject $1 https example.com user-distinct-pass
+	reject $1 https example.com user-overwrite
+	reject $1 https example.com user-erase1
+	reject $1 https example.com user-erase2
+	reject $1 https victim.example.com user
 	reject $1 http path.tld user
 	reject $1 https timeout.tld user
 	reject $1 https sso.tld
@@ -166,6 +174,49 @@ helper_test() {
 		EOF
 	'
 
+	test_expect_success "helper ($HELPER) overwrites on store" '
+		check approve $HELPER <<-\EOF &&
+		protocol=https
+		host=example.com
+		username=user-overwrite
+		password=pass1
+		EOF
+		check approve $HELPER <<-\EOF &&
+		protocol=https
+		host=example.com
+		username=user-overwrite
+		password=pass2
+		EOF
+		check fill $HELPER <<-\EOF &&
+		protocol=https
+		host=example.com
+		username=user-overwrite
+		--
+		protocol=https
+		host=example.com
+		username=user-overwrite
+		password=pass2
+		EOF
+		check reject $HELPER <<-\EOF &&
+		protocol=https
+		host=example.com
+		username=user-overwrite
+		password=pass2
+		EOF
+		check fill $HELPER <<-\EOF
+		protocol=https
+		host=example.com
+		username=user-overwrite
+		--
+		protocol=https
+		host=example.com
+		username=user-overwrite
+		password=askpass-password
+		--
+		askpass: Password for '\''https://user-overwrite@example.com'\'':
+		EOF
+	'
+
 	test_expect_success "helper ($HELPER) can forget host" '
 		check reject $HELPER <<-\EOF &&
 		protocol=https
@@ -220,6 +271,31 @@ helper_test() {
 		EOF
 	'
 
+	test_expect_success "helper ($HELPER) does not erase a password distinct from input" '
+		check approve $HELPER <<-\EOF &&
+		protocol=https
+		host=example.com
+		username=user-distinct-pass
+		password=pass1
+		EOF
+		check reject $HELPER <<-\EOF &&
+		protocol=https
+		host=example.com
+		username=user-distinct-pass
+		password=pass2
+		EOF
+		check fill $HELPER <<-\EOF
+		protocol=https
+		host=example.com
+		username=user-distinct-pass
+		--
+		protocol=https
+		host=example.com
+		username=user-distinct-pass
+		password=pass1
+		EOF
+	'
+
 	test_expect_success "helper ($HELPER) can forget user" '
 		check reject $HELPER <<-\EOF &&
 		protocol=https
@@ -270,6 +346,66 @@ helper_test() {
 		password=
 		EOF
 	'
+
+	test_expect_success "helper ($HELPER) erases all matching credentials" '
+		check approve $HELPER <<-\EOF &&
+		protocol=https
+		host=example.com
+		username=user-erase1
+		password=pass1
+		EOF
+		check approve $HELPER <<-\EOF &&
+		protocol=https
+		host=example.com
+		username=user-erase2
+		password=pass1
+		EOF
+		check reject $HELPER <<-\EOF &&
+		protocol=https
+		host=example.com
+		EOF
+		check fill $HELPER <<-\EOF
+		protocol=https
+		host=example.com
+		--
+		protocol=https
+		host=example.com
+		username=askpass-username
+		password=askpass-password
+		--
+		askpass: Username for '\''https://example.com'\'':
+		askpass: Password for '\''https://askpass-username@example.com'\'':
+		EOF
+	'
+
+	: ${GIT_TEST_LONG_CRED_BUFFER:=1024}
+	# 23 bytes accounts for "wwwauth[]=basic realm=" plus NUL
+	LONG_VALUE_LEN=$((GIT_TEST_LONG_CRED_BUFFER - 23))
+	LONG_VALUE=$(perl -e 'print "a" x shift' $LONG_VALUE_LEN)
+
+	test_expect_success "helper ($HELPER) not confused by long header" '
+		check approve $HELPER <<-\EOF &&
+		protocol=https
+		host=victim.example.com
+		username=user
+		password=to-be-stolen
+		EOF
+
+		check fill $HELPER <<-EOF
+		protocol=https
+		host=badguy.example.com
+		wwwauth[]=basic realm=${LONG_VALUE}host=victim.example.com
+		--
+		protocol=https
+		host=badguy.example.com
+		username=askpass-username
+		password=askpass-password
+		wwwauth[]=basic realm=${LONG_VALUE}host=victim.example.com
+		--
+		askpass: Username for '\''https://badguy.example.com'\'':
+		askpass: Password for '\''https://askpass-username@badguy.example.com'\'':
+		EOF
+	'
 }
 
 helper_test_timeout() {
@@ -298,6 +434,110 @@ helper_test_timeout() {
 	'
 }
 
+helper_test_password_expiry_utc() {
+	HELPER=$1
+
+	test_expect_success "helper ($HELPER) stores password_expiry_utc" '
+		check approve $HELPER <<-\EOF
+		protocol=https
+		host=example.com
+		username=user-expiry
+		password=pass
+		password_expiry_utc=9999999999
+		EOF
+	'
+
+	test_expect_success "helper ($HELPER) gets password_expiry_utc" '
+		check fill $HELPER <<-\EOF
+		protocol=https
+		host=example.com
+		username=user-expiry
+		--
+		protocol=https
+		host=example.com
+		username=user-expiry
+		password=pass
+		password_expiry_utc=9999999999
+		--
+		EOF
+	'
+
+	test_expect_success "helper ($HELPER) overwrites when password_expiry_utc changes" '
+		check approve $HELPER <<-\EOF &&
+		protocol=https
+		host=example.com
+		username=user-expiry-overwrite
+		password=pass1
+		password_expiry_utc=9999999998
+		EOF
+		check approve $HELPER <<-\EOF &&
+		protocol=https
+		host=example.com
+		username=user-expiry-overwrite
+		password=pass2
+		password_expiry_utc=9999999999
+		EOF
+		check fill $HELPER <<-\EOF &&
+		protocol=https
+		host=example.com
+		username=user-expiry-overwrite
+		--
+		protocol=https
+		host=example.com
+		username=user-expiry-overwrite
+		password=pass2
+		password_expiry_utc=9999999999
+		EOF
+		check reject $HELPER <<-\EOF &&
+		protocol=https
+		host=example.com
+		username=user-expiry-overwrite
+		password=pass2
+		EOF
+		check fill $HELPER <<-\EOF
+		protocol=https
+		host=example.com
+		username=user-expiry-overwrite
+		--
+		protocol=https
+		host=example.com
+		username=user-expiry-overwrite
+		password=askpass-password
+		--
+		askpass: Password for '\''https://user-expiry-overwrite@example.com'\'':
+		EOF
+	'
+}
+
+helper_test_oauth_refresh_token() {
+	HELPER=$1
+
+	test_expect_success "helper ($HELPER) stores oauth_refresh_token" '
+		check approve $HELPER <<-\EOF
+		protocol=https
+		host=example.com
+		username=user4
+		password=pass
+		oauth_refresh_token=xyzzy
+		EOF
+	'
+
+	test_expect_success "helper ($HELPER) gets oauth_refresh_token" '
+		check fill $HELPER <<-\EOF
+		protocol=https
+		host=example.com
+		username=user4
+		--
+		protocol=https
+		host=example.com
+		username=user4
+		password=pass
+		oauth_refresh_token=xyzzy
+		--
+		EOF
+	'
+}
+
 write_script askpass <<\EOF
 echo >&2 askpass: $*
 what=$(echo $1 | cut -d" " -f1 | tr A-Z a-z | tr -cd a-z)
diff --git a/t/lib-cvs.sh b/t/lib-cvs.sh
index 9b2bcfb..57b9b2d 100644
--- a/t/lib-cvs.sh
+++ b/t/lib-cvs.sh
@@ -36,7 +36,7 @@ setup_cvs_test_repository () {
 test_cvs_co () {
 	# Usage: test_cvs_co BRANCH_NAME
 	rm -rf module-cvs-"$1"
-	if [ "$1" = "master" ]
+	if [ "$1" = "main" ]
 	then
 		$CVS co -P -d module-cvs-"$1" -A module
 	else
@@ -71,8 +71,8 @@ test_cmp_branch_tree () {
 		find . -type d -name .git -prune -o -type f -print
 	) | sort >module-git-"$1".list &&
 	test_cmp module-cvs-"$1".list module-git-"$1".list &&
-	cat module-cvs-"$1".list | while read f
+	while read f
 	do
 		test_cmp_branch_file "$1" "$f" || return 1
-	done
+	done <module-cvs-"$1".list
 }
diff --git a/t/lib-diff-alternative.sh b/t/lib-diff-alternative.sh
index 8d1e408..c4dc2d4 100644
--- a/t/lib-diff-alternative.sh
+++ b/t/lib-diff-alternative.sh
@@ -105,10 +105,67 @@ index $file1..$file2 100644
  }
 EOF
 
+	cat >expect_diffstat <<EOF
+ file1 => file2 | 21 ++++++++++-----------
+ 1 file changed, 10 insertions(+), 11 deletions(-)
+EOF
+
 	STRATEGY=$1
 
+	test_expect_success "setup attributes files for tests with $STRATEGY" '
+		git checkout -b master &&
+		echo "file* diff=driver" >.gitattributes &&
+		git add file1 file2 .gitattributes &&
+		git commit -m "adding files" &&
+		git checkout -b branchA &&
+		echo "file* diff=driverA" >.gitattributes &&
+		git add .gitattributes &&
+		git commit -m "adding driverA as diff driver" &&
+		git checkout master &&
+		git clone --bare --no-local . bare.git
+	'
+
+	test_expect_success "$STRATEGY diff from attributes" '
+		test_must_fail git -c diff.driver.algorithm=$STRATEGY diff --no-index file1 file2 > output &&
+		test_cmp expect output
+	'
+
+	test_expect_success "diff from attributes with bare repo with source" '
+		git -C bare.git --attr-source=branchA -c diff.driver.algorithm=myers \
+			-c diff.driverA.algorithm=$STRATEGY \
+			diff HEAD:file1 HEAD:file2 >output &&
+		test_cmp expect output
+	'
+
+	test_expect_success "diff from attributes with bare repo with invalid source" '
+		test_must_fail git -C bare.git --attr-source=invalid-branch diff \
+			HEAD:file1 HEAD:file2
+	'
+
+	test_expect_success "$STRATEGY diff from attributes has valid diffstat" '
+		echo "file* diff=driver" >.gitattributes &&
+		git config diff.driver.algorithm "$STRATEGY" &&
+		test_must_fail git diff --stat --no-index file1 file2 > output &&
+		test_cmp expect_diffstat output
+	'
+
 	test_expect_success "$STRATEGY diff" '
-		test_must_fail git diff --no-index "--$STRATEGY" file1 file2 > output &&
+		test_must_fail git diff --no-index "--diff-algorithm=$STRATEGY" file1 file2 > output &&
+		test_cmp expect output
+	'
+
+	test_expect_success "$STRATEGY diff command line precedence before attributes" '
+		echo "file* diff=driver" >.gitattributes &&
+		git config diff.driver.algorithm myers &&
+		test_must_fail git diff --no-index "--diff-algorithm=$STRATEGY" file1 file2 > output &&
+		test_cmp expect output
+	'
+
+	test_expect_success "$STRATEGY diff attributes precedence before config" '
+		git config diff.algorithm default &&
+		echo "file* diff=driver" >.gitattributes &&
+		git config diff.driver.algorithm "$STRATEGY" &&
+		test_must_fail git diff --no-index file1 file2 > output &&
 		test_cmp expect output
 	'
 
diff --git a/t/lib-diff-data.sh b/t/lib-diff-data.sh
new file mode 100644
index 0000000..c64ec18
--- /dev/null
+++ b/t/lib-diff-data.sh
@@ -0,0 +1,22 @@
+COPYING_test_data () {
+	cat <<\EOF
+
+ Note that the only valid version of the GPL as far as this project
+ is concerned is _this_ particular version of the license (ie v2, not
+ v2.2 or v3.x or whatever), unless explicitly otherwise stated.
+
+ HOWEVER, in order to allow a migration to GPLv3 if that seems like
+ a good idea, I also ask that people involved with the project make
+ their preferences known. In particular, if you trust me to make that
+ decision, you might note so in your copyright message, ie something
+ like
+
+	This file is licensed under the GPL v2, or a later version
+	at the discretion of Linus.
+
+  might avoid issues. But we can also just decide to synchronize and
+  contact all copyright holders on record if/when the occasion arises.
+
+			Linus Torvalds
+EOF
+}
diff --git a/t/diff-lib.sh b/t/lib-diff.sh
index 2de880f..c4606bd 100644
--- a/t/diff-lib.sh
+++ b/t/lib-diff.sh
@@ -1,3 +1,5 @@
+. "$TEST_DIRECTORY"/lib-diff-data.sh
+
 :
 
 sanitize_diff_raw='/^:/s/ '"\($OID_REGEX\)"' '"\($OID_REGEX\)"' \([A-Z]\)[0-9]*	/ \1 \2 \3#	/'
diff --git a/t/lib-encoding.sh b/t/lib-encoding.sh
new file mode 100644
index 0000000..2dabc8c
--- /dev/null
+++ b/t/lib-encoding.sh
@@ -0,0 +1,25 @@
+# Encoding helpers
+
+test_lazy_prereq NO_UTF16_BOM '
+	test $(printf abc | iconv -f UTF-8 -t UTF-16 | wc -c) = 6
+'
+
+test_lazy_prereq NO_UTF32_BOM '
+	test $(printf abc | iconv -f UTF-8 -t UTF-32 | wc -c) = 12
+'
+
+write_utf16 () {
+	if test_have_prereq NO_UTF16_BOM
+	then
+		printf '\376\377'
+	fi &&
+	iconv -f UTF-8 -t UTF-16
+}
+
+write_utf32 () {
+	if test_have_prereq NO_UTF32_BOM
+	then
+		printf '\0\0\376\377'
+	fi &&
+	iconv -f UTF-8 -t UTF-32
+}
diff --git a/t/lib-gettext.sh b/t/lib-gettext.sh
index 2139b42..cc6bb2c 100644
--- a/t/lib-gettext.sh
+++ b/t/lib-gettext.sh
@@ -17,7 +17,7 @@ else
 	. "$GIT_BUILD_DIR"/git-sh-i18n
 fi
 
-if test_have_prereq GETTEXT && test_have_prereq C_LOCALE_OUTPUT
+if test_have_prereq GETTEXT
 then
 	# is_IS.UTF-8 on Solaris and FreeBSD, is_IS.utf8 on Debian
 	is_IS_locale=$(locale -a 2>/dev/null |
diff --git a/t/lib-git-p4.sh b/t/lib-git-p4.sh
index 5aff2ab..2a5b873 100644
--- a/t/lib-git-p4.sh
+++ b/t/lib-git-p4.sh
@@ -142,10 +142,11 @@ start_p4d () {
 
 p4_add_user () {
 	name=$1 &&
+	fullname="${2:-Dr. $1}"
 	p4 user -f -i <<-EOF
 	User: $name
 	Email: $name@example.com
-	FullName: Dr. $name
+	FullName: $fullname
 	EOF
 }
 
diff --git a/t/lib-git-svn.sh b/t/lib-git-svn.sh
index 547eb3c..ea28971 100644
--- a/t/lib-git-svn.sh
+++ b/t/lib-git-svn.sh
@@ -1,3 +1,7 @@
+if test -z "$TEST_FAILS_SANITIZE_LEAK"
+then
+	TEST_PASSES_SANITIZE_LEAK=true
+fi
 . ./test-lib.sh
 
 if test -n "$NO_SVN_TESTS"
@@ -121,12 +125,22 @@ start_svnserve () {
 		 --listen-host 127.0.0.1 &
 }
 
-prepare_a_utf8_locale () {
-	a_utf8_locale=$(locale -a | sed -n '/\.[uU][tT][fF]-*8$/{
-	p
-	q
-}')
-	if test -n "$a_utf8_locale"
+prepare_utf8_locale () {
+	if test -z "$GIT_TEST_UTF8_LOCALE"
+	then
+		case "${LC_ALL:-$LANG}" in
+		*.[Uu][Tt][Ff]8 | *.[Uu][Tt][Ff]-8)
+			GIT_TEST_UTF8_LOCALE="${LC_ALL:-$LANG}"
+			;;
+		*)
+			GIT_TEST_UTF8_LOCALE=$(locale -a | sed -n '/\.[uU][tT][fF]-*8$/{
+				p
+				q
+			}')
+			;;
+		esac
+	fi
+	if test -n "$GIT_TEST_UTF8_LOCALE"
 	then
 		test_set_prereq UTF8
 	else
diff --git a/t/gitweb-lib.sh b/t/lib-gitweb.sh
index 1f32ca6..1f32ca6 100644
--- a/t/gitweb-lib.sh
+++ b/t/lib-gitweb.sh
diff --git a/t/lib-gpg.sh b/t/lib-gpg.sh
index 9fc5241..add11e8 100644
--- a/t/lib-gpg.sh
+++ b/t/lib-gpg.sh
@@ -13,7 +13,7 @@ test_lazy_prereq GPG '
 	gpg_version=$(gpg --version 2>&1)
 	test $? != 127 || exit 1
 
-	# As said here: http://www.gnupg.org/documentation/faqs.html#q6.19
+	# As said here: https://web.archive.org/web/20130212022238/https://www.gnupg.org/faq/gnupg-faq.html#why-does-gnupg-1.0.6-bail-out-on-keyrings-used-with-1.0.7
 	# the gpg version 1.0.6 did not parse trust packets correctly, so for
 	# that version, creation of signed tags using the generated key fails.
 	case "$gpg_version" in
@@ -40,7 +40,29 @@ test_lazy_prereq GPG '
 		#		> lib-gpg/ownertrust
 		mkdir "$GNUPGHOME" &&
 		chmod 0700 "$GNUPGHOME" &&
-		(gpgconf --kill gpg-agent || : ) &&
+		(gpgconf --kill all || : ) &&
+		gpg --homedir "${GNUPGHOME}" --import \
+			"$TEST_DIRECTORY"/lib-gpg/keyring.gpg &&
+		gpg --homedir "${GNUPGHOME}" --import-ownertrust \
+			"$TEST_DIRECTORY"/lib-gpg/ownertrust &&
+		gpg --homedir "${GNUPGHOME}" --update-trustdb &&
+		gpg --homedir "${GNUPGHOME}" </dev/null >/dev/null \
+			--sign -u committer@example.com
+		;;
+	esac
+'
+
+test_lazy_prereq GPG2 '
+	gpg_version=$(gpg --version 2>&1)
+	test $? != 127 || exit 1
+
+	case "$gpg_version" in
+	"gpg (GnuPG) "[01].*)
+		say "This test requires a GPG version >= v2.0.0"
+		exit 1
+		;;
+	*)
+		(gpgconf --kill all || : ) &&
 		gpg --homedir "${GNUPGHOME}" --import \
 			"$TEST_DIRECTORY"/lib-gpg/keyring.gpg &&
 		gpg --homedir "${GNUPGHOME}" --import-ownertrust \
@@ -72,12 +94,11 @@ test_lazy_prereq GPGSM '
 		--passphrase-fd 0 --pinentry-mode loopback \
 		--import "$TEST_DIRECTORY"/lib-gpg/gpgsm_cert.p12 &&
 
-	gpgsm --homedir "${GNUPGHOME}" -K |
-	grep fingerprint: |
-	cut -d" " -f4 |
-	tr -d "\\n" >"${GNUPGHOME}/trustlist.txt" &&
+	gpgsm --homedir "${GNUPGHOME}" -K --with-colons |
+	awk -F ":" "/^fpr:/ {printf \"%s S relax\\n\", \$10}" \
+		>"${GNUPGHOME}/trustlist.txt" &&
+	(gpgconf --reload all || : ) &&
 
-	echo " S relax" >>"${GNUPGHOME}/trustlist.txt" &&
 	echo hello | gpgsm --homedir "${GNUPGHOME}" >/dev/null \
 	       -u committer@example.com -o /dev/null --sign -
 '
@@ -87,6 +108,89 @@ test_lazy_prereq RFC1991 '
 	echo | gpg --homedir "${GNUPGHOME}" -b --rfc1991 >/dev/null
 '
 
+GPGSSH_KEY_PRIMARY="${GNUPGHOME}/ed25519_ssh_signing_key"
+GPGSSH_KEY_SECONDARY="${GNUPGHOME}/rsa_2048_ssh_signing_key"
+GPGSSH_KEY_UNTRUSTED="${GNUPGHOME}/untrusted_ssh_signing_key"
+GPGSSH_KEY_EXPIRED="${GNUPGHOME}/expired_ssh_signing_key"
+GPGSSH_KEY_NOTYETVALID="${GNUPGHOME}/notyetvalid_ssh_signing_key"
+GPGSSH_KEY_TIMEBOXEDVALID="${GNUPGHOME}/timeboxed_valid_ssh_signing_key"
+GPGSSH_KEY_TIMEBOXEDINVALID="${GNUPGHOME}/timeboxed_invalid_ssh_signing_key"
+GPGSSH_KEY_WITH_PASSPHRASE="${GNUPGHOME}/protected_ssh_signing_key"
+GPGSSH_KEY_ECDSA="${GNUPGHOME}/ecdsa_ssh_signing_key"
+GPGSSH_KEY_PASSPHRASE="super_secret"
+GPGSSH_ALLOWED_SIGNERS="${GNUPGHOME}/ssh.all_valid.allowedSignersFile"
+
+GPGSSH_GOOD_SIGNATURE_TRUSTED='Good "git" signature for'
+GPGSSH_GOOD_SIGNATURE_UNTRUSTED='Good "git" signature with'
+GPGSSH_KEY_NOT_TRUSTED="No principal matched"
+GPGSSH_BAD_SIGNATURE="Signature verification failed"
+
+test_lazy_prereq GPGSSH '
+	ssh_version=$(ssh-keygen -Y find-principals -n "git" 2>&1)
+	test $? != 127 || exit 1
+	echo $ssh_version | grep -q "find-principals:missing signature file"
+	test $? = 0 || exit 1;
+
+	# Setup some keys and an allowed signers file
+	mkdir -p "${GNUPGHOME}" &&
+	chmod 0700 "${GNUPGHOME}" &&
+	(setfacl -k "${GNUPGHOME}" 2>/dev/null || true) &&
+	ssh-keygen -t ed25519 -N "" -C "git ed25519 key" -f "${GPGSSH_KEY_PRIMARY}" >/dev/null &&
+	ssh-keygen -t rsa -b 2048 -N "" -C "git rsa2048 key" -f "${GPGSSH_KEY_SECONDARY}" >/dev/null &&
+	ssh-keygen -t ed25519 -N "${GPGSSH_KEY_PASSPHRASE}" -C "git ed25519 encrypted key" -f "${GPGSSH_KEY_WITH_PASSPHRASE}" >/dev/null &&
+	ssh-keygen -t ecdsa -N "" -f "${GPGSSH_KEY_ECDSA}" >/dev/null &&
+	ssh-keygen -t ed25519 -N "" -C "git ed25519 key" -f "${GPGSSH_KEY_UNTRUSTED}" >/dev/null &&
+
+	cat >"${GPGSSH_ALLOWED_SIGNERS}" <<-EOF &&
+	"principal with number 1" $(cat "${GPGSSH_KEY_PRIMARY}.pub")"
+	"principal with number 2" $(cat "${GPGSSH_KEY_SECONDARY}.pub")"
+	"principal with number 3" $(cat "${GPGSSH_KEY_WITH_PASSPHRASE}.pub")"
+	"principal with number 4" $(cat "${GPGSSH_KEY_ECDSA}.pub")"
+	EOF
+
+	# Verify if at least one key and ssh-keygen works as expected
+	echo "testpayload" |
+	ssh-keygen -Y sign -n "git" -f "${GPGSSH_KEY_PRIMARY}" >gpgssh_prereq.sig &&
+	ssh-keygen -Y find-principals -f "${GPGSSH_ALLOWED_SIGNERS}" -s gpgssh_prereq.sig &&
+	echo "testpayload" |
+	ssh-keygen -Y verify -n "git" -f "${GPGSSH_ALLOWED_SIGNERS}" -I "principal with number 1" -s gpgssh_prereq.sig
+'
+
+test_lazy_prereq GPGSSH_VERIFYTIME '
+	test_have_prereq GPGSSH &&
+	# Check if ssh-keygen has a verify-time option by passing an invalid date to it
+	ssh-keygen -Overify-time=INVALID -Y check-novalidate -n "git" -s doesnotmatter 2>&1 | grep -q -F "Invalid \"verify-time\"" &&
+
+	# Set up keys with key lifetimes
+	ssh-keygen -t ed25519 -N "" -C "timeboxed valid key" -f "${GPGSSH_KEY_TIMEBOXEDVALID}" >/dev/null &&
+	key_valid=$(cat "${GPGSSH_KEY_TIMEBOXEDVALID}.pub") &&
+	ssh-keygen -t ed25519 -N "" -C "timeboxed invalid key" -f "${GPGSSH_KEY_TIMEBOXEDINVALID}" >/dev/null &&
+	key_invalid=$(cat "${GPGSSH_KEY_TIMEBOXEDINVALID}.pub") &&
+	ssh-keygen -t ed25519 -N "" -C "expired key" -f "${GPGSSH_KEY_EXPIRED}" >/dev/null &&
+	key_expired=$(cat "${GPGSSH_KEY_EXPIRED}.pub") &&
+	ssh-keygen -t ed25519 -N "" -C "not yet valid key" -f "${GPGSSH_KEY_NOTYETVALID}" >/dev/null &&
+	key_notyetvalid=$(cat "${GPGSSH_KEY_NOTYETVALID}.pub") &&
+
+	# Timestamps outside of test_tick span
+	ts2005a=20050401000000 ts2005b=200504020000 &&
+	# Timestamps within test_tick span
+	ts2005c=20050407000000 ts2005d=200504100000 &&
+	# Definitely not yet valid / expired timestamps
+	ts2000=20000101000000 ts2999=29990101000000 &&
+
+	cat >>"${GPGSSH_ALLOWED_SIGNERS}" <<-EOF &&
+	"timeboxed valid key" valid-after="$ts2005c",valid-before="$ts2005d" $key_valid"
+	"timeboxed invalid key" valid-after="$ts2005a",valid-before="$ts2005b" $key_invalid"
+	"principal with expired key" valid-before="$ts2000" $key_expired"
+	"principal with not yet valid key" valid-after="$ts2999" $key_notyetvalid"
+	EOF
+
+	# and verify ssh-keygen verifies the key lifetime
+	echo "testpayload" |
+	ssh-keygen -Y sign -n "git" -f "${GPGSSH_KEY_EXPIRED}" >gpgssh_verifytime_prereq.sig &&
+	! (ssh-keygen -Y verify -n "git" -f "${GPGSSH_ALLOWED_SIGNERS}" -I "principal with expired key" -s gpgssh_verifytime_prereq.sig)
+'
+
 sanitize_pgp() {
 	perl -ne '
 		/^-----END PGP/ and $in_pgp = 0;
diff --git a/t/lib-httpd.sh b/t/lib-httpd.sh
index d2edfa4..d83bafe 100644
--- a/t/lib-httpd.sh
+++ b/t/lib-httpd.sh
@@ -25,11 +25,12 @@
 #    LIB_HTTPD_DAV               enable DAV
 #    LIB_HTTPD_SVN               enable SVN at given location (e.g. "svn")
 #    LIB_HTTPD_SSL               enable SSL
+#    LIB_HTTPD_PROXY             enable proxy
 #
 # Copyright (c) 2008 Clemens Buchacher <drizzd@aon.at>
 #
 
-if test -n "$NO_CURL"
+if ! test_have_prereq LIBCURL
 then
 	skip_all='skipping test, git built without http support'
 	test_done
@@ -54,20 +55,31 @@ fi
 
 HTTPD_PARA=""
 
-for DEFAULT_HTTPD_PATH in '/usr/sbin/httpd' '/usr/sbin/apache2'
+for DEFAULT_HTTPD_PATH in '/usr/sbin/httpd' \
+			  '/usr/sbin/apache2' \
+			  "$(command -v httpd)" \
+			  "$(command -v apache2)"
 do
-	if test -x "$DEFAULT_HTTPD_PATH"
+	if test -n "$DEFAULT_HTTPD_PATH" && test -x "$DEFAULT_HTTPD_PATH"
 	then
 		break
 	fi
 done
 
+if test -x "$DEFAULT_HTTPD_PATH"
+then
+	DETECTED_HTTPD_ROOT="$("$DEFAULT_HTTPD_PATH" -V 2>/dev/null | sed -n 's/^ -D HTTPD_ROOT="\(.*\)"$/\1/p')"
+fi
+
 for DEFAULT_HTTPD_MODULE_PATH in '/usr/libexec/apache2' \
 				 '/usr/lib/apache2/modules' \
 				 '/usr/lib64/httpd/modules' \
-				 '/usr/lib/httpd/modules'
+				 '/usr/lib/httpd/modules' \
+				 '/usr/libexec/httpd' \
+				 '/usr/lib/apache2' \
+				 "${DETECTED_HTTPD_ROOT:+${DETECTED_HTTPD_ROOT}/modules}"
 do
-	if test -d "$DEFAULT_HTTPD_MODULE_PATH"
+	if test -n "$DEFAULT_HTTPD_MODULE_PATH" && test -d "$DEFAULT_HTTPD_MODULE_PATH"
 	then
 		break
 	fi
@@ -98,16 +110,19 @@ then
 fi
 
 HTTPD_VERSION=$($LIB_HTTPD_PATH -v | \
-	sed -n 's/^Server version: Apache\/\([0-9]*\)\..*$/\1/p; q')
+	sed -n 's/^Server version: Apache\/\([0-9.]*\).*$/\1/p; q')
+HTTPD_VERSION_MAJOR=$(echo $HTTPD_VERSION | cut -d. -f1)
+HTTPD_VERSION_MINOR=$(echo $HTTPD_VERSION | cut -d. -f2)
 
-if test -n "$HTTPD_VERSION"
+if test -n "$HTTPD_VERSION_MAJOR"
 then
 	if test -z "$LIB_HTTPD_MODULE_PATH"
 	then
-		if ! test $HTTPD_VERSION -ge 2
+		if ! test "$HTTPD_VERSION_MAJOR" -eq 2 ||
+		   ! test "$HTTPD_VERSION_MINOR" -ge 4
 		then
 			test_skip_or_die GIT_TEST_HTTPD \
-				"at least Apache version 2 is required"
+				"at least Apache version 2.4 is required"
 		fi
 		if ! test -d "$DEFAULT_HTTPD_MODULE_PATH"
 		then
@@ -122,6 +137,20 @@ else
 		"Could not identify web server at '$LIB_HTTPD_PATH'"
 fi
 
+if test -n "$LIB_HTTPD_DAV" && test -f /etc/os-release
+then
+	case "$(grep "^ID=" /etc/os-release | cut -d= -f2-)" in
+	alpine)
+		# The WebDAV module in Alpine Linux is broken at least up to
+		# Alpine v3.16 as the default DBM driver is missing.
+		#
+		# https://gitlab.alpinelinux.org/alpine/aports/-/issues/13112
+		test_skip_or_die GIT_TEST_HTTPD \
+			"Apache WebDAV module does not have default DBM backend driver"
+		;;
+	esac
+fi
+
 install_script () {
 	write_script "$HTTPD_ROOT_PATH/$1" <"$TEST_PATH/$1"
 }
@@ -129,12 +158,15 @@ install_script () {
 prepare_httpd() {
 	mkdir -p "$HTTPD_DOCUMENT_ROOT_PATH"
 	cp "$TEST_PATH"/passwd "$HTTPD_ROOT_PATH"
+	cp "$TEST_PATH"/proxy-passwd "$HTTPD_ROOT_PATH"
 	install_script incomplete-length-upload-pack-v2-http.sh
 	install_script incomplete-body-upload-pack-v2-http.sh
+	install_script error-no-report.sh
 	install_script broken-smart-http.sh
 	install_script error-smart-http.sh
 	install_script error.sh
 	install_script apply-one-time-perl.sh
+	install_script nph-custom-auth.sh
 
 	ln -s "$LIB_HTTPD_MODULE_PATH" "$HTTPD_ROOT_PATH/modules"
 
@@ -171,6 +203,30 @@ prepare_httpd() {
 			export LIB_HTTPD_SVN LIB_HTTPD_SVNPATH
 		fi
 	fi
+
+	if test -n "$LIB_HTTPD_PROXY"
+	then
+		HTTPD_PARA="$HTTPD_PARA -DPROXY"
+	fi
+}
+
+enable_http2 () {
+	HTTPD_PARA="$HTTPD_PARA -DHTTP2"
+	test_set_prereq HTTP2
+}
+
+enable_cgipassauth () {
+	# We are looking for 2.4.13 or more recent. Since we only support
+	# 2.4 and up, no need to check for older major/minor.
+	if test "$HTTPD_VERSION_MAJOR" = 2 &&
+	   test "$HTTPD_VERSION_MINOR" = 4 &&
+	   test "$(echo $HTTPD_VERSION | cut -d. -f3)" -lt 13
+	then
+		echo >&4 "apache $HTTPD_VERSION too old for CGIPassAuth"
+		return
+	fi
+	HTTPD_PARA="$HTTPD_PARA -DUSE_CGIPASSAUTH"
+	test_set_prereq CGIPASSAUTH
 }
 
 start_httpd() {
@@ -210,8 +266,12 @@ test_http_push_nonff () {
 		git commit -a -m path2 --amend &&
 
 		test_must_fail git push -v origin >output 2>&1 &&
-		(cd "$REMOTE_REPO" &&
-		 test $HEAD = $(git rev-parse --verify HEAD))
+		(
+			cd "$REMOTE_REPO" &&
+			echo "$HEAD" >expect &&
+			git rev-parse --verify HEAD >actual &&
+			test_cmp expect actual
+		)
 	'
 
 	test_expect_success 'non-fast-forward push show ref status' '
@@ -219,7 +279,7 @@ test_http_push_nonff () {
 	'
 
 	test_expect_success 'non-fast-forward push shows help message' '
-		test_i18ngrep "Updates were rejected because" output
+		test_grep "Updates were rejected because" output
 	'
 
 	test_expect_${EXPECT_CAS_RESULT} 'force with lease aka cas' '
@@ -273,11 +333,11 @@ expect_askpass() {
 		none)
 			;;
 		pass)
-			echo "askpass: Password for 'http://$2@$dest': "
+			echo "askpass: Password for '$HTTPD_PROTO://$2@$dest': "
 			;;
 		both)
-			echo "askpass: Username for 'http://$dest': "
-			echo "askpass: Password for 'http://$2@$dest': "
+			echo "askpass: Username for '$HTTPD_PROTO://$dest': "
+			echo "askpass: Password for '$HTTPD_PROTO://$2@$dest': "
 			;;
 		*)
 			false
diff --git a/t/lib-httpd/apache.conf b/t/lib-httpd/apache.conf
index afa91e3..022276a 100644
--- a/t/lib-httpd/apache.conf
+++ b/t/lib-httpd/apache.conf
@@ -29,17 +29,11 @@ ErrorLog error.log
 	LoadModule setenvif_module modules/mod_setenvif.so
 </IfModule>
 
-<IfVersion < 2.4>
-LockFile accept.lock
-</IfVersion>
-
-<IfVersion < 2.1>
-<IfModule !mod_auth.c>
-	LoadModule auth_module modules/mod_auth.so
-</IfModule>
-</IfVersion>
+<IfDefine HTTP2>
+LoadModule http2_module modules/mod_http2.so
+Protocols h2 h2c
+</IfDefine>
 
-<IfVersion >= 2.1>
 <IfModule !mod_auth_basic.c>
 	LoadModule auth_basic_module modules/mod_auth_basic.so
 </IfModule>
@@ -52,9 +46,23 @@ LockFile accept.lock
 <IfModule !mod_authz_host.c>
 	LoadModule authz_host_module modules/mod_authz_host.so
 </IfModule>
-</IfVersion>
 
-<IfVersion >= 2.4>
+<IfDefine PROXY>
+<IfModule !mod_proxy.c>
+	LoadModule proxy_module modules/mod_proxy.so
+</IfModule>
+<IfModule !mod_proxy_http.c>
+	LoadModule proxy_http_module modules/mod_proxy_http.so
+</IfModule>
+ProxyRequests On
+<Proxy "*">
+	AuthType Basic
+	AuthName "proxy-auth"
+	AuthUserFile proxy-passwd
+	Require valid-user
+</Proxy>
+</IfDefine>
+
 <IfModule !mod_authn_core.c>
 	LoadModule authn_core_module modules/mod_authn_core.so
 </IfModule>
@@ -64,28 +72,38 @@ LockFile accept.lock
 <IfModule !mod_access_compat.c>
 	LoadModule access_compat_module modules/mod_access_compat.so
 </IfModule>
-<IfModule !mod_mpm_prefork.c>
-	LoadModule mpm_prefork_module modules/mod_mpm_prefork.so
-</IfModule>
 <IfModule !mod_unixd.c>
 	LoadModule unixd_module modules/mod_unixd.so
 </IfModule>
-</IfVersion>
+
+<IfDefine HTTP2>
+<IfModule !mod_mpm_event.c>
+	LoadModule mpm_event_module modules/mod_mpm_event.so
+</IfModule>
+</IfDefine>
+<IfDefine !HTTP2>
+<IfModule !mod_mpm_prefork.c>
+	LoadModule mpm_prefork_module modules/mod_mpm_prefork.so
+</IfModule>
+</IfDefine>
 
 PassEnv GIT_VALGRIND
 PassEnv GIT_VALGRIND_OPTIONS
 PassEnv GNUPGHOME
 PassEnv ASAN_OPTIONS
 PassEnv LSAN_OPTIONS
+PassEnv UBSAN_OPTIONS
 PassEnv GIT_TRACE
 PassEnv GIT_CONFIG_NOSYSTEM
 PassEnv GIT_TEST_SIDEBAND_ALL
-
-SetEnvIf Git-Protocol ".*" GIT_PROTOCOL=$0
+PassEnv LANG
+PassEnv LC_ALL
 
 Alias /dumb/ www/
 Alias /auth/dumb/ www/auth/dumb/
 
+SetEnv PERL_PATH ${PERL_PATH}
+
 <LocationMatch /smart/>
 	SetEnv GIT_EXEC_PATH ${GIT_EXEC_PATH}
 	SetEnv GIT_HTTP_EXPORT_ALL
@@ -110,6 +128,10 @@ Alias /auth/dumb/ www/auth/dumb/
 	Header set Set-Cookie name=value
 </LocationMatch>
 <LocationMatch /smart_headers/>
+	<RequireAll>
+		Require expr %{HTTP:x-magic-one} == 'abra'
+		Require expr %{HTTP:x-magic-two} == 'cadabra'
+	</RequireAll>
 	SetEnv GIT_EXEC_PATH ${GIT_EXEC_PATH}
 	SetEnv GIT_HTTP_EXPORT_ALL
 </LocationMatch>
@@ -117,14 +139,28 @@ Alias /auth/dumb/ www/auth/dumb/
 	SetEnv GIT_EXEC_PATH ${GIT_EXEC_PATH}
 	SetEnv GIT_HTTP_EXPORT_ALL
 </LocationMatch>
+<LocationMatch /smart_v0/>
+	SetEnv GIT_EXEC_PATH ${GIT_EXEC_PATH}
+	SetEnv GIT_HTTP_EXPORT_ALL
+	SetEnv GIT_PROTOCOL
+</LocationMatch>
+<LocationMatch /custom_auth/>
+	SetEnv GIT_EXEC_PATH ${GIT_EXEC_PATH}
+	SetEnv GIT_HTTP_EXPORT_ALL
+	<IfDefine USE_CGIPASSAUTH>
+	CGIPassAuth on
+	</IfDefine>
+</LocationMatch>
 ScriptAlias /smart/incomplete_length/git-upload-pack incomplete-length-upload-pack-v2-http.sh/
 ScriptAlias /smart/incomplete_body/git-upload-pack incomplete-body-upload-pack-v2-http.sh/
+ScriptAlias /smart/no_report/git-receive-pack error-no-report.sh/
 ScriptAliasMatch /error_git_upload_pack/(.*)/git-upload-pack error.sh/
 ScriptAliasMatch /smart_*[^/]*/(.*) ${GIT_EXEC_PATH}/git-http-backend/$1
 ScriptAlias /broken_smart/ broken-smart-http.sh/
 ScriptAlias /error_smart/ error-smart-http.sh/
 ScriptAlias /error/ error.sh/
 ScriptAliasMatch /one_time_perl/(.*) apply-one-time-perl.sh/$1
+ScriptAliasMatch /custom_auth/(.*) nph-custom-auth.sh/$1
 <Directory ${GIT_EXEC_PATH}>
 	Options FollowSymlinks
 </Directory>
@@ -134,6 +170,9 @@ ScriptAliasMatch /one_time_perl/(.*) apply-one-time-perl.sh/$1
 <Files incomplete-body-upload-pack-v2-http.sh>
 	Options ExecCGI
 </Files>
+<Files error-no-report.sh>
+	Options ExecCGI
+</Files>
 <Files broken-smart-http.sh>
 	Options ExecCGI
 </Files>
@@ -183,18 +222,6 @@ RewriteRule ^/intern-redir/(.*)/foo$ /smart/$1 [PT]
 RewriteRule ^/redir-objects/(.*/info/refs)$ /dumb/$1 [PT]
 RewriteRule ^/redir-objects/(.*/objects/.*)$ /dumb/$1 [R=301]
 
-# Apache 2.2 does not understand <RequireAll>, so we use RewriteCond.
-# And as RewriteCond does not allow testing for non-matches, we match
-# the desired case first (one has abra, two has cadabra), and let it
-# pass by marking the RewriteRule as [L], "last rule, do not process
-# any other matching RewriteRules after this"), and then have another
-# RewriteRule that matches all other cases and lets them fail via '[F]',
-# "fail the request".
-RewriteCond %{HTTP:x-magic-one} =abra
-RewriteCond %{HTTP:x-magic-two} =cadabra
-RewriteRule ^/smart_headers/.* - [L]
-RewriteRule ^/smart_headers/.* - [F]
-
 <IfDefine SSL>
 LoadModule ssl_module modules/mod_ssl.so
 
@@ -203,7 +230,6 @@ SSLCertificateKeyFile httpd.pem
 SSLRandomSeed startup file:/dev/urandom 512
 SSLRandomSeed connect file:/dev/urandom 512
 SSLSessionCache none
-SSLMutex file:ssl_mutex
 SSLEngine On
 </IfDefine>
 
diff --git a/t/lib-httpd/apply-one-time-perl.sh b/t/lib-httpd/apply-one-time-perl.sh
index 09a0abd..d7f9fed 100644
--- a/t/lib-httpd/apply-one-time-perl.sh
+++ b/t/lib-httpd/apply-one-time-perl.sh
@@ -13,7 +13,7 @@ then
 	export LC_ALL
 
 	"$GIT_EXEC_PATH/git-http-backend" >out
-	perl -pe "$(cat one-time-perl)" out >out_modified
+	"$PERL_PATH" -pe "$(cat one-time-perl)" out >out_modified
 
 	if cmp -s out out_modified
 	then
diff --git a/t/lib-httpd/error-no-report.sh b/t/lib-httpd/error-no-report.sh
new file mode 100644
index 0000000..39ff75b
--- /dev/null
+++ b/t/lib-httpd/error-no-report.sh
@@ -0,0 +1,6 @@
+echo "Content-Type: application/x-git-receive-pack-result"
+echo
+printf '0013\001000eunpack ok\n'
+printf '0015\002skipping report\n'
+printf '0009\0010000'
+printf '0000'
diff --git a/t/lib-httpd/nph-custom-auth.sh b/t/lib-httpd/nph-custom-auth.sh
new file mode 100644
index 0000000..f5345e7
--- /dev/null
+++ b/t/lib-httpd/nph-custom-auth.sh
@@ -0,0 +1,39 @@
+#!/bin/sh
+
+VALID_CREDS_FILE=custom-auth.valid
+CHALLENGE_FILE=custom-auth.challenge
+
+#
+# If $VALID_CREDS_FILE exists in $HTTPD_ROOT_PATH, consider each line as a valid
+# credential for the current request. Each line in the file is considered a
+# valid HTTP Authorization header value. For example:
+#
+# Basic YWxpY2U6c2VjcmV0LXBhc3N3ZA==
+#
+# If $CHALLENGE_FILE exists in $HTTPD_ROOT_PATH, output the contents as headers
+# in a 401 response if no valid authentication credentials were included in the
+# request. For example:
+#
+# WWW-Authenticate: Bearer authorize_uri="id.example.com" p=1 q=0
+# WWW-Authenticate: Basic realm="example.com"
+#
+
+if test -n "$HTTP_AUTHORIZATION" && \
+	grep -Fqsx "${HTTP_AUTHORIZATION}" "$VALID_CREDS_FILE"
+then
+	# Note that although git-http-backend returns a status line, it
+	# does so using a CGI 'Status' header. Because this script is an
+	# No Parsed Headers (NPH) script, we must return a real HTTP
+	# status line.
+	# This is only a test script, so we don't bother to check for
+	# the actual status from git-http-backend and always return 200.
+	echo 'HTTP/1.1 200 OK'
+	exec "$GIT_EXEC_PATH"/git-http-backend
+fi
+
+echo 'HTTP/1.1 401 Authorization Required'
+if test -f "$CHALLENGE_FILE"
+then
+	cat "$CHALLENGE_FILE"
+fi
+echo
diff --git a/t/lib-httpd/passwd b/t/lib-httpd/passwd
index 99a34d6..d9c122f 100644
--- a/t/lib-httpd/passwd
+++ b/t/lib-httpd/passwd
@@ -1 +1 @@
-user@host:xb4E8pqD81KQs
+user@host:$apr1$LGPmCZWj$9vxEwj5Z5GzQLBMxp3mCx1
diff --git a/t/lib-httpd/proxy-passwd b/t/lib-httpd/proxy-passwd
new file mode 100644
index 0000000..2ad7705
--- /dev/null
+++ b/t/lib-httpd/proxy-passwd
@@ -0,0 +1 @@
+proxuser:$apr1$RxS6MLkD$DYsqQdflheq4GPNxzJpx5.
diff --git a/t/lib-httpd/ssl.cnf b/t/lib-httpd/ssl.cnf
index 6dab257..812e825 100644
--- a/t/lib-httpd/ssl.cnf
+++ b/t/lib-httpd/ssl.cnf
@@ -1,7 +1,7 @@
 RANDFILE                = $ENV::RANDFILE_PATH
 
 [ req ]
-default_bits            = 1024
+default_bits            = 2048
 distinguished_name      = req_distinguished_name
 prompt                  = no
 [ req_distinguished_name ]
diff --git a/t/lib-log-graph.sh b/t/lib-log-graph.sh
index 1184cce..bf952ef 100644
--- a/t/lib-log-graph.sh
+++ b/t/lib-log-graph.sh
@@ -12,13 +12,13 @@ sanitize_log_output () {
 lib_test_cmp_graph () {
 	git log --graph "$@" >output &&
 	sed 's/ *$//' >output.sanitized <output &&
-	test_i18ncmp expect output.sanitized
+	test_cmp expect output.sanitized
 }
 
 lib_test_cmp_short_graph () {
 	git log --graph --pretty=short "$@" >output &&
 	sanitize_log_output >output.sanitized <output &&
-	test_i18ncmp expect output.sanitized
+	test_cmp expect output.sanitized
 }
 
 lib_test_cmp_colored_graph () {
diff --git a/t/lib-merge.sh b/t/lib-merge.sh
new file mode 100644
index 0000000..8734ebf
--- /dev/null
+++ b/t/lib-merge.sh
@@ -0,0 +1,13 @@
+# Helper functions used by merge tests.
+
+test_expect_merge_algorithm () {
+	status_for_recursive=$1 status_for_ort=$2
+	shift 2
+
+	if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+	then
+		test_expect_${status_for_ort} "$@"
+	else
+		test_expect_${status_for_recursive} "$@"
+	fi
+}
diff --git a/t/lib-midx.sh b/t/lib-midx.sh
new file mode 100644
index 0000000..1261994
--- /dev/null
+++ b/t/lib-midx.sh
@@ -0,0 +1,8 @@
+# test_midx_consistent <objdir>
+test_midx_consistent () {
+	ls $1/pack/pack-*.idx | xargs -n 1 basename | sort >expect &&
+	test-tool read-midx $1 | grep ^pack-.*\.idx$ | sort >actual &&
+
+	test_cmp expect actual &&
+	git multi-pack-index --object-dir=$1 verify
+}
diff --git a/t/lib-pager.sh b/t/lib-pager.sh
index 3aa7a3f..e5eb28d 100644
--- a/t/lib-pager.sh
+++ b/t/lib-pager.sh
@@ -3,7 +3,7 @@
 test_expect_success 'determine default pager' '
 	test_might_fail git config --unset core.pager &&
 	less=$(
-		unset PAGER GIT_PAGER;
+		sane_unset PAGER GIT_PAGER &&
 		git var GIT_PAGER
 	) &&
 	test -n "$less"
diff --git a/t/lib-parallel-checkout.sh b/t/lib-parallel-checkout.sh
new file mode 100644
index 0000000..8324d6c
--- /dev/null
+++ b/t/lib-parallel-checkout.sh
@@ -0,0 +1,49 @@
+# Helpers for tests invoking parallel-checkout
+
+# Parallel checkout tests need full control of the number of workers
+unset GIT_TEST_CHECKOUT_WORKERS
+
+set_checkout_config () {
+	if test $# -ne 2
+	then
+		BUG "usage: set_checkout_config <workers> <threshold>"
+	fi &&
+
+	test_config_global checkout.workers $1 &&
+	test_config_global checkout.thresholdForParallelism $2
+}
+
+# Run "${@:2}" and check that $1 checkout workers were used
+test_checkout_workers () {
+	if test $# -lt 2
+	then
+		BUG "too few arguments to test_checkout_workers"
+	fi &&
+
+	local expected_workers="$1" &&
+	shift &&
+
+	local trace_file=trace-test-checkout-workers &&
+	rm -f "$trace_file" &&
+	(
+		GIT_TRACE2="$(pwd)/$trace_file" &&
+		export GIT_TRACE2 &&
+		"$@" 2>&8
+	) &&
+
+	local workers="$(grep "child_start\[..*\] git checkout--worker" "$trace_file" | wc -l)" &&
+	test $workers -eq $expected_workers &&
+	rm "$trace_file"
+} 8>&2 2>&4
+
+# Verify that both the working tree and the index were created correctly
+verify_checkout () {
+	if test $# -ne 1
+	then
+		BUG "usage: verify_checkout <repository path>"
+	fi &&
+
+	git -C "$1" diff-index --ignore-submodules=none --exit-code HEAD -- &&
+	git -C "$1" status --porcelain >"$1".status &&
+	test_must_be_empty "$1".status
+}
diff --git a/t/lib-patch-mode.sh b/t/lib-patch-mode.sh
index cfd76bf..89ca1f7 100644
--- a/t/lib-patch-mode.sh
+++ b/t/lib-patch-mode.sh
@@ -29,8 +29,12 @@ set_and_save_state () {
 
 # verify_state <path> <expected-worktree-content> <expected-index-content>
 verify_state () {
-	test "$(cat "$1")" = "$2" &&
-	test "$(git show :"$1")" = "$3"
+	echo "$2" >expect &&
+	test_cmp expect "$1" &&
+
+	echo "$3" >expect &&
+	git show :"$1" >actual &&
+	test_cmp expect actual
 }
 
 # verify_saved_state <path>
@@ -46,5 +50,6 @@ save_head () {
 }
 
 verify_saved_head () {
-	test "$(cat _head)" = "$(git rev-parse HEAD)"
+	git rev-parse HEAD >actual &&
+	test_cmp _head actual
 }
diff --git a/t/lib-perl.sh b/t/lib-perl.sh
new file mode 100644
index 0000000..d0bf509
--- /dev/null
+++ b/t/lib-perl.sh
@@ -0,0 +1,19 @@
+# Copyright (c) 2022 Ævar Arnfjörð Bjarmason
+
+test_lazy_prereq PERL_TEST_MORE '
+	perl -MTest::More -e 0
+'
+
+skip_all_if_no_Test_More () {
+	if ! test_have_prereq PERL
+	then
+		skip_all='skipping perl interface tests, perl not available'
+		test_done
+	fi
+
+	if ! test_have_prereq PERL_TEST_MORE
+	then
+		skip_all="Perl Test::More unavailable, skipping test"
+		test_done
+	fi
+}
diff --git a/t/lib-proto-disable.sh b/t/lib-proto-disable.sh
index 83babe5..890622b 100644
--- a/t/lib-proto-disable.sh
+++ b/t/lib-proto-disable.sh
@@ -1,7 +1,7 @@
 # Test routines for checking protocol disabling.
 
-# Test clone/fetch/push with GIT_ALLOW_PROTOCOL whitelist
-test_whitelist () {
+# Test clone/fetch/push with GIT_ALLOW_PROTOCOL environment variable
+test_allow_var () {
 	desc=$1
 	proto=$2
 	url=$3
@@ -183,7 +183,7 @@ test_config () {
 #   $2 - machine-readable name of the protocol
 #   $3 - the URL to try cloning
 test_proto () {
-	test_whitelist "$@"
+	test_allow_var "$@"
 
 	test_config "$@"
 }
diff --git a/t/lib-read-tree-m-3way.sh b/t/lib-read-tree-m-3way.sh
index 168329a..2da25b3 100644
--- a/t/lib-read-tree-m-3way.sh
+++ b/t/lib-read-tree-m-3way.sh
@@ -3,21 +3,21 @@
 mkdir Z
 for a in N D M
 do
-    for b in N D M
-    do
-        p=$a$b
+	for b in N D M
+	do
+		p=$a$b
 	echo This is $p from the original tree. >$p
 	echo This is Z/$p from the original tree. >Z/$p
-	test_expect_success \
-	    "adding test file $p and Z/$p" \
-	    'git update-index --add $p &&
-	    git update-index --add Z/$p'
+	test_expect_success "adding test file $p and Z/$p" '
+	    git update-index --add $p &&
+	    git update-index --add Z/$p
+    '
     done
 done
 echo This is SS from the original tree. >SS
-test_expect_success \
-    'adding test file SS' \
-    'git update-index --add SS'
+test_expect_success 'adding test file SS' '
+	git update-index --add SS
+'
 cat >TT <<\EOF
 This is a trivial merge sample text.
 Branch A is expected to upcase this word, here.
@@ -30,12 +30,12 @@ At the very end, here comes another line, that is
 the word, expected to be upcased by Branch B.
 This concludes the trivial merge sample file.
 EOF
-test_expect_success \
-    'adding test file TT' \
-    'git update-index --add TT'
-test_expect_success \
-    'prepare initial tree' \
-    'tree_O=$(git write-tree)'
+test_expect_success 'adding test file TT' '
+	git update-index --add TT
+'
+test_expect_success 'prepare initial tree' '
+	tree_O=$(git write-tree)
+'
 
 ################################################################
 # Branch A and B makes the changes according to the above matrix.
@@ -45,48 +45,48 @@ test_expect_success \
 
 to_remove=$(echo D? Z/D?)
 rm -f $to_remove
-test_expect_success \
-    'change in branch A (removal)' \
-    'git update-index --remove $to_remove'
+test_expect_success 'change in branch A (removal)' '
+	git update-index --remove $to_remove
+'
 
 for p in M? Z/M?
 do
-    echo This is modified $p in the branch A. >$p
-    test_expect_success \
-	'change in branch A (modification)' \
-        "git update-index $p"
+	echo This is modified $p in the branch A. >$p
+	test_expect_success 'change in branch A (modification)' '
+		git update-index $p
+	'
 done
 
 for p in AN AA Z/AN Z/AA
 do
-    echo This is added $p in the branch A. >$p
-    test_expect_success \
-	'change in branch A (addition)' \
-	"git update-index --add $p"
+	echo This is added $p in the branch A. >$p
+	test_expect_success 'change in branch A (addition)' '
+		git update-index --add $p
+	'
 done
 
 echo This is SS from the modified tree. >SS
 echo This is LL from the modified tree. >LL
-test_expect_success \
-    'change in branch A (addition)' \
-    'git update-index --add LL &&
-     git update-index SS'
+test_expect_success 'change in branch A (addition)' '
+	git update-index --add LL &&
+	git update-index SS
+'
 mv TT TT-
 sed -e '/Branch A/s/word/WORD/g' <TT- >TT
 rm -f TT-
-test_expect_success \
-    'change in branch A (edit)' \
-    'git update-index TT'
+test_expect_success 'change in branch A (edit)' '
+	git update-index TT
+'
 
 mkdir DF
 echo Branch A makes a file at DF/DF, creating a directory DF. >DF/DF
-test_expect_success \
-    'change in branch A (change file to directory)' \
-    'git update-index --add DF/DF'
+test_expect_success 'change in branch A (change file to directory)' '
+	git update-index --add DF/DF
+'
 
-test_expect_success \
-    'recording branch A tree' \
-    'tree_A=$(git write-tree)'
+test_expect_success 'recording branch A tree' '
+	tree_A=$(git write-tree)
+'
 
 ################################################################
 # Branch B
@@ -94,65 +94,65 @@ test_expect_success \
 
 rm -rf [NDMASLT][NDMASLT] Z DF
 mkdir Z
-test_expect_success \
-    'reading original tree and checking out' \
-    'git read-tree $tree_O &&
-     git checkout-index -a'
+test_expect_success 'reading original tree and checking out' '
+	git read-tree $tree_O &&
+	git checkout-index -a
+'
 
 to_remove=$(echo ?D Z/?D)
 rm -f $to_remove
-test_expect_success \
-    'change in branch B (removal)' \
-    "git update-index --remove $to_remove"
+test_expect_success 'change in branch B (removal)' '
+	git update-index --remove $to_remove
+'
 
 for p in ?M Z/?M
 do
-    echo This is modified $p in the branch B. >$p
-    test_expect_success \
-	'change in branch B (modification)' \
-	"git update-index $p"
+	echo This is modified $p in the branch B. >$p
+	test_expect_success 'change in branch B (modification)' '
+		git update-index $p
+	'
 done
 
 for p in NA AA Z/NA Z/AA
 do
-    echo This is added $p in the branch B. >$p
-    test_expect_success \
-	'change in branch B (addition)' \
-	"git update-index --add $p"
+	echo This is added $p in the branch B. >$p
+	test_expect_success 'change in branch B (addition)' '
+		git update-index --add $p
+	'
 done
 echo This is SS from the modified tree. >SS
 echo This is LL from the modified tree. >LL
-test_expect_success \
-    'change in branch B (addition and modification)' \
-    'git update-index --add LL &&
-     git update-index SS'
+test_expect_success 'change in branch B (addition and modification)' '
+	git update-index --add LL &&
+	git update-index SS
+'
 mv TT TT-
 sed -e '/Branch B/s/word/WORD/g' <TT- >TT
 rm -f TT-
-test_expect_success \
-    'change in branch B (modification)' \
-    'git update-index TT'
+test_expect_success 'change in branch B (modification)' '
+	git update-index TT
+'
 
 echo Branch B makes a file at DF. >DF
-test_expect_success \
-    'change in branch B (addition of a file to conflict with directory)' \
-    'git update-index --add DF'
-
-test_expect_success \
-    'recording branch B tree' \
-    'tree_B=$(git write-tree)'
-
-test_expect_success \
-    'keep contents of 3 trees for easy access' \
-    'rm -f .git/index &&
-     git read-tree $tree_O &&
-     mkdir .orig-O &&
-     git checkout-index --prefix=.orig-O/ -f -q -a &&
-     rm -f .git/index &&
-     git read-tree $tree_A &&
-     mkdir .orig-A &&
-     git checkout-index --prefix=.orig-A/ -f -q -a &&
-     rm -f .git/index &&
-     git read-tree $tree_B &&
-     mkdir .orig-B &&
-     git checkout-index --prefix=.orig-B/ -f -q -a'
+test_expect_success 'change in branch B (addition of a file to conflict with directory)' '
+	git update-index --add DF
+'
+
+test_expect_success 'recording branch B tree' '
+	tree_B=$(git write-tree)
+'
+
+test_expect_success 'keep contents of 3 trees for easy access' '
+	rm -f .git/index &&
+	git read-tree $tree_O &&
+	mkdir .orig-O &&
+	git checkout-index --prefix=.orig-O/ -f -q -a &&
+	rm -f .git/index &&
+	git read-tree $tree_A &&
+	mkdir .orig-A &&
+	git checkout-index --prefix=.orig-A/ -f -q -a &&
+	rm -f .git/index &&
+	git read-tree $tree_B &&
+	mkdir .orig-B &&
+	git checkout-index --prefix=.orig-B/ -f -q -a
+'
diff --git a/t/lib-rebase.sh b/t/lib-rebase.sh
index b72c051..11d2dc9 100644
--- a/t/lib-rebase.sh
+++ b/t/lib-rebase.sh
@@ -4,20 +4,25 @@
 #
 # - override the commit message with $FAKE_COMMIT_MESSAGE
 # - amend the commit message with $FAKE_COMMIT_AMEND
+# - copy the original commit message to a file with $FAKE_MESSAGE_COPY
 # - check that non-commit messages have a certain line count with $EXPECT_COUNT
 # - check the commit count in the commit message header with $EXPECT_HEADER_COUNT
 # - rewrite a rebase -i script as directed by $FAKE_LINES.
-#   $FAKE_LINES consists of a sequence of words separated by spaces.
-#   The following word combinations are possible:
+#   $FAKE_LINES consists of a sequence of words separated by spaces;
+#   spaces inside the words are encoded as underscores.
+#   The following words are possible:
 #
-#   "<lineno>" -- add a "pick" line with the SHA1 taken from the
-#       specified line.
+#   "<cmd>" -- override the command for the next line specification. Can be
+#       "pick", "squash", "fixup[_-(c|C)]", "edit", "reword", "drop",
+#       "merge[_-(c|C)_<rev>]", or "bad" for an invalid command.
 #
-#   "<cmd> <lineno>" -- add a line with the specified command
-#       ("pick", "squash", "fixup", "edit", "reword" or "drop") and the
-#       SHA1 taken from the specified line.
+#   "<lineno>" -- add a command, using the specified line as a template.
+#       If the command has not been overridden, the line will be copied
+#       verbatim, usually resulting in a "pick" line.
 #
-#   "exec_cmd_with_args" -- add an "exec cmd with args" line.
+#   "fakesha" -- add a command ("pick" by default), using a fake SHA1.
+#
+#   "exec_[command...]", "break" -- add the specified command.
 #
 #   "#" -- Add a comment line.
 #
@@ -29,10 +34,10 @@ set_fake_editor () {
 	*/COMMIT_EDITMSG)
 		test -z "$EXPECT_HEADER_COUNT" ||
 			test "$EXPECT_HEADER_COUNT" = "$(sed -n '1s/^# This is a combination of \(.*\) commits\./\1/p' < "$1")" ||
-			test "# # GETTEXT POISON #" = "$(sed -n '1p' < "$1")" ||
 			exit
 		test -z "$FAKE_COMMIT_MESSAGE" || echo "$FAKE_COMMIT_MESSAGE" > "$1"
 		test -z "$FAKE_COMMIT_AMEND" || echo "$FAKE_COMMIT_AMEND" >> "$1"
+		test -z "$FAKE_MESSAGE_COPY" || cat "$1" >"$FAKE_MESSAGE_COPY"
 		exit
 		;;
 	esac
@@ -47,20 +52,22 @@ set_fake_editor () {
 	action=\&
 	for line in $FAKE_LINES; do
 		case $line in
-		pick|p|squash|s|fixup|f|edit|e|reword|r|drop|d|label|l|reset|r|merge|m)
+		pick|p|squash|s|fixup|f|edit|e|reword|r|drop|d|label|l|reset|t|merge|m)
 			action="$line";;
 		exec_*|x_*|break|b)
 			echo "$line" | sed 's/_/ /g' >> "$1";;
+		merge_*|fixup_*)
+			action=$(echo "$line" | sed 's/_/ /g');;
 		"#")
 			echo '# comment' >> "$1";;
 		">")
 			echo >> "$1";;
 		bad)
-			action="badcmd";;
+			action="pickled";;
 		fakesha)
 			test \& != "$action" || action=pick
 			echo "$action XXXXXXX False commit" >> "$1"
-			action=pick;;
+			action=\&;;
 		*)
 			sed -n "${line}s/^[a-z][a-z]*/$action/p" < "$1".tmp >> "$1"
 			action=\&;;
@@ -147,3 +154,78 @@ test_editor_unchanged () {
 	EOF
 	test_cmp expect actual
 }
+
+# Set up an editor for testing reword commands
+# Checks that there are no uncommitted changes when rewording and that the
+# todo-list is reread after each
+set_reword_editor () {
+	>reword-actual &&
+	>reword-oid &&
+
+	# Check rewording keeps the original authorship
+	GIT_AUTHOR_NAME="Reword Author"
+	GIT_AUTHOR_EMAIL="reword.author@example.com"
+	GIT_AUTHOR_DATE=@123456
+
+	write_script reword-sequence-editor.sh <<-\EOF &&
+	todo="$(cat "$1")" &&
+	echo "exec git log -1 --pretty=format:'%an <%ae> %at%n%B%n' \
+		>>reword-actual" >"$1" &&
+	printf "%s\n" "$todo" >>"$1"
+	EOF
+
+	write_script reword-editor.sh <<-EOF &&
+	# Save the oid of the first reworded commit so we can check rebase
+	# fast-forwards to it. Also check that we do not write .git/MERGE_MSG
+	# when fast-forwarding
+	if ! test -s reword-oid
+	then
+		git rev-parse HEAD >reword-oid &&
+		if test -f .git/MERGE_MSG
+		then
+			echo 1>&2 "error: .git/MERGE_MSG exists"
+			exit 1
+		fi
+	fi &&
+	# There should be no uncommited changes
+	git diff --exit-code HEAD &&
+	# The todo-list should be re-read after a reword
+	GIT_SEQUENCE_EDITOR="\"$PWD/reword-sequence-editor.sh\"" \
+		git rebase --edit-todo &&
+	echo edited >>"\$1"
+	EOF
+
+	test_set_editor "$PWD/reword-editor.sh"
+}
+
+# Check the results of a rebase after calling set_reword_editor
+# Pass the commits that were reworded in the order that they were picked
+# Expects the first pick to be a fast-forward
+check_reworded_commits () {
+	test_cmp_rev "$(cat reword-oid)" "$1^{commit}" &&
+	git log --format="%an <%ae> %at%n%B%nedited%n" --no-walk=unsorted "$@" \
+		>reword-expected &&
+	test_cmp reword-expected reword-actual &&
+	git log --format="%an <%ae> %at%n%B" -n $# --first-parent --reverse \
+		>reword-log &&
+	test_cmp reword-expected reword-log
+}
+
+# usage: set_replace_editor <file>
+#
+# Replace the todo file with the exact contents of the given file.
+# N.B. sets GIT_SEQUENCE_EDITOR rather than EDITOR so it can be
+# combined with set_fake_editor to reword commits and replace the
+# todo list
+set_replace_editor () {
+	cat >script <<-\EOF &&
+	cat FILENAME >"$1"
+
+	echo 'rebase -i script after editing:'
+	cat "$1"
+	EOF
+
+	sed -e "s/FILENAME/$1/g" script |
+		write_script fake-sequence-editor.sh &&
+	test_set_sequence_editor "$(pwd)/fake-sequence-editor.sh"
+}
diff --git a/t/lib-submodule-update.sh b/t/lib-submodule-update.sh
index 87a7591..36f767c 100644
--- a/t/lib-submodule-update.sh
+++ b/t/lib-submodule-update.sh
@@ -63,6 +63,7 @@ create_lib_submodule_repo () {
 	git init submodule_update_repo &&
 	(
 		cd submodule_update_repo &&
+		branch=$(git symbolic-ref --short HEAD) &&
 		echo "expect" >>.gitignore &&
 		echo "actual" >>.gitignore &&
 		echo "x" >file1 &&
@@ -144,7 +145,7 @@ create_lib_submodule_repo () {
 		git checkout -b valid_sub1 &&
 		git revert HEAD &&
 
-		git checkout master
+		git checkout "$branch"
 	)
 }
 
@@ -167,20 +168,16 @@ replace_gitfile_with_git_dir () {
 # Note that this only supports submodules at the root level of the
 # superproject, with the default name, i.e. same as its path.
 test_git_directory_is_unchanged () {
-	(
-		cd ".git/modules/$1" &&
-		# does core.worktree point at the right place?
-		test "$(git config core.worktree)" = "../../../$1" &&
-		# remove it temporarily before comparing, as
-		# "$1/.git/config" lacks it...
-		git config --unset core.worktree
-	) &&
+	# does core.worktree point at the right place?
+	echo "../../../$1" >expect &&
+	git -C ".git/modules/$1" config core.worktree >actual &&
+	test_cmp expect actual &&
+	# remove it temporarily before comparing, as
+	# "$1/.git/config" lacks it...
+	git -C ".git/modules/$1" config --unset core.worktree &&
 	diff -r ".git/modules/$1" "$1/.git" &&
-	(
-		# ... and then restore.
-		cd ".git/modules/$1" &&
-		git config core.worktree "../../../$1"
-	)
+	# ... and then restore.
+	git -C ".git/modules/$1" config core.worktree "../../../$1"
 }
 
 test_git_directory_exists () {
@@ -188,7 +185,9 @@ test_git_directory_exists () {
 	if test -f sub1/.git
 	then
 		# does core.worktree point at the right place?
-		test "$(git -C .git/modules/$1 config core.worktree)" = "../../../$1"
+		echo "../../../$1" >expect &&
+		git -C ".git/modules/$1" config core.worktree >actual &&
+		test_cmp expect actual
 	fi
 }
 
@@ -196,6 +195,7 @@ test_git_directory_exists () {
 # the submodule repo if it doesn't exist and configures the most problematic
 # settings for diff.ignoreSubmodules.
 prolog () {
+	test_config_global protocol.file.allow always &&
 	(test -d submodule_update_repo || create_lib_submodule_repo) &&
 	test_config_global diff.ignoreSubmodules all &&
 	test_config diff.ignoreSubmodules all
@@ -206,7 +206,7 @@ prolog () {
 # should be updated to an existing commit.
 reset_work_tree_to () {
 	rm -rf submodule_update &&
-	git clone submodule_update_repo submodule_update &&
+	git clone --template= submodule_update_repo submodule_update &&
 	(
 		cd submodule_update &&
 		rm -rf sub1 &&
@@ -316,14 +316,7 @@ test_submodule_switch_common () {
 	command="$1"
 	######################### Appearing submodule #########################
 	# Switching to a commit letting a submodule appear creates empty dir ...
-	if test "$KNOWN_FAILURE_STASH_DOES_IGNORE_SUBMODULE_CHANGES" = 1
-	then
-		# Restoring stash fails to restore submodule index entry
-		RESULT="failure"
-	else
-		RESULT="success"
-	fi
-	test_expect_$RESULT "$command: added submodule creates empty directory" '
+	test_expect_success "$command: added submodule creates empty directory" '
 		prolog &&
 		reset_work_tree_to no_submodule &&
 		(
@@ -337,6 +330,13 @@ test_submodule_switch_common () {
 		)
 	'
 	# ... and doesn't care if it already exists.
+	if test "$KNOWN_FAILURE_STASH_DOES_IGNORE_SUBMODULE_CHANGES" = 1
+	then
+		# Restoring stash fails to restore submodule index entry
+		RESULT="failure"
+	else
+		RESULT="success"
+	fi
 	test_expect_$RESULT "$command: added submodule leaves existing empty directory alone" '
 		prolog &&
 		reset_work_tree_to no_submodule &&
@@ -802,7 +802,7 @@ test_submodule_recursing_with_args_common () {
 			git branch -t no_submodule origin/no_submodule &&
 			$command no_submodule &&
 			test_superproject_content origin/no_submodule &&
-			! test_path_is_dir sub1 &&
+			test_path_is_missing sub1 &&
 			test_must_fail git config -f .git/modules/sub1/config core.worktree &&
 			test_must_fail git config -f .git/modules/sub1/modules/sub2/config core.worktree
 		)
@@ -830,7 +830,7 @@ test_submodule_recursing_with_args_common () {
 			cd submodule_update &&
 			git branch -t invalid_sub1 origin/invalid_sub1 &&
 			test_must_fail $command invalid_sub1 2>err &&
-			test_i18ngrep sub1 err &&
+			test_grep sub1 err &&
 			test_superproject_content origin/add_sub1 &&
 			test_submodule_content sub1 origin/add_sub1
 		)
@@ -901,13 +901,14 @@ test_submodule_switch_recursing_with_args () {
 	'
 	# ... but an ignored file is fine.
 	test_expect_$RESULTOI "$command: added submodule removes an untracked ignored file" '
-		test_when_finished "rm submodule_update/.git/info/exclude" &&
+		test_when_finished "rm -rf submodule_update/.git/info" &&
 		prolog &&
 		reset_work_tree_to_interested no_submodule &&
 		(
 			cd submodule_update &&
 			git branch -t add_sub1 origin/add_sub1 &&
 			: >sub1 &&
+			mkdir .git/info &&
 			echo sub1 >.git/info/exclude &&
 			$command add_sub1 &&
 			test_superproject_content origin/add_sub1 &&
@@ -950,7 +951,9 @@ test_submodule_switch_recursing_with_args () {
 		reset_work_tree_to_interested add_sub1 &&
 		(
 			cd submodule_update &&
+			rm -rf .git/modules/sub1/info &&
 			git branch -t replace_sub1_with_file origin/replace_sub1_with_file &&
+			mkdir .git/modules/sub1/info &&
 			echo ignored >.git/modules/sub1/info/exclude &&
 			: >sub1/ignored &&
 			$command replace_sub1_with_file &&
diff --git a/t/lib-subtest.sh b/t/lib-subtest.sh
new file mode 100644
index 0000000..56ee927
--- /dev/null
+++ b/t/lib-subtest.sh
@@ -0,0 +1,95 @@
+write_sub_test_lib_test () {
+	name="$1" # stdin is the body of the test code
+	mkdir "$name" &&
+	write_script "$name/$name.sh" "$TEST_SHELL_PATH" <<-EOF &&
+	test_description='A test of test-lib.sh itself'
+
+	# Point to the t/test-lib.sh, which isn't in ../ as usual
+	. "\$TEST_DIRECTORY"/test-lib.sh
+	EOF
+	cat >>"$name/$name.sh"
+}
+
+_run_sub_test_lib_test_common () {
+	cmp_op="$1" want_code="$2" name="$3" # stdin is the body of the test code
+	shift 3
+
+	# intercept pseudo-options at the front of the argument list that we
+	# will not pass to child script
+	skip=
+	while test $# -gt 0
+	do
+		case "$1" in
+		--skip=*)
+			skip=${1#--*=}
+			shift
+			;;
+		*)
+			break
+			;;
+		esac
+	done
+
+	(
+		cd "$name" &&
+
+		# Pretend we're not running under a test harness, whether we
+		# are or not. The test-lib output depends on the setting of
+		# this variable, so we need a stable setting under which to run
+		# the sub-test.
+		sane_unset HARNESS_ACTIVE &&
+
+		export TEST_DIRECTORY &&
+		# The child test re-sources GIT-BUILD-OPTIONS and may thus
+		# override the test output directory. We thus pass it as an
+		# explicit override to the child.
+		TEST_OUTPUT_DIRECTORY_OVERRIDE=$(pwd) &&
+		export TEST_OUTPUT_DIRECTORY_OVERRIDE &&
+		GIT_SKIP_TESTS=$skip &&
+		export GIT_SKIP_TESTS &&
+		sane_unset GIT_TEST_FAIL_PREREQS &&
+		./"$name.sh" "$@" >out 2>err;
+		ret=$? &&
+		test "$ret" "$cmp_op" "$want_code"
+	)
+}
+
+write_and_run_sub_test_lib_test () {
+	name="$1" descr="$2" # stdin is the body of the test code
+	write_sub_test_lib_test "$@" || return 1
+	_run_sub_test_lib_test_common -eq 0 "$@"
+}
+
+write_and_run_sub_test_lib_test_err () {
+	name="$1" descr="$2" # stdin is the body of the test code
+	write_sub_test_lib_test "$@" || return 1
+	_run_sub_test_lib_test_common -eq 1 "$@"
+}
+
+run_sub_test_lib_test () {
+	_run_sub_test_lib_test_common -eq 0 "$@"
+}
+
+run_sub_test_lib_test_err () {
+	_run_sub_test_lib_test_common -eq 1 "$@"
+}
+
+_check_sub_test_lib_test_common () {
+	name="$1" &&
+	sed -e 's/^> //' -e 's/Z$//' >"$name"/expect.out &&
+	test_cmp "$name"/expect.out "$name"/out
+}
+
+check_sub_test_lib_test () {
+	name="$1" # stdin is the expected output from the test
+	_check_sub_test_lib_test_common "$name" &&
+	test_must_be_empty "$name"/err
+}
+
+check_sub_test_lib_test_err () {
+	name="$1" # stdin is the expected output from the test
+	_check_sub_test_lib_test_common "$name" &&
+	# expected error output is in descriptor 3
+	sed -e 's/^> //' -e 's/Z$//' <&3 >"$name"/expect.err &&
+	test_cmp "$name"/expect.err "$name"/err
+}
diff --git a/t/lib-sudo.sh b/t/lib-sudo.sh
new file mode 100644
index 0000000..b4d7788
--- /dev/null
+++ b/t/lib-sudo.sh
@@ -0,0 +1,15 @@
+# Helpers for running git commands under sudo.
+
+# Runs a scriplet passed through stdin under sudo.
+run_with_sudo () {
+	local ret
+	local RUN="$TEST_DIRECTORY/$$.sh"
+	write_script "$RUN" "$TEST_SHELL_PATH"
+	# avoid calling "$RUN" directly so sudo doesn't get a chance to
+	# override the shell, add aditional restrictions or even reject
+	# running the script because its security policy deem it unsafe
+	sudo "$TEST_SHELL_PATH" -c "\"$RUN\""
+	ret=$?
+	rm -f "$RUN"
+	return $ret
+}
diff --git a/t/lib-t3100.sh b/t/lib-t3100.sh
new file mode 100644
index 0000000..eabb5fd
--- /dev/null
+++ b/t/lib-t3100.sh
@@ -0,0 +1,10 @@
+#!/bin/sh
+
+setup_basic_ls_tree_data () {
+	mkdir dir &&
+	test_commit dir/sub-file &&
+	test_commit top-file &&
+	git clone . submodule &&
+	git submodule add ./submodule &&
+	git commit -m"add submodule"
+}
diff --git a/t/lib-unicode-nfc-nfd.sh b/t/lib-unicode-nfc-nfd.sh
new file mode 100755
index 0000000..2223224
--- /dev/null
+++ b/t/lib-unicode-nfc-nfd.sh
@@ -0,0 +1,162 @@
+# Help detect how Unicode NFC and NFD are handled on the filesystem.
+
+# A simple character that has a NFD form.
+#
+# NFC:       U+00e9 LATIN SMALL LETTER E WITH ACUTE
+# UTF8(NFC): \xc3 \xa9
+#
+# NFD:       U+0065 LATIN SMALL LETTER E
+#            U+0301 COMBINING ACUTE ACCENT
+# UTF8(NFD): \x65  +  \xcc \x81
+#
+utf8_nfc=$(printf "\xc3\xa9")
+utf8_nfd=$(printf "\x65\xcc\x81")
+
+# Is the OS or the filesystem "Unicode composition sensitive"?
+#
+# That is, does the OS or the filesystem allow files to exist with
+# both the NFC and NFD spellings?  Or, does the OS/FS lie to us and
+# tell us that the NFC and NFD forms are equivalent.
+#
+# This is or may be independent of what type of filesystem we have,
+# since it might be handled by the OS at a layer above the FS.
+# Testing shows on MacOS using APFS, HFS+, and FAT32 reports a
+# collision, for example.
+#
+# This does not tell us how the Unicode pathname will be spelled
+# on disk, but rather only that the two spelling "collide".  We
+# will examine the actual on disk spelling in a later prereq.
+#
+test_lazy_prereq UNICODE_COMPOSITION_SENSITIVE '
+	mkdir trial_${utf8_nfc} &&
+	mkdir trial_${utf8_nfd}
+'
+
+# Is the spelling of an NFC pathname preserved on disk?
+#
+# On MacOS with HFS+ and FAT32, NFC paths are converted into NFD
+# and on APFS, NFC paths are preserved.  As we have established
+# above, this is independent of "composition sensitivity".
+#
+test_lazy_prereq UNICODE_NFC_PRESERVED '
+	mkdir c_${utf8_nfc} &&
+	ls | test-tool hexdump >dump &&
+	grep "63 5f c3 a9" dump
+'
+
+# Is the spelling of an NFD pathname preserved on disk?
+#
+test_lazy_prereq UNICODE_NFD_PRESERVED '
+	mkdir d_${utf8_nfd} &&
+	ls | test-tool hexdump >dump &&
+	grep "64 5f 65 cc 81" dump
+'
+
+# The following _DOUBLE_ forms are more for my curiosity,
+# but there may be quirks lurking when there are multiple
+# combining characters in non-canonical order.
+
+# Unicode also allows multiple combining characters
+# that can be decomposed in pieces.
+#
+# NFC:        U+1f67 GREEK SMALL LETTER OMEGA WITH DASIA AND PERISPOMENI
+# UTF8(NFC):  \xe1 \xbd \xa7
+#
+# NFD1:       U+1f61 GREEK SMALL LETTER OMEGA WITH DASIA
+#             U+0342 COMBINING GREEK PERISPOMENI
+# UTF8(NFD1): \xe1 \xbd \xa1  +  \xcd \x82
+#
+# But U+1f61 decomposes into
+# NFD2:       U+03c9 GREEK SMALL LETTER OMEGA
+#             U+0314 COMBINING REVERSED COMMA ABOVE
+# UTF8(NFD2): \xcf \x89  +  \xcc \x94
+#
+# Yielding:   \xcf \x89  +  \xcc \x94  +  \xcd \x82
+#
+# Note that I've used the canonical ordering of the
+# combinining characters.  It is also possible to
+# swap them.  My testing shows that that non-standard
+# ordering also causes a collision in mkdir.  However,
+# the resulting names don't draw correctly on the
+# terminal (implying that the on-disk format also has
+# them out of order).
+#
+greek_nfc=$(printf "\xe1\xbd\xa7")
+greek_nfd1=$(printf "\xe1\xbd\xa1\xcd\x82")
+greek_nfd2=$(printf "\xcf\x89\xcc\x94\xcd\x82")
+
+# See if a double decomposition also collides.
+#
+test_lazy_prereq UNICODE_DOUBLE_COMPOSITION_SENSITIVE '
+	mkdir trial_${greek_nfc} &&
+	mkdir trial_${greek_nfd2}
+'
+
+# See if the NFC spelling appears on the disk.
+#
+test_lazy_prereq UNICODE_DOUBLE_NFC_PRESERVED '
+	mkdir c_${greek_nfc} &&
+	ls | test-tool hexdump >dump &&
+	grep "63 5f e1 bd a7" dump
+'
+
+# See if the NFD spelling appears on the disk.
+#
+test_lazy_prereq UNICODE_DOUBLE_NFD_PRESERVED '
+	mkdir d_${greek_nfd2} &&
+	ls | test-tool hexdump >dump &&
+	grep "64 5f cf 89 cc 94 cd 82" dump
+'
+
+# The following is for debugging. I found it useful when
+# trying to understand the various (OS, FS) quirks WRT
+# Unicode and how composition/decomposition is handled.
+# For example, when trying to understand how (macOS, APFS)
+# and (macOS, HFS) and (macOS, FAT32) compare.
+#
+# It is rather noisy, so it is disabled by default.
+#
+if test "$unicode_debug" = "true"
+then
+	if test_have_prereq UNICODE_COMPOSITION_SENSITIVE
+	then
+		echo NFC and NFD are distinct on this OS/filesystem.
+	else
+		echo NFC and NFD are aliases on this OS/filesystem.
+	fi
+
+	if test_have_prereq UNICODE_NFC_PRESERVED
+	then
+		echo NFC maintains original spelling.
+	else
+		echo NFC is modified.
+	fi
+
+	if test_have_prereq UNICODE_NFD_PRESERVED
+	then
+		echo NFD maintains original spelling.
+	else
+		echo NFD is modified.
+	fi
+
+	if test_have_prereq UNICODE_DOUBLE_COMPOSITION_SENSITIVE
+	then
+		echo DOUBLE NFC and NFD are distinct on this OS/filesystem.
+	else
+		echo DOUBLE NFC and NFD are aliases on this OS/filesystem.
+	fi
+
+	if test_have_prereq UNICODE_DOUBLE_NFC_PRESERVED
+	then
+		echo Double NFC maintains original spelling.
+	else
+		echo Double NFC is modified.
+	fi
+
+	if test_have_prereq UNICODE_DOUBLE_NFD_PRESERVED
+	then
+		echo Double NFD maintains original spelling.
+	else
+		echo Double NFD is modified.
+	fi
+fi
diff --git a/t/lib-unique-files.sh b/t/lib-unique-files.sh
new file mode 100644
index 0000000..a14080f
--- /dev/null
+++ b/t/lib-unique-files.sh
@@ -0,0 +1,34 @@
+# Helper to create files with unique contents
+
+# Create multiple files with unique contents within this test run. Takes the
+# number of directories, the number of files in each directory, and the base
+# directory.
+#
+# test_create_unique_files 2 3 my_dir -- Creates 2 directories with 3 files
+#					 each in my_dir, all with contents
+#					 different from previous invocations
+#					 of this command in this run.
+
+test_create_unique_files () {
+	test "$#" -ne 3 && BUG "3 param"
+
+	local dirs="$1" &&
+	local files="$2" &&
+	local basedir="$3" &&
+	local counter="0" &&
+	local i &&
+	local j &&
+	test_tick &&
+	local basedata="$basedir$test_tick" &&
+	rm -rf "$basedir" &&
+	for i in $(test_seq $dirs)
+	do
+		local dir="$basedir/dir$i" &&
+		mkdir -p "$dir" &&
+		for j in $(test_seq $files)
+		do
+			counter=$((counter + 1)) &&
+			echo "$basedata.$counter">"$dir/file$j.txt"
+		done
+	done
+}
diff --git a/t/oid-info/README b/t/oid-info/README
index 27f843f..ca56a74 100644
--- a/t/oid-info/README
+++ b/t/oid-info/README
@@ -5,7 +5,7 @@ starting with `#` are ignored.  The key and value are separated by whitespace
 (specifically, those whitespace in the default `$IFS`).  The key consists only
 of shell identifier characters, and the value consists of a hash algorithm,
 colon, and value.  The hash algorithm also consists only of shell identifier
-characters; it should match the value in sha1-file.c.
+characters; it should match the value in object-file.c.
 
 For example, the following lines map the key "rawsz" to "20" if SHA-1 is in use
 and to "32" if SHA-256 is in use:
diff --git a/t/oid-info/hash-info b/t/oid-info/hash-info
index d0736dd..b8a5bcb 100644
--- a/t/oid-info/hash-info
+++ b/t/oid-info/hash-info
@@ -15,3 +15,15 @@ empty_blob sha256:473a0f4c3be8a93681a267e3b1e9a7dcda1185436fe141f7749120a3037218
 
 empty_tree sha1:4b825dc642cb6eb9a060e54bf8d69288fbee4904
 empty_tree sha256:6ef19b41225c5369f1c104d45d8d85efa9b057b53b14b4b9b939dd74decc5321
+
+blob17_1 sha1:263
+blob17_1 sha256:34
+
+blob17_2 sha1:410
+blob17_2 sha256:174
+
+blob17_3 sha1:523
+blob17_3 sha256:313
+
+blob17_4 sha1:790
+blob17_4 sha256:481
diff --git a/t/oid-info/oid b/t/oid-info/oid
index a754970..7547d2c 100644
--- a/t/oid-info/oid
+++ b/t/oid-info/oid
@@ -27,3 +27,5 @@ numeric		sha1:0123456789012345678901234567890123456789
 numeric		sha256:0123456789012345678901234567890123456789012345678901234567890123
 deadbeef	sha1:deadbeefdeadbeefdeadbeefdeadbeefdeadbeef
 deadbeef	sha256:deadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeef
+deadbeef_short	sha1:deadbeefdeadbeefdeadbeefdeadbeefdeadbee
+deadbeef_short	sha256:deadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbee
diff --git a/t/perf/.gitignore b/t/perf/.gitignore
index 982eb8e..72f5d0d 100644
--- a/t/perf/.gitignore
+++ b/t/perf/.gitignore
@@ -1,3 +1,4 @@
 /build/
 /test-results/
+/test-trace/
 /trash directory*/
diff --git a/t/perf/Makefile b/t/perf/Makefile
index 8c47155..e4808ae 100644
--- a/t/perf/Makefile
+++ b/t/perf/Makefile
@@ -1,15 +1,21 @@
+# Import tree-wide shared Makefile behavior and libraries
+include ../../shared.mak
+
 -include ../../config.mak
 export GIT_TEST_OPTIONS
 
-all: perf
+all: test-lint perf
 
 perf: pre-clean
 	./run
 
 pre-clean:
-	rm -rf test-results
+	rm -rf test-results test-trace
 
 clean:
-	rm -rf build "trash directory".* test-results
+	rm -rf build "trash directory".* test-results test-trace
+
+test-lint:
+	$(MAKE) -C .. test-lint
 
 .PHONY: all perf pre-clean clean
diff --git a/t/perf/README b/t/perf/README
index c7b70e2..8f217d7 100644
--- a/t/perf/README
+++ b/t/perf/README
@@ -28,6 +28,8 @@ the tests on the current git repository.
     7810.3: grep --cached, cheap regex       3.07(3.02+0.25)
     7810.4: grep --cached, expensive regex   9.39(30.57+0.24)
 
+Output format is in seconds "Elapsed(User + System)"
+
 You can compare multiple repositories and even git revisions with the
 'run' script:
 
@@ -84,6 +86,19 @@ You can set the following variables (also in your config.mak):
 	probably be about linux.git size for optimal results.
 	Both default to the git.git you are running from.
 
+    GIT_PERF_EXTRA
+	Boolean to enable additional tests. Most test scripts are
+	written to detect regressions between two versions of Git, and
+	the output will compare timings for individual tests between
+	those versions. Some scripts have additional tests which are not
+	run by default, that show patterns within a single version of
+	Git (e.g., performance of index-pack as the number of threads
+	changes). These can be enabled with GIT_PERF_EXTRA.
+
+    GIT_PERF_USE_SCALAR
+	Boolean indicating whether to register test repo(s) with Scalar
+	before executing tests.
+
 You can also pass the options taken by ordinary git tests; the most
 useful one is:
 
diff --git a/t/perf/aggregate.perl b/t/perf/aggregate.perl
index 14e4cda..575d200 100755
--- a/t/perf/aggregate.perl
+++ b/t/perf/aggregate.perl
@@ -17,8 +17,8 @@ sub get_times {
 		my $rt = ((defined $1 ? $1 : 0.0)*60+$2)*60+$3;
 		return ($rt, $4, $5);
 	# size
-	} elsif ($line =~ /^\d+$/) {
-		return $&;
+	} elsif ($line =~ /^\s*(\d+)$/) {
+		return $1;
 	} else {
 		die "bad input line: $line";
 	}
@@ -58,6 +58,7 @@ sub usage {
   Options:
     --codespeed          * Format output for Codespeed
     --reponame    <str>  * Send given reponame to codespeed
+    --results-dir <str>  * Directory where test results are located
     --sort-by     <str>  * Sort output (only "regression" criteria is supported)
     --subsection  <str>  * Use results from given subsection
 
@@ -91,11 +92,13 @@ sub sane_backticks {
 
 my (@dirs, %dirnames, %dirabbrevs, %prefixes, @tests,
     $codespeed, $sortby, $subsection, $reponame);
+my $resultsdir = "test-results";
 
 Getopt::Long::Configure qw/ require_order /;
 
 my $rc = GetOptions("codespeed"     => \$codespeed,
 		    "reponame=s"    => \$reponame,
+		    "results-dir=s" => \$resultsdir,
 		    "sort-by=s"     => \$sortby,
 		    "subsection=s"  => \$subsection);
 usage() unless $rc;
@@ -137,8 +140,6 @@ if (not @tests) {
 	@tests = glob "p????-*.sh";
 }
 
-my $resultsdir = "test-results";
-
 if (! $subsection and
     exists $ENV{GIT_PERF_SUBSECTION} and
     $ENV{GIT_PERF_SUBSECTION} ne "") {
diff --git a/t/perf/config b/t/perf/config
new file mode 100644
index 0000000..b92768b
--- /dev/null
+++ b/t/perf/config
@@ -0,0 +1,2 @@
+[gc]
+	auto = 0
diff --git a/t/perf/lib-bitmap.sh b/t/perf/lib-bitmap.sh
new file mode 100644
index 0000000..55a8feb
--- /dev/null
+++ b/t/perf/lib-bitmap.sh
@@ -0,0 +1,100 @@
+# Helper functions for testing bitmap performance; see p5310.
+
+test_full_bitmap () {
+	test_perf 'simulated clone' '
+		git pack-objects --stdout --all </dev/null >/dev/null
+	'
+
+	test_perf 'simulated fetch' '
+		have=$(git rev-list HEAD~100 -1) &&
+		{
+			echo HEAD &&
+			echo ^$have
+		} | git pack-objects --revs --stdout >/dev/null
+	'
+
+	test_perf 'pack to file (bitmap)' '
+		git pack-objects --use-bitmap-index --all pack1b </dev/null >/dev/null
+	'
+
+	test_perf 'rev-list (commits)' '
+		git rev-list --all --use-bitmap-index >/dev/null
+	'
+
+	test_perf 'rev-list (objects)' '
+		git rev-list --all --use-bitmap-index --objects >/dev/null
+	'
+
+	test_perf 'rev-list with tag negated via --not --all (objects)' '
+		git rev-list perf-tag --not --all --use-bitmap-index --objects >/dev/null
+	'
+
+	test_perf 'rev-list with negative tag (objects)' '
+		git rev-list HEAD --not perf-tag --use-bitmap-index --objects >/dev/null
+	'
+
+	test_perf 'rev-list count with blob:none' '
+		git rev-list --use-bitmap-index --count --objects --all \
+			--filter=blob:none >/dev/null
+	'
+
+	test_perf 'rev-list count with blob:limit=1k' '
+		git rev-list --use-bitmap-index --count --objects --all \
+			--filter=blob:limit=1k >/dev/null
+	'
+
+	test_perf 'rev-list count with tree:0' '
+		git rev-list --use-bitmap-index --count --objects --all \
+			--filter=tree:0 >/dev/null
+	'
+
+	test_perf 'simulated partial clone' '
+		git pack-objects --stdout --all --filter=blob:none </dev/null >/dev/null
+	'
+}
+
+test_partial_bitmap () {
+	test_perf 'clone (partial bitmap)' '
+		git pack-objects --stdout --all </dev/null >/dev/null
+	'
+
+	test_perf 'pack to file (partial bitmap)' '
+		git pack-objects --use-bitmap-index --all pack2b </dev/null >/dev/null
+	'
+
+	test_perf 'rev-list with tree filter (partial bitmap)' '
+		git rev-list --use-bitmap-index --count --objects --all \
+			--filter=tree:0 >/dev/null
+	'
+}
+
+test_pack_bitmap () {
+	test_perf "repack to disk" '
+		git repack -ad
+	'
+
+	test_full_bitmap
+
+	test_expect_success "create partial bitmap state" '
+		# pick a commit to represent the repo tip in the past
+		cutoff=$(git rev-list HEAD~100 -1) &&
+		orig_tip=$(git rev-parse HEAD) &&
+
+		# now kill off all of the refs and pretend we had
+		# just the one tip
+		rm -rf .git/logs .git/refs/* .git/packed-refs &&
+		git update-ref HEAD $cutoff &&
+
+		# and then repack, which will leave us with a nice
+		# big bitmap pack of the "old" history, and all of
+		# the new history will be loose, as if it had been pushed
+		# up incrementally and exploded via unpack-objects
+		git repack -Ad &&
+
+		# and now restore our original tip, as if the pushes
+		# had happened
+		git update-ref HEAD $orig_tip
+	'
+
+	test_partial_bitmap
+}
diff --git a/t/perf/p0004-lazy-init-name-hash.sh b/t/perf/p0004-lazy-init-name-hash.sh
index 1afc08f..85be14e 100755
--- a/t/perf/p0004-lazy-init-name-hash.sh
+++ b/t/perf/p0004-lazy-init-name-hash.sh
@@ -49,7 +49,7 @@ test_perf "single-threaded, $desc" "
 	test-tool lazy-init-name-hash --single --count=$count
 "
 
-test_perf REPO_BIG_ENOUGH_FOR_MULTI "multi-threaded, $desc" "
+test_perf "multi-threaded, $desc" --prereq REPO_BIG_ENOUGH_FOR_MULTI "
 	test-tool lazy-init-name-hash --multi --count=$count
 "
 
diff --git a/t/perf/p0005-status.sh b/t/perf/p0005-status.sh
index 0b0aa98..ca58d6c 100755
--- a/t/perf/p0005-status.sh
+++ b/t/perf/p0005-status.sh
@@ -24,17 +24,17 @@ test_perf_default_repo
 test_expect_success "setup repo" '
 	if git rev-parse --verify refs/heads/p0006-ballast^{commit}
 	then
-		echo Assuming synthetic repo from many-files.sh
-		git branch br_base            master
-		git branch br_ballast         p0006-ballast
-		git config --local core.sparsecheckout 1
+		echo Assuming synthetic repo from many-files.sh &&
+		git branch br_base            master &&
+		git branch br_ballast         p0006-ballast &&
+		git config --local core.sparsecheckout 1 &&
 		cat >.git/info/sparse-checkout <<-EOF
 		/*
 		!ballast/*
 		EOF
 	else
-		echo Assuming non-synthetic repo...
-		git branch br_base            $(git rev-list HEAD | tail -n 1)
+		echo Assuming non-synthetic repo... &&
+		git branch br_base            $(git rev-list HEAD | tail -n 1) &&
 		git branch br_ballast         HEAD
 	fi &&
 	git checkout -q br_ballast &&
diff --git a/t/perf/p0006-read-tree-checkout.sh b/t/perf/p0006-read-tree-checkout.sh
index 78cc23f..325566e 100755
--- a/t/perf/p0006-read-tree-checkout.sh
+++ b/t/perf/p0006-read-tree-checkout.sh
@@ -24,21 +24,21 @@ test_perf_default_repo
 test_expect_success "setup repo" '
 	if git rev-parse --verify refs/heads/p0006-ballast^{commit}
 	then
-		echo Assuming synthetic repo from many-files.sh
-		git branch br_base            master
-		git branch br_ballast         p0006-ballast^
-		git branch br_ballast_alias   p0006-ballast^
-		git branch br_ballast_plus_1  p0006-ballast
-		git config --local core.sparsecheckout 1
+		echo Assuming synthetic repo from many-files.sh &&
+		git branch br_base            master &&
+		git branch br_ballast         p0006-ballast^ &&
+		git branch br_ballast_alias   p0006-ballast^ &&
+		git branch br_ballast_plus_1  p0006-ballast &&
+		git config --local core.sparsecheckout 1 &&
 		cat >.git/info/sparse-checkout <<-EOF
 		/*
 		!ballast/*
 		EOF
 	else
-		echo Assuming non-synthetic repo...
-		git branch br_base            $(git rev-list HEAD | tail -n 1)
-		git branch br_ballast         HEAD^ || error "no ancestor commit from current head"
-		git branch br_ballast_alias   HEAD^
+		echo Assuming non-synthetic repo... &&
+		git branch br_base            $(git rev-list HEAD | tail -n 1) &&
+		git branch br_ballast         HEAD^ || error "no ancestor commit from current head" &&
+		git branch br_ballast_alias   HEAD^ &&
 		git branch br_ballast_plus_1  HEAD
 	fi &&
 	git checkout -q br_ballast &&
@@ -46,7 +46,15 @@ test_expect_success "setup repo" '
 '
 
 test_perf "read-tree br_base br_ballast ($nr_files)" '
-	git read-tree -m br_base br_ballast -n
+	git read-tree -n -m br_base br_ballast
+'
+
+test_perf "read-tree br_ballast_plus_1 ($nr_files)" '
+	# Run read-tree 100 times for clearer performance results & comparisons
+	for i in  $(test_seq 100)
+	do
+		git read-tree -n -m br_ballast_plus_1 || return 1
+	done
 '
 
 test_perf "switch between br_base br_ballast ($nr_files)" '
diff --git a/t/perf/p0007-write-cache.sh b/t/perf/p0007-write-cache.sh
index 0959526..25d8ff7 100755
--- a/t/perf/p0007-write-cache.sh
+++ b/t/perf/p0007-write-cache.sh
@@ -9,8 +9,8 @@ test_perf_default_repo
 test_expect_success "setup repo" '
 	if git rev-parse --verify refs/heads/p0006-ballast^{commit}
 	then
-		echo Assuming synthetic repo from many-files.sh
-		git config --local core.sparsecheckout 1
+		echo Assuming synthetic repo from many-files.sh &&
+		git config --local core.sparsecheckout 1 &&
 		cat >.git/info/sparse-checkout <<-EOF
 		/*
 		!ballast/*
diff --git a/t/perf/p0008-odb-fsync.sh b/t/perf/p0008-odb-fsync.sh
new file mode 100755
index 0000000..b3a90f3
--- /dev/null
+++ b/t/perf/p0008-odb-fsync.sh
@@ -0,0 +1,82 @@
+#!/bin/sh
+#
+# This test measures the performance of adding new files to the object
+# database. The test was originally added to measure the effect of the
+# core.fsyncMethod=batch mode, which is why we are testing different values of
+# that setting explicitly and creating a lot of unique objects.
+
+test_description="Tests performance of adding things to the object database"
+
+. ./perf-lib.sh
+
+. $TEST_DIRECTORY/lib-unique-files.sh
+
+test_perf_fresh_repo
+test_checkout_worktree
+
+dir_count=10
+files_per_dir=50
+total_files=$((dir_count * files_per_dir))
+
+populate_files () {
+	test_create_unique_files $dir_count $files_per_dir files
+}
+
+setup_repo () {
+	(rm -rf .git || 1) &&
+	git init &&
+	test_commit first &&
+	populate_files
+}
+
+test_perf_fsync_cfgs () {
+	local method &&
+	local cfg &&
+	for method in none fsync batch writeout-only
+	do
+		case $method in
+		none)
+			cfg="-c core.fsync=none"
+			;;
+		*)
+			cfg="-c core.fsync=loose-object -c core.fsyncMethod=$method"
+		esac &&
+
+		# Set GIT_TEST_FSYNC=1 explicitly since fsync is normally
+		# disabled by t/test-lib.sh.
+		if ! test_perf "$1 (fsyncMethod=$method)" \
+						--setup "$2" \
+						"GIT_TEST_FSYNC=1 git $cfg $3"
+		then
+			break
+		fi
+	done
+}
+
+test_perf_fsync_cfgs "add $total_files files" \
+	"setup_repo" \
+	"add -- files"
+
+test_perf_fsync_cfgs "stash $total_files files" \
+	"setup_repo" \
+	"stash push -u -- files"
+
+test_perf_fsync_cfgs "unpack $total_files files" \
+	"
+	setup_repo &&
+	git -c core.fsync=none add -- files &&
+	git -c core.fsync=none commit -q -m second &&
+	echo HEAD | git pack-objects -q --stdout --revs >test_pack.pack &&
+	setup_repo
+	" \
+	"unpack-objects -q <test_pack.pack"
+
+test_perf_fsync_cfgs "commit $total_files files" \
+	"
+	setup_repo &&
+	git -c core.fsync=none add -- files &&
+	populate_files
+	" \
+	"commit -q -a -m test"
+
+test_done
diff --git a/t/perf/p0071-sort.sh b/t/perf/p0071-sort.sh
index 6e924f5..ae4ddac 100755
--- a/t/perf/p0071-sort.sh
+++ b/t/perf/p0071-sort.sh
@@ -11,16 +11,42 @@ test_expect_success 'setup' '
 	git cat-file --batch >unsorted
 '
 
-test_perf 'sort(1)' '
-	sort <unsorted >expect
+test_perf 'sort(1) unsorted' '
+	sort <unsorted >sorted
 '
 
-test_perf 'string_list_sort()' '
-	test-tool string-list sort <unsorted >actual
+test_expect_success 'reverse' '
+	sort -r <unsorted >reversed
 '
 
-test_expect_success 'string_list_sort() sorts like sort(1)' '
-	test_cmp_bin expect actual
-'
+for file in sorted reversed
+do
+	test_perf "sort(1) $file" "
+		sort <$file >actual
+	"
+done
+
+for file in unsorted sorted reversed
+do
+
+	test_perf "string_list_sort() $file" "
+		test-tool string-list sort <$file >actual
+	"
+
+	test_expect_success "string_list_sort() $file sorts like sort(1)" "
+		test_cmp_bin sorted actual
+	"
+done
+
+for file in unsorted sorted reversed
+do
+	test_perf "DEFINE_LIST_SORT $file" "
+		test-tool mergesort sort <$file >actual
+	"
+
+	test_expect_success "DEFINE_LIST_SORT $file sorts like sort(1)" "
+		test_cmp_bin sorted actual
+	"
+done
 
 test_done
diff --git a/t/perf/p0090-cache-tree.sh b/t/perf/p0090-cache-tree.sh
new file mode 100755
index 0000000..a8eabca
--- /dev/null
+++ b/t/perf/p0090-cache-tree.sh
@@ -0,0 +1,36 @@
+#!/bin/sh
+
+test_description="Tests performance of cache tree update operations"
+
+. ./perf-lib.sh
+
+test_perf_large_repo
+test_checkout_worktree
+
+count=100
+
+test_expect_success 'setup cache tree' '
+	git write-tree
+'
+
+test_cache_tree () {
+	test_perf "$1, $3" "
+		for i in \$(test_seq $count)
+		do
+			test-tool cache-tree $4 $2
+		done
+	"
+}
+
+test_cache_tree_update_functions () {
+	test_cache_tree 'no-op' 'control' "$1" "$2"
+	test_cache_tree 'prime_cache_tree' 'prime' "$1" "$2"
+	test_cache_tree 'cache_tree_update' 'update' "$1" "$2"
+}
+
+test_cache_tree_update_functions "clean" ""
+test_cache_tree_update_functions "invalidate 2" "--invalidate 2"
+test_cache_tree_update_functions "invalidate 50" "--invalidate 50"
+test_cache_tree_update_functions "empty" "--empty"
+
+test_done
diff --git a/t/perf/p0100-globbing.sh b/t/perf/p0100-globbing.sh
index dd18a9c..439e9c8 100755
--- a/t/perf/p0100-globbing.sh
+++ b/t/perf/p0100-globbing.sh
@@ -19,9 +19,9 @@ test_expect_success 'setup' '
 		printf "a" >>refname &&
 		for j in $(test_seq 1 $i)
 		do
-			printf "a*" >>refglob.$i
+			printf "a*" >>refglob.$i || return 1
 		done &&
-		echo b >>refglob.$i
+		echo b >>refglob.$i || return 1
 	done &&
 	test_commit test $(cat refname).t "" $(cat refname).t
 '
diff --git a/t/perf/p1006-cat-file.sh b/t/perf/p1006-cat-file.sh
new file mode 100755
index 0000000..dcd8015
--- /dev/null
+++ b/t/perf/p1006-cat-file.sh
@@ -0,0 +1,12 @@
+#!/bin/sh
+
+test_description='Tests listing object info performance'
+. ./perf-lib.sh
+
+test_perf_large_repo
+
+test_perf 'cat-file --batch-check' '
+	git cat-file --batch-all-objects --batch-check
+'
+
+test_done
diff --git a/t/perf/p1400-update-ref.sh b/t/perf/p1400-update-ref.sh
index d275a81..a75969c 100755
--- a/t/perf/p1400-update-ref.sh
+++ b/t/perf/p1400-update-ref.sh
@@ -9,9 +9,12 @@ test_perf_fresh_repo
 test_expect_success "setup" '
 	test_commit PRE &&
 	test_commit POST &&
-	printf "create refs/heads/%d PRE\n" $(test_seq 1000) >create &&
-	printf "update refs/heads/%d POST PRE\n" $(test_seq 1000) >update &&
-	printf "delete refs/heads/%d POST\n" $(test_seq 1000) >delete
+	for i in $(test_seq 5000)
+	do
+		printf "start\ncreate refs/heads/%d PRE\ncommit\n" $i &&
+		printf "start\nupdate refs/heads/%d POST PRE\ncommit\n" $i &&
+		printf "start\ndelete refs/heads/%d POST\ncommit\n" $i || return 1
+	done >instructions
 '
 
 test_perf "update-ref" '
@@ -19,14 +22,12 @@ test_perf "update-ref" '
 	do
 		git update-ref refs/heads/branch PRE &&
 		git update-ref refs/heads/branch POST PRE &&
-		git update-ref -d refs/heads/branch
+		git update-ref -d refs/heads/branch || return 1
 	done
 '
 
 test_perf "update-ref --stdin" '
-	git update-ref --stdin <create &&
-	git update-ref --stdin <update &&
-	git update-ref --stdin <delete
+	git update-ref --stdin <instructions >/dev/null
 '
 
 test_done
diff --git a/t/perf/p1451-fsck-skip-list.sh b/t/perf/p1451-fsck-skip-list.sh
index c2b97d2..f767d83 100755
--- a/t/perf/p1451-fsck-skip-list.sh
+++ b/t/perf/p1451-fsck-skip-list.sh
@@ -15,7 +15,7 @@ test_expect_success "setup $n bad commits" '
 		echo "committer C <c@example.com> 1234567890 +0000" &&
 		echo "data <<EOF" &&
 		echo "$i.Q." &&
-		echo "EOF"
+		echo "EOF" || return 1
 	done | q_to_nul | git fast-import
 '
 
diff --git a/t/perf/p1500-graph-walks.sh b/t/perf/p1500-graph-walks.sh
new file mode 100755
index 0000000..e14e762
--- /dev/null
+++ b/t/perf/p1500-graph-walks.sh
@@ -0,0 +1,50 @@
+#!/bin/sh
+
+test_description='Commit walk performance tests'
+. ./perf-lib.sh
+
+test_perf_large_repo
+
+test_expect_success 'setup' '
+	git for-each-ref --format="%(refname)" "refs/heads/*" "refs/tags/*" >allrefs &&
+	sort -r allrefs | head -n 50 >refs &&
+	for ref in $(cat refs)
+	do
+		git branch -f ref-$ref $ref &&
+		echo ref-$ref ||
+		return 1
+	done >branches &&
+	for ref in $(cat refs)
+	do
+		git tag -f tag-$ref $ref &&
+		echo tag-$ref ||
+		return 1
+	done >tags &&
+	git commit-graph write --reachable
+'
+
+test_perf 'ahead-behind counts: git for-each-ref' '
+	git for-each-ref --format="%(ahead-behind:HEAD)" --stdin <refs
+'
+
+test_perf 'ahead-behind counts: git branch' '
+	xargs git branch -l --format="%(ahead-behind:HEAD)" <branches
+'
+
+test_perf 'ahead-behind counts: git tag' '
+	xargs git tag -l --format="%(ahead-behind:HEAD)" <tags
+'
+
+test_perf 'contains: git for-each-ref --merged' '
+	git for-each-ref --merged=HEAD --stdin <refs
+'
+
+test_perf 'contains: git branch --merged' '
+	xargs git branch --merged=HEAD <branches
+'
+
+test_perf 'contains: git tag --merged' '
+	xargs git tag --merged=HEAD <tags
+'
+
+test_done
diff --git a/t/perf/p2000-sparse-operations.sh b/t/perf/p2000-sparse-operations.sh
new file mode 100755
index 0000000..39e92b0
--- /dev/null
+++ b/t/perf/p2000-sparse-operations.sh
@@ -0,0 +1,139 @@
+#!/bin/sh
+
+test_description="test performance of Git operations using the index"
+
+. ./perf-lib.sh
+
+test_perf_default_repo
+
+SPARSE_CONE=f2/f4
+
+test_expect_success 'setup repo and indexes' '
+	git reset --hard HEAD &&
+
+	# Remove submodules from the example repo, because our
+	# duplication of the entire repo creates an unlikely data shape.
+	if git config --file .gitmodules --get-regexp "submodule.*.path" >modules
+	then
+		git rm $(awk "{print \$2}" modules) &&
+		git commit -m "remove submodules" || return 1
+	fi &&
+
+	echo bogus >a &&
+	cp a b &&
+	git add a b &&
+	git commit -m "level 0" &&
+	BLOB=$(git rev-parse HEAD:a) &&
+	OLD_COMMIT=$(git rev-parse HEAD) &&
+	OLD_TREE=$(git rev-parse HEAD^{tree}) &&
+
+	for i in $(test_seq 1 3)
+	do
+		cat >in <<-EOF &&
+			100755 blob $BLOB	a
+			040000 tree $OLD_TREE	f1
+			040000 tree $OLD_TREE	f2
+			040000 tree $OLD_TREE	f3
+			040000 tree $OLD_TREE	f4
+		EOF
+		NEW_TREE=$(git mktree <in) &&
+		NEW_COMMIT=$(git commit-tree $NEW_TREE -p $OLD_COMMIT -m "level $i") &&
+		OLD_TREE=$NEW_TREE &&
+		OLD_COMMIT=$NEW_COMMIT || return 1
+	done &&
+
+	git sparse-checkout init --cone &&
+	git tag -a v1.0 -m "Final" &&
+	git sparse-checkout set $SPARSE_CONE &&
+	git checkout -b wide $OLD_COMMIT &&
+
+	for l2 in f1 f2 f3 f4
+	do
+		echo more bogus >>$SPARSE_CONE/$l2/a &&
+		git commit -a -m "edit $SPARSE_CONE/$l2/a" || return 1
+	done &&
+
+	git -c core.sparseCheckoutCone=true clone --branch=wide --sparse . full-v3 &&
+	(
+		cd full-v3 &&
+		git sparse-checkout init --cone &&
+		git sparse-checkout set $SPARSE_CONE &&
+		git config index.version 3 &&
+		git update-index --index-version=3 &&
+		git checkout HEAD~4
+	) &&
+	git -c core.sparseCheckoutCone=true clone --branch=wide --sparse . full-v4 &&
+	(
+		cd full-v4 &&
+		git sparse-checkout init --cone &&
+		git sparse-checkout set $SPARSE_CONE &&
+		git config index.version 4 &&
+		git update-index --index-version=4 &&
+		git checkout HEAD~4
+	) &&
+	git -c core.sparseCheckoutCone=true clone --branch=wide --sparse . sparse-v3 &&
+	(
+		cd sparse-v3 &&
+		git sparse-checkout init --cone --sparse-index &&
+		git sparse-checkout set $SPARSE_CONE &&
+		git config index.version 3 &&
+		git update-index --index-version=3 &&
+		git checkout HEAD~4
+	) &&
+	git -c core.sparseCheckoutCone=true clone --branch=wide --sparse . sparse-v4 &&
+	(
+		cd sparse-v4 &&
+		git sparse-checkout init --cone --sparse-index &&
+		git sparse-checkout set $SPARSE_CONE &&
+		git config index.version 4 &&
+		git update-index --index-version=4 &&
+		git checkout HEAD~4
+	)
+'
+
+test_perf_on_all () {
+	command="$@"
+	for repo in full-v3 full-v4 \
+		    sparse-v3 sparse-v4
+	do
+		test_perf "$command ($repo)" "
+			(
+				cd $repo &&
+				echo >>$SPARSE_CONE/a &&
+				$command
+			)
+		"
+	done
+}
+
+test_perf_on_all git status
+test_perf_on_all 'git stash && git stash pop'
+test_perf_on_all 'echo >>new && git stash -u && git stash pop'
+test_perf_on_all git add -A
+test_perf_on_all git add .
+test_perf_on_all git commit -a -m A
+test_perf_on_all git checkout -f -
+test_perf_on_all "git sparse-checkout add f2/f3/f1 && git sparse-checkout set $SPARSE_CONE"
+test_perf_on_all git reset
+test_perf_on_all git reset --hard
+test_perf_on_all git reset -- does-not-exist
+test_perf_on_all git diff
+test_perf_on_all git diff --cached
+test_perf_on_all git blame $SPARSE_CONE/a
+test_perf_on_all git blame $SPARSE_CONE/f3/a
+test_perf_on_all git read-tree -mu HEAD
+test_perf_on_all git checkout-index -f --all
+test_perf_on_all git update-index --add --remove $SPARSE_CONE/a
+test_perf_on_all "git rm -f $SPARSE_CONE/a && git checkout HEAD -- $SPARSE_CONE/a"
+test_perf_on_all git grep --cached bogus -- "f2/f1/f1/*"
+test_perf_on_all git write-tree
+test_perf_on_all git describe --dirty
+test_perf_on_all 'echo >>new && git describe --dirty'
+test_perf_on_all git diff-files
+test_perf_on_all git diff-files -- $SPARSE_CONE/a
+test_perf_on_all git diff-tree HEAD
+test_perf_on_all git diff-tree HEAD -- $SPARSE_CONE/a
+test_perf_on_all "git worktree add ../temp && git worktree remove ../temp"
+test_perf_on_all git check-attr -a -- $SPARSE_CONE/a
+
+test_done
diff --git a/t/perf/p3400-rebase.sh b/t/perf/p3400-rebase.sh
index d202aae..e6b0277 100755
--- a/t/perf/p3400-rebase.sh
+++ b/t/perf/p3400-rebase.sh
@@ -9,20 +9,20 @@ test_expect_success 'setup rebasing on top of a lot of changes' '
 	git checkout -f -B base &&
 	git checkout -B to-rebase &&
 	git checkout -B upstream &&
-	for i in $(seq 100)
+	for i in $(test_seq 100)
 	do
 		# simulate huge diffs
 		echo change$i >unrelated-file$i &&
-		seq 1000 >>unrelated-file$i &&
+		test_seq 1000 >>unrelated-file$i &&
 		git add unrelated-file$i &&
 		test_tick &&
 		git commit -m commit$i unrelated-file$i &&
 		echo change$i >unrelated-file$i &&
-		seq 1000 | tac >>unrelated-file$i &&
+		test_seq 1000 | sort -nr >>unrelated-file$i &&
 		git add unrelated-file$i &&
 		test_tick &&
 		git commit -m commit$i-reverse unrelated-file$i ||
-		break
+		return 1
 	done &&
 	git checkout to-rebase &&
 	test_commit our-patch interesting-file
diff --git a/t/perf/p4002-diff-color-moved.sh b/t/perf/p4002-diff-color-moved.sh
new file mode 100755
index 0000000..ab2af93
--- /dev/null
+++ b/t/perf/p4002-diff-color-moved.sh
@@ -0,0 +1,57 @@
+#!/bin/sh
+
+test_description='Tests diff --color-moved performance'
+. ./perf-lib.sh
+
+test_perf_default_repo
+
+# The endpoints of the diff can be customized by setting TEST_REV_A
+# and TEST_REV_B in the environment when running this test.
+
+rev="${TEST_REV_A:-v2.28.0}"
+if ! rev_a="$(git rev-parse --quiet --verify "$rev")"
+then
+	skip_all="skipping because '$rev' was not found. \
+		  Use TEST_REV_A and TEST_REV_B to set the revs to use"
+	test_done
+fi
+rev="${TEST_REV_B:-v2.29.0}"
+if ! rev_b="$(git rev-parse --quiet --verify "$rev")"
+then
+	skip_all="skipping because '$rev' was not found. \
+		  Use TEST_REV_A and TEST_REV_B to set the revs to use"
+	test_done
+fi
+
+GIT_PAGER_IN_USE=1
+test_export GIT_PAGER_IN_USE rev_a rev_b
+
+test_perf 'diff --no-color-moved --no-color-moved-ws large change' '
+	git diff --no-color-moved --no-color-moved-ws $rev_a $rev_b
+'
+
+test_perf 'diff --color-moved --no-color-moved-ws large change' '
+	git diff --color-moved=zebra --no-color-moved-ws $rev_a $rev_b
+'
+
+test_perf 'diff --color-moved-ws=allow-indentation-change large change' '
+	git diff --color-moved=zebra --color-moved-ws=allow-indentation-change \
+		$rev_a $rev_b
+'
+
+test_perf 'log --no-color-moved --no-color-moved-ws' '
+	git log --no-color-moved --no-color-moved-ws --no-merges --patch \
+		-n1000 $rev_b
+'
+
+test_perf 'log --color-moved --no-color-moved-ws' '
+	git log --color-moved=zebra --no-color-moved-ws --no-merges --patch \
+		-n1000 $rev_b
+'
+
+test_perf 'log --color-moved-ws=allow-indentation-change' '
+	git log --color-moved=zebra --color-moved-ws=allow-indentation-change \
+		--no-merges --patch -n1000 $rev_b
+'
+
+test_done
diff --git a/t/perf/p4205-log-pretty-formats.sh b/t/perf/p4205-log-pretty-formats.sh
index 7c26f4f..609fecd 100755
--- a/t/perf/p4205-log-pretty-formats.sh
+++ b/t/perf/p4205-log-pretty-formats.sh
@@ -6,7 +6,7 @@ test_description='Tests the performance of various pretty format placeholders'
 
 test_perf_default_repo
 
-for format in %H %h %T %t %P %p %h-%h-%h
+for format in %H %h %T %t %P %p %h-%h-%h %an-%ae-%s
 do
 	test_perf "log with $format" "
 		git log --format=\"$format\" >/dev/null
diff --git a/t/perf/p4209-pickaxe.sh b/t/perf/p4209-pickaxe.sh
new file mode 100755
index 0000000..f585a44
--- /dev/null
+++ b/t/perf/p4209-pickaxe.sh
@@ -0,0 +1,70 @@
+#!/bin/sh
+
+test_description="Test pickaxe performance"
+
+. ./perf-lib.sh
+
+test_perf_default_repo
+
+# Not --max-count, as that's the number of matching commit, so it's
+# unbounded. We want to limit our revision walk here.
+from_rev_desc=
+from_rev=
+max_count=1000
+if test_have_prereq EXPENSIVE
+then
+	max_count=10000
+fi
+from_rev=" $(git rev-list HEAD | head -n $max_count | tail -n 1).."
+from_rev_desc=" <limit-rev>.."
+
+for icase in \
+	'' \
+	'-i '
+do
+	# -S (no regex)
+	for pattern in \
+		'int main' \
+		'æ'
+	do
+		for opts in \
+			'-S'
+		do
+			test_perf "git log $icase$opts'$pattern'$from_rev_desc" "
+				git log --pretty=format:%H $icase$opts'$pattern'$from_rev
+			"
+		done
+	done
+
+	# -S (regex)
+	for pattern in  \
+		'(int|void|null)' \
+		'if *\([^ ]+ & ' \
+		'[àáâãäåæñøùúûüýþ]'
+	do
+		for opts in \
+			'--pickaxe-regex -S'
+		do
+			test_perf "git log $icase$opts'$pattern'$from_rev_desc" "
+				git log --pretty=format:%H $icase$opts'$pattern'$from_rev
+			"
+		done
+	done
+
+	# -G
+	for pattern in  \
+		'(int|void|null)' \
+		'if *\([^ ]+ & ' \
+		'[àáâãäåæñøùúûüýþ]'
+	do
+		for opts in \
+			'-G'
+		do
+			test_perf "git log $icase$opts'$pattern'$from_rev_desc" "
+				git log --pretty=format:%H $icase$opts'$pattern'$from_rev
+			"
+		done
+	done
+done
+
+test_done
diff --git a/t/perf/p4220-log-grep-engines.sh b/t/perf/p4220-log-grep-engines.sh
index 2bc47de..03fbfbb 100755
--- a/t/perf/p4220-log-grep-engines.sh
+++ b/t/perf/p4220-log-grep-engines.sh
@@ -36,7 +36,8 @@ do
 		else
 			prereq=""
 		fi
-		test_perf $prereq "$engine log$GIT_PERF_4220_LOG_OPTS --grep='$pattern'" "
+		test_perf "$engine log$GIT_PERF_4220_LOG_OPTS --grep='$pattern'" \
+			--prereq "$prereq" "
 			git -c grep.patternType=$engine log --pretty=format:%h$GIT_PERF_4220_LOG_OPTS --grep='$pattern' >'out.$engine' || :
 		"
 	done
diff --git a/t/perf/p4221-log-grep-engines-fixed.sh b/t/perf/p4221-log-grep-engines-fixed.sh
index 0609712..0a6d6df 100755
--- a/t/perf/p4221-log-grep-engines-fixed.sh
+++ b/t/perf/p4221-log-grep-engines-fixed.sh
@@ -26,7 +26,8 @@ do
 		else
 			prereq=""
 		fi
-		test_perf $prereq "$engine log$GIT_PERF_4221_LOG_OPTS --grep='$pattern'" "
+		test_perf "$engine log$GIT_PERF_4221_LOG_OPTS --grep='$pattern'" \
+			--prereq "$prereq" "
 			git -c grep.patternType=$engine log --pretty=format:%h$GIT_PERF_4221_LOG_OPTS --grep='$pattern' >'out.$engine' || :
 		"
 	done
diff --git a/t/perf/p5302-pack-index.sh b/t/perf/p5302-pack-index.sh
index a9b3e11..14c601b 100755
--- a/t/perf/p5302-pack-index.sh
+++ b/t/perf/p5302-pack-index.sh
@@ -13,39 +13,37 @@ test_expect_success 'repack' '
 	export PACK
 '
 
-test_perf 'index-pack 0 threads' '
-	rm -rf repo.git &&
-	git init --bare repo.git &&
-	GIT_DIR=repo.git git index-pack --threads=1 --stdin < $PACK
-'
-
-test_perf 'index-pack 1 thread ' '
-	rm -rf repo.git &&
-	git init --bare repo.git &&
-	GIT_DIR=repo.git GIT_FORCE_THREADS=1 git index-pack --threads=1 --stdin < $PACK
-'
-
-test_perf 'index-pack 2 threads' '
-	rm -rf repo.git &&
-	git init --bare repo.git &&
-	GIT_DIR=repo.git git index-pack --threads=2 --stdin < $PACK
-'
-
-test_perf 'index-pack 4 threads' '
-	rm -rf repo.git &&
-	git init --bare repo.git &&
-	GIT_DIR=repo.git git index-pack --threads=4 --stdin < $PACK
+# Rather than counting up and doubling each time, count down from the endpoint,
+# halving each time. That ensures that our final test uses as many threads as
+# CPUs, even if it isn't a power of 2.
+test_expect_success 'set up thread-counting tests' '
+	t=$(test-tool online-cpus) &&
+	threads= &&
+	while test $t -gt 0
+	do
+		threads="$t $threads" &&
+		t=$((t / 2)) || return 1
+	done
 '
 
-test_perf 'index-pack 8 threads' '
-	rm -rf repo.git &&
-	git init --bare repo.git &&
-	GIT_DIR=repo.git git index-pack --threads=8 --stdin < $PACK
+test_perf 'index-pack 0 threads' --prereq PERF_EXTRA \
+	--setup 'rm -rf repo.git && git init --bare repo.git' '
+	GIT_DIR=repo.git git index-pack --threads=1 --stdin < $PACK
 '
 
-test_perf 'index-pack default number of threads' '
-	rm -rf repo.git &&
-	git init --bare repo.git &&
+for t in $threads
+do
+	THREADS=$t
+	export THREADS
+	test_perf "index-pack $t threads" --prereq PERF_EXTRA \
+		--setup 'rm -rf repo.git && git init --bare repo.git' '
+		GIT_DIR=repo.git GIT_FORCE_THREADS=1 \
+		git index-pack --threads=$THREADS --stdin <$PACK
+	'
+done
+
+test_perf 'index-pack default number of threads' \
+	--setup 'rm -rf repo.git && git init --bare repo.git' '
 	GIT_DIR=repo.git git index-pack --stdin < $PACK
 '
 
diff --git a/t/perf/p5303-many-packs.sh b/t/perf/p5303-many-packs.sh
index 7ee7916..af173a7 100755
--- a/t/perf/p5303-many-packs.sh
+++ b/t/perf/p5303-many-packs.sh
@@ -21,14 +21,25 @@ repack_into_n () {
 	mkdir staging &&
 
 	git rev-list --first-parent HEAD |
-	sed -n '1~5p' |
-	head -n "$1" |
-	perl -e 'print reverse <>' \
-	>pushes
+	perl -e '
+		my $n = shift;
+		while (<>) {
+			last unless @commits < $n;
+			push @commits, $_ if $. % 5 == 1;
+		}
+		print reverse @commits;
+	' "$1" >pushes &&
 
 	# create base packfile
-	head -n 1 pushes |
-	git pack-objects --delta-base-offset --revs staging/pack
+	base_pack=$(
+		head -n 1 pushes |
+		git pack-objects --delta-base-offset --revs staging/pack
+	) &&
+	test_export base_pack &&
+
+	# create an empty packfile
+	empty_pack=$(git pack-objects staging/pack </dev/null) &&
+	test_export empty_pack &&
 
 	# and then incrementals between each pair of commits
 	last= &&
@@ -45,6 +56,12 @@ repack_into_n () {
 		last=$rev
 	done <pushes &&
 
+	(
+		find staging -type f -name 'pack-*.pack' |
+			xargs -n 1 basename | grep -v "$base_pack" &&
+		printf "^pack-%s.pack\n" $base_pack
+	) >stdin.packs
+
 	# and install the whole thing
 	rm -f .git/objects/pack/* &&
 	mv staging/* .git/objects/pack/
@@ -73,6 +90,10 @@ do
 		git rev-list --objects --all >/dev/null
 	'
 
+	test_perf "abbrev-commit ($nr_packs)" '
+		git rev-list --abbrev-commit HEAD >/dev/null
+	'
+
 	# This simulates the interesting part of the repack, which is the
 	# actual pack generation, without smudging the on-disk setup
 	# between trials.
@@ -83,16 +104,33 @@ do
 		  --reflog --indexed-objects --delta-base-offset \
 		  --stdout </dev/null >/dev/null
 	'
+
+	test_perf "repack with kept ($nr_packs)" '
+		git pack-objects --keep-true-parents \
+		  --keep-pack=pack-$empty_pack.pack \
+		  --honor-pack-keep --non-empty --all \
+		  --reflog --indexed-objects --delta-base-offset \
+		  --stdout </dev/null >/dev/null
+	'
+
+	test_perf "repack with --stdin-packs ($nr_packs)" '
+		git pack-objects \
+		  --keep-true-parents \
+		  --stdin-packs \
+		  --non-empty \
+		  --delta-base-offset \
+		  --stdout <stdin.packs >/dev/null
+	'
 done
 
 # Measure pack loading with 10,000 packs.
 test_expect_success 'generate lots of packs' '
 	for i in $(test_seq 10000); do
-		echo "blob"
-		echo "data <<EOF"
-		echo "blob $i"
-		echo "EOF"
-		echo "checkpoint"
+		echo "blob" &&
+		echo "data <<EOF" &&
+		echo "blob $i" &&
+		echo "EOF" &&
+		echo "checkpoint" || return 1
 	done |
 	git -c fastimport.unpackLimit=0 fast-import
 '
diff --git a/t/perf/p5310-pack-bitmaps.sh b/t/perf/p5310-pack-bitmaps.sh
index b3e725f..b1399f1 100755
--- a/t/perf/p5310-pack-bitmaps.sh
+++ b/t/perf/p5310-pack-bitmaps.sh
@@ -2,98 +2,39 @@
 
 test_description='Tests pack performance using bitmaps'
 . ./perf-lib.sh
-
-test_perf_large_repo
-
-# note that we do everything through config,
-# since we want to be able to compare bitmap-aware
-# git versus non-bitmap git
-#
-# We intentionally use the deprecated pack.writebitmaps
-# config so that we can test against older versions of git.
-test_expect_success 'setup bitmap config' '
-	git config pack.writebitmaps true
-'
-
-test_perf 'repack to disk' '
-	git repack -ad
-'
-
-test_perf 'simulated clone' '
-	git pack-objects --stdout --all </dev/null >/dev/null
-'
-
-test_perf 'simulated fetch' '
-	have=$(git rev-list HEAD~100 -1) &&
-	{
-		echo HEAD &&
-		echo ^$have
-	} | git pack-objects --revs --stdout >/dev/null
-'
-
-test_perf 'pack to file (bitmap)' '
-	git pack-objects --use-bitmap-index --all pack1b </dev/null >/dev/null
-'
-
-test_perf 'rev-list (commits)' '
-	git rev-list --all --use-bitmap-index >/dev/null
-'
-
-test_perf 'rev-list (objects)' '
-	git rev-list --all --use-bitmap-index --objects >/dev/null
-'
-
-test_perf 'rev-list count with blob:none' '
-	git rev-list --use-bitmap-index --count --objects --all \
-		--filter=blob:none >/dev/null
-'
-
-test_perf 'rev-list count with blob:limit=1k' '
-	git rev-list --use-bitmap-index --count --objects --all \
-		--filter=blob:limit=1k >/dev/null
-'
-
-test_perf 'rev-list count with tree:0' '
-	git rev-list --use-bitmap-index --count --objects --all \
-		--filter=tree:0 >/dev/null
-'
-
-test_perf 'simulated partial clone' '
-	git pack-objects --stdout --all --filter=blob:none </dev/null >/dev/null
-'
-
-test_expect_success 'create partial bitmap state' '
-	# pick a commit to represent the repo tip in the past
-	cutoff=$(git rev-list HEAD~100 -1) &&
-	orig_tip=$(git rev-parse HEAD) &&
-
-	# now kill off all of the refs and pretend we had
-	# just the one tip
-	rm -rf .git/logs .git/refs/* .git/packed-refs &&
-	git update-ref HEAD $cutoff &&
-
-	# and then repack, which will leave us with a nice
-	# big bitmap pack of the "old" history, and all of
-	# the new history will be loose, as if it had been pushed
-	# up incrementally and exploded via unpack-objects
-	git repack -Ad &&
-
-	# and now restore our original tip, as if the pushes
-	# had happened
-	git update-ref HEAD $orig_tip
-'
-
-test_perf 'clone (partial bitmap)' '
-	git pack-objects --stdout --all </dev/null >/dev/null
-'
-
-test_perf 'pack to file (partial bitmap)' '
-	git pack-objects --use-bitmap-index --all pack2b </dev/null >/dev/null
-'
-
-test_perf 'rev-list with tree filter (partial bitmap)' '
-	git rev-list --use-bitmap-index --count --objects --all \
-		--filter=tree:0 >/dev/null
-'
+. "${TEST_DIRECTORY}/perf/lib-bitmap.sh"
+
+test_lookup_pack_bitmap () {
+	test_expect_success 'start the test from scratch' '
+		rm -rf * .git
+	'
+
+	test_perf_large_repo
+
+	# note that we do everything through config,
+	# since we want to be able to compare bitmap-aware
+	# git versus non-bitmap git
+	#
+	# We intentionally use the deprecated pack.writebitmaps
+	# config so that we can test against older versions of git.
+	test_expect_success 'setup bitmap config' '
+		git config pack.writebitmaps true
+	'
+
+	# we need to create the tag up front such that it is covered by the repack and
+	# thus by generated bitmaps.
+	test_expect_success 'create tags' '
+		git tag --message="tag pointing to HEAD" perf-tag HEAD
+	'
+
+	test_perf "enable lookup table: $1" '
+		git config pack.writeBitmapLookupTable '"$1"'
+	'
+
+	test_pack_bitmap
+}
+
+test_lookup_pack_bitmap false
+test_lookup_pack_bitmap true
 
 test_done
diff --git a/t/perf/p5311-pack-bitmaps-fetch.sh b/t/perf/p5311-pack-bitmaps-fetch.sh
index 47c3fd7..426fab8 100755
--- a/t/perf/p5311-pack-bitmaps-fetch.sh
+++ b/t/perf/p5311-pack-bitmaps-fetch.sh
@@ -3,42 +3,52 @@
 test_description='performance of fetches from bitmapped packs'
 . ./perf-lib.sh
 
-test_perf_default_repo
-
-test_expect_success 'create bitmapped server repo' '
-	git config pack.writebitmaps true &&
-	git repack -ad
-'
-
-# simulate a fetch from a repository that last fetched N days ago, for
-# various values of N. We do so by following the first-parent chain,
-# and assume the first entry in the chain that is N days older than the current
-# HEAD is where the HEAD would have been then.
-for days in 1 2 4 8 16 32 64 128; do
-	title=$(printf '%10s' "($days days)")
-	test_expect_success "setup revs from $days days ago" '
-		now=$(git log -1 --format=%ct HEAD) &&
-		then=$(($now - ($days * 86400))) &&
-		tip=$(git rev-list -1 --first-parent --until=$then HEAD) &&
-		{
-			echo HEAD &&
-			echo ^$tip
-		} >revs
+test_fetch_bitmaps () {
+	test_expect_success 'setup test directory' '
+		rm -fr * .git
 	'
 
-	test_perf "server $title" '
-		git pack-objects --stdout --revs \
-				 --thin --delta-base-offset \
-				 <revs >tmp.pack
-	'
+	test_perf_default_repo
 
-	test_size "size   $title" '
-		wc -c <tmp.pack
+	test_expect_success 'create bitmapped server repo' '
+		git config pack.writebitmaps true &&
+		git config pack.writeBitmapLookupTable '"$1"' &&
+		git repack -ad
 	'
 
-	test_perf "client $title" '
-		git index-pack --stdin --fix-thin <tmp.pack
-	'
-done
+	# simulate a fetch from a repository that last fetched N days ago, for
+	# various values of N. We do so by following the first-parent chain,
+	# and assume the first entry in the chain that is N days older than the current
+	# HEAD is where the HEAD would have been then.
+	for days in 1 2 4 8 16 32 64 128; do
+		title=$(printf '%10s' "($days days)")
+		test_expect_success "setup revs from $days days ago" '
+			now=$(git log -1 --format=%ct HEAD) &&
+			then=$(($now - ($days * 86400))) &&
+			tip=$(git rev-list -1 --first-parent --until=$then HEAD) &&
+			{
+				echo HEAD &&
+				echo ^$tip
+			} >revs
+		'
+
+		test_perf "server $title (lookup=$1)" '
+			git pack-objects --stdout --revs \
+					--thin --delta-base-offset \
+					<revs >tmp.pack
+		'
+
+		test_size "size   $title" '
+			wc -c <tmp.pack
+		'
+
+		test_perf "client $title (lookup=$1)" '
+			git index-pack --stdin --fix-thin <tmp.pack
+		'
+	done
+}
+
+test_fetch_bitmaps true
+test_fetch_bitmaps false
 
 test_done
diff --git a/t/perf/p5312-pack-bitmaps-revs.sh b/t/perf/p5312-pack-bitmaps-revs.sh
new file mode 100755
index 0000000..ceec606
--- /dev/null
+++ b/t/perf/p5312-pack-bitmaps-revs.sh
@@ -0,0 +1,34 @@
+#!/bin/sh
+
+test_description='Tests pack performance using bitmaps (rev index enabled)'
+. ./perf-lib.sh
+. "${TEST_DIRECTORY}/perf/lib-bitmap.sh"
+
+test_lookup_pack_bitmap () {
+	test_expect_success 'start the test from scratch' '
+		rm -rf * .git
+	'
+
+	test_perf_large_repo
+
+	test_expect_success 'setup bitmap config' '
+		git config pack.writebitmaps true
+	'
+
+	# we need to create the tag up front such that it is covered by the repack and
+	# thus by generated bitmaps.
+	test_expect_success 'create tags' '
+		git tag --message="tag pointing to HEAD" perf-tag HEAD
+	'
+
+	test_perf "enable lookup table: $1" '
+		git config pack.writeBitmapLookupTable '"$1"'
+	'
+
+	test_pack_bitmap
+}
+
+test_lookup_pack_bitmap false
+test_lookup_pack_bitmap true
+
+test_done
diff --git a/t/perf/p5326-multi-pack-bitmaps.sh b/t/perf/p5326-multi-pack-bitmaps.sh
new file mode 100755
index 0000000..d082e6c
--- /dev/null
+++ b/t/perf/p5326-multi-pack-bitmaps.sh
@@ -0,0 +1,67 @@
+#!/bin/sh
+
+test_description='Tests performance using midx bitmaps'
+. ./perf-lib.sh
+. "${TEST_DIRECTORY}/perf/lib-bitmap.sh"
+
+test_bitmap () {
+	local enabled="$1"
+
+	test_expect_success "remove existing repo (lookup=$enabled)" '
+		rm -fr * .git
+	'
+
+	test_perf_large_repo
+
+	# we need to create the tag up front such that it is covered by the repack and
+	# thus by generated bitmaps.
+	test_expect_success 'create tags' '
+		git tag --message="tag pointing to HEAD" perf-tag HEAD
+	'
+
+	test_expect_success "use lookup table: $enabled" '
+		git config pack.writeBitmapLookupTable '"$enabled"'
+	'
+
+	test_expect_success "start with bitmapped pack (lookup=$enabled)" '
+		git repack -adb
+	'
+
+	test_perf "setup multi-pack index (lookup=$enabled)" '
+		git multi-pack-index write --bitmap
+	'
+
+	test_expect_success "drop pack bitmap (lookup=$enabled)" '
+		rm -f .git/objects/pack/pack-*.bitmap
+	'
+
+	test_full_bitmap
+
+	test_expect_success "create partial bitmap state (lookup=$enabled)" '
+		# pick a commit to represent the repo tip in the past
+		cutoff=$(git rev-list HEAD~100 -1) &&
+		orig_tip=$(git rev-parse HEAD) &&
+
+		# now pretend we have just one tip
+		rm -rf .git/logs .git/refs/* .git/packed-refs &&
+		git update-ref HEAD $cutoff &&
+
+		# and then repack, which will leave us with a nice
+		# big bitmap pack of the "old" history, and all of
+		# the new history will be loose, as if it had been pushed
+		# up incrementally and exploded via unpack-objects
+		git repack -Ad &&
+		git multi-pack-index write --bitmap &&
+
+		# and now restore our original tip, as if the pushes
+		# had happened
+		git update-ref HEAD $orig_tip
+	'
+
+	test_partial_bitmap
+}
+
+test_bitmap false
+test_bitmap true
+
+test_done
diff --git a/t/perf/p5332-multi-pack-reuse.sh b/t/perf/p5332-multi-pack-reuse.sh
new file mode 100755
index 0000000..5c6c575
--- /dev/null
+++ b/t/perf/p5332-multi-pack-reuse.sh
@@ -0,0 +1,81 @@
+#!/bin/sh
+
+test_description='tests pack performance with multi-pack reuse'
+
+. ./perf-lib.sh
+. "${TEST_DIRECTORY}/perf/lib-pack.sh"
+
+packdir=.git/objects/pack
+
+test_perf_large_repo
+
+find_pack () {
+	for idx in $packdir/pack-*.idx
+	do
+		if git show-index <$idx | grep -q "$1"
+		then
+			basename $idx
+		fi || return 1
+	done
+}
+
+repack_into_n_chunks () {
+	git repack -adk &&
+
+	test "$1" -eq 1 && return ||
+
+	find $packdir -type f | sort >packs.before &&
+
+	# partition the repository into $1 chunks of consecutive commits, and
+	# then create $1 packs with the objects reachable from each chunk
+	# (excluding any objects reachable from the previous chunks)
+	sz="$(($(git rev-list --count --all) / $1))"
+	for rev in $(git rev-list --all | awk "NR % $sz == 0" | tac)
+	do
+		pack="$(echo "$rev" | git pack-objects --revs \
+			--honor-pack-keep --delta-base-offset $packdir/pack)" &&
+		touch $packdir/pack-$pack.keep || return 1
+	done
+
+	# grab any remaining objects not packed by the previous step(s)
+	git pack-objects --revs --all --honor-pack-keep --delta-base-offset \
+		$packdir/pack &&
+
+	find $packdir -type f | sort >packs.after &&
+
+	# and install the whole thing
+	for f in $(comm -12 packs.before packs.after)
+	do
+		rm -f "$f" || return 1
+	done
+	rm -fr $packdir/*.keep
+}
+
+for nr_packs in 1 10 100
+do
+	test_expect_success "create $nr_packs-pack scenario" '
+		repack_into_n_chunks $nr_packs
+	'
+
+	test_expect_success "setup bitmaps for $nr_packs-pack scenario" '
+		find $packdir -type f -name "*.idx" | sed -e "s/.*\/\(.*\)$/+\1/g" |
+		git multi-pack-index write --stdin-packs --bitmap \
+			--preferred-pack="$(find_pack $(git rev-parse HEAD))"
+	'
+
+	for reuse in single multi
+	do
+		test_perf "clone for $nr_packs-pack scenario ($reuse-pack reuse)" "
+			git for-each-ref --format='%(objectname)' refs/heads refs/tags >in &&
+			git -c pack.allowPackReuse=$reuse pack-objects \
+				--revs --delta-base-offset --use-bitmap-index \
+				--stdout <in >result
+		"
+
+		test_size "clone size for $nr_packs-pack scenario ($reuse-pack reuse)" '
+			wc -c <result
+		'
+	done
+done
+
+test_done
diff --git a/t/perf/p5600-partial-clone.sh b/t/perf/p5600-partial-clone.sh
index 3e04bd2..a965f2c 100755
--- a/t/perf/p5600-partial-clone.sh
+++ b/t/perf/p5600-partial-clone.sh
@@ -23,4 +23,20 @@ test_perf 'checkout of result' '
 	git -C worktree checkout -f
 '
 
+test_perf 'fsck' '
+	git -C bare.git fsck
+'
+
+test_perf 'count commits' '
+	git -C bare.git rev-list --all --count
+'
+
+test_perf 'count non-promisor commits' '
+	git -C bare.git rev-list --all --count --exclude-promisor-objects
+'
+
+test_perf 'gc' '
+	git -C bare.git gc
+'
+
 test_done
diff --git a/t/perf/p6300-for-each-ref.sh b/t/perf/p6300-for-each-ref.sh
new file mode 100755
index 0000000..fa7289c
--- /dev/null
+++ b/t/perf/p6300-for-each-ref.sh
@@ -0,0 +1,87 @@
+#!/bin/sh
+
+test_description='performance of for-each-ref'
+. ./perf-lib.sh
+
+test_perf_fresh_repo
+
+ref_count_per_type=10000
+test_iteration_count=10
+
+test_expect_success "setup" '
+	test_commit_bulk $(( 1 + $ref_count_per_type )) &&
+
+	# Create refs
+	test_seq $ref_count_per_type |
+		sed "s,.*,update refs/heads/branch_& HEAD~&\nupdate refs/custom/special_& HEAD~&," |
+		git update-ref --stdin &&
+
+	# Create annotated tags
+	for i in $(test_seq $ref_count_per_type)
+	do
+		# Base tags
+		echo "tag tag_$i" &&
+		echo "mark :$i" &&
+		echo "from HEAD~$i" &&
+		printf "tagger %s <%s> %s\n" \
+			"$GIT_COMMITTER_NAME" \
+			"$GIT_COMMITTER_EMAIL" \
+			"$GIT_COMMITTER_DATE" &&
+		echo "data <<EOF" &&
+		echo "tag $i" &&
+		echo "EOF" &&
+
+		# Nested tags
+		echo "tag nested_$i" &&
+		echo "from :$i" &&
+		printf "tagger %s <%s> %s\n" \
+			"$GIT_COMMITTER_NAME" \
+			"$GIT_COMMITTER_EMAIL" \
+			"$GIT_COMMITTER_DATE" &&
+		echo "data <<EOF" &&
+		echo "nested tag $i" &&
+		echo "EOF" || return 1
+	done | git fast-import
+'
+
+test_for_each_ref () {
+	title="for-each-ref"
+	if test $# -gt 0; then
+		title="$title ($1)"
+		shift
+	fi
+	args="$@"
+
+	test_perf "$title" "
+		for i in \$(test_seq $test_iteration_count); do
+			git for-each-ref $args >/dev/null
+		done
+	"
+}
+
+run_tests () {
+	test_for_each_ref "$1"
+	test_for_each_ref "$1, no sort" --no-sort
+	test_for_each_ref "$1, --count=1" --count=1
+	test_for_each_ref "$1, --count=1, no sort" --no-sort --count=1
+	test_for_each_ref "$1, tags" refs/tags/
+	test_for_each_ref "$1, tags, no sort" --no-sort refs/tags/
+	test_for_each_ref "$1, tags, dereferenced" '--format="%(refname) %(objectname) %(*objectname)"' refs/tags/
+	test_for_each_ref "$1, tags, dereferenced, no sort" --no-sort '--format="%(refname) %(objectname) %(*objectname)"' refs/tags/
+
+	test_perf "for-each-ref ($1, tags) + cat-file --batch-check (dereferenced)" "
+		for i in \$(test_seq $test_iteration_count); do
+			git for-each-ref --format='%(objectname)^{} %(refname) %(objectname)' refs/tags/ | \
+				git cat-file --batch-check='%(objectname) %(rest)' >/dev/null
+		done
+	"
+}
+
+run_tests "loose"
+
+test_expect_success 'pack refs' '
+	git pack-refs --all
+'
+run_tests "packed"
+
+test_done
diff --git a/t/perf/p7102-reset.sh b/t/perf/p7102-reset.sh
new file mode 100755
index 0000000..9b039e8
--- /dev/null
+++ b/t/perf/p7102-reset.sh
@@ -0,0 +1,21 @@
+#!/bin/sh
+
+test_description='performance of reset'
+. ./perf-lib.sh
+
+test_perf_default_repo
+test_checkout_worktree
+
+test_perf 'reset --hard with change in tree' '
+	base=$(git rev-parse HEAD) &&
+	test_commit --no-tag A &&
+	new=$(git rev-parse HEAD) &&
+
+	for i in $(test_seq 10)
+	do
+		git reset --hard $new &&
+		git reset --hard $base || return $?
+	done
+'
+
+test_done
diff --git a/t/perf/p7519-fsmonitor.sh b/t/perf/p7519-fsmonitor.sh
index def7ecd..b1cb238 100755
--- a/t/perf/p7519-fsmonitor.sh
+++ b/t/perf/p7519-fsmonitor.sh
@@ -22,7 +22,9 @@ test_description="Test core.fsmonitor"
 #
 # GIT_PERF_7519_UNTRACKED_CACHE: used to configure core.untrackedCache
 # GIT_PERF_7519_SPLIT_INDEX: used to configure core.splitIndex
-# GIT_PERF_7519_FSMONITOR: used to configure core.fsMonitor
+# GIT_PERF_7519_FSMONITOR: used to configure core.fsMonitor. May be an
+#   absolute path to an integration. May be a space delimited list of
+#   absolute paths to integrations.
 #
 # The big win for using fsmonitor is the elimination of the need to scan the
 # working directory looking for changed and untracked files. If the file
@@ -30,6 +32,8 @@ test_description="Test core.fsmonitor"
 #
 # GIT_PERF_7519_DROP_CACHE: if set, the OS caches are dropped between tests
 #
+# GIT_PERF_7519_TRACE: if set, enable trace logging during the test.
+#   Trace logs will be grouped by fsmonitor provider.
 
 test_perf_large_repo
 test_checkout_worktree
@@ -56,19 +60,40 @@ then
 	esac
 fi
 
-if test -n "$GIT_PERF_7519_DROP_CACHE"
-then
-	# When using GIT_PERF_7519_DROP_CACHE, GIT_PERF_REPEAT_COUNT must be 1 to
-	# generate valid results. Otherwise the caching that happens for the nth
-	# run will negate the validity of the comparisons.
-	if test "$GIT_PERF_REPEAT_COUNT" -ne 1
+trace_start () {
+	if test -n "$GIT_PERF_7519_TRACE"
 	then
-		echo "warning: Setting GIT_PERF_REPEAT_COUNT=1" >&2
-		GIT_PERF_REPEAT_COUNT=1
+		name="$1"
+		TEST_TRACE_DIR="$TEST_OUTPUT_DIRECTORY/test-trace/p7519/"
+		echo "Writing trace logging to $TEST_TRACE_DIR"
+
+		mkdir -p "$TEST_TRACE_DIR"
+
+		# Start Trace2 logging and any other GIT_TRACE_* logs that you
+		# want for this named test case.
+
+		GIT_TRACE2_PERF="$TEST_TRACE_DIR/$name.trace2perf"
+		export GIT_TRACE2_PERF
+
+		>"$GIT_TRACE2_PERF"
 	fi
-fi
+}
+
+trace_stop () {
+	if test -n "$GIT_PERF_7519_TRACE"
+	then
+		unset GIT_TRACE2_PERF
+	fi
+}
 
-test_expect_success "setup for fsmonitor" '
+touch_files () {
+	n=$1 &&
+	d="$n"_files &&
+
+	(cd $d && test_seq 1 $n | xargs touch )
+}
+
+test_expect_success "one time repo setup" '
 	# set untrackedCache depending on the environment
 	if test -n "$GIT_PERF_7519_UNTRACKED_CACHE"
 	then
@@ -88,24 +113,37 @@ test_expect_success "setup for fsmonitor" '
 		git config core.splitIndex "$GIT_PERF_7519_SPLIT_INDEX"
 	fi &&
 
+	mkdir 1_file 10_files 100_files 1000_files 10000_files &&
+	: 1_file directory should be left empty &&
+	touch_files 10 &&
+	touch_files 100 &&
+	touch_files 1000 &&
+	touch_files 10000 &&
+	git add 1_file 10_files 100_files 1000_files 10000_files &&
+	git commit -qm "Add files" &&
+
+	# If Watchman exists, watch the work tree and attempt a query.
+	if test_have_prereq WATCHMAN; then
+		watchman watch "$GIT_WORK_TREE" &&
+		watchman watch-list | grep -q -F "p7519-fsmonitor"
+	fi
+'
+
+setup_for_fsmonitor_hook () {
 	# set INTEGRATION_SCRIPT depending on the environment
-	if test -n "$GIT_PERF_7519_FSMONITOR"
+	if test -n "$INTEGRATION_PATH"
 	then
-		INTEGRATION_SCRIPT="$GIT_PERF_7519_FSMONITOR"
+		INTEGRATION_SCRIPT="$INTEGRATION_PATH"
 	else
 		#
 		# Choose integration script based on existence of Watchman.
-		# If Watchman exists, watch the work tree and attempt a query.
-		# If everything succeeds, use Watchman integration script,
-		# else fall back to an empty integration script.
+		# Fall back to an empty integration script.
 		#
 		mkdir .git/hooks &&
 		if test_have_prereq WATCHMAN
 		then
 			INTEGRATION_SCRIPT=".git/hooks/fsmonitor-watchman" &&
-			cp "$TEST_DIRECTORY/../templates/hooks--fsmonitor-watchman.sample" "$INTEGRATION_SCRIPT" &&
-			watchman watch "$GIT_WORK_TREE" &&
-			watchman watch-list | grep -q -F "$GIT_WORK_TREE"
+			cp "$TEST_DIRECTORY/../templates/hooks--fsmonitor-watchman.sample" "$INTEGRATION_SCRIPT"
 		else
 			INTEGRATION_SCRIPT=".git/hooks/fsmonitor-empty" &&
 			write_script "$INTEGRATION_SCRIPT"<<-\EOF
@@ -114,62 +152,114 @@ test_expect_success "setup for fsmonitor" '
 	fi &&
 
 	git config core.fsmonitor "$INTEGRATION_SCRIPT" &&
-	git update-index --fsmonitor
-'
+	git update-index --fsmonitor 2>error &&
+	if test_have_prereq WATCHMAN
+	then
+		test_must_be_empty error  # ensure no silent error
+	else
+		grep "Empty last update token" error
+	fi
+}
 
-if test -n "$GIT_PERF_7519_DROP_CACHE"; then
-	test-tool drop-caches
-fi
+test_perf_w_drop_caches () {
+	if test -n "$GIT_PERF_7519_DROP_CACHE"; then
+		test_perf "$1" --setup "test-tool drop-caches" "$2"
+	else
+		test_perf "$@"
+	fi
+}
 
-test_perf "status (fsmonitor=$INTEGRATION_SCRIPT)" '
-	git status
-'
+test_fsmonitor_suite () {
+	if test -n "$USE_FSMONITOR_DAEMON"
+	then
+		DESC="builtin fsmonitor--daemon"
+	elif test -n "$INTEGRATION_SCRIPT"
+	then
+		DESC="fsmonitor=$(basename $INTEGRATION_SCRIPT)"
+	else
+		DESC="fsmonitor=disabled"
+	fi
 
-if test -n "$GIT_PERF_7519_DROP_CACHE"; then
-	test-tool drop-caches
-fi
+	test_expect_success "test_initialization" '
+		git reset --hard &&
+		git status  # Warm caches
+	'
 
-test_perf "status -uno (fsmonitor=$INTEGRATION_SCRIPT)" '
-	git status -uno
-'
+	test_perf_w_drop_caches "status ($DESC)" '
+		git status
+	'
 
-if test -n "$GIT_PERF_7519_DROP_CACHE"; then
-	test-tool drop-caches
-fi
+	test_perf_w_drop_caches "status -uno ($DESC)" '
+		git status -uno
+	'
 
-test_perf "status -uall (fsmonitor=$INTEGRATION_SCRIPT)" '
-	git status -uall
-'
+	test_perf_w_drop_caches "status -uall ($DESC)" '
+		git status -uall
+	'
 
-test_expect_success "setup without fsmonitor" '
-	unset INTEGRATION_SCRIPT &&
-	git config --unset core.fsmonitor &&
-	git update-index --no-fsmonitor
-'
+	# Update the mtimes on upto 100k files to make status think
+	# that they are dirty.  For simplicity, omit any files with
+	# LFs (i.e. anything that ls-files thinks it needs to dquote)
+	# and any files with whitespace so that they pass thru xargs
+	# properly.
+	#
+	test_perf_w_drop_caches "status (dirty) ($DESC)" '
+		git ls-files | \
+			head -100000 | \
+			grep -v \" | \
+			grep -v " ." | \
+			xargs test-tool chmtime -300 &&
+		git status
+	'
 
-if test -n "$GIT_PERF_7519_DROP_CACHE"; then
-	test-tool drop-caches
-fi
+	test_perf_w_drop_caches "diff ($DESC)" '
+		git diff
+	'
 
-test_perf "status (fsmonitor=$INTEGRATION_SCRIPT)" '
-	git status
-'
+	test_perf_w_drop_caches "diff HEAD ($DESC)" '
+		git diff HEAD
+	'
 
-if test -n "$GIT_PERF_7519_DROP_CACHE"; then
-	test-tool drop-caches
-fi
+	test_perf_w_drop_caches "diff -- 0_files ($DESC)" '
+		git diff -- 1_file
+	'
 
-test_perf "status -uno (fsmonitor=$INTEGRATION_SCRIPT)" '
-	git status -uno
-'
+	test_perf_w_drop_caches "diff -- 10_files ($DESC)" '
+		git diff -- 10_files
+	'
 
-if test -n "$GIT_PERF_7519_DROP_CACHE"; then
-	test-tool drop-caches
-fi
+	test_perf_w_drop_caches "diff -- 100_files ($DESC)" '
+		git diff -- 100_files
+	'
 
-test_perf "status -uall (fsmonitor=$INTEGRATION_SCRIPT)" '
-	git status -uall
-'
+	test_perf_w_drop_caches "diff -- 1000_files ($DESC)" '
+		git diff -- 1000_files
+	'
+
+	test_perf_w_drop_caches "diff -- 10000_files ($DESC)" '
+		git diff -- 10000_files
+	'
+
+	test_perf_w_drop_caches "add ($DESC)" '
+		git add  --all
+	'
+}
+
+#
+# Run a full set of perf tests using each Hook-based fsmonitor provider,
+# such as Watchman.
+#
+
+trace_start fsmonitor-watchman
+if test -n "$GIT_PERF_7519_FSMONITOR"; then
+	for INTEGRATION_PATH in $GIT_PERF_7519_FSMONITOR; do
+		test_expect_success "setup for fsmonitor $INTEGRATION_PATH" 'setup_for_fsmonitor_hook'
+		test_fsmonitor_suite
+	done
+else
+	test_expect_success "setup for fsmonitor hook" 'setup_for_fsmonitor_hook'
+	test_fsmonitor_suite
+fi
 
 if test_have_prereq WATCHMAN
 then
@@ -179,5 +269,46 @@ then
 	# preventing the removal of the trash directory
 	watchman shutdown-server >/dev/null 2>&1
 fi
+trace_stop
+
+#
+# Run a full set of perf tests with the fsmonitor feature disabled.
+#
+
+trace_start fsmonitor-disabled
+test_expect_success "setup without fsmonitor" '
+	unset INTEGRATION_SCRIPT &&
+	git config --unset core.fsmonitor &&
+	git update-index --no-fsmonitor
+'
+
+test_fsmonitor_suite
+trace_stop
+
+#
+# Run a full set of perf tests using the built-in fsmonitor--daemon.
+# It does not use the Hook API, so it has a different setup.
+# Explicitly start the daemon here and before we start client commands
+# so that we can later add custom tracing.
+#
+if test_have_prereq FSMONITOR_DAEMON
+then
+	USE_FSMONITOR_DAEMON=t
+
+	test_expect_success "setup for builtin fsmonitor" '
+		trace_start fsmonitor--daemon--server &&
+		git fsmonitor--daemon start &&
+
+		trace_start fsmonitor--daemon--client &&
+
+		git config core.fsmonitor true &&
+		git update-index --fsmonitor
+	'
+
+	test_fsmonitor_suite
+
+	git fsmonitor--daemon stop
+	trace_stop
+fi
 
 test_done
diff --git a/t/perf/p7527-builtin-fsmonitor.sh b/t/perf/p7527-builtin-fsmonitor.sh
new file mode 100755
index 0000000..c3f9a4c
--- /dev/null
+++ b/t/perf/p7527-builtin-fsmonitor.sh
@@ -0,0 +1,257 @@
+#!/bin/sh
+
+test_description="Perf test for the builtin FSMonitor"
+
+. ./perf-lib.sh
+
+if ! test_have_prereq FSMONITOR_DAEMON
+then
+	skip_all="fsmonitor--daemon is not supported on this platform"
+	test_done
+fi
+
+test_lazy_prereq UNTRACKED_CACHE '
+	{ git update-index --test-untracked-cache; ret=$?; } &&
+	test $ret -ne 1
+'
+
+# Lie to perf-lib and ask for a new empty repo and avoid
+# the complaints about GIT_PERF_REPO not being big enough
+# the perf hit when GIT_PERF_LARGE_REPO is copied into
+# the trash directory.
+#
+# NEEDSWORK: It would be nice if perf-lib had an option to
+# "borrow" an existing large repo (especially for gigantic
+# monorepos) and use it in-place.  For now, fake it here.
+#
+test_perf_fresh_repo
+
+
+# Use a generated synthetic monorepo.  If it doesn't exist, we will
+# generate it.  If it does exist, we will put it in a known state
+# before we start our timings.
+#
+PARAM_D=5
+PARAM_W=10
+PARAM_F=9
+
+PARAMS="$PARAM_D"."$PARAM_W"."$PARAM_F"
+
+BALLAST_BR=p0006-ballast
+export BALLAST_BR
+
+TMP_BR=tmp_br
+export TMP_BR
+
+REPO=../repos/gen-many-files-"$PARAMS".git
+export REPO
+
+if ! test -d $REPO
+then
+	(cd ../repos; ./many-files.sh -d $PARAM_D -w $PARAM_W -f $PARAM_F)
+fi
+
+
+enable_uc () {
+	git -C $REPO config core.untrackedcache true
+	git -C $REPO update-index --untracked-cache
+	git -C $REPO status >/dev/null 2>&1
+}
+
+disable_uc () {
+	git -C $REPO config core.untrackedcache false
+	git -C $REPO update-index --no-untracked-cache
+	git -C $REPO status >/dev/null 2>&1
+}
+
+start_fsm () {
+	git -C $REPO fsmonitor--daemon start
+	git -C $REPO fsmonitor--daemon status
+	git -C $REPO config core.fsmonitor true
+	git -C $REPO update-index --fsmonitor
+	git -C $REPO status >/dev/null 2>&1
+}
+
+stop_fsm () {
+	git -C $REPO config --unset core.fsmonitor
+	git -C $REPO update-index --no-fsmonitor
+	test_might_fail git -C $REPO fsmonitor--daemon stop 2>/dev/null
+	git -C $REPO status >/dev/null 2>&1
+}
+
+
+# Ensure that FSMonitor is turned off on the borrowed repo.
+#
+test_expect_success "Setup borrowed repo (fsm+uc)" "
+	stop_fsm &&
+	disable_uc
+"
+
+# Also ensure that it starts in a known state.
+#
+# Because we assume that $GIT_PERF_REPEAT_COUNT > 1, we are not going to time
+# the ballast checkout, since only the first invocation does any work and the
+# subsequent ones just print "already on branch" and quit, so the reported
+# time is not useful.
+#
+# Create a temp branch and do all work relative to it so that we don't
+# accidentially alter the real ballast branch.
+#
+test_expect_success "Setup borrowed repo (temp ballast branch)" "
+	test_might_fail git -C $REPO checkout $BALLAST_BR &&
+	test_might_fail git -C $REPO reset --hard &&
+	git -C $REPO clean -d -f &&
+	test_might_fail git -C $REPO branch -D $TMP_BR &&
+	git -C $REPO branch $TMP_BR $BALLAST_BR &&
+	git -C $REPO checkout $TMP_BR
+"
+
+
+echo Data >data.txt
+
+# NEEDSWORK: We assume that $GIT_PERF_REPEAT_COUNT > 1.  With
+# FSMonitor enabled, we can get a skewed view of status times, since
+# the index MAY (or may not) be updated after the first invocation
+# which will update the FSMonitor Token, so the subsequent invocations
+# may get a smaller response from the daemon.
+#
+do_status () {
+	msg=$1
+
+	test_perf "$msg" "
+		git -C $REPO status >/dev/null 2>&1
+	"
+}
+
+do_matrix () {
+	uc=$1
+	fsm=$2
+
+	t="[uc $uc][fsm $fsm]"
+	MATRIX_BR="$TMP_BR-$uc-$fsm"
+
+	test_expect_success "$t Setup matrix branch" "
+		git -C $REPO clean -d -f &&
+		git -C $REPO checkout $TMP_BR &&
+		test_might_fail git -C $REPO branch -D $MATRIX_BR &&
+		git -C $REPO branch $MATRIX_BR $TMP_BR &&
+		git -C $REPO checkout $MATRIX_BR
+	"
+
+	if test $uc = true
+	then
+		enable_uc
+	else
+		disable_uc
+	fi
+
+	if test $fsm = true
+	then
+		start_fsm
+	else
+		stop_fsm
+	fi
+
+	do_status "$t status after checkout"
+
+	# Modify many files in the matrix branch.
+	# Stage them.
+	# Commit them.
+	# Rollback.
+	#
+	test_expect_success "$t modify tracked files" "
+		find $REPO -name file1 -exec cp data.txt {} \\;
+	"
+
+	do_status "$t status after big change"
+
+	# Don't bother timing the "add" because _REPEAT_COUNT
+	# issue described above.
+	#
+	test_expect_success "$t add all" "
+		git -C $REPO add -A
+	"
+
+	do_status "$t status after add all"
+
+	test_expect_success "$t add dot" "
+		git -C $REPO add .
+	"
+
+	do_status "$t status after add dot"
+
+	test_expect_success "$t commit staged" "
+		git -C $REPO commit -a -m data
+	"
+
+	do_status "$t status after commit"
+
+	test_expect_success "$t reset HEAD~1 hard" "
+		git -C $REPO reset --hard HEAD~1 >/dev/null 2>&1
+	"
+
+	do_status "$t status after reset hard"
+
+	# Create some untracked files.
+	#
+	test_expect_success "$t create untracked files" "
+		cp -R $REPO/ballast/dir1 $REPO/ballast/xxx1
+	"
+
+	do_status "$t status after create untracked files"
+
+	# Remove the new untracked files.
+	#
+	test_expect_success "$t clean -df" "
+		git -C $REPO clean -d -f
+	"
+
+	do_status "$t status after clean"
+
+	if test $fsm = true
+	then
+		stop_fsm
+	fi
+}
+
+# Begin testing each case in the matrix that we care about.
+#
+uc_values="false"
+test_have_prereq UNTRACKED_CACHE && uc_values="false true"
+
+fsm_values="false true"
+
+for uc_val in $uc_values
+do
+	for fsm_val in $fsm_values
+	do
+		do_matrix $uc_val $fsm_val
+	done
+done
+
+cleanup () {
+	uc=$1
+	fsm=$2
+
+	MATRIX_BR="$TMP_BR-$uc-$fsm"
+
+	test_might_fail git -C $REPO branch -D $MATRIX_BR
+}
+
+
+# We're borrowing this repo.  We should leave it in a clean state.
+#
+test_expect_success "Cleanup temp and matrix branches" "
+	git -C $REPO clean -d -f &&
+	test_might_fail git -C $REPO checkout $BALLAST_BR &&
+	test_might_fail git -C $REPO branch -D $TMP_BR &&
+	for uc_val in $uc_values
+	do
+		for fsm_val in $fsm_values
+		do
+			cleanup $uc_val $fsm_val || return 1
+		done
+	done
+"
+
+test_done
diff --git a/t/perf/p7820-grep-engines.sh b/t/perf/p7820-grep-engines.sh
index 8b09c5b..9bfb868 100755
--- a/t/perf/p7820-grep-engines.sh
+++ b/t/perf/p7820-grep-engines.sh
@@ -49,13 +49,15 @@ do
 		fi
 		if ! test_have_prereq PERF_GREP_ENGINES_THREADS
 		then
-			test_perf $prereq "$engine grep$GIT_PERF_7820_GREP_OPTS '$pattern'" "
+			test_perf "$engine grep$GIT_PERF_7820_GREP_OPTS '$pattern'" \
+				--prereq "$prereq" "
 				git -c grep.patternType=$engine grep$GIT_PERF_7820_GREP_OPTS -- '$pattern' >'out.$engine' || :
 			"
 		else
 			for threads in $GIT_PERF_GREP_THREADS
 			do
-				test_perf PTHREADS,$prereq "$engine grep$GIT_PERF_7820_GREP_OPTS '$pattern' with $threads threads" "
+				test_perf "$engine grep$GIT_PERF_7820_GREP_OPTS '$pattern' with $threads threads"
+					--prereq PTHREADS,$prereq "
 					git -c grep.patternType=$engine -c grep.threads=$threads grep$GIT_PERF_7820_GREP_OPTS -- '$pattern' >'out.$engine.$threads' || :
 				"
 			done
diff --git a/t/perf/p7822-grep-perl-character.sh b/t/perf/p7822-grep-perl-character.sh
new file mode 100755
index 0000000..87009c6
--- /dev/null
+++ b/t/perf/p7822-grep-perl-character.sh
@@ -0,0 +1,42 @@
+#!/bin/sh
+
+test_description="git-grep's perl regex
+
+If GIT_PERF_GREP_THREADS is set to a list of threads (e.g. '1 4 8'
+etc.) we will test the patterns under those numbers of threads.
+"
+
+. ./perf-lib.sh
+
+test_perf_large_repo
+test_checkout_worktree
+
+if test -n "$GIT_PERF_GREP_THREADS"
+then
+	test_set_prereq PERF_GREP_ENGINES_THREADS
+fi
+
+for pattern in \
+	'\\bhow' \
+	'\\bÆvar' \
+	'\\d+ \\bÆvar' \
+	'\\bBelón\\b' \
+	'\\w{12}\\b'
+do
+	echo '$pattern' >pat
+	if ! test_have_prereq PERF_GREP_ENGINES_THREADS
+	then
+		test_perf "grep -P '$pattern'" --prereq PCRE "
+			git -P grep -f pat || :
+		"
+	else
+		for threads in $GIT_PERF_GREP_THREADS
+		do
+			test_perf "grep -P '$pattern' with $threads threads" --prereq PTHREADS,PCRE "
+				git -c grep.threads=$threads -P grep -f pat || :
+			"
+		done
+	fi
+done
+
+test_done
diff --git a/t/perf/p9210-scalar.sh b/t/perf/p9210-scalar.sh
new file mode 100755
index 0000000..265f7cd
--- /dev/null
+++ b/t/perf/p9210-scalar.sh
@@ -0,0 +1,39 @@
+#!/bin/sh
+
+test_description='test scalar performance'
+. ./perf-lib.sh
+
+test_perf_large_repo "$TRASH_DIRECTORY/to-clone"
+
+test_expect_success 'enable server-side partial clone' '
+	git -C to-clone config uploadpack.allowFilter true &&
+	git -C to-clone config uploadpack.allowAnySHA1InWant true
+'
+
+test_perf 'scalar clone' '
+	rm -rf scalar-clone &&
+	scalar clone "file://$(pwd)/to-clone" scalar-clone
+'
+
+test_perf 'git clone' '
+	rm -rf git-clone &&
+	git clone "file://$(pwd)/to-clone" git-clone
+'
+
+test_compare_perf () {
+	command=$1
+	shift
+	args=$*
+	test_perf "$command $args (scalar)" "
+		$command -C scalar-clone/src $args
+	"
+
+	test_perf "$command $args (non-scalar)" "
+		$command -C git-clone $args
+	"
+}
+
+test_compare_perf git status
+test_compare_perf test_commit --append --no-tag A
+
+test_done
diff --git a/t/perf/perf-lib.sh b/t/perf/perf-lib.sh
index 13e3893..ab0c763 100644
--- a/t/perf/perf-lib.sh
+++ b/t/perf/perf-lib.sh
@@ -15,7 +15,7 @@
 # GNU General Public License for more details.
 #
 # You should have received a copy of the GNU General Public License
-# along with this program.  If not, see http://www.gnu.org/licenses/ .
+# along with this program.  If not, see https://www.gnu.org/licenses/ .
 
 # These variables must be set before the inclusion of test-lib.sh below,
 # because it will change our working directory.
@@ -27,7 +27,11 @@ TEST_NO_MALLOC_CHECK=t
 
 . ../test-lib.sh
 
-if test -n "$GIT_TEST_INSTALLED" -a -z "$PERF_SET_GIT_TEST_INSTALLED"
+unset GIT_CONFIG_NOSYSTEM
+GIT_CONFIG_SYSTEM="$TEST_DIRECTORY/perf/config"
+export GIT_CONFIG_SYSTEM
+
+if test -n "$GIT_TEST_INSTALLED" && test -z "$PERF_SET_GIT_TEST_INSTALLED"
 then
 	error "Do not use GIT_TEST_INSTALLED with the perf tests.
 
@@ -45,7 +49,10 @@ export TEST_DIRECTORY TRASH_DIRECTORY GIT_BUILD_DIR GIT_TEST_CMP
 MODERN_GIT=$GIT_BUILD_DIR/bin-wrappers/git
 export MODERN_GIT
 
-perf_results_dir=$TEST_OUTPUT_DIRECTORY/test-results
+MODERN_SCALAR=$GIT_BUILD_DIR/bin-wrappers/scalar
+export MODERN_SCALAR
+
+perf_results_dir=$TEST_RESULTS_DIR
 test -n "$GIT_PERF_SUBSECTION" && perf_results_dir="$perf_results_dir/$GIT_PERF_SUBSECTION"
 mkdir -p "$perf_results_dir"
 rm -f "$perf_results_dir"/$(basename "$0" .sh).subtests
@@ -70,6 +77,19 @@ test_perf_do_repo_symlink_config_ () {
 	test_have_prereq SYMLINKS || git config core.symlinks false
 }
 
+test_perf_copy_repo_contents () {
+	for stuff in "$1"/*
+	do
+		case "$stuff" in
+		*/objects|*/hooks|*/config|*/commondir|*/gitdir|*/worktrees|*/fsmonitor--daemon*)
+			;;
+		*)
+			cp -R "$stuff" "$repo/.git/" || exit 1
+			;;
+		esac
+	done
+}
+
 test_perf_create_repo_from () {
 	test "$#" = 2 ||
 	BUG "not 2 parameters to test-create-repo"
@@ -77,20 +97,20 @@ test_perf_create_repo_from () {
 	source="$2"
 	source_git="$("$MODERN_GIT" -C "$source" rev-parse --git-dir)"
 	objects_dir="$("$MODERN_GIT" -C "$source" rev-parse --git-path objects)"
+	common_dir="$("$MODERN_GIT" -C "$source" rev-parse --git-common-dir)"
 	mkdir -p "$repo/.git"
 	(
 		cd "$source" &&
 		{ cp -Rl "$objects_dir" "$repo/.git/" 2>/dev/null ||
 			cp -R "$objects_dir" "$repo/.git/"; } &&
-		for stuff in "$source_git"/*; do
-			case "$stuff" in
-				*/objects|*/hooks|*/config|*/commondir)
-					;;
-				*)
-					cp -R "$stuff" "$repo/.git/" || exit 1
-					;;
-			esac
-		done
+
+		# common_dir must come first here, since we want source_git to
+		# take precedence and overwrite any overlapping files
+		test_perf_copy_repo_contents "$common_dir"
+		if test "$source_git" != "$common_dir"
+		then
+			test_perf_copy_repo_contents "$source_git"
+		fi
 	) &&
 	(
 		cd "$repo" &&
@@ -103,6 +123,10 @@ test_perf_create_repo_from () {
 			# status" due to a locked index. Since we have
 			# a copy it's fine to remove the lock.
 			rm .git/index.lock
+		fi &&
+		if test_bool_env GIT_PERF_USE_SCALAR false
+		then
+			"$MODERN_SCALAR" register
 		fi
 	) || error "failed to copy repository '$source' to '$repo'"
 }
@@ -113,7 +137,11 @@ test_perf_fresh_repo () {
 	"$MODERN_GIT" init -q "$repo" &&
 	(
 		cd "$repo" &&
-		test_perf_do_repo_symlink_config_
+		test_perf_do_repo_symlink_config_ &&
+		if test_bool_env GIT_PERF_USE_SCALAR false
+		then
+			"$MODERN_SCALAR" register
+		fi
 	)
 }
 
@@ -144,17 +172,19 @@ test_run_perf_ () {
 	test_cleanup=:
 	test_export_="test_cleanup"
 	export test_cleanup test_export_
-	"$GTIME" -f "%E %U %S" -o test_time.$i "$SHELL" -c '
+	"$GTIME" -f "%E %U %S" -o test_time.$i "$TEST_SHELL_PATH" -c '
 . '"$TEST_DIRECTORY"/test-lib-functions.sh'
 test_export () {
-	[ $# != 0 ] || return 0
-	test_export_="$test_export_\\|$1"
-	shift
-	test_export "$@"
+	test_export_="$test_export_ $*"
 }
 '"$1"'
 ret=$?
-set | sed -n "s'"/'/'\\\\''/g"';s/^\\($test_export_\\)/export '"'&'"'/p" >test_vars
+needles=
+for v in $test_export_
+do
+	needles="$needles;s/^$v=/export $v=/p"
+done
+set | sed -n "s'"/'/'\\\\''/g"'$needles" >test_vars
 exit $ret' >&3 2>&4
 	eval_ret=$?
 
@@ -170,19 +200,39 @@ exit $ret' >&3 2>&4
 }
 
 test_wrapper_ () {
-	test_wrapper_func_=$1; shift
+	local test_wrapper_func_="$1"; shift
+	local test_title_="$1"; shift
 	test_start_
-	test "$#" = 3 && { test_prereq=$1; shift; } || test_prereq=
-	test "$#" = 2 ||
-	BUG "not 2 or 3 parameters to test-expect-success"
+	test_prereq=
+	test_perf_setup_=
+	while test $# != 0
+	do
+		case $1 in
+		--prereq)
+			test_prereq=$2
+			shift
+			;;
+		--setup)
+			test_perf_setup_=$2
+			shift
+			;;
+		*)
+			break
+			;;
+		esac
+		shift
+	done
+	test "$#" = 1 || BUG "test_wrapper_ needs 2 positional parameters"
 	export test_prereq
-	if ! test_skip "$@"
+	export test_perf_setup_
+
+	if ! test_skip "$test_title_" "$@"
 	then
 		base=$(basename "$0" .sh)
 		echo "$test_count" >>"$perf_results_dir"/$base.subtests
-		echo "$1" >"$perf_results_dir"/$base.$test_count.descr
+		echo "$test_title_" >"$perf_results_dir"/$base.$test_count.descr
 		base="$perf_results_dir"/"$PERF_RESULTS_PREFIX$(basename "$0" .sh)"."$test_count"
-		"$test_wrapper_func_" "$@"
+		"$test_wrapper_func_" "$test_title_" "$@"
 	fi
 
 	test_finish_
@@ -195,6 +245,16 @@ test_perf_ () {
 		echo "perf $test_count - $1:"
 	fi
 	for i in $(test_seq 1 $GIT_PERF_REPEAT_COUNT); do
+		if test -n "$test_perf_setup_"
+		then
+			say >&3 "setup: $test_perf_setup_"
+			if ! test_eval_ $test_perf_setup_
+			then
+				test_failure_ "$test_perf_setup_"
+				break
+			fi
+
+		fi
 		say >&3 "running: $2"
 		if test_run_perf_ "$2"
 		then
@@ -215,13 +275,27 @@ test_perf_ () {
 		test_ok_ "$1"
 	fi
 	"$TEST_DIRECTORY"/perf/min_time.perl test_time.* >"$base".result
+	rm test_time.*
 }
 
+# Usage: test_perf 'title' [options] 'perf-test'
+#	Run the performance test script specified in perf-test with
+#	optional prerequisite and setup steps.
+# Options:
+#	--prereq prerequisites: Skip the test if prequisites aren't met
+#	--setup "setup-steps": Run setup steps prior to each measured iteration
+#
 test_perf () {
 	test_wrapper_ test_perf_ "$@"
 }
 
 test_size_ () {
+	if test -n "$test_perf_setup_"
+	then
+		say >&3 "setup: $test_perf_setup_"
+		test_eval_ $test_perf_setup_
+	fi
+
 	say >&3 "running: $2"
 	if test_eval_ "$2" 3>"$base".result; then
 		test_ok_ "$1"
@@ -230,6 +304,14 @@ test_size_ () {
 	fi
 }
 
+# Usage: test_size 'title' [options] 'size-test'
+#	Run the size test script specified in size-test with optional
+#	prerequisites and setup steps. Returns the numeric value
+#	returned by size-test.
+# Options:
+#	--prereq prerequisites: Skip the test if prequisites aren't met
+#	--setup "setup-steps": Run setup steps prior to the size measurement
+
 test_size () {
 	test_wrapper_ test_size_ "$@"
 }
@@ -238,10 +320,15 @@ test_size () {
 # and does it after running everything)
 test_at_end_hook_ () {
 	if test -z "$GIT_PERF_AGGREGATING_LATER"; then
-		( cd "$TEST_DIRECTORY"/perf && ./aggregate.perl $(basename "$0") )
+		(
+			cd "$TEST_DIRECTORY"/perf &&
+			./aggregate.perl --results-dir="$TEST_RESULTS_DIR" $(basename "$0")
+		)
 	fi
 }
 
 test_export () {
 	export "$@"
 }
+
+test_lazy_prereq PERF_EXTRA 'test_bool_env GIT_PERF_EXTRA false'
diff --git a/t/perf/repos/inflate-repo.sh b/t/perf/repos/inflate-repo.sh
index fcfc992..412e4b4 100755
--- a/t/perf/repos/inflate-repo.sh
+++ b/t/perf/repos/inflate-repo.sh
@@ -33,7 +33,7 @@ do
 done
 
 git ls-tree -r HEAD >GEN_src_list
-nr_src_files=$(cat GEN_src_list | wc -l)
+nr_src_files=$(wc -l <GEN_src_list)
 
 src_branch=$(git symbolic-ref --short HEAD)
 
diff --git a/t/perf/run b/t/perf/run
index c7b8610..486ead2 100755
--- a/t/perf/run
+++ b/t/perf/run
@@ -74,7 +74,7 @@ set_git_test_installed () {
 	mydir=$1
 
 	mydir_abs=$(cd $mydir && pwd)
-	mydir_abs_wrappers="$mydir_abs_wrappers/bin-wrappers"
+	mydir_abs_wrappers="$mydir_abs/bin-wrappers"
 	if test -d "$mydir_abs_wrappers"
 	then
 		GIT_TEST_INSTALLED=$mydir_abs_wrappers
@@ -91,10 +91,10 @@ set_git_test_installed () {
 run_dirs_helper () {
 	mydir=${1%/}
 	shift
-	while test $# -gt 0 -a "$1" != -- -a ! -f "$1"; do
+	while test $# -gt 0 && test "$1" != -- && test ! -f "$1"; do
 		shift
 	done
-	if test $# -gt 0 -a "$1" = --; then
+	if test $# -gt 0 && test "$1" = --; then
 		shift
 	fi
 
@@ -124,7 +124,7 @@ run_dirs_helper () {
 }
 
 run_dirs () {
-	while test $# -gt 0 -a "$1" != -- -a ! -f "$1"; do
+	while test $# -gt 0 && test "$1" != -- && test ! -f "$1"; do
 		run_dirs_helper "$@"
 		shift
 	done
@@ -171,13 +171,17 @@ run_subsection () {
 	get_var_from_env_or_config "GIT_PERF_MAKE_COMMAND" "perf" "makeCommand"
 	get_var_from_env_or_config "GIT_PERF_MAKE_OPTS" "perf" "makeOpts"
 
+	get_var_from_env_or_config "GIT_PERF_USE_SCALAR" "perf" "useScalar" "--bool"
+	export GIT_PERF_USE_SCALAR
+
 	get_var_from_env_or_config "GIT_PERF_REPO_NAME" "perf" "repoName"
 	export GIT_PERF_REPO_NAME
 
 	GIT_PERF_AGGREGATING_LATER=t
 	export GIT_PERF_AGGREGATING_LATER
 
-	if test $# = 0 -o "$1" = -- -o -f "$1"; then
+	if test $# = 0 || test "$1" = -- || test -f "$1"
+	then
 		set -- . "$@"
 	fi
 
@@ -188,10 +192,10 @@ run_subsection () {
 
 	if test -z "$GIT_PERF_SEND_TO_CODESPEED"
 	then
-		./aggregate.perl $codespeed_opt "$@"
+		./aggregate.perl --results-dir="$TEST_RESULTS_DIR" $codespeed_opt "$@"
 	else
-		json_res_file="test-results/$GIT_PERF_SUBSECTION/aggregate.json"
-		./aggregate.perl --codespeed "$@" | tee "$json_res_file"
+		json_res_file=""$TEST_RESULTS_DIR"/$GIT_PERF_SUBSECTION/aggregate.json"
+		./aggregate.perl --results-dir="$TEST_RESULTS_DIR" --codespeed "$@" | tee "$json_res_file"
 		send_data_url="$GIT_PERF_SEND_TO_CODESPEED/result/add/json/"
 		curl -v --request POST --data-urlencode "json=$(cat "$json_res_file")" "$send_data_url"
 	fi
@@ -203,10 +207,17 @@ get_var_from_env_or_config "GIT_PERF_SEND_TO_CODESPEED" "perf" "sendToCodespeed"
 cd "$(dirname $0)"
 . ../../GIT-BUILD-OPTIONS
 
-mkdir -p test-results
-get_subsections "perf" >test-results/run_subsections.names
+if test -n "$TEST_OUTPUT_DIRECTORY"
+then
+	TEST_RESULTS_DIR="$TEST_OUTPUT_DIRECTORY/test-results"
+else
+	TEST_RESULTS_DIR=test-results
+fi
+
+mkdir -p "$TEST_RESULTS_DIR"
+get_subsections "perf" >"$TEST_RESULTS_DIR"/run_subsections.names
 
-if test $(wc -l <test-results/run_subsections.names) -eq 0
+if test $(wc -l <"$TEST_RESULTS_DIR"/run_subsections.names) -eq 0
 then
 	if test -n "$GIT_PERF_SUBSECTION"
 	then
@@ -222,10 +233,10 @@ then
 	)
 elif test -n "$GIT_PERF_SUBSECTION"
 then
-	egrep "^$GIT_PERF_SUBSECTION\$" test-results/run_subsections.names >/dev/null ||
+	grep -E "^$GIT_PERF_SUBSECTION\$" "$TEST_RESULTS_DIR"/run_subsections.names >/dev/null ||
 		die "subsection '$GIT_PERF_SUBSECTION' not found in '$GIT_PERF_CONFIG_FILE'"
 
-	egrep "^$GIT_PERF_SUBSECTION\$" test-results/run_subsections.names | while read -r subsec
+	grep -E "^$GIT_PERF_SUBSECTION\$" "$TEST_RESULTS_DIR"/run_subsections.names | while read -r subsec
 	do
 		(
 			GIT_PERF_SUBSECTION="$subsec"
@@ -243,5 +254,5 @@ else
 			echo "======== Run for subsection '$GIT_PERF_SUBSECTION' ========"
 			run_subsection "$@"
 		)
-	done <test-results/run_subsections.names
+	done <"$TEST_RESULTS_DIR"/run_subsections.names
 fi
diff --git a/t/t0000-basic.sh b/t/t0000-basic.sh
index 923281a..6e300be 100755
--- a/t/t0000-basic.sh
+++ b/t/t0000-basic.sh
@@ -19,6 +19,7 @@ modification *should* take notice and update the test vectors here.
 '
 
 . ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-subtest.sh
 
 try_local_xy () {
 	local x="local" y="alsolocal" &&
@@ -66,101 +67,31 @@ test_expect_success 'success is reported like this' '
 	:
 '
 
-_run_sub_test_lib_test_common () {
-	neg="$1" name="$2" descr="$3" # stdin is the body of the test code
-	shift 3
-	mkdir "$name" &&
-	(
-		# Pretend we're not running under a test harness, whether we
-		# are or not. The test-lib output depends on the setting of
-		# this variable, so we need a stable setting under which to run
-		# the sub-test.
-		sane_unset HARNESS_ACTIVE &&
-		cd "$name" &&
-		write_script "$name.sh" "$TEST_SHELL_PATH" <<-EOF &&
-		test_description='$descr (run in sub test-lib)
-
-		This is run in a sub test-lib so that we do not get incorrect
-		passing metrics
-		'
-
-		# Tell the framework that we are self-testing to make sure
-		# it yields a stable result.
-		GIT_TEST_FRAMEWORK_SELFTEST=t &&
-
-		# Point to the t/test-lib.sh, which isn't in ../ as usual
-		. "\$TEST_DIRECTORY"/test-lib.sh
-		EOF
-		cat >>"$name.sh" &&
-		export TEST_DIRECTORY &&
-		TEST_OUTPUT_DIRECTORY=$(pwd) &&
-		export TEST_OUTPUT_DIRECTORY &&
-		sane_unset GIT_TEST_FAIL_PREREQS &&
-		if test -z "$neg"
-		then
-			./"$name.sh" "$@" >out 2>err
-		else
-			! ./"$name.sh" "$@" >out 2>err
-		fi
-	)
-}
-
-run_sub_test_lib_test () {
-	_run_sub_test_lib_test_common '' "$@"
-}
-
-run_sub_test_lib_test_err () {
-	_run_sub_test_lib_test_common '!' "$@"
-}
-
-check_sub_test_lib_test () {
-	name="$1" # stdin is the expected output from the test
-	(
-		cd "$name" &&
-		test_must_be_empty err &&
-		sed -e 's/^> //' -e 's/Z$//' >expect &&
-		test_cmp expect out
-	)
-}
-
-check_sub_test_lib_test_err () {
-	name="$1" # stdin is the expected output from the test
-	# expected error output is in descriptor 3
-	(
-		cd "$name" &&
-		sed -e 's/^> //' -e 's/Z$//' >expect.out &&
-		test_cmp expect.out out &&
-		sed -e 's/^> //' -e 's/Z$//' <&3 >expect.err &&
-		test_cmp expect.err err
-	)
-}
-
-test_expect_success 'pretend we have a fully passing test suite' "
-	run_sub_test_lib_test full-pass '3 passing tests' <<-\\EOF &&
+test_expect_success 'subtest: 3 passing tests' '
+	write_and_run_sub_test_lib_test full-pass <<-\EOF &&
 	for i in 1 2 3
 	do
-		test_expect_success \"passing test #\$i\" 'true'
+		test_expect_success "passing test #$i" "true"
 	done
 	test_done
 	EOF
-	check_sub_test_lib_test full-pass <<-\\EOF
+	check_sub_test_lib_test full-pass <<-\EOF
 	> ok 1 - passing test #1
 	> ok 2 - passing test #2
 	> ok 3 - passing test #3
 	> # passed all 3 test(s)
 	> 1..3
 	EOF
-"
+'
 
-test_expect_success 'pretend we have a partially passing test suite' "
-	run_sub_test_lib_test_err \
-		partial-pass '2/3 tests passing' <<-\\EOF &&
-	test_expect_success 'passing test #1' 'true'
-	test_expect_success 'failing test #2' 'false'
-	test_expect_success 'passing test #3' 'true'
+test_expect_success 'subtest: 2/3 tests passing' '
+	write_and_run_sub_test_lib_test_err partial-pass <<-\EOF &&
+	test_expect_success "passing test #1" "true"
+	test_expect_success "failing test #2" "false"
+	test_expect_success "passing test #3" "true"
 	test_done
 	EOF
-	check_sub_test_lib_test partial-pass <<-\\EOF
+	check_sub_test_lib_test partial-pass <<-\EOF
 	> ok 1 - passing test #1
 	> not ok 2 - failing test #2
 	#	false
@@ -168,44 +99,56 @@ test_expect_success 'pretend we have a partially passing test suite' "
 	> # failed 1 among 3 test(s)
 	> 1..3
 	EOF
-"
+'
+
+test_expect_success 'subtest: --immediate' '
+	run_sub_test_lib_test_err partial-pass \
+		--immediate &&
+	check_sub_test_lib_test_err partial-pass \
+		<<-\EOF_OUT 3<<-EOF_ERR
+	> ok 1 - passing test #1
+	> not ok 2 - failing test #2
+	> #	false
+	> 1..2
+	EOF_OUT
+	EOF_ERR
+'
 
-test_expect_success 'pretend we have a known breakage' "
-	run_sub_test_lib_test failing-todo 'A failing TODO test' <<-\\EOF &&
-	test_expect_success 'passing test' 'true'
-	test_expect_failure 'pretend we have a known breakage' 'false'
+test_expect_success 'subtest: a failing TODO test' '
+	write_and_run_sub_test_lib_test failing-todo <<-\EOF &&
+	test_expect_success "passing test" "true"
+	test_expect_failure "pretend we have a known breakage" "false"
 	test_done
 	EOF
-	check_sub_test_lib_test failing-todo <<-\\EOF
+	check_sub_test_lib_test failing-todo <<-\EOF
 	> ok 1 - passing test
 	> not ok 2 - pretend we have a known breakage # TODO known breakage
 	> # still have 1 known breakage(s)
 	> # passed all remaining 1 test(s)
 	> 1..2
 	EOF
-"
+'
 
-test_expect_success 'pretend we have fixed a known breakage' "
-	run_sub_test_lib_test passing-todo 'A passing TODO test' <<-\\EOF &&
-	test_expect_failure 'pretend we have fixed a known breakage' 'true'
+test_expect_success 'subtest: a passing TODO test' '
+	write_and_run_sub_test_lib_test passing-todo <<-\EOF &&
+	test_expect_failure "pretend we have fixed a known breakage" "true"
 	test_done
 	EOF
-	check_sub_test_lib_test passing-todo <<-\\EOF
+	check_sub_test_lib_test passing-todo <<-\EOF
 	> ok 1 - pretend we have fixed a known breakage # TODO known breakage vanished
 	> # 1 known breakage(s) vanished; please update test(s)
 	> 1..1
 	EOF
-"
-
-test_expect_success 'pretend we have fixed one of two known breakages (run in sub test-lib)' "
-	run_sub_test_lib_test partially-passing-todos \
-		'2 TODO tests, one passing' <<-\\EOF &&
-	test_expect_failure 'pretend we have a known breakage' 'false'
-	test_expect_success 'pretend we have a passing test' 'true'
-	test_expect_failure 'pretend we have fixed another known breakage' 'true'
+'
+
+test_expect_success 'subtest: 2 TODO tests, one passin' '
+	write_and_run_sub_test_lib_test partially-passing-todos <<-\EOF &&
+	test_expect_failure "pretend we have a known breakage" "false"
+	test_expect_success "pretend we have a passing test" "true"
+	test_expect_failure "pretend we have fixed another known breakage" "true"
 	test_done
 	EOF
-	check_sub_test_lib_test partially-passing-todos <<-\\EOF
+	check_sub_test_lib_test partially-passing-todos <<-\EOF
 	> not ok 1 - pretend we have a known breakage # TODO known breakage
 	> ok 2 - pretend we have a passing test
 	> ok 3 - pretend we have fixed another known breakage # TODO known breakage vanished
@@ -214,17 +157,16 @@ test_expect_success 'pretend we have fixed one of two known breakages (run in su
 	> # passed all remaining 1 test(s)
 	> 1..3
 	EOF
-"
+'
 
-test_expect_success 'pretend we have a pass, fail, and known breakage' "
-	run_sub_test_lib_test_err \
-		mixed-results1 'mixed results #1' <<-\\EOF &&
-	test_expect_success 'passing test' 'true'
-	test_expect_success 'failing test' 'false'
-	test_expect_failure 'pretend we have a known breakage' 'false'
+test_expect_success 'subtest: mixed results: pass, failure and a TODO test' '
+	write_and_run_sub_test_lib_test_err mixed-results1 <<-\EOF &&
+	test_expect_success "passing test" "true"
+	test_expect_success "failing test" "false"
+	test_expect_failure "pretend we have a known breakage" "false"
 	test_done
 	EOF
-	check_sub_test_lib_test mixed-results1 <<-\\EOF
+	check_sub_test_lib_test mixed-results1 <<-\EOF
 	> ok 1 - passing test
 	> not ok 2 - failing test
 	> #	false
@@ -233,24 +175,23 @@ test_expect_success 'pretend we have a pass, fail, and known breakage' "
 	> # failed 1 among remaining 2 test(s)
 	> 1..3
 	EOF
-"
+'
 
-test_expect_success 'pretend we have a mix of all possible results' "
-	run_sub_test_lib_test_err \
-		mixed-results2 'mixed results #2' <<-\\EOF &&
-	test_expect_success 'passing test' 'true'
-	test_expect_success 'passing test' 'true'
-	test_expect_success 'passing test' 'true'
-	test_expect_success 'passing test' 'true'
-	test_expect_success 'failing test' 'false'
-	test_expect_success 'failing test' 'false'
-	test_expect_success 'failing test' 'false'
-	test_expect_failure 'pretend we have a known breakage' 'false'
-	test_expect_failure 'pretend we have a known breakage' 'false'
-	test_expect_failure 'pretend we have fixed a known breakage' 'true'
+test_expect_success 'subtest: mixed results: a mixture of all possible results' '
+	write_and_run_sub_test_lib_test_err mixed-results2 <<-\EOF &&
+	test_expect_success "passing test" "true"
+	test_expect_success "passing test" "true"
+	test_expect_success "passing test" "true"
+	test_expect_success "passing test" "true"
+	test_expect_success "failing test" "false"
+	test_expect_success "failing test" "false"
+	test_expect_success "failing test" "false"
+	test_expect_failure "pretend we have a known breakage" "false"
+	test_expect_failure "pretend we have a known breakage" "false"
+	test_expect_failure "pretend we have fixed a known breakage" "true"
 	test_done
 	EOF
-	check_sub_test_lib_test mixed-results2 <<-\\EOF
+	check_sub_test_lib_test mixed-results2 <<-\EOF
 	> ok 1 - passing test
 	> ok 2 - passing test
 	> ok 3 - passing test
@@ -269,11 +210,10 @@ test_expect_success 'pretend we have a mix of all possible results' "
 	> # failed 3 among remaining 7 test(s)
 	> 1..10
 	EOF
-"
+'
 
-test_expect_success C_LOCALE_OUTPUT 'test --verbose' '
-	run_sub_test_lib_test_err \
-		t1234-verbose "test verbose" --verbose <<-\EOF &&
+test_expect_success 'subtest: --verbose option' '
+	write_and_run_sub_test_lib_test_err t1234-verbose --verbose <<-\EOF &&
 	test_expect_success "passing test" true
 	test_expect_success "test with output" "echo foo"
 	test_expect_success "failing test" false
@@ -298,19 +238,14 @@ test_expect_success C_LOCALE_OUTPUT 'test --verbose' '
 	EOF
 '
 
-test_expect_success 'test --verbose-only' '
+test_expect_success 'subtest: --verbose-only option' '
 	run_sub_test_lib_test_err \
-		t2345-verbose-only-2 "test verbose-only=2" \
-		--verbose-only=2 <<-\EOF &&
-	test_expect_success "passing test" true
-	test_expect_success "test with output" "echo foo"
-	test_expect_success "failing test" false
-	test_done
-	EOF
-	check_sub_test_lib_test t2345-verbose-only-2 <<-\EOF
+		t1234-verbose \
+		--verbose-only=2 &&
+	check_sub_test_lib_test t1234-verbose <<-\EOF
 	> ok 1 - passing test
 	> Z
-	> expecting success of 2345.2 '\''test with output'\'': echo foo
+	> expecting success of 1234.2 '\''test with output'\'': echo foo
 	> foo
 	> ok 2 - test with output
 	> Z
@@ -321,18 +256,11 @@ test_expect_success 'test --verbose-only' '
 	EOF
 '
 
-test_expect_success 'GIT_SKIP_TESTS' "
+test_expect_success 'subtest: skip one with GIT_SKIP_TESTS' '
 	(
-		GIT_SKIP_TESTS='git.2' && export GIT_SKIP_TESTS &&
-		run_sub_test_lib_test git-skip-tests-basic \
-			'GIT_SKIP_TESTS' <<-\\EOF &&
-		for i in 1 2 3
-		do
-			test_expect_success \"passing test #\$i\" 'true'
-		done
-		test_done
-		EOF
-		check_sub_test_lib_test git-skip-tests-basic <<-\\EOF
+		run_sub_test_lib_test full-pass \
+			--skip="full.2" &&
+		check_sub_test_lib_test full-pass <<-\EOF
 		> ok 1 - passing test #1
 		> ok 2 # skip passing test #2 (GIT_SKIP_TESTS)
 		> ok 3 - passing test #3
@@ -340,20 +268,19 @@ test_expect_success 'GIT_SKIP_TESTS' "
 		> 1..3
 		EOF
 	)
-"
+'
 
-test_expect_success 'GIT_SKIP_TESTS several tests' "
+test_expect_success 'subtest: skip several with GIT_SKIP_TESTS' '
 	(
-		GIT_SKIP_TESTS='git.2 git.5' && export GIT_SKIP_TESTS &&
-		run_sub_test_lib_test git-skip-tests-several \
-			'GIT_SKIP_TESTS several tests' <<-\\EOF &&
+		write_and_run_sub_test_lib_test git-skip-tests-several \
+			--skip="git.2 git.5" <<-\EOF &&
 		for i in 1 2 3 4 5 6
 		do
-			test_expect_success \"passing test #\$i\" 'true'
+			test_expect_success "passing test #$i" "true"
 		done
 		test_done
 		EOF
-		check_sub_test_lib_test git-skip-tests-several <<-\\EOF
+		check_sub_test_lib_test git-skip-tests-several <<-\EOF
 		> ok 1 - passing test #1
 		> ok 2 # skip passing test #2 (GIT_SKIP_TESTS)
 		> ok 3 - passing test #3
@@ -364,20 +291,13 @@ test_expect_success 'GIT_SKIP_TESTS several tests' "
 		> 1..6
 		EOF
 	)
-"
+'
 
-test_expect_success 'GIT_SKIP_TESTS sh pattern' "
+test_expect_success 'subtest: sh pattern skipping with GIT_SKIP_TESTS' '
 	(
-		GIT_SKIP_TESTS='git.[2-5]' && export GIT_SKIP_TESTS &&
-		run_sub_test_lib_test git-skip-tests-sh-pattern \
-			'GIT_SKIP_TESTS sh pattern' <<-\\EOF &&
-		for i in 1 2 3 4 5 6
-		do
-			test_expect_success \"passing test #\$i\" 'true'
-		done
-		test_done
-		EOF
-		check_sub_test_lib_test git-skip-tests-sh-pattern <<-\\EOF
+		run_sub_test_lib_test git-skip-tests-several \
+			--skip="git.[2-5]" &&
+		check_sub_test_lib_test git-skip-tests-several <<-\EOF
 		> ok 1 - passing test #1
 		> ok 2 # skip passing test #2 (GIT_SKIP_TESTS)
 		> ok 3 # skip passing test #3 (GIT_SKIP_TESTS)
@@ -388,37 +308,25 @@ test_expect_success 'GIT_SKIP_TESTS sh pattern' "
 		> 1..6
 		EOF
 	)
-"
+'
 
-test_expect_success 'GIT_SKIP_TESTS entire suite' "
+test_expect_success 'subtest: skip entire test suite with GIT_SKIP_TESTS' '
 	(
-		GIT_SKIP_TESTS='git' && export GIT_SKIP_TESTS &&
-		run_sub_test_lib_test git-skip-tests-entire-suite \
-			'GIT_SKIP_TESTS entire suite' <<-\\EOF &&
-		for i in 1 2 3
-		do
-			test_expect_success \"passing test #\$i\" 'true'
-		done
-		test_done
-		EOF
-		check_sub_test_lib_test git-skip-tests-entire-suite <<-\\EOF
+		GIT_SKIP_TESTS="git" && export GIT_SKIP_TESTS &&
+		run_sub_test_lib_test git-skip-tests-several \
+			--skip="git" &&
+		check_sub_test_lib_test git-skip-tests-several <<-\EOF
 		> 1..0 # SKIP skip all tests in git
 		EOF
 	)
-"
+'
 
-test_expect_success 'GIT_SKIP_TESTS does not skip unmatched suite' "
+test_expect_success 'subtest: GIT_SKIP_TESTS does not skip unmatched suite' '
 	(
-		GIT_SKIP_TESTS='notgit' && export GIT_SKIP_TESTS &&
-		run_sub_test_lib_test git-skip-tests-unmatched-suite \
-			'GIT_SKIP_TESTS does not skip unmatched suite' <<-\\EOF &&
-		for i in 1 2 3
-		do
-			test_expect_success \"passing test #\$i\" 'true'
-		done
-		test_done
-		EOF
-		check_sub_test_lib_test git-skip-tests-unmatched-suite <<-\\EOF
+		GIT_SKIP_TESTS="notgit" && export GIT_SKIP_TESTS &&
+		run_sub_test_lib_test full-pass \
+			--skip="notfull" &&
+		check_sub_test_lib_test full-pass <<-\EOF
 		> ok 1 - passing test #1
 		> ok 2 - passing test #2
 		> ok 3 - passing test #3
@@ -426,18 +334,11 @@ test_expect_success 'GIT_SKIP_TESTS does not skip unmatched suite' "
 		> 1..3
 		EOF
 	)
-"
+'
 
-test_expect_success '--run basic' "
-	run_sub_test_lib_test run-basic \
-		'--run basic' --run='1 3 5' <<-\\EOF &&
-	for i in 1 2 3 4 5 6
-	do
-		test_expect_success \"passing test #\$i\" 'true'
-	done
-	test_done
-	EOF
-	check_sub_test_lib_test run-basic <<-\\EOF
+test_expect_success 'subtest: --run basic' '
+	run_sub_test_lib_test git-skip-tests-several --run="1,3,5" &&
+	check_sub_test_lib_test git-skip-tests-several <<-\EOF
 	> ok 1 - passing test #1
 	> ok 2 # skip passing test #2 (--run)
 	> ok 3 - passing test #3
@@ -447,18 +348,12 @@ test_expect_success '--run basic' "
 	> # passed all 6 test(s)
 	> 1..6
 	EOF
-"
+'
 
-test_expect_success '--run with a range' "
-	run_sub_test_lib_test run-range \
-		'--run with a range' --run='1-3' <<-\\EOF &&
-	for i in 1 2 3 4 5 6
-	do
-		test_expect_success \"passing test #\$i\" 'true'
-	done
-	test_done
-	EOF
-	check_sub_test_lib_test run-range <<-\\EOF
+test_expect_success 'subtest: --run with a range' '
+	run_sub_test_lib_test git-skip-tests-several \
+		--run="1-3" &&
+	check_sub_test_lib_test git-skip-tests-several <<-\EOF
 	> ok 1 - passing test #1
 	> ok 2 - passing test #2
 	> ok 3 - passing test #3
@@ -468,18 +363,12 @@ test_expect_success '--run with a range' "
 	> # passed all 6 test(s)
 	> 1..6
 	EOF
-"
+'
 
-test_expect_success '--run with two ranges' "
-	run_sub_test_lib_test run-two-ranges \
-		'--run with two ranges' --run='1-2 5-6' <<-\\EOF &&
-	for i in 1 2 3 4 5 6
-	do
-		test_expect_success \"passing test #\$i\" 'true'
-	done
-	test_done
-	EOF
-	check_sub_test_lib_test run-two-ranges <<-\\EOF
+test_expect_success 'subtest: --run with two ranges' '
+	run_sub_test_lib_test git-skip-tests-several \
+		--run="1-2,5-6" &&
+	check_sub_test_lib_test git-skip-tests-several <<-\EOF
 	> ok 1 - passing test #1
 	> ok 2 - passing test #2
 	> ok 3 # skip passing test #3 (--run)
@@ -489,18 +378,12 @@ test_expect_success '--run with two ranges' "
 	> # passed all 6 test(s)
 	> 1..6
 	EOF
-"
+'
 
-test_expect_success '--run with a left open range' "
-	run_sub_test_lib_test run-left-open-range \
-		'--run with a left open range' --run='-3' <<-\\EOF &&
-	for i in 1 2 3 4 5 6
-	do
-		test_expect_success \"passing test #\$i\" 'true'
-	done
-	test_done
-	EOF
-	check_sub_test_lib_test run-left-open-range <<-\\EOF
+test_expect_success 'subtest: --run with a left open range' '
+	run_sub_test_lib_test git-skip-tests-several \
+		--run="-3" &&
+	check_sub_test_lib_test git-skip-tests-several <<-\EOF
 	> ok 1 - passing test #1
 	> ok 2 - passing test #2
 	> ok 3 - passing test #3
@@ -510,18 +393,12 @@ test_expect_success '--run with a left open range' "
 	> # passed all 6 test(s)
 	> 1..6
 	EOF
-"
+'
 
-test_expect_success '--run with a right open range' "
-	run_sub_test_lib_test run-right-open-range \
-		'--run with a right open range' --run='4-' <<-\\EOF &&
-	for i in 1 2 3 4 5 6
-	do
-		test_expect_success \"passing test #\$i\" 'true'
-	done
-	test_done
-	EOF
-	check_sub_test_lib_test run-right-open-range <<-\\EOF
+test_expect_success 'subtest: --run with a right open range' '
+	run_sub_test_lib_test git-skip-tests-several \
+		--run="4-" &&
+	check_sub_test_lib_test git-skip-tests-several <<-\EOF
 	> ok 1 # skip passing test #1 (--run)
 	> ok 2 # skip passing test #2 (--run)
 	> ok 3 # skip passing test #3 (--run)
@@ -531,18 +408,12 @@ test_expect_success '--run with a right open range' "
 	> # passed all 6 test(s)
 	> 1..6
 	EOF
-"
+'
 
-test_expect_success '--run with basic negation' "
-	run_sub_test_lib_test run-basic-neg \
-		'--run with basic negation' --run='"'!3'"' <<-\\EOF &&
-	for i in 1 2 3 4 5 6
-	do
-		test_expect_success \"passing test #\$i\" 'true'
-	done
-	test_done
-	EOF
-	check_sub_test_lib_test run-basic-neg <<-\\EOF
+test_expect_success 'subtest: --run with basic negation' '
+	run_sub_test_lib_test git-skip-tests-several \
+		--run="!3" &&
+	check_sub_test_lib_test git-skip-tests-several <<-\EOF
 	> ok 1 - passing test #1
 	> ok 2 - passing test #2
 	> ok 3 # skip passing test #3 (--run)
@@ -552,18 +423,12 @@ test_expect_success '--run with basic negation' "
 	> # passed all 6 test(s)
 	> 1..6
 	EOF
-"
+'
 
-test_expect_success '--run with two negations' "
-	run_sub_test_lib_test run-two-neg \
-		'--run with two negations' --run='"'!3 !6'"' <<-\\EOF &&
-	for i in 1 2 3 4 5 6
-	do
-		test_expect_success \"passing test #\$i\" 'true'
-	done
-	test_done
-	EOF
-	check_sub_test_lib_test run-two-neg <<-\\EOF
+test_expect_success 'subtest: --run with two negations' '
+	run_sub_test_lib_test git-skip-tests-several \
+		--run="!3,!6" &&
+	check_sub_test_lib_test git-skip-tests-several <<-\EOF
 	> ok 1 - passing test #1
 	> ok 2 - passing test #2
 	> ok 3 # skip passing test #3 (--run)
@@ -573,18 +438,12 @@ test_expect_success '--run with two negations' "
 	> # passed all 6 test(s)
 	> 1..6
 	EOF
-"
+'
 
-test_expect_success '--run a range and negation' "
-	run_sub_test_lib_test run-range-and-neg \
-		'--run a range and negation' --run='"'-4 !2'"' <<-\\EOF &&
-	for i in 1 2 3 4 5 6
-	do
-		test_expect_success \"passing test #\$i\" 'true'
-	done
-	test_done
-	EOF
-	check_sub_test_lib_test run-range-and-neg <<-\\EOF
+test_expect_success 'subtest: --run a range and negation' '
+	run_sub_test_lib_test git-skip-tests-several \
+		--run="-4,!2" &&
+	check_sub_test_lib_test git-skip-tests-several <<-\EOF
 	> ok 1 - passing test #1
 	> ok 2 # skip passing test #2 (--run)
 	> ok 3 - passing test #3
@@ -594,18 +453,12 @@ test_expect_success '--run a range and negation' "
 	> # passed all 6 test(s)
 	> 1..6
 	EOF
-"
+'
 
-test_expect_success '--run range negation' "
-	run_sub_test_lib_test run-range-neg \
-		'--run range negation' --run='"'!1-3'"' <<-\\EOF &&
-	for i in 1 2 3 4 5 6
-	do
-		test_expect_success \"passing test #\$i\" 'true'
-	done
-	test_done
-	EOF
-	check_sub_test_lib_test run-range-neg <<-\\EOF
+test_expect_success 'subtest: --run range negation' '
+	run_sub_test_lib_test git-skip-tests-several \
+		--run="!1-3" &&
+	check_sub_test_lib_test git-skip-tests-several <<-\EOF
 	> ok 1 # skip passing test #1 (--run)
 	> ok 2 # skip passing test #2 (--run)
 	> ok 3 # skip passing test #3 (--run)
@@ -615,19 +468,12 @@ test_expect_success '--run range negation' "
 	> # passed all 6 test(s)
 	> 1..6
 	EOF
-"
+'
 
-test_expect_success '--run include, exclude and include' "
-	run_sub_test_lib_test run-inc-neg-inc \
-		'--run include, exclude and include' \
-		--run='"'1-5 !1-3 2'"' <<-\\EOF &&
-	for i in 1 2 3 4 5 6
-	do
-		test_expect_success \"passing test #\$i\" 'true'
-	done
-	test_done
-	EOF
-	check_sub_test_lib_test run-inc-neg-inc <<-\\EOF
+test_expect_success 'subtest: --run include, exclude and include' '
+	run_sub_test_lib_test git-skip-tests-several \
+		--run="1-5,!1-3,2" &&
+	check_sub_test_lib_test git-skip-tests-several <<-\EOF
 	> ok 1 # skip passing test #1 (--run)
 	> ok 2 - passing test #2
 	> ok 3 # skip passing test #3 (--run)
@@ -637,19 +483,12 @@ test_expect_success '--run include, exclude and include' "
 	> # passed all 6 test(s)
 	> 1..6
 	EOF
-"
+'
 
-test_expect_success '--run include, exclude and include, comma separated' "
-	run_sub_test_lib_test run-inc-neg-inc-comma \
-		'--run include, exclude and include, comma separated' \
-		--run=1-5,\!1-3,2 <<-\\EOF &&
-	for i in 1 2 3 4 5 6
-	do
-		test_expect_success \"passing test #\$i\" 'true'
-	done
-	test_done
-	EOF
-	check_sub_test_lib_test run-inc-neg-inc-comma <<-\\EOF
+test_expect_success 'subtest: --run include, exclude and include, comma separated' '
+	run_sub_test_lib_test git-skip-tests-several \
+		--run=1-5,!1-3,2 &&
+	check_sub_test_lib_test git-skip-tests-several <<-\EOF
 	> ok 1 # skip passing test #1 (--run)
 	> ok 2 - passing test #2
 	> ok 3 # skip passing test #3 (--run)
@@ -659,19 +498,12 @@ test_expect_success '--run include, exclude and include, comma separated' "
 	> # passed all 6 test(s)
 	> 1..6
 	EOF
-"
+'
 
-test_expect_success '--run exclude and include' "
-	run_sub_test_lib_test run-neg-inc \
-		'--run exclude and include' \
-		--run='"'!3- 5'"' <<-\\EOF &&
-	for i in 1 2 3 4 5 6
-	do
-		test_expect_success \"passing test #\$i\" 'true'
-	done
-	test_done
-	EOF
-	check_sub_test_lib_test run-neg-inc <<-\\EOF
+test_expect_success 'subtest: --run exclude and include' '
+	run_sub_test_lib_test git-skip-tests-several \
+		--run="!3-,5" &&
+	check_sub_test_lib_test git-skip-tests-several <<-\EOF
 	> ok 1 - passing test #1
 	> ok 2 - passing test #2
 	> ok 3 # skip passing test #3 (--run)
@@ -681,19 +513,12 @@ test_expect_success '--run exclude and include' "
 	> # passed all 6 test(s)
 	> 1..6
 	EOF
-"
+'
 
-test_expect_success '--run empty selectors' "
-	run_sub_test_lib_test run-empty-sel \
-		'--run empty selectors' \
-		--run='1,,3,,,5' <<-\\EOF &&
-	for i in 1 2 3 4 5 6
-	do
-		test_expect_success \"passing test #\$i\" 'true'
-	done
-	test_done
-	EOF
-	check_sub_test_lib_test run-empty-sel <<-\\EOF
+test_expect_success 'subtest: --run empty selectors' '
+	run_sub_test_lib_test git-skip-tests-several \
+		--run="1,,3,,,5" &&
+	check_sub_test_lib_test git-skip-tests-several <<-\EOF
 	> ok 1 - passing test #1
 	> ok 2 # skip passing test #2 (--run)
 	> ok 3 - passing test #3
@@ -703,161 +528,255 @@ test_expect_success '--run empty selectors' "
 	> # passed all 6 test(s)
 	> 1..6
 	EOF
-"
+'
 
-test_expect_success '--run invalid range start' "
-	run_sub_test_lib_test_err run-inv-range-start \
-		'--run invalid range start' \
-		--run='a-5' <<-\\EOF &&
-	test_expect_success \"passing test #1\" 'true'
+test_expect_success 'subtest: --run substring selector' '
+	write_and_run_sub_test_lib_test run-substring-selector \
+		--run="relevant" <<-\EOF &&
+	test_expect_success "relevant test" "true"
+	for i in 1 2 3 4 5 6
+	do
+		test_expect_success "other test #$i" "true"
+	done
+	test_done
+	EOF
+	check_sub_test_lib_test run-substring-selector <<-\EOF
+	> ok 1 - relevant test
+	> ok 2 # skip other test #1 (--run)
+	> ok 3 # skip other test #2 (--run)
+	> ok 4 # skip other test #3 (--run)
+	> ok 5 # skip other test #4 (--run)
+	> ok 6 # skip other test #5 (--run)
+	> ok 7 # skip other test #6 (--run)
+	> # passed all 7 test(s)
+	> 1..7
+	EOF
+'
+
+test_expect_success 'subtest: --run keyword selection' '
+	write_and_run_sub_test_lib_test_err run-inv-range-start \
+		--run="a-5" <<-\EOF &&
+	test_expect_success "passing test #1" "true"
 	test_done
 	EOF
 	check_sub_test_lib_test_err run-inv-range-start \
-		<<-\\EOF_OUT 3<<-\\EOF_ERR
+		<<-\EOF_OUT 3<<-EOF_ERR
 	> FATAL: Unexpected exit with code 1
 	EOF_OUT
-	> error: --run: invalid non-numeric in range start: 'a-5'
+	> error: --run: invalid non-numeric in range start: ${SQ}a-5${SQ}
 	EOF_ERR
-"
+'
 
-test_expect_success '--run invalid range end' "
-	run_sub_test_lib_test_err run-inv-range-end \
-		'--run invalid range end' \
-		--run='1-z' <<-\\EOF &&
-	test_expect_success \"passing test #1\" 'true'
-	test_done
-	EOF
-	check_sub_test_lib_test_err run-inv-range-end \
-		<<-\\EOF_OUT 3<<-\\EOF_ERR
+test_expect_success 'subtest: --run invalid range end' '
+	run_sub_test_lib_test_err run-inv-range-start \
+		--run="1-z" &&
+	check_sub_test_lib_test_err run-inv-range-start \
+		<<-\EOF_OUT 3<<-EOF_ERR
 	> FATAL: Unexpected exit with code 1
 	EOF_OUT
-	> error: --run: invalid non-numeric in range end: '1-z'
+	> error: --run: invalid non-numeric in range end: ${SQ}1-z${SQ}
 	EOF_ERR
-"
+'
 
-test_expect_success '--run invalid selector' "
-	run_sub_test_lib_test_err run-inv-selector \
-		'--run invalid selector' \
-		--run='1?' <<-\\EOF &&
-	test_expect_success \"passing test #1\" 'true'
-	test_done
+test_expect_success 'subtest: --invert-exit-code without --immediate' '
+	run_sub_test_lib_test_err full-pass \
+		--invert-exit-code &&
+	check_sub_test_lib_test_err full-pass \
+		<<-\EOF_OUT 3<<-EOF_ERR
+	ok 1 - passing test #1
+	ok 2 - passing test #2
+	ok 3 - passing test #3
+	# passed all 3 test(s)
+	1..3
+	# faking up non-zero exit with --invert-exit-code
+	EOF_OUT
+	EOF_ERR
+'
+
+test_expect_success 'subtest: --invert-exit-code with --immediate: all passed' '
+	run_sub_test_lib_test_err full-pass \
+		--invert-exit-code --immediate &&
+	check_sub_test_lib_test_err full-pass \
+		<<-\EOF_OUT 3<<-EOF_ERR
+	ok 1 - passing test #1
+	ok 2 - passing test #2
+	ok 3 - passing test #3
+	# passed all 3 test(s)
+	1..3
+	# faking up non-zero exit with --invert-exit-code
+	EOF_OUT
+	EOF_ERR
+'
+
+test_expect_success 'subtest: --invert-exit-code without --immediate: partial pass' '
+	run_sub_test_lib_test partial-pass \
+		--invert-exit-code &&
+	check_sub_test_lib_test partial-pass <<-\EOF
+	ok 1 - passing test #1
+	not ok 2 - # TODO induced breakage (--invert-exit-code): failing test #2
+	#	false
+	ok 3 - passing test #3
+	# failed 1 among 3 test(s)
+	1..3
+	# faked up failures as TODO & now exiting with 0 due to --invert-exit-code
 	EOF
-	check_sub_test_lib_test_err run-inv-selector \
-		<<-\\EOF_OUT 3<<-\\EOF_ERR
-	> FATAL: Unexpected exit with code 1
+'
+
+test_expect_success 'subtest: --invert-exit-code with --immediate: partial pass' '
+	run_sub_test_lib_test partial-pass \
+		--invert-exit-code --immediate &&
+	check_sub_test_lib_test partial-pass \
+		<<-\EOF_OUT 3<<-EOF_ERR
+	ok 1 - passing test #1
+	not ok 2 - # TODO induced breakage (--invert-exit-code): failing test #2
+	#	false
+	1..2
+	# faked up failures as TODO & now exiting with 0 due to --invert-exit-code
+	EOF_OUT
+	EOF_ERR
+'
+
+test_expect_success 'subtest: --invert-exit-code --immediate: got a failure' '
+	run_sub_test_lib_test partial-pass \
+		--invert-exit-code --immediate &&
+	check_sub_test_lib_test_err partial-pass \
+		<<-\EOF_OUT 3<<-EOF_ERR
+	ok 1 - passing test #1
+	not ok 2 - # TODO induced breakage (--invert-exit-code): failing test #2
+	#	false
+	1..2
+	# faked up failures as TODO & now exiting with 0 due to --invert-exit-code
 	EOF_OUT
-	> error: --run: invalid non-numeric in test selector: '1?'
 	EOF_ERR
-"
-
-
-test_set_prereq HAVEIT
-haveit=no
-test_expect_success HAVEIT 'test runs if prerequisite is satisfied' '
-	test_have_prereq HAVEIT &&
-	haveit=yes
-'
-donthaveit=yes
-test_expect_success DONTHAVEIT 'unmet prerequisite causes test to be skipped' '
-	donthaveit=no
-'
-if test -z "$GIT_TEST_FAIL_PREREQS_INTERNAL" -a $haveit$donthaveit != yesyes
-then
-	say "bug in test framework: prerequisite tags do not work reliably"
-	exit 1
-fi
-
-test_set_prereq HAVETHIS
-haveit=no
-test_expect_success HAVETHIS,HAVEIT 'test runs if prerequisites are satisfied' '
-	test_have_prereq HAVEIT &&
-	test_have_prereq HAVETHIS &&
-	haveit=yes
-'
-donthaveit=yes
-test_expect_success HAVEIT,DONTHAVEIT 'unmet prerequisites causes test to be skipped' '
-	donthaveit=no
-'
-donthaveiteither=yes
-test_expect_success DONTHAVEIT,HAVEIT 'unmet prerequisites causes test to be skipped' '
-	donthaveiteither=no
-'
-if test -z "$GIT_TEST_FAIL_PREREQS_INTERNAL" -a $haveit$donthaveit$donthaveiteither != yesyesyes
-then
-	say "bug in test framework: multiple prerequisite tags do not work reliably"
-	exit 1
-fi
-
-test_lazy_prereq LAZY_TRUE true
-havetrue=no
-test_expect_success LAZY_TRUE 'test runs if lazy prereq is satisfied' '
-	havetrue=yes
-'
-donthavetrue=yes
-test_expect_success !LAZY_TRUE 'missing lazy prereqs skip tests' '
-	donthavetrue=no
-'
-
-if test -z "$GIT_TEST_FAIL_PREREQS_INTERNAL" -a "$havetrue$donthavetrue" != yesyes
-then
-	say 'bug in test framework: lazy prerequisites do not work'
-	exit 1
-fi
-
-test_lazy_prereq LAZY_FALSE false
-nothavefalse=no
-test_expect_success !LAZY_FALSE 'negative lazy prereqs checked' '
-	nothavefalse=yes
-'
-havefalse=yes
-test_expect_success LAZY_FALSE 'missing negative lazy prereqs will skip' '
-	havefalse=no
-'
-
-if test -z "$GIT_TEST_FAIL_PREREQS_INTERNAL" -a "$nothavefalse$havefalse" != yesyes
-then
-	say 'bug in test framework: negative lazy prerequisites do not work'
-	exit 1
-fi
-
-clean=no
-test_expect_success 'tests clean up after themselves' '
-	test_when_finished clean=yes
-'
-
-if test -z "$GIT_TEST_FAIL_PREREQS_INTERNAL" -a $clean != yes
-then
-	say "bug in test framework: basic cleanup command does not work reliably"
-	exit 1
-fi
-
-test_expect_success 'lazy prereqs do not turn off tracing' "
-	run_sub_test_lib_test lazy-prereq-and-tracing \
-		'lazy prereqs and -x' -v -x <<-\\EOF &&
+'
+
+test_expect_success 'subtest: tests respect prerequisites' '
+	write_and_run_sub_test_lib_test prereqs <<-\EOF &&
+
+	test_set_prereq HAVEIT
+	test_expect_success HAVEIT "prereq is satisfied" "true"
+	test_expect_success "have_prereq works" "
+		test_have_prereq HAVEIT
+	"
+	test_expect_success DONTHAVEIT "prereq not satisfied" "false"
+
+	test_set_prereq HAVETHIS
+	test_expect_success HAVETHIS,HAVEIT "multiple prereqs" "true"
+	test_expect_success HAVEIT,DONTHAVEIT "mixed prereqs (yes,no)" "false"
+	test_expect_success DONTHAVEIT,HAVEIT "mixed prereqs (no,yes)" "false"
+
+	test_done
+	EOF
+
+	check_sub_test_lib_test prereqs <<-\EOF
+	ok 1 - prereq is satisfied
+	ok 2 - have_prereq works
+	ok 3 # skip prereq not satisfied (missing DONTHAVEIT)
+	ok 4 - multiple prereqs
+	ok 5 # skip mixed prereqs (yes,no) (missing DONTHAVEIT of HAVEIT,DONTHAVEIT)
+	ok 6 # skip mixed prereqs (no,yes) (missing DONTHAVEIT of DONTHAVEIT,HAVEIT)
+	# passed all 6 test(s)
+	1..6
+	EOF
+'
+
+test_expect_success 'subtest: tests respect lazy prerequisites' '
+	write_and_run_sub_test_lib_test lazy-prereqs <<-\EOF &&
+
+	test_lazy_prereq LAZY_TRUE true
+	test_expect_success LAZY_TRUE "lazy prereq is satisifed" "true"
+	test_expect_success !LAZY_TRUE "negative lazy prereq" "false"
+
+	test_lazy_prereq LAZY_FALSE false
+	test_expect_success LAZY_FALSE "lazy prereq not satisfied" "false"
+	test_expect_success !LAZY_FALSE "negative false prereq" "true"
+
+	test_done
+	EOF
+
+	check_sub_test_lib_test lazy-prereqs <<-\EOF
+	ok 1 - lazy prereq is satisifed
+	ok 2 # skip negative lazy prereq (missing !LAZY_TRUE)
+	ok 3 # skip lazy prereq not satisfied (missing LAZY_FALSE)
+	ok 4 - negative false prereq
+	# passed all 4 test(s)
+	1..4
+	EOF
+'
+
+test_expect_success 'subtest: nested lazy prerequisites' '
+	write_and_run_sub_test_lib_test nested-lazy <<-\EOF &&
+
+	test_lazy_prereq NESTED_INNER "
+		>inner &&
+		rm -f outer
+	"
+	test_lazy_prereq NESTED_PREREQ "
+		>outer &&
+		test_have_prereq NESTED_INNER &&
+		echo can create new file in cwd >file &&
+		test_path_is_file outer &&
+		test_path_is_missing inner
+	"
+	test_expect_success NESTED_PREREQ "evaluate nested prereq" "true"
+
+	test_done
+	EOF
+
+	check_sub_test_lib_test nested-lazy <<-\EOF
+	ok 1 - evaluate nested prereq
+	# passed all 1 test(s)
+	1..1
+	EOF
+'
+
+test_expect_success 'subtest: lazy prereqs do not turn off tracing' '
+	write_and_run_sub_test_lib_test lazy-prereq-and-tracing \
+		-v -x <<-\EOF &&
 	test_lazy_prereq LAZY true
 
-	test_expect_success lazy 'test_have_prereq LAZY && echo trace'
+	test_expect_success lazy "test_have_prereq LAZY && echo trace"
 
 	test_done
 	EOF
 
-	grep 'echo trace' lazy-prereq-and-tracing/err
-"
+	grep "echo trace" lazy-prereq-and-tracing/err
+'
 
-test_expect_success 'tests clean up even on failures' "
-	run_sub_test_lib_test_err \
-		failing-cleanup 'Failing tests with cleanup commands' <<-\\EOF &&
-	test_expect_success 'tests clean up even after a failure' '
+test_expect_success 'subtest: tests clean up after themselves' '
+	write_and_run_sub_test_lib_test cleanup <<-\EOF &&
+	clean=no
+	test_expect_success "do cleanup" "
+		test_when_finished clean=yes
+	"
+	test_expect_success "cleanup happened" "
+		test $clean = yes
+	"
+	test_done
+	EOF
+
+	check_sub_test_lib_test cleanup <<-\EOF
+	ok 1 - do cleanup
+	ok 2 - cleanup happened
+	# passed all 2 test(s)
+	1..2
+	EOF
+'
+
+test_expect_success 'subtest: tests clean up even on failures' '
+	write_and_run_sub_test_lib_test_err \
+		failing-cleanup <<-\EOF &&
+	test_expect_success "tests clean up even after a failure" "
 		touch clean-after-failure &&
 		test_when_finished rm clean-after-failure &&
 		(exit 1)
-	'
-	test_expect_success 'failure to clean up causes the test to fail' '
+	"
+	test_expect_success "failure to clean up causes the test to fail" "
 		test_when_finished \"(exit 2)\"
-	'
+	"
 	test_done
 	EOF
-	check_sub_test_lib_test failing-cleanup <<-\\EOF
+	check_sub_test_lib_test failing-cleanup <<-\EOF
 	> not ok 1 - tests clean up even after a failure
 	> #	Z
 	> #	touch clean-after-failure &&
@@ -866,37 +785,38 @@ test_expect_success 'tests clean up even on failures' "
 	> #	Z
 	> not ok 2 - failure to clean up causes the test to fail
 	> #	Z
-	> #	test_when_finished \"(exit 2)\"
+	> #	test_when_finished "(exit 2)"
 	> #	Z
 	> # failed 2 among 2 test(s)
 	> 1..2
 	EOF
-"
+'
 
-test_expect_success 'test_atexit is run' "
-	run_sub_test_lib_test_err \
-		atexit-cleanup 'Run atexit commands' -i <<-\\EOF &&
-	test_expect_success 'tests clean up even after a failure' '
+test_expect_success 'subtest: test_atexit is run' '
+	write_and_run_sub_test_lib_test_err \
+		atexit-cleanup -i <<-\EOF &&
+	test_expect_success "tests clean up even after a failure" "
 		> ../../clean-atexit &&
 		test_atexit rm ../../clean-atexit &&
 		> ../../also-clean-atexit &&
 		test_atexit rm ../../also-clean-atexit &&
 		> ../../dont-clean-atexit &&
 		(exit 1)
-	'
+	"
 	test_done
 	EOF
 	test_path_is_file dont-clean-atexit &&
 	test_path_is_missing clean-atexit &&
 	test_path_is_missing also-clean-atexit
-"
+'
 
 test_expect_success 'test_oid provides sane info by default' '
 	test_oid zero >actual &&
 	grep "^00*\$" actual &&
 	rawsz="$(test_oid rawsz)" &&
 	hexsz="$(test_oid hexsz)" &&
-	test "$hexsz" -eq $(wc -c <actual) &&
+	# +1 accounts for the trailing newline
+	test $(( $hexsz + 1)) -eq $(wc -c <actual) &&
 	test $(( $rawsz * 2)) -eq "$hexsz"
 '
 
@@ -907,7 +827,7 @@ test_expect_success 'test_oid can look up data for SHA-1' '
 	grep "^00*\$" actual &&
 	rawsz="$(test_oid rawsz)" &&
 	hexsz="$(test_oid hexsz)" &&
-	test $(wc -c <actual) -eq 40 &&
+	test $(wc -c <actual) -eq 41 &&
 	test "$rawsz" -eq 20 &&
 	test "$hexsz" -eq 40
 '
@@ -919,7 +839,7 @@ test_expect_success 'test_oid can look up data for SHA-256' '
 	grep "^00*\$" actual &&
 	rawsz="$(test_oid rawsz)" &&
 	hexsz="$(test_oid hexsz)" &&
-	test $(wc -c <actual) -eq 64 &&
+	test $(wc -c <actual) -eq 65 &&
 	test "$rawsz" -eq 32 &&
 	test "$hexsz" -eq 64
 '
@@ -1094,7 +1014,7 @@ test_expect_success 'validate object ID for a known tree' '
 '
 
 test_expect_success 'showing tree with git ls-tree' '
-    git ls-tree $tree >current
+	git ls-tree $tree >current
 '
 
 test_expect_success 'git ls-tree output for a known tree' '
@@ -1191,7 +1111,7 @@ test_expect_success 'writing this tree with --missing-ok' '
 test_expect_success 'git read-tree followed by write-tree should be idempotent' '
 	rm -f .git/index &&
 	git read-tree $tree &&
-	test -f .git/index &&
+	test_path_is_file .git/index &&
 	newtree=$(git write-tree) &&
 	test "$newtree" = "$tree"
 '
@@ -1225,28 +1145,29 @@ P=$(test_oid root)
 
 test_expect_success 'git commit-tree records the correct tree in a commit' '
 	commit0=$(echo NO | git commit-tree $P) &&
-	tree=$(git show --pretty=raw $commit0 |
-		 sed -n -e "s/^tree //p" -e "/^author /q") &&
+	git show --pretty=raw $commit0 >out &&
+	tree=$(sed -n -e "s/^tree //p" -e "/^author /q" out) &&
 	test "z$tree" = "z$P"
 '
 
 test_expect_success 'git commit-tree records the correct parent in a commit' '
 	commit1=$(echo NO | git commit-tree $P -p $commit0) &&
-	parent=$(git show --pretty=raw $commit1 |
-		sed -n -e "s/^parent //p" -e "/^author /q") &&
+	git show --pretty=raw $commit1 >out &&
+	parent=$(sed -n -e "s/^parent //p" -e "/^author /q" out) &&
 	test "z$commit0" = "z$parent"
 '
 
 test_expect_success 'git commit-tree omits duplicated parent in a commit' '
 	commit2=$(echo NO | git commit-tree $P -p $commit0 -p $commit0) &&
-	     parent=$(git show --pretty=raw $commit2 |
-		sed -n -e "s/^parent //p" -e "/^author /q" |
-		sort -u) &&
+	git show --pretty=raw $commit2 >out &&
+	cat >match.sed <<-\EOF &&
+	s/^parent //p
+	/^author /q
+	EOF
+	parent=$(sed -n -f match.sed out | sort -u) &&
 	test "z$commit0" = "z$parent" &&
-	numparent=$(git show --pretty=raw $commit2 |
-		sed -n -e "s/^parent //p" -e "/^author /q" |
-		wc -l) &&
-	test $numparent = 1
+	git show --pretty=raw $commit2 >out &&
+	test_stdout_line_count = 1 sed -n -f match.sed out
 '
 
 test_expect_success 'update-index D/F conflict' '
@@ -1254,7 +1175,8 @@ test_expect_success 'update-index D/F conflict' '
 	mv path2 path0 &&
 	mv tmp path2 &&
 	git update-index --add --replace path2 path0/file2 &&
-	numpath0=$(git ls-files path0 | wc -l) &&
+	git ls-files path0 >tmp &&
+	numpath0=$(wc -l <tmp) &&
 	test $numpath0 = 1
 '
 
@@ -1268,13 +1190,14 @@ test_expect_success 'very long name in the index handled sanely' '
 
 	>path4 &&
 	git update-index --add path4 &&
+	git ls-files -s path4 >tmp &&
 	(
-		git ls-files -s path4 |
-		sed -e "s/	.*/	/" |
+		sed -e "s/	.*/	/" tmp |
 		tr -d "\012" &&
 		echo "$a"
 	) | git update-index --index-info &&
-	len=$(git ls-files "a*" | wc -c) &&
+	git ls-files "a*" >tmp &&
+	len=$(wc -c <tmp) &&
 	test $len = 4098
 '
 
diff --git a/t/t0001-init.sh b/t/t0001-init.sh
index d71d4c7..b131d66 100755
--- a/t/t0001-init.sh
+++ b/t/t0001-init.sh
@@ -2,10 +2,12 @@
 
 test_description='git init'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 check_config () {
-	if test -d "$1" && test -f "$1/config" && test -d "$1/refs"
+	if test_path_is_dir "$1" &&
+	   test_path_is_file "$1/config" && test_path_is_dir "$1/refs"
 	then
 		: happy
 	else
@@ -163,11 +165,11 @@ test_expect_success 'reinit' '
 	(
 		mkdir again &&
 		cd again &&
-		git init >out1 2>err1 &&
+		git -c init.defaultBranch=initial init >out1 2>err1 &&
 		git init >out2 2>err2
 	) &&
-	test_i18ngrep "Initialized empty" again/out1 &&
-	test_i18ngrep "Reinitialized existing" again/out2 &&
+	test_grep "Initialized empty" again/out1 &&
+	test_grep "Reinitialized existing" again/out2 &&
 	test_must_be_empty again/err1 &&
 	test_must_be_empty again/err2
 '
@@ -186,21 +188,33 @@ test_expect_success 'init with --template (blank)' '
 	test_path_is_missing template-blank/.git/info/exclude
 '
 
-test_expect_success 'init with init.templatedir set' '
-	mkdir templatedir-source &&
-	echo Content >templatedir-source/file &&
-	test_config_global init.templatedir "${HOME}/templatedir-source" &&
+init_no_templatedir_env () {
 	(
-		mkdir templatedir-set &&
-		cd templatedir-set &&
 		sane_unset GIT_TEMPLATE_DIR &&
 		NO_SET_GIT_TEMPLATE_DIR=t &&
 		export NO_SET_GIT_TEMPLATE_DIR &&
-		git init
-	) &&
+		git init "$1"
+	)
+}
+
+test_expect_success 'init with init.templatedir set' '
+	mkdir templatedir-source &&
+	echo Content >templatedir-source/file &&
+	test_config_global init.templatedir "${HOME}/templatedir-source" &&
+
+	init_no_templatedir_env templatedir-set &&
 	test_cmp templatedir-source/file templatedir-set/.git/file
 '
 
+test_expect_success 'init with init.templatedir using ~ expansion' '
+	mkdir -p templatedir-source &&
+	echo Content >templatedir-source/file &&
+	test_config_global init.templatedir "~/templatedir-source" &&
+
+	init_no_templatedir_env templatedir-expansion &&
+	test_cmp templatedir-source/file templatedir-expansion/.git/file
+'
+
 test_expect_success 'init --bare/--shared overrides system/global config' '
 	test_config_global core.bare false &&
 	test_config_global core.sharedRepository 0640 &&
@@ -316,13 +330,38 @@ test_expect_success 'init with separate gitdir' '
 	test_path_is_dir realgitdir/refs
 '
 
+test_expect_success 'explicit bare & --separate-git-dir incompatible' '
+	test_must_fail git init --bare --separate-git-dir goop.git bare.git 2>err &&
+	test_grep "cannot be used together" err
+'
+
+test_expect_success 'implicit bare & --separate-git-dir incompatible' '
+	test_when_finished "rm -rf bare.git" &&
+	mkdir -p bare.git &&
+	test_must_fail env GIT_DIR=. \
+		git -C bare.git init --separate-git-dir goop.git 2>err &&
+	test_grep "incompatible" err
+'
+
+test_expect_success 'bare & --separate-git-dir incompatible within worktree' '
+	test_when_finished "rm -rf bare.git linkwt seprepo" &&
+	test_commit gumby &&
+	git clone --bare . bare.git &&
+	git -C bare.git worktree add --detach ../linkwt &&
+	test_must_fail git -C linkwt init --separate-git-dir seprepo 2>err &&
+	test_grep "incompatible" err
+'
+
 test_lazy_prereq GETCWD_IGNORES_PERMS '
 	base=GETCWD_TEST_BASE_DIR &&
 	mkdir -p $base/dir &&
 	chmod 100 $base ||
 	BUG "cannot prepare $base"
 
-	(cd $base/dir && /bin/pwd -P)
+	(
+		cd $base/dir &&
+		test-tool getcwd
+	)
 	status=$?
 
 	chmod 700 $base &&
@@ -392,6 +431,25 @@ test_expect_success SYMLINKS 're-init to move gitdir symlink' '
 	test_path_is_dir realgitdir/refs
 '
 
+sep_git_dir_worktree ()  {
+	test_when_finished "rm -rf mainwt linkwt seprepo" &&
+	git init mainwt &&
+	test_commit -C mainwt gumby &&
+	git -C mainwt worktree add --detach ../linkwt &&
+	git -C "$1" init --separate-git-dir ../seprepo &&
+	git -C mainwt rev-parse --git-common-dir >expect &&
+	git -C linkwt rev-parse --git-common-dir >actual &&
+	test_cmp expect actual
+}
+
+test_expect_success 're-init to move gitdir with linked worktrees' '
+	sep_git_dir_worktree mainwt
+'
+
+test_expect_success 're-init to move gitdir within linked worktree' '
+	sep_git_dir_worktree linkwt
+'
+
 test_expect_success MINGW '.git hidden' '
 	rm -rf newdir &&
 	(
@@ -474,6 +532,76 @@ test_expect_success 'init rejects attempts to initialize with different hash' '
 	test_must_fail git -C sha256 init --object-format=sha1
 '
 
+test_expect_success DEFAULT_REPO_FORMAT 'extensions.refStorage is not allowed with repo version 0' '
+	test_when_finished "rm -rf refstorage" &&
+	git init refstorage &&
+	git -C refstorage config extensions.refStorage files &&
+	test_must_fail git -C refstorage rev-parse 2>err &&
+	grep "repo version is 0, but v1-only extension found" err
+'
+
+test_expect_success DEFAULT_REPO_FORMAT 'extensions.refStorage with files backend' '
+	test_when_finished "rm -rf refstorage" &&
+	git init refstorage &&
+	git -C refstorage config core.repositoryformatversion 1 &&
+	git -C refstorage config extensions.refStorage files &&
+	test_commit -C refstorage A &&
+	git -C refstorage rev-parse --verify HEAD
+'
+
+test_expect_success DEFAULT_REPO_FORMAT 'extensions.refStorage with unknown backend' '
+	test_when_finished "rm -rf refstorage" &&
+	git init refstorage &&
+	git -C refstorage config core.repositoryformatversion 1 &&
+	git -C refstorage config extensions.refStorage garbage &&
+	test_must_fail git -C refstorage rev-parse 2>err &&
+	grep "invalid value for ${SQ}extensions.refstorage${SQ}: ${SQ}garbage${SQ}" err
+'
+
+test_expect_success DEFAULT_REPO_FORMAT 'init with GIT_DEFAULT_REF_FORMAT=files' '
+	test_when_finished "rm -rf refformat" &&
+	GIT_DEFAULT_REF_FORMAT=files git init refformat &&
+	echo 0 >expect &&
+	git -C refformat config core.repositoryformatversion >actual &&
+	test_cmp expect actual &&
+	test_must_fail git -C refformat config extensions.refstorage
+'
+
+test_expect_success 'init with GIT_DEFAULT_REF_FORMAT=garbage' '
+	test_when_finished "rm -rf refformat" &&
+	cat >expect <<-EOF &&
+	fatal: unknown ref storage format ${SQ}garbage${SQ}
+	EOF
+	test_must_fail env GIT_DEFAULT_REF_FORMAT=garbage git init refformat 2>err &&
+	test_cmp expect err
+'
+
+test_expect_success 'init with --ref-format=files' '
+	test_when_finished "rm -rf refformat" &&
+	git init --ref-format=files refformat &&
+	echo files >expect &&
+	git -C refformat rev-parse --show-ref-format >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 're-init with same format' '
+	test_when_finished "rm -rf refformat" &&
+	git init --ref-format=files refformat &&
+	git init --ref-format=files refformat &&
+	echo files >expect &&
+	git -C refformat rev-parse --show-ref-format >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'init with --ref-format=garbage' '
+	test_when_finished "rm -rf refformat" &&
+	cat >expect <<-EOF &&
+	fatal: unknown ref storage format ${SQ}garbage${SQ}
+	EOF
+	test_must_fail git init --ref-format=garbage refformat 2>err &&
+	test_cmp expect err
+'
+
 test_expect_success MINGW 'core.hidedotfiles = false' '
 	git config --global core.hidedotfiles false &&
 	rm -rf newdir &&
@@ -505,22 +633,49 @@ test_expect_success '--initial-branch' '
 
 	: re-initializing should not change the branch name &&
 	git init --initial-branch=ignore initial-branch-option 2>err &&
-	test_i18ngrep "ignored --initial-branch" err &&
+	test_grep "ignored --initial-branch" err &&
 	git -C initial-branch-option symbolic-ref HEAD >actual &&
 	grep hello actual
 '
 
 test_expect_success 'overridden default initial branch name (config)' '
 	test_config_global init.defaultBranch nmb &&
-	git init initial-branch-config &&
+	GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME= git init initial-branch-config &&
 	git -C initial-branch-config symbolic-ref HEAD >actual &&
 	grep nmb actual
 '
 
+test_expect_success 'advice on unconfigured init.defaultBranch' '
+	GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME= git -c color.advice=always \
+		init unconfigured-default-branch-name 2>err &&
+	test_decode_color <err >decoded &&
+	test_grep "<YELLOW>hint: " decoded
+'
+
+test_expect_success 'overridden default main branch name (env)' '
+	test_config_global init.defaultBranch nmb &&
+	GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=env git init main-branch-env &&
+	git -C main-branch-env symbolic-ref HEAD >actual &&
+	grep env actual
+'
+
 test_expect_success 'invalid default branch name' '
-	test_config_global init.defaultBranch "with space" &&
-	test_must_fail git init initial-branch-invalid 2>err &&
-	test_i18ngrep "invalid branch name" err
+	test_must_fail env GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME="with space" \
+		git init initial-branch-invalid 2>err &&
+	test_grep "invalid branch name" err
+'
+
+test_expect_success 'branch -m with the initial branch' '
+	git init rename-initial &&
+	git -C rename-initial branch -m renamed &&
+	echo renamed >expect &&
+	git -C rename-initial symbolic-ref --short HEAD >actual &&
+	test_cmp expect actual &&
+
+	git -C rename-initial branch -m renamed again &&
+	echo again >expect &&
+	git -C rename-initial symbolic-ref --short HEAD >actual &&
+	test_cmp expect actual
 '
 
 test_done
diff --git a/t/t0002-gitfile.sh b/t/t0002-gitfile.sh
index 960ed15..bf3bf60 100755
--- a/t/t0002-gitfile.sh
+++ b/t/t0002-gitfile.sh
@@ -4,6 +4,10 @@ test_description='.git file
 
 Verify that plumbing commands work when .git is a file
 '
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 objpath() {
@@ -18,23 +22,25 @@ test_expect_success 'initial setup' '
 test_expect_success 'bad setup: invalid .git file format' '
 	echo "gitdir $REAL" >.git &&
 	test_must_fail git rev-parse 2>.err &&
-	test_i18ngrep "invalid gitfile format" .err
+	test_grep "invalid gitfile format" .err
 '
 
 test_expect_success 'bad setup: invalid .git file path' '
 	echo "gitdir: $REAL.not" >.git &&
 	test_must_fail git rev-parse 2>.err &&
-	test_i18ngrep "not a git repository" .err
+	test_grep "not a git repository" .err
 '
 
 test_expect_success 'final setup + check rev-parse --git-dir' '
 	echo "gitdir: $REAL" >.git &&
-	test "$REAL" = "$(git rev-parse --git-dir)"
+	echo "$REAL" >expect &&
+	git rev-parse --git-dir >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success 'check hash-object' '
 	echo "foo" >bar &&
-	SHA=$(cat bar | git hash-object -w --stdin) &&
+	SHA=$(git hash-object -w --stdin <bar) &&
 	test_path_is_file "$REAL/objects/$(objpath $SHA)"
 '
 
@@ -63,7 +69,9 @@ test_expect_success 'check commit-tree' '
 
 test_expect_success 'check rev-list' '
 	git update-ref "HEAD" "$SHA" &&
-	test "$SHA" = "$(git rev-list HEAD)"
+	git rev-list HEAD >actual &&
+	echo $SHA >expected &&
+	test_cmp expected actual
 '
 
 test_expect_success 'setup_git_dir twice in subdir' '
@@ -96,7 +104,7 @@ test_expect_success 'enter_repo non-strict mode' '
 	git ls-remote enter_repo >actual &&
 	cat >expected <<-EOF &&
 	$head	HEAD
-	$head	refs/heads/master
+	$head	refs/heads/main
 	$head	refs/tags/foo
 	EOF
 	test_cmp expected actual
@@ -111,7 +119,7 @@ test_expect_success 'enter_repo linked checkout' '
 	git ls-remote foo >actual &&
 	cat >expected <<-EOF &&
 	$head	HEAD
-	$head	refs/heads/master
+	$head	refs/heads/main
 	$head	refs/tags/foo
 	EOF
 	test_cmp expected actual
@@ -122,7 +130,7 @@ test_expect_success 'enter_repo strict mode' '
 	git ls-remote --upload-pack="git upload-pack --strict" foo/.git >actual &&
 	cat >expected <<-EOF &&
 	$head	HEAD
-	$head	refs/heads/master
+	$head	refs/heads/main
 	$head	refs/tags/foo
 	EOF
 	test_cmp expected actual
diff --git a/t/t0003-attributes.sh b/t/t0003-attributes.sh
index b660593..774b52c 100755
--- a/t/t0003-attributes.sh
+++ b/t/t0003-attributes.sh
@@ -2,14 +2,34 @@
 
 test_description=gitattributes
 
+TEST_PASSES_SANITIZE_LEAK=true
+TEST_CREATE_REPO_NO_TEMPLATE=1
 . ./test-lib.sh
 
-attr_check () {
+attr_check_basic () {
 	path="$1" expect="$2" git_opts="$3" &&
 
 	git $git_opts check-attr test -- "$path" >actual 2>err &&
 	echo "$path: test: $expect" >expect &&
-	test_cmp expect actual &&
+	test_cmp expect actual
+}
+
+attr_check () {
+	attr_check_basic "$@" &&
+	test_must_be_empty err
+}
+
+attr_check_object_mode_basic () {
+	path="$1" &&
+	expect="$2" &&
+	check_opts="$3" &&
+	git check-attr $check_opts builtin_objectmode -- "$path" >actual 2>err &&
+	echo "$path: builtin_objectmode: $expect" >expect &&
+	test_cmp expect actual
+}
+
+attr_check_object_mode () {
+	attr_check_object_mode_basic "$@" &&
 	test_must_be_empty err
 }
 
@@ -19,7 +39,28 @@ attr_check_quote () {
 	git check-attr test -- "$path" >actual &&
 	echo "\"$quoted_path\": test: $expect" >expect &&
 	test_cmp expect actual
+}
 
+attr_check_source () {
+	path="$1" expect="$2" source="$3" git_opts="$4" &&
+
+	echo "$path: test: $expect" >expect &&
+
+	git $git_opts check-attr --source $source test -- "$path" >actual 2>err &&
+	test_cmp expect actual &&
+	test_must_be_empty err &&
+
+	git $git_opts --attr-source="$source" check-attr test -- "$path" >actual 2>err &&
+	test_cmp expect actual &&
+	test_must_be_empty err
+
+	git $git_opts -c "attr.tree=$source" check-attr test -- "$path" >actual 2>err &&
+	test_cmp expect actual &&
+	test_must_be_empty err
+
+	GIT_ATTR_SOURCE="$source" git $git_opts check-attr test -- "$path" >actual 2>err &&
+	test_cmp expect actual &&
+	test_must_be_empty err
 }
 
 test_expect_success 'open-quoted pathname' '
@@ -27,7 +68,6 @@ test_expect_success 'open-quoted pathname' '
 	attr_check a unspecified
 '
 
-
 test_expect_success 'setup' '
 	mkdir -p a/b/d a/c b &&
 	(
@@ -74,12 +114,23 @@ test_expect_success 'setup' '
 	EOF
 '
 
+test_expect_success 'setup branches' '
+	mkdir -p foo/bar &&
+	test_commit --printf "add .gitattributes" foo/bar/.gitattributes \
+		"f test=f\na/i test=n\n" tag-1 &&
+	test_commit --printf "add .gitattributes" foo/bar/.gitattributes \
+		"g test=g\na/i test=m\n" tag-2 &&
+	rm foo/bar/.gitattributes
+'
+
 test_expect_success 'command line checks' '
 	test_must_fail git check-attr &&
 	test_must_fail git check-attr -- &&
 	test_must_fail git check-attr test &&
 	test_must_fail git check-attr test -- &&
 	test_must_fail git check-attr -- f &&
+	test_must_fail git check-attr --source &&
+	test_must_fail git check-attr --source not-a-valid-ref &&
 	echo "f" | test_must_fail git check-attr --stdin &&
 	echo "f" | test_must_fail git check-attr --stdin -- f &&
 	echo "f" | test_must_fail git check-attr --stdin test -- f &&
@@ -197,18 +248,24 @@ test_expect_success 'attribute test: read paths from stdin' '
 	test_cmp expect actual
 '
 
-test_expect_success 'attribute test: --all option' '
+test_expect_success 'setup --all option' '
 	grep -v unspecified <expect-all | sort >specified-all &&
-	sed -e "s/:.*//" <expect-all | uniq >stdin-all &&
-	git check-attr --stdin --all <stdin-all | sort >actual &&
+	sed -e "s/:.*//" <expect-all | uniq >stdin-all
+'
+
+test_expect_success 'attribute test: --all option' '
+	git check-attr --stdin --all <stdin-all >tmp &&
+	sort tmp >actual &&
 	test_cmp specified-all actual
 '
 
 test_expect_success 'attribute test: --cached option' '
-	git check-attr --cached --stdin --all <stdin-all | sort >actual &&
+	git check-attr --cached --stdin --all <stdin-all >tmp &&
+	sort tmp >actual &&
 	test_must_be_empty actual &&
 	git add .gitattributes a/.gitattributes a/b/.gitattributes &&
-	git check-attr --cached --stdin --all <stdin-all | sort >actual &&
+	git check-attr --cached --stdin --all <stdin-all >tmp &&
+	sort tmp >actual &&
 	test_cmp specified-all actual
 '
 
@@ -220,7 +277,7 @@ test_expect_success 'root subdir attribute test' '
 test_expect_success 'negative patterns' '
 	echo "!f test=bar" >.gitattributes &&
 	git check-attr test -- '"'"'!f'"'"' 2>errors &&
-	test_i18ngrep "Negative patterns are ignored" errors
+	test_grep "Negative patterns are ignored" errors
 '
 
 test_expect_success 'patterns starting with exclamation' '
@@ -275,8 +332,17 @@ test_expect_success 'using --git-dir and --work-tree' '
 	)
 '
 
+test_expect_success 'using --source' '
+	attr_check_source foo/bar/f f tag-1 &&
+	attr_check_source foo/bar/a/i n tag-1 &&
+	attr_check_source foo/bar/f unspecified tag-2 &&
+	attr_check_source foo/bar/a/i m tag-2 &&
+	attr_check_source foo/bar/g g tag-2 &&
+	attr_check_source foo/bar/g unspecified tag-1
+'
+
 test_expect_success 'setup bare' '
-	git clone --bare . bare.git
+	git clone --template= --bare . bare.git
 '
 
 test_expect_success 'bare repository: check that .gitattribute is ignored' '
@@ -294,6 +360,86 @@ test_expect_success 'bare repository: check that .gitattribute is ignored' '
 	)
 '
 
+bad_attr_source_err="fatal: bad --attr-source or GIT_ATTR_SOURCE"
+
+test_expect_success '--attr-source is bad' '
+	test_when_finished rm -rf empty &&
+	git init empty &&
+	(
+		cd empty &&
+		echo "$bad_attr_source_err" >expect_err &&
+		test_must_fail git --attr-source=HEAD check-attr test -- f/path 2>err &&
+		test_cmp expect_err err
+	)
+'
+
+test_expect_success 'attr.tree when HEAD is unborn' '
+	test_when_finished rm -rf empty &&
+	git init empty &&
+	(
+		cd empty &&
+		echo "f/path: test: unspecified" >expect &&
+		git -c attr.tree=HEAD check-attr test -- f/path >actual 2>err &&
+		test_must_be_empty err &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'bad attr source defaults to reading .gitattributes file' '
+	test_when_finished rm -rf empty &&
+	git init empty &&
+	(
+		cd empty &&
+		echo "f/path test=val" >.gitattributes &&
+		echo "f/path: test: val" >expect &&
+		git -c attr.tree=HEAD check-attr test -- f/path >actual 2>err &&
+		test_must_be_empty err &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'bare repo defaults to reading .gitattributes from HEAD' '
+	test_when_finished rm -rf test bare_with_gitattribute &&
+	git init test &&
+	test_commit -C test gitattributes .gitattributes "f/path test=val" &&
+	git clone --bare test bare_with_gitattribute &&
+	echo "f/path: test: val" >expect &&
+	git -C bare_with_gitattribute check-attr test -- f/path >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'precedence of --attr-source, GIT_ATTR_SOURCE, then attr.tree' '
+	test_when_finished rm -rf empty &&
+	git init empty &&
+	(
+		cd empty &&
+		git checkout -b attr-source &&
+		test_commit "val1" .gitattributes "f/path test=val1" &&
+		git checkout -b attr-tree &&
+		test_commit "val2" .gitattributes "f/path test=val2" &&
+		git checkout attr-source &&
+		echo "f/path: test: val1" >expect &&
+		GIT_ATTR_SOURCE=attr-source git -c attr.tree=attr-tree --attr-source=attr-source \
+		check-attr test -- f/path >actual &&
+		test_cmp expect actual &&
+		GIT_ATTR_SOURCE=attr-source git -c attr.tree=attr-tree \
+		check-attr test -- f/path >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'bare repository: with --source' '
+	(
+		cd bare.git &&
+		attr_check_source foo/bar/f f tag-1 &&
+		attr_check_source foo/bar/a/i n tag-1 &&
+		attr_check_source foo/bar/f unspecified tag-2 &&
+		attr_check_source foo/bar/a/i m tag-2 &&
+		attr_check_source foo/bar/g g tag-2 &&
+		attr_check_source foo/bar/g unspecified tag-1
+	)
+'
+
 test_expect_success 'bare repository: check that --cached honors index' '
 	(
 		cd bare.git &&
@@ -307,6 +453,7 @@ test_expect_success 'bare repository: check that --cached honors index' '
 test_expect_success 'bare repository: test info/attributes' '
 	(
 		cd bare.git &&
+		mkdir info &&
 		(
 			echo "f	test=f" &&
 			echo "a/i test=a/i"
@@ -331,7 +478,6 @@ test_expect_success 'binary macro expanded by -a' '
 	test_cmp expect actual
 '
 
-
 test_expect_success 'query binary macro directly' '
 	echo "file binary" >.gitattributes &&
 	echo file: binary: set >expect &&
@@ -339,4 +485,153 @@ test_expect_success 'query binary macro directly' '
 	test_cmp expect actual
 '
 
+test_expect_success SYMLINKS 'set up symlink tests' '
+	echo "* test" >attr &&
+	rm -f .gitattributes
+'
+
+test_expect_success SYMLINKS 'symlinks respected in core.attributesFile' '
+	test_when_finished "rm symlink" &&
+	ln -s attr symlink &&
+	test_config core.attributesFile "$(pwd)/symlink" &&
+	attr_check file set
+'
+
+test_expect_success SYMLINKS 'symlinks respected in info/attributes' '
+	test_when_finished "rm .git/info/attributes" &&
+	mkdir .git/info &&
+	ln -s ../../attr .git/info/attributes &&
+	attr_check file set
+'
+
+test_expect_success SYMLINKS 'symlinks not respected in-tree' '
+	test_when_finished "rm -rf .gitattributes subdir" &&
+	ln -s attr .gitattributes &&
+	mkdir subdir &&
+	ln -s ../attr subdir/.gitattributes &&
+	attr_check_basic subdir/file unspecified &&
+	test_grep "unable to access.*gitattributes" err
+'
+
+test_expect_success 'large attributes line ignored in tree' '
+	test_when_finished "rm .gitattributes" &&
+	printf "path %02043d" 1 >.gitattributes &&
+	git check-attr --all path >actual 2>err &&
+	echo "warning: ignoring overly long attributes line 1" >expect &&
+	test_cmp expect err &&
+	test_must_be_empty actual
+'
+
+test_expect_success 'large attributes line ignores trailing content in tree' '
+	test_when_finished "rm .gitattributes" &&
+	# older versions of Git broke lines at 2048 bytes; the 2045 bytes
+	# of 0-padding here is accounting for the three bytes of "a 1", which
+	# would knock "trailing" to the "next" line, where it would be
+	# erroneously parsed.
+	printf "a %02045dtrailing attribute\n" 1 >.gitattributes &&
+	git check-attr --all trailing >actual 2>err &&
+	echo "warning: ignoring overly long attributes line 1" >expect &&
+	test_cmp expect err &&
+	test_must_be_empty actual
+'
+
+test_expect_success EXPENSIVE 'large attributes file ignored in tree' '
+	test_when_finished "rm .gitattributes" &&
+	dd if=/dev/zero of=.gitattributes bs=1048576 count=101 2>/dev/null &&
+	git check-attr --all path >/dev/null 2>err &&
+	echo "warning: ignoring overly large gitattributes file ${SQ}.gitattributes${SQ}" >expect &&
+	test_cmp expect err
+'
+
+test_expect_success 'large attributes line ignored in index' '
+	test_when_finished "git update-index --remove .gitattributes" &&
+	blob=$(printf "path %02043d" 1 | git hash-object -w --stdin) &&
+	git update-index --add --cacheinfo 100644,$blob,.gitattributes &&
+	git check-attr --cached --all path >actual 2>err &&
+	echo "warning: ignoring overly long attributes line 1" >expect &&
+	test_cmp expect err &&
+	test_must_be_empty actual
+'
+
+test_expect_success 'large attributes line ignores trailing content in index' '
+	test_when_finished "git update-index --remove .gitattributes" &&
+	blob=$(printf "a %02045dtrailing attribute\n" 1 | git hash-object -w --stdin) &&
+	git update-index --add --cacheinfo 100644,$blob,.gitattributes &&
+	git check-attr --cached --all trailing >actual 2>err &&
+	echo "warning: ignoring overly long attributes line 1" >expect &&
+	test_cmp expect err &&
+	test_must_be_empty actual
+'
+
+test_expect_success EXPENSIVE 'large attributes file ignored in index' '
+	test_when_finished "git update-index --remove .gitattributes" &&
+	blob=$(dd if=/dev/zero bs=1048576 count=101 2>/dev/null | git hash-object -w --stdin) &&
+	git update-index --add --cacheinfo 100644,$blob,.gitattributes &&
+	git check-attr --cached --all path >/dev/null 2>err &&
+	echo "warning: ignoring overly large gitattributes blob ${SQ}.gitattributes${SQ}" >expect &&
+	test_cmp expect err
+'
+
+test_expect_success 'builtin object mode attributes work (dir and regular paths)' '
+	>normal &&
+	attr_check_object_mode normal 100644 &&
+	mkdir dir &&
+	attr_check_object_mode dir 040000
+'
+
+test_expect_success POSIXPERM 'builtin object mode attributes work (executable)' '
+	>exec &&
+	chmod +x exec &&
+	attr_check_object_mode exec 100755
+'
+
+test_expect_success SYMLINKS 'builtin object mode attributes work (symlinks)' '
+	ln -s to_sym sym &&
+	attr_check_object_mode sym 120000
+'
+
+test_expect_success 'native object mode attributes work with --cached' '
+	>normal &&
+	git add normal &&
+	empty_blob=$(git rev-parse :normal) &&
+	git update-index --index-info <<-EOF &&
+	100755 $empty_blob 0	exec
+	120000 $empty_blob 0	symlink
+	EOF
+	attr_check_object_mode normal 100644 --cached &&
+	attr_check_object_mode exec 100755 --cached &&
+	attr_check_object_mode symlink 120000 --cached
+'
+
+test_expect_success 'check object mode attributes work for submodules' '
+	mkdir sub &&
+	(
+		cd sub &&
+		git init &&
+		mv .git .real &&
+		echo "gitdir: .real" >.git &&
+		test_commit first
+	) &&
+	attr_check_object_mode sub 160000 &&
+	attr_check_object_mode sub unspecified --cached &&
+	git add sub &&
+	attr_check_object_mode sub 160000 --cached
+'
+
+test_expect_success 'we do not allow user defined builtin_* attributes' '
+	echo "foo* builtin_foo" >.gitattributes &&
+	git add .gitattributes 2>actual &&
+	echo "builtin_foo is not a valid attribute name: .gitattributes:1" >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'user defined builtin_objectmode values are ignored' '
+	echo "foo* builtin_objectmode=12345" >.gitattributes &&
+	git add .gitattributes &&
+	>foo_1 &&
+	attr_check_object_mode_basic foo_1 100644 &&
+	echo "builtin_objectmode is not a valid attribute name: .gitattributes:1" >expect &&
+	test_cmp expect err
+'
+
 test_done
diff --git a/t/t0004-unwritable.sh b/t/t0004-unwritable.sh
index e3137d6..8114fac 100755
--- a/t/t0004-unwritable.sh
+++ b/t/t0004-unwritable.sh
@@ -2,6 +2,7 @@
 
 test_description='detect unwritable repository and fail correctly'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -18,27 +19,66 @@ test_expect_success setup '
 test_expect_success POSIXPERM,SANITY 'write-tree should notice unwritable repository' '
 	test_when_finished "chmod 775 .git/objects .git/objects/??" &&
 	chmod a-w .git/objects .git/objects/?? &&
-	test_must_fail git write-tree
+	test_must_fail git write-tree 2>out.write-tree
+'
+
+test_lazy_prereq WRITE_TREE_OUT 'test -e "$TRASH_DIRECTORY"/out.write-tree'
+test_expect_success WRITE_TREE_OUT 'write-tree output on unwritable repository' '
+	cat >expect <<-\EOF &&
+	error: insufficient permission for adding an object to repository database .git/objects
+	fatal: git-write-tree: error building trees
+	EOF
+	test_cmp expect out.write-tree
 '
 
 test_expect_success POSIXPERM,SANITY 'commit should notice unwritable repository' '
 	test_when_finished "chmod 775 .git/objects .git/objects/??" &&
 	chmod a-w .git/objects .git/objects/?? &&
-	test_must_fail git commit -m second
+	test_must_fail git commit -m second 2>out.commit
+'
+
+test_lazy_prereq COMMIT_OUT 'test -e "$TRASH_DIRECTORY"/out.commit'
+test_expect_success COMMIT_OUT 'commit output on unwritable repository' '
+	cat >expect <<-\EOF &&
+	error: insufficient permission for adding an object to repository database .git/objects
+	error: Error building trees
+	EOF
+	test_cmp expect out.commit
 '
 
 test_expect_success POSIXPERM,SANITY 'update-index should notice unwritable repository' '
 	test_when_finished "chmod 775 .git/objects .git/objects/??" &&
 	echo 6O >file &&
 	chmod a-w .git/objects .git/objects/?? &&
-	test_must_fail git update-index file
+	test_must_fail git update-index file 2>out.update-index
+'
+
+test_lazy_prereq UPDATE_INDEX_OUT 'test -e "$TRASH_DIRECTORY"/out.update-index'
+test_expect_success UPDATE_INDEX_OUT 'update-index output on unwritable repository' '
+	cat >expect <<-\EOF &&
+	error: insufficient permission for adding an object to repository database .git/objects
+	error: file: failed to insert into database
+	fatal: Unable to process path file
+	EOF
+	test_cmp expect out.update-index
 '
 
 test_expect_success POSIXPERM,SANITY 'add should notice unwritable repository' '
 	test_when_finished "chmod 775 .git/objects .git/objects/??" &&
 	echo b >file &&
 	chmod a-w .git/objects .git/objects/?? &&
-	test_must_fail git add file
+	test_must_fail git add file 2>out.add
+'
+
+test_lazy_prereq ADD_OUT 'test -e "$TRASH_DIRECTORY"/out.add'
+test_expect_success ADD_OUT 'add output on unwritable repository' '
+	cat >expect <<-\EOF &&
+	error: insufficient permission for adding an object to repository database .git/objects
+	error: file: failed to insert into database
+	error: unable to index file '\''file'\''
+	fatal: updating files failed
+	EOF
+	test_cmp expect out.add
 '
 
 test_done
diff --git a/t/t0005-signals.sh b/t/t0005-signals.sh
index 4c214bd..eba75a2 100755
--- a/t/t0005-signals.sh
+++ b/t/t0005-signals.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='signals work as we expect'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 cat >expect <<EOF
@@ -46,7 +48,7 @@ test_expect_success !MINGW 'a constipated git dies with SIGPIPE' '
 '
 
 test_expect_success !MINGW 'a constipated git dies with SIGPIPE even if parent ignores it' '
-	OUT=$( ((trap "" PIPE; large_git; echo $? 1>&3) | :) 3>&1 ) &&
+	OUT=$( ((trap "" PIPE && large_git; echo $? 1>&3) | :) 3>&1 ) &&
 	test_match_signal 13 "$OUT"
 '
 
diff --git a/t/t0006-date.sh b/t/t0006-date.sh
index 75ee9a9..3031256 100755
--- a/t/t0006-date.sh
+++ b/t/t0006-date.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='test date parsing and printing'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # arbitrary reference time: 2009-08-30 19:20:00
@@ -11,7 +13,7 @@ check_relative() {
 	echo "$t -> $2" >expect
 	test_expect_${3:-success} "relative date ($2)" "
 	test-tool date relative $t >actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 	"
 }
 
@@ -44,6 +46,7 @@ check_show () {
 TIME='1466000000 +0200'
 check_show iso8601 "$TIME" '2016-06-15 16:13:20 +0200'
 check_show iso8601-strict "$TIME" '2016-06-15T16:13:20+02:00'
+check_show iso8601-strict "$(echo "$TIME" | sed 's/+0200$/+0000/')" '2016-06-15T14:13:20Z'
 check_show rfc2822 "$TIME" 'Wed, 15 Jun 2016 16:13:20 +0200'
 check_show short "$TIME" '2016-06-15'
 check_show default "$TIME" 'Wed Jun 15 16:13:20 2016 +0200'
@@ -63,6 +66,18 @@ check_show 'format-local:%%z' "$TIME" '%z'
 check_show 'format:%Y-%m-%d %H:%M:%S' "$TIME" '2016-06-15 16:13:20'
 check_show 'format-local:%Y-%m-%d %H:%M:%S' "$TIME" '2016-06-15 09:13:20' '' EST5
 
+check_show 'format:%s' '123456789 +1234' 123456789
+check_show 'format:%s' '123456789 -1234' 123456789
+check_show 'format-local:%s' '123456789 -1234' 123456789
+
+# negative TZ offset
+TIME='1466000000 -0200'
+check_show iso8601 "$TIME" '2016-06-15 12:13:20 -0200'
+check_show iso8601-strict "$TIME" '2016-06-15T12:13:20-02:00'
+check_show rfc2822 "$TIME" 'Wed, 15 Jun 2016 12:13:20 -0200'
+check_show default "$TIME" 'Wed Jun 15 12:13:20 2016 -0200'
+check_show raw "$TIME" '1466000000 -0200'
+
 # arbitrary time absurdly far in the future
 FUTURE="5758122296 -0400"
 check_show iso       "$FUTURE" "2152-06-19 18:24:56 -0400" TIME_IS_64BIT,TIME_T_IS_64BIT
@@ -82,6 +97,13 @@ check_parse 2008-02-14 bad
 check_parse '2008-02-14 20:30:45' '2008-02-14 20:30:45 +0000'
 check_parse '2008-02-14 20:30:45 -0500' '2008-02-14 20:30:45 -0500'
 check_parse '2008.02.14 20:30:45 -0500' '2008-02-14 20:30:45 -0500'
+check_parse '20080214T20:30:45' '2008-02-14 20:30:45 +0000'
+check_parse '20080214T20:30' '2008-02-14 20:30:00 +0000'
+check_parse '20080214T20' '2008-02-14 20:00:00 +0000'
+check_parse '20080214T203045' '2008-02-14 20:30:45 +0000'
+check_parse '20080214T2030' '2008-02-14 20:30:00 +0000'
+check_parse '20080214T000000.20' '2008-02-14 00:00:00 +0000'
+check_parse '20080214T00:00:00.20' '2008-02-14 00:00:00 +0000'
 check_parse '20080214T203045-04:00' '2008-02-14 20:30:45 -0400'
 check_parse '20080214T203045 -04:00' '2008-02-14 20:30:45 -0400'
 check_parse '20080214T203045.019-04:00' '2008-02-14 20:30:45 -0400'
@@ -93,6 +115,7 @@ check_parse '2008-02-14 20:30:45 -05' '2008-02-14 20:30:45 -0500'
 check_parse '2008-02-14 20:30:45 -:30' '2008-02-14 20:30:45 +0000'
 check_parse '2008-02-14 20:30:45 -05:00' '2008-02-14 20:30:45 -0500'
 check_parse '2008-02-14 20:30:45' '2008-02-14 20:30:45 -0500' EST5
+check_parse 'Thu, 7 Apr 2005 15:14:13 -0700' '2005-04-07 15:14:13 -0700'
 
 check_approxidate() {
 	echo "$1 -> $2 +0000" >expect
@@ -139,7 +162,7 @@ check_date_format_human() {
 	echo "$t -> $2" >expect
 	test_expect_success "human date $t" '
 		test-tool date human $t >actual &&
-		test_i18ncmp expect actual
+		test_cmp expect actual
 '
 }
 
diff --git a/t/t0007-git-var.sh b/t/t0007-git-var.sh
index 88b9ae8..ff4fd93 100755
--- a/t/t0007-git-var.sh
+++ b/t/t0007-git-var.sh
@@ -1,8 +1,16 @@
 #!/bin/sh
 
 test_description='basic sanity checks for git var'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
+sane_unset_all_editors () {
+	sane_unset GIT_EDITOR &&
+	sane_unset VISUAL &&
+	sane_unset EDITOR
+}
+
 test_expect_success 'get GIT_AUTHOR_IDENT' '
 	test_tick &&
 	echo "$GIT_AUTHOR_NAME <$GIT_AUTHOR_EMAIL> $GIT_AUTHOR_DATE" >expect &&
@@ -25,6 +33,198 @@ test_expect_success !FAIL_PREREQS,!AUTOIDENT 'requested identities are strict' '
 	)
 '
 
+test_expect_success 'get GIT_DEFAULT_BRANCH without configuration' '
+	(
+		sane_unset GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME &&
+		git init defbranch &&
+		git -C defbranch symbolic-ref --short HEAD >expect &&
+		git var GIT_DEFAULT_BRANCH >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'get GIT_DEFAULT_BRANCH with configuration' '
+	test_config init.defaultbranch foo &&
+	(
+		sane_unset GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME &&
+		echo foo >expect &&
+		git var GIT_DEFAULT_BRANCH >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'get GIT_EDITOR without configuration' '
+	(
+		sane_unset_all_editors &&
+		test_expect_code 1 git var GIT_EDITOR >out &&
+		test_must_be_empty out
+	)
+'
+
+test_expect_success 'get GIT_EDITOR with configuration' '
+	test_config core.editor foo &&
+	(
+		sane_unset_all_editors &&
+		echo foo >expect &&
+		git var GIT_EDITOR >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'get GIT_EDITOR with environment variable GIT_EDITOR' '
+	(
+		sane_unset_all_editors &&
+		echo bar >expect &&
+		GIT_EDITOR=bar git var GIT_EDITOR >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'get GIT_EDITOR with environment variable EDITOR' '
+	(
+		sane_unset_all_editors &&
+		echo bar >expect &&
+		EDITOR=bar git var GIT_EDITOR >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'get GIT_EDITOR with configuration and environment variable GIT_EDITOR' '
+	test_config core.editor foo &&
+	(
+		sane_unset_all_editors &&
+		echo bar >expect &&
+		GIT_EDITOR=bar git var GIT_EDITOR >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'get GIT_EDITOR with configuration and environment variable EDITOR' '
+	test_config core.editor foo &&
+	(
+		sane_unset_all_editors &&
+		echo foo >expect &&
+		EDITOR=bar git var GIT_EDITOR >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'get GIT_SEQUENCE_EDITOR without configuration' '
+	(
+		sane_unset GIT_SEQUENCE_EDITOR &&
+		git var GIT_EDITOR >expect &&
+		git var GIT_SEQUENCE_EDITOR >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'get GIT_SEQUENCE_EDITOR with configuration' '
+	test_config sequence.editor foo &&
+	(
+		sane_unset GIT_SEQUENCE_EDITOR &&
+		echo foo >expect &&
+		git var GIT_SEQUENCE_EDITOR >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'get GIT_SEQUENCE_EDITOR with environment variable' '
+	(
+		sane_unset GIT_SEQUENCE_EDITOR &&
+		echo bar >expect &&
+		GIT_SEQUENCE_EDITOR=bar git var GIT_SEQUENCE_EDITOR >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'get GIT_SEQUENCE_EDITOR with configuration and environment variable' '
+	test_config sequence.editor foo &&
+	(
+		sane_unset GIT_SEQUENCE_EDITOR &&
+		echo bar >expect &&
+		GIT_SEQUENCE_EDITOR=bar git var GIT_SEQUENCE_EDITOR >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success POSIXPERM 'GIT_SHELL_PATH points to a valid executable' '
+	shellpath=$(git var GIT_SHELL_PATH) &&
+	test_path_is_executable "$shellpath"
+'
+
+# We know in this environment that our shell will be one of a few fixed values
+# that all end in "sh".
+test_expect_success MINGW 'GIT_SHELL_PATH points to a suitable shell' '
+	shellpath=$(git var GIT_SHELL_PATH) &&
+	case "$shellpath" in
+	*sh) ;;
+	*) return 1;;
+	esac
+'
+
+test_expect_success 'GIT_ATTR_SYSTEM produces expected output' '
+	test_must_fail env GIT_ATTR_NOSYSTEM=1 git var GIT_ATTR_SYSTEM &&
+	(
+		sane_unset GIT_ATTR_NOSYSTEM &&
+		systempath=$(git var GIT_ATTR_SYSTEM) &&
+		test "$systempath" != ""
+	)
+'
+
+test_expect_success 'GIT_ATTR_GLOBAL points to the correct location' '
+	TRASHDIR="$(test-tool path-utils normalize_path_copy "$(pwd)")" &&
+	globalpath=$(XDG_CONFIG_HOME="$TRASHDIR/.config" git var GIT_ATTR_GLOBAL) &&
+	test "$globalpath" = "$TRASHDIR/.config/git/attributes" &&
+	(
+		sane_unset XDG_CONFIG_HOME &&
+		globalpath=$(HOME="$TRASHDIR" git var GIT_ATTR_GLOBAL) &&
+		test "$globalpath" = "$TRASHDIR/.config/git/attributes"
+	)
+'
+
+test_expect_success 'GIT_CONFIG_SYSTEM points to the correct location' '
+	TRASHDIR="$(test-tool path-utils normalize_path_copy "$(pwd)")" &&
+	test_must_fail env GIT_CONFIG_NOSYSTEM=1 git var GIT_CONFIG_SYSTEM &&
+	(
+		sane_unset GIT_CONFIG_NOSYSTEM &&
+		systempath=$(git var GIT_CONFIG_SYSTEM) &&
+		test "$systempath" != "" &&
+		systempath=$(GIT_CONFIG_SYSTEM=/dev/null git var GIT_CONFIG_SYSTEM) &&
+		if test_have_prereq MINGW
+		then
+			test "$systempath" = "nul"
+		else
+			test "$systempath" = "/dev/null"
+		fi &&
+		systempath=$(GIT_CONFIG_SYSTEM="$TRASHDIR/gitconfig" git var GIT_CONFIG_SYSTEM) &&
+		test "$systempath" = "$TRASHDIR/gitconfig"
+	)
+'
+
+test_expect_success 'GIT_CONFIG_GLOBAL points to the correct location' '
+	TRASHDIR="$(test-tool path-utils normalize_path_copy "$(pwd)")" &&
+	HOME="$TRASHDIR" XDG_CONFIG_HOME="$TRASHDIR/foo" git var GIT_CONFIG_GLOBAL >actual &&
+	echo "$TRASHDIR/foo/git/config" >expected &&
+	echo "$TRASHDIR/.gitconfig" >>expected &&
+	test_cmp expected actual &&
+	(
+		sane_unset XDG_CONFIG_HOME &&
+		HOME="$TRASHDIR" git var GIT_CONFIG_GLOBAL >actual &&
+		echo "$TRASHDIR/.config/git/config" >expected &&
+		echo "$TRASHDIR/.gitconfig" >>expected &&
+		test_cmp expected actual &&
+		globalpath=$(GIT_CONFIG_GLOBAL=/dev/null git var GIT_CONFIG_GLOBAL) &&
+		if test_have_prereq MINGW
+		then
+			test "$globalpath" = "nul"
+		else
+			test "$globalpath" = "/dev/null"
+		fi &&
+		globalpath=$(GIT_CONFIG_GLOBAL="$TRASHDIR/gitconfig" git var GIT_CONFIG_GLOBAL) &&
+		test "$globalpath" = "$TRASHDIR/gitconfig"
+	)
+'
+
 # For git var -l, we check only a representative variable;
 # testing the whole output would make our test too brittle with
 # respect to unrelated changes in the test suite's environment.
@@ -42,8 +242,39 @@ test_expect_success 'git var -l lists config' '
 	test_cmp expect actual.bare
 '
 
+test_expect_success 'git var -l lists multiple global configs' '
+	TRASHDIR="$(test-tool path-utils normalize_path_copy "$(pwd)")" &&
+	HOME="$TRASHDIR" XDG_CONFIG_HOME="$TRASHDIR/foo" git var -l >actual &&
+	grep "^GIT_CONFIG_GLOBAL=" actual >filtered &&
+	echo "GIT_CONFIG_GLOBAL=$TRASHDIR/foo/git/config" >expected &&
+	echo "GIT_CONFIG_GLOBAL=$TRASHDIR/.gitconfig" >>expected &&
+	test_cmp expected filtered
+'
+
+test_expect_success 'git var -l does not split multiline editors' '
+	(
+		GIT_EDITOR="!f() {
+			echo Hello!
+		}; f" &&
+		export GIT_EDITOR &&
+		echo "GIT_EDITOR=$GIT_EDITOR" >expected &&
+		git var -l >var &&
+		sed -n -e "/^GIT_EDITOR/,\$p" var | head -n 3 >actual &&
+		test_cmp expected actual
+	)
+'
+
 test_expect_success 'listing and asking for variables are exclusive' '
 	test_must_fail git var -l GIT_COMMITTER_IDENT
 '
 
+test_expect_success '`git var -l` works even without HOME' '
+	(
+		XDG_CONFIG_HOME= &&
+		export XDG_CONFIG_HOME &&
+		unset HOME &&
+		git var -l
+	)
+'
+
 test_done
diff --git a/t/t0008-ignores.sh b/t/t0008-ignores.sh
index 370a389..361446b 100755
--- a/t/t0008-ignores.sh
+++ b/t/t0008-ignores.sh
@@ -2,6 +2,8 @@
 
 test_description=check-ignore
 
+TEST_PASSES_SANITIZE_LEAK=true
+TEST_CREATE_REPO_NO_TEMPLATE=1
 . ./test-lib.sh
 
 init_vars () {
@@ -34,7 +36,7 @@ expect_from_stdin () {
 test_stderr () {
 	expected="$1"
 	expect_in stderr "$1" &&
-	test_i18ncmp "$HOME/expected-stderr" "$HOME/stderr"
+	test_cmp "$HOME/expected-stderr" "$HOME/stderr"
 }
 
 broken_c_unquote () {
@@ -47,7 +49,7 @@ broken_c_unquote_verbose () {
 
 stderr_contains () {
 	regexp="$1"
-	if test_i18ngrep "$regexp" "$HOME/stderr"
+	if test_grep "$regexp" "$HOME/stderr"
 	then
 		return 0
 	else
@@ -199,7 +201,7 @@ test_expect_success 'setup' '
 	do
 		: >$dir/not-ignored &&
 		: >$dir/ignored-and-untracked &&
-		: >$dir/ignored-but-in-index
+		: >$dir/ignored-but-in-index || return 1
 	done &&
 	git add -f ignored-but-in-index a/ignored-but-in-index &&
 	cat <<-\EOF >a/.gitignore &&
@@ -224,7 +226,8 @@ test_expect_success 'setup' '
 		!globaltwo
 		globalthree
 	EOF
-	cat <<-\EOF >>.git/info/exclude
+	mkdir .git/info &&
+	cat <<-\EOF >.git/info/exclude
 		per-repo
 	EOF
 '
@@ -542,9 +545,9 @@ test_expect_success_multi 'submodule from subdirectory' '' '
 
 test_expect_success 'global ignore not yet enabled' '
 	expect_from_stdin <<-\EOF &&
-		.git/info/exclude:7:per-repo	per-repo
+		.git/info/exclude:1:per-repo	per-repo
 		a/.gitignore:2:*three	a/globalthree
-		.git/info/exclude:7:per-repo	a/per-repo
+		.git/info/exclude:1:per-repo	a/per-repo
 	EOF
 	test_check_ignore "-v globalone per-repo a/globalthree a/per-repo not-ignored a/globaltwo"
 '
@@ -565,10 +568,10 @@ test_expect_success 'global ignore with -v' '
 	enable_global_excludes &&
 	expect_from_stdin <<-EOF &&
 		$global_excludes:1:globalone	globalone
-		.git/info/exclude:7:per-repo	per-repo
+		.git/info/exclude:1:per-repo	per-repo
 		$global_excludes:3:globalthree	globalthree
 		a/.gitignore:2:*three	a/globalthree
-		.git/info/exclude:7:per-repo	a/per-repo
+		.git/info/exclude:1:per-repo	a/per-repo
 		$global_excludes:2:!globaltwo	globaltwo
 	EOF
 	test_check_ignore "-v globalone per-repo globalthree a/globalthree a/per-repo not-ignored globaltwo"
@@ -802,6 +805,49 @@ test_expect_success 'existing directory and file' '
 	grep top-level-dir actual
 '
 
+test_expect_success 'exact prefix matching (with root)' '
+	test_when_finished rm -r a &&
+	mkdir -p a/git a/git-foo &&
+	touch a/git/foo a/git-foo/bar &&
+	echo /git/ >a/.gitignore &&
+	git check-ignore a/git a/git/foo a/git-foo a/git-foo/bar >actual &&
+	cat >expect <<-\EOF &&
+	a/git
+	a/git/foo
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'exact prefix matching (without root)' '
+	test_when_finished rm -r a &&
+	mkdir -p a/git a/git-foo &&
+	touch a/git/foo a/git-foo/bar &&
+	echo git/ >a/.gitignore &&
+	git check-ignore a/git a/git/foo a/git-foo a/git-foo/bar >actual &&
+	cat >expect <<-\EOF &&
+	a/git
+	a/git/foo
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'directories and ** matches' '
+	cat >.gitignore <<-\EOF &&
+	data/**
+	!data/**/
+	!data/**/*.txt
+	EOF
+	git check-ignore file \
+		data/file data/data1/file1 data/data1/file1.txt \
+		data/data2/file2 data/data2/file2.txt >actual &&
+	cat >expect <<-\EOF &&
+	data/file
+	data/data1/file1
+	data/data2/file2
+	EOF
+	test_cmp expect actual
+'
+
 ############################################################################
 #
 # test whitespace handling
@@ -865,4 +911,38 @@ test_expect_success 'info/exclude trumps core.excludesfile' '
 	test_cmp expect actual
 '
 
+test_expect_success SYMLINKS 'set up ignore file for symlink tests' '
+	echo "*" >ignore &&
+	rm -f .gitignore .git/info/exclude
+'
+
+test_expect_success SYMLINKS 'symlinks respected in core.excludesFile' '
+	test_when_finished "rm symlink" &&
+	ln -s ignore symlink &&
+	test_config core.excludesFile "$(pwd)/symlink" &&
+	echo file >expect &&
+	git check-ignore file >actual 2>err &&
+	test_cmp expect actual &&
+	test_must_be_empty err
+'
+
+test_expect_success SYMLINKS 'symlinks respected in info/exclude' '
+	test_when_finished "rm .git/info/exclude" &&
+	ln -s ../../ignore .git/info/exclude &&
+	echo file >expect &&
+	git check-ignore file >actual 2>err &&
+	test_cmp expect actual &&
+	test_must_be_empty err
+'
+
+test_expect_success SYMLINKS 'symlinks not respected in-tree' '
+	test_when_finished "rm .gitignore" &&
+	ln -s ignore .gitignore &&
+	mkdir subdir &&
+	ln -s ignore subdir/.gitignore &&
+	test_must_fail git check-ignore subdir/file >actual 2>err &&
+	test_must_be_empty actual &&
+	test_grep "unable to access.*gitignore" err
+'
+
 test_done
diff --git a/t/t0009-prio-queue.sh b/t/t0009-prio-queue.sh
deleted file mode 100755
index 3941ad2..0000000
--- a/t/t0009-prio-queue.sh
+++ /dev/null
@@ -1,64 +0,0 @@
-#!/bin/sh
-
-test_description='basic tests for priority queue implementation'
-. ./test-lib.sh
-
-cat >expect <<'EOF'
-1
-2
-3
-4
-5
-5
-6
-7
-8
-9
-10
-EOF
-test_expect_success 'basic ordering' '
-	test-tool prio-queue 2 6 3 10 9 5 7 4 5 8 1 dump >actual &&
-	test_cmp expect actual
-'
-
-cat >expect <<'EOF'
-2
-3
-4
-1
-5
-6
-EOF
-test_expect_success 'mixed put and get' '
-	test-tool prio-queue 6 2 4 get 5 3 get get 1 dump >actual &&
-	test_cmp expect actual
-'
-
-cat >expect <<'EOF'
-1
-2
-NULL
-1
-2
-NULL
-EOF
-test_expect_success 'notice empty queue' '
-	test-tool prio-queue 1 2 get get get 1 2 get get get >actual &&
-	test_cmp expect actual
-'
-
-cat >expect <<'EOF'
-3
-2
-6
-4
-5
-1
-8
-EOF
-test_expect_success 'stack order' '
-	test-tool prio-queue stack 8 1 5 4 6 2 3 dump >actual &&
-	test_cmp expect actual
-'
-
-test_done
diff --git a/t/t0010-racy-git.sh b/t/t0010-racy-git.sh
index 5657c5a..84172a3 100755
--- a/t/t0010-racy-git.sh
+++ b/t/t0010-racy-git.sh
@@ -2,6 +2,7 @@
 
 test_description='racy GIT'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # This test can give false success if your machine is sufficiently
@@ -9,25 +10,24 @@ test_description='racy GIT'
 
 for trial in 0 1 2 3 4
 do
-	rm -f .git/index
-	echo frotz >infocom
-	git update-index --add infocom
-	echo xyzzy >infocom
-
-	files=$(git diff-files -p)
-	test_expect_success \
-	"Racy GIT trial #$trial part A" \
-	'test "" != "$files"'
-
+	test_expect_success "Racy git trial #$trial part A" '
+		rm -f .git/index &&
+		echo frotz >infocom &&
+		git update-index --add infocom &&
+		echo xyzzy >infocom &&
+
+		git diff-files -p >out &&
+		test_file_not_empty out
+	'
 	sleep 1
-	echo xyzzy >cornerstone
-	git update-index --add cornerstone
 
-	files=$(git diff-files -p)
-	test_expect_success \
-	"Racy GIT trial #$trial part B" \
-	'test "" != "$files"'
+	test_expect_success "Racy git trial #$trial part B" '
+		echo xyzzy >cornerstone &&
+		git update-index --add cornerstone &&
 
+		git diff-files -p >out &&
+		test_file_not_empty out
+	'
 done
 
 test_done
diff --git a/t/t0011-hashmap.sh b/t/t0011-hashmap.sh
index 5343ffd..46e74ad 100755
--- a/t/t0011-hashmap.sh
+++ b/t/t0011-hashmap.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='test hashmap and string hash functions'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_hashmap() {
@@ -218,7 +220,7 @@ test_expect_success 'grow / shrink' '
 	for n in $(test_seq 51)
 	do
 		echo put key$n value$n >> in &&
-		echo NULL >> expect
+		echo NULL >> expect || return 1
 	done &&
 	echo size >> in &&
 	echo 64 51 >> expect &&
@@ -229,7 +231,7 @@ test_expect_success 'grow / shrink' '
 	for n in $(test_seq 12)
 	do
 		echo remove key$n >> in &&
-		echo value$n >> expect
+		echo value$n >> expect || return 1
 	done &&
 	echo size >> in &&
 	echo 256 40 >> expect &&
@@ -237,7 +239,7 @@ test_expect_success 'grow / shrink' '
 	echo value40 >> expect &&
 	echo size >> in &&
 	echo 64 39 >> expect &&
-	cat in | test-tool hashmap > out &&
+	test-tool hashmap <in >out &&
 	test_cmp expect out
 
 '
diff --git a/t/t0012-help.sh b/t/t0012-help.sh
index e8ef730..1d273d9 100755
--- a/t/t0012-help.sh
+++ b/t/t0012-help.sh
@@ -34,6 +34,46 @@ test_expect_success 'basic help commands' '
 	git help -a >/dev/null
 '
 
+test_expect_success 'invalid usage' '
+	test_expect_code 129 git help -a add &&
+	test_expect_code 129 git help --all add &&
+
+	test_expect_code 129 git help -g add &&
+	test_expect_code 129 git help -a -c &&
+
+	test_expect_code 129 git help -g add &&
+	test_expect_code 129 git help -a -g &&
+
+	test_expect_code 129 git help --user-interfaces add &&
+
+	test_expect_code 129 git help -g -c &&
+	test_expect_code 129 git help --config-for-completion add &&
+	test_expect_code 129 git help --config-sections-for-completion add
+'
+
+for opt in '-a' '-g' '-c' '--config-for-completion' '--config-sections-for-completion'
+do
+	test_expect_success "invalid usage of '$opt' with [-i|-m|-w]" '
+		git help $opt &&
+		test_expect_code 129 git help $opt -i &&
+		test_expect_code 129 git help $opt -m &&
+		test_expect_code 129 git help $opt -w
+	'
+
+	if test "$opt" = "-a"
+	then
+		continue
+	fi
+
+	test_expect_success "invalid usage of '$opt' with --no-external-commands" '
+		test_expect_code 129 git help $opt --no-external-commands
+	'
+
+	test_expect_success "invalid usage of '$opt' with --no-aliases" '
+		test_expect_code 129 git help $opt --no-external-commands
+	'
+done
+
 test_expect_success "works for commands and guides by default" '
 	configure_help &&
 	git help status &&
@@ -55,33 +95,169 @@ test_expect_success "--help does not work for guides" "
 		git: 'revisions' is not a git command. See 'git --help'.
 	EOF
 	test_must_fail git revisions --help 2>actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 "
 
 test_expect_success 'git help' '
 	git help >help.output &&
-	test_i18ngrep "^   clone  " help.output &&
-	test_i18ngrep "^   add    " help.output &&
-	test_i18ngrep "^   log    " help.output &&
-	test_i18ngrep "^   commit " help.output &&
-	test_i18ngrep "^   fetch  " help.output
+	test_grep "^   clone  " help.output &&
+	test_grep "^   add    " help.output &&
+	test_grep "^   log    " help.output &&
+	test_grep "^   commit " help.output &&
+	test_grep "^   fetch  " help.output
 '
+
 test_expect_success 'git help -g' '
 	git help -g >help.output &&
-	test_i18ngrep "^   attributes " help.output &&
-	test_i18ngrep "^   everyday   " help.output &&
-	test_i18ngrep "^   tutorial   " help.output
+	test_grep "^   everyday   " help.output &&
+	test_grep "^   tutorial   " help.output
+'
+
+test_expect_success 'git help fails for non-existing html pages' '
+	configure_help &&
+	mkdir html-empty &&
+	test_must_fail git -c help.htmlpath=html-empty help status &&
+	test_must_be_empty test-browser.log
+'
+
+test_expect_success 'git help succeeds without git.html' '
+	configure_help &&
+	mkdir html-with-docs &&
+	touch html-with-docs/git-status.html &&
+	git -c help.htmlpath=html-with-docs help status &&
+	echo "html-with-docs/git-status.html" >expect &&
+	test_cmp expect test-browser.log
+'
+
+test_expect_success 'git help --user-interfaces' '
+	git help --user-interfaces >help.output &&
+	grep "^   attributes   " help.output &&
+	grep "^   mailmap   " help.output
+'
+
+test_expect_success 'git help -c' '
+	git help -c >help.output &&
+	cat >expect <<-\EOF &&
+
+	'\''git help config'\'' for more information
+	EOF
+	grep -v -E \
+		-e "^[^.]+\.[^.]+$" \
+		-e "^[^.]+\.[^.]+\.[^.]+$" \
+		help.output >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'git help --config-for-completion' '
+	git help -c >human &&
+	grep -E \
+	     -e "^[^.]+\.[^.]+$" \
+	     -e "^[^.]+\.[^.]+\.[^.]+$" human |
+	     sed -e "s/\*.*//" -e "s/<.*//" |
+	     sort -u >human.munged &&
+
+	git help --config-for-completion >vars &&
+	test_cmp human.munged vars
+'
+
+test_expect_success 'git help --config-sections-for-completion' '
+	git help -c >human &&
+	grep -E \
+	     -e "^[^.]+\.[^.]+$" \
+	     -e "^[^.]+\.[^.]+\.[^.]+$" human |
+	     sed -e "s/\..*//" |
+	     sort -u >human.munged &&
+
+	git help --config-sections-for-completion >sections &&
+	test_cmp human.munged sections
+'
+
+test_section_spacing () {
+	cat >expect &&
+	"$@" >out &&
+	grep -E "(^[^ ]|^$)" out >actual
+}
+
+test_section_spacing_trailer () {
+	test_section_spacing "$@" &&
+	test_expect_code 1 git >out &&
+	sed -n '/list available subcommands/,$p' <out >>expect
+}
+
+
+for cmd in git "git help"
+do
+	test_expect_success "'$cmd' section spacing" '
+		test_section_spacing_trailer git help <<-\EOF &&
+		usage: git [-v | --version] [-h | --help] [-C <path>] [-c <name>=<value>]
+
+		These are common Git commands used in various situations:
+
+		start a working area (see also: git help tutorial)
+
+		work on the current change (see also: git help everyday)
+
+		examine the history and state (see also: git help revisions)
+
+		grow, mark and tweak your common history
+
+		collaborate (see also: git help workflows)
+
+		EOF
+		test_cmp expect actual
+	'
+done
+
+test_expect_success "'git help -a' section spacing" '
+	test_section_spacing \
+		git help -a --no-external-commands --no-aliases <<-\EOF &&
+	See '\''git help <command>'\'' to read about a specific subcommand
+
+	Main Porcelain Commands
+
+	Ancillary Commands / Manipulators
+
+	Ancillary Commands / Interrogators
+
+	Interacting with Others
+
+	Low-level Commands / Manipulators
+
+	Low-level Commands / Interrogators
+
+	Low-level Commands / Syncing Repositories
+
+	Low-level Commands / Internal Helpers
+
+	User-facing repository, command and file interfaces
+
+	Developer-facing file formats, protocols and other interfaces
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success "'git help -g' section spacing" '
+	test_section_spacing_trailer git help -g <<-\EOF &&
+	The Git concept guides are:
+
+	EOF
+	test_cmp expect actual
 '
 
 test_expect_success 'generate builtin list' '
+	mkdir -p sub &&
 	git --list-cmds=builtins >builtins
 '
 
 while read builtin
 do
 	test_expect_success "$builtin can handle -h" '
-		test_expect_code 129 git $builtin -h >output 2>&1 &&
-		test_i18ngrep usage output
+		(
+			GIT_CEILING_DIRECTORIES=$(pwd) &&
+			export GIT_CEILING_DIRECTORIES &&
+			test_expect_code 129 git -C sub $builtin -h >output 2>&1
+		) &&
+		test_grep usage output
 	'
 done <builtins
 
diff --git a/t/t0013-sha1dc.sh b/t/t0013-sha1dc.sh
index 419f31a..0881417 100755
--- a/t/t0013-sha1dc.sh
+++ b/t/t0013-sha1dc.sh
@@ -1,18 +1,22 @@
 #!/bin/sh
 
 test_description='test sha1 collision detection'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 TEST_DATA="$TEST_DIRECTORY/t0013"
 
-if test -z "$DC_SHA1"
+test_lazy_prereq SHA1_IS_SHA1DC 'test-tool sha1-is-sha1dc'
+
+if ! test_have_prereq SHA1_IS_SHA1DC
 then
-	skip_all='skipping sha1 collision tests, DC_SHA1 not set'
+	skip_all='skipping sha1 collision tests, not using sha1collisiondetection'
 	test_done
 fi
 
 test_expect_success 'test-sha1 detects shattered pdf' '
 	test_must_fail test-tool sha1 <"$TEST_DATA/shattered-1.pdf" 2>err &&
-	test_i18ngrep collision err &&
+	test_grep collision err &&
 	grep 38762cf7f55934b34d179ae6a4c80cadccbb7f0a err
 '
 
diff --git a/t/t0014-alias.sh b/t/t0014-alias.sh
index 8d3d914..9556834 100755
--- a/t/t0014-alias.sh
+++ b/t/t0014-alias.sh
@@ -8,7 +8,7 @@ test_expect_success 'nested aliases - internal execution' '
 	git config alias.nested-internal-1 nested-internal-2 &&
 	git config alias.nested-internal-2 status &&
 	git nested-internal-1 >output &&
-	test_i18ngrep "^On branch " output
+	test_grep "^On branch " output
 '
 
 test_expect_success 'nested aliases - mixed execution' '
@@ -16,7 +16,7 @@ test_expect_success 'nested aliases - mixed execution' '
 	git config alias.nested-external-2 "!git nested-external-3" &&
 	git config alias.nested-external-3 status &&
 	git nested-external-1 >output &&
-	test_i18ngrep "^On branch " output
+	test_grep "^On branch " output
 '
 
 test_expect_success 'looping aliases - internal execution' '
@@ -24,7 +24,7 @@ test_expect_success 'looping aliases - internal execution' '
 	git config alias.loop-internal-2 loop-internal-3 &&
 	git config alias.loop-internal-3 loop-internal-2 &&
 	test_must_fail git loop-internal-1 2>output &&
-	test_i18ngrep "^fatal: alias loop detected: expansion of" output
+	test_grep "^fatal: alias loop detected: expansion of" output
 '
 
 # This test is disabled until external loops are fixed, because would block
@@ -34,7 +34,7 @@ test_expect_success 'looping aliases - internal execution' '
 #	git config alias.loop-mixed-1 loop-mixed-2 &&
 #	git config alias.loop-mixed-2 "!git loop-mixed-1" &&
 #	test_must_fail git loop-mixed-1 2>output &&
-#	test_i18ngrep "^fatal: alias loop detected: expansion of" output
+#	test_grep "^fatal: alias loop detected: expansion of" output
 #'
 
 test_expect_success 'run-command formats empty args properly' '
diff --git a/t/t0015-hash.sh b/t/t0015-hash.sh
index 291e906..0a087a1 100755
--- a/t/t0015-hash.sh
+++ b/t/t0015-hash.sh
@@ -1,8 +1,9 @@
 #!/bin/sh
 
 test_description='test basic hash implementation'
-. ./test-lib.sh
 
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
 
 test_expect_success 'test basic SHA-1 hash values' '
 	test-tool sha1 </dev/null >actual &&
@@ -15,7 +16,7 @@ test_expect_success 'test basic SHA-1 hash values' '
 	grep c12252ceda8be8994d5fa0290a47231c1d16aae3 actual &&
 	printf "abcdefghijklmnopqrstuvwxyz" | test-tool sha1 >actual &&
 	grep 32d10c7b8cf96570ca04ce37f2a19d84240d3a89 actual &&
-	perl -e "$| = 1; print q{aaaaaaaaaa} for 1..100000;" | \
+	perl -e "$| = 1; print q{aaaaaaaaaa} for 1..100000;" |
 		test-tool sha1 >actual &&
 	grep 34aa973cd4c4daa4f61eeb2bdbad27316534016f actual &&
 	printf "blob 0\0" | test-tool sha1 >actual &&
@@ -38,10 +39,10 @@ test_expect_success 'test basic SHA-256 hash values' '
 	printf "abcdefghijklmnopqrstuvwxyz" | test-tool sha256 >actual &&
 	grep 71c480df93d6ae2f1efad1447c66c9525e316218cf51fc8d9ed832f2daf18b73 actual &&
 	# Try to exercise the chunking code by turning autoflush on.
-	perl -e "$| = 1; print q{aaaaaaaaaa} for 1..100000;" | \
+	perl -e "$| = 1; print q{aaaaaaaaaa} for 1..100000;" |
 		test-tool sha256 >actual &&
 	grep cdc76e5c9914fb9281a1c7e284d73e67f1809a48a497200e046d39ccc7112cd0 actual &&
-	perl -e "$| = 1; print q{abcdefghijklmnopqrstuvwxyz} for 1..100000;" | \
+	perl -e "$| = 1; print q{abcdefghijklmnopqrstuvwxyz} for 1..100000;" |
 		test-tool sha256 >actual &&
 	grep e406ba321ca712ad35a698bf0af8d61fc4dc40eca6bdcea4697962724ccbde35 actual &&
 	printf "blob 0\0" | test-tool sha256 >actual &&
diff --git a/t/t0016-oidmap.sh b/t/t0016-oidmap.sh
index 31f8276..0faef1f 100755
--- a/t/t0016-oidmap.sh
+++ b/t/t0016-oidmap.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='test oidmap'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # This purposefully is very similar to t0011-hashmap.sh
diff --git a/t/t0017-env-helper.sh b/t/t0017-env-helper.sh
index c1ecf6a..fc14ba0 100755
--- a/t/t0017-env-helper.sh
+++ b/t/t0017-env-helper.sh
@@ -1,99 +1,100 @@
 #!/bin/sh
 
-test_description='test env--helper'
+test_description='test test-tool env-helper'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 
-test_expect_success 'env--helper usage' '
-	test_must_fail git env--helper &&
-	test_must_fail git env--helper --type=bool &&
-	test_must_fail git env--helper --type=ulong &&
-	test_must_fail git env--helper --type=bool &&
-	test_must_fail git env--helper --type=bool --default &&
-	test_must_fail git env--helper --type=bool --default= &&
-	test_must_fail git env--helper --defaultxyz
+test_expect_success 'test-tool env-helper usage' '
+	test_must_fail test-tool env-helper &&
+	test_must_fail test-tool env-helper --type=bool &&
+	test_must_fail test-tool env-helper --type=ulong &&
+	test_must_fail test-tool env-helper --type=bool &&
+	test_must_fail test-tool env-helper --type=bool --default &&
+	test_must_fail test-tool env-helper --type=bool --default= &&
+	test_must_fail test-tool env-helper --defaultxyz
 '
 
-test_expect_success 'env--helper bad default values' '
-	test_must_fail git env--helper --type=bool --default=1xyz MISSING &&
-	test_must_fail git env--helper --type=ulong --default=1xyz MISSING
+test_expect_success 'test-tool env-helper bad default values' '
+	test_must_fail test-tool env-helper --type=bool --default=1xyz MISSING &&
+	test_must_fail test-tool env-helper --type=ulong --default=1xyz MISSING
 '
 
-test_expect_success 'env--helper --type=bool' '
+test_expect_success 'test-tool env-helper --type=bool' '
 	# Test various --default bool values
 	echo true >expected &&
-	git env--helper --type=bool --default=1 MISSING >actual &&
+	test-tool env-helper --type=bool --default=1 MISSING >actual &&
 	test_cmp expected actual &&
-	git env--helper --type=bool --default=yes MISSING >actual &&
+	test-tool env-helper --type=bool --default=yes MISSING >actual &&
 	test_cmp expected actual &&
-	git env--helper --type=bool --default=true MISSING >actual &&
+	test-tool env-helper --type=bool --default=true MISSING >actual &&
 	test_cmp expected actual &&
 	echo false >expected &&
-	test_must_fail git env--helper --type=bool --default=0 MISSING >actual &&
+	test_must_fail test-tool env-helper --type=bool --default=0 MISSING >actual &&
 	test_cmp expected actual &&
-	test_must_fail git env--helper --type=bool --default=no MISSING >actual &&
+	test_must_fail test-tool env-helper --type=bool --default=no MISSING >actual &&
 	test_cmp expected actual &&
-	test_must_fail git env--helper --type=bool --default=false MISSING >actual &&
+	test_must_fail test-tool env-helper --type=bool --default=false MISSING >actual &&
 	test_cmp expected actual &&
 
 	# No output with --exit-code
-	git env--helper --type=bool --default=true --exit-code MISSING >actual.out 2>actual.err &&
+	test-tool env-helper --type=bool --default=true --exit-code MISSING >actual.out 2>actual.err &&
 	test_must_be_empty actual.out &&
 	test_must_be_empty actual.err &&
-	test_must_fail git env--helper --type=bool --default=false --exit-code MISSING >actual.out 2>actual.err &&
+	test_must_fail test-tool env-helper --type=bool --default=false --exit-code MISSING >actual.out 2>actual.err &&
 	test_must_be_empty actual.out &&
 	test_must_be_empty actual.err &&
 
 	# Existing variable
-	EXISTS=true git env--helper --type=bool --default=false --exit-code EXISTS >actual.out 2>actual.err &&
+	EXISTS=true test-tool env-helper --type=bool --default=false --exit-code EXISTS >actual.out 2>actual.err &&
 	test_must_be_empty actual.out &&
 	test_must_be_empty actual.err &&
 	test_must_fail \
 		env EXISTS=false \
-		git env--helper --type=bool --default=true --exit-code EXISTS >actual.out 2>actual.err &&
+		test-tool env-helper --type=bool --default=true --exit-code EXISTS >actual.out 2>actual.err &&
 	test_must_be_empty actual.out &&
 	test_must_be_empty actual.err
 '
 
-test_expect_success 'env--helper --type=ulong' '
+test_expect_success 'test-tool env-helper --type=ulong' '
 	echo 1234567890 >expected &&
-	git env--helper --type=ulong --default=1234567890 MISSING >actual.out 2>actual.err &&
+	test-tool env-helper --type=ulong --default=1234567890 MISSING >actual.out 2>actual.err &&
 	test_cmp expected actual.out &&
 	test_must_be_empty actual.err &&
 
 	echo 0 >expected &&
-	test_must_fail git env--helper --type=ulong --default=0 MISSING >actual &&
+	test_must_fail test-tool env-helper --type=ulong --default=0 MISSING >actual &&
 	test_cmp expected actual &&
 
-	git env--helper --type=ulong --default=1234567890 --exit-code MISSING >actual.out 2>actual.err &&
+	test-tool env-helper --type=ulong --default=1234567890 --exit-code MISSING >actual.out 2>actual.err &&
 	test_must_be_empty actual.out &&
 	test_must_be_empty actual.err &&
 
-	EXISTS=1234567890 git env--helper --type=ulong --default=0 EXISTS --exit-code >actual.out 2>actual.err &&
+	EXISTS=1234567890 test-tool env-helper --type=ulong --default=0 EXISTS --exit-code >actual.out 2>actual.err &&
 	test_must_be_empty actual.out &&
 	test_must_be_empty actual.err &&
 
 	echo 1234567890 >expected &&
-	EXISTS=1234567890 git env--helper --type=ulong --default=0 EXISTS >actual.out 2>actual.err &&
+	EXISTS=1234567890 test-tool env-helper --type=ulong --default=0 EXISTS >actual.out 2>actual.err &&
 	test_cmp expected actual.out &&
 	test_must_be_empty actual.err
 '
 
-test_expect_success 'env--helper reads config thanks to trace2' '
+test_expect_success 'test-tool env-helper reads config thanks to trace2' '
 	mkdir home &&
 	git config -f home/.gitconfig include.path cycle &&
 	git config -f home/cycle include.path .gitconfig &&
 
 	test_must_fail \
-		env HOME="$(pwd)/home" GIT_TEST_GETTEXT_POISON=false \
+		env HOME="$(pwd)/home" \
 		git config -l 2>err &&
 	grep "exceeded maximum include depth" err &&
 
 	test_must_fail \
-		env HOME="$(pwd)/home" GIT_TEST_GETTEXT_POISON=true \
-		git -C cycle env--helper --type=bool --default=0 --exit-code GIT_TEST_GETTEXT_POISON 2>err &&
-	grep "# GETTEXT POISON #" err
+		env HOME="$(pwd)/home" GIT_TEST_ENV_HELPER=true \
+		test-tool -C cycle env-helper --type=bool --default=0 --exit-code GIT_TEST_ENV_HELPER 2>err &&
+	grep "exceeded maximum include depth" err
 '
 
 test_done
diff --git a/t/t0018-advice.sh b/t/t0018-advice.sh
index e03554d..0dcfb76 100755
--- a/t/t0018-advice.sh
+++ b/t/t0018-advice.sh
@@ -2,6 +2,7 @@
 
 test_description='Test advise_if_enabled functionality'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'advice should be printed when config variable is unset' '
@@ -10,17 +11,16 @@ test_expect_success 'advice should be printed when config variable is unset' '
 	hint: Disable this message with "git config advice.nestedTag false"
 	EOF
 	test-tool advise "This is a piece of advice" 2>actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 test_expect_success 'advice should be printed when config variable is set to true' '
 	cat >expect <<-\EOF &&
 	hint: This is a piece of advice
-	hint: Disable this message with "git config advice.nestedTag false"
 	EOF
 	test_config advice.nestedTag true &&
 	test-tool advise "This is a piece of advice" 2>actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 test_expect_success 'advice should not be printed when config variable is set to false' '
diff --git a/t/t0019-json-writer.sh b/t/t0019-json-writer.sh
index 3b0c336..19a730c 100755
--- a/t/t0019-json-writer.sh
+++ b/t/t0019-json-writer.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='test json-writer JSON generation'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'unit test of json-writer routines' '
diff --git a/t/t0020-crlf.sh b/t/t0020-crlf.sh
index b63ba62..81946e8 100755
--- a/t/t0020-crlf.sh
+++ b/t/t0020-crlf.sh
@@ -2,6 +2,10 @@
 
 test_description='CRLF conversion'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 has_cr() {
@@ -19,10 +23,10 @@ test_expect_success setup '
 
 	git config core.autocrlf false &&
 
-	for w in Hello world how are you; do echo $w; done >one &&
+	test_write_lines Hello world how are you >one &&
 	mkdir dir &&
-	for w in I am very very fine thank you; do echo $w; done >dir/two &&
-	for w in Oh here is NULQin text here; do echo $w; done | q_to_nul >three &&
+	test_write_lines I am very very fine thank you >dir/two &&
+	test_write_lines Oh here is NULQin text here | q_to_nul >three &&
 	git add . &&
 
 	git commit -m initial &&
@@ -32,7 +36,7 @@ test_expect_success setup '
 	two=$(git rev-parse HEAD:dir/two) &&
 	three=$(git rev-parse HEAD:three) &&
 
-	for w in Some extra lines here; do echo $w; done >>one &&
+	test_write_lines Some extra lines here >>one &&
 	git diff >patch.file &&
 	patched=$(git hash-object --stdin <one) &&
 	git read-tree --reset -u HEAD
@@ -43,7 +47,7 @@ test_expect_success 'safecrlf: autocrlf=input, all CRLF' '
 	git config core.autocrlf input &&
 	git config core.safecrlf true &&
 
-	for w in I am all CRLF; do echo $w; done | append_cr >allcrlf &&
+	test_write_lines I am all CRLF | append_cr >allcrlf &&
 	test_must_fail git add allcrlf
 '
 
@@ -52,7 +56,7 @@ test_expect_success 'safecrlf: autocrlf=input, mixed LF/CRLF' '
 	git config core.autocrlf input &&
 	git config core.safecrlf true &&
 
-	for w in Oh here is CRLFQ in text; do echo $w; done | q_to_cr >mixed &&
+	test_write_lines Oh here is CRLFQ in text | q_to_cr >mixed &&
 	test_must_fail git add mixed
 '
 
@@ -61,7 +65,7 @@ test_expect_success 'safecrlf: autocrlf=true, all LF' '
 	git config core.autocrlf true &&
 	git config core.safecrlf true &&
 
-	for w in I am all LF; do echo $w; done >alllf &&
+	test_write_lines I am all LF >alllf &&
 	test_must_fail git add alllf
 '
 
@@ -70,7 +74,7 @@ test_expect_success 'safecrlf: autocrlf=true mixed LF/CRLF' '
 	git config core.autocrlf true &&
 	git config core.safecrlf true &&
 
-	for w in Oh here is CRLFQ in text; do echo $w; done | q_to_cr >mixed &&
+	test_write_lines Oh here is CRLFQ in text | q_to_cr >mixed &&
 	test_must_fail git add mixed
 '
 
@@ -79,15 +83,13 @@ test_expect_success 'safecrlf: print warning only once' '
 	git config core.autocrlf input &&
 	git config core.safecrlf warn &&
 
-	for w in I am all LF; do echo $w; done >doublewarn &&
+	test_write_lines I am all LF >doublewarn &&
 	git add doublewarn &&
 	git commit -m "nowarn" &&
-	for w in Oh here is CRLFQ in text; do echo $w; done | q_to_cr >doublewarn &&
+	test_write_lines Oh here is CRLFQ in text | q_to_cr >doublewarn &&
 	git add doublewarn 2>err &&
-	if test_have_prereq C_LOCALE_OUTPUT
-	then
-		test $(grep "CRLF will be replaced by LF" err | wc -l) = 1
-	fi
+	grep "CRLF will be replaced by LF" err >err.warnings &&
+	test_line_count = 1 err.warnings
 '
 
 
@@ -102,7 +104,7 @@ test_expect_success 'safecrlf: no warning with safecrlf=false' '
 	git config core.autocrlf input &&
 	git config core.safecrlf false &&
 
-	for w in I am all CRLF; do echo $w; done | append_cr >allcrlf &&
+	test_write_lines I am all CRLF | append_cr >allcrlf &&
 	git add allcrlf 2>err &&
 	test_must_be_empty err
 '
@@ -123,7 +125,7 @@ test_expect_success 'update with autocrlf=input' '
 	munge_cr append dir/two &&
 	git update-index -- one dir/two &&
 	differs=$(git diff-index --cached HEAD) &&
-	verbose test -z "$differs"
+	test -z "$differs"
 
 '
 
@@ -136,7 +138,7 @@ test_expect_success 'update with autocrlf=true' '
 	munge_cr append dir/two &&
 	git update-index -- one dir/two &&
 	differs=$(git diff-index --cached HEAD) &&
-	verbose test -z "$differs"
+	test -z "$differs"
 
 '
 
@@ -151,7 +153,7 @@ test_expect_success 'checkout with autocrlf=true' '
 	test "$one" = $(git hash-object --stdin <one) &&
 	test "$two" = $(git hash-object --stdin <dir/two) &&
 	differs=$(git diff-index --cached HEAD) &&
-	verbose test -z "$differs"
+	test -z "$differs"
 '
 
 test_expect_success 'checkout with autocrlf=input' '
@@ -165,7 +167,7 @@ test_expect_success 'checkout with autocrlf=input' '
 	test "$one" = $(git hash-object --stdin <one) &&
 	test "$two" = $(git hash-object --stdin <dir/two) &&
 	differs=$(git diff-index --cached HEAD) &&
-	verbose test -z "$differs"
+	test -z "$differs"
 '
 
 test_expect_success 'apply patch (autocrlf=input)' '
@@ -175,7 +177,7 @@ test_expect_success 'apply patch (autocrlf=input)' '
 	git read-tree --reset -u HEAD &&
 
 	git apply patch.file &&
-	verbose test "$patched" = "$(git hash-object --stdin <one)"
+	test "$patched" = "$(git hash-object --stdin <one)"
 '
 
 test_expect_success 'apply patch --cached (autocrlf=input)' '
@@ -185,7 +187,7 @@ test_expect_success 'apply patch --cached (autocrlf=input)' '
 	git read-tree --reset -u HEAD &&
 
 	git apply --cached patch.file &&
-	verbose test "$patched" = $(git rev-parse :one)
+	test "$patched" = $(git rev-parse :one)
 '
 
 test_expect_success 'apply patch --index (autocrlf=input)' '
@@ -195,8 +197,8 @@ test_expect_success 'apply patch --index (autocrlf=input)' '
 	git read-tree --reset -u HEAD &&
 
 	git apply --index patch.file &&
-	verbose test "$patched" = $(git rev-parse :one) &&
-	verbose test "$patched" = $(git hash-object --stdin <one)
+	test "$patched" = $(git rev-parse :one) &&
+	test "$patched" = $(git hash-object --stdin <one)
 '
 
 test_expect_success 'apply patch (autocrlf=true)' '
@@ -206,7 +208,7 @@ test_expect_success 'apply patch (autocrlf=true)' '
 	git read-tree --reset -u HEAD &&
 
 	git apply patch.file &&
-	verbose test "$patched" = "$(remove_cr <one | git hash-object --stdin)"
+	test "$patched" = "$(remove_cr <one | git hash-object --stdin)"
 '
 
 test_expect_success 'apply patch --cached (autocrlf=true)' '
@@ -216,7 +218,7 @@ test_expect_success 'apply patch --cached (autocrlf=true)' '
 	git read-tree --reset -u HEAD &&
 
 	git apply --cached patch.file &&
-	verbose test "$patched" = $(git rev-parse :one)
+	test "$patched" = $(git rev-parse :one)
 '
 
 test_expect_success 'apply patch --index (autocrlf=true)' '
@@ -226,8 +228,8 @@ test_expect_success 'apply patch --index (autocrlf=true)' '
 	git read-tree --reset -u HEAD &&
 
 	git apply --index patch.file &&
-	verbose test "$patched" = $(git rev-parse :one) &&
-	verbose test "$patched" = "$(remove_cr <one | git hash-object --stdin)"
+	test "$patched" = $(git rev-parse :one) &&
+	test "$patched" = "$(remove_cr <one | git hash-object --stdin)"
 '
 
 test_expect_success '.gitattributes says two is binary' '
@@ -238,7 +240,7 @@ test_expect_success '.gitattributes says two is binary' '
 	git read-tree --reset -u HEAD &&
 
 	! has_cr dir/two &&
-	verbose has_cr one &&
+	has_cr one &&
 	! has_cr three
 '
 
@@ -257,8 +259,8 @@ test_expect_success '.gitattributes says two and three are text' '
 	echo "t* crlf" >.gitattributes &&
 	git read-tree --reset -u HEAD &&
 
-	verbose has_cr dir/two &&
-	verbose has_cr three
+	has_cr dir/two &&
+	has_cr three
 '
 
 test_expect_success 'in-tree .gitattributes (1)' '
@@ -271,7 +273,7 @@ test_expect_success 'in-tree .gitattributes (1)' '
 	git read-tree --reset -u HEAD &&
 
 	! has_cr one &&
-	verbose has_cr three
+	has_cr three
 '
 
 test_expect_success 'in-tree .gitattributes (2)' '
@@ -281,7 +283,7 @@ test_expect_success 'in-tree .gitattributes (2)' '
 	git checkout-index -f -q -u -a &&
 
 	! has_cr one &&
-	verbose has_cr three
+	has_cr three
 '
 
 test_expect_success 'in-tree .gitattributes (3)' '
@@ -292,7 +294,7 @@ test_expect_success 'in-tree .gitattributes (3)' '
 	git checkout-index -u one dir/two three &&
 
 	! has_cr one &&
-	verbose has_cr three
+	has_cr three
 '
 
 test_expect_success 'in-tree .gitattributes (4)' '
@@ -303,7 +305,7 @@ test_expect_success 'in-tree .gitattributes (4)' '
 	git checkout-index -u .gitattributes &&
 
 	! has_cr one &&
-	verbose has_cr three
+	has_cr three
 '
 
 test_expect_success 'checkout with existing .gitattributes' '
@@ -318,8 +320,8 @@ test_expect_success 'checkout with existing .gitattributes' '
 	git add .gitattributes .file &&
 	git commit -m second &&
 
-	git checkout master~1 &&
-	git checkout master &&
+	git checkout main~1 &&
+	git checkout main &&
 	test "$(git diff-files --raw)" = ""
 
 '
@@ -331,8 +333,8 @@ test_expect_success 'checkout when deleting .gitattributes' '
 	git add .file2 &&
 	git commit -m third &&
 
-	git checkout master~1 &&
-	git checkout master &&
+	git checkout main~1 &&
+	git checkout main &&
 	has_cr .file2
 
 '
@@ -350,9 +352,9 @@ test_expect_success 'setting up for new autocrlf tests' '
 	git config core.autocrlf false &&
 	git config core.safecrlf false &&
 	rm -rf .????* * &&
-	for w in I am all LF; do echo $w; done >alllf &&
-	for w in Oh here is CRLFQ in text; do echo $w; done | q_to_cr >mixed &&
-	for w in I am all CRLF; do echo $w; done | append_cr >allcrlf &&
+	test_write_lines I am all LF >alllf &&
+	test_write_lines Oh here is CRLFQ in text | q_to_cr >mixed &&
+	test_write_lines I am all CRLF | append_cr >allcrlf &&
 	git add -A . &&
 	git commit -m "alllf, allcrlf and mixed only" &&
 	git tag -a -m "message" autocrlf-checkpoint
diff --git a/t/t0021-conversion.sh b/t/t0021-conversion.sh
index 4bfffa9..0b49970 100755
--- a/t/t0021-conversion.sh
+++ b/t/t0021-conversion.sh
@@ -2,10 +2,14 @@
 
 test_description='blob conversion via gitattributes'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-terminal.sh
 
-TEST_ROOT="$PWD"
-PATH=$TEST_ROOT:$PATH
+PATH=$PWD:$PATH
+TEST_ROOT="$(pwd)"
 
 write_script <<\EOF "$TEST_ROOT/rot13.sh"
 tr \
@@ -13,9 +17,6 @@ tr \
   'nopqrstuvwxyzabcdefghijklmNOPQRSTUVWXYZABCDEFGHIJKLM'
 EOF
 
-write_script rot13-filter.pl "$PERL_PATH" \
-	<"$TEST_DIRECTORY"/t0021/rot13-filter.pl
-
 generate_random_characters () {
 	LEN=$1
 	NAME=$2
@@ -23,10 +24,6 @@ generate_random_characters () {
 		perl -pe "s/./chr((ord($&) % 26) + ord('a'))/sge" >"$TEST_ROOT/$NAME"
 }
 
-file_size () {
-	test-tool path-utils file-size "$1"
-}
-
 filter_git () {
 	rm -f *.log &&
 	git "$@"
@@ -35,7 +32,7 @@ filter_git () {
 # Compare two files and ensure that `clean` and `smudge` respectively are
 # called at least once if specified in the `expect` file. The actual
 # invocation count is not relevant because their number can vary.
-# c.f. http://lore.kernel.org/git/xmqqshv18i8i.fsf@gitster.mtv.corp.google.com/
+# c.f. https://lore.kernel.org/git/xmqqshv18i8i.fsf@gitster.mtv.corp.google.com/
 test_cmp_count () {
 	expect=$1
 	actual=$2
@@ -50,7 +47,7 @@ test_cmp_count () {
 
 # Compare two files but exclude all `clean` invocations because Git can
 # call `clean` zero or more times.
-# c.f. http://lore.kernel.org/git/xmqqshv18i8i.fsf@gitster.mtv.corp.google.com/
+# c.f. https://lore.kernel.org/git/xmqqshv18i8i.fsf@gitster.mtv.corp.google.com/
 test_cmp_exclude_clean () {
 	expect=$1
 	actual=$2
@@ -76,13 +73,13 @@ test_expect_success setup '
 	git config filter.rot13.clean ./rot13.sh &&
 
 	{
-	    echo "*.t filter=rot13"
+	    echo "*.t filter=rot13" &&
 	    echo "*.i ident"
 	} >.gitattributes &&
 
 	{
-	    echo a b c d e f g h i j k l m
-	    echo n o p q r s t u v w x y z
+	    echo a b c d e f g h i j k l m &&
+	    echo n o p q r s t u v w x y z &&
 	    echo '\''$Id$'\''
 	} >test &&
 	cat test >test.t &&
@@ -118,17 +115,17 @@ test_expect_success check '
 # If an expanded ident ever gets into the repository, we want to make sure that
 # it is collapsed before being expanded again on checkout
 test_expect_success expanded_in_repo '
-	{
-		echo "File with expanded keywords"
-		echo "\$Id\$"
-		echo "\$Id:\$"
-		echo "\$Id: 0000000000000000000000000000000000000000 \$"
-		echo "\$Id: NoSpaceAtEnd\$"
-		echo "\$Id:NoSpaceAtFront \$"
-		echo "\$Id:NoSpaceAtEitherEnd\$"
-		echo "\$Id: NoTerminatingSymbol"
-		echo "\$Id: Foreign Commit With Spaces \$"
-	} >expanded-keywords.0 &&
+	cat >expanded-keywords.0 <<-\EOF &&
+	File with expanded keywords
+	$Id$
+	$Id:$
+	$Id: 0000000000000000000000000000000000000000 $
+	$Id: NoSpaceAtEnd$
+	$Id:NoSpaceAtFront $
+	$Id:NoSpaceAtEitherEnd$
+	$Id: NoTerminatingSymbol
+	$Id: Foreign Commit With Spaces $
+	EOF
 
 	{
 		cat expanded-keywords.0 &&
@@ -139,17 +136,17 @@ test_expect_success expanded_in_repo '
 	git commit -m "File with keywords expanded" &&
 	id=$(git rev-parse --verify :expanded-keywords) &&
 
-	{
-		echo "File with expanded keywords"
-		echo "\$Id: $id \$"
-		echo "\$Id: $id \$"
-		echo "\$Id: $id \$"
-		echo "\$Id: $id \$"
-		echo "\$Id: $id \$"
-		echo "\$Id: $id \$"
-		echo "\$Id: NoTerminatingSymbol"
-		echo "\$Id: Foreign Commit With Spaces \$"
-	} >expected-output.0 &&
+	cat >expected-output.0 <<-EOF &&
+	File with expanded keywords
+	\$Id: $id \$
+	\$Id: $id \$
+	\$Id: $id \$
+	\$Id: $id \$
+	\$Id: $id \$
+	\$Id: $id \$
+	\$Id: NoTerminatingSymbol
+	\$Id: Foreign Commit With Spaces \$
+	EOF
 	{
 		cat expected-output.0 &&
 		printf "\$Id: NoTerminatingSymbolAtEOF"
@@ -159,7 +156,7 @@ test_expect_success expanded_in_repo '
 		printf "\$Id: NoTerminatingSymbolAtEOF"
 	} >expected-output-crlf &&
 	{
-		echo "expanded-keywords ident"
+		echo "expanded-keywords ident" &&
 		echo "expanded-keywords-crlf ident text eol=crlf"
 	} >>.gitattributes &&
 
@@ -258,10 +255,34 @@ test_expect_success 'required filter clean failure' '
 	test_must_fail git add test.fc
 '
 
+test_expect_success 'required filter with absent clean field' '
+	test_config filter.absentclean.smudge cat &&
+	test_config filter.absentclean.required true &&
+
+	echo "*.ac filter=absentclean" >.gitattributes &&
+
+	echo test >test.ac &&
+	test_must_fail git add test.ac 2>stderr &&
+	test_grep "fatal: test.ac: clean filter .absentclean. failed" stderr
+'
+
+test_expect_success 'required filter with absent smudge field' '
+	test_config filter.absentsmudge.clean cat &&
+	test_config filter.absentsmudge.required true &&
+
+	echo "*.as filter=absentsmudge" >.gitattributes &&
+
+	echo test >test.as &&
+	git add test.as &&
+	rm -f test.as &&
+	test_must_fail git checkout -- test.as 2>stderr &&
+	test_grep "fatal: test.as: smudge filter absentsmudge failed" stderr
+'
+
 test_expect_success 'filtering large input to small output should use little memory' '
 	test_config filter.devnull.clean "cat >/dev/null" &&
 	test_config filter.devnull.required true &&
-	for i in $(test_seq 1 30); do printf "%1048576d" 1; done >30MB &&
+	for i in $(test_seq 1 30); do printf "%1048576d" 1 || return 1; done >30MB &&
 	echo "30MB filter=devnull" >.gitattributes &&
 	GIT_MMAP_LIMIT=1m GIT_ALLOC_LIMIT=1m git add 30MB
 '
@@ -279,7 +300,7 @@ test_expect_success 'filter that does not read is fine' '
 test_expect_success EXPENSIVE 'filter large file' '
 	test_config filter.largefile.smudge cat &&
 	test_config filter.largefile.clean cat &&
-	for i in $(test_seq 1 2048); do printf "%1048576d" 1; done >2GB &&
+	for i in $(test_seq 1 2048); do printf "%1048576d" 1 || return 1; done >2GB &&
 	echo "2GB filter=largefile" >.gitattributes &&
 	git add 2GB 2>err &&
 	test_must_be_empty err &&
@@ -341,8 +362,8 @@ test_expect_success 'diff does not reuse worktree files that need cleaning' '
 	test_line_count = 0 count
 '
 
-test_expect_success PERL 'required process filter should filter data' '
-	test_config_global filter.protocol.process "rot13-filter.pl debug.log clean smudge" &&
+test_expect_success 'required process filter should filter data' '
+	test_config_global filter.protocol.process "test-tool rot13-filter --log=debug.log clean smudge" &&
 	test_config_global filter.protocol.required true &&
 	rm -rf repo &&
 	mkdir repo &&
@@ -361,9 +382,9 @@ test_expect_success PERL 'required process filter should filter data' '
 		cp "$TEST_ROOT/test3 '\''sq'\'',\$x=.o" "testsubdir/test3 '\''sq'\'',\$x=.r" &&
 		>test4-empty.r &&
 
-		S=$(file_size test.r) &&
-		S2=$(file_size test2.r) &&
-		S3=$(file_size "testsubdir/test3 '\''sq'\'',\$x=.r") &&
+		S=$(test_file_size test.r) &&
+		S2=$(test_file_size test2.r) &&
+		S3=$(test_file_size "testsubdir/test3 '\''sq'\'',\$x=.r") &&
 		M=$(git hash-object test.r) &&
 		M2=$(git hash-object test2.r) &&
 		M3=$(git hash-object "testsubdir/test3 '\''sq'\'',\$x=.r") &&
@@ -382,8 +403,8 @@ test_expect_success PERL 'required process filter should filter data' '
 		test_cmp_count expected.log debug.log &&
 
 		git commit -m "test commit 2" &&
-		MASTER=$(git rev-parse --verify master) &&
-		META="ref=refs/heads/master treeish=$MASTER" &&
+		MAIN=$(git rev-parse --verify main) &&
+		META="ref=refs/heads/main treeish=$MAIN" &&
 		rm -f test2.r "testsubdir/test3 '\''sq'\'',\$x=.r" &&
 
 		filter_git checkout --quiet --no-progress . &&
@@ -408,7 +429,7 @@ test_expect_success PERL 'required process filter should filter data' '
 		EOF
 		test_cmp_exclude_clean expected.log debug.log &&
 
-		filter_git checkout --quiet --no-progress master &&
+		filter_git checkout --quiet --no-progress main &&
 		cat >expected.log <<-EOF &&
 			START
 			init handshake complete
@@ -426,29 +447,29 @@ test_expect_success PERL 'required process filter should filter data' '
 	)
 '
 
-test_expect_success PERL 'required process filter should filter data for various subcommands' '
-	test_config_global filter.protocol.process "rot13-filter.pl debug.log clean smudge" &&
+test_expect_success 'required process filter should filter data for various subcommands' '
+	test_config_global filter.protocol.process "test-tool rot13-filter --log=debug.log clean smudge" &&
 	test_config_global filter.protocol.required true &&
 	(
 		cd repo &&
 
-		S=$(file_size test.r) &&
-		S2=$(file_size test2.r) &&
-		S3=$(file_size "testsubdir/test3 '\''sq'\'',\$x=.r") &&
+		S=$(test_file_size test.r) &&
+		S2=$(test_file_size test2.r) &&
+		S3=$(test_file_size "testsubdir/test3 '\''sq'\'',\$x=.r") &&
 		M=$(git hash-object test.r) &&
 		M2=$(git hash-object test2.r) &&
 		M3=$(git hash-object "testsubdir/test3 '\''sq'\'',\$x=.r") &&
 		EMPTY=$(git hash-object /dev/null) &&
 
-		MASTER=$(git rev-parse --verify master) &&
+		MAIN=$(git rev-parse --verify main) &&
 
 		cp "$TEST_ROOT/test.o" test5.r &&
 		git add test5.r &&
 		git commit -m "test commit 3" &&
 		git checkout empty-branch &&
-		filter_git rebase --onto empty-branch master^^ master &&
-		MASTER2=$(git rev-parse --verify master) &&
-		META="ref=refs/heads/master treeish=$MASTER2" &&
+		filter_git rebase --onto empty-branch main^^ main &&
+		MAIN2=$(git rev-parse --verify main) &&
+		META="ref=refs/heads/main treeish=$MAIN2" &&
 		cat >expected.log <<-EOF &&
 			START
 			init handshake complete
@@ -462,8 +483,8 @@ test_expect_success PERL 'required process filter should filter data for various
 		test_cmp_exclude_clean expected.log debug.log &&
 
 		git reset --hard empty-branch &&
-		filter_git reset --hard $MASTER &&
-		META="treeish=$MASTER" &&
+		filter_git reset --hard $MAIN &&
+		META="treeish=$MAIN" &&
 		cat >expected.log <<-EOF &&
 			START
 			init handshake complete
@@ -475,10 +496,10 @@ test_expect_success PERL 'required process filter should filter data for various
 		EOF
 		test_cmp_exclude_clean expected.log debug.log &&
 
-		git branch old-master $MASTER &&
+		git branch old-main $MAIN &&
 		git reset --hard empty-branch &&
-		filter_git reset --hard old-master &&
-		META="ref=refs/heads/old-master treeish=$MASTER" &&
+		filter_git reset --hard old-main &&
+		META="ref=refs/heads/old-main treeish=$MAIN" &&
 		cat >expected.log <<-EOF &&
 			START
 			init handshake complete
@@ -491,9 +512,9 @@ test_expect_success PERL 'required process filter should filter data for various
 		test_cmp_exclude_clean expected.log debug.log &&
 
 		git checkout -b merge empty-branch &&
-		git branch -f master $MASTER2 &&
-		filter_git merge master &&
-		META="treeish=$MASTER2" &&
+		git branch -f main $MAIN2 &&
+		filter_git merge main &&
+		META="treeish=$MAIN2" &&
 		cat >expected.log <<-EOF &&
 			START
 			init handshake complete
@@ -506,8 +527,8 @@ test_expect_success PERL 'required process filter should filter data for various
 		EOF
 		test_cmp_exclude_clean expected.log debug.log &&
 
-		filter_git archive master >/dev/null &&
-		META="ref=refs/heads/master treeish=$MASTER2" &&
+		filter_git archive main >/dev/null &&
+		META="ref=refs/heads/main treeish=$MAIN2" &&
 		cat >expected.log <<-EOF &&
 			START
 			init handshake complete
@@ -520,7 +541,7 @@ test_expect_success PERL 'required process filter should filter data for various
 		EOF
 		test_cmp_exclude_clean expected.log debug.log &&
 
-		TREE="$(git rev-parse $MASTER2^{tree})" &&
+		TREE="$(git rev-parse $MAIN2^{tree})" &&
 		filter_git archive $TREE >/dev/null &&
 		META="treeish=$TREE" &&
 		cat >expected.log <<-EOF &&
@@ -537,9 +558,9 @@ test_expect_success PERL 'required process filter should filter data for various
 	)
 '
 
-test_expect_success PERL 'required process filter takes precedence' '
+test_expect_success 'required process filter takes precedence' '
 	test_config_global filter.protocol.clean false &&
-	test_config_global filter.protocol.process "rot13-filter.pl debug.log clean" &&
+	test_config_global filter.protocol.process "test-tool rot13-filter --log=debug.log clean" &&
 	test_config_global filter.protocol.required true &&
 	rm -rf repo &&
 	mkdir repo &&
@@ -549,7 +570,7 @@ test_expect_success PERL 'required process filter takes precedence' '
 
 		echo "*.r filter=protocol" >.gitattributes &&
 		cp "$TEST_ROOT/test.o" test.r &&
-		S=$(file_size test.r) &&
+		S=$(test_file_size test.r) &&
 
 		# Check that the process filter is invoked here
 		filter_git add . &&
@@ -563,8 +584,8 @@ test_expect_success PERL 'required process filter takes precedence' '
 	)
 '
 
-test_expect_success PERL 'required process filter should be used only for "clean" operation only' '
-	test_config_global filter.protocol.process "rot13-filter.pl debug.log clean" &&
+test_expect_success 'required process filter should be used only for "clean" operation only' '
+	test_config_global filter.protocol.process "test-tool rot13-filter --log=debug.log clean" &&
 	rm -rf repo &&
 	mkdir repo &&
 	(
@@ -573,7 +594,7 @@ test_expect_success PERL 'required process filter should be used only for "clean
 
 		echo "*.r filter=protocol" >.gitattributes &&
 		cp "$TEST_ROOT/test.o" test.r &&
-		S=$(file_size test.r) &&
+		S=$(test_file_size test.r) &&
 
 		filter_git add . &&
 		cat >expected.log <<-EOF &&
@@ -598,8 +619,8 @@ test_expect_success PERL 'required process filter should be used only for "clean
 	)
 '
 
-test_expect_success PERL 'required process filter should process multiple packets' '
-	test_config_global filter.protocol.process "rot13-filter.pl debug.log clean smudge" &&
+test_expect_success 'required process filter should process multiple packets' '
+	test_config_global filter.protocol.process "test-tool rot13-filter --log=debug.log clean smudge" &&
 	test_config_global filter.protocol.required true &&
 
 	rm -rf repo &&
@@ -619,7 +640,7 @@ test_expect_success PERL 'required process filter should process multiple packet
 		for FILE in "$TEST_ROOT"/*.file
 		do
 			cp "$FILE" . &&
-			rot13.sh <"$FILE" >"$FILE.rot13"
+			rot13.sh <"$FILE" >"$FILE.rot13" || return 1
 		done &&
 
 		echo "*.file filter=protocol" >.gitattributes &&
@@ -658,13 +679,13 @@ test_expect_success PERL 'required process filter should process multiple packet
 
 		for FILE in *.file
 		do
-			test_cmp_committed_rot13 "$TEST_ROOT/$FILE" $FILE
+			test_cmp_committed_rot13 "$TEST_ROOT/$FILE" $FILE || return 1
 		done
 	)
 '
 
-test_expect_success PERL 'required process filter with clean error should fail' '
-	test_config_global filter.protocol.process "rot13-filter.pl debug.log clean smudge" &&
+test_expect_success 'required process filter with clean error should fail' '
+	test_config_global filter.protocol.process "test-tool rot13-filter --log=debug.log clean smudge" &&
 	test_config_global filter.protocol.required true &&
 	rm -rf repo &&
 	mkdir repo &&
@@ -682,8 +703,8 @@ test_expect_success PERL 'required process filter with clean error should fail'
 	)
 '
 
-test_expect_success PERL 'process filter should restart after unexpected write failure' '
-	test_config_global filter.protocol.process "rot13-filter.pl debug.log clean smudge" &&
+test_expect_success 'process filter should restart after unexpected write failure' '
+	test_config_global filter.protocol.process "test-tool rot13-filter --log=debug.log clean smudge" &&
 	rm -rf repo &&
 	mkdir repo &&
 	(
@@ -697,9 +718,9 @@ test_expect_success PERL 'process filter should restart after unexpected write f
 		echo "this is going to fail" >smudge-write-fail.o &&
 		cp smudge-write-fail.o smudge-write-fail.r &&
 
-		S=$(file_size test.r) &&
-		S2=$(file_size test2.r) &&
-		SF=$(file_size smudge-write-fail.r) &&
+		S=$(test_file_size test.r) &&
+		S2=$(test_file_size test2.r) &&
+		SF=$(test_file_size smudge-write-fail.r) &&
 		M=$(git hash-object test.r) &&
 		M2=$(git hash-object test2.r) &&
 		MF=$(git hash-object smudge-write-fail.r) &&
@@ -711,8 +732,8 @@ test_expect_success PERL 'process filter should restart after unexpected write f
 		rm -f debug.log &&
 		git checkout --quiet --no-progress . 2>git-stderr.log &&
 
-		grep "smudge write error at" git-stderr.log &&
-		test_i18ngrep "error: external filter" git-stderr.log &&
+		grep "smudge write error" git-stderr.log &&
+		test_grep "error: external filter" git-stderr.log &&
 
 		cat >expected.log <<-EOF &&
 			START
@@ -737,8 +758,8 @@ test_expect_success PERL 'process filter should restart after unexpected write f
 	)
 '
 
-test_expect_success PERL 'process filter should not be restarted if it signals an error' '
-	test_config_global filter.protocol.process "rot13-filter.pl debug.log clean smudge" &&
+test_expect_success 'process filter should not be restarted if it signals an error' '
+	test_config_global filter.protocol.process "test-tool rot13-filter --log=debug.log clean smudge" &&
 	rm -rf repo &&
 	mkdir repo &&
 	(
@@ -752,9 +773,9 @@ test_expect_success PERL 'process filter should not be restarted if it signals a
 		echo "this will cause an error" >error.o &&
 		cp error.o error.r &&
 
-		S=$(file_size test.r) &&
-		S2=$(file_size test2.r) &&
-		SE=$(file_size error.r) &&
+		S=$(test_file_size test.r) &&
+		S2=$(test_file_size test2.r) &&
+		SE=$(test_file_size error.r) &&
 		M=$(git hash-object test.r) &&
 		M2=$(git hash-object test2.r) &&
 		ME=$(git hash-object error.r) &&
@@ -780,8 +801,8 @@ test_expect_success PERL 'process filter should not be restarted if it signals a
 	)
 '
 
-test_expect_success PERL 'process filter abort stops processing of all further files' '
-	test_config_global filter.protocol.process "rot13-filter.pl debug.log clean smudge" &&
+test_expect_success 'process filter abort stops processing of all further files' '
+	test_config_global filter.protocol.process "test-tool rot13-filter --log=debug.log clean smudge" &&
 	rm -rf repo &&
 	mkdir repo &&
 	(
@@ -797,7 +818,7 @@ test_expect_success PERL 'process filter abort stops processing of all further f
 
 		M="blob=$(git hash-object abort.r)" &&
 		rm -f debug.log &&
-		SA=$(file_size abort.r) &&
+		SA=$(test_file_size abort.r) &&
 
 		git add . &&
 		rm -f *.r &&
@@ -837,10 +858,10 @@ test_expect_success PERL 'invalid process filter must fail (and not hang!)' '
 	)
 '
 
-test_expect_success PERL 'delayed checkout in process filter' '
-	test_config_global filter.a.process "rot13-filter.pl a.log clean smudge delay" &&
+test_expect_success 'delayed checkout in process filter' '
+	test_config_global filter.a.process "test-tool rot13-filter --log=a.log clean smudge delay" &&
 	test_config_global filter.a.required true &&
-	test_config_global filter.b.process "rot13-filter.pl b.log clean smudge delay" &&
+	test_config_global filter.b.process "test-tool rot13-filter --log=b.log clean smudge delay" &&
 	test_config_global filter.b.required true &&
 
 	rm -rf repo &&
@@ -859,9 +880,9 @@ test_expect_success PERL 'delayed checkout in process filter' '
 		git commit -m "test commit"
 	) &&
 
-	S=$(file_size "$TEST_ROOT/test.o") &&
-	PM="ref=refs/heads/master treeish=$(git -C repo rev-parse --verify master) " &&
-	M="${PM}blob=$(git -C repo rev-parse --verify master:test.a)" &&
+	S=$(test_file_size "$TEST_ROOT/test.o") &&
+	PM="ref=refs/heads/main treeish=$(git -C repo rev-parse --verify main) " &&
+	M="${PM}blob=$(git -C repo rev-parse --verify main:test.a)" &&
 	cat >a.exp <<-EOF &&
 		START
 		init handshake complete
@@ -916,8 +937,8 @@ test_expect_success PERL 'delayed checkout in process filter' '
 	)
 '
 
-test_expect_success PERL 'missing file in delayed checkout' '
-	test_config_global filter.bug.process "rot13-filter.pl bug.log clean smudge delay" &&
+test_expect_success 'missing file in delayed checkout' '
+	test_config_global filter.bug.process "test-tool rot13-filter --log=bug.log clean smudge delay" &&
 	test_config_global filter.bug.required true &&
 
 	rm -rf repo &&
@@ -936,8 +957,8 @@ test_expect_success PERL 'missing file in delayed checkout' '
 	grep "error: .missing-delay\.a. was not filtered properly" git-stderr.log
 '
 
-test_expect_success PERL 'invalid file in delayed checkout' '
-	test_config_global filter.bug.process "rot13-filter.pl bug.log clean smudge delay" &&
+test_expect_success 'invalid file in delayed checkout' '
+	test_config_global filter.bug.process "test-tool rot13-filter --log=bug.log clean smudge delay" &&
 	test_config_global filter.bug.required true &&
 
 	rm -rf repo &&
@@ -957,4 +978,177 @@ test_expect_success PERL 'invalid file in delayed checkout' '
 	grep "error: external filter .* signaled that .unfiltered. is now available although it has not been delayed earlier" git-stderr.log
 '
 
+for mode in 'case' 'utf-8'
+do
+	case "$mode" in
+	case)	dir='A' symlink='a' mode_prereq='CASE_INSENSITIVE_FS' ;;
+	utf-8)
+		dir=$(printf "\141\314\210") symlink=$(printf "\303\244")
+		mode_prereq='UTF8_NFD_TO_NFC' ;;
+	esac
+
+	test_expect_success SYMLINKS,$mode_prereq \
+	"delayed checkout with $mode-collision don't write to the wrong place" '
+		test_config_global filter.delay.process \
+			"test-tool rot13-filter --always-delay --log=delayed.log clean smudge delay" &&
+		test_config_global filter.delay.required true &&
+
+		git init $mode-collision &&
+		(
+			cd $mode-collision &&
+			mkdir target-dir &&
+
+			empty_oid=$(printf "" | git hash-object -w --stdin) &&
+			symlink_oid=$(printf "%s" "$PWD/target-dir" | git hash-object -w --stdin) &&
+			attr_oid=$(echo "$dir/z filter=delay" | git hash-object -w --stdin) &&
+
+			cat >objs <<-EOF &&
+			100644 blob $empty_oid	$dir/x
+			100644 blob $empty_oid	$dir/y
+			100644 blob $empty_oid	$dir/z
+			120000 blob $symlink_oid	$symlink
+			100644 blob $attr_oid	.gitattributes
+			EOF
+
+			git update-index --index-info <objs &&
+			git commit -m "test commit"
+		) &&
+
+		git clone $mode-collision $mode-collision-cloned &&
+		# Make sure z was really delayed
+		grep "IN: smudge $dir/z .* \\[DELAYED\\]" $mode-collision-cloned/delayed.log &&
+
+		# Should not create $dir/z at $symlink/z
+		test_path_is_missing $mode-collision/target-dir/z
+	'
+done
+
+test_expect_success SYMLINKS,CASE_INSENSITIVE_FS \
+"delayed checkout with submodule collision don't write to the wrong place" '
+	git init collision-with-submodule &&
+	(
+		cd collision-with-submodule &&
+		git config filter.delay.process "test-tool rot13-filter --always-delay --log=delayed.log clean smudge delay" &&
+		git config filter.delay.required true &&
+
+		# We need Git to treat the submodule "a" and the
+		# leading dir "A" as different paths in the index.
+		git config --local core.ignoreCase false &&
+
+		empty_oid=$(printf "" | git hash-object -w --stdin) &&
+		attr_oid=$(echo "A/B/y filter=delay" | git hash-object -w --stdin) &&
+		cat >objs <<-EOF &&
+		100644 blob $empty_oid	A/B/x
+		100644 blob $empty_oid	A/B/y
+		100644 blob $attr_oid	.gitattributes
+		EOF
+		git update-index --index-info <objs &&
+
+		git init a &&
+		mkdir target-dir &&
+		symlink_oid=$(printf "%s" "$PWD/target-dir" | git -C a hash-object -w --stdin) &&
+		echo "120000 blob $symlink_oid	b" >objs &&
+		git -C a update-index --index-info <objs &&
+		git -C a commit -m sub &&
+		git submodule add ./a &&
+		git commit -m super &&
+
+		git checkout --recurse-submodules . &&
+		grep "IN: smudge A/B/y .* \\[DELAYED\\]" delayed.log &&
+		test_path_is_missing target-dir/y
+	)
+'
+
+test_expect_success 'setup for progress tests' '
+	git init progress &&
+	(
+		cd progress &&
+		git config filter.delay.process "test-tool rot13-filter --log=delay-progress.log clean smudge delay" &&
+		git config filter.delay.required true &&
+
+		echo "*.a filter=delay" >.gitattributes &&
+		touch test-delay10.a &&
+		git add . &&
+		git commit -m files
+	)
+'
+
+test_delayed_checkout_progress () {
+	if test "$1" = "!"
+	then
+		local expect_progress=N &&
+		shift
+	else
+		local expect_progress=
+	fi &&
+
+	if test $# -lt 1
+	then
+		BUG "no command given to test_delayed_checkout_progress"
+	fi &&
+
+	(
+		cd progress &&
+		GIT_PROGRESS_DELAY=0 &&
+		export GIT_PROGRESS_DELAY &&
+		rm -f *.a delay-progress.log &&
+
+		"$@" 2>err &&
+		grep "IN: smudge test-delay10.a .* \\[DELAYED\\]" delay-progress.log &&
+		if test "$expect_progress" = N
+		then
+			! grep "Filtering content" err
+		else
+			grep "Filtering content" err
+		fi
+	)
+}
+
+for mode in pathspec branch
+do
+	case "$mode" in
+	pathspec) opt='.' ;;
+	branch) opt='-f HEAD' ;;
+	esac
+
+	test_expect_success PERL,TTY "delayed checkout shows progress by default on tty ($mode checkout)" '
+		test_delayed_checkout_progress test_terminal git checkout $opt
+	'
+
+	test_expect_success PERL "delayed checkout ommits progress on non-tty ($mode checkout)" '
+		test_delayed_checkout_progress ! git checkout $opt
+	'
+
+	test_expect_success PERL,TTY "delayed checkout ommits progress with --quiet ($mode checkout)" '
+		test_delayed_checkout_progress ! test_terminal git checkout --quiet $opt
+	'
+
+	test_expect_success PERL,TTY "delayed checkout honors --[no]-progress ($mode checkout)" '
+		test_delayed_checkout_progress ! test_terminal git checkout --no-progress $opt &&
+		test_delayed_checkout_progress test_terminal git checkout --quiet --progress $opt
+	'
+done
+
+test_expect_success 'delayed checkout correctly reports the number of updated entries' '
+	rm -rf repo &&
+	git init repo &&
+	(
+		cd repo &&
+		git config filter.delay.process "test-tool rot13-filter --log=delayed.log clean smudge delay" &&
+		git config filter.delay.required true &&
+
+		echo "*.a filter=delay" >.gitattributes &&
+		echo a >test-delay10.a &&
+		echo a >test-delay11.a &&
+		git add . &&
+		git commit -m files &&
+
+		rm *.a &&
+		git checkout . 2>err &&
+		grep "IN: smudge test-delay10.a .* \\[DELAYED\\]" delayed.log &&
+		grep "IN: smudge test-delay11.a .* \\[DELAYED\\]" delayed.log &&
+		grep "Updated 2 paths from the index" err
+	)
+'
+
 test_done
diff --git a/t/t0021/rot13-filter.pl b/t/t0021/rot13-filter.pl
deleted file mode 100644
index cd32a82..0000000
--- a/t/t0021/rot13-filter.pl
+++ /dev/null
@@ -1,232 +0,0 @@
-#
-# Example implementation for the Git filter protocol version 2
-# See Documentation/gitattributes.txt, section "Filter Protocol"
-#
-# The first argument defines a debug log file that the script write to.
-# All remaining arguments define a list of supported protocol
-# capabilities ("clean", "smudge", etc).
-#
-# This implementation supports special test cases:
-# (1) If data with the pathname "clean-write-fail.r" is processed with
-#     a "clean" operation then the write operation will die.
-# (2) If data with the pathname "smudge-write-fail.r" is processed with
-#     a "smudge" operation then the write operation will die.
-# (3) If data with the pathname "error.r" is processed with any
-#     operation then the filter signals that it cannot or does not want
-#     to process the file.
-# (4) If data with the pathname "abort.r" is processed with any
-#     operation then the filter signals that it cannot or does not want
-#     to process the file and any file after that is processed with the
-#     same command.
-# (5) If data with a pathname that is a key in the DELAY hash is
-#     requested (e.g. "test-delay10.a") then the filter responds with
-#     a "delay" status and sets the "requested" field in the DELAY hash.
-#     The filter will signal the availability of this object after
-#     "count" (field in DELAY hash) "list_available_blobs" commands.
-# (6) If data with the pathname "missing-delay.a" is processed that the
-#     filter will drop the path from the "list_available_blobs" response.
-# (7) If data with the pathname "invalid-delay.a" is processed that the
-#     filter will add the path "unfiltered" which was not delayed before
-#     to the "list_available_blobs" response.
-#
-
-use 5.008;
-sub gitperllib {
-	# Git assumes that all path lists are Unix-y colon-separated ones. But
-	# when the Git for Windows executes the test suite, its MSYS2 Bash
-	# calls git.exe, and colon-separated path lists are converted into
-	# Windows-y semicolon-separated lists of *Windows* paths (which
-	# naturally contain a colon after the drive letter, so splitting by
-	# colons simply does not cut it).
-	#
-	# Detect semicolon-separated path list and handle them appropriately.
-
-	if ($ENV{GITPERLLIB} =~ /;/) {
-		return split(/;/, $ENV{GITPERLLIB});
-	}
-	return split(/:/, $ENV{GITPERLLIB});
-}
-use lib (gitperllib());
-use strict;
-use warnings;
-use IO::File;
-use Git::Packet;
-
-my $MAX_PACKET_CONTENT_SIZE = 65516;
-my $log_file                = shift @ARGV;
-my @capabilities            = @ARGV;
-
-open my $debug, ">>", $log_file or die "cannot open log file: $!";
-
-my %DELAY = (
-	'test-delay10.a' => { "requested" => 0, "count" => 1 },
-	'test-delay11.a' => { "requested" => 0, "count" => 1 },
-	'test-delay20.a' => { "requested" => 0, "count" => 2 },
-	'test-delay10.b' => { "requested" => 0, "count" => 1 },
-	'missing-delay.a' => { "requested" => 0, "count" => 1 },
-	'invalid-delay.a' => { "requested" => 0, "count" => 1 },
-);
-
-sub rot13 {
-	my $str = shift;
-	$str =~ y/A-Za-z/N-ZA-Mn-za-m/;
-	return $str;
-}
-
-print $debug "START\n";
-$debug->flush();
-
-packet_initialize("git-filter", 2);
-
-my %remote_caps = packet_read_and_check_capabilities("clean", "smudge", "delay");
-packet_check_and_write_capabilities(\%remote_caps, @capabilities);
-
-print $debug "init handshake complete\n";
-$debug->flush();
-
-while (1) {
-	my ( $res, $command ) = packet_key_val_read("command");
-	if ( $res == -1 ) {
-		print $debug "STOP\n";
-		exit();
-	}
-	print $debug "IN: $command";
-	$debug->flush();
-
-	if ( $command eq "list_available_blobs" ) {
-		# Flush
-		packet_compare_lists([1, ""], packet_bin_read()) ||
-			die "bad list_available_blobs end";
-
-		foreach my $pathname ( sort keys %DELAY ) {
-			if ( $DELAY{$pathname}{"requested"} >= 1 ) {
-				$DELAY{$pathname}{"count"} = $DELAY{$pathname}{"count"} - 1;
-				if ( $pathname eq "invalid-delay.a" ) {
-					# Send Git a pathname that was not delayed earlier
-					packet_txt_write("pathname=unfiltered");
-				}
-				if ( $pathname eq "missing-delay.a" ) {
-					# Do not signal Git that this file is available
-				} elsif ( $DELAY{$pathname}{"count"} == 0 ) {
-					print $debug " $pathname";
-					packet_txt_write("pathname=$pathname");
-				}
-			}
-		}
-
-		packet_flush();
-
-		print $debug " [OK]\n";
-		$debug->flush();
-		packet_txt_write("status=success");
-		packet_flush();
-	} else {
-		my ( $res, $pathname ) = packet_key_val_read("pathname");
-		if ( $res == -1 ) {
-			die "unexpected EOF while expecting pathname";
-		}
-		print $debug " $pathname";
-		$debug->flush();
-
-		# Read until flush
-		my ( $done, $buffer ) = packet_txt_read();
-		while ( $buffer ne '' ) {
-			if ( $buffer eq "can-delay=1" ) {
-				if ( exists $DELAY{$pathname} and $DELAY{$pathname}{"requested"} == 0 ) {
-					$DELAY{$pathname}{"requested"} = 1;
-				}
-			} elsif ($buffer =~ /^(ref|treeish|blob)=/) {
-				print $debug " $buffer";
-			} else {
-				# In general, filters need to be graceful about
-				# new metadata, since it's documented that we
-				# can pass any key-value pairs, but for tests,
-				# let's be a little stricter.
-				die "Unknown message '$buffer'";
-			}
-
-			( $done, $buffer ) = packet_txt_read();
-		}
-		if ( $done == -1 ) {
-			die "unexpected EOF after pathname '$pathname'";
-		}
-
-		my $input = "";
-		{
-			binmode(STDIN);
-			my $buffer;
-			my $done = 0;
-			while ( !$done ) {
-				( $done, $buffer ) = packet_bin_read();
-				$input .= $buffer;
-			}
-			if ( $done == -1 ) {
-				die "unexpected EOF while reading input for '$pathname'";
-			}			
-			print $debug " " . length($input) . " [OK] -- ";
-			$debug->flush();
-		}
-
-		my $output;
-		if ( exists $DELAY{$pathname} and exists $DELAY{$pathname}{"output"} ) {
-			$output = $DELAY{$pathname}{"output"}
-		} elsif ( $pathname eq "error.r" or $pathname eq "abort.r" ) {
-			$output = "";
-		} elsif ( $command eq "clean" and grep( /^clean$/, @capabilities ) ) {
-			$output = rot13($input);
-		} elsif ( $command eq "smudge" and grep( /^smudge$/, @capabilities ) ) {
-			$output = rot13($input);
-		} else {
-			die "bad command '$command'";
-		}
-
-		if ( $pathname eq "error.r" ) {
-			print $debug "[ERROR]\n";
-			$debug->flush();
-			packet_txt_write("status=error");
-			packet_flush();
-		} elsif ( $pathname eq "abort.r" ) {
-			print $debug "[ABORT]\n";
-			$debug->flush();
-			packet_txt_write("status=abort");
-			packet_flush();
-		} elsif ( $command eq "smudge" and
-			exists $DELAY{$pathname} and
-			$DELAY{$pathname}{"requested"} == 1 ) {
-			print $debug "[DELAYED]\n";
-			$debug->flush();
-			packet_txt_write("status=delayed");
-			packet_flush();
-			$DELAY{$pathname}{"requested"} = 2;
-			$DELAY{$pathname}{"output"} = $output;
-		} else {
-			packet_txt_write("status=success");
-			packet_flush();
-
-			if ( $pathname eq "${command}-write-fail.r" ) {
-				print $debug "[WRITE FAIL]\n";
-				$debug->flush();
-				die "${command} write error";
-			}
-
-			print $debug "OUT: " . length($output) . " ";
-			$debug->flush();
-
-			while ( length($output) > 0 ) {
-				my $packet = substr( $output, 0, $MAX_PACKET_CONTENT_SIZE );
-				packet_bin_write($packet);
-				# dots represent the number of packets
-				print $debug ".";
-				if ( length($output) > $MAX_PACKET_CONTENT_SIZE ) {
-					$output = substr( $output, $MAX_PACKET_CONTENT_SIZE );
-				} else {
-					$output = "";
-				}
-			}
-			packet_flush();
-			print $debug " [OK]\n";
-			$debug->flush();
-			packet_flush();
-		}
-	}
-}
diff --git a/t/t0022-crlf-rename.sh b/t/t0022-crlf-rename.sh
index 7af3fbc..9fe9891 100755
--- a/t/t0022-crlf-rename.sh
+++ b/t/t0022-crlf-rename.sh
@@ -2,6 +2,7 @@
 
 test_description='ignore CR in CRLF sequence while computing similiarity'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -23,8 +24,8 @@ test_expect_success setup '
 
 test_expect_success 'diff -M' '
 
-	git diff-tree -M -r --name-status HEAD^ HEAD |
-	sed -e "s/R[0-9]*/RNUM/" >actual &&
+	git diff-tree -M -r --name-status HEAD^ HEAD >tmp &&
+	sed -e "s/R[0-9]*/RNUM/" tmp >actual &&
 	echo "RNUM	sample	elpmas" >expect &&
 	test_cmp expect actual
 
diff --git a/t/t0023-crlf-am.sh b/t/t0023-crlf-am.sh
index f9bbb91..5758055 100755
--- a/t/t0023-crlf-am.sh
+++ b/t/t0023-crlf-am.sh
@@ -2,6 +2,7 @@
 
 test_description='Test am with auto.crlf'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 cat >patchfile <<\EOF
diff --git a/t/t0024-crlf-archive.sh b/t/t0024-crlf-archive.sh
index 4e9fa3c..a7f4de4 100755
--- a/t/t0024-crlf-archive.sh
+++ b/t/t0024-crlf-archive.sh
@@ -2,13 +2,14 @@
 
 test_description='respect crlf in git archive'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
 
 	git config core.autocrlf true &&
 
-	printf "CRLF line ending\r\nAnd another\r\n" > sample &&
+	printf "CRLF line ending\r\nAnd another\r\n" >sample &&
 	git add sample &&
 
 	test_tick &&
@@ -18,8 +19,9 @@ test_expect_success setup '
 
 test_expect_success 'tar archive' '
 
-	git archive --format=tar HEAD |
-	( mkdir untarred && cd untarred && "$TAR" -xf - ) &&
+	git archive --format=tar HEAD >test.tar &&
+	mkdir untarred &&
+	"$TAR" xf test.tar -C untarred &&
 
 	test_cmp sample untarred/sample
 
@@ -29,7 +31,11 @@ test_expect_success UNZIP 'zip archive' '
 
 	git archive --format=zip HEAD >test.zip &&
 
-	( mkdir unzipped && cd unzipped && "$GIT_UNZIP" ../test.zip ) &&
+	mkdir unzipped &&
+	(
+		cd unzipped &&
+		"$GIT_UNZIP" ../test.zip
+	) &&
 
 	test_cmp sample unzipped/sample
 
diff --git a/t/t0025-crlf-renormalize.sh b/t/t0025-crlf-renormalize.sh
index e13363a..f7202c1 100755
--- a/t/t0025-crlf-renormalize.sh
+++ b/t/t0025-crlf-renormalize.sh
@@ -2,6 +2,7 @@
 
 test_description='CRLF renormalization'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -21,8 +22,8 @@ test_expect_success 'renormalize CRLF in repo' '
 	i/lf w/lf attr/text=auto LF.txt
 	i/lf w/mixed attr/text=auto CRLF_mix_LF.txt
 	EOF
-	git ls-files --eol |
-	sed -e "s/	/ /g" -e "s/  */ /g" |
+	git ls-files --eol >tmp &&
+	sed -e "s/	/ /g" -e "s/  */ /g" tmp |
 	sort >actual &&
 	test_cmp expect actual
 '
diff --git a/t/t0026-eol-config.sh b/t/t0026-eol-config.sh
index c5203e2..f426a18 100755
--- a/t/t0026-eol-config.sh
+++ b/t/t0026-eol-config.sh
@@ -2,6 +2,7 @@
 
 test_description='CRLF conversion'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 has_cr() {
@@ -14,8 +15,8 @@ test_expect_success setup '
 
 	echo "one text" > .gitattributes &&
 
-	for w in Hello world how are you; do echo $w; done >one &&
-	for w in I am very very fine thank you; do echo $w; done >two &&
+	test_write_lines Hello world how are you >one &&
+	test_write_lines I am very very fine thank you >two &&
 	git add . &&
 
 	git commit -m initial &&
diff --git a/t/t0027-auto-crlf.sh b/t/t0027-auto-crlf.sh
index 9fcd56f..2f57c86 100755
--- a/t/t0027-auto-crlf.sh
+++ b/t/t0027-auto-crlf.sh
@@ -2,6 +2,7 @@
 
 test_description='CRLF conversion all combinations'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 compare_files () {
@@ -69,7 +70,8 @@ create_NNO_MIX_files () {
 				cp CRLF        ${pfx}_CRLF.txt &&
 				cp CRLF_mix_LF ${pfx}_CRLF_mix_LF.txt &&
 				cp LF_mix_CR   ${pfx}_LF_mix_CR.txt &&
-				cp CRLF_nul    ${pfx}_CRLF_nul.txt
+				cp CRLF_nul    ${pfx}_CRLF_nul.txt ||
+				return 1
 			done
 		done
 	done
@@ -77,13 +79,13 @@ create_NNO_MIX_files () {
 
 check_warning () {
 	case "$1" in
-	LF_CRLF) echo "warning: LF will be replaced by CRLF" >"$2".expect ;;
-	CRLF_LF) echo "warning: CRLF will be replaced by LF" >"$2".expect ;;
-	'')	                                                 >"$2".expect ;;
+	LF_CRLF) echo "LF will be replaced by CRLF" >"$2".expect ;;
+	CRLF_LF) echo "CRLF will be replaced by LF" >"$2".expect ;;
+	'')	                                    >"$2".expect ;;
 	*) echo >&2 "Illegal 1": "$1" ; return false ;;
 	esac
-	grep "will be replaced by" "$2" | sed -e "s/\(.*\) in [^ ]*$/\1/" | uniq  >"$2".actual
-	test_i18ncmp "$2".expect "$2".actual
+	sed -e "s/^.* \([^ ]* will be replaced by [^ ]*\) .*$/\1/" "$2" | uniq  >"$2".actual
+	test_cmp "$2".expect "$2".actual
 }
 
 commit_check_warn () {
@@ -100,7 +102,8 @@ commit_check_warn () {
 	do
 		fname=${pfx}_$f.txt &&
 		cp $f $fname &&
-		git -c core.autocrlf=$crlf add $fname 2>"${pfx}_$f.err"
+		git -c core.autocrlf=$crlf add $fname 2>"${pfx}_$f.err" ||
+		return 1
 	done &&
 	git commit -m "core.autocrlf $crlf" &&
 	check_warning "$lfname" ${pfx}_LF.err &&
@@ -120,15 +123,19 @@ commit_chk_wrnNNO () {
 	lfmixcr=$1 ; shift
 	crlfnul=$1 ; shift
 	pfx=NNO_attr_${attr}_aeol_${aeol}_${crlf}
-	#Commit files on top of existing file
-	create_gitattributes "$attr" $aeol &&
-	for f in LF CRLF CRLF_mix_LF LF_mix_CR CRLF_nul
-	do
-		fname=${pfx}_$f.txt &&
-		cp $f $fname &&
-		printf Z >>"$fname" &&
-		git -c core.autocrlf=$crlf add $fname 2>"${pfx}_$f.err"
-	done
+
+	test_expect_success 'setup commit NNO files' '
+		#Commit files on top of existing file
+		create_gitattributes "$attr" $aeol &&
+		for f in LF CRLF CRLF_mix_LF LF_mix_CR CRLF_nul
+		do
+			fname=${pfx}_$f.txt &&
+			cp $f $fname &&
+			printf Z >>"$fname" &&
+			git -c core.autocrlf=$crlf add $fname 2>"${pfx}_$f.err" ||
+			return 1
+		done
+	'
 
 	test_expect_success "commit NNO files crlf=$crlf attr=$attr LF" '
 		check_warning "$lfwarn" ${pfx}_LF.err
@@ -162,15 +169,19 @@ commit_MIX_chkwrn () {
 	lfmixcr=$1 ; shift
 	crlfnul=$1 ; shift
 	pfx=MIX_attr_${attr}_aeol_${aeol}_${crlf}
-	#Commit file with CLRF_mix_LF on top of existing file
-	create_gitattributes "$attr" $aeol &&
-	for f in LF CRLF CRLF_mix_LF LF_mix_CR CRLF_nul
-	do
-		fname=${pfx}_$f.txt &&
-		cp CRLF_mix_LF $fname &&
-		printf Z >>"$fname" &&
-		git -c core.autocrlf=$crlf add $fname 2>"${pfx}_$f.err"
-	done
+
+	test_expect_success 'setup commit file with mixed EOL' '
+		#Commit file with CLRF_mix_LF on top of existing file
+		create_gitattributes "$attr" $aeol &&
+		for f in LF CRLF CRLF_mix_LF LF_mix_CR CRLF_nul
+		do
+			fname=${pfx}_$f.txt &&
+			cp CRLF_mix_LF $fname &&
+			printf Z >>"$fname" &&
+			git -c core.autocrlf=$crlf add $fname 2>"${pfx}_$f.err" ||
+			return 1
+		done
+	'
 
 	test_expect_success "commit file with mixed EOL onto LF crlf=$crlf attr=$attr" '
 		check_warning "$lfwarn" ${pfx}_LF.err
@@ -288,17 +299,17 @@ checkout_files () {
 	lfmixcrlf=$1 ; shift
 	lfmixcr=$1 ; shift
 	crlfnul=$1 ; shift
-	create_gitattributes "$attr" $ident $aeol &&
-	git config core.autocrlf $crlf &&
+	test_expect_success "setup config for checkout attr=$attr ident=$ident aeol=$aeol core.autocrlf=$crlf" '
+		create_gitattributes "$attr" $ident $aeol &&
+		git config core.autocrlf $crlf
+	'
 	pfx=eol_${ceol}_crlf_${crlf}_attr_${attr}_ &&
 	for f in LF CRLF LF_mix_CR CRLF_mix_LF LF_nul
 	do
-		rm crlf_false_attr__$f.txt &&
-		if test -z "$ceol"; then
-			git checkout -- crlf_false_attr__$f.txt
-		else
-			git -c core.eol=$ceol checkout -- crlf_false_attr__$f.txt
-		fi
+		test_expect_success "setup $f checkout ${ceol:+ with -c core.eol=$ceol}"  '
+			rm -f crlf_false_attr__$f.txt &&
+			git ${ceol:+-c core.eol=$ceol} checkout -- crlf_false_attr__$f.txt
+		'
 	done
 
 	test_expect_success "ls-files --eol attr=$attr $ident aeol=$aeol core.autocrlf=$crlf core.eol=$ceol" '
@@ -311,8 +322,8 @@ checkout_files () {
 		i/-text w/$(stats_ascii $crlfnul) attr/$(attr_ascii $attr $aeol) crlf_false_attr__CRLF_nul.txt
 		i/-text w/$(stats_ascii $crlfnul) attr/$(attr_ascii $attr $aeol) crlf_false_attr__LF_nul.txt
 		EOF
-		git ls-files --eol crlf_false_attr__* |
-		sed -e "s/	/ /g" -e "s/  */ /g" |
+		git ls-files --eol crlf_false_attr__* >tmp &&
+		sed -e "s/	/ /g" -e "s/  */ /g" tmp |
 		sort >actual &&
 		test_cmp expect actual
 	'
@@ -359,18 +370,18 @@ test_expect_success 'ls-files --eol -o Text/Binary' '
 	i/ w/crlf TeBi_126_CL
 	i/ w/-text TeBi_126_CLC
 	EOF
-	git ls-files --eol -o |
+	git ls-files --eol -o >tmp &&
 	sed -n -e "/TeBi_/{s!attr/[	]*!!g
 	s!	! !g
 	s!  *! !g
 	p
-	}" | sort >actual &&
+	}" tmp | sort >actual &&
 	test_cmp expect actual
 '
 
-test_expect_success 'setup master' '
+test_expect_success 'setup main' '
 	echo >.gitattributes &&
-	git checkout -b master &&
+	git checkout -b main &&
 	git add .gitattributes &&
 	git commit -m "add .gitattributes" . &&
 	printf "\$Id: 0000000000000000000000000000000000000000 \$\nLINEONE\nLINETWO\nLINETHREE"     >LF &&
@@ -595,6 +606,12 @@ do
 	# auto: core.autocrlf=false and core.eol unset(or native) uses native eol
 	checkout_files     auto  "$id" ""     false   ""       $NL   CRLF  CRLF_mix_LF  LF_mix_CR    LF_nul
 	checkout_files     auto  "$id" ""     false   native   $NL   CRLF  CRLF_mix_LF  LF_mix_CR    LF_nul
+	# core.autocrlf false, .gitattributes sets eol
+	checkout_files     ""    "$id" "lf"   false   ""       LF    CRLF  CRLF_mix_LF  LF_mix_CR    LF_nul
+	checkout_files     ""    "$id" "crlf" false   ""       CRLF  CRLF  CRLF         CRLF_mix_CR  CRLF_nul
+	# core.autocrlf true, .gitattributes sets eol
+	checkout_files     ""    "$id" "lf"   true    ""       LF    CRLF  CRLF_mix_LF  LF_mix_CR    LF_nul
+	checkout_files     ""    "$id" "crlf" true    ""       CRLF  CRLF  CRLF         CRLF_mix_CR  CRLF_nul
 done
 
 # Should be the last test case: remove some files from the worktree
@@ -606,8 +623,8 @@ test_expect_success 'ls-files --eol -d -z' '
 	i/lf w/ crlf_false_attr__LF.txt
 	i/mixed w/ crlf_false_attr__CRLF_mix_LF.txt
 	EOF
-	git ls-files --eol -d |
-	sed -e "s!attr/[^	]*!!g" -e "s/	/ /g" -e "s/  */ /g" |
+	git ls-files --eol -d >tmp &&
+	sed -e "s!attr/[^	]*!!g" -e "s/	/ /g" -e "s/  */ /g" tmp |
 	sort >actual &&
 	test_cmp expect actual
 '
diff --git a/t/t0028-working-tree-encoding.sh b/t/t0028-working-tree-encoding.sh
index bfc4fb9..ad151a3 100755
--- a/t/t0028-working-tree-encoding.sh
+++ b/t/t0028-working-tree-encoding.sh
@@ -2,34 +2,16 @@
 
 test_description='working-tree-encoding conversion via gitattributes'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
+TEST_CREATE_REPO_NO_TEMPLATE=1
 . ./test-lib.sh
+. "$TEST_DIRECTORY/lib-encoding.sh"
 
 GIT_TRACE_WORKING_TREE_ENCODING=1 && export GIT_TRACE_WORKING_TREE_ENCODING
 
-test_lazy_prereq NO_UTF16_BOM '
-	test $(printf abc | iconv -f UTF-8 -t UTF-16 | wc -c) = 6
-'
-
-test_lazy_prereq NO_UTF32_BOM '
-	test $(printf abc | iconv -f UTF-8 -t UTF-32 | wc -c) = 12
-'
-
-write_utf16 () {
-	if test_have_prereq NO_UTF16_BOM
-	then
-		printf '\376\377'
-	fi &&
-	iconv -f UTF-8 -t UTF-16
-}
-
-write_utf32 () {
-	if test_have_prereq NO_UTF32_BOM
-	then
-		printf '\0\0\376\377'
-	fi &&
-	iconv -f UTF-8 -t UTF-32
-}
-
 test_expect_success 'setup test files' '
 	git config core.eol lf &&
 
@@ -89,6 +71,7 @@ test_expect_success 'check $GIT_DIR/info/attributes support' '
 	test_when_finished "rm -f test.utf32.git" &&
 	test_when_finished "git reset --hard HEAD" &&
 
+	mkdir .git/info &&
 	echo "*.utf32 text working-tree-encoding=utf-32" >.git/info/attributes &&
 	git add test.utf32 &&
 
@@ -109,23 +92,23 @@ do
 		# In these cases the BOM is prohibited.
 		cp bebom.utf${i}be.raw bebom.utf${i}be &&
 		test_must_fail git add bebom.utf${i}be 2>err.out &&
-		test_i18ngrep "fatal: BOM is prohibited .* utf-${i}be" err.out &&
-		test_i18ngrep "use UTF-${i} as working-tree-encoding" err.out &&
+		test_grep "fatal: BOM is prohibited .* utf-${i}be" err.out &&
+		test_grep "use UTF-${i} as working-tree-encoding" err.out &&
 
 		cp lebom.utf${i}le.raw lebom.utf${i}be &&
 		test_must_fail git add lebom.utf${i}be 2>err.out &&
-		test_i18ngrep "fatal: BOM is prohibited .* utf-${i}be" err.out &&
-		test_i18ngrep "use UTF-${i} as working-tree-encoding" err.out &&
+		test_grep "fatal: BOM is prohibited .* utf-${i}be" err.out &&
+		test_grep "use UTF-${i} as working-tree-encoding" err.out &&
 
 		cp bebom.utf${i}be.raw bebom.utf${i}le &&
 		test_must_fail git add bebom.utf${i}le 2>err.out &&
-		test_i18ngrep "fatal: BOM is prohibited .* utf-${i}LE" err.out &&
-		test_i18ngrep "use UTF-${i} as working-tree-encoding" err.out &&
+		test_grep "fatal: BOM is prohibited .* utf-${i}LE" err.out &&
+		test_grep "use UTF-${i} as working-tree-encoding" err.out &&
 
 		cp lebom.utf${i}le.raw lebom.utf${i}le &&
 		test_must_fail git add lebom.utf${i}le 2>err.out &&
-		test_i18ngrep "fatal: BOM is prohibited .* utf-${i}LE" err.out &&
-		test_i18ngrep "use UTF-${i} as working-tree-encoding" err.out
+		test_grep "fatal: BOM is prohibited .* utf-${i}LE" err.out &&
+		test_grep "use UTF-${i} as working-tree-encoding" err.out
 	'
 
 	test_expect_success "check required UTF-${i} BOM" '
@@ -135,21 +118,21 @@ do
 
 		cp nobom.utf${i}be.raw nobom.utf${i} &&
 		test_must_fail git add nobom.utf${i} 2>err.out &&
-		test_i18ngrep "fatal: BOM is required .* utf-${i}" err.out &&
-		test_i18ngrep "use UTF-${i}BE or UTF-${i}LE" err.out &&
+		test_grep "fatal: BOM is required .* utf-${i}" err.out &&
+		test_grep "use UTF-${i}BE or UTF-${i}LE" err.out &&
 
 		cp nobom.utf${i}le.raw nobom.utf${i} &&
 		test_must_fail git add nobom.utf${i} 2>err.out &&
-		test_i18ngrep "fatal: BOM is required .* utf-${i}" err.out &&
-		test_i18ngrep "use UTF-${i}BE or UTF-${i}LE" err.out
+		test_grep "fatal: BOM is required .* utf-${i}" err.out &&
+		test_grep "use UTF-${i}BE or UTF-${i}LE" err.out
 	'
 
 	test_expect_success "eol conversion for UTF-${i} encoded files on checkout" '
 		test_when_finished "rm -f crlf.utf${i}.raw lf.utf${i}.raw" &&
 		test_when_finished "git reset --hard HEAD^" &&
 
-		cat lf.utf8.raw | write_utf${i} >lf.utf${i}.raw &&
-		cat crlf.utf8.raw | write_utf${i} >crlf.utf${i}.raw &&
+		write_utf${i} <lf.utf8.raw >lf.utf${i}.raw &&
+		write_utf${i} <crlf.utf8.raw >crlf.utf${i}.raw &&
 		cp crlf.utf${i}.raw eol.utf${i} &&
 
 		cat >expectIndexLF <<-EOF &&
@@ -186,7 +169,7 @@ test_expect_success 'check unsupported encodings' '
 	echo "*.set text working-tree-encoding" >.gitattributes &&
 	printf "set" >t.set &&
 	test_must_fail git add t.set 2>err.out &&
-	test_i18ngrep "true/false are no valid working-tree-encodings" err.out &&
+	test_grep "true/false are no valid working-tree-encodings" err.out &&
 
 	echo "*.unset text -working-tree-encoding" >.gitattributes &&
 	printf "unset" >t.unset &&
@@ -199,7 +182,7 @@ test_expect_success 'check unsupported encodings' '
 	echo "*.garbage text working-tree-encoding=garbage" >.gitattributes &&
 	printf "garbage" >t.garbage &&
 	test_must_fail git add t.garbage 2>err.out &&
-	test_i18ngrep "failed to encode" err.out
+	test_grep "failed to encode" err.out
 '
 
 test_expect_success 'error if encoding round trip is not the same during refresh' '
@@ -215,10 +198,10 @@ test_expect_success 'error if encoding round trip is not the same during refresh
 	TEST_HASH=$(git hash-object --no-filters -w nonsense.utf16le) &&
 	git update-index --add --cacheinfo 100644 $TEST_HASH nonsense.utf16le &&
 	COMMIT=$(git commit-tree -p $(git rev-parse HEAD) -m "plain commit" $(git write-tree)) &&
-	git update-ref refs/heads/master $COMMIT &&
+	git update-ref refs/heads/main $COMMIT &&
 
 	test_must_fail git checkout HEAD^ 2>err.out &&
-	test_i18ngrep "error: .* overwritten by checkout:" err.out
+	test_grep "error: .* overwritten by checkout:" err.out
 '
 
 test_expect_success 'error if encoding garbage is already in Git' '
@@ -231,10 +214,10 @@ test_expect_success 'error if encoding garbage is already in Git' '
 	TEST_HASH=$(git hash-object --no-filters -w nonsense.utf16) &&
 	git update-index --add --cacheinfo 100644 $TEST_HASH nonsense.utf16 &&
 	COMMIT=$(git commit-tree -p $(git rev-parse HEAD) -m "plain commit" $(git write-tree)) &&
-	git update-ref refs/heads/master $COMMIT &&
+	git update-ref refs/heads/main $COMMIT &&
 
 	git diff 2>err.out &&
-	test_i18ngrep "error: BOM is required" err.out
+	test_grep "error: BOM is required" err.out
 '
 
 test_lazy_prereq ICONV_SHIFT_JIS '
diff --git a/t/t0029-core-unsetenvvars.sh b/t/t0029-core-unsetenvvars.sh
index 24ce46a..4e8e90d 100755
--- a/t/t0029-core-unsetenvvars.sh
+++ b/t/t0029-core-unsetenvvars.sh
@@ -2,6 +2,7 @@
 
 test_description='test the Windows-only core.unsetenvvars setting'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 if ! test_have_prereq MINGW
@@ -11,8 +12,7 @@ then
 fi
 
 test_expect_success 'setup' '
-	mkdir -p "$TRASH_DIRECTORY/.git/hooks" &&
-	write_script "$TRASH_DIRECTORY/.git/hooks/pre-commit" <<-\EOF
+	test_hook --setup pre-commit <<-\EOF
 	echo $HOBBES >&2
 	EOF
 '
diff --git a/t/t0030-stripspace.sh b/t/t0030-stripspace.sh
index 0c24a0f..f10f42f 100755
--- a/t/t0030-stripspace.sh
+++ b/t/t0030-stripspace.sh
@@ -5,6 +5,7 @@
 
 test_description='git stripspace'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 t40='A quick brown fox jumps over the lazy do'
@@ -12,379 +13,382 @@ s40='                                        '
 sss="$s40$s40$s40$s40$s40$s40$s40$s40$s40$s40" # 400
 ttt="$t40$t40$t40$t40$t40$t40$t40$t40$t40$t40" # 400
 
-test_expect_success \
-    'long lines without spaces should be unchanged' '
-    echo "$ttt" >expect &&
-    git stripspace <expect >actual &&
-    test_cmp expect actual &&
+printf_git_stripspace () {
+    printf "$1" | git stripspace
+}
 
-    echo "$ttt$ttt" >expect &&
-    git stripspace <expect >actual &&
-    test_cmp expect actual &&
+test_expect_success 'long lines without spaces should be unchanged' '
+	echo "$ttt" >expect &&
+	git stripspace <expect >actual &&
+	test_cmp expect actual &&
 
-    echo "$ttt$ttt$ttt" >expect &&
-    git stripspace <expect >actual &&
-    test_cmp expect actual &&
+	echo "$ttt$ttt" >expect &&
+	git stripspace <expect >actual &&
+	test_cmp expect actual &&
 
-    echo "$ttt$ttt$ttt$ttt" >expect &&
-    git stripspace <expect >actual &&
-    test_cmp expect actual
+	echo "$ttt$ttt$ttt" >expect &&
+	git stripspace <expect >actual &&
+	test_cmp expect actual &&
+
+	echo "$ttt$ttt$ttt$ttt" >expect &&
+	git stripspace <expect >actual &&
+	test_cmp expect actual
 '
 
-test_expect_success \
-    'lines with spaces at the beginning should be unchanged' '
-    echo "$sss$ttt" >expect &&
-    git stripspace <expect >actual &&
-    test_cmp expect actual &&
+test_expect_success 'lines with spaces at the beginning should be unchanged' '
+	echo "$sss$ttt" >expect &&
+	git stripspace <expect >actual &&
+	test_cmp expect actual &&
 
-    echo "$sss$sss$ttt" >expect &&
-    git stripspace <expect >actual &&
-    test_cmp expect actual &&
+	echo "$sss$sss$ttt" >expect &&
+	git stripspace <expect >actual &&
+	test_cmp expect actual &&
 
-    echo "$sss$sss$sss$ttt" >expect &&
-    git stripspace <expect >actual &&
-    test_cmp expect actual
+	echo "$sss$sss$sss$ttt" >expect &&
+	git stripspace <expect >actual &&
+	test_cmp expect actual
 '
 
-test_expect_success \
-    'lines with intermediate spaces should be unchanged' '
-    echo "$ttt$sss$ttt" >expect &&
-    git stripspace <expect >actual &&
-    test_cmp expect actual &&
+test_expect_success 'lines with intermediate spaces should be unchanged' '
+	echo "$ttt$sss$ttt" >expect &&
+	git stripspace <expect >actual &&
+	test_cmp expect actual &&
 
-    echo "$ttt$sss$sss$ttt" >expect &&
-    git stripspace <expect >actual &&
-    test_cmp expect actual
+	echo "$ttt$sss$sss$ttt" >expect &&
+	git stripspace <expect >actual &&
+	test_cmp expect actual
 '
 
-test_expect_success \
-    'consecutive blank lines should be unified' '
-    printf "$ttt\n\n$ttt\n" > expect &&
-    printf "$ttt\n\n\n\n\n$ttt\n" | git stripspace >actual &&
-    test_cmp expect actual &&
+test_expect_success 'consecutive blank lines should be unified' '
+	printf "$ttt\n\n$ttt\n" > expect &&
+	printf "$ttt\n\n\n\n\n$ttt\n" | git stripspace >actual &&
+	test_cmp expect actual &&
 
-    printf "$ttt$ttt\n\n$ttt\n" > expect &&
-    printf "$ttt$ttt\n\n\n\n\n$ttt\n" | git stripspace >actual &&
-    test_cmp expect actual &&
+	printf "$ttt$ttt\n\n$ttt\n" > expect &&
+	printf "$ttt$ttt\n\n\n\n\n$ttt\n" | git stripspace >actual &&
+	test_cmp expect actual &&
 
-    printf "$ttt$ttt$ttt\n\n$ttt\n" > expect &&
-    printf "$ttt$ttt$ttt\n\n\n\n\n$ttt\n" | git stripspace >actual &&
-    test_cmp expect actual &&
+	printf "$ttt$ttt$ttt\n\n$ttt\n" > expect &&
+	printf "$ttt$ttt$ttt\n\n\n\n\n$ttt\n" | git stripspace >actual &&
+	test_cmp expect actual &&
 
-    printf "$ttt\n\n$ttt\n" > expect &&
-    printf "$ttt\n\n\n\n\n$ttt\n" | git stripspace >actual &&
-    test_cmp expect actual &&
+	printf "$ttt\n\n$ttt\n" > expect &&
+	printf "$ttt\n\n\n\n\n$ttt\n" | git stripspace >actual &&
+	test_cmp expect actual &&
 
-    printf "$ttt\n\n$ttt$ttt\n" > expect &&
-    printf "$ttt\n\n\n\n\n$ttt$ttt\n" | git stripspace >actual &&
-    test_cmp expect actual &&
+	printf "$ttt\n\n$ttt$ttt\n" > expect &&
+	printf "$ttt\n\n\n\n\n$ttt$ttt\n" | git stripspace >actual &&
+	test_cmp expect actual &&
 
-    printf "$ttt\n\n$ttt$ttt$ttt\n" > expect &&
-    printf "$ttt\n\n\n\n\n$ttt$ttt$ttt\n" | git stripspace >actual &&
-    test_cmp expect actual &&
+	printf "$ttt\n\n$ttt$ttt$ttt\n" > expect &&
+	printf "$ttt\n\n\n\n\n$ttt$ttt$ttt\n" | git stripspace >actual &&
+	test_cmp expect actual &&
 
-    printf "$ttt\n\n$ttt\n" > expect &&
-    printf "$ttt\n\t\n \n\n  \t\t\n$ttt\n" | git stripspace >actual &&
-    test_cmp expect actual &&
+	printf "$ttt\n\n$ttt\n" > expect &&
+	printf "$ttt\n\t\n \n\n  \t\t\n$ttt\n" | git stripspace >actual &&
+	test_cmp expect actual &&
 
-    printf "$ttt$ttt\n\n$ttt\n" > expect &&
-    printf "$ttt$ttt\n\t\n \n\n  \t\t\n$ttt\n" | git stripspace >actual &&
-    test_cmp expect actual &&
+	printf "$ttt$ttt\n\n$ttt\n" > expect &&
+	printf "$ttt$ttt\n\t\n \n\n  \t\t\n$ttt\n" | git stripspace >actual &&
+	test_cmp expect actual &&
 
-    printf "$ttt$ttt$ttt\n\n$ttt\n" > expect &&
-    printf "$ttt$ttt$ttt\n\t\n \n\n  \t\t\n$ttt\n" | git stripspace >actual &&
-    test_cmp expect actual &&
+	printf "$ttt$ttt$ttt\n\n$ttt\n" > expect &&
+	printf "$ttt$ttt$ttt\n\t\n \n\n  \t\t\n$ttt\n" | git stripspace >actual &&
+	test_cmp expect actual &&
 
-    printf "$ttt\n\n$ttt\n" > expect &&
-    printf "$ttt\n\t\n \n\n  \t\t\n$ttt\n" | git stripspace >actual &&
-    test_cmp expect actual &&
+	printf "$ttt\n\n$ttt\n" > expect &&
+	printf "$ttt\n\t\n \n\n  \t\t\n$ttt\n" | git stripspace >actual &&
+	test_cmp expect actual &&
 
-    printf "$ttt\n\n$ttt$ttt\n" > expect &&
-    printf "$ttt\n\t\n \n\n  \t\t\n$ttt$ttt\n" | git stripspace >actual &&
-    test_cmp expect actual &&
+	printf "$ttt\n\n$ttt$ttt\n" > expect &&
+	printf "$ttt\n\t\n \n\n  \t\t\n$ttt$ttt\n" | git stripspace >actual &&
+	test_cmp expect actual &&
 
-    printf "$ttt\n\n$ttt$ttt$ttt\n" > expect &&
-    printf "$ttt\n\t\n \n\n  \t\t\n$ttt$ttt$ttt\n" | git stripspace >actual &&
-    test_cmp expect actual
+	printf "$ttt\n\n$ttt$ttt$ttt\n" > expect &&
+	printf "$ttt\n\t\n \n\n  \t\t\n$ttt$ttt$ttt\n" | git stripspace >actual &&
+	test_cmp expect actual
 '
 
-test_expect_success \
-    'only consecutive blank lines should be completely removed' '
+test_expect_success 'only consecutive blank lines should be completely removed' '
+	printf "\n" | git stripspace >actual &&
+	test_must_be_empty actual &&
 
-    printf "\n" | git stripspace >actual &&
-    test_must_be_empty actual &&
+	printf "\n\n\n" | git stripspace >actual &&
+	test_must_be_empty actual &&
 
-    printf "\n\n\n" | git stripspace >actual &&
-    test_must_be_empty actual &&
+	printf "$sss\n$sss\n$sss\n" | git stripspace >actual &&
+	test_must_be_empty actual &&
 
-    printf "$sss\n$sss\n$sss\n" | git stripspace >actual &&
-    test_must_be_empty actual &&
+	printf "$sss$sss\n$sss\n\n" | git stripspace >actual &&
+	test_must_be_empty actual &&
 
-    printf "$sss$sss\n$sss\n\n" | git stripspace >actual &&
-    test_must_be_empty actual &&
+	printf "\n$sss\n$sss$sss\n" | git stripspace >actual &&
+	test_must_be_empty actual &&
 
-    printf "\n$sss\n$sss$sss\n" | git stripspace >actual &&
-    test_must_be_empty actual &&
+	printf "$sss$sss$sss$sss\n\n\n" | git stripspace >actual &&
+	test_must_be_empty actual &&
 
-    printf "$sss$sss$sss$sss\n\n\n" | git stripspace >actual &&
-    test_must_be_empty actual &&
+	printf "\n$sss$sss$sss$sss\n\n" | git stripspace >actual &&
+	test_must_be_empty actual &&
 
-    printf "\n$sss$sss$sss$sss\n\n" | git stripspace >actual &&
-    test_must_be_empty actual &&
-
-    printf "\n\n$sss$sss$sss$sss\n" | git stripspace >actual &&
-    test_must_be_empty actual
+	printf "\n\n$sss$sss$sss$sss\n" | git stripspace >actual &&
+	test_must_be_empty actual
 '
 
-test_expect_success \
-    'consecutive blank lines at the beginning should be removed' '
-    printf "$ttt\n" > expect &&
-    printf "\n$ttt\n" | git stripspace >actual &&
-    test_cmp expect actual &&
+test_expect_success 'consecutive blank lines at the beginning should be removed' '
+	printf "$ttt\n" > expect &&
+	printf "\n$ttt\n" | git stripspace >actual &&
+	test_cmp expect actual &&
 
-    printf "$ttt\n" > expect &&
-    printf "\n\n\n$ttt\n" | git stripspace >actual &&
-    test_cmp expect actual &&
+	printf "$ttt\n" > expect &&
+	printf "\n\n\n$ttt\n" | git stripspace >actual &&
+	test_cmp expect actual &&
 
-    printf "$ttt$ttt\n" > expect &&
-    printf "\n\n\n$ttt$ttt\n" | git stripspace >actual &&
-    test_cmp expect actual &&
+	printf "$ttt$ttt\n" > expect &&
+	printf "\n\n\n$ttt$ttt\n" | git stripspace >actual &&
+	test_cmp expect actual &&
 
-    printf "$ttt$ttt$ttt\n" > expect &&
-    printf "\n\n\n$ttt$ttt$ttt\n" | git stripspace >actual &&
-    test_cmp expect actual &&
+	printf "$ttt$ttt$ttt\n" > expect &&
+	printf "\n\n\n$ttt$ttt$ttt\n" | git stripspace >actual &&
+	test_cmp expect actual &&
 
-    printf "$ttt$ttt$ttt$ttt\n" > expect &&
-    printf "\n\n\n$ttt$ttt$ttt$ttt\n" | git stripspace >actual &&
-    test_cmp expect actual &&
+	printf "$ttt$ttt$ttt$ttt\n" > expect &&
+	printf "\n\n\n$ttt$ttt$ttt$ttt\n" | git stripspace >actual &&
+	test_cmp expect actual &&
 
-    printf "$ttt\n" > expect &&
+	printf "$ttt\n" > expect &&
 
-    printf "$sss\n$sss\n$sss\n$ttt\n" | git stripspace >actual &&
-    test_cmp expect actual &&
+	printf "$sss\n$sss\n$sss\n$ttt\n" | git stripspace >actual &&
+	test_cmp expect actual &&
 
-    printf "\n$sss\n$sss$sss\n$ttt\n" | git stripspace >actual &&
-    test_cmp expect actual &&
+	printf "\n$sss\n$sss$sss\n$ttt\n" | git stripspace >actual &&
+	test_cmp expect actual &&
 
-    printf "$sss$sss\n$sss\n\n$ttt\n" | git stripspace >actual &&
-    test_cmp expect actual &&
+	printf "$sss$sss\n$sss\n\n$ttt\n" | git stripspace >actual &&
+	test_cmp expect actual &&
 
-    printf "$sss$sss$sss\n\n\n$ttt\n" | git stripspace >actual &&
-    test_cmp expect actual &&
+	printf "$sss$sss$sss\n\n\n$ttt\n" | git stripspace >actual &&
+	test_cmp expect actual &&
 
-    printf "\n$sss$sss$sss\n\n$ttt\n" | git stripspace >actual &&
-    test_cmp expect actual &&
+	printf "\n$sss$sss$sss\n\n$ttt\n" | git stripspace >actual &&
+	test_cmp expect actual &&
 
-    printf "\n\n$sss$sss$sss\n$ttt\n" | git stripspace >actual &&
-    test_cmp expect actual
+	printf "\n\n$sss$sss$sss\n$ttt\n" | git stripspace >actual &&
+	test_cmp expect actual
 '
 
-test_expect_success \
-    'consecutive blank lines at the end should be removed' '
-    printf "$ttt\n" > expect &&
-    printf "$ttt\n\n" | git stripspace >actual &&
-    test_cmp expect actual &&
+test_expect_success 'consecutive blank lines at the end should be removed' '
+	printf "$ttt\n" > expect &&
+	printf "$ttt\n\n" | git stripspace >actual &&
+	test_cmp expect actual &&
 
-    printf "$ttt\n" > expect &&
-    printf "$ttt\n\n\n\n" | git stripspace >actual &&
-    test_cmp expect actual &&
+	printf "$ttt\n" > expect &&
+	printf "$ttt\n\n\n\n" | git stripspace >actual &&
+	test_cmp expect actual &&
 
-    printf "$ttt$ttt\n" > expect &&
-    printf "$ttt$ttt\n\n\n\n" | git stripspace >actual &&
-    test_cmp expect actual &&
+	printf "$ttt$ttt\n" > expect &&
+	printf "$ttt$ttt\n\n\n\n" | git stripspace >actual &&
+	test_cmp expect actual &&
 
-    printf "$ttt$ttt$ttt\n" > expect &&
-    printf "$ttt$ttt$ttt\n\n\n\n" | git stripspace >actual &&
-    test_cmp expect actual &&
+	printf "$ttt$ttt$ttt\n" > expect &&
+	printf "$ttt$ttt$ttt\n\n\n\n" | git stripspace >actual &&
+	test_cmp expect actual &&
 
-    printf "$ttt$ttt$ttt$ttt\n" > expect &&
-    printf "$ttt$ttt$ttt$ttt\n\n\n\n" | git stripspace >actual &&
-    test_cmp expect actual &&
+	printf "$ttt$ttt$ttt$ttt\n" > expect &&
+	printf "$ttt$ttt$ttt$ttt\n\n\n\n" | git stripspace >actual &&
+	test_cmp expect actual &&
 
-    printf "$ttt\n" > expect &&
+	printf "$ttt\n" > expect &&
 
-    printf "$ttt\n$sss\n$sss\n$sss\n" | git stripspace >actual &&
-    test_cmp expect actual &&
+	printf "$ttt\n$sss\n$sss\n$sss\n" | git stripspace >actual &&
+	test_cmp expect actual &&
 
-    printf "$ttt\n\n$sss\n$sss$sss\n" | git stripspace >actual &&
-    test_cmp expect actual &&
+	printf "$ttt\n\n$sss\n$sss$sss\n" | git stripspace >actual &&
+	test_cmp expect actual &&
 
-    printf "$ttt\n$sss$sss\n$sss\n\n" | git stripspace >actual &&
-    test_cmp expect actual &&
+	printf "$ttt\n$sss$sss\n$sss\n\n" | git stripspace >actual &&
+	test_cmp expect actual &&
 
-    printf "$ttt\n$sss$sss$sss\n\n\n" | git stripspace >actual &&
-    test_cmp expect actual &&
+	printf "$ttt\n$sss$sss$sss\n\n\n" | git stripspace >actual &&
+	test_cmp expect actual &&
 
-    printf "$ttt\n\n$sss$sss$sss\n\n" | git stripspace >actual &&
-    test_cmp expect actual &&
+	printf "$ttt\n\n$sss$sss$sss\n\n" | git stripspace >actual &&
+	test_cmp expect actual &&
 
-    printf "$ttt\n\n\n$sss$sss$sss\n" | git stripspace >actual &&
-    test_cmp expect actual
+	printf "$ttt\n\n\n$sss$sss$sss\n" | git stripspace >actual &&
+	test_cmp expect actual
 '
 
-test_expect_success \
-    'text without newline at end should end with newline' '
-    test $(printf "$ttt" | git stripspace | wc -l) -gt 0 &&
-    test $(printf "$ttt$ttt" | git stripspace | wc -l) -gt 0 &&
-    test $(printf "$ttt$ttt$ttt" | git stripspace | wc -l) -gt 0 &&
-    test $(printf "$ttt$ttt$ttt$ttt" | git stripspace | wc -l) -gt 0
+test_expect_success 'text without newline at end should end with newline' '
+	test_stdout_line_count -gt 0 printf_git_stripspace "$ttt" &&
+	test_stdout_line_count -gt 0 printf_git_stripspace "$ttt$ttt" &&
+	test_stdout_line_count -gt 0 printf_git_stripspace "$ttt$ttt$ttt" &&
+	test_stdout_line_count -gt 0 printf_git_stripspace "$ttt$ttt$ttt$ttt"
 '
 
 # text plus spaces at the end:
 
-test_expect_success \
-    'text plus spaces without newline at end should end with newline' '
-    test $(printf "$ttt$sss" | git stripspace | wc -l) -gt 0 &&
-    test $(printf "$ttt$ttt$sss" | git stripspace | wc -l) -gt 0 &&
-    test $(printf "$ttt$ttt$ttt$sss" | git stripspace | wc -l) -gt 0 &&
-    test $(printf "$ttt$sss$sss" | git stripspace | wc -l) -gt 0 &&
-    test $(printf "$ttt$ttt$sss$sss" | git stripspace | wc -l) -gt 0 &&
-    test $(printf "$ttt$sss$sss$sss" | git stripspace | wc -l) -gt 0
+test_expect_success 'text plus spaces without newline at end should end with newline' '
+	test_stdout_line_count -gt 0 printf_git_stripspace "$ttt$sss" &&
+	test_stdout_line_count -gt 0 printf_git_stripspace "$ttt$ttt$sss" &&
+	test_stdout_line_count -gt 0 printf_git_stripspace "$ttt$ttt$ttt$sss" &&
+	test_stdout_line_count -gt 0 printf_git_stripspace "$ttt$sss$sss" &&
+	test_stdout_line_count -gt 0 printf_git_stripspace "$ttt$ttt$sss$sss" &&
+	test_stdout_line_count -gt 0 printf_git_stripspace "$ttt$sss$sss$sss"
 '
 
-test_expect_success \
-    'text plus spaces without newline at end should not show spaces' '
-    ! (printf "$ttt$sss" | git stripspace | grep "  " >/dev/null) &&
-    ! (printf "$ttt$ttt$sss" | git stripspace | grep "  " >/dev/null) &&
-    ! (printf "$ttt$ttt$ttt$sss" | git stripspace | grep "  " >/dev/null) &&
-    ! (printf "$ttt$sss$sss" | git stripspace | grep "  " >/dev/null) &&
-    ! (printf "$ttt$ttt$sss$sss" | git stripspace | grep "  " >/dev/null) &&
-    ! (printf "$ttt$sss$sss$sss" | git stripspace | grep "  " >/dev/null)
+test_expect_success 'text plus spaces without newline at end should not show spaces' '
+	printf "$ttt$sss" | git stripspace >tmp &&
+	! grep "  " tmp >/dev/null &&
+	printf "$ttt$ttt$sss" | git stripspace >tmp &&
+	! grep "  " tmp >/dev/null &&
+	printf "$ttt$ttt$ttt$sss" | git stripspace >tmp &&
+	! grep "  " tmp >/dev/null &&
+	printf "$ttt$sss$sss" | git stripspace >tmp &&
+	! grep "  " tmp >/dev/null &&
+	printf "$ttt$ttt$sss$sss" | git stripspace >tmp &&
+	! grep "  " tmp >/dev/null &&
+	printf "$ttt$sss$sss$sss" | git stripspace >tmp &&
+	! grep "  " tmp >/dev/null
 '
 
-test_expect_success \
-    'text plus spaces without newline should show the correct lines' '
-    printf "$ttt\n" >expect &&
-    printf "$ttt$sss" | git stripspace >actual &&
-    test_cmp expect actual &&
+test_expect_success 'text plus spaces without newline should show the correct lines' '
+	printf "$ttt\n" >expect &&
+	printf "$ttt$sss" | git stripspace >actual &&
+	test_cmp expect actual &&
 
-    printf "$ttt\n" >expect &&
-    printf "$ttt$sss$sss" | git stripspace >actual &&
-    test_cmp expect actual &&
+	printf "$ttt\n" >expect &&
+	printf "$ttt$sss$sss" | git stripspace >actual &&
+	test_cmp expect actual &&
 
-    printf "$ttt\n" >expect &&
-    printf "$ttt$sss$sss$sss" | git stripspace >actual &&
-    test_cmp expect actual &&
+	printf "$ttt\n" >expect &&
+	printf "$ttt$sss$sss$sss" | git stripspace >actual &&
+	test_cmp expect actual &&
 
-    printf "$ttt$ttt\n" >expect &&
-    printf "$ttt$ttt$sss" | git stripspace >actual &&
-    test_cmp expect actual &&
+	printf "$ttt$ttt\n" >expect &&
+	printf "$ttt$ttt$sss" | git stripspace >actual &&
+	test_cmp expect actual &&
 
-    printf "$ttt$ttt\n" >expect &&
-    printf "$ttt$ttt$sss$sss" | git stripspace >actual &&
-    test_cmp expect actual &&
+	printf "$ttt$ttt\n" >expect &&
+	printf "$ttt$ttt$sss$sss" | git stripspace >actual &&
+	test_cmp expect actual &&
 
-    printf "$ttt$ttt$ttt\n" >expect &&
-    printf "$ttt$ttt$ttt$sss" | git stripspace >actual &&
-    test_cmp expect actual
+	printf "$ttt$ttt$ttt\n" >expect &&
+	printf "$ttt$ttt$ttt$sss" | git stripspace >actual &&
+	test_cmp expect actual
 '
 
-test_expect_success \
-    'text plus spaces at end should not show spaces' '
-    ! (echo "$ttt$sss" | git stripspace | grep "  " >/dev/null) &&
-    ! (echo "$ttt$ttt$sss" | git stripspace | grep "  " >/dev/null) &&
-    ! (echo "$ttt$ttt$ttt$sss" | git stripspace | grep "  " >/dev/null) &&
-    ! (echo "$ttt$sss$sss" | git stripspace | grep "  " >/dev/null) &&
-    ! (echo "$ttt$ttt$sss$sss" | git stripspace | grep "  " >/dev/null) &&
-    ! (echo "$ttt$sss$sss$sss" | git stripspace | grep "  " >/dev/null)
+test_expect_success 'text plus spaces at end should not show spaces' '
+	echo "$ttt$sss" | git stripspace >tmp &&
+	! grep "  " tmp >/dev/null &&
+	echo "$ttt$ttt$sss" | git stripspace >tmp &&
+	! grep "  " tmp >/dev/null &&
+	echo "$ttt$ttt$ttt$sss" | git stripspace >tmp &&
+	! grep "  " tmp >/dev/null &&
+	echo "$ttt$sss$sss" | git stripspace >tmp &&
+	! grep "  " tmp >/dev/null &&
+	echo "$ttt$ttt$sss$sss" | git stripspace >tmp &&
+	! grep "  " tmp >/dev/null &&
+	echo "$ttt$sss$sss$sss" | git stripspace >tmp &&
+	! grep "  " tmp >/dev/null
 '
 
-test_expect_success \
-    'text plus spaces at end should be cleaned and newline must remain' '
-    echo "$ttt" >expect &&
-    echo "$ttt$sss" | git stripspace >actual &&
-    test_cmp expect actual &&
+test_expect_success 'text plus spaces at end should be cleaned and newline must remain' '
+	echo "$ttt" >expect &&
+	echo "$ttt$sss" | git stripspace >actual &&
+	test_cmp expect actual &&
 
-    echo "$ttt" >expect &&
-    echo "$ttt$sss$sss" | git stripspace >actual &&
-    test_cmp expect actual &&
+	echo "$ttt" >expect &&
+	echo "$ttt$sss$sss" | git stripspace >actual &&
+	test_cmp expect actual &&
 
-    echo "$ttt" >expect &&
-    echo "$ttt$sss$sss$sss" | git stripspace >actual &&
-    test_cmp expect actual &&
+	echo "$ttt" >expect &&
+	echo "$ttt$sss$sss$sss" | git stripspace >actual &&
+	test_cmp expect actual &&
 
-    echo "$ttt$ttt" >expect &&
-    echo "$ttt$ttt$sss" | git stripspace >actual &&
-    test_cmp expect actual &&
+	echo "$ttt$ttt" >expect &&
+	echo "$ttt$ttt$sss" | git stripspace >actual &&
+	test_cmp expect actual &&
 
-    echo "$ttt$ttt" >expect &&
-    echo "$ttt$ttt$sss$sss" | git stripspace >actual &&
-    test_cmp expect actual &&
+	echo "$ttt$ttt" >expect &&
+	echo "$ttt$ttt$sss$sss" | git stripspace >actual &&
+	test_cmp expect actual &&
 
-    echo "$ttt$ttt$ttt" >expect &&
-    echo "$ttt$ttt$ttt$sss" | git stripspace >actual &&
-    test_cmp expect actual
+	echo "$ttt$ttt$ttt" >expect &&
+	echo "$ttt$ttt$ttt$sss" | git stripspace >actual &&
+	test_cmp expect actual
 '
 
 # spaces only:
 
-test_expect_success \
-    'spaces with newline at end should be replaced with empty string' '
-    echo | git stripspace >actual &&
-    test_must_be_empty actual &&
+test_expect_success 'spaces with newline at end should be replaced with empty string' '
+	echo | git stripspace >actual &&
+	test_must_be_empty actual &&
 
-    echo "$sss" | git stripspace >actual &&
-    test_must_be_empty actual &&
+	echo "$sss" | git stripspace >actual &&
+	test_must_be_empty actual &&
 
-    echo "$sss$sss" | git stripspace >actual &&
-    test_must_be_empty actual &&
+	echo "$sss$sss" | git stripspace >actual &&
+	test_must_be_empty actual &&
 
-    echo "$sss$sss$sss" | git stripspace >actual &&
-    test_must_be_empty actual &&
+	echo "$sss$sss$sss" | git stripspace >actual &&
+	test_must_be_empty actual &&
 
-    echo "$sss$sss$sss$sss" | git stripspace >actual &&
-    test_must_be_empty actual
+	echo "$sss$sss$sss$sss" | git stripspace >actual &&
+	test_must_be_empty actual
 '
 
-test_expect_success \
-    'spaces without newline at end should not show spaces' '
-    ! (printf "" | git stripspace | grep " " >/dev/null) &&
-    ! (printf "$sss" | git stripspace | grep " " >/dev/null) &&
-    ! (printf "$sss$sss" | git stripspace | grep " " >/dev/null) &&
-    ! (printf "$sss$sss$sss" | git stripspace | grep " " >/dev/null) &&
-    ! (printf "$sss$sss$sss$sss" | git stripspace | grep " " >/dev/null)
+test_expect_success 'spaces without newline at end should not show spaces' '
+	printf "" | git stripspace >tmp &&
+	! grep " " tmp >/dev/null &&
+	printf "$sss" | git stripspace >tmp &&
+	! grep " " tmp >/dev/null &&
+	printf "$sss$sss" | git stripspace >tmp &&
+	! grep " " tmp >/dev/null &&
+	printf "$sss$sss$sss" | git stripspace >tmp &&
+	! grep " " tmp >/dev/null &&
+	printf "$sss$sss$sss$sss" | git stripspace >tmp &&
+	! grep " " tmp >/dev/null
 '
 
-test_expect_success \
-    'spaces without newline at end should be replaced with empty string' '
-    printf "" | git stripspace >actual &&
-    test_must_be_empty actual &&
+test_expect_success 'spaces without newline at end should be replaced with empty string' '
+	printf "" | git stripspace >actual &&
+	test_must_be_empty actual &&
 
-    printf "$sss$sss" | git stripspace >actual &&
-    test_must_be_empty actual &&
+	printf "$sss$sss" | git stripspace >actual &&
+	test_must_be_empty actual &&
 
-    printf "$sss$sss$sss" | git stripspace >actual &&
-    test_must_be_empty actual &&
+	printf "$sss$sss$sss" | git stripspace >actual &&
+	test_must_be_empty actual &&
 
-    printf "$sss$sss$sss$sss" | git stripspace >actual &&
-    test_must_be_empty actual
+	printf "$sss$sss$sss$sss" | git stripspace >actual &&
+	test_must_be_empty actual
 '
 
-test_expect_success \
-    'consecutive text lines should be unchanged' '
-    printf "$ttt$ttt\n$ttt\n" >expect &&
-    printf "$ttt$ttt\n$ttt\n" | git stripspace >actual &&
-    test_cmp expect actual &&
+test_expect_success 'consecutive text lines should be unchanged' '
+	printf "$ttt$ttt\n$ttt\n" >expect &&
+	printf "$ttt$ttt\n$ttt\n" | git stripspace >actual &&
+	test_cmp expect actual &&
 
-    printf "$ttt\n$ttt$ttt\n$ttt\n" >expect &&
-    printf "$ttt\n$ttt$ttt\n$ttt\n" | git stripspace >actual &&
-    test_cmp expect actual &&
+	printf "$ttt\n$ttt$ttt\n$ttt\n" >expect &&
+	printf "$ttt\n$ttt$ttt\n$ttt\n" | git stripspace >actual &&
+	test_cmp expect actual &&
 
-    printf "$ttt\n$ttt\n$ttt\n$ttt$ttt\n" >expect &&
-    printf "$ttt\n$ttt\n$ttt\n$ttt$ttt\n" | git stripspace >actual &&
-    test_cmp expect actual &&
+	printf "$ttt\n$ttt\n$ttt\n$ttt$ttt\n" >expect &&
+	printf "$ttt\n$ttt\n$ttt\n$ttt$ttt\n" | git stripspace >actual &&
+	test_cmp expect actual &&
 
-    printf "$ttt\n$ttt\n\n$ttt$ttt\n$ttt\n" >expect &&
-    printf "$ttt\n$ttt\n\n$ttt$ttt\n$ttt\n" | git stripspace >actual &&
-    test_cmp expect actual &&
+	printf "$ttt\n$ttt\n\n$ttt$ttt\n$ttt\n" >expect &&
+	printf "$ttt\n$ttt\n\n$ttt$ttt\n$ttt\n" | git stripspace >actual &&
+	test_cmp expect actual &&
 
-    printf "$ttt$ttt\n\n$ttt\n$ttt$ttt\n" >expect &&
-    printf "$ttt$ttt\n\n$ttt\n$ttt$ttt\n" | git stripspace >actual &&
-    test_cmp expect actual &&
+	printf "$ttt$ttt\n\n$ttt\n$ttt$ttt\n" >expect &&
+	printf "$ttt$ttt\n\n$ttt\n$ttt$ttt\n" | git stripspace >actual &&
+	test_cmp expect actual &&
 
-    printf "$ttt\n$ttt$ttt\n\n$ttt\n" >expect &&
-    printf "$ttt\n$ttt$ttt\n\n$ttt\n" | git stripspace >actual &&
-    test_cmp expect actual
+	printf "$ttt\n$ttt$ttt\n\n$ttt\n" >expect &&
+	printf "$ttt\n$ttt$ttt\n\n$ttt\n" | git stripspace >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success 'strip comments, too' '
@@ -397,6 +401,21 @@ test_expect_success 'strip comments with changed comment char' '
 	test -z "$(echo "; comment" | git -c core.commentchar=";" stripspace -s)"
 '
 
+test_expect_success 'strip comments with changed comment string' '
+	test ! -z "$(echo "// comment" | git -c core.commentchar=// stripspace)" &&
+	test -z "$(echo "// comment" | git -c core.commentchar="//" stripspace -s)"
+'
+
+test_expect_success 'newline as commentchar is forbidden' '
+	test_must_fail git -c core.commentChar="$LF" stripspace -s 2>err &&
+	grep "core.commentchar cannot contain newline" err
+'
+
+test_expect_success 'empty commentchar is forbidden' '
+	test_must_fail git -c core.commentchar= stripspace -s 2>err &&
+	grep "core.commentchar must have at least one character" err
+'
+
 test_expect_success '-c with single line' '
 	printf "# foo\n" >expect &&
 	printf "foo" | git stripspace -c >actual &&
diff --git a/t/t0032-reftable-unittest.sh b/t/t0032-reftable-unittest.sh
new file mode 100755
index 0000000..471cb37
--- /dev/null
+++ b/t/t0032-reftable-unittest.sh
@@ -0,0 +1,16 @@
+#!/bin/sh
+#
+# Copyright (c) 2020 Google LLC
+#
+
+test_description='reftable unittests'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+test_expect_success 'unittests' '
+	TMPDIR=$(pwd) && export TMPDIR &&
+	test-tool reftable
+'
+
+test_done
diff --git a/t/t0033-safe-directory.sh b/t/t0033-safe-directory.sh
new file mode 100755
index 0000000..dc34968
--- /dev/null
+++ b/t/t0033-safe-directory.sh
@@ -0,0 +1,83 @@
+#!/bin/sh
+
+test_description='verify safe.directory checks'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+GIT_TEST_ASSUME_DIFFERENT_OWNER=1
+export GIT_TEST_ASSUME_DIFFERENT_OWNER
+
+expect_rejected_dir () {
+	test_must_fail git status 2>err &&
+	grep "dubious ownership" err
+}
+
+test_expect_success 'safe.directory is not set' '
+	expect_rejected_dir
+'
+
+test_expect_success 'safe.directory on the command line' '
+	git -c safe.directory="$(pwd)" status
+'
+
+test_expect_success 'safe.directory in the environment' '
+	env GIT_CONFIG_COUNT=1 \
+	    GIT_CONFIG_KEY_0="safe.directory" \
+	    GIT_CONFIG_VALUE_0="$(pwd)" \
+	    git status
+'
+
+test_expect_success 'safe.directory in GIT_CONFIG_PARAMETERS' '
+	env GIT_CONFIG_PARAMETERS="${SQ}safe.directory${SQ}=${SQ}$(pwd)${SQ}" \
+	    git status
+'
+
+test_expect_success 'ignoring safe.directory in repo config' '
+	(
+		unset GIT_TEST_ASSUME_DIFFERENT_OWNER &&
+		git config safe.directory "$(pwd)"
+	) &&
+	expect_rejected_dir
+'
+
+test_expect_success 'safe.directory does not match' '
+	git config --global safe.directory bogus &&
+	expect_rejected_dir
+'
+
+test_expect_success 'path exist as different key' '
+	git config --global foo.bar "$(pwd)" &&
+	expect_rejected_dir
+'
+
+test_expect_success 'safe.directory matches' '
+	git config --global --add safe.directory "$(pwd)" &&
+	git status
+'
+
+test_expect_success 'safe.directory matches, but is reset' '
+	git config --global --add safe.directory "" &&
+	expect_rejected_dir
+'
+
+test_expect_success 'safe.directory=*' '
+	git config --global --add safe.directory "*" &&
+	git status
+'
+
+test_expect_success 'safe.directory=*, but is reset' '
+	git config --global --add safe.directory "" &&
+	expect_rejected_dir
+'
+
+test_expect_success 'safe.directory in included file' '
+	cat >gitconfig-include <<-EOF &&
+	[safe]
+		directory = "$(pwd)"
+	EOF
+	git config --global --add include.path "$(pwd)/gitconfig-include" &&
+	git status
+'
+
+test_done
diff --git a/t/t0034-root-safe-directory.sh b/t/t0034-root-safe-directory.sh
new file mode 100755
index 0000000..ff31176
--- /dev/null
+++ b/t/t0034-root-safe-directory.sh
@@ -0,0 +1,93 @@
+#!/bin/sh
+
+test_description='verify safe.directory checks while running as root'
+
+. ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-sudo.sh
+
+if [ "$GIT_TEST_ALLOW_SUDO" != "YES" ]
+then
+	skip_all="You must set env var GIT_TEST_ALLOW_SUDO=YES in order to run this test"
+	test_done
+fi
+
+if ! test_have_prereq NOT_ROOT
+then
+	skip_all="These tests do not support running as root"
+	test_done
+fi
+
+test_lazy_prereq SUDO '
+	sudo -n id -u >u &&
+	id -u root >r &&
+	test_cmp u r &&
+	command -v git >u &&
+	sudo command -v git >r &&
+	test_cmp u r
+'
+
+if ! test_have_prereq SUDO
+then
+	skip_all="Your sudo/system configuration is either too strict or unsupported"
+	test_done
+fi
+
+test_expect_success SUDO 'setup' '
+	sudo rm -rf root &&
+	mkdir -p root/r &&
+	(
+		cd root/r &&
+		git init
+	)
+'
+
+test_expect_success SUDO 'sudo git status as original owner' '
+	(
+		cd root/r &&
+		git status &&
+		sudo git status
+	)
+'
+
+test_expect_success SUDO 'setup root owned repository' '
+	sudo mkdir -p root/p &&
+	sudo git init root/p
+'
+
+test_expect_success 'cannot access if owned by root' '
+	(
+		cd root/p &&
+		test_must_fail git status
+	)
+'
+
+test_expect_success 'can access if addressed explicitly' '
+	(
+		cd root/p &&
+		GIT_DIR=.git GIT_WORK_TREE=. git status
+	)
+'
+
+test_expect_success SUDO 'can access with sudo if root' '
+	(
+		cd root/p &&
+		sudo git status
+	)
+'
+
+test_expect_success SUDO 'can access with sudo if root by removing SUDO_UID' '
+	(
+		cd root/p &&
+		run_with_sudo <<-END
+			unset SUDO_UID &&
+			git status
+		END
+	)
+'
+
+# this MUST be always the last test
+test_expect_success SUDO 'cleanup' '
+	sudo rm -rf root
+'
+
+test_done
diff --git a/t/t0035-safe-bare-repository.sh b/t/t0035-safe-bare-repository.sh
new file mode 100755
index 0000000..d3cb2a1
--- /dev/null
+++ b/t/t0035-safe-bare-repository.sh
@@ -0,0 +1,107 @@
+#!/bin/sh
+
+test_description='verify safe.bareRepository checks'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+pwd="$(pwd)"
+
+expect_accepted_implicit () {
+	test_when_finished 'rm "$pwd/trace.perf"' &&
+	GIT_TRACE2_PERF="$pwd/trace.perf" git "$@" rev-parse --git-dir &&
+	# Note: we're intentionally only checking that the bare repo has a
+	# directory *prefix* of $pwd
+	grep -F "implicit-bare-repository:$pwd" "$pwd/trace.perf"
+}
+
+expect_accepted_explicit () {
+	test_when_finished 'rm "$pwd/trace.perf"' &&
+	GIT_DIR="$1" GIT_TRACE2_PERF="$pwd/trace.perf" git rev-parse --git-dir &&
+	! grep -F "implicit-bare-repository:$pwd" "$pwd/trace.perf"
+}
+
+expect_rejected () {
+	test_when_finished 'rm "$pwd/trace.perf"' &&
+	test_env GIT_TRACE2_PERF="$pwd/trace.perf" \
+		test_must_fail git "$@" rev-parse --git-dir 2>err &&
+	grep -F "cannot use bare repository" err &&
+	grep -F "implicit-bare-repository:$pwd" "$pwd/trace.perf"
+}
+
+test_expect_success 'setup an embedded bare repo, secondary worktree and submodule' '
+	git init outer-repo &&
+	git init --bare --initial-branch=main outer-repo/bare-repo &&
+	git -C outer-repo worktree add ../outer-secondary &&
+	test_path_is_dir outer-secondary &&
+	(
+		cd outer-repo &&
+		test_commit A &&
+		git push bare-repo +HEAD:refs/heads/main &&
+		git -c protocol.file.allow=always \
+			submodule add --name subn -- ./bare-repo subd
+	) &&
+	test_path_is_dir outer-repo/.git/worktrees/outer-secondary &&
+	test_path_is_dir outer-repo/.git/modules/subn
+'
+
+test_expect_success 'safe.bareRepository unset' '
+	test_unconfig --global safe.bareRepository &&
+	expect_accepted_implicit -C outer-repo/bare-repo
+'
+
+test_expect_success 'safe.bareRepository=all' '
+	test_config_global safe.bareRepository all &&
+	expect_accepted_implicit -C outer-repo/bare-repo
+'
+
+test_expect_success 'safe.bareRepository=explicit' '
+	test_config_global safe.bareRepository explicit &&
+	expect_rejected -C outer-repo/bare-repo
+'
+
+test_expect_success 'safe.bareRepository in the repository' '
+	# safe.bareRepository must not be "explicit", otherwise
+	# git config fails with "fatal: not in a git directory" (like
+	# safe.directory)
+	test_config -C outer-repo/bare-repo safe.bareRepository all &&
+	test_config_global safe.bareRepository explicit &&
+	expect_rejected -C outer-repo/bare-repo
+'
+
+test_expect_success 'safe.bareRepository on the command line' '
+	test_config_global safe.bareRepository explicit &&
+	expect_accepted_implicit -C outer-repo/bare-repo \
+		-c safe.bareRepository=all
+'
+
+test_expect_success 'safe.bareRepository in included file' '
+	cat >gitconfig-include <<-\EOF &&
+	[safe]
+		bareRepository = explicit
+	EOF
+	git config --global --add include.path "$(pwd)/gitconfig-include" &&
+	expect_rejected -C outer-repo/bare-repo
+'
+
+test_expect_success 'no trace when GIT_DIR is explicitly provided' '
+	expect_accepted_explicit "$pwd/outer-repo/bare-repo"
+'
+
+test_expect_success 'no trace when "bare repository" is .git' '
+	expect_accepted_implicit -C outer-repo/.git
+'
+
+test_expect_success 'no trace when "bare repository" is a subdir of .git' '
+	expect_accepted_implicit -C outer-repo/.git/objects
+'
+
+test_expect_success 'no trace in $GIT_DIR of secondary worktree' '
+	expect_accepted_implicit -C outer-repo/.git/worktrees/outer-secondary
+'
+
+test_expect_success 'no trace in $GIT_DIR of a submodule' '
+	expect_accepted_implicit -C outer-repo/.git/modules/subn
+'
+
+test_done
diff --git a/t/t0040-parse-options.sh b/t/t0040-parse-options.sh
index f8178ee..8bb2a8b 100755
--- a/t/t0040-parse-options.sh
+++ b/t/t0040-parse-options.sh
@@ -5,6 +5,7 @@
 
 test_description='our own option parser'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 cat >expect <<\EOF
@@ -12,48 +13,55 @@ usage: test-tool parse-options <options>
 
     A helper function for the parse-options API.
 
-    --yes                 get a boolean
+    --[no-]yes            get a boolean
     -D, --no-doubt        begins with 'no-'
+    --doubt               opposite of --no-doubt
     -B, --no-fear         be brave
-    -b, --boolean         increment by one
-    -4, --or4             bitwise-or boolean with ...0100
-    --neg-or4             same as --no-or4
+    -b, --[no-]boolean    increment by one
+    -4, --[no-]or4        bitwise-or boolean with ...0100
+    --[no-]neg-or4        same as --no-or4
 
-    -i, --integer <n>     get a integer
+    -i, --[no-]integer <n>
+                          get a integer
     -j <n>                get a integer, too
     -m, --magnitude <n>   get a magnitude
-    --set23               set integer to 23
+    --[no-]set23          set integer to 23
     --mode1               set integer to 1 (cmdmode option)
     --mode2               set integer to 2 (cmdmode option)
-    -L, --length <str>    get length of <str>
-    -F, --file <file>     set file to <file>
+    --[no-]mode34 (3|4)   set integer to 3 or 4 (cmdmode option)
+    -L, --[no-]length <str>
+                          get length of <str>
+    -F, --[no-]file <file>
+                          set file to <file>
 
 String options
-    -s, --string <string>
+    -s, --[no-]string <string>
                           get a string
-    --string2 <str>       get another string
-    --st <st>             get another string (pervert ordering)
+    --[no-]string2 <str>  get another string
+    --[no-]st <st>        get another string (pervert ordering)
     -o <str>              get another string
-    --list <str>          add str to list
+    --longhelp            help text of this entry
+                          spans multiple lines
+    --[no-]list <str>     add str to list
 
 Magic arguments
-    --quux                means --quux
     -NUM                  set integer to NUM
     +                     same as -b
     --ambiguous           positive ambiguity
     --no-ambiguous        negative ambiguity
 
 Standard options
-    --abbrev[=<n>]        use <n> digits to display SHA-1s
-    -v, --verbose         be verbose
-    -n, --dry-run         dry run
-    -q, --quiet           be quiet
-    --expect <string>     expected output in the variable dump
+    --[no-]abbrev[=<n>]   use <n> digits to display object names
+    -v, --[no-]verbose    be verbose
+    -n, --[no-]dry-run    dry run
+    -q, --[no-]quiet      be quiet
+    --[no-]expect <string>
+                          expected output in the variable dump
 
 Alias
-    -A, --alias-source <string>
+    -A, --[no-]alias-source <string>
                           get a string
-    -Z, --alias-target <string>
+    -Z, --[no-]alias-target <string>
                           alias of --alias-source
 
 EOF
@@ -61,7 +69,7 @@ EOF
 test_expect_success 'test help' '
 	test_must_fail test-tool parse-options -h >output 2>output.err &&
 	test_must_be_empty output.err &&
-	test_i18ncmp expect output
+	test_cmp expect output
 '
 
 mv expect expect.err
@@ -84,7 +92,7 @@ check_unknown_i18n() {
 	cat expect.err >>expect &&
 	test_must_fail test-tool parse-options $* >output 2>output.err &&
 	test_must_be_empty output &&
-	test_i18ncmp expect output.err
+	test_cmp expect output.err
 }
 
 test_expect_success 'OPT_BOOL() #1' 'check boolean: 1 --yes'
@@ -169,9 +177,61 @@ test_expect_success 'long options' '
 '
 
 test_expect_success 'missing required value' '
-	test_expect_code 129 test-tool parse-options -s &&
-	test_expect_code 129 test-tool parse-options --string &&
-	test_expect_code 129 test-tool parse-options --file
+	cat >expect <<-\EOF &&
+	error: switch `s'\'' requires a value
+	EOF
+	test_expect_code 129 test-tool parse-options -s 2>actual &&
+	test_cmp expect actual &&
+
+	cat >expect <<-\EOF &&
+	error: option `string'\'' requires a value
+	EOF
+	test_expect_code 129 test-tool parse-options --string 2>actual &&
+	test_cmp expect actual &&
+
+	cat >expect <<-\EOF &&
+	error: option `file'\'' requires a value
+	EOF
+	test_expect_code 129 test-tool parse-options --file 2>actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'superfluous value provided: boolean' '
+	cat >expect <<-\EOF &&
+	error: option `yes'\'' takes no value
+	EOF
+	test_expect_code 129 test-tool parse-options --yes=hi 2>actual &&
+	test_cmp expect actual &&
+
+	cat >expect <<-\EOF &&
+	error: option `no-yes'\'' takes no value
+	EOF
+	test_expect_code 129 test-tool parse-options --no-yes=hi 2>actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'superfluous value provided: boolean, abbreviated' '
+	cat >expect <<-\EOF &&
+	error: option `yes'\'' takes no value
+	EOF
+	test_expect_code 129 env GIT_TEST_DISALLOW_ABBREVIATED_OPTIONS=false \
+	test-tool parse-options --ye=hi 2>actual &&
+	test_cmp expect actual &&
+
+	cat >expect <<-\EOF &&
+	error: option `no-yes'\'' takes no value
+	EOF
+	test_expect_code 129 env GIT_TEST_DISALLOW_ABBREVIATED_OPTIONS=false \
+	test-tool parse-options --no-ye=hi 2>actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'superfluous value provided: cmdmode' '
+	cat >expect <<-\EOF &&
+	error: option `mode1'\'' takes no value
+	EOF
+	test_expect_code 129 test-tool parse-options --mode1=hi 2>actual &&
+	test_cmp expect actual
 '
 
 cat >expect <<\EOF
@@ -250,7 +310,7 @@ EOF
 test_expect_success 'detect possible typos' '
 	test_must_fail test-tool parse-options -boolean >output 2>output.err &&
 	test_must_be_empty output &&
-	test_i18ncmp typo.err output.err
+	test_cmp typo.err output.err
 '
 
 cat >typo.err <<\EOF
@@ -260,11 +320,7 @@ EOF
 test_expect_success 'detect possible typos' '
 	test_must_fail test-tool parse-options -ambiguous >output 2>output.err &&
 	test_must_be_empty output &&
-	test_i18ncmp typo.err output.err
-'
-
-test_expect_success 'keep some options as arguments' '
-	test-tool parse-options --expect="arg 00: --quux" --quux
+	test_cmp typo.err output.err
 '
 
 cat >expect <<\EOF
@@ -327,19 +383,41 @@ test_expect_success 'OPT_NEGBIT() works' '
 '
 
 test_expect_success 'OPT_CMDMODE() works' '
-	test-tool parse-options --expect="integer: 1" --mode1
+	test-tool parse-options --expect="integer: 1" --mode1 &&
+	test-tool parse-options --expect="integer: 3" --mode34=3
 '
 
-test_expect_success 'OPT_CMDMODE() detects incompatibility' '
+test_expect_success 'OPT_CMDMODE() detects incompatibility (1)' '
 	test_must_fail test-tool parse-options --mode1 --mode2 >output 2>output.err &&
 	test_must_be_empty output &&
-	test_i18ngrep "incompatible with --mode" output.err
+	test_grep "mode1" output.err &&
+	test_grep "mode2" output.err &&
+	test_grep "cannot be used together" output.err
 '
 
-test_expect_success 'OPT_CMDMODE() detects incompatibility with something else' '
+test_expect_success 'OPT_CMDMODE() detects incompatibility (2)' '
 	test_must_fail test-tool parse-options --set23 --mode2 >output 2>output.err &&
 	test_must_be_empty output &&
-	test_i18ngrep "incompatible with something else" output.err
+	test_grep "mode2" output.err &&
+	test_grep "set23" output.err &&
+	test_grep "cannot be used together" output.err
+'
+
+test_expect_success 'OPT_CMDMODE() detects incompatibility (3)' '
+	test_must_fail test-tool parse-options --mode2 --set23 >output 2>output.err &&
+	test_must_be_empty output &&
+	test_grep "mode2" output.err &&
+	test_grep "set23" output.err &&
+	test_grep "cannot be used together" output.err
+'
+
+test_expect_success 'OPT_CMDMODE() detects incompatibility (4)' '
+	test_must_fail test-tool parse-options --mode2 --mode34=3 \
+		>output 2>output.err &&
+	test_must_be_empty output &&
+	test_grep "mode2" output.err &&
+	test_grep "mode34.3" output.err &&
+	test_grep "cannot be used together" output.err
 '
 
 test_expect_success 'OPT_COUNTUP() with PARSE_OPT_NODASH works' '
@@ -424,4 +502,269 @@ test_expect_success '--end-of-options treats remainder as args' '
 	    --end-of-options --verbose
 '
 
+test_expect_success 'KEEP_DASHDASH works' '
+	test-tool parse-options-flags --keep-dashdash cmd --opt=1 -- --opt=2 --unknown >actual &&
+	cat >expect <<-\EOF &&
+	opt: 1
+	arg 00: --
+	arg 01: --opt=2
+	arg 02: --unknown
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'KEEP_ARGV0 works' '
+	test-tool parse-options-flags --keep-argv0 cmd arg0 --opt=3 >actual &&
+	cat >expect <<-\EOF &&
+	opt: 3
+	arg 00: cmd
+	arg 01: arg0
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'STOP_AT_NON_OPTION works' '
+	test-tool parse-options-flags --stop-at-non-option cmd --opt=4 arg0 --opt=5 --unknown >actual &&
+	cat >expect <<-\EOF &&
+	opt: 4
+	arg 00: arg0
+	arg 01: --opt=5
+	arg 02: --unknown
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'KEEP_UNKNOWN_OPT works' '
+	test-tool parse-options-flags --keep-unknown-opt cmd --unknown=1 --opt=6 -u2 >actual &&
+	cat >expect <<-\EOF &&
+	opt: 6
+	arg 00: --unknown=1
+	arg 01: -u2
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'NO_INTERNAL_HELP works for -h' '
+	test_expect_code 129 test-tool parse-options-flags --no-internal-help cmd -h 2>err &&
+	grep "^error: unknown switch \`h$SQ" err &&
+	grep "^usage: " err
+'
+
+for help_opt in help help-all
+do
+	test_expect_success "NO_INTERNAL_HELP works for --$help_opt" "
+		test_expect_code 129 test-tool parse-options-flags --no-internal-help cmd --$help_opt 2>err &&
+		grep '^error: unknown option \`'$help_opt\' err &&
+		grep '^usage: ' err
+	"
+done
+
+test_expect_success 'KEEP_UNKNOWN_OPT | NO_INTERNAL_HELP works' '
+	test-tool parse-options-flags --keep-unknown-opt --no-internal-help cmd -h --help --help-all >actual &&
+	cat >expect <<-\EOF &&
+	opt: 0
+	arg 00: -h
+	arg 01: --help
+	arg 02: --help-all
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'subcommand - no subcommand shows error and usage' '
+	test_expect_code 129 test-tool parse-subcommand cmd 2>err &&
+	grep "^error: need a subcommand" err &&
+	grep ^usage: err
+'
+
+test_expect_success 'subcommand - subcommand after -- shows error and usage' '
+	test_expect_code 129 test-tool parse-subcommand cmd -- subcmd-one 2>err &&
+	grep "^error: need a subcommand" err &&
+	grep ^usage: err
+'
+
+test_expect_success 'subcommand - subcommand after --end-of-options shows error and usage' '
+	test_expect_code 129 test-tool parse-subcommand cmd --end-of-options subcmd-one 2>err &&
+	grep "^error: need a subcommand" err &&
+	grep ^usage: err
+'
+
+test_expect_success 'subcommand - unknown subcommand shows error and usage' '
+	test_expect_code 129 test-tool parse-subcommand cmd nope 2>err &&
+	grep "^error: unknown subcommand: \`nope$SQ" err &&
+	grep ^usage: err
+'
+
+test_expect_success 'subcommand - subcommands cannot be abbreviated' '
+	test_expect_code 129 test-tool parse-subcommand cmd subcmd-o 2>err &&
+	grep "^error: unknown subcommand: \`subcmd-o$SQ$" err &&
+	grep ^usage: err
+'
+
+test_expect_success 'subcommand - no negated subcommands' '
+	test_expect_code 129 test-tool parse-subcommand cmd no-subcmd-one 2>err &&
+	grep "^error: unknown subcommand: \`no-subcmd-one$SQ" err &&
+	grep ^usage: err
+'
+
+test_expect_success 'subcommand - simple' '
+	test-tool parse-subcommand cmd subcmd-two >actual &&
+	cat >expect <<-\EOF &&
+	opt: 0
+	fn: subcmd_two
+	arg 00: subcmd-two
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'subcommand - stop parsing at the first subcommand' '
+	test-tool parse-subcommand cmd --opt=1 subcmd-two subcmd-one --opt=2 >actual &&
+	cat >expect <<-\EOF &&
+	opt: 1
+	fn: subcmd_two
+	arg 00: subcmd-two
+	arg 01: subcmd-one
+	arg 02: --opt=2
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'subcommand - KEEP_ARGV0' '
+	test-tool parse-subcommand --keep-argv0 cmd subcmd-two >actual &&
+	cat >expect <<-\EOF &&
+	opt: 0
+	fn: subcmd_two
+	arg 00: cmd
+	arg 01: subcmd-two
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'subcommand - SUBCOMMAND_OPTIONAL + subcommand not given' '
+	test-tool parse-subcommand --subcommand-optional cmd >actual &&
+	cat >expect <<-\EOF &&
+	opt: 0
+	fn: subcmd_one
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'subcommand - SUBCOMMAND_OPTIONAL + given subcommand' '
+	test-tool parse-subcommand --subcommand-optional cmd subcmd-two branch file >actual &&
+	cat >expect <<-\EOF &&
+	opt: 0
+	fn: subcmd_two
+	arg 00: subcmd-two
+	arg 01: branch
+	arg 02: file
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'subcommand - SUBCOMMAND_OPTIONAL + subcommand not given + unknown dashless args' '
+	test-tool parse-subcommand --subcommand-optional cmd branch file >actual &&
+	cat >expect <<-\EOF &&
+	opt: 0
+	fn: subcmd_one
+	arg 00: branch
+	arg 01: file
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'subcommand - SUBCOMMAND_OPTIONAL + subcommand not given + unknown option' '
+	test_expect_code 129 test-tool parse-subcommand --subcommand-optional cmd --subcommand-opt 2>err &&
+	grep "^error: unknown option" err &&
+	grep ^usage: err
+'
+
+test_expect_success 'subcommand - SUBCOMMAND_OPTIONAL | KEEP_UNKNOWN_OPT + subcommand not given + unknown option' '
+	test-tool parse-subcommand --subcommand-optional --keep-unknown-opt cmd --subcommand-opt >actual &&
+	cat >expect <<-\EOF &&
+	opt: 0
+	fn: subcmd_one
+	arg 00: --subcommand-opt
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'subcommand - SUBCOMMAND_OPTIONAL | KEEP_UNKNOWN_OPT + subcommand ignored after unknown option' '
+	test-tool parse-subcommand --subcommand-optional --keep-unknown-opt cmd --subcommand-opt subcmd-two >actual &&
+	cat >expect <<-\EOF &&
+	opt: 0
+	fn: subcmd_one
+	arg 00: --subcommand-opt
+	arg 01: subcmd-two
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'subcommand - SUBCOMMAND_OPTIONAL | KEEP_UNKNOWN_OPT + command and subcommand options cannot be mixed' '
+	test-tool parse-subcommand --subcommand-optional --keep-unknown-opt cmd --subcommand-opt branch --opt=1 >actual &&
+	cat >expect <<-\EOF &&
+	opt: 0
+	fn: subcmd_one
+	arg 00: --subcommand-opt
+	arg 01: branch
+	arg 02: --opt=1
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'subcommand - SUBCOMMAND_OPTIONAL | KEEP_UNKNOWN_OPT | KEEP_ARGV0' '
+	test-tool parse-subcommand --subcommand-optional --keep-unknown-opt --keep-argv0 cmd --subcommand-opt branch >actual &&
+	cat >expect <<-\EOF &&
+	opt: 0
+	fn: subcmd_one
+	arg 00: cmd
+	arg 01: --subcommand-opt
+	arg 02: branch
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'subcommand - SUBCOMMAND_OPTIONAL | KEEP_UNKNOWN_OPT | KEEP_DASHDASH' '
+	test-tool parse-subcommand --subcommand-optional --keep-unknown-opt --keep-dashdash cmd -- --subcommand-opt file >actual &&
+	cat >expect <<-\EOF &&
+	opt: 0
+	fn: subcmd_one
+	arg 00: --
+	arg 01: --subcommand-opt
+	arg 02: file
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'subcommand - completion helper' '
+	test-tool parse-subcommand cmd --git-completion-helper >actual &&
+	echo "subcmd-one subcmd-two --opt= --no-opt" >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'subcommands are incompatible with STOP_AT_NON_OPTION' '
+	test_must_fail test-tool parse-subcommand --stop-at-non-option cmd subcmd-one 2>err &&
+	grep ^BUG err
+'
+
+test_expect_success 'subcommands are incompatible with KEEP_UNKNOWN_OPT unless in combination with SUBCOMMAND_OPTIONAL' '
+	test_must_fail test-tool parse-subcommand --keep-unknown-opt cmd subcmd-two 2>err &&
+	grep ^BUG err
+'
+
+test_expect_success 'subcommands are incompatible with KEEP_DASHDASH unless in combination with SUBCOMMAND_OPTIONAL' '
+	test_must_fail test-tool parse-subcommand --keep-dashdash cmd subcmd-two 2>err &&
+	grep ^BUG err
+'
+
+test_expect_success 'negative magnitude' '
+	test_must_fail test-tool parse-options --magnitude -1 >out 2>err &&
+	grep "non-negative integer" err &&
+	test_must_be_empty out
+'
+
+test_expect_success 'magnitude with units but no numbers' '
+	test_must_fail test-tool parse-options --magnitude m >out 2>err &&
+	grep "non-negative integer" err &&
+	test_must_be_empty out
+'
+
 test_done
diff --git a/t/t0041-usage.sh b/t/t0041-usage.sh
index 5b927b7..1464294 100755
--- a/t/t0041-usage.sh
+++ b/t/t0041-usage.sh
@@ -2,6 +2,10 @@
 
 test_description='Test commands behavior when given invalid argument value'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup ' '
@@ -17,8 +21,8 @@ test_expect_success 'tag --contains <existent_tag>' '
 test_expect_success 'tag --contains <inexistent_tag>' '
 	test_must_fail git tag --contains "notag" >actual 2>actual.err &&
 	test_line_count = 0 actual &&
-	test_i18ngrep "error" actual.err &&
-	test_i18ngrep ! "usage" actual.err
+	test_grep "error" actual.err &&
+	test_grep ! "usage" actual.err
 '
 
 test_expect_success 'tag --no-contains <existent_tag>' '
@@ -30,31 +34,31 @@ test_expect_success 'tag --no-contains <existent_tag>' '
 test_expect_success 'tag --no-contains <inexistent_tag>' '
 	test_must_fail git tag --no-contains "notag" >actual 2>actual.err &&
 	test_line_count = 0 actual &&
-	test_i18ngrep "error" actual.err &&
-	test_i18ngrep ! "usage" actual.err
+	test_grep "error" actual.err &&
+	test_grep ! "usage" actual.err
 '
 
 test_expect_success 'tag usage error' '
 	test_must_fail git tag --noopt >actual 2>actual.err &&
 	test_line_count = 0 actual &&
-	test_i18ngrep "usage" actual.err
+	test_grep "usage" actual.err
 '
 
 test_expect_success 'branch --contains <existent_commit>' '
-	git branch --contains "master" >actual 2>actual.err &&
-	test_i18ngrep "master" actual &&
+	git branch --contains "main" >actual 2>actual.err &&
+	test_grep "main" actual &&
 	test_line_count = 0 actual.err
 '
 
 test_expect_success 'branch --contains <inexistent_commit>' '
 	test_must_fail git branch --no-contains "nocommit" >actual 2>actual.err &&
 	test_line_count = 0 actual &&
-	test_i18ngrep "error" actual.err &&
-	test_i18ngrep ! "usage" actual.err
+	test_grep "error" actual.err &&
+	test_grep ! "usage" actual.err
 '
 
 test_expect_success 'branch --no-contains <existent_commit>' '
-	git branch --no-contains "master" >actual 2>actual.err &&
+	git branch --no-contains "main" >actual 2>actual.err &&
 	test_line_count = 0 actual &&
 	test_line_count = 0 actual.err
 '
@@ -62,18 +66,18 @@ test_expect_success 'branch --no-contains <existent_commit>' '
 test_expect_success 'branch --no-contains <inexistent_commit>' '
 	test_must_fail git branch --no-contains "nocommit" >actual 2>actual.err &&
 	test_line_count = 0 actual &&
-	test_i18ngrep "error" actual.err &&
-	test_i18ngrep ! "usage" actual.err
+	test_grep "error" actual.err &&
+	test_grep ! "usage" actual.err
 '
 
 test_expect_success 'branch usage error' '
 	test_must_fail git branch --noopt >actual 2>actual.err &&
 	test_line_count = 0 actual &&
-	test_i18ngrep "usage" actual.err
+	test_grep "usage" actual.err
 '
 
 test_expect_success 'for-each-ref --contains <existent_object>' '
-	git for-each-ref --contains "master" >actual 2>actual.err &&
+	git for-each-ref --contains "main" >actual 2>actual.err &&
 	test_line_count = 2 actual &&
 	test_line_count = 0 actual.err
 '
@@ -81,12 +85,12 @@ test_expect_success 'for-each-ref --contains <existent_object>' '
 test_expect_success 'for-each-ref --contains <inexistent_object>' '
 	test_must_fail git for-each-ref --no-contains "noobject" >actual 2>actual.err &&
 	test_line_count = 0 actual &&
-	test_i18ngrep "error" actual.err &&
-	test_i18ngrep ! "usage" actual.err
+	test_grep "error" actual.err &&
+	test_grep ! "usage" actual.err
 '
 
 test_expect_success 'for-each-ref --no-contains <existent_object>' '
-	git for-each-ref --no-contains "master" >actual 2>actual.err &&
+	git for-each-ref --no-contains "main" >actual 2>actual.err &&
 	test_line_count = 0 actual &&
 	test_line_count = 0 actual.err
 '
@@ -94,14 +98,14 @@ test_expect_success 'for-each-ref --no-contains <existent_object>' '
 test_expect_success 'for-each-ref --no-contains <inexistent_object>' '
 	test_must_fail git for-each-ref --no-contains "noobject" >actual 2>actual.err &&
 	test_line_count = 0 actual &&
-	test_i18ngrep "error" actual.err &&
-	test_i18ngrep ! "usage" actual.err
+	test_grep "error" actual.err &&
+	test_grep ! "usage" actual.err
 '
 
 test_expect_success 'for-each-ref usage error' '
 	test_must_fail git for-each-ref --noopt >actual 2>actual.err &&
 	test_line_count = 0 actual &&
-	test_i18ngrep "usage" actual.err
+	test_grep "usage" actual.err
 '
 
 test_done
diff --git a/t/t0050-filesystem.sh b/t/t0050-filesystem.sh
index 608673f..325eb1c 100755
--- a/t/t0050-filesystem.sh
+++ b/t/t0050-filesystem.sh
@@ -2,6 +2,10 @@
 
 test_description='Various filesystem issues'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 auml=$(printf '\303\244')
@@ -65,7 +69,7 @@ test_expect_success "setup case tests" '
 	git mv camelcase tmp &&
 	git mv tmp CamelCase &&
 	git commit -m "rename" &&
-	git checkout -f master
+	git checkout -f main
 '
 
 test_expect_success 'rename (case change)' '
@@ -101,7 +105,8 @@ test_expect_failure CASE_INSENSITIVE_FS 'add (with different case)' '
 	rm camelcase &&
 	echo 1 >CamelCase &&
 	git add CamelCase &&
-	camel=$(git ls-files | grep -i camelcase) &&
+	git ls-files >tmp &&
+	camel=$(grep -i camelcase tmp) &&
 	test $(echo "$camel" | wc -l) = 1 &&
 	test "z$(git cat-file blob :$camel)" = z1
 '
@@ -118,7 +123,7 @@ test_expect_success "setup unicode normalization tests" '
 	git mv $aumlcdiar tmp &&
 	git mv tmp "$auml" &&
 	git commit -m rename &&
-	git checkout -f master
+	git checkout -f main
 '
 
 $test_unicode 'rename (silent unicode normalization)' '
@@ -147,7 +152,7 @@ test_expect_success CASE_INSENSITIVE_FS 'checkout with no pathspec and a case in
 		git add gitweb &&
 		git commit -m "add gitweb/subdir/file" &&
 
-		git checkout master
+		git checkout main
 	)
 '
 
diff --git a/t/t0051-windows-named-pipe.sh b/t/t0051-windows-named-pipe.sh
index 10ac92d..412f413 100755
--- a/t/t0051-windows-named-pipe.sh
+++ b/t/t0051-windows-named-pipe.sh
@@ -3,8 +3,13 @@
 test_description='Windows named pipes'
 
 . ./test-lib.sh
+if ! test_have_prereq MINGW
+then
+	skip_all='skipping Windows-specific tests'
+	test_done
+fi
 
-test_expect_success MINGW 'o_append write to named pipe' '
+test_expect_success 'o_append write to named pipe' '
 	GIT_TRACE="$(pwd)/expect" git status >/dev/null 2>&1 &&
 	{ test-tool windows-named-pipe t0051 >actual 2>&1 & } &&
 	pid=$! &&
diff --git a/t/t0052-simple-ipc.sh b/t/t0052-simple-ipc.sh
new file mode 100755
index 0000000..1a36a53
--- /dev/null
+++ b/t/t0052-simple-ipc.sh
@@ -0,0 +1,123 @@
+#!/bin/sh
+
+test_description='simple command server'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+test-tool simple-ipc SUPPORTS_SIMPLE_IPC || {
+	skip_all='simple IPC not supported on this platform'
+	test_done
+}
+
+stop_simple_IPC_server () {
+	test-tool simple-ipc stop-daemon
+}
+
+test_expect_success 'start simple command server' '
+	test_atexit stop_simple_IPC_server &&
+	test-tool simple-ipc start-daemon --threads=8 &&
+	test-tool simple-ipc is-active
+'
+
+test_expect_success 'simple command server' '
+	test-tool simple-ipc send --token=ping >actual &&
+	echo pong >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'servers cannot share the same path' '
+	test_must_fail test-tool simple-ipc run-daemon &&
+	test-tool simple-ipc is-active
+'
+
+test_expect_success 'big response' '
+	test-tool simple-ipc send --token=big >actual &&
+	test_line_count -ge 10000 actual &&
+	grep -q "big: [0]*9999\$" actual
+'
+
+test_expect_success 'chunk response' '
+	test-tool simple-ipc send --token=chunk >actual &&
+	test_line_count -ge 10000 actual &&
+	grep -q "big: [0]*9999\$" actual
+'
+
+test_expect_success 'slow response' '
+	test-tool simple-ipc send --token=slow >actual &&
+	test_line_count -ge 100 actual &&
+	grep -q "big: [0]*99\$" actual
+'
+
+# Send an IPC with n=100,000 bytes of ballast.  This should be large enough
+# to force both the kernel and the pkt-line layer to chunk the message to the
+# daemon and for the daemon to receive it in chunks.
+#
+test_expect_success 'sendbytes' '
+	test-tool simple-ipc sendbytes --bytecount=100000 --byte=A >actual &&
+	grep "sent:A00100000 rcvd:A00100000" actual
+'
+
+# Start a series of <threads> client threads that each make <batchsize>
+# IPC requests to the server.  Each (<threads> * <batchsize>) request
+# will open a new connection to the server and randomly bind to a server
+# thread.  Each client thread exits after completing its batch.  So the
+# total number of live client threads will be smaller than the total.
+# Each request will send a message containing at least <bytecount> bytes
+# of ballast.  (Responses are small.)
+#
+# The purpose here is to test threading in the server and responding to
+# many concurrent client requests (regardless of whether they come from
+# 1 client process or many).  And to test that the server side of the
+# named pipe/socket is stable.  (On Windows this means that the server
+# pipe is properly recycled.)
+#
+# On Windows it also lets us adjust the connection timeout in the
+# `ipc_client_send_command()`.
+#
+# Note it is easy to drive the system into failure by requesting an
+# insane number of threads on client or server and/or increasing the
+# per-thread batchsize or the per-request bytecount (ballast).
+# On Windows these failures look like "pipe is busy" errors.
+# So I've chosen fairly conservative values for now.
+#
+# We expect output of the form "sent:<letter><length> ..."
+# With terms (7, 19, 13) we expect:
+#   <letter> in [A-G]
+#   <length> in [19+0 .. 19+(13-1)]
+# and (7 * 13) successful responses.
+#
+test_expect_success 'stress test threads' '
+	test-tool simple-ipc multiple \
+		--threads=7 \
+		--bytecount=19 \
+		--batchsize=13 \
+		>actual &&
+	test_line_count = 92 actual &&
+	grep "good 91" actual &&
+	grep "sent:A" <actual >actual_a &&
+	cat >expect_a <<-EOF &&
+		sent:A00000019 rcvd:A00000019
+		sent:A00000020 rcvd:A00000020
+		sent:A00000021 rcvd:A00000021
+		sent:A00000022 rcvd:A00000022
+		sent:A00000023 rcvd:A00000023
+		sent:A00000024 rcvd:A00000024
+		sent:A00000025 rcvd:A00000025
+		sent:A00000026 rcvd:A00000026
+		sent:A00000027 rcvd:A00000027
+		sent:A00000028 rcvd:A00000028
+		sent:A00000029 rcvd:A00000029
+		sent:A00000030 rcvd:A00000030
+		sent:A00000031 rcvd:A00000031
+	EOF
+	test_cmp expect_a actual_a
+'
+
+test_expect_success 'stop-daemon works' '
+	test-tool simple-ipc stop-daemon &&
+	test_must_fail test-tool simple-ipc is-active &&
+	test_must_fail test-tool simple-ipc send --token=ping
+'
+
+test_done
diff --git a/t/t0055-beyond-symlinks.sh b/t/t0055-beyond-symlinks.sh
index 0c6ff56..c3eb115 100755
--- a/t/t0055-beyond-symlinks.sh
+++ b/t/t0055-beyond-symlinks.sh
@@ -2,6 +2,7 @@
 
 test_description='update-index and add refuse to add beyond symlinks'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success SYMLINKS setup '
@@ -14,12 +15,22 @@ test_expect_success SYMLINKS setup '
 
 test_expect_success SYMLINKS 'update-index --add beyond symlinks' '
 	test_must_fail git update-index --add c/d &&
-	! ( git ls-files | grep c/d )
+	cat >expect <<-\EOF &&
+	a
+	b/d
+	EOF
+	git ls-files >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success SYMLINKS 'add beyond symlinks' '
 	test_must_fail git add c/d &&
-	! ( git ls-files | grep c/d )
+	cat >expect <<-\EOF &&
+	a
+	b/d
+	EOF
+	git ls-files >actual &&
+	test_cmp expect actual
 '
 
 test_done
diff --git a/t/t0056-git-C.sh b/t/t0056-git-C.sh
index 2630e75..752aa8c 100755
--- a/t/t0056-git-C.sh
+++ b/t/t0056-git-C.sh
@@ -2,6 +2,7 @@
 
 test_description='"-C <path>" option and its effects on other path-related options'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success '"git -C <path>" runs git from the directory <path>' '
diff --git a/t/t0060-path-utils.sh b/t/t0060-path-utils.sh
index 56db5c8..0afa3d0 100755
--- a/t/t0060-path-utils.sh
+++ b/t/t0060-path-utils.sh
@@ -5,24 +5,32 @@
 
 test_description='Test various path utilities'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 norm_path() {
 	expected=$(test-tool path-utils print_path "$2")
-	test_expect_success $3 "normalize path: $1 => $2" \
-	"test \"\$(test-tool path-utils normalize_path_copy '$1')\" = '$expected'"
+	test_expect_success $3 "normalize path: $1 => $2" "
+		echo '$expected' >expect &&
+		test-tool path-utils normalize_path_copy '$1' >actual &&
+		test_cmp expect actual
+	"
 }
 
 relative_path() {
 	expected=$(test-tool path-utils print_path "$3")
-	test_expect_success $4 "relative path: $1 $2 => $3" \
-	"test \"\$(test-tool path-utils relative_path '$1' '$2')\" = '$expected'"
+	test_expect_success $4 "relative path: $1 $2 => $3" "
+		echo '$expected' >expect &&
+		test-tool path-utils relative_path '$1' '$2' >actual &&
+		test_cmp expect actual
+	"
 }
 
 test_submodule_relative_url() {
 	test_expect_success "test_submodule_relative_url: $1 $2 $3 => $4" "
-		actual=\$(git submodule--helper resolve-relative-url-test '$1' '$2' '$3') &&
-		test \"\$actual\" = '$4'
+		echo '$4' >expect &&
+		test-tool submodule resolve-relative-url '$1' '$2' '$3' >actual &&
+		test_cmp expect actual
 	"
 }
 
@@ -55,14 +63,19 @@ fi
 ancestor() {
 	# We do some math with the expected ancestor length.
 	expected=$3
-	if test -n "$rootoff" && test "x$expected" != x-1; then
-		expected=$(($expected-$rootslash))
-		test $expected -lt 0 ||
-		expected=$(($expected+$rootoff))
-	fi
-	test_expect_success "longest ancestor: $1 $2 => $expected" \
-	"actual=\$(test-tool path-utils longest_ancestor_length '$1' '$2') &&
-	 test \"\$actual\" = '$expected'"
+	case "$rootoff,$expected,$2" in
+	*,*,//*) ;; # leave UNC paths alone
+	[0-9]*,[0-9]*,/*)
+		# On Windows, expect MSYS2 pseudo root translation for
+		# Unix-style absolute paths
+		expected=$(($expected-$rootslash+$rootoff))
+		;;
+	esac
+	test_expect_success $4 "longest ancestor: $1 $2 => $expected" "
+		echo '$expected' >expect &&
+		test-tool path-utils longest_ancestor_length '$1' '$2' >actual &&
+		test_cmp expect actual
+	"
 }
 
 # Some absolute path tests should be skipped on Windows due to path mangling
@@ -156,9 +169,16 @@ ancestor /foo/bar /foo 4
 ancestor /foo/bar /foo:/bar 4
 ancestor /foo/bar /bar -1
 
+# Windows-specific: DOS drives, network shares
+ancestor C:/Users/me C:/ 2 MINGW
+ancestor D:/Users/me C:/ -1 MINGW
+ancestor //server/share/my-directory //server/share/ 14 MINGW
+
 test_expect_success 'strip_path_suffix' '
-	test c:/msysgit = $(test-tool path-utils strip_path_suffix \
-		c:/msysgit/libexec//git-core libexec/git-core)
+	echo c:/msysgit >expect &&
+	test-tool path-utils strip_path_suffix \
+		c:/msysgit/libexec//git-core libexec/git-core >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success 'absolute path rejects the empty string' '
@@ -179,35 +199,61 @@ test_expect_success 'real path rejects the empty string' '
 '
 
 test_expect_success POSIX 'real path works on absolute paths 1' '
+	echo / >expect &&
+	test-tool path-utils real_path "/" >actual &&
+	test_cmp expect actual &&
+
 	nopath="hopefully-absent-path" &&
-	test "/" = "$(test-tool path-utils real_path "/")" &&
-	test "/$nopath" = "$(test-tool path-utils real_path "/$nopath")"
+	echo "/$nopath" >expect &&
+	test-tool path-utils real_path "/$nopath" >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success 'real path works on absolute paths 2' '
-	nopath="hopefully-absent-path" &&
 	# Find an existing top-level directory for the remaining tests:
 	d=$(pwd -P | sed -e "s|^\([^/]*/[^/]*\)/.*|\1|") &&
-	test "$d" = "$(test-tool path-utils real_path "$d")" &&
-	test "$d/$nopath" = "$(test-tool path-utils real_path "$d/$nopath")"
+	echo "$d" >expect &&
+	test-tool path-utils real_path "$d" >actual &&
+	test_cmp expect actual &&
+
+	nopath="hopefully-absent-path" &&
+	echo "$d/$nopath" >expect &&
+	test-tool path-utils real_path "$d/$nopath" >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success POSIX 'real path removes extra leading slashes' '
+	echo "/" >expect &&
+	test-tool path-utils real_path "///" >actual &&
+	test_cmp expect actual &&
+
 	nopath="hopefully-absent-path" &&
-	test "/" = "$(test-tool path-utils real_path "///")" &&
-	test "/$nopath" = "$(test-tool path-utils real_path "///$nopath")" &&
+	echo "/$nopath" >expect &&
+	test-tool path-utils real_path "///$nopath" >actual &&
+	test_cmp expect actual &&
+
 	# Find an existing top-level directory for the remaining tests:
 	d=$(pwd -P | sed -e "s|^\([^/]*/[^/]*\)/.*|\1|") &&
-	test "$d" = "$(test-tool path-utils real_path "//$d")" &&
-	test "$d/$nopath" = "$(test-tool path-utils real_path "//$d/$nopath")"
+	echo "$d" >expect &&
+	test-tool path-utils real_path "//$d" >actual &&
+	test_cmp expect actual &&
+
+	echo "$d/$nopath" >expect &&
+	test-tool path-utils real_path "//$d/$nopath" >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success 'real path removes other extra slashes' '
-	nopath="hopefully-absent-path" &&
 	# Find an existing top-level directory for the remaining tests:
 	d=$(pwd -P | sed -e "s|^\([^/]*/[^/]*\)/.*|\1|") &&
-	test "$d" = "$(test-tool path-utils real_path "$d///")" &&
-	test "$d/$nopath" = "$(test-tool path-utils real_path "$d///$nopath")"
+	echo "$d" >expect &&
+	test-tool path-utils real_path "$d///" >actual &&
+	test_cmp expect actual &&
+
+	nopath="hopefully-absent-path" &&
+	echo "$d/$nopath" >expect &&
+	test-tool path-utils real_path "$d///$nopath" >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success SYMLINKS 'real path works on symlinks' '
@@ -216,21 +262,31 @@ test_expect_success SYMLINKS 'real path works on symlinks' '
 	mkdir second &&
 	ln -s ../first second/other &&
 	mkdir third &&
-	dir="$(cd .git; pwd -P)" &&
+	dir="$(cd .git && pwd -P)" &&
 	dir2=third/../second/other/.git &&
-	test "$dir" = "$(test-tool path-utils real_path $dir2)" &&
+	echo "$dir" >expect &&
+	test-tool path-utils real_path $dir2 >actual &&
+	test_cmp expect actual &&
 	file="$dir"/index &&
-	test "$file" = "$(test-tool path-utils real_path $dir2/index)" &&
+	echo "$file" >expect &&
+	test-tool path-utils real_path $dir2/index >actual &&
+	test_cmp expect actual &&
 	basename=blub &&
-	test "$dir/$basename" = "$(cd .git && test-tool path-utils real_path "$basename")" &&
+	echo "$dir/$basename" >expect &&
+	test-tool -C .git path-utils real_path "$basename" >actual &&
+	test_cmp expect actual &&
 	ln -s ../first/file .git/syml &&
-	sym="$(cd first; pwd -P)"/file &&
-	test "$sym" = "$(test-tool path-utils real_path "$dir2/syml")"
+	sym="$(cd first && pwd -P)"/file &&
+	echo "$sym" >expect &&
+	test-tool path-utils real_path "$dir2/syml" >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success SYMLINKS 'prefix_path works with absolute paths to work tree symlinks' '
 	ln -s target symlink &&
-	test "$(test-tool path-utils prefix_path prefix "$(pwd)/symlink")" = "symlink"
+	echo "symlink" >expect &&
+	test-tool path-utils prefix_path prefix "$(pwd)/symlink" >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success 'prefix_path works with only absolute path to work tree' '
@@ -246,7 +302,10 @@ test_expect_success 'prefix_path rejects absolute path to dir with same beginnin
 test_expect_success SYMLINKS 'prefix_path works with absolute path to a symlink to work tree having  same beginning as work tree' '
 	git init repo &&
 	ln -s repo repolink &&
-	test "a" = "$(cd repo && test-tool path-utils prefix_path prefix "$(pwd)/../repolink/a")"
+	echo "a" >expect &&
+	repo_path="$(cd repo && pwd)" &&
+	test-tool -C repo path-utils prefix_path prefix "$repo_path/../repolink/a" >actual &&
+	test_cmp expect actual
 '
 
 relative_path /foo/a/b/c/	/foo/a/b/	c/
@@ -312,8 +371,8 @@ test_git_path GIT_COMMON_DIR=bar info/sparse-checkout     .git/info/sparse-check
 test_git_path GIT_COMMON_DIR=bar info//sparse-checkout    .git/info//sparse-checkout
 test_git_path GIT_COMMON_DIR=bar remotes/bar              bar/remotes/bar
 test_git_path GIT_COMMON_DIR=bar branches/bar             bar/branches/bar
-test_git_path GIT_COMMON_DIR=bar logs/refs/heads/master   bar/logs/refs/heads/master
-test_git_path GIT_COMMON_DIR=bar refs/heads/master        bar/refs/heads/master
+test_git_path GIT_COMMON_DIR=bar logs/refs/heads/main     bar/logs/refs/heads/main
+test_git_path GIT_COMMON_DIR=bar refs/heads/main          bar/refs/heads/main
 test_git_path GIT_COMMON_DIR=bar refs/bisect/foo          .git/refs/bisect/foo
 test_git_path GIT_COMMON_DIR=bar hooks/me                 bar/hooks/me
 test_git_path GIT_COMMON_DIR=bar config                   bar/config
@@ -468,6 +527,36 @@ test_expect_success 'match .gitmodules' '
 		.gitmodules,:\$DATA
 '
 
+test_expect_success 'match .gitattributes' '
+	test-tool path-utils is_dotgitattributes \
+		.gitattributes \
+		.git${u200c}attributes \
+		.Gitattributes \
+		.gitattributeS \
+		GITATT~1 \
+		GI7D29~1
+'
+
+test_expect_success 'match .gitignore' '
+	test-tool path-utils is_dotgitignore \
+		.gitignore \
+		.git${u200c}ignore \
+		.Gitignore \
+		.gitignorE \
+		GITIGN~1 \
+		GI250A~1
+'
+
+test_expect_success 'match .mailmap' '
+	test-tool path-utils is_dotmailmap \
+		.mailmap \
+		.mail${u200c}map \
+		.Mailmap \
+		.mailmaP \
+		MAILMA~1 \
+		MABA30~1
+'
+
 test_expect_success MINGW 'is_valid_path() on Windows' '
 	test-tool path-utils is_valid_path \
 		win32 \
@@ -495,4 +584,30 @@ test_expect_success MINGW 'is_valid_path() on Windows' '
 		"PRN./abc"
 '
 
+test_lazy_prereq RUNTIME_PREFIX '
+	test true = "$RUNTIME_PREFIX"
+'
+
+test_lazy_prereq CAN_EXEC_IN_PWD '
+	cp "$GIT_EXEC_PATH"/git$X ./ &&
+	./git rev-parse
+'
+
+test_expect_success !VALGRIND,RUNTIME_PREFIX,CAN_EXEC_IN_PWD 'RUNTIME_PREFIX works' '
+	mkdir -p pretend/bin pretend/libexec/git-core &&
+	echo "echo HERE" | write_script pretend/libexec/git-core/git-here &&
+	cp "$GIT_EXEC_PATH"/git$X pretend/bin/ &&
+	GIT_EXEC_PATH= ./pretend/bin/git here >actual &&
+	echo HERE >expect &&
+	test_cmp expect actual'
+
+test_expect_success !VALGRIND,RUNTIME_PREFIX,CAN_EXEC_IN_PWD '%(prefix)/ works' '
+	mkdir -p pretend/bin &&
+	cp "$GIT_EXEC_PATH"/git$X pretend/bin/ &&
+	git config yes.path "%(prefix)/yes" &&
+	GIT_EXEC_PATH= ./pretend/bin/git config --path yes.path >actual &&
+	echo "$(pwd)/pretend/yes" >expect &&
+	test_cmp expect actual
+'
+
 test_done
diff --git a/t/t0061-run-command.sh b/t/t0061-run-command.sh
index 7d59967..20986b6 100755
--- a/t/t0061-run-command.sh
+++ b/t/t0061-run-command.sh
@@ -5,6 +5,7 @@
 
 test_description='Test run command'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 cat >hello-script <<-EOF
@@ -18,12 +19,12 @@ test_expect_success MINGW 'subprocess inherits only std handles' '
 
 test_expect_success 'start_command reports ENOENT (slash)' '
 	test-tool run-command start-command-ENOENT ./does-not-exist 2>err &&
-	test_i18ngrep "\./does-not-exist" err
+	test_grep "\./does-not-exist" err
 '
 
 test_expect_success 'start_command reports ENOENT (no slash)' '
 	test-tool run-command start-command-ENOENT does-not-exist 2>err &&
-	test_i18ngrep "does-not-exist" err
+	test_grep "does-not-exist" err
 '
 
 test_expect_success 'run_command can run a command' '
@@ -48,7 +49,7 @@ test_expect_success !RUNS_COMMANDS_FROM_PWD 'run_command is restricted to PATH'
 	echo yikes
 	EOF
 	test_must_fail test-tool run-command run-command should-not-run 2>err &&
-	test_i18ngrep "should-not-run" err
+	test_grep "should-not-run" err
 '
 
 test_expect_success !MINGW 'run_command can run a script without a #! line' '
@@ -129,20 +130,41 @@ World
 EOF
 
 test_expect_success 'run_command runs in parallel with more jobs available than tasks' '
-	test-tool run-command run-command-parallel 5 sh -c "printf \"%s\n%s\n\" Hello World" 2>actual &&
+	test-tool run-command run-command-parallel 5 sh -c "printf \"%s\n%s\n\" Hello World" >out 2>actual &&
+	test_must_be_empty out &&
 	test_cmp expect actual
 '
 
+test_expect_success 'run_command runs ungrouped in parallel with more jobs available than tasks' '
+	test-tool run-command --ungroup run-command-parallel 5 sh -c "printf \"%s\n%s\n\" Hello World" >out 2>err &&
+	test_line_count = 8 out &&
+	test_line_count = 4 err
+'
+
 test_expect_success 'run_command runs in parallel with as many jobs as tasks' '
-	test-tool run-command run-command-parallel 4 sh -c "printf \"%s\n%s\n\" Hello World" 2>actual &&
+	test-tool run-command run-command-parallel 4 sh -c "printf \"%s\n%s\n\" Hello World" >out 2>actual &&
+	test_must_be_empty out &&
 	test_cmp expect actual
 '
 
+test_expect_success 'run_command runs ungrouped in parallel with as many jobs as tasks' '
+	test-tool run-command --ungroup run-command-parallel 4 sh -c "printf \"%s\n%s\n\" Hello World" >out 2>err &&
+	test_line_count = 8 out &&
+	test_line_count = 4 err
+'
+
 test_expect_success 'run_command runs in parallel with more tasks than jobs available' '
-	test-tool run-command run-command-parallel 3 sh -c "printf \"%s\n%s\n\" Hello World" 2>actual &&
+	test-tool run-command run-command-parallel 3 sh -c "printf \"%s\n%s\n\" Hello World" >out 2>actual &&
+	test_must_be_empty out &&
 	test_cmp expect actual
 '
 
+test_expect_success 'run_command runs ungrouped in parallel with more tasks than jobs available' '
+	test-tool run-command --ungroup run-command-parallel 3 sh -c "printf \"%s\n%s\n\" Hello World" >out 2>err &&
+	test_line_count = 8 out &&
+	test_line_count = 4 err
+'
+
 cat >expect <<-EOF
 preloaded output of a child
 asking for a quick stop
@@ -153,19 +175,33 @@ asking for a quick stop
 EOF
 
 test_expect_success 'run_command is asked to abort gracefully' '
-	test-tool run-command run-command-abort 3 false 2>actual &&
+	test-tool run-command run-command-abort 3 false >out 2>actual &&
+	test_must_be_empty out &&
 	test_cmp expect actual
 '
 
+test_expect_success 'run_command is asked to abort gracefully (ungroup)' '
+	test-tool run-command --ungroup run-command-abort 3 false >out 2>err &&
+	test_must_be_empty out &&
+	test_line_count = 6 err
+'
+
 cat >expect <<-EOF
 no further jobs available
 EOF
 
 test_expect_success 'run_command outputs ' '
-	test-tool run-command run-command-no-jobs 3 sh -c "printf \"%s\n%s\n\" Hello World" 2>actual &&
+	test-tool run-command run-command-no-jobs 3 sh -c "printf \"%s\n%s\n\" Hello World" >out 2>actual &&
+	test_must_be_empty out &&
 	test_cmp expect actual
 '
 
+test_expect_success 'run_command outputs (ungroup) ' '
+	test-tool run-command --ungroup run-command-no-jobs 3 sh -c "printf \"%s\n%s\n\" Hello World" >out 2>err &&
+	test_must_be_empty out &&
+	test_cmp expect err
+'
+
 test_trace () {
 	expect="$1"
 	shift
diff --git a/t/t0062-revision-walking.sh b/t/t0062-revision-walking.sh
index 8e21586..b9480c8 100755
--- a/t/t0062-revision-walking.sh
+++ b/t/t0062-revision-walking.sh
@@ -5,6 +5,7 @@
 
 test_description='Test revision walking api'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 cat >run_twice_expected <<-EOF
diff --git a/t/t0063-string-list.sh b/t/t0063-string-list.sh
index c6ee9f6..1fee6d9 100755
--- a/t/t0063-string-list.sh
+++ b/t/t0063-string-list.sh
@@ -5,6 +5,7 @@
 
 test_description='Test string list functionality'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_split () {
@@ -17,6 +18,14 @@ test_split () {
 	"
 }
 
+test_split_in_place() {
+	cat >expected &&
+	test_expect_success "split (in place) $1 at $2, max $3" "
+		test-tool string-list split_in_place '$1' '$2' '$3' >actual &&
+		test_cmp expected actual
+	"
+}
+
 test_split "foo:bar:baz" ":" "-1" <<EOF
 3
 [0]: "foo"
@@ -60,6 +69,49 @@ test_split ":" ":" "-1" <<EOF
 [1]: ""
 EOF
 
+test_split_in_place "foo:;:bar:;:baz:;:" ":;" "-1" <<EOF
+10
+[0]: "foo"
+[1]: ""
+[2]: ""
+[3]: "bar"
+[4]: ""
+[5]: ""
+[6]: "baz"
+[7]: ""
+[8]: ""
+[9]: ""
+EOF
+
+test_split_in_place "foo:;:bar:;:baz" ":;" "0" <<EOF
+1
+[0]: "foo:;:bar:;:baz"
+EOF
+
+test_split_in_place "foo:;:bar:;:baz" ":;" "1" <<EOF
+2
+[0]: "foo"
+[1]: ";:bar:;:baz"
+EOF
+
+test_split_in_place "foo:;:bar:;:baz" ":;" "2" <<EOF
+3
+[0]: "foo"
+[1]: ""
+[2]: ":bar:;:baz"
+EOF
+
+test_split_in_place "foo:;:bar:;:" ":;" "-1" <<EOF
+7
+[0]: "foo"
+[1]: ""
+[2]: ""
+[3]: "bar"
+[4]: ""
+[5]: ""
+[6]: ""
+EOF
+
 test_expect_success "test filter_string_list" '
 	test "x-" = "x$(test-tool string-list filter - y)" &&
 	test "x-" = "x$(test-tool string-list filter no y)" &&
diff --git a/t/t0064-sha1-array.sh b/t/t0064-oid-array.sh
index 45685af..88c89e8 100755
--- a/t/t0064-sha1-array.sh
+++ b/t/t0064-oid-array.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
-test_description='basic tests for the SHA1 array implementation'
+test_description='basic tests for the oid array implementation'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 echoid () {
@@ -27,6 +29,7 @@ test_expect_success 'ordered enumeration with duplicate suppression' '
 	{
 		echoid append 88 44 aa 55 &&
 		echoid append 88 44 aa 55 &&
+		echoid append 88 44 aa 55 &&
 		echo for_each_unique
 	} | test-tool oid-array >actual &&
 	test_cmp expect actual
@@ -54,17 +57,19 @@ test_expect_success 'lookup with duplicates' '
 	{
 		echoid append 88 44 aa 55 &&
 		echoid append 88 44 aa 55 &&
+		echoid append 88 44 aa 55 &&
 		echoid lookup 55
 	} | test-tool oid-array >actual &&
 	n=$(cat actual) &&
-	test "$n" -ge 2 &&
-	test "$n" -le 3
+	test "$n" -ge 3 &&
+	test "$n" -le 5
 '
 
 test_expect_success 'lookup non-existing entry with duplicates' '
 	{
 		echoid append 88 44 aa 55 &&
 		echoid append 88 44 aa 55 &&
+		echoid append 88 44 aa 55 &&
 		echoid lookup 66
 	} | test-tool oid-array >actual &&
 	n=$(cat actual) &&
diff --git a/t/t0065-strcmp-offset.sh b/t/t0065-strcmp-offset.sh
index 91fa639..94e34c8 100755
--- a/t/t0065-strcmp-offset.sh
+++ b/t/t0065-strcmp-offset.sh
@@ -2,6 +2,7 @@
 
 test_description='Test strcmp_offset functionality'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 while read s1 s2 expect
diff --git a/t/t0066-dir-iterator.sh b/t/t0066-dir-iterator.sh
index 92910e4..7d0a0da 100755
--- a/t/t0066-dir-iterator.sh
+++ b/t/t0066-dir-iterator.sh
@@ -2,6 +2,7 @@
 
 test_description='Test the dir-iterator functionality'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -105,11 +106,7 @@ test_expect_success SYMLINKS 'setup dirs with symlinks' '
 	ln -s d dir4/a/e &&
 	ln -s ../b dir4/a/f &&
 
-	mkdir -p dir5/a/b &&
-	mkdir -p dir5/a/c &&
-	ln -s ../c dir5/a/b/d &&
-	ln -s ../ dir5/a/b/e &&
-	ln -s ../../ dir5/a/b/f
+	ln -s dir4 dir5
 '
 
 test_expect_success SYMLINKS 'dir-iterator should not follow symlinks by default' '
@@ -128,21 +125,10 @@ test_expect_success SYMLINKS 'dir-iterator should not follow symlinks by default
 	test_cmp expected-no-follow-sorted-output actual-no-follow-sorted-output
 '
 
-test_expect_success SYMLINKS 'dir-iterator should follow symlinks w/ follow flag' '
-	cat >expected-follow-sorted-output <<-EOF &&
-	[d] (a) [a] ./dir4/a
-	[d] (a/f) [f] ./dir4/a/f
-	[d] (a/f/c) [c] ./dir4/a/f/c
-	[d] (b) [b] ./dir4/b
-	[d] (b/c) [c] ./dir4/b/c
-	[f] (a/d) [d] ./dir4/a/d
-	[f] (a/e) [e] ./dir4/a/e
-	EOF
-
-	test-tool dir-iterator --follow-symlinks ./dir4 >out &&
-	sort out >actual-follow-sorted-output &&
+test_expect_success SYMLINKS 'dir-iterator does not resolve top-level symlinks' '
+	test_must_fail test-tool dir-iterator ./dir5 >out &&
 
-	test_cmp expected-follow-sorted-output actual-follow-sorted-output
+	grep "ENOTDIR" out
 '
 
 test_done
diff --git a/t/t0067-parse_pathspec_file.sh b/t/t0067-parse_pathspec_file.sh
index 7bab49f..0188d04 100755
--- a/t/t0067-parse_pathspec_file.sh
+++ b/t/t0067-parse_pathspec_file.sh
@@ -2,6 +2,7 @@
 
 test_description='Test parse_pathspec_file()'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'one item from stdin' '
diff --git a/t/t0068-for-each-repo.sh b/t/t0068-for-each-repo.sh
new file mode 100755
index 0000000..4b90b74
--- /dev/null
+++ b/t/t0068-for-each-repo.sh
@@ -0,0 +1,62 @@
+#!/bin/sh
+
+test_description='git for-each-repo builtin'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+test_expect_success 'run based on configured value' '
+	git init one &&
+	git init two &&
+	git init three &&
+	git init ~/four &&
+	git -C two commit --allow-empty -m "DID NOT RUN" &&
+	git config run.key "$TRASH_DIRECTORY/one" &&
+	git config --add run.key "$TRASH_DIRECTORY/three" &&
+	git config --add run.key "~/four" &&
+	git for-each-repo --config=run.key commit --allow-empty -m "ran" &&
+	git -C one log -1 --pretty=format:%s >message &&
+	grep ran message &&
+	git -C two log -1 --pretty=format:%s >message &&
+	! grep ran message &&
+	git -C three log -1 --pretty=format:%s >message &&
+	grep ran message &&
+	git -C ~/four log -1 --pretty=format:%s >message &&
+	grep ran message &&
+	git for-each-repo --config=run.key -- commit --allow-empty -m "ran again" &&
+	git -C one log -1 --pretty=format:%s >message &&
+	grep again message &&
+	git -C two log -1 --pretty=format:%s >message &&
+	! grep again message &&
+	git -C three log -1 --pretty=format:%s >message &&
+	grep again message &&
+	git -C ~/four log -1 --pretty=format:%s >message &&
+	grep again message
+'
+
+test_expect_success 'do nothing on empty config' '
+	# the whole thing would fail if for-each-ref iterated even
+	# once, because "git help --no-such-option" would fail
+	git for-each-repo --config=bogus.config -- help --no-such-option
+'
+
+test_expect_success 'error on bad config keys' '
+	test_expect_code 129 git for-each-repo --config=a &&
+	test_expect_code 129 git for-each-repo --config=a.b. &&
+	test_expect_code 129 git for-each-repo --config="'\''.b"
+'
+
+test_expect_success 'error on NULL value for config keys' '
+	cat >>.git/config <<-\EOF &&
+	[empty]
+		key
+	EOF
+	cat >expect <<-\EOF &&
+	error: missing value for '\''empty.key'\''
+	EOF
+	test_expect_code 129 git for-each-repo --config=empty.key 2>actual.raw &&
+	grep ^error actual.raw >actual &&
+	test_cmp expect actual
+'
+
+test_done
diff --git a/t/t0069-oidtree.sh b/t/t0069-oidtree.sh
new file mode 100755
index 0000000..889db50
--- /dev/null
+++ b/t/t0069-oidtree.sh
@@ -0,0 +1,50 @@
+#!/bin/sh
+
+test_description='basic tests for the oidtree implementation'
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+maxhexsz=$(test_oid hexsz)
+echoid () {
+	prefix="${1:+$1 }"
+	shift
+	while test $# -gt 0
+	do
+		shortoid="$1"
+		shift
+		difference=$(($maxhexsz - ${#shortoid}))
+		printf "%s%s%0${difference}d\\n" "$prefix" "$shortoid" "0"
+	done
+}
+
+test_expect_success 'oidtree insert and contains' '
+	cat >expect <<-\EOF &&
+		0
+		0
+		0
+		1
+		1
+		0
+	EOF
+	{
+		echoid insert 444 1 2 3 4 5 a b c d e &&
+		echoid contains 44 441 440 444 4440 4444 &&
+		echo clear
+	} | test-tool oidtree >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'oidtree each' '
+	echoid "" 123 321 321 >expect &&
+	{
+		echoid insert f 9 8 123 321 a b c d e &&
+		echo each 12300 &&
+		echo each 3211 &&
+		echo each 3210 &&
+		echo each 32100 &&
+		echo clear
+	} | test-tool oidtree >actual &&
+	test_cmp expect actual
+'
+
+test_done
diff --git a/t/t0070-fundamental.sh b/t/t0070-fundamental.sh
index 7b111a5..0ecec2b 100755
--- a/t/t0070-fundamental.sh
+++ b/t/t0070-fundamental.sh
@@ -6,12 +6,9 @@ test_description='check that the most basic functions work
 Verify wrappers and compatibility functions.
 '
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
-test_expect_success 'character classes (isspace, isalpha etc.)' '
-	test-tool ctype
-'
-
 test_expect_success 'mktemp to nonexistent directory prints filename' '
 	test_must_fail test-tool mktemp doesnotexist/testXXXXXX 2>err &&
 	grep "doesnotexist/test" err
@@ -34,4 +31,80 @@ test_expect_success 'check for a bug in the regex routines' '
 	test-tool regex --bug
 '
 
+test_expect_success 'incomplete sideband messages are reassembled' '
+	test-tool pkt-line send-split-sideband >split-sideband &&
+	test-tool pkt-line receive-sideband <split-sideband 2>err &&
+	grep "Hello, world" err
+'
+
+test_expect_success 'eof on sideband message is reported' '
+	printf 1234 >input &&
+	test-tool pkt-line receive-sideband <input 2>err &&
+	test_grep "unexpected disconnect" err
+'
+
+test_expect_success 'missing sideband designator is reported' '
+	printf 0004 >input &&
+	test-tool pkt-line receive-sideband <input 2>err &&
+	test_grep "missing sideband" err
+'
+
+test_expect_success 'unpack-sideband: --no-chomp-newline' '
+	test_when_finished "rm -f expect-out expect-err" &&
+	test-tool pkt-line send-split-sideband >split-sideband &&
+	test-tool pkt-line unpack-sideband \
+		--no-chomp-newline <split-sideband >out 2>err &&
+	cat >expect-out <<-EOF &&
+		primary: regular output
+	EOF
+	cat >expect-err <<-EOF &&
+		Foo.
+		Bar.
+		Hello, world!
+	EOF
+	test_cmp expect-out out &&
+	test_cmp expect-err err
+'
+
+test_expect_success 'unpack-sideband: --chomp-newline (default)' '
+	test_when_finished "rm -f expect-out expect-err" &&
+	test-tool pkt-line send-split-sideband >split-sideband &&
+	test-tool pkt-line unpack-sideband \
+		--chomp-newline <split-sideband >out 2>err &&
+	printf "primary: regular output" >expect-out &&
+	printf "Foo.Bar.Hello, world!" >expect-err &&
+	test_cmp expect-out out &&
+	test_cmp expect-err err
+'
+
+test_expect_success 'unpack-sideband: packet_reader_read() consumes sideband, no chomp payload' '
+	test_when_finished "rm -f expect-out expect-err" &&
+	test-tool pkt-line send-split-sideband >split-sideband &&
+	test-tool pkt-line unpack-sideband \
+		--reader-use-sideband \
+		--no-chomp-newline <split-sideband >out 2>err &&
+	cat >expect-out <<-EOF &&
+		primary: regular output
+	EOF
+	printf "remote: Foo.        \n"           >expect-err &&
+	printf "remote: Bar.        \n"          >>expect-err &&
+	printf "remote: Hello, world!        \n" >>expect-err &&
+	test_cmp expect-out out &&
+	test_cmp expect-err err
+'
+
+test_expect_success 'unpack-sideband: packet_reader_read() consumes sideband, chomp payload' '
+	test_when_finished "rm -f expect-out expect-err" &&
+	test-tool pkt-line send-split-sideband >split-sideband &&
+	test-tool pkt-line unpack-sideband \
+		--reader-use-sideband \
+		--chomp-newline <split-sideband >out 2>err &&
+	printf "primary: regular output" >expect-out &&
+	printf "remote: Foo.        \n"           >expect-err &&
+	printf "remote: Bar.        \n"          >>expect-err &&
+	printf "remote: Hello, world!        \n" >>expect-err &&
+	test_cmp expect-out out &&
+	test_cmp expect-err err
+'
+
 test_done
diff --git a/t/t0071-sort.sh b/t/t0071-sort.sh
new file mode 100755
index 0000000..ba8ad1d
--- /dev/null
+++ b/t/t0071-sort.sh
@@ -0,0 +1,12 @@
+#!/bin/sh
+
+test_description='verify sort functions'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+test_expect_success 'DEFINE_LIST_SORT_DEBUG' '
+	test-tool mergesort test
+'
+
+test_done
diff --git a/t/t0080-unit-test-output.sh b/t/t0080-unit-test-output.sh
new file mode 100755
index 0000000..6657c11
--- /dev/null
+++ b/t/t0080-unit-test-output.sh
@@ -0,0 +1,59 @@
+#!/bin/sh
+
+test_description='Test the output of the unit test framework'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+test_expect_success 'TAP output from unit tests' '
+	cat >expect <<-EOF &&
+	ok 1 - passing test
+	ok 2 - passing test and assertion return 1
+	# check "1 == 2" failed at t/unit-tests/t-basic.c:76
+	#    left: 1
+	#   right: 2
+	not ok 3 - failing test
+	ok 4 - failing test and assertion return 0
+	not ok 5 - passing TEST_TODO() # TODO
+	ok 6 - passing TEST_TODO() returns 1
+	# todo check ${SQ}check(x)${SQ} succeeded at t/unit-tests/t-basic.c:25
+	not ok 7 - failing TEST_TODO()
+	ok 8 - failing TEST_TODO() returns 0
+	# check "0" failed at t/unit-tests/t-basic.c:30
+	# skipping test - missing prerequisite
+	# skipping check ${SQ}1${SQ} at t/unit-tests/t-basic.c:32
+	ok 9 - test_skip() # SKIP
+	ok 10 - skipped test returns 1
+	# skipping test - missing prerequisite
+	ok 11 - test_skip() inside TEST_TODO() # SKIP
+	ok 12 - test_skip() inside TEST_TODO() returns 1
+	# check "0" failed at t/unit-tests/t-basic.c:48
+	not ok 13 - TEST_TODO() after failing check
+	ok 14 - TEST_TODO() after failing check returns 0
+	# check "0" failed at t/unit-tests/t-basic.c:56
+	not ok 15 - failing check after TEST_TODO()
+	ok 16 - failing check after TEST_TODO() returns 0
+	# check "!strcmp("\thello\\\\", "there\"\n")" failed at t/unit-tests/t-basic.c:61
+	#    left: "\011hello\\\\"
+	#   right: "there\"\012"
+	# check "!strcmp("NULL", NULL)" failed at t/unit-tests/t-basic.c:62
+	#    left: "NULL"
+	#   right: NULL
+	# check "${SQ}a${SQ} == ${SQ}\n${SQ}" failed at t/unit-tests/t-basic.c:63
+	#    left: ${SQ}a${SQ}
+	#   right: ${SQ}\012${SQ}
+	# check "${SQ}\\\\${SQ} == ${SQ}\\${SQ}${SQ}" failed at t/unit-tests/t-basic.c:64
+	#    left: ${SQ}\\\\${SQ}
+	#   right: ${SQ}\\${SQ}${SQ}
+	not ok 17 - messages from failing string and char comparison
+	# BUG: test has no checks at t/unit-tests/t-basic.c:91
+	not ok 18 - test with no checks
+	ok 19 - test with no checks returns 0
+	1..19
+	EOF
+
+	! "$GIT_BUILD_DIR"/t/unit-tests/bin/t-basic >actual &&
+	test_cmp expect actual
+'
+
+test_done
diff --git a/t/t0081-find-pack.sh b/t/t0081-find-pack.sh
new file mode 100755
index 0000000..67b1121
--- /dev/null
+++ b/t/t0081-find-pack.sh
@@ -0,0 +1,82 @@
+#!/bin/sh
+
+test_description='test `test-tool find-pack`'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+test_expect_success 'setup' '
+	test_commit one &&
+	test_commit two &&
+	test_commit three &&
+	test_commit four &&
+	test_commit five
+'
+
+test_expect_success 'repack everything into a single packfile' '
+	git repack -a -d --no-write-bitmap-index &&
+
+	head_commit_pack=$(test-tool find-pack HEAD) &&
+	head_tree_pack=$(test-tool find-pack HEAD^{tree}) &&
+	one_pack=$(test-tool find-pack HEAD:one.t) &&
+	three_pack=$(test-tool find-pack HEAD:three.t) &&
+	old_commit_pack=$(test-tool find-pack HEAD~4) &&
+
+	test-tool find-pack --check-count 1 HEAD &&
+	test-tool find-pack --check-count=1 HEAD^{tree} &&
+	! test-tool find-pack --check-count=0 HEAD:one.t &&
+	! test-tool find-pack -c 2 HEAD:one.t &&
+	test-tool find-pack -c 1 HEAD:three.t &&
+
+	# Packfile exists at the right path
+	case "$head_commit_pack" in
+		".git/objects/pack/pack-"*".pack") true ;;
+		*) false ;;
+	esac &&
+	test -f "$head_commit_pack" &&
+
+	# Everything is in the same pack
+	test "$head_commit_pack" = "$head_tree_pack" &&
+	test "$head_commit_pack" = "$one_pack" &&
+	test "$head_commit_pack" = "$three_pack" &&
+	test "$head_commit_pack" = "$old_commit_pack"
+'
+
+test_expect_success 'add more packfiles' '
+	git rev-parse HEAD^{tree} HEAD:two.t HEAD:four.t >objects &&
+	git pack-objects .git/objects/pack/mypackname1 >packhash1 <objects &&
+
+	git rev-parse HEAD~ HEAD~^{tree} HEAD:five.t >objects &&
+	git pack-objects .git/objects/pack/mypackname2 >packhash2 <objects &&
+
+	head_commit_pack=$(test-tool find-pack HEAD) &&
+
+	# HEAD^{tree} is in 2 packfiles
+	test-tool find-pack HEAD^{tree} >head_tree_packs &&
+	grep "$head_commit_pack" head_tree_packs &&
+	grep mypackname1 head_tree_packs &&
+	! grep mypackname2 head_tree_packs &&
+	test-tool find-pack --check-count 2 HEAD^{tree} &&
+	! test-tool find-pack --check-count 1 HEAD^{tree} &&
+
+	# HEAD:five.t is also in 2 packfiles
+	test-tool find-pack HEAD:five.t >five_packs &&
+	grep "$head_commit_pack" five_packs &&
+	! grep mypackname1 five_packs &&
+	grep mypackname2 five_packs &&
+	test-tool find-pack -c 2 HEAD:five.t &&
+	! test-tool find-pack --check-count=0 HEAD:five.t
+'
+
+test_expect_success 'add more commits (as loose objects)' '
+	test_commit six &&
+	test_commit seven &&
+
+	test -z "$(test-tool find-pack HEAD)" &&
+	test -z "$(test-tool find-pack HEAD:six.t)" &&
+	test-tool find-pack --check-count 0 HEAD &&
+	test-tool find-pack -c 0 HEAD:six.t &&
+	! test-tool find-pack -c 1 HEAD:seven.t
+'
+
+test_done
diff --git a/t/t0081-line-buffer.sh b/t/t0081-line-buffer.sh
deleted file mode 100755
index ce92e6a..0000000
--- a/t/t0081-line-buffer.sh
+++ /dev/null
@@ -1,90 +0,0 @@
-#!/bin/sh
-
-test_description="Test the svn importer's input handling routines.
-
-These tests provide some simple checks that the line_buffer API
-behaves as advertised.
-
-While at it, check that input of newlines and null bytes are handled
-correctly.
-"
-. ./test-lib.sh
-
-test_expect_success 'hello world' '
-	echo ">HELLO" >expect &&
-	test-line-buffer <<-\EOF >actual &&
-	binary 6
-	HELLO
-	EOF
-	test_cmp expect actual
-'
-
-test_expect_success '0-length read, send along greeting' '
-	echo ">HELLO" >expect &&
-	test-line-buffer <<-\EOF >actual &&
-	binary 0
-	copy 6
-	HELLO
-	EOF
-	test_cmp expect actual
-'
-
-test_expect_success !MINGW 'read from file descriptor' '
-	rm -f input &&
-	echo hello >expect &&
-	echo hello >input &&
-	echo copy 6 |
-	test-line-buffer "&4" 4<input >actual &&
-	test_cmp expect actual
-'
-
-test_expect_success 'skip, copy null byte' '
-	echo Q | q_to_nul >expect &&
-	q_to_nul <<-\EOF | test-line-buffer >actual &&
-	skip 2
-	Q
-	copy 2
-	Q
-	EOF
-	test_cmp expect actual
-'
-
-test_expect_success 'read null byte' '
-	echo ">QhelloQ" | q_to_nul >expect &&
-	q_to_nul <<-\EOF | test-line-buffer >actual &&
-	binary 8
-	QhelloQ
-	EOF
-	test_cmp expect actual
-'
-
-test_expect_success 'long reads are truncated' '
-	echo ">foo" >expect &&
-	test-line-buffer <<-\EOF >actual &&
-	binary 5
-	foo
-	EOF
-	test_cmp expect actual
-'
-
-test_expect_success 'long copies are truncated' '
-	printf "%s\n" ">" foo >expect &&
-	test-line-buffer <<-\EOF >actual &&
-	binary 1
-
-	copy 5
-	foo
-	EOF
-	test_cmp expect actual
-'
-
-test_expect_success 'long binary reads are truncated' '
-	echo ">foo" >expect &&
-	test-line-buffer <<-\EOF >actual &&
-	binary 5
-	foo
-	EOF
-	test_cmp expect actual
-'
-
-test_done
diff --git a/t/t0090-cache-tree.sh b/t/t0090-cache-tree.sh
index 5a63369..d8e2fc4 100755
--- a/t/t0090-cache-tree.sh
+++ b/t/t0090-cache-tree.sh
@@ -5,45 +5,43 @@ test_description="Test whether cache-tree is properly updated
 Tests whether various commands properly update and/or rewrite the
 cache-tree extension.
 "
+
+TEST_PASSES_SANITIZE_LEAK=true
  . ./test-lib.sh
 
 cmp_cache_tree () {
 	test-tool dump-cache-tree | sed -e '/#(ref)/d' >actual &&
 	sed "s/$OID_REGEX/SHA/" <actual >filtered &&
-	test_cmp "$1" filtered
+	test_cmp "$1" filtered &&
+	rm filtered
 }
 
 # We don't bother with actually checking the SHA1:
 # test-tool dump-cache-tree already verifies that all existing data is
 # correct.
-generate_expected_cache_tree_rec () {
-	dir="$1${1:+/}" &&
-	parent="$2" &&
-	# ls-files might have foo/bar, foo/bar/baz, and foo/bar/quux
-	# We want to count only foo because it's the only direct child
-	git ls-files >files &&
-	subtrees=$(grep / files|cut -d / -f 1|uniq) &&
-	subtree_count=$(echo "$subtrees"|awk -v c=0 '$1 != "" {++c} END {print c}') &&
-	entries=$(wc -l <files) &&
-	printf "SHA $dir (%d entries, %d subtrees)\n" "$entries" "$subtree_count" &&
-	for subtree in $subtrees
-	do
-		cd "$subtree"
-		generate_expected_cache_tree_rec "$dir$subtree" "$dir" || return 1
-		cd ..
-	done &&
-	dir=$parent
-}
-
 generate_expected_cache_tree () {
-	(
-		generate_expected_cache_tree_rec
-	)
+	pathspec="$1" &&
+	dir="$2${2:+/}" &&
+	git ls-tree --name-only HEAD -- "$pathspec" >files &&
+	git ls-tree --name-only -d HEAD -- "$pathspec" >subtrees &&
+	printf "SHA %s (%d entries, %d subtrees)\n" "$dir" $(wc -l <files) $(wc -l <subtrees) &&
+	while read subtree
+	do
+		generate_expected_cache_tree "$pathspec/$subtree/" "$subtree" || return 1
+	done <subtrees
 }
 
 test_cache_tree () {
-	generate_expected_cache_tree >expect &&
-	cmp_cache_tree expect
+	generate_expected_cache_tree "." >expect &&
+	cmp_cache_tree expect &&
+	rm expect actual files subtrees &&
+	git status --porcelain -- ':!status' ':!expected.status' >status &&
+	if test -n "$1"
+	then
+		test_cmp "$1" status
+	else
+		test_must_be_empty status
+	fi
 }
 
 test_invalid_cache_tree () {
@@ -54,7 +52,7 @@ test_invalid_cache_tree () {
 }
 
 test_no_cache_tree () {
-	: >expect &&
+	>expect &&
 	cmp_cache_tree expect
 }
 
@@ -83,18 +81,6 @@ test_expect_success 'git-add in subdir invalidates cache-tree' '
 	test_invalid_cache_tree
 '
 
-cat >before <<\EOF
-SHA  (3 entries, 2 subtrees)
-SHA dir1/ (1 entries, 0 subtrees)
-SHA dir2/ (1 entries, 0 subtrees)
-EOF
-
-cat >expect <<\EOF
-invalid                                   (2 subtrees)
-invalid                                  dir1/ (0 subtrees)
-SHA dir2/ (1 entries, 0 subtrees)
-EOF
-
 test_expect_success 'git-add in subdir does not invalidate sibling cache-tree' '
 	git tag no-children &&
 	test_when_finished "git reset --hard no-children; git read-tree HEAD" &&
@@ -102,9 +88,20 @@ test_expect_success 'git-add in subdir does not invalidate sibling cache-tree' '
 	test_commit dir1/a &&
 	test_commit dir2/b &&
 	echo "I changed this file" >dir1/a &&
+	test_when_finished "rm before" &&
+	cat >before <<-\EOF &&
+	SHA  (3 entries, 2 subtrees)
+	SHA dir1/ (1 entries, 0 subtrees)
+	SHA dir2/ (1 entries, 0 subtrees)
+	EOF
 	cmp_cache_tree before &&
 	echo "I changed this file" >dir1/a &&
 	git add dir1/a &&
+	cat >expect <<-\EOF &&
+	invalid                                   (2 subtrees)
+	invalid                                  dir1/ (0 subtrees)
+	SHA dir2/ (1 entries, 0 subtrees)
+	EOF
 	cmp_cache_tree expect
 '
 
@@ -133,6 +130,7 @@ test_expect_success 'second commit has cache-tree' '
 '
 
 test_expect_success PERL 'commit --interactive gives cache-tree on partial commit' '
+	test_when_finished "git reset --hard" &&
 	cat <<-\EOT >foo.c &&
 	int foo()
 	{
@@ -159,7 +157,10 @@ test_expect_success PERL 'commit --interactive gives cache-tree on partial commi
 	EOT
 	test_write_lines p 1 "" s n y q |
 	git commit --interactive -m foo &&
-	test_cache_tree
+	cat <<-\EOF >expected.status &&
+	 M foo.c
+	EOF
+	test_cache_tree expected.status
 '
 
 test_expect_success PERL 'commit -p with shrinking cache-tree' '
@@ -196,6 +197,7 @@ test_expect_success 'reset --hard gives cache-tree' '
 
 test_expect_success 'reset --hard without index gives cache-tree' '
 	rm -f .git/index &&
+	git clean -fd &&
 	git reset --hard &&
 	test_cache_tree
 '
@@ -250,7 +252,10 @@ test_expect_success 'partial commit gives cache-tree' '
 	git add one.t &&
 	echo "some other change" >two.t &&
 	git commit two.t -m partial &&
-	test_cache_tree
+	cat <<-\EOF >expected.status &&
+	M  one.t
+	EOF
+	test_cache_tree expected.status
 '
 
 test_expect_success 'no phantom error when switching trees' '
diff --git a/t/t0091-bugreport.sh b/t/t0091-bugreport.sh
index 526304f..fca3904 100755
--- a/t/t0091-bugreport.sh
+++ b/t/t0091-bugreport.sh
@@ -2,31 +2,53 @@
 
 test_description='git bugreport'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
-# Headers "[System Info]" will be followed by a non-empty line if we put some
-# information there; we can make sure all our headers were followed by some
-# information to check if the command was successful.
-HEADER_PATTERN="^\[.*\]$"
-
-check_all_headers_populated () {
-	while read -r line
-	do
-		if test "$(grep "$HEADER_PATTERN" "$line")"
-		then
-			echo "$line"
-			read -r nextline
-			if test -z "$nextline"; then
-				return 1;
-			fi
-		fi
-	done
-}
-
-test_expect_success 'creates a report with content in the right places' '
-	test_when_finished rm git-bugreport-check-headers.txt &&
-	git bugreport -s check-headers &&
-	check_all_headers_populated <git-bugreport-check-headers.txt
+test_expect_success 'create a report' '
+	git bugreport -s format &&
+	test_file_not_empty git-bugreport-format.txt
+'
+
+test_expect_success 'report contains wanted template (before first section)' '
+	sed -ne "/^\[/q;p" git-bugreport-format.txt >actual &&
+	cat >expect <<-\EOF &&
+	Thank you for filling out a Git bug report!
+	Please answer the following questions to help us understand your issue.
+
+	What did you do before the bug happened? (Steps to reproduce your issue)
+
+	What did you expect to happen? (Expected behavior)
+
+	What happened instead? (Actual behavior)
+
+	What'\''s different between what you expected and what actually happened?
+
+	Anything else you want to add:
+
+	Please review the rest of the bug report below.
+	You can delete any lines you don'\''t wish to share.
+
+
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'sanity check "System Info" section' '
+	test_when_finished rm -f git-bugreport-format.txt &&
+
+	sed -ne "/^\[System Info\]$/,/^$/p" <git-bugreport-format.txt >system &&
+
+	# The beginning should match "git version --build-options" verbatim,
+	# but rather than checking bit-for-bit equality, just test some basics.
+	grep "git version " system &&
+	grep "shell-path: ." system &&
+
+	# After the version, there should be some more info.
+	# This is bound to differ from environment to environment,
+	# so we just do some rather high-level checks.
+	grep "uname: ." system &&
+	grep "compiler info: ." system
 '
 
 test_expect_success 'dies if file with same name as report already exists' '
@@ -43,7 +65,14 @@ test_expect_success '--output-directory puts the report in the provided dir' '
 
 test_expect_success 'incorrect arguments abort with usage' '
 	test_must_fail git bugreport --false 2>output &&
-	test_i18ngrep usage output &&
+	test_grep usage output &&
+	test_path_is_missing git-bugreport-*
+'
+
+test_expect_success 'incorrect positional arguments abort with usage and hint' '
+	test_must_fail git bugreport false 2>output &&
+	test_grep usage output &&
+	test_grep false output &&
 	test_path_is_missing git-bugreport-*
 '
 
@@ -59,18 +88,70 @@ test_expect_success 'can create leading directories outside of a git dir' '
 
 test_expect_success 'indicates populated hooks' '
 	test_when_finished rm git-bugreport-hooks.txt &&
-	test_when_finished rm -fr .git/hooks &&
-	rm -fr .git/hooks &&
-	mkdir .git/hooks &&
-	for hook in applypatch-msg prepare-commit-msg.sample
-	do
-		write_script ".git/hooks/$hook" <<-EOF || return 1
-		echo "hook $hook exists"
-		EOF
-	done &&
+
+	test_hook applypatch-msg <<-\EOF &&
+	true
+	EOF
+	test_hook unknown-hook <<-\EOF &&
+	true
+	EOF
 	git bugreport -s hooks &&
-	grep applypatch-msg git-bugreport-hooks.txt &&
-	! grep prepare-commit-msg git-bugreport-hooks.txt
+
+	sort >expect <<-\EOF &&
+	[Enabled Hooks]
+	applypatch-msg
+	EOF
+
+	sed -ne "/^\[Enabled Hooks\]$/,/^$/p" <git-bugreport-hooks.txt >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success UNZIP '--diagnose creates diagnostics zip archive' '
+	test_when_finished rm -rf report &&
+
+	git bugreport --diagnose -o report -s test >out &&
+
+	zip_path=report/git-diagnostics-test.zip &&
+	grep "Available space" out &&
+	test_path_is_file "$zip_path" &&
+
+	# Check zipped archive content
+	"$GIT_UNZIP" -p "$zip_path" diagnostics.log >out &&
+	test_file_not_empty out &&
+
+	"$GIT_UNZIP" -p "$zip_path" packs-local.txt >out &&
+	grep ".git/objects" out &&
+
+	"$GIT_UNZIP" -p "$zip_path" objects-local.txt >out &&
+	grep "^Total: [0-9][0-9]*" out &&
+
+	# Should not include .git directory contents by default
+	! "$GIT_UNZIP" -l "$zip_path" | grep ".git/"
+'
+
+test_expect_success UNZIP '--diagnose=stats excludes .git dir contents' '
+	test_when_finished rm -rf report &&
+
+	git bugreport --diagnose=stats -o report -s test >out &&
+
+	# Includes pack quantity/size info
+	"$GIT_UNZIP" -p "$zip_path" packs-local.txt >out &&
+	grep ".git/objects" out &&
+
+	# Does not include .git directory contents
+	! "$GIT_UNZIP" -l "$zip_path" | grep ".git/"
+'
+
+test_expect_success UNZIP '--diagnose=all includes .git dir contents' '
+	test_when_finished rm -rf report &&
+
+	git bugreport --diagnose=all -o report -s test >out &&
+
+	# Includes .git directory contents
+	"$GIT_UNZIP" -l "$zip_path" | grep ".git/" &&
+
+	"$GIT_UNZIP" -p "$zip_path" .git/HEAD >out &&
+	test_file_not_empty out
 '
 
 test_done
diff --git a/t/t0092-diagnose.sh b/t/t0092-diagnose.sh
new file mode 100755
index 0000000..133e574
--- /dev/null
+++ b/t/t0092-diagnose.sh
@@ -0,0 +1,72 @@
+#!/bin/sh
+
+test_description='git diagnose'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+test_expect_success UNZIP 'creates diagnostics zip archive' '
+	test_when_finished rm -rf report &&
+
+	git diagnose -o report -s test >out &&
+	grep "Available space" out &&
+
+	zip_path=report/git-diagnostics-test.zip &&
+	test_path_is_file "$zip_path" &&
+
+	# Check zipped archive content
+	"$GIT_UNZIP" -p "$zip_path" diagnostics.log >out &&
+	test_file_not_empty out &&
+
+	"$GIT_UNZIP" -p "$zip_path" packs-local.txt >out &&
+	grep ".git/objects" out &&
+
+	"$GIT_UNZIP" -p "$zip_path" objects-local.txt >out &&
+	grep "^Total: [0-9][0-9]*" out &&
+
+	# Should not include .git directory contents by default
+	! "$GIT_UNZIP" -l "$zip_path" | grep ".git/"
+'
+
+test_expect_success UNZIP 'counts loose objects' '
+	test_commit A &&
+
+	# After committing, should have non-zero loose objects
+	git diagnose -o test-count -s 1 >out &&
+	zip_path=test-count/git-diagnostics-1.zip &&
+	"$GIT_UNZIP" -p "$zip_path" objects-local.txt >out &&
+	grep "^Total: [1-9][0-9]* loose objects" out
+'
+
+test_expect_success UNZIP '--mode=stats excludes .git dir contents' '
+	test_when_finished rm -rf report &&
+
+	git diagnose -o report -s test --mode=stats >out &&
+
+	# Includes pack quantity/size info
+	zip_path=report/git-diagnostics-test.zip &&
+	"$GIT_UNZIP" -p "$zip_path" packs-local.txt >out &&
+	grep ".git/objects" out &&
+
+	# Does not include .git directory contents
+	! "$GIT_UNZIP" -l "$zip_path" | grep ".git/"
+'
+
+test_expect_success UNZIP '--mode=all includes .git dir contents' '
+	test_when_finished rm -rf report &&
+
+	git diagnose -o report -s test --mode=all >out &&
+
+	# Includes pack quantity/size info
+	zip_path=report/git-diagnostics-test.zip &&
+	"$GIT_UNZIP" -p "$zip_path" packs-local.txt >out &&
+	grep ".git/objects" out &&
+
+	# Includes .git directory contents
+	"$GIT_UNZIP" -l "$zip_path" | grep ".git/" &&
+
+	"$GIT_UNZIP" -p "$zip_path" .git/HEAD >out &&
+	test_file_not_empty out
+'
+
+test_done
diff --git a/t/t0095-bloom.sh b/t/t0095-bloom.sh
index 232ba2c..b567383 100755
--- a/t/t0095-bloom.sh
+++ b/t/t0095-bloom.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='Testing the various Bloom filter computations in bloom.c'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'compute unseeded murmur3 hash for empty string' '
@@ -67,12 +69,12 @@ test_expect_success 'compute bloom key for test string 2' '
 	test_cmp expect actual
 '
 
-test_expect_success 'get bloom filters for commit with no changes' '
+test_expect_success !SANITIZE_LEAK 'get bloom filters for commit with no changes' '
 	git init &&
 	git commit --allow-empty -m "c0" &&
 	cat >expect <<-\EOF &&
-	Filter_Length:0
-	Filter_Data:
+	Filter_Length:1
+	Filter_Data:00|
 	EOF
 	test-tool bloom get_filter_for_commit "$(git rev-parse HEAD)" >actual &&
 	test_cmp expect actual
@@ -84,7 +86,7 @@ test_expect_success 'get bloom filter for commit with 10 changes' '
 	mkdir smallDir &&
 	for i in $(test_seq 0 9)
 	do
-		echo $i >smallDir/$i
+		echo $i >smallDir/$i || return 1
 	done &&
 	git add smallDir &&
 	git commit -m "commit with 10 changes" &&
@@ -102,13 +104,13 @@ test_expect_success EXPENSIVE 'get bloom filter for commit with 513 changes' '
 	mkdir bigDir &&
 	for i in $(test_seq 0 511)
 	do
-		echo $i >bigDir/$i
+		echo $i >bigDir/$i || return 1
 	done &&
 	git add bigDir &&
 	git commit -m "commit with 513 changes" &&
 	cat >expect <<-\EOF &&
-	Filter_Length:0
-	Filter_Data:
+	Filter_Length:1
+	Filter_Data:ff|
 	EOF
 	test-tool bloom get_filter_for_commit "$(git rev-parse HEAD)" >actual &&
 	test_cmp expect actual
diff --git a/t/t0100-previous.sh b/t/t0100-previous.sh
index 58c0b7e..70a3223 100755
--- a/t/t0100-previous.sh
+++ b/t/t0100-previous.sh
@@ -2,13 +2,19 @@
 
 test_description='previous branch syntax @{-n}'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'branch -d @{-1}' '
 	test_commit A &&
 	git checkout -b junk &&
 	git checkout - &&
-	test "$(git symbolic-ref HEAD)" = refs/heads/master &&
+	echo refs/heads/main >expect &&
+	git symbolic-ref HEAD >actual &&
+	test_cmp expect actual &&
 	git branch -d @{-1} &&
 	test_must_fail git rev-parse --verify refs/heads/junk
 '
@@ -17,9 +23,11 @@ test_expect_success 'branch -d @{-12} when there is not enough switches yet' '
 	git reflog expire --expire=now &&
 	git checkout -b junk2 &&
 	git checkout - &&
-	test "$(git symbolic-ref HEAD)" = refs/heads/master &&
+	echo refs/heads/main >expect &&
+	git symbolic-ref HEAD >actual &&
+	test_cmp expect actual &&
 	test_must_fail git branch -d @{-12} &&
-	git rev-parse --verify refs/heads/master
+	git rev-parse --verify refs/heads/main
 '
 
 test_expect_success 'merge @{-1}' '
@@ -28,19 +36,19 @@ test_expect_success 'merge @{-1}' '
 	git checkout A &&
 	test_commit C &&
 	test_commit D &&
-	git branch -f master B &&
+	git branch -f main B &&
 	git branch -f other &&
 	git checkout other &&
-	git checkout master &&
+	git checkout main &&
 	git merge @{-1} &&
 	git cat-file commit HEAD | grep "Merge branch '\''other'\''"
 '
 
 test_expect_success 'merge @{-1}~1' '
-	git checkout master &&
+	git checkout main &&
 	git reset --hard B &&
 	git checkout other &&
-	git checkout master &&
+	git checkout main &&
 	git merge @{-1}~1 &&
 	git cat-file commit HEAD >actual &&
 	grep "Merge branch '\''other'\''" actual
@@ -48,11 +56,11 @@ test_expect_success 'merge @{-1}~1' '
 
 test_expect_success 'merge @{-100} before checking out that many branches yet' '
 	git reflog expire --expire=now &&
-	git checkout -f master &&
+	git checkout -f main &&
 	git reset --hard B &&
 	git branch -f other C &&
 	git checkout other &&
-	git checkout master &&
+	git checkout main &&
 	test_must_fail git merge @{-100}
 '
 
diff --git a/t/t0101-at-syntax.sh b/t/t0101-at-syntax.sh
index a1998b5..878aadd 100755
--- a/t/t0101-at-syntax.sh
+++ b/t/t0101-at-syntax.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='various @{whatever} syntax tests'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
diff --git a/t/t0110-urlmatch-normalization.sh b/t/t0110-urlmatch-normalization.sh
index f99529d..12d817f 100755
--- a/t/t0110-urlmatch-normalization.sh
+++ b/t/t0110-urlmatch-normalization.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='urlmatch URL normalization'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # The base name of the test url files
@@ -47,7 +49,7 @@ test_expect_success 'url authority' '
 	test-tool urlmatch-normalization "scheme://@host" &&
 	test-tool urlmatch-normalization "scheme://%00@host" &&
 	! test-tool urlmatch-normalization "scheme://%%@host" &&
-	! test-tool urlmatch-normalization "scheme://host_" &&
+	test-tool urlmatch-normalization "scheme://host_" &&
 	test-tool urlmatch-normalization "scheme://user:pass@host/" &&
 	test-tool urlmatch-normalization "scheme://@host/" &&
 	test-tool urlmatch-normalization "scheme://host/" &&
diff --git a/t/t0200-gettext-basic.sh b/t/t0200-gettext-basic.sh
index 8853d8a..522fb2a 100755
--- a/t/t0200-gettext-basic.sh
+++ b/t/t0200-gettext-basic.sh
@@ -5,6 +5,7 @@
 
 test_description='Gettext support for Git'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./lib-gettext.sh
 
 test_expect_success "sanity: \$GIT_INTERNAL_GETTEXT_SH_SCHEME is set (to $GIT_INTERNAL_GETTEXT_SH_SCHEME)" '
diff --git a/t/t0201-gettext-fallbacks.sh b/t/t0201-gettext-fallbacks.sh
index 90da1c7..8724ce1 100755
--- a/t/t0201-gettext-fallbacks.sh
+++ b/t/t0201-gettext-fallbacks.sh
@@ -8,6 +8,7 @@ test_description='Gettext Shell fallbacks'
 GIT_INTERNAL_GETTEXT_TEST_FALLBACKS=YesPlease
 export GIT_INTERNAL_GETTEXT_TEST_FALLBACKS
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./lib-gettext.sh
 
 test_expect_success "sanity: \$GIT_INTERNAL_GETTEXT_SH_SCHEME is set (to $GIT_INTERNAL_GETTEXT_SH_SCHEME)" '
@@ -18,7 +19,7 @@ test_expect_success 'sanity: $GIT_INTERNAL_GETTEXT_TEST_FALLBACKS is set' '
     test -n "$GIT_INTERNAL_GETTEXT_TEST_FALLBACKS"
 '
 
-test_expect_success C_LOCALE_OUTPUT 'sanity: $GIT_INTERNAL_GETTEXT_SH_SCHEME" is fallthrough' '
+test_expect_success 'sanity: $GIT_INTERNAL_GETTEXT_SH_SCHEME" is fallthrough' '
     echo fallthrough >expect &&
     echo $GIT_INTERNAL_GETTEXT_SH_SCHEME >actual &&
     test_cmp expect actual
@@ -27,25 +28,25 @@ test_expect_success C_LOCALE_OUTPUT 'sanity: $GIT_INTERNAL_GETTEXT_SH_SCHEME" is
 test_expect_success 'gettext: our gettext() fallback has pass-through semantics' '
     printf "test" >expect &&
     gettext "test" >actual &&
-    test_i18ncmp expect actual &&
+    test_cmp expect actual &&
     printf "test more words" >expect &&
     gettext "test more words" >actual &&
-    test_i18ncmp expect actual
+    test_cmp expect actual
 '
 
 test_expect_success 'eval_gettext: our eval_gettext() fallback has pass-through semantics' '
     printf "test" >expect &&
     eval_gettext "test" >actual &&
-    test_i18ncmp expect actual &&
+    test_cmp expect actual &&
     printf "test more words" >expect &&
     eval_gettext "test more words" >actual &&
-    test_i18ncmp expect actual
+    test_cmp expect actual
 '
 
 test_expect_success 'eval_gettext: our eval_gettext() fallback can interpolate variables' '
     printf "test YesPlease" >expect &&
     GIT_INTERNAL_GETTEXT_TEST_FALLBACKS=YesPlease eval_gettext "test \$GIT_INTERNAL_GETTEXT_TEST_FALLBACKS" >actual &&
-    test_i18ncmp expect actual
+    test_cmp expect actual
 '
 
 test_expect_success 'eval_gettext: our eval_gettext() fallback can interpolate variables with spaces' '
@@ -53,7 +54,7 @@ test_expect_success 'eval_gettext: our eval_gettext() fallback can interpolate v
     export cmdline &&
     printf "When you have resolved this problem, run git am --resolved." >expect &&
     eval_gettext "When you have resolved this problem, run \$cmdline --resolved." >actual &&
-    test_i18ncmp expect actual
+    test_cmp expect actual
 '
 
 test_expect_success 'eval_gettext: our eval_gettext() fallback can interpolate variables with spaces and quotes' '
@@ -61,7 +62,7 @@ test_expect_success 'eval_gettext: our eval_gettext() fallback can interpolate v
     export cmdline &&
     printf "When you have resolved this problem, run \"git am --resolved\"." >expect &&
     eval_gettext "When you have resolved this problem, run \"\$cmdline --resolved\"." >actual &&
-    test_i18ncmp expect actual
+    test_cmp expect actual
 '
 
 test_done
diff --git a/t/t0202-gettext-perl.sh b/t/t0202-gettext-perl.sh
index a29d166..5a6f280 100755
--- a/t/t0202-gettext-perl.sh
+++ b/t/t0202-gettext-perl.sh
@@ -5,23 +5,14 @@
 
 test_description='Perl gettext interface (Git::I18N)'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./lib-gettext.sh
+. "$TEST_DIRECTORY"/lib-perl.sh
+skip_all_if_no_Test_More
 
-if ! test_have_prereq PERL; then
-	skip_all='skipping perl interface tests, perl not available'
-	test_done
-fi
-
-perl -MTest::More -e 0 2>/dev/null || {
-	skip_all="Perl Test::More unavailable, skipping test"
-	test_done
-}
-
-# The external test will outputs its own plan
-test_external_has_tap=1
-
-test_external_without_stderr \
-    'Perl Git::I18N API' \
-    perl "$TEST_DIRECTORY"/t0202/test.pl
+test_expect_success 'run t0202/test.pl to test Git::I18N.pm' '
+	"$PERL_PATH" "$TEST_DIRECTORY"/t0202/test.pl 2>stderr &&
+	test_must_be_empty stderr
+'
 
 test_done
diff --git a/t/t0202/test.pl b/t/t0202/test.pl
index 2cbf7b9..47d96a2 100755
--- a/t/t0202/test.pl
+++ b/t/t0202/test.pl
@@ -1,5 +1,5 @@
 #!/usr/bin/perl
-use 5.008;
+use 5.008001;
 use lib (split(/:/, $ENV{GITPERLLIB}));
 use strict;
 use warnings;
diff --git a/t/t0203-gettext-setlocale-sanity.sh b/t/t0203-gettext-setlocale-sanity.sh
index 0ce1f22..86cff32 100755
--- a/t/t0203-gettext-setlocale-sanity.sh
+++ b/t/t0203-gettext-setlocale-sanity.sh
@@ -5,6 +5,7 @@
 
 test_description="The Git C functions aren't broken by setlocale(3)"
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./lib-gettext.sh
 
 test_expect_success 'git show a ISO-8859-1 commit under C locale' '
diff --git a/t/t0204-gettext-reencode-sanity.sh b/t/t0204-gettext-reencode-sanity.sh
index 8437e51..310a450 100755
--- a/t/t0204-gettext-reencode-sanity.sh
+++ b/t/t0204-gettext-reencode-sanity.sh
@@ -5,6 +5,7 @@
 
 test_description="Gettext reencoding of our *.po/*.mo files works"
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./lib-gettext.sh
 
 # The constants used in a tricky observation for undefined behaviour
@@ -81,7 +82,7 @@ test_expect_success GETTEXT_ISO_LOCALE 'gettext.c: git init UTF-8 -> ISO-8859-1'
     printf "Bjó til tóma Git lind" >expect &&
     LANGUAGE=is LC_ALL="$is_IS_iso_locale" git init repo >actual &&
     test_when_finished "rm -rf repo" &&
-    grep "^$(cat expect | iconv -f UTF-8 -t ISO8859-1) " actual
+    grep "^$(iconv -f UTF-8 -t ISO8859-1 <expect) " actual
 '
 
 test_done
diff --git a/t/t0205-gettext-poison.sh b/t/t0205-gettext-poison.sh
deleted file mode 100755
index f9fa16a..0000000
--- a/t/t0205-gettext-poison.sh
+++ /dev/null
@@ -1,39 +0,0 @@
-#!/bin/sh
-#
-# Copyright (c) 2010 Ævar Arnfjörð Bjarmason
-#
-
-test_description='Gettext Shell poison'
-
-GIT_TEST_GETTEXT_POISON=true
-export GIT_TEST_GETTEXT_POISON
-. ./lib-gettext.sh
-
-test_expect_success 'sanity: $GIT_INTERNAL_GETTEXT_SH_SCHEME" is poison' '
-    test "$GIT_INTERNAL_GETTEXT_SH_SCHEME" = "poison"
-'
-
-test_expect_success 'gettext: our gettext() fallback has poison semantics' '
-    printf "# GETTEXT POISON #" >expect &&
-    gettext "test" >actual &&
-    test_cmp expect actual &&
-    printf "# GETTEXT POISON #" >expect &&
-    gettext "test more words" >actual &&
-    test_cmp expect actual
-'
-
-test_expect_success 'eval_gettext: our eval_gettext() fallback has poison semantics' '
-    printf "# GETTEXT POISON #" >expect &&
-    eval_gettext "test" >actual &&
-    test_cmp expect actual &&
-    printf "# GETTEXT POISON #" >expect &&
-    eval_gettext "test more words" >actual &&
-    test_cmp expect actual
-'
-
-test_expect_success "gettext: invalid GIT_TEST_GETTEXT_POISON value doesn't infinitely loop" "
-	test_must_fail env GIT_TEST_GETTEXT_POISON=xyz git version 2>error &&
-	grep \"fatal: bad numeric config value 'xyz' for 'GIT_TEST_GETTEXT_POISON': invalid unit\" error
-"
-
-test_done
diff --git a/t/t0210-trace2-normal.sh b/t/t0210-trace2-normal.sh
index ce7574e..c312657 100755
--- a/t/t0210-trace2-normal.sh
+++ b/t/t0210-trace2-normal.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='test trace2 facility (normal target)'
+
+TEST_PASSES_SANITIZE_LEAK=false
 . ./test-lib.sh
 
 # Turn off any inherited trace2 settings for this test.
@@ -147,6 +149,101 @@ test_expect_success 'normal stream, error event' '
 	test_cmp expect actual
 '
 
+# Verb 007bug
+#
+# Check that BUG writes to trace2
+
+test_expect_success 'BUG messages are written to trace2' '
+	test_when_finished "rm trace.normal actual expect" &&
+	test_must_fail env GIT_TRACE2="$(pwd)/trace.normal" test-tool trace2 007bug &&
+	perl "$TEST_DIRECTORY/t0210/scrub_normal.perl" <trace.normal >actual &&
+	cat >expect <<-EOF &&
+		version $V
+		start _EXE_ trace2 007bug
+		cmd_name trace2 (trace2)
+		error the bug message
+		exit elapsed:_TIME_ code:99
+		atexit elapsed:_TIME_ code:99
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'bug messages with BUG_if_bug() are written to trace2' '
+	test_when_finished "rm trace.normal actual expect" &&
+	test_expect_code 99 env GIT_TRACE2="$(pwd)/trace.normal" \
+		test-tool trace2 008bug 2>err &&
+	cat >expect <<-\EOF &&
+	a bug message
+	another bug message
+	an explicit BUG_if_bug() following bug() call(s) is nice, but not required
+	EOF
+	sed "s/^.*: //" <err >actual &&
+	test_cmp expect actual &&
+
+	perl "$TEST_DIRECTORY/t0210/scrub_normal.perl" <trace.normal >actual &&
+	cat >expect <<-EOF &&
+		version $V
+		start _EXE_ trace2 008bug
+		cmd_name trace2 (trace2)
+		error a bug message
+		error another bug message
+		error an explicit BUG_if_bug() following bug() call(s) is nice, but not required
+		exit elapsed:_TIME_ code:99
+		atexit elapsed:_TIME_ code:99
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'bug messages without explicit BUG_if_bug() are written to trace2' '
+	test_when_finished "rm trace.normal actual expect" &&
+	test_expect_code 99 env GIT_TRACE2="$(pwd)/trace.normal" \
+		test-tool trace2 009bug_BUG 2>err &&
+	cat >expect <<-\EOF &&
+	a bug message
+	another bug message
+	had bug() call(s) in this process without explicit BUG_if_bug()
+	EOF
+	sed "s/^.*: //" <err >actual &&
+	test_cmp expect actual &&
+
+	perl "$TEST_DIRECTORY/t0210/scrub_normal.perl" <trace.normal >actual &&
+	cat >expect <<-EOF &&
+		version $V
+		start _EXE_ trace2 009bug_BUG
+		cmd_name trace2 (trace2)
+		error a bug message
+		error another bug message
+		error on exit(): had bug() call(s) in this process without explicit BUG_if_bug()
+		exit elapsed:_TIME_ code:99
+		atexit elapsed:_TIME_ code:99
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'bug messages followed by BUG() are written to trace2' '
+	test_when_finished "rm trace.normal actual expect" &&
+	test_expect_code 99 env GIT_TRACE2="$(pwd)/trace.normal" \
+		test-tool trace2 010bug_BUG 2>err &&
+	cat >expect <<-\EOF &&
+	a bug message
+	a BUG message
+	EOF
+	sed "s/^.*: //" <err >actual &&
+	test_cmp expect actual &&
+
+	perl "$TEST_DIRECTORY/t0210/scrub_normal.perl" <trace.normal >actual &&
+	cat >expect <<-EOF &&
+		version $V
+		start _EXE_ trace2 010bug_BUG
+		cmd_name trace2 (trace2)
+		error a bug message
+		error a BUG message
+		exit elapsed:_TIME_ code:99
+		atexit elapsed:_TIME_ code:99
+	EOF
+	test_cmp expect actual
+'
+
 sane_unset GIT_TRACE2_BRIEF
 
 # Now test without environment variables and get all Trace2 settings
@@ -186,4 +283,22 @@ test_expect_success 'using global config with include' '
 	test_cmp expect actual
 '
 
+test_expect_success 'unsafe URLs are redacted by default' '
+	test_when_finished \
+		"rm -r trace.normal unredacted.normal clone clone2" &&
+
+	test_config_global \
+		"url.$(pwd).insteadOf" https://user:pwd@example.com/ &&
+	test_config_global trace2.configParams "core.*,remote.*.url" &&
+
+	GIT_TRACE2="$(pwd)/trace.normal" \
+		git clone https://user:pwd@example.com/ clone &&
+	! grep user:pwd trace.normal &&
+
+	GIT_TRACE2_REDACT=0 GIT_TRACE2="$(pwd)/unredacted.normal" \
+		git clone https://user:pwd@example.com/ clone2 &&
+	grep "start .* clone https://user:pwd@example.com" unredacted.normal &&
+	grep "remote.origin.url=https://user:pwd@example.com" unredacted.normal
+'
+
 test_done
diff --git a/t/t0210/scrub_normal.perl b/t/t0210/scrub_normal.perl
index c65d1a8..7cc4de3 100644
--- a/t/t0210/scrub_normal.perl
+++ b/t/t0210/scrub_normal.perl
@@ -42,6 +42,12 @@ while (<>) {
 	# so just omit it for testing purposes.
 	# print "cmd_path _EXE_\n";
     }
+    elsif ($line =~ m/^cmd_ancestry/) {
+	# 'cmd_ancestry' is not implemented everywhere, so for portability's
+	# sake, skip it when parsing normal.
+	#
+	# print "$line";
+    }
     else {
 	print "$line";
     }
diff --git a/t/t0211-trace2-perf.sh b/t/t0211-trace2-perf.sh
index 6ee8ee3..13ef69b 100755
--- a/t/t0211-trace2-perf.sh
+++ b/t/t0211-trace2-perf.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='test trace2 facility (perf target)'
+
+TEST_PASSES_SANITIZE_LEAK=false
 . ./test-lib.sh
 
 # Turn off any inherited trace2 settings for this test.
@@ -171,4 +173,349 @@ test_expect_success 'using global config, perf stream, return code 0' '
 	test_cmp expect actual
 '
 
+# Exercise the stopwatch timers in a loop and confirm that we have
+# as many start/stop intervals as expected.  We cannot really test the
+# actual (total, min, max) timer values, so we have to assume that they
+# are good, but we can verify the interval count.
+#
+# The timer "test/test1" should only emit a global summary "timer" event.
+# The timer "test/test2" should emit per-thread "th_timer" events and a
+# global summary "timer" event.
+
+have_timer_event () {
+	thread=$1 event=$2 category=$3 name=$4 intervals=$5 file=$6 &&
+
+	pattern="d0|${thread}|${event}||||${category}|name:${name} intervals:${intervals}" &&
+
+	grep "${pattern}" ${file}
+}
+
+test_expect_success 'stopwatch timer test/test1' '
+	test_when_finished "rm trace.perf actual" &&
+	test_config_global trace2.perfBrief 1 &&
+	test_config_global trace2.perfTarget "$(pwd)/trace.perf" &&
+
+	# Use the timer "test1" 5 times from "main".
+	test-tool trace2 100timer 5 10 &&
+
+	perl "$TEST_DIRECTORY/t0211/scrub_perf.perl" <trace.perf >actual &&
+
+	have_timer_event "main" "timer" "test" "test1" 5 actual
+'
+
+test_expect_success PTHREADS 'stopwatch timer test/test2' '
+	test_when_finished "rm trace.perf actual" &&
+	test_config_global trace2.perfBrief 1 &&
+	test_config_global trace2.perfTarget "$(pwd)/trace.perf" &&
+
+	# Use the timer "test2" 5 times each in 3 threads.
+	test-tool trace2 101timer 5 10 3 &&
+
+	perl "$TEST_DIRECTORY/t0211/scrub_perf.perl" <trace.perf >actual &&
+
+	# So we should have 3 per-thread events of 5 each.
+	have_timer_event "th01:ut_101" "th_timer" "test" "test2" 5 actual &&
+	have_timer_event "th02:ut_101" "th_timer" "test" "test2" 5 actual &&
+	have_timer_event "th03:ut_101" "th_timer" "test" "test2" 5 actual &&
+
+	# And we should have 15 total uses.
+	have_timer_event "main" "timer" "test" "test2" 15 actual
+'
+
+# Exercise the global counters and confirm that we get the expected values.
+#
+# The counter "test/test1" should only emit a global summary "counter" event.
+# The counter "test/test2" could emit per-thread "th_counter" events and a
+# global summary "counter" event.
+
+have_counter_event () {
+	thread=$1 event=$2 category=$3 name=$4 value=$5 file=$6 &&
+
+	pattern="d0|${thread}|${event}||||${category}|name:${name} value:${value}" &&
+
+	grep "${patern}" ${file}
+}
+
+test_expect_success 'global counter test/test1' '
+	test_when_finished "rm trace.perf actual" &&
+	test_config_global trace2.perfBrief 1 &&
+	test_config_global trace2.perfTarget "$(pwd)/trace.perf" &&
+
+	# Use the counter "test1" and add n integers.
+	test-tool trace2 200counter 1 2 3 4 5 &&
+
+	perl "$TEST_DIRECTORY/t0211/scrub_perf.perl" <trace.perf >actual &&
+
+	have_counter_event "main" "counter" "test" "test1" 15 actual
+'
+
+test_expect_success PTHREADS 'global counter test/test2' '
+	test_when_finished "rm trace.perf actual" &&
+	test_config_global trace2.perfBrief 1 &&
+	test_config_global trace2.perfTarget "$(pwd)/trace.perf" &&
+
+	# Add 2 integers to the counter "test2" in each of 3 threads.
+	test-tool trace2 201counter 7 13 3 &&
+
+	perl "$TEST_DIRECTORY/t0211/scrub_perf.perl" <trace.perf >actual &&
+
+	# So we should have 3 per-thread events of 5 each.
+	have_counter_event "th01:ut_201" "th_counter" "test" "test2" 20 actual &&
+	have_counter_event "th02:ut_201" "th_counter" "test" "test2" 20 actual &&
+	have_counter_event "th03:ut_201" "th_counter" "test" "test2" 20 actual &&
+
+	# And we should have a single event with the total across all threads.
+	have_counter_event "main" "counter" "test" "test2" 60 actual
+'
+
+test_expect_success 'unsafe URLs are redacted by default' '
+	test_when_finished \
+		"rm -r actual trace.perf unredacted.perf clone clone2" &&
+
+	test_config_global \
+		"url.$(pwd).insteadOf" https://user:pwd@example.com/ &&
+	test_config_global trace2.configParams "core.*,remote.*.url" &&
+
+	GIT_TRACE2_PERF="$(pwd)/trace.perf" \
+		git clone https://user:pwd@example.com/ clone &&
+	! grep user:pwd trace.perf &&
+
+	GIT_TRACE2_REDACT=0 GIT_TRACE2_PERF="$(pwd)/unredacted.perf" \
+		git clone https://user:pwd@example.com/ clone2 &&
+	perl "$TEST_DIRECTORY/t0211/scrub_perf.perl" <unredacted.perf >actual &&
+	grep "d0|main|start|.* clone https://user:pwd@example.com" actual &&
+	grep "d0|main|def_param|.*|remote.origin.url:https://user:pwd@example.com" actual
+'
+
+# Confirm that the requested command produces a "cmd_name" and a
+# set of "def_param" events.
+#
+try_simple () {
+	test_when_finished "rm prop.perf actual" &&
+
+	cmd=$1 &&
+	cmd_name=$2 &&
+
+	test_config_global "trace2.configParams" "cfg.prop.*" &&
+	test_config_global "trace2.envvars" "ENV_PROP_FOO,ENV_PROP_BAR" &&
+
+	test_config_global "cfg.prop.foo" "red" &&
+
+	ENV_PROP_FOO=blue \
+		GIT_TRACE2_PERF="$(pwd)/prop.perf" \
+			$cmd &&
+	perl "$TEST_DIRECTORY/t0211/scrub_perf.perl" <prop.perf >actual &&
+	grep "d0|main|cmd_name|.*|$cmd_name" actual &&
+	grep "d0|main|def_param|.*|cfg.prop.foo:red" actual &&
+	grep "d0|main|def_param|.*|ENV_PROP_FOO:blue" actual
+}
+
+# Representative mainstream builtin Git command dispatched
+# in run_builtin() in git.c
+#
+test_expect_success 'expect def_params for normal builtin command' '
+	try_simple "git version" "version"
+'
+
+# Representative query command dispatched in handle_options()
+# in git.c
+#
+test_expect_success 'expect def_params for query command' '
+	try_simple "git --man-path" "_query_"
+'
+
+# remote-curl.c does not use the builtin setup in git.c, so confirm
+# that executables built from remote-curl.c emit def_params.
+#
+# Also tests the dashed-command handling where "git foo" silently
+# spawns "git-foo".  Make sure that both commands should emit
+# def_params.
+#
+# Pass bogus arguments to remote-https and allow the command to fail
+# because we don't actually have a remote to fetch from.  We just want
+# to see the run-dashed code run an executable built from
+# remote-curl.c rather than git.c.  Confirm that we get def_param
+# events from both layers.
+#
+test_expect_success 'expect def_params for remote-curl and _run_dashed_' '
+	test_when_finished "rm prop.perf actual" &&
+
+	test_config_global "trace2.configParams" "cfg.prop.*" &&
+	test_config_global "trace2.envvars" "ENV_PROP_FOO,ENV_PROP_BAR" &&
+
+	test_config_global "cfg.prop.foo" "red" &&
+
+	test_might_fail env \
+		ENV_PROP_FOO=blue \
+		GIT_TRACE2_PERF="$(pwd)/prop.perf" \
+		git remote-http x y &&
+
+	perl "$TEST_DIRECTORY/t0211/scrub_perf.perl" <prop.perf >actual &&
+
+	grep "d0|main|cmd_name|.*|_run_dashed_" actual &&
+	grep "d0|main|def_param|.*|cfg.prop.foo:red" actual &&
+	grep "d0|main|def_param|.*|ENV_PROP_FOO:blue" actual &&
+
+	grep "d1|main|cmd_name|.*|remote-curl" actual &&
+	grep "d1|main|def_param|.*|cfg.prop.foo:red" actual &&
+	grep "d1|main|def_param|.*|ENV_PROP_FOO:blue" actual
+'
+
+# Similarly, `git-http-fetch` is not built from git.c so do a
+# trivial fetch so that the main git.c run-dashed code spawns
+# an executable built from http-fetch.c.  Confirm that we get
+# def_param events from both layers.
+#
+test_expect_success 'expect def_params for http-fetch and _run_dashed_' '
+	test_when_finished "rm prop.perf actual" &&
+
+	test_config_global "trace2.configParams" "cfg.prop.*" &&
+	test_config_global "trace2.envvars" "ENV_PROP_FOO,ENV_PROP_BAR" &&
+
+	test_config_global "cfg.prop.foo" "red" &&
+
+	test_might_fail env \
+		ENV_PROP_FOO=blue \
+		GIT_TRACE2_PERF="$(pwd)/prop.perf" \
+		git http-fetch --stdin file:/// <<-EOF &&
+	EOF
+
+	perl "$TEST_DIRECTORY/t0211/scrub_perf.perl" <prop.perf >actual &&
+
+	grep "d0|main|cmd_name|.*|_run_dashed_" actual &&
+	grep "d0|main|def_param|.*|cfg.prop.foo:red" actual &&
+	grep "d0|main|def_param|.*|ENV_PROP_FOO:blue" actual &&
+
+	grep "d1|main|cmd_name|.*|http-fetch" actual &&
+	grep "d1|main|def_param|.*|cfg.prop.foo:red" actual &&
+	grep "d1|main|def_param|.*|ENV_PROP_FOO:blue" actual
+'
+
+# Historically, alias expansion explicitly emitted the def_param
+# events (independent of whether the command was a builtin, a Git
+# command or arbitrary shell command) so that it wasn't dependent
+# upon the unpeeling of the alias. Let's make sure that we preserve
+# the net effect.
+#
+test_expect_success 'expect def_params during git alias expansion' '
+	test_when_finished "rm prop.perf actual" &&
+
+	test_config_global "trace2.configParams" "cfg.prop.*" &&
+	test_config_global "trace2.envvars" "ENV_PROP_FOO,ENV_PROP_BAR" &&
+
+	test_config_global "cfg.prop.foo" "red" &&
+
+	test_config_global "alias.xxx" "version" &&
+
+	ENV_PROP_FOO=blue \
+		GIT_TRACE2_PERF="$(pwd)/prop.perf" \
+			git xxx &&
+
+	perl "$TEST_DIRECTORY/t0211/scrub_perf.perl" <prop.perf >actual &&
+
+	# "git xxx" is first mapped to "git-xxx" and the child will fail.
+	grep "d0|main|cmd_name|.*|_run_dashed_ (_run_dashed_)" actual &&
+
+	# We unpeel that and substitute "version" into "xxx" (giving
+	# "git version") and update the cmd_name event.
+	grep "d0|main|cmd_name|.*|_run_git_alias_ (_run_dashed_/_run_git_alias_)" actual &&
+
+	# These def_param events could be associated with either of the
+	# above cmd_name events.  It does not matter.
+	grep "d0|main|def_param|.*|cfg.prop.foo:red" actual &&
+	grep "d0|main|def_param|.*|ENV_PROP_FOO:blue" actual &&
+
+	# The "git version" child sees a different cmd_name hierarchy.
+	# Also test the def_param (only for completeness).
+	grep "d1|main|cmd_name|.*|version (_run_dashed_/_run_git_alias_/version)" actual &&
+	grep "d1|main|def_param|.*|cfg.prop.foo:red" actual &&
+	grep "d1|main|def_param|.*|ENV_PROP_FOO:blue" actual
+'
+
+test_expect_success 'expect def_params during shell alias expansion' '
+	test_when_finished "rm prop.perf actual" &&
+
+	test_config_global "trace2.configParams" "cfg.prop.*" &&
+	test_config_global "trace2.envvars" "ENV_PROP_FOO,ENV_PROP_BAR" &&
+
+	test_config_global "cfg.prop.foo" "red" &&
+
+	test_config_global "alias.xxx" "!git version" &&
+
+	ENV_PROP_FOO=blue \
+		GIT_TRACE2_PERF="$(pwd)/prop.perf" \
+			git xxx &&
+
+	perl "$TEST_DIRECTORY/t0211/scrub_perf.perl" <prop.perf >actual &&
+
+	# "git xxx" is first mapped to "git-xxx" and the child will fail.
+	grep "d0|main|cmd_name|.*|_run_dashed_ (_run_dashed_)" actual &&
+
+	# We unpeel that and substitute "git version" for "git xxx" (as a
+	# shell command.  Another cmd_name event is emitted as we unpeel.
+	grep "d0|main|cmd_name|.*|_run_shell_alias_ (_run_dashed_/_run_shell_alias_)" actual &&
+
+	# These def_param events could be associated with either of the
+	# above cmd_name events.  It does not matter.
+	grep "d0|main|def_param|.*|cfg.prop.foo:red" actual &&
+	grep "d0|main|def_param|.*|ENV_PROP_FOO:blue" actual &&
+
+	# We get the following only because we used a git command for the
+	# shell command. In general, it could have been a shell script and
+	# we would see nothing.
+	#
+	# The child knows the cmd_name hierarchy so it includes it.
+	grep "d1|main|cmd_name|.*|version (_run_dashed_/_run_shell_alias_/version)" actual &&
+	grep "d1|main|def_param|.*|cfg.prop.foo:red" actual &&
+	grep "d1|main|def_param|.*|ENV_PROP_FOO:blue" actual
+'
+
+test_expect_success 'expect def_params during nested git alias expansion' '
+	test_when_finished "rm prop.perf actual" &&
+
+	test_config_global "trace2.configParams" "cfg.prop.*" &&
+	test_config_global "trace2.envvars" "ENV_PROP_FOO,ENV_PROP_BAR" &&
+
+	test_config_global "cfg.prop.foo" "red" &&
+
+	test_config_global "alias.xxx" "yyy" &&
+	test_config_global "alias.yyy" "version" &&
+
+	ENV_PROP_FOO=blue \
+		GIT_TRACE2_PERF="$(pwd)/prop.perf" \
+			git xxx &&
+
+	perl "$TEST_DIRECTORY/t0211/scrub_perf.perl" <prop.perf >actual &&
+
+	# "git xxx" is first mapped to "git-xxx" and try to spawn "git-xxx"
+	# and the child will fail.
+	grep "d0|main|cmd_name|.*|_run_dashed_ (_run_dashed_)" actual &&
+	grep "d0|main|child_start|.*|.* class:dashed argv:\[git-xxx\]" actual &&
+
+	# We unpeel that and substitute "yyy" into "xxx" (giving "git yyy")
+	# and spawn "git-yyy" and the child will fail.
+	grep "d0|main|alias|.*|alias:xxx argv:\[yyy\]" actual &&
+	grep "d0|main|cmd_name|.*|_run_dashed_ (_run_dashed_/_run_dashed_)" actual &&
+	grep "d0|main|child_start|.*|.* class:dashed argv:\[git-yyy\]" actual &&
+
+	# We unpeel that and substitute "version" into "xxx" (giving
+	# "git version") and update the cmd_name event.
+	grep "d0|main|alias|.*|alias:yyy argv:\[version\]" actual &&
+	grep "d0|main|cmd_name|.*|_run_git_alias_ (_run_dashed_/_run_dashed_/_run_git_alias_)" actual &&
+
+	# These def_param events could be associated with any of the
+	# above cmd_name events.  It does not matter.
+	grep "d0|main|def_param|.*|cfg.prop.foo:red" actual >actual.matches &&
+	grep "d0|main|def_param|.*|ENV_PROP_FOO:blue" actual &&
+
+	# However, we do not want them repeated each time we unpeel.
+	test_line_count = 1 actual.matches &&
+
+	# The "git version" child sees a different cmd_name hierarchy.
+	# Also test the def_param (only for completeness).
+	grep "d1|main|cmd_name|.*|version (_run_dashed_/_run_dashed_/_run_git_alias_/version)" actual &&
+	grep "d1|main|def_param|.*|cfg.prop.foo:red" actual &&
+	grep "d1|main|def_param|.*|ENV_PROP_FOO:blue" actual
+'
+
 test_done
diff --git a/t/t0211/scrub_perf.perl b/t/t0211/scrub_perf.perl
index 351af78..7a50bae 100644
--- a/t/t0211/scrub_perf.perl
+++ b/t/t0211/scrub_perf.perl
@@ -44,6 +44,11 @@ while (<>) {
 	# $tokens[$col_rest] = "_EXE_";
 	goto SKIP_LINE;
     }
+    elsif ($tokens[$col_event] =~ m/cmd_ancestry/) {
+	# 'cmd_ancestry' is platform-specific and not implemented everywhere,
+	# so skip it.
+	goto SKIP_LINE;
+    }
     elsif ($tokens[$col_event] =~ m/child_exit/) {
 	$tokens[$col_rest] =~ s/ pid:\d* / pid:_PID_ /;
     }
@@ -54,6 +59,16 @@ while (<>) {
 	    # and highly variable.  Just omit them.
 	    goto SKIP_LINE;
 	}
+	if ($tokens[$col_category] =~ m/fsync/) {
+	    # fsync events aren't interesting for the test
+	    goto SKIP_LINE;
+	}
+    }
+    elsif ($tokens[$col_event] =~ m/timer/) {
+	# This also captures "th_timer" events
+	$tokens[$col_rest] =~ s/ total:\d+\.\d*/ total:_T_TOTAL_/;
+	$tokens[$col_rest] =~ s/ min:\d+\.\d*/ min:_T_MIN_/;
+	$tokens[$col_rest] =~ s/ max:\d+\.\d*/ max:_T_MAX_/;
     }
 
     # t_abs and t_rel are either blank or a float.  Replace the float
diff --git a/t/t0212-trace2-event.sh b/t/t0212-trace2-event.sh
index 1529155..147643d 100755
--- a/t/t0212-trace2-event.sh
+++ b/t/t0212-trace2-event.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='test trace2 facility'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # Turn off any inherited trace2 settings for this test.
@@ -321,4 +323,44 @@ test_expect_success 'discard traces when there are too many files' '
 	head -n2 trace_target_dir/git-trace2-discard | tail -n1 | grep \"event\":\"too_many_files\"
 '
 
+# In the following "...redact..." tests, skip testing the GIT_TRACE2_REDACT=0
+# case because we would need to exactly model the full JSON event stream like
+# we did in the basic tests above and I do not think it is worth it.
+
+test_expect_success 'unsafe URLs are redacted by default in cmd_start events' '
+	test_when_finished \
+		"rm -r trace.event" &&
+
+	GIT_TRACE2_EVENT="$(pwd)/trace.event" \
+		test-tool trace2 300redact_start git clone https://user:pwd@example.com/ clone2 &&
+	! grep user:pwd trace.event
+'
+
+test_expect_success 'unsafe URLs are redacted by default in child_start events' '
+	test_when_finished \
+		"rm -r trace.event" &&
+
+	GIT_TRACE2_EVENT="$(pwd)/trace.event" \
+		test-tool trace2 301redact_child_start git clone https://user:pwd@example.com/ clone2 &&
+	! grep user:pwd trace.event
+'
+
+test_expect_success 'unsafe URLs are redacted by default in exec events' '
+	test_when_finished \
+		"rm -r trace.event" &&
+
+	GIT_TRACE2_EVENT="$(pwd)/trace.event" \
+		test-tool trace2 302redact_exec git clone https://user:pwd@example.com/ clone2 &&
+	! grep user:pwd trace.event
+'
+
+test_expect_success 'unsafe URLs are redacted by default in def_param events' '
+	test_when_finished \
+		"rm -r trace.event" &&
+
+	GIT_TRACE2_EVENT="$(pwd)/trace.event" \
+		test-tool trace2 303redact_def_param url https://user:pwd@example.com/ &&
+	! grep user:pwd trace.event
+'
+
 test_done
diff --git a/t/t0212/parse_events.perl b/t/t0212/parse_events.perl
index 6584bb5..30a9f51 100644
--- a/t/t0212/parse_events.perl
+++ b/t/t0212/parse_events.perl
@@ -132,7 +132,10 @@ while (<>) {
 	# just omit it for testing purposes.
 	# $processes->{$sid}->{'path'} = "_EXE_";
     }
-    
+    elsif ($event eq 'cmd_ancestry') {
+	# 'cmd_ancestry' is platform-specific and not implemented everywhere, so
+	# just skip it for testing purposes.
+    }
     elsif ($event eq 'cmd_name') {
 	$processes->{$sid}->{'name'} = $line->{'name'};
 	$processes->{$sid}->{'hierarchy'} = $line->{'hierarchy'};
@@ -213,12 +216,19 @@ while (<>) {
 
     elsif ($event eq 'data') {
 	my $cat = $line->{'category'};
-	if ($cat eq 'test_category') {
-	    
-	    my $key = $line->{'key'};
-	    my $value = $line->{'value'};
-	    $processes->{$sid}->{'data'}->{$cat}->{$key} = $value;
-	}
+	my $key = $line->{'key'};
+	my $value = $line->{'value'};
+	$processes->{$sid}->{'data'}->{$cat}->{$key} = $value;
+    }
+
+    elsif ($event eq 'data_json') {
+	# NEEDSWORK: Ignore due to
+	# compat/win32/trace2_win32_process_info.c, which should log a
+	# "cmd_ancestry" event instead.
+    }
+
+    else {
+	push @{$processes->{$sid}->{$event}} => $line->{value};
     }
 
     # This trace2 target does not emit 'printf' events.
diff --git a/t/t0300-credentials.sh b/t/t0300-credentials.sh
index bc2d740..400f6bd 100755
--- a/t/t0300-credentials.sh
+++ b/t/t0300-credentials.sh
@@ -35,6 +35,16 @@ test_expect_success 'setup helper scripts' '
 	test -z "$pass" || echo password=$pass
 	EOF
 
+	write_script git-credential-verbatim-with-expiry <<-\EOF &&
+	user=$1; shift
+	pass=$1; shift
+	pexpiry=$1; shift
+	. ./dump
+	test -z "$user" || echo username=$user
+	test -z "$pass" || echo password=$pass
+	test -z "$pexpiry" || echo password_expiry_utc=$pexpiry
+	EOF
+
 	PATH="$PWD:$PATH"
 '
 
@@ -109,6 +119,43 @@ test_expect_success 'credential_fill continues through partial response' '
 	EOF
 '
 
+test_expect_success 'credential_fill populates password_expiry_utc' '
+	check fill "verbatim-with-expiry one two 9999999999" <<-\EOF
+	protocol=http
+	host=example.com
+	--
+	protocol=http
+	host=example.com
+	username=one
+	password=two
+	password_expiry_utc=9999999999
+	--
+	verbatim-with-expiry: get
+	verbatim-with-expiry: protocol=http
+	verbatim-with-expiry: host=example.com
+	EOF
+'
+
+test_expect_success 'credential_fill ignores expired password' '
+	check fill "verbatim-with-expiry one two 5" "verbatim three four" <<-\EOF
+	protocol=http
+	host=example.com
+	--
+	protocol=http
+	host=example.com
+	username=three
+	password=four
+	--
+	verbatim-with-expiry: get
+	verbatim-with-expiry: protocol=http
+	verbatim-with-expiry: host=example.com
+	verbatim: get
+	verbatim: protocol=http
+	verbatim: host=example.com
+	verbatim: username=one
+	EOF
+'
+
 test_expect_success 'credential_fill passes along metadata' '
 	check fill "verbatim one two" <<-\EOF
 	protocol=ftp
@@ -149,6 +196,42 @@ test_expect_success 'credential_approve calls all helpers' '
 	EOF
 '
 
+test_expect_success 'credential_approve stores password expiry' '
+	check approve useless <<-\EOF
+	protocol=http
+	host=example.com
+	username=foo
+	password=bar
+	password_expiry_utc=9999999999
+	--
+	--
+	useless: store
+	useless: protocol=http
+	useless: host=example.com
+	useless: username=foo
+	useless: password=bar
+	useless: password_expiry_utc=9999999999
+	EOF
+'
+
+test_expect_success 'credential_approve stores oauth refresh token' '
+	check approve useless <<-\EOF
+	protocol=http
+	host=example.com
+	username=foo
+	password=bar
+	oauth_refresh_token=xyzzy
+	--
+	--
+	useless: store
+	useless: protocol=http
+	useless: host=example.com
+	useless: username=foo
+	useless: password=bar
+	useless: oauth_refresh_token=xyzzy
+	EOF
+'
+
 test_expect_success 'do not bother storing password-less credential' '
 	check approve useless <<-\EOF
 	protocol=http
@@ -159,6 +242,17 @@ test_expect_success 'do not bother storing password-less credential' '
 	EOF
 '
 
+test_expect_success 'credential_approve does not store expired password' '
+	check approve useless <<-\EOF
+	protocol=http
+	host=example.com
+	username=foo
+	password=bar
+	password_expiry_utc=5
+	--
+	--
+	EOF
+'
 
 test_expect_success 'credential_reject calls all helpers' '
 	check reject useless "verbatim one two" <<-\EOF
@@ -181,6 +275,24 @@ test_expect_success 'credential_reject calls all helpers' '
 	EOF
 '
 
+test_expect_success 'credential_reject erases credential regardless of expiry' '
+	check reject useless <<-\EOF
+	protocol=http
+	host=example.com
+	username=foo
+	password=bar
+	password_expiry_utc=5
+	--
+	--
+	useless: erase
+	useless: protocol=http
+	useless: host=example.com
+	useless: username=foo
+	useless: password=bar
+	useless: password_expiry_utc=5
+	EOF
+'
+
 test_expect_success 'usernames can be preserved' '
 	check fill "verbatim \"\" three" <<-\EOF
 	protocol=http
@@ -265,6 +377,32 @@ test_expect_success 'internal getpass does not ask for known username' '
 	EOF
 '
 
+test_expect_success 'git-credential respects core.askPass' '
+	write_script alternate-askpass <<-\EOF &&
+	echo >&2 "alternate askpass invoked"
+	echo alternate-value
+	EOF
+	test_config core.askpass "$PWD/alternate-askpass" &&
+	(
+		# unset GIT_ASKPASS set by lib-credential.sh which would
+		# override our config, but do so in a subshell so that we do
+		# not interfere with other tests
+		sane_unset GIT_ASKPASS &&
+		check fill <<-\EOF
+		protocol=http
+		host=example.com
+		--
+		protocol=http
+		host=example.com
+		username=alternate-value
+		password=alternate-value
+		--
+		alternate askpass invoked
+		alternate askpass invoked
+		EOF
+	)
+'
+
 HELPER="!f() {
 		cat >/dev/null
 		echo username=foo
@@ -552,7 +690,7 @@ test_expect_success 'helpers can abort the process' '
 	quit: host=example.com
 	fatal: credential helper '\''quit'\'' told us to quit
 	EOF
-	test_i18ncmp expect stderr
+	test_cmp expect stderr
 '
 
 test_expect_success 'empty helper spec resets helper list' '
@@ -580,7 +718,7 @@ test_expect_success 'url parser rejects embedded newlines' '
 	warning: url contains a newline in its path component: https://one.example.com?%0ahost=two.example.com/
 	fatal: credential url cannot be parsed: https://one.example.com?%0ahost=two.example.com/
 	EOF
-	test_i18ncmp expect stderr
+	test_cmp expect stderr
 '
 
 test_expect_success 'host-less URLs are parsed as empty host' '
@@ -607,7 +745,7 @@ test_expect_success 'credential system refuses to work with missing host' '
 	cat >expect <<-\EOF &&
 	fatal: refusing to work with credential missing host field
 	EOF
-	test_i18ncmp expect stderr
+	test_cmp expect stderr
 '
 
 test_expect_success 'credential system refuses to work with missing protocol' '
@@ -617,7 +755,7 @@ test_expect_success 'credential system refuses to work with missing protocol' '
 	cat >expect <<-\EOF &&
 	fatal: refusing to work with credential missing protocol field
 	EOF
-	test_i18ncmp expect stderr
+	test_cmp expect stderr
 '
 
 # usage: check_host_and_path <url> <expected-host> <expected-path>
@@ -688,8 +826,8 @@ test_expect_success 'credential config with partial URLs' '
 
 	git -c credential.$partial.helper=yep \
 		-c credential.with%0anewline.username=uh-oh \
-		credential fill <stdin >stdout 2>stderr &&
-	test_i18ngrep "skipping credential lookup for key" stderr
+		credential fill <stdin 2>stderr &&
+	test_grep "skipping credential lookup for key" stderr
 '
 
 test_done
diff --git a/t/t0301-credential-cache.sh b/t/t0301-credential-cache.sh
index ebd5fa5..f2c146f 100755
--- a/t/t0301-credential-cache.sh
+++ b/t/t0301-credential-cache.sh
@@ -8,12 +8,37 @@ test -z "$NO_UNIX_SOCKETS" || {
 	skip_all='skipping credential-cache tests, unix sockets not available'
 	test_done
 }
+if test_have_prereq MINGW
+then
+	service_running=$(sc query afunix | grep "4  RUNNING")
+	test -z "$service_running" || {
+		skip_all='skipping credential-cache tests, unix sockets not available'
+		test_done
+	}
+fi
+
+uname_s=$(uname -s)
+case $uname_s in
+*MINGW*)
+	test_path_is_socket () {
+		# `test -S` cannot detect Win10's Unix sockets
+		test_path_exists "$1"
+	}
+	;;
+*)
+	test_path_is_socket () {
+		test -S "$1"
+	}
+	;;
+esac
 
 # don't leave a stale daemon running
 test_atexit 'git credential-cache exit'
 
 # test that the daemon works with no special setup
 helper_test cache
+helper_test_password_expiry_utc cache
+helper_test_oauth_refresh_token cache
 
 test_expect_success 'socket defaults to ~/.cache/git/credential/socket' '
 	test_when_finished "
@@ -21,7 +46,7 @@ test_expect_success 'socket defaults to ~/.cache/git/credential/socket' '
 		rmdir -p .cache/git/credential/
 	" &&
 	test_path_is_missing "$HOME/.git-credential-cache" &&
-	test -S "$HOME/.cache/git/credential/socket"
+	test_path_is_socket "$HOME/.cache/git/credential/socket"
 '
 
 XDG_CACHE_HOME="$HOME/xdg"
@@ -31,7 +56,7 @@ helper_test cache
 
 test_expect_success "use custom XDG_CACHE_HOME if set and default sockets are not created" '
 	test_when_finished "git credential-cache exit" &&
-	test -S "$XDG_CACHE_HOME/git/credential/socket" &&
+	test_path_is_socket "$XDG_CACHE_HOME/git/credential/socket" &&
 	test_path_is_missing "$HOME/.git-credential-cache/socket" &&
 	test_path_is_missing "$HOME/.cache/git/credential/socket"
 '
@@ -48,7 +73,7 @@ test_expect_success 'credential-cache --socket option overrides default location
 	username=store-user
 	password=store-pass
 	EOF
-	test -S "$HOME/dir/socket"
+	test_path_is_socket "$HOME/dir/socket"
 '
 
 test_expect_success "use custom XDG_CACHE_HOME even if xdg socket exists" '
@@ -62,7 +87,7 @@ test_expect_success "use custom XDG_CACHE_HOME even if xdg socket exists" '
 	username=store-user
 	password=store-pass
 	EOF
-	test -S "$HOME/.cache/git/credential/socket" &&
+	test_path_is_socket "$HOME/.cache/git/credential/socket" &&
 	XDG_CACHE_HOME="$HOME/xdg" &&
 	export XDG_CACHE_HOME &&
 	check approve cache <<-\EOF &&
@@ -71,7 +96,7 @@ test_expect_success "use custom XDG_CACHE_HOME even if xdg socket exists" '
 	username=store-user
 	password=store-pass
 	EOF
-	test -S "$XDG_CACHE_HOME/git/credential/socket"
+	test_path_is_socket "$XDG_CACHE_HOME/git/credential/socket"
 '
 
 test_expect_success 'use user socket if user directory exists' '
@@ -79,14 +104,15 @@ test_expect_success 'use user socket if user directory exists' '
 		git credential-cache exit &&
 		rmdir \"\$HOME/.git-credential-cache/\"
 	" &&
-	mkdir -p -m 700 "$HOME/.git-credential-cache/" &&
+	mkdir -p "$HOME/.git-credential-cache/" &&
+	chmod 700 "$HOME/.git-credential-cache/" &&
 	check approve cache <<-\EOF &&
 	protocol=https
 	host=example.com
 	username=store-user
 	password=store-pass
 	EOF
-	test -S "$HOME/.git-credential-cache/socket"
+	test_path_is_socket "$HOME/.git-credential-cache/socket"
 '
 
 test_expect_success SYMLINKS 'use user socket if user directory is a symlink to a directory' '
@@ -103,7 +129,7 @@ test_expect_success SYMLINKS 'use user socket if user directory is a symlink to
 	username=store-user
 	password=store-pass
 	EOF
-	test -S "$HOME/.git-credential-cache/socket"
+	test_path_is_socket "$HOME/.git-credential-cache/socket"
 '
 
 helper_test_timeout cache --timeout=1
diff --git a/t/t0303-credential-external.sh b/t/t0303-credential-external.sh
index f028fd1..72ae405 100755
--- a/t/t0303-credential-external.sh
+++ b/t/t0303-credential-external.sh
@@ -32,9 +32,24 @@ commands.
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-credential.sh
 
+# If we're not given a specific external helper to run against,
+# there isn't much to test. But we can still run through our
+# battery of tests with a fake helper and check that the
+# test themselves are self-consistent and clean up after
+# themselves.
+#
+# We'll use the "store" helper, since we can easily inspect
+# its state by looking at the on-disk file. But since it doesn't
+# implement any caching or expiry logic, we'll cheat and override
+# the "check" function to just report all results as OK.
 if test -z "$GIT_TEST_CREDENTIAL_HELPER"; then
-	skip_all="used to test external credential helpers"
-	test_done
+	GIT_TEST_CREDENTIAL_HELPER=store
+	GIT_TEST_CREDENTIAL_HELPER_TIMEOUT=store
+	check () {
+		test "$1" = "approve" || return 0
+		git -c credential.helper=store credential approve
+	}
+	check_cleanup=t
 fi
 
 test -z "$GIT_TEST_CREDENTIAL_HELPER_SETUP" ||
@@ -45,6 +60,8 @@ test -z "$GIT_TEST_CREDENTIAL_HELPER_SETUP" ||
 helper_test_clean "$GIT_TEST_CREDENTIAL_HELPER"
 
 helper_test "$GIT_TEST_CREDENTIAL_HELPER"
+helper_test_password_expiry_utc "$GIT_TEST_CREDENTIAL_HELPER"
+helper_test_oauth_refresh_token "$GIT_TEST_CREDENTIAL_HELPER"
 
 if test -z "$GIT_TEST_CREDENTIAL_HELPER_TIMEOUT"; then
 	say "# skipping timeout tests (GIT_TEST_CREDENTIAL_HELPER_TIMEOUT not set)"
@@ -57,4 +74,11 @@ fi
 # might be long-term system storage
 helper_test_clean "$GIT_TEST_CREDENTIAL_HELPER"
 
+if test "$check_cleanup" = "t"
+then
+	test_expect_success 'test cleanup removes everything' '
+		test_must_be_empty "$HOME/.git-credentials"
+	'
+fi
+
 test_done
diff --git a/t/t0410-partial-clone.sh b/t/t0410-partial-clone.sh
index a5ebdf9..88a66f0 100755
--- a/t/t0410-partial-clone.sh
+++ b/t/t0410-partial-clone.sh
@@ -4,6 +4,13 @@ test_description='partial clone'
 
 . ./test-lib.sh
 
+# missing promisor objects cause repacks which write bitmaps to fail
+GIT_TEST_MULTI_PACK_INDEX_WRITE_BITMAP=0
+# When enabled, some commands will write commit-graphs. This causes fsck
+# to fail when delete_object() is called because fsck will attempt to
+# verify the out-of-sync commit graph.
+GIT_TEST_COMMIT_GRAPH=0
+
 delete_object () {
 	rm $1/.git/objects/$(echo $2 | sed -e 's|^..|&/|')
 }
@@ -42,7 +49,7 @@ test_expect_success 'convert shallow clone to partial clone' '
 	test_cmp_config -C client 1 core.repositoryformatversion
 '
 
-test_expect_success SHA1 'convert to partial clone with noop extension' '
+test_expect_success DEFAULT_REPO_FORMAT 'convert to partial clone with noop extension' '
 	rm -fr server client &&
 	test_create_repo server &&
 	test_commit -C server my_commit 1 &&
@@ -53,7 +60,7 @@ test_expect_success SHA1 'convert to partial clone with noop extension' '
 	git -C client fetch --unshallow --filter="blob:none"
 '
 
-test_expect_success SHA1 'converting to partial clone fails with unrecognized extension' '
+test_expect_success DEFAULT_REPO_FORMAT 'converting to partial clone fails with unrecognized extension' '
 	rm -fr server client &&
 	test_create_repo server &&
 	test_commit -C server my_commit 1 &&
@@ -183,7 +190,7 @@ test_expect_success 'missing CLI object, but promised, passes fsck' '
 '
 
 test_expect_success 'fetching of missing objects' '
-	rm -rf repo &&
+	rm -rf repo err &&
 	test_create_repo server &&
 	test_commit -C server foo &&
 	git -C server repack -a -d --write-bitmap-index &&
@@ -194,7 +201,10 @@ test_expect_success 'fetching of missing objects' '
 
 	git -C repo config core.repositoryformatversion 1 &&
 	git -C repo config extensions.partialclone "origin" &&
-	git -C repo cat-file -p "$HASH" &&
+	git -C repo cat-file -p "$HASH" 2>err &&
+
+	# Ensure that no spurious FETCH_HEAD messages are written
+	! grep FETCH_HEAD err &&
 
 	# Ensure that the .promisor file is written, and check that its
 	# associated packfile contains the object
@@ -205,6 +215,20 @@ test_expect_success 'fetching of missing objects' '
 	grep "$HASH" out
 '
 
+test_expect_success 'fetching of a promised object that promisor remote no longer has' '
+	rm -f err &&
+	test_create_repo unreliable-server &&
+	git -C unreliable-server config uploadpack.allowanysha1inwant 1 &&
+	git -C unreliable-server config uploadpack.allowfilter 1 &&
+	test_commit -C unreliable-server foo &&
+
+	git clone --filter=blob:none --no-checkout "file://$(pwd)/unreliable-server" unreliable-client &&
+
+	rm -rf unreliable-server/.git/objects/* &&
+	test_must_fail git -C unreliable-client checkout HEAD 2>err &&
+	grep "could not fetch.*from promisor remote" err
+'
+
 test_expect_success 'fetching of missing objects works with ref-in-want enabled' '
 	# ref-in-want requires protocol version 2
 	git -C server config protocol.version 2 &&
@@ -214,7 +238,7 @@ test_expect_success 'fetching of missing objects works with ref-in-want enabled'
 	rm -rf repo/.git/objects/* &&
 	rm -f trace &&
 	GIT_TRACE_PACKET="$(pwd)/trace" git -C repo cat-file -p "$HASH" &&
-	grep "git< fetch=.*ref-in-want" trace
+	grep "fetch< fetch=.*ref-in-want" trace
 '
 
 test_expect_success 'fetching of missing objects from another promisor remote' '
@@ -316,7 +340,7 @@ test_expect_success 'rev-list stops traversal at missing and promised commit' '
 
 	git -C repo config core.repositoryformatversion 1 &&
 	git -C repo config extensions.partialclone "arbitrary string" &&
-	GIT_TEST_COMMIT_GRAPH=0 git -C repo -c core.commitGraph=false rev-list --exclude-promisor-objects --objects bar >out &&
+	git -C repo rev-list --exclude-promisor-objects --objects bar >out &&
 	grep $(git -C repo rev-parse bar) out &&
 	! grep $FOO out
 '
@@ -459,7 +483,7 @@ test_expect_success 'rev-list dies for missing objects on cmd line' '
 		git -C repo rev-list --ignore-missing --objects \
 			--exclude-promisor-objects "$OBJ" &&
 		git -C repo rev-list --ignore-missing --objects-edge-aggressive \
-			--exclude-promisor-objects "$OBJ"
+			--exclude-promisor-objects "$OBJ" || return 1
 	done
 '
 
@@ -533,7 +557,13 @@ test_expect_success 'gc does not repack promisor objects if there are none' '
 repack_and_check () {
 	rm -rf repo2 &&
 	cp -r repo repo2 &&
-	git -C repo2 repack $1 -d &&
+	if test x"$1" = "x--must-fail"
+	then
+		shift
+		test_must_fail git -C repo2 repack $1 -d
+	else
+		git -C repo2 repack $1 -d
+	fi &&
 	git -C repo2 fsck &&
 
 	git -C repo2 cat-file -e $2 &&
@@ -558,6 +588,7 @@ test_expect_success 'repack -d does not irreversibly delete promisor objects' '
 	printf "$THREE\n" | pack_as_from_promisor &&
 	delete_object repo "$ONE" &&
 
+	repack_and_check --must-fail -ab "$TWO" "$THREE" &&
 	repack_and_check -a "$TWO" "$THREE" &&
 	repack_and_check -A "$TWO" "$THREE" &&
 	repack_and_check -l "$TWO" "$THREE"
@@ -601,6 +632,63 @@ test_expect_success 'do not fetch when checking existence of tree we construct o
 	git -C repo cherry-pick side1
 '
 
+test_expect_success 'exact rename does not need to fetch the blob lazily' '
+	rm -rf repo partial.git &&
+	test_create_repo repo &&
+	content="some dummy content" &&
+	test_commit -C repo create-a-file file.txt "$content" &&
+	git -C repo mv file.txt new-file.txt &&
+	git -C repo commit -m rename-the-file &&
+	FILE_HASH=$(git -C repo rev-parse HEAD:new-file.txt) &&
+	test_config -C repo uploadpack.allowfilter 1 &&
+	test_config -C repo uploadpack.allowanysha1inwant 1 &&
+
+	git clone --filter=blob:none --bare "file://$(pwd)/repo" partial.git &&
+	git -C partial.git rev-list --objects --missing=print HEAD >out &&
+	grep "[?]$FILE_HASH" out &&
+	git -C partial.git log --follow -- new-file.txt &&
+	git -C partial.git rev-list --objects --missing=print HEAD >out &&
+	grep "[?]$FILE_HASH" out
+'
+
+test_expect_success 'lazy-fetch when accessing object not in the_repository' '
+	rm -rf full partial.git &&
+	test_create_repo full &&
+	test_commit -C full create-a-file file.txt &&
+
+	test_config -C full uploadpack.allowfilter 1 &&
+	test_config -C full uploadpack.allowanysha1inwant 1 &&
+	git clone --filter=blob:none --bare "file://$(pwd)/full" partial.git &&
+	FILE_HASH=$(git -C full rev-parse HEAD:file.txt) &&
+
+	# Sanity check that the file is missing
+	git -C partial.git rev-list --objects --missing=print HEAD >out &&
+	grep "[?]$FILE_HASH" out &&
+
+	# The no-lazy-fetch mechanism prevents Git from fetching
+	test_must_fail env GIT_NO_LAZY_FETCH=1 \
+		git -C partial.git cat-file -e "$FILE_HASH" &&
+
+	# The same with command line option to "git"
+	test_must_fail git --no-lazy-fetch -C partial.git cat-file -e "$FILE_HASH" &&
+
+	# The same, forcing a subprocess via an alias
+	test_must_fail git --no-lazy-fetch -C partial.git \
+		-c alias.foo="!git cat-file" foo -e "$FILE_HASH" &&
+
+	# Sanity check that the file is still missing
+	git -C partial.git rev-list --objects --missing=print HEAD >out &&
+	grep "[?]$FILE_HASH" out &&
+
+	git -C full cat-file -s "$FILE_HASH" >expect &&
+	test-tool partial-clone object-info partial.git "$FILE_HASH" >actual &&
+	test_cmp expect actual &&
+
+	# Sanity check that the file is now present
+	git -C partial.git rev-list --objects --missing=print HEAD >out &&
+	! grep "[?]$FILE_HASH" out
+'
+
 . "$TEST_DIRECTORY"/lib-httpd.sh
 start_httpd
 
diff --git a/t/t0450-txt-doc-vs-help.sh b/t/t0450-txt-doc-vs-help.sh
new file mode 100755
index 0000000..69917d7
--- /dev/null
+++ b/t/t0450-txt-doc-vs-help.sh
@@ -0,0 +1,174 @@
+#!/bin/sh
+
+test_description='assert (unbuilt) Documentation/*.txt and -h output
+
+Run this with --debug to see a summary of where we still fail to make
+the two versions consistent with one another.'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+test_expect_success 'setup: list of builtins' '
+	git --list-cmds=builtins >builtins
+'
+
+test_expect_success 'list of txt and help mismatches is sorted' '
+	sort -u "$TEST_DIRECTORY"/t0450/txt-help-mismatches >expect &&
+	if ! test_cmp expect "$TEST_DIRECTORY"/t0450/txt-help-mismatches
+	then
+		BUG "please keep the list of txt and help mismatches sorted"
+	fi
+'
+
+help_to_synopsis () {
+	builtin="$1" &&
+	out_dir="out/$builtin" &&
+	out="$out_dir/help.synopsis" &&
+	if test -f "$out"
+	then
+		echo "$out" &&
+		return 0
+	fi &&
+	mkdir -p "$out_dir" &&
+	test_expect_code 129 git $builtin -h >"$out.raw" 2>&1 &&
+	sed -n \
+		-e '1,/^$/ {
+			/^$/d;
+			s/^usage: //;
+			s/^ *or: //;
+			p;
+		}' <"$out.raw" >"$out" &&
+	echo "$out"
+}
+
+builtin_to_txt () {
+       echo "$GIT_BUILD_DIR/Documentation/git-$1.txt"
+}
+
+txt_to_synopsis () {
+	builtin="$1" &&
+	out_dir="out/$builtin" &&
+	out="$out_dir/txt.synopsis" &&
+	if test -f "$out"
+	then
+		echo "$out" &&
+		return 0
+	fi &&
+	b2t="$(builtin_to_txt "$builtin")" &&
+	sed -n \
+		-e '/^\[verse\]$/,/^$/ {
+			/^$/d;
+			/^\[verse\]$/d;
+			s/_//g;
+			s/++//g;
+			s/`//g;
+			s/{litdd}/--/g;
+			s/'\''\(git[ a-z-]*\)'\''/\1/g;
+
+			p;
+		}' \
+		<"$b2t" >"$out" &&
+	echo "$out"
+}
+
+check_dashed_labels () {
+	! grep -E "<[^>_-]+_" "$1"
+}
+
+HT="	"
+
+align_after_nl () {
+	builtin="$1" &&
+	len=$(printf "git %s " "$builtin" | wc -c) &&
+	pad=$(printf "%${len}s" "") &&
+
+	sed "s/^[ $HT][ $HT]*/$pad/"
+}
+
+test_debug '>failing'
+while read builtin
+do
+	# -h output assertions
+	test_expect_success "$builtin -h output has no \t" '
+		h2s="$(help_to_synopsis "$builtin")" &&
+		! grep "$HT" "$h2s"
+	'
+
+	test_expect_success "$builtin -h output has dashed labels" '
+		check_dashed_labels "$(help_to_synopsis "$builtin")"
+	'
+
+	test_expect_success "$builtin -h output has consistent spacing" '
+		h2s="$(help_to_synopsis "$builtin")" &&
+		sed -n \
+			-e "/^ / {
+				s/[^ ].*//;
+				p;
+			}" \
+			<"$h2s" >help &&
+		sort -u help >help.ws &&
+		if test -s help.ws
+		then
+			test_line_count = 1 help.ws
+		fi
+	'
+
+	txt="$(builtin_to_txt "$builtin")" &&
+	preq="$(echo BUILTIN_TXT_$builtin | tr '[:lower:]-' '[:upper:]_')" &&
+
+	if test -f "$txt"
+	then
+		test_set_prereq "$preq"
+	fi &&
+
+	# *.txt output assertions
+	test_expect_success "$preq" "$builtin *.txt SYNOPSIS has dashed labels" '
+		check_dashed_labels "$(txt_to_synopsis "$builtin")"
+	'
+
+	# *.txt output consistency assertions
+	result=
+	if grep -q "^$builtin$" "$TEST_DIRECTORY"/t0450/txt-help-mismatches
+	then
+		result=failure
+	else
+		result=success
+	fi &&
+	test_expect_$result "$preq" "$builtin -h output and SYNOPSIS agree" '
+		t2s="$(txt_to_synopsis "$builtin")" &&
+		if test "$builtin" = "merge-tree"
+		then
+			test_when_finished "rm -f t2s.new" &&
+			sed -e '\''s/ (deprecated)$//g'\'' <"$t2s" >t2s.new
+			t2s=t2s.new
+		fi &&
+		h2s="$(help_to_synopsis "$builtin")" &&
+
+		# The *.txt and -h use different spacing for the
+		# alignment of continued usage output, normalize it.
+		align_after_nl "$builtin" <"$t2s" >txt &&
+		align_after_nl "$builtin" <"$h2s" >help &&
+		test_cmp txt help
+	'
+
+	if test_have_prereq "$preq" && test -e txt && test -e help
+	then
+		test_debug '
+			if test_cmp txt help >cmp 2>/dev/null
+			then
+				echo "=== DONE: $builtin ==="
+			else
+				echo "=== TODO: $builtin ===" &&
+				cat cmp
+			fi >>failing
+		'
+
+		# Not in test_expect_success in case --run is being
+		# used with --debug
+		rm -f txt help tmp 2>/dev/null
+	fi
+done <builtins
+
+test_debug 'say "$(cat failing)"'
+
+test_done
diff --git a/t/t0450/txt-help-mismatches b/t/t0450/txt-help-mismatches
new file mode 100644
index 0000000..a0777ac
--- /dev/null
+++ b/t/t0450/txt-help-mismatches
@@ -0,0 +1,58 @@
+add
+am
+apply
+archive
+bisect
+blame
+branch
+check-ref-format
+checkout
+checkout-index
+clone
+column
+config
+credential
+credential-cache
+credential-store
+fast-export
+fast-import
+fetch-pack
+fmt-merge-msg
+for-each-ref
+format-patch
+fsck-objects
+fsmonitor--daemon
+gc
+grep
+index-pack
+init-db
+log
+ls-files
+ls-tree
+mailinfo
+mailsplit
+maintenance
+merge
+merge-file
+merge-index
+merge-one-file
+multi-pack-index
+name-rev
+notes
+pack-objects
+push
+range-diff
+rebase
+remote
+remote-ext
+remote-fd
+repack
+reset
+restore
+rev-parse
+show
+stage
+switch
+update-index
+update-ref
+whatchanged
diff --git a/t/t0500-progress-display.sh b/t/t0500-progress-display.sh
index 1ed1df3..1eb3a83 100755
--- a/t/t0500-progress-display.sh
+++ b/t/t0500-progress-display.sh
@@ -2,6 +2,7 @@
 
 test_description='progress display'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 show_cr () {
@@ -17,6 +18,7 @@ test_expect_success 'simple progress display' '
 	EOF
 
 	cat >in <<-\EOF &&
+	start 0
 	update
 	progress 1
 	update
@@ -25,11 +27,12 @@ test_expect_success 'simple progress display' '
 	progress 4
 	update
 	progress 5
+	stop
 	EOF
-	test-tool progress "Working hard" <in 2>stderr &&
+	test-tool progress <in 2>stderr &&
 
 	show_cr <stderr >out &&
-	test_i18ncmp expect out
+	test_cmp expect out
 '
 
 test_expect_success 'progress display with total' '
@@ -41,14 +44,16 @@ test_expect_success 'progress display with total' '
 	EOF
 
 	cat >in <<-\EOF &&
+	start 3
 	progress 1
 	progress 2
 	progress 3
+	stop
 	EOF
-	test-tool progress --total=3 "Working hard" <in 2>stderr &&
+	test-tool progress <in 2>stderr &&
 
 	show_cr <stderr >out &&
-	test_i18ncmp expect out
+	test_cmp expect out
 '
 
 test_expect_success 'progress display breaks long lines #1' '
@@ -62,17 +67,17 @@ Working hard.......2.........3.........4.........5.........6:
 EOF
 
 	cat >in <<-\EOF &&
+	start 100000 Working hard.......2.........3.........4.........5.........6
 	progress 100
 	progress 1000
 	progress 10000
 	progress 100000
+	stop
 	EOF
-	test-tool progress --total=100000 \
-		"Working hard.......2.........3.........4.........5.........6" \
-		<in 2>stderr &&
+	test-tool progress <in 2>stderr &&
 
 	show_cr <stderr >out &&
-	test_i18ncmp expect out
+	test_cmp expect out
 '
 
 test_expect_success 'progress display breaks long lines #2' '
@@ -88,19 +93,19 @@ Working hard.......2.........3.........4.........5.........6:
 EOF
 
 	cat >in <<-\EOF &&
+	start 100000 Working hard.......2.........3.........4.........5.........6
 	update
 	progress 1
 	update
 	progress 2
 	progress 10000
 	progress 100000
+	stop
 	EOF
-	test-tool progress --total=100000 \
-		"Working hard.......2.........3.........4.........5.........6" \
-		<in 2>stderr &&
+	test-tool progress <in 2>stderr &&
 
 	show_cr <stderr >out &&
-	test_i18ncmp expect out
+	test_cmp expect out
 '
 
 test_expect_success 'progress display breaks long lines #3 - even the first is too long' '
@@ -116,17 +121,17 @@ Working hard.......2.........3.........4.........5.........6:
 EOF
 
 	cat >in <<-\EOF &&
+	start 100000 Working hard.......2.........3.........4.........5.........6
 	progress 25000
 	progress 50000
 	progress 75000
 	progress 100000
+	stop
 	EOF
-	test-tool progress --total=100000 \
-		"Working hard.......2.........3.........4.........5.........6" \
-		<in 2>stderr &&
+	test-tool progress <in 2>stderr &&
 
 	show_cr <stderr >out &&
-	test_i18ncmp expect out
+	test_cmp expect out
 '
 
 test_expect_success 'progress display breaks long lines #4 - title line matches terminal width' '
@@ -140,17 +145,17 @@ Working hard.......2.........3.........4.........5.........6.........7.........:
 EOF
 
 	cat >in <<-\EOF &&
+	start 100000 Working hard.......2.........3.........4.........5.........6.........7.........
 	progress 25000
 	progress 50000
 	progress 75000
 	progress 100000
+	stop
 	EOF
-	test-tool progress --total=100000 \
-		"Working hard.......2.........3.........4.........5.........6.........7........." \
-		<in 2>stderr &&
+	test-tool progress <in 2>stderr &&
 
 	show_cr <stderr >out &&
-	test_i18ncmp expect out
+	test_cmp expect out
 '
 
 # Progress counter goes backwards, this should not happen in practice.
@@ -164,15 +169,17 @@ test_expect_success 'progress shortens - crazy caller' '
 	EOF
 
 	cat >in <<-\EOF &&
+	start 1000
 	progress 100
 	progress 200
 	progress 1
 	progress 1000
+	stop
 	EOF
-	test-tool progress --total=1000 "Working hard" <in 2>stderr &&
+	test-tool progress <in 2>stderr &&
 
 	show_cr <stderr >out &&
-	test_i18ncmp expect out
+	test_cmp expect out
 '
 
 test_expect_success 'progress display with throughput' '
@@ -185,6 +192,7 @@ test_expect_success 'progress display with throughput' '
 	EOF
 
 	cat >in <<-\EOF &&
+	start 0
 	throughput 102400 1000
 	update
 	progress 10
@@ -197,11 +205,12 @@ test_expect_success 'progress display with throughput' '
 	throughput 409600 4000
 	update
 	progress 40
+	stop
 	EOF
-	test-tool progress "Working hard" <in 2>stderr &&
+	test-tool progress <in 2>stderr &&
 
 	show_cr <stderr >out &&
-	test_i18ncmp expect out
+	test_cmp expect out
 '
 
 test_expect_success 'progress display with throughput and total' '
@@ -214,6 +223,7 @@ test_expect_success 'progress display with throughput and total' '
 	EOF
 
 	cat >in <<-\EOF &&
+	start 40
 	throughput 102400 1000
 	progress 10
 	throughput 204800 2000
@@ -222,11 +232,12 @@ test_expect_success 'progress display with throughput and total' '
 	progress 30
 	throughput 409600 4000
 	progress 40
+	stop
 	EOF
-	test-tool progress --total=40 "Working hard" <in 2>stderr &&
+	test-tool progress <in 2>stderr &&
 
 	show_cr <stderr >out &&
-	test_i18ncmp expect out
+	test_cmp expect out
 '
 
 test_expect_success 'cover up after throughput shortens' '
@@ -239,6 +250,7 @@ test_expect_success 'cover up after throughput shortens' '
 	EOF
 
 	cat >in <<-\EOF &&
+	start 0
 	throughput 409600 1000
 	update
 	progress 1
@@ -251,11 +263,12 @@ test_expect_success 'cover up after throughput shortens' '
 	throughput 1638400 4000
 	update
 	progress 4
+	stop
 	EOF
-	test-tool progress "Working hard" <in 2>stderr &&
+	test-tool progress <in 2>stderr &&
 
 	show_cr <stderr >out &&
-	test_i18ncmp expect out
+	test_cmp expect out
 '
 
 test_expect_success 'cover up after throughput shortens a lot' '
@@ -267,6 +280,7 @@ test_expect_success 'cover up after throughput shortens a lot' '
 	EOF
 
 	cat >in <<-\EOF &&
+	start 0
 	throughput 1 1000
 	update
 	progress 1
@@ -276,15 +290,17 @@ test_expect_success 'cover up after throughput shortens a lot' '
 	throughput 3145728 3000
 	update
 	progress 3
+	stop
 	EOF
-	test-tool progress "Working hard" <in 2>stderr &&
+	test-tool progress <in 2>stderr &&
 
 	show_cr <stderr >out &&
-	test_i18ncmp expect out
+	test_cmp expect out
 '
 
 test_expect_success 'progress generates traces' '
 	cat >in <<-\EOF &&
+	start 40
 	throughput 102400 1000
 	update
 	progress 10
@@ -297,16 +313,66 @@ test_expect_success 'progress generates traces' '
 	throughput 409600 4000
 	update
 	progress 40
+	stop
 	EOF
 
-	GIT_TRACE2_EVENT="$(pwd)/trace.event" test-tool progress --total=40 \
-		"Working hard" <in 2>stderr &&
+	GIT_TRACE2_EVENT="$(pwd)/trace.event" test-tool progress \
+		<in 2>stderr &&
 
 	# t0212/parse_events.perl intentionally omits regions and data.
-	grep -e "region_enter" -e "\"category\":\"progress\"" trace.event &&
-	grep -e "region_leave" -e "\"category\":\"progress\"" trace.event &&
+	test_region progress "Working hard" trace.event &&
 	grep "\"key\":\"total_objects\",\"value\":\"40\"" trace.event &&
 	grep "\"key\":\"total_bytes\",\"value\":\"409600\"" trace.event
 '
 
+test_expect_success 'progress generates traces: stop / start' '
+	cat >in <<-\EOF &&
+	start 0
+	stop
+	EOF
+
+	GIT_TRACE2_EVENT="$PWD/trace-startstop.event" test-tool progress \
+		<in 2>stderr &&
+	test_region progress "Working hard" trace-startstop.event
+'
+
+test_expect_success 'progress generates traces: start without stop' '
+	cat >in <<-\EOF &&
+	start 0
+	EOF
+
+	GIT_TRACE2_EVENT="$PWD/trace-start.event" \
+	LSAN_OPTIONS=detect_leaks=0 \
+	test-tool progress \
+		<in 2>stderr &&
+	grep region_enter.*progress trace-start.event &&
+	! grep region_leave.*progress trace-start.event
+'
+
+test_expect_success 'progress generates traces: stop without start' '
+	cat >in <<-\EOF &&
+	stop
+	EOF
+
+	GIT_TRACE2_EVENT="$PWD/trace-stop.event" test-tool progress \
+		<in 2>stderr &&
+	! grep region_enter.*progress trace-stop.event &&
+	! grep region_leave.*progress trace-stop.event
+'
+
+test_expect_success 'progress generates traces: start with active progress bar (no stops)' '
+	cat >in <<-\EOF &&
+	start 0 One
+	start 0 Two
+	EOF
+
+	GIT_TRACE2_EVENT="$PWD/trace-2start.event" \
+	LSAN_OPTIONS=detect_leaks=0 \
+	test-tool progress \
+		<in 2>stderr &&
+	grep region_enter.*progress.*One trace-2start.event &&
+	grep region_enter.*progress.*Two trace-2start.event &&
+	! grep region_leave trace-2start.event
+'
+
 test_done
diff --git a/t/t0600-reffiles-backend.sh b/t/t0600-reffiles-backend.sh
new file mode 100755
index 0000000..6421434
--- /dev/null
+++ b/t/t0600-reffiles-backend.sh
@@ -0,0 +1,475 @@
+#!/bin/sh
+
+test_description='Test reffiles backend'
+
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+if ! test_have_prereq REFFILES
+then
+	skip_all='skipping reffiles specific tests'
+	test_done
+fi
+
+test_expect_success 'setup' '
+	git commit --allow-empty -m Initial &&
+	C=$(git rev-parse HEAD) &&
+	git commit --allow-empty -m Second &&
+	D=$(git rev-parse HEAD) &&
+	git commit --allow-empty -m Third &&
+	E=$(git rev-parse HEAD)
+'
+
+test_expect_success 'empty directory should not fool rev-parse' '
+	prefix=refs/e-rev-parse &&
+	git update-ref $prefix/foo $C &&
+	git pack-refs --all &&
+	mkdir -p .git/$prefix/foo/bar/baz &&
+	echo "$C" >expected &&
+	git rev-parse $prefix/foo >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'empty directory should not fool for-each-ref' '
+	prefix=refs/e-for-each-ref &&
+	git update-ref $prefix/foo $C &&
+	git for-each-ref $prefix >expected &&
+	git pack-refs --all &&
+	mkdir -p .git/$prefix/foo/bar/baz &&
+	git for-each-ref $prefix >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'empty directory should not fool create' '
+	prefix=refs/e-create &&
+	mkdir -p .git/$prefix/foo/bar/baz &&
+	printf "create %s $C\n" $prefix/foo |
+	git update-ref --stdin
+'
+
+test_expect_success 'empty directory should not fool verify' '
+	prefix=refs/e-verify &&
+	git update-ref $prefix/foo $C &&
+	git pack-refs --all &&
+	mkdir -p .git/$prefix/foo/bar/baz &&
+	printf "verify %s $C\n" $prefix/foo |
+	git update-ref --stdin
+'
+
+test_expect_success 'empty directory should not fool 1-arg update' '
+	prefix=refs/e-update-1 &&
+	git update-ref $prefix/foo $C &&
+	git pack-refs --all &&
+	mkdir -p .git/$prefix/foo/bar/baz &&
+	printf "update %s $D\n" $prefix/foo |
+	git update-ref --stdin
+'
+
+test_expect_success 'empty directory should not fool 2-arg update' '
+	prefix=refs/e-update-2 &&
+	git update-ref $prefix/foo $C &&
+	git pack-refs --all &&
+	mkdir -p .git/$prefix/foo/bar/baz &&
+	printf "update %s $D $C\n" $prefix/foo |
+	git update-ref --stdin
+'
+
+test_expect_success 'empty directory should not fool 0-arg delete' '
+	prefix=refs/e-delete-0 &&
+	git update-ref $prefix/foo $C &&
+	git pack-refs --all &&
+	mkdir -p .git/$prefix/foo/bar/baz &&
+	printf "delete %s\n" $prefix/foo |
+	git update-ref --stdin
+'
+
+test_expect_success 'empty directory should not fool 1-arg delete' '
+	prefix=refs/e-delete-1 &&
+	git update-ref $prefix/foo $C &&
+	git pack-refs --all &&
+	mkdir -p .git/$prefix/foo/bar/baz &&
+	printf "delete %s $C\n" $prefix/foo |
+	git update-ref --stdin
+'
+
+test_expect_success 'non-empty directory blocks create' '
+	prefix=refs/ne-create &&
+	mkdir -p .git/$prefix/foo/bar &&
+	: >.git/$prefix/foo/bar/baz.lock &&
+	test_when_finished "rm -f .git/$prefix/foo/bar/baz.lock" &&
+	cat >expected <<-EOF &&
+	fatal: cannot lock ref $SQ$prefix/foo$SQ: there is a non-empty directory $SQ.git/$prefix/foo$SQ blocking reference $SQ$prefix/foo$SQ
+	EOF
+	printf "%s\n" "update $prefix/foo $C" |
+	test_must_fail git update-ref --stdin 2>output.err &&
+	test_cmp expected output.err &&
+	cat >expected <<-EOF &&
+	fatal: cannot lock ref $SQ$prefix/foo$SQ: unable to resolve reference $SQ$prefix/foo$SQ
+	EOF
+	printf "%s\n" "update $prefix/foo $D $C" |
+	test_must_fail git update-ref --stdin 2>output.err &&
+	test_cmp expected output.err
+'
+
+test_expect_success 'broken reference blocks create' '
+	prefix=refs/broken-create &&
+	mkdir -p .git/$prefix &&
+	echo "gobbledigook" >.git/$prefix/foo &&
+	test_when_finished "rm -f .git/$prefix/foo" &&
+	cat >expected <<-EOF &&
+	fatal: cannot lock ref $SQ$prefix/foo$SQ: unable to resolve reference $SQ$prefix/foo$SQ: reference broken
+	EOF
+	printf "%s\n" "update $prefix/foo $C" |
+	test_must_fail git update-ref --stdin 2>output.err &&
+	test_cmp expected output.err &&
+	cat >expected <<-EOF &&
+	fatal: cannot lock ref $SQ$prefix/foo$SQ: unable to resolve reference $SQ$prefix/foo$SQ: reference broken
+	EOF
+	printf "%s\n" "update $prefix/foo $D $C" |
+	test_must_fail git update-ref --stdin 2>output.err &&
+	test_cmp expected output.err
+'
+
+test_expect_success 'non-empty directory blocks indirect create' '
+	prefix=refs/ne-indirect-create &&
+	git symbolic-ref $prefix/symref $prefix/foo &&
+	mkdir -p .git/$prefix/foo/bar &&
+	: >.git/$prefix/foo/bar/baz.lock &&
+	test_when_finished "rm -f .git/$prefix/foo/bar/baz.lock" &&
+	cat >expected <<-EOF &&
+	fatal: cannot lock ref $SQ$prefix/symref$SQ: there is a non-empty directory $SQ.git/$prefix/foo$SQ blocking reference $SQ$prefix/foo$SQ
+	EOF
+	printf "%s\n" "update $prefix/symref $C" |
+	test_must_fail git update-ref --stdin 2>output.err &&
+	test_cmp expected output.err &&
+	cat >expected <<-EOF &&
+	fatal: cannot lock ref $SQ$prefix/symref$SQ: unable to resolve reference $SQ$prefix/foo$SQ
+	EOF
+	printf "%s\n" "update $prefix/symref $D $C" |
+	test_must_fail git update-ref --stdin 2>output.err &&
+	test_cmp expected output.err
+'
+
+test_expect_success 'broken reference blocks indirect create' '
+	prefix=refs/broken-indirect-create &&
+	git symbolic-ref $prefix/symref $prefix/foo &&
+	echo "gobbledigook" >.git/$prefix/foo &&
+	test_when_finished "rm -f .git/$prefix/foo" &&
+	cat >expected <<-EOF &&
+	fatal: cannot lock ref $SQ$prefix/symref$SQ: unable to resolve reference $SQ$prefix/foo$SQ: reference broken
+	EOF
+	printf "%s\n" "update $prefix/symref $C" |
+	test_must_fail git update-ref --stdin 2>output.err &&
+	test_cmp expected output.err &&
+	cat >expected <<-EOF &&
+	fatal: cannot lock ref $SQ$prefix/symref$SQ: unable to resolve reference $SQ$prefix/foo$SQ: reference broken
+	EOF
+	printf "%s\n" "update $prefix/symref $D $C" |
+	test_must_fail git update-ref --stdin 2>output.err &&
+	test_cmp expected output.err
+'
+
+test_expect_success 'no bogus intermediate values during delete' '
+	prefix=refs/slow-transaction &&
+	# Set up a reference with differing loose and packed versions:
+	git update-ref $prefix/foo $C &&
+	git pack-refs --all &&
+	git update-ref $prefix/foo $D &&
+	# Now try to update the reference, but hold the `packed-refs` lock
+	# for a while to see what happens while the process is blocked:
+	: >.git/packed-refs.lock &&
+	test_when_finished "rm -f .git/packed-refs.lock" &&
+	{
+		# Note: the following command is intentionally run in the
+		# background. We increase the timeout so that `update-ref`
+		# attempts to acquire the `packed-refs` lock for much longer
+		# than it takes for us to do the check then delete it:
+		git -c core.packedrefstimeout=30000 update-ref -d $prefix/foo &
+	} &&
+	pid2=$! &&
+	# Give update-ref plenty of time to get to the point where it tries
+	# to lock packed-refs:
+	sleep 1 &&
+	# Make sure that update-ref did not complete despite the lock:
+	kill -0 $pid2 &&
+	# Verify that the reference still has its old value:
+	sha1=$(git rev-parse --verify --quiet $prefix/foo || echo undefined) &&
+	case "$sha1" in
+	$D)
+		# This is what we hope for; it means that nothing
+		# user-visible has changed yet.
+		: ;;
+	undefined)
+		# This is not correct; it means the deletion has happened
+		# already even though update-ref should not have been
+		# able to acquire the lock yet.
+		echo "$prefix/foo deleted prematurely" &&
+		break
+		;;
+	$C)
+		# This value should never be seen. Probably the loose
+		# reference has been deleted but the packed reference
+		# is still there:
+		echo "$prefix/foo incorrectly observed to be C" &&
+		break
+		;;
+	*)
+		# WTF?
+		echo "unexpected value observed for $prefix/foo: $sha1" &&
+		break
+		;;
+	esac >out &&
+	rm -f .git/packed-refs.lock &&
+	wait $pid2 &&
+	test_must_be_empty out &&
+	test_must_fail git rev-parse --verify --quiet $prefix/foo
+'
+
+test_expect_success 'delete fails cleanly if packed-refs file is locked' '
+	prefix=refs/locked-packed-refs &&
+	# Set up a reference with differing loose and packed versions:
+	git update-ref $prefix/foo $C &&
+	git pack-refs --all &&
+	git update-ref $prefix/foo $D &&
+	git for-each-ref $prefix >unchanged &&
+	# Now try to delete it while the `packed-refs` lock is held:
+	: >.git/packed-refs.lock &&
+	test_when_finished "rm -f .git/packed-refs.lock" &&
+	test_must_fail git update-ref -d $prefix/foo >out 2>err &&
+	git for-each-ref $prefix >actual &&
+	test_grep "Unable to create $SQ.*packed-refs.lock$SQ: " err &&
+	test_cmp unchanged actual
+'
+
+test_expect_success 'delete fails cleanly if packed-refs.new write fails' '
+	# Setup and expectations are similar to the test above.
+	prefix=refs/failed-packed-refs &&
+	git update-ref $prefix/foo $C &&
+	git pack-refs --all &&
+	git update-ref $prefix/foo $D &&
+	git for-each-ref $prefix >unchanged &&
+	# This should not happen in practice, but it is an easy way to get a
+	# reliable error (we open with create_tempfile(), which uses O_EXCL).
+	: >.git/packed-refs.new &&
+	test_when_finished "rm -f .git/packed-refs.new" &&
+	test_must_fail git update-ref -d $prefix/foo &&
+	git for-each-ref $prefix >actual &&
+	test_cmp unchanged actual
+'
+
+RWT="test-tool ref-store worktree:wt"
+RMAIN="test-tool ref-store worktree:main"
+
+test_expect_success 'setup worktree' '
+	test_commit first &&
+	git worktree add -b wt-main wt &&
+	(
+		cd wt &&
+		test_commit second
+	)
+'
+
+# Some refs (refs/bisect/*, pseudorefs) are kept per worktree, so they should
+# only appear in the for-each-reflog output if it is called from the correct
+# worktree, which is exercised in this test. This test is poorly written for
+# mulitple reasons: 1) it creates invalidly formatted log entres. 2) it uses
+# direct FS access for creating the reflogs. 3) PSEUDO-WT and refs/bisect/random
+# do not create reflogs by default, so it is not testing a realistic scenario.
+test_expect_success 'for_each_reflog()' '
+	echo $ZERO_OID >.git/logs/PSEUDO_MAIN_HEAD &&
+	mkdir -p     .git/logs/refs/bisect &&
+	echo $ZERO_OID >.git/logs/refs/bisect/random &&
+
+	echo $ZERO_OID >.git/worktrees/wt/logs/PSEUDO_WT_HEAD &&
+	mkdir -p     .git/worktrees/wt/logs/refs/bisect &&
+	echo $ZERO_OID >.git/worktrees/wt/logs/refs/bisect/wt-random &&
+
+	$RWT for-each-reflog >actual &&
+	cat >expected <<-\EOF &&
+	HEAD
+	PSEUDO_WT_HEAD
+	refs/bisect/wt-random
+	refs/heads/main
+	refs/heads/wt-main
+	EOF
+	test_cmp expected actual &&
+
+	$RMAIN for-each-reflog >actual &&
+	cat >expected <<-\EOF &&
+	HEAD
+	PSEUDO_MAIN_HEAD
+	refs/bisect/random
+	refs/heads/main
+	refs/heads/wt-main
+	EOF
+	test_cmp expected actual
+'
+
+# Triggering the bug detected by this test requires a newline to fall
+# exactly BUFSIZ-1 bytes from the end of the file. We don't know
+# what that value is, since it's platform dependent. However, if
+# we choose some value N, we also catch any D which divides N evenly
+# (since we will read backwards in chunks of D). So we choose 8K,
+# which catches glibc (with an 8K BUFSIZ) and *BSD (1K).
+#
+# Each line is 114 characters, so we need 75 to still have a few before the
+# last 8K. The 89-character padding on the final entry lines up our
+# newline exactly.
+test_expect_success SHA1 'parsing reverse reflogs at BUFSIZ boundaries' '
+	git checkout -b reflogskip &&
+	zf=$(test_oid zero_2) &&
+	ident="abc <xyz> 0000000001 +0000" &&
+	for i in $(test_seq 1 75); do
+		printf "$zf%02d $zf%02d %s\t" $i $(($i+1)) "$ident" &&
+		if test $i = 75; then
+			for j in $(test_seq 1 89); do
+				printf X || return 1
+			done
+		else
+			printf X
+		fi &&
+		printf "\n" || return 1
+	done >.git/logs/refs/heads/reflogskip &&
+	git rev-parse reflogskip@{73} >actual &&
+	echo ${zf}03 >expect &&
+	test_cmp expect actual
+'
+
+# This test takes a lock on an individual ref; this is not supported in
+# reftable.
+test_expect_success 'reflog expire operates on symref not referrent' '
+	git branch --create-reflog the_symref &&
+	git branch --create-reflog referrent &&
+	git update-ref referrent HEAD &&
+	git symbolic-ref refs/heads/the_symref refs/heads/referrent &&
+	test_when_finished "rm -f .git/refs/heads/referrent.lock" &&
+	touch .git/refs/heads/referrent.lock &&
+	git reflog expire --expire=all the_symref
+'
+
+test_expect_success 'empty reflog' '
+	test_when_finished "rm -rf empty" &&
+	git init empty &&
+	test_commit -C empty A &&
+	>empty/.git/logs/refs/heads/foo &&
+	git -C empty reflog expire --all 2>err &&
+	test_must_be_empty err
+'
+
+test_expect_success SYMLINKS 'ref resolution not confused by broken symlinks' '
+       ln -s does-not-exist .git/refs/heads/broken &&
+       test_must_fail git rev-parse --verify broken
+'
+
+test_expect_success 'log diagnoses bogus HEAD hash' '
+	git init empty &&
+	test_when_finished "rm -rf empty" &&
+	echo 1234abcd >empty/.git/refs/heads/main &&
+	test_must_fail git -C empty log 2>stderr &&
+	test_grep broken stderr
+'
+
+test_expect_success 'log diagnoses bogus HEAD symref' '
+	git init empty &&
+	test-tool -C empty ref-store main create-symref HEAD refs/heads/invalid.lock &&
+	test_must_fail git -C empty log 2>stderr &&
+	test_grep broken stderr &&
+	test_must_fail git -C empty log --default totally-bogus 2>stderr &&
+	test_grep broken stderr
+'
+
+test_expect_success 'empty directory removal' '
+	git branch d1/d2/r1 HEAD &&
+	git branch d1/r2 HEAD &&
+	test_path_is_file .git/refs/heads/d1/d2/r1 &&
+	test_path_is_file .git/logs/refs/heads/d1/d2/r1 &&
+	git branch -d d1/d2/r1 &&
+	test_must_fail git show-ref --verify -q refs/heads/d1/d2 &&
+	test_must_fail git show-ref --verify -q logs/refs/heads/d1/d2 &&
+	test_path_is_file .git/refs/heads/d1/r2 &&
+	test_path_is_file .git/logs/refs/heads/d1/r2
+'
+
+test_expect_success 'symref empty directory removal' '
+	git branch e1/e2/r1 HEAD &&
+	git branch e1/r2 HEAD &&
+	git checkout e1/e2/r1 &&
+	test_when_finished "git checkout main" &&
+	test_path_is_file .git/refs/heads/e1/e2/r1 &&
+	test_path_is_file .git/logs/refs/heads/e1/e2/r1 &&
+	git update-ref -d HEAD &&
+	test_must_fail git show-ref --verify -q refs/heads/e1/e2 &&
+	test_must_fail git show-ref --verify -q logs/refs/heads/e1/e2 &&
+	test_path_is_file .git/refs/heads/e1/r2 &&
+	test_path_is_file .git/logs/refs/heads/e1/r2 &&
+	test_path_is_file .git/logs/HEAD
+'
+
+test_expect_success 'directory not created deleting packed ref' '
+	git branch d1/d2/r1 HEAD &&
+	git pack-refs --all &&
+	test_path_is_missing .git/refs/heads/d1/d2 &&
+	git update-ref -d refs/heads/d1/d2/r1 &&
+	test_path_is_missing .git/refs/heads/d1/d2 &&
+	test_path_is_missing .git/refs/heads/d1
+'
+
+test_expect_success SYMLINKS 'git branch -m u v should fail when the reflog for u is a symlink' '
+	git branch --create-reflog u &&
+	mv .git/logs/refs/heads/u real-u &&
+	ln -s real-u .git/logs/refs/heads/u &&
+	test_must_fail git branch -m u v
+'
+
+test_expect_success SYMLINKS 'git branch -m with symlinked .git/refs' '
+	test_when_finished "rm -rf subdir" &&
+	git init --bare subdir &&
+
+	rm -rfv subdir/refs subdir/objects subdir/packed-refs &&
+	ln -s ../.git/refs subdir/refs &&
+	ln -s ../.git/objects subdir/objects &&
+	ln -s ../.git/packed-refs subdir/packed-refs &&
+
+	git -C subdir rev-parse --absolute-git-dir >subdir.dir &&
+	git rev-parse --absolute-git-dir >our.dir &&
+	! test_cmp subdir.dir our.dir &&
+
+	git -C subdir log &&
+	git -C subdir branch rename-src &&
+	git rev-parse rename-src >expect &&
+	git -C subdir branch -m rename-src rename-dest &&
+	git rev-parse rename-dest >actual &&
+	test_cmp expect actual &&
+	git branch -D rename-dest
+'
+
+test_expect_success MINGW,SYMLINKS_WINDOWS 'rebase when .git/logs is a symlink' '
+	git checkout main &&
+	mv .git/logs actual_logs &&
+	cmd //c "mklink /D .git\logs ..\actual_logs" &&
+	git rebase -f HEAD^ &&
+	test -L .git/logs &&
+	rm .git/logs &&
+	mv actual_logs .git/logs
+'
+
+test_expect_success POSIXPERM 'git reflog expire honors core.sharedRepository' '
+	umask 077 &&
+	git config core.sharedRepository group &&
+	git reflog expire --all &&
+	actual="$(ls -l .git/logs/refs/heads/main)" &&
+	case "$actual" in
+	-rw-rw-*)
+		: happy
+		;;
+	*)
+		echo Ooops, .git/logs/refs/heads/main is not 066x [$actual]
+		false
+		;;
+	esac
+'
+
+test_done
diff --git a/t/t0601-reffiles-pack-refs.sh b/t/t0601-reffiles-pack-refs.sh
new file mode 100755
index 0000000..7d4ab0b
--- /dev/null
+++ b/t/t0601-reffiles-pack-refs.sh
@@ -0,0 +1,383 @@
+#!/bin/sh
+#
+# Copyright (c) 2005 Amos Waterland
+# Copyright (c) 2006 Christian Couder
+#
+
+test_description='git pack-refs should not change the branch semantic
+
+This test runs git pack-refs and git show-ref and checks that the branch
+semantic is still the same.
+'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+if ! test_have_prereq REFFILES
+then
+	skip_all='skipping reffiles specific tests'
+	test_done
+fi
+
+test_expect_success 'enable reflogs' '
+	git config core.logallrefupdates true
+'
+
+test_expect_success 'prepare a trivial repository' '
+	echo Hello > A &&
+	git update-index --add A &&
+	git commit -m "Initial commit." &&
+	HEAD=$(git rev-parse --verify HEAD)
+'
+
+test_expect_success 'pack-refs --prune --all' '
+	test_path_is_missing .git/packed-refs &&
+	git pack-refs --no-prune --all &&
+	test_path_is_file .git/packed-refs &&
+	N=$(find .git/refs -type f | wc -l) &&
+	test "$N" != 0 &&
+
+	git pack-refs --prune --all &&
+	test_path_is_file .git/packed-refs &&
+	N=$(find .git/refs -type f) &&
+	test -z "$N"
+'
+
+SHA1=
+
+test_expect_success 'see if git show-ref works as expected' '
+	git branch a &&
+	SHA1=$(cat .git/refs/heads/a) &&
+	echo "$SHA1 refs/heads/a" >expect &&
+	git show-ref a >result &&
+	test_cmp expect result
+'
+
+test_expect_success 'see if a branch still exists when packed' '
+	git branch b &&
+	git pack-refs --all &&
+	rm -f .git/refs/heads/b &&
+	echo "$SHA1 refs/heads/b" >expect &&
+	git show-ref b >result &&
+	test_cmp expect result
+'
+
+test_expect_success 'git branch c/d should barf if branch c exists' '
+	git branch c &&
+	git pack-refs --all &&
+	rm -f .git/refs/heads/c &&
+	test_must_fail git branch c/d
+'
+
+test_expect_success 'see if a branch still exists after git pack-refs --prune' '
+	git branch e &&
+	git pack-refs --all --prune &&
+	echo "$SHA1 refs/heads/e" >expect &&
+	git show-ref e >result &&
+	test_cmp expect result
+'
+
+test_expect_success 'see if git pack-refs --prune remove ref files' '
+	git branch f &&
+	git pack-refs --all --prune &&
+	! test -f .git/refs/heads/f
+'
+
+test_expect_success 'see if git pack-refs --prune removes empty dirs' '
+	git branch r/s/t &&
+	git pack-refs --all --prune &&
+	! test -e .git/refs/heads/r
+'
+
+test_expect_success 'git branch g should work when git branch g/h has been deleted' '
+	git branch g/h &&
+	git pack-refs --all --prune &&
+	git branch -d g/h &&
+	git branch g &&
+	git pack-refs --all &&
+	git branch -d g
+'
+
+test_expect_success 'git branch i/j/k should barf if branch i exists' '
+	git branch i &&
+	git pack-refs --all --prune &&
+	test_must_fail git branch i/j/k
+'
+
+test_expect_success 'test git branch k after branch k/l/m and k/lm have been deleted' '
+	git branch k/l &&
+	git branch k/lm &&
+	git branch -d k/l &&
+	git branch k/l/m &&
+	git branch -d k/l/m &&
+	git branch -d k/lm &&
+	git branch k
+'
+
+test_expect_success 'test git branch n after some branch deletion and pruning' '
+	git branch n/o &&
+	git branch n/op &&
+	git branch -d n/o &&
+	git branch n/o/p &&
+	git branch -d n/op &&
+	git pack-refs --all --prune &&
+	git branch -d n/o/p &&
+	git branch n
+'
+
+test_expect_success 'test excluded refs are not packed' '
+	git branch dont_pack1 &&
+	git branch dont_pack2 &&
+	git branch pack_this &&
+	git pack-refs --all --exclude "refs/heads/dont_pack*" &&
+	test -f .git/refs/heads/dont_pack1 &&
+	test -f .git/refs/heads/dont_pack2 &&
+	! test -f .git/refs/heads/pack_this'
+
+test_expect_success 'test --no-exclude refs clears excluded refs' '
+	git branch dont_pack3 &&
+	git branch dont_pack4 &&
+	git pack-refs --all --exclude "refs/heads/dont_pack*" --no-exclude &&
+	! test -f .git/refs/heads/dont_pack3 &&
+	! test -f .git/refs/heads/dont_pack4'
+
+test_expect_success 'test only included refs are packed' '
+	git branch pack_this1 &&
+	git branch pack_this2 &&
+	git tag dont_pack5 &&
+	git pack-refs --include "refs/heads/pack_this*" &&
+	test -f .git/refs/tags/dont_pack5 &&
+	! test -f .git/refs/heads/pack_this1 &&
+	! test -f .git/refs/heads/pack_this2'
+
+test_expect_success 'test --no-include refs clears included refs' '
+	git branch pack1 &&
+	git branch pack2 &&
+	git pack-refs --include "refs/heads/pack*" --no-include &&
+	test -f .git/refs/heads/pack1 &&
+	test -f .git/refs/heads/pack2'
+
+test_expect_success 'test --exclude takes precedence over --include' '
+	git branch dont_pack5 &&
+	git pack-refs --include "refs/heads/pack*" --exclude "refs/heads/pack*" &&
+	test -f .git/refs/heads/dont_pack5'
+
+test_expect_success '--auto packs and prunes refs as usual' '
+	git branch auto &&
+	test_path_is_file .git/refs/heads/auto &&
+	git pack-refs --auto --all &&
+	test_path_is_missing .git/refs/heads/auto
+'
+
+test_expect_success 'see if up-to-date packed refs are preserved' '
+	git branch q &&
+	git pack-refs --all --prune &&
+	git update-ref refs/heads/q refs/heads/q &&
+	! test -f .git/refs/heads/q
+'
+
+test_expect_success 'pack, prune and repack' '
+	git tag foo &&
+	git pack-refs --all --prune &&
+	git show-ref >all-of-them &&
+	git pack-refs &&
+	git show-ref >again &&
+	test_cmp all-of-them again
+'
+
+test_expect_success 'explicit pack-refs with dangling packed reference' '
+	git commit --allow-empty -m "soon to be garbage-collected" &&
+	git pack-refs --all &&
+	git reset --hard HEAD^ &&
+	git reflog expire --expire=all --all &&
+	git prune --expire=all &&
+	git pack-refs --all 2>result &&
+	test_must_be_empty result
+'
+
+test_expect_success 'delete ref with dangling packed version' '
+	git checkout -b lamb &&
+	git commit --allow-empty -m "future garbage" &&
+	git pack-refs --all &&
+	git reset --hard HEAD^ &&
+	git checkout main &&
+	git reflog expire --expire=all --all &&
+	git prune --expire=all &&
+	git branch -d lamb 2>result &&
+	test_must_be_empty result
+'
+
+test_expect_success 'delete ref while another dangling packed ref' '
+	git branch lamb &&
+	git commit --allow-empty -m "future garbage" &&
+	git pack-refs --all &&
+	git reset --hard HEAD^ &&
+	git reflog expire --expire=all --all &&
+	git prune --expire=all &&
+	git branch -d lamb 2>result &&
+	test_must_be_empty result
+'
+
+test_expect_success 'pack ref directly below refs/' '
+	git update-ref refs/top HEAD &&
+	git pack-refs --all --prune &&
+	grep refs/top .git/packed-refs &&
+	test_path_is_missing .git/refs/top
+'
+
+test_expect_success 'do not pack ref in refs/bisect' '
+	git update-ref refs/bisect/local HEAD &&
+	git pack-refs --all --prune &&
+	! grep refs/bisect/local .git/packed-refs >/dev/null &&
+	test_path_is_file .git/refs/bisect/local
+'
+
+test_expect_success 'disable reflogs' '
+	git config core.logallrefupdates false &&
+	rm -rf .git/logs
+'
+
+test_expect_success 'create packed foo/bar/baz branch' '
+	git branch foo/bar/baz &&
+	git pack-refs --all --prune &&
+	test_path_is_missing .git/refs/heads/foo/bar/baz &&
+	test_must_fail git reflog exists refs/heads/foo/bar/baz
+'
+
+test_expect_success 'notice d/f conflict with existing directory' '
+	test_must_fail git branch foo &&
+	test_must_fail git branch foo/bar
+'
+
+test_expect_success 'existing directory reports concrete ref' '
+	test_must_fail git branch foo 2>stderr &&
+	test_grep refs/heads/foo/bar/baz stderr
+'
+
+test_expect_success 'notice d/f conflict with existing ref' '
+	test_must_fail git branch foo/bar/baz/extra &&
+	test_must_fail git branch foo/bar/baz/lots/of/extra/components
+'
+
+test_expect_success 'reject packed-refs with unterminated line' '
+	cp .git/packed-refs .git/packed-refs.bak &&
+	test_when_finished "mv .git/packed-refs.bak .git/packed-refs" &&
+	printf "%s" "$HEAD refs/zzzzz" >>.git/packed-refs &&
+	echo "fatal: unterminated line in .git/packed-refs: $HEAD refs/zzzzz" >expected_err &&
+	test_must_fail git for-each-ref >out 2>err &&
+	test_cmp expected_err err
+'
+
+test_expect_success 'reject packed-refs containing junk' '
+	cp .git/packed-refs .git/packed-refs.bak &&
+	test_when_finished "mv .git/packed-refs.bak .git/packed-refs" &&
+	printf "%s\n" "bogus content" >>.git/packed-refs &&
+	echo "fatal: unexpected line in .git/packed-refs: bogus content" >expected_err &&
+	test_must_fail git for-each-ref >out 2>err &&
+	test_cmp expected_err err
+'
+
+test_expect_success 'reject packed-refs with a short SHA-1' '
+	cp .git/packed-refs .git/packed-refs.bak &&
+	test_when_finished "mv .git/packed-refs.bak .git/packed-refs" &&
+	printf "%.7s %s\n" $HEAD refs/zzzzz >>.git/packed-refs &&
+	printf "fatal: unexpected line in .git/packed-refs: %.7s %s\n" $HEAD refs/zzzzz >expected_err &&
+	test_must_fail git for-each-ref >out 2>err &&
+	test_cmp expected_err err
+'
+
+test_expect_success 'timeout if packed-refs.lock exists' '
+	LOCK=.git/packed-refs.lock &&
+	>"$LOCK" &&
+	test_when_finished "rm -f $LOCK" &&
+	test_must_fail git pack-refs --all --prune
+'
+
+test_expect_success 'retry acquiring packed-refs.lock' '
+	LOCK=.git/packed-refs.lock &&
+	>"$LOCK" &&
+	test_when_finished "wait && rm -f $LOCK" &&
+	{
+		( sleep 1 && rm -f $LOCK ) &
+	} &&
+	git -c core.packedrefstimeout=3000 pack-refs --all --prune
+'
+
+test_expect_success SYMLINKS 'pack symlinked packed-refs' '
+	# First make sure that symlinking works when reading:
+	git update-ref refs/heads/lossy refs/heads/main &&
+	git for-each-ref >all-refs-before &&
+	mv .git/packed-refs .git/my-deviant-packed-refs &&
+	ln -s my-deviant-packed-refs .git/packed-refs &&
+	git for-each-ref >all-refs-linked &&
+	test_cmp all-refs-before all-refs-linked &&
+	git pack-refs --all --prune &&
+	git for-each-ref >all-refs-packed &&
+	test_cmp all-refs-before all-refs-packed &&
+	test -h .git/packed-refs &&
+	test "$(test_readlink .git/packed-refs)" = "my-deviant-packed-refs"
+'
+
+# The 'packed-refs' file is stored directly in .git/. This means it is global
+# to the repository, and can only contain refs that are shared across all
+# worktrees.
+test_expect_success 'refs/worktree must not be packed' '
+	test_commit initial &&
+	test_commit wt1 &&
+	test_commit wt2 &&
+	git worktree add wt1 wt1 &&
+	git worktree add wt2 wt2 &&
+	git checkout initial &&
+	git update-ref refs/worktree/foo HEAD &&
+	git -C wt1 update-ref refs/worktree/foo HEAD &&
+	git -C wt2 update-ref refs/worktree/foo HEAD &&
+	git pack-refs --all &&
+	test_path_is_missing .git/refs/tags/wt1 &&
+	test_path_is_file .git/refs/worktree/foo &&
+	test_path_is_file .git/worktrees/wt1/refs/worktree/foo &&
+	test_path_is_file .git/worktrees/wt2/refs/worktree/foo
+'
+
+# we do not want to count on running pack-refs to
+# actually pack it, as it is perfectly reasonable to
+# skip processing a broken ref
+test_expect_success 'create packed-refs file with broken ref' '
+	test_tick && git commit --allow-empty -m one &&
+	recoverable=$(git rev-parse HEAD) &&
+	test_tick && git commit --allow-empty -m two &&
+	missing=$(git rev-parse HEAD) &&
+	rm -f .git/refs/heads/main &&
+	cat >.git/packed-refs <<-EOF &&
+	$missing refs/heads/main
+	$recoverable refs/heads/other
+	EOF
+	echo $missing >expect &&
+	git rev-parse refs/heads/main >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'pack-refs does not silently delete broken packed ref' '
+	git pack-refs --all --prune &&
+	git rev-parse refs/heads/main >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'pack-refs does not drop broken refs during deletion' '
+	git update-ref -d refs/heads/other &&
+	git rev-parse refs/heads/main >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'maintenance --auto unconditionally packs loose refs' '
+	git update-ref refs/heads/something HEAD &&
+	test_path_is_file .git/refs/heads/something &&
+	git rev-parse refs/heads/something >expect &&
+	git maintenance run --task=pack-refs --auto &&
+	test_path_is_missing .git/refs/heads/something &&
+	git rev-parse refs/heads/something >actual &&
+	test_cmp expect actual
+'
+
+test_done
diff --git a/t/t0610-reftable-basics.sh b/t/t0610-reftable-basics.sh
new file mode 100755
index 0000000..178791e
--- /dev/null
+++ b/t/t0610-reftable-basics.sh
@@ -0,0 +1,1032 @@
+#!/bin/sh
+#
+# Copyright (c) 2020 Google LLC
+#
+
+test_description='reftable basics'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+. ./test-lib.sh
+
+if ! test_have_prereq REFTABLE
+then
+	skip_all='skipping reftable tests; set GIT_TEST_DEFAULT_REF_FORMAT=reftable'
+	test_done
+fi
+
+INVALID_OID=$(test_oid 001)
+
+test_expect_success 'init: creates basic reftable structures' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	test_path_is_dir repo/.git/reftable &&
+	test_path_is_file repo/.git/reftable/tables.list &&
+	echo reftable >expect &&
+	git -C repo rev-parse --show-ref-format >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'init: sha256 object format via environment variable' '
+	test_when_finished "rm -rf repo" &&
+	GIT_DEFAULT_HASH=sha256 git init repo &&
+	cat >expect <<-EOF &&
+	sha256
+	reftable
+	EOF
+	git -C repo rev-parse --show-object-format --show-ref-format >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'init: sha256 object format via option' '
+	test_when_finished "rm -rf repo" &&
+	git init --object-format=sha256 repo &&
+	cat >expect <<-EOF &&
+	sha256
+	reftable
+	EOF
+	git -C repo rev-parse --show-object-format --show-ref-format >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'init: reinitializing reftable backend succeeds' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	test_commit -C repo A &&
+
+	git -C repo for-each-ref >expect &&
+	git init --ref-format=reftable repo &&
+	git -C repo for-each-ref >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'init: reinitializing files with reftable backend fails' '
+	test_when_finished "rm -rf repo" &&
+	git init --ref-format=files repo &&
+	test_commit -C repo file &&
+
+	cp repo/.git/HEAD expect &&
+	test_must_fail git init --ref-format=reftable repo &&
+	test_cmp expect repo/.git/HEAD
+'
+
+test_expect_success 'init: reinitializing reftable with files backend fails' '
+	test_when_finished "rm -rf repo" &&
+	git init --ref-format=reftable repo &&
+	test_commit -C repo file &&
+
+	cp repo/.git/HEAD expect &&
+	test_must_fail git init --ref-format=files repo &&
+	test_cmp expect repo/.git/HEAD
+'
+
+test_expect_perms () {
+	local perms="$1"
+	local file="$2"
+	local actual="$(ls -l "$file")" &&
+
+	case "$actual" in
+	$perms*)
+		: happy
+		;;
+	*)
+		echo "$(basename $2) is not $perms but $actual"
+		false
+		;;
+	esac
+}
+
+test_expect_reftable_perms () {
+	local umask="$1"
+	local shared="$2"
+	local expect="$3"
+
+	test_expect_success POSIXPERM "init: honors --shared=$shared with umask $umask" '
+		test_when_finished "rm -rf repo" &&
+		(
+			umask $umask &&
+			git init --shared=$shared repo
+		) &&
+		test_expect_perms "$expect" repo/.git/reftable/tables.list &&
+		for table in repo/.git/reftable/*.ref
+		do
+			test_expect_perms "$expect" "$table" ||
+			return 1
+		done
+	'
+
+	test_expect_success POSIXPERM "pack-refs: honors --shared=$shared with umask $umask" '
+		test_when_finished "rm -rf repo" &&
+		(
+			umask $umask &&
+			git init --shared=$shared repo &&
+			test_commit -C repo A &&
+			test_line_count = 2 repo/.git/reftable/tables.list &&
+			git -C repo pack-refs
+		) &&
+		test_expect_perms "$expect" repo/.git/reftable/tables.list &&
+		for table in repo/.git/reftable/*.ref
+		do
+			test_expect_perms "$expect" "$table" ||
+			return 1
+		done
+	'
+}
+
+test_expect_reftable_perms 002 umask "-rw-rw-r--"
+test_expect_reftable_perms 022 umask "-rw-r--r--"
+test_expect_reftable_perms 027 umask "-rw-r-----"
+
+test_expect_reftable_perms 002 group "-rw-rw-r--"
+test_expect_reftable_perms 022 group "-rw-rw-r--"
+test_expect_reftable_perms 027 group "-rw-rw----"
+
+test_expect_reftable_perms 002 world "-rw-rw-r--"
+test_expect_reftable_perms 022 world "-rw-rw-r--"
+test_expect_reftable_perms 027 world "-rw-rw-r--"
+
+test_expect_success 'clone: can clone reftable repository' '
+	test_when_finished "rm -rf repo clone" &&
+	git init repo &&
+	test_commit -C repo message1 file1 &&
+
+	git clone repo cloned &&
+	echo reftable >expect &&
+	git -C cloned rev-parse --show-ref-format >actual &&
+	test_cmp expect actual &&
+	test_path_is_file cloned/file1
+'
+
+test_expect_success 'clone: can clone reffiles into reftable repository' '
+	test_when_finished "rm -rf reffiles reftable" &&
+	git init --ref-format=files reffiles &&
+	test_commit -C reffiles A &&
+	git clone --ref-format=reftable ./reffiles reftable &&
+
+	git -C reffiles rev-parse HEAD >expect &&
+	git -C reftable rev-parse HEAD >actual &&
+	test_cmp expect actual &&
+
+	git -C reftable rev-parse --show-ref-format >actual &&
+	echo reftable >expect &&
+	test_cmp expect actual &&
+
+	git -C reffiles rev-parse --show-ref-format >actual &&
+	echo files >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'clone: can clone reftable into reffiles repository' '
+	test_when_finished "rm -rf reffiles reftable" &&
+	git init --ref-format=reftable reftable &&
+	test_commit -C reftable A &&
+	git clone --ref-format=files ./reftable reffiles &&
+
+	git -C reftable rev-parse HEAD >expect &&
+	git -C reffiles rev-parse HEAD >actual &&
+	test_cmp expect actual &&
+
+	git -C reftable rev-parse --show-ref-format >actual &&
+	echo reftable >expect &&
+	test_cmp expect actual &&
+
+	git -C reffiles rev-parse --show-ref-format >actual &&
+	echo files >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'ref transaction: corrupted tables cause failure' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	(
+		cd repo &&
+		test_commit file1 &&
+		for f in .git/reftable/*.ref
+		do
+			: >"$f" || return 1
+		done &&
+		test_must_fail git update-ref refs/heads/main HEAD
+	)
+'
+
+test_expect_success 'ref transaction: corrupted tables.list cause failure' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	(
+		cd repo &&
+		test_commit file1 &&
+		echo garbage >.git/reftable/tables.list &&
+		test_must_fail git update-ref refs/heads/main HEAD
+	)
+'
+
+test_expect_success 'ref transaction: refuses to write ref causing F/D conflict' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	test_commit -C repo file &&
+	test_must_fail git -C repo update-ref refs/heads/main/forbidden
+'
+
+test_expect_success 'ref transaction: deleting ref with invalid name fails' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	test_commit -C repo file &&
+	test_must_fail git -C repo update-ref -d ../../my-private-file
+'
+
+test_expect_success 'ref transaction: can skip object ID verification' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	test_must_fail test-tool -C repo ref-store main update-ref msg refs/heads/branch $INVALID_OID $ZERO_OID 0 &&
+	test-tool -C repo ref-store main update-ref msg refs/heads/branch $INVALID_OID $ZERO_OID REF_SKIP_OID_VERIFICATION
+'
+
+test_expect_success 'ref transaction: updating same ref multiple times fails' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	test_commit -C repo A &&
+	cat >updates <<-EOF &&
+	update refs/heads/main $A
+	update refs/heads/main $A
+	EOF
+	cat >expect <<-EOF &&
+	fatal: multiple updates for ref ${SQ}refs/heads/main${SQ} not allowed
+	EOF
+	test_must_fail git -C repo update-ref --stdin <updates 2>err &&
+	test_cmp expect err
+'
+
+test_expect_success 'ref transaction: can delete symbolic self-reference with git-symbolic-ref(1)' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	git -C repo symbolic-ref refs/heads/self refs/heads/self &&
+	git -C repo symbolic-ref -d refs/heads/self
+'
+
+test_expect_success 'ref transaction: deleting symbolic self-reference without --no-deref fails' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	git -C repo symbolic-ref refs/heads/self refs/heads/self &&
+	cat >expect <<-EOF &&
+	error: multiple updates for ${SQ}refs/heads/self${SQ} (including one via symref ${SQ}refs/heads/self${SQ}) are not allowed
+	EOF
+	test_must_fail git -C repo update-ref -d refs/heads/self 2>err &&
+	test_cmp expect err
+'
+
+test_expect_success 'ref transaction: deleting symbolic self-reference with --no-deref succeeds' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	git -C repo symbolic-ref refs/heads/self refs/heads/self &&
+	git -C repo update-ref -d --no-deref refs/heads/self
+'
+
+test_expect_success 'ref transaction: creating symbolic ref fails with F/D conflict' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	test_commit -C repo A &&
+	cat >expect <<-EOF &&
+	error: unable to write symref for refs/heads: file/directory conflict
+	EOF
+	test_must_fail git -C repo symbolic-ref refs/heads refs/heads/foo 2>err &&
+	test_cmp expect err
+'
+
+test_expect_success 'ref transaction: ref deletion' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	(
+		cd repo &&
+		test_commit file &&
+		HEAD_OID=$(git show-ref -s --verify HEAD) &&
+		cat >expect <<-EOF &&
+		$HEAD_OID refs/heads/main
+		$HEAD_OID refs/tags/file
+		EOF
+		git show-ref >actual &&
+		test_cmp expect actual &&
+
+		test_must_fail git update-ref -d refs/tags/file $INVALID_OID &&
+		git show-ref >actual &&
+		test_cmp expect actual &&
+
+		git update-ref -d refs/tags/file $HEAD_OID &&
+		echo "$HEAD_OID refs/heads/main" >expect &&
+		git show-ref >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'ref transaction: writes cause auto-compaction' '
+	test_when_finished "rm -rf repo" &&
+
+	git init repo &&
+	test_line_count = 1 repo/.git/reftable/tables.list &&
+
+	test_commit -C repo --no-tag A &&
+	test_line_count = 1 repo/.git/reftable/tables.list &&
+
+	test_commit -C repo --no-tag B &&
+	test_line_count = 1 repo/.git/reftable/tables.list
+'
+
+test_expect_success 'ref transaction: env var disables compaction' '
+	test_when_finished "rm -rf repo" &&
+
+	git init repo &&
+	test_commit -C repo A &&
+
+	start=$(wc -l <repo/.git/reftable/tables.list) &&
+	iterations=5 &&
+	expected=$((start + iterations)) &&
+
+	for i in $(test_seq $iterations)
+	do
+		GIT_TEST_REFTABLE_AUTOCOMPACTION=false \
+		git -C repo update-ref branch-$i HEAD || return 1
+	done &&
+	test_line_count = $expected repo/.git/reftable/tables.list &&
+
+	git -C repo update-ref foo HEAD &&
+	test_line_count -lt $expected repo/.git/reftable/tables.list
+'
+
+test_expect_success 'ref transaction: alternating table sizes are compacted' '
+	test_when_finished "rm -rf repo" &&
+
+	git init repo &&
+	test_commit -C repo A &&
+	for i in $(test_seq 5)
+	do
+		git -C repo branch -f foo &&
+		git -C repo branch -d foo || return 1
+	done &&
+	test_line_count = 2 repo/.git/reftable/tables.list
+'
+
+check_fsync_events () {
+	local trace="$1" &&
+	shift &&
+
+	cat >expect &&
+	sed -n \
+		-e '/^{"event":"counter",.*"category":"fsync",/ {
+			s/.*"category":"fsync",//;
+			s/}$//;
+			p;
+		}' \
+		<"$trace" >actual &&
+	test_cmp expect actual
+}
+
+test_expect_success 'ref transaction: writes are synced' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	test_commit -C repo initial &&
+
+	GIT_TRACE2_EVENT="$(pwd)/trace2.txt" \
+	GIT_TEST_FSYNC=true \
+		git -C repo -c core.fsync=reference \
+		-c core.fsyncMethod=fsync update-ref refs/heads/branch HEAD &&
+	check_fsync_events trace2.txt <<-EOF
+	"name":"hardware-flush","count":4
+	EOF
+'
+
+test_expect_success 'ref transaction: empty transaction in empty repo' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	test_commit -C repo --no-tag A &&
+	git -C repo update-ref -d refs/heads/main &&
+	test-tool -C repo ref-store main delete-refs REF_NO_DEREF msg HEAD &&
+	git -C repo update-ref --stdin <<-EOF
+	prepare
+	commit
+	EOF
+'
+
+test_expect_success 'ref transaction: fails gracefully when auto compaction fails' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	(
+		cd repo &&
+
+		test_commit A &&
+		for i in $(test_seq 10)
+		do
+			git branch branch-$i &&
+			for table in .git/reftable/*.ref
+			do
+				touch "$table.lock" || exit 1
+			done ||
+			exit 1
+		done &&
+		test_line_count = 10 .git/reftable/tables.list
+	)
+'
+
+test_expect_success 'pack-refs: compacts tables' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+
+	test_commit -C repo A &&
+	ls -1 repo/.git/reftable >table-files &&
+	test_line_count = 3 table-files &&
+	test_line_count = 2 repo/.git/reftable/tables.list &&
+
+	git -C repo pack-refs &&
+	ls -1 repo/.git/reftable >table-files &&
+	test_line_count = 2 table-files &&
+	test_line_count = 1 repo/.git/reftable/tables.list
+'
+
+test_expect_success 'pack-refs: compaction raises locking errors' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	test_commit -C repo A &&
+	touch repo/.git/reftable/tables.list.lock &&
+	cat >expect <<-EOF &&
+	error: unable to compact stack: data is locked
+	EOF
+	test_must_fail git -C repo pack-refs 2>err &&
+	test_cmp expect err
+'
+
+for command in pack-refs gc "maintenance run --task=pack-refs"
+do
+test_expect_success "$command: auto compaction" '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	(
+		cd repo &&
+
+		test_commit A &&
+
+		# We need a bit of setup to ensure that git-gc(1) actually
+		# triggers, and that it does not write anything to the refdb.
+		git config gc.auto 1 &&
+		git config gc.autoDetach 0 &&
+		git config gc.reflogExpire never &&
+		git config gc.reflogExpireUnreachable never &&
+		test_oid blob17_1 | git hash-object -w --stdin &&
+
+		# The tables should have been auto-compacted, and thus auto
+		# compaction should not have to do anything.
+		ls -1 .git/reftable >tables-expect &&
+		test_line_count = 3 tables-expect &&
+		git $command --auto &&
+		ls -1 .git/reftable >tables-actual &&
+		test_cmp tables-expect tables-actual &&
+
+		test_oid blob17_2 | git hash-object -w --stdin &&
+
+		# Lock all tables write some refs. Auto-compaction will be
+		# unable to compact tables and thus fails gracefully, leaving
+		# the stack in a sub-optimal state.
+		ls .git/reftable/*.ref |
+		while read table
+		do
+			touch "$table.lock" || exit 1
+		done &&
+		git branch B &&
+		git branch C &&
+		rm .git/reftable/*.lock &&
+		test_line_count = 4 .git/reftable/tables.list &&
+
+		git $command --auto &&
+		test_line_count = 1 .git/reftable/tables.list
+	)
+'
+done
+
+test_expect_success 'pack-refs: prunes stale tables' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	touch repo/.git/reftable/stale-table.ref &&
+	git -C repo pack-refs &&
+	test_path_is_missing repo/.git/reftable/stable-ref.ref
+'
+
+test_expect_success 'pack-refs: does not prune non-table files' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	touch repo/.git/reftable/garbage &&
+	git -C repo pack-refs &&
+	test_path_is_file repo/.git/reftable/garbage
+'
+
+test_expect_success 'packed-refs: writes are synced' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	test_commit -C repo initial &&
+	test_line_count = 2 table-files &&
+
+	: >trace2.txt &&
+	GIT_TRACE2_EVENT="$(pwd)/trace2.txt" \
+	GIT_TEST_FSYNC=true \
+		git -C repo -c core.fsync=reference \
+		-c core.fsyncMethod=fsync pack-refs &&
+	check_fsync_events trace2.txt <<-EOF
+	"name":"hardware-flush","count":2
+	EOF
+'
+
+test_expect_success 'ref iterator: bogus names are flagged' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	(
+		cd repo &&
+		test_commit --no-tag file &&
+		test-tool ref-store main update-ref msg "refs/heads/bogus..name" $(git rev-parse HEAD) $ZERO_OID REF_SKIP_REFNAME_VERIFICATION &&
+
+		cat >expect <<-EOF &&
+		$ZERO_OID refs/heads/bogus..name 0xc
+		$(git rev-parse HEAD) refs/heads/main 0x0
+		EOF
+		test-tool ref-store main for-each-ref "" >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'ref iterator: missing object IDs are not flagged' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	(
+		cd repo &&
+		test-tool ref-store main update-ref msg "refs/heads/broken-hash" $INVALID_OID $ZERO_OID REF_SKIP_OID_VERIFICATION &&
+
+		cat >expect <<-EOF &&
+		$INVALID_OID refs/heads/broken-hash 0x0
+		EOF
+		test-tool ref-store main for-each-ref "" >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'basic: commit and list refs' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	test_commit -C repo file &&
+	test_write_lines refs/heads/main refs/tags/file >expect &&
+	git -C repo for-each-ref --format="%(refname)" >actual &&
+	test_cmp actual expect
+'
+
+test_expect_success 'basic: can write large commit message' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	perl -e "
+		print \"this is a long commit message\" x 50000
+	" >commit-msg &&
+	git -C repo commit --allow-empty --file=../commit-msg
+'
+
+test_expect_success 'basic: show-ref fails with empty repository' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	test_must_fail git -C repo show-ref >actual &&
+	test_must_be_empty actual
+'
+
+test_expect_success 'basic: can check out unborn branch' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	git -C repo checkout -b main
+'
+
+test_expect_success 'basic: peeled tags are stored' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	test_commit -C repo file &&
+	git -C repo tag -m "annotated tag" test_tag HEAD &&
+	for ref in refs/heads/main refs/tags/file refs/tags/test_tag refs/tags/test_tag^{}
+	do
+		echo "$(git -C repo rev-parse "$ref") $ref" || return 1
+	done >expect &&
+	git -C repo show-ref -d >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'basic: for-each-ref can print symrefs' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	(
+		cd repo &&
+		test_commit file &&
+		git branch &&
+		git symbolic-ref refs/heads/sym refs/heads/main &&
+		cat >expected <<-EOF &&
+		refs/heads/main
+		EOF
+		git for-each-ref --format="%(symref)" refs/heads/sym >actual &&
+		test_cmp expected actual
+	)
+'
+
+test_expect_success 'basic: notes' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	(
+		write_script fake_editor <<-\EOF &&
+		echo "$MSG" >"$1"
+		echo "$MSG" >&2
+		EOF
+
+		test_commit 1st &&
+		test_commit 2nd &&
+		GIT_EDITOR=./fake_editor MSG=b4 git notes add &&
+		GIT_EDITOR=./fake_editor MSG=b3 git notes edit &&
+		echo b4 >expect &&
+		git notes --ref commits@{1} show >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'basic: stash' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	(
+		cd repo &&
+		test_commit file &&
+		git stash list >expect &&
+		test_line_count = 0 expect &&
+
+		echo hoi >>file.t &&
+		git stash push -m stashed &&
+		git stash list >expect &&
+		test_line_count = 1 expect &&
+
+		git stash clear &&
+		git stash list >expect &&
+		test_line_count = 0 expect
+	)
+'
+
+test_expect_success 'basic: cherry-pick' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	(
+		cd repo &&
+		test_commit message1 file1 &&
+		test_commit message2 file2 &&
+		git branch source &&
+		git checkout HEAD^ &&
+		test_commit message3 file3 &&
+		git cherry-pick source &&
+		test_path_is_file file2
+	)
+'
+
+test_expect_success 'basic: rebase' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	(
+		cd repo &&
+		test_commit message1 file1 &&
+		test_commit message2 file2 &&
+		git branch source &&
+		git checkout HEAD^ &&
+		test_commit message3 file3 &&
+		git rebase source &&
+		test_path_is_file file2
+	)
+'
+
+test_expect_success 'reflog: can delete separate reflog entries' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	(
+		cd repo &&
+
+		test_commit file &&
+		test_commit file2 &&
+		test_commit file3 &&
+		test_commit file4 &&
+		git reflog >actual &&
+		grep file3 actual &&
+
+		git reflog delete HEAD@{1} &&
+		git reflog >actual &&
+		! grep file3 actual
+	)
+'
+
+test_expect_success 'reflog: can switch to previous branch' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	(
+		cd repo &&
+		test_commit file1 &&
+		git checkout -b branch1 &&
+		test_commit file2 &&
+		git checkout -b branch2 &&
+		git switch - &&
+		git rev-parse --symbolic-full-name HEAD >actual &&
+		echo refs/heads/branch1 >expect &&
+		test_cmp actual expect
+	)
+'
+
+test_expect_success 'reflog: copying branch writes reflog entry' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	(
+		cd repo &&
+		test_commit file1 &&
+		test_commit file2 &&
+		oid=$(git rev-parse --short HEAD) &&
+		git branch src &&
+		cat >expect <<-EOF &&
+		${oid} dst@{0}: Branch: copied refs/heads/src to refs/heads/dst
+		${oid} dst@{1}: branch: Created from main
+		EOF
+		git branch -c src dst &&
+		git reflog dst >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'reflog: renaming branch writes reflog entry' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	(
+		cd repo &&
+		git symbolic-ref HEAD refs/heads/before &&
+		test_commit file &&
+		git show-ref >expected.refs &&
+		sed s/before/after/g <expected.refs >expected &&
+		git branch -M after &&
+		git show-ref >actual &&
+		test_cmp expected actual &&
+		echo refs/heads/after >expected &&
+		git symbolic-ref HEAD >actual &&
+		test_cmp expected actual
+	)
+'
+
+test_expect_success 'reflog: can store empty logs' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	(
+		cd repo &&
+
+		test_must_fail test-tool ref-store main reflog-exists refs/heads/branch &&
+		test-tool ref-store main create-reflog refs/heads/branch &&
+		test-tool ref-store main reflog-exists refs/heads/branch &&
+		test-tool ref-store main for-each-reflog-ent-reverse refs/heads/branch >actual &&
+		test_must_be_empty actual
+	)
+'
+
+test_expect_success 'reflog: expiry empties reflog' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	(
+		cd repo &&
+
+		test_commit initial &&
+		git checkout -b branch &&
+		test_commit fileA &&
+		test_commit fileB &&
+
+		cat >expect <<-EOF &&
+		commit: fileB
+		commit: fileA
+		branch: Created from HEAD
+		EOF
+		git reflog show --format="%gs" refs/heads/branch >actual &&
+		test_cmp expect actual &&
+
+		git reflog expire branch --expire=all &&
+		git reflog show --format="%gs" refs/heads/branch >actual &&
+		test_must_be_empty actual &&
+		test-tool ref-store main reflog-exists refs/heads/branch
+	)
+'
+
+test_expect_success 'reflog: can be deleted' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	(
+		cd repo &&
+		test_commit initial &&
+		test-tool ref-store main reflog-exists refs/heads/main &&
+		test-tool ref-store main delete-reflog refs/heads/main &&
+		test_must_fail test-tool ref-store main reflog-exists refs/heads/main
+	)
+'
+
+test_expect_success 'reflog: garbage collection deletes reflog entries' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	(
+		cd repo &&
+
+		for count in $(test_seq 1 10)
+		do
+			test_commit "number $count" file.t $count number-$count ||
+			return 1
+		done &&
+		git reflog refs/heads/main >actual &&
+		test_line_count = 10 actual &&
+		grep "commit (initial): number 1" actual &&
+		grep "commit: number 10" actual &&
+
+		git gc &&
+		git reflog refs/heads/main >actual &&
+		test_line_count = 0 actual
+	)
+'
+
+test_expect_success 'reflog: updates via HEAD update HEAD reflog' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	(
+		cd repo &&
+		test_commit main-one &&
+		git checkout -b new-branch &&
+		test_commit new-one &&
+		test_commit new-two &&
+
+		echo new-one >expect &&
+		git log -1 --format=%s HEAD@{1} >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'worktree: adding worktree creates separate stack' '
+	test_when_finished "rm -rf repo worktree" &&
+	git init repo &&
+	test_commit -C repo A &&
+
+	git -C repo worktree add ../worktree &&
+	test_path_is_file repo/.git/worktrees/worktree/refs/heads &&
+	echo "ref: refs/heads/.invalid" >expect &&
+	test_cmp expect repo/.git/worktrees/worktree/HEAD &&
+	test_path_is_dir repo/.git/worktrees/worktree/reftable &&
+	test_path_is_file repo/.git/worktrees/worktree/reftable/tables.list
+'
+
+test_expect_success 'worktree: pack-refs in main repo packs main refs' '
+	test_when_finished "rm -rf repo worktree" &&
+	git init repo &&
+	test_commit -C repo A &&
+
+	GIT_TEST_REFTABLE_AUTOCOMPACTION=false \
+	git -C repo worktree add ../worktree &&
+	GIT_TEST_REFTABLE_AUTOCOMPACTION=false \
+	git -C worktree update-ref refs/worktree/per-worktree HEAD &&
+
+	test_line_count = 4 repo/.git/worktrees/worktree/reftable/tables.list &&
+	test_line_count = 3 repo/.git/reftable/tables.list &&
+	git -C repo pack-refs &&
+	test_line_count = 4 repo/.git/worktrees/worktree/reftable/tables.list &&
+	test_line_count = 1 repo/.git/reftable/tables.list
+'
+
+test_expect_success 'worktree: pack-refs in worktree packs worktree refs' '
+	test_when_finished "rm -rf repo worktree" &&
+	git init repo &&
+	test_commit -C repo A &&
+
+	GIT_TEST_REFTABLE_AUTOCOMPACTION=false \
+	git -C repo worktree add ../worktree &&
+	GIT_TEST_REFTABLE_AUTOCOMPACTION=false \
+	git -C worktree update-ref refs/worktree/per-worktree HEAD &&
+
+	test_line_count = 4 repo/.git/worktrees/worktree/reftable/tables.list &&
+	test_line_count = 3 repo/.git/reftable/tables.list &&
+	git -C worktree pack-refs &&
+	test_line_count = 1 repo/.git/worktrees/worktree/reftable/tables.list &&
+	test_line_count = 3 repo/.git/reftable/tables.list
+'
+
+test_expect_success 'worktree: creating shared ref updates main stack' '
+	test_when_finished "rm -rf repo worktree" &&
+	git init repo &&
+	test_commit -C repo A &&
+
+	git -C repo worktree add ../worktree &&
+	git -C repo pack-refs &&
+	git -C worktree pack-refs &&
+	test_line_count = 1 repo/.git/worktrees/worktree/reftable/tables.list &&
+	test_line_count = 1 repo/.git/reftable/tables.list &&
+
+	GIT_TEST_REFTABLE_AUTOCOMPACTION=false \
+	git -C worktree update-ref refs/heads/shared HEAD &&
+	test_line_count = 1 repo/.git/worktrees/worktree/reftable/tables.list &&
+	test_line_count = 2 repo/.git/reftable/tables.list
+'
+
+test_expect_success 'worktree: creating per-worktree ref updates worktree stack' '
+	test_when_finished "rm -rf repo worktree" &&
+	git init repo &&
+	test_commit -C repo A &&
+
+	git -C repo worktree add ../worktree &&
+	git -C repo pack-refs &&
+	git -C worktree pack-refs &&
+	test_line_count = 1 repo/.git/worktrees/worktree/reftable/tables.list &&
+	test_line_count = 1 repo/.git/reftable/tables.list &&
+
+	git -C worktree update-ref refs/bisect/per-worktree HEAD &&
+	test_line_count = 2 repo/.git/worktrees/worktree/reftable/tables.list &&
+	test_line_count = 1 repo/.git/reftable/tables.list
+'
+
+test_expect_success 'worktree: creating per-worktree ref from main repo' '
+	test_when_finished "rm -rf repo worktree" &&
+	git init repo &&
+	test_commit -C repo A &&
+
+	git -C repo worktree add ../worktree &&
+	git -C repo pack-refs &&
+	git -C worktree pack-refs &&
+	test_line_count = 1 repo/.git/worktrees/worktree/reftable/tables.list &&
+	test_line_count = 1 repo/.git/reftable/tables.list &&
+
+	git -C repo update-ref worktrees/worktree/refs/bisect/per-worktree HEAD &&
+	test_line_count = 2 repo/.git/worktrees/worktree/reftable/tables.list &&
+	test_line_count = 1 repo/.git/reftable/tables.list
+'
+
+test_expect_success 'worktree: creating per-worktree ref from second worktree' '
+	test_when_finished "rm -rf repo wt1 wt2" &&
+	git init repo &&
+	test_commit -C repo A &&
+
+	git -C repo worktree add ../wt1 &&
+	git -C repo worktree add ../wt2 &&
+	git -C repo pack-refs &&
+	git -C wt1 pack-refs &&
+	git -C wt2 pack-refs &&
+	test_line_count = 1 repo/.git/worktrees/wt1/reftable/tables.list &&
+	test_line_count = 1 repo/.git/worktrees/wt2/reftable/tables.list &&
+	test_line_count = 1 repo/.git/reftable/tables.list &&
+
+	git -C wt1 update-ref worktrees/wt2/refs/bisect/per-worktree HEAD &&
+	test_line_count = 1 repo/.git/worktrees/wt1/reftable/tables.list &&
+	test_line_count = 2 repo/.git/worktrees/wt2/reftable/tables.list &&
+	test_line_count = 1 repo/.git/reftable/tables.list
+'
+
+test_expect_success 'worktree: can create shared and per-worktree ref in one transaction' '
+	test_when_finished "rm -rf repo worktree" &&
+	git init repo &&
+	test_commit -C repo A &&
+
+	git -C repo worktree add ../worktree &&
+	git -C repo pack-refs &&
+	git -C worktree pack-refs &&
+	test_line_count = 1 repo/.git/worktrees/worktree/reftable/tables.list &&
+	test_line_count = 1 repo/.git/reftable/tables.list &&
+
+	cat >stdin <<-EOF &&
+	create worktrees/worktree/refs/bisect/per-worktree HEAD
+	create refs/branches/shared HEAD
+	EOF
+	git -C repo update-ref --stdin <stdin &&
+	test_line_count = 2 repo/.git/worktrees/worktree/reftable/tables.list &&
+	test_line_count = 2 repo/.git/reftable/tables.list
+'
+
+test_expect_success 'worktree: can access common refs' '
+	test_when_finished "rm -rf repo worktree" &&
+	git init repo &&
+	test_commit -C repo file1 &&
+	git -C repo branch branch1 &&
+	git -C repo worktree add ../worktree &&
+
+	echo refs/heads/worktree >expect &&
+	git -C worktree symbolic-ref HEAD >actual &&
+	test_cmp expect actual &&
+	git -C worktree checkout branch1
+'
+
+test_expect_success 'worktree: adds worktree with detached HEAD' '
+	test_when_finished "rm -rf repo worktree" &&
+
+	git init repo &&
+	test_commit -C repo A &&
+	git -C repo rev-parse main >expect &&
+
+	git -C repo worktree add --detach ../worktree main &&
+	git -C worktree rev-parse HEAD >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'fetch: accessing FETCH_HEAD special ref works' '
+	test_when_finished "rm -rf repo sub" &&
+
+	git init sub &&
+	test_commit -C sub two &&
+	git -C sub rev-parse HEAD >expect &&
+
+	git init repo &&
+	test_commit -C repo one &&
+	git -C repo fetch ../sub &&
+	git -C repo rev-parse FETCH_HEAD >actual &&
+	test_cmp expect actual
+'
+
+test_done
diff --git a/t/t0611-reftable-httpd.sh b/t/t0611-reftable-httpd.sh
new file mode 100755
index 0000000..5e05b9c
--- /dev/null
+++ b/t/t0611-reftable-httpd.sh
@@ -0,0 +1,26 @@
+#!/bin/sh
+
+test_description='reftable HTTPD tests'
+
+. ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-httpd.sh
+
+start_httpd
+
+REPO="$HTTPD_DOCUMENT_ROOT_PATH/repo"
+
+test_expect_success 'serving ls-remote' '
+	git init --ref-format=reftable -b main "$REPO" &&
+	cd "$REPO" &&
+	test_commit m1 &&
+	>.git/git-daemon-export-ok &&
+	git ls-remote "http://127.0.0.1:$LIB_HTTPD_PORT/smart/repo" | cut -f 2-2 -d "	" >actual &&
+	cat >expect <<-EOF &&
+	HEAD
+	refs/heads/main
+	refs/tags/m1
+	EOF
+	test_cmp actual expect
+'
+
+test_done
diff --git a/t/t1000-read-tree-m-3way.sh b/t/t1000-read-tree-m-3way.sh
index 013c5a7..0e8c0df 100755
--- a/t/t1000-read-tree-m-3way.sh
+++ b/t/t1000-read-tree-m-3way.sh
@@ -71,6 +71,8 @@ In addition:
  DF: a special case, where A makes a directory and B makes a file.
 
 '
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-read-tree.sh
 . "$TEST_DIRECTORY"/lib-read-tree-m-3way.sh
diff --git a/t/t1001-read-tree-m-2way.sh b/t/t1001-read-tree-m-2way.sh
index 1057a96..88c524f 100755
--- a/t/t1001-read-tree-m-2way.sh
+++ b/t/t1001-read-tree-m-2way.sh
@@ -20,11 +20,13 @@ In the test, these paths are used:
 	rezrov  - in H, deleted in M
 	yomin   - not in H or M
 '
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-read-tree.sh
 
 read_tree_twoway () {
-    git read-tree -m "$1" "$2" && git ls-files --stage
+	git read-tree -m "$1" "$2" && git ls-files --stage
 }
 
 compare_change () {
@@ -36,11 +38,12 @@ compare_change () {
 }
 
 check_cache_at () {
-	clean_if_empty=$(git diff-files -- "$1")
+	git diff-files -- "$1" >out &&
+	clean_if_empty=$(cat out) &&
 	case "$clean_if_empty" in
 	'')  echo "$1: clean" ;;
 	?*)  echo "$1: dirty" ;;
-	esac
+	esac &&
 	case "$2,$clean_if_empty" in
 	clean,)		:     ;;
 	clean,?*)	false ;;
@@ -367,7 +370,7 @@ test_expect_success 'read-tree supports the super-prefix' '
 	cat <<-EOF >expect &&
 		error: Updating '\''fictional/a'\'' would lose untracked files in it
 	EOF
-	test_must_fail git --super-prefix fictional/ read-tree -u -m "$treeH" "$treeM" 2>actual &&
+	test_must_fail git read-tree --super-prefix fictional/ -u -m "$treeH" "$treeM" 2>actual &&
 	test_cmp expect actual
 '
 
diff --git a/t/t1002-read-tree-m-u-2way.sh b/t/t1002-read-tree-m-u-2way.sh
index 9c05f5e..a7c2ed0 100755
--- a/t/t1002-read-tree-m-u-2way.sh
+++ b/t/t1002-read-tree-m-u-2way.sh
@@ -8,6 +8,8 @@ test_description='Two way merge with read-tree -m -u $H $M
 This is identical to t1001, but uses -u to update the work tree as well.
 
 '
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-read-tree.sh
 
@@ -21,11 +23,12 @@ compare_change () {
 }
 
 check_cache_at () {
-	clean_if_empty=$(git diff-files -- "$1")
+	git diff-files -- "$1" >out &&
+	clean_if_empty=$(cat out) &&
 	case "$clean_if_empty" in
 	'')  echo "$1: clean" ;;
 	?*)  echo "$1: dirty" ;;
-	esac
+	esac &&
 	case "$2,$clean_if_empty" in
 	clean,)		:     ;;
 	clean,?*)	false ;;
@@ -34,315 +37,312 @@ check_cache_at () {
 	esac
 }
 
-test_expect_success \
-    setup \
-    'echo frotz >frotz &&
-     echo nitfol >nitfol &&
-     echo bozbar >bozbar &&
-     echo rezrov >rezrov &&
-     git update-index --add nitfol bozbar rezrov &&
-     treeH=$(git write-tree) &&
-     echo treeH $treeH &&
-     git ls-tree $treeH &&
-
-     echo gnusto >bozbar &&
-     git update-index --add frotz bozbar --force-remove rezrov &&
-     git ls-files --stage >M.out &&
-     treeM=$(git write-tree) &&
-     echo treeM $treeM &&
-     git ls-tree $treeM &&
-     cp bozbar bozbar.M &&
-     cp frotz frotz.M &&
-     cp nitfol nitfol.M &&
-     git diff-tree $treeH $treeM'
-
-test_expect_success \
-    '1, 2, 3 - no carry forward' \
-    'rm -f .git/index nitfol bozbar rezrov frotz &&
-     read_tree_u_must_succeed --reset -u $treeH &&
-     read_tree_u_must_succeed -m -u $treeH $treeM &&
-     git ls-files --stage >1-3.out &&
-     cmp M.out 1-3.out &&
-     test_cmp bozbar.M bozbar &&
-     test_cmp frotz.M frotz &&
-     test_cmp nitfol.M nitfol &&
-     check_cache_at bozbar clean &&
-     check_cache_at frotz clean &&
-     check_cache_at nitfol clean'
-
-test_expect_success \
-    '4 - carry forward local addition.' \
-    'rm -f .git/index nitfol bozbar rezrov frotz &&
-     read_tree_u_must_succeed --reset -u $treeH &&
-     echo "+100644 X 0	yomin" >expected &&
-     echo yomin >yomin &&
-     git update-index --add yomin &&
-     read_tree_u_must_succeed -m -u $treeH $treeM &&
-     git ls-files --stage >4.out &&
-     test_might_fail git diff -U0 --no-index M.out 4.out >4diff.out &&
-     compare_change 4diff.out expected &&
-     check_cache_at yomin clean &&
-     test_cmp bozbar.M bozbar &&
-     test_cmp frotz.M frotz &&
-     test_cmp nitfol.M nitfol &&
-     echo yomin >yomin1 &&
-     diff yomin yomin1 &&
-     rm -f yomin1'
-
-test_expect_success \
-    '5 - carry forward local addition.' \
-    'rm -f .git/index nitfol bozbar rezrov frotz &&
-     read_tree_u_must_succeed --reset -u $treeH &&
-     read_tree_u_must_succeed -m -u $treeH &&
-     echo yomin >yomin &&
-     git update-index --add yomin &&
-     echo yomin yomin >yomin &&
-     read_tree_u_must_succeed -m -u $treeH $treeM &&
-     git ls-files --stage >5.out &&
-     test_might_fail git diff -U0 --no-index M.out 5.out >5diff.out &&
-     compare_change 5diff.out expected &&
-     check_cache_at yomin dirty &&
-     test_cmp bozbar.M bozbar &&
-     test_cmp frotz.M frotz &&
-     test_cmp nitfol.M nitfol &&
-     : dirty index should have prevented -u from checking it out. &&
-     echo yomin yomin >yomin1 &&
-     diff yomin yomin1 &&
-     rm -f yomin1'
-
-test_expect_success \
-    '6 - local addition already has the same.' \
-    'rm -f .git/index nitfol bozbar rezrov frotz &&
-     read_tree_u_must_succeed --reset -u $treeH &&
-     echo frotz >frotz &&
-     git update-index --add frotz &&
-     read_tree_u_must_succeed -m -u $treeH $treeM &&
-     git ls-files --stage >6.out &&
-     test_cmp M.out 6.out &&
-     check_cache_at frotz clean &&
-     test_cmp bozbar.M bozbar &&
-     test_cmp frotz.M frotz &&
-     test_cmp nitfol.M nitfol &&
-     echo frotz >frotz1 &&
-     diff frotz frotz1 &&
-     rm -f frotz1'
-
-test_expect_success \
-    '7 - local addition already has the same.' \
-    'rm -f .git/index nitfol bozbar rezrov frotz &&
-     read_tree_u_must_succeed --reset -u $treeH &&
-     echo frotz >frotz &&
-     git update-index --add frotz &&
-     echo frotz frotz >frotz &&
-     read_tree_u_must_succeed -m -u $treeH $treeM &&
-     git ls-files --stage >7.out &&
-     test_cmp M.out 7.out &&
-     check_cache_at frotz dirty &&
-     test_cmp bozbar.M bozbar &&
-     test_cmp nitfol.M nitfol &&
-     : dirty index should have prevented -u from checking it out. &&
-     echo frotz frotz >frotz1 &&
-     diff frotz frotz1 &&
-     rm -f frotz1'
-
-test_expect_success \
-    '8 - conflicting addition.' \
-    'rm -f .git/index nitfol bozbar rezrov frotz &&
-     read_tree_u_must_succeed --reset -u $treeH &&
-     echo frotz frotz >frotz &&
-     git update-index --add frotz &&
-     if read_tree_u_must_succeed -m -u $treeH $treeM; then false; else :; fi'
-
-test_expect_success \
-    '9 - conflicting addition.' \
-    'rm -f .git/index nitfol bozbar rezrov frotz &&
-     read_tree_u_must_succeed --reset -u $treeH &&
-     echo frotz frotz >frotz &&
-     git update-index --add frotz &&
-     echo frotz >frotz &&
-     if read_tree_u_must_succeed -m -u $treeH $treeM; then false; else :; fi'
-
-test_expect_success \
-    '10 - path removed.' \
-    'rm -f .git/index nitfol bozbar rezrov frotz &&
-     read_tree_u_must_succeed --reset -u $treeH &&
-     echo rezrov >rezrov &&
-     git update-index --add rezrov &&
-     read_tree_u_must_succeed -m -u $treeH $treeM &&
-     git ls-files --stage >10.out &&
-     cmp M.out 10.out &&
-     test_cmp bozbar.M bozbar &&
-     test_cmp frotz.M frotz &&
-     test_cmp nitfol.M nitfol
+test_expect_success setup '
+	echo frotz >frotz &&
+	echo nitfol >nitfol &&
+	echo bozbar >bozbar &&
+	echo rezrov >rezrov &&
+	git update-index --add nitfol bozbar rezrov &&
+	treeH=$(git write-tree) &&
+	echo treeH $treeH &&
+	git ls-tree $treeH &&
+
+	echo gnusto >bozbar &&
+	git update-index --add frotz bozbar --force-remove rezrov &&
+	git ls-files --stage >M.out &&
+	treeM=$(git write-tree) &&
+	echo treeM $treeM &&
+	git ls-tree $treeM &&
+	cp bozbar bozbar.M &&
+	cp frotz frotz.M &&
+	cp nitfol nitfol.M &&
+	git diff-tree $treeH $treeM
+'
+
+test_expect_success '1, 2, 3 - no carry forward' '
+	rm -f .git/index nitfol bozbar rezrov frotz &&
+	read_tree_u_must_succeed --reset -u $treeH &&
+	read_tree_u_must_succeed -m -u $treeH $treeM &&
+	git ls-files --stage >1-3.out &&
+	cmp M.out 1-3.out &&
+	test_cmp bozbar.M bozbar &&
+	test_cmp frotz.M frotz &&
+	test_cmp nitfol.M nitfol &&
+	check_cache_at bozbar clean &&
+	check_cache_at frotz clean &&
+	check_cache_at nitfol clean
+'
+
+test_expect_success '4 - carry forward local addition.' '
+	rm -f .git/index nitfol bozbar rezrov frotz &&
+	read_tree_u_must_succeed --reset -u $treeH &&
+	echo "+100644 X 0	yomin" >expected &&
+	echo yomin >yomin &&
+	git update-index --add yomin &&
+	read_tree_u_must_succeed -m -u $treeH $treeM &&
+	git ls-files --stage >4.out &&
+	test_might_fail git diff -U0 --no-index M.out 4.out >4diff.out &&
+	compare_change 4diff.out expected &&
+	check_cache_at yomin clean &&
+	test_cmp bozbar.M bozbar &&
+	test_cmp frotz.M frotz &&
+	test_cmp nitfol.M nitfol &&
+	echo yomin >yomin1 &&
+	diff yomin yomin1 &&
+	rm -f yomin1
+'
+
+test_expect_success '5 - carry forward local addition.' '
+	rm -f .git/index nitfol bozbar rezrov frotz &&
+	read_tree_u_must_succeed --reset -u $treeH &&
+	read_tree_u_must_succeed -m -u $treeH &&
+	echo yomin >yomin &&
+	git update-index --add yomin &&
+	echo yomin yomin >yomin &&
+	read_tree_u_must_succeed -m -u $treeH $treeM &&
+	git ls-files --stage >5.out &&
+	test_might_fail git diff -U0 --no-index M.out 5.out >5diff.out &&
+	compare_change 5diff.out expected &&
+	check_cache_at yomin dirty &&
+	test_cmp bozbar.M bozbar &&
+	test_cmp frotz.M frotz &&
+	test_cmp nitfol.M nitfol &&
+	: dirty index should have prevented -u from checking it out. &&
+	echo yomin yomin >yomin1 &&
+	diff yomin yomin1 &&
+	rm -f yomin1
+'
+
+test_expect_success '6 - local addition already has the same.' '
+	rm -f .git/index nitfol bozbar rezrov frotz &&
+	read_tree_u_must_succeed --reset -u $treeH &&
+	echo frotz >frotz &&
+	git update-index --add frotz &&
+	read_tree_u_must_succeed -m -u $treeH $treeM &&
+	git ls-files --stage >6.out &&
+	test_cmp M.out 6.out &&
+	check_cache_at frotz clean &&
+	test_cmp bozbar.M bozbar &&
+	test_cmp frotz.M frotz &&
+	test_cmp nitfol.M nitfol &&
+	echo frotz >frotz1 &&
+	diff frotz frotz1 &&
+	rm -f frotz1
+'
+
+test_expect_success '7 - local addition already has the same.' '
+	rm -f .git/index nitfol bozbar rezrov frotz &&
+	read_tree_u_must_succeed --reset -u $treeH &&
+	echo frotz >frotz &&
+	git update-index --add frotz &&
+	echo frotz frotz >frotz &&
+	read_tree_u_must_succeed -m -u $treeH $treeM &&
+	git ls-files --stage >7.out &&
+	test_cmp M.out 7.out &&
+	check_cache_at frotz dirty &&
+	test_cmp bozbar.M bozbar &&
+	test_cmp nitfol.M nitfol &&
+	: dirty index should have prevented -u from checking it out. &&
+	echo frotz frotz >frotz1 &&
+	diff frotz frotz1 &&
+	rm -f frotz1
+'
+
+test_expect_success '8 - conflicting addition.' '
+	rm -f .git/index nitfol bozbar rezrov frotz &&
+	read_tree_u_must_succeed --reset -u $treeH &&
+	echo frotz frotz >frotz &&
+	git update-index --add frotz &&
+	! read_tree_u_must_succeed -m -u $treeH $treeM
 '
 
-test_expect_success \
-    '11 - dirty path removed.' \
-    'rm -f .git/index nitfol bozbar rezrov frotz &&
-     read_tree_u_must_succeed --reset -u $treeH &&
-     echo rezrov >rezrov &&
-     git update-index --add rezrov &&
-     echo rezrov rezrov >rezrov &&
-     if read_tree_u_must_succeed -m -u $treeH $treeM; then false; else :; fi'
-
-test_expect_success \
-    '12 - unmatching local changes being removed.' \
-    'rm -f .git/index nitfol bozbar rezrov frotz &&
-     read_tree_u_must_succeed --reset -u $treeH &&
-     echo rezrov rezrov >rezrov &&
-     git update-index --add rezrov &&
-     if read_tree_u_must_succeed -m -u $treeH $treeM; then false; else :; fi'
-
-test_expect_success \
-    '13 - unmatching local changes being removed.' \
-    'rm -f .git/index nitfol bozbar rezrov frotz &&
-     read_tree_u_must_succeed --reset -u $treeH &&
-     echo rezrov rezrov >rezrov &&
-     git update-index --add rezrov &&
-     echo rezrov >rezrov &&
-     if read_tree_u_must_succeed -m -u $treeH $treeM; then false; else :; fi'
+test_expect_success '9 - conflicting addition.' '
+	rm -f .git/index nitfol bozbar rezrov frotz &&
+	read_tree_u_must_succeed --reset -u $treeH &&
+	echo frotz frotz >frotz &&
+	git update-index --add frotz &&
+	echo frotz >frotz &&
+	! read_tree_u_must_succeed -m -u $treeH $treeM
+'
+
+test_expect_success '10 - path removed.' '
+	rm -f .git/index nitfol bozbar rezrov frotz &&
+	read_tree_u_must_succeed --reset -u $treeH &&
+	echo rezrov >rezrov &&
+	git update-index --add rezrov &&
+	read_tree_u_must_succeed -m -u $treeH $treeM &&
+	git ls-files --stage >10.out &&
+	cmp M.out 10.out &&
+	test_cmp bozbar.M bozbar &&
+	test_cmp frotz.M frotz &&
+	test_cmp nitfol.M nitfol
+'
+
+test_expect_success '11 - dirty path removed.' '
+	rm -f .git/index nitfol bozbar rezrov frotz &&
+	read_tree_u_must_succeed --reset -u $treeH &&
+	echo rezrov >rezrov &&
+	git update-index --add rezrov &&
+	echo rezrov rezrov >rezrov &&
+	! read_tree_u_must_succeed -m -u $treeH $treeM
+'
+
+test_expect_success '12 - unmatching local changes being removed.' '
+	rm -f .git/index nitfol bozbar rezrov frotz &&
+	read_tree_u_must_succeed --reset -u $treeH &&
+	echo rezrov rezrov >rezrov &&
+	git update-index --add rezrov &&
+	! read_tree_u_must_succeed -m -u $treeH $treeM
+'
+
+test_expect_success '13 - unmatching local changes being removed.' '
+	rm -f .git/index nitfol bozbar rezrov frotz &&
+	read_tree_u_must_succeed --reset -u $treeH &&
+	echo rezrov rezrov >rezrov &&
+	git update-index --add rezrov &&
+	echo rezrov >rezrov &&
+	! read_tree_u_must_succeed -m -u $treeH $treeM
+'
 
 cat >expected <<EOF
 -100644 X 0	nitfol
 +100644 X 0	nitfol
 EOF
 
-test_expect_success \
-    '14 - unchanged in two heads.' \
-    'rm -f .git/index nitfol bozbar rezrov frotz &&
-     read_tree_u_must_succeed --reset -u $treeH &&
-     echo nitfol nitfol >nitfol &&
-     git update-index --add nitfol &&
-     read_tree_u_must_succeed -m -u $treeH $treeM &&
-     git ls-files --stage >14.out &&
-     test_must_fail git diff -U0 --no-index M.out 14.out >14diff.out &&
-     compare_change 14diff.out expected &&
-     test_cmp bozbar.M bozbar &&
-     test_cmp frotz.M frotz &&
-     check_cache_at nitfol clean &&
-     echo nitfol nitfol >nitfol1 &&
-     diff nitfol nitfol1 &&
-     rm -f nitfol1'
-
-test_expect_success \
-    '15 - unchanged in two heads.' \
-    'rm -f .git/index nitfol bozbar rezrov frotz &&
-     read_tree_u_must_succeed --reset -u $treeH &&
-     echo nitfol nitfol >nitfol &&
-     git update-index --add nitfol &&
-     echo nitfol nitfol nitfol >nitfol &&
-     read_tree_u_must_succeed -m -u $treeH $treeM &&
-     git ls-files --stage >15.out &&
-     test_must_fail git diff -U0 --no-index M.out 15.out >15diff.out &&
-     compare_change 15diff.out expected &&
-     check_cache_at nitfol dirty &&
-     test_cmp bozbar.M bozbar &&
-     test_cmp frotz.M frotz &&
-     echo nitfol nitfol nitfol >nitfol1 &&
-     diff nitfol nitfol1 &&
-     rm -f nitfol1'
-
-test_expect_success \
-    '16 - conflicting local change.' \
-    'rm -f .git/index nitfol bozbar rezrov frotz &&
-     read_tree_u_must_succeed --reset -u $treeH &&
-     echo bozbar bozbar >bozbar &&
-     git update-index --add bozbar &&
-     if read_tree_u_must_succeed -m -u $treeH $treeM; then false; else :; fi'
-
-test_expect_success \
-    '17 - conflicting local change.' \
-    'rm -f .git/index nitfol bozbar rezrov frotz &&
-     read_tree_u_must_succeed --reset -u $treeH &&
-     echo bozbar bozbar >bozbar &&
-     git update-index --add bozbar &&
-     echo bozbar bozbar bozbar >bozbar &&
-     if read_tree_u_must_succeed -m -u $treeH $treeM; then false; else :; fi'
-
-test_expect_success \
-    '18 - local change already having a good result.' \
-    'rm -f .git/index nitfol bozbar rezrov frotz &&
-     read_tree_u_must_succeed --reset -u $treeH &&
-     echo gnusto >bozbar &&
-     git update-index --add bozbar &&
-     read_tree_u_must_succeed -m -u $treeH $treeM &&
-     git ls-files --stage >18.out &&
-     test_cmp M.out 18.out &&
-     check_cache_at bozbar clean &&
-     test_cmp bozbar.M bozbar &&
-     test_cmp frotz.M frotz &&
-     test_cmp nitfol.M nitfol
+test_expect_success '14 - unchanged in two heads.' '
+	rm -f .git/index nitfol bozbar rezrov frotz &&
+	read_tree_u_must_succeed --reset -u $treeH &&
+	echo nitfol nitfol >nitfol &&
+	git update-index --add nitfol &&
+	read_tree_u_must_succeed -m -u $treeH $treeM &&
+	git ls-files --stage >14.out &&
+	test_must_fail git diff -U0 --no-index M.out 14.out >14diff.out &&
+	compare_change 14diff.out expected &&
+	test_cmp bozbar.M bozbar &&
+	test_cmp frotz.M frotz &&
+	check_cache_at nitfol clean &&
+	echo nitfol nitfol >nitfol1 &&
+	diff nitfol nitfol1 &&
+	rm -f nitfol1
+'
+
+test_expect_success '15 - unchanged in two heads.' '
+	rm -f .git/index nitfol bozbar rezrov frotz &&
+	read_tree_u_must_succeed --reset -u $treeH &&
+	echo nitfol nitfol >nitfol &&
+	git update-index --add nitfol &&
+	echo nitfol nitfol nitfol >nitfol &&
+	read_tree_u_must_succeed -m -u $treeH $treeM &&
+	git ls-files --stage >15.out &&
+	test_must_fail git diff -U0 --no-index M.out 15.out >15diff.out &&
+	compare_change 15diff.out expected &&
+	check_cache_at nitfol dirty &&
+	test_cmp bozbar.M bozbar &&
+	test_cmp frotz.M frotz &&
+	echo nitfol nitfol nitfol >nitfol1 &&
+	diff nitfol nitfol1 &&
+	rm -f nitfol1
 '
 
-test_expect_success \
-    '19 - local change already having a good result, further modified.' \
-    'rm -f .git/index nitfol bozbar rezrov frotz &&
-     read_tree_u_must_succeed --reset -u $treeH &&
-     echo gnusto >bozbar &&
-     git update-index --add bozbar &&
-     echo gnusto gnusto >bozbar &&
-     read_tree_u_must_succeed -m -u $treeH $treeM &&
-     git ls-files --stage >19.out &&
-     test_cmp M.out 19.out &&
-     check_cache_at bozbar dirty &&
-     test_cmp frotz.M frotz &&
-     test_cmp nitfol.M nitfol &&
-     echo gnusto gnusto >bozbar1 &&
-     diff bozbar bozbar1 &&
-     rm -f bozbar1'
-
-test_expect_success \
-    '20 - no local change, use new tree.' \
-    'rm -f .git/index nitfol bozbar rezrov frotz &&
-     read_tree_u_must_succeed --reset -u $treeH &&
-     echo bozbar >bozbar &&
-     git update-index --add bozbar &&
-     read_tree_u_must_succeed -m -u $treeH $treeM &&
-     git ls-files --stage >20.out &&
-     test_cmp M.out 20.out &&
-     check_cache_at bozbar clean &&
-     test_cmp bozbar.M bozbar &&
-     test_cmp frotz.M frotz &&
-     test_cmp nitfol.M nitfol
+test_expect_success '16 - conflicting local change.' '
+	rm -f .git/index nitfol bozbar rezrov frotz &&
+	read_tree_u_must_succeed --reset -u $treeH &&
+	echo bozbar bozbar >bozbar &&
+	git update-index --add bozbar &&
+	! read_tree_u_must_succeed -m -u $treeH $treeM
 '
 
-test_expect_success \
-    '21 - no local change, dirty cache.' \
-    'rm -f .git/index nitfol bozbar rezrov frotz &&
-     read_tree_u_must_succeed --reset -u $treeH &&
-     echo bozbar >bozbar &&
-     git update-index --add bozbar &&
-     echo gnusto gnusto >bozbar &&
-     if read_tree_u_must_succeed -m -u $treeH $treeM; then false; else :; fi'
+test_expect_success '17 - conflicting local change.' '
+	rm -f .git/index nitfol bozbar rezrov frotz &&
+	read_tree_u_must_succeed --reset -u $treeH &&
+	echo bozbar bozbar >bozbar &&
+	git update-index --add bozbar &&
+	echo bozbar bozbar bozbar >bozbar &&
+	! read_tree_u_must_succeed -m -u $treeH $treeM
+'
+
+test_expect_success '18 - local change already having a good result.' '
+	rm -f .git/index nitfol bozbar rezrov frotz &&
+	read_tree_u_must_succeed --reset -u $treeH &&
+	echo gnusto >bozbar &&
+	git update-index --add bozbar &&
+	read_tree_u_must_succeed -m -u $treeH $treeM &&
+	git ls-files --stage >18.out &&
+	test_cmp M.out 18.out &&
+	check_cache_at bozbar clean &&
+	test_cmp bozbar.M bozbar &&
+	test_cmp frotz.M frotz &&
+	test_cmp nitfol.M nitfol
+'
+
+test_expect_success '19 - local change already having a good result, further modified.' '
+	rm -f .git/index nitfol bozbar rezrov frotz &&
+	read_tree_u_must_succeed --reset -u $treeH &&
+	echo gnusto >bozbar &&
+	git update-index --add bozbar &&
+	echo gnusto gnusto >bozbar &&
+	read_tree_u_must_succeed -m -u $treeH $treeM &&
+	git ls-files --stage >19.out &&
+	test_cmp M.out 19.out &&
+	check_cache_at bozbar dirty &&
+	test_cmp frotz.M frotz &&
+	test_cmp nitfol.M nitfol &&
+	echo gnusto gnusto >bozbar1 &&
+	diff bozbar bozbar1 &&
+	rm -f bozbar1
+'
+
+test_expect_success '20 - no local change, use new tree.' '
+	rm -f .git/index nitfol bozbar rezrov frotz &&
+	read_tree_u_must_succeed --reset -u $treeH &&
+	echo bozbar >bozbar &&
+	git update-index --add bozbar &&
+	read_tree_u_must_succeed -m -u $treeH $treeM &&
+	git ls-files --stage >20.out &&
+	test_cmp M.out 20.out &&
+	check_cache_at bozbar clean &&
+	test_cmp bozbar.M bozbar &&
+	test_cmp frotz.M frotz &&
+	test_cmp nitfol.M nitfol
+'
+
+test_expect_success '21 - no local change, dirty cache.' '
+	rm -f .git/index nitfol bozbar rezrov frotz &&
+	read_tree_u_must_succeed --reset -u $treeH &&
+	echo bozbar >bozbar &&
+	git update-index --add bozbar &&
+	echo gnusto gnusto >bozbar &&
+	! read_tree_u_must_succeed -m -u $treeH $treeM
+'
 
 # Also make sure we did not break DF vs DF/DF case.
-test_expect_success \
-    'DF vs DF/DF case setup.' \
-    'rm -f .git/index &&
-     echo DF >DF &&
-     git update-index --add DF &&
-     treeDF=$(git write-tree) &&
-     echo treeDF $treeDF &&
-     git ls-tree $treeDF &&
-
-     rm -f DF &&
-     mkdir DF &&
-     echo DF/DF >DF/DF &&
-     git update-index --add --remove DF DF/DF &&
-     treeDFDF=$(git write-tree) &&
-     echo treeDFDF $treeDFDF &&
-     git ls-tree $treeDFDF &&
-     git ls-files --stage >DFDF.out'
-
-test_expect_success \
-    'DF vs DF/DF case test.' \
-    'rm -f .git/index &&
-     rm -fr DF &&
-     echo DF >DF &&
-     git update-index --add DF &&
-     read_tree_u_must_succeed -m -u $treeDF $treeDFDF &&
-     git ls-files --stage >DFDFcheck.out &&
-     test_cmp DFDF.out DFDFcheck.out &&
-     check_cache_at DF/DF clean'
+test_expect_success 'DF vs DF/DF case setup.' '
+	rm -f .git/index &&
+	echo DF >DF &&
+	git update-index --add DF &&
+	treeDF=$(git write-tree) &&
+	echo treeDF $treeDF &&
+	git ls-tree $treeDF &&
+
+	rm -f DF &&
+	mkdir DF &&
+	echo DF/DF >DF/DF &&
+	git update-index --add --remove DF DF/DF &&
+	treeDFDF=$(git write-tree) &&
+	echo treeDFDF $treeDFDF &&
+	git ls-tree $treeDFDF &&
+	git ls-files --stage >DFDF.out
+'
+
+test_expect_success 'DF vs DF/DF case test.' '
+	rm -f .git/index &&
+	rm -fr DF &&
+	echo DF >DF &&
+	git update-index --add DF &&
+	read_tree_u_must_succeed -m -u $treeDF $treeDFDF &&
+	git ls-files --stage >DFDFcheck.out &&
+	test_cmp DFDF.out DFDFcheck.out &&
+	check_cache_at DF/DF clean
+'
 
 test_done
diff --git a/t/t1003-read-tree-prefix.sh b/t/t1003-read-tree-prefix.sh
index b6111cd..c860c08 100755
--- a/t/t1003-read-tree-prefix.sh
+++ b/t/t1003-read-tree-prefix.sh
@@ -6,6 +6,7 @@
 test_description='git read-tree --prefix test.
 '
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -24,4 +25,14 @@ test_expect_success 'read-tree --prefix' '
 	cmp expect actual
 '
 
+test_expect_success 'read-tree --prefix with leading slash exits with error' '
+	git rm -rf . &&
+	test_must_fail git read-tree --prefix=/two/ $tree &&
+	git read-tree --prefix=two/ $tree &&
+
+	git rm -rf . &&
+	test_must_fail git read-tree --prefix=/ $tree &&
+	git read-tree --prefix= $tree
+'
+
 test_done
diff --git a/t/t1004-read-tree-m-u-wf.sh b/t/t1004-read-tree-m-u-wf.sh
index c13578a..11bf104 100755
--- a/t/t1004-read-tree-m-u-wf.sh
+++ b/t/t1004-read-tree-m-u-wf.sh
@@ -2,6 +2,9 @@
 
 test_description='read-tree -m -u checks working tree files'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-read-tree.sh
 
@@ -20,17 +23,17 @@ test_expect_success 'two-way setup' '
 	git branch side &&
 	git tag -f branch-point &&
 
-	echo file2 is not tracked on the master anymore &&
+	echo file2 is not tracked on the main branch anymore &&
 	rm -f file2 subdir/file2 &&
 	git update-index --remove file2 subdir/file2 &&
-	git commit -a -m "master removes file2 and subdir/file2"
+	git commit -a -m "main removes file2 and subdir/file2"
 '
 
 test_expect_success 'two-way not clobbering' '
 
-	echo >file2 master creates untracked file2 &&
-	echo >subdir/file2 master creates untracked subdir/file2 &&
-	if err=$(read_tree_u_must_succeed -m -u master side 2>&1)
+	echo >file2 main creates untracked file2 &&
+	echo >subdir/file2 main creates untracked subdir/file2 &&
+	if err=$(read_tree_u_must_succeed -m -u main side 2>&1)
 	then
 		echo should have complained
 		false
@@ -43,7 +46,7 @@ echo file2 >.gitignore
 
 test_expect_success 'two-way with incorrect --exclude-per-directory (1)' '
 
-	if err=$(read_tree_u_must_succeed -m --exclude-per-directory=.gitignore master side 2>&1)
+	if err=$(read_tree_u_must_succeed -m --exclude-per-directory=.gitignore main side 2>&1)
 	then
 		echo should have complained
 		false
@@ -54,7 +57,7 @@ test_expect_success 'two-way with incorrect --exclude-per-directory (1)' '
 
 test_expect_success 'two-way with incorrect --exclude-per-directory (2)' '
 
-	if err=$(read_tree_u_must_succeed -m -u --exclude-per-directory=foo --exclude-per-directory=.gitignore master side 2>&1)
+	if err=$(read_tree_u_must_succeed -m -u --exclude-per-directory=foo --exclude-per-directory=.gitignore main side 2>&1)
 	then
 		echo should have complained
 		false
@@ -65,7 +68,7 @@ test_expect_success 'two-way with incorrect --exclude-per-directory (2)' '
 
 test_expect_success 'two-way clobbering a ignored file' '
 
-	read_tree_u_must_succeed -m -u --exclude-per-directory=.gitignore master side
+	read_tree_u_must_succeed -m -u --exclude-per-directory=.gitignore main side
 '
 
 rm -f .gitignore
@@ -81,21 +84,21 @@ test_expect_success 'three-way not complaining on an untracked path in both' '
 	git update-index --add file3 subdir/file3 &&
 	git commit -a -m "side adds file3 and removes file2" &&
 
-	git checkout master &&
-	echo >file2 file two is untracked on the master side &&
-	echo >subdir/file2 file two is untracked on the master side &&
+	git checkout main &&
+	echo >file2 file two is untracked on the main side &&
+	echo >subdir/file2 file two is untracked on the main side &&
 
-	read_tree_u_must_succeed -m -u branch-point master side
+	read_tree_u_must_succeed -m -u branch-point main side
 '
 
 test_expect_success 'three-way not clobbering a working tree file' '
 
 	git reset --hard &&
 	rm -f file2 subdir/file2 file3 subdir/file3 &&
-	git checkout master &&
-	echo >file3 file three created in master, untracked &&
-	echo >subdir/file3 file three created in master, untracked &&
-	if err=$(read_tree_u_must_succeed -m -u branch-point master side 2>&1)
+	git checkout main &&
+	echo >file3 file three created in main, untracked &&
+	echo >subdir/file3 file three created in main, untracked &&
+	if err=$(read_tree_u_must_succeed -m -u branch-point main side 2>&1)
 	then
 		echo should have complained
 		false
@@ -110,11 +113,11 @@ test_expect_success 'three-way not complaining on an untracked file' '
 
 	git reset --hard &&
 	rm -f file2 subdir/file2 file3 subdir/file3 &&
-	git checkout master &&
-	echo >file3 file three created in master, untracked &&
-	echo >subdir/file3 file three created in master, untracked &&
+	git checkout main &&
+	echo >file3 file three created in main, untracked &&
+	echo >subdir/file3 file three created in main, untracked &&
 
-	read_tree_u_must_succeed -m -u --exclude-per-directory=.gitignore branch-point master side
+	read_tree_u_must_succeed -m -u --exclude-per-directory=.gitignore branch-point main side
 '
 
 test_expect_success '3-way not overwriting local changes (setup)' '
diff --git a/t/t1005-read-tree-reset.sh b/t/t1005-read-tree-reset.sh
index 83b09e1..26be4a2 100755
--- a/t/t1005-read-tree-reset.sh
+++ b/t/t1005-read-tree-reset.sh
@@ -2,6 +2,7 @@
 
 test_description='read-tree -u --reset'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-read-tree.sh
 
@@ -40,7 +41,8 @@ test_expect_success 'reset should remove remnants from a failed merge' '
 	git ls-files -s &&
 	read_tree_u_must_succeed --reset -u HEAD &&
 	git ls-files -s >actual &&
-	! test -f old
+	! test -f old &&
+	test_cmp expect actual
 '
 
 test_expect_success 'two-way reset should remove remnants too' '
@@ -55,7 +57,8 @@ test_expect_success 'two-way reset should remove remnants too' '
 	git ls-files -s &&
 	read_tree_u_must_succeed --reset -u HEAD HEAD &&
 	git ls-files -s >actual &&
-	! test -f old
+	! test -f old &&
+	test_cmp expect actual
 '
 
 test_expect_success 'Porcelain reset should remove remnants too' '
@@ -70,7 +73,8 @@ test_expect_success 'Porcelain reset should remove remnants too' '
 	git ls-files -s &&
 	git reset --hard &&
 	git ls-files -s >actual &&
-	! test -f old
+	! test -f old &&
+	test_cmp expect actual
 '
 
 test_expect_success 'Porcelain checkout -f should remove remnants too' '
@@ -85,7 +89,8 @@ test_expect_success 'Porcelain checkout -f should remove remnants too' '
 	git ls-files -s &&
 	git checkout -f &&
 	git ls-files -s >actual &&
-	! test -f old
+	! test -f old &&
+	test_cmp expect actual
 '
 
 test_expect_success 'Porcelain checkout -f HEAD should remove remnants too' '
@@ -100,7 +105,8 @@ test_expect_success 'Porcelain checkout -f HEAD should remove remnants too' '
 	git ls-files -s &&
 	git checkout -f HEAD &&
 	git ls-files -s >actual &&
-	! test -f old
+	! test -f old &&
+	test_cmp expect actual
 '
 
 test_done
diff --git a/t/t1006-cat-file.sh b/t/t1006-cat-file.sh
index 2f501d2..e12b221 100755
--- a/t/t1006-cat-file.sh
+++ b/t/t1006-cat-file.sh
@@ -4,96 +4,208 @@ test_description='git cat-file'
 
 . ./test-lib.sh
 
+test_cmdmode_usage () {
+	test_expect_code 129 "$@" 2>err &&
+	grep "^error: .* cannot be used together" err
+}
+
+for switches in \
+	'-e -p' \
+	'-p -t' \
+	'-t -s' \
+	'-s --textconv' \
+	'--textconv --filters' \
+	'--batch-all-objects -e'
+do
+	test_expect_success "usage: cmdmode $switches" '
+		test_cmdmode_usage git cat-file $switches
+	'
+done
+
+test_incompatible_usage () {
+	test_expect_code 129 "$@" 2>err &&
+	grep -E "^(fatal|error):.*(requires|incompatible with|needs)" err
+}
+
+for opt in --batch --batch-check
+do
+	test_expect_success "usage: incompatible options: --path with $opt" '
+		test_incompatible_usage git cat-file --path=foo $opt
+	'
+done
+
+test_missing_usage () {
+	test_expect_code 129 "$@" 2>err &&
+	grep -E "^fatal:.*required" err
+}
+
+short_modes="-e -p -t -s"
+cw_modes="--textconv --filters"
+
+for opt in $cw_modes
+do
+	test_expect_success "usage: $opt requires another option" '
+		test_missing_usage git cat-file $opt
+	'
+done
+
+for opt in $short_modes
+do
+	test_expect_success "usage: $opt requires another option" '
+		test_missing_usage git cat-file $opt
+	'
+
+	for opt2 in --batch \
+		--batch-check \
+		--follow-symlinks \
+		"--path=foo HEAD:some-path.txt"
+	do
+		test_expect_success "usage: incompatible options: $opt and $opt2" '
+			test_incompatible_usage git cat-file $opt $opt2
+		'
+	done
+done
+
+test_too_many_arguments () {
+	test_expect_code 129 "$@" 2>err &&
+	grep -E "^fatal: too many arguments$" err
+}
+
+for opt in $short_modes $cw_modes
+do
+	args="one two three"
+	test_expect_success "usage: too many arguments: $opt $args" '
+		test_too_many_arguments git cat-file $opt $args
+	'
+
+	for opt2 in --buffer --follow-symlinks
+	do
+		test_expect_success "usage: incompatible arguments: $opt with batch option $opt2" '
+			test_incompatible_usage git cat-file $opt $opt2
+		'
+	done
+done
+
+for opt in --buffer \
+	--follow-symlinks \
+	--batch-all-objects \
+	-z \
+	-Z
+do
+	test_expect_success "usage: bad option combination: $opt without batch mode" '
+		test_incompatible_usage git cat-file $opt &&
+		test_incompatible_usage git cat-file $opt commit HEAD
+	'
+done
+
 echo_without_newline () {
     printf '%s' "$*"
 }
 
-strlen () {
-    echo_without_newline "$1" | wc -c | sed -e 's/^ *//'
+echo_without_newline_nul () {
+	echo_without_newline "$@" | tr '\n' '\0'
 }
 
-maybe_remove_timestamp () {
-    if test -z "$2"; then
-        echo_without_newline "$1"
-    else
-	echo_without_newline "$(printf '%s\n' "$1" | sed -e 's/ [0-9][0-9]* [-+][0-9][0-9][0-9][0-9]$//')"
-    fi
+strlen () {
+    echo_without_newline "$1" | wc -c | sed -e 's/^ *//'
 }
 
 run_tests () {
     type=$1
-    sha1=$2
+    oid=$2
     size=$3
     content=$4
     pretty_content=$5
-    no_ts=$6
 
-    batch_output="$sha1 $type $size
+    batch_output="$oid $type $size
 $content"
 
     test_expect_success "$type exists" '
-	git cat-file -e $sha1
+	git cat-file -e $oid
     '
 
     test_expect_success "Type of $type is correct" '
 	echo $type >expect &&
-	git cat-file -t $sha1 >actual &&
+	git cat-file -t $oid >actual &&
 	test_cmp expect actual
     '
 
     test_expect_success "Size of $type is correct" '
 	echo $size >expect &&
-	git cat-file -s $sha1 >actual &&
+	git cat-file -s $oid >actual &&
 	test_cmp expect actual
     '
 
     test_expect_success "Type of $type is correct using --allow-unknown-type" '
 	echo $type >expect &&
-	git cat-file -t --allow-unknown-type $sha1 >actual &&
+	git cat-file -t --allow-unknown-type $oid >actual &&
 	test_cmp expect actual
     '
 
     test_expect_success "Size of $type is correct using --allow-unknown-type" '
 	echo $size >expect &&
-	git cat-file -s --allow-unknown-type $sha1 >actual &&
+	git cat-file -s --allow-unknown-type $oid >actual &&
 	test_cmp expect actual
     '
 
     test -z "$content" ||
     test_expect_success "Content of $type is correct" '
-	maybe_remove_timestamp "$content" $no_ts >expect &&
-	maybe_remove_timestamp "$(git cat-file $type $sha1)" $no_ts >actual &&
+	echo_without_newline "$content" >expect &&
+	git cat-file $type $oid >actual &&
 	test_cmp expect actual
     '
 
     test_expect_success "Pretty content of $type is correct" '
-	maybe_remove_timestamp "$pretty_content" $no_ts >expect &&
-	maybe_remove_timestamp "$(git cat-file -p $sha1)" $no_ts >actual &&
+	echo_without_newline "$pretty_content" >expect &&
+	git cat-file -p $oid >actual &&
 	test_cmp expect actual
     '
 
     test -z "$content" ||
     test_expect_success "--batch output of $type is correct" '
-	maybe_remove_timestamp "$batch_output" $no_ts >expect &&
-	maybe_remove_timestamp "$(echo $sha1 | git cat-file --batch)" $no_ts >actual &&
+	echo "$batch_output" >expect &&
+	echo $oid | git cat-file --batch >actual &&
 	test_cmp expect actual
     '
 
     test_expect_success "--batch-check output of $type is correct" '
-	echo "$sha1 $type $size" >expect &&
-	echo_without_newline $sha1 | git cat-file --batch-check >actual &&
+	echo "$oid $type $size" >expect &&
+	echo_without_newline $oid | git cat-file --batch-check >actual &&
 	test_cmp expect actual
     '
 
+    for opt in --buffer --no-buffer
+    do
+	test -z "$content" ||
+		test_expect_success "--batch-command $opt output of $type content is correct" '
+		echo "$batch_output" >expect &&
+		test_write_lines "contents $oid" | git cat-file --batch-command $opt >actual &&
+		test_cmp expect actual
+	'
+
+	test_expect_success "--batch-command $opt output of $type info is correct" '
+		echo "$oid $type $size" >expect &&
+		test_write_lines "info $oid" |
+		git cat-file --batch-command $opt >actual &&
+		test_cmp expect actual
+	'
+    done
+
     test_expect_success "custom --batch-check format" '
-	echo "$type $sha1" >expect &&
-	echo $sha1 | git cat-file --batch-check="%(objecttype) %(objectname)" >actual &&
+	echo "$type $oid" >expect &&
+	echo $oid | git cat-file --batch-check="%(objecttype) %(objectname)" >actual &&
+	test_cmp expect actual
+    '
+
+    test_expect_success "custom --batch-command format" '
+	echo "$type $oid" >expect &&
+	echo "info $oid" | git cat-file --batch-command="%(objecttype) %(objectname)" >actual &&
 	test_cmp expect actual
     '
 
     test_expect_success '--batch-check with %(rest)' '
 	echo "$type this is some extra content" >expect &&
-	echo "$sha1    this is some extra content" |
+	echo "$oid    this is some extra content" |
 		git cat-file --batch-check="%(objecttype) %(rest)" >actual &&
 	test_cmp expect actual
     '
@@ -102,10 +214,9 @@ $content"
     test_expect_success "--batch without type ($type)" '
 	{
 		echo "$size" &&
-		maybe_remove_timestamp "$content" $no_ts
+		echo "$content"
 	} >expect &&
-	echo $sha1 | git cat-file --batch="%(objectsize)" >actual.full &&
-	maybe_remove_timestamp "$(cat actual.full)" $no_ts >actual &&
+	echo $oid | git cat-file --batch="%(objectsize)" >actual &&
 	test_cmp expect actual
     '
 
@@ -113,126 +224,200 @@ $content"
     test_expect_success "--batch without size ($type)" '
 	{
 		echo "$type" &&
-		maybe_remove_timestamp "$content" $no_ts
+		echo "$content"
 	} >expect &&
-	echo $sha1 | git cat-file --batch="%(objecttype)" >actual.full &&
-	maybe_remove_timestamp "$(cat actual.full)" $no_ts >actual &&
+	echo $oid | git cat-file --batch="%(objecttype)" >actual &&
 	test_cmp expect actual
     '
 }
 
 hello_content="Hello World"
 hello_size=$(strlen "$hello_content")
-hello_sha1=$(echo_without_newline "$hello_content" | git hash-object --stdin)
+hello_oid=$(echo_without_newline "$hello_content" | git hash-object --stdin)
 
 test_expect_success "setup" '
+	git config core.repositoryformatversion 1 &&
+	git config extensions.objectformat $test_hash_algo &&
+	git config extensions.compatobjectformat $test_compat_hash_algo &&
 	echo_without_newline "$hello_content" > hello &&
 	git update-index --add hello
 '
 
-run_tests 'blob' $hello_sha1 $hello_size "$hello_content" "$hello_content"
+run_blob_tests () {
+    oid=$1
+
+    run_tests 'blob' $oid $hello_size "$hello_content" "$hello_content"
+
+    test_expect_success '--batch-command --buffer with flush for blob info' '
+	echo "$oid blob $hello_size" >expect &&
+	test_write_lines "info $oid" "flush" |
+	GIT_TEST_CAT_FILE_NO_FLUSH_ON_EXIT=1 \
+	git cat-file --batch-command --buffer >actual &&
+	test_cmp expect actual
+    '
+
+    test_expect_success '--batch-command --buffer without flush for blob info' '
+	touch output &&
+	test_write_lines "info $oid" |
+	GIT_TEST_CAT_FILE_NO_FLUSH_ON_EXIT=1 \
+	git cat-file --batch-command --buffer >>output &&
+	test_must_be_empty output
+    '
+}
+
+hello_compat_oid=$(git rev-parse --output-object-format=$test_compat_hash_algo $hello_oid)
+run_blob_tests $hello_oid
+run_blob_tests $hello_compat_oid
 
 test_expect_success '--batch-check without %(rest) considers whole line' '
-	echo "$hello_sha1 blob $hello_size" >expect &&
-	git update-index --add --cacheinfo 100644 $hello_sha1 "white space" &&
+	echo "$hello_oid blob $hello_size" >expect &&
+	git update-index --add --cacheinfo 100644 $hello_oid "white space" &&
 	test_when_finished "git update-index --remove \"white space\"" &&
 	echo ":white space" | git cat-file --batch-check >actual &&
 	test_cmp expect actual
 '
 
-tree_sha1=$(git write-tree)
+tree_oid=$(git write-tree)
+tree_compat_oid=$(git rev-parse --output-object-format=$test_compat_hash_algo $tree_oid)
 tree_size=$(($(test_oid rawsz) + 13))
-tree_pretty_content="100644 blob $hello_sha1	hello"
+tree_compat_size=$(($(test_oid --hash=compat rawsz) + 13))
+tree_pretty_content="100644 blob $hello_oid	hello${LF}"
+tree_compat_pretty_content="100644 blob $hello_compat_oid	hello${LF}"
 
-run_tests 'tree' $tree_sha1 $tree_size "" "$tree_pretty_content"
+run_tests 'tree' $tree_oid $tree_size "" "$tree_pretty_content"
+run_tests 'tree' $tree_compat_oid $tree_compat_size "" "$tree_compat_pretty_content"
 
 commit_message="Initial commit"
-commit_sha1=$(echo_without_newline "$commit_message" | git commit-tree $tree_sha1)
+commit_oid=$(echo_without_newline "$commit_message" | git commit-tree $tree_oid)
+commit_compat_oid=$(git rev-parse --output-object-format=$test_compat_hash_algo $commit_oid)
 commit_size=$(($(test_oid hexsz) + 137))
-commit_content="tree $tree_sha1
-author $GIT_AUTHOR_NAME <$GIT_AUTHOR_EMAIL> 0000000000 +0000
-committer $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> 0000000000 +0000
+commit_compat_size=$(($(test_oid --hash=compat hexsz) + 137))
+commit_content="tree $tree_oid
+author $GIT_AUTHOR_NAME <$GIT_AUTHOR_EMAIL> $GIT_AUTHOR_DATE
+committer $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> $GIT_COMMITTER_DATE
+
+$commit_message"
+
+commit_compat_content="tree $tree_compat_oid
+author $GIT_AUTHOR_NAME <$GIT_AUTHOR_EMAIL> $GIT_AUTHOR_DATE
+committer $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> $GIT_COMMITTER_DATE
 
 $commit_message"
 
-run_tests 'commit' $commit_sha1 $commit_size "$commit_content" "$commit_content" 1
+run_tests 'commit' $commit_oid $commit_size "$commit_content" "$commit_content"
+run_tests 'commit' $commit_compat_oid $commit_compat_size "$commit_compat_content" "$commit_compat_content"
 
-tag_header_without_timestamp="object $hello_sha1
-type blob
+tag_header_without_oid="type blob
 tag hellotag
 tagger $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL>"
+tag_header_without_timestamp="object $hello_oid
+$tag_header_without_oid"
+tag_compat_header_without_timestamp="object $hello_compat_oid
+$tag_header_without_oid"
 tag_description="This is a tag"
-tag_content="$tag_header_without_timestamp 0000000000 +0000
+tag_content="$tag_header_without_timestamp 0 +0000
 
 $tag_description"
+tag_compat_content="$tag_compat_header_without_timestamp 0 +0000
 
-tag_sha1=$(echo_without_newline "$tag_content" | git mktag)
+$tag_description"
+
+tag_oid=$(echo_without_newline "$tag_content" | git hash-object -t tag --stdin -w)
 tag_size=$(strlen "$tag_content")
 
-run_tests 'tag' $tag_sha1 $tag_size "$tag_content" "$tag_content" 1
+tag_compat_oid=$(git rev-parse --output-object-format=$test_compat_hash_algo $tag_oid)
+tag_compat_size=$(strlen "$tag_compat_content")
 
-test_expect_success \
-    "Reach a blob from a tag pointing to it" \
-    "test '$hello_content' = \"\$(git cat-file blob $tag_sha1)\""
+run_tests 'tag' $tag_oid $tag_size "$tag_content" "$tag_content"
+run_tests 'tag' $tag_compat_oid $tag_compat_size "$tag_compat_content" "$tag_compat_content"
+
+test_expect_success "Reach a blob from a tag pointing to it" '
+	echo_without_newline "$hello_content" >expect &&
+	git cat-file blob $tag_oid >actual &&
+	test_cmp expect actual
+'
 
-for batch in batch batch-check
+for oid in $hello_oid $hello_compat_oid
 do
-    for opt in t s e p
+    for batch in batch batch-check batch-command
     do
+	for opt in t s e p
+	do
 	test_expect_success "Passing -$opt with --$batch fails" '
-	    test_must_fail git cat-file --$batch -$opt $hello_sha1
+	    test_must_fail git cat-file --$batch -$opt $oid
 	'
 
 	test_expect_success "Passing --$batch with -$opt fails" '
-	    test_must_fail git cat-file -$opt --$batch $hello_sha1
+	    test_must_fail git cat-file -$opt --$batch $oid
 	'
-    done
+	done
 
-    test_expect_success "Passing <type> with --$batch fails" '
-	test_must_fail git cat-file --$batch blob $hello_sha1
-    '
+	test_expect_success "Passing <type> with --$batch fails" '
+	test_must_fail git cat-file --$batch blob $oid
+	'
 
-    test_expect_success "Passing --$batch with <type> fails" '
-	test_must_fail git cat-file blob --$batch $hello_sha1
-    '
+	test_expect_success "Passing --$batch with <type> fails" '
+	test_must_fail git cat-file blob --$batch $oid
+	'
 
-    test_expect_success "Passing sha1 with --$batch fails" '
-	test_must_fail git cat-file --$batch $hello_sha1
-    '
+	test_expect_success "Passing oid with --$batch fails" '
+	test_must_fail git cat-file --$batch $oid
+	'
+    done
 done
 
-for opt in t s e p
+for oid in $hello_oid $hello_compat_oid
 do
-    test_expect_success "Passing -$opt with --follow-symlinks fails" '
-	    test_must_fail git cat-file --follow-symlinks -$opt $hello_sha1
+    for opt in t s e p
+    do
+	test_expect_success "Passing -$opt with --follow-symlinks fails" '
+	    test_must_fail git cat-file --follow-symlinks -$opt $oid
 	'
+    done
 done
 
 test_expect_success "--batch-check for a non-existent named object" '
-    test "foobar42 missing
-foobar84 missing" = \
-    "$( ( echo foobar42; echo_without_newline foobar84; ) | git cat-file --batch-check)"
+	cat >expect <<-EOF &&
+	foobar42 missing
+	foobar84 missing
+	EOF
+
+	printf "foobar42\nfoobar84" >in &&
+	git cat-file --batch-check <in >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success "--batch-check for a non-existent hash" '
-    test "0000000000000000000000000000000000000042 missing
-0000000000000000000000000000000000000084 missing" = \
-    "$( ( echo 0000000000000000000000000000000000000042;
-	 echo_without_newline 0000000000000000000000000000000000000084; ) |
-       git cat-file --batch-check)"
+	cat >expect <<-EOF &&
+	0000000000000000000000000000000000000042 missing
+	0000000000000000000000000000000000000084 missing
+	EOF
+
+	printf "0000000000000000000000000000000000000042\n0000000000000000000000000000000000000084" >in &&
+	git cat-file --batch-check <in >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success "--batch for an existent and a non-existent hash" '
-    test "$tag_sha1 tag $tag_size
-$tag_content
-0000000000000000000000000000000000000000 missing" = \
-    "$( ( echo $tag_sha1;
-	 echo_without_newline 0000000000000000000000000000000000000000; ) |
-       git cat-file --batch)"
+	cat >expect <<-EOF &&
+	$tag_oid tag $tag_size
+	$tag_content
+	0000000000000000000000000000000000000000 missing
+	EOF
+
+	printf "$tag_oid\n0000000000000000000000000000000000000000" >in &&
+	git cat-file --batch <in >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success "--batch-check for an empty line" '
-    test " missing" = "$(echo | git cat-file --batch-check)"
+	cat >expect <<-EOF &&
+	 missing
+	EOF
+
+	echo >in &&
+	git cat-file --batch-check <in >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success 'empty --batch-check notices missing object' '
@@ -241,49 +426,185 @@ test_expect_success 'empty --batch-check notices missing object' '
 	test_cmp expect actual
 '
 
-batch_input="$hello_sha1
-$commit_sha1
-$tag_sha1
+batch_tests () {
+    boid=$1
+    loid=$2
+    lsize=$3
+    coid=$4
+    csize=$5
+    ccontent=$6
+    toid=$7
+    tsize=$8
+    tcontent=$9
+
+    batch_input="$boid
+$coid
+$toid
 deadbeef
 
 "
 
-batch_output="$hello_sha1 blob $hello_size
-$hello_content
-$commit_sha1 commit $commit_size
-$commit_content
-$tag_sha1 tag $tag_size
-$tag_content
-deadbeef missing
- missing"
+    printf "%s\0" \
+	"$boid blob $hello_size" \
+	"$hello_content" \
+	"$coid commit $csize" \
+	"$ccontent" \
+	"$toid tag $tsize" \
+	"$tcontent" \
+	"deadbeef missing" \
+	" missing" >batch_output
+
+    test_expect_success '--batch with multiple oids gives correct format' '
+	tr "\0" "\n" <batch_output >expect &&
+	echo_without_newline "$batch_input" >in &&
+	git cat-file --batch <in >actual &&
+	test_cmp expect actual
+    '
 
-test_expect_success '--batch with multiple sha1s gives correct format' '
-	test "$(maybe_remove_timestamp "$batch_output" 1)" = "$(maybe_remove_timestamp "$(echo_without_newline "$batch_input" | git cat-file --batch)" 1)"
-'
+    test_expect_success '--batch, -z with multiple oids gives correct format' '
+	echo_without_newline_nul "$batch_input" >in &&
+	tr "\0" "\n" <batch_output >expect &&
+	git cat-file --batch -z <in >actual &&
+	test_cmp expect actual
+    '
 
-batch_check_input="$hello_sha1
-$tree_sha1
-$commit_sha1
-$tag_sha1
+    test_expect_success '--batch, -Z with multiple oids gives correct format' '
+	echo_without_newline_nul "$batch_input" >in &&
+	git cat-file --batch -Z <in >actual &&
+	test_cmp batch_output actual
+    '
+
+batch_check_input="$boid
+$loid
+$coid
+$toid
 deadbeef
 
 "
 
-batch_check_output="$hello_sha1 blob $hello_size
-$tree_sha1 tree $tree_size
-$commit_sha1 commit $commit_size
-$tag_sha1 tag $tag_size
-deadbeef missing
- missing"
+    printf "%s\0" \
+	"$boid blob $hello_size" \
+	"$loid tree $lsize" \
+	"$coid commit $csize" \
+	"$toid tag $tsize" \
+	"deadbeef missing" \
+	" missing" >batch_check_output
+
+    test_expect_success "--batch-check with multiple oids gives correct format" '
+	tr "\0" "\n" <batch_check_output >expect &&
+	echo_without_newline "$batch_check_input" >in &&
+	git cat-file --batch-check <in >actual &&
+	test_cmp expect actual
+    '
+
+    test_expect_success "--batch-check, -z with multiple oids gives correct format" '
+	tr "\0" "\n" <batch_check_output >expect &&
+	echo_without_newline_nul "$batch_check_input" >in &&
+	git cat-file --batch-check -z <in >actual &&
+	test_cmp expect actual
+    '
+
+    test_expect_success "--batch-check, -Z with multiple oids gives correct format" '
+	echo_without_newline_nul "$batch_check_input" >in &&
+	git cat-file --batch-check -Z <in >actual &&
+	test_cmp batch_check_output actual
+    '
+
+batch_command_multiple_info="info $boid
+info $loid
+info $coid
+info $toid
+info deadbeef"
+
+    test_expect_success '--batch-command with multiple info calls gives correct format' '
+	cat >expect <<-EOF &&
+	$boid blob $hello_size
+	$loid tree $lsize
+	$coid commit $csize
+	$toid tag $tsize
+	deadbeef missing
+	EOF
+
+	echo "$batch_command_multiple_info" >in &&
+	git cat-file --batch-command --buffer <in >actual &&
+
+	test_cmp expect actual &&
+
+	echo "$batch_command_multiple_info" | tr "\n" "\0" >in &&
+	git cat-file --batch-command --buffer -z <in >actual &&
+
+	test_cmp expect actual &&
+
+	echo "$batch_command_multiple_info" | tr "\n" "\0" >in &&
+	tr "\n" "\0" <expect >expect_nul &&
+	git cat-file --batch-command --buffer -Z <in >actual &&
+
+	test_cmp expect_nul actual
+    '
+
+batch_command_multiple_contents="contents $boid
+contents $coid
+contents $toid
+contents deadbeef
+flush"
+
+    test_expect_success '--batch-command with multiple command calls gives correct format' '
+	printf "%s\0" \
+		"$boid blob $hello_size" \
+		"$hello_content" \
+		"$coid commit $csize" \
+		"$ccontent" \
+		"$toid tag $tsize" \
+		"$tcontent" \
+		"deadbeef missing" >expect_nul &&
+	tr "\0" "\n" <expect_nul >expect &&
+
+	echo "$batch_command_multiple_contents" >in &&
+	git cat-file --batch-command --buffer <in >actual &&
+
+	test_cmp expect actual &&
+
+	echo "$batch_command_multiple_contents" | tr "\n" "\0" >in &&
+	git cat-file --batch-command --buffer -z <in >actual &&
+
+	test_cmp expect actual &&
+
+	echo "$batch_command_multiple_contents" | tr "\n" "\0" >in &&
+	git cat-file --batch-command --buffer -Z <in >actual &&
+
+	test_cmp expect_nul actual
+    '
+
+}
+
+batch_tests $hello_oid $tree_oid $tree_size $commit_oid $commit_size "$commit_content" $tag_oid $tag_size "$tag_content"
+batch_tests $hello_compat_oid $tree_compat_oid $tree_compat_size $commit_compat_oid $commit_compat_size "$commit_compat_content" $tag_compat_oid $tag_compat_size "$tag_compat_content"
+
+
+test_expect_success FUNNYNAMES 'setup with newline in input' '
+	touch -- "newline${LF}embedded" &&
+	git add -- "newline${LF}embedded" &&
+	git commit -m "file with newline embedded" &&
+	test_tick &&
 
-test_expect_success "--batch-check with multiple sha1s gives correct format" '
-    test "$batch_check_output" = \
-    "$(echo_without_newline "$batch_check_input" | git cat-file --batch-check)"
+	printf "HEAD:newline${LF}embedded" >in
+'
+
+test_expect_success FUNNYNAMES '--batch-check, -z with newline in input' '
+	git cat-file --batch-check -z <in >actual &&
+	echo "$(git rev-parse "HEAD:newline${LF}embedded") blob 0" >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success FUNNYNAMES '--batch-check, -Z with newline in input' '
+	git cat-file --batch-check -Z <in >actual &&
+	printf "%s\0" "$(git rev-parse "HEAD:newline${LF}embedded") blob 0" >expect &&
+	test_cmp expect actual
 '
 
 test_expect_success 'setup blobs which are likely to delta' '
 	test-tool genrandom foo 10240 >foo &&
-	{ cat foo; echo plus; } >foo-plus &&
+	{ cat foo && echo plus; } >foo-plus &&
 	git add foo foo-plus &&
 	git commit -m foo &&
 	cat >blobs <<-\EOF
@@ -305,7 +626,7 @@ test_expect_success 'confirm that neither loose blob is a delta' '
 # we will check only that one of the two objects is a delta
 # against the other, but not the order. We can do so by just
 # asking for the base of both, and checking whether either
-# sha1 appears in the output.
+# oid appears in the output.
 test_expect_success '%(deltabase) reports packed delta bases' '
 	git repack -ad &&
 	git cat-file --batch-check="%(deltabase)" <blobs >actual &&
@@ -315,39 +636,244 @@ test_expect_success '%(deltabase) reports packed delta bases' '
 	}
 '
 
-bogus_type="bogus"
-bogus_content="bogus"
-bogus_size=$(strlen "$bogus_content")
-bogus_sha1=$(echo_without_newline "$bogus_content" | git hash-object -t $bogus_type --literally -w --stdin)
+test_expect_success 'setup bogus data' '
+	bogus_short_type="bogus" &&
+	bogus_short_content="bogus" &&
+	bogus_short_size=$(strlen "$bogus_short_content") &&
+	bogus_short_oid=$(echo_without_newline "$bogus_short_content" | git hash-object -t $bogus_short_type --literally -w --stdin) &&
+
+	bogus_long_type="abcdefghijklmnopqrstuvwxyz1234679" &&
+	bogus_long_content="bogus" &&
+	bogus_long_size=$(strlen "$bogus_long_content") &&
+	bogus_long_oid=$(echo_without_newline "$bogus_long_content" | git hash-object -t $bogus_long_type --literally -w --stdin)
+'
+
+for arg1 in '' --allow-unknown-type
+do
+	for arg2 in -s -t -p
+	do
+		if test "$arg1" = "--allow-unknown-type" && test "$arg2" = "-p"
+		then
+			continue
+		fi
+
+
+		test_expect_success "cat-file $arg1 $arg2 error on bogus short OID" '
+			cat >expect <<-\EOF &&
+			fatal: invalid object type
+			EOF
+
+			if test "$arg1" = "--allow-unknown-type"
+			then
+				git cat-file $arg1 $arg2 $bogus_short_oid
+			else
+				test_must_fail git cat-file $arg1 $arg2 $bogus_short_oid >out 2>actual &&
+				test_must_be_empty out &&
+				test_cmp expect actual
+			fi
+		'
+
+		test_expect_success "cat-file $arg1 $arg2 error on bogus full OID" '
+			if test "$arg2" = "-p"
+			then
+				cat >expect <<-EOF
+				error: header for $bogus_long_oid too long, exceeds 32 bytes
+				fatal: Not a valid object name $bogus_long_oid
+				EOF
+			else
+				cat >expect <<-EOF
+				error: header for $bogus_long_oid too long, exceeds 32 bytes
+				fatal: git cat-file: could not get object info
+				EOF
+			fi &&
+
+			if test "$arg1" = "--allow-unknown-type"
+			then
+				git cat-file $arg1 $arg2 $bogus_short_oid
+			else
+				test_must_fail git cat-file $arg1 $arg2 $bogus_long_oid >out 2>actual &&
+				test_must_be_empty out &&
+				test_cmp expect actual
+			fi
+		'
+
+		test_expect_success "cat-file $arg1 $arg2 error on missing short OID" '
+			cat >expect.err <<-EOF &&
+			fatal: Not a valid object name $(test_oid deadbeef_short)
+			EOF
+			test_must_fail git cat-file $arg1 $arg2 $(test_oid deadbeef_short) >out 2>err.actual &&
+			test_must_be_empty out &&
+			test_cmp expect.err err.actual
+		'
+
+		test_expect_success "cat-file $arg1 $arg2 error on missing full OID" '
+			if test "$arg2" = "-p"
+			then
+				cat >expect.err <<-EOF
+				fatal: Not a valid object name $(test_oid deadbeef)
+				EOF
+			else
+				cat >expect.err <<-\EOF
+				fatal: git cat-file: could not get object info
+				EOF
+			fi &&
+			test_must_fail git cat-file $arg1 $arg2 $(test_oid deadbeef) >out 2>err.actual &&
+			test_must_be_empty out &&
+			test_cmp expect.err err.actual
+		'
+	done
+done
+
+test_expect_success '-e is OK with a broken object without --allow-unknown-type' '
+	git cat-file -e $bogus_short_oid
+'
+
+test_expect_success '-e can not be combined with --allow-unknown-type' '
+	test_expect_code 128 git cat-file -e --allow-unknown-type $bogus_short_oid
+'
+
+test_expect_success '-p cannot print a broken object even with --allow-unknown-type' '
+	test_must_fail git cat-file -p $bogus_short_oid &&
+	test_expect_code 128 git cat-file -p --allow-unknown-type $bogus_short_oid
+'
+
+test_expect_success '<type> <hash> does not work with objects of broken types' '
+	cat >err.expect <<-\EOF &&
+	fatal: invalid object type "bogus"
+	EOF
+	test_must_fail git cat-file $bogus_short_type $bogus_short_oid 2>err.actual &&
+	test_cmp err.expect err.actual
+'
+
+test_expect_success 'broken types combined with --batch and --batch-check' '
+	echo $bogus_short_oid >bogus-oid &&
+
+	cat >err.expect <<-\EOF &&
+	fatal: invalid object type
+	EOF
+
+	test_must_fail git cat-file --batch <bogus-oid 2>err.actual &&
+	test_cmp err.expect err.actual &&
+
+	test_must_fail git cat-file --batch-check <bogus-oid 2>err.actual &&
+	test_cmp err.expect err.actual
+'
+
+test_expect_success 'the --batch and --batch-check options do not combine with --allow-unknown-type' '
+	test_expect_code 128 git cat-file --batch --allow-unknown-type <bogus-oid &&
+	test_expect_code 128 git cat-file --batch-check --allow-unknown-type <bogus-oid
+'
+
+test_expect_success 'the --allow-unknown-type option does not consider replacement refs' '
+	cat >expect <<-EOF &&
+	$bogus_short_type
+	EOF
+	git cat-file -t --allow-unknown-type $bogus_short_oid >actual &&
+	test_cmp expect actual &&
+
+	# Create it manually, as "git replace" will die on bogus
+	# types.
+	head=$(git rev-parse --verify HEAD) &&
+	test_when_finished "test-tool ref-store main delete-refs 0 msg refs/replace/$bogus_short_oid" &&
+	test-tool ref-store main update-ref msg "refs/replace/$bogus_short_oid" $head $ZERO_OID REF_SKIP_OID_VERIFICATION &&
+
+	cat >expect <<-EOF &&
+	commit
+	EOF
+	git cat-file -t --allow-unknown-type $bogus_short_oid >actual &&
+	test_cmp expect actual
+'
 
 test_expect_success "Type of broken object is correct" '
-	echo $bogus_type >expect &&
-	git cat-file -t --allow-unknown-type $bogus_sha1 >actual &&
+	echo $bogus_short_type >expect &&
+	git cat-file -t --allow-unknown-type $bogus_short_oid >actual &&
 	test_cmp expect actual
 '
 
 test_expect_success "Size of broken object is correct" '
-	echo $bogus_size >expect &&
-	git cat-file -s --allow-unknown-type $bogus_sha1 >actual &&
+	echo $bogus_short_size >expect &&
+	git cat-file -s --allow-unknown-type $bogus_short_oid >actual &&
 	test_cmp expect actual
 '
-bogus_type="abcdefghijklmnopqrstuvwxyz1234679"
-bogus_content="bogus"
-bogus_size=$(strlen "$bogus_content")
-bogus_sha1=$(echo_without_newline "$bogus_content" | git hash-object -t $bogus_type --literally -w --stdin)
+
+test_expect_success 'clean up broken object' '
+	rm .git/objects/$(test_oid_to_path $bogus_short_oid)
+'
 
 test_expect_success "Type of broken object is correct when type is large" '
-	echo $bogus_type >expect &&
-	git cat-file -t --allow-unknown-type $bogus_sha1 >actual &&
+	echo $bogus_long_type >expect &&
+	git cat-file -t --allow-unknown-type $bogus_long_oid >actual &&
 	test_cmp expect actual
 '
 
 test_expect_success "Size of large broken object is correct when type is large" '
-	echo $bogus_size >expect &&
-	git cat-file -s --allow-unknown-type $bogus_sha1 >actual &&
+	echo $bogus_long_size >expect &&
+	git cat-file -s --allow-unknown-type $bogus_long_oid >actual &&
 	test_cmp expect actual
 '
 
+test_expect_success 'clean up broken object' '
+	rm .git/objects/$(test_oid_to_path $bogus_long_oid)
+'
+
+test_expect_success 'cat-file -t and -s on corrupt loose object' '
+	git init --bare corrupt-loose.git &&
+	(
+		cd corrupt-loose.git &&
+
+		# Setup and create the empty blob and its path
+		empty_path=$(git rev-parse --git-path objects/$(test_oid_to_path "$EMPTY_BLOB")) &&
+		empty_blob=$(git hash-object -w --stdin </dev/null) &&
+
+		# Create another blob and its path
+		echo other >other.blob &&
+		other_blob=$(git hash-object -w --stdin <other.blob) &&
+		other_path=$(git rev-parse --git-path objects/$(test_oid_to_path "$other_blob")) &&
+
+		# Before the swap the size is 0
+		cat >out.expect <<-EOF &&
+		0
+		EOF
+		git cat-file -s "$EMPTY_BLOB" >out.actual 2>err.actual &&
+		test_must_be_empty err.actual &&
+		test_cmp out.expect out.actual &&
+
+		# Swap the two to corrupt the repository
+		mv -f "$other_path" "$empty_path" &&
+		test_must_fail git fsck 2>err.fsck &&
+		grep "hash-path mismatch" err.fsck &&
+
+		# confirm that cat-file is reading the new swapped-in
+		# blob...
+		cat >out.expect <<-EOF &&
+		blob
+		EOF
+		git cat-file -t "$EMPTY_BLOB" >out.actual 2>err.actual &&
+		test_must_be_empty err.actual &&
+		test_cmp out.expect out.actual &&
+
+		# ... since it has a different size now.
+		cat >out.expect <<-EOF &&
+		6
+		EOF
+		git cat-file -s "$EMPTY_BLOB" >out.actual 2>err.actual &&
+		test_must_be_empty err.actual &&
+		test_cmp out.expect out.actual &&
+
+		# So far "cat-file" has been happy to spew the found
+		# content out as-is. Try to make it zlib-invalid.
+		mv -f other.blob "$empty_path" &&
+		test_must_fail git fsck 2>err.fsck &&
+		cat >expect <<-EOF &&
+		error: inflate: data stream error (incorrect header check)
+		error: unable to unpack header of ./$empty_path
+		error: $empty_blob: object corrupt or missing: ./$empty_path
+		EOF
+		grep "^error: " err.fsck >actual &&
+		test_cmp expect actual
+	)
+'
+
 # Tests for git cat-file --follow-symlinks
 test_expect_success 'prep for symlink tests' '
 	echo_without_newline "$hello_content" >morx &&
@@ -384,7 +910,7 @@ test_expect_success 'prep for symlink tests' '
 	test_ln_s_add loop2 loop1 &&
 	git add morx dir/subdir/ind2 dir/ind1 &&
 	git commit -am "test" &&
-	echo $hello_sha1 blob $hello_size >found
+	echo $hello_oid blob $hello_size >found
 '
 
 test_expect_success 'git cat-file --batch-check --follow-symlinks works for non-links' '
@@ -413,6 +939,13 @@ test_expect_success 'git cat-file --batch-check --follow-symlinks works for brok
 	test_cmp expect actual
 '
 
+test_expect_success 'git cat-file --batch-check --follow-symlinks -Z works for broken in-repo, same-dir links' '
+	printf "HEAD:broken-same-dir-link\0" >in &&
+	printf "dangling 25\0HEAD:broken-same-dir-link\0" >expect &&
+	git cat-file --batch-check --follow-symlinks -Z <in >actual &&
+	test_cmp expect actual
+'
+
 test_expect_success 'git cat-file --batch-check --follow-symlinks works for same-dir links-to-links' '
 	echo HEAD:link-to-link | git cat-file --batch-check --follow-symlinks >actual &&
 	test_cmp found actual
@@ -427,6 +960,15 @@ test_expect_success 'git cat-file --batch-check --follow-symlinks works for pare
 	test_cmp expect actual
 '
 
+test_expect_success 'git cat-file --batch-check --follow-symlinks -Z works for parent-dir links' '
+	echo HEAD:dir/parent-dir-link | git cat-file --batch-check --follow-symlinks >actual &&
+	test_cmp found actual &&
+	printf "notdir 29\0HEAD:dir/parent-dir-link/nope\0" >expect &&
+	printf "HEAD:dir/parent-dir-link/nope\0" >in &&
+	git cat-file --batch-check --follow-symlinks -Z <in >actual &&
+	test_cmp expect actual
+'
+
 test_expect_success 'git cat-file --batch-check --follow-symlinks works for .. links' '
 	echo dangling 22 >expect &&
 	echo HEAD:dir/link-dir/nope >>expect &&
@@ -456,7 +998,7 @@ test_expect_success 'git cat-file --batch-check --follow-symlinks works for dir/
 	echo HEAD:dirlink/morx >>expect &&
 	echo HEAD:dirlink/morx | git cat-file --batch-check --follow-symlinks >actual &&
 	test_cmp expect actual &&
-	echo $hello_sha1 blob $hello_size >expect &&
+	echo $hello_oid blob $hello_size >expect &&
 	echo HEAD:dirlink/ind1 | git cat-file --batch-check --follow-symlinks >actual &&
 	test_cmp expect actual
 '
@@ -541,6 +1083,13 @@ test_expect_success 'git cat-file --batch-check --follow-symlink breaks loops' '
 	test_cmp expect actual
 '
 
+test_expect_success 'git cat-file --batch-check --follow-symlink -Z breaks loops' '
+	printf "loop 10\0HEAD:loop1\0" >expect &&
+	printf "HEAD:loop1\0" >in &&
+	git cat-file --batch-check --follow-symlinks -Z <in >actual &&
+	test_cmp expect actual
+'
+
 test_expect_success 'git cat-file --batch --follow-symlink returns correct sha and mode' '
 	echo HEAD:morx | git cat-file --batch >expect &&
 	echo HEAD:morx | git cat-file --batch --follow-symlinks >actual &&
@@ -586,4 +1135,163 @@ test_expect_success 'cat-file --unordered works' '
 	test_cmp expect actual
 '
 
+test_expect_success 'set up object list for --batch-all-objects tests' '
+	git -C all-two cat-file --batch-all-objects --batch-check="%(objectname)" >objects
+'
+
+test_expect_success 'cat-file --batch="%(objectname)" with --batch-all-objects will work' '
+	git -C all-two cat-file --batch="%(objectname)" <objects >expect &&
+	git -C all-two cat-file --batch-all-objects --batch="%(objectname)" >actual &&
+	cmp expect actual
+'
+
+test_expect_success 'cat-file --batch="%(rest)" with --batch-all-objects will work' '
+	git -C all-two cat-file --batch="%(rest)" <objects >expect &&
+	git -C all-two cat-file --batch-all-objects --batch="%(rest)" >actual &&
+	cmp expect actual
+'
+
+test_expect_success 'cat-file --batch="batman" with --batch-all-objects will work' '
+	git -C all-two cat-file --batch="batman" <objects >expect &&
+	git -C all-two cat-file --batch-all-objects --batch="batman" >actual &&
+	cmp expect actual
+'
+
+test_expect_success 'cat-file %(objectsize:disk) with --batch-all-objects' '
+	# our state has both loose and packed objects,
+	# so find both for our expected output
+	{
+		find .git/objects/?? -type f |
+		awk -F/ "{ print \$0, \$3\$4 }" |
+		while read path oid
+		do
+			size=$(test_file_size "$path") &&
+			echo "$oid $size" ||
+			return 1
+		done &&
+		rawsz=$(test_oid rawsz) &&
+		find .git/objects/pack -name "*.idx" |
+		while read idx
+		do
+			git show-index <"$idx" >idx.raw &&
+			sort -nr <idx.raw >idx.sorted &&
+			packsz=$(test_file_size "${idx%.idx}.pack") &&
+			end=$((packsz - rawsz)) &&
+			while read start oid rest
+			do
+				size=$((end - start)) &&
+				end=$start &&
+				echo "$oid $size" ||
+				return 1
+			done <idx.sorted ||
+			return 1
+		done
+	} >expect.raw &&
+	sort <expect.raw >expect &&
+	git cat-file --batch-all-objects \
+		--batch-check="%(objectname) %(objectsize:disk)" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'set up replacement object' '
+	orig=$(git rev-parse HEAD) &&
+	git cat-file commit $orig >orig &&
+	{
+		cat orig &&
+		echo extra
+	} >fake &&
+	fake=$(git hash-object -t commit -w fake) &&
+	orig_size=$(git cat-file -s $orig) &&
+	fake_size=$(git cat-file -s $fake) &&
+	git replace $orig $fake
+'
+
+test_expect_success 'cat-file --batch respects replace objects' '
+	git cat-file --batch >actual <<-EOF &&
+	$orig
+	EOF
+	{
+		echo "$orig commit $fake_size" &&
+		cat fake &&
+		echo
+	} >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'cat-file --batch-check respects replace objects' '
+	git cat-file --batch-check >actual <<-EOF &&
+	$orig
+	EOF
+	echo "$orig commit $fake_size" >expect &&
+	test_cmp expect actual
+'
+
+# Pull the entry for object with oid "$1" out of the output of
+# "cat-file --batch", including its object content (which requires
+# parsing and reading a set amount of bytes, hence perl).
+extract_batch_output () {
+    perl -ne '
+	BEGIN { $oid = shift }
+	if (/^$oid \S+ (\d+)$/) {
+	    print;
+	    read STDIN, my $buf, $1;
+	    print $buf;
+	    print "\n";
+	}
+    ' "$@"
+}
+
+test_expect_success 'cat-file --batch-all-objects --batch ignores replace' '
+	git cat-file --batch-all-objects --batch >actual.raw &&
+	extract_batch_output $orig <actual.raw >actual &&
+	{
+		echo "$orig commit $orig_size" &&
+		cat orig &&
+		echo
+	} >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'cat-file --batch-all-objects --batch-check ignores replace' '
+	git cat-file --batch-all-objects --batch-check >actual.raw &&
+	grep ^$orig actual.raw >actual &&
+	echo "$orig commit $orig_size" >expect &&
+	test_cmp expect actual
+'
+test_expect_success 'batch-command empty command' '
+	echo "" >cmd &&
+	test_expect_code 128 git cat-file --batch-command <cmd 2>err &&
+	grep "^fatal:.*empty command in input.*" err
+'
+
+test_expect_success 'batch-command whitespace before command' '
+	echo " info deadbeef" >cmd &&
+	test_expect_code 128 git cat-file --batch-command <cmd 2>err &&
+	grep "^fatal:.*whitespace before command.*" err
+'
+
+test_expect_success 'batch-command unknown command' '
+	echo unknown_command >cmd &&
+	test_expect_code 128 git cat-file --batch-command <cmd 2>err &&
+	grep "^fatal:.*unknown command.*" err
+'
+
+test_expect_success 'batch-command missing arguments' '
+	echo "info" >cmd &&
+	test_expect_code 128 git cat-file --batch-command <cmd 2>err &&
+	grep "^fatal:.*info requires arguments.*" err
+'
+
+test_expect_success 'batch-command flush with arguments' '
+	echo "flush arg" >cmd &&
+	test_expect_code 128 git cat-file --batch-command --buffer <cmd 2>err &&
+	grep "^fatal:.*flush takes no arguments.*" err
+'
+
+test_expect_success 'batch-command flush without --buffer' '
+	echo "flush" >cmd &&
+	test_expect_code 128 git cat-file --batch-command <cmd 2>err &&
+	grep "^fatal:.*flush is only for --buffer mode.*" err
+'
+
 test_done
diff --git a/t/t1007-hash-object.sh b/t/t1007-hash-object.sh
index 64b340f..64aea38 100755
--- a/t/t1007-hash-object.sh
+++ b/t/t1007-hash-object.sh
@@ -2,6 +2,7 @@
 
 test_description="git hash-object"
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 echo_without_newline() {
@@ -123,8 +124,8 @@ test_expect_success 'check that appropriate filter is invoke when --path is used
 	path0_sha=$(git hash-object --path=file0 file1) &&
 	test "$file0_sha" = "$path0_sha" &&
 	test "$file1_sha" = "$path1_sha" &&
-	path1_sha=$(cat file0 | git hash-object --path=file1 --stdin) &&
-	path0_sha=$(cat file1 | git hash-object --path=file0 --stdin) &&
+	path1_sha=$(git hash-object --path=file1 --stdin <file0) &&
+	path0_sha=$(git hash-object --path=file0 --stdin <file1) &&
 	test "$file0_sha" = "$path0_sha" &&
 	test "$file1_sha" = "$path1_sha"
 '
@@ -153,7 +154,7 @@ test_expect_success '--path works in a subdirectory' '
 test_expect_success 'check that --no-filters option works' '
 	nofilters_file1=$(git hash-object --no-filters file1) &&
 	test "$file0_sha" = "$nofilters_file1" &&
-	nofilters_file1=$(cat file1 | git hash-object --stdin) &&
+	nofilters_file1=$(git hash-object --stdin <file1) &&
 	test "$file0_sha" = "$nofilters_file1"
 '
 
@@ -202,23 +203,34 @@ done
 test_expect_success 'too-short tree' '
 	echo abc >malformed-tree &&
 	test_must_fail git hash-object -t tree malformed-tree 2>err &&
-	test_i18ngrep "too-short tree object" err
+	grep "too-short tree object" err
 '
 
 test_expect_success 'malformed mode in tree' '
-	hex_sha1=$(echo foo | git hash-object --stdin -w) &&
-	bin_sha1=$(echo $hex_sha1 | hex2oct) &&
-	printf "9100644 \0$bin_sha1" >tree-with-malformed-mode &&
+	hex_oid=$(echo foo | git hash-object --stdin -w) &&
+	bin_oid=$(echo $hex_oid | hex2oct) &&
+	printf "9100644 \0$bin_oid" >tree-with-malformed-mode &&
 	test_must_fail git hash-object -t tree tree-with-malformed-mode 2>err &&
-	test_i18ngrep "malformed mode in tree entry" err
+	grep "malformed mode in tree entry" err
 '
 
 test_expect_success 'empty filename in tree' '
-	hex_sha1=$(echo foo | git hash-object --stdin -w) &&
-	bin_sha1=$(echo $hex_sha1 | hex2oct) &&
-	printf "100644 \0$bin_sha1" >tree-with-empty-filename &&
+	hex_oid=$(echo foo | git hash-object --stdin -w) &&
+	bin_oid=$(echo $hex_oid | hex2oct) &&
+	printf "100644 \0$bin_oid" >tree-with-empty-filename &&
 	test_must_fail git hash-object -t tree tree-with-empty-filename 2>err &&
-	test_i18ngrep "empty filename in tree entry" err
+	grep "empty filename in tree entry" err
+'
+
+test_expect_success 'duplicate filename in tree' '
+	hex_oid=$(echo foo | git hash-object --stdin -w) &&
+	bin_oid=$(echo $hex_oid | hex2oct) &&
+	{
+		printf "100644 file\0$bin_oid" &&
+		printf "100644 file\0$bin_oid"
+	} >tree-with-duplicate-filename &&
+	test_must_fail git hash-object -t tree tree-with-duplicate-filename 2>err &&
+	grep "duplicateEntries" err
 '
 
 test_expect_success 'corrupt commit' '
diff --git a/t/t1008-read-tree-overlay.sh b/t/t1008-read-tree-overlay.sh
index cf96016..ad5936e 100755
--- a/t/t1008-read-tree-overlay.sh
+++ b/t/t1008-read-tree-overlay.sh
@@ -2,6 +2,10 @@
 
 test_description='test multi-tree read-tree without merging'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-read-tree.sh
 
@@ -22,7 +26,7 @@ test_expect_success setup '
 '
 
 test_expect_success 'multi-read' '
-	read_tree_must_succeed initial master side &&
+	read_tree_must_succeed initial main side &&
 	test_write_lines a b/c >expect &&
 	git ls-files >actual &&
 	test_cmp expect actual
diff --git a/t/t1009-read-tree-new-index.sh b/t/t1009-read-tree-new-index.sh
index 59b3aa4..fc179ac 100755
--- a/t/t1009-read-tree-new-index.sh
+++ b/t/t1009-read-tree-new-index.sh
@@ -2,6 +2,10 @@
 
 test_description='test read-tree into a fresh index file'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -12,13 +16,13 @@ test_expect_success setup '
 
 test_expect_success 'non-existent index file' '
 	rm -f new-index &&
-	GIT_INDEX_FILE=new-index git read-tree master
+	GIT_INDEX_FILE=new-index git read-tree main
 '
 
 test_expect_success 'empty index file' '
 	rm -f new-index &&
 	> new-index &&
-	GIT_INDEX_FILE=new-index git read-tree master
+	GIT_INDEX_FILE=new-index git read-tree main
 '
 
 test_done
diff --git a/t/t1010-mktree.sh b/t/t1010-mktree.sh
index b946f87..22875ba 100755
--- a/t/t1010-mktree.sh
+++ b/t/t1010-mktree.sh
@@ -2,13 +2,14 @@
 
 test_description='git mktree'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
-	for d in a a. a0
+	for d in a a- a0
 	do
 		mkdir "$d" && echo "$d/one" >"$d/one" &&
-		git add "$d"
+		git add "$d" || return 1
 	done &&
 	echo zero >one &&
 	git update-index --add --info-only one &&
@@ -59,11 +60,11 @@ test_expect_success 'allow missing object with --missing' '
 '
 
 test_expect_success 'mktree refuses to read ls-tree -r output (1)' '
-	test_must_fail git mktree <all >actual
+	test_must_fail git mktree <all
 '
 
 test_expect_success 'mktree refuses to read ls-tree -r output (2)' '
-	test_must_fail git mktree <all.withsub >actual
+	test_must_fail git mktree <all.withsub
 '
 
 test_done
diff --git a/t/t1011-read-tree-sparse-checkout.sh b/t/t1011-read-tree-sparse-checkout.sh
index 140f459..595b24c 100755
--- a/t/t1011-read-tree-sparse-checkout.sh
+++ b/t/t1011-read-tree-sparse-checkout.sh
@@ -2,7 +2,7 @@
 
 test_description='sparse checkout tests
 
-* (tag: removed, master) removed
+* (tag: removed, main) removed
 | D	sub/added
 * (HEAD, tag: top) modified and added
 | M	init.t
@@ -11,6 +11,8 @@ test_description='sparse checkout tests
   A	init.t
 '
 
+TEST_CREATE_REPO_NO_TEMPLATE=1
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-read-tree.sh
 
@@ -53,12 +55,13 @@ test_expect_success 'read-tree without .git/info/sparse-checkout' '
 '
 
 test_expect_success 'read-tree with .git/info/sparse-checkout but disabled' '
+	mkdir .git/info &&
 	echo >.git/info/sparse-checkout &&
 	read_tree_u_must_succeed -m -u HEAD &&
 	git ls-files -t >result &&
 	test_cmp expected.swt result &&
-	test -f init.t &&
-	test -f sub/added
+	test_path_is_file init.t &&
+	test_path_is_file sub/added
 '
 
 test_expect_success 'read-tree --no-sparse-checkout with empty .git/info/sparse-checkout and enabled' '
@@ -67,8 +70,8 @@ test_expect_success 'read-tree --no-sparse-checkout with empty .git/info/sparse-
 	read_tree_u_must_succeed --no-sparse-checkout -m -u HEAD &&
 	git ls-files -t >result &&
 	test_cmp expected.swt result &&
-	test -f init.t &&
-	test -f sub/added
+	test_path_is_file init.t &&
+	test_path_is_file sub/added
 '
 
 test_expect_success 'read-tree with empty .git/info/sparse-checkout' '
@@ -85,8 +88,8 @@ test_expect_success 'read-tree with empty .git/info/sparse-checkout' '
 	S subsub/added
 	EOF
 	test_cmp expected.swt result &&
-	! test -f init.t &&
-	! test -f sub/added
+	test_path_is_missing init.t &&
+	test_path_is_missing sub/added
 '
 
 test_expect_success 'match directories with trailing slash' '
@@ -101,8 +104,8 @@ test_expect_success 'match directories with trailing slash' '
 	read_tree_u_must_succeed -m -u HEAD &&
 	git ls-files -t > result &&
 	test_cmp expected.swt-noinit result &&
-	test ! -f init.t &&
-	test -f sub/added
+	test_path_is_missing init.t &&
+	test_path_is_file sub/added
 '
 
 test_expect_success 'match directories without trailing slash' '
@@ -110,8 +113,8 @@ test_expect_success 'match directories without trailing slash' '
 	read_tree_u_must_succeed -m -u HEAD &&
 	git ls-files -t >result &&
 	test_cmp expected.swt-noinit result &&
-	test ! -f init.t &&
-	test -f sub/added
+	test_path_is_missing init.t &&
+	test_path_is_file sub/added
 '
 
 test_expect_success 'match directories with negated patterns' '
@@ -129,9 +132,9 @@ EOF
 	git read-tree -m -u HEAD &&
 	git ls-files -t >result &&
 	test_cmp expected.swt-negation result &&
-	test ! -f init.t &&
-	test ! -f sub/added &&
-	test -f sub/addedtoo
+	test_path_is_missing init.t &&
+	test_path_is_missing sub/added &&
+	test_path_is_file sub/addedtoo
 '
 
 test_expect_success 'match directories with negated patterns (2)' '
@@ -150,9 +153,9 @@ EOF
 	git read-tree -m -u HEAD &&
 	git ls-files -t >result &&
 	test_cmp expected.swt-negation2 result &&
-	test -f init.t &&
-	test -f sub/added &&
-	test ! -f sub/addedtoo
+	test_path_is_file init.t &&
+	test_path_is_file sub/added &&
+	test_path_is_missing sub/addedtoo
 '
 
 test_expect_success 'match directory pattern' '
@@ -160,8 +163,8 @@ test_expect_success 'match directory pattern' '
 	read_tree_u_must_succeed -m -u HEAD &&
 	git ls-files -t >result &&
 	test_cmp expected.swt-noinit result &&
-	test ! -f init.t &&
-	test -f sub/added
+	test_path_is_missing init.t &&
+	test_path_is_file sub/added
 '
 
 test_expect_success 'checkout area changes' '
@@ -176,22 +179,43 @@ test_expect_success 'checkout area changes' '
 	read_tree_u_must_succeed -m -u HEAD &&
 	git ls-files -t >result &&
 	test_cmp expected.swt-nosub result &&
-	test -f init.t &&
-	test ! -f sub/added
+	test_path_is_file init.t &&
+	test_path_is_missing sub/added
 '
 
 test_expect_success 'read-tree updates worktree, absent case' '
 	echo sub/added >.git/info/sparse-checkout &&
 	git checkout -f top &&
 	read_tree_u_must_succeed -m -u HEAD^ &&
-	test ! -f init.t
+	test_path_is_missing init.t
+'
+
+test_expect_success 'read-tree will not throw away dirty changes, non-sparse' '
+	echo "/*" >.git/info/sparse-checkout &&
+	read_tree_u_must_succeed -m -u HEAD &&
+
+	echo dirty >init.t &&
+	read_tree_u_must_fail -m -u HEAD^ &&
+	test_path_is_file init.t &&
+	grep -q dirty init.t
+'
+
+test_expect_success 'read-tree will not throw away dirty changes, sparse' '
+	echo "/*" >.git/info/sparse-checkout &&
+	read_tree_u_must_succeed -m -u HEAD &&
+
+	echo dirty >init.t &&
+	echo sub/added >.git/info/sparse-checkout &&
+	read_tree_u_must_fail -m -u HEAD^ &&
+	test_path_is_file init.t &&
+	grep -q dirty init.t
 '
 
 test_expect_success 'read-tree updates worktree, dirty case' '
 	echo sub/added >.git/info/sparse-checkout &&
 	git checkout -f top &&
 	echo dirty >init.t &&
-	read_tree_u_must_succeed -m -u HEAD^ &&
+	read_tree_u_must_fail -m -u HEAD^ &&
 	grep -q dirty init.t &&
 	rm init.t
 '
@@ -208,7 +232,7 @@ test_expect_success 'read-tree adds to worktree, absent case' '
 	echo init.t >.git/info/sparse-checkout &&
 	git checkout -f removed &&
 	read_tree_u_must_succeed -u -m HEAD^ &&
-	test ! -f sub/added
+	test_path_is_missing sub/added
 '
 
 test_expect_success 'read-tree adds to worktree, dirty case' '
@@ -227,7 +251,7 @@ test_expect_success 'index removal and worktree narrowing at the same time' '
 	echo init.t >.git/info/sparse-checkout &&
 	git checkout removed &&
 	git ls-files sub/added >result &&
-	test ! -f sub/added &&
+	test_path_is_missing sub/added &&
 	test_must_be_empty result
 '
 
@@ -253,7 +277,7 @@ warning: The following paths were already present and thus not updated despite s
 
 After fixing the above paths, you may want to run `git sparse-checkout reapply`.
 EOF
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 test_expect_success 'checkout without --ignore-skip-worktree-bits' '
diff --git a/t/t1012-read-tree-df.sh b/t/t1012-read-tree-df.sh
index 57f0770..cde93d2 100755
--- a/t/t1012-read-tree-df.sh
+++ b/t/t1012-read-tree-df.sh
@@ -2,6 +2,7 @@
 
 test_description='read-tree D/F conflict corner cases'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-read-tree.sh
 
diff --git a/t/t1013-read-tree-submodule.sh b/t/t1013-read-tree-submodule.sh
index b6df744..bfc90d4 100755
--- a/t/t1013-read-tree-submodule.sh
+++ b/t/t1013-read-tree-submodule.sh
@@ -6,7 +6,6 @@ test_description='read-tree can handle submodules'
 . "$TEST_DIRECTORY"/lib-submodule-update.sh
 
 KNOWN_FAILURE_DIRECTORY_SUBMODULE_CONFLICTS=1
-KNOWN_FAILURE_SUBMODULE_OVERWRITE_IGNORED_UNTRACKED=1
 
 test_submodule_switch_recursing_with_args "read-tree -u -m"
 
diff --git a/t/t1014-read-tree-confusing.sh b/t/t1014-read-tree-confusing.sh
index da3376b..8ea8d36 100755
--- a/t/t1014-read-tree-confusing.sh
+++ b/t/t1014-read-tree-confusing.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='check that read-tree rejects confusing paths'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'create base tree' '
diff --git a/t/t1016-compatObjectFormat.sh b/t/t1016-compatObjectFormat.sh
new file mode 100755
index 0000000..be3206a
--- /dev/null
+++ b/t/t1016-compatObjectFormat.sh
@@ -0,0 +1,281 @@
+#!/bin/sh
+#
+# Copyright (c) 2023 Eric Biederman
+#
+
+test_description='Test how well compatObjectFormat works'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-gpg.sh
+
+# All of the follow variables must be defined in the environment:
+# GIT_AUTHOR_NAME
+# GIT_AUTHOR_EMAIL
+# GIT_AUTHOR_DATE
+# GIT_COMMITTER_NAME
+# GIT_COMMITTER_EMAIL
+# GIT_COMMITTER_DATE
+#
+# The test relies on these variables being set so that the two
+# different commits in two different repositories encoded with two
+# different hash functions result in the same content in the commits.
+# This means that when the commit is translated between hash functions
+# the commit is identical to the commit in the other repository.
+
+compat_hash () {
+    case "$1" in
+    "sha1")
+	echo "sha256"
+	;;
+    "sha256")
+	echo "sha1"
+	;;
+    esac
+}
+
+hello_oid () {
+    case "$1" in
+    "sha1")
+	echo "$hello_sha1_oid"
+	;;
+    "sha256")
+	echo "$hello_sha256_oid"
+	;;
+    esac
+}
+
+tree_oid () {
+    case "$1" in
+    "sha1")
+	echo "$tree_sha1_oid"
+	;;
+    "sha256")
+	echo "$tree_sha256_oid"
+	;;
+    esac
+}
+
+commit_oid () {
+    case "$1" in
+    "sha1")
+	echo "$commit_sha1_oid"
+	;;
+    "sha256")
+	echo "$commit_sha256_oid"
+	;;
+    esac
+}
+
+commit2_oid () {
+    case "$1" in
+    "sha1")
+	echo "$commit2_sha1_oid"
+	;;
+    "sha256")
+	echo "$commit2_sha256_oid"
+	;;
+    esac
+}
+
+del_sigcommit () {
+    local delete="$1"
+
+    if test "$delete" = "sha256" ; then
+	local pattern="gpgsig-sha256"
+    else
+	local pattern="gpgsig"
+    fi
+    test-tool delete-gpgsig "$pattern"
+}
+
+
+del_sigtag () {
+    local storage="$1"
+    local delete="$2"
+
+    if test "$storage" = "$delete" ; then
+	local pattern="trailer"
+    elif test "$storage" = "sha256" ; then
+	local pattern="gpgsig"
+    else
+	local pattern="gpgsig-sha256"
+    fi
+    test-tool delete-gpgsig "$pattern"
+}
+
+base=$(pwd)
+for hash in sha1 sha256
+do
+	cd "$base"
+	mkdir -p repo-$hash
+	cd repo-$hash
+
+	test_expect_success "setup $hash repository" '
+		git init --object-format=$hash &&
+		git config core.repositoryformatversion 1 &&
+		git config extensions.objectformat $hash &&
+		git config extensions.compatobjectformat $(compat_hash $hash) &&
+		git config gpg.program $TEST_DIRECTORY/t1016/gpg &&
+		echo "Hellow World!" > hello &&
+		eval hello_${hash}_oid=$(git hash-object hello) &&
+		git update-index --add hello &&
+		git commit -m "Initial commit" &&
+		eval commit_${hash}_oid=$(git rev-parse HEAD) &&
+		eval tree_${hash}_oid=$(git rev-parse HEAD^{tree})
+	'
+	test_expect_success "create a $hash  tagged blob" '
+		git tag --no-sign -m "This is a tag" hellotag $(hello_oid $hash) &&
+		eval hellotag_${hash}_oid=$(git rev-parse hellotag)
+	'
+	test_expect_success "create a $hash tagged tree" '
+		git tag --no-sign -m "This is a tag" treetag $(tree_oid $hash) &&
+		eval treetag_${hash}_oid=$(git rev-parse treetag)
+	'
+	test_expect_success "create a $hash tagged commit" '
+		git tag --no-sign -m "This is a tag" committag $(commit_oid $hash) &&
+		eval committag_${hash}_oid=$(git rev-parse committag)
+	'
+	test_expect_success GPG2 "create a $hash signed commit" '
+		git commit --gpg-sign --allow-empty -m "This is a signed commit" &&
+		eval signedcommit_${hash}_oid=$(git rev-parse HEAD)
+	'
+	test_expect_success GPG2 "create a $hash signed tag" '
+		git tag -s -m "This is a signed tag" signedtag HEAD &&
+		eval signedtag_${hash}_oid=$(git rev-parse signedtag)
+	'
+	test_expect_success "create a $hash branch" '
+		git checkout -b branch $(commit_oid $hash) &&
+		echo "More more more give me more!" > more &&
+		eval more_${hash}_oid=$(git hash-object more) &&
+		echo "Another and another and another" > another &&
+		eval another_${hash}_oid=$(git hash-object another) &&
+		git update-index --add more another &&
+		git commit -m "Add more files!" &&
+		eval commit2_${hash}_oid=$(git rev-parse HEAD) &&
+		eval tree2_${hash}_oid=$(git rev-parse HEAD^{tree})
+	'
+	test_expect_success GPG2 "create another $hash signed tag" '
+		git tag -s -m "This is another signed tag" signedtag2 $(commit2_oid $hash) &&
+		eval signedtag2_${hash}_oid=$(git rev-parse signedtag2)
+	'
+	test_expect_success GPG2 "merge the $hash branches together" '
+		git merge -S -m "merge some signed tags together" signedtag signedtag2 &&
+		eval signedcommit2_${hash}_oid=$(git rev-parse HEAD)
+	'
+	test_expect_success GPG2 "create additional $hash signed commits" '
+		git commit --gpg-sign --allow-empty -m "This is an additional signed commit" &&
+		git cat-file commit HEAD | del_sigcommit sha256 > "../${hash}_signedcommit3" &&
+		git cat-file commit HEAD | del_sigcommit sha1 > "../${hash}_signedcommit4" &&
+		eval signedcommit3_${hash}_oid=$(git hash-object -t commit -w ../${hash}_signedcommit3) &&
+		eval signedcommit4_${hash}_oid=$(git hash-object -t commit -w ../${hash}_signedcommit4)
+	'
+	test_expect_success GPG2 "create additional $hash signed tags" '
+		git tag -s -m "This is an additional signed tag" signedtag34 HEAD &&
+		git cat-file tag signedtag34 | del_sigtag "${hash}" sha256 > ../${hash}_signedtag3 &&
+		git cat-file tag signedtag34 | del_sigtag "${hash}" sha1 > ../${hash}_signedtag4 &&
+		eval signedtag3_${hash}_oid=$(git hash-object -t tag -w ../${hash}_signedtag3) &&
+		eval signedtag4_${hash}_oid=$(git hash-object -t tag -w ../${hash}_signedtag4)
+	'
+done
+cd "$base"
+
+compare_oids () {
+    test "$#" = 5 && { local PREREQ="$1"; shift; } || PREREQ=
+    local type="$1"
+    local name="$2"
+    local sha1_oid="$3"
+    local sha256_oid="$4"
+
+    echo ${sha1_oid} > ${name}_sha1_expected
+    echo ${sha256_oid} > ${name}_sha256_expected
+    echo ${type} > ${name}_type_expected
+
+    git --git-dir=repo-sha1/.git rev-parse --output-object-format=sha256 ${sha1_oid} > ${name}_sha1_sha256_found
+    git --git-dir=repo-sha256/.git rev-parse --output-object-format=sha1 ${sha256_oid} > ${name}_sha256_sha1_found
+    local sha1_sha256_oid="$(cat ${name}_sha1_sha256_found)"
+    local sha256_sha1_oid="$(cat ${name}_sha256_sha1_found)"
+
+    test_expect_success $PREREQ "Verify ${type} ${name}'s sha1 oid" '
+	git --git-dir=repo-sha256/.git rev-parse --output-object-format=sha1 ${sha256_oid} > ${name}_sha1 &&
+	test_cmp ${name}_sha1 ${name}_sha1_expected
+'
+
+    test_expect_success $PREREQ "Verify ${type} ${name}'s sha256 oid" '
+	git --git-dir=repo-sha1/.git rev-parse --output-object-format=sha256 ${sha1_oid} > ${name}_sha256 &&
+	test_cmp ${name}_sha256 ${name}_sha256_expected
+'
+
+    test_expect_success $PREREQ "Verify ${name}'s sha1 type" '
+	git --git-dir=repo-sha1/.git cat-file -t ${sha1_oid} > ${name}_type1 &&
+	git --git-dir=repo-sha256/.git cat-file -t ${sha256_sha1_oid} > ${name}_type2 &&
+	test_cmp ${name}_type1 ${name}_type2 &&
+	test_cmp ${name}_type1 ${name}_type_expected
+'
+
+    test_expect_success $PREREQ "Verify ${name}'s sha256 type" '
+	git --git-dir=repo-sha256/.git cat-file -t ${sha256_oid} > ${name}_type3 &&
+	git --git-dir=repo-sha1/.git cat-file -t ${sha1_sha256_oid} > ${name}_type4 &&
+	test_cmp ${name}_type3 ${name}_type4 &&
+	test_cmp ${name}_type3 ${name}_type_expected
+'
+
+    test_expect_success $PREREQ "Verify ${name}'s sha1 size" '
+	git --git-dir=repo-sha1/.git cat-file -s ${sha1_oid} > ${name}_size1 &&
+	git --git-dir=repo-sha256/.git cat-file -s ${sha256_sha1_oid} > ${name}_size2 &&
+	test_cmp ${name}_size1 ${name}_size2
+'
+
+    test_expect_success $PREREQ "Verify ${name}'s sha256 size" '
+	git --git-dir=repo-sha256/.git cat-file -s ${sha256_oid} > ${name}_size3 &&
+	git --git-dir=repo-sha1/.git cat-file -s ${sha1_sha256_oid} > ${name}_size4 &&
+	test_cmp ${name}_size3 ${name}_size4
+'
+
+    test_expect_success $PREREQ "Verify ${name}'s sha1 pretty content" '
+	git --git-dir=repo-sha1/.git cat-file -p ${sha1_oid} > ${name}_content1 &&
+	git --git-dir=repo-sha256/.git cat-file -p ${sha256_sha1_oid} > ${name}_content2 &&
+	test_cmp ${name}_content1 ${name}_content2
+'
+
+    test_expect_success $PREREQ "Verify ${name}'s sha256 pretty content" '
+	git --git-dir=repo-sha256/.git cat-file -p ${sha256_oid} > ${name}_content3 &&
+	git --git-dir=repo-sha1/.git cat-file -p ${sha1_sha256_oid} > ${name}_content4 &&
+	test_cmp ${name}_content3 ${name}_content4
+'
+
+    test_expect_success $PREREQ "Verify ${name}'s sha1 content" '
+	git --git-dir=repo-sha1/.git cat-file ${type} ${sha1_oid} > ${name}_content5 &&
+	git --git-dir=repo-sha256/.git cat-file ${type} ${sha256_sha1_oid} > ${name}_content6 &&
+	test_cmp ${name}_content5 ${name}_content6
+'
+
+    test_expect_success $PREREQ "Verify ${name}'s sha256 content" '
+	git --git-dir=repo-sha256/.git cat-file ${type} ${sha256_oid} > ${name}_content7 &&
+	git --git-dir=repo-sha1/.git cat-file ${type} ${sha1_sha256_oid} > ${name}_content8 &&
+	test_cmp ${name}_content7 ${name}_content8
+'
+
+}
+
+compare_oids 'blob' hello "$hello_sha1_oid" "$hello_sha256_oid"
+compare_oids 'tree' tree "$tree_sha1_oid" "$tree_sha256_oid"
+compare_oids 'commit' commit "$commit_sha1_oid" "$commit_sha256_oid"
+compare_oids GPG2 'commit' signedcommit "$signedcommit_sha1_oid" "$signedcommit_sha256_oid"
+compare_oids 'tag' hellotag "$hellotag_sha1_oid" "$hellotag_sha256_oid"
+compare_oids 'tag' treetag "$treetag_sha1_oid" "$treetag_sha256_oid"
+compare_oids 'tag' committag "$committag_sha1_oid" "$committag_sha256_oid"
+compare_oids GPG2 'tag' signedtag "$signedtag_sha1_oid" "$signedtag_sha256_oid"
+
+compare_oids 'blob' more "$more_sha1_oid" "$more_sha256_oid"
+compare_oids 'blob' another "$another_sha1_oid" "$another_sha256_oid"
+compare_oids 'tree' tree2 "$tree2_sha1_oid" "$tree2_sha256_oid"
+compare_oids 'commit' commit2 "$commit2_sha1_oid" "$commit2_sha256_oid"
+compare_oids GPG2 'tag' signedtag2 "$signedtag2_sha1_oid" "$signedtag2_sha256_oid"
+compare_oids GPG2 'commit' signedcommit2 "$signedcommit2_sha1_oid" "$signedcommit2_sha256_oid"
+compare_oids GPG2 'commit' signedcommit3 "$signedcommit3_sha1_oid" "$signedcommit3_sha256_oid"
+compare_oids GPG2 'commit' signedcommit4 "$signedcommit4_sha1_oid" "$signedcommit4_sha256_oid"
+compare_oids GPG2 'tag' signedtag3 "$signedtag3_sha1_oid" "$signedtag3_sha256_oid"
+compare_oids GPG2 'tag' signedtag4 "$signedtag4_sha1_oid" "$signedtag4_sha256_oid"
+
+test_done
diff --git a/t/t1016/gpg b/t/t1016/gpg
new file mode 100755
index 0000000..2601cb1
--- /dev/null
+++ b/t/t1016/gpg
@@ -0,0 +1,2 @@
+#!/bin/sh
+exec gpg --faked-system-time "20230918T154812" "$@"
diff --git a/t/t1020-subdirectory.sh b/t/t1020-subdirectory.sh
index c2df75e..45eef94 100755
--- a/t/t1020-subdirectory.sh
+++ b/t/t1020-subdirectory.sh
@@ -6,14 +6,15 @@
 test_description='Try various core-level commands in subdirectory.
 '
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-read-tree.sh
 
 test_expect_success setup '
 	long="a b c d e f g h i j k l m n o p q r s t u v w x y z" &&
-	for c in $long; do echo $c; done >one &&
+	test_write_lines $long >one &&
 	mkdir dir &&
-	for c in x y z $long a b c; do echo $c; done >dir/two &&
+	test_write_lines x y z $long a b c >dir/two &&
 	cp one original.one &&
 	cp dir/two original.two
 '
@@ -22,7 +23,7 @@ test_expect_success 'update-index and ls-files' '
 	git update-index --add one &&
 	case "$(git ls-files)" in
 	one) echo pass one ;;
-	*) echo bad one; exit 1 ;;
+	*) echo bad one; return 1 ;;
 	esac &&
 	(
 		cd dir &&
@@ -34,7 +35,7 @@ test_expect_success 'update-index and ls-files' '
 	) &&
 	case "$(git ls-files)" in
 	dir/two"$LF"one) echo pass both ;;
-	*) echo bad; exit 1 ;;
+	*) echo bad; return 1 ;;
 	esac
 '
 
@@ -57,7 +58,7 @@ test_expect_success 'diff-files' '
 	echo d >>dir/two &&
 	case "$(git diff-files --name-only)" in
 	dir/two"$LF"one) echo pass top ;;
-	*) echo bad top; exit 1 ;;
+	*) echo bad top; return 1 ;;
 	esac &&
 	# diff should not omit leading paths
 	(
diff --git a/t/t1021-rerere-in-workdir.sh b/t/t1021-rerere-in-workdir.sh
index 301e071..0b89289 100755
--- a/t/t1021-rerere-in-workdir.sh
+++ b/t/t1021-rerere-in-workdir.sh
@@ -1,6 +1,9 @@
 #!/bin/sh
 
 test_description='rerere run in a workdir'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 test_expect_success SYMLINKS setup '
@@ -19,7 +22,7 @@ test_expect_success SYMLINKS setup '
 	test_tick &&
 	git commit -a -m goodbye &&
 
-	git checkout master
+	git checkout main
 '
 
 test_expect_success SYMLINKS 'rerere in workdir' '
diff --git a/t/t1022-read-tree-partial-clone.sh b/t/t1022-read-tree-partial-clone.sh
new file mode 100755
index 0000000..cca4380
--- /dev/null
+++ b/t/t1022-read-tree-partial-clone.sh
@@ -0,0 +1,30 @@
+#!/bin/sh
+
+test_description='git read-tree in partial clones'
+
+TEST_NO_CREATE_REPO=1
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+test_expect_success 'read-tree in partial clone prefetches in one batch' '
+	test_when_finished "rm -rf server client trace" &&
+
+	git init server &&
+	echo foo >server/one &&
+	echo bar >server/two &&
+	git -C server add one two &&
+	git -C server commit -m "initial commit" &&
+	TREE=$(git -C server rev-parse HEAD^{tree}) &&
+
+	git -C server config uploadpack.allowfilter 1 &&
+	git -C server config uploadpack.allowanysha1inwant 1 &&
+	git clone --bare --filter=blob:none "file://$(pwd)/server" client &&
+	GIT_TRACE_PACKET="$(pwd)/trace" git -C client read-tree $TREE $TREE &&
+
+	# "done" marks the end of negotiation (once per fetch). Expect that
+	# only one fetch occurs.
+	grep "fetch> done" trace >donelines &&
+	test_line_count = 1 donelines
+'
+
+test_done
diff --git a/t/t1050-large.sh b/t/t1050-large.sh
index 61e89a8..c71932b 100755
--- a/t/t1050-large.sh
+++ b/t/t1050-large.sh
@@ -5,11 +5,11 @@ test_description='adding and checking out large blobs'
 
 . ./test-lib.sh
 
-# This should be moved to test-lib.sh together with the
-# copy in t0021 after both topics have graduated to 'master'.
-file_size () {
-	test-tool path-utils file-size "$1"
-}
+test_expect_success 'core.bigFileThreshold must be non-negative' '
+	test_must_fail git -c core.bigFileThreshold=-1 rev-parse >out 2>err &&
+	grep "bad numeric config value" err &&
+	test_must_be_empty out
+'
 
 test_expect_success setup '
 	# clone does not allow us to pass core.bigfilethreshold to
@@ -23,13 +23,21 @@ test_expect_success setup '
 	export GIT_ALLOC_LIMIT
 '
 
+test_expect_success 'enter "large" codepath, with small core.bigFileThreshold' '
+	test_when_finished "rm -rf repo" &&
+
+	git init --bare repo &&
+	echo large | git -C repo hash-object -w --stdin &&
+	git -C repo -c core.bigfilethreshold=4 fsck
+'
+
 # add a large file with different settings
 while read expect config
 do
 	test_expect_success "add with $config" '
 		test_when_finished "rm -f .git/objects/pack/pack-*.* .git/index" &&
 		git $config add large1 &&
-		sz=$(file_size .git/objects/pack/pack-*.pack) &&
+		sz=$(test_file_size .git/objects/pack/pack-*.pack) &&
 		case "$expect" in
 		small) test "$sz" -le 100000 ;;
 		large) test "$sz" -ge 100000 ;;
@@ -49,42 +57,32 @@ EOF
 test_expect_success 'add a large file or two' '
 	git add large1 huge large2 &&
 	# make sure we got a single packfile and no loose objects
-	bad= count=0 idx= &&
+	count=0 idx= &&
 	for p in .git/objects/pack/pack-*.pack
 	do
-		count=$(( $count + 1 ))
-		if test_path_is_file "$p" &&
-		   idx=${p%.pack}.idx && test_path_is_file "$idx"
-		then
-			continue
-		fi
-		bad=t
+		count=$(( $count + 1 )) &&
+		test_path_is_file "$p" &&
+		idx=${p%.pack}.idx &&
+		test_path_is_file "$idx" || return 1
 	done &&
-	test -z "$bad" &&
 	test $count = 1 &&
 	cnt=$(git show-index <"$idx" | wc -l) &&
 	test $cnt = 2 &&
 	for l in .git/objects/$OIDPATH_REGEX
 	do
-		test_path_is_file "$l" || continue
-		bad=t
+		test_path_is_missing "$l" || return 1
 	done &&
-	test -z "$bad" &&
 
 	# attempt to add another copy of the same
 	git add large3 &&
 	bad= count=0 &&
 	for p in .git/objects/pack/pack-*.pack
 	do
-		count=$(( $count + 1 ))
-		if test_path_is_file "$p" &&
-		   idx=${p%.pack}.idx && test_path_is_file "$idx"
-		then
-			continue
-		fi
-		bad=t
+		count=$(( $count + 1 )) &&
+		test_path_is_file "$p" &&
+		idx=${p%.pack}.idx &&
+		test_path_is_file "$idx" || return 1
 	done &&
-	test -z "$bad" &&
 	test $count = 1
 '
 
@@ -113,7 +111,7 @@ test_expect_success 'packsize limit' '
 		count=0 &&
 		for pi in .git/objects/pack/pack-*.idx
 		do
-			test_path_is_file "$pi" && count=$(( $count + 1 ))
+			test_path_is_file "$pi" && count=$(( $count + 1 )) || return 1
 		done &&
 		test $count = 2 &&
 
@@ -126,7 +124,7 @@ test_expect_success 'packsize limit' '
 
 		for pi in .git/objects/pack/pack-*.idx
 		do
-			git show-index <"$pi"
+			git show-index <"$pi" || return 1
 		done |
 		sed -e "s/^[0-9]* \([0-9a-f]*\) .*/\1/" |
 		sort >actual &&
diff --git a/t/t1051-large-conversion.sh b/t/t1051-large-conversion.sh
index 8b7640b..f6709c9 100755
--- a/t/t1051-large-conversion.sh
+++ b/t/t1051-large-conversion.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='test conversion filters on large files'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 set_attr() {
@@ -83,4 +85,30 @@ test_expect_success 'ident converts on output' '
 	test_cmp small.clean large.clean
 '
 
+# This smudge filter prepends 5GB of zeros to the file it checks out. This
+# ensures that smudging doesn't mangle large files on 64-bit Windows.
+test_expect_success EXPENSIVE,SIZE_T_IS_64BIT,!LONG_IS_64BIT \
+		'files over 4GB convert on output' '
+	test_commit test small "a small file" &&
+	small_size=$(test_file_size small) &&
+	test_config filter.makelarge.smudge \
+		"test-tool genzeros $((5*1024*1024*1024)) && cat" &&
+	echo "small filter=makelarge" >.gitattributes &&
+	rm small &&
+	git checkout -- small &&
+	size=$(test_file_size small) &&
+	test "$size" -eq $((5 * 1024 * 1024 * 1024 + $small_size))
+'
+
+# This clean filter writes down the size of input it receives. By checking against
+# the actual size, we ensure that cleaning doesn't mangle large files on 64-bit Windows.
+test_expect_success EXPENSIVE,SIZE_T_IS_64BIT,!LONG_IS_64BIT \
+		'files over 4GB convert on input' '
+	test-tool genzeros $((5*1024*1024*1024)) >big &&
+	test_config filter.checklarge.clean "wc -c >big.size" &&
+	echo "big filter=checklarge" >.gitattributes &&
+	git add big &&
+	test $(test_file_size big) -eq $(cat big.size)
+'
+
 test_done
diff --git a/t/t1060-object-corruption.sh b/t/t1060-object-corruption.sh
index bc89371..5e0f0a3 100755
--- a/t/t1060-object-corruption.sh
+++ b/t/t1060-object-corruption.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='see how we handle various forms of corruption'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # convert "1234abcd" to ".git/objects/12/34abcd"
@@ -123,7 +125,7 @@ test_expect_success 'fetch into corrupted repo with index-pack' '
 		cd bit-error-cp &&
 		test_must_fail git -c transfer.unpackLimit=1 \
 			fetch ../no-bit-error 2>stderr &&
-		test_i18ngrep ! -i collision stderr
+		test_grep ! -i collision stderr
 	)
 '
 
@@ -137,4 +139,11 @@ test_expect_success 'internal tree objects are not "missing"' '
 	)
 '
 
+test_expect_success 'partial clone of corrupted repository' '
+	test_config -C misnamed uploadpack.allowFilter true &&
+	git clone --no-local --no-checkout --filter=blob:none \
+		misnamed corrupt-partial && \
+	test_must_fail git -C corrupt-partial checkout --force
+'
+
 test_done
diff --git a/t/t1090-sparse-checkout-scope.sh b/t/t1090-sparse-checkout-scope.sh
index f35a73d..3a14218 100755
--- a/t/t1090-sparse-checkout-scope.sh
+++ b/t/t1090-sparse-checkout-scope.sh
@@ -2,6 +2,10 @@
 
 test_description='sparse checkout scope tests'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_CREATE_REPO_NO_TEMPLATE=1
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -20,18 +24,19 @@ test_expect_success 'create feature branch' '
 	git commit -m "modification"
 '
 
-test_expect_success 'perform sparse checkout of master' '
+test_expect_success 'perform sparse checkout of main' '
 	git config --local --bool core.sparsecheckout true &&
+	mkdir .git/info &&
 	echo "!/*" >.git/info/sparse-checkout &&
 	echo "/a" >>.git/info/sparse-checkout &&
 	echo "/c" >>.git/info/sparse-checkout &&
-	git checkout master &&
+	git checkout main &&
 	test_path_is_file a &&
 	test_path_is_missing b &&
 	test_path_is_file c
 '
 
-test_expect_success 'merge feature branch into sparse checkout of master' '
+test_expect_success 'merge feature branch into sparse checkout of main' '
 	git merge feature &&
 	test_path_is_file a &&
 	test_path_is_missing b &&
@@ -39,19 +44,38 @@ test_expect_success 'merge feature branch into sparse checkout of master' '
 	test "$(cat c)" = "modified"
 '
 
-test_expect_success 'return to full checkout of master' '
+test_expect_success 'return to full checkout of main' '
 	git checkout feature &&
 	echo "/*" >.git/info/sparse-checkout &&
-	git checkout master &&
+	git checkout main &&
 	test_path_is_file a &&
 	test_path_is_file b &&
 	test_path_is_file c &&
 	test "$(cat b)" = "modified"
 '
 
+test_expect_success 'skip-worktree on files outside sparse patterns' '
+	git sparse-checkout disable &&
+	git sparse-checkout set --no-cone "a*" &&
+	git checkout-index --all --ignore-skip-worktree-bits &&
+
+	git ls-files -t >output &&
+	! grep ^S output >actual &&
+	test_must_be_empty actual &&
+
+	test_config sparse.expectFilesOutsideOfPatterns true &&
+	cat <<-\EOF >expect &&
+	S b
+	S c
+	EOF
+	git ls-files -t >output &&
+	grep ^S output >actual &&
+	test_cmp expect actual
+'
+
 test_expect_success 'in partial clone, sparse checkout only fetches needed blobs' '
 	test_create_repo server &&
-	git clone "file://$(pwd)/server" client &&
+	git clone --template= "file://$(pwd)/server" client &&
 
 	test_config -C server uploadpack.allowfilter 1 &&
 	test_config -C server uploadpack.allowanysha1inwant 1 &&
@@ -63,6 +87,7 @@ test_expect_success 'in partial clone, sparse checkout only fetches needed blobs
 	git -C server commit -m message &&
 
 	test_config -C client core.sparsecheckout 1 &&
+	mkdir client/.git/info &&
 	echo "!/*" >client/.git/info/sparse-checkout &&
 	echo "/a" >>client/.git/info/sparse-checkout &&
 	git -C client fetch --filter=blob:none origin &&
diff --git a/t/t1091-sparse-checkout-builtin.sh b/t/t1091-sparse-checkout-builtin.sh
index 84acfc4..ab3a105 100755
--- a/t/t1091-sparse-checkout-builtin.sh
+++ b/t/t1091-sparse-checkout-builtin.sh
@@ -2,6 +2,12 @@
 
 test_description='sparse checkout builtin tests'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+GIT_TEST_SPLIT_INDEX=false
+export GIT_TEST_SPLIT_INDEX
+
 . ./test-lib.sh
 
 list_files() {
@@ -38,10 +44,18 @@ test_expect_success 'setup' '
 	)
 '
 
-test_expect_success 'git sparse-checkout list (empty)' '
+test_expect_success 'git sparse-checkout list (not sparse)' '
+	test_must_fail git -C repo sparse-checkout list >list 2>err &&
+	test_must_be_empty list &&
+	test_grep "this worktree is not sparse" err
+'
+
+test_expect_success 'git sparse-checkout list (not sparse)' '
+	git -C repo sparse-checkout set &&
+	rm repo/.git/info/sparse-checkout &&
 	git -C repo sparse-checkout list >list 2>err &&
 	test_must_be_empty list &&
-	test_i18ngrep "this worktree is not sparse (sparse-checkout file may not exist)" err
+	test_grep "this worktree is not sparse (sparse-checkout file may not exist)" err
 '
 
 test_expect_success 'git sparse-checkout list (populated)' '
@@ -58,7 +72,7 @@ test_expect_success 'git sparse-checkout list (populated)' '
 '
 
 test_expect_success 'git sparse-checkout init' '
-	git -C repo sparse-checkout init &&
+	git -C repo sparse-checkout init --no-cone &&
 	cat >expect <<-\EOF &&
 	/*
 	!/*/
@@ -68,6 +82,12 @@ test_expect_success 'git sparse-checkout init' '
 	check_files repo a
 '
 
+test_expect_success 'git sparse-checkout init in empty repo' '
+	test_when_finished rm -rf empty-repo blank-template &&
+	git init --template= empty-repo &&
+	git -C empty-repo sparse-checkout init
+'
+
 test_expect_success 'git sparse-checkout list after init' '
 	git -C repo sparse-checkout list >actual &&
 	cat >expect <<-\EOF &&
@@ -91,6 +111,7 @@ test_expect_success 'init with existing sparse-checkout' '
 
 test_expect_success 'clone --sparse' '
 	git clone --sparse "file://$(pwd)/repo" clone &&
+	git -C clone sparse-checkout reapply --no-cone &&
 	git -C clone sparse-checkout list >actual &&
 	cat >expect <<-\EOF &&
 	/*
@@ -100,6 +121,18 @@ test_expect_success 'clone --sparse' '
 	check_files clone a
 '
 
+test_expect_success 'switching to cone mode with non-cone mode patterns' '
+	git init bad-patterns &&
+	(
+		cd bad-patterns &&
+		git sparse-checkout init --no-cone &&
+		git sparse-checkout add dir &&
+		git config --worktree core.sparseCheckoutCone true &&
+		test_must_fail git sparse-checkout add dir 2>err &&
+		grep "existing sparse-checkout patterns do not use cone mode" err
+	)
+'
+
 test_expect_success 'interaction with clone --no-checkout (unborn index)' '
 	git clone --no-checkout "file://$(pwd)/repo" clone_no_checkout &&
 	git -C clone_no_checkout sparse-checkout init --cone &&
@@ -117,15 +150,15 @@ test_expect_success 'interaction with clone --no-checkout (unborn index)' '
 	test_path_is_missing clone_no_checkout/.git/index &&
 
 	# No branch is checked out until we manually switch to one
-	git -C clone_no_checkout switch master &&
+	git -C clone_no_checkout switch main &&
 	test_path_is_file clone_no_checkout/.git/index &&
 	check_files clone_no_checkout a folder1
 '
 
 test_expect_success 'set enables config' '
-	git init empty-config &&
+	git init worktree-config &&
 	(
-		cd empty-config &&
+		cd worktree-config &&
 		test_commit test file &&
 		test_path_is_missing .git/config.worktree &&
 		git sparse-checkout set nothing &&
@@ -162,12 +195,14 @@ test_expect_success 'set sparse-checkout using --stdin' '
 '
 
 test_expect_success 'add to sparse-checkout' '
-	cat repo/.git/info/sparse-checkout >expect &&
+	cat repo/.git/info/sparse-checkout >old &&
+	test_when_finished cp old repo/.git/info/sparse-checkout &&
 	cat >add <<-\EOF &&
 	pattern1
 	/folder1/
 	pattern2
 	EOF
+	cat old >expect &&
 	cat add >>expect &&
 	git -C repo sparse-checkout add --stdin <add &&
 	git -C repo sparse-checkout list >actual &&
@@ -176,11 +211,26 @@ test_expect_success 'add to sparse-checkout' '
 	check_files repo "a folder1 folder2"
 '
 
+test_expect_success 'worktree: add copies sparse-checkout patterns' '
+	cat repo/.git/info/sparse-checkout >old &&
+	test_when_finished cp old repo/.git/info/sparse-checkout &&
+	test_when_finished git -C repo worktree remove ../worktree &&
+	git -C repo sparse-checkout set --no-cone "/*" &&
+	git -C repo worktree add --quiet ../worktree 2>err &&
+	test_must_be_empty err &&
+	new="$(git -C worktree rev-parse --git-path info/sparse-checkout)" &&
+	test_path_is_file "$new" &&
+	test_cmp repo/.git/info/sparse-checkout "$new" &&
+	git -C worktree sparse-checkout set --cone &&
+	test_cmp_config -C worktree true core.sparseCheckoutCone &&
+	test_must_fail git -C repo core.sparseCheckoutCone
+'
+
 test_expect_success 'cone mode: match patterns' '
 	git -C repo config --worktree core.sparseCheckoutCone true &&
 	rm -rf repo/a repo/folder1 repo/folder2 &&
 	git -C repo read-tree -mu HEAD 2>err &&
-	test_i18ngrep ! "disabling cone patterns" err &&
+	test_grep ! "disabling cone patterns" err &&
 	git -C repo reset --hard &&
 	check_files repo a folder1 folder2
 '
@@ -188,9 +238,9 @@ test_expect_success 'cone mode: match patterns' '
 test_expect_success 'cone mode: warn on bad pattern' '
 	test_when_finished mv sparse-checkout repo/.git/info/ &&
 	cp repo/.git/info/sparse-checkout . &&
-	echo "!/deep/deeper/*" >>repo/.git/info/sparse-checkout &&
+	echo "!/deep/deeper/*/" >>repo/.git/info/sparse-checkout &&
 	git -C repo read-tree -mu HEAD 2>err &&
-	test_i18ngrep "unrecognized negative pattern" err
+	test_grep "unrecognized negative pattern" err
 '
 
 test_expect_success 'sparse-checkout disable' '
@@ -202,10 +252,38 @@ test_expect_success 'sparse-checkout disable' '
 	check_files repo a deep folder1 folder2
 '
 
+test_expect_success 'sparse-index enabled and disabled' '
+	git -C repo sparse-checkout init --cone --sparse-index &&
+	test_cmp_config -C repo true index.sparse &&
+	git -C repo ls-files --sparse >sparse &&
+	git -C repo sparse-checkout disable &&
+	git -C repo ls-files --sparse >full &&
+
+	cat >expect <<-\EOF &&
+	@@ -1,4 +1,7 @@
+	 a
+	-deep/
+	-folder1/
+	-folder2/
+	+deep/a
+	+deep/deeper1/a
+	+deep/deeper1/deepest/a
+	+deep/deeper2/a
+	+folder1/a
+	+folder2/a
+	EOF
+
+	diff -u sparse full | tail -n +3 >actual &&
+	test_cmp expect actual &&
+
+	git -C repo config --list >config &&
+	test_cmp_config -C repo false index.sparse
+'
+
 test_expect_success 'cone mode: init and set' '
 	git -C repo sparse-checkout init --cone &&
 	git -C repo config --list >config &&
-	test_i18ngrep "core.sparsecheckoutcone=true" config &&
+	test_grep "core.sparsecheckoutcone=true" config &&
 	list_files repo >dir  &&
 	echo a >expect &&
 	test_cmp expect dir &&
@@ -256,7 +334,7 @@ test_expect_success 'cone mode: set with nested folders' '
 
 test_expect_success 'cone mode: add independent path' '
 	git -C repo sparse-checkout set deep/deeper1 &&
-	git -C repo sparse-checkout add folder1 &&
+	git -C repo sparse-checkout add --end-of-options folder1 &&
 	cat >expect <<-\EOF &&
 	/*
 	!/*/
@@ -308,7 +386,7 @@ test_expect_success 'not-up-to-date does not block rest of sparsification' '
 
 	git -C repo sparse-checkout set deep/deeper1 2>err &&
 
-	test_i18ngrep "The following paths are not up to date" err &&
+	test_grep "The following paths are not up to date" err &&
 	test_cmp expect repo/.git/info/sparse-checkout &&
 	check_files repo/deep a deeper1 deeper2 &&
 	check_files repo/deep/deeper1 a deepest &&
@@ -323,9 +401,9 @@ test_expect_success 'revert to old sparse-checkout on empty update' '
 		git add file &&
 		git commit -m "test" &&
 		git sparse-checkout set nothing 2>err &&
-		test_i18ngrep ! "Sparse checkout leaves no entry on working directory" err &&
-		test_i18ngrep ! ".git/index.lock" err &&
-		git sparse-checkout set file
+		test_grep ! "Sparse checkout leaves no entry on working directory" err &&
+		test_grep ! ".git/index.lock" err &&
+		git sparse-checkout set --no-cone file
 	)
 '
 
@@ -333,32 +411,32 @@ test_expect_success 'fail when lock is taken' '
 	test_when_finished rm -rf repo/.git/info/sparse-checkout.lock &&
 	touch repo/.git/info/sparse-checkout.lock &&
 	test_must_fail git -C repo sparse-checkout set deep 2>err &&
-	test_i18ngrep "Unable to create .*\.lock" err
+	test_grep "Unable to create .*\.lock" err
 '
 
 test_expect_success '.gitignore should not warn about cone mode' '
 	git -C repo config --worktree core.sparseCheckoutCone true &&
 	echo "**/bin/*" >repo/.gitignore &&
 	git -C repo reset --hard 2>err &&
-	test_i18ngrep ! "disabling cone patterns" err
+	test_grep ! "disabling cone patterns" err
 '
 
 test_expect_success 'sparse-checkout (init|set|disable) warns with dirty status' '
 	git clone repo dirty &&
 	echo dirty >dirty/folder1/a &&
 
-	git -C dirty sparse-checkout init 2>err &&
-	test_i18ngrep "warning.*The following paths are not up to date" err &&
+	git -C dirty sparse-checkout init --no-cone 2>err &&
+	test_grep "warning.*The following paths are not up to date" err &&
 
 	git -C dirty sparse-checkout set /folder2/* /deep/deeper1/* 2>err &&
-	test_i18ngrep "warning.*The following paths are not up to date" err &&
+	test_grep "warning.*The following paths are not up to date" err &&
 	test_path_is_file dirty/folder1/a &&
 
 	git -C dirty sparse-checkout disable 2>err &&
 	test_must_be_empty err &&
 
 	git -C dirty reset --hard &&
-	git -C dirty sparse-checkout init &&
+	git -C dirty sparse-checkout init --no-cone &&
 	git -C dirty sparse-checkout set /folder2/* /deep/deeper1/* &&
 	test_path_is_missing dirty/folder1/a &&
 	git -C dirty sparse-checkout disable &&
@@ -374,23 +452,23 @@ test_expect_success 'sparse-checkout (init|set|disable) warns with unmerged stat
 	EOF
 	git -C unmerged update-index --index-info <input &&
 
-	git -C unmerged sparse-checkout init 2>err &&
-	test_i18ngrep "warning.*The following paths are unmerged" err &&
+	git -C unmerged sparse-checkout init --no-cone 2>err &&
+	test_grep "warning.*The following paths are unmerged" err &&
 
 	git -C unmerged sparse-checkout set /folder2/* /deep/deeper1/* 2>err &&
-	test_i18ngrep "warning.*The following paths are unmerged" err &&
+	test_grep "warning.*The following paths are unmerged" err &&
 	test_path_is_file dirty/folder1/a &&
 
 	git -C unmerged sparse-checkout disable 2>err &&
-	test_i18ngrep "warning.*The following paths are unmerged" err &&
+	test_grep "warning.*The following paths are unmerged" err &&
 
 	git -C unmerged reset --hard &&
-	git -C unmerged sparse-checkout init &&
+	git -C unmerged sparse-checkout init --no-cone &&
 	git -C unmerged sparse-checkout set /folder2/* /deep/deeper1/* &&
 	git -C unmerged sparse-checkout disable
 '
 
-test_expect_success 'sparse-checkout reapply' '
+test_expect_failure 'sparse-checkout reapply' '
 	git clone repo tweak &&
 
 	echo dirty >tweak/deep/deeper2/a &&
@@ -402,26 +480,28 @@ test_expect_success 'sparse-checkout reapply' '
 	git -C tweak update-index --index-info <input &&
 
 	git -C tweak sparse-checkout init --cone 2>err &&
-	test_i18ngrep "warning.*The following paths are not up to date" err &&
-	test_i18ngrep "warning.*The following paths are unmerged" err &&
+	test_grep "warning.*The following paths are not up to date" err &&
+	test_grep "warning.*The following paths are unmerged" err &&
 
 	git -C tweak sparse-checkout set folder2 deep/deeper1 2>err &&
-	test_i18ngrep "warning.*The following paths are not up to date" err &&
-	test_i18ngrep "warning.*The following paths are unmerged" err &&
+	test_grep "warning.*The following paths are not up to date" err &&
+	test_grep "warning.*The following paths are unmerged" err &&
 
 	git -C tweak sparse-checkout reapply 2>err &&
-	test_i18ngrep "warning.*The following paths are not up to date" err &&
+	test_grep "warning.*The following paths are not up to date" err &&
 	test_path_is_file tweak/deep/deeper2/a &&
-	test_i18ngrep "warning.*The following paths are unmerged" err &&
+	test_grep "warning.*The following paths are unmerged" err &&
 	test_path_is_file tweak/folder1/a &&
 
 	git -C tweak checkout HEAD deep/deeper2/a &&
 	git -C tweak sparse-checkout reapply 2>err &&
-	test_i18ngrep ! "warning.*The following paths are not up to date" err &&
+	test_grep ! "warning.*The following paths are not up to date" err &&
 	test_path_is_missing tweak/deep/deeper2/a &&
-	test_i18ngrep "warning.*The following paths are unmerged" err &&
+	test_grep "warning.*The following paths are unmerged" err &&
 	test_path_is_file tweak/folder1/a &&
 
+	# NEEDSWORK: We are asking to update a file outside of the
+	# sparse-checkout cone, but this is no longer allowed.
 	git -C tweak add folder1/a &&
 	git -C tweak sparse-checkout reapply 2>err &&
 	test_must_be_empty err &&
@@ -431,6 +511,37 @@ test_expect_success 'sparse-checkout reapply' '
 	git -C tweak sparse-checkout disable
 '
 
+test_expect_success 'reapply can handle config options' '
+	git -C repo sparse-checkout init --cone --no-sparse-index &&
+	git -C repo config --worktree --list >actual &&
+	cat >expect <<-\EOF &&
+	core.sparsecheckout=true
+	core.sparsecheckoutcone=true
+	index.sparse=false
+	EOF
+	test_cmp expect actual &&
+
+	git -C repo sparse-checkout reapply --no-cone --no-sparse-index &&
+	git -C repo config --worktree --list >actual &&
+	cat >expect <<-\EOF &&
+	core.sparsecheckout=true
+	core.sparsecheckoutcone=false
+	index.sparse=false
+	EOF
+	test_cmp expect actual &&
+
+	git -C repo sparse-checkout reapply --cone --sparse-index &&
+	git -C repo config --worktree --list >actual &&
+	cat >expect <<-\EOF &&
+	core.sparsecheckout=true
+	core.sparsecheckoutcone=true
+	index.sparse=true
+	EOF
+	test_cmp expect actual &&
+
+	git -C repo sparse-checkout disable
+'
+
 test_expect_success 'cone mode: set with core.ignoreCase=true' '
 	rm repo/.git/info/sparse-checkout &&
 	git -C repo sparse-checkout init --cone &&
@@ -444,33 +555,45 @@ test_expect_success 'cone mode: set with core.ignoreCase=true' '
 	check_files repo a folder1
 '
 
-test_expect_success 'interaction with submodules' '
+test_expect_success 'setup submodules' '
 	git clone repo super &&
 	(
 		cd super &&
 		mkdir modules &&
-		git submodule add ../repo modules/child &&
+		git -c protocol.file.allow=always \
+			submodule add ../repo modules/child &&
 		git add . &&
 		git commit -m "add submodule" &&
 		git sparse-checkout init --cone &&
 		git sparse-checkout set folder1
-	) &&
+	)
+'
+
+test_expect_success 'interaction with submodules' '
 	check_files super a folder1 modules &&
 	check_files super/modules/child a deep folder1 folder2
 '
 
+test_expect_success 'check-rules interaction with submodules' '
+	git -C super ls-tree --name-only -r HEAD >all-files &&
+	git -C super sparse-checkout check-rules >check-rules-matches <all-files &&
+
+	test_grep ! "modules/" check-rules-matches &&
+	test_grep "folder1/" check-rules-matches
+'
+
 test_expect_success 'different sparse-checkouts with worktrees' '
+	git -C repo sparse-checkout set --cone deep folder1 &&
 	git -C repo worktree add --detach ../worktree &&
-	check_files worktree "a deep folder1 folder2" &&
-	git -C worktree sparse-checkout init --cone &&
-	git -C repo sparse-checkout set folder1 &&
-	git -C worktree sparse-checkout set deep/deeper1 &&
-	check_files repo a folder1 &&
-	check_files worktree a deep
+	check_files worktree "a deep folder1" &&
+	git -C repo sparse-checkout set --cone folder1 &&
+	git -C worktree sparse-checkout set --cone deep/deeper1 &&
+	check_files repo "a folder1" &&
+	check_files worktree "a deep"
 '
 
 test_expect_success 'set using filename keeps file on-disk' '
-	git -C repo sparse-checkout set a deep &&
+	git -C repo sparse-checkout set --skip-checks a deep &&
 	cat >expect <<-\EOF &&
 	/*
 	!/*/
@@ -493,7 +616,7 @@ check_read_tree_errors () {
 	then
 		test_must_be_empty err
 	else
-		test_i18ngrep "$ERRORS" err
+		test_grep "$ERRORS" err
 	fi &&
 	check_files $REPO $FILES
 }
@@ -555,6 +678,15 @@ test_expect_success 'pattern-checks: starting "*"' '
 	check_read_tree_errors repo "a deep" "disabling cone pattern matching"
 '
 
+test_expect_success 'pattern-checks: non directory pattern' '
+	cat >repo/.git/info/sparse-checkout <<-\EOF &&
+	/deep/deeper1/a
+	EOF
+	check_read_tree_errors repo deep "disabling cone pattern matching" &&
+	check_files repo/deep deeper1 &&
+	check_files repo/deep/deeper1 a
+'
+
 test_expect_success 'pattern-checks: contained glob characters' '
 	for c in "[a]" "\\" "?" "*"
 	do
@@ -563,7 +695,7 @@ test_expect_success 'pattern-checks: contained glob characters' '
 		!/*/
 		something$c-else/
 		EOF
-		check_read_tree_errors repo "a" "disabling cone pattern matching"
+		check_read_tree_errors repo "a" "disabling cone pattern matching" || return 1
 	done
 '
 
@@ -581,7 +713,7 @@ test_expect_success BSLASHPSPEC 'pattern-checks: escaped characters' '
 	git -C escaped reset --hard $COMMIT &&
 	check_files escaped "a deep folder1 folder2 zbad\\dir zdoes*exist" zglob[!a]? &&
 	git -C escaped sparse-checkout init --cone &&
-	git -C escaped sparse-checkout set zbad\\dir/bogus "zdoes*not*exist" "zdoes*exist" "zglob[!a]?" &&
+	git -C escaped sparse-checkout set --skip-checks zbad\\dir/bogus "zdoes*not*exist" "zdoes*exist" "zglob[!a]?" &&
 	cat >expect <<-\EOF &&
 	/*
 	!/*/
@@ -626,4 +758,297 @@ test_expect_success MINGW 'cone mode replaces backslashes with slashes' '
 	check_files repo/deep a deeper1
 '
 
+test_expect_success 'cone mode clears ignored subdirectories' '
+	rm repo/.git/info/sparse-checkout &&
+
+	git -C repo sparse-checkout init --cone &&
+	git -C repo sparse-checkout set deep/deeper1 &&
+
+	cat >repo/.gitignore <<-\EOF &&
+	obj/
+	*.o
+	EOF
+
+	git -C repo add .gitignore &&
+	git -C repo commit -m ".gitignore" &&
+
+	mkdir -p repo/obj repo/folder1/obj repo/deep/deeper2/obj &&
+	for file in folder1/obj/a obj/a folder1/file.o folder1.o \
+		    deep/deeper2/obj/a deep/deeper2/file.o file.o
+	do
+		echo ignored >repo/$file || return 1
+	done &&
+
+	git -C repo status --porcelain=v2 >out &&
+	test_must_be_empty out &&
+
+	git -C repo sparse-checkout reapply &&
+	test_path_is_missing repo/folder1 &&
+	test_path_is_missing repo/deep/deeper2 &&
+	test_path_is_dir repo/obj &&
+	test_path_is_file repo/file.o &&
+
+	git -C repo status --porcelain=v2 >out &&
+	test_must_be_empty out &&
+
+	git -C repo sparse-checkout set deep/deeper2 &&
+	test_path_is_missing repo/deep/deeper1 &&
+	test_path_is_dir repo/deep/deeper2 &&
+	test_path_is_dir repo/obj &&
+	test_path_is_file repo/file.o &&
+
+	>repo/deep/deeper2/ignored.o &&
+	>repo/deep/deeper2/untracked &&
+
+	# When an untracked file is in the way, all untracked files
+	# (even ignored files) are preserved.
+	git -C repo sparse-checkout set folder1 2>err &&
+	grep "contains untracked files" err &&
+	test_path_is_file repo/deep/deeper2/ignored.o &&
+	test_path_is_file repo/deep/deeper2/untracked &&
+
+	# The rest of the cone matches expectation
+	test_path_is_missing repo/deep/deeper1 &&
+	test_path_is_dir repo/obj &&
+	test_path_is_file repo/file.o &&
+
+	git -C repo status --porcelain=v2 >out &&
+	echo "? deep/deeper2/untracked" >expect &&
+	test_cmp expect out
+'
+
+test_expect_success 'malformed cone-mode patterns' '
+	git -C repo sparse-checkout init --cone &&
+	mkdir -p repo/foo/bar &&
+	touch repo/foo/bar/x repo/foo/y &&
+	cat >repo/.git/info/sparse-checkout <<-\EOF &&
+	/*
+	!/*/
+	/foo/
+	!/foo/*/
+	/foo/\*/
+	EOF
+
+	# Listing the patterns will notice the duplicate pattern and
+	# emit a warning. It will list the patterns directly instead
+	# of using the cone-mode translation to a set of directories.
+	git -C repo sparse-checkout list >actual 2>err &&
+	test_cmp repo/.git/info/sparse-checkout actual &&
+	grep "warning: your sparse-checkout file may have issues: pattern .* is repeated" err &&
+	grep "warning: disabling cone pattern matching" err
+'
+
+test_expect_success 'set from subdir pays attention to prefix' '
+	git -C repo sparse-checkout disable &&
+	git -C repo/deep sparse-checkout set --cone deeper2 ../folder1 &&
+
+	git -C repo sparse-checkout list >actual &&
+
+	cat >expect <<-\EOF &&
+	deep/deeper2
+	folder1
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'add from subdir pays attention to prefix' '
+	git -C repo sparse-checkout set --cone deep/deeper2 &&
+	git -C repo/deep sparse-checkout add deeper1/deepest ../folder1 &&
+
+	git -C repo sparse-checkout list >actual &&
+
+	cat >expect <<-\EOF &&
+	deep/deeper1/deepest
+	deep/deeper2
+	folder1
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'set from subdir in non-cone mode throws an error' '
+	git -C repo sparse-checkout disable &&
+	test_must_fail git -C repo/deep sparse-checkout set --no-cone deeper2 ../folder1 2>error &&
+
+	grep "run from the toplevel directory in non-cone mode" error
+'
+
+test_expect_success 'set from subdir in non-cone mode throws an error' '
+	git -C repo sparse-checkout set --no-cone deep/deeper2 &&
+	test_must_fail git -C repo/deep sparse-checkout add deeper1/deepest ../folder1 2>error &&
+
+	grep "run from the toplevel directory in non-cone mode" error
+'
+
+test_expect_success 'by default, cone mode will error out when passed files' '
+	git -C repo sparse-checkout reapply --cone &&
+	test_must_fail git -C repo sparse-checkout add .gitignore 2>error &&
+
+	grep ".gitignore.*is not a directory" error
+'
+
+test_expect_success 'error on mistyped command line options' '
+	test_must_fail git -C repo sparse-checkout add --sikp-checks .gitignore 2>error &&
+
+	grep "unknown option.*sikp-checks" error
+'
+
+test_expect_success 'by default, non-cone mode will warn on individual files' '
+	git -C repo sparse-checkout reapply --no-cone &&
+	git -C repo sparse-checkout add .gitignore 2>warning &&
+
+	grep "pass a leading slash before paths.*if you want a single file" warning
+'
+
+test_expect_success 'setup bare repo' '
+	git clone --bare "file://$(pwd)/repo" bare
+'
+test_expect_success 'list fails outside work tree' '
+	test_must_fail git -C bare sparse-checkout list 2>err &&
+	test_grep "this operation must be run in a work tree" err
+'
+
+test_expect_success 'add fails outside work tree' '
+	test_must_fail git -C bare sparse-checkout add deeper 2>err &&
+	test_grep "this operation must be run in a work tree" err
+'
+
+test_expect_success 'set fails outside work tree' '
+	test_must_fail git -C bare sparse-checkout set deeper 2>err &&
+	test_grep "this operation must be run in a work tree" err
+'
+
+test_expect_success 'init fails outside work tree' '
+	test_must_fail git -C bare sparse-checkout init 2>err &&
+	test_grep "this operation must be run in a work tree" err
+'
+
+test_expect_success 'reapply fails outside work tree' '
+	test_must_fail git -C bare sparse-checkout reapply 2>err &&
+	test_grep "this operation must be run in a work tree" err
+'
+
+test_expect_success 'disable fails outside work tree' '
+	test_must_fail git -C bare sparse-checkout disable 2>err &&
+	test_grep "this operation must be run in a work tree" err
+'
+
+test_expect_success 'setup clean' '
+	git -C repo clean -fdx
+'
+
+test_expect_success 'check-rules cone mode' '
+	cat >rules <<-\EOF &&
+	folder1
+	deep/deeper1/deepest
+	EOF
+
+	git -C bare ls-tree -r --name-only HEAD >all-files &&
+	git -C bare sparse-checkout check-rules --cone \
+		--rules-file ../rules >check-rules-file <all-files &&
+
+	git -C repo sparse-checkout set --cone --stdin <rules&&
+	git -C repo ls-files -t >out &&
+	sed -n "/^S /!s/^. //p" out >ls-files &&
+
+	git -C repo sparse-checkout check-rules >check-rules-default <all-files &&
+
+	test_grep "deep/deeper1/deepest/a" check-rules-file &&
+	test_grep ! "deep/deeper2" check-rules-file &&
+
+	test_cmp check-rules-file ls-files &&
+	test_cmp check-rules-file check-rules-default
+'
+
+test_expect_success 'check-rules non-cone mode' '
+	cat >rules <<-\EOF &&
+	deep/deeper1/deepest/a
+	EOF
+
+	git -C bare ls-tree -r --name-only HEAD >all-files &&
+	git -C bare sparse-checkout check-rules --no-cone --rules-file ../rules\
+		>check-rules-file <all-files &&
+
+	git -C repo sparse-checkout set --no-cone --stdin <rules &&
+	git -C repo ls-files -t >out &&
+	sed -n "/^S /!s/^. //p" out >ls-files &&
+
+	git -C repo sparse-checkout check-rules >check-rules-default <all-files &&
+
+	cat >expect <<-\EOF &&
+	deep/deeper1/deepest/a
+	EOF
+
+	test_cmp expect check-rules-file &&
+	test_cmp check-rules-file ls-files &&
+	test_cmp check-rules-file check-rules-default
+'
+
+test_expect_success 'check-rules cone mode is default' '
+	cat >rules <<-\EOF &&
+	folder1
+	EOF
+
+	cat >all-files <<-\EOF &&
+	toplevel
+	folder2/file
+	folder1/file
+	EOF
+
+	cat >expect <<-\EOF &&
+	toplevel
+	folder1/file
+	EOF
+
+	git -C repo sparse-checkout set --no-cone &&
+	git -C repo sparse-checkout check-rules \
+		--rules-file ../rules >actual <all-files &&
+
+	git -C bare sparse-checkout check-rules \
+		--rules-file ../rules >actual-bare <all-files &&
+
+	test_cmp expect actual &&
+	test_cmp expect actual-bare
+'
+
+test_expect_success 'check-rules quoting' '
+	cat >rules <<-EOF &&
+	"folder\" a"
+	EOF
+	cat >files <<-EOF &&
+	"folder\" a/file"
+	"folder\" b/file"
+	EOF
+	cat >expect <<-EOF &&
+	"folder\" a/file"
+	EOF
+	git sparse-checkout check-rules --cone \
+		--rules-file rules >actual <files &&
+
+	test_cmp expect actual
+'
+
+test_expect_success 'check-rules null termination' '
+	cat >rules <<-EOF &&
+	"folder\" a"
+	EOF
+
+	lf_to_nul >files <<-EOF &&
+	folder" a/a
+	folder" a/b
+	folder" b/fileQ
+	EOF
+
+	cat >expect <<-EOF &&
+	folder" a/aQfolder" a/bQ
+	EOF
+
+	git sparse-checkout check-rules --cone -z \
+		--rules-file rules >actual.nul <files &&
+	nul_to_q <actual.nul >actual &&
+	echo >>actual &&
+
+	test_cmp expect actual
+'
+
+
 test_done
diff --git a/t/t1092-sparse-checkout-compatibility.sh b/t/t1092-sparse-checkout-compatibility.sh
new file mode 100755
index 0000000..2f1ae5f
--- /dev/null
+++ b/t/t1092-sparse-checkout-compatibility.sh
@@ -0,0 +1,2334 @@
+#!/bin/sh
+
+test_description='compare full workdir to sparse workdir'
+
+GIT_TEST_SPLIT_INDEX=0
+GIT_TEST_SPARSE_INDEX=
+
+. ./test-lib.sh
+
+test_expect_success 'setup' '
+	git init initial-repo &&
+	(
+		GIT_TEST_SPARSE_INDEX=0 &&
+		cd initial-repo &&
+		echo a >a &&
+		echo "after deep" >e &&
+		echo "after folder1" >g &&
+		echo "after x" >z &&
+		mkdir folder1 folder2 deep before x &&
+		echo "before deep" >before/a &&
+		echo "before deep again" >before/b &&
+		mkdir deep/deeper1 deep/deeper2 deep/before deep/later &&
+		mkdir deep/deeper1/deepest &&
+		mkdir deep/deeper1/deepest2 &&
+		mkdir deep/deeper1/deepest3 &&
+		echo "after deeper1" >deep/e &&
+		echo "after deepest" >deep/deeper1/e &&
+		cp a folder1 &&
+		cp a folder2 &&
+		cp a x &&
+		cp a deep &&
+		cp a deep/before &&
+		cp a deep/deeper1 &&
+		cp a deep/deeper2 &&
+		cp a deep/later &&
+		cp a deep/deeper1/deepest &&
+		cp a deep/deeper1/deepest2 &&
+		cp a deep/deeper1/deepest3 &&
+		cp -r deep/deeper1/ deep/deeper2 &&
+		mkdir deep/deeper1/0 &&
+		mkdir deep/deeper1/0/0 &&
+		touch deep/deeper1/0/1 &&
+		touch deep/deeper1/0/0/0 &&
+		>folder1- &&
+		>folder1.x &&
+		>folder10 &&
+		cp -r deep/deeper1/0 folder1 &&
+		cp -r deep/deeper1/0 folder2 &&
+		echo >>folder1/0/0/0 &&
+		echo >>folder2/0/1 &&
+		git add . &&
+		git commit -m "initial commit" &&
+		git checkout -b base &&
+		for dir in folder1 folder2 deep
+		do
+			git checkout -b update-$dir base &&
+			echo "updated $dir" >$dir/a &&
+			git commit -a -m "update $dir" || return 1
+		done &&
+
+		git checkout -b rename-base base &&
+		cat >folder1/larger-content <<-\EOF &&
+		matching
+		lines
+		help
+		inexact
+		renames
+		EOF
+		cp folder1/larger-content folder2/ &&
+		cp folder1/larger-content deep/deeper1/ &&
+		git add . &&
+		git commit -m "add interesting rename content" &&
+
+		git checkout -b rename-out-to-out rename-base &&
+		mv folder1/a folder2/b &&
+		mv folder1/larger-content folder2/edited-content &&
+		echo >>folder2/edited-content &&
+		echo >>folder2/0/1 &&
+		echo stuff >>deep/deeper1/a &&
+		git add . &&
+		git commit -m "rename folder1/... to folder2/..." &&
+
+		git checkout -b rename-out-to-in rename-base &&
+		mv folder1/a deep/deeper1/b &&
+		echo more stuff >>deep/deeper1/a &&
+		rm folder2/0/1 &&
+		mkdir folder2/0/1 &&
+		echo >>folder2/0/1/1 &&
+		mv folder1/larger-content deep/deeper1/edited-content &&
+		echo >>deep/deeper1/edited-content &&
+		git add . &&
+		git commit -m "rename folder1/... to deep/deeper1/..." &&
+
+		git checkout -b rename-in-to-out rename-base &&
+		mv deep/deeper1/a folder1/b &&
+		echo >>folder2/0/1 &&
+		rm -rf folder1/0/0 &&
+		echo >>folder1/0/0 &&
+		mv deep/deeper1/larger-content folder1/edited-content &&
+		echo >>folder1/edited-content &&
+		git add . &&
+		git commit -m "rename deep/deeper1/... to folder1/..." &&
+
+		git checkout -b df-conflict-1 base &&
+		rm -rf folder1 &&
+		echo content >folder1 &&
+		git add . &&
+		git commit -m "dir to file" &&
+
+		git checkout -b df-conflict-2 base &&
+		rm -rf folder2 &&
+		echo content >folder2 &&
+		git add . &&
+		git commit -m "dir to file" &&
+
+		git checkout -b fd-conflict base &&
+		rm a &&
+		mkdir a &&
+		echo content >a/a &&
+		git add . &&
+		git commit -m "file to dir" &&
+
+		for side in left right
+		do
+			git checkout -b merge-$side base &&
+			echo $side >>deep/deeper2/a &&
+			echo $side >>folder1/a &&
+			echo $side >>folder2/a &&
+			git add . &&
+			git commit -m "$side" || return 1
+		done &&
+
+		git checkout -b deepest base &&
+		echo "updated deepest" >deep/deeper1/deepest/a &&
+		echo "updated deepest2" >deep/deeper1/deepest2/a &&
+		echo "updated deepest3" >deep/deeper1/deepest3/a &&
+		git commit -a -m "update deepest" &&
+
+		git checkout -f base &&
+		git reset --hard
+	)
+'
+
+init_repos () {
+	rm -rf full-checkout sparse-checkout sparse-index &&
+
+	# create repos in initial state
+	cp -r initial-repo full-checkout &&
+	git -C full-checkout reset --hard &&
+
+	cp -r initial-repo sparse-checkout &&
+	git -C sparse-checkout reset --hard &&
+
+	cp -r initial-repo sparse-index &&
+	git -C sparse-index reset --hard &&
+
+	# initialize sparse-checkout definitions
+	git -C sparse-checkout sparse-checkout init --cone &&
+	git -C sparse-checkout sparse-checkout set deep &&
+	git -C sparse-index sparse-checkout init --cone --sparse-index &&
+	test_cmp_config -C sparse-index true index.sparse &&
+	git -C sparse-index sparse-checkout set deep
+}
+
+init_repos_as_submodules () {
+	git reset --hard &&
+	init_repos &&
+	git submodule add ./full-checkout &&
+	git submodule add ./sparse-checkout &&
+	git submodule add ./sparse-index &&
+
+	git submodule status >actual &&
+	grep full-checkout actual &&
+	grep sparse-checkout actual &&
+	grep sparse-index actual
+}
+
+run_on_sparse () {
+	(
+		cd sparse-checkout &&
+		GIT_PROGRESS_DELAY=100000 "$@" >../sparse-checkout-out 2>../sparse-checkout-err
+	) &&
+	(
+		cd sparse-index &&
+		GIT_PROGRESS_DELAY=100000 "$@" >../sparse-index-out 2>../sparse-index-err
+	)
+}
+
+run_on_all () {
+	(
+		cd full-checkout &&
+		GIT_PROGRESS_DELAY=100000 "$@" >../full-checkout-out 2>../full-checkout-err
+	) &&
+	run_on_sparse "$@"
+}
+
+test_all_match () {
+	run_on_all "$@" &&
+	test_cmp full-checkout-out sparse-checkout-out &&
+	test_cmp full-checkout-out sparse-index-out &&
+	test_cmp full-checkout-err sparse-checkout-err &&
+	test_cmp full-checkout-err sparse-index-err
+}
+
+test_sparse_match () {
+	run_on_sparse "$@" &&
+	test_cmp sparse-checkout-out sparse-index-out &&
+	test_cmp sparse-checkout-err sparse-index-err
+}
+
+test_sparse_unstaged () {
+	file=$1 &&
+	for repo in sparse-checkout sparse-index
+	do
+		# Skip "unmerged" paths
+		git -C $repo diff --staged --diff-filter=u -- "$file" >diff &&
+		test_must_be_empty diff || return 1
+	done
+}
+
+# Usage: test_sprase_checkout_set "<c1> ... <cN>" "<s1> ... <sM>"
+# Verifies that "git sparse-checkout set <c1> ... <cN>" succeeds and
+# leaves the sparse index in a state where <s1> ... <sM> are sparse
+# directories (and <c1> ... <cN> are not).
+test_sparse_checkout_set () {
+	CONE_DIRS=$1 &&
+	SPARSE_DIRS=$2 &&
+	git -C sparse-index sparse-checkout set --skip-checks $CONE_DIRS &&
+	git -C sparse-index ls-files --sparse --stage >cache &&
+
+	# Check that the directories outside of the sparse-checkout cone
+	# have sparse directory entries.
+	for dir in $SPARSE_DIRS
+	do
+		TREE=$(git -C sparse-index rev-parse HEAD:$dir) &&
+		grep "040000 $TREE 0	$dir/" cache \
+			|| return 1
+	done &&
+
+	# Check that the directories in the sparse-checkout cone
+	# are not sparse directory entries.
+	for dir in $CONE_DIRS
+	do
+		# Allow TREE to not exist because
+		# $dir does not exist at HEAD.
+		TREE=$(git -C sparse-index rev-parse HEAD:$dir) ||
+		! grep "040000 $TREE 0	$dir/" cache \
+			|| return 1
+	done
+}
+
+test_expect_success 'sparse-index contents' '
+	init_repos &&
+
+	# Remove deep, add three other directories.
+	test_sparse_checkout_set \
+		"folder1 folder2 x" \
+		"before deep" &&
+
+	# Remove folder1, add deep
+	test_sparse_checkout_set \
+		"deep folder2 x" \
+		"before folder1" &&
+
+	# Replace deep with deep/deeper2 (dropping deep/deeper1)
+	# Add folder1
+	test_sparse_checkout_set \
+		"deep/deeper2 folder1 folder2 x" \
+		"before deep/deeper1" &&
+
+	# Replace deep/deeper2 with deep/deeper1
+	# Replace folder1 with folder1/0/0
+	# Replace folder2 with non-existent folder2/2/3
+	# Add non-existent "bogus"
+	test_sparse_checkout_set \
+		"bogus deep/deeper1 folder1/0/0 folder2/2/3 x" \
+		"before deep/deeper2 folder2/0" &&
+
+	# Drop down to only files at root
+	test_sparse_checkout_set \
+		"" \
+		"before deep folder1 folder2 x" &&
+
+	# Disabling the sparse-index replaces tree entries with full ones
+	git -C sparse-index sparse-checkout init --no-sparse-index &&
+	test_sparse_match git ls-files --stage --sparse
+'
+
+test_expect_success 'expanded in-memory index matches full index' '
+	init_repos &&
+	test_sparse_match git ls-files --stage
+'
+
+test_expect_success 'root directory cannot be sparse' '
+	init_repos &&
+
+	# Remove all in-cone files and directories from the index, collapse index
+	# with `git sparse-checkout reapply`
+	git -C sparse-index rm -r . &&
+	git -C sparse-index sparse-checkout reapply &&
+
+	# Verify sparse directories still present, root directory is not sparse
+	cat >expect <<-EOF &&
+	before/
+	folder1/
+	folder2/
+	x/
+	EOF
+	git -C sparse-index ls-files --sparse >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'status with options' '
+	init_repos &&
+	test_sparse_match ls &&
+	test_all_match git status --porcelain=v2 &&
+	test_all_match git status --porcelain=v2 -z -u &&
+	test_all_match git status --porcelain=v2 -uno &&
+	run_on_all touch README.md &&
+	test_all_match git status --porcelain=v2 &&
+	test_all_match git status --porcelain=v2 -z -u &&
+	test_all_match git status --porcelain=v2 -uno &&
+	test_all_match git add README.md &&
+	test_all_match git status --porcelain=v2 &&
+	test_all_match git status --porcelain=v2 -z -u &&
+	test_all_match git status --porcelain=v2 -uno
+'
+
+test_expect_success 'status with diff in unexpanded sparse directory' '
+	init_repos &&
+	test_all_match git checkout rename-base &&
+	test_all_match git reset --soft rename-out-to-out &&
+	test_all_match git status --porcelain=v2
+'
+
+test_expect_success 'status reports sparse-checkout' '
+	init_repos &&
+	git -C sparse-checkout status >full &&
+	git -C sparse-index status >sparse &&
+	test_grep "You are in a sparse checkout with " full &&
+	test_grep "You are in a sparse checkout." sparse
+'
+
+test_expect_success 'add, commit, checkout' '
+	init_repos &&
+
+	write_script edit-contents <<-\EOF &&
+	echo text >>$1
+	EOF
+	run_on_all ../edit-contents README.md &&
+
+	test_all_match git add README.md &&
+	test_all_match git status --porcelain=v2 &&
+	test_all_match git commit -m "Add README.md" &&
+
+	test_all_match git checkout HEAD~1 &&
+	test_all_match git checkout - &&
+
+	run_on_all ../edit-contents README.md &&
+
+	test_all_match git add -A &&
+	test_all_match git status --porcelain=v2 &&
+	test_all_match git commit -m "Extend README.md" &&
+
+	test_all_match git checkout HEAD~1 &&
+	test_all_match git checkout - &&
+
+	run_on_all ../edit-contents deep/newfile &&
+
+	test_all_match git status --porcelain=v2 -uno &&
+	test_all_match git status --porcelain=v2 &&
+	test_all_match git add . &&
+	test_all_match git status --porcelain=v2 &&
+	test_all_match git commit -m "add deep/newfile" &&
+
+	test_all_match git checkout HEAD~1 &&
+	test_all_match git checkout -
+'
+
+test_expect_success 'deep changes during checkout' '
+	init_repos &&
+
+	test_sparse_match git sparse-checkout set deep/deeper1/deepest &&
+	test_all_match git checkout deepest &&
+	test_all_match git checkout base
+'
+
+test_expect_success 'checkout with modified sparse directory' '
+	init_repos &&
+
+	test_all_match git checkout rename-in-to-out -- . &&
+	test_sparse_match git sparse-checkout reapply &&
+	test_all_match git checkout base
+'
+
+test_expect_success 'checkout orphan then non-orphan' '
+	init_repos &&
+
+	test_all_match git checkout --orphan test-orphan &&
+	test_all_match git status --porcelain=v2 &&
+	test_all_match git checkout base &&
+	test_all_match git status --porcelain=v2
+'
+
+test_expect_success 'add outside sparse cone' '
+	init_repos &&
+
+	run_on_sparse mkdir folder1 &&
+	run_on_sparse ../edit-contents folder1/a &&
+	run_on_sparse ../edit-contents folder1/newfile &&
+	test_sparse_match test_must_fail git add folder1/a &&
+	grep "Disable or modify the sparsity rules" sparse-checkout-err &&
+	test_sparse_unstaged folder1/a &&
+	test_sparse_match test_must_fail git add folder1/newfile &&
+	grep "Disable or modify the sparsity rules" sparse-checkout-err &&
+	test_sparse_unstaged folder1/newfile
+'
+
+test_expect_success 'commit including unstaged changes' '
+	init_repos &&
+
+	write_script edit-file <<-\EOF &&
+	echo $1 >$2
+	EOF
+
+	run_on_all ../edit-file 1 a &&
+	run_on_all ../edit-file 1 deep/a &&
+
+	test_all_match git commit -m "-a" -a &&
+	test_all_match git status --porcelain=v2 &&
+
+	run_on_all ../edit-file 2 a &&
+	run_on_all ../edit-file 2 deep/a &&
+
+	test_all_match git commit -m "--include" --include deep/a &&
+	test_all_match git status --porcelain=v2 &&
+	test_all_match git commit -m "--include" --include a &&
+	test_all_match git status --porcelain=v2 &&
+
+	run_on_all ../edit-file 3 a &&
+	run_on_all ../edit-file 3 deep/a &&
+
+	test_all_match git commit -m "--amend" -a --amend &&
+	test_all_match git status --porcelain=v2
+'
+
+test_expect_success 'status/add: outside sparse cone' '
+	init_repos &&
+
+	# folder1 is at HEAD, but outside the sparse cone
+	run_on_sparse mkdir folder1 &&
+	cp initial-repo/folder1/a sparse-checkout/folder1/a &&
+	cp initial-repo/folder1/a sparse-index/folder1/a &&
+
+	test_sparse_match git status &&
+
+	write_script edit-contents <<-\EOF &&
+	echo text >>$1
+	EOF
+	run_on_all ../edit-contents folder1/a &&
+	run_on_all ../edit-contents folder1/new &&
+
+	test_sparse_match git status --porcelain=v2 &&
+
+	# Adding the path outside of the sparse-checkout cone should fail.
+	test_sparse_match test_must_fail git add folder1/a &&
+	grep "Disable or modify the sparsity rules" sparse-checkout-err &&
+	test_sparse_unstaged folder1/a &&
+	test_all_match git add --refresh folder1/a &&
+	test_must_be_empty sparse-checkout-err &&
+	test_sparse_unstaged folder1/a &&
+	test_sparse_match test_must_fail git add folder1/new &&
+	grep "Disable or modify the sparsity rules" sparse-checkout-err &&
+	test_sparse_unstaged folder1/new &&
+	test_sparse_match git add --sparse folder1/a &&
+	test_sparse_match git add --sparse folder1/new &&
+
+	test_all_match git add --sparse . &&
+	test_all_match git status --porcelain=v2 &&
+	test_all_match git commit -m folder1/new &&
+	test_all_match git rev-parse HEAD^{tree} &&
+
+	run_on_all ../edit-contents folder1/newer &&
+	test_all_match git add --sparse folder1/ &&
+	test_all_match git status --porcelain=v2 &&
+	test_all_match git commit -m folder1/newer &&
+	test_all_match git rev-parse HEAD^{tree}
+'
+
+test_expect_success 'checkout and reset --hard' '
+	init_repos &&
+
+	test_all_match git checkout update-folder1 &&
+	test_all_match git status --porcelain=v2 &&
+
+	test_all_match git checkout update-deep &&
+	test_all_match git status --porcelain=v2 &&
+
+	test_all_match git checkout -b reset-test &&
+	test_all_match git reset --hard deepest &&
+	test_all_match git reset --hard update-folder1 &&
+	test_all_match git reset --hard update-folder2
+'
+
+test_expect_success 'diff --cached' '
+	init_repos &&
+
+	write_script edit-contents <<-\EOF &&
+	echo text >>README.md
+	EOF
+	run_on_all ../edit-contents &&
+
+	test_all_match git diff &&
+	test_all_match git diff --cached &&
+	test_all_match git add README.md &&
+	test_all_match git diff &&
+	test_all_match git diff --cached
+'
+
+# NEEDSWORK: sparse-checkout behaves differently from full-checkout when
+# running this test with 'df-conflict-2' after 'df-conflict-1'.
+test_expect_success 'diff with renames and conflicts' '
+	init_repos &&
+
+	for branch in rename-out-to-out \
+		      rename-out-to-in \
+		      rename-in-to-out \
+		      df-conflict-1 \
+		      fd-conflict
+	do
+		test_all_match git checkout rename-base &&
+		test_all_match git checkout $branch -- . &&
+		test_all_match git status --porcelain=v2 &&
+		test_all_match git diff --cached --no-renames &&
+		test_all_match git diff --cached --find-renames || return 1
+	done
+'
+
+test_expect_success 'diff with directory/file conflicts' '
+	init_repos &&
+
+	for branch in rename-out-to-out \
+		      rename-out-to-in \
+		      rename-in-to-out \
+		      df-conflict-1 \
+		      df-conflict-2 \
+		      fd-conflict
+	do
+		git -C full-checkout reset --hard &&
+		test_sparse_match git reset --hard &&
+		test_all_match git checkout $branch &&
+		test_all_match git checkout rename-base -- . &&
+		test_all_match git status --porcelain=v2 &&
+		test_all_match git diff --cached --no-renames &&
+		test_all_match git diff --cached --find-renames || return 1
+	done
+'
+
+test_expect_success 'log with pathspec outside sparse definition' '
+	init_repos &&
+
+	test_all_match git log -- a &&
+	test_all_match git log -- folder1/a &&
+	test_all_match git log -- folder2/a &&
+	test_all_match git log -- deep/a &&
+	test_all_match git log -- deep/deeper1/a &&
+	test_all_match git log -- deep/deeper1/deepest/a &&
+
+	test_all_match git checkout update-folder1 &&
+	test_all_match git log -- folder1/a
+'
+
+test_expect_success 'blame with pathspec inside sparse definition' '
+	init_repos &&
+
+	for file in a \
+			deep/a \
+			deep/deeper1/a \
+			deep/deeper1/deepest/a
+	do
+		test_all_match git blame $file || return 1
+	done
+'
+
+# Without a revision specified, blame will error if passed any file that
+# is not present in the working directory (even if the file is tracked).
+# Here we just verify that this is also true with sparse checkouts.
+test_expect_success 'blame with pathspec outside sparse definition' '
+	init_repos &&
+	test_sparse_match git sparse-checkout set &&
+
+	for file in \
+			deep/a \
+			deep/deeper1/a \
+			deep/deeper1/deepest/a
+	do
+		test_sparse_match test_must_fail git blame $file &&
+		cat >expect <<-EOF &&
+		fatal: Cannot lstat '"'"'$file'"'"': No such file or directory
+		EOF
+		# We compare sparse-checkout-err and sparse-index-err in
+		# `test_sparse_match`. Given we know they are the same, we
+		# only check the content of sparse-index-err here.
+		test_cmp expect sparse-index-err || return 1
+	done
+'
+
+test_expect_success 'checkout and reset (mixed)' '
+	init_repos &&
+
+	test_all_match git checkout -b reset-test update-deep &&
+	test_all_match git reset deepest &&
+
+	# Because skip-worktree is preserved, resetting to update-folder1
+	# will show worktree changes for folder1/a in full-checkout, but not
+	# in sparse-checkout or sparse-index.
+	git -C full-checkout reset update-folder1 >full-checkout-out &&
+	test_sparse_match git reset update-folder1 &&
+	grep "M	folder1/a" full-checkout-out &&
+	! grep "M	folder1/a" sparse-checkout-out &&
+	run_on_sparse test_path_is_missing folder1
+'
+
+test_expect_success 'checkout and reset (merge)' '
+	init_repos &&
+
+	write_script edit-contents <<-\EOF &&
+	echo text >>$1
+	EOF
+
+	test_all_match git checkout -b reset-test update-deep &&
+	run_on_all ../edit-contents a &&
+	test_all_match git reset --merge deepest &&
+	test_all_match git status --porcelain=v2 &&
+
+	test_all_match git reset --hard update-deep &&
+	run_on_all ../edit-contents deep/a &&
+	test_all_match test_must_fail git reset --merge deepest
+'
+
+test_expect_success 'checkout and reset (keep)' '
+	init_repos &&
+
+	write_script edit-contents <<-\EOF &&
+	echo text >>$1
+	EOF
+
+	test_all_match git checkout -b reset-test update-deep &&
+	run_on_all ../edit-contents a &&
+	test_all_match git reset --keep deepest &&
+	test_all_match git status --porcelain=v2 &&
+
+	test_all_match git reset --hard update-deep &&
+	run_on_all ../edit-contents deep/a &&
+	test_all_match test_must_fail git reset --keep deepest
+'
+
+test_expect_success 'reset with pathspecs inside sparse definition' '
+	init_repos &&
+
+	write_script edit-contents <<-\EOF &&
+	echo text >>$1
+	EOF
+
+	test_all_match git checkout -b reset-test update-deep &&
+	run_on_all ../edit-contents deep/a &&
+
+	test_all_match git reset base -- deep/a &&
+	test_all_match git status --porcelain=v2 &&
+
+	test_all_match git reset base -- nonexistent-file &&
+	test_all_match git status --porcelain=v2 &&
+
+	test_all_match git reset deepest -- deep &&
+	test_all_match git status --porcelain=v2
+'
+
+# Although the working tree differs between full and sparse checkouts after
+# reset, the state of the index is the same.
+test_expect_success 'reset with pathspecs outside sparse definition' '
+	init_repos &&
+	test_all_match git checkout -b reset-test base &&
+
+	test_sparse_match git reset update-folder1 -- folder1 &&
+	git -C full-checkout reset update-folder1 -- folder1 &&
+	test_all_match git ls-files -s -- folder1 &&
+
+	test_sparse_match git reset update-folder2 -- folder2/a &&
+	git -C full-checkout reset update-folder2 -- folder2/a &&
+	test_all_match git ls-files -s -- folder2/a
+'
+
+test_expect_success 'reset with wildcard pathspec' '
+	init_repos &&
+
+	test_all_match git reset update-deep -- deep\* &&
+	test_all_match git ls-files -s -- deep &&
+
+	test_all_match git reset deepest -- deep\*\*\* &&
+	test_all_match git ls-files -s -- deep &&
+
+	# The following `git reset`s result in updating the index on files with
+	# `skip-worktree` enabled. To avoid failing due to discrepencies in reported
+	# "modified" files, `test_sparse_match` reset is performed separately from
+	# "full-checkout" reset, then the index contents of all repos are verified.
+
+	test_sparse_match git reset update-folder1 -- \*/a &&
+	git -C full-checkout reset update-folder1 -- \*/a &&
+	test_all_match git ls-files -s -- deep/a folder1/a &&
+
+	test_sparse_match git reset update-folder2 -- folder\* &&
+	git -C full-checkout reset update-folder2 -- folder\* &&
+	test_all_match git ls-files -s -- folder10 folder1 folder2 &&
+
+	test_sparse_match git reset base -- folder1/\* &&
+	git -C full-checkout reset base -- folder1/\* &&
+	test_all_match git ls-files -s -- folder1
+'
+
+test_expect_success 'reset hard with removed sparse dir' '
+	init_repos &&
+
+	run_on_all git rm -r --sparse folder1 &&
+	test_all_match git status --porcelain=v2 &&
+
+	test_all_match git reset --hard &&
+	test_all_match git status --porcelain=v2 &&
+
+	cat >expect <<-\EOF &&
+	folder1/
+	EOF
+
+	git -C sparse-index ls-files --sparse folder1 >out &&
+	test_cmp expect out
+'
+
+test_expect_success 'update-index modify outside sparse definition' '
+	init_repos &&
+
+	write_script edit-contents <<-\EOF &&
+	echo text >>$1
+	EOF
+
+	# Create & modify folder1/a
+	# Note that this setup is a manual way of reaching the erroneous
+	# condition in which a `skip-worktree` enabled, outside-of-cone file
+	# exists on disk. It is used here to ensure `update-index` is stable
+	# and behaves predictably if such a condition occurs.
+	run_on_sparse mkdir -p folder1 &&
+	run_on_sparse cp ../initial-repo/folder1/a folder1/a &&
+	run_on_all ../edit-contents folder1/a &&
+
+	# If file has skip-worktree enabled, but the file is present, it is
+	# treated the same as if skip-worktree is disabled
+	test_all_match git status --porcelain=v2 &&
+	test_all_match git update-index folder1/a &&
+	test_all_match git status --porcelain=v2 &&
+
+	# When skip-worktree is disabled (even on files outside sparse cone), file
+	# is updated in the index
+	test_sparse_match git update-index --no-skip-worktree folder1/a &&
+	test_all_match git status --porcelain=v2 &&
+	test_all_match git update-index folder1/a &&
+	test_all_match git status --porcelain=v2
+'
+
+test_expect_success 'update-index --add outside sparse definition' '
+	init_repos &&
+
+	write_script edit-contents <<-\EOF &&
+	echo text >>$1
+	EOF
+
+	# Create folder1, add new file
+	run_on_sparse mkdir -p folder1 &&
+	run_on_all ../edit-contents folder1/b &&
+
+	# The *untracked* out-of-cone file is added to the index because it does
+	# not have a `skip-worktree` bit to signal that it should be ignored
+	# (unlike in `git add`, which will fail due to the file being outside
+	# the sparse checkout definition).
+	test_all_match git update-index --add folder1/b &&
+	test_all_match git status --porcelain=v2
+'
+
+# NEEDSWORK: `--remove`, unlike the rest of `update-index`, does not ignore
+# `skip-worktree` entries by default and will remove them from the index.
+# The `--ignore-skip-worktree-entries` flag must be used in conjunction with
+# `--remove` to ignore the `skip-worktree` entries and prevent their removal
+# from the index.
+test_expect_success 'update-index --remove outside sparse definition' '
+	init_repos &&
+
+	# When --ignore-skip-worktree-entries is _not_ specified:
+	# out-of-cone, not-on-disk files are removed from the index
+	test_sparse_match git update-index --remove folder1/a &&
+	cat >expect <<-EOF &&
+	D	folder1/a
+	EOF
+	test_sparse_match git diff --cached --name-status &&
+	test_cmp expect sparse-checkout-out &&
+
+	# Reset the state
+	test_all_match git reset --hard &&
+
+	# When --ignore-skip-worktree-entries is specified, out-of-cone
+	# (skip-worktree) files are ignored
+	test_sparse_match git update-index --remove --ignore-skip-worktree-entries folder1/a &&
+	test_sparse_match git diff --cached --name-status &&
+	test_must_be_empty sparse-checkout-out &&
+
+	# Reset the state
+	test_all_match git reset --hard &&
+
+	# --force-remove supercedes --ignore-skip-worktree-entries, removing
+	# a skip-worktree file from the index (and disk) when both are specified
+	# with --remove
+	test_sparse_match git update-index --force-remove --ignore-skip-worktree-entries folder1/a &&
+	cat >expect <<-EOF &&
+	D	folder1/a
+	EOF
+	test_sparse_match git diff --cached --name-status &&
+	test_cmp expect sparse-checkout-out
+'
+
+test_expect_success 'update-index with directories' '
+	init_repos &&
+
+	# update-index will exit silently when provided with a directory name
+	# containing a trailing slash
+	test_all_match git update-index deep/ folder1/ &&
+	grep "Ignoring path deep/" sparse-checkout-err &&
+	grep "Ignoring path folder1/" sparse-checkout-err &&
+
+	# When update-index is given a directory name WITHOUT a trailing slash, it will
+	# behave in different ways depending on the status of the directory on disk:
+	# * if it exists, the command exits with an error ("add individual files instead")
+	# * if it does NOT exist (e.g., in a sparse-checkout), it is assumed to be a
+	#   file and either triggers an error ("does not exist  and --remove not passed")
+	#   or is ignored completely (when using --remove)
+	test_all_match test_must_fail git update-index deep &&
+	run_on_all test_must_fail git update-index folder1 &&
+	test_must_fail git -C full-checkout update-index --remove folder1 &&
+	test_sparse_match git update-index --remove folder1 &&
+	test_all_match git status --porcelain=v2
+'
+
+test_expect_success 'update-index --again file outside sparse definition' '
+	init_repos &&
+
+	test_all_match git checkout -b test-reupdate &&
+
+	# Update HEAD without modifying the index to introduce a difference in
+	# folder1/a
+	test_sparse_match git reset --soft update-folder1 &&
+
+	# Because folder1/a differs in the index vs HEAD,
+	# `git update-index --no-skip-worktree --again` will effectively perform
+	# `git update-index --no-skip-worktree folder1/a` and remove the skip-worktree
+	# flag from folder1/a
+	test_sparse_match git update-index --no-skip-worktree --again &&
+	test_sparse_match git status --porcelain=v2 &&
+
+	cat >expect <<-EOF &&
+	D	folder1/a
+	EOF
+	test_sparse_match git diff --name-status &&
+	test_cmp expect sparse-checkout-out
+'
+
+test_expect_success 'update-index --cacheinfo' '
+	init_repos &&
+
+	deep_a_oid=$(git -C full-checkout rev-parse update-deep:deep/a) &&
+	folder2_oid=$(git -C full-checkout rev-parse update-folder2:folder2) &&
+	folder1_a_oid=$(git -C full-checkout rev-parse update-folder1:folder1/a) &&
+
+	test_all_match git update-index --cacheinfo 100644 $deep_a_oid deep/a &&
+	test_all_match git status --porcelain=v2 &&
+
+	# Cannot add sparse directory, even in sparse index case
+	test_all_match test_must_fail git update-index --add --cacheinfo 040000 $folder2_oid folder2/ &&
+
+	# Sparse match only: the new outside-of-cone entry is added *without* skip-worktree,
+	# so `git status` reports it as "deleted" in the worktree
+	test_sparse_match git update-index --add --cacheinfo 100644 $folder1_a_oid folder1/a &&
+	test_sparse_match git status --porcelain=v2 &&
+	cat >expect <<-EOF &&
+	MD folder1/a
+	EOF
+	test_sparse_match git status --short -- folder1/a &&
+	test_cmp expect sparse-checkout-out &&
+
+	# To return folder1/a to "normal" for a sparse checkout (ignored &
+	# outside-of-cone), add the skip-worktree flag.
+	test_sparse_match git update-index --skip-worktree folder1/a &&
+	cat >expect <<-EOF &&
+	S folder1/a
+	EOF
+	test_sparse_match git ls-files -t -- folder1/a &&
+	test_cmp expect sparse-checkout-out
+'
+
+for MERGE_TREES in "base HEAD update-folder2" \
+		   "update-folder1 update-folder2" \
+		   "update-folder2"
+do
+	test_expect_success "'read-tree -mu $MERGE_TREES' with files outside sparse definition" '
+		init_repos &&
+
+		# Although the index matches, without --no-sparse-checkout, outside-of-
+		# definition files will not exist on disk for sparse checkouts
+		test_all_match git read-tree -mu $MERGE_TREES &&
+		test_all_match git status --porcelain=v2 &&
+		test_path_is_missing sparse-checkout/folder2 &&
+		test_path_is_missing sparse-index/folder2 &&
+
+		test_all_match git read-tree --reset -u HEAD &&
+		test_all_match git status --porcelain=v2 &&
+
+		test_all_match git read-tree -mu --no-sparse-checkout $MERGE_TREES &&
+		test_all_match git status --porcelain=v2 &&
+		test_cmp sparse-checkout/folder2/a sparse-index/folder2/a &&
+		test_cmp sparse-checkout/folder2/a full-checkout/folder2/a
+
+	'
+done
+
+test_expect_success 'read-tree --merge with edit/edit conflicts in sparse directories' '
+	init_repos &&
+
+	# Merge of multiple changes to same directory (but not same files) should
+	# succeed
+	test_all_match git read-tree -mu base rename-base update-folder1 &&
+	test_all_match git status --porcelain=v2 &&
+
+	test_all_match git reset --hard &&
+
+	test_all_match git read-tree -mu rename-base update-folder2 &&
+	test_all_match git status --porcelain=v2 &&
+
+	test_all_match git reset --hard &&
+
+	test_all_match test_must_fail git read-tree -mu base update-folder1 rename-out-to-in &&
+	test_all_match test_must_fail git read-tree -mu rename-out-to-in update-folder1
+'
+
+test_expect_success 'read-tree --prefix' '
+	init_repos &&
+
+	# If files differing between the index and target <commit-ish> exist
+	# inside the prefix, `read-tree --prefix` should fail
+	test_all_match test_must_fail git read-tree --prefix=deep/ deepest &&
+	test_all_match test_must_fail git read-tree --prefix=folder1/ update-folder1 &&
+
+	# If no differing index entries exist matching the prefix,
+	# `read-tree --prefix` updates the index successfully
+	test_all_match git rm -rf deep/deeper1/deepest/ &&
+	test_all_match git read-tree --prefix=deep/deeper1/deepest -u deepest &&
+	test_all_match git status --porcelain=v2 &&
+
+	run_on_all git rm -rf --sparse folder1/ &&
+	test_all_match git read-tree --prefix=folder1/ -u update-folder1 &&
+	test_all_match git status --porcelain=v2 &&
+
+	test_all_match git rm -rf --sparse folder2/0 &&
+	test_all_match git read-tree --prefix=folder2/0/ -u rename-out-to-out &&
+	test_all_match git status --porcelain=v2
+'
+
+test_expect_success 'read-tree --merge with directory-file conflicts' '
+	init_repos &&
+
+	test_all_match git checkout -b test-branch rename-base &&
+
+	# Although the index matches, without --no-sparse-checkout, outside-of-
+	# definition files will not exist on disk for sparse checkouts
+	test_sparse_match git read-tree -mu rename-out-to-out &&
+	test_sparse_match git status --porcelain=v2 &&
+	test_path_is_missing sparse-checkout/folder2 &&
+	test_path_is_missing sparse-index/folder2 &&
+
+	test_sparse_match git read-tree --reset -u HEAD &&
+	test_sparse_match git status --porcelain=v2 &&
+
+	test_sparse_match git read-tree -mu --no-sparse-checkout rename-out-to-out &&
+	test_sparse_match git status --porcelain=v2 &&
+	test_cmp sparse-checkout/folder2/0/1 sparse-index/folder2/0/1
+'
+
+test_expect_success 'merge, cherry-pick, and rebase' '
+	init_repos &&
+
+	for OPERATION in "merge -m merge" cherry-pick "rebase --apply" "rebase --merge"
+	do
+		test_all_match git checkout -B temp update-deep &&
+		test_all_match git $OPERATION update-folder1 &&
+		test_all_match git rev-parse HEAD^{tree} &&
+		test_all_match git $OPERATION update-folder2 &&
+		test_all_match git rev-parse HEAD^{tree} || return 1
+	done
+'
+
+test_expect_success 'merge with conflict outside cone' '
+	init_repos &&
+
+	test_all_match git checkout -b merge-tip merge-left &&
+	test_all_match git status --porcelain=v2 &&
+	test_all_match test_must_fail git merge -m merge merge-right &&
+	test_all_match git status --porcelain=v2 &&
+
+	# Resolve the conflict in different ways:
+	# 1. Revert to the base
+	test_all_match git checkout base -- deep/deeper2/a &&
+	test_all_match git status --porcelain=v2 &&
+
+	# 2. Add the file with conflict markers
+	test_sparse_match test_must_fail git add folder1/a &&
+	grep "Disable or modify the sparsity rules" sparse-checkout-err &&
+	test_sparse_unstaged folder1/a &&
+	test_all_match git add --sparse folder1/a &&
+	test_all_match git status --porcelain=v2 &&
+
+	# 3. Rename the file to another sparse filename and
+	#    accept conflict markers as resolved content.
+	run_on_all mv folder2/a folder2/z &&
+	test_sparse_match test_must_fail git add folder2 &&
+	grep "Disable or modify the sparsity rules" sparse-checkout-err &&
+	test_sparse_unstaged folder2/z &&
+	test_all_match git add --sparse folder2 &&
+	test_all_match git status --porcelain=v2 &&
+
+	test_all_match git merge --continue &&
+	test_all_match git status --porcelain=v2 &&
+	test_all_match git rev-parse HEAD^{tree}
+'
+
+test_expect_success 'cherry-pick/rebase with conflict outside cone' '
+	init_repos &&
+
+	for OPERATION in cherry-pick rebase
+	do
+		test_all_match git checkout -B tip &&
+		test_all_match git reset --hard merge-left &&
+		test_all_match git status --porcelain=v2 &&
+		test_all_match test_must_fail git $OPERATION merge-right &&
+		test_all_match git status --porcelain=v2 &&
+
+		# Resolve the conflict in different ways:
+		# 1. Revert to the base
+		test_all_match git checkout base -- deep/deeper2/a &&
+		test_all_match git status --porcelain=v2 &&
+
+		# 2. Add the file with conflict markers
+		# NEEDSWORK: Even though the merge conflict removed the
+		# SKIP_WORKTREE bit from the index entry for folder1/a, we should
+		# warn that this is a problematic add.
+		test_sparse_match test_must_fail git add folder1/a &&
+		grep "Disable or modify the sparsity rules" sparse-checkout-err &&
+		test_sparse_unstaged folder1/a &&
+		test_all_match git add --sparse folder1/a &&
+		test_all_match git status --porcelain=v2 &&
+
+		# 3. Rename the file to another sparse filename and
+		#    accept conflict markers as resolved content.
+		# NEEDSWORK: This mode now fails, because folder2/z is
+		# outside of the sparse-checkout cone and does not match an
+		# existing index entry with the SKIP_WORKTREE bit cleared.
+		run_on_all mv folder2/a folder2/z &&
+		test_sparse_match test_must_fail git add folder2 &&
+		grep "Disable or modify the sparsity rules" sparse-checkout-err &&
+		test_sparse_unstaged folder2/z &&
+		test_all_match git add --sparse folder2 &&
+		test_all_match git status --porcelain=v2 &&
+
+		test_all_match git $OPERATION --continue &&
+		test_all_match git status --porcelain=v2 &&
+		test_all_match git rev-parse HEAD^{tree} || return 1
+	done
+'
+
+test_expect_success 'merge with outside renames' '
+	init_repos &&
+
+	for type in out-to-out out-to-in in-to-out
+	do
+		test_all_match git reset --hard &&
+		test_all_match git checkout -f -b merge-$type update-deep &&
+		test_all_match git merge -m "$type" rename-$type &&
+		test_all_match git rev-parse HEAD^{tree} || return 1
+	done
+'
+
+# Sparse-index fails to convert the index in the
+# final 'git cherry-pick' command.
+test_expect_success 'cherry-pick with conflicts' '
+	init_repos &&
+
+	write_script edit-conflict <<-\EOF &&
+	echo $1 >conflict
+	EOF
+
+	test_all_match git checkout -b to-cherry-pick &&
+	run_on_all ../edit-conflict ABC &&
+	test_all_match git add conflict &&
+	test_all_match git commit -m "conflict to pick" &&
+
+	test_all_match git checkout -B base HEAD~1 &&
+	run_on_all ../edit-conflict DEF &&
+	test_all_match git add conflict &&
+	test_all_match git commit -m "conflict in base" &&
+
+	test_all_match test_must_fail git cherry-pick to-cherry-pick
+'
+
+test_expect_success 'stash' '
+	init_repos &&
+
+	write_script edit-contents <<-\EOF &&
+	echo text >>$1
+	EOF
+
+	# Stash a sparse directory (folder1)
+	test_all_match git checkout -b test-branch rename-base &&
+	test_all_match git reset --soft rename-out-to-out &&
+	test_all_match git stash &&
+	test_all_match git status --porcelain=v2 &&
+
+	# Apply the sparse directory stash without reinstating the index
+	test_all_match git stash apply -q &&
+	test_all_match git status --porcelain=v2 &&
+
+	# Reset to state where stash can be applied
+	test_sparse_match git sparse-checkout reapply &&
+	test_all_match git reset --hard rename-out-to-out &&
+
+	# Apply the sparse directory stash *with* reinstating the index
+	test_all_match git stash apply --index -q &&
+	test_all_match git status --porcelain=v2 &&
+
+	# Reset to state where we will get a conflict applying the stash
+	test_sparse_match git sparse-checkout reapply &&
+	test_all_match git reset --hard update-folder1 &&
+
+	# Apply the sparse directory stash with conflicts
+	test_all_match test_must_fail git stash apply --index -q &&
+	test_all_match test_must_fail git stash apply -q &&
+	test_all_match git status --porcelain=v2 &&
+
+	# Reset to base branch
+	test_sparse_match git sparse-checkout reapply &&
+	test_all_match git reset --hard base &&
+
+	# Stash & unstash an untracked file outside of the sparse checkout
+	# definition.
+	run_on_sparse mkdir -p folder1 &&
+	run_on_all ../edit-contents folder1/new &&
+	test_all_match git stash -u &&
+	test_all_match git status --porcelain=v2 &&
+
+	test_all_match git stash pop -q &&
+	test_all_match git status --porcelain=v2
+'
+
+test_expect_success 'checkout-index inside sparse definition' '
+	init_repos &&
+
+	run_on_all rm -f deep/a &&
+	test_all_match git checkout-index -- deep/a &&
+	test_all_match git status --porcelain=v2 &&
+
+	echo test >>new-a &&
+	run_on_all cp ../new-a a &&
+	test_all_match test_must_fail git checkout-index -- a &&
+	test_all_match git checkout-index -f -- a &&
+	test_all_match git status --porcelain=v2
+'
+
+test_expect_success 'checkout-index outside sparse definition' '
+	init_repos &&
+
+	# Without --ignore-skip-worktree-bits, outside-of-cone files will trigger
+	# an error
+	test_sparse_match test_must_fail git checkout-index -- folder1/a &&
+	test_grep "folder1/a has skip-worktree enabled" sparse-checkout-err &&
+	test_path_is_missing folder1/a &&
+
+	# With --ignore-skip-worktree-bits, outside-of-cone files are checked out
+	test_sparse_match git checkout-index --ignore-skip-worktree-bits -- folder1/a &&
+	test_cmp sparse-checkout/folder1/a sparse-index/folder1/a &&
+	test_cmp sparse-checkout/folder1/a full-checkout/folder1/a &&
+
+	run_on_sparse rm -rf folder1 &&
+	echo test >new-a &&
+	run_on_sparse mkdir -p folder1 &&
+	run_on_all cp ../new-a folder1/a &&
+
+	test_all_match test_must_fail git checkout-index --ignore-skip-worktree-bits -- folder1/a &&
+	test_all_match git checkout-index -f --ignore-skip-worktree-bits -- folder1/a &&
+	test_cmp sparse-checkout/folder1/a sparse-index/folder1/a &&
+	test_cmp sparse-checkout/folder1/a full-checkout/folder1/a
+'
+
+test_expect_success 'checkout-index with folders' '
+	init_repos &&
+
+	# Inside checkout definition
+	test_all_match test_must_fail git checkout-index -f -- deep/ &&
+
+	# Outside checkout definition
+	# Note: although all tests fail (as expected), the messaging differs. For
+	# non-sparse index checkouts, the error is that the "file" does not appear
+	# in the index; for sparse checkouts, the error is explicitly that the
+	# entry is a sparse directory.
+	run_on_all test_must_fail git checkout-index -f -- folder1/ &&
+	test_cmp full-checkout-err sparse-checkout-err &&
+	! test_cmp full-checkout-err sparse-index-err &&
+	grep "is a sparse directory" sparse-index-err
+'
+
+test_expect_success 'checkout-index --all' '
+	init_repos &&
+
+	test_all_match git checkout-index --all &&
+	test_sparse_match test_path_is_missing folder1 &&
+
+	# --ignore-skip-worktree-bits will cause `skip-worktree` files to be
+	# checked out, causing the outside-of-cone `folder1` to exist on-disk
+	test_all_match git checkout-index --ignore-skip-worktree-bits --all &&
+	test_all_match test_path_exists folder1
+'
+
+test_expect_success 'clean' '
+	init_repos &&
+
+	echo bogus >>.gitignore &&
+	run_on_all cp ../.gitignore . &&
+	test_all_match git add .gitignore &&
+	test_all_match git commit -m "ignore bogus files" &&
+
+	run_on_sparse mkdir folder1 &&
+	run_on_all mkdir -p deep/untracked-deep &&
+	run_on_all touch folder1/bogus &&
+	run_on_all touch folder1/untracked &&
+	run_on_all touch deep/untracked-deep/bogus &&
+	run_on_all touch deep/untracked-deep/untracked &&
+
+	test_all_match git status --porcelain=v2 &&
+	test_all_match git clean -f &&
+	test_all_match git status --porcelain=v2 &&
+	test_sparse_match ls &&
+	test_sparse_match ls folder1 &&
+	run_on_all test_path_exists folder1/bogus &&
+	run_on_all test_path_is_missing folder1/untracked &&
+	run_on_all test_path_exists deep/untracked-deep/bogus &&
+	run_on_all test_path_exists deep/untracked-deep/untracked &&
+
+	test_all_match git clean -fd &&
+	test_all_match git status --porcelain=v2 &&
+	test_sparse_match ls &&
+	test_sparse_match ls folder1 &&
+	run_on_all test_path_exists folder1/bogus &&
+	run_on_all test_path_exists deep/untracked-deep/bogus &&
+	run_on_all test_path_is_missing deep/untracked-deep/untracked &&
+
+	test_all_match git clean -xf &&
+	test_all_match git status --porcelain=v2 &&
+	test_sparse_match ls &&
+	test_sparse_match ls folder1 &&
+	run_on_all test_path_is_missing folder1/bogus &&
+	run_on_all test_path_exists deep/untracked-deep/bogus &&
+
+	test_all_match git clean -xdf &&
+	test_all_match git status --porcelain=v2 &&
+	test_sparse_match ls &&
+	test_sparse_match ls folder1 &&
+	run_on_all test_path_is_missing deep/untracked-deep/bogus &&
+
+	test_sparse_match test_path_is_dir folder1
+'
+
+for builtin in show rev-parse
+do
+	test_expect_success "$builtin (cached blobs/trees)" "
+		init_repos &&
+
+		test_all_match git $builtin :a &&
+		test_all_match git $builtin :deep/a &&
+		test_sparse_match git $builtin :folder1/a &&
+
+		# The error message differs depending on whether
+		# the directory exists in the worktree.
+		test_all_match test_must_fail git $builtin :deep/ &&
+		test_must_fail git -C full-checkout $builtin :folder1/ &&
+		test_sparse_match test_must_fail git $builtin :folder1/ &&
+
+		# Change the sparse cone for an extra case:
+		run_on_sparse git sparse-checkout set deep/deeper1 &&
+
+		# deep/deeper2 is a sparse directory in the sparse index.
+		test_sparse_match test_must_fail git $builtin :deep/deeper2/ &&
+
+		# deep/deeper2/deepest is not in the sparse index, but
+		# will trigger an index expansion.
+		test_sparse_match test_must_fail git $builtin :deep/deeper2/deepest/
+	"
+done
+
+test_expect_success 'submodule handling' '
+	init_repos &&
+
+	test_sparse_match git sparse-checkout add modules &&
+	test_all_match mkdir modules &&
+	test_all_match touch modules/a &&
+	test_all_match git add modules &&
+	test_all_match git commit -m "add modules directory" &&
+
+	test_config_global protocol.file.allow always &&
+
+	run_on_all git submodule add "$(pwd)/initial-repo" modules/sub &&
+	test_all_match git commit -m "add submodule" &&
+
+	# having a submodule prevents "modules" from collapse
+	test_sparse_match git sparse-checkout set deep/deeper1 &&
+	git -C sparse-index ls-files --sparse --stage >cache &&
+	grep "100644 .*	modules/a" cache &&
+	grep "160000 $(git -C initial-repo rev-parse HEAD) 0	modules/sub" cache
+'
+
+# When working with a sparse index, some commands will need to expand the
+# index to operate properly. If those commands also write the index back
+# to disk, they need to convert the index to sparse before writing.
+# This test verifies that both of these events are logged in trace2 logs.
+test_expect_success 'sparse-index is expanded and converted back' '
+	init_repos &&
+
+	GIT_TRACE2_EVENT="$(pwd)/trace2.txt" \
+		git -C sparse-index reset -- folder1/a &&
+	test_region index convert_to_sparse trace2.txt &&
+	test_region index ensure_full_index trace2.txt &&
+
+	# ls-files expands on read, but does not write.
+	rm trace2.txt &&
+	GIT_TRACE2_EVENT="$(pwd)/trace2.txt" GIT_TRACE2_EVENT_NESTING=10 \
+		git -C sparse-index ls-files &&
+	test_region index ensure_full_index trace2.txt
+'
+
+test_expect_success 'index.sparse disabled inline uses full index' '
+	init_repos &&
+
+	# When index.sparse is disabled inline with `git status`, the
+	# index is expanded at the beginning of the execution then never
+	# converted back to sparse. It is then written to disk as a full index.
+	rm -f trace2.txt &&
+	GIT_TRACE2_EVENT="$(pwd)/trace2.txt" GIT_TRACE2_EVENT_NESTING=10 \
+		git -C sparse-index -c index.sparse=false status &&
+	! test_region index convert_to_sparse trace2.txt &&
+	test_region index ensure_full_index trace2.txt &&
+
+	# Since index.sparse is set to true at a repo level, the index
+	# is converted from full to sparse when read, then never expanded
+	# over the course of `git status`. It is written to disk as a sparse
+	# index.
+	rm -f trace2.txt &&
+	GIT_TRACE2_EVENT="$(pwd)/trace2.txt" GIT_TRACE2_EVENT_NESTING=10 \
+		git -C sparse-index status &&
+	test_region index convert_to_sparse trace2.txt &&
+	! test_region index ensure_full_index trace2.txt &&
+
+	# Now that the index has been written to disk as sparse, it is not
+	# converted to sparse (or expanded to full) when read by `git status`.
+	rm -f trace2.txt &&
+	GIT_TRACE2_EVENT="$(pwd)/trace2.txt" GIT_TRACE2_EVENT_NESTING=10 \
+		git -C sparse-index status &&
+	! test_region index convert_to_sparse trace2.txt &&
+	! test_region index ensure_full_index trace2.txt
+'
+
+run_sparse_index_trace2 () {
+	rm -f trace2.txt &&
+	if test -z "$WITHOUT_UNTRACKED_TXT"
+	then
+		echo >>sparse-index/untracked.txt
+	fi &&
+
+	if test "$1" = "!"
+	then
+		shift &&
+		test_must_fail env \
+			GIT_TRACE2_EVENT="$(pwd)/trace2.txt" \
+			git -C sparse-index "$@" \
+			>sparse-index-out \
+			2>sparse-index-error || return 1
+	else
+		GIT_TRACE2_EVENT="$(pwd)/trace2.txt" \
+			git -C sparse-index "$@" \
+			>sparse-index-out \
+			2>sparse-index-error || return 1
+	fi
+}
+
+ensure_expanded () {
+	run_sparse_index_trace2 "$@" &&
+	test_region index ensure_full_index trace2.txt
+}
+
+ensure_not_expanded () {
+	run_sparse_index_trace2 "$@" &&
+	test_region ! index ensure_full_index trace2.txt
+}
+
+test_expect_success 'sparse-index is not expanded' '
+	init_repos &&
+
+	ensure_not_expanded status &&
+	ensure_not_expanded ls-files --sparse &&
+	ensure_not_expanded commit --allow-empty -m empty &&
+	echo >>sparse-index/a &&
+	ensure_not_expanded commit -a -m a &&
+	echo >>sparse-index/a &&
+	ensure_not_expanded commit --include a -m a &&
+	echo >>sparse-index/deep/deeper1/a &&
+	ensure_not_expanded commit --include deep/deeper1/a -m deeper &&
+	ensure_not_expanded checkout rename-out-to-out &&
+	ensure_not_expanded checkout - &&
+	ensure_not_expanded switch rename-out-to-out &&
+	ensure_not_expanded switch - &&
+	ensure_not_expanded reset --hard &&
+	ensure_not_expanded checkout rename-out-to-out -- deep/deeper1 &&
+	ensure_not_expanded reset --hard &&
+	ensure_not_expanded restore -s rename-out-to-out -- deep/deeper1 &&
+
+	echo >>sparse-index/README.md &&
+	ensure_not_expanded add -A &&
+	echo >>sparse-index/extra.txt &&
+	ensure_not_expanded add extra.txt &&
+	echo >>sparse-index/untracked.txt &&
+	ensure_not_expanded add . &&
+
+	ensure_not_expanded checkout-index -f a &&
+	ensure_not_expanded checkout-index -f --all &&
+	for ref in update-deep update-folder1 update-folder2 update-deep
+	do
+		echo >>sparse-index/README.md &&
+		ensure_not_expanded reset --hard $ref || return 1
+	done &&
+
+	ensure_not_expanded reset --mixed base &&
+	ensure_not_expanded reset --hard update-deep &&
+	ensure_not_expanded reset --keep base &&
+	ensure_not_expanded reset --merge update-deep &&
+	ensure_not_expanded reset --hard &&
+
+	ensure_not_expanded reset base -- deep/a &&
+	ensure_not_expanded reset base -- nonexistent-file &&
+	ensure_not_expanded reset deepest -- deep &&
+
+	# Although folder1 is outside the sparse definition, it exists as a
+	# directory entry in the index, so the pathspec will not force the
+	# index to be expanded.
+	ensure_not_expanded reset deepest -- folder1 &&
+	ensure_not_expanded reset deepest -- folder1/ &&
+
+	# Wildcard identifies only in-cone files, no index expansion
+	ensure_not_expanded reset deepest -- deep/\* &&
+
+	# Wildcard identifies only full sparse directories, no index expansion
+	ensure_not_expanded reset deepest -- folder\* &&
+
+	ensure_not_expanded clean -fd &&
+
+	ensure_not_expanded checkout -f update-deep &&
+	test_config -C sparse-index pull.twohead ort &&
+	(
+		sane_unset GIT_TEST_MERGE_ALGORITHM &&
+		for OPERATION in "merge -m merge" cherry-pick rebase
+		do
+			ensure_not_expanded merge -m merge update-folder1 &&
+			ensure_not_expanded merge -m merge update-folder2 || return 1
+		done
+	)
+'
+
+test_expect_success 'sparse-index is not expanded: merge conflict in cone' '
+	init_repos &&
+
+	for side in right left
+	do
+		git -C sparse-index checkout -b expand-$side base &&
+		echo $side >sparse-index/deep/a &&
+		git -C sparse-index commit -a -m "$side" || return 1
+	done &&
+
+	(
+		sane_unset GIT_TEST_MERGE_ALGORITHM &&
+		git -C sparse-index config pull.twohead ort &&
+		ensure_not_expanded ! merge -m merged expand-right
+	)
+'
+
+test_expect_success 'sparse-index is not expanded: stash' '
+	init_repos &&
+
+	echo >>sparse-index/a &&
+	ensure_not_expanded stash &&
+	ensure_not_expanded stash list &&
+	ensure_not_expanded stash show stash@{0} &&
+	ensure_not_expanded stash apply stash@{0} &&
+	ensure_not_expanded stash drop stash@{0} &&
+
+	echo >>sparse-index/deep/new &&
+	ensure_not_expanded stash -u &&
+	(
+		WITHOUT_UNTRACKED_TXT=1 &&
+		ensure_not_expanded stash pop
+	) &&
+
+	ensure_not_expanded stash create &&
+	oid=$(git -C sparse-index stash create) &&
+	ensure_not_expanded stash store -m "test" $oid &&
+	ensure_not_expanded reset --hard &&
+	ensure_not_expanded stash pop
+'
+
+test_expect_success 'describe tested on all' '
+	init_repos &&
+
+	# Add tag to be read by describe
+
+	run_on_all git tag -a v1.0 -m "Version 1" &&
+	test_all_match git describe --dirty &&
+	run_on_all rm g &&
+	test_all_match git describe --dirty
+'
+
+
+test_expect_success 'sparse-index is not expanded: describe' '
+	init_repos &&
+
+	# Add tag to be read by describe
+
+	git -C sparse-index tag -a v1.0 -m "Version 1" &&
+
+	ensure_not_expanded describe --dirty &&
+	echo "test" >>sparse-index/g &&
+	ensure_not_expanded describe --dirty &&
+	ensure_not_expanded describe
+'
+
+test_expect_success 'sparse index is not expanded: diff' '
+	init_repos &&
+
+	write_script edit-contents <<-\EOF &&
+	echo text >>$1
+	EOF
+
+	# Add file within cone
+	test_sparse_match git sparse-checkout set deep &&
+	run_on_all ../edit-contents deep/testfile &&
+	test_all_match git add deep/testfile &&
+	run_on_all ../edit-contents deep/testfile &&
+
+	test_all_match git diff &&
+	test_all_match git diff --cached &&
+	ensure_not_expanded diff &&
+	ensure_not_expanded diff --cached &&
+
+	# Add file outside cone
+	test_all_match git reset --hard &&
+	run_on_all mkdir newdirectory &&
+	run_on_all ../edit-contents newdirectory/testfile &&
+	test_sparse_match git sparse-checkout set newdirectory &&
+	test_all_match git add newdirectory/testfile &&
+	run_on_all ../edit-contents newdirectory/testfile &&
+	test_sparse_match git sparse-checkout set &&
+
+	test_all_match git diff &&
+	test_all_match git diff --cached &&
+	ensure_not_expanded diff &&
+	ensure_not_expanded diff --cached &&
+
+	# Merge conflict outside cone
+	# The sparse checkout will report a warning that is not in the
+	# full checkout, so we use `run_on_all` instead of
+	# `test_all_match`
+	run_on_all git reset --hard &&
+	test_all_match git checkout merge-left &&
+	test_all_match test_must_fail git merge merge-right &&
+
+	test_all_match git diff &&
+	test_all_match git diff --cached &&
+	ensure_not_expanded diff &&
+	ensure_not_expanded diff --cached
+'
+
+test_expect_success 'sparse index is not expanded: show and rev-parse' '
+	init_repos &&
+
+	ensure_not_expanded show :a &&
+	ensure_not_expanded show :deep/a &&
+	ensure_not_expanded rev-parse :a &&
+	ensure_not_expanded rev-parse :deep/a
+'
+
+test_expect_success 'sparse index is not expanded: update-index' '
+	init_repos &&
+
+	deep_a_oid=$(git -C full-checkout rev-parse update-deep:deep/a) &&
+	ensure_not_expanded update-index --cacheinfo 100644 $deep_a_oid deep/a &&
+
+	echo "test" >sparse-index/README.md &&
+	echo "test2" >sparse-index/a &&
+	rm -f sparse-index/deep/a &&
+
+	ensure_not_expanded update-index --add README.md &&
+	ensure_not_expanded update-index a &&
+	ensure_not_expanded update-index --remove deep/a &&
+
+	ensure_not_expanded reset --soft update-deep &&
+	ensure_not_expanded update-index --add --remove --again
+'
+
+test_expect_success 'sparse index is not expanded: blame' '
+	init_repos &&
+
+	for file in a \
+			deep/a \
+			deep/deeper1/a \
+			deep/deeper1/deepest/a
+	do
+		ensure_not_expanded blame $file || return 1
+	done
+'
+
+test_expect_success 'sparse index is not expanded: fetch/pull' '
+	init_repos &&
+
+	git -C sparse-index remote add full "file://$(pwd)/full-checkout" &&
+	ensure_not_expanded fetch full &&
+	git -C full-checkout commit --allow-empty -m "for pull merge" &&
+	git -C sparse-index commit --allow-empty -m "for pull merge" &&
+	ensure_not_expanded pull full base
+'
+
+test_expect_success 'sparse index is not expanded: read-tree' '
+	init_repos &&
+
+	ensure_not_expanded checkout -b test-branch update-folder1 &&
+	for MERGE_TREES in "base HEAD update-folder2" \
+			   "base HEAD rename-base" \
+			   "base update-folder2" \
+			   "base rename-base" \
+			   "update-folder2"
+	do
+		ensure_not_expanded read-tree -mu $MERGE_TREES &&
+		ensure_not_expanded reset --hard || return 1
+	done &&
+
+	rm -rf sparse-index/deep/deeper2 &&
+	ensure_not_expanded add . &&
+	ensure_not_expanded commit -m "test" &&
+
+	ensure_not_expanded read-tree --prefix=deep/deeper2 -u deepest
+'
+
+test_expect_success 'ls-files' '
+	init_repos &&
+
+	# Use a smaller sparse-checkout for reduced output
+	test_sparse_match git sparse-checkout set &&
+
+	# Behavior agrees by default. Sparse index is expanded.
+	test_all_match git ls-files &&
+
+	# With --sparse, the sparse index data changes behavior.
+	git -C sparse-index ls-files --sparse >actual &&
+
+	cat >expect <<-\EOF &&
+	a
+	before/
+	deep/
+	e
+	folder1-
+	folder1.x
+	folder1/
+	folder10
+	folder2/
+	g
+	x/
+	z
+	EOF
+
+	test_cmp expect actual &&
+
+	# With --sparse and no sparse index, nothing changes.
+	git -C sparse-checkout ls-files >dense &&
+	git -C sparse-checkout ls-files --sparse >sparse &&
+	test_cmp dense sparse &&
+
+	# Set up a strange condition of having a file edit
+	# outside of the sparse-checkout cone. We want to verify
+	# that all modes handle this the same, and detect the
+	# modification.
+	write_script edit-content <<-\EOF &&
+	mkdir -p folder1 &&
+	echo content >>folder1/a
+	EOF
+	run_on_all ../edit-content &&
+
+	test_all_match git ls-files --modified &&
+
+	git -C sparse-index ls-files --sparse --modified >sparse-index-out &&
+	cat >expect <<-\EOF &&
+	folder1/a
+	EOF
+	test_cmp expect sparse-index-out &&
+
+	# Add folder1 to the sparse-checkout cone and
+	# check that ls-files shows the expanded files.
+	test_sparse_match git sparse-checkout add folder1 &&
+	test_all_match git ls-files --modified &&
+
+	test_all_match git ls-files &&
+	git -C sparse-index ls-files --sparse >actual &&
+
+	cat >expect <<-\EOF &&
+	a
+	before/
+	deep/
+	e
+	folder1-
+	folder1.x
+	folder1/0/0/0
+	folder1/0/1
+	folder1/a
+	folder10
+	folder2/
+	g
+	x/
+	z
+	EOF
+
+	test_cmp expect actual &&
+
+	# Double-check index expansion is avoided
+	ensure_not_expanded ls-files --sparse
+'
+
+test_expect_success 'sparse index is not expanded: sparse-checkout' '
+	init_repos &&
+
+	ensure_not_expanded sparse-checkout set deep/deeper2 &&
+	ensure_not_expanded sparse-checkout set deep/deeper1 &&
+	ensure_not_expanded sparse-checkout set deep &&
+	ensure_not_expanded sparse-checkout add folder1 &&
+	ensure_not_expanded sparse-checkout set deep/deeper1 &&
+	ensure_not_expanded sparse-checkout set folder2 &&
+
+	# Demonstrate that the checks that "folder1/a" is a file
+	# do not cause a sparse-index expansion (since it is in the
+	# sparse-checkout cone).
+	echo >>sparse-index/folder2/a &&
+	git -C sparse-index add folder2/a &&
+
+	ensure_not_expanded sparse-checkout add folder1 &&
+
+	# Skip checks here, since deep/deeper1 is inside a sparse directory
+	# that must be expanded to check whether `deep/deeper1` is a file
+	# or not.
+	ensure_not_expanded sparse-checkout set --skip-checks deep/deeper1 &&
+	ensure_not_expanded sparse-checkout set
+'
+
+# NEEDSWORK: a sparse-checkout behaves differently from a full checkout
+# in this scenario, but it shouldn't.
+test_expect_success 'reset mixed and checkout orphan' '
+	init_repos &&
+
+	test_all_match git checkout rename-out-to-in &&
+
+	# Sparse checkouts do not agree with full checkouts about
+	# how to report a directory/file conflict during a reset.
+	# This command would fail with test_all_match because the
+	# full checkout reports "T folder1/0/1" while a sparse
+	# checkout reports "D folder1/0/1". This matches because
+	# the sparse checkouts skip "adding" the other side of
+	# the conflict.
+	test_sparse_match git reset --mixed HEAD~1 &&
+	test_sparse_match git ls-files --stage &&
+	test_sparse_match git status --porcelain=v2 &&
+
+	# At this point, sparse-checkouts behave differently
+	# from the full-checkout.
+	test_sparse_match git checkout --orphan new-branch &&
+	test_sparse_match git ls-files --stage &&
+	test_sparse_match git status --porcelain=v2
+'
+
+test_expect_success 'add everything with deep new file' '
+	init_repos &&
+
+	run_on_sparse git sparse-checkout set deep/deeper1/deepest &&
+
+	run_on_all touch deep/deeper1/x &&
+	test_all_match git add . &&
+	test_all_match git status --porcelain=v2
+'
+
+# NEEDSWORK: 'git checkout' behaves incorrectly in the case of
+# directory/file conflicts, even without sparse-checkout. Use this
+# test only as a documentation of the incorrect behavior, not a
+# measure of how it _should_ behave.
+test_expect_success 'checkout behaves oddly with df-conflict-1' '
+	init_repos &&
+
+	test_sparse_match git sparse-checkout disable &&
+
+	write_script edit-content <<-\EOF &&
+	echo content >>folder1/larger-content
+	git add folder1
+	EOF
+
+	run_on_all ../edit-content &&
+	test_all_match git status --porcelain=v2 &&
+
+	git -C sparse-checkout sparse-checkout init --cone &&
+	git -C sparse-index sparse-checkout init --cone --sparse-index &&
+
+	test_all_match git status --porcelain=v2 &&
+
+	# This checkout command should fail, because we have a staged
+	# change to folder1/larger-content, but the destination changes
+	# folder1 to a file.
+	git -C full-checkout checkout df-conflict-1 \
+		1>full-checkout-out \
+		2>full-checkout-err &&
+	git -C sparse-checkout checkout df-conflict-1 \
+		1>sparse-checkout-out \
+		2>sparse-checkout-err &&
+	git -C sparse-index checkout df-conflict-1 \
+		1>sparse-index-out \
+		2>sparse-index-err &&
+
+	# Instead, the checkout deletes the folder1 file and adds the
+	# folder1/larger-content file, leaving all other paths that were
+	# in folder1/ as deleted (without any warning).
+	cat >expect <<-EOF &&
+	D	folder1
+	A	folder1/larger-content
+	EOF
+	test_cmp expect full-checkout-out &&
+	test_cmp expect sparse-checkout-out &&
+
+	# The sparse-index reports no output
+	test_must_be_empty sparse-index-out &&
+
+	# stderr: Switched to branch df-conflict-1
+	test_cmp full-checkout-err sparse-checkout-err &&
+	test_cmp full-checkout-err sparse-checkout-err
+'
+
+# NEEDSWORK: 'git checkout' behaves incorrectly in the case of
+# directory/file conflicts, even without sparse-checkout. Use this
+# test only as a documentation of the incorrect behavior, not a
+# measure of how it _should_ behave.
+test_expect_success 'checkout behaves oddly with df-conflict-2' '
+	init_repos &&
+
+	test_sparse_match git sparse-checkout disable &&
+
+	write_script edit-content <<-\EOF &&
+	echo content >>folder2/larger-content
+	git add folder2
+	EOF
+
+	run_on_all ../edit-content &&
+	test_all_match git status --porcelain=v2 &&
+
+	git -C sparse-checkout sparse-checkout init --cone &&
+	git -C sparse-index sparse-checkout init --cone --sparse-index &&
+
+	test_all_match git status --porcelain=v2 &&
+
+	# This checkout command should fail, because we have a staged
+	# change to folder1/larger-content, but the destination changes
+	# folder1 to a file.
+	git -C full-checkout checkout df-conflict-2 \
+		1>full-checkout-out \
+		2>full-checkout-err &&
+	git -C sparse-checkout checkout df-conflict-2 \
+		1>sparse-checkout-out \
+		2>sparse-checkout-err &&
+	git -C sparse-index checkout df-conflict-2 \
+		1>sparse-index-out \
+		2>sparse-index-err &&
+
+	# The full checkout deviates from the df-conflict-1 case here!
+	# It drops the change to folder1/larger-content and leaves the
+	# folder1 path as-is on disk. The sparse-index behaves the same.
+	test_must_be_empty full-checkout-out &&
+	test_must_be_empty sparse-index-out &&
+
+	# In the sparse-checkout case, the checkout deletes the folder1
+	# file and adds the folder1/larger-content file, leaving all other
+	# paths that were in folder1/ as deleted (without any warning).
+	cat >expect <<-EOF &&
+	D	folder2
+	A	folder2/larger-content
+	EOF
+	test_cmp expect sparse-checkout-out &&
+
+	# Switched to branch df-conflict-1
+	test_cmp full-checkout-err sparse-checkout-err &&
+	test_cmp full-checkout-err sparse-index-err
+'
+
+test_expect_success 'mv directory from out-of-cone to in-cone' '
+	init_repos &&
+
+	# <source> as a sparse directory (or SKIP_WORKTREE_DIR without enabling
+	# sparse index).
+	test_all_match git mv --sparse folder1 deep &&
+	test_all_match git status --porcelain=v2 &&
+	test_sparse_match git ls-files -t &&
+	git -C sparse-checkout ls-files -t >actual &&
+	grep -e "H deep/folder1/0/0/0" actual &&
+	grep -e "H deep/folder1/0/1" actual &&
+	grep -e "H deep/folder1/a" actual &&
+
+	test_all_match git reset --hard &&
+
+	# <source> as a directory deeper than sparse index boundary (where
+	# sparse index will expand).
+	test_sparse_match git mv --sparse folder1/0 deep &&
+	test_sparse_match git status --porcelain=v2 &&
+	test_sparse_match git ls-files -t &&
+	git -C sparse-checkout ls-files -t >actual &&
+	grep -e "H deep/0/0/0" actual &&
+	grep -e "H deep/0/1" actual
+'
+
+test_expect_success 'rm pathspec inside sparse definition' '
+	init_repos &&
+
+	test_all_match git rm deep/a &&
+	test_all_match git status --porcelain=v2 &&
+
+	# test wildcard
+	run_on_all git reset --hard &&
+	test_all_match git rm deep/* &&
+	test_all_match git status --porcelain=v2 &&
+
+	# test recursive rm
+	run_on_all git reset --hard &&
+	test_all_match git rm -r deep &&
+	test_all_match git status --porcelain=v2
+'
+
+test_expect_success 'rm pathspec outside sparse definition' '
+	init_repos &&
+
+	for file in folder1/a folder1/0/1
+	do
+		test_sparse_match test_must_fail git rm $file &&
+		test_sparse_match test_must_fail git rm --cached $file &&
+		test_sparse_match git rm --sparse $file &&
+		test_sparse_match git status --porcelain=v2 || return 1
+	done &&
+
+	cat >folder1-full <<-EOF &&
+	rm ${SQ}folder1/0/0/0${SQ}
+	rm ${SQ}folder1/0/1${SQ}
+	rm ${SQ}folder1/a${SQ}
+	EOF
+
+	cat >folder1-sparse <<-EOF &&
+	rm ${SQ}folder1/${SQ}
+	EOF
+
+	# test wildcard
+	run_on_sparse git reset --hard &&
+	run_on_sparse git sparse-checkout reapply &&
+	test_sparse_match test_must_fail git rm folder1/* &&
+	run_on_sparse git rm --sparse folder1/* &&
+	test_cmp folder1-full sparse-checkout-out &&
+	test_cmp folder1-sparse sparse-index-out &&
+	test_sparse_match git status --porcelain=v2 &&
+
+	# test recursive rm
+	run_on_sparse git reset --hard &&
+	run_on_sparse git sparse-checkout reapply &&
+	test_sparse_match test_must_fail git rm --sparse folder1 &&
+	run_on_sparse git rm --sparse -r folder1 &&
+	test_cmp folder1-full sparse-checkout-out &&
+	test_cmp folder1-sparse sparse-index-out &&
+	test_sparse_match git status --porcelain=v2
+'
+
+test_expect_success 'rm pathspec expands index when necessary' '
+	init_repos &&
+
+	# in-cone pathspec (do not expand)
+	ensure_not_expanded rm "deep/deep*" &&
+	test_must_be_empty sparse-index-err &&
+
+	# out-of-cone pathspec (expand)
+	! ensure_not_expanded rm --sparse "folder1/a*" &&
+	test_must_be_empty sparse-index-err &&
+
+	# pathspec that should expand index
+	! ensure_not_expanded rm "*/a" &&
+	test_must_be_empty sparse-index-err &&
+
+	! ensure_not_expanded rm "**a" &&
+	test_must_be_empty sparse-index-err
+'
+
+test_expect_success 'sparse index is not expanded: rm' '
+	init_repos &&
+
+	ensure_not_expanded rm deep/a &&
+
+	# test in-cone wildcard
+	git -C sparse-index reset --hard &&
+	ensure_not_expanded rm deep/* &&
+
+	# test recursive rm
+	git -C sparse-index reset --hard &&
+	ensure_not_expanded rm -r deep
+'
+
+test_expect_success 'grep with and --cached' '
+	init_repos &&
+
+	test_all_match git grep --cached a &&
+	test_all_match git grep --cached a -- "folder1/*"
+'
+
+test_expect_success 'grep is not expanded' '
+	init_repos &&
+
+	ensure_not_expanded grep a &&
+	ensure_not_expanded grep a -- deep/* &&
+
+	# All files within the folder1/* pathspec are sparse,
+	# so this command does not find any matches
+	ensure_not_expanded ! grep a -- folder1/* &&
+
+	# test out-of-cone pathspec with or without wildcard
+	ensure_not_expanded grep --cached a -- "folder1/a" &&
+	ensure_not_expanded grep --cached a -- "folder1/*" &&
+
+	# test in-cone pathspec with or without wildcard
+	ensure_not_expanded grep --cached a -- "deep/a" &&
+	ensure_not_expanded grep --cached a -- "deep/*"
+'
+
+# NEEDSWORK: when running `grep` in the superproject with --recurse-submodules,
+# Git expands the index of the submodules unexpectedly. Even though `grep`
+# builtin is marked as "command_requires_full_index = 0", this config is only
+# useful for the superproject. Namely, the submodules have their own configs,
+# which are _not_ populated by the one-time sparse-index feature switch.
+test_expect_failure 'grep within submodules is not expanded' '
+	init_repos_as_submodules &&
+
+	# do not use ensure_not_expanded() here, becasue `grep` should be
+	# run in the superproject, not in "./sparse-index"
+	GIT_TRACE2_EVENT="$(pwd)/trace2.txt" \
+	git grep --cached --recurse-submodules a -- "*/folder1/*" &&
+	test_region ! index ensure_full_index trace2.txt
+'
+
+# NEEDSWORK: this test is not actually testing the code. The design purpose
+# of this test is to verify the grep result when the submodules are using a
+# sparse-index. Namely, we want "folder1/" as a tree (a sparse directory); but
+# because of the index expansion, we are now grepping the "folder1/a" blob.
+# Because of the problem stated above 'grep within submodules is not expanded',
+# we don't have the ideal test environment yet.
+test_expect_success 'grep sparse directory within submodules' '
+	init_repos_as_submodules &&
+
+	cat >expect <<-\EOF &&
+	full-checkout/folder1/a:a
+	sparse-checkout/folder1/a:a
+	sparse-index/folder1/a:a
+	EOF
+	git grep --cached --recurse-submodules a -- "*/folder1/*" >actual &&
+	test_cmp actual expect
+'
+
+test_expect_success 'write-tree' '
+	init_repos &&
+
+	test_all_match git write-tree &&
+
+	write_script edit-contents <<-\EOF &&
+	echo text >>"$1"
+	EOF
+
+	# make a change inside the sparse cone
+	run_on_all ../edit-contents deep/a &&
+	test_all_match git update-index deep/a &&
+	test_all_match git write-tree &&
+	test_all_match git status --porcelain=v2 &&
+
+	# make a change outside the sparse cone
+	run_on_all mkdir -p folder1 &&
+	run_on_all cp a folder1/a &&
+	run_on_all ../edit-contents folder1/a &&
+	test_all_match git update-index folder1/a &&
+	test_all_match git write-tree &&
+	test_all_match git status --porcelain=v2 &&
+
+	# check that SKIP_WORKTREE files are not materialized
+	test_path_is_missing sparse-checkout/folder2/a &&
+	test_path_is_missing sparse-index/folder2/a
+'
+
+test_expect_success 'sparse-index is not expanded: write-tree' '
+	init_repos &&
+
+	ensure_not_expanded write-tree &&
+
+	echo "test1" >>sparse-index/a &&
+	git -C sparse-index update-index a &&
+	ensure_not_expanded write-tree
+'
+
+test_expect_success 'diff-files with pathspec inside sparse definition' '
+	init_repos &&
+
+	write_script edit-contents <<-\EOF &&
+	echo text >>"$1"
+	EOF
+
+	run_on_all ../edit-contents deep/a &&
+
+	test_all_match git diff-files &&
+
+	test_all_match git diff-files -- deep/a &&
+
+	# test wildcard
+	test_all_match git diff-files -- "deep/*"
+'
+
+test_expect_success 'diff-files with pathspec outside sparse definition' '
+	init_repos &&
+
+	test_sparse_match git diff-files -- folder2/a &&
+
+	write_script edit-contents <<-\EOF &&
+	echo text >>"$1"
+	EOF
+
+	# The directory "folder1" is outside the cone of interest
+	# and will not exist in the sparse checkout repositories.
+	# Create it as needed, add file "folder1/a" there with
+	# contents that is different from the staged version.
+	run_on_all mkdir -p folder1 &&
+	run_on_all cp a folder1/a &&
+
+	run_on_all ../edit-contents folder1/a &&
+	test_all_match git diff-files &&
+	test_all_match git diff-files -- folder1/a &&
+	test_all_match git diff-files -- "folder*/a"
+'
+
+test_expect_success 'sparse index is not expanded: diff-files' '
+	init_repos &&
+
+	write_script edit-contents <<-\EOF &&
+	echo text >>"$1"
+	EOF
+
+	run_on_all ../edit-contents deep/a &&
+
+	ensure_not_expanded diff-files &&
+	ensure_not_expanded diff-files -- deep/a &&
+	ensure_not_expanded diff-files -- "deep/*"
+'
+
+test_expect_success 'diff-tree' '
+	init_repos &&
+
+	# Test change inside sparse cone
+	tree1=$(git -C sparse-index rev-parse HEAD^{tree}) &&
+	tree2=$(git -C sparse-index rev-parse update-deep^{tree}) &&
+	test_all_match git diff-tree $tree1 $tree2 &&
+	test_all_match git diff-tree $tree1 $tree2 -- deep/a &&
+	test_all_match git diff-tree HEAD update-deep &&
+	test_all_match git diff-tree HEAD update-deep -- deep/a &&
+
+	# Test change outside sparse cone
+	tree3=$(git -C sparse-index rev-parse update-folder1^{tree}) &&
+	test_all_match git diff-tree $tree1 $tree3 &&
+	test_all_match git diff-tree $tree1 $tree3 -- folder1/a &&
+	test_all_match git diff-tree HEAD update-folder1 &&
+	test_all_match git diff-tree HEAD update-folder1 -- folder1/a &&
+
+	# Check that SKIP_WORKTREE files are not materialized
+	test_path_is_missing sparse-checkout/folder1/a &&
+	test_path_is_missing sparse-index/folder1/a &&
+	test_path_is_missing sparse-checkout/folder2/a &&
+	test_path_is_missing sparse-index/folder2/a
+'
+
+test_expect_success 'sparse-index is not expanded: diff-tree' '
+	init_repos &&
+
+	tree1=$(git -C sparse-index rev-parse HEAD^{tree}) &&
+	tree2=$(git -C sparse-index rev-parse update-deep^{tree}) &&
+	tree3=$(git -C sparse-index rev-parse update-folder1^{tree}) &&
+
+	ensure_not_expanded diff-tree $tree1 $tree2 &&
+	ensure_not_expanded diff-tree $tree1 $tree2 -- deep/a &&
+	ensure_not_expanded diff-tree HEAD update-deep &&
+	ensure_not_expanded diff-tree HEAD update-deep -- deep/a &&
+	ensure_not_expanded diff-tree $tree1 $tree3 &&
+	ensure_not_expanded diff-tree $tree1 $tree3 -- folder1/a &&
+	ensure_not_expanded diff-tree HEAD update-folder1 &&
+	ensure_not_expanded diff-tree HEAD update-folder1 -- folder1/a
+'
+
+test_expect_success 'worktree' '
+	init_repos &&
+
+	write_script edit-contents <<-\EOF &&
+	echo text >>"$1"
+	EOF
+
+	for repo in full-checkout sparse-checkout sparse-index
+	do
+		worktree=${repo}-wt &&
+		git -C $repo worktree add ../$worktree &&
+
+		# Compare worktree content with "ls"
+		(cd $repo && ls) >worktree_contents &&
+		(cd $worktree && ls) >new_worktree_contents &&
+		test_cmp worktree_contents new_worktree_contents &&
+
+		# Compare index content with "ls-files --sparse"
+		git -C $repo ls-files --sparse >index_contents &&
+		git -C $worktree ls-files --sparse >new_index_contents &&
+		test_cmp index_contents new_index_contents &&
+
+		git -C $repo worktree remove ../$worktree || return 1
+	done &&
+
+	test_all_match git worktree add .worktrees/hotfix &&
+	run_on_all ../edit-contents .worktrees/hotfix/deep/a &&
+	test_all_match test_must_fail git worktree remove .worktrees/hotfix
+'
+
+test_expect_success 'worktree is not expanded' '
+	init_repos &&
+
+	ensure_not_expanded worktree add .worktrees/hotfix &&
+	ensure_not_expanded worktree remove .worktrees/hotfix
+'
+
+test_expect_success 'check-attr with pathspec inside sparse definition' '
+	init_repos &&
+
+	echo "a -crlf myAttr" >>.gitattributes &&
+	run_on_all cp ../.gitattributes ./deep &&
+
+	test_all_match git check-attr -a -- deep/a &&
+
+	test_all_match git add deep/.gitattributes &&
+	test_all_match git check-attr -a --cached -- deep/a
+'
+
+test_expect_success 'check-attr with pathspec outside sparse definition' '
+	init_repos &&
+
+	echo "a -crlf myAttr" >>.gitattributes &&
+	run_on_sparse mkdir folder1 &&
+	run_on_all cp ../.gitattributes ./folder1 &&
+	run_on_all cp a folder1/a &&
+
+	test_all_match git check-attr -a -- folder1/a &&
+
+	git -C full-checkout add folder1/.gitattributes &&
+	test_sparse_match git add --sparse folder1/.gitattributes &&
+	test_all_match git commit -m "add .gitattributes" &&
+	test_sparse_match git sparse-checkout reapply &&
+	test_all_match git check-attr -a --cached -- folder1/a
+'
+
+# NEEDSWORK: The 'diff --check' test is left as 'test_expect_failure' due
+# to an underlying issue in oneway_diff() within diff-lib.c.
+# 'do_oneway_diff()' is not called as expected for paths that could match
+# inside of a sparse directory. Specifically, the 'ce_path_match()' function
+# fails to recognize files inside a sparse directory (e.g., when 'folder1/'
+# is a sparse directory, 'folder1/a' cannot be recognized). The goal is to
+# proceed with 'do_oneway_diff()' if the pathspec could match inside of a
+# sparse directory.
+test_expect_failure 'diff --check with pathspec outside sparse definition' '
+	init_repos &&
+
+	write_script edit-contents <<-\EOF &&
+	echo "a " >"$1"
+	EOF
+
+	test_all_match git config core.whitespace -trailing-space,-space-before-tab &&
+
+	echo "a whitespace=trailing-space,space-before-tab" >>.gitattributes &&
+	run_on_all mkdir -p folder1 &&
+	run_on_all cp ../.gitattributes ./folder1 &&
+	test_all_match git add --sparse folder1/.gitattributes &&
+	run_on_all ../edit-contents folder1/a &&
+	test_all_match git add --sparse folder1/a &&
+
+	test_sparse_match git sparse-checkout reapply &&
+	test_all_match test_must_fail git diff --check --cached -- folder1/a
+'
+
+test_expect_success 'sparse-index is not expanded: check-attr' '
+	init_repos &&
+
+	echo "a -crlf myAttr" >>.gitattributes &&
+	mkdir ./sparse-index/folder1 &&
+	cp ./sparse-index/a ./sparse-index/folder1/a &&
+	cp .gitattributes ./sparse-index/deep &&
+	cp .gitattributes ./sparse-index/folder1 &&
+
+	git -C sparse-index add deep/.gitattributes &&
+	git -C sparse-index add --sparse folder1/.gitattributes &&
+	ensure_not_expanded check-attr -a --cached -- deep/a &&
+	ensure_not_expanded check-attr -a --cached -- folder1/a
+'
+
+test_done
diff --git a/t/t1100-commit-tree-options.sh b/t/t1100-commit-tree-options.sh
index ae66ba5..0f37a43 100755
--- a/t/t1100-commit-tree-options.sh
+++ b/t/t1100-commit-tree-options.sh
@@ -12,6 +12,7 @@ Also make sure that command line parser understands the normal
 "flags first and then non flag arguments" command line.
 '
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 cat >expected <<EOF
diff --git a/t/t1300-config.sh b/t/t1300-config.sh
index 97ebfe1..9b65d9e 100755
--- a/t/t1300-config.sh
+++ b/t/t1300-config.sh
@@ -5,82 +5,196 @@
 
 test_description='Test git config in different settings'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
+test_expect_success 'setup whitespace config' '
+	sed -e "s/^|//" \
+	    -e "s/[$]$//" \
+	    -e "s/X/	/g" >.git/config <<-\EOF
+	[section]
+	|	solid = rock
+	|	sparse = big XX blue
+	|	sparseAndTail = big XX blue $
+	|	sparseAndTailQuoted = "big XX blue "
+	|	sparseAndBiggerTail = big XX blue X X
+	|	sparseAndBiggerTailQuoted = "big XX blue X X"
+	|	sparseAndBiggerTailQuotedPlus = "big XX blue X X"X $
+	|	headAndTail = Xbig blue $
+	|	headAndTailQuoted = "Xbig blue "
+	|	headAndTailQuotedPlus = "Xbig blue " $
+	|	annotated = big blueX# to be discarded
+	|	annotatedQuoted = "big blue"X# to be discarded
+	EOF
+'
+
+test_expect_success 'no internal whitespace' '
+	echo "rock" >expect &&
+	git config --get section.solid >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'internal whitespace' '
+	echo "big QQ blue" | q_to_tab >expect &&
+	git config --get section.sparse >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'internal and trailing whitespace' '
+	echo "big QQ blue" | q_to_tab >expect &&
+	git config --get section.sparseAndTail >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'internal and trailing whitespace, all quoted' '
+	echo "big QQ blue " | q_to_tab >expect &&
+	git config --get section.sparseAndTailQuoted >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'internal and more trailing whitespace' '
+	echo "big QQ blue" | q_to_tab >expect &&
+	git config --get section.sparseAndBiggerTail >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'internal and more trailing whitespace, all quoted' '
+	echo "big QQ blue Q Q" | q_to_tab >expect &&
+	git config --get section.sparseAndBiggerTailQuoted >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'internal and more trailing whitespace, not all quoted' '
+	echo "big QQ blue Q Q" | q_to_tab >expect &&
+	git config --get section.sparseAndBiggerTailQuotedPlus >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'leading and trailing whitespace' '
+	echo "big blue" >expect &&
+	git config --get section.headAndTail >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'leading and trailing whitespace, all quoted' '
+	echo "Qbig blue " | q_to_tab >expect &&
+	git config --get section.headAndTailQuoted >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'leading and trailing whitespace, not all quoted' '
+	echo "Qbig blue " | q_to_tab >expect &&
+	git config --get section.headAndTailQuotedPlus >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'inline comment' '
+	echo "big blue" >expect &&
+	git config --get section.annotated >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'inline comment, quoted' '
+	echo "big blue" >expect &&
+	git config --get section.annotatedQuoted >actual &&
+	test_cmp expect actual
+'
+
 test_expect_success 'clear default config' '
 	rm -f .git/config
 '
 
 cat > expect << EOF
-[core]
+[section]
 	penguin = little blue
 EOF
 test_expect_success 'initial' '
-	git config core.penguin "little blue" &&
+	git config section.penguin "little blue" &&
 	test_cmp expect .git/config
 '
 
 cat > expect << EOF
-[core]
+[section]
 	penguin = little blue
 	Movie = BadPhysics
 EOF
 test_expect_success 'mixed case' '
-	git config Core.Movie BadPhysics &&
+	git config Section.Movie BadPhysics &&
 	test_cmp expect .git/config
 '
 
 cat > expect << EOF
-[core]
+[section]
 	penguin = little blue
 	Movie = BadPhysics
-[Cores]
+[Sections]
 	WhatEver = Second
 EOF
 test_expect_success 'similar section' '
-	git config Cores.WhatEver Second &&
+	git config Sections.WhatEver Second &&
 	test_cmp expect .git/config
 '
 
 cat > expect << EOF
-[core]
+[section]
 	penguin = little blue
 	Movie = BadPhysics
 	UPPERCASE = true
-[Cores]
+[Sections]
 	WhatEver = Second
 EOF
 test_expect_success 'uppercase section' '
-	git config CORE.UPPERCASE true &&
+	git config SECTION.UPPERCASE true &&
 	test_cmp expect .git/config
 '
 
 test_expect_success 'replace with non-match' '
-	git config core.penguin kingpin !blue
+	git config section.penguin kingpin !blue
 '
 
 test_expect_success 'replace with non-match (actually matching)' '
-	git config core.penguin "very blue" !kingpin
+	git config section.penguin "very blue" !kingpin
 '
 
 cat > expect << EOF
-[core]
-	penguin = very blue
+[section]
 	Movie = BadPhysics
 	UPPERCASE = true
-	penguin = kingpin
-[Cores]
+	penguin = gentoo # Pygoscelis papua
+	disposition = peckish # find fish
+	foo = bar #abc
+	spsp = value # and comment
+	htsp = value	# and comment
+[Sections]
 	WhatEver = Second
 EOF
 
+test_expect_success 'append comments' '
+	git config --replace-all --comment="Pygoscelis papua" section.penguin gentoo &&
+	git config --comment="find fish" section.disposition peckish &&
+	git config --comment="#abc" section.foo bar &&
+
+	git config --comment="and comment" section.spsp value &&
+	git config --comment="	# and comment" section.htsp value &&
+
+	test_cmp expect .git/config
+'
+
+test_expect_success 'Prohibited LF in comment' '
+	test_must_fail git config --comment="a${LF}b" section.k v
+'
+
 test_expect_success 'non-match result' 'test_cmp expect .git/config'
 
 test_expect_success 'find mixed-case key by canonical name' '
-	test_cmp_config Second cores.whatever
+	test_cmp_config Second sections.whatever
 '
 
 test_expect_success 'find mixed-case key by non-canonical name' '
-	test_cmp_config Second CoReS.WhAtEvEr
+	test_cmp_config Second SeCtIoNs.WhAtEvEr
 '
 
 test_expect_success 'subsections are not canonicalized by git-config' '
@@ -94,6 +208,23 @@ test_expect_success 'subsections are not canonicalized by git-config' '
 	test_cmp_config two section.SubSection.key
 '
 
+test_missing_key () {
+	local key="$1" &&
+	local title="$2" &&
+	test_expect_success "value for $title is not printed" '
+		test_must_fail git config "$key" >out 2>err &&
+		test_must_be_empty out &&
+		test_must_be_empty err
+	'
+}
+
+test_missing_key 'missingsection.missingkey' 'missing section and missing key'
+test_missing_key 'missingsection.penguin' 'missing section and existing key'
+test_missing_key 'section.missingkey' 'existing section and missing key'
+test_missing_key 'section.MissingSubSection.missingkey' 'missing subsection and missing key'
+test_missing_key 'section.SubSection.missingkey' 'existing subsection and missing key'
+test_missing_key 'section.MissingSubSection.key' 'missing subsection and existing key'
+
 cat > .git/config <<\EOF
 [alpha]
 bar = foo
@@ -432,7 +563,7 @@ test_expect_success 'get bool variable with empty value' '
 
 test_expect_success 'no arguments, but no crash' '
 	test_must_fail git config >output 2>&1 &&
-	test_i18ngrep usage output
+	test_grep usage output
 '
 
 cat > .git/config << EOF
@@ -469,7 +600,8 @@ test_expect_success 'new variable inserts into proper section' '
 '
 
 test_expect_success 'alternative --file (non-existing file should fail)' '
-	test_must_fail git config --file non-existing-config -l
+	test_must_fail git config --file non-existing-config -l &&
+	test_must_fail git config --file non-existing-config test.xyzzy
 '
 
 cat > other-config << EOF
@@ -506,10 +638,6 @@ test_expect_success 'editing stdin is an error' '
 
 test_expect_success 'refer config from subdirectory' '
 	mkdir x &&
-	test_cmp_config -C x strasse --get --file ../other-config ein.bahn
-'
-
-test_expect_success 'refer config from subdirectory via --file' '
 	test_cmp_config -C x strasse --file=../other-config --get ein.bahn
 '
 
@@ -616,6 +744,36 @@ test_expect_success 'renaming to bogus section is rejected' '
 	test_must_fail git config --rename-section branch.zwei "bogus name"
 '
 
+test_expect_success 'renaming a section with a long line' '
+	{
+		printf "[b]\\n" &&
+		printf "  c = d %1024s [a] e = f\\n" " " &&
+		printf "[a] g = h\\n"
+	} >y &&
+	git config -f y --rename-section a xyz &&
+	test_must_fail git config -f y b.e
+'
+
+test_expect_success 'renaming an embedded section with a long line' '
+	{
+		printf "[b]\\n" &&
+		printf "  c = d %1024s [a] [foo] e = f\\n" " " &&
+		printf "[a] g = h\\n"
+	} >y &&
+	git config -f y --rename-section a xyz &&
+	test_must_fail git config -f y foo.e
+'
+
+test_expect_success 'renaming a section with an overly-long line' '
+	{
+		printf "[b]\\n" &&
+		printf "  c = d %525000s e" " " &&
+		printf "[a] g = h\\n"
+	} >y &&
+	test_must_fail git config -f y --rename-section a xyz 2>err &&
+	grep "refusing to work with overly long line in .y. on line 2" err
+'
+
 cat >> .git/config << EOF
   [branch "zwei"] a = 1 [branch "vier"]
 EOF
@@ -672,18 +830,25 @@ test_expect_success 'invalid unit' '
 	git config aninvalid.unit "1auto" &&
 	test_cmp_config 1auto aninvalid.unit &&
 	test_must_fail git config --int --get aninvalid.unit 2>actual &&
-	test_i18ngrep "bad numeric config value .1auto. for .aninvalid.unit. in file .git/config: invalid unit" actual
+	test_grep "bad numeric config value .1auto. for .aninvalid.unit. in file .git/config: invalid unit" actual
+'
+
+test_expect_success 'invalid unit boolean' '
+	git config commit.gpgsign "1true" &&
+	test_cmp_config 1true commit.gpgsign &&
+	test_must_fail git config --bool --get commit.gpgsign 2>actual &&
+	test_grep "bad boolean config value .1true. for .commit.gpgsign." actual
 '
 
 test_expect_success 'line number is reported correctly' '
 	printf "[bool]\n\tvar\n" >invalid &&
 	test_must_fail git config -f invalid --path bool.var 2>actual &&
-	test_i18ngrep "line 2" actual
+	test_grep "line 2" actual
 '
 
 test_expect_success 'invalid stdin config' '
 	echo "[broken" | test_must_fail git config --list --file - >output 2>&1 &&
-	test_i18ngrep "bad config line 1 in standard input" output
+	test_grep "bad config line 1 in standard input" output
 '
 
 cat > expect << EOF
@@ -710,8 +875,8 @@ test_expect_success bool '
 	rm -f result &&
 	for i in 1 2 3 4
 	do
-	    git config --bool --get bool.true$i >>result
-	    git config --bool --get bool.false$i >>result
+	    git config --bool --get bool.true$i >>result &&
+	    git config --bool --get bool.false$i >>result || return 1
 	done &&
 	test_cmp expect result'
 
@@ -864,7 +1029,7 @@ test_expect_success !MINGW 'get --path copes with unset $HOME' '
 		git config --get --path path.normal >>result &&
 		git config --get --path path.trailingtilde >>result
 	) &&
-	test_i18ngrep "[Ff]ailed to expand.*~/" msg &&
+	test_grep "[Ff]ailed to expand.*~/" msg &&
 	test_cmp expect result
 '
 
@@ -894,7 +1059,7 @@ test_expect_success 'get --expiry-date' '
 	EOF
 	: "work around heredoc parsing bug fixed in dash 0.5.7 (in ec2c84d)" &&
 	{
-		echo "$rel_out $(git config --expiry-date date.valid1)"
+		echo "$rel_out $(git config --expiry-date date.valid1)" &&
 		git config --expiry-date date.valid2 &&
 		git config --expiry-date date.valid3 &&
 		git config --expiry-date date.valid4 &&
@@ -931,7 +1096,7 @@ test_expect_success 'get --type=color barfs on non-color' '
 
 test_expect_success 'set --type=color barfs on non-color' '
 	test_must_fail git config --type=color foo.color "not-a-color" 2>error &&
-	test_i18ngrep "cannot parse color" error
+	test_grep "cannot parse color" error
 '
 
 cat > expect << EOF
@@ -1011,9 +1176,25 @@ test_expect_success '--null --get-regexp' '
 	test_cmp expect result
 '
 
-test_expect_success 'inner whitespace kept verbatim' '
-	git config section.val "foo 	  bar" &&
-	test_cmp_config "foo 	  bar" section.val
+test_expect_success 'inner whitespace kept verbatim, spaces only' '
+	echo "foo   bar" >expect &&
+	git config section.val "foo   bar" &&
+	git config --get section.val >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'inner whitespace kept verbatim, horizontal tabs only' '
+	echo "fooQQbar" | q_to_tab >expect &&
+	git config section.val "$(cat expect)" &&
+	git config --get section.val >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'inner whitespace kept verbatim, horizontal tabs and spaces' '
+	echo "foo Q  bar" | q_to_tab >expect &&
+	git config section.val "$(cat expect)" &&
+	git config --get section.val >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success SYMLINKS 'symlinked configuration' '
@@ -1036,11 +1217,6 @@ test_expect_success SYMLINKS 'symlinked configuration' '
 	test_cmp expect actual
 '
 
-test_expect_success 'nonexistent configuration' '
-	test_must_fail git config --file=doesnotexist --list &&
-	test_must_fail git config --file=doesnotexist test.xyzzy
-'
-
 test_expect_success SYMLINKS 'symlink to nonexistent configuration' '
 	ln -s doesnotexist linktonada &&
 	ln -s linktonada linktolinktonada &&
@@ -1048,15 +1224,20 @@ test_expect_success SYMLINKS 'symlink to nonexistent configuration' '
 	test_must_fail git config --file=linktolinktonada --list
 '
 
-test_expect_success 'check split_cmdline return' "
-	git config alias.split-cmdline-fix 'echo \"' &&
-	test_must_fail git split-cmdline-fix &&
-	echo foo > foo &&
-	git add foo &&
-	git commit -m 'initial commit' &&
-	git config branch.master.mergeoptions 'echo \"' &&
-	test_must_fail git merge master
-"
+test_expect_success 'check split_cmdline return' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	(
+		cd repo &&
+		git config alias.split-cmdline-fix "echo \"" &&
+		test_must_fail git split-cmdline-fix &&
+		echo foo >foo &&
+		git add foo &&
+		git commit -m "initial commit" &&
+		git config branch.main.mergeoptions "echo \"" &&
+		test_must_fail git merge main
+	)
+'
 
 test_expect_success 'git -c "key=value" support' '
 	cat >expect <<-\EOF &&
@@ -1065,12 +1246,12 @@ test_expect_success 'git -c "key=value" support' '
 	true
 	EOF
 	{
-		git -c core.name=value config core.name &&
+		git -c section.name=value config section.name &&
 		git -c foo.CamelCase=value config foo.camelcase &&
 		git -c foo.flag config --bool foo.flag
 	} >actual &&
 	test_cmp expect actual &&
-	test_must_fail git -c name=value config core.name
+	test_must_fail git -c name=value config section.name
 '
 
 # We just need a type-specifier here that cares about the
@@ -1107,15 +1288,21 @@ test_expect_success 'git -c works with aliases of builtins' '
 '
 
 test_expect_success 'aliases can be CamelCased' '
-	test_config alias.CamelCased "rev-parse HEAD" &&
-	git CamelCased >out &&
-	git rev-parse HEAD >expect &&
-	test_cmp expect out
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	(
+		cd repo &&
+		test_commit A &&
+		git config alias.CamelCased "rev-parse HEAD" &&
+		git CamelCased >out &&
+		git rev-parse HEAD >expect &&
+		test_cmp expect out
+	)
 '
 
 test_expect_success 'git -c does not split values on equals' '
 	echo "value with = in it" >expect &&
-	git -c core.foo="value with = in it" config core.foo >actual &&
+	git -c section.foo="value with = in it" config section.foo >actual &&
 	test_cmp expect actual
 '
 
@@ -1294,6 +1481,58 @@ test_expect_success 'git -c is not confused by empty environment' '
 	GIT_CONFIG_PARAMETERS="" git -c x.one=1 config --list
 '
 
+test_expect_success 'GIT_CONFIG_PARAMETERS handles old-style entries' '
+	v="${SQ}key.one=foo${SQ}" &&
+	v="$v  ${SQ}key.two=bar${SQ}" &&
+	v="$v ${SQ}key.ambiguous=section.whatever=value${SQ}" &&
+	GIT_CONFIG_PARAMETERS=$v git config --get-regexp "key.*" >actual &&
+	cat >expect <<-EOF &&
+	key.one foo
+	key.two bar
+	key.ambiguous section.whatever=value
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'GIT_CONFIG_PARAMETERS handles new-style entries' '
+	v="${SQ}key.one${SQ}=${SQ}foo${SQ}" &&
+	v="$v  ${SQ}key.two${SQ}=${SQ}bar${SQ}" &&
+	v="$v ${SQ}key.ambiguous=section.whatever${SQ}=${SQ}value${SQ}" &&
+	GIT_CONFIG_PARAMETERS=$v git config --get-regexp "key.*" >actual &&
+	cat >expect <<-EOF &&
+	key.one foo
+	key.two bar
+	key.ambiguous=section.whatever value
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'old and new-style entries can mix' '
+	v="${SQ}key.oldone=oldfoo${SQ}" &&
+	v="$v ${SQ}key.newone${SQ}=${SQ}newfoo${SQ}" &&
+	v="$v ${SQ}key.oldtwo=oldbar${SQ}" &&
+	v="$v ${SQ}key.newtwo${SQ}=${SQ}newbar${SQ}" &&
+	GIT_CONFIG_PARAMETERS=$v git config --get-regexp "key.*" >actual &&
+	cat >expect <<-EOF &&
+	key.oldone oldfoo
+	key.newone newfoo
+	key.oldtwo oldbar
+	key.newtwo newbar
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'old and new bools with ambiguous subsection' '
+	v="${SQ}key.with=equals.oldbool${SQ}" &&
+	v="$v ${SQ}key.with=equals.newbool${SQ}=" &&
+	GIT_CONFIG_PARAMETERS=$v git config --get-regexp "key.*" >actual &&
+	cat >expect <<-EOF &&
+	key.with equals.oldbool
+	key.with=equals.newbool
+	EOF
+	test_cmp expect actual
+'
+
 test_expect_success 'detect bogus GIT_CONFIG_PARAMETERS' '
 	cat >expect <<-\EOF &&
 	env.one one
@@ -1316,6 +1555,180 @@ test_expect_success 'detect bogus GIT_CONFIG_PARAMETERS' '
 		git config --get-regexp "env.*"
 '
 
+test_expect_success 'git --config-env=key=envvar support' '
+	cat >expect <<-\EOF &&
+	value
+	value
+	value
+	value
+	false
+	false
+	EOF
+	{
+		ENVVAR=value git --config-env=core.name=ENVVAR config core.name &&
+		ENVVAR=value git --config-env core.name=ENVVAR config core.name &&
+		ENVVAR=value git --config-env=foo.CamelCase=ENVVAR config foo.camelcase &&
+		ENVVAR=value git --config-env foo.CamelCase=ENVVAR config foo.camelcase &&
+		ENVVAR= git --config-env=foo.flag=ENVVAR config --bool foo.flag &&
+		ENVVAR= git --config-env foo.flag=ENVVAR config --bool foo.flag
+	} >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'git --config-env with missing value' '
+	test_must_fail env ENVVAR=value git --config-env 2>error &&
+	grep "no config key given for --config-env" error &&
+	test_must_fail env ENVVAR=value git --config-env config core.name 2>error &&
+	grep "invalid config format: config" error
+'
+
+test_expect_success 'git --config-env fails with invalid parameters' '
+	test_must_fail git --config-env=foo.flag config --bool foo.flag 2>error &&
+	test_grep "invalid config format: foo.flag" error &&
+	test_must_fail git --config-env=foo.flag= config --bool foo.flag 2>error &&
+	test_grep "missing environment variable name for configuration ${SQ}foo.flag${SQ}" error &&
+	sane_unset NONEXISTENT &&
+	test_must_fail git --config-env=foo.flag=NONEXISTENT config --bool foo.flag 2>error &&
+	test_grep "missing environment variable ${SQ}NONEXISTENT${SQ} for configuration ${SQ}foo.flag${SQ}" error
+'
+
+test_expect_success 'git -c and --config-env work together' '
+	cat >expect <<-\EOF &&
+	bar.cmd cmd-value
+	bar.env env-value
+	EOF
+	ENVVAR=env-value git \
+		-c bar.cmd=cmd-value \
+		--config-env=bar.env=ENVVAR \
+		config --get-regexp "^bar.*" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'git -c and --config-env override each other' '
+	cat >expect <<-\EOF &&
+	env
+	cmd
+	EOF
+	{
+		ENVVAR=env git -c bar.bar=cmd --config-env=bar.bar=ENVVAR config bar.bar &&
+		ENVVAR=env git --config-env=bar.bar=ENVVAR -c bar.bar=cmd config bar.bar
+	} >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success '--config-env handles keys with equals' '
+	echo value=with=equals >expect &&
+	ENVVAR=value=with=equals git \
+		--config-env=section.subsection=with=equals.key=ENVVAR \
+		config section.subsection=with=equals.key >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'git config handles environment config pairs' '
+	GIT_CONFIG_COUNT=2 \
+		GIT_CONFIG_KEY_0="pair.one" GIT_CONFIG_VALUE_0="foo" \
+		GIT_CONFIG_KEY_1="pair.two" GIT_CONFIG_VALUE_1="bar" \
+		git config --get-regexp "pair.*" >actual &&
+	cat >expect <<-EOF &&
+	pair.one foo
+	pair.two bar
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'git config ignores pairs without count' '
+	test_must_fail env GIT_CONFIG_KEY_0="pair.one" GIT_CONFIG_VALUE_0="value" \
+		git config pair.one 2>error &&
+	test_must_be_empty error
+'
+
+test_expect_success 'git config ignores pairs exceeding count' '
+	GIT_CONFIG_COUNT=1 \
+		GIT_CONFIG_KEY_0="pair.one" GIT_CONFIG_VALUE_0="value" \
+		GIT_CONFIG_KEY_1="pair.two" GIT_CONFIG_VALUE_1="value" \
+		git config --get-regexp "pair.*" >actual 2>error &&
+	cat >expect <<-EOF &&
+	pair.one value
+	EOF
+	test_cmp expect actual &&
+	test_must_be_empty error
+'
+
+test_expect_success 'git config ignores pairs with zero count' '
+	test_must_fail env \
+		GIT_CONFIG_COUNT=0 GIT_CONFIG_KEY_0="pair.one" GIT_CONFIG_VALUE_0="value" \
+		git config pair.one 2>error &&
+	test_must_be_empty error
+'
+
+test_expect_success 'git config ignores pairs with empty count' '
+	test_must_fail env \
+		GIT_CONFIG_COUNT= GIT_CONFIG_KEY_0="pair.one" GIT_CONFIG_VALUE_0="value" \
+		git config pair.one 2>error &&
+	test_must_be_empty error
+'
+
+test_expect_success 'git config fails with invalid count' '
+	test_must_fail env GIT_CONFIG_COUNT=10a git config --list 2>error &&
+	test_grep "bogus count" error &&
+	test_must_fail env GIT_CONFIG_COUNT=9999999999999999 git config --list 2>error &&
+	test_grep "too many entries" error
+'
+
+test_expect_success 'git config fails with missing config key' '
+	test_must_fail env GIT_CONFIG_COUNT=1 GIT_CONFIG_VALUE_0="value" \
+		git config --list 2>error &&
+	test_grep "missing config key" error
+'
+
+test_expect_success 'git config fails with missing config value' '
+	test_must_fail env GIT_CONFIG_COUNT=1 GIT_CONFIG_KEY_0="pair.one" \
+		git config --list 2>error &&
+	test_grep "missing config value" error
+'
+
+test_expect_success 'git config fails with invalid config pair key' '
+	test_must_fail env GIT_CONFIG_COUNT=1 \
+		GIT_CONFIG_KEY_0= GIT_CONFIG_VALUE_0=value \
+		git config --list &&
+	test_must_fail env GIT_CONFIG_COUNT=1 \
+		GIT_CONFIG_KEY_0=missing-section GIT_CONFIG_VALUE_0=value \
+		git config --list
+'
+
+test_expect_success 'environment overrides config file' '
+	test_when_finished "rm -f .git/config" &&
+	cat >.git/config <<-EOF &&
+	[pair]
+	one = value
+	EOF
+	GIT_CONFIG_COUNT=1 GIT_CONFIG_KEY_0=pair.one GIT_CONFIG_VALUE_0=override \
+		git config pair.one >actual &&
+	cat >expect <<-EOF &&
+	override
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'GIT_CONFIG_PARAMETERS overrides environment config' '
+	GIT_CONFIG_COUNT=1 GIT_CONFIG_KEY_0=pair.one GIT_CONFIG_VALUE_0=value \
+		GIT_CONFIG_PARAMETERS="${SQ}pair.one=override${SQ}" \
+		git config pair.one >actual &&
+	cat >expect <<-EOF &&
+	override
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'command line overrides environment config' '
+	GIT_CONFIG_COUNT=1 GIT_CONFIG_KEY_0=pair.one GIT_CONFIG_VALUE_0=value \
+		git -c pair.one=override config pair.one >actual &&
+	cat >expect <<-EOF &&
+	override
+	EOF
+	test_cmp expect actual
+'
+
 test_expect_success 'git config --edit works' '
 	git config -f tmp test.value no &&
 	echo test.value=yes >expect &&
@@ -1336,12 +1749,12 @@ test_expect_success 'git config --edit respects core.editor' '
 # malformed configuration files
 test_expect_success 'barf on syntax error' '
 	cat >.git/config <<-\EOF &&
-	# broken section line
+	# broken key=value
 	[section]
 	key garbage
 	EOF
-	test_must_fail git config --get section.key >actual 2>error &&
-	test_i18ngrep " line 3 " error
+	test_must_fail git config --get section.key 2>error &&
+	test_grep " line 3 " error
 '
 
 test_expect_success 'barf on incomplete section header' '
@@ -1350,18 +1763,18 @@ test_expect_success 'barf on incomplete section header' '
 	[section
 	key = value
 	EOF
-	test_must_fail git config --get section.key >actual 2>error &&
-	test_i18ngrep " line 2 " error
+	test_must_fail git config --get section.key 2>error &&
+	test_grep " line 2 " error
 '
 
 test_expect_success 'barf on incomplete string' '
 	cat >.git/config <<-\EOF &&
-	# broken section line
+	# broken value string
 	[section]
 	key = "value string
 	EOF
-	test_must_fail git config --get section.key >actual 2>error &&
-	test_i18ngrep " line 3 " error
+	test_must_fail git config --get section.key 2>error &&
+	test_grep " line 3 " error
 '
 
 test_expect_success 'urlmatch' '
@@ -1392,6 +1805,21 @@ test_expect_success 'urlmatch' '
 	test_cmp expect actual
 '
 
+test_expect_success 'urlmatch with --show-scope' '
+	cat >.git/config <<-\EOF &&
+	[http "https://weak.example.com"]
+		sslVerify = false
+		cookieFile = /tmp/cookie.txt
+	EOF
+
+	cat >expect <<-EOF &&
+	local	http.cookiefile /tmp/cookie.txt
+	local	http.sslverify false
+	EOF
+	git config --get-urlmatch --show-scope HTTP https://weak.example.com >actual &&
+	test_cmp expect actual
+'
+
 test_expect_success 'urlmatch favors more specific URLs' '
 	cat >.git/config <<-\EOF &&
 	[http "https://example.com/"]
@@ -1661,9 +2089,11 @@ test_expect_success '--show-origin with --list' '
 	file:.git/config	user.override=local
 	file:.git/config	include.path=../include/relative.include
 	file:.git/../include/relative.include	user.relative=include
+	command line:	user.environ=true
 	command line:	user.cmdline=true
 	EOF
-	git -c user.cmdline=true config --list --show-origin >output &&
+	GIT_CONFIG_COUNT=1 GIT_CONFIG_KEY_0=user.environ GIT_CONFIG_VALUE_0=true\
+		git -c user.cmdline=true config --list --show-origin >output &&
 	test_cmp expect output
 '
 
@@ -1716,11 +2146,11 @@ test_expect_success '--show-origin getting a single key' '
 '
 
 test_expect_success 'set up custom config file' '
-	CUSTOM_CONFIG_FILE="custom.conf" &&
-	cat >"$CUSTOM_CONFIG_FILE" <<-\EOF
+	cat >"custom.conf" <<-\EOF &&
 	[user]
 		custom = true
 	EOF
+	CUSTOM_CONFIG_FILE="$(test-tool path-utils real_path custom.conf)"
 '
 
 test_expect_success !MINGW 'set up custom config file with special name characters' '
@@ -1759,22 +2189,39 @@ test_expect_success '--show-origin stdin with file include' '
 '
 
 test_expect_success '--show-origin blob' '
-	blob=$(git hash-object -w "$CUSTOM_CONFIG_FILE") &&
-	cat >expect <<-EOF &&
-	blob:$blob	user.custom=true
-	EOF
-	git config --blob=$blob --show-origin --list >output &&
-	test_cmp expect output
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	(
+		cd repo &&
+		blob=$(git hash-object -w "$CUSTOM_CONFIG_FILE") &&
+		cat >expect <<-EOF &&
+		blob:$blob	user.custom=true
+		EOF
+		git config --blob=$blob --show-origin --list >output &&
+		test_cmp expect output
+	)
 '
 
 test_expect_success '--show-origin blob ref' '
-	cat >expect <<-\EOF &&
-	blob:master:custom.conf	user.custom=true
-	EOF
-	git add "$CUSTOM_CONFIG_FILE" &&
-	git commit -m "new config file" &&
-	git config --blob=master:"$CUSTOM_CONFIG_FILE" --show-origin --list >output &&
-	test_cmp expect output
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	(
+		cd repo &&
+		cat >expect <<-\EOF &&
+		blob:main:custom.conf	user.custom=true
+		EOF
+		cp "$CUSTOM_CONFIG_FILE" custom.conf &&
+		git add custom.conf &&
+		git commit -m "new config file" &&
+		git config --blob=main:custom.conf --show-origin --list >output &&
+		test_cmp expect output
+	)
+'
+
+test_expect_success '--show-origin with --default' '
+	git config --show-origin --default foo some.key >actual &&
+	echo "command line:	foo" >expect &&
+	test_cmp expect actual
 '
 
 test_expect_success '--show-scope with --list' '
@@ -1787,8 +2234,17 @@ test_expect_success '--show-scope with --list' '
 	local	user.override=local
 	local	include.path=../include/relative.include
 	local	user.relative=include
+	local	core.repositoryformatversion=1
+	local	extensions.worktreeconfig=true
+	worktree	user.worktree=true
 	command	user.cmdline=true
 	EOF
+	git worktree add wt1 &&
+	# We need these to test for worktree scope, but outside of this
+	# test, this is just noise
+	test_config core.repositoryformatversion 1 &&
+	test_config extensions.worktreeConfig true &&
+	git config --worktree user.worktree true &&
 	git -c user.cmdline=true config --list --show-scope >output &&
 	test_cmp expect output
 '
@@ -1836,61 +2292,162 @@ test_expect_success '--show-scope with --show-origin' '
 	test_cmp expect output
 '
 
-test_expect_success '--local requires a repo' '
-	# we expect 128 to ensure that we do not simply
-	# fail to find anything and return code "1"
-	test_expect_code 128 nongit git config --local foo.bar
+test_expect_success '--show-scope with --default' '
+	git config --show-scope --default foo some.key >actual &&
+	echo "command	foo" >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'override global and system config' '
+	test_when_finished rm -f \"\$HOME\"/.gitconfig &&
+	cat >"$HOME"/.gitconfig <<-EOF &&
+	[home]
+		config = true
+	EOF
+
+	test_when_finished rm -rf \"\$HOME\"/.config/git &&
+	mkdir -p "$HOME"/.config/git &&
+	cat >"$HOME"/.config/git/config <<-EOF &&
+	[xdg]
+		config = true
+	EOF
+	cat >.git/config <<-EOF &&
+	[local]
+		config = true
+	EOF
+	cat >custom-global-config <<-EOF &&
+	[global]
+		config = true
+	EOF
+	cat >custom-system-config <<-EOF &&
+	[system]
+		config = true
+	EOF
+
+	cat >expect <<-EOF &&
+	global	xdg.config=true
+	global	home.config=true
+	local	local.config=true
+	EOF
+	git config --show-scope --list >output &&
+	test_cmp expect output &&
+
+	cat >expect <<-EOF &&
+	system	system.config=true
+	global	global.config=true
+	local	local.config=true
+	EOF
+	GIT_CONFIG_NOSYSTEM=false GIT_CONFIG_SYSTEM=custom-system-config GIT_CONFIG_GLOBAL=custom-global-config \
+		git config --show-scope --list >output &&
+	test_cmp expect output &&
+
+	cat >expect <<-EOF &&
+	local	local.config=true
+	EOF
+	GIT_CONFIG_NOSYSTEM=false GIT_CONFIG_SYSTEM=/dev/null GIT_CONFIG_GLOBAL=/dev/null \
+		git config --show-scope --list >output &&
+	test_cmp expect output
+'
+
+test_expect_success 'override global and system config with missing file' '
+	test_must_fail env GIT_CONFIG_GLOBAL=does-not-exist GIT_CONFIG_SYSTEM=/dev/null git config --global --list &&
+	test_must_fail env GIT_CONFIG_GLOBAL=/dev/null GIT_CONFIG_SYSTEM=does-not-exist git config --system --list &&
+	GIT_CONFIG_GLOBAL=does-not-exist GIT_CONFIG_SYSTEM=does-not-exist git version
 '
 
+test_expect_success 'system override has no effect with GIT_CONFIG_NOSYSTEM' '
+	# `git config --system` has different semantics compared to other
+	# commands as it ignores GIT_CONFIG_NOSYSTEM. We thus test whether the
+	# variable has an effect via a different proxy.
+	cat >alias-config <<-EOF &&
+	[alias]
+		hello-world = !echo "hello world"
+	EOF
+	test_must_fail env GIT_CONFIG_NOSYSTEM=true GIT_CONFIG_SYSTEM=alias-config \
+		git hello-world &&
+	GIT_CONFIG_NOSYSTEM=false GIT_CONFIG_SYSTEM=alias-config \
+		git hello-world >actual &&
+	echo "hello world" >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'write to overridden global and system config' '
+	cat >expect <<EOF &&
+[config]
+	key = value
+EOF
+
+	GIT_CONFIG_GLOBAL=write-to-global git config --global config.key value &&
+	test_cmp expect write-to-global &&
+
+	GIT_CONFIG_SYSTEM=write-to-system git config --system config.key value &&
+	test_cmp expect write-to-system
+'
+
+for opt in --local --worktree
+do
+	test_expect_success "$opt requires a repo" '
+		# we expect 128 to ensure that we do not simply
+		# fail to find anything and return code "1"
+		test_expect_code 128 nongit git config $opt foo.bar
+	'
+done
+
 cat >.git/config <<-\EOF &&
-[core]
+[section]
 foo = true
 number = 10
 big = 1M
 EOF
 
 test_expect_success 'identical modern --type specifiers are allowed' '
-	test_cmp_config 1048576 --type=int --type=int core.big
+	test_cmp_config 1048576 --type=int --type=int section.big
 '
 
 test_expect_success 'identical legacy --type specifiers are allowed' '
-	test_cmp_config 1048576 --int --int core.big
+	test_cmp_config 1048576 --int --int section.big
 '
 
 test_expect_success 'identical mixed --type specifiers are allowed' '
-	test_cmp_config 1048576 --int --type=int core.big
+	test_cmp_config 1048576 --int --type=int section.big
 '
 
 test_expect_success 'non-identical modern --type specifiers are not allowed' '
-	test_must_fail git config --type=int --type=bool core.big 2>error &&
-	test_i18ngrep "only one type at a time" error
+	test_must_fail git config --type=int --type=bool section.big 2>error &&
+	test_grep "only one type at a time" error
 '
 
 test_expect_success 'non-identical legacy --type specifiers are not allowed' '
-	test_must_fail git config --int --bool core.big 2>error &&
-	test_i18ngrep "only one type at a time" error
+	test_must_fail git config --int --bool section.big 2>error &&
+	test_grep "only one type at a time" error
 '
 
 test_expect_success 'non-identical mixed --type specifiers are not allowed' '
-	test_must_fail git config --type=int --bool core.big 2>error &&
-	test_i18ngrep "only one type at a time" error
+	test_must_fail git config --type=int --bool section.big 2>error &&
+	test_grep "only one type at a time" error
 '
 
 test_expect_success '--type allows valid type specifiers' '
-	test_cmp_config true  --type=bool core.foo
+	test_cmp_config true  --type=bool section.foo
 '
 
 test_expect_success '--no-type unsets type specifiers' '
-	test_cmp_config 10 --type=bool --no-type core.number
+	test_cmp_config 10 --type=bool --no-type section.number
 '
 
 test_expect_success 'unset type specifiers may be reset to conflicting ones' '
-	test_cmp_config 1048576 --type=bool --no-type --type=int core.big
+	test_cmp_config 1048576 --type=bool --no-type --type=int section.big
 '
 
 test_expect_success '--type rejects unknown specifiers' '
-	test_must_fail git config --type=nonsense core.foo 2>error &&
-	test_i18ngrep "unrecognized --type argument" error
+	test_must_fail git config --type=nonsense section.foo 2>error &&
+	test_grep "unrecognized --type argument" error
+'
+
+test_expect_success '--type=int requires at least one digit' '
+	test_must_fail git config --type int --default m some.key >out 2>error &&
+	grep "bad numeric config value" error &&
+	test_must_be_empty out
 '
 
 test_expect_success '--replace-all does not invent newlines' '
@@ -1914,4 +2471,271 @@ test_expect_success '--replace-all does not invent newlines' '
 	test_cmp expect .git/config
 '
 
+test_expect_success 'set all config with value-pattern' '
+	test_when_finished rm -f config initial &&
+	git config --file=initial abc.key one &&
+
+	# no match => add new entry
+	cp initial config &&
+	git config --file=config abc.key two a+ &&
+	git config --file=config --list >actual &&
+	cat >expect <<-\EOF &&
+	abc.key=one
+	abc.key=two
+	EOF
+	test_cmp expect actual &&
+
+	# multiple matches => failure
+	test_must_fail git config --file=config abc.key three o+ 2>err &&
+	test_grep "has multiple values" err &&
+
+	# multiple values, no match => add
+	git config --file=config abc.key three a+ &&
+	git config --file=config --list >actual &&
+	cat >expect <<-\EOF &&
+	abc.key=one
+	abc.key=two
+	abc.key=three
+	EOF
+	test_cmp expect actual &&
+
+	# single match => replace
+	git config --file=config abc.key four h+ &&
+	git config --file=config --list >actual &&
+	cat >expect <<-\EOF &&
+	abc.key=one
+	abc.key=two
+	abc.key=four
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success '--replace-all and value-pattern' '
+	test_when_finished rm -f config &&
+	git config --file=config --add abc.key one &&
+	git config --file=config --add abc.key two &&
+	git config --file=config --add abc.key three &&
+	git config --file=config --replace-all abc.key four "o+" &&
+	git config --file=config --list >actual &&
+	cat >expect <<-\EOF &&
+	abc.key=four
+	abc.key=three
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'refuse --fixed-value for incompatible actions' '
+	test_when_finished rm -f config &&
+	git config --file=config dev.null bogus &&
+
+	# These modes do not allow --fixed-value at all
+	test_must_fail git config --file=config --fixed-value --add dev.null bogus &&
+	test_must_fail git config --file=config --fixed-value --get-urlmatch dev.null bogus &&
+	test_must_fail git config --file=config --fixed-value --get-urlmatch dev.null bogus &&
+	test_must_fail git config --file=config --fixed-value --rename-section dev null &&
+	test_must_fail git config --file=config --fixed-value --remove-section dev &&
+	test_must_fail git config --file=config --fixed-value --list &&
+	test_must_fail git config --file=config --fixed-value --get-color dev.null &&
+	test_must_fail git config --file=config --fixed-value --get-colorbool dev.null &&
+
+	# These modes complain when --fixed-value has no value-pattern
+	test_must_fail git config --file=config --fixed-value dev.null bogus &&
+	test_must_fail git config --file=config --fixed-value --replace-all dev.null bogus &&
+	test_must_fail git config --file=config --fixed-value --get dev.null &&
+	test_must_fail git config --file=config --fixed-value --get-all dev.null &&
+	test_must_fail git config --file=config --fixed-value --get-regexp "dev.*" &&
+	test_must_fail git config --file=config --fixed-value --unset dev.null &&
+	test_must_fail git config --file=config --fixed-value --unset-all dev.null
+'
+
+test_expect_success '--fixed-value uses exact string matching' '
+	test_when_finished rm -f config initial &&
+	META="a+b*c?d[e]f.g" &&
+	git config --file=initial fixed.test "$META" &&
+
+	cp initial config &&
+	git config --file=config fixed.test bogus "$META" &&
+	git config --file=config --list >actual &&
+	cat >expect <<-EOF &&
+	fixed.test=$META
+	fixed.test=bogus
+	EOF
+	test_cmp expect actual &&
+
+	cp initial config &&
+	git config --file=config --fixed-value fixed.test bogus "$META" &&
+	git config --file=config --list >actual &&
+	cat >expect <<-\EOF &&
+	fixed.test=bogus
+	EOF
+	test_cmp expect actual &&
+
+	cp initial config &&
+	test_must_fail git config --file=config --unset fixed.test "$META" &&
+	git config --file=config --fixed-value --unset fixed.test "$META" &&
+	test_must_fail git config --file=config fixed.test &&
+
+	cp initial config &&
+	test_must_fail git config --file=config --unset-all fixed.test "$META" &&
+	git config --file=config --fixed-value --unset-all fixed.test "$META" &&
+	test_must_fail git config --file=config fixed.test &&
+
+	cp initial config &&
+	git config --file=config --replace-all fixed.test bogus "$META" &&
+	git config --file=config --list >actual &&
+	cat >expect <<-EOF &&
+	fixed.test=$META
+	fixed.test=bogus
+	EOF
+	test_cmp expect actual &&
+
+	git config --file=config --fixed-value --replace-all fixed.test bogus "$META" &&
+	git config --file=config --list >actual &&
+	cat >expect <<-EOF &&
+	fixed.test=bogus
+	fixed.test=bogus
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success '--get and --get-all with --fixed-value' '
+	test_when_finished rm -f config &&
+	META="a+b*c?d[e]f.g" &&
+	git config --file=config fixed.test bogus &&
+	git config --file=config --add fixed.test "$META" &&
+
+	git config --file=config --get fixed.test bogus &&
+	test_must_fail git config --file=config --get fixed.test "$META" &&
+	git config --file=config --get --fixed-value fixed.test "$META" &&
+	test_must_fail git config --file=config --get --fixed-value fixed.test non-existent &&
+
+	git config --file=config --get-all fixed.test bogus &&
+	test_must_fail git config --file=config --get-all fixed.test "$META" &&
+	git config --file=config --get-all --fixed-value fixed.test "$META" &&
+	test_must_fail git config --file=config --get-all --fixed-value fixed.test non-existent &&
+
+	git config --file=config --get-regexp fixed+ bogus &&
+	test_must_fail git config --file=config --get-regexp fixed+ "$META" &&
+	git config --file=config --get-regexp --fixed-value fixed+ "$META" &&
+	test_must_fail git config --file=config --get-regexp --fixed-value fixed+ non-existent
+'
+
+test_expect_success 'includeIf.hasconfig:remote.*.url' '
+	git init hasremoteurlTest &&
+	test_when_finished "rm -rf hasremoteurlTest" &&
+
+	cat >include-this <<-\EOF &&
+	[user]
+		this = this-is-included
+	EOF
+	cat >dont-include-that <<-\EOF &&
+	[user]
+		that = that-is-not-included
+	EOF
+	cat >>hasremoteurlTest/.git/config <<-EOF &&
+	[includeIf "hasconfig:remote.*.url:foourl"]
+		path = "$(pwd)/include-this"
+	[includeIf "hasconfig:remote.*.url:barurl"]
+		path = "$(pwd)/dont-include-that"
+	[remote "foo"]
+		url = foourl
+	EOF
+
+	echo this-is-included >expect-this &&
+	git -C hasremoteurlTest config --get user.this >actual-this &&
+	test_cmp expect-this actual-this &&
+
+	test_must_fail git -C hasremoteurlTest config --get user.that
+'
+
+test_expect_success 'includeIf.hasconfig:remote.*.url respects last-config-wins' '
+	git init hasremoteurlTest &&
+	test_when_finished "rm -rf hasremoteurlTest" &&
+
+	cat >include-two-three <<-\EOF &&
+	[user]
+		two = included-config
+		three = included-config
+	EOF
+	cat >>hasremoteurlTest/.git/config <<-EOF &&
+	[remote "foo"]
+		url = foourl
+	[user]
+		one = main-config
+		two = main-config
+	[includeIf "hasconfig:remote.*.url:foourl"]
+		path = "$(pwd)/include-two-three"
+	[user]
+		three = main-config
+	EOF
+
+	echo main-config >expect-main-config &&
+	echo included-config >expect-included-config &&
+
+	git -C hasremoteurlTest config --get user.one >actual &&
+	test_cmp expect-main-config actual &&
+
+	git -C hasremoteurlTest config --get user.two >actual &&
+	test_cmp expect-included-config actual &&
+
+	git -C hasremoteurlTest config --get user.three >actual &&
+	test_cmp expect-main-config actual
+'
+
+test_expect_success 'includeIf.hasconfig:remote.*.url globs' '
+	git init hasremoteurlTest &&
+	test_when_finished "rm -rf hasremoteurlTest" &&
+
+	printf "[user]\ndss = yes\n" >double-star-start &&
+	printf "[user]\ndse = yes\n" >double-star-end &&
+	printf "[user]\ndsm = yes\n" >double-star-middle &&
+	printf "[user]\nssm = yes\n" >single-star-middle &&
+	printf "[user]\nno = no\n" >no &&
+
+	cat >>hasremoteurlTest/.git/config <<-EOF &&
+	[remote "foo"]
+		url = https://foo/bar/baz
+	[includeIf "hasconfig:remote.*.url:**/baz"]
+		path = "$(pwd)/double-star-start"
+	[includeIf "hasconfig:remote.*.url:**/nomatch"]
+		path = "$(pwd)/no"
+	[includeIf "hasconfig:remote.*.url:https:/**"]
+		path = "$(pwd)/double-star-end"
+	[includeIf "hasconfig:remote.*.url:nomatch:/**"]
+		path = "$(pwd)/no"
+	[includeIf "hasconfig:remote.*.url:https:/**/baz"]
+		path = "$(pwd)/double-star-middle"
+	[includeIf "hasconfig:remote.*.url:https:/**/nomatch"]
+		path = "$(pwd)/no"
+	[includeIf "hasconfig:remote.*.url:https://*/bar/baz"]
+		path = "$(pwd)/single-star-middle"
+	[includeIf "hasconfig:remote.*.url:https://*/baz"]
+		path = "$(pwd)/no"
+	EOF
+
+	git -C hasremoteurlTest config --get user.dss &&
+	git -C hasremoteurlTest config --get user.dse &&
+	git -C hasremoteurlTest config --get user.dsm &&
+	git -C hasremoteurlTest config --get user.ssm &&
+	test_must_fail git -C hasremoteurlTest config --get user.no
+'
+
+test_expect_success 'includeIf.hasconfig:remote.*.url forbids remote url in such included files' '
+	git init hasremoteurlTest &&
+	test_when_finished "rm -rf hasremoteurlTest" &&
+
+	cat >include-with-url <<-\EOF &&
+	[remote "bar"]
+		url = barurl
+	EOF
+	cat >>hasremoteurlTest/.git/config <<-EOF &&
+	[includeIf "hasconfig:remote.*.url:foourl"]
+		path = "$(pwd)/include-with-url"
+	EOF
+
+	# test with any Git command
+	test_must_fail git -C hasremoteurlTest status 2>err &&
+	grep "fatal: remote URLs cannot be configured in file directly or indirectly included by includeIf.hasconfig:remote.*.url" err
+'
+
 test_done
diff --git a/t/t1301-shared-repo.sh b/t/t1301-shared-repo.sh
index 2dc853d..29cf8a9 100755
--- a/t/t1301-shared-repo.sh
+++ b/t/t1301-shared-repo.sh
@@ -5,6 +5,11 @@
 
 test_description='Test shared repository initialization'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_CREATE_REPO_NO_TEMPLATE=1
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # Remove a default ACL from the test dir if possible.
@@ -22,6 +27,7 @@ test_expect_success 'shared = 0400 (faulty permission u-w)' '
 for u in 002 022
 do
 	test_expect_success POSIXPERM "shared=1 does not clear bits preset by umask $u" '
+		test_when_finished "rm -rf sub" &&
 		mkdir sub && (
 			cd sub &&
 			umask $u &&
@@ -39,21 +45,30 @@ do
 			;;
 		esac
 	'
-	rm -rf sub
 done
 
 test_expect_success 'shared=all' '
-	mkdir sub &&
-	cd sub &&
-	git init --shared=all &&
+	git init --template= --shared=all &&
 	test 2 = $(git config core.sharedrepository)
 '
 
+test_expect_success 'template cannot set core.bare' '
+	test_when_finished "rm -rf subdir" &&
+	test_when_finished "rm -rf templates" &&
+	test_config core.bare true &&
+	umask 0022 &&
+	mkdir -p templates/ &&
+	cp .git/config templates/config &&
+	git init --template=templates subdir &&
+	test_path_is_missing subdir/HEAD
+'
+
 test_expect_success POSIXPERM 'update-server-info honors core.sharedRepository' '
 	: > a1 &&
 	git add a1 &&
 	test_tick &&
 	git commit -m a1 &&
+	mkdir .git/info &&
 	umask 0277 &&
 	git update-server-info &&
 	actual="$(ls -l .git/info/refs)" &&
@@ -85,7 +100,7 @@ do
 		rm -f .git/info/refs &&
 		git update-server-info &&
 		actual="$(test_modebits .git/info/refs)" &&
-		verbose test "x$actual" = "x-$y"
+		test "x$actual" = "x-$y"
 
 	'
 
@@ -95,7 +110,7 @@ do
 		rm -f .git/info/refs &&
 		git update-server-info &&
 		actual="$(test_modebits .git/info/refs)" &&
-		verbose test "x$actual" = "x-$x"
+		test "x$actual" = "x-$x"
 
 	'
 
@@ -111,23 +126,8 @@ test_expect_success POSIXPERM 'info/refs respects umask in unshared repo' '
 	test_cmp expect actual
 '
 
-test_expect_success POSIXPERM 'git reflog expire honors core.sharedRepository' '
-	umask 077 &&
-	git config core.sharedRepository group &&
-	git reflog expire --all &&
-	actual="$(ls -l .git/logs/refs/heads/master)" &&
-	case "$actual" in
-	-rw-rw-*)
-		: happy
-		;;
-	*)
-		echo Ooops, .git/logs/refs/heads/master is not 0662 [$actual]
-		false
-		;;
-	esac
-'
-
 test_expect_success POSIXPERM 'forced modes' '
+	test_when_finished "rm -rf new" &&
 	mkdir -p templates/hooks &&
 	echo update-server-info >templates/hooks/post-update &&
 	chmod +x templates/hooks/post-update &&
@@ -136,7 +136,8 @@ test_expect_success POSIXPERM 'forced modes' '
 	(
 		cd new &&
 		umask 002 &&
-		git init --shared=0660 --template=templates &&
+		git init --shared=0660 --template=../templates &&
+		test_path_is_file .git/hooks/post-update &&
 		>frotz &&
 		git add frotz &&
 		git commit -a -m initial &&
@@ -169,6 +170,7 @@ test_expect_success POSIXPERM 'forced modes' '
 '
 
 test_expect_success POSIXPERM 'remote init does not use config from cwd' '
+	test_when_finished "rm -rf child.git" &&
 	git config core.sharedrepository 0666 &&
 	umask 0022 &&
 	git init --bare child.git &&
@@ -188,7 +190,7 @@ test_expect_success POSIXPERM 're-init respects core.sharedrepository (local)' '
 '
 
 test_expect_success POSIXPERM 're-init respects core.sharedrepository (remote)' '
-	rm -rf child.git &&
+	test_when_finished "rm -rf child.git" &&
 	umask 0022 &&
 	git init --bare --shared=0666 child.git &&
 	test_path_is_missing child.git/foo &&
@@ -199,7 +201,7 @@ test_expect_success POSIXPERM 're-init respects core.sharedrepository (remote)'
 '
 
 test_expect_success POSIXPERM 'template can set core.sharedrepository' '
-	rm -rf child.git &&
+	test_when_finished "rm -rf child.git" &&
 	umask 0022 &&
 	git config core.sharedrepository 0666 &&
 	cp .git/config templates/config &&
diff --git a/t/t1302-repo-version.sh b/t/t1302-repo-version.sh
index 0acabb6..42caa0d 100755
--- a/t/t1302-repo-version.sh
+++ b/t/t1302-repo-version.sh
@@ -5,13 +5,10 @@
 
 test_description='Test repository version check'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
-	test_oid_cache <<-\EOF &&
-	version sha1:0
-	version sha256:1
-	EOF
 	cat >test.patch <<-\EOF &&
 	diff --git a/test.txt b/test.txt
 	new file mode 100644
@@ -27,7 +24,12 @@ test_expect_success 'setup' '
 '
 
 test_expect_success 'gitdir selection on normal repos' '
-	echo $(test_oid version) >expect &&
+	if test_have_prereq DEFAULT_REPO_FORMAT
+	then
+		echo 0
+	else
+		echo 1
+	fi >expect &&
 	git config core.repositoryformatversion >actual &&
 	git -C test config core.repositoryformatversion >actual2 &&
 	test_cmp expect actual &&
@@ -36,7 +38,7 @@ test_expect_success 'gitdir selection on normal repos' '
 
 test_expect_success 'gitdir selection on unsupported repo' '
 	# Make sure it would stop at test2, not trash
-	test_expect_code 1 git -C test2 config core.repositoryformatversion >actual
+	test_expect_code 1 git -C test2 config core.repositoryformatversion
 '
 
 test_expect_success 'gitdir not required mode' '
@@ -78,8 +80,13 @@ mkconfig () {
 
 while read outcome version extensions; do
 	test_expect_success "$outcome version=$version $extensions" "
-		mkconfig $version $extensions >.git/config &&
-		check_${outcome}
+		test_when_finished 'rm -rf extensions' &&
+		git init extensions &&
+		(
+			cd extensions &&
+			mkconfig $version $extensions >.git/config &&
+			check_${outcome}
+		)
 	"
 done <<\EOF
 allow 0
@@ -93,7 +100,8 @@ allow 1 noop-v1
 EOF
 
 test_expect_success 'precious-objects allowed' '
-	mkconfig 1 preciousObjects >.git/config &&
+	git config core.repositoryFormatVersion 1 &&
+	git config extensions.preciousObjects 1 &&
 	check_allow
 '
 
diff --git a/t/t1303-wacky-config.sh b/t/t1303-wacky-config.sh
index 0000e66..0506f3d 100755
--- a/t/t1303-wacky-config.sh
+++ b/t/t1303-wacky-config.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='Test wacky input to git config'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # Leaving off the newline is intentional!
diff --git a/t/t1304-default-acl.sh b/t/t1304-default-acl.sh
index 335d3f3..31b89dd 100755
--- a/t/t1304-default-acl.sh
+++ b/t/t1304-default-acl.sh
@@ -9,6 +9,7 @@ test_description='Test repository with default ACL'
 # => this must come before . ./test-lib.sh
 umask 077
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # We need an arbitrary other user give permission to using ACLs. root
@@ -18,7 +19,7 @@ test_expect_success 'checking for a working acl setup' '
 	if setfacl -m d:m:rwx -m u:root:rwx . &&
 	   getfacl . | grep user:root:rwx &&
 	   touch should-have-readable-acl &&
-	   getfacl should-have-readable-acl | egrep "mask::?rw-"
+	   getfacl should-have-readable-acl | grep -E "mask::?rw-"
 	then
 		test_set_prereq SETFACL
 	fi
@@ -34,7 +35,7 @@ check_perms_and_acl () {
 	getfacl "$1" > actual &&
 	grep -q "user:root:rwx" actual &&
 	grep -q "user:${LOGNAME}:rwx" actual &&
-	egrep "mask::?r--" actual > /dev/null 2>&1 &&
+	grep -E "mask::?r--" actual > /dev/null 2>&1 &&
 	grep -q "group::---" actual || false
 }
 
diff --git a/t/t1305-config-include.sh b/t/t1305-config-include.sh
index f1e1b28..5cde79e 100755
--- a/t/t1305-config-include.sh
+++ b/t/t1305-config-include.sh
@@ -1,6 +1,7 @@
 #!/bin/sh
 
 test_description='test config file include directives'
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # Force setup_explicit_git_dir() to run until the end. This is needed
@@ -312,7 +313,7 @@ test_expect_success SYMLINKS 'conditional include, gitdir matching symlink, icas
 test_expect_success 'conditional include, onbranch' '
 	echo "[includeIf \"onbranch:foo-branch\"]path=bar9" >>.git/config &&
 	echo "[test]nine=9" >.git/bar9 &&
-	git checkout -b master &&
+	git checkout -b main &&
 	test_must_fail git config test.nine &&
 	git checkout -b foo-branch &&
 	echo 9 >expect &&
@@ -352,9 +353,7 @@ test_expect_success 'include cycles are detected' '
 	git init --bare cycle &&
 	git -C cycle config include.path cycle &&
 	git config -f cycle/cycle include.path config &&
-	test_must_fail \
-		env GIT_TEST_GETTEXT_POISON=false \
-		git -C cycle config --get-all test.value 2>stderr &&
+	test_must_fail git -C cycle config --get-all test.value 2>stderr &&
 	grep "exceeded maximum include depth" stderr
 '
 
diff --git a/t/t1306-xdg-files.sh b/t/t1306-xdg-files.sh
index dd87b43..40d3c42 100755
--- a/t/t1306-xdg-files.sh
+++ b/t/t1306-xdg-files.sh
@@ -116,7 +116,7 @@ test_expect_success 'Exclusion in a non-XDG global ignore file' '
 test_expect_success 'Checking XDG ignore file when HOME is unset' '
 	(sane_unset HOME &&
 	 git config --unset core.excludesfile &&
-	 git ls-files --exclude-standard --ignored >actual) &&
+	 git ls-files --exclude-standard --ignored --others >actual) &&
 	test_must_be_empty actual
 '
 
diff --git a/t/t1307-config-blob.sh b/t/t1307-config-blob.sh
index 002e6d3..b9852fe 100755
--- a/t/t1307-config-blob.sh
+++ b/t/t1307-config-blob.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='support for reading config from a blob'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'create config blob' '
@@ -61,13 +63,11 @@ test_expect_success 'parse errors in blobs are properly attributed' '
 	git commit -m broken &&
 
 	test_must_fail git config --blob=HEAD:config some.value 2>err &&
-	test_i18ngrep "HEAD:config" err
+	test_grep "HEAD:config" err
 '
 
 test_expect_success 'can parse blob ending with CR' '
-	printf "[some]key = value\\r" >config &&
-	git add config &&
-	git commit -m CR &&
+	test_commit --printf CR config "[some]key = value\\r" &&
 	echo value >expect &&
 	git config --blob=HEAD:config some.key >actual &&
 	test_cmp expect actual
diff --git a/t/t1308-config-set.sh b/t/t1308-config-set.sh
index 3a527e3..3bfec07 100755
--- a/t/t1308-config-set.sh
+++ b/t/t1308-config-set.sh
@@ -2,6 +2,7 @@
 
 test_description='Test git config-set API in different settings'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # 'check_config get_* section.key value' verifies that the entry for
@@ -57,6 +58,8 @@ test_expect_success 'setup default config' '
 		skin = false
 		nose = 1
 		horns
+	[value]
+		less
 	EOF
 '
 
@@ -115,10 +118,53 @@ test_expect_success 'find value with the highest priority' '
 	check_config get_value case.baz "hask"
 '
 
+test_expect_success 'return value for an existing key' '
+	test-tool config get lamb.chop >out 2>err &&
+	test_must_be_empty out &&
+	test_must_be_empty err
+'
+
+test_expect_success 'return value for value-less key' '
+	test-tool config get value.less >out 2>err &&
+	test_must_be_empty out &&
+	test_must_be_empty err
+'
+
+test_expect_success 'return value for a missing key' '
+	cat >expect <<-\EOF &&
+	Value not found for "missing.key"
+	EOF
+	test_expect_code 1 test-tool config get missing.key >actual 2>err &&
+	test_cmp actual expect &&
+	test_must_be_empty err
+'
+
+test_expect_success 'return value for a bad key: CONFIG_INVALID_KEY' '
+	cat >expect <<-\EOF &&
+	Key "fails.iskeychar.-" is invalid
+	EOF
+	test_expect_code 1 test-tool config get fails.iskeychar.- >actual 2>err &&
+	test_cmp actual expect &&
+	test_must_be_empty out
+'
+
+test_expect_success 'return value for a bad key: CONFIG_NO_SECTION_OR_NAME' '
+	cat >expect <<-\EOF &&
+	Key "keynosection" has no section
+	EOF
+	test_expect_code 1 test-tool config get keynosection >actual 2>err &&
+	test_cmp actual expect &&
+	test_must_be_empty out
+'
+
 test_expect_success 'find integer value for a key' '
 	check_config get_int lamb.chop 65
 '
 
+test_expect_success 'parse integer value during iteration' '
+	check_config git_config_int lamb.chop 65
+'
+
 test_expect_success 'find string value for a key' '
 	check_config get_string case.baz hask &&
 	check_config expect_code 1 get_string case.ba "Value not found for \"case.ba\""
@@ -126,13 +172,18 @@ test_expect_success 'find string value for a key' '
 
 test_expect_success 'check line error when NULL string is queried' '
 	test_expect_code 128 test-tool config get_string case.foo 2>result &&
-	test_i18ngrep "fatal: .*case\.foo.*\.git/config.*line 7" result
+	test_grep "fatal: .*case\.foo.*\.git/config.*line 7" result
 '
 
 test_expect_success 'find integer if value is non parse-able' '
 	check_config expect_code 128 get_int lamb.head
 '
 
+test_expect_success 'non parse-able integer value during iteration' '
+	check_config expect_code 128 git_config_int lamb.head 2>result &&
+	grep "fatal: bad numeric config value .* in file \.git/config" result
+'
+
 test_expect_success 'find bool value for the entered key' '
 	check_config get_bool goat.head 1 &&
 	check_config get_bool goat.skin 0 &&
@@ -145,6 +196,71 @@ test_expect_success 'find multiple values' '
 	check_config get_value_multi case.baz sam bat hask
 '
 
+test_NULL_in_multi () {
+	local op="$1" &&
+	local file="$2" &&
+
+	test_expect_success "$op: NULL value in config${file:+ in $file}" '
+		config="$file" &&
+		if test -z "$config"
+		then
+			config=.git/config &&
+			test_when_finished "mv $config.old $config" &&
+			mv "$config" "$config".old
+		fi &&
+
+		# Value-less in the middle of a list
+		cat >"$config" <<-\EOF &&
+		[a]key=x
+		[a]key
+		[a]key=y
+		EOF
+		case "$op" in
+		*_multi)
+			cat >expect <<-\EOF
+			x
+			(NULL)
+			y
+			EOF
+			;;
+		*)
+			cat >expect <<-\EOF
+			y
+			EOF
+			;;
+		esac &&
+		test-tool config "$op" a.key $file >actual &&
+		test_cmp expect actual &&
+
+		# Value-less at the end of a least
+		cat >"$config" <<-\EOF &&
+		[a]key=x
+		[a]key=y
+		[a]key
+		EOF
+		case "$op" in
+		*_multi)
+			cat >expect <<-\EOF
+			x
+			y
+			(NULL)
+			EOF
+			;;
+		*)
+			cat >expect <<-\EOF
+			(NULL)
+			EOF
+			;;
+		esac &&
+		test-tool config "$op" a.key $file >actual &&
+		test_cmp expect actual
+	'
+}
+
+test_NULL_in_multi "get_value_multi"
+test_NULL_in_multi "configset_get_value" "my.config"
+test_NULL_in_multi "configset_get_value_multi" "my.config"
+
 test_expect_success 'find value from a configset' '
 	cat >config2 <<-\EOF &&
 	[case]
@@ -206,16 +322,16 @@ test_expect_success 'proper error on error in default config files' '
 	cp .git/config .git/config.old &&
 	test_when_finished "mv .git/config.old .git/config" &&
 	echo "[" >>.git/config &&
-	echo "fatal: bad config line 34 in file .git/config" >expect &&
+	echo "fatal: bad config line 36 in file .git/config" >expect &&
 	test_expect_code 128 test-tool config get_value foo.bar 2>actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 test_expect_success 'proper error on error in custom config files' '
 	echo "[" >>syntax-error &&
 	echo "fatal: bad config line 1 in file syntax-error" >expect &&
 	test_expect_code 128 test-tool config configset_get_value foo.bar syntax-error 2>actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 test_expect_success 'check line errors for malformed values' '
@@ -226,14 +342,14 @@ test_expect_success 'check line errors for malformed values' '
 		br
 	EOF
 	test_expect_code 128 git br 2>result &&
-	test_i18ngrep "missing value for .alias\.br" result &&
-	test_i18ngrep "fatal: .*\.git/config" result &&
-	test_i18ngrep "fatal: .*line 2" result
+	test_grep "missing value for .alias\.br" result &&
+	test_grep "fatal: .*\.git/config" result &&
+	test_grep "fatal: .*line 2" result
 '
 
 test_expect_success 'error on modifying repo config without repo' '
 	nongit test_must_fail git config a.b c 2>err &&
-	test_i18ngrep "not in a git directory" err
+	test_grep "not in a git directory" err
 '
 
 cmdline_config="'foo.bar=from-cmdline'"
diff --git a/t/t1309-early-config.sh b/t/t1309-early-config.sh
index ebb8e1a..523aa99 100755
--- a/t/t1309-early-config.sh
+++ b/t/t1309-early-config.sh
@@ -2,6 +2,7 @@
 
 test_description='Test read_early_config()'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'read early config' '
@@ -77,7 +78,7 @@ test_with_config () {
 
 test_expect_success 'ignore .git/ with incompatible repository version' '
 	test_with_config "[core]repositoryformatversion = 999999" 2>err &&
-	test_i18ngrep "warning:.* Expected git repo version <= [1-9]" err
+	test_grep "warning:.* Expected git repo version <= [1-9]" err
 '
 
 test_expect_failure 'ignore .git/ with invalid repository version' '
@@ -91,11 +92,11 @@ test_expect_failure 'ignore .git/ with invalid config' '
 
 test_expect_success 'early config and onbranch' '
 	echo "[broken" >broken &&
-	test_with_config "[includeif \"onbranch:master\"]path=../broken"
+	test_with_config "[includeif \"onbranch:topic\"]path=../broken"
 '
 
 test_expect_success 'onbranch config outside of git repo' '
-	test_config_global includeIf.onbranch:master.path non-existent &&
+	test_config_global includeIf.onbranch:topic.path non-existent &&
 	nongit git help
 '
 
diff --git a/t/t1310-config-default.sh b/t/t1310-config-default.sh
index 6049d91..1a90d31 100755
--- a/t/t1310-config-default.sh
+++ b/t/t1310-config-default.sh
@@ -2,6 +2,7 @@
 
 test_description='Test git config in different settings (with --default)'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'uses --default when entry missing' '
@@ -25,12 +26,12 @@ test_expect_success 'canonicalizes --default with appropriate type' '
 test_expect_success 'dies when --default cannot be parsed' '
 	test_must_fail git config -f config --type=expiry-date --default=x --get \
 		not.a.section 2>error &&
-	test_i18ngrep "failed to format default config value" error
+	test_grep "failed to format default config value" error
 '
 
 test_expect_success 'does not allow --default without --get' '
 	test_must_fail git config --default=quux --unset a.section >output 2>&1 &&
-	test_i18ngrep "\-\-default is only applicable to" output
+	test_grep "\-\-default is only applicable to" output
 '
 
 test_done
diff --git a/t/t1350-config-hooks-path.sh b/t/t1350-config-hooks-path.sh
index f1f9aee..f6dc83e 100755
--- a/t/t1350-config-hooks-path.sh
+++ b/t/t1350-config-hooks-path.sh
@@ -5,11 +5,12 @@ test_description='Test the core.hooksPath configuration variable'
 . ./test-lib.sh
 
 test_expect_success 'set up a pre-commit hook in core.hooksPath' '
-	mkdir -p .git/custom-hooks .git/hooks &&
+	>actual &&
+	mkdir -p .git/custom-hooks &&
 	write_script .git/custom-hooks/pre-commit <<-\EOF &&
 	echo CUSTOM >>actual
 	EOF
-	write_script .git/hooks/pre-commit <<-\EOF
+	test_hook --setup pre-commit <<-\EOF
 	echo NORMAL >>actual
 	EOF
 '
diff --git a/t/t1400-update-ref.sh b/t/t1400-update-ref.sh
index d0d3675..ec3443c 100755
--- a/t/t1400-update-ref.sh
+++ b/t/t1400-update-ref.sh
@@ -8,9 +8,7 @@ test_description='Test git update-ref and basic ref logging'
 
 Z=$ZERO_OID
 
-m=refs/heads/master
-n_dir=refs/heads/gu
-n=$n_dir/fixes
+m=refs/heads/main
 outside=refs/foo
 bare=bare-repo
 
@@ -27,10 +25,11 @@ create_test_commits ()
 }
 
 test_expect_success setup '
+	git checkout --orphan main &&
 	create_test_commits "" &&
 	mkdir $bare &&
 	cd $bare &&
-	git init --bare &&
+	git init --bare -b main &&
 	create_test_commits "bare" &&
 	cd -
 '
@@ -48,23 +47,23 @@ test_expect_success "fail to delete $m with stale ref" '
 	test $B = "$(git show-ref -s --verify $m)"
 '
 test_expect_success "delete $m" '
-	test_when_finished "rm -f .git/$m" &&
+	test_when_finished "git update-ref -d $m" &&
 	git update-ref -d $m $B &&
-	test_path_is_missing .git/$m
+	test_must_fail git show-ref --verify -q $m
 '
 
 test_expect_success "delete $m without oldvalue verification" '
-	test_when_finished "rm -f .git/$m" &&
+	test_when_finished "git update-ref -d $m" &&
 	git update-ref $m $A &&
 	test $A = $(git show-ref -s --verify $m) &&
 	git update-ref -d $m &&
-	test_path_is_missing .git/$m
+	test_must_fail git show-ref --verify -q $m
 '
 
-test_expect_success "fail to create $n" '
-	test_when_finished "rm -f .git/$n_dir" &&
-	touch .git/$n_dir &&
-	test_must_fail git update-ref $n $A
+test_expect_success "fail to create $n due to file/directory conflict" '
+	test_when_finished "git update-ref -d refs/heads/gu" &&
+	git update-ref refs/heads/gu $A &&
+	test_must_fail git update-ref refs/heads/gu/fixes $A
 '
 
 test_expect_success "create $m (by HEAD)" '
@@ -80,27 +79,29 @@ test_expect_success "fail to delete $m (by HEAD) with stale ref" '
 	test $B = $(git show-ref -s --verify $m)
 '
 test_expect_success "delete $m (by HEAD)" '
-	test_when_finished "rm -f .git/$m" &&
+	test_when_finished "git update-ref -d $m" &&
 	git update-ref -d HEAD $B &&
-	test_path_is_missing .git/$m
+	test_must_fail git show-ref --verify -q $m
 '
 
 test_expect_success "deleting current branch adds message to HEAD's log" '
-	test_when_finished "rm -f .git/$m" &&
+	test_when_finished "git update-ref -d $m" &&
 	git update-ref $m $A &&
 	git symbolic-ref HEAD $m &&
 	git update-ref -m delete-$m -d $m &&
-	test_path_is_missing .git/$m &&
-	grep "delete-$m$" .git/logs/HEAD
+	test_must_fail git show-ref --verify -q $m &&
+	test-tool ref-store main for-each-reflog-ent HEAD >actual &&
+	grep "delete-$m$" actual
 '
 
 test_expect_success "deleting by HEAD adds message to HEAD's log" '
-	test_when_finished "rm -f .git/$m" &&
+	test_when_finished "git update-ref -d $m" &&
 	git update-ref $m $A &&
 	git symbolic-ref HEAD $m &&
 	git update-ref -m delete-by-head -d HEAD &&
-	test_path_is_missing .git/$m &&
-	grep "delete-by-head$" .git/logs/HEAD
+	test_must_fail git show-ref --verify -q $m &&
+	test-tool ref-store main for-each-reflog-ent HEAD >actual &&
+	grep "delete-by-head$" actual
 '
 
 test_expect_success 'update-ref does not create reflogs by default' '
@@ -131,7 +132,7 @@ test_expect_success 'creates no reflog in bare repository' '
 
 test_expect_success 'core.logAllRefUpdates=true creates reflog in bare repository' '
 	test_when_finished "git -C $bare config --unset core.logAllRefUpdates && \
-		rm $bare/logs/$m" &&
+		test-tool ref-store main delete-reflog $m" &&
 	git -C $bare config core.logAllRefUpdates true &&
 	git -C $bare update-ref $m $bareB &&
 	git -C $bare rev-parse $bareB >expect &&
@@ -160,10 +161,10 @@ test_expect_success 'core.logAllRefUpdates=always creates reflog by default' '
 	git reflog exists $outside
 '
 
-test_expect_success 'core.logAllRefUpdates=always creates no reflog for ORIG_HEAD' '
+test_expect_success 'core.logAllRefUpdates=always creates reflog for ORIG_HEAD' '
 	test_config core.logAllRefUpdates always &&
 	git update-ref ORIG_HEAD $A &&
-	test_must_fail git reflog exists ORIG_HEAD
+	git reflog exists ORIG_HEAD
 '
 
 test_expect_success '--no-create-reflog overrides core.logAllRefUpdates=always' '
@@ -188,63 +189,69 @@ test_expect_success "move $m (by HEAD)" '
 	test $B = $(git show-ref -s --verify $m)
 '
 test_expect_success "delete $m (by HEAD) should remove both packed and loose $m" '
-	test_when_finished "rm -f .git/$m" &&
+	test_when_finished "git update-ref -d $m" &&
 	git update-ref -d HEAD $B &&
 	! grep "$m" .git/packed-refs &&
-	test_path_is_missing .git/$m
+	test_must_fail git show-ref --verify -q $m
 '
 
-cp -f .git/HEAD .git/HEAD.orig
 test_expect_success 'delete symref without dereference' '
-	test_when_finished "cp -f .git/HEAD.orig .git/HEAD" &&
-	git update-ref --no-deref -d HEAD &&
-	test_path_is_missing .git/HEAD
+	test_when_finished "git update-ref -d $m" &&
+	echo foo >foo.c &&
+	git add foo.c &&
+	git commit -m foo &&
+	git symbolic-ref SYMREF $m &&
+	git update-ref --no-deref -d SYMREF &&
+	git show-ref --verify -q $m &&
+	test_must_fail git show-ref --verify -q SYMREF &&
+	test_must_fail git symbolic-ref SYMREF
 '
 
 test_expect_success 'delete symref without dereference when the referred ref is packed' '
-	test_when_finished "cp -f .git/HEAD.orig .git/HEAD" &&
+	test_when_finished "git update-ref -d $m" &&
 	echo foo >foo.c &&
 	git add foo.c &&
 	git commit -m foo &&
+	git symbolic-ref SYMREF $m &&
 	git pack-refs --all &&
-	git update-ref --no-deref -d HEAD &&
-	test_path_is_missing .git/HEAD
+	git update-ref --no-deref -d SYMREF &&
+	git show-ref --verify -q $m &&
+	test_must_fail git show-ref --verify -q SYMREF &&
+	test_must_fail git symbolic-ref SYMREF
 '
 
-git update-ref -d $m
-
 test_expect_success 'update-ref -d is not confused by self-reference' '
+	test_when_finished "test-tool ref-store main delete-refs REF_NO_DEREF refs/heads/self" &&
 	git symbolic-ref refs/heads/self refs/heads/self &&
-	test_when_finished "rm -f .git/refs/heads/self" &&
-	test_path_is_file .git/refs/heads/self &&
+	git symbolic-ref --no-recurse refs/heads/self &&
 	test_must_fail git update-ref -d refs/heads/self &&
-	test_path_is_file .git/refs/heads/self
+	git symbolic-ref --no-recurse refs/heads/self
 '
 
 test_expect_success 'update-ref --no-deref -d can delete self-reference' '
+	test_when_finished "test-tool ref-store main delete-refs REF_NO_DEREF refs/heads/self" &&
 	git symbolic-ref refs/heads/self refs/heads/self &&
-	test_when_finished "rm -f .git/refs/heads/self" &&
-	test_path_is_file .git/refs/heads/self &&
+	git symbolic-ref --no-recurse refs/heads/self &&
 	git update-ref --no-deref -d refs/heads/self &&
-	test_path_is_missing .git/refs/heads/self
+	test_must_fail git show-ref --verify -q refs/heads/self
 '
 
-test_expect_success 'update-ref --no-deref -d can delete reference to bad ref' '
+test_expect_success REFFILES 'update-ref --no-deref -d can delete reference to bad ref' '
 	>.git/refs/heads/bad &&
 	test_when_finished "rm -f .git/refs/heads/bad" &&
 	git symbolic-ref refs/heads/ref-to-bad refs/heads/bad &&
-	test_when_finished "rm -f .git/refs/heads/ref-to-bad" &&
-	test_path_is_file .git/refs/heads/ref-to-bad &&
+	test_when_finished "git update-ref -d refs/heads/ref-to-bad" &&
+	git symbolic-ref --no-recurse refs/heads/ref-to-bad &&
 	git update-ref --no-deref -d refs/heads/ref-to-bad &&
-	test_path_is_missing .git/refs/heads/ref-to-bad
+	test_must_fail git show-ref --verify -q refs/heads/ref-to-bad
 '
 
 test_expect_success '(not) create HEAD with old sha1' '
 	test_must_fail git update-ref HEAD $A $B
 '
 test_expect_success "(not) prior created .git/$m" '
-	test_when_finished "rm -f .git/$m" &&
-	test_path_is_missing .git/$m
+	test_when_finished "git update-ref -d $m" &&
+	test_must_fail git show-ref --verify -q $m
 '
 
 test_expect_success 'create HEAD' '
@@ -254,11 +261,14 @@ test_expect_success '(not) change HEAD with wrong SHA1' '
 	test_must_fail git update-ref HEAD $B $Z
 '
 test_expect_success "(not) changed .git/$m" '
-	test_when_finished "rm -f .git/$m" &&
+	test_when_finished "git update-ref -d $m" &&
 	! test $B = $(git show-ref -s --verify $m)
 '
 
-rm -f .git/logs/refs/heads/master
+test_expect_success "clean up reflog" '
+	test-tool ref-store main delete-reflog $m
+'
+
 test_expect_success "create $m (logged by touch)" '
 	test_config core.logAllRefUpdates false &&
 	GIT_COMMITTER_DATE="2005-05-26 23:30" \
@@ -278,41 +288,15 @@ test_expect_success "set $m (logged by touch)" '
 	test $A = $(git show-ref -s --verify $m)
 '
 
-test_expect_success 'empty directory removal' '
-	git branch d1/d2/r1 HEAD &&
-	git branch d1/r2 HEAD &&
-	test_path_is_file .git/refs/heads/d1/d2/r1 &&
-	test_path_is_file .git/logs/refs/heads/d1/d2/r1 &&
-	git branch -d d1/d2/r1 &&
-	test_path_is_missing .git/refs/heads/d1/d2 &&
-	test_path_is_missing .git/logs/refs/heads/d1/d2 &&
-	test_path_is_file .git/refs/heads/d1/r2 &&
-	test_path_is_file .git/logs/refs/heads/d1/r2
-'
-
-test_expect_success 'symref empty directory removal' '
-	git branch e1/e2/r1 HEAD &&
-	git branch e1/r2 HEAD &&
-	git checkout e1/e2/r1 &&
-	test_when_finished "git checkout master" &&
-	test_path_is_file .git/refs/heads/e1/e2/r1 &&
-	test_path_is_file .git/logs/refs/heads/e1/e2/r1 &&
-	git update-ref -d HEAD &&
-	test_path_is_missing .git/refs/heads/e1/e2 &&
-	test_path_is_missing .git/logs/refs/heads/e1/e2 &&
-	test_path_is_file .git/refs/heads/e1/r2 &&
-	test_path_is_file .git/logs/refs/heads/e1/r2 &&
-	test_path_is_file .git/logs/HEAD
-'
-
 cat >expect <<EOF
 $Z $A $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> 1117150200 +0000	Initial Creation
 $A $B $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> 1117150260 +0000	Switch
 $B $A $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> 1117150860 +0000
 EOF
 test_expect_success "verifying $m's log (logged by touch)" '
-	test_when_finished "rm -rf .git/$m .git/logs expect" &&
-	test_cmp expect .git/logs/$m
+	test_when_finished "git update-ref -d $m && git reflog expire --expire=all --all && rm -rf actual expect" &&
+	test-tool ref-store main for-each-reflog-ent $m >actual &&
+	test_cmp actual expect
 '
 
 test_expect_success "create $m (logged by config)" '
@@ -340,92 +324,123 @@ $A $B $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> 1117150380 +0000	Switch
 $B $A $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> 1117150980 +0000
 EOF
 test_expect_success "verifying $m's log (logged by config)" '
-	test_when_finished "rm -f .git/$m .git/logs/$m expect" &&
-	test_cmp expect .git/logs/$m
+	test_when_finished "git update-ref -d $m && git reflog expire --expire=all --all && rm -rf actual expect" &&
+	test-tool ref-store main for-each-reflog-ent $m >actual &&
+	test_cmp actual expect
 '
 
 test_expect_success 'set up for querying the reflog' '
+	git update-ref -d $m &&
+	test-tool ref-store main delete-reflog $m &&
+
+	GIT_COMMITTER_DATE="1117150320 -0500" git update-ref $m $C &&
+	GIT_COMMITTER_DATE="1117150350 -0500" git update-ref $m $A &&
+	GIT_COMMITTER_DATE="1117150380 -0500" git update-ref $m $B &&
+	GIT_COMMITTER_DATE="1117150680 -0500" git update-ref $m $F &&
+	GIT_COMMITTER_DATE="1117150980 -0500" git update-ref $m $E &&
 	git update-ref $m $D &&
-	cat >.git/logs/$m <<-EOF
+	# Delete the last reflog entry so that the tip of m and the reflog for
+	# it disagree.
+	git reflog delete $m@{0} &&
+
+	cat >expect <<-EOF &&
 	$Z $C $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> 1117150320 -0500
 	$C $A $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> 1117150350 -0500
 	$A $B $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> 1117150380 -0500
-	$F $Z $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> 1117150680 -0500
-	$Z $E $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> 1117150980 -0500
+	$B $F $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> 1117150680 -0500
+	$F $E $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> 1117150980 -0500
 	EOF
+	test-tool ref-store main for-each-reflog-ent $m >actual &&
+	test_cmp expect actual
 '
 
 ed="Thu, 26 May 2005 18:32:00 -0500"
 gd="Thu, 26 May 2005 18:33:00 -0500"
 ld="Thu, 26 May 2005 18:43:00 -0500"
-test_expect_success 'Query "master@{May 25 2005}" (before history)' '
+test_expect_success 'Query "main@{May 25 2005}" (before history)' '
 	test_when_finished "rm -f o e" &&
-	git rev-parse --verify "master@{May 25 2005}" >o 2>e &&
+	git rev-parse --verify "main@{May 25 2005}" >o 2>e &&
 	echo "$C" >expect &&
 	test_cmp expect o &&
-	echo "warning: log for '\''master'\'' only goes back to $ed" >expect &&
-	test_i18ncmp expect e
+	echo "warning: log for '\''main'\'' only goes back to $ed" >expect &&
+	test_cmp expect e
 '
-test_expect_success 'Query master@{2005-05-25} (before history)' '
+test_expect_success 'Query main@{2005-05-25} (before history)' '
 	test_when_finished "rm -f o e" &&
-	git rev-parse --verify master@{2005-05-25} >o 2>e &&
+	git rev-parse --verify main@{2005-05-25} >o 2>e &&
 	echo "$C" >expect &&
 	test_cmp expect o &&
-	echo "warning: log for '\''master'\'' only goes back to $ed" >expect &&
-	test_i18ncmp expect e
+	echo "warning: log for '\''main'\'' only goes back to $ed" >expect &&
+	test_cmp expect e
 '
-test_expect_success 'Query "master@{May 26 2005 23:31:59}" (1 second before history)' '
+test_expect_success 'Query "main@{May 26 2005 23:31:59}" (1 second before history)' '
 	test_when_finished "rm -f o e" &&
-	git rev-parse --verify "master@{May 26 2005 23:31:59}" >o 2>e &&
+	git rev-parse --verify "main@{May 26 2005 23:31:59}" >o 2>e &&
 	echo "$C" >expect &&
 	test_cmp expect o &&
-	echo "warning: log for '\''master'\'' only goes back to $ed" >expect &&
-	test_i18ncmp expect e
+	echo "warning: log for '\''main'\'' only goes back to $ed" >expect &&
+	test_cmp expect e
 '
-test_expect_success 'Query "master@{May 26 2005 23:32:00}" (exactly history start)' '
+test_expect_success 'Query "main@{May 26 2005 23:32:00}" (exactly history start)' '
 	test_when_finished "rm -f o e" &&
-	git rev-parse --verify "master@{May 26 2005 23:32:00}" >o 2>e &&
+	git rev-parse --verify "main@{May 26 2005 23:32:00}" >o 2>e &&
 	echo "$C" >expect &&
 	test_cmp expect o &&
 	test_must_be_empty e
 '
-test_expect_success 'Query "master@{May 26 2005 23:32:30}" (first non-creation change)' '
+test_expect_success 'Query "main@{May 26 2005 23:32:30}" (first non-creation change)' '
 	test_when_finished "rm -f o e" &&
-	git rev-parse --verify "master@{May 26 2005 23:32:30}" >o 2>e &&
+	git rev-parse --verify "main@{May 26 2005 23:32:30}" >o 2>e &&
 	echo "$A" >expect &&
 	test_cmp expect o &&
 	test_must_be_empty e
 '
-test_expect_success 'Query "master@{2005-05-26 23:33:01}" (middle of history with gap)' '
+test_expect_success 'Query "main@{2005-05-26 23:33:01}" (middle of history with gap)' '
 	test_when_finished "rm -f o e" &&
-	git rev-parse --verify "master@{2005-05-26 23:33:01}" >o 2>e &&
+	git rev-parse --verify "main@{2005-05-26 23:33:01}" >o 2>e &&
 	echo "$B" >expect &&
-	test_cmp expect o &&
-	test_i18ngrep -F "warning: log for ref $m has gap after $gd" e
+	test_cmp expect o
 '
-test_expect_success 'Query "master@{2005-05-26 23:38:00}" (middle of history)' '
+test_expect_success 'Query "main@{2005-05-26 23:38:00}" (middle of history)' '
 	test_when_finished "rm -f o e" &&
-	git rev-parse --verify "master@{2005-05-26 23:38:00}" >o 2>e &&
-	echo "$Z" >expect &&
+	git rev-parse --verify "main@{2005-05-26 23:38:00}" >o 2>e &&
+	echo "$F" >expect &&
 	test_cmp expect o &&
 	test_must_be_empty e
 '
-test_expect_success 'Query "master@{2005-05-26 23:43:00}" (exact end of history)' '
+test_expect_success 'Query "main@{2005-05-26 23:43:00}" (exact end of history)' '
 	test_when_finished "rm -f o e" &&
-	git rev-parse --verify "master@{2005-05-26 23:43:00}" >o 2>e &&
+	git rev-parse --verify "main@{2005-05-26 23:43:00}" >o 2>e &&
 	echo "$E" >expect &&
 	test_cmp expect o &&
 	test_must_be_empty e
 '
-test_expect_success 'Query "master@{2005-05-28}" (past end of history)' '
+test_expect_success 'Query "main@{2005-05-28}" (past end of history)' '
 	test_when_finished "rm -f o e" &&
-	git rev-parse --verify "master@{2005-05-28}" >o 2>e &&
+	git rev-parse --verify "main@{2005-05-28}" >o 2>e &&
 	echo "$D" >expect &&
 	test_cmp expect o &&
-	test_i18ngrep -F "warning: log for ref $m unexpectedly ended on $ld" e
+	test_grep -F "warning: log for ref $m unexpectedly ended on $ld" e
 '
 
-rm -f .git/$m .git/logs/$m expect
+rm -f expect
+git update-ref -d $m
+
+test_expect_success 'query reflog with gap' '
+	test_when_finished "git update-ref -d $m" &&
+
+	GIT_COMMITTER_DATE="1117150320 -0500" git update-ref $m $A &&
+	GIT_COMMITTER_DATE="1117150380 -0500" git update-ref $m $B &&
+	GIT_COMMITTER_DATE="1117150480 -0500" git update-ref $m $C &&
+	GIT_COMMITTER_DATE="1117150580 -0500" git update-ref $m $D &&
+	GIT_COMMITTER_DATE="1117150680 -0500" git update-ref $m $F &&
+	git reflog delete $m@{2} &&
+
+	git rev-parse --verify "main@{2005-05-26 23:33:01}" >actual 2>stderr &&
+	echo "$B" >expect &&
+	test_cmp expect actual &&
+	test_grep -F "warning: log for ref $m has gap after $gd" stderr
+'
 
 test_expect_success 'creating initial files' '
 	test_when_finished rm -f M &&
@@ -457,76 +472,77 @@ $h_OTHER $h_FIXED $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> 1117151040 +0000	co
 $h_FIXED $h_MERGED $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> 1117151100 +0000	commit (merge): Merged initial commit and a later commit.
 EOF
 test_expect_success 'git commit logged updates' '
-	test_cmp expect .git/logs/$m
+	test-tool ref-store main for-each-reflog-ent $m >actual &&
+	test_cmp expect actual
 '
 unset h_TEST h_OTHER h_FIXED h_MERGED
 
-test_expect_success 'git cat-file blob master:F (expect OTHER)' '
-	test OTHER = $(git cat-file blob master:F)
+test_expect_success 'git cat-file blob main:F (expect OTHER)' '
+	test OTHER = $(git cat-file blob main:F)
 '
-test_expect_success 'git cat-file blob master@{2005-05-26 23:30}:F (expect TEST)' '
-	test TEST = $(git cat-file blob "master@{2005-05-26 23:30}:F")
+test_expect_success 'git cat-file blob main@{2005-05-26 23:30}:F (expect TEST)' '
+	test TEST = $(git cat-file blob "main@{2005-05-26 23:30}:F")
 '
-test_expect_success 'git cat-file blob master@{2005-05-26 23:42}:F (expect OTHER)' '
-	test OTHER = $(git cat-file blob "master@{2005-05-26 23:42}:F")
+test_expect_success 'git cat-file blob main@{2005-05-26 23:42}:F (expect OTHER)' '
+	test OTHER = $(git cat-file blob "main@{2005-05-26 23:42}:F")
 '
 
 # Test adding and deleting pseudorefs
 
 test_expect_success 'given old value for missing pseudoref, do not create' '
 	test_must_fail git update-ref PSEUDOREF $A $B 2>err &&
-	test_path_is_missing .git/PSEUDOREF &&
-	test_i18ngrep "could not read ref" err
+	test_must_fail git rev-parse PSEUDOREF &&
+	test_grep "unable to resolve reference" err
 '
 
 test_expect_success 'create pseudoref' '
 	git update-ref PSEUDOREF $A &&
-	test $A = $(cat .git/PSEUDOREF)
+	test $A = $(git show-ref -s --verify PSEUDOREF)
 '
 
 test_expect_success 'overwrite pseudoref with no old value given' '
 	git update-ref PSEUDOREF $B &&
-	test $B = $(cat .git/PSEUDOREF)
+	test $B = $(git show-ref -s --verify PSEUDOREF)
 '
 
 test_expect_success 'overwrite pseudoref with correct old value' '
 	git update-ref PSEUDOREF $C $B &&
-	test $C = $(cat .git/PSEUDOREF)
+	test $C = $(git show-ref -s --verify PSEUDOREF)
 '
 
 test_expect_success 'do not overwrite pseudoref with wrong old value' '
 	test_must_fail git update-ref PSEUDOREF $D $E 2>err &&
-	test $C = $(cat .git/PSEUDOREF) &&
-	test_i18ngrep "unexpected object ID" err
+	test $C = $(git show-ref -s --verify PSEUDOREF) &&
+	test_grep "cannot lock ref.*expected" err
 '
 
 test_expect_success 'delete pseudoref' '
 	git update-ref -d PSEUDOREF &&
-	test_path_is_missing .git/PSEUDOREF
+	test_must_fail git show-ref -s --verify PSEUDOREF
 '
 
 test_expect_success 'do not delete pseudoref with wrong old value' '
 	git update-ref PSEUDOREF $A &&
 	test_must_fail git update-ref -d PSEUDOREF $B 2>err &&
-	test $A = $(cat .git/PSEUDOREF) &&
-	test_i18ngrep "unexpected object ID" err
+	test $A = $(git show-ref -s --verify PSEUDOREF) &&
+	test_grep "cannot lock ref.*expected" err
 '
 
 test_expect_success 'delete pseudoref with correct old value' '
 	git update-ref -d PSEUDOREF $A &&
-	test_path_is_missing .git/PSEUDOREF
+	test_must_fail git show-ref -s --verify PSEUDOREF
 '
 
 test_expect_success 'create pseudoref with old OID zero' '
 	git update-ref PSEUDOREF $A $Z &&
-	test $A = $(cat .git/PSEUDOREF)
+	test $A = $(git show-ref -s --verify PSEUDOREF)
 '
 
 test_expect_success 'do not overwrite pseudoref with old OID zero' '
 	test_when_finished git update-ref -d PSEUDOREF &&
 	test_must_fail git update-ref PSEUDOREF $B $Z 2>err &&
-	test $A = $(cat .git/PSEUDOREF) &&
-	test_i18ngrep "already exists" err
+	test $A = $(git show-ref -s --verify PSEUDOREF) &&
+	test_grep "already exists" err
 '
 
 # Test --stdin
@@ -546,7 +562,7 @@ test_expect_success 'stdin test setup' '
 
 test_expect_success '-z fails without --stdin' '
 	test_must_fail git update-ref -z $m $m $m 2>err &&
-	test_i18ngrep "usage: git update-ref" err
+	test_grep "usage: git update-ref" err
 '
 
 test_expect_success 'stdin works with no input' '
@@ -580,21 +596,21 @@ test_expect_success 'stdin fails on unknown command' '
 '
 
 test_expect_success 'stdin fails on unbalanced quotes' '
-	echo "create $a \"master" >stdin &&
+	echo "create $a \"main" >stdin &&
 	test_must_fail git update-ref --stdin <stdin 2>err &&
-	grep "fatal: badly quoted argument: \\\"master" err
+	grep "fatal: badly quoted argument: \\\"main" err
 '
 
 test_expect_success 'stdin fails on invalid escape' '
-	echo "create $a \"ma\zter\"" >stdin &&
+	echo "create $a \"ma\zn\"" >stdin &&
 	test_must_fail git update-ref --stdin <stdin 2>err &&
-	grep "fatal: badly quoted argument: \\\"ma\\\\zter\\\"" err
+	grep "fatal: badly quoted argument: \\\"ma\\\\zn\\\"" err
 '
 
 test_expect_success 'stdin fails on junk after quoted argument' '
-	echo "create \"$a\"master" >stdin &&
+	echo "create \"$a\"main" >stdin &&
 	test_must_fail git update-ref --stdin <stdin 2>err &&
-	grep "fatal: unexpected character after quoted argument: \\\"$a\\\"master" err
+	grep "fatal: unexpected character after quoted argument: \\\"$a\\\"main" err
 '
 
 test_expect_success 'stdin fails create with no ref' '
@@ -606,7 +622,7 @@ test_expect_success 'stdin fails create with no ref' '
 test_expect_success 'stdin fails create with no new value' '
 	echo "create $a" >stdin &&
 	test_must_fail git update-ref --stdin <stdin 2>err &&
-	grep "fatal: create $a: missing <newvalue>" err
+	grep "fatal: create $a: missing <new-oid>" err
 '
 
 test_expect_success 'stdin fails create with too many arguments' '
@@ -624,7 +640,7 @@ test_expect_success 'stdin fails update with no ref' '
 test_expect_success 'stdin fails update with no new value' '
 	echo "update $a" >stdin &&
 	test_must_fail git update-ref --stdin <stdin 2>err &&
-	grep "fatal: update $a: missing <newvalue>" err
+	grep "fatal: update $a: missing <new-oid>" err
 '
 
 test_expect_success 'stdin fails update with too many arguments' '
@@ -664,7 +680,7 @@ test_expect_success 'stdin fails with duplicate refs' '
 	create $a $m
 	EOF
 	test_must_fail git update-ref --stdin <stdin 2>err &&
-	test_i18ngrep "fatal: multiple updates for ref '"'"'$a'"'"' not allowed" err
+	test_grep "fatal: multiple updates for ref '"'"'$a'"'"' not allowed" err
 '
 
 test_expect_success 'stdin create ref works' '
@@ -706,7 +722,7 @@ test_expect_success 'stdin succeeds with quoted argument' '
 
 test_expect_success 'stdin succeeds with escaped character' '
 	git update-ref -d $a &&
-	echo "create $a \"ma\\163ter\"" >stdin &&
+	echo "create $a \"ma\\151n\"" >stdin &&
 	git update-ref --stdin <stdin &&
 	git rev-parse $m >expect &&
 	git rev-parse $a >actual &&
@@ -749,21 +765,21 @@ test_expect_success 'stdin update ref fails with wrong old value' '
 test_expect_success 'stdin update ref fails with bad old value' '
 	echo "update $c $m does-not-exist" >stdin &&
 	test_must_fail git update-ref --stdin <stdin 2>err &&
-	grep "fatal: update $c: invalid <oldvalue>: does-not-exist" err &&
+	grep "fatal: update $c: invalid <old-oid>: does-not-exist" err &&
 	test_must_fail git rev-parse --verify -q $c
 '
 
 test_expect_success 'stdin create ref fails with bad new value' '
 	echo "create $c does-not-exist" >stdin &&
 	test_must_fail git update-ref --stdin <stdin 2>err &&
-	grep "fatal: create $c: invalid <newvalue>: does-not-exist" err &&
+	grep "fatal: create $c: invalid <new-oid>: does-not-exist" err &&
 	test_must_fail git rev-parse --verify -q $c
 '
 
 test_expect_success 'stdin create ref fails with zero new value' '
 	echo "create $c " >stdin &&
 	test_must_fail git update-ref --stdin <stdin 2>err &&
-	grep "fatal: create $c: zero <newvalue>" err &&
+	grep "fatal: create $c: zero <new-oid>" err &&
 	test_must_fail git rev-parse --verify -q $c
 '
 
@@ -787,7 +803,7 @@ test_expect_success 'stdin delete ref fails with wrong old value' '
 test_expect_success 'stdin delete ref fails with zero old value' '
 	echo "delete $a " >stdin &&
 	test_must_fail git update-ref --stdin <stdin 2>err &&
-	grep "fatal: delete $a: zero <oldvalue>" err &&
+	grep "fatal: delete $a: zero <old-oid>" err &&
 	git rev-parse $m >expect &&
 	git rev-parse $a >actual &&
 	test_cmp expect actual
@@ -1011,7 +1027,7 @@ test_expect_success 'stdin -z fails create with no ref' '
 test_expect_success 'stdin -z fails create with no new value' '
 	printf $F "create $a" >stdin &&
 	test_must_fail git update-ref -z --stdin <stdin 2>err &&
-	grep "fatal: create $a: unexpected end of input when reading <newvalue>" err
+	grep "fatal: create $a: unexpected end of input when reading <new-oid>" err
 '
 
 test_expect_success 'stdin -z fails create with too many arguments' '
@@ -1029,27 +1045,27 @@ test_expect_success 'stdin -z fails update with no ref' '
 test_expect_success 'stdin -z fails update with too few args' '
 	printf $F "update $a" "$m" >stdin &&
 	test_must_fail git update-ref -z --stdin <stdin 2>err &&
-	grep "fatal: update $a: unexpected end of input when reading <oldvalue>" err
+	grep "fatal: update $a: unexpected end of input when reading <old-oid>" err
 '
 
 test_expect_success 'stdin -z emits warning with empty new value' '
 	git update-ref $a $m &&
 	printf $F "update $a" "" "" >stdin &&
 	git update-ref -z --stdin <stdin 2>err &&
-	grep "warning: update $a: missing <newvalue>, treating as zero" err &&
+	grep "warning: update $a: missing <new-oid>, treating as zero" err &&
 	test_must_fail git rev-parse --verify -q $a
 '
 
 test_expect_success 'stdin -z fails update with no new value' '
 	printf $F "update $a" >stdin &&
 	test_must_fail git update-ref -z --stdin <stdin 2>err &&
-	grep "fatal: update $a: unexpected end of input when reading <newvalue>" err
+	grep "fatal: update $a: unexpected end of input when reading <new-oid>" err
 '
 
 test_expect_success 'stdin -z fails update with no old value' '
 	printf $F "update $a" "$m" >stdin &&
 	test_must_fail git update-ref -z --stdin <stdin 2>err &&
-	grep "fatal: update $a: unexpected end of input when reading <oldvalue>" err
+	grep "fatal: update $a: unexpected end of input when reading <old-oid>" err
 '
 
 test_expect_success 'stdin -z fails update with too many arguments' '
@@ -1067,7 +1083,7 @@ test_expect_success 'stdin -z fails delete with no ref' '
 test_expect_success 'stdin -z fails delete with no old value' '
 	printf $F "delete $a" >stdin &&
 	test_must_fail git update-ref -z --stdin <stdin 2>err &&
-	grep "fatal: delete $a: unexpected end of input when reading <oldvalue>" err
+	grep "fatal: delete $a: unexpected end of input when reading <old-oid>" err
 '
 
 test_expect_success 'stdin -z fails delete with too many arguments' '
@@ -1085,7 +1101,7 @@ test_expect_success 'stdin -z fails verify with too many arguments' '
 test_expect_success 'stdin -z fails verify with no old value' '
 	printf $F "verify $a" >stdin &&
 	test_must_fail git update-ref -z --stdin <stdin 2>err &&
-	grep "fatal: verify $a: unexpected end of input when reading <oldvalue>" err
+	grep "fatal: verify $a: unexpected end of input when reading <old-oid>" err
 '
 
 test_expect_success 'stdin -z fails option with unknown name' '
@@ -1097,7 +1113,7 @@ test_expect_success 'stdin -z fails option with unknown name' '
 test_expect_success 'stdin -z fails with duplicate refs' '
 	printf $F "create $a" "$m" "create $b" "$m" "create $a" "$m" >stdin &&
 	test_must_fail git update-ref -z --stdin <stdin 2>err &&
-	test_i18ngrep "fatal: multiple updates for ref '"'"'$a'"'"' not allowed" err
+	test_grep "fatal: multiple updates for ref '"'"'$a'"'"' not allowed" err
 '
 
 test_expect_success 'stdin -z create ref works' '
@@ -1144,7 +1160,7 @@ test_expect_success 'stdin -z update ref fails with wrong old value' '
 test_expect_success 'stdin -z update ref fails with bad old value' '
 	printf $F "update $c" "$m" "does-not-exist" >stdin &&
 	test_must_fail git update-ref -z --stdin <stdin 2>err &&
-	grep "fatal: update $c: invalid <oldvalue>: does-not-exist" err &&
+	grep "fatal: update $c: invalid <old-oid>: does-not-exist" err &&
 	test_must_fail git rev-parse --verify -q $c
 '
 
@@ -1162,14 +1178,14 @@ test_expect_success 'stdin -z create ref fails with bad new value' '
 	git update-ref -d "$c" &&
 	printf $F "create $c" "does-not-exist" >stdin &&
 	test_must_fail git update-ref -z --stdin <stdin 2>err &&
-	grep "fatal: create $c: invalid <newvalue>: does-not-exist" err &&
+	grep "fatal: create $c: invalid <new-oid>: does-not-exist" err &&
 	test_must_fail git rev-parse --verify -q $c
 '
 
 test_expect_success 'stdin -z create ref fails with empty new value' '
 	printf $F "create $c" "" >stdin &&
 	test_must_fail git update-ref -z --stdin <stdin 2>err &&
-	grep "fatal: create $c: missing <newvalue>" err &&
+	grep "fatal: create $c: missing <new-oid>" err &&
 	test_must_fail git rev-parse --verify -q $c
 '
 
@@ -1193,7 +1209,7 @@ test_expect_success 'stdin -z delete ref fails with wrong old value' '
 test_expect_success 'stdin -z delete ref fails with zero old value' '
 	printf $F "delete $a" "$Z" >stdin &&
 	test_must_fail git update-ref -z --stdin <stdin 2>err &&
-	grep "fatal: delete $a: zero <oldvalue>" err &&
+	grep "fatal: delete $a: zero <old-oid>" err &&
 	git rev-parse $m >expect &&
 	git rev-parse $a >actual &&
 	test_cmp expect actual
@@ -1328,7 +1344,7 @@ test_expect_success 'fails with duplicate HEAD update' '
 	update HEAD $B
 	EOF
 	test_must_fail git update-ref --stdin <stdin 2>err &&
-	test_i18ngrep "fatal: multiple updates for '\''HEAD'\'' (including one via its referent .refs/heads/target1.) are not allowed" err &&
+	test_grep "fatal: multiple updates for '\''HEAD'\'' (including one via its referent .refs/heads/target1.) are not allowed" err &&
 	echo "refs/heads/target1" >expect &&
 	git symbolic-ref HEAD >actual &&
 	test_cmp expect actual &&
@@ -1345,7 +1361,7 @@ test_expect_success 'fails with duplicate ref update via symref' '
 	update refs/heads/symref2 $B
 	EOF
 	test_must_fail git update-ref --stdin <stdin 2>err &&
-	test_i18ngrep "fatal: multiple updates for '\''refs/heads/target2'\'' (including one via symref .refs/heads/symref2.) are not allowed" err &&
+	test_grep "fatal: multiple updates for '\''refs/heads/target2'\'' (including one via symref .refs/heads/symref2.) are not allowed" err &&
 	echo "refs/heads/target2" >expect &&
 	git symbolic-ref refs/heads/symref2 >actual &&
 	test_cmp expect actual &&
@@ -1358,7 +1374,7 @@ test_expect_success ULIMIT_FILE_DESCRIPTORS 'large transaction creating branches
 (
 	for i in $(test_seq 33)
 	do
-		echo "create refs/heads/$i HEAD"
+		echo "create refs/heads/$i HEAD" || exit 1
 	done >large_input &&
 	run_with_limited_open_files git update-ref --stdin <large_input &&
 	git rev-parse --verify -q refs/heads/33
@@ -1369,7 +1385,7 @@ test_expect_success ULIMIT_FILE_DESCRIPTORS 'large transaction deleting branches
 (
 	for i in $(test_seq 33)
 	do
-		echo "delete refs/heads/$i HEAD"
+		echo "delete refs/heads/$i HEAD" || exit 1
 	done >large_input &&
 	run_with_limited_open_files git update-ref --stdin <large_input &&
 	test_must_fail git rev-parse --verify -q refs/heads/33
@@ -1388,7 +1404,8 @@ test_expect_success 'handle per-worktree refs in refs/bisect' '
 		git rev-parse refs/bisect/something >../worktree-head &&
 		git for-each-ref | grep refs/bisect/something
 	) &&
-	test_path_is_missing .git/refs/bisect &&
+	git show-ref >actual &&
+	! grep 'refs/bisect' actual &&
 	test_must_fail git rev-parse refs/bisect/something &&
 	git update-ref refs/bisect/something HEAD &&
 	git rev-parse refs/bisect/something >main-head &&
@@ -1500,7 +1517,7 @@ test_expect_success 'transaction can handle abort' '
 	git update-ref --stdin <stdin >actual &&
 	printf "%s: ok\n" start abort >expect &&
 	test_cmp expect actual &&
-	test_path_is_missing .git/$b
+	test_must_fail git show-ref --verify -q $b
 '
 
 test_expect_success 'transaction aborts by default' '
@@ -1511,7 +1528,7 @@ test_expect_success 'transaction aborts by default' '
 	git update-ref --stdin <stdin >actual &&
 	printf "%s: ok\n" start >expect &&
 	test_cmp expect actual &&
-	test_path_is_missing .git/$b
+	test_must_fail git show-ref --verify -q $b
 '
 
 test_expect_success 'transaction with prepare aborts by default' '
@@ -1523,7 +1540,105 @@ test_expect_success 'transaction with prepare aborts by default' '
 	git update-ref --stdin <stdin >actual &&
 	printf "%s: ok\n" start prepare >expect &&
 	test_cmp expect actual &&
-	test_path_is_missing .git/$b
+	test_must_fail git show-ref --verify -q $b
+'
+
+test_expect_success 'transaction can commit multiple times' '
+	cat >stdin <<-EOF &&
+	start
+	create refs/heads/branch-1 $A
+	commit
+	start
+	create refs/heads/branch-2 $B
+	commit
+	EOF
+	git update-ref --stdin <stdin >actual &&
+	printf "%s: ok\n" start commit start commit >expect &&
+	test_cmp expect actual &&
+	echo "$A" >expect &&
+	git rev-parse refs/heads/branch-1 >actual &&
+	test_cmp expect actual &&
+	echo "$B" >expect &&
+	git rev-parse refs/heads/branch-2 >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'transaction can create and delete' '
+	cat >stdin <<-EOF &&
+	start
+	create refs/heads/create-and-delete $A
+	commit
+	start
+	delete refs/heads/create-and-delete $A
+	commit
+	EOF
+	git update-ref --stdin <stdin >actual &&
+	printf "%s: ok\n" start commit start commit >expect &&
+	test_cmp expect actual &&
+	test_must_fail git show-ref --verify refs/heads/create-and-delete
+'
+
+test_expect_success 'transaction can commit after abort' '
+	cat >stdin <<-EOF &&
+	start
+	create refs/heads/abort $A
+	abort
+	start
+	create refs/heads/abort $A
+	commit
+	EOF
+	git update-ref --stdin <stdin >actual &&
+	printf "%s: ok\n" start abort start commit >expect &&
+	echo "$A" >expect &&
+	git rev-parse refs/heads/abort >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'transaction cannot restart ongoing transaction' '
+	cat >stdin <<-EOF &&
+	start
+	create refs/heads/restart $A
+	start
+	commit
+	EOF
+	test_must_fail git update-ref --stdin <stdin >actual &&
+	printf "%s: ok\n" start >expect &&
+	test_cmp expect actual &&
+	test_must_fail git show-ref --verify refs/heads/restart
+'
+
+test_expect_success PIPE 'transaction flushes status updates' '
+	mkfifo in out &&
+	(git update-ref --stdin <in >out &) &&
+
+	exec 9>in &&
+	exec 8<out &&
+	test_when_finished "exec 9>&-" &&
+	test_when_finished "exec 8<&-" &&
+
+	echo "start" >&9 &&
+	echo "start: ok" >expected &&
+	read line <&8 &&
+	echo "$line" >actual &&
+	test_cmp expected actual &&
+
+	echo "create refs/heads/flush $A" >&9 &&
+
+	echo prepare >&9 &&
+	echo "prepare: ok" >expected &&
+	read line <&8 &&
+	echo "$line" >actual &&
+	test_cmp expected actual &&
+
+	# This must now fail given that we have locked the ref.
+	test_must_fail git update-ref refs/heads/flush $B 2>stderr &&
+	grep "fatal: update_ref failed for ref ${SQ}refs/heads/flush${SQ}: cannot lock ref" stderr &&
+
+	echo commit >&9 &&
+	echo "commit: ok" >expected &&
+	read line <&8 &&
+	echo "$line" >actual &&
+	test_cmp expected actual
 '
 
 test_done
diff --git a/t/t1401-symbolic-ref.sh b/t/t1401-symbolic-ref.sh
index a4ebb0b..5c60d6f 100755
--- a/t/t1401-symbolic-ref.sh
+++ b/t/t1401-symbolic-ref.sh
@@ -1,23 +1,27 @@
 #!/bin/sh
 
 test_description='basic symbolic-ref tests'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # If the tests munging HEAD fail, they can break detection of
 # the git repo, meaning that further tests will operate on
 # the surrounding git repo instead of the trash directory.
 reset_to_sane() {
-	echo ref: refs/heads/foo >.git/HEAD
+	rm -rf .git &&
+	"$TAR" xf .git.tar
 }
 
-test_expect_success 'symbolic-ref writes HEAD' '
+test_expect_success 'setup' '
 	git symbolic-ref HEAD refs/heads/foo &&
-	echo ref: refs/heads/foo >expect &&
-	test_cmp expect .git/HEAD
+	test_commit file &&
+	"$TAR" cf .git.tar .git/
 '
 
-test_expect_success 'symbolic-ref reads HEAD' '
-	echo refs/heads/foo >expect &&
+test_expect_success 'symbolic-ref read/write roundtrip' '
+	git symbolic-ref HEAD refs/heads/read-write-roundtrip &&
+	echo refs/heads/read-write-roundtrip >expect &&
 	git symbolic-ref HEAD >actual &&
 	test_cmp expect actual
 '
@@ -25,12 +29,14 @@ test_expect_success 'symbolic-ref reads HEAD' '
 test_expect_success 'symbolic-ref refuses non-ref for HEAD' '
 	test_must_fail git symbolic-ref HEAD foo
 '
+
 reset_to_sane
 
 test_expect_success 'symbolic-ref refuses bare sha1' '
-	echo content >file && git add file && git commit -m one &&
-	test_must_fail git symbolic-ref HEAD $(git rev-parse HEAD)
+	rev=$(git rev-parse HEAD) &&
+	test_must_fail git symbolic-ref HEAD "$rev"
 '
+
 reset_to_sane
 
 test_expect_success 'HEAD cannot be removed' '
@@ -42,16 +48,16 @@ reset_to_sane
 test_expect_success 'symbolic-ref can be deleted' '
 	git symbolic-ref NOTHEAD refs/heads/foo &&
 	git symbolic-ref -d NOTHEAD &&
-	test_path_is_file .git/refs/heads/foo &&
-	test_path_is_missing .git/NOTHEAD
+	git rev-parse refs/heads/foo &&
+	test_must_fail git symbolic-ref NOTHEAD
 '
 reset_to_sane
 
 test_expect_success 'symbolic-ref can delete dangling symref' '
 	git symbolic-ref NOTHEAD refs/heads/missing &&
 	git symbolic-ref -d NOTHEAD &&
-	test_path_is_missing .git/refs/heads/missing &&
-	test_path_is_missing .git/NOTHEAD
+	test_must_fail git rev-parse refs/heads/missing &&
+	test_must_fail git symbolic-ref NOTHEAD
 '
 reset_to_sane
 
@@ -100,9 +106,8 @@ test_expect_success LONG_REF 'we can parse long symbolic ref' '
 '
 
 test_expect_success 'symbolic-ref reports failure in exit code' '
-	test_when_finished "rm -f .git/HEAD.lock" &&
-	>.git/HEAD.lock &&
-	test_must_fail git symbolic-ref HEAD refs/heads/whatever
+	# Create d/f conflict to simulate failure.
+	test_must_fail git symbolic-ref refs/heads refs/heads/foo
 '
 
 test_expect_success 'symbolic-ref writes reflog entry' '
@@ -160,4 +165,62 @@ test_expect_success 'symbolic-ref can resolve d/f name (ENOTDIR)' '
 	test_cmp expect actual
 '
 
+test_expect_success 'symbolic-ref refuses invalid target for non-HEAD' '
+	test_must_fail git symbolic-ref refs/heads/invalid foo..bar
+'
+
+test_expect_success 'symbolic-ref allows top-level target for non-HEAD' '
+	git symbolic-ref refs/heads/top-level ORIG_HEAD &&
+	git update-ref ORIG_HEAD HEAD &&
+	test_cmp_rev top-level HEAD
+'
+
+test_expect_success 'symbolic-ref pointing at another' '
+	git update-ref refs/heads/maint-2.37 HEAD &&
+	git symbolic-ref refs/heads/maint refs/heads/maint-2.37 &&
+	git checkout maint &&
+
+	git symbolic-ref HEAD >actual &&
+	echo refs/heads/maint-2.37 >expect &&
+	test_cmp expect actual &&
+
+	git symbolic-ref --no-recurse HEAD >actual &&
+	echo refs/heads/maint >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'symbolic-ref --short handles complex utf8 case' '
+	name="测试-加-增加-加-增加" &&
+	git symbolic-ref TEST_SYMREF "refs/heads/$name" &&
+	# In the real world, we saw problems with this case only
+	# when the locale includes UTF-8. Set it here to try to make things as
+	# hard as possible for us to pass, but in practice we should do the
+	# right thing regardless (and of course some platforms may not even
+	# have this locale).
+	LC_ALL=en_US.UTF-8 git symbolic-ref --short TEST_SYMREF >actual &&
+	echo "$name" >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'symbolic-ref --short handles name with suffix' '
+	git symbolic-ref TEST_SYMREF "refs/remotes/origin/HEAD" &&
+	git symbolic-ref --short TEST_SYMREF >actual &&
+	echo "origin" >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'symbolic-ref --short handles almost-matching name' '
+	git symbolic-ref TEST_SYMREF "refs/headsXfoo" &&
+	git symbolic-ref --short TEST_SYMREF >actual &&
+	echo "headsXfoo" >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'symbolic-ref --short handles name with percent' '
+	git symbolic-ref TEST_SYMREF "refs/heads/%foo" &&
+	git symbolic-ref --short TEST_SYMREF >actual &&
+	echo "%foo" >expect &&
+	test_cmp expect actual
+'
+
 test_done
diff --git a/t/t1402-check-ref-format.sh b/t/t1402-check-ref-format.sh
index 98e4a86..5ed9d73 100755
--- a/t/t1402-check-ref-format.sh
+++ b/t/t1402-check-ref-format.sh
@@ -2,6 +2,7 @@
 
 test_description='Test git check-ref-format'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 valid_ref() {
@@ -134,18 +135,18 @@ valid_ref !MINGW "$ref" '--refspec-pattern --allow-onelevel --normalize'
 test_expect_success "check-ref-format --branch @{-1}" '
 	T=$(git write-tree) &&
 	sha1=$(echo A | git commit-tree $T) &&
-	git update-ref refs/heads/master $sha1 &&
-	git update-ref refs/remotes/origin/master $sha1 &&
-	git checkout master &&
-	git checkout origin/master &&
-	git checkout master &&
+	git update-ref refs/heads/main $sha1 &&
+	git update-ref refs/remotes/origin/main $sha1 &&
+	git checkout main &&
+	git checkout origin/main &&
+	git checkout main &&
 	refname=$(git check-ref-format --branch @{-1}) &&
 	test "$refname" = "$sha1" &&
 	refname2=$(git check-ref-format --branch @{-2}) &&
-	test "$refname2" = master'
+	test "$refname2" = main'
 
-test_expect_success 'check-ref-format --branch -naster' '
-	test_must_fail git check-ref-format --branch -naster >actual &&
+test_expect_success 'check-ref-format --branch -nain' '
+	test_must_fail git check-ref-format --branch -nain >actual &&
 	test_must_be_empty actual
 '
 
@@ -154,11 +155,11 @@ test_expect_success 'check-ref-format --branch from subdir' '
 
 	T=$(git write-tree) &&
 	sha1=$(echo A | git commit-tree $T) &&
-	git update-ref refs/heads/master $sha1 &&
-	git update-ref refs/remotes/origin/master $sha1 &&
-	git checkout master &&
-	git checkout origin/master &&
-	git checkout master &&
+	git update-ref refs/heads/main $sha1 &&
+	git update-ref refs/remotes/origin/main $sha1 &&
+	git checkout main &&
+	git checkout origin/main &&
+	git checkout main &&
 	refname=$(
 		cd subdir &&
 		git check-ref-format --branch @{-1}
@@ -171,9 +172,9 @@ test_expect_success 'check-ref-format --branch @{-1} from non-repo' '
 	test_must_be_empty actual
 '
 
-test_expect_success 'check-ref-format --branch master from non-repo' '
-	echo master >expect &&
-	nongit git check-ref-format --branch master >actual &&
+test_expect_success 'check-ref-format --branch main from non-repo' '
+	echo main >expect &&
+	nongit git check-ref-format --branch main >actual &&
 	test_cmp expect actual
 '
 
diff --git a/t/t1403-show-ref.sh b/t/t1403-show-ref.sh
index 5d955c3..33fb7a3 100755
--- a/t/t1403-show-ref.sh
+++ b/t/t1403-show-ref.sh
@@ -1,15 +1,17 @@
 #!/bin/sh
 
 test_description='show-ref'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
-	test_commit A &&
-	git tag -f -a -m "annotated A" A &&
+	test_commit --annotate A &&
 	git checkout -b side &&
-	test_commit B &&
-	git tag -f -a -m "annotated B" B &&
-	git checkout master &&
+	test_commit --annotate B &&
+	git checkout main &&
 	test_commit C &&
 	git branch B A^0
 '
@@ -77,7 +79,7 @@ test_expect_success 'show-ref --verify -q' '
 test_expect_success 'show-ref -d' '
 	{
 		echo $(git rev-parse refs/tags/A) refs/tags/A &&
-		echo $(git rev-parse refs/tags/A^0) "refs/tags/A^{}"
+		echo $(git rev-parse refs/tags/A^0) "refs/tags/A^{}" &&
 		echo $(git rev-parse refs/tags/C) refs/tags/C
 	} >expect &&
 	git show-ref -d A C >actual &&
@@ -92,23 +94,23 @@ test_expect_success 'show-ref -d' '
 	git show-ref --verify -d refs/tags/A refs/tags/C >actual &&
 	test_cmp expect actual &&
 
-	echo $(git rev-parse refs/heads/master) refs/heads/master >expect &&
-	git show-ref -d master >actual &&
+	echo $(git rev-parse refs/heads/main) refs/heads/main >expect &&
+	git show-ref -d main >actual &&
 	test_cmp expect actual &&
 
-	git show-ref -d heads/master >actual &&
+	git show-ref -d heads/main >actual &&
 	test_cmp expect actual &&
 
-	git show-ref -d refs/heads/master >actual &&
+	git show-ref -d refs/heads/main >actual &&
 	test_cmp expect actual &&
 
-	git show-ref -d --verify refs/heads/master >actual &&
+	git show-ref -d --verify refs/heads/main >actual &&
 	test_cmp expect actual &&
 
-	test_must_fail git show-ref -d --verify master >actual &&
+	test_must_fail git show-ref -d --verify main >actual &&
 	test_must_be_empty actual &&
 
-	test_must_fail git show-ref -d --verify heads/master >actual &&
+	test_must_fail git show-ref -d --verify heads/main >actual &&
 	test_must_be_empty actual &&
 
 	test_must_fail git show-ref --verify -d A C >actual &&
@@ -120,16 +122,16 @@ test_expect_success 'show-ref -d' '
 '
 
 test_expect_success 'show-ref --heads, --tags, --head, pattern' '
-	for branch in B master side
+	for branch in B main side
 	do
-		echo $(git rev-parse refs/heads/$branch) refs/heads/$branch
+		echo $(git rev-parse refs/heads/$branch) refs/heads/$branch || return 1
 	done >expect.heads &&
 	git show-ref --heads >actual &&
 	test_cmp expect.heads actual &&
 
 	for tag in A B C
 	do
-		echo $(git rev-parse refs/tags/$tag) refs/tags/$tag
+		echo $(git rev-parse refs/tags/$tag) refs/tags/$tag || return 1
 	done >expect.tags &&
 	git show-ref --tags >actual &&
 	test_cmp expect.tags actual &&
@@ -147,7 +149,7 @@ test_expect_success 'show-ref --heads, --tags, --head, pattern' '
 
 	{
 		echo $(git rev-parse HEAD) HEAD &&
-		echo $(git rev-parse refs/heads/B) refs/heads/B
+		echo $(git rev-parse refs/heads/B) refs/heads/B &&
 		echo $(git rev-parse refs/tags/B) refs/tags/B
 	} >expect &&
 	git show-ref --head B >actual &&
@@ -155,8 +157,8 @@ test_expect_success 'show-ref --heads, --tags, --head, pattern' '
 
 	{
 		echo $(git rev-parse HEAD) HEAD &&
-		echo $(git rev-parse refs/heads/B) refs/heads/B
-		echo $(git rev-parse refs/tags/B) refs/tags/B
+		echo $(git rev-parse refs/heads/B) refs/heads/B &&
+		echo $(git rev-parse refs/tags/B) refs/tags/B &&
 		echo $(git rev-parse refs/tags/B^0) "refs/tags/B^{}"
 	} >expect &&
 	git show-ref --head -d B >actual &&
@@ -172,6 +174,14 @@ test_expect_success 'show-ref --verify HEAD' '
 	test_must_be_empty actual
 '
 
+test_expect_success 'show-ref --verify pseudorefs' '
+	git update-ref CHERRY_PICK_HEAD HEAD $ZERO_OID &&
+	test_when_finished "git update-ref -d CHERRY_PICK_HEAD" &&
+	git show-ref -s --verify HEAD >actual &&
+	git show-ref -s --verify CHERRY_PICK_HEAD >expect &&
+	test_cmp actual expect
+'
+
 test_expect_success 'show-ref --verify with dangling ref' '
 	sha1_file() {
 		echo "$*" | sed "s#..#.git/objects/&/#"
@@ -194,4 +204,86 @@ test_expect_success 'show-ref --verify with dangling ref' '
 	)
 '
 
+test_expect_success 'show-ref sub-modes are mutually exclusive' '
+	test_must_fail git show-ref --verify --exclude-existing 2>err &&
+	grep "verify" err &&
+	grep "exclude-existing" err &&
+	grep "cannot be used together" err &&
+
+	test_must_fail git show-ref --verify --exists 2>err &&
+	grep "verify" err &&
+	grep "exists" err &&
+	grep "cannot be used together" err &&
+
+	test_must_fail git show-ref --exclude-existing --exists 2>err &&
+	grep "exclude-existing" err &&
+	grep "exists" err &&
+	grep "cannot be used together" err
+'
+
+test_expect_success '--exists with existing reference' '
+	git show-ref --exists refs/heads/$GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+'
+
+test_expect_success '--exists with missing reference' '
+	test_expect_code 2 git show-ref --exists refs/heads/does-not-exist
+'
+
+test_expect_success '--exists does not use DWIM' '
+	test_expect_code 2 git show-ref --exists $GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME 2>err &&
+	grep "reference does not exist" err
+'
+
+test_expect_success '--exists with HEAD' '
+	git show-ref --exists HEAD
+'
+
+test_expect_success '--exists with bad reference name' '
+	test_when_finished "git update-ref -d refs/heads/bad...name" &&
+	new_oid=$(git rev-parse HEAD) &&
+	test-tool ref-store main update-ref msg refs/heads/bad...name $new_oid $ZERO_OID REF_SKIP_REFNAME_VERIFICATION &&
+	git show-ref --exists refs/heads/bad...name
+'
+
+test_expect_success '--exists with arbitrary symref' '
+	test_when_finished "git symbolic-ref -d refs/symref" &&
+	git symbolic-ref refs/symref refs/heads/$GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME &&
+	git show-ref --exists refs/symref
+'
+
+test_expect_success '--exists with dangling symref' '
+	test_when_finished "git symbolic-ref -d refs/heads/dangling" &&
+	git symbolic-ref refs/heads/dangling refs/heads/does-not-exist &&
+	git show-ref --exists refs/heads/dangling
+'
+
+test_expect_success '--exists with nonexistent object ID' '
+	test-tool ref-store main update-ref msg refs/heads/missing-oid $(test_oid 001) $ZERO_OID REF_SKIP_OID_VERIFICATION &&
+	git show-ref --exists refs/heads/missing-oid
+'
+
+test_expect_success '--exists with non-commit object' '
+	tree_oid=$(git rev-parse HEAD^{tree}) &&
+	test-tool ref-store main update-ref msg refs/heads/tree ${tree_oid} $ZERO_OID REF_SKIP_OID_VERIFICATION &&
+	git show-ref --exists refs/heads/tree
+'
+
+test_expect_success '--exists with directory fails with generic error' '
+	cat >expect <<-EOF &&
+	error: reference does not exist
+	EOF
+	test_expect_code 2 git show-ref --exists refs/heads 2>err &&
+	test_cmp expect err
+'
+
+test_expect_success '--exists with non-existent special ref' '
+	test_expect_code 2 git show-ref --exists FETCH_HEAD
+'
+
+test_expect_success '--exists with existing special ref' '
+	test_when_finished "rm .git/FETCH_HEAD" &&
+	git rev-parse HEAD >.git/FETCH_HEAD &&
+	git show-ref --exists FETCH_HEAD
+'
+
 test_done
diff --git a/t/t1404-update-ref-errors.sh b/t/t1404-update-ref-errors.sh
index 2d142e5..98e9158 100755
--- a/t/t1404-update-ref-errors.sh
+++ b/t/t1404-update-ref-errors.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='Test git update-ref error handling'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # Create some references, perhaps run pack-refs --all, then try to
@@ -27,7 +29,7 @@ test_update_rejected () {
 	fi &&
 	printf "create $prefix/%s $C\n" $create >input &&
 	test_must_fail git update-ref --stdin <input 2>output.err &&
-	test_i18ngrep -F "$error" output.err &&
+	test_grep -F "$error" output.err &&
 	git for-each-ref $prefix >actual &&
 	test_cmp unchanged actual
 }
@@ -90,9 +92,6 @@ df_test() {
 	else
 		delname="$delref"
 	fi &&
-	cat >expected-err <<-EOF &&
-	fatal: cannot lock ref $SQ$addname$SQ: $SQ$delref$SQ exists; cannot create $SQ$addref$SQ
-	EOF
 	$pack &&
 	if $add_del
 	then
@@ -101,7 +100,7 @@ df_test() {
 		printf "%s\n" "delete $delname" "create $addname $D"
 	fi >commands &&
 	test_must_fail git update-ref --stdin <commands 2>output.err &&
-	test_i18ncmp expected-err output.err &&
+	grep "fatal:\( cannot lock ref $SQ$addname$SQ:\)\? $SQ$delref$SQ exists; cannot create $SQ$addref$SQ" output.err &&
 	printf "%s\n" "$C $delref" >expected-refs &&
 	git for-each-ref --format="%(objectname) %(refname)" $prefix/r >actual-refs &&
 	test_cmp expected-refs actual-refs
@@ -189,78 +188,6 @@ test_expect_success 'one new ref is a simple prefix of another' '
 
 '
 
-test_expect_success 'empty directory should not fool rev-parse' '
-	prefix=refs/e-rev-parse &&
-	git update-ref $prefix/foo $C &&
-	git pack-refs --all &&
-	mkdir -p .git/$prefix/foo/bar/baz &&
-	echo "$C" >expected &&
-	git rev-parse $prefix/foo >actual &&
-	test_cmp expected actual
-'
-
-test_expect_success 'empty directory should not fool for-each-ref' '
-	prefix=refs/e-for-each-ref &&
-	git update-ref $prefix/foo $C &&
-	git for-each-ref $prefix >expected &&
-	git pack-refs --all &&
-	mkdir -p .git/$prefix/foo/bar/baz &&
-	git for-each-ref $prefix >actual &&
-	test_cmp expected actual
-'
-
-test_expect_success 'empty directory should not fool create' '
-	prefix=refs/e-create &&
-	mkdir -p .git/$prefix/foo/bar/baz &&
-	printf "create %s $C\n" $prefix/foo |
-	git update-ref --stdin
-'
-
-test_expect_success 'empty directory should not fool verify' '
-	prefix=refs/e-verify &&
-	git update-ref $prefix/foo $C &&
-	git pack-refs --all &&
-	mkdir -p .git/$prefix/foo/bar/baz &&
-	printf "verify %s $C\n" $prefix/foo |
-	git update-ref --stdin
-'
-
-test_expect_success 'empty directory should not fool 1-arg update' '
-	prefix=refs/e-update-1 &&
-	git update-ref $prefix/foo $C &&
-	git pack-refs --all &&
-	mkdir -p .git/$prefix/foo/bar/baz &&
-	printf "update %s $D\n" $prefix/foo |
-	git update-ref --stdin
-'
-
-test_expect_success 'empty directory should not fool 2-arg update' '
-	prefix=refs/e-update-2 &&
-	git update-ref $prefix/foo $C &&
-	git pack-refs --all &&
-	mkdir -p .git/$prefix/foo/bar/baz &&
-	printf "update %s $D $C\n" $prefix/foo |
-	git update-ref --stdin
-'
-
-test_expect_success 'empty directory should not fool 0-arg delete' '
-	prefix=refs/e-delete-0 &&
-	git update-ref $prefix/foo $C &&
-	git pack-refs --all &&
-	mkdir -p .git/$prefix/foo/bar/baz &&
-	printf "delete %s\n" $prefix/foo |
-	git update-ref --stdin
-'
-
-test_expect_success 'empty directory should not fool 1-arg delete' '
-	prefix=refs/e-delete-1 &&
-	git update-ref $prefix/foo $C &&
-	git pack-refs --all &&
-	mkdir -p .git/$prefix/foo/bar/baz &&
-	printf "delete %s $C\n" $prefix/foo |
-	git update-ref --stdin
-'
-
 test_expect_success 'D/F conflict prevents add long + delete short' '
 	df_test refs/df-al-ds --add-del foo/bar foo
 '
@@ -466,170 +393,4 @@ test_expect_success 'incorrect old value blocks indirect no-deref delete' '
 	test_cmp expected output.err
 '
 
-test_expect_success 'non-empty directory blocks create' '
-	prefix=refs/ne-create &&
-	mkdir -p .git/$prefix/foo/bar &&
-	: >.git/$prefix/foo/bar/baz.lock &&
-	test_when_finished "rm -f .git/$prefix/foo/bar/baz.lock" &&
-	cat >expected <<-EOF &&
-	fatal: cannot lock ref $SQ$prefix/foo$SQ: there is a non-empty directory $SQ.git/$prefix/foo$SQ blocking reference $SQ$prefix/foo$SQ
-	EOF
-	printf "%s\n" "update $prefix/foo $C" |
-	test_must_fail git update-ref --stdin 2>output.err &&
-	test_cmp expected output.err &&
-	cat >expected <<-EOF &&
-	fatal: cannot lock ref $SQ$prefix/foo$SQ: unable to resolve reference $SQ$prefix/foo$SQ
-	EOF
-	printf "%s\n" "update $prefix/foo $D $C" |
-	test_must_fail git update-ref --stdin 2>output.err &&
-	test_cmp expected output.err
-'
-
-test_expect_success 'broken reference blocks create' '
-	prefix=refs/broken-create &&
-	mkdir -p .git/$prefix &&
-	echo "gobbledigook" >.git/$prefix/foo &&
-	test_when_finished "rm -f .git/$prefix/foo" &&
-	cat >expected <<-EOF &&
-	fatal: cannot lock ref $SQ$prefix/foo$SQ: unable to resolve reference $SQ$prefix/foo$SQ: reference broken
-	EOF
-	printf "%s\n" "update $prefix/foo $C" |
-	test_must_fail git update-ref --stdin 2>output.err &&
-	test_cmp expected output.err &&
-	cat >expected <<-EOF &&
-	fatal: cannot lock ref $SQ$prefix/foo$SQ: unable to resolve reference $SQ$prefix/foo$SQ: reference broken
-	EOF
-	printf "%s\n" "update $prefix/foo $D $C" |
-	test_must_fail git update-ref --stdin 2>output.err &&
-	test_cmp expected output.err
-'
-
-test_expect_success 'non-empty directory blocks indirect create' '
-	prefix=refs/ne-indirect-create &&
-	git symbolic-ref $prefix/symref $prefix/foo &&
-	mkdir -p .git/$prefix/foo/bar &&
-	: >.git/$prefix/foo/bar/baz.lock &&
-	test_when_finished "rm -f .git/$prefix/foo/bar/baz.lock" &&
-	cat >expected <<-EOF &&
-	fatal: cannot lock ref $SQ$prefix/symref$SQ: there is a non-empty directory $SQ.git/$prefix/foo$SQ blocking reference $SQ$prefix/foo$SQ
-	EOF
-	printf "%s\n" "update $prefix/symref $C" |
-	test_must_fail git update-ref --stdin 2>output.err &&
-	test_cmp expected output.err &&
-	cat >expected <<-EOF &&
-	fatal: cannot lock ref $SQ$prefix/symref$SQ: unable to resolve reference $SQ$prefix/foo$SQ
-	EOF
-	printf "%s\n" "update $prefix/symref $D $C" |
-	test_must_fail git update-ref --stdin 2>output.err &&
-	test_cmp expected output.err
-'
-
-test_expect_success 'broken reference blocks indirect create' '
-	prefix=refs/broken-indirect-create &&
-	git symbolic-ref $prefix/symref $prefix/foo &&
-	echo "gobbledigook" >.git/$prefix/foo &&
-	test_when_finished "rm -f .git/$prefix/foo" &&
-	cat >expected <<-EOF &&
-	fatal: cannot lock ref $SQ$prefix/symref$SQ: unable to resolve reference $SQ$prefix/foo$SQ: reference broken
-	EOF
-	printf "%s\n" "update $prefix/symref $C" |
-	test_must_fail git update-ref --stdin 2>output.err &&
-	test_cmp expected output.err &&
-	cat >expected <<-EOF &&
-	fatal: cannot lock ref $SQ$prefix/symref$SQ: unable to resolve reference $SQ$prefix/foo$SQ: reference broken
-	EOF
-	printf "%s\n" "update $prefix/symref $D $C" |
-	test_must_fail git update-ref --stdin 2>output.err &&
-	test_cmp expected output.err
-'
-
-test_expect_success 'no bogus intermediate values during delete' '
-	prefix=refs/slow-transaction &&
-	# Set up a reference with differing loose and packed versions:
-	git update-ref $prefix/foo $C &&
-	git pack-refs --all &&
-	git update-ref $prefix/foo $D &&
-	git for-each-ref $prefix >unchanged &&
-	# Now try to update the reference, but hold the `packed-refs` lock
-	# for a while to see what happens while the process is blocked:
-	: >.git/packed-refs.lock &&
-	test_when_finished "rm -f .git/packed-refs.lock" &&
-	{
-		# Note: the following command is intentionally run in the
-		# background. We increase the timeout so that `update-ref`
-		# attempts to acquire the `packed-refs` lock for much longer
-		# than it takes for us to do the check then delete it:
-		git -c core.packedrefstimeout=30000 update-ref -d $prefix/foo &
-	} &&
-	pid2=$! &&
-	# Give update-ref plenty of time to get to the point where it tries
-	# to lock packed-refs:
-	sleep 1 &&
-	# Make sure that update-ref did not complete despite the lock:
-	kill -0 $pid2 &&
-	# Verify that the reference still has its old value:
-	sha1=$(git rev-parse --verify --quiet $prefix/foo || echo undefined) &&
-	case "$sha1" in
-	$D)
-		# This is what we hope for; it means that nothing
-		# user-visible has changed yet.
-		: ;;
-	undefined)
-		# This is not correct; it means the deletion has happened
-		# already even though update-ref should not have been
-		# able to acquire the lock yet.
-		echo "$prefix/foo deleted prematurely" &&
-		break
-		;;
-	$C)
-		# This value should never be seen. Probably the loose
-		# reference has been deleted but the packed reference
-		# is still there:
-		echo "$prefix/foo incorrectly observed to be C" &&
-		break
-		;;
-	*)
-		# WTF?
-		echo "unexpected value observed for $prefix/foo: $sha1" &&
-		break
-		;;
-	esac >out &&
-	rm -f .git/packed-refs.lock &&
-	wait $pid2 &&
-	test_must_be_empty out &&
-	test_must_fail git rev-parse --verify --quiet $prefix/foo
-'
-
-test_expect_success 'delete fails cleanly if packed-refs file is locked' '
-	prefix=refs/locked-packed-refs &&
-	# Set up a reference with differing loose and packed versions:
-	git update-ref $prefix/foo $C &&
-	git pack-refs --all &&
-	git update-ref $prefix/foo $D &&
-	git for-each-ref $prefix >unchanged &&
-	# Now try to delete it while the `packed-refs` lock is held:
-	: >.git/packed-refs.lock &&
-	test_when_finished "rm -f .git/packed-refs.lock" &&
-	test_must_fail git update-ref -d $prefix/foo >out 2>err &&
-	git for-each-ref $prefix >actual &&
-	test_i18ngrep "Unable to create $SQ.*packed-refs.lock$SQ: " err &&
-	test_cmp unchanged actual
-'
-
-test_expect_success 'delete fails cleanly if packed-refs.new write fails' '
-	# Setup and expectations are similar to the test above.
-	prefix=refs/failed-packed-refs &&
-	git update-ref $prefix/foo $C &&
-	git pack-refs --all &&
-	git update-ref $prefix/foo $D &&
-	git for-each-ref $prefix >unchanged &&
-	# This should not happen in practice, but it is an easy way to get a
-	# reliable error (we open with create_tempfile(), which uses O_EXCL).
-	: >.git/packed-refs.new &&
-	test_when_finished "rm -f .git/packed-refs.new" &&
-	test_must_fail git update-ref -d $prefix/foo &&
-	git for-each-ref $prefix >actual &&
-	test_cmp unchanged actual
-'
-
 test_done
diff --git a/t/t1405-main-ref-store.sh b/t/t1405-main-ref-store.sh
index 331899d..a6bcd62 100755
--- a/t/t1405-main-ref-store.sh
+++ b/t/t1405-main-ref-store.sh
@@ -2,53 +2,50 @@
 
 test_description='test main ref store api'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 RUN="test-tool ref-store main"
 
-test_expect_success 'pack_refs(PACK_REFS_ALL | PACK_REFS_PRUNE)' '
-	test_commit one &&
-	N=`find .git/refs -type f | wc -l` &&
-	test "$N" != 0 &&
-	$RUN pack-refs 3 &&
-	N=`find .git/refs -type f | wc -l`
-'
 
-test_expect_success 'peel_ref(new-tag)' '
-	git rev-parse HEAD >expected &&
-	git tag -a -m new-tag new-tag HEAD &&
-	$RUN peel-ref refs/tags/new-tag >actual &&
-	test_cmp expected actual
+test_expect_success 'setup' '
+	test_commit one
 '
 
-test_expect_success 'create_symref(FOO, refs/heads/master)' '
-	$RUN create-symref FOO refs/heads/master nothing &&
-	echo refs/heads/master >expected &&
+test_expect_success 'create_symref(FOO, refs/heads/main)' '
+	$RUN create-symref FOO refs/heads/main nothing &&
+	echo refs/heads/main >expected &&
 	git symbolic-ref FOO >actual &&
 	test_cmp expected actual
 '
 
 test_expect_success 'delete_refs(FOO, refs/tags/new-tag)' '
+	git tag -a -m new-tag new-tag HEAD &&
 	git rev-parse FOO -- &&
 	git rev-parse refs/tags/new-tag -- &&
-	$RUN delete-refs 0 nothing FOO refs/tags/new-tag &&
+	m=$(git rev-parse main) &&
+	$RUN delete-refs REF_NO_DEREF nothing FOO refs/tags/new-tag &&
+	test_must_fail git rev-parse --symbolic-full-name FOO &&
 	test_must_fail git rev-parse FOO -- &&
 	test_must_fail git rev-parse refs/tags/new-tag --
 '
 
-test_expect_success 'rename_refs(master, new-master)' '
-	git rev-parse master >expected &&
-	$RUN rename-ref refs/heads/master refs/heads/new-master &&
-	git rev-parse new-master >actual &&
+test_expect_success 'rename_refs(main, new-main)' '
+	git rev-parse main >expected &&
+	$RUN rename-ref refs/heads/main refs/heads/new-main &&
+	git rev-parse new-main >actual &&
 	test_cmp expected actual &&
-	test_commit recreate-master
+	test_commit recreate-main
 '
 
 test_expect_success 'for_each_ref(refs/heads/)' '
 	$RUN for-each-ref refs/heads/ | cut -d" " -f 2- >actual &&
 	cat >expected <<-\EOF &&
-	master 0x0
-	new-master 0x0
+	main 0x0
+	new-main 0x0
 	EOF
 	test_cmp expected actual
 '
@@ -59,23 +56,23 @@ test_expect_success 'for_each_ref() is sorted' '
 	test_cmp expected actual
 '
 
-test_expect_success 'resolve_ref(new-master)' '
-	SHA1=`git rev-parse new-master` &&
-	echo "$SHA1 refs/heads/new-master 0x0" >expected &&
-	$RUN resolve-ref refs/heads/new-master 0 >actual &&
+test_expect_success 'resolve_ref(new-main)' '
+	SHA1=`git rev-parse new-main` &&
+	echo "$SHA1 refs/heads/new-main 0x0" >expected &&
+	$RUN resolve-ref refs/heads/new-main 0 >actual &&
 	test_cmp expected actual
 '
 
-test_expect_success 'verify_ref(new-master)' '
-	$RUN verify-ref refs/heads/new-master
+test_expect_success 'verify_ref(new-main)' '
+	$RUN verify-ref refs/heads/new-main
 '
 
 test_expect_success 'for_each_reflog()' '
-	$RUN for-each-reflog | sort -k2 | cut -d" " -f 2- >actual &&
+	$RUN for-each-reflog >actual &&
 	cat >expected <<-\EOF &&
-	HEAD 0x1
-	refs/heads/master 0x0
-	refs/heads/new-master 0x0
+	HEAD
+	refs/heads/main
+	refs/heads/new-main
 	EOF
 	test_cmp expected actual
 '
@@ -83,13 +80,13 @@ test_expect_success 'for_each_reflog()' '
 test_expect_success 'for_each_reflog_ent()' '
 	$RUN for-each-reflog-ent HEAD >actual &&
 	head -n1 actual | grep one &&
-	tail -n2 actual | head -n1 | grep recreate-master
+	tail -n1 actual | grep recreate-main
 '
 
 test_expect_success 'for_each_reflog_ent_reverse()' '
 	$RUN for-each-reflog-ent-reverse HEAD >actual &&
-	head -n1 actual | grep recreate-master &&
-	tail -n2 actual | head -n1 | grep one
+	head -n1 actual | grep recreate-main &&
+	tail -n1 actual | grep one
 '
 
 test_expect_success 'reflog_exists(HEAD)' '
@@ -98,12 +95,12 @@ test_expect_success 'reflog_exists(HEAD)' '
 
 test_expect_success 'delete_reflog(HEAD)' '
 	$RUN delete-reflog HEAD &&
-	! test -f .git/logs/HEAD
+	test_must_fail git reflog exists HEAD
 '
 
 test_expect_success 'create-reflog(HEAD)' '
-	$RUN create-reflog HEAD 1 &&
-	test -f .git/logs/HEAD
+	$RUN create-reflog HEAD &&
+	git reflog exists HEAD
 '
 
 test_expect_success 'delete_ref(refs/heads/foo)' '
diff --git a/t/t1406-submodule-ref-store.sh b/t/t1406-submodule-ref-store.sh
index 36b7ef5..c01f0f1 100755
--- a/t/t1406-submodule-ref-store.sh
+++ b/t/t1406-submodule-ref-store.sh
@@ -2,6 +2,10 @@
 
 test_description='test submodule ref store api'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 RUN="test-tool ref-store submodule:sub"
@@ -11,7 +15,8 @@ test_expect_success 'setup' '
 	(
 		cd sub &&
 		test_commit first &&
-		git checkout -b new-master
+		git checkout -b new-main &&
+		git tag -a -m new-tag new-tag HEAD
 	)
 '
 
@@ -19,15 +24,8 @@ test_expect_success 'pack_refs() not allowed' '
 	test_must_fail $RUN pack-refs 3
 '
 
-test_expect_success 'peel_ref(new-tag)' '
-	git -C sub rev-parse HEAD >expected &&
-	git -C sub tag -a -m new-tag new-tag HEAD &&
-	$RUN peel-ref refs/tags/new-tag >actual &&
-	test_cmp expected actual
-'
-
 test_expect_success 'create_symref() not allowed' '
-	test_must_fail $RUN create-symref FOO refs/heads/master nothing
+	test_must_fail $RUN create-symref FOO refs/heads/main nothing
 '
 
 test_expect_success 'delete_refs() not allowed' '
@@ -35,14 +33,14 @@ test_expect_success 'delete_refs() not allowed' '
 '
 
 test_expect_success 'rename_refs() not allowed' '
-	test_must_fail $RUN rename-ref refs/heads/master refs/heads/new-master
+	test_must_fail $RUN rename-ref refs/heads/main refs/heads/new-main
 '
 
 test_expect_success 'for_each_ref(refs/heads/)' '
 	$RUN for-each-ref refs/heads/ | cut -d" " -f 2- >actual &&
 	cat >expected <<-\EOF &&
-	master 0x0
-	new-master 0x0
+	main 0x0
+	new-main 0x0
 	EOF
 	test_cmp expected actual
 '
@@ -53,23 +51,23 @@ test_expect_success 'for_each_ref() is sorted' '
 	test_cmp expected actual
 '
 
-test_expect_success 'resolve_ref(master)' '
-	SHA1=`git -C sub rev-parse master` &&
-	echo "$SHA1 refs/heads/master 0x0" >expected &&
-	$RUN resolve-ref refs/heads/master 0 >actual &&
+test_expect_success 'resolve_ref(main)' '
+	SHA1=`git -C sub rev-parse main` &&
+	echo "$SHA1 refs/heads/main 0x0" >expected &&
+	$RUN resolve-ref refs/heads/main 0 >actual &&
 	test_cmp expected actual
 '
 
-test_expect_success 'verify_ref(new-master)' '
-	$RUN verify-ref refs/heads/new-master
+test_expect_success 'verify_ref(new-main)' '
+	$RUN verify-ref refs/heads/new-main
 '
 
 test_expect_success 'for_each_reflog()' '
-	$RUN for-each-reflog | sort | cut -d" " -f 2- >actual &&
+	$RUN for-each-reflog >actual &&
 	cat >expected <<-\EOF &&
-	HEAD 0x1
-	refs/heads/master 0x0
-	refs/heads/new-master 0x0
+	HEAD
+	refs/heads/main
+	refs/heads/new-main
 	EOF
 	test_cmp expected actual
 '
@@ -77,13 +75,13 @@ test_expect_success 'for_each_reflog()' '
 test_expect_success 'for_each_reflog_ent()' '
 	$RUN for-each-reflog-ent HEAD >actual &&
 	head -n1 actual | grep first &&
-	tail -n2 actual | head -n1 | grep master.to.new
+	tail -n1 actual | grep main.to.new
 '
 
 test_expect_success 'for_each_reflog_ent_reverse()' '
 	$RUN for-each-reflog-ent-reverse HEAD >actual &&
-	head -n1 actual | grep master.to.new &&
-	tail -n2 actual | head -n1 | grep first
+	head -n1 actual | grep main.to.new &&
+	tail -n1 actual | grep first
 '
 
 test_expect_success 'reflog_exists(HEAD)' '
@@ -95,7 +93,7 @@ test_expect_success 'delete_reflog() not allowed' '
 '
 
 test_expect_success 'create-reflog() not allowed' '
-	test_must_fail $RUN create-reflog HEAD 1
+	test_must_fail $RUN create-reflog HEAD
 '
 
 test_done
diff --git a/t/t1407-worktree-ref-store.sh b/t/t1407-worktree-ref-store.sh
index 9a84858..48b1c92 100755
--- a/t/t1407-worktree-ref-store.sh
+++ b/t/t1407-worktree-ref-store.sh
@@ -2,6 +2,10 @@
 
 test_description='test worktree ref store api'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 RWT="test-tool ref-store worktree:wt"
@@ -9,7 +13,7 @@ RMAIN="test-tool ref-store worktree:main"
 
 test_expect_success 'setup' '
 	test_commit first &&
-	git worktree add -b wt-master wt &&
+	git worktree add -b wt-main wt &&
 	(
 		cd wt &&
 		test_commit second
@@ -17,66 +21,36 @@ test_expect_success 'setup' '
 '
 
 test_expect_success 'resolve_ref(<shared-ref>)' '
-	SHA1=`git rev-parse master` &&
-	echo "$SHA1 refs/heads/master 0x0" >expected &&
-	$RWT resolve-ref refs/heads/master 0 >actual &&
+	SHA1=`git rev-parse main` &&
+	echo "$SHA1 refs/heads/main 0x0" >expected &&
+	$RWT resolve-ref refs/heads/main 0 >actual &&
 	test_cmp expected actual &&
-	$RMAIN resolve-ref refs/heads/master 0 >actual &&
+	$RMAIN resolve-ref refs/heads/main 0 >actual &&
 	test_cmp expected actual
 '
 
 test_expect_success 'resolve_ref(<per-worktree-ref>)' '
 	SHA1=`git -C wt rev-parse HEAD` &&
-	echo "$SHA1 refs/heads/wt-master 0x1" >expected &&
+	echo "$SHA1 refs/heads/wt-main 0x1" >expected &&
 	$RWT resolve-ref HEAD 0 >actual &&
 	test_cmp expected actual &&
 
 	SHA1=`git rev-parse HEAD` &&
-	echo "$SHA1 refs/heads/master 0x1" >expected &&
+	echo "$SHA1 refs/heads/main 0x1" >expected &&
 	$RMAIN resolve-ref HEAD 0 >actual &&
 	test_cmp expected actual
 '
 
-test_expect_success 'create_symref(FOO, refs/heads/master)' '
-	$RWT create-symref FOO refs/heads/master nothing &&
-	echo refs/heads/master >expected &&
+test_expect_success 'create_symref(FOO, refs/heads/main)' '
+	$RWT create-symref FOO refs/heads/main nothing &&
+	echo refs/heads/main >expected &&
 	git -C wt symbolic-ref FOO >actual &&
 	test_cmp expected actual &&
 
-	$RMAIN create-symref FOO refs/heads/wt-master nothing &&
-	echo refs/heads/wt-master >expected &&
+	$RMAIN create-symref FOO refs/heads/wt-main nothing &&
+	echo refs/heads/wt-main >expected &&
 	git symbolic-ref FOO >actual &&
 	test_cmp expected actual
 '
 
-test_expect_success 'for_each_reflog()' '
-	echo $ZERO_OID > .git/logs/PSEUDO-MAIN &&
-	mkdir -p     .git/logs/refs/bisect &&
-	echo $ZERO_OID > .git/logs/refs/bisect/random &&
-
-	echo $ZERO_OID > .git/worktrees/wt/logs/PSEUDO-WT &&
-	mkdir -p     .git/worktrees/wt/logs/refs/bisect &&
-	echo $ZERO_OID > .git/worktrees/wt/logs/refs/bisect/wt-random &&
-
-	$RWT for-each-reflog | cut -d" " -f 2- | sort >actual &&
-	cat >expected <<-\EOF &&
-	HEAD 0x1
-	PSEUDO-WT 0x0
-	refs/bisect/wt-random 0x0
-	refs/heads/master 0x0
-	refs/heads/wt-master 0x0
-	EOF
-	test_cmp expected actual &&
-
-	$RMAIN for-each-reflog | cut -d" " -f 2- | sort >actual &&
-	cat >expected <<-\EOF &&
-	HEAD 0x1
-	PSEUDO-MAIN 0x0
-	refs/bisect/random 0x0
-	refs/heads/master 0x0
-	refs/heads/wt-master 0x0
-	EOF
-	test_cmp expected actual
-'
-
 test_done
diff --git a/t/t1408-packed-refs.sh b/t/t1408-packed-refs.sh
index 1e44a17..9469c79 100755
--- a/t/t1408-packed-refs.sh
+++ b/t/t1408-packed-refs.sh
@@ -2,6 +2,10 @@
 
 test_description='packed-refs entries are covered by loose refs'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -9,32 +13,32 @@ test_expect_success setup '
 	git commit --allow-empty -m one &&
 	one=$(git rev-parse HEAD) &&
 	git for-each-ref >actual &&
-	echo "$one commit	refs/heads/master" >expect &&
+	echo "$one commit	refs/heads/main" >expect &&
 	test_cmp expect actual &&
 
 	git pack-refs --all &&
 	git for-each-ref >actual &&
-	echo "$one commit	refs/heads/master" >expect &&
+	echo "$one commit	refs/heads/main" >expect &&
 	test_cmp expect actual &&
 
 	git checkout --orphan another &&
 	test_tick &&
 	git commit --allow-empty -m two &&
 	two=$(git rev-parse HEAD) &&
-	git checkout -B master &&
+	git checkout -B main &&
 	git branch -D another &&
 
 	git for-each-ref >actual &&
-	echo "$two commit	refs/heads/master" >expect &&
+	echo "$two commit	refs/heads/main" >expect &&
 	test_cmp expect actual &&
 
 	git reflog expire --expire=now --all &&
 	git prune &&
-	git tag -m v1.0 v1.0 master
+	git tag -m v1.0 v1.0 main
 '
 
 test_expect_success 'no error from stale entry in packed-refs' '
-	git describe master >actual 2>&1 &&
+	git describe main >actual 2>&1 &&
 	echo "v1.0" >expect &&
 	test_cmp expect actual
 '
diff --git a/t/t1409-avoid-packing-refs.sh b/t/t1409-avoid-packing-refs.sh
index be12fb6..7748973 100755
--- a/t/t1409-avoid-packing-refs.sh
+++ b/t/t1409-avoid-packing-refs.sh
@@ -2,8 +2,15 @@
 
 test_description='avoid rewriting packed-refs unnecessarily'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
+if test_have_prereq !REFFILES
+then
+  skip_all='skipping files-backend specific pack-refs tests'
+  test_done
+fi
+
 # Add an identifying mark to the packed-refs file header line. This
 # shouldn't upset readers, and it should be omitted if the file is
 # ever rewritten.
diff --git a/t/t1410-reflog.sh b/t/t1410-reflog.sh
index 730a43d..5bf883f 100755
--- a/t/t1410-reflog.sh
+++ b/t/t1410-reflog.sh
@@ -4,6 +4,10 @@
 #
 
 test_description='Test prune and reflog expiration'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 check_have () {
@@ -25,7 +29,7 @@ check_fsck () {
 	'')
 		test_must_be_empty fsck.output ;;
 	*)
-		test_i18ngrep "$1" fsck.output ;;
+		test_grep "$1" fsck.output ;;
 	esac
 }
 
@@ -99,10 +103,32 @@ test_expect_success setup '
 
 	check_fsck &&
 
-	git reflog refs/heads/master >output &&
+	git reflog refs/heads/main >output &&
 	test_line_count = 4 output
 '
 
+test_expect_success 'correct usage on sub-command -h' '
+	test_expect_code 129 git reflog expire -h >err &&
+	grep "git reflog expire" err
+'
+
+test_expect_success 'correct usage on "git reflog show -h"' '
+	test_expect_code 129 git reflog show -h >err &&
+	grep -F "git reflog [show]" err
+'
+
+test_expect_success 'pass through -- to sub-command' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	test_commit -C repo message --a-file contents dash-tag &&
+
+	git -C repo reflog show -- --does-not-exist >out &&
+	test_must_be_empty out &&
+	git -C repo reflog show >expect &&
+	git -C repo reflog show -- --a-file >actual &&
+	test_cmp expect actual
+'
+
 test_expect_success rewind '
 	test_tick && git reset --hard HEAD~2 &&
 	test -f C &&
@@ -116,7 +142,7 @@ test_expect_success rewind '
 
 	check_have A B C D E F G H I J K L &&
 
-	git reflog refs/heads/master >output &&
+	git reflog refs/heads/main >output &&
 	test_line_count = 5 output
 '
 
@@ -135,7 +161,7 @@ test_expect_success 'reflog expire --dry-run should not touch reflog' '
 		--stale-fix \
 		--all &&
 
-	git reflog refs/heads/master >output &&
+	git reflog refs/heads/main >output &&
 	test_line_count = 5 output &&
 
 	check_fsck "missing blob $F"
@@ -149,12 +175,38 @@ test_expect_success 'reflog expire' '
 		--stale-fix \
 		--all &&
 
-	git reflog refs/heads/master >output &&
+	git reflog refs/heads/main >output &&
 	test_line_count = 2 output &&
 
 	check_fsck "dangling commit $K"
 '
 
+test_expect_success '--stale-fix handles missing objects generously' '
+	git -c core.logAllRefUpdates=false fast-import --date-format=now <<-EOS &&
+	commit refs/heads/stale-fix
+	mark :1
+	committer Author <a@uth.or> now
+	data <<EOF
+	start stale fix
+	EOF
+	M 100644 inline file
+	data <<EOF
+	contents
+	EOF
+	commit refs/heads/stale-fix
+	committer Author <a@uth.or> now
+	data <<EOF
+	stale fix branch tip
+	EOF
+	from :1
+	EOS
+
+	parent_oid=$(git rev-parse stale-fix^) &&
+	test_when_finished "recover $parent_oid" &&
+	corrupt $parent_oid &&
+	git reflog expire --stale-fix
+'
+
 test_expect_success 'prune and fsck' '
 
 	git prune &&
@@ -186,29 +238,29 @@ test_expect_success 'delete' '
 	git commit -m tiger C &&
 
 	HEAD_entry_count=$(git reflog | wc -l) &&
-	master_entry_count=$(git reflog show master | wc -l) &&
+	main_entry_count=$(git reflog show main | wc -l) &&
 
 	test $HEAD_entry_count = 5 &&
-	test $master_entry_count = 5 &&
+	test $main_entry_count = 5 &&
 
 
-	git reflog delete master@{1} &&
-	git reflog show master > output &&
-	test_line_count = $(($master_entry_count - 1)) output &&
+	git reflog delete main@{1} &&
+	git reflog show main > output &&
+	test_line_count = $(($main_entry_count - 1)) output &&
 	test $HEAD_entry_count = $(git reflog | wc -l) &&
 	! grep ox < output &&
 
-	master_entry_count=$(wc -l < output) &&
+	main_entry_count=$(wc -l < output) &&
 
 	git reflog delete HEAD@{1} &&
 	test $(($HEAD_entry_count -1)) = $(git reflog | wc -l) &&
-	test $master_entry_count = $(git reflog show master | wc -l) &&
+	test $main_entry_count = $(git reflog show main | wc -l) &&
 
 	HEAD_entry_count=$(git reflog | wc -l) &&
 
-	git reflog delete master@{07.04.2005.15:15:00.-0700} &&
-	git reflog show master > output &&
-	test_line_count = $(($master_entry_count - 1)) output &&
+	git reflog delete main@{07.04.2005.15:15:00.-0700} &&
+	git reflog show main > output &&
+	test_line_count = $(($main_entry_count - 1)) output &&
 	! grep dragon < output
 
 '
@@ -216,7 +268,7 @@ test_expect_success 'delete' '
 test_expect_success 'rewind2' '
 
 	test_tick && git reset --hard HEAD~2 &&
-	git reflog refs/heads/master >output &&
+	git reflog refs/heads/main >output &&
 	test_line_count = 4 output
 '
 
@@ -226,7 +278,7 @@ test_expect_success '--expire=never' '
 		--expire=never \
 		--expire-unreachable=never \
 		--all &&
-	git reflog refs/heads/master >output &&
+	git reflog refs/heads/main >output &&
 	test_line_count = 4 output
 '
 
@@ -237,7 +289,7 @@ test_expect_success 'gc.reflogexpire=never' '
 	git reflog expire --verbose --all >output &&
 	test_line_count = 9 output &&
 
-	git reflog refs/heads/master >output &&
+	git reflog refs/heads/main >output &&
 	test_line_count = 4 output
 '
 
@@ -246,7 +298,7 @@ test_expect_success 'gc.reflogexpire=false' '
 	test_config gc.reflogexpireunreachable false &&
 
 	git reflog expire --verbose --all &&
-	git reflog refs/heads/master >output &&
+	git reflog refs/heads/main >output &&
 	test_line_count = 4 output
 
 '
@@ -255,33 +307,33 @@ test_expect_success 'git reflog expire unknown reference' '
 	test_config gc.reflogexpire never &&
 	test_config gc.reflogexpireunreachable never &&
 
-	test_must_fail git reflog expire master@{123} 2>stderr &&
-	test_i18ngrep "points nowhere" stderr &&
+	test_must_fail git reflog expire main@{123} 2>stderr &&
+	test_grep "points nowhere" stderr &&
 	test_must_fail git reflog expire does-not-exist 2>stderr &&
-	test_i18ngrep "points nowhere" stderr
+	test_grep "points nowhere" stderr
 '
 
 test_expect_success 'checkout should not delete log for packed ref' '
-	test $(git reflog master | wc -l) = 4 &&
+	test $(git reflog main | wc -l) = 4 &&
 	git branch foo &&
 	git pack-refs --all &&
 	git checkout foo &&
-	test $(git reflog master | wc -l) = 4
+	test $(git reflog main | wc -l) = 4
 '
 
 test_expect_success 'stale dirs do not cause d/f conflicts (reflogs on)' '
 	test_when_finished "git branch -d one || git branch -d one/two" &&
 
-	git branch one/two master &&
-	echo "one/two@{0} branch: Created from master" >expect &&
+	git branch one/two main &&
+	echo "one/two@{0} branch: Created from main" >expect &&
 	git log -g --format="%gd %gs" one/two >actual &&
 	test_cmp expect actual &&
 	git branch -d one/two &&
 
 	# now logs/refs/heads/one is a stale directory, but
 	# we should move it out of the way to create "one" reflog
-	git branch one master &&
-	echo "one@{0} branch: Created from master" >expect &&
+	git branch one main &&
+	echo "one@{0} branch: Created from main" >expect &&
 	git log -g --format="%gd %gs" one >actual &&
 	test_cmp expect actual
 '
@@ -289,49 +341,19 @@ test_expect_success 'stale dirs do not cause d/f conflicts (reflogs on)' '
 test_expect_success 'stale dirs do not cause d/f conflicts (reflogs off)' '
 	test_when_finished "git branch -d one || git branch -d one/two" &&
 
-	git branch one/two master &&
-	echo "one/two@{0} branch: Created from master" >expect &&
+	git branch one/two main &&
+	echo "one/two@{0} branch: Created from main" >expect &&
 	git log -g --format="%gd %gs" one/two >actual &&
 	test_cmp expect actual &&
 	git branch -d one/two &&
 
 	# same as before, but we only create a reflog for "one" if
 	# it already exists, which it does not
-	git -c core.logallrefupdates=false branch one master &&
+	git -c core.logallrefupdates=false branch one main &&
 	git log -g --format="%gd %gs" one >actual &&
 	test_must_be_empty actual
 '
 
-# Triggering the bug detected by this test requires a newline to fall
-# exactly BUFSIZ-1 bytes from the end of the file. We don't know
-# what that value is, since it's platform dependent. However, if
-# we choose some value N, we also catch any D which divides N evenly
-# (since we will read backwards in chunks of D). So we choose 8K,
-# which catches glibc (with an 8K BUFSIZ) and *BSD (1K).
-#
-# Each line is 114 characters, so we need 75 to still have a few before the
-# last 8K. The 89-character padding on the final entry lines up our
-# newline exactly.
-test_expect_success SHA1 'parsing reverse reflogs at BUFSIZ boundaries' '
-	git checkout -b reflogskip &&
-	zf=$(test_oid zero_2) &&
-	ident="abc <xyz> 0000000001 +0000" &&
-	for i in $(test_seq 1 75); do
-		printf "$zf%02d $zf%02d %s\t" $i $(($i+1)) "$ident" &&
-		if test $i = 75; then
-			for j in $(test_seq 1 89); do
-				printf X
-			done
-		else
-			printf X
-		fi &&
-		printf "\n"
-	done >.git/logs/refs/heads/reflogskip &&
-	git rev-parse reflogskip@{73} >actual &&
-	echo ${zf}03 >expect &&
-	test_cmp expect actual
-'
-
 test_expect_success 'no segfaults for reflog containing non-commit sha1s' '
 	git update-ref --create-reflog -m "Creating ref" \
 		refs/tests/tree-in-reflog HEAD &&
@@ -345,16 +367,6 @@ test_expect_failure 'reflog with non-commit entries displays all entries' '
 	test_line_count = 3 actual
 '
 
-test_expect_success 'reflog expire operates on symref not referrent' '
-	git branch --create-reflog the_symref &&
-	git branch --create-reflog referrent &&
-	git update-ref referrent HEAD &&
-	git symbolic-ref refs/heads/the_symref refs/heads/referrent &&
-	test_when_finished "rm -f .git/refs/heads/referrent.lock" &&
-	touch .git/refs/heads/referrent.lock &&
-	git reflog expire --expire=all the_symref
-'
-
 test_expect_success 'continue walking past root commits' '
 	git init orphanage &&
 	(
@@ -387,7 +399,148 @@ test_expect_success 'expire with multiple worktrees' '
 		test_commit -C link-wt foobar &&
 		test_tick &&
 		git reflog expire --verbose --all --expire=$test_tick &&
-		test_must_be_empty .git/worktrees/link-wt/logs/HEAD
+		test-tool ref-store worktree:link-wt for-each-reflog-ent HEAD >actual &&
+		test_must_be_empty actual
+	)
+'
+
+test_expect_success 'expire one of multiple worktrees' '
+	git init main-wt2 &&
+	(
+		cd main-wt2 &&
+		test_tick &&
+		test_commit foo &&
+		git worktree add link-wt &&
+		test_tick &&
+		test_commit -C link-wt foobar &&
+		test_tick &&
+		test-tool ref-store worktree:link-wt for-each-reflog-ent HEAD \
+			>expect-link-wt &&
+		git reflog expire --verbose --all --expire=$test_tick \
+			--single-worktree &&
+		test-tool ref-store worktree:main for-each-reflog-ent HEAD \
+			>actual-main &&
+		test-tool ref-store worktree:link-wt for-each-reflog-ent HEAD \
+			>actual-link-wt &&
+		test_must_be_empty actual-main &&
+		test_cmp expect-link-wt actual-link-wt
+	)
+'
+
+test_expect_success 'empty reflog' '
+	test_when_finished "rm -rf empty" &&
+	git init empty &&
+	test_commit -C empty A &&
+	test-tool ref-store main create-reflog refs/heads/foo &&
+	git -C empty reflog expire --all 2>err &&
+	test_must_be_empty err
+'
+
+test_expect_success 'list reflogs' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	(
+		cd repo &&
+		git reflog list >actual &&
+		test_must_be_empty actual &&
+
+		test_commit A &&
+		cat >expect <<-EOF &&
+		HEAD
+		refs/heads/main
+		EOF
+		git reflog list >actual &&
+		test_cmp expect actual &&
+
+		git branch b &&
+		cat >expect <<-EOF &&
+		HEAD
+		refs/heads/b
+		refs/heads/main
+		EOF
+		git reflog list >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'list reflogs with worktree' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	(
+		cd repo &&
+
+		test_commit A &&
+		git worktree add wt &&
+		git -c core.logAllRefUpdates=always \
+			update-ref refs/worktree/main HEAD &&
+		git -c core.logAllRefUpdates=always \
+			update-ref refs/worktree/per-worktree HEAD &&
+		git -c core.logAllRefUpdates=always -C wt \
+			update-ref refs/worktree/per-worktree HEAD &&
+		git -c core.logAllRefUpdates=always -C wt \
+			update-ref refs/worktree/worktree HEAD &&
+
+		cat >expect <<-EOF &&
+		HEAD
+		refs/heads/main
+		refs/heads/wt
+		refs/worktree/main
+		refs/worktree/per-worktree
+		EOF
+		git reflog list >actual &&
+		test_cmp expect actual &&
+
+		cat >expect <<-EOF &&
+		HEAD
+		refs/heads/main
+		refs/heads/wt
+		refs/worktree/per-worktree
+		refs/worktree/worktree
+		EOF
+		git -C wt reflog list >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'reflog list returns error with additional args' '
+	cat >expect <<-EOF &&
+	error: list does not accept arguments: ${SQ}bogus${SQ}
+	EOF
+	test_must_fail git reflog list bogus 2>err &&
+	test_cmp expect err
+'
+
+test_expect_success 'reflog for symref with unborn target can be listed' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	(
+		cd repo &&
+		test_commit A &&
+		git symbolic-ref HEAD refs/heads/unborn &&
+		cat >expect <<-EOF &&
+		HEAD
+		refs/heads/main
+		EOF
+		git reflog list >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'reflog with invalid object ID can be listed' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	(
+		cd repo &&
+		test_commit A &&
+		test-tool ref-store main update-ref msg refs/heads/missing \
+			$(test_oid deadbeef) "$ZERO_OID" REF_SKIP_OID_VERIFICATION &&
+		cat >expect <<-EOF &&
+		HEAD
+		refs/heads/main
+		refs/heads/missing
+		EOF
+		git reflog list >actual &&
+		test_cmp expect actual
 	)
 '
 
diff --git a/t/t1411-reflog-show.sh b/t/t1411-reflog-show.sh
index 985daf1..da581ec 100755
--- a/t/t1411-reflog-show.sh
+++ b/t/t1411-reflog-show.sh
@@ -1,6 +1,10 @@
 #!/bin/sh
 
 test_description='Test reflog display routines'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -166,9 +170,4 @@ test_expect_success 'git log -g -p shows diffs vs. parents' '
 	test_cmp expect actual
 '
 
-test_expect_success 'reflog exists works' '
-	git reflog exists refs/heads/master &&
-	! git reflog exists refs/heads/nonexistent
-'
-
 test_done
diff --git a/t/t1412-reflog-loop.sh b/t/t1412-reflog-loop.sh
index 3acd895..ff30874 100755
--- a/t/t1412-reflog-loop.sh
+++ b/t/t1412-reflog-loop.sh
@@ -1,14 +1,13 @@
 #!/bin/sh
 
 test_description='reflog walk shows repeated commits again'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup commits' '
-	test_tick &&
-	echo content >file && git add file && git commit -m one &&
-	git tag one &&
-	echo content >>file && git add file && git commit -m two &&
-	git tag two
+	test_commit one file content &&
+	test_commit --append two file content
 '
 
 test_expect_success 'setup reflog with alternating commits' '
diff --git a/t/t1413-reflog-detach.sh b/t/t1413-reflog-detach.sh
index c730600..d2a4822 100755
--- a/t/t1413-reflog-detach.sh
+++ b/t/t1413-reflog-detach.sh
@@ -1,11 +1,14 @@
 #!/bin/sh
 
 test_description='Test reflog interaction with detached HEAD'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 reset_state () {
-	git checkout master &&
-	cp saved_reflog .git/logs/HEAD
+	rm -rf .git && "$TAR" xf .git-saved.tar
 }
 
 test_expect_success setup '
@@ -14,19 +17,19 @@ test_expect_success setup '
 	git branch side &&
 	test_tick &&
 	git commit --allow-empty -m second &&
-	cat .git/logs/HEAD >saved_reflog
+	"$TAR" cf .git-saved.tar .git
 '
 
 test_expect_success baseline '
 	reset_state &&
-	git rev-parse master master^ >expect &&
+	git rev-parse main main^ >expect &&
 	git log -g --format=%H >actual &&
 	test_cmp expect actual
 '
 
 test_expect_success 'switch to branch' '
 	reset_state &&
-	git rev-parse side master master^ >expect &&
+	git rev-parse side main main^ >expect &&
 	git checkout side &&
 	git log -g --format=%H >actual &&
 	test_cmp expect actual
@@ -34,34 +37,34 @@ test_expect_success 'switch to branch' '
 
 test_expect_success 'detach to other' '
 	reset_state &&
-	git rev-parse master side master master^ >expect &&
+	git rev-parse main side main main^ >expect &&
 	git checkout side &&
-	git checkout master^0 &&
+	git checkout main^0 &&
 	git log -g --format=%H >actual &&
 	test_cmp expect actual
 '
 
 test_expect_success 'detach to self' '
 	reset_state &&
-	git rev-parse master master master^ >expect &&
-	git checkout master^0 &&
+	git rev-parse main main main^ >expect &&
+	git checkout main^0 &&
 	git log -g --format=%H >actual &&
 	test_cmp expect actual
 '
 
 test_expect_success 'attach to self' '
 	reset_state &&
-	git rev-parse master master master master^ >expect &&
-	git checkout master^0 &&
-	git checkout master &&
+	git rev-parse main main main main^ >expect &&
+	git checkout main^0 &&
+	git checkout main &&
 	git log -g --format=%H >actual &&
 	test_cmp expect actual
 '
 
 test_expect_success 'attach to other' '
 	reset_state &&
-	git rev-parse side master master master^ >expect &&
-	git checkout master^0 &&
+	git rev-parse side main main main^ >expect &&
+	git checkout main^0 &&
 	git checkout side &&
 	git log -g --format=%H >actual &&
 	test_cmp expect actual
diff --git a/t/t1414-reflog-walk.sh b/t/t1414-reflog-walk.sh
index 1181a9f..be6c3f4 100755
--- a/t/t1414-reflog-walk.sh
+++ b/t/t1414-reflog-walk.sh
@@ -1,6 +1,9 @@
 #!/bin/sh
 
 test_description='various tests of reflog walk (log -g) behavior'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 test_expect_success 'set up some reflog entries' '
@@ -8,7 +11,7 @@ test_expect_success 'set up some reflog entries' '
 	test_commit two &&
 	git checkout -b side HEAD^ &&
 	test_commit three &&
-	git merge --no-commit master &&
+	git merge --no-commit main &&
 	echo evil-merge-content >>one.t &&
 	test_tick &&
 	git commit --no-edit -a
@@ -20,9 +23,9 @@ do_walk () {
 
 test_expect_success 'set up expected reflog' '
 	cat >expect.all <<-EOF
-	HEAD@{0} commit (merge): Merge branch ${SQ}master${SQ} into side
+	HEAD@{0} commit (merge): Merge branch ${SQ}main${SQ} into side
 	HEAD@{1} commit: three
-	HEAD@{2} checkout: moving from master to side
+	HEAD@{2} checkout: moving from main to side
 	HEAD@{3} commit: two
 	HEAD@{4} commit (initial): one
 	EOF
@@ -73,15 +76,15 @@ test_expect_success 'walking multiple reflogs shows all' '
 	#      sort ignores the bits after the timestamp.
 	#
 	#   2. POSIX leaves undefined whether this is a stable sort or not. So
-	#      we use "-k 1" to ensure that we see HEAD before master before
+	#      we use "-k 1" to ensure that we see HEAD before main before
 	#      side when breaking ties.
 	{
 		do_walk --date=unix HEAD &&
 		do_walk --date=unix side &&
-		do_walk --date=unix master
+		do_walk --date=unix main
 	} >expect.raw &&
 	sort -t "{" -k 2nr -k 1 <expect.raw >expect &&
-	do_walk --date=unix HEAD master side >actual &&
+	do_walk --date=unix HEAD main side >actual &&
 	test_cmp expect actual
 '
 
@@ -116,13 +119,14 @@ test_expect_success 'min/max age uses entry date to limit' '
 	test_cmp expect actual
 '
 
+# Create a situation where the reflog and ref database disagree about the latest
+# state of HEAD.
 test_expect_success 'walk prefers reflog to ref tip' '
+	test_commit A &&
+	test_commit B &&
+	git reflog delete HEAD@{0} &&
 	head=$(git rev-parse HEAD) &&
-	one=$(git rev-parse one) &&
-	ident="$GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> $GIT_COMMITTER_DATE" &&
-	echo "$head $one $ident	broken reflog entry" >>.git/logs/HEAD &&
-
-	echo $one >expect &&
+	git rev-parse A >expect &&
 	git log -g --format=%H -1 >actual &&
 	test_cmp expect actual
 '
diff --git a/t/t1415-worktree-refs.sh b/t/t1415-worktree-refs.sh
index bb2c757..eb4eec8 100755
--- a/t/t1415-worktree-refs.sh
+++ b/t/t1415-worktree-refs.sh
@@ -2,6 +2,7 @@
 
 test_description='per-worktree refs'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -16,14 +17,6 @@ test_expect_success 'setup' '
 	git -C wt2 update-ref refs/worktree/foo HEAD
 '
 
-test_expect_success 'refs/worktree must not be packed' '
-	git pack-refs --all &&
-	test_path_is_missing .git/refs/tags/wt1 &&
-	test_path_is_file .git/refs/worktree/foo &&
-	test_path_is_file .git/worktrees/wt1/refs/worktree/foo &&
-	test_path_is_file .git/worktrees/wt2/refs/worktree/foo
-'
-
 test_expect_success 'refs/worktree are per-worktree' '
 	test_cmp_rev worktree/foo initial &&
 	( cd wt1 && test_cmp_rev worktree/foo wt1 ) &&
@@ -37,9 +30,8 @@ test_expect_success 'resolve main-worktree/HEAD' '
 '
 
 test_expect_success 'ambiguous main-worktree/HEAD' '
-	mkdir -p .git/refs/heads/main-worktree &&
-	test_when_finished rm -f .git/refs/heads/main-worktree/HEAD &&
-	cp .git/HEAD .git/refs/heads/main-worktree/HEAD &&
+	test_when_finished git update-ref -d refs/heads/main-worktree/HEAD &&
+	git update-ref refs/heads/main-worktree/HEAD $(git rev-parse HEAD) &&
 	git rev-parse main-worktree/HEAD 2>warn &&
 	grep "main-worktree/HEAD.*ambiguous" warn
 '
@@ -51,9 +43,8 @@ test_expect_success 'resolve worktrees/xx/HEAD' '
 '
 
 test_expect_success 'ambiguous worktrees/xx/HEAD' '
-	mkdir -p .git/refs/heads/worktrees/wt1 &&
-	test_when_finished rm -f .git/refs/heads/worktrees/wt1/HEAD &&
-	cp .git/HEAD .git/refs/heads/worktrees/wt1/HEAD &&
+	git update-ref refs/heads/worktrees/wt1/HEAD $(git rev-parse HEAD) &&
+	test_when_finished git update-ref -d refs/heads/worktrees/wt1/HEAD &&
 	git rev-parse worktrees/wt1/HEAD 2>warn &&
 	grep "worktrees/wt1/HEAD.*ambiguous" warn
 '
@@ -76,24 +67,24 @@ test_expect_success 'reflog of worktrees/xx/HEAD' '
 	test_cmp expected actual.wt2
 '
 
-test_expect_success 'for-each-ref from main repo' '
+test_expect_success 'for-each-ref from main worktree' '
 	mkdir fer1 &&
 	git -C fer1 init repo &&
 	test_commit -C fer1/repo initial &&
 	git -C fer1/repo worktree add ../second &&
-	git -C fer1/repo update-ref refs/bisect/main HEAD &&
-	git -C fer1/repo update-ref refs/rewritten/main HEAD &&
-	git -C fer1/repo update-ref refs/worktree/main HEAD &&
-	git -C fer1/repo for-each-ref --format="%(refname)" | grep main >actual &&
+	git -C fer1/repo update-ref refs/bisect/first HEAD &&
+	git -C fer1/repo update-ref refs/rewritten/first HEAD &&
+	git -C fer1/repo update-ref refs/worktree/first HEAD &&
+	git -C fer1/repo for-each-ref --format="%(refname)" | grep first >actual &&
 	cat >expected <<-\EOF &&
-	refs/bisect/main
-	refs/rewritten/main
-	refs/worktree/main
+	refs/bisect/first
+	refs/rewritten/first
+	refs/worktree/first
 	EOF
 	test_cmp expected actual
 '
 
-test_expect_success 'for-each-ref from linked repo' '
+test_expect_success 'for-each-ref from linked worktree' '
 	mkdir fer2 &&
 	git -C fer2 init repo &&
 	test_commit -C fer2/repo initial &&
diff --git a/t/t1416-ref-transaction-hooks.sh b/t/t1416-ref-transaction-hooks.sh
index da58d86..2092488 100755
--- a/t/t1416-ref-transaction-hooks.sh
+++ b/t/t1416-ref-transaction-hooks.sh
@@ -2,19 +2,22 @@
 
 test_description='reference transaction hooks'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
-	mkdir -p .git/hooks &&
 	test_commit PRE &&
+	PRE_OID=$(git rev-parse PRE) &&
 	test_commit POST &&
 	POST_OID=$(git rev-parse POST)
 '
 
 test_expect_success 'hook allows updating ref if successful' '
-	test_when_finished "rm .git/hooks/reference-transaction" &&
 	git reset --hard PRE &&
-	write_script .git/hooks/reference-transaction <<-\EOF &&
+	test_hook reference-transaction <<-\EOF &&
 		echo "$*" >>actual
 	EOF
 	cat >expect <<-EOF &&
@@ -26,22 +29,21 @@ test_expect_success 'hook allows updating ref if successful' '
 '
 
 test_expect_success 'hook aborts updating ref in prepared state' '
-	test_when_finished "rm .git/hooks/reference-transaction" &&
 	git reset --hard PRE &&
-	write_script .git/hooks/reference-transaction <<-\EOF &&
+	test_hook reference-transaction <<-\EOF &&
 		if test "$1" = prepared
 		then
 			exit 1
 		fi
 	EOF
 	test_must_fail git update-ref HEAD POST 2>err &&
-	test_i18ngrep "ref updates aborted by hook" err
+	test_grep "ref updates aborted by hook" err
 '
 
 test_expect_success 'hook gets all queued updates in prepared state' '
-	test_when_finished "rm .git/hooks/reference-transaction actual" &&
+	test_when_finished "rm actual" &&
 	git reset --hard PRE &&
-	write_script .git/hooks/reference-transaction <<-\EOF &&
+	test_hook reference-transaction <<-\EOF &&
 		if test "$1" = prepared
 		then
 			while read -r line
@@ -52,19 +54,19 @@ test_expect_success 'hook gets all queued updates in prepared state' '
 	EOF
 	cat >expect <<-EOF &&
 		$ZERO_OID $POST_OID HEAD
-		$ZERO_OID $POST_OID refs/heads/master
+		$ZERO_OID $POST_OID refs/heads/main
 	EOF
 	git update-ref HEAD POST <<-EOF &&
 		update HEAD $ZERO_OID $POST_OID
-		update refs/heads/master $ZERO_OID $POST_OID
+		update refs/heads/main $ZERO_OID $POST_OID
 	EOF
 	test_cmp expect actual
 '
 
 test_expect_success 'hook gets all queued updates in committed state' '
-	test_when_finished "rm .git/hooks/reference-transaction actual" &&
+	test_when_finished "rm actual" &&
 	git reset --hard PRE &&
-	write_script .git/hooks/reference-transaction <<-\EOF &&
+	test_hook reference-transaction <<-\EOF &&
 		if test "$1" = committed
 		then
 			while read -r line
@@ -75,16 +77,16 @@ test_expect_success 'hook gets all queued updates in committed state' '
 	EOF
 	cat >expect <<-EOF &&
 		$ZERO_OID $POST_OID HEAD
-		$ZERO_OID $POST_OID refs/heads/master
+		$ZERO_OID $POST_OID refs/heads/main
 	EOF
 	git update-ref HEAD POST &&
 	test_cmp expect actual
 '
 
 test_expect_success 'hook gets all queued updates in aborted state' '
-	test_when_finished "rm .git/hooks/reference-transaction actual" &&
+	test_when_finished "rm actual" &&
 	git reset --hard PRE &&
-	write_script .git/hooks/reference-transaction <<-\EOF &&
+	test_hook reference-transaction <<-\EOF &&
 		if test "$1" = aborted
 		then
 			while read -r line
@@ -95,15 +97,41 @@ test_expect_success 'hook gets all queued updates in aborted state' '
 	EOF
 	cat >expect <<-EOF &&
 		$ZERO_OID $POST_OID HEAD
-		$ZERO_OID $POST_OID refs/heads/master
+		$ZERO_OID $POST_OID refs/heads/main
 	EOF
 	git update-ref --stdin <<-EOF &&
 		start
 		update HEAD POST $ZERO_OID
-		update refs/heads/master POST $ZERO_OID
+		update refs/heads/main POST $ZERO_OID
 		abort
 	EOF
 	test_cmp expect actual
 '
 
+test_expect_success 'interleaving hook calls succeed' '
+	test_when_finished "rm -r target-repo.git" &&
+
+	git init --bare target-repo.git &&
+
+	test_hook -C target-repo.git reference-transaction <<-\EOF &&
+		echo $0 "$@" >>actual
+	EOF
+
+	test_hook -C target-repo.git update <<-\EOF &&
+		echo $0 "$@" >>actual
+	EOF
+
+	cat >expect <<-EOF &&
+		hooks/update refs/tags/PRE $ZERO_OID $PRE_OID
+		hooks/reference-transaction prepared
+		hooks/reference-transaction committed
+		hooks/update refs/tags/POST $ZERO_OID $POST_OID
+		hooks/reference-transaction prepared
+		hooks/reference-transaction committed
+	EOF
+
+	git push ./target-repo.git PRE POST &&
+	test_cmp expect target-repo.git/actual
+'
+
 test_done
diff --git a/t/t1417-reflog-updateref.sh b/t/t1417-reflog-updateref.sh
new file mode 100755
index 0000000..0eb5e67
--- /dev/null
+++ b/t/t1417-reflog-updateref.sh
@@ -0,0 +1,69 @@
+#!/bin/sh
+
+test_description='git reflog --updateref'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+test_expect_success 'setup' '
+	git init -b main repo &&
+	(
+		cd repo &&
+
+		test_commit A &&
+		test_commit B &&
+		test_commit C &&
+
+		git reflog HEAD >expect &&
+		git reset --hard HEAD~ &&
+		# Make sure that the reflog does not point to the same commit
+		# as HEAD.
+		git reflog delete HEAD@{0} &&
+		git reflog HEAD >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_reflog_updateref () {
+	exp=$1
+	shift
+	args="$@"
+
+	test_expect_success "get '$exp' with '$args'"  '
+		test_when_finished "rm -rf copy" &&
+		cp -R repo copy &&
+
+		(
+			cd copy &&
+
+			$args &&
+			git rev-parse $exp >expect &&
+			git rev-parse HEAD >actual &&
+
+			test_cmp expect actual
+		)
+	'
+}
+
+test_reflog_updateref B git reflog delete --updateref HEAD@{0}
+test_reflog_updateref B git reflog delete --updateref HEAD@{1}
+test_reflog_updateref C git reflog delete --updateref main@{0}
+test_reflog_updateref B git reflog delete --updateref main@{1}
+test_reflog_updateref B git reflog delete --updateref --rewrite HEAD@{0}
+test_reflog_updateref B git reflog delete --updateref --rewrite HEAD@{1}
+test_reflog_updateref C git reflog delete --updateref --rewrite main@{0}
+test_reflog_updateref B git reflog delete --updateref --rewrite main@{1}
+test_reflog_updateref B test_must_fail git reflog expire  HEAD@{0}
+test_reflog_updateref B test_must_fail git reflog expire  HEAD@{1}
+test_reflog_updateref B test_must_fail git reflog expire  main@{0}
+test_reflog_updateref B test_must_fail git reflog expire  main@{1}
+test_reflog_updateref B test_must_fail git reflog expire --updateref HEAD@{0}
+test_reflog_updateref B test_must_fail git reflog expire --updateref HEAD@{1}
+test_reflog_updateref B test_must_fail git reflog expire --updateref main@{0}
+test_reflog_updateref B test_must_fail git reflog expire --updateref main@{1}
+test_reflog_updateref B test_must_fail git reflog expire --updateref --rewrite HEAD@{0}
+test_reflog_updateref B test_must_fail git reflog expire --updateref --rewrite HEAD@{1}
+test_reflog_updateref B test_must_fail git reflog expire --updateref --rewrite main@{0}
+test_reflog_updateref B test_must_fail git reflog expire --updateref --rewrite main@{1}
+
+test_done
diff --git a/t/t1418-reflog-exists.sh b/t/t1418-reflog-exists.sh
new file mode 100755
index 0000000..2268bca
--- /dev/null
+++ b/t/t1418-reflog-exists.sh
@@ -0,0 +1,38 @@
+#!/bin/sh
+
+test_description='Test reflog display routines'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+test_expect_success 'setup' '
+	test_commit A
+'
+
+test_expect_success 'usage' '
+	test_expect_code 129 git reflog exists &&
+	test_expect_code 129 git reflog exists -h
+'
+
+test_expect_success 'usage: unknown option' '
+	test_expect_code 129 git reflog exists --unknown-option
+'
+
+test_expect_success 'reflog exists works' '
+	git reflog exists refs/heads/main &&
+	test_must_fail git reflog exists refs/heads/nonexistent
+'
+
+test_expect_success 'reflog exists works with a "--" delimiter' '
+	git reflog exists -- refs/heads/main &&
+	test_must_fail git reflog exists -- refs/heads/nonexistent
+'
+
+test_expect_success 'reflog exists works with a "--end-of-options" delimiter' '
+	git reflog exists --end-of-options refs/heads/main &&
+	test_must_fail git reflog exists --end-of-options refs/heads/nonexistent
+'
+
+test_done
diff --git a/t/t1419-exclude-refs.sh b/t/t1419-exclude-refs.sh
new file mode 100755
index 0000000..1359574
--- /dev/null
+++ b/t/t1419-exclude-refs.sh
@@ -0,0 +1,128 @@
+#!/bin/sh
+
+test_description='test exclude_patterns functionality in main ref store'
+
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+if test_have_prereq !REFFILES
+then
+	skip_all='skipping `git for-each-ref --exclude` tests; need files backend'
+	test_done
+fi
+
+for_each_ref__exclude () {
+	GIT_TRACE2_PERF=1 test-tool ref-store main \
+		for-each-ref--exclude "$@" >actual.raw
+	cut -d ' ' -f 2 actual.raw
+}
+
+for_each_ref () {
+	git for-each-ref --format='%(refname)' "$@"
+}
+
+assert_jumps () {
+	local nr="$1"
+	local trace="$2"
+
+	grep -q "name:jumps_made value:$nr$" $trace
+}
+
+assert_no_jumps () {
+	! assert_jumps ".*" "$1"
+}
+
+test_expect_success 'setup' '
+	test_commit --no-tag base &&
+	base="$(git rev-parse HEAD)" &&
+
+	for name in foo bar baz quux
+	do
+		for i in 1 2 3
+		do
+			echo "create refs/heads/$name/$i $base" || return 1
+		done || return 1
+	done >in &&
+	echo "delete refs/heads/main" >>in &&
+
+	git update-ref --stdin <in &&
+	git pack-refs --all
+'
+
+test_expect_success 'excluded region in middle' '
+	for_each_ref__exclude refs/heads refs/heads/foo >actual 2>perf &&
+	for_each_ref refs/heads/bar refs/heads/baz refs/heads/quux >expect &&
+
+	test_cmp expect actual &&
+	assert_jumps 1 perf
+'
+
+test_expect_success 'excluded region at beginning' '
+	for_each_ref__exclude refs/heads refs/heads/bar >actual 2>perf &&
+	for_each_ref refs/heads/baz refs/heads/foo refs/heads/quux >expect &&
+
+	test_cmp expect actual &&
+	assert_jumps 1 perf
+'
+
+test_expect_success 'excluded region at end' '
+	for_each_ref__exclude refs/heads refs/heads/quux >actual 2>perf &&
+	for_each_ref refs/heads/foo refs/heads/bar refs/heads/baz >expect &&
+
+	test_cmp expect actual &&
+	assert_jumps 1 perf
+'
+
+test_expect_success 'disjoint excluded regions' '
+	for_each_ref__exclude refs/heads refs/heads/bar refs/heads/quux >actual 2>perf &&
+	for_each_ref refs/heads/baz refs/heads/foo >expect &&
+
+	test_cmp expect actual &&
+	assert_jumps 2 perf
+'
+
+test_expect_success 'adjacent, non-overlapping excluded regions' '
+	for_each_ref__exclude refs/heads refs/heads/bar refs/heads/baz >actual 2>perf &&
+	for_each_ref refs/heads/foo refs/heads/quux >expect &&
+
+	test_cmp expect actual &&
+	assert_jumps 1 perf
+'
+
+test_expect_success 'overlapping excluded regions' '
+	for_each_ref__exclude refs/heads refs/heads/ba refs/heads/baz >actual 2>perf &&
+	for_each_ref refs/heads/foo refs/heads/quux >expect &&
+
+	test_cmp expect actual &&
+	assert_jumps 1 perf
+'
+
+test_expect_success 'several overlapping excluded regions' '
+	for_each_ref__exclude refs/heads \
+		refs/heads/bar refs/heads/baz refs/heads/foo >actual 2>perf &&
+	for_each_ref refs/heads/quux >expect &&
+
+	test_cmp expect actual &&
+	assert_jumps 1 perf
+'
+
+test_expect_success 'non-matching excluded section' '
+	for_each_ref__exclude refs/heads refs/heads/does/not/exist >actual 2>perf &&
+	for_each_ref >expect &&
+
+	test_cmp expect actual &&
+	assert_no_jumps perf
+'
+
+test_expect_success 'meta-characters are discarded' '
+	for_each_ref__exclude refs/heads "refs/heads/ba*" >actual 2>perf &&
+	for_each_ref >expect &&
+
+	test_cmp expect actual &&
+	assert_no_jumps perf
+'
+
+test_done
diff --git a/t/t1420-lost-found.sh b/t/t1420-lost-found.sh
index dc9e402..dbe15a0 100755
--- a/t/t1420-lost-found.sh
+++ b/t/t1420-lost-found.sh
@@ -4,6 +4,8 @@
 #
 
 test_description='Test fsck --lost-found'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
diff --git a/t/t1430-bad-ref-name.sh b/t/t1430-bad-ref-name.sh
index c7878a6..0c00118 100755
--- a/t/t1430-bad-ref-name.sh
+++ b/t/t1430-bad-ref-name.sh
@@ -1,11 +1,16 @@
 #!/bin/sh
 
 test_description='Test handling of ref names that check-ref-format rejects'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
 	test_commit one &&
-	test_commit two
+	test_commit two &&
+	main_sha1=$(git rev-parse refs/heads/main)
 '
 
 test_expect_success 'fast-import: fail on invalid branch name ".badbranchname"' '
@@ -17,7 +22,7 @@ test_expect_success 'fast-import: fail on invalid branch name ".badbranchname"'
 		corrupt
 		COMMIT
 
-		from refs/heads/master
+		from refs/heads/main
 
 	INPUT_END
 	test_must_fail git fast-import <input
@@ -32,23 +37,23 @@ test_expect_success 'fast-import: fail on invalid branch name "bad[branch]name"'
 		corrupt
 		COMMIT
 
-		from refs/heads/master
+		from refs/heads/main
 
 	INPUT_END
 	test_must_fail git fast-import <input
 '
 
 test_expect_success 'git branch shows badly named ref as warning' '
-	cp .git/refs/heads/master .git/refs/heads/broken...ref &&
-	test_when_finished "rm -f .git/refs/heads/broken...ref" &&
+	test-tool ref-store main update-ref msg "refs/heads/broken...ref" $main_sha1 $ZERO_OID REF_SKIP_REFNAME_VERIFICATION &&
+	test_when_finished "test-tool ref-store main delete-refs REF_NO_DEREF msg refs/heads/broken...ref" &&
 	git branch >output 2>error &&
-	test_i18ngrep -e "ignoring ref with broken name refs/heads/broken\.\.\.ref" error &&
+	test_grep -e "ignoring ref with broken name refs/heads/broken\.\.\.ref" error &&
 	! grep -e "broken\.\.\.ref" output
 '
 
 test_expect_success 'branch -d can delete badly named ref' '
-	cp .git/refs/heads/master .git/refs/heads/broken...ref &&
-	test_when_finished "rm -f .git/refs/heads/broken...ref" &&
+	test-tool ref-store main update-ref msg "refs/heads/broken...ref" $main_sha1 $ZERO_OID REF_SKIP_REFNAME_VERIFICATION &&
+	test_when_finished "test-tool ref-store main delete-refs REF_NO_DEREF msg refs/heads/broken...ref" &&
 	git branch -d broken...ref &&
 	git branch >output 2>error &&
 	! grep -e "broken\.\.\.ref" error &&
@@ -56,8 +61,8 @@ test_expect_success 'branch -d can delete badly named ref' '
 '
 
 test_expect_success 'branch -D can delete badly named ref' '
-	cp .git/refs/heads/master .git/refs/heads/broken...ref &&
-	test_when_finished "rm -f .git/refs/heads/broken...ref" &&
+	test-tool ref-store main update-ref msg "refs/heads/broken...ref" $main_sha1 $ZERO_OID REF_SKIP_REFNAME_VERIFICATION &&
+	test_when_finished "test-tool ref-store main delete-refs REF_NO_DEREF msg refs/heads/broken...ref" &&
 	git branch -D broken...ref &&
 	git branch >output 2>error &&
 	! grep -e "broken\.\.\.ref" error &&
@@ -86,7 +91,7 @@ test_expect_success 'branch -D cannot delete absolute path' '
 '
 
 test_expect_success 'git branch cannot create a badly named ref' '
-	test_when_finished "rm -f .git/refs/heads/broken...ref" &&
+	test_when_finished "test-tool ref-store main delete-refs REF_NO_DEREF msg refs/heads/broken...ref" &&
 	test_must_fail git branch broken...ref &&
 	git branch >output 2>error &&
 	! grep -e "broken\.\.\.ref" error &&
@@ -94,35 +99,36 @@ test_expect_success 'git branch cannot create a badly named ref' '
 '
 
 test_expect_success 'branch -m cannot rename to a bad ref name' '
-	test_when_finished "rm -f .git/refs/heads/broken...ref" &&
+	test_when_finished "test-tool ref-store main delete-refs REF_NO_DEREF msg refs/heads/broken...ref" &&
 	test_might_fail git branch -D goodref &&
 	git branch goodref &&
 	test_must_fail git branch -m goodref broken...ref &&
-	test_cmp_rev master goodref &&
+	test_cmp_rev main goodref &&
 	git branch >output 2>error &&
 	! grep -e "broken\.\.\.ref" error &&
 	! grep -e "broken\.\.\.ref" output
 '
 
 test_expect_failure 'branch -m can rename from a bad ref name' '
-	cp .git/refs/heads/master .git/refs/heads/broken...ref &&
-	test_when_finished "rm -f .git/refs/heads/broken...ref" &&
+	test-tool ref-store main update-ref msg "refs/heads/broken...ref" $main_sha1 $ZERO_OID REF_SKIP_REFNAME_VERIFICATION &&
+
+	test_when_finished "test-tool ref-store main delete-refs REF_NO_DEREF msg refs/heads/broken...ref" &&
 	git branch -m broken...ref renamed &&
-	test_cmp_rev master renamed &&
+	test_cmp_rev main renamed &&
 	git branch >output 2>error &&
 	! grep -e "broken\.\.\.ref" error &&
 	! grep -e "broken\.\.\.ref" output
 '
 
 test_expect_success 'push cannot create a badly named ref' '
-	test_when_finished "rm -f .git/refs/heads/broken...ref" &&
+	test_when_finished "test-tool ref-store main delete-refs REF_NO_DEREF msg refs/heads/broken...ref" &&
 	test_must_fail git push "file://$(pwd)" HEAD:refs/heads/broken...ref &&
 	git branch >output 2>error &&
 	! grep -e "broken\.\.\.ref" error &&
 	! grep -e "broken\.\.\.ref" output
 '
 
-test_expect_failure C_LOCALE_OUTPUT 'push --mirror can delete badly named ref' '
+test_expect_failure 'push --mirror can delete badly named ref' '
 	top=$(pwd) &&
 	git init src &&
 	git init dest &&
@@ -135,7 +141,7 @@ test_expect_failure C_LOCALE_OUTPUT 'push --mirror can delete badly named ref' '
 		cd dest &&
 		test_commit two &&
 		git checkout --detach &&
-		cp .git/refs/heads/master .git/refs/heads/broken...ref
+		test-tool ref-store main update-ref msg "refs/heads/broken...ref" $main_sha1 $ZERO_OID REF_SKIP_REFNAME_VERIFICATION
 	) &&
 	git -C src push --mirror "file://$top/dest" &&
 	git -C dest branch >output 2>error &&
@@ -144,36 +150,36 @@ test_expect_failure C_LOCALE_OUTPUT 'push --mirror can delete badly named ref' '
 '
 
 test_expect_success 'rev-parse skips symref pointing to broken name' '
-	test_when_finished "rm -f .git/refs/heads/broken...ref" &&
+	test_when_finished "test-tool ref-store main delete-refs REF_NO_DEREF msg refs/heads/broken...ref" &&
 	git branch shadow one &&
-	cp .git/refs/heads/master .git/refs/heads/broken...ref &&
-	printf "ref: refs/heads/broken...ref\n" >.git/refs/tags/shadow &&
-	test_when_finished "rm -f .git/refs/tags/shadow" &&
+	test-tool ref-store main update-ref msg "refs/heads/broken...ref" $main_sha1 $ZERO_OID REF_SKIP_REFNAME_VERIFICATION &&
+	test-tool ref-store main create-symref refs/tags/shadow refs/heads/broken...ref msg &&
+	test_when_finished "test-tool ref-store main delete-refs REF_NO_DEREF msg refs/tags/shadow" &&
 	git rev-parse --verify one >expect &&
 	git rev-parse --verify shadow >actual 2>err &&
 	test_cmp expect actual &&
-	test_i18ngrep "ignoring dangling symref refs/tags/shadow" err
+	test_grep "ignoring dangling symref refs/tags/shadow" err
 '
 
 test_expect_success 'for-each-ref emits warnings for broken names' '
-	cp .git/refs/heads/master .git/refs/heads/broken...ref &&
-	test_when_finished "rm -f .git/refs/heads/broken...ref" &&
-	printf "ref: refs/heads/broken...ref\n" >.git/refs/heads/badname &&
-	test_when_finished "rm -f .git/refs/heads/badname" &&
-	printf "ref: refs/heads/master\n" >.git/refs/heads/broken...symref &&
-	test_when_finished "rm -f .git/refs/heads/broken...symref" &&
+	test-tool ref-store main update-ref msg "refs/heads/broken...ref" $main_sha1 $ZERO_OID REF_SKIP_REFNAME_VERIFICATION &&
+	test_when_finished "test-tool ref-store main delete-refs REF_NO_DEREF msg refs/heads/broken...ref" &&
+	test-tool ref-store main create-symref refs/heads/badname refs/heads/broken...ref &&
+	test_when_finished "test-tool ref-store main delete-refs REF_NO_DEREF msg refs/heads/badname" &&
+	test-tool ref-store main create-symref refs/heads/broken...symref refs/heads/main &&
+	test_when_finished "test-tool ref-store main delete-refs REF_NO_DEREF msg refs/heads/broken...symref" &&
 	git for-each-ref >output 2>error &&
 	! grep -e "broken\.\.\.ref" output &&
 	! grep -e "badname" output &&
 	! grep -e "broken\.\.\.symref" output &&
-	test_i18ngrep "ignoring ref with broken name refs/heads/broken\.\.\.ref" error &&
-	test_i18ngrep "ignoring broken ref refs/heads/badname" error &&
-	test_i18ngrep "ignoring ref with broken name refs/heads/broken\.\.\.symref" error
+	test_grep "ignoring ref with broken name refs/heads/broken\.\.\.ref" error &&
+	test_grep ! "ignoring broken ref refs/heads/badname" error &&
+	test_grep "ignoring ref with broken name refs/heads/broken\.\.\.symref" error
 '
 
 test_expect_success 'update-ref -d can delete broken name' '
-	cp .git/refs/heads/master .git/refs/heads/broken...ref &&
-	test_when_finished "rm -f .git/refs/heads/broken...ref" &&
+	test-tool ref-store main update-ref msg "refs/heads/broken...ref" $main_sha1 $ZERO_OID REF_SKIP_REFNAME_VERIFICATION &&
+	test_when_finished "test-tool ref-store main delete-refs REF_NO_DEREF msg refs/heads/broken...ref" &&
 	git update-ref -d refs/heads/broken...ref >output 2>error &&
 	test_must_be_empty output &&
 	test_must_be_empty error &&
@@ -183,10 +189,10 @@ test_expect_success 'update-ref -d can delete broken name' '
 '
 
 test_expect_success 'branch -d can delete broken name' '
-	cp .git/refs/heads/master .git/refs/heads/broken...ref &&
-	test_when_finished "rm -f .git/refs/heads/broken...ref" &&
+	test-tool ref-store main update-ref msg "refs/heads/broken...ref" $main_sha1 $ZERO_OID REF_SKIP_REFNAME_VERIFICATION &&
+	test_when_finished "test-tool ref-store main delete-refs REF_NO_DEREF msg refs/heads/broken...ref" &&
 	git branch -d broken...ref >output 2>error &&
-	test_i18ngrep "Deleted branch broken...ref (was broken)" output &&
+	test_grep "Deleted branch broken...ref (was broken)" output &&
 	test_must_be_empty error &&
 	git branch >output 2>error &&
 	! grep -e "broken\.\.\.ref" error &&
@@ -194,89 +200,99 @@ test_expect_success 'branch -d can delete broken name' '
 '
 
 test_expect_success 'update-ref --no-deref -d can delete symref to broken name' '
-	cp .git/refs/heads/master .git/refs/heads/broken...ref &&
-	test_when_finished "rm -f .git/refs/heads/broken...ref" &&
-	printf "ref: refs/heads/broken...ref\n" >.git/refs/heads/badname &&
-	test_when_finished "rm -f .git/refs/heads/badname" &&
+	test-tool ref-store main update-ref msg "refs/heads/broken...ref" $main_sha1 $ZERO_OID REF_SKIP_REFNAME_VERIFICATION &&
+
+	test_when_finished "test-tool ref-store main delete-refs REF_NO_DEREF msg refs/heads/broken...ref" &&
+	test-tool ref-store main create-symref refs/heads/badname refs/heads/broken...ref msg &&
+	test_when_finished "test-tool ref-store main delete-refs REF_NO_DEREF msg refs/heads/badname" &&
+	test_ref_exists refs/heads/badname &&
 	git update-ref --no-deref -d refs/heads/badname >output 2>error &&
-	test_path_is_missing .git/refs/heads/badname &&
+	test_ref_missing refs/heads/badname &&
 	test_must_be_empty output &&
 	test_must_be_empty error
 '
 
 test_expect_success 'branch -d can delete symref to broken name' '
-	cp .git/refs/heads/master .git/refs/heads/broken...ref &&
-	test_when_finished "rm -f .git/refs/heads/broken...ref" &&
-	printf "ref: refs/heads/broken...ref\n" >.git/refs/heads/badname &&
-	test_when_finished "rm -f .git/refs/heads/badname" &&
+	test-tool ref-store main update-ref msg "refs/heads/broken...ref" $main_sha1 $ZERO_OID REF_SKIP_REFNAME_VERIFICATION &&
+	test_when_finished "test-tool ref-store main delete-refs REF_NO_DEREF msg refs/heads/broken...ref" &&
+	test-tool ref-store main create-symref refs/heads/badname refs/heads/broken...ref msg &&
+	test_when_finished "test-tool ref-store main delete-refs REF_NO_DEREF msg refs/heads/badname" &&
+	test_ref_exists refs/heads/badname &&
 	git branch -d badname >output 2>error &&
-	test_path_is_missing .git/refs/heads/badname &&
-	test_i18ngrep "Deleted branch badname (was refs/heads/broken\.\.\.ref)" output &&
+	test_ref_missing refs/heads/badname &&
+	test_grep "Deleted branch badname (was refs/heads/broken\.\.\.ref)" output &&
 	test_must_be_empty error
 '
 
 test_expect_success 'update-ref --no-deref -d can delete dangling symref to broken name' '
-	printf "ref: refs/heads/broken...ref\n" >.git/refs/heads/badname &&
-	test_when_finished "rm -f .git/refs/heads/badname" &&
+	test-tool ref-store main create-symref refs/heads/badname refs/heads/broken...ref msg &&
+	test_when_finished "test-tool ref-store main delete-refs REF_NO_DEREF msg refs/heads/badname" &&
+	test_ref_exists refs/heads/badname &&
 	git update-ref --no-deref -d refs/heads/badname >output 2>error &&
-	test_path_is_missing .git/refs/heads/badname &&
+	test_ref_missing refs/heads/badname &&
 	test_must_be_empty output &&
 	test_must_be_empty error
 '
 
 test_expect_success 'branch -d can delete dangling symref to broken name' '
-	printf "ref: refs/heads/broken...ref\n" >.git/refs/heads/badname &&
-	test_when_finished "rm -f .git/refs/heads/badname" &&
+	test-tool ref-store main create-symref refs/heads/badname refs/heads/broken...ref msg &&
+	test_when_finished "test-tool ref-store main delete-refs REF_NO_DEREF msg refs/heads/badname" &&
+	test_ref_exists refs/heads/badname &&
 	git branch -d badname >output 2>error &&
-	test_path_is_missing .git/refs/heads/badname &&
-	test_i18ngrep "Deleted branch badname (was refs/heads/broken\.\.\.ref)" output &&
+	test_ref_missing refs/heads/badname &&
+	test_grep "Deleted branch badname (was refs/heads/broken\.\.\.ref)" output &&
 	test_must_be_empty error
 '
 
 test_expect_success 'update-ref -d can delete broken name through symref' '
-	cp .git/refs/heads/master .git/refs/heads/broken...ref &&
-	test_when_finished "rm -f .git/refs/heads/broken...ref" &&
-	printf "ref: refs/heads/broken...ref\n" >.git/refs/heads/badname &&
-	test_when_finished "rm -f .git/refs/heads/badname" &&
+	test-tool ref-store main update-ref msg "refs/heads/broken...ref" $main_sha1 $ZERO_OID REF_SKIP_REFNAME_VERIFICATION &&
+	test_when_finished "test-tool ref-store main delete-refs REF_NO_DEREF msg refs/heads/broken...ref" &&
+	test-tool ref-store main create-symref refs/heads/badname refs/heads/broken...ref msg &&
+	test_when_finished "test-tool ref-store main delete-refs REF_NO_DEREF msg refs/heads/badname" &&
+	test_ref_exists refs/heads/broken...ref &&
 	git update-ref -d refs/heads/badname >output 2>error &&
-	test_path_is_missing .git/refs/heads/broken...ref &&
+	test_ref_missing refs/heads/broken...ref &&
 	test_must_be_empty output &&
 	test_must_be_empty error
 '
 
 test_expect_success 'update-ref --no-deref -d can delete symref with broken name' '
-	printf "ref: refs/heads/master\n" >.git/refs/heads/broken...symref &&
-	test_when_finished "rm -f .git/refs/heads/broken...symref" &&
+	test-tool ref-store main create-symref refs/heads/broken...symref refs/heads/main &&
+	test_when_finished "test-tool ref-store main delete-refs REF_NO_DEREF msg refs/heads/broken...symref" &&
+	test_ref_exists refs/heads/broken...symref &&
 	git update-ref --no-deref -d refs/heads/broken...symref >output 2>error &&
-	test_path_is_missing .git/refs/heads/broken...symref &&
+	test_ref_missing refs/heads/broken...symref &&
 	test_must_be_empty output &&
 	test_must_be_empty error
 '
 
 test_expect_success 'branch -d can delete symref with broken name' '
-	printf "ref: refs/heads/master\n" >.git/refs/heads/broken...symref &&
-	test_when_finished "rm -f .git/refs/heads/broken...symref" &&
+	test-tool ref-store main create-symref refs/heads/broken...symref refs/heads/main &&
+	test_when_finished "test-tool ref-store main delete-refs REF_NO_DEREF msg refs/heads/broken...symref" &&
+	test_ref_exists refs/heads/broken...symref &&
 	git branch -d broken...symref >output 2>error &&
-	test_path_is_missing .git/refs/heads/broken...symref &&
-	test_i18ngrep "Deleted branch broken...symref (was refs/heads/master)" output &&
+	test_ref_missing refs/heads/broken...symref &&
+	test_grep "Deleted branch broken...symref (was refs/heads/main)" output &&
 	test_must_be_empty error
 '
 
 test_expect_success 'update-ref --no-deref -d can delete dangling symref with broken name' '
-	printf "ref: refs/heads/idonotexist\n" >.git/refs/heads/broken...symref &&
-	test_when_finished "rm -f .git/refs/heads/broken...symref" &&
+	test-tool ref-store main create-symref refs/heads/broken...symref refs/heads/idonotexist &&
+	test_when_finished "test-tool ref-store main delete-refs REF_NO_DEREF msg refs/heads/broken...symref" &&
+	test_ref_exists refs/heads/broken...symref &&
 	git update-ref --no-deref -d refs/heads/broken...symref >output 2>error &&
-	test_path_is_missing .git/refs/heads/broken...symref &&
+	test_ref_missing refs/heads/broken...symref &&
 	test_must_be_empty output &&
 	test_must_be_empty error
 '
 
 test_expect_success 'branch -d can delete dangling symref with broken name' '
-	printf "ref: refs/heads/idonotexist\n" >.git/refs/heads/broken...symref &&
-	test_when_finished "rm -f .git/refs/heads/broken...symref" &&
+	test-tool ref-store main create-symref refs/heads/broken...symref refs/heads/idonotexist &&
+	test_when_finished "test-tool ref-store main delete-refs REF_NO_DEREF msg refs/heads/broken...symref" &&
+	test_ref_exists refs/heads/broken...symref &&
 	git branch -d broken...symref >output 2>error &&
-	test_path_is_missing .git/refs/heads/broken...symref &&
-	test_i18ngrep "Deleted branch broken...symref (was refs/heads/idonotexist)" output &&
+	test_ref_missing refs/heads/broken...symref &&
+	test_grep "Deleted branch broken...symref (was refs/heads/idonotexist)" output &&
 	test_must_be_empty error
 '
 
@@ -285,7 +301,7 @@ test_expect_success 'update-ref -d cannot delete non-ref in .git dir' '
 	echo precious >expect &&
 	test_must_fail git update-ref -d my-private-file >output 2>error &&
 	test_must_be_empty output &&
-	test_i18ngrep -e "refusing to update ref with bad name" error &&
+	test_grep -e "refusing to update ref with bad name" error &&
 	test_cmp expect .git/my-private-file
 '
 
@@ -296,37 +312,37 @@ test_expect_success 'update-ref -d cannot delete absolute path' '
 '
 
 test_expect_success 'update-ref --stdin fails create with bad ref name' '
-	echo "create ~a refs/heads/master" >stdin &&
+	echo "create ~a refs/heads/main" >stdin &&
 	test_must_fail git update-ref --stdin <stdin 2>err &&
 	grep "fatal: invalid ref format: ~a" err
 '
 
 test_expect_success 'update-ref --stdin fails update with bad ref name' '
-	echo "update ~a refs/heads/master" >stdin &&
+	echo "update ~a refs/heads/main" >stdin &&
 	test_must_fail git update-ref --stdin <stdin 2>err &&
 	grep "fatal: invalid ref format: ~a" err
 '
 
 test_expect_success 'update-ref --stdin fails delete with bad ref name' '
-	echo "delete ~a refs/heads/master" >stdin &&
+	echo "delete ~a refs/heads/main" >stdin &&
 	test_must_fail git update-ref --stdin <stdin 2>err &&
 	grep "fatal: invalid ref format: ~a" err
 '
 
 test_expect_success 'update-ref --stdin -z fails create with bad ref name' '
-	printf "%s\0" "create ~a " refs/heads/master >stdin &&
+	printf "%s\0" "create ~a " refs/heads/main >stdin &&
 	test_must_fail git update-ref -z --stdin <stdin 2>err &&
 	grep "fatal: invalid ref format: ~a " err
 '
 
 test_expect_success 'update-ref --stdin -z fails update with bad ref name' '
-	printf "%s\0" "update ~a" refs/heads/master "" >stdin &&
+	printf "%s\0" "update ~a" refs/heads/main "" >stdin &&
 	test_must_fail git update-ref -z --stdin <stdin 2>err &&
 	grep "fatal: invalid ref format: ~a" err
 '
 
 test_expect_success 'update-ref --stdin -z fails delete with bad ref name' '
-	printf "%s\0" "delete ~a" refs/heads/master >stdin &&
+	printf "%s\0" "delete ~a" refs/heads/main >stdin &&
 	test_must_fail git update-ref -z --stdin <stdin 2>err &&
 	grep "fatal: invalid ref format: ~a" err
 '
diff --git a/t/t1450-fsck.sh b/t/t1450-fsck.sh
index b17f5c2..8a456b1 100755
--- a/t/t1450-fsck.sh
+++ b/t/t1450-fsck.sh
@@ -3,7 +3,7 @@
 test_description='git fsck random collection of tests
 
 * (HEAD) B
-* (master) A
+* (main) A
 '
 
 . ./test-lib.sh
@@ -15,6 +15,7 @@ test_expect_success setup '
 	git config --unset i18n.commitencoding &&
 	git checkout HEAD^0 &&
 	test_commit B fileB two &&
+	orig_head=$(git rev-parse HEAD) &&
 	git tag -d A B &&
 	git reflog expire --expire=now --all
 '
@@ -40,96 +41,137 @@ test_expect_success 'HEAD is part of refs, valid objects appear valid' '
 # specific corruption you test afterwards, lest a later test trip over
 # it.
 
-test_expect_success 'setup: helpers for corruption tests' '
-	sha1_file() {
-		remainder=${1#??} &&
-		firsttwo=${1%$remainder} &&
-		echo ".git/objects/$firsttwo/$remainder"
-	} &&
+sha1_file () {
+	git rev-parse --git-path objects/$(test_oid_to_path "$1")
+}
+
+remove_object () {
+	rm "$(sha1_file "$1")"
+}
+
+test_expect_success 'object with hash mismatch' '
+	git init --bare hash-mismatch &&
+	(
+		cd hash-mismatch &&
+
+		oid=$(echo blob | git hash-object -w --stdin) &&
+		oldoid=$oid &&
+		old=$(test_oid_to_path "$oid") &&
+		new=$(dirname $old)/$(test_oid ff_2) &&
+		oid="$(dirname $new)$(basename $new)" &&
 
-	remove_object() {
-		rm "$(sha1_file "$1")"
-	}
+		mv objects/$old objects/$new &&
+		git update-index --add --cacheinfo 100644 $oid foo &&
+		tree=$(git write-tree) &&
+		cmt=$(echo bogus | git commit-tree $tree) &&
+		git update-ref refs/heads/bogus $cmt &&
+
+		test_must_fail git fsck 2>out &&
+		grep "$oldoid: hash-path mismatch, found at: .*$new" out
+	)
 '
 
-test_expect_success 'object with bad sha1' '
-	sha=$(echo blob | git hash-object -w --stdin) &&
-	old=$(test_oid_to_path "$sha") &&
-	new=$(dirname $old)/$(test_oid ff_2) &&
-	sha="$(dirname $new)$(basename $new)" &&
-	mv .git/objects/$old .git/objects/$new &&
-	test_when_finished "remove_object $sha" &&
-	git update-index --add --cacheinfo 100644 $sha foo &&
-	test_when_finished "git read-tree -u --reset HEAD" &&
-	tree=$(git write-tree) &&
-	test_when_finished "remove_object $tree" &&
-	cmt=$(echo bogus | git commit-tree $tree) &&
-	test_when_finished "remove_object $cmt" &&
-	git update-ref refs/heads/bogus $cmt &&
-	test_when_finished "git update-ref -d refs/heads/bogus" &&
+test_expect_success 'object with hash and type mismatch' '
+	git init --bare hash-type-mismatch &&
+	(
+		cd hash-type-mismatch &&
 
-	test_must_fail git fsck 2>out &&
-	test_i18ngrep "$sha.*corrupt" out
+		oid=$(echo blob | git hash-object -w --stdin -t garbage --literally) &&
+		oldoid=$oid &&
+		old=$(test_oid_to_path "$oid") &&
+		new=$(dirname $old)/$(test_oid ff_2) &&
+		oid="$(dirname $new)$(basename $new)" &&
+
+		mv objects/$old objects/$new &&
+		git update-index --add --cacheinfo 100644 $oid foo &&
+		tree=$(git write-tree) &&
+		cmt=$(echo bogus | git commit-tree $tree) &&
+		git update-ref refs/heads/bogus $cmt &&
+
+
+		test_must_fail git fsck 2>out &&
+		grep "^error: $oldoid: hash-path mismatch, found at: .*$new" out &&
+		grep "^error: $oldoid: object is of unknown type '"'"'garbage'"'"'" out
+	)
+'
+
+test_expect_success 'zlib corrupt loose object output ' '
+	git init --bare corrupt-loose-output &&
+	(
+		cd corrupt-loose-output &&
+		oid=$(git hash-object -w --stdin --literally </dev/null) &&
+		oidf=objects/$(test_oid_to_path "$oid") &&
+		chmod +w $oidf &&
+		echo extra garbage >>$oidf &&
+
+		cat >expect.error <<-EOF &&
+		error: garbage at end of loose object '\''$oid'\''
+		error: unable to unpack contents of ./$oidf
+		error: $oid: object corrupt or missing: ./$oidf
+		EOF
+		test_must_fail git fsck 2>actual &&
+		grep ^error: actual >error &&
+		test_cmp expect.error error
+	)
 '
 
 test_expect_success 'branch pointing to non-commit' '
-	git rev-parse HEAD^{tree} >.git/refs/heads/invalid &&
+	tree_oid=$(git rev-parse --verify HEAD^{tree}) &&
 	test_when_finished "git update-ref -d refs/heads/invalid" &&
+	test-tool ref-store main update-ref msg refs/heads/invalid $tree_oid $ZERO_OID REF_SKIP_OID_VERIFICATION &&
 	test_must_fail git fsck 2>out &&
-	test_i18ngrep "not a commit" out
+	test_grep "not a commit" out
 '
 
-test_expect_success 'HEAD link pointing at a funny object' '
-	test_when_finished "mv .git/SAVED_HEAD .git/HEAD" &&
-	mv .git/HEAD .git/SAVED_HEAD &&
+test_expect_success REFFILES 'HEAD link pointing at a funny object' '
+	test_when_finished "git update-ref HEAD $orig_head" &&
 	echo $ZERO_OID >.git/HEAD &&
 	# avoid corrupt/broken HEAD from interfering with repo discovery
 	test_must_fail env GIT_DIR=.git git fsck 2>out &&
-	test_i18ngrep "detached HEAD points" out
+	test_grep "detached HEAD points" out
 '
 
 test_expect_success 'HEAD link pointing at a funny place' '
-	test_when_finished "mv .git/SAVED_HEAD .git/HEAD" &&
-	mv .git/HEAD .git/SAVED_HEAD &&
-	echo "ref: refs/funny/place" >.git/HEAD &&
+	test_when_finished "git update-ref --no-deref HEAD $orig_head" &&
+	test-tool ref-store main create-symref HEAD refs/funny/place &&
 	# avoid corrupt/broken HEAD from interfering with repo discovery
 	test_must_fail env GIT_DIR=.git git fsck 2>out &&
-	test_i18ngrep "HEAD points to something strange" out
+	test_grep "HEAD points to something strange" out
 '
 
-test_expect_success 'HEAD link pointing at a funny object (from different wt)' '
-	test_when_finished "mv .git/SAVED_HEAD .git/HEAD" &&
-	test_when_finished "rm -rf .git/worktrees wt" &&
+test_expect_success REFFILES 'HEAD link pointing at a funny object (from different wt)' '
+	test_when_finished "git update-ref HEAD $orig_head" &&
+	test_when_finished "git worktree remove -f wt" &&
 	git worktree add wt &&
-	mv .git/HEAD .git/SAVED_HEAD &&
 	echo $ZERO_OID >.git/HEAD &&
 	# avoid corrupt/broken HEAD from interfering with repo discovery
 	test_must_fail git -C wt fsck 2>out &&
-	test_i18ngrep "main-worktree/HEAD: detached HEAD points" out
+	test_grep "main-worktree/HEAD: detached HEAD points" out
 '
 
-test_expect_success 'other worktree HEAD link pointing at a funny object' '
-	test_when_finished "rm -rf .git/worktrees other" &&
+test_expect_success REFFILES 'other worktree HEAD link pointing at a funny object' '
+	test_when_finished "git worktree remove -f other" &&
 	git worktree add other &&
 	echo $ZERO_OID >.git/worktrees/other/HEAD &&
 	test_must_fail git fsck 2>out &&
-	test_i18ngrep "worktrees/other/HEAD: detached HEAD points" out
+	test_grep "worktrees/other/HEAD: detached HEAD points" out
 '
 
 test_expect_success 'other worktree HEAD link pointing at missing object' '
-	test_when_finished "rm -rf .git/worktrees other" &&
+	test_when_finished "git worktree remove -f other" &&
 	git worktree add other &&
-	echo "Contents missing from repo" | git hash-object --stdin >.git/worktrees/other/HEAD &&
+	object_id=$(echo "Contents missing from repo" | git hash-object --stdin) &&
+	test-tool -C other ref-store main update-ref msg HEAD $object_id "" REF_NO_DEREF,REF_SKIP_OID_VERIFICATION &&
 	test_must_fail git fsck 2>out &&
-	test_i18ngrep "worktrees/other/HEAD: invalid sha1 pointer" out
+	test_grep "worktrees/other/HEAD: invalid sha1 pointer" out
 '
 
 test_expect_success 'other worktree HEAD link pointing at a funny place' '
-	test_when_finished "rm -rf .git/worktrees other" &&
+	test_when_finished "git worktree remove -f other" &&
 	git worktree add other &&
-	echo "ref: refs/funny/place" >.git/worktrees/other/HEAD &&
+	git -C other symbolic-ref HEAD refs/funny/place &&
 	test_must_fail git fsck 2>out &&
-	test_i18ngrep "worktrees/other/HEAD points to something strange" out
+	test_grep "worktrees/other/HEAD points to something strange" out
 '
 
 test_expect_success 'commit with multiple signatures is okay' '
@@ -170,45 +212,45 @@ test_expect_success 'email without @ is okay' '
 test_expect_success 'email with embedded > is not okay' '
 	git cat-file commit HEAD >basis &&
 	sed "s/@[a-z]/&>/" basis >bad-email &&
-	new=$(git hash-object -t commit -w --stdin <bad-email) &&
+	new=$(git hash-object --literally -t commit -w --stdin <bad-email) &&
 	test_when_finished "remove_object $new" &&
 	git update-ref refs/heads/bogus "$new" &&
 	test_when_finished "git update-ref -d refs/heads/bogus" &&
 	test_must_fail git fsck 2>out &&
-	test_i18ngrep "error in commit $new" out
+	test_grep "error in commit $new" out
 '
 
 test_expect_success 'missing < email delimiter is reported nicely' '
 	git cat-file commit HEAD >basis &&
 	sed "s/<//" basis >bad-email-2 &&
-	new=$(git hash-object -t commit -w --stdin <bad-email-2) &&
+	new=$(git hash-object --literally -t commit -w --stdin <bad-email-2) &&
 	test_when_finished "remove_object $new" &&
 	git update-ref refs/heads/bogus "$new" &&
 	test_when_finished "git update-ref -d refs/heads/bogus" &&
 	test_must_fail git fsck 2>out &&
-	test_i18ngrep "error in commit $new.* - bad name" out
+	test_grep "error in commit $new.* - bad name" out
 '
 
 test_expect_success 'missing email is reported nicely' '
 	git cat-file commit HEAD >basis &&
 	sed "s/[a-z]* <[^>]*>//" basis >bad-email-3 &&
-	new=$(git hash-object -t commit -w --stdin <bad-email-3) &&
+	new=$(git hash-object --literally -t commit -w --stdin <bad-email-3) &&
 	test_when_finished "remove_object $new" &&
 	git update-ref refs/heads/bogus "$new" &&
 	test_when_finished "git update-ref -d refs/heads/bogus" &&
 	test_must_fail git fsck 2>out &&
-	test_i18ngrep "error in commit $new.* - missing email" out
+	test_grep "error in commit $new.* - missing email" out
 '
 
 test_expect_success '> in name is reported' '
 	git cat-file commit HEAD >basis &&
 	sed "s/ </> </" basis >bad-email-4 &&
-	new=$(git hash-object -t commit -w --stdin <bad-email-4) &&
+	new=$(git hash-object --literally -t commit -w --stdin <bad-email-4) &&
 	test_when_finished "remove_object $new" &&
 	git update-ref refs/heads/bogus "$new" &&
 	test_when_finished "git update-ref -d refs/heads/bogus" &&
 	test_must_fail git fsck 2>out &&
-	test_i18ngrep "error in commit $new" out
+	test_grep "error in commit $new" out
 '
 
 # date is 2^64 + 1
@@ -216,23 +258,23 @@ test_expect_success 'integer overflow in timestamps is reported' '
 	git cat-file commit HEAD >basis &&
 	sed "s/^\\(author .*>\\) [0-9]*/\\1 18446744073709551617/" \
 		<basis >bad-timestamp &&
-	new=$(git hash-object -t commit -w --stdin <bad-timestamp) &&
+	new=$(git hash-object --literally -t commit -w --stdin <bad-timestamp) &&
 	test_when_finished "remove_object $new" &&
 	git update-ref refs/heads/bogus "$new" &&
 	test_when_finished "git update-ref -d refs/heads/bogus" &&
 	test_must_fail git fsck 2>out &&
-	test_i18ngrep "error in commit $new.*integer overflow" out
+	test_grep "error in commit $new.*integer overflow" out
 '
 
 test_expect_success 'commit with NUL in header' '
 	git cat-file commit HEAD >basis &&
 	sed "s/author ./author Q/" <basis | q_to_nul >commit-NUL-header &&
-	new=$(git hash-object -t commit -w --stdin <commit-NUL-header) &&
+	new=$(git hash-object --literally -t commit -w --stdin <commit-NUL-header) &&
 	test_when_finished "remove_object $new" &&
 	git update-ref refs/heads/bogus "$new" &&
 	test_when_finished "git update-ref -d refs/heads/bogus" &&
 	test_must_fail git fsck 2>out &&
-	test_i18ngrep "error in commit $new.*unterminated header: NUL at offset" out
+	test_grep "error in commit $new.*unterminated header: NUL at offset" out
 '
 
 test_expect_success 'tree object with duplicate entries' '
@@ -250,10 +292,10 @@ test_expect_success 'tree object with duplicate entries' '
 			git cat-file tree $T &&
 			git cat-file tree $T
 		) |
-		git hash-object -w -t tree --stdin
+		git hash-object --literally -w -t tree --stdin
 	) &&
 	test_must_fail git fsck 2>out &&
-	test_i18ngrep "error in tree .*contains duplicate file entries" out
+	test_grep "error in tree .*contains duplicate file entries" out
 '
 
 check_duplicate_names () {
@@ -276,8 +318,8 @@ check_duplicate_names () {
 		done >badtree &&
 		badtree=$(git mktree <badtree) &&
 		test_must_fail git fsck 2>out &&
-		test_i18ngrep "$badtree" out &&
-		test_i18ngrep "error in tree .*contains duplicate file entries" out
+		test_grep "$badtree" out &&
+		test_grep "error in tree .*contains duplicate file entries" out
 	'
 }
 
@@ -299,9 +341,9 @@ test_expect_success 'unparseable tree object' '
 	commit_sha1=$(git commit-tree $tree_sha1) &&
 	git update-ref refs/heads/wrong $commit_sha1 &&
 	test_must_fail git fsck 2>out &&
-	test_i18ngrep "error: empty filename in tree entry" out &&
-	test_i18ngrep "$tree_sha1" out &&
-	test_i18ngrep ! "fatal: empty filename in tree entry" out
+	test_grep "error: empty filename in tree entry" out &&
+	test_grep "$tree_sha1" out &&
+	test_grep ! "fatal: empty filename in tree entry" out
 '
 
 test_expect_success 'tree entry with type mismatch' '
@@ -318,8 +360,22 @@ test_expect_success 'tree entry with type mismatch' '
 	commit=$(git commit-tree $tree) &&
 	git update-ref refs/heads/type_mismatch $commit &&
 	test_must_fail git fsck >out 2>&1 &&
-	test_i18ngrep "is a blob, not a tree" out &&
-	test_i18ngrep ! "dangling blob" out
+	test_grep "is a blob, not a tree" out &&
+	test_grep ! "dangling blob" out
+'
+
+test_expect_success 'tree entry with bogus mode' '
+	test_when_finished "remove_object \$blob" &&
+	test_when_finished "remove_object \$tree" &&
+	blob=$(echo blob | git hash-object -w --stdin) &&
+	blob_oct=$(echo $blob | hex2oct) &&
+	tree=$(printf "100000 foo\0${blob_oct}" |
+	       git hash-object -t tree --stdin -w --literally) &&
+	git fsck 2>err &&
+	cat >expect <<-EOF &&
+	warning in tree $tree: badFilemode: contains bad file modes
+	EOF
+	test_cmp expect err
 '
 
 test_expect_success 'tag pointing to nonexistent' '
@@ -335,10 +391,10 @@ test_expect_success 'tag pointing to nonexistent' '
 
 	tag=$(git hash-object -t tag -w --stdin <invalid-tag) &&
 	test_when_finished "remove_object $tag" &&
-	echo $tag >.git/refs/tags/invalid &&
+	git update-ref refs/tags/invalid $tag &&
 	test_when_finished "git update-ref -d refs/tags/invalid" &&
 	test_must_fail git fsck --tags >out &&
-	test_i18ngrep "broken link" out
+	test_grep "broken link" out
 '
 
 test_expect_success 'tag pointing to something else than its type' '
@@ -355,7 +411,7 @@ test_expect_success 'tag pointing to something else than its type' '
 
 	tag=$(git hash-object -t tag -w --stdin <wrong-tag) &&
 	test_when_finished "remove_object $tag" &&
-	echo $tag >.git/refs/tags/wrong &&
+	git update-ref refs/tags/wrong $tag &&
 	test_when_finished "git update-ref -d refs/tags/wrong" &&
 	test_must_fail git fsck --tags
 '
@@ -370,9 +426,9 @@ test_expect_success 'tag with incorrect tag name & missing tagger' '
 	This is an invalid tag.
 	EOF
 
-	tag=$(git hash-object -t tag -w --stdin <wrong-tag) &&
+	tag=$(git hash-object --literally -t tag -w --stdin <wrong-tag) &&
 	test_when_finished "remove_object $tag" &&
-	echo $tag >.git/refs/tags/wrong &&
+	git update-ref refs/tags/wrong $tag &&
 	test_when_finished "git update-ref -d refs/tags/wrong" &&
 	git fsck --tags 2>out &&
 
@@ -380,7 +436,7 @@ test_expect_success 'tag with incorrect tag name & missing tagger' '
 	warning in tag $tag: badTagName: invalid '\''tag'\'' name: wrong name format
 	warning in tag $tag: missingTaggerEntry: invalid format - expected '\''tagger'\'' line
 	EOF
-	test_i18ncmp expect out
+	test_cmp expect out
 '
 
 test_expect_success 'tag with bad tagger' '
@@ -396,10 +452,10 @@ test_expect_success 'tag with bad tagger' '
 
 	tag=$(git hash-object --literally -t tag -w --stdin <wrong-tag) &&
 	test_when_finished "remove_object $tag" &&
-	echo $tag >.git/refs/tags/wrong &&
+	git update-ref refs/tags/wrong $tag &&
 	test_when_finished "git update-ref -d refs/tags/wrong" &&
 	test_must_fail git fsck --tags 2>out &&
-	test_i18ngrep "error in tag .*: invalid author/committer" out
+	test_grep "error in tag .*: invalid author/committer" out
 '
 
 test_expect_success 'tag with NUL in header' '
@@ -415,10 +471,10 @@ test_expect_success 'tag with NUL in header' '
 
 	tag=$(git hash-object --literally -t tag -w --stdin <tag-NUL-header) &&
 	test_when_finished "remove_object $tag" &&
-	echo $tag >.git/refs/tags/wrong &&
+	git update-ref refs/tags/wrong $tag &&
 	test_when_finished "git update-ref -d refs/tags/wrong" &&
 	test_must_fail git fsck --tags 2>out &&
-	test_i18ngrep "error in tag $tag.*unterminated header: NUL at offset" out
+	test_grep "error in tag $tag.*unterminated header: NUL at offset" out
 '
 
 test_expect_success 'cleaned up' '
@@ -448,13 +504,61 @@ test_expect_success 'rev-list --verify-objects with bad sha1' '
 	test_when_finished "git update-ref -d refs/heads/bogus" &&
 
 	test_might_fail git rev-list --verify-objects refs/heads/bogus >/dev/null 2>out &&
-	test_i18ngrep -q "error: hash mismatch $(dirname $new)$(test_oid ff_2)" out
+	test_grep -q "error: hash mismatch $(dirname $new)$(test_oid ff_2)" out
+'
+
+# An actual bit corruption is more likely than swapped commits, but
+# this provides an easy way to have commits which don't match their purported
+# hashes, but which aren't so broken we can't read them at all.
+test_expect_success 'rev-list --verify-objects notices swapped commits' '
+	git init swapped-commits &&
+	(
+		cd swapped-commits &&
+		test_commit one &&
+		test_commit two &&
+		one_oid=$(git rev-parse HEAD) &&
+		two_oid=$(git rev-parse HEAD^) &&
+		one=.git/objects/$(test_oid_to_path $one_oid) &&
+		two=.git/objects/$(test_oid_to_path $two_oid) &&
+		mv $one tmp &&
+		mv $two $one &&
+		mv tmp $two &&
+		test_must_fail git rev-list --verify-objects HEAD
+	)
+'
+
+test_expect_success 'set up repository with commit-graph' '
+	git init corrupt-graph &&
+	(
+		cd corrupt-graph &&
+		test_commit one &&
+		test_commit two &&
+		git commit-graph write --reachable
+	)
+'
+
+corrupt_graph_obj () {
+	oid=$(git -C corrupt-graph rev-parse "$1") &&
+	obj=corrupt-graph/.git/objects/$(test_oid_to_path $oid) &&
+	test_when_finished 'mv backup $obj' &&
+	mv $obj backup &&
+	echo garbage >$obj
+}
+
+test_expect_success 'rev-list --verify-objects with commit graph (tip)' '
+	corrupt_graph_obj HEAD &&
+	test_must_fail git -C corrupt-graph rev-list --verify-objects HEAD
+'
+
+test_expect_success 'rev-list --verify-objects with commit graph (parent)' '
+	corrupt_graph_obj HEAD^ &&
+	test_must_fail git -C corrupt-graph rev-list --verify-objects HEAD
 '
 
 test_expect_success 'force fsck to ignore double author' '
 	git cat-file commit HEAD >basis &&
 	sed "s/^author .*/&,&/" <basis | tr , \\n >multiple-authors &&
-	new=$(git hash-object -t commit -w --stdin <multiple-authors) &&
+	new=$(git hash-object --literally -t commit -w --stdin <multiple-authors) &&
 	test_when_finished "remove_object $new" &&
 	git update-ref refs/heads/bogus "$new" &&
 	test_when_finished "git update-ref -d refs/heads/bogus" &&
@@ -469,9 +573,9 @@ test_expect_success 'fsck notices blob entry pointing to null sha1' '
 	(git init null-blob &&
 	 cd null-blob &&
 	 sha=$(printf "100644 file$_bz$_bzoid" |
-	       git hash-object -w --stdin -t tree) &&
+	       git hash-object --literally -w --stdin -t tree) &&
 	  git fsck 2>out &&
-	  test_i18ngrep "warning.*null sha1" out
+	  test_grep "warning.*null sha1" out
 	)
 '
 
@@ -479,9 +583,19 @@ test_expect_success 'fsck notices submodule entry pointing to null sha1' '
 	(git init null-commit &&
 	 cd null-commit &&
 	 sha=$(printf "160000 submodule$_bz$_bzoid" |
-	       git hash-object -w --stdin -t tree) &&
+	       git hash-object --literally -w --stdin -t tree) &&
 	  git fsck 2>out &&
-	  test_i18ngrep "warning.*null sha1" out
+	  test_grep "warning.*null sha1" out
+	)
+'
+
+test_expect_success 'fsck notices excessively large tree entry name' '
+	git init large-name &&
+	(
+		cd large-name &&
+		test_commit a-long-name &&
+		git -c fsck.largePathname=warn:10 fsck 2>out &&
+		grep "warning.*large pathname" out
 	)
 '
 
@@ -502,7 +616,7 @@ while read name path pretty; do
 			printf "$mode $type %s\t%s" "$value" "$path" >bad &&
 			bad_tree=$(git mktree <bad) &&
 			git fsck 2>out &&
-			test_i18ngrep "warning.*tree $bad_tree" out
+			test_grep "warning.*tree $bad_tree" out
 		)'
 	done <<-\EOF
 	100644 blob
@@ -544,13 +658,13 @@ test_expect_success 'NUL in commit' '
 		git commit --allow-empty -m "initial commitQNUL after message" &&
 		git cat-file commit HEAD >original &&
 		q_to_nul <original >munged &&
-		git hash-object -w -t commit --stdin <munged >name &&
+		git hash-object --literally -w -t commit --stdin <munged >name &&
 		git branch bad $(cat name) &&
 
 		test_must_fail git -c fsck.nulInCommit=error fsck 2>warn.1 &&
-		test_i18ngrep nulInCommit warn.1 &&
+		test_grep nulInCommit warn.1 &&
 		git fsck 2>warn.2 &&
-		test_i18ngrep nulInCommit warn.2
+		test_grep nulInCommit warn.2
 	)
 '
 
@@ -662,13 +776,15 @@ test_expect_success 'fsck --name-objects' '
 	git init name-objects &&
 	(
 		cd name-objects &&
+		git config core.logAllRefUpdates false &&
 		test_commit julius caesar.t &&
-		test_commit augustus &&
-		test_commit caesar &&
+		test_commit augustus44 &&
+		test_commit caesar  &&
 		remove_object $(git rev-parse julius:caesar.t) &&
-		test_must_fail git fsck --name-objects >out &&
 		tree=$(git rev-parse --verify julius:) &&
-		test_i18ngrep "$tree (refs/tags/julius:" out
+		git tag -d julius &&
+		test_must_fail git fsck --name-objects >out &&
+		test_grep "$tree (refs/tags/augustus44\\^:" out
 	)
 '
 
@@ -681,15 +797,15 @@ test_expect_success 'alternate objects are correctly blamed' '
 	mkdir alt.git/objects/$(dirname $path) &&
 	>alt.git/objects/$(dirname $path)/$(basename $path) &&
 	test_must_fail git fsck >out 2>&1 &&
-	test_i18ngrep alt.git out
+	test_grep alt.git out
 '
 
 test_expect_success 'fsck errors in packed objects' '
 	git cat-file commit HEAD >basis &&
 	sed "s/</one/" basis >one &&
 	sed "s/</foo/" basis >two &&
-	one=$(git hash-object -t commit -w one) &&
-	two=$(git hash-object -t commit -w two) &&
+	one=$(git hash-object --literally -t commit -w one) &&
+	two=$(git hash-object --literally -t commit -w two) &&
 	pack=$(
 		{
 			echo $one &&
@@ -700,8 +816,8 @@ test_expect_success 'fsck errors in packed objects' '
 	remove_object $one &&
 	remove_object $two &&
 	test_must_fail git fsck 2>out &&
-	test_i18ngrep "error in commit $one.* - bad name" out &&
-	test_i18ngrep "error in commit $two.* - bad name" out &&
+	test_grep "error in commit $one.* - bad name" out &&
+	test_grep "error in commit $two.* - bad name" out &&
 	! grep corrupt out
 '
 
@@ -718,7 +834,7 @@ test_expect_success 'fsck fails on corrupt packfile' '
 	test_when_finished "rm -f .git/objects/pack/pack-$pack.*" &&
 	remove_object $hsh &&
 	test_must_fail git fsck 2>out &&
-	test_i18ngrep "checksum mismatch" out
+	test_grep "checksum mismatch" out
 '
 
 test_expect_success 'fsck finds problems in duplicate loose objects' '
@@ -730,10 +846,19 @@ test_expect_success 'fsck finds problems in duplicate loose objects' '
 		# no "-d" here, so we end up with duplicates
 		git repack &&
 		# now corrupt the loose copy
-		file=$(sha1_file "$(git rev-parse HEAD)") &&
+		oid="$(git rev-parse HEAD)" &&
+		file=$(sha1_file "$oid") &&
 		rm "$file" &&
 		echo broken >"$file" &&
-		test_must_fail git fsck
+		test_must_fail git fsck 2>err &&
+
+		cat >expect <<-EOF &&
+		error: inflate: data stream error (incorrect header check)
+		error: unable to unpack header of $file
+		error: $oid: object corrupt or missing: $file
+		EOF
+		grep "^error: " err >actual &&
+		test_cmp expect actual
 	)
 '
 
@@ -746,7 +871,7 @@ test_expect_success 'fsck detects trailing loose garbage (commit)' '
 	chmod +w "$file" &&
 	echo garbage >>"$file" &&
 	test_must_fail git fsck 2>out &&
-	test_i18ngrep "garbage.*$commit" out
+	test_grep "garbage.*$commit" out
 '
 
 test_expect_success 'fsck detects trailing loose garbage (large blob)' '
@@ -756,7 +881,7 @@ test_expect_success 'fsck detects trailing loose garbage (large blob)' '
 	chmod +w "$file" &&
 	echo garbage >>"$file" &&
 	test_must_fail git -c core.bigfilethreshold=5 fsck 2>out &&
-	test_i18ngrep "garbage.*$blob" out
+	test_grep "garbage.*$blob" out
 '
 
 test_expect_success 'fsck detects truncated loose object' '
@@ -772,10 +897,10 @@ test_expect_success 'fsck detects truncated loose object' '
 
 	# check both regular and streaming code paths
 	test_must_fail git fsck 2>out &&
-	test_i18ngrep corrupt.*$blob out &&
+	test_grep corrupt.*$blob out &&
 
 	test_must_fail git -c core.bigfilethreshold=128 fsck 2>out &&
-	test_i18ngrep corrupt.*$blob out
+	test_grep corrupt.*$blob out
 '
 
 # for each of type, we have one version which is referenced by another object
@@ -806,7 +931,7 @@ test_expect_success 'fsck notices dangling objects' '
 		git fsck >actual &&
 		# the output order is non-deterministic, as it comes from a hash
 		sort <actual >actual.sorted &&
-		test_i18ncmp expect actual.sorted
+		test_cmp expect actual.sorted
 	)
 '
 
@@ -816,7 +941,7 @@ test_expect_success 'fsck --connectivity-only notices dangling objects' '
 		git fsck --connectivity-only >actual &&
 		# the output order is non-deterministic, as it comes from a hash
 		sort <actual >actual.sorted &&
-		test_i18ncmp expect actual.sorted
+		test_cmp expect actual.sorted
 	)
 '
 
@@ -864,7 +989,75 @@ test_expect_success 'detect corrupt index file in fsck' '
 	test_when_finished "mv .git/index.backup .git/index" &&
 	corrupt_index_checksum &&
 	test_must_fail git fsck --cache 2>errors &&
-	test_i18ngrep "bad index file" errors
+	test_grep "bad index file" errors
+'
+
+test_expect_success 'fsck error and recovery on invalid object type' '
+	git init --bare garbage-type &&
+	(
+		cd garbage-type &&
+
+		garbage_blob=$(git hash-object --stdin -w -t garbage --literally </dev/null) &&
+
+		test_must_fail git fsck 2>err &&
+		grep -e "^error" -e "^fatal" err >errors &&
+		test_line_count = 1 errors &&
+		grep "$garbage_blob: object is of unknown type '"'"'garbage'"'"':" err
+	)
+'
+
+test_expect_success 'fsck error on gitattributes with excessive line lengths' '
+	blob=$(printf "pattern %02048d" 1 | git hash-object -w --stdin) &&
+	test_when_finished "remove_object $blob" &&
+	tree=$(printf "100644 blob %s\t%s\n" $blob .gitattributes | git mktree) &&
+	test_when_finished "remove_object $tree" &&
+	cat >expected <<-EOF &&
+	error in blob $blob: gitattributesLineLength: .gitattributes has too long lines to parse
+	EOF
+	test_must_fail git fsck --no-dangling >actual 2>&1 &&
+	test_cmp expected actual
+'
+
+test_expect_success 'fsck error on gitattributes with excessive size' '
+	blob=$(test-tool genzeros $((100 * 1024 * 1024 + 1)) | git hash-object -w --stdin) &&
+	test_when_finished "remove_object $blob" &&
+	tree=$(printf "100644 blob %s\t%s\n" $blob .gitattributes | git mktree) &&
+	test_when_finished "remove_object $tree" &&
+	cat >expected <<-EOF &&
+	error in blob $blob: gitattributesLarge: .gitattributes too large to parse
+	EOF
+	test_must_fail git fsck --no-dangling >actual 2>&1 &&
+	test_cmp expected actual
+'
+
+test_expect_success 'fsck detects problems in worktree index' '
+	test_when_finished "git worktree remove -f wt" &&
+	git worktree add wt &&
+
+	echo "this will be removed to break the worktree index" >wt/file &&
+	git -C wt add file &&
+	blob=$(git -C wt rev-parse :file) &&
+	remove_object $blob &&
+
+	test_must_fail git fsck --name-objects >actual 2>&1 &&
+	cat >expect <<-EOF &&
+	missing blob $blob (.git/worktrees/wt/index:file)
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'fsck reports problems in current worktree index without filename' '
+	test_when_finished "rm -f .git/index && git read-tree HEAD" &&
+	echo "this object will be removed to break current worktree index" >file &&
+	git add file &&
+	blob=$(git rev-parse :file) &&
+	remove_object $blob &&
+
+	test_must_fail git fsck --name-objects >actual 2>&1 &&
+	cat >expect <<-EOF &&
+	missing blob $blob (:file)
+	EOF
+	test_cmp expect actual
 '
 
 test_done
diff --git a/t/t1451-fsck-buffer.sh b/t/t1451-fsck-buffer.sh
new file mode 100755
index 0000000..3413da4
--- /dev/null
+++ b/t/t1451-fsck-buffer.sh
@@ -0,0 +1,142 @@
+#!/bin/sh
+
+test_description='fsck on buffers without NUL termination
+
+The goal here is to make sure that the various fsck parsers never look
+past the end of the buffer they are given, even when encountering broken
+or truncated objects.
+
+We have to use "hash-object" for this because most code paths that read objects
+append an extra NUL for safety after the buffer. But hash-object, since it is
+reading straight from a file (and possibly even mmap-ing it) cannot always do
+so.
+
+These tests _might_ catch such overruns in normal use, but should be run with
+ASan or valgrind for more confidence.
+'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+# the general idea for tags and commits is to build up the "base" file
+# progressively, and then test new truncations on top of it.
+reset () {
+	test_expect_success 'reset input to empty' '
+		>base
+	'
+}
+
+add () {
+	content="$1"
+	type=${content%% *}
+	test_expect_success "add $type line" '
+		echo "$content" >>base
+	'
+}
+
+check () {
+	type=$1
+	fsck=$2
+	content=$3
+	test_expect_success "truncated $type ($fsck, \"$content\")" '
+		# do not pipe into hash-object here; we want to increase
+		# the chance that it uses a fixed-size buffer or mmap,
+		# and a pipe would be read into a strbuf.
+		{
+			cat base &&
+			echo "$content"
+		} >input &&
+		test_must_fail git hash-object -t "$type" input 2>err &&
+		grep "$fsck" err
+	'
+}
+
+test_expect_success 'create valid objects' '
+	git commit --allow-empty -m foo &&
+	commit=$(git rev-parse --verify HEAD) &&
+	tree=$(git rev-parse --verify HEAD^{tree})
+'
+
+reset
+check commit missingTree ""
+check commit missingTree "tr"
+check commit missingTree "tree"
+check commit badTreeSha1 "tree "
+check commit badTreeSha1 "tree 1234"
+add "tree $tree"
+
+# these expect missingAuthor because "parent" is optional
+check commit missingAuthor ""
+check commit missingAuthor "par"
+check commit missingAuthor "parent"
+check commit badParentSha1 "parent "
+check commit badParentSha1 "parent 1234"
+add "parent $commit"
+
+check commit missingAuthor ""
+check commit missingAuthor "au"
+check commit missingAuthor "author"
+ident_checks () {
+	check $1 missingEmail "$2 "
+	check $1 missingEmail "$2 name"
+	check $1 badEmail "$2 name <"
+	check $1 badEmail "$2 name <email"
+	check $1 missingSpaceBeforeDate "$2 name <email>"
+	check $1 badDate "$2 name <email> "
+	check $1 badDate "$2 name <email> 1234"
+	check $1 badTimezone "$2 name <email> 1234 "
+	check $1 badTimezone "$2 name <email> 1234 +"
+}
+ident_checks commit author
+add "author name <email> 1234 +0000"
+
+check commit missingCommitter ""
+check commit missingCommitter "co"
+check commit missingCommitter "committer"
+ident_checks commit committer
+add "committer name <email> 1234 +0000"
+
+reset
+check tag missingObject ""
+check tag missingObject "obj"
+check tag missingObject "object"
+check tag badObjectSha1 "object "
+check tag badObjectSha1 "object 1234"
+add "object $commit"
+
+check tag missingType ""
+check tag missingType "ty"
+check tag missingType "type"
+check tag badType "type "
+check tag badType "type com"
+add "type commit"
+
+check tag missingTagEntry ""
+check tag missingTagEntry "ta"
+check tag missingTagEntry "tag"
+check tag badTagName "tag "
+add "tag foo"
+
+check tag missingTagger ""
+check tag missingTagger "ta"
+check tag missingTagger "tagger"
+ident_checks tag tagger
+
+# trees are a binary format and can't use our earlier helpers
+test_expect_success 'truncated tree (short hash)' '
+	printf "100644 foo\0\1\1\1\1" >input &&
+	test_must_fail git hash-object -t tree input 2>err &&
+	grep badTree err
+'
+
+test_expect_success 'truncated tree (missing nul)' '
+	# these two things are indistinguishable to the parser. The important
+	# thing about this is example is that there are enough bytes to
+	# make up a hash, and that there is no NUL (and we confirm that the
+	# parser does not walk past the end of the buffer).
+	printf "100644 a long filename, or a hash with missing nul?" >input &&
+	test_must_fail git hash-object -t tree input 2>err &&
+	grep badTree err
+'
+
+test_done
diff --git a/t/t1500-rev-parse.sh b/t/t1500-rev-parse.sh
index 408b97d..a669e59 100755
--- a/t/t1500-rev-parse.sh
+++ b/t/t1500-rev-parse.sh
@@ -1,8 +1,22 @@
 #!/bin/sh
 
 test_description='test git rev-parse'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
+test_one () {
+	dir="$1" &&
+	expect="$2" &&
+	shift &&
+	shift &&
+	echo "$expect" >expect &&
+	git -C "$dir" rev-parse "$@" >actual &&
+	test_cmp expect actual
+}
+
 # usage: [options] label is-bare is-inside-git is-inside-work prefix git-dir absolute-git-dir
 test_rev_parse () {
 	d=
@@ -60,7 +74,13 @@ ROOT=$(pwd)
 
 test_expect_success 'setup' '
 	mkdir -p sub/dir work &&
-	cp -R .git repo.git
+	cp -R .git repo.git &&
+	git checkout -B main &&
+	test_commit abc &&
+	git checkout -b side &&
+	test_commit def &&
+	git checkout main &&
+	git worktree add worktree side
 '
 
 test_rev_parse toplevel false false true '' .git "$ROOT/.git"
@@ -88,6 +108,49 @@ test_rev_parse -C work -g ../repo.git -b t 'GIT_DIR=../repo.git, core.bare = tru
 
 test_rev_parse -C work -g ../repo.git -b u 'GIT_DIR=../repo.git, core.bare undefined' false false true ''
 
+test_expect_success 'rev-parse --path-format=absolute' '
+	test_one "." "$ROOT/.git" --path-format=absolute --git-dir &&
+	test_one "." "$ROOT/.git" --path-format=absolute --git-common-dir &&
+	test_one "sub/dir" "$ROOT/.git" --path-format=absolute --git-dir &&
+	test_one "sub/dir" "$ROOT/.git" --path-format=absolute --git-common-dir &&
+	test_one "worktree" "$ROOT/.git/worktrees/worktree" --path-format=absolute --git-dir &&
+	test_one "worktree" "$ROOT/.git" --path-format=absolute --git-common-dir &&
+	test_one "." "$ROOT" --path-format=absolute --show-toplevel &&
+	test_one "." "$ROOT/.git/objects" --path-format=absolute --git-path objects &&
+	test_one "." "$ROOT/.git/objects/foo/bar/baz" --path-format=absolute --git-path objects/foo/bar/baz
+'
+
+test_expect_success 'rev-parse --path-format=relative' '
+	test_one "." ".git" --path-format=relative --git-dir &&
+	test_one "." ".git" --path-format=relative --git-common-dir &&
+	test_one "sub/dir" "../../.git" --path-format=relative --git-dir &&
+	test_one "sub/dir" "../../.git" --path-format=relative --git-common-dir &&
+	test_one "worktree" "../.git/worktrees/worktree" --path-format=relative --git-dir &&
+	test_one "worktree" "../.git" --path-format=relative --git-common-dir &&
+	test_one "." "./" --path-format=relative --show-toplevel &&
+	test_one "." ".git/objects" --path-format=relative --git-path objects &&
+	test_one "." ".git/objects/foo/bar/baz" --path-format=relative --git-path objects/foo/bar/baz
+'
+
+test_expect_success '--path-format=relative does not affect --absolute-git-dir' '
+	git rev-parse --path-format=relative --absolute-git-dir >actual &&
+	echo "$ROOT/.git" >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success '--path-format can change in the middle of the command line' '
+	git rev-parse --path-format=absolute --git-dir --path-format=relative --git-path objects/foo/bar >actual &&
+	cat >expect <<-EOF &&
+	$ROOT/.git
+	.git/objects/foo/bar
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success '--path-format does not segfault without an argument' '
+	test_must_fail git rev-parse --path-format
+'
+
 test_expect_success 'git-common-dir from worktree root' '
 	echo .git >expect &&
 	git rev-parse --git-common-dir >actual &&
@@ -132,7 +195,7 @@ test_expect_success 'rev-parse --is-shallow-repository in non-shallow repo' '
 '
 
 test_expect_success 'rev-parse --show-object-format in repo' '
-	echo "$(test_oid algo)" >expect &&
+	test_oid algo >expect &&
 	git rev-parse --show-object-format >actual &&
 	test_cmp expect actual &&
 	git rev-parse --show-object-format=storage >actual &&
@@ -145,6 +208,23 @@ test_expect_success 'rev-parse --show-object-format in repo' '
 	grep "unknown mode for --show-object-format: squeamish-ossifrage" err
 '
 
+test_expect_success 'rev-parse --show-ref-format' '
+	test_detect_ref_format >expect &&
+	git rev-parse --show-ref-format >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'rev-parse --show-ref-format with invalid storage' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	(
+		cd repo &&
+		git config extensions.refstorage broken &&
+		test_must_fail git rev-parse --show-ref-format 2>err &&
+		grep "error: invalid value for ${SQ}extensions.refstorage${SQ}: ${SQ}broken${SQ}" err
+	)
+'
+
 test_expect_success '--show-toplevel from subdir of working tree' '
 	pwd >expect &&
 	git -C sub/dir rev-parse --show-toplevel >actual &&
@@ -163,7 +243,8 @@ test_expect_success 'showing the superproject correctly' '
 	test_commit -C super test_commit &&
 	test_create_repo sub &&
 	test_commit -C sub test_commit &&
-	git -C super submodule add ../sub dir/sub &&
+	git -c protocol.file.allow=always \
+		-C super submodule add ../sub dir/sub &&
 	echo $(pwd)/super >expect  &&
 	git -C super/dir/sub rev-parse --show-superproject-working-tree >out &&
 	test_cmp expect out &&
@@ -174,8 +255,8 @@ test_expect_success 'showing the superproject correctly' '
 	test_commit -C super/dir/sub branch1_commit &&
 	git -C super add dir/sub &&
 	test_commit -C super branch1_commit &&
-	git -C super checkout -b branch2 master &&
-	git -C super/dir/sub checkout -b branch2 master &&
+	git -C super checkout -b branch2 main &&
+	git -C super/dir/sub checkout -b branch2 main &&
 	test_commit -C super/dir/sub branch2_commit &&
 	git -C super add dir/sub &&
 	test_commit -C super branch2_commit &&
@@ -185,4 +266,42 @@ test_expect_success 'showing the superproject correctly' '
 	test_cmp expect out
 '
 
+# at least one external project depends on this behavior:
+test_expect_success 'rev-parse --since= unsqueezed ordering' '
+	x1=--since=1970-01-01T00:00:01Z &&
+	x2=--since=1970-01-01T00:00:02Z &&
+	x3=--since=1970-01-01T00:00:03Z &&
+	git rev-parse $x1 $x1 $x3 $x2 >actual &&
+	cat >expect <<-EOF &&
+	--max-age=1
+	--max-age=1
+	--max-age=3
+	--max-age=2
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'rev-parse --bisect includes bad, excludes good' '
+	test_commit_bulk 6 &&
+
+	git update-ref refs/bisect/bad-1 HEAD~1 &&
+	git update-ref refs/bisect/b HEAD~2 &&
+	git update-ref refs/bisect/bad-3 HEAD~3 &&
+	git update-ref refs/bisect/good-3 HEAD~3 &&
+	git update-ref refs/bisect/bad-4 HEAD~4 &&
+	git update-ref refs/bisect/go HEAD~4 &&
+
+	# Note: refs/bisect/b and refs/bisect/go should be ignored because they
+	# do not match the refs/bisect/bad or refs/bisect/good prefixes.
+	cat >expect <<-EOF &&
+	refs/bisect/bad-1
+	refs/bisect/bad-3
+	refs/bisect/bad-4
+	^refs/bisect/good-3
+	EOF
+
+	git rev-parse --symbolic-full-name --bisect >actual &&
+	test_cmp expect actual
+'
+
 test_done
diff --git a/t/t1501-work-tree.sh b/t/t1501-work-tree.sh
index b755580..ae6528a 100755
--- a/t/t1501-work-tree.sh
+++ b/t/t1501-work-tree.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='test separate work tree'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
diff --git a/t/t1502-rev-parse-parseopt.sh b/t/t1502-rev-parse-parseopt.sh
index a859abe..b754b9f 100755
--- a/t/t1502-rev-parse-parseopt.sh
+++ b/t/t1502-rev-parse-parseopt.sh
@@ -3,13 +3,29 @@
 test_description='test git rev-parse --parseopt'
 . ./test-lib.sh
 
+check_invalid_long_option () {
+	spec="$1"
+	opt="$2"
+	test_expect_success "test --parseopt invalid switch $opt help output for $spec" '
+		{
+			cat <<-\EOF &&
+			error: unknown option `'${opt#--}\''
+			EOF
+			sed -e 1d -e \$d <"$TEST_DIRECTORY/t1502/$spec.help"
+		} >expect &&
+		test_expect_code 129 git rev-parse --parseopt -- $opt \
+			2>output <"$TEST_DIRECTORY/t1502/$spec" &&
+		test_cmp expect output
+	'
+}
+
 test_expect_success 'setup optionspec' '
 	sed -e "s/^|//" >optionspec <<\EOF
 |some-command [options] <args>...
 |
 |some-command does foo and bar!
 |--
-|h,help    show the help
+|h,help!   show the help
 |
 |foo       some nifty option --foo
 |bar=      some cool option --bar with an argument
@@ -58,44 +74,8 @@ EOF
 '
 
 test_expect_success 'test --parseopt help output' '
-	sed -e "s/^|//" >expect <<\END_EXPECT &&
-|cat <<\EOF
-|usage: some-command [options] <args>...
-|
-|    some-command does foo and bar!
-|
-|    -h, --help            show the help
-|    --foo                 some nifty option --foo
-|    --bar ...             some cool option --bar with an argument
-|    -b, --baz             a short and long option
-|
-|An option group Header
-|    -C[...]               option C with an optional argument
-|    -d, --data[=...]      short and long option with an optional argument
-|
-|Argument hints
-|    -B <arg>              short option required argument
-|    --bar2 <arg>          long option required argument
-|    -e, --fuz <with-space>
-|                          short and long option required argument
-|    -s[<some>]            short option optional argument
-|    --long[=<data>]       long option optional argument
-|    -g, --fluf[=<path>]   short and long option optional argument
-|    --longest <very-long-argument-hint>
-|                          a very long argument hint
-|    --pair <key=value>    with an equals sign in the hint
-|    --aswitch             help te=t contains? fl*g characters!`
-|    --bswitch <hint>      hint has trailing tab character
-|    --cswitch             switch has trailing tab character
-|    --short-hint <a>      with a one symbol hint
-|
-|Extras
-|    --extra1              line above used to cause a segfault but no longer does
-|
-|EOF
-END_EXPECT
 	test_expect_code 129 git rev-parse --parseopt -- -h > output < optionspec &&
-	test_i18ncmp expect output
+	test_cmp "$TEST_DIRECTORY/t1502/optionspec.help" output
 '
 
 test_expect_success 'test --parseopt help output no switches' '
@@ -108,7 +88,7 @@ test_expect_success 'test --parseopt help output no switches' '
 |EOF
 END_EXPECT
 	test_expect_code 129 git rev-parse --parseopt -- -h > output < optionspec_no_switches &&
-	test_i18ncmp expect output
+	test_cmp expect output
 '
 
 test_expect_success 'test --parseopt help output hidden switches' '
@@ -121,7 +101,7 @@ test_expect_success 'test --parseopt help output hidden switches' '
 |EOF
 END_EXPECT
 	test_expect_code 129 git rev-parse --parseopt -- -h > output < optionspec_only_hidden_switches &&
-	test_i18ncmp expect output
+	test_cmp expect output
 '
 
 test_expect_success 'test --parseopt help-all output hidden switches' '
@@ -131,52 +111,23 @@ test_expect_success 'test --parseopt help-all output hidden switches' '
 |
 |    some-command does foo and bar!
 |
-|    --hidden1             A hidden switch
+|    --[no-]hidden1        A hidden switch
 |
 |EOF
 END_EXPECT
 	test_expect_code 129 git rev-parse --parseopt -- --help-all > output < optionspec_only_hidden_switches &&
-	test_i18ncmp expect output
+	test_cmp expect output
 '
 
 test_expect_success 'test --parseopt invalid switch help output' '
-	sed -e "s/^|//" >expect <<\END_EXPECT &&
-|error: unknown option `does-not-exist'\''
-|usage: some-command [options] <args>...
-|
-|    some-command does foo and bar!
-|
-|    -h, --help            show the help
-|    --foo                 some nifty option --foo
-|    --bar ...             some cool option --bar with an argument
-|    -b, --baz             a short and long option
-|
-|An option group Header
-|    -C[...]               option C with an optional argument
-|    -d, --data[=...]      short and long option with an optional argument
-|
-|Argument hints
-|    -B <arg>              short option required argument
-|    --bar2 <arg>          long option required argument
-|    -e, --fuz <with-space>
-|                          short and long option required argument
-|    -s[<some>]            short option optional argument
-|    --long[=<data>]       long option optional argument
-|    -g, --fluf[=<path>]   short and long option optional argument
-|    --longest <very-long-argument-hint>
-|                          a very long argument hint
-|    --pair <key=value>    with an equals sign in the hint
-|    --aswitch             help te=t contains? fl*g characters!`
-|    --bswitch <hint>      hint has trailing tab character
-|    --cswitch             switch has trailing tab character
-|    --short-hint <a>      with a one symbol hint
-|
-|Extras
-|    --extra1              line above used to cause a segfault but no longer does
-|
-END_EXPECT
+	{
+		cat <<-\EOF &&
+		error: unknown option `does-not-exist'\''
+		EOF
+		sed -e 1d -e \$d <"$TEST_DIRECTORY/t1502/optionspec.help"
+	} >expect &&
 	test_expect_code 129 git rev-parse --parseopt -- --does-not-exist 1>/dev/null 2>output < optionspec &&
-	test_i18ncmp expect output
+	test_cmp expect output
 '
 
 test_expect_success 'setup expect.1' "
@@ -282,4 +233,104 @@ test_expect_success 'test --parseopt --stuck-long and short option with unset op
 	test_cmp expect output
 '
 
+test_expect_success 'test --parseopt help output: "wrapped" options normal "or:" lines' '
+	sed -e "s/^|//" >spec <<-\EOF &&
+	|cmd [--some-option]
+	|    [--another-option]
+	|cmd [--yet-another-option]
+	|--
+	|h,help!   show the help
+	EOF
+
+	sed -e "s/^|//" >expect <<-\END_EXPECT &&
+	|cat <<\EOF
+	|usage: cmd [--some-option]
+	|   or:     [--another-option]
+	|   or: cmd [--yet-another-option]
+	|
+	|    -h, --help            show the help
+	|
+	|EOF
+	END_EXPECT
+
+	test_must_fail git rev-parse --parseopt -- -h <spec >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'test --parseopt invalid opt-spec' '
+	test_write_lines x -- "=, x" >spec &&
+	echo "fatal: missing opt-spec before option flags" >expect &&
+	test_must_fail git rev-parse --parseopt -- <spec 2>err &&
+	test_cmp expect err
+'
+
+test_expect_success 'test --parseopt help output: multi-line blurb after empty line' '
+	sed -e "s/^|//" >spec <<-\EOF &&
+	|cmd [--some-option]
+	|    [--another-option]
+	|
+	|multi
+	|line
+	|blurb
+	|--
+	|h,help!   show the help
+	EOF
+
+	sed -e "s/^|//" >expect <<-\END_EXPECT &&
+	|cat <<\EOF
+	|usage: cmd [--some-option]
+	|   or:     [--another-option]
+	|
+	|    multi
+	|    line
+	|    blurb
+	|
+	|    -h, --help            show the help
+	|
+	|EOF
+	END_EXPECT
+
+	test_must_fail git rev-parse --parseopt -- -h <spec >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'test --parseopt help output for optionspec-neg' '
+	test_expect_code 129 git rev-parse --parseopt -- \
+		-h >output <"$TEST_DIRECTORY/t1502/optionspec-neg" &&
+	test_cmp "$TEST_DIRECTORY/t1502/optionspec-neg.help" output
+'
+
+test_expect_success 'test --parseopt valid options for optionspec-neg' '
+	cat >expect <<-\EOF &&
+	set -- --foo --no-foo --no-bar --positive-only --no-negative --
+	EOF
+	git rev-parse --parseopt -- <"$TEST_DIRECTORY/t1502/optionspec-neg" >output \
+	       --foo --no-foo --no-bar --positive-only --no-negative &&
+	test_cmp expect output
+'
+
+test_expect_success 'test --parseopt positivated option for optionspec-neg' '
+	cat >expect <<-\EOF &&
+	set -- --no-no-bar --no-no-bar --
+	EOF
+	git rev-parse --parseopt -- <"$TEST_DIRECTORY/t1502/optionspec-neg" >output \
+	       --no-no-bar --bar &&
+	test_cmp expect output
+'
+
+check_invalid_long_option optionspec-neg --no-positive-only
+check_invalid_long_option optionspec-neg --negative
+check_invalid_long_option optionspec-neg --no-no-negative
+
+test_expect_success 'ambiguous: --no matches both --noble and --no-noble' '
+	cat >spec <<-\EOF &&
+	some-command [options]
+	--
+	noble The feudal switch.
+	EOF
+	test_expect_code 129 env GIT_TEST_DISALLOW_ABBREVIATED_OPTIONS=false \
+	git rev-parse --parseopt -- <spec 2>err --no &&
+	grep "error: ambiguous option: no (could be --noble or --no-noble)" err
+'
+
 test_done
diff --git a/t/t1502/.gitattributes b/t/t1502/.gitattributes
new file mode 100644
index 0000000..562b12e
--- /dev/null
+++ b/t/t1502/.gitattributes
@@ -0,0 +1 @@
+* -whitespace
diff --git a/t/t1502/optionspec-neg b/t/t1502/optionspec-neg
new file mode 100644
index 0000000..392f43e
--- /dev/null
+++ b/t/t1502/optionspec-neg
@@ -0,0 +1,8 @@
+some-command [options] <args>...
+
+some-command does foo and bar!
+--
+foo		can be negated
+no-bar		can be positivated
+positive-only!	cannot be negated
+no-negative!	cannot be positivated
diff --git a/t/t1502/optionspec-neg.help b/t/t1502/optionspec-neg.help
new file mode 100644
index 0000000..7a29f8c
--- /dev/null
+++ b/t/t1502/optionspec-neg.help
@@ -0,0 +1,12 @@
+cat <<\EOF
+usage: some-command [options] <args>...
+
+    some-command does foo and bar!
+
+    --[no-]foo            can be negated
+    --no-bar              can be positivated
+    --bar                 opposite of --no-bar
+    --positive-only       cannot be negated
+    --no-negative         cannot be positivated
+
+EOF
diff --git a/t/t1502/optionspec.help b/t/t1502/optionspec.help
new file mode 100755
index 0000000..cbdd54d
--- /dev/null
+++ b/t/t1502/optionspec.help
@@ -0,0 +1,36 @@
+cat <<\EOF
+usage: some-command [options] <args>...
+
+    some-command does foo and bar!
+
+    -h, --help            show the help
+    --[no-]foo            some nifty option --foo
+    --[no-]bar ...        some cool option --bar with an argument
+    -b, --[no-]baz        a short and long option
+
+An option group Header
+    -C[...]               option C with an optional argument
+    -d, --[no-]data[=...] short and long option with an optional argument
+
+Argument hints
+    -B <arg>              short option required argument
+    --[no-]bar2 <arg>     long option required argument
+    -e, --[no-]fuz <with-space>
+                          short and long option required argument
+    -s[<some>]            short option optional argument
+    --[no-]long[=<data>]  long option optional argument
+    -g, --[no-]fluf[=<path>]
+                          short and long option optional argument
+    --[no-]longest <very-long-argument-hint>
+                          a very long argument hint
+    --[no-]pair <key=value>
+                          with an equals sign in the hint
+    --[no-]aswitch        help te=t contains? fl*g characters!`
+    --[no-]bswitch <hint> hint has trailing tab character
+    --[no-]cswitch        switch has trailing tab character
+    --[no-]short-hint <a> with a one symbol hint
+
+Extras
+    --[no-]extra1         line above used to cause a segfault but no longer does
+
+EOF
diff --git a/t/t1503-rev-parse-verify.sh b/t/t1503-rev-parse-verify.sh
index 492edff..79df65e 100755
--- a/t/t1503-rev-parse-verify.sh
+++ b/t/t1503-rev-parse-verify.sh
@@ -6,6 +6,10 @@ test_description='test git rev-parse --verify'
 
 exec </dev/null
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 add_line_into_file()
@@ -51,8 +55,8 @@ test_expect_success 'works with one good rev' '
 	test "$rev_hash3" = "$HASH3" &&
 	rev_hash4=$(git rev-parse --verify $HASH4) &&
 	test "$rev_hash4" = "$HASH4" &&
-	rev_master=$(git rev-parse --verify master) &&
-	test "$rev_master" = "$HASH4" &&
+	rev_main=$(git rev-parse --verify main) &&
+	test "$rev_main" = "$HASH4" &&
 	rev_head=$(git rev-parse --verify HEAD) &&
 	test "$rev_head" = "$HASH4"
 '
@@ -86,8 +90,8 @@ test_expect_success 'fails silently when using -q' '
 test_expect_success 'fails silently when using -q with deleted reflogs' '
 	ref=$(git rev-parse HEAD) &&
 	git update-ref --create-reflog -m "message for refs/test" refs/test "$ref" &&
-	git reflog delete --updateref --rewrite refs/test@{0} &&
-	test_must_fail git rev-parse -q --verify refs/test@{0} >error 2>&1 &&
+	git reflog delete --updateref --rewrite refs/test@{1} &&
+	test_must_fail git rev-parse -q --verify refs/test@{1} >error 2>&1 &&
 	test_must_be_empty error
 '
 
@@ -116,32 +120,41 @@ test_expect_success 'no stdout output on error' '
 '
 
 test_expect_success 'use --default' '
-	git rev-parse --verify --default master &&
-	git rev-parse --verify --default master HEAD &&
-	git rev-parse --default master --verify &&
-	git rev-parse --default master --verify HEAD &&
-	git rev-parse --verify HEAD --default master &&
-	test_must_fail git rev-parse --verify foo --default master &&
+	git rev-parse --verify --default main &&
+	git rev-parse --verify --default main HEAD &&
+	git rev-parse --default main --verify &&
+	git rev-parse --default main --verify HEAD &&
+	git rev-parse --verify HEAD --default main &&
+	test_must_fail git rev-parse --verify foo --default main &&
 	test_must_fail git rev-parse --default HEAD --verify bar &&
 	test_must_fail git rev-parse --verify --default HEAD baz &&
 	test_must_fail git rev-parse --default foo --verify &&
 	test_must_fail git rev-parse --verify --default bar
 '
 
-test_expect_success 'master@{n} for various n' '
-	N=$(git reflog | wc -l) &&
+test_expect_success 'main@{n} for various n' '
+	git reflog >out &&
+	N=$(wc -l <out) &&
 	Nm1=$(($N-1)) &&
 	Np1=$(($N+1)) &&
-	git rev-parse --verify master@{0} &&
-	git rev-parse --verify master@{1} &&
-	git rev-parse --verify master@{$Nm1} &&
-	test_must_fail git rev-parse --verify master@{$N} &&
-	test_must_fail git rev-parse --verify master@{$Np1}
+	git rev-parse --verify main@{0} &&
+	git rev-parse --verify main@{1} &&
+	git rev-parse --verify main@{$Nm1} &&
+	test_must_fail git rev-parse --verify main@{$N} &&
+	test_must_fail git rev-parse --verify main@{$Np1}
 '
 
-test_expect_success SYMLINKS 'ref resolution not confused by broken symlinks' '
-	ln -s does-not-exist .git/refs/heads/broken &&
-	test_must_fail git rev-parse --verify broken
+test_expect_success 'options can appear after --verify' '
+	git rev-parse --verify HEAD >expect &&
+	git rev-parse --verify -q HEAD >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'verify respects --end-of-options' '
+	git update-ref refs/heads/-tricky HEAD &&
+	git rev-parse --verify HEAD >expect &&
+	git rev-parse --verify --end-of-options -tricky >actual &&
+	test_cmp expect actual
 '
 
 test_done
diff --git a/t/t1504-ceiling-dirs.sh b/t/t1504-ceiling-dirs.sh
index 3d51615..c1679e3 100755
--- a/t/t1504-ceiling-dirs.sh
+++ b/t/t1504-ceiling-dirs.sh
@@ -1,11 +1,17 @@
 #!/bin/sh
 
 test_description='test GIT_CEILING_DIRECTORIES'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_prefix() {
-	test_expect_success "$1" \
-	"test '$2' = \"\$(git rev-parse --show-prefix)\""
+	local expect="$2" &&
+	test_expect_success "$1: git rev-parse --show-prefix is '$2'" '
+		echo "$expect" >expect &&
+		git rev-parse --show-prefix >actual &&
+		test_cmp expect actual
+	'
 }
 
 test_fail() {
diff --git a/t/t1505-rev-parse-last.sh b/t/t1505-rev-parse-last.sh
index 4969edb..4a5758f 100755
--- a/t/t1505-rev-parse-last.sh
+++ b/t/t1505-rev-parse-last.sh
@@ -2,6 +2,10 @@
 
 test_description='test @{-N} syntax'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 
@@ -20,12 +24,12 @@ test_expect_success 'setup' '
 	make_commit 3 &&
 	git checkout side &&
 	make_commit 4 &&
-	git merge master &&
-	git checkout master
+	git merge main &&
+	git checkout main
 
 '
 
-# 1 -- 2 -- 3 master
+# 1 -- 2 -- 3 main
 #  \         \
 #   \         \
 #    --- 4 --- 5 side
@@ -49,7 +53,7 @@ test_expect_success '@{-1}@{1} works' '
 '
 
 test_expect_success '@{-2} works' '
-	test_cmp_rev master @{-2}
+	test_cmp_rev main @{-2}
 '
 
 test_expect_success '@{-3} fails' '
diff --git a/t/t1506-rev-parse-diagnosis.sh b/t/t1506-rev-parse-diagnosis.sh
index dbf690b..ef40511 100755
--- a/t/t1506-rev-parse-diagnosis.sh
+++ b/t/t1506-rev-parse-diagnosis.sh
@@ -4,6 +4,10 @@ test_description='test git rev-parse diagnosis for invalid argument'
 
 exec </dev/null
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_did_you_mean ()
@@ -12,7 +16,7 @@ test_did_you_mean ()
 	fatal: path '$2$3' $4, but not ${5:-$SQ$3$SQ}
 	hint: Did you mean '$1:$2$3'${2:+ aka $SQ$1:./$3$SQ}?
 	EOF
-	test_i18ncmp expected error
+	test_cmp expected error
 }
 
 HASH_file=
@@ -103,16 +107,16 @@ test_expect_success 'correct relative file objects (6)' '
 
 test_expect_success 'incorrect revision id' '
 	test_must_fail git rev-parse foobar:file.txt 2>error &&
-	test_i18ngrep "invalid object name .foobar." error &&
+	test_grep "invalid object name .foobar." error &&
 	test_must_fail git rev-parse foobar 2>error &&
-	test_i18ngrep "unknown revision or path not in the working tree." error
+	test_grep "unknown revision or path not in the working tree." error
 '
 
 test_expect_success 'incorrect file in sha1:path' '
 	test_must_fail git rev-parse HEAD:nothing.txt 2>error &&
-	test_i18ngrep "path .nothing.txt. does not exist in .HEAD." error &&
+	test_grep "path .nothing.txt. does not exist in .HEAD." error &&
 	test_must_fail git rev-parse HEAD:index-only.txt 2>error &&
-	test_i18ngrep "path .index-only.txt. exists on disk, but not in .HEAD." error &&
+	test_grep "path .index-only.txt. exists on disk, but not in .HEAD." error &&
 	(cd subdir &&
 	 test_must_fail git rev-parse HEAD:file2.txt 2>error &&
 	 test_did_you_mean HEAD subdir/ file2.txt exists )
@@ -120,9 +124,9 @@ test_expect_success 'incorrect file in sha1:path' '
 
 test_expect_success 'incorrect file in :path and :N:path' '
 	test_must_fail git rev-parse :nothing.txt 2>error &&
-	test_i18ngrep "path .nothing.txt. does not exist (neither on disk nor in the index)" error &&
+	test_grep "path .nothing.txt. does not exist (neither on disk nor in the index)" error &&
 	test_must_fail git rev-parse :1:nothing.txt 2>error &&
-	test_i18ngrep "path .nothing.txt. does not exist (neither on disk nor in the index)" error &&
+	test_grep "path .nothing.txt. does not exist (neither on disk nor in the index)" error &&
 	test_must_fail git rev-parse :1:file.txt 2>error &&
 	test_did_you_mean ":0" "" file.txt "is in the index" "at stage 1" &&
 	(cd subdir &&
@@ -133,42 +137,42 @@ test_expect_success 'incorrect file in :path and :N:path' '
 	 test_must_fail git rev-parse :2:file2.txt 2>error &&
 	 test_did_you_mean :0 subdir/ file2.txt "is in the index") &&
 	test_must_fail git rev-parse :disk-only.txt 2>error &&
-	test_i18ngrep "path .disk-only.txt. exists on disk, but not in the index" error
+	test_grep "path .disk-only.txt. exists on disk, but not in the index" error
 '
 
 test_expect_success 'invalid @{n} reference' '
-	test_must_fail git rev-parse master@{99999} >output 2>error &&
+	test_must_fail git rev-parse main@{99999} >output 2>error &&
 	test_must_be_empty output &&
-	test_i18ngrep "log for [^ ]* only has [0-9][0-9]* entries" error  &&
-	test_must_fail git rev-parse --verify master@{99999} >output 2>error &&
+	test_grep "log for [^ ]* only has [0-9][0-9]* entries" error  &&
+	test_must_fail git rev-parse --verify main@{99999} >output 2>error &&
 	test_must_be_empty output &&
-	test_i18ngrep "log for [^ ]* only has [0-9][0-9]* entries" error
+	test_grep "log for [^ ]* only has [0-9][0-9]* entries" error
 '
 
 test_expect_success 'relative path not found' '
 	(
 		cd subdir &&
 		test_must_fail git rev-parse HEAD:./nonexistent.txt 2>error &&
-		test_i18ngrep subdir/nonexistent.txt error
+		test_grep subdir/nonexistent.txt error
 	)
 '
 
 test_expect_success 'relative path outside worktree' '
 	test_must_fail git rev-parse HEAD:../file.txt >output 2>error &&
 	test_must_be_empty output &&
-	test_i18ngrep "outside repository" error
+	test_grep "outside repository" error
 '
 
 test_expect_success 'relative path when cwd is outside worktree' '
 	test_must_fail git --git-dir=.git --work-tree=subdir rev-parse HEAD:./file.txt >output 2>error &&
 	test_must_be_empty output &&
-	test_i18ngrep "relative path syntax can.t be used outside working tree" error
+	test_grep "relative path syntax can.t be used outside working tree" error
 '
 
 test_expect_success '<commit>:file correctly diagnosed after a pathname' '
 	test_must_fail git rev-parse file.txt HEAD:file.txt 1>actual 2>error &&
-	test_i18ngrep ! "exists on disk" error &&
-	test_i18ngrep "no such path in the working tree" error &&
+	test_grep ! "exists on disk" error &&
+	test_grep "no such path in the working tree" error &&
 	cat >expect <<-\EOF &&
 	file.txt
 	HEAD:file.txt
@@ -190,15 +194,33 @@ test_expect_success 'dotdot is not an empty set' '
 	test_cmp expect actual
 '
 
+test_expect_success 'dotdot does not peel endpoints' '
+	git tag -a -m "annote" annotated HEAD &&
+	A=$(git rev-parse annotated) &&
+	H=$(git rev-parse annotated^0) &&
+	{
+		echo $A && echo ^$A
+	} >expect-with-two-dots &&
+	{
+		echo $A && echo $A && echo ^$H
+	} >expect-with-merge-base &&
+
+	git rev-parse annotated..annotated >actual-with-two-dots &&
+	test_cmp expect-with-two-dots actual-with-two-dots &&
+
+	git rev-parse annotated...annotated >actual-with-merge-base &&
+	test_cmp expect-with-merge-base actual-with-merge-base
+'
+
 test_expect_success 'arg before dashdash must be a revision (missing)' '
 	test_must_fail git rev-parse foobar -- 2>stderr &&
-	test_i18ngrep "bad revision" stderr
+	test_grep "bad revision" stderr
 '
 
 test_expect_success 'arg before dashdash must be a revision (file)' '
 	>foobar &&
 	test_must_fail git rev-parse foobar -- 2>stderr &&
-	test_i18ngrep "bad revision" stderr
+	test_grep "bad revision" stderr
 '
 
 test_expect_success 'arg before dashdash must be a revision (ambiguous)' '
@@ -236,4 +258,29 @@ test_expect_success 'escaped char does not trigger wildcard rule' '
 	test_must_fail git rev-parse "foo\\*bar"
 '
 
+test_expect_success 'arg after dashdash not interpreted as option' '
+	cat >expect <<-\EOF &&
+	--
+	--local-env-vars
+	EOF
+	git rev-parse -- --local-env-vars >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'arg after end-of-options not interpreted as option' '
+	test_must_fail git rev-parse --end-of-options --not-real -- 2>err &&
+	test_grep bad.revision.*--not-real err
+'
+
+test_expect_success 'end-of-options still allows --' '
+	cat >expect <<-EOF &&
+	--end-of-options
+	$(git rev-parse --verify HEAD)
+	--
+	path
+	EOF
+	git rev-parse --end-of-options HEAD -- path >actual &&
+	test_cmp expect actual
+'
+
 test_done
diff --git a/t/t1507-rev-parse-upstream.sh b/t/t1507-rev-parse-upstream.sh
index dfc0d96..b9af6b3 100755
--- a/t/t1507-rev-parse-upstream.sh
+++ b/t/t1507-rev-parse-upstream.sh
@@ -2,6 +2,10 @@
 
 test_description='test <branch>@{upstream} syntax'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 
@@ -10,20 +14,20 @@ test_expect_success 'setup' '
 	test_commit 1 &&
 	git checkout -b side &&
 	test_commit 2 &&
-	git checkout master &&
+	git checkout main &&
 	git clone . clone &&
 	test_commit 3 &&
 	(cd clone &&
 	 test_commit 4 &&
 	 git branch --track my-side origin/side &&
-	 git branch --track local-master master &&
+	 git branch --track local-main main &&
 	 git branch --track fun@ny origin/side &&
 	 git branch --track @funny origin/side &&
 	 git branch --track funny@ origin/side &&
-	 git remote add -t master master-only .. &&
-	 git fetch master-only &&
+	 git remote add -t main main-only .. &&
+	 git fetch main-only &&
 	 git branch bad-upstream &&
-	 git config branch.bad-upstream.remote master-only &&
+	 git config branch.bad-upstream.remote main-only &&
 	 git config branch.bad-upstream.merge refs/heads/side
 	)
 '
@@ -39,7 +43,7 @@ error_message () {
 }
 
 test_expect_success '@{upstream} resolves to correct full name' '
-	echo refs/remotes/origin/master >expect &&
+	echo refs/remotes/origin/main >expect &&
 	git -C clone rev-parse --symbolic-full-name @{upstream} >actual &&
 	test_cmp expect actual &&
 	git -C clone rev-parse --symbolic-full-name @{UPSTREAM} >actual &&
@@ -49,7 +53,7 @@ test_expect_success '@{upstream} resolves to correct full name' '
 '
 
 test_expect_success '@{u} resolves to correct full name' '
-	echo refs/remotes/origin/master >expect &&
+	echo refs/remotes/origin/main >expect &&
 	git -C clone rev-parse --symbolic-full-name @{u} >actual &&
 	test_cmp expect actual &&
 	git -C clone rev-parse --symbolic-full-name @{U} >actual &&
@@ -94,7 +98,8 @@ test_expect_success 'my-side@{u} resolves to correct commit' '
 	commit_subject my-side >actual &&
 	test_cmp expect actual &&
 	echo 5 >expect &&
-	commit_subject my-side@{u} >actual
+	commit_subject my-side@{u} >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success 'not-tracking@{u} fails' '
@@ -132,7 +137,7 @@ test_expect_success 'checkout -b new my-side@{u} forks from the same' '
 test_expect_success 'merge my-side@{u} records the correct name' '
 (
 	cd clone &&
-	git checkout master &&
+	git checkout main &&
 	test_might_fail git branch -D new &&
 	git branch -t new my-side@{u} &&
 	git merge -s ours new@{u} &&
@@ -143,24 +148,24 @@ test_expect_success 'merge my-side@{u} records the correct name' '
 '
 
 test_expect_success 'branch -d other@{u}' '
-	git checkout -t -b other master &&
+	git checkout -t -b other main &&
 	git branch -d @{u} &&
-	git for-each-ref refs/heads/master >actual &&
+	git for-each-ref refs/heads/main >actual &&
 	test_must_be_empty actual
 '
 
 test_expect_success 'checkout other@{u}' '
-	git branch -f master HEAD &&
-	git checkout -t -b another master &&
+	git branch -f main HEAD &&
+	git checkout -t -b another main &&
 	git checkout @{u} &&
 	git symbolic-ref HEAD >actual &&
-	echo refs/heads/master >expect &&
+	echo refs/heads/main >expect &&
 	test_cmp expect actual
 '
 
 test_expect_success 'branch@{u} works when tracking a local branch' '
-	echo refs/heads/master >expect &&
-	git -C clone rev-parse --symbolic-full-name local-master@{u} >actual &&
+	echo refs/heads/main >expect &&
+	git -C clone rev-parse --symbolic-full-name local-main@{u} >actual &&
 	test_cmp expect actual
 '
 
@@ -169,15 +174,20 @@ test_expect_success 'branch@{u} error message when no upstream' '
 	fatal: no upstream configured for branch ${SQ}non-tracking${SQ}
 	EOF
 	error_message non-tracking@{u} &&
-	test_i18ncmp expect error
+	test_cmp expect error
 '
 
 test_expect_success '@{u} error message when no upstream' '
 	cat >expect <<-EOF &&
-	fatal: no upstream configured for branch ${SQ}master${SQ}
+	fatal: no upstream configured for branch ${SQ}main${SQ}
 	EOF
 	test_must_fail git rev-parse --verify @{u} 2>actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
+'
+
+test_expect_success '@{u} silent error when no upstream' '
+	test_must_fail git rev-parse --verify --quiet @{u} 2>actual &&
+	test_must_be_empty actual
 '
 
 test_expect_success 'branch@{u} error message with misspelt branch' '
@@ -185,7 +195,7 @@ test_expect_success 'branch@{u} error message with misspelt branch' '
 	fatal: no such branch: ${SQ}no-such-branch${SQ}
 	EOF
 	error_message no-such-branch@{u} &&
-	test_i18ncmp expect error
+	test_cmp expect error
 '
 
 test_expect_success '@{u} error message when not on a branch' '
@@ -194,7 +204,7 @@ test_expect_success '@{u} error message when not on a branch' '
 	EOF
 	git checkout HEAD^0 &&
 	test_must_fail git rev-parse --verify @{u} 2>actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 test_expect_success 'branch@{u} error message if upstream branch not fetched' '
@@ -202,20 +212,20 @@ test_expect_success 'branch@{u} error message if upstream branch not fetched' '
 	fatal: upstream branch ${SQ}refs/heads/side${SQ} not stored as a remote-tracking branch
 	EOF
 	error_message bad-upstream@{u} &&
-	test_i18ncmp expect error
+	test_cmp expect error
 '
 
 test_expect_success 'pull works when tracking a local branch' '
 (
 	cd clone &&
-	git checkout local-master &&
+	git checkout local-main &&
 	git pull
 )
 '
 
 # makes sense if the previous one succeeded
 test_expect_success '@{u} works when tracking a local branch' '
-	echo refs/heads/master >expect &&
+	echo refs/heads/main >expect &&
 	git -C clone rev-parse --symbolic-full-name @{u} >actual &&
 	test_cmp expect actual
 '
@@ -224,7 +234,7 @@ test_expect_success 'log -g other@{u}' '
 	commit=$(git rev-parse HEAD) &&
 	cat >expect <<-EOF &&
 	commit $commit
-	Reflog: master@{0} (C O Mitter <committer@example.com>)
+	Reflog: main@{0} (C O Mitter <committer@example.com>)
 	Reflog message: branch: Created from HEAD
 	Author: A U Thor <author@example.com>
 	Date:   Thu Apr 7 15:15:13 2005 -0700
@@ -239,7 +249,7 @@ test_expect_success 'log -g other@{u}@{now}' '
 	commit=$(git rev-parse HEAD) &&
 	cat >expect <<-EOF &&
 	commit $commit
-	Reflog: master@{Thu Apr 7 15:17:13 2005 -0700} (C O Mitter <committer@example.com>)
+	Reflog: main@{Thu Apr 7 15:17:13 2005 -0700} (C O Mitter <committer@example.com>)
 	Reflog message: branch: Created from HEAD
 	Author: A U Thor <author@example.com>
 	Date:   Thu Apr 7 15:15:13 2005 -0700
@@ -255,7 +265,8 @@ test_expect_success '@{reflog}-parsing does not look beyond colon' '
 	git add @{yesterday} &&
 	git commit -m "funny reflog file" &&
 	git hash-object @{yesterday} >expect &&
-	git rev-parse HEAD:@{yesterday} >actual
+	git rev-parse HEAD:@{yesterday} >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success '@{upstream}-parsing does not look beyond colon' '
@@ -263,7 +274,8 @@ test_expect_success '@{upstream}-parsing does not look beyond colon' '
 	git add @{upstream} &&
 	git commit -m "funny upstream file" &&
 	git hash-object @{upstream} >expect &&
-	git rev-parse HEAD:@{upstream} >actual
+	git rev-parse HEAD:@{upstream} >actual &&
+	test_cmp expect actual
 '
 
 test_done
diff --git a/t/t1508-at-combinations.sh b/t/t1508-at-combinations.sh
index 4a9964e..e841309 100755
--- a/t/t1508-at-combinations.sh
+++ b/t/t1508-at-combinations.sh
@@ -1,6 +1,10 @@
 #!/bin/sh
 
 test_description='test various @{X} syntax combinations together'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 check() {
@@ -30,8 +34,8 @@ fail() {
 }
 
 test_expect_success 'setup' '
-	test_commit master-one &&
-	test_commit master-two &&
+	test_commit main-one &&
+	test_commit main-two &&
 	git checkout -b upstream-branch &&
 	test_commit upstream-one &&
 	test_commit upstream-two &&
@@ -47,7 +51,7 @@ test_expect_success 'setup' '
 	git checkout -b new-branch &&
 	test_commit new-one &&
 	test_commit new-two &&
-	git branch -u master old-branch &&
+	git branch -u main old-branch &&
 	git branch -u upstream-branch new-branch
 '
 
@@ -62,8 +66,8 @@ check "@{-1}@{1}" commit old-one
 check "@{u}" ref refs/heads/upstream-branch
 check "HEAD@{u}" ref refs/heads/upstream-branch
 check "@{u}@{1}" commit upstream-one
-check "@{-1}@{u}" ref refs/heads/master
-check "@{-1}@{u}@{1}" commit master-one
+check "@{-1}@{u}" ref refs/heads/main
+check "@{-1}@{u}@{1}" commit main-one
 check "@" commit new-two
 check "@@{u}" ref refs/heads/upstream-branch
 check "@@/at-test" ref refs/heads/@@/at-test
@@ -99,4 +103,17 @@ test_expect_success 'create path with @' '
 check "@:normal" blob content
 check "@:fun@ny" blob content
 
+test_expect_success '@{1} works with only one reflog entry' '
+	git checkout -B newbranch main &&
+	git reflog expire --expire=now refs/heads/newbranch &&
+	git commit --allow-empty -m "first after expiration" &&
+	test_cmp_rev newbranch~ newbranch@{1}
+'
+
+test_expect_success '@{0} works with empty reflog' '
+	git checkout -B newbranch main &&
+	git reflog expire --expire=now refs/heads/newbranch &&
+	test_cmp_rev newbranch newbranch@{0}
+'
+
 test_done
diff --git a/t/t1509-root-work-tree.sh b/t/t1509-root-work-tree.sh
index fd2f7ab..c799f5b 100755
--- a/t/t1509-root-work-tree.sh
+++ b/t/t1509-root-work-tree.sh
@@ -221,7 +221,8 @@ test_expect_success 'setup' '
 	rm -rf /.git &&
 	echo "Initialized empty Git repository in /.git/" > expected &&
 	git init > result &&
-	test_i18ncmp expected result
+	test_cmp expected result &&
+	git config --global --add safe.directory /
 '
 
 test_vars 'auto gitdir, root' ".git" "/" ""
@@ -242,11 +243,11 @@ say "auto bare gitdir"
 # DESTROYYYYY!!!!!
 test_expect_success 'setup' '
 	rm -rf /refs /objects /info /hooks &&
-	rm -f /expected /ls.expected /me /result &&
+	rm -f /HEAD /expected /ls.expected /me /result &&
 	cd / &&
 	echo "Initialized empty Git repository in /" > expected &&
 	git init --bare > result &&
-	test_i18ncmp expected result
+	test_cmp expected result
 '
 
 test_vars 'auto gitdir, root' "." "" ""
@@ -255,4 +256,9 @@ test_expect_success 'go to /foo' 'cd /foo'
 
 test_vars 'auto gitdir, root' "/" "" ""
 
+test_expect_success 'cleanup root' '
+	rm -rf /.git /refs /objects /info /hooks /branches /foo &&
+	rm -f /HEAD /config /description /expected /ls.expected /me /result
+'
+
 test_done
diff --git a/t/t1509/prepare-chroot.sh b/t/t1509/prepare-chroot.sh
index 6d47e2c..dc997e0 100755
--- a/t/t1509/prepare-chroot.sh
+++ b/t/t1509/prepare-chroot.sh
@@ -43,7 +43,7 @@ rsync --exclude-from t/t1509/excludes -Ha . "$R$(pwd)"
 # env might slip through, see test-lib.sh, unset.*PERL_PATH
 sed 's|^PERL_PATH=.*|PERL_PATH=/bin/true|' GIT-BUILD-OPTIONS > "$R$(pwd)/GIT-BUILD-OPTIONS"
 for cmd in git $BB;do 
-	ldd $cmd | grep '/' | sed 's,.*\s\(/[^ ]*\).*,\1,' | while read i; do
+	ldd $cmd | sed -n '/\//s,.*\s\(/[^ ]*\).*,\1,p' | while read i; do
 		mkdir -p "$R$(dirname $i)"
 		cp "$i" "$R/$i"
 	done
diff --git a/t/t1510-repo-setup.sh b/t/t1510-repo-setup.sh
index 9974457..591505a 100755
--- a/t/t1510-repo-setup.sh
+++ b/t/t1510-repo-setup.sh
@@ -43,6 +43,7 @@ A few rules for repo setup:
 # This test heavily relies on the standard error of nested function calls.
 test_untraceable=UnfortunatelyYes
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 here=$(pwd)
@@ -79,7 +80,7 @@ setup_repo () {
 	name=$1 worktreecfg=$2 gitfile=$3 barecfg=$4 &&
 	sane_unset GIT_DIR GIT_WORK_TREE &&
 
-	git init "$name" &&
+	git -c init.defaultBranch=initial init "$name" &&
 	maybe_config "$name/.git/config" core.worktree "$worktreecfg" &&
 	maybe_config "$name/.git/config" core.bare "$barecfg" &&
 	mkdir -p "$name/sub/sub" &&
diff --git a/t/t1511-rev-parse-caret.sh b/t/t1511-rev-parse-caret.sh
index e0a49a6..6ecfed8 100755
--- a/t/t1511-rev-parse-caret.sh
+++ b/t/t1511-rev-parse-caret.sh
@@ -2,6 +2,9 @@
 
 test_description='tests for ref^{stuff}'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -15,7 +18,7 @@ test_expect_success 'setup' '
 	git commit -m Initial &&
 	git tag -a -m commit commit-tag &&
 	git branch ref &&
-	git checkout master &&
+	git checkout main &&
 	echo modified >>a-blob &&
 	git add -u &&
 	git commit -m Modified &&
@@ -73,52 +76,52 @@ test_expect_success 'ref^{tag}' '
 '
 
 test_expect_success 'ref^{/.}' '
-	git rev-parse master >expected &&
-	git rev-parse master^{/.} >actual &&
+	git rev-parse main >expected &&
+	git rev-parse main^{/.} >actual &&
 	test_cmp expected actual
 '
 
 test_expect_success 'ref^{/non-existent}' '
-	test_must_fail git rev-parse master^{/non-existent}
+	test_must_fail git rev-parse main^{/non-existent}
 '
 
 test_expect_success 'ref^{/Initial}' '
 	git rev-parse ref >expected &&
-	git rev-parse master^{/Initial} >actual &&
+	git rev-parse main^{/Initial} >actual &&
 	test_cmp expected actual
 '
 
 test_expect_success 'ref^{/!Exp}' '
-	test_must_fail git rev-parse master^{/!Exp}
+	test_must_fail git rev-parse main^{/!Exp}
 '
 
 test_expect_success 'ref^{/!}' '
-	test_must_fail git rev-parse master^{/!}
+	test_must_fail git rev-parse main^{/!}
 '
 
 test_expect_success 'ref^{/!!Exp}' '
 	git rev-parse expref >expected &&
-	git rev-parse master^{/!!Exp} >actual &&
+	git rev-parse main^{/!!Exp} >actual &&
 	test_cmp expected actual
 '
 
 test_expect_success 'ref^{/!-}' '
-	test_must_fail git rev-parse master^{/!-}
+	test_must_fail git rev-parse main^{/!-}
 '
 
 test_expect_success 'ref^{/!-.}' '
-	test_must_fail git rev-parse master^{/!-.}
+	test_must_fail git rev-parse main^{/!-.}
 '
 
 test_expect_success 'ref^{/!-non-existent}' '
-	git rev-parse master >expected &&
-	git rev-parse master^{/!-non-existent} >actual &&
+	git rev-parse main >expected &&
+	git rev-parse main^{/!-non-existent} >actual &&
 	test_cmp expected actual
 '
 
 test_expect_success 'ref^{/!-Changed}' '
 	git rev-parse expref >expected &&
-	git rev-parse master^{/!-Changed} >actual &&
+	git rev-parse main^{/!-Changed} >actual &&
 	test_cmp expected actual
 '
 
diff --git a/t/t1512-rev-parse-disambiguation.sh b/t/t1512-rev-parse-disambiguation.sh
index 18fa6cf..70f1e0a 100755
--- a/t/t1512-rev-parse-disambiguation.sh
+++ b/t/t1512-rev-parse-disambiguation.sh
@@ -20,8 +20,92 @@ one tagged as v1.0.0.  They all have one regular file each.
 
 '
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
+test_cmp_failed_rev_parse () {
+	dir=$1
+	rev=$2
+
+	cat >expect &&
+	test_must_fail git -C "$dir" rev-parse "$rev" 2>actual.raw &&
+	sed "s/\($rev\)[0-9a-f]*/\1.../" <actual.raw >actual &&
+	test_cmp expect actual
+}
+
+test_expect_success 'ambiguous blob output' '
+	git init --bare blob.prefix &&
+	(
+		cd blob.prefix &&
+
+		# Both start with "dead..", under both SHA-1 and SHA-256
+		echo brocdnra | git hash-object -w --stdin &&
+		echo brigddsv | git hash-object -w --stdin &&
+
+		# Both start with "beef.."
+		echo 1agllotbh | git hash-object -w --stdin &&
+		echo 1bbfctrkc | git hash-object -w --stdin
+	) &&
+
+	test_must_fail git -C blob.prefix rev-parse dead &&
+	test_cmp_failed_rev_parse blob.prefix beef <<-\EOF
+	error: short object ID beef... is ambiguous
+	hint: The candidates are:
+	hint:   beef... blob
+	hint:   beef... blob
+	fatal: ambiguous argument '\''beef...'\'': unknown revision or path not in the working tree.
+	Use '\''--'\'' to separate paths from revisions, like this:
+	'\''git <command> [<revision>...] -- [<file>...]'\''
+	EOF
+'
+
+test_expect_success 'ambiguous loose bad object parsed as OBJ_BAD' '
+	git init --bare blob.bad &&
+	(
+		cd blob.bad &&
+
+		# Both have the prefix "bad0"
+		echo xyzfaowcoh | git hash-object -t bad -w --stdin --literally &&
+		echo xyzhjpyvwl | git hash-object -t bad -w --stdin --literally
+	) &&
+
+	test_cmp_failed_rev_parse blob.bad bad0 <<-\EOF
+	error: short object ID bad0... is ambiguous
+	fatal: invalid object type
+	EOF
+'
+
+test_expect_success POSIXPERM 'ambigous zlib corrupt loose blob' '
+	git init --bare blob.corrupt &&
+	(
+		cd blob.corrupt &&
+
+		# Both have the prefix "cafe"
+		echo bnkxmdwz | git hash-object -w --stdin &&
+		oid=$(echo bmwsjxzi | git hash-object -w --stdin) &&
+
+		oidf=objects/$(test_oid_to_path "$oid") &&
+		chmod 755 $oidf &&
+		echo broken >$oidf
+	) &&
+
+	test_cmp_failed_rev_parse blob.corrupt cafe <<-\EOF
+	error: short object ID cafe... is ambiguous
+	error: inflate: data stream error (incorrect header check)
+	error: unable to unpack cafe... header
+	error: inflate: data stream error (incorrect header check)
+	error: unable to unpack cafe... header
+	hint: The candidates are:
+	hint:   cafe... [bad object]
+	hint:   cafe... blob
+	fatal: ambiguous argument '\''cafe...'\'': unknown revision or path not in the working tree.
+	Use '\''--'\'' to separate paths from revisions, like this:
+	'\''git <command> [<revision>...] -- [<file>...]'\''
+	EOF
+'
+
 if ! test_have_prereq SHA1
 then
 	skip_all='not using SHA-1 for objects'
@@ -31,10 +115,7 @@ fi
 test_expect_success 'blob and tree' '
 	test_tick &&
 	(
-		for i in 0 1 2 3 4 5 6 7 8 9
-		do
-			echo $i
-		done &&
+		test_write_lines 0 1 2 3 4 5 6 7 8 9 &&
 		echo &&
 		echo b1rwzyc3
 	) >a0blgqsjc &&
@@ -48,7 +129,7 @@ test_expect_success 'blob and tree' '
 
 test_expect_success 'warn ambiguity when no candidate matches type hint' '
 	test_must_fail git rev-parse --verify 000000000^{commit} 2>actual &&
-	test_i18ngrep "short SHA1 000000000 is ambiguous" actual
+	test_grep "short object ID 000000000 is ambiguous" actual
 '
 
 test_expect_success 'disambiguate tree-ish' '
@@ -201,10 +282,7 @@ test_expect_success 'more history' '
 	git checkout v1.0.0^0 &&
 	git mv a0blgqsjc f5518nwu &&
 
-	for i in h62xsjeu j08bekfvt kg7xflhm
-	do
-		echo $i
-	done >>f5518nwu &&
+	test_write_lines h62xsjeu j08bekfvt kg7xflhm >>f5518nwu &&
 	git add f5518nwu &&
 
 	test_tick &&
@@ -212,7 +290,7 @@ test_expect_success 'more history' '
 	side=$(git rev-parse HEAD) &&
 
 	# commit 000000000066
-	git checkout master &&
+	git checkout main &&
 
 	# If you use recursive, merge will fail and you will need to
 	# clean up a0blgqsjc as well.  If you use resolve, merge will
@@ -311,39 +389,39 @@ test_expect_success 'ambiguous short sha1 ref' '
 	grep "refname.*${REF}.*ambiguous" err
 '
 
-test_expect_success C_LOCALE_OUTPUT 'ambiguity errors are not repeated (raw)' '
+test_expect_success 'ambiguity errors are not repeated (raw)' '
 	test_must_fail git rev-parse 00000 2>stderr &&
 	grep "is ambiguous" stderr >errors &&
 	test_line_count = 1 errors
 '
 
-test_expect_success C_LOCALE_OUTPUT 'ambiguity errors are not repeated (treeish)' '
+test_expect_success 'ambiguity errors are not repeated (treeish)' '
 	test_must_fail git rev-parse 00000:foo 2>stderr &&
 	grep "is ambiguous" stderr >errors &&
 	test_line_count = 1 errors
 '
 
-test_expect_success C_LOCALE_OUTPUT 'ambiguity errors are not repeated (peel)' '
+test_expect_success 'ambiguity errors are not repeated (peel)' '
 	test_must_fail git rev-parse 00000^{commit} 2>stderr &&
 	grep "is ambiguous" stderr >errors &&
 	test_line_count = 1 errors
 '
 
-test_expect_success C_LOCALE_OUTPUT 'ambiguity hints' '
+test_expect_success 'ambiguity hints' '
 	test_must_fail git rev-parse 000000000 2>stderr &&
 	grep ^hint: stderr >hints &&
 	# 16 candidates, plus one intro line
 	test_line_count = 17 hints
 '
 
-test_expect_success C_LOCALE_OUTPUT 'ambiguity hints respect type' '
+test_expect_success 'ambiguity hints respect type' '
 	test_must_fail git rev-parse 000000000^{commit} 2>stderr &&
 	grep ^hint: stderr >hints &&
 	# 5 commits, 1 tag (which is a committish), plus intro line
 	test_line_count = 7 hints
 '
 
-test_expect_success C_LOCALE_OUTPUT 'failed type-selector still shows hint' '
+test_expect_success 'failed type-selector still shows hint' '
 	# these two blobs share the same prefix "ee3d", but neither
 	# will pass for a commit
 	echo 851 | git hash-object --stdin -w &&
@@ -367,7 +445,7 @@ test_expect_success 'core.disambiguate does not override context' '
 		git -c core.disambiguate=committish rev-parse $sha1^{tree}
 '
 
-test_expect_success C_LOCALE_OUTPUT 'ambiguous commits are printed by type first, then hash order' '
+test_expect_success 'ambiguous commits are printed by type first, then hash order' '
 	test_must_fail git rev-parse 0000 2>stderr &&
 	grep ^hint: stderr >hints &&
 	grep 0000 hints >objects &&
@@ -384,7 +462,7 @@ test_expect_success C_LOCALE_OUTPUT 'ambiguous commits are printed by type first
 	do
 		grep $type objects >$type.objects &&
 		sort $type.objects >$type.objects.sorted &&
-		test_cmp $type.objects.sorted $type.objects
+		test_cmp $type.objects.sorted $type.objects || return 1
 	done
 '
 
@@ -392,10 +470,10 @@ test_expect_success 'cat-file --batch and --batch-check show ambiguous' '
 	echo "0000 ambiguous" >expect &&
 	echo 0000 | git cat-file --batch-check >actual 2>err &&
 	test_cmp expect actual &&
-	test_i18ngrep hint: err &&
+	test_grep hint: err &&
 	echo 0000 | git cat-file --batch >actual 2>err &&
 	test_cmp expect actual &&
-	test_i18ngrep hint: err
+	test_grep hint: err
 '
 
 test_done
diff --git a/t/t1513-rev-parse-prefix.sh b/t/t1513-rev-parse-prefix.sh
index 87ec3ae..ba43387 100755
--- a/t/t1513-rev-parse-prefix.sh
+++ b/t/t1513-rev-parse-prefix.sh
@@ -2,6 +2,10 @@
 
 test_description='Tests for rev-parse --prefix'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -76,9 +80,9 @@ test_expect_success 'disambiguate path with valid prefix' '
 '
 
 test_expect_success 'file and refs with prefix' '
-	git rev-parse --prefix sub1/ master file1 >actual &&
+	git rev-parse --prefix sub1/ main file1 >actual &&
 	cat <<-EOF >expected &&
-	$(git rev-parse master)
+	$(git rev-parse main)
 	sub1/file1
 	EOF
 	test_cmp expected actual
diff --git a/t/t1514-rev-parse-push.sh b/t/t1514-rev-parse-push.sh
index 788cc91..a835a19 100755
--- a/t/t1514-rev-parse-push.sh
+++ b/t/t1514-rev-parse-push.sh
@@ -1,6 +1,10 @@
 #!/bin/sh
 
 test_description='test <branch>@{push} syntax'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 resolve () {
@@ -16,24 +20,24 @@ test_expect_success 'setup' '
 	git remote add other other.git &&
 	test_commit base &&
 	git push origin HEAD &&
-	git branch --set-upstream-to=origin/master master &&
-	git branch --track topic origin/master &&
+	git branch --set-upstream-to=origin/main main &&
+	git branch --track topic origin/main &&
 	git push origin topic &&
 	git push other topic
 '
 
 test_expect_success '@{push} with default=nothing' '
 	test_config push.default nothing &&
-	test_must_fail git rev-parse master@{push} &&
-	test_must_fail git rev-parse master@{PUSH} &&
-	test_must_fail git rev-parse master@{PuSH}
+	test_must_fail git rev-parse main@{push} &&
+	test_must_fail git rev-parse main@{PUSH} &&
+	test_must_fail git rev-parse main@{PuSH}
 '
 
 test_expect_success '@{push} with default=simple' '
 	test_config push.default simple &&
-	resolve master@{push} refs/remotes/origin/master &&
-	resolve master@{PUSH} refs/remotes/origin/master &&
-	resolve master@{pUSh} refs/remotes/origin/master
+	resolve main@{push} refs/remotes/origin/main &&
+	resolve main@{PUSH} refs/remotes/origin/main &&
+	resolve main@{pUSh} refs/remotes/origin/main
 '
 
 test_expect_success 'triangular @{push} fails with default=simple' '
diff --git a/t/t1515-rev-parse-outside-repo.sh b/t/t1515-rev-parse-outside-repo.sh
index 3ec2971..cdb26a3 100755
--- a/t/t1515-rev-parse-outside-repo.sh
+++ b/t/t1515-rev-parse-outside-repo.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='check that certain rev-parse options work outside repo'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'set up non-repo directory' '
diff --git a/t/t1600-index.sh b/t/t1600-index.sh
index b7c31aa..62e7fd1 100755
--- a/t/t1600-index.sh
+++ b/t/t1600-index.sh
@@ -2,8 +2,11 @@
 
 test_description='index file specific tests'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
+sane_unset GIT_TEST_SPLIT_INDEX
+
 test_expect_success 'setup' '
 	echo 1 >a
 '
@@ -13,12 +16,13 @@ test_expect_success 'bogus GIT_INDEX_VERSION issues warning' '
 		rm -f .git/index &&
 		GIT_INDEX_VERSION=2bogus &&
 		export GIT_INDEX_VERSION &&
-		git add a 2>&1 | sed "s/[0-9]//" >actual.err &&
+		git add a 2>err &&
+		sed "s/[0-9]//" err >actual.err &&
 		sed -e "s/ Z$/ /" <<-\EOF >expect.err &&
 			warning: GIT_INDEX_VERSION set, but the value is invalid.
 			Using version Z
 		EOF
-		test_i18ncmp expect.err actual.err
+		test_cmp expect.err actual.err
 	)
 '
 
@@ -27,12 +31,13 @@ test_expect_success 'out of bounds GIT_INDEX_VERSION issues warning' '
 		rm -f .git/index &&
 		GIT_INDEX_VERSION=1 &&
 		export GIT_INDEX_VERSION &&
-		git add a 2>&1 | sed "s/[0-9]//" >actual.err &&
+		git add a 2>err &&
+		sed "s/[0-9]//" err >actual.err &&
 		sed -e "s/ Z$/ /" <<-\EOF >expect.err &&
 			warning: GIT_INDEX_VERSION set, but the value is invalid.
 			Using version Z
 		EOF
-		test_i18ncmp expect.err actual.err
+		test_cmp expect.err actual.err
 	)
 '
 
@@ -50,15 +55,47 @@ test_expect_success 'out of bounds index.version issues warning' '
 		sane_unset GIT_INDEX_VERSION &&
 		rm -f .git/index &&
 		git config --add index.version 1 &&
-		git add a 2>&1 | sed "s/[0-9]//" >actual.err &&
+		git add a 2>err &&
+		sed "s/[0-9]//" err >actual.err &&
 		sed -e "s/ Z$/ /" <<-\EOF >expect.err &&
 			warning: index.version set, but the value is invalid.
 			Using version Z
 		EOF
-		test_i18ncmp expect.err actual.err
+		test_cmp expect.err actual.err
 	)
 '
 
+test_expect_success 'index.skipHash config option' '
+	rm -f .git/index &&
+	git -c index.skipHash=true add a &&
+	test_trailing_hash .git/index >hash &&
+	echo $(test_oid zero) >expect &&
+	test_cmp expect hash &&
+	git fsck &&
+
+	rm -f .git/index &&
+	git -c feature.manyFiles=true add a &&
+	test_trailing_hash .git/index >hash &&
+	cmp expect hash &&
+
+	rm -f .git/index &&
+	git -c feature.manyFiles=true \
+	    -c index.skipHash=false add a &&
+	test_trailing_hash .git/index >hash &&
+	! cmp expect hash &&
+
+	test_commit start &&
+	git -c protocol.file.allow=always submodule add ./ sub &&
+	git config index.skipHash false &&
+	git -C sub config index.skipHash true &&
+	rm -f .git/modules/sub/index &&
+	>sub/file &&
+	git -C sub add a &&
+	test_trailing_hash .git/modules/sub/index >hash &&
+	test_cmp expect hash &&
+	git -C sub fsck
+'
+
 test_index_version () {
 	INDEX_VERSION_CONFIG=$1 &&
 	FEATURE_MANY_FILES=$2 &&
@@ -79,9 +116,9 @@ test_index_version () {
 		else
 			unset GIT_INDEX_VERSION
 		fi &&
-		git add a 2>&1 &&
+		git add a &&
 		echo $EXPECTED_OUTPUT_VERSION >expect &&
-		test-tool index-version <.git/index >actual &&
+		git update-index --show-index-version >actual &&
 		test_cmp expect actual
 	)
 }
diff --git a/t/t1700-split-index.sh b/t/t1700-split-index.sh
index 12a5568..a7b7263 100755
--- a/t/t1700-split-index.sh
+++ b/t/t1700-split-index.sh
@@ -2,6 +2,9 @@
 
 test_description='split index mode tests'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 # We need total control of index splitting here
@@ -40,15 +43,15 @@ test_expect_success 'enable split index' '
 	git config splitIndex.maxPercentChange 100 &&
 	git update-index --split-index &&
 	test-tool dump-split-index .git/index >actual &&
-	indexversion=$(test-tool index-version <.git/index) &&
+	indexversion=$(git update-index --show-index-version) &&
 
 	# NEEDSWORK: Stop hard-coding checksums.
 	if test "$indexversion" = "4"
 	then
-		own=$(test_oid own_v4)
+		own=$(test_oid own_v4) &&
 		base=$(test_oid base_v4)
 	else
-		own=$(test_oid own_v3)
+		own=$(test_oid own_v3) &&
 		base=$(test_oid base_v3)
 	fi &&
 
@@ -496,7 +499,7 @@ test_expect_success 'do not refresh null base index' '
 		test_commit initial &&
 		git checkout -b side-branch &&
 		test_commit extra &&
-		git checkout master &&
+		git checkout main &&
 		git update-index --split-index &&
 		test_commit more &&
 		# must not write a new shareindex, or we wont catch the problem
@@ -507,4 +510,38 @@ test_expect_success 'do not refresh null base index' '
 	)
 '
 
+test_expect_success 'reading split index at alternate location' '
+	git init reading-alternate-location &&
+	(
+		cd reading-alternate-location &&
+		>file-in-alternate &&
+		git update-index --split-index --add file-in-alternate
+	) &&
+	echo file-in-alternate >expect &&
+
+	# Should be able to find the shared index both right next to
+	# the specified split index file ...
+	GIT_INDEX_FILE=./reading-alternate-location/.git/index \
+	git ls-files --cached >actual &&
+	test_cmp expect actual &&
+
+	# ... and, for backwards compatibility, in the current GIT_DIR
+	# as well.
+	mv -v ./reading-alternate-location/.git/sharedindex.* .git &&
+	GIT_INDEX_FILE=./reading-alternate-location/.git/index \
+	git ls-files --cached >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'GIT_TEST_SPLIT_INDEX works' '
+	git init git-test-split-index &&
+	(
+		cd git-test-split-index &&
+		>file &&
+		GIT_TEST_SPLIT_INDEX=1 git update-index --add file &&
+		ls -l .git/sharedindex.* >actual &&
+		test_line_count = 1 actual
+	)
+'
+
 test_done
diff --git a/t/t1701-racy-split-index.sh b/t/t1701-racy-split-index.sh
index 5dc221e..d8fa489 100755
--- a/t/t1701-racy-split-index.sh
+++ b/t/t1701-racy-split-index.sh
@@ -5,6 +5,7 @@
 
 test_description='racy split index'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
diff --git a/t/t1800-hook.sh b/t/t1800-hook.sh
new file mode 100755
index 0000000..8b0234c
--- /dev/null
+++ b/t/t1800-hook.sh
@@ -0,0 +1,188 @@
+#!/bin/sh
+
+test_description='git-hook command'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-terminal.sh
+
+test_expect_success 'git hook usage' '
+	test_expect_code 129 git hook &&
+	test_expect_code 129 git hook run &&
+	test_expect_code 129 git hook run -h &&
+	test_expect_code 129 git hook run --unknown 2>err &&
+	grep "unknown option" err
+'
+
+test_expect_success 'git hook run: nonexistent hook' '
+	cat >stderr.expect <<-\EOF &&
+	error: cannot find a hook named test-hook
+	EOF
+	test_expect_code 1 git hook run test-hook 2>stderr.actual &&
+	test_cmp stderr.expect stderr.actual
+'
+
+test_expect_success 'git hook run: nonexistent hook with --ignore-missing' '
+	git hook run --ignore-missing does-not-exist 2>stderr.actual &&
+	test_must_be_empty stderr.actual
+'
+
+test_expect_success 'git hook run: basic' '
+	test_hook test-hook <<-EOF &&
+	echo Test hook
+	EOF
+
+	cat >expect <<-\EOF &&
+	Test hook
+	EOF
+	git hook run test-hook 2>actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'git hook run: stdout and stderr both write to our stderr' '
+	test_hook test-hook <<-EOF &&
+	echo >&1 Will end up on stderr
+	echo >&2 Will end up on stderr
+	EOF
+
+	cat >stderr.expect <<-\EOF &&
+	Will end up on stderr
+	Will end up on stderr
+	EOF
+	git hook run test-hook >stdout.actual 2>stderr.actual &&
+	test_cmp stderr.expect stderr.actual &&
+	test_must_be_empty stdout.actual
+'
+
+for code in 1 2 128 129
+do
+	test_expect_success "git hook run: exit code $code is passed along" '
+		test_hook test-hook <<-EOF &&
+		exit $code
+		EOF
+
+		test_expect_code $code git hook run test-hook
+	'
+done
+
+test_expect_success 'git hook run arg u ments without -- is not allowed' '
+	test_expect_code 129 git hook run test-hook arg u ments
+'
+
+test_expect_success 'git hook run -- pass arguments' '
+	test_hook test-hook <<-\EOF &&
+	echo $1
+	echo $2
+	EOF
+
+	cat >expect <<-EOF &&
+	arg
+	u ments
+	EOF
+
+	git hook run test-hook -- arg "u ments" 2>actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'git hook run -- out-of-repo runs excluded' '
+	test_hook test-hook <<-EOF &&
+	echo Test hook
+	EOF
+
+	nongit test_must_fail git hook run test-hook
+'
+
+test_expect_success 'git -c core.hooksPath=<PATH> hook run' '
+	mkdir my-hooks &&
+	write_script my-hooks/test-hook <<-\EOF &&
+	echo Hook ran $1
+	EOF
+
+	cat >expect <<-\EOF &&
+	Test hook
+	Hook ran one
+	Hook ran two
+	Hook ran three
+	Hook ran four
+	EOF
+
+	test_hook test-hook <<-EOF &&
+	echo Test hook
+	EOF
+
+	# Test various ways of specifying the path. See also
+	# t1350-config-hooks-path.sh
+	>actual &&
+	git hook run test-hook -- ignored 2>>actual &&
+	git -c core.hooksPath=my-hooks hook run test-hook -- one 2>>actual &&
+	git -c core.hooksPath=my-hooks/ hook run test-hook -- two 2>>actual &&
+	git -c core.hooksPath="$PWD/my-hooks" hook run test-hook -- three 2>>actual &&
+	git -c core.hooksPath="$PWD/my-hooks/" hook run test-hook -- four 2>>actual &&
+	test_cmp expect actual
+'
+
+test_hook_tty () {
+	cat >expect <<-\EOF
+	STDOUT TTY
+	STDERR TTY
+	EOF
+
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+
+	test_commit -C repo A &&
+	test_commit -C repo B &&
+	git -C repo reset --soft HEAD^ &&
+
+	test_hook -C repo pre-commit <<-EOF &&
+	test -t 1 && echo STDOUT TTY >>actual || echo STDOUT NO TTY >>actual &&
+	test -t 2 && echo STDERR TTY >>actual || echo STDERR NO TTY >>actual
+	EOF
+
+	test_terminal git -C repo "$@" &&
+	test_cmp expect repo/actual
+}
+
+test_expect_success TTY 'git hook run: stdout and stderr are connected to a TTY' '
+	test_hook_tty hook run pre-commit
+'
+
+test_expect_success TTY 'git commit: stdout and stderr are connected to a TTY' '
+	test_hook_tty commit -m"B.new"
+'
+
+test_expect_success 'git hook run a hook with a bad shebang' '
+	test_when_finished "rm -rf bad-hooks" &&
+	mkdir bad-hooks &&
+	write_script bad-hooks/test-hook "/bad/path/no/spaces" </dev/null &&
+
+	test_expect_code 1 git \
+		-c core.hooksPath=bad-hooks \
+		hook run test-hook >out 2>err &&
+	test_must_be_empty out &&
+
+	# TODO: We should emit the same (or at least a more similar)
+	# error on MINGW (essentially Git for Windows) and all other
+	# platforms.. See the OS-specific code in start_command()
+	grep -E "^(error|fatal): cannot (exec|spawn) .*bad-hooks/test-hook" err
+'
+
+test_expect_success 'stdin to hooks' '
+	write_script .git/hooks/test-hook <<-\EOF &&
+	echo BEGIN stdin
+	cat
+	echo END stdin
+	EOF
+
+	cat >expect <<-EOF &&
+	BEGIN stdin
+	hello
+	END stdin
+	EOF
+
+	echo hello >input &&
+	git hook run --to-stdin=input test-hook 2>actual &&
+	test_cmp expect actual
+'
+
+test_done
diff --git a/t/t2000-conflict-when-checking-files-out.sh b/t/t2000-conflict-when-checking-files-out.sh
index f18616a..79fc97f 100755
--- a/t/t2000-conflict-when-checking-files-out.sh
+++ b/t/t2000-conflict-when-checking-files-out.sh
@@ -21,6 +21,7 @@ test_description='git conflicts when checking files out test.'
 # path1 is occupied by a non-directory.  With "-f" flag, it should remove
 # the conflicting paths and succeed.
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 show_files() {
diff --git a/t/t2002-checkout-cache-u.sh b/t/t2002-checkout-cache-u.sh
index 70361c8..fc95cf9 100755
--- a/t/t2002-checkout-cache-u.sh
+++ b/t/t2002-checkout-cache-u.sh
@@ -8,6 +8,7 @@ test_description='git checkout-index -u test.
 With -u flag, git checkout-index internally runs the equivalent of
 git update-index --refresh on the checked out entry.'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success \
diff --git a/t/t2003-checkout-cache-mkdir.sh b/t/t2003-checkout-cache-mkdir.sh
index ff163cf..f0fd441 100755
--- a/t/t2003-checkout-cache-mkdir.sh
+++ b/t/t2003-checkout-cache-mkdir.sh
@@ -10,6 +10,7 @@ also verifies that such leading path may contain symlinks, unlike
 the GIT controlled paths.
 '
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
diff --git a/t/t2004-checkout-cache-temp.sh b/t/t2004-checkout-cache-temp.sh
index a12afe9..98e818f 100755
--- a/t/t2004-checkout-cache-temp.sh
+++ b/t/t2004-checkout-cache-temp.sh
@@ -8,6 +8,7 @@ test_description='git checkout-index --temp test.
 With --temp flag, git checkout-index writes to temporary merge files
 rather than the tracked path.'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -56,7 +57,7 @@ test_expect_success 'checkout all stage 0 to temporary files' '
 		test $(grep $f actual | cut "-d	" -f2) = $f &&
 		p=$(grep $f actual | cut "-d	" -f1) &&
 		test -f $p &&
-		test $(cat $p) = tree1$f
+		test $(cat $p) = tree1$f || return 1
 	done
 '
 
@@ -84,13 +85,21 @@ test_expect_success 'checkout all stage 2 to temporary files' '
 		test $(grep $f actual | cut "-d	" -f2) = $f &&
 		p=$(grep $f actual | cut "-d	" -f1) &&
 		test -f $p &&
-		test $(cat $p) = tree2$f
+		test $(cat $p) = tree2$f || return 1
 	done
 '
 
+test_expect_success 'checkout all stages of unknown path' '
+	rm -f path* .merge_* actual &&
+	test_must_fail git checkout-index --stage=all --temp \
+		-- does-not-exist 2>stderr &&
+	test_grep not.in.the.cache stderr
+'
+
 test_expect_success 'checkout all stages/one file to nothing' '
 	rm -f path* .merge_* actual &&
-	git checkout-index --stage=all --temp -- path0 >actual &&
+	git checkout-index --stage=all --temp -- path0 >actual 2>stderr &&
+	test_must_be_empty stderr &&
 	test_line_count = 0 actual
 '
 
@@ -108,6 +117,26 @@ test_expect_success 'checkout all stages/one file to temporary files' '
 	test $(cat $s3) = tree3path1)
 '
 
+test_expect_success '--stage=all implies --temp' '
+	rm -f path* .merge_* actual &&
+	git checkout-index --stage=all -- path1 &&
+	test_path_is_missing path1
+'
+
+test_expect_success 'overriding --stage=all resets implied --temp' '
+	rm -f path* .merge_* actual &&
+	git checkout-index --stage=all --stage=2 -- path1 &&
+	echo tree2path1 >expect &&
+	test_cmp expect path1
+'
+
+test_expect_success '--stage=all --no-temp is rejected' '
+	rm -f path* .merge_* actual &&
+	test_must_fail git checkout-index --stage=all --no-temp -- path1 2>err &&
+	grep -v "already exists" err &&
+	grep "options .--stage=all. and .--no-temp. cannot be used together" err
+'
+
 test_expect_success 'checkout some stages/one file to temporary files' '
 	rm -f path* .merge_* actual &&
 	git checkout-index --stage=all --temp -- path2 >actual &&
diff --git a/t/t2005-checkout-index-symlinks.sh b/t/t2005-checkout-index-symlinks.sh
index 9fa5610..67d18cf 100755
--- a/t/t2005-checkout-index-symlinks.sh
+++ b/t/t2005-checkout-index-symlinks.sh
@@ -8,6 +8,7 @@ test_description='git checkout-index on filesystem w/o symlinks test.
 This tests that git checkout-index creates a symbolic link as a plain
 file if core.symlinks is false.'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success \
@@ -21,8 +22,10 @@ test_expect_success \
 git checkout-index symlink &&
 test -f symlink'
 
-test_expect_success \
-'the file must be the blob we added during the setup' '
-test "$(git hash-object -t blob symlink)" = $l'
+test_expect_success 'the file must be the blob we added during the setup' '
+	echo "$l" >expect &&
+	git hash-object -t blob symlink >actual &&
+	test_cmp expect actual
+'
 
 test_done
diff --git a/t/t2006-checkout-index-basic.sh b/t/t2006-checkout-index-basic.sh
index 57cbdfe..570ba38 100755
--- a/t/t2006-checkout-index-basic.sh
+++ b/t/t2006-checkout-index-basic.sh
@@ -3,11 +3,12 @@
 test_description='basic checkout-index tests
 '
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'checkout-index --gobbledegook' '
 	test_expect_code 129 git checkout-index --gobbledegook 2>err &&
-	test_i18ngrep "[Uu]sage" err
+	test_grep "[Uu]sage" err
 '
 
 test_expect_success 'checkout-index -h in broken repository' '
@@ -18,7 +19,86 @@ test_expect_success 'checkout-index -h in broken repository' '
 		>.git/index &&
 		test_expect_code 129 git checkout-index -h >usage 2>&1
 	) &&
-	test_i18ngrep "[Uu]sage" broken/usage
+	test_grep "[Uu]sage" broken/usage
+'
+
+test_expect_success 'checkout-index reports errors (cmdline)' '
+	test_must_fail git checkout-index -- does-not-exist 2>stderr &&
+	test_grep not.in.the.cache stderr
+'
+
+test_expect_success 'checkout-index reports errors (stdin)' '
+	echo does-not-exist |
+	test_must_fail git checkout-index --stdin 2>stderr &&
+	test_grep not.in.the.cache stderr
+'
+for mode in 'case' 'utf-8'
+do
+	case "$mode" in
+	case)	dir='A' symlink='a' mode_prereq='CASE_INSENSITIVE_FS' ;;
+	utf-8)
+		dir=$(printf "\141\314\210") symlink=$(printf "\303\244")
+		mode_prereq='UTF8_NFD_TO_NFC' ;;
+	esac
+
+	test_expect_success SYMLINKS,$mode_prereq \
+	"checkout-index with $mode-collision don't write to the wrong place" '
+		git init $mode-collision &&
+		(
+			cd $mode-collision &&
+			mkdir target-dir &&
+
+			empty_obj_hex=$(git hash-object -w --stdin </dev/null) &&
+			symlink_hex=$(printf "%s" "$PWD/target-dir" | git hash-object -w --stdin) &&
+
+			cat >objs <<-EOF &&
+			100644 blob ${empty_obj_hex}	${dir}/x
+			100644 blob ${empty_obj_hex}	${dir}/y
+			100644 blob ${empty_obj_hex}	${dir}/z
+			120000 blob ${symlink_hex}	${symlink}
+			EOF
+
+			git update-index --index-info <objs &&
+
+			# Note: the order is important here to exercise the
+			# case where the file at ${dir} has its type changed by
+			# the time Git tries to check out ${dir}/z.
+			#
+			# Also, we use core.precomposeUnicode=false because we
+			# want Git to treat the UTF-8 paths transparently on
+			# Mac OS, matching what is in the index.
+			#
+			git -c core.precomposeUnicode=false checkout-index -f \
+				${dir}/x ${dir}/y ${symlink} ${dir}/z &&
+
+			# Should not create ${dir}/z at ${symlink}/z
+			test_path_is_missing target-dir/z
+
+		)
+	'
+done
+
+test_expect_success 'checkout-index --temp correctly reports error on missing blobs' '
+	test_when_finished git reset --hard &&
+	missing_blob=$(echo "no such blob here" | git hash-object --stdin) &&
+	cat >objs <<-EOF &&
+	100644 $missing_blob	file
+	120000 $missing_blob	symlink
+	EOF
+	git update-index --index-info <objs &&
+
+	test_must_fail git checkout-index --temp symlink file 2>stderr &&
+	test_grep "unable to read sha1 file of file ($missing_blob)" stderr &&
+	test_grep "unable to read sha1 file of symlink ($missing_blob)" stderr
+'
+
+test_expect_success 'checkout-index --temp correctly reports error for submodules' '
+	git init sub &&
+	test_commit -C sub file &&
+	git submodule add ./sub &&
+	git commit -m sub &&
+	test_must_fail git checkout-index --temp sub 2>stderr &&
+	test_grep "cannot create temporary submodule sub" stderr
 '
 
 test_done
diff --git a/t/t2007-checkout-symlink.sh b/t/t2007-checkout-symlink.sh
index fc9aad5..bd9e9e7 100755
--- a/t/t2007-checkout-symlink.sh
+++ b/t/t2007-checkout-symlink.sh
@@ -4,6 +4,10 @@
 
 test_description='git checkout to switch between branches with symlink<->dir'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -12,14 +16,14 @@ test_expect_success setup '
 	echo hello >frotz/filfre &&
 	git add frotz/filfre &&
 	test_tick &&
-	git commit -m "master has file frotz/filfre" &&
+	git commit -m "main has file frotz/filfre" &&
 
 	git branch side &&
 
 	echo goodbye >nitfol &&
 	git add nitfol &&
 	test_tick &&
-	git commit -m "master adds file nitfol" &&
+	git commit -m "main adds file nitfol" &&
 
 	git checkout side &&
 
@@ -34,13 +38,13 @@ test_expect_success setup '
 
 test_expect_success 'switch from symlink to dir' '
 
-	git checkout master
+	git checkout main
 
 '
 
-test_expect_success 'Remove temporary directories & switch to master' '
+test_expect_success 'Remove temporary directories & switch to main' '
 	rm -fr frotz xyzzy nitfol &&
-	git checkout -f master
+	git checkout -f main
 '
 
 test_expect_success 'switch from dir to symlink' '
diff --git a/t/t2008-checkout-subdir.sh b/t/t2008-checkout-subdir.sh
index eadb943..8a518a4 100755
--- a/t/t2008-checkout-subdir.sh
+++ b/t/t2008-checkout-subdir.sh
@@ -4,6 +4,7 @@
 
 test_description='git checkout from subdirectories'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
diff --git a/t/t2009-checkout-statinfo.sh b/t/t2009-checkout-statinfo.sh
index f3c2152..71195dd 100755
--- a/t/t2009-checkout-statinfo.sh
+++ b/t/t2009-checkout-statinfo.sh
@@ -2,6 +2,10 @@
 
 test_description='checkout should leave clean stat info'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -21,13 +25,13 @@ test_expect_success 'branch switching' '
 	git reset --hard &&
 	test "$(git diff-files --raw)" = "" &&
 
-	git checkout master &&
+	git checkout main &&
 	test "$(git diff-files --raw)" = "" &&
 
 	git checkout side &&
 	test "$(git diff-files --raw)" = "" &&
 
-	git checkout master &&
+	git checkout main &&
 	test "$(git diff-files --raw)" = ""
 
 '
@@ -37,13 +41,13 @@ test_expect_success 'path checkout' '
 	git reset --hard &&
 	test "$(git diff-files --raw)" = "" &&
 
-	git checkout master world &&
+	git checkout main world &&
 	test "$(git diff-files --raw)" = "" &&
 
 	git checkout side world &&
 	test "$(git diff-files --raw)" = "" &&
 
-	git checkout master world &&
+	git checkout main world &&
 	test "$(git diff-files --raw)" = ""
 
 '
diff --git a/t/t2010-checkout-ambiguous.sh b/t/t2010-checkout-ambiguous.sh
index 2e47fe0..82c3bfe 100755
--- a/t/t2010-checkout-ambiguous.sh
+++ b/t/t2010-checkout-ambiguous.sh
@@ -2,6 +2,10 @@
 
 test_description='checkout and pathspecs/refspecs ambiguities'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -17,7 +21,7 @@ test_expect_success 'reference must be a tree' '
 '
 
 test_expect_success 'branch switching' '
-	test "refs/heads/master" = "$(git symbolic-ref HEAD)" &&
+	test "refs/heads/main" = "$(git symbolic-ref HEAD)" &&
 	git checkout world -- &&
 	test "refs/heads/world" = "$(git symbolic-ref HEAD)"
 '
@@ -57,9 +61,9 @@ test_expect_success 'disambiguate checking out from a tree-ish' '
 '
 
 test_expect_success 'accurate error message with more than one ref' '
-	test_must_fail git checkout HEAD master -- 2>actual &&
-	test_i18ngrep 2 actual &&
-	test_i18ngrep "one reference expected, 2 given" actual
+	test_must_fail git checkout HEAD main -- 2>actual &&
+	test_grep 2 actual &&
+	test_grep "one reference expected, 2 given" actual
 '
 
 test_done
diff --git a/t/t2011-checkout-invalid-head.sh b/t/t2011-checkout-invalid-head.sh
index 0e8d56a..04f53b1 100755
--- a/t/t2011-checkout-invalid-head.sh
+++ b/t/t2011-checkout-invalid-head.sh
@@ -2,6 +2,10 @@
 
 test_description='checkout switching away from an invalid branch'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -11,38 +15,35 @@ test_expect_success 'setup' '
 '
 
 test_expect_success 'checkout should not start branch from a tree' '
-	test_must_fail git checkout -b newbranch master^{tree}
+	test_must_fail git checkout -b newbranch main^{tree}
 '
 
-test_expect_success 'checkout master from invalid HEAD' '
+test_expect_success REFFILES 'checkout main from invalid HEAD' '
 	echo $ZERO_OID >.git/HEAD &&
-	git checkout master --
+	git checkout main --
 '
 
-test_expect_success 'checkout notices failure to lock HEAD' '
+test_expect_success REFFILES 'checkout notices failure to lock HEAD' '
 	test_when_finished "rm -f .git/HEAD.lock" &&
 	>.git/HEAD.lock &&
 	test_must_fail git checkout -b other
 '
 
 test_expect_success 'create ref directory/file conflict scenario' '
-	git update-ref refs/heads/outer/inner master &&
-
-	# do not rely on symbolic-ref to get a known state,
-	# as it may use the same code we are testing
+	git update-ref refs/heads/outer/inner main &&
 	reset_to_df () {
-		echo "ref: refs/heads/outer" >.git/HEAD
+		git symbolic-ref HEAD refs/heads/outer
 	}
 '
 
 test_expect_success 'checkout away from d/f HEAD (unpacked, to branch)' '
 	reset_to_df &&
-	git checkout master
+	git checkout main
 '
 
 test_expect_success 'checkout away from d/f HEAD (unpacked, to detached)' '
 	reset_to_df &&
-	git checkout --detach master
+	git checkout --detach main
 '
 
 test_expect_success 'pack refs' '
@@ -51,11 +52,11 @@ test_expect_success 'pack refs' '
 
 test_expect_success 'checkout away from d/f HEAD (packed, to branch)' '
 	reset_to_df &&
-	git checkout master
+	git checkout main
 '
 
 test_expect_success 'checkout away from d/f HEAD (packed, to detached)' '
 	reset_to_df &&
-	git checkout --detach master
+	git checkout --detach main
 '
 test_done
diff --git a/t/t2012-checkout-last.sh b/t/t2012-checkout-last.sh
index e7ba8c5..4b6372f 100755
--- a/t/t2012-checkout-last.sh
+++ b/t/t2012-checkout-last.sh
@@ -2,16 +2,16 @@
 
 test_description='checkout can switch to last branch and merge base'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
-	echo hello >world &&
-	git add world &&
-	git commit -m initial &&
+	test_commit initial world hello &&
 	git branch other &&
-	echo "hello again" >>world &&
-	git add world &&
-	git commit -m second
+	test_commit --append second world "hello again"
 '
 
 test_expect_success '"checkout -" does not work initially' '
@@ -22,14 +22,20 @@ test_expect_success 'first branch switch' '
 	git checkout other
 '
 
+test_cmp_symbolic_HEAD_ref () {
+	echo refs/heads/"$1" >expect &&
+	git symbolic-ref HEAD >actual &&
+	test_cmp expect actual
+}
+
 test_expect_success '"checkout -" switches back' '
 	git checkout - &&
-	test "z$(git symbolic-ref HEAD)" = "zrefs/heads/master"
+	test_cmp_symbolic_HEAD_ref main
 '
 
 test_expect_success '"checkout -" switches forth' '
 	git checkout - &&
-	test "z$(git symbolic-ref HEAD)" = "zrefs/heads/other"
+	test_cmp_symbolic_HEAD_ref other
 '
 
 test_expect_success 'detach HEAD' '
@@ -38,116 +44,127 @@ test_expect_success 'detach HEAD' '
 
 test_expect_success '"checkout -" attaches again' '
 	git checkout - &&
-	test "z$(git symbolic-ref HEAD)" = "zrefs/heads/other"
+	test_cmp_symbolic_HEAD_ref other
 '
 
 test_expect_success '"checkout -" detaches again' '
 	git checkout - &&
-	test "z$(git rev-parse HEAD)" = "z$(git rev-parse other)" &&
+
+	git rev-parse other >expect &&
+	git rev-parse HEAD >actual &&
+	test_cmp expect actual &&
+
 	test_must_fail git symbolic-ref HEAD
 '
 
 test_expect_success 'more switches' '
 	for i in 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
 	do
-		git checkout -b branch$i
+		git checkout -b branch$i || return 1
 	done
 '
 
 more_switches () {
 	for i in 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
 	do
-		git checkout branch$i
+		git checkout branch$i || return 1
 	done
 }
 
 test_expect_success 'switch to the last' '
 	more_switches &&
 	git checkout @{-1} &&
-	test "z$(git symbolic-ref HEAD)" = "zrefs/heads/branch2"
+	test_cmp_symbolic_HEAD_ref branch2
 '
 
 test_expect_success 'switch to second from the last' '
 	more_switches &&
 	git checkout @{-2} &&
-	test "z$(git symbolic-ref HEAD)" = "zrefs/heads/branch3"
+	test_cmp_symbolic_HEAD_ref branch3
 '
 
 test_expect_success 'switch to third from the last' '
 	more_switches &&
 	git checkout @{-3} &&
-	test "z$(git symbolic-ref HEAD)" = "zrefs/heads/branch4"
+	test_cmp_symbolic_HEAD_ref branch4
 '
 
 test_expect_success 'switch to fourth from the last' '
 	more_switches &&
 	git checkout @{-4} &&
-	test "z$(git symbolic-ref HEAD)" = "zrefs/heads/branch5"
+	test_cmp_symbolic_HEAD_ref branch5
 '
 
 test_expect_success 'switch to twelfth from the last' '
 	more_switches &&
 	git checkout @{-12} &&
-	test "z$(git symbolic-ref HEAD)" = "zrefs/heads/branch13"
+	test_cmp_symbolic_HEAD_ref branch13
 '
 
 test_expect_success 'merge base test setup' '
 	git checkout -b another other &&
-	echo "hello again" >>world &&
-	git add world &&
-	git commit -m third
+	test_commit --append third world "hello again"
 '
 
-test_expect_success 'another...master' '
+test_expect_success 'another...main' '
 	git checkout another &&
-	git checkout another...master &&
-	test "z$(git rev-parse --verify HEAD)" = "z$(git rev-parse --verify master^)"
+	git checkout another...main &&
+
+	git rev-parse --verify main^ >expect &&
+	git rev-parse --verify HEAD >actual &&
+	test_cmp expect actual
 '
 
-test_expect_success '...master' '
+test_expect_success '...main' '
 	git checkout another &&
-	git checkout ...master &&
-	test "z$(git rev-parse --verify HEAD)" = "z$(git rev-parse --verify master^)"
+	git checkout ...main &&
+
+	git rev-parse --verify main^ >expect &&
+	git rev-parse --verify HEAD >actual &&
+	test_cmp expect actual
 '
 
-test_expect_success 'master...' '
+test_expect_success 'main...' '
 	git checkout another &&
-	git checkout master... &&
-	test "z$(git rev-parse --verify HEAD)" = "z$(git rev-parse --verify master^)"
+	git checkout main... &&
+
+	git rev-parse --verify main^ >expect &&
+	git rev-parse --verify HEAD >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success '"checkout -" works after a rebase A' '
-	git checkout master &&
+	git checkout main &&
 	git checkout other &&
-	git rebase master &&
+	git rebase main &&
 	git checkout - &&
-	test "z$(git symbolic-ref HEAD)" = "zrefs/heads/master"
+	test_cmp_symbolic_HEAD_ref main
 '
 
 test_expect_success '"checkout -" works after a rebase A B' '
-	git branch moodle master~1 &&
-	git checkout master &&
+	git branch moodle main~1 &&
+	git checkout main &&
 	git checkout other &&
-	git rebase master moodle &&
+	git rebase main moodle &&
 	git checkout - &&
-	test "z$(git symbolic-ref HEAD)" = "zrefs/heads/master"
+	test_cmp_symbolic_HEAD_ref main
 '
 
 test_expect_success '"checkout -" works after a rebase -i A' '
-	git checkout master &&
+	git checkout main &&
 	git checkout other &&
-	git rebase -i master &&
+	git rebase -i main &&
 	git checkout - &&
-	test "z$(git symbolic-ref HEAD)" = "zrefs/heads/master"
+	test_cmp_symbolic_HEAD_ref main
 '
 
 test_expect_success '"checkout -" works after a rebase -i A B' '
-	git branch foodle master~1 &&
-	git checkout master &&
+	git branch foodle main~1 &&
+	git checkout main &&
 	git checkout other &&
-	git rebase master foodle &&
+	git rebase main foodle &&
 	git checkout - &&
-	test "z$(git symbolic-ref HEAD)" = "zrefs/heads/master"
+	test_cmp_symbolic_HEAD_ref main
 '
 
 test_done
diff --git a/t/t2014-checkout-switch.sh b/t/t2014-checkout-switch.sh
index ccfb147..c138bdd 100755
--- a/t/t2014-checkout-switch.sh
+++ b/t/t2014-checkout-switch.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='Peter MacMillan'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
diff --git a/t/t2015-checkout-unborn.sh b/t/t2015-checkout-unborn.sh
index 37bdced..fb0e138 100755
--- a/t/t2015-checkout-unborn.sh
+++ b/t/t2015-checkout-unborn.sh
@@ -1,17 +1,22 @@
 #!/bin/sh
 
 test_description='checkout from unborn branch'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
 	mkdir parent &&
-	(cd parent &&
-	 git init &&
-	 echo content >file &&
-	 git add file &&
-	 git commit -m base
+	(
+		cd parent &&
+		git init &&
+		echo content >file &&
+		git add file &&
+		git commit -m base
 	) &&
-	git fetch parent master:origin
+	git fetch parent main:origin
 '
 
 test_expect_success 'checkout from unborn preserves untracked files' '
diff --git a/t/t2016-checkout-patch.sh b/t/t2016-checkout-patch.sh
index 47aeb0b..c4f9bf0 100755
--- a/t/t2016-checkout-patch.sh
+++ b/t/t2016-checkout-patch.sh
@@ -4,7 +4,7 @@ test_description='git checkout --patch'
 
 . ./lib-patch-mode.sh
 
-test_expect_success PERL 'setup' '
+test_expect_success 'setup' '
 	mkdir dir &&
 	echo parent > dir/foo &&
 	echo dummy > bar &&
@@ -18,55 +18,68 @@ test_expect_success PERL 'setup' '
 
 # note: bar sorts before dir/foo, so the first 'n' is always to skip 'bar'
 
-test_expect_success PERL 'saying "n" does nothing' '
+test_expect_success 'saying "n" does nothing' '
 	set_and_save_state dir/foo work head &&
 	test_write_lines n n | git checkout -p &&
 	verify_saved_state bar &&
 	verify_saved_state dir/foo
 '
 
-test_expect_success PERL 'git checkout -p' '
+test_expect_success 'git checkout -p' '
 	test_write_lines n y | git checkout -p &&
 	verify_saved_state bar &&
 	verify_state dir/foo head head
 '
 
-test_expect_success PERL 'git checkout -p with staged changes' '
+test_expect_success 'git checkout -p with staged changes' '
 	set_state dir/foo work index &&
 	test_write_lines n y | git checkout -p &&
 	verify_saved_state bar &&
 	verify_state dir/foo index index
 '
 
-test_expect_success PERL 'git checkout -p HEAD with NO staged changes: abort' '
-	set_and_save_state dir/foo work head &&
-	test_write_lines n y n | git checkout -p HEAD &&
-	verify_saved_state bar &&
-	verify_saved_state dir/foo
-'
-
-test_expect_success PERL 'git checkout -p HEAD with NO staged changes: apply' '
-	test_write_lines n y y | git checkout -p HEAD &&
-	verify_saved_state bar &&
-	verify_state dir/foo head head
-'
-
-test_expect_success PERL 'git checkout -p HEAD with change already staged' '
-	set_state dir/foo index index &&
+for opt in "HEAD" "@"
+do
+	test_expect_success "git checkout -p $opt with NO staged changes: abort" '
+		set_and_save_state dir/foo work head &&
+		test_write_lines n y n | git checkout -p $opt >output &&
+		verify_saved_state bar &&
+		verify_saved_state dir/foo &&
+		test_grep "Discard" output
+	'
+
+	test_expect_success "git checkout -p $opt with NO staged changes: apply" '
+		test_write_lines n y y | git checkout -p $opt >output &&
+		verify_saved_state bar &&
+		verify_state dir/foo head head &&
+		test_grep "Discard" output
+	'
+
+	test_expect_success "git checkout -p $opt with change already staged" '
+		set_state dir/foo index index &&
+		# the third n is to get out in case it mistakenly does not apply
+		test_write_lines n y n | git checkout -p $opt >output &&
+		verify_saved_state bar &&
+		verify_state dir/foo head head &&
+		test_grep "Discard" output
+	'
+done
+
+test_expect_success 'git checkout -p HEAD^...' '
 	# the third n is to get out in case it mistakenly does not apply
-	test_write_lines n y n | git checkout -p HEAD &&
+	test_write_lines n y n | git checkout -p HEAD^... &&
 	verify_saved_state bar &&
-	verify_state dir/foo head head
+	verify_state dir/foo parent parent
 '
 
-test_expect_success PERL 'git checkout -p HEAD^' '
+test_expect_success 'git checkout -p HEAD^' '
 	# the third n is to get out in case it mistakenly does not apply
 	test_write_lines n y n | git checkout -p HEAD^ &&
 	verify_saved_state bar &&
 	verify_state dir/foo parent parent
 '
 
-test_expect_success PERL 'git checkout -p handles deletion' '
+test_expect_success 'git checkout -p handles deletion' '
 	set_state dir/foo work index &&
 	rm dir/foo &&
 	test_write_lines n y | git checkout -p &&
@@ -79,28 +92,28 @@ test_expect_success PERL 'git checkout -p handles deletion' '
 # dir/foo.  There's always an extra 'n' to reject edits to dir/foo in
 # the failure case (and thus get out of the loop).
 
-test_expect_success PERL 'path limiting works: dir' '
+test_expect_success 'path limiting works: dir' '
 	set_state dir/foo work head &&
 	test_write_lines y n | git checkout -p dir &&
 	verify_saved_state bar &&
 	verify_state dir/foo head head
 '
 
-test_expect_success PERL 'path limiting works: -- dir' '
+test_expect_success 'path limiting works: -- dir' '
 	set_state dir/foo work head &&
 	test_write_lines y n | git checkout -p -- dir &&
 	verify_saved_state bar &&
 	verify_state dir/foo head head
 '
 
-test_expect_success PERL 'path limiting works: HEAD^ -- dir' '
+test_expect_success 'path limiting works: HEAD^ -- dir' '
 	# the third n is to get out in case it mistakenly does not apply
 	test_write_lines y n n | git checkout -p HEAD^ -- dir &&
 	verify_saved_state bar &&
 	verify_state dir/foo parent parent
 '
 
-test_expect_success PERL 'path limiting works: foo inside dir' '
+test_expect_success 'path limiting works: foo inside dir' '
 	set_state dir/foo work head &&
 	# the third n is to get out in case it mistakenly does not apply
 	test_write_lines y n n | (cd dir && git checkout -p foo) &&
@@ -108,8 +121,13 @@ test_expect_success PERL 'path limiting works: foo inside dir' '
 	verify_state dir/foo head head
 '
 
-test_expect_success PERL 'none of this moved HEAD' '
+test_expect_success 'none of this moved HEAD' '
 	verify_saved_head
 '
 
+test_expect_success 'empty tree can be handled' '
+	test_when_finished "git reset --hard" &&
+	git checkout -p $(test_oid empty_tree) --
+'
+
 test_done
diff --git a/t/t2017-checkout-orphan.sh b/t/t2017-checkout-orphan.sh
index 655f278..a5c7358 100755
--- a/t/t2017-checkout-orphan.sh
+++ b/t/t2017-checkout-orphan.sh
@@ -7,6 +7,10 @@ test_description='git checkout --orphan
 
 Main Tests for --orphan functionality.'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 TEST_FILE=foo
@@ -29,43 +33,52 @@ test_expect_success '--orphan creates a new orphan branch from HEAD' '
 	test_tick &&
 	git commit -m "Third Commit" &&
 	test_must_fail git rev-parse --verify HEAD^ &&
-	git diff-tree --quiet master alpha
+	git diff-tree --quiet main alpha
 '
 
 test_expect_success '--orphan creates a new orphan branch from <start_point>' '
-	git checkout master &&
-	git checkout --orphan beta master^ &&
+	git checkout main &&
+	git checkout --orphan beta main^ &&
 	test_must_fail git rev-parse --verify HEAD &&
 	test "refs/heads/beta" = "$(git symbolic-ref HEAD)" &&
 	test_tick &&
 	git commit -m "Fourth Commit" &&
 	test_must_fail git rev-parse --verify HEAD^ &&
-	git diff-tree --quiet master^ beta
+	git diff-tree --quiet main^ beta
 '
 
 test_expect_success '--orphan must be rejected with -b' '
-	git checkout master &&
+	git checkout main &&
 	test_must_fail git checkout --orphan new -b newer &&
-	test refs/heads/master = "$(git symbolic-ref HEAD)"
+	test refs/heads/main = "$(git symbolic-ref HEAD)"
 '
 
 test_expect_success '--orphan must be rejected with -t' '
-	git checkout master &&
-	test_must_fail git checkout --orphan new -t master &&
-	test refs/heads/master = "$(git symbolic-ref HEAD)"
+	git checkout main &&
+	test_must_fail git checkout --orphan new -t main &&
+	test refs/heads/main = "$(git symbolic-ref HEAD)"
 '
 
 test_expect_success '--orphan ignores branch.autosetupmerge' '
-	git checkout master &&
+	git checkout main &&
 	git config branch.autosetupmerge always &&
 	git checkout --orphan gamma &&
-	test -z "$(git config branch.gamma.merge)" &&
+	test_cmp_config "" --default "" branch.gamma.merge &&
 	test refs/heads/gamma = "$(git symbolic-ref HEAD)" &&
+	test_must_fail git rev-parse --verify HEAD^ &&
+	git checkout main &&
+	git config branch.autosetupmerge inherit &&
+	git checkout --orphan eta &&
+	test_cmp_config "" --default "" branch.eta.merge &&
+	test_cmp_config "" --default "" branch.eta.remote &&
+	echo refs/heads/eta >expected &&
+	git symbolic-ref HEAD >actual &&
+	test_cmp expected actual &&
 	test_must_fail git rev-parse --verify HEAD^
 '
 
 test_expect_success '--orphan makes reflog by default' '
-	git checkout master &&
+	git checkout main &&
 	git config --unset core.logAllRefUpdates &&
 	git checkout --orphan delta &&
 	test_must_fail git rev-parse --verify delta@{0} &&
@@ -74,7 +87,7 @@ test_expect_success '--orphan makes reflog by default' '
 '
 
 test_expect_success '--orphan does not make reflog when core.logAllRefUpdates = false' '
-	git checkout master &&
+	git checkout main &&
 	git config core.logAllRefUpdates false &&
 	git checkout --orphan epsilon &&
 	test_must_fail git rev-parse --verify epsilon@{0} &&
@@ -83,7 +96,7 @@ test_expect_success '--orphan does not make reflog when core.logAllRefUpdates =
 '
 
 test_expect_success '--orphan with -l makes reflog when core.logAllRefUpdates = false' '
-	git checkout master &&
+	git checkout main &&
 	git checkout -l --orphan zeta &&
 	test_must_fail git rev-parse --verify zeta@{0} &&
 	git commit -m Zeta &&
@@ -91,33 +104,33 @@ test_expect_success '--orphan with -l makes reflog when core.logAllRefUpdates =
 '
 
 test_expect_success 'giving up --orphan not committed when -l and core.logAllRefUpdates = false deletes reflog' '
-	git checkout master &&
+	git checkout main &&
 	git checkout -l --orphan eta &&
 	test_must_fail git rev-parse --verify eta@{0} &&
-	git checkout master &&
+	git checkout main &&
 	test_must_fail git rev-parse --verify eta@{0}
 '
 
 test_expect_success '--orphan is rejected with an existing name' '
-	git checkout master &&
-	test_must_fail git checkout --orphan master &&
-	test refs/heads/master = "$(git symbolic-ref HEAD)"
+	git checkout main &&
+	test_must_fail git checkout --orphan main &&
+	test refs/heads/main = "$(git symbolic-ref HEAD)"
 '
 
 test_expect_success '--orphan refuses to switch if a merge is needed' '
-	git checkout master &&
+	git checkout main &&
 	git reset --hard &&
 	echo local >>"$TEST_FILE" &&
 	cat "$TEST_FILE" >"$TEST_FILE.saved" &&
-	test_must_fail git checkout --orphan new master^ &&
-	test refs/heads/master = "$(git symbolic-ref HEAD)" &&
+	test_must_fail git checkout --orphan new main^ &&
+	test refs/heads/main = "$(git symbolic-ref HEAD)" &&
 	test_cmp "$TEST_FILE" "$TEST_FILE.saved" &&
 	git diff-index --quiet --cached HEAD &&
 	git reset --hard
 '
 
 test_expect_success 'cannot --detach on an unborn branch' '
-	git checkout master &&
+	git checkout main &&
 	git checkout --orphan new &&
 	test_must_fail git checkout --detach
 '
diff --git a/t/t2018-checkout-branch.sh b/t/t2018-checkout-branch.sh
index 5f761bc..43551cc 100755
--- a/t/t2018-checkout-branch.sh
+++ b/t/t2018-checkout-branch.sh
@@ -2,6 +2,8 @@
 
 test_description='checkout'
 
+TEST_CREATE_REPO_NO_TEMPLATE=1
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # Arguments: [!] <branch> <oid> [<checkout options>]
@@ -85,6 +87,19 @@ test_expect_success 'setup' '
 	git branch -m branch1
 '
 
+test_expect_success 'checkout a branch without refs/heads/* prefix' '
+	git clone --no-tags . repo-odd-prefix &&
+	(
+		cd repo-odd-prefix &&
+
+		origin=$(git symbolic-ref refs/remotes/origin/HEAD) &&
+		git symbolic-ref refs/heads/a-branch "$origin" &&
+
+		git checkout -f a-branch &&
+		git checkout -f a-branch
+	)
+'
+
 test_expect_success 'checkout -b to a new branch, set to HEAD' '
 	test_when_finished "
 		git checkout branch1 &&
@@ -148,9 +163,9 @@ test_expect_success 'checkout -b to an existing branch fails' '
 test_expect_success 'checkout -b to @{-1} fails with the right branch name' '
 	git checkout branch1 &&
 	git checkout branch2 &&
-	echo  >expect "fatal: A branch named '\''branch1'\'' already exists." &&
+	echo  >expect "fatal: a branch named '\''branch1'\'' already exists" &&
 	test_must_fail git checkout -b @{-1} 2>actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 test_expect_success 'checkout -B to an existing branch resets branch to HEAD' '
@@ -244,11 +259,12 @@ test_expect_success 'checkout -b to a new branch preserves mergeable changes des
 		git checkout branch1-scratch &&
 		test_might_fail git branch -D branch3 &&
 		git config core.sparseCheckout false &&
-		rm .git/info/sparse-checkout" &&
+		rm -rf .git/info" &&
 
 	test_commit file2 &&
 
 	echo stuff >>file1 &&
+	mkdir .git/info &&
 	echo file2 >.git/info/sparse-checkout &&
 	git config core.sparseCheckout true &&
 
@@ -262,12 +278,12 @@ test_expect_success 'checkout -b to a new branch preserves mergeable changes des
 
 test_expect_success 'checkout -b rejects an invalid start point' '
 	test_must_fail git checkout -b branch4 file1 2>err &&
-	test_i18ngrep "is not a commit" err
+	test_grep "is not a commit" err
 '
 
 test_expect_success 'checkout -b rejects an extra path argument' '
 	test_must_fail git checkout -b branch5 branch1 file1 2>err &&
-	test_i18ngrep "Cannot update paths and switch to branch" err
+	test_grep "Cannot update paths and switch to branch" err
 '
 
 test_done
diff --git a/t/t2019-checkout-ambiguous-ref.sh b/t/t2019-checkout-ambiguous-ref.sh
index b99d519..c67261e 100755
--- a/t/t2019-checkout-ambiguous-ref.sh
+++ b/t/t2019-checkout-ambiguous-ref.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='checkout handling of ambiguous (branch/tag) refs'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup ambiguous refs' '
@@ -14,7 +16,7 @@ test_expect_success 'setup ambiguous refs' '
 '
 
 test_expect_success 'checkout ambiguous ref succeeds' '
-	git checkout ambiguity >stdout 2>stderr
+	git checkout ambiguity 2>stderr
 '
 
 test_expect_success 'checkout produces ambiguity warning' '
@@ -30,12 +32,12 @@ test_expect_success 'checkout chooses branch over tag' '
 '
 
 test_expect_success 'checkout reports switch to branch' '
-	test_i18ngrep "Switched to branch" stderr &&
-	test_i18ngrep ! "^HEAD is now at" stderr
+	test_grep "Switched to branch" stderr &&
+	test_grep ! "^HEAD is now at" stderr
 '
 
 test_expect_success 'checkout vague ref succeeds' '
-	git checkout vagueness >stdout 2>stderr &&
+	git checkout vagueness 2>stderr &&
 	test_set_prereq VAGUENESS_SUCCESS
 '
 
@@ -52,8 +54,8 @@ test_expect_success VAGUENESS_SUCCESS 'checkout chooses branch over tag' '
 '
 
 test_expect_success VAGUENESS_SUCCESS 'checkout reports switch to branch' '
-	test_i18ngrep "Switched to branch" stderr &&
-	test_i18ngrep ! "^HEAD is now at" stderr
+	test_grep "Switched to branch" stderr &&
+	test_grep ! "^HEAD is now at" stderr
 '
 
 test_done
diff --git a/t/t2020-checkout-detach.sh b/t/t2020-checkout-detach.sh
index b748db9..8d90d02 100755
--- a/t/t2020-checkout-detach.sh
+++ b/t/t2020-checkout-detach.sh
@@ -1,6 +1,10 @@
 #!/bin/sh
 
 test_description='checkout into detached HEAD state'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 check_detached () {
@@ -13,16 +17,16 @@ check_not_detached () {
 
 PREV_HEAD_DESC='Previous HEAD position was'
 check_orphan_warning() {
-	test_i18ngrep "you are leaving $2 behind" "$1" &&
-	test_i18ngrep ! "$PREV_HEAD_DESC" "$1"
+	test_grep "you are leaving $2 behind" "$1" &&
+	test_grep ! "$PREV_HEAD_DESC" "$1"
 }
 check_no_orphan_warning() {
-	test_i18ngrep ! "you are leaving .* commit.*behind" "$1" &&
-	test_i18ngrep "$PREV_HEAD_DESC" "$1"
+	test_grep ! "you are leaving .* commit.*behind" "$1" &&
+	test_grep "$PREV_HEAD_DESC" "$1"
 }
 
 reset () {
-	git checkout master &&
+	git checkout main &&
 	check_not_detached
 }
 
@@ -41,6 +45,18 @@ test_expect_success 'checkout branch does not detach' '
 	check_not_detached
 '
 
+for opt in "HEAD" "@"
+do
+	test_expect_success "checkout $opt no-op/don't detach" '
+		reset &&
+		cat .git/HEAD >expect &&
+		git checkout $opt &&
+		cat .git/HEAD >actual &&
+		check_not_detached &&
+		test_cmp expect actual
+	'
+done
+
 test_expect_success 'checkout tag detaches' '
 	reset &&
 	git checkout tag &&
@@ -85,7 +101,7 @@ test_expect_success 'checkout --detach errors out for non-commit' '
 
 test_expect_success 'checkout --detach errors out for extra argument' '
 	reset &&
-	git checkout master &&
+	git checkout main &&
 	test_must_fail git checkout --detach tag one.t &&
 	check_not_detached
 '
@@ -113,7 +129,7 @@ test_expect_success 'checkout warns on orphan commits' '
 	echo new content >orphan &&
 	git commit -a -m orphan2 &&
 	orphan2=$(git rev-parse HEAD) &&
-	git checkout master 2>stderr
+	git checkout main 2>stderr
 '
 
 test_expect_success 'checkout warns on orphan commits: output' '
@@ -132,7 +148,7 @@ test_expect_success 'checkout warns orphaning 1 of 2 commits: output' '
 test_expect_success 'checkout does not warn leaving ref tip' '
 	reset &&
 	git checkout --detach two &&
-	git checkout master 2>stderr
+	git checkout main 2>stderr
 '
 
 test_expect_success 'checkout does not warn leaving ref tip' '
@@ -142,7 +158,7 @@ test_expect_success 'checkout does not warn leaving ref tip' '
 test_expect_success 'checkout does not warn leaving reachable commit' '
 	reset &&
 	git checkout --detach HEAD^ &&
-	git checkout master 2>stderr
+	git checkout main 2>stderr
 '
 
 test_expect_success 'checkout does not warn leaving reachable commit' '
@@ -150,17 +166,20 @@ test_expect_success 'checkout does not warn leaving reachable commit' '
 '
 
 cat >expect <<'EOF'
-Your branch is behind 'master' by 1 commit, and can be fast-forwarded.
+Your branch is behind 'main' by 1 commit, and can be fast-forwarded.
   (use "git pull" to update your local branch)
 EOF
 test_expect_success 'tracking count is accurate after orphan check' '
 	reset &&
-	git branch child master^ &&
+	git branch child main^ &&
 	git config branch.child.remote . &&
-	git config branch.child.merge refs/heads/master &&
+	git config branch.child.merge refs/heads/main &&
 	git checkout child^ &&
 	git checkout child >stdout &&
-	test_i18ncmp expect stdout
+	test_cmp expect stdout &&
+
+	git checkout --detach child >stdout &&
+	test_grep ! "can be fast-forwarded\." stdout
 '
 
 test_expect_success 'no advice given for explicit detached head state' '
@@ -189,9 +208,9 @@ test_expect_success 'no advice given for explicit detached head state' '
 # Detached HEAD tests for GIT_PRINT_SHA1_ELLIPSIS (new format)
 test_expect_success 'describe_detached_head prints no SHA-1 ellipsis when not asked to' "
 
-	commit=$(git rev-parse --short=12 master^) &&
-	commit2=$(git rev-parse --short=12 master~2) &&
-	commit3=$(git rev-parse --short=12 master~3) &&
+	commit=$(git rev-parse --short=12 main^) &&
+	commit2=$(git rev-parse --short=12 main~2) &&
+	commit3=$(git rev-parse --short=12 main~3) &&
 
 	# The first detach operation is more chatty than the following ones.
 	cat >1st_detach <<-EOF &&
@@ -234,15 +253,15 @@ test_expect_success 'describe_detached_head prints no SHA-1 ellipsis when not as
 	sane_unset GIT_PRINT_SHA1_ELLIPSIS &&
 	git -c 'core.abbrev=12' checkout HEAD^ >actual 2>&1 &&
 	check_detached &&
-	test_i18ncmp 1st_detach actual &&
+	test_cmp 1st_detach actual &&
 
 	GIT_PRINT_SHA1_ELLIPSIS="no" git -c 'core.abbrev=12' checkout HEAD^ >actual 2>&1 &&
 	check_detached &&
-	test_i18ncmp 2nd_detach actual &&
+	test_cmp 2nd_detach actual &&
 
 	GIT_PRINT_SHA1_ELLIPSIS= git -c 'core.abbrev=12' checkout HEAD^ >actual 2>&1 &&
 	check_detached &&
-	test_i18ncmp 3rd_detach actual &&
+	test_cmp 3rd_detach actual &&
 
 	sane_unset GIT_PRINT_SHA1_ELLIPSIS &&
 
@@ -253,17 +272,17 @@ test_expect_success 'describe_detached_head prints no SHA-1 ellipsis when not as
 	# Make no mention of the env var at all
 	git -c 'core.abbrev=12' checkout HEAD^ >actual 2>&1 &&
 	check_detached &&
-	test_i18ncmp 1st_detach actual &&
+	test_cmp 1st_detach actual &&
 
 	GIT_PRINT_SHA1_ELLIPSIS='nope' &&
 	git -c 'core.abbrev=12' checkout HEAD^ >actual 2>&1 &&
 	check_detached &&
-	test_i18ncmp 2nd_detach actual &&
+	test_cmp 2nd_detach actual &&
 
 	GIT_PRINT_SHA1_ELLIPSIS=nein &&
 	git -c 'core.abbrev=12' checkout HEAD^ >actual 2>&1 &&
 	check_detached &&
-	test_i18ncmp 3rd_detach actual &&
+	test_cmp 3rd_detach actual &&
 
 	true
 "
@@ -271,9 +290,9 @@ test_expect_success 'describe_detached_head prints no SHA-1 ellipsis when not as
 # Detached HEAD tests for GIT_PRINT_SHA1_ELLIPSIS (old format)
 test_expect_success 'describe_detached_head does print SHA-1 ellipsis when asked to' "
 
-	commit=$(git rev-parse --short=12 master^) &&
-	commit2=$(git rev-parse --short=12 master~2) &&
-	commit3=$(git rev-parse --short=12 master~3) &&
+	commit=$(git rev-parse --short=12 main^) &&
+	commit2=$(git rev-parse --short=12 main~2) &&
+	commit3=$(git rev-parse --short=12 main~3) &&
 
 	# The first detach operation is more chatty than the following ones.
 	cat >1st_detach <<-EOF &&
@@ -316,15 +335,15 @@ test_expect_success 'describe_detached_head does print SHA-1 ellipsis when asked
 
 	GIT_PRINT_SHA1_ELLIPSIS=yes git -c 'core.abbrev=12' checkout HEAD^ >actual 2>&1 &&
 	check_detached &&
-	test_i18ncmp 1st_detach actual &&
+	test_cmp 1st_detach actual &&
 
 	GIT_PRINT_SHA1_ELLIPSIS=Yes git -c 'core.abbrev=12' checkout HEAD^ >actual 2>&1 &&
 	check_detached &&
-	test_i18ncmp 2nd_detach actual &&
+	test_cmp 2nd_detach actual &&
 
 	GIT_PRINT_SHA1_ELLIPSIS=YES git -c 'core.abbrev=12' checkout HEAD^ >actual 2>&1 &&
 	check_detached &&
-	test_i18ncmp 3rd_detach actual &&
+	test_cmp 3rd_detach actual &&
 
 	true
 "
diff --git a/t/t2021-checkout-overwrite.sh b/t/t2021-checkout-overwrite.sh
index c2ada7d..ecfacf0 100755
--- a/t/t2021-checkout-overwrite.sh
+++ b/t/t2021-checkout-overwrite.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='checkout must not overwrite an untracked objects'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -51,4 +53,31 @@ test_expect_success SYMLINKS 'the symlink remained' '
 	test -h a/b
 '
 
+test_expect_success 'cleanup after previous symlink tests' '
+	rm a/b
+'
+
+test_expect_success SYMLINKS 'checkout -f must not follow symlinks when removing entries' '
+	git checkout -f start &&
+	mkdir dir &&
+	>dir/f &&
+	git add dir/f &&
+	git commit -m "add dir/f" &&
+	mv dir untracked &&
+	ln -s untracked dir &&
+	git checkout -f HEAD~ &&
+	test_path_is_file untracked/f
+'
+
+test_expect_success 'checkout --overwrite-ignore should succeed if only ignored files in the way' '
+	git checkout -b df_conflict &&
+	test_commit contents some_dir &&
+	git checkout start &&
+	mkdir some_dir &&
+	echo autogenerated information >some_dir/ignore &&
+	echo ignore >.git/info/exclude &&
+	git checkout --overwrite-ignore df_conflict &&
+	test_path_is_file some_dir
+'
+
 test_done
diff --git a/t/t2022-checkout-paths.sh b/t/t2022-checkout-paths.sh
index 6844afa..f1b709d 100755
--- a/t/t2022-checkout-paths.sh
+++ b/t/t2022-checkout-paths.sh
@@ -1,19 +1,23 @@
 #!/bin/sh
 
 test_description='checkout $tree -- $paths'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
 	mkdir dir &&
-	>dir/master &&
+	>dir/main &&
 	echo common >dir/common &&
-	git add dir/master dir/common &&
-	test_tick && git commit -m "master has dir/master" &&
+	git add dir/main dir/common &&
+	test_tick && git commit -m "main has dir/main" &&
 	git checkout -b next &&
-	git mv dir/master dir/next0 &&
+	git mv dir/main dir/next0 &&
 	echo next >dir/next1 &&
 	git add dir &&
-	test_tick && git commit -m "next has dir/next but not dir/master"
+	test_tick && git commit -m "next has dir/next but not dir/main"
 '
 
 test_expect_success 'checking out paths out of a tree does not clobber unrelated paths' '
@@ -26,11 +30,11 @@ test_expect_success 'checking out paths out of a tree does not clobber unrelated
 	echo untracked >expect.next2 &&
 	cat expect.next2 >dir/next2 &&
 
-	git checkout master dir &&
+	git checkout main dir &&
 
 	test_cmp expect.common dir/common &&
-	test_path_is_file dir/master &&
-	git diff --exit-code master dir/master &&
+	test_path_is_file dir/main &&
+	git diff --exit-code main dir/main &&
 
 	test_path_is_missing dir/next0 &&
 	test_cmp expect.next1 dir/next1 &&
@@ -52,11 +56,11 @@ test_expect_success 'do not touch unmerged entries matching $path but not in $tr
 	EOF
 	git update-index --index-info <expect.next0 &&
 
-	git checkout master dir &&
+	git checkout main dir &&
 
 	test_cmp expect.common dir/common &&
-	test_path_is_file dir/master &&
-	git diff --exit-code master dir/master &&
+	test_path_is_file dir/main &&
+	git diff --exit-code main dir/main &&
 	git ls-files -s dir/next0 >actual.next0 &&
 	test_cmp expect.next0 actual.next0
 '
diff --git a/t/t2023-checkout-m.sh b/t/t2023-checkout-m.sh
index fca3f85..81e772f 100755
--- a/t/t2023-checkout-m.sh
+++ b/t/t2023-checkout-m.sh
@@ -4,21 +4,25 @@ test_description='checkout -m -- <conflicted path>
 
 Ensures that checkout -m on a resolved file restores the conflicted file'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
 	test_tick &&
 	test_commit both.txt both.txt initial &&
 	git branch topic &&
-	test_commit modified_in_master both.txt in_master &&
-	test_commit added_in_master each.txt in_master &&
+	test_commit modified_in_main both.txt in_main &&
+	test_commit added_in_main each.txt in_main &&
 	git checkout topic &&
 	test_commit modified_in_topic both.txt in_topic &&
 	test_commit added_in_topic each.txt in_topic
 '
 
-test_expect_success 'git merge master' '
-    test_must_fail git merge master
+test_expect_success 'git merge main' '
+    test_must_fail git merge main
 '
 
 clean_branchnames () {
@@ -61,7 +65,7 @@ test_expect_success 'force checkout a conflict file creates stage zero entry' '
 		git checkout topic &&
 		echo c >a &&
 		C_OBJ=$(git hash-object a) &&
-		git checkout -m master &&
+		git checkout -m main &&
 		test_cmp_rev :1:a $A_OBJ &&
 		test_cmp_rev :2:a $B_OBJ &&
 		test_cmp_rev :3:a $C_OBJ &&
diff --git a/t/t2024-checkout-dwim.sh b/t/t2024-checkout-dwim.sh
index accfa9a..a3b1449 100755
--- a/t/t2024-checkout-dwim.sh
+++ b/t/t2024-checkout-dwim.sh
@@ -29,11 +29,11 @@ status_uno_is_clean () {
 }
 
 test_expect_success 'setup' '
-	test_commit my_master &&
+	test_commit my_main &&
 	git init repo_a &&
 	(
 		cd repo_a &&
-		test_commit a_master &&
+		test_commit a_main &&
 		git checkout -b foo &&
 		test_commit a_foo &&
 		git checkout -b bar &&
@@ -44,7 +44,7 @@ test_expect_success 'setup' '
 	git init repo_b &&
 	(
 		cd repo_b &&
-		test_commit b_master &&
+		test_commit b_main &&
 		git checkout -b foo &&
 		test_commit b_foo &&
 		git checkout -b baz &&
@@ -60,23 +60,23 @@ test_expect_success 'setup' '
 '
 
 test_expect_success 'checkout of non-existing branch fails' '
-	git checkout -B master &&
+	git checkout -B main &&
 	test_might_fail git branch -D xyzzy &&
 
 	test_must_fail git checkout xyzzy &&
 	status_uno_is_clean &&
 	test_must_fail git rev-parse --verify refs/heads/xyzzy &&
-	test_branch master
+	test_branch main
 '
 
 test_expect_success 'checkout of branch from multiple remotes fails #1' '
-	git checkout -B master &&
+	git checkout -B main &&
 	test_might_fail git branch -D foo &&
 
 	test_must_fail git checkout foo &&
 	status_uno_is_clean &&
 	test_must_fail git rev-parse --verify refs/heads/foo &&
-	test_branch master
+	test_branch main
 '
 
 test_expect_success 'when arg matches multiple remotes, do not fallback to interpreting as pathspec' '
@@ -93,37 +93,37 @@ test_expect_success 'when arg matches multiple remotes, do not fallback to inter
 
 	test_must_fail git checkout ambiguous_branch_and_file 2>err &&
 
-	test_i18ngrep "matched multiple (2) remote tracking branches" err &&
+	test_grep "matched multiple (2) remote tracking branches" err &&
 
 	# file must not be altered
 	test_cmp expect ambiguous_branch_and_file
 '
 
 test_expect_success 'checkout of branch from multiple remotes fails with advice' '
-	git checkout -B master &&
+	git checkout -B main &&
 	test_might_fail git branch -D foo &&
 	test_must_fail git checkout foo 2>stderr &&
-	test_branch master &&
+	test_branch main &&
 	status_uno_is_clean &&
-	test_i18ngrep "^hint: " stderr &&
+	test_grep "^hint: " stderr &&
 	test_must_fail git -c advice.checkoutAmbiguousRemoteBranchName=false \
 		checkout foo 2>stderr &&
-	test_branch master &&
+	test_branch main &&
 	status_uno_is_clean &&
-	test_i18ngrep ! "^hint: " stderr
+	test_grep ! "^hint: " stderr
 '
 
-test_expect_success PERL 'checkout -p with multiple remotes does not print advice' '
-	git checkout -B master &&
+test_expect_success 'checkout -p with multiple remotes does not print advice' '
+	git checkout -B main &&
 	test_might_fail git branch -D foo &&
 
 	git checkout -p foo 2>stderr &&
-	test_i18ngrep ! "^hint: " stderr &&
+	test_grep ! "^hint: " stderr &&
 	status_uno_is_clean
 '
 
 test_expect_success 'checkout of branch from multiple remotes succeeds with checkout.defaultRemote #1' '
-	git checkout -B master &&
+	git checkout -B main &&
 	status_uno_is_clean &&
 	test_might_fail git branch -D foo &&
 
@@ -135,7 +135,7 @@ test_expect_success 'checkout of branch from multiple remotes succeeds with chec
 '
 
 test_expect_success 'checkout of branch from a single remote succeeds #1' '
-	git checkout -B master &&
+	git checkout -B main &&
 	test_might_fail git branch -D bar &&
 
 	git checkout bar &&
@@ -146,7 +146,7 @@ test_expect_success 'checkout of branch from a single remote succeeds #1' '
 '
 
 test_expect_success 'checkout of branch from a single remote succeeds #2' '
-	git checkout -B master &&
+	git checkout -B main &&
 	test_might_fail git branch -D baz &&
 
 	git checkout baz &&
@@ -157,22 +157,33 @@ test_expect_success 'checkout of branch from a single remote succeeds #2' '
 '
 
 test_expect_success '--no-guess suppresses branch auto-vivification' '
-	git checkout -B master &&
+	git checkout -B main &&
 	status_uno_is_clean &&
 	test_might_fail git branch -D bar &&
 
 	test_must_fail git checkout --no-guess bar &&
 	test_must_fail git rev-parse --verify refs/heads/bar &&
-	test_branch master
+	test_branch main
+'
+
+test_expect_success 'checkout.guess = false suppresses branch auto-vivification' '
+	git checkout -B main &&
+	status_uno_is_clean &&
+	test_might_fail git branch -D bar &&
+
+	test_config checkout.guess false &&
+	test_must_fail git checkout bar &&
+	test_must_fail git rev-parse --verify refs/heads/bar &&
+	test_branch main
 '
 
 test_expect_success 'setup more remotes with unconventional refspecs' '
-	git checkout -B master &&
+	git checkout -B main &&
 	status_uno_is_clean &&
 	git init repo_c &&
 	(
 		cd repo_c &&
-		test_commit c_master &&
+		test_commit c_main &&
 		git checkout -b bar &&
 		test_commit c_bar &&
 		git checkout -b spam &&
@@ -181,7 +192,7 @@ test_expect_success 'setup more remotes with unconventional refspecs' '
 	git init repo_d &&
 	(
 		cd repo_d &&
-		test_commit d_master &&
+		test_commit d_main &&
 		git checkout -b baz &&
 		test_commit d_baz &&
 		git checkout -b eggs &&
@@ -197,29 +208,29 @@ test_expect_success 'setup more remotes with unconventional refspecs' '
 '
 
 test_expect_success 'checkout of branch from multiple remotes fails #2' '
-	git checkout -B master &&
+	git checkout -B main &&
 	status_uno_is_clean &&
 	test_might_fail git branch -D bar &&
 
 	test_must_fail git checkout bar &&
 	status_uno_is_clean &&
 	test_must_fail git rev-parse --verify refs/heads/bar &&
-	test_branch master
+	test_branch main
 '
 
 test_expect_success 'checkout of branch from multiple remotes fails #3' '
-	git checkout -B master &&
+	git checkout -B main &&
 	status_uno_is_clean &&
 	test_might_fail git branch -D baz &&
 
 	test_must_fail git checkout baz &&
 	status_uno_is_clean &&
 	test_must_fail git rev-parse --verify refs/heads/baz &&
-	test_branch master
+	test_branch main
 '
 
 test_expect_success 'checkout of branch from a single remote succeeds #3' '
-	git checkout -B master &&
+	git checkout -B main &&
 	status_uno_is_clean &&
 	test_might_fail git branch -D spam &&
 
@@ -231,7 +242,7 @@ test_expect_success 'checkout of branch from a single remote succeeds #3' '
 '
 
 test_expect_success 'checkout of branch from a single remote succeeds #4' '
-	git checkout -B master &&
+	git checkout -B main &&
 	status_uno_is_clean &&
 	test_might_fail git branch -D eggs &&
 
@@ -243,7 +254,7 @@ test_expect_success 'checkout of branch from a single remote succeeds #4' '
 '
 
 test_expect_success 'checkout of branch with a file having the same name fails' '
-	git checkout -B master &&
+	git checkout -B main &&
 	status_uno_is_clean &&
 	test_might_fail git branch -D spam &&
 
@@ -251,11 +262,11 @@ test_expect_success 'checkout of branch with a file having the same name fails'
 	test_must_fail git checkout spam &&
 	status_uno_is_clean &&
 	test_must_fail git rev-parse --verify refs/heads/spam &&
-	test_branch master
+	test_branch main
 '
 
 test_expect_success 'checkout of branch with a file in subdir having the same name fails' '
-	git checkout -B master &&
+	git checkout -B main &&
 	status_uno_is_clean &&
 	test_might_fail git branch -D spam &&
 
@@ -265,11 +276,11 @@ test_expect_success 'checkout of branch with a file in subdir having the same na
 	test_must_fail git -C sub checkout spam &&
 	status_uno_is_clean &&
 	test_must_fail git rev-parse --verify refs/heads/spam &&
-	test_branch master
+	test_branch main
 '
 
 test_expect_success 'checkout <branch> -- succeeds, even if a file with the same name exists' '
-	git checkout -B master &&
+	git checkout -B main &&
 	status_uno_is_clean &&
 	test_might_fail git branch -D spam &&
 
@@ -283,7 +294,7 @@ test_expect_success 'checkout <branch> -- succeeds, even if a file with the same
 
 test_expect_success 'loosely defined local base branch is reported correctly' '
 
-	git checkout master &&
+	git checkout main &&
 	status_uno_is_clean &&
 	git branch strict &&
 	git branch loose &&
@@ -291,13 +302,16 @@ test_expect_success 'loosely defined local base branch is reported correctly' '
 
 	test_config branch.strict.remote . &&
 	test_config branch.loose.remote . &&
-	test_config branch.strict.merge refs/heads/master &&
-	test_config branch.loose.merge master &&
+	test_config branch.strict.merge refs/heads/main &&
+	test_config branch.loose.merge main &&
 
-	git checkout strict | sed -e "s/strict/BRANCHNAME/g" >expect &&
+	git checkout strict >expect.raw 2>&1 &&
+	sed -e "s/strict/BRANCHNAME/g" <expect.raw >expect &&
 	status_uno_is_clean &&
-	git checkout loose | sed -e "s/loose/BRANCHNAME/g" >actual &&
+	git checkout loose >actual.raw 2>&1 &&
+	sed -e "s/loose/BRANCHNAME/g" <actual.raw >actual &&
 	status_uno_is_clean &&
+	grep BRANCHNAME actual &&
 
 	test_cmp expect actual
 '
diff --git a/t/t2025-checkout-no-overlay.sh b/t/t2025-checkout-no-overlay.sh
index 76330cb..246609d 100755
--- a/t/t2025-checkout-no-overlay.sh
+++ b/t/t2025-checkout-no-overlay.sh
@@ -2,6 +2,7 @@
 
 test_description='checkout --no-overlay <tree-ish> -- <pathspec>'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -25,7 +26,7 @@ test_expect_success 'checkout --no-overlay removing last file from directory' '
 
 test_expect_success 'checkout -p --overlay is disallowed' '
 	test_must_fail git checkout -p --overlay HEAD 2>actual &&
-	test_i18ngrep "fatal: -p and --overlay are mutually exclusive" actual
+	test_grep "fatal: options .-p. and .--overlay. cannot be used together" actual
 '
 
 test_expect_success '--no-overlay --theirs with D/F conflict deletes file' '
@@ -44,4 +45,16 @@ test_expect_success '--no-overlay --theirs with D/F conflict deletes file' '
 	test_path_is_missing file1
 '
 
+test_expect_success 'wildcard pathspec matches file in subdirectory' '
+	git reset --hard &&
+	mkdir subdir &&
+	test_commit file3-1 subdir/file3 &&
+	test_commit file3-2 subdir/file3 &&
+
+	git checkout --no-overlay file3-1 "*file3" &&
+	echo file3-1 >expect &&
+	test_path_is_file subdir/file3 &&
+	test_cmp expect subdir/file3
+'
+
 test_done
diff --git a/t/t2026-checkout-pathspec-file.sh b/t/t2026-checkout-pathspec-file.sh
index 43d31d7..acd5521 100755
--- a/t/t2026-checkout-pathspec-file.sh
+++ b/t/t2026-checkout-pathspec-file.sh
@@ -2,6 +2,7 @@
 
 test_description='checkout --pathspec-from-file'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_tick
@@ -148,16 +149,16 @@ test_expect_success 'error conditions' '
 	echo fileA.t >list &&
 
 	test_must_fail git checkout --pathspec-from-file=list --detach 2>err &&
-	test_i18ngrep -e "--pathspec-from-file is incompatible with --detach" err &&
+	test_grep -e "options .--pathspec-from-file. and .--detach. cannot be used together" err &&
 
 	test_must_fail git checkout --pathspec-from-file=list --patch 2>err &&
-	test_i18ngrep -e "--pathspec-from-file is incompatible with --patch" err &&
+	test_grep -e "options .--pathspec-from-file. and .--patch. cannot be used together" err &&
 
 	test_must_fail git checkout --pathspec-from-file=list -- fileA.t 2>err &&
-	test_i18ngrep -e "--pathspec-from-file is incompatible with pathspec arguments" err &&
+	test_grep -e ".--pathspec-from-file. and pathspec arguments cannot be used together" err &&
 
 	test_must_fail git checkout --pathspec-file-nul 2>err &&
-	test_i18ngrep -e "--pathspec-file-nul requires --pathspec-from-file" err
+	test_grep -e "the option .--pathspec-file-nul. requires .--pathspec-from-file." err
 '
 
 test_done
diff --git a/t/t2027-checkout-track.sh b/t/t2027-checkout-track.sh
index bcba1bf..98f16c7 100755
--- a/t/t2027-checkout-track.sh
+++ b/t/t2027-checkout-track.sh
@@ -2,6 +2,10 @@
 
 test_description='tests for git branch --track'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -10,15 +14,38 @@ test_expect_success 'setup' '
 '
 
 test_expect_success 'checkout --track -b creates a new tracking branch' '
-	git checkout --track -b branch1 master &&
+	git checkout --track -b branch1 main &&
 	test $(git rev-parse --abbrev-ref HEAD) = branch1 &&
 	test $(git config --get branch.branch1.remote) = . &&
-	test $(git config --get branch.branch1.merge) = refs/heads/master
+	test $(git config --get branch.branch1.merge) = refs/heads/main
 '
 
 test_expect_success 'checkout --track -b rejects an extra path argument' '
-	test_must_fail git checkout --track -b branch2 master one.t 2>err &&
-	test_i18ngrep "cannot be used with updating paths" err
+	test_must_fail git checkout --track -b branch2 main one.t 2>err &&
+	test_grep "cannot be used with updating paths" err
+'
+
+test_expect_success 'checkout --track -b overrides autoSetupMerge=inherit' '
+	# Set up tracking config on main
+	test_config branch.main.remote origin &&
+	test_config branch.main.merge refs/heads/some-branch &&
+	test_config branch.autoSetupMerge inherit &&
+	# With --track=inherit, we copy the tracking config from main
+	git checkout --track=inherit -b b1 main &&
+	test_cmp_config origin branch.b1.remote &&
+	test_cmp_config refs/heads/some-branch branch.b1.merge &&
+	# With branch.autoSetupMerge=inherit, we do the same
+	git checkout -b b2 main &&
+	test_cmp_config origin branch.b2.remote &&
+	test_cmp_config refs/heads/some-branch branch.b2.merge &&
+	# But --track overrides this
+	git checkout --track -b b3 main &&
+	test_cmp_config . branch.b3.remote &&
+	test_cmp_config refs/heads/main branch.b3.merge &&
+	# And --track=direct does as well
+	git checkout --track=direct -b b4 main &&
+	test_cmp_config . branch.b4.remote &&
+	test_cmp_config refs/heads/main branch.b4.merge
 '
 
 test_done
diff --git a/t/t2030-unresolve-info.sh b/t/t2030-unresolve-info.sh
index 309199b..be3fcdd 100755
--- a/t/t2030-unresolve-info.sh
+++ b/t/t2030-unresolve-info.sh
@@ -2,6 +2,9 @@
 
 test_description='undoing resolution'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 check_resolve_undo () {
@@ -34,11 +37,17 @@ prime_resolve_undo () {
 	git checkout second^0 &&
 	test_tick &&
 	test_must_fail git merge third^0 &&
-	echo merge does not leave anything &&
 	check_resolve_undo empty &&
-	echo different >fi/le &&
-	git add fi/le &&
-	echo resolving records &&
+
+	# how should the conflict be resolved?
+	case "$1" in
+	remove)
+		rm -f file/le && git rm fi/le
+		;;
+	*) # modify
+		echo different >fi/le && git add fi/le
+		;;
+	esac
 	check_resolve_undo recorded fi/le initial:fi/le second:fi/le third:fi/le
 }
 
@@ -59,7 +68,7 @@ test_expect_success setup '
 	test_commit fourth fi/le fourth &&
 	git checkout add-add &&
 	test_commit fifth add-differently &&
-	git checkout master
+	git checkout main
 '
 
 test_expect_success 'add records switch clears' '
@@ -119,6 +128,37 @@ test_expect_success 'add records checkout -m undoes' '
 test_expect_success 'unmerge with plumbing' '
 	prime_resolve_undo &&
 	git update-index --unresolve fi/le &&
+	git ls-files --resolve-undo fi/le >actual &&
+	test_must_be_empty actual &&
+	git ls-files -u >actual &&
+	test_line_count = 3 actual
+'
+
+test_expect_success 'unmerge can be done even after committing' '
+	prime_resolve_undo &&
+	git commit -m "record to nuke MERGE_HEAD" &&
+	git update-index --unresolve fi/le &&
+	git ls-files --resolve-undo fi/le >actual &&
+	test_must_be_empty actual &&
+	git ls-files -u >actual &&
+	test_line_count = 3 actual
+'
+
+test_expect_success 'unmerge removal' '
+	prime_resolve_undo remove &&
+	git update-index --unresolve fi/le &&
+	git ls-files --resolve-undo fi/le >actual &&
+	test_must_be_empty actual &&
+	git ls-files -u >actual &&
+	test_line_count = 3 actual
+'
+
+test_expect_success 'unmerge removal after committing' '
+	prime_resolve_undo remove &&
+	git commit -m "record to nuke MERGE_HEAD" &&
+	git update-index --unresolve fi/le &&
+	git ls-files --resolve-undo fi/le >actual &&
+	test_must_be_empty actual &&
 	git ls-files -u >actual &&
 	test_line_count = 3 actual
 '
@@ -176,20 +216,90 @@ test_expect_success 'rerere and rerere forget (subdirectory)' '
 
 test_expect_success 'rerere forget (binary)' '
 	git checkout -f side &&
-	printf "a\0c" >binary &&
-	git commit -a -m binary &&
+	test_commit --printf binary binary "a\0c" &&
 	test_must_fail git merge second &&
 	git rerere forget binary
 '
 
 test_expect_success 'rerere forget (add-add conflict)' '
-	git checkout -f master &&
-	echo master >add-differently &&
+	git checkout -f main &&
+	echo main >add-differently &&
 	git add add-differently &&
 	git commit -m "add differently" &&
 	test_must_fail git merge fifth &&
 	git rerere forget add-differently 2>actual &&
-	test_i18ngrep "no remembered" actual
+	test_grep "no remembered" actual
+'
+
+test_expect_success 'resolve-undo keeps blobs from gc' '
+	git checkout -f main &&
+
+	# First make sure we do not have any cruft left in the object store
+	git repack -a -d &&
+	git prune --expire=now &&
+	git prune-packed &&
+	git gc --prune=now &&
+	git fsck --unreachable >cruft &&
+	test_must_be_empty cruft &&
+
+	# Now add three otherwise unreferenced blob objects to the index
+	git reset --hard &&
+	B1=$(echo "resolve undo test data 1" | git hash-object -w --stdin) &&
+	B2=$(echo "resolve undo test data 2" | git hash-object -w --stdin) &&
+	B3=$(echo "resolve undo test data 3" | git hash-object -w --stdin) &&
+	git update-index --add --index-info <<-EOF &&
+	100644 $B1 1	frotz
+	100644 $B2 2	frotz
+	100644 $B3 3	frotz
+	EOF
+
+	# These three blob objects are reachable (only) from the index
+	git fsck --unreachable >cruft &&
+	test_must_be_empty cruft &&
+	# and they should be protected from GC
+	git gc --prune=now &&
+	git cat-file -e $B1 &&
+	git cat-file -e $B2 &&
+	git cat-file -e $B3 &&
+
+	# Now resolve the conflicted path
+	B0=$(echo "resolve undo test data 0" | git hash-object -w --stdin) &&
+	git update-index --add --cacheinfo 100644,$B0,frotz &&
+
+	# These three blob objects are now reachable only from the resolve-undo
+	git fsck --unreachable >cruft &&
+	test_must_be_empty cruft &&
+
+	# and they should survive GC
+	git gc --prune=now &&
+	git cat-file -e $B0 &&
+	git cat-file -e $B1 &&
+	git cat-file -e $B2 &&
+	git cat-file -e $B3 &&
+
+	# Now we switch away, which nukes resolve-undo, and
+	# blobs B0..B3 would become dangling.  fsck should
+	# notice that they are now unreachable.
+	git checkout -f side &&
+	git fsck --unreachable >cruft &&
+	sort cruft >actual &&
+	sort <<-EOF >expect &&
+	unreachable blob $B0
+	unreachable blob $B1
+	unreachable blob $B2
+	unreachable blob $B3
+	EOF
+	test_cmp expect actual &&
+
+	# And they should go away when gc runs.
+	git gc --prune=now &&
+	git fsck --unreachable >cruft &&
+	test_must_be_empty cruft &&
+
+	test_must_fail git cat-file -e $B0 &&
+	test_must_fail git cat-file -e $B1 &&
+	test_must_fail git cat-file -e $B2 &&
+	test_must_fail git cat-file -e $B3
 '
 
 test_done
diff --git a/t/t2050-git-dir-relative.sh b/t/t2050-git-dir-relative.sh
index 21f4659..1f193cd 100755
--- a/t/t2050-git-dir-relative.sh
+++ b/t/t2050-git-dir-relative.sh
@@ -12,6 +12,7 @@ into the subdir while keeping the worktree location,
 and tries commits from the top and the subdir, checking
 that the commit-hook still gets called.'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 COMMIT_FILE="$(pwd)/output"
diff --git a/t/t2060-switch.sh b/t/t2060-switch.sh
index 2c1b8c0..c91c4db 100755
--- a/t/t2060-switch.sh
+++ b/t/t2060-switch.sh
@@ -2,6 +2,9 @@
 
 test_description='switch basic functionality'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -23,41 +26,52 @@ test_expect_success 'switch branch' '
 '
 
 test_expect_success 'switch and detach' '
-	test_when_finished git switch master &&
-	test_must_fail git switch master^{commit} &&
-	git switch --detach master^{commit} &&
+	test_when_finished git switch main &&
+	test_must_fail git switch main^{commit} &&
+	git switch --detach main^{commit} &&
 	test_must_fail git symbolic-ref HEAD
 '
 
+test_expect_success 'suggestion to detach' '
+	test_must_fail git switch main^{commit} 2>stderr &&
+	grep "try again with the --detach option" stderr
+'
+
+test_expect_success 'suggestion to detach is suppressed with advice.suggestDetachingHead=false' '
+	test_config advice.suggestDetachingHead false &&
+	test_must_fail git switch main^{commit} 2>stderr &&
+	! grep "try again with the --detach option" stderr
+'
+
 test_expect_success 'switch and detach current branch' '
-	test_when_finished git switch master &&
-	git switch master &&
+	test_when_finished git switch main &&
+	git switch main &&
 	git switch --detach &&
 	test_must_fail git symbolic-ref HEAD
 '
 
 test_expect_success 'switch and create branch' '
-	test_when_finished git switch master &&
-	git switch -c temp master^ &&
-	test_cmp_rev master^ refs/heads/temp &&
+	test_when_finished git switch main &&
+	git switch -c temp main^ &&
+	test_cmp_rev main^ refs/heads/temp &&
 	echo refs/heads/temp >expected-branch &&
 	git symbolic-ref HEAD >actual-branch &&
 	test_cmp expected-branch actual-branch
 '
 
 test_expect_success 'force create branch from HEAD' '
-	test_when_finished git switch master &&
-	git switch --detach master &&
+	test_when_finished git switch main &&
+	git switch --detach main &&
 	test_must_fail git switch -c temp &&
 	git switch -C temp &&
-	test_cmp_rev master refs/heads/temp &&
+	test_cmp_rev main refs/heads/temp &&
 	echo refs/heads/temp >expected-branch &&
 	git symbolic-ref HEAD >actual-branch &&
 	test_cmp expected-branch actual-branch
 '
 
 test_expect_success 'new orphan branch from empty' '
-	test_when_finished git switch master &&
+	test_when_finished git switch main &&
 	test_must_fail git switch --orphan new-orphan HEAD &&
 	git switch --orphan new-orphan &&
 	test_commit orphan &&
@@ -69,7 +83,7 @@ test_expect_success 'new orphan branch from empty' '
 '
 
 test_expect_success 'orphan branch works with --discard-changes' '
-	test_when_finished git switch master &&
+	test_when_finished git switch main &&
 	echo foo >foo.txt &&
 	git switch --discard-changes --orphan new-orphan2 &&
 	git ls-files >tracked-files &&
@@ -77,7 +91,7 @@ test_expect_success 'orphan branch works with --discard-changes' '
 '
 
 test_expect_success 'switching ignores file of same branch name' '
-	test_when_finished git switch master &&
+	test_when_finished git switch main &&
 	: >first-branch &&
 	git switch first-branch &&
 	echo refs/heads/first-branch >expected &&
@@ -85,9 +99,12 @@ test_expect_success 'switching ignores file of same branch name' '
 	test_cmp expected actual
 '
 
-test_expect_success 'guess and create branch ' '
-	test_when_finished git switch master &&
+test_expect_success 'guess and create branch' '
+	test_when_finished git switch main &&
 	test_must_fail git switch --no-guess foo &&
+	test_config checkout.guess false &&
+	test_must_fail git switch foo &&
+	test_config checkout.guess true &&
 	git switch foo &&
 	echo refs/heads/foo >expected &&
 	git symbolic-ref HEAD >actual &&
@@ -101,4 +118,63 @@ test_expect_success 'not switching when something is in progress' '
 	test_must_fail git switch -d @^
 '
 
+test_expect_success 'tracking info copied with autoSetupMerge=inherit' '
+	# default config does not copy tracking info
+	git switch -c foo-no-inherit foo &&
+	test_cmp_config "" --default "" branch.foo-no-inherit.remote &&
+	test_cmp_config "" --default "" branch.foo-no-inherit.merge &&
+	# with --track=inherit, we copy tracking info from foo
+	git switch --track=inherit -c foo2 foo &&
+	test_cmp_config origin branch.foo2.remote &&
+	test_cmp_config refs/heads/foo branch.foo2.merge &&
+	# with autoSetupMerge=inherit, we do the same
+	test_config branch.autoSetupMerge inherit &&
+	git switch -c foo3 foo &&
+	test_cmp_config origin branch.foo3.remote &&
+	test_cmp_config refs/heads/foo branch.foo3.merge &&
+	# with --track, we override autoSetupMerge
+	git switch --track -c foo4 foo &&
+	test_cmp_config . branch.foo4.remote &&
+	test_cmp_config refs/heads/foo branch.foo4.merge &&
+	# and --track=direct does as well
+	git switch --track=direct -c foo5 foo &&
+	test_cmp_config . branch.foo5.remote &&
+	test_cmp_config refs/heads/foo branch.foo5.merge &&
+	# no tracking info to inherit from main
+	git switch -c main2 main &&
+	test_cmp_config "" --default "" branch.main2.remote &&
+	test_cmp_config "" --default "" branch.main2.merge
+'
+
+test_expect_success 'switch back when temporarily detached and checked out elsewhere ' '
+	test_when_finished "
+		git worktree remove wt1 ||:
+		git worktree remove wt2 ||:
+		git checkout - ||:
+		git branch -D shared ||:
+	" &&
+	git checkout -b shared &&
+	test_commit shared-first &&
+	HASH1=$(git rev-parse --verify HEAD) &&
+	test_commit shared-second &&
+	test_commit shared-third &&
+	HASH2=$(git rev-parse --verify HEAD) &&
+	git worktree add wt1 -f shared &&
+	git -C wt1 bisect start &&
+	git -C wt1 bisect good $HASH1 &&
+	git -C wt1 bisect bad $HASH2 &&
+	git worktree add wt2 -f shared &&
+	git -C wt2 bisect start &&
+	git -C wt2 bisect good $HASH1 &&
+	git -C wt2 bisect bad $HASH2 &&
+	# we test in both worktrees to ensure that works
+	# as expected with "first" and "next" worktrees
+	test_must_fail git -C wt1 switch shared &&
+	test_must_fail git -C wt1 switch -C shared &&
+	git -C wt1 switch --ignore-other-worktrees shared &&
+	test_must_fail git -C wt2 switch shared &&
+	test_must_fail git -C wt2 switch -C shared &&
+	git -C wt2 switch --ignore-other-worktrees shared
+'
+
 test_done
diff --git a/t/t2070-restore.sh b/t/t2070-restore.sh
index 89e5a14..ac40494 100755
--- a/t/t2070-restore.sh
+++ b/t/t2070-restore.sh
@@ -2,6 +2,10 @@
 
 test_description='restore basic functionality'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -15,7 +19,7 @@ test_expect_success 'setup' '
 	echo ignored >ignored &&
 	echo /ignored >.gitignore &&
 	git add one two .gitignore &&
-	git update-ref refs/heads/one master
+	git update-ref refs/heads/one main
 '
 
 test_expect_success 'restore without pathspec is not ok' '
@@ -91,7 +95,7 @@ test_expect_success 'restore --ignore-unmerged ignores unmerged entries' '
 		git switch -c first &&
 		echo first >unmerged &&
 		git commit -am first &&
-		git switch -c second master &&
+		git switch -c second main &&
 		echo second >unmerged &&
 		git commit -am second &&
 		test_must_fail git merge first &&
@@ -134,4 +138,87 @@ test_expect_success 'restore --staged invalidates cache tree for deletions' '
 	test_must_fail git rev-parse HEAD:new1
 '
 
+test_expect_success 'restore --merge to unresolve' '
+	O=$(echo original | git hash-object -w --stdin) &&
+	A=$(echo ourside | git hash-object -w --stdin) &&
+	B=$(echo theirside | git hash-object -w --stdin) &&
+	{
+		echo "100644 $O 1	file" &&
+		echo "100644 $A 2	file" &&
+		echo "100644 $B 3	file"
+	} | git update-index --index-info &&
+	echo nothing >file &&
+	git restore --worktree --merge file &&
+	cat >expect <<-\EOF &&
+	<<<<<<< ours
+	ourside
+	=======
+	theirside
+	>>>>>>> theirs
+	EOF
+	test_cmp expect file
+'
+
+test_expect_success 'restore --merge to unresolve after (mistaken) resolution' '
+	O=$(echo original | git hash-object -w --stdin) &&
+	A=$(echo ourside | git hash-object -w --stdin) &&
+	B=$(echo theirside | git hash-object -w --stdin) &&
+	{
+		echo "100644 $O 1	file" &&
+		echo "100644 $A 2	file" &&
+		echo "100644 $B 3	file"
+	} | git update-index --index-info &&
+	echo nothing >file &&
+	git add file &&
+	git restore --worktree --merge file &&
+	cat >expect <<-\EOF &&
+	<<<<<<< ours
+	ourside
+	=======
+	theirside
+	>>>>>>> theirs
+	EOF
+	test_cmp expect file
+'
+
+test_expect_success 'restore --merge to unresolve after (mistaken) resolution' '
+	O=$(echo original | git hash-object -w --stdin) &&
+	A=$(echo ourside | git hash-object -w --stdin) &&
+	B=$(echo theirside | git hash-object -w --stdin) &&
+	{
+		echo "100644 $O 1	file" &&
+		echo "100644 $A 2	file" &&
+		echo "100644 $B 3	file"
+	} | git update-index --index-info &&
+	git rm -f file &&
+	git restore --worktree --merge file &&
+	cat >expect <<-\EOF &&
+	<<<<<<< ours
+	ourside
+	=======
+	theirside
+	>>>>>>> theirs
+	EOF
+	test_cmp expect file
+'
+
+test_expect_success 'restore with merge options are incompatible with certain options' '
+	for opts in \
+		"--staged --ours" \
+		"--staged --theirs" \
+		"--staged --merge" \
+		"--source=HEAD --ours" \
+		"--source=HEAD --theirs" \
+		"--source=HEAD --merge" \
+		"--staged --conflict=diff3" \
+		"--staged --worktree --ours" \
+		"--staged --worktree --theirs" \
+		"--staged --worktree --merge" \
+		"--staged --worktree --conflict=zdiff3"
+	do
+		test_must_fail git restore $opts . 2>err &&
+		grep "cannot be used" err || return
+	done
+'
+
 test_done
diff --git a/t/t2071-restore-patch.sh b/t/t2071-restore-patch.sh
index 98b2476..42d5522 100755
--- a/t/t2071-restore-patch.sh
+++ b/t/t2071-restore-patch.sh
@@ -2,9 +2,10 @@
 
 test_description='git restore --patch'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./lib-patch-mode.sh
 
-test_expect_success PERL 'setup' '
+test_expect_success 'setup' '
 	mkdir dir &&
 	echo parent >dir/foo &&
 	echo dummy >bar &&
@@ -16,51 +17,63 @@ test_expect_success PERL 'setup' '
 	save_head
 '
 
-test_expect_success PERL 'restore -p without pathspec is fine' '
+test_expect_success 'restore -p without pathspec is fine' '
 	echo q >cmd &&
 	git restore -p <cmd
 '
 
 # note: bar sorts before dir/foo, so the first 'n' is always to skip 'bar'
 
-test_expect_success PERL 'saying "n" does nothing' '
+test_expect_success 'saying "n" does nothing' '
 	set_and_save_state dir/foo work head &&
 	test_write_lines n n | git restore -p &&
 	verify_saved_state bar &&
 	verify_saved_state dir/foo
 '
 
-test_expect_success PERL 'git restore -p' '
+test_expect_success 'git restore -p' '
 	set_and_save_state dir/foo work head &&
 	test_write_lines n y | git restore -p &&
 	verify_saved_state bar &&
 	verify_state dir/foo head head
 '
 
-test_expect_success PERL 'git restore -p with staged changes' '
+test_expect_success 'git restore -p with staged changes' '
 	set_state dir/foo work index &&
 	test_write_lines n y | git restore -p &&
 	verify_saved_state bar &&
 	verify_state dir/foo index index
 '
 
-test_expect_success PERL 'git restore -p --source=HEAD' '
+for opt in "HEAD" "@"
+do
+	test_expect_success "git restore -p --source=$opt" '
+		set_state dir/foo work index &&
+		# the third n is to get out in case it mistakenly does not apply
+		test_write_lines n y n | git restore -p --source=$opt >output &&
+		verify_saved_state bar &&
+		verify_state dir/foo head index &&
+		test_grep "Discard" output
+	'
+done
+
+test_expect_success 'git restore -p --source=HEAD^' '
 	set_state dir/foo work index &&
 	# the third n is to get out in case it mistakenly does not apply
-	test_write_lines n y n | git restore -p --source=HEAD &&
+	test_write_lines n y n | git restore -p --source=HEAD^ &&
 	verify_saved_state bar &&
-	verify_state dir/foo head index
+	verify_state dir/foo parent index
 '
 
-test_expect_success PERL 'git restore -p --source=HEAD^' '
+test_expect_success 'git restore -p --source=HEAD^...' '
 	set_state dir/foo work index &&
 	# the third n is to get out in case it mistakenly does not apply
-	test_write_lines n y n | git restore -p --source=HEAD^ &&
+	test_write_lines n y n | git restore -p --source=HEAD^... &&
 	verify_saved_state bar &&
 	verify_state dir/foo parent index
 '
 
-test_expect_success PERL 'git restore -p handles deletion' '
+test_expect_success 'git restore -p handles deletion' '
 	set_state dir/foo work index &&
 	rm dir/foo &&
 	test_write_lines n y | git restore -p &&
@@ -73,21 +86,21 @@ test_expect_success PERL 'git restore -p handles deletion' '
 # dir/foo.  There's always an extra 'n' to reject edits to dir/foo in
 # the failure case (and thus get out of the loop).
 
-test_expect_success PERL 'path limiting works: dir' '
+test_expect_success 'path limiting works: dir' '
 	set_state dir/foo work head &&
 	test_write_lines y n | git restore -p dir &&
 	verify_saved_state bar &&
 	verify_state dir/foo head head
 '
 
-test_expect_success PERL 'path limiting works: -- dir' '
+test_expect_success 'path limiting works: -- dir' '
 	set_state dir/foo work head &&
 	test_write_lines y n | git restore -p -- dir &&
 	verify_saved_state bar &&
 	verify_state dir/foo head head
 '
 
-test_expect_success PERL 'path limiting works: HEAD^ -- dir' '
+test_expect_success 'path limiting works: HEAD^ -- dir' '
 	set_state dir/foo work head &&
 	# the third n is to get out in case it mistakenly does not apply
 	test_write_lines y n n | git restore -p --source=HEAD^ -- dir &&
@@ -95,7 +108,7 @@ test_expect_success PERL 'path limiting works: HEAD^ -- dir' '
 	verify_state dir/foo parent head
 '
 
-test_expect_success PERL 'path limiting works: foo inside dir' '
+test_expect_success 'path limiting works: foo inside dir' '
 	set_state dir/foo work head &&
 	# the third n is to get out in case it mistakenly does not apply
 	test_write_lines y n n | (cd dir && git restore -p foo) &&
@@ -103,7 +116,7 @@ test_expect_success PERL 'path limiting works: foo inside dir' '
 	verify_state dir/foo head head
 '
 
-test_expect_success PERL 'none of this moved HEAD' '
+test_expect_success 'none of this moved HEAD' '
 	verify_saved_head
 '
 
diff --git a/t/t2072-restore-pathspec-file.sh b/t/t2072-restore-pathspec-file.sh
index 0d47946..86c9c88 100755
--- a/t/t2072-restore-pathspec-file.sh
+++ b/t/t2072-restore-pathspec-file.sh
@@ -2,6 +2,7 @@
 
 test_description='restore --pathspec-from-file'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_tick
@@ -9,18 +10,21 @@ test_tick
 test_expect_success setup '
 	test_commit file0 &&
 
+	mkdir dir1 &&
+	echo 1 >dir1/file &&
 	echo 1 >fileA.t &&
 	echo 1 >fileB.t &&
 	echo 1 >fileC.t &&
 	echo 1 >fileD.t &&
-	git add fileA.t fileB.t fileC.t fileD.t &&
+	git add dir1 fileA.t fileB.t fileC.t fileD.t &&
 	git commit -m "files 1" &&
 
+	echo 2 >dir1/file &&
 	echo 2 >fileA.t &&
 	echo 2 >fileB.t &&
 	echo 2 >fileC.t &&
 	echo 2 >fileD.t &&
-	git add fileA.t fileB.t fileC.t fileD.t &&
+	git add dir1 fileA.t fileB.t fileC.t fileD.t &&
 	git commit -m "files 2" &&
 
 	git tag checkpoint
@@ -31,7 +35,7 @@ restore_checkpoint () {
 }
 
 verify_expect () {
-	git status --porcelain --untracked-files=no -- fileA.t fileB.t fileC.t fileD.t >actual &&
+	git status --porcelain --untracked-files=no -- dir1 fileA.t fileB.t fileC.t fileD.t >actual &&
 	test_cmp expect actual
 }
 
@@ -149,16 +153,26 @@ test_expect_success 'error conditions' '
 	>empty_list &&
 
 	test_must_fail git restore --pathspec-from-file=list --patch --source=HEAD^1 2>err &&
-	test_i18ngrep -e "--pathspec-from-file is incompatible with --patch" err &&
+	test_grep -e "options .--pathspec-from-file. and .--patch. cannot be used together" err &&
 
 	test_must_fail git restore --pathspec-from-file=list --source=HEAD^1 -- fileA.t 2>err &&
-	test_i18ngrep -e "--pathspec-from-file is incompatible with pathspec arguments" err &&
+	test_grep -e ".--pathspec-from-file. and pathspec arguments cannot be used together" err &&
 
 	test_must_fail git restore --pathspec-file-nul --source=HEAD^1 2>err &&
-	test_i18ngrep -e "--pathspec-file-nul requires --pathspec-from-file" err &&
+	test_grep -e "the option .--pathspec-file-nul. requires .--pathspec-from-file." err &&
 
 	test_must_fail git restore --pathspec-from-file=empty_list --source=HEAD^1 2>err &&
-	test_i18ngrep -e "you must specify path(s) to restore" err
+	test_grep -e "you must specify path(s) to restore" err
+'
+
+test_expect_success 'wildcard pathspec matches file in subdirectory' '
+	restore_checkpoint &&
+
+	echo "*file" | git restore --pathspec-from-file=- --source=HEAD^1 &&
+	cat >expect <<-\EOF &&
+	 M dir1/file
+	EOF
+	verify_expect
 '
 
 test_done
diff --git a/t/t2080-parallel-checkout-basics.sh b/t/t2080-parallel-checkout-basics.sh
new file mode 100755
index 0000000..5ffe1a4
--- /dev/null
+++ b/t/t2080-parallel-checkout-basics.sh
@@ -0,0 +1,277 @@
+#!/bin/sh
+
+test_description='parallel-checkout basics
+
+Ensure that parallel-checkout basically works on clone and checkout, spawning
+the required number of workers and correctly populating both the index and the
+working tree.
+'
+
+TEST_NO_CREATE_REPO=1
+. ./test-lib.sh
+. "$TEST_DIRECTORY/lib-parallel-checkout.sh"
+
+# Test parallel-checkout with a branch switch containing a variety of file
+# creations, deletions, and modifications, involving different entry types.
+# The branches B1 and B2 have the following paths:
+#
+#      B1                 B2
+#  a/a (file)         a   (file)
+#  b   (file)         b/b (file)
+#
+#  c/c (file)         c   (symlink)
+#  d   (symlink)      d/d (file)
+#
+#  e/e (file)         e   (submodule)
+#  f   (submodule)    f/f (file)
+#
+#  g   (submodule)    g   (symlink)
+#  h   (symlink)      h   (submodule)
+#
+# Additionally, the following paths are present on both branches, but with
+# different contents:
+#
+#  i   (file)         i   (file)
+#  j   (symlink)      j   (symlink)
+#  k   (submodule)    k   (submodule)
+#
+# And the following paths are only present in one of the branches:
+#
+#  l/l (file)         -
+#  -                  m/m (file)
+#
+test_expect_success 'setup repo for checkout with various types of changes' '
+	test_config_global protocol.file.allow always &&
+
+	git init sub &&
+	(
+		cd sub &&
+		git checkout -b B2 &&
+		echo B2 >file &&
+		git add file &&
+		git commit -m file &&
+
+		git checkout -b B1 &&
+		echo B1 >file &&
+		git add file &&
+		git commit -m file
+	) &&
+
+	git init various &&
+	(
+		cd various &&
+
+		git checkout -b B1 &&
+		mkdir a c e &&
+		echo a/a >a/a &&
+		echo b >b &&
+		echo c/c >c/c &&
+		test_ln_s_add c d &&
+		echo e/e >e/e &&
+		git submodule add ../sub f &&
+		git submodule add ../sub g &&
+		test_ln_s_add c h &&
+
+		echo "B1 i" >i &&
+		test_ln_s_add c j &&
+		git submodule add -b B1 ../sub k &&
+		mkdir l &&
+		echo l/l >l/l &&
+
+		git add . &&
+		git commit -m B1 &&
+
+		git checkout -b B2 &&
+		git rm -rf :^.gitmodules :^k &&
+		mkdir b d f &&
+		echo a >a &&
+		echo b/b >b/b &&
+		test_ln_s_add b c &&
+		echo d/d >d/d &&
+		git submodule add ../sub e &&
+		echo f/f >f/f &&
+		test_ln_s_add b g &&
+		git submodule add ../sub h &&
+
+		echo "B2 i" >i &&
+		test_ln_s_add b j &&
+		git -C k checkout B2 &&
+		mkdir m &&
+		echo m/m >m/m &&
+
+		git add . &&
+		git commit -m B2 &&
+
+		git checkout --recurse-submodules B1
+	)
+'
+
+for mode in sequential parallel sequential-fallback
+do
+	case $mode in
+	sequential)          workers=1 threshold=0 expected_workers=0 ;;
+	parallel)            workers=2 threshold=0 expected_workers=2 ;;
+	sequential-fallback) workers=2 threshold=100 expected_workers=0 ;;
+	esac
+
+	test_expect_success "$mode checkout" '
+		repo=various_$mode &&
+		cp -R -P various $repo &&
+
+		# The just copied files have more recent timestamps than their
+		# associated index entries. So refresh the cached timestamps
+		# to avoid an "entry not up-to-date" error from `git checkout`.
+		# We only have to do this for the submodules as `git checkout`
+		# will already refresh the superproject index before performing
+		# the up-to-date check.
+		#
+		git -C $repo submodule foreach "git update-index --refresh" &&
+
+		set_checkout_config $workers $threshold &&
+		test_checkout_workers $expected_workers \
+			git -C $repo checkout --recurse-submodules B2 &&
+		verify_checkout $repo
+	'
+done
+
+for mode in parallel sequential-fallback
+do
+	case $mode in
+	parallel)            workers=2 threshold=0 expected_workers=2 ;;
+	sequential-fallback) workers=2 threshold=100 expected_workers=0 ;;
+	esac
+
+	test_expect_success "$mode checkout on clone" '
+		test_config_global protocol.file.allow always &&
+		repo=various_${mode}_clone &&
+		set_checkout_config $workers $threshold &&
+		test_checkout_workers $expected_workers \
+			git clone --recurse-submodules --branch B2 various $repo &&
+		verify_checkout $repo
+	'
+done
+
+# Just to be paranoid, actually compare the working trees' contents directly.
+test_expect_success 'compare the working trees' '
+	rm -rf various_*/.git &&
+	rm -rf various_*/*/.git &&
+
+	# We use `git diff` instead of `diff -r` because the latter would
+	# follow symlinks, and not all `diff` implementations support the
+	# `--no-dereference` option.
+	#
+	git diff --no-index various_sequential various_parallel &&
+	git diff --no-index various_sequential various_parallel_clone &&
+	git diff --no-index various_sequential various_sequential-fallback &&
+	git diff --no-index various_sequential various_sequential-fallback_clone
+'
+
+# Currently, each submodule is checked out in a separated child process, but
+# these subprocesses must also be able to use parallel checkout workers to
+# write the submodules' entries.
+test_expect_success 'submodules can use parallel checkout' '
+	set_checkout_config 2 0 &&
+	git init super &&
+	(
+		cd super &&
+		git init sub &&
+		test_commit -C sub A &&
+		test_commit -C sub B &&
+		git submodule add ./sub &&
+		git commit -m sub &&
+		rm sub/* &&
+		test_checkout_workers 2 git checkout --recurse-submodules .
+	)
+'
+
+test_expect_success 'parallel checkout respects --[no]-force' '
+	set_checkout_config 2 0 &&
+	git init dirty &&
+	(
+		cd dirty &&
+		mkdir D &&
+		test_commit D/F &&
+		test_commit F &&
+
+		rm -rf D &&
+		echo changed >D &&
+		echo changed >F.t &&
+
+		# We expect 0 workers because there is nothing to be done
+		test_checkout_workers 0 git checkout HEAD &&
+		test_path_is_file D &&
+		grep changed D &&
+		grep changed F.t &&
+
+		test_checkout_workers 2 git checkout --force HEAD &&
+		test_path_is_dir D &&
+		grep D/F D/F.t &&
+		grep F F.t
+	)
+'
+
+test_expect_success SYMLINKS 'parallel checkout checks for symlinks in leading dirs' '
+	set_checkout_config 2 0 &&
+	git init symlinks &&
+	(
+		cd symlinks &&
+		mkdir D untracked &&
+		# Commit 2 files to have enough work for 2 parallel workers
+		test_commit D/A &&
+		test_commit D/B &&
+		rm -rf D &&
+		ln -s untracked D &&
+
+		test_checkout_workers 2 git checkout --force HEAD &&
+		! test -h D &&
+		grep D/A D/A.t &&
+		grep D/B D/B.t
+	)
+'
+
+# This test is here (and not in e.g. t2022-checkout-paths.sh), because we
+# check the final report including sequential, parallel, and delayed entries
+# all at the same time. So we must have finer control of the parallel checkout
+# variables.
+test_expect_success '"git checkout ." report should not include failed entries' '
+	test_config_global filter.delay.process \
+		"test-tool rot13-filter --always-delay --log=delayed.log clean smudge delay" &&
+	test_config_global filter.delay.required true &&
+	test_config_global filter.cat.clean cat  &&
+	test_config_global filter.cat.smudge cat  &&
+	test_config_global filter.cat.required true  &&
+
+	set_checkout_config 2 0 &&
+	git init failed_entries &&
+	(
+		cd failed_entries &&
+		cat >.gitattributes <<-EOF &&
+		*delay*              filter=delay
+		parallel-ineligible* filter=cat
+		EOF
+		echo a >missing-delay.a &&
+		echo a >parallel-ineligible.a &&
+		echo a >parallel-eligible.a &&
+		echo b >success-delay.b &&
+		echo b >parallel-ineligible.b &&
+		echo b >parallel-eligible.b &&
+		git add -A &&
+		git commit -m files &&
+
+		a_blob="$(git rev-parse :parallel-ineligible.a)" &&
+		rm .git/objects/$(test_oid_to_path $a_blob) &&
+		rm *.a *.b &&
+
+		test_checkout_workers 2 test_must_fail git checkout . 2>err &&
+
+		# All *.b entries should succeed and all *.a entries should fail:
+		#  - missing-delay.a: the delay filter will drop this path
+		#  - parallel-*.a: the blob will be missing
+		#
+		grep "Updated 3 paths from the index" err &&
+		test_stdout_line_count = 3 ls *.b &&
+		! ls *.a
+	)
+'
+
+test_done
diff --git a/t/t2081-parallel-checkout-collisions.sh b/t/t2081-parallel-checkout-collisions.sh
new file mode 100755
index 0000000..6acdb89
--- /dev/null
+++ b/t/t2081-parallel-checkout-collisions.sh
@@ -0,0 +1,163 @@
+#!/bin/sh
+
+test_description="path collisions during parallel checkout
+
+Parallel checkout must detect path collisions to:
+
+1) Avoid racily writing to different paths that represent the same file on disk.
+2) Report the colliding entries on clone.
+
+The tests in this file exercise parallel checkout's collision detection code in
+both these mechanics.
+"
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+. "$TEST_DIRECTORY/lib-parallel-checkout.sh"
+
+TEST_ROOT="$PWD"
+
+test_expect_success CASE_INSENSITIVE_FS 'setup' '
+	empty_oid=$(git hash-object -w --stdin </dev/null) &&
+	cat >objs <<-EOF &&
+	100644 $empty_oid	FILE_X
+	100644 $empty_oid	FILE_x
+	100644 $empty_oid	file_X
+	100644 $empty_oid	file_x
+	EOF
+	git update-index --index-info <objs &&
+	git commit -m "colliding files" &&
+	git tag basename_collision &&
+
+	write_script "$TEST_ROOT"/logger_script <<-\EOF
+	echo "$@" >>filter.log
+	EOF
+'
+
+test_workers_in_event_trace ()
+{
+	test $1 -eq $(grep ".event.:.child_start..*checkout--worker" $2 | wc -l)
+}
+
+test_expect_success CASE_INSENSITIVE_FS 'worker detects basename collision' '
+	GIT_TRACE2_EVENT="$(pwd)/trace" git \
+		-c checkout.workers=2 -c checkout.thresholdForParallelism=0 \
+		checkout . &&
+
+	test_workers_in_event_trace 2 trace &&
+	collisions=$(grep -i "category.:.pcheckout.,.key.:.collision/basename.,.value.:.file_x.}" trace | wc -l) &&
+	test $collisions -eq 3
+'
+
+test_expect_success CASE_INSENSITIVE_FS 'worker detects dirname collision' '
+	test_config filter.logger.smudge "\"$TEST_ROOT/logger_script\" %f" &&
+	empty_oid=$(git hash-object -w --stdin </dev/null) &&
+
+	# By setting a filter command to "a", we make it ineligible for parallel
+	# checkout, and thus it is checked out *first*. This way we can ensure
+	# that "A/B" and "A/C" will both collide with the regular file "a".
+	#
+	attr_oid=$(echo "a filter=logger" | git hash-object -w --stdin) &&
+
+	cat >objs <<-EOF &&
+	100644 $empty_oid	A/B
+	100644 $empty_oid	A/C
+	100644 $empty_oid	a
+	100644 $attr_oid	.gitattributes
+	EOF
+	git rm -rf . &&
+	git update-index --index-info <objs &&
+
+	rm -f trace filter.log &&
+	GIT_TRACE2_EVENT="$(pwd)/trace" git \
+		-c checkout.workers=2 -c checkout.thresholdForParallelism=0 \
+		checkout . &&
+
+	# Check that "a" (and only "a") was filtered
+	echo a >expected.log &&
+	test_cmp filter.log expected.log &&
+
+	# Check that it used the right number of workers and detected the collisions
+	test_workers_in_event_trace 2 trace &&
+	grep "category.:.pcheckout.,.key.:.collision/dirname.,.value.:.A/B.}" trace &&
+	grep "category.:.pcheckout.,.key.:.collision/dirname.,.value.:.A/C.}" trace
+'
+
+test_expect_success SYMLINKS,CASE_INSENSITIVE_FS 'do not follow symlinks colliding with leading dir' '
+	empty_oid=$(git hash-object -w --stdin </dev/null) &&
+	symlink_oid=$(echo "./e" | git hash-object -w --stdin) &&
+	mkdir e &&
+
+	cat >objs <<-EOF &&
+	120000 $symlink_oid	D
+	100644 $empty_oid	d/x
+	100644 $empty_oid	e/y
+	EOF
+	git rm -rf . &&
+	git update-index --index-info <objs &&
+
+	set_checkout_config 2 0 &&
+	test_checkout_workers 2 git checkout . &&
+	test_path_is_dir e &&
+	test_path_is_missing e/x
+'
+
+# The two following tests check that parallel checkout correctly reports
+# colliding entries on clone. The sequential code detects a collision by
+# calling lstat() before trying to open(O_CREAT) a file. (Note that this only
+# works for clone.) Then, to find the pair of a colliding item k, it searches
+# cache_entry[0, k-1]. This is not sufficient in parallel checkout because:
+#
+# - A colliding file may be created between the lstat() and open() calls;
+# - A colliding entry might appear in the second half of the cache_entry array.
+#
+test_expect_success CASE_INSENSITIVE_FS 'collision report on clone (w/ racy file creation)' '
+	git reset --hard basename_collision &&
+	set_checkout_config 2 0 &&
+	test_checkout_workers 2 git clone . clone-repo 2>stderr &&
+
+	grep FILE_X stderr &&
+	grep FILE_x stderr &&
+	grep file_X stderr &&
+	grep file_x stderr &&
+	grep "the following paths have collided" stderr
+'
+
+# This test ensures that the collision report code is correctly looking for
+# colliding peers in the second half of the cache_entry array. This is done by
+# defining a smudge command for the *last* array entry, which makes it
+# non-eligible for parallel-checkout. Thus, it is checked out *first*, before
+# spawning the workers.
+#
+# Note: this test doesn't work on Windows because, on this system, the
+# collision report code uses strcmp() to find the colliding pairs when
+# core.ignoreCase is false. And we need this setting for this test so that only
+# 'file_x' matches the pattern of the filter attribute. But the test works on
+# OSX, where the colliding pairs are found using inode.
+#
+test_expect_success CASE_INSENSITIVE_FS,!MINGW,!CYGWIN \
+	'collision report on clone (w/ colliding peer after the detected entry)' '
+
+	test_config_global filter.logger.smudge "\"$TEST_ROOT/logger_script\" %f" &&
+	git reset --hard basename_collision &&
+	echo "file_x filter=logger" >.gitattributes &&
+	git add .gitattributes &&
+	git commit -m "filter for file_x" &&
+
+	rm -rf clone-repo &&
+	set_checkout_config 2 0 &&
+	test_checkout_workers 2 \
+		git -c core.ignoreCase=false clone . clone-repo 2>stderr &&
+
+	grep FILE_X stderr &&
+	grep FILE_x stderr &&
+	grep file_X stderr &&
+	grep file_x stderr &&
+	grep "the following paths have collided" stderr &&
+
+	# Check that only "file_x" was filtered
+	echo file_x >expected.log &&
+	test_cmp clone-repo/filter.log expected.log
+'
+
+test_done
diff --git a/t/t2082-parallel-checkout-attributes.sh b/t/t2082-parallel-checkout-attributes.sh
new file mode 100755
index 0000000..f3511cd
--- /dev/null
+++ b/t/t2082-parallel-checkout-attributes.sh
@@ -0,0 +1,191 @@
+#!/bin/sh
+
+test_description='parallel-checkout: attributes
+
+Verify that parallel-checkout correctly creates files that require
+conversions, as specified in .gitattributes. The main point here is
+to check that the conv_attr data is correctly sent to the workers
+and that it contains sufficient information to smudge files
+properly (without access to the index or attribute stack).
+'
+
+TEST_NO_CREATE_REPO=1
+. ./test-lib.sh
+. "$TEST_DIRECTORY/lib-parallel-checkout.sh"
+. "$TEST_DIRECTORY/lib-encoding.sh"
+
+test_expect_success 'parallel-checkout with ident' '
+	set_checkout_config 2 0 &&
+	git init ident &&
+	(
+		cd ident &&
+		echo "A ident" >.gitattributes &&
+		echo "\$Id\$" >A &&
+		echo "\$Id\$" >B &&
+		git add -A &&
+		git commit -m id &&
+
+		rm A B &&
+		test_checkout_workers 2 git reset --hard &&
+		hexsz=$(test_oid hexsz) &&
+		grep -E "\\\$Id: [0-9a-f]{$hexsz} \\\$" A &&
+		grep "\\\$Id\\\$" B
+	)
+'
+
+test_expect_success 'parallel-checkout with re-encoding' '
+	set_checkout_config 2 0 &&
+	git init encoding &&
+	(
+		cd encoding &&
+		echo text >utf8-text &&
+		write_utf16 <utf8-text >utf16-text &&
+
+		echo "A working-tree-encoding=UTF-16" >.gitattributes &&
+		cp utf16-text A &&
+		cp utf8-text B &&
+		git add A B .gitattributes &&
+		git commit -m encoding &&
+
+		# Check that A is stored in UTF-8
+		git cat-file -p :A >A.internal &&
+		test_cmp_bin utf8-text A.internal &&
+
+		rm A B &&
+		test_checkout_workers 2 git checkout A B &&
+
+		# Check that A (and only A) is re-encoded during checkout
+		test_cmp_bin utf16-text A &&
+		test_cmp_bin utf8-text B
+	)
+'
+
+test_expect_success 'parallel-checkout with eol conversions' '
+	set_checkout_config 2 0 &&
+	git init eol &&
+	(
+		cd eol &&
+		printf "multi\r\nline\r\ntext" >crlf-text &&
+		printf "multi\nline\ntext" >lf-text &&
+
+		git config core.autocrlf false &&
+		echo "A eol=crlf" >.gitattributes &&
+		cp crlf-text A &&
+		cp lf-text B &&
+		git add A B .gitattributes &&
+		git commit -m eol &&
+
+		# Check that A is stored with LF format
+		git cat-file -p :A >A.internal &&
+		test_cmp_bin lf-text A.internal &&
+
+		rm A B &&
+		test_checkout_workers 2 git checkout A B &&
+
+		# Check that A (and only A) is converted to CRLF during checkout
+		test_cmp_bin crlf-text A &&
+		test_cmp_bin lf-text B
+	)
+'
+
+# Entries that require an external filter are not eligible for parallel
+# checkout. Check that both the parallel-eligible and non-eligible entries are
+# properly writen in a single checkout operation.
+#
+test_expect_success 'parallel-checkout and external filter' '
+	set_checkout_config 2 0 &&
+	git init filter &&
+	(
+		cd filter &&
+		write_script <<-\EOF rot13.sh &&
+		tr \
+		  "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ" \
+		  "nopqrstuvwxyzabcdefghijklmNOPQRSTUVWXYZABCDEFGHIJKLM"
+		EOF
+
+		git config filter.rot13.clean "\"$(pwd)/rot13.sh\"" &&
+		git config filter.rot13.smudge "\"$(pwd)/rot13.sh\"" &&
+		git config filter.rot13.required true &&
+
+		echo abcd >original &&
+		echo nopq >rot13 &&
+
+		echo "A filter=rot13" >.gitattributes &&
+		cp original A &&
+		cp original B &&
+		cp original C &&
+		git add A B C .gitattributes &&
+		git commit -m filter &&
+
+		# Check that A (and only A) was cleaned
+		git cat-file -p :A >A.internal &&
+		test_cmp rot13 A.internal &&
+		git cat-file -p :B >B.internal &&
+		test_cmp original B.internal &&
+		git cat-file -p :C >C.internal &&
+		test_cmp original C.internal &&
+
+		rm A B C *.internal &&
+		test_checkout_workers 2 git checkout A B C &&
+
+		# Check that A (and only A) was smudged during checkout
+		test_cmp original A &&
+		test_cmp original B &&
+		test_cmp original C
+	)
+'
+
+# The delayed queue is independent from the parallel queue, and they should be
+# able to work together in the same checkout process.
+#
+test_expect_success 'parallel-checkout and delayed checkout' '
+	test_config_global filter.delay.process \
+		"test-tool rot13-filter --always-delay --log=\"$(pwd)/delayed.log\" clean smudge delay" &&
+	test_config_global filter.delay.required true &&
+
+	echo "abcd" >original &&
+	echo "nopq" >rot13 &&
+
+	git init delayed &&
+	(
+		cd delayed &&
+		echo "*.d filter=delay" >.gitattributes &&
+		cp ../original W.d &&
+		cp ../original X.d &&
+		cp ../original Y &&
+		cp ../original Z &&
+		git add -A &&
+		git commit -m delayed &&
+
+		# Check that *.d files were cleaned
+		git cat-file -p :W.d >W.d.internal &&
+		test_cmp W.d.internal ../rot13 &&
+		git cat-file -p :X.d >X.d.internal &&
+		test_cmp X.d.internal ../rot13 &&
+		git cat-file -p :Y >Y.internal &&
+		test_cmp Y.internal ../original &&
+		git cat-file -p :Z >Z.internal &&
+		test_cmp Z.internal ../original &&
+
+		rm *
+	) &&
+
+	set_checkout_config 2 0 &&
+	test_checkout_workers 2 git -C delayed checkout -f &&
+	verify_checkout delayed &&
+
+	# Check that the *.d files got to the delay queue and were filtered
+	grep "smudge W.d .* \[DELAYED\]" delayed.log &&
+	grep "smudge X.d .* \[DELAYED\]" delayed.log &&
+	test_cmp delayed/W.d original &&
+	test_cmp delayed/X.d original &&
+
+	# Check that the parallel-eligible entries went to the right queue and
+	# were not filtered
+	! grep "smudge Y .* \[DELAYED\]" delayed.log &&
+	! grep "smudge Z .* \[DELAYED\]" delayed.log &&
+	test_cmp delayed/Y original &&
+	test_cmp delayed/Z original
+'
+
+test_done
diff --git a/t/t2100-update-cache-badpath.sh b/t/t2100-update-cache-badpath.sh
index 2df3fdd..7915e7b 100755
--- a/t/t2100-update-cache-badpath.sh
+++ b/t/t2100-update-cache-badpath.sh
@@ -22,6 +22,7 @@ and tries to git update-index --add the following:
 All of the attempts should fail.
 '
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 mkdir path2 path3
diff --git a/t/t2101-update-index-reupdate.sh b/t/t2101-update-index-reupdate.sh
index 6c32d42..e3c7acd 100755
--- a/t/t2101-update-index-reupdate.sh
+++ b/t/t2101-update-index-reupdate.sh
@@ -6,6 +6,7 @@
 test_description='git update-index --again test.
 '
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'update-index --add' '
diff --git a/t/t2102-update-index-symlinks.sh b/t/t2102-update-index-symlinks.sh
index 22f2c73..c49cdfb 100755
--- a/t/t2102-update-index-symlinks.sh
+++ b/t/t2102-update-index-symlinks.sh
@@ -8,6 +8,7 @@ test_description='git update-index on filesystem w/o symlinks test.
 This tests that git update-index keeps the symbolic link property
 even if a plain file is in the working tree if core.symlinks is false.'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success \
@@ -25,7 +26,7 @@ test_expect_success \
 'the index entry must still be a symbolic link' '
 case "$(git ls-files --stage --cached symlink)" in
 120000" "*symlink) echo pass;;
-*) echo fail; git ls-files --stage --cached symlink; (exit 1);;
+*) echo fail; git ls-files --stage --cached symlink; false;;
 esac'
 
 test_done
diff --git a/t/t2103-update-index-ignore-missing.sh b/t/t2103-update-index-ignore-missing.sh
index 0114f05..e9451cd 100755
--- a/t/t2103-update-index-ignore-missing.sh
+++ b/t/t2103-update-index-ignore-missing.sh
@@ -2,6 +2,7 @@
 
 test_description='update-index with options'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success basics '
@@ -23,7 +24,7 @@ test_expect_success basics '
 	test_cmp expect actual &&
 
 	git update-index --add one two three &&
-	for i in one three two; do echo $i; done >expect &&
+	test_write_lines one three two >expect &&
 	git ls-files >actual &&
 	test_cmp expect actual &&
 
diff --git a/t/t2104-update-index-skip-worktree.sh b/t/t2104-update-index-skip-worktree.sh
index 7e2e7dd..7ec7f30 100755
--- a/t/t2104-update-index-skip-worktree.sh
+++ b/t/t2104-update-index-skip-worktree.sh
@@ -5,27 +5,33 @@
 
 test_description='skip-worktree bit test'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 sane_unset GIT_TEST_SPLIT_INDEX
 
+test_set_index_version () {
+	GIT_INDEX_VERSION="$1"
+	export GIT_INDEX_VERSION
+}
+
 test_set_index_version 3
 
-cat >expect.full <<EOF
-H 1
-H 2
-H sub/1
-H sub/2
-EOF
+test_expect_success 'setup' '
+	cat >expect.full <<-\EOF &&
+	H 1
+	H 2
+	H sub/1
+	H sub/2
+	EOF
 
-cat >expect.skip <<EOF
-S 1
-H 2
-S sub/1
-H sub/2
-EOF
+	cat >expect.skip <<-\EOF &&
+	S 1
+	H 2
+	S sub/1
+	H sub/2
+	EOF
 
-test_expect_success 'setup' '
 	mkdir sub &&
 	touch ./1 ./2 sub/1 sub/2 &&
 	git add 1 2 sub/1 sub/2 &&
@@ -33,7 +39,7 @@ test_expect_success 'setup' '
 '
 
 test_expect_success 'index is at version 2' '
-	test "$(test-tool index-version < .git/index)" = 2
+	test "$(git update-index --show-index-version)" = 2
 '
 
 test_expect_success 'update-index --skip-worktree' '
@@ -42,7 +48,7 @@ test_expect_success 'update-index --skip-worktree' '
 '
 
 test_expect_success 'index is at version 3 after having some skip-worktree entries' '
-	test "$(test-tool index-version < .git/index)" = 3
+	test "$(git update-index --show-index-version)" = 3
 '
 
 test_expect_success 'ls-files -t' '
@@ -55,7 +61,7 @@ test_expect_success 'update-index --no-skip-worktree' '
 '
 
 test_expect_success 'index version is back to 2 when there is no skip-worktree entry' '
-	test "$(test-tool index-version < .git/index)" = 2
+	test "$(git update-index --show-index-version)" = 2
 '
 
 test_done
diff --git a/t/t2105-update-index-gitfile.sh b/t/t2105-update-index-gitfile.sh
index a7f3d47..963ebe7 100755
--- a/t/t2105-update-index-gitfile.sh
+++ b/t/t2105-update-index-gitfile.sh
@@ -6,6 +6,7 @@
 test_description='git update-index for gitlink to .git file.
 '
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'submodule with absolute .git file' '
diff --git a/t/t2106-update-index-assume-unchanged.sh b/t/t2106-update-index-assume-unchanged.sh
index 99d858c..95c004d 100755
--- a/t/t2106-update-index-assume-unchanged.sh
+++ b/t/t2106-update-index-assume-unchanged.sh
@@ -3,22 +3,26 @@
 test_description='git update-index --assume-unchanged test.
 '
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
-test_expect_success 'setup' \
-	': >file &&
-	 git add file &&
-	 git commit -m initial &&
-	 git branch other &&
-	 echo upstream >file &&
-	 git add file &&
-	 git commit -m upstream'
+test_expect_success 'setup' '
+	: >file &&
+	git add file &&
+	git commit -m initial &&
+	git branch other &&
+	echo upstream >file &&
+	git add file &&
+	git commit -m upstream
+'
 
-test_expect_success 'do not switch branches with dirty file' \
-	'git reset --hard &&
-	 git checkout other &&
-	 echo dirt >file &&
-	 git update-index --assume-unchanged file &&
-	 test_must_fail git checkout master'
+test_expect_success 'do not switch branches with dirty file' '
+	git reset --hard &&
+	git checkout other &&
+	echo dirt >file &&
+	git update-index --assume-unchanged file &&
+	test_must_fail git checkout - 2>err &&
+	test_grep overwritten err
+'
 
 test_done
diff --git a/t/t2107-update-index-basic.sh b/t/t2107-update-index-basic.sh
index a30b7ca..cc72ead 100755
--- a/t/t2107-update-index-basic.sh
+++ b/t/t2107-update-index-basic.sh
@@ -14,7 +14,7 @@ test_expect_success 'update-index --nonsense fails' '
 
 test_expect_success 'update-index --nonsense dumps usage' '
 	test_expect_code 129 git update-index --nonsense 2>err &&
-	test_i18ngrep "[Uu]sage: git update-index" err
+	test_grep "[Uu]sage: git update-index" err
 '
 
 test_expect_success 'update-index -h with corrupt index' '
@@ -25,7 +25,7 @@ test_expect_success 'update-index -h with corrupt index' '
 		>.git/index &&
 		test_expect_code 129 git update-index -h >usage 2>&1
 	) &&
-	test_i18ngrep "[Uu]sage: git update-index" broken/usage
+	test_grep "[Uu]sage: git update-index" broken/usage
 '
 
 test_expect_success '--cacheinfo complains of missing arguments' '
@@ -36,9 +36,14 @@ test_expect_success '--cacheinfo does not accept blob null sha1' '
 	echo content >file &&
 	git add file &&
 	git rev-parse :file >expect &&
-	test_must_fail git update-index --cacheinfo 100644 $ZERO_OID file &&
+	test_must_fail git update-index --verbose --cacheinfo 100644 $ZERO_OID file >out &&
 	git rev-parse :file >actual &&
-	test_cmp expect actual
+	test_cmp expect actual &&
+
+	cat >expect <<-\EOF &&
+	add '\''file'\''
+	EOF
+	test_cmp expect out
 '
 
 test_expect_success '--cacheinfo does not accept gitlink null sha1' '
@@ -59,9 +64,14 @@ test_expect_success '--cacheinfo mode,sha1,path (new syntax)' '
 	git rev-parse :file >actual &&
 	test_cmp expect actual &&
 
-	git update-index --add --cacheinfo "100644,$(cat expect),elif" &&
+	git update-index --add --verbose --cacheinfo "100644,$(cat expect),elif" >out &&
 	git rev-parse :elif >actual &&
-	test_cmp expect actual
+	test_cmp expect actual &&
+
+	cat >expect <<-\EOF &&
+	add '\''elif'\''
+	EOF
+	test_cmp expect out
 '
 
 test_expect_success '.lock files cleaned up' '
@@ -73,8 +83,9 @@ test_expect_success '.lock files cleaned up' '
 	cd repo &&
 	git config core.worktree ../../worktree &&
 	# --refresh triggers late setup_work_tree,
-	# active_cache_changed is zero, rollback_lock_file fails
-	git update-index --refresh &&
+	# the_index.cache_changed is zero, rollback_lock_file fails
+	git update-index --refresh --verbose >out &&
+	test_must_be_empty out &&
 	! test -f .git/index.lock
 	)
 '
@@ -83,7 +94,15 @@ test_expect_success '--chmod=+x and chmod=-x in the same argument list' '
 	>A &&
 	>B &&
 	git add A B &&
-	git update-index --chmod=+x A --chmod=-x B &&
+	git update-index --verbose --chmod=+x A --chmod=-x B >out &&
+	cat >expect <<-\EOF &&
+	add '\''A'\''
+	chmod +x '\''A'\''
+	add '\''B'\''
+	chmod -x '\''B'\''
+	EOF
+	test_cmp expect out &&
+
 	cat >expect <<-EOF &&
 	100755 $EMPTY_BLOB 0	A
 	100644 $EMPTY_BLOB 0	B
@@ -92,4 +111,35 @@ test_expect_success '--chmod=+x and chmod=-x in the same argument list' '
 	test_cmp expect actual
 '
 
+test_expect_success '--index-version' '
+	git commit --allow-empty -m snap &&
+	git reset --hard &&
+	git rm -f -r --cached . &&
+
+	# The default index version is 2 --- update this test
+	# when you change it in the code
+	git update-index --show-index-version >actual &&
+	echo 2 >expect &&
+	test_cmp expect actual &&
+
+	# The next test wants us to be using version 2
+	git update-index --index-version 2 &&
+
+	git update-index --index-version 4 --verbose >actual &&
+	echo "index-version: was 2, set to 4" >expect &&
+	test_cmp expect actual &&
+
+	git update-index --index-version 4 --verbose >actual &&
+	echo "index-version: was 4, set to 4" >expect &&
+	test_cmp expect actual &&
+
+	git update-index --index-version 2 --verbose >actual &&
+	echo "index-version: was 4, set to 2" >expect &&
+	test_cmp expect actual &&
+
+	# non-verbose should be silent
+	git update-index --index-version 4 >actual &&
+	test_must_be_empty actual
+'
+
 test_done
diff --git a/t/t2108-update-index-refresh-racy.sh b/t/t2108-update-index-refresh-racy.sh
new file mode 100755
index 0000000..bc5f288
--- /dev/null
+++ b/t/t2108-update-index-refresh-racy.sh
@@ -0,0 +1,64 @@
+#!/bin/sh
+
+test_description='update-index refresh tests related to racy timestamps'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+reset_files () {
+	echo content >file &&
+	echo content >other &&
+	test_set_magic_mtime file &&
+	test_set_magic_mtime other
+}
+
+update_assert_changed () {
+	test_set_magic_mtime .git/index &&
+	test_might_fail git update-index "$1" &&
+	! test_is_magic_mtime .git/index
+}
+
+test_expect_success 'setup' '
+	reset_files &&
+	# we are calling reset_files() a couple of times during tests;
+	# test-tool chmtime does not change the ctime; to not weaken
+	# or even break our tests, disable ctime-checks entirely
+	git config core.trustctime false &&
+	git add file other &&
+	git commit -m "initial import"
+'
+
+test_expect_success '--refresh has no racy timestamps to fix' '
+	reset_files &&
+	# set the index time far enough to the future;
+	# it must be at least 3 seconds for VFAT
+	test_set_magic_mtime .git/index +60 &&
+	git update-index --refresh &&
+	test_is_magic_mtime .git/index +60
+'
+
+test_expect_success '--refresh should fix racy timestamp' '
+	reset_files &&
+	update_assert_changed --refresh
+'
+
+test_expect_success '--really-refresh should fix racy timestamp' '
+	reset_files &&
+	update_assert_changed --really-refresh
+'
+
+test_expect_success '--refresh should fix racy timestamp if other file needs update' '
+	reset_files &&
+	echo content2 >other &&
+	test_set_magic_mtime other &&
+	update_assert_changed --refresh
+'
+
+test_expect_success '--refresh should fix racy timestamp if racy file needs update' '
+	reset_files &&
+	echo content2 >file &&
+	test_set_magic_mtime file &&
+	update_assert_changed --refresh
+'
+
+test_done
diff --git a/t/t2200-add-update.sh b/t/t2200-add-update.sh
index f764b7e..df235ac 100755
--- a/t/t2200-add-update.sh
+++ b/t/t2200-add-update.sh
@@ -14,6 +14,7 @@ only the updates to dir/sub.
 Also tested are "git add -u" without limiting, and "git add -u"
 without contents changes, and other conditions'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -40,20 +41,38 @@ test_expect_success update '
 '
 
 test_expect_success 'update noticed a removal' '
-	test "$(git ls-files dir1/sub1)" = ""
+	git ls-files dir1/sub1 >out &&
+	test_must_be_empty out
 '
 
 test_expect_success 'update touched correct path' '
-	test "$(git diff-files --name-status dir2/sub3)" = ""
+	git diff-files --name-status dir2/sub3 >out &&
+	test_must_be_empty out
 '
 
 test_expect_success 'update did not touch other tracked files' '
-	test "$(git diff-files --name-status check)" = "M	check" &&
-	test "$(git diff-files --name-status top)" = "M	top"
+	echo "M	check" >expect &&
+	git diff-files --name-status check >actual &&
+	test_cmp expect actual &&
+
+	echo "M	top" >expect &&
+	git diff-files --name-status top >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success 'update did not touch untracked files' '
-	test "$(git ls-files dir2/other)" = ""
+	git ls-files dir2/other >out &&
+	test_must_be_empty out
+'
+
+test_expect_success 'error out when passing untracked path' '
+	git reset --hard &&
+	echo content >>baz &&
+	echo content >>top &&
+	test_must_fail git add -u baz top 2>err &&
+	test_grep -e "error: pathspec .baz. did not match any file(s) known to git" err &&
+	git diff --cached --name-only >actual &&
+	test_must_be_empty actual
 '
 
 test_expect_success 'cache tree has not been corrupted' '
@@ -75,9 +94,8 @@ test_expect_success 'update from a subdirectory' '
 '
 
 test_expect_success 'change gets noticed' '
-
-	test "$(git diff-files --name-status dir1)" = ""
-
+	git diff-files --name-status dir1 >out &&
+	test_must_be_empty out
 '
 
 test_expect_success 'non-qualified update in subdir updates from the root' '
@@ -102,7 +120,8 @@ test_expect_success 'replace a file with a symlink' '
 test_expect_success 'add everything changed' '
 
 	git add -u &&
-	test -z "$(git diff-files)"
+	git diff-files >out &&
+	test_must_be_empty out
 
 '
 
@@ -110,7 +129,8 @@ test_expect_success 'touch and then add -u' '
 
 	touch check &&
 	git add -u &&
-	test -z "$(git diff-files)"
+	git diff-files >out &&
+	test_must_be_empty out
 
 '
 
@@ -118,7 +138,8 @@ test_expect_success 'touch and then add explicitly' '
 
 	touch check &&
 	git add check &&
-	test -z "$(git diff-files)"
+	git diff-files >out &&
+	test_must_be_empty out
 
 '
 
@@ -129,13 +150,16 @@ test_expect_success 'add -n -u should not add but just report' '
 		echo "remove '\''top'\''"
 	) >expect &&
 	before=$(git ls-files -s check top) &&
+	git count-objects -v >objects_before &&
 	echo changed >>check &&
 	rm -f top &&
 	git add -n -u >actual &&
 	after=$(git ls-files -s check top) &&
+	git count-objects -v >objects_after &&
 
 	test "$before" = "$after" &&
-	test_i18ncmp expect actual
+	test_cmp objects_before objects_after &&
+	test_cmp expect actual
 
 '
 
@@ -147,13 +171,13 @@ test_expect_success 'add -u resolves unmerged paths' '
 	{
 		for path in path1 path2
 		do
-			echo "100644 $one 1	$path"
-			echo "100644 $two 2	$path"
-			echo "100644 $three 3	$path"
-		done
-		echo "100644 $one 1	path3"
-		echo "100644 $one 1	path4"
-		echo "100644 $one 3	path5"
+			echo "100644 $one 1	$path" &&
+			echo "100644 $two 2	$path" &&
+			echo "100644 $three 3	$path" || return 1
+		done &&
+		echo "100644 $one 1	path3" &&
+		echo "100644 $one 1	path4" &&
+		echo "100644 $one 3	path5" &&
 		echo "100644 $one 3	path6"
 	} |
 	git update-index --index-info &&
@@ -170,8 +194,8 @@ test_expect_success 'add -u resolves unmerged paths' '
 	git add -u &&
 	git ls-files -s path1 path2 path3 path4 path5 path6 >actual &&
 	{
-		echo "100644 $three 0	path1"
-		echo "100644 $two 0	path3"
+		echo "100644 $three 0	path1" &&
+		echo "100644 $two 0	path3" &&
 		echo "100644 $two 0	path5"
 	} >expect &&
 	test_cmp expect actual
@@ -179,7 +203,19 @@ test_expect_success 'add -u resolves unmerged paths' '
 
 test_expect_success '"add -u non-existent" should fail' '
 	test_must_fail git add -u non-existent &&
-	! (git ls-files | grep "non-existent")
+	git ls-files >actual &&
+	! grep "non-existent" actual
+'
+
+test_expect_success '"commit -a" implies "add -u" if index becomes empty' '
+	git rm -rf \* &&
+	git commit -m clean-slate &&
+	test_commit file1 &&
+	rm file1.t &&
+	test_tick &&
+	git commit -a -m remove &&
+	git ls-tree HEAD: >out &&
+	test_must_be_empty out
 '
 
 test_done
diff --git a/t/t2201-add-update-typechange.sh b/t/t2201-add-update-typechange.sh
index a4eec0a..dba62d6 100755
--- a/t/t2201-add-update-typechange.sh
+++ b/t/t2201-add-update-typechange.sh
@@ -2,6 +2,7 @@
 
 test_description='more git add -u'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -97,17 +98,17 @@ test_expect_success modify '
 		"
 	} >expect &&
 	{
-		cat expect
-		echo ":100644 160000 $_empty $ZERO_OID T	yonk"
+		cat expect &&
+		echo ":100644 160000 $_empty $ZERO_OID T	yonk" &&
 		echo ":100644 000000 $_empty $ZERO_OID D	zifmia"
 	} >expect-files &&
 	{
-		cat expect
+		cat expect &&
 		echo ":000000 160000 $ZERO_OID $ZERO_OID A	yonk"
 	} >expect-index &&
 	{
-		echo "100644 $_empty 0	nitfol"
-		echo "160000 $yomin 0	yomin"
+		echo "100644 $_empty 0	nitfol" &&
+		echo "160000 $yomin 0	yomin" &&
 		echo "160000 $yonk 0	yonk"
 	} >expect-final
 '
diff --git a/t/t2202-add-addremove.sh b/t/t2202-add-addremove.sh
index 9ee6590..24c60bf 100755
--- a/t/t2202-add-addremove.sh
+++ b/t/t2202-add-addremove.sh
@@ -2,6 +2,7 @@
 
 test_description='git add --all'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
diff --git a/t/t2203-add-intent.sh b/t/t2203-add-intent.sh
index cf0175a..8fa44a9 100755
--- a/t/t2203-add-intent.sh
+++ b/t/t2203-add-intent.sh
@@ -2,6 +2,7 @@
 
 test_description='Intent to add'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'intent to add' '
@@ -116,7 +117,7 @@ test_expect_success 'cache-tree does not ignore dir that has i-t-a entries' '
 		mkdir 2 &&
 		for f in 1 2/1 2/2 3
 		do
-			echo "$f" >"$f"
+			echo "$f" >"$f" || return 1
 		done &&
 		git add 1 2/2 3 &&
 		git add -N 2/1 &&
@@ -172,7 +173,7 @@ test_expect_success 'rename detection finds the right names' '
 		git add -N third &&
 
 		git status | grep -v "^?" >actual.1 &&
-		test_i18ngrep "renamed: *first -> third" actual.1 &&
+		test_grep "renamed: *first -> third" actual.1 &&
 
 		git status --porcelain | grep -v "^?" >actual.2 &&
 		cat >expected.2 <<-\EOF &&
@@ -212,8 +213,8 @@ test_expect_success 'double rename detection in status' '
 		git add -N third &&
 
 		git status | grep -v "^?" >actual.1 &&
-		test_i18ngrep "renamed: *first -> second" actual.1 &&
-		test_i18ngrep "renamed: *second -> third" actual.1 &&
+		test_grep "renamed: *first -> second" actual.1 &&
+		test_grep "renamed: *second -> third" actual.1 &&
 
 		git status --porcelain | grep -v "^?" >actual.2 &&
 		cat >expected.2 <<-\EOF &&
diff --git a/t/t2204-add-ignored.sh b/t/t2204-add-ignored.sh
index 2e07365..b7cf1e4 100755
--- a/t/t2204-add-ignored.sh
+++ b/t/t2204-add-ignored.sh
@@ -2,6 +2,7 @@
 
 test_description='giving ignored paths to git add'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -35,7 +36,7 @@ do
 	'
 
 	test_expect_success "complaints for ignored $i output" '
-		test_i18ngrep -e "Use -f if" err
+		test_grep -e "Use -f if" err
 	'
 
 	test_expect_success "complaints for ignored $i with unignored file" '
@@ -45,7 +46,7 @@ do
 		test_must_be_empty out
 	'
 	test_expect_success "complaints for ignored $i with unignored file output" '
-		test_i18ngrep -e "Use -f if" err
+		test_grep -e "Use -f if" err
 	'
 done
 
@@ -64,7 +65,7 @@ do
 	test_expect_success "complaints for ignored $i in dir output" '
 		(
 			cd dir &&
-			test_i18ngrep -e "Use -f if" err
+			test_grep -e "Use -f if" err
 		)
 	'
 done
@@ -84,7 +85,7 @@ do
 	test_expect_success "complaints for ignored $i in sub output" '
 		(
 			cd sub &&
-			test_i18ngrep -e "Use -f if" err
+			test_grep -e "Use -f if" err
 		)
 	'
 done
diff --git a/t/t2205-add-worktree-config.sh b/t/t2205-add-worktree-config.sh
new file mode 100755
index 0000000..98265ba
--- /dev/null
+++ b/t/t2205-add-worktree-config.sh
@@ -0,0 +1,266 @@
+#!/bin/sh
+
+test_description='directory traversal respects user config
+
+This test verifies the traversal of the directory tree when the traversal begins
+outside the repository.  Two instances for which this can occur are tested:
+
+	1) The user manually sets the worktree.  For this instance, the test sets
+	   the worktree two levels above the `.git` directory and checks whether we
+	   are able to add to the index those files that are in either (1) the
+	   manually configured worktree directory or (2) the standard worktree
+	   location with respect to the `.git` directory (i.e. ensuring that the
+	   encountered `.git` directory is not treated as belonging to a foreign
+	   nested repository).
+	2) The user manually sets the `git_dir` while the working directory is
+	   outside the repository.  The test checks that files inside the
+	   repository can be added to the index.
+	'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+test_expect_success '1a: setup--config worktree' '
+	mkdir test1 &&
+	(
+	cd test1 &&
+	test_create_repo repo &&
+	git --git-dir="repo/.git" config core.worktree "$(pwd)" &&
+
+	mkdir -p outside-tracked outside-untracked &&
+	mkdir -p repo/inside-tracked repo/inside-untracked &&
+	>file-tracked &&
+	>file-untracked &&
+	>outside-tracked/file &&
+	>outside-untracked/file &&
+	>repo/file-tracked &&
+	>repo/file-untracked &&
+	>repo/inside-tracked/file &&
+	>repo/inside-untracked/file &&
+
+	cat >expect-tracked-unsorted <<-EOF &&
+	../file-tracked
+	../outside-tracked/file
+	file-tracked
+	inside-tracked/file
+	EOF
+
+	cat >expect-untracked-unsorted <<-EOF &&
+	../file-untracked
+	../outside-untracked/file
+	file-untracked
+	inside-untracked/file
+	EOF
+
+	cat >expect-all-dir-unsorted <<-EOF &&
+	../file-untracked
+	../file-tracked
+	../outside-untracked/
+	../outside-tracked/
+	./
+	EOF
+
+	cat expect-tracked-unsorted expect-untracked-unsorted >expect-all-unsorted &&
+
+	cat >.gitignore <<-EOF
+	.gitignore
+	actual-*
+	expect-*
+	EOF
+	)
+'
+
+test_expect_success '1b: pre-add all' '
+	(
+	cd test1 &&
+	local parent_dir="$(pwd)" &&
+	git -C repo ls-files -o --exclude-standard "$parent_dir" >actual-all-unsorted &&
+	sort actual-all-unsorted >actual-all &&
+	sort expect-all-unsorted >expect-all &&
+	test_cmp expect-all actual-all
+	)
+'
+
+test_expect_success '1c: pre-add dir all' '
+	(
+	cd test1 &&
+	local parent_dir="$(pwd)" &&
+	git -C repo ls-files -o --directory --exclude-standard "$parent_dir" >actual-all-dir-unsorted &&
+	sort actual-all-dir-unsorted >actual-all &&
+	sort expect-all-dir-unsorted >expect-all &&
+	test_cmp expect-all actual-all
+	)
+'
+
+test_expect_success '1d: post-add tracked' '
+	(
+	cd test1 &&
+	local parent_dir="$(pwd)" &&
+	(
+		cd repo &&
+		git add file-tracked &&
+		git add inside-tracked &&
+		git add ../outside-tracked &&
+		git add "$parent_dir/file-tracked" &&
+		git ls-files "$parent_dir" >../actual-tracked-unsorted
+	) &&
+	sort actual-tracked-unsorted >actual-tracked &&
+	sort expect-tracked-unsorted >expect-tracked &&
+	test_cmp expect-tracked actual-tracked
+	)
+'
+
+test_expect_success '1e: post-add untracked' '
+	(
+	cd test1 &&
+	local parent_dir="$(pwd)" &&
+	git -C repo ls-files -o --exclude-standard "$parent_dir" >actual-untracked-unsorted &&
+	sort actual-untracked-unsorted >actual-untracked &&
+	sort expect-untracked-unsorted >expect-untracked &&
+	test_cmp expect-untracked actual-untracked
+	)
+'
+
+test_expect_success '2a: setup--set git-dir' '
+	mkdir test2 &&
+	(
+	cd test2 &&
+	test_create_repo repo &&
+	# create two foreign repositories that should remain untracked
+	test_create_repo repo-outside &&
+	test_create_repo repo/repo-inside &&
+
+	mkdir -p repo/inside-tracked repo/inside-untracked &&
+	>repo/file-tracked &&
+	>repo/file-untracked &&
+	>repo/inside-tracked/file &&
+	>repo/inside-untracked/file &&
+	>repo-outside/file &&
+	>repo/repo-inside/file &&
+
+	cat >expect-tracked-unsorted <<-EOF &&
+	repo/file-tracked
+	repo/inside-tracked/file
+	EOF
+
+	cat >expect-untracked-unsorted <<-EOF &&
+	repo/file-untracked
+	repo/inside-untracked/file
+	repo/repo-inside/
+	repo-outside/
+	EOF
+
+	cat >expect-all-dir-unsorted <<-EOF &&
+	repo/
+	repo-outside/
+	EOF
+
+	cat expect-tracked-unsorted expect-untracked-unsorted >expect-all-unsorted &&
+
+	cat >.gitignore <<-EOF
+	.gitignore
+	actual-*
+	expect-*
+	EOF
+	)
+'
+
+test_expect_success '2b: pre-add all' '
+	(
+	cd test2 &&
+	git --git-dir=repo/.git ls-files -o --exclude-standard >actual-all-unsorted &&
+	sort actual-all-unsorted >actual-all &&
+	sort expect-all-unsorted >expect-all &&
+	test_cmp expect-all actual-all
+	)
+'
+
+test_expect_success '2c: pre-add dir all' '
+	(
+	cd test2 &&
+	git --git-dir=repo/.git ls-files -o --directory --exclude-standard >actual-all-dir-unsorted &&
+	sort actual-all-dir-unsorted >actual-all &&
+	sort expect-all-dir-unsorted >expect-all &&
+	test_cmp expect-all actual-all
+	)
+'
+
+test_expect_success '2d: post-add tracked' '
+	(
+	cd test2 &&
+	git --git-dir=repo/.git add repo/file-tracked &&
+	git --git-dir=repo/.git add repo/inside-tracked &&
+	git --git-dir=repo/.git ls-files >actual-tracked-unsorted &&
+	sort actual-tracked-unsorted >actual-tracked &&
+	sort expect-tracked-unsorted >expect-tracked &&
+	test_cmp expect-tracked actual-tracked
+	)
+'
+
+test_expect_success '2e: post-add untracked' '
+	(
+	cd test2 &&
+	git --git-dir=repo/.git ls-files -o --exclude-standard >actual-untracked-unsorted &&
+	sort actual-untracked-unsorted >actual-untracked &&
+	sort expect-untracked-unsorted >expect-untracked &&
+	test_cmp expect-untracked actual-untracked
+	)
+'
+
+test_expect_success '3a: setup--add repo dir' '
+	mkdir test3 &&
+	(
+	cd test3 &&
+	test_create_repo repo &&
+
+	mkdir -p repo/inside-tracked repo/inside-ignored &&
+	>repo/file-tracked &&
+	>repo/file-ignored &&
+	>repo/inside-tracked/file &&
+	>repo/inside-ignored/file &&
+
+	cat >.gitignore <<-EOF &&
+	.gitignore
+	actual-*
+	expect-*
+	*ignored
+	EOF
+
+	cat >expect-tracked-unsorted <<-EOF &&
+	repo/file-tracked
+	repo/inside-tracked/file
+	EOF
+
+	cat >expect-ignored-unsorted <<-EOF
+	repo/file-ignored
+	repo/inside-ignored/
+	.gitignore
+	actual-ignored-unsorted
+	expect-ignored-unsorted
+	expect-tracked-unsorted
+	EOF
+	)
+'
+
+test_expect_success '3b: ignored' '
+	(
+	cd test3 &&
+	git --git-dir=repo/.git ls-files -io --directory --exclude-standard >actual-ignored-unsorted &&
+	sort actual-ignored-unsorted >actual-ignored &&
+	sort expect-ignored-unsorted >expect-ignored &&
+	test_cmp expect-ignored actual-ignored
+	)
+'
+
+test_expect_success '3c: add repo' '
+	(
+	cd test3 &&
+	git --git-dir=repo/.git add repo &&
+	git --git-dir=repo/.git ls-files >actual-tracked-unsorted &&
+	sort actual-tracked-unsorted >actual-tracked &&
+	sort expect-tracked-unsorted >expect-tracked &&
+	test_cmp expect-tracked actual-tracked
+	)
+'
+
+test_done
diff --git a/t/t2300-cd-to-toplevel.sh b/t/t2300-cd-to-toplevel.sh
index c8de6d8..b40eeb2 100755
--- a/t/t2300-cd-to-toplevel.sh
+++ b/t/t2300-cd-to-toplevel.sh
@@ -2,6 +2,7 @@
 
 test_description='cd_to_toplevel'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 EXEC_PATH="$(git --exec-path)"
diff --git a/t/t2400-worktree-add.sh b/t/t2400-worktree-add.sh
index 5a74954..ba320dc 100755
--- a/t/t2400-worktree-add.sh
+++ b/t/t2400-worktree-add.sh
@@ -2,6 +2,10 @@
 
 test_description='test git worktree add'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_CREATE_REPO_NO_TEMPLATE=1
 . ./test-lib.sh
 
 . "$TEST_DIRECTORY"/lib-rebase.sh
@@ -12,12 +16,12 @@ test_expect_success 'setup' '
 
 test_expect_success '"add" an existing worktree' '
 	mkdir -p existing/subtree &&
-	test_must_fail git worktree add --detach existing master
+	test_must_fail git worktree add --detach existing main
 '
 
 test_expect_success '"add" an existing empty worktree' '
 	mkdir existing_empty &&
-	git worktree add --detach existing_empty master
+	git worktree add --detach existing_empty main
 '
 
 test_expect_success '"add" using shorthand - fails when no previous branch' '
@@ -29,7 +33,7 @@ test_expect_success '"add" using - shorthand' '
 	echo hello >myworld &&
 	git add myworld &&
 	git commit -m myworld &&
-	git checkout master &&
+	git checkout main &&
 	git worktree add short-hand - &&
 	echo refs/heads/newbranch >expect &&
 	git -C short-hand rev-parse --symbolic-full-name HEAD >actual &&
@@ -37,7 +41,7 @@ test_expect_success '"add" using - shorthand' '
 '
 
 test_expect_success '"add" refuses to checkout locked branch' '
-	test_must_fail git worktree add zere master &&
+	test_must_fail git worktree add zere main &&
 	! test -d zere &&
 	! test -d .git/worktrees/zere
 '
@@ -46,13 +50,13 @@ test_expect_success 'checking out paths not complaining about linked checkouts'
 	(
 	cd existing_empty &&
 	echo dirty >>init.t &&
-	git checkout master -- init.t
+	git checkout main -- init.t
 	)
 '
 
 test_expect_success '"add" worktree' '
 	git rev-parse HEAD >expect &&
-	git worktree add --detach here master &&
+	git worktree add --detach here main &&
 	(
 		cd here &&
 		test_cmp ../init.t init.t &&
@@ -64,16 +68,30 @@ test_expect_success '"add" worktree' '
 '
 
 test_expect_success '"add" worktree with lock' '
-	git rev-parse HEAD >expect &&
-	git worktree add --detach --lock here-with-lock master &&
+	git worktree add --detach --lock here-with-lock main &&
+	test_when_finished "git worktree unlock here-with-lock || :" &&
 	test -f .git/worktrees/here-with-lock/locked
 '
 
+test_expect_success '"add" worktree with lock and reason' '
+	lock_reason="why not" &&
+	git worktree add --detach --lock --reason "$lock_reason" here-with-lock-reason main &&
+	test_when_finished "git worktree unlock here-with-lock-reason || :" &&
+	test -f .git/worktrees/here-with-lock-reason/locked &&
+	echo "$lock_reason" >expect &&
+	test_cmp expect .git/worktrees/here-with-lock-reason/locked
+'
+
+test_expect_success '"add" worktree with reason but no lock' '
+	test_must_fail git worktree add --detach --reason "why not" here-with-reason-only main &&
+	test_path_is_missing .git/worktrees/here-with-reason-only/locked
+'
+
 test_expect_success '"add" worktree from a subdir' '
 	(
 		mkdir sub &&
 		cd sub &&
-		git worktree add --detach here master &&
+		git worktree add --detach here main &&
 		cd here &&
 		test_cmp ../../init.t init.t
 	)
@@ -82,19 +100,19 @@ test_expect_success '"add" worktree from a subdir' '
 test_expect_success '"add" from a linked checkout' '
 	(
 		cd here &&
-		git worktree add --detach nested-here master &&
+		git worktree add --detach nested-here main &&
 		cd nested-here &&
 		git fsck
 	)
 '
 
 test_expect_success '"add" worktree creating new branch' '
-	git worktree add -b newmaster there master &&
+	git worktree add -b newmain there main &&
 	(
 		cd there &&
 		test_cmp ../init.t init.t &&
 		git symbolic-ref HEAD >actual &&
-		echo refs/heads/newmaster >expect &&
+		echo refs/heads/newmain >expect &&
 		test_cmp expect actual &&
 		git fsck
 	)
@@ -103,7 +121,30 @@ test_expect_success '"add" worktree creating new branch' '
 test_expect_success 'die the same branch is already checked out' '
 	(
 		cd here &&
-		test_must_fail git checkout newmaster
+		test_must_fail git checkout newmain 2>actual &&
+		grep "already used by worktree at" actual
+	)
+'
+
+test_expect_success 'refuse to reset a branch in use elsewhere' '
+	(
+		cd here &&
+
+		# we know we are on detached HEAD but just in case ...
+		git checkout --detach HEAD &&
+		git rev-parse --verify HEAD >old.head &&
+
+		git rev-parse --verify refs/heads/newmain >old.branch &&
+		test_must_fail git checkout -B newmain 2>error &&
+		git rev-parse --verify refs/heads/newmain >new.branch &&
+		git rev-parse --verify HEAD >new.head &&
+
+		grep "already used by worktree at" error &&
+		test_cmp old.branch new.branch &&
+		test_cmp old.head new.head &&
+
+		# and we must be still on the same detached HEAD state
+		test_must_fail git symbolic-ref HEAD
 	)
 '
 
@@ -112,20 +153,20 @@ test_expect_success SYMLINKS 'die the same branch is already checked out (symlin
 	ref=$(git -C there symbolic-ref HEAD) &&
 	rm "$head" &&
 	ln -s "$ref" "$head" &&
-	test_must_fail git -C here checkout newmaster
+	test_must_fail git -C here checkout newmain
 '
 
 test_expect_success 'not die the same branch is already checked out' '
 	(
 		cd here &&
-		git worktree add --force anothernewmaster newmaster
+		git worktree add --force anothernewmain newmain
 	)
 '
 
 test_expect_success 'not die on re-checking out current branch' '
 	(
 		cd there &&
-		git checkout newmaster
+		git checkout newmain
 	)
 '
 
@@ -133,14 +174,14 @@ test_expect_success '"add" from a bare repo' '
 	(
 		git clone --bare . bare &&
 		cd bare &&
-		git worktree add -b bare-master ../there2 master
+		git worktree add -b bare-main ../there2 main
 	)
 '
 
 test_expect_success 'checkout from a bare repo without "add"' '
 	(
 		cd bare &&
-		test_must_fail git checkout master
+		test_must_fail git checkout main
 	)
 '
 
@@ -148,8 +189,62 @@ test_expect_success '"add" default branch of a bare repo' '
 	(
 		git clone --bare . bare2 &&
 		cd bare2 &&
-		git worktree add ../there3 master
-	)
+		git worktree add ../there3 main &&
+		cd ../there3 &&
+		# Simple check that a Git command does not
+		# immediately fail with the current setup
+		git status
+	) &&
+	cat >expect <<-EOF &&
+	init.t
+	EOF
+	ls there3 >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success '"add" to bare repo with worktree config' '
+	(
+		git clone --bare . bare3 &&
+		cd bare3 &&
+		git config extensions.worktreeconfig true &&
+
+		# Add config values that are erroneous to have in
+		# a config.worktree file outside of the main
+		# working tree, to check that Git filters them out
+		# when copying config during "git worktree add".
+		git config --worktree core.bare true &&
+		git config --worktree core.worktree "$(pwd)" &&
+
+		# We want to check that bogus.key is copied
+		git config --worktree bogus.key value &&
+		git config --unset core.bare &&
+		git worktree add ../there4 main &&
+		cd ../there4 &&
+
+		# Simple check that a Git command does not
+		# immediately fail with the current setup
+		git status &&
+		git worktree add --detach ../there5 &&
+		cd ../there5 &&
+		git status
+	) &&
+
+	# the worktree has the arbitrary value copied.
+	test_cmp_config -C there4 value bogus.key &&
+	test_cmp_config -C there5 value bogus.key &&
+
+	# however, core.bare and core.worktree were removed.
+	test_must_fail git -C there4 config core.bare &&
+	test_must_fail git -C there4 config core.worktree &&
+
+	cat >expect <<-EOF &&
+	init.t
+	EOF
+
+	ls there4 >actual &&
+	test_cmp expect actual &&
+	ls there5 >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success 'checkout with grafts' '
@@ -158,6 +253,7 @@ test_expect_success 'checkout with grafts' '
 	SHA1=$(git rev-parse HEAD) &&
 	test_commit def &&
 	test_commit xyz &&
+	mkdir .git/info &&
 	echo "$(git rev-parse HEAD) $SHA1" >.git/info/grafts &&
 	cat >expected <<-\EOF &&
 	xyz
@@ -165,7 +261,7 @@ test_expect_success 'checkout with grafts' '
 	EOF
 	git log --format=%s -2 >actual &&
 	test_cmp expected actual &&
-	git worktree add --detach grafted master &&
+	git worktree add --detach grafted main &&
 	git --git-dir=grafted/.git log --format=%s -2 >actual &&
 	test_cmp expected actual
 '
@@ -225,38 +321,146 @@ test_expect_success '"add" no auto-vivify with --detach and <branch> omitted' '
 	test_must_fail git -C mish/mash symbolic-ref HEAD
 '
 
-test_expect_success '"add" -b/-B mutually exclusive' '
-	test_must_fail git worktree add -b poodle -B poodle bamboo master
-'
-
-test_expect_success '"add" -b/--detach mutually exclusive' '
-	test_must_fail git worktree add -b poodle --detach bamboo master
-'
+# Helper function to test mutually exclusive options.
+#
+# Note: Quoted arguments containing spaces are not supported.
+test_wt_add_excl () {
+	local opts="$*" &&
+	test_expect_success "'worktree add' with '$opts' has mutually exclusive options" '
+		test_must_fail git worktree add $opts 2>actual &&
+		grep -E "fatal:( options)? .* cannot be used together" actual
+	'
+}
 
-test_expect_success '"add" -B/--detach mutually exclusive' '
-	test_must_fail git worktree add -B poodle --detach bamboo master
-'
+test_wt_add_excl -b poodle -B poodle bamboo main
+test_wt_add_excl -b poodle --detach bamboo main
+test_wt_add_excl -B poodle --detach bamboo main
+test_wt_add_excl --orphan --detach bamboo
+test_wt_add_excl --orphan --no-checkout bamboo
+test_wt_add_excl --orphan bamboo main
+test_wt_add_excl --orphan -b bamboo wtdir/ main
 
 test_expect_success '"add -B" fails if the branch is checked out' '
-	git rev-parse newmaster >before &&
-	test_must_fail git worktree add -B newmaster bamboo master &&
-	git rev-parse newmaster >after &&
+	git rev-parse newmain >before &&
+	test_must_fail git worktree add -B newmain bamboo main &&
+	git rev-parse newmain >after &&
 	test_cmp before after
 '
 
 test_expect_success 'add -B' '
-	git worktree add -B poodle bamboo2 master^ &&
+	git worktree add -B poodle bamboo2 main^ &&
 	git -C bamboo2 symbolic-ref HEAD >actual &&
 	echo refs/heads/poodle >expected &&
 	test_cmp expected actual &&
-	test_cmp_rev master^ poodle
+	test_cmp_rev main^ poodle
 '
 
 test_expect_success 'add --quiet' '
-	git worktree add --quiet another-worktree master 2>actual &&
+	test_when_finished "git worktree remove -f -f another-worktree" &&
+	git worktree add --quiet another-worktree main 2>actual &&
+	test_must_be_empty actual
+'
+
+test_expect_success 'add --quiet -b' '
+	test_when_finished "git branch -D quietnewbranch" &&
+	test_when_finished "git worktree remove -f -f another-worktree" &&
+	git worktree add --quiet -b quietnewbranch another-worktree 2>actual &&
 	test_must_be_empty actual
 '
 
+test_expect_success '"add --orphan"' '
+	test_when_finished "git worktree remove -f -f orphandir" &&
+	git worktree add --orphan -b neworphan orphandir &&
+	echo refs/heads/neworphan >expected &&
+	git -C orphandir symbolic-ref HEAD >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success '"add --orphan (no -b)"' '
+	test_when_finished "git worktree remove -f -f neworphan" &&
+	git worktree add --orphan neworphan &&
+	echo refs/heads/neworphan >expected &&
+	git -C neworphan symbolic-ref HEAD >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success '"add --orphan --quiet"' '
+	test_when_finished "git worktree remove -f -f orphandir" &&
+	git worktree add --quiet --orphan -b neworphan orphandir 2>log.actual &&
+	test_must_be_empty log.actual &&
+	echo refs/heads/neworphan >expected &&
+	git -C orphandir symbolic-ref HEAD >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success '"add --orphan" fails if the branch already exists' '
+	test_when_finished "git branch -D existingbranch" &&
+	git worktree add -b existingbranch orphandir main &&
+	git worktree remove orphandir &&
+	test_must_fail git worktree add --orphan -b existingbranch orphandir
+'
+
+test_expect_success '"add --orphan" with empty repository' '
+	test_when_finished "rm -rf empty_repo" &&
+	echo refs/heads/newbranch >expected &&
+	GIT_DIR="empty_repo" git init --bare &&
+	git -C empty_repo worktree add --orphan -b newbranch worktreedir &&
+	git -C empty_repo/worktreedir symbolic-ref HEAD >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success '"add" worktree with orphan branch and lock' '
+	git worktree add --lock --orphan -b orphanbr orphan-with-lock &&
+	test_when_finished "git worktree unlock orphan-with-lock || :" &&
+	test -f .git/worktrees/orphan-with-lock/locked
+'
+
+test_expect_success '"add" worktree with orphan branch, lock, and reason' '
+	lock_reason="why not" &&
+	git worktree add --detach --lock --reason "$lock_reason" orphan-with-lock-reason main &&
+	test_when_finished "git worktree unlock orphan-with-lock-reason || :" &&
+	test -f .git/worktrees/orphan-with-lock-reason/locked &&
+	echo "$lock_reason" >expect &&
+	test_cmp expect .git/worktrees/orphan-with-lock-reason/locked
+'
+
+# Note: Quoted arguments containing spaces are not supported.
+test_wt_add_orphan_hint () {
+	local context="$1" &&
+	local use_branch="$2" &&
+	shift 2 &&
+	local opts="$*" &&
+	test_expect_success "'worktree add' show orphan hint in bad/orphan HEAD w/ $context" '
+		test_when_finished "rm -rf repo" &&
+		git init repo &&
+		(cd repo && test_commit commit) &&
+		git -C repo switch --orphan noref &&
+		test_must_fail git -C repo worktree add $opts foobar/ 2>actual &&
+		! grep "error: unknown switch" actual &&
+		grep "hint: If you meant to create a worktree containing a new unborn branch" actual &&
+		if [ $use_branch -eq 1 ]
+		then
+			grep -E "^hint: +git worktree add --orphan -b [^ ]+ [^ ]+$" actual
+		else
+			grep -E "^hint: +git worktree add --orphan [^ ]+$" actual
+		fi
+
+	'
+}
+
+test_wt_add_orphan_hint 'no opts' 0
+test_wt_add_orphan_hint '-b' 1 -b foobar_branch
+test_wt_add_orphan_hint '-B' 1 -B foobar_branch
+
+test_expect_success "'worktree add' doesn't show orphan hint in bad/orphan HEAD w/ --quiet" '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	(cd repo && test_commit commit) &&
+	test_must_fail git -C repo worktree add --quiet foobar_branch foobar/ 2>actual &&
+	! grep "error: unknown switch" actual &&
+	! grep "hint: If you meant to create a worktree containing a new unborn branch" actual
+'
+
 test_expect_success 'local clone from linked checkout' '
 	git clone --local here here-clone &&
 	( cd here-clone && git fsck )
@@ -286,7 +490,8 @@ test_expect_success 'put a worktree under rebase' '
 		cd under-rebase &&
 		set_fake_editor &&
 		FAKE_LINES="edit 1" git rebase -i HEAD^ &&
-		git worktree list | grep "under-rebase.*detached HEAD"
+		git worktree list >actual &&
+		grep "under-rebase.*detached HEAD" actual
 	)
 '
 
@@ -327,7 +532,8 @@ test_expect_success 'checkout a branch under bisect' '
 		git bisect start &&
 		git bisect bad &&
 		git bisect good HEAD~2 &&
-		git worktree list | grep "under-bisect.*detached HEAD" &&
+		git worktree list >actual &&
+		grep "under-bisect.*detached HEAD" actual &&
 		test_must_fail git worktree add new-bisect under-bisect &&
 		! test -d new-bisect
 	)
@@ -348,24 +554,24 @@ test_branch_upstream () {
 
 test_expect_success '--track sets up tracking' '
 	test_when_finished rm -rf track &&
-	git worktree add --track -b track track master &&
-	test_branch_upstream track . master
+	git worktree add --track -b track track main &&
+	test_branch_upstream track . main
 '
 
 # setup remote repository $1 and repository $2 with $1 set up as
-# remote.  The remote has two branches, master and foo.
+# remote.  The remote has two branches, main and foo.
 setup_remote_repo () {
 	git init $1 &&
 	(
 		cd $1 &&
-		test_commit $1_master &&
+		test_commit $1_main &&
 		git checkout -b foo &&
 		test_commit upstream_foo
 	) &&
 	git init $2 &&
 	(
 		cd $2 &&
-		test_commit $2_master &&
+		test_commit $2_main &&
 		git remote add $1 ../$1 &&
 		git config remote.$1.fetch \
 			"refs/heads/*:refs/remotes/$1/*" &&
@@ -373,6 +579,14 @@ setup_remote_repo () {
 	)
 }
 
+test_expect_success '"add" <path> <remote/branch> w/ no HEAD' '
+	test_when_finished rm -rf repo_upstream repo_local foo &&
+	setup_remote_repo repo_upstream repo_local &&
+	git -C repo_local config --bool core.bare true &&
+	git -C repo_local branch -D main &&
+	git -C repo_local worktree add ./foo repo_upstream/foo
+'
+
 test_expect_success '--no-track avoids setting up tracking' '
 	test_when_finished rm -rf repo_upstream repo_local foo &&
 	setup_remote_repo repo_upstream repo_local &&
@@ -455,6 +669,35 @@ test_expect_success 'git worktree add --guess-remote sets up tracking' '
 		test_cmp_rev refs/remotes/repo_a/foo refs/heads/foo
 	)
 '
+test_expect_success 'git worktree add --guess-remote sets up tracking (quiet)' '
+	test_when_finished rm -rf repo_a repo_b foo &&
+	setup_remote_repo repo_a repo_b &&
+	(
+		cd repo_b &&
+		git worktree add --quiet --guess-remote ../foo 2>actual &&
+		test_must_be_empty actual
+	) &&
+	(
+		cd foo &&
+		test_branch_upstream foo repo_a foo &&
+		test_cmp_rev refs/remotes/repo_a/foo refs/heads/foo
+	)
+'
+
+test_expect_success 'git worktree --no-guess-remote (quiet)' '
+	test_when_finished rm -rf repo_a repo_b foo &&
+	setup_remote_repo repo_a repo_b &&
+	(
+		cd repo_b &&
+		git worktree add --quiet --no-guess-remote ../foo
+	) &&
+	(
+		cd foo &&
+		test_must_fail git config "branch.foo.remote" &&
+		test_must_fail git config "branch.foo.merge" &&
+		test_cmp_rev ! refs/remotes/repo_a/foo refs/heads/foo
+	)
+'
 
 test_expect_success 'git worktree add with worktree.guessRemote sets up tracking' '
 	test_when_finished rm -rf repo_a repo_b foo &&
@@ -487,11 +730,352 @@ test_expect_success 'git worktree --no-guess-remote option overrides config' '
 	)
 '
 
+test_dwim_orphan () {
+	local info_text="No possible source branch, inferring '--orphan'" &&
+	local fetch_error_text="fatal: No local or remote refs exist despite at least one remote" &&
+	local orphan_hint="hint: If you meant to create a worktree containing a new unborn branch" &&
+	local invalid_ref_regex="^fatal: invalid reference: " &&
+	local bad_combo_regex="^fatal: options '[-a-z]*' and '[-a-z]*' cannot be used together" &&
+
+	local git_ns="repo" &&
+	local dashc_args="-C $git_ns" &&
+	local use_cd=0 &&
+
+	local bad_head=0 &&
+	local empty_repo=1 &&
+	local local_ref=0 &&
+	local use_quiet=0 &&
+	local remote=0 &&
+	local remote_ref=0 &&
+	local use_detach=0 &&
+	local use_new_branch=0 &&
+
+	local outcome="$1" &&
+	local outcome_text &&
+	local success &&
+	shift &&
+	local args="" &&
+	local context="" &&
+	case "$outcome" in
+	"infer")
+		success=1 &&
+		outcome_text='"add" DWIM infer --orphan'
+		;;
+	"no_infer")
+		success=1 &&
+		outcome_text='"add" DWIM doesnt infer --orphan'
+		;;
+	"fetch_error")
+		success=0 &&
+		outcome_text='"add" error need fetch'
+		;;
+	"fatal_orphan_bad_combo")
+		success=0 &&
+		outcome_text='"add" error inferred "--orphan" gives illegal opts combo'
+		;;
+	"warn_bad_head")
+		success=0 &&
+		outcome_text='"add" error, warn on bad HEAD, hint use orphan'
+		;;
+	*)
+		echo "test_dwim_orphan(): invalid outcome: '$outcome'" >&2 &&
+		return 1
+		;;
+	esac &&
+	while [ $# -gt 0 ]
+	do
+		case "$1" in
+		# How and from where to create the worktree
+		"-C_repo")
+			use_cd=0 &&
+			git_ns="repo" &&
+			dashc_args="-C $git_ns" &&
+			context="$context, 'git -C repo'"
+			;;
+		"-C_wt")
+			use_cd=0 &&
+			git_ns="wt" &&
+			dashc_args="-C $git_ns" &&
+			context="$context, 'git -C wt'"
+			;;
+		"cd_repo")
+			use_cd=1 &&
+			git_ns="repo" &&
+			dashc_args="" &&
+			context="$context, 'cd repo && git'"
+			;;
+		"cd_wt")
+			use_cd=1 &&
+			git_ns="wt" &&
+			dashc_args="" &&
+			context="$context, 'cd wt && git'"
+			;;
+
+		# Bypass the "pull first" warning
+		"force")
+			args="$args --force" &&
+			context="$context, --force"
+			;;
+
+		# Try to use remote refs when DWIM
+		"guess_remote")
+			args="$args --guess-remote" &&
+			context="$context, --guess-remote"
+			;;
+		"no_guess_remote")
+			args="$args --no-guess-remote" &&
+			context="$context, --no-guess-remote"
+			;;
+
+		# Whether there is at least one local branch present
+		"local_ref")
+			empty_repo=0 &&
+			local_ref=1 &&
+			context="$context, >=1 local branches"
+			;;
+		"no_local_ref")
+			empty_repo=0 &&
+			context="$context, 0 local branches"
+			;;
+
+		# Whether the HEAD points at a valid ref (skip this opt when no refs)
+		"good_head")
+			# requires: local_ref
+			context="$context, valid HEAD"
+			;;
+		"bad_head")
+			bad_head=1 &&
+			context="$context, invalid (or orphan) HEAD"
+			;;
+
+		# Whether the code path is tested with the base add command, -b, or --detach
+		"no_-b")
+			use_new_branch=0 &&
+			context="$context, no --branch"
+			;;
+		"-b")
+			use_new_branch=1 &&
+			context="$context, --branch"
+			;;
+		"detach")
+			use_detach=1 &&
+			context="$context, --detach"
+			;;
+
+		# Whether to check that all output is suppressed (except errors)
+		# or that the output is as expected
+		"quiet")
+			use_quiet=1 &&
+			args="$args --quiet" &&
+			context="$context, --quiet"
+			;;
+		"no_quiet")
+			use_quiet=0 &&
+			context="$context, no --quiet (expect output)"
+			;;
+
+		# Whether there is at least one remote attached to the repo
+		"remote")
+			empty_repo=0 &&
+			remote=1 &&
+			context="$context, >=1 remotes"
+			;;
+		"no_remote")
+			empty_repo=0 &&
+			remote=0 &&
+			context="$context, 0 remotes"
+			;;
+
+		# Whether there is at least one valid remote ref
+		"remote_ref")
+			# requires: remote
+			empty_repo=0 &&
+			remote_ref=1 &&
+			context="$context, >=1 fetched remote branches"
+			;;
+		"no_remote_ref")
+			empty_repo=0 &&
+			remote_ref=0 &&
+			context="$context, 0 fetched remote branches"
+			;;
+
+		# Options or flags that become illegal when --orphan is inferred
+		"no_checkout")
+			args="$args --no-checkout" &&
+			context="$context, --no-checkout"
+			;;
+		"track")
+			args="$args --track" &&
+			context="$context, --track"
+			;;
+
+		# All other options are illegal
+		*)
+			echo "test_dwim_orphan(): invalid arg: '$1'" >&2 &&
+			return 1
+			;;
+		esac &&
+		shift
+	done &&
+	context="${context#', '}" &&
+	if [ $use_new_branch -eq 1 ]
+	then
+		args="$args -b foo"
+	elif [ $use_detach -eq 1 ]
+	then
+		args="$args --detach"
+	else
+		context="DWIM (no --branch), $context"
+	fi &&
+	if [ $empty_repo -eq 1 ]
+	then
+		context="empty repo, $context"
+	fi &&
+	args="$args ../foo" &&
+	context="${context%', '}" &&
+	test_expect_success "$outcome_text w/ $context" '
+		test_when_finished "rm -rf repo" &&
+		git init repo &&
+		if [ $local_ref -eq 1 ] && [ "$git_ns" = "repo" ]
+		then
+			(cd repo && test_commit commit) &&
+			if [ $bad_head -eq 1 ]
+			then
+				git -C repo symbolic-ref HEAD refs/heads/badbranch
+			fi
+		elif [ $local_ref -eq 1 ] && [ "$git_ns" = "wt" ]
+		then
+			test_when_finished "git -C repo worktree remove -f ../wt" &&
+			git -C repo worktree add --orphan -b main ../wt &&
+			(cd wt && test_commit commit) &&
+			if [ $bad_head -eq 1 ]
+			then
+				git -C wt symbolic-ref HEAD refs/heads/badbranch
+			fi
+		elif [ $local_ref -eq 0 ] && [ "$git_ns" = "wt" ]
+		then
+			test_when_finished "git -C repo worktree remove -f ../wt" &&
+			git -C repo worktree add --orphan -b orphanbranch ../wt
+		fi &&
+
+		if [ $remote -eq 1 ]
+		then
+			test_when_finished "rm -rf upstream" &&
+			git init upstream &&
+			(cd upstream && test_commit commit) &&
+			git -C upstream switch -c foo &&
+			git -C repo remote add upstream ../upstream
+		fi &&
+
+		if [ $remote_ref -eq 1 ]
+		then
+			git -C repo fetch
+		fi &&
+		if [ $success -eq 1 ]
+		then
+			test_when_finished git -C repo worktree remove ../foo
+		fi &&
+		(
+			if [ $use_cd -eq 1 ]
+			then
+				cd $git_ns
+			fi &&
+			if [ "$outcome" = "infer" ]
+			then
+				git $dashc_args worktree add $args 2>actual &&
+				if [ $use_quiet -eq 1 ]
+				then
+					test_must_be_empty actual
+				else
+					grep "$info_text" actual
+				fi
+			elif [ "$outcome" = "no_infer" ]
+			then
+				git $dashc_args worktree add $args 2>actual &&
+				if [ $use_quiet -eq 1 ]
+				then
+					test_must_be_empty actual
+				else
+					! grep "$info_text" actual
+				fi
+			elif [ "$outcome" = "fetch_error" ]
+			then
+				test_must_fail git $dashc_args worktree add $args 2>actual &&
+				grep "$fetch_error_text" actual
+			elif [ "$outcome" = "fatal_orphan_bad_combo" ]
+			then
+				test_must_fail git $dashc_args worktree add $args 2>actual &&
+				if [ $use_quiet -eq 1 ]
+				then
+					! grep "$info_text" actual
+				else
+					grep "$info_text" actual
+				fi &&
+				grep "$bad_combo_regex" actual
+			elif [ "$outcome" = "warn_bad_head" ]
+			then
+				test_must_fail git $dashc_args worktree add $args 2>actual &&
+				if [ $use_quiet -eq 1 ]
+				then
+					grep "$invalid_ref_regex" actual &&
+					! grep "$orphan_hint" actual
+				else
+					headpath=$(git $dashc_args rev-parse --path-format=absolute --git-path HEAD) &&
+					headcontents=$(cat "$headpath") &&
+					grep "HEAD points to an invalid (or orphaned) reference" actual &&
+					grep "HEAD path: .$headpath." actual &&
+					grep "HEAD contents: .$headcontents." actual &&
+					grep "$orphan_hint" actual &&
+					! grep "$info_text" actual
+				fi &&
+				grep "$invalid_ref_regex" actual
+			else
+				# Unreachable
+				false
+			fi
+		) &&
+		if [ $success -ne 1 ]
+		then
+			test_path_is_missing foo
+		fi
+	'
+}
+
+for quiet_mode in "no_quiet" "quiet"
+do
+	for changedir_type in "cd_repo" "cd_wt" "-C_repo" "-C_wt"
+	do
+		dwim_test_args="$quiet_mode $changedir_type"
+		test_dwim_orphan 'infer' $dwim_test_args no_-b
+		test_dwim_orphan 'no_infer' $dwim_test_args no_-b local_ref good_head
+		test_dwim_orphan 'infer' $dwim_test_args no_-b no_local_ref no_remote no_remote_ref no_guess_remote
+		test_dwim_orphan 'infer' $dwim_test_args no_-b no_local_ref remote no_remote_ref no_guess_remote
+		test_dwim_orphan 'fetch_error' $dwim_test_args no_-b no_local_ref remote no_remote_ref guess_remote
+		test_dwim_orphan 'infer' $dwim_test_args no_-b no_local_ref remote no_remote_ref guess_remote force
+		test_dwim_orphan 'no_infer' $dwim_test_args no_-b no_local_ref remote remote_ref guess_remote
+
+		test_dwim_orphan 'infer' $dwim_test_args -b
+		test_dwim_orphan 'no_infer' $dwim_test_args -b local_ref good_head
+		test_dwim_orphan 'infer' $dwim_test_args -b no_local_ref no_remote no_remote_ref no_guess_remote
+		test_dwim_orphan 'infer' $dwim_test_args -b no_local_ref remote no_remote_ref no_guess_remote
+		test_dwim_orphan 'infer' $dwim_test_args -b no_local_ref remote no_remote_ref guess_remote
+		test_dwim_orphan 'infer' $dwim_test_args -b no_local_ref remote remote_ref guess_remote
+
+		test_dwim_orphan 'warn_bad_head' $dwim_test_args no_-b local_ref bad_head
+		test_dwim_orphan 'warn_bad_head' $dwim_test_args -b local_ref bad_head
+		test_dwim_orphan 'warn_bad_head' $dwim_test_args detach local_ref bad_head
+	done
+
+	test_dwim_orphan 'fatal_orphan_bad_combo' $quiet_mode no_-b no_checkout
+	test_dwim_orphan 'fatal_orphan_bad_combo' $quiet_mode no_-b track
+	test_dwim_orphan 'fatal_orphan_bad_combo' $quiet_mode -b no_checkout
+	test_dwim_orphan 'fatal_orphan_bad_combo' $quiet_mode -b track
+done
+
 post_checkout_hook () {
-	gitdir=${1:-.git}
-	test_when_finished "rm -f $gitdir/hooks/post-checkout" &&
-	mkdir -p $gitdir/hooks &&
-	write_script $gitdir/hooks/post-checkout <<-\EOF
+	test_when_finished "rm -rf .git/hooks" &&
+	mkdir .git/hooks &&
+	test_hook -C "$1" post-checkout <<-\EOF
 	{
 		echo $*
 		git rev-parse --git-dir --show-toplevel
@@ -597,6 +1181,7 @@ test_expect_success '"add" should not fail because of another bad worktree' '
 '
 
 test_expect_success '"add" with uninitialized submodule, with submodule.recurse unset' '
+	test_config_global protocol.file.allow always &&
 	test_create_repo submodule &&
 	test_commit -C submodule first &&
 	test_create_repo project &&
@@ -612,6 +1197,7 @@ test_expect_success '"add" with uninitialized submodule, with submodule.recurse
 '
 
 test_expect_success '"add" with initialized submodule, with submodule.recurse unset' '
+	test_config_global protocol.file.allow always &&
 	git -C project-clone submodule update --init &&
 	git -C project-clone worktree add ../project-4
 '
diff --git a/t/t2401-worktree-prune.sh b/t/t2401-worktree-prune.sh
index a6ce7f5..71aa9bc 100755
--- a/t/t2401-worktree-prune.sh
+++ b/t/t2401-worktree-prune.sh
@@ -2,6 +2,10 @@
 
 test_description='prune $GIT_DIR/worktrees'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success initialize '
@@ -16,11 +20,11 @@ test_expect_success 'worktree prune on normal repo' '
 test_expect_success 'prune files inside $GIT_DIR/worktrees' '
 	mkdir .git/worktrees &&
 	: >.git/worktrees/abc &&
-	git worktree prune --verbose >actual &&
+	git worktree prune --verbose 2>actual &&
 	cat >expect <<EOF &&
 Removing worktrees/abc: not a valid directory
 EOF
-	test_i18ncmp expect actual &&
+	test_cmp expect actual &&
 	! test -f .git/worktrees/abc &&
 	! test -d .git/worktrees
 '
@@ -31,8 +35,8 @@ test_expect_success 'prune directories without gitdir' '
 	cat >expect <<EOF &&
 Removing worktrees/def: gitdir file does not exist
 EOF
-	git worktree prune --verbose >actual &&
-	test_i18ncmp expect actual &&
+	git worktree prune --verbose 2>actual &&
+	test_cmp expect actual &&
 	! test -d .git/worktrees/def &&
 	! test -d .git/worktrees
 '
@@ -42,8 +46,8 @@ test_expect_success SANITY 'prune directories with unreadable gitdir' '
 	: >.git/worktrees/def/def &&
 	: >.git/worktrees/def/gitdir &&
 	chmod u-r .git/worktrees/def/gitdir &&
-	git worktree prune --verbose >actual &&
-	test_i18ngrep "Removing worktrees/def: unable to read gitdir file" actual &&
+	git worktree prune --verbose 2>actual &&
+	test_grep "Removing worktrees/def: unable to read gitdir file" actual &&
 	! test -d .git/worktrees/def &&
 	! test -d .git/worktrees
 '
@@ -52,8 +56,8 @@ test_expect_success 'prune directories with invalid gitdir' '
 	mkdir -p .git/worktrees/def/abc &&
 	: >.git/worktrees/def/def &&
 	: >.git/worktrees/def/gitdir &&
-	git worktree prune --verbose >actual &&
-	test_i18ngrep "Removing worktrees/def: invalid gitdir file" actual &&
+	git worktree prune --verbose 2>actual &&
+	test_grep "Removing worktrees/def: invalid gitdir file" actual &&
 	! test -d .git/worktrees/def &&
 	! test -d .git/worktrees
 '
@@ -62,8 +66,8 @@ test_expect_success 'prune directories with gitdir pointing to nowhere' '
 	mkdir -p .git/worktrees/def/abc &&
 	: >.git/worktrees/def/def &&
 	echo "$(pwd)"/nowhere >.git/worktrees/def/gitdir &&
-	git worktree prune --verbose >actual &&
-	test_i18ngrep "Removing worktrees/def: gitdir file points to non-existent location" actual &&
+	git worktree prune --verbose 2>actual &&
+	test_grep "Removing worktrees/def: gitdir file points to non-existent location" actual &&
 	! test -d .git/worktrees/def &&
 	! test -d .git/worktrees
 '
@@ -87,7 +91,7 @@ test_expect_success 'not prune recent checkouts' '
 
 test_expect_success 'not prune proper checkouts' '
 	test_when_finished rm -r .git/worktrees &&
-	git worktree add --detach "$PWD/nop" master &&
+	git worktree add --detach "$PWD/nop" main &&
 	git worktree prune &&
 	test -d .git/worktrees/nop
 '
@@ -98,8 +102,8 @@ test_expect_success 'prune duplicate (linked/linked)' '
 	git worktree add --detach w2 &&
 	sed "s/w2/w1/" .git/worktrees/w2/gitdir >.git/worktrees/w2/gitdir.new &&
 	mv .git/worktrees/w2/gitdir.new .git/worktrees/w2/gitdir &&
-	git worktree prune --verbose >actual &&
-	test_i18ngrep "duplicate entry" actual &&
+	git worktree prune --verbose 2>actual &&
+	test_grep "duplicate entry" actual &&
 	test -d .git/worktrees/w1 &&
 	! test -d .git/worktrees/w2
 '
@@ -111,8 +115,8 @@ test_expect_success 'prune duplicate (main/linked)' '
 	git -C repo worktree add --detach ../wt &&
 	rm -fr wt &&
 	mv repo wt &&
-	git -C wt worktree prune --verbose >actual &&
-	test_i18ngrep "duplicate entry" actual &&
+	git -C wt worktree prune --verbose 2>actual &&
+	test_grep "duplicate entry" actual &&
 	! test -d .git/worktrees/wt
 '
 
diff --git a/t/t2402-worktree-list.sh b/t/t2402-worktree-list.sh
index 52585ec..33ea9cb 100755
--- a/t/t2402-worktree-list.sh
+++ b/t/t2402-worktree-list.sh
@@ -2,6 +2,10 @@
 
 test_description='test git worktree list'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -21,7 +25,7 @@ test_expect_success 'rev-parse --git-common-dir on main worktree' '
 test_expect_success 'rev-parse --git-path objects linked worktree' '
 	echo "$(git rev-parse --show-toplevel)/.git/objects" >expect &&
 	test_when_finished "rm -rf linked-tree actual expect && git worktree prune" &&
-	git worktree add --detach linked-tree master &&
+	git worktree add --detach linked-tree main &&
 	git -C linked-tree rev-parse --git-path objects >actual &&
 	test_cmp expect actual
 '
@@ -29,7 +33,7 @@ test_expect_success 'rev-parse --git-path objects linked worktree' '
 test_expect_success '"list" all worktrees from main' '
 	echo "$(git rev-parse --show-toplevel) $(git rev-parse --short HEAD) [$(git symbolic-ref --short HEAD)]" >expect &&
 	test_when_finished "rm -rf here out actual expect && git worktree prune" &&
-	git worktree add --detach here master &&
+	git worktree add --detach here main &&
 	echo "$(git -C here rev-parse --show-toplevel) $(git rev-parse --short HEAD) (detached HEAD)" >>expect &&
 	git worktree list >out &&
 	sed "s/  */ /g" <out >actual &&
@@ -39,7 +43,7 @@ test_expect_success '"list" all worktrees from main' '
 test_expect_success '"list" all worktrees from linked' '
 	echo "$(git rev-parse --show-toplevel) $(git rev-parse --short HEAD) [$(git symbolic-ref --short HEAD)]" >expect &&
 	test_when_finished "rm -rf here out actual expect && git worktree prune" &&
-	git worktree add --detach here master &&
+	git worktree add --detach here main &&
 	echo "$(git -C here rev-parse --show-toplevel) $(git rev-parse --short HEAD) (detached HEAD)" >>expect &&
 	git -C here worktree list >out &&
 	sed "s/  */ /g" <out >actual &&
@@ -52,7 +56,7 @@ test_expect_success '"list" all worktrees --porcelain' '
 	echo "branch $(git symbolic-ref HEAD)" >>expect &&
 	echo >>expect &&
 	test_when_finished "rm -rf here actual expect && git worktree prune" &&
-	git worktree add --detach here master &&
+	git worktree add --detach here main &&
 	echo "worktree $(git -C here rev-parse --show-toplevel)" >>expect &&
 	echo "HEAD $(git rev-parse HEAD)" >>expect &&
 	echo "detached" >>expect &&
@@ -61,18 +65,143 @@ test_expect_success '"list" all worktrees --porcelain' '
 	test_cmp expect actual
 '
 
+test_expect_success '"list" all worktrees --porcelain -z' '
+	test_when_finished "rm -rf here _actual actual expect &&
+				git worktree prune" &&
+	printf "worktree %sQHEAD %sQbranch %sQQ" \
+		"$(git rev-parse --show-toplevel)" \
+		$(git rev-parse HEAD --symbolic-full-name HEAD) >expect &&
+	git worktree add --detach here main &&
+	printf "worktree %sQHEAD %sQdetachedQQ" \
+		"$(git -C here rev-parse --show-toplevel)" \
+		"$(git rev-parse HEAD)" >>expect &&
+	git worktree list --porcelain -z >_actual &&
+	nul_to_q <_actual >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success '"list" -z fails without --porcelain' '
+	test_must_fail git worktree list -z
+'
+
+test_expect_success '"list" all worktrees with locked annotation' '
+	test_when_finished "rm -rf locked unlocked out && git worktree prune" &&
+	git worktree add --detach locked main &&
+	git worktree add --detach unlocked main &&
+	git worktree lock locked &&
+	test_when_finished "git worktree unlock locked" &&
+	git worktree list >out &&
+	grep "/locked  *[0-9a-f].* locked$" out &&
+	! grep "/unlocked  *[0-9a-f].* locked$" out
+'
+
+test_expect_success '"list" all worktrees --porcelain with locked' '
+	test_when_finished "rm -rf locked1 locked2 unlocked out actual expect && git worktree prune" &&
+	echo "locked" >expect &&
+	echo "locked with reason" >>expect &&
+	git worktree add --detach locked1 &&
+	git worktree add --detach locked2 &&
+	# unlocked worktree should not be annotated with "locked"
+	git worktree add --detach unlocked &&
+	git worktree lock locked1 &&
+	test_when_finished "git worktree unlock locked1" &&
+	git worktree lock locked2 --reason "with reason" &&
+	test_when_finished "git worktree unlock locked2" &&
+	git worktree list --porcelain >out &&
+	grep "^locked" out >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success '"list" all worktrees --porcelain with locked reason newline escaped' '
+	test_when_finished "rm -rf locked_lf locked_crlf out actual expect && git worktree prune" &&
+	printf "locked \"locked\\\\r\\\\nreason\"\n" >expect &&
+	printf "locked \"locked\\\\nreason\"\n" >>expect &&
+	git worktree add --detach locked_lf &&
+	git worktree add --detach locked_crlf &&
+	git worktree lock locked_lf --reason "$(printf "locked\nreason")" &&
+	test_when_finished "git worktree unlock locked_lf" &&
+	git worktree lock locked_crlf --reason "$(printf "locked\r\nreason")" &&
+	test_when_finished "git worktree unlock locked_crlf" &&
+	git worktree list --porcelain >out &&
+	grep "^locked" out >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success '"list" all worktrees with prunable annotation' '
+	test_when_finished "rm -rf prunable unprunable out && git worktree prune" &&
+	git worktree add --detach prunable &&
+	git worktree add --detach unprunable &&
+	rm -rf prunable &&
+	git worktree list >out &&
+	grep "/prunable  *[0-9a-f].* prunable$" out &&
+	! grep "/unprunable  *[0-9a-f].* prunable$"
+'
+
+test_expect_success '"list" all worktrees --porcelain with prunable' '
+	test_when_finished "rm -rf prunable out && git worktree prune" &&
+	git worktree add --detach prunable &&
+	rm -rf prunable &&
+	git worktree list --porcelain >out &&
+	sed -n "/^worktree .*\/prunable$/,/^$/p" <out >only_prunable &&
+	test_grep "^prunable gitdir file points to non-existent location$" only_prunable
+'
+
+test_expect_success '"list" all worktrees with prunable consistent with "prune"' '
+	test_when_finished "rm -rf prunable unprunable out && git worktree prune" &&
+	git worktree add --detach prunable &&
+	git worktree add --detach unprunable &&
+	rm -rf prunable &&
+	git worktree list >out &&
+	grep "/prunable  *[0-9a-f].* prunable$" out &&
+	! grep "/unprunable  *[0-9a-f].* unprunable$" out &&
+	git worktree prune --verbose 2>out &&
+	test_grep "^Removing worktrees/prunable" out &&
+	test_grep ! "^Removing worktrees/unprunable" out
+'
+
+test_expect_success '"list" --verbose and --porcelain mutually exclusive' '
+	test_must_fail git worktree list --verbose --porcelain
+'
+
+test_expect_success '"list" all worktrees --verbose with locked' '
+	test_when_finished "rm -rf locked1 locked2 out actual expect && git worktree prune" &&
+	git worktree add locked1 --detach &&
+	git worktree add locked2 --detach &&
+	git worktree lock locked1 &&
+	test_when_finished "git worktree unlock locked1" &&
+	git worktree lock locked2 --reason "with reason" &&
+	test_when_finished "git worktree unlock locked2" &&
+	echo "$(git -C locked2 rev-parse --show-toplevel) $(git rev-parse --short HEAD) (detached HEAD)" >expect &&
+	printf "\tlocked: with reason\n" >>expect &&
+	git worktree list --verbose >out &&
+	grep "/locked1  *[0-9a-f].* locked$" out &&
+	sed -n "s/  */ /g;/\/locked2  *[0-9a-f].*$/,/locked: .*$/p" <out >actual &&
+	test_cmp actual expect
+'
+
+test_expect_success '"list" all worktrees --verbose with prunable' '
+	test_when_finished "rm -rf prunable out actual expect && git worktree prune" &&
+	git worktree add prunable --detach &&
+	echo "$(git -C prunable rev-parse --show-toplevel) $(git rev-parse --short HEAD) (detached HEAD)" >expect &&
+	printf "\tprunable: gitdir file points to non-existent location\n" >>expect &&
+	rm -rf prunable &&
+	git worktree list --verbose >out &&
+	sed -n "s/  */ /g;/\/prunable  *[0-9a-f].*$/,/prunable: .*$/p" <out >actual &&
+	test_cmp actual expect
+'
+
 test_expect_success 'bare repo setup' '
 	git init --bare bare1 &&
 	echo "data" >file1 &&
 	git add file1 &&
 	git commit -m"File1: add data" &&
-	git push bare1 master &&
+	git push bare1 main &&
 	git reset --hard HEAD^
 '
 
 test_expect_success '"list" all worktrees from bare main' '
 	test_when_finished "rm -rf there out actual expect && git -C bare1 worktree prune" &&
-	git -C bare1 worktree add --detach ../there master &&
+	git -C bare1 worktree add --detach ../there main &&
 	echo "$(pwd)/bare1 (bare)" >expect &&
 	echo "$(git -C there rev-parse --show-toplevel) $(git -C there rev-parse --short HEAD) (detached HEAD)" >>expect &&
 	git -C bare1 worktree list >out &&
@@ -82,7 +211,7 @@ test_expect_success '"list" all worktrees from bare main' '
 
 test_expect_success '"list" all worktrees --porcelain from bare main' '
 	test_when_finished "rm -rf there actual expect && git -C bare1 worktree prune" &&
-	git -C bare1 worktree add --detach ../there master &&
+	git -C bare1 worktree add --detach ../there main &&
 	echo "worktree $(pwd)/bare1" >expect &&
 	echo "bare" >>expect &&
 	echo >>expect &&
@@ -96,7 +225,7 @@ test_expect_success '"list" all worktrees --porcelain from bare main' '
 
 test_expect_success '"list" all worktrees from linked with a bare main' '
 	test_when_finished "rm -rf there out actual expect && git -C bare1 worktree prune" &&
-	git -C bare1 worktree add --detach ../there master &&
+	git -C bare1 worktree add --detach ../there main &&
 	echo "$(pwd)/bare1 (bare)" >expect &&
 	echo "$(git -C there rev-parse --show-toplevel) $(git -C there rev-parse --short HEAD) (detached HEAD)" >>expect &&
 	git -C there worktree list >out &&
@@ -121,7 +250,7 @@ test_expect_success 'broken main worktree still at the top' '
 		EOF
 		cd linked &&
 		echo "worktree $(pwd)" >expected &&
-		echo "ref: .broken" >../.git/HEAD &&
+		(cd ../ && test-tool ref-store main create-symref HEAD .broken ) &&
 		git worktree list --porcelain >out &&
 		head -n 3 out >actual &&
 		test_cmp ../expected actual &&
diff --git a/t/t2403-worktree-move.sh b/t/t2403-worktree-move.sh
index a4e1a17..901342e 100755
--- a/t/t2403-worktree-move.sh
+++ b/t/t2403-worktree-move.sh
@@ -2,6 +2,7 @@
 
 test_description='test git worktree move, remove, lock and unlock'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -138,7 +139,8 @@ test_expect_success 'move a repo with uninitialized submodule' '
 	(
 		cd withsub &&
 		test_commit initial &&
-		git submodule add "$PWD"/.git sub &&
+		git -c protocol.file.allow=always \
+			submodule add "$PWD"/.git sub &&
 		git commit -m withsub &&
 		git worktree add second HEAD &&
 		git worktree move second third
@@ -148,7 +150,7 @@ test_expect_success 'move a repo with uninitialized submodule' '
 test_expect_success 'not move a repo with initialized submodule' '
 	(
 		cd withsub &&
-		git -C third submodule update &&
+		git -c protocol.file.allow=always -C third submodule update &&
 		test_must_fail git worktree move third forth
 	)
 '
@@ -200,7 +202,7 @@ test_expect_success 'proper error when worktree not found' '
 	for i in noodle noodle/bork
 	do
 		test_must_fail git worktree lock $i 2>err &&
-		test_i18ngrep "not a working tree" err || return 1
+		test_grep "not a working tree" err || return 1
 	done
 '
 
@@ -227,6 +229,7 @@ test_expect_success 'remove cleans up .git/worktrees when empty' '
 '
 
 test_expect_success 'remove a repo with uninitialized submodule' '
+	test_config_global protocol.file.allow always &&
 	(
 		cd withsub &&
 		git worktree add to-remove HEAD &&
@@ -235,6 +238,7 @@ test_expect_success 'remove a repo with uninitialized submodule' '
 '
 
 test_expect_success 'not remove a repo with initialized submodule' '
+	test_config_global protocol.file.allow always &&
 	(
 		cd withsub &&
 		git worktree add to-remove HEAD &&
diff --git a/t/t2404-worktree-config.sh b/t/t2404-worktree-config.sh
index 9536d10..842937b 100755
--- a/t/t2404-worktree-config.sh
+++ b/t/t2404-worktree-config.sh
@@ -2,6 +2,7 @@
 
 test_description="config file in multi worktree"
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
diff --git a/t/t2405-worktree-submodule.sh b/t/t2405-worktree-submodule.sh
index e1b2bfd..11018f3 100755
--- a/t/t2405-worktree-submodule.sh
+++ b/t/t2405-worktree-submodule.sh
@@ -2,11 +2,15 @@
 
 test_description='Combination of submodules and multiple worktrees'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 base_path=$(pwd -P)
 
 test_expect_success 'setup: create origin repos'  '
+	git config --global protocol.file.allow always &&
 	git init origin/sub &&
 	test_commit -C origin/sub file1 &&
 	git init origin/main &&
@@ -31,7 +35,7 @@ test_expect_success 'add superproject worktree' '
 '
 
 test_expect_failure 'submodule is checked out just after worktree add' '
-	git -C worktree diff --submodule master"^!" >out &&
+	git -C worktree diff --submodule main"^!" >out &&
 	grep "file1 updated" out
 '
 
@@ -41,7 +45,7 @@ test_expect_success 'add superproject worktree and initialize submodules' '
 '
 
 test_expect_success 'submodule is checked out just after submodule update in linked worktree' '
-	git -C worktree-submodule-update diff --submodule master"^!" >out &&
+	git -C worktree-submodule-update diff --submodule main"^!" >out &&
 	grep "file1 updated" out
 '
 
@@ -51,7 +55,7 @@ test_expect_success 'add superproject worktree and manually add submodule worktr
 '
 
 test_expect_success 'submodule is checked out after manually adding submodule worktree' '
-	git -C linked_submodule diff --submodule master"^!" >out &&
+	git -C linked_submodule diff --submodule main"^!" >out &&
 	grep "file1 updated" out
 '
 
diff --git a/t/t2406-worktree-repair.sh b/t/t2406-worktree-repair.sh
new file mode 100755
index 0000000..edbf502
--- /dev/null
+++ b/t/t2406-worktree-repair.sh
@@ -0,0 +1,200 @@
+#!/bin/sh
+
+test_description='test git worktree repair'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+test_expect_success setup '
+	test_commit init
+'
+
+test_expect_success 'skip missing worktree' '
+	test_when_finished "git worktree prune" &&
+	git worktree add --detach missing &&
+	rm -rf missing &&
+	git worktree repair >out 2>err &&
+	test_must_be_empty out &&
+	test_must_be_empty err
+'
+
+test_expect_success 'worktree path not directory' '
+	test_when_finished "git worktree prune" &&
+	git worktree add --detach notdir &&
+	rm -rf notdir &&
+	>notdir &&
+	test_must_fail git worktree repair >out 2>err &&
+	test_must_be_empty out &&
+	test_grep "not a directory" err
+'
+
+test_expect_success "don't clobber .git repo" '
+	test_when_finished "rm -rf repo && git worktree prune" &&
+	git worktree add --detach repo &&
+	rm -rf repo &&
+	test_create_repo repo &&
+	test_must_fail git worktree repair >out 2>err &&
+	test_must_be_empty out &&
+	test_grep ".git is not a file" err
+'
+
+test_corrupt_gitfile () {
+	butcher=$1 &&
+	problem=$2 &&
+	repairdir=${3:-.} &&
+	test_when_finished 'rm -rf corrupt && git worktree prune' &&
+	git worktree add --detach corrupt &&
+	git -C corrupt rev-parse --absolute-git-dir >expect &&
+	eval "$butcher" &&
+	git -C "$repairdir" worktree repair 2>err &&
+	test_grep "$problem" err &&
+	git -C corrupt rev-parse --absolute-git-dir >actual &&
+	test_cmp expect actual
+}
+
+test_expect_success 'repair missing .git file' '
+	test_corrupt_gitfile "rm -f corrupt/.git" ".git file broken"
+'
+
+test_expect_success 'repair bogus .git file' '
+	test_corrupt_gitfile "echo \"gitdir: /nowhere\" >corrupt/.git" \
+		".git file broken"
+'
+
+test_expect_success 'repair incorrect .git file' '
+	test_when_finished "rm -rf other && git worktree prune" &&
+	test_create_repo other &&
+	other=$(git -C other rev-parse --absolute-git-dir) &&
+	test_corrupt_gitfile "echo \"gitdir: $other\" >corrupt/.git" \
+		".git file incorrect"
+'
+
+test_expect_success 'repair .git file from main/.git' '
+	test_corrupt_gitfile "rm -f corrupt/.git" ".git file broken" .git
+'
+
+test_expect_success 'repair .git file from linked worktree' '
+	test_when_finished "rm -rf other && git worktree prune" &&
+	git worktree add --detach other &&
+	test_corrupt_gitfile "rm -f corrupt/.git" ".git file broken" other
+'
+
+test_expect_success 'repair .git file from bare.git' '
+	test_when_finished "rm -rf bare.git corrupt && git worktree prune" &&
+	git clone --bare . bare.git &&
+	git -C bare.git worktree add --detach ../corrupt &&
+	git -C corrupt rev-parse --absolute-git-dir >expect &&
+	rm -f corrupt/.git &&
+	git -C bare.git worktree repair &&
+	git -C corrupt rev-parse --absolute-git-dir >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'invalid worktree path' '
+	test_must_fail git worktree repair /notvalid >out 2>err &&
+	test_must_be_empty out &&
+	test_grep "not a valid path" err
+'
+
+test_expect_success 'repo not found; .git not file' '
+	test_when_finished "rm -rf not-a-worktree" &&
+	test_create_repo not-a-worktree &&
+	test_must_fail git worktree repair not-a-worktree >out 2>err &&
+	test_must_be_empty out &&
+	test_grep ".git is not a file" err
+'
+
+test_expect_success 'repo not found; .git not referencing repo' '
+	test_when_finished "rm -rf side not-a-repo && git worktree prune" &&
+	git worktree add --detach side &&
+	sed s,\.git/worktrees/side$,not-a-repo, side/.git >side/.newgit &&
+	mv side/.newgit side/.git &&
+	mkdir not-a-repo &&
+	test_must_fail git worktree repair side 2>err &&
+	test_grep ".git file does not reference a repository" err
+'
+
+test_expect_success 'repo not found; .git file broken' '
+	test_when_finished "rm -rf orig moved && git worktree prune" &&
+	git worktree add --detach orig &&
+	echo /invalid >orig/.git &&
+	mv orig moved &&
+	test_must_fail git worktree repair moved >out 2>err &&
+	test_must_be_empty out &&
+	test_grep ".git file broken" err
+'
+
+test_expect_success 'repair broken gitdir' '
+	test_when_finished "rm -rf orig moved && git worktree prune" &&
+	git worktree add --detach orig &&
+	sed s,orig/\.git$,moved/.git, .git/worktrees/orig/gitdir >expect &&
+	rm .git/worktrees/orig/gitdir &&
+	mv orig moved &&
+	git worktree repair moved 2>err &&
+	test_cmp expect .git/worktrees/orig/gitdir &&
+	test_grep "gitdir unreadable" err
+'
+
+test_expect_success 'repair incorrect gitdir' '
+	test_when_finished "rm -rf orig moved && git worktree prune" &&
+	git worktree add --detach orig &&
+	sed s,orig/\.git$,moved/.git, .git/worktrees/orig/gitdir >expect &&
+	mv orig moved &&
+	git worktree repair moved 2>err &&
+	test_cmp expect .git/worktrees/orig/gitdir &&
+	test_grep "gitdir incorrect" err
+'
+
+test_expect_success 'repair gitdir (implicit) from linked worktree' '
+	test_when_finished "rm -rf orig moved && git worktree prune" &&
+	git worktree add --detach orig &&
+	sed s,orig/\.git$,moved/.git, .git/worktrees/orig/gitdir >expect &&
+	mv orig moved &&
+	git -C moved worktree repair 2>err &&
+	test_cmp expect .git/worktrees/orig/gitdir &&
+	test_grep "gitdir incorrect" err
+'
+
+test_expect_success 'unable to repair gitdir (implicit) from main worktree' '
+	test_when_finished "rm -rf orig moved && git worktree prune" &&
+	git worktree add --detach orig &&
+	cat .git/worktrees/orig/gitdir >expect &&
+	mv orig moved &&
+	git worktree repair 2>err &&
+	test_cmp expect .git/worktrees/orig/gitdir &&
+	test_must_be_empty err
+'
+
+test_expect_success 'repair multiple gitdir files' '
+	test_when_finished "rm -rf orig1 orig2 moved1 moved2 &&
+		git worktree prune" &&
+	git worktree add --detach orig1 &&
+	git worktree add --detach orig2 &&
+	sed s,orig1/\.git$,moved1/.git, .git/worktrees/orig1/gitdir >expect1 &&
+	sed s,orig2/\.git$,moved2/.git, .git/worktrees/orig2/gitdir >expect2 &&
+	mv orig1 moved1 &&
+	mv orig2 moved2 &&
+	git worktree repair moved1 moved2 2>err &&
+	test_cmp expect1 .git/worktrees/orig1/gitdir &&
+	test_cmp expect2 .git/worktrees/orig2/gitdir &&
+	test_grep "gitdir incorrect:.*orig1/gitdir$" err &&
+	test_grep "gitdir incorrect:.*orig2/gitdir$" err
+'
+
+test_expect_success 'repair moved main and linked worktrees' '
+	test_when_finished "rm -rf main side mainmoved sidemoved" &&
+	test_create_repo main &&
+	test_commit -C main init &&
+	git -C main worktree add --detach ../side &&
+	sed "s,side/\.git$,sidemoved/.git," \
+		main/.git/worktrees/side/gitdir >expect-gitdir &&
+	sed "s,main/.git/worktrees/side$,mainmoved/.git/worktrees/side," \
+		side/.git >expect-gitfile &&
+	mv main mainmoved &&
+	mv side sidemoved &&
+	git -C mainmoved worktree repair ../sidemoved &&
+	test_cmp expect-gitdir mainmoved/.git/worktrees/side/gitdir &&
+	test_cmp expect-gitfile sidemoved/.git
+'
+
+test_done
diff --git a/t/t2407-worktree-heads.sh b/t/t2407-worktree-heads.sh
new file mode 100755
index 0000000..f6835c9
--- /dev/null
+++ b/t/t2407-worktree-heads.sh
@@ -0,0 +1,180 @@
+#!/bin/sh
+
+test_description='test operations trying to overwrite refs at worktree HEAD'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+test_expect_success 'setup' '
+	test_commit init &&
+
+	for i in 1 2 3 4
+	do
+		git checkout -b conflict-$i &&
+		echo "not I" >$i.t &&
+		git add $i.t &&
+		git commit -m "will conflict" &&
+
+		git checkout - &&
+		test_commit $i &&
+		git branch wt-$i &&
+		git branch fake-$i &&
+		git worktree add wt-$i wt-$i || return 1
+	done &&
+
+	# Create a server that updates each branch by one commit
+	git init server &&
+	test_commit -C server initial &&
+	git remote add server ./server &&
+	for i in 1 2 3 4
+	do
+		git -C server checkout -b wt-$i &&
+		test_commit -C server A-$i || return 1
+	done &&
+	for i in 1 2
+	do
+		git -C server checkout -b fake-$i &&
+		test_commit -C server f-$i || return 1
+	done
+'
+
+test_expect_success 'refuse to overwrite: checked out in worktree' '
+	for i in 1 2 3 4
+	do
+		test_must_fail git branch -f wt-$i HEAD 2>err &&
+		grep "cannot force update the branch" err &&
+
+		test_must_fail git branch -D wt-$i 2>err &&
+		grep "cannot delete branch" err || return 1
+	done
+'
+
+test_expect_success !SANITIZE_LEAK 'refuse to overwrite: worktree in bisect' '
+	test_when_finished git -C wt-4 bisect reset &&
+
+	# Set up a bisect so HEAD no longer points to wt-4.
+	git -C wt-4 bisect start &&
+	git -C wt-4 bisect bad wt-4 &&
+	git -C wt-4 bisect good wt-1 &&
+
+	test_must_fail git branch -f wt-4 HEAD 2>err &&
+	grep "cannot force update the branch '\''wt-4'\'' used by worktree at.*wt-4" err
+'
+
+test_expect_success !SANITIZE_LEAK 'refuse to overwrite: worktree in rebase (apply)' '
+	test_when_finished git -C wt-2 rebase --abort &&
+
+	# This will fail part-way through due to a conflict.
+	test_must_fail git -C wt-2 rebase --apply conflict-2 &&
+
+	test_must_fail git branch -f wt-2 HEAD 2>err &&
+	grep "cannot force update the branch '\''wt-2'\'' used by worktree at.*wt-2" err
+'
+
+test_expect_success !SANITIZE_LEAK 'refuse to overwrite: worktree in rebase (merge)' '
+	test_when_finished git -C wt-2 rebase --abort &&
+
+	# This will fail part-way through due to a conflict.
+	test_must_fail git -C wt-2 rebase conflict-2 &&
+
+	test_must_fail git branch -f wt-2 HEAD 2>err &&
+	grep "cannot force update the branch '\''wt-2'\'' used by worktree at.*wt-2" err
+'
+
+test_expect_success !SANITIZE_LEAK 'refuse to overwrite: worktree in rebase with --update-refs' '
+	test_when_finished git -C wt-3 rebase --abort &&
+
+	git branch -f can-be-updated wt-3 &&
+	test_must_fail git -C wt-3 rebase --update-refs conflict-3 &&
+
+	for i in 3 4
+	do
+		test_must_fail git branch -f can-be-updated HEAD 2>err &&
+		grep "cannot force update the branch '\''can-be-updated'\'' used by worktree at.*wt-3" err ||
+			return 1
+	done
+'
+
+test_expect_success !SANITIZE_LEAK 'refuse to fetch over ref: checked out' '
+	test_must_fail git fetch server +refs/heads/wt-3:refs/heads/wt-3 2>err &&
+	grep "refusing to fetch into branch '\''refs/heads/wt-3'\''" err &&
+
+	# General fetch into refs/heads/ will fail on first ref,
+	# so use a generic error message check.
+	test_must_fail git fetch server +refs/heads/*:refs/heads/* 2>err &&
+	grep "refusing to fetch into branch" err
+'
+
+test_expect_success !SANITIZE_LEAK 'refuse to fetch over ref: worktree in bisect' '
+	test_when_finished git -C wt-4 bisect reset &&
+
+	# Set up a bisect so HEAD no longer points to wt-4.
+	git -C wt-4 bisect start &&
+	git -C wt-4 bisect bad wt-4 &&
+	git -C wt-4 bisect good wt-1 &&
+
+	test_must_fail git fetch server +refs/heads/wt-4:refs/heads/wt-4 2>err &&
+	grep "refusing to fetch into branch" err
+'
+
+test_expect_success !SANITIZE_LEAK 'refuse to fetch over ref: worktree in rebase' '
+	test_when_finished git -C wt-3 rebase --abort &&
+
+	# This will fail part-way through due to a conflict.
+	test_must_fail git -C wt-3 rebase conflict-3 &&
+
+	test_must_fail git fetch server +refs/heads/wt-3:refs/heads/wt-3 2>err &&
+	grep "refusing to fetch into branch" err
+'
+
+test_expect_success 'refuse to overwrite when in error states' '
+	test_when_finished rm -rf .git/worktrees/wt-*/rebase-merge &&
+	test_when_finished rm -rf .git/worktrees/wt-*/BISECT_* &&
+
+	# Both branches are currently under rebase.
+	mkdir -p .git/worktrees/wt-3/rebase-merge &&
+	touch .git/worktrees/wt-3/rebase-merge/interactive &&
+	echo refs/heads/fake-1 >.git/worktrees/wt-3/rebase-merge/head-name &&
+	echo refs/heads/fake-2 >.git/worktrees/wt-3/rebase-merge/onto &&
+	mkdir -p .git/worktrees/wt-4/rebase-merge &&
+	touch .git/worktrees/wt-4/rebase-merge/interactive &&
+	echo refs/heads/fake-2 >.git/worktrees/wt-4/rebase-merge/head-name &&
+	echo refs/heads/fake-1 >.git/worktrees/wt-4/rebase-merge/onto &&
+
+	# Both branches are currently under bisect.
+	touch .git/worktrees/wt-4/BISECT_LOG &&
+	echo refs/heads/fake-2 >.git/worktrees/wt-4/BISECT_START &&
+	touch .git/worktrees/wt-1/BISECT_LOG &&
+	echo refs/heads/fake-1 >.git/worktrees/wt-1/BISECT_START &&
+
+	for i in 1 2
+	do
+		test_must_fail git branch -f fake-$i HEAD 2>err &&
+		grep "cannot force update the branch '\''fake-$i'\'' used by worktree at" err ||
+			return 1
+	done
+'
+
+. "$TEST_DIRECTORY"/lib-rebase.sh
+
+test_expect_success !SANITIZE_LEAK 'refuse to overwrite during rebase with --update-refs' '
+	git commit --fixup HEAD~2 --allow-empty &&
+	(
+		set_cat_todo_editor &&
+		test_must_fail git rebase -i --update-refs HEAD~3 >todo &&
+		! grep "update-refs" todo
+	) &&
+	git branch -f allow-update HEAD~2 &&
+	(
+		set_cat_todo_editor &&
+		test_must_fail git rebase -i --update-refs HEAD~3 >todo &&
+		grep "update-ref refs/heads/allow-update" todo
+	)
+'
+
+# This must be the last test in this file
+test_expect_success '$EDITOR and friends are unchanged' '
+	test_editor_unchanged
+'
+
+test_done
diff --git a/t/t2500-untracked-overwriting.sh b/t/t2500-untracked-overwriting.sh
new file mode 100755
index 0000000..5c0bf4d
--- /dev/null
+++ b/t/t2500-untracked-overwriting.sh
@@ -0,0 +1,244 @@
+#!/bin/sh
+
+test_description='Test handling of overwriting untracked files'
+
+. ./test-lib.sh
+
+test_setup_reset () {
+	git init reset_$1 &&
+	(
+		cd reset_$1 &&
+		test_commit init &&
+
+		git branch stable &&
+		git branch work &&
+
+		git checkout work &&
+		test_commit foo &&
+
+		git checkout stable
+	)
+}
+
+test_expect_success 'reset --hard will nuke untracked files/dirs' '
+	test_setup_reset hard &&
+	(
+		cd reset_hard &&
+		git ls-tree -r stable &&
+		git log --all --name-status --oneline &&
+		git ls-tree -r work &&
+
+		mkdir foo.t &&
+		echo precious >foo.t/file &&
+		echo foo >expect &&
+
+		git reset --hard work &&
+
+		# check that untracked directory foo.t/ was nuked
+		test_path_is_file foo.t &&
+		test_cmp expect foo.t
+	)
+'
+
+test_expect_success 'reset --merge will preserve untracked files/dirs' '
+	test_setup_reset merge &&
+	(
+		cd reset_merge &&
+
+		mkdir foo.t &&
+		echo precious >foo.t/file &&
+		cp foo.t/file expect &&
+
+		test_must_fail git reset --merge work 2>error &&
+		test_cmp expect foo.t/file &&
+		grep "Updating .foo.t. would lose untracked files" error
+	)
+'
+
+test_expect_success 'reset --keep will preserve untracked files/dirs' '
+	test_setup_reset keep &&
+	(
+		cd reset_keep &&
+
+		mkdir foo.t &&
+		echo precious >foo.t/file &&
+		cp foo.t/file expect &&
+
+		test_must_fail git reset --merge work 2>error &&
+		test_cmp expect foo.t/file &&
+		grep "Updating.*foo.t.*would lose untracked files" error
+	)
+'
+
+test_setup_checkout_m () {
+	git init checkout &&
+	(
+		cd checkout &&
+		test_commit init &&
+
+		test_write_lines file has some >filler &&
+		git add filler &&
+		git commit -m filler &&
+
+		git branch stable &&
+
+		git switch -c work &&
+		echo stuff >notes.txt &&
+		test_write_lines file has some words >filler &&
+		git add notes.txt filler &&
+		git commit -m filler &&
+
+		git checkout stable
+	)
+}
+
+test_expect_success 'checkout -m does not nuke untracked file' '
+	test_setup_checkout_m &&
+	(
+		cd checkout &&
+
+		# Tweak filler
+		test_write_lines this file has some >filler &&
+		# Make an untracked file, save its contents in "expect"
+		echo precious >notes.txt &&
+		cp notes.txt expect &&
+
+		test_must_fail git checkout -m work &&
+		test_cmp expect notes.txt
+	)
+'
+
+test_setup_sequencing () {
+	git init sequencing_$1 &&
+	(
+		cd sequencing_$1 &&
+		test_commit init &&
+
+		test_write_lines this file has some words >filler &&
+		git add filler &&
+		git commit -m filler &&
+
+		mkdir -p foo/bar &&
+		test_commit foo/bar/baz &&
+
+		git branch simple &&
+		git branch fooey &&
+
+		git checkout fooey &&
+		git rm foo/bar/baz.t &&
+		echo stuff >>filler &&
+		git add -u &&
+		git commit -m "changes" &&
+
+		git checkout simple &&
+		echo items >>filler &&
+		echo newstuff >>newfile &&
+		git add filler newfile &&
+		git commit -m another
+	)
+}
+
+test_expect_success 'git rebase --abort and untracked files' '
+	test_setup_sequencing rebase_abort_and_untracked &&
+	(
+		cd sequencing_rebase_abort_and_untracked &&
+		git checkout fooey &&
+		test_must_fail git rebase simple &&
+
+		cat init.t &&
+		git rm init.t &&
+		echo precious >init.t &&
+		cp init.t expect &&
+		git status --porcelain &&
+		test_must_fail git rebase --abort &&
+		test_cmp expect init.t
+	)
+'
+
+test_expect_success 'git rebase fast forwarding and untracked files' '
+	test_setup_sequencing rebase_fast_forward_and_untracked &&
+	(
+		cd sequencing_rebase_fast_forward_and_untracked &&
+		git checkout init &&
+		echo precious >filler &&
+		cp filler expect &&
+		test_must_fail git rebase init simple &&
+		test_cmp expect filler
+	)
+'
+
+test_expect_failure 'git rebase --autostash and untracked files' '
+	test_setup_sequencing rebase_autostash_and_untracked &&
+	(
+		cd sequencing_rebase_autostash_and_untracked &&
+		git checkout simple &&
+		git rm filler &&
+		mkdir filler &&
+		echo precious >filler/file &&
+		cp filler/file expect &&
+		git rebase --autostash init &&
+		test_path_is_file filler/file
+	)
+'
+
+test_expect_failure 'git stash and untracked files' '
+	test_setup_sequencing stash_and_untracked_files &&
+	(
+		cd sequencing_stash_and_untracked_files &&
+		git checkout simple &&
+		git rm filler &&
+		mkdir filler &&
+		echo precious >filler/file &&
+		cp filler/file expect &&
+		git status --porcelain &&
+		git stash push &&
+		git status --porcelain &&
+		test_path_is_file filler/file
+	)
+'
+
+test_expect_success 'git am --abort and untracked dir vs. unmerged file' '
+	test_setup_sequencing am_abort_and_untracked &&
+	(
+		cd sequencing_am_abort_and_untracked &&
+		git format-patch -1 --stdout fooey >changes.mbox &&
+		test_must_fail git am --3way changes.mbox &&
+
+		# Delete the conflicted file; we will stage and commit it later
+		rm filler &&
+
+		# Put an unrelated untracked directory there
+		mkdir filler &&
+		echo foo >filler/file1 &&
+		echo bar >filler/file2 &&
+
+		test_must_fail git am --abort 2>errors &&
+		test_path_is_dir filler &&
+		grep "Updating .filler. would lose untracked files in it" errors
+	)
+'
+
+test_expect_success 'git am --skip and untracked dir vs deleted file' '
+	test_setup_sequencing am_skip_and_untracked &&
+	(
+		cd sequencing_am_skip_and_untracked &&
+		git checkout fooey &&
+		git format-patch -1 --stdout simple >changes.mbox &&
+		test_must_fail git am --3way changes.mbox &&
+
+		# Delete newfile
+		rm newfile &&
+
+		# Put an unrelated untracked directory there
+		mkdir newfile &&
+		echo foo >newfile/file1 &&
+		echo bar >newfile/file2 &&
+
+		# Change our mind about resolutions, just skip this patch
+		test_must_fail git am --skip 2>errors &&
+		test_path_is_dir newfile &&
+		grep "Updating .newfile. would lose untracked files in it" errors
+	)
+'
+
+test_done
diff --git a/t/t2501-cwd-empty.sh b/t/t2501-cwd-empty.sh
new file mode 100755
index 0000000..f6d8d7d
--- /dev/null
+++ b/t/t2501-cwd-empty.sh
@@ -0,0 +1,277 @@
+#!/bin/sh
+
+test_description='Test handling of the current working directory becoming empty'
+
+. ./test-lib.sh
+
+test_expect_success setup '
+	test_commit init &&
+
+	git branch fd_conflict &&
+
+	mkdir -p foo/bar &&
+	test_commit foo/bar/baz &&
+
+	git revert HEAD &&
+	git tag reverted &&
+
+	git checkout fd_conflict &&
+	mkdir dirORfile &&
+	test_commit dirORfile/foo &&
+
+	git rm -r dirORfile &&
+	echo not-a-directory >dirORfile &&
+	git add dirORfile &&
+	git commit -m dirORfile &&
+
+	git switch -c df_conflict HEAD~1 &&
+	test_commit random_file &&
+
+	git switch -c undo_fd_conflict fd_conflict &&
+	git revert HEAD
+'
+
+test_incidental_dir_removal () {
+	test_when_finished "git reset --hard" &&
+
+	git checkout foo/bar/baz^{commit} &&
+	test_path_is_dir foo/bar &&
+
+	(
+		cd foo &&
+		"$@" &&
+
+		# Make sure foo still exists, and commands needing it work
+		test-tool getcwd &&
+		git status --porcelain
+	) &&
+	test_path_is_missing foo/bar/baz &&
+	test_path_is_missing foo/bar &&
+
+	test_path_is_dir foo
+}
+
+test_required_dir_removal () {
+	git checkout df_conflict^{commit} &&
+	test_when_finished "git clean -fdx" &&
+
+	(
+		cd dirORfile &&
+
+		# Ensure command refuses to run
+		test_must_fail "$@" 2>../error &&
+		grep "Refusing to remove.*current working directory" ../error &&
+
+		# ...and that the index and working tree are left clean
+		git diff --exit-code HEAD &&
+
+		# Ensure that getcwd and git status do not error out (which
+		# they might if the current working directory had been removed)
+		test-tool getcwd &&
+		git status --porcelain
+	) &&
+
+	test_path_is_dir dirORfile
+}
+
+test_expect_success 'checkout does not clean cwd incidentally' '
+	test_incidental_dir_removal git checkout init
+'
+
+test_expect_success 'checkout fails if cwd needs to be removed' '
+	test_required_dir_removal git checkout fd_conflict
+'
+
+test_expect_success 'reset --hard does not clean cwd incidentally' '
+	test_incidental_dir_removal git reset --hard init
+'
+
+test_expect_success 'reset --hard fails if cwd needs to be removed' '
+	test_required_dir_removal git reset --hard fd_conflict
+'
+
+test_expect_success 'merge does not clean cwd incidentally' '
+	test_incidental_dir_removal git merge reverted
+'
+
+# This file uses some simple merges where
+#   Base: 'dirORfile/' exists
+#   Side1: random other file changed
+#   Side2: 'dirORfile/' removed, 'dirORfile' added
+# this should resolve cleanly, but merge-recursive throws merge conflicts
+# because it's dumb.  Add a special test for checking merge-recursive (and
+# merge-ort), then after this just hard require ort for all remaining tests.
+#
+test_expect_success 'merge fails if cwd needs to be removed; recursive friendly' '
+	git checkout foo/bar/baz &&
+	test_when_finished "git clean -fdx" &&
+
+	mkdir dirORfile &&
+	(
+		cd dirORfile &&
+
+		test_must_fail git merge fd_conflict 2>../error
+	) &&
+
+	test_path_is_dir dirORfile &&
+	grep "Refusing to remove the current working directory" error
+'
+
+GIT_TEST_MERGE_ALGORITHM=ort
+
+test_expect_success 'merge fails if cwd needs to be removed' '
+	test_required_dir_removal git merge fd_conflict
+'
+
+test_expect_success 'cherry-pick does not clean cwd incidentally' '
+	test_incidental_dir_removal git cherry-pick reverted
+'
+
+test_expect_success 'cherry-pick fails if cwd needs to be removed' '
+	test_required_dir_removal git cherry-pick fd_conflict
+'
+
+test_expect_success 'rebase does not clean cwd incidentally' '
+	test_incidental_dir_removal git rebase reverted
+'
+
+test_expect_success 'rebase fails if cwd needs to be removed' '
+	test_required_dir_removal git rebase fd_conflict
+'
+
+test_expect_success 'revert does not clean cwd incidentally' '
+	test_incidental_dir_removal git revert HEAD
+'
+
+test_expect_success 'revert fails if cwd needs to be removed' '
+	test_required_dir_removal git revert undo_fd_conflict
+'
+
+test_expect_success 'rm does not clean cwd incidentally' '
+	test_incidental_dir_removal git rm bar/baz.t
+'
+
+test_expect_success 'apply does not remove cwd incidentally' '
+	git diff HEAD HEAD~1 >patch &&
+	test_incidental_dir_removal git apply ../patch
+'
+
+test_incidental_untracked_dir_removal () {
+	test_when_finished "git reset --hard" &&
+
+	git checkout foo/bar/baz^{commit} &&
+	mkdir -p untracked &&
+	mkdir empty
+	>untracked/random &&
+
+	(
+		cd untracked &&
+		"$@" &&
+
+		# Make sure untracked still exists, and commands needing it work
+		test-tool getcwd &&
+		git status --porcelain
+	) &&
+	test_path_is_missing empty &&
+	test_path_is_missing untracked/random &&
+
+	test_path_is_dir untracked
+}
+
+test_expect_success 'clean does not remove cwd incidentally' '
+	test_incidental_untracked_dir_removal \
+		git -C .. clean -fd -e warnings . >warnings &&
+	grep "Refusing to remove current working directory" warnings
+'
+
+test_expect_success 'stash does not remove cwd incidentally' '
+	test_incidental_untracked_dir_removal \
+		git stash --include-untracked
+'
+
+test_expect_success '`rm -rf dir` only removes a subset of dir' '
+	test_when_finished "rm -rf a/" &&
+
+	mkdir -p a/b/c &&
+	>a/b/c/untracked &&
+	>a/b/c/tracked &&
+	git add a/b/c/tracked &&
+
+	(
+		cd a/b &&
+		git rm -rf ../b
+	) &&
+
+	test_path_is_dir a/b &&
+	test_path_is_missing a/b/c/tracked &&
+	test_path_is_file a/b/c/untracked
+'
+
+test_expect_success '`rm -rf dir` even with only tracked files will remove something else' '
+	test_when_finished "rm -rf a/" &&
+
+	mkdir -p a/b/c &&
+	>a/b/c/tracked &&
+	git add a/b/c/tracked &&
+
+	(
+		cd a/b &&
+		git rm -rf ../b
+	) &&
+
+	test_path_is_missing a/b/c/tracked &&
+	test_path_is_missing a/b/c &&
+	test_path_is_dir a/b
+'
+
+test_expect_success 'git version continues working from a deleted dir' '
+	mkdir tmp &&
+	(
+		cd tmp &&
+		rm -rf ../tmp &&
+		git version
+	)
+'
+
+test_submodule_removal () {
+	path_status=$1 &&
+	shift &&
+
+	test_status=
+	test "$path_status" = dir && test_status=test_must_fail
+
+	test_when_finished "git reset --hard HEAD~1" &&
+	test_when_finished "rm -rf .git/modules/my_submodule" &&
+
+	git checkout foo/bar/baz &&
+
+	git init my_submodule &&
+	touch my_submodule/file &&
+	git -C my_submodule add file &&
+	git -C my_submodule commit -m "initial commit" &&
+	git submodule add ./my_submodule &&
+	git commit -m "Add the submodule" &&
+
+	(
+		cd my_submodule &&
+		$test_status "$@"
+	) &&
+
+	test_path_is_${path_status} my_submodule
+}
+
+test_expect_success 'rm -r with -C leaves submodule if cwd inside' '
+	test_submodule_removal dir git -C .. rm -r my_submodule/
+'
+
+test_expect_success 'rm -r leaves submodule if cwd inside' '
+	test_submodule_removal dir \
+		git --git-dir=../.git --work-tree=.. rm -r ../my_submodule/
+'
+
+test_expect_success 'rm -rf removes submodule even if cwd inside' '
+	test_submodule_removal missing \
+		git --git-dir=../.git --work-tree=.. rm -rf ../my_submodule/
+'
+
+test_done
diff --git a/t/t3000-ls-files-others.sh b/t/t3000-ls-files-others.sh
index ffdfb16..11af455 100755
--- a/t/t3000-ls-files-others.sh
+++ b/t/t3000-ls-files-others.sh
@@ -15,6 +15,8 @@ filesystem.
     path3/file3 - a file in a directory
     path4       - an empty directory
 '
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup ' '
@@ -152,7 +154,7 @@ test_expect_success 'ls-files -o --directory with mix dir/file pathspecs' '
 	)
 '
 
-test_expect_success 'ls-files --o --directory with glob filetype match' '
+test_expect_success 'ls-files -o --directory with glob filetype match' '
 	(
 		cd nested &&
 
@@ -168,7 +170,7 @@ test_expect_success 'ls-files --o --directory with glob filetype match' '
 	)
 '
 
-test_expect_success 'ls-files --o --directory with mix of tracked states' '
+test_expect_success 'ls-files -o --directory with mix of tracked states' '
 	(
 		cd nested &&
 
@@ -184,7 +186,7 @@ test_expect_success 'ls-files --o --directory with mix of tracked states' '
 	)
 '
 
-test_expect_success 'ls-files --o --directory with glob filetype match only' '
+test_expect_success 'ls-files -o --directory with glob filetype match only' '
 	(
 		cd nested &&
 
@@ -198,7 +200,7 @@ test_expect_success 'ls-files --o --directory with glob filetype match only' '
 	)
 '
 
-test_expect_success 'ls-files --o --directory to get immediate paths under one dir only' '
+test_expect_success 'ls-files -o --directory to get immediate paths under one dir only' '
 	(
 		cd nested &&
 
@@ -212,4 +214,20 @@ test_expect_success 'ls-files --o --directory to get immediate paths under one d
 	)
 '
 
+test_expect_success 'ls-files -o avoids listing untracked non-matching gitdir' '
+	test_when_finished "rm -rf nested/untracked/deep/empty" &&
+	(
+		cd nested &&
+
+		git init untracked/deep/empty &&
+		git ls-files --others "untracked/*.c" >actual &&
+
+		cat <<-EOF >expect &&
+		untracked/deep/foo.c
+		EOF
+
+		test_cmp expect actual
+	)
+'
+
 test_done
diff --git a/t/t3001-ls-files-others-exclude.sh b/t/t3001-ls-files-others-exclude.sh
index 1ec7cb5..1ed0aa9 100755
--- a/t/t3001-ls-files-others-exclude.sh
+++ b/t/t3001-ls-files-others-exclude.sh
@@ -8,6 +8,7 @@ test_description='git ls-files --others --exclude
 This test runs git ls-files --others and tests --exclude patterns.
 '
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 rm -fr one three
@@ -66,26 +67,26 @@ echo '!*.2
 
 allignores='.gitignore one/.gitignore one/two/.gitignore'
 
-test_expect_success \
-    'git ls-files --others with various exclude options.' \
-    'git ls-files --others \
+test_expect_success 'git ls-files --others with various exclude options.' '
+	git ls-files --others \
        --exclude=\*.6 \
        --exclude-per-directory=.gitignore \
        --exclude-from=.git/ignore \
-       >output &&
-     test_cmp expect output'
+	>output &&
+	test_cmp expect output
+'
 
 # Test \r\n (MSDOS-like systems)
 printf '*.1\r\n/*.3\r\n!*.6\r\n' >.gitignore
 
-test_expect_success \
-    'git ls-files --others with \r\n line endings.' \
-    'git ls-files --others \
+test_expect_success 'git ls-files --others with \r\n line endings.' '
+	git ls-files --others \
        --exclude=\*.6 \
        --exclude-per-directory=.gitignore \
        --exclude-from=.git/ignore \
-       >output &&
-     test_cmp expect output'
+	>output &&
+	test_cmp expect output
+'
 
 test_expect_success 'setup skip-worktree gitignore' '
 	git add $allignores &&
@@ -93,14 +94,14 @@ test_expect_success 'setup skip-worktree gitignore' '
 	rm $allignores
 '
 
-test_expect_success \
-    'git ls-files --others with various exclude options.' \
-    'git ls-files --others \
+test_expect_success 'git ls-files --others with various exclude options.' '
+	git ls-files --others \
        --exclude=\*.6 \
        --exclude-per-directory=.gitignore \
        --exclude-from=.git/ignore \
-       >output &&
-     test_cmp expect output'
+	>output &&
+	test_cmp expect output
+'
 
 test_expect_success 'restore gitignore' '
 	git checkout --ignore-skip-worktree-bits $allignores &&
@@ -282,16 +283,21 @@ test_expect_success 'pattern matches prefix completely' '
 '
 
 test_expect_success 'ls-files with "**" patterns' '
-	cat <<\EOF >expect &&
-a.1
-one/a.1
-one/two/a.1
-three/a.1
-EOF
+	cat <<-\EOF >expect &&
+	a.1
+	one/a.1
+	one/two/a.1
+	three/a.1
+	EOF
 	git ls-files -o -i --exclude "**/a.1" >actual &&
 	test_cmp expect actual
 '
 
+test_expect_success 'ls-files with "**" patterns and --directory' '
+	# Expectation same as previous test
+	git ls-files --directory -o -i --exclude "**/a.1" >actual &&
+	test_cmp expect actual
+'
 
 test_expect_success 'ls-files with "**" patterns and no slashes' '
 	git ls-files -o -i --exclude "one**a.1" >actual &&
diff --git a/t/t3002-ls-files-dashpath.sh b/t/t3002-ls-files-dashpath.sh
index 8704b04..4dd2455 100755
--- a/t/t3002-ls-files-dashpath.sh
+++ b/t/t3002-ls-files-dashpath.sh
@@ -12,58 +12,66 @@ filesystem.
     -foo	- a file with a funny name.
     --		- another file with a funny name.
 '
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
-test_expect_success \
-	setup \
-	'echo frotz >path0 &&
+test_expect_success 'setup' '
+	echo frotz >path0 &&
 	echo frotz >./-foo &&
-	echo frotz >./--'
+	echo frotz >./--
+'
 
-test_expect_success \
-    'git ls-files without path restriction.' \
-    'git ls-files --others >output &&
-     test_cmp output - <<EOF
---
--foo
-output
-path0
-EOF
+test_expect_success 'git ls-files without path restriction.' '
+	test_when_finished "rm -f expect" &&
+	git ls-files --others >output &&
+	cat >expect <<-\EOF &&
+	--
+	-foo
+	output
+	path0
+	EOF
+	test_cmp output expect
 '
 
-test_expect_success \
-    'git ls-files with path restriction.' \
-    'git ls-files --others path0 >output &&
-	test_cmp output - <<EOF
-path0
-EOF
+test_expect_success 'git ls-files with path restriction.' '
+	test_when_finished "rm -f expect" &&
+	git ls-files --others path0 >output &&
+	cat >expect <<-\EOF &&
+	path0
+	EOF
+	test_cmp output expect
 '
 
-test_expect_success \
-    'git ls-files with path restriction with --.' \
-    'git ls-files --others -- path0 >output &&
-	test_cmp output - <<EOF
-path0
-EOF
+test_expect_success 'git ls-files with path restriction with --.' '
+	test_when_finished "rm -f expect" &&
+	git ls-files --others -- path0 >output &&
+	cat >expect <<-\EOF &&
+	path0
+	EOF
+	test_cmp output expect
 '
 
-test_expect_success \
-    'git ls-files with path restriction with -- --.' \
-    'git ls-files --others -- -- >output &&
-	test_cmp output - <<EOF
---
-EOF
+test_expect_success 'git ls-files with path restriction with -- --.' '
+	test_when_finished "rm -f expect" &&
+	git ls-files --others -- -- >output &&
+	cat >expect <<-\EOF &&
+	--
+	EOF
+	test_cmp output expect
 '
 
-test_expect_success \
-    'git ls-files with no path restriction.' \
-    'git ls-files --others -- >output &&
-	test_cmp output - <<EOF
---
--foo
-output
-path0
-EOF
+test_expect_success 'git ls-files with no path restriction.' '
+	test_when_finished "rm -f expect" &&
+	git ls-files --others -- >output &&
+	cat >expect <<-\EOF &&
+	--
+	-foo
+	output
+	path0
+	EOF
+	test_cmp output expect
+
 '
 
 test_done
diff --git a/t/t3003-ls-files-exclude.sh b/t/t3003-ls-files-exclude.sh
index d5ec333..7933dff 100755
--- a/t/t3003-ls-files-exclude.sh
+++ b/t/t3003-ls-files-exclude.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='ls-files --exclude does not affect index files'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'create repo with file' '
@@ -29,11 +31,11 @@ test_expect_success 'add file to gitignore' '
 '
 check_all_output
 
-test_expect_success 'ls-files -i lists only tracked-but-ignored files' '
+test_expect_success 'ls-files -i -c lists only tracked-but-ignored files' '
 	echo content >other-file &&
 	git add other-file &&
 	echo file >expect &&
-	git ls-files -i --exclude-standard >output &&
+	git ls-files -i -c --exclude-standard >output &&
 	test_cmp expect output
 '
 
diff --git a/t/t3004-ls-files-basic.sh b/t/t3004-ls-files-basic.sh
index 9fd5a1f..12e41a7 100755
--- a/t/t3004-ls-files-basic.sh
+++ b/t/t3004-ls-files-basic.sh
@@ -6,6 +6,7 @@ This test runs git ls-files with various unusual or malformed
 command-line arguments.
 '
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'ls-files in empty repository' '
@@ -20,7 +21,7 @@ test_expect_success 'ls-files with nonexistent path' '
 
 test_expect_success 'ls-files with nonsense option' '
 	test_expect_code 129 git ls-files --nonsense 2>actual &&
-	test_i18ngrep "[Uu]sage: git ls-files" actual
+	test_grep "[Uu]sage: git ls-files" actual
 '
 
 test_expect_success 'ls-files -h in corrupt repository' '
@@ -31,7 +32,7 @@ test_expect_success 'ls-files -h in corrupt repository' '
 		>.git/index &&
 		test_expect_code 129 git ls-files -h >usage 2>&1
 	) &&
-	test_i18ngrep "[Uu]sage: git ls-files " broken/usage
+	test_grep "[Uu]sage: git ls-files " broken/usage
 '
 
 test_expect_success SYMLINKS 'ls-files with absolute paths to symlinks' '
diff --git a/t/t3005-ls-files-relative.sh b/t/t3005-ls-files-relative.sh
index 2ec69a8..fbfa210 100755
--- a/t/t3005-ls-files-relative.sh
+++ b/t/t3005-ls-files-relative.sh
@@ -5,6 +5,7 @@ test_description='ls-files tests with relative paths
 This test runs git ls-files with various relative path arguments.
 '
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'prepare' '
@@ -38,30 +39,24 @@ test_expect_success 'ls-files with mixed levels' '
 test_expect_success 'ls-files -c' '
 	(
 		cd top/sub &&
-		for f in ../y*
-		do
-			echo "error: pathspec $SQ$f$SQ did not match any file(s) known to git"
-		done >expect.err &&
+		printf "error: pathspec $SQ%s$SQ did not match any file(s) known to git\n" ../y* >expect.err &&
 		echo "Did you forget to ${SQ}git add${SQ}?" >>expect.err &&
 		ls ../x* >expect.out &&
 		test_must_fail git ls-files -c --error-unmatch ../[xy]* >actual.out 2>actual.err &&
 		test_cmp expect.out actual.out &&
-		test_i18ncmp expect.err actual.err
+		test_cmp expect.err actual.err
 	)
 '
 
 test_expect_success 'ls-files -o' '
 	(
 		cd top/sub &&
-		for f in ../x*
-		do
-			echo "error: pathspec $SQ$f$SQ did not match any file(s) known to git"
-		done >expect.err &&
+		printf "error: pathspec $SQ%s$SQ did not match any file(s) known to git\n" ../x* >expect.err &&
 		echo "Did you forget to ${SQ}git add${SQ}?" >>expect.err &&
 		ls ../y* >expect.out &&
 		test_must_fail git ls-files -o --error-unmatch ../[xy]* >actual.out 2>actual.err &&
 		test_cmp expect.out actual.out &&
-		test_i18ncmp expect.err actual.err
+		test_cmp expect.err actual.err
 	)
 '
 
diff --git a/t/t3006-ls-files-long.sh b/t/t3006-ls-files-long.sh
index e109c3f..2aaf91e 100755
--- a/t/t3006-ls-files-long.sh
+++ b/t/t3006-ls-files-long.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='overly long paths'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
diff --git a/t/t3007-ls-files-recurse-submodules.sh b/t/t3007-ls-files-recurse-submodules.sh
index 4a08000..61771ee 100755
--- a/t/t3007-ls-files-recurse-submodules.sh
+++ b/t/t3007-ls-files-recurse-submodules.sh
@@ -34,6 +34,23 @@ test_expect_success 'ls-files correctly outputs files in submodule' '
 	test_cmp expect actual
 '
 
+test_expect_success '--stage' '
+	GITMODULES_HASH=$(git rev-parse HEAD:.gitmodules) &&
+	A_HASH=$(git rev-parse HEAD:a) &&
+	B_HASH=$(git rev-parse HEAD:b/b) &&
+	C_HASH=$(git -C submodule rev-parse HEAD:c) &&
+
+	cat >expect <<-EOF &&
+	100644 $GITMODULES_HASH 0	.gitmodules
+	100644 $A_HASH 0	a
+	100644 $B_HASH 0	b/b
+	100644 $C_HASH 0	submodule/c
+	EOF
+
+	git ls-files --stage --recurse-submodules >actual &&
+	test_cmp expect actual
+'
+
 test_expect_success 'ls-files correctly outputs files in submodule with -z' '
 	lf_to_nul >expect <<-\EOF &&
 	.gitmodules
@@ -279,20 +296,52 @@ test_expect_success '--recurse-submodules and relative paths' '
 
 test_expect_success '--recurse-submodules does not support --error-unmatch' '
 	test_must_fail git ls-files --recurse-submodules --error-unmatch 2>actual &&
-	test_i18ngrep "does not support --error-unmatch" actual
+	test_grep "does not support --error-unmatch" actual
+'
+
+test_expect_success '--recurse-submodules parses submodule repo config' '
+	test_config -C submodule index.sparse "invalid non-boolean value" &&
+	test_must_fail git ls-files --recurse-submodules 2>err &&
+	grep "bad boolean config value" err
+'
+
+test_expect_success '--recurse-submodules parses submodule worktree config' '
+	test_config -C submodule extensions.worktreeConfig true &&
+	test_config -C submodule --worktree index.sparse "invalid non-boolean value" &&
+
+	test_must_fail git ls-files --recurse-submodules 2>err &&
+	grep "bad boolean config value" err
+'
+
+test_expect_success '--recurse-submodules submodules ignore super project worktreeConfig extension' '
+	# Enable worktree config in both super project & submodule, set an
+	# invalid config in the submodule worktree config
+	test_config extensions.worktreeConfig true &&
+	test_config -C submodule extensions.worktreeConfig true &&
+	test_config -C submodule --worktree index.sparse "invalid non-boolean value" &&
+
+	# Now, disable the worktree config in the submodule. Note that we need
+	# to manually re-enable extensions.worktreeConfig when the test is
+	# finished, otherwise the test_unconfig of index.sparse will not work.
+	test_unconfig -C submodule extensions.worktreeConfig &&
+	test_when_finished "git -C submodule config extensions.worktreeConfig true" &&
+
+	# With extensions.worktreeConfig disabled in the submodule, the invalid
+	# worktree config is not picked up.
+	git ls-files --recurse-submodules 2>err &&
+	! grep "bad boolean config value" err
 '
 
 test_incompatible_with_recurse_submodules () {
 	test_expect_success "--recurse-submodules and $1 are incompatible" "
 		test_must_fail git ls-files --recurse-submodules $1 2>actual &&
-		test_i18ngrep 'unsupported mode' actual
+		test_grep 'unsupported mode' actual
 	"
 }
 
 test_incompatible_with_recurse_submodules --deleted
 test_incompatible_with_recurse_submodules --modified
 test_incompatible_with_recurse_submodules --others
-test_incompatible_with_recurse_submodules --stage
 test_incompatible_with_recurse_submodules --killed
 test_incompatible_with_recurse_submodules --unmerged
 
diff --git a/t/t3008-ls-files-lazy-init-name-hash.sh b/t/t3008-ls-files-lazy-init-name-hash.sh
index 85f3704..51d3dff 100755
--- a/t/t3008-ls-files-lazy-init-name-hash.sh
+++ b/t/t3008-ls-files-lazy-init-name-hash.sh
@@ -2,6 +2,7 @@
 
 test_description='Test the lazy init name hash with various folder structures'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 if test 1 -eq $(test-tool online-cpus)
diff --git a/t/t3009-ls-files-others-nonsubmodule.sh b/t/t3009-ls-files-others-nonsubmodule.sh
index 963f346..14218b3 100755
--- a/t/t3009-ls-files-others-nonsubmodule.sh
+++ b/t/t3009-ls-files-others-nonsubmodule.sh
@@ -18,6 +18,7 @@ This test runs git ls-files --others with the following working tree:
       git repository with a commit and an untracked file
 '
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup: directories' '
diff --git a/t/t3010-ls-files-killed-modified.sh b/t/t3010-ls-files-killed-modified.sh
index 580e158..0541787 100755
--- a/t/t3010-ls-files-killed-modified.sh
+++ b/t/t3010-ls-files-killed-modified.sh
@@ -41,6 +41,8 @@ Also for modification test, the cache and working tree have:
 We should report path0, path1, path2/file2, path3/file3, path7 and path8
 modified without reporting path9 and path10.  submod1 is also modified.
 '
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'git update-index --add to add various paths.' '
diff --git a/t/t3012-ls-files-dedup.sh b/t/t3012-ls-files-dedup.sh
new file mode 100755
index 0000000..190e2f6
--- /dev/null
+++ b/t/t3012-ls-files-dedup.sh
@@ -0,0 +1,67 @@
+#!/bin/sh
+
+test_description='git ls-files --deduplicate test'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+test_expect_success 'setup' '
+	>a.txt &&
+	>b.txt &&
+	>delete.txt &&
+	git add a.txt b.txt delete.txt &&
+	git commit -m base &&
+	echo a >a.txt &&
+	echo b >b.txt &&
+	echo delete >delete.txt &&
+	git add a.txt b.txt delete.txt &&
+	git commit -m tip &&
+	git tag tip &&
+	git reset --hard HEAD^ &&
+	echo change >a.txt &&
+	git commit -a -m side &&
+	git tag side
+'
+
+test_expect_success 'git ls-files --deduplicate to show unique unmerged path' '
+	test_must_fail git merge tip &&
+	git ls-files --deduplicate >actual &&
+	cat >expect <<-\EOF &&
+	a.txt
+	b.txt
+	delete.txt
+	EOF
+	test_cmp expect actual &&
+	git merge --abort
+'
+
+test_expect_success 'git ls-files -d -m --deduplicate with different display options' '
+	git reset --hard side &&
+	test_must_fail git merge tip &&
+	rm delete.txt &&
+	git ls-files -d -m --deduplicate >actual &&
+	cat >expect <<-\EOF &&
+	a.txt
+	delete.txt
+	EOF
+	test_cmp expect actual &&
+	git ls-files -d -m -t --deduplicate >actual &&
+	cat >expect <<-\EOF &&
+	C a.txt
+	C a.txt
+	C a.txt
+	R delete.txt
+	C delete.txt
+	EOF
+	test_cmp expect actual &&
+	git ls-files -d -m -c --deduplicate >actual &&
+	cat >expect <<-\EOF &&
+	a.txt
+	b.txt
+	delete.txt
+	EOF
+	test_cmp expect actual &&
+	git merge --abort
+'
+
+test_done
diff --git a/t/t3013-ls-files-format.sh b/t/t3013-ls-files-format.sh
new file mode 100755
index 0000000..6e6ea0b
--- /dev/null
+++ b/t/t3013-ls-files-format.sh
@@ -0,0 +1,146 @@
+#!/bin/sh
+
+test_description='git ls-files --format test'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+for flag in -s -o -k -t --resolve-undo --deduplicate --eol
+do
+	test_expect_success "usage: --format is incompatible with $flag" '
+		test_expect_code 129 git ls-files --format="%(objectname)" $flag
+	'
+done
+
+test_expect_success 'setup' '
+	printf "LINEONE\nLINETWO\nLINETHREE\n" >o1.txt &&
+	printf "LINEONE\r\nLINETWO\r\nLINETHREE\r\n" >o2.txt &&
+	printf "LINEONE\r\nLINETWO\nLINETHREE\n" >o3.txt &&
+	git add o?.txt &&
+	oid=$(git hash-object o1.txt) &&
+	git update-index --add --cacheinfo 120000 $oid o4.txt &&
+	git update-index --add --cacheinfo 160000 $oid o5.txt &&
+	git update-index --add --cacheinfo 100755 $oid o6.txt &&
+	git commit -m base
+'
+
+test_expect_success 'git ls-files --format objectmode v.s. -s' '
+	git ls-files -s >files &&
+	cut -d" " -f1 files >expect &&
+	git ls-files --format="%(objectmode)" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'git ls-files --format objectname v.s. -s' '
+	git ls-files -s >files &&
+	cut -d" " -f2 files >expect &&
+	git ls-files --format="%(objectname)" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'git ls-files --format objecttype' '
+	git ls-files --format="%(objectname)" o1.txt o4.txt o6.txt >objectname &&
+	git cat-file --batch-check="%(objecttype)" >expect <objectname &&
+	git ls-files --format="%(objecttype)" o1.txt o4.txt o6.txt >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'git ls-files --format objectsize' '
+	cat>expect <<-\EOF &&
+26
+29
+27
+26
+-
+26
+	EOF
+	git ls-files --format="%(objectsize)" >actual &&
+
+	test_cmp expect actual
+'
+
+test_expect_success 'git ls-files --format objectsize:padded' '
+	cat>expect <<-\EOF &&
+     26
+     29
+     27
+     26
+      -
+     26
+	EOF
+	git ls-files --format="%(objectsize:padded)" >actual &&
+
+	test_cmp expect actual
+'
+
+test_expect_success 'git ls-files --format v.s. --eol' '
+	git ls-files --eol >tmp &&
+	sed -e "s/	/ /g" -e "s/  */ /g" tmp >expect 2>err &&
+	test_must_be_empty err &&
+	git ls-files --format="i/%(eolinfo:index) w/%(eolinfo:worktree) attr/%(eolattr) %(path)" >actual 2>err &&
+	test_must_be_empty err &&
+	test_cmp expect actual
+'
+
+test_expect_success 'git ls-files --format path v.s. -s' '
+	git ls-files -s >files &&
+	cut -f2 files >expect &&
+	git ls-files --format="%(path)" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'git ls-files --format with relative path' '
+	cat >expect <<-\EOF &&
+	../o1.txt
+	../o2.txt
+	../o3.txt
+	../o4.txt
+	../o5.txt
+	../o6.txt
+	EOF
+	mkdir sub &&
+	cd sub &&
+	git ls-files --format="%(path)" ":/" >../actual &&
+	cd .. &&
+	test_cmp expect actual
+'
+
+test_expect_success 'git ls-files --format with -m' '
+	echo change >o1.txt &&
+	cat >expect <<-\EOF &&
+	o1.txt
+	o4.txt
+	o5.txt
+	o6.txt
+	EOF
+	git ls-files --format="%(path)" -m >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'git ls-files --format with -d' '
+	echo o7 >o7.txt &&
+	git add o7.txt &&
+	rm o7.txt &&
+	cat >expect <<-\EOF &&
+	o4.txt
+	o5.txt
+	o6.txt
+	o7.txt
+	EOF
+	git ls-files --format="%(path)" -d >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'git ls-files --format v.s -s' '
+	git ls-files --stage >expect &&
+	git ls-files --format="%(objectmode) %(objectname) %(stage)%x09%(path)" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'git ls-files --format with --debug' '
+	git ls-files --debug >expect &&
+	git ls-files --format="%(path)" --debug >actual &&
+	test_cmp expect actual
+'
+
+test_done
diff --git a/t/t3020-ls-files-error-unmatch.sh b/t/t3020-ls-files-error-unmatch.sh
index 124e73b..133593d 100755
--- a/t/t3020-ls-files-error-unmatch.sh
+++ b/t/t3020-ls-files-error-unmatch.sh
@@ -9,6 +9,8 @@ This test runs git ls-files --error-unmatch to ensure it correctly
 returns an error when a non-existent path is provided on the command
 line.
 '
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -17,12 +19,12 @@ test_expect_success 'setup' '
 	git commit -m "add foo bar"
 '
 
-test_expect_success \
-    'git ls-files --error-unmatch should fail with unmatched path.' \
-    'test_must_fail git ls-files --error-unmatch foo bar-does-not-match'
+test_expect_success 'git ls-files --error-unmatch should fail with unmatched path.' '
+	test_must_fail git ls-files --error-unmatch foo bar-does-not-match
+'
 
-test_expect_success \
-    'git ls-files --error-unmatch should succeed with matched paths.' \
-    'git ls-files --error-unmatch foo bar'
+test_expect_success 'git ls-files --error-unmatch should succeed with matched paths.' '
+	git ls-files --error-unmatch foo bar
+'
 
 test_done
diff --git a/t/t3040-subprojects-basic.sh b/t/t3040-subprojects-basic.sh
index b81eb5f..bd65dfc 100755
--- a/t/t3040-subprojects-basic.sh
+++ b/t/t3040-subprojects-basic.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='Basic subproject functionality'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup: create superproject' '
@@ -79,7 +81,4 @@ test_expect_success 'checkout in superproject' '
 	git diff-index --exit-code --raw --cached save -- sub1
 '
 
-# just interesting what happened...
-# git diff --name-status -M save master
-
 test_done
diff --git a/t/t3050-subprojects-fetch.sh b/t/t3050-subprojects-fetch.sh
index f1f09ab..3884694 100755
--- a/t/t3050-subprojects-fetch.sh
+++ b/t/t3050-subprojects-fetch.sh
@@ -2,6 +2,7 @@
 
 test_description='fetching and pushing project with subproject'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
diff --git a/t/t3060-ls-files-with-tree.sh b/t/t3060-ls-files-with-tree.sh
index 52ed665..5a06732 100755
--- a/t/t3060-ls-files-with-tree.sh
+++ b/t/t3060-ls-files-with-tree.sh
@@ -8,9 +8,11 @@ test_description='git ls-files test (--with-tree).
 This test runs git ls-files --with-tree and in particular in
 a scenario known to trigger a crash with some versions of git.
 '
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
-test_expect_success setup '
+test_expect_success 'setup' '
 
 	# The bug we are exercising requires a fair number of entries
 	# in a sub-directory so that add_index_entry will trigger a
@@ -38,7 +40,7 @@ test_expect_success setup '
 	git commit -a -m "remove them all" &&
 
 	# The bug also requires some entry before our directory so that
-	# prune_path will modify the_index.cache
+	# prune_index will modify the_repository->index.cache
 
 	mkdir a_directory_that_sorts_before_sub &&
 	>a_directory_that_sorts_before_sub/file &&
@@ -47,8 +49,14 @@ test_expect_success setup '
 	git add .
 '
 
+test_expect_success 'usage' '
+	test_expect_code 128 git ls-files --with-tree=HEAD -u &&
+	test_expect_code 128 git ls-files --with-tree=HEAD -s &&
+	test_expect_code 128 git ls-files --recurse-submodules --with-tree=HEAD
+'
+
 test_expect_success 'git ls-files --with-tree should succeed from subdir' '
-	# We have to run from a sub-directory to trigger prune_path
+	# We have to run from a sub-directory to trigger prune_index
 	# Then we finally get to run our --with-tree test
 	(
 		cd sub &&
@@ -56,8 +64,43 @@ test_expect_success 'git ls-files --with-tree should succeed from subdir' '
 	)
 '
 
-test_expect_success \
-    'git ls-files --with-tree should add entries from named tree.' \
-    'test_cmp expected output'
+test_expect_success 'git ls-files --with-tree should add entries from named tree.' '
+	test_cmp expected output
+'
+
+test_expect_success 'no duplicates in --with-tree output' '
+	git ls-files --with-tree=HEAD >actual &&
+	sort -u actual >expected &&
+	test_cmp expected actual
+'
+
+test_expect_success 'setup: output in a conflict' '
+	test_create_repo conflict &&
+	test_commit -C conflict BASE file &&
+	test_commit -C conflict A file foo &&
+	git -C conflict reset --hard BASE &&
+	test_commit -C conflict B file bar
+'
+
+test_expect_success 'output in a conflict' '
+	test_must_fail git -C conflict merge A B &&
+	cat >expected <<-\EOF &&
+	file
+	file
+	file
+	file
+	EOF
+	git -C conflict ls-files --with-tree=HEAD >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'output with removed .git/index' '
+	cat >expected <<-\EOF &&
+	file
+	EOF
+	rm conflict/.git/index &&
+	git -C conflict ls-files --with-tree=HEAD >actual &&
+	test_cmp expected actual
+'
 
 test_done
diff --git a/t/t3070-wildmatch.sh b/t/t3070-wildmatch.sh
index 891d4d7..4dd42df 100755
--- a/t/t3070-wildmatch.sh
+++ b/t/t3070-wildmatch.sh
@@ -2,6 +2,7 @@
 
 test_description='wildmatch tests'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 should_create_test_file() {
@@ -187,7 +188,7 @@ match() {
 		file=$(cat .git/expected_test_file) &&
 		if should_create_test_file "$file"
 		then
-			dirs=${file%/*}
+			dirs=${file%/*} &&
 			if test "$file" != "$dirs"
 			then
 				mkdir -p -- "$dirs" &&
@@ -430,4 +431,15 @@ match 1 1 1 1 'a' '[B-a]'
 match 0 1 0 1 'z' '[Z-y]'
 match 1 1 1 1 'Z' '[Z-y]'
 
+test_expect_success 'matching does not exhibit exponential behavior' '
+	{
+		test-tool wildmatch wildmatch \
+			aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaab \
+			"*a*a*a*a*a*a*a*a*a*a*a*a*a*a*a*a" &
+		pid=$!
+	} &&
+	sleep 2 &&
+	! kill $!
+'
+
 test_done
diff --git a/t/t3100-ls-tree-restrict.sh b/t/t3100-ls-tree-restrict.sh
index 18baf49..436de44 100755
--- a/t/t3100-ls-tree-restrict.sh
+++ b/t/t3100-ls-tree-restrict.sh
@@ -16,6 +16,8 @@ This test runs git ls-tree with the following in a tree.
 The new path restriction code should do the right thing for path2 and
 path2/baz.  Also path0/ should snow nothing.
 '
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success \
diff --git a/t/t3101-ls-tree-dirname.sh b/t/t3101-ls-tree-dirname.sh
index 12bf310..5af2dac 100755
--- a/t/t3101-ls-tree-dirname.sh
+++ b/t/t3101-ls-tree-dirname.sh
@@ -19,6 +19,8 @@ This test runs git ls-tree with the following in a tree.
 Test the handling of multiple directories which have matching file
 entries.  Also test odd filename and missing entries handling.
 '
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -152,6 +154,14 @@ EOF
 	test_output
 '
 
+test_expect_success 'ls-tree --no-full-name' '
+	git -C path0 ls-tree --no-full-name $tree a >current &&
+	cat >expected <<-EOF &&
+	040000 tree X	a
+	EOF
+	test_output
+'
+
 test_expect_success 'ls-tree --full-tree' '
 	(
 		cd path1/b/c &&
@@ -199,31 +209,34 @@ EOF
 	test_cmp expected check
 '
 
-test_expect_success 'ls-tree --name-only' '
-	git ls-tree --name-only $tree >current &&
-	cat >expected <<\EOF &&
-1.txt
-2.txt
-path0
-path1
-path2
-path3
-EOF
-	test_output
-'
-
-test_expect_success 'ls-tree --name-only -r' '
-	git ls-tree --name-only -r $tree >current &&
-	cat >expected <<\EOF &&
-1.txt
-2.txt
-path0/a/b/c/1.txt
-path1/b/c/1.txt
-path2/1.txt
-path3/1.txt
-path3/2.txt
-EOF
-	test_output
-'
+for opt in --name-only --name-status
+do
+	test_expect_success "ls-tree $opt" '
+		git ls-tree $opt $tree >current &&
+		cat >expected <<-\EOF &&
+		1.txt
+		2.txt
+		path0
+		path1
+		path2
+		path3
+		EOF
+		test_output
+	'
+
+	test_expect_success "ls-tree $opt -r" '
+		git ls-tree $opt -r $tree >current &&
+		cat >expected <<-\EOF &&
+		1.txt
+		2.txt
+		path0/a/b/c/1.txt
+		path1/b/c/1.txt
+		path2/1.txt
+		path3/1.txt
+		path3/2.txt
+		EOF
+		test_output
+	'
+done
 
 test_done
diff --git a/t/t3102-ls-tree-wildcards.sh b/t/t3102-ls-tree-wildcards.sh
index 1e16c6b..3942db2 100755
--- a/t/t3102-ls-tree-wildcards.sh
+++ b/t/t3102-ls-tree-wildcards.sh
@@ -2,6 +2,7 @@
 
 test_description='ls-tree with(out) globs'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
diff --git a/t/t3103-ls-tree-misc.sh b/t/t3103-ls-tree-misc.sh
index 1452091..81c6343 100755
--- a/t/t3103-ls-tree-misc.sh
+++ b/t/t3103-ls-tree-misc.sh
@@ -7,6 +7,7 @@ Miscellaneous tests for git ls-tree.
 
 '
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -22,4 +23,19 @@ test_expect_success 'ls-tree fails with non-zero exit code on broken tree' '
 	test_must_fail git ls-tree -r HEAD
 '
 
+for opts in \
+	"--long --name-only" \
+	"--name-only --name-status" \
+	"--name-status --object-only" \
+	"--object-only --long"
+do
+	test_expect_success "usage: incompatible options: $opts" '
+		test_expect_code 129 git ls-tree $opts $tree
+	'
+
+	one_opt=$(echo "$opts" | cut -d' '  -f1)
+	test_expect_success "usage: incompatible options: $one_opt and --format" '
+		test_expect_code 129 git ls-tree $one_opt --format=fmt $tree
+	'
+done
 test_done
diff --git a/t/t3104-ls-tree-format.sh b/t/t3104-ls-tree-format.sh
new file mode 100755
index 0000000..3adb206
--- /dev/null
+++ b/t/t3104-ls-tree-format.sh
@@ -0,0 +1,80 @@
+#!/bin/sh
+
+test_description='ls-tree --format'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-t3100.sh
+
+test_expect_success 'ls-tree --format usage' '
+	test_expect_code 129 git ls-tree --format=fmt -l HEAD &&
+	test_expect_code 129 git ls-tree --format=fmt --name-only HEAD &&
+	test_expect_code 129 git ls-tree --format=fmt --name-status HEAD
+'
+
+test_expect_success 'setup' '
+	setup_basic_ls_tree_data
+'
+
+test_ls_tree_format () {
+	format=$1 &&
+	opts=$2 &&
+	fmtopts=$3 &&
+
+	test_expect_success "ls-tree '--format=<$format>' is like options '$opts $fmtopts'" '
+		git ls-tree $opts -r HEAD >expect &&
+		git ls-tree --format="$format" -r $fmtopts HEAD >actual &&
+		test_cmp expect actual
+	'
+
+	test_expect_success "ls-tree '--format=<$format>' on optimized v.s. non-optimized path" '
+		git ls-tree --format="$format" -r $fmtopts HEAD >expect &&
+		git ls-tree --format="> $format" -r $fmtopts HEAD >actual.raw &&
+		sed "s/^> //" >actual <actual.raw &&
+		test_cmp expect actual
+	'
+}
+
+test_expect_success "ls-tree --format='%(path) %(path) %(path)' HEAD top-file" '
+	git ls-tree --format="%(path) %(path) %(path)" HEAD top-file.t >actual &&
+	echo top-file.t top-file.t top-file.t >expect &&
+	test_cmp expect actual
+'
+
+test_ls_tree_format \
+	"%(objectmode) %(objecttype) %(objectname)%x09%(path)" \
+	""
+
+test_ls_tree_format \
+	"%(objectmode) %(objecttype) %(objectname) %(objectsize:padded)%x09%(path)" \
+	"--long"
+
+test_ls_tree_format \
+	"%(path)" \
+	"--name-only"
+
+test_ls_tree_format \
+	"%(objectname)" \
+	"--object-only"
+
+test_ls_tree_format \
+	"%(objectname)" \
+	"--object-only --abbrev" \
+	"--abbrev"
+
+test_ls_tree_format \
+	"%(objectmode) %(objecttype) %(objectname)%x09%(path)" \
+	"-t" \
+	"-t"
+
+test_ls_tree_format \
+	"%(objectmode) %(objecttype) %(objectname)%x09%(path)" \
+	"--full-name" \
+	"--full-name"
+
+test_ls_tree_format \
+	"%(objectmode) %(objecttype) %(objectname)%x09%(path)" \
+	"--full-tree" \
+	"--full-tree"
+
+test_done
diff --git a/t/t3105-ls-tree-output.sh b/t/t3105-ls-tree-output.sh
new file mode 100755
index 0000000..ce2391e
--- /dev/null
+++ b/t/t3105-ls-tree-output.sh
@@ -0,0 +1,192 @@
+#!/bin/sh
+
+test_description='ls-tree output'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-t3100.sh
+
+test_expect_success 'ls-tree --format usage' '
+	test_expect_code 129 git ls-tree --format=fmt -l HEAD &&
+	test_expect_code 129 git ls-tree --format=fmt --name-only HEAD &&
+	test_expect_code 129 git ls-tree --format=fmt --name-status HEAD
+'
+
+test_expect_success 'setup' '
+	setup_basic_ls_tree_data
+'
+
+test_ls_tree_format_mode_output () {
+	local opts="$1" &&
+	shift &&
+	cat >expect &&
+
+	while test $# -gt 0
+	do
+		local mode="$1" &&
+		shift &&
+
+		test_expect_success "'ls-tree $opts${mode:+ $mode}' output" '
+			git ls-tree ${mode:+$mode }$opts HEAD >actual &&
+			test_cmp expect actual
+		'
+
+		case "$opts" in
+		--full-tree)
+			test_expect_success "'ls-tree $opts${mode:+ $mode}' output (via subdir, fails)" '
+				test_must_fail git -C dir ls-tree --full-name ${mode:+$mode }$opts HEAD -- ../
+			'
+			;;
+		*)
+			test_expect_success "'ls-tree $opts${mode:+ $mode}' output (via subdir)" '
+				git -C dir ls-tree --full-name ${mode:+$mode }$opts HEAD -- ../ >actual &&
+				test_cmp expect actual
+			'
+			;;
+		esac
+	done
+}
+
+# test exact output of option (none, --long, ...) and mode (none and
+# -d, -r -t) and combinations
+test_expect_success 'setup: HEAD_* variables' '
+	HEAD_gitmodules=$(git rev-parse HEAD:.gitmodules) &&
+	HEAD_dir=$(git rev-parse HEAD:dir) &&
+	HEAD_top_file=$(git rev-parse HEAD:top-file.t) &&
+	HEAD_submodule=$(git rev-parse HEAD:submodule) &&
+	HEAD_dir_sub_file=$(git rev-parse HEAD:dir/sub-file.t)
+'
+## opt =
+test_ls_tree_format_mode_output "" "" "-t" <<-EOF
+	100644 blob $HEAD_gitmodules	.gitmodules
+	040000 tree $HEAD_dir	dir
+	160000 commit $HEAD_submodule	submodule
+	100644 blob $HEAD_top_file	top-file.t
+	EOF
+test_ls_tree_format_mode_output "" "-d" <<-EOF
+	040000 tree $HEAD_dir	dir
+	160000 commit $HEAD_submodule	submodule
+	EOF
+test_ls_tree_format_mode_output "" "-r" <<-EOF
+	100644 blob $HEAD_gitmodules	.gitmodules
+	100644 blob $HEAD_dir_sub_file	dir/sub-file.t
+	160000 commit $HEAD_submodule	submodule
+	100644 blob $HEAD_top_file	top-file.t
+	EOF
+## opt = --long
+test_ls_tree_format_mode_output "--long" "" "-t" <<-EOF
+	100644 blob $HEAD_gitmodules      61	.gitmodules
+	040000 tree $HEAD_dir       -	dir
+	160000 commit $HEAD_submodule       -	submodule
+	100644 blob $HEAD_top_file       9	top-file.t
+	EOF
+test_ls_tree_format_mode_output "--long" "-d" <<-EOF
+	040000 tree $HEAD_dir       -	dir
+	160000 commit $HEAD_submodule       -	submodule
+	EOF
+test_ls_tree_format_mode_output "--long" "-r" <<-EOF
+	100644 blob $HEAD_gitmodules      61	.gitmodules
+	100644 blob $HEAD_dir_sub_file      13	dir/sub-file.t
+	160000 commit $HEAD_submodule       -	submodule
+	100644 blob $HEAD_top_file       9	top-file.t
+	EOF
+## opt = --name-only
+test_ls_tree_format_mode_output "--name-only" "" "-t" <<-EOF
+	.gitmodules
+	dir
+	submodule
+	top-file.t
+	EOF
+test_ls_tree_format_mode_output "--name-only" "-d" <<-EOF
+	dir
+	submodule
+	EOF
+test_ls_tree_format_mode_output "--name-only" "-r" <<-EOF
+	.gitmodules
+	dir/sub-file.t
+	submodule
+	top-file.t
+	EOF
+## opt = --object-only
+test_ls_tree_format_mode_output "--object-only" "" "-t" <<-EOF
+	$HEAD_gitmodules
+	$HEAD_dir
+	$HEAD_submodule
+	$HEAD_top_file
+	EOF
+test_ls_tree_format_mode_output "--object-only" "-d" <<-EOF
+	$HEAD_dir
+	$HEAD_submodule
+	EOF
+test_ls_tree_format_mode_output "--object-only" "-r" <<-EOF
+	$HEAD_gitmodules
+	$HEAD_dir_sub_file
+	$HEAD_submodule
+	$HEAD_top_file
+	EOF
+## opt = --object-only --abbrev
+test_expect_success 'setup: HEAD_short_* variables' '
+	HEAD_short_gitmodules=$(git rev-parse --short HEAD:.gitmodules) &&
+	HEAD_short_dir=$(git rev-parse --short HEAD:dir) &&
+	HEAD_short_top_file=$(git rev-parse --short HEAD:top-file.t) &&
+	HEAD_short_submodule=$(git rev-parse --short HEAD:submodule) &&
+	HEAD_short_dir_sub_file=$(git rev-parse --short HEAD:dir/sub-file.t)
+'
+test_ls_tree_format_mode_output "--object-only --abbrev" "" "-t" <<-EOF
+	$HEAD_short_gitmodules
+	$HEAD_short_dir
+	$HEAD_short_submodule
+	$HEAD_short_top_file
+	EOF
+test_ls_tree_format_mode_output "--object-only --abbrev" "-d" <<-EOF
+	$HEAD_short_dir
+	$HEAD_short_submodule
+	EOF
+test_ls_tree_format_mode_output "--object-only --abbrev" "-r" <<-EOF
+	$HEAD_short_gitmodules
+	$HEAD_short_dir_sub_file
+	$HEAD_short_submodule
+	$HEAD_short_top_file
+	EOF
+## opt = --full-name
+test_ls_tree_format_mode_output "--full-name" "" <<-EOF
+	100644 blob $HEAD_gitmodules	.gitmodules
+	040000 tree $HEAD_dir	dir
+	160000 commit $HEAD_submodule	submodule
+	100644 blob $HEAD_top_file	top-file.t
+	EOF
+test_ls_tree_format_mode_output "--full-name" "-d" <<-EOF
+	040000 tree $HEAD_dir	dir
+	160000 commit $HEAD_submodule	submodule
+	EOF
+test_ls_tree_format_mode_output "--full-name" "-r" <<-EOF
+	100644 blob $HEAD_gitmodules	.gitmodules
+	100644 blob $HEAD_dir_sub_file	dir/sub-file.t
+	160000 commit $HEAD_submodule	submodule
+	100644 blob $HEAD_top_file	top-file.t
+	EOF
+test_ls_tree_format_mode_output "--full-name" "-t" <<-EOF
+	100644 blob $HEAD_gitmodules	.gitmodules
+	040000 tree $HEAD_dir	dir
+	160000 commit $HEAD_submodule	submodule
+	100644 blob $HEAD_top_file	top-file.t
+	EOF
+## opt = --full-tree
+test_ls_tree_format_mode_output "--full-tree" "" "-t" <<-EOF
+	100644 blob $HEAD_gitmodules	.gitmodules
+	040000 tree $HEAD_dir	dir
+	160000 commit $HEAD_submodule	submodule
+	100644 blob $HEAD_top_file	top-file.t
+	EOF
+test_ls_tree_format_mode_output "--full-tree" "-d" <<-EOF
+	040000 tree $HEAD_dir	dir
+	160000 commit $HEAD_submodule	submodule
+	EOF
+test_ls_tree_format_mode_output "--full-tree" "-r" <<-EOF
+	100644 blob $HEAD_gitmodules	.gitmodules
+	100644 blob $HEAD_dir_sub_file	dir/sub-file.t
+	160000 commit $HEAD_submodule	submodule
+	100644 blob $HEAD_top_file	top-file.t
+	EOF
+
+test_done
diff --git a/t/t3200-branch.sh b/t/t3200-branch.sh
index 4c07341..ccfa6a7 100755
--- a/t/t3200-branch.sh
+++ b/t/t3200-branch.sh
@@ -5,6 +5,10 @@
 
 test_description='git branch assorted tests'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-rebase.sh
 
@@ -12,6 +16,7 @@ test_expect_success 'prepare a trivial repository' '
 	echo Hello >A &&
 	git update-index --add A &&
 	git commit -m "Initial commit." &&
+	git branch -M main &&
 	echo World >>A &&
 	git update-index --add A &&
 	git commit -m "Second commit." &&
@@ -20,50 +25,70 @@ test_expect_success 'prepare a trivial repository' '
 
 test_expect_success 'git branch --help should not have created a bogus branch' '
 	test_might_fail git branch --man --help </dev/null >/dev/null 2>&1 &&
-	test_path_is_missing .git/refs/heads/--help
+	test_ref_missing refs/heads/--help
 '
 
-test_expect_success 'branch -h in broken repository' '
+test_expect_success REFFILES 'branch -h in broken repository' '
 	mkdir broken &&
 	(
 		cd broken &&
-		git init &&
-		>.git/refs/heads/master &&
+		git init -b main &&
+		>.git/refs/heads/main &&
 		test_expect_code 129 git branch -h >usage 2>&1
 	) &&
-	test_i18ngrep "[Uu]sage" broken/usage
+	test_grep "[Uu]sage" broken/usage
 '
 
 test_expect_success 'git branch abc should create a branch' '
-	git branch abc && test_path_is_file .git/refs/heads/abc
+	git branch abc &&
+	test_ref_exists refs/heads/abc
+'
+
+test_expect_success 'git branch abc should fail when abc exists' '
+	test_must_fail git branch abc
+'
+
+test_expect_success 'git branch --force abc should fail when abc is checked out' '
+	test_when_finished git switch main &&
+	git switch abc &&
+	test_must_fail git branch --force abc HEAD~1
+'
+
+test_expect_success 'git branch --force abc should succeed when abc exists' '
+	git rev-parse HEAD~1 >expect &&
+	git branch --force abc HEAD~1 &&
+	git rev-parse abc >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success 'git branch a/b/c should create a branch' '
-	git branch a/b/c && test_path_is_file .git/refs/heads/a/b/c
+	git branch a/b/c &&
+	test_ref_exists refs/heads/a/b/c
 '
 
-test_expect_success 'git branch mb master... should create a branch' '
-	git branch mb master... && test_path_is_file .git/refs/heads/mb
+test_expect_success 'git branch mb main... should create a branch' '
+	git branch mb main... &&
+	test_ref_exists refs/heads/mb
 '
 
 test_expect_success 'git branch HEAD should fail' '
 	test_must_fail git branch HEAD
 '
 
-cat >expect <<EOF
-$ZERO_OID $HEAD $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> 1117150200 +0000	branch: Created from master
-EOF
 test_expect_success 'git branch --create-reflog d/e/f should create a branch and a log' '
 	GIT_COMMITTER_DATE="2005-05-26 23:30" \
 	git -c core.logallrefupdates=false branch --create-reflog d/e/f &&
-	test_path_is_file .git/refs/heads/d/e/f &&
-	test_path_is_file .git/logs/refs/heads/d/e/f &&
-	test_cmp expect .git/logs/refs/heads/d/e/f
+	test_ref_exists refs/heads/d/e/f &&
+	cat >expect <<-EOF &&
+	$HEAD refs/heads/d/e/f@{0}: branch: Created from main
+	EOF
+	git reflog show --no-abbrev-commit refs/heads/d/e/f >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success 'git branch -d d/e/f should delete a branch and a log' '
 	git branch -d d/e/f &&
-	test_path_is_missing .git/refs/heads/d/e/f &&
+	test_ref_missing refs/heads/d/e/f &&
 	test_must_fail git reflog exists refs/heads/d/e/f
 '
 
@@ -81,7 +106,7 @@ test_expect_success 'git branch l should work after branch l/m has been deleted'
 
 test_expect_success 'git branch -m dumps usage' '
 	test_expect_code 128 git branch -m 2>err &&
-	test_i18ngrep "branch name required" err
+	test_grep "branch name required" err
 '
 
 test_expect_success 'git branch -m m broken_symref should work' '
@@ -110,7 +135,7 @@ test_expect_success 'git branch -m n/n n should work' '
 
 test_expect_success 'git branch -m bbb should rename checked out branch' '
 	test_when_finished git branch -D bbb &&
-	test_when_finished git checkout master &&
+	test_when_finished git checkout main &&
 	git checkout -b aaa &&
 	git commit --allow-empty -m "a new commit" &&
 	git rev-parse aaa@{0} >expect &&
@@ -124,7 +149,7 @@ test_expect_success 'git branch -m bbb should rename checked out branch' '
 
 test_expect_success 'renaming checked out branch works with d/f conflict' '
 	test_when_finished "git branch -D foo/bar || git branch -D foo" &&
-	test_when_finished git checkout master &&
+	test_when_finished git checkout main &&
 	git checkout -b foo &&
 	git branch -m foo/bar &&
 	git symbolic-ref HEAD >actual &&
@@ -164,6 +189,13 @@ test_expect_success 'git branch -M foo bar should fail when bar is checked out'
 	test_must_fail git branch -M bar foo
 '
 
+test_expect_success 'git branch -M foo bar should fail when bar is checked out in worktree' '
+	git branch -f bar &&
+	test_when_finished "git worktree remove wt && git branch -D wt" &&
+	git worktree add wt &&
+	test_must_fail git branch -M bar wt
+'
+
 test_expect_success 'git branch -M baz bam should succeed when baz is checked out' '
 	git checkout -b baz &&
 	git branch bam &&
@@ -171,29 +203,31 @@ test_expect_success 'git branch -M baz bam should succeed when baz is checked ou
 	test $(git rev-parse --abbrev-ref HEAD) = bam
 '
 
-test_expect_success 'git branch -M baz bam should add entries to .git/logs/HEAD' '
-	msg="Branch: renamed refs/heads/baz to refs/heads/bam" &&
-	grep " 0\{40\}.*$msg$" .git/logs/HEAD &&
-	grep "^0\{40\}.*$msg$" .git/logs/HEAD
+test_expect_success 'git branch -M baz bam should add entries to HEAD reflog' '
+	git reflog show HEAD >actual &&
+	grep "HEAD@{0}: Branch: renamed refs/heads/baz to refs/heads/bam" actual
 '
 
 test_expect_success 'git branch -M should leave orphaned HEAD alone' '
-	git init orphan &&
+	git init -b main orphan &&
 	(
 		cd orphan &&
 		test_commit initial &&
 		git checkout --orphan lonely &&
-		grep lonely .git/HEAD &&
-		test_path_is_missing .git/refs/head/lonely &&
-		git branch -M master mistress &&
-		grep lonely .git/HEAD
+		git symbolic-ref HEAD >expect &&
+		echo refs/heads/lonely >actual &&
+		test_cmp expect actual &&
+		test_ref_missing refs/head/lonely &&
+		git branch -M main mistress &&
+		git symbolic-ref HEAD >expect &&
+		test_cmp expect actual
 	)
 '
 
 test_expect_success 'resulting reflog can be shown by log -g' '
 	oid=$(git rev-parse HEAD) &&
 	cat >expect <<-EOF &&
-	HEAD@{0} $oid $msg
+	HEAD@{0} $oid Branch: renamed refs/heads/baz to refs/heads/bam
 	HEAD@{2} $oid checkout: moving from foo to baz
 	EOF
 	git log -g --format="%gd %H %gs" -2 HEAD >actual &&
@@ -201,7 +235,7 @@ test_expect_success 'resulting reflog can be shown by log -g' '
 '
 
 test_expect_success 'git branch -M baz bam should succeed when baz is checked out as linked working tree' '
-	git checkout master &&
+	git checkout main &&
 	git worktree add -b baz bazdir &&
 	git worktree add -f bazdir2 baz &&
 	git branch -M baz bam &&
@@ -211,33 +245,113 @@ test_expect_success 'git branch -M baz bam should succeed when baz is checked ou
 	git worktree prune
 '
 
+test_expect_success REFFILES 'git branch -M fails if updating any linked working tree fails' '
+	git worktree add -b baz bazdir1 &&
+	git worktree add -f bazdir2 baz &&
+	touch .git/worktrees/bazdir1/HEAD.lock &&
+	test_must_fail git branch -M baz bam &&
+	test $(git -C bazdir2 rev-parse --abbrev-ref HEAD) = bam &&
+	git branch -M bam baz &&
+	rm .git/worktrees/bazdir1/HEAD.lock &&
+	touch .git/worktrees/bazdir2/HEAD.lock &&
+	test_must_fail git branch -M baz bam &&
+	test $(git -C bazdir1 rev-parse --abbrev-ref HEAD) = bam &&
+	rm -rf bazdir1 bazdir2 &&
+	git worktree prune
+'
+
 test_expect_success 'git branch -M baz bam should succeed within a worktree in which baz is checked out' '
 	git checkout -b baz &&
 	git worktree add -f bazdir baz &&
 	(
 		cd bazdir &&
 		git branch -M baz bam &&
-		test $(git rev-parse --abbrev-ref HEAD) = bam
+		echo bam >expect &&
+		git rev-parse --abbrev-ref HEAD >actual &&
+		test_cmp expect actual
 	) &&
-	test $(git rev-parse --abbrev-ref HEAD) = bam &&
+	echo bam >expect &&
+	git rev-parse --abbrev-ref HEAD >actual &&
+	test_cmp expect actual &&
 	rm -r bazdir &&
 	git worktree prune
 '
 
-test_expect_success 'git branch -M master should work when master is checked out' '
-	git checkout master &&
-	git branch -M master
+test_expect_success 'git branch -M main should work when main is checked out' '
+	git checkout main &&
+	git branch -M main
 '
 
-test_expect_success 'git branch -M master master should work when master is checked out' '
-	git checkout master &&
-	git branch -M master master
+test_expect_success 'git branch -M main main should work when main is checked out' '
+	git checkout main &&
+	git branch -M main main
 '
 
-test_expect_success 'git branch -M master2 master2 should work when master is checked out' '
-	git checkout master &&
-	git branch master2 &&
-	git branch -M master2 master2
+test_expect_success 'git branch -M topic topic should work when main is checked out' '
+	git checkout main &&
+	git branch topic &&
+	git branch -M topic topic
+'
+
+test_expect_success 'git branch -M and -C fail on detached HEAD' '
+	git checkout HEAD^{} &&
+	test_when_finished git checkout - &&
+	echo "fatal: cannot rename the current branch while not on any" >expect &&
+	test_must_fail git branch -M must-fail 2>err &&
+	test_cmp expect err &&
+	echo "fatal: cannot copy the current branch while not on any" >expect &&
+	test_must_fail git branch -C must-fail 2>err &&
+	test_cmp expect err
+'
+
+test_expect_success 'git branch -m should work with orphan branches' '
+	test_when_finished git checkout - &&
+	test_when_finished git worktree remove -f wt &&
+	git worktree add wt --detach &&
+	# rename orphan in another worktreee
+	git -C wt checkout --orphan orphan-foo-wt &&
+	git branch -m orphan-foo-wt orphan-bar-wt &&
+	test orphan-bar-wt=$(git -C orphan-worktree branch --show-current) &&
+	# rename orphan in the current worktree
+	git checkout --orphan orphan-foo &&
+	git branch -m orphan-foo orphan-bar &&
+	test orphan-bar=$(git branch --show-current)
+'
+
+test_expect_success 'git branch -d on orphan HEAD (merged)' '
+	test_when_finished git checkout main &&
+	git checkout --orphan orphan &&
+	test_when_finished "rm -rf .git/objects/commit-graph*" &&
+	git commit-graph write --reachable &&
+	git branch --track to-delete main &&
+	git branch -d to-delete
+'
+
+test_expect_success 'git branch -d on orphan HEAD (merged, graph)' '
+	test_when_finished git checkout main &&
+	git checkout --orphan orphan &&
+	git branch --track to-delete main &&
+	git branch -d to-delete
+'
+
+test_expect_success 'git branch -d on orphan HEAD (unmerged)' '
+	test_when_finished git checkout main &&
+	git checkout --orphan orphan &&
+	test_when_finished "git branch -D to-delete" &&
+	git branch to-delete main &&
+	test_must_fail git branch -d to-delete 2>err &&
+	grep "not fully merged" err
+'
+
+test_expect_success 'git branch -d on orphan HEAD (unmerged, graph)' '
+	test_when_finished git checkout main &&
+	git checkout --orphan orphan &&
+	test_when_finished "git branch -D to-delete" &&
+	git branch to-delete main &&
+	test_when_finished "rm -rf .git/objects/commit-graph*" &&
+	git commit-graph write --reachable &&
+	test_must_fail git branch -d to-delete 2>err &&
+	grep "not fully merged" err
 '
 
 test_expect_success 'git branch -v -d t should work' '
@@ -278,6 +392,7 @@ test_expect_success 'deleting checked-out branch from repo that is a submodule'
 	git init repo1 &&
 	git init repo1/sub &&
 	test_commit -C repo1/sub x &&
+	test_config_global protocol.file.allow always &&
 	git -C repo1 submodule add ./sub &&
 	git -C repo1 commit -m "adding sub" &&
 
@@ -289,11 +404,11 @@ test_expect_success 'deleting checked-out branch from repo that is a submodule'
 test_expect_success 'bare main worktree has HEAD at branch deleted by secondary worktree' '
 	test_when_finished "rm -rf nonbare base secondary" &&
 
-	git init nonbare &&
+	git init -b main nonbare &&
 	test_commit -C nonbare x &&
 	git clone --bare nonbare bare &&
-	git -C bare worktree add --detach ../secondary master &&
-	git -C secondary branch -D master
+	git -C bare worktree add --detach ../secondary main &&
+	git -C secondary branch -D main
 '
 
 test_expect_success 'git branch --list -v with --abbrev' '
@@ -305,7 +420,9 @@ test_expect_success 'git branch --list -v with --abbrev' '
 
 	git branch -v --list --no-abbrev t >actual.noabbrev &&
 	git branch -v --list --abbrev=0 t >actual.0abbrev &&
+	git -c core.abbrev=no branch -v --list t >actual.noabbrev-conf &&
 	test_cmp actual.noabbrev actual.0abbrev &&
+	test_cmp actual.noabbrev actual.noabbrev-conf &&
 
 	git branch -v --list --abbrev=36 t >actual.36abbrev &&
 	# how many hexdigits are used?
@@ -323,10 +440,10 @@ test_expect_success 'git branch --list -v with --abbrev' '
 
 test_expect_success 'git branch --column' '
 	COLUMNS=81 git branch --column=column >actual &&
-	cat >expect <<\EOF &&
-  a/b/c     bam       foo       l       * master    mb        o/o       q
-  abc       bar       j/k       m/m       master2   n         o/p       r
-EOF
+	cat >expect <<-\EOF &&
+	  a/b/c   bam     foo     l     * main    n       o/p     r
+	  abc     bar     j/k     m/m     mb      o/o     q       topic
+	EOF
 	test_cmp expect actual
 '
 
@@ -336,25 +453,25 @@ test_expect_success 'git branch --column with an extremely long branch name' '
 	test_when_finished "git branch -d $long" &&
 	git branch $long &&
 	COLUMNS=80 git branch --column=column >actual &&
-	cat >expect <<EOF &&
-  a/b/c
-  abc
-  bam
-  bar
-  foo
-  j/k
-  l
-  m/m
-* master
-  master2
-  mb
-  n
-  o/o
-  o/p
-  q
-  r
-  $long
-EOF
+	cat >expect <<-EOF &&
+	  a/b/c
+	  abc
+	  bam
+	  bar
+	  foo
+	  j/k
+	  l
+	  m/m
+	* main
+	  mb
+	  n
+	  o/o
+	  o/p
+	  q
+	  r
+	  topic
+	  $long
+	EOF
 	test_cmp expect actual
 '
 
@@ -364,10 +481,10 @@ test_expect_success 'git branch with column.*' '
 	COLUMNS=80 git branch >actual &&
 	git config --unset column.branch &&
 	git config --unset column.ui &&
-	cat >expect <<\EOF &&
-  a/b/c   bam   foo   l   * master    mb   o/o   q
-  abc     bar   j/k   m/m   master2   n    o/p   r
-EOF
+	cat >expect <<-\EOF &&
+	  a/b/c   bam   foo   l   * main   n     o/p   r
+	  abc     bar   j/k   m/m   mb     o/o   q     topic
+	EOF
 	test_cmp expect actual
 '
 
@@ -377,41 +494,38 @@ test_expect_success 'git branch --column -v should fail' '
 
 test_expect_success 'git branch -v with column.ui ignored' '
 	git config column.ui column &&
-	COLUMNS=80 git branch -v | cut -c -10 | sed "s/ *$//" >actual &&
+	COLUMNS=80 git branch -v | cut -c -8 | sed "s/ *$//" >actual &&
 	git config --unset column.ui &&
-	cat >expect <<\EOF &&
-  a/b/c
-  abc
-  bam
-  bar
-  foo
-  j/k
-  l
-  m/m
-* master
-  master2
-  mb
-  n
-  o/o
-  o/p
-  q
-  r
-EOF
+	cat >expect <<-\EOF &&
+	  a/b/c
+	  abc
+	  bam
+	  bar
+	  foo
+	  j/k
+	  l
+	  m/m
+	* main
+	  mb
+	  n
+	  o/o
+	  o/p
+	  q
+	  r
+	  topic
+	EOF
 	test_cmp expect actual
 '
 
-mv .git/config .git/config-saved
-
-test_expect_success SHA1 'git branch -m q q2 without config should succeed' '
+test_expect_success DEFAULT_REPO_FORMAT 'git branch -m q q2 without config should succeed' '
+	test_when_finished mv .git/config-saved .git/config &&
+	mv .git/config .git/config-saved &&
 	git branch -m q q2 &&
 	git branch -m q2 q
 '
 
-mv .git/config-saved .git/config
-
-git config branch.s/s.dummy Hello
-
 test_expect_success 'git branch -m s/s s should work when s/t is deleted' '
+	git config branch.s/s.dummy Hello &&
 	git branch --create-reflog s/s &&
 	git reflog exists refs/heads/s/s &&
 	git branch --create-reflog s/t &&
@@ -427,8 +541,8 @@ test_expect_success 'config information was renamed, too' '
 '
 
 test_expect_success 'git branch -m correctly renames multiple config sections' '
-	test_when_finished "git checkout master" &&
-	git checkout -b source master &&
+	test_when_finished "git checkout main" &&
+	git checkout -b source main &&
 
 	# Assert that a config file with multiple config sections has
 	# those sections preserved...
@@ -462,19 +576,19 @@ EOF
 
 	# ...and that the comments for those sections are also
 	# preserved.
-	cat config.branch | sed "s/\"source\"/\"dest\"/" >expect &&
+	sed "s/\"source\"/\"dest\"/" config.branch >expect &&
 	sed -n -e "/Note the lack/,\$p" .git/config >actual &&
 	test_cmp expect actual
 '
 
 test_expect_success 'git branch -c dumps usage' '
 	test_expect_code 128 git branch -c 2>err &&
-	test_i18ngrep "branch name required" err
+	test_grep "branch name required" err
 '
 
 test_expect_success 'git branch --copy dumps usage' '
 	test_expect_code 128 git branch --copy 2>err &&
-	test_i18ngrep "branch name required" err
+	test_grep "branch name required" err
 '
 
 test_expect_success 'git branch -c d e should work' '
@@ -584,23 +698,24 @@ test_expect_success 'git branch -C c1 c2 should succeed when c1 is checked out'
 
 test_expect_success 'git branch -C c1 c2 should never touch HEAD' '
 	msg="Branch: copied refs/heads/c1 to refs/heads/c2" &&
-	! grep "$msg$" .git/logs/HEAD
+	git reflog HEAD >actual &&
+	! grep "$msg$" actual
 '
 
-test_expect_success 'git branch -C master should work when master is checked out' '
-	git checkout master &&
-	git branch -C master
+test_expect_success 'git branch -C main should work when main is checked out' '
+	git checkout main &&
+	git branch -C main
 '
 
-test_expect_success 'git branch -C master master should work when master is checked out' '
-	git checkout master &&
-	git branch -C master master
+test_expect_success 'git branch -C main main should work when main is checked out' '
+	git checkout main &&
+	git branch -C main main
 '
 
-test_expect_success 'git branch -C master5 master5 should work when master is checked out' '
-	git checkout master &&
-	git branch master5 &&
-	git branch -C master5 master5
+test_expect_success 'git branch -C main5 main5 should work when main is checked out' '
+	git checkout main &&
+	git branch main5 &&
+	git branch -C main5 main5
 '
 
 test_expect_success 'git branch -C ab cd should overwrite existing config for cd' '
@@ -620,8 +735,8 @@ test_expect_success 'git branch -C ab cd should overwrite existing config for cd
 test_expect_success 'git branch -c correctly copies multiple config sections' '
 	FOO=1 &&
 	export FOO &&
-	test_when_finished "git checkout master" &&
-	git checkout -b source2 master &&
+	test_when_finished "git checkout main" &&
+	git checkout -b source2 main &&
 
 	# Assert that a config file with multiple config sections has
 	# those sections preserved...
@@ -687,68 +802,61 @@ test_expect_success 'deleting a symref' '
 	git symbolic-ref refs/heads/symref refs/heads/target &&
 	echo "Deleted branch symref (was refs/heads/target)." >expect &&
 	git branch -d symref >actual &&
-	test_path_is_file .git/refs/heads/target &&
-	test_path_is_missing .git/refs/heads/symref &&
-	test_i18ncmp expect actual
+	test_ref_exists refs/heads/target &&
+	test_ref_missing refs/heads/symref &&
+	test_cmp expect actual
 '
 
 test_expect_success 'deleting a dangling symref' '
 	git symbolic-ref refs/heads/dangling-symref nowhere &&
-	test_path_is_file .git/refs/heads/dangling-symref &&
+	git symbolic-ref --no-recurse refs/heads/dangling-symref &&
 	echo "Deleted branch dangling-symref (was nowhere)." >expect &&
 	git branch -d dangling-symref >actual &&
-	test_path_is_missing .git/refs/heads/dangling-symref &&
-	test_i18ncmp expect actual
+	test_ref_missing refs/heads/dangling-symref &&
+	test_cmp expect actual
 '
 
 test_expect_success 'deleting a self-referential symref' '
 	git symbolic-ref refs/heads/self-reference refs/heads/self-reference &&
-	test_path_is_file .git/refs/heads/self-reference &&
+	test_ref_exists refs/heads/self-reference &&
 	echo "Deleted branch self-reference (was refs/heads/self-reference)." >expect &&
 	git branch -d self-reference >actual &&
-	test_path_is_missing .git/refs/heads/self-reference &&
-	test_i18ncmp expect actual
+	test_ref_missing refs/heads/self-reference &&
+	test_cmp expect actual
 '
 
 test_expect_success 'renaming a symref is not allowed' '
-	git symbolic-ref refs/heads/master2 refs/heads/master &&
-	test_must_fail git branch -m master2 master3 &&
-	git symbolic-ref refs/heads/master2 &&
-	test_path_is_file .git/refs/heads/master &&
-	test_path_is_missing .git/refs/heads/master3
-'
-
-test_expect_success SYMLINKS 'git branch -m u v should fail when the reflog for u is a symlink' '
-	git branch --create-reflog u &&
-	mv .git/logs/refs/heads/u real-u &&
-	ln -s real-u .git/logs/refs/heads/u &&
-	test_must_fail git branch -m u v
+	git symbolic-ref refs/heads/topic refs/heads/main &&
+	test_must_fail git branch -m topic new-topic &&
+	git symbolic-ref refs/heads/topic &&
+	test_ref_exists refs/heads/main &&
+	test_ref_missing refs/heads/new-topic
 '
 
 test_expect_success 'test tracking setup via --track' '
 	git config remote.local.url . &&
 	git config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
-	(git show-ref -q refs/remotes/local/master || git fetch local) &&
-	git branch --track my1 local/master &&
+	(git show-ref -q refs/remotes/local/main || git fetch local) &&
+	git branch --track my1 local/main &&
 	test $(git config branch.my1.remote) = local &&
-	test $(git config branch.my1.merge) = refs/heads/master
+	test $(git config branch.my1.merge) = refs/heads/main
 '
 
 test_expect_success 'test tracking setup (non-wildcard, matching)' '
 	git config remote.local.url . &&
-	git config remote.local.fetch refs/heads/master:refs/remotes/local/master &&
-	(git show-ref -q refs/remotes/local/master || git fetch local) &&
-	git branch --track my4 local/master &&
+	git config remote.local.fetch refs/heads/main:refs/remotes/local/main &&
+	(git show-ref -q refs/remotes/local/main || git fetch local) &&
+	git branch --track my4 local/main &&
 	test $(git config branch.my4.remote) = local &&
-	test $(git config branch.my4.merge) = refs/heads/master
+	test $(git config branch.my4.merge) = refs/heads/main
 '
 
 test_expect_success 'tracking setup fails on non-matching refspec' '
 	git config remote.local.url . &&
 	git config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
-	(git show-ref -q refs/remotes/local/master || git fetch local) &&
+	(git show-ref -q refs/remotes/local/main || git fetch local) &&
 	git config remote.local.fetch refs/heads/s:refs/remotes/local/s &&
-	test_must_fail git branch --track my5 local/master &&
+	test_must_fail git branch --track my5 local/main &&
 	test_must_fail git config branch.my5.remote &&
 	test_must_fail git config branch.my5.merge
 '
@@ -757,21 +865,21 @@ test_expect_success 'test tracking setup via config' '
 	git config branch.autosetupmerge true &&
 	git config remote.local.url . &&
 	git config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
-	(git show-ref -q refs/remotes/local/master || git fetch local) &&
-	git branch my3 local/master &&
+	(git show-ref -q refs/remotes/local/main || git fetch local) &&
+	git branch my3 local/main &&
 	test $(git config branch.my3.remote) = local &&
-	test $(git config branch.my3.merge) = refs/heads/master
+	test $(git config branch.my3.merge) = refs/heads/main
 '
 
 test_expect_success 'test overriding tracking setup via --no-track' '
 	git config branch.autosetupmerge true &&
 	git config remote.local.url . &&
 	git config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
-	(git show-ref -q refs/remotes/local/master || git fetch local) &&
-	git branch --no-track my2 local/master &&
+	(git show-ref -q refs/remotes/local/main || git fetch local) &&
+	git branch --no-track my2 local/main &&
 	git config branch.autosetupmerge false &&
 	! test "$(git config branch.my2.remote)" = local &&
-	! test "$(git config branch.my2.merge)" = refs/heads/master
+	! test "$(git config branch.my2.merge)" = refs/heads/main
 '
 
 test_expect_success 'no tracking without .fetch entries' '
@@ -802,13 +910,25 @@ test_expect_success 'test deleting branch without config' '
 	sha1=$(git rev-parse my7 | cut -c 1-7) &&
 	echo "Deleted branch my7 (was $sha1)." >expect &&
 	git branch -d my7 >actual 2>&1 &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 test_expect_success 'deleting currently checked out branch fails' '
 	git worktree add -b my7 my7 &&
 	test_must_fail git -C my7 branch -d my7 &&
-	test_must_fail git branch -d my7 &&
+	test_must_fail git branch -d my7 2>actual &&
+	grep "^error: cannot delete branch .my7. used by worktree at " actual &&
+	rm -r my7 &&
+	git worktree prune
+'
+
+test_expect_success 'deleting in-use branch fails' '
+	git worktree add my7 &&
+	test_commit -C my7 bt7 &&
+	git -C my7 bisect start HEAD HEAD~2 &&
+	test_must_fail git -C my7 branch -d my7 &&
+	test_must_fail git branch -d my7 2>actual &&
+	grep "^error: cannot delete branch .my7. used by worktree at " actual &&
 	rm -r my7 &&
 	git worktree prune
 '
@@ -834,35 +954,70 @@ test_expect_success 'branch from tag w/--track causes failure' '
 	test_must_fail git branch --track my11 foobar
 '
 
+test_expect_success 'simple tracking works when remote branch name matches' '
+	test_when_finished "rm -rf otherserver" &&
+	git init otherserver &&
+	test_commit -C otherserver my_commit 1 &&
+	git -C otherserver branch feature &&
+	test_config branch.autosetupmerge simple &&
+	test_config remote.otherserver.url otherserver &&
+	test_config remote.otherserver.fetch refs/heads/*:refs/remotes/otherserver/* &&
+	git fetch otherserver &&
+	git branch feature otherserver/feature &&
+	test_cmp_config otherserver branch.feature.remote &&
+	test_cmp_config refs/heads/feature branch.feature.merge
+'
+
+test_expect_success 'simple tracking skips when remote branch name does not match' '
+	test_config branch.autosetupmerge simple &&
+	test_config remote.local.url . &&
+	test_config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
+	git fetch local &&
+	git branch my-other local/main &&
+	test_cmp_config "" --default "" branch.my-other.remote &&
+	test_cmp_config "" --default "" branch.my-other.merge
+'
+
+test_expect_success 'simple tracking skips when remote ref is not a branch' '
+	test_config branch.autosetupmerge simple &&
+	test_config remote.localtags.url . &&
+	test_config remote.localtags.fetch refs/tags/*:refs/remotes/localtags/* &&
+	git tag mytag12 main &&
+	git fetch localtags &&
+	git branch mytag12 localtags/mytag12 &&
+	test_cmp_config "" --default "" branch.mytag12.remote &&
+	test_cmp_config "" --default "" branch.mytag12.merge
+'
+
 test_expect_success '--set-upstream-to fails on multiple branches' '
 	echo "fatal: too many arguments to set new upstream" >expect &&
-	test_must_fail git branch --set-upstream-to master a b c 2>err &&
-	test_i18ncmp expect err
+	test_must_fail git branch --set-upstream-to main a b c 2>err &&
+	test_cmp expect err
 '
 
 test_expect_success '--set-upstream-to fails on detached HEAD' '
 	git checkout HEAD^{} &&
 	test_when_finished git checkout - &&
-	echo "fatal: could not set upstream of HEAD to master when it does not point to any branch." >expect &&
-	test_must_fail git branch --set-upstream-to master 2>err &&
-	test_i18ncmp expect err
+	echo "fatal: could not set upstream of HEAD to main when it does not point to any branch" >expect &&
+	test_must_fail git branch --set-upstream-to main 2>err &&
+	test_cmp expect err
 '
 
 test_expect_success '--set-upstream-to fails on a missing dst branch' '
 	echo "fatal: branch '"'"'does-not-exist'"'"' does not exist" >expect &&
-	test_must_fail git branch --set-upstream-to master does-not-exist 2>err &&
-	test_i18ncmp expect err
+	test_must_fail git branch --set-upstream-to main does-not-exist 2>err &&
+	test_cmp expect err
 '
 
 test_expect_success '--set-upstream-to fails on a missing src branch' '
-	test_must_fail git branch --set-upstream-to does-not-exist master 2>err &&
-	test_i18ngrep "the requested upstream branch '"'"'does-not-exist'"'"' does not exist" err
+	test_must_fail git branch --set-upstream-to does-not-exist main 2>err &&
+	test_grep "the requested upstream branch '"'"'does-not-exist'"'"' does not exist" err
 '
 
 test_expect_success '--set-upstream-to fails on a non-ref' '
-	echo "fatal: Cannot setup tracking information; starting point '"'"'HEAD^{}'"'"' is not a branch." >expect &&
+	echo "fatal: cannot set up tracking information; starting point '"'"'HEAD^{}'"'"' is not a branch" >expect &&
 	test_must_fail git branch --set-upstream-to HEAD^{} 2>err &&
-	test_i18ncmp expect err
+	test_cmp expect err
 '
 
 test_expect_success '--set-upstream-to fails on locked config' '
@@ -870,30 +1025,30 @@ test_expect_success '--set-upstream-to fails on locked config' '
 	>.git/config.lock &&
 	git branch locked &&
 	test_must_fail git branch --set-upstream-to locked 2>err &&
-	test_i18ngrep "could not lock config file .git/config" err
+	test_grep "could not lock config file .git/config" err
 '
 
 test_expect_success 'use --set-upstream-to modify HEAD' '
-	test_config branch.master.remote foo &&
-	test_config branch.master.merge foo &&
+	test_config branch.main.remote foo &&
+	test_config branch.main.merge foo &&
 	git branch my12 &&
 	git branch --set-upstream-to my12 &&
-	test "$(git config branch.master.remote)" = "." &&
-	test "$(git config branch.master.merge)" = "refs/heads/my12"
+	test "$(git config branch.main.remote)" = "." &&
+	test "$(git config branch.main.merge)" = "refs/heads/my12"
 '
 
 test_expect_success 'use --set-upstream-to modify a particular branch' '
 	git branch my13 &&
-	git branch --set-upstream-to master my13 &&
+	git branch --set-upstream-to main my13 &&
 	test_when_finished "git branch --unset-upstream my13" &&
 	test "$(git config branch.my13.remote)" = "." &&
-	test "$(git config branch.my13.merge)" = "refs/heads/master"
+	test "$(git config branch.my13.merge)" = "refs/heads/main"
 '
 
 test_expect_success '--unset-upstream should fail if given a non-existent branch' '
-	echo "fatal: Branch '"'"'i-dont-exist'"'"' has no upstream information" >expect &&
+	echo "fatal: branch '"'"'i-dont-exist'"'"' has no upstream information" >expect &&
 	test_must_fail git branch --unset-upstream i-dont-exist 2>err &&
-	test_i18ncmp expect err
+	test_cmp expect err
 '
 
 test_expect_success '--unset-upstream should fail if config is locked' '
@@ -901,99 +1056,113 @@ test_expect_success '--unset-upstream should fail if config is locked' '
 	git branch --set-upstream-to locked &&
 	>.git/config.lock &&
 	test_must_fail git branch --unset-upstream 2>err &&
-	test_i18ngrep "could not lock config file .git/config" err
+	test_grep "could not lock config file .git/config" err
 '
 
 test_expect_success 'test --unset-upstream on HEAD' '
 	git branch my14 &&
-	test_config branch.master.remote foo &&
-	test_config branch.master.merge foo &&
+	test_config branch.main.remote foo &&
+	test_config branch.main.merge foo &&
 	git branch --set-upstream-to my14 &&
 	git branch --unset-upstream &&
-	test_must_fail git config branch.master.remote &&
-	test_must_fail git config branch.master.merge &&
+	test_must_fail git config branch.main.remote &&
+	test_must_fail git config branch.main.merge &&
 	# fail for a branch without upstream set
-	echo "fatal: Branch '"'"'master'"'"' has no upstream information" >expect &&
+	echo "fatal: branch '"'"'main'"'"' has no upstream information" >expect &&
 	test_must_fail git branch --unset-upstream 2>err &&
-	test_i18ncmp expect err
+	test_cmp expect err
 '
 
 test_expect_success '--unset-upstream should fail on multiple branches' '
 	echo "fatal: too many arguments to unset upstream" >expect &&
 	test_must_fail git branch --unset-upstream a b c 2>err &&
-	test_i18ncmp expect err
+	test_cmp expect err
 '
 
 test_expect_success '--unset-upstream should fail on detached HEAD' '
 	git checkout HEAD^{} &&
 	test_when_finished git checkout - &&
-	echo "fatal: could not unset upstream of HEAD when it does not point to any branch." >expect &&
+	echo "fatal: could not unset upstream of HEAD when it does not point to any branch" >expect &&
 	test_must_fail git branch --unset-upstream 2>err &&
-	test_i18ncmp expect err
+	test_cmp expect err
 '
 
 test_expect_success 'test --unset-upstream on a particular branch' '
 	git branch my15 &&
-	git branch --set-upstream-to master my14 &&
+	git branch --set-upstream-to main my14 &&
 	git branch --unset-upstream my14 &&
 	test_must_fail git config branch.my14.remote &&
 	test_must_fail git config branch.my14.merge
 '
 
 test_expect_success 'disabled option --set-upstream fails' '
-	test_must_fail git branch --set-upstream origin/master
+	test_must_fail git branch --set-upstream origin/main
 '
 
-test_expect_success '--set-upstream-to notices an error to set branch as own upstream' '
+test_expect_success '--set-upstream-to notices an error to set branch as own upstream' "
 	git branch --set-upstream-to refs/heads/my13 my13 2>actual &&
 	cat >expect <<-\EOF &&
-	warning: Not setting branch my13 as its own upstream.
+	warning: not setting branch 'my13' as its own upstream
 	EOF
 	test_expect_code 1 git config branch.my13.remote &&
 	test_expect_code 1 git config branch.my13.merge &&
-	test_i18ncmp expect actual
-'
+	test_cmp expect actual
+"
 
-# Keep this test last, as it changes the current branch
-cat >expect <<EOF
-$ZERO_OID $HEAD $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> 1117150200 +0000	branch: Created from master
-EOF
 test_expect_success 'git checkout -b g/h/i -l should create a branch and a log' '
+	test_when_finished git checkout main &&
 	GIT_COMMITTER_DATE="2005-05-26 23:30" \
-	git checkout -b g/h/i -l master &&
-	test_path_is_file .git/refs/heads/g/h/i &&
-	test_path_is_file .git/logs/refs/heads/g/h/i &&
-	test_cmp expect .git/logs/refs/heads/g/h/i
+	git checkout -b g/h/i -l main &&
+	test_ref_exists refs/heads/g/h/i &&
+	cat >expect <<-EOF &&
+	$HEAD refs/heads/g/h/i@{0}: branch: Created from main
+	EOF
+	git reflog show --no-abbrev-commit refs/heads/g/h/i >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success 'checkout -b makes reflog by default' '
-	git checkout master &&
+	git checkout main &&
 	git config --unset core.logAllRefUpdates &&
 	git checkout -b alpha &&
 	git rev-parse --verify alpha@{0}
 '
 
 test_expect_success 'checkout -b does not make reflog when core.logAllRefUpdates = false' '
-	git checkout master &&
+	git checkout main &&
 	git config core.logAllRefUpdates false &&
 	git checkout -b beta &&
 	test_must_fail git rev-parse --verify beta@{0}
 '
 
 test_expect_success 'checkout -b with -l makes reflog when core.logAllRefUpdates = false' '
-	git checkout master &&
+	git checkout main &&
 	git checkout -lb gamma &&
 	git config --unset core.logAllRefUpdates &&
 	git rev-parse --verify gamma@{0}
 '
 
-test_expect_success 'avoid ambiguous track' '
+test_expect_success 'avoid ambiguous track and advise' '
 	git config branch.autosetupmerge true &&
 	git config remote.ambi1.url lalala &&
-	git config remote.ambi1.fetch refs/heads/lalala:refs/heads/master &&
+	git config remote.ambi1.fetch refs/heads/lalala:refs/heads/main &&
 	git config remote.ambi2.url lilili &&
-	git config remote.ambi2.fetch refs/heads/lilili:refs/heads/master &&
-	test_must_fail git branch all1 master &&
+	git config remote.ambi2.fetch refs/heads/lilili:refs/heads/main &&
+	cat <<-EOF >expected &&
+	fatal: not tracking: ambiguous information for ref '\''refs/heads/main'\''
+	hint: There are multiple remotes whose fetch refspecs map to the remote
+	hint: tracking ref '\''refs/heads/main'\'':
+	hint:   ambi1
+	hint:   ambi2
+	hint:
+	hint: This is typically a configuration error.
+	hint:
+	hint: To support setting up tracking branches, ensure that
+	hint: different remotes'\'' fetch refspecs map into different
+	hint: tracking namespaces.
+	EOF
+	test_must_fail git branch all1 main 2>actual &&
+	test_cmp expected actual &&
 	test -z "$(git config branch.all1.merge)"
 '
 
@@ -1049,10 +1218,10 @@ test_expect_success 'autosetuprebase local on a tracked remote branch' '
 	git config remote.local.url . &&
 	git config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
 	git config branch.autosetuprebase local &&
-	(git show-ref -q refs/remotes/local/master || git fetch local) &&
-	git branch --track myr5 local/master &&
+	(git show-ref -q refs/remotes/local/main || git fetch local) &&
+	git branch --track myr5 local/main &&
 	test "$(git config branch.myr5.remote)" = local &&
-	test "$(git config branch.myr5.merge)" = refs/heads/master &&
+	test "$(git config branch.myr5.merge)" = refs/heads/main &&
 	! test "$(git config branch.myr5.rebase)" = true
 '
 
@@ -1060,10 +1229,10 @@ test_expect_success 'autosetuprebase never on a tracked remote branch' '
 	git config remote.local.url . &&
 	git config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
 	git config branch.autosetuprebase never &&
-	(git show-ref -q refs/remotes/local/master || git fetch local) &&
-	git branch --track myr6 local/master &&
+	(git show-ref -q refs/remotes/local/main || git fetch local) &&
+	git branch --track myr6 local/main &&
 	test "$(git config branch.myr6.remote)" = local &&
-	test "$(git config branch.myr6.merge)" = refs/heads/master &&
+	test "$(git config branch.myr6.merge)" = refs/heads/main &&
 	! test "$(git config branch.myr6.rebase)" = true
 '
 
@@ -1071,10 +1240,10 @@ test_expect_success 'autosetuprebase remote on a tracked remote branch' '
 	git config remote.local.url . &&
 	git config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
 	git config branch.autosetuprebase remote &&
-	(git show-ref -q refs/remotes/local/master || git fetch local) &&
-	git branch --track myr7 local/master &&
+	(git show-ref -q refs/remotes/local/main || git fetch local) &&
+	git branch --track myr7 local/main &&
 	test "$(git config branch.myr7.remote)" = local &&
-	test "$(git config branch.myr7.merge)" = refs/heads/master &&
+	test "$(git config branch.myr7.merge)" = refs/heads/main &&
 	test "$(git config branch.myr7.rebase)" = true
 '
 
@@ -1082,10 +1251,10 @@ test_expect_success 'autosetuprebase always on a tracked remote branch' '
 	git config remote.local.url . &&
 	git config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
 	git config branch.autosetuprebase remote &&
-	(git show-ref -q refs/remotes/local/master || git fetch local) &&
-	git branch --track myr8 local/master &&
+	(git show-ref -q refs/remotes/local/main || git fetch local) &&
+	git branch --track myr8 local/main &&
 	test "$(git config branch.myr8.remote)" = local &&
-	test "$(git config branch.myr8.merge)" = refs/heads/master &&
+	test "$(git config branch.myr8.merge)" = refs/heads/main &&
 	test "$(git config branch.myr8.rebase)" = true
 '
 
@@ -1093,10 +1262,10 @@ test_expect_success 'autosetuprebase unconfigured on a tracked remote branch' '
 	git config --unset branch.autosetuprebase &&
 	git config remote.local.url . &&
 	git config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
-	(git show-ref -q refs/remotes/local/master || git fetch local) &&
-	git branch --track myr9 local/master &&
+	(git show-ref -q refs/remotes/local/main || git fetch local) &&
+	git branch --track myr9 local/main &&
 	test "$(git config branch.myr9.remote)" = local &&
-	test "$(git config branch.myr9.merge)" = refs/heads/master &&
+	test "$(git config branch.myr9.merge)" = refs/heads/main &&
 	test "z$(git config branch.myr9.rebase)" = z
 '
 
@@ -1114,7 +1283,7 @@ test_expect_success 'autosetuprebase unconfigured on a tracked local branch' '
 test_expect_success 'autosetuprebase unconfigured on untracked local branch' '
 	git config remote.local.url . &&
 	git config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
-	(git show-ref -q refs/remotes/local/master || git fetch local) &&
+	(git show-ref -q refs/remotes/local/main || git fetch local) &&
 	git branch --no-track myr11 mybase2 &&
 	test "z$(git config branch.myr11.remote)" = z &&
 	test "z$(git config branch.myr11.merge)" = z &&
@@ -1124,8 +1293,8 @@ test_expect_success 'autosetuprebase unconfigured on untracked local branch' '
 test_expect_success 'autosetuprebase unconfigured on untracked remote branch' '
 	git config remote.local.url . &&
 	git config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
-	(git show-ref -q refs/remotes/local/master || git fetch local) &&
-	git branch --no-track myr12 local/master &&
+	(git show-ref -q refs/remotes/local/main || git fetch local) &&
+	git branch --no-track myr12 local/main &&
 	test "z$(git config branch.myr12.remote)" = z &&
 	test "z$(git config branch.myr12.merge)" = z &&
 	test "z$(git config branch.myr12.rebase)" = z
@@ -1135,7 +1304,7 @@ test_expect_success 'autosetuprebase never on an untracked local branch' '
 	git config branch.autosetuprebase never &&
 	git config remote.local.url . &&
 	git config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
-	(git show-ref -q refs/remotes/local/master || git fetch local) &&
+	(git show-ref -q refs/remotes/local/main || git fetch local) &&
 	git branch --no-track myr13 mybase2 &&
 	test "z$(git config branch.myr13.remote)" = z &&
 	test "z$(git config branch.myr13.merge)" = z &&
@@ -1146,7 +1315,7 @@ test_expect_success 'autosetuprebase local on an untracked local branch' '
 	git config branch.autosetuprebase local &&
 	git config remote.local.url . &&
 	git config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
-	(git show-ref -q refs/remotes/local/master || git fetch local) &&
+	(git show-ref -q refs/remotes/local/main || git fetch local) &&
 	git branch --no-track myr14 mybase2 &&
 	test "z$(git config branch.myr14.remote)" = z &&
 	test "z$(git config branch.myr14.merge)" = z &&
@@ -1157,7 +1326,7 @@ test_expect_success 'autosetuprebase remote on an untracked local branch' '
 	git config branch.autosetuprebase remote &&
 	git config remote.local.url . &&
 	git config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
-	(git show-ref -q refs/remotes/local/master || git fetch local) &&
+	(git show-ref -q refs/remotes/local/main || git fetch local) &&
 	git branch --no-track myr15 mybase2 &&
 	test "z$(git config branch.myr15.remote)" = z &&
 	test "z$(git config branch.myr15.merge)" = z &&
@@ -1168,7 +1337,7 @@ test_expect_success 'autosetuprebase always on an untracked local branch' '
 	git config branch.autosetuprebase always &&
 	git config remote.local.url . &&
 	git config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
-	(git show-ref -q refs/remotes/local/master || git fetch local) &&
+	(git show-ref -q refs/remotes/local/main || git fetch local) &&
 	git branch --no-track myr16 mybase2 &&
 	test "z$(git config branch.myr16.remote)" = z &&
 	test "z$(git config branch.myr16.merge)" = z &&
@@ -1179,8 +1348,8 @@ test_expect_success 'autosetuprebase never on an untracked remote branch' '
 	git config branch.autosetuprebase never &&
 	git config remote.local.url . &&
 	git config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
-	(git show-ref -q refs/remotes/local/master || git fetch local) &&
-	git branch --no-track myr17 local/master &&
+	(git show-ref -q refs/remotes/local/main || git fetch local) &&
+	git branch --no-track myr17 local/main &&
 	test "z$(git config branch.myr17.remote)" = z &&
 	test "z$(git config branch.myr17.merge)" = z &&
 	test "z$(git config branch.myr17.rebase)" = z
@@ -1190,8 +1359,8 @@ test_expect_success 'autosetuprebase local on an untracked remote branch' '
 	git config branch.autosetuprebase local &&
 	git config remote.local.url . &&
 	git config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
-	(git show-ref -q refs/remotes/local/master || git fetch local) &&
-	git branch --no-track myr18 local/master &&
+	(git show-ref -q refs/remotes/local/main || git fetch local) &&
+	git branch --no-track myr18 local/main &&
 	test "z$(git config branch.myr18.remote)" = z &&
 	test "z$(git config branch.myr18.merge)" = z &&
 	test "z$(git config branch.myr18.rebase)" = z
@@ -1201,8 +1370,8 @@ test_expect_success 'autosetuprebase remote on an untracked remote branch' '
 	git config branch.autosetuprebase remote &&
 	git config remote.local.url . &&
 	git config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
-	(git show-ref -q refs/remotes/local/master || git fetch local) &&
-	git branch --no-track myr19 local/master &&
+	(git show-ref -q refs/remotes/local/main || git fetch local) &&
+	git branch --no-track myr19 local/main &&
 	test "z$(git config branch.myr19.remote)" = z &&
 	test "z$(git config branch.myr19.merge)" = z &&
 	test "z$(git config branch.myr19.rebase)" = z
@@ -1212,8 +1381,8 @@ test_expect_success 'autosetuprebase always on an untracked remote branch' '
 	git config branch.autosetuprebase always &&
 	git config remote.local.url . &&
 	git config remote.local.fetch refs/heads/*:refs/remotes/local/* &&
-	(git show-ref -q refs/remotes/local/master || git fetch local) &&
-	git branch --no-track myr20 local/master &&
+	(git show-ref -q refs/remotes/local/main || git fetch local) &&
+	git branch --no-track myr20 local/main &&
 	test "z$(git config branch.myr20.remote)" = z &&
 	test "z$(git config branch.myr20.merge)" = z &&
 	test "z$(git config branch.myr20.rebase)" = z
@@ -1221,7 +1390,7 @@ test_expect_success 'autosetuprebase always on an untracked remote branch' '
 
 test_expect_success 'autosetuprebase always on detached HEAD' '
 	git config branch.autosetupmerge always &&
-	test_when_finished git checkout master &&
+	test_when_finished git checkout main &&
 	git checkout HEAD^0 &&
 	git branch my11 &&
 	test -z "$(git config branch.my11.remote)" &&
@@ -1249,24 +1418,40 @@ test_expect_success 'attempt to delete a branch without base and unmerged to HEA
 test_expect_success 'attempt to delete a branch merged to its base' '
 	# we are on my9 which is the initial commit; traditionally
 	# we would not have allowed deleting my8 that is not merged
-	# to my9, but it is set to track master that already has my8
-	git config branch.my8.merge refs/heads/master &&
+	# to my9, but it is set to track main that already has my8
+	git config branch.my8.merge refs/heads/main &&
 	git branch -d my8
 '
 
 test_expect_success 'attempt to delete a branch merged to its base' '
-	git checkout master &&
+	git checkout main &&
 	echo Third >>A &&
 	git commit -m "Third commit" A &&
 	git branch -t my10 my9 &&
 	git branch -f my10 HEAD^ &&
-	# we are on master which is at the third commit, and my10
+	# we are on main which is at the third commit, and my10
 	# is behind us, so traditionally we would have allowed deleting
 	# it; but my10 is set to track my9 that is further behind.
 	test_must_fail git branch -d my10
 '
 
+test_expect_success 'branch --delete --force removes dangling branch' '
+	git checkout main &&
+	test_commit unstable &&
+	hash=$(git rev-parse HEAD) &&
+	objpath=$(echo $hash | sed -e "s|^..|.git/objects/&/|") &&
+	git branch --no-track dangling &&
+	mv $objpath $objpath.x &&
+	test_when_finished "mv $objpath.x $objpath" &&
+	git branch --delete --force dangling &&
+	git for-each-ref refs/heads/dangling >actual &&
+	test_must_be_empty actual
+'
+
 test_expect_success 'use --edit-description' '
+	EDITOR=: git branch --edit-description &&
+	test_expect_code 1 git config branch.main.description &&
+
 	write_script editor <<-\EOF &&
 		echo "New contents" >"$1"
 	EOF
@@ -1287,6 +1472,7 @@ test_expect_success 'detect typo in branch name when using --edit-description' '
 '
 
 test_expect_success 'refuse --edit-description on unborn branch for now' '
+	test_when_finished "git checkout main" &&
 	write_script editor <<-\EOF &&
 		echo "New contents" >"$1"
 	EOF
@@ -1298,46 +1484,42 @@ test_expect_success '--merged catches invalid object names' '
 	test_must_fail git branch --merged 0000000000000000000000000000000000000000
 '
 
-test_expect_success '--merged is incompatible with --no-merged' '
-	test_must_fail git branch --merged HEAD --no-merged HEAD
-'
-
 test_expect_success '--list during rebase' '
 	test_when_finished "reset_rebase" &&
-	git checkout master &&
+	git checkout main &&
 	FAKE_LINES="1 edit 2" &&
 	export FAKE_LINES &&
 	set_fake_editor &&
 	git rebase -i HEAD~2 &&
 	git branch --list >actual &&
-	test_i18ngrep "rebasing master" actual
+	test_grep "rebasing main" actual
 '
 
 test_expect_success '--list during rebase from detached HEAD' '
-	test_when_finished "reset_rebase && git checkout master" &&
-	git checkout master^0 &&
+	test_when_finished "reset_rebase && git checkout main" &&
+	git checkout main^0 &&
 	oid=$(git rev-parse --short HEAD) &&
 	FAKE_LINES="1 edit 2" &&
 	export FAKE_LINES &&
 	set_fake_editor &&
 	git rebase -i HEAD~2 &&
 	git branch --list >actual &&
-	test_i18ngrep "rebasing detached HEAD $oid" actual
+	test_grep "rebasing detached HEAD $oid" actual
 '
 
 test_expect_success 'tracking with unexpected .fetch refspec' '
 	rm -rf a b c d &&
-	git init a &&
+	git init -b main a &&
 	(
 		cd a &&
 		test_commit a
 	) &&
-	git init b &&
+	git init -b main b &&
 	(
 		cd b &&
 		test_commit b
 	) &&
-	git init c &&
+	git init -b main c &&
 	(
 		cd c &&
 		test_commit c &&
@@ -1345,26 +1527,27 @@ test_expect_success 'tracking with unexpected .fetch refspec' '
 		git remote add b ../b &&
 		git fetch --all
 	) &&
-	git init d &&
+	git init -b main d &&
 	(
 		cd d &&
 		git remote add c ../c &&
 		git config remote.c.fetch "+refs/remotes/*:refs/remotes/*" &&
 		git fetch c &&
-		git branch --track local/a/master remotes/a/master &&
-		test "$(git config branch.local/a/master.remote)" = "c" &&
-		test "$(git config branch.local/a/master.merge)" = "refs/remotes/a/master" &&
+		git branch --track local/a/main remotes/a/main &&
+		test "$(git config branch.local/a/main.remote)" = "c" &&
+		test "$(git config branch.local/a/main.merge)" = "refs/remotes/a/main" &&
 		git rev-parse --verify a >expect &&
-		git rev-parse --verify local/a/master >actual &&
+		git rev-parse --verify local/a/main >actual &&
 		test_cmp expect actual
 	)
 '
 
 test_expect_success 'configured committerdate sort' '
-	git init sort &&
+	git init -b main sort &&
+	test_config -C sort branch.sort "committerdate" &&
+
 	(
 		cd sort &&
-		git config branch.sort committerdate &&
 		test_commit initial &&
 		git checkout -b a &&
 		test_commit a &&
@@ -1374,7 +1557,7 @@ test_expect_success 'configured committerdate sort' '
 		test_commit b &&
 		git branch >actual &&
 		cat >expect <<-\EOF &&
-		  master
+		  main
 		  a
 		  c
 		* b
@@ -1384,26 +1567,140 @@ test_expect_success 'configured committerdate sort' '
 '
 
 test_expect_success 'option override configured sort' '
+	test_config -C sort branch.sort "committerdate" &&
+
 	(
 		cd sort &&
-		git config branch.sort committerdate &&
 		git branch --sort=refname >actual &&
 		cat >expect <<-\EOF &&
 		  a
 		* b
 		  c
-		  master
+		  main
+		EOF
+		test_cmp expect actual
+	)
+'
+
+test_expect_success '--no-sort cancels config sort keys' '
+	test_config -C sort branch.sort "-refname" &&
+
+	(
+		cd sort &&
+
+		# objecttype is identical for all of them, so sort falls back on
+		# default (ascending refname)
+		git branch \
+			--no-sort \
+			--sort="objecttype" >actual &&
+		cat >expect <<-\EOF &&
+		  a
+		* b
+		  c
+		  main
+		EOF
+		test_cmp expect actual
+	)
+
+'
+
+test_expect_success '--no-sort cancels command line sort keys' '
+	(
+		cd sort &&
+
+		# objecttype is identical for all of them, so sort falls back on
+		# default (ascending refname)
+		git branch \
+			--sort="-refname" \
+			--no-sort \
+			--sort="objecttype" >actual &&
+		cat >expect <<-\EOF &&
+		  a
+		* b
+		  c
+		  main
+		EOF
+		test_cmp expect actual
+	)
+'
+
+test_expect_success '--no-sort without subsequent --sort prints expected branches' '
+	(
+		cd sort &&
+
+		# Sort the results with `sort` for a consistent comparison
+		# against expected
+		git branch --no-sort | sort >actual &&
+		cat >expect <<-\EOF &&
+		  a
+		  c
+		  main
+		* b
 		EOF
 		test_cmp expect actual
 	)
 '
 
 test_expect_success 'invalid sort parameter in configuration' '
+	test_config -C sort branch.sort "v:notvalid" &&
+
 	(
 		cd sort &&
-		git config branch.sort "v:notvalid" &&
-		test_must_fail git branch
+
+		# this works in the "listing" mode, so bad sort key
+		# is a dying offence.
+		test_must_fail git branch &&
+
+		# these do not need to use sorting, and should all
+		# succeed
+		git branch newone main &&
+		git branch -c newone newerone &&
+		git branch -m newone newestone &&
+		git branch -d newerone newestone
 	)
 '
 
+test_expect_success 'tracking info copied with --track=inherit' '
+	git branch --track=inherit foo2 my1 &&
+	test_cmp_config local branch.foo2.remote &&
+	test_cmp_config refs/heads/main branch.foo2.merge
+'
+
+test_expect_success 'tracking info copied with autoSetupMerge=inherit' '
+	test_unconfig branch.autoSetupMerge &&
+	# default config does not copy tracking info
+	git branch foo-no-inherit my1 &&
+	test_cmp_config "" --default "" branch.foo-no-inherit.remote &&
+	test_cmp_config "" --default "" branch.foo-no-inherit.merge &&
+	# with autoSetupMerge=inherit, we copy tracking info from my1
+	test_config branch.autoSetupMerge inherit &&
+	git branch foo3 my1 &&
+	test_cmp_config local branch.foo3.remote &&
+	test_cmp_config refs/heads/main branch.foo3.merge &&
+	# no tracking info to inherit from main
+	git branch main2 main &&
+	test_cmp_config "" --default "" branch.main2.remote &&
+	test_cmp_config "" --default "" branch.main2.merge
+'
+
+test_expect_success '--track overrides branch.autoSetupMerge' '
+	test_config branch.autoSetupMerge inherit &&
+	git branch --track=direct foo4 my1 &&
+	test_cmp_config . branch.foo4.remote &&
+	test_cmp_config refs/heads/my1 branch.foo4.merge &&
+	git branch --no-track foo5 my1 &&
+	test_cmp_config "" --default "" branch.foo5.remote &&
+	test_cmp_config "" --default "" branch.foo5.merge
+'
+
+test_expect_success 'errors if given a bad branch name' '
+	cat <<-\EOF >expect &&
+	fatal: '\''foo..bar'\'' is not a valid branch name
+	hint: See `man git check-ref-format`
+	hint: Disable this message with "git config advice.refSyntax false"
+	EOF
+	test_must_fail git branch foo..bar >actual 2>&1 &&
+	test_cmp expect actual
+'
+
 test_done
diff --git a/t/t3201-branch-contains.sh b/t/t3201-branch-contains.sh
index 40251c9..800fc33 100755
--- a/t/t3201-branch-contains.sh
+++ b/t/t3201-branch-contains.sh
@@ -10,51 +10,52 @@ test_expect_success setup '
 	git add file &&
 	test_tick &&
 	git commit -m initial &&
+	git branch -M main &&
 	git branch side &&
 
 	echo 1 >file &&
 	test_tick &&
-	git commit -a -m "second on master" &&
+	git commit -a -m "second on main" &&
 
 	git checkout side &&
 	echo 1 >file &&
 	test_tick &&
 	git commit -a -m "second on side" &&
 
-	git merge master
+	git merge main
 
 '
 
-test_expect_success 'branch --contains=master' '
+test_expect_success 'branch --contains=main' '
 
-	git branch --contains=master >actual &&
+	git branch --contains=main >actual &&
 	{
-		echo "  master" && echo "* side"
+		echo "  main" && echo "* side"
 	} >expect &&
 	test_cmp expect actual
 
 '
 
-test_expect_success 'branch --contains master' '
+test_expect_success 'branch --contains main' '
 
-	git branch --contains master >actual &&
+	git branch --contains main >actual &&
 	{
-		echo "  master" && echo "* side"
+		echo "  main" && echo "* side"
 	} >expect &&
 	test_cmp expect actual
 
 '
 
-test_expect_success 'branch --no-contains=master' '
+test_expect_success 'branch --no-contains=main' '
 
-	git branch --no-contains=master >actual &&
+	git branch --no-contains=main >actual &&
 	test_must_be_empty actual
 
 '
 
-test_expect_success 'branch --no-contains master' '
+test_expect_success 'branch --no-contains main' '
 
-	git branch --no-contains master >actual &&
+	git branch --no-contains main >actual &&
 	test_must_be_empty actual
 
 '
@@ -73,7 +74,7 @@ test_expect_success 'branch --no-contains=side' '
 
 	git branch --no-contains=side >actual &&
 	{
-		echo "  master"
+		echo "  main"
 	} >expect &&
 	test_cmp expect actual
 
@@ -81,9 +82,9 @@ test_expect_success 'branch --no-contains=side' '
 
 test_expect_success 'branch --contains with pattern implies --list' '
 
-	git branch --contains=master master >actual &&
+	git branch --contains=main main >actual &&
 	{
-		echo "  master"
+		echo "  main"
 	} >expect &&
 	test_cmp expect actual
 
@@ -91,7 +92,7 @@ test_expect_success 'branch --contains with pattern implies --list' '
 
 test_expect_success 'branch --no-contains with pattern implies --list' '
 
-	git branch --no-contains=master master >actual &&
+	git branch --no-contains=main main >actual &&
 	test_must_be_empty actual
 
 '
@@ -100,7 +101,7 @@ test_expect_success 'side: branch --merged' '
 
 	git branch --merged >actual &&
 	{
-		echo "  master" &&
+		echo "  main" &&
 		echo "* side"
 	} >expect &&
 	test_cmp expect actual
@@ -109,9 +110,9 @@ test_expect_success 'side: branch --merged' '
 
 test_expect_success 'branch --merged with pattern implies --list' '
 
-	git branch --merged=side master >actual &&
+	git branch --merged=side main >actual &&
 	{
-		echo "  master"
+		echo "  main"
 	} >expect &&
 	test_cmp expect actual
 
@@ -124,18 +125,18 @@ test_expect_success 'side: branch --no-merged' '
 
 '
 
-test_expect_success 'master: branch --merged' '
+test_expect_success 'main: branch --merged' '
 
-	git checkout master &&
+	git checkout main &&
 	git branch --merged >actual &&
 	{
-		echo "* master"
+		echo "* main"
 	} >expect &&
 	test_cmp expect actual
 
 '
 
-test_expect_success 'master: branch --no-merged' '
+test_expect_success 'main: branch --no-merged' '
 
 	git branch --no-merged >actual &&
 	{
@@ -147,22 +148,22 @@ test_expect_success 'master: branch --no-merged' '
 
 test_expect_success 'branch --no-merged with pattern implies --list' '
 
-	git branch --no-merged=master master >actual &&
+	git branch --no-merged=main main >actual &&
 	test_must_be_empty actual
 
 '
 
 test_expect_success 'implicit --list conflicts with modification options' '
 
-	test_must_fail git branch --contains=master -d &&
-	test_must_fail git branch --contains=master -m foo &&
-	test_must_fail git branch --no-contains=master -d &&
-	test_must_fail git branch --no-contains=master -m foo
+	test_must_fail git branch --contains=main -d &&
+	test_must_fail git branch --contains=main -m foo &&
+	test_must_fail git branch --no-contains=main -d &&
+	test_must_fail git branch --no-contains=main -m foo
 
 '
 
 test_expect_success 'Assert that --contains only works on commits, not trees & blobs' '
-	test_must_fail git branch --contains master^{tree} &&
+	test_must_fail git branch --contains main^{tree} &&
 	blob=$(git hash-object -w --stdin <<-\EOF
 	Some blob
 	EOF
@@ -171,44 +172,96 @@ test_expect_success 'Assert that --contains only works on commits, not trees & b
 	test_must_fail git branch --no-contains $blob
 '
 
+test_expect_success 'multiple branch --contains' '
+	git checkout -b side2 main &&
+	>feature &&
+	git add feature &&
+	git commit -m "add feature" &&
+	git checkout -b next main &&
+	git merge side &&
+	git branch --contains side --contains side2 >actual &&
+	cat >expect <<-\EOF &&
+	* next
+	  side
+	  side2
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'multiple branch --merged' '
+	git branch --merged next --merged main >actual &&
+	cat >expect <<-\EOF &&
+	  main
+	* next
+	  side
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'multiple branch --no-contains' '
+	git branch --no-contains side --no-contains side2 >actual &&
+	cat >expect <<-\EOF &&
+	  main
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'multiple branch --no-merged' '
+	git branch --no-merged next --no-merged main >actual &&
+	cat >expect <<-\EOF &&
+	  side2
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'branch --contains combined with --no-contains' '
+	git checkout -b seen main &&
+	git merge side &&
+	git merge side2 &&
+	git branch --contains side --no-contains side2 >actual &&
+	cat >expect <<-\EOF &&
+	  next
+	  side
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'branch --merged combined with --no-merged' '
+	git branch --merged seen --no-merged next >actual &&
+	cat >expect <<-\EOF &&
+	* seen
+	  side2
+	EOF
+	test_cmp expect actual
+'
+
 # We want to set up a case where the walk for the tracking info
 # of one branch crosses the tip of another branch (and make sure
 # that the latter walk does not mess up our flag to see if it was
 # merged).
 #
-# Here "topic" tracks "master" with one extra commit, and "zzz" points to the
-# same tip as master The name "zzz" must come alphabetically after "topic"
+# Here "topic" tracks "main" with one extra commit, and "zzz" points to the
+# same tip as main The name "zzz" must come alphabetically after "topic"
 # as we process them in that order.
 test_expect_success 'branch --merged with --verbose' '
-	git branch --track topic master &&
+	git branch --track topic main &&
 	git branch zzz topic &&
 	git checkout topic &&
 	test_commit foo &&
 	git branch --merged topic >actual &&
 	cat >expect <<-\EOF &&
-	  master
+	  main
 	* topic
 	  zzz
 	EOF
 	test_cmp expect actual &&
 	git branch --verbose --merged topic >actual &&
 	cat >expect <<-EOF &&
-	  master $(git rev-parse --short master) second on master
-	* topic  $(git rev-parse --short topic ) [ahead 1] foo
-	  zzz    $(git rev-parse --short zzz   ) second on master
-	EOF
-	test_i18ncmp expect actual
-'
-
-test_expect_success 'branch --contains combined with --no-contains' '
-	git branch --contains zzz --no-contains topic >actual &&
-	cat >expect <<-\EOF &&
-	  master
-	  side
-	  zzz
+	  main  $(git rev-parse --short main) second on main
+	* topic $(git rev-parse --short topic ) [ahead 1] foo
+	  zzz   $(git rev-parse --short zzz   ) second on main
 	EOF
 	test_cmp expect actual
-
 '
 
 test_done
diff --git a/t/t3202-show-branch-octopus.sh b/t/t3202-show-branch-octopus.sh
deleted file mode 100755
index 6adf478..0000000
--- a/t/t3202-show-branch-octopus.sh
+++ /dev/null
@@ -1,67 +0,0 @@
-#!/bin/sh
-
-test_description='test show-branch with more than 8 heads'
-
-. ./test-lib.sh
-
-numbers="1 2 3 4 5 6 7 8 9 10"
-
-test_expect_success 'setup' '
-
-	> file &&
-	git add file &&
-	test_tick &&
-	git commit -m initial &&
-
-	for i in $numbers
-	do
-		git checkout -b branch$i master &&
-		> file$i &&
-		git add file$i &&
-		test_tick &&
-		git commit -m branch$i || return 1
-	done
-
-'
-
-cat > expect << EOF
-! [branch1] branch1
- ! [branch2] branch2
-  ! [branch3] branch3
-   ! [branch4] branch4
-    ! [branch5] branch5
-     ! [branch6] branch6
-      ! [branch7] branch7
-       ! [branch8] branch8
-        ! [branch9] branch9
-         * [branch10] branch10
-----------
-         * [branch10] branch10
-        +  [branch9] branch9
-       +   [branch8] branch8
-      +    [branch7] branch7
-     +     [branch6] branch6
-    +      [branch5] branch5
-   +       [branch4] branch4
-  +        [branch3] branch3
- +         [branch2] branch2
-+          [branch1] branch1
-+++++++++* [branch10^] initial
-EOF
-
-test_expect_success 'show-branch with more than 8 branches' '
-
-	git show-branch $(for i in $numbers; do echo branch$i; done) > out &&
-	test_cmp expect out
-
-'
-
-test_expect_success 'show-branch with showbranch.default' '
-	for i in $numbers; do
-		git config --add showbranch.default branch$i
-	done &&
-	git show-branch >out &&
-	test_cmp expect out
-'
-
-test_done
diff --git a/t/t3202-show-branch.sh b/t/t3202-show-branch.sh
new file mode 100755
index 0000000..a1139f7
--- /dev/null
+++ b/t/t3202-show-branch.sh
@@ -0,0 +1,286 @@
+#!/bin/sh
+
+test_description='test show-branch'
+
+. ./test-lib.sh
+
+test_expect_success 'error descriptions on empty repository' '
+	current=$(git branch --show-current) &&
+	cat >expect <<-EOF &&
+	error: no commit on branch '\''$current'\'' yet
+	EOF
+	test_must_fail git branch --edit-description 2>actual &&
+	test_cmp expect actual &&
+	test_must_fail git branch --edit-description $current 2>actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'fatal descriptions on empty repository' '
+	current=$(git branch --show-current) &&
+	cat >expect <<-EOF &&
+	fatal: no commit on branch '\''$current'\'' yet
+	EOF
+	test_must_fail git branch --set-upstream-to=non-existent 2>actual &&
+	test_cmp expect actual &&
+	test_must_fail git branch -c new-branch 2>actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'setup' '
+	test_commit initial &&
+	for i in $(test_seq 1 10)
+	do
+		git checkout -b branch$i initial &&
+		test_commit --no-tag branch$i || return 1
+	done &&
+	git for-each-ref \
+		--sort=version:refname \
+		--format="%(refname:strip=2)" \
+		"refs/heads/branch*" >branches.sorted &&
+	sed "s/^> //" >expect <<-\EOF
+	> ! [branch1] branch1
+	>  ! [branch2] branch2
+	>   ! [branch3] branch3
+	>    ! [branch4] branch4
+	>     ! [branch5] branch5
+	>      ! [branch6] branch6
+	>       ! [branch7] branch7
+	>        ! [branch8] branch8
+	>         ! [branch9] branch9
+	>          * [branch10] branch10
+	> ----------
+	>          * [branch10] branch10
+	>         +  [branch9] branch9
+	>        +   [branch8] branch8
+	>       +    [branch7] branch7
+	>      +     [branch6] branch6
+	>     +      [branch5] branch5
+	>    +       [branch4] branch4
+	>   +        [branch3] branch3
+	>  +         [branch2] branch2
+	> +          [branch1] branch1
+	> +++++++++* [branch10^] initial
+	EOF
+'
+
+test_expect_success 'show-branch with more than 8 branches' '
+	git show-branch $(cat branches.sorted) >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'show-branch with showbranch.default' '
+	for branch in $(cat branches.sorted)
+	do
+		test_config showbranch.default $branch --add || return 1
+	done &&
+	git show-branch >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'show-branch --color output' '
+	sed "s/^> //" >expect <<-\EOF &&
+	> <RED>!<RESET> [branch1] branch1
+	>  <GREEN>!<RESET> [branch2] branch2
+	>   <YELLOW>!<RESET> [branch3] branch3
+	>    <BLUE>!<RESET> [branch4] branch4
+	>     <MAGENTA>!<RESET> [branch5] branch5
+	>      <CYAN>!<RESET> [branch6] branch6
+	>       <BOLD;RED>!<RESET> [branch7] branch7
+	>        <BOLD;GREEN>!<RESET> [branch8] branch8
+	>         <BOLD;YELLOW>!<RESET> [branch9] branch9
+	>          <BOLD;BLUE>*<RESET> [branch10] branch10
+	> ----------
+	>          <BOLD;BLUE>*<RESET> [branch10] branch10
+	>         <BOLD;YELLOW>+<RESET>  [branch9] branch9
+	>        <BOLD;GREEN>+<RESET>   [branch8] branch8
+	>       <BOLD;RED>+<RESET>    [branch7] branch7
+	>      <CYAN>+<RESET>     [branch6] branch6
+	>     <MAGENTA>+<RESET>      [branch5] branch5
+	>    <BLUE>+<RESET>       [branch4] branch4
+	>   <YELLOW>+<RESET>        [branch3] branch3
+	>  <GREEN>+<RESET>         [branch2] branch2
+	> <RED>+<RESET>          [branch1] branch1
+	> <RED>+<RESET><GREEN>+<RESET><YELLOW>+<RESET><BLUE>+<RESET><MAGENTA>+<RESET><CYAN>+<RESET><BOLD;RED>+<RESET><BOLD;GREEN>+<RESET><BOLD;YELLOW>+<RESET><BOLD;BLUE>*<RESET> [branch10^] initial
+	EOF
+	git show-branch --color=always $(cat branches.sorted) >actual.raw &&
+	test_decode_color <actual.raw >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'show branch --remotes' '
+	cat >expect.err <<-\EOF &&
+	No revs to be shown.
+	EOF
+	git show-branch -r 2>actual.err >actual.out &&
+	test_cmp expect.err actual.err &&
+	test_must_be_empty actual.out
+'
+
+test_expect_success 'show-branch --sparse' '
+	test_when_finished "git checkout branch10 && git branch -D branchA" &&
+	git checkout -b branchA branch10 &&
+	git merge -s ours -m "merge 1 and 10 to make A" branch1 &&
+	git commit --allow-empty -m "another" &&
+
+	git show-branch --sparse >out &&
+	grep "merge 1 and 10 to make A" out &&
+
+	git show-branch >out &&
+	! grep "merge 1 and 10 to make A" out &&
+
+	git show-branch --no-sparse >out &&
+	! grep "merge 1 and 10 to make A" out
+'
+
+test_expect_success 'setup show branch --list' '
+	sed "s/^> //" >expect <<-\EOF
+	>   [branch1] branch1
+	>   [branch2] branch2
+	>   [branch3] branch3
+	>   [branch4] branch4
+	>   [branch5] branch5
+	>   [branch6] branch6
+	>   [branch7] branch7
+	>   [branch8] branch8
+	>   [branch9] branch9
+	> * [branch10] branch10
+	EOF
+'
+
+test_expect_success 'show branch --list' '
+	git show-branch --list $(cat branches.sorted) >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'show branch --list has no --color output' '
+	git show-branch --color=always --list $(cat branches.sorted) >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'show branch --merge-base with one argument' '
+	for branch in $(cat branches.sorted)
+	do
+		git rev-parse $branch >expect &&
+		git show-branch --merge-base $branch >actual &&
+		test_cmp expect actual || return 1
+	done
+'
+
+test_expect_success 'show branch --merge-base with two arguments' '
+	for branch in $(cat branches.sorted)
+	do
+		git rev-parse initial >expect &&
+		git show-branch --merge-base initial $branch >actual &&
+		test_cmp expect actual || return 1
+	done
+'
+
+test_expect_success 'show branch --merge-base with N arguments' '
+	git rev-parse initial >expect &&
+	git show-branch --merge-base $(cat branches.sorted) >actual &&
+	test_cmp expect actual &&
+
+	git merge-base $(cat branches.sorted) >actual &&
+	test_cmp expect actual
+'
+
+# incompatible options
+while read combo
+do
+	test_expect_success "show-branch $combo (should fail)" '
+		test_must_fail git show-branch $combo 2>error &&
+		grep -e "cannot be used together" -e "usage:" error
+	'
+done <<\EOF
+--all --reflog
+--merge-base --reflog
+--list --merge-base
+--reflog --current
+EOF
+
+# unnegatable options
+for opt in topo-order date-order reflog
+do
+	test_expect_success "show-branch --no-$opt (should fail)" '
+		test_must_fail git show-branch --no-$opt 2>err &&
+		grep "unknown option .no-$opt." err
+	'
+done
+
+test_expect_success 'error descriptions on non-existent branch' '
+	cat >expect <<-EOF &&
+	error: no branch named '\''non-existent'\''
+	EOF
+	test_must_fail git branch --edit-description non-existent 2>actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'fatal descriptions on non-existent branch' '
+	cat >expect <<-EOF &&
+	fatal: branch '\''non-existent'\'' does not exist
+	EOF
+	test_must_fail git branch --set-upstream-to=non-existent non-existent 2>actual &&
+	test_cmp expect actual &&
+
+	cat >expect <<-EOF &&
+	fatal: no branch named '\''non-existent'\''
+	EOF
+	test_must_fail git branch -c non-existent new-branch 2>actual &&
+	test_cmp expect actual &&
+	test_must_fail git branch -m non-existent new-branch 2>actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'error descriptions on orphan branch' '
+	test_when_finished git worktree remove -f wt &&
+	git worktree add wt --detach &&
+	git -C wt checkout --orphan orphan-branch &&
+	test_branch_op_in_wt() {
+		test_orphan_error() {
+			test_must_fail git $* 2>actual &&
+			test_grep "no commit on branch .orphan-branch. yet$" actual
+		} &&
+		test_orphan_error -C wt branch $1 $2 &&                # implicit branch
+		test_orphan_error -C wt branch $1 orphan-branch $2 &&  # explicit branch
+		test_orphan_error branch $1 orphan-branch $2           # different worktree
+	} &&
+	test_branch_op_in_wt --edit-description &&
+	test_branch_op_in_wt --set-upstream-to=ne &&
+	test_branch_op_in_wt -c new-branch
+'
+
+test_expect_success 'setup reflogs' '
+	test_commit base &&
+	git checkout -b branch &&
+	test_commit one &&
+	git reset --hard HEAD^ &&
+	test_commit two &&
+	test_commit three
+'
+
+test_expect_success '--reflog shows reflog entries' '
+	cat >expect <<-\EOF &&
+	! [branch@{0}] (0 seconds ago) commit: three
+	 ! [branch@{1}] (60 seconds ago) commit: two
+	  ! [branch@{2}] (2 minutes ago) reset: moving to HEAD^
+	   ! [branch@{3}] (2 minutes ago) commit: one
+	----
+	+    [branch@{0}] three
+	++   [branch@{1}] two
+	   + [branch@{3}] one
+	++++ [branch@{2}] base
+	EOF
+	# the output always contains relative timestamps; use
+	# a known time to get deterministic results
+	GIT_TEST_DATE_NOW=$test_tick \
+	git show-branch --reflog branch >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success '--reflog handles missing reflog' '
+	git reflog expire --expire=now branch &&
+	git show-branch --reflog branch >actual &&
+	test_must_be_empty actual
+'
+
+test_done
diff --git a/t/t3203-branch-output.sh b/t/t3203-branch-output.sh
index 71818b9..758963b 100755
--- a/t/t3203-branch-output.sh
+++ b/t/t3203-branch-output.sh
@@ -8,6 +8,7 @@ test_expect_success 'make commits' '
 	echo content >file &&
 	git add file &&
 	git commit -m one &&
+	git branch -M main &&
 	echo content >>file &&
 	git commit -a -m two
 '
@@ -26,7 +27,7 @@ test_expect_success 'make remote branches' '
 cat >expect <<'EOF'
   branch-one
   branch-two
-* master
+* main
 EOF
 test_expect_success 'git branch shows local branches' '
 	git branch >actual &&
@@ -54,22 +55,38 @@ cat >expect <<'EOF'
 EOF
 test_expect_success 'git branch -r shows remote branches' '
 	git branch -r >actual &&
+	test_cmp expect actual &&
+
+	git branch --remotes >actual &&
 	test_cmp expect actual
 '
 
+test_expect_success 'git branch --no-remotes is rejected' '
+	test_must_fail git branch --no-remotes 2>err &&
+	grep "unknown option .no-remotes." err
+'
+
 cat >expect <<'EOF'
   branch-one
   branch-two
-* master
+* main
   remotes/origin/HEAD -> origin/branch-one
   remotes/origin/branch-one
   remotes/origin/branch-two
 EOF
 test_expect_success 'git branch -a shows local and remote branches' '
 	git branch -a >actual &&
+	test_cmp expect actual &&
+
+	git branch --all >actual &&
 	test_cmp expect actual
 '
 
+test_expect_success 'git branch --no-all is rejected' '
+	test_must_fail git branch --no-all 2>err &&
+	grep "unknown option .no-all." err
+'
+
 cat >expect <<'EOF'
 two
 one
@@ -152,24 +169,24 @@ test_expect_success 'git branch shows detached HEAD properly' '
 * (HEAD detached at $(git rev-parse --short HEAD^0))
   branch-one
   branch-two
-  master
+  main
 EOF
 	git checkout HEAD^0 &&
 	git branch >actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 test_expect_success 'git branch shows detached HEAD properly after checkout --detach' '
-	git checkout master &&
+	git checkout main &&
 	cat >expect <<EOF &&
 * (HEAD detached at $(git rev-parse --short HEAD^0))
   branch-one
   branch-two
-  master
+  main
 EOF
 	git checkout --detach &&
 	git branch >actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 test_expect_success 'git branch shows detached HEAD properly after moving' '
@@ -177,11 +194,11 @@ test_expect_success 'git branch shows detached HEAD properly after moving' '
 * (HEAD detached from $(git rev-parse --short HEAD))
   branch-one
   branch-two
-  master
+  main
 EOF
 	git reset --hard HEAD^1 &&
 	git branch >actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 test_expect_success 'git branch shows detached HEAD properly from tag' '
@@ -189,12 +206,12 @@ test_expect_success 'git branch shows detached HEAD properly from tag' '
 * (HEAD detached at fromtag)
   branch-one
   branch-two
-  master
+  main
 EOF
-	git tag fromtag master &&
+	git tag fromtag main &&
 	git checkout fromtag &&
 	git branch >actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 test_expect_success 'git branch shows detached HEAD properly after moving from tag' '
@@ -202,28 +219,77 @@ test_expect_success 'git branch shows detached HEAD properly after moving from t
 * (HEAD detached from fromtag)
   branch-one
   branch-two
-  master
+  main
 EOF
 	git reset --hard HEAD^1 &&
 	git branch >actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
-test_expect_success 'git branch `--sort` option' '
+test_expect_success 'git branch `--sort=[-]objectsize` option' '
 	cat >expect <<-\EOF &&
 	* (HEAD detached from fromtag)
 	  branch-two
 	  branch-one
-	  master
+	  main
 	EOF
 	git branch --sort=objectsize >actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual &&
+
+	cat >expect <<-\EOF &&
+	* (HEAD detached from fromtag)
+	  branch-one
+	  main
+	  branch-two
+	EOF
+	git branch --sort=-objectsize >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'git branch `--sort=[-]type` option' '
+	cat >expect <<-\EOF &&
+	* (HEAD detached from fromtag)
+	  branch-one
+	  branch-two
+	  main
+	EOF
+	git branch --sort=type >actual &&
+	test_cmp expect actual &&
+
+	cat >expect <<-\EOF &&
+	* (HEAD detached from fromtag)
+	  branch-one
+	  branch-two
+	  main
+	EOF
+	git branch --sort=-type >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'git branch `--sort=[-]version:refname` option' '
+	cat >expect <<-\EOF &&
+	* (HEAD detached from fromtag)
+	  branch-one
+	  branch-two
+	  main
+	EOF
+	git branch --sort=version:refname >actual &&
+	test_cmp expect actual &&
+
+	cat >expect <<-\EOF &&
+	* (HEAD detached from fromtag)
+	  main
+	  branch-two
+	  branch-one
+	EOF
+	git branch --sort=-version:refname >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success 'git branch --points-at option' '
 	cat >expect <<-\EOF &&
 	  branch-one
-	  master
+	  main
 	EOF
 	git branch --points-at=branch-one >actual &&
 	test_cmp expect actual
@@ -251,7 +317,7 @@ test_expect_success 'local-branch symrefs shortened properly' '
 
 test_expect_success 'sort branches, ignore case' '
 	(
-		git init sort-icase &&
+		git init -b main sort-icase &&
 		cd sort-icase &&
 		test_commit initial &&
 		git branch branch-one &&
@@ -260,14 +326,14 @@ test_expect_success 'sort branches, ignore case' '
 		cat >expected <<-\EOF &&
 		BRANCH-two
 		branch-one
-		master
+		main
 		EOF
 		test_cmp expected actual &&
 		git branch --list -i | awk "{print \$NF}" >actual &&
 		cat >expected <<-\EOF &&
 		branch-one
 		BRANCH-two
-		master
+		main
 		EOF
 		test_cmp expected actual
 	)
@@ -279,12 +345,54 @@ test_expect_success 'git branch --format option' '
 	Refname is refs/heads/ambiguous
 	Refname is refs/heads/branch-one
 	Refname is refs/heads/branch-two
-	Refname is refs/heads/master
+	Refname is refs/heads/main
 	Refname is refs/heads/ref-to-branch
 	Refname is refs/heads/ref-to-remote
 	EOF
 	git branch --format="Refname is %(refname)" >actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
+'
+
+test_expect_success 'git branch --format with ahead-behind' '
+	cat >expect <<-\EOF &&
+	(HEAD detached from fromtag) 0 0
+	refs/heads/ambiguous 0 0
+	refs/heads/branch-one 1 0
+	refs/heads/branch-two 0 0
+	refs/heads/main 1 0
+	refs/heads/ref-to-branch 1 0
+	refs/heads/ref-to-remote 1 0
+	EOF
+	git branch --format="%(refname) %(ahead-behind:HEAD)" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'git branch with --format=%(rest) must fail' '
+	test_must_fail git branch --format="%(rest)" >actual
+'
+
+test_expect_success 'git branch --format --omit-empty' '
+	cat >expect <<-\EOF &&
+	Refname is (HEAD detached from fromtag)
+	Refname is refs/heads/ambiguous
+	Refname is refs/heads/branch-one
+	Refname is refs/heads/branch-two
+
+	Refname is refs/heads/ref-to-branch
+	Refname is refs/heads/ref-to-remote
+	EOF
+	git branch --format="%(if:notequals=refs/heads/main)%(refname)%(then)Refname is %(refname)%(end)" >actual &&
+	test_cmp expect actual &&
+	cat >expect <<-\EOF &&
+	Refname is (HEAD detached from fromtag)
+	Refname is refs/heads/ambiguous
+	Refname is refs/heads/branch-one
+	Refname is refs/heads/branch-two
+	Refname is refs/heads/ref-to-branch
+	Refname is refs/heads/ref-to-remote
+	EOF
+	git branch --omit-empty --format="%(if:notequals=refs/heads/main)%(refname)%(then)Refname is %(refname)%(end)" >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success 'worktree colors correct' '
@@ -293,7 +401,7 @@ test_expect_success 'worktree colors correct' '
 	  ambiguous<RESET>
 	  branch-one<RESET>
 	+ <CYAN>branch-two<RESET>
-	  master<RESET>
+	  main<RESET>
 	  ref-to-branch<RESET> -> branch-one
 	  ref-to-remote<RESET> -> origin/branch-one
 	EOF
@@ -302,13 +410,13 @@ test_expect_success 'worktree colors correct' '
 	rm -r worktree_dir &&
 	git worktree prune &&
 	test_decode_color <actual.raw >actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 test_expect_success "set up color tests" '
-	echo "<RED>master<RESET>" >expect.color &&
-	echo "master" >expect.bare &&
-	color_args="--format=%(color:red)%(refname:short) --list master"
+	echo "<RED>main<RESET>" >expect.color &&
+	echo "main" >expect.bare &&
+	color_args="--format=%(color:red)%(refname:short) --list main"
 '
 
 test_expect_success '%(color) omitted without tty' '
@@ -331,13 +439,13 @@ test_expect_success '--color overrides auto-color' '
 
 test_expect_success 'verbose output lists worktree path' '
 	one=$(git rev-parse --short HEAD) &&
-	two=$(git rev-parse --short master) &&
+	two=$(git rev-parse --short main) &&
 	cat >expect <<-EOF &&
 	* (HEAD detached from fromtag) $one one
 	  ambiguous                    $one one
 	  branch-one                   $two two
 	+ branch-two                   $one ($(pwd)/worktree_dir) one
-	  master                       $two two
+	  main                         $two two
 	  ref-to-branch                $two two
 	  ref-to-remote                $two two
 	EOF
@@ -345,7 +453,7 @@ test_expect_success 'verbose output lists worktree path' '
 	git branch -vv >actual &&
 	rm -r worktree_dir &&
 	git worktree prune &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 test_done
diff --git a/t/t3204-branch-name-interpretation.sh b/t/t3204-branch-name-interpretation.sh
index 698d9cc..594e3e4 100755
--- a/t/t3204-branch-name-interpretation.sh
+++ b/t/t3204-branch-name-interpretation.sh
@@ -6,6 +6,10 @@ Branch name arguments are usually names which are taken to be inside of
 refs/heads/, but we interpret some magic syntax like @{-1}, @{upstream}, etc.
 This script aims to check the behavior of those corner cases.
 '
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 expect_branch() {
@@ -28,7 +32,7 @@ test_expect_success 'update branch via @{-1}' '
 	git branch previous one &&
 
 	git checkout previous &&
-	git checkout master &&
+	git checkout main &&
 
 	git branch -f @{-1} two &&
 	expect_branch previous two
@@ -54,11 +58,21 @@ test_expect_success 'create branch with pseudo-qualified name' '
 	expect_branch refs/heads/refs/heads/qualified two
 '
 
+test_expect_success 'force-copy a branch to itself via @{-1} is no-op' '
+	git branch -t copiable main &&
+	git checkout copiable &&
+	git checkout - &&
+	git branch -C @{-1} copiable &&
+	git config --get-all branch.copiable.merge >actual &&
+	echo refs/heads/main >expect &&
+	test_cmp expect actual
+'
+
 test_expect_success 'delete branch via @{-1}' '
 	git branch previous-del &&
 
 	git checkout previous-del &&
-	git checkout master &&
+	git checkout main &&
 
 	git branch -D @{-1} &&
 	expect_deleted previous-del
@@ -98,7 +112,7 @@ test_expect_success 'disallow deleting remote branch via @{-1}' '
 	git update-ref refs/remotes/origin/previous one &&
 
 	git checkout -b origin/previous two &&
-	git checkout master &&
+	git checkout main &&
 
 	test_must_fail git branch -r -D @{-1} &&
 	expect_branch refs/remotes/origin/previous one &&
@@ -130,4 +144,28 @@ test_expect_success 'checkout does not treat remote @{upstream} as a branch' '
 	expect_branch HEAD one
 '
 
+test_expect_success 'edit-description via @{-1}' '
+	git checkout -b desc-branch &&
+	git checkout -b non-desc-branch &&
+	write_script editor <<-\EOF &&
+		echo "Branch description" >"$1"
+	EOF
+	EDITOR=./editor git branch --edit-description @{-1} &&
+	test_must_fail git config branch.non-desc-branch.description &&
+	git config branch.desc-branch.description >actual &&
+	printf "Branch description\n\n" >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'modify branch upstream via "@{-1}" and "@{-1}@{upstream}"' '
+	git checkout -b upstream-branch &&
+	git checkout -b upstream-other -t upstream-branch &&
+	git branch --set-upstream-to upstream-other @{-1} &&
+	git config branch.upstream-branch.merge >actual &&
+	echo "refs/heads/upstream-other" >expect &&
+	test_cmp expect actual &&
+	git branch --unset-upstream @{-1}@{upstream} &&
+	test_must_fail git config branch.upstream-other.merge
+'
+
 test_done
diff --git a/t/t3205-branch-color.sh b/t/t3205-branch-color.sh
index 4f1e16b..0b61da9 100755
--- a/t/t3205-branch-color.sh
+++ b/t/t3205-branch-color.sh
@@ -1,11 +1,13 @@
 #!/bin/sh
 
 test_description='basic branch output coloring'
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'set up some sample branches' '
 	test_commit foo &&
-	git update-ref refs/remotes/origin/master HEAD &&
+	git branch -M main &&
+	git update-ref refs/remotes/origin/main HEAD &&
 	git update-ref refs/heads/other HEAD
 '
 
@@ -19,9 +21,9 @@ test_expect_success 'set up some color config' '
 
 test_expect_success 'regular output shows colors' '
 	cat >expect <<-\EOF &&
-	* <CYAN>master<RESET>
+	* <CYAN>main<RESET>
 	  <BLUE>other<RESET>
-	  <YELLOW>remotes/origin/master<RESET>
+	  <YELLOW>remotes/origin/main<RESET>
 	EOF
 	git branch --color -a >actual.raw &&
 	test_decode_color <actual.raw >actual &&
@@ -31,9 +33,9 @@ test_expect_success 'regular output shows colors' '
 test_expect_success 'verbose output shows colors' '
 	oid=$(git rev-parse --short HEAD) &&
 	cat >expect <<-EOF &&
-	* <CYAN>master               <RESET> $oid foo
-	  <BLUE>other                <RESET> $oid foo
-	  <YELLOW>remotes/origin/master<RESET> $oid foo
+	* <CYAN>main               <RESET> $oid foo
+	  <BLUE>other              <RESET> $oid foo
+	  <YELLOW>remotes/origin/main<RESET> $oid foo
 	EOF
 	git branch --color -v -a >actual.raw &&
 	test_decode_color <actual.raw >actual &&
diff --git a/t/t3206-range-diff.sh b/t/t3206-range-diff.sh
index e024cff..7b05bf3 100755
--- a/t/t3206-range-diff.sh
+++ b/t/t3206-range-diff.sh
@@ -2,6 +2,9 @@
 
 test_description='range-diff tests'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 # Note that because of the range-diff's heuristics, test_commit does more
@@ -30,6 +33,26 @@ test_expect_success 'setup' '
 	u3 sha256:736c4bc
 	u4 sha256:673e77d
 
+	# topic (abbrev=10)
+	t1_abbrev sha1:4de457d2c0
+	t2_abbrev sha1:fccce22f8c
+	t3_abbrev sha1:147e64ef53
+	t4_abbrev sha1:a63e992599
+	t1_abbrev sha256:b89f8b9092
+	t2_abbrev sha256:5f12aadf34
+	t3_abbrev sha256:ea8b273a6c
+	t4_abbrev sha256:14b73361fc
+
+	# unmodified (abbrev=10)
+	u1_abbrev sha1:35b9b25f76
+	u2_abbrev sha1:de345ab3de
+	u3_abbrev sha1:9af6654000
+	u4_abbrev sha1:2901f773f3
+	u1_abbrev sha256:e3731be242
+	u2_abbrev sha256:14fadf8cee
+	u3_abbrev sha256:736c4bcb44
+	u4_abbrev sha256:673e77d589
+
 	# reordered
 	r1 sha1:aca177a
 	r2 sha1:14ad629
@@ -127,7 +150,7 @@ test_expect_success 'setup' '
 '
 
 test_expect_success 'simple A..B A..C (unmodified)' '
-	git range-diff --no-color master..topic master..unmodified \
+	git range-diff --no-color main..topic main..unmodified \
 		>actual &&
 	cat >expect <<-EOF &&
 	1:  $(test_oid t1) = 1:  $(test_oid u1) s/5/A/
@@ -145,13 +168,38 @@ test_expect_success 'simple B...C (unmodified)' '
 '
 
 test_expect_success 'simple A B C (unmodified)' '
-	git range-diff --no-color master topic unmodified >actual &&
+	git range-diff --no-color main topic unmodified >actual &&
 	# same "expect" as above
 	test_cmp expect actual
 '
 
+test_expect_success 'simple A..B A..C (unmodified) with --abbrev' '
+	git range-diff --no-color --abbrev=10 main..topic main..unmodified \
+		>actual &&
+	cat >expect <<-EOF &&
+	1:  $(test_oid t1_abbrev) = 1:  $(test_oid u1_abbrev) s/5/A/
+	2:  $(test_oid t2_abbrev) = 2:  $(test_oid u2_abbrev) s/4/A/
+	3:  $(test_oid t3_abbrev) = 3:  $(test_oid u3_abbrev) s/11/B/
+	4:  $(test_oid t4_abbrev) = 4:  $(test_oid u4_abbrev) s/12/B/
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'A^! and A^-<n> (unmodified)' '
+	git range-diff --no-color topic^! unmodified^-1 >actual &&
+	cat >expect <<-EOF &&
+	1:  $(test_oid t4) = 1:  $(test_oid u4) s/12/B/
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'A^{/..} is not mistaken for a range' '
+	test_must_fail git range-diff topic^.. topic^{/..} -- 2>error &&
+	test_grep "not a commit range" error
+'
+
 test_expect_success 'trivial reordering' '
-	git range-diff --no-color master topic reordered >actual &&
+	git range-diff --no-color main topic reordered >actual &&
 	cat >expect <<-EOF &&
 	1:  $(test_oid t1) = 1:  $(test_oid r1) s/5/A/
 	3:  $(test_oid t3) = 2:  $(test_oid r2) s/11/B/
@@ -162,7 +210,7 @@ test_expect_success 'trivial reordering' '
 '
 
 test_expect_success 'removed a commit' '
-	git range-diff --no-color master topic removed >actual &&
+	git range-diff --no-color main topic removed >actual &&
 	cat >expect <<-EOF &&
 	1:  $(test_oid t1) = 1:  $(test_oid d1) s/5/A/
 	2:  $(test_oid t2) < -:  $(test_oid __) s/4/A/
@@ -173,7 +221,7 @@ test_expect_success 'removed a commit' '
 '
 
 test_expect_success 'added a commit' '
-	git range-diff --no-color master topic added >actual &&
+	git range-diff --no-color main topic added >actual &&
 	cat >expect <<-EOF &&
 	1:  $(test_oid t1) = 1:  $(test_oid a1) s/5/A/
 	2:  $(test_oid t2) = 2:  $(test_oid a2) s/4/A/
@@ -185,7 +233,7 @@ test_expect_success 'added a commit' '
 '
 
 test_expect_success 'new base, A B C' '
-	git range-diff --no-color master topic rebased >actual &&
+	git range-diff --no-color main topic rebased >actual &&
 	cat >expect <<-EOF &&
 	1:  $(test_oid t1) = 1:  $(test_oid b1) s/5/A/
 	2:  $(test_oid t2) = 2:  $(test_oid b2) s/4/A/
@@ -196,7 +244,7 @@ test_expect_success 'new base, A B C' '
 '
 
 test_expect_success 'new base, B...C' '
-	# this syntax includes the commits from master!
+	# this syntax includes the commits from main!
 	git range-diff --no-color topic...rebased >actual &&
 	cat >expect <<-EOF &&
 	-:  $(test_oid __) > 1:  $(test_oid b5) unrelated
@@ -252,17 +300,13 @@ test_expect_success 'changed commit with --stat diff option' '
 	git range-diff --no-color --stat topic...changed >actual &&
 	cat >expect <<-EOF &&
 	1:  $(test_oid t1) = 1:  $(test_oid c1) s/5/A/
-	     a => b | 0
-	     1 file changed, 0 insertions(+), 0 deletions(-)
 	2:  $(test_oid t2) = 2:  $(test_oid c2) s/4/A/
-	     a => b | 0
-	     1 file changed, 0 insertions(+), 0 deletions(-)
 	3:  $(test_oid t3) ! 3:  $(test_oid c3) s/11/B/
-	     a => b | 0
-	     1 file changed, 0 insertions(+), 0 deletions(-)
+	     a => b | 2 +-
+	     1 file changed, 1 insertion(+), 1 deletion(-)
 	4:  $(test_oid t4) ! 4:  $(test_oid c4) s/12/B/
-	     a => b | 0
-	     1 file changed, 0 insertions(+), 0 deletions(-)
+	     a => b | 2 +-
+	     1 file changed, 1 insertion(+), 1 deletion(-)
 	EOF
 	test_cmp expect actual
 '
@@ -424,7 +468,7 @@ test_expect_success 'file added and later removed' '
 
 test_expect_success 'no commits on one side' '
 	git commit --amend -m "new message" &&
-	git range-diff master HEAD@{1} HEAD
+	git range-diff main HEAD@{1} HEAD
 '
 
 test_expect_success 'changed message' '
@@ -486,14 +530,14 @@ test_expect_success 'dual-coloring' '
 	test_cmp expect actual
 '
 
-for prev in topic master..topic
+for prev in topic main..topic
 do
 	test_expect_success "format-patch --range-diff=$prev" '
 		git format-patch --cover-letter --range-diff=$prev \
-			master..unmodified >actual &&
+			main..unmodified >actual &&
 		test_when_finished "rm 000?-*" &&
 		test_line_count = 5 actual &&
-		test_i18ngrep "^Range-diff:$" 0000-* &&
+		test_grep "^Range-diff:$" 0000-* &&
 		grep "= 1: .* s/5/A" 0000-* &&
 		grep "= 2: .* s/4/A" 0000-* &&
 		grep "= 3: .* s/11/B" 0000-* &&
@@ -505,29 +549,53 @@ test_expect_success 'format-patch --range-diff as commentary' '
 	git format-patch --range-diff=HEAD~1 HEAD~1 >actual &&
 	test_when_finished "rm 0001-*" &&
 	test_line_count = 1 actual &&
-	test_i18ngrep "^Range-diff:$" 0001-* &&
+	test_grep "^Range-diff:$" 0001-* &&
 	grep "> 1: .* new message" 0001-*
 '
 
+test_expect_success 'format-patch --range-diff reroll-count with a non-integer' '
+	git format-patch --range-diff=HEAD~1 -v2.9 HEAD~1 >actual &&
+	test_when_finished "rm v2.9-0001-*" &&
+	test_line_count = 1 actual &&
+	test_grep "^Range-diff:$" v2.9-0001-* &&
+	grep "> 1: .* new message" v2.9-0001-*
+'
+
+test_expect_success 'format-patch --range-diff reroll-count with a integer' '
+	git format-patch --range-diff=HEAD~1 -v2 HEAD~1 >actual &&
+	test_when_finished "rm v2-0001-*" &&
+	test_line_count = 1 actual &&
+	test_grep "^Range-diff ..* v1:$" v2-0001-* &&
+	grep "> 1: .* new message" v2-0001-*
+'
+
+test_expect_success 'format-patch --range-diff with v0' '
+	git format-patch --range-diff=HEAD~1 -v0 HEAD~1 >actual &&
+	test_when_finished "rm v0-0001-*" &&
+	test_line_count = 1 actual &&
+	test_grep "^Range-diff:$" v0-0001-* &&
+	grep "> 1: .* new message" v0-0001-*
+'
+
 test_expect_success 'range-diff overrides diff.noprefix internally' '
 	git -c diff.noprefix=true range-diff HEAD^...
 '
 
 test_expect_success 'basic with modified format.pretty with suffix' '
 	git -c format.pretty="format:commit %H%d%n" range-diff \
-		master..topic master..unmodified
+		main..topic main..unmodified
 '
 
 test_expect_success 'basic with modified format.pretty without "commit "' '
 	git -c format.pretty="format:%H%n" range-diff \
-		master..topic master..unmodified
+		main..topic main..unmodified
 '
 
 test_expect_success 'range-diff compares notes by default' '
 	git notes add -m "topic note" topic &&
 	git notes add -m "unmodified note" unmodified &&
 	test_when_finished git notes remove topic unmodified &&
-	git range-diff --no-color master..topic master..unmodified \
+	git range-diff --no-color main..topic main..unmodified \
 		>actual &&
 	sed s/Z/\ /g >expect <<-EOF &&
 	1:  $(test_oid t1) = 1:  $(test_oid u1) s/5/A/
@@ -551,7 +619,7 @@ test_expect_success 'range-diff with --no-notes' '
 	git notes add -m "topic note" topic &&
 	git notes add -m "unmodified note" unmodified &&
 	test_when_finished git notes remove topic unmodified &&
-	git range-diff --no-color --no-notes master..topic master..unmodified \
+	git range-diff --no-color --no-notes main..topic main..unmodified \
 		>actual &&
 	cat >expect <<-EOF &&
 	1:  $(test_oid t1) = 1:  $(test_oid u1) s/5/A/
@@ -569,7 +637,7 @@ test_expect_success 'range-diff with multiple --notes' '
 	git notes --ref=note2 add -m "topic note2" topic &&
 	git notes --ref=note2 add -m "unmodified note2" unmodified &&
 	test_when_finished git notes --ref=note2 remove topic unmodified &&
-	git range-diff --no-color --notes=note1 --notes=note2 master..topic master..unmodified \
+	git range-diff --no-color --notes=note1 --notes=note2 main..topic main..unmodified \
 		>actual &&
 	sed s/Z/\ /g >expect <<-EOF &&
 	1:  $(test_oid t1) = 1:  $(test_oid u1) s/5/A/
@@ -594,15 +662,29 @@ test_expect_success 'range-diff with multiple --notes' '
 	test_cmp expect actual
 '
 
+# `range-diff` should act like `log` with regards to notes
+test_expect_success 'range-diff with --notes=custom does not show default notes' '
+	git notes add -m "topic note" topic &&
+	git notes add -m "unmodified note" unmodified &&
+	git notes --ref=custom add -m "topic note" topic &&
+	git notes --ref=custom add -m "unmodified note" unmodified &&
+	test_when_finished git notes remove topic unmodified &&
+	test_when_finished git notes --ref=custom remove topic unmodified &&
+	git range-diff --notes=custom main..topic main..unmodified \
+		>actual &&
+	! grep "## Notes ##" actual &&
+	grep "## Notes (custom) ##" actual
+'
+
 test_expect_success 'format-patch --range-diff does not compare notes by default' '
 	git notes add -m "topic note" topic &&
 	git notes add -m "unmodified note" unmodified &&
 	test_when_finished git notes remove topic unmodified &&
 	git format-patch --cover-letter --range-diff=$prev \
-		master..unmodified >actual &&
+		main..unmodified >actual &&
 	test_when_finished "rm 000?-*" &&
 	test_line_count = 5 actual &&
-	test_i18ngrep "^Range-diff:$" 0000-* &&
+	test_grep "^Range-diff:$" 0000-* &&
 	grep "= 1: .* s/5/A" 0000-* &&
 	grep "= 2: .* s/4/A" 0000-* &&
 	grep "= 3: .* s/11/B" 0000-* &&
@@ -611,15 +693,29 @@ test_expect_success 'format-patch --range-diff does not compare notes by default
 	! grep "note" 0000-*
 '
 
+test_expect_success 'format-patch --notes=custom --range-diff only compares custom notes' '
+	git notes add -m "topic note" topic &&
+	git notes --ref=custom add -m "topic note (custom)" topic &&
+	git notes add -m "unmodified note" unmodified &&
+	git notes --ref=custom add -m "unmodified note (custom)" unmodified &&
+	test_when_finished git notes remove topic unmodified &&
+	test_when_finished git notes --ref=custom remove topic unmodified &&
+	git format-patch --notes=custom --cover-letter --range-diff=$prev \
+		main..unmodified >actual &&
+	test_when_finished "rm 000?-*" &&
+	grep "## Notes (custom) ##" 0000-* &&
+	! grep "## Notes ##" 0000-*
+'
+
 test_expect_success 'format-patch --range-diff with --no-notes' '
 	git notes add -m "topic note" topic &&
 	git notes add -m "unmodified note" unmodified &&
 	test_when_finished git notes remove topic unmodified &&
 	git format-patch --no-notes --cover-letter --range-diff=$prev \
-		master..unmodified >actual &&
+		main..unmodified >actual &&
 	test_when_finished "rm 000?-*" &&
 	test_line_count = 5 actual &&
-	test_i18ngrep "^Range-diff:$" 0000-* &&
+	test_grep "^Range-diff:$" 0000-* &&
 	grep "= 1: .* s/5/A" 0000-* &&
 	grep "= 2: .* s/4/A" 0000-* &&
 	grep "= 3: .* s/11/B" 0000-* &&
@@ -633,10 +729,10 @@ test_expect_success 'format-patch --range-diff with --notes' '
 	git notes add -m "unmodified note" unmodified &&
 	test_when_finished git notes remove topic unmodified &&
 	git format-patch --notes --cover-letter --range-diff=$prev \
-		master..unmodified >actual &&
+		main..unmodified >actual &&
 	test_when_finished "rm 000?-*" &&
 	test_line_count = 5 actual &&
-	test_i18ngrep "^Range-diff:$" 0000-* &&
+	test_grep "^Range-diff:$" 0000-* &&
 	grep "= 1: .* s/5/A" 0000-* &&
 	grep "= 2: .* s/4/A" 0000-* &&
 	grep "= 3: .* s/11/B" 0000-* &&
@@ -662,10 +758,10 @@ test_expect_success 'format-patch --range-diff with format.notes config' '
 	test_when_finished git notes remove topic unmodified &&
 	test_config format.notes true &&
 	git format-patch --cover-letter --range-diff=$prev \
-		master..unmodified >actual &&
+		main..unmodified >actual &&
 	test_when_finished "rm 000?-*" &&
 	test_line_count = 5 actual &&
-	test_i18ngrep "^Range-diff:$" 0000-* &&
+	test_grep "^Range-diff:$" 0000-* &&
 	grep "= 1: .* s/5/A" 0000-* &&
 	grep "= 2: .* s/4/A" 0000-* &&
 	grep "= 3: .* s/11/B" 0000-* &&
@@ -693,10 +789,10 @@ test_expect_success 'format-patch --range-diff with multiple notes' '
 	git notes --ref=note2 add -m "unmodified note2" unmodified &&
 	test_when_finished git notes --ref=note2 remove topic unmodified &&
 	git format-patch --notes=note1 --notes=note2 --cover-letter --range-diff=$prev \
-		master..unmodified >actual &&
+		main..unmodified >actual &&
 	test_when_finished "rm 000?-*" &&
 	test_line_count = 5 actual &&
-	test_i18ngrep "^Range-diff:$" 0000-* &&
+	test_grep "^Range-diff:$" 0000-* &&
 	grep "= 1: .* s/5/A" 0000-* &&
 	grep "= 2: .* s/4/A" 0000-* &&
 	grep "= 3: .* s/11/B" 0000-* &&
@@ -721,4 +817,81 @@ test_expect_success 'format-patch --range-diff with multiple notes' '
 	test_cmp expect actual
 '
 
+test_expect_success '--left-only/--right-only' '
+	git switch --orphan left-right &&
+	test_commit first &&
+	test_commit unmatched &&
+	test_commit common &&
+	git switch -C left-right first &&
+	git cherry-pick common &&
+
+	git range-diff -s --left-only ...common >actual &&
+	head_oid=$(git rev-parse --short HEAD) &&
+	common_oid=$(git rev-parse --short common) &&
+	echo "1:  $head_oid = 2:  $common_oid common" >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'ranges with pathspecs' '
+	git range-diff topic...mode-only-change -- other-file >actual &&
+	test_line_count = 2 actual &&
+	topic_oid=$(git rev-parse --short topic) &&
+	mode_change_oid=$(git rev-parse --short mode-only-change^) &&
+	file_change_oid=$(git rev-parse --short mode-only-change) &&
+	grep "$mode_change_oid" actual &&
+	! grep "$file_change_oid" actual &&
+	! grep "$topic_oid" actual
+'
+
+test_expect_success 'submodule changes are shown irrespective of diff.submodule' '
+	git init sub-repo &&
+	test_commit -C sub-repo sub-first &&
+	sub_oid1=$(git -C sub-repo rev-parse HEAD) &&
+	test_commit -C sub-repo sub-second &&
+	sub_oid2=$(git -C sub-repo rev-parse HEAD) &&
+	test_commit -C sub-repo sub-third &&
+	sub_oid3=$(git -C sub-repo rev-parse HEAD) &&
+
+	git checkout -b main-sub topic &&
+	git -c protocol.file.allow=always submodule add ./sub-repo sub &&
+	git -C sub checkout --detach sub-first &&
+	git commit -m "add sub" sub &&
+	sup_oid1=$(git rev-parse --short HEAD) &&
+	git checkout -b topic-sub &&
+	git -C sub checkout sub-second &&
+	git commit -m "change sub" sub &&
+	sup_oid2=$(git rev-parse --short HEAD) &&
+	git checkout -b modified-sub main-sub &&
+	git -C sub checkout sub-third &&
+	git commit -m "change sub" sub &&
+	sup_oid3=$(git rev-parse --short HEAD) &&
+	sup_oid0=$(test_oid __) &&
+
+	test_config diff.submodule log &&
+	git range-diff topic topic-sub modified-sub >actual &&
+	cat >expect <<-EOF &&
+	1:  $sup_oid1 = 1:  $sup_oid1 add sub
+	2:  $sup_oid2 < -:  $sup_oid0 change sub
+	-:  $sup_oid0 > 2:  $sup_oid3 change sub
+	EOF
+	test_cmp expect actual &&
+	test_config diff.submodule diff &&
+	git range-diff topic topic-sub modified-sub >actual &&
+	git range-diff --creation-factor=100 topic topic-sub modified-sub >actual &&
+	cat >expect <<-EOF &&
+	1:  $sup_oid1 = 1:  $sup_oid1 add sub
+	2:  $sup_oid2 ! 2:  $sup_oid3 change sub
+	    @@ Commit message
+	      ## sub ##
+	     @@
+	     -Subproject commit $sub_oid1
+	    -+Subproject commit $sub_oid2
+	    ++Subproject commit $sub_oid3
+	EOF
+	test_cmp expect actual &&
+	test_config diff.submodule diff &&
+	git range-diff --creation-factor=100 topic topic-sub modified-sub >actual &&
+	test_cmp expect actual
+'
+
 test_done
diff --git a/t/t3206/history.export b/t/t3206/history.export
index 4c808e5..4485adc 100644
--- a/t/t3206/history.export
+++ b/t/t3206/history.export
@@ -168,7 +168,7 @@ mark :11
 data 10
 unrelated
 
-commit refs/heads/master
+commit refs/heads/main
 mark :12
 author Thomas Rast <trast@inf.ethz.ch> 1374485127 +0200
 committer Thomas Rast <trast@inf.ethz.ch> 1374485127 +0200
diff --git a/t/t3207-branch-submodule.sh b/t/t3207-branch-submodule.sh
new file mode 100755
index 0000000..fe72b24
--- /dev/null
+++ b/t/t3207-branch-submodule.sh
@@ -0,0 +1,329 @@
+#!/bin/sh
+
+test_description='git branch submodule tests'
+
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+. ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-rebase.sh
+
+pwd=$(pwd)
+
+# Creates a clean test environment in "pwd" by copying the repo setup
+# from test_dirs.
+reset_test () {
+	rm -fr super &&
+	rm -fr sub-sub-upstream &&
+	rm -fr sub-upstream &&
+	cp -r test_dirs/* .
+}
+
+# Tests that the expected branch does not exist
+test_no_branch () {
+	DIR=$1 &&
+	BRANCH_NAME=$2 &&
+	test_must_fail git -C "$DIR" rev-parse "$BRANCH_NAME" 2>err &&
+	grep "ambiguous argument .$BRANCH_NAME." err
+}
+
+test_expect_success 'setup superproject and submodule' '
+	git config --global protocol.file.allow always &&
+	mkdir test_dirs &&
+	(
+		cd test_dirs &&
+		git init super &&
+		test_commit -C super foo &&
+		git init sub-sub-upstream &&
+		test_commit -C sub-sub-upstream foo &&
+		git init sub-upstream &&
+		# Submodule in a submodule
+		git -C sub-upstream submodule add "${pwd}/test_dirs/sub-sub-upstream" sub-sub &&
+		git -C sub-upstream commit -m "add submodule" &&
+		# Regular submodule
+		git -C super submodule add "${pwd}/test_dirs/sub-upstream" sub &&
+		# Submodule in a subdirectory
+		git -C super submodule add "${pwd}/test_dirs/sub-sub-upstream" second/sub &&
+		git -C super commit -m "add submodule" &&
+		git -C super config submodule.propagateBranches true &&
+		git -C super/sub submodule update --init
+	) &&
+	reset_test
+'
+
+# Test the argument parsing
+test_expect_success '--recurse-submodules should create branches' '
+	test_when_finished "reset_test" &&
+	(
+		cd super &&
+		git branch --recurse-submodules branch-a &&
+		git rev-parse branch-a &&
+		git -C sub rev-parse branch-a &&
+		git -C sub/sub-sub rev-parse branch-a &&
+		git -C second/sub rev-parse branch-a
+	)
+'
+
+test_expect_success '--recurse-submodules should die if submodule.propagateBranches is false' '
+	test_when_finished "reset_test" &&
+	(
+		cd super &&
+		echo "fatal: branch with --recurse-submodules can only be used if submodule.propagateBranches is enabled" >expected &&
+		test_must_fail git -c submodule.propagateBranches=false branch --recurse-submodules branch-a 2>actual &&
+		test_cmp expected actual
+	)
+'
+
+test_expect_success '--recurse-submodules should fail when not creating branches' '
+	test_when_finished "reset_test" &&
+	(
+		cd super &&
+		git branch --recurse-submodules branch-a &&
+		echo "fatal: --recurse-submodules can only be used to create branches" >expected &&
+		test_must_fail git branch --recurse-submodules -D branch-a 2>actual &&
+		test_cmp expected actual &&
+		# Assert that the branches were not deleted
+		git rev-parse branch-a &&
+		git -C sub rev-parse branch-a
+	)
+'
+
+test_expect_success 'should respect submodule.recurse when creating branches' '
+	test_when_finished "reset_test" &&
+	(
+		cd super &&
+		git -c submodule.recurse=true branch branch-a &&
+		git rev-parse branch-a &&
+		git -C sub rev-parse branch-a
+	)
+'
+
+test_expect_success 'should ignore submodule.recurse when not creating branches' '
+	test_when_finished "reset_test" &&
+	(
+		cd super &&
+		git branch --recurse-submodules branch-a &&
+		git -c submodule.recurse=true branch -D branch-a &&
+		test_no_branch . branch-a &&
+		git -C sub rev-parse branch-a
+	)
+'
+
+# Test branch creation behavior
+test_expect_success 'should create branches based off commit id in superproject' '
+	test_when_finished "reset_test" &&
+	(
+		cd super &&
+		git branch --recurse-submodules branch-a &&
+		git checkout --recurse-submodules branch-a &&
+		git -C sub rev-parse HEAD >expected &&
+		# Move the tip of sub:branch-a so that it no longer matches the commit in super:branch-a
+		git -C sub checkout branch-a &&
+		test_commit -C sub bar &&
+		# Create a new branch-b branch with start-point=branch-a
+		git branch --recurse-submodules branch-b branch-a &&
+		git rev-parse branch-b &&
+		git -C sub rev-parse branch-b >actual &&
+		# Assert that the commit id of sub:second-branch matches super:branch-a and not sub:branch-a
+		test_cmp expected actual
+	)
+'
+
+test_expect_success 'should not create any branches if branch is not valid for all repos' '
+	test_when_finished "reset_test" &&
+	(
+		cd super &&
+		git -C sub branch branch-a &&
+		test_must_fail git branch --recurse-submodules branch-a 2>actual &&
+		test_no_branch . branch-a &&
+		grep "submodule .sub.: fatal: a branch named .branch-a. already exists" actual
+	)
+'
+
+test_expect_success 'should create branches if branch exists and --force is given' '
+	test_when_finished "reset_test" &&
+	(
+		cd super &&
+		git -C sub rev-parse HEAD >expected &&
+		test_commit -C sub baz &&
+		# branch-a in sub now points to a newer commit.
+		git -C sub branch branch-a HEAD &&
+		git -C sub rev-parse branch-a >actual-old-branch-a &&
+		git branch --recurse-submodules --force branch-a &&
+		git rev-parse branch-a &&
+		git -C sub rev-parse branch-a >actual-new-branch-a &&
+		test_cmp expected actual-new-branch-a &&
+		# assert that branch --force actually moved the sub
+		# branch
+		! test_cmp expected actual-old-branch-a
+	)
+'
+
+test_expect_success 'should create branch when submodule is not in HEAD:.gitmodules' '
+	test_when_finished "reset_test" &&
+	(
+		cd super &&
+		git branch branch-a &&
+		git checkout -b branch-b &&
+		git submodule add ../sub-upstream sub2 &&
+		git -C sub2 submodule update --init &&
+		# branch-b now has a committed submodule not in branch-a
+		git commit -m "add second submodule" &&
+		git checkout branch-a &&
+		git branch --recurse-submodules branch-c branch-b &&
+		git checkout --recurse-submodules branch-c &&
+		git -C sub2 rev-parse branch-c &&
+		git -C sub2/sub-sub rev-parse branch-c
+	)
+'
+
+test_expect_success 'should not create branches in inactive submodules' '
+	test_when_finished "reset_test" &&
+	test_config -C super submodule.sub.active false &&
+	(
+		cd super &&
+		git branch --recurse-submodules branch-a &&
+		git rev-parse branch-a &&
+		test_no_branch sub branch-a
+	)
+'
+
+test_expect_success 'should set up tracking of local branches with track=always' '
+	test_when_finished "reset_test" &&
+	(
+		cd super &&
+		git -c branch.autoSetupMerge=always branch --recurse-submodules branch-a main &&
+		git -C sub rev-parse main &&
+		test_cmp_config -C sub . branch.branch-a.remote &&
+		test_cmp_config -C sub refs/heads/main branch.branch-a.merge
+	)
+'
+
+test_expect_success 'should set up tracking of local branches with explicit track' '
+	test_when_finished "reset_test" &&
+	(
+		cd super &&
+		git branch --track --recurse-submodules branch-a main &&
+		git -C sub rev-parse main &&
+		test_cmp_config -C sub . branch.branch-a.remote &&
+		test_cmp_config -C sub refs/heads/main branch.branch-a.merge
+	)
+'
+
+test_expect_success 'should not set up unnecessary tracking of local branches' '
+	test_when_finished "reset_test" &&
+	(
+		cd super &&
+		git branch --recurse-submodules branch-a main &&
+		git -C sub rev-parse main &&
+		test_cmp_config -C sub "" --default "" branch.branch-a.remote &&
+		test_cmp_config -C sub "" --default "" branch.branch-a.merge
+	)
+'
+
+reset_remote_test () {
+	rm -fr super-clone &&
+	reset_test
+}
+
+test_expect_success 'setup tests with remotes' '
+	(
+		cd test_dirs &&
+		(
+			cd super &&
+			git branch branch-a &&
+			git checkout -b branch-b &&
+			git submodule add ../sub-upstream sub2 &&
+			# branch-b now has a committed submodule not in branch-a
+			git commit -m "add second submodule"
+		) &&
+		git clone --branch main --recurse-submodules super super-clone &&
+		git -C super-clone config submodule.propagateBranches true
+	) &&
+	reset_remote_test
+'
+
+test_expect_success 'should get fatal error upon branch creation when submodule is not in .git/modules' '
+	test_when_finished "reset_remote_test" &&
+	(
+		cd super-clone &&
+		# This should succeed because super-clone has sub in .git/modules
+		git branch --recurse-submodules branch-a origin/branch-a &&
+		# This should fail because super-clone does not have sub2 .git/modules
+		test_must_fail git branch --recurse-submodules branch-b origin/branch-b 2>actual &&
+		grep "fatal: submodule .sub2.: unable to find submodule" actual &&
+		test_no_branch . branch-b &&
+		test_no_branch sub branch-b &&
+		# User can fix themselves by initializing the submodule
+		git checkout origin/branch-b &&
+		git submodule update --init --recursive &&
+		git branch --recurse-submodules branch-b origin/branch-b
+	)
+'
+
+test_expect_success 'should set up tracking of remote-tracking branches by default' '
+	test_when_finished "reset_remote_test" &&
+	(
+		cd super-clone &&
+		git branch --recurse-submodules branch-a origin/branch-a &&
+		test_cmp_config origin branch.branch-a.remote &&
+		test_cmp_config refs/heads/branch-a branch.branch-a.merge &&
+		# "origin/branch-a" does not exist for "sub", but it matches the refspec
+		# so tracking should be set up
+		test_cmp_config -C sub origin branch.branch-a.remote &&
+		test_cmp_config -C sub refs/heads/branch-a branch.branch-a.merge &&
+		test_cmp_config -C sub/sub-sub origin branch.branch-a.remote &&
+		test_cmp_config -C sub/sub-sub refs/heads/branch-a branch.branch-a.merge
+	)
+'
+
+test_expect_success 'should not fail when unable to set up tracking in submodule' '
+	test_when_finished "reset_remote_test" &&
+	(
+		cd super-clone &&
+		git remote rename origin ex-origin &&
+		git branch --recurse-submodules branch-a ex-origin/branch-a &&
+		test_cmp_config ex-origin branch.branch-a.remote &&
+		test_cmp_config refs/heads/branch-a branch.branch-a.merge &&
+		test_cmp_config -C sub "" --default "" branch.branch-a.remote &&
+		test_cmp_config -C sub "" --default "" branch.branch-a.merge
+	)
+'
+
+test_expect_success '--track=inherit should set up tracking correctly' '
+	test_when_finished "reset_remote_test" &&
+	(
+		cd super-clone &&
+		git branch --recurse-submodules branch-a origin/branch-a &&
+		# Set this manually instead of using branch --set-upstream-to
+		# to circumvent the "nonexistent upstream" check.
+		git -C sub config branch.branch-a.remote origin &&
+		git -C sub config branch.branch-a.merge refs/heads/sub-branch-a &&
+		git -C sub/sub-sub config branch.branch-a.remote other &&
+		git -C sub/sub-sub config branch.branch-a.merge refs/heads/sub-sub-branch-a &&
+
+		git branch --recurse-submodules --track=inherit branch-b branch-a &&
+		test_cmp_config origin branch.branch-b.remote &&
+		test_cmp_config refs/heads/branch-a branch.branch-b.merge &&
+		test_cmp_config -C sub origin branch.branch-b.remote &&
+		test_cmp_config -C sub refs/heads/sub-branch-a branch.branch-b.merge &&
+		test_cmp_config -C sub/sub-sub other branch.branch-b.remote &&
+		test_cmp_config -C sub/sub-sub refs/heads/sub-sub-branch-a branch.branch-b.merge
+	)
+'
+
+test_expect_success '--no-track should not set up tracking' '
+	test_when_finished "reset_remote_test" &&
+	(
+		cd super-clone &&
+		git branch --recurse-submodules --no-track branch-a origin/branch-a &&
+		test_cmp_config "" --default "" branch.branch-a.remote &&
+		test_cmp_config "" --default "" branch.branch-a.merge &&
+		test_cmp_config -C sub "" --default "" branch.branch-a.remote &&
+		test_cmp_config -C sub "" --default "" branch.branch-a.merge &&
+		test_cmp_config -C sub/sub-sub "" --default "" branch.branch-a.remote &&
+		test_cmp_config -C sub/sub-sub "" --default "" branch.branch-a.merge
+	)
+'
+
+test_done
diff --git a/t/t3210-pack-refs.sh b/t/t3210-pack-refs.sh
deleted file mode 100755
index f41b2af..0000000
--- a/t/t3210-pack-refs.sh
+++ /dev/null
@@ -1,256 +0,0 @@
-#!/bin/sh
-#
-# Copyright (c) 2005 Amos Waterland
-# Copyright (c) 2006 Christian Couder
-#
-
-test_description='git pack-refs should not change the branch semantic
-
-This test runs git pack-refs and git show-ref and checks that the branch
-semantic is still the same.
-'
-. ./test-lib.sh
-
-test_expect_success 'enable reflogs' '
-	git config core.logallrefupdates true
-'
-
-test_expect_success \
-    'prepare a trivial repository' \
-    'echo Hello > A &&
-     git update-index --add A &&
-     git commit -m "Initial commit." &&
-     HEAD=$(git rev-parse --verify HEAD)'
-
-SHA1=
-
-test_expect_success \
-    'see if git show-ref works as expected' \
-    'git branch a &&
-     SHA1=$(cat .git/refs/heads/a) &&
-     echo "$SHA1 refs/heads/a" >expect &&
-     git show-ref a >result &&
-     test_cmp expect result'
-
-test_expect_success \
-    'see if a branch still exists when packed' \
-    'git branch b &&
-     git pack-refs --all &&
-     rm -f .git/refs/heads/b &&
-     echo "$SHA1 refs/heads/b" >expect &&
-     git show-ref b >result &&
-     test_cmp expect result'
-
-test_expect_success 'git branch c/d should barf if branch c exists' '
-     git branch c &&
-     git pack-refs --all &&
-     rm -f .git/refs/heads/c &&
-     test_must_fail git branch c/d
-'
-
-test_expect_success \
-    'see if a branch still exists after git pack-refs --prune' \
-    'git branch e &&
-     git pack-refs --all --prune &&
-     echo "$SHA1 refs/heads/e" >expect &&
-     git show-ref e >result &&
-     test_cmp expect result'
-
-test_expect_success 'see if git pack-refs --prune remove ref files' '
-     git branch f &&
-     git pack-refs --all --prune &&
-     ! test -f .git/refs/heads/f
-'
-
-test_expect_success 'see if git pack-refs --prune removes empty dirs' '
-     git branch r/s/t &&
-     git pack-refs --all --prune &&
-     ! test -e .git/refs/heads/r
-'
-
-test_expect_success \
-    'git branch g should work when git branch g/h has been deleted' \
-    'git branch g/h &&
-     git pack-refs --all --prune &&
-     git branch -d g/h &&
-     git branch g &&
-     git pack-refs --all &&
-     git branch -d g'
-
-test_expect_success 'git branch i/j/k should barf if branch i exists' '
-     git branch i &&
-     git pack-refs --all --prune &&
-     test_must_fail git branch i/j/k
-'
-
-test_expect_success \
-    'test git branch k after branch k/l/m and k/lm have been deleted' \
-    'git branch k/l &&
-     git branch k/lm &&
-     git branch -d k/l &&
-     git branch k/l/m &&
-     git branch -d k/l/m &&
-     git branch -d k/lm &&
-     git branch k'
-
-test_expect_success \
-    'test git branch n after some branch deletion and pruning' \
-    'git branch n/o &&
-     git branch n/op &&
-     git branch -d n/o &&
-     git branch n/o/p &&
-     git branch -d n/op &&
-     git pack-refs --all --prune &&
-     git branch -d n/o/p &&
-     git branch n'
-
-test_expect_success \
-	'see if up-to-date packed refs are preserved' \
-	'git branch q &&
-	 git pack-refs --all --prune &&
-	 git update-ref refs/heads/q refs/heads/q &&
-	 ! test -f .git/refs/heads/q'
-
-test_expect_success 'pack, prune and repack' '
-	git tag foo &&
-	git pack-refs --all --prune &&
-	git show-ref >all-of-them &&
-	git pack-refs &&
-	git show-ref >again &&
-	test_cmp all-of-them again
-'
-
-test_expect_success 'explicit pack-refs with dangling packed reference' '
-	git commit --allow-empty -m "soon to be garbage-collected" &&
-	git pack-refs --all &&
-	git reset --hard HEAD^ &&
-	git reflog expire --expire=all --all &&
-	git prune --expire=all &&
-	git pack-refs --all 2>result &&
-	test_must_be_empty result
-'
-
-test_expect_success 'delete ref with dangling packed version' '
-	git checkout -b lamb &&
-	git commit --allow-empty -m "future garbage" &&
-	git pack-refs --all &&
-	git reset --hard HEAD^ &&
-	git checkout master &&
-	git reflog expire --expire=all --all &&
-	git prune --expire=all &&
-	git branch -d lamb 2>result &&
-	test_must_be_empty result
-'
-
-test_expect_success 'delete ref while another dangling packed ref' '
-	git branch lamb &&
-	git commit --allow-empty -m "future garbage" &&
-	git pack-refs --all &&
-	git reset --hard HEAD^ &&
-	git reflog expire --expire=all --all &&
-	git prune --expire=all &&
-	git branch -d lamb 2>result &&
-	test_must_be_empty result
-'
-
-test_expect_success 'pack ref directly below refs/' '
-	git update-ref refs/top HEAD &&
-	git pack-refs --all --prune &&
-	grep refs/top .git/packed-refs &&
-	test_path_is_missing .git/refs/top
-'
-
-test_expect_success 'do not pack ref in refs/bisect' '
-	git update-ref refs/bisect/local HEAD &&
-	git pack-refs --all --prune &&
-	! grep refs/bisect/local .git/packed-refs >/dev/null &&
-	test_path_is_file .git/refs/bisect/local
-'
-
-test_expect_success 'disable reflogs' '
-	git config core.logallrefupdates false &&
-	rm -rf .git/logs
-'
-
-test_expect_success 'create packed foo/bar/baz branch' '
-	git branch foo/bar/baz &&
-	git pack-refs --all --prune &&
-	test_path_is_missing .git/refs/heads/foo/bar/baz &&
-	test_must_fail git reflog exists refs/heads/foo/bar/baz
-'
-
-test_expect_success 'notice d/f conflict with existing directory' '
-	test_must_fail git branch foo &&
-	test_must_fail git branch foo/bar
-'
-
-test_expect_success 'existing directory reports concrete ref' '
-	test_must_fail git branch foo 2>stderr &&
-	test_i18ngrep refs/heads/foo/bar/baz stderr
-'
-
-test_expect_success 'notice d/f conflict with existing ref' '
-	test_must_fail git branch foo/bar/baz/extra &&
-	test_must_fail git branch foo/bar/baz/lots/of/extra/components
-'
-
-test_expect_success 'reject packed-refs with unterminated line' '
-	cp .git/packed-refs .git/packed-refs.bak &&
-	test_when_finished "mv .git/packed-refs.bak .git/packed-refs" &&
-	printf "%s" "$HEAD refs/zzzzz" >>.git/packed-refs &&
-	echo "fatal: unterminated line in .git/packed-refs: $HEAD refs/zzzzz" >expected_err &&
-	test_must_fail git for-each-ref >out 2>err &&
-	test_cmp expected_err err
-'
-
-test_expect_success 'reject packed-refs containing junk' '
-	cp .git/packed-refs .git/packed-refs.bak &&
-	test_when_finished "mv .git/packed-refs.bak .git/packed-refs" &&
-	printf "%s\n" "bogus content" >>.git/packed-refs &&
-	echo "fatal: unexpected line in .git/packed-refs: bogus content" >expected_err &&
-	test_must_fail git for-each-ref >out 2>err &&
-	test_cmp expected_err err
-'
-
-test_expect_success 'reject packed-refs with a short SHA-1' '
-	cp .git/packed-refs .git/packed-refs.bak &&
-	test_when_finished "mv .git/packed-refs.bak .git/packed-refs" &&
-	printf "%.7s %s\n" $HEAD refs/zzzzz >>.git/packed-refs &&
-	printf "fatal: unexpected line in .git/packed-refs: %.7s %s\n" $HEAD refs/zzzzz >expected_err &&
-	test_must_fail git for-each-ref >out 2>err &&
-	test_cmp expected_err err
-'
-
-test_expect_success 'timeout if packed-refs.lock exists' '
-	LOCK=.git/packed-refs.lock &&
-	>"$LOCK" &&
-	test_when_finished "rm -f $LOCK" &&
-	test_must_fail git pack-refs --all --prune
-'
-
-test_expect_success 'retry acquiring packed-refs.lock' '
-	LOCK=.git/packed-refs.lock &&
-	>"$LOCK" &&
-	test_when_finished "wait && rm -f $LOCK" &&
-	{
-		( sleep 1 && rm -f $LOCK ) &
-	} &&
-	git -c core.packedrefstimeout=3000 pack-refs --all --prune
-'
-
-test_expect_success SYMLINKS 'pack symlinked packed-refs' '
-	# First make sure that symlinking works when reading:
-	git update-ref refs/heads/lossy refs/heads/master &&
-	git for-each-ref >all-refs-before &&
-	mv .git/packed-refs .git/my-deviant-packed-refs &&
-	ln -s my-deviant-packed-refs .git/packed-refs &&
-	git for-each-ref >all-refs-linked &&
-	test_cmp all-refs-before all-refs-linked &&
-	git pack-refs --all --prune &&
-	git for-each-ref >all-refs-packed &&
-	test_cmp all-refs-before all-refs-packed &&
-	test -h .git/packed-refs &&
-	test "$(readlink .git/packed-refs)" = "my-deviant-packed-refs"
-'
-
-test_done
diff --git a/t/t3211-peel-ref.sh b/t/t3211-peel-ref.sh
index 3b7caca..9cbc34f 100755
--- a/t/t3211-peel-ref.sh
+++ b/t/t3211-peel-ref.sh
@@ -1,6 +1,10 @@
 #!/bin/sh
 
 test_description='tests for the peel_ref optimization of packed-refs'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'create annotated tag in refs/tags' '
@@ -19,7 +23,7 @@ print_ref() {
 
 test_expect_success 'set up expected show-ref output' '
 	{
-		print_ref "refs/heads/master" &&
+		print_ref "refs/heads/main" &&
 		print_ref "refs/outside/foo" &&
 		print_ref "refs/outside/foo^{}" &&
 		print_ref "refs/tags/base" &&
@@ -47,7 +51,7 @@ test_expect_success 'create old-style pack-refs without fully-peeled' '
 	# know we are emulating exactly what an older git would have written.
 	{
 		echo "# pack-refs with: peeled " &&
-		print_ref "refs/heads/master" &&
+		print_ref "refs/heads/main" &&
 		print_ref "refs/outside/foo" &&
 		print_ref "refs/tags/base" &&
 		print_ref "refs/tags/foo" &&
diff --git a/t/t3300-funny-names.sh b/t/t3300-funny-names.sh
index 04de03c..d3ac826 100755
--- a/t/t3300-funny-names.sh
+++ b/t/t3300-funny-names.sh
@@ -9,6 +9,7 @@ This test tries pathnames with funny characters in the working
 tree, index, and tree objects.
 '
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 HT='	'
@@ -181,7 +182,7 @@ test_expect_success 'diffstat for rename quotes funny filename' '
 	git diff-index -M -p $t0 >diff &&
 	git apply --stat <diff >diffstat &&
 	sed -e "s/|.*//" -e "s/ *\$//" <diffstat >current &&
-	test_i18ncmp expected current
+	test_cmp expected current
 '
 
 test_expect_success 'numstat for rename quotes funny filename' '
diff --git a/t/t3301-notes.sh b/t/t3301-notes.sh
index 8f43303..cf23c06 100755
--- a/t/t3301-notes.sh
+++ b/t/t3301-notes.sh
@@ -362,6 +362,7 @@ test_expect_success 'do not create empty note with -m ""' '
 '
 
 test_expect_success 'create note with combination of -m and -F' '
+	test_when_finished git notes remove HEAD &&
 	cat >expect-combine_m_and_F <<-EOF &&
 		foo
 
@@ -380,6 +381,41 @@ test_expect_success 'create note with combination of -m and -F' '
 	test_cmp expect-combine_m_and_F actual
 '
 
+test_expect_success 'create note with combination of -m and -F and --separator' '
+	test_when_finished git notes remove HEAD &&
+	cat >expect-combine_m_and_F <<-\EOF &&
+	foo
+	-------
+	xyzzy
+	-------
+	bar
+	-------
+	zyxxy
+	-------
+	baz
+	EOF
+	echo "xyzzy" >note_a &&
+	echo "zyxxy" >note_b &&
+	git notes add -m "foo" -F note_a -m "bar" -F note_b -m "baz" --separator="-------" &&
+	git notes show >actual &&
+	test_cmp expect-combine_m_and_F actual
+'
+
+test_expect_success 'create note with combination of -m and -F and --no-separator' '
+	cat >expect-combine_m_and_F <<-\EOF &&
+	foo
+	xyzzy
+	bar
+	zyxxy
+	baz
+	EOF
+	echo "xyzzy" >note_a &&
+	echo "zyxxy" >note_b &&
+	git notes add -m "foo" -F note_a -m "bar" -F note_b -m "baz" --no-separator &&
+	git notes show >actual &&
+	test_cmp expect-combine_m_and_F actual
+'
+
 test_expect_success 'remove note with "git notes remove"' '
 	git notes remove HEAD^ &&
 	git notes remove &&
@@ -505,6 +541,11 @@ test_expect_success 'list notes with "git notes"' '
 	test_cmp expect actual
 '
 
+test_expect_success '"git notes" without subcommand does not take arguments' '
+	test_expect_code 129 git notes HEAD^^ 2>err &&
+	grep "^error: unknown subcommand" err
+'
+
 test_expect_success 'list specific note with "git notes list <object>"' '
 	git rev-parse refs/notes/commits:$commit_3 >expect &&
 	git notes list HEAD^^ >actual &&
@@ -516,6 +557,112 @@ test_expect_success 'listing non-existing notes fails' '
 	test_must_be_empty actual
 '
 
+test_expect_success 'append: specify a separator with an empty arg' '
+	test_when_finished git notes remove HEAD &&
+	cat >expect <<-\EOF &&
+	notes-1
+
+	notes-2
+	EOF
+
+	git notes add -m "notes-1" &&
+	git notes append --separator="" -m "notes-2" &&
+	git notes show >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'append: specify a separator without arg' '
+	test_when_finished git notes remove HEAD &&
+	cat >expect <<-\EOF &&
+	notes-1
+
+	notes-2
+	EOF
+
+	git notes add -m "notes-1" &&
+	git notes append --separator -m "notes-2" &&
+	git notes show >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'append: specify as --no-separator' '
+	test_when_finished git notes remove HEAD &&
+	cat >expect <<-\EOF &&
+	notes-1
+	notes-2
+	EOF
+
+	git notes add -m "notes-1" &&
+	git notes append --no-separator -m "notes-2" &&
+	git notes show >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'append: specify separator with line break' '
+	test_when_finished git notes remove HEAD &&
+	cat >expect <<-\EOF &&
+	notes-1
+	-------
+	notes-2
+	EOF
+
+	git notes add -m "notes-1" &&
+	git notes append --separator="-------$LF" -m "notes-2" &&
+	git notes show >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'append: specify separator without line break' '
+	test_when_finished git notes remove HEAD &&
+	cat >expect <<-\EOF &&
+	notes-1
+	-------
+	notes-2
+	EOF
+
+	git notes add -m "notes-1" &&
+	git notes append --separator="-------" -m "notes-2" &&
+	git notes show >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'append: specify separator with multiple messages' '
+	test_when_finished git notes remove HEAD &&
+	cat >expect <<-\EOF &&
+	notes-1
+	-------
+	notes-2
+	-------
+	notes-3
+	EOF
+
+	git notes add -m "notes-1" &&
+	git notes append --separator="-------" -m "notes-2" -m "notes-3" &&
+	git notes show >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'append note with combination of -m and -F and --separator' '
+	test_when_finished git notes remove HEAD &&
+	cat >expect-combine_m_and_F <<-\EOF &&
+	m-notes-1
+	-------
+	f-notes-1
+	-------
+	m-notes-2
+	-------
+	f-notes-2
+	-------
+	m-notes-3
+	EOF
+
+	echo "f-notes-1" >note_a &&
+	echo "f-notes-2" >note_b &&
+	git notes append -m "m-notes-1" -F note_a -m "m-notes-2" -F note_b -m "m-notes-3" --separator="-------" &&
+	git notes show >actual &&
+	test_cmp expect-combine_m_and_F actual
+'
+
 test_expect_success 'append to existing note with "git notes append"' '
 	cat >expect <<-EOF &&
 		Initial set of notes
@@ -672,6 +819,11 @@ test_expect_success 'notes.displayRef respects order' '
 	test_cmp expect-both-reversed actual
 '
 
+test_expect_success 'notes.displayRef with no value handled gracefully' '
+	test_must_fail git -c notes.displayRef log -0 --notes &&
+	test_must_fail git -c notes.displayRef diff-tree --notes HEAD
+'
+
 test_expect_success 'GIT_NOTES_DISPLAY_REF works' '
 	GIT_NOTES_DISPLAY_REF=refs/notes/commits:refs/notes/other \
 		git log -2 >actual &&
@@ -808,6 +960,33 @@ test_expect_success 'create note from blob with "git notes add -C" reuses blob i
 	test_cmp blob actual
 '
 
+test_expect_success 'create note from blob with "-C", also specify "-m", "-F" and "--separator"' '
+	# 8th will be reuseed in following tests, so rollback when the test is done
+	test_when_finished "git notes remove && git notes add -C $(cat blob)" &&
+	commit=$(git rev-parse HEAD) &&
+	cat >expect <<-EOF &&
+		commit $commit
+		Author: A U Thor <author@example.com>
+		Date:   Thu Apr 7 15:20:13 2005 -0700
+
+		${indent}8th
+
+		Notes:
+		${indent}This is a blob object
+		${indent}-------
+		${indent}This is created by -m
+		${indent}-------
+		${indent}This is created by -F
+	EOF
+
+	git notes remove &&
+	echo "This is a blob object" | git hash-object -w --stdin >blob &&
+	echo "This is created by -F" >note_a &&
+	git notes add -C $(cat blob) -m "This is created by -m" -F note_a --separator="-------" &&
+	git log -1 >actual &&
+	test_cmp expect actual
+'
+
 test_expect_success 'create note from other note with "git notes add -c"' '
 	test_commit 9th &&
 	commit=$(git rev-parse HEAD) &&
@@ -1288,18 +1467,18 @@ test_expect_success 'GIT_NOTES_REWRITE_REF overrides config' '
 	grep "replacement note 3" actual
 '
 
-test_expect_success 'git notes copy diagnoses too many or too few parameters' '
+test_expect_success 'git notes copy diagnoses too many or too few arguments' '
 	test_must_fail git notes copy 2>error &&
-	test_i18ngrep "too few parameters" error &&
+	test_grep "too few arguments" error &&
 	test_must_fail git notes copy one two three 2>error &&
-	test_i18ngrep "too many parameters" error
+	test_grep "too many arguments" error
 '
 
-test_expect_success 'git notes get-ref expands refs/heads/master to refs/notes/refs/heads/master' '
+test_expect_success 'git notes get-ref expands refs/heads/main to refs/notes/refs/heads/main' '
 	test_unconfig core.notesRef &&
 	sane_unset GIT_NOTES_REF &&
-	echo refs/notes/refs/heads/master >expect &&
-	git notes --ref=refs/heads/master get-ref >actual &&
+	echo refs/notes/refs/heads/main >expect &&
+	git notes --ref=refs/heads/main get-ref >actual &&
 	test_cmp expect actual
 '
 
diff --git a/t/t3302-notes-index-expensive.sh b/t/t3302-notes-index-expensive.sh
index 7217c5e..d0c4d38 100755
--- a/t/t3302-notes-index-expensive.sh
+++ b/t/t3302-notes-index-expensive.sh
@@ -5,6 +5,10 @@
 
 test_description='Test commit notes index (expensive!)'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 create_repo () {
@@ -20,7 +24,7 @@ create_repo () {
 			notemark=$(($mark+1))
 			test_tick &&
 			cat <<-INPUT_END &&
-			commit refs/heads/master
+			commit refs/heads/main
 			mark :$mark
 			committer $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> $GIT_COMMITTER_DATE
 			data <<COMMIT
@@ -61,7 +65,8 @@ create_repo () {
 test_notes () {
 	count=$1 &&
 	git config core.notesRef refs/notes/commits &&
-	git log | grep "^    " >output &&
+	git log >tmp &&
+	grep "^    " tmp >output &&
 	i=$count &&
 	while test $i -gt 0
 	do
@@ -86,7 +91,7 @@ write_script time_notes <<\EOF
 			unset GIT_NOTES_REF
 			;;
 		esac
-		git log
+		git log || exit $?
 		i=$(($i+1))
 	done >/dev/null
 EOF
diff --git a/t/t3303-notes-subtrees.sh b/t/t3303-notes-subtrees.sh
index 704aee8..bc9b791 100755
--- a/t/t3303-notes-subtrees.sh
+++ b/t/t3303-notes-subtrees.sh
@@ -2,6 +2,10 @@
 
 test_description='Test commit notes organized in subtrees'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 number_of_commits=100
@@ -27,7 +31,7 @@ verify_notes () {
 	while [ $i -gt 0 ]; do
 		echo "    commit #$i" &&
 		echo "    note for commit #$i" &&
-		i=$(($i-1));
+		i=$(($i-1)) || return 1
 	done > expect &&
 	test_cmp expect output
 }
@@ -39,8 +43,8 @@ test_expect_success "setup: create $number_of_commits commits" '
 		while [ $nr -lt $number_of_commits ]; do
 			nr=$(($nr+1)) &&
 			test_tick &&
-			cat <<INPUT_END
-commit refs/heads/master
+			cat <<INPUT_END || return 1
+commit refs/heads/main
 committer $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> $GIT_COMMITTER_DATE
 data <<COMMIT
 commit #$nr
@@ -75,7 +79,7 @@ test_sha1_based () {
 	(
 		start_note_commit &&
 		nr=$number_of_commits &&
-		git rev-list refs/heads/master |
+		git rev-list refs/heads/main >out &&
 		while read sha1; do
 			note_path=$(echo "$sha1" | sed "$1")
 			cat <<INPUT_END &&
@@ -87,9 +91,9 @@ EOF
 INPUT_END
 
 			nr=$(($nr-1))
-		done
-	) |
-	git fast-import --quiet
+		done <out
+	) >gfi &&
+	git fast-import --quiet <gfi
 }
 
 test_expect_success 'test notes in 2/38-fanout' 'test_sha1_based "s|^..|&/|"'
@@ -105,7 +109,7 @@ test_same_notes () {
 	(
 		start_note_commit &&
 		nr=$number_of_commits &&
-		git rev-list refs/heads/master |
+		git rev-list refs/heads/main |
 		while read sha1; do
 			first_note_path=$(echo "$sha1" | sed "$1")
 			second_note_path=$(echo "$sha1" | sed "$2")
@@ -144,7 +148,7 @@ test_concatenated_notes () {
 	(
 		start_note_commit &&
 		nr=$number_of_commits &&
-		git rev-list refs/heads/master |
+		git rev-list refs/heads/main |
 		while read sha1; do
 			first_note_path=$(echo "$sha1" | sed "$1")
 			second_note_path=$(echo "$sha1" | sed "$2")
@@ -175,7 +179,7 @@ verify_concatenated_notes () {
 		echo "    first note for commit #$i" &&
 		echo "    " &&
 		echo "    second note for commit #$i" &&
-		i=$(($i-1));
+		i=$(($i-1)) || return 1
 	done > expect &&
 	test_cmp expect output
 }
diff --git a/t/t3304-notes-mixed.sh b/t/t3304-notes-mixed.sh
index 1709e8c..2c3a245 100755
--- a/t/t3304-notes-mixed.sh
+++ b/t/t3304-notes-mixed.sh
@@ -2,6 +2,10 @@
 
 test_description='Test notes trees that also contain non-notes'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 number_of_commits=100
@@ -36,7 +40,7 @@ test_expect_success "setup: create a couple of commits" '
 
 	test_tick &&
 	cat <<INPUT_END >input &&
-commit refs/heads/master
+commit refs/heads/main
 committer $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> $GIT_COMMITTER_DATE
 data <<COMMIT
 commit #1
@@ -51,7 +55,7 @@ INPUT_END
 
 	test_tick &&
 	cat <<INPUT_END >>input &&
-commit refs/heads/master
+commit refs/heads/main
 committer $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> $GIT_COMMITTER_DATE
 data <<COMMIT
 commit #2
@@ -68,8 +72,8 @@ INPUT_END
 
 test_expect_success "create a notes tree with both notes and non-notes" '
 
-	commit1=$(git rev-parse refs/heads/master^) &&
-	commit2=$(git rev-parse refs/heads/master) &&
+	commit1=$(git rev-parse refs/heads/main^) &&
+	commit2=$(git rev-parse refs/heads/main) &&
 	test_tick &&
 	cat <<INPUT_END >input &&
 commit refs/notes/commits
diff --git a/t/t3305-notes-fanout.sh b/t/t3305-notes-fanout.sh
index 94c1b02..1ec1fb6 100755
--- a/t/t3305-notes-fanout.sh
+++ b/t/t3305-notes-fanout.sh
@@ -2,13 +2,14 @@
 
 test_description='Test that adding/removing many notes triggers automatic fanout restructuring'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 path_has_fanout() {
 	path=$1 &&
 	fanout=$2 &&
 	after_last_slash=$(($(test_oid hexsz) - $fanout * 2)) &&
-	echo $path | grep -q "^\([0-9a-f]\{2\}/\)\{$fanout\}[0-9a-f]\{$after_last_slash\}$"
+	echo $path | grep -q -E "^([0-9a-f]{2}/){$fanout}[0-9a-f]{$after_last_slash}$"
 }
 
 touched_one_note_with_fanout() {
@@ -23,7 +24,7 @@ touched_one_note_with_fanout() {
 all_notes_have_fanout() {
 	notes_commit=$1 &&
 	fanout=$2 &&
-	git ls-tree -r --name-only $notes_commit 2>/dev/null |
+	git ls-tree -r --name-only $notes_commit |
 	while read path
 	do
 		path_has_fanout $path $fanout || return 1
@@ -51,13 +52,14 @@ test_expect_success 'creating many notes with git-notes' '
 '
 
 test_expect_success 'many notes created correctly with git-notes' '
-	git log | grep "^    " > output &&
+	git log >output.raw &&
+	grep "^    " output.raw >output &&
 	i=$num_notes &&
 	while test $i -gt 0
 	do
 		echo "    commit #$i" &&
 		echo "    note #$i" &&
-		i=$(($i - 1));
+		i=$(($i - 1)) || return 1
 	done > expect &&
 	test_cmp expect output
 '
@@ -90,13 +92,13 @@ test_expect_success 'stable fanout 0 is followed by stable fanout 1' '
 test_expect_success 'deleting most notes with git-notes' '
 	remove_notes=285 &&
 	i=0 &&
-	git rev-list HEAD |
+	git rev-list HEAD >revs &&
 	while test $i -lt $remove_notes && read sha1
 	do
 		i=$(($i + 1)) &&
 		test_tick &&
-		git notes remove "$sha1" 2>/dev/null || return 1
-	done
+		git notes remove "$sha1" || return 1
+	done <revs
 '
 
 test_expect_success 'most notes deleted correctly with git-notes' '
@@ -106,7 +108,7 @@ test_expect_success 'most notes deleted correctly with git-notes' '
 	do
 		echo "    commit #$i" &&
 		echo "    note #$i" &&
-		i=$(($i - 1));
+		i=$(($i - 1)) || return 1
 	done > expect &&
 	test_cmp expect output
 '
diff --git a/t/t3307-notes-man.sh b/t/t3307-notes-man.sh
index 1aa366a..ae31650 100755
--- a/t/t3307-notes-man.sh
+++ b/t/t3307-notes-man.sh
@@ -4,6 +4,7 @@ test_description='Examples from the git-notes man page
 
 Make sure the manual is not full of lies.'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
diff --git a/t/t3308-notes-merge.sh b/t/t3308-notes-merge.sh
index d69c84c..202702b 100755
--- a/t/t3308-notes-merge.sh
+++ b/t/t3308-notes-merge.sh
@@ -108,7 +108,7 @@ test_expect_success 'fail to merge into various non-notes refs' '
 	git update-ref refs/notes/dir/foo HEAD &&
 	test_must_fail git -c "core.notesRef=refs/notes/dir" notes merge x &&
 	test_must_fail git -c "core.notesRef=refs/notes/dir/" notes merge x &&
-	test_must_fail git -c "core.notesRef=refs/heads/master" notes merge x &&
+	test_must_fail git -c "core.notesRef=refs/heads/main" notes merge x &&
 	test_must_fail git -c "core.notesRef=refs/notes/y:" notes merge x &&
 	test_must_fail git -c "core.notesRef=refs/notes/y:foo" notes merge x &&
 	test_must_fail git -c "core.notesRef=refs/notes/foo^{bar" notes merge x
diff --git a/t/t3309-notes-merge-auto-resolve.sh b/t/t3309-notes-merge-auto-resolve.sh
index 141d3e4..9bd5dbf 100755
--- a/t/t3309-notes-merge-auto-resolve.sh
+++ b/t/t3309-notes-merge-auto-resolve.sh
@@ -360,7 +360,12 @@ test_expect_success 'merge z into y with invalid strategy => Fail/No changes' '
 
 test_expect_success 'merge z into y with invalid configuration option => Fail/No changes' '
 	git config core.notesRef refs/notes/y &&
-	test_must_fail git -c notes.mergeStrategy="foo" notes merge z &&
+	cat >expect <<-\EOF &&
+	error: unknown notes merge strategy foo
+	fatal: unable to parse '\''notes.mergeStrategy'\'' from command-line config
+	EOF
+	test_must_fail git -c notes.mergeStrategy="foo" notes merge z 2>actual &&
+	test_cmp expect actual &&
 	# Verify no changes (y)
 	verify_notes y y
 '
diff --git a/t/t3310-notes-merge-manual-resolve.sh b/t/t3310-notes-merge-manual-resolve.sh
index d3d72e2..597df5e 100755
--- a/t/t3310-notes-merge-manual-resolve.sh
+++ b/t/t3310-notes-merge-manual-resolve.sh
@@ -216,7 +216,7 @@ test_expect_success 'merge z into m (== y) with default ("manual") resolver => C
 	git config core.notesRef refs/notes/m &&
 	test_must_fail git notes merge z >output 2>&1 &&
 	# Output should point to where to resolve conflicts
-	test_i18ngrep "\\.git/NOTES_MERGE_WORKTREE" output &&
+	test_grep "\\.git/NOTES_MERGE_WORKTREE" output &&
 	# Inspect merge conflicts
 	ls .git/NOTES_MERGE_WORKTREE >output_conflicts &&
 	test_cmp expect_conflicts output_conflicts &&
@@ -263,7 +263,7 @@ test_expect_success 'cannot do merge w/conflicts when previous merge is unfinish
 	test -d .git/NOTES_MERGE_WORKTREE &&
 	test_must_fail git notes merge z >output 2>&1 &&
 	# Output should indicate what is wrong
-	test_i18ngrep -q "\\.git/NOTES_MERGE_\\* exists" output
+	test_grep -q "\\.git/NOTES_MERGE_\\* exists" output
 '
 
 # Setup non-conflicting merge between x and new notes ref w
@@ -417,7 +417,7 @@ test_expect_success 'redo merge of z into m (== y) with default ("manual") resol
 	git config core.notesRef refs/notes/m &&
 	test_must_fail git notes merge z >output 2>&1 &&
 	# Output should point to where to resolve conflicts
-	test_i18ngrep "\\.git/NOTES_MERGE_WORKTREE" output &&
+	test_grep "\\.git/NOTES_MERGE_WORKTREE" output &&
 	# Inspect merge conflicts
 	ls .git/NOTES_MERGE_WORKTREE >output_conflicts &&
 	test_cmp expect_conflicts output_conflicts &&
@@ -449,7 +449,7 @@ git rev-parse refs/notes/z > pre_merge_z
 test_expect_success 'redo merge of z into m (== y) with default ("manual") resolver => Conflicting 3-way merge' '
 	test_must_fail git notes merge z >output 2>&1 &&
 	# Output should point to where to resolve conflicts
-	test_i18ngrep "\\.git/NOTES_MERGE_WORKTREE" output &&
+	test_grep "\\.git/NOTES_MERGE_WORKTREE" output &&
 	# Inspect merge conflicts
 	ls .git/NOTES_MERGE_WORKTREE >output_conflicts &&
 	test_cmp expect_conflicts output_conflicts &&
@@ -528,7 +528,7 @@ test_expect_success 'redo merge of z into m (== y) with default ("manual") resol
 	git update-ref refs/notes/m refs/notes/y &&
 	test_must_fail git notes merge z >output 2>&1 &&
 	# Output should point to where to resolve conflicts
-	test_i18ngrep "\\.git/NOTES_MERGE_WORKTREE" output &&
+	test_grep "\\.git/NOTES_MERGE_WORKTREE" output &&
 	# Inspect merge conflicts
 	ls .git/NOTES_MERGE_WORKTREE >output_conflicts &&
 	test_cmp expect_conflicts output_conflicts &&
@@ -561,9 +561,9 @@ y and z notes on 4th commit
 EOF
 	# Fail to finalize merge
 	test_must_fail git notes merge --commit >output 2>&1 &&
-	# .git/NOTES_MERGE_* must remain
-	test -f .git/NOTES_MERGE_PARTIAL &&
-	test -f .git/NOTES_MERGE_REF &&
+	# NOTES_MERGE_* refs and .git/NOTES_MERGE_* state files must remain
+	git rev-parse --verify NOTES_MERGE_PARTIAL &&
+	git rev-parse --verify NOTES_MERGE_REF &&
 	test -f .git/NOTES_MERGE_WORKTREE/$commit_sha1 &&
 	test -f .git/NOTES_MERGE_WORKTREE/$commit_sha2 &&
 	test -f .git/NOTES_MERGE_WORKTREE/$commit_sha3 &&
@@ -573,9 +573,9 @@ EOF
 	test "$(git rev-parse refs/notes/y)" = "$(git rev-parse NOTES_MERGE_PARTIAL^1)" &&
 	test "$(git rev-parse refs/notes/m)" != "$(git rev-parse NOTES_MERGE_PARTIAL^1)" &&
 	# Mention refs/notes/m, and its current and expected value in output
-	test_i18ngrep -q "refs/notes/m" output &&
-	test_i18ngrep -q "$(git rev-parse refs/notes/m)" output &&
-	test_i18ngrep -q "$(git rev-parse NOTES_MERGE_PARTIAL^1)" output &&
+	test_grep -q "refs/notes/m" output &&
+	test_grep -q "$(git rev-parse refs/notes/m)" output &&
+	test_grep -q "$(git rev-parse NOTES_MERGE_PARTIAL^1)" output &&
 	# Verify that other notes refs has not changed (w, x, y and z)
 	verify_notes w &&
 	verify_notes x &&
diff --git a/t/t3320-notes-merge-worktrees.sh b/t/t3320-notes-merge-worktrees.sh
index 823fdbd..0fd3328 100755
--- a/t/t3320-notes-merge-worktrees.sh
+++ b/t/t3320-notes-merge-worktrees.sh
@@ -5,6 +5,10 @@
 
 test_description='Test merging of notes trees in multiple worktrees'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup commit' '
@@ -36,15 +40,16 @@ test_expect_success 'modify notes ref ourselves (x)' '
 '
 
 test_expect_success 'create some new worktrees' '
-	git worktree add -b newbranch worktree master &&
-	git worktree add -b newbranch2 worktree2 master
+	git worktree add -b newbranch worktree main &&
+	git worktree add -b newbranch2 worktree2 main
 '
 
 test_expect_success 'merge z into y fails and sets NOTES_MERGE_REF' '
 	git config core.notesRef refs/notes/y &&
 	test_must_fail git notes merge z &&
-	echo "ref: refs/notes/y" >expect &&
-	test_cmp expect .git/NOTES_MERGE_REF
+	echo "refs/notes/y" >expect &&
+	git symbolic-ref NOTES_MERGE_REF >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success 'merge z into y while mid-merge in another workdir fails' '
@@ -52,9 +57,9 @@ test_expect_success 'merge z into y while mid-merge in another workdir fails' '
 		cd worktree &&
 		git config core.notesRef refs/notes/y &&
 		test_must_fail git notes merge z 2>err &&
-		test_i18ngrep "a notes merge into refs/notes/y is already in-progress at" err
+		test_grep "a notes merge into refs/notes/y is already in-progress at" err
 	) &&
-	test_path_is_missing .git/worktrees/worktree/NOTES_MERGE_REF
+	test_must_fail git -C worktree symbolic-ref NOTES_MERGE_REF
 '
 
 test_expect_success 'merge z into x while mid-merge on y succeeds' '
@@ -62,11 +67,12 @@ test_expect_success 'merge z into x while mid-merge on y succeeds' '
 		cd worktree2 &&
 		git config core.notesRef refs/notes/x &&
 		test_must_fail git notes merge z >out 2>&1 &&
-		test_i18ngrep "Automatic notes merge failed" out &&
+		test_grep "Automatic notes merge failed" out &&
 		grep -v "A notes merge into refs/notes/x is already in-progress in" out
 	) &&
-	echo "ref: refs/notes/x" >expect &&
-	test_cmp expect .git/worktrees/worktree2/NOTES_MERGE_REF
+	echo "refs/notes/x" >expect &&
+	git -C worktree2 symbolic-ref NOTES_MERGE_REF >actual &&
+	test_cmp expect actual
 '
 
 test_done
diff --git a/t/t3321-notes-stripspace.sh b/t/t3321-notes-stripspace.sh
new file mode 100755
index 0000000..beca346
--- /dev/null
+++ b/t/t3321-notes-stripspace.sh
@@ -0,0 +1,578 @@
+#!/bin/sh
+#
+# Copyright (c) 2023 Teng Long
+#
+
+test_description='Test commit notes with stripspace behavior'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+MULTI_LF="$LF$LF$LF"
+write_script fake_editor <<\EOF
+echo "$MSG" >"$1"
+echo "$MSG" >&2
+EOF
+GIT_EDITOR=./fake_editor
+export GIT_EDITOR
+
+test_expect_success 'setup the commit' '
+	test_commit 1st
+'
+
+test_expect_success 'add note by editor' '
+	test_when_finished "git notes remove" &&
+	cat >expect <<-EOF &&
+	first-line
+
+	second-line
+	EOF
+
+	MSG="${LF}first-line${MULTI_LF}second-line${LF}" git notes add  &&
+	git notes show >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'add note by specifying single "-m", "--stripspace" is the default behavior' '
+	test_when_finished "git notes remove" &&
+	cat >expect <<-EOF &&
+	first-line
+
+	second-line
+	EOF
+
+	git notes add -m "${LF}first-line${MULTI_LF}second-line${LF}" &&
+	git notes show >actual &&
+	test_cmp expect actual &&
+	git notes remove &&
+	git notes add --stripspace -m "${LF}first-line${MULTI_LF}second-line${LF}" &&
+	git notes show >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'add note by specifying single "-m" and "--no-stripspace" ' '
+	test_when_finished "git notes remove" &&
+	cat >expect <<-EOF &&
+	${LF}first-line${MULTI_LF}second-line
+	EOF
+
+	git notes add --no-stripspace \
+		      -m "${LF}first-line${MULTI_LF}second-line${LF}" &&
+	git notes show >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'add note by specifying multiple "-m", "--stripspace" is the default behavior' '
+	test_when_finished "git notes remove" &&
+	cat >expect <<-EOF &&
+	first-line
+
+	second-line
+	EOF
+
+	git notes add -m "${LF}" \
+		      -m "first-line" \
+		      -m "${MULTI_LF}" \
+		      -m "second-line" \
+		      -m "${LF}" &&
+	git notes show >actual &&
+	test_cmp expect actual &&
+	git notes remove &&
+	git notes add --stripspace -m "${LF}" \
+		      -m "first-line" \
+		      -m "${MULTI_LF}" \
+		      -m "second-line" \
+		      -m "${LF}" &&
+	git notes show >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'add notes by specifying multiple "-m" and "--no-stripspace"' '
+	test_when_finished "git notes remove" &&
+	cat >expect <<-EOF &&
+	${LF}
+	first-line
+	${MULTI_LF}
+	second-line${LF}
+	EOF
+
+	git notes add --no-stripspace \
+		      -m "${LF}" \
+		      -m "first-line" \
+		      -m "${MULTI_LF}" \
+		      -m "second-line" \
+		      -m "${LF}" &&
+	git notes show >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'add note by specifying single "-F", "--stripspace" is the default behavior' '
+	test_when_finished "git notes remove" &&
+	cat >expect <<-EOF &&
+	first-line
+
+	second-line
+	EOF
+
+	cat >note-file <<-EOF &&
+	${LF}
+	first-line
+	${MULTI_LF}
+	second-line
+	${LF}
+	EOF
+
+	git notes add -F note-file &&
+	git notes show >actual &&
+	test_cmp expect actual &&
+	git notes remove &&
+	git notes add --stripspace -F note-file &&
+	git notes show >actual
+'
+
+test_expect_success 'add note by specifying single "-F" and "--no-stripspace"' '
+	test_when_finished "git notes remove" &&
+	cat >expect <<-EOF &&
+	${LF}
+	first-line
+	${MULTI_LF}
+	second-line
+	${LF}
+	EOF
+
+	cat >note-file <<-EOF &&
+	${LF}
+	first-line
+	${MULTI_LF}
+	second-line
+	${LF}
+	EOF
+
+	git notes add --no-stripspace -F note-file &&
+	git notes show >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'add note by specifying multiple "-F", "--stripspace" is the default behavior' '
+	test_when_finished "git notes remove" &&
+	cat >expect <<-EOF &&
+	file-1-first-line
+
+	file-1-second-line
+
+	file-2-first-line
+
+	file-2-second-line
+	EOF
+
+	cat >note-file-1 <<-EOF &&
+	${LF}
+	file-1-first-line
+	${MULTI_LF}
+	file-1-second-line
+	${LF}
+	EOF
+
+	cat >note-file-2 <<-EOF &&
+	${LF}
+	file-2-first-line
+	${MULTI_LF}
+	file-2-second-line
+	${LF}
+	EOF
+
+	git notes add -F note-file-1 -F note-file-2 &&
+	git notes show >actual &&
+	test_cmp expect actual &&
+	git notes remove &&
+	git notes add --stripspace -F note-file-1 -F note-file-2 &&
+	git notes show >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'add note by specifying multiple "-F" with "--no-stripspace"' '
+	test_when_finished "git notes remove" &&
+	cat >expect <<-EOF &&
+	${LF}
+	file-1-first-line
+	${MULTI_LF}
+	file-1-second-line
+	${LF}
+
+	${LF}
+	file-2-first-line
+	${MULTI_LF}
+	file-2-second-line
+	${LF}
+	EOF
+
+	cat >note-file-1 <<-EOF &&
+	${LF}
+	file-1-first-line
+	${MULTI_LF}
+	file-1-second-line
+	${LF}
+	EOF
+
+	cat >note-file-2 <<-EOF &&
+	${LF}
+	file-2-first-line
+	${MULTI_LF}
+	file-2-second-line
+	${LF}
+	EOF
+
+	git notes add --no-stripspace -F note-file-1 -F note-file-2 &&
+	git notes show >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'append note by editor' '
+	test_when_finished "git notes remove" &&
+	cat >expect <<-EOF &&
+	first-line
+
+	second-line
+	EOF
+
+	git notes add -m "first-line" &&
+	MSG="${MULTI_LF}second-line${LF}" git notes append  &&
+	git notes show >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'append note by specifying single "-m"' '
+	test_when_finished "git notes remove" &&
+	cat >expect <<-EOF &&
+	first-line
+
+	second-line
+	EOF
+
+	git notes add -m "${LF}first-line" &&
+	git notes append -m "${MULTI_LF}second-line${LF}" &&
+	git notes show >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'append note by specifying multiple "-m"' '
+	test_when_finished "git notes remove" &&
+	cat >expect <<-EOF &&
+	first-line
+
+	second-line
+	EOF
+
+	git notes add -m "${LF}first-line" &&
+	git notes append -m "${MULTI_LF}" \
+		      -m "second-line" \
+		      -m "${LF}" &&
+	git notes show >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'add note by specifying single "-F"' '
+	test_when_finished "git notes remove" &&
+	cat >expect <<-EOF &&
+	first-line
+
+	second-line
+	EOF
+
+	cat >note-file <<-EOF &&
+	${LF}
+	first-line
+	${MULTI_LF}
+	second-line
+	${LF}
+	EOF
+
+	git notes add -F note-file &&
+	git notes show >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'add notes by specifying multiple "-F"' '
+	test_when_finished "git notes remove" &&
+	cat >expect <<-EOF &&
+	file-1-first-line
+
+	file-1-second-line
+
+	file-2-first-line
+
+	file-2-second-line
+	EOF
+
+	cat >note-file-1 <<-EOF &&
+	${LF}
+	file-1-first-line
+	${MULTI_LF}
+	file-1-second-line
+	${LF}
+	EOF
+
+	cat >note-file-2 <<-EOF &&
+	${LF}
+	file-2-first-line
+	${MULTI_LF}
+	file-2-second-line
+	${LF}
+	EOF
+
+	git notes add -F note-file-1 -F note-file-2 &&
+	git notes show >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'append note by specifying single "-F"' '
+	test_when_finished "git notes remove" &&
+	cat >expect <<-EOF &&
+	initial-line
+
+	first-line
+
+	second-line
+	EOF
+
+	cat >note-file <<-EOF &&
+	${LF}
+	first-line
+	${MULTI_LF}
+	second-line
+	${LF}
+	EOF
+
+	git notes add -m "initial-line" &&
+	git notes append -F note-file &&
+	git notes show >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'append notes by specifying multiple "-F"' '
+	test_when_finished "git notes remove" &&
+	cat >expect <<-EOF &&
+	initial-line
+
+	file-1-first-line
+
+	file-1-second-line
+
+	file-2-first-line
+
+	file-2-second-line
+	EOF
+
+	cat >note-file-1 <<-EOF &&
+	${LF}
+	file-1-first-line
+	${MULTI_LF}
+	file-1-second-line
+	${LF}
+	EOF
+
+	cat >note-file-2 <<-EOF &&
+	${LF}
+	file-2-first-line
+	${MULTI_LF}
+	file-2-second-line
+	${LF}
+	EOF
+
+	git notes add -m "initial-line" &&
+	git notes append -F note-file-1 -F note-file-2 &&
+	git notes show >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'append note by specifying multiple "-F" with "--no-stripspace"' '
+	test_when_finished "git notes remove" &&
+	cat >expect <<-EOF &&
+	initial-line
+	${LF}${LF}
+	file-1-first-line
+	${MULTI_LF}
+	file-1-second-line
+	${LF}
+
+	${LF}
+	file-2-first-line
+	${MULTI_LF}
+	file-2-second-line
+	${LF}
+	EOF
+
+	cat >note-file-1 <<-EOF &&
+	${LF}
+	file-1-first-line
+	${MULTI_LF}
+	file-1-second-line
+	${LF}
+	EOF
+
+	cat >note-file-2 <<-EOF &&
+	${LF}
+	file-2-first-line
+	${MULTI_LF}
+	file-2-second-line
+	${LF}
+	EOF
+
+	git notes add -m "initial-line" &&
+	git notes append --no-stripspace -F note-file-1 -F note-file-2 &&
+	git notes show >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'add notes with empty messages' '
+	rev=$(git rev-parse HEAD) &&
+	git notes add -m "${LF}" \
+		      -m "${MULTI_LF}" \
+		      -m "${LF}" >actual 2>&1 &&
+	test_grep "Removing note for object" actual
+'
+
+test_expect_success 'add note by specifying "-C", "--no-stripspace" is the default behavior' '
+	test_when_finished "git notes remove" &&
+	cat >expect <<-EOF &&
+	${LF}
+	first-line
+	${MULTI_LF}
+	second-line
+	${LF}
+	EOF
+
+	git hash-object -w --stdin <expect >blob &&
+	git notes add -C $(cat blob) &&
+	git notes show >actual &&
+	test_cmp expect actual &&
+	git notes remove &&
+	git notes add --no-stripspace -C $(cat blob) &&
+	git notes show >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'reuse note by specifying "-C" and "--stripspace"' '
+	test_when_finished "git notes remove" &&
+	cat >data <<-EOF &&
+	${LF}
+	first-line
+	${MULTI_LF}
+	second-line
+	${LF}
+	EOF
+
+	cat >expect <<-EOF &&
+	first-line
+
+	second-line
+	EOF
+
+	git hash-object -w --stdin <data >blob &&
+	git notes add --stripspace -C $(cat blob) &&
+	git notes show >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'reuse with "-C" and add note with "-m", "-m" will stripspace all together' '
+	test_when_finished "git notes remove" &&
+	cat >data <<-EOF &&
+	${LF}
+	first-line
+	${MULTI_LF}
+	second-line
+	${LF}
+	EOF
+
+	cat >expect <<-EOF &&
+	first-line
+
+	second-line
+
+	third-line
+	EOF
+
+	git hash-object -w --stdin <data >blob &&
+	git notes add -C $(cat blob) -m "third-line" &&
+	git notes show >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'add note with "-m" and reuse note with "-C", "-C" will not stripspace all together' '
+	test_when_finished "git notes remove" &&
+	cat >data <<-EOF &&
+
+	second-line
+	EOF
+
+	cat >expect <<-EOF &&
+	first-line
+	${LF}
+	second-line
+	EOF
+
+	git hash-object -w --stdin <data >blob &&
+	git notes add -m "first-line" -C $(cat blob)  &&
+	git notes show >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'add note by specifying "-c", "--stripspace" is the default behavior' '
+	test_when_finished "git notes remove" &&
+	cat >expect <<-EOF &&
+	first-line
+
+	second-line
+	EOF
+
+	echo "initial-line" | git hash-object -w --stdin >blob &&
+	MSG="${LF}first-line${MULTI_LF}second-line${LF}" git notes add -c $(cat blob) &&
+	git notes show >actual &&
+	test_cmp expect actual &&
+	git notes remove &&
+	MSG="${LF}first-line${MULTI_LF}second-line${LF}" git notes add --stripspace -c $(cat blob) &&
+	git notes show >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'add note by specifying "-c" with "--no-stripspace"' '
+	test_when_finished "git notes remove" &&
+	cat >expect <<-EOF &&
+	${LF}first-line${MULTI_LF}second-line${LF}
+	EOF
+
+	echo "initial-line" | git hash-object -w --stdin >blob &&
+	MSG="${LF}first-line${MULTI_LF}second-line${LF}" git notes add --no-stripspace -c $(cat blob) &&
+	git notes show >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'edit note by specifying "-c", "--stripspace" is the default behavior' '
+	test_when_finished "git notes remove" &&
+	cat >expect <<-EOF &&
+	first-line
+
+	second-line
+	EOF
+
+	MSG="${LF}first-line${MULTI_LF}second-line${LF}" git notes edit &&
+	git notes show >actual &&
+	test_cmp expect actual &&
+	git notes remove &&
+	MSG="${LF}first-line${MULTI_LF}second-line${LF}" git notes edit --stripspace &&
+	git notes show >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'edit note by specifying "-c" with "--no-stripspace"' '
+	test_when_finished "git notes remove" &&
+	cat >expect <<-EOF &&
+	${LF}first-line${MULTI_LF}second-line${LF}
+	EOF
+
+	MSG="${LF}first-line${MULTI_LF}second-line${LF}" git notes add --no-stripspace &&
+	git notes show >actual &&
+	test_cmp expect actual
+'
+
+test_done
diff --git a/t/t3400-rebase.sh b/t/t3400-rebase.sh
index 40d2975..e1c8c5f 100755
--- a/t/t3400-rebase.sh
+++ b/t/t3400-rebase.sh
@@ -8,6 +8,9 @@ test_description='git rebase assorted tests
 This test runs git rebase and checks that the author information is not lost
 among other things.
 '
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 GIT_AUTHOR_NAME=author@name
@@ -15,24 +18,19 @@ GIT_AUTHOR_EMAIL=bogus@email@address
 export GIT_AUTHOR_NAME GIT_AUTHOR_EMAIL
 
 test_expect_success 'prepare repository with topic branches' '
-	git config core.logAllRefUpdates true &&
-	echo First >A &&
-	git update-index --add A &&
-	git commit -m "Add A." &&
+	test_commit "Add A." A First First &&
 	git checkout -b force-3way &&
 	echo Dummy >Y &&
 	git update-index --add Y &&
 	git commit -m "Add Y." &&
 	git checkout -b filemove &&
-	git reset --soft master &&
+	git reset --soft main &&
 	mkdir D &&
 	git mv A D/A &&
 	git commit -m "Move A." &&
-	git checkout -b my-topic-branch master &&
-	echo Second >B &&
-	git update-index --add B &&
-	git commit -m "Add B." &&
-	git checkout -f master &&
+	git checkout -b my-topic-branch main &&
+	test_commit "Add B." B Second Second &&
+	git checkout -f main &&
 	echo Third >>A &&
 	git update-index A &&
 	git commit -m "Modify A." &&
@@ -46,23 +44,23 @@ test_expect_success 'prepare repository with topic branches' '
 
 test_expect_success 'rebase on dirty worktree' '
 	echo dirty >>A &&
-	test_must_fail git rebase master
+	test_must_fail git rebase main
 '
 
 test_expect_success 'rebase on dirty cache' '
 	git add A &&
-	test_must_fail git rebase master
+	test_must_fail git rebase main
 '
 
-test_expect_success 'rebase against master' '
+test_expect_success 'rebase against main' '
 	git reset --hard HEAD &&
-	git rebase master
+	git rebase main
 '
 
 test_expect_success 'rebase sets ORIG_HEAD to pre-rebase state' '
 	git checkout -b orig-head topic &&
 	pre="$(git rev-parse --verify HEAD)" &&
-	git rebase master &&
+	git rebase main &&
 	test_cmp_rev "$pre" ORIG_HEAD &&
 	test_cmp_rev ! "$pre" HEAD
 '
@@ -93,28 +91,28 @@ test_expect_success 'HEAD was detached during rebase' '
 
 test_expect_success 'rebase from ambiguous branch name' '
 	git checkout -b topic side &&
-	git rebase master
+	git rebase main
 '
 
 test_expect_success 'rebase off of the previous branch using "-"' '
-	git checkout master &&
+	git checkout main &&
 	git checkout HEAD^ &&
 	git rebase @{-1} >expect.messages &&
-	git merge-base master HEAD >expect.forkpoint &&
+	git merge-base main HEAD >expect.forkpoint &&
 
-	git checkout master &&
+	git checkout main &&
 	git checkout HEAD^ &&
 	git rebase - >actual.messages &&
-	git merge-base master HEAD >actual.forkpoint &&
+	git merge-base main HEAD >actual.forkpoint &&
 
 	test_cmp expect.forkpoint actual.forkpoint &&
 	# the next one is dubious---we may want to say "-",
 	# instead of @{-1}, in the message
-	test_i18ncmp expect.messages actual.messages
+	test_cmp expect.messages actual.messages
 '
 
 test_expect_success 'rebase a single mode change' '
-	git checkout master &&
+	git checkout main &&
 	git branch -D topic &&
 	echo 1 >X &&
 	git add X &&
@@ -126,7 +124,7 @@ test_expect_success 'rebase a single mode change' '
 	test_chmod +x A &&
 	test_tick &&
 	git commit -m modechange &&
-	GIT_TRACE=1 git rebase master
+	GIT_TRACE=1 git rebase main
 '
 
 test_expect_success 'rebase is not broken by diff.renames' '
@@ -145,8 +143,8 @@ test_expect_success 'Show verbose error when HEAD could not be detached' '
 	>B &&
 	test_when_finished "rm -f B" &&
 	test_must_fail git rebase topic 2>output.err >output.out &&
-	test_i18ngrep "The following untracked working tree files would be overwritten by checkout:" output.err &&
-	test_i18ngrep B output.err
+	test_grep "The following untracked working tree files would be overwritten by checkout:" output.err &&
+	test_grep B output.err
 '
 
 test_expect_success 'fail when upstream arg is missing and not on branch' '
@@ -162,11 +160,11 @@ test_expect_success 'fail when upstream arg is missing and not configured' '
 test_expect_success 'rebase works with format.useAutoBase' '
 	test_config format.useAutoBase true &&
 	git checkout topic &&
-	git rebase master
+	git rebase main
 '
 
 test_expect_success 'default to common base in @{upstream}s reflog if no upstream arg (--merge)' '
-	git checkout -b default-base master &&
+	git checkout -b default-base main &&
 	git checkout -b default topic &&
 	git config branch.default.remote . &&
 	git config branch.default.merge refs/heads/default-base &&
@@ -184,7 +182,7 @@ test_expect_success 'default to common base in @{upstream}s reflog if no upstrea
 '
 
 test_expect_success 'default to common base in @{upstream}s reflog if no upstream arg (--apply)' '
-	git checkout -B default-base master &&
+	git checkout -B default-base main &&
 	git checkout -B default topic &&
 	git config branch.default.remote . &&
 	git config branch.default.merge refs/heads/default-base &&
@@ -226,13 +224,13 @@ test_expect_success 'cherry-picked commits and fork-point work together' '
 
 test_expect_success 'rebase --apply -q is quiet' '
 	git checkout -b quiet topic &&
-	git rebase --apply -q master >output.out 2>&1 &&
+	git rebase --apply -q main >output.out 2>&1 &&
 	test_must_be_empty output.out
 '
 
 test_expect_success 'rebase --merge -q is quiet' '
 	git checkout -B quiet topic &&
-	git rebase --merge -q master >output.out 2>&1 &&
+	git rebase --merge -q main >output.out 2>&1 &&
 	test_must_be_empty output.out
 '
 
@@ -294,7 +292,7 @@ test_expect_success 'rebase commit with an ancient timestamp' '
 '
 
 test_expect_success 'rebase with "From " line in commit message' '
-	git checkout -b preserve-from master~1 &&
+	git checkout -b preserve-from main~1 &&
 	cat >From_.msg <<EOF &&
 Somebody embedded an mbox in a commit message
 
@@ -310,7 +308,7 @@ EOF
 	>From_ &&
 	git add From_ &&
 	git commit -F From_.msg &&
-	git rebase master &&
+	git rebase main &&
 	git log -1 --pretty=format:%B >out &&
 	test_cmp From_.msg out
 '
@@ -357,12 +355,12 @@ test_expect_success 'rebase --apply and .gitattributes' '
 		git cherry-pick test &&
 
 		git checkout test &&
-		git rebase master &&
+		git rebase main &&
 		grep "smudged" a.txt &&
 
 		git checkout removal &&
 		git reset --hard &&
-		git rebase master &&
+		git rebase main &&
 		grep "clean" a.txt
 	)
 '
@@ -385,38 +383,66 @@ test_expect_success 'rebase--merge.sh and --show-current-patch' '
 	)
 '
 
-test_expect_success 'rebase -c rebase.useBuiltin=false warning' '
-	expected="rebase.useBuiltin support has been removed" &&
-
-	# Only warn when the legacy rebase is requested...
-	test_must_fail git -c rebase.useBuiltin=false rebase 2>err &&
-	test_i18ngrep "$expected" err &&
-	test_must_fail env GIT_TEST_REBASE_USE_BUILTIN=false git rebase 2>err &&
-	test_i18ngrep "$expected" err &&
-
-	# ...not when we would have used the built-in anyway
-	test_must_fail git -c rebase.useBuiltin=true rebase 2>err &&
-	test_must_be_empty err &&
-	test_must_fail env GIT_TEST_REBASE_USE_BUILTIN=true git rebase 2>err &&
-	test_must_be_empty err
+test_expect_success 'switch to branch checked out here' '
+	git checkout main &&
+	git rebase main main
 '
 
-test_expect_success 'switch to branch checked out here' '
-	git checkout master &&
-	git rebase master master
+test_expect_success 'switch to branch checked out elsewhere fails' '
+	test_when_finished "
+		git worktree remove wt1 &&
+		git worktree remove wt2 &&
+		git branch -d shared
+	" &&
+	git worktree add wt1 -b shared &&
+	git worktree add wt2 -f shared &&
+	# we test in both worktrees to ensure that works
+	# as expected with "first" and "next" worktrees
+	test_must_fail git -C wt1 rebase shared shared &&
+	test_must_fail git -C wt2 rebase shared shared
 '
 
 test_expect_success 'switch to branch not checked out' '
-	git checkout master &&
+	git checkout main &&
 	git branch other &&
-	git rebase master other
+	git rebase main other
+'
+
+test_expect_success 'switch to non-branch detaches HEAD' '
+	git checkout main &&
+	old_main=$(git rev-parse HEAD) &&
+	git rebase First Second^0 &&
+	test_cmp_rev HEAD Second &&
+	test_cmp_rev main $old_main &&
+	test_must_fail git symbolic-ref HEAD
 '
 
 test_expect_success 'refuse to switch to branch checked out elsewhere' '
-	git checkout master &&
+	git checkout main &&
 	git worktree add wt &&
-	test_must_fail git -C wt rebase master master 2>err &&
-	test_i18ngrep "already checked out" err
+	test_must_fail git -C wt rebase main main 2>err &&
+	test_grep "already used by worktree at" err
+'
+
+test_expect_success 'rebase when inside worktree subdirectory' '
+	git init main-wt &&
+	(
+		cd main-wt &&
+		git commit --allow-empty -m "initial" &&
+		mkdir -p foo/bar &&
+		test_commit foo/bar/baz &&
+		mkdir -p a/b &&
+		test_commit a/b/c &&
+		# create another branch for our other worktree
+		git branch other &&
+		git worktree add ../other-wt other &&
+		cd ../other-wt &&
+		# create and cd into a subdirectory
+		mkdir -p random/dir &&
+		cd random/dir &&
+		# now do the rebase
+		git rebase --onto HEAD^^ HEAD^  # drops the HEAD^ commit
+	)
 '
 
 test_done
diff --git a/t/t3402-rebase-merge.sh b/t/t3402-rebase-merge.sh
index 6e03271..5c67d07 100755
--- a/t/t3402-rebase-merge.sh
+++ b/t/t3402-rebase-merge.sh
@@ -5,6 +5,10 @@
 
 test_description='git rebase --merge test'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 T="A quick brown fox
@@ -19,10 +23,10 @@ test_expect_success setup '
 	git commit -m"initial" &&
 	git branch side &&
 	echo "11 $T" >>original &&
-	git commit -a -m"master updates a bit." &&
+	git commit -a -m"main updates a bit." &&
 
 	echo "12 $T" >>original &&
-	git commit -a -m"master updates a bit more." &&
+	git commit -a -m"main updates a bit more." &&
 
 	git checkout side &&
 	(echo "0 $T" && cat original) >renamed &&
@@ -47,13 +51,13 @@ test_expect_success setup '
 '
 
 test_expect_success 'reference merge' '
-	git merge -s recursive -m "reference merge" master
+	git merge -s recursive -m "reference merge" main
 '
 
 PRE_REBASE=$(git rev-parse test-rebase)
 test_expect_success rebase '
 	git checkout test-rebase &&
-	GIT_TRACE=1 git rebase --merge master
+	GIT_TRACE=1 git rebase --merge main
 '
 
 test_expect_success 'test-rebase@{1} is pre rebase' '
@@ -65,31 +69,31 @@ test_expect_success 'merge and rebase should match' '
 	if test -s difference
 	then
 		cat difference
-		(exit 1)
+		false
 	else
 		echo happy
 	fi
 '
 
 test_expect_success 'rebase the other way' '
-	git reset --hard master &&
+	git reset --hard main &&
 	git rebase --merge side
 '
 
 test_expect_success 'rebase -Xtheirs' '
-	git checkout -b conflicting master~2 &&
+	git checkout -b conflicting main~2 &&
 	echo "AB $T" >> original &&
 	git commit -mconflicting original &&
-	git rebase -Xtheirs master &&
+	git rebase -Xtheirs main &&
 	grep AB original &&
 	! grep 11 original
 '
 
 test_expect_success 'rebase -Xtheirs from orphan' '
-	git checkout --orphan orphan-conflicting master~2 &&
+	git checkout --orphan orphan-conflicting main~2 &&
 	echo "AB $T" >> original &&
 	git commit -morphan-conflicting original &&
-	git rebase -Xtheirs master &&
+	git rebase -Xtheirs main &&
 	grep AB original &&
 	! grep 11 original
 '
@@ -99,7 +103,7 @@ test_expect_success 'merge and rebase should match' '
 	if test -s difference
 	then
 		cat difference
-		(exit 1)
+		false
 	else
 		echo happy
 	fi
@@ -107,14 +111,14 @@ test_expect_success 'merge and rebase should match' '
 
 test_expect_success 'picking rebase' '
 	git reset --hard side &&
-	git rebase --merge --onto master side^^ &&
-	mb=$(git merge-base master HEAD) &&
-	if test "$mb" = "$(git rev-parse master)"
+	git rebase --merge --onto main side^^ &&
+	mb=$(git merge-base main HEAD) &&
+	if test "$mb" = "$(git rev-parse main)"
 	then
 		echo happy
 	else
 		git show-branch
-		(exit 1)
+		false
 	fi &&
 	f=$(git diff-tree --name-only HEAD^ HEAD) &&
 	g=$(git diff-tree --name-only HEAD^^ HEAD^) &&
@@ -124,31 +128,10 @@ test_expect_success 'picking rebase' '
 	*)
 		echo "$f"
 		echo "$g"
-		(exit 1)
+		false
 	esac
 '
 
-test_expect_success 'rebase -s funny -Xopt' '
-	test_when_finished "rm -fr test-bin funny.was.run" &&
-	mkdir test-bin &&
-	cat >test-bin/git-merge-funny <<-EOF &&
-	#!$SHELL_PATH
-	case "\$1" in --opt) ;; *) exit 2 ;; esac
-	shift &&
-	>funny.was.run &&
-	exec git merge-recursive "\$@"
-	EOF
-	chmod +x test-bin/git-merge-funny &&
-	git reset --hard &&
-	git checkout -b test-funny master^ &&
-	test_commit funny &&
-	(
-		PATH=./test-bin:$PATH &&
-		git rebase -s funny -Xopt master
-	) &&
-	test -f funny.was.run
-'
-
 test_expect_success 'rebase --skip works with two conflicts in a row' '
 	git checkout second-side  &&
 	tr "[A-Z]" "[a-z]" <newfile >tmp &&
@@ -165,7 +148,7 @@ test_expect_success 'rebase --skip works with two conflicts in a row' '
 test_expect_success '--reapply-cherry-picks' '
 	git init repo &&
 
-	# O(1-10) -- O(1-11) -- O(0-10) master
+	# O(1-10) -- O(1-11) -- O(0-10) main
 	#        \
 	#         -- O(1-11) -- O(1-12) otherbranch
 
@@ -187,18 +170,18 @@ test_expect_success '--reapply-cherry-picks' '
 	git -C repo commit -a -m "add 12 in another branch" &&
 
 	# Regular rebase fails, because the 1-11 commit is deduplicated
-	test_must_fail git -C repo rebase --merge master 2> err &&
-	test_i18ngrep "error: could not apply.*add 12 in another branch" err &&
+	test_must_fail git -C repo rebase --merge main 2> err &&
+	test_grep "error: could not apply.*add 12 in another branch" err &&
 	git -C repo rebase --abort &&
 
 	# With --reapply-cherry-picks, it works
-	git -C repo rebase --merge --reapply-cherry-picks master
+	git -C repo rebase --merge --reapply-cherry-picks main
 '
 
 test_expect_success '--reapply-cherry-picks refrains from reading unneeded blobs' '
 	git init server &&
 
-	# O(1-10) -- O(1-11) -- O(1-12) master
+	# O(1-10) -- O(1-11) -- O(1-12) main
 	#        \
 	#         -- O(0-10) otherbranch
 
@@ -220,18 +203,18 @@ test_expect_success '--reapply-cherry-picks refrains from reading unneeded blobs
 	test_config -C server uploadpack.allowanysha1inwant 1 &&
 
 	git clone --filter=blob:none "file://$(pwd)/server" client &&
-	git -C client checkout origin/master &&
+	git -C client checkout origin/main &&
 	git -C client checkout origin/otherbranch &&
 
 	# Sanity check to ensure that the blobs from the merge base and "add
 	# 11" are missing
 	git -C client rev-list --objects --all --missing=print >missing_list &&
-	MERGE_BASE_BLOB=$(git -C server rev-parse master^^:file.txt) &&
-	ADD_11_BLOB=$(git -C server rev-parse master^:file.txt) &&
+	MERGE_BASE_BLOB=$(git -C server rev-parse main^^:file.txt) &&
+	ADD_11_BLOB=$(git -C server rev-parse main^:file.txt) &&
 	grep "[?]$MERGE_BASE_BLOB" missing_list &&
 	grep "[?]$ADD_11_BLOB" missing_list &&
 
-	git -C client rebase --merge --reapply-cherry-picks origin/master &&
+	git -C client rebase --merge --reapply-cherry-picks origin/main &&
 
 	# The blob from the merge base had to be fetched, but not "add 11"
 	git -C client rev-list --objects --all --missing=print >missing_list &&
diff --git a/t/t3403-rebase-skip.sh b/t/t3403-rebase-skip.sh
index a927774..a1911c4 100755
--- a/t/t3403-rebase-skip.sh
+++ b/t/t3403-rebase-skip.sh
@@ -5,6 +5,9 @@
 
 test_description='git rebase --merge --skip tests'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 . "$TEST_DIRECTORY"/lib-rebase.sh
@@ -17,6 +20,7 @@ test_expect_success setup '
 	git add hello &&
 	git commit -m "hello" &&
 	git branch skip-reference &&
+	git tag hello &&
 
 	echo world >> hello &&
 	git commit -a -m "hello world" &&
@@ -33,7 +37,8 @@ test_expect_success setup '
 	test_tick &&
 	GIT_AUTHOR_NAME="Another Author" \
 		GIT_AUTHOR_EMAIL="another.author@example.com" \
-		git commit --amend --no-edit -m amended-goodbye &&
+		git commit --amend --no-edit -m amended-goodbye \
+			--reset-author &&
 	test_tick &&
 	git tag amended-goodbye &&
 
@@ -48,7 +53,7 @@ test_expect_success setup '
 	'
 
 test_expect_success 'rebase with git am -3 (default)' '
-	test_must_fail git rebase master
+	test_must_fail git rebase --apply main
 '
 
 test_expect_success 'rebase --skip can not be used with other options' '
@@ -64,7 +69,7 @@ test_expect_success 'rebase moves back to skip-reference' '
 	test refs/heads/skip-reference = $(git symbolic-ref HEAD) &&
 	git branch post-rebase &&
 	git reset --hard pre-rebase &&
-	test_must_fail git rebase master &&
+	test_must_fail git rebase main &&
 	echo "hello" > hello &&
 	git add hello &&
 	git rebase --continue &&
@@ -75,7 +80,7 @@ test_expect_success 'rebase moves back to skip-reference' '
 test_expect_success 'checkout skip-merge' 'git checkout -f skip-merge'
 
 test_expect_success 'rebase with --merge' '
-	test_must_fail git rebase --merge master
+	test_must_fail git rebase --merge main
 '
 
 test_expect_success 'rebase --skip with --merge' '
@@ -92,14 +97,21 @@ test_expect_success 'moved back to branch correctly' '
 
 test_debug 'gitk --all & sleep 1'
 
+test_expect_success 'skipping final pick removes .git/MERGE_MSG' '
+	test_must_fail git rebase --onto hello reverted-goodbye^ \
+		reverted-goodbye &&
+	git rebase --skip &&
+	test_path_is_missing .git/MERGE_MSG
+'
+
 test_expect_success 'correct advice upon picking empty commit' '
 	test_when_finished "git rebase --abort" &&
 	test_must_fail git rebase -i --onto goodbye \
 		amended-goodbye^ amended-goodbye 2>err &&
-	test_i18ngrep "previous cherry-pick is now empty" err &&
-	test_i18ngrep "git rebase --skip" err &&
+	test_grep "previous cherry-pick is now empty" err &&
+	test_grep "git rebase --skip" err &&
 	test_must_fail git commit &&
-	test_i18ngrep "git rebase --skip" err
+	test_grep "git rebase --skip" err
 '
 
 test_expect_success 'correct authorship when committing empty pick' '
@@ -119,10 +131,10 @@ test_expect_success 'correct advice upon rewording empty commit' '
 		test_must_fail env FAKE_LINES="reword 1" git rebase -i \
 			--onto goodbye amended-goodbye^ amended-goodbye 2>err
 	) &&
-	test_i18ngrep "previous cherry-pick is now empty" err &&
-	test_i18ngrep "git rebase --skip" err &&
+	test_grep "previous cherry-pick is now empty" err &&
+	test_grep "git rebase --skip" err &&
 	test_must_fail git commit &&
-	test_i18ngrep "git rebase --skip" err
+	test_grep "git rebase --skip" err
 '
 
 test_expect_success 'correct advice upon editing empty commit' '
@@ -132,10 +144,10 @@ test_expect_success 'correct advice upon editing empty commit' '
 		test_must_fail env FAKE_LINES="edit 1" git rebase -i \
 			--onto goodbye amended-goodbye^ amended-goodbye 2>err
 	) &&
-	test_i18ngrep "previous cherry-pick is now empty" err &&
-	test_i18ngrep "git rebase --skip" err &&
+	test_grep "previous cherry-pick is now empty" err &&
+	test_grep "git rebase --skip" err &&
 	test_must_fail git commit &&
-	test_i18ngrep "git rebase --skip" err
+	test_grep "git rebase --skip" err
 '
 
 test_expect_success 'correct advice upon cherry-picking an empty commit during a rebase' '
@@ -145,10 +157,10 @@ test_expect_success 'correct advice upon cherry-picking an empty commit during a
 		test_must_fail env FAKE_LINES="1 exec_git_cherry-pick_amended-goodbye" \
 			git rebase -i goodbye^ goodbye 2>err
 	) &&
-	test_i18ngrep "previous cherry-pick is now empty" err &&
-	test_i18ngrep "git cherry-pick --skip" err &&
+	test_grep "previous cherry-pick is now empty" err &&
+	test_grep "git cherry-pick --skip" err &&
 	test_must_fail git commit 2>err &&
-	test_i18ngrep "git cherry-pick --skip" err
+	test_grep "git cherry-pick --skip" err
 '
 
 test_expect_success 'correct advice upon multi cherry-pick picking an empty commit during a rebase' '
@@ -158,10 +170,10 @@ test_expect_success 'correct advice upon multi cherry-pick picking an empty comm
 		test_must_fail env FAKE_LINES="1 exec_git_cherry-pick_goodbye_amended-goodbye" \
 			git rebase -i goodbye^^ goodbye 2>err
 	) &&
-	test_i18ngrep "previous cherry-pick is now empty" err &&
-	test_i18ngrep "git cherry-pick --skip" err &&
+	test_grep "previous cherry-pick is now empty" err &&
+	test_grep "git cherry-pick --skip" err &&
 	test_must_fail git commit 2>err &&
-	test_i18ngrep "git cherry-pick --skip" err
+	test_grep "git cherry-pick --skip" err
 '
 
 test_expect_success 'fixup that empties commit fails' '
diff --git a/t/t3404-rebase-interactive.sh b/t/t3404-rebase-interactive.sh
index 9744e88..d1bead6 100755
--- a/t/t3404-rebase-interactive.sh
+++ b/t/t3404-rebase-interactive.sh
@@ -12,7 +12,7 @@ Initial setup:
 
      one - two - three - four (conflict-branch)
    /
- A - B - C - D - E            (master)
+ A - B - C - D - E            (primary)
  | \
  |   F - G - H                (branch1)
  |     \
@@ -25,11 +25,13 @@ Initial setup:
  where A, B, D and G all touch file1, and one, two, three, four all
  touch file "conflict".
 '
+
 . ./test-lib.sh
 
 . "$TEST_DIRECTORY"/lib-rebase.sh
 
 test_expect_success 'setup' '
+	git switch -C primary &&
 	test_commit A file1 &&
 	test_commit B file1 &&
 	test_commit C file2 &&
@@ -65,7 +67,7 @@ SHELL=
 export SHELL
 
 test_expect_success 'rebase --keep-empty' '
-	git checkout -b emptybranch master &&
+	git checkout -b emptybranch primary &&
 	git commit --allow-empty -m "empty" &&
 	git rebase --keep-empty -i HEAD~2 &&
 	git log --oneline >actual &&
@@ -82,11 +84,11 @@ test_expect_success 'rebase -i with empty todo list' '
 			git rebase -i HEAD^ >output 2>&1
 	) &&
 	tail -n 1 output >actual &&  # Ignore output about changing todo list
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 test_expect_success 'rebase -i with the exec command' '
-	git checkout master &&
+	git checkout primary &&
 	(
 	set_fake_editor &&
 	FAKE_LINES="1 exec_>touch-one
@@ -97,18 +99,19 @@ test_expect_success 'rebase -i with the exec command' '
 	) &&
 	test_path_is_file touch-one &&
 	test_path_is_file touch-two &&
-	test_path_is_missing touch-three " (should have stopped before)" &&
+	# Missing because we should have stopped by now.
+	test_path_is_missing touch-three &&
 	test_cmp_rev C HEAD &&
 	git rebase --continue &&
 	test_path_is_file touch-three &&
 	test_path_is_file "touch-file  name with spaces" &&
 	test_path_is_file touch-after-semicolon &&
-	test_cmp_rev master HEAD &&
+	test_cmp_rev primary HEAD &&
 	rm -f touch-*
 '
 
 test_expect_success 'rebase -i with the exec command runs from tree root' '
-	git checkout master &&
+	git checkout primary &&
 	mkdir subdir && (cd subdir &&
 	set_fake_editor &&
 	FAKE_LINES="1 exec_>touch-subdir" \
@@ -121,7 +124,7 @@ test_expect_success 'rebase -i with the exec command runs from tree root' '
 test_expect_success 'rebase -i with exec allows git commands in subdirs' '
 	test_when_finished "rm -rf subdir" &&
 	test_when_finished "git rebase --abort ||:" &&
-	git checkout master &&
+	git checkout primary &&
 	mkdir subdir && (cd subdir &&
 	set_fake_editor &&
 	FAKE_LINES="1 x_cd_subdir_&&_git_rev-parse_--is-inside-work-tree" \
@@ -139,24 +142,36 @@ test_expect_success 'rebase -i sets work tree properly' '
 '
 
 test_expect_success 'rebase -i with the exec command checks tree cleanness' '
-	git checkout master &&
+	git checkout primary &&
 	(
 		set_fake_editor &&
 		test_must_fail env FAKE_LINES="exec_echo_foo_>file1 1" \
 			git rebase -i HEAD^
 	) &&
-	test_cmp_rev master^ HEAD &&
+	test_cmp_rev primary^ HEAD &&
 	git reset --hard &&
 	git rebase --continue
 '
 
+test_expect_success 'cherry-pick works with rebase --exec' '
+	test_when_finished "git cherry-pick --abort; \
+			    git rebase --abort; \
+			    git checkout primary" &&
+	echo "exec git cherry-pick G" >todo &&
+	(
+		set_replace_editor todo &&
+		test_must_fail git rebase -i D D
+	) &&
+	test_cmp_rev G CHERRY_PICK_HEAD
+'
+
 test_expect_success 'rebase -x with empty command fails' '
 	test_when_finished "git rebase --abort ||:" &&
 	test_must_fail env git rebase -x "" @ 2>actual &&
 	test_write_lines "error: empty exec command" >expected &&
-	test_i18ncmp expected actual &&
+	test_cmp expected actual &&
 	test_must_fail env git rebase -x " " @ 2>actual &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 test_expect_success 'rebase -x with newline in command fails' '
@@ -164,11 +179,11 @@ test_expect_success 'rebase -x with newline in command fails' '
 	test_must_fail env git rebase -x "a${LF}b" @ 2>actual &&
 	test_write_lines "error: exec commands cannot contain newlines" \
 			 >expected &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 test_expect_success 'rebase -i with exec of inexistent command' '
-	git checkout master &&
+	git checkout primary &&
 	test_when_finished "git rebase --abort" &&
 	(
 		set_fake_editor &&
@@ -256,11 +271,11 @@ test_expect_success 'stop on conflicting pick' '
 	D
 	=======
 	G
-	>>>>>>> $commit... G
+	>>>>>>> $commit (G)
 	EOF
 	git tag new-branch1 &&
-	test_must_fail git rebase -i master &&
-	test "$(git rev-parse HEAD~3)" = "$(git rev-parse master)" &&
+	test_must_fail git rebase -i primary &&
+	test "$(git rev-parse HEAD~3)" = "$(git rev-parse primary)" &&
 	test_cmp expect .git/rebase-merge/patch &&
 	test_cmp expect2 file1 &&
 	test "$(git diff --name-status |
@@ -287,11 +302,12 @@ test_expect_success 'abort' '
 test_expect_success 'abort with error when new base cannot be checked out' '
 	git rm --cached file1 &&
 	git commit -m "remove file in base" &&
-	test_must_fail git rebase -i master > output 2>&1 &&
-	test_i18ngrep "The following untracked working tree files would be overwritten by checkout:" \
+	test_must_fail git rebase -i primary > output 2>&1 &&
+	test_grep "The following untracked working tree files would be overwritten by checkout:" \
 		output &&
-	test_i18ngrep "file1" output &&
+	test_grep "file1" output &&
 	test_path_is_missing .git/rebase-merge &&
+	rm file1 &&
 	git reset --hard HEAD^
 '
 
@@ -301,7 +317,7 @@ test_expect_success 'retain authorship' '
 	test_tick &&
 	GIT_AUTHOR_NAME="Twerp Snog" git commit -m "different author" &&
 	git tag twerp &&
-	git rebase -i --onto master HEAD^ &&
+	git rebase -i --onto primary HEAD^ &&
 	git show HEAD | grep "^Author: Twerp Snog"
 '
 
@@ -336,92 +352,16 @@ test_expect_success 'squash' '
 	(
 		set_fake_editor &&
 		FAKE_LINES="1 squash 2" EXPECT_HEADER_COUNT=2 \
-			git rebase -i --onto master HEAD~2
+			git rebase -i --onto primary HEAD~2
 	) &&
 	test B = $(cat file7) &&
-	test_cmp_rev HEAD^ master
+	test_cmp_rev HEAD^ primary
 '
 
 test_expect_success 'retain authorship when squashing' '
 	git show HEAD | grep "^Author: Twerp Snog"
 '
 
-test_expect_success REBASE_P '-p handles "no changes" gracefully' '
-	HEAD=$(git rev-parse HEAD) &&
-	git rebase -i -p HEAD^ &&
-	git update-index --refresh &&
-	git diff-files --quiet &&
-	git diff-index --quiet --cached HEAD -- &&
-	test $HEAD = $(git rev-parse HEAD)
-'
-
-test_expect_failure REBASE_P 'exchange two commits with -p' '
-	git checkout H &&
-	(
-		set_fake_editor &&
-		FAKE_LINES="2 1" git rebase -i -p HEAD~2
-	) &&
-	test H = $(git cat-file commit HEAD^ | sed -ne \$p) &&
-	test G = $(git cat-file commit HEAD | sed -ne \$p)
-'
-
-test_expect_success REBASE_P 'preserve merges with -p' '
-	git checkout -b to-be-preserved master^ &&
-	: > unrelated-file &&
-	git add unrelated-file &&
-	test_tick &&
-	git commit -m "unrelated" &&
-	git checkout -b another-branch master &&
-	echo B > file1 &&
-	test_tick &&
-	git commit -m J file1 &&
-	test_tick &&
-	git merge to-be-preserved &&
-	echo C > file1 &&
-	test_tick &&
-	git commit -m K file1 &&
-	echo D > file1 &&
-	test_tick &&
-	git commit -m L1 file1 &&
-	git checkout HEAD^ &&
-	echo 1 > unrelated-file &&
-	test_tick &&
-	git commit -m L2 unrelated-file &&
-	test_tick &&
-	git merge another-branch &&
-	echo E > file1 &&
-	test_tick &&
-	git commit -m M file1 &&
-	git checkout -b to-be-rebased &&
-	test_tick &&
-	git rebase -i -p --onto branch1 master &&
-	git update-index --refresh &&
-	git diff-files --quiet &&
-	git diff-index --quiet --cached HEAD -- &&
-	test_cmp_rev HEAD~6 branch1 &&
-	test_cmp_rev HEAD~4^2 to-be-preserved &&
-	test_cmp_rev HEAD^^2^ HEAD^^^ &&
-	test $(git show HEAD~5:file1) = B &&
-	test $(git show HEAD~3:file1) = C &&
-	test $(git show HEAD:file1) = E &&
-	test $(git show HEAD:unrelated-file) = 1
-'
-
-test_expect_success REBASE_P 'edit ancestor with -p' '
-	(
-		set_fake_editor &&
-		FAKE_LINES="1 2 edit 3 4" git rebase -i -p HEAD~3
-	) &&
-	echo 2 > unrelated-file &&
-	test_tick &&
-	git commit -m L2-modified --amend unrelated-file &&
-	git rebase --continue &&
-	git update-index --refresh &&
-	git diff-files --quiet &&
-	git diff-index --quiet --cached HEAD -- &&
-	test $(git show HEAD:unrelated-file) = 2
-'
-
 test_expect_success '--continue tries to commit' '
 	git reset --hard D &&
 	test_tick &&
@@ -437,7 +377,7 @@ test_expect_success '--continue tries to commit' '
 '
 
 test_expect_success 'verbose flag is heeded, even after --continue' '
-	git reset --hard master@{1} &&
+	git reset --hard primary@{1} &&
 	test_tick &&
 	test_must_fail git rebase -v -i --onto new-branch1 HEAD^ &&
 	echo resolved > file1 &&
@@ -446,7 +386,7 @@ test_expect_success 'verbose flag is heeded, even after --continue' '
 	grep "^ file1 | 2 +-$" output
 '
 
-test_expect_success C_LOCALE_OUTPUT 'multi-squash only fires up editor once' '
+test_expect_success 'multi-squash only fires up editor once' '
 	base=$(git rev-parse HEAD~4) &&
 	(
 		set_fake_editor &&
@@ -459,7 +399,7 @@ test_expect_success C_LOCALE_OUTPUT 'multi-squash only fires up editor once' '
 	test 1 = $(git show | grep ONCE | wc -l)
 '
 
-test_expect_success C_LOCALE_OUTPUT 'multi-fixup does not fire up editor' '
+test_expect_success 'multi-fixup does not fire up editor' '
 	git checkout -b multi-fixup E &&
 	base=$(git rev-parse HEAD~4) &&
 	(
@@ -510,7 +450,7 @@ test_expect_success 'commit message retained after conflict' '
 	git branch -D conflict-squash
 '
 
-test_expect_success C_LOCALE_OUTPUT 'squash and fixup generate correct log messages' '
+test_expect_success 'squash and fixup generate correct log messages' '
 	cat >expect-squash-fixup <<-\EOF &&
 	B
 
@@ -537,7 +477,7 @@ test_expect_success C_LOCALE_OUTPUT 'squash and fixup generate correct log messa
 	git branch -D squash-fixup
 '
 
-test_expect_success C_LOCALE_OUTPUT 'squash ignores comments' '
+test_expect_success 'squash ignores comments' '
 	git checkout -b skip-comments E &&
 	base=$(git rev-parse HEAD~4) &&
 	(
@@ -553,7 +493,7 @@ test_expect_success C_LOCALE_OUTPUT 'squash ignores comments' '
 	git branch -D skip-comments
 '
 
-test_expect_success C_LOCALE_OUTPUT 'squash ignores blank lines' '
+test_expect_success 'squash ignores blank lines' '
 	git checkout -b skip-blank-lines E &&
 	base=$(git rev-parse HEAD~4) &&
 	(
@@ -676,7 +616,8 @@ test_expect_success 'clean error after failed "exec"' '
 	echo "edited again" > file7 &&
 	git add file7 &&
 	test_must_fail git rebase --continue 2>error &&
-	test_i18ngrep "you have staged changes in your working tree" error
+	test_grep "you have staged changes in your working tree" error &&
+	test_grep ! "could not open.*for reading" error
 '
 
 test_expect_success 'rebase a detached HEAD' '
@@ -691,9 +632,7 @@ test_expect_success 'rebase a detached HEAD' '
 '
 
 test_expect_success 'rebase a commit violating pre-commit' '
-
-	mkdir -p .git/hooks &&
-	write_script .git/hooks/pre-commit <<-\EOF &&
+	test_hook pre-commit <<-\EOF &&
 	test -z "$(git diff --cached --check)"
 	EOF
 	echo "monde! " >> file1 &&
@@ -708,8 +647,6 @@ test_expect_success 'rebase a commit violating pre-commit' '
 '
 
 test_expect_success 'rebase with a file named HEAD in worktree' '
-
-	rm -fr .git/hooks &&
 	git reset --hard &&
 	git checkout -b branch3 A &&
 
@@ -802,7 +739,7 @@ test_expect_success 'rebase -i continue with unstaged submodule' '
 '
 
 test_expect_success 'avoid unnecessary reset' '
-	git checkout master &&
+	git checkout primary &&
 	git reset --hard &&
 	test-tool chmtime =123456789 file3 &&
 	git update-index --refresh &&
@@ -814,14 +751,14 @@ test_expect_success 'avoid unnecessary reset' '
 '
 
 test_expect_success 'reword' '
-	git checkout -b reword-branch master &&
+	git checkout -b reword-branch primary &&
 	(
 		set_fake_editor &&
 		FAKE_LINES="1 2 3 reword 4" FAKE_COMMIT_MESSAGE="E changed" \
 			git rebase -i A &&
 		git show HEAD | grep "E changed" &&
-		test $(git rev-parse master) != $(git rev-parse HEAD) &&
-		test_cmp_rev master^ HEAD^ &&
+		test $(git rev-parse primary) != $(git rev-parse HEAD) &&
+		test_cmp_rev primary^ HEAD^ &&
 		FAKE_LINES="1 2 reword 3 4" FAKE_COMMIT_MESSAGE="D changed" \
 			git rebase -i A &&
 		git show HEAD^ | grep "D changed" &&
@@ -834,6 +771,19 @@ test_expect_success 'reword' '
 	git show HEAD~2 | grep "C changed"
 '
 
+test_expect_success 'no uncommitted changes when rewording and the todo list is reloaded' '
+	git checkout E &&
+	test_when_finished "git checkout @{-1}" &&
+	(
+		set_fake_editor &&
+		GIT_SEQUENCE_EDITOR="\"$PWD/fake-editor.sh\"" &&
+		export GIT_SEQUENCE_EDITOR &&
+		set_reword_editor &&
+		FAKE_LINES="reword 1 reword 2" git rebase -i C
+	) &&
+	check_reworded_commits D E
+'
+
 test_expect_success 'rebase -i can copy notes' '
 	git config notes.rewrite.rebase true &&
 	git config notes.rewriteRef "refs/notes/*" &&
@@ -883,7 +833,7 @@ test_expect_success 'always cherry-pick with --no-ff' '
 	do
 		test ! $(git rev-parse HEAD~$p) = $(git rev-parse original-no-ff-branch~$p) &&
 		git diff HEAD~$p original-no-ff-branch~$p > out &&
-		test_must_be_empty out
+		test_must_be_empty out || return 1
 	done &&
 	test_cmp_rev HEAD~3 original-no-ff-branch~3 &&
 	git diff HEAD~3 original-no-ff-branch~3 > out &&
@@ -918,7 +868,7 @@ test_expect_success 'rebase-i history with funny messages' '
 '
 
 test_expect_success 'prepare for rebase -i --exec' '
-	git checkout master &&
+	git checkout primary &&
 	git checkout -b execute &&
 	test_commit one_exec main.txt one_exec &&
 	test_commit two_exec main.txt two_exec &&
@@ -991,7 +941,7 @@ test_expect_success 'rebase -ix with several instances of --exec' '
 	test_cmp expected actual
 '
 
-test_expect_success C_LOCALE_OUTPUT 'rebase -ix with --autosquash' '
+test_expect_success 'rebase -ix with --autosquash' '
 	git reset --hard execute &&
 	git checkout -b autosquash &&
 	echo second >second.txt &&
@@ -1018,7 +968,7 @@ test_expect_success 'rebase --exec works without -i ' '
 	git reset --hard execute &&
 	rm -rf exec_output &&
 	EDITOR="echo >invoked_editor" git rebase --exec "echo a line >>exec_output"  HEAD~2 2>actual &&
-	test_i18ngrep  "Successfully rebased and updated" actual &&
+	test_grep  "Successfully rebased and updated" actual &&
 	test_line_count = 2 exec_output &&
 	test_path_is_missing invoked_editor
 '
@@ -1026,8 +976,8 @@ test_expect_success 'rebase --exec works without -i ' '
 test_expect_success 'rebase -i --exec without <CMD>' '
 	git reset --hard execute &&
 	test_must_fail git rebase -i --exec 2>actual &&
-	test_i18ngrep "requires a value" actual &&
-	git checkout master
+	test_grep "requires a value" actual &&
+	git checkout primary
 '
 
 test_expect_success 'rebase -i --root re-order and drop commits' '
@@ -1079,7 +1029,7 @@ test_expect_success 'rebase -i --root fixup root commit' '
 
 test_expect_success 'rebase -i --root reword original root commit' '
 	test_when_finished "test_might_fail git rebase --abort" &&
-	git checkout -b reword-original-root-branch master &&
+	git checkout -b reword-original-root-branch primary &&
 	(
 		set_fake_editor &&
 		FAKE_LINES="reword 1 2" FAKE_COMMIT_MESSAGE="A changed" \
@@ -1091,7 +1041,7 @@ test_expect_success 'rebase -i --root reword original root commit' '
 
 test_expect_success 'rebase -i --root reword new root commit' '
 	test_when_finished "test_might_fail git rebase --abort" &&
-	git checkout -b reword-now-root-branch master &&
+	git checkout -b reword-now-root-branch primary &&
 	(
 		set_fake_editor &&
 		FAKE_LINES="reword 3 1" FAKE_COMMIT_MESSAGE="C changed" \
@@ -1132,7 +1082,7 @@ test_expect_success 'rebase -i --root reword root when root has untracked file c
 	test "$(git rev-list --count HEAD)" = 2
 '
 
-test_expect_success C_LOCALE_OUTPUT 'rebase --edit-todo does not work on non-interactive rebase' '
+test_expect_success 'rebase --edit-todo does not work on non-interactive rebase' '
 	git checkout reword-original-root-branch &&
 	git reset --hard &&
 	git checkout conflict-branch &&
@@ -1251,7 +1201,7 @@ test_expect_success 'rebase -i error on commits with \ in message' '
 '
 
 test_expect_success 'short commit ID setup' '
-	test_when_finished "git checkout master" &&
+	test_when_finished "git checkout primary" &&
 	git checkout --orphan collide &&
 	git rm -rf . &&
 	(
@@ -1292,7 +1242,7 @@ test_expect_success 'short commit ID collide' '
 	t3404_collider	sha1:ac4f2ee
 	t3404_collider	sha256:16697
 	EOF
-	test_when_finished "reset_rebase && git checkout master" &&
+	test_when_finished "reset_rebase && git checkout primary" &&
 	git checkout collide &&
 	colliding_id=$(test_oid t3404_collision) &&
 	hexsz=$(test_oid hexsz) &&
@@ -1307,9 +1257,9 @@ test_expect_success 'short commit ID collide' '
 		test $colliding_id = "$(git rev-parse HEAD | cut -c 1-4)" &&
 		grep "^pick $colliding_id " \
 			.git/rebase-merge/git-rebase-todo.tmp &&
-		grep "^pick [0-9a-f]\{$hexsz\}" \
+		grep -E "^pick [0-9a-f]{$hexsz}" \
 			.git/rebase-merge/git-rebase-todo &&
-		grep "^pick [0-9a-f]\{$hexsz\}" \
+		grep -E "^pick [0-9a-f]{$hexsz}" \
 			.git/rebase-merge/git-rebase-todo.backup &&
 		git rebase --continue
 	) &&
@@ -1324,7 +1274,7 @@ test_expect_success 'respect core.abbrev' '
 		set_cat_todo_editor &&
 		test_must_fail git rebase -i HEAD~4 >todo-list
 	) &&
-	test 4 = $(grep -c "pick [0-9a-f]\{12,\}" todo-list)
+	test 4 = $(grep -c -E "pick [0-9a-f]{12,}" todo-list)
 '
 
 test_expect_success 'todo count' '
@@ -1335,24 +1285,38 @@ test_expect_success 'todo count' '
 		test_set_editor "$(pwd)/dump-raw.sh" &&
 		git rebase -i HEAD~4 >actual
 	) &&
-	test_i18ngrep "^# Rebase ..* onto ..* ([0-9]" actual
+	test_grep "^# Rebase ..* onto ..* ([0-9]" actual
 '
 
 test_expect_success 'rebase -i commits that overwrite untracked files (pick)' '
-	git checkout --force branch2 &&
+	git checkout --force A &&
 	git clean -f &&
+	cat >todo <<-EOF &&
+	exec >file2
+	pick $(git rev-parse B) B
+	pick $(git rev-parse C) C
+	pick $(git rev-parse D) D
+	exec cat .git/rebase-merge/done >actual
+	EOF
 	(
-		set_fake_editor &&
-		FAKE_LINES="edit 1 2" git rebase -i A
+		set_replace_editor todo &&
+		test_must_fail git rebase -i A
 	) &&
-	test_cmp_rev HEAD F &&
-	test_path_is_missing file6 &&
-	>file6 &&
-	test_must_fail git rebase --continue &&
-	test_cmp_rev HEAD F &&
-	rm file6 &&
+	test_cmp_rev HEAD B &&
+	test_cmp_rev REBASE_HEAD C &&
+	head -n3 todo >expect &&
+	test_cmp expect .git/rebase-merge/done &&
+	rm file2 &&
+	test_path_is_missing .git/rebase-merge/patch &&
+	echo changed >file1 &&
+	git add file1 &&
+	test_must_fail git rebase --continue 2>err &&
+	grep "error: you have staged changes in your working tree" err &&
+	git reset --hard HEAD &&
 	git rebase --continue &&
-	test_cmp_rev HEAD I
+	test_cmp_rev HEAD D &&
+	tail -n3 todo >>expect &&
+	test_cmp expect actual
 '
 
 test_expect_success 'rebase -i commits that overwrite untracked files (squash)' '
@@ -1368,7 +1332,14 @@ test_expect_success 'rebase -i commits that overwrite untracked files (squash)'
 	>file6 &&
 	test_must_fail git rebase --continue &&
 	test_cmp_rev HEAD F &&
+	test_cmp_rev REBASE_HEAD I &&
 	rm file6 &&
+	test_path_is_missing .git/rebase-merge/patch &&
+	echo changed >file1 &&
+	git add file1 &&
+	test_must_fail git rebase --continue 2>err &&
+	grep "error: you have staged changes in your working tree" err &&
+	git reset --hard HEAD &&
 	git rebase --continue &&
 	test $(git cat-file commit HEAD | sed -ne \$p) = I &&
 	git reset --hard original-branch2
@@ -1386,7 +1357,14 @@ test_expect_success 'rebase -i commits that overwrite untracked files (no ff)' '
 	>file6 &&
 	test_must_fail git rebase --continue &&
 	test $(git cat-file commit HEAD | sed -ne \$p) = F &&
+	test_cmp_rev REBASE_HEAD I &&
 	rm file6 &&
+	test_path_is_missing .git/rebase-merge/patch &&
+	echo changed >file1 &&
+	git add file1 &&
+	test_must_fail git rebase --continue 2>err &&
+	grep "error: you have staged changes in your working tree" err &&
+	git reset --hard HEAD &&
 	git rebase --continue &&
 	test $(git cat-file commit HEAD | sed -ne \$p) = I
 '
@@ -1398,7 +1376,7 @@ test_expect_success 'rebase --continue removes CHERRY_PICK_HEAD' '
 		test_seq 5 | sed "s/$double/&&/" >seq &&
 		git add seq &&
 		test_tick &&
-		git commit -m seq-$double
+		git commit -m seq-$double || return 1
 	done &&
 	git tag seq-onto &&
 	git reset --hard HEAD~2 &&
@@ -1416,11 +1394,11 @@ test_expect_success 'rebase --continue removes CHERRY_PICK_HEAD' '
 
 rebase_setup_and_clean () {
 	test_when_finished "
-		git checkout master &&
+		git checkout primary &&
 		test_might_fail git branch -D $1 &&
 		test_might_fail git rebase --abort
 	" &&
-	git checkout -b $1 ${2:-master}
+	git checkout -b $1 ${2:-primary}
 }
 
 test_expect_success 'drop' '
@@ -1442,7 +1420,7 @@ test_expect_success 'rebase -i respects rebase.missingCommitsCheck = ignore' '
 		FAKE_LINES="1 2 3 4" git rebase -i --root 2>actual
 	) &&
 	test D = $(git cat-file commit HEAD | sed -ne \$p) &&
-	test_i18ngrep \
+	test_grep \
 		"Successfully rebased and updated refs/heads/missing-commit" \
 		actual
 '
@@ -1451,7 +1429,7 @@ test_expect_success 'rebase -i respects rebase.missingCommitsCheck = warn' '
 	cat >expect <<-EOF &&
 	Warning: some commits may have been dropped accidentally.
 	Dropped commits (newer to older):
-	 - $(git rev-list --pretty=oneline --abbrev-commit -1 master)
+	 - $(git rev-list --pretty=oneline --abbrev-commit -1 primary)
 	To avoid this message, use "drop" to explicitly remove a commit.
 	EOF
 	test_config rebase.missingCommitsCheck warn &&
@@ -1461,7 +1439,7 @@ test_expect_success 'rebase -i respects rebase.missingCommitsCheck = warn' '
 		FAKE_LINES="1 2 3 4" git rebase -i --root 2>actual.2
 	) &&
 	head -n4 actual.2 >actual &&
-	test_i18ncmp expect actual &&
+	test_cmp expect actual &&
 	test D = $(git cat-file commit HEAD | sed -ne \$p)
 '
 
@@ -1469,8 +1447,8 @@ test_expect_success 'rebase -i respects rebase.missingCommitsCheck = error' '
 	cat >expect <<-EOF &&
 	Warning: some commits may have been dropped accidentally.
 	Dropped commits (newer to older):
-	 - $(git rev-list --pretty=oneline --abbrev-commit -1 master)
-	 - $(git rev-list --pretty=oneline --abbrev-commit -1 master~2)
+	 - $(git rev-list --pretty=oneline --abbrev-commit -1 primary)
+	 - $(git rev-list --pretty=oneline --abbrev-commit -1 primary~2)
 	To avoid this message, use "drop" to explicitly remove a commit.
 
 	Use '\''git config rebase.missingCommitsCheck'\'' to change the level of warnings.
@@ -1485,7 +1463,7 @@ test_expect_success 'rebase -i respects rebase.missingCommitsCheck = error' '
 		set_fake_editor &&
 		test_must_fail env FAKE_LINES="1 2 4" \
 			git rebase -i --root 2>actual &&
-		test_i18ncmp expect actual &&
+		test_cmp expect actual &&
 		cp .git/rebase-merge/git-rebase-todo.backup \
 			.git/rebase-merge/git-rebase-todo &&
 		FAKE_LINES="1 2 drop 3 4 drop 5" git rebase --edit-todo
@@ -1505,21 +1483,22 @@ test_expect_success 'rebase --edit-todo respects rebase.missingCommitsCheck = ig
 		git rebase --continue 2>actual
 	) &&
 	test D = $(git cat-file commit HEAD | sed -ne \$p) &&
-	test_i18ngrep \
+	test_grep \
 		"Successfully rebased and updated refs/heads/missing-commit" \
 		actual
 '
 
 test_expect_success 'rebase --edit-todo respects rebase.missingCommitsCheck = warn' '
 	cat >expect <<-EOF &&
-	error: invalid line 1: badcmd $(git rev-list --pretty=oneline --abbrev-commit -1 master~4)
+	error: invalid command '\''pickled'\''
+	error: invalid line 1: pickled $(git rev-list --pretty=oneline --abbrev-commit -1 primary~4)
 	Warning: some commits may have been dropped accidentally.
 	Dropped commits (newer to older):
-	 - $(git rev-list --pretty=oneline --abbrev-commit -1 master)
-	 - $(git rev-list --pretty=oneline --abbrev-commit -1 master~4)
+	 - $(git rev-list --pretty=oneline --abbrev-commit -1 primary)
+	 - $(git rev-list --pretty=oneline --abbrev-commit -1 primary~4)
 	To avoid this message, use "drop" to explicitly remove a commit.
 	EOF
-	head -n4 expect >expect.2 &&
+	head -n5 expect >expect.2 &&
 	tail -n1 expect >>expect.2 &&
 	tail -n4 expect.2 >expect.3 &&
 	test_config rebase.missingCommitsCheck warn &&
@@ -1530,27 +1509,28 @@ test_expect_success 'rebase --edit-todo respects rebase.missingCommitsCheck = wa
 			git rebase -i --root &&
 		cp .git/rebase-merge/git-rebase-todo.backup orig &&
 		FAKE_LINES="2 3 4" git rebase --edit-todo 2>actual.2 &&
-		head -n6 actual.2 >actual &&
-		test_i18ncmp expect actual &&
+		head -n7 actual.2 >actual &&
+		test_cmp expect actual &&
 		cp orig .git/rebase-merge/git-rebase-todo &&
 		FAKE_LINES="1 2 3 4" git rebase --edit-todo 2>actual.2 &&
 		head -n4 actual.2 >actual &&
-		test_i18ncmp expect.3 actual &&
+		test_cmp expect.3 actual &&
 		git rebase --continue 2>actual
 	) &&
 	test D = $(git cat-file commit HEAD | sed -ne \$p) &&
-	test_i18ngrep \
+	test_grep \
 		"Successfully rebased and updated refs/heads/missing-commit" \
 		actual
 '
 
 test_expect_success 'rebase --edit-todo respects rebase.missingCommitsCheck = error' '
 	cat >expect <<-EOF &&
-	error: invalid line 1: badcmd $(git rev-list --pretty=oneline --abbrev-commit -1 master~4)
+	error: invalid command '\''pickled'\''
+	error: invalid line 1: pickled $(git rev-list --pretty=oneline --abbrev-commit -1 primary~4)
 	Warning: some commits may have been dropped accidentally.
 	Dropped commits (newer to older):
-	 - $(git rev-list --pretty=oneline --abbrev-commit -1 master)
-	 - $(git rev-list --pretty=oneline --abbrev-commit -1 master~4)
+	 - $(git rev-list --pretty=oneline --abbrev-commit -1 primary)
+	 - $(git rev-list --pretty=oneline --abbrev-commit -1 primary~4)
 	To avoid this message, use "drop" to explicitly remove a commit.
 
 	Use '\''git config rebase.missingCommitsCheck'\'' to change the level of warnings.
@@ -1571,22 +1551,22 @@ test_expect_success 'rebase --edit-todo respects rebase.missingCommitsCheck = er
 		cp .git/rebase-merge/git-rebase-todo.backup orig &&
 		test_must_fail env FAKE_LINES="2 3 4" \
 			git rebase --edit-todo 2>actual &&
-		test_i18ncmp expect actual &&
+		test_cmp expect actual &&
 		test_must_fail git rebase --continue 2>actual &&
-		test_i18ncmp expect.2 actual &&
+		test_cmp expect.2 actual &&
 		test_must_fail git rebase --edit-todo &&
 		cp orig .git/rebase-merge/git-rebase-todo &&
 		test_must_fail env FAKE_LINES="1 2 3 4" \
 			git rebase --edit-todo 2>actual &&
-		test_i18ncmp expect.3 actual &&
+		test_cmp expect.3 actual &&
 		test_must_fail git rebase --continue 2>actual &&
-		test_i18ncmp expect.3 actual &&
+		test_cmp expect.3 actual &&
 		cp orig .git/rebase-merge/git-rebase-todo &&
 		FAKE_LINES="1 2 3 4 drop 5" git rebase --edit-todo &&
 		git rebase --continue 2>actual
 	) &&
 	test D = $(git cat-file commit HEAD | sed -ne \$p) &&
-	test_i18ngrep \
+	test_grep \
 		"Successfully rebased and updated refs/heads/missing-commit" \
 		actual
 '
@@ -1635,7 +1615,7 @@ test_expect_success 'respects rebase.abbreviateCommands with fixup, squash and e
 	(
 		set_cat_todo_editor &&
 		test_must_fail git rebase -i --exec "git show HEAD" \
-			--autosquash master >actual
+			--autosquash primary >actual
 	) &&
 	test_cmp expected actual
 '
@@ -1646,9 +1626,9 @@ test_expect_success 'static check of bad command' '
 		set_fake_editor &&
 		test_must_fail env FAKE_LINES="1 2 3 bad 4 5" \
 		git rebase -i --root 2>actual &&
-		test_i18ngrep "badcmd $(git rev-list --oneline -1 master~1)" \
+		test_grep "pickled $(git rev-list --oneline -1 primary~1)" \
 				actual &&
-		test_i18ngrep "You can fix this with .git rebase --edit-todo.." \
+		test_grep "You can fix this with .git rebase --edit-todo.." \
 				actual &&
 		FAKE_LINES="1 2 3 drop 4 5" git rebase --edit-todo
 	) &&
@@ -1657,6 +1637,32 @@ test_expect_success 'static check of bad command' '
 	test C = $(git cat-file commit HEAD^ | sed -ne \$p)
 '
 
+test_expect_success 'the first command cannot be a fixup' '
+	rebase_setup_and_clean fixup-first &&
+
+	cat >orig <<-EOF &&
+	fixup $(git log -1 --format="%h %s" B)
+	pick $(git log -1 --format="%h %s" C)
+	EOF
+
+	(
+		set_replace_editor orig &&
+		test_must_fail git rebase -i A 2>actual
+	) &&
+	grep "cannot .fixup. without a previous commit" actual &&
+	grep "You can fix this with .git rebase --edit-todo.." actual &&
+	# verify that the todo list has not been truncated
+	grep -v "^#" .git/rebase-merge/git-rebase-todo >actual &&
+	test_cmp orig actual &&
+
+	test_must_fail git rebase --edit-todo 2>actual &&
+	grep "cannot .fixup. without a previous commit" actual &&
+	grep "You can fix this with .git rebase --edit-todo.." actual &&
+	# verify that the todo list has not been truncated
+	grep -v "^#" .git/rebase-merge/git-rebase-todo >actual &&
+	test_cmp orig actual
+'
+
 test_expect_success 'tabs and spaces are accepted in the todolist' '
 	rebase_setup_and_clean indented-comment &&
 	write_script add-indent.sh <<-\EOF &&
@@ -1680,8 +1686,8 @@ test_expect_success 'static check of bad SHA-1' '
 		set_fake_editor &&
 		test_must_fail env FAKE_LINES="1 2 edit fakesha 3 4 5 #" \
 			git rebase -i --root 2>actual &&
-			test_i18ngrep "edit XXXXXXX False commit" actual &&
-			test_i18ngrep "You can fix this with .git rebase --edit-todo.." \
+			test_grep "edit XXXXXXX False commit" actual &&
+			test_grep "You can fix this with .git rebase --edit-todo.." \
 					actual &&
 		FAKE_LINES="1 2 4 5 6" git rebase --edit-todo
 	) &&
@@ -1708,7 +1714,7 @@ test_expect_success 'rebase -i --gpg-sign=<key-id>' '
 		FAKE_LINES="edit 1" git rebase -i --gpg-sign="\"S I Gner\"" \
 			HEAD^ >out 2>err
 	) &&
-	test_i18ngrep "$SQ-S\"S I Gner\"$SQ" err
+	test_grep "$SQ-S\"S I Gner\"$SQ" err
 '
 
 test_expect_success 'rebase -i --gpg-sign=<key-id> overrides commit.gpgSign' '
@@ -1719,7 +1725,7 @@ test_expect_success 'rebase -i --gpg-sign=<key-id> overrides commit.gpgSign' '
 		FAKE_LINES="edit 1" git rebase -i --gpg-sign="\"S I Gner\"" \
 			HEAD^ >out 2>err
 	) &&
-	test_i18ngrep "$SQ-S\"S I Gner\"$SQ" err
+	test_grep "$SQ-S\"S I Gner\"$SQ" err
 '
 
 test_expect_success 'valid author header after --root swap' '
@@ -1747,10 +1753,8 @@ test_expect_success 'valid author header when author contains single quote' '
 '
 
 test_expect_success 'post-commit hook is called' '
-	test_when_finished "rm -f .git/hooks/post-commit" &&
 	>actual &&
-	mkdir -p .git/hooks &&
-	write_script .git/hooks/post-commit <<-\EOS &&
+	test_hook post-commit <<-\EOS &&
 	git rev-parse HEAD >>actual
 	EOS
 	(
@@ -1775,7 +1779,7 @@ test_expect_success 'correct error message for partial commit after empty pick'
 	) &&
 	echo x >file1 &&
 	test_must_fail git commit file1 2>err &&
-	test_i18ngrep "cannot do a partial commit during a rebase." err
+	test_grep "cannot do a partial commit during a rebase." err
 '
 
 test_expect_success 'correct error message for commit --amend after empty pick' '
@@ -1788,7 +1792,427 @@ test_expect_success 'correct error message for commit --amend after empty pick'
 	) &&
 	echo x>file1 &&
 	test_must_fail git commit -a --amend 2>err &&
-	test_i18ngrep "middle of a rebase -- cannot amend." err
+	test_grep "middle of a rebase -- cannot amend." err
+'
+
+test_expect_success 'todo has correct onto hash' '
+	GIT_SEQUENCE_EDITOR=cat git rebase -i no-conflict-branch~4 no-conflict-branch >actual &&
+	onto=$(git rev-parse --short HEAD~4) &&
+	test_grep "^# Rebase ..* onto $onto" actual
+'
+
+test_expect_success 'ORIG_HEAD is updated correctly' '
+	test_when_finished "git checkout primary && git branch -D test-orig-head" &&
+	git checkout -b test-orig-head A &&
+	git commit --allow-empty -m A1 &&
+	git commit --allow-empty -m A2 &&
+	git commit --allow-empty -m A3 &&
+	git commit --allow-empty -m A4 &&
+	git rebase primary &&
+	test_cmp_rev ORIG_HEAD test-orig-head@{1}
+'
+
+test_expect_success '--update-refs adds label and update-ref commands' '
+	git checkout -b update-refs no-conflict-branch &&
+	git branch -f base HEAD~4 &&
+	git branch -f first HEAD~3 &&
+	git branch -f second HEAD~3 &&
+	git branch -f third HEAD~1 &&
+	git commit --allow-empty --fixup=third &&
+	git branch -f is-not-reordered &&
+	git commit --allow-empty --fixup=HEAD~4 &&
+	git branch -f shared-tip &&
+	(
+		set_cat_todo_editor &&
+
+		cat >expect <<-EOF &&
+		pick $(git log -1 --format=%h J) J
+		fixup $(git log -1 --format=%h update-refs) fixup! J # empty
+		update-ref refs/heads/second
+		update-ref refs/heads/first
+		pick $(git log -1 --format=%h K) K
+		pick $(git log -1 --format=%h L) L
+		fixup $(git log -1 --format=%h is-not-reordered) fixup! L # empty
+		update-ref refs/heads/third
+		pick $(git log -1 --format=%h M) M
+		update-ref refs/heads/no-conflict-branch
+		update-ref refs/heads/is-not-reordered
+		update-ref refs/heads/shared-tip
+		EOF
+
+		test_must_fail git rebase -i --autosquash --update-refs primary >todo &&
+		test_cmp expect todo &&
+
+		test_must_fail git -c rebase.autosquash=true \
+				   -c rebase.updaterefs=true \
+				   rebase -i primary >todo &&
+
+		test_cmp expect todo
+	)
+'
+
+test_expect_success '--update-refs adds commands with --rebase-merges' '
+	git checkout -b update-refs-with-merge no-conflict-branch &&
+	git branch -f base HEAD~4 &&
+	git branch -f first HEAD~3 &&
+	git branch -f second HEAD~3 &&
+	git branch -f third HEAD~1 &&
+	git merge -m merge branch2 &&
+	git branch -f merge-branch &&
+	git commit --fixup=third --allow-empty &&
+	(
+		set_cat_todo_editor &&
+
+		cat >expect <<-EOF &&
+		label onto
+		reset onto
+		pick $(git log -1 --format=%h branch2~1) F
+		pick $(git log -1 --format=%h branch2) I
+		update-ref refs/heads/branch2
+		label merge
+		reset onto
+		pick $(git log -1 --format=%h refs/heads/second) J
+		update-ref refs/heads/second
+		update-ref refs/heads/first
+		pick $(git log -1 --format=%h refs/heads/third~1) K
+		pick $(git log -1 --format=%h refs/heads/third) L
+		fixup $(git log -1 --format=%h update-refs-with-merge) fixup! L # empty
+		update-ref refs/heads/third
+		pick $(git log -1 --format=%h HEAD~2) M
+		update-ref refs/heads/no-conflict-branch
+		merge -C $(git log -1 --format=%h HEAD~1) merge # merge
+		update-ref refs/heads/merge-branch
+		EOF
+
+		test_must_fail git rebase -i --autosquash \
+				   --rebase-merges=rebase-cousins \
+				   --update-refs primary >todo &&
+
+		test_cmp expect todo &&
+
+		test_must_fail git -c rebase.autosquash=true \
+				   -c rebase.updaterefs=true \
+				   rebase -i \
+				   --rebase-merges=rebase-cousins \
+				   primary >todo &&
+
+		test_cmp expect todo
+	)
+'
+
+test_expect_success '--update-refs updates refs correctly' '
+	git checkout -B update-refs no-conflict-branch &&
+	git branch -f base HEAD~4 &&
+	git branch -f first HEAD~3 &&
+	git branch -f second HEAD~3 &&
+	git branch -f third HEAD~1 &&
+	test_commit extra2 fileX &&
+	git commit --amend --fixup=L &&
+
+	git rebase -i --autosquash --update-refs primary 2>err &&
+
+	test_cmp_rev HEAD~3 refs/heads/first &&
+	test_cmp_rev HEAD~3 refs/heads/second &&
+	test_cmp_rev HEAD~1 refs/heads/third &&
+	test_cmp_rev HEAD refs/heads/no-conflict-branch &&
+
+	cat >expect <<-\EOF &&
+	Successfully rebased and updated refs/heads/update-refs.
+	Updated the following refs with --update-refs:
+		refs/heads/first
+		refs/heads/no-conflict-branch
+		refs/heads/second
+		refs/heads/third
+	EOF
+
+	# Clear "Rebasing (X/Y)" progress lines and drop leading tabs.
+	sed -e "s/Rebasing.*Successfully/Successfully/g" -e "s/^\t//g" \
+		<err >err.trimmed &&
+	test_cmp expect err.trimmed
+'
+
+test_expect_success 'respect user edits to update-ref steps' '
+	git checkout -B update-refs-break no-conflict-branch &&
+	git branch -f base HEAD~4 &&
+	git branch -f first HEAD~3 &&
+	git branch -f second HEAD~3 &&
+	git branch -f third HEAD~1 &&
+	git branch -f unseen base &&
+
+	# First, we will add breaks to the expected todo file
+	cat >fake-todo-1 <<-EOF &&
+	pick $(git rev-parse HEAD~3)
+	break
+	update-ref refs/heads/second
+	update-ref refs/heads/first
+
+	pick $(git rev-parse HEAD~2)
+	pick $(git rev-parse HEAD~1)
+	update-ref refs/heads/third
+
+	pick $(git rev-parse HEAD)
+	update-ref refs/heads/no-conflict-branch
+	EOF
+
+	# Second, we will drop some update-refs commands (and move one)
+	cat >fake-todo-2 <<-EOF &&
+	update-ref refs/heads/second
+
+	pick $(git rev-parse HEAD~2)
+	update-ref refs/heads/third
+	pick $(git rev-parse HEAD~1)
+	break
+
+	pick $(git rev-parse HEAD)
+	EOF
+
+	# Third, we will:
+	# * insert a new one (new-branch),
+	# * re-add an old one (first), and
+	# * add a second instance of a previously-stored one (second)
+	cat >fake-todo-3 <<-EOF &&
+	update-ref refs/heads/unseen
+	update-ref refs/heads/new-branch
+	pick $(git rev-parse HEAD)
+	update-ref refs/heads/first
+	update-ref refs/heads/second
+	EOF
+
+	(
+		set_replace_editor fake-todo-1 &&
+		git rebase -i --update-refs primary &&
+
+		# These branches are currently locked.
+		for b in first second third no-conflict-branch
+		do
+			test_must_fail git branch -f $b base || return 1
+		done &&
+
+		set_replace_editor fake-todo-2 &&
+		git rebase --edit-todo &&
+
+		# These branches are currently locked.
+		for b in second third
+		do
+			test_must_fail git branch -f $b base || return 1
+		done &&
+
+		# These branches are currently unlocked for checkout.
+		for b in first no-conflict-branch
+		do
+			git worktree add wt-$b $b &&
+			git worktree remove wt-$b || return 1
+		done &&
+
+		git rebase --continue &&
+
+		set_replace_editor fake-todo-3 &&
+		git rebase --edit-todo &&
+
+		# These branches are currently locked.
+		for b in second third first unseen
+		do
+			test_must_fail git branch -f $b base || return 1
+		done &&
+
+		# These branches are currently unlocked for checkout.
+		for b in no-conflict-branch
+		do
+			git worktree add wt-$b $b &&
+			git worktree remove wt-$b || return 1
+		done &&
+
+		git rebase --continue
+	) &&
+
+	test_cmp_rev HEAD~2 refs/heads/third &&
+	test_cmp_rev HEAD~1 refs/heads/unseen &&
+	test_cmp_rev HEAD~1 refs/heads/new-branch &&
+	test_cmp_rev HEAD refs/heads/first &&
+	test_cmp_rev HEAD refs/heads/second &&
+	test_cmp_rev HEAD refs/heads/no-conflict-branch
+'
+
+test_expect_success '--update-refs: all update-ref lines removed' '
+	git checkout -b test-refs-not-removed no-conflict-branch &&
+	git branch -f base HEAD~4 &&
+	git branch -f first HEAD~3 &&
+	git branch -f second HEAD~3 &&
+	git branch -f third HEAD~1 &&
+	git branch -f tip &&
+
+	test_commit test-refs-not-removed &&
+	git commit --amend --fixup first &&
+
+	git rev-parse first second third tip no-conflict-branch >expect-oids &&
+
+	(
+		set_cat_todo_editor &&
+		test_must_fail git rebase -i --update-refs base >todo.raw &&
+		sed -e "/^update-ref/d" <todo.raw >todo
+	) &&
+	(
+		set_replace_editor todo &&
+		git rebase -i --update-refs base
+	) &&
+
+	# Ensure refs are not deleted and their OIDs have not changed
+	git rev-parse first second third tip no-conflict-branch >actual-oids &&
+	test_cmp expect-oids actual-oids
+'
+
+test_expect_success '--update-refs: all update-ref lines removed, then some re-added' '
+	git checkout -b test-refs-not-removed2 no-conflict-branch &&
+	git branch -f base HEAD~4 &&
+	git branch -f first HEAD~3 &&
+	git branch -f second HEAD~3 &&
+	git branch -f third HEAD~1 &&
+	git branch -f tip &&
+
+	test_commit test-refs-not-removed2 &&
+	git commit --amend --fixup first &&
+
+	git rev-parse first second third >expect-oids &&
+
+	(
+		set_cat_todo_editor &&
+		test_must_fail git rebase -i \
+			--autosquash --update-refs \
+			base >todo.raw &&
+		sed -e "/^update-ref/d" <todo.raw >todo
+	) &&
+
+	# Add a break to the end of the todo so we can edit later
+	echo "break" >>todo &&
+
+	(
+		set_replace_editor todo &&
+		git rebase -i --autosquash --update-refs base &&
+		echo "update-ref refs/heads/tip" >todo &&
+		git rebase --edit-todo &&
+		git rebase --continue
+	) &&
+
+	# Ensure first/second/third are unchanged, but tip is updated
+	git rev-parse first second third >actual-oids &&
+	test_cmp expect-oids actual-oids &&
+	test_cmp_rev HEAD tip
+'
+
+test_expect_success '--update-refs: --edit-todo with no update-ref lines' '
+	git checkout -b test-refs-not-removed3 no-conflict-branch &&
+	git branch -f base HEAD~4 &&
+	git branch -f first HEAD~3 &&
+	git branch -f second HEAD~3 &&
+	git branch -f third HEAD~1 &&
+	git branch -f tip &&
+
+	test_commit test-refs-not-removed3 &&
+	git commit --amend --fixup first &&
+
+	git rev-parse first second third tip no-conflict-branch >expect-oids &&
+
+	(
+		set_cat_todo_editor &&
+		test_must_fail git rebase -i \
+			--autosquash --update-refs \
+			base >todo.raw &&
+		sed -e "/^update-ref/d" <todo.raw >todo
+	) &&
+
+	# Add a break to the beginning of the todo so we can resume with no
+	# update-ref lines
+	echo "break" >todo.new &&
+	cat todo >>todo.new &&
+
+	(
+		set_replace_editor todo.new &&
+		git rebase -i --autosquash --update-refs base &&
+
+		# Make no changes when editing so update-refs is still empty
+		cat todo >todo.new &&
+		git rebase --edit-todo &&
+		git rebase --continue
+	) &&
+
+	# Ensure refs are not deleted and their OIDs have not changed
+	git rev-parse first second third tip no-conflict-branch >actual-oids &&
+	test_cmp expect-oids actual-oids
+'
+
+test_expect_success '--update-refs: check failed ref update' '
+	test_when_finished "test_might_fail git rebase --abort" &&
+	git checkout -B update-refs-error no-conflict-branch &&
+	git branch -f base HEAD~4 &&
+	git branch -f first HEAD~3 &&
+	git branch -f second HEAD~2 &&
+	git branch -f third HEAD~1 &&
+
+	cat >fake-todo <<-EOF &&
+	pick $(git rev-parse HEAD~3)
+	break
+	update-ref refs/heads/first
+
+	pick $(git rev-parse HEAD~2)
+	update-ref refs/heads/second
+
+	pick $(git rev-parse HEAD~1)
+	update-ref refs/heads/third
+
+	pick $(git rev-parse HEAD)
+	update-ref refs/heads/no-conflict-branch
+	EOF
+
+	(
+		set_replace_editor fake-todo &&
+		git rebase -i --update-refs base
+	) &&
+
+	# At this point, the values of first, second, and third are
+	# recorded in the update-refs file. We will force-update the
+	# "second" ref, but "git branch -f" will not work because of
+	# the lock in the update-refs file.
+	git update-ref refs/heads/second third &&
+
+	test_must_fail git rebase --continue 2>err &&
+	grep "update_ref failed for ref '\''refs/heads/second'\''" err &&
+
+	cat >expect <<-\EOF &&
+	Updated the following refs with --update-refs:
+		refs/heads/first
+		refs/heads/no-conflict-branch
+		refs/heads/third
+	Failed to update the following refs with --update-refs:
+		refs/heads/second
+	EOF
+
+	# Clear "Rebasing (X/Y)" progress lines and drop leading tabs.
+	tail -n 6 err >err.last &&
+	sed -e "s/Rebasing.*Successfully/Successfully/g" -e "s/^\t//g" \
+		<err.last >err.trimmed &&
+	test_cmp expect err.trimmed
+'
+
+test_expect_success 'bad labels and refs rejected when parsing todo list' '
+	test_when_finished "test_might_fail git rebase --abort" &&
+	cat >todo <<-\EOF &&
+	exec >execed
+	label #
+	label :invalid
+	update-ref :bad
+	update-ref topic
+	EOF
+	rm -f execed &&
+	(
+		set_replace_editor todo &&
+		test_must_fail git rebase -i HEAD 2>err
+	) &&
+	grep "'\''#'\'' is not a valid label" err &&
+	grep "'\'':invalid'\'' is not a valid label" err &&
+	grep "'\'':bad'\'' is not a valid refname" err &&
+	grep "update-ref requires a fully qualified refname e.g. refs/heads/topic" \
+		err &&
+	test_path_is_missing execed
 '
 
 # This must be the last test in this file
diff --git a/t/t3405-rebase-malformed.sh b/t/t3405-rebase-malformed.sh
index 860e63e..8979bc3 100755
--- a/t/t3405-rebase-malformed.sh
+++ b/t/t3405-rebase-malformed.sh
@@ -2,6 +2,10 @@
 
 test_description='rebase should handle arbitrary git message'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-rebase.sh
 
@@ -52,7 +56,7 @@ test_expect_success setup '
 	git add file3 &&
 	git commit --allow-empty-message -m "" &&
 
-	git checkout master &&
+	git checkout main &&
 
 	echo One >file1 &&
 	test_tick &&
@@ -62,7 +66,7 @@ test_expect_success setup '
 
 test_expect_success 'rebase commit with multi-line subject' '
 
-	git rebase master multi-line-subject &&
+	git rebase main multi-line-subject &&
 	git cat-file commit HEAD | sed -e "1,/^\$/d" >F1 &&
 
 	test_cmp F0 F1 &&
@@ -70,14 +74,14 @@ test_expect_success 'rebase commit with multi-line subject' '
 '
 
 test_expect_success 'rebase commit with diff in message' '
-	git rebase master diff-in-message &&
+	git rebase main diff-in-message &&
 	git cat-file commit HEAD | sed -e "1,/^$/d" >G1 &&
 	test_cmp G0 G1 &&
 	test_cmp G G0
 '
 
 test_expect_success 'rebase -m commit with empty message' '
-	git rebase -m master empty-message-merge
+	git rebase -m main empty-message-merge
 '
 
 test_expect_success 'rebase -i commit with empty message' '
diff --git a/t/t3406-rebase-message.sh b/t/t3406-rebase-message.sh
index 927a4f4..a1d7fa7 100755
--- a/t/t3406-rebase-message.sh
+++ b/t/t3406-rebase-message.sh
@@ -2,15 +2,24 @@
 
 test_description='messages from rebase operation'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 test_expect_success 'setup' '
 	test_commit O fileO &&
 	test_commit X fileX &&
+	git branch fast-forward &&
 	test_commit A fileA &&
 	test_commit B fileB &&
 	test_commit Y fileY &&
 
+	git checkout -b conflicts O &&
+	test_commit P &&
+	test_commit conflict-X fileX &&
+	test_commit Q &&
+
 	git checkout -b topic O &&
 	git cherry-pick A B &&
 	test_commit Z fileZ &&
@@ -18,105 +27,232 @@ test_expect_success 'setup' '
 '
 
 test_expect_success 'rebase -m' '
-	git rebase -m master >actual &&
+	git rebase -m main >actual &&
 	test_must_be_empty actual
 '
 
-test_expect_success 'rebase against master twice' '
-	git rebase --apply master >out &&
-	test_i18ngrep "Current branch topic is up to date" out
+test_expect_success 'rebase against main twice' '
+	git rebase --apply main >out &&
+	test_grep "Current branch topic is up to date" out
 '
 
-test_expect_success 'rebase against master twice with --force' '
-	git rebase --force-rebase --apply master >out &&
-	test_i18ngrep "Current branch topic is up to date, rebase forced" out
+test_expect_success 'rebase against main twice with --force' '
+	git rebase --force-rebase --apply main >out &&
+	test_grep "Current branch topic is up to date, rebase forced" out
 '
 
-test_expect_success 'rebase against master twice from another branch' '
+test_expect_success 'rebase against main twice from another branch' '
 	git checkout topic^ &&
-	git rebase --apply master topic >out &&
-	test_i18ngrep "Current branch topic is up to date" out
+	git rebase --apply main topic >out &&
+	test_grep "Current branch topic is up to date" out
 '
 
-test_expect_success 'rebase fast-forward to master' '
+test_expect_success 'rebase fast-forward to main' '
 	git checkout topic^ &&
 	git rebase --apply topic >out &&
-	test_i18ngrep "Fast-forwarded HEAD to topic" out
+	test_grep "Fast-forwarded HEAD to topic" out
 '
 
 test_expect_success 'rebase --stat' '
 	git reset --hard start &&
-        git rebase --stat master >diffstat.txt &&
-        grep "^ fileX |  *1 +$" diffstat.txt
+	git rebase --stat main >diffstat.txt &&
+	grep "^ fileX |  *1 +$" diffstat.txt
 '
 
 test_expect_success 'rebase w/config rebase.stat' '
 	git reset --hard start &&
-        git config rebase.stat true &&
-        git rebase master >diffstat.txt &&
-        grep "^ fileX |  *1 +$" diffstat.txt
+	git config rebase.stat true &&
+	git rebase main >diffstat.txt &&
+	grep "^ fileX |  *1 +$" diffstat.txt
 '
 
 test_expect_success 'rebase -n overrides config rebase.stat config' '
 	git reset --hard start &&
-        git config rebase.stat true &&
-        git rebase -n master >diffstat.txt &&
-        ! grep "^ fileX |  *1 +$" diffstat.txt
+	git config rebase.stat true &&
+	git rebase -n main >diffstat.txt &&
+	! grep "^ fileX |  *1 +$" diffstat.txt
 '
 
-# Output to stderr:
-#
-#     "Does not point to a valid commit: invalid-ref"
-#
-# NEEDSWORK: This "grep" is fine in real non-C locales, but
-# GIT_TEST_GETTEXT_POISON poisons the refname along with the enclosing
-# error message.
 test_expect_success 'rebase --onto outputs the invalid ref' '
 	test_must_fail git rebase --onto invalid-ref HEAD HEAD 2>err &&
-	test_i18ngrep "invalid-ref" err
+	test_grep "invalid-ref" err
 '
 
 test_expect_success 'error out early upon -C<n> or --whitespace=<bad>' '
 	test_must_fail git rebase -Cnot-a-number HEAD 2>err &&
-	test_i18ngrep "numerical value" err &&
+	test_grep "numerical value" err &&
 	test_must_fail git rebase --whitespace=bad HEAD 2>err &&
-	test_i18ngrep "Invalid whitespace option" err
+	test_grep "Invalid whitespace option" err
 '
 
-test_expect_success 'GIT_REFLOG_ACTION' '
-	git checkout start &&
-	test_commit reflog-onto &&
-	git checkout -b reflog-topic start &&
-	test_commit reflog-to-rebase &&
+write_reflog_expect () {
+	if test $mode = --apply
+	then
+		sed 's/(continue)/(pick)/'
+	else
+		cat
+	fi >expect
+}
+
+test_reflog () {
+	mode=$1
+	reflog_action="$2"
+
+	test_expect_success "rebase $mode reflog${reflog_action:+ GIT_REFLOG_ACTION=$reflog_action}" '
+	git checkout conflicts &&
+	test_when_finished "git reset --hard Q" &&
+
+	(
+		if test -n "$reflog_action"
+		then
+			GIT_REFLOG_ACTION="$reflog_action" &&
+			export GIT_REFLOG_ACTION
+		fi &&
+		test_must_fail git rebase $mode main &&
+		echo resolved >fileX &&
+		git add fileX &&
+		git rebase --continue
+	) &&
+
+	git log -g --format=%gs -5 >actual &&
+	write_reflog_expect <<-EOF &&
+	${reflog_action:-rebase} (finish): returning to refs/heads/conflicts
+	${reflog_action:-rebase} (pick): Q
+	${reflog_action:-rebase} (continue): conflict-X
+	${reflog_action:-rebase} (pick): P
+	${reflog_action:-rebase} (start): checkout main
+	EOF
+	test_cmp expect actual &&
+
+	git log -g --format=%gs -1 conflicts >actual &&
+	write_reflog_expect <<-EOF &&
+	${reflog_action:-rebase} (finish): refs/heads/conflicts onto $(git rev-parse main)
+	EOF
+	test_cmp expect actual &&
+
+	# check there is only one new entry in the branch reflog
+	test_cmp_rev conflicts@{1} Q
+	'
+
+	test_expect_success "rebase $mode fast-forward reflog${reflog_action:+ GIT_REFLOG_ACTION=$reflog_action}" '
+	git checkout fast-forward &&
+	test_when_finished "git reset --hard X" &&
+
+	(
+		if test -n "$reflog_action"
+		then
+			GIT_REFLOG_ACTION="$reflog_action" &&
+			export GIT_REFLOG_ACTION
+		fi &&
+		git rebase $mode main
+	) &&
+
+	git log -g --format=%gs -2 >actual &&
+	write_reflog_expect <<-EOF &&
+	${reflog_action:-rebase} (finish): returning to refs/heads/fast-forward
+	${reflog_action:-rebase} (start): checkout main
+	EOF
+	test_cmp expect actual &&
+
+	git log -g --format=%gs -1 fast-forward >actual &&
+	write_reflog_expect <<-EOF &&
+	${reflog_action:-rebase} (finish): refs/heads/fast-forward onto $(git rev-parse main)
+	EOF
+	test_cmp expect actual &&
+
+	# check there is only one new entry in the branch reflog
+	test_cmp_rev fast-forward@{1} X
+	'
+
+	test_expect_success "rebase $mode --skip reflog${reflog_action:+ GIT_REFLOG_ACTION=$reflog_action}" '
+	git checkout conflicts &&
+	test_when_finished "git reset --hard Q" &&
+
+	(
+		if test -n "$reflog_action"
+		then
+			GIT_REFLOG_ACTION="$reflog_action" &&
+			export GIT_REFLOG_ACTION
+		fi &&
+		test_must_fail git rebase $mode main &&
+		git rebase --skip
+	) &&
+
+	git log -g --format=%gs -4 >actual &&
+	write_reflog_expect <<-EOF &&
+	${reflog_action:-rebase} (finish): returning to refs/heads/conflicts
+	${reflog_action:-rebase} (pick): Q
+	${reflog_action:-rebase} (pick): P
+	${reflog_action:-rebase} (start): checkout main
+	EOF
+	test_cmp expect actual
+	'
+
+	test_expect_success "rebase $mode --abort reflog${reflog_action:+ GIT_REFLOG_ACTION=$reflog_action}" '
+	git checkout conflicts &&
+	test_when_finished "git reset --hard Q" &&
+
+	git log -g -1 conflicts >branch-expect &&
+	(
+		if test -n "$reflog_action"
+		then
+			GIT_REFLOG_ACTION="$reflog_action" &&
+			export GIT_REFLOG_ACTION
+		fi &&
+		test_must_fail git rebase $mode main &&
+		git rebase --abort
+	) &&
 
-	git rebase reflog-onto &&
 	git log -g --format=%gs -3 >actual &&
-	cat >expect <<-\EOF &&
-	rebase (finish): returning to refs/heads/reflog-topic
-	rebase (pick): reflog-to-rebase
-	rebase (start): checkout reflog-onto
+	write_reflog_expect <<-EOF &&
+	${reflog_action:-rebase} (abort): returning to refs/heads/conflicts
+	${reflog_action:-rebase} (pick): P
+	${reflog_action:-rebase} (start): checkout main
 	EOF
 	test_cmp expect actual &&
 
-	git checkout -b reflog-prefix reflog-to-rebase &&
-	GIT_REFLOG_ACTION=change-the-reflog git rebase reflog-onto &&
+	# check branch reflog is unchanged
+	git log -g -1 conflicts >branch-actual &&
+	test_cmp branch-expect branch-actual
+	'
+
+	test_expect_success "rebase $mode --abort detached HEAD reflog${reflog_action:+ GIT_REFLOG_ACTION=$reflog_action}" '
+	git checkout Q &&
+	test_when_finished "git reset --hard Q" &&
+
+	(
+		if test -n "$reflog_action"
+		then
+			GIT_REFLOG_ACTION="$reflog_action" &&
+			export GIT_REFLOG_ACTION
+		fi &&
+		test_must_fail git rebase $mode main &&
+		git rebase --abort
+	) &&
+
 	git log -g --format=%gs -3 >actual &&
-	cat >expect <<-\EOF &&
-	change-the-reflog (finish): returning to refs/heads/reflog-prefix
-	change-the-reflog (pick): reflog-to-rebase
-	change-the-reflog (start): checkout reflog-onto
+	write_reflog_expect <<-EOF &&
+	${reflog_action:-rebase} (abort): returning to $(git rev-parse Q)
+	${reflog_action:-rebase} (pick): P
+	${reflog_action:-rebase} (start): checkout main
 	EOF
 	test_cmp expect actual
-'
+	'
+}
+
+test_reflog --merge
+test_reflog --merge my-reflog-action
+test_reflog --apply
+test_reflog --apply my-reflog-action
 
 test_expect_success 'rebase -i onto unrelated history' '
 	git init unrelated &&
 	test_commit -C unrelated 1 &&
 	git -C unrelated remote add -f origin "$PWD" &&
-	git -C unrelated branch --set-upstream-to=origin/master &&
+	git -C unrelated branch --set-upstream-to=origin/main &&
 	git -C unrelated -c core.editor=true rebase -i -v --stat >actual &&
-	test_i18ngrep "Changes to " actual &&
-	test_i18ngrep "5 files changed" actual
+	test_grep "Changes to " actual &&
+	test_grep "5 files changed" actual
 '
 
 test_done
diff --git a/t/t3407-rebase-abort.sh b/t/t3407-rebase-abort.sh
index 97efea0..9f49c42 100755
--- a/t/t3407-rebase-abort.sh
+++ b/t/t3407-rebase-abort.sh
@@ -2,83 +2,101 @@
 
 test_description='git rebase --abort tests'
 
-. ./test-lib.sh
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
-### Test that we handle space characters properly
-work_dir="$(pwd)/test dir"
+. ./test-lib.sh
 
 test_expect_success setup '
-	mkdir -p "$work_dir" &&
-	cd "$work_dir" &&
-	git init &&
-	echo a > a &&
-	git add a &&
-	git commit -m a &&
+	test_commit a a a &&
 	git branch to-rebase &&
 
-	echo b > a &&
-	git commit -a -m b &&
-	echo c > a &&
-	git commit -a -m c &&
+	test_commit --annotate b a b &&
+	test_commit --annotate c a c &&
 
 	git checkout to-rebase &&
-	echo d > a &&
-	git commit -a -m "merge should fail on this" &&
-	echo e > a &&
-	git commit -a -m "merge should fail on this, too" &&
-	git branch pre-rebase
+	test_commit "merge should fail on this" a d d &&
+	test_commit --annotate "merge should fail on this, too" a e pre-rebase
 '
 
+# Check that HEAD is equal to "pre-rebase" and the current branch is
+# "to-rebase"
+check_head() {
+	test_cmp_rev HEAD pre-rebase^{commit} &&
+	test "$(git symbolic-ref HEAD)" = refs/heads/to-rebase
+}
+
 testrebase() {
 	type=$1
-	dotest=$2
+	state_dir=$2
 
 	test_expect_success "rebase$type --abort" '
-		cd "$work_dir" &&
 		# Clean up the state from the previous one
 		git reset --hard pre-rebase &&
-		test_must_fail git rebase$type master &&
-		test_path_is_dir "$dotest" &&
+		test_must_fail git rebase$type main &&
+		test_path_is_dir "$state_dir" &&
+		git rebase --abort &&
+		check_head &&
+		test_path_is_missing "$state_dir"
+	'
+
+	test_expect_success "pre rebase$type head is marked as reachable" '
+		# Clean up the state from the previous one
+		git checkout -f --detach pre-rebase &&
+		test_tick &&
+		git commit --amend --only -m "reworded" &&
+		orig_head=$(git rev-parse HEAD) &&
+		test_must_fail git rebase$type main &&
+		# Stop ORIG_HEAD marking $state_dir/orig-head as reachable
+		git update-ref -d ORIG_HEAD &&
+		git reflog expire --expire="$GIT_COMMITTER_DATE" --all &&
+		git prune --expire=now &&
 		git rebase --abort &&
-		test $(git rev-parse to-rebase) = $(git rev-parse pre-rebase) &&
-		test ! -d "$dotest"
+		test_cmp_rev $orig_head HEAD
 	'
 
 	test_expect_success "rebase$type --abort after --skip" '
-		cd "$work_dir" &&
 		# Clean up the state from the previous one
-		git reset --hard pre-rebase &&
-		test_must_fail git rebase$type master &&
-		test_path_is_dir "$dotest" &&
+		git checkout -B to-rebase pre-rebase &&
+		test_must_fail git rebase$type main &&
+		test_path_is_dir "$state_dir" &&
 		test_must_fail git rebase --skip &&
-		test $(git rev-parse HEAD) = $(git rev-parse master) &&
+		test_cmp_rev HEAD main &&
 		git rebase --abort &&
-		test $(git rev-parse to-rebase) = $(git rev-parse pre-rebase) &&
-		test ! -d "$dotest"
+		check_head &&
+		test_path_is_missing "$state_dir"
 	'
 
 	test_expect_success "rebase$type --abort after --continue" '
-		cd "$work_dir" &&
 		# Clean up the state from the previous one
 		git reset --hard pre-rebase &&
-		test_must_fail git rebase$type master &&
-		test_path_is_dir "$dotest" &&
+		test_must_fail git rebase$type main &&
+		test_path_is_dir "$state_dir" &&
 		echo c > a &&
 		echo d >> a &&
 		git add a &&
 		test_must_fail git rebase --continue &&
-		test $(git rev-parse HEAD) != $(git rev-parse master) &&
+		test_cmp_rev ! HEAD main &&
+		git rebase --abort &&
+		check_head &&
+		test_path_is_missing "$state_dir"
+	'
+
+	test_expect_success "rebase$type --abort when checking out a tag" '
+		test_when_finished "git symbolic-ref HEAD refs/heads/to-rebase" &&
+		git reset --hard a -- &&
+		test_must_fail git rebase$type --onto b c pre-rebase &&
+		test_cmp_rev HEAD b^{commit} &&
 		git rebase --abort &&
-		test $(git rev-parse to-rebase) = $(git rev-parse pre-rebase) &&
-		test ! -d "$dotest"
+		test_cmp_rev HEAD pre-rebase^{commit} &&
+		! git symbolic-ref HEAD
 	'
 
 	test_expect_success "rebase$type --abort does not update reflog" '
-		cd "$work_dir" &&
 		# Clean up the state from the previous one
 		git reset --hard pre-rebase &&
 		git reflog show to-rebase > reflog_before &&
-		test_must_fail git rebase$type master &&
+		test_must_fail git rebase$type main &&
 		git rebase --abort &&
 		git reflog show to-rebase > reflog_after &&
 		test_cmp reflog_before reflog_after &&
@@ -86,41 +104,28 @@ testrebase() {
 	'
 
 	test_expect_success 'rebase --abort can not be used with other options' '
-		cd "$work_dir" &&
 		# Clean up the state from the previous one
 		git reset --hard pre-rebase &&
-		test_must_fail git rebase$type master &&
+		test_must_fail git rebase$type main &&
 		test_must_fail git rebase -v --abort &&
 		test_must_fail git rebase --abort -v &&
 		git rebase --abort
 	'
+
+	test_expect_success "rebase$type --quit" '
+		test_when_finished "git symbolic-ref HEAD refs/heads/to-rebase" &&
+		# Clean up the state from the previous one
+		git reset --hard pre-rebase &&
+		test_must_fail git rebase$type main &&
+		test_path_is_dir $state_dir &&
+		head_before=$(git rev-parse HEAD) &&
+		git rebase --quit &&
+		test_cmp_rev HEAD $head_before &&
+		test_path_is_missing .git/rebase-apply
+	'
 }
 
 testrebase " --apply" .git/rebase-apply
 testrebase " --merge" .git/rebase-merge
 
-test_expect_success 'rebase --apply --quit' '
-	cd "$work_dir" &&
-	# Clean up the state from the previous one
-	git reset --hard pre-rebase &&
-	test_must_fail git rebase --apply master &&
-	test_path_is_dir .git/rebase-apply &&
-	head_before=$(git rev-parse HEAD) &&
-	git rebase --quit &&
-	test $(git rev-parse HEAD) = $head_before &&
-	test ! -d .git/rebase-apply
-'
-
-test_expect_success 'rebase --merge --quit' '
-	cd "$work_dir" &&
-	# Clean up the state from the previous one
-	git reset --hard pre-rebase &&
-	test_must_fail git rebase --merge master &&
-	test_path_is_dir .git/rebase-merge &&
-	head_before=$(git rev-parse HEAD) &&
-	git rebase --quit &&
-	test $(git rev-parse HEAD) = $head_before &&
-	test ! -d .git/rebase-merge
-'
-
 test_done
diff --git a/t/t3408-rebase-multi-line.sh b/t/t3408-rebase-multi-line.sh
index d2bd7c1..7b4607d 100755
--- a/t/t3408-rebase-multi-line.sh
+++ b/t/t3408-rebase-multi-line.sh
@@ -2,6 +2,10 @@
 
 test_description='rebasing a commit with multi-line first paragraph.'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -46,20 +50,10 @@ But otherwise with a sane description." side2 &&
 test_expect_success rebase '
 
 	git checkout side &&
-	git rebase master &&
+	git rebase main &&
 	git cat-file commit HEAD | sed -e "1,/^\$/d" >actual &&
 	git cat-file commit side@{1} | sed -e "1,/^\$/d" >expect &&
 	test_cmp expect actual
 
 '
-test_expect_success REBASE_P rebasep '
-
-	git checkout side-merge &&
-	git rebase -p side &&
-	git cat-file commit HEAD | sed -e "1,/^\$/d" >actual &&
-	git cat-file commit side-merge-original | sed -e "1,/^\$/d" >expect &&
-	test_cmp expect actual
-
-'
-
 test_done
diff --git a/t/t3409-rebase-environ.sh b/t/t3409-rebase-environ.sh
new file mode 100755
index 0000000..acaf555
--- /dev/null
+++ b/t/t3409-rebase-environ.sh
@@ -0,0 +1,24 @@
+#!/bin/sh
+
+test_description='git rebase interactive environment'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+test_expect_success 'setup' '
+	test_commit one &&
+	test_commit two &&
+	test_commit three
+'
+
+test_expect_success 'rebase --exec does not muck with GIT_DIR' '
+	git rebase --exec "printf %s \$GIT_DIR >environ" HEAD~1 &&
+	test_must_be_empty environ
+'
+
+test_expect_success 'rebase --exec does not muck with GIT_WORK_TREE' '
+	git rebase --exec "printf %s \$GIT_WORK_TREE >environ" HEAD~1 &&
+	test_must_be_empty environ
+'
+
+test_done
diff --git a/t/t3409-rebase-preserve-merges.sh b/t/t3409-rebase-preserve-merges.sh
deleted file mode 100755
index 3b340f1..0000000
--- a/t/t3409-rebase-preserve-merges.sh
+++ /dev/null
@@ -1,127 +0,0 @@
-#!/bin/sh
-#
-# Copyright(C) 2008 Stephen Habermann & Andreas Ericsson
-#
-test_description='git rebase -p should preserve merges
-
-Run "git rebase -p" and check that merges are properly carried along
-'
-. ./test-lib.sh
-
-if ! test_have_prereq REBASE_P; then
-	skip_all='skipping git rebase -p tests, as asked for'
-	test_done
-fi
-
-GIT_AUTHOR_EMAIL=bogus_email_address
-export GIT_AUTHOR_EMAIL
-
-# Clone 2 (conflicting merge):
-#
-# A1--A2--B3   <-- origin/master
-#  \       \
-#   B1------M  <-- topic
-#    \
-#     B2       <-- origin/topic
-#
-# Clone 3 (no-ff merge):
-#
-# A1--A2--B3   <-- origin/master
-#  \
-#   B1------M  <-- topic
-#    \     /
-#     \--A3    <-- topic2
-#      \
-#       B2     <-- origin/topic
-#
-# Clone 4 (same as Clone 3)
-
-test_expect_success 'setup for merge-preserving rebase' \
-	'echo First > A &&
-	git add A &&
-	git commit -m "Add A1" &&
-	git checkout -b topic &&
-	echo Second > B &&
-	git add B &&
-	git commit -m "Add B1" &&
-	git checkout -f master &&
-	echo Third >> A &&
-	git commit -a -m "Modify A2" &&
-	echo Fifth > B &&
-	git add B &&
-	git commit -m "Add different B" &&
-
-	git clone ./. clone2 &&
-	(
-		cd clone2 &&
-		git checkout -b topic origin/topic &&
-		test_must_fail git merge origin/master &&
-		echo Resolved >B &&
-		git add B &&
-		git commit -m "Merge origin/master into topic"
-	) &&
-
-	git clone ./. clone3 &&
-	(
-		cd clone3 &&
-		git checkout -b topic2 origin/topic &&
-		echo Sixth > A &&
-		git commit -a -m "Modify A3" &&
-		git checkout -b topic origin/topic &&
-		git merge --no-ff topic2
-	) &&
-
-	git clone ./. clone4 &&
-	(
-		cd clone4 &&
-		git checkout -b topic2 origin/topic &&
-		echo Sixth > A &&
-		git commit -a -m "Modify A3" &&
-		git checkout -b topic origin/topic &&
-		git merge --no-ff topic2
-	) &&
-
-	git checkout topic &&
-	echo Fourth >> B &&
-	git commit -a -m "Modify B2"
-'
-
-test_expect_success '--continue works after a conflict' '
-	(
-	cd clone2 &&
-	git fetch &&
-	test_must_fail git rebase -p origin/topic &&
-	test 2 = $(git ls-files B | wc -l) &&
-	echo Resolved again > B &&
-	test_must_fail git rebase --continue &&
-	grep "^@@@ " .git/rebase-merge/patch &&
-	git add B &&
-	git rebase --continue &&
-	test 1 = $(git rev-list --all --pretty=oneline | grep "Modify A" | wc -l) &&
-	test 1 = $(git rev-list --all --pretty=oneline | grep "Add different" | wc -l) &&
-	test 1 = $(git rev-list --all --pretty=oneline | grep "Merge origin" | wc -l)
-	)
-'
-
-test_expect_success 'rebase -p preserves no-ff merges' '
-	(
-	cd clone3 &&
-	git fetch &&
-	git rebase -p origin/topic &&
-	test 3 = $(git rev-list --all --pretty=oneline | grep "Modify A" | wc -l) &&
-	test 1 = $(git rev-list --all --pretty=oneline | grep "Merge branch" | wc -l)
-	)
-'
-
-test_expect_success 'rebase -p ignores merge.log config' '
-	(
-	cd clone4 &&
-	git fetch &&
-	git -c merge.log=1 rebase -p origin/topic &&
-	echo >expected &&
-	git log --format="%b" -1 >current &&
-	test_cmp expected current
-	)
-'
-
-test_done
diff --git a/t/t3410-rebase-preserve-dropped-merges.sh b/t/t3410-rebase-preserve-dropped-merges.sh
deleted file mode 100755
index 2e29866..0000000
--- a/t/t3410-rebase-preserve-dropped-merges.sh
+++ /dev/null
@@ -1,90 +0,0 @@
-#!/bin/sh
-#
-# Copyright (c) 2008 Stephen Haberman
-#
-
-test_description='git rebase preserve merges
-
-This test runs git rebase with preserve merges and ensures commits
-dropped by the --cherry-pick flag have their childrens parents
-rewritten.
-'
-. ./test-lib.sh
-
-if ! test_have_prereq REBASE_P; then
-	skip_all='skipping git rebase -p tests, as asked for'
-	test_done
-fi
-
-# set up two branches like this:
-#
-# A - B - C - D - E
-#   \
-#     F - G - H
-#       \
-#         I
-#
-# where B, D and G touch the same file.
-
-test_expect_success 'setup' '
-	test_commit A file1 &&
-	test_commit B file1 1 &&
-	test_commit C file2 &&
-	test_commit D file1 2 &&
-	test_commit E file3 &&
-	git checkout A &&
-	test_commit F file4 &&
-	test_commit G file1 3 &&
-	test_commit H file5 &&
-	git checkout F &&
-	test_commit I file6
-'
-
-# A - B - C - D - E
-#   \             \ \
-#     F - G - H -- L \        -->   L
-#       \            |               \
-#         I -- G2 -- J -- K           I -- K
-# G2 = same changes as G
-test_expect_success 'skip same-resolution merges with -p' '
-	git checkout H &&
-	test_must_fail git merge E &&
-	test_commit L file1 23 &&
-	git checkout I &&
-	test_commit G2 file1 3 &&
-	test_must_fail git merge E &&
-	test_commit J file1 23 &&
-	test_commit K file7 file7 &&
-	git rebase -i -p L &&
-	test $(git rev-parse HEAD^^) = $(git rev-parse L) &&
-	test "23" = "$(cat file1)" &&
-	test "I" = "$(cat file6)" &&
-	test "file7" = "$(cat file7)"
-'
-
-# A - B - C - D - E
-#   \             \ \
-#     F - G - H -- L2 \        -->   L2
-#       \             |                \
-#         I -- G3 --- J2 -- K2           I -- G3 -- K2
-# G2 = different changes as G
-test_expect_success 'keep different-resolution merges with -p' '
-	git checkout H &&
-	test_must_fail git merge E &&
-	test_commit L2 file1 23 &&
-	git checkout I &&
-	test_commit G3 file1 4 &&
-	test_must_fail git merge E &&
-	test_commit J2 file1 24 &&
-	test_commit K2 file7 file7 &&
-	test_must_fail git rebase -i -p L2 &&
-	echo 234 > file1 &&
-	git add file1 &&
-	git rebase --continue &&
-	test $(git rev-parse HEAD^^^) = $(git rev-parse L2) &&
-	test "234" = "$(cat file1)" &&
-	test "I" = "$(cat file6)" &&
-	test "file7" = "$(cat file7)"
-'
-
-test_done
diff --git a/t/t3411-rebase-preserve-around-merges.sh b/t/t3411-rebase-preserve-around-merges.sh
deleted file mode 100755
index fb45e7b..0000000
--- a/t/t3411-rebase-preserve-around-merges.sh
+++ /dev/null
@@ -1,80 +0,0 @@
-#!/bin/sh
-#
-# Copyright (c) 2008 Stephen Haberman
-#
-
-test_description='git rebase preserve merges
-
-This test runs git rebase with -p and tries to squash a commit from after
-a merge to before the merge.
-'
-. ./test-lib.sh
-
-if ! test_have_prereq REBASE_P; then
-	skip_all='skipping git rebase -p tests, as asked for'
-	test_done
-fi
-
-. "$TEST_DIRECTORY"/lib-rebase.sh
-
-set_fake_editor
-
-# set up two branches like this:
-#
-# A1 - B1 - D1 - E1 - F1
-#       \        /
-#        -- C1 --
-
-test_expect_success 'setup' '
-	test_commit A1 &&
-	test_commit B1 &&
-	test_commit C1 &&
-	git reset --hard B1 &&
-	test_commit D1 &&
-	test_merge E1 C1 &&
-	test_commit F1
-'
-
-# Should result in:
-#
-# A1 - B1 - D2 - E2
-#       \        /
-#        -- C1 --
-#
-test_expect_success 'squash F1 into D1' '
-	FAKE_LINES="1 squash 4 2 3" git rebase -i -p B1 &&
-	test "$(git rev-parse HEAD^2)" = "$(git rev-parse C1)" &&
-	test "$(git rev-parse HEAD~2)" = "$(git rev-parse B1)" &&
-	git tag E2
-'
-
-# Start with:
-#
-# A1 - B1 - D2 - E2
-#  \
-#   G1 ---- L1 ---- M1
-#    \             /
-#     H1 -- J1 -- K1
-#      \         /
-#        -- I1 --
-#
-# And rebase G1..M1 onto E2
-
-test_expect_success 'rebase two levels of merge' '
-	git checkout A1 &&
-	test_commit G1 &&
-	test_commit H1 &&
-	test_commit I1 &&
-	git checkout -b branch3 H1 &&
-	test_commit J1 &&
-	test_merge K1 I1 &&
-	git checkout -b branch2 G1 &&
-	test_commit L1 &&
-	test_merge M1 K1 &&
-	GIT_EDITOR=: git rebase -i -p E2 &&
-	test "$(git rev-parse HEAD~3)" = "$(git rev-parse E2)" &&
-	test "$(git rev-parse HEAD~2)" = "$(git rev-parse HEAD^2^2~2)" &&
-	test "$(git rev-parse HEAD^2^1^1)" = "$(git rev-parse HEAD^2^2^1)"
-'
-
-test_done
diff --git a/t/t3412-rebase-root.sh b/t/t3412-rebase-root.sh
index 21632a9..e75b3d0 100755
--- a/t/t3412-rebase-root.sh
+++ b/t/t3412-rebase-root.sh
@@ -4,11 +4,15 @@ test_description='git rebase --root
 
 Tests if git rebase --root --onto <newparent> can rebase the root commit.
 '
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 log_with_names () {
 	git rev-list --topo-order --parents --pretty="tformat:%s" HEAD |
-	git name-rev --stdin --name-only --refs=refs/heads/$1
+	git name-rev --annotate-stdin --name-only --refs=refs/heads/$1
 }
 
 
@@ -24,16 +28,13 @@ test_expect_success 'prepare repository' '
 
 test_expect_success 'rebase --root fails with too many args' '
 	git checkout -B fail other &&
-	test_must_fail git rebase --onto master --root fail fail
+	test_must_fail git rebase --onto main --root fail fail
 '
 
 test_expect_success 'setup pre-rebase hook' '
-	mkdir -p .git/hooks &&
-	cat >.git/hooks/pre-rebase <<EOF &&
-#!$SHELL_PATH
-echo "\$1,\$2" >.git/PRE-REBASE-INPUT
-EOF
-	chmod +x .git/hooks/pre-rebase
+	test_hook --setup pre-rebase <<-\EOF
+	echo "$1,$2" >.git/PRE-REBASE-INPUT
+	EOF
 '
 cat > expect <<EOF
 4
@@ -44,7 +45,7 @@ EOF
 
 test_expect_success 'rebase --root --onto <newbase>' '
 	git checkout -b work other &&
-	git rebase --root --onto master &&
+	git rebase --root --onto main &&
 	git log --pretty=tformat:"%s" > rebased &&
 	test_cmp expect rebased
 '
@@ -55,7 +56,7 @@ test_expect_success 'pre-rebase got correct input (1)' '
 
 test_expect_success 'rebase --root --onto <newbase> <branch>' '
 	git branch work2 other &&
-	git rebase --root --onto master work2 &&
+	git rebase --root --onto main work2 &&
 	git log --pretty=tformat:"%s" > rebased2 &&
 	test_cmp expect rebased2
 '
@@ -66,7 +67,7 @@ test_expect_success 'pre-rebase got correct input (2)' '
 
 test_expect_success 'rebase -i --root --onto <newbase>' '
 	git checkout -b work3 other &&
-	git rebase -i --root --onto master &&
+	git rebase -i --root --onto main &&
 	git log --pretty=tformat:"%s" > rebased3 &&
 	test_cmp expect rebased3
 '
@@ -77,7 +78,7 @@ test_expect_success 'pre-rebase got correct input (3)' '
 
 test_expect_success 'rebase -i --root --onto <newbase> <branch>' '
 	git branch work4 other &&
-	git rebase -i --root --onto master work4 &&
+	git rebase -i --root --onto main work4 &&
 	git log --pretty=tformat:"%s" > rebased4 &&
 	test_cmp expect rebased4
 '
@@ -86,17 +87,6 @@ test_expect_success 'pre-rebase got correct input (4)' '
 	test "z$(cat .git/PRE-REBASE-INPUT)" = z--root,work4
 '
 
-test_expect_success REBASE_P 'rebase -i -p with linear history' '
-	git checkout -b work5 other &&
-	git rebase -i -p --root --onto master &&
-	git log --pretty=tformat:"%s" > rebased5 &&
-	test_cmp expect rebased5
-'
-
-test_expect_success REBASE_P 'pre-rebase got correct input (5)' '
-	test "z$(cat .git/PRE-REBASE-INPUT)" = z--root,
-'
-
 test_expect_success 'set up merge history' '
 	git checkout other^ &&
 	git checkout -b side &&
@@ -120,13 +110,6 @@ commit work6~4
 1
 EOF
 
-test_expect_success REBASE_P 'rebase -i -p with merge' '
-	git checkout -b work6 other &&
-	git rebase -i -p --root --onto master &&
-	log_with_names work6 > rebased6 &&
-	test_cmp expect-side rebased6
-'
-
 test_expect_success 'set up second root and merge' '
 	git symbolic-ref HEAD refs/heads/third &&
 	rm .git/index &&
@@ -155,32 +138,22 @@ commit work7~5
 1
 EOF
 
-test_expect_success REBASE_P 'rebase -i -p with two roots' '
-	git checkout -b work7 other &&
-	git rebase -i -p --root --onto master &&
-	log_with_names work7 > rebased7 &&
-	test_cmp expect-third rebased7
-'
-
 test_expect_success 'setup pre-rebase hook that fails' '
-	mkdir -p .git/hooks &&
-	cat >.git/hooks/pre-rebase <<EOF &&
-#!$SHELL_PATH
-false
-EOF
-	chmod +x .git/hooks/pre-rebase
+	test_hook --setup --clobber pre-rebase <<-\EOF
+	false
+	EOF
 '
 
 test_expect_success 'pre-rebase hook stops rebase' '
 	git checkout -b stops1 other &&
-	test_must_fail git rebase --root --onto master &&
+	test_must_fail git rebase --root --onto main &&
 	test "z$(git symbolic-ref HEAD)" = zrefs/heads/stops1 &&
 	test 0 = $(git rev-list other...stops1 | wc -l)
 '
 
 test_expect_success 'pre-rebase hook stops rebase -i' '
 	git checkout -b stops2 other &&
-	test_must_fail git rebase --root --onto master &&
+	test_must_fail git rebase --root --onto main &&
 	test "z$(git symbolic-ref HEAD)" = zrefs/heads/stops2 &&
 	test 0 = $(git rev-list other...stops2 | wc -l)
 '
@@ -190,7 +163,7 @@ test_expect_success 'remove pre-rebase hook' '
 '
 
 test_expect_success 'set up a conflict' '
-	git checkout master &&
+	git checkout main &&
 	echo conflict > B &&
 	git add B &&
 	git commit -m conflict
@@ -198,7 +171,7 @@ test_expect_success 'set up a conflict' '
 
 test_expect_success 'rebase --root with conflict (first part)' '
 	git checkout -b conflict1 other &&
-	test_must_fail git rebase --root --onto master &&
+	test_must_fail git rebase --root --onto main &&
 	git ls-files -u | grep "B$"
 '
 
@@ -225,7 +198,7 @@ test_expect_success 'rebase --root with conflict (second part)' '
 
 test_expect_success 'rebase -i --root with conflict (first part)' '
 	git checkout -b conflict2 other &&
-	test_must_fail git rebase -i --root --onto master &&
+	test_must_fail git rebase -i --root --onto main &&
 	git ls-files -u | grep "B$"
 '
 
@@ -261,21 +234,9 @@ commit conflict3~6
 1
 EOF
 
-test_expect_success REBASE_P 'rebase -i -p --root with conflict (first part)' '
-	git checkout -b conflict3 other &&
-	test_must_fail git rebase -i -p --root --onto master &&
-	git ls-files -u | grep "B$"
-'
-
 test_expect_success 'fix the conflict' '
 	echo 3 > B &&
 	git add B
 '
 
-test_expect_success REBASE_P 'rebase -i -p --root with conflict (second part)' '
-	git rebase --continue &&
-	log_with_names conflict3 >out &&
-	test_cmp expect-conflict-p out
-'
-
 test_done
diff --git a/t/t3413-rebase-hook.sh b/t/t3413-rebase-hook.sh
index b6833e9..e845683 100755
--- a/t/t3413-rebase-hook.sh
+++ b/t/t3413-rebase-hook.sh
@@ -2,6 +2,10 @@
 
 test_description='git rebase with its hook(s)'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -18,7 +22,7 @@ test_expect_success setup '
 	git add git &&
 	test_tick &&
 	git commit -m side &&
-	git checkout master &&
+	git checkout main &&
 	git log --pretty=oneline --abbrev-commit --graph --all &&
 	git branch test side
 '
@@ -26,91 +30,85 @@ test_expect_success setup '
 test_expect_success 'rebase' '
 	git checkout test &&
 	git reset --hard side &&
-	git rebase master &&
+	git rebase main &&
 	test "z$(cat git)" = zworld
 '
 
 test_expect_success 'rebase -i' '
 	git checkout test &&
 	git reset --hard side &&
-	EDITOR=true git rebase -i master &&
+	EDITOR=true git rebase -i main &&
 	test "z$(cat git)" = zworld
 '
 
 test_expect_success 'setup pre-rebase hook' '
-	mkdir -p .git/hooks &&
-	cat >.git/hooks/pre-rebase <<EOF &&
-#!$SHELL_PATH
-echo "\$1,\$2" >.git/PRE-REBASE-INPUT
-EOF
-	chmod +x .git/hooks/pre-rebase
+	test_hook --setup pre-rebase <<-\EOF
+	echo "$1,$2" >.git/PRE-REBASE-INPUT
+	EOF
 '
 
 test_expect_success 'pre-rebase hook gets correct input (1)' '
 	git checkout test &&
 	git reset --hard side &&
-	git rebase master &&
+	git rebase main &&
 	test "z$(cat git)" = zworld &&
-	test "z$(cat .git/PRE-REBASE-INPUT)" = zmaster,
+	test "z$(cat .git/PRE-REBASE-INPUT)" = zmain,
 
 '
 
 test_expect_success 'pre-rebase hook gets correct input (2)' '
 	git checkout test &&
 	git reset --hard side &&
-	git rebase master test &&
+	git rebase main test &&
 	test "z$(cat git)" = zworld &&
-	test "z$(cat .git/PRE-REBASE-INPUT)" = zmaster,test
+	test "z$(cat .git/PRE-REBASE-INPUT)" = zmain,test
 '
 
 test_expect_success 'pre-rebase hook gets correct input (3)' '
 	git checkout test &&
 	git reset --hard side &&
-	git checkout master &&
-	git rebase master test &&
+	git checkout main &&
+	git rebase main test &&
 	test "z$(cat git)" = zworld &&
-	test "z$(cat .git/PRE-REBASE-INPUT)" = zmaster,test
+	test "z$(cat .git/PRE-REBASE-INPUT)" = zmain,test
 '
 
 test_expect_success 'pre-rebase hook gets correct input (4)' '
 	git checkout test &&
 	git reset --hard side &&
-	EDITOR=true git rebase -i master &&
+	EDITOR=true git rebase -i main &&
 	test "z$(cat git)" = zworld &&
-	test "z$(cat .git/PRE-REBASE-INPUT)" = zmaster,
+	test "z$(cat .git/PRE-REBASE-INPUT)" = zmain,
 
 '
 
 test_expect_success 'pre-rebase hook gets correct input (5)' '
 	git checkout test &&
 	git reset --hard side &&
-	EDITOR=true git rebase -i master test &&
+	EDITOR=true git rebase -i main test &&
 	test "z$(cat git)" = zworld &&
-	test "z$(cat .git/PRE-REBASE-INPUT)" = zmaster,test
+	test "z$(cat .git/PRE-REBASE-INPUT)" = zmain,test
 '
 
 test_expect_success 'pre-rebase hook gets correct input (6)' '
 	git checkout test &&
 	git reset --hard side &&
-	git checkout master &&
-	EDITOR=true git rebase -i master test &&
+	git checkout main &&
+	EDITOR=true git rebase -i main test &&
 	test "z$(cat git)" = zworld &&
-	test "z$(cat .git/PRE-REBASE-INPUT)" = zmaster,test
+	test "z$(cat .git/PRE-REBASE-INPUT)" = zmain,test
 '
 
 test_expect_success 'setup pre-rebase hook that fails' '
-	mkdir -p .git/hooks &&
-	cat >.git/hooks/pre-rebase <<EOF &&
-#!$SHELL_PATH
-false
-EOF
-	chmod +x .git/hooks/pre-rebase
+	test_hook --setup --clobber pre-rebase <<-\EOF
+	false
+	EOF
 '
 
 test_expect_success 'pre-rebase hook stops rebase (1)' '
 	git checkout test &&
 	git reset --hard side &&
-	test_must_fail git rebase master &&
+	test_must_fail git rebase main &&
 	test "z$(git symbolic-ref HEAD)" = zrefs/heads/test &&
 	test 0 = $(git rev-list HEAD...side | wc -l)
 '
@@ -118,7 +116,7 @@ test_expect_success 'pre-rebase hook stops rebase (1)' '
 test_expect_success 'pre-rebase hook stops rebase (2)' '
 	git checkout test &&
 	git reset --hard side &&
-	test_must_fail env EDITOR=: git rebase -i master &&
+	test_must_fail env EDITOR=: git rebase -i main &&
 	test "z$(git symbolic-ref HEAD)" = zrefs/heads/test &&
 	test 0 = $(git rev-list HEAD...side | wc -l)
 '
@@ -126,7 +124,7 @@ test_expect_success 'pre-rebase hook stops rebase (2)' '
 test_expect_success 'rebase --no-verify overrides pre-rebase (1)' '
 	git checkout test &&
 	git reset --hard side &&
-	git rebase --no-verify master &&
+	git rebase --no-verify main &&
 	test "z$(git symbolic-ref HEAD)" = zrefs/heads/test &&
 	test "z$(cat git)" = zworld
 '
@@ -134,7 +132,7 @@ test_expect_success 'rebase --no-verify overrides pre-rebase (1)' '
 test_expect_success 'rebase --no-verify overrides pre-rebase (2)' '
 	git checkout test &&
 	git reset --hard side &&
-	EDITOR=true git rebase --no-verify -i master &&
+	EDITOR=true git rebase --no-verify -i main &&
 	test "z$(git symbolic-ref HEAD)" = zrefs/heads/test &&
 	test "z$(cat git)" = zworld
 '
diff --git a/t/t3414-rebase-preserve-onto.sh b/t/t3414-rebase-preserve-onto.sh
deleted file mode 100755
index 72e04b5..0000000
--- a/t/t3414-rebase-preserve-onto.sh
+++ /dev/null
@@ -1,85 +0,0 @@
-#!/bin/sh
-#
-# Copyright (c) 2009 Greg Price
-#
-
-test_description='git rebase -p should respect --onto
-
-In a rebase with --onto, we should rewrite all the commits that
-aren'"'"'t on top of $ONTO, even if they are on top of $UPSTREAM.
-'
-. ./test-lib.sh
-
-if ! test_have_prereq REBASE_P; then
-	skip_all='skipping git rebase -p tests, as asked for'
-	test_done
-fi
-
-. "$TEST_DIRECTORY"/lib-rebase.sh
-
-# Set up branches like this:
-# A1---B1---E1---F1---G1
-#  \    \             /
-#   \    \--C1---D1--/
-#    H1
-
-test_expect_success 'setup' '
-	test_commit A1 &&
-	test_commit B1 &&
-	test_commit C1 &&
-	test_commit D1 &&
-	git reset --hard B1 &&
-	test_commit E1 &&
-	test_commit F1 &&
-	test_merge G1 D1 &&
-	git reset --hard A1 &&
-	test_commit H1
-'
-
-# Now rebase merge G1 from both branches' base B1, both should move:
-# A1---B1---E1---F1---G1
-#  \    \             /
-#   \    \--C1---D1--/
-#    \
-#     H1---E2---F2---G2
-#      \             /
-#       \--C2---D2--/
-
-test_expect_success 'rebase from B1 onto H1' '
-	git checkout G1 &&
-	git rebase -p --onto H1 B1 &&
-	test "$(git rev-parse HEAD^1^1^1)" = "$(git rev-parse H1)" &&
-	test "$(git rev-parse HEAD^2^1^1)" = "$(git rev-parse H1)"
-'
-
-# On the other hand if rebase from E1 which is within one branch,
-# then the other branch stays:
-# A1---B1---E1---F1---G1
-#  \    \             /
-#   \    \--C1---D1--/
-#    \             \
-#     H1-----F3-----G3
-
-test_expect_success 'rebase from E1 onto H1' '
-	git checkout G1 &&
-	git rebase -p --onto H1 E1 &&
-	test "$(git rev-parse HEAD^1^1)" = "$(git rev-parse H1)" &&
-	test "$(git rev-parse HEAD^2)" = "$(git rev-parse D1)"
-'
-
-# And the same if we rebase from a commit in the second-parent branch.
-# A1---B1---E1---F1----G1
-#  \    \          \   /
-#   \    \--C1---D1-\-/
-#    \               \
-#     H1------D3------G4
-
-test_expect_success 'rebase from C1 onto H1' '
-	git checkout G1 &&
-	git rev-list --first-parent --pretty=oneline C1..G1 &&
-	git rebase -p --onto H1 C1 &&
-	test "$(git rev-parse HEAD^2^1)" = "$(git rev-parse H1)" &&
-	test "$(git rev-parse HEAD^1)" = "$(git rev-parse F1)"
-'
-
-test_done
diff --git a/t/t3415-rebase-autosquash.sh b/t/t3415-rebase-autosquash.sh
index 7bab600..fcc40d6 100755
--- a/t/t3415-rebase-autosquash.sh
+++ b/t/t3415-rebase-autosquash.sh
@@ -2,6 +2,9 @@
 
 test_description='auto squash'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 . "$TEST_DIRECTORY"/lib-rebase.sh
@@ -40,7 +43,7 @@ test_auto_fixup () {
 
 	git tag $1 &&
 	test_tick &&
-	git rebase $2 -i HEAD^^^ &&
+	git rebase $2 HEAD^^^ &&
 	git log --oneline >actual &&
 	if test -n "$no_squash"
 	then
@@ -58,15 +61,24 @@ test_auto_fixup () {
 }
 
 test_expect_success 'auto fixup (option)' '
-	test_auto_fixup final-fixup-option --autosquash
+	test_auto_fixup fixup-option --autosquash &&
+	test_auto_fixup fixup-option-i "--autosquash -i"
 '
 
-test_expect_success 'auto fixup (config)' '
+test_expect_success 'auto fixup (config true)' '
 	git config rebase.autosquash true &&
-	test_auto_fixup final-fixup-config-true &&
+	test_auto_fixup ! fixup-config-true &&
+	test_auto_fixup fixup-config-true-i -i &&
 	test_auto_fixup ! fixup-config-true-no --no-autosquash &&
+	test_auto_fixup ! fixup-config-true-i-no "-i --no-autosquash"
+'
+
+test_expect_success 'auto fixup (config false)' '
 	git config rebase.autosquash false &&
-	test_auto_fixup ! final-fixup-config-false
+	test_auto_fixup ! fixup-config-false &&
+	test_auto_fixup ! fixup-config-false-i -i &&
+	test_auto_fixup fixup-config-false-yes --autosquash &&
+	test_auto_fixup fixup-config-false-i-yes "-i --autosquash"
 '
 
 test_auto_squash () {
@@ -81,11 +93,10 @@ test_auto_squash () {
 	echo 1 >file1 &&
 	git add -u &&
 	test_tick &&
-	git commit -m "squash! first" &&
-
+	git commit -m "squash! first" -m "extra para for first" &&
 	git tag $1 &&
 	test_tick &&
-	git rebase $2 -i HEAD^^^ &&
+	git rebase $2 HEAD^^^ &&
 	git log --oneline >actual &&
 	if test -n "$no_squash"
 	then
@@ -103,15 +114,24 @@ test_auto_squash () {
 }
 
 test_expect_success 'auto squash (option)' '
-	test_auto_squash final-squash --autosquash
+	test_auto_squash squash-option --autosquash &&
+	test_auto_squash squash-option-i "--autosquash -i"
 '
 
-test_expect_success 'auto squash (config)' '
+test_expect_success 'auto squash (config true)' '
 	git config rebase.autosquash true &&
-	test_auto_squash final-squash-config-true &&
+	test_auto_squash ! squash-config-true &&
+	test_auto_squash squash-config-true-i -i &&
 	test_auto_squash ! squash-config-true-no --no-autosquash &&
+	test_auto_squash ! squash-config-true-i-no "-i --no-autosquash"
+'
+
+test_expect_success 'auto squash (config false)' '
 	git config rebase.autosquash false &&
-	test_auto_squash ! final-squash-config-false
+	test_auto_squash ! squash-config-false &&
+	test_auto_squash ! squash-config-false-i -i &&
+	test_auto_squash squash-config-false-yes --autosquash &&
+	test_auto_squash squash-config-false-i-yes "-i --autosquash"
 '
 
 test_expect_success 'misspelled auto squash' '
@@ -139,7 +159,7 @@ test_expect_success 'auto squash that matches 2 commits' '
 	echo 1 >file1 &&
 	git add -u &&
 	test_tick &&
-	git commit -m "squash! first" &&
+	git commit -m "squash! first" -m "extra para for first" &&
 	git tag final-multisquash &&
 	test_tick &&
 	git rebase --autosquash -i HEAD~4 &&
@@ -192,7 +212,7 @@ test_expect_success 'auto squash that matches a sha1' '
 	git add -u &&
 	test_tick &&
 	oid=$(git rev-parse --short HEAD^) &&
-	git commit -m "squash! $oid" &&
+	git commit -m "squash! $oid" -m "extra para" &&
 	git tag final-shasquash &&
 	test_tick &&
 	git rebase --autosquash -i HEAD^^^ &&
@@ -203,7 +223,8 @@ test_expect_success 'auto squash that matches a sha1' '
 	git cat-file blob HEAD^:file1 >actual &&
 	test_cmp expect actual &&
 	git cat-file commit HEAD^ >commit &&
-	grep squash commit >actual &&
+	! grep "squash" commit &&
+	grep "^extra para" commit >actual &&
 	test_line_count = 1 actual
 '
 
@@ -213,7 +234,7 @@ test_expect_success 'auto squash that matches longer sha1' '
 	git add -u &&
 	test_tick &&
 	oid=$(git rev-parse --short=11 HEAD^) &&
-	git commit -m "squash! $oid" &&
+	git commit -m "squash! $oid" -m "extra para" &&
 	git tag final-longshasquash &&
 	test_tick &&
 	git rebase --autosquash -i HEAD^^^ &&
@@ -224,16 +245,30 @@ test_expect_success 'auto squash that matches longer sha1' '
 	git cat-file blob HEAD^:file1 >actual &&
 	test_cmp expect actual &&
 	git cat-file commit HEAD^ >commit &&
-	grep squash commit >actual &&
+	! grep "squash" commit &&
+	grep "^extra para" commit >actual &&
 	test_line_count = 1 actual
 '
 
+test_expect_success 'auto squash of fixup commit that matches branch name which points back to fixup commit' '
+	git reset --hard base &&
+	git commit --allow-empty -m "fixup! self-cycle" &&
+	git branch self-cycle &&
+	GIT_SEQUENCE_EDITOR="cat >tmp" git rebase --autosquash -i HEAD^^ &&
+	sed -ne "/^[^#]/{s/[0-9a-f]\{7,\}/HASH/g;p;}" tmp >actual &&
+	cat <<-EOF >expect &&
+	pick HASH second commit
+	pick HASH fixup! self-cycle # empty
+	EOF
+	test_cmp expect actual
+'
+
 test_auto_commit_flags () {
 	git reset --hard base &&
 	echo 1 >file1 &&
 	git add -u &&
 	test_tick &&
-	git commit --$1 first-commit &&
+	git commit --$1 first-commit -m "extra para for first" &&
 	git tag final-commit-$1 &&
 	test_tick &&
 	git rebase --autosquash -i HEAD^^^ &&
@@ -261,11 +296,11 @@ test_auto_fixup_fixup () {
 	echo 1 >file1 &&
 	git add -u &&
 	test_tick &&
-	git commit -m "$1! first" &&
+	git commit -m "$1! first" -m "extra para for first" &&
 	echo 2 >file1 &&
 	git add -u &&
 	test_tick &&
-	git commit -m "$1! $2! first" &&
+	git commit -m "$1! $2! first" -m "second extra para for first" &&
 	git tag "final-$1-$2" &&
 	test_tick &&
 	(
@@ -303,35 +338,35 @@ test_auto_fixup_fixup () {
 	fi
 }
 
-test_expect_success C_LOCALE_OUTPUT 'fixup! fixup!' '
+test_expect_success 'fixup! fixup!' '
 	test_auto_fixup_fixup fixup fixup
 '
 
-test_expect_success C_LOCALE_OUTPUT 'fixup! squash!' '
+test_expect_success 'fixup! squash!' '
 	test_auto_fixup_fixup fixup squash
 '
 
-test_expect_success C_LOCALE_OUTPUT 'squash! squash!' '
+test_expect_success 'squash! squash!' '
 	test_auto_fixup_fixup squash squash
 '
 
-test_expect_success C_LOCALE_OUTPUT 'squash! fixup!' '
+test_expect_success 'squash! fixup!' '
 	test_auto_fixup_fixup squash fixup
 '
 
-test_expect_success C_LOCALE_OUTPUT 'autosquash with custom inst format' '
+test_expect_success 'autosquash with custom inst format' '
 	git reset --hard base &&
 	git config --add rebase.instructionFormat "[%an @ %ar] %s"  &&
 	echo 2 >file1 &&
 	git add -u &&
 	test_tick &&
 	oid=$(git rev-parse --short HEAD^) &&
-	git commit -m "squash! $oid" &&
+	git commit -m "squash! $oid" -m "extra para for first" &&
 	echo 1 >file1 &&
 	git add -u &&
 	test_tick &&
 	subject=$(git log -n 1 --format=%s HEAD~2) &&
-	git commit -m "squash! $subject" &&
+	git commit -m "squash! $subject" -m "second extra para for first" &&
 	git tag final-squash-instFmt &&
 	test_tick &&
 	git rebase --autosquash -i HEAD~4 &&
@@ -342,8 +377,9 @@ test_expect_success C_LOCALE_OUTPUT 'autosquash with custom inst format' '
 	git cat-file blob HEAD^:file1 >actual &&
 	test_cmp expect actual &&
 	git cat-file commit HEAD^ >commit &&
-	grep squash commit >actual &&
-	test_line_count = 2 actual
+	! grep "squash" commit &&
+	grep first commit >actual &&
+	test_line_count = 3 actual
 '
 
 test_expect_success 'autosquash with empty custom instructionFormat' '
@@ -407,7 +443,7 @@ test_expect_success 'wrapped original subject' '
 
 test_expect_success 'abort last squash' '
 	test_when_finished "test_might_fail git rebase --abort" &&
-	test_when_finished "git checkout master" &&
+	test_when_finished "git checkout main" &&
 
 	git checkout -b some-squashes &&
 	git commit --allow-empty -m first &&
@@ -440,4 +476,12 @@ test_expect_success 'fixup a fixup' '
 	test XZWY = $(git show | tr -cd W-Z)
 '
 
+test_expect_success 'fixup does not clean up commit message' '
+	oneline="#818" &&
+	git commit --allow-empty -m "$oneline" &&
+	git commit --fixup HEAD --allow-empty &&
+	git -c commit.cleanup=strip rebase -ki --autosquash HEAD~2 &&
+	test "$oneline" = "$(git show -s --format=%s)"
+'
+
 test_done
diff --git a/t/t3416-rebase-onto-threedots.sh b/t/t3416-rebase-onto-threedots.sh
index 9c25484..f8c4ed7 100755
--- a/t/t3416-rebase-onto-threedots.sh
+++ b/t/t3416-rebase-onto-threedots.sh
@@ -2,17 +2,21 @@
 
 test_description='git rebase --onto A...B'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY/lib-rebase.sh"
 
-# Rebase only the tip commit of "topic" on merge base between "master"
-# and "topic".  Cannot do this for "side" with "master" because there
+# Rebase only the tip commit of "topic" on merge base between "main"
+# and "topic".  Cannot do this for "side" with "main" because there
 # is no single merge base.
 #
 #
 #	    F---G topic                             G'
 #	   /                                       /
-# A---B---C---D---E master      -->       A---B---C---D---E
+# A---B---C---D---E main        -->       A---B---C---D---E
 #      \   \ /
 #	\   x
 #	 \ / \
@@ -26,7 +30,7 @@ test_expect_success setup '
 	git branch topic &&
 	git checkout side &&
 	test_commit H &&
-	git checkout master &&
+	git checkout main &&
 	test_tick &&
 	git merge H &&
 	git tag D &&
@@ -42,83 +46,87 @@ test_expect_success setup '
 	test_commit K
 '
 
-test_expect_success 'rebase --onto master...topic' '
+test_expect_success 'rebase --onto main...topic' '
 	git reset --hard &&
 	git checkout topic &&
 	git reset --hard G &&
 
-	git rebase --onto master...topic F &&
+	git rebase --onto main...topic F &&
 	git rev-parse HEAD^1 >actual &&
 	git rev-parse C^0 >expect &&
 	test_cmp expect actual
 '
 
-test_expect_success 'rebase --onto master...' '
+test_expect_success 'rebase --onto main...' '
 	git reset --hard &&
 	git checkout topic &&
 	git reset --hard G &&
 
-	git rebase --onto master... F &&
+	git rebase --onto main... F &&
 	git rev-parse HEAD^1 >actual &&
 	git rev-parse C^0 >expect &&
 	test_cmp expect actual
 '
 
-test_expect_success 'rebase --onto master...side' '
+test_expect_success 'rebase --onto main...side' '
 	git reset --hard &&
 	git checkout side &&
 	git reset --hard K &&
 
-	test_must_fail git rebase --onto master...side J
+	test_must_fail git rebase --onto main...side J
 '
 
-test_expect_success 'rebase -i --onto master...topic' '
+test_expect_success 'rebase -i --onto main...topic' '
 	git reset --hard &&
 	git checkout topic &&
 	git reset --hard G &&
-	set_fake_editor &&
-	EXPECT_COUNT=1 git rebase -i --onto master...topic F &&
+	(
+		set_fake_editor &&
+		EXPECT_COUNT=1 git rebase -i --onto main...topic F
+	) &&
 	git rev-parse HEAD^1 >actual &&
 	git rev-parse C^0 >expect &&
 	test_cmp expect actual
 '
 
-test_expect_success 'rebase -i --onto master...' '
+test_expect_success 'rebase -i --onto main...' '
 	git reset --hard &&
 	git checkout topic &&
 	git reset --hard G &&
-	set_fake_editor &&
-	EXPECT_COUNT=1 git rebase -i --onto master... F &&
+	(
+		set_fake_editor &&
+		EXPECT_COUNT=1 git rebase -i --onto main... F
+	) &&
 	git rev-parse HEAD^1 >actual &&
 	git rev-parse C^0 >expect &&
 	test_cmp expect actual
 '
 
-test_expect_success 'rebase -i --onto master...side' '
+test_expect_success 'rebase --onto main...side requires a single merge-base' '
 	git reset --hard &&
 	git checkout side &&
 	git reset --hard K &&
 
-	set_fake_editor &&
-	test_must_fail git rebase -i --onto master...side J
+	test_must_fail git rebase -i --onto main...side J 2>err &&
+	grep "need exactly one merge base" err
 '
 
 test_expect_success 'rebase --keep-base --onto incompatible' '
-	test_must_fail git rebase --keep-base --onto master...
+	test_must_fail git rebase --keep-base --onto main...
 '
 
 test_expect_success 'rebase --keep-base --root incompatible' '
 	test_must_fail git rebase --keep-base --root
 '
 
-test_expect_success 'rebase --keep-base master from topic' '
+test_expect_success 'rebase --keep-base main from topic' '
 	git reset --hard &&
 	git checkout topic &&
 	git reset --hard G &&
 
-	git rebase --keep-base master &&
+	git rebase --keep-base main &&
 	git rev-parse C >base.expect &&
-	git merge-base master HEAD >base.actual &&
+	git merge-base main HEAD >base.actual &&
 	test_cmp base.expect base.actual &&
 
 	git rev-parse HEAD~2 >actual &&
@@ -126,23 +134,39 @@ test_expect_success 'rebase --keep-base master from topic' '
 	test_cmp expect actual
 '
 
-test_expect_success 'rebase --keep-base master from side' '
+test_expect_success 'rebase --keep-base main topic from main' '
+	git checkout main &&
+	git branch -f topic G &&
+
+	git rebase --keep-base main topic &&
+	git rev-parse C >base.expect &&
+	git merge-base main HEAD >base.actual &&
+	test_cmp base.expect base.actual &&
+
+	git rev-parse HEAD~2 >actual &&
+	git rev-parse C^0 >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'rebase --keep-base main from side' '
 	git reset --hard &&
 	git checkout side &&
 	git reset --hard K &&
 
-	test_must_fail git rebase --keep-base master
+	test_must_fail git rebase --keep-base main
 '
 
-test_expect_success 'rebase -i --keep-base master from topic' '
+test_expect_success 'rebase -i --keep-base main from topic' '
 	git reset --hard &&
 	git checkout topic &&
 	git reset --hard G &&
 
-	set_fake_editor &&
-	EXPECT_COUNT=2 git rebase -i --keep-base master &&
+	(
+		set_fake_editor &&
+		EXPECT_COUNT=2 git rebase -i --keep-base main
+	) &&
 	git rev-parse C >base.expect &&
-	git merge-base master HEAD >base.actual &&
+	git merge-base main HEAD >base.actual &&
 	test_cmp base.expect base.actual &&
 
 	git rev-parse HEAD~2 >actual &&
@@ -150,13 +174,56 @@ test_expect_success 'rebase -i --keep-base master from topic' '
 	test_cmp expect actual
 '
 
-test_expect_success 'rebase -i --keep-base master from side' '
+test_expect_success 'rebase -i --keep-base main topic from main' '
+	git checkout main &&
+	git branch -f topic G &&
+
+	(
+		set_fake_editor &&
+		EXPECT_COUNT=2 git rebase -i --keep-base main topic
+	) &&
+	git rev-parse C >base.expect &&
+	git merge-base main HEAD >base.actual &&
+	test_cmp base.expect base.actual &&
+
+	git rev-parse HEAD~2 >actual &&
+	git rev-parse C^0 >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'rebase --keep-base requires a single merge base' '
 	git reset --hard &&
 	git checkout side &&
 	git reset --hard K &&
 
-	set_fake_editor &&
-	test_must_fail git rebase -i --keep-base master
+	test_must_fail git rebase -i --keep-base main 2>err &&
+	grep "need exactly one merge base with branch" err
+'
+
+test_expect_success 'rebase --keep-base keeps cherry picks' '
+	git checkout -f -B main E &&
+	git cherry-pick F &&
+	(
+		set_fake_editor &&
+		EXPECT_COUNT=2 git rebase -i --keep-base HEAD G
+	) &&
+	test_cmp_rev HEAD G
+'
+
+test_expect_success 'rebase --keep-base --no-reapply-cherry-picks' '
+	git checkout -f -B main E &&
+	git cherry-pick F &&
+	(
+		set_fake_editor &&
+		EXPECT_COUNT=1 git rebase -i --keep-base \
+					--no-reapply-cherry-picks HEAD G
+	) &&
+	test_cmp_rev HEAD^ C
+'
+
+# This must be the last test in this file
+test_expect_success '$EDITOR and friends are unchanged' '
+	test_editor_unchanged
 '
 
 test_done
diff --git a/t/t3417-rebase-whitespace-fix.sh b/t/t3417-rebase-whitespace-fix.sh
index 946e92f..96f2cf2 100755
--- a/t/t3417-rebase-whitespace-fix.sh
+++ b/t/t3417-rebase-whitespace-fix.sh
@@ -115,9 +115,7 @@ test_expect_success 'at beginning of file' '
 	git config core.whitespace "blank-at-eol" &&
 	cp beginning file &&
 	git commit -m beginning file &&
-	for i in 1 2 3 4 5; do
-		echo $i
-	done >> file &&
+	test_write_lines 1 2 3 4 5 >>file &&
 	git commit -m more file &&
 	git rebase --whitespace=fix HEAD^^ &&
 	test_cmp expect-beginning file
diff --git a/t/t3418-rebase-continue.sh b/t/t3418-rebase-continue.sh
index 7a2da97..127216f 100755
--- a/t/t3418-rebase-continue.sh
+++ b/t/t3418-rebase-continue.sh
@@ -2,6 +2,9 @@
 
 test_description='git rebase --continue tests'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 . "$TEST_DIRECTORY"/lib-rebase.sh
@@ -15,25 +18,35 @@ test_expect_success 'setup' '
 	git checkout -b topic HEAD^ &&
 	test_commit "commit-new-file-F2-on-topic-branch" F2 22 &&
 
-	git checkout master
+	git checkout main
 '
 
-test_expect_success 'interactive rebase --continue works with touched file' '
+test_expect_success 'merge based rebase --continue with works with touched file' '
 	rm -fr .git/rebase-* &&
 	git reset --hard &&
-	git checkout master &&
+	git checkout main &&
 
 	FAKE_LINES="edit 1" git rebase -i HEAD^ &&
 	test-tool chmtime =-60 F1 &&
 	git rebase --continue
 '
 
-test_expect_success 'non-interactive rebase --continue works with touched file' '
+test_expect_success 'merge based rebase --continue removes .git/MERGE_MSG' '
+	git checkout -f --detach topic &&
+
+	test_must_fail git rebase --onto main HEAD^ &&
+	git read-tree --reset -u HEAD &&
+	test_path_is_file .git/MERGE_MSG &&
+	git rebase --continue &&
+	test_path_is_missing .git/MERGE_MSG
+'
+
+test_expect_success 'apply based rebase --continue works with touched file' '
 	rm -fr .git/rebase-* &&
 	git reset --hard &&
-	git checkout master &&
+	git checkout main &&
 
-	test_must_fail git rebase --onto master master topic &&
+	test_must_fail git rebase --apply --onto main main topic &&
 	echo "Resolved" >F2 &&
 	git add F2 &&
 	test-tool chmtime =-60 F1 &&
@@ -49,75 +62,39 @@ test_expect_success 'rebase --continue remembers merge strategy and options' '
 	rm -fr .git/rebase-* &&
 	git reset --hard commit-new-file-F2-on-topic-branch &&
 	test_commit "commit-new-file-F3-on-topic-branch" F3 32 &&
-	test_when_finished "rm -fr test-bin funny.was.run" &&
+	test_when_finished "rm -fr test-bin" &&
 	mkdir test-bin &&
-	cat >test-bin/git-merge-funny <<-EOF &&
-	#!$SHELL_PATH
-	case "\$1" in --opt) ;; *) exit 2 ;; esac
-	shift &&
-	>funny.was.run &&
-	exec git merge-recursive "\$@"
+
+	write_script test-bin/git-merge-funny <<-\EOF &&
+	printf "[%s]\n" $# "$1" "$2" "$3" "$5" >actual
+	shift 3 &&
+	exec git merge-recursive "$@"
 	EOF
-	chmod +x test-bin/git-merge-funny &&
-	(
-		PATH=./test-bin:$PATH &&
-		test_must_fail git rebase -s funny -Xopt master topic
-	) &&
-	test -f funny.was.run &&
-	rm funny.was.run &&
-	echo "Resolved" >F2 &&
-	git add F2 &&
-	(
-		PATH=./test-bin:$PATH &&
-		git rebase --continue
-	) &&
-	test -f funny.was.run
-'
 
-test_expect_success 'rebase -i --continue handles merge strategy and options' '
-	rm -fr .git/rebase-* &&
-	git reset --hard commit-new-file-F2-on-topic-branch &&
-	test_commit "commit-new-file-F3-on-topic-branch-for-dash-i" F3 32 &&
-	test_when_finished "rm -fr test-bin funny.was.run funny.args" &&
-	mkdir test-bin &&
-	cat >test-bin/git-merge-funny <<-EOF &&
-	#!$SHELL_PATH
-	echo "\$@" >>funny.args
-	case "\$1" in --opt) ;; *) exit 2 ;; esac
-	case "\$2" in --foo) ;; *) exit 2 ;; esac
-	case "\$4" in --) ;; *) exit 2 ;; esac
-	shift 2 &&
-	>funny.was.run &&
-	exec git merge-recursive "\$@"
+	cat >expect <<-\EOF &&
+	[7]
+	[--option=arg with space]
+	[--op"tion\]
+	[--new
+	line ]
+	[--]
 	EOF
-	chmod +x test-bin/git-merge-funny &&
+
+	rm -f actual &&
 	(
 		PATH=./test-bin:$PATH &&
-		test_must_fail git rebase -i -s funny -Xopt -Xfoo master topic
+		test_must_fail git rebase -s funny -X"option=arg with space" \
+				-Xop\"tion\\ -X"new${LF}line " main topic
 	) &&
-	test -f funny.was.run &&
-	rm funny.was.run &&
+	test_cmp expect actual &&
+	rm actual &&
 	echo "Resolved" >F2 &&
 	git add F2 &&
 	(
 		PATH=./test-bin:$PATH &&
 		git rebase --continue
 	) &&
-	test -f funny.was.run
-'
-
-test_expect_success REBASE_P 'rebase passes merge strategy options correctly' '
-	rm -fr .git/rebase-* &&
-	git reset --hard commit-new-file-F3-on-topic-branch &&
-	test_commit theirs-to-merge &&
-	git reset --hard HEAD^ &&
-	test_commit some-commit &&
-	test_tick &&
-	git merge --no-ff theirs-to-merge &&
-	FAKE_LINES="1 edit 2 3" git rebase -i -f -p -m \
-		-s recursive --strategy-option=theirs HEAD~2 &&
-	test_commit force-change &&
-	git rebase --continue
+	test_cmp expect actual
 '
 
 test_expect_success 'rebase -r passes merge strategy options correctly' '
@@ -138,15 +115,23 @@ test_expect_success '--skip after failed fixup cleans commit message' '
 	test_when_finished "test_might_fail git rebase --abort" &&
 	git checkout -b with-conflicting-fixup &&
 	test_commit wants-fixup &&
-	test_commit "fixup! wants-fixup" wants-fixup.t 1 wants-fixup-1 &&
-	test_commit "fixup! wants-fixup" wants-fixup.t 2 wants-fixup-2 &&
-	test_commit "fixup! wants-fixup" wants-fixup.t 3 wants-fixup-3 &&
+	test_commit "fixup 1" wants-fixup.t 1 wants-fixup-1 &&
+	test_commit "fixup 2" wants-fixup.t 2 wants-fixup-2 &&
+	test_commit "fixup 3" wants-fixup.t 3 wants-fixup-3 &&
 	test_must_fail env FAKE_LINES="1 fixup 2 squash 4" \
 		git rebase -i HEAD~4 &&
 
 	: now there is a conflict, and comments in the commit message &&
-	git show HEAD >out &&
-	grep "fixup! wants-fixup" out &&
+	test_commit_message HEAD <<-\EOF &&
+	# This is a combination of 2 commits.
+	# This is the 1st commit message:
+
+	wants-fixup
+
+	# The commit message #2 will be skipped:
+
+	# fixup 1
+	EOF
 
 	: skip and continue &&
 	echo "cp \"\$1\" .git/copy.txt" | write_script copy-editor.sh &&
@@ -156,43 +141,59 @@ test_expect_success '--skip after failed fixup cleans commit message' '
 	test_path_is_missing .git/copy.txt &&
 
 	: now the comments in the commit message should have been cleaned up &&
-	git show HEAD >out &&
-	! grep "fixup! wants-fixup" out &&
+	test_commit_message HEAD -m wants-fixup &&
 
 	: now, let us ensure that "squash" is handled correctly &&
 	git reset --hard wants-fixup-3 &&
-	test_must_fail env FAKE_LINES="1 squash 4 squash 2 squash 4" \
+	test_must_fail env FAKE_LINES="1 squash 2 squash 1 squash 3 squash 1" \
 		git rebase -i HEAD~4 &&
 
-	: the first squash failed, but there are two more in the chain &&
+	: the second squash failed, but there are two more in the chain &&
 	(test_set_editor "$PWD/copy-editor.sh" &&
 	 test_must_fail git rebase --skip) &&
 
 	: not the final squash, no need to edit the commit message &&
 	test_path_is_missing .git/copy.txt &&
 
-	: The first squash was skipped, therefore: &&
-	git show HEAD >out &&
-	test_i18ngrep "# This is a combination of 2 commits" out &&
-	test_i18ngrep "# This is the commit message #2:" out &&
+	: The first and third squashes succeeded, therefore: &&
+	test_commit_message HEAD <<-\EOF &&
+	# This is a combination of 3 commits.
+	# This is the 1st commit message:
+
+	wants-fixup
+
+	# This is the commit message #2:
+
+	fixup 1
+
+	# This is the commit message #3:
+
+	fixup 2
+	EOF
 
 	(test_set_editor "$PWD/copy-editor.sh" && git rebase --skip) &&
-	git show HEAD >out &&
-	test_i18ngrep ! "# This is a combination" out &&
+	test_commit_message HEAD <<-\EOF &&
+	wants-fixup
+
+	fixup 1
+
+	fixup 2
+	EOF
 
 	: Final squash failed, but there was still a squash &&
-	test_i18ngrep "# This is a combination of 2 commits" .git/copy.txt &&
-	test_i18ngrep "# This is the commit message #2:" .git/copy.txt
+	head -n1 .git/copy.txt >first-line &&
+	test_grep "# This is a combination of 3 commits" first-line &&
+	test_grep "# This is the commit message #3:" .git/copy.txt
 '
 
 test_expect_success 'setup rerere database' '
 	rm -fr .git/rebase-* &&
 	git reset --hard commit-new-file-F3-on-topic-branch &&
-	git checkout master &&
+	git checkout main &&
 	test_commit "commit-new-file-F3" F3 3 &&
 	test_config rerere.enabled true &&
 	git update-ref refs/heads/topic commit-new-file-F3-on-topic-branch &&
-	test_must_fail git rebase -m master topic &&
+	test_must_fail git rebase -m main topic &&
 	echo "Resolved" >F2 &&
 	cp F2 expected-F2 &&
 	git add F2 &&
@@ -207,7 +208,7 @@ test_expect_success 'setup rerere database' '
 prepare () {
 	rm -fr .git/rebase-* &&
 	git reset --hard commit-new-file-F3-on-topic-branch &&
-	git checkout master &&
+	git checkout main &&
 	test_config rerere.enabled true
 }
 
@@ -215,7 +216,7 @@ test_rerere_autoupdate () {
 	action=$1 &&
 	test_expect_success "rebase $action --continue remembers --rerere-autoupdate" '
 		prepare &&
-		test_must_fail git rebase $action --rerere-autoupdate master topic &&
+		test_must_fail git rebase $action --rerere-autoupdate main topic &&
 		test_cmp expected-F2 F2 &&
 		git diff-files --quiet &&
 		test_must_fail git rebase --continue &&
@@ -227,7 +228,7 @@ test_rerere_autoupdate () {
 	test_expect_success "rebase $action --continue honors rerere.autoUpdate" '
 		prepare &&
 		test_config rerere.autoupdate true &&
-		test_must_fail git rebase $action master topic &&
+		test_must_fail git rebase $action main topic &&
 		test_cmp expected-F2 F2 &&
 		git diff-files --quiet &&
 		test_must_fail git rebase --continue &&
@@ -239,7 +240,7 @@ test_rerere_autoupdate () {
 	test_expect_success "rebase $action --continue remembers --no-rerere-autoupdate" '
 		prepare &&
 		test_config rerere.autoupdate true &&
-		test_must_fail git rebase $action --no-rerere-autoupdate master topic &&
+		test_must_fail git rebase $action --no-rerere-autoupdate main topic &&
 		test_cmp expected-F2 F2 &&
 		test_must_fail git diff-files --quiet &&
 		git add F2 &&
@@ -251,11 +252,10 @@ test_rerere_autoupdate () {
 	'
 }
 
-test_rerere_autoupdate
+test_rerere_autoupdate --apply
 test_rerere_autoupdate -m
 GIT_SEQUENCE_EDITOR=: && export GIT_SEQUENCE_EDITOR
 test_rerere_autoupdate -i
-test_have_prereq !REBASE_P || test_rerere_autoupdate --preserve-merges
 unset GIT_SEQUENCE_EDITOR
 
 test_expect_success 'the todo command "break" works' '
@@ -268,6 +268,24 @@ test_expect_success 'the todo command "break" works' '
 	test_path_is_file execed
 '
 
+test_expect_success 'patch file is removed before break command' '
+	test_when_finished "git rebase --abort" &&
+	cat >todo <<-\EOF &&
+	pick commit-new-file-F2-on-topic-branch
+	break
+	EOF
+
+	(
+		set_replace_editor todo &&
+		test_must_fail git rebase -i --onto commit-new-file-F2 HEAD
+	) &&
+	test_path_is_file .git/rebase-merge/patch &&
+	echo 22>F2 &&
+	git add F2 &&
+	git rebase --continue &&
+	test_path_is_missing .git/rebase-merge/patch
+'
+
 test_expect_success '--reschedule-failed-exec' '
 	test_when_finished "git rebase --abort" &&
 	test_must_fail git rebase -x false --reschedule-failed-exec HEAD^ &&
@@ -276,15 +294,64 @@ test_expect_success '--reschedule-failed-exec' '
 	test_must_fail git -c rebase.rescheduleFailedExec=true \
 		rebase -x false HEAD^ 2>err &&
 	grep "^exec false" .git/rebase-merge/git-rebase-todo &&
-	test_i18ngrep "has been rescheduled" err
+	test_grep "has been rescheduled" err
 '
 
-test_expect_success 'rebase.reschedulefailedexec only affects `rebase -i`' '
-	test_config rebase.reschedulefailedexec true &&
+test_expect_success 'rebase.rescheduleFailedExec only affects `rebase -i`' '
+	test_config rebase.rescheduleFailedExec true &&
 	test_must_fail git rebase -x false HEAD^ &&
 	grep "^exec false" .git/rebase-merge/git-rebase-todo &&
 	git rebase --abort &&
 	git rebase HEAD^
 '
 
+test_expect_success 'rebase.rescheduleFailedExec=true & --no-reschedule-failed-exec' '
+	test_when_finished "git rebase --abort" &&
+	test_config rebase.rescheduleFailedExec true &&
+	test_must_fail git rebase -x false --no-reschedule-failed-exec HEAD~2 &&
+	test_must_fail git rebase --continue 2>err &&
+	! grep "has been rescheduled" err
+'
+
+test_expect_success 'new rebase.rescheduleFailedExec=true setting in an ongoing rebase is ignored' '
+	test_when_finished "git rebase --abort" &&
+	test_must_fail git rebase -x false HEAD~2 &&
+	test_config rebase.rescheduleFailedExec true &&
+	test_must_fail git rebase --continue 2>err &&
+	! grep "has been rescheduled" err
+'
+
+test_expect_success 'there is no --no-reschedule-failed-exec in an ongoing rebase' '
+	test_when_finished "git rebase --abort" &&
+	test_must_fail git rebase -x false HEAD~2 &&
+	test_expect_code 129 git rebase --continue --no-reschedule-failed-exec &&
+	test_expect_code 129 git rebase --edit-todo --no-reschedule-failed-exec
+'
+
+test_orig_head_helper () {
+	test_when_finished 'git rebase --abort &&
+		git checkout topic &&
+		git reset --hard commit-new-file-F2-on-topic-branch' &&
+	git update-ref -d ORIG_HEAD &&
+	test_must_fail git rebase "$@" &&
+	test_cmp_rev ORIG_HEAD commit-new-file-F2-on-topic-branch
+}
+
+test_orig_head () {
+	type=$1
+	test_expect_success "rebase $type sets ORIG_HEAD correctly" '
+		git checkout topic &&
+		git reset --hard commit-new-file-F2-on-topic-branch &&
+		test_orig_head_helper $type main
+	'
+
+	test_expect_success "rebase $type <upstream> <branch> sets ORIG_HEAD correctly" '
+		git checkout main &&
+		test_orig_head_helper $type main topic
+	'
+}
+
+test_orig_head --apply
+test_orig_head --merge
+
 test_done
diff --git a/t/t3419-rebase-patch-id.sh b/t/t3419-rebase-patch-id.sh
index 1f32faa..6c61f24 100755
--- a/t/t3419-rebase-patch-id.sh
+++ b/t/t3419-rebase-patch-id.sh
@@ -2,6 +2,10 @@
 
 test_description='git rebase - test patch id computation'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 scramble () {
@@ -24,7 +28,7 @@ test_expect_success 'setup' '
 
 test_expect_success 'setup: 500 lines' '
 	rm -f .gitattributes &&
-	git checkout -q -f master &&
+	git checkout -q -f main &&
 	git reset --hard root &&
 	test_seq 500 >file &&
 	git add file &&
@@ -40,32 +44,75 @@ test_expect_success 'setup: 500 lines' '
 	git add newfile &&
 	git commit -q -m "add small file" &&
 
-	git cherry-pick master >/dev/null 2>&1
-'
+	git cherry-pick main >/dev/null 2>&1 &&
+
+	git branch -f squashed main &&
+	git checkout -q -f squashed &&
+	git reset -q --soft HEAD~2 &&
+	git commit -q -m squashed &&
 
-test_expect_success 'setup attributes' '
-	echo "file binary" >.gitattributes
+	git branch -f mode main &&
+	git checkout -q -f mode &&
+	test_chmod +x file &&
+	git commit -q -a --amend &&
+
+	git branch -f modeother other &&
+	git checkout -q -f modeother &&
+	test_chmod +x file &&
+	git commit -q -a --amend
 '
 
 test_expect_success 'detect upstream patch' '
-	git checkout -q master &&
+	git checkout -q main^{} &&
 	scramble file &&
 	git add file &&
 	git commit -q -m "change big file again" &&
 	git checkout -q other^{} &&
-	git rebase master &&
-	git rev-list master...HEAD~ >revs &&
+	git rebase main &&
+	git rev-list main...HEAD~ >revs &&
+	test_must_be_empty revs
+'
+
+test_expect_success 'detect upstream patch binary' '
+	echo "file binary" >.gitattributes &&
+	git checkout -q other^{} &&
+	git rebase main &&
+	git rev-list main...HEAD~ >revs &&
+	test_must_be_empty revs &&
+	test_when_finished "rm .gitattributes"
+'
+
+test_expect_success 'detect upstream patch modechange' '
+	git checkout -q modeother^{} &&
+	git rebase mode &&
+	git rev-list mode...HEAD~ >revs &&
 	test_must_be_empty revs
 '
 
 test_expect_success 'do not drop patch' '
-	git branch -f squashed master &&
-	git checkout -q -f squashed &&
-	git reset -q --soft HEAD~2 &&
-	git commit -q -m squashed &&
 	git checkout -q other^{} &&
 	test_must_fail git rebase squashed &&
-	git rebase --quit
+	test_when_finished "git rebase --abort"
+'
+
+test_expect_success 'do not drop patch binary' '
+	echo "file binary" >.gitattributes &&
+	git checkout -q other^{} &&
+	test_must_fail git rebase squashed &&
+	test_when_finished "git rebase --abort" &&
+	test_when_finished "rm .gitattributes"
+'
+
+test_expect_success 'do not drop patch modechange' '
+	git checkout -q modeother^{} &&
+	git rebase other &&
+	cat >expected <<-\EOF &&
+	diff --git a/file b/file
+	old mode 100644
+	new mode 100755
+	EOF
+	git diff HEAD~ >modediff &&
+	test_cmp expected modediff
 '
 
 test_done
diff --git a/t/t3420-rebase-autostash.sh b/t/t3420-rebase-autostash.sh
index ca33173..1a820f1 100755
--- a/t/t3420-rebase-autostash.sh
+++ b/t/t3420-rebase-autostash.sh
@@ -4,6 +4,9 @@
 #
 
 test_description='git rebase --autostash tests'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -21,12 +24,12 @@ test_expect_success setup '
 	git add . &&
 	test_tick &&
 	git commit -m "third commit" &&
-	git checkout -b unrelated-onto-branch master &&
+	git checkout -b unrelated-onto-branch main &&
 	echo unrelated >file4 &&
 	git add . &&
 	test_tick &&
 	git commit -m "unrelated commit" &&
-	git checkout -b related-onto-branch master &&
+	git checkout -b related-onto-branch main &&
 	echo conflicting-change >file2 &&
 	git add . &&
 	test_tick &&
@@ -107,7 +110,7 @@ testrebase () {
 		fi &&
 		create_expected_success_$suffix &&
 		sed "$remove_progress_re" <actual >actual2 &&
-		test_i18ncmp expected actual2
+		test_cmp expected actual2
 	'
 
 	test_expect_success "rebase$type: dirty index, non-conflicting rebase" '
@@ -228,7 +231,7 @@ testrebase () {
 		fi &&
 		create_expected_failure_$suffix &&
 		sed "$remove_progress_re" <actual >actual2 &&
-		test_i18ncmp expected actual2
+		test_cmp expected actual2
 	'
 }
 
@@ -305,9 +308,9 @@ test_expect_success 'autostash is saved on editor failure with conflict' '
 '
 
 test_expect_success 'autostash with dirty submodules' '
-	test_when_finished "git reset --hard && git checkout master" &&
+	test_when_finished "git reset --hard && git checkout main" &&
 	git checkout -b with-submodule &&
-	git submodule add ./ sub &&
+	git -c protocol.file.allow=always submodule add ./ sub &&
 	test_tick &&
 	git commit -m add-submodule &&
 	echo changed >sub/file0 &&
@@ -324,10 +327,20 @@ test_expect_success 'branch is left alone when possible' '
 
 test_expect_success 'never change active branch' '
 	git checkout -b not-the-feature-branch unrelated-onto-branch &&
-	test_when_finished "git reset --hard && git checkout master" &&
+	test_when_finished "git reset --hard && git checkout main" &&
 	echo changed >file0 &&
 	git rebase --autostash not-the-feature-branch feature-branch &&
 	test_cmp_rev not-the-feature-branch unrelated-onto-branch
 '
 
+test_expect_success 'autostash commit is marked as reachable' '
+	echo changed >file0 &&
+	git rebase --autostash --exec "git prune --expire=now" \
+		feature-branch^ feature-branch &&
+	# git rebase succeeds if the stash cannot be applied so we need to check
+	# the contents of file0
+	echo changed >expect &&
+	test_cmp expect file0
+'
+
 test_done
diff --git a/t/t3421-rebase-topology-linear.sh b/t/t3421-rebase-topology-linear.sh
index 4a9204b..62d86d5 100755
--- a/t/t3421-rebase-topology-linear.sh
+++ b/t/t3421-rebase-topology-linear.sh
@@ -29,7 +29,6 @@ test_run_rebase () {
 test_run_rebase success --apply
 test_run_rebase success -m
 test_run_rebase success -i
-test_have_prereq !REBASE_P || test_run_rebase success -p
 
 test_expect_success 'setup branches and remote tracking' '
 	git tag -l >tags &&
@@ -53,7 +52,6 @@ test_run_rebase () {
 test_run_rebase success --apply
 test_run_rebase success -m
 test_run_rebase success -i
-test_have_prereq !REBASE_P || test_run_rebase success -p
 
 test_run_rebase () {
 	result=$1
@@ -70,7 +68,6 @@ test_run_rebase success --apply
 test_run_rebase success --fork-point
 test_run_rebase success -m
 test_run_rebase success -i
-test_have_prereq !REBASE_P || test_run_rebase failure -p
 
 test_run_rebase () {
 	result=$1
@@ -87,7 +84,6 @@ test_run_rebase success --apply
 test_run_rebase success --fork-point
 test_run_rebase success -m
 test_run_rebase success -i
-test_have_prereq !REBASE_P || test_run_rebase success -p
 
 test_run_rebase () {
 	result=$1
@@ -102,7 +98,6 @@ test_run_rebase success --apply
 test_run_rebase success --fork-point
 test_run_rebase success -m
 test_run_rebase success -i
-test_have_prereq !REBASE_P || test_run_rebase success -p
 
 #       f
 #      /
@@ -142,7 +137,6 @@ test_run_rebase () {
 test_run_rebase success --apply
 test_run_rebase success -m
 test_run_rebase success -i
-test_have_prereq !REBASE_P || test_run_rebase success -p
 
 test_run_rebase () {
 	result=$1
@@ -157,7 +151,6 @@ test_run_rebase () {
 test_run_rebase success --apply
 test_run_rebase success -m
 test_run_rebase success -i
-test_have_prereq !REBASE_P || test_run_rebase success -p
 
 test_run_rebase () {
 	result=$1
@@ -172,7 +165,6 @@ test_run_rebase () {
 test_run_rebase success --apply
 test_run_rebase success -m
 test_run_rebase success -i
-test_have_prereq !REBASE_P || test_run_rebase success -p
 
 test_run_rebase () {
 	result=$1
@@ -187,7 +179,6 @@ test_run_rebase () {
 test_run_rebase success --apply
 test_run_rebase success -m
 test_run_rebase success -i
-test_have_prereq !REBASE_P || test_run_rebase success -p
 
 # a---b---c---j!
 #      \
@@ -215,7 +206,6 @@ test_run_rebase () {
 test_run_rebase failure --apply
 test_run_rebase success -m
 test_run_rebase success -i
-test_have_prereq !REBASE_P || test_run_rebase failure -p
 
 test_run_rebase () {
 	result=$1
@@ -229,7 +219,6 @@ test_run_rebase () {
 }
 test_run_rebase success -m
 test_run_rebase success -i
-test_have_prereq !REBASE_P || test_run_rebase success -p
 
 test_run_rebase () {
 	result=$1
@@ -243,7 +232,6 @@ test_run_rebase () {
 }
 test_run_rebase success -m
 test_run_rebase success -i
-test_have_prereq !REBASE_P || test_run_rebase success -p
 test_run_rebase success --rebase-merges
 
 #       m
@@ -283,7 +271,6 @@ test_run_rebase () {
 test_run_rebase success --apply
 test_run_rebase success -m
 test_run_rebase success -i
-test_have_prereq !REBASE_P || test_run_rebase success -p
 
 test_run_rebase () {
 	result=$1
@@ -298,7 +285,6 @@ test_run_rebase () {
 test_run_rebase success --apply
 test_run_rebase success -m
 test_run_rebase success -i
-test_have_prereq !REBASE_P || test_run_rebase failure -p
 
 test_run_rebase () {
 	result=$1
@@ -313,7 +299,6 @@ test_run_rebase () {
 test_run_rebase success --apply
 test_run_rebase success -m
 test_run_rebase success -i
-test_have_prereq !REBASE_P || test_run_rebase success -p
 
 test_run_rebase () {
 	result=$1
@@ -329,7 +314,6 @@ test_run_rebase () {
 test_run_rebase success --apply
 test_run_rebase success -m
 test_run_rebase success -i
-test_have_prereq !REBASE_P || test_run_rebase failure -p
 
 test_run_rebase () {
 	result=$1
@@ -344,7 +328,6 @@ test_run_rebase () {
 test_run_rebase success --apply
 test_run_rebase success -m
 test_run_rebase success -i
-test_have_prereq !REBASE_P || test_run_rebase failure -p
 
 test_run_rebase () {
 	result=$1
@@ -358,7 +341,6 @@ test_run_rebase () {
 test_run_rebase success ''
 test_run_rebase success -m
 test_run_rebase success -i
-test_have_prereq !REBASE_P || test_run_rebase failure -p
 
 test_run_rebase () {
 	result=$1
@@ -373,6 +355,5 @@ test_run_rebase () {
 test_run_rebase success ''
 test_run_rebase success -m
 test_run_rebase success -i
-test_have_prereq !REBASE_P || test_run_rebase success -p
 
 test_done
diff --git a/t/t3422-rebase-incompatible-options.sh b/t/t3422-rebase-incompatible-options.sh
index 50e7960..b40f262 100755
--- a/t/t3422-rebase-incompatible-options.sh
+++ b/t/t3422-rebase-incompatible-options.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='test if rebase detects and aborts on incompatible options'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -23,11 +25,11 @@ test_expect_success 'setup' '
 '
 
 #
-# Rebase has lots of useful options like --whitepsace=fix, which are
-# actually all built in terms of flags to git-am.  Since neither
-# --merge nor --interactive (nor any options that imply those two) use
-# git-am, using them together will result in flags like --whitespace=fix
-# being ignored.  Make sure rebase warns the user and aborts instead.
+# Rebase has a couple options which are specific to the apply backend,
+# and several options which are specific to the merge backend.  Flags
+# from the different sets cannot work together, and we do not want to
+# just ignore one of the sets of flags.  Make sure rebase warns the
+# user and aborts instead.
 #
 
 test_rebase_am_only () {
@@ -48,6 +50,11 @@ test_rebase_am_only () {
 		test_must_fail git rebase $opt --strategy-option=ours A
 	"
 
+	test_expect_success "$opt incompatible with --autosquash" "
+		git checkout B^0 &&
+		test_must_fail git rebase $opt --autosquash A
+	"
+
 	test_expect_success "$opt incompatible with --interactive" "
 		git checkout B^0 &&
 		test_must_fail git rebase $opt --interactive A
@@ -58,22 +65,70 @@ test_rebase_am_only () {
 		test_must_fail git rebase $opt --exec 'true' A
 	"
 
+	test_expect_success "$opt incompatible with --keep-empty" "
+		git checkout B^0 &&
+		test_must_fail git rebase $opt --keep-empty A
+	"
+
+	test_expect_success "$opt incompatible with --empty=..." "
+		git checkout B^0 &&
+		test_must_fail git rebase $opt --empty=ask A
+	"
+
+	test_expect_success "$opt incompatible with --no-reapply-cherry-picks" "
+		git checkout B^0 &&
+		test_must_fail git rebase $opt --no-reapply-cherry-picks A
+	"
+
+	test_expect_success "$opt incompatible with --reapply-cherry-picks" "
+		git checkout B^0 &&
+		test_must_fail git rebase $opt --reapply-cherry-picks A
+	"
+
+	test_expect_success "$opt incompatible with --rebase-merges" "
+		git checkout B^0 &&
+		test_must_fail git rebase $opt --rebase-merges A
+	"
+
+	test_expect_success "$opt incompatible with --update-refs" "
+		git checkout B^0 &&
+		test_must_fail git rebase $opt --update-refs A
+	"
+
+	test_expect_success "$opt incompatible with --root without --onto" "
+		git checkout B^0 &&
+		test_must_fail git rebase $opt --root A
+	"
+
+	test_expect_success "$opt incompatible with rebase.rebaseMerges" "
+		git checkout B^0 &&
+		test_must_fail git -c rebase.rebaseMerges=true rebase $opt A 2>err &&
+		grep -e --no-rebase-merges err
+	"
+
+	test_expect_success "$opt incompatible with rebase.updateRefs" "
+		git checkout B^0 &&
+		test_must_fail git -c rebase.updateRefs=true rebase $opt A 2>err &&
+		grep -e --no-update-refs err
+	"
+
+	test_expect_success "$opt okay with overridden rebase.rebaseMerges" "
+		test_when_finished \"git reset --hard B^0\" &&
+		git checkout B^0 &&
+		git -c rebase.rebaseMerges=true rebase --no-rebase-merges $opt A
+	"
+
+	test_expect_success "$opt okay with overridden rebase.updateRefs" "
+		test_when_finished \"git reset --hard B^0\" &&
+		git checkout B^0 &&
+		git -c rebase.updateRefs=true rebase --no-update-refs $opt A
+	"
 }
 
+# Check options which imply --apply
 test_rebase_am_only --whitespace=fix
-test_rebase_am_only --ignore-whitespace
-test_rebase_am_only --committer-date-is-author-date
 test_rebase_am_only -C4
-
-test_expect_success REBASE_P '--preserve-merges incompatible with --signoff' '
-	git checkout B^0 &&
-	test_must_fail git rebase --preserve-merges --signoff A
-'
-
-test_expect_success REBASE_P \
-	'--preserve-merges incompatible with --rebase-merges' '
-	git checkout B^0 &&
-	test_must_fail git rebase --preserve-merges --rebase-merges A
-'
+# Also check an explicit --apply
+test_rebase_am_only --apply
 
 test_done
diff --git a/t/t3423-rebase-reword.sh b/t/t3423-rebase-reword.sh
index 6963750..2fab703 100755
--- a/t/t3423-rebase-reword.sh
+++ b/t/t3423-rebase-reword.sh
@@ -2,12 +2,13 @@
 
 test_description='git rebase interactive with rewording'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 . "$TEST_DIRECTORY"/lib-rebase.sh
 
 test_expect_success 'setup' '
-	test_commit master file-1 test &&
+	test_commit main file-1 test &&
 
 	git checkout -b stuff &&
 
@@ -22,7 +23,7 @@ test_expect_success 'reword without issues functions as intended' '
 
 	set_fake_editor &&
 	FAKE_LINES="pick 1 reword 2" FAKE_COMMIT_MESSAGE="feature_b_reworded" \
-		git rebase -i -v master &&
+		git rebase -i -v main &&
 
 	test "$(git log -1 --format=%B)" = "feature_b_reworded" &&
 	test $(git rev-list --count HEAD) = 3
@@ -35,7 +36,7 @@ test_expect_success 'reword after a conflict preserves commit' '
 
 	set_fake_editor &&
 	test_must_fail env FAKE_LINES="reword 2" \
-		git rebase -i -v master &&
+		git rebase -i -v main &&
 
 	git checkout --theirs file-2 &&
 	git add file-2 &&
diff --git a/t/t3424-rebase-empty.sh b/t/t3424-rebase-empty.sh
index 5e1045a..1ee6b00 100755
--- a/t/t3424-rebase-empty.sh
+++ b/t/t3424-rebase-empty.sh
@@ -72,6 +72,17 @@ test_expect_success 'rebase --merge --empty=keep' '
 	test_cmp expect actual
 '
 
+test_expect_success 'rebase --merge --empty=stop' '
+	git checkout -B testing localmods &&
+	test_must_fail git rebase --merge --empty=stop upstream &&
+
+	git rebase --skip &&
+
+	test_write_lines D C B A >expect &&
+	git log --format=%s >actual &&
+	test_cmp expect actual
+'
+
 test_expect_success 'rebase --merge --empty=ask' '
 	git checkout -B testing localmods &&
 	test_must_fail git rebase --merge --empty=ask upstream &&
@@ -101,9 +112,9 @@ test_expect_success 'rebase --interactive --empty=keep' '
 	test_cmp expect actual
 '
 
-test_expect_success 'rebase --interactive --empty=ask' '
+test_expect_success 'rebase --interactive --empty=stop' '
 	git checkout -B testing localmods &&
-	test_must_fail git rebase --interactive --empty=ask upstream &&
+	test_must_fail git rebase --interactive --empty=stop upstream &&
 
 	git rebase --skip &&
 
@@ -112,7 +123,7 @@ test_expect_success 'rebase --interactive --empty=ask' '
 	test_cmp expect actual
 '
 
-test_expect_success 'rebase --interactive uses default of --empty=ask' '
+test_expect_success 'rebase --interactive uses default of --empty=stop' '
 	git checkout -B testing localmods &&
 	test_must_fail git rebase --interactive upstream &&
 
@@ -167,4 +178,42 @@ test_expect_success 'rebase --merge does not leave state laying around' '
 	test_path_is_missing .git/MERGE_MSG
 '
 
+test_expect_success 'rebase --exec --empty=drop' '
+	git checkout -B testing localmods &&
+	git rebase --exec "true" --empty=drop upstream &&
+
+	test_write_lines D C B A >expect &&
+	git log --format=%s >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'rebase --exec --empty=keep' '
+	git checkout -B testing localmods &&
+	git rebase --exec "true" --empty=keep upstream &&
+
+	test_write_lines D C2 C B A >expect &&
+	git log --format=%s >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'rebase --exec uses default of --empty=keep' '
+	git checkout -B testing localmods &&
+	git rebase --exec "true" upstream &&
+
+	test_write_lines D C2 C B A >expect &&
+	git log --format=%s >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'rebase --exec --empty=stop' '
+	git checkout -B testing localmods &&
+	test_must_fail git rebase --exec "true" --empty=stop upstream &&
+
+	git rebase --skip &&
+
+	test_write_lines D C B A >expect &&
+	git log --format=%s >actual &&
+	test_cmp expect actual
+'
+
 test_done
diff --git a/t/t3425-rebase-topology-merges.sh b/t/t3425-rebase-topology-merges.sh
index e42faa4..a16428b 100755
--- a/t/t3425-rebase-topology-merges.sh
+++ b/t/t3425-rebase-topology-merges.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='rebase topology tests with merges'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-rebase.sh
 
@@ -106,155 +108,4 @@ test_run_rebase success 'd n o e' --apply
 test_run_rebase success 'd n o e' -m
 test_run_rebase success 'd n o e' -i
 
-if ! test_have_prereq REBASE_P; then
-	skip_all='skipping git rebase -p tests, as asked for'
-	test_done
-fi
-
-test_expect_success "rebase -p is no-op in non-linear history" "
-	reset_rebase &&
-	git rebase -p d w &&
-	test_cmp_rev w HEAD
-"
-
-test_expect_success "rebase -p is no-op when base inside second parent" "
-	reset_rebase &&
-	git rebase -p e w &&
-	test_cmp_rev w HEAD
-"
-
-test_expect_failure "rebase -p --root on non-linear history is a no-op" "
-	reset_rebase &&
-	git rebase -p --root w &&
-	test_cmp_rev w HEAD
-"
-
-test_expect_success "rebase -p re-creates merge from side branch" "
-	reset_rebase &&
-	git rebase -p z w &&
-	test_cmp_rev z HEAD^ &&
-	test_cmp_rev w^2 HEAD^2
-"
-
-test_expect_success "rebase -p re-creates internal merge" "
-	reset_rebase &&
-	git rebase -p c w &&
-	test_cmp_rev c HEAD~4 &&
-	test_cmp_rev HEAD^2^ HEAD~3 &&
-	test_revision_subjects 'd n e o w' HEAD~3 HEAD~2 HEAD^2 HEAD^ HEAD
-"
-
-test_expect_success "rebase -p can re-create two branches on onto" "
-	reset_rebase &&
-	git rebase -p --onto c d w &&
-	test_cmp_rev c HEAD~3 &&
-	test_cmp_rev c HEAD^2^ &&
-	test_revision_subjects 'n e o w' HEAD~2 HEAD^2 HEAD^ HEAD
-"
-
-#       f
-#      /
-# a---b---c---g---h
-#      \
-#       d---gp--i
-#        \       \
-#         e-------u
-#
-# gp = cherry-picked g
-# h = reverted g
-test_expect_success 'setup of non-linear-history for patch-equivalence tests' '
-	git checkout e &&
-	test_merge u i
-'
-
-test_expect_success "rebase -p re-creates history around dropped commit matching upstream" "
-	reset_rebase &&
-	git rebase -p h u &&
-	test_cmp_rev h HEAD~3 &&
-	test_cmp_rev HEAD^2^ HEAD~2 &&
-	test_revision_subjects 'd i e u' HEAD~2 HEAD^2 HEAD^ HEAD
-"
-
-test_expect_success "rebase -p --onto in merged history drops patches in upstream" "
-	reset_rebase &&
-	git rebase -p --onto f h u &&
-	test_cmp_rev f HEAD~3 &&
-	test_cmp_rev HEAD^2^ HEAD~2 &&
-	test_revision_subjects 'd i e u' HEAD~2 HEAD^2 HEAD^ HEAD
-"
-
-test_expect_success "rebase -p --onto in merged history does not drop patches in onto" "
-	reset_rebase &&
-	git rebase -p --onto h f u &&
-	test_cmp_rev h HEAD~3 &&
-	test_cmp_rev HEAD^2~2 HEAD~2 &&
-	test_revision_subjects 'd gp i e u' HEAD~2 HEAD^2^ HEAD^2 HEAD^ HEAD
-"
-
-# a---b---c---g---h
-#      \
-#       d---gp--s
-#        \   \ /
-#         \   X
-#          \ / \
-#           e---t
-#
-# gp = cherry-picked g
-# h = reverted g
-test_expect_success 'setup of non-linear-history for dropping whole side' '
-	git checkout gp &&
-	test_merge s e &&
-	git checkout e &&
-	test_merge t gp
-'
-
-test_expect_failure "rebase -p drops merge commit when entire first-parent side is dropped" "
-	reset_rebase &&
-	git rebase -p h s &&
-	test_cmp_rev h HEAD~2 &&
-	test_linear_range 'd e' h..
-"
-
-test_expect_success "rebase -p drops merge commit when entire second-parent side is dropped" "
-	reset_rebase &&
-	git rebase -p h t &&
-	test_cmp_rev h HEAD~2 &&
-	test_linear_range 'd e' h..
-"
-
-# a---b---c
-#      \
-#       d---e
-#        \   \
-#         n---r
-#          \
-#           o
-#
-# r = tree-same with n
-test_expect_success 'setup of non-linear-history for empty commits' '
-	git checkout n &&
-	git merge --no-commit e &&
-	git reset n . &&
-	git commit -m r &&
-	git reset --hard &&
-	git clean -f &&
-	git tag r
-'
-
-test_expect_success "rebase -p re-creates empty internal merge commit" "
-	reset_rebase &&
-	git rebase -p c r &&
-	test_cmp_rev c HEAD~3 &&
-	test_cmp_rev HEAD^2^ HEAD~2 &&
-	test_revision_subjects 'd e n r' HEAD~2 HEAD^2 HEAD^ HEAD
-"
-
-test_expect_success "rebase -p re-creates empty merge commit" "
-	reset_rebase &&
-	git rebase -p o r &&
-	test_cmp_rev e HEAD^2 &&
-	test_cmp_rev o HEAD^ &&
-	test_revision_subjects 'r' HEAD
-"
-
 test_done
diff --git a/t/t3426-rebase-submodule.sh b/t/t3426-rebase-submodule.sh
index 0ad3a07..ba069dc 100755
--- a/t/t3426-rebase-submodule.sh
+++ b/t/t3426-rebase-submodule.sh
@@ -35,6 +35,7 @@ git_rebase_interactive () {
 	ls -1pR * >>actual &&
 	test_cmp expect actual &&
 	set_fake_editor &&
+	mkdir .git/info &&
 	echo "fake-editor.sh" >.git/info/exclude &&
 	may_only_be_test_must_fail "$2" &&
 	$2 git rebase -i "$1"
@@ -47,7 +48,8 @@ test_expect_success 'rebase interactive ignores modified submodules' '
 	git init sub &&
 	git -C sub commit --allow-empty -m "Initial commit" &&
 	git init super &&
-	git -C super submodule add ../sub &&
+	git -c protocol.file.allow=always \
+		-C super submodule add ../sub &&
 	git -C super config submodule.sub.ignore dirty &&
 	>super/foo &&
 	git -C super add foo &&
diff --git a/t/t3427-rebase-subtree.sh b/t/t3427-rebase-subtree.sh
index 79e43a3..1b3e97c 100755
--- a/t/t3427-rebase-subtree.sh
+++ b/t/t3427-rebase-subtree.sh
@@ -4,6 +4,9 @@ test_description='git rebase tests for -Xsubtree
 
 This test runs git rebase and tests the subtree strategy.
 '
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-rebase.sh
 
@@ -15,12 +18,12 @@ commit_message() {
 # this test script tries to document them.  First, the following commit history
 # is generated (the onelines are shown, time flows from left to right):
 #
-# master1 - master2 - master3
+# topic_1 - topic_2 - topic_3
 #                             \
-# README ---------------------- Add subproject master - master4 - files_subtree/master5
+# README ---------------------- Add subproject main - topic_4 - files_subtree/topic_5
 #
-# Where the merge moves the files master[123].t into the subdirectory
-# files_subtree/ and master4 as well as files_subtree/master5 add files to that
+# Where the merge moves the files topic_[123].t into the subdirectory
+# files_subtree/ and topic_4 as well as files_subtree/topic_5 add files to that
 # directory directly.
 #
 # Then, in subsequent test cases, `git filter-branch` is used to distill just
@@ -28,35 +31,34 @@ commit_message() {
 # an empty commit is added on top. The pre-rebase commit history looks like
 # this:
 #
-# Add subproject master - master4 - files_subtree/master5 - Empty commit
+# Add subproject main - topic_4 - files_subtree/topic_5 - Empty commit
 #
-# where the root commit adds three files: master1.t, master2.t and master3.t.
+# where the root commit adds three files: topic_1.t, topic_2.t and topic_3.t.
 #
-# This commit history is then rebased onto `master3` with the
-# `-Xsubtree=files_subtree` option in three different ways:
+# This commit history is then rebased onto `topic_3` with the
+# `-Xsubtree=files_subtree` option in two different ways:
 #
-# 1. using `--preserve-merges`
-# 2. using `--preserve-merges` and --keep-empty
-# 3. without specifying a rebase backend
+# 1. without specifying a rebase backend
+# 2. using the `--rebase-merges` backend
 
 test_expect_success 'setup' '
 	test_commit README &&
 
 	git init files &&
-	test_commit -C files master1 &&
-	test_commit -C files master2 &&
-	test_commit -C files master3 &&
+	test_commit -C files topic_1 &&
+	test_commit -C files topic_2 &&
+	test_commit -C files topic_3 &&
 
 	: perform subtree merge into files_subtree/ &&
-	git fetch files refs/heads/master:refs/heads/files-master &&
+	git fetch files refs/heads/main:refs/heads/files-main &&
 	git merge -s ours --no-commit --allow-unrelated-histories \
-		files-master &&
-	git read-tree --prefix=files_subtree -u files-master &&
-	git commit -m "Add subproject master" &&
+		files-main &&
+	git read-tree --prefix=files_subtree -u files-main &&
+	git commit -m "Add subproject main" &&
 
 	: add two extra commits to rebase &&
-	test_commit -C files_subtree master4 &&
-	test_commit files_subtree/master5 &&
+	test_commit -C files_subtree topic_4 &&
+	test_commit files_subtree/topic_5 &&
 
 	git checkout -b to-rebase &&
 	git fast-export --no-data HEAD -- files_subtree/ |
@@ -66,45 +68,26 @@ test_expect_success 'setup' '
 	git commit -m "Empty commit" --allow-empty
 '
 
-# FAILURE: Does not preserve master4.
-test_expect_failure REBASE_P 'Rebase -Xsubtree --preserve-merges --onto commit' '
-	reset_rebase &&
-	git checkout -b rebase-preserve-merges to-rebase &&
-	git rebase -Xsubtree=files_subtree --preserve-merges --onto files-master master &&
-	verbose test "$(commit_message HEAD~)" = "master4" &&
-	verbose test "$(commit_message HEAD)" = "files_subtree/master5"
-'
-
-# FAILURE: Does not preserve master4.
-test_expect_failure REBASE_P 'Rebase -Xsubtree --keep-empty --preserve-merges --onto commit' '
-	reset_rebase &&
-	git checkout -b rebase-keep-empty to-rebase &&
-	git rebase -Xsubtree=files_subtree --keep-empty --preserve-merges --onto files-master master &&
-	verbose test "$(commit_message HEAD~2)" = "master4" &&
-	verbose test "$(commit_message HEAD~)" = "files_subtree/master5" &&
-	verbose test "$(commit_message HEAD)" = "Empty commit"
-'
-
 test_expect_success 'Rebase -Xsubtree --empty=ask --onto commit' '
 	reset_rebase &&
 	git checkout -b rebase-onto to-rebase &&
-	test_must_fail git rebase -Xsubtree=files_subtree --empty=ask --onto files-master master &&
+	test_must_fail git rebase -Xsubtree=files_subtree --empty=ask --onto files-main main &&
 	: first pick results in no changes &&
 	git rebase --skip &&
-	verbose test "$(commit_message HEAD~2)" = "master4" &&
-	verbose test "$(commit_message HEAD~)" = "files_subtree/master5" &&
-	verbose test "$(commit_message HEAD)" = "Empty commit"
+	test "$(commit_message HEAD~2)" = "topic_4" &&
+	test "$(commit_message HEAD~)" = "files_subtree/topic_5" &&
+	test "$(commit_message HEAD)" = "Empty commit"
 '
 
 test_expect_success 'Rebase -Xsubtree --empty=ask --rebase-merges --onto commit' '
 	reset_rebase &&
 	git checkout -b rebase-merges-onto to-rebase &&
-	test_must_fail git rebase -Xsubtree=files_subtree --empty=ask --rebase-merges --onto files-master --root &&
+	test_must_fail git rebase -Xsubtree=files_subtree --empty=ask --rebase-merges --onto files-main --root &&
 	: first pick results in no changes &&
 	git rebase --skip &&
-	verbose test "$(commit_message HEAD~2)" = "master4" &&
-	verbose test "$(commit_message HEAD~)" = "files_subtree/master5" &&
-	verbose test "$(commit_message HEAD)" = "Empty commit"
+	test "$(commit_message HEAD~2)" = "topic_4" &&
+	test "$(commit_message HEAD~)" = "files_subtree/topic_5" &&
+	test "$(commit_message HEAD)" = "Empty commit"
 '
 
 test_done
diff --git a/t/t3428-rebase-signoff.sh b/t/t3428-rebase-signoff.sh
index f6993b7..1bebd1c 100755
--- a/t/t3428-rebase-signoff.sh
+++ b/t/t3428-rebase-signoff.sh
@@ -5,49 +5,48 @@ test_description='git rebase --signoff
 This test runs git rebase --signoff and make sure that it works.
 '
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
-# A simple file to commit
-cat >file <<EOF
-a
-EOF
+test_expect_success 'setup' '
+	git commit --allow-empty -m "Initial empty commit" &&
+	test_commit first file a &&
+
+	ident="$GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL>" &&
 
-# Expected commit message for initial commit after rebase --signoff
-cat >expected-initial-signed <<EOF
-Initial empty commit
+	# Expected commit message for initial commit after rebase --signoff
+	cat >expected-initial-signed <<-EOF &&
+	Initial empty commit
 
-Signed-off-by: $(git var GIT_COMMITTER_IDENT | sed -e "s/>.*/>/")
-EOF
+	Signed-off-by: $ident
+	EOF
 
-# Expected commit message after rebase --signoff
-cat >expected-signed <<EOF
-first
+	# Expected commit message after rebase --signoff
+	cat >expected-signed <<-EOF &&
+	first
 
-Signed-off-by: $(git var GIT_COMMITTER_IDENT | sed -e "s/>.*/>/")
-EOF
+	Signed-off-by: $ident
+	EOF
 
-# Expected commit message after rebase without --signoff (or with --no-signoff)
-cat >expected-unsigned <<EOF
-first
-EOF
+	# Expected commit message after rebase without --signoff (or with --no-signoff)
+	cat >expected-unsigned <<-EOF &&
+	first
+	EOF
 
+	git config alias.rbs "rebase --signoff"
+'
 
 # We configure an alias to do the rebase --signoff so that
 # on the next subtest we can show that --no-signoff overrides the alias
-test_expect_success 'rebase --signoff adds a sign-off line' '
-	git commit --allow-empty -m "Initial empty commit" &&
-	git add file && git commit -m first &&
-	git config alias.rbs "rebase --signoff" &&
-	git rbs HEAD^ &&
-	git cat-file commit HEAD | sed -e "1,/^\$/d" > actual &&
-	test_cmp expected-signed actual
+test_expect_success 'rebase --apply --signoff adds a sign-off line' '
+	git rbs --apply HEAD^ &&
+	test_commit_message HEAD expected-signed
 '
 
 test_expect_success 'rebase --no-signoff does not add a sign-off line' '
 	git commit --amend -m "first" &&
 	git rbs --no-signoff HEAD^ &&
-	git cat-file commit HEAD | sed -e "1,/^\$/d" > actual &&
-	test_cmp expected-unsigned actual
+	test_commit_message HEAD expected-unsigned
 '
 
 test_expect_success 'rebase --exec --signoff adds a sign-off line' '
@@ -55,30 +54,25 @@ test_expect_success 'rebase --exec --signoff adds a sign-off line' '
 	git commit --amend -m "first" &&
 	git rebase --exec "touch exec" --signoff HEAD^ &&
 	test_path_is_file exec &&
-	git cat-file commit HEAD | sed -e "1,/^\$/d" >actual &&
-	test_cmp expected-signed actual
+	test_commit_message HEAD expected-signed
 '
 
 test_expect_success 'rebase --root --signoff adds a sign-off line' '
 	git commit --amend -m "first" &&
 	git rebase --root --keep-empty --signoff &&
-	git cat-file commit HEAD^ | sed -e "1,/^\$/d" >actual &&
-	test_cmp expected-initial-signed actual &&
-	git cat-file commit HEAD | sed -e "1,/^\$/d" >actual &&
-	test_cmp expected-signed actual
+	test_commit_message HEAD^ expected-initial-signed &&
+	test_commit_message HEAD expected-signed
 '
 
 test_expect_success 'rebase -i --signoff fails' '
 	git commit --amend -m "first" &&
 	git rebase -i --signoff HEAD^ &&
-	git cat-file commit HEAD | sed -e "1,/^\$/d" >actual &&
-	test_cmp expected-signed actual
+	test_commit_message HEAD expected-signed
 '
 
 test_expect_success 'rebase -m --signoff fails' '
 	git commit --amend -m "first" &&
 	git rebase -m --signoff HEAD^ &&
-	git cat-file commit HEAD | sed -e "1,/^\$/d" >actual &&
-	test_cmp expected-signed actual
+	test_commit_message HEAD expected-signed
 '
 test_done
diff --git a/t/t3429-rebase-edit-todo.sh b/t/t3429-rebase-edit-todo.sh
index 7024d49..8e0d039 100755
--- a/t/t3429-rebase-edit-todo.sh
+++ b/t/t3429-rebase-edit-todo.sh
@@ -2,6 +2,7 @@
 
 test_description='rebase should reread the todo file if an exec modifies it'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-rebase.sh
 
@@ -13,10 +14,15 @@ test_expect_success 'setup' '
 
 test_expect_success 'rebase exec modifies rebase-todo' '
 	todo=.git/rebase-merge/git-rebase-todo &&
-	git rebase HEAD -x "echo exec touch F >>$todo" &&
+	git rebase HEAD~1 -x "echo exec touch F >>$todo" &&
 	test -e F
 '
 
+test_expect_success 'rebase exec with an empty list does not exec anything' '
+	git rebase HEAD -x "true" 2>output &&
+	! grep "Executing: true" output
+'
+
 test_expect_success 'loose object cache vs re-reading todo list' '
 	GIT_REBASE_TODO=.git/rebase-merge/git-rebase-todo &&
 	export GIT_REBASE_TODO &&
diff --git a/t/t3430-rebase-merges.sh b/t/t3430-rebase-merges.sh
index b454f40..59b5d6b 100755
--- a/t/t3430-rebase-merges.sh
+++ b/t/t3430-rebase-merges.sh
@@ -12,12 +12,15 @@ Initial setup:
 
     -- B --                   (first)
    /       \
- A - C - D - E - H            (master)
+ A - C - D - E - H            (main)
    \    \       /
     \    F - G                (second)
      \
       Conflicting-G
 '
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-rebase.sh
 . "$TEST_DIRECTORY"/lib-log-graph.sh
@@ -37,7 +40,7 @@ test_expect_success 'setup' '
 	git checkout -b first &&
 	test_commit B &&
 	b=$(git rev-parse --short HEAD) &&
-	git checkout master &&
+	git checkout main &&
 	test_commit C &&
 	c=$(git rev-parse --short HEAD) &&
 	test_commit D &&
@@ -52,7 +55,7 @@ test_expect_success 'setup' '
 	f=$(git rev-parse --short HEAD) &&
 	test_commit G &&
 	g=$(git rev-parse --short HEAD) &&
-	git checkout master &&
+	git checkout main &&
 	git merge --no-commit G &&
 	test_tick &&
 	git commit -m H &&
@@ -82,7 +85,7 @@ test_expect_success 'create completely different structure' '
 	EOF
 	test_config sequence.editor \""$PWD"/replace-editor.sh\" &&
 	test_tick &&
-	git rebase -i -r A master &&
+	git rebase -i -r A main &&
 	test_cmp_graph <<-\EOF
 	*   Merge the topic branch '\''onebranch'\''
 	|\
@@ -125,14 +128,41 @@ test_expect_success 'generate correct todo list' '
 '
 
 test_expect_success '`reset` refuses to overwrite untracked files' '
-	git checkout -b refuse-to-reset &&
+	git checkout B &&
 	test_commit dont-overwrite-untracked &&
-	git checkout @{-1} &&
-	: >dont-overwrite-untracked.t &&
-	echo "reset refs/tags/dont-overwrite-untracked" >script-from-scratch &&
+	cat >script-from-scratch <<-EOF &&
+	exec >dont-overwrite-untracked.t
+	pick $(git rev-parse B) B
+	reset refs/tags/dont-overwrite-untracked
+	pick $(git rev-parse C) C
+	exec cat .git/rebase-merge/done >actual
+	EOF
 	test_config sequence.editor \""$PWD"/replace-editor.sh\" &&
-	test_must_fail git rebase -ir HEAD &&
-	git rebase --abort
+	test_must_fail git rebase -ir A &&
+	test_cmp_rev HEAD B &&
+	head -n3 script-from-scratch >expect &&
+	test_cmp expect .git/rebase-merge/done &&
+	rm dont-overwrite-untracked.t &&
+	git rebase --continue &&
+	tail -n3 script-from-scratch >>expect &&
+	test_cmp expect actual
+'
+
+test_expect_success '`reset` rejects trees' '
+	test_when_finished "test_might_fail git rebase --abort" &&
+	test_must_fail env GIT_SEQUENCE_EDITOR="echo reset A^{tree} >" \
+		git rebase -i B C >out 2>err &&
+	grep "object .* is a tree" err &&
+	test_must_be_empty out
+'
+
+test_expect_success '`reset` only looks for labels under refs/rewritten/' '
+	test_when_finished "test_might_fail git rebase --abort" &&
+	git branch refs/rewritten/my-label A &&
+	test_must_fail env GIT_SEQUENCE_EDITOR="echo reset my-label >" \
+		git rebase -i B C >out 2>err &&
+	grep "could not resolve ${SQ}my-label${SQ}" err &&
+	test_must_be_empty out
 '
 
 test_expect_success 'failed `merge -C` writes patch (may be rescheduled, too)' '
@@ -145,12 +175,16 @@ test_expect_success 'failed `merge -C` writes patch (may be rescheduled, too)' '
 	test_config sequence.editor \""$PWD"/replace-editor.sh\" &&
 	test_tick &&
 	test_must_fail git rebase -ir HEAD &&
+	test_cmp_rev REBASE_HEAD H^0 &&
 	grep "^merge -C .* G$" .git/rebase-merge/done &&
 	grep "^merge -C .* G$" .git/rebase-merge/git-rebase-todo &&
-	test_path_is_file .git/rebase-merge/patch &&
+	test_path_is_missing .git/rebase-merge/patch &&
+	echo changed >file1 &&
+	git add file1 &&
+	test_must_fail git rebase --continue 2>err &&
+	grep "error: you have staged changes in your working tree" err &&
 
 	: fail because of merge conflict &&
-	rm G.t .git/rebase-merge/patch &&
 	git reset --hard conflicting-G &&
 	test_must_fail git rebase --continue &&
 	! grep "^merge -C .* G$" .git/rebase-merge/git-rebase-todo &&
@@ -169,21 +203,41 @@ test_expect_success 'failed `merge <branch>` does not crash' '
 	grep "^Merge branch ${SQ}G${SQ}$" .git/rebase-merge/message
 '
 
-test_expect_success 'fast-forward merge -c still rewords' '
-	git checkout -b fast-forward-merge-c H &&
+test_expect_success 'merge -c commits before rewording and reloads todo-list' '
+	cat >script-from-scratch <<-\EOF &&
+	merge -c E B
+	merge -c H G
+	EOF
+
+	git checkout -b merge-c H &&
 	(
-		set_fake_editor &&
-		FAKE_COMMIT_MESSAGE=edited \
-			GIT_SEQUENCE_EDITOR="echo merge -c H G >" \
-			git rebase -ir @^
+		set_reword_editor &&
+		GIT_SEQUENCE_EDITOR="\"$PWD/replace-editor.sh\"" \
+			git rebase -i -r D
 	) &&
-	echo edited >expected &&
-	git log --pretty=format:%B -1 >actual &&
-	test_cmp expected actual
+	check_reworded_commits E H
 '
 
+test_expect_success 'merge -c rewords when a strategy is given' '
+	git checkout -b merge-c-with-strategy H &&
+	write_script git-merge-override <<-\EOF &&
+	echo overridden$1 >G.t
+	git add G.t
+	EOF
+
+	PATH="$PWD:$PATH" \
+	GIT_SEQUENCE_EDITOR="echo merge -c H G >" \
+	GIT_EDITOR="echo edited >>" \
+		git rebase --no-ff -ir -s override -Xxopt E &&
+	test_write_lines overridden--xopt >expect &&
+	test_cmp expect G.t &&
+	test_write_lines H "" edited "" >expect &&
+	git log --format=%B -1 >actual &&
+	test_cmp expect actual
+
+'
 test_expect_success 'with a branch tip that was cherry-picked already' '
-	git checkout -b already-upstream master &&
+	git checkout -b already-upstream main &&
 	base="$(git rev-parse --verify HEAD)" &&
 
 	test_commit A1 &&
@@ -210,8 +264,18 @@ test_expect_success 'with a branch tip that was cherry-picked already' '
 	EOF
 '
 
+test_expect_success '--no-rebase-merges countermands --rebase-merges' '
+	git checkout -b no-rebase-merges E &&
+	git rebase --rebase-merges --no-rebase-merges C &&
+	test_cmp_graph C.. <<-\EOF
+	* B
+	* D
+	o C
+	EOF
+'
+
 test_expect_success 'do not rebase cousins unless asked for' '
-	git checkout -b cousins master &&
+	git checkout -b cousins main &&
 	before="$(git rev-parse --verify HEAD)" &&
 	test_tick &&
 	git rebase -r HEAD^ &&
@@ -228,6 +292,40 @@ test_expect_success 'do not rebase cousins unless asked for' '
 	EOF
 '
 
+test_expect_success 'rebase.rebaseMerges=rebase-cousins is equivalent to --rebase-merges=rebase-cousins' '
+	test_config rebase.rebaseMerges rebase-cousins &&
+	git checkout -b config-rebase-cousins main &&
+	git rebase HEAD^ &&
+	test_cmp_graph HEAD^.. <<-\EOF
+	*   Merge the topic branch '\''onebranch'\''
+	|\
+	| * D
+	| * G
+	|/
+	o H
+	EOF
+'
+
+test_expect_success '--no-rebase-merges overrides rebase.rebaseMerges=no-rebase-cousins' '
+	test_config rebase.rebaseMerges no-rebase-cousins &&
+	git checkout -b override-config-no-rebase-cousins E &&
+	git rebase --no-rebase-merges C &&
+	test_cmp_graph C.. <<-\EOF
+	* B
+	* D
+	o C
+	EOF
+'
+
+test_expect_success '--rebase-merges overrides rebase.rebaseMerges=rebase-cousins' '
+	test_config rebase.rebaseMerges rebase-cousins &&
+	git checkout -b override-config-rebase-cousins E &&
+	before="$(git rev-parse --verify HEAD)" &&
+	test_tick &&
+	git rebase --rebase-merges C &&
+	test_cmp_rev HEAD $before
+'
+
 test_expect_success 'refs/rewritten/* is worktree-local' '
 	git worktree add wt &&
 	cat >wt/script-from-scratch <<-\EOF &&
@@ -269,9 +367,9 @@ test_expect_success 'post-rewrite hook and fixups work for merges' '
 	git commit --fixup HEAD same2.t &&
 	fixup="$(git rev-parse HEAD)" &&
 
-	mkdir -p .git/hooks &&
-	test_when_finished "rm .git/hooks/post-rewrite" &&
-	echo "cat >actual" | write_script .git/hooks/post-rewrite &&
+	test_hook post-rewrite <<-\EOF &&
+	cat >actual
+	EOF
 
 	test_tick &&
 	git rebase -i --autosquash -r HEAD^^^ &&
@@ -340,7 +438,7 @@ test_expect_success 'a "merge" into a root commit is a fast-forward' '
 test_expect_success 'A root commit can be a cousin, treat it that way' '
 	git checkout --orphan khnum &&
 	test_commit yama &&
-	git checkout -b asherah master &&
+	git checkout -b asherah main &&
 	test_commit shamkat &&
 	git merge --allow-unrelated-histories khnum &&
 	test_tick &&
@@ -367,7 +465,7 @@ test_expect_success 'labels that are object IDs are rewritten' '
 	git checkout -b third B &&
 	test_commit I &&
 	third=$(git rev-parse HEAD) &&
-	git checkout -b labels master &&
+	git checkout -b labels main &&
 	git merge --no-commit third &&
 	test_tick &&
 	git commit -m "Merge commit '\''$third'\'' into labels" &&
@@ -494,4 +592,23 @@ test_expect_success '--rebase-merges with message matched with onto label' '
 	EOF
 '
 
+test_expect_success 'progress shows the correct total' '
+	git checkout -b progress H &&
+	git rebase --rebase-merges --force-rebase --verbose A 2> err &&
+	# Expecting "Rebasing (N/14)" here, no bogus total number
+	grep "^Rebasing.*/14.$" err >progress &&
+	test_line_count = 14 progress
+'
+
+test_expect_success 'truncate label names' '
+	commit=$(git commit-tree -p HEAD^ -p HEAD -m "0123456789 我 123" HEAD^{tree}) &&
+	git merge --ff-only $commit &&
+
+	done="$(git rev-parse --git-path rebase-merge/done)" &&
+	git -c rebase.maxLabelLength=14 rebase --rebase-merges -x "cp \"$done\" out" --root &&
+	grep "label 0123456789-我$" out &&
+	git -c rebase.maxLabelLength=13 rebase --rebase-merges -x "cp \"$done\" out" --root &&
+	grep "label 0123456789-$" out
+'
+
 test_done
diff --git a/t/t3431-rebase-fork-point.sh b/t/t3431-rebase-fork-point.sh
index 1725627..0bb284d 100755
--- a/t/t3431-rebase-fork-point.sh
+++ b/t/t3431-rebase-fork-point.sh
@@ -5,13 +5,17 @@
 
 test_description='git rebase --fork-point test'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
-# A---B---D---E    (master)
+# A---B---D---E    (main)
 #      \
 #       C*---F---G (side)
 #
-# C was formerly part of master but master was rewound to remove C
+# C was formerly part of main but main was rewound to remove C
 #
 test_expect_success setup '
 	test_commit A &&
@@ -26,52 +30,87 @@ test_expect_success setup '
 	test_commit G
 '
 
+do_test_rebase () {
+	expected="$1" &&
+	shift &&
+	git checkout main &&
+	git reset --hard E &&
+	git checkout side &&
+	git reset --hard G &&
+	git rebase $* &&
+	test_write_lines $expected >expect &&
+	git log --pretty=%s >actual &&
+	test_cmp expect actual
+}
+
 test_rebase () {
 	expected="$1" &&
 	shift &&
-	test_expect_success "git rebase $*" "
-		git checkout master &&
-		git reset --hard E &&
-		git checkout side &&
-		git reset --hard G &&
-		git rebase $* &&
-		test_write_lines $expected >expect &&
-		git log --pretty=%s >actual &&
-		test_cmp expect actual
-	"
+	test_expect_success "git rebase $*" "do_test_rebase '$expected' $*"
 }
 
 test_rebase 'G F E D B A'
 test_rebase 'G F D B A' --onto D
-test_rebase 'G F B A' --keep-base
+test_rebase 'G F C B A' --keep-base
 test_rebase 'G F C E D B A' --no-fork-point
 test_rebase 'G F C D B A' --no-fork-point --onto D
 test_rebase 'G F C B A' --no-fork-point --keep-base
 
-test_rebase 'G F E D B A' --fork-point refs/heads/master
-test_rebase 'G F E D B A' --fork-point master
+test_rebase 'G F E D B A' --fork-point refs/heads/main
+test_rebase 'G F E D B A' --fork-point main
 
-test_rebase 'G F D B A' --fork-point --onto D refs/heads/master
-test_rebase 'G F D B A' --fork-point --onto D master
+test_rebase 'G F D B A' --fork-point --onto D refs/heads/main
+test_rebase 'G F D B A' --fork-point --onto D main
 
-test_rebase 'G F B A' --fork-point --keep-base refs/heads/master
-test_rebase 'G F B A' --fork-point --keep-base master
+test_rebase 'G F B A' --fork-point --keep-base refs/heads/main
+test_rebase 'G F B A' --fork-point --keep-base main
 
-test_rebase 'G F C E D B A' refs/heads/master
-test_rebase 'G F C E D B A' master
+test_rebase 'G F C E D B A' refs/heads/main
+test_rebase 'G F C E D B A' main
 
-test_rebase 'G F C D B A' --onto D refs/heads/master
-test_rebase 'G F C D B A' --onto D master
+test_rebase 'G F C D B A' --onto D refs/heads/main
+test_rebase 'G F C D B A' --onto D main
 
-test_rebase 'G F C B A' --keep-base refs/heads/master
-test_rebase 'G F C B A' --keep-base master
+test_rebase 'G F C B A' --keep-base refs/heads/main
+test_rebase 'G F C B A' --keep-base main
 
 test_expect_success 'git rebase --fork-point with ambigous refname' '
-	git checkout master &&
+	git checkout main &&
 	git checkout -b one &&
 	git checkout side &&
 	git tag one &&
 	test_must_fail git rebase --fork-point --onto D one
 '
 
+test_expect_success '--fork-point and --root both given' '
+	test_must_fail git rebase --fork-point --root 2>err &&
+	test_grep "cannot be used together" err
+'
+
+test_expect_success 'rebase.forkPoint set to false' '
+	test_config rebase.forkPoint false &&
+	do_test_rebase "G F C E D B A"
+'
+
+test_expect_success 'rebase.forkPoint set to false and then to true' '
+	test_config_global rebase.forkPoint false &&
+	test_config rebase.forkPoint true &&
+	do_test_rebase "G F E D B A"
+'
+
+test_expect_success 'rebase.forkPoint set to false and command line says --fork-point' '
+	test_config rebase.forkPoint false &&
+	do_test_rebase "G F E D B A" --fork-point
+'
+
+test_expect_success 'rebase.forkPoint set to true and command line says --no-fork-point' '
+	test_config rebase.forkPoint true &&
+	do_test_rebase "G F C E D B A" --no-fork-point
+'
+
+test_expect_success 'rebase.forkPoint set to true and --root given' '
+	test_config rebase.forkPoint true &&
+	git rebase --root
+'
+
 test_done
diff --git a/t/t3432-rebase-fast-forward.sh b/t/t3432-rebase-fast-forward.sh
index a29eda8..7f1a5dd 100755
--- a/t/t3432-rebase-fast-forward.sh
+++ b/t/t3432-rebase-fast-forward.sh
@@ -5,6 +5,10 @@
 
 test_description='ensure rebase fast-forwards commits when possible'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -84,19 +88,19 @@ test_rebase_same_head_ () {
 
 changes='no changes'
 test_rebase_same_head success noop same success work same
-test_rebase_same_head success noop same success work same master
+test_rebase_same_head success noop same success work same main
 test_rebase_same_head success noop same success work diff --onto B B
 test_rebase_same_head success noop same success work diff --onto B... B
-test_rebase_same_head success noop same success work same --onto master... master
-test_rebase_same_head success noop same success work same --keep-base master
+test_rebase_same_head success noop same success work same --onto main... main
+test_rebase_same_head success noop same success work same --keep-base main
 test_rebase_same_head success noop same success work same --keep-base
 test_rebase_same_head success noop same success work same --no-fork-point
 test_rebase_same_head success noop same success work same --keep-base --no-fork-point
-test_rebase_same_head success noop same success work same --fork-point master
+test_rebase_same_head success noop same success work same --fork-point main
 test_rebase_same_head success noop same success work diff --fork-point --onto B B
 test_rebase_same_head success noop same success work diff --fork-point --onto B... B
-test_rebase_same_head success noop same success work same --fork-point --onto master... master
-test_rebase_same_head success noop same success work same --keep-base --keep-base master
+test_rebase_same_head success noop same success work same --fork-point --onto main... main
+test_rebase_same_head success noop same success work same --keep-base --keep-base main
 
 test_expect_success 'add work same to side' '
 	test_commit E
@@ -104,22 +108,22 @@ test_expect_success 'add work same to side' '
 
 changes='our changes'
 test_rebase_same_head success noop same success work same
-test_rebase_same_head success noop same success work same master
+test_rebase_same_head success noop same success work same main
 test_rebase_same_head success noop same success work diff --onto B B
 test_rebase_same_head success noop same success work diff --onto B... B
-test_rebase_same_head success noop same success work same --onto master... master
-test_rebase_same_head success noop same success work same --keep-base master
+test_rebase_same_head success noop same success work same --onto main... main
+test_rebase_same_head success noop same success work same --keep-base main
 test_rebase_same_head success noop same success work same --keep-base
 test_rebase_same_head success noop same success work same --no-fork-point
 test_rebase_same_head success noop same success work same --keep-base --no-fork-point
-test_rebase_same_head success noop same success work same --fork-point master
+test_rebase_same_head success noop same success work same --fork-point main
 test_rebase_same_head success noop same success work diff --fork-point --onto B B
 test_rebase_same_head success noop same success work diff --fork-point --onto B... B
-test_rebase_same_head success noop same success work same --fork-point --onto master... master
-test_rebase_same_head success noop same success work same --fork-point --keep-base master
+test_rebase_same_head success noop same success work same --fork-point --onto main... main
+test_rebase_same_head success noop same success work same --fork-point --keep-base main
 
 test_expect_success 'add work same to upstream' '
-	git checkout master &&
+	git checkout main &&
 	test_commit F &&
 	git checkout side
 '
@@ -127,12 +131,12 @@ test_expect_success 'add work same to upstream' '
 changes='our and their changes'
 test_rebase_same_head success noop same success work diff --onto B B
 test_rebase_same_head success noop same success work diff --onto B... B
-test_rebase_same_head success noop same success work diff --onto master... master
-test_rebase_same_head success noop same success work diff --keep-base master
+test_rebase_same_head success noop same success work diff --onto main... main
+test_rebase_same_head success noop same success work diff --keep-base main
 test_rebase_same_head success noop same success work diff --keep-base
 test_rebase_same_head failure work same success work diff --fork-point --onto B B
 test_rebase_same_head failure work same success work diff --fork-point --onto B... B
-test_rebase_same_head success noop same success work diff --fork-point --onto master... master
-test_rebase_same_head success noop same success work diff --fork-point --keep-base master
+test_rebase_same_head success noop same success work diff --fork-point --onto main... main
+test_rebase_same_head success noop same success work diff --fork-point --keep-base main
 
 test_done
diff --git a/t/t3433-rebase-across-mode-change.sh b/t/t3433-rebase-across-mode-change.sh
index 05df964..c8172b0 100755
--- a/t/t3433-rebase-across-mode-change.sh
+++ b/t/t3433-rebase-across-mode-change.sh
@@ -2,6 +2,7 @@
 
 test_description='git rebase across mode change'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
diff --git a/t/t3434-rebase-i18n.sh b/t/t3434-rebase-i18n.sh
index c7c835c..e6fef69 100755
--- a/t/t3434-rebase-i18n.sh
+++ b/t/t3434-rebase-i18n.sh
@@ -7,13 +7,16 @@ test_description='rebase with changing encoding
 
 Initial setup:
 
-1 - 2              master
+1 - 2              main
  \
   3 - 4            first
    \
     5 - 6          second
 '
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 compare_msg () {
@@ -41,7 +44,7 @@ test_expect_success 'rebase --rebase-merges update encoding eucJP to UTF-8' '
 	git config i18n.commitencoding eucJP &&
 	git merge -F "$TEST_DIRECTORY/t3434/eucJP.txt" second &&
 	git config i18n.commitencoding UTF-8 &&
-	git rebase --rebase-merges master &&
+	git rebase --rebase-merges main &&
 	compare_msg eucJP.txt eucJP UTF-8
 '
 
@@ -50,7 +53,7 @@ test_expect_success 'rebase --rebase-merges update encoding eucJP to ISO-2022-JP
 	git config i18n.commitencoding eucJP &&
 	git merge -F "$TEST_DIRECTORY/t3434/eucJP.txt" second &&
 	git config i18n.commitencoding ISO-2022-JP &&
-	git rebase --rebase-merges master &&
+	git rebase --rebase-merges main &&
 	compare_msg eucJP.txt eucJP ISO-2022-JP
 '
 
@@ -66,7 +69,7 @@ test_rebase_continue_update_encode () {
 		git config i18n.commitencoding $old &&
 		git commit -F "$TEST_DIRECTORY/t3434/$msgfile" &&
 		git config i18n.commitencoding $new &&
-		test_must_fail git rebase -m master &&
+		test_must_fail git rebase -m main &&
 		test -f .git/rebase-merge/message &&
 		git stripspace <.git/rebase-merge/message >two.t &&
 		git add two.t &&
diff --git a/t/t3435-rebase-gpg-sign.sh b/t/t3435-rebase-gpg-sign.sh
index b47c59c..6aa2aeb 100755
--- a/t/t3435-rebase-gpg-sign.sh
+++ b/t/t3435-rebase-gpg-sign.sh
@@ -5,6 +5,9 @@
 
 test_description='test rebase --[no-]gpg-sign'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 . "$TEST_DIRECTORY/lib-rebase.sh"
 . "$TEST_DIRECTORY/lib-gpg.sh"
@@ -46,7 +49,7 @@ test_expect_success 'setup: merge commit' '
 	test_commit fork-point &&
 	git switch -c side &&
 	test_commit three &&
-	git switch master &&
+	git switch main &&
 	git merge --no-ff side &&
 	git tag merged
 '
@@ -61,10 +64,59 @@ test_rebase_gpg_sign ! true  -i --no-gpg-sign
 test_rebase_gpg_sign ! true  -i --gpg-sign --no-gpg-sign
 test_rebase_gpg_sign   false -i --no-gpg-sign --gpg-sign
 
-test_expect_failure 'rebase -p --no-gpg-sign override commit.gpgsign' '
+test_expect_success 'rebase -r, merge strategy, --gpg-sign will sign commit' '
+	git reset --hard merged &&
+	test_unconfig commit.gpgsign &&
+	git rebase -fr --gpg-sign -s resolve --root &&
+	git verify-commit HEAD
+'
+
+test_expect_success 'rebase -r, merge strategy, commit.gpgsign=true will sign commit' '
+	git reset --hard merged &&
+	git config commit.gpgsign true &&
+	git rebase -fr -s resolve --root &&
+	git verify-commit HEAD
+'
+
+test_expect_success 'rebase -r, merge strategy, commit.gpgsign=false --gpg-sign will sign commit' '
+	git reset --hard merged &&
+	git config commit.gpgsign false &&
+	git rebase -fr --gpg-sign -s resolve --root &&
+	git verify-commit HEAD
+'
+
+test_expect_success "rebase -r, merge strategy, commit.gpgsign=true --no-gpg-sign won't sign commit" '
+	git reset --hard merged &&
+	git config commit.gpgsign true &&
+	git rebase -fr --no-gpg-sign -s resolve --root &&
+	test_must_fail git verify-commit HEAD
+'
+
+test_expect_success 'rebase -r --gpg-sign will sign commit' '
+	git reset --hard merged &&
+	test_unconfig commit.gpgsign &&
+	git rebase -fr --gpg-sign --root &&
+	git verify-commit HEAD
+'
+
+test_expect_success 'rebase -r with commit.gpgsign=true will sign commit' '
+	git reset --hard merged &&
+	git config commit.gpgsign true &&
+	git rebase -fr --root &&
+	git verify-commit HEAD
+'
+
+test_expect_success 'rebase -r --gpg-sign with commit.gpgsign=false will sign commit' '
+	git reset --hard merged &&
+	git config commit.gpgsign false &&
+	git rebase -fr --gpg-sign --root &&
+	git verify-commit HEAD
+'
+
+test_expect_success "rebase -r --no-gpg-sign with commit.gpgsign=true won't sign commit" '
 	git reset --hard merged &&
 	git config commit.gpgsign true &&
-	git rebase -p --no-gpg-sign --onto=one fork-point master &&
+	git rebase -fr --no-gpg-sign --root &&
 	test_must_fail git verify-commit HEAD
 '
 
diff --git a/t/t3436-rebase-more-options.sh b/t/t3436-rebase-more-options.sh
new file mode 100755
index 0000000..94671d3
--- /dev/null
+++ b/t/t3436-rebase-more-options.sh
@@ -0,0 +1,209 @@
+#!/bin/sh
+#
+# Copyright (c) 2019 Rohit Ashiwal
+#
+
+test_description='tests to ensure compatibility between am and interactive backends'
+
+. ./test-lib.sh
+
+. "$TEST_DIRECTORY"/lib-rebase.sh
+
+GIT_AUTHOR_DATE="1999-04-02T08:03:20+05:30"
+export GIT_AUTHOR_DATE
+
+# This is a special case in which both am and interactive backends
+# provide the same output. It was done intentionally because
+# both the backends fall short of optimal behaviour.
+test_expect_success 'setup' '
+	git checkout -b topic &&
+	test_write_lines "line 1" "	line 2" "line 3" >file &&
+	git add file &&
+	git commit -m "add file" &&
+
+	test_write_lines "line 1" "new line 2" "line 3" >file &&
+	git commit -am "update file" &&
+	git tag side &&
+	test_commit commit1 foo foo1 &&
+	test_commit commit2 foo foo2 &&
+	test_commit commit3 foo foo3 &&
+
+	git checkout --orphan main &&
+	rm foo &&
+	test_write_lines "line 1" "        line 2" "line 3" >file &&
+	git commit -am "add file" &&
+	git tag main &&
+
+	mkdir test-bin &&
+	write_script test-bin/git-merge-test <<-\EOF
+	exec git merge-recursive "$@"
+	EOF
+'
+
+test_expect_success '--ignore-whitespace works with apply backend' '
+	test_must_fail git rebase --apply main side &&
+	git rebase --abort &&
+	git rebase --apply --ignore-whitespace main side &&
+	git diff --exit-code side
+'
+
+test_expect_success '--ignore-whitespace works with merge backend' '
+	test_must_fail git rebase --merge main side &&
+	git rebase --abort &&
+	git rebase --merge --ignore-whitespace main side &&
+	git diff --exit-code side
+'
+
+test_expect_success '--ignore-whitespace is remembered when continuing' '
+	(
+		set_fake_editor &&
+		FAKE_LINES="break 1" git rebase -i --ignore-whitespace \
+			main side &&
+		git rebase --continue
+	) &&
+	git diff --exit-code side
+'
+
+test_ctime_is_atime () {
+	git log $1 --format="$GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> %ai" >authortime &&
+	git log $1 --format="%cn <%ce> %ci" >committertime &&
+	test_cmp authortime committertime
+}
+
+test_expect_success '--committer-date-is-author-date works with apply backend' '
+	GIT_AUTHOR_DATE="@1234 +0300" git commit --amend --reset-author &&
+	git rebase --apply --committer-date-is-author-date HEAD^ &&
+	test_ctime_is_atime -1
+'
+
+test_expect_success '--committer-date-is-author-date works with merge backend' '
+	GIT_AUTHOR_DATE="@1234 +0300" git commit --amend --reset-author &&
+	git rebase -m --committer-date-is-author-date HEAD^ &&
+	test_ctime_is_atime -1
+'
+
+test_expect_success '--committer-date-is-author-date works when rewording' '
+	GIT_AUTHOR_DATE="@1234 +0300" git commit --amend --reset-author &&
+	(
+		set_fake_editor &&
+		FAKE_COMMIT_MESSAGE=edited \
+			FAKE_LINES="reword 1" \
+			git rebase -i --committer-date-is-author-date HEAD^
+	) &&
+	test_write_lines edited "" >expect &&
+	git log --format="%B" -1 >actual &&
+	test_cmp expect actual &&
+	test_ctime_is_atime -1
+'
+
+test_expect_success '--committer-date-is-author-date works with rebase -r' '
+	git checkout side &&
+	GIT_AUTHOR_DATE="@1234 +0300" git merge --no-ff commit3 &&
+	git rebase -r --root --committer-date-is-author-date &&
+	test_ctime_is_atime
+'
+
+test_expect_success '--committer-date-is-author-date works when forking merge' '
+	git checkout side &&
+	GIT_AUTHOR_DATE="@1234 +0300" git merge --no-ff commit3 &&
+	PATH="./test-bin:$PATH" git rebase -r --root --strategy=test \
+					--committer-date-is-author-date &&
+	test_ctime_is_atime
+'
+
+test_expect_success '--committer-date-is-author-date works when committing conflict resolution' '
+	git checkout commit2 &&
+	GIT_AUTHOR_DATE="@1980 +0000" git commit --amend --only --reset-author &&
+	test_must_fail git rebase -m --committer-date-is-author-date \
+		--onto HEAD^^ HEAD^ &&
+	echo resolved > foo &&
+	git add foo &&
+	git rebase --continue &&
+	test_ctime_is_atime -1
+'
+
+# Checking for +0000 in the author date is sufficient since the
+# default timezone is UTC but the timezone used while committing is
+# +0530. The inverted logic in the grep is necessary to check all the
+# author dates in the file.
+test_atime_is_ignored () {
+	git log $1 --format=%ai >authortime &&
+	! grep -v +0000 authortime
+}
+
+test_expect_success '--reset-author-date works with apply backend' '
+	git commit --amend --date="$GIT_AUTHOR_DATE" &&
+	git rebase --apply --reset-author-date HEAD^ &&
+	test_atime_is_ignored -1
+'
+
+test_expect_success '--reset-author-date works with merge backend' '
+	git commit --amend --date="$GIT_AUTHOR_DATE" &&
+	git rebase --reset-author-date -m HEAD^ &&
+	test_atime_is_ignored -1
+'
+
+test_expect_success '--reset-author-date works after conflict resolution' '
+	test_must_fail git rebase --reset-author-date -m \
+		--onto commit2^^ commit2^ commit2 &&
+	echo resolved >foo &&
+	git add foo &&
+	git rebase --continue &&
+	test_atime_is_ignored -1
+'
+
+test_expect_success '--reset-author-date works with rebase -r' '
+	git checkout side &&
+	git merge --no-ff commit3 &&
+	git rebase -r --root --reset-author-date &&
+	test_atime_is_ignored
+'
+
+test_expect_success '--reset-author-date with --committer-date-is-author-date works' '
+	test_must_fail git rebase -m --committer-date-is-author-date \
+		--reset-author-date --onto commit2^^ commit2^ commit3 &&
+	git checkout --theirs foo &&
+	git add foo &&
+	git rebase --continue &&
+	test_ctime_is_atime -2 &&
+	test_atime_is_ignored -2
+'
+
+test_expect_success 'reset-author-date with --committer-date-is-author-date works when rewording' '
+	GIT_AUTHOR_DATE="@1234 +0300" git commit --amend --reset-author &&
+	(
+		set_fake_editor &&
+		FAKE_COMMIT_MESSAGE=edited \
+			FAKE_LINES="reword 1" \
+			git rebase -i --committer-date-is-author-date \
+				--reset-author-date HEAD^
+	) &&
+	test_write_lines edited "" >expect &&
+	git log --format="%B" -1 >actual &&
+	test_cmp expect actual &&
+	test_atime_is_ignored -1
+'
+
+test_expect_success '--reset-author-date --committer-date-is-author-date works when forking merge' '
+	GIT_SEQUENCE_EDITOR="echo \"merge -C $(git rev-parse HEAD) commit3\">" \
+		PATH="./test-bin:$PATH" git rebase -i --strategy=test \
+				--reset-author-date \
+				--committer-date-is-author-date side side &&
+	test_ctime_is_atime -1 &&
+	test_atime_is_ignored -1
+ '
+
+test_expect_success '--ignore-date is an alias for --reset-author-date' '
+	git commit --amend --date="$GIT_AUTHOR_DATE" &&
+	git rebase --apply --ignore-date HEAD^ &&
+	git commit --allow-empty -m empty --date="$GIT_AUTHOR_DATE" &&
+	git rebase -m --ignore-date HEAD^ &&
+	test_atime_is_ignored -2
+'
+
+# This must be the last test in this file
+test_expect_success '$EDITOR and friends are unchanged' '
+	test_editor_unchanged
+'
+
+test_done
diff --git a/t/t3437-rebase-fixup-options.sh b/t/t3437-rebase-fixup-options.sh
new file mode 100755
index 0000000..7929e2e
--- /dev/null
+++ b/t/t3437-rebase-fixup-options.sh
@@ -0,0 +1,223 @@
+#!/bin/sh
+#
+# Copyright (c) 2018 Phillip Wood
+#
+
+test_description='git rebase interactive fixup options
+
+This test checks the "fixup [-C|-c]" command of rebase interactive.
+In addition to amending the contents of the commit, "fixup -C"
+replaces the original commit message with the message of the fixup
+commit. "fixup -c" also replaces the original message, but opens the
+editor to allow the user to edit the message before committing. Similar
+to the "fixup" command that works with "fixup!", "fixup -C" works with
+"amend!" upon --autosquash.
+'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+. "$TEST_DIRECTORY"/lib-rebase.sh
+
+EMPTY=""
+
+get_author () {
+	rev="$1" &&
+	git log -1 --pretty=format:"%an %ae %at" "$rev"
+}
+
+test_expect_success 'setup' '
+	cat >message <<-EOF &&
+	amend! B
+	$EMPTY
+	new subject
+	$EMPTY
+	new
+	body
+	EOF
+
+	test_commit initial &&
+	test_commit A A &&
+	test_commit B B &&
+	get_author HEAD >expected-author &&
+	ORIG_AUTHOR_NAME="$GIT_AUTHOR_NAME" &&
+	ORIG_AUTHOR_EMAIL="$GIT_AUTHOR_EMAIL" &&
+	GIT_AUTHOR_NAME="Amend Author" &&
+	GIT_AUTHOR_EMAIL="amend@example.com" &&
+	test_commit "$(cat message)" A A1 A1 &&
+	test_commit A2 A &&
+	test_commit A3 A &&
+	GIT_AUTHOR_NAME="$ORIG_AUTHOR_NAME" &&
+	GIT_AUTHOR_EMAIL="$ORIG_AUTHOR_EMAIL" &&
+	git checkout -b conflicts-branch A &&
+	test_commit conflicts A &&
+
+	set_fake_editor &&
+	git checkout -b branch B &&
+	echo B1 >B &&
+	test_tick &&
+	git commit --fixup=HEAD -a &&
+	git tag B1 &&
+	test_tick &&
+	FAKE_COMMIT_AMEND="edited 1" git commit --fixup=reword:B &&
+	test_tick &&
+	FAKE_COMMIT_AMEND="edited 2" git commit --fixup=reword:HEAD &&
+	echo B2 >B &&
+	test_tick &&
+	FAKE_COMMIT_AMEND="edited squash" git commit --squash=HEAD -a &&
+	git tag B2 &&
+	echo B3 >B &&
+	test_tick &&
+	FAKE_COMMIT_AMEND="edited 3" git commit -a --fixup=amend:HEAD^ &&
+	git tag B3 &&
+
+	GIT_AUTHOR_NAME="Rebase Author" &&
+	GIT_AUTHOR_EMAIL="rebase.author@example.com" &&
+	GIT_COMMITTER_NAME="Rebase Committer" &&
+	GIT_COMMITTER_EMAIL="rebase.committer@example.com"
+'
+
+test_expect_success 'simple fixup -C works' '
+	test_when_finished "test_might_fail git rebase --abort" &&
+	git checkout --detach A2 &&
+	FAKE_LINES="1 fixup_-C 2" git rebase -i B &&
+	test_cmp_rev HEAD^ B &&
+	test_cmp_rev HEAD^{tree} A2^{tree} &&
+	test_commit_message HEAD -m "A2"
+'
+
+test_expect_success 'simple fixup -c works' '
+	test_when_finished "test_might_fail git rebase --abort" &&
+	git checkout --detach A2 &&
+	git log -1 --pretty=format:%B >expected-fixup-message &&
+	test_write_lines "" "Modified A2" >>expected-fixup-message &&
+	FAKE_LINES="1 fixup_-c 2" \
+		FAKE_COMMIT_AMEND="Modified A2" \
+		git rebase -i B &&
+	test_cmp_rev HEAD^ B &&
+	test_cmp_rev HEAD^{tree} A2^{tree} &&
+	test_commit_message HEAD expected-fixup-message
+'
+
+test_expect_success 'fixup -C removes amend! from message' '
+	test_when_finished "test_might_fail git rebase --abort" &&
+	git checkout --detach A1 &&
+	git log -1 --pretty=format:%b >expected-message &&
+	FAKE_LINES="1 fixup_-C 2" git rebase -i A &&
+	test_cmp_rev HEAD^ A &&
+	test_cmp_rev HEAD^{tree} A1^{tree} &&
+	test_commit_message HEAD expected-message &&
+	get_author HEAD >actual-author &&
+	test_cmp expected-author actual-author
+'
+
+test_expect_success 'fixup -C with conflicts gives correct message' '
+	test_when_finished "test_might_fail git rebase --abort" &&
+	git checkout --detach A1 &&
+	git log -1 --pretty=format:%b >expected-message &&
+	test_write_lines "" "edited" >>expected-message &&
+	test_must_fail env FAKE_LINES="1 fixup_-C 2" git rebase -i conflicts &&
+	git checkout --theirs -- A &&
+	git add A &&
+	FAKE_COMMIT_AMEND=edited git rebase --continue &&
+	test_cmp_rev HEAD^ conflicts &&
+	test_cmp_rev HEAD^{tree} A1^{tree} &&
+	test_commit_message HEAD expected-message &&
+	get_author HEAD >actual-author &&
+	test_cmp expected-author actual-author
+'
+
+test_expect_success 'skipping fixup -C after fixup gives correct message' '
+	test_when_finished "test_might_fail git rebase --abort" &&
+	git checkout --detach A3 &&
+	test_must_fail env FAKE_LINES="1 fixup 2 fixup_-C 4" git rebase -i A &&
+	git reset --hard &&
+	FAKE_COMMIT_AMEND=edited git rebase --continue &&
+	test_commit_message HEAD -m "B"
+'
+
+test_expect_success 'sequence of fixup, fixup -C & squash --signoff works' '
+	git checkout --detach B3 &&
+	FAKE_LINES="1 fixup 2 fixup_-C 3 fixup_-C 4 squash 5 fixup_-C 6" \
+		FAKE_COMMIT_AMEND=squashed \
+		FAKE_MESSAGE_COPY=actual-squash-message \
+		git -c commit.status=false rebase -ik --signoff A &&
+	git diff-tree --exit-code --patch HEAD B3 -- &&
+	test_cmp_rev HEAD^ A &&
+	test_cmp "$TEST_DIRECTORY/t3437/expected-squash-message" \
+		actual-squash-message
+'
+
+test_expect_success 'first fixup -C commented out in sequence fixup fixup -C fixup -C' '
+	test_when_finished "test_might_fail git rebase --abort" &&
+	git checkout --detach B2~ &&
+	git log -1 --pretty=format:%b >expected-message &&
+	FAKE_LINES="1 fixup 2 fixup_-C 3 fixup_-C 4" git rebase -i A &&
+	test_cmp_rev HEAD^ A &&
+	test_commit_message HEAD expected-message
+'
+
+test_expect_success 'multiple fixup -c opens editor once' '
+	test_when_finished "test_might_fail git rebase --abort" &&
+	git checkout --detach A3 &&
+	git log -1 --pretty=format:%B >expected-message &&
+	test_write_lines "" "Modified-A3" >>expected-message &&
+	FAKE_COMMIT_AMEND="Modified-A3" \
+		FAKE_LINES="1 fixup_-C 2 fixup_-c 3 fixup_-c 4" \
+		EXPECT_HEADER_COUNT=4 \
+		git rebase -i A &&
+	test_cmp_rev HEAD^ A &&
+	get_author HEAD >actual-author &&
+	test_cmp expected-author actual-author &&
+	test_commit_message HEAD expected-message
+'
+
+test_expect_success 'sequence squash, fixup & fixup -c gives combined message' '
+	test_when_finished "test_might_fail git rebase --abort" &&
+	git checkout --detach A3 &&
+	FAKE_LINES="1 squash 2 fixup 3 fixup_-c 4" \
+		FAKE_MESSAGE_COPY=actual-combined-message \
+		git -c commit.status=false rebase -i A &&
+	test_cmp "$TEST_DIRECTORY/t3437/expected-combined-message" \
+		actual-combined-message &&
+	test_cmp_rev HEAD^ A
+'
+
+test_expect_success 'fixup -C works upon --autosquash with amend!' '
+	git checkout --detach B3 &&
+	FAKE_COMMIT_AMEND=squashed \
+		FAKE_MESSAGE_COPY=actual-squash-message \
+		git -c commit.status=false rebase -ik --autosquash \
+						--signoff A &&
+	git diff-tree --exit-code --patch HEAD B3 -- &&
+	test_cmp_rev HEAD^ A &&
+	test_cmp "$TEST_DIRECTORY/t3437/expected-squash-message" \
+		actual-squash-message
+'
+
+test_expect_success 'fixup -[Cc]<commit> works' '
+	test_when_finished "test_might_fail git rebase --abort" &&
+	cat >todo <<-\EOF &&
+	pick A
+	fixup -CA1
+	pick B
+	fixup -cA2
+	EOF
+	(
+		set_replace_editor todo &&
+		FAKE_COMMIT_MESSAGE="edited and fixed up" \
+			git rebase -i initial initial
+	) &&
+	git log --pretty=format:%B initial.. >actual &&
+	cat >expect <<-EOF &&
+	edited and fixed up
+	$EMPTY
+	new subject
+	$EMPTY
+	new
+	body
+	EOF
+	test_cmp expect actual
+'
+
+test_done
diff --git a/t/t3437/expected-combined-message b/t/t3437/expected-combined-message
new file mode 100644
index 0000000..a26cfb2
--- /dev/null
+++ b/t/t3437/expected-combined-message
@@ -0,0 +1,21 @@
+# This is a combination of 4 commits.
+# This is the 1st commit message:
+
+B
+
+# This is the commit message #2:
+
+# amend! B
+
+new subject
+
+new
+body
+
+# The commit message #3 will be skipped:
+
+# A2
+
+# This is the commit message #4:
+
+A3
diff --git a/t/t3437/expected-squash-message b/t/t3437/expected-squash-message
new file mode 100644
index 0000000..ab2434f
--- /dev/null
+++ b/t/t3437/expected-squash-message
@@ -0,0 +1,51 @@
+# This is a combination of 6 commits.
+# The 1st commit message will be skipped:
+
+# B
+#
+# Signed-off-by: Rebase Committer <rebase.committer@example.com>
+
+# The commit message #2 will be skipped:
+
+# fixup! B
+
+# The commit message #3 will be skipped:
+
+# amend! B
+#
+# B
+#
+# edited 1
+#
+# Signed-off-by: Rebase Committer <rebase.committer@example.com>
+
+# This is the commit message #4:
+
+# amend! amend! B
+
+B
+
+edited 1
+
+edited 2
+
+Signed-off-by: Rebase Committer <rebase.committer@example.com>
+
+# This is the commit message #5:
+
+# squash! amend! amend! B
+
+edited squash
+
+# This is the commit message #6:
+
+# amend! amend! amend! B
+
+B
+
+edited 1
+
+edited 2
+
+edited 3
+squashed
diff --git a/t/t3438-rebase-broken-files.sh b/t/t3438-rebase-broken-files.sh
new file mode 100755
index 0000000..821f08e
--- /dev/null
+++ b/t/t3438-rebase-broken-files.sh
@@ -0,0 +1,70 @@
+#!/bin/sh
+
+test_description='rebase behavior when on-disk files are broken'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+test_expect_success 'set up conflicting branches' '
+	test_commit base file &&
+	git checkout -b branch1 &&
+	test_commit one file &&
+	git checkout -b branch2 HEAD^ &&
+	test_commit two file
+'
+
+create_conflict () {
+	test_when_finished "git rebase --abort" &&
+	git checkout -B tmp branch2 &&
+	test_must_fail git rebase branch1
+}
+
+check_resolve_fails () {
+	echo resolved >file &&
+	git add file &&
+	test_must_fail git rebase --continue
+}
+
+for item in NAME EMAIL DATE
+do
+	test_expect_success "detect missing GIT_AUTHOR_$item" '
+		create_conflict &&
+
+		grep -v $item .git/rebase-merge/author-script >tmp &&
+		mv tmp .git/rebase-merge/author-script &&
+
+		check_resolve_fails
+	'
+done
+
+for item in NAME EMAIL DATE
+do
+	test_expect_success "detect duplicate GIT_AUTHOR_$item" '
+		create_conflict &&
+
+		grep -i $item .git/rebase-merge/author-script >tmp &&
+		cat tmp >>.git/rebase-merge/author-script &&
+
+		check_resolve_fails
+	'
+done
+
+test_expect_success 'unknown key in author-script' '
+	create_conflict &&
+
+	echo "GIT_AUTHOR_BOGUS=${SQ}whatever${SQ}" \
+		>>.git/rebase-merge/author-script &&
+
+	check_resolve_fails
+'
+
+test_expect_success POSIXPERM,SANITY 'unwritable rebased-patches does not leak' '
+	>.git/rebased-patches &&
+	chmod a-w .git/rebased-patches &&
+
+	git checkout -b side HEAD^ &&
+	test_commit unrelated &&
+	test_must_fail git rebase --apply --onto tmp HEAD^
+'
+
+test_done
diff --git a/t/t3500-cherry.sh b/t/t3500-cherry.sh
index f038f34..78c3eac 100755
--- a/t/t3500-cherry.sh
+++ b/t/t3500-cherry.sh
@@ -5,54 +5,77 @@
 
 test_description='git cherry should detect patches integrated upstream
 
-This test cherry-picks one local change of two into master branch, and
+This test cherry-picks one local change of two into main branch, and
 checks that git cherry only returns the second patch in the local branch
 '
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 GIT_AUTHOR_EMAIL=bogus_email_address
 export GIT_AUTHOR_EMAIL
 
-test_expect_success \
-    'prepare repository with topic branch, and check cherry finds the 2 patches from there' \
-    'echo First > A &&
-     git update-index --add A &&
-     test_tick &&
-     git commit -m "Add A." &&
+test_expect_success 'prepare repository with topic branch, and check cherry finds the 2 patches from there' '
+	echo First > A &&
+	git update-index --add A &&
+	test_tick &&
+	git commit -m "Add A." &&
+
+	git checkout -b my-topic-branch &&
 
-     git checkout -b my-topic-branch &&
+	echo Second > B &&
+	git update-index --add B &&
+	test_tick &&
+	git commit -m "Add B." &&
 
-     echo Second > B &&
-     git update-index --add B &&
-     test_tick &&
-     git commit -m "Add B." &&
+	echo AnotherSecond > C &&
+	git update-index --add C &&
+	test_tick &&
+	git commit -m "Add C." &&
 
-     echo AnotherSecond > C &&
-     git update-index --add C &&
-     test_tick &&
-     git commit -m "Add C." &&
+	git checkout -f main &&
+	rm -f B C &&
 
-     git checkout -f master &&
-     rm -f B C &&
+	echo Third >> A &&
+	git update-index A &&
+	test_tick &&
+	git commit -m "Modify A." &&
 
-     echo Third >> A &&
-     git update-index A &&
-     test_tick &&
-     git commit -m "Modify A." &&
+	expr "$(echo $(git cherry main my-topic-branch) )" : "+ [^ ]* + .*"
+'
 
-     expr "$(echo $(git cherry master my-topic-branch) )" : "+ [^ ]* + .*"
+test_expect_success 'check that cherry with limit returns only the top patch' '
+	expr "$(echo $(git cherry main my-topic-branch my-topic-branch^1) )" : "+ [^ ]*"
 '
 
-test_expect_success \
-    'check that cherry with limit returns only the top patch'\
-    'expr "$(echo $(git cherry master my-topic-branch my-topic-branch^1) )" : "+ [^ ]*"
+test_expect_success 'cherry-pick one of the 2 patches, and check cherry recognized one and only one as new' '
+	git cherry-pick my-topic-branch^0 &&
+	echo $(git cherry main my-topic-branch) &&
+	expr "$(echo $(git cherry main my-topic-branch) )" : "+ [^ ]* - .*"
 '
 
-test_expect_success \
-    'cherry-pick one of the 2 patches, and check cherry recognized one and only one as new' \
-    'git cherry-pick my-topic-branch^0 &&
-     echo $(git cherry master my-topic-branch) &&
-     expr "$(echo $(git cherry master my-topic-branch) )" : "+ [^ ]* - .*"
+test_expect_success 'cherry ignores whitespace' '
+	git switch --orphan=upstream-with-space &&
+	test_commit initial file &&
+	>expect &&
+	git switch --create=feature-without-space &&
+
+	# A spaceless file on the feature branch.  Expect a match upstream.
+	printf space >file &&
+	git add file &&
+	git commit -m"file without space" &&
+	git log --format="- %H" -1 >>expect &&
+
+	# A further change.  Should not match upstream.
+	test_commit change file &&
+	git log --format="+ %H" -1 >>expect &&
+
+	git switch upstream-with-space &&
+	# Same as the spaceless file, just with spaces and on upstream.
+	test_commit "file with space" file "s p a c e" file-with-space &&
+	git cherry upstream-with-space feature-without-space >actual &&
+	test_cmp expect actual
 '
 
 test_done
diff --git a/t/t3501-revert-cherry-pick.sh b/t/t3501-revert-cherry-pick.sh
index 3669dfb..411027f 100755
--- a/t/t3501-revert-cherry-pick.sh
+++ b/t/t3501-revert-cherry-pick.sh
@@ -1,22 +1,18 @@
 #!/bin/sh
 
-test_description='test cherry-pick and revert with renames
+test_description='miscellaneous basic tests for cherry-pick and revert'
 
-  --
-   + rename2: renames oops to opos
-  +  rename1: renames oops to spoo
-  +  added:   adds extra line to oops
-  ++ initial: has lines in oops
-
-'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
 
 	for l in a b c d e f g h i j k l m n o
 	do
-		echo $l$l$l$l$l$l$l$l$l
+		echo $l$l$l$l$l$l$l$l$l || return 1
 	done >oops &&
 
 	test_tick &&
@@ -47,7 +43,7 @@ test_expect_success 'cherry-pick --nonsense' '
 	git diff --exit-code HEAD &&
 	test_must_fail git cherry-pick --nonsense 2>msg &&
 	git diff --exit-code HEAD "$pos" &&
-	test_i18ngrep "[Uu]sage:" msg
+	test_grep "[Uu]sage:" msg
 '
 
 test_expect_success 'revert --nonsense' '
@@ -56,15 +52,22 @@ test_expect_success 'revert --nonsense' '
 	git diff --exit-code HEAD &&
 	test_must_fail git revert --nonsense 2>msg &&
 	git diff --exit-code HEAD "$pos" &&
-	test_i18ngrep "[Uu]sage:" msg
+	test_grep "[Uu]sage:" msg
 '
 
+# the following two test cherry-pick and revert with renames
+#
+# --
+#  + rename2: renames oops to opos
+# +  rename1: renames oops to spoo
+# +  added:   adds extra line to oops
+# ++ initial: has lines in oops
+
 test_expect_success 'cherry-pick after renaming branch' '
 
 	git checkout rename2 &&
 	git cherry-pick added &&
-	test $(git rev-parse HEAD^) = $(git rev-parse rename2) &&
-	test -f opos &&
+	test_cmp_rev rename2 HEAD^ &&
 	grep "Add extra line at the end" opos &&
 	git reflog -1 | grep cherry-pick
 
@@ -74,9 +77,9 @@ test_expect_success 'revert after renaming branch' '
 
 	git checkout rename1 &&
 	git revert added &&
-	test $(git rev-parse HEAD^) = $(git rev-parse rename1) &&
-	test -f spoo &&
-	! grep "Add extra line at the end" spoo &&
+	test_cmp_rev rename1 HEAD^ &&
+	test_path_is_file spoo &&
+	test_cmp_rev initial:oops HEAD:spoo &&
 	git reflog -1 | grep revert
 
 '
@@ -96,23 +99,31 @@ test_expect_success 'revert forbidden on dirty working tree' '
 	echo content >extra_file &&
 	git add extra_file &&
 	test_must_fail git revert HEAD 2>errors &&
-	test_i18ngrep "your local changes would be overwritten by " errors
+	test_grep "your local changes would be overwritten by " errors
 
 '
 
 test_expect_success 'cherry-pick on unborn branch' '
-	git checkout --orphan unborn &&
+	git switch --orphan unborn &&
 	git rm --cached -r . &&
-	rm -rf * &&
 	git cherry-pick initial &&
-	git diff --quiet initial &&
+	git diff --exit-code initial &&
+	test_cmp_rev ! initial HEAD
+'
+
+test_expect_success 'cherry-pick on unborn branch with --allow-empty' '
+	git checkout --detach &&
+	git branch -D unborn &&
+	git switch --orphan unborn &&
+	git cherry-pick initial --allow-empty &&
+	git diff --exit-code initial &&
 	test_cmp_rev ! initial HEAD
 '
 
 test_expect_success 'cherry-pick "-" to pick from previous branch' '
 	git checkout unborn &&
 	test_commit to-pick actual content &&
-	git checkout master &&
+	git checkout main &&
 	git cherry-pick - &&
 	echo content >expect &&
 	test_cmp expect actual
@@ -132,7 +143,7 @@ test_expect_success 'cherry-pick "-" is meaningless without checkout' '
 test_expect_success 'cherry-pick "-" works with arguments' '
 	git checkout -b side-branch &&
 	test_commit change actual change &&
-	git checkout master &&
+	git checkout main &&
 	git cherry-pick -s - &&
 	echo "Signed-off-by: C O Mitter <committer@example.com>" >expect &&
 	git cat-file commit HEAD | grep ^Signed-off-by: >signoff &&
@@ -155,4 +166,81 @@ test_expect_success 'cherry-pick works with dirty renamed file' '
 	grep -q "^modified$" renamed
 '
 
+test_expect_success 'advice from failed revert' '
+	test_when_finished "git reset --hard" &&
+	test_commit --no-tag "add dream" dream dream &&
+	dream_oid=$(git rev-parse --short HEAD) &&
+	cat <<-EOF >expected &&
+	error: could not revert $dream_oid... add dream
+	hint: After resolving the conflicts, mark them with
+	hint: "git add/rm <pathspec>", then run
+	hint: "git revert --continue".
+	hint: You can instead skip this commit with "git revert --skip".
+	hint: To abort and get back to the state before "git revert",
+	hint: run "git revert --abort".
+	hint: Disable this message with "git config advice.mergeConflict false"
+	EOF
+	test_commit --append --no-tag "double-add dream" dream dream &&
+	test_must_fail git revert HEAD^ 2>actual &&
+	test_cmp expected actual
+'
+
+test_expect_subject () {
+	echo "$1" >expect &&
+	git log -1 --pretty=%s >actual &&
+	test_cmp expect actual
+}
+
+test_expect_success 'titles of fresh reverts' '
+	test_commit --no-tag A file1 &&
+	test_commit --no-tag B file1 &&
+	git revert --no-edit HEAD &&
+	test_expect_subject "Revert \"B\"" &&
+	git revert --no-edit HEAD &&
+	test_expect_subject "Reapply \"B\"" &&
+	git revert --no-edit HEAD &&
+	test_expect_subject "Revert \"Reapply \"B\"\""
+'
+
+test_expect_success 'title of legacy double revert' '
+	test_commit --no-tag "Revert \"Revert \"B\"\"" file1 &&
+	git revert --no-edit HEAD &&
+	test_expect_subject "Revert \"Revert \"Revert \"B\"\"\""
+'
+
+test_expect_success 'identification of reverted commit (default)' '
+	test_commit to-ident &&
+	test_when_finished "git reset --hard to-ident" &&
+	git checkout --detach to-ident &&
+	git revert --no-edit HEAD &&
+	git cat-file commit HEAD >actual.raw &&
+	grep "^This reverts " actual.raw >actual &&
+	echo "This reverts commit $(git rev-parse HEAD^)." >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'identification of reverted commit (--reference)' '
+	git checkout --detach to-ident &&
+	git revert --reference --no-edit HEAD &&
+	git cat-file commit HEAD >actual.raw &&
+	grep "^This reverts " actual.raw >actual &&
+	echo "This reverts commit $(git show -s --pretty=reference HEAD^)." >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'identification of reverted commit (revert.reference)' '
+	git checkout --detach to-ident &&
+	git -c revert.reference=true revert --no-edit HEAD &&
+	git cat-file commit HEAD >actual.raw &&
+	grep "^This reverts " actual.raw >actual &&
+	echo "This reverts commit $(git show -s --pretty=reference HEAD^)." >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'cherry-pick is unaware of --reference (for now)' '
+	test_when_finished "git reset --hard" &&
+	test_must_fail git cherry-pick --reference HEAD 2>actual &&
+	grep "^usage: git cherry-pick" actual
+'
+
 test_done
diff --git a/t/t3502-cherry-pick-merge.sh b/t/t3502-cherry-pick-merge.sh
index 8b635a1..1b2c0d6 100755
--- a/t/t3502-cherry-pick-merge.sh
+++ b/t/t3502-cherry-pick-merge.sh
@@ -8,6 +8,10 @@ test_description='cherry picking and reverting a merge
 
 '
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -25,7 +29,7 @@ test_expect_success setup '
 	echo new line >B &&
 	git commit -m "add line to B" B &&
 	git tag b &&
-	git checkout master &&
+	git checkout main &&
 	git merge side &&
 	git tag c
 
diff --git a/t/t3503-cherry-pick-root.sh b/t/t3503-cherry-pick-root.sh
index e27f39d..76d393d 100755
--- a/t/t3503-cherry-pick-root.sh
+++ b/t/t3503-cherry-pick-root.sh
@@ -2,6 +2,10 @@
 
 test_description='test cherry-picking (and reverting) a root commit'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -30,7 +34,7 @@ test_expect_success setup '
 test_expect_success 'cherry-pick a root commit' '
 
 	git checkout second^0 &&
-	git cherry-pick master &&
+	git cherry-pick main &&
 	echo first >expect &&
 	test_cmp expect file1
 
@@ -38,14 +42,14 @@ test_expect_success 'cherry-pick a root commit' '
 
 test_expect_success 'revert a root commit' '
 
-	git revert master &&
+	git revert main &&
 	test_path_is_missing file1
 
 '
 
 test_expect_success 'cherry-pick a root commit with an external strategy' '
 
-	git cherry-pick --strategy=resolve master &&
+	git cherry-pick --strategy=resolve main &&
 	echo first >expect &&
 	test_cmp expect file1
 
@@ -53,7 +57,7 @@ test_expect_success 'cherry-pick a root commit with an external strategy' '
 
 test_expect_success 'revert a root commit with an external strategy' '
 
-	git revert --strategy=resolve master &&
+	git revert --strategy=resolve main &&
 	test_path_is_missing file1
 
 '
@@ -65,7 +69,7 @@ test_expect_success 'cherry-pick two root commits' '
 	echo third >expect.file3 &&
 
 	git checkout second^0 &&
-	git cherry-pick master third &&
+	git cherry-pick main third &&
 
 	test_cmp expect.file1 file1 &&
 	test_cmp expect.file2 file2 &&
diff --git a/t/t3504-cherry-pick-rerere.sh b/t/t3504-cherry-pick-rerere.sh
index 80a0d08..4581ae9 100755
--- a/t/t3504-cherry-pick-rerere.sh
+++ b/t/t3504-cherry-pick-rerere.sh
@@ -2,12 +2,15 @@
 
 test_description='cherry-pick should rerere for conflicts'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 test_expect_success setup '
 	test_commit foo &&
-	test_commit foo-master foo &&
-	test_commit bar-master bar &&
+	test_commit foo-main foo &&
+	test_commit bar-main bar &&
 
 	git checkout -b dev foo &&
 	test_commit foo-dev foo &&
@@ -16,7 +19,7 @@ test_expect_success setup '
 '
 
 test_expect_success 'conflicting merge' '
-	test_must_fail git merge master
+	test_must_fail git merge main
 '
 
 test_expect_success 'fixup' '
@@ -29,7 +32,7 @@ test_expect_success 'fixup' '
 '
 
 test_expect_success 'cherry-pick conflict with --rerere-autoupdate' '
-	test_must_fail git cherry-pick --rerere-autoupdate foo..bar-master &&
+	test_must_fail git cherry-pick --rerere-autoupdate foo..bar-main &&
 	test_cmp foo-expect foo &&
 	git diff-files --quiet &&
 	test_must_fail git cherry-pick --continue &&
@@ -41,7 +44,7 @@ test_expect_success 'cherry-pick conflict with --rerere-autoupdate' '
 
 test_expect_success 'cherry-pick conflict repsects rerere.autoUpdate' '
 	test_config rerere.autoUpdate true &&
-	test_must_fail git cherry-pick foo..bar-master &&
+	test_must_fail git cherry-pick foo..bar-main &&
 	test_cmp foo-expect foo &&
 	git diff-files --quiet &&
 	test_must_fail git cherry-pick --continue &&
@@ -53,7 +56,7 @@ test_expect_success 'cherry-pick conflict repsects rerere.autoUpdate' '
 
 test_expect_success 'cherry-pick conflict with --no-rerere-autoupdate' '
 	test_config rerere.autoUpdate true &&
-	test_must_fail git cherry-pick --no-rerere-autoupdate foo..bar-master &&
+	test_must_fail git cherry-pick --no-rerere-autoupdate foo..bar-main &&
 	test_cmp foo-expect foo &&
 	test_must_fail git diff-files --quiet &&
 	git add foo &&
@@ -66,38 +69,38 @@ test_expect_success 'cherry-pick conflict with --no-rerere-autoupdate' '
 '
 
 test_expect_success 'cherry-pick --continue rejects --rerere-autoupdate' '
-	test_must_fail git cherry-pick --rerere-autoupdate foo..bar-master &&
+	test_must_fail git cherry-pick --rerere-autoupdate foo..bar-main &&
 	test_cmp foo-expect foo &&
 	git diff-files --quiet &&
 	test_must_fail git cherry-pick --continue --rerere-autoupdate >actual 2>&1 &&
 	echo "fatal: cherry-pick: --rerere-autoupdate cannot be used with --continue" >expect &&
-	test_i18ncmp expect actual &&
+	test_cmp expect actual &&
 	test_must_fail git cherry-pick --continue --no-rerere-autoupdate >actual 2>&1 &&
 	echo "fatal: cherry-pick: --no-rerere-autoupdate cannot be used with --continue" >expect &&
-	test_i18ncmp expect actual &&
+	test_cmp expect actual &&
 	git cherry-pick --abort
 '
 
 test_expect_success 'cherry-pick --rerere-autoupdate more than once' '
-	test_must_fail git cherry-pick --rerere-autoupdate --rerere-autoupdate foo..bar-master &&
+	test_must_fail git cherry-pick --rerere-autoupdate --rerere-autoupdate foo..bar-main &&
 	test_cmp foo-expect foo &&
 	git diff-files --quiet &&
 	git cherry-pick --abort &&
-	test_must_fail git cherry-pick --rerere-autoupdate --no-rerere-autoupdate --rerere-autoupdate foo..bar-master &&
+	test_must_fail git cherry-pick --rerere-autoupdate --no-rerere-autoupdate --rerere-autoupdate foo..bar-main &&
 	test_cmp foo-expect foo &&
 	git diff-files --quiet &&
 	git cherry-pick --abort &&
-	test_must_fail git cherry-pick --rerere-autoupdate --no-rerere-autoupdate foo..bar-master &&
+	test_must_fail git cherry-pick --rerere-autoupdate --no-rerere-autoupdate foo..bar-main &&
 	test_must_fail git diff-files --quiet &&
 	git cherry-pick --abort
 '
 
 test_expect_success 'cherry-pick conflict without rerere' '
 	test_config rerere.enabled false &&
-	test_must_fail git cherry-pick foo-master &&
+	test_must_fail git cherry-pick foo-main &&
 	grep ===== foo &&
 	grep foo-dev foo &&
-	grep foo-master foo
+	grep foo-main foo
 '
 
 test_done
diff --git a/t/t3505-cherry-pick-empty.sh b/t/t3505-cherry-pick-empty.sh
index 5f911bb..9748443 100755
--- a/t/t3505-cherry-pick-empty.sh
+++ b/t/t3505-cherry-pick-empty.sh
@@ -2,6 +2,9 @@
 
 test_description='test cherry-picking an empty commit'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -17,7 +20,7 @@ test_expect_success setup '
 	test_tick &&
 	git commit --allow-empty-message -m "" &&
 
-	git checkout master &&
+	git checkout main &&
 	git checkout -b empty-change-branch &&
 	test_tick &&
 	git commit --allow-empty -m "empty"
@@ -25,7 +28,7 @@ test_expect_success setup '
 '
 
 test_expect_success 'cherry-pick an empty commit' '
-	git checkout master &&
+	git checkout main &&
 	test_expect_code 1 git cherry-pick empty-change-branch
 '
 
@@ -35,7 +38,7 @@ test_expect_success 'index lockfile was removed' '
 
 test_expect_success 'cherry-pick a commit with an empty message' '
 	test_when_finished "git reset --hard empty-message-branch~1" &&
-	git checkout master &&
+	git checkout main &&
 	git cherry-pick empty-message-branch
 '
 
@@ -44,12 +47,12 @@ test_expect_success 'index lockfile was removed' '
 '
 
 test_expect_success 'cherry-pick a commit with an empty message with --allow-empty-message' '
-	git checkout -f master &&
+	git checkout -f main &&
 	git cherry-pick --allow-empty-message empty-message-branch
 '
 
 test_expect_success 'cherry pick an empty non-ff commit without --allow-empty' '
-	git checkout master &&
+	git checkout main &&
 	echo fourth >>file2 &&
 	git add file2 &&
 	git commit -m "fourth" &&
@@ -57,22 +60,22 @@ test_expect_success 'cherry pick an empty non-ff commit without --allow-empty' '
 '
 
 test_expect_success 'cherry pick an empty non-ff commit with --allow-empty' '
-	git checkout master &&
+	git checkout main &&
 	git cherry-pick --allow-empty empty-change-branch
 '
 
 test_expect_success 'cherry pick with --keep-redundant-commits' '
-	git checkout master &&
+	git checkout main &&
 	git cherry-pick --keep-redundant-commits HEAD^
 '
 
 test_expect_success 'cherry-pick a commit that becomes no-op (prep)' '
-	git checkout master &&
+	git checkout main &&
 	git branch fork &&
 	echo foo >file2 &&
 	git add file2 &&
 	test_tick &&
-	git commit -m "add file2 on master" &&
+	git commit -m "add file2 on main" &&
 
 	git checkout fork &&
 	echo foo >file2 &&
@@ -81,19 +84,68 @@ test_expect_success 'cherry-pick a commit that becomes no-op (prep)' '
 	git commit -m "add file2 on the side"
 '
 
-test_expect_success 'cherry-pick a no-op without --keep-redundant' '
+test_expect_success 'cherry-pick a no-op with neither --keep-redundant nor --empty' '
 	git reset --hard &&
 	git checkout fork^0 &&
-	test_must_fail git cherry-pick master
+	test_must_fail git cherry-pick main
 '
 
 test_expect_success 'cherry-pick a no-op with --keep-redundant' '
 	git reset --hard &&
 	git checkout fork^0 &&
-	git cherry-pick --keep-redundant-commits master &&
+	git cherry-pick --keep-redundant-commits main &&
 	git show -s --format=%s >actual &&
-	echo "add file2 on master" >expect &&
+	echo "add file2 on main" >expect &&
 	test_cmp expect actual
 '
 
+test_expect_success '--keep-redundant-commits is incompatible with operations' '
+	test_must_fail git cherry-pick HEAD 2>output &&
+	test_grep "The previous cherry-pick is now empty" output &&
+	test_must_fail git cherry-pick --keep-redundant-commits --continue 2>output &&
+	test_grep "fatal: cherry-pick: --keep-redundant-commits cannot be used with --continue" output &&
+	test_must_fail git cherry-pick --keep-redundant-commits --skip 2>output &&
+	test_grep "fatal: cherry-pick: --keep-redundant-commits cannot be used with --skip" output &&
+	test_must_fail git cherry-pick --keep-redundant-commits --abort 2>output &&
+	test_grep "fatal: cherry-pick: --keep-redundant-commits cannot be used with --abort" output &&
+	test_must_fail git cherry-pick --keep-redundant-commits --quit 2>output &&
+	test_grep "fatal: cherry-pick: --keep-redundant-commits cannot be used with --quit" output &&
+	git cherry-pick --abort
+'
+
+test_expect_success '--empty is incompatible with operations' '
+	test_must_fail git cherry-pick HEAD 2>output &&
+	test_grep "The previous cherry-pick is now empty" output &&
+	test_must_fail git cherry-pick --empty=stop --continue 2>output &&
+	test_grep "fatal: cherry-pick: --empty cannot be used with --continue" output &&
+	test_must_fail git cherry-pick --empty=stop --skip 2>output &&
+	test_grep "fatal: cherry-pick: --empty cannot be used with --skip" output &&
+	test_must_fail git cherry-pick --empty=stop --abort 2>output &&
+	test_grep "fatal: cherry-pick: --empty cannot be used with --abort" output &&
+	test_must_fail git cherry-pick --empty=stop --quit 2>output &&
+	test_grep "fatal: cherry-pick: --empty cannot be used with --quit" output &&
+	git cherry-pick --abort
+'
+
+test_expect_success 'cherry-pick a no-op with --empty=stop' '
+	git reset --hard &&
+	git checkout fork^0 &&
+	test_must_fail git cherry-pick --empty=stop main 2>output &&
+	test_grep "The previous cherry-pick is now empty" output
+'
+
+test_expect_success 'cherry-pick a no-op with --empty=drop' '
+	git reset --hard &&
+	git checkout fork^0 &&
+	git cherry-pick --empty=drop main &&
+	test_commit_message HEAD -m "add file2 on the side"
+'
+
+test_expect_success 'cherry-pick a no-op with --empty=keep' '
+	git reset --hard &&
+	git checkout fork^0 &&
+	git cherry-pick --empty=keep main &&
+	test_commit_message HEAD -m "add file2 on main"
+'
+
 test_done
diff --git a/t/t3506-cherry-pick-ff.sh b/t/t3506-cherry-pick-ff.sh
index 9d5adbc..b71bad1 100755
--- a/t/t3506-cherry-pick-ff.sh
+++ b/t/t3506-cherry-pick-ff.sh
@@ -2,6 +2,10 @@
 
 test_description='test cherry-picking with --ff option'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -24,7 +28,7 @@ test_expect_success setup '
 '
 
 test_expect_success 'cherry-pick using --ff fast forwards' '
-	git checkout master &&
+	git checkout main &&
 	git reset --hard first &&
 	test_tick &&
 	git cherry-pick --ff second &&
@@ -32,7 +36,7 @@ test_expect_success 'cherry-pick using --ff fast forwards' '
 '
 
 test_expect_success 'cherry-pick not using --ff does not fast forwards' '
-	git checkout master &&
+	git checkout main &&
 	git reset --hard first &&
 	test_tick &&
 	git cherry-pick second &&
@@ -49,7 +53,7 @@ test_expect_success 'cherry-pick not using --ff does not fast forwards' '
 # (This has been taken from t3502-cherry-pick-merge.sh)
 #
 test_expect_success 'merge setup' '
-	git checkout master &&
+	git checkout main &&
 	git reset --hard first &&
 	echo new line >A &&
 	git add A &&
@@ -62,7 +66,7 @@ test_expect_success 'merge setup' '
 	test_tick &&
 	git commit -m "add line to B" B &&
 	git tag B &&
-	git checkout master &&
+	git checkout main &&
 	git merge side &&
 	git tag C &&
 	git checkout -b new A
diff --git a/t/t3507-cherry-pick-conflict.sh b/t/t3507-cherry-pick-conflict.sh
index f107622..f3947b4 100755
--- a/t/t3507-cherry-pick-conflict.sh
+++ b/t/t3507-cherry-pick-conflict.sh
@@ -9,6 +9,10 @@ test_description='test cherry-pick and revert with conflicts
 
 '
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_CREATE_REPO_NO_TEMPLATE=1
 . ./test-lib.sh
 
 pristine_detach () {
@@ -29,7 +33,7 @@ test_expect_success setup '
 	test_commit redundant-pick foo c redundant &&
 	git commit --allow-empty --allow-empty-message &&
 	git tag empty &&
-	git checkout master &&
+	git checkout main &&
 	git config advice.detachedhead false
 
 '
@@ -44,20 +48,24 @@ test_expect_success 'failed cherry-pick does not advance HEAD' '
 	test "$head" = "$newhead"
 '
 
-test_expect_success 'advice from failed cherry-pick' "
+test_expect_success 'advice from failed cherry-pick' '
 	pristine_detach initial &&
 
-	picked=\$(git rev-parse --short picked) &&
+	picked=$(git rev-parse --short picked) &&
 	cat <<-EOF >expected &&
-	error: could not apply \$picked... picked
-	hint: after resolving the conflicts, mark the corrected paths
-	hint: with 'git add <paths>' or 'git rm <paths>'
-	hint: and commit the result with 'git commit'
+	error: could not apply $picked... picked
+	hint: After resolving the conflicts, mark them with
+	hint: "git add/rm <pathspec>", then run
+	hint: "git cherry-pick --continue".
+	hint: You can instead skip this commit with "git cherry-pick --skip".
+	hint: To abort and get back to the state before "git cherry-pick",
+	hint: run "git cherry-pick --abort".
+	hint: Disable this message with "git config advice.mergeConflict false"
 	EOF
 	test_must_fail git cherry-pick picked 2>actual &&
 
-	test_i18ncmp expected actual
-"
+	test_cmp expected actual
+'
 
 test_expect_success 'advice from failed cherry-pick --no-commit' "
 	pristine_detach initial &&
@@ -67,10 +75,11 @@ test_expect_success 'advice from failed cherry-pick --no-commit' "
 	error: could not apply \$picked... picked
 	hint: after resolving the conflicts, mark the corrected paths
 	hint: with 'git add <paths>' or 'git rm <paths>'
+	hint: Disable this message with \"git config advice.mergeConflict false\"
 	EOF
 	test_must_fail git cherry-pick --no-commit picked 2>actual &&
 
-	test_i18ncmp expected actual
+	test_cmp expected actual
 "
 
 test_expect_success 'failed cherry-pick sets CHERRY_PICK_HEAD' '
@@ -170,7 +179,7 @@ test_expect_success 'partial commit of cherry-pick fails' '
 	git add foo &&
 	test_must_fail git commit foo 2>err &&
 
-	test_i18ngrep "cannot do a partial commit during a cherry-pick." err
+	test_grep "cannot do a partial commit during a cherry-pick." err
 '
 
 test_expect_success 'commit --amend of cherry-pick fails' '
@@ -181,7 +190,7 @@ test_expect_success 'commit --amend of cherry-pick fails' '
 	git add foo &&
 	test_must_fail git commit --amend 2>err &&
 
-	test_i18ngrep "in the middle of a cherry-pick -- cannot amend." err
+	test_grep "in the middle of a cherry-pick -- cannot amend." err
 '
 
 test_expect_success 'successful final commit clears cherry-pick state' '
@@ -253,7 +262,7 @@ test_expect_success \
 
 	test_must_fail git cherry-pick picked &&
 
-	test_i18ncmp expected .git/MERGE_MSG
+	test_cmp expected .git/MERGE_MSG
 '
 
 test_expect_success \
@@ -273,7 +282,7 @@ test_expect_success \
 
 	test_must_fail git cherry-pick --cleanup=scissors picked &&
 
-	test_i18ncmp expected .git/MERGE_MSG
+	test_cmp expected .git/MERGE_MSG
 '
 
 test_expect_success 'failed cherry-pick describes conflict in work tree' '
@@ -283,12 +292,12 @@ test_expect_success 'failed cherry-pick describes conflict in work tree' '
 	a
 	=======
 	c
-	>>>>>>> objid picked
+	>>>>>>> objid (picked)
 	EOF
 
 	test_must_fail git cherry-pick picked &&
 
-	sed "s/[a-f0-9]*\.\.\./objid/" foo >actual &&
+	sed "s/[a-f0-9]* (/objid (/" foo >actual &&
 	test_cmp expected actual
 '
 
@@ -298,16 +307,16 @@ test_expect_success 'diff3 -m style' '
 	cat <<-EOF >expected &&
 	<<<<<<< HEAD
 	a
-	||||||| parent of objid picked
+	||||||| parent of objid (picked)
 	b
 	=======
 	c
-	>>>>>>> objid picked
+	>>>>>>> objid (picked)
 	EOF
 
 	test_must_fail git cherry-pick picked &&
 
-	sed "s/[a-f0-9]*\.\.\./objid/" foo >actual &&
+	sed "s/[a-f0-9]* (/objid (/" foo >actual &&
 	test_cmp expected actual
 '
 
@@ -319,7 +328,7 @@ test_expect_success 'revert also handles conflicts sanely' '
 	a
 	=======
 	b
-	>>>>>>> parent of objid picked
+	>>>>>>> parent of objid (picked)
 	EOF
 	{
 		git checkout picked -- foo &&
@@ -345,7 +354,7 @@ test_expect_success 'revert also handles conflicts sanely' '
 	test_must_fail git update-index --refresh -q &&
 	test_must_fail git diff-index --exit-code HEAD &&
 	test_cmp expected-stages actual-stages &&
-	sed "s/[a-f0-9]*\.\.\./objid/" foo >actual &&
+	sed "s/[a-f0-9]* (/objid (/" foo >actual &&
 	test_cmp expected actual
 '
 
@@ -429,16 +438,16 @@ test_expect_success 'revert conflict, diff3 -m style' '
 	cat <<-EOF >expected &&
 	<<<<<<< HEAD
 	a
-	||||||| objid picked
+	||||||| objid (picked)
 	c
 	=======
 	b
-	>>>>>>> parent of objid picked
+	>>>>>>> parent of objid (picked)
 	EOF
 
 	test_must_fail git revert picked &&
 
-	sed "s/[a-f0-9]*\.\.\./objid/" foo >actual &&
+	sed "s/[a-f0-9]* (/objid (/" foo >actual &&
 	test_cmp expected actual
 '
 
@@ -462,7 +471,7 @@ test_expect_success \
 	test_must_fail git revert picked &&
 
 	sed "s/$OID_REGEX/OBJID/" .git/MERGE_MSG >actual &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 test_expect_success \
@@ -485,13 +494,13 @@ test_expect_success \
 	test_must_fail git revert --cleanup=scissors picked &&
 
 	sed "s/$OID_REGEX/OBJID/" .git/MERGE_MSG >actual &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 test_expect_success 'failed cherry-pick does not forget -s' '
 	pristine_detach initial &&
 	test_must_fail git cherry-pick -s picked &&
-	test_i18ngrep -e "Signed-off-by" .git/MERGE_MSG
+	test_grep -e "Signed-off-by" .git/MERGE_MSG
 '
 
 test_expect_success 'commit after failed cherry-pick does not add duplicated -s' '
@@ -552,10 +561,11 @@ test_expect_success 'cherry-pick preserves sparse-checkout' '
 		echo \"/*\" >.git/info/sparse-checkout
 		git read-tree --reset -u HEAD
 		rm .git/info/sparse-checkout" &&
+	mkdir .git/info &&
 	echo /unrelated >.git/info/sparse-checkout &&
 	git read-tree --reset -u HEAD &&
 	test_must_fail git cherry-pick -Xours picked>actual &&
-	test_i18ngrep ! "Changes not staged for commit:" actual
+	test_grep ! "Changes not staged for commit:" actual
 '
 
 test_expect_success 'cherry-pick --continue remembers --keep-redundant-commits' '
diff --git a/t/t3508-cherry-pick-many-commits.sh b/t/t3508-cherry-pick-many-commits.sh
index 23070a7..2d53ce7 100755
--- a/t/t3508-cherry-pick-many-commits.sh
+++ b/t/t3508-cherry-pick-many-commits.sh
@@ -2,6 +2,9 @@
 
 test_description='test cherry-picking many commits'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 check_head_differs_from() {
@@ -26,12 +29,12 @@ test_expect_success setup '
 		git add file1 &&
 		test_tick &&
 		git commit -m "$val" &&
-		git tag $val
+		git tag $val || return 1
 	done
 '
 
 test_expect_success 'cherry-pick first..fourth works' '
-	git checkout -f master &&
+	git checkout -f main &&
 	git reset --hard first &&
 	test_tick &&
 	git cherry-pick first..fourth &&
@@ -45,7 +48,7 @@ test_expect_success 'cherry-pick three one two works' '
 	test_commit one &&
 	test_commit two &&
 	test_commit three &&
-	git checkout -f master &&
+	git checkout -f main &&
 	git reset --hard first &&
 	git cherry-pick three one two &&
 	git diff --quiet three &&
@@ -56,38 +59,38 @@ two"
 '
 
 test_expect_success 'cherry-pick three one two: fails' '
-	git checkout -f master &&
+	git checkout -f main &&
 	git reset --hard first &&
 	test_must_fail git cherry-pick three one two:
 '
 
 test_expect_success 'output to keep user entertained during multi-pick' '
 	cat <<-\EOF >expected &&
-	[master OBJID] second
+	[main OBJID] second
 	 Author: A U Thor <author@example.com>
 	 Date: Thu Apr 7 15:14:13 2005 -0700
 	 1 file changed, 1 insertion(+)
-	[master OBJID] third
+	[main OBJID] third
 	 Author: A U Thor <author@example.com>
 	 Date: Thu Apr 7 15:15:13 2005 -0700
 	 1 file changed, 1 insertion(+)
-	[master OBJID] fourth
+	[main OBJID] fourth
 	 Author: A U Thor <author@example.com>
 	 Date: Thu Apr 7 15:16:13 2005 -0700
 	 1 file changed, 1 insertion(+)
 	EOF
 
-	git checkout -f master &&
+	git checkout -f main &&
 	git reset --hard first &&
 	test_tick &&
 	git cherry-pick first..fourth >actual &&
 	sed -e "s/$_x05[0-9a-f][0-9a-f]/OBJID/" <actual >actual.fuzzy &&
 	test_line_count -ge 3 actual.fuzzy &&
-	test_i18ncmp expected actual.fuzzy
+	test_cmp expected actual.fuzzy
 '
 
 test_expect_success 'cherry-pick --strategy resolve first..fourth works' '
-	git checkout -f master &&
+	git checkout -f main &&
 	git reset --hard first &&
 	test_tick &&
 	git cherry-pick --strategy resolve first..fourth &&
@@ -99,32 +102,32 @@ test_expect_success 'cherry-pick --strategy resolve first..fourth works' '
 test_expect_success 'output during multi-pick indicates merge strategy' '
 	cat <<-\EOF >expected &&
 	Trying simple merge.
-	[master OBJID] second
+	[main OBJID] second
 	 Author: A U Thor <author@example.com>
 	 Date: Thu Apr 7 15:14:13 2005 -0700
 	 1 file changed, 1 insertion(+)
 	Trying simple merge.
-	[master OBJID] third
+	[main OBJID] third
 	 Author: A U Thor <author@example.com>
 	 Date: Thu Apr 7 15:15:13 2005 -0700
 	 1 file changed, 1 insertion(+)
 	Trying simple merge.
-	[master OBJID] fourth
+	[main OBJID] fourth
 	 Author: A U Thor <author@example.com>
 	 Date: Thu Apr 7 15:16:13 2005 -0700
 	 1 file changed, 1 insertion(+)
 	EOF
 
-	git checkout -f master &&
+	git checkout -f main &&
 	git reset --hard first &&
 	test_tick &&
 	git cherry-pick --strategy resolve first..fourth >actual &&
 	sed -e "s/$_x05[0-9a-f][0-9a-f]/OBJID/" <actual >actual.fuzzy &&
-	test_i18ncmp expected actual.fuzzy
+	test_cmp expected actual.fuzzy
 '
 
 test_expect_success 'cherry-pick --ff first..fourth works' '
-	git checkout -f master &&
+	git checkout -f main &&
 	git reset --hard first &&
 	test_tick &&
 	git cherry-pick --ff first..fourth &&
@@ -134,7 +137,7 @@ test_expect_success 'cherry-pick --ff first..fourth works' '
 '
 
 test_expect_success 'cherry-pick -n first..fourth works' '
-	git checkout -f master &&
+	git checkout -f main &&
 	git reset --hard first &&
 	test_tick &&
 	git cherry-pick -n first..fourth &&
@@ -144,7 +147,7 @@ test_expect_success 'cherry-pick -n first..fourth works' '
 '
 
 test_expect_success 'revert first..fourth works' '
-	git checkout -f master &&
+	git checkout -f main &&
 	git reset --hard fourth &&
 	test_tick &&
 	git revert first..fourth &&
@@ -154,7 +157,7 @@ test_expect_success 'revert first..fourth works' '
 '
 
 test_expect_success 'revert ^first fourth works' '
-	git checkout -f master &&
+	git checkout -f main &&
 	git reset --hard fourth &&
 	test_tick &&
 	git revert ^first fourth &&
@@ -164,7 +167,7 @@ test_expect_success 'revert ^first fourth works' '
 '
 
 test_expect_success 'revert fourth fourth~1 fourth~2 works' '
-	git checkout -f master &&
+	git checkout -f main &&
 	git reset --hard fourth &&
 	test_tick &&
 	git revert fourth fourth~1 fourth~2 &&
@@ -174,7 +177,7 @@ test_expect_success 'revert fourth fourth~1 fourth~2 works' '
 '
 
 test_expect_success 'cherry-pick -3 fourth works' '
-	git checkout -f master &&
+	git checkout -f main &&
 	git reset --hard first &&
 	test_tick &&
 	git cherry-pick -3 fourth &&
@@ -184,7 +187,7 @@ test_expect_success 'cherry-pick -3 fourth works' '
 '
 
 test_expect_success 'cherry-pick --stdin works' '
-	git checkout -f master &&
+	git checkout -f main &&
 	git reset --hard first &&
 	test_tick &&
 	git rev-list --reverse first..fourth | git cherry-pick --stdin &&
diff --git a/t/t3509-cherry-pick-merge-df.sh b/t/t3509-cherry-pick-merge-df.sh
index 1e5b394..f415924 100755
--- a/t/t3509-cherry-pick-merge-df.sh
+++ b/t/t3509-cherry-pick-merge-df.sh
@@ -1,6 +1,9 @@
 #!/bin/sh
 
 test_description='Test cherry-pick with directory/file conflicts'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 test_expect_success 'Initialize repository' '
@@ -28,7 +31,7 @@ test_expect_success 'Setup rename across paths each below D/F conflicts' '
 
 test_expect_success 'Cherry-pick succeeds with rename across D/F conflicts' '
 	git reset --hard &&
-	git checkout master^0 &&
+	git checkout main^0 &&
 	git cherry-pick branch
 '
 
diff --git a/t/t3510-cherry-pick-sequence.sh b/t/t3510-cherry-pick-sequence.sh
index 5b94fda..7eb52b1 100755
--- a/t/t3510-cherry-pick-sequence.sh
+++ b/t/t3510-cherry-pick-sequence.sh
@@ -65,7 +65,7 @@ test_expect_success 'cherry-pick persists opts correctly' '
 	# gets interrupted, use a high-enough number that is larger
 	# than the number of parents of any commit we have created
 	mainline=4 &&
-	test_expect_code 128 git cherry-pick -s -m $mainline --strategy=recursive -X patience -X ours initial..anotherpick &&
+	test_expect_code 128 git cherry-pick -s -m $mainline --strategy=recursive -X patience -X ours --edit initial..anotherpick &&
 	test_path_is_dir .git/sequencer &&
 	test_path_is_file .git/sequencer/head &&
 	test_path_is_file .git/sequencer/todo &&
@@ -84,6 +84,68 @@ test_expect_success 'cherry-pick persists opts correctly' '
 	ours
 	EOF
 	git config --file=.git/sequencer/opts --get-all options.strategy-option >actual &&
+	test_cmp expect actual &&
+	echo "true" >expect &&
+	git config --file=.git/sequencer/opts --get-all options.edit >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'cherry-pick persists --empty=stop correctly' '
+	pristine_detach yetanotherpick &&
+	# Picking `anotherpick` forces a conflict so that we stop. That
+	# commit is then skipped, after which we pick `yetanotherpick`
+	# while already on `yetanotherpick` to cause an empty commit
+	test_must_fail git cherry-pick --empty=stop anotherpick yetanotherpick &&
+	test_must_fail git cherry-pick --skip 2>msg &&
+	test_grep "The previous cherry-pick is now empty" msg &&
+	rm msg &&
+	git cherry-pick --abort
+'
+
+test_expect_success 'cherry-pick persists --empty=drop correctly' '
+	pristine_detach yetanotherpick &&
+	# Picking `anotherpick` forces a conflict so that we stop. That
+	# commit is then skipped, after which we pick `yetanotherpick`
+	# while already on `yetanotherpick` to cause an empty commit
+	test_must_fail git cherry-pick --empty=drop anotherpick yetanotherpick &&
+	git cherry-pick --skip &&
+	test_cmp_rev yetanotherpick HEAD
+'
+
+test_expect_success 'cherry-pick persists --empty=keep correctly' '
+	pristine_detach yetanotherpick &&
+	# Picking `anotherpick` forces a conflict so that we stop. That
+	# commit is then skipped, after which we pick `yetanotherpick`
+	# while already on `yetanotherpick` to cause an empty commit
+	test_must_fail git cherry-pick --empty=keep anotherpick yetanotherpick &&
+	git cherry-pick --skip &&
+	test_cmp_rev yetanotherpick HEAD^
+'
+
+test_expect_success 'revert persists opts correctly' '
+	pristine_detach initial &&
+	# to make sure that the session to revert a sequence
+	# gets interrupted, revert commits that are not in the history
+	# of HEAD.
+	test_expect_code 1 git revert -s --strategy=recursive -X patience -X ours --no-edit picked yetanotherpick &&
+	test_path_is_dir .git/sequencer &&
+	test_path_is_file .git/sequencer/head &&
+	test_path_is_file .git/sequencer/todo &&
+	test_path_is_file .git/sequencer/opts &&
+	echo "true" >expect &&
+	git config --file=.git/sequencer/opts --get-all options.signoff >actual &&
+	test_cmp expect actual &&
+	echo "recursive" >expect &&
+	git config --file=.git/sequencer/opts --get-all options.strategy >actual &&
+	test_cmp expect actual &&
+	cat >expect <<-\EOF &&
+	patience
+	ours
+	EOF
+	git config --file=.git/sequencer/opts --get-all options.strategy-option >actual &&
+	test_cmp expect actual &&
+	echo "false" >expect &&
+	git config --file=.git/sequencer/opts --get-all options.edit >actual &&
 	test_cmp expect actual
 '
 
@@ -124,7 +186,7 @@ test_expect_success 'skip "empty" commit' '
 	pristine_detach picked &&
 	test_commit dummy foo d &&
 	test_must_fail git cherry-pick anotherpick 2>err &&
-	test_i18ngrep "git cherry-pick --skip" err &&
+	test_grep "git cherry-pick --skip" err &&
 	git cherry-pick --skip &&
 	test_cmp_rev dummy HEAD
 '
@@ -170,7 +232,7 @@ test_expect_success 'check advice when we move HEAD by committing' '
 	git commit -a &&
 	test_path_is_missing .git/CHERRY_PICK_HEAD &&
 	test_must_fail git cherry-pick --skip 2>advice &&
-	test_i18ncmp expect advice
+	test_cmp expect advice
 '
 
 test_expect_success 'selectively advise --skip while launching another sequence' '
@@ -182,7 +244,7 @@ test_expect_success 'selectively advise --skip while launching another sequence'
 	EOF
 	test_must_fail git cherry-pick picked..yetanotherpick &&
 	test_must_fail git cherry-pick picked..yetanotherpick 2>advice &&
-	test_i18ncmp expect advice &&
+	test_cmp expect advice &&
 	cat >expect <<-EOF &&
 	error: cherry-pick is already in progress
 	hint: try "git cherry-pick (--continue | --abort | --quit)"
@@ -190,7 +252,7 @@ test_expect_success 'selectively advise --skip while launching another sequence'
 	EOF
 	git reset --merge &&
 	test_must_fail git cherry-pick picked..yetanotherpick 2>advice &&
-	test_i18ncmp expect advice
+	test_cmp expect advice
 '
 
 test_expect_success 'allow skipping commit but not abort for a new history' '
@@ -204,10 +266,11 @@ test_expect_success 'allow skipping commit but not abort for a new history' '
 	test_must_fail git cherry-pick anotherpick &&
 	test_must_fail git cherry-pick --abort 2>advice &&
 	git cherry-pick --skip &&
-	test_i18ncmp expect advice
+	test_cmp expect advice
 '
 
 test_expect_success 'allow skipping stopped cherry-pick because of untracked file modifications' '
+	test_when_finished "rm unrelated" &&
 	pristine_detach initial &&
 	git rm --cached unrelated &&
 	git commit -m "untrack unrelated" &&
@@ -283,7 +346,7 @@ test_expect_success '--abort does not unsafely change HEAD' '
 	git reset --hard base &&
 	test_must_fail git cherry-pick picked anotherpick &&
 	git cherry-pick --abort 2>actual &&
-	test_i18ngrep "You seem to have moved HEAD" actual &&
+	test_grep "You seem to have moved HEAD" actual &&
 	test_cmp_rev base HEAD
 '
 
@@ -489,7 +552,7 @@ test_expect_success '--continue asks for help after resolving patch to nil' '
 	test_cmp_rev unrelatedpick CHERRY_PICK_HEAD &&
 	git checkout HEAD -- unrelated &&
 	test_must_fail git cherry-pick --continue 2>msg &&
-	test_i18ngrep "The previous cherry-pick is now empty" msg
+	test_grep "The previous cherry-pick is now empty" msg
 '
 
 test_expect_success 'follow advice and skip nil patch' '
diff --git a/t/t3511-cherry-pick-x.sh b/t/t3511-cherry-pick-x.sh
index 84a587d..dd5d92e 100755
--- a/t/t3511-cherry-pick-x.sh
+++ b/t/t3511-cherry-pick-x.sh
@@ -2,6 +2,7 @@
 
 test_description='Test cherry-pick -x and -s'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 pristine_detach () {
diff --git a/t/t3512-cherry-pick-submodule.sh b/t/t3512-cherry-pick-submodule.sh
index 6ece1d8..f22d1dd 100755
--- a/t/t3512-cherry-pick-submodule.sh
+++ b/t/t3512-cherry-pick-submodule.sh
@@ -2,14 +2,22 @@
 
 test_description='cherry-pick can handle submodules'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-submodule-update.sh
 
-KNOWN_FAILURE_NOFF_MERGE_DOESNT_CREATE_EMPTY_SUBMODULE_DIR=1
-KNOWN_FAILURE_NOFF_MERGE_ATTEMPTS_TO_MERGE_REMOVED_SUBMODULE_FILES=1
+if test "$GIT_TEST_MERGE_ALGORITHM" != ort
+then
+	KNOWN_FAILURE_NOFF_MERGE_DOESNT_CREATE_EMPTY_SUBMODULE_DIR=1
+	KNOWN_FAILURE_NOFF_MERGE_ATTEMPTS_TO_MERGE_REMOVED_SUBMODULE_FILES=1
+fi
 test_submodule_switch "cherry-pick"
 
 test_expect_success 'unrelated submodule/file conflict is ignored' '
+	test_config_global protocol.file.allow always &&
+
 	test_create_repo sub &&
 
 	touch sub/file &&
@@ -35,7 +43,7 @@ test_expect_success 'unrelated submodule/file conflict is ignored' '
 		git add a_file &&
 		git commit -m "modify a file" &&
 
-		git checkout master &&
+		git checkout main &&
 
 		git submodule add ../sub sub &&
 		git submodule update sub &&
diff --git a/t/t3513-revert-submodule.sh b/t/t3513-revert-submodule.sh
index a759f12..8bfe3ed 100755
--- a/t/t3513-revert-submodule.sh
+++ b/t/t3513-revert-submodule.sh
@@ -14,7 +14,7 @@ test_description='revert can handle submodules'
 git_revert () {
 	git status -su >expect &&
 	ls -1pR * >>expect &&
-	tar cf "$TRASH_DIRECTORY/tmp.tar" * &&
+	"$TAR" cf "$TRASH_DIRECTORY/tmp.tar" * &&
 	may_only_be_test_must_fail "$2" &&
 	$2 git checkout "$1" &&
 	if test -n "$2"
@@ -23,14 +23,17 @@ git_revert () {
 	fi &&
 	git revert HEAD &&
 	rm -rf * &&
-	tar xf "$TRASH_DIRECTORY/tmp.tar" &&
+	"$TAR" xf "$TRASH_DIRECTORY/tmp.tar" &&
 	git status -su >actual &&
 	ls -1pR * >>actual &&
 	test_cmp expect actual &&
 	git revert HEAD
 }
 
-KNOWN_FAILURE_NOFF_MERGE_DOESNT_CREATE_EMPTY_SUBMODULE_DIR=1
+if test "$GIT_TEST_MERGE_ALGORITHM" != ort
+then
+	KNOWN_FAILURE_NOFF_MERGE_DOESNT_CREATE_EMPTY_SUBMODULE_DIR=1
+fi
 test_submodule_switch_func "git_revert"
 
 test_done
diff --git a/t/t3600-rm.sh b/t/t3600-rm.sh
index efec8d1..98259e2 100755
--- a/t/t3600-rm.sh
+++ b/t/t3600-rm.sh
@@ -5,6 +5,9 @@
 
 test_description='Test of the various options to git rm.'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 # Setup some files to be removed, some with funny characters
@@ -240,7 +243,7 @@ test_expect_success 'refresh index before checking if it is up-to-date' '
 	test_path_is_missing frotz/nitfol
 '
 
-test_expect_success 'choking "git rm" should not let it die with cruft' '
+choke_git_rm_setup() {
 	git reset -q --hard &&
 	test_when_finished "rm -f .git/index.lock && git reset -q --hard" &&
 	i=0 &&
@@ -249,22 +252,31 @@ test_expect_success 'choking "git rm" should not let it die with cruft' '
 	do
 		echo "100644 $hash 0	some-file-$i"
 		i=$(( $i + 1 ))
-	done | git update-index --index-info &&
+	done | git update-index --index-info
+}
+
+test_expect_success 'choking "git rm" should not let it die with cruft (induce SIGPIPE)' '
+	choke_git_rm_setup &&
 	# git command is intentionally placed upstream of pipe to induce SIGPIPE
 	git rm -n "some-file-*" | : &&
 	test_path_is_missing .git/index.lock
 '
 
+
+test_expect_success !MINGW 'choking "git rm" should not let it die with cruft (induce and check SIGPIPE)' '
+	choke_git_rm_setup &&
+	OUT=$( ((trap "" PIPE && git rm -n "some-file-*"; echo $? 1>&3) | :) 3>&1 ) &&
+	test_match_signal 13 "$OUT" &&
+	test_path_is_missing .git/index.lock
+'
+
 test_expect_success 'Resolving by removal is not a warning-worthy event' '
 	git reset -q --hard &&
 	test_when_finished "rm -f .git/index.lock msg && git reset -q --hard" &&
 	blob=$(echo blob | git hash-object -w --stdin) &&
-	for stage in 1 2 3
-	do
-		echo "100644 $blob $stage	blob"
-	done | git update-index --index-info &&
+	printf "100644 $blob %d\tblob\n" 1 2 3 | git update-index --index-info &&
 	git rm blob >msg 2>&1 &&
-	test_i18ngrep ! "needs merge" msg &&
+	test_grep ! "needs merge" msg &&
 	test_must_fail git ls-files -s --error-unmatch blob
 '
 
@@ -321,7 +333,7 @@ test_expect_success 'rm removes empty submodules from work tree' '
 
 test_expect_success 'rm removes removed submodule from index and .gitmodules' '
 	git reset --hard &&
-	git submodule update &&
+	git -c protocol.file.allow=always submodule update &&
 	rm -rf submod &&
 	git rm submod &&
 	git status -s -uno --ignore-submodules=none >actual &&
@@ -439,7 +451,7 @@ test_expect_success 'rm issues a warning when section is not found in .gitmodule
 	git add .gitmodules &&
 	echo "warning: Could not find section in .gitmodules where path=submod" >expect.err &&
 	git rm submod >actual 2>actual.err &&
-	test_i18ncmp expect.err actual.err &&
+	test_cmp expect.err actual.err &&
 	test_path_is_missing submod &&
 	test_path_is_missing submod/.git &&
 	git status -s -uno >actual &&
@@ -483,16 +495,16 @@ test_expect_success 'setup submodule conflict' '
 	echo 1 >nitfol &&
 	git add nitfol &&
 	git commit -m "added nitfol 1" &&
-	git checkout -b branch2 master &&
+	git checkout -b branch2 main &&
 	echo 2 >nitfol &&
 	git add nitfol &&
 	git commit -m "added nitfol 2" &&
-	git checkout -b conflict1 master &&
+	git checkout -b conflict1 main &&
 	git -C submod fetch &&
 	git -C submod checkout branch1 &&
 	git add submod &&
 	git commit -m "submod 1" &&
-	git checkout -b conflict2 master &&
+	git checkout -b conflict2 main &&
 	git -C submod checkout branch2 &&
 	git add submod &&
 	git commit -m "submod 2"
@@ -604,7 +616,7 @@ test_expect_success 'rm of a conflicted unpopulated submodule succeeds' '
 '
 
 test_expect_success 'rm of a populated submodule with a .git directory migrates git dir' '
-	git checkout -f master &&
+	git checkout -f main &&
 	git reset --hard &&
 	git submodule update &&
 	(
@@ -619,7 +631,7 @@ test_expect_success 'rm of a populated submodule with a .git directory migrates
 	test_path_is_missing submod/.git &&
 	git status -s -uno --ignore-submodules=none >actual &&
 	test_file_not_empty actual &&
-	test_i18ngrep Migrating output.err
+	test_grep Migrating output.err
 '
 
 cat >expect.deepmodified <<EOF
@@ -627,6 +639,7 @@ cat >expect.deepmodified <<EOF
 EOF
 
 test_expect_success 'setup subsubmodule' '
+	test_config_global protocol.file.allow always &&
 	git reset --hard &&
 	git submodule update &&
 	(
@@ -709,7 +722,7 @@ test_expect_success "rm absorbs submodule's nested .git directory" '
 	test_path_is_missing submod/subsubmod/.git &&
 	git status -s -uno --ignore-submodules=none >actual &&
 	test_file_not_empty actual &&
-	test_i18ngrep Migrating output.err
+	test_grep Migrating output.err
 '
 
 test_expect_success 'checking out a commit after submodule removal needs manual updates' '
@@ -717,8 +730,8 @@ test_expect_success 'checking out a commit after submodule removal needs manual
 	git checkout HEAD^ &&
 	git submodule update &&
 	git checkout -q HEAD^ &&
-	git checkout -q master 2>actual &&
-	test_i18ngrep "^warning: unable to rmdir '\''submod'\'':" actual &&
+	git checkout -q main 2>actual &&
+	test_grep "^warning: unable to rmdir '\''submod'\'':" actual &&
 	git status -s submod >actual &&
 	echo "?? submod/" >expected &&
 	test_cmp expected actual &&
@@ -809,7 +822,7 @@ test_expect_success 'rm files with different staged content' '
 	echo content1 >foo.txt &&
 	echo content1 >bar.txt &&
 	test_must_fail git rm foo.txt bar.txt 2>actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 test_expect_success 'rm files with different staged content without hints' '
@@ -822,7 +835,7 @@ test_expect_success 'rm files with different staged content without hints' '
 	echo content2 >foo.txt &&
 	echo content2 >bar.txt &&
 	test_must_fail git -c advice.rmhints=false rm foo.txt bar.txt 2>actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 test_expect_success 'rm file with local modification' '
@@ -834,7 +847,7 @@ test_expect_success 'rm file with local modification' '
 	git commit -m "testing rm 3" &&
 	echo content3 >foo.txt &&
 	test_must_fail git rm foo.txt 2>actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 test_expect_success 'rm file with local modification without hints' '
@@ -844,7 +857,7 @@ test_expect_success 'rm file with local modification without hints' '
 	EOF
 	echo content4 >bar.txt &&
 	test_must_fail git -c advice.rmhints=false rm bar.txt 2>actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 test_expect_success 'rm file with changes in the index' '
@@ -857,7 +870,7 @@ test_expect_success 'rm file with changes in the index' '
 	echo content5 >foo.txt &&
 	git add foo.txt &&
 	test_must_fail git rm foo.txt 2>actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 test_expect_success 'rm file with changes in the index without hints' '
@@ -866,7 +879,7 @@ test_expect_success 'rm file with changes in the index without hints' '
 	    foo.txt
 	EOF
 	test_must_fail git -c advice.rmhints=false rm foo.txt 2>actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 test_expect_success 'rm files with two different errors' '
@@ -885,7 +898,7 @@ test_expect_success 'rm files with two different errors' '
 	echo content6 >bar1.txt &&
 	git add bar1.txt &&
 	test_must_fail git rm bar1.txt foo1.txt 2>actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 test_expect_success 'rm empty string should fail' '
diff --git a/t/t3601-rm-pathspec-file.sh b/t/t3601-rm-pathspec-file.sh
index 7de21f8..7cef129 100755
--- a/t/t3601-rm-pathspec-file.sh
+++ b/t/t3601-rm-pathspec-file.sh
@@ -2,6 +2,7 @@
 
 test_description='rm --pathspec-from-file'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_tick
@@ -66,14 +67,14 @@ test_expect_success 'error conditions' '
 	echo fileA.t >list &&
 
 	test_must_fail git rm --pathspec-from-file=list -- fileA.t 2>err &&
-	test_i18ngrep -e "--pathspec-from-file is incompatible with pathspec arguments" err &&
+	test_grep -e ".--pathspec-from-file. and pathspec arguments cannot be used together" err &&
 
 	test_must_fail git rm --pathspec-file-nul 2>err &&
-	test_i18ngrep -e "--pathspec-file-nul requires --pathspec-from-file" err &&
+	test_grep -e "the option .--pathspec-file-nul. requires .--pathspec-from-file." err &&
 
 	>empty_list &&
 	test_must_fail git rm --pathspec-from-file=empty_list 2>err &&
-	test_i18ngrep -e "No pathspec was given. Which files should I remove?" err
+	test_grep -e "No pathspec was given. Which files should I remove?" err
 '
 
 test_done
diff --git a/t/t3602-rm-sparse-checkout.sh b/t/t3602-rm-sparse-checkout.sh
new file mode 100755
index 0000000..08580fd
--- /dev/null
+++ b/t/t3602-rm-sparse-checkout.sh
@@ -0,0 +1,139 @@
+#!/bin/sh
+
+test_description='git rm in sparse checked out working trees'
+
+. ./test-lib.sh
+
+test_expect_success 'setup' "
+	mkdir -p sub/dir &&
+	touch a b c sub/d sub/dir/e &&
+	git add -A &&
+	git commit -m files &&
+
+	cat >sparse_error_header <<-EOF &&
+	The following paths and/or pathspecs matched paths that exist
+	outside of your sparse-checkout definition, so will not be
+	updated in the index:
+	EOF
+
+	cat >sparse_hint <<-EOF &&
+	hint: If you intend to update such entries, try one of the following:
+	hint: * Use the --sparse option.
+	hint: * Disable or modify the sparsity rules.
+	hint: Disable this message with \"git config advice.updateSparsePath false\"
+	EOF
+
+	echo b | cat sparse_error_header - >sparse_entry_b_error &&
+	cat sparse_entry_b_error sparse_hint >b_error_and_hint
+"
+
+for opt in "" -f --dry-run
+do
+	test_expect_success "rm${opt:+ $opt} does not remove sparse entries" '
+		git sparse-checkout set --no-cone a &&
+		test_must_fail git rm $opt b 2>stderr &&
+		test_cmp b_error_and_hint stderr &&
+		git ls-files --error-unmatch b
+	'
+done
+
+test_expect_success 'recursive rm does not remove sparse entries' '
+	git reset --hard &&
+	git sparse-checkout set sub/dir &&
+	git rm -r sub &&
+	git status --porcelain -uno >actual &&
+	cat >expected <<-\EOF &&
+	D  sub/dir/e
+	EOF
+	test_cmp expected actual &&
+
+	git rm --sparse -r sub &&
+	git status --porcelain -uno >actual2 &&
+	cat >expected2 <<-\EOF &&
+	D  sub/d
+	D  sub/dir/e
+	EOF
+	test_cmp expected2 actual2
+'
+
+test_expect_success 'recursive rm --sparse removes sparse entries' '
+	git reset --hard &&
+	git sparse-checkout set "sub/dir" &&
+	git rm --sparse -r sub &&
+	git status --porcelain -uno >actual &&
+	cat >expected <<-\EOF &&
+	D  sub/d
+	D  sub/dir/e
+	EOF
+	test_cmp expected actual
+'
+
+test_expect_success 'rm obeys advice.updateSparsePath' '
+	git reset --hard &&
+	git sparse-checkout set a &&
+	test_must_fail git -c advice.updateSparsePath=false rm b 2>stderr &&
+	test_cmp sparse_entry_b_error stderr
+'
+
+test_expect_success 'do not advice about sparse entries when they do not match the pathspec' '
+	git reset --hard &&
+	git sparse-checkout set a &&
+	test_must_fail git rm nonexistent 2>stderr &&
+	grep "fatal: pathspec .nonexistent. did not match any files" stderr &&
+	! grep -F -f sparse_error_header stderr
+'
+
+test_expect_success 'do not warn about sparse entries when pathspec matches dense entries' '
+	git reset --hard &&
+	git sparse-checkout set a &&
+	git rm "[ba]" 2>stderr &&
+	test_must_be_empty stderr &&
+	git ls-files --error-unmatch b &&
+	test_must_fail git ls-files --error-unmatch a
+'
+
+test_expect_success 'do not warn about sparse entries with --ignore-unmatch' '
+	git reset --hard &&
+	git sparse-checkout set a &&
+	git rm --ignore-unmatch b 2>stderr &&
+	test_must_be_empty stderr &&
+	git ls-files --error-unmatch b
+'
+
+test_expect_success 'refuse to rm a non-skip-worktree path outside sparse cone' '
+	git reset --hard &&
+	git sparse-checkout set a &&
+	git update-index --no-skip-worktree b &&
+	test_must_fail git rm b 2>stderr &&
+	test_cmp b_error_and_hint stderr &&
+	git rm --sparse b 2>stderr &&
+	test_must_be_empty stderr &&
+	test_path_is_missing b
+'
+
+test_expect_success 'can remove files from non-sparse dir' '
+	git reset --hard &&
+	git sparse-checkout disable &&
+	mkdir -p w x/y &&
+	test_commit w/f &&
+	test_commit x/y/f &&
+
+	git sparse-checkout set --no-cone w !/x y/ &&
+	git rm w/f.t x/y/f.t 2>stderr &&
+	test_must_be_empty stderr
+'
+
+test_expect_success 'refuse to remove non-skip-worktree file from sparse dir' '
+	git reset --hard &&
+	git sparse-checkout disable &&
+	mkdir -p x/y/z &&
+	test_commit x/y/z/f &&
+	git sparse-checkout set --no-cone !/x y/ !x/y/z &&
+
+	git update-index --no-skip-worktree x/y/z/f.t &&
+	test_must_fail git rm x/y/z/f.t 2>stderr &&
+	echo x/y/z/f.t | cat sparse_error_header - sparse_hint >expect &&
+	test_cmp expect stderr
+'
+
+test_done
diff --git a/t/t3650-replay-basics.sh b/t/t3650-replay-basics.sh
new file mode 100755
index 0000000..3896702
--- /dev/null
+++ b/t/t3650-replay-basics.sh
@@ -0,0 +1,198 @@
+#!/bin/sh
+
+test_description='basic git replay tests'
+
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+. ./test-lib.sh
+
+GIT_AUTHOR_NAME=author@name
+GIT_AUTHOR_EMAIL=bogus@email@address
+export GIT_AUTHOR_NAME GIT_AUTHOR_EMAIL
+
+test_expect_success 'setup' '
+	test_commit A &&
+	test_commit B &&
+
+	git switch -c topic1 &&
+	test_commit C &&
+	git switch -c topic2 &&
+	test_commit D &&
+	test_commit E &&
+	git switch topic1 &&
+	test_commit F &&
+	git switch -c topic3 &&
+	test_commit G &&
+	test_commit H &&
+	git switch -c topic4 main &&
+	test_commit I &&
+	test_commit J &&
+
+	git switch -c next main &&
+	test_commit K &&
+	git merge -m "Merge topic1" topic1 &&
+	git merge -m "Merge topic2" topic2 &&
+	git merge -m "Merge topic3" topic3 &&
+	>evil &&
+	git add evil &&
+	git commit --amend &&
+	git merge -m "Merge topic4" topic4 &&
+
+	git switch main &&
+	test_commit L &&
+	test_commit M &&
+
+	git switch -c conflict B &&
+	test_commit C.conflict C.t conflict
+'
+
+test_expect_success 'setup bare' '
+	git clone --bare . bare
+'
+
+test_expect_success 'using replay to rebase two branches, one on top of other' '
+	git replay --onto main topic1..topic2 >result &&
+
+	test_line_count = 1 result &&
+
+	git log --format=%s $(cut -f 3 -d " " result) >actual &&
+	test_write_lines E D M L B A >expect &&
+	test_cmp expect actual &&
+
+	printf "update refs/heads/topic2 " >expect &&
+	printf "%s " $(cut -f 3 -d " " result) >>expect &&
+	git rev-parse topic2 >>expect &&
+
+	test_cmp expect result
+'
+
+test_expect_success 'using replay on bare repo to rebase two branches, one on top of other' '
+	git -C bare replay --onto main topic1..topic2 >result-bare &&
+	test_cmp expect result-bare
+'
+
+test_expect_success 'using replay to rebase with a conflict' '
+	test_expect_code 1 git replay --onto topic1 B..conflict
+'
+
+test_expect_success 'using replay on bare repo to rebase with a conflict' '
+	test_expect_code 1 git -C bare replay --onto topic1 B..conflict
+'
+
+test_expect_success 'using replay to perform basic cherry-pick' '
+	# The differences between this test and previous ones are:
+	#   --advance vs --onto
+	# 2nd field of result is refs/heads/main vs. refs/heads/topic2
+	# 4th field of result is hash for main instead of hash for topic2
+
+	git replay --advance main topic1..topic2 >result &&
+
+	test_line_count = 1 result &&
+
+	git log --format=%s $(cut -f 3 -d " " result) >actual &&
+	test_write_lines E D M L B A >expect &&
+	test_cmp expect actual &&
+
+	printf "update refs/heads/main " >expect &&
+	printf "%s " $(cut -f 3 -d " " result) >>expect &&
+	git rev-parse main >>expect &&
+
+	test_cmp expect result
+'
+
+test_expect_success 'using replay on bare repo to perform basic cherry-pick' '
+	git -C bare replay --advance main topic1..topic2 >result-bare &&
+	test_cmp expect result-bare
+'
+
+test_expect_success 'replay on bare repo fails with both --advance and --onto' '
+	test_must_fail git -C bare replay --advance main --onto main topic1..topic2 >result-bare
+'
+
+test_expect_success 'replay fails when both --advance and --onto are omitted' '
+	test_must_fail git replay topic1..topic2 >result
+'
+
+test_expect_success 'using replay to also rebase a contained branch' '
+	git replay --contained --onto main main..topic3 >result &&
+
+	test_line_count = 2 result &&
+	cut -f 3 -d " " result >new-branch-tips &&
+
+	git log --format=%s $(head -n 1 new-branch-tips) >actual &&
+	test_write_lines F C M L B A >expect &&
+	test_cmp expect actual &&
+
+	git log --format=%s $(tail -n 1 new-branch-tips) >actual &&
+	test_write_lines H G F C M L B A >expect &&
+	test_cmp expect actual &&
+
+	printf "update refs/heads/topic1 " >expect &&
+	printf "%s " $(head -n 1 new-branch-tips) >>expect &&
+	git rev-parse topic1 >>expect &&
+	printf "update refs/heads/topic3 " >>expect &&
+	printf "%s " $(tail -n 1 new-branch-tips) >>expect &&
+	git rev-parse topic3 >>expect &&
+
+	test_cmp expect result
+'
+
+test_expect_success 'using replay on bare repo to also rebase a contained branch' '
+	git -C bare replay --contained --onto main main..topic3 >result-bare &&
+	test_cmp expect result-bare
+'
+
+test_expect_success 'using replay to rebase multiple divergent branches' '
+	git replay --onto main ^topic1 topic2 topic4 >result &&
+
+	test_line_count = 2 result &&
+	cut -f 3 -d " " result >new-branch-tips &&
+
+	git log --format=%s $(head -n 1 new-branch-tips) >actual &&
+	test_write_lines E D M L B A >expect &&
+	test_cmp expect actual &&
+
+	git log --format=%s $(tail -n 1 new-branch-tips) >actual &&
+	test_write_lines J I M L B A >expect &&
+	test_cmp expect actual &&
+
+	printf "update refs/heads/topic2 " >expect &&
+	printf "%s " $(head -n 1 new-branch-tips) >>expect &&
+	git rev-parse topic2 >>expect &&
+	printf "update refs/heads/topic4 " >>expect &&
+	printf "%s " $(tail -n 1 new-branch-tips) >>expect &&
+	git rev-parse topic4 >>expect &&
+
+	test_cmp expect result
+'
+
+test_expect_success 'using replay on bare repo to rebase multiple divergent branches, including contained ones' '
+	git -C bare replay --contained --onto main ^main topic2 topic3 topic4 >result &&
+
+	test_line_count = 4 result &&
+	cut -f 3 -d " " result >new-branch-tips &&
+
+	>expect &&
+	for i in 2 1 3 4
+	do
+		printf "update refs/heads/topic$i " >>expect &&
+		printf "%s " $(grep topic$i result | cut -f 3 -d " ") >>expect &&
+		git -C bare rev-parse topic$i >>expect || return 1
+	done &&
+
+	test_cmp expect result &&
+
+	test_write_lines F C M L B A >expect1 &&
+	test_write_lines E D C M L B A >expect2 &&
+	test_write_lines H G F C M L B A >expect3 &&
+	test_write_lines J I M L B A >expect4 &&
+
+	for i in 1 2 3 4
+	do
+		git -C bare log --format=%s $(grep topic$i result | cut -f 3 -d " ") >actual &&
+		test_cmp expect$i actual || return 1
+	done
+'
+
+test_done
diff --git a/t/t3700-add.sh b/t/t3700-add.sh
index b7d4ba6..839c904 100755
--- a/t/t3700-add.sh
+++ b/t/t3700-add.sh
@@ -5,8 +5,11 @@
 
 test_description='Test of git add, including the -- option.'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
+. "$TEST_DIRECTORY"/lib-unique-files.sh
+
 # Test the file mode "$1" of the file "$2" in the index.
 test_mode_in_index () {
 	case "$(git ls-files -s "$2")" in
@@ -21,17 +24,53 @@ test_mode_in_index () {
 	esac
 }
 
-test_expect_success \
-    'Test of git add' \
-    'touch foo && git add foo'
+test_expect_success 'Test of git add' '
+	touch foo && git add foo
+'
 
-test_expect_success \
-    'Post-check that foo is in the index' \
-    'git ls-files foo | grep foo'
+test_expect_success 'Test with no pathspecs' '
+	cat >expect <<-EOF &&
+	Nothing specified, nothing added.
+	hint: Maybe you wanted to say ${SQ}git add .${SQ}?
+	hint: Disable this message with "git config advice.addEmptyPathspec false"
+	EOF
+	git add 2>actual &&
+	test_cmp expect actual
+'
 
-test_expect_success \
-    'Test that "git add -- -q" works' \
-    'touch -- -q && git add -- -q'
+test_expect_success 'Post-check that foo is in the index' '
+	git ls-files foo | grep foo
+'
+
+test_expect_success 'Test that "git add -- -q" works' '
+	touch -- -q && git add -- -q
+'
+
+BATCH_CONFIGURATION='-c core.fsync=loose-object -c core.fsyncmethod=batch'
+
+test_expect_success 'git add: core.fsyncmethod=batch' "
+	test_create_unique_files 2 4 files_base_dir1 &&
+	GIT_TEST_FSYNC=1 git $BATCH_CONFIGURATION add -- ./files_base_dir1/ &&
+	git ls-files --stage files_base_dir1/ |
+	test_parse_ls_files_stage_oids >added_files_oids &&
+
+	# We created 2 subdirs with 4 files each (8 files total) above
+	test_line_count = 8 added_files_oids &&
+	git cat-file --batch-check='%(objectname)' <added_files_oids >added_files_actual &&
+	test_cmp added_files_oids added_files_actual
+"
+
+test_expect_success 'git update-index: core.fsyncmethod=batch' "
+	test_create_unique_files 2 4 files_base_dir2 &&
+	find files_base_dir2 ! -type d -print | xargs git $BATCH_CONFIGURATION update-index --add -- &&
+	git ls-files --stage files_base_dir2 |
+	test_parse_ls_files_stage_oids >added_files2_oids &&
+
+	# We created 2 subdirs with 4 files each (8 files total) above
+	test_line_count = 8 added_files2_oids &&
+	git cat-file --batch-check='%(objectname)' <added_files2_oids >added_files2_actual &&
+	test_cmp added_files2_oids added_files2_actual
+"
 
 test_expect_success \
 	'git add: Test that executable bit is not used if core.filemode=0' \
@@ -77,24 +116,32 @@ test_expect_success '.gitignore test setup' '
 
 test_expect_success '.gitignore is honored' '
 	git add . &&
-	! (git ls-files | grep "\\.ig")
+	git ls-files >files &&
+	sed -n "/\\.ig/p" <files >actual &&
+	test_must_be_empty actual
 '
 
 test_expect_success 'error out when attempting to add ignored ones without -f' '
 	test_must_fail git add a.?? &&
-	! (git ls-files | grep "\\.ig")
+	git ls-files >files &&
+	sed -n "/\\.ig/p" <files >actual &&
+	test_must_be_empty actual
 '
 
 test_expect_success 'error out when attempting to add ignored ones without -f' '
 	test_must_fail git add d.?? &&
-	! (git ls-files | grep "\\.ig")
+	git ls-files >files &&
+	sed -n "/\\.ig/p" <files >actual &&
+	test_must_be_empty actual
 '
 
 test_expect_success 'error out when attempting to add ignored ones but add others' '
 	touch a.if &&
 	test_must_fail git add a.?? &&
-	! (git ls-files | grep "\\.ig") &&
-	(git ls-files | grep a.if)
+	git ls-files >files &&
+	sed -n "/\\.ig/p" <files >actual &&
+	test_must_be_empty actual &&
+	grep a.if files
 '
 
 test_expect_success 'add ignored ones with -f' '
@@ -140,9 +187,9 @@ test_expect_success 'check correct prefix detection' '
 test_expect_success 'git add with filemode=0, symlinks=0, and unmerged entries' '
 	for s in 1 2 3
 	do
-		echo $s > stage$s
-		echo "100755 $(git hash-object -w stage$s) $s	file"
-		echo "120000 $(printf $s | git hash-object -w -t blob --stdin) $s	symlink"
+		echo $s > stage$s &&
+		echo "100755 $(git hash-object -w stage$s) $s	file" &&
+		echo "120000 $(printf $s | git hash-object -w -t blob --stdin) $s	symlink" || return 1
 	done | git update-index --index-info &&
 	git config core.filemode 0 &&
 	git config core.symlinks 0 &&
@@ -176,7 +223,7 @@ test_expect_success 'git add --refresh' '
 	git read-tree HEAD &&
 	case "$(git diff-index HEAD -- foo)" in
 	:100644" "*"M	foo") echo pass;;
-	*) echo fail; (exit 1);;
+	*) echo fail; false;;
 	esac &&
 	git add --refresh -- foo &&
 	test -z "$(git diff-index HEAD -- foo)"
@@ -196,6 +243,12 @@ test_expect_success 'git add --refresh with pathspec' '
 	grep baz actual
 '
 
+test_expect_success 'git add --refresh correctly reports no match error' "
+	echo \"fatal: pathspec ':(icase)nonexistent' did not match any files\" >expect &&
+	test_must_fail git add --refresh ':(icase)nonexistent' 2>actual &&
+	test_cmp expect actual
+"
+
 test_expect_success POSIXPERM,SANITY 'git add should fail atomically upon an unreadable file' '
 	git reset --hard &&
 	date >foo1 &&
@@ -241,14 +294,14 @@ test_expect_success POSIXPERM,SANITY 'git add (add.ignore-errors = false)' '
 rm -f foo2
 
 test_expect_success POSIXPERM,SANITY '--no-ignore-errors overrides config' '
-       git config add.ignore-errors 1 &&
-       git reset --hard &&
-       date >foo1 &&
-       date >foo2 &&
-       chmod 0 foo2 &&
-       test_must_fail git add --verbose --no-ignore-errors . &&
-       ! ( git ls-files foo1 | grep foo1 ) &&
-       git config add.ignore-errors 0
+	git config add.ignore-errors 1 &&
+	git reset --hard &&
+	date >foo1 &&
+	date >foo2 &&
+	chmod 0 foo2 &&
+	test_must_fail git add --verbose --no-ignore-errors . &&
+	! ( git ls-files foo1 | grep foo1 ) &&
+	git config add.ignore-errors 0
 '
 rm -f foo2
 
@@ -256,7 +309,7 @@ test_expect_success BSLASHPSPEC "git add 'fo\\[ou\\]bar' ignores foobar" '
 	git reset --hard &&
 	touch fo\[ou\]bar foobar &&
 	git add '\''fo\[ou\]bar'\'' &&
-	git ls-files fo\[ou\]bar | fgrep fo\[ou\]bar &&
+	git ls-files fo\[ou\]bar | grep -F fo\[ou\]bar &&
 	! ( git ls-files foobar | grep foobar )
 '
 
@@ -296,6 +349,40 @@ test_expect_success '"git add ." in empty repo' '
 	)
 '
 
+test_expect_success '"git add" a embedded repository' '
+	rm -fr outer && git init outer &&
+	(
+		cd outer &&
+		for i in 1 2
+		do
+			name=inner$i &&
+			git init $name &&
+			git -C $name commit --allow-empty -m $name ||
+				return 1
+		done &&
+		git add . 2>actual &&
+		cat >expect <<-EOF &&
+		warning: adding embedded git repository: inner1
+		hint: You${SQ}ve added another git repository inside your current repository.
+		hint: Clones of the outer repository will not contain the contents of
+		hint: the embedded repository and will not know how to obtain it.
+		hint: If you meant to add a submodule, use:
+		hint:
+		hint: 	git submodule add <url> inner1
+		hint:
+		hint: If you added this path by mistake, you can remove it from the
+		hint: index with:
+		hint:
+		hint: 	git rm --cached inner1
+		hint:
+		hint: See "git help submodule" for more information.
+		hint: Disable this message with "git config advice.addEmbeddedRepo false"
+		warning: adding embedded git repository: inner2
+		EOF
+		test_cmp expect actual
+	)
+'
+
 test_expect_success 'error on a repository with no commits' '
 	rm -fr empty &&
 	git init empty &&
@@ -304,7 +391,7 @@ test_expect_success 'error on a repository with no commits' '
 	error: '"'empty/'"' does not have a commit checked out
 	fatal: adding files failed
 	EOF
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 test_expect_success 'git add --dry-run of existing changed file' "
@@ -320,15 +407,14 @@ test_expect_success 'git add --dry-run of non-existing file' "
 
 test_expect_success 'git add --dry-run of an existing file output' "
 	echo \"fatal: pathspec 'ignored-file' did not match any files\" >expect &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 "
 
 cat >expect.err <<\EOF
 The following paths are ignored by one of your .gitignore files:
 ignored-file
 hint: Use -f if you really want to add them.
-hint: Turn this message off by running
-hint: "git config advice.addIgnoredFile false"
+hint: Disable this message with "git config advice.addIgnoredFile false"
 EOF
 cat >expect.out <<\EOF
 add 'track-this'
@@ -339,8 +425,12 @@ test_expect_success 'git add --dry-run --ignore-missing of non-existing file' '
 '
 
 test_expect_success 'git add --dry-run --ignore-missing of non-existing file output' '
-	test_i18ncmp expect.out actual.out &&
-	test_i18ncmp expect.err actual.err
+	test_cmp expect.out actual.out &&
+	test_cmp expect.err actual.err
+'
+
+test_expect_success 'git add --dry-run --interactive should fail' '
+	test_must_fail git add --dry-run --interactive
 '
 
 test_expect_success 'git add empty string should fail' '
@@ -386,6 +476,36 @@ test_expect_success POSIXPERM 'git add --chmod=[+-]x does not change the working
 	! test -x foo4
 '
 
+test_expect_success 'git add --chmod fails with non regular files (but updates the other paths)' '
+	git reset --hard &&
+	test_ln_s_add foo foo3 &&
+	touch foo4 &&
+	test_must_fail git add --chmod=+x foo3 foo4 2>stderr &&
+	test_grep "cannot chmod +x .foo3." stderr &&
+	test_mode_in_index 120000 foo3 &&
+	test_mode_in_index 100755 foo4
+'
+
+test_expect_success 'git add --chmod honors --dry-run' '
+	git reset --hard &&
+	echo foo >foo4 &&
+	git add foo4 &&
+	git add --chmod=+x --dry-run foo4 &&
+	test_mode_in_index 100644 foo4
+'
+
+test_expect_success 'git add --chmod --dry-run reports error for non regular files' '
+	git reset --hard &&
+	test_ln_s_add foo foo4 &&
+	test_must_fail git add --chmod=+x --dry-run foo4 2>stderr &&
+	test_grep "cannot chmod +x .foo4." stderr
+'
+
+test_expect_success 'git add --chmod --dry-run reports error for unmatched pathspec' '
+	test_must_fail git add --chmod=+x --dry-run nonexistent 2>stderr &&
+	test_grep "pathspec .nonexistent. did not match any files" stderr
+'
+
 test_expect_success 'no file status change if no pathspec is given' '
 	>foo5 &&
 	>foo6 &&
@@ -409,11 +529,17 @@ test_expect_success 'no file status change if no pathspec is given in subdir' '
 '
 
 test_expect_success 'all statuses changed in folder if . is given' '
-	rm -fr empty &&
-	git add --chmod=+x . &&
-	test $(git ls-files --stage | grep ^100644 | wc -l) -eq 0 &&
-	git add --chmod=-x . &&
-	test $(git ls-files --stage | grep ^100755 | wc -l) -eq 0
+	git init repo &&
+	(
+		cd repo &&
+		mkdir -p sub/dir &&
+		touch x y z sub/a sub/dir/b &&
+		git add -A &&
+		git add --chmod=+x . &&
+		test $(git ls-files --stage | grep ^100644 | wc -l) -eq 0 &&
+		git add --chmod=-x . &&
+		test $(git ls-files --stage | grep ^100755 | wc -l) -eq 0
+	)
 '
 
 test_expect_success CASE_INSENSITIVE_FS 'path is case-insensitive' '
diff --git a/t/t3701-add-interactive.sh b/t/t3701-add-interactive.sh
index fb73a84..bc55255 100755
--- a/t/t3701-add-interactive.sh
+++ b/t/t3701-add-interactive.sh
@@ -1,15 +1,12 @@
 #!/bin/sh
 
 test_description='add -i basic tests'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-terminal.sh
 
-if ! test_have_prereq PERL
-then
-	skip_all='skipping add -i tests, perl not available'
-	test_done
-fi
-
 diff_cmp () {
 	for x
 	do
@@ -43,6 +40,21 @@ force_color () {
 	)
 }
 
+test_expect_success 'warn about add.interactive.useBuiltin' '
+	cat >expect <<-\EOF &&
+	warning: the add.interactive.useBuiltin setting has been removed!
+	See its entry in '\''git help config'\'' for details.
+	No changes.
+	EOF
+
+	for v in = =true =false
+	do
+		git -c "add.interactive.useBuiltin$v" add -p >out 2>actual &&
+		test_must_be_empty out &&
+		test_cmp expect actual || return 1
+	done
+'
+
 test_expect_success 'setup (initial)' '
 	echo content >file &&
 	git add file &&
@@ -100,6 +112,15 @@ test_expect_success 'status works (commit)' '
 	grep "+1/-0 *+2/-0 file" output
 '
 
+test_expect_success 'update can stage deletions' '
+	>to-delete &&
+	git add to-delete &&
+	rm to-delete &&
+	test_write_lines u t "" | git add -i &&
+	git ls-files to-delete >output &&
+	test_must_be_empty output
+'
+
 test_expect_success 'setup expected' '
 	cat >expected <<-\EOF
 	index 180b47c..b6f2c08 100644
@@ -284,9 +305,11 @@ test_expect_success FILEMODE 'stage mode and hunk' '
 	echo content >>file &&
 	chmod +x file &&
 	printf "y\\ny\\n" | git add -p &&
-	git diff --cached file | grep "new mode" &&
-	git diff --cached file | grep "+content" &&
-	test -z "$(git diff file)"
+	git diff --cached file >out &&
+	grep "new mode" out &&
+	grep "+content" out &&
+	git diff file >out &&
+	test_must_be_empty out
 '
 
 # end of tests disabled when filemode is not usable
@@ -302,9 +325,9 @@ test_expect_success 'different prompts for mode change/deleted' '
 	git -c core.filemode=true add -p >actual &&
 	sed -n "s/^\(([0-9/]*) Stage .*?\).*/\1/p" actual >actual.filtered &&
 	cat >expect <<-\EOF &&
-	(1/1) Stage deletion [y,n,q,a,d,?]?
-	(1/2) Stage mode change [y,n,q,a,d,j,J,g,/,?]?
-	(2/2) Stage this hunk [y,n,q,a,d,K,g,/,e,?]?
+	(1/1) Stage deletion [y,n,q,a,d,p,?]?
+	(1/2) Stage mode change [y,n,q,a,d,j,J,g,/,p,?]?
+	(2/2) Stage this hunk [y,n,q,a,d,K,g,/,e,p,?]?
 	EOF
 	test_cmp expect actual.filtered
 '
@@ -312,18 +335,20 @@ test_expect_success 'different prompts for mode change/deleted' '
 test_expect_success 'correct message when there is nothing to do' '
 	git reset --hard &&
 	git add -p 2>err &&
-	test_i18ngrep "No changes" err &&
+	test_grep "No changes" err &&
 	printf "\\0123" >binary &&
 	git add binary &&
 	printf "\\0abc" >binary &&
 	git add -p 2>err &&
-	test_i18ngrep "Only binary files changed" err
+	test_grep "Only binary files changed" err
 '
 
 test_expect_success 'setup again' '
 	git reset --hard &&
 	test_chmod +x file &&
-	echo content >>file
+	echo content >>file &&
+	test_write_lines A B C D>file2 &&
+	git add file2
 '
 
 # Write the patch file with a new line at the top and bottom
@@ -338,13 +363,27 @@ test_expect_success 'setup patch' '
 	 content
 	+lastline
 	\ No newline at end of file
+	diff --git a/file2 b/file2
+	index 8422d40..35b930a 100644
+	--- a/file2
+	+++ b/file2
+	@@ -1,4 +1,5 @@
+	-A
+	+Z
+	 B
+	+Y
+	 C
+	-D
+	+X
 	EOF
 '
 
 # Expected output, diff is similar to the patch but w/ diff at the top
 test_expect_success 'setup expected' '
 	echo diff --git a/file b/file >expected &&
-	cat patch |sed "/^index/s/ 100644/ 100755/" >>expected &&
+	sed -e "/^index 180b47c/s/ 100644/ 100755/" \
+	    -e /1,5/s//1,4/ \
+	    -e /Y/d patch >>expected &&
 	cat >expected-output <<-\EOF
 	--- a/file
 	+++ b/file
@@ -363,16 +402,38 @@ test_expect_success 'setup expected' '
 	 content
 	+lastline
 	\ No newline at end of file
+	--- a/file2
+	+++ b/file2
+	@@ -1,4 +1,5 @@
+	-A
+	+Z
+	 B
+	+Y
+	 C
+	-D
+	+X
+	@@ -1,2 +1,2 @@
+	-A
+	+Z
+	 B
+	@@ -2,2 +2,3 @@
+	 B
+	+Y
+	 C
+	@@ -3,2 +4,2 @@
+	 C
+	-D
+	+X
 	EOF
 '
 
 # Test splitting the first patch, then adding both
-test_expect_success C_LOCALE_OUTPUT 'add first line works' '
+test_expect_success 'add first line works' '
 	git commit -am "clear local changes" &&
 	git apply patch &&
-	printf "%s\n" s y y | git add -p file 2>error |
-		sed -n -e "s/^([1-2]\/[1-2]) Stage this hunk[^@]*\(@@ .*\)/\1/" \
-		       -e "/^[-+@ \\\\]"/p  >output &&
+	test_write_lines s y y s y n y | git add -p 2>error >raw-output &&
+	sed -n -e "s/^([1-9]\/[1-9]) Stage this hunk[^@]*\(@@ .*\)/\1/" \
+	       -e "/^[-+@ \\\\]"/p raw-output >output &&
 	test_must_be_empty error &&
 	git diff --cached >diff &&
 	diff_cmp expected diff &&
@@ -436,7 +497,7 @@ test_expect_success 'adding an empty file' '
 
 		echo y | git checkout -p added-file -- >actual &&
 		test_path_is_file empty &&
-		test_i18ngrep "Apply addition to index and worktree" actual
+		test_grep "Apply addition to index and worktree" actual
 	)
 '
 
@@ -453,13 +514,13 @@ test_expect_success 'split hunk setup' '
 test_expect_success 'goto hunk' '
 	test_when_finished "git reset" &&
 	tr _ " " >expect <<-EOF &&
-	(2/2) Stage this hunk [y,n,q,a,d,K,g,/,e,?]? + 1:  -1,2 +1,3          +15
+	(2/2) Stage this hunk [y,n,q,a,d,K,g,/,e,p,?]? + 1:  -1,2 +1,3          +15
 	_ 2:  -2,4 +3,8          +21
 	go to which hunk? @@ -1,2 +1,3 @@
 	_10
 	+15
 	_20
-	(1/2) Stage this hunk [y,n,q,a,d,j,J,g,/,e,?]?_
+	(1/2) Stage this hunk [y,n,q,a,d,j,J,g,/,e,p,?]?_
 	EOF
 	test_write_lines s y g 1 | git add -p >actual &&
 	tail -n 7 <actual >actual.trimmed &&
@@ -469,11 +530,11 @@ test_expect_success 'goto hunk' '
 test_expect_success 'navigate to hunk via regex' '
 	test_when_finished "git reset" &&
 	tr _ " " >expect <<-EOF &&
-	(2/2) Stage this hunk [y,n,q,a,d,K,g,/,e,?]? @@ -1,2 +1,3 @@
+	(2/2) Stage this hunk [y,n,q,a,d,K,g,/,e,p,?]? @@ -1,2 +1,3 @@
 	_10
 	+15
 	_20
-	(1/2) Stage this hunk [y,n,q,a,d,j,J,g,/,e,?]?_
+	(1/2) Stage this hunk [y,n,q,a,d,j,J,g,/,e,p,?]?_
 	EOF
 	test_write_lines s y /1,2 | git add -p >actual &&
 	tail -n 5 <actual >actual.trimmed &&
@@ -497,7 +558,7 @@ test_expect_success 'split hunk "add -p (edit)"' '
 	! grep "^+15" actual
 '
 
-test_expect_failure 'split hunk "add -p (no, yes, edit)"' '
+test_expect_success 'split hunk "add -p (no, yes, edit)"' '
 	test_write_lines 5 10 20 21 30 31 40 50 60 >test &&
 	git reset &&
 	# test sequence is s(plit), n(o), y(es), e(dit)
@@ -521,7 +582,7 @@ test_expect_success 'split hunk with incomplete line at end' '
 	test_must_fail git grep --cached before
 '
 
-test_expect_failure 'edit, adding lines to the first hunk' '
+test_expect_success 'edit, adding lines to the first hunk' '
 	test_write_lines 10 11 20 30 40 50 51 60 >test &&
 	git reset &&
 	tr _ " " >patch <<-EOF &&
@@ -549,8 +610,8 @@ test_expect_success 'patch mode ignores unmerged entries' '
 	test_commit non-conflict &&
 	git checkout -b side &&
 	test_commit side conflict.t &&
-	git checkout master &&
-	test_commit master conflict.t &&
+	git checkout main &&
+	test_commit main conflict.t &&
 	test_must_fail git merge side &&
 	echo changed >non-conflict.t &&
 	echo y | git add -p >output &&
@@ -569,18 +630,148 @@ test_expect_success 'patch mode ignores unmerged entries' '
 	diff_cmp expected diff
 '
 
+test_expect_success 'index is refreshed after applying patch' '
+	git reset --hard &&
+	echo content >test &&
+	printf y | git add -p &&
+	git diff-files --exit-code
+'
+
 test_expect_success 'diffs can be colorized' '
 	git reset --hard &&
 
 	echo content >test &&
 	printf y >y &&
 	force_color git add -p >output 2>&1 <y &&
+	git diff-files --exit-code &&
 
 	# We do not want to depend on the exact coloring scheme
 	# git uses for diffs, so just check that we saw some kind of color.
 	grep "$(printf "\\033")" output
 '
 
+test_expect_success 'colors can be overridden' '
+	git reset --hard &&
+	test_when_finished "git rm -f color-test" &&
+	test_write_lines context old more-context >color-test &&
+	git add color-test &&
+	test_write_lines context new more-context another-one >color-test &&
+
+	echo trigger an error message >input &&
+	force_color git \
+		-c color.interactive.error=blue \
+		add -i 2>err.raw <input &&
+	test_decode_color <err.raw >err &&
+	grep "<BLUE>Huh (trigger)?<RESET>" err &&
+
+	test_write_lines help quit >input &&
+	force_color git \
+		-c color.interactive.header=red \
+		-c color.interactive.help=green \
+		-c color.interactive.prompt=yellow \
+		add -i >actual.raw <input &&
+	test_decode_color <actual.raw >actual &&
+	cat >expect <<-\EOF &&
+	<RED>           staged     unstaged path<RESET>
+	  1:        +3/-0        +2/-1 color-test
+
+	<RED>*** Commands ***<RESET>
+	  1: <YELLOW>s<RESET>tatus	  2: <YELLOW>u<RESET>pdate	  3: <YELLOW>r<RESET>evert	  4: <YELLOW>a<RESET>dd untracked
+	  5: <YELLOW>p<RESET>atch	  6: <YELLOW>d<RESET>iff	  7: <YELLOW>q<RESET>uit	  8: <YELLOW>h<RESET>elp
+	<YELLOW>What now<RESET>> <GREEN>status        - show paths with changes<RESET>
+	<GREEN>update        - add working tree state to the staged set of changes<RESET>
+	<GREEN>revert        - revert staged set of changes back to the HEAD version<RESET>
+	<GREEN>patch         - pick hunks and update selectively<RESET>
+	<GREEN>diff          - view diff between HEAD and index<RESET>
+	<GREEN>add untracked - add contents of untracked files to the staged set of changes<RESET>
+	<RED>*** Commands ***<RESET>
+	  1: <YELLOW>s<RESET>tatus	  2: <YELLOW>u<RESET>pdate	  3: <YELLOW>r<RESET>evert	  4: <YELLOW>a<RESET>dd untracked
+	  5: <YELLOW>p<RESET>atch	  6: <YELLOW>d<RESET>iff	  7: <YELLOW>q<RESET>uit	  8: <YELLOW>h<RESET>elp
+	<YELLOW>What now<RESET>> Bye.
+	EOF
+	test_cmp expect actual &&
+
+	: exercise recolor_hunk by editing and then look at the hunk again &&
+	test_write_lines s e K q >input &&
+	force_color git \
+		-c color.interactive.prompt=yellow \
+		-c color.diff.meta=italic \
+		-c color.diff.frag=magenta \
+		-c color.diff.context=cyan \
+		-c color.diff.old=bold \
+		-c color.diff.new=blue \
+		-c core.editor=touch \
+		add -p >actual.raw <input &&
+	test_decode_color <actual.raw >actual.decoded &&
+	sed "s/index [0-9a-f]*\\.\\.[0-9a-f]* 100644/<INDEX-LINE>/" <actual.decoded >actual &&
+	cat >expect <<-\EOF &&
+	<ITALIC>diff --git a/color-test b/color-test<RESET>
+	<ITALIC><INDEX-LINE><RESET>
+	<ITALIC>--- a/color-test<RESET>
+	<ITALIC>+++ b/color-test<RESET>
+	<MAGENTA>@@ -1,3 +1,4 @@<RESET>
+	<CYAN> context<RESET>
+	<BOLD>-old<RESET>
+	<BLUE>+<RESET><BLUE>new<RESET>
+	<CYAN> more-context<RESET>
+	<BLUE>+<RESET><BLUE>another-one<RESET>
+	<YELLOW>(1/1) Stage this hunk [y,n,q,a,d,s,e,p,?]? <RESET><BOLD>Split into 2 hunks.<RESET>
+	<MAGENTA>@@ -1,3 +1,3 @@<RESET>
+	<CYAN> context<RESET>
+	<BOLD>-old<RESET>
+	<BLUE>+<RESET><BLUE>new<RESET>
+	<CYAN> more-context<RESET>
+	<YELLOW>(1/2) Stage this hunk [y,n,q,a,d,j,J,g,/,e,p,?]? <RESET><MAGENTA>@@ -3 +3,2 @@<RESET>
+	<CYAN> more-context<RESET>
+	<BLUE>+<RESET><BLUE>another-one<RESET>
+	<YELLOW>(2/2) Stage this hunk [y,n,q,a,d,K,g,/,e,p,?]? <RESET><MAGENTA>@@ -1,3 +1,3 @@<RESET>
+	<CYAN> context<RESET>
+	<BOLD>-old<RESET>
+	<BLUE>+new<RESET>
+	<CYAN> more-context<RESET>
+	<YELLOW>(1/2) Stage this hunk [y,n,q,a,d,j,J,g,/,e,p,?]? <RESET>
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'brackets appear without color' '
+	git reset --hard &&
+	test_when_finished "git rm -f bracket-test" &&
+	test_write_lines context old more-context >bracket-test &&
+	git add bracket-test &&
+	test_write_lines context new more-context another-one >bracket-test &&
+
+	test_write_lines quit >input &&
+	git add -i >actual <input &&
+
+	sed "s/^|//" >expect <<-\EOF &&
+	|           staged     unstaged path
+	|  1:        +3/-0        +2/-1 bracket-test
+	|
+	|*** Commands ***
+	|  1: [s]tatus	  2: [u]pdate	  3: [r]evert	  4: [a]dd untracked
+	|  5: [p]atch	  6: [d]iff	  7: [q]uit	  8: [h]elp
+	|What now> Bye.
+	EOF
+
+	test_cmp expect actual
+'
+
+test_expect_success 'colors can be skipped with color.ui=false' '
+	git reset --hard &&
+	test_when_finished "git rm -f color-test" &&
+	test_write_lines context old more-context >color-test &&
+	git add color-test &&
+	test_write_lines context new more-context another-one >color-test &&
+
+	test_write_lines help quit >input &&
+	force_color git \
+		-c color.ui=false \
+		add -i >actual.raw <input &&
+	test_decode_color <actual.raw >actual &&
+	test_cmp actual.raw actual
+'
+
 test_expect_success 'colorized diffs respect diff.wsErrorHighlight' '
 	git reset --hard &&
 
@@ -611,9 +802,33 @@ test_expect_success 'detect bogus diffFilter output' '
 	git reset --hard &&
 
 	echo content >test &&
-	test_config interactive.diffFilter "sed 1d" &&
+	test_config interactive.diffFilter "sed 6d" &&
 	printf y >y &&
-	force_color test_must_fail git add -p <y
+	force_color test_must_fail git add -p <y >output 2>&1 &&
+	grep "mismatched output" output
+'
+
+test_expect_success 'handle iffy colored hunk headers' '
+	git reset --hard &&
+
+	echo content >test &&
+	printf n >n &&
+	force_color git -c interactive.diffFilter="sed s/.*@@.*/XX/" \
+		add -p >output 2>&1 <n &&
+	grep "^XX$" output
+'
+
+test_expect_success 'handle very large filtered diff' '
+	git reset --hard &&
+	# The specific number here is not important, but it must
+	# be large enough that the output of "git diff --color"
+	# fills up the pipe buffer. 10,000 results in ~200k of
+	# colored output.
+	test_seq 10000 >test &&
+	test_config interactive.diffFilter cat &&
+	printf y >y &&
+	force_color git add -p >output 2>&1 <y &&
+	git diff-files --exit-code -- test
 '
 
 test_expect_success 'diff.algorithm is passed to `git diff-files`' '
@@ -623,7 +838,7 @@ test_expect_success 'diff.algorithm is passed to `git diff-files`' '
 	git add file &&
 	echo changed >file &&
 	test_must_fail git -c diff.algorithm=bogus add -p 2>err &&
-	test_i18ngrep "error: option diff-algorithm accepts " err
+	test_grep "error: option diff-algorithm accepts " err
 '
 
 test_expect_success 'patch-mode via -i prompts for files' '
@@ -757,6 +972,12 @@ test_expect_success 'setup different kinds of dirty submodules' '
 	cat >expected <<-\EOF &&
 	dirty-both-ways
 	dirty-head
+	EOF
+	test_cmp expected actual &&
+	git -C for-submodules diff-files --name-only --ignore-submodules=none >actual &&
+	cat >expected <<-\EOF &&
+	dirty-both-ways
+	dirty-head
 	dirty-otherwise
 	EOF
 	test_cmp expected actual &&
@@ -775,6 +996,18 @@ test_expect_success 'status ignores dirty submodules (except HEAD)' '
 	! grep dirty-otherwise output
 '
 
+test_expect_success 'handle submodules' '
+	echo 123 >>for-submodules/dirty-otherwise/initial.t &&
+
+	force_color git -C for-submodules add -p dirty-otherwise >output 2>&1 &&
+	grep "No changes" output &&
+
+	force_color git -C for-submodules add -p dirty-head >output 2>&1 <y &&
+	git -C for-submodules ls-files --stage dirty-head >actual &&
+	rev="$(git -C for-submodules/dirty-head rev-parse HEAD)" &&
+	grep "$rev" actual
+'
+
 test_expect_success 'set up pathological context' '
 	git reset --hard &&
 	test_write_lines a a a a a a a a a a a >a &&
@@ -814,6 +1047,44 @@ test_expect_success 'checkout -p works with pathological context lines' '
 	test_cmp expect a
 '
 
+# This should be called from a subshell as it sets a temporary editor
+setup_new_file() {
+	write_script new-file-editor.sh <<-\EOF &&
+	sed /^#/d "$1" >patch &&
+	sed /^+c/d patch >"$1"
+	EOF
+	test_set_editor "$(pwd)/new-file-editor.sh" &&
+	test_write_lines a b c d e f >new-file &&
+	test_write_lines a b d e f >new-file-expect &&
+	test_write_lines "@@ -0,0 +1,6 @@" +a +b +c +d +e +f >patch-expect
+}
+
+test_expect_success 'add -N followed by add -p patch editing' '
+	git reset --hard &&
+	(
+		setup_new_file &&
+		git add -N new-file &&
+		test_write_lines e n q | git add -p &&
+		git cat-file blob :new-file >actual &&
+		test_cmp new-file-expect actual &&
+		test_cmp patch-expect patch
+	)
+'
+
+test_expect_success 'checkout -p patch editing of added file' '
+	git reset --hard &&
+	(
+		setup_new_file &&
+		git add new-file &&
+		git commit -m "add new file" &&
+		git rm new-file &&
+		git commit -m "remove new file" &&
+		test_write_lines e n q | git checkout -p HEAD^ &&
+		test_cmp new-file-expect new-file &&
+		test_cmp patch-expect patch
+	)
+'
+
 test_expect_success 'show help from add--helper' '
 	git reset --hard &&
 	cat >expect <<-EOF &&
@@ -835,7 +1106,28 @@ test_expect_success 'show help from add--helper' '
 	EOF
 	test_write_lines h | force_color git add -i >actual.colored &&
 	test_decode_color <actual.colored >actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
+'
+
+test_expect_success 'reset -p with unmerged files' '
+	test_when_finished "git checkout --force main" &&
+	test_commit one conflict &&
+	git checkout -B side HEAD^ &&
+	test_commit two conflict &&
+	test_must_fail git merge one &&
+
+	# this is a noop with only an unmerged entry
+	git reset -p &&
+
+	# add files that sort before and after unmerged entry
+	echo a >a &&
+	echo z >z &&
+	git add a z &&
+
+	# confirm that we can reset those files
+	printf "%s\n" y y | git reset -p &&
+	git diff-index --cached --diff-filter=u HEAD >staged &&
+	test_must_be_empty staged
 '
 
 test_done
diff --git a/t/t3702-add-edit.sh b/t/t3702-add-edit.sh
index 6c67664..82bfb2f 100755
--- a/t/t3702-add-edit.sh
+++ b/t/t3702-add-edit.sh
@@ -4,6 +4,8 @@
 #
 
 test_description='add -e basic tests'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 
@@ -98,7 +100,7 @@ EOF
 
 echo "#!$SHELL_PATH" >fake-editor.sh
 cat >> fake-editor.sh <<\EOF
-egrep -v '^index' "$1" >orig-patch &&
+grep -E -v '^index' "$1" >orig-patch &&
 mv -f patch "$1"
 EOF
 
diff --git a/t/t3703-add-magic-pathspec.sh b/t/t3703-add-magic-pathspec.sh
index 3ef525a..d840710 100755
--- a/t/t3703-add-magic-pathspec.sh
+++ b/t/t3703-add-magic-pathspec.sh
@@ -2,6 +2,7 @@
 
 test_description='magic pathspec tests using git-add'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
diff --git a/t/t3704-add-pathspec-file.sh b/t/t3704-add-pathspec-file.sh
index 9e35c1f..3aa59f6 100755
--- a/t/t3704-add-pathspec-file.sh
+++ b/t/t3704-add-pathspec-file.sh
@@ -2,6 +2,7 @@
 
 test_description='add --pathspec-from-file'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_tick
@@ -137,23 +138,23 @@ test_expect_success 'error conditions' '
 	>empty_list &&
 
 	test_must_fail git add --pathspec-from-file=list --interactive 2>err &&
-	test_i18ngrep -e "--pathspec-from-file is incompatible with --interactive/--patch" err &&
+	test_grep -e "options .--pathspec-from-file. and .--interactive/--patch. cannot be used together" err &&
 
 	test_must_fail git add --pathspec-from-file=list --patch 2>err &&
-	test_i18ngrep -e "--pathspec-from-file is incompatible with --interactive/--patch" err &&
+	test_grep -e "options .--pathspec-from-file. and .--interactive/--patch. cannot be used together" err &&
 
 	test_must_fail git add --pathspec-from-file=list --edit 2>err &&
-	test_i18ngrep -e "--pathspec-from-file is incompatible with --edit" err &&
+	test_grep -e "options .--pathspec-from-file. and .--edit. cannot be used together" err &&
 
 	test_must_fail git add --pathspec-from-file=list -- fileA.t 2>err &&
-	test_i18ngrep -e "--pathspec-from-file is incompatible with pathspec arguments" err &&
+	test_grep -e ".--pathspec-from-file. and pathspec arguments cannot be used together" err &&
 
 	test_must_fail git add --pathspec-file-nul 2>err &&
-	test_i18ngrep -e "--pathspec-file-nul requires --pathspec-from-file" err &&
+	test_grep -e "the option .--pathspec-file-nul. requires .--pathspec-from-file." err &&
 
 	# This case succeeds, but still prints to stderr
 	git add --pathspec-from-file=empty_list 2>err &&
-	test_i18ngrep -e "Nothing specified, nothing added." err
+	test_grep -e "Nothing specified, nothing added." err
 '
 
 test_done
diff --git a/t/t3705-add-sparse-checkout.sh b/t/t3705-add-sparse-checkout.sh
new file mode 100755
index 0000000..2bade9e
--- /dev/null
+++ b/t/t3705-add-sparse-checkout.sh
@@ -0,0 +1,236 @@
+#!/bin/sh
+
+test_description='git add in sparse checked out working trees'
+
+. ./test-lib.sh
+
+SPARSE_ENTRY_BLOB=""
+
+# Optionally take a printf format string to write to the sparse_entry file
+setup_sparse_entry () {
+	# 'sparse_entry' might already be in the index with the skip-worktree
+	# bit set. Remove it so that the subsequent git add can update it.
+	git update-index --force-remove sparse_entry &&
+	if test $# -eq 1
+	then
+		printf "$1" >sparse_entry
+	else
+		>sparse_entry
+	fi &&
+	git add sparse_entry &&
+	git update-index --skip-worktree sparse_entry &&
+	git config core.sparseCheckout false &&
+	git commit --allow-empty -m "ensure sparse_entry exists at HEAD" &&
+	SPARSE_ENTRY_BLOB=$(git rev-parse :sparse_entry)
+}
+
+test_sparse_entry_unchanged () {
+	echo "100644 $SPARSE_ENTRY_BLOB 0	sparse_entry" >expected &&
+	git ls-files --stage sparse_entry >actual &&
+	test_cmp expected actual
+}
+
+setup_gitignore () {
+	test_when_finished rm -f .gitignore &&
+	cat >.gitignore <<-EOF
+	*
+	!/sparse_entry
+	EOF
+}
+
+test_sparse_entry_unstaged () {
+	git diff --staged -- sparse_entry >diff &&
+	test_must_be_empty diff
+}
+
+test_expect_success 'setup' "
+	cat >sparse_error_header <<-EOF &&
+	The following paths and/or pathspecs matched paths that exist
+	outside of your sparse-checkout definition, so will not be
+	updated in the index:
+	EOF
+
+	cat >sparse_hint <<-EOF &&
+	hint: If you intend to update such entries, try one of the following:
+	hint: * Use the --sparse option.
+	hint: * Disable or modify the sparsity rules.
+	hint: Disable this message with \"git config advice.updateSparsePath false\"
+	EOF
+
+	echo sparse_entry | cat sparse_error_header - >sparse_entry_error &&
+	cat sparse_entry_error sparse_hint >error_and_hint
+"
+
+test_expect_success 'git add does not remove sparse entries' '
+	setup_sparse_entry &&
+	rm sparse_entry &&
+	test_must_fail git add sparse_entry 2>stderr &&
+	test_sparse_entry_unstaged &&
+	test_cmp error_and_hint stderr &&
+	test_sparse_entry_unchanged
+'
+
+test_expect_success 'git add -A does not remove sparse entries' '
+	setup_sparse_entry &&
+	rm sparse_entry &&
+	setup_gitignore &&
+	git add -A 2>stderr &&
+	test_must_be_empty stderr &&
+	test_sparse_entry_unchanged
+'
+
+test_expect_success 'git add . does not remove sparse entries' '
+	setup_sparse_entry &&
+	rm sparse_entry &&
+	setup_gitignore &&
+	test_must_fail git add . 2>stderr &&
+	test_sparse_entry_unstaged &&
+
+	cat sparse_error_header >expect &&
+	echo . >>expect &&
+	cat sparse_hint >>expect &&
+
+	test_cmp expect stderr &&
+	test_sparse_entry_unchanged
+'
+
+for opt in "" -f -u --ignore-removal --dry-run
+do
+	test_expect_success "git add${opt:+ $opt} does not update sparse entries" '
+		setup_sparse_entry &&
+		echo modified >sparse_entry &&
+		test_must_fail git add $opt sparse_entry 2>stderr &&
+		test_sparse_entry_unstaged &&
+		test_cmp error_and_hint stderr &&
+		test_sparse_entry_unchanged
+	'
+done
+
+test_expect_success 'git add --refresh does not update sparse entries' '
+	setup_sparse_entry &&
+	git ls-files --debug sparse_entry | grep mtime >before &&
+	test-tool chmtime -60 sparse_entry &&
+	test_must_fail git add --refresh sparse_entry 2>stderr &&
+	test_sparse_entry_unstaged &&
+	test_cmp error_and_hint stderr &&
+	git ls-files --debug sparse_entry | grep mtime >after &&
+	test_cmp before after
+'
+
+test_expect_success 'git add --chmod does not update sparse entries' '
+	setup_sparse_entry &&
+	test_must_fail git add --chmod=+x sparse_entry 2>stderr &&
+	test_sparse_entry_unstaged &&
+	test_cmp error_and_hint stderr &&
+	test_sparse_entry_unchanged &&
+	! test -x sparse_entry
+'
+
+test_expect_success 'git add --renormalize does not update sparse entries' '
+	test_when_finished rm .gitattributes &&
+	test_config core.autocrlf false &&
+	setup_sparse_entry "LINEONE\r\nLINETWO\r\n" &&
+	echo "sparse_entry text=auto" >.gitattributes &&
+	test_must_fail git add --renormalize sparse_entry 2>stderr &&
+	test_sparse_entry_unstaged &&
+	test_cmp error_and_hint stderr &&
+	test_sparse_entry_unchanged
+'
+
+test_expect_success 'git add --dry-run --ignore-missing warn on sparse path' '
+	setup_sparse_entry &&
+	rm sparse_entry &&
+	test_must_fail git add --dry-run --ignore-missing sparse_entry 2>stderr &&
+	test_sparse_entry_unstaged &&
+	test_cmp error_and_hint stderr &&
+	test_sparse_entry_unchanged
+'
+
+test_expect_success 'do not advice about sparse entries when they do not match the pathspec' '
+	setup_sparse_entry &&
+	test_must_fail git add nonexistent 2>stderr &&
+	grep "fatal: pathspec .nonexistent. did not match any files" stderr &&
+	! grep -F -f sparse_error_header stderr
+'
+
+test_expect_success 'do not warn when pathspec matches dense entries' '
+	setup_sparse_entry &&
+	echo modified >sparse_entry &&
+	>dense_entry &&
+	git add "*_entry" 2>stderr &&
+	test_must_be_empty stderr &&
+	test_sparse_entry_unchanged &&
+	git ls-files --error-unmatch dense_entry
+'
+
+test_expect_success 'git add fails outside of sparse-checkout definition' '
+	test_when_finished git sparse-checkout disable &&
+	test_commit a &&
+	git sparse-checkout init --no-cone &&
+	git sparse-checkout set a &&
+	echo >>sparse_entry &&
+
+	git update-index --no-skip-worktree sparse_entry &&
+	test_must_fail git add sparse_entry &&
+	test_sparse_entry_unstaged &&
+
+	test_must_fail git add --chmod=+x sparse_entry &&
+	test_sparse_entry_unstaged &&
+
+	test_must_fail git add --renormalize sparse_entry &&
+	test_sparse_entry_unstaged &&
+
+	# Avoid munging CRLFs to avoid an error message
+	git -c core.autocrlf=input add --sparse sparse_entry 2>stderr &&
+	test_must_be_empty stderr &&
+	git ls-files --stage >actual &&
+	grep "^100644 .*sparse_entry\$" actual &&
+
+	git add --sparse --chmod=+x sparse_entry 2>stderr &&
+	test_must_be_empty stderr &&
+	git ls-files --stage >actual &&
+	grep "^100755 .*sparse_entry\$" actual &&
+
+	git reset &&
+
+	# This will print a message over stderr on Windows.
+	git add --sparse --renormalize sparse_entry &&
+	git status --porcelain >actual &&
+	grep "^M  sparse_entry\$" actual
+'
+
+test_expect_success 'add obeys advice.updateSparsePath' '
+	setup_sparse_entry &&
+	test_must_fail git -c advice.updateSparsePath=false add sparse_entry 2>stderr &&
+	test_sparse_entry_unstaged &&
+	test_cmp sparse_entry_error stderr
+
+'
+
+test_expect_success 'add allows sparse entries with --sparse' '
+	git sparse-checkout set --no-cone a &&
+	echo modified >sparse_entry &&
+	test_must_fail git add sparse_entry &&
+	test_sparse_entry_unchanged &&
+	git add --sparse sparse_entry 2>stderr &&
+	test_must_be_empty stderr
+'
+
+test_expect_success 'can add files from non-sparse dir' '
+	git sparse-checkout set w !/x y/ &&
+	mkdir -p w x/y &&
+	touch w/f x/y/f &&
+	git add w/f x/y/f 2>stderr &&
+	test_must_be_empty stderr
+'
+
+test_expect_success 'refuse to add non-skip-worktree file from sparse dir' '
+	git sparse-checkout set !/x y/ !x/y/z &&
+	mkdir -p x/y/z &&
+	touch x/y/z/f &&
+	test_must_fail git add x/y/z/f 2>stderr &&
+	echo x/y/z/f | cat sparse_error_header - sparse_hint >expect &&
+	test_cmp expect stderr
+'
+
+test_done
diff --git a/t/t3800-mktag.sh b/t/t3800-mktag.sh
index d696aa4..d3e428f 100755
--- a/t/t3800-mktag.sh
+++ b/t/t3800-mktag.sh
@@ -4,6 +4,7 @@
 
 test_description='git mktag: tag object verify test'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 ###########################################################
@@ -12,10 +13,107 @@ test_description='git mktag: tag object verify test'
 # given in the expect.pat file.
 
 check_verify_failure () {
-	expect="$2"
+	subject=$1 &&
+	message=$2 &&
+	shift 2 &&
+
+	no_strict= &&
+	fsck_obj_ok= &&
+	no_strict= &&
+	while test $# != 0
+	do
+		case "$1" in
+		--no-strict)
+			no_strict=yes
+			;;
+		--fsck-obj-ok)
+			fsck_obj_ok=yes
+			;;
+		esac &&
+		shift
+	done &&
+
+	test_expect_success "fail with [--[no-]strict]: $subject" '
+		test_must_fail git mktag <tag.sig 2>err &&
+		if test -z "$no_strict"
+		then
+			test_must_fail git mktag <tag.sig 2>err2 &&
+			test_cmp err err2
+		else
+			git mktag --no-strict <tag.sig
+		fi
+	'
+
+	test_expect_success "setup: $subject" '
+		tag_ref=refs/tags/bad_tag &&
+
+		# Reset any leftover state from the last $subject
+		rm -rf bad-tag &&
+
+		git init --bare bad-tag &&
+		bad_tag=$(git -C bad-tag hash-object -t tag -w --stdin --literally <tag.sig)
+	'
+
+	test_expect_success "hash-object & fsck unreachable: $subject" '
+		if test -n "$fsck_obj_ok"
+		then
+			git -C bad-tag fsck
+		else
+			test_must_fail git -C bad-tag fsck
+		fi
+	'
+
+	test_expect_success "update-ref & fsck reachable: $subject" '
+		# Make sure the earlier test created it for us
+		git rev-parse "$bad_tag" &&
+
+		# The update-ref of the bad content will fail, do it
+		# anyway to see if it segfaults
+		test_might_fail git -C bad-tag update-ref "$tag_ref" "$bad_tag" &&
+
+		# Manually create the broken, we cannot do it with
+		# update-ref
+		test-tool -C bad-tag ref-store main delete-refs 0 msg "$tag_ref" &&
+		test-tool -C bad-tag ref-store main update-ref msg "$tag_ref" $bad_tag $ZERO_OID REF_SKIP_OID_VERIFICATION &&
+
+		# Unlike fsck-ing unreachable content above, this
+		# will always fail.
+		test_must_fail git -C bad-tag fsck
+	'
+
+	test_expect_success "for-each-ref: $subject" '
+		# Make sure the earlier test created it for us
+		git rev-parse "$bad_tag" &&
+
+		test-tool -C bad-tag ref-store main delete-refs 0 msg "$tag_ref" &&
+		test-tool -C bad-tag ref-store main update-ref msg "$tag_ref" $bad_tag $ZERO_OID REF_SKIP_OID_VERIFICATION &&
+
+		printf "%s tag\t%s\n" "$bad_tag" "$tag_ref" >expected &&
+		git -C bad-tag for-each-ref "$tag_ref" >actual &&
+		test_cmp expected actual &&
+
+		test_must_fail git -C bad-tag for-each-ref --format="%(*objectname)"
+	'
+
+	test_expect_success "fast-export & fast-import: $subject" '
+		# Make sure the earlier test created it for us
+		git rev-parse "$bad_tag" &&
+
+		test_must_fail git -C bad-tag fast-export --all &&
+		test_must_fail git -C bad-tag fast-export "$bad_tag"
+	'
+}
+
+test_expect_mktag_success() {
 	test_expect_success "$1" '
-		( test_must_fail git mktag <tag.sig 2>message ) &&
-		grep "$expect" message
+		git hash-object -t tag -w --stdin <tag.sig >expected &&
+		git fsck --strict &&
+
+		git mktag <tag.sig >hash &&
+		test_cmp expected hash &&
+		test_when_finished "git update-ref -d refs/tags/mytag $(cat hash)" &&
+		git update-ref refs/tags/mytag $(cat hash) $(test_oid zero) &&
+		git fsck --strict
 	'
 }
 
@@ -23,10 +121,24 @@ check_verify_failure () {
 # first create a commit, so we have a valid object/type
 # for the tag.
 test_expect_success 'setup' '
-	echo Hello >A &&
-	git update-index --add A &&
-	git commit -m "Initial commit" &&
-	head=$(git rev-parse --verify HEAD)
+	test_commit A &&
+	test_commit B &&
+	head=$(git rev-parse --verify HEAD) &&
+	head_parent=$(git rev-parse --verify HEAD~) &&
+	tree=$(git rev-parse HEAD^{tree}) &&
+	blob=$(git rev-parse --verify HEAD:B.t)
+'
+
+test_expect_success 'basic usage' '
+	cat >tag.sig <<-EOF &&
+	object $head
+	type commit
+	tag mytag
+	tagger T A Gger <tagger@example.com> 1206478233 -0500
+	EOF
+	git mktag <tag.sig &&
+	git mktag --end-of-options <tag.sig &&
+	test_expect_code 129 git mktag --unknown-option
 '
 
 ############################################################
@@ -37,33 +149,33 @@ too short for a tag
 EOF
 
 check_verify_failure 'Tag object length check' \
-	'^error: .*size wrong.*$'
+	'^error:.* missingObject:' 'strict'
 
 ############################################################
 #  2. object line label check
 
 cat >tag.sig <<EOF
-xxxxxx 139e9b33986b1c2670fff52c5067603117b3e895
+xxxxxx $head
 type tag
 tag mytag
 tagger . <> 0 +0000
 
 EOF
 
-check_verify_failure '"object" line label check' '^error: char0: .*"object "$'
+check_verify_failure '"object" line label check' '^error:.* missingObject:'
 
 ############################################################
-#  3. object line SHA1 check
+#  3. object line hash check
 
 cat >tag.sig <<EOF
-object zz9e9b33986b1c2670fff52c5067603117b3e895
+object $(echo $head | tr 0-9a-f z)
 type tag
 tag mytag
 tagger . <> 0 +0000
 
 EOF
 
-check_verify_failure '"object" line SHA1 check' '^error: char7: .*SHA1 hash$'
+check_verify_failure '"object" line check' '^error:.* badObjectSha1:'
 
 ############################################################
 #  4. type line label check
@@ -76,7 +188,7 @@ tagger . <> 0 +0000
 
 EOF
 
-check_verify_failure '"type" line label check' '^error: char.*: .*"\\ntype "$'
+check_verify_failure '"type" line label check' '^error:.* missingTypeEntry:'
 
 ############################################################
 #  5. type line eol check
@@ -84,7 +196,7 @@ check_verify_failure '"type" line label check' '^error: char.*: .*"\\ntype "$'
 echo "object $head" >tag.sig
 printf "type tagsssssssssssssssssssssssssssssss" >>tag.sig
 
-check_verify_failure '"type" line eol check' '^error: char.*: .*"\\n"$'
+check_verify_failure '"type" line eol check' '^error:.* unterminatedHeader:'
 
 ############################################################
 #  6. tag line label check #1
@@ -98,7 +210,7 @@ tagger . <> 0 +0000
 EOF
 
 check_verify_failure '"tag" line label check #1' \
-	'^error: char.*: no "tag " found$'
+	'^error:.* missingTagEntry:'
 
 ############################################################
 #  7. tag line label check #2
@@ -110,7 +222,7 @@ tag
 EOF
 
 check_verify_failure '"tag" line label check #2' \
-	'^error: char.*: no "tag " found$'
+	'^error:.* badType:'
 
 ############################################################
 #  8. type line type-name length check
@@ -122,21 +234,86 @@ tag mytag
 EOF
 
 check_verify_failure '"type" line type-name length check' \
-	'^error: char.*: type too long$'
+	'^error:.* badType:'
 
 ############################################################
-#  9. verify object (SHA1/type) check
+#  9. verify object (hash/type) check
 
 cat >tag.sig <<EOF
 object $(test_oid deadbeef)
+type tag
+tag mytag
+tagger . <> 0 +0000
+
+EOF
+
+check_verify_failure 'verify object (hash/type) check -- correct type, nonexisting object' \
+	'^fatal: could not read tagged object' \
+	--fsck-obj-ok
+
+cat >tag.sig <<EOF
+object $head
 type tagggg
 tag mytag
 tagger . <> 0 +0000
 
 EOF
 
-check_verify_failure 'verify object (SHA1/type) check' \
-	'^error: char7: could not verify object.*$'
+check_verify_failure 'verify object (hash/type) check -- made-up type, valid object' \
+	'^error:.* badType:'
+
+cat >tag.sig <<EOF
+object $(test_oid deadbeef)
+type tagggg
+tag mytag
+tagger . <> 0 +0000
+
+EOF
+
+check_verify_failure 'verify object (hash/type) check -- made-up type, nonexisting object' \
+	'^error:.* badType:'
+
+cat >tag.sig <<EOF
+object $head
+type tree
+tag mytag
+tagger . <> 0 +0000
+
+EOF
+
+check_verify_failure 'verify object (hash/type) check -- mismatched type, valid object' \
+	'^fatal: object.*tagged as.*tree.*but is.*commit' \
+	--fsck-obj-ok
+
+############################################################
+#  9.5. verify object (hash/type) check -- replacement
+
+test_expect_success 'setup replacement of commit -> commit and tree -> blob' '
+	git replace $head_parent $head &&
+	git replace -f $tree $blob
+'
+
+cat >tag.sig <<EOF
+object $head_parent
+type commit
+tag mytag
+tagger . <> 0 +0000
+
+EOF
+
+test_expect_mktag_success 'tag to a commit replaced by another commit'
+
+cat >tag.sig <<EOF
+object $tree
+type tree
+tag mytag
+tagger . <> 0 +0000
+
+EOF
+
+check_verify_failure 'verify object (hash/type) check -- mismatched type, valid object' \
+	'^fatal: object.*tagged as.*tree.*but is.*blob' \
+	--fsck-obj-ok
 
 ############################################################
 # 10. verify tag-name check
@@ -150,7 +327,9 @@ tagger . <> 0 +0000
 EOF
 
 check_verify_failure 'verify tag-name check' \
-	'^error: char.*: could not verify tag name$'
+	'^error:.* badTagName:' \
+	--no-strict \
+	--fsck-obj-ok
 
 ############################################################
 # 11. tagger line label check #1
@@ -164,7 +343,9 @@ This is filler
 EOF
 
 check_verify_failure '"tagger" line label check #1' \
-	'^error: char.*: could not find "tagger "$'
+	'^error:.* missingTaggerEntry:' \
+	--no-strict \
+	--fsck-obj-ok
 
 ############################################################
 # 12. tagger line label check #2
@@ -179,10 +360,12 @@ This is filler
 EOF
 
 check_verify_failure '"tagger" line label check #2' \
-	'^error: char.*: could not find "tagger "$'
+	'^error:.* missingTaggerEntry:' \
+	--no-strict \
+	--fsck-obj-ok
 
 ############################################################
-# 13. disallow missing tag author name
+# 13. allow missing tag author name like fsck
 
 cat >tag.sig <<EOF
 object $head
@@ -193,8 +376,7 @@ tagger  <> 0 +0000
 This is filler
 EOF
 
-check_verify_failure 'disallow missing tag author name' \
-	'^error: char.*: missing tagger name$'
+test_expect_mktag_success 'allow missing tag author name'
 
 ############################################################
 # 14. disallow missing tag author name
@@ -209,7 +391,9 @@ tagger T A Gger <
 EOF
 
 check_verify_failure 'disallow malformed tagger' \
-	'^error: char.*: malformed tagger field$'
+	'^error:.* badEmail:' \
+	--no-strict \
+	--fsck-obj-ok
 
 ############################################################
 # 15. allow empty tag email
@@ -222,12 +406,10 @@ tagger T A Gger <> 0 +0000
 
 EOF
 
-test_expect_success \
-    'allow empty tag email' \
-    'git mktag <tag.sig >.git/refs/tags/mytag 2>message'
+test_expect_mktag_success 'allow empty tag email'
 
 ############################################################
-# 16. disallow spaces in tag email
+# 16. allow spaces in tag email like fsck
 
 cat >tag.sig <<EOF
 object $head
@@ -237,8 +419,7 @@ tagger T A Gger <tag ger@example.com> 0 +0000
 
 EOF
 
-check_verify_failure 'disallow spaces in tag email' \
-	'^error: char.*: malformed tagger field$'
+test_expect_mktag_success 'allow spaces in tag email like fsck'
 
 ############################################################
 # 17. disallow missing tag timestamp
@@ -252,7 +433,7 @@ tagger T A Gger <tagger@example.com>__
 EOF
 
 check_verify_failure 'disallow missing tag timestamp' \
-	'^error: char.*: missing tag timestamp$'
+	'^error:.* badDate:'
 
 ############################################################
 # 18. detect invalid tag timestamp1
@@ -266,7 +447,7 @@ tagger T A Gger <tagger@example.com> Tue Mar 25 15:47:44 2008
 EOF
 
 check_verify_failure 'detect invalid tag timestamp1' \
-	'^error: char.*: missing tag timestamp$'
+	'^error:.* badDate:'
 
 ############################################################
 # 19. detect invalid tag timestamp2
@@ -280,7 +461,7 @@ tagger T A Gger <tagger@example.com> 2008-03-31T12:20:15-0500
 EOF
 
 check_verify_failure 'detect invalid tag timestamp2' \
-	'^error: char.*: malformed tag timestamp$'
+	'^error:.* badDate:'
 
 ############################################################
 # 20. detect invalid tag timezone1
@@ -294,7 +475,7 @@ tagger T A Gger <tagger@example.com> 1206478233 GMT
 EOF
 
 check_verify_failure 'detect invalid tag timezone1' \
-	'^error: char.*: malformed tag timezone$'
+	'^error:.* badTimezone:'
 
 ############################################################
 # 21. detect invalid tag timezone2
@@ -308,10 +489,10 @@ tagger T A Gger <tagger@example.com> 1206478233 +  30
 EOF
 
 check_verify_failure 'detect invalid tag timezone2' \
-	'^error: char.*: malformed tag timezone$'
+	'^error:.* badTimezone:'
 
 ############################################################
-# 22. detect invalid tag timezone3
+# 22. allow invalid tag timezone3 (the maximum is -1200/+1400)
 
 cat >tag.sig <<EOF
 object $head
@@ -321,8 +502,7 @@ tagger T A Gger <tagger@example.com> 1206478233 -1430
 
 EOF
 
-check_verify_failure 'detect invalid tag timezone3' \
-	'^error: char.*: malformed tag timezone$'
+test_expect_mktag_success 'allow invalid tag timezone'
 
 ############################################################
 # 23. detect invalid header entry
@@ -337,10 +517,29 @@ this line should not be here
 EOF
 
 check_verify_failure 'detect invalid header entry' \
-	'^error: char.*: trailing garbage in tag header$'
+	'^error:.* extraHeaderEntry:' \
+	--no-strict \
+	--fsck-obj-ok
 
-############################################################
-# 24. create valid tag
+test_expect_success 'invalid header entry config & fsck' '
+	test_must_fail git mktag <tag.sig &&
+	git mktag --no-strict <tag.sig &&
+
+	test_must_fail git -c fsck.extraHeaderEntry=error mktag <tag.sig &&
+	test_must_fail git -c fsck.extraHeaderEntry=error mktag --no-strict <tag.sig &&
+
+	test_must_fail git -c fsck.extraHeaderEntry=warn mktag <tag.sig &&
+	git -c fsck.extraHeaderEntry=warn mktag --no-strict <tag.sig &&
+
+	git -c fsck.extraHeaderEntry=ignore mktag <tag.sig &&
+	git -c fsck.extraHeaderEntry=ignore mktag --no-strict <tag.sig &&
+
+	git fsck &&
+	git -c fsck.extraHeaderEntry=warn fsck 2>err &&
+	grep "warning .*extraHeaderEntry:" err &&
+	test_must_fail git -c fsck.extraHeaderEntry=error 2>err fsck &&
+	grep "error .* extraHeaderEntry:" err
+'
 
 cat >tag.sig <<EOF
 object $head
@@ -348,18 +547,41 @@ type commit
 tag mytag
 tagger T A Gger <tagger@example.com> 1206478233 -0500
 
+
+this line comes after an extra newline
 EOF
 
-test_expect_success \
-    'create valid tag' \
-    'git mktag <tag.sig >.git/refs/tags/mytag 2>message'
+test_expect_mktag_success 'allow extra newlines at start of body'
+
+cat >tag.sig <<EOF
+object $head
+type commit
+tag mytag
+tagger T A Gger <tagger@example.com> 1206478233 -0500
+
+EOF
+
+test_expect_mktag_success 'allow a blank line before an empty body (1)'
+
+cat >tag.sig <<EOF
+object $head
+type commit
+tag mytag
+tagger T A Gger <tagger@example.com> 1206478233 -0500
+EOF
+
+test_expect_mktag_success 'allow no blank line before an empty body (2)'
 
 ############################################################
-# 25. check mytag
+# 24. create valid tag
 
-test_expect_success \
-    'check mytag' \
-    'git tag -l | grep mytag'
+cat >tag.sig <<EOF
+object $head
+type commit
+tag mytag
+tagger T A Gger <tagger@example.com> 1206478233 -0500
+EOF
 
+test_expect_mktag_success 'create valid tag object'
 
 test_done
diff --git a/t/t3900-i18n-commit.sh b/t/t3900-i18n-commit.sh
index d277a9f..f27d09c 100755
--- a/t/t3900-i18n-commit.sh
+++ b/t/t3900-i18n-commit.sh
@@ -45,7 +45,7 @@ test_expect_success 'UTF-8 invalid characters refused' '
 	printf "Commit message\n\nInvalid surrogate:\355\240\200\n" \
 		>"$HOME/invalid" &&
 	git commit -a -F "$HOME/invalid" 2>"$HOME"/stderr &&
-	test_i18ngrep "did not conform" "$HOME"/stderr
+	test_grep "did not conform" "$HOME"/stderr
 '
 
 test_expect_success 'UTF-8 overlong sequences rejected' '
@@ -55,7 +55,7 @@ test_expect_success 'UTF-8 overlong sequences rejected' '
 	printf "\340\202\251ommit message\n\nThis is not a space:\300\240\n" \
 		>"$HOME/invalid" &&
 	git commit -a -F "$HOME/invalid" 2>"$HOME"/stderr &&
-	test_i18ngrep "did not conform" "$HOME"/stderr
+	test_grep "did not conform" "$HOME"/stderr
 '
 
 test_expect_success 'UTF-8 non-characters refused' '
@@ -64,7 +64,7 @@ test_expect_success 'UTF-8 non-characters refused' '
 	printf "Commit message\n\nNon-character:\364\217\277\276\n" \
 		>"$HOME/invalid" &&
 	git commit -a -F "$HOME/invalid" 2>"$HOME"/stderr &&
-	test_i18ngrep "did not conform" "$HOME"/stderr
+	test_grep "did not conform" "$HOME"/stderr
 '
 
 test_expect_success 'UTF-8 non-characters refused' '
@@ -73,7 +73,7 @@ test_expect_success 'UTF-8 non-characters refused' '
 	printf "Commit message\n\nNon-character:\357\267\220\n" \
 		>"$HOME/invalid" &&
 	git commit -a -F "$HOME/invalid" 2>"$HOME"/stderr &&
-	test_i18ngrep "did not conform" "$HOME"/stderr
+	test_grep "did not conform" "$HOME"/stderr
 '
 
 for H in ISO8859-1 eucJP ISO-2022-JP
@@ -226,10 +226,6 @@ test_commit_autosquash_multi_encoding () {
 		git rev-list HEAD >actual &&
 		test_line_count = 3 actual &&
 		iconv -f $old -t UTF-8 "$TEST_DIRECTORY"/t3900/$msg >expect &&
-		if test $flag = squash; then
-			subject="$(head -1 expect)" &&
-			printf "\nsquash! %s\n" "$subject" >>expect
-		fi &&
 		git cat-file commit HEAD^ >raw &&
 		(sed "1,/^$/d" raw | iconv -f $new -t utf-8) >actual &&
 		test_cmp expect actual
diff --git a/t/t3901-i18n-patch.sh b/t/t3901-i18n-patch.sh
index 923eb01..4b37f78 100755
--- a/t/t3901-i18n-patch.sh
+++ b/t/t3901-i18n-patch.sh
@@ -5,6 +5,9 @@
 
 test_description='i18n settings and format-patch | am pipe'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 check_encoding () {
@@ -45,7 +48,7 @@ test_expect_success setup '
 
 	# the first commit on the side branch is UTF-8
 	test_tick &&
-	git checkout -b side master^ &&
+	git checkout -b side main^ &&
 	echo Another file >yours &&
 	git add yours &&
 	git commit -s -m "Second on side" &&
@@ -69,7 +72,7 @@ test_expect_success setup '
 test_expect_success 'format-patch output (ISO-8859-1)' '
 	git config i18n.logoutputencoding ISO8859-1 &&
 
-	git format-patch --stdout master..HEAD^ >out-l1 &&
+	git format-patch --stdout main..HEAD^ >out-l1 &&
 	git format-patch --stdout HEAD^ >out-l2 &&
 	grep "^Content-Type: text/plain; charset=ISO8859-1" out-l1 &&
 	grep "^From: =?ISO8859-1?q?=C1=E9=ED=20=F3=FA?=" out-l1 &&
@@ -80,7 +83,7 @@ test_expect_success 'format-patch output (ISO-8859-1)' '
 test_expect_success 'format-patch output (UTF-8)' '
 	git config i18n.logoutputencoding UTF-8 &&
 
-	git format-patch --stdout master..HEAD^ >out-u1 &&
+	git format-patch --stdout main..HEAD^ >out-u1 &&
 	git format-patch --stdout HEAD^ >out-u2 &&
 	grep "^Content-Type: text/plain; charset=UTF-8" out-u1 &&
 	grep "^From: =?UTF-8?q?=C3=81=C3=A9=C3=AD=20=C3=B3=C3=BA?=" out-u1 &&
@@ -102,7 +105,7 @@ test_expect_success 'rebase (U/U)' '
 	# we want UTF-8 encoded name.
 	. "$TEST_DIRECTORY"/t3901/utf8.txt &&
 	git checkout -b test &&
-	git rebase master &&
+	git rebase main &&
 
 	check_encoding 2
 '
@@ -113,7 +116,7 @@ test_expect_success 'rebase (U/L)' '
 	. "$TEST_DIRECTORY"/t3901/utf8.txt &&
 
 	git reset --hard side &&
-	git rebase master &&
+	git rebase main &&
 
 	check_encoding 2
 '
@@ -125,7 +128,7 @@ test_expect_success !MINGW 'rebase (L/L)' '
 	. "$TEST_DIRECTORY"/t3901/8859-1.txt &&
 
 	git reset --hard side &&
-	git rebase master &&
+	git rebase main &&
 
 	check_encoding 2 8859
 '
@@ -138,7 +141,7 @@ test_expect_success !MINGW 'rebase (L/U)' '
 	. "$TEST_DIRECTORY"/t3901/8859-1.txt &&
 
 	git reset --hard side &&
-	git rebase master &&
+	git rebase main &&
 
 	check_encoding 2 8859
 '
@@ -150,7 +153,7 @@ test_expect_success 'cherry-pick(U/U)' '
 	git config i18n.logoutputencoding UTF-8 &&
 	. "$TEST_DIRECTORY"/t3901/utf8.txt &&
 
-	git reset --hard master &&
+	git reset --hard main &&
 	git cherry-pick side^ &&
 	git cherry-pick side &&
 	git revert HEAD &&
@@ -165,7 +168,7 @@ test_expect_success !MINGW 'cherry-pick(L/L)' '
 	git config i18n.logoutputencoding ISO8859-1 &&
 	. "$TEST_DIRECTORY"/t3901/8859-1.txt &&
 
-	git reset --hard master &&
+	git reset --hard main &&
 	git cherry-pick side^ &&
 	git cherry-pick side &&
 	git revert HEAD &&
@@ -180,7 +183,7 @@ test_expect_success 'cherry-pick(U/L)' '
 	git config i18n.logoutputencoding ISO8859-1 &&
 	. "$TEST_DIRECTORY"/t3901/utf8.txt &&
 
-	git reset --hard master &&
+	git reset --hard main &&
 	git cherry-pick side^ &&
 	git cherry-pick side &&
 	git revert HEAD &&
@@ -196,7 +199,7 @@ test_expect_success !MINGW 'cherry-pick(L/U)' '
 	git config i18n.logoutputencoding UTF-8 &&
 	. "$TEST_DIRECTORY"/t3901/8859-1.txt &&
 
-	git reset --hard master &&
+	git reset --hard main &&
 	git cherry-pick side^ &&
 	git cherry-pick side &&
 	git revert HEAD &&
@@ -210,7 +213,7 @@ test_expect_success 'rebase --merge (U/U)' '
 	. "$TEST_DIRECTORY"/t3901/utf8.txt &&
 
 	git reset --hard side &&
-	git rebase --merge master &&
+	git rebase --merge main &&
 
 	check_encoding 2
 '
@@ -221,7 +224,7 @@ test_expect_success 'rebase --merge (U/L)' '
 	. "$TEST_DIRECTORY"/t3901/utf8.txt &&
 
 	git reset --hard side &&
-	git rebase --merge master &&
+	git rebase --merge main &&
 
 	check_encoding 2
 '
@@ -233,7 +236,7 @@ test_expect_success 'rebase --merge (L/L)' '
 	. "$TEST_DIRECTORY"/t3901/8859-1.txt &&
 
 	git reset --hard side &&
-	git rebase --merge master &&
+	git rebase --merge main &&
 
 	check_encoding 2 8859
 '
@@ -246,7 +249,7 @@ test_expect_success 'rebase --merge (L/U)' '
 	. "$TEST_DIRECTORY"/t3901/8859-1.txt &&
 
 	git reset --hard side &&
-	git rebase --merge master &&
+	git rebase --merge main &&
 
 	check_encoding 2 8859
 '
@@ -256,7 +259,7 @@ test_expect_success 'am (U/U)' '
 	git config i18n.commitencoding UTF-8 &&
 	. "$TEST_DIRECTORY"/t3901/utf8.txt &&
 
-	git reset --hard master &&
+	git reset --hard main &&
 	git am out-u1 out-u2 &&
 
 	check_encoding 2
@@ -267,7 +270,7 @@ test_expect_success !MINGW 'am (L/L)' '
 	git config i18n.commitencoding ISO8859-1 &&
 	. "$TEST_DIRECTORY"/t3901/8859-1.txt &&
 
-	git reset --hard master &&
+	git reset --hard main &&
 	git am out-l1 out-l2 &&
 
 	check_encoding 2 8859
@@ -277,7 +280,7 @@ test_expect_success 'am (U/L)' '
 	# Apply ISO-8859-1 patches with UTF-8 commitencoding
 	git config i18n.commitencoding UTF-8 &&
 	. "$TEST_DIRECTORY"/t3901/utf8.txt &&
-	git reset --hard master &&
+	git reset --hard main &&
 
 	# am specifies --utf8 by default.
 	git am out-l1 out-l2 &&
@@ -290,12 +293,12 @@ test_expect_success 'am --no-utf8 (U/L)' '
 	git config i18n.commitencoding UTF-8 &&
 	. "$TEST_DIRECTORY"/t3901/utf8.txt &&
 
-	git reset --hard master &&
+	git reset --hard main &&
 	git am --no-utf8 out-l1 out-l2 2>err &&
 
 	# commit-tree will warn that the commit message does not contain valid UTF-8
 	# as mailinfo did not convert it
-	test_i18ngrep "did not conform" err &&
+	test_grep "did not conform" err &&
 
 	check_encoding 2
 '
@@ -305,7 +308,7 @@ test_expect_success !MINGW 'am (L/U)' '
 	git config i18n.commitencoding ISO8859-1 &&
 	. "$TEST_DIRECTORY"/t3901/8859-1.txt &&
 
-	git reset --hard master &&
+	git reset --hard main &&
 	# mailinfo will re-code the commit message to the charset specified by
 	# i18n.commitencoding
 	git am out-u1 out-u2 &&
diff --git a/t/t3902-quoted.sh b/t/t3902-quoted.sh
index f528008..72a5a56 100755
--- a/t/t3902-quoted.sh
+++ b/t/t3902-quoted.sh
@@ -5,6 +5,7 @@
 
 test_description='quoted output'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 FN='濱野'
diff --git a/t/t3903-stash.sh b/t/t3903-stash.sh
index 9f7ca98..00db82f 100755
--- a/t/t3903-stash.sh
+++ b/t/t3903-stash.sh
@@ -5,7 +5,30 @@
 
 test_description='Test git stash'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-unique-files.sh
+
+test_expect_success 'usage on cmd and subcommand invalid option' '
+	test_expect_code 129 git stash --invalid-option 2>usage &&
+	grep "or: git stash" usage &&
+
+	test_expect_code 129 git stash push --invalid-option 2>usage &&
+	! grep "or: git stash" usage
+'
+
+test_expect_success 'usage on main command -h emits a summary of subcommands' '
+	test_expect_code 129 git stash -h >usage &&
+	grep -F "usage: git stash list" usage &&
+	grep -F "or: git stash show" usage
+'
+
+test_expect_success 'usage for subcommands should emit subcommand usage' '
+	test_expect_code 129 git stash push -h >usage &&
+	grep -F "usage: git stash [push" usage
+'
 
 diff_cmp () {
 	for i in "$1" "$2"
@@ -19,7 +42,7 @@ diff_cmp () {
 	rm -f "$1.compare" "$2.compare"
 }
 
-test_expect_success 'stash some dirty working directory' '
+setup_stash() {
 	echo 1 >file &&
 	git add file &&
 	echo unrelated >other-file &&
@@ -33,6 +56,10 @@ test_expect_success 'stash some dirty working directory' '
 	git stash &&
 	git diff-files --quiet &&
 	git diff-index --cached --quiet HEAD
+}
+
+test_expect_success 'stash some dirty working directory' '
+	setup_stash
 '
 
 cat >expect <<EOF
@@ -163,6 +190,43 @@ test_expect_success 'drop middle stash by index' '
 	test 1 = $(git show HEAD:file)
 '
 
+test_expect_success 'drop stash reflog updates refs/stash' '
+	git reset --hard &&
+	git rev-parse refs/stash >expect &&
+	echo 9 >file &&
+	git stash &&
+	git stash drop stash@{0} &&
+	git rev-parse refs/stash >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'drop stash reflog updates refs/stash with rewrite' '
+	git init repo &&
+	(
+		cd repo &&
+		setup_stash
+	) &&
+	echo 9 >repo/file &&
+
+	old_oid="$(git -C repo rev-parse stash@{0})" &&
+	git -C repo stash &&
+	new_oid="$(git -C repo rev-parse stash@{0})" &&
+
+	cat >expect <<-EOF &&
+	$new_oid
+	$old_oid
+	EOF
+	git -C repo reflog show refs/stash --format=%H >actual &&
+	test_cmp expect actual &&
+
+	git -C repo stash drop stash@{1} &&
+	git -C repo reflog show refs/stash --format=%H >actual &&
+	cat >expect <<-EOF &&
+	$new_oid
+	EOF
+	test_cmp expect actual
+'
+
 test_expect_success 'stash pop' '
 	git reset --hard &&
 	git stash pop &&
@@ -220,14 +284,14 @@ test_expect_success 'stash branch' '
 	git commit file -m second &&
 	git stash branch stashbranch &&
 	test refs/heads/stashbranch = $(git symbolic-ref HEAD) &&
-	test $(git rev-parse HEAD) = $(git rev-parse master^) &&
+	test $(git rev-parse HEAD) = $(git rev-parse main^) &&
 	git diff --cached >output &&
 	diff_cmp expect output &&
 	git diff >output &&
 	diff_cmp expect1 output &&
 	git add file &&
 	git commit -m alternate\ second &&
-	git diff master..stashbranch >output &&
+	git diff main..stashbranch >output &&
 	diff_cmp output expect2 &&
 	test 0 = $(git stash list | wc -l)
 '
@@ -239,6 +303,18 @@ test_expect_success 'apply -q is quiet' '
 	test_must_be_empty output.out
 '
 
+test_expect_success 'apply --index -q is quiet' '
+	# Added file, deleted file, modified file all staged for commit
+	echo foo >new-file &&
+	echo test >file &&
+	git add new-file file &&
+	git rm other-file &&
+
+	git stash &&
+	git stash apply --index -q >output.out 2>&1 &&
+	test_must_be_empty output.out
+'
+
 test_expect_success 'save -q is quiet' '
 	git stash save --quiet >output.out 2>&1 &&
 	test_must_be_empty output.out
@@ -269,6 +345,27 @@ test_expect_success 'drop -q is quiet' '
 	test_must_be_empty output.out
 '
 
+test_expect_success 'stash push -q --staged refreshes the index' '
+	git reset --hard &&
+	echo test >file &&
+	git add file &&
+	git stash push -q --staged &&
+	git diff-files >output.out &&
+	test_must_be_empty output.out
+'
+
+test_expect_success 'stash apply -q --index refreshes the index' '
+	echo test >other-file &&
+	git add other-file &&
+	echo another-change >other-file &&
+	git diff-files >expect &&
+	git stash &&
+
+	git stash apply -q --index &&
+	git diff-files >actual &&
+	test_cmp expect actual
+'
+
 test_expect_success 'stash -k' '
 	echo bar3 >file &&
 	echo bar4 >file2 &&
@@ -285,9 +382,20 @@ test_expect_success 'stash --no-keep-index' '
 	test bar,bar2 = $(cat file),$(cat file2)
 '
 
+test_expect_success 'stash --staged' '
+	echo bar3 >file &&
+	echo bar4 >file2 &&
+	git add file2 &&
+	git stash --staged &&
+	test bar3,bar2 = $(cat file),$(cat file2) &&
+	git reset --hard &&
+	git stash pop &&
+	test bar,bar4 = $(cat file),$(cat file2)
+'
+
 test_expect_success 'dont assume push with non-option args' '
 	test_must_fail git stash -q drop 2>err &&
-	test_i18ngrep -e "subcommand wasn'\''t specified; '\''push'\'' can'\''t be assumed due to unexpected token '\''drop'\''" err
+	test_grep -e "subcommand wasn'\''t specified; '\''push'\'' can'\''t be assumed due to unexpected token '\''drop'\''" err
 '
 
 test_expect_success 'stash --invalid-option' '
@@ -357,10 +465,11 @@ test_expect_success SYMLINKS 'stash file to symlink' '
 	rm file &&
 	ln -s file2 file &&
 	git stash save "file to symlink" &&
-	test -f file &&
+	test_path_is_file_not_symlink file &&
 	test bar = "$(cat file)" &&
 	git stash apply &&
-	case "$(ls -l file)" in *" file -> file2") :;; *) false;; esac
+	test_path_is_symlink file &&
+	test "$(test_readlink file)" = file2
 '
 
 test_expect_success SYMLINKS 'stash file to symlink (stage rm)' '
@@ -368,10 +477,11 @@ test_expect_success SYMLINKS 'stash file to symlink (stage rm)' '
 	git rm file &&
 	ln -s file2 file &&
 	git stash save "file to symlink (stage rm)" &&
-	test -f file &&
+	test_path_is_file_not_symlink file &&
 	test bar = "$(cat file)" &&
 	git stash apply &&
-	case "$(ls -l file)" in *" file -> file2") :;; *) false;; esac
+	test_path_is_symlink file &&
+	test "$(test_readlink file)" = file2
 '
 
 test_expect_success SYMLINKS 'stash file to symlink (full stage)' '
@@ -380,10 +490,11 @@ test_expect_success SYMLINKS 'stash file to symlink (full stage)' '
 	ln -s file2 file &&
 	git add file &&
 	git stash save "file to symlink (full stage)" &&
-	test -f file &&
+	test_path_is_file_not_symlink file &&
 	test bar = "$(cat file)" &&
 	git stash apply &&
-	case "$(ls -l file)" in *" file -> file2") :;; *) false;; esac
+	test_path_is_symlink file &&
+	test "$(test_readlink file)" = file2
 '
 
 # This test creates a commit with a symlink used for the following tests
@@ -454,7 +565,7 @@ test_expect_failure 'stash directory to file' '
 	rm -fr dir &&
 	echo bar >dir &&
 	git stash save "directory to file" &&
-	test -d dir &&
+	test_path_is_dir dir &&
 	test foo = "$(cat dir/file)" &&
 	test_must_fail git stash apply &&
 	test bar = "$(cat dir)" &&
@@ -467,10 +578,10 @@ test_expect_failure 'stash file to directory' '
 	mkdir file &&
 	echo foo >file/file &&
 	git stash save "file to directory" &&
-	test -f file &&
+	test_path_is_file file &&
 	test bar = "$(cat file)" &&
 	git stash apply &&
-	test -f file/file &&
+	test_path_is_file file/file &&
 	test foo = "$(cat file/file)"
 '
 
@@ -485,7 +596,7 @@ test_expect_success 'giving too many ref arguments does not modify files' '
 	for type in apply pop "branch stash-branch"
 	do
 		test_must_fail git stash $type stash@{0} stash@{1} 2>err &&
-		test_i18ngrep "Too many revisions" err &&
+		test_grep "Too many revisions" err &&
 		test 123456789 = $(test-tool chmtime -g file2) || return 1
 	done
 '
@@ -493,14 +604,14 @@ test_expect_success 'giving too many ref arguments does not modify files' '
 test_expect_success 'drop: too many arguments errors out (does nothing)' '
 	git stash list >expect &&
 	test_must_fail git stash drop stash@{0} stash@{1} 2>err &&
-	test_i18ngrep "Too many revisions" err &&
+	test_grep "Too many revisions" err &&
 	git stash list >actual &&
 	test_cmp expect actual
 '
 
 test_expect_success 'show: too many arguments errors out (does nothing)' '
 	test_must_fail git stash show stash@{0} stash@{1} 2>err 1>out &&
-	test_i18ngrep "Too many revisions" err &&
+	test_grep "Too many revisions" err &&
 	test_must_be_empty out
 '
 
@@ -520,7 +631,7 @@ test_expect_success 'stash branch - no stashes on stack, stash-like argument' '
 	STASH_ID=$(git stash create) &&
 	git reset --hard &&
 	git stash branch stash-branch ${STASH_ID} &&
-	test_when_finished "git reset --hard HEAD && git checkout master &&
+	test_when_finished "git reset --hard HEAD && git checkout main &&
 	git branch -D stash-branch" &&
 	test $(git ls-files --modified | wc -l) -eq 1
 '
@@ -536,14 +647,14 @@ test_expect_success 'stash branch - stashes on stack, stash-like argument' '
 	STASH_ID=$(git stash create) &&
 	git reset --hard &&
 	git stash branch stash-branch ${STASH_ID} &&
-	test_when_finished "git reset --hard HEAD && git checkout master &&
+	test_when_finished "git reset --hard HEAD && git checkout main &&
 	git branch -D stash-branch" &&
 	test $(git ls-files --modified | wc -l) -eq 1
 '
 
 test_expect_success 'stash branch complains with no arguments' '
 	test_must_fail git stash branch 2>err &&
-	test_i18ngrep "No branch name specified" err
+	test_grep "No branch name specified" err
 '
 
 test_expect_success 'stash show format defaults to --stat' '
@@ -561,7 +672,7 @@ test_expect_success 'stash show format defaults to --stat' '
 	 1 file changed, 1 insertion(+)
 	EOF
 	git stash show ${STASH_ID} >actual &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 test_expect_success 'stash show - stashes on stack, stash-like argument' '
@@ -738,7 +849,7 @@ test_expect_success 'valid ref of the form "n", n < N' '
 	git stash &&
 	git stash show 0 &&
 	git stash branch tmp 0 &&
-	git checkout master &&
+	git checkout main &&
 	git stash &&
 	git stash apply 0 &&
 	git reset --hard &&
@@ -755,7 +866,7 @@ test_expect_success 'branch: do not drop the stash if the branch exists' '
 	git commit -m initial &&
 	echo bar >file &&
 	git stash &&
-	test_must_fail git stash branch master stash@{0} &&
+	test_must_fail git stash branch main stash@{0} &&
 	git rev-parse stash@{0} --
 '
 
@@ -768,7 +879,7 @@ test_expect_success 'branch: should not drop the stash if the apply fails' '
 	echo bar >file &&
 	git stash &&
 	echo baz >file &&
-	test_when_finished "git checkout master" &&
+	test_when_finished "git checkout main" &&
 	test_must_fail git stash branch new_branch stash@{0} &&
 	git rev-parse stash@{0} --
 '
@@ -789,7 +900,7 @@ test_expect_success 'apply: show same status as git status (relative to ./)' '
 		git stash apply
 	) |
 	sed -e 1d >actual && # drop "Saved..."
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 cat >expect <<EOF
@@ -820,6 +931,10 @@ test_expect_success 'store called with invalid commit' '
 	test_must_fail git stash store foo
 '
 
+test_expect_success 'store called with non-stash commit' '
+	test_must_fail git stash store HEAD
+'
+
 test_expect_success 'store updates stash ref and reflog' '
 	git stash clear &&
 	git reset --hard &&
@@ -856,7 +971,7 @@ test_expect_success 'setup stash with index and worktree changes' '
 	git stash
 '
 
-test_expect_success 'stash list implies --first-parent -m' '
+test_expect_success 'stash list -p shows simple diff' '
 	cat >expect <<-EOF &&
 	stash@{0}
 
@@ -902,7 +1017,7 @@ test_expect_success 'push -m shows right message' '
 	>foo &&
 	git add foo &&
 	git stash push -m "test message" &&
-	echo "stash@{0}: On master: test message" >expect &&
+	echo "stash@{0}: On main: test message" >expect &&
 	git stash list -1 >actual &&
 	test_cmp expect actual
 '
@@ -911,7 +1026,7 @@ test_expect_success 'push -m also works without space' '
 	>foo &&
 	git add foo &&
 	git stash push -m"unspaced test message" &&
-	echo "stash@{0}: On master: unspaced test message" >expect &&
+	echo "stash@{0}: On main: unspaced test message" >expect &&
 	git stash list -1 >actual &&
 	test_cmp expect actual
 '
@@ -968,7 +1083,7 @@ test_expect_success 'push -mfoo uses right message' '
 	>foo &&
 	git add foo &&
 	git stash push -m"test mfoo" &&
-	echo "stash@{0}: On master: test mfoo" >expect &&
+	echo "stash@{0}: On main: test mfoo" >expect &&
 	git stash list -1 >actual &&
 	test_cmp expect actual
 '
@@ -977,7 +1092,7 @@ test_expect_success 'push --message foo is synonym for -mfoo' '
 	>foo &&
 	git add foo &&
 	git stash push --message "test message foo" &&
-	echo "stash@{0}: On master: test message foo" >expect &&
+	echo "stash@{0}: On main: test message foo" >expect &&
 	git stash list -1 >actual &&
 	test_cmp expect actual
 '
@@ -986,7 +1101,7 @@ test_expect_success 'push --message=foo is synonym for -mfoo' '
 	>foo &&
 	git add foo &&
 	git stash push --message="test message=foo" &&
-	echo "stash@{0}: On master: test message=foo" >expect &&
+	echo "stash@{0}: On main: test message=foo" >expect &&
 	git stash list -1 >actual &&
 	test_cmp expect actual
 '
@@ -995,7 +1110,7 @@ test_expect_success 'push -m shows right message' '
 	>foo &&
 	git add foo &&
 	git stash push -m "test m foo" &&
-	echo "stash@{0}: On master: test m foo" >expect &&
+	echo "stash@{0}: On main: test m foo" >expect &&
 	git stash list -1 >actual &&
 	test_cmp expect actual
 '
@@ -1004,7 +1119,18 @@ test_expect_success 'create stores correct message' '
 	>foo &&
 	git add foo &&
 	STASH_ID=$(git stash create "create test message") &&
-	echo "On master: create test message" >expect &&
+	echo "On main: create test message" >expect &&
+	git show --pretty=%s -s ${STASH_ID} >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'create when branch name has /' '
+	test_when_finished "git checkout main" &&
+	git checkout -b some/topic &&
+	>foo &&
+	git add foo &&
+	STASH_ID=$(git stash create "create test message") &&
+	echo "On some/topic: create test message" >expect &&
 	git show --pretty=%s -s ${STASH_ID} >actual &&
 	test_cmp expect actual
 '
@@ -1013,13 +1139,13 @@ test_expect_success 'create with multiple arguments for the message' '
 	>foo &&
 	git add foo &&
 	STASH_ID=$(git stash create test untracked) &&
-	echo "On master: test untracked" >expect &&
+	echo "On main: test untracked" >expect &&
 	git show --pretty=%s -s ${STASH_ID} >actual &&
 	test_cmp expect actual
 '
 
 test_expect_success 'create in a detached state' '
-	test_when_finished "git checkout master" &&
+	test_when_finished "git checkout main" &&
 	git checkout HEAD~1 &&
 	>foo &&
 	git add foo &&
@@ -1089,19 +1215,19 @@ test_expect_success 'stash with file including $IFS character' '
 '
 
 test_expect_success 'stash with pathspec matching multiple paths' '
-       echo original >file &&
-       echo original >other-file &&
-       git commit -m "two" file other-file &&
-       echo modified >file &&
-       echo modified >other-file &&
-       git stash push -- "*file" &&
-       echo original >expect &&
-       test_cmp expect file &&
-       test_cmp expect other-file &&
-       git stash pop &&
-       echo modified >expect &&
-       test_cmp expect file &&
-       test_cmp expect other-file
+	echo original >file &&
+	echo original >other-file &&
+	git commit -m "two" file other-file &&
+	echo modified >file &&
+	echo modified >other-file &&
+	git stash push -- "*file" &&
+	echo original >expect &&
+	test_cmp expect file &&
+	test_cmp expect other-file &&
+	git stash pop &&
+	echo modified >expect &&
+	test_cmp expect file &&
+	test_cmp expect other-file
 '
 
 test_expect_success 'stash push -p with pathspec shows no changes only once' '
@@ -1111,7 +1237,7 @@ test_expect_success 'stash push -p with pathspec shows no changes only once' '
 	git stash push -p foo >actual &&
 	echo "No local changes to save" >expect &&
 	git reset --hard HEAD~ &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 test_expect_success 'push <pathspec>: show no changes when there are none' '
@@ -1121,7 +1247,7 @@ test_expect_success 'push <pathspec>: show no changes when there are none' '
 	git stash push foo >actual &&
 	echo "No local changes to save" >expect &&
 	git reset --hard HEAD~ &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 test_expect_success 'push: <pathspec> not in the repository errors out' '
@@ -1239,7 +1365,6 @@ test_expect_success 'stash works when user.name and user.email are not set' '
 	>2 &&
 	git add 2 &&
 	test_config user.useconfigonly true &&
-	test_config stash.usebuiltin true &&
 	(
 		sane_unset GIT_AUTHOR_NAME &&
 		sane_unset GIT_AUTHOR_EMAIL &&
@@ -1290,18 +1415,157 @@ test_expect_success 'stash handles skip-worktree entries nicely' '
 	git rev-parse --verify refs/stash:A.t
 '
 
-test_expect_success 'stash -c stash.useBuiltin=false warning ' '
-	expected="stash.useBuiltin support has been removed" &&
 
-	git -c stash.useBuiltin=false stash 2>err &&
-	test_i18ngrep "$expected" err &&
-	env GIT_TEST_STASH_USE_BUILTIN=false git stash 2>err &&
-	test_i18ngrep "$expected" err &&
+BATCH_CONFIGURATION='-c core.fsync=loose-object -c core.fsyncmethod=batch'
+
+test_expect_success 'stash with core.fsyncmethod=batch' "
+	test_create_unique_files 2 4 files_base_dir &&
+	GIT_TEST_FSYNC=1 git $BATCH_CONFIGURATION stash push -u -- ./files_base_dir/ &&
+
+	# The files were untracked, so use the third parent,
+	# which contains the untracked files
+	git ls-tree -r stash^3 -- ./files_base_dir/ |
+	test_parse_ls_tree_oids >stashed_files_oids &&
 
-	git -c stash.useBuiltin=true stash 2>err &&
-	test_must_be_empty err &&
-	env GIT_TEST_STASH_USE_BUILTIN=true git stash 2>err &&
-	test_must_be_empty err
+	# We created 2 dirs with 4 files each (8 files total) above
+	test_line_count = 8 stashed_files_oids &&
+	git cat-file --batch-check='%(objectname)' <stashed_files_oids >stashed_files_actual &&
+	test_cmp stashed_files_oids stashed_files_actual
+"
+
+
+test_expect_success 'git stash succeeds despite directory/file change' '
+	test_create_repo directory_file_switch_v1 &&
+	(
+		cd directory_file_switch_v1 &&
+		test_commit init &&
+
+		test_write_lines this file has some words >filler &&
+		git add filler &&
+		git commit -m filler &&
+
+		git rm filler &&
+		mkdir filler &&
+		echo contents >filler/file &&
+		git stash push
+	)
+'
+
+test_expect_success 'git stash can pop file -> directory saved changes' '
+	test_create_repo directory_file_switch_v2 &&
+	(
+		cd directory_file_switch_v2 &&
+		test_commit init &&
+
+		test_write_lines this file has some words >filler &&
+		git add filler &&
+		git commit -m filler &&
+
+		git rm filler &&
+		mkdir filler &&
+		echo contents >filler/file &&
+		cp filler/file expect &&
+		git stash push --include-untracked &&
+		git stash apply --index &&
+		test_cmp expect filler/file
+	)
+'
+
+test_expect_success 'git stash can pop directory -> file saved changes' '
+	test_create_repo directory_file_switch_v3 &&
+	(
+		cd directory_file_switch_v3 &&
+		test_commit init &&
+
+		mkdir filler &&
+		test_write_lines some words >filler/file1 &&
+		test_write_lines and stuff >filler/file2 &&
+		git add filler &&
+		git commit -m filler &&
+
+		git rm -rf filler &&
+		echo contents >filler &&
+		cp filler expect &&
+		git stash push --include-untracked &&
+		git stash apply --index &&
+		test_cmp expect filler
+	)
+'
+
+test_expect_success 'restore untracked files even when we hit conflicts' '
+	git init restore_untracked_after_conflict &&
+	(
+		cd restore_untracked_after_conflict &&
+
+		echo hi >a &&
+		echo there >b &&
+		git add . &&
+		git commit -m first &&
+		echo hello >a &&
+		echo something >c &&
+
+		git stash push --include-untracked &&
+
+		echo conflict >a &&
+		git add a &&
+		git commit -m second &&
+
+		test_must_fail git stash pop &&
+
+		test_path_is_file c
+	)
+'
+
+test_expect_success 'stash create reports a locked index' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	(
+		cd repo &&
+		test_commit A A.file &&
+		echo change >A.file &&
+		touch .git/index.lock &&
+
+		cat >expect <<-EOF &&
+		error: could not write index
+		EOF
+		test_must_fail git stash create 2>err &&
+		test_cmp expect err
+	)
+'
+
+test_expect_success 'stash push reports a locked index' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	(
+		cd repo &&
+		test_commit A A.file &&
+		echo change >A.file &&
+		touch .git/index.lock &&
+
+		cat >expect <<-EOF &&
+		error: could not write index
+		EOF
+		test_must_fail git stash push 2>err &&
+		test_cmp expect err
+	)
+'
+
+test_expect_success 'stash apply reports a locked index' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	(
+		cd repo &&
+		test_commit A A.file &&
+		echo change >A.file &&
+		git stash push &&
+		touch .git/index.lock &&
+
+		cat >expect <<-EOF &&
+		error: could not write index
+		EOF
+		test_must_fail git stash apply 2>err &&
+		test_cmp expect err
+	)
 '
 
 test_done
diff --git a/t/t3904-stash-patch.sh b/t/t3904-stash-patch.sh
index accfe38..368fc2a 100755
--- a/t/t3904-stash-patch.sh
+++ b/t/t3904-stash-patch.sh
@@ -3,12 +3,6 @@
 test_description='stash -p'
 . ./lib-patch-mode.sh
 
-if ! test_have_prereq PERL
-then
-	skip_all='skipping stash -p tests, perl not available'
-	test_done
-fi
-
 test_expect_success 'setup' '
 	mkdir dir &&
 	echo parent > dir/foo &&
diff --git a/t/t3905-stash-include-untracked.sh b/t/t3905-stash-include-untracked.sh
index f075c7f..1289ae3 100755
--- a/t/t3905-stash-include-untracked.sh
+++ b/t/t3905-stash-include-untracked.sh
@@ -8,16 +8,16 @@ test_description='Test git stash --include-untracked'
 . ./test-lib.sh
 
 test_expect_success 'stash save --include-untracked some dirty working directory' '
-	echo 1 > file &&
+	echo 1 >file &&
 	git add file &&
 	test_tick &&
 	git commit -m initial &&
-	echo 2 > file &&
+	echo 2 >file &&
 	git add file &&
-	echo 3 > file &&
+	echo 3 >file &&
 	test_tick &&
-	echo 1 > file2 &&
-	echo 1 > HEAD &&
+	echo 1 >file2 &&
+	echo 1 >HEAD &&
 	mkdir untracked &&
 	echo untracked >untracked/untracked &&
 	git stash --include-untracked &&
@@ -25,48 +25,50 @@ test_expect_success 'stash save --include-untracked some dirty working directory
 	git diff-index --cached --quiet HEAD
 '
 
-cat > expect <<EOF
-?? actual
-?? expect
-EOF
-
 test_expect_success 'stash save --include-untracked cleaned the untracked files' '
+	cat >expect <<-EOF &&
+	?? actual
+	?? expect
+	EOF
+
 	git status --porcelain >actual &&
 	test_cmp expect actual
 '
 
-tracked=$(git rev-parse --short $(echo 1 | git hash-object --stdin))
-untracked=$(git rev-parse --short $(echo untracked | git hash-object --stdin))
-cat > expect.diff <<EOF
-diff --git a/HEAD b/HEAD
-new file mode 100644
-index 0000000..$tracked
---- /dev/null
-+++ b/HEAD
-@@ -0,0 +1 @@
-+1
-diff --git a/file2 b/file2
-new file mode 100644
-index 0000000..$tracked
---- /dev/null
-+++ b/file2
-@@ -0,0 +1 @@
-+1
-diff --git a/untracked/untracked b/untracked/untracked
-new file mode 100644
-index 0000000..$untracked
---- /dev/null
-+++ b/untracked/untracked
-@@ -0,0 +1 @@
-+untracked
-EOF
-cat > expect.lstree <<EOF
-HEAD
-file2
-untracked
-EOF
-
 test_expect_success 'stash save --include-untracked stashed the untracked files' '
+	one_blob=$(echo 1 | git hash-object --stdin) &&
+	tracked=$(git rev-parse --short "$one_blob") &&
+	untracked_blob=$(echo untracked | git hash-object --stdin) &&
+	untracked=$(git rev-parse --short "$untracked_blob") &&
+	cat >expect.diff <<-EOF &&
+	diff --git a/HEAD b/HEAD
+	new file mode 100644
+	index 0000000..$tracked
+	--- /dev/null
+	+++ b/HEAD
+	@@ -0,0 +1 @@
+	+1
+	diff --git a/file2 b/file2
+	new file mode 100644
+	index 0000000..$tracked
+	--- /dev/null
+	+++ b/file2
+	@@ -0,0 +1 @@
+	+1
+	diff --git a/untracked/untracked b/untracked/untracked
+	new file mode 100644
+	index 0000000..$untracked
+	--- /dev/null
+	+++ b/untracked/untracked
+	@@ -0,0 +1 @@
+	+untracked
+	EOF
+	cat >expect.lstree <<-EOF &&
+	HEAD
+	file2
+	untracked
+	EOF
+
 	test_path_is_missing file2 &&
 	test_path_is_missing untracked &&
 	test_path_is_missing HEAD &&
@@ -83,57 +85,64 @@ test_expect_success 'stash save --patch --all fails' '
 	test_must_fail git stash --patch --all
 '
 
-git clean --force --quiet
+test_expect_success 'clean up untracked/untracked file to prepare for next tests' '
+	git clean --force --quiet
 
-cat > expect <<EOF
- M file
-?? HEAD
-?? actual
-?? expect
-?? file2
-?? untracked/
-EOF
+'
 
 test_expect_success 'stash pop after save --include-untracked leaves files untracked again' '
+	cat >expect <<-EOF &&
+	 M file
+	?? HEAD
+	?? actual
+	?? expect
+	?? file2
+	?? untracked/
+	EOF
+
 	git stash pop &&
 	git status --porcelain >actual &&
 	test_cmp expect actual &&
-	test "1" = "$(cat file2)" &&
-	test untracked = "$(cat untracked/untracked)"
+	echo 1 >expect_file2 &&
+	test_cmp expect_file2 file2 &&
+	echo untracked >untracked_expect &&
+	test_cmp untracked_expect untracked/untracked
 '
 
-git clean --force --quiet -d
+test_expect_success 'clean up untracked/ directory to prepare for next tests' '
+	git clean --force --quiet -d
+'
 
 test_expect_success 'stash save -u dirty index' '
-	echo 4 > file3 &&
+	echo 4 >file3 &&
 	git add file3 &&
 	test_tick &&
 	git stash -u
 '
 
-blob=$(git rev-parse --short $(echo 4 | git hash-object --stdin))
-cat > expect <<EOF
-diff --git a/file3 b/file3
-new file mode 100644
-index 0000000..$blob
---- /dev/null
-+++ b/file3
-@@ -0,0 +1 @@
-+4
-EOF
-
 test_expect_success 'stash save --include-untracked dirty index got stashed' '
+	four_blob=$(echo 4 | git hash-object --stdin) &&
+	blob=$(git rev-parse --short "$four_blob") &&
+	cat >expect <<-EOF &&
+	diff --git a/file3 b/file3
+	new file mode 100644
+	index 0000000..$blob
+	--- /dev/null
+	+++ b/file3
+	@@ -0,0 +1 @@
+	+4
+	EOF
+
 	git stash pop --index &&
+	test_when_finished "git reset" &&
 	git diff --cached >actual &&
 	test_cmp expect actual
 '
 
-git reset > /dev/null
-
 # Must direct output somewhere where it won't be considered an untracked file
 test_expect_success 'stash save --include-untracked -q is quiet' '
-	echo 1 > file5 &&
-	git stash save --include-untracked --quiet > .git/stash-output.out 2>&1 &&
+	echo 1 >file5 &&
+	git stash save --include-untracked --quiet >.git/stash-output.out 2>&1 &&
 	test_line_count = 0 .git/stash-output.out &&
 	rm -f .git/stash-output.out
 '
@@ -141,35 +150,34 @@ test_expect_success 'stash save --include-untracked -q is quiet' '
 test_expect_success 'stash save --include-untracked removed files' '
 	rm -f file &&
 	git stash save --include-untracked &&
-	echo 1 > expect &&
+	echo 1 >expect &&
+	test_when_finished "rm -f expect" &&
 	test_cmp expect file
 '
 
-rm -f expect
-
 test_expect_success 'stash save --include-untracked removed files got stashed' '
 	git stash pop &&
 	test_path_is_missing file
 '
 
-cat > .gitignore <<EOF
-.gitignore
-ignored
-ignored.d/
-EOF
-
 test_expect_success 'stash save --include-untracked respects .gitignore' '
-	echo ignored > ignored &&
+	cat >.gitignore <<-EOF &&
+	.gitignore
+	ignored
+	ignored.d/
+	EOF
+
+	echo ignored >ignored &&
 	mkdir ignored.d &&
 	echo ignored >ignored.d/untracked &&
 	git stash -u &&
-	test -s ignored &&
-	test -s ignored.d/untracked &&
-	test -s .gitignore
+	test_file_not_empty ignored &&
+	test_file_not_empty ignored.d/untracked &&
+	test_file_not_empty .gitignore
 '
 
 test_expect_success 'stash save -u can stash with only untracked files different' '
-	echo 4 > file4 &&
+	echo 4 >file4 &&
 	git stash -u &&
 	test_path_is_missing file4
 '
@@ -183,9 +191,9 @@ test_expect_success 'stash save --all does not respect .gitignore' '
 
 test_expect_success 'stash save --all is stash poppable' '
 	git stash pop &&
-	test -s ignored &&
-	test -s ignored.d/untracked &&
-	test -s .gitignore
+	test_file_not_empty ignored &&
+	test_file_not_empty ignored.d/untracked &&
+	test_file_not_empty .gitignore
 '
 
 test_expect_success 'stash push --include-untracked with pathspec' '
@@ -214,17 +222,17 @@ test_expect_success 'stash push with $IFS character' '
 	test_path_is_file bar
 '
 
-cat > .gitignore <<EOF
-ignored
-ignored.d/*
-EOF
-
 test_expect_success 'stash previously ignored file' '
+	cat >.gitignore <<-EOF &&
+	ignored
+	ignored.d/*
+	EOF
+
 	git reset HEAD &&
 	git add .gitignore &&
 	git commit -m "Add .gitignore" &&
 	>ignored.d/foo &&
-	echo "!ignored.d/foo" >> .gitignore &&
+	echo "!ignored.d/foo" >>.gitignore &&
 	git stash save --include-untracked &&
 	test_path_is_missing ignored.d/foo &&
 	git stash pop &&
@@ -280,7 +288,7 @@ test_expect_success 'stash -u -- <ignored> leaves ignored file alone' '
 test_expect_success 'stash -u -- <non-existent> shows no changes when there are none' '
 	git stash push -u -- non-existent >actual &&
 	echo "No local changes to save" >expect &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 test_expect_success 'stash -u with globs' '
@@ -289,4 +297,135 @@ test_expect_success 'stash -u with globs' '
 	test_path_is_missing untracked.txt
 '
 
+test_expect_success 'stash show --include-untracked shows untracked files' '
+	git reset --hard &&
+	git clean -xf &&
+	>untracked &&
+	>tracked &&
+	git add tracked &&
+	empty_blob_oid=$(git rev-parse --short :tracked) &&
+	git stash -u &&
+
+	cat >expect <<-EOF &&
+	 tracked   | 0
+	 untracked | 0
+	 2 files changed, 0 insertions(+), 0 deletions(-)
+	EOF
+	git stash show --include-untracked >actual &&
+	test_cmp expect actual &&
+	git stash show -u >actual &&
+	test_cmp expect actual &&
+	git stash show --no-include-untracked --include-untracked >actual &&
+	test_cmp expect actual &&
+	git stash show --only-untracked --include-untracked >actual &&
+	test_cmp expect actual &&
+	git -c stash.showIncludeUntracked=true stash show >actual &&
+	test_cmp expect actual &&
+
+	cat >expect <<-EOF &&
+	diff --git a/tracked b/tracked
+	new file mode 100644
+	index 0000000..$empty_blob_oid
+	diff --git a/untracked b/untracked
+	new file mode 100644
+	index 0000000..$empty_blob_oid
+	EOF
+	git stash show -p --include-untracked >actual &&
+	test_cmp expect actual &&
+	git stash show --include-untracked -p >actual &&
+	test_cmp expect actual &&
+	git -c stash.showIncludeUntracked=true stash show -p >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'stash show --only-untracked only shows untracked files' '
+	git reset --hard &&
+	git clean -xf &&
+	>untracked &&
+	>tracked &&
+	git add tracked &&
+	empty_blob_oid=$(git rev-parse --short :tracked) &&
+	git stash -u &&
+
+	cat >expect <<-EOF &&
+	 untracked | 0
+	 1 file changed, 0 insertions(+), 0 deletions(-)
+	EOF
+	git stash show --only-untracked >actual &&
+	test_cmp expect actual &&
+	git stash show --no-include-untracked --only-untracked >actual &&
+	test_cmp expect actual &&
+	git stash show --include-untracked --only-untracked >actual &&
+	test_cmp expect actual &&
+
+	cat >expect <<-EOF &&
+	diff --git a/untracked b/untracked
+	new file mode 100644
+	index 0000000..$empty_blob_oid
+	EOF
+	git stash show -p --only-untracked >actual &&
+	test_cmp expect actual &&
+	git stash show --only-untracked -p >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'stash show --no-include-untracked cancels --{include,only}-untracked' '
+	git reset --hard &&
+	git clean -xf &&
+	>untracked &&
+	>tracked &&
+	git add tracked &&
+	git stash -u &&
+
+	cat >expect <<-EOF &&
+	 tracked | 0
+	 1 file changed, 0 insertions(+), 0 deletions(-)
+	EOF
+	git stash show --only-untracked --no-include-untracked >actual &&
+	test_cmp expect actual &&
+	git stash show --include-untracked --no-include-untracked >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'stash show --include-untracked errors on duplicate files' '
+	git reset --hard &&
+	git clean -xf &&
+	>tracked &&
+	git add tracked &&
+	tree=$(git write-tree) &&
+	i_commit=$(git commit-tree -p HEAD -m "index on any-branch" "$tree") &&
+	test_when_finished "rm -f untracked_index" &&
+	u_commit=$(
+		GIT_INDEX_FILE="untracked_index" &&
+		export GIT_INDEX_FILE &&
+		git update-index --add tracked &&
+		u_tree=$(git write-tree) &&
+		git commit-tree -m "untracked files on any-branch" "$u_tree"
+	) &&
+	w_commit=$(git commit-tree -p HEAD -p "$i_commit" -p "$u_commit" -m "WIP on any-branch" "$tree") &&
+	test_must_fail git stash show --include-untracked "$w_commit" 2>err &&
+	test_grep "worktree and untracked commit have duplicate entries: tracked" err
+'
+
+test_expect_success 'stash show --{include,only}-untracked on stashes without untracked entries' '
+	git reset --hard &&
+	git clean -xf &&
+	>tracked &&
+	git add tracked &&
+	git stash &&
+
+	git stash show >expect &&
+	git stash show --include-untracked >actual &&
+	test_cmp expect actual &&
+
+	git stash show --only-untracked >actual &&
+	test_must_be_empty actual
+'
+
+test_expect_success 'stash -u ignores sub-repository' '
+	test_when_finished "rm -rf sub-repo" &&
+	git init sub-repo &&
+	git stash -u
+'
+
 test_done
diff --git a/t/t3906-stash-submodule.sh b/t/t3906-stash-submodule.sh
index a52e53d..0f7348e 100755
--- a/t/t3906-stash-submodule.sh
+++ b/t/t3906-stash-submodule.sh
@@ -36,7 +36,7 @@ setup_basic () {
 	git init main &&
 	(
 		cd main &&
-		git submodule add ../sub &&
+		git -c protocol.file.allow=always submodule add ../sub &&
 		test_commit main_file
 	)
 }
diff --git a/t/t3908-stash-in-worktree.sh b/t/t3908-stash-in-worktree.sh
index 2b2b366..347a89b 100755
--- a/t/t3908-stash-in-worktree.sh
+++ b/t/t3908-stash-in-worktree.sh
@@ -5,6 +5,7 @@
 
 test_description='Test git stash in a worktree'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
diff --git a/t/t3909-stash-pathspec-file.sh b/t/t3909-stash-pathspec-file.sh
index 55e050c..73f2dbd 100755
--- a/t/t3909-stash-pathspec-file.sh
+++ b/t/t3909-stash-pathspec-file.sh
@@ -88,13 +88,13 @@ test_expect_success 'error conditions' '
 	echo fileA.t >list &&
 
 	test_must_fail git stash push --pathspec-from-file=list --patch 2>err &&
-	test_i18ngrep -e "--pathspec-from-file is incompatible with --patch" err &&
+	test_grep -e "options .--pathspec-from-file. and .--patch. cannot be used together" err &&
 
 	test_must_fail git stash push --pathspec-from-file=list -- fileA.t 2>err &&
-	test_i18ngrep -e "--pathspec-from-file is incompatible with pathspec arguments" err &&
+	test_grep -e ".--pathspec-from-file. and pathspec arguments cannot be used together" err &&
 
 	test_must_fail git stash push --pathspec-file-nul 2>err &&
-	test_i18ngrep -e "--pathspec-file-nul requires --pathspec-from-file" err
+	test_grep -e "the option .--pathspec-file-nul. requires .--pathspec-from-file." err
 '
 
 test_done
diff --git a/t/t3910-mac-os-precompose.sh b/t/t3910-mac-os-precompose.sh
index 54ce19e..898267a 100755
--- a/t/t3910-mac-os-precompose.sh
+++ b/t/t3910-mac-os-precompose.sh
@@ -5,6 +5,9 @@
 
 test_description='utf-8 decomposed (nfd) converted to precomposed (nfc)'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 if ! test_have_prereq UTF8_NFD_TO_NFC
@@ -151,7 +154,7 @@ test_expect_success "git checkout link nfd" '
 	git checkout l.$Odiarnfd
 '
 test_expect_success "setup case mac2" '
-	git checkout master &&
+	git checkout main &&
 	git reset --hard &&
 	git checkout -b mac_os_2
 '
@@ -163,7 +166,7 @@ test_expect_success "commit file d2.Adiarnfd/f.Adiarnfd" '
 	git commit -m "add d2.$Adiarnfd/f.$Adiarnfd" -- d2.$Adiarnfd/f.$Adiarnfd
 '
 test_expect_success "setup for long decomposed filename" '
-	git checkout master &&
+	git checkout main &&
 	git reset --hard &&
 	git checkout -b mac_os_long_nfd_fn
 '
@@ -173,7 +176,7 @@ test_expect_success "Add long decomposed filename" '
 	git commit -m "Long filename"
 '
 test_expect_success "setup for long precomposed filename" '
-	git checkout master &&
+	git checkout main &&
 	git reset --hard &&
 	git checkout -b mac_os_long_nfc_fn
 '
@@ -191,6 +194,22 @@ test_expect_failure 'handle existing decomposed filenames' '
 	test_must_be_empty untracked
 '
 
+test_expect_success "unicode decomposed: git restore -p . " '
+	DIRNAMEPWD=dir.Odiarnfc &&
+	DIRNAMEINREPO=dir.$Adiarnfc &&
+	export DIRNAMEPWD DIRNAMEINREPO &&
+	git init "$DIRNAMEPWD" &&
+	(
+		cd "$DIRNAMEPWD" &&
+		mkdir "$DIRNAMEINREPO" &&
+		cd "$DIRNAMEINREPO" &&
+		echo "Initial" >file &&
+		git add file &&
+		echo "More stuff" >>file &&
+		echo y | git restore -p .
+	)
+'
+
 # Test if the global core.precomposeunicode stops autosensing
 # Must be the last test case
 test_expect_success "respect git config --global core.precomposeunicode" '
diff --git a/t/t3920-crlf-messages.sh b/t/t3920-crlf-messages.sh
new file mode 100755
index 0000000..50ae222
--- /dev/null
+++ b/t/t3920-crlf-messages.sh
@@ -0,0 +1,128 @@
+#!/bin/sh
+
+test_description='Test ref-filter and pretty APIs for commit and tag messages using CRLF'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+LIB_CRLF_BRANCHES=""
+
+create_crlf_ref () {
+	branch="$1" &&
+	cat >.crlf-orig-$branch.txt &&
+	append_cr <.crlf-orig-$branch.txt >.crlf-message-$branch.txt &&
+	grep 'Subject' .crlf-orig-$branch.txt | tr '\n' ' ' | sed 's/[ ]*$//' | tr -d '\n' >.crlf-subject-$branch.txt &&
+	grep 'Body' .crlf-orig-$branch.txt | append_cr >.crlf-body-$branch.txt &&
+	LIB_CRLF_BRANCHES="${LIB_CRLF_BRANCHES} ${branch}" &&
+	test_tick &&
+	hash=$(git commit-tree HEAD^{tree} -p HEAD -F .crlf-message-${branch}.txt) &&
+	git branch ${branch} ${hash} &&
+	git tag tag-${branch} ${branch} -F .crlf-message-${branch}.txt --cleanup=verbatim
+}
+
+create_crlf_refs () {
+	create_crlf_ref crlf <<-\EOF &&
+	Subject first line
+
+	Body first line
+	Body second line
+	EOF
+	create_crlf_ref crlf-empty-lines-after-subject <<-\EOF &&
+	Subject first line
+
+
+	Body first line
+	Body second line
+	EOF
+	create_crlf_ref crlf-two-line-subject <<-\EOF &&
+	Subject first line
+	Subject second line
+
+	Body first line
+	Body second line
+	EOF
+	create_crlf_ref crlf-two-line-subject-no-body <<-\EOF &&
+	Subject first line
+	Subject second line
+	EOF
+	create_crlf_ref crlf-two-line-subject-no-body-trailing-newline <<-\EOF
+	Subject first line
+	Subject second line
+
+	EOF
+}
+
+test_crlf_subject_body_and_contents() {
+	command_and_args="$@" &&
+	command=$1 &&
+	if test ${command} = "branch" || test ${command} = "for-each-ref" || test ${command} = "tag"
+	then
+		atoms="(contents:subject) (contents:body) (contents)"
+	elif test ${command} = "log" || test ${command} = "show"
+	then
+		atoms="s b B"
+	fi &&
+	files="subject body message" &&
+	while test -n "${atoms}"
+	do
+		set ${atoms} && atom=$1 && shift && atoms="$*" &&
+		set ${files} && file=$1 && shift && files="$*" &&
+		test_expect_success "${command}: --format='%${atom}' works with messages using CRLF" "
+			rm -f expect &&
+			for ref in ${LIB_CRLF_BRANCHES}
+			do
+				cat .crlf-${file}-\"\${ref}\".txt >>expect &&
+				printf \"\n\" >>expect || return 1
+			done &&
+			git $command_and_args --format=\"%${atom}\" >actual &&
+			test_cmp expect actual
+		"
+	done
+}
+
+
+test_expect_success 'Setup refs with commit and tag messages using CRLF' '
+	test_commit inital &&
+	create_crlf_refs
+'
+
+test_expect_success 'branch: --verbose works with messages using CRLF' '
+	rm -f expect &&
+	for branch in $LIB_CRLF_BRANCHES
+	do
+		printf "  " >>expect &&
+		cat .crlf-subject-${branch}.txt >>expect &&
+		printf "\n" >>expect || return 1
+	done &&
+	git branch -v >tmp &&
+	# Remove first two columns, and the line for the currently checked out branch
+	current=$(git branch --show-current) &&
+	awk "/$current/ { next } { \$1 = \$2 = \"\" } 1" <tmp >actual &&
+	test_cmp expect actual
+'
+
+test_crlf_subject_body_and_contents branch --list crlf*
+
+test_crlf_subject_body_and_contents tag --list tag-crlf*
+
+test_crlf_subject_body_and_contents for-each-ref refs/heads/crlf*
+
+test_expect_success 'log: --oneline works with messages using CRLF' '
+	for branch in $LIB_CRLF_BRANCHES
+	do
+		cat .crlf-subject-${branch}.txt >expect &&
+		printf "\n" >>expect &&
+		git log --oneline -1 ${branch} >tmp-branch &&
+		git log --oneline -1 tag-${branch} >tmp-tag &&
+		cut -d" " -f2- <tmp-branch >actual-branch &&
+		cut -d" " -f2- <tmp-tag >actual-tag &&
+		test_cmp expect actual-branch &&
+		test_cmp expect actual-tag || return 1
+	done
+'
+
+test_crlf_subject_body_and_contents log --all --reverse --grep Subject
+
+test_crlf_subject_body_and_contents show $LIB_CRLF_BRANCHES
+
+test_done
diff --git a/t/t4000-diff-format.sh b/t/t4000-diff-format.sh
index e5116a7..8d50331 100755
--- a/t/t4000-diff-format.sh
+++ b/t/t4000-diff-format.sh
@@ -5,18 +5,25 @@
 
 test_description='Test built-in diff output engine.
 
+We happen to know that all diff plumbing and diff Porcelain share the
+same command line parser, so testing one should be sufficient; pick
+diff-files as a representative.
 '
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
-. "$TEST_DIRECTORY"/diff-lib.sh
+. "$TEST_DIRECTORY"/lib-diff.sh
 
 echo >path0 'Line 1
 Line 2
 line 3'
 cat path0 >path1
 chmod +x path1
+mkdir path2
+>path2/path3
 
 test_expect_success 'update-index --add two files with and without +x.' '
-	git update-index --add path0 path1
+	git update-index --add path0 path1 path2/path3
 '
 
 mv path0 path0-
@@ -89,4 +96,31 @@ test_expect_success 'git diff-files --patch --no-patch does not show the patch'
 	test_must_be_empty err
 '
 
+
+# Smudge path2/path3 so that dirstat has something to show
+date >path2/path3
+
+for format in stat raw numstat shortstat summary \
+	dirstat cumulative dirstat-by-file \
+	patch-with-raw patch-with-stat compact-summary
+do
+	test_expect_success "--no-patch in 'git diff-files --no-patch --$format' is a no-op" '
+		git diff-files --no-patch "--$format" >actual &&
+		git diff-files "--$format" >expect &&
+		test_cmp expect actual
+	'
+
+	test_expect_success "--no-patch clears all previous ones" '
+		git diff-files --$format -s -p >actual &&
+		git diff-files -p >expect &&
+		test_cmp expect actual
+	'
+
+	test_expect_success "--no-patch in 'git diff --no-patch --$format' is a no-op" '
+		git diff --no-patch "--$format" >actual &&
+		git diff "--$format" >expect &&
+		test_cmp expect actual
+	'
+done
+
 test_done
diff --git a/t/t4001-diff-rename.sh b/t/t4001-diff-rename.sh
index c16486a..49c042a 100755
--- a/t/t4001-diff-rename.sh
+++ b/t/t4001-diff-rename.sh
@@ -7,7 +7,7 @@ test_description='Test rename detection in diff engine.
 
 '
 . ./test-lib.sh
-. "$TEST_DIRECTORY"/diff-lib.sh
+. "$TEST_DIRECTORY"/lib-diff.sh
 
 test_expect_success 'setup' '
 	cat >path0 <<-\EOF &&
@@ -135,25 +135,25 @@ test_expect_success 'favour same basenames over different ones' '
 	mkdir subdir &&
 	git mv another-path subdir/path1 &&
 	git status >out &&
-	test_i18ngrep "renamed: .*path1 -> subdir/path1" out
+	test_grep "renamed: .*path1 -> subdir/path1" out
 '
 
 test_expect_success 'test diff.renames=true for git status' '
 	git -c diff.renames=true status >out &&
-	test_i18ngrep "renamed: .*path1 -> subdir/path1" out
+	test_grep "renamed: .*path1 -> subdir/path1" out
 '
 
 test_expect_success 'test diff.renames=false for git status' '
 	git -c diff.renames=false status >out &&
-	test_i18ngrep ! "renamed: .*path1 -> subdir/path1" out &&
-	test_i18ngrep "new file: .*subdir/path1" out &&
-	test_i18ngrep "deleted: .*[^/]path1" out
+	test_grep ! "renamed: .*path1 -> subdir/path1" out &&
+	test_grep "new file: .*subdir/path1" out &&
+	test_grep "deleted: .*[^/]path1" out
 '
 
 test_expect_success 'favour same basenames even with minor differences' '
 	git show HEAD:path1 | sed "s/15/16/" > subdir/path1 &&
 	git status >out &&
-	test_i18ngrep "renamed: .*path1 -> subdir/path1" out
+	test_grep "renamed: .*path1 -> subdir/path1" out
 '
 
 test_expect_success 'two files with same basename and same content' '
@@ -165,7 +165,7 @@ test_expect_success 'two files with same basename and same content' '
 	git commit -m 2 &&
 	git mv dir other-dir &&
 	git status >out &&
-	test_i18ngrep "renamed: .*dir/A/file -> other-dir/A/file" out
+	test_grep "renamed: .*dir/A/file -> other-dir/A/file" out
 '
 
 test_expect_success 'setup for many rename source candidates' '
@@ -174,7 +174,7 @@ test_expect_success 'setup for many rename source candidates' '
 	do
 		for j in 0 1 2 3 4 5 6 7 8 9;
 		do
-			echo "$i$j" >"path$i$j"
+			echo "$i$j" >"path$i$j" || return 1
 		done
 	done &&
 	git add "path??" &&
@@ -202,9 +202,9 @@ test_expect_success 'rename pretty print with nothing in common' '
 	git mv a/b/c c/b/a &&
 	git commit -m "a/b/c -> c/b/a" &&
 	git diff -M --summary HEAD^ HEAD >output &&
-	test_i18ngrep " a/b/c => c/b/a " output &&
+	test_grep " a/b/c => c/b/a " output &&
 	git diff -M --stat HEAD^ HEAD >output &&
-	test_i18ngrep " a/b/c => c/b/a " output
+	test_grep " a/b/c => c/b/a " output
 '
 
 test_expect_success 'rename pretty print with common prefix' '
@@ -212,9 +212,9 @@ test_expect_success 'rename pretty print with common prefix' '
 	git mv c/b/a c/d/e &&
 	git commit -m "c/b/a -> c/d/e" &&
 	git diff -M --summary HEAD^ HEAD >output &&
-	test_i18ngrep " c/{b/a => d/e} " output &&
+	test_grep " c/{b/a => d/e} " output &&
 	git diff -M --stat HEAD^ HEAD >output &&
-	test_i18ngrep " c/{b/a => d/e} " output
+	test_grep " c/{b/a => d/e} " output
 '
 
 test_expect_success 'rename pretty print with common suffix' '
@@ -222,9 +222,9 @@ test_expect_success 'rename pretty print with common suffix' '
 	git mv c/d/e d/e &&
 	git commit -m "c/d/e -> d/e" &&
 	git diff -M --summary HEAD^ HEAD >output &&
-	test_i18ngrep " {c/d => d}/e " output &&
+	test_grep " {c/d => d}/e " output &&
 	git diff -M --stat HEAD^ HEAD >output &&
-	test_i18ngrep " {c/d => d}/e " output
+	test_grep " {c/d => d}/e " output
 '
 
 test_expect_success 'rename pretty print with common prefix and suffix' '
@@ -232,9 +232,9 @@ test_expect_success 'rename pretty print with common prefix and suffix' '
 	git mv d/e d/f/e &&
 	git commit -m "d/e -> d/f/e" &&
 	git diff -M --summary HEAD^ HEAD >output &&
-	test_i18ngrep " d/{ => f}/e " output &&
+	test_grep " d/{ => f}/e " output &&
 	git diff -M --stat HEAD^ HEAD >output &&
-	test_i18ngrep " d/{ => f}/e " output
+	test_grep " d/{ => f}/e " output
 '
 
 test_expect_success 'rename pretty print common prefix and suffix overlap' '
@@ -242,9 +242,9 @@ test_expect_success 'rename pretty print common prefix and suffix overlap' '
 	git mv d/f/e d/f/f/e &&
 	git commit -m "d/f/e d/f/f/e" &&
 	git diff -M --summary HEAD^ HEAD >output &&
-	test_i18ngrep " d/f/{ => f}/e " output &&
+	test_grep " d/f/{ => f}/e " output &&
 	git diff -M --stat HEAD^ HEAD >output &&
-	test_i18ngrep " d/f/{ => f}/e " output
+	test_grep " d/f/{ => f}/e " output
 '
 
 test_expect_success 'diff-tree -l0 defaults to a big rename limit, not zero' '
@@ -262,4 +262,52 @@ test_expect_success 'diff-tree -l0 defaults to a big rename limit, not zero' '
 	grep "myotherfile.*myfile" actual
 '
 
+test_expect_success 'basename similarity vs best similarity' '
+	mkdir subdir &&
+	test_write_lines line1 line2 line3 line4 line5 \
+			 line6 line7 line8 line9 line10 >subdir/file.txt &&
+	git add subdir/file.txt &&
+	git commit -m "base txt" &&
+
+	git rm subdir/file.txt &&
+	test_write_lines line1 line2 line3 line4 line5 \
+			  line6 line7 line8 >file.txt &&
+	test_write_lines line1 line2 line3 line4 line5 \
+			  line6 line7 line8 line9 >file.md &&
+	git add file.txt file.md &&
+	git commit -a -m "rename" &&
+	git diff-tree -r -M --name-status HEAD^ HEAD >actual &&
+	# subdir/file.txt is 88% similar to file.md, 78% similar to file.txt,
+	# but since same basenames are checked first...
+	cat >expected <<-\EOF &&
+	A	file.md
+	R078	subdir/file.txt	file.txt
+	EOF
+	test_cmp expected actual
+'
+
+test_expect_success 'last line matters too' '
+	{
+		test_write_lines a 0 1 2 3 4 5 6 7 8 9 &&
+		printf "git ignores final up to 63 characters if not newline terminated"
+	} >no-final-lf &&
+	git add no-final-lf &&
+	git commit -m "original version of file with no final newline" &&
+
+	# Change ONLY the first character of the whole file
+	{
+		test_write_lines b 0 1 2 3 4 5 6 7 8 9 &&
+		printf "git ignores final up to 63 characters if not newline terminated"
+	} >no-final-lf &&
+	git add no-final-lf &&
+	git mv no-final-lf still-absent-final-lf &&
+	git commit -a -m "rename no-final-lf -> still-absent-final-lf" &&
+	git diff-tree -r -M --name-status HEAD^ HEAD >actual &&
+	sed -e "s/^R[0-9]*	/R	/" actual >actual.munged &&
+	cat >expected <<-\EOF &&
+	R	no-final-lf	still-absent-final-lf
+	EOF
+	test_cmp expected actual.munged
+'
+
 test_done
diff --git a/t/t4002-diff-basic.sh b/t/t4002-diff-basic.sh
index 6a9f010..cb33070 100755
--- a/t/t4002-diff-basic.sh
+++ b/t/t4002-diff-basic.sh
@@ -6,6 +6,8 @@
 test_description='Test diff raw-output.
 
 '
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 . "$TEST_DIRECTORY"/lib-read-tree-m-3way.sh
@@ -282,132 +284,131 @@ cmp_diff_files_output () {
     test_cmp "$1" .test-tmp
 }
 
-test_expect_success \
-    'diff-tree of known trees.' \
-    'git diff-tree $tree_O $tree_A >.test-a &&
-     cmp -s .test-a .test-plain-OA'
-
-test_expect_success \
-    'diff-tree of known trees.' \
-    'git diff-tree -r $tree_O $tree_A >.test-a &&
-     cmp -s .test-a .test-recursive-OA'
-
-test_expect_success \
-    'diff-tree of known trees.' \
-    'git diff-tree $tree_O $tree_B >.test-a &&
-     cmp -s .test-a .test-plain-OB'
-
-test_expect_success \
-    'diff-tree of known trees.' \
-    'git diff-tree -r $tree_O $tree_B >.test-a &&
-     cmp -s .test-a .test-recursive-OB'
-
-test_expect_success \
-    'diff-tree of known trees.' \
-    'git diff-tree $tree_A $tree_B >.test-a &&
-     cmp -s .test-a .test-plain-AB'
-
-test_expect_success \
-    'diff-tree of known trees.' \
-    'git diff-tree -r $tree_A $tree_B >.test-a &&
-     cmp -s .test-a .test-recursive-AB'
-
-test_expect_success \
-    'diff-tree --stdin of known trees.' \
-    'echo $tree_A $tree_B | git diff-tree --stdin > .test-a &&
-     echo $tree_A $tree_B > .test-plain-ABx &&
-     cat .test-plain-AB >> .test-plain-ABx &&
-     cmp -s .test-a .test-plain-ABx'
-
-test_expect_success \
-    'diff-tree --stdin of known trees.' \
-    'echo $tree_A $tree_B | git diff-tree -r --stdin > .test-a &&
-     echo $tree_A $tree_B > .test-recursive-ABx &&
-     cat .test-recursive-AB >> .test-recursive-ABx &&
-     cmp -s .test-a .test-recursive-ABx'
-
-test_expect_success \
-    'diff-cache O with A in cache' \
-    'git read-tree $tree_A &&
-     git diff-index --cached $tree_O >.test-a &&
-     cmp -s .test-a .test-recursive-OA'
-
-test_expect_success \
-    'diff-cache O with B in cache' \
-    'git read-tree $tree_B &&
-     git diff-index --cached $tree_O >.test-a &&
-     cmp -s .test-a .test-recursive-OB'
-
-test_expect_success \
-    'diff-cache A with B in cache' \
-    'git read-tree $tree_B &&
-     git diff-index --cached $tree_A >.test-a &&
-     cmp -s .test-a .test-recursive-AB'
-
-test_expect_success \
-    'diff-files with O in cache and A checked out' \
-    'rm -fr Z [A-Z][A-Z] &&
-     git read-tree $tree_A &&
-     git checkout-index -f -a &&
-     git read-tree --reset $tree_O &&
-     test_must_fail git update-index --refresh -q &&
-     git diff-files >.test-a &&
-     cmp_diff_files_output .test-a .test-recursive-OA'
-
-test_expect_success \
-    'diff-files with O in cache and B checked out' \
-    'rm -fr Z [A-Z][A-Z] &&
-     git read-tree $tree_B &&
-     git checkout-index -f -a &&
-     git read-tree --reset $tree_O &&
-     test_must_fail git update-index --refresh -q &&
-     git diff-files >.test-a &&
-     cmp_diff_files_output .test-a .test-recursive-OB'
-
-test_expect_success \
-    'diff-files with A in cache and B checked out' \
-    'rm -fr Z [A-Z][A-Z] &&
-     git read-tree $tree_B &&
-     git checkout-index -f -a &&
-     git read-tree --reset $tree_A &&
-     test_must_fail git update-index --refresh -q &&
-     git diff-files >.test-a &&
-     cmp_diff_files_output .test-a .test-recursive-AB'
+test_expect_success 'diff-tree of known trees.' '
+	git diff-tree $tree_O $tree_A >.test-a &&
+	cmp -s .test-a .test-plain-OA
+'
+
+test_expect_success 'diff-tree of known trees.' '
+	git diff-tree -r $tree_O $tree_A >.test-a &&
+	cmp -s .test-a .test-recursive-OA
+'
+
+test_expect_success 'diff-tree of known trees.' '
+	git diff-tree $tree_O $tree_B >.test-a &&
+	cmp -s .test-a .test-plain-OB
+'
+
+test_expect_success 'diff-tree of known trees.' '
+	git diff-tree -r $tree_O $tree_B >.test-a &&
+	cmp -s .test-a .test-recursive-OB
+'
+
+test_expect_success 'diff-tree of known trees.' '
+	git diff-tree $tree_A $tree_B >.test-a &&
+	cmp -s .test-a .test-plain-AB
+'
+
+test_expect_success 'diff-tree of known trees.' '
+	git diff-tree -r $tree_A $tree_B >.test-a &&
+	cmp -s .test-a .test-recursive-AB
+'
+
+test_expect_success 'diff-tree --stdin of known trees.' '
+	echo $tree_A $tree_B | git diff-tree --stdin > .test-a &&
+	echo $tree_A $tree_B > .test-plain-ABx &&
+	cat .test-plain-AB >> .test-plain-ABx &&
+	cmp -s .test-a .test-plain-ABx
+'
+
+test_expect_success 'diff-tree --stdin of known trees.' '
+	echo $tree_A $tree_B | git diff-tree -r --stdin > .test-a &&
+	echo $tree_A $tree_B > .test-recursive-ABx &&
+	cat .test-recursive-AB >> .test-recursive-ABx &&
+	cmp -s .test-a .test-recursive-ABx
+'
+
+test_expect_success 'diff-cache O with A in cache' '
+	git read-tree $tree_A &&
+	git diff-index --cached $tree_O >.test-a &&
+	cmp -s .test-a .test-recursive-OA
+'
+
+test_expect_success 'diff-cache O with B in cache' '
+	git read-tree $tree_B &&
+	git diff-index --cached $tree_O >.test-a &&
+	cmp -s .test-a .test-recursive-OB
+'
+
+test_expect_success 'diff-cache A with B in cache' '
+	git read-tree $tree_B &&
+	git diff-index --cached $tree_A >.test-a &&
+	cmp -s .test-a .test-recursive-AB
+'
+
+test_expect_success 'diff-files with O in cache and A checked out' '
+	rm -fr Z [A-Z][A-Z] &&
+	git read-tree $tree_A &&
+	git checkout-index -f -a &&
+	git read-tree --reset $tree_O &&
+	test_must_fail git update-index --refresh -q &&
+	git diff-files >.test-a &&
+	cmp_diff_files_output .test-a .test-recursive-OA
+'
+
+test_expect_success 'diff-files with O in cache and B checked out' '
+	rm -fr Z [A-Z][A-Z] &&
+	git read-tree $tree_B &&
+	git checkout-index -f -a &&
+	git read-tree --reset $tree_O &&
+	test_must_fail git update-index --refresh -q &&
+	git diff-files >.test-a &&
+	cmp_diff_files_output .test-a .test-recursive-OB
+'
+
+test_expect_success 'diff-files with A in cache and B checked out' '
+	rm -fr Z [A-Z][A-Z] &&
+	git read-tree $tree_B &&
+	git checkout-index -f -a &&
+	git read-tree --reset $tree_A &&
+	test_must_fail git update-index --refresh -q &&
+	git diff-files >.test-a &&
+	cmp_diff_files_output .test-a .test-recursive-AB
+'
 
 ################################################################
 # Now we have established the baseline, we do not have to
 # rely on individual object ID values that much.
 
-test_expect_success \
-    'diff-tree O A == diff-tree -R A O' \
-    'git diff-tree $tree_O $tree_A >.test-a &&
-    git diff-tree -R $tree_A $tree_O >.test-b &&
-    cmp -s .test-a .test-b'
-
-test_expect_success \
-    'diff-tree -r O A == diff-tree -r -R A O' \
-    'git diff-tree -r $tree_O $tree_A >.test-a &&
-    git diff-tree -r -R $tree_A $tree_O >.test-b &&
-    cmp -s .test-a .test-b'
-
-test_expect_success \
-    'diff-tree B A == diff-tree -R A B' \
-    'git diff-tree $tree_B $tree_A >.test-a &&
-    git diff-tree -R $tree_A $tree_B >.test-b &&
-    cmp -s .test-a .test-b'
-
-test_expect_success \
-    'diff-tree -r B A == diff-tree -r -R A B' \
-    'git diff-tree -r $tree_B $tree_A >.test-a &&
-    git diff-tree -r -R $tree_A $tree_B >.test-b &&
-    cmp -s .test-a .test-b'
-
-test_expect_success \
-    'diff can read from stdin' \
-    'test_must_fail git diff --no-index -- MN - < NN |
-        grep -v "^index" | sed "s#/-#/NN#" >.test-a &&
-    test_must_fail git diff --no-index -- MN NN |
-        grep -v "^index" >.test-b &&
-    test_cmp .test-a .test-b'
+test_expect_success 'diff-tree O A == diff-tree -R A O' '
+	git diff-tree $tree_O $tree_A >.test-a &&
+	git diff-tree -R $tree_A $tree_O >.test-b &&
+	cmp -s .test-a .test-b
+'
+
+test_expect_success 'diff-tree -r O A == diff-tree -r -R A O' '
+	git diff-tree -r $tree_O $tree_A >.test-a &&
+	git diff-tree -r -R $tree_A $tree_O >.test-b &&
+	cmp -s .test-a .test-b
+'
+
+test_expect_success 'diff-tree B A == diff-tree -R A B' '
+	git diff-tree $tree_B $tree_A >.test-a &&
+	git diff-tree -R $tree_A $tree_B >.test-b &&
+	cmp -s .test-a .test-b
+'
+
+test_expect_success 'diff-tree -r B A == diff-tree -r -R A B' '
+	git diff-tree -r $tree_B $tree_A >.test-a &&
+	git diff-tree -r -R $tree_A $tree_B >.test-b &&
+	cmp -s .test-a .test-b'
+
+test_expect_success 'diff can read from stdin' '
+	test_must_fail git diff --no-index -- MN - < NN |
+		sed "/^index/d; s#/-#/NN#" >.test-a &&
+	test_must_fail git diff --no-index -- MN NN |
+		grep -v "^index" >.test-b &&
+	test_cmp .test-a .test-b
+'
 
 test_done
diff --git a/t/t4003-diff-rename-1.sh b/t/t4003-diff-rename-1.sh
index df2accb..ebe0918 100755
--- a/t/t4003-diff-rename-1.sh
+++ b/t/t4003-diff-rename-1.sh
@@ -6,23 +6,25 @@
 test_description='More rename detection
 
 '
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
-. "$TEST_DIRECTORY"/diff-lib.sh ;# test-lib chdir's into trash
-
-test_expect_success \
-    'prepare reference tree' \
-    'cat "$TEST_DIRECTORY"/diff-lib/COPYING >COPYING &&
-     echo frotz >rezrov &&
-    git update-index --add COPYING rezrov &&
-    tree=$(git write-tree) &&
-    echo $tree'
-
-test_expect_success \
-    'prepare work tree' \
-    'sed -e 's/HOWEVER/However/' <COPYING >COPYING.1 &&
-    sed -e 's/GPL/G.P.L/g' <COPYING >COPYING.2 &&
-    rm -f COPYING &&
-    git update-index --add --remove COPYING COPYING.?'
+. "$TEST_DIRECTORY"/lib-diff.sh ;# test-lib chdir's into trash
+
+test_expect_success 'prepare reference tree' '
+	COPYING_test_data >COPYING &&
+	echo frotz >rezrov &&
+	git update-index --add COPYING rezrov &&
+	tree=$(git write-tree) &&
+	echo $tree
+'
+
+test_expect_success 'prepare work tree' '
+	sed -e 's/HOWEVER/However/' <COPYING >COPYING.1 &&
+	sed -e 's/GPL/G.P.L/g' <COPYING >COPYING.2 &&
+	rm -f COPYING &&
+	git update-index --add --remove COPYING COPYING.?
+'
 
 # tree has COPYING and rezrov.  work tree has COPYING.1 and COPYING.2,
 # both are slightly edited, and unchanged rezrov.  So we say you
@@ -55,14 +57,14 @@ rename to COPYING.2
 +	This file is licensed under the G.P.L v2, or a later version
 EOF
 
-test_expect_success \
-    'validate output from rename/copy detection (#1)' \
-    'compare_diff_patch current expected'
+test_expect_success 'validate output from rename/copy detection (#1)' '
+	compare_diff_patch current expected
+'
 
-test_expect_success \
-    'prepare work tree again' \
-    'mv COPYING.2 COPYING &&
-     git update-index --add --remove COPYING COPYING.1 COPYING.2'
+test_expect_success 'prepare work tree again' '
+	mv COPYING.2 COPYING &&
+	git update-index --add --remove COPYING COPYING.1 COPYING.2
+'
 
 # tree has COPYING and rezrov.  work tree has COPYING and COPYING.1,
 # both are slightly edited, and unchanged rezrov.  So we say you
@@ -93,14 +95,14 @@ copy to COPYING.1
 + However, in order to allow a migration to GPLv3 if that seems like
 EOF
 
-test_expect_success \
-    'validate output from rename/copy detection (#2)' \
-    'compare_diff_patch current expected'
+test_expect_success 'validate output from rename/copy detection (#2)' '
+	compare_diff_patch current expected
+'
 
-test_expect_success \
-    'prepare work tree once again' \
-    'cat "$TEST_DIRECTORY"/diff-lib/COPYING >COPYING &&
-     git update-index --add --remove COPYING COPYING.1'
+test_expect_success 'prepare work tree once again' '
+	COPYING_test_data >COPYING &&
+	git update-index --add --remove COPYING COPYING.1
+'
 
 # tree has COPYING and rezrov.  work tree has COPYING and COPYING.1,
 # but COPYING is not edited.  We say you copy-and-edit COPYING.1; this
@@ -121,8 +123,8 @@ copy to COPYING.1
 + However, in order to allow a migration to GPLv3 if that seems like
 EOF
 
-test_expect_success \
-    'validate output from rename/copy detection (#3)' \
-    'compare_diff_patch current expected'
+test_expect_success 'validate output from rename/copy detection (#3)' '
+	compare_diff_patch current expected
+'
 
 test_done
diff --git a/t/t4004-diff-rename-symlink.sh b/t/t4004-diff-rename-symlink.sh
index 6e562c8..1d70d4d 100755
--- a/t/t4004-diff-rename-symlink.sh
+++ b/t/t4004-diff-rename-symlink.sh
@@ -9,24 +9,26 @@ The rename detection logic should be able to detect pure rename or
 copy of symbolic links, but should not produce rename/copy followed
 by an edit for them.
 '
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
-. "$TEST_DIRECTORY"/diff-lib.sh
+. "$TEST_DIRECTORY"/lib-diff.sh
 
-test_expect_success SYMLINKS \
-    'prepare reference tree' \
-    'echo xyzzy | tr -d '\\\\'012 >yomin &&
-     ln -s xyzzy frotz &&
-    git update-index --add frotz yomin &&
-    tree=$(git write-tree) &&
-    echo $tree'
+test_expect_success SYMLINKS 'prepare reference tree' '
+	echo xyzzy | tr -d '\\\\'012 >yomin &&
+	ln -s xyzzy frotz &&
+	git update-index --add frotz yomin &&
+	tree=$(git write-tree) &&
+	echo $tree
+'
 
-test_expect_success SYMLINKS \
-    'prepare work tree' \
-    'mv frotz rezrov &&
-     rm -f yomin &&
-     ln -s xyzzy nitfol &&
-     ln -s xzzzy bozbar &&
-    git update-index --add --remove frotz rezrov nitfol bozbar yomin'
+test_expect_success SYMLINKS 'prepare work tree' '
+	mv frotz rezrov &&
+	rm -f yomin &&
+	ln -s xyzzy nitfol &&
+	ln -s xzzzy bozbar &&
+	git update-index --add --remove frotz rezrov nitfol bozbar yomin
+'
 
 # tree has frotz pointing at xyzzy, and yomin that contains xyzzy to
 # confuse things.  work tree has rezrov (xyzzy) nitfol (xyzzy) and
@@ -34,9 +36,9 @@ test_expect_success SYMLINKS \
 # rezrov and nitfol are rename/copy of frotz and bozbar should be
 # a new creation.
 
-test_expect_success SYMLINKS 'setup diff output' "
-    GIT_DIFF_OPTS=--unified=0 git diff-index -C -p $tree >current &&
-    cat >expected <<\EOF
+test_expect_success SYMLINKS 'setup diff output' '
+	GIT_DIFF_OPTS=--unified=0 git diff-index -C -p $tree >current &&
+	cat >expected <<\EOF
 diff --git a/bozbar b/bozbar
 new file mode 120000
 --- /dev/null
@@ -60,10 +62,10 @@ deleted file mode 100644
 -xyzzy
 \ No newline at end of file
 EOF
-"
+'
 
-test_expect_success SYMLINKS \
-    'validate diff output' \
-    'compare_diff_patch current expected'
+test_expect_success SYMLINKS 'validate diff output' '
+	compare_diff_patch current expected
+'
 
 test_done
diff --git a/t/t4005-diff-rename-2.sh b/t/t4005-diff-rename-2.sh
index d18a804..5c756dc 100755
--- a/t/t4005-diff-rename-2.sh
+++ b/t/t4005-diff-rename-2.sh
@@ -5,11 +5,13 @@
 
 test_description='Same rename detection as t4003 but testing diff-raw.'
 
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
-. "$TEST_DIRECTORY"/diff-lib.sh ;# test-lib chdir's into trash
+. "$TEST_DIRECTORY"/lib-diff.sh ;# test-lib chdir's into trash
 
 test_expect_success 'setup reference tree' '
-	cat "$TEST_DIRECTORY"/diff-lib/COPYING >COPYING &&
+	COPYING_test_data >COPYING &&
 	echo frotz >rezrov &&
 	git update-index --add COPYING rezrov &&
 	tree=$(git write-tree) &&
@@ -64,7 +66,7 @@ test_expect_success 'validate output from rename/copy detection (#2)' '
 # nows how to say Copy.
 
 test_expect_success 'validate output from rename/copy detection (#3)' '
-	cat "$TEST_DIRECTORY"/diff-lib/COPYING >COPYING &&
+	COPYING_test_data >COPYING &&
 	git update-index --add --remove COPYING COPYING.1 &&
 
 	cat <<-EOF >expected &&
diff --git a/t/t4006-diff-mode.sh b/t/t4006-diff-mode.sh
index 03489af..dbd4c0d 100755
--- a/t/t4006-diff-mode.sh
+++ b/t/t4006-diff-mode.sh
@@ -6,6 +6,8 @@
 test_description='Test mode change diffs.
 
 '
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 sed_script='s/\(:100644 100755\) \('"$OID_REGEX"'\) \2 /\1 X X /'
@@ -26,10 +28,8 @@ test_expect_success 'chmod' '
 '
 
 test_expect_success 'prepare binary file' '
-	git commit -m rezrov &&
-	printf "\00\01\02\03\04\05\06" >binbin &&
-	git add binbin &&
-	git commit -m binbin
+	git commit -m one &&
+	test_commit --printf two binbin "\00\01\02\03\04\05\06"
 '
 
 test_expect_success '--stat output after text chmod' '
@@ -39,13 +39,13 @@ test_expect_success '--stat output after text chmod' '
 	 1 file changed, 0 insertions(+), 0 deletions(-)
 	EOF
 	git diff HEAD --stat >actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 test_expect_success '--shortstat output after text chmod' '
 	tail -n 1 <expect >expect.short &&
 	git diff HEAD --shortstat >actual &&
-	test_i18ncmp expect.short actual
+	test_cmp expect.short actual
 '
 
 test_expect_success '--stat output after binary chmod' '
@@ -56,13 +56,13 @@ test_expect_success '--stat output after binary chmod' '
 	 2 files changed, 0 insertions(+), 0 deletions(-)
 	EOF
 	git diff HEAD --stat >actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 test_expect_success '--shortstat output after binary chmod' '
 	tail -n 1 <expect >expect.short &&
 	git diff HEAD --shortstat >actual &&
-	test_i18ncmp expect.short actual
+	test_cmp expect.short actual
 '
 
 test_done
diff --git a/t/t4007-rename-3.sh b/t/t4007-rename-3.sh
index b187b7f..b86165c 100755
--- a/t/t4007-rename-3.sh
+++ b/t/t4007-rename-3.sh
@@ -6,18 +6,19 @@
 test_description='Rename interaction with pathspec.
 
 '
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
-. "$TEST_DIRECTORY"/diff-lib.sh ;# test-lib chdir's into trash
+. "$TEST_DIRECTORY"/lib-diff.sh ;# test-lib chdir's into trash
 
 test_expect_success 'prepare reference tree' '
 	mkdir path0 path1 &&
-	cp "$TEST_DIRECTORY"/diff-lib/COPYING path0/COPYING &&
+	COPYING_test_data >path0/COPYING &&
 	git update-index --add path0/COPYING &&
 	tree=$(git write-tree) &&
-	echo $tree
+	blob=$(git rev-parse :path0/COPYING)
 '
 
-blob=$(git hash-object "$TEST_DIRECTORY/diff-lib/COPYING")
 test_expect_success 'prepare work tree' '
 	cp path0/COPYING path1/COPYING &&
 	git update-index --add --remove path0/COPYING path1/COPYING
diff --git a/t/t4008-diff-break-rewrite.sh b/t/t4008-diff-break-rewrite.sh
index b1ccd41..562aaf3 100755
--- a/t/t4008-diff-break-rewrite.sh
+++ b/t/t4008-diff-break-rewrite.sh
@@ -22,11 +22,11 @@ With -B, this should be detected as two complete rewrites.
 Further, with -B and -M together, these should turn into two renames.
 '
 . ./test-lib.sh
-. "$TEST_DIRECTORY"/diff-lib.sh ;# test-lib chdir's into trash
+. "$TEST_DIRECTORY"/lib-diff.sh ;# test-lib chdir's into trash
 
 test_expect_success setup '
-	cat "$TEST_DIRECTORY"/diff-lib/README >file0 &&
-	cat "$TEST_DIRECTORY"/diff-lib/COPYING >file1 &&
+	echo some dissimilar content >file0 &&
+	COPYING_test_data >file1 &&
 	blob0_id=$(git hash-object file0) &&
 	blob1_id=$(git hash-object file1) &&
 	git update-index --add file0 file1 &&
diff --git a/t/t4009-diff-rename-4.sh b/t/t4009-diff-rename-4.sh
index b63bdf0..3480781 100755
--- a/t/t4009-diff-rename-4.sh
+++ b/t/t4009-diff-rename-4.sh
@@ -6,12 +6,14 @@
 test_description='Same rename detection as t4003 but testing diff-raw -z.
 
 '
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
-. "$TEST_DIRECTORY"/diff-lib.sh ;# test-lib chdir's into trash
+. "$TEST_DIRECTORY"/lib-diff.sh ;# test-lib chdir's into trash
 
 test_expect_success \
     'prepare reference tree' \
-    'cat "$TEST_DIRECTORY"/diff-lib/COPYING >COPYING &&
+    'COPYING_test_data >COPYING &&
      echo frotz >rezrov &&
     git update-index --add COPYING rezrov &&
     orig=$(git hash-object COPYING) &&
@@ -81,7 +83,7 @@ test_expect_success \
 
 test_expect_success \
     'prepare work tree once again' \
-    'cat "$TEST_DIRECTORY"/diff-lib/COPYING >COPYING &&
+    'COPYING_test_data >COPYING &&
      git update-index --add --remove COPYING COPYING.1'
 
 git diff-index -z -C --find-copies-harder $tree >current
diff --git a/t/t4010-diff-pathspec.sh b/t/t4010-diff-pathspec.sh
index 65cc703..9d9650e 100755
--- a/t/t4010-diff-pathspec.sh
+++ b/t/t4010-diff-pathspec.sh
@@ -9,8 +9,10 @@ Prepare:
         file0
         path1/file1
 '
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
-. "$TEST_DIRECTORY"/diff-lib.sh ;# test-lib chdir's into trash
+. "$TEST_DIRECTORY"/lib-diff.sh ;# test-lib chdir's into trash
 
 test_expect_success \
     setup \
diff --git a/t/t4011-diff-symlink.sh b/t/t4011-diff-symlink.sh
index 717034b..bc8ba88 100755
--- a/t/t4011-diff-symlink.sh
+++ b/t/t4011-diff-symlink.sh
@@ -6,18 +6,20 @@
 test_description='Test diff of symlinks.
 
 '
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
-. "$TEST_DIRECTORY"/diff-lib.sh
+. "$TEST_DIRECTORY"/lib-diff.sh
 
 # Print the short OID of a symlink with the given name.
 symlink_oid () {
-	local oid=$(printf "%s" "$1" | git hash-object --stdin) &&
+	local oid="$(printf "%s" "$1" | git hash-object --stdin)" &&
 	git rev-parse --short "$oid"
 }
 
 # Print the short OID of the given file.
 short_oid () {
-	local oid=$(git hash-object "$1") &&
+	local oid="$(git hash-object "$1")" &&
 	git rev-parse --short "$oid"
 }
 
diff --git a/t/t4012-diff-binary.sh b/t/t4012-diff-binary.sh
index 6579c81..c64d9d2 100755
--- a/t/t4012-diff-binary.sh
+++ b/t/t4012-diff-binary.sh
@@ -6,6 +6,7 @@
 test_description='Binary diff and apply
 '
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 cat >expect.binary-numstat <<\EOF
@@ -34,19 +35,19 @@ EOF
 test_expect_success 'apply --stat output for binary file change' '
 	git diff >diff &&
 	git apply --stat --summary <diff >current &&
-	test_i18ncmp expected current
+	test_cmp expected current
 '
 
 test_expect_success 'diff --shortstat output for binary file change' '
 	tail -n 1 expected >expect &&
 	git diff --shortstat >current &&
-	test_i18ncmp expect current
+	test_cmp expect current
 '
 
 test_expect_success 'diff --shortstat output for binary file change only' '
 	echo " 1 file changed, 0 insertions(+), 0 deletions(-)" >expected &&
 	git diff --shortstat -- b >current &&
-	test_i18ncmp expected current
+	test_cmp expected current
 '
 
 test_expect_success 'apply --numstat notices binary file change' '
@@ -63,7 +64,7 @@ test_expect_success 'apply --numstat understands diff --binary format' '
 
 # apply needs to be able to skip the binary material correctly
 # in order to report the line number of a corrupt patch.
-test_expect_success C_LOCALE_OUTPUT 'apply detecting corrupt patch correctly' '
+test_expect_success 'apply detecting corrupt patch correctly' '
 	git diff >output &&
 	sed -e "s/-CIT/xCIT/" <output >broken &&
 	test_must_fail git apply --stat --summary broken 2>detected &&
@@ -73,7 +74,7 @@ test_expect_success C_LOCALE_OUTPUT 'apply detecting corrupt patch correctly' '
 	test "$detected" = xCIT
 '
 
-test_expect_success C_LOCALE_OUTPUT 'apply detecting corrupt patch correctly' '
+test_expect_success 'apply detecting corrupt patch correctly' '
 	git diff --binary | sed -e "s/-CIT/xCIT/" >broken &&
 	test_must_fail git apply --stat --summary broken 2>detected &&
 	detected=$(cat detected) &&
@@ -112,20 +113,20 @@ test_expect_success 'diff --no-index with binary creation' '
 '
 
 cat >expect <<EOF
- binfile  |   Bin 0 -> 1026 bytes
- textfile | 10000 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+ binfilë  |   Bin 0 -> 1026 bytes
+ tëxtfilë | 10000 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 EOF
 
 test_expect_success 'diff --stat with binary files and big change count' '
-	printf "\01\00%1024d" 1 >binfile &&
-	git add binfile &&
+	printf "\01\00%1024d" 1 >binfilë &&
+	git add binfilë &&
 	i=0 &&
 	while test $i -lt 10000; do
 		echo $i &&
-		i=$(($i + 1))
-	done >textfile &&
-	git add textfile &&
-	git diff --cached --stat binfile textfile >output &&
+		i=$(($i + 1)) || return 1
+	done >tëxtfilë &&
+	git add tëxtfilë &&
+	git -c core.quotepath=false diff --cached --stat binfilë tëxtfilë >output &&
 	grep " | " output >actual &&
 	test_cmp expect actual
 '
diff --git a/t/t4013-diff-various.sh b/t/t4013-diff-various.sh
index 3f60f7d..3855d68 100755
--- a/t/t4013-diff-various.sh
+++ b/t/t4013-diff-various.sh
@@ -5,7 +5,11 @@
 
 test_description='Various diff formatting options'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=master
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-diff.sh
 
 test_expect_success setup '
 
@@ -15,8 +19,8 @@ test_expect_success setup '
 
 	mkdir dir &&
 	mkdir dir2 &&
-	for i in 1 2 3; do echo $i; done >file0 &&
-	for i in A B; do echo $i; done >dir/sub &&
+	test_write_lines 1 2 3 >file0 &&
+	test_write_lines A B >dir/sub &&
 	cat file0 >file2 &&
 	git add file0 file2 dir/sub &&
 	git commit -m Initial &&
@@ -28,8 +32,8 @@ test_expect_success setup '
 	GIT_COMMITTER_DATE="2006-06-26 00:01:00 +0000" &&
 	export GIT_AUTHOR_DATE GIT_COMMITTER_DATE &&
 
-	for i in 4 5 6; do echo $i; done >>file0 &&
-	for i in C D; do echo $i; done >>dir/sub &&
+	test_write_lines 4 5 6 >>file0 &&
+	test_write_lines C D >>dir/sub &&
 	rm -f file2 &&
 	git update-index --remove file0 file2 dir/sub &&
 	git commit -m "Second${LF}${LF}This is the second commit." &&
@@ -38,9 +42,9 @@ test_expect_success setup '
 	GIT_COMMITTER_DATE="2006-06-26 00:02:00 +0000" &&
 	export GIT_AUTHOR_DATE GIT_COMMITTER_DATE &&
 
-	for i in A B C; do echo $i; done >file1 &&
+	test_write_lines A B C >file1 &&
 	git add file1 &&
-	for i in E F; do echo $i; done >>dir/sub &&
+	test_write_lines E F >>dir/sub &&
 	git update-index dir/sub &&
 	git commit -m Third &&
 
@@ -49,8 +53,8 @@ test_expect_success setup '
 	export GIT_AUTHOR_DATE GIT_COMMITTER_DATE &&
 
 	git checkout side &&
-	for i in A B C; do echo $i; done >>file0 &&
-	for i in 1 2; do echo $i; done >>dir/sub &&
+	test_write_lines A B C >>file0 &&
+	test_write_lines 1 2 >>dir/sub &&
 	cat dir/sub >file3 &&
 	git add file3 &&
 	git update-index file0 dir/sub &&
@@ -61,14 +65,14 @@ test_expect_success setup '
 	export GIT_AUTHOR_DATE GIT_COMMITTER_DATE &&
 
 	git checkout master &&
-	git pull -s ours . side &&
+	git pull -s ours --no-rebase . side &&
 
 	GIT_AUTHOR_DATE="2006-06-26 00:05:00 +0000" &&
 	GIT_COMMITTER_DATE="2006-06-26 00:05:00 +0000" &&
 	export GIT_AUTHOR_DATE GIT_COMMITTER_DATE &&
 
-	for i in A B C; do echo $i; done >>file0 &&
-	for i in 1 2; do echo $i; done >>dir/sub &&
+	test_write_lines A B C >>file0 &&
+	test_write_lines 1 2 >>dir/sub &&
 	git update-index file0 dir/sub &&
 
 	mkdir dir3 &&
@@ -82,7 +86,7 @@ test_expect_success setup '
 	GIT_COMMITTER_DATE="2006-06-26 00:06:00 +0000" &&
 	export GIT_AUTHOR_DATE GIT_COMMITTER_DATE &&
 	git checkout -b rearrange initial &&
-	for i in B A; do echo $i; done >dir/sub &&
+	test_write_lines B A >dir/sub &&
 	git add dir/sub &&
 	git commit -m "Rearranged lines in dir/sub" &&
 	git checkout master &&
@@ -130,27 +134,45 @@ test_expect_success setup '
 EOF
 
 process_diffs () {
-	_x04="[0-9a-f][0-9a-f][0-9a-f][0-9a-f]" &&
-	_x07="$_x05[0-9a-f][0-9a-f]" &&
-	sed -e "s/$OID_REGEX/$ZERO_OID/g" \
-	    -e "s/From $_x40 /From $ZERO_OID /" \
-	    -e "s/from $_x40)/from $ZERO_OID)/" \
-	    -e "s/commit $_x40\$/commit $ZERO_OID/" \
-	    -e "s/commit $_x40 (/commit $ZERO_OID (/" \
-	    -e "s/$_x40 $_x40 $_x40/$ZERO_OID $ZERO_OID $ZERO_OID/" \
-	    -e "s/$_x40 $_x40 /$ZERO_OID $ZERO_OID /" \
-	    -e "s/^$_x40 $_x40$/$ZERO_OID $ZERO_OID/" \
-	    -e "s/^$_x40 /$ZERO_OID /" \
-	    -e "s/^$_x40$/$ZERO_OID/" \
-	    -e "s/$_x07\.\.$_x07/fffffff..fffffff/g" \
-	    -e "s/$_x07,$_x07\.\.$_x07/fffffff,fffffff..fffffff/g" \
-	    -e "s/$_x07 $_x07 $_x07/fffffff fffffff fffffff/g" \
-	    -e "s/$_x07 $_x07 /fffffff fffffff /g" \
-	    -e "s/Merge: $_x07 $_x07/Merge: fffffff fffffff/g" \
-	    -e "s/$_x07\.\.\./fffffff.../g" \
-	    -e "s/ $_x04\.\.\./ ffff.../g" \
-	    -e "s/ $_x04/ ffff/g" \
-	    "$1"
+	perl -e '
+		my $oid_length = length($ARGV[0]);
+		my $x40 = "[0-9a-f]{40}";
+		my $xab = "[0-9a-f]{4,16}";
+		my $orx = "[0-9a-f]" x $oid_length;
+
+		sub munge_oid {
+			my ($oid) = @_;
+			my $x;
+
+			return "" unless length $oid;
+
+			if ($oid =~ /^(100644|100755|120000)$/) {
+				return $oid;
+			}
+
+			if ($oid =~ /^0*$/) {
+				$x = "0";
+			} else {
+				$x = "f";
+			}
+
+			if (length($oid) == 40) {
+				return $x x $oid_length;
+			} else {
+				return $x x length($oid);
+			}
+		}
+
+		while (<STDIN>) {
+			s/($orx)/munge_oid($1)/ge;
+			s/From ($x40)( |\))/"From " . munge_oid($1) . $2/ge;
+			s/commit ($x40)($| \(from )($x40?)/"commit " .  munge_oid($1) . $2 . munge_oid($3)/ge;
+			s/\b($x40)( |\.\.|$)/munge_oid($1) . $2/ge;
+			s/^($x40)($| )/munge_oid($1) . $2/e;
+			s/($xab)(\.\.|,| |\.\.\.|$)/munge_oid($1) . $2/ge;
+			print;
+		}
+	' "$ZERO_OID" <"$1"
 }
 
 V=$(git version | sed -e 's/^git version //' -e 's/\./\\./g')
@@ -159,18 +181,20 @@ do
 	case "$magic" in
 	'' | '#'*)
 		continue ;;
-	:*)
-		magic=${magic#:}
+	:noellipses)
+		magic=noellipses
 		label="$magic-$cmd"
-		case "$magic" in
-		noellipses) ;;
-		*)
-			BUG "unknown magic $magic" ;;
-		esac ;;
+		;;
+	:*)
+		BUG "unknown magic $magic"
+		;;
 	*)
-		cmd="$magic $cmd" magic=
-		label="$cmd" ;;
+		cmd="$magic $cmd"
+		magic=
+		label="$cmd"
+		;;
 	esac
+
 	test=$(echo "$label" | sed -e 's|[/ ][/ ]*|_|g')
 	pfx=$(printf "%04d" $test_count)
 	expect="$TEST_DIRECTORY/t4013/diff.$test"
@@ -195,7 +219,7 @@ do
 			process_diffs "$expect" >expect &&
 			case $cmd in
 			*format-patch* | *-stat*)
-				test_i18ncmp expect actual;;
+				test_cmp expect actual;;
 			*)
 				test_cmp expect actual;;
 			esac &&
@@ -221,6 +245,9 @@ diff-tree --root -r --abbrev=4 initial
 :noellipses diff-tree --root -r --abbrev=4 initial
 diff-tree -p initial
 diff-tree --root -p initial
+diff-tree --root -p --abbrev=10 initial
+diff-tree --root -p --full-index initial
+diff-tree --root -p --full-index --abbrev=10 initial
 diff-tree --patch-with-stat initial
 diff-tree --root --patch-with-stat initial
 diff-tree --patch-with-raw initial
@@ -263,6 +290,7 @@ diff-tree --stat initial mode
 diff-tree --summary initial mode
 
 diff-tree master
+diff-tree -m master
 diff-tree -p master
 diff-tree -p -m master
 diff-tree -c master
@@ -297,9 +325,18 @@ log --root --patch-with-stat --summary master
 log --root -c --patch-with-stat --summary master
 # improved by Timo's patch
 log --root --cc --patch-with-stat --summary master
+log --no-diff-merges -p --first-parent master
+log --diff-merges=off -p --first-parent master
+log --first-parent --diff-merges=off -p master
 log -p --first-parent master
+log -p --diff-merges=first-parent master
+log --diff-merges=first-parent master
 log -m -p --first-parent master
 log -m -p master
+log --cc -m -p master
+log -c -m -p master
+log -m --raw master
+log -m --stat master
 log -SF master
 log -S F master
 log -SF -p master
@@ -309,8 +346,11 @@ log -SF master --max-count=2
 log -GF master
 log -GF -p master
 log -GF -p --pickaxe-all master
+log -IA -IB -I1 -I2 -p master
 log --decorate --all
 log --decorate=full --all
+log --decorate --clear-decorations --all
+log --decorate=full --clear-decorations --all
 
 rev-list --parents HEAD
 rev-list --children HEAD
@@ -414,12 +454,72 @@ diff-tree --stat --compact-summary initial mode
 diff-tree -R --stat --compact-summary initial mode
 EOF
 
+test_expect_success 'log -m matches pure log' '
+	git log master >result &&
+	process_diffs result >expected &&
+	git log -m >result &&
+	process_diffs result >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'log --diff-merges=on matches --diff-merges=separate' '
+	git log -p --diff-merges=separate master >result &&
+	process_diffs result >expected &&
+	git log -p --diff-merges=on master >result &&
+	process_diffs result >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'log --dd matches --diff-merges=1 -p' '
+	git log --diff-merges=1 -p master >result &&
+	process_diffs result >expected &&
+	git log --dd master >result &&
+	process_diffs result >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'deny wrong log.diffMerges config' '
+	test_config log.diffMerges wrong-value &&
+	test_expect_code 128 git log
+'
+
+test_expect_success 'git config log.diffMerges first-parent' '
+	git log -p --diff-merges=first-parent master >result &&
+	process_diffs result >expected &&
+	test_config log.diffMerges first-parent &&
+	git log -p --diff-merges=on master >result &&
+	process_diffs result >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'git config log.diffMerges first-parent vs -m' '
+	git log -p --diff-merges=first-parent master >result &&
+	process_diffs result >expected &&
+	test_config log.diffMerges first-parent &&
+	git log -p -m master >result &&
+	process_diffs result >actual &&
+	test_cmp expected actual
+'
+
+# -m in "git diff-index" means "match missing", that differs
+# from its meaning in "git diff". Let's check it in diff-index.
+# The line in the output for removed file should disappear when
+# we provide -m in diff-index.
+test_expect_success 'git diff-index -m' '
+	rm -f file1 &&
+	git diff-index HEAD >without-m &&
+	lines_count=$(wc -l <without-m) &&
+	git diff-index -m HEAD >with-m &&
+	git restore file1 &&
+	test_line_count = $((lines_count - 1)) with-m
+'
+
 test_expect_success 'log -S requires an argument' '
 	test_must_fail git log -S
 '
 
 test_expect_success 'diff --cached on unborn branch' '
-	echo ref: refs/heads/unborn >.git/HEAD &&
+	git symbolic-ref HEAD refs/heads/unborn &&
 	git diff --cached >result &&
 	process_diffs result >actual &&
 	process_diffs "$TEST_DIRECTORY/t4013/diff.diff_--cached" >expected &&
@@ -449,4 +549,159 @@ test_expect_success 'diff-tree --stdin with log formatting' '
 	test_cmp expect actual
 '
 
+test_expect_success 'diff-tree --stdin with pathspec' '
+	cat >expect <<-EOF &&
+	Third
+
+	dir/sub
+	Second
+
+	dir/sub
+	EOF
+	git rev-list master^ |
+	git diff-tree -r --stdin --name-only --format=%s dir >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'show A B ... -- <pathspec>' '
+	# side touches dir/sub, file0, and file3
+	# master^ touches dir/sub, and file1
+	# master^^ touches dir/sub, file0, and file2
+	git show --name-only --format="<%s>" side master^ master^^ -- dir >actual &&
+	cat >expect <<-\EOF &&
+	<Side>
+
+	dir/sub
+	<Third>
+
+	dir/sub
+	<Second>
+
+	dir/sub
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'diff -I<regex>: setup' '
+	git checkout master &&
+	test_seq 50 >file0 &&
+	git commit -m "Set up -I<regex> test file" file0 &&
+	test_seq 50 | sed -e "s/13/ten and three/" -e "/7\$/d" >file0 &&
+	echo >>file0
+'
+test_expect_success 'diff -I<regex>' '
+	git diff --ignore-blank-lines -I"ten.*e" -I"^[124-9]" >actual &&
+	cat >expect <<-\EOF &&
+	diff --git a/file0 b/file0
+	--- a/file0
+	+++ b/file0
+	@@ -34,7 +31,6 @@
+	 34
+	 35
+	 36
+	-37
+	 38
+	 39
+	 40
+	EOF
+	compare_diff_patch expect actual
+'
+
+test_expect_success 'diff -I<regex> --stat' '
+	git diff --stat --ignore-blank-lines -I"ten.*e" -I"^[124-9]" >actual &&
+	cat >expect <<-\EOF &&
+	 file0 | 1 -
+	 1 file changed, 1 deletion(-)
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'diff -I<regex>: detect malformed regex' '
+	test_expect_code 129 git diff --ignore-matching-lines="^[124-9" 2>error &&
+	test_grep "invalid regex given to -I: " error
+'
+
+# check_prefix <patch> <src> <dst>
+# check only lines with paths to avoid dependency on exact oid/contents
+check_prefix () {
+	grep -E '^(diff|---|\+\+\+) ' "$1" >actual.paths &&
+	cat >expect <<-EOF &&
+	diff --git $2 $3
+	--- $2
+	+++ $3
+	EOF
+	test_cmp expect actual.paths
+}
+
+test_expect_success 'diff-files does not respect diff.noPrefix' '
+	git -c diff.noPrefix diff-files -p >actual &&
+	check_prefix actual a/file0 b/file0
+'
+
+test_expect_success 'diff-files respects --no-prefix' '
+	git diff-files -p --no-prefix >actual &&
+	check_prefix actual file0 file0
+'
+
+test_expect_success 'diff respects diff.noPrefix' '
+	git -c diff.noPrefix diff >actual &&
+	check_prefix actual file0 file0
+'
+
+test_expect_success 'diff --default-prefix overrides diff.noPrefix' '
+	git -c diff.noPrefix diff --default-prefix >actual &&
+	check_prefix actual a/file0 b/file0
+'
+
+test_expect_success 'diff respects diff.mnemonicPrefix' '
+	git -c diff.mnemonicPrefix diff >actual &&
+	check_prefix actual i/file0 w/file0
+'
+
+test_expect_success 'diff --default-prefix overrides diff.mnemonicPrefix' '
+	git -c diff.mnemonicPrefix diff --default-prefix >actual &&
+	check_prefix actual a/file0 b/file0
+'
+
+test_expect_success 'diff respects diff.srcPrefix' '
+	git -c diff.srcPrefix=x/ diff >actual &&
+	check_prefix actual x/file0 b/file0
+'
+
+test_expect_success 'diff respects diff.dstPrefix' '
+	git -c diff.dstPrefix=y/ diff >actual &&
+	check_prefix actual a/file0 y/file0
+'
+
+test_expect_success 'diff --src-prefix overrides diff.srcPrefix' '
+	git -c diff.srcPrefix=y/ diff --src-prefix=z/ >actual &&
+	check_prefix actual z/file0 b/file0
+'
+
+test_expect_success 'diff --dst-prefix overrides diff.dstPrefix' '
+	git -c diff.dstPrefix=y/ diff --dst-prefix=z/ >actual &&
+	check_prefix actual a/file0 z/file0
+'
+
+test_expect_success 'diff.{src,dst}Prefix ignored with diff.noPrefix' '
+	git -c diff.dstPrefix=y/ -c diff.srcPrefix=x/ -c diff.noPrefix diff >actual &&
+	check_prefix actual file0 file0
+'
+
+test_expect_success 'diff.{src,dst}Prefix ignored with diff.mnemonicPrefix' '
+	git -c diff.dstPrefix=x/ -c diff.srcPrefix=y/ -c diff.mnemonicPrefix diff >actual &&
+	check_prefix actual i/file0 w/file0
+'
+
+test_expect_success 'diff.{src,dst}Prefix ignored with --default-prefix' '
+	git -c diff.dstPrefix=x/ -c diff.srcPrefix=y/ diff --default-prefix >actual &&
+	check_prefix actual a/file0 b/file0
+'
+
+test_expect_success 'diff --no-renames cannot be abbreviated' '
+	test_expect_code 129 git diff --no-rename >actual 2>error &&
+	test_must_be_empty actual &&
+	grep "invalid option: --no-rename" error
+'
+
 test_done
diff --git a/t/t4013/diff.diff-tree_--root_-p_--abbrev=10_initial b/t/t4013/diff.diff-tree_--root_-p_--abbrev=10_initial
new file mode 100644
index 0000000..7518a90
--- /dev/null
+++ b/t/t4013/diff.diff-tree_--root_-p_--abbrev=10_initial
@@ -0,0 +1,29 @@
+$ git diff-tree --root -p --abbrev=10 initial
+444ac553ac7612cc88969031b02b3767fb8a353a
+diff --git a/dir/sub b/dir/sub
+new file mode 100644
+index 0000000000..35d242ba79
+--- /dev/null
++++ b/dir/sub
+@@ -0,0 +1,2 @@
++A
++B
+diff --git a/file0 b/file0
+new file mode 100644
+index 0000000000..01e79c32a8
+--- /dev/null
++++ b/file0
+@@ -0,0 +1,3 @@
++1
++2
++3
+diff --git a/file2 b/file2
+new file mode 100644
+index 0000000000..01e79c32a8
+--- /dev/null
++++ b/file2
+@@ -0,0 +1,3 @@
++1
++2
++3
+$
diff --git a/t/t4013/diff.diff-tree_--root_-p_--full-index_--abbrev=10_initial b/t/t4013/diff.diff-tree_--root_-p_--full-index_--abbrev=10_initial
new file mode 100644
index 0000000..69f913f
--- /dev/null
+++ b/t/t4013/diff.diff-tree_--root_-p_--full-index_--abbrev=10_initial
@@ -0,0 +1,29 @@
+$ git diff-tree --root -p --full-index --abbrev=10 initial
+444ac553ac7612cc88969031b02b3767fb8a353a
+diff --git a/dir/sub b/dir/sub
+new file mode 100644
+index 0000000000000000000000000000000000000000..35d242ba79ae89ac695e26b3d4c27a8e6f028f9e
+--- /dev/null
++++ b/dir/sub
+@@ -0,0 +1,2 @@
++A
++B
+diff --git a/file0 b/file0
+new file mode 100644
+index 0000000000000000000000000000000000000000..01e79c32a8c99c557f0757da7cb6d65b3414466d
+--- /dev/null
++++ b/file0
+@@ -0,0 +1,3 @@
++1
++2
++3
+diff --git a/file2 b/file2
+new file mode 100644
+index 0000000000000000000000000000000000000000..01e79c32a8c99c557f0757da7cb6d65b3414466d
+--- /dev/null
++++ b/file2
+@@ -0,0 +1,3 @@
++1
++2
++3
+$
diff --git a/t/t4013/diff.diff-tree_--root_-p_--full-index_initial b/t/t4013/diff.diff-tree_--root_-p_--full-index_initial
new file mode 100644
index 0000000..1b0b671
--- /dev/null
+++ b/t/t4013/diff.diff-tree_--root_-p_--full-index_initial
@@ -0,0 +1,29 @@
+$ git diff-tree --root -p --full-index initial
+444ac553ac7612cc88969031b02b3767fb8a353a
+diff --git a/dir/sub b/dir/sub
+new file mode 100644
+index 0000000000000000000000000000000000000000..35d242ba79ae89ac695e26b3d4c27a8e6f028f9e
+--- /dev/null
++++ b/dir/sub
+@@ -0,0 +1,2 @@
++A
++B
+diff --git a/file0 b/file0
+new file mode 100644
+index 0000000000000000000000000000000000000000..01e79c32a8c99c557f0757da7cb6d65b3414466d
+--- /dev/null
++++ b/file0
+@@ -0,0 +1,3 @@
++1
++2
++3
+diff --git a/file2 b/file2
+new file mode 100644
+index 0000000000000000000000000000000000000000..01e79c32a8c99c557f0757da7cb6d65b3414466d
+--- /dev/null
++++ b/file2
+@@ -0,0 +1,3 @@
++1
++2
++3
+$
diff --git a/t/t4013/diff.diff-tree_-m_master b/t/t4013/diff.diff-tree_-m_master
new file mode 100644
index 0000000..6d0a220
--- /dev/null
+++ b/t/t4013/diff.diff-tree_-m_master
@@ -0,0 +1,11 @@
+$ git diff-tree -m master
+59d314ad6f356dd08601a4cd5e530381da3e3c64
+:040000 040000 65f5c9dd60ce3b2b3324b618ac7accf8d912c113 0564e026437809817a64fff393079714b6dd4628 M	dir
+:100644 100644 b414108e81e5091fe0974a1858b4d0d22b107f70 10a8a9f3657f91a156b9f0184ed79a20adef9f7f M	file0
+59d314ad6f356dd08601a4cd5e530381da3e3c64
+:040000 040000 f977ed46ae6873c1c30ab878e15a4accedc3618b 0564e026437809817a64fff393079714b6dd4628 M	dir
+:100644 100644 f4615da674c09df322d6ba8d6b21ecfb1b1ba510 10a8a9f3657f91a156b9f0184ed79a20adef9f7f M	file0
+:000000 100644 0000000000000000000000000000000000000000 b1e67221afe8461efd244b487afca22d46b95eb8 A	file1
+:100644 000000 01e79c32a8c99c557f0757da7cb6d65b3414466d 0000000000000000000000000000000000000000 D	file2
+:100644 000000 7289e35bff32727c08dda207511bec138fdb9ea5 0000000000000000000000000000000000000000 D	file3
+$
diff --git a/t/t4013/diff.log_--cc_-m_-p_master b/t/t4013/diff.log_--cc_-m_-p_master
new file mode 100644
index 0000000..7c217cf
--- /dev/null
+++ b/t/t4013/diff.log_--cc_-m_-p_master
@@ -0,0 +1,200 @@
+$ git log --cc -m -p master
+commit 59d314ad6f356dd08601a4cd5e530381da3e3c64 (from 9a6d4949b6b76956d9d5e26f2791ec2ceff5fdc0)
+Merge: 9a6d494 c7a2ab9
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:04:00 2006 +0000
+
+    Merge branch 'side'
+
+diff --git a/dir/sub b/dir/sub
+index cead32e..992913c 100644
+--- a/dir/sub
++++ b/dir/sub
+@@ -4,3 +4,5 @@ C
+ D
+ E
+ F
++1
++2
+diff --git a/file0 b/file0
+index b414108..10a8a9f 100644
+--- a/file0
++++ b/file0
+@@ -4,3 +4,6 @@
+ 4
+ 5
+ 6
++A
++B
++C
+
+commit 59d314ad6f356dd08601a4cd5e530381da3e3c64 (from c7a2ab9e8eac7b117442a607d5a9b3950ae34d5a)
+Merge: 9a6d494 c7a2ab9
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:04:00 2006 +0000
+
+    Merge branch 'side'
+
+diff --git a/dir/sub b/dir/sub
+index 7289e35..992913c 100644
+--- a/dir/sub
++++ b/dir/sub
+@@ -1,4 +1,8 @@
+ A
+ B
++C
++D
++E
++F
+ 1
+ 2
+diff --git a/file0 b/file0
+index f4615da..10a8a9f 100644
+--- a/file0
++++ b/file0
+@@ -1,6 +1,9 @@
+ 1
+ 2
+ 3
++4
++5
++6
+ A
+ B
+ C
+diff --git a/file1 b/file1
+new file mode 100644
+index 0000000..b1e6722
+--- /dev/null
++++ b/file1
+@@ -0,0 +1,3 @@
++A
++B
++C
+diff --git a/file2 b/file2
+deleted file mode 100644
+index 01e79c3..0000000
+--- a/file2
++++ /dev/null
+@@ -1,3 +0,0 @@
+-1
+-2
+-3
+diff --git a/file3 b/file3
+deleted file mode 100644
+index 7289e35..0000000
+--- a/file3
++++ /dev/null
+@@ -1,4 +0,0 @@
+-A
+-B
+-1
+-2
+
+commit c7a2ab9e8eac7b117442a607d5a9b3950ae34d5a
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:03:00 2006 +0000
+
+    Side
+
+diff --git a/dir/sub b/dir/sub
+index 35d242b..7289e35 100644
+--- a/dir/sub
++++ b/dir/sub
+@@ -1,2 +1,4 @@
+ A
+ B
++1
++2
+diff --git a/file0 b/file0
+index 01e79c3..f4615da 100644
+--- a/file0
++++ b/file0
+@@ -1,3 +1,6 @@
+ 1
+ 2
+ 3
++A
++B
++C
+diff --git a/file3 b/file3
+new file mode 100644
+index 0000000..7289e35
+--- /dev/null
++++ b/file3
+@@ -0,0 +1,4 @@
++A
++B
++1
++2
+
+commit 9a6d4949b6b76956d9d5e26f2791ec2ceff5fdc0
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:02:00 2006 +0000
+
+    Third
+
+diff --git a/dir/sub b/dir/sub
+index 8422d40..cead32e 100644
+--- a/dir/sub
++++ b/dir/sub
+@@ -2,3 +2,5 @@ A
+ B
+ C
+ D
++E
++F
+diff --git a/file1 b/file1
+new file mode 100644
+index 0000000..b1e6722
+--- /dev/null
++++ b/file1
+@@ -0,0 +1,3 @@
++A
++B
++C
+
+commit 1bde4ae5f36c8d9abe3a0fce0c6aab3c4a12fe44
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:01:00 2006 +0000
+
+    Second
+    
+    This is the second commit.
+
+diff --git a/dir/sub b/dir/sub
+index 35d242b..8422d40 100644
+--- a/dir/sub
++++ b/dir/sub
+@@ -1,2 +1,4 @@
+ A
+ B
++C
++D
+diff --git a/file0 b/file0
+index 01e79c3..b414108 100644
+--- a/file0
++++ b/file0
+@@ -1,3 +1,6 @@
+ 1
+ 2
+ 3
++4
++5
++6
+diff --git a/file2 b/file2
+deleted file mode 100644
+index 01e79c3..0000000
+--- a/file2
++++ /dev/null
+@@ -1,3 +0,0 @@
+-1
+-2
+-3
+
+commit 444ac553ac7612cc88969031b02b3767fb8a353a
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:00:00 2006 +0000
+
+    Initial
+$
diff --git a/t/t4013/diff.log_--decorate=full_--all b/t/t4013/diff.log_--decorate=full_--all
index 3f9b872..6b0b334 100644
--- a/t/t4013/diff.log_--decorate=full_--all
+++ b/t/t4013/diff.log_--decorate=full_--all
@@ -20,7 +20,7 @@ Date:   Mon Jun 26 00:06:00 2006 +0000
 
     Rearranged lines in dir/sub
 
-commit cbacedd14cb8b89255a2c02b59e77a2e9a8021a0 (refs/notes/commits)
+commit cbacedd14cb8b89255a2c02b59e77a2e9a8021a0
 Author: A U Thor <author@example.com>
 Date:   Mon Jun 26 00:06:00 2006 +0000
 
diff --git a/t/t4013/diff.log_--decorate=full_--clear-decorations_--all b/t/t4013/diff.log_--decorate=full_--clear-decorations_--all
new file mode 100644
index 0000000..1c030a6
--- /dev/null
+++ b/t/t4013/diff.log_--decorate=full_--clear-decorations_--all
@@ -0,0 +1,61 @@
+$ git log --decorate=full --clear-decorations --all
+commit b7e0bc69303b488b47deca799a7d723971dfa6cd (refs/heads/mode)
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:06:00 2006 +0000
+
+    update mode
+
+commit a6f364368ca320bc5a92e18912e16fa6b3dff598 (refs/heads/note)
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:06:00 2006 +0000
+
+    update mode (file2)
+
+Notes:
+    note
+
+commit cd4e72fd96faed3f0ba949dc42967430374e2290 (refs/heads/rearrange)
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:06:00 2006 +0000
+
+    Rearranged lines in dir/sub
+
+commit cbacedd14cb8b89255a2c02b59e77a2e9a8021a0 (refs/notes/commits)
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:06:00 2006 +0000
+
+    Notes added by 'git notes add'
+
+commit 59d314ad6f356dd08601a4cd5e530381da3e3c64 (HEAD -> refs/heads/master)
+Merge: 9a6d494 c7a2ab9
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:04:00 2006 +0000
+
+    Merge branch 'side'
+
+commit c7a2ab9e8eac7b117442a607d5a9b3950ae34d5a (refs/heads/side)
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:03:00 2006 +0000
+
+    Side
+
+commit 9a6d4949b6b76956d9d5e26f2791ec2ceff5fdc0
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:02:00 2006 +0000
+
+    Third
+
+commit 1bde4ae5f36c8d9abe3a0fce0c6aab3c4a12fe44
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:01:00 2006 +0000
+
+    Second
+    
+    This is the second commit.
+
+commit 444ac553ac7612cc88969031b02b3767fb8a353a (refs/heads/initial)
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:00:00 2006 +0000
+
+    Initial
+$
diff --git a/t/t4013/diff.log_--decorate=full_--decorate-all_--all b/t/t4013/diff.log_--decorate=full_--decorate-all_--all
new file mode 100644
index 0000000..d6e7928
--- /dev/null
+++ b/t/t4013/diff.log_--decorate=full_--decorate-all_--all
@@ -0,0 +1,61 @@
+$ git log --decorate=full --decorate-all --all
+commit b7e0bc69303b488b47deca799a7d723971dfa6cd (refs/heads/mode)
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:06:00 2006 +0000
+
+    update mode
+
+commit a6f364368ca320bc5a92e18912e16fa6b3dff598 (refs/heads/note)
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:06:00 2006 +0000
+
+    update mode (file2)
+
+Notes:
+    note
+
+commit cd4e72fd96faed3f0ba949dc42967430374e2290 (refs/heads/rearrange)
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:06:00 2006 +0000
+
+    Rearranged lines in dir/sub
+
+commit cbacedd14cb8b89255a2c02b59e77a2e9a8021a0 (refs/notes/commits)
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:06:00 2006 +0000
+
+    Notes added by 'git notes add'
+
+commit 59d314ad6f356dd08601a4cd5e530381da3e3c64 (HEAD -> refs/heads/master)
+Merge: 9a6d494 c7a2ab9
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:04:00 2006 +0000
+
+    Merge branch 'side'
+
+commit c7a2ab9e8eac7b117442a607d5a9b3950ae34d5a (refs/heads/side)
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:03:00 2006 +0000
+
+    Side
+
+commit 9a6d4949b6b76956d9d5e26f2791ec2ceff5fdc0
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:02:00 2006 +0000
+
+    Third
+
+commit 1bde4ae5f36c8d9abe3a0fce0c6aab3c4a12fe44
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:01:00 2006 +0000
+
+    Second
+    
+    This is the second commit.
+
+commit 444ac553ac7612cc88969031b02b3767fb8a353a (refs/heads/initial)
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:00:00 2006 +0000
+
+    Initial
+$
diff --git a/t/t4013/diff.log_--decorate_--all b/t/t4013/diff.log_--decorate_--all
index f5e20e1..c7df1f5 100644
--- a/t/t4013/diff.log_--decorate_--all
+++ b/t/t4013/diff.log_--decorate_--all
@@ -20,7 +20,7 @@ Date:   Mon Jun 26 00:06:00 2006 +0000
 
     Rearranged lines in dir/sub
 
-commit cbacedd14cb8b89255a2c02b59e77a2e9a8021a0 (refs/notes/commits)
+commit cbacedd14cb8b89255a2c02b59e77a2e9a8021a0
 Author: A U Thor <author@example.com>
 Date:   Mon Jun 26 00:06:00 2006 +0000
 
diff --git a/t/t4013/diff.log_--decorate_--clear-decorations_--all b/t/t4013/diff.log_--decorate_--clear-decorations_--all
new file mode 100644
index 0000000..88be82c
--- /dev/null
+++ b/t/t4013/diff.log_--decorate_--clear-decorations_--all
@@ -0,0 +1,61 @@
+$ git log --decorate --clear-decorations --all
+commit b7e0bc69303b488b47deca799a7d723971dfa6cd (mode)
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:06:00 2006 +0000
+
+    update mode
+
+commit a6f364368ca320bc5a92e18912e16fa6b3dff598 (note)
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:06:00 2006 +0000
+
+    update mode (file2)
+
+Notes:
+    note
+
+commit cd4e72fd96faed3f0ba949dc42967430374e2290 (rearrange)
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:06:00 2006 +0000
+
+    Rearranged lines in dir/sub
+
+commit cbacedd14cb8b89255a2c02b59e77a2e9a8021a0 (refs/notes/commits)
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:06:00 2006 +0000
+
+    Notes added by 'git notes add'
+
+commit 59d314ad6f356dd08601a4cd5e530381da3e3c64 (HEAD -> master)
+Merge: 9a6d494 c7a2ab9
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:04:00 2006 +0000
+
+    Merge branch 'side'
+
+commit c7a2ab9e8eac7b117442a607d5a9b3950ae34d5a (side)
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:03:00 2006 +0000
+
+    Side
+
+commit 9a6d4949b6b76956d9d5e26f2791ec2ceff5fdc0
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:02:00 2006 +0000
+
+    Third
+
+commit 1bde4ae5f36c8d9abe3a0fce0c6aab3c4a12fe44
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:01:00 2006 +0000
+
+    Second
+    
+    This is the second commit.
+
+commit 444ac553ac7612cc88969031b02b3767fb8a353a (initial)
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:00:00 2006 +0000
+
+    Initial
+$
diff --git a/t/t4013/diff.log_--decorate_--decorate-all_--all b/t/t4013/diff.log_--decorate_--decorate-all_--all
new file mode 100644
index 0000000..5d22618
--- /dev/null
+++ b/t/t4013/diff.log_--decorate_--decorate-all_--all
@@ -0,0 +1,61 @@
+$ git log --decorate --decorate-all --all
+commit b7e0bc69303b488b47deca799a7d723971dfa6cd (mode)
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:06:00 2006 +0000
+
+    update mode
+
+commit a6f364368ca320bc5a92e18912e16fa6b3dff598 (note)
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:06:00 2006 +0000
+
+    update mode (file2)
+
+Notes:
+    note
+
+commit cd4e72fd96faed3f0ba949dc42967430374e2290 (rearrange)
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:06:00 2006 +0000
+
+    Rearranged lines in dir/sub
+
+commit cbacedd14cb8b89255a2c02b59e77a2e9a8021a0 (refs/notes/commits)
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:06:00 2006 +0000
+
+    Notes added by 'git notes add'
+
+commit 59d314ad6f356dd08601a4cd5e530381da3e3c64 (HEAD -> master)
+Merge: 9a6d494 c7a2ab9
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:04:00 2006 +0000
+
+    Merge branch 'side'
+
+commit c7a2ab9e8eac7b117442a607d5a9b3950ae34d5a (side)
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:03:00 2006 +0000
+
+    Side
+
+commit 9a6d4949b6b76956d9d5e26f2791ec2ceff5fdc0
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:02:00 2006 +0000
+
+    Third
+
+commit 1bde4ae5f36c8d9abe3a0fce0c6aab3c4a12fe44
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:01:00 2006 +0000
+
+    Second
+    
+    This is the second commit.
+
+commit 444ac553ac7612cc88969031b02b3767fb8a353a (initial)
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:00:00 2006 +0000
+
+    Initial
+$
diff --git a/t/t4013/diff.log_--diff-merges=first-parent_master b/t/t4013/diff.log_--diff-merges=first-parent_master
new file mode 100644
index 0000000..fa63a55
--- /dev/null
+++ b/t/t4013/diff.log_--diff-merges=first-parent_master
@@ -0,0 +1,56 @@
+$ git log --diff-merges=first-parent master
+commit 59d314ad6f356dd08601a4cd5e530381da3e3c64
+Merge: 9a6d494 c7a2ab9
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:04:00 2006 +0000
+
+    Merge branch 'side'
+
+diff --git a/dir/sub b/dir/sub
+index cead32e..992913c 100644
+--- a/dir/sub
++++ b/dir/sub
+@@ -4,3 +4,5 @@ C
+ D
+ E
+ F
++1
++2
+diff --git a/file0 b/file0
+index b414108..10a8a9f 100644
+--- a/file0
++++ b/file0
+@@ -4,3 +4,6 @@
+ 4
+ 5
+ 6
++A
++B
++C
+
+commit c7a2ab9e8eac7b117442a607d5a9b3950ae34d5a
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:03:00 2006 +0000
+
+    Side
+
+commit 9a6d4949b6b76956d9d5e26f2791ec2ceff5fdc0
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:02:00 2006 +0000
+
+    Third
+
+commit 1bde4ae5f36c8d9abe3a0fce0c6aab3c4a12fe44
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:01:00 2006 +0000
+
+    Second
+    
+    This is the second commit.
+
+commit 444ac553ac7612cc88969031b02b3767fb8a353a
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:00:00 2006 +0000
+
+    Initial
+$
diff --git a/t/t4013/diff.log_--diff-merges=off_-p_--first-parent_master b/t/t4013/diff.log_--diff-merges=off_-p_--first-parent_master
new file mode 100644
index 0000000..194e893
--- /dev/null
+++ b/t/t4013/diff.log_--diff-merges=off_-p_--first-parent_master
@@ -0,0 +1,78 @@
+$ git log --diff-merges=off -p --first-parent master
+commit 59d314ad6f356dd08601a4cd5e530381da3e3c64
+Merge: 9a6d494 c7a2ab9
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:04:00 2006 +0000
+
+    Merge branch 'side'
+
+commit 9a6d4949b6b76956d9d5e26f2791ec2ceff5fdc0
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:02:00 2006 +0000
+
+    Third
+
+diff --git a/dir/sub b/dir/sub
+index 8422d40..cead32e 100644
+--- a/dir/sub
++++ b/dir/sub
+@@ -2,3 +2,5 @@ A
+ B
+ C
+ D
++E
++F
+diff --git a/file1 b/file1
+new file mode 100644
+index 0000000..b1e6722
+--- /dev/null
++++ b/file1
+@@ -0,0 +1,3 @@
++A
++B
++C
+
+commit 1bde4ae5f36c8d9abe3a0fce0c6aab3c4a12fe44
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:01:00 2006 +0000
+
+    Second
+    
+    This is the second commit.
+
+diff --git a/dir/sub b/dir/sub
+index 35d242b..8422d40 100644
+--- a/dir/sub
++++ b/dir/sub
+@@ -1,2 +1,4 @@
+ A
+ B
++C
++D
+diff --git a/file0 b/file0
+index 01e79c3..b414108 100644
+--- a/file0
++++ b/file0
+@@ -1,3 +1,6 @@
+ 1
+ 2
+ 3
++4
++5
++6
+diff --git a/file2 b/file2
+deleted file mode 100644
+index 01e79c3..0000000
+--- a/file2
++++ /dev/null
+@@ -1,3 +0,0 @@
+-1
+-2
+-3
+
+commit 444ac553ac7612cc88969031b02b3767fb8a353a
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:00:00 2006 +0000
+
+    Initial
+$
diff --git a/t/t4013/diff.log_--first-parent_--diff-merges=off_-p_master b/t/t4013/diff.log_--first-parent_--diff-merges=off_-p_master
new file mode 100644
index 0000000..5d7461a
--- /dev/null
+++ b/t/t4013/diff.log_--first-parent_--diff-merges=off_-p_master
@@ -0,0 +1,78 @@
+$ git log --first-parent --diff-merges=off -p master
+commit 80e25ffa65bcdbe82ef654b4d06dbbde7945c37f
+Merge: 9a6d494 c7a2ab9
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:04:00 2006 +0000
+
+    Merge branch 'side'
+
+commit 9a6d4949b6b76956d9d5e26f2791ec2ceff5fdc0
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:02:00 2006 +0000
+
+    Third
+
+diff --git a/dir/sub b/dir/sub
+index 8422d40..cead32e 100644
+--- a/dir/sub
++++ b/dir/sub
+@@ -2,3 +2,5 @@ A
+ B
+ C
+ D
++E
++F
+diff --git a/file1 b/file1
+new file mode 100644
+index 0000000..b1e6722
+--- /dev/null
++++ b/file1
+@@ -0,0 +1,3 @@
++A
++B
++C
+
+commit 1bde4ae5f36c8d9abe3a0fce0c6aab3c4a12fe44
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:01:00 2006 +0000
+
+    Second
+    
+    This is the second commit.
+
+diff --git a/dir/sub b/dir/sub
+index 35d242b..8422d40 100644
+--- a/dir/sub
++++ b/dir/sub
+@@ -1,2 +1,4 @@
+ A
+ B
++C
++D
+diff --git a/file0 b/file0
+index 01e79c3..b414108 100644
+--- a/file0
++++ b/file0
+@@ -1,3 +1,6 @@
+ 1
+ 2
+ 3
++4
++5
++6
+diff --git a/file2 b/file2
+deleted file mode 100644
+index 01e79c3..0000000
+--- a/file2
++++ /dev/null
+@@ -1,3 +0,0 @@
+-1
+-2
+-3
+
+commit 444ac553ac7612cc88969031b02b3767fb8a353a
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:00:00 2006 +0000
+
+    Initial
+$
diff --git a/t/t4013/diff.log_--no-diff-merges_-p_--first-parent_master b/t/t4013/diff.log_--no-diff-merges_-p_--first-parent_master
new file mode 100644
index 0000000..5970022
--- /dev/null
+++ b/t/t4013/diff.log_--no-diff-merges_-p_--first-parent_master
@@ -0,0 +1,78 @@
+$ git log --no-diff-merges -p --first-parent master
+commit 59d314ad6f356dd08601a4cd5e530381da3e3c64
+Merge: 9a6d494 c7a2ab9
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:04:00 2006 +0000
+
+    Merge branch 'side'
+
+commit 9a6d4949b6b76956d9d5e26f2791ec2ceff5fdc0
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:02:00 2006 +0000
+
+    Third
+
+diff --git a/dir/sub b/dir/sub
+index 8422d40..cead32e 100644
+--- a/dir/sub
++++ b/dir/sub
+@@ -2,3 +2,5 @@ A
+ B
+ C
+ D
++E
++F
+diff --git a/file1 b/file1
+new file mode 100644
+index 0000000..b1e6722
+--- /dev/null
++++ b/file1
+@@ -0,0 +1,3 @@
++A
++B
++C
+
+commit 1bde4ae5f36c8d9abe3a0fce0c6aab3c4a12fe44
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:01:00 2006 +0000
+
+    Second
+    
+    This is the second commit.
+
+diff --git a/dir/sub b/dir/sub
+index 35d242b..8422d40 100644
+--- a/dir/sub
++++ b/dir/sub
+@@ -1,2 +1,4 @@
+ A
+ B
++C
++D
+diff --git a/file0 b/file0
+index 01e79c3..b414108 100644
+--- a/file0
++++ b/file0
+@@ -1,3 +1,6 @@
+ 1
+ 2
+ 3
++4
++5
++6
+diff --git a/file2 b/file2
+deleted file mode 100644
+index 01e79c3..0000000
+--- a/file2
++++ /dev/null
+@@ -1,3 +0,0 @@
+-1
+-2
+-3
+
+commit 444ac553ac7612cc88969031b02b3767fb8a353a
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:00:00 2006 +0000
+
+    Initial
+$
diff --git a/t/t4013/diff.log_-IA_-IB_-I1_-I2_-p_master b/t/t4013/diff.log_-IA_-IB_-I1_-I2_-p_master
new file mode 100644
index 0000000..929f35a
--- /dev/null
+++ b/t/t4013/diff.log_-IA_-IB_-I1_-I2_-p_master
@@ -0,0 +1,99 @@
+$ git log -IA -IB -I1 -I2 -p master
+commit 59d314ad6f356dd08601a4cd5e530381da3e3c64
+Merge: 9a6d494 c7a2ab9
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:04:00 2006 +0000
+
+    Merge branch 'side'
+
+commit c7a2ab9e8eac7b117442a607d5a9b3950ae34d5a
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:03:00 2006 +0000
+
+    Side
+
+diff --git a/file0 b/file0
+index 01e79c3..f4615da 100644
+--- a/file0
++++ b/file0
+@@ -1,3 +1,6 @@
+ 1
+ 2
+ 3
++A
++B
++C
+diff --git a/file3 b/file3
+new file mode 100644
+index 0000000..7289e35
+
+commit 9a6d4949b6b76956d9d5e26f2791ec2ceff5fdc0
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:02:00 2006 +0000
+
+    Third
+
+diff --git a/dir/sub b/dir/sub
+index 8422d40..cead32e 100644
+--- a/dir/sub
++++ b/dir/sub
+@@ -2,3 +2,5 @@ A
+ B
+ C
+ D
++E
++F
+diff --git a/file1 b/file1
+new file mode 100644
+index 0000000..b1e6722
+--- /dev/null
++++ b/file1
+@@ -0,0 +1,3 @@
++A
++B
++C
+
+commit 1bde4ae5f36c8d9abe3a0fce0c6aab3c4a12fe44
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:01:00 2006 +0000
+
+    Second
+    
+    This is the second commit.
+
+diff --git a/dir/sub b/dir/sub
+index 35d242b..8422d40 100644
+--- a/dir/sub
++++ b/dir/sub
+@@ -1,2 +1,4 @@
+ A
+ B
++C
++D
+diff --git a/file0 b/file0
+index 01e79c3..b414108 100644
+--- a/file0
++++ b/file0
+@@ -1,3 +1,6 @@
+ 1
+ 2
+ 3
++4
++5
++6
+diff --git a/file2 b/file2
+deleted file mode 100644
+index 01e79c3..0000000
+--- a/file2
++++ /dev/null
+@@ -1,3 +0,0 @@
+-1
+-2
+-3
+
+commit 444ac553ac7612cc88969031b02b3767fb8a353a
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:00:00 2006 +0000
+
+    Initial
+$
diff --git a/t/t4013/diff.log_-c_-m_-p_master b/t/t4013/diff.log_-c_-m_-p_master
new file mode 100644
index 0000000..b660f3d
--- /dev/null
+++ b/t/t4013/diff.log_-c_-m_-p_master
@@ -0,0 +1,200 @@
+$ git log -c -m -p master
+commit 59d314ad6f356dd08601a4cd5e530381da3e3c64 (from 9a6d4949b6b76956d9d5e26f2791ec2ceff5fdc0)
+Merge: 9a6d494 c7a2ab9
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:04:00 2006 +0000
+
+    Merge branch 'side'
+
+diff --git a/dir/sub b/dir/sub
+index cead32e..992913c 100644
+--- a/dir/sub
++++ b/dir/sub
+@@ -4,3 +4,5 @@ C
+ D
+ E
+ F
++1
++2
+diff --git a/file0 b/file0
+index b414108..10a8a9f 100644
+--- a/file0
++++ b/file0
+@@ -4,3 +4,6 @@
+ 4
+ 5
+ 6
++A
++B
++C
+
+commit 59d314ad6f356dd08601a4cd5e530381da3e3c64 (from c7a2ab9e8eac7b117442a607d5a9b3950ae34d5a)
+Merge: 9a6d494 c7a2ab9
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:04:00 2006 +0000
+
+    Merge branch 'side'
+
+diff --git a/dir/sub b/dir/sub
+index 7289e35..992913c 100644
+--- a/dir/sub
++++ b/dir/sub
+@@ -1,4 +1,8 @@
+ A
+ B
++C
++D
++E
++F
+ 1
+ 2
+diff --git a/file0 b/file0
+index f4615da..10a8a9f 100644
+--- a/file0
++++ b/file0
+@@ -1,6 +1,9 @@
+ 1
+ 2
+ 3
++4
++5
++6
+ A
+ B
+ C
+diff --git a/file1 b/file1
+new file mode 100644
+index 0000000..b1e6722
+--- /dev/null
++++ b/file1
+@@ -0,0 +1,3 @@
++A
++B
++C
+diff --git a/file2 b/file2
+deleted file mode 100644
+index 01e79c3..0000000
+--- a/file2
++++ /dev/null
+@@ -1,3 +0,0 @@
+-1
+-2
+-3
+diff --git a/file3 b/file3
+deleted file mode 100644
+index 7289e35..0000000
+--- a/file3
++++ /dev/null
+@@ -1,4 +0,0 @@
+-A
+-B
+-1
+-2
+
+commit c7a2ab9e8eac7b117442a607d5a9b3950ae34d5a
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:03:00 2006 +0000
+
+    Side
+
+diff --git a/dir/sub b/dir/sub
+index 35d242b..7289e35 100644
+--- a/dir/sub
++++ b/dir/sub
+@@ -1,2 +1,4 @@
+ A
+ B
++1
++2
+diff --git a/file0 b/file0
+index 01e79c3..f4615da 100644
+--- a/file0
++++ b/file0
+@@ -1,3 +1,6 @@
+ 1
+ 2
+ 3
++A
++B
++C
+diff --git a/file3 b/file3
+new file mode 100644
+index 0000000..7289e35
+--- /dev/null
++++ b/file3
+@@ -0,0 +1,4 @@
++A
++B
++1
++2
+
+commit 9a6d4949b6b76956d9d5e26f2791ec2ceff5fdc0
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:02:00 2006 +0000
+
+    Third
+
+diff --git a/dir/sub b/dir/sub
+index 8422d40..cead32e 100644
+--- a/dir/sub
++++ b/dir/sub
+@@ -2,3 +2,5 @@ A
+ B
+ C
+ D
++E
++F
+diff --git a/file1 b/file1
+new file mode 100644
+index 0000000..b1e6722
+--- /dev/null
++++ b/file1
+@@ -0,0 +1,3 @@
++A
++B
++C
+
+commit 1bde4ae5f36c8d9abe3a0fce0c6aab3c4a12fe44
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:01:00 2006 +0000
+
+    Second
+    
+    This is the second commit.
+
+diff --git a/dir/sub b/dir/sub
+index 35d242b..8422d40 100644
+--- a/dir/sub
++++ b/dir/sub
+@@ -1,2 +1,4 @@
+ A
+ B
++C
++D
+diff --git a/file0 b/file0
+index 01e79c3..b414108 100644
+--- a/file0
++++ b/file0
+@@ -1,3 +1,6 @@
+ 1
+ 2
+ 3
++4
++5
++6
+diff --git a/file2 b/file2
+deleted file mode 100644
+index 01e79c3..0000000
+--- a/file2
++++ /dev/null
+@@ -1,3 +0,0 @@
+-1
+-2
+-3
+
+commit 444ac553ac7612cc88969031b02b3767fb8a353a
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:00:00 2006 +0000
+
+    Initial
+$
diff --git a/t/t4013/diff.log_-m_--raw_master b/t/t4013/diff.log_-m_--raw_master
new file mode 100644
index 0000000..cd2ecc4
--- /dev/null
+++ b/t/t4013/diff.log_-m_--raw_master
@@ -0,0 +1,61 @@
+$ git log -m --raw master
+commit 59d314ad6f356dd08601a4cd5e530381da3e3c64 (from 9a6d4949b6b76956d9d5e26f2791ec2ceff5fdc0)
+Merge: 9a6d494 c7a2ab9
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:04:00 2006 +0000
+
+    Merge branch 'side'
+
+:100644 100644 cead32e... 992913c... M	dir/sub
+:100644 100644 b414108... 10a8a9f... M	file0
+
+commit 59d314ad6f356dd08601a4cd5e530381da3e3c64 (from c7a2ab9e8eac7b117442a607d5a9b3950ae34d5a)
+Merge: 9a6d494 c7a2ab9
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:04:00 2006 +0000
+
+    Merge branch 'side'
+
+:100644 100644 7289e35... 992913c... M	dir/sub
+:100644 100644 f4615da... 10a8a9f... M	file0
+:000000 100644 0000000... b1e6722... A	file1
+:100644 000000 01e79c3... 0000000... D	file2
+:100644 000000 7289e35... 0000000... D	file3
+
+commit c7a2ab9e8eac7b117442a607d5a9b3950ae34d5a
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:03:00 2006 +0000
+
+    Side
+
+:100644 100644 35d242b... 7289e35... M	dir/sub
+:100644 100644 01e79c3... f4615da... M	file0
+:000000 100644 0000000... 7289e35... A	file3
+
+commit 9a6d4949b6b76956d9d5e26f2791ec2ceff5fdc0
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:02:00 2006 +0000
+
+    Third
+
+:100644 100644 8422d40... cead32e... M	dir/sub
+:000000 100644 0000000... b1e6722... A	file1
+
+commit 1bde4ae5f36c8d9abe3a0fce0c6aab3c4a12fe44
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:01:00 2006 +0000
+
+    Second
+    
+    This is the second commit.
+
+:100644 100644 35d242b... 8422d40... M	dir/sub
+:100644 100644 01e79c3... b414108... M	file0
+:100644 000000 01e79c3... 0000000... D	file2
+
+commit 444ac553ac7612cc88969031b02b3767fb8a353a
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:00:00 2006 +0000
+
+    Initial
+$
diff --git a/t/t4013/diff.log_-m_--stat_master b/t/t4013/diff.log_-m_--stat_master
new file mode 100644
index 0000000..c7db084
--- /dev/null
+++ b/t/t4013/diff.log_-m_--stat_master
@@ -0,0 +1,66 @@
+$ git log -m --stat master
+commit 59d314ad6f356dd08601a4cd5e530381da3e3c64 (from 9a6d4949b6b76956d9d5e26f2791ec2ceff5fdc0)
+Merge: 9a6d494 c7a2ab9
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:04:00 2006 +0000
+
+    Merge branch 'side'
+
+ dir/sub | 2 ++
+ file0   | 3 +++
+ 2 files changed, 5 insertions(+)
+
+commit 59d314ad6f356dd08601a4cd5e530381da3e3c64 (from c7a2ab9e8eac7b117442a607d5a9b3950ae34d5a)
+Merge: 9a6d494 c7a2ab9
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:04:00 2006 +0000
+
+    Merge branch 'side'
+
+ dir/sub | 4 ++++
+ file0   | 3 +++
+ file1   | 3 +++
+ file2   | 3 ---
+ file3   | 4 ----
+ 5 files changed, 10 insertions(+), 7 deletions(-)
+
+commit c7a2ab9e8eac7b117442a607d5a9b3950ae34d5a
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:03:00 2006 +0000
+
+    Side
+
+ dir/sub | 2 ++
+ file0   | 3 +++
+ file3   | 4 ++++
+ 3 files changed, 9 insertions(+)
+
+commit 9a6d4949b6b76956d9d5e26f2791ec2ceff5fdc0
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:02:00 2006 +0000
+
+    Third
+
+ dir/sub | 2 ++
+ file1   | 3 +++
+ 2 files changed, 5 insertions(+)
+
+commit 1bde4ae5f36c8d9abe3a0fce0c6aab3c4a12fe44
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:01:00 2006 +0000
+
+    Second
+    
+    This is the second commit.
+
+ dir/sub | 2 ++
+ file0   | 3 +++
+ file2   | 3 ---
+ 3 files changed, 5 insertions(+), 3 deletions(-)
+
+commit 444ac553ac7612cc88969031b02b3767fb8a353a
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:00:00 2006 +0000
+
+    Initial
+$
diff --git a/t/t4013/diff.log_-p_--diff-merges=first-parent_master b/t/t4013/diff.log_-p_--diff-merges=first-parent_master
new file mode 100644
index 0000000..9538a27
--- /dev/null
+++ b/t/t4013/diff.log_-p_--diff-merges=first-parent_master
@@ -0,0 +1,137 @@
+$ git log -p --diff-merges=first-parent master
+commit 59d314ad6f356dd08601a4cd5e530381da3e3c64
+Merge: 9a6d494 c7a2ab9
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:04:00 2006 +0000
+
+    Merge branch 'side'
+
+diff --git a/dir/sub b/dir/sub
+index cead32e..992913c 100644
+--- a/dir/sub
++++ b/dir/sub
+@@ -4,3 +4,5 @@ C
+ D
+ E
+ F
++1
++2
+diff --git a/file0 b/file0
+index b414108..10a8a9f 100644
+--- a/file0
++++ b/file0
+@@ -4,3 +4,6 @@
+ 4
+ 5
+ 6
++A
++B
++C
+
+commit c7a2ab9e8eac7b117442a607d5a9b3950ae34d5a
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:03:00 2006 +0000
+
+    Side
+
+diff --git a/dir/sub b/dir/sub
+index 35d242b..7289e35 100644
+--- a/dir/sub
++++ b/dir/sub
+@@ -1,2 +1,4 @@
+ A
+ B
++1
++2
+diff --git a/file0 b/file0
+index 01e79c3..f4615da 100644
+--- a/file0
++++ b/file0
+@@ -1,3 +1,6 @@
+ 1
+ 2
+ 3
++A
++B
++C
+diff --git a/file3 b/file3
+new file mode 100644
+index 0000000..7289e35
+--- /dev/null
++++ b/file3
+@@ -0,0 +1,4 @@
++A
++B
++1
++2
+
+commit 9a6d4949b6b76956d9d5e26f2791ec2ceff5fdc0
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:02:00 2006 +0000
+
+    Third
+
+diff --git a/dir/sub b/dir/sub
+index 8422d40..cead32e 100644
+--- a/dir/sub
++++ b/dir/sub
+@@ -2,3 +2,5 @@ A
+ B
+ C
+ D
++E
++F
+diff --git a/file1 b/file1
+new file mode 100644
+index 0000000..b1e6722
+--- /dev/null
++++ b/file1
+@@ -0,0 +1,3 @@
++A
++B
++C
+
+commit 1bde4ae5f36c8d9abe3a0fce0c6aab3c4a12fe44
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:01:00 2006 +0000
+
+    Second
+    
+    This is the second commit.
+
+diff --git a/dir/sub b/dir/sub
+index 35d242b..8422d40 100644
+--- a/dir/sub
++++ b/dir/sub
+@@ -1,2 +1,4 @@
+ A
+ B
++C
++D
+diff --git a/file0 b/file0
+index 01e79c3..b414108 100644
+--- a/file0
++++ b/file0
+@@ -1,3 +1,6 @@
+ 1
+ 2
+ 3
++4
++5
++6
+diff --git a/file2 b/file2
+deleted file mode 100644
+index 01e79c3..0000000
+--- a/file2
++++ /dev/null
+@@ -1,3 +0,0 @@
+-1
+-2
+-3
+
+commit 444ac553ac7612cc88969031b02b3767fb8a353a
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:00:00 2006 +0000
+
+    Initial
+$
diff --git a/t/t4013/diff.log_-p_--first-parent_master b/t/t4013/diff.log_-p_--first-parent_master
index 3fc896d..28840eb 100644
--- a/t/t4013/diff.log_-p_--first-parent_master
+++ b/t/t4013/diff.log_-p_--first-parent_master
@@ -6,6 +6,28 @@ Date:   Mon Jun 26 00:04:00 2006 +0000
 
     Merge branch 'side'
 
+diff --git a/dir/sub b/dir/sub
+index cead32e..992913c 100644
+--- a/dir/sub
++++ b/dir/sub
+@@ -4,3 +4,5 @@ C
+ D
+ E
+ F
++1
++2
+diff --git a/file0 b/file0
+index b414108..10a8a9f 100644
+--- a/file0
++++ b/file0
+@@ -4,3 +4,6 @@
+ 4
+ 5
+ 6
++A
++B
++C
+
 commit 9a6d4949b6b76956d9d5e26f2791ec2ceff5fdc0
 Author: A U Thor <author@example.com>
 Date:   Mon Jun 26 00:02:00 2006 +0000
diff --git a/t/t4014-format-patch.sh b/t/t4014-format-patch.sh
index 958c2da..e37a141 100755
--- a/t/t4014-format-patch.sh
+++ b/t/t4014-format-patch.sh
@@ -5,90 +5,97 @@
 
 test_description='various format-patch tests'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-terminal.sh
 
 test_expect_success setup '
-	for i in 1 2 3 4 5 6 7 8 9 10; do echo "$i"; done >file &&
+	test_write_lines 1 2 3 4 5 6 7 8 9 10 >file &&
 	cat file >elif &&
 	git add file elif &&
 	test_tick &&
 	git commit -m Initial &&
 	git checkout -b side &&
 
-	for i in 1 2 5 6 A B C 7 8 9 10; do echo "$i"; done >file &&
+	test_write_lines 1 2 5 6 A B C 7 8 9 10 >file &&
 	test_chmod +x elif &&
 	test_tick &&
 	git commit -m "Side changes #1" &&
 
-	for i in D E F; do echo "$i"; done >>file &&
+	test_write_lines D E F >>file &&
 	git update-index file &&
 	test_tick &&
 	git commit -m "Side changes #2" &&
 	git tag C2 &&
 
-	for i in 5 6 1 2 3 A 4 B C 7 8 9 10 D E F; do echo "$i"; done >file &&
+	test_write_lines 5 6 1 2 3 A 4 B C 7 8 9 10 D E F >file &&
 	git update-index file &&
 	test_tick &&
 	git commit -m "Side changes #3 with \\n backslash-n in it." &&
 
-	git checkout master &&
+	git checkout main &&
 	git diff-tree -p C2 >patch &&
 	git apply --index <patch &&
 	test_tick &&
-	git commit -m "Master accepts moral equivalent of #2" &&
+	git commit -m "Main accepts moral equivalent of #2" &&
 
 	git checkout side &&
 	git checkout -b patchid &&
-	for i in 5 6 1 2 3 A 4 B C 7 8 9 10 D E F; do echo "$i"; done >file2 &&
-	for i in 1 2 3 A 4 B C 7 8 9 10 D E F 5 6; do echo "$i"; done >file3 &&
-	for i in 8 9 10; do echo "$i"; done >file &&
+	test_write_lines 5 6 1 2 3 A 4 B C 7 8 9 10 D E F >file2 &&
+	test_write_lines 1 2 3 A 4 B C 7 8 9 10 D E F 5 6 >file3 &&
+	test_write_lines 8 9 10 >file &&
 	git add file file2 file3 &&
 	test_tick &&
 	git commit -m "patchid 1" &&
-	for i in 4 A B 7 8 9 10; do echo "$i"; done >file2 &&
-	for i in 8 9 10 5 6; do echo "$i"; done >file3 &&
+	test_write_lines 4 A B 7 8 9 10 >file2 &&
+	test_write_lines 8 9 10 5 6 >file3 &&
 	git add file2 file3 &&
 	test_tick &&
 	git commit -m "patchid 2" &&
-	for i in 10 5 6; do echo "$i"; done >file &&
+	test_write_lines 10 5 6 >file &&
 	git add file &&
 	test_tick &&
 	git commit -m "patchid 3" &&
 
-	git checkout master
+	git checkout -b empty main &&
+	test_tick &&
+	git commit --allow-empty -m "empty commit" &&
+
+	git checkout main
 '
 
 test_expect_success 'format-patch --ignore-if-in-upstream' '
-	git format-patch --stdout master..side >patch0 &&
+	git format-patch --stdout main..side >patch0 &&
 	grep "^From " patch0 >from0 &&
 	test_line_count = 3 from0
 '
 
 test_expect_success 'format-patch --ignore-if-in-upstream' '
 	git format-patch --stdout \
-		--ignore-if-in-upstream master..side >patch1 &&
+		--ignore-if-in-upstream main..side >patch1 &&
 	grep "^From " patch1 >from1 &&
 	test_line_count = 2 from1
 '
 
 test_expect_success 'format-patch --ignore-if-in-upstream handles tags' '
 	git tag -a v1 -m tag side &&
-	git tag -a v2 -m tag master &&
+	git tag -a v2 -m tag main &&
 	git format-patch --stdout --ignore-if-in-upstream v2..v1 >patch1 &&
 	grep "^From " patch1 >from1 &&
 	test_line_count = 2 from1
 '
 
 test_expect_success "format-patch doesn't consider merge commits" '
-	git checkout -b feature master &&
+	git checkout -b feature main &&
 	echo "Another line" >>file &&
 	test_tick &&
 	git commit -am "Feature branch change #1" &&
 	echo "Yet another line" >>file &&
 	test_tick &&
 	git commit -am "Feature branch change #2" &&
-	git checkout -b merger master &&
+	git checkout -b merger main &&
 	test_tick &&
 	git merge --no-ff feature &&
 	git format-patch -3 --stdout >patch &&
@@ -97,16 +104,16 @@ test_expect_success "format-patch doesn't consider merge commits" '
 '
 
 test_expect_success 'format-patch result applies' '
-	git checkout -b rebuild-0 master &&
+	git checkout -b rebuild-0 main &&
 	git am -3 patch0 &&
-	git rev-list master.. >list &&
+	git rev-list main.. >list &&
 	test_line_count = 2 list
 '
 
 test_expect_success 'format-patch --ignore-if-in-upstream result applies' '
-	git checkout -b rebuild-1 master &&
+	git checkout -b rebuild-1 main &&
 	git am -3 patch1 &&
-	git rev-list master.. >list &&
+	git rev-list main.. >list &&
 	test_line_count = 2 list
 '
 
@@ -125,12 +132,18 @@ test_expect_success 'replay did not screw up the log message' '
 	grep "^Side .* with .* backslash-n" actual
 '
 
+test_expect_success 'format-patch empty commit' '
+	git format-patch --stdout main..empty >empty &&
+	grep "^From " empty >from &&
+	test_line_count = 1 from
+'
+
 test_expect_success 'extra headers' '
 	git config format.headers "To: R E Cipient <rcipient@example.com>
 " &&
 	git config --add format.headers "Cc: S E Cipient <scipient@example.com>
 " &&
-	git format-patch --stdout master..side >patch2 &&
+	git format-patch --stdout main..side >patch2 &&
 	sed -e "/^\$/q" patch2 >hdrs2 &&
 	grep "^To: R E Cipient <rcipient@example.com>\$" hdrs2 &&
 	grep "^Cc: S E Cipient <scipient@example.com>\$" hdrs2
@@ -139,7 +152,7 @@ test_expect_success 'extra headers' '
 test_expect_success 'extra headers without newlines' '
 	git config --replace-all format.headers "To: R E Cipient <rcipient@example.com>" &&
 	git config --add format.headers "Cc: S E Cipient <scipient@example.com>" &&
-	git format-patch --stdout master..side >patch3 &&
+	git format-patch --stdout main..side >patch3 &&
 	sed -e "/^\$/q" patch3 >hdrs3 &&
 	grep "^To: R E Cipient <rcipient@example.com>\$" hdrs3 &&
 	grep "^Cc: S E Cipient <scipient@example.com>\$" hdrs3
@@ -148,7 +161,7 @@ test_expect_success 'extra headers without newlines' '
 test_expect_success 'extra headers with multiple To:s' '
 	git config --replace-all format.headers "To: R E Cipient <rcipient@example.com>" &&
 	git config --add format.headers "To: S E Cipient <scipient@example.com>" &&
-	git format-patch --stdout master..side >patch4 &&
+	git format-patch --stdout main..side >patch4 &&
 	sed -e "/^\$/q" patch4 >hdrs4 &&
 	grep "^To: R E Cipient <rcipient@example.com>,\$" hdrs4 &&
 	grep "^ *S E Cipient <scipient@example.com>\$" hdrs4
@@ -156,7 +169,7 @@ test_expect_success 'extra headers with multiple To:s' '
 
 test_expect_success 'additional command line cc (ascii)' '
 	git config --replace-all format.headers "Cc: R E Cipient <rcipient@example.com>" &&
-	git format-patch --cc="S E Cipient <scipient@example.com>" --stdout master..side >patch5 &&
+	git format-patch --cc="S E Cipient <scipient@example.com>" --stdout main..side >patch5 &&
 	sed -e "/^\$/q" patch5 >hdrs5 &&
 	grep "^Cc: R E Cipient <rcipient@example.com>,\$" hdrs5 &&
 	grep "^ *S E Cipient <scipient@example.com>\$" hdrs5
@@ -164,7 +177,7 @@ test_expect_success 'additional command line cc (ascii)' '
 
 test_expect_failure 'additional command line cc (rfc822)' '
 	git config --replace-all format.headers "Cc: R E Cipient <rcipient@example.com>" &&
-	git format-patch --cc="S. E. Cipient <scipient@example.com>" --stdout master..side >patch5 &&
+	git format-patch --cc="S. E. Cipient <scipient@example.com>" --stdout main..side >patch5 &&
 	sed -e "/^\$/q" patch5 >hdrs5 &&
 	grep "^Cc: R E Cipient <rcipient@example.com>,\$" hdrs5 &&
 	grep "^ *\"S. E. Cipient\" <scipient@example.com>\$" hdrs5
@@ -172,14 +185,14 @@ test_expect_failure 'additional command line cc (rfc822)' '
 
 test_expect_success 'command line headers' '
 	git config --unset-all format.headers &&
-	git format-patch --add-header="Cc: R E Cipient <rcipient@example.com>" --stdout master..side >patch6 &&
+	git format-patch --add-header="Cc: R E Cipient <rcipient@example.com>" --stdout main..side >patch6 &&
 	sed -e "/^\$/q" patch6 >hdrs6 &&
 	grep "^Cc: R E Cipient <rcipient@example.com>\$" hdrs6
 '
 
 test_expect_success 'configuration headers and command line headers' '
 	git config --replace-all format.headers "Cc: R E Cipient <rcipient@example.com>" &&
-	git format-patch --add-header="Cc: S E Cipient <scipient@example.com>" --stdout master..side >patch7 &&
+	git format-patch --add-header="Cc: S E Cipient <scipient@example.com>" --stdout main..side >patch7 &&
 	sed -e "/^\$/q" patch7 >hdrs7 &&
 	grep "^Cc: R E Cipient <rcipient@example.com>,\$" hdrs7 &&
 	grep "^ *S E Cipient <scipient@example.com>\$" hdrs7
@@ -187,40 +200,40 @@ test_expect_success 'configuration headers and command line headers' '
 
 test_expect_success 'command line To: header (ascii)' '
 	git config --unset-all format.headers &&
-	git format-patch --to="R E Cipient <rcipient@example.com>" --stdout master..side >patch8 &&
+	git format-patch --to="R E Cipient <rcipient@example.com>" --stdout main..side >patch8 &&
 	sed -e "/^\$/q" patch8 >hdrs8 &&
 	grep "^To: R E Cipient <rcipient@example.com>\$" hdrs8
 '
 
 test_expect_failure 'command line To: header (rfc822)' '
-	git format-patch --to="R. E. Cipient <rcipient@example.com>" --stdout master..side >patch8 &&
+	git format-patch --to="R. E. Cipient <rcipient@example.com>" --stdout main..side >patch8 &&
 	sed -e "/^\$/q" patch8 >hdrs8 &&
 	grep "^To: \"R. E. Cipient\" <rcipient@example.com>\$" hdrs8
 '
 
 test_expect_failure 'command line To: header (rfc2047)' '
-	git format-patch --to="R Ä Cipient <rcipient@example.com>" --stdout master..side >patch8 &&
+	git format-patch --to="R Ä Cipient <rcipient@example.com>" --stdout main..side >patch8 &&
 	sed -e "/^\$/q" patch8 >hdrs8 &&
 	grep "^To: =?UTF-8?q?R=20=C3=84=20Cipient?= <rcipient@example.com>\$" hdrs8
 '
 
 test_expect_success 'configuration To: header (ascii)' '
 	git config format.to "R E Cipient <rcipient@example.com>" &&
-	git format-patch --stdout master..side >patch9 &&
+	git format-patch --stdout main..side >patch9 &&
 	sed -e "/^\$/q" patch9 >hdrs9 &&
 	grep "^To: R E Cipient <rcipient@example.com>\$" hdrs9
 '
 
 test_expect_failure 'configuration To: header (rfc822)' '
 	git config format.to "R. E. Cipient <rcipient@example.com>" &&
-	git format-patch --stdout master..side >patch9 &&
+	git format-patch --stdout main..side >patch9 &&
 	sed -e "/^\$/q" patch9 >hdrs9 &&
 	grep "^To: \"R. E. Cipient\" <rcipient@example.com>\$" hdrs9
 '
 
 test_expect_failure 'configuration To: header (rfc2047)' '
 	git config format.to "R Ä Cipient <rcipient@example.com>" &&
-	git format-patch --stdout master..side >patch9 &&
+	git format-patch --stdout main..side >patch9 &&
 	sed -e "/^\$/q" patch9 >hdrs9 &&
 	grep "^To: =?UTF-8?q?R=20=C3=84=20Cipient?= <rcipient@example.com>\$" hdrs9
 '
@@ -234,35 +247,35 @@ check_patch () {
 }
 
 test_expect_success 'format.from=false' '
-	git -c format.from=false format-patch --stdout master..side >patch &&
+	git -c format.from=false format-patch --stdout main..side >patch &&
 	sed -e "/^\$/q" patch >hdrs &&
 	check_patch patch &&
 	! grep "^From: C O Mitter <committer@example.com>\$" hdrs
 '
 
 test_expect_success 'format.from=true' '
-	git -c format.from=true format-patch --stdout master..side >patch &&
+	git -c format.from=true format-patch --stdout main..side >patch &&
 	sed -e "/^\$/q" patch >hdrs &&
 	check_patch hdrs &&
 	grep "^From: C O Mitter <committer@example.com>\$" hdrs
 '
 
 test_expect_success 'format.from with address' '
-	git -c format.from="F R Om <from@example.com>" format-patch --stdout master..side >patch &&
+	git -c format.from="F R Om <from@example.com>" format-patch --stdout main..side >patch &&
 	sed -e "/^\$/q" patch >hdrs &&
 	check_patch hdrs &&
 	grep "^From: F R Om <from@example.com>\$" hdrs
 '
 
 test_expect_success '--no-from overrides format.from' '
-	git -c format.from="F R Om <from@example.com>" format-patch --no-from --stdout master..side >patch &&
+	git -c format.from="F R Om <from@example.com>" format-patch --no-from --stdout main..side >patch &&
 	sed -e "/^\$/q" patch >hdrs &&
 	check_patch hdrs &&
 	! grep "^From: F R Om <from@example.com>\$" hdrs
 '
 
 test_expect_success '--from overrides format.from' '
-	git -c format.from="F R Om <from@example.com>" format-patch --from --stdout master..side >patch &&
+	git -c format.from="F R Om <from@example.com>" format-patch --from --stdout main..side >patch &&
 	sed -e "/^\$/q" patch >hdrs &&
 	check_patch hdrs &&
 	! grep "^From: F R Om <from@example.com>\$" hdrs
@@ -271,7 +284,7 @@ test_expect_success '--from overrides format.from' '
 test_expect_success '--no-to overrides config.to' '
 	git config --replace-all format.to \
 		"R E Cipient <rcipient@example.com>" &&
-	git format-patch --no-to --stdout master..side >patch10 &&
+	git format-patch --no-to --stdout main..side >patch10 &&
 	sed -e "/^\$/q" patch10 >hdrs10 &&
 	check_patch hdrs10 &&
 	! grep "^To: R E Cipient <rcipient@example.com>\$" hdrs10
@@ -281,7 +294,7 @@ test_expect_success '--no-to and --to replaces config.to' '
 	git config --replace-all format.to \
 		"Someone <someone@out.there>" &&
 	git format-patch --no-to --to="Someone Else <else@out.there>" \
-		--stdout master..side >patch11 &&
+		--stdout main..side >patch11 &&
 	sed -e "/^\$/q" patch11 >hdrs11 &&
 	check_patch hdrs11 &&
 	! grep "^To: Someone <someone@out.there>\$" hdrs11 &&
@@ -291,7 +304,7 @@ test_expect_success '--no-to and --to replaces config.to' '
 test_expect_success '--no-cc overrides config.cc' '
 	git config --replace-all format.cc \
 		"C E Cipient <rcipient@example.com>" &&
-	git format-patch --no-cc --stdout master..side >patch12 &&
+	git format-patch --no-cc --stdout main..side >patch12 &&
 	sed -e "/^\$/q" patch12 >hdrs12 &&
 	check_patch hdrs12 &&
 	! grep "^Cc: C E Cipient <rcipient@example.com>\$" hdrs12
@@ -300,7 +313,7 @@ test_expect_success '--no-cc overrides config.cc' '
 test_expect_success '--no-add-header overrides config.headers' '
 	git config --replace-all format.headers \
 		"Header1: B E Cipient <rcipient@example.com>" &&
-	git format-patch --no-add-header --stdout master..side >patch13 &&
+	git format-patch --no-add-header --stdout main..side >patch13 &&
 	sed -e "/^\$/q" patch13 >hdrs13 &&
 	check_patch hdrs13 &&
 	! grep "^Header1: B E Cipient <rcipient@example.com>\$" hdrs13
@@ -309,13 +322,67 @@ test_expect_success '--no-add-header overrides config.headers' '
 test_expect_success 'multiple files' '
 	rm -rf patches/ &&
 	git checkout side &&
-	git format-patch -o patches/ master &&
+	git format-patch -o patches/ main &&
 	ls patches/0001-Side-changes-1.patch patches/0002-Side-changes-2.patch patches/0003-Side-changes-3-with-n-backslash-n-in-it.patch
 '
 
+test_expect_success 'filename length limit' '
+	test_when_finished "rm -f 000*" &&
+	rm -rf 000[1-9]-*.patch &&
+	for len in 15 25 35
+	do
+		git format-patch --filename-max-length=$len -3 side &&
+		max=$(
+			for patch in 000[1-9]-*.patch
+			do
+				echo "$patch" | wc -c || exit 1
+			done |
+			sort -nr |
+			head -n 1
+		) &&
+		test $max -le $len || return 1
+	done
+'
+
+test_expect_success 'filename length limit from config' '
+	test_when_finished "rm -f 000*" &&
+	rm -rf 000[1-9]-*.patch &&
+	for len in 15 25 35
+	do
+		git -c format.filenameMaxLength=$len format-patch -3 side &&
+		max=$(
+			for patch in 000[1-9]-*.patch
+			do
+				echo "$patch" | wc -c || exit 1
+			done |
+			sort -nr |
+			head -n 1
+		) &&
+		test $max -le $len || return 1
+	done
+'
+
+test_expect_success 'filename limit applies only to basename' '
+	test_when_finished "rm -rf patches/" &&
+	rm -rf patches/ &&
+	for len in 15 25 35
+	do
+		git format-patch -o patches --filename-max-length=$len -3 side &&
+		max=$(
+			for patch in patches/000[1-9]-*.patch
+			do
+				echo "${patch#patches/}" | wc -c || exit 1
+			done |
+			sort -nr |
+			head -n 1
+		) &&
+		test $max -le $len || return 1
+	done
+'
+
 test_expect_success 'reroll count' '
 	rm -fr patches &&
-	git format-patch -o patches --cover-letter --reroll-count 4 master..side >list &&
+	git format-patch -o patches --cover-letter --reroll-count 4 main..side >list &&
 	! grep -v "^patches/v4-000[0-3]-" list &&
 	sed -n -e "/^Subject: /p" $(cat list) >subjects &&
 	! grep -v "^Subject: \[PATCH v4 [0-3]/3\] " subjects
@@ -323,12 +390,36 @@ test_expect_success 'reroll count' '
 
 test_expect_success 'reroll count (-v)' '
 	rm -fr patches &&
-	git format-patch -o patches --cover-letter -v4 master..side >list &&
+	git format-patch -o patches --cover-letter -v4 main..side >list &&
 	! grep -v "^patches/v4-000[0-3]-" list &&
 	sed -n -e "/^Subject: /p" $(cat list) >subjects &&
 	! grep -v "^Subject: \[PATCH v4 [0-3]/3\] " subjects
 '
 
+test_expect_success 'reroll count (-v) with a fractional number' '
+	rm -fr patches &&
+	git format-patch -o patches --cover-letter -v4.4 main..side >list &&
+	! grep -v "^patches/v4.4-000[0-3]-" list &&
+	sed -n -e "/^Subject: /p" $(cat list) >subjects &&
+	! grep -v "^Subject: \[PATCH v4.4 [0-3]/3\] " subjects
+'
+
+test_expect_success 'reroll (-v) count with a non number' '
+	rm -fr patches &&
+	git format-patch -o patches --cover-letter -v4rev2 main..side >list &&
+	! grep -v "^patches/v4rev2-000[0-3]-" list &&
+	sed -n -e "/^Subject: /p" $(cat list) >subjects &&
+	! grep -v "^Subject: \[PATCH v4rev2 [0-3]/3\] " subjects
+'
+
+test_expect_success 'reroll (-v) count with a non-pathname character' '
+	rm -fr patches &&
+	git format-patch -o patches --cover-letter -v4---..././../--1/.2//  main..side >list &&
+	! grep -v "patches/v4-\.-\.-\.-1-\.2-000[0-3]-" list &&
+	sed -n -e "/^Subject: /p" $(cat list) >subjects &&
+	! grep -v "^Subject: \[PATCH v4---\.\.\./\./\.\./--1/\.2// [0-3]/3\] " subjects
+'
+
 check_threading () {
 	expect="$1" &&
 	shift &&
@@ -359,84 +450,89 @@ EOF
 
 test_expect_success 'no threading' '
 	git checkout side &&
-	check_threading expect.no-threading master
+	check_threading expect.no-threading main
 '
 
 cat >expect.thread <<EOF
 ---
-Message-Id: <0>
+Message-ID: <0>
 ---
-Message-Id: <1>
+Message-ID: <1>
 In-Reply-To: <0>
 References: <0>
 ---
-Message-Id: <2>
+Message-ID: <2>
 In-Reply-To: <0>
 References: <0>
 EOF
 
 test_expect_success 'thread' '
-	check_threading expect.thread --thread master
+	check_threading expect.thread --thread main
+'
+
+test_expect_success '--thread overrides format.thread=deep' '
+	test_config format.thread deep &&
+	check_threading expect.thread --thread main
 '
 
 cat >expect.in-reply-to <<EOF
 ---
-Message-Id: <0>
+Message-ID: <0>
 In-Reply-To: <1>
 References: <1>
 ---
-Message-Id: <2>
+Message-ID: <2>
 In-Reply-To: <1>
 References: <1>
 ---
-Message-Id: <3>
+Message-ID: <3>
 In-Reply-To: <1>
 References: <1>
 EOF
 
 test_expect_success 'thread in-reply-to' '
 	check_threading expect.in-reply-to --in-reply-to="<test.message>" \
-		--thread master
+		--thread main
 '
 
 cat >expect.cover-letter <<EOF
 ---
-Message-Id: <0>
+Message-ID: <0>
 ---
-Message-Id: <1>
+Message-ID: <1>
 In-Reply-To: <0>
 References: <0>
 ---
-Message-Id: <2>
+Message-ID: <2>
 In-Reply-To: <0>
 References: <0>
 ---
-Message-Id: <3>
+Message-ID: <3>
 In-Reply-To: <0>
 References: <0>
 EOF
 
 test_expect_success 'thread cover-letter' '
-	check_threading expect.cover-letter --cover-letter --thread master
+	check_threading expect.cover-letter --cover-letter --thread main
 '
 
 cat >expect.cl-irt <<EOF
 ---
-Message-Id: <0>
+Message-ID: <0>
 In-Reply-To: <1>
 References: <1>
 ---
-Message-Id: <2>
+Message-ID: <2>
 In-Reply-To: <0>
 References: <1>
 	<0>
 ---
-Message-Id: <3>
+Message-ID: <3>
 In-Reply-To: <0>
 References: <1>
 	<0>
 ---
-Message-Id: <4>
+Message-ID: <4>
 In-Reply-To: <0>
 References: <1>
 	<0>
@@ -444,44 +540,44 @@ EOF
 
 test_expect_success 'thread cover-letter in-reply-to' '
 	check_threading expect.cl-irt --cover-letter \
-		--in-reply-to="<test.message>" --thread master
+		--in-reply-to="<test.message>" --thread main
 '
 
 test_expect_success 'thread explicit shallow' '
 	check_threading expect.cl-irt --cover-letter \
-		--in-reply-to="<test.message>" --thread=shallow master
+		--in-reply-to="<test.message>" --thread=shallow main
 '
 
 cat >expect.deep <<EOF
 ---
-Message-Id: <0>
+Message-ID: <0>
 ---
-Message-Id: <1>
+Message-ID: <1>
 In-Reply-To: <0>
 References: <0>
 ---
-Message-Id: <2>
+Message-ID: <2>
 In-Reply-To: <1>
 References: <0>
 	<1>
 EOF
 
 test_expect_success 'thread deep' '
-	check_threading expect.deep --thread=deep master
+	check_threading expect.deep --thread=deep main
 '
 
 cat >expect.deep-irt <<EOF
 ---
-Message-Id: <0>
+Message-ID: <0>
 In-Reply-To: <1>
 References: <1>
 ---
-Message-Id: <2>
+Message-ID: <2>
 In-Reply-To: <0>
 References: <1>
 	<0>
 ---
-Message-Id: <3>
+Message-ID: <3>
 In-Reply-To: <2>
 References: <1>
 	<0>
@@ -490,23 +586,23 @@ EOF
 
 test_expect_success 'thread deep in-reply-to' '
 	check_threading expect.deep-irt  --thread=deep \
-		--in-reply-to="<test.message>" master
+		--in-reply-to="<test.message>" main
 '
 
 cat >expect.deep-cl <<EOF
 ---
-Message-Id: <0>
+Message-ID: <0>
 ---
-Message-Id: <1>
+Message-ID: <1>
 In-Reply-To: <0>
 References: <0>
 ---
-Message-Id: <2>
+Message-ID: <2>
 In-Reply-To: <1>
 References: <0>
 	<1>
 ---
-Message-Id: <3>
+Message-ID: <3>
 In-Reply-To: <2>
 References: <0>
 	<1>
@@ -514,27 +610,27 @@ References: <0>
 EOF
 
 test_expect_success 'thread deep cover-letter' '
-	check_threading expect.deep-cl --cover-letter --thread=deep master
+	check_threading expect.deep-cl --cover-letter --thread=deep main
 '
 
 cat >expect.deep-cl-irt <<EOF
 ---
-Message-Id: <0>
+Message-ID: <0>
 In-Reply-To: <1>
 References: <1>
 ---
-Message-Id: <2>
+Message-ID: <2>
 In-Reply-To: <0>
 References: <1>
 	<0>
 ---
-Message-Id: <3>
+Message-ID: <3>
 In-Reply-To: <2>
 References: <1>
 	<0>
 	<2>
 ---
-Message-Id: <4>
+Message-ID: <4>
 In-Reply-To: <3>
 References: <1>
 	<0>
@@ -544,27 +640,27 @@ EOF
 
 test_expect_success 'thread deep cover-letter in-reply-to' '
 	check_threading expect.deep-cl-irt --cover-letter \
-		--in-reply-to="<test.message>" --thread=deep master
+		--in-reply-to="<test.message>" --thread=deep main
 '
 
 test_expect_success 'thread via config' '
 	test_config format.thread true &&
-	check_threading expect.thread master
+	check_threading expect.thread main
 '
 
 test_expect_success 'thread deep via config' '
 	test_config format.thread deep &&
-	check_threading expect.deep master
+	check_threading expect.deep main
 '
 
 test_expect_success 'thread config + override' '
 	test_config format.thread deep &&
-	check_threading expect.thread --thread master
+	check_threading expect.thread --thread main
 '
 
 test_expect_success 'thread config + --no-thread' '
 	test_config format.thread deep &&
-	check_threading expect.no-threading --no-thread master
+	check_threading expect.no-threading --no-thread main
 '
 
 test_expect_success 'excessive subject' '
@@ -572,12 +668,12 @@ test_expect_success 'excessive subject' '
 	git checkout side &&
 	before=$(git hash-object file) &&
 	before=$(git rev-parse --short $before) &&
-	for i in 5 6 1 2 3 A 4 B C 7 8 9 10 D E F; do echo "$i"; done >>file &&
+	test_write_lines 5 6 1 2 3 A 4 B C 7 8 9 10 D E F >>file &&
 	after=$(git hash-object file) &&
 	after=$(git rev-parse --short $after) &&
 	git update-index file &&
 	git commit -m "This is an excessively long subject line for a message due to the habit some projects have of not having a short, one-line subject at the start of the commit message, but rather sticking a whole paragraph right at the start as the only thing in the commit message. It had better not become the filename for the patch." &&
-	git format-patch -o patches/ master..side &&
+	git format-patch -o patches/ main..side &&
 	ls patches/0004-This-is-an-excessively-long-subject-line-for-a-messa.patch
 '
 
@@ -831,25 +927,54 @@ echo "fatal: --check does not make sense" >expect.check
 
 test_expect_success 'options no longer allowed for format-patch' '
 	test_must_fail git format-patch --name-only 2>output &&
-	test_i18ncmp expect.name-only output &&
+	test_cmp expect.name-only output &&
 	test_must_fail git format-patch --name-status 2>output &&
-	test_i18ncmp expect.name-status output &&
+	test_cmp expect.name-status output &&
 	test_must_fail git format-patch --check 2>output &&
-	test_i18ncmp expect.check output
+	test_cmp expect.check output
 '
 
 test_expect_success 'format-patch --numstat should produce a patch' '
-	git format-patch --numstat --stdout master..side >output &&
+	git format-patch --numstat --stdout main..side >output &&
 	grep "^diff --git a/" output >diff &&
 	test_line_count = 5 diff
 '
 
 test_expect_success 'format-patch -- <path>' '
-	git format-patch master..side -- file 2>error &&
-	! grep "Use .--" error
+	rm -f *.patch &&
+	git checkout -b pathspec main &&
+
+	echo file_a 1 >file_a &&
+	echo file_b 1 >file_b &&
+	git add file_a file_b &&
+	git commit -m pathspec_initial &&
+
+	echo file_a 2 >>file_a &&
+	git add file_a &&
+	git commit -m pathspec_a &&
+
+	echo file_b 2 >>file_b &&
+	git add file_b &&
+	git commit -m pathspec_b &&
+
+	echo file_a 3 >>file_a &&
+	echo file_b 3 >>file_b &&
+	git add file_a file_b &&
+	git commit -m pathspec_ab &&
+
+	cat >expect <<-\EOF &&
+	0001-pathspec_initial.patch
+	0002-pathspec_a.patch
+	0003-pathspec_ab.patch
+	EOF
+
+	git format-patch main..pathspec -- file_a >output &&
+	test_cmp expect output &&
+	! grep file_b *.patch
 '
 
 test_expect_success 'format-patch --ignore-if-in-upstream HEAD' '
+	git checkout side &&
 	git format-patch --ignore-if-in-upstream HEAD
 '
 
@@ -1005,7 +1130,7 @@ test_expect_success TTY 'format-patch --stdout paginates' '
 test_expect_success 'format-patch handles multi-line subjects' '
 	rm -rf patches/ &&
 	echo content >>file &&
-	for i in one two three; do echo $i; done >msg &&
+	test_write_lines one two three >msg &&
 	git add file &&
 	git commit -F msg &&
 	git format-patch -o patches -1 &&
@@ -1017,7 +1142,7 @@ test_expect_success 'format-patch handles multi-line subjects' '
 test_expect_success 'format-patch handles multi-line encoded subjects' '
 	rm -rf patches/ &&
 	echo content >>file &&
-	for i in en två tre; do echo $i; done >msg &&
+	test_write_lines en två tre >msg &&
 	git add file &&
 	git commit -F msg &&
 	git format-patch -o patches -1 &&
@@ -1248,7 +1373,27 @@ test_expect_success '--rfc' '
 	Subject: [RFC PATCH 1/1] header with . in it
 	EOF
 	git format-patch -n -1 --stdout --rfc >patch &&
-	grep ^Subject: patch >actual &&
+	grep "^Subject:" patch >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success '--rfc does not overwrite prefix' '
+	cat >expect <<-\EOF &&
+	Subject: [RFC PATCH foobar 1/1] header with . in it
+	EOF
+	git -c format.subjectPrefix="PATCH foobar" \
+		format-patch -n -1 --stdout --rfc >patch &&
+	grep "^Subject:" patch >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success '--rfc is argument order independent' '
+	cat >expect <<-\EOF &&
+	Subject: [RFC PATCH foobar 1/1] header with . in it
+	EOF
+	git format-patch -n -1 --stdout --rfc \
+		--subject-prefix="PATCH foobar" >patch &&
+	grep "^Subject:" patch >actual &&
 	test_cmp expect actual
 '
 
@@ -1290,6 +1435,43 @@ test_expect_success '--from omits redundant in-body header' '
 	test_cmp expect patch.head
 '
 
+test_expect_success 'with --force-in-body-from, redundant in-body from is kept' '
+	git format-patch --force-in-body-from \
+		-1 --stdout --from="A U Thor <author@example.com>" >patch &&
+	cat >expect <<-\EOF &&
+	From: A U Thor <author@example.com>
+
+	From: A U Thor <author@example.com>
+
+	EOF
+	sed -ne "/^From:/p; /^$/p; /^---$/q" patch >patch.head &&
+	test_cmp expect patch.head
+'
+
+test_expect_success 'format.forceInBodyFrom, equivalent to --force-in-body-from' '
+	git -c format.forceInBodyFrom=yes format-patch \
+		-1 --stdout --from="A U Thor <author@example.com>" >patch &&
+	cat >expect <<-\EOF &&
+	From: A U Thor <author@example.com>
+
+	From: A U Thor <author@example.com>
+
+	EOF
+	sed -ne "/^From:/p; /^$/p; /^---$/q" patch >patch.head &&
+	test_cmp expect patch.head
+'
+
+test_expect_success 'format.forceInBodyFrom, equivalent to --force-in-body-from' '
+	git -c format.forceInBodyFrom=yes format-patch --no-force-in-body-from \
+		-1 --stdout --from="A U Thor <author@example.com>" >patch &&
+	cat >expect <<-\EOF &&
+	From: A U Thor <author@example.com>
+
+	EOF
+	sed -ne "/^From:/p; /^$/p; /^---$/q" patch >patch.head &&
+	test_cmp expect patch.head
+'
+
 test_expect_success 'in-body headers trigger content encoding' '
 	test_env GIT_AUTHOR_NAME="éxötìc" test_commit exotic &&
 	test_when_finished "git reset --hard HEAD^" &&
@@ -1310,7 +1492,7 @@ append_signoff()
 	C=$(git commit-tree HEAD^^{tree} -p HEAD) &&
 	git format-patch --stdout --signoff $C^..$C >append_signoff.patch &&
 	sed -n -e "1,/^---$/p" append_signoff.patch |
-		egrep -n "^Subject|Sign|^$"
+		grep -E -n "^Subject|Sign|^$"
 }
 
 test_expect_success 'signoff: commit with no body' '
@@ -1619,9 +1801,9 @@ test_expect_success 'cover letter with invalid --cover-from-description and conf
 	test_config branch.rebuild-1.description "config subject
 
 body" &&
-	test_must_fail git format-patch --cover-letter --cover-from-description garbage master &&
+	test_must_fail git format-patch --cover-letter --cover-from-description garbage main &&
 	test_config format.coverFromDescription garbage &&
-	test_must_fail git format-patch --cover-letter master
+	test_must_fail git format-patch --cover-letter main
 '
 
 test_expect_success 'cover letter with format.coverFromDescription = default' '
@@ -1630,7 +1812,7 @@ test_expect_success 'cover letter with format.coverFromDescription = default' '
 body" &&
 	test_config format.coverFromDescription default &&
 	git checkout rebuild-1 &&
-	git format-patch --stdout --cover-letter master >actual &&
+	git format-patch --stdout --cover-letter main >actual &&
 	grep "^Subject: \[PATCH 0/2\] \*\*\* SUBJECT HERE \*\*\*$" actual &&
 	! grep "^\*\*\* BLURB HERE \*\*\*$" actual &&
 	grep "^config subject$" actual &&
@@ -1642,7 +1824,7 @@ test_expect_success 'cover letter with --cover-from-description default' '
 
 body" &&
 	git checkout rebuild-1 &&
-	git format-patch --stdout --cover-letter --cover-from-description default master >actual &&
+	git format-patch --stdout --cover-letter --cover-from-description default main >actual &&
 	grep "^Subject: \[PATCH 0/2\] \*\*\* SUBJECT HERE \*\*\*$" actual &&
 	! grep "^\*\*\* BLURB HERE \*\*\*$" actual &&
 	grep "^config subject$" actual &&
@@ -1655,7 +1837,7 @@ test_expect_success 'cover letter with format.coverFromDescription = none' '
 body" &&
 	test_config format.coverFromDescription none &&
 	git checkout rebuild-1 &&
-	git format-patch --stdout --cover-letter master >actual &&
+	git format-patch --stdout --cover-letter main >actual &&
 	grep "^Subject: \[PATCH 0/2\] \*\*\* SUBJECT HERE \*\*\*$" actual &&
 	grep "^\*\*\* BLURB HERE \*\*\*$" actual &&
 	! grep "^config subject$" actual &&
@@ -1667,7 +1849,7 @@ test_expect_success 'cover letter with --cover-from-description none' '
 
 body" &&
 	git checkout rebuild-1 &&
-	git format-patch --stdout --cover-letter --cover-from-description none master >actual &&
+	git format-patch --stdout --cover-letter --cover-from-description none main >actual &&
 	grep "^Subject: \[PATCH 0/2\] \*\*\* SUBJECT HERE \*\*\*$" actual &&
 	grep "^\*\*\* BLURB HERE \*\*\*$" actual &&
 	! grep "^config subject$" actual &&
@@ -1680,7 +1862,7 @@ test_expect_success 'cover letter with format.coverFromDescription = message' '
 body" &&
 	test_config format.coverFromDescription message &&
 	git checkout rebuild-1 &&
-	git format-patch --stdout --cover-letter master >actual &&
+	git format-patch --stdout --cover-letter main >actual &&
 	grep "^Subject: \[PATCH 0/2\] \*\*\* SUBJECT HERE \*\*\*$" actual &&
 	! grep "^\*\*\* BLURB HERE \*\*\*$" actual &&
 	grep "^config subject$" actual &&
@@ -1692,7 +1874,7 @@ test_expect_success 'cover letter with --cover-from-description message' '
 
 body" &&
 	git checkout rebuild-1 &&
-	git format-patch --stdout --cover-letter --cover-from-description message master >actual &&
+	git format-patch --stdout --cover-letter --cover-from-description message main >actual &&
 	grep "^Subject: \[PATCH 0/2\] \*\*\* SUBJECT HERE \*\*\*$" actual &&
 	! grep "^\*\*\* BLURB HERE \*\*\*$" actual &&
 	grep "^config subject$" actual &&
@@ -1705,7 +1887,7 @@ test_expect_success 'cover letter with format.coverFromDescription = subject' '
 body" &&
 	test_config format.coverFromDescription subject &&
 	git checkout rebuild-1 &&
-	git format-patch --stdout --cover-letter master >actual &&
+	git format-patch --stdout --cover-letter main >actual &&
 	grep "^Subject: \[PATCH 0/2\] config subject$" actual &&
 	! grep "^\*\*\* BLURB HERE \*\*\*$" actual &&
 	! grep "^config subject$" actual &&
@@ -1717,20 +1899,30 @@ test_expect_success 'cover letter with --cover-from-description subject' '
 
 body" &&
 	git checkout rebuild-1 &&
-	git format-patch --stdout --cover-letter --cover-from-description subject master >actual &&
+	git format-patch --stdout --cover-letter --cover-from-description subject main >actual &&
 	grep "^Subject: \[PATCH 0/2\] config subject$" actual &&
 	! grep "^\*\*\* BLURB HERE \*\*\*$" actual &&
 	! grep "^config subject$" actual &&
 	grep "^body$" actual
 '
 
+test_expect_success 'cover letter with --cover-from-description subject (UTF-8 subject line)' '
+	test_config branch.rebuild-1.description "Café?
+
+body" &&
+	git checkout rebuild-1 &&
+	git format-patch --stdout --cover-letter --cover-from-description subject --encode-email-headers main >actual &&
+	grep "^Subject: \[PATCH 0/2\] =?UTF-8?q?Caf=C3=A9=3F?=$" actual &&
+	! grep "Café" actual
+'
+
 test_expect_success 'cover letter with format.coverFromDescription = auto (short subject line)' '
 	test_config branch.rebuild-1.description "config subject
 
 body" &&
 	test_config format.coverFromDescription auto &&
 	git checkout rebuild-1 &&
-	git format-patch --stdout --cover-letter master >actual &&
+	git format-patch --stdout --cover-letter main >actual &&
 	grep "^Subject: \[PATCH 0/2\] config subject$" actual &&
 	! grep "^\*\*\* BLURB HERE \*\*\*$" actual &&
 	! grep "^config subject$" actual &&
@@ -1742,7 +1934,7 @@ test_expect_success 'cover letter with --cover-from-description auto (short subj
 
 body" &&
 	git checkout rebuild-1 &&
-	git format-patch --stdout --cover-letter --cover-from-description auto master >actual &&
+	git format-patch --stdout --cover-letter --cover-from-description auto main >actual &&
 	grep "^Subject: \[PATCH 0/2\] config subject$" actual &&
 	! grep "^\*\*\* BLURB HERE \*\*\*$" actual &&
 	! grep "^config subject$" actual &&
@@ -1755,7 +1947,7 @@ test_expect_success 'cover letter with format.coverFromDescription = auto (long
 body" &&
 	test_config format.coverFromDescription auto &&
 	git checkout rebuild-1 &&
-	git format-patch --stdout --cover-letter master >actual &&
+	git format-patch --stdout --cover-letter main >actual &&
 	grep "^Subject: \[PATCH 0/2\] \*\*\* SUBJECT HERE \*\*\*$" actual &&
 	! grep "^\*\*\* BLURB HERE \*\*\*$" actual &&
 	grep "^this is a really long first line and it is over 100 characters long which is the threshold for long subjects$" actual &&
@@ -1767,7 +1959,7 @@ test_expect_success 'cover letter with --cover-from-description auto (long subje
 
 body" &&
 	git checkout rebuild-1 &&
-	git format-patch --stdout --cover-letter --cover-from-description auto master >actual &&
+	git format-patch --stdout --cover-letter --cover-from-description auto main >actual &&
 	grep "^Subject: \[PATCH 0/2\] \*\*\* SUBJECT HERE \*\*\*$" actual &&
 	! grep "^\*\*\* BLURB HERE \*\*\*$" actual &&
 	grep "^this is a really long first line and it is over 100 characters long which is the threshold for long subjects$" actual &&
@@ -1780,7 +1972,7 @@ test_expect_success 'cover letter with command-line --cover-from-description ove
 body" &&
 	test_config format.coverFromDescription none &&
 	git checkout rebuild-1 &&
-	git format-patch --stdout --cover-letter --cover-from-description subject master >actual &&
+	git format-patch --stdout --cover-letter --cover-from-description subject main >actual &&
 	grep "^Subject: \[PATCH 0/2\] config subject$" actual &&
 	! grep "^\*\*\* BLURB HERE \*\*\*$" actual &&
 	! grep "^config subject$" actual &&
@@ -1790,7 +1982,7 @@ body" &&
 test_expect_success 'cover letter using branch description (1)' '
 	git checkout rebuild-1 &&
 	test_config branch.rebuild-1.description hello &&
-	git format-patch --stdout --cover-letter master >actual &&
+	git format-patch --stdout --cover-letter main >actual &&
 	grep hello actual
 '
 
@@ -1804,14 +1996,14 @@ test_expect_success 'cover letter using branch description (2)' '
 test_expect_success 'cover letter using branch description (3)' '
 	git checkout rebuild-1 &&
 	test_config branch.rebuild-1.description hello &&
-	git format-patch --stdout --cover-letter ^master rebuild-1 >actual &&
+	git format-patch --stdout --cover-letter ^main rebuild-1 >actual &&
 	grep hello actual
 '
 
 test_expect_success 'cover letter using branch description (4)' '
 	git checkout rebuild-1 &&
 	test_config branch.rebuild-1.description hello &&
-	git format-patch --stdout --cover-letter master.. >actual &&
+	git format-patch --stdout --cover-letter main.. >actual &&
 	grep hello actual
 '
 
@@ -1829,6 +2021,20 @@ test_expect_success 'cover letter using branch description (6)' '
 	grep hello actual
 '
 
+test_expect_success 'cover letter with --description-file' '
+	test_when_finished "rm -f description.txt" &&
+	cat >description.txt <<-\EOF &&
+	subject from file
+
+	body from file
+	EOF
+	git checkout rebuild-1 &&
+	git format-patch --stdout --cover-letter --cover-from-description auto \
+		--description-file description.txt main >actual &&
+	grep "^Subject: \[PATCH 0/2\] subject from file$" actual &&
+	grep "^body from file$" actual
+'
+
 test_expect_success 'cover letter with nothing' '
 	git format-patch --stdout --cover-letter >actual &&
 	test_line_count = 0 actual
@@ -1878,8 +2084,8 @@ test_expect_success 'From line has expected format' '
 
 test_expect_success 'format-patch -o with no leading directories' '
 	rm -fr patches &&
-	git format-patch -o patches master..side &&
-	count=$(git rev-list --count master..side) &&
+	git format-patch -o patches main..side &&
+	count=$(git rev-list --count main..side) &&
 	ls patches >list &&
 	test_line_count = $count list
 '
@@ -1887,16 +2093,16 @@ test_expect_success 'format-patch -o with no leading directories' '
 test_expect_success 'format-patch -o with leading existing directories' '
 	rm -rf existing-dir &&
 	mkdir existing-dir &&
-	git format-patch -o existing-dir/patches master..side &&
-	count=$(git rev-list --count master..side) &&
+	git format-patch -o existing-dir/patches main..side &&
+	count=$(git rev-list --count main..side) &&
 	ls existing-dir/patches >list &&
 	test_line_count = $count list
 '
 
 test_expect_success 'format-patch -o with leading non-existing directories' '
 	rm -rf non-existing-dir &&
-	git format-patch -o non-existing-dir/patches master..side &&
-	count=$(git rev-list --count master..side) &&
+	git format-patch -o non-existing-dir/patches main..side &&
+	count=$(git rev-list --count main..side) &&
 	test_path_is_dir non-existing-dir &&
 	ls non-existing-dir/patches >list &&
 	test_line_count = $count list
@@ -1905,8 +2111,8 @@ test_expect_success 'format-patch -o with leading non-existing directories' '
 test_expect_success 'format-patch format.outputDirectory option' '
 	test_config format.outputDirectory patches &&
 	rm -fr patches &&
-	git format-patch master..side &&
-	count=$(git rev-list --count master..side) &&
+	git format-patch main..side &&
+	count=$(git rev-list --count main..side) &&
 	ls patches >list &&
 	test_line_count = $count list
 '
@@ -1914,11 +2120,44 @@ test_expect_success 'format-patch format.outputDirectory option' '
 test_expect_success 'format-patch -o overrides format.outputDirectory' '
 	test_config format.outputDirectory patches &&
 	rm -fr patches patchset &&
-	git format-patch master..side -o patchset &&
+	git format-patch main..side -o patchset &&
 	test_path_is_missing patches &&
 	test_path_is_dir patchset
 '
 
+test_expect_success 'format-patch forbids multiple outputs' '
+	rm -fr outfile outdir &&
+	test_must_fail \
+		git format-patch --stdout --output-directory=outdir &&
+	test_must_fail \
+		git format-patch --stdout --output=outfile &&
+	test_must_fail \
+		git format-patch --output=outfile --output-directory=outdir
+'
+
+test_expect_success 'configured outdir does not conflict with output options' '
+	rm -fr outfile outdir &&
+	test_config format.outputDirectory outdir &&
+	git format-patch --stdout &&
+	test_path_is_missing outdir &&
+	git format-patch --output=outfile &&
+	test_path_is_missing outdir
+'
+
+test_expect_success 'format-patch --output' '
+	rm -fr outfile &&
+	git format-patch -3 --stdout HEAD >expect &&
+	git format-patch -3 --output=outfile HEAD &&
+	test_cmp expect outfile
+'
+
+test_expect_success 'format-patch --cover-letter --output' '
+	rm -fr outfile &&
+	git format-patch --cover-letter -3 --stdout HEAD >expect &&
+	git format-patch --cover-letter -3 --output=outfile HEAD &&
+	test_cmp expect outfile
+'
+
 test_expect_success 'format-patch --base' '
 	git checkout patchid &&
 
@@ -1978,14 +2217,14 @@ test_expect_success 'format-patch --base errors out when base commit is not ance
 	#	  ------------W
 	#
 	# If "format-patch Z..X" is given, P and Z can not be specified as the base commit
-	git checkout -b topic1 master &&
+	git checkout -b topic1 main &&
 	git rev-parse HEAD >commit-id-base &&
 	test_commit P &&
 	git rev-parse HEAD >commit-id-P &&
 	test_commit Z &&
 	git rev-parse HEAD >commit-id-Z &&
 	test_commit Y &&
-	git checkout -b topic2 master &&
+	git checkout -b topic2 main &&
 	test_commit W &&
 	git merge topic1 &&
 	test_commit X &&
@@ -1998,7 +2237,7 @@ test_expect_success 'format-patch --base errors out when base commit is not ance
 '
 
 test_expect_success 'format-patch --base=auto' '
-	git checkout -b upstream master &&
+	git checkout -b upstream main &&
 	git checkout -b local upstream &&
 	git branch --set-upstream-to=upstream &&
 	test_commit N1 &&
@@ -2019,11 +2258,11 @@ test_expect_success 'format-patch errors out when history involves criss-cross'
 	#  \ / \
 	#   C---M2---E
 	#
-	git checkout master &&
+	git checkout main &&
 	test_commit A &&
-	git checkout -b xb master &&
+	git checkout -b xb main &&
 	test_commit B &&
-	git checkout -b xc master &&
+	git checkout -b xc main &&
 	test_commit C &&
 	git checkout -b xbc xb -- &&
 	git merge xc &&
@@ -2037,6 +2276,12 @@ test_expect_success 'format-patch errors out when history involves criss-cross'
 	test_must_fail 	git format-patch --base=auto -1
 '
 
+test_expect_success 'format-patch format.useAutoBase whenAble history involves criss-cross' '
+	test_config format.useAutoBase whenAble &&
+	git format-patch -1 >patch &&
+	! grep "^base-commit:" patch
+'
+
 test_expect_success 'format-patch format.useAutoBase option' '
 	git checkout local &&
 	test_config format.useAutoBase true &&
@@ -2047,6 +2292,16 @@ test_expect_success 'format-patch format.useAutoBase option' '
 	test_cmp expect actual
 '
 
+test_expect_success 'format-patch format.useAutoBase option with whenAble' '
+	git checkout local &&
+	test_config format.useAutoBase whenAble &&
+	git format-patch --stdout -1 >patch &&
+	grep "^base-commit:" patch >actual &&
+	git rev-parse upstream >commit-id-base &&
+	echo "base-commit: $(cat commit-id-base)" >expect &&
+	test_cmp expect actual
+'
+
 test_expect_success 'format-patch --base overrides format.useAutoBase' '
 	test_config format.useAutoBase true &&
 	git format-patch --stdout --base=HEAD~1 -1 >patch &&
@@ -2062,6 +2317,12 @@ test_expect_success 'format-patch --no-base overrides format.useAutoBase' '
 	! grep "^base-commit:" patch
 '
 
+test_expect_success 'format-patch --no-base overrides format.useAutoBase whenAble' '
+	test_config format.useAutoBase whenAble &&
+	git format-patch --stdout --no-base -1 >patch &&
+	! grep "^base-commit:" patch
+'
+
 test_expect_success 'format-patch --base with --attach' '
 	git format-patch --attach=mimemime --stdout --base=HEAD~ -1 >patch &&
 	sed -n -e "/^base-commit:/s/.*/1/p" -e "/^---*mimemime--$/s/.*/2/p" \
@@ -2072,14 +2333,32 @@ test_expect_success 'format-patch --base with --attach' '
 test_expect_success 'format-patch --attach cover-letter only is non-multipart' '
 	test_when_finished "rm -fr patches" &&
 	git format-patch -o patches --cover-letter --attach=mimemime --base=HEAD~ -1 &&
-	! egrep "^--+mimemime" patches/0000*.patch &&
-	egrep "^--+mimemime$" patches/0001*.patch >output &&
+	! grep -E "^--+mimemime" patches/0000*.patch &&
+	grep -E "^--+mimemime$" patches/0001*.patch >output &&
 	test_line_count = 2 output &&
-	egrep "^--+mimemime--$" patches/0001*.patch >output &&
+	grep -E "^--+mimemime--$" patches/0001*.patch >output &&
 	test_line_count = 1 output
 '
 
-test_expect_success 'format-patch --pretty=mboxrd' '
+test_expect_success 'format-patch with format.attach' '
+	test_when_finished "rm -fr patches" &&
+	separator=attachment-separator &&
+	test_config format.attach "$separator" &&
+	filename=$(git format-patch -o patches -1) &&
+	grep "^Content-Type: multipart/.*$separator" "$filename"
+'
+
+test_expect_success 'format-patch with format.attach=disabled' '
+	test_when_finished "rm -fr patches" &&
+	separator=attachment-separator &&
+	test_config_global format.attach "$separator" &&
+	test_config format.attach "" &&
+	filename=$(git format-patch -o patches -1) &&
+	# The output should not even declare content type for text/plain.
+	! grep "^Content-Type: multipart/" "$filename"
+'
+
+test_expect_success '-c format.mboxrd format-patch' '
 	sp=" " &&
 	cat >msg <<-INPUT_END &&
 	mboxrd should escape the body
@@ -2114,14 +2393,16 @@ test_expect_success 'format-patch --pretty=mboxrd' '
 	INPUT_END
 
 	C=$(git commit-tree HEAD^^{tree} -p HEAD <msg) &&
-	git format-patch --pretty=mboxrd --stdout -1 $C~1..$C >patch &&
+	git -c format.mboxrd format-patch --stdout -1 $C~1..$C >patch &&
+	git format-patch --pretty=mboxrd --stdout -1 $C~1..$C >compat &&
+	test_cmp patch compat &&
 	git grep -h --no-index -A11 \
 		"^>From could trip up a loose mbox parser" patch >actual &&
 	test_cmp expect actual
 '
 
 test_expect_success 'interdiff: setup' '
-	git checkout -b boop master &&
+	git checkout -b boop main &&
 	test_commit fnorp blorp &&
 	test_commit fleep blorp
 '
@@ -2132,15 +2413,25 @@ test_expect_success 'interdiff: cover-letter' '
 	--q
 	EOF
 	git format-patch --cover-letter --interdiff=boop~2 -1 boop &&
-	test_i18ngrep "^Interdiff:$" 0000-cover-letter.patch &&
-	test_i18ngrep ! "^Interdiff:$" 0001-fleep.patch &&
+	test_grep "^Interdiff:$" 0000-cover-letter.patch &&
+	test_grep ! "^Interdiff:$" 0001-fleep.patch &&
 	sed "1,/^@@ /d; /^-- $/q" 0000-cover-letter.patch >actual &&
 	test_cmp expect actual
 '
 
 test_expect_success 'interdiff: reroll-count' '
 	git format-patch --cover-letter --interdiff=boop~2 -v2 -1 boop &&
-	test_i18ngrep "^Interdiff ..* v1:$" v2-0000-cover-letter.patch
+	test_grep "^Interdiff ..* v1:$" v2-0000-cover-letter.patch
+'
+
+test_expect_success 'interdiff: reroll-count with a non-integer' '
+	git format-patch --cover-letter --interdiff=boop~2 -v2.2 -1 boop &&
+	test_grep "^Interdiff:$" v2.2-0000-cover-letter.patch
+'
+
+test_expect_success 'interdiff: reroll-count with a integer' '
+	git format-patch --cover-letter --interdiff=boop~2 -v2 -1 boop &&
+	test_grep "^Interdiff ..* v1:$" v2-0000-cover-letter.patch
 '
 
 test_expect_success 'interdiff: solo-patch' '
@@ -2149,9 +2440,25 @@ test_expect_success 'interdiff: solo-patch' '
 
 	EOF
 	git format-patch --interdiff=boop~2 -1 boop &&
-	test_i18ngrep "^Interdiff:$" 0001-fleep.patch &&
+	test_grep "^Interdiff:$" 0001-fleep.patch &&
 	sed "1,/^  @@ /d; /^$/q" 0001-fleep.patch >actual &&
 	test_cmp expect actual
 '
 
+test_expect_success 'format-patch does not respect diff.noprefix' '
+	git -c diff.noprefix format-patch -1 --stdout >actual &&
+	grep "^--- a/blorp" actual
+'
+
+test_expect_success 'format-patch respects format.noprefix' '
+	git -c format.noprefix format-patch -1 --stdout >actual &&
+	grep "^--- blorp" actual
+'
+
+test_expect_success 'format-patch --default-prefix overrides format.noprefix' '
+	git -c format.noprefix \
+		format-patch -1 --default-prefix --stdout >actual &&
+	grep "^--- a/blorp" actual
+'
+
 test_done
diff --git a/t/t4015-diff-whitespace.sh b/t/t4015-diff-whitespace.sh
index 88d3026..b443626 100755
--- a/t/t4015-diff-whitespace.sh
+++ b/t/t4015-diff-whitespace.sh
@@ -1,13 +1,52 @@
 #!/bin/sh
 #
 # Copyright (c) 2006 Johannes E. Schindelin
-#
+# Copyright (c) 2023 Google LLC
 
 test_description='Test special whitespace in diff engine.
 
 '
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
-. "$TEST_DIRECTORY"/diff-lib.sh
+. "$TEST_DIRECTORY"/lib-diff.sh
+
+for opt_res in --patch --quiet -s --stat --shortstat --dirstat=lines \
+	       --raw! --name-only! --name-status!
+do
+	opts=${opt_res%!} expect_failure=
+	test "$opts" = "$opt_res" ||
+		expect_failure="test_expect_code 1"
+
+	test_expect_success "status with $opts (different)" '
+		echo foo >x &&
+		git add x &&
+		echo bar >x &&
+		test_expect_code 1 git diff -w $opts --exit-code x
+	'
+
+	test_expect_success POSIXPERM "status with $opts (mode differs)" '
+		test_when_finished "git update-index --chmod=-x x" &&
+		echo foo >x &&
+		git add x &&
+		git update-index --chmod=+x x &&
+		test_expect_code 1 git diff -w $opts --exit-code x
+	'
+
+	test_expect_success "status with $opts (removing an empty file)" '
+		: >x &&
+		git add x &&
+		rm x &&
+		test_expect_code 1 git diff -w $opts --exit-code -- x
+	'
+
+	test_expect_success "status with $opts (different but equivalent)" '
+		echo foo >x &&
+		git add x &&
+		echo " foo" >x &&
+		$expect_failure git diff -w $opts --exit-code x
+	'
+done
 
 test_expect_success "Ray Lehtiniemi's example" '
 	cat <<-\EOF >x &&
@@ -567,6 +606,30 @@ test_expect_success '--check and --quiet are not exclusive' '
 	git diff --check --quiet
 '
 
+test_expect_success '-w and --exit-code interact sensibly' '
+	test_when_finished "git checkout x" &&
+	{
+		test_seq 15 &&
+		echo " 16"
+	} >x &&
+	test_must_fail git diff --exit-code &&
+	git diff -w >actual &&
+	test_must_be_empty actual &&
+	git diff -w --exit-code
+'
+
+test_expect_success '-I and --exit-code interact sensibly' '
+	test_when_finished "git checkout x" &&
+	{
+		test_seq 15 &&
+		echo " 16"
+	} >x &&
+	test_must_fail git diff --exit-code &&
+	git diff -I. >actual &&
+	test_must_be_empty actual &&
+	git diff -I. --exit-code
+'
+
 test_expect_success 'check staged with no whitespace errors' '
 	echo "foo();" >x &&
 	git add x &&
@@ -789,7 +852,7 @@ test_expect_success 'checkdiff allows new blank lines' '
 	git diff --check
 '
 
-test_expect_success 'whitespace-only changes not reported' '
+test_expect_success 'whitespace-only changes not reported (diff)' '
 	git reset --hard &&
 	echo >x "hello world" &&
 	git add x &&
@@ -799,9 +862,43 @@ test_expect_success 'whitespace-only changes not reported' '
 	test_must_be_empty actual
 '
 
-test_expect_success 'whitespace-only changes reported across renames' '
+test_expect_success 'whitespace-only changes not reported (diffstat)' '
+	# reuse state from previous test
+	git diff --stat -b >actual &&
+	test_must_be_empty actual
+'
+
+test_expect_success 'whitespace changes with modification reported (diffstat)' '
 	git reset --hard &&
-	for i in 1 2 3 4 5 6 7 8 9; do echo "$i$i$i$i$i$i"; done >x &&
+	echo >x "hello  world" &&
+	git update-index --chmod=+x x &&
+	git diff --stat --cached -b >actual &&
+	cat <<-EOF >expect &&
+	 x | 0
+	 1 file changed, 0 insertions(+), 0 deletions(-)
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'whitespace-only changes reported across renames (diffstat)' '
+	git reset --hard &&
+	for i in 1 2 3 4 5 6 7 8 9; do echo "$i$i$i$i$i$i" || return 1; done >x &&
+	git add x &&
+	git commit -m "base" &&
+	sed -e "5s/^/ /" x >z &&
+	git rm x &&
+	git add z &&
+	git diff -w -M --cached --stat >actual &&
+	cat <<-EOF >expect &&
+	 x => z | 0
+	 1 file changed, 0 insertions(+), 0 deletions(-)
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'whitespace-only changes reported across renames' '
+	git reset --hard HEAD~1 &&
+	for i in 1 2 3 4 5 6 7 8 9; do echo "$i$i$i$i$i$i" || return 1; done >x &&
 	git add x &&
 	hash_x=$(git hash-object x) &&
 	before=$(git rev-parse --short "$hash_x") &&
@@ -843,13 +940,13 @@ test_expect_success 'rename empty' '
 test_expect_success 'combined diff with autocrlf conversion' '
 
 	git reset --hard &&
-	echo >x hello &&
-	git commit -m "one side" x &&
+	test_commit "one side" x hello one-side &&
 	git checkout HEAD^ &&
 	echo >x goodbye &&
 	git commit -m "the other side" x &&
 	git config core.autocrlf true &&
-	test_must_fail git merge master &&
+	test_must_fail git merge one-side >actual &&
+	test_grep "Automatic merge failed" actual &&
 
 	git diff >actual.raw &&
 	sed -e "1,/^@@@/d" actual.raw >actual &&
@@ -1384,6 +1481,143 @@ test_expect_success 'detect permutations inside moved code -- dimmed-zebra' '
 	test_cmp expected actual
 '
 
+test_expect_success 'zebra alternate color is only used when necessary' '
+	cat >old.txt <<-\EOF &&
+	line 1A should be marked as oldMoved newMovedAlternate
+	line 1B should be marked as oldMoved newMovedAlternate
+	unchanged
+	line 2A should be marked as oldMoved newMovedAlternate
+	line 2B should be marked as oldMoved newMovedAlternate
+	line 3A should be marked as oldMovedAlternate newMoved
+	line 3B should be marked as oldMovedAlternate newMoved
+	unchanged
+	line 4A should be marked as oldMoved newMovedAlternate
+	line 4B should be marked as oldMoved newMovedAlternate
+	line 5A should be marked as oldMovedAlternate newMoved
+	line 5B should be marked as oldMovedAlternate newMoved
+	line 6A should be marked as oldMoved newMoved
+	line 6B should be marked as oldMoved newMoved
+	EOF
+	cat >new.txt <<-\EOF &&
+	  line 1A should be marked as oldMoved newMovedAlternate
+	  line 1B should be marked as oldMoved newMovedAlternate
+	unchanged
+	  line 3A should be marked as oldMovedAlternate newMoved
+	  line 3B should be marked as oldMovedAlternate newMoved
+	  line 2A should be marked as oldMoved newMovedAlternate
+	  line 2B should be marked as oldMoved newMovedAlternate
+	unchanged
+	  line 6A should be marked as oldMoved newMoved
+	  line 6B should be marked as oldMoved newMoved
+	    line 4A should be marked as oldMoved newMovedAlternate
+	    line 4B should be marked as oldMoved newMovedAlternate
+	  line 5A should be marked as oldMovedAlternate newMoved
+	  line 5B should be marked as oldMovedAlternate newMoved
+	EOF
+	test_expect_code 1 git diff --no-index --color --color-moved=zebra \
+		 --color-moved-ws=allow-indentation-change \
+		 old.txt new.txt >output &&
+	grep -v index output | test_decode_color >actual &&
+	cat >expected <<-\EOF &&
+	<BOLD>diff --git a/old.txt b/new.txt<RESET>
+	<BOLD>--- a/old.txt<RESET>
+	<BOLD>+++ b/new.txt<RESET>
+	<CYAN>@@ -1,14 +1,14 @@<RESET>
+	<BOLD;MAGENTA>-line 1A should be marked as oldMoved newMovedAlternate<RESET>
+	<BOLD;MAGENTA>-line 1B should be marked as oldMoved newMovedAlternate<RESET>
+	<BOLD;CYAN>+<RESET><BOLD;CYAN>  line 1A should be marked as oldMoved newMovedAlternate<RESET>
+	<BOLD;CYAN>+<RESET><BOLD;CYAN>  line 1B should be marked as oldMoved newMovedAlternate<RESET>
+	 unchanged<RESET>
+	<BOLD;MAGENTA>-line 2A should be marked as oldMoved newMovedAlternate<RESET>
+	<BOLD;MAGENTA>-line 2B should be marked as oldMoved newMovedAlternate<RESET>
+	<BOLD;BLUE>-line 3A should be marked as oldMovedAlternate newMoved<RESET>
+	<BOLD;BLUE>-line 3B should be marked as oldMovedAlternate newMoved<RESET>
+	<BOLD;CYAN>+<RESET><BOLD;CYAN>  line 3A should be marked as oldMovedAlternate newMoved<RESET>
+	<BOLD;CYAN>+<RESET><BOLD;CYAN>  line 3B should be marked as oldMovedAlternate newMoved<RESET>
+	<BOLD;YELLOW>+<RESET><BOLD;YELLOW>  line 2A should be marked as oldMoved newMovedAlternate<RESET>
+	<BOLD;YELLOW>+<RESET><BOLD;YELLOW>  line 2B should be marked as oldMoved newMovedAlternate<RESET>
+	 unchanged<RESET>
+	<BOLD;MAGENTA>-line 4A should be marked as oldMoved newMovedAlternate<RESET>
+	<BOLD;MAGENTA>-line 4B should be marked as oldMoved newMovedAlternate<RESET>
+	<BOLD;BLUE>-line 5A should be marked as oldMovedAlternate newMoved<RESET>
+	<BOLD;BLUE>-line 5B should be marked as oldMovedAlternate newMoved<RESET>
+	<BOLD;MAGENTA>-line 6A should be marked as oldMoved newMoved<RESET>
+	<BOLD;MAGENTA>-line 6B should be marked as oldMoved newMoved<RESET>
+	<BOLD;CYAN>+<RESET><BOLD;CYAN>  line 6A should be marked as oldMoved newMoved<RESET>
+	<BOLD;CYAN>+<RESET><BOLD;CYAN>  line 6B should be marked as oldMoved newMoved<RESET>
+	<BOLD;YELLOW>+<RESET><BOLD;YELLOW>    line 4A should be marked as oldMoved newMovedAlternate<RESET>
+	<BOLD;YELLOW>+<RESET><BOLD;YELLOW>    line 4B should be marked as oldMoved newMovedAlternate<RESET>
+	<BOLD;CYAN>+<RESET><BOLD;CYAN>  line 5A should be marked as oldMovedAlternate newMoved<RESET>
+	<BOLD;CYAN>+<RESET><BOLD;CYAN>  line 5B should be marked as oldMovedAlternate newMoved<RESET>
+	EOF
+	test_cmp expected actual
+'
+
+test_expect_success 'short lines of opposite sign do not get marked as moved' '
+	cat >old.txt <<-\EOF &&
+	this line should be marked as moved
+	unchanged
+	unchanged
+	unchanged
+	unchanged
+	too short
+	this line should be marked as oldMoved newMoved
+	this line should be marked as oldMovedAlternate newMoved
+	unchanged 1
+	unchanged 2
+	unchanged 3
+	unchanged 4
+	this line should be marked as oldMoved newMoved/newMovedAlternate
+	EOF
+	cat >new.txt <<-\EOF &&
+	too short
+	unchanged
+	unchanged
+	this line should be marked as moved
+	too short
+	unchanged
+	unchanged
+	this line should be marked as oldMoved newMoved/newMovedAlternate
+	unchanged 1
+	unchanged 2
+	this line should be marked as oldMovedAlternate newMoved
+	this line should be marked as oldMoved newMoved/newMovedAlternate
+	unchanged 3
+	this line should be marked as oldMoved newMoved
+	unchanged 4
+	EOF
+	test_expect_code 1 git diff --no-index --color --color-moved=zebra \
+		old.txt new.txt >output && cat output &&
+	grep -v index output | test_decode_color >actual &&
+	cat >expect <<-\EOF &&
+	<BOLD>diff --git a/old.txt b/new.txt<RESET>
+	<BOLD>--- a/old.txt<RESET>
+	<BOLD>+++ b/new.txt<RESET>
+	<CYAN>@@ -1,13 +1,15 @@<RESET>
+	<BOLD;MAGENTA>-this line should be marked as moved<RESET>
+	<GREEN>+<RESET><GREEN>too short<RESET>
+	 unchanged<RESET>
+	 unchanged<RESET>
+	<BOLD;CYAN>+<RESET><BOLD;CYAN>this line should be marked as moved<RESET>
+	<GREEN>+<RESET><GREEN>too short<RESET>
+	 unchanged<RESET>
+	 unchanged<RESET>
+	<RED>-too short<RESET>
+	<BOLD;MAGENTA>-this line should be marked as oldMoved newMoved<RESET>
+	<BOLD;BLUE>-this line should be marked as oldMovedAlternate newMoved<RESET>
+	<BOLD;CYAN>+<RESET><BOLD;CYAN>this line should be marked as oldMoved newMoved/newMovedAlternate<RESET>
+	 unchanged 1<RESET>
+	 unchanged 2<RESET>
+	<BOLD;CYAN>+<RESET><BOLD;CYAN>this line should be marked as oldMovedAlternate newMoved<RESET>
+	<BOLD;YELLOW>+<RESET><BOLD;YELLOW>this line should be marked as oldMoved newMoved/newMovedAlternate<RESET>
+	 unchanged 3<RESET>
+	<BOLD;CYAN>+<RESET><BOLD;CYAN>this line should be marked as oldMoved newMoved<RESET>
+	 unchanged 4<RESET>
+	<BOLD;MAGENTA>-this line should be marked as oldMoved newMoved/newMovedAlternate<RESET>
+	EOF
+	test_cmp expect actual
+'
+
 test_expect_success 'cmd option assumes configured colored-moved' '
 	test_config color.diff.oldMoved "magenta" &&
 	test_config color.diff.newMoved "cyan" &&
@@ -1427,7 +1661,7 @@ test_expect_success 'cmd option assumes configured colored-moved' '
 	test_cmp expected actual
 '
 
-test_expect_success 'no effect from --color-moved with --word-diff' '
+test_expect_success 'no effect on diff from --color-moved with --word-diff' '
 	cat <<-\EOF >text.txt &&
 	Lorem Ipsum is simply dummy text of the printing and typesetting industry.
 	EOF
@@ -1441,6 +1675,12 @@ test_expect_success 'no effect from --color-moved with --word-diff' '
 	test_cmp expect actual
 '
 
+test_expect_success 'no effect on show from --color-moved with --word-diff' '
+	git show --color-moved --word-diff >actual &&
+	git show --word-diff >expect &&
+	test_cmp expect actual
+'
+
 test_expect_success 'set up whitespace tests' '
 	git reset --hard &&
 	# Note that these lines have no leading or trailing whitespace.
@@ -1775,6 +2015,52 @@ test_expect_success '--color-moved treats adjacent blocks as separate for MIN_AL
 	test_cmp expected actual
 '
 
+test_expect_success '--color-moved rewinds for MIN_ALNUM_COUNT' '
+	git reset --hard &&
+	test_write_lines >file \
+		A B C one two three four five six seven D E F G H I J &&
+	git add file &&
+	test_write_lines >file \
+		one two A B C D E F G H I J two three four five six seven &&
+	git diff --color-moved=zebra -- file &&
+
+	git diff --color-moved=zebra --color -- file >actual.raw &&
+	grep -v "index" actual.raw | test_decode_color >actual &&
+	cat >expected <<-\EOF &&
+	<BOLD>diff --git a/file b/file<RESET>
+	<BOLD>--- a/file<RESET>
+	<BOLD>+++ b/file<RESET>
+	<CYAN>@@ -1,13 +1,8 @@<RESET>
+	<GREEN>+<RESET><GREEN>one<RESET>
+	<GREEN>+<RESET><GREEN>two<RESET>
+	 A<RESET>
+	 B<RESET>
+	 C<RESET>
+	<RED>-one<RESET>
+	<BOLD;MAGENTA>-two<RESET>
+	<BOLD;MAGENTA>-three<RESET>
+	<BOLD;MAGENTA>-four<RESET>
+	<BOLD;MAGENTA>-five<RESET>
+	<BOLD;MAGENTA>-six<RESET>
+	<BOLD;MAGENTA>-seven<RESET>
+	 D<RESET>
+	 E<RESET>
+	 F<RESET>
+	<CYAN>@@ -15,3 +10,9 @@<RESET> <RESET>G<RESET>
+	 H<RESET>
+	 I<RESET>
+	 J<RESET>
+	<BOLD;CYAN>+<RESET><BOLD;CYAN>two<RESET>
+	<BOLD;CYAN>+<RESET><BOLD;CYAN>three<RESET>
+	<BOLD;CYAN>+<RESET><BOLD;CYAN>four<RESET>
+	<BOLD;CYAN>+<RESET><BOLD;CYAN>five<RESET>
+	<BOLD;CYAN>+<RESET><BOLD;CYAN>six<RESET>
+	<BOLD;CYAN>+<RESET><BOLD;CYAN>seven<RESET>
+	EOF
+
+	test_cmp expected actual
+'
+
 test_expect_success 'move detection with submodules' '
 	test_create_repo bananas &&
 	echo ripe >bananas/recipe &&
@@ -1938,37 +2224,37 @@ test_expect_success 'compare whitespace delta across moved blocks' '
 
 test_expect_success 'bogus settings in move detection erroring out' '
 	test_must_fail git diff --color-moved=bogus 2>err &&
-	test_i18ngrep "must be one of" err &&
-	test_i18ngrep bogus err &&
+	test_grep "must be one of" err &&
+	test_grep bogus err &&
 
 	test_must_fail git -c diff.colormoved=bogus diff 2>err &&
-	test_i18ngrep "must be one of" err &&
-	test_i18ngrep "from command-line config" err &&
+	test_grep "must be one of" err &&
+	test_grep "from command-line config" err &&
 
 	test_must_fail git diff --color-moved-ws=bogus 2>err &&
-	test_i18ngrep "possible values" err &&
-	test_i18ngrep bogus err &&
+	test_grep "possible values" err &&
+	test_grep bogus err &&
 
 	test_must_fail git -c diff.colormovedws=bogus diff 2>err &&
-	test_i18ngrep "possible values" err &&
-	test_i18ngrep "from command-line config" err
+	test_grep "possible values" err &&
+	test_grep "from command-line config" err
 '
 
 test_expect_success 'compare whitespace delta incompatible with other space options' '
 	test_must_fail git diff \
 		--color-moved-ws=allow-indentation-change,ignore-all-space \
 		2>err &&
-	test_i18ngrep allow-indentation-change err
+	test_grep allow-indentation-change err
 '
 
 EMPTY=''
 test_expect_success 'compare mixed whitespace delta across moved blocks' '
 
 	git reset --hard &&
-	tr Q_ "\t " <<-EOF >text.txt &&
-	${EMPTY}
-	____too short without
-	${EMPTY}
+	tr "^|Q_" "\f\v\t " <<-EOF >text.txt &&
+	^__
+	|____too short without
+	^
 	___being grouped across blank line
 	${EMPTY}
 	context
@@ -1987,7 +2273,7 @@ test_expect_success 'compare mixed whitespace delta across moved blocks' '
 	git add text.txt &&
 	git commit -m "add text.txt" &&
 
-	tr Q_ "\t " <<-EOF >text.txt &&
+	tr "^|Q_" "\f\v\t " <<-EOF >text.txt &&
 	context
 	lines
 	to
@@ -1998,7 +2284,7 @@ test_expect_success 'compare mixed whitespace delta across moved blocks' '
 	${EMPTY}
 	QQtoo short without
 	${EMPTY}
-	Q_______being grouped across blank line
+	^Q_______being grouped across blank line
 	${EMPTY}
 	Q_QThese two lines have had their
 	indentation reduced by four spaces
@@ -2010,16 +2296,16 @@ test_expect_success 'compare mixed whitespace delta across moved blocks' '
 		-c core.whitespace=space-before-tab \
 		diff --color --color-moved --ws-error-highlight=all \
 		--color-moved-ws=allow-indentation-change >actual.raw &&
-	grep -v "index" actual.raw | test_decode_color >actual &&
+	grep -v "index" actual.raw | tr "\f\v" "^|" | test_decode_color >actual &&
 
 	cat <<-\EOF >expected &&
 	<BOLD>diff --git a/text.txt b/text.txt<RESET>
 	<BOLD>--- a/text.txt<RESET>
 	<BOLD>+++ b/text.txt<RESET>
 	<CYAN>@@ -1,16 +1,16 @@<RESET>
-	<BOLD;MAGENTA>-<RESET>
-	<BOLD;MAGENTA>-<RESET><BOLD;MAGENTA>    too short without<RESET>
-	<BOLD;MAGENTA>-<RESET>
+	<BOLD;MAGENTA>-<RESET><BOLD;MAGENTA>^<RESET><BRED>  <RESET>
+	<BOLD;MAGENTA>-<RESET><BOLD;MAGENTA>|    too short without<RESET>
+	<BOLD;MAGENTA>-<RESET><BOLD;MAGENTA>^<RESET>
 	<BOLD;MAGENTA>-<RESET><BOLD;MAGENTA>   being grouped across blank line<RESET>
 	<BOLD;MAGENTA>-<RESET>
 	 <RESET>context<RESET>
@@ -2039,7 +2325,7 @@ test_expect_success 'compare mixed whitespace delta across moved blocks' '
 	<BOLD;YELLOW>+<RESET>
 	<BOLD;YELLOW>+<RESET>		<BOLD;YELLOW>too short without<RESET>
 	<BOLD;YELLOW>+<RESET>
-	<BOLD;YELLOW>+<RESET>	<BOLD;YELLOW>       being grouped across blank line<RESET>
+	<BOLD;YELLOW>+<RESET><BOLD;YELLOW>^	       being grouped across blank line<RESET>
 	<BOLD;YELLOW>+<RESET>
 	<BOLD;CYAN>+<RESET>	<BRED> <RESET>	<BOLD;CYAN>These two lines have had their<RESET>
 	<BOLD;CYAN>+<RESET><BOLD;CYAN>indentation reduced by four spaces<RESET>
diff --git a/t/t4016-diff-quote.sh b/t/t4016-diff-quote.sh
index 9c48e5c..5a8d887 100755
--- a/t/t4016-diff-quote.sh
+++ b/t/t4016-diff-quote.sh
@@ -6,6 +6,7 @@
 test_description='Quoting paths in diff output.
 '
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 P0='pathname'
@@ -82,7 +83,7 @@ test_expect_success 'git diff --stat -M HEAD' '
 	 7 files changed, 0 insertions(+), 0 deletions(-)
 	EOF
 	git diff --stat -M HEAD >actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 test_done
diff --git a/t/t4017-diff-retval.sh b/t/t4017-diff-retval.sh
index 95a7ca7..f439f46 100755
--- a/t/t4017-diff-retval.sh
+++ b/t/t4017-diff-retval.sh
@@ -2,6 +2,10 @@
 
 test_description='Return value of diffs'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -111,7 +115,7 @@ test_expect_success 'check detects leftover conflict markers' '
 	git checkout HEAD^ &&
 	echo binary >>b &&
 	git commit -m "side" b &&
-	test_must_fail git merge master &&
+	test_must_fail git merge main &&
 	git add b &&
 	test_expect_code 2 git --no-pager diff --cached --check >test.out &&
 	test 3 = $(grep "conflict marker" test.out | wc -l) &&
@@ -134,4 +138,9 @@ test_expect_success 'check honors conflict marker length' '
 	git reset --hard
 '
 
+test_expect_success 'option errors are not confused by --exit-code' '
+	test_must_fail git diff --exit-code --nonsense 2>err &&
+	grep '^usage:' err
+'
+
 test_done
diff --git a/t/t4018-diff-funcname.sh b/t/t4018-diff-funcname.sh
index 9d07797..e026fac 100755
--- a/t/t4018-diff-funcname.sh
+++ b/t/t4018-diff-funcname.sh
@@ -25,32 +25,26 @@ test_expect_success 'setup' '
 	echo B >B.java
 '
 
+test_expect_success 'setup: test-tool userdiff' '
+	# Make sure additions to builtin_drivers are sorted
+	test_when_finished "rm builtin-drivers.sorted" &&
+	test-tool userdiff list-builtin-drivers >builtin-drivers &&
+	test_file_not_empty builtin-drivers &&
+	sort <builtin-drivers >builtin-drivers.sorted &&
+	test_cmp builtin-drivers.sorted builtin-drivers &&
+
+	# Ditto, but "custom" requires the .git directory and config
+	# to be setup and read.
+	test_when_finished "rm custom-drivers.sorted" &&
+	test-tool userdiff list-custom-drivers >custom-drivers &&
+	test_file_not_empty custom-drivers &&
+	sort <custom-drivers >custom-drivers.sorted &&
+	test_cmp custom-drivers.sorted custom-drivers
+'
+
 diffpatterns="
-	ada
-	bibtex
-	cpp
-	csharp
-	css
-	dts
-	elixir
-	fortran
-	fountain
-	golang
-	html
-	java
-	markdown
-	matlab
-	objc
-	pascal
-	perl
-	php
-	python
-	ruby
-	rust
-	tex
-	custom1
-	custom2
-	custom3
+	$(cat builtin-drivers)
+	$(cat custom-drivers)
 "
 
 for p in $diffpatterns
@@ -59,15 +53,34 @@ do
 		echo "*.java diff=$p" >.gitattributes &&
 		test_expect_code 1 git diff --no-index \
 			A.java B.java 2>msg &&
-		test_i18ngrep ! fatal msg &&
-		test_i18ngrep ! error msg
+		test_grep ! fatal msg &&
+		test_grep ! error msg
 	'
 	test_expect_success "builtin $p wordRegex pattern compiles" '
 		echo "*.java diff=$p" >.gitattributes &&
 		test_expect_code 1 git diff --no-index --word-diff \
 			A.java B.java 2>msg &&
-		test_i18ngrep ! fatal msg &&
-		test_i18ngrep ! error msg
+		test_grep ! fatal msg &&
+		test_grep ! error msg
+	'
+
+	test_expect_success "builtin $p pattern compiles on bare repo with --attr-source" '
+		test_when_finished "rm -rf bare.git" &&
+		git checkout -B master &&
+		git add . &&
+		echo "*.java diff=notexist" >.gitattributes &&
+		git add .gitattributes &&
+		git commit -am "changing gitattributes" &&
+		git checkout -B branchA &&
+		echo "*.java diff=$p" >.gitattributes &&
+		git add .gitattributes &&
+		git commit -am "changing gitattributes" &&
+		git clone --bare --no-local . bare.git &&
+		git -C bare.git symbolic-ref HEAD refs/heads/master &&
+		test_expect_code 1 git -C bare.git --attr-source=branchA \
+			diff --exit-code HEAD:A.java HEAD:B.java 2>msg &&
+		test_grep ! fatal msg &&
+		test_grep ! error msg
 	'
 done
 
@@ -75,13 +88,13 @@ test_expect_success 'last regexp must not be negated' '
 	echo "*.java diff=java" >.gitattributes &&
 	test_config diff.java.funcname "!static" &&
 	test_expect_code 128 git diff --no-index A.java B.java 2>msg &&
-	test_i18ngrep ": Last expression must not be negated:" msg
+	test_grep ": Last expression must not be negated:" msg
 '
 
 test_expect_success 'setup hunk header tests' '
 	for i in $diffpatterns
 	do
-		echo "$i-* diff=$i"
+		echo "$i-* diff=$i" || return 1
 	done > .gitattributes &&
 
 	# add all test files to the index
@@ -100,13 +113,7 @@ test_expect_success 'setup hunk header tests' '
 # check each individual file
 for i in $(git ls-files)
 do
-	if grep broken "$i" >/dev/null 2>&1
-	then
-		result=failure
-	else
-		result=success
-	fi
-	test_expect_$result "hunk header: $i" "
+	test_expect_success "hunk header: $i" "
 		git diff -U1 $i >actual &&
 		grep '@@ .* @@.*RIGHT' actual
 	"
diff --git a/t/t4018/README b/t/t4018/README
index 283e01cc..2d25b2b 100644
--- a/t/t4018/README
+++ b/t/t4018/README
@@ -7,9 +7,6 @@ at least two lines from the line that must appear in the hunk header.
 The text that must appear in the hunk header must contain the word
 "right", but in all upper-case, like in the title above.
 
-To mark a test case that highlights a malfunction, insert the word
-BROKEN in all lower-case somewhere in the file.
-
 This text is a bit twisted and out of order, but it is itself a
 test case for the default hunk header pattern. Know what you are doing
 if you change it.
diff --git a/t/t4018/bash-arithmetic-function b/t/t4018/bash-arithmetic-function
new file mode 100644
index 0000000..c0b276c
--- /dev/null
+++ b/t/t4018/bash-arithmetic-function
@@ -0,0 +1,4 @@
+RIGHT() ((
+
+    ChangeMe = "$x" + "$y"
+))
diff --git a/t/t4018/bash-bashism-style-compact b/t/t4018/bash-bashism-style-compact
new file mode 100644
index 0000000..1ca3126
--- /dev/null
+++ b/t/t4018/bash-bashism-style-compact
@@ -0,0 +1,6 @@
+function RIGHT {
+    function InvalidSyntax{
+        :
+        echo 'ChangeMe'
+    }
+}
diff --git a/t/t4018/bash-bashism-style-function b/t/t4018/bash-bashism-style-function
new file mode 100644
index 0000000..f1de4fa
--- /dev/null
+++ b/t/t4018/bash-bashism-style-function
@@ -0,0 +1,4 @@
+function RIGHT {
+    :
+    echo 'ChangeMe'
+}
diff --git a/t/t4018/bash-bashism-style-whitespace b/t/t4018/bash-bashism-style-whitespace
new file mode 100644
index 0000000..ade85dd
--- /dev/null
+++ b/t/t4018/bash-bashism-style-whitespace
@@ -0,0 +1,4 @@
+	 function 	RIGHT 	( 	) 	{
+
+	    ChangeMe
+	 }
diff --git a/t/t4018/bash-conditional-function b/t/t4018/bash-conditional-function
new file mode 100644
index 0000000..c5949e8
--- /dev/null
+++ b/t/t4018/bash-conditional-function
@@ -0,0 +1,4 @@
+RIGHT() [[ \
+
+    "$a" > "$ChangeMe"
+]]
diff --git a/t/t4018/bash-missing-parentheses b/t/t4018/bash-missing-parentheses
new file mode 100644
index 0000000..8c8a05d
--- /dev/null
+++ b/t/t4018/bash-missing-parentheses
@@ -0,0 +1,6 @@
+function RIGHT {
+    functionInvalidSyntax {
+        :
+        echo 'ChangeMe'
+    }
+}
diff --git a/t/t4018/bash-mixed-style-compact b/t/t4018/bash-mixed-style-compact
new file mode 100644
index 0000000..d9364cb
--- /dev/null
+++ b/t/t4018/bash-mixed-style-compact
@@ -0,0 +1,4 @@
+function RIGHT(){
+    :
+    echo 'ChangeMe'
+}
diff --git a/t/t4018/bash-mixed-style-function b/t/t4018/bash-mixed-style-function
new file mode 100644
index 0000000..555f9b2
--- /dev/null
+++ b/t/t4018/bash-mixed-style-function
@@ -0,0 +1,4 @@
+function RIGHT() {
+
+    ChangeMe
+}
diff --git a/t/t4018/bash-nested-functions b/t/t4018/bash-nested-functions
new file mode 100644
index 0000000..2c9237e
--- /dev/null
+++ b/t/t4018/bash-nested-functions
@@ -0,0 +1,6 @@
+outer() {
+    RIGHT() {
+        :
+        echo 'ChangeMe'
+    }
+}
diff --git a/t/t4018/bash-other-characters b/t/t4018/bash-other-characters
new file mode 100644
index 0000000..a3f390d
--- /dev/null
+++ b/t/t4018/bash-other-characters
@@ -0,0 +1,4 @@
+_RIGHT_0n() {
+
+    ChangeMe
+}
diff --git a/t/t4018/bash-posix-style-compact b/t/t4018/bash-posix-style-compact
new file mode 100644
index 0000000..045bd20
--- /dev/null
+++ b/t/t4018/bash-posix-style-compact
@@ -0,0 +1,4 @@
+RIGHT(){
+
+    ChangeMe
+}
diff --git a/t/t4018/bash-posix-style-function b/t/t4018/bash-posix-style-function
new file mode 100644
index 0000000..a4d1448
--- /dev/null
+++ b/t/t4018/bash-posix-style-function
@@ -0,0 +1,4 @@
+RIGHT() {
+
+    ChangeMe
+}
diff --git a/t/t4018/bash-posix-style-whitespace b/t/t4018/bash-posix-style-whitespace
new file mode 100644
index 0000000..4d984f0
--- /dev/null
+++ b/t/t4018/bash-posix-style-whitespace
@@ -0,0 +1,4 @@
+	 RIGHT 	( 	) 	{
+
+	    ChangeMe
+	 }
diff --git a/t/t4018/bash-subshell-function b/t/t4018/bash-subshell-function
new file mode 100644
index 0000000..80baa09
--- /dev/null
+++ b/t/t4018/bash-subshell-function
@@ -0,0 +1,4 @@
+RIGHT() (
+
+    ChangeMe=2
+)
diff --git a/t/t4018/bash-trailing-comment b/t/t4018/bash-trailing-comment
new file mode 100644
index 0000000..f1edbed
--- /dev/null
+++ b/t/t4018/bash-trailing-comment
@@ -0,0 +1,4 @@
+RIGHT() { # Comment
+
+    ChangeMe
+}
diff --git a/t/t4018/csharp-exclude-assignments b/t/t4018/csharp-exclude-assignments
new file mode 100644
index 0000000..239f312
--- /dev/null
+++ b/t/t4018/csharp-exclude-assignments
@@ -0,0 +1,20 @@
+class Example
+{
+    string Method(int RIGHT)
+    {
+        var constantAssignment = "test";
+        var methodAssignment = MethodCall();
+        var multiLineMethodAssignment = MethodCall(
+        );
+        var multiLine = "first"
+            + MethodCall()
+            +
+            ( MethodCall()
+            )
+            + MethodCall();
+
+        return "ChangeMe";
+    }
+
+    string MethodCall(int a = 0, int b = 0) => "test";
+}
diff --git a/t/t4018/csharp-exclude-control-statements b/t/t4018/csharp-exclude-control-statements
new file mode 100644
index 0000000..3a0f404
--- /dev/null
+++ b/t/t4018/csharp-exclude-control-statements
@@ -0,0 +1,34 @@
+class Example
+{
+    string Method(int RIGHT)
+    {
+        if (false)
+        {
+            return "out";
+        }
+        else { }
+        if (true) MethodCall(
+        );
+        else MethodCall(
+        );
+        switch ("test")
+        {
+            case "one":
+            return MethodCall(
+            );
+            case "two":
+            break;
+        }
+        (int, int) tuple = (1, 4);
+        switch (tuple)
+        {
+            case (1, 4):
+              MethodCall();
+		      break;
+        }
+
+        return "ChangeMe";
+    }
+
+    string MethodCall(int a = 0, int b = 0) => "test";
+}
diff --git a/t/t4018/csharp-exclude-exceptions b/t/t4018/csharp-exclude-exceptions
new file mode 100644
index 0000000..b1e6425
--- /dev/null
+++ b/t/t4018/csharp-exclude-exceptions
@@ -0,0 +1,29 @@
+using System;
+
+class Example
+{
+    string Method(int RIGHT)
+    {
+        try
+        {
+            throw new Exception("fail");
+        }
+        catch (Exception)
+        {
+        }
+        finally
+        {
+        }
+        try { } catch (Exception) {}
+        try
+        {
+            throw GetException(
+            );
+        }
+        catch (Exception) { }
+
+        return "ChangeMe";
+    }
+
+    Exception GetException() => new Exception("fail");
+}
diff --git a/t/t4018/csharp-exclude-generic-method-calls b/t/t4018/csharp-exclude-generic-method-calls
new file mode 100644
index 0000000..31af546
--- /dev/null
+++ b/t/t4018/csharp-exclude-generic-method-calls
@@ -0,0 +1,12 @@
+class Example
+{
+    string Method(int RIGHT)
+    {
+        GenericMethodCall<int, int>(
+            );
+
+        return "ChangeMe";
+    }
+
+    string GenericMethodCall<T, T2>() => "test";
+}
diff --git a/t/t4018/csharp-exclude-init-dispose b/t/t4018/csharp-exclude-init-dispose
new file mode 100644
index 0000000..2bc8e19
--- /dev/null
+++ b/t/t4018/csharp-exclude-init-dispose
@@ -0,0 +1,22 @@
+using System;
+
+class Example : IDisposable
+{
+    string Method(int RIGHT)
+    {
+        new Example();
+        new Example(
+            );
+        new Example { };
+        using (this)
+        {
+        }
+        var def =
+            this is default(
+                Example);
+
+        return "ChangeMe";
+    }
+
+    public void Dispose() {}
+}
diff --git a/t/t4018/csharp-exclude-iterations b/t/t4018/csharp-exclude-iterations
new file mode 100644
index 0000000..960aa18
--- /dev/null
+++ b/t/t4018/csharp-exclude-iterations
@@ -0,0 +1,26 @@
+using System.Linq;
+
+class Example
+{
+    string Method(int RIGHT)
+    {
+        do { } while (true);
+        do MethodCall(
+        ); while (true);
+        while (true);
+        while (true) {
+            break;
+        }
+        for (int i = 0; i < 10; ++i)
+        {
+        }
+        foreach (int i in Enumerable.Range(0, 10))
+        {
+        }
+        int[] numbers = [5, 4, 1, 3, 9, 8, 6, 7, 2, 0];
+
+        return "ChangeMe";
+    }
+
+    string MethodCall(int a = 0, int b = 0) => "test";
+}
diff --git a/t/t4018/csharp-exclude-method-calls b/t/t4018/csharp-exclude-method-calls
new file mode 100644
index 0000000..51e2dc2
--- /dev/null
+++ b/t/t4018/csharp-exclude-method-calls
@@ -0,0 +1,20 @@
+class Example
+{
+    string Method(int RIGHT)
+    {
+        MethodCall();
+        MethodCall(1, 2);
+        MethodCall(
+            1, 2);
+        MethodCall(
+            1, 2,
+            3);
+        MethodCall(
+            1, MethodCall(),
+            2);
+
+        return "ChangeMe";
+    }
+
+    int MethodCall(int a = 0, int b = 0, int c = 0) => 42;
+}
diff --git a/t/t4018/csharp-exclude-other b/t/t4018/csharp-exclude-other
new file mode 100644
index 0000000..4d5581c
--- /dev/null
+++ b/t/t4018/csharp-exclude-other
@@ -0,0 +1,18 @@
+class Example
+{
+    string Method(int RIGHT)
+    {
+        lock (this)
+        {
+        }
+        unsafe
+        {
+            byte[] bytes = [1, 2, 3];
+            fixed (byte* pointerToFirst = bytes)
+            {
+            }
+        }
+
+        return "ChangeMe";
+    }
+}
diff --git a/t/t4018/csharp-method b/t/t4018/csharp-method
new file mode 100644
index 0000000..16b367a
--- /dev/null
+++ b/t/t4018/csharp-method
@@ -0,0 +1,10 @@
+class Example
+{
+    string Method(int RIGHT)
+    {
+        // Filler
+        // Filler
+
+        return "ChangeMe";
+    }
+}
diff --git a/t/t4018/csharp-method-array b/t/t4018/csharp-method-array
new file mode 100644
index 0000000..1126de8
--- /dev/null
+++ b/t/t4018/csharp-method-array
@@ -0,0 +1,10 @@
+class Example
+{
+    string[] Method(int RIGHT)
+    {
+        // Filler
+        // Filler
+
+        return ["ChangeMe"];
+    }
+}
diff --git a/t/t4018/csharp-method-explicit b/t/t4018/csharp-method-explicit
new file mode 100644
index 0000000..5a71011
--- /dev/null
+++ b/t/t4018/csharp-method-explicit
@@ -0,0 +1,12 @@
+using System;
+
+class Example : IDisposable
+{
+    void IDisposable.Dispose() // RIGHT
+    {
+        // Filler
+        // Filler
+        
+        // ChangeMe
+    }
+}
diff --git a/t/t4018/csharp-method-generics b/t/t4018/csharp-method-generics
new file mode 100644
index 0000000..b3216bf
--- /dev/null
+++ b/t/t4018/csharp-method-generics
@@ -0,0 +1,11 @@
+class Example<T1, T2>
+{
+    Example<int, string> Method<TA, TB>(TA RIGHT, TB b)
+    {
+        // Filler
+        // Filler
+        
+        // ChangeMe
+        return null;
+    }
+}
diff --git a/t/t4018/csharp-method-generics-alternate-spaces b/t/t4018/csharp-method-generics-alternate-spaces
new file mode 100644
index 0000000..9583621
--- /dev/null
+++ b/t/t4018/csharp-method-generics-alternate-spaces
@@ -0,0 +1,11 @@
+class Example<T1, T2>
+{
+    Example<int,string> Method<TA ,TB>(TA RIGHT, TB b)
+    {
+        // Filler
+        // Filler
+        
+        // ChangeMe
+        return null;
+    }
+}
diff --git a/t/t4018/csharp-method-modifiers b/t/t4018/csharp-method-modifiers
new file mode 100644
index 0000000..caefa8e
--- /dev/null
+++ b/t/t4018/csharp-method-modifiers
@@ -0,0 +1,13 @@
+using System.Threading.Tasks;
+
+class Example
+{
+    static internal async Task Method(int RIGHT)
+    {
+        // Filler
+        // Filler
+        
+        // ChangeMe
+        await Task.Delay(1);
+    }
+}
diff --git a/t/t4018/csharp-method-multiline b/t/t4018/csharp-method-multiline
new file mode 100644
index 0000000..3983ff4
--- /dev/null
+++ b/t/t4018/csharp-method-multiline
@@ -0,0 +1,10 @@
+class Example
+{
+    string Method_RIGHT(
+        int a,
+        int b,
+        int c)
+    {
+        return "ChangeMe";
+    }
+}
diff --git a/t/t4018/csharp-method-params b/t/t4018/csharp-method-params
new file mode 100644
index 0000000..3f00410
--- /dev/null
+++ b/t/t4018/csharp-method-params
@@ -0,0 +1,10 @@
+class Example
+{
+    string Method(int RIGHT, int b, int c = 42)
+    {
+        // Filler
+        // Filler
+        
+        return "ChangeMe";
+    }
+}
diff --git a/t/t4018/csharp-method-special-chars b/t/t4018/csharp-method-special-chars
new file mode 100644
index 0000000..e6c7bc0
--- /dev/null
+++ b/t/t4018/csharp-method-special-chars
@@ -0,0 +1,11 @@
+class @Some_Type
+{
+    @Some_Type @Method_With_Underscore(int RIGHT)
+    {
+        // Filler
+        // Filler
+        
+        // ChangeMe
+        return new @Some_Type();
+    }
+}
diff --git a/t/t4018/csharp-method-with-spacing b/t/t4018/csharp-method-with-spacing
new file mode 100644
index 0000000..233bb97
--- /dev/null
+++ b/t/t4018/csharp-method-with-spacing
@@ -0,0 +1,10 @@
+class Example
+{
+    	string   Method 	( int 	RIGHT )
+    {
+        // Filler
+        // Filler
+
+        return "ChangeMe";
+    }
+}
diff --git a/t/t4018/csharp-property b/t/t4018/csharp-property
new file mode 100644
index 0000000..e56dfce3
--- /dev/null
+++ b/t/t4018/csharp-property
@@ -0,0 +1,11 @@
+class Example
+{
+    public bool RIGHT
+    {
+        get { return true; }
+        set
+        {
+            // ChangeMe
+        }
+    }
+}
diff --git a/t/t4018/csharp-property-braces-same-line b/t/t4018/csharp-property-braces-same-line
new file mode 100644
index 0000000..608131d
--- /dev/null
+++ b/t/t4018/csharp-property-braces-same-line
@@ -0,0 +1,10 @@
+class Example
+{
+    public bool RIGHT {
+        get { return true; }
+        set
+        {
+            // ChangeMe
+        }
+    }
+}
diff --git a/t/t4018/css-attribute-value-selector b/t/t4018/css-attribute-value-selector
new file mode 100644
index 0000000..918256b
--- /dev/null
+++ b/t/t4018/css-attribute-value-selector
@@ -0,0 +1,4 @@
+[class*="RIGHT"] {
+    background : #000;
+    border : 10px ChangeMe #C6C6C6;
+}
diff --git a/t/t4018/css-block-level-@-statements b/t/t4018/css-block-level-@-statements
new file mode 100644
index 0000000..d6755f2
--- /dev/null
+++ b/t/t4018/css-block-level-@-statements
@@ -0,0 +1,10 @@
+@keyframes RIGHT {
+    from {
+        background : #000;
+        border : 10px ChangeMe #C6C6C6;
+    }
+    to {
+        background : #fff;
+        border : 10px solid #C6C6C6;
+    }
+}
diff --git a/t/t4018/css-class-selector b/t/t4018/css-class-selector
new file mode 100644
index 0000000..f790a00
--- /dev/null
+++ b/t/t4018/css-class-selector
@@ -0,0 +1,4 @@
+.RIGHT {
+    background : #000;
+    border : 10px ChangeMe #C6C6C6;
+}
diff --git a/t/t4018/css-id-selector b/t/t4018/css-id-selector
new file mode 100644
index 0000000..17c5111
--- /dev/null
+++ b/t/t4018/css-id-selector
@@ -0,0 +1,4 @@
+#RIGHT {
+    background : #000;
+    border : 10px ChangeMe #C6C6C6;
+}
diff --git a/t/t4018/css-root-selector b/t/t4018/css-root-selector
new file mode 100644
index 0000000..22b958e
--- /dev/null
+++ b/t/t4018/css-root-selector
@@ -0,0 +1,4 @@
+:RIGHT {
+    background : #000;
+    border : 10px ChangeMe #C6C6C6;
+}
diff --git a/t/t4018/fortran-block-data b/t/t4018/fortran-block-data
new file mode 100644
index 0000000..63d4e21
--- /dev/null
+++ b/t/t4018/fortran-block-data
@@ -0,0 +1,5 @@
+       BLOCK DATA RIGHT
+       
+       COMMON /B/ C, ChangeMe
+       DATA C, ChangeMe  / 2.0, 6.0 / 
+       END 
diff --git a/t/t4018/fortran-comment b/t/t4018/fortran-comment
new file mode 100644
index 0000000..7b10d17
--- /dev/null
+++ b/t/t4018/fortran-comment
@@ -0,0 +1,13 @@
+      module a
+
+      contains
+
+      ! subroutine wrong
+      subroutine RIGHT
+      ! subroutine wrong
+
+      real ChangeMe
+
+      end subroutine RIGHT
+
+      end module a
diff --git a/t/t4018/fortran-comment-keyword b/t/t4018/fortran-comment-keyword
new file mode 100644
index 0000000..e9206a5
--- /dev/null
+++ b/t/t4018/fortran-comment-keyword
@@ -0,0 +1,14 @@
+      module a
+
+      contains
+
+      subroutine RIGHT (funcA, funcB)
+
+      real funcA  ! grid function a
+      real funcB  ! grid function b
+
+      real ChangeMe
+
+      end subroutine RIGHT
+
+      end module a
diff --git a/t/t4018/fortran-comment-legacy b/t/t4018/fortran-comment-legacy
new file mode 100644
index 0000000..53cd062
--- /dev/null
+++ b/t/t4018/fortran-comment-legacy
@@ -0,0 +1,13 @@
+      module a
+
+      contains
+
+C subroutine wrong
+      subroutine RIGHT
+C subroutine wrong
+
+      real ChangeMe
+
+      end subroutine RIGHT
+
+      end module a
diff --git a/t/t4018/fortran-comment-legacy-star b/t/t4018/fortran-comment-legacy-star
new file mode 100644
index 0000000..2cbcdc3
--- /dev/null
+++ b/t/t4018/fortran-comment-legacy-star
@@ -0,0 +1,13 @@
+      module a
+
+      contains
+
+* subroutine wrong
+      subroutine RIGHT
+* subroutine wrong
+
+      real ChangeMe
+
+      end subroutine RIGHT
+
+      end module a
diff --git a/t/t4018/fortran-external-function b/t/t4018/fortran-external-function
new file mode 100644
index 0000000..5a2d85d
--- /dev/null
+++ b/t/t4018/fortran-external-function
@@ -0,0 +1,9 @@
+function RIGHT(a, b) result(c)
+
+integer, intent(in) :: ChangeMe
+integer, intent(in) :: b
+integer, intent(out) :: c
+
+c = a+b
+
+end function RIGHT
diff --git a/t/t4018/fortran-external-subroutine b/t/t4018/fortran-external-subroutine
new file mode 100644
index 0000000..4ce85fe
--- /dev/null
+++ b/t/t4018/fortran-external-subroutine
@@ -0,0 +1,5 @@
+subroutine RIGHT
+
+real ChangeMe
+
+end subroutine RIGHT
diff --git a/t/t4018/fortran-module b/t/t4018/fortran-module
new file mode 100644
index 0000000..c4b737d
--- /dev/null
+++ b/t/t4018/fortran-module
@@ -0,0 +1,5 @@
+module RIGHT
+
+use ChangeMe
+
+end module RIGHT
diff --git a/t/t4018/fortran-module-procedure b/t/t4018/fortran-module-procedure
new file mode 100644
index 0000000..1ce6d85
--- /dev/null
+++ b/t/t4018/fortran-module-procedure
@@ -0,0 +1,13 @@
+ module RIGHT
+
+   implicit none
+   private
+
+   interface letters  ! generic interface
+      module procedure aaaa, &
+                       bbbb, &
+                       ChangeMe, &
+                       dddd
+   end interface
+   
+end module RIGHT
diff --git a/t/t4018/fortran-program b/t/t4018/fortran-program
new file mode 100644
index 0000000..4616895
--- /dev/null
+++ b/t/t4018/fortran-program
@@ -0,0 +1,5 @@
+program RIGHT
+
+call ChangeMe
+
+end program RIGHT
diff --git a/t/t4018/java-class-brace-on-separate-line b/t/t4018/java-class-brace-on-separate-line
new file mode 100644
index 0000000..8795acd
--- /dev/null
+++ b/t/t4018/java-class-brace-on-separate-line
@@ -0,0 +1,6 @@
+class RIGHT
+{
+    static int ONE;
+    static int TWO;
+    static int ChangeMe;
+}
diff --git a/t/t4018/java-class-member-function b/t/t4018/java-class-member-function
index 298bc7a..3b95f68 100644
--- a/t/t4018/java-class-member-function
+++ b/t/t4018/java-class-member-function
@@ -3,6 +3,10 @@ public class Beer
 	int special;
 	public static void main(String RIGHT[])
 	{
+		someMethodCall();
+		someOtherMethod("17")
+			.doThat();
+		// Whatever
 		System.out.print("ChangeMe");
 	}
 }
diff --git a/t/t4018/java-class-space-before-type-parameters b/t/t4018/java-class-space-before-type-parameters
new file mode 100644
index 0000000..0bdef1d
--- /dev/null
+++ b/t/t4018/java-class-space-before-type-parameters
@@ -0,0 +1,6 @@
+class RIGHT <TYPE, PARAMS, AFTER, SPACE> {
+    static int ONE;
+    static int TWO;
+    static int THREE;
+    private A ChangeMe;
+}
diff --git a/t/t4018/java-class-type-parameters b/t/t4018/java-class-type-parameters
new file mode 100644
index 0000000..579aa7a
--- /dev/null
+++ b/t/t4018/java-class-type-parameters
@@ -0,0 +1,6 @@
+class RIGHT<A, B> {
+    static int ONE;
+    static int TWO;
+    static int THREE;
+    private A ChangeMe;
+}
diff --git a/t/t4018/java-class-type-parameters-implements b/t/t4018/java-class-type-parameters-implements
new file mode 100644
index 0000000..b8038b1
--- /dev/null
+++ b/t/t4018/java-class-type-parameters-implements
@@ -0,0 +1,6 @@
+class RIGHT<A, B> implements List<A> {
+    static int ONE;
+    static int TWO;
+    static int THREE;
+    private A ChangeMe;
+}
diff --git a/t/t4018/java-enum-constant b/t/t4018/java-enum-constant
new file mode 100644
index 0000000..a1931c8
--- /dev/null
+++ b/t/t4018/java-enum-constant
@@ -0,0 +1,6 @@
+private enum RIGHT {
+    ONE,
+    TWO,
+    THREE,
+    ChangeMe
+}
diff --git a/t/t4018/java-interface-type-parameters b/t/t4018/java-interface-type-parameters
new file mode 100644
index 0000000..a4baa1a
--- /dev/null
+++ b/t/t4018/java-interface-type-parameters
@@ -0,0 +1,6 @@
+interface RIGHT<A, B> {
+    static int ONE;
+    static int TWO;
+    static int THREE;
+    public B foo(A ChangeMe);
+}
diff --git a/t/t4018/java-interface-type-parameters-extends b/t/t4018/java-interface-type-parameters-extends
new file mode 100644
index 0000000..31d7fb3
--- /dev/null
+++ b/t/t4018/java-interface-type-parameters-extends
@@ -0,0 +1,6 @@
+interface RIGHT<A, B> extends Function<A, B> {
+    static int ONE;
+    static int TWO;
+    static int THREE;
+    public B foo(A ChangeMe);
+}
diff --git a/t/t4018/java-method-return-generic-bounded b/t/t4018/java-method-return-generic-bounded
new file mode 100644
index 0000000..66dd78c
--- /dev/null
+++ b/t/t4018/java-method-return-generic-bounded
@@ -0,0 +1,9 @@
+class MyExample {
+    public <T extends Bar & Foo<T>, R> Map<T, R[]> foo(String[] RIGHT) {
+        someMethodCall();
+        someOtherMethod()
+            .doThat();
+        // Whatever...
+        return (List<T>) Arrays.asList("ChangeMe");
+    }
+}
diff --git a/t/t4018/java-method-return-generic-wildcard b/t/t4018/java-method-return-generic-wildcard
new file mode 100644
index 0000000..96e9e5f
--- /dev/null
+++ b/t/t4018/java-method-return-generic-wildcard
@@ -0,0 +1,9 @@
+class MyExample {
+    public List<? extends Comparable> foo(String[] RIGHT) {
+        someMethodCall();
+        someOtherMethod()
+            .doThat();
+        // Whatever...
+        return Arrays.asList("ChangeMe");
+    }
+}
diff --git a/t/t4018/java-nested-field b/t/t4018/java-nested-field
new file mode 100644
index 0000000..d92d3ec
--- /dev/null
+++ b/t/t4018/java-nested-field
@@ -0,0 +1,6 @@
+class MyExample {
+    private static class RIGHT {
+        // change an inner class field
+        String inner = "ChangeMe";
+    }
+}
diff --git a/t/t4018/java-non-sealed b/t/t4018/java-non-sealed
new file mode 100644
index 0000000..069087c
--- /dev/null
+++ b/t/t4018/java-non-sealed
@@ -0,0 +1,8 @@
+public abstract sealed class SealedClass {
+    public static non-sealed class RIGHT extends SealedClass {
+        static int ONE;
+        static int TWO;
+        static int THREE;
+        private int ChangeMe;
+    }
+}
diff --git a/t/t4018/java-record b/t/t4018/java-record
new file mode 100644
index 0000000..97aa819
--- /dev/null
+++ b/t/t4018/java-record
@@ -0,0 +1,6 @@
+public record RIGHT(int comp1, double comp2, String comp3) {
+    static int ONE;
+    static int TWO;
+    static int THREE;
+    static int ChangeMe;
+}
diff --git a/t/t4018/java-record-space-before-components b/t/t4018/java-record-space-before-components
new file mode 100644
index 0000000..9827f22
--- /dev/null
+++ b/t/t4018/java-record-space-before-components
@@ -0,0 +1,6 @@
+public record RIGHT (String components, String after, String space) {
+    static int ONE;
+    static int TWO;
+    static int THREE;
+    static int ChangeMe;
+}
diff --git a/t/t4018/java-record-type-parameters b/t/t4018/java-record-type-parameters
new file mode 100644
index 0000000..f62a035
--- /dev/null
+++ b/t/t4018/java-record-type-parameters
@@ -0,0 +1,6 @@
+public record RIGHT<A, N extends Number>(A comp1, N comp2, int comp3) {
+    static int ONE;
+    static int TWO;
+    static int THREE;
+    static int ChangeMe;
+}
diff --git a/t/t4018/java-sealed b/t/t4018/java-sealed
new file mode 100644
index 0000000..785fbc6
--- /dev/null
+++ b/t/t4018/java-sealed
@@ -0,0 +1,7 @@
+public abstract sealed class Sealed { // RIGHT
+    static int ONE;
+    static int TWO;
+    static int THREE;
+    public final class ChangeMe extends Sealed {
+    }
+}
diff --git a/t/t4018/java-sealed-permits b/t/t4018/java-sealed-permits
new file mode 100644
index 0000000..18dd489
--- /dev/null
+++ b/t/t4018/java-sealed-permits
@@ -0,0 +1,6 @@
+public abstract sealed class RIGHT permits PermittedA, PermittedB {
+    static int ONE;
+    static int TWO;
+    static int THREE;
+    private int ChangeMe;
+}
diff --git a/t/t4018/java-sealed-type-parameters b/t/t4018/java-sealed-type-parameters
new file mode 100644
index 0000000..e6530c4
--- /dev/null
+++ b/t/t4018/java-sealed-type-parameters
@@ -0,0 +1,6 @@
+public abstract sealed class RIGHT<A, B> {
+    static int ONE;
+    static int TWO;
+    static int THREE;
+    private int ChangeMe;
+}
diff --git a/t/t4018/java-sealed-type-parameters-implements-permits b/t/t4018/java-sealed-type-parameters-implements-permits
new file mode 100644
index 0000000..bd6e6d3
--- /dev/null
+++ b/t/t4018/java-sealed-type-parameters-implements-permits
@@ -0,0 +1,6 @@
+public abstract sealed class RIGHT<A, B> implements List<A> permits PermittedA, PermittedB {
+    static int ONE;
+    static int TWO;
+    static int THREE;
+    private int ChangeMe;
+}
diff --git a/t/t4018/java-sealed-type-parameters-permits b/t/t4018/java-sealed-type-parameters-permits
new file mode 100644
index 0000000..25a0da6
--- /dev/null
+++ b/t/t4018/java-sealed-type-parameters-permits
@@ -0,0 +1,6 @@
+public abstract sealed class RIGHT<A, B> permits PermittedA, PermittedB {
+    static int ONE;
+    static int TWO;
+    static int THREE;
+    private int ChangeMe;
+}
diff --git a/t/t4018/kotlin-class b/t/t4018/kotlin-class
new file mode 100644
index 0000000..bb864f2
--- /dev/null
+++ b/t/t4018/kotlin-class
@@ -0,0 +1,5 @@
+class RIGHT {
+	//comment
+	//comment
+	return ChangeMe
+}
diff --git a/t/t4018/kotlin-enum-class b/t/t4018/kotlin-enum-class
new file mode 100644
index 0000000..8885f90
--- /dev/null
+++ b/t/t4018/kotlin-enum-class
@@ -0,0 +1,5 @@
+enum class RIGHT{
+	// Left
+	// a comment
+	ChangeMe
+}
diff --git a/t/t4018/kotlin-fun b/t/t4018/kotlin-fun
new file mode 100644
index 0000000..2a60280
--- /dev/null
+++ b/t/t4018/kotlin-fun
@@ -0,0 +1,5 @@
+fun RIGHT(){
+	//a comment
+	//b comment
+    return ChangeMe()
+}
diff --git a/t/t4018/kotlin-inheritace-class b/t/t4018/kotlin-inheritace-class
new file mode 100644
index 0000000..77376c1
--- /dev/null
+++ b/t/t4018/kotlin-inheritace-class
@@ -0,0 +1,5 @@
+open class RIGHT{
+	// a comment
+	// b comment
+	// ChangeMe
+}
diff --git a/t/t4018/kotlin-inline-class b/t/t4018/kotlin-inline-class
new file mode 100644
index 0000000..7bf46dd
--- /dev/null
+++ b/t/t4018/kotlin-inline-class
@@ -0,0 +1,5 @@
+value class RIGHT(Args){
+	// a comment
+	// b comment
+	ChangeMe
+}
diff --git a/t/t4018/kotlin-interface b/t/t4018/kotlin-interface
new file mode 100644
index 0000000..f686ba7
--- /dev/null
+++ b/t/t4018/kotlin-interface
@@ -0,0 +1,5 @@
+interface RIGHT{
+	//another comment
+	//another comment
+	//ChangeMe
+}
diff --git a/t/t4018/kotlin-nested-fun b/t/t4018/kotlin-nested-fun
new file mode 100644
index 0000000..1218685
--- /dev/null
+++ b/t/t4018/kotlin-nested-fun
@@ -0,0 +1,9 @@
+class LEFT{
+	class CENTER{
+		fun RIGHT(  a:Int){
+			//comment
+			//comment
+			ChangeMe
+		}
+	}
+}
diff --git a/t/t4018/kotlin-public-class b/t/t4018/kotlin-public-class
new file mode 100644
index 0000000..9433fcc
--- /dev/null
+++ b/t/t4018/kotlin-public-class
@@ -0,0 +1,5 @@
+public class RIGHT{
+	//comment1
+	//comment2
+	ChangeMe
+}
diff --git a/t/t4018/kotlin-sealed-class b/t/t4018/kotlin-sealed-class
new file mode 100644
index 0000000..0efa4a4
--- /dev/null
+++ b/t/t4018/kotlin-sealed-class
@@ -0,0 +1,5 @@
+sealed class RIGHT {
+	// a comment
+	// b comment
+	ChangeMe
+}
diff --git a/t/t4018/php-abstract-method b/t/t4018/php-abstract-method
new file mode 100644
index 0000000..ce215df
--- /dev/null
+++ b/t/t4018/php-abstract-method
@@ -0,0 +1,7 @@
+abstract class Klass
+{
+    abstract public function RIGHT(): ?string
+    {
+        return 'ChangeMe';
+    }
+}
diff --git a/t/t4018/php-enum b/t/t4018/php-enum
new file mode 100644
index 0000000..91a69c1
--- /dev/null
+++ b/t/t4018/php-enum
@@ -0,0 +1,4 @@
+enum RIGHT: string
+{
+    case Foo = 'ChangeMe';
+}
diff --git a/t/t4018/php-final-method b/t/t4018/php-final-method
new file mode 100644
index 0000000..537fb8a
--- /dev/null
+++ b/t/t4018/php-final-method
@@ -0,0 +1,7 @@
+class Klass
+{
+    final public function RIGHT(): string
+    {
+        return 'ChangeMe';
+    }
+}
diff --git a/t/t4018/rust-macro-rules b/t/t4018/rust-macro-rules
new file mode 100644
index 0000000..ec610c5
--- /dev/null
+++ b/t/t4018/rust-macro-rules
@@ -0,0 +1,6 @@
+macro_rules! RIGHT {
+    () => {
+        // a comment
+        let x = ChangeMe;
+    };
+}
diff --git a/t/t4018/scheme-class b/t/t4018/scheme-class
new file mode 100644
index 0000000..e5e07b4
--- /dev/null
+++ b/t/t4018/scheme-class
@@ -0,0 +1,7 @@
+(define book-class%
+  (class* () object% RIGHT
+    (field (pages 5))
+    (field (ChangeMe 5))
+    (define/public (letters)
+      (* pages 500))
+    (super-new)))
diff --git a/t/t4018/scheme-def b/t/t4018/scheme-def
new file mode 100644
index 0000000..1e2673d
--- /dev/null
+++ b/t/t4018/scheme-def
@@ -0,0 +1,4 @@
+(def (some-func x y z) RIGHT
+  (let ((a x)
+        (b y))
+        (ChangeMe a b)))
diff --git a/t/t4018/scheme-def-variant b/t/t4018/scheme-def-variant
new file mode 100644
index 0000000..d857a61
--- /dev/null
+++ b/t/t4018/scheme-def-variant
@@ -0,0 +1,4 @@
+(defmethod {print point} RIGHT
+  (lambda (self)
+    (with ((point x y) self)
+      (printf "{ChangeMe x:~a y:~a}~n" x y))))
diff --git a/t/t4018/scheme-define-slash-public b/t/t4018/scheme-define-slash-public
new file mode 100644
index 0000000..39a93a1
--- /dev/null
+++ b/t/t4018/scheme-define-slash-public
@@ -0,0 +1,7 @@
+(define bar-class%
+  (class object%
+    (field (info 5))
+    (define/public (foo) RIGHT
+      (+ info 42)
+      (* info ChangeMe))
+    (super-new)))
diff --git a/t/t4018/scheme-define-syntax b/t/t4018/scheme-define-syntax
new file mode 100644
index 0000000..7d5e99e
--- /dev/null
+++ b/t/t4018/scheme-define-syntax
@@ -0,0 +1,8 @@
+(define-syntax define-test-suite RIGHT
+  (syntax-rules ()
+    ((_ suite-name (name test) ChangeMe ...)
+     (define suite-name
+       (let ((tests
+              `((name . ,test) ...)))
+         (lambda ()
+           (run-suite 'suite-name tests)))))))
diff --git a/t/t4018/scheme-define-variant b/t/t4018/scheme-define-variant
new file mode 100644
index 0000000..9117088
--- /dev/null
+++ b/t/t4018/scheme-define-variant
@@ -0,0 +1,4 @@
+(define* (some-func x y z) RIGHT
+  (let ((a x)
+        (b y))
+        (ChangeMe a b)))
diff --git a/t/t4018/scheme-library b/t/t4018/scheme-library
new file mode 100644
index 0000000..82ea3df
--- /dev/null
+++ b/t/t4018/scheme-library
@@ -0,0 +1,11 @@
+(library (my-helpers id-stuff) RIGHT
+  (export find-dup)
+  (import (ChangeMe))
+  (define (find-dup l)
+    (and (pair? l)
+         (let loop ((rest (cdr l)))
+           (cond
+            [(null? rest) (find-dup (cdr l))]
+            [(bound-identifier=? (car l) (car rest))
+             (car rest)]
+            [else (loop (cdr rest))])))))
diff --git a/t/t4018/scheme-local-define b/t/t4018/scheme-local-define
new file mode 100644
index 0000000..bc6d8ae
--- /dev/null
+++ b/t/t4018/scheme-local-define
@@ -0,0 +1,4 @@
+(define (higher-order)
+  (define local-function RIGHT
+    (lambda (x)
+     (car "this is" "ChangeMe"))))
diff --git a/t/t4018/scheme-module b/t/t4018/scheme-module
new file mode 100644
index 0000000..edfae0e
--- /dev/null
+++ b/t/t4018/scheme-module
@@ -0,0 +1,6 @@
+(module A RIGHT
+  (export with-display-exception)
+  (extern (display-exception display-exception ChangeMe))
+  (def (with-display-exception thunk)
+    (with-catch (lambda (e) (display-exception e (current-error-port)) e)
+      thunk)))
diff --git a/t/t4018/scheme-top-level-define b/t/t4018/scheme-top-level-define
new file mode 100644
index 0000000..624743c
--- /dev/null
+++ b/t/t4018/scheme-top-level-define
@@ -0,0 +1,4 @@
+(define (some-func x y z) RIGHT
+  (let ((a x)
+        (b y))
+        (ChangeMe a b)))
diff --git a/t/t4018/scheme-user-defined-define b/t/t4018/scheme-user-defined-define
new file mode 100644
index 0000000..35fe7cc
--- /dev/null
+++ b/t/t4018/scheme-user-defined-define
@@ -0,0 +1,6 @@
+(define-test-suite record\ case-tests RIGHT
+  (record-case-1 (lambda (fail)
+                   (let ((a (make-foo 1 2)))
+                     (record-case a
+                       ((bar x) (ChangeMe))
+                       ((foo a b) (+ a b)))))))
diff --git a/t/t4019-diff-wserror.sh b/t/t4019-diff-wserror.sh
index c6135c7..d2b3109 100755
--- a/t/t4019-diff-wserror.sh
+++ b/t/t4019-diff-wserror.sh
@@ -2,6 +2,7 @@
 
 test_description='diff whitespace error detection'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -286,9 +287,9 @@ test_expect_success 'do not color trailing cr in context' '
 '
 
 test_expect_success 'color new trailing blank lines' '
-	{ echo a; echo b; echo; echo; } >x &&
+	test_write_lines a b "" "" >x &&
 	git add x &&
-	{ echo a; echo; echo; echo; echo c; echo; echo; echo; echo; } >x &&
+	test_write_lines a "" "" "" c "" "" "" "" >x &&
 	git diff --color x >output &&
 	cnt=$($grep_a "${blue_grep}" output | wc -l) &&
 	test $cnt = 2
diff --git a/t/t4020-diff-external.sh b/t/t4020-diff-external.sh
index e009826..fdd865f 100755
--- a/t/t4020-diff-external.sh
+++ b/t/t4020-diff-external.sh
@@ -2,6 +2,7 @@
 
 test_description='external diff interface test'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -23,45 +24,38 @@ test_expect_success setup '
 '
 
 test_expect_success 'GIT_EXTERNAL_DIFF environment' '
-
-	GIT_EXTERNAL_DIFF=echo git diff | {
-		read path oldfile oldhex oldmode newfile newhex newmode &&
-		test "z$path" = zfile &&
-		test "z$oldmode" = z100644 &&
-		test "z$newhex" = "z$ZERO_OID" &&
-		test "z$newmode" = z100644 &&
-		oh=$(git rev-parse --verify HEAD:file) &&
-		test "z$oh" = "z$oldhex"
-	}
+	cat >expect <<-EOF &&
+	file $(git rev-parse --verify HEAD:file) 100644 file $(test_oid zero) 100644
+	EOF
+	GIT_EXTERNAL_DIFF=echo git diff >out &&
+	cut -d" " -f1,3- <out >actual &&
+	test_cmp expect actual
 
 '
 
 test_expect_success 'GIT_EXTERNAL_DIFF environment should apply only to diff' '
-
-	GIT_EXTERNAL_DIFF=echo git log -p -1 HEAD |
-	grep "^diff --git a/file b/file"
+	GIT_EXTERNAL_DIFF=echo git log -p -1 HEAD >out &&
+	grep "^diff --git a/file b/file" out
 
 '
 
 test_expect_success 'GIT_EXTERNAL_DIFF environment and --no-ext-diff' '
-
-	GIT_EXTERNAL_DIFF=echo git diff --no-ext-diff |
-	grep "^diff --git a/file b/file"
+	GIT_EXTERNAL_DIFF=echo git diff --no-ext-diff >out &&
+	grep "^diff --git a/file b/file" out
 
 '
 
 test_expect_success SYMLINKS 'typechange diff' '
 	rm -f file &&
 	ln -s elif file &&
-	GIT_EXTERNAL_DIFF=echo git diff  | {
-		read path oldfile oldhex oldmode newfile newhex newmode &&
-		test "z$path" = zfile &&
-		test "z$oldmode" = z100644 &&
-		test "z$newhex" = "z$ZERO_OID" &&
-		test "z$newmode" = z120000 &&
-		oh=$(git rev-parse --verify HEAD:file) &&
-		test "z$oh" = "z$oldhex"
-	} &&
+
+	cat >expect <<-EOF &&
+	file $(git rev-parse --verify HEAD:file) 100644 $(test_oid zero) 120000
+	EOF
+	GIT_EXTERNAL_DIFF=echo git diff >out &&
+	cut -d" " -f1,3-4,6- <out >actual &&
+	test_cmp expect actual &&
+
 	GIT_EXTERNAL_DIFF=echo git diff --no-ext-diff >actual &&
 	git diff >expect &&
 	test_cmp expect actual
@@ -71,27 +65,25 @@ test_expect_success 'diff.external' '
 	git reset --hard &&
 	echo third >file &&
 	test_config diff.external echo &&
-	git diff | {
-		read path oldfile oldhex oldmode newfile newhex newmode &&
-		test "z$path" = zfile &&
-		test "z$oldmode" = z100644 &&
-		test "z$newhex" = "z$ZERO_OID" &&
-		test "z$newmode" = z100644 &&
-		oh=$(git rev-parse --verify HEAD:file) &&
-		test "z$oh" = "z$oldhex"
-	}
+
+	cat >expect <<-EOF &&
+	file $(git rev-parse --verify HEAD:file) 100644 $(test_oid zero) 100644
+	EOF
+	git diff >out &&
+	cut -d" " -f1,3-4,6- <out >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success 'diff.external should apply only to diff' '
 	test_config diff.external echo &&
-	git log -p -1 HEAD |
-	grep "^diff --git a/file b/file"
+	git log -p -1 HEAD >out &&
+	grep "^diff --git a/file b/file" out
 '
 
 test_expect_success 'diff.external and --no-ext-diff' '
 	test_config diff.external echo &&
-	git diff --no-ext-diff |
-	grep "^diff --git a/file b/file"
+	git diff --no-ext-diff >out &&
+	grep "^diff --git a/file b/file" out
 '
 
 test_expect_success 'diff attribute' '
@@ -102,29 +94,23 @@ test_expect_success 'diff attribute' '
 
 	echo >.gitattributes "file diff=parrot" &&
 
-	git diff | {
-		read path oldfile oldhex oldmode newfile newhex newmode &&
-		test "z$path" = zfile &&
-		test "z$oldmode" = z100644 &&
-		test "z$newhex" = "z$ZERO_OID" &&
-		test "z$newmode" = z100644 &&
-		oh=$(git rev-parse --verify HEAD:file) &&
-		test "z$oh" = "z$oldhex"
-	}
-
+	cat >expect <<-EOF &&
+	file $(git rev-parse --verify HEAD:file) 100644 $(test_oid zero) 100644
+	EOF
+	git diff >out &&
+	cut -d" " -f1,3-4,6- <out >actual &&
+	test_cmp expect actual
 '
 
-test_expect_success 'diff attribute should apply only to diff' '
-
-	git log -p -1 HEAD |
-	grep "^diff --git a/file b/file"
+test_expect_success !SANITIZE_LEAK 'diff attribute should apply only to diff' '
+	git log -p -1 HEAD >out &&
+	grep "^diff --git a/file b/file" out
 
 '
 
 test_expect_success 'diff attribute and --no-ext-diff' '
-
-	git diff --no-ext-diff |
-	grep "^diff --git a/file b/file"
+	git diff --no-ext-diff >out &&
+	grep "^diff --git a/file b/file" out
 
 '
 
@@ -135,48 +121,55 @@ test_expect_success 'diff attribute' '
 
 	echo >.gitattributes "file diff=color" &&
 
-	git diff | {
-		read path oldfile oldhex oldmode newfile newhex newmode &&
-		test "z$path" = zfile &&
-		test "z$oldmode" = z100644 &&
-		test "z$newhex" = "z$ZERO_OID" &&
-		test "z$newmode" = z100644 &&
-		oh=$(git rev-parse --verify HEAD:file) &&
-		test "z$oh" = "z$oldhex"
-	}
-
+	cat >expect <<-EOF &&
+	file $(git rev-parse --verify HEAD:file) 100644 $(test_oid zero) 100644
+	EOF
+	git diff >out &&
+	cut -d" " -f1,3-4,6- <out >actual &&
+	test_cmp expect actual
 '
 
-test_expect_success 'diff attribute should apply only to diff' '
-
-	git log -p -1 HEAD |
-	grep "^diff --git a/file b/file"
+test_expect_success !SANITIZE_LEAK 'diff attribute should apply only to diff' '
+	git log -p -1 HEAD >out &&
+	grep "^diff --git a/file b/file" out
 
 '
 
 test_expect_success 'diff attribute and --no-ext-diff' '
-
-	git diff --no-ext-diff |
-	grep "^diff --git a/file b/file"
+	git diff --no-ext-diff >out &&
+	grep "^diff --git a/file b/file" out
 
 '
 
 test_expect_success 'GIT_EXTERNAL_DIFF trumps diff.external' '
 	>.gitattributes &&
 	test_config diff.external "echo ext-global" &&
-	GIT_EXTERNAL_DIFF="echo ext-env" git diff | grep ext-env
+
+	cat >expect <<-EOF &&
+	ext-env file $(git rev-parse --verify HEAD:file) 100644 file $(test_oid zero) 100644
+	EOF
+	GIT_EXTERNAL_DIFF="echo ext-env" git diff >out &&
+	cut -d" " -f1-2,4- <out >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success 'attributes trump GIT_EXTERNAL_DIFF and diff.external' '
 	test_config diff.foo.command "echo ext-attribute" &&
 	test_config diff.external "echo ext-global" &&
 	echo "file diff=foo" >.gitattributes &&
-	GIT_EXTERNAL_DIFF="echo ext-env" git diff | grep ext-attribute
+
+	cat >expect <<-EOF &&
+	ext-attribute file $(git rev-parse --verify HEAD:file) 100644 file $(test_oid zero) 100644
+	EOF
+	GIT_EXTERNAL_DIFF="echo ext-env" git diff >out &&
+	cut -d" " -f1-2,4- <out >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success 'no diff with -diff' '
 	echo >.gitattributes "file -diff" &&
-	git diff | grep Binary
+	git diff >out &&
+	grep Binary out
 '
 
 echo NULZbetweenZwords | perl -pe 'y/Z/\000/' > file
@@ -213,12 +206,17 @@ test_expect_success 'GIT_EXTERNAL_DIFF path counter/total' '
 '
 
 test_expect_success 'GIT_EXTERNAL_DIFF generates pretty paths' '
+	test_when_finished "git rm -f file.ext" &&
 	touch file.ext &&
 	git add file.ext &&
 	echo with extension > file.ext &&
-	GIT_EXTERNAL_DIFF=echo git diff file.ext | grep ......_file\.ext &&
-	git update-index --force-remove file.ext &&
-	rm file.ext
+
+	cat >expect <<-EOF &&
+	file.ext
+	EOF
+	GIT_EXTERNAL_DIFF=echo git diff file.ext >out &&
+	basename $(cut -d" " -f2 <out) >actual &&
+	test_cmp expect actual
 '
 
 echo "#!$SHELL_PATH" >fake-diff.sh
@@ -234,7 +232,7 @@ keep_only_cr () {
 test_expect_success 'external diff with autocrlf = true' '
 	test_config core.autocrlf true &&
 	GIT_EXTERNAL_DIFF=./fake-diff.sh git diff &&
-	test $(wc -l < crlfed.txt) = $(cat crlfed.txt | keep_only_cr | wc -c)
+	test $(wc -l <crlfed.txt) = $(keep_only_cr <crlfed.txt | wc -c)
 '
 
 test_expect_success 'diff --cached' '
diff --git a/t/t4021-format-patch-numbered.sh b/t/t4021-format-patch-numbered.sh
index 9be65fd..1219aa2 100755
--- a/t/t4021-format-patch-numbered.sh
+++ b/t/t4021-format-patch-numbered.sh
@@ -5,6 +5,7 @@
 
 test_description='Format-patch numbering options'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
diff --git a/t/t4022-diff-rewrite.sh b/t/t4022-diff-rewrite.sh
index 6d1c3d9..6fed993 100755
--- a/t/t4022-diff-rewrite.sh
+++ b/t/t4022-diff-rewrite.sh
@@ -3,15 +3,17 @@
 test_description='rewrite diff'
 
 . ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-diff-data.sh
 
 test_expect_success setup '
 
-	cat "$TEST_DIRECTORY"/../COPYING >test &&
+	COPYING_test_data >test.data &&
+	cp test.data test &&
 	git add test &&
 	tr \
 	  "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ" \
 	  "nopqrstuvwxyzabcdefghijklmNOPQRSTUVWXYZABCDEFGHIJKLM" \
-	  <"$TEST_DIRECTORY"/../COPYING >test &&
+	  <test.data >test &&
 	echo "to be deleted" >test2 &&
 	blob=$(git hash-object test2) &&
 	blob=$(git rev-parse --short $blob) &&
@@ -22,7 +24,7 @@ test_expect_success setup '
 test_expect_success 'detect rewrite' '
 
 	actual=$(git diff-files -B --summary test) &&
-	verbose expr "$actual" : " rewrite test ([0-9]*%)$"
+	expr "$actual" : " rewrite test ([0-9]*%)$"
 
 '
 
diff --git a/t/t4023-diff-rename-typechange.sh b/t/t4023-diff-rename-typechange.sh
index 8c98237..787605c 100755
--- a/t/t4023-diff-rename-typechange.sh
+++ b/t/t4023-diff-rename-typechange.sh
@@ -3,25 +3,26 @@
 test_description='typechange rename detection'
 
 . ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-diff.sh
 
 test_expect_success setup '
 
 	rm -f foo bar &&
-	cat "$TEST_DIRECTORY"/../COPYING >foo &&
+	COPYING_test_data >foo &&
 	test_ln_s_add linklink bar &&
 	git add foo &&
 	git commit -a -m Initial &&
 	git tag one &&
 
 	git rm -f foo bar &&
-	cat "$TEST_DIRECTORY"/../COPYING >bar &&
+	COPYING_test_data >bar &&
 	test_ln_s_add linklink foo &&
 	git add bar &&
 	git commit -a -m Second &&
 	git tag two &&
 
 	git rm -f foo bar &&
-	cat "$TEST_DIRECTORY"/../COPYING >foo &&
+	COPYING_test_data >foo &&
 	git add foo &&
 	git commit -a -m Third &&
 	git tag three &&
@@ -35,7 +36,7 @@ test_expect_success setup '
 	# This is purely for sanity check
 
 	git rm -f foo bar &&
-	cat "$TEST_DIRECTORY"/../COPYING >foo &&
+	COPYING_test_data >foo &&
 	cat "$TEST_DIRECTORY"/../Makefile >bar &&
 	git add foo bar &&
 	git commit -a -m Fifth &&
@@ -43,7 +44,7 @@ test_expect_success setup '
 
 	git rm -f foo bar &&
 	cat "$TEST_DIRECTORY"/../Makefile >foo &&
-	cat "$TEST_DIRECTORY"/../COPYING >bar &&
+	COPYING_test_data >bar &&
 	git add foo bar &&
 	git commit -a -m Sixth &&
 	git tag six
@@ -51,10 +52,10 @@ test_expect_success setup '
 '
 
 test_expect_success 'cross renames to be detected for regular files' '
-
-	git diff-tree five six -r --name-status -B -M | sort >actual &&
+	git diff-tree five six -r --name-status -B -M >out &&
+	sort out >actual &&
 	{
-		echo "R100	foo	bar"
+		echo "R100	foo	bar" &&
 		echo "R100	bar	foo"
 	} | sort >expect &&
 	test_cmp expect actual
@@ -62,10 +63,10 @@ test_expect_success 'cross renames to be detected for regular files' '
 '
 
 test_expect_success 'cross renames to be detected for typechange' '
-
-	git diff-tree one two -r --name-status -B -M | sort >actual &&
+	git diff-tree one two -r --name-status -B -M >out &&
+	sort out >actual &&
 	{
-		echo "R100	foo	bar"
+		echo "R100	foo	bar" &&
 		echo "R100	bar	foo"
 	} | sort >expect &&
 	test_cmp expect actual
@@ -73,11 +74,11 @@ test_expect_success 'cross renames to be detected for typechange' '
 '
 
 test_expect_success 'moves and renames' '
-
-	git diff-tree three four -r --name-status -B -M | sort >actual &&
+	git diff-tree three four -r --name-status -B -M >out &&
+	sort out >actual &&
 	{
 		# see -B -M (#6) in t4008
-		echo "C100	foo	bar"
+		echo "C100	foo	bar" &&
 		echo "T100	foo"
 	} | sort >expect &&
 	test_cmp expect actual
diff --git a/t/t4024-diff-optimize-common.sh b/t/t4024-diff-optimize-common.sh
index 6b44ce1..e2f0eca 100755
--- a/t/t4024-diff-optimize-common.sh
+++ b/t/t4024-diff-optimize-common.sh
@@ -2,6 +2,7 @@
 
 test_description='common tail optimization'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 z=zzzzzzzz ;# 8
@@ -148,7 +149,7 @@ test_expect_success 'diff -U0' '
 
 	for n in $sample
 	do
-		git diff -U0 file-?$n
+		git diff -U0 file-?$n || return 1
 	done | zc >actual &&
 	test_cmp expect actual
 
diff --git a/t/t4025-hunk-header.sh b/t/t4025-hunk-header.sh
index 35578f2..5397cb7 100755
--- a/t/t4025-hunk-header.sh
+++ b/t/t4025-hunk-header.sh
@@ -2,6 +2,7 @@
 
 test_description='diff hunk header truncation'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 N='日本語'
@@ -13,15 +14,9 @@ test_expect_success setup '
 
 	(
 		echo "A $NS" &&
-		for c in B C D E F G H I J K
-		do
-			echo "  $c"
-		done &&
+		printf "  %s\n" B C D E F G H I J K &&
 		echo "L  $NS" &&
-		for c in M N O P Q R S T U V
-		do
-			echo "  $c"
-		done
+		printf "  %s\n" M N O P Q R S T U V
 	) >file &&
 	git add file &&
 
diff --git a/t/t4026-color.sh b/t/t4026-color.sh
index c0b642c..cc3f60d 100755
--- a/t/t4026-color.sh
+++ b/t/t4026-color.sh
@@ -4,6 +4,8 @@
 #
 
 test_description='Test diff/status color escape codes'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 ESC=$(printf '\033')
@@ -58,6 +60,10 @@ test_expect_success 'fg bg attr...' '
 	color "blue bold dim ul blink reverse" "[1;2;4;5;7;34m"
 '
 
+test_expect_success 'reset fg bg attr...' '
+	color "reset blue bold dim ul blink reverse" "[;1;2;4;5;7;34m"
+'
+
 # note that nobold and nodim are the same code (22)
 test_expect_success 'attr negation' '
 	color "nobold nodim noul noblink noreverse" "[22;24;25;27m"
@@ -94,6 +100,18 @@ test_expect_success '24-bit colors' '
 	color "#ff00ff black" "[38;2;255;0;255;40m"
 '
 
+test_expect_success '"default" foreground' '
+	color "default" "[39m"
+'
+
+test_expect_success '"normal default" to clear background' '
+	color "normal default" "[49m"
+'
+
+test_expect_success '"default" can be combined with attributes' '
+	color "default default no-reverse bold" "[1;27;39;49m"
+'
+
 test_expect_success '"normal" yields no color at all"' '
 	color "normal black" "[40m"
 '
diff --git a/t/t4027-diff-submodule.sh b/t/t4027-diff-submodule.sh
index d7145cc..40164ae 100755
--- a/t/t4027-diff-submodule.sh
+++ b/t/t4027-diff-submodule.sh
@@ -2,8 +2,9 @@
 
 test_description='difference in submodules'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
-. "$TEST_DIRECTORY"/diff-lib.sh
+. "$TEST_DIRECTORY"/lib-diff.sh
 
 test_expect_success setup '
 	test_tick &&
@@ -27,10 +28,8 @@ test_expect_success setup '
 		git commit -m "submodule #2"
 	) &&
 
-	set x $(
-		cd sub &&
-		git rev-list HEAD
-	) &&
+	git -C sub rev-list HEAD >revs &&
+	set x $(cat revs) &&
 	echo ":160000 160000 $3 $ZERO_OID M	sub" >expect &&
 	subtip=$3 subprev=$2
 '
@@ -93,6 +92,14 @@ test_expect_success 'git diff HEAD with dirty submodule (untracked)' '
 	) &&
 	git diff HEAD >actual &&
 	sed -e "1,/^@@/d" actual >actual.body &&
+	expect_from_to >expect.body $subtip $subprev &&
+	test_cmp expect.body actual.body
+'
+
+test_expect_success 'git diff HEAD with dirty submodule (untracked) (none ignored)' '
+	test_config diff.ignoreSubmodules none &&
+	git diff HEAD >actual &&
+	sed -e "1,/^@@/d" actual >actual.body &&
 	expect_from_to >expect.body $subtip $subprev-dirty &&
 	test_cmp expect.body actual.body
 '
@@ -168,13 +175,13 @@ test_expect_success 'git diff HEAD with dirty submodule (untracked, refs match)'
 		git clean -qfdx &&
 		>cruft
 	) &&
-	git diff HEAD >actual &&
+	git diff --ignore-submodules=none HEAD >actual &&
 	sed -e "1,/^@@/d" actual >actual.body &&
 	expect_from_to >expect.body $subprev $subprev-dirty &&
 	test_cmp expect.body actual.body &&
 	git diff --ignore-submodules=all HEAD >actual2 &&
 	test_must_be_empty actual2 &&
-	git diff --ignore-submodules=untracked HEAD >actual3 &&
+	git diff HEAD >actual3 &&
 	test_must_be_empty actual3 &&
 	git diff --ignore-submodules=dirty HEAD >actual4 &&
 	test_must_be_empty actual4
diff --git a/t/t4028-format-patch-mime-headers.sh b/t/t4028-format-patch-mime-headers.sh
index 204ba67..60cb819 100755
--- a/t/t4028-format-patch-mime-headers.sh
+++ b/t/t4028-format-patch-mime-headers.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='format-patch mime headers and extra headers do not conflict'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'create commit with utf-8 body' '
diff --git a/t/t4029-diff-trailing-space.sh b/t/t4029-diff-trailing-space.sh
index 32b6e9a..5f8ffef 100755
--- a/t/t4029-diff-trailing-space.sh
+++ b/t/t4029-diff-trailing-space.sh
@@ -4,6 +4,7 @@
 #
 test_description='diff honors config option, diff.suppressBlankEmpty'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 cat <<\EOF >expected ||
diff --git a/t/t4030-diff-textconv.sh b/t/t4030-diff-textconv.sh
index 4cb9f0e..a39a626 100755
--- a/t/t4030-diff-textconv.sh
+++ b/t/t4030-diff-textconv.sh
@@ -26,12 +26,8 @@ EOF
 chmod +x hexdump
 
 test_expect_success 'setup binary file with history' '
-	printf "\\0\\n" >file &&
-	git add file &&
-	git commit -m one &&
-	printf "\\01\\n" >>file &&
-	git add file &&
-	git commit -m two
+	test_commit --printf one file "\\0\\n" &&
+	test_commit --printf --append two file "\\01\\n"
 '
 
 test_expect_success 'file is considered binary by porcelain' '
@@ -139,7 +135,7 @@ EOF
 test_expect_success 'diffstat does not run textconv' '
 	echo file diff=fail >.gitattributes &&
 	git diff --stat HEAD^ HEAD >actual &&
-	test_i18ncmp expect.stat actual &&
+	test_cmp expect.stat actual &&
 
 	head -n1 <expect.stat >expect.line1 &&
 	head -n1 <actual >actual.line1 &&
diff --git a/t/t4031-diff-rewrite-binary.sh b/t/t4031-diff-rewrite-binary.sh
index eacc669..c4394a2 100755
--- a/t/t4031-diff-rewrite-binary.sh
+++ b/t/t4031-diff-rewrite-binary.sh
@@ -53,7 +53,7 @@ test_expect_success 'rewrite diff --numstat shows binary changes' '
 test_expect_success 'diff --stat counts binary rewrite as 0 lines' '
 	git diff -B --stat --summary >diff &&
 	grep "Bin" diff &&
-	test_i18ngrep "0 insertions.*0 deletions" diff &&
+	test_grep "0 insertions.*0 deletions" diff &&
 	grep " rewrite file" diff
 '
 
diff --git a/t/t4032-diff-inter-hunk-context.sh b/t/t4032-diff-inter-hunk-context.sh
index bada0cb..7db92d0 100755
--- a/t/t4032-diff-inter-hunk-context.sh
+++ b/t/t4032-diff-inter-hunk-context.sh
@@ -2,6 +2,7 @@
 
 test_description='diff hunk fusing'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 f() {
diff --git a/t/t4033-diff-patience.sh b/t/t4033-diff-patience.sh
index 113304d..f7be7f5 100755
--- a/t/t4033-diff-patience.sh
+++ b/t/t4033-diff-patience.sh
@@ -2,6 +2,7 @@
 
 test_description='patience diff algorithm'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-diff-alternative.sh
 
diff --git a/t/t4034-diff-words.sh b/t/t4034-diff-words.sh
index 0c8fb39..74586f3 100755
--- a/t/t4034-diff-words.sh
+++ b/t/t4034-diff-words.sh
@@ -2,8 +2,9 @@
 
 test_description='word diff colors'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
-. "$TEST_DIRECTORY"/diff-lib.sh
+. "$TEST_DIRECTORY"/lib-diff.sh
 
 cat >pre.simple <<-\EOF
 	h(4)
@@ -68,6 +69,10 @@ test_language_driver () {
 		echo "* diff='"$lang"'" >.gitattributes &&
 		word_diff --color-words
 	'
+	test_expect_success "diff driver '$lang' in Islandic" '
+		LANG=is_IS.UTF-8 LANGUAGE=is LC_ALL="$is_IS_locale" \
+		word_diff --color-words
+	'
 }
 
 test_expect_success setup '
@@ -184,6 +189,11 @@ test_expect_success 'word diff with a regular expression' '
 	word_diff --color-words="[a-z]+"
 '
 
+test_expect_success 'word diff with zero length matches' '
+	cp expect.letter-runs-are-words expect &&
+	word_diff --color-words="[a-z${LF}]*"
+'
+
 test_expect_success 'set up a diff driver' '
 	git config diff.testdriver.wordRegex "[^[:space:]]" &&
 	cat <<-\EOF >.gitattributes
@@ -318,6 +328,7 @@ test_language_driver dts
 test_language_driver fortran
 test_language_driver html
 test_language_driver java
+test_language_driver kotlin
 test_language_driver matlab
 test_language_driver objc
 test_language_driver pascal
@@ -325,6 +336,7 @@ test_language_driver perl
 test_language_driver php
 test_language_driver python
 test_language_driver ruby
+test_language_driver scheme
 test_language_driver tex
 
 test_expect_success 'word-diff with diff.sbe' '
diff --git a/t/t4034/cpp/expect b/t/t4034/cpp/expect
index 37d1ea2..dc500ae 100644
--- a/t/t4034/cpp/expect
+++ b/t/t4034/cpp/expect
@@ -1,36 +1,35 @@
 <BOLD>diff --git a/pre b/post<RESET>
-<BOLD>index 23d5c8a..7e8c026 100644<RESET>
+<BOLD>index a1a09b7..f1b6f3c 100644<RESET>
 <BOLD>--- a/pre<RESET>
 <BOLD>+++ b/post<RESET>
-<CYAN>@@ -1,19 +1,19 @@<RESET>
-Foo() : x(0<RED>&&1<RESET><GREEN>&42<RESET>) { <GREEN>bar(x);<RESET> }
+<CYAN>@@ -1,30 +1,30 @@<RESET>
+Foo() : x(0<RED>&&1<RESET><GREEN>&42<RESET>) { <RED>foo0<RESET><GREEN>bar<RESET>(x.<RED>find<RESET><GREEN>Find<RESET>); }
 cout<<"Hello World<RED>!<RESET><GREEN>?<RESET>\n"<<endl;
-<GREEN>(<RESET>1<GREEN>) (<RESET>-1e10<GREEN>) (<RESET>0xabcdef<GREEN>)<RESET> '<RED>x<RESET><GREEN>y<RESET>'
-[<RED>a<RESET><GREEN>x<RESET>] <RED>a<RESET><GREEN>x<RESET>-><RED>b a<RESET><GREEN>y x<RESET>.<RED>b<RESET><GREEN>y<RESET>
-!<RED>a<RESET><GREEN>x<RESET> ~<RED>a a<RESET><GREEN>x x<RESET>++ <RED>a<RESET><GREEN>x<RESET>-- <RED>a<RESET><GREEN>x<RESET>*<RED>b a<RESET><GREEN>y x<RESET>&<RED>b<RESET>
-<RED>a<RESET><GREEN>y<RESET>
-<GREEN>x<RESET>*<RED>b a<RESET><GREEN>y x<RESET>/<RED>b a<RESET><GREEN>y x<RESET>%<RED>b<RESET>
-<RED>a<RESET><GREEN>y<RESET>
-<GREEN>x<RESET>+<RED>b a<RESET><GREEN>y x<RESET>-<RED>b<RESET>
-<RED>a<RESET><GREEN>y<RESET>
-<GREEN>x<RESET><<<RED>b a<RESET><GREEN>y x<RESET>>><RED>b<RESET>
-<RED>a<RESET><GREEN>y<RESET>
-<GREEN>x<RESET><<RED>b a<RESET><GREEN>y x<RESET><=<RED>b a<RESET><GREEN>y x<RESET>><RED>b a<RESET><GREEN>y x<RESET>>=<RED>b<RESET>
-<RED>a<RESET><GREEN>y<RESET>
-<GREEN>x<RESET>==<RED>b a<RESET><GREEN>y x<RESET>!=<RED>b<RESET>
-<RED>a<RESET><GREEN>y<RESET>
-<GREEN>x<RESET>&<RED>b<RESET>
-<RED>a<RESET><GREEN>y<RESET>
-<GREEN>x<RESET>^<RED>b<RESET>
-<RED>a<RESET><GREEN>y<RESET>
-<GREEN>x<RESET>|<RED>b<RESET>
-<RED>a<RESET><GREEN>y<RESET>
-<GREEN>x<RESET>&&<RED>b<RESET>
-<RED>a<RESET><GREEN>y<RESET>
-<GREEN>x<RESET>||<RED>b<RESET>
-<RED>a<RESET><GREEN>y<RESET>
-<GREEN>x<RESET>?<RED>b<RESET><GREEN>y<RESET>:z
-<RED>a<RESET><GREEN>x<RESET>=<RED>b a<RESET><GREEN>y x<RESET>+=<RED>b a<RESET><GREEN>y x<RESET>-=<RED>b a<RESET><GREEN>y x<RESET>*=<RED>b a<RESET><GREEN>y x<RESET>/=<RED>b a<RESET><GREEN>y x<RESET>%=<RED>b a<RESET><GREEN>y x<RESET><<=<RED>b a<RESET><GREEN>y x<RESET>>>=<RED>b a<RESET><GREEN>y x<RESET>&=<RED>b a<RESET><GREEN>y x<RESET>^=<RED>b a<RESET><GREEN>y x<RESET>|=<RED>b<RESET>
-<RED>a<RESET><GREEN>y<RESET>
-<GREEN>x<RESET>,y
-<RED>a<RESET><GREEN>x<RESET>::<RED>b<RESET><GREEN>y<RESET>
+<GREEN>(<RESET>1 <RED>-<RESET><GREEN>+<RESET>1e10 0xabcdef<GREEN>)<RESET> '<RED>x<RESET><GREEN>2<RESET>'
+// long double<RESET>
+<RED>3.141592653e-10l<RESET><GREEN>3.141592654e+10l<RESET>
+// float<RESET>
+<RED>120E5f<RESET><GREEN>120E6f<RESET>
+// hex<RESET>
+<RED>0xdead<RESET><GREEN>0xdeaf<RESET>'1<RED>eaF<RESET><GREEN>eaf<RESET>+<RED>8ULL<RESET><GREEN>7ULL<RESET>
+// octal<RESET>
+<RED>01234567<RESET><GREEN>01234560<RESET>
+// binary<RESET>
+<RED>0b1000<RESET><GREEN>0b1100<RESET>+e1
+// expression<RESET>
+1.5-e+<RED>2<RESET><GREEN>3<RESET>+f
+// another one<RESET>
+str.e+<RED>65<RESET><GREEN>75<RESET>
+[a] b<RED>-><RESET><GREEN>->*<RESET>v d<RED>.<RESET><GREEN>.*<RESET>e
+<GREEN>~<RESET>!a <GREEN>!<RESET>~b c<RED>++<RESET><GREEN>+<RESET> d<RED>--<RESET><GREEN>-<RESET> e*<GREEN>*<RESET>f g<RED>&<RESET><GREEN>&&<RESET>h
+a<RED>*<RESET><GREEN>*=<RESET>b c<RED>/<RESET><GREEN>/=<RESET>d e<RED>%<RESET><GREEN>%=<RESET>f
+a<RED>+<RESET><GREEN>++<RESET>b c<RED>-<RESET><GREEN>--<RESET>d
+a<RED><<<RESET><GREEN><<=<RESET>b c<RED>>><RESET><GREEN>>>=<RESET>d
+a<RED><<RESET><GREEN><=<RESET>b c<RED><=<RESET><GREEN><<RESET>d e<RED>><RESET><GREEN>>=<RESET>f g<RED>>=<RESET><GREEN>><RESET>h i<RED><=<RESET><GREEN><=><RESET>j
+a<RED>==<RESET><GREEN>!=<RESET>b c<RED>!=<RESET><GREEN>=<RESET>d
+a<RED>^<RESET><GREEN>^=<RESET>b c<RED>|<RESET><GREEN>|=<RESET>d e<RED>&&<RESET><GREEN>&=<RESET>f
+a<RED>||<RESET><GREEN>|<RESET>b
+a?<GREEN>:<RESET>b
+a<RED>=<RESET><GREEN>==<RESET>b c<RED>+=<RESET><GREEN>+<RESET>d e<RED>-=<RESET><GREEN>-<RESET>f g<RED>*=<RESET><GREEN>*<RESET>h i<RED>/=<RESET><GREEN>/<RESET>j k<RED>%=<RESET><GREEN>%<RESET>l m<RED><<=<RESET><GREEN><<<RESET>n o<RED>>>=<RESET><GREEN>>><RESET>p q<RED>&=<RESET><GREEN>&<RESET>r s<RED>^=<RESET><GREEN>^<RESET>t u<RED>|=<RESET><GREEN>|<RESET>v
+a,b<RESET>
+a<RED>::<RESET><GREEN>:<RESET>b
diff --git a/t/t4034/cpp/post b/t/t4034/cpp/post
index 7e8c026..f1b6f3c 100644
--- a/t/t4034/cpp/post
+++ b/t/t4034/cpp/post
@@ -1,19 +1,30 @@
-Foo() : x(0&42) { bar(x); }
+Foo() : x(0&42) { bar(x.Find); }
 cout<<"Hello World?\n"<<endl;
-(1) (-1e10) (0xabcdef) 'y'
-[x] x->y x.y
-!x ~x x++ x-- x*y x&y
-x*y x/y x%y
-x+y x-y
-x<<y x>>y
-x<y x<=y x>y x>=y
-x==y x!=y
-x&y
-x^y
-x|y
-x&&y
-x||y
-x?y:z
-x=y x+=y x-=y x*=y x/=y x%=y x<<=y x>>=y x&=y x^=y x|=y
-x,y
-x::y
+(1 +1e10 0xabcdef) '2'
+// long double
+3.141592654e+10l
+// float
+120E6f
+// hex
+0xdeaf'1eaf+7ULL
+// octal
+01234560
+// binary
+0b1100+e1
+// expression
+1.5-e+3+f
+// another one
+str.e+75
+[a] b->*v d.*e
+~!a !~b c+ d- e**f g&&h
+a*=b c/=d e%=f
+a++b c--d
+a<<=b c>>=d
+a<=b c<d e>=f g>h i<=>j
+a!=b c=d
+a^=b c|=d e&=f
+a|b
+a?:b
+a==b c+d e-f g*h i/j k%l m<<n o>>p q&r s^t u|v
+a,b
+a:b
diff --git a/t/t4034/cpp/pre b/t/t4034/cpp/pre
index 23d5c8a..a1a09b7 100644
--- a/t/t4034/cpp/pre
+++ b/t/t4034/cpp/pre
@@ -1,19 +1,30 @@
-Foo():x(0&&1){}
+Foo():x(0&&1){ foo0( x.find); }
 cout<<"Hello World!\n"<<endl;
 1 -1e10 0xabcdef 'x'
-[a] a->b a.b
-!a ~a a++ a-- a*b a&b
-a*b a/b a%b
-a+b a-b
-a<<b a>>b
-a<b a<=b a>b a>=b
-a==b a!=b
-a&b
-a^b
-a|b
-a&&b
+// long double
+3.141592653e-10l
+// float
+120E5f
+// hex
+0xdead'1eaF+8ULL
+// octal
+01234567
+// binary
+0b1000+e1
+// expression
+1.5-e+2+f
+// another one
+str.e+65
+[a] b->v d.e
+!a ~b c++ d-- e*f g&h
+a*b c/d e%f
+a+b c-d
+a<<b c>>d
+a<b c<=d e>f g>=h i<=j
+a==b c!=d
+a^b c|d e&&f
 a||b
-a?b:z
-a=b a+=b a-=b a*=b a/=b a%=b a<<=b a>>=b a&=b a^=b a|=b
-a,y
+a?b
+a=b c+=d e-=f g*=h i/=j k%=l m<<=n o>>=p q&=r s^=t u|=v
+a,b
 a::b
diff --git a/t/t4034/kotlin/expect b/t/t4034/kotlin/expect
new file mode 100644
index 0000000..7f76f75
--- /dev/null
+++ b/t/t4034/kotlin/expect
@@ -0,0 +1,43 @@
+<BOLD>diff --git a/pre b/post<RESET>
+<BOLD>index 11ea3de..2e1df4c 100644<RESET>
+<BOLD>--- a/pre<RESET>
+<BOLD>+++ b/post<RESET>
+<CYAN>@@ -1,30 +1,30 @@<RESET>
+println("Hello World<RED>!\n<RESET><GREEN>?<RESET>")
+<GREEN>(<RESET>1<GREEN>) (<RESET>-1e10<GREEN>) (<RESET>0xabcdef<GREEN>)<RESET> '<RED>x<RESET><GREEN>y<RESET>'
+[<RED>a<RESET><GREEN>x<RESET>] <RED>a<RESET><GREEN>x<RESET>-><RED>b a<RESET><GREEN>y x<RESET>.<RED>b<RESET><GREEN>y<RESET>
+!<RED>a a<RESET><GREEN>x x<RESET>.inv() <RED>a<RESET><GREEN>x<RESET>*<RED>b a<RESET><GREEN>y x<RESET>&<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>*<RED>b a<RESET><GREEN>y x<RESET>/<RED>b a<RESET><GREEN>y x<RESET>%<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>+<RED>b a<RESET><GREEN>y x<RESET>-<RED>b<RESET><GREEN>y<RESET>
+a <RED>shr<RESET><GREEN>shl<RESET> b
+<RED>a<RESET><GREEN>x<RESET><<RED>b a<RESET><GREEN>y x<RESET><=<RED>b a<RESET><GREEN>y x<RESET>><RED>b a<RESET><GREEN>y x<RESET>>=<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>==<RED>b a<RESET><GREEN>y x<RESET>!=<RED>b a<RESET><GREEN>y x<RESET>===<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET> and <RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>^<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET> or <RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>&&<RED>b a<RESET><GREEN>y x<RESET>||<RED>b<RESET>
+<RED>a<RESET><GREEN>y<RESET>
+<GREEN>x<RESET>=<RED>b a<RESET><GREEN>y x<RESET>+=<RED>b a<RESET><GREEN>y x<RESET>-=<RED>b a<RESET><GREEN>y x<RESET>*=<RED>b a<RESET><GREEN>y x<RESET>/=<RED>b a<RESET><GREEN>y x<RESET>%=<RED>b a<RESET><GREEN>y x<RESET><<=<RED>b a<RESET><GREEN>y x<RESET>>>=<RED>b a<RESET><GREEN>y x<RESET>&=<RED>b a<RESET><GREEN>y x<RESET>^=<RED>b a<RESET><GREEN>y x<RESET>|=<RED>b<RESET><GREEN>y<RESET>
+a<RED>=<RESET><GREEN>+=<RESET>b c<RED>+=<RESET><GREEN>=<RESET>d e<RED>-=<RESET><GREEN><=<RESET>f g<RED>*=<RESET><GREEN>>=<RESET>h i<RED>/=<RESET><GREEN>/<RESET>j k<RED>%=<RESET><GREEN>%<RESET>l m<RED><<=<RESET><GREEN><<<RESET>n o<RED>>>=<RESET><GREEN>>><RESET>p q<RED>&=<RESET><GREEN>&<RESET>r s<RED>^=<RESET><GREEN>^<RESET>t u<RED>|=<RESET><GREEN>|<RESET>v
+a<RED><<=<RESET><GREEN><=<RESET>b
+a<RED>||<RESET><GREEN>|<RESET>b a<RED>&&<RESET><GREEN>&<RESET>b
+<RED>a<RESET><GREEN>x<RESET>,y
+--a<RED>==<RESET><GREEN>!=<RESET>--b
+a++<RED>==<RESET><GREEN>!=<RESET>++b
+<RED>0xFF_EC_DE_5E 0b100_000 100_000<RESET><GREEN>0xFF_E1_DE_5E 0b100_100 200_000<RESET>
+a<RED>==<RESET><GREEN>===<RESET>b
+a<RED>!!<RESET><GREEN>!=<RESET>b
+<RED>_32<RESET><GREEN>_33<RESET>.find(arr)
+X.<RED>fill<RESET><GREEN>find<RESET>()
+X.<RED>u<RESET><GREEN>f<RESET>+1
+X.u<RED>-<RESET><GREEN>+<RESET>2
+a<RED>.<RESET><GREEN>..<RESET>b
+a<RED>?.<RESET><GREEN>?:<RESET>b
+<RED>.32_00_456<RESET><GREEN>.32_00_446<RESET>
diff --git a/t/t4034/kotlin/post b/t/t4034/kotlin/post
new file mode 100644
index 0000000..2e1df4c
--- /dev/null
+++ b/t/t4034/kotlin/post
@@ -0,0 +1,30 @@
+println("Hello World?")
+(1) (-1e10) (0xabcdef) 'y'
+[x] x->y x.y
+!x x.inv() x*y x&y
+x*y x/y x%y
+x+y x-y
+a shl b
+x<y x<=y x>y x>=y
+x==y x!=y x===y
+x and y
+x^y
+x or y
+x&&y x||y
+x=y x+=y x-=y x*=y x/=y x%=y x<<=y x>>=y x&=y x^=y x|=y
+a+=b c=d e<=f g>=h i/j k%l m<<n o>>p q&r s^t u|v
+a<=b
+a|b a&b
+x,y
+--a!=--b
+a++!=++b
+0xFF_E1_DE_5E 0b100_100 200_000
+a===b
+a!=b
+_33.find(arr)
+X.find()
+X.f+1
+X.u+2
+a..b
+a?:b
+.32_00_446
diff --git a/t/t4034/kotlin/pre b/t/t4034/kotlin/pre
new file mode 100644
index 0000000..11ea3de
--- /dev/null
+++ b/t/t4034/kotlin/pre
@@ -0,0 +1,30 @@
+println("Hello World!\n")
+1 -1e10 0xabcdef 'x'
+[a] a->b a.b
+!a a.inv() a*b a&b
+a*b a/b a%b
+a+b a-b
+a shr b
+a<b a<=b a>b a>=b
+a==b a!=b a===b
+a and b
+a^b
+a or b
+a&&b a||b
+a=b a+=b a-=b a*=b a/=b a%=b a<<=b a>>=b a&=b a^=b a|=b
+a=b c+=d e-=f g*=h i/=j k%=l m<<=n o>>=p q&=r s^=t u|=v
+a<<=b
+a||b a&&b
+a,y
+--a==--b
+a++==++b
+0xFF_EC_DE_5E 0b100_000 100_000
+a==b
+a!!b
+_32.find(arr)
+X.fill()
+X.u+1
+X.u-2
+a.b
+a?.b
+.32_00_456
diff --git a/t/t4034/scheme/expect b/t/t4034/scheme/expect
new file mode 100644
index 0000000..496cd5d
--- /dev/null
+++ b/t/t4034/scheme/expect
@@ -0,0 +1,11 @@
+<BOLD>diff --git a/pre b/post<RESET>
+<BOLD>index 74b6605..63b6ac4 100644<RESET>
+<BOLD>--- a/pre<RESET>
+<BOLD>+++ b/post<RESET>
+<CYAN>@@ -1,6 +1,6 @@<RESET>
+(define (<RED>myfunc a b<RESET><GREEN>my-func first second<RESET>)
+  ; This is a <RED>really<RESET><GREEN>(moderately)<RESET> cool function.
+  (<RED>this\place<RESET><GREEN>that\place<RESET> (+ 3 4))
+  (define <RED>some-text<RESET><GREEN>|a greeting|<RESET> "hello")
+  (let ((c (<RED>+ a b<RESET><GREEN>add1 first<RESET>)))
+    (format "one more than the total is %d" (<RED>add1<RESET><GREEN>+<RESET> c <GREEN>second<RESET>))))
diff --git a/t/t4034/scheme/post b/t/t4034/scheme/post
new file mode 100644
index 0000000..63b6ac4
--- /dev/null
+++ b/t/t4034/scheme/post
@@ -0,0 +1,6 @@
+(define (my-func first second)
+  ; This is a (moderately) cool function.
+  (that\place (+ 3 4))
+  (define |a greeting| "hello")
+  (let ((c (add1 first)))
+    (format "one more than the total is %d" (+ c second))))
diff --git a/t/t4034/scheme/pre b/t/t4034/scheme/pre
new file mode 100644
index 0000000..74b6605
--- /dev/null
+++ b/t/t4034/scheme/pre
@@ -0,0 +1,6 @@
+(define (myfunc a b)
+  ; This is a really cool function.
+  (this\place (+ 3 4))
+  (define some-text "hello")
+  (let ((c (+ a b)))
+    (format "one more than the total is %d" (add1 c))))
diff --git a/t/t4035-diff-quiet.sh b/t/t4035-diff-quiet.sh
index 0352bf8..76f8034 100755
--- a/t/t4035-diff-quiet.sh
+++ b/t/t4035-diff-quiet.sh
@@ -2,6 +2,7 @@
 
 test_description='Return value of diffs'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
diff --git a/t/t4036-format-patch-signer-mime.sh b/t/t4036-format-patch-signer-mime.sh
index 98d9713..48655bc 100755
--- a/t/t4036-format-patch-signer-mime.sh
+++ b/t/t4036-format-patch-signer-mime.sh
@@ -2,6 +2,7 @@
 
 test_description='format-patch -s should force MIME encoding as needed'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
diff --git a/t/t4037-diff-r-t-dirs.sh b/t/t4037-diff-r-t-dirs.sh
index f5ce3b2..b5f96fe 100755
--- a/t/t4037-diff-r-t-dirs.sh
+++ b/t/t4037-diff-r-t-dirs.sh
@@ -2,6 +2,7 @@
 
 test_description='diff -r -t shows directory additions and deletions'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
diff --git a/t/t4038-diff-combined.sh b/t/t4038-diff-combined.sh
index 9468083..2ce26e5 100755
--- a/t/t4038-diff-combined.sh
+++ b/t/t4038-diff-combined.sh
@@ -2,8 +2,11 @@
 
 test_description='combined diff'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
-. "$TEST_DIRECTORY"/diff-lib.sh
+. "$TEST_DIRECTORY"/lib-diff.sh
 
 setup_helper () {
 	one=$1 branch=$2 side=$3 &&
@@ -77,11 +80,21 @@ test_expect_success 'check combined output (1)' '
 	verify_helper sidewithone
 '
 
+test_expect_success 'check combined output (1) with git diff <rev>^!' '
+	git diff sidewithone^! -- >sidewithone &&
+	verify_helper sidewithone
+'
+
 test_expect_success 'check combined output (2)' '
 	git show sidesansone -- >sidesansone &&
 	verify_helper sidesansone
 '
 
+test_expect_success 'check combined output (2) with git diff <rev>^!' '
+	git diff sidesansone^! -- >sidesansone &&
+	verify_helper sidesansone
+'
+
 test_expect_success 'diagnose truncated file' '
 	>file &&
 	git add file &&
@@ -97,7 +110,7 @@ test_expect_success 'setup for --cc --raw' '
 	for i in $(test_seq 1 40)
 	do
 		blob=$(echo file$i | git hash-object --stdin -w) &&
-		trees="$trees$(echo "100644 blob $blob	file" | git mktree)$LF"
+		trees="$trees$(echo "100644 blob $blob	file" | git mktree)$LF" || return 1
 	done
 '
 
@@ -115,7 +128,7 @@ test_expect_success 'check --cc --raw with forty trees' '
 '
 
 test_expect_success 'setup combined ignore spaces' '
-	git checkout master &&
+	git checkout main &&
 	>test &&
 	git add test &&
 	git commit -m initial &&
@@ -143,7 +156,7 @@ test_expect_success 'setup combined ignore spaces' '
 	EOF
 	git commit -m "test other space changes" -a &&
 
-	test_must_fail git merge master &&
+	test_must_fail git merge main &&
 	tr -d Q <<-\EOF >test &&
 	eol spaces Q
 	space  change
@@ -404,7 +417,7 @@ test_expect_success 'combine diff missing delete bug' '
 test_expect_success 'combine diff gets tree sorting right' '
 	# create a directory and a file that sort differently in trees
 	# versus byte-wise (implied "/" sorts after ".")
-	git checkout -f master &&
+	git checkout -f main &&
 	mkdir foo &&
 	echo base >foo/one &&
 	echo base >foo/two &&
@@ -414,9 +427,9 @@ test_expect_success 'combine diff gets tree sorting right' '
 
 	# one side modifies a file in the directory, along with the root
 	# file...
-	echo master >foo/one &&
-	echo master >foo.ext &&
-	git commit -a -m master &&
+	echo main >foo/one &&
+	echo main >foo.ext &&
+	git commit -a -m main &&
 
 	# the other side modifies the other file in the directory
 	git checkout -b other HEAD^ &&
@@ -426,7 +439,7 @@ test_expect_success 'combine diff gets tree sorting right' '
 	# And now we merge. The files in the subdirectory will resolve cleanly,
 	# meaning that a combined diff will not find them interesting. But it
 	# will find the tree itself interesting, because it had to be merged.
-	git checkout master &&
+	git checkout main &&
 	git merge other &&
 
 	printf "MM\tfoo\n" >expect &&
diff --git a/t/t4039-diff-assume-unchanged.sh b/t/t4039-diff-assume-unchanged.sh
index 0eb0314..78090e6 100755
--- a/t/t4039-diff-assume-unchanged.sh
+++ b/t/t4039-diff-assume-unchanged.sh
@@ -2,6 +2,7 @@
 
 test_description='diff with assume-unchanged entries'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # external diff has been tested in t4020-diff-external.sh
diff --git a/t/t4040-whitespace-status.sh b/t/t4040-whitespace-status.sh
index 3c728a3..eec3d73 100755
--- a/t/t4040-whitespace-status.sh
+++ b/t/t4040-whitespace-status.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='diff --exit-code with whitespace'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -26,8 +28,7 @@ test_expect_success 'diff-tree --exit-code' '
 
 test_expect_success 'diff-tree -b --exit-code' '
 	git diff -b --exit-code HEAD^ HEAD &&
-	git diff-tree -b -p --exit-code HEAD^ HEAD &&
-	git diff-tree -b --exit-code HEAD^ HEAD
+	git diff-tree -b -p --exit-code HEAD^ HEAD
 '
 
 test_expect_success 'diff-index --cached --exit-code' '
diff --git a/t/t4041-diff-submodule-option.sh b/t/t4041-diff-submodule-option.sh
index f852136..0c1502d 100755
--- a/t/t4041-diff-submodule-option.sh
+++ b/t/t4041-diff-submodule-option.sh
@@ -9,6 +9,9 @@ test_description='Support for verbose submodule differences in git diff
 This test tries to verify the sanity of the --submodule option of git diff.
 '
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 # Tested non-UTF-8 encoding
@@ -262,7 +265,7 @@ test_expect_success 'submodule is up to date' '
 
 test_expect_success 'submodule contains untracked content' '
 	echo new > sm1/new-file &&
-	git diff-index -p --submodule=log HEAD >actual &&
+	git diff-index -p --ignore-submodules=none --submodule=log HEAD >actual &&
 	cat >expected <<-EOF &&
 	Submodule sm1 contains untracked content
 	EOF
@@ -270,7 +273,7 @@ test_expect_success 'submodule contains untracked content' '
 '
 
 test_expect_success 'submodule contains untracked content (untracked ignored)' '
-	git diff-index -p --ignore-submodules=untracked --submodule=log HEAD >actual &&
+	git diff-index -p --submodule=log HEAD >actual &&
 	test_must_be_empty actual
 '
 
@@ -286,7 +289,7 @@ test_expect_success 'submodule contains untracked content (all ignored)' '
 
 test_expect_success 'submodule contains untracked and modified content' '
 	echo new > sm1/foo6 &&
-	git diff-index -p --submodule=log HEAD >actual &&
+	git diff-index -p --ignore-submodules=none --submodule=log HEAD >actual &&
 	cat >expected <<-EOF &&
 	Submodule sm1 contains untracked content
 	Submodule sm1 contains modified content
@@ -296,7 +299,7 @@ test_expect_success 'submodule contains untracked and modified content' '
 
 test_expect_success 'submodule contains untracked and modified content (untracked ignored)' '
 	echo new > sm1/foo6 &&
-	git diff-index -p --ignore-submodules=untracked --submodule=log HEAD >actual &&
+	git diff-index -p --submodule=log HEAD >actual &&
 	cat >expected <<-EOF &&
 	Submodule sm1 contains modified content
 	EOF
@@ -337,7 +340,7 @@ test_expect_success 'submodule is modified' '
 
 test_expect_success 'modified submodule contains untracked content' '
 	echo new > sm1/new-file &&
-	git diff-index -p --submodule=log HEAD >actual &&
+	git diff-index -p  --ignore-submodules=none --submodule=log HEAD >actual &&
 	cat >expected <<-EOF &&
 	Submodule sm1 contains untracked content
 	Submodule sm1 $head6..$head8:
@@ -347,7 +350,7 @@ test_expect_success 'modified submodule contains untracked content' '
 '
 
 test_expect_success 'modified submodule contains untracked content (untracked ignored)' '
-	git diff-index -p --ignore-submodules=untracked --submodule=log HEAD >actual &&
+	git diff-index -p --submodule=log HEAD >actual &&
 	cat >expected <<-EOF &&
 	Submodule sm1 $head6..$head8:
 	  > change
@@ -371,7 +374,7 @@ test_expect_success 'modified submodule contains untracked content (all ignored)
 
 test_expect_success 'modified submodule contains untracked and modified content' '
 	echo modification >> sm1/foo6 &&
-	git diff-index -p --submodule=log HEAD >actual &&
+	git diff-index -p --ignore-submodules=none --submodule=log HEAD >actual &&
 	cat >expected <<-EOF &&
 	Submodule sm1 contains untracked content
 	Submodule sm1 contains modified content
@@ -383,7 +386,7 @@ test_expect_success 'modified submodule contains untracked and modified content'
 
 test_expect_success 'modified submodule contains untracked and modified content (untracked ignored)' '
 	echo modification >> sm1/foo6 &&
-	git diff-index -p --ignore-submodules=untracked --submodule=log HEAD >actual &&
+	git diff-index -p --submodule=log HEAD >actual &&
 	cat >expected <<-EOF &&
 	Submodule sm1 contains modified content
 	Submodule sm1 $head6..$head8:
@@ -538,7 +541,7 @@ test_expect_success 'diff --submodule with objects referenced by alternates' '
 	(cd super &&
 		(cd sub &&
 			git fetch &&
-			git checkout origin/master
+			git checkout origin/main
 		) &&
 		git diff --submodule > ../actual
 	) &&
diff --git a/t/t4042-diff-textconv-caching.sh b/t/t4042-diff-textconv-caching.sh
index bf33aed..8ebfa3c 100755
--- a/t/t4042-diff-textconv-caching.sh
+++ b/t/t4042-diff-textconv-caching.sh
@@ -118,4 +118,26 @@ test_expect_success 'log notes cache and still use cache for -p' '
 	git log --no-walk -p refs/notes/textconv/magic HEAD
 '
 
+test_expect_success 'caching is silently ignored outside repo' '
+	mkdir -p non-repo &&
+	echo one >non-repo/one &&
+	echo two >non-repo/two &&
+	echo "* diff=test" >attr &&
+	test_expect_code 1 \
+	nongit git -c core.attributesFile="$PWD/attr" \
+		   -c diff.test.textconv="tr a-z A-Z <" \
+		   -c diff.test.cachetextconv=true \
+		   diff --no-index one two >actual &&
+	cat >expect <<-\EOF &&
+	diff --git a/one b/two
+	index 5626abf..f719efd 100644
+	--- a/one
+	+++ b/two
+	@@ -1 +1 @@
+	-ONE
+	+TWO
+	EOF
+	test_cmp expect actual
+'
+
 test_done
diff --git a/t/t4044-diff-index-unique-abbrev.sh b/t/t4044-diff-index-unique-abbrev.sh
index 4701796..9f6043d 100755
--- a/t/t4044-diff-index-unique-abbrev.sh
+++ b/t/t4044-diff-index-unique-abbrev.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='test unique sha1 abbreviation on "index from..to" line'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -32,12 +34,12 @@ test_expect_success 'setup' '
 	100644 blob $(test_oid hash2)	foo
 	EOF
 
-	echo "$(test_oid val1)" > foo &&
+	test_oid val1 > foo &&
 	git add foo &&
 	git commit -m "initial" &&
 	git cat-file -p HEAD: > actual &&
 	test_cmp expect_initial actual &&
-	echo "$(test_oid val2)" > foo &&
+	test_oid val2 > foo &&
 	git commit -a -m "update" &&
 	git cat-file -p HEAD: > actual &&
 	test_cmp expect_update actual
diff --git a/t/t4045-diff-relative.sh b/t/t4045-diff-relative.sh
index 7be1de7..9b46c4c 100755
--- a/t/t4045-diff-relative.sh
+++ b/t/t4045-diff-relative.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='diff --relative tests'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -61,7 +63,7 @@ check_stat () {
 	EOF
 	test_expect_success "--stat $*" "
 		git -C '$dir' diff --stat $* HEAD^ >actual &&
-		test_i18ncmp expected actual
+		test_cmp expected actual
 	"
 }
 
@@ -162,4 +164,86 @@ check_diff_relative_option subdir file2 true --no-relative --relative
 check_diff_relative_option . file2 false --no-relative --relative=subdir
 check_diff_relative_option . file2 true --no-relative --relative=subdir
 
+test_expect_success 'external diff with --relative' '
+	test_when_finished "git reset --hard" &&
+	echo changed >file1 &&
+	echo changed >subdir/file2 &&
+
+	write_script mydiff <<-\EOF &&
+	# hacky pretend diff; the goal here is just to make sure we got
+	# passed sensible input that we _could_ diff, without relying on
+	# the specific output of a system diff tool.
+	echo "diff a/$1 b/$1" &&
+	echo "--- a/$1" &&
+	echo "+++ b/$1" &&
+	echo "@@ -1 +0,0 @@" &&
+	sed "s/^/-/" "$2" &&
+	sed "s/^/+/" "$5"
+	EOF
+
+	cat >expect <<-\EOF &&
+	diff a/file2 b/file2
+	--- a/file2
+	+++ b/file2
+	@@ -1 +0,0 @@
+	-other content
+	+changed
+	EOF
+	GIT_EXTERNAL_DIFF=./mydiff git diff --relative=subdir >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'setup diff --relative unmerged' '
+	test_commit zero file0 &&
+	test_commit base subdir/file0 &&
+	git switch -c br1 &&
+	test_commit one file0 &&
+	test_commit sub1 subdir/file0 &&
+	git switch -c br2 base &&
+	test_commit two file0 &&
+	git switch -c br3 &&
+	test_commit sub3 subdir/file0
+'
+
+test_expect_success 'diff --relative without change in subdir' '
+	git switch br2 &&
+	test_when_finished "git merge --abort" &&
+	test_must_fail git merge one &&
+	git -C subdir diff --relative >out &&
+	test_must_be_empty out &&
+	git -C subdir diff --relative --name-only >out &&
+	test_must_be_empty out
+'
+
+test_expect_success 'diff --relative --name-only with change in subdir' '
+	git switch br3 &&
+	test_when_finished "git merge --abort" &&
+	test_must_fail git merge sub1 &&
+	test_write_lines file0 file0 >expected &&
+	git -C subdir diff --relative --name-only >out &&
+	test_cmp expected out
+'
+
+test_expect_failure 'diff --relative with change in subdir' '
+	git switch br3 &&
+	br1_blob=$(git rev-parse --short --verify br1:subdir/file0) &&
+	br3_blob=$(git rev-parse --short --verify br3:subdir/file0) &&
+	test_when_finished "git merge --abort" &&
+	test_must_fail git merge br1 &&
+	cat >expected <<-EOF &&
+	diff --cc file0
+	index $br3_blob,$br1_blob..0000000
+	--- a/file0
+	+++ b/file0
+	@@@ -1,1 -1,1 +1,5 @@@
+	++<<<<<<< HEAD
+	 +sub3
+	++=======
+	+ sub1
+	++>>>>>>> br1
+	EOF
+	git -C subdir diff --relative >out &&
+	test_cmp expected out
+'
+
 test_done
diff --git a/t/t4046-diff-unmerged.sh b/t/t4046-diff-unmerged.sh
index ff7cfd8..ffaf693 100755
--- a/t/t4046-diff-unmerged.sh
+++ b/t/t4046-diff-unmerged.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='diff with unmerged index entries'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -18,7 +20,7 @@ test_expect_success setup '
 			for t in o x
 			do
 				path="$b$o$t" &&
-				case "$path" in ooo) continue ;; esac
+				case "$path" in ooo) continue ;; esac &&
 				paths="$paths$path " &&
 				p="	$path" &&
 				case "$b" in x) echo "$m1$p" ;; esac &&
@@ -37,7 +39,7 @@ test_expect_success 'diff-files -0' '
 	for path in $paths
 	do
 		>"$path" &&
-		echo ":000000 100644 $ZERO_OID $ZERO_OID U	$path"
+		echo ":000000 100644 $ZERO_OID $ZERO_OID U	$path" || return 1
 	done >diff-files-0.expect &&
 	git diff-files -0 >diff-files-0.actual &&
 	test_cmp diff-files-0.expect diff-files-0.actual
@@ -50,7 +52,7 @@ test_expect_success 'diff-files -1' '
 		echo ":000000 100644 $ZERO_OID $ZERO_OID U	$path" &&
 		case "$path" in
 		x??) echo ":100644 100644 $blob1 $ZERO_OID M	$path"
-		esac
+		esac || return 1
 	done >diff-files-1.expect &&
 	git diff-files -1 >diff-files-1.actual &&
 	test_cmp diff-files-1.expect diff-files-1.actual
@@ -63,7 +65,7 @@ test_expect_success 'diff-files -2' '
 		echo ":000000 100644 $ZERO_OID $ZERO_OID U	$path" &&
 		case "$path" in
 		?x?) echo ":100644 100644 $blob2 $ZERO_OID M	$path"
-		esac
+		esac || return 1
 	done >diff-files-2.expect &&
 	git diff-files -2 >diff-files-2.actual &&
 	test_cmp diff-files-2.expect diff-files-2.actual &&
@@ -78,10 +80,20 @@ test_expect_success 'diff-files -3' '
 		echo ":000000 100644 $ZERO_OID $ZERO_OID U	$path" &&
 		case "$path" in
 		??x) echo ":100644 100644 $blob3 $ZERO_OID M	$path"
-		esac
+		esac || return 1
 	done >diff-files-3.expect &&
 	git diff-files -3 >diff-files-3.actual &&
 	test_cmp diff-files-3.expect diff-files-3.actual
 '
 
+test_expect_success 'diff --stat' '
+	for path in $paths
+	do
+		echo " $path | Unmerged" || return 1
+	done >diff-stat.expect &&
+	echo " 0 files changed" >>diff-stat.expect &&
+	git diff --cached --stat >diff-stat.actual &&
+	test_cmp diff-stat.expect diff-stat.actual
+'
+
 test_done
diff --git a/t/t4047-diff-dirstat.sh b/t/t4047-diff-dirstat.sh
index 7fec2cb..7b73462 100755
--- a/t/t4047-diff-dirstat.sh
+++ b/t/t4047-diff-dirstat.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='diff --dirstat tests'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # set up two commits where the second commit has these files
@@ -941,37 +943,37 @@ test_expect_success '--dirstat=future_param,lines,0 should fail loudly' '
 	test_must_fail git diff --dirstat=future_param,lines,0 HEAD^..HEAD >actual_diff_dirstat 2>actual_error &&
 	test_debug "cat actual_error" &&
 	test_must_be_empty actual_diff_dirstat &&
-	test_i18ngrep -q "future_param" actual_error &&
-	test_i18ngrep -q "\--dirstat" actual_error
+	test_grep -q "future_param" actual_error &&
+	test_grep -q "\--dirstat" actual_error
 '
 
 test_expect_success '--dirstat=dummy1,cumulative,2dummy should report both unrecognized parameters' '
 	test_must_fail git diff --dirstat=dummy1,cumulative,2dummy HEAD^..HEAD >actual_diff_dirstat 2>actual_error &&
 	test_debug "cat actual_error" &&
 	test_must_be_empty actual_diff_dirstat &&
-	test_i18ngrep -q "dummy1" actual_error &&
-	test_i18ngrep -q "2dummy" actual_error &&
-	test_i18ngrep -q "\--dirstat" actual_error
+	test_grep -q "dummy1" actual_error &&
+	test_grep -q "2dummy" actual_error &&
+	test_grep -q "\--dirstat" actual_error
 '
 
 test_expect_success 'diff.dirstat=future_param,0,lines should warn, but still work' '
 	git -c diff.dirstat=future_param,0,lines diff --dirstat HEAD^..HEAD >actual_diff_dirstat 2>actual_error &&
 	test_debug "cat actual_error" &&
 	test_cmp expect_diff_dirstat actual_diff_dirstat &&
-	test_i18ngrep -q "future_param" actual_error &&
-	test_i18ngrep -q "diff\\.dirstat" actual_error &&
+	test_grep -q "future_param" actual_error &&
+	test_grep -q "diff\\.dirstat" actual_error &&
 
 	git -c diff.dirstat=future_param,0,lines diff --dirstat -M HEAD^..HEAD >actual_diff_dirstat_M 2>actual_error &&
 	test_debug "cat actual_error" &&
 	test_cmp expect_diff_dirstat_M actual_diff_dirstat_M &&
-	test_i18ngrep -q "future_param" actual_error &&
-	test_i18ngrep -q "diff\\.dirstat" actual_error &&
+	test_grep -q "future_param" actual_error &&
+	test_grep -q "diff\\.dirstat" actual_error &&
 
 	git -c diff.dirstat=future_param,0,lines diff --dirstat -C -C HEAD^..HEAD >actual_diff_dirstat_CC 2>actual_error &&
 	test_debug "cat actual_error" &&
 	test_cmp expect_diff_dirstat_CC actual_diff_dirstat_CC &&
-	test_i18ngrep -q "future_param" actual_error &&
-	test_i18ngrep -q "diff\\.dirstat" actual_error
+	test_grep -q "future_param" actual_error &&
+	test_grep -q "diff\\.dirstat" actual_error
 '
 
 test_expect_success '--shortstat --dirstat should output only one dirstat' '
diff --git a/t/t4048-diff-combined-binary.sh b/t/t4048-diff-combined-binary.sh
index 7f9ad9f..0260cf6 100755
--- a/t/t4048-diff-combined-binary.sh
+++ b/t/t4048-diff-combined-binary.sh
@@ -1,6 +1,9 @@
 #!/bin/sh
 
 test_description='combined and merge diff handle binary files and textconv'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 test_expect_success 'setup binary merge conflict' '
@@ -14,7 +17,7 @@ test_expect_success 'setup binary merge conflict' '
 	echo threeQ3 | q_to_nul >binary &&
 	git commit -a -m three &&
 	three=$(git rev-parse --short HEAD:binary) &&
-	test_must_fail git merge master &&
+	test_must_fail git merge main &&
 	echo resolvedQhooray | q_to_nul >binary &&
 	git commit -a -m resolved &&
 	res=$(git rev-parse --short HEAD:binary)
@@ -62,14 +65,14 @@ test_expect_success 'diff --cc indicates binary-ness' '
 '
 
 test_expect_success 'setup non-binary with binary attribute' '
-	git checkout master &&
+	git checkout main &&
 	test_commit one text &&
 	test_commit two text &&
 	two=$(git rev-parse --short HEAD:text) &&
 	git checkout -b branch-text HEAD^ &&
 	test_commit three text &&
 	three=$(git rev-parse --short HEAD:text) &&
-	test_must_fail git merge master &&
+	test_must_fail git merge main &&
 	test_commit resolved text &&
 	res=$(git rev-parse --short HEAD:text) &&
 	echo text -diff >.gitattributes
@@ -206,11 +209,11 @@ index $three,$two..0000000
  +THREE
 ++=======
 + TWO
-++>>>>>>> MASTER
+++>>>>>>> MAIN
 EOF
 test_expect_success 'diff --cc respects textconv on worktree file' '
 	git reset --hard HEAD^ &&
-	test_must_fail git merge master &&
+	test_must_fail git merge main &&
 	git diff >actual &&
 	test_cmp expect actual
 '
diff --git a/t/t4049-diff-stat-count.sh b/t/t4049-diff-stat-count.sh
index a341217..0a4fc73 100755
--- a/t/t4049-diff-stat-count.sh
+++ b/t/t4049-diff-stat-count.sh
@@ -2,6 +2,8 @@
 # Copyright (c) 2011, Google Inc.
 
 test_description='diff --stat-count'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -25,7 +27,7 @@ test_expect_success 'mode-only change show as a 0-line change' '
 	 4 files changed, 2 insertions(+)
 	EOF
 	git diff --stat --stat-count=2 HEAD >actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 test_expect_success 'binary changes do not count in lines' '
@@ -40,7 +42,7 @@ test_expect_success 'binary changes do not count in lines' '
 	 3 files changed, 2 insertions(+)
 	EOF
 	git diff --stat --stat-count=2 >actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 test_expect_success 'exclude unmerged entries from total file count' '
@@ -51,7 +53,7 @@ test_expect_success 'exclude unmerged entries from total file count' '
 	git rm -f d &&
 	for stage in 1 2 3
 	do
-		sed -e "s/ 0	a/ $stage	d/" x
+		sed -e "s/ 0	a/ $stage	d/" x || return 1
 	done |
 	git update-index --index-info &&
 	echo d >d &&
@@ -62,7 +64,7 @@ test_expect_success 'exclude unmerged entries from total file count' '
 	 3 files changed, 3 insertions(+)
 	EOF
 	git diff --stat --stat-count=2 >actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 test_done
diff --git a/t/t4050-diff-histogram.sh b/t/t4050-diff-histogram.sh
index fd3e86a..c61b30f 100755
--- a/t/t4050-diff-histogram.sh
+++ b/t/t4050-diff-histogram.sh
@@ -2,6 +2,7 @@
 
 test_description='histogram diff algorithm'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-diff-alternative.sh
 
diff --git a/t/t4051-diff-function-context.sh b/t/t4051-diff-function-context.sh
index 4838a1d..725278a 100755
--- a/t/t4051-diff-function-context.sh
+++ b/t/t4051-diff-function-context.sh
@@ -2,6 +2,7 @@
 
 test_description='diff function context'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 dir="$TEST_DIRECTORY/t4051"
diff --git a/t/t4052-stat-output.sh b/t/t4052-stat-output.sh
index 28c0538..7badd72 100755
--- a/t/t4052-stat-output.sh
+++ b/t/t4052-stat-output.sh
@@ -5,10 +5,14 @@
 
 test_description='test --stat output of various commands'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-terminal.sh
 
-# 120 character name
+# 120-character name
 name=aaaaaaaaaa
 name=$name$name$name$name$name$name$name$name$name$name$name$name
 test_expect_success 'preparation' '
@@ -45,12 +49,41 @@ log -1 --stat
 EOF
 
 cat >expect.60 <<-'EOF'
- ...aaaaaaaaaaaaaaaaaaaaaaaaaaaaa | 1 +
+ ...aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa | 1 +
 EOF
 cat >expect.6030 <<-'EOF'
  ...aaaaaaaaaaaaaaaaaaaaaaaaaaa | 1 +
 EOF
-cat >expect2.60 <<-'EOF'
+while read verb expect cmd args
+do
+	# No width limit applied when statNameWidth is ignored
+	case "$expect" in expect72|expect.6030)
+		test_expect_success "$cmd $verb diff.statNameWidth with long name" '
+			git -c diff.statNameWidth=30 $cmd $args >output &&
+			grep " | " output >actual &&
+			test_cmp $expect actual
+		';;
+	esac
+	# Maximum width limit still applied when statNameWidth is ignored
+	case "$expect" in expect.60|expect.6030)
+		test_expect_success "$cmd --stat=width $verb diff.statNameWidth with long name" '
+			git -c diff.statNameWidth=30 $cmd $args --stat=60 >output &&
+			grep " | " output >actual &&
+			test_cmp $expect actual
+		';;
+	esac
+done <<\EOF
+ignores expect72 format-patch -1 --stdout
+ignores expect.60 format-patch -1 --stdout
+respects expect.6030 diff HEAD^ HEAD --stat
+respects expect.6030 show --stat
+respects expect.6030 log -1 --stat
+EOF
+
+cat >expect.40 <<-'EOF'
+ ...aaaaaaaaaaaaaaaaaaaaaaaaaaaaa | 1 +
+EOF
+cat >expect2.40 <<-'EOF'
  ...aaaaaaaaaaaaaaaaaaaaaaaaaaaaa | 1 +
  ...aaaaaaaaaaaaaaaaaaaaaaaaaaaaa | 1 +
 EOF
@@ -63,22 +96,22 @@ do
 	test_expect_success "$cmd --stat=width: a long name is given more room when the bar is short" '
 		git $cmd $args --stat=40 >output &&
 		grep " | " output >actual &&
-		test_cmp $expect.60 actual
+		test_cmp $expect.40 actual
 	'
 
 	test_expect_success "$cmd --stat-width=width with long name" '
 		git $cmd $args --stat-width=40 >output &&
 		grep " | " output >actual &&
-		test_cmp $expect.60 actual
+		test_cmp $expect.40 actual
 	'
 
-	test_expect_success "$cmd --stat=...,name-width with long name" '
+	test_expect_success "$cmd --stat=width,name-width with long name" '
 		git $cmd $args --stat=60,30 >output &&
 		grep " | " output >actual &&
 		test_cmp $expect.6030 actual
 	'
 
-	test_expect_success "$cmd --stat-name-width with long name" '
+	test_expect_success "$cmd --stat-name-width=width with long name" '
 		git $cmd $args --stat-name-width=30 >output &&
 		grep " | " output >actual &&
 		test_cmp $expect.6030 actual
@@ -90,15 +123,14 @@ expect show --stat
 expect log -1 --stat
 EOF
 
-
-test_expect_success 'preparation for big change tests' '
+test_expect_success 'preparation for big-change tests' '
 	>abcd &&
 	git add abcd &&
 	git commit -m message &&
 	i=0 &&
 	while test $i -lt 1000
 	do
-		echo $i && i=$(($i + 1))
+		echo $i && i=$(($i + 1)) || return 1
 	done >abcd &&
 	git commit -m message abcd
 '
@@ -107,7 +139,7 @@ cat >expect72 <<'EOF'
  abcd | 1000 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  abcd | 1000 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 EOF
-test_expect_success "format-patch --cover-letter ignores COLUMNS (big change)" '
+test_expect_success "format-patch --cover-letter ignores COLUMNS with big change" '
 	COLUMNS=200 git format-patch -1 --stdout --cover-letter >output &&
 	grep " | " output >actual &&
 	test_cmp expect72 actual
@@ -127,7 +159,7 @@ cat >expect200-graph <<'EOF'
 EOF
 while read verb expect cmd args
 do
-	test_expect_success "$cmd $verb COLUMNS (big change)" '
+	test_expect_success "$cmd $verb COLUMNS with big change" '
 		COLUMNS=200 git $cmd $args >output &&
 		grep " | " output >actual &&
 		test_cmp "$expect" actual
@@ -135,7 +167,7 @@ do
 
 	case "$cmd" in diff|show) continue;; esac
 
-	test_expect_success "$cmd --graph $verb COLUMNS (big change)" '
+	test_expect_success "$cmd --graph $verb COLUMNS with big change" '
 		COLUMNS=200 git $cmd $args --graph >output &&
 		grep " | " output >actual &&
 		test_cmp "$expect-graph" actual
@@ -155,7 +187,7 @@ cat >expect40-graph <<'EOF'
 EOF
 while read verb expect cmd args
 do
-	test_expect_success "$cmd $verb not enough COLUMNS (big change)" '
+	test_expect_success "$cmd $verb not enough COLUMNS with big change" '
 		COLUMNS=40 git $cmd $args >output &&
 		grep " | " output >actual &&
 		test_cmp "$expect" actual
@@ -163,7 +195,7 @@ do
 
 	case "$cmd" in diff|show) continue;; esac
 
-	test_expect_success "$cmd --graph $verb not enough COLUMNS (big change)" '
+	test_expect_success "$cmd --graph $verb not enough COLUMNS with big change" '
 		COLUMNS=40 git $cmd $args --graph >output &&
 		grep " | " output >actual &&
 		test_cmp "$expect-graph" actual
@@ -183,7 +215,7 @@ cat >expect40-graph <<'EOF'
 EOF
 while read verb expect cmd args
 do
-	test_expect_success "$cmd $verb statGraphWidth config" '
+	test_expect_success "$cmd $verb diff.statGraphWidth" '
 		git -c diff.statGraphWidth=26 $cmd $args >output &&
 		grep " | " output >actual &&
 		test_cmp "$expect" actual
@@ -191,7 +223,7 @@ do
 
 	case "$cmd" in diff|show) continue;; esac
 
-	test_expect_success "$cmd --graph $verb statGraphWidth config" '
+	test_expect_success "$cmd --graph $verb diff.statGraphWidth" '
 		git -c diff.statGraphWidth=26 $cmd $args --graph >output &&
 		grep " | " output >actual &&
 		test_cmp "$expect-graph" actual
@@ -203,7 +235,6 @@ respects expect40 show --stat
 respects expect40 log -1 --stat
 EOF
 
-
 cat >expect <<'EOF'
  abcd | 1000 ++++++++++++++++++++++++++
 EOF
@@ -224,7 +255,7 @@ do
 		test_cmp expect actual
 	'
 
-	test_expect_success "$cmd --stat-graph-width with big change" '
+	test_expect_success "$cmd --stat-graph-width=width with big change" '
 		git $cmd $args --stat-graph-width=26 >output &&
 		grep " | " output >actual &&
 		test_cmp expect actual
@@ -238,7 +269,7 @@ do
 		test_cmp expect-graph actual
 	'
 
-	test_expect_success "$cmd --stat-graph-width --graph with big change" '
+	test_expect_success "$cmd --stat-graph-width=width --graph with big change" '
 		git $cmd $args --stat-graph-width=26 --graph >output &&
 		grep " | " output >actual &&
 		test_cmp expect-graph actual
@@ -250,7 +281,7 @@ show --stat
 log -1 --stat
 EOF
 
-test_expect_success 'preparation for long filename tests' '
+test_expect_success 'preparation for long-name tests' '
 	cp abcd aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa &&
 	git add aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa &&
 	git commit -m message
@@ -298,7 +329,7 @@ cat >expect200-graph <<'EOF'
 EOF
 while read verb expect cmd args
 do
-	test_expect_success "$cmd $verb COLUMNS (long filename)" '
+	test_expect_success "$cmd $verb COLUMNS with long name" '
 		COLUMNS=200 git $cmd $args >output &&
 		grep " | " output >actual &&
 		test_cmp "$expect" actual
@@ -306,7 +337,7 @@ do
 
 	case "$cmd" in diff|show) continue;; esac
 
-	test_expect_success "$cmd --graph $verb COLUMNS (long filename)" '
+	test_expect_success "$cmd --graph $verb COLUMNS with long name" '
 		COLUMNS=200 git $cmd $args --graph >output &&
 		grep " | " output >actual &&
 		test_cmp "$expect-graph" actual
@@ -327,7 +358,7 @@ EOF
 while read verb expect cmd args
 do
 	test_expect_success COLUMNS_CAN_BE_1 \
-		"$cmd $verb prefix greater than COLUMNS (big change)" '
+		"$cmd $verb prefix greater than COLUMNS with big change" '
 		COLUMNS=1 git $cmd $args >output &&
 		grep " | " output >actual &&
 		test_cmp "$expect" actual
@@ -336,7 +367,7 @@ do
 	case "$cmd" in diff|show) continue;; esac
 
 	test_expect_success COLUMNS_CAN_BE_1 \
-		"$cmd --graph $verb prefix greater than COLUMNS (big change)" '
+		"$cmd --graph $verb prefix greater than COLUMNS with big change" '
 		COLUMNS=1 git $cmd $args --graph >output &&
 		grep " | " output >actual &&
 		test_cmp "$expect-graph" actual
@@ -351,9 +382,15 @@ EOF
 cat >expect <<'EOF'
  abcd | 1000 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 EOF
-test_expect_success 'merge --stat respects COLUMNS (big change)' '
-	git checkout -b branch HEAD^^ &&
-	COLUMNS=100 git merge --stat --no-ff master^ >output &&
+test_expect_success 'merge --stat respects diff.statGraphWidth with big change' '
+	git checkout -b branch1 HEAD^^ &&
+	git -c diff.statGraphWidth=26 merge --stat --no-ff main^ >output &&
+	grep " | " output >actual &&
+	test_cmp expect40 actual
+'
+test_expect_success 'merge --stat respects COLUMNS with big change' '
+	git checkout -b branch2 HEAD^^ &&
+	COLUMNS=100 git merge --stat --no-ff main^ >output &&
 	grep " | " output >actual &&
 	test_cmp expect actual
 '
@@ -361,8 +398,18 @@ test_expect_success 'merge --stat respects COLUMNS (big change)' '
 cat >expect <<'EOF'
  aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa | 1000 +++++++++++++++++++++++++++++++++++++++
 EOF
-test_expect_success 'merge --stat respects COLUMNS (long filename)' '
-	COLUMNS=100 git merge --stat --no-ff master >output &&
+cat >expect.30 <<'EOF'
+ ...aaaaaaaaaaaaaaaaaaaaaaaaaaa | 1000 ++++++++++++++++++++++++++++++++++++++++
+EOF
+test_expect_success 'merge --stat respects diff.statNameWidth with long name' '
+	git switch branch1 &&
+	git -c diff.statNameWidth=30 merge --stat --no-ff main >output &&
+	grep " | " output >actual &&
+	test_cmp expect.30 actual
+'
+test_expect_success 'merge --stat respects COLUMNS with long name' '
+	git switch branch2 &&
+	COLUMNS=100 git merge --stat --no-ff main >output &&
 	grep " | " output >actual &&
 	test_cmp expect actual
 '
diff --git a/t/t4053-diff-no-index.sh b/t/t4053-diff-no-index.sh
index 0168946..651ec77 100755
--- a/t/t4053-diff-no-index.sh
+++ b/t/t4053-diff-no-index.sh
@@ -2,6 +2,7 @@
 
 test_description='diff --no-index'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -16,6 +17,11 @@ test_expect_success 'setup' '
 	echo 1 >non/git/b
 '
 
+test_expect_success 'git diff --no-index --exit-code' '
+	git diff --no-index --exit-code a/1 non/git/a &&
+	test_expect_code 1 git diff --no-index --exit-code a/1 a/2
+'
+
 test_expect_success 'git diff --no-index directories' '
 	test_expect_code 1 git diff --no-index a b >cnt &&
 	test_line_count = 14 cnt
@@ -50,7 +56,7 @@ test_expect_success 'git diff --no-index executed outside repo gives correct err
 		export GIT_CEILING_DIRECTORIES &&
 		cd non/git &&
 		test_must_fail git diff --no-index a 2>actual.err &&
-		test_i18ngrep "usage: git diff --no-index" actual.err
+		test_grep "usage: git diff --no-index" actual.err
 	)
 '
 
@@ -144,4 +150,150 @@ test_expect_success 'diff --no-index allows external diff' '
 	test_cmp expect actual
 '
 
+test_expect_success 'diff --no-index normalizes mode: no changes' '
+	echo foo >x &&
+	cp x y &&
+	git diff --no-index x y >out &&
+	test_must_be_empty out
+'
+
+test_expect_success POSIXPERM 'diff --no-index normalizes mode: chmod +x' '
+	chmod +x y &&
+	cat >expected <<-\EOF &&
+	diff --git a/x b/y
+	old mode 100644
+	new mode 100755
+	EOF
+	test_expect_code 1 git diff --no-index x y >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success POSIXPERM 'diff --no-index normalizes: mode not like git mode' '
+	chmod 666 x &&
+	chmod 777 y &&
+	cat >expected <<-\EOF &&
+	diff --git a/x b/y
+	old mode 100644
+	new mode 100755
+	EOF
+	test_expect_code 1 git diff --no-index x y >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success POSIXPERM,SYMLINKS 'diff --no-index normalizes: mode not like git mode (symlink)' '
+	ln -s y z &&
+	X_OID=$(git hash-object --stdin <x) &&
+	Z_OID=$(printf y | git hash-object --stdin) &&
+	cat >expected <<-EOF &&
+	diff --git a/x b/x
+	deleted file mode 100644
+	index $X_OID..$ZERO_OID
+	--- a/x
+	+++ /dev/null
+	@@ -1 +0,0 @@
+	-foo
+	diff --git a/z b/z
+	new file mode 120000
+	index $ZERO_OID..$Z_OID
+	--- /dev/null
+	+++ b/z
+	@@ -0,0 +1 @@
+	+y
+	\ No newline at end of file
+	EOF
+	test_expect_code 1 git -c core.abbrev=no diff --no-index x z >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success POSIXPERM 'external diff with mode-only change' '
+	echo content >not-executable &&
+	echo content >executable &&
+	chmod +x executable &&
+	echo executable executable $(test_oid zero) 100755 \
+		not-executable $(test_oid zero) 100644 not-executable \
+		>expect &&
+	test_expect_code 1 git -c diff.external=echo diff \
+		--no-index executable not-executable >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success "diff --no-index treats '-' as stdin" '
+	cat >expect <<-EOF &&
+	diff --git a/- b/a/1
+	index $ZERO_OID..$(git hash-object --stdin <a/1) 100644
+	--- a/-
+	+++ b/a/1
+	@@ -1 +1 @@
+	-x
+	+1
+	EOF
+
+	test_write_lines x | test_expect_code 1 \
+		git -c core.abbrev=no diff --no-index -- - a/1 >actual &&
+	test_cmp expect actual &&
+
+	test_write_lines 1 | git diff --no-index -- a/1 - >actual &&
+	test_must_be_empty actual
+'
+
+test_expect_success "diff --no-index -R treats '-' as stdin" '
+	cat >expect <<-EOF &&
+	diff --git b/a/1 a/-
+	index $(git hash-object --stdin <a/1)..$ZERO_OID 100644
+	--- b/a/1
+	+++ a/-
+	@@ -1 +1 @@
+	-1
+	+x
+	EOF
+
+	test_write_lines x | test_expect_code 1 \
+		git -c core.abbrev=no diff --no-index -R -- - a/1 >actual &&
+	test_cmp expect actual &&
+
+	test_write_lines 1 | git diff --no-index -R -- a/1 - >actual &&
+	test_must_be_empty actual
+'
+
+test_expect_success 'diff --no-index refuses to diff stdin and a directory' '
+	test_must_fail git diff --no-index -- - a </dev/null 2>err &&
+	grep "fatal: cannot compare stdin to a directory" err
+'
+
+test_expect_success PIPE 'diff --no-index refuses to diff a named pipe and a directory' '
+	test_when_finished "rm -f pipe" &&
+	mkfifo pipe &&
+	test_must_fail git diff --no-index -- pipe a 2>err &&
+	grep "fatal: cannot compare a named pipe to a directory" err
+'
+
+test_expect_success PIPE,SYMLINKS 'diff --no-index reads from pipes' '
+	test_when_finished "rm -f old new new-link" &&
+	mkfifo old &&
+	mkfifo new &&
+	ln -s new new-link &&
+	{
+		(test_write_lines a b c >old) &
+	} &&
+	test_when_finished "kill $! || :" &&
+	{
+		(test_write_lines a x c >new) &
+	} &&
+	test_when_finished "kill $! || :" &&
+
+	cat >expect <<-EOF &&
+	diff --git a/old b/new-link
+	--- a/old
+	+++ b/new-link
+	@@ -1,3 +1,3 @@
+	 a
+	-b
+	+x
+	 c
+	EOF
+
+	test_expect_code 1 git diff --no-index old new-link >actual &&
+	test_cmp expect actual
+'
+
 test_done
diff --git a/t/t4054-diff-bogus-tree.sh b/t/t4054-diff-bogus-tree.sh
index 8c95f15..05c88f8 100755
--- a/t/t4054-diff-bogus-tree.sh
+++ b/t/t4054-diff-bogus-tree.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='test diff with a bogus tree containing the null sha1'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'create bogus tree' '
@@ -8,7 +10,7 @@ test_expect_success 'create bogus tree' '
 	bogus_tree=$(
 		printf "100644 fooQ$name" |
 		q_to_nul |
-		git hash-object -w --stdin -t tree
+		git hash-object --literally -w --stdin -t tree
 	)
 '
 
diff --git a/t/t4055-diff-context.sh b/t/t4055-diff-context.sh
index 741e080..3ea9ae9 100755
--- a/t/t4055-diff-context.sh
+++ b/t/t4055-diff-context.sh
@@ -5,6 +5,7 @@
 
 test_description='diff.context configuration'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -73,13 +74,13 @@ test_expect_success 'plumbing not affected' '
 test_expect_success 'non-integer config parsing' '
 	git config diff.context no &&
 	test_must_fail git diff 2>output &&
-	test_i18ngrep "bad numeric config value" output
+	test_grep "bad numeric config value" output
 '
 
 test_expect_success 'negative integer config parsing' '
 	git config diff.context -1 &&
 	test_must_fail git diff 2>output &&
-	test_i18ngrep "bad config variable" output
+	test_grep "bad config variable" output
 '
 
 test_expect_success '-U0 is valid, so is diff.context=0' '
diff --git a/t/t4056-diff-order.sh b/t/t4056-diff-order.sh
index 43dd474..aec1d9d 100755
--- a/t/t4056-diff-order.sh
+++ b/t/t4056-diff-order.sh
@@ -1,6 +1,9 @@
 #!/bin/sh
 
-test_description='diff order'
+test_description='diff order & rotate'
+
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 . ./test-lib.sh
 
@@ -106,7 +109,7 @@ done
 test_expect_success 'setup for testing combine-diff order' '
 	git checkout -b tmp HEAD~ &&
 	create_files 3 &&
-	git checkout master &&
+	git checkout main &&
 	git merge --no-commit -s ours tmp &&
 	create_files 5
 '
@@ -124,4 +127,74 @@ do
 	'
 done
 
+### rotate and skip
+
+test_expect_success 'rotate and skip setup' '
+	>sample1.t &&
+	>sample2.t &&
+	>sample3.t &&
+	>sample4.t &&
+	git add sample[1234].t &&
+	git commit -m "added" sample[1234].t &&
+	echo modified >>sample1.t &&
+	echo modified >>sample2.t &&
+	echo modified >>sample4.t &&
+	git commit -m "updated" sample[1234].t
+'
+
+test_expect_success 'diff --rotate-to' '
+	git diff --rotate-to=sample2.t --name-only HEAD^ >actual &&
+	test_write_lines sample2.t sample4.t sample1.t >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'diff --skip-to' '
+	git diff --skip-to=sample2.t --name-only HEAD^ >actual &&
+	test_write_lines sample2.t sample4.t >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'diff --rotate/skip-to error condition' '
+	test_must_fail git diff --rotate-to=sample3.t HEAD^ &&
+	test_must_fail git diff --skip-to=sample3.t HEAD^
+'
+
+test_expect_success 'log --rotate-to' '
+	git log --rotate-to=sample3.t --raw HEAD~2.. >raw &&
+	# just distill the commit header and paths
+	sed -n -e "s/^commit.*/commit/p" \
+	       -e "/^:/s/^.*	//p" raw >actual &&
+
+	cat >expect <<-\EOF &&
+	commit
+	sample4.t
+	sample1.t
+	sample2.t
+	commit
+	sample3.t
+	sample4.t
+	sample1.t
+	sample2.t
+	EOF
+
+	test_cmp expect actual
+'
+
+test_expect_success 'log --skip-to' '
+	git log --skip-to=sample3.t --raw HEAD~2.. >raw &&
+	# just distill the commit header and paths
+	sed -n -e "s/^commit.*/commit/p" \
+	       -e "/^:/s/^.*	//p" raw >actual &&
+
+	cat >expect <<-\EOF &&
+	commit
+	sample4.t
+	commit
+	sample3.t
+	sample4.t
+	EOF
+
+	test_cmp expect actual
+'
+
 test_done
diff --git a/t/t4057-diff-combined-paths.sh b/t/t4057-diff-combined-paths.sh
index 0b78573..9a7505c 100755
--- a/t/t4057-diff-combined-paths.sh
+++ b/t/t4057-diff-combined-paths.sh
@@ -2,6 +2,10 @@
 
 test_description='combined diff show only paths that are different to all parents'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # verify that diffc.expect matches output of
@@ -15,18 +19,18 @@ test_expect_success 'trivial merge - combine-diff empty' '
 	for i in $(test_seq 1 9)
 	do
 		echo $i >$i.txt &&
-		git add $i.txt
+		git add $i.txt || return 1
 	done &&
 	git commit -m "init" &&
 	git checkout -b side &&
 	for i in $(test_seq 2 9)
 	do
-		echo $i/2 >>$i.txt
+		echo $i/2 >>$i.txt || return 1
 	done &&
 	git commit -a -m "side 2-9" &&
-	git checkout master &&
+	git checkout main &&
 	echo 1/2 >1.txt &&
-	git commit -a -m "master 1" &&
+	git commit -a -m "main 1" &&
 	git merge side &&
 	>diffc.expect &&
 	diffc_verify
@@ -37,23 +41,23 @@ test_expect_success 'only one truly conflicting path' '
 	git checkout side &&
 	for i in $(test_seq 2 9)
 	do
-		echo $i/3 >>$i.txt
+		echo $i/3 >>$i.txt || return 1
 	done &&
 	echo "4side" >>4.txt &&
 	git commit -a -m "side 2-9 +4" &&
-	git checkout master &&
+	git checkout main &&
 	for i in $(test_seq 1 9)
 	do
-		echo $i/3 >>$i.txt
+		echo $i/3 >>$i.txt || return 1
 	done &&
-	echo "4master" >>4.txt &&
-	git commit -a -m "master 1-9 +4" &&
+	echo "4main" >>4.txt &&
+	git commit -a -m "main 1-9 +4" &&
 	test_must_fail git merge side &&
 	cat <<-\EOF >4.txt &&
 	4
 	4/2
 	4/3
-	4master
+	4main
 	4side
 	EOF
 	git add 4.txt &&
@@ -66,15 +70,15 @@ test_expect_success 'merge introduces new file' '
 	git checkout side &&
 	for i in $(test_seq 5 9)
 	do
-		echo $i/4 >>$i.txt
+		echo $i/4 >>$i.txt || return 1
 	done &&
 	git commit -a -m "side 5-9" &&
-	git checkout master &&
+	git checkout main &&
 	for i in $(test_seq 1 3)
 	do
-		echo $i/4 >>$i.txt
+		echo $i/4 >>$i.txt || return 1
 	done &&
-	git commit -a -m "master 1-3 +4hello" &&
+	git commit -a -m "main 1-3 +4hello" &&
 	git merge side &&
 	echo "Hello World" >4hello.txt &&
 	git add 4hello.txt &&
@@ -87,15 +91,15 @@ test_expect_success 'merge removed a file' '
 	git checkout side &&
 	for i in $(test_seq 5 9)
 	do
-		echo $i/5 >>$i.txt
+		echo $i/5 >>$i.txt || return 1
 	done &&
 	git commit -a -m "side 5-9" &&
-	git checkout master &&
+	git checkout main &&
 	for i in $(test_seq 1 3)
 	do
-		echo $i/4 >>$i.txt
+		echo $i/4 >>$i.txt || return 1
 	done &&
-	git commit -a -m "master 1-3" &&
+	git commit -a -m "main 1-3" &&
 	git merge side &&
 	git rm 4.txt &&
 	git commit --amend &&
diff --git a/t/t4058-diff-duplicates.sh b/t/t4058-diff-duplicates.sh
index c24ee17..2501c89 100755
--- a/t/t4058-diff-duplicates.sh
+++ b/t/t4058-diff-duplicates.sh
@@ -1,5 +1,14 @@
 #!/bin/sh
 
+# NOTICE:
+#   This testsuite does a number of diffs and checks that the output match.
+#   However, it is a "garbage in, garbage out" situation; the trees have
+#   duplicate entries for individual paths, and it results in diffs that do
+#   not make much sense.  As such, it is not clear that the diffs are
+#   "correct".  The primary purpose of these tests was to verify that
+#   diff-tree does not segfault, but there is perhaps some value in ensuring
+#   that the diff output isn't wildly unreasonable.
+
 test_description='test tree diff when trees have duplicate entries'
 . ./test-lib.sh
 
@@ -20,7 +29,7 @@ make_tree () {
 		make_tree_entry "$1" "$2" "$3"
 		shift; shift; shift
 	done |
-	git hash-object -w -t tree --stdin
+	git hash-object --literally -w -t tree --stdin
 }
 
 # this is kind of a convoluted setup, but matches
@@ -57,7 +66,16 @@ test_expect_success 'create trees with duplicate entries' '
 	git tag two $outer_two
 '
 
-test_expect_success 'diff-tree between trees' '
+test_expect_success 'create tree without duplicate entries' '
+	blob_one=$(echo one | git hash-object -w --stdin) &&
+	outer_three=$(make_tree \
+		100644 renamed $blob_one
+	) &&
+	git tag three $outer_three
+'
+
+test_expect_success 'diff-tree between duplicate trees' '
+	# See NOTICE at top of file
 	{
 		printf ":000000 100644 $ZERO_OID $blob_two A\touter/inner\n" &&
 		printf ":000000 100644 $ZERO_OID $blob_two A\touter/inner\n" &&
@@ -71,9 +89,101 @@ test_expect_success 'diff-tree between trees' '
 '
 
 test_expect_success 'diff-tree with renames' '
-	# same expectation as above, since we disable rename detection
+	# See NOTICE at top of file.
 	git diff-tree -M -r --no-abbrev one two >actual &&
+	test_must_be_empty actual
+'
+
+test_expect_success 'diff-tree FROM duplicate tree' '
+	# See NOTICE at top of file.
+	{
+		printf ":100644 000000 $blob_one $ZERO_OID D\touter/inner\n" &&
+		printf ":100644 000000 $blob_two $ZERO_OID D\touter/inner\n" &&
+		printf ":100644 000000 $blob_two $ZERO_OID D\touter/inner\n" &&
+		printf ":100644 000000 $blob_two $ZERO_OID D\touter/inner\n" &&
+		printf ":000000 100644 $ZERO_OID $blob_one A\trenamed\n"
+	} >expect &&
+	git diff-tree -r --no-abbrev one three >actual &&
 	test_cmp expect actual
 '
 
+test_expect_success 'diff-tree FROM duplicate tree, with renames' '
+	# See NOTICE at top of file.
+	{
+		printf ":100644 000000 $blob_two $ZERO_OID D\touter/inner\n" &&
+		printf ":100644 000000 $blob_two $ZERO_OID D\touter/inner\n" &&
+		printf ":100644 000000 $blob_two $ZERO_OID D\touter/inner\n" &&
+		printf ":100644 100644 $blob_one $blob_one R100\touter/inner\trenamed\n"
+	} >expect &&
+	git diff-tree -M -r --no-abbrev one three >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'create a few commits' '
+	git commit-tree -m "Duplicate Entries" two^{tree} >commit_id &&
+	git branch base $(cat commit_id) &&
+
+	git commit-tree -p $(cat commit_id) -m "Just one" three^{tree} >up &&
+	git branch update $(cat up) &&
+
+	git commit-tree -p $(cat up) -m "Back to weird" two^{tree} >final &&
+	git branch final $(cat final) &&
+
+	rm commit_id up final
+'
+
+test_expect_failure 'git read-tree does not segfault' '
+	test_when_finished rm .git/index.lock &&
+	test_might_fail git read-tree --reset base
+'
+
+test_expect_failure 'reset --hard does not segfault' '
+	test_when_finished rm .git/index.lock &&
+	git checkout base &&
+	test_might_fail git reset --hard
+'
+
+test_expect_failure 'git diff HEAD does not segfault' '
+	git checkout base &&
+	GIT_TEST_CHECK_CACHE_TREE=false &&
+	git reset --hard &&
+	test_might_fail git diff HEAD
+'
+
+test_expect_failure 'can switch to another branch when status is empty' '
+	git clean -ffdqx &&
+	git status --porcelain -uno >actual &&
+	test_must_be_empty actual &&
+	git checkout update
+'
+
+test_expect_success 'forcibly switch to another branch, verify status empty' '
+	git checkout -f update &&
+	git status --porcelain -uno >actual &&
+	test_must_be_empty actual
+'
+
+test_expect_success 'fast-forward from non-duplicate entries to duplicate' '
+	git merge final
+'
+
+test_expect_failure 'clean status, switch branches, status still clean' '
+	git status --porcelain -uno >actual &&
+	test_must_be_empty actual &&
+	git checkout base &&
+	git status --porcelain -uno >actual &&
+	test_must_be_empty actual
+'
+
+test_expect_success 'switch to base branch and force status to be clean' '
+	git checkout base &&
+	GIT_TEST_CHECK_CACHE_TREE=false git reset --hard &&
+	git status --porcelain -uno >actual &&
+	test_must_be_empty actual
+'
+
+test_expect_failure 'fast-forward from duplicate entries to non-duplicate' '
+	git merge update
+'
+
 test_done
diff --git a/t/t4059-diff-submodule-not-initialized.sh b/t/t4059-diff-submodule-not-initialized.sh
index 49bca7b..d489230 100755
--- a/t/t4059-diff-submodule-not-initialized.sh
+++ b/t/t4059-diff-submodule-not-initialized.sh
@@ -49,7 +49,7 @@ test_expect_success 'setup - submodules' '
 '
 
 test_expect_success 'setup - git submodule add' '
-	git submodule add ./sm2 sm1 &&
+	git -c protocol.file.allow=always submodule add ./sm2 sm1 &&
 	commit_file sm1 .gitmodules &&
 	git diff-tree -p --no-commit-id --submodule=log HEAD -- sm1 >actual &&
 	cat >expected <<-EOF &&
diff --git a/t/t4060-diff-submodule-option-diff-format.sh b/t/t4060-diff-submodule-option-diff-format.sh
index fc8229c..97c6424 100755
--- a/t/t4060-diff-submodule-option-diff-format.sh
+++ b/t/t4060-diff-submodule-option-diff-format.sh
@@ -361,7 +361,6 @@ test_expect_success 'typechanged submodule(submodule->blob)' '
 rm -f sm1 &&
 test_create_repo sm1 &&
 head6=$(add_file sm1 foo6 foo7)
-fullhead6=$(cd sm1; git rev-parse --verify HEAD)
 test_expect_success 'nonexistent commit' '
 	git diff-index -p --submodule=diff HEAD >actual &&
 	cat >expected <<-EOF &&
@@ -409,7 +408,7 @@ test_expect_success 'submodule is up to date' '
 
 test_expect_success 'submodule contains untracked content' '
 	echo new > sm1/new-file &&
-	git diff-index -p --submodule=diff HEAD >actual &&
+	git diff-index -p --ignore-submodules=none --submodule=diff HEAD >actual &&
 	cat >expected <<-EOF &&
 	Submodule sm1 contains untracked content
 	EOF
@@ -417,7 +416,7 @@ test_expect_success 'submodule contains untracked content' '
 '
 
 test_expect_success 'submodule contains untracked content (untracked ignored)' '
-	git diff-index -p --ignore-submodules=untracked --submodule=diff HEAD >actual &&
+	git diff-index -p --submodule=diff HEAD >actual &&
 	test_must_be_empty actual
 '
 
@@ -433,7 +432,7 @@ test_expect_success 'submodule contains untracked content (all ignored)' '
 
 test_expect_success 'submodule contains untracked and modified content' '
 	echo new > sm1/foo6 &&
-	git diff-index -p --submodule=diff HEAD >actual &&
+	git diff-index -p --ignore-submodules=none --submodule=diff HEAD >actual &&
 	cat >expected <<-EOF &&
 	Submodule sm1 contains untracked content
 	Submodule sm1 contains modified content
@@ -451,7 +450,7 @@ test_expect_success 'submodule contains untracked and modified content' '
 # NOT OK
 test_expect_success 'submodule contains untracked and modified content (untracked ignored)' '
 	echo new > sm1/foo6 &&
-	git diff-index -p --ignore-submodules=untracked --submodule=diff HEAD >actual &&
+	git diff-index -p --submodule=diff HEAD >actual &&
 	cat >expected <<-EOF &&
 	Submodule sm1 contains modified content
 	diff --git a/sm1/foo6 b/sm1/foo6
@@ -512,7 +511,7 @@ test_expect_success 'submodule is modified' '
 
 test_expect_success 'modified submodule contains untracked content' '
 	echo new > sm1/new-file &&
-	git diff-index -p --submodule=diff HEAD >actual &&
+	git diff-index -p --ignore-submodules=none --submodule=diff HEAD >actual &&
 	cat >expected <<-EOF &&
 	Submodule sm1 contains untracked content
 	Submodule sm1 $head7..$head8:
@@ -528,7 +527,7 @@ test_expect_success 'modified submodule contains untracked content' '
 '
 
 test_expect_success 'modified submodule contains untracked content (untracked ignored)' '
-	git diff-index -p --ignore-submodules=untracked --submodule=diff HEAD >actual &&
+	git diff-index -p --submodule=diff HEAD >actual &&
 	cat >expected <<-EOF &&
 	Submodule sm1 $head7..$head8:
 	diff --git a/sm1/foo6 b/sm1/foo6
@@ -564,7 +563,7 @@ test_expect_success 'modified submodule contains untracked content (all ignored)
 
 test_expect_success 'modified submodule contains untracked and modified content' '
 	echo modification >> sm1/foo6 &&
-	git diff-index -p --submodule=diff HEAD >actual &&
+	git diff-index -p --ignore-submodules=none --submodule=diff HEAD >actual &&
 	cat >expected <<-EOF &&
 	Submodule sm1 contains untracked content
 	Submodule sm1 contains modified content
@@ -583,7 +582,7 @@ test_expect_success 'modified submodule contains untracked and modified content'
 
 test_expect_success 'modified submodule contains untracked and modified content (untracked ignored)' '
 	echo modification >> sm1/foo6 &&
-	git diff-index -p --ignore-submodules=untracked --submodule=diff HEAD >actual &&
+	git diff-index -p --submodule=diff HEAD >actual &&
 	cat >expected <<-EOF &&
 	Submodule sm1 contains modified content
 	Submodule sm1 $head7..$head8:
@@ -704,10 +703,26 @@ test_expect_success 'path filter' '
 	diff_cmp expected actual
 '
 
-commit_file sm2
+cat >.gitmodules <<-EOF
+[submodule "sm2"]
+	path = sm2
+	url = bogus_url
+EOF
+git add .gitmodules
+commit_file sm2 .gitmodules
+
 test_expect_success 'given commit' '
 	git diff-index -p --submodule=diff HEAD^ >actual &&
 	cat >expected <<-EOF &&
+	diff --git a/.gitmodules b/.gitmodules
+	new file mode 100644
+	index 1234567..89abcde
+	--- /dev/null
+	+++ b/.gitmodules
+	@@ -0,0 +1,3 @@
+	+[submodule "sm2"]
+	+path = sm2
+	+url = bogus_url
 	Submodule sm1 $head7...0000000 (submodule deleted)
 	Submodule sm2 0000000...$head9 (new submodule)
 	diff --git a/sm2/foo8 b/sm2/foo8
@@ -729,15 +744,21 @@ test_expect_success 'given commit' '
 '
 
 test_expect_success 'setup .git file for sm2' '
-	(cd sm2 &&
-	 REAL="$(pwd)/../.real" &&
-	 mv .git "$REAL" &&
-	 echo "gitdir: $REAL" >.git)
+	git submodule absorbgitdirs sm2
 '
 
 test_expect_success 'diff --submodule=diff with .git file' '
 	git diff --submodule=diff HEAD^ >actual &&
 	cat >expected <<-EOF &&
+	diff --git a/.gitmodules b/.gitmodules
+	new file mode 100644
+	index 1234567..89abcde
+	--- /dev/null
+	+++ b/.gitmodules
+	@@ -0,0 +1,3 @@
+	+[submodule "sm2"]
+	+path = sm2
+	+url = bogus_url
 	Submodule sm1 $head7...0000000 (submodule deleted)
 	Submodule sm2 0000000...$head9 (new submodule)
 	diff --git a/sm2/foo8 b/sm2/foo8
@@ -758,10 +779,68 @@ test_expect_success 'diff --submodule=diff with .git file' '
 	diff_cmp expected actual
 '
 
+mv sm2 sm2-bak
+
+test_expect_success 'deleted submodule with .git file' '
+	git diff-index -p --submodule=diff HEAD >actual &&
+	cat >expected <<-EOF &&
+	Submodule sm1 $head7...0000000 (submodule deleted)
+	Submodule sm2 $head9...0000000 (submodule deleted)
+	diff --git a/sm2/foo8 b/sm2/foo8
+	deleted file mode 100644
+	index 1234567..89abcde
+	--- a/sm2/foo8
+	+++ /dev/null
+	@@ -1 +0,0 @@
+	-foo8
+	diff --git a/sm2/foo9 b/sm2/foo9
+	deleted file mode 100644
+	index 1234567..89abcde
+	--- a/sm2/foo9
+	+++ /dev/null
+	@@ -1 +0,0 @@
+	-foo9
+	EOF
+	diff_cmp expected actual
+'
+
+echo submodule-to-blob>sm2
+
+test_expect_success 'typechanged(submodule->blob) submodule with .git file' '
+	git diff-index -p --submodule=diff HEAD >actual &&
+	cat >expected <<-EOF &&
+	Submodule sm1 $head7...0000000 (submodule deleted)
+	Submodule sm2 $head9...0000000 (submodule deleted)
+	diff --git a/sm2/foo8 b/sm2/foo8
+	deleted file mode 100644
+	index 1234567..89abcde
+	--- a/sm2/foo8
+	+++ /dev/null
+	@@ -1 +0,0 @@
+	-foo8
+	diff --git a/sm2/foo9 b/sm2/foo9
+	deleted file mode 100644
+	index 1234567..89abcde
+	--- a/sm2/foo9
+	+++ /dev/null
+	@@ -1 +0,0 @@
+	-foo9
+	diff --git a/sm2 b/sm2
+	new file mode 100644
+	index 1234567..89abcde
+	--- /dev/null
+	+++ b/sm2
+	@@ -0,0 +1 @@
+	+submodule-to-blob
+	EOF
+	diff_cmp expected actual
+'
+
+rm sm2
+mv sm2-bak sm2
+
 test_expect_success 'setup nested submodule' '
-	git submodule add -f ./sm2 &&
-	git commit -a -m "add sm2" &&
-	git -C sm2 submodule add ../sm2 nested &&
+	git -c protocol.file.allow=always -C sm2 submodule add ../sm2 nested &&
 	git -C sm2 commit -a -m "nested sub" &&
 	head10=$(git -C sm2 rev-parse --short --verify HEAD)
 '
@@ -791,6 +870,7 @@ test_expect_success 'diff --submodule=diff with moved nested submodule HEAD' '
 
 test_expect_success 'diff --submodule=diff recurses into nested submodules' '
 	cat >expected <<-EOF &&
+	Submodule sm1 $head7...0000000 (submodule deleted)
 	Submodule sm2 contains modified content
 	Submodule sm2 $head9..$head10:
 	diff --git a/sm2/.gitmodules b/sm2/.gitmodules
@@ -830,4 +910,67 @@ test_expect_success 'diff --submodule=diff recurses into nested submodules' '
 	diff_cmp expected actual
 '
 
+(cd sm2; commit_file nested)
+commit_file sm2
+head12=$(cd sm2; git rev-parse --short --verify HEAD)
+
+mv sm2 sm2-bak
+
+test_expect_success 'diff --submodule=diff recurses into deleted nested submodules' '
+	cat >expected <<-EOF &&
+	Submodule sm1 $head7...0000000 (submodule deleted)
+	Submodule sm2 $head12...0000000 (submodule deleted)
+	diff --git a/sm2/.gitmodules b/sm2/.gitmodules
+	deleted file mode 100644
+	index 3a816b8..0000000
+	--- a/sm2/.gitmodules
+	+++ /dev/null
+	@@ -1,3 +0,0 @@
+	-[submodule "nested"]
+	-	path = nested
+	-	url = ../sm2
+	diff --git a/sm2/foo8 b/sm2/foo8
+	deleted file mode 100644
+	index db9916b..0000000
+	--- a/sm2/foo8
+	+++ /dev/null
+	@@ -1 +0,0 @@
+	-foo8
+	diff --git a/sm2/foo9 b/sm2/foo9
+	deleted file mode 100644
+	index 9c3b4f6..0000000
+	--- a/sm2/foo9
+	+++ /dev/null
+	@@ -1 +0,0 @@
+	-foo9
+	Submodule nested $head11...0000000 (submodule deleted)
+	diff --git a/sm2/nested/file b/sm2/nested/file
+	deleted file mode 100644
+	index ca281f5..0000000
+	--- a/sm2/nested/file
+	+++ /dev/null
+	@@ -1 +0,0 @@
+	-nested content
+	diff --git a/sm2/nested/foo8 b/sm2/nested/foo8
+	deleted file mode 100644
+	index db9916b..0000000
+	--- a/sm2/nested/foo8
+	+++ /dev/null
+	@@ -1 +0,0 @@
+	-foo8
+	diff --git a/sm2/nested/foo9 b/sm2/nested/foo9
+	deleted file mode 100644
+	index 9c3b4f6..0000000
+	--- a/sm2/nested/foo9
+	+++ /dev/null
+	@@ -1 +0,0 @@
+	-foo9
+	EOF
+	git diff --submodule=diff >actual 2>err &&
+	test_must_be_empty err &&
+	diff_cmp expected actual
+'
+
+mv sm2-bak sm2
+
 test_done
diff --git a/t/t4061-diff-indent.sh b/t/t4061-diff-indent.sh
index 0f7a6d9..7750b87 100755
--- a/t/t4061-diff-indent.sh
+++ b/t/t4061-diff-indent.sh
@@ -3,8 +3,11 @@
 test_description='Test diff indent heuristic.
 
 '
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
-. "$TEST_DIRECTORY"/diff-lib.sh
+. "$TEST_DIRECTORY"/lib-diff.sh
 
 # Compare two diff outputs. Ignore "index" lines, because we don't
 # care about SHA-1s or file modes.
@@ -266,7 +269,7 @@ test_expect_success 'diff-index: nice spaces with --indent-heuristic' '
 	git reset --soft HEAD~ &&
 	git diff-index --indent-heuristic -p old -- spaces.txt >out-diff-index-compacted &&
 	compare_diff spaces-compacted-expect out-diff-index-compacted &&
-	git checkout -f master
+	git checkout -f main
 '
 
 test_expect_success 'diff-index: nice spaces with diff.indentHeuristic=true' '
@@ -274,7 +277,7 @@ test_expect_success 'diff-index: nice spaces with diff.indentHeuristic=true' '
 	git reset --soft HEAD~ &&
 	git -c diff.indentHeuristic=true diff-index -p old -- spaces.txt >out-diff-index-compacted2 &&
 	compare_diff spaces-compacted-expect out-diff-index-compacted2 &&
-	git checkout -f master
+	git checkout -f main
 '
 
 test_expect_success 'diff-index: ugly spaces with --no-indent-heuristic' '
@@ -282,7 +285,7 @@ test_expect_success 'diff-index: ugly spaces with --no-indent-heuristic' '
 	git reset --soft HEAD~ &&
 	git diff-index --no-indent-heuristic -p old -- spaces.txt >out-diff-index &&
 	compare_diff spaces-expect out-diff-index &&
-	git checkout -f master
+	git checkout -f main
 '
 
 test_expect_success 'diff-index: ugly spaces with diff.indentHeuristic=false' '
@@ -290,7 +293,7 @@ test_expect_success 'diff-index: ugly spaces with diff.indentHeuristic=false' '
 	git reset --soft HEAD~ &&
 	git -c diff.indentHeuristic=false diff-index -p old -- spaces.txt >out-diff-index2 &&
 	compare_diff spaces-expect out-diff-index2 &&
-	git checkout -f master
+	git checkout -f main
 '
 
 test_expect_success 'diff-index: --indent-heuristic overrides config' '
@@ -298,7 +301,7 @@ test_expect_success 'diff-index: --indent-heuristic overrides config' '
 	git reset --soft HEAD~ &&
 	git -c diff.indentHeuristic=false diff-index --indent-heuristic -p old -- spaces.txt >out-diff-index-compacted3 &&
 	compare_diff spaces-compacted-expect out-diff-index-compacted3 &&
-	git checkout -f master
+	git checkout -f main
 '
 
 test_expect_success 'diff-index: --no-indent-heuristic overrides config' '
@@ -306,7 +309,7 @@ test_expect_success 'diff-index: --no-indent-heuristic overrides config' '
 	git reset --soft HEAD~ &&
 	git -c diff.indentHeuristic=true diff-index --no-indent-heuristic -p old -- spaces.txt >out-diff-index3 &&
 	compare_diff spaces-expect out-diff-index3 &&
-	git checkout -f master
+	git checkout -f main
 '
 
 # --- diff-files tests ----------------------------------------------------
@@ -317,7 +320,7 @@ test_expect_success 'diff-files: nice spaces with --indent-heuristic' '
 	git diff-files --indent-heuristic -p spaces.txt >out-diff-files-raw &&
 	grep -v index out-diff-files-raw >out-diff-files-compacted &&
 	compare_diff spaces-compacted-expect out-diff-files-compacted &&
-	git checkout -f master
+	git checkout -f main
 '
 
 test_expect_success 'diff-files: nice spaces with diff.indentHeuristic=true' '
@@ -326,7 +329,7 @@ test_expect_success 'diff-files: nice spaces with diff.indentHeuristic=true' '
 	git -c diff.indentHeuristic=true diff-files -p spaces.txt >out-diff-files-raw2 &&
 	grep -v index out-diff-files-raw2 >out-diff-files-compacted2 &&
 	compare_diff spaces-compacted-expect out-diff-files-compacted2 &&
-	git checkout -f master
+	git checkout -f main
 '
 
 test_expect_success 'diff-files: ugly spaces with --no-indent-heuristic' '
@@ -335,7 +338,7 @@ test_expect_success 'diff-files: ugly spaces with --no-indent-heuristic' '
 	git diff-files --no-indent-heuristic -p spaces.txt >out-diff-files-raw &&
 	grep -v index out-diff-files-raw >out-diff-files &&
 	compare_diff spaces-expect out-diff-files &&
-	git checkout -f master
+	git checkout -f main
 '
 
 test_expect_success 'diff-files: ugly spaces with diff.indentHeuristic=false' '
@@ -344,7 +347,7 @@ test_expect_success 'diff-files: ugly spaces with diff.indentHeuristic=false' '
 	git -c diff.indentHeuristic=false diff-files -p spaces.txt >out-diff-files-raw2 &&
 	grep -v index out-diff-files-raw2 >out-diff-files &&
 	compare_diff spaces-expect out-diff-files &&
-	git checkout -f master
+	git checkout -f main
 '
 
 test_expect_success 'diff-files: --indent-heuristic overrides config' '
@@ -353,7 +356,7 @@ test_expect_success 'diff-files: --indent-heuristic overrides config' '
 	git -c diff.indentHeuristic=false diff-files --indent-heuristic -p spaces.txt >out-diff-files-raw3 &&
 	grep -v index out-diff-files-raw3 >out-diff-files-compacted &&
 	compare_diff spaces-compacted-expect out-diff-files-compacted &&
-	git checkout -f master
+	git checkout -f main
 '
 
 test_expect_success 'diff-files: --no-indent-heuristic overrides config' '
@@ -362,7 +365,7 @@ test_expect_success 'diff-files: --no-indent-heuristic overrides config' '
 	git -c diff.indentHeuristic=true diff-files --no-indent-heuristic -p spaces.txt >out-diff-files-raw4 &&
 	grep -v index out-diff-files-raw4 >out-diff-files &&
 	compare_diff spaces-expect out-diff-files &&
-	git checkout -f master
+	git checkout -f main
 '
 
 test_done
diff --git a/t/t4062-diff-pickaxe.sh b/t/t4062-diff-pickaxe.sh
index 1130c80..a90b46b 100755
--- a/t/t4062-diff-pickaxe.sh
+++ b/t/t4062-diff-pickaxe.sh
@@ -5,6 +5,7 @@
 
 test_description='Pickaxe options'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -23,7 +24,7 @@ test_expect_success '-G matches' '
 
 test_expect_success '-S --pickaxe-regex' '
 	git diff --name-only -S0 --pickaxe-regex HEAD^ >out &&
-	verbose test 4096-zeroes.txt = "$(cat out)"
+	test 4096-zeroes.txt = "$(cat out)"
 '
 
 test_done
diff --git a/t/t4063-diff-blobs.sh b/t/t4063-diff-blobs.sh
index bc69e26..7e6c9d6 100755
--- a/t/t4063-diff-blobs.sh
+++ b/t/t4063-diff-blobs.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='test direct comparison of blobs via git-diff'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 run_diff () {
diff --git a/t/t4064-diff-oidfind.sh b/t/t4064-diff-oidfind.sh
index 3bdf317..6d8c898 100755
--- a/t/t4064-diff-oidfind.sh
+++ b/t/t4064-diff-oidfind.sh
@@ -65,4 +65,59 @@ test_expect_success 'find a submodule' '
 	test_cmp expect actual
 '
 
+test_expect_success 'set up merge tests' '
+	test_commit base &&
+
+	git checkout -b boring base^ &&
+	echo boring >file &&
+	git add file &&
+	git commit -m boring &&
+
+	git checkout -b interesting base^ &&
+	echo interesting >file &&
+	git add file &&
+	git commit -m interesting &&
+
+	blob=$(git rev-parse interesting:file)
+'
+
+test_expect_success 'detect merge which introduces blob' '
+	git checkout -B merge base &&
+	git merge --no-commit boring &&
+	echo interesting >file &&
+	git commit -am "introduce blob" &&
+	git diff-tree --format=%s --find-object=$blob -c --name-status HEAD >actual &&
+	cat >expect <<-\EOF &&
+	introduce blob
+
+	AM	file
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'detect merge which removes blob' '
+	git checkout -B merge interesting &&
+	git merge --no-commit base &&
+	echo boring >file &&
+	git commit -am "remove blob" &&
+	git diff-tree --format=%s --find-object=$blob -c --name-status HEAD >actual &&
+	cat >expect <<-\EOF &&
+	remove blob
+
+	MA	file
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'do not detect merge that does not touch blob' '
+	git checkout -B merge interesting &&
+	git merge -m "untouched blob" base &&
+	git diff-tree --format=%s --find-object=$blob -c --name-status HEAD >actual &&
+	cat >expect <<-\EOF &&
+	untouched blob
+
+	EOF
+	test_cmp expect actual
+'
+
 test_done
diff --git a/t/t4066-diff-emit-delay.sh b/t/t4066-diff-emit-delay.sh
index 6331f63..0ecb391 100755
--- a/t/t4066-diff-emit-delay.sh
+++ b/t/t4066-diff-emit-delay.sh
@@ -1,6 +1,10 @@
 #!/bin/sh
 
 test_description='test combined/stat/moved interaction'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # This test covers a weird 3-way interaction between "--cc -p", which will run
@@ -13,7 +17,7 @@ test_expect_success 'set up history with a merge' '
 	test_commit B &&
 	git checkout -b side HEAD^ &&
 	test_commit C &&
-	git merge -m M master &&
+	git merge -m M main &&
 	test_commit D
 '
 
diff --git a/t/t4067-diff-partial-clone.sh b/t/t4067-diff-partial-clone.sh
index ef8e0e9..7af3a08 100755
--- a/t/t4067-diff-partial-clone.sh
+++ b/t/t4067-diff-partial-clone.sh
@@ -2,6 +2,7 @@
 
 test_description='behavior of diff when reading objects in a partial clone'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'git show batches blobs' '
@@ -20,7 +21,7 @@ test_expect_success 'git show batches blobs' '
 	# Ensure that there is exactly 1 negotiation by checking that there is
 	# only 1 "done" line sent. ("done" marks the end of negotiation.)
 	GIT_TRACE_PACKET="$(pwd)/trace" git -C client show HEAD &&
-	grep "git> done" trace >done_lines &&
+	grep "fetch> done" trace >done_lines &&
 	test_line_count = 1 done_lines
 '
 
@@ -44,7 +45,7 @@ test_expect_success 'diff batches blobs' '
 	# Ensure that there is exactly 1 negotiation by checking that there is
 	# only 1 "done" line sent. ("done" marks the end of negotiation.)
 	GIT_TRACE_PACKET="$(pwd)/trace" git -C client diff HEAD^ HEAD &&
-	grep "git> done" trace >done_lines &&
+	grep "fetch> done" trace >done_lines &&
 	test_line_count = 1 done_lines
 '
 
@@ -77,6 +78,7 @@ test_expect_success 'diff skips same-OID blobs' '
 
 test_expect_success 'when fetching missing objects, diff skips GITLINKs' '
 	test_when_finished "rm -rf sub server client trace" &&
+	test_config_global protocol.file.allow always &&
 
 	test_create_repo sub &&
 	test_commit -C sub first &&
@@ -127,7 +129,7 @@ test_expect_success 'diff with rename detection batches blobs' '
 	# only 1 "done" line sent. ("done" marks the end of negotiation.)
 	GIT_TRACE_PACKET="$(pwd)/trace" git -C client diff --raw -M HEAD^ HEAD >out &&
 	grep ":100644 100644.*R[0-9][0-9][0-9].*b.*c" out &&
-	grep "git> done" trace >done_lines &&
+	grep "fetch> done" trace >done_lines &&
 	test_line_count = 1 done_lines
 '
 
@@ -149,7 +151,7 @@ test_expect_success 'diff does not fetch anything if inexact rename detection is
 
 	# Ensure no fetches.
 	GIT_TRACE_PACKET="$(pwd)/trace" git -C client diff --raw -M HEAD^ HEAD &&
-	! test_path_exists trace
+	test_path_is_missing trace
 '
 
 test_expect_success 'diff --break-rewrites fetches only if necessary, and batches blobs if it does' '
@@ -169,13 +171,13 @@ test_expect_success 'diff --break-rewrites fetches only if necessary, and batche
 
 	# Ensure no fetches.
 	GIT_TRACE_PACKET="$(pwd)/trace" git -C client diff --raw -M HEAD^ HEAD &&
-	! test_path_exists trace &&
+	test_path_is_missing trace &&
 
 	# But with --break-rewrites, ensure that there is exactly 1 negotiation
 	# by checking that there is only 1 "done" line sent. ("done" marks the
 	# end of negotiation.)
 	GIT_TRACE_PACKET="$(pwd)/trace" git -C client diff --break-rewrites --raw -M HEAD^ HEAD &&
-	grep "git> done" trace >done_lines &&
+	grep "fetch> done" trace >done_lines &&
 	test_line_count = 1 done_lines
 '
 
diff --git a/t/t4068-diff-symmetric-merge-base.sh b/t/t4068-diff-symmetric-merge-base.sh
new file mode 100755
index 0000000..eff63c1
--- /dev/null
+++ b/t/t4068-diff-symmetric-merge-base.sh
@@ -0,0 +1,203 @@
+#!/bin/sh
+
+test_description='behavior of diff with symmetric-diff setups and --merge-base'
+
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+. ./test-lib.sh
+
+# build these situations:
+#  - normal merge with one merge base (br1...b2r);
+#  - criss-cross merge ie 2 merge bases (br1...main);
+#  - disjoint subgraph (orphan branch, br3...main).
+#
+#     B---E   <-- main
+#    / \ /
+#   A   X
+#    \ / \
+#     C---D--G   <-- br1
+#      \    /
+#       ---F   <-- br2
+#
+#  H  <-- br3
+#
+# We put files into a few commits so that we can verify the
+# output as well.
+
+test_expect_success setup '
+	git commit --allow-empty -m A &&
+	echo b >b &&
+	git add b &&
+	git commit -m B &&
+	git checkout -b br1 HEAD^ &&
+	echo c >c &&
+	git add c &&
+	git commit -m C &&
+	git tag -m commit-C commit-C &&
+	git merge -m D main &&
+	git tag commit-D &&
+	git checkout main &&
+	git merge -m E commit-C &&
+	git checkout -b br2 commit-C &&
+	echo f >f &&
+	git add f &&
+	git commit -m F &&
+	git checkout br1 &&
+	git merge -m G br2 &&
+	git checkout --orphan br3 &&
+	git commit -m H
+'
+
+test_expect_success 'diff with one merge base' '
+	git diff commit-D...br1 >tmp &&
+	tail -n 1 tmp >actual &&
+	echo +f >expect &&
+	test_cmp expect actual
+'
+
+# The output (in tmp) can have +b or +c depending
+# on which merge base (commit B or C) is picked.
+# It should have one of those two, which comes out
+# to seven lines.
+test_expect_success 'diff with two merge bases' '
+	git diff br1...main >tmp 2>err &&
+	test_line_count = 7 tmp &&
+	test_line_count = 1 err
+'
+
+test_expect_success 'diff with no merge bases' '
+	test_must_fail git diff br2...br3 2>err &&
+	test_grep "fatal: br2...br3: no merge base" err
+'
+
+test_expect_success 'diff with too many symmetric differences' '
+	test_must_fail git diff br1...main br2...br3 2>err &&
+	test_grep "usage" err
+'
+
+test_expect_success 'diff with symmetric difference and extraneous arg' '
+	test_must_fail git diff main br1...main 2>err &&
+	test_grep "usage" err
+'
+
+test_expect_success 'diff with two ranges' '
+	test_must_fail git diff main br1..main br2..br3 2>err &&
+	test_grep "usage" err
+'
+
+test_expect_success 'diff with ranges and extra arg' '
+	test_must_fail git diff main br1..main commit-D 2>err &&
+	test_grep "usage" err
+'
+
+test_expect_success 'diff --merge-base with no commits' '
+	test_must_fail git diff --merge-base
+'
+
+test_expect_success 'diff --merge-base with three commits' '
+	test_must_fail git diff --merge-base br1 br2 main 2>err &&
+	test_grep "usage" err
+'
+
+for cmd in diff-index diff
+do
+	test_expect_success "$cmd --merge-base with one commit" '
+		git checkout main &&
+		git $cmd commit-C >expect &&
+		git $cmd --merge-base br2 >actual &&
+		test_cmp expect actual
+	'
+
+	test_expect_success "$cmd --merge-base with annotated tag" '
+		git checkout main &&
+		git $cmd commit-C >expect &&
+		git $cmd --merge-base commit-C >actual &&
+		test_cmp expect actual
+	'
+
+	test_expect_success "$cmd --merge-base with one commit and unstaged changes" '
+		git checkout main &&
+		test_when_finished git reset --hard &&
+		echo unstaged >>c &&
+		git $cmd commit-C >expect &&
+		git $cmd --merge-base br2 >actual &&
+		test_cmp expect actual
+	'
+
+	test_expect_success "$cmd --merge-base with one commit and staged and unstaged changes" '
+		git checkout main &&
+		test_when_finished git reset --hard &&
+		echo staged >>c &&
+		git add c &&
+		echo unstaged >>c &&
+		git $cmd commit-C >expect &&
+		git $cmd --merge-base br2 >actual &&
+		test_cmp expect actual
+	'
+
+	test_expect_success "$cmd --merge-base --cached with one commit and staged and unstaged changes" '
+		git checkout main &&
+		test_when_finished git reset --hard &&
+		echo staged >>c &&
+		git add c &&
+		echo unstaged >>c &&
+		git $cmd --cached commit-C >expect &&
+		git $cmd --cached --merge-base br2 >actual &&
+		test_cmp expect actual
+	'
+
+	test_expect_success "$cmd --merge-base with non-commit" '
+		git checkout main &&
+		test_must_fail git $cmd --merge-base main^{tree} 2>err &&
+		test_grep "is a tree, not a commit" err
+	'
+
+	test_expect_success "$cmd --merge-base with no merge bases and one commit" '
+		git checkout main &&
+		test_must_fail git $cmd --merge-base br3 2>err &&
+		test_grep "fatal: no merge base found" err
+	'
+
+	test_expect_success "$cmd --merge-base with multiple merge bases and one commit" '
+		git checkout main &&
+		test_must_fail git $cmd --merge-base br1 2>err &&
+		test_grep "fatal: multiple merge bases found" err
+	'
+done
+
+for cmd in diff-tree diff
+do
+	test_expect_success "$cmd --merge-base with two commits" '
+		git $cmd commit-C main >expect &&
+		git $cmd --merge-base br2 main >actual &&
+		test_cmp expect actual
+	'
+
+	test_expect_success "$cmd --merge-base commit and non-commit" '
+		test_must_fail git $cmd --merge-base br2 main^{tree} 2>err &&
+		test_grep "is a tree, not a commit" err
+	'
+
+	test_expect_success "$cmd --merge-base with no merge bases and two commits" '
+		test_must_fail git $cmd --merge-base br2 br3 2>err &&
+		test_grep "fatal: no merge base found" err
+	'
+
+	test_expect_success "$cmd --merge-base with multiple merge bases and two commits" '
+		test_must_fail git $cmd --merge-base main br1 2>err &&
+		test_grep "fatal: multiple merge bases found" err
+	'
+done
+
+test_expect_success 'diff-tree --merge-base with one commit' '
+	test_must_fail git diff-tree --merge-base main 2>err &&
+	test_grep "fatal: --merge-base only works with two commits" err
+'
+
+test_expect_success 'diff --merge-base with range' '
+	test_must_fail git diff --merge-base br2..br3 2>err &&
+	test_grep "fatal: --merge-base does not work with ranges" err
+'
+
+test_done
diff --git a/t/t4068-diff-symmetric.sh b/t/t4068-diff-symmetric.sh
deleted file mode 100755
index 31d17a5..0000000
--- a/t/t4068-diff-symmetric.sh
+++ /dev/null
@@ -1,91 +0,0 @@
-#!/bin/sh
-
-test_description='behavior of diff with symmetric-diff setups'
-
-. ./test-lib.sh
-
-# build these situations:
-#  - normal merge with one merge base (br1...b2r);
-#  - criss-cross merge ie 2 merge bases (br1...master);
-#  - disjoint subgraph (orphan branch, br3...master).
-#
-#     B---E   <-- master
-#    / \ /
-#   A   X
-#    \ / \
-#     C---D--G   <-- br1
-#      \    /
-#       ---F   <-- br2
-#
-#  H  <-- br3
-#
-# We put files into a few commits so that we can verify the
-# output as well.
-
-test_expect_success setup '
-	git commit --allow-empty -m A &&
-	echo b >b &&
-	git add b &&
-	git commit -m B &&
-	git checkout -b br1 HEAD^ &&
-	echo c >c &&
-	git add c &&
-	git commit -m C &&
-	git tag commit-C &&
-	git merge -m D master &&
-	git tag commit-D &&
-	git checkout master &&
-	git merge -m E commit-C &&
-	git checkout -b br2 commit-C &&
-	echo f >f &&
-	git add f &&
-	git commit -m F &&
-	git checkout br1 &&
-	git merge -m G br2 &&
-	git checkout --orphan br3 &&
-	git commit -m H
-'
-
-test_expect_success 'diff with one merge base' '
-	git diff commit-D...br1 >tmp &&
-	tail -n 1 tmp >actual &&
-	echo +f >expect &&
-	test_cmp expect actual
-'
-
-# The output (in tmp) can have +b or +c depending
-# on which merge base (commit B or C) is picked.
-# It should have one of those two, which comes out
-# to seven lines.
-test_expect_success 'diff with two merge bases' '
-	git diff br1...master >tmp 2>err &&
-	test_line_count = 7 tmp &&
-	test_line_count = 1 err
-'
-
-test_expect_success 'diff with no merge bases' '
-	test_must_fail git diff br2...br3 >tmp 2>err &&
-	test_i18ngrep "fatal: br2...br3: no merge base" err
-'
-
-test_expect_success 'diff with too many symmetric differences' '
-	test_must_fail git diff br1...master br2...br3 >tmp 2>err &&
-	test_i18ngrep "usage" err
-'
-
-test_expect_success 'diff with symmetric difference and extraneous arg' '
-	test_must_fail git diff master br1...master >tmp 2>err &&
-	test_i18ngrep "usage" err
-'
-
-test_expect_success 'diff with two ranges' '
-	test_must_fail git diff master br1..master br2..br3 >tmp 2>err &&
-	test_i18ngrep "usage" err
-'
-
-test_expect_success 'diff with ranges and extra arg' '
-	test_must_fail git diff master br1..master commit-D >tmp 2>err &&
-	test_i18ngrep "usage" err
-'
-
-test_done
diff --git a/t/t4069-remerge-diff.sh b/t/t4069-remerge-diff.sh
new file mode 100755
index 0000000..07323eb
--- /dev/null
+++ b/t/t4069-remerge-diff.sh
@@ -0,0 +1,320 @@
+#!/bin/sh
+
+test_description='remerge-diff handling'
+
+. ./test-lib.sh
+
+# This test is ort-specific
+if test "${GIT_TEST_MERGE_ALGORITHM}" != ort
+then
+	skip_all="GIT_TEST_MERGE_ALGORITHM != ort"
+	test_done
+fi
+
+test_expect_success 'setup basic merges' '
+	test_write_lines 1 2 3 4 5 6 7 8 9 >numbers &&
+	git add numbers &&
+	git commit -m base &&
+
+	git branch feature_a &&
+	git branch feature_b &&
+	git branch feature_c &&
+
+	git branch ab_resolution &&
+	git branch bc_resolution &&
+
+	git checkout feature_a &&
+	test_write_lines 1 2 three 4 5 6 7 eight 9 >numbers &&
+	git commit -a -m change_a &&
+
+	git checkout feature_b &&
+	test_write_lines 1 2 tres 4 5 6 7 8 9 >numbers &&
+	git commit -a -m change_b &&
+
+	git checkout feature_c &&
+	test_write_lines 1 2 3 4 5 6 7 8 9 10 >numbers &&
+	git commit -a -m change_c &&
+
+	git checkout bc_resolution &&
+	git merge --ff-only feature_b &&
+	# no conflict
+	git merge feature_c &&
+
+	git checkout ab_resolution &&
+	git merge --ff-only feature_a &&
+	# conflicts!
+	test_must_fail git merge feature_b &&
+	# Resolve conflict...and make another change elsewhere
+	test_write_lines 1 2 drei 4 5 6 7 acht 9 >numbers &&
+	git add numbers &&
+	git merge --continue
+'
+
+test_expect_success 'remerge-diff on a clean merge' '
+	git log -1 --oneline bc_resolution >expect &&
+	git show --oneline --remerge-diff bc_resolution >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'remerge-diff on a clean merge with a filter' '
+	git show --oneline --remerge-diff --diff-filter=U bc_resolution >actual &&
+	test_must_be_empty actual
+'
+
+test_expect_success 'remerge-diff with both a resolved conflict and an unrelated change' '
+	git log -1 --oneline ab_resolution >tmp &&
+	cat <<-EOF >>tmp &&
+	diff --git a/numbers b/numbers
+	remerge CONFLICT (content): Merge conflict in numbers
+	index a1fb731..6875544 100644
+	--- a/numbers
+	+++ b/numbers
+	@@ -1,13 +1,9 @@
+	 1
+	 2
+	-<<<<<<< b0ed5cb (change_a)
+	-three
+	-=======
+	-tres
+	->>>>>>> 6cd3f82 (change_b)
+	+drei
+	 4
+	 5
+	 6
+	 7
+	-eight
+	+acht
+	 9
+	EOF
+	# Hashes above are sha1; rip them out so test works with sha256
+	sed -e "s/[0-9a-f]\{7,\}/HASH/g" tmp >expect &&
+
+	git show --oneline --remerge-diff ab_resolution >tmp &&
+	sed -e "s/[0-9a-f]\{7,\}/HASH/g" tmp >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'pickaxe still includes additional headers for relevant changes' '
+	# reuses "expect" from the previous testcase
+
+	git log --oneline --remerge-diff -Sacht ab_resolution >tmp &&
+	sed -e "s/[0-9a-f]\{7,\}/HASH/g" tmp >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'can filter out additional headers with pickaxe' '
+	git show --remerge-diff --submodule=log --find-object=HEAD ab_resolution >actual &&
+	test_must_be_empty actual &&
+
+	git show --remerge-diff -S"not present" --all >actual &&
+	test_must_be_empty actual
+'
+
+test_expect_success 'setup non-content conflicts' '
+	git switch --orphan base &&
+
+	test_write_lines 1 2 3 4 5 6 7 8 9 >numbers &&
+	test_write_lines a b c d e f g h i >letters &&
+	test_write_lines in the way >content &&
+	git add numbers letters content &&
+	git commit -m base &&
+
+	git branch side1 &&
+	git branch side2 &&
+
+	git checkout side1 &&
+	test_write_lines 1 2 three 4 5 6 7 8 9 >numbers &&
+	git mv letters letters_side1 &&
+	git mv content file_or_directory &&
+	git add numbers &&
+	git commit -m side1 &&
+
+	git checkout side2 &&
+	git rm numbers &&
+	git mv letters letters_side2 &&
+	mkdir file_or_directory &&
+	echo hello >file_or_directory/world &&
+	git add file_or_directory/world &&
+	git commit -m side2 &&
+
+	git checkout -b resolution side1 &&
+	test_must_fail git merge side2 &&
+	test_write_lines 1 2 three 4 5 6 7 8 9 >numbers &&
+	git add numbers &&
+	git add letters_side1 &&
+	git rm letters &&
+	git rm letters_side2 &&
+	git add file_or_directory~HEAD &&
+	git mv file_or_directory~HEAD wanted_content &&
+	git commit -m resolved
+'
+
+test_expect_success 'remerge-diff with non-content conflicts' '
+	git log -1 --oneline resolution >tmp &&
+	cat <<-EOF >>tmp &&
+	diff --git a/file_or_directory~HASH (side1) b/wanted_content
+	similarity index 100%
+	rename from file_or_directory~HASH (side1)
+	rename to wanted_content
+	remerge CONFLICT (file/directory): directory in the way of file_or_directory from HASH (side1); moving it to file_or_directory~HASH (side1) instead.
+	diff --git a/letters b/letters
+	remerge CONFLICT (rename/rename): letters renamed to letters_side1 in HASH (side1) and to letters_side2 in HASH (side2).
+	diff --git a/letters_side2 b/letters_side2
+	deleted file mode 100644
+	index b236ae5..0000000
+	--- a/letters_side2
+	+++ /dev/null
+	@@ -1,9 +0,0 @@
+	-a
+	-b
+	-c
+	-d
+	-e
+	-f
+	-g
+	-h
+	-i
+	diff --git a/numbers b/numbers
+	remerge CONFLICT (modify/delete): numbers deleted in HASH (side2) and modified in HASH (side1).  Version HASH (side1) of numbers left in tree.
+	EOF
+	# We still have some sha1 hashes above; rip them out so test works
+	# with sha256
+	sed -e "s/[0-9a-f]\{7,\}/HASH/g" tmp >expect &&
+
+	git show --oneline --remerge-diff resolution >tmp &&
+	sed -e "s/[0-9a-f]\{7,\}/HASH/g" tmp >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'remerge-diff w/ diff-filter=U: all conflict headers, no diff content' '
+	git log -1 --oneline resolution >tmp &&
+	cat <<-EOF >>tmp &&
+	diff --git a/file_or_directory~HASH (side1) b/file_or_directory~HASH (side1)
+	remerge CONFLICT (file/directory): directory in the way of file_or_directory from HASH (side1); moving it to file_or_directory~HASH (side1) instead.
+	diff --git a/letters b/letters
+	remerge CONFLICT (rename/rename): letters renamed to letters_side1 in HASH (side1) and to letters_side2 in HASH (side2).
+	diff --git a/numbers b/numbers
+	remerge CONFLICT (modify/delete): numbers deleted in HASH (side2) and modified in HASH (side1).  Version HASH (side1) of numbers left in tree.
+	EOF
+	# We still have some sha1 hashes above; rip them out so test works
+	# with sha256
+	sed -e "s/[0-9a-f]\{7,\}/HASH/g" tmp >expect &&
+
+	git show --oneline --remerge-diff --diff-filter=U resolution >tmp &&
+	sed -e "s/[0-9a-f]\{7,\}/HASH/g" tmp >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'submodule formatting ignores additional headers' '
+	# Reuses "expect" from last testcase
+
+	git show --oneline --remerge-diff --diff-filter=U --submodule=log >tmp &&
+	sed -e "s/[0-9a-f]\{7,\}/HASH/g" tmp >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'remerge-diff w/ diff-filter=R: relevant file + conflict header' '
+	git log -1 --oneline resolution >tmp &&
+	cat <<-EOF >>tmp &&
+	diff --git a/file_or_directory~HASH (side1) b/wanted_content
+	similarity index 100%
+	rename from file_or_directory~HASH (side1)
+	rename to wanted_content
+	remerge CONFLICT (file/directory): directory in the way of file_or_directory from HASH (side1); moving it to file_or_directory~HASH (side1) instead.
+	EOF
+	# We still have some sha1 hashes above; rip them out so test works
+	# with sha256
+	sed -e "s/[0-9a-f]\{7,\}/HASH/g" tmp >expect &&
+
+	git show --oneline --remerge-diff --diff-filter=R resolution >tmp &&
+	sed -e "s/[0-9a-f]\{7,\}/HASH/g" tmp >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'remerge-diff w/ pathspec: limits to relevant file including conflict header' '
+	git log -1 --oneline resolution >tmp &&
+	cat <<-EOF >>tmp &&
+	diff --git a/letters b/letters
+	remerge CONFLICT (rename/rename): letters renamed to letters_side1 in HASH (side1) and to letters_side2 in HASH (side2).
+	diff --git a/letters_side2 b/letters_side2
+	deleted file mode 100644
+	index b236ae5..0000000
+	--- a/letters_side2
+	+++ /dev/null
+	@@ -1,9 +0,0 @@
+	-a
+	-b
+	-c
+	-d
+	-e
+	-f
+	-g
+	-h
+	-i
+	EOF
+	# We still have some sha1 hashes above; rip them out so test works
+	# with sha256
+	sed -e "s/[0-9a-f]\{7,\}/HASH/g" tmp >expect &&
+
+	git show --oneline --remerge-diff resolution -- "letters*" >tmp &&
+	sed -e "s/[0-9a-f]\{7,\}/HASH/g" tmp >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'setup non-content conflicts' '
+	git switch --orphan newbase &&
+
+	test_write_lines 1 2 3 4 5 6 7 8 9 >numbers &&
+	git add numbers &&
+	git commit -m base &&
+
+	git branch newside1 &&
+	git branch newside2 &&
+
+	git checkout newside1 &&
+	test_write_lines 1 2 three 4 5 6 7 8 9 >numbers &&
+	git add numbers &&
+	git commit -m side1 &&
+
+	git checkout newside2 &&
+	test_write_lines 1 2 drei 4 5 6 7 8 9 >numbers &&
+	git add numbers &&
+	git commit -m side2 &&
+
+	git checkout -b newresolution newside1 &&
+	test_must_fail git merge newside2 &&
+	git checkout --theirs numbers &&
+	git add -u numbers &&
+	git commit -m resolved
+'
+
+test_expect_success 'remerge-diff turns off history simplification' '
+	git log -1 --oneline newresolution >tmp &&
+	cat <<-EOF >>tmp &&
+	diff --git a/numbers b/numbers
+	remerge CONFLICT (content): Merge conflict in numbers
+	index 070e9e7..5335e78 100644
+	--- a/numbers
+	+++ b/numbers
+	@@ -1,10 +1,6 @@
+	 1
+	 2
+	-<<<<<<< 96f1e45 (side1)
+	-three
+	-=======
+	 drei
+	->>>>>>> 4fd522f (side2)
+	 4
+	 5
+	 6
+	EOF
+	# We still have some sha1 hashes above; rip them out so test works
+	# with sha256
+	sed -e "s/[0-9a-f]\{7,\}/HASH/g" tmp >expect &&
+
+	git show --oneline --remerge-diff newresolution -- numbers >tmp &&
+	sed -e "s/[0-9a-f]\{7,\}/HASH/g" tmp >actual &&
+	test_cmp expect actual
+'
+
+test_done
diff --git a/t/t4100-apply-stat.sh b/t/t4100-apply-stat.sh
index 744b8e5..d503547 100755
--- a/t/t4100-apply-stat.sh
+++ b/t/t4100-apply-stat.sh
@@ -6,6 +6,8 @@
 test_description='git apply --stat --summary test, with --recount
 
 '
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 UNC='s/^\(@@ -[1-9][0-9]*\),[0-9]* \(+[1-9][0-9]*\),[0-9]* @@/\1,999 \2,999 @@/'
@@ -17,13 +19,13 @@ do
 	test_expect_success "$title" '
 		git apply --stat --summary \
 			<"$TEST_DIRECTORY/t4100/t-apply-$num.patch" >current &&
-		test_i18ncmp "$TEST_DIRECTORY"/t4100/t-apply-$num.expect current
+		test_cmp "$TEST_DIRECTORY"/t4100/t-apply-$num.expect current
 	'
 
 	test_expect_success "$title with recount" '
 		sed -e "$UNC" <"$TEST_DIRECTORY/t4100/t-apply-$num.patch" |
 		git apply --recount --stat --summary >current &&
-		test_i18ncmp "$TEST_DIRECTORY"/t4100/t-apply-$num.expect current
+		test_cmp "$TEST_DIRECTORY"/t4100/t-apply-$num.expect current
 	'
 done <<\EOF
 rename
diff --git a/t/t4101-apply-nonl.sh b/t/t4101-apply-nonl.sh
index e3443d0..b116919 100755
--- a/t/t4101-apply-nonl.sh
+++ b/t/t4101-apply-nonl.sh
@@ -6,6 +6,8 @@
 test_description='git apply should handle files with incomplete lines.
 
 '
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # setup
diff --git a/t/t4102-apply-rename.sh b/t/t4102-apply-rename.sh
index fae3059..d1e06fc 100755
--- a/t/t4102-apply-rename.sh
+++ b/t/t4102-apply-rename.sh
@@ -6,6 +6,8 @@
 test_description='git apply handling copy/rename patch.
 
 '
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # setup
diff --git a/t/t4103-apply-binary.sh b/t/t4103-apply-binary.sh
index 1b420e3..d370ecf 100755
--- a/t/t4103-apply-binary.sh
+++ b/t/t4103-apply-binary.sh
@@ -6,6 +6,9 @@
 test_description='git apply handling binary patches
 
 '
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -31,64 +34,64 @@ test_expect_success 'setup' '
 	git update-index --add --remove file1 file2 file3 file4 &&
 	git commit -m "Second Version" &&
 
-	git diff-tree -p master binary >B.diff &&
-	git diff-tree -p -C master binary >C.diff &&
+	git diff-tree -p main binary >B.diff &&
+	git diff-tree -p -C main binary >C.diff &&
 
-	git diff-tree -p --binary master binary >BF.diff &&
-	git diff-tree -p --binary -C master binary >CF.diff &&
+	git diff-tree -p --binary main binary >BF.diff &&
+	git diff-tree -p --binary -C main binary >CF.diff &&
 
-	git diff-tree -p --full-index master binary >B-index.diff &&
-	git diff-tree -p -C --full-index master binary >C-index.diff &&
+	git diff-tree -p --full-index main binary >B-index.diff &&
+	git diff-tree -p -C --full-index main binary >C-index.diff &&
 
-	git diff-tree -p --binary --no-prefix master binary -- file3 >B0.diff &&
+	git diff-tree -p --binary --no-prefix main binary -- file3 >B0.diff &&
 
 	git init other-repo &&
 	(
 		cd other-repo &&
-		git fetch .. master &&
+		git fetch .. main &&
 		git reset --hard FETCH_HEAD
 	)
 '
 
 test_expect_success 'stat binary diff -- should not fail.' \
-	'git checkout master &&
+	'git checkout main &&
 	 git apply --stat --summary B.diff'
 
 test_expect_success 'stat binary -p0 diff -- should not fail.' '
-	 git checkout master &&
+	 git checkout main &&
 	 git apply --stat -p0 B0.diff
 '
 
 test_expect_success 'stat binary diff (copy) -- should not fail.' \
-	'git checkout master &&
+	'git checkout main &&
 	 git apply --stat --summary C.diff'
 
 test_expect_success 'check binary diff -- should fail.' \
-	'git checkout master &&
+	'git checkout main &&
 	 test_must_fail git apply --check B.diff'
 
 test_expect_success 'check binary diff (copy) -- should fail.' \
-	'git checkout master &&
+	'git checkout main &&
 	 test_must_fail git apply --check C.diff'
 
 test_expect_success \
 	'check incomplete binary diff with replacement -- should fail.' '
-	git checkout master &&
+	git checkout main &&
 	test_must_fail git apply --check --allow-binary-replacement B.diff
 '
 
 test_expect_success \
     'check incomplete binary diff with replacement (copy) -- should fail.' '
-	 git checkout master &&
+	 git checkout main &&
 	 test_must_fail git apply --check --allow-binary-replacement C.diff
 '
 
 test_expect_success 'check binary diff with replacement.' \
-	'git checkout master &&
+	'git checkout main &&
 	 git apply --check --allow-binary-replacement BF.diff'
 
 test_expect_success 'check binary diff with replacement (copy).' \
-	'git checkout master &&
+	'git checkout main &&
 	 git apply --check --allow-binary-replacement CF.diff'
 
 # Now we start applying them.
@@ -96,7 +99,7 @@ test_expect_success 'check binary diff with replacement (copy).' \
 do_reset () {
 	rm -f file? &&
 	git reset --hard &&
-	git checkout -f master
+	git checkout -f main
 }
 
 test_expect_success 'apply binary diff -- should fail.' \
@@ -155,4 +158,27 @@ test_expect_success 'apply binary -p0 diff' '
 	test -z "$(git diff --name-status binary -- file3)"
 '
 
+test_expect_success 'reject truncated binary diff' '
+	do_reset &&
+
+	# this length is calculated to get us very close to
+	# the 8192-byte strbuf we will use to read in the patch.
+	test-tool genrandom foo 6205 >file1 &&
+	git diff --binary >patch &&
+
+	# truncate the patch at the second "literal" line,
+	# but exclude the trailing newline. We must use perl
+	# for this, since tools like "sed" cannot reliably
+	# produce output without the trailing newline.
+	perl -pe "
+		if (/^literal/ && \$count++ >= 1) {
+			chomp;
+			print;
+			exit 0;
+		}
+	" <patch >patch.trunc &&
+
+	do_reset &&
+	test_must_fail git apply patch.trunc
+'
 test_done
diff --git a/t/t4105-apply-fuzz.sh b/t/t4105-apply-fuzz.sh
index 3266e39..ed814a8 100755
--- a/t/t4105-apply-fuzz.sh
+++ b/t/t4105-apply-fuzz.sh
@@ -2,6 +2,8 @@
 
 test_description='apply with fuzz and offset'
 
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 dotest () {
@@ -15,15 +17,9 @@ dotest () {
 
 test_expect_success setup '
 
-	for i in 1 2 3 4 5 6 7 8 9 10 11 12
-	do
-		echo $i
-	done >file &&
+	test_write_lines 1 2 3 4 5 6 7 8 9 10 11 12 >file &&
 	git update-index --add file &&
-	for i in 1 2 3 4 5 6 7 a b c d e 8 9 10 11 12
-	do
-		echo $i
-	done >file &&
+	test_write_lines 1 2 3 4 5 6 7 a b c d e 8 9 10 11 12 >file &&
 	cat file >expect &&
 	git diff >O0.diff &&
 
diff --git a/t/t4106-apply-stdin.sh b/t/t4106-apply-stdin.sh
index 72467a1..5c150f3 100755
--- a/t/t4106-apply-stdin.sh
+++ b/t/t4106-apply-stdin.sh
@@ -2,6 +2,8 @@
 
 test_description='git apply --numstat - <patch'
 
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -18,7 +20,10 @@ test_expect_success 'git apply --numstat - < patch' '
 '
 
 test_expect_success 'git apply --numstat - < patch patch' '
-	for i in 1 2; do echo "1	1	text"; done >expect &&
+	cat >expect <<-\EOF &&
+	1	1	text
+	1	1	text
+	EOF
 	git apply --numstat - < patch patch >actual &&
 	test_cmp expect actual
 '
diff --git a/t/t4108-apply-threeway.sh b/t/t4108-apply-threeway.sh
index d7349ce..c558282 100755
--- a/t/t4108-apply-threeway.sh
+++ b/t/t4108-apply-threeway.sh
@@ -2,6 +2,9 @@
 
 test_description='git apply --3way'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 print_sanitized_conflicted_diff () {
@@ -24,14 +27,14 @@ test_expect_success setup '
 	test_tick &&
 	test_write_lines 1 two 3 4 5 six 7 >one &&
 	test_write_lines 1 two 3 4 5 6 7 >two &&
-	git commit -a -m master &&
+	git commit -a -m main &&
 
 	git checkout side &&
 	test_write_lines 1 2 3 4 five 6 7 >one &&
 	test_write_lines 1 2 3 4 five 6 7 >two &&
 	git commit -a -m side &&
 
-	git checkout master
+	git checkout main
 '
 
 test_expect_success 'apply without --3way' '
@@ -39,7 +42,7 @@ test_expect_success 'apply without --3way' '
 
 	# should fail to apply
 	git reset --hard &&
-	git checkout master^0 &&
+	git checkout main^0 &&
 	test_must_fail git apply --index P.diff &&
 	# should leave things intact
 	git diff-files --exit-code &&
@@ -52,14 +55,14 @@ test_apply_with_3way () {
 
 	# The corresponding conflicted merge
 	git reset --hard &&
-	git checkout master^0 &&
+	git checkout main^0 &&
 	test_must_fail git merge --no-commit side &&
 	git ls-files -s >expect.ls &&
 	print_sanitized_conflicted_diff >expect.diff &&
 
 	# should fail to apply
 	git reset --hard &&
-	git checkout master^0 &&
+	git checkout main^0 &&
 	test_must_fail git apply --index --3way P.diff &&
 	git ls-files -s >actual.ls &&
 	print_sanitized_conflicted_diff >actual.diff &&
@@ -86,7 +89,7 @@ test_expect_success 'apply with --3way with rerere enabled' '
 
 	# The corresponding conflicted merge
 	git reset --hard &&
-	git checkout master^0 &&
+	git checkout main^0 &&
 	test_must_fail git merge --no-commit side &&
 
 	# Manually resolve and record the resolution
@@ -96,7 +99,7 @@ test_expect_success 'apply with --3way with rerere enabled' '
 
 	# should fail to apply
 	git reset --hard &&
-	git checkout master^0 &&
+	git checkout main^0 &&
 	test_must_fail git apply --index --3way P.diff &&
 
 	# but rerere should have replayed the recorded resolution
@@ -157,4 +160,137 @@ test_expect_success 'apply -3 with add/add conflict (dirty working tree)' '
 	test_cmp three.save three
 '
 
+test_expect_success 'apply -3 with ambiguous repeating file' '
+	git reset --hard &&
+	test_write_lines 1 2 1 2 1 2 1 2 1 2 1 >one_two_repeat &&
+	git add one_two_repeat &&
+	git commit -m "init one" &&
+	test_write_lines 1 2 1 2 1 2 1 2 one 2 1 >one_two_repeat &&
+	git commit -a -m "change one" &&
+
+	git diff HEAD~ >Repeat.diff &&
+	git reset --hard HEAD~ &&
+
+	test_write_lines 1 2 1 2 1 2 one 2 1 2 one >one_two_repeat &&
+	git commit -a -m "change surrounding one" &&
+
+	git apply --index --3way Repeat.diff &&
+	test_write_lines 1 2 1 2 1 2 one 2 one 2 one >expect &&
+
+	test_cmp expect one_two_repeat
+'
+
+test_expect_success 'apply with --3way --cached clean apply' '
+	# Merging side should be similar to applying this patch
+	git diff ...side >P.diff &&
+
+	# The corresponding cleanly applied merge
+	git reset --hard &&
+	git checkout main~ &&
+	git merge --no-commit side &&
+	git ls-files -s >expect.ls &&
+
+	# should succeed
+	git reset --hard &&
+	git checkout main~ &&
+	git apply --cached --3way P.diff &&
+	git ls-files -s >actual.ls &&
+	print_sanitized_conflicted_diff >actual.diff &&
+
+	# The cache should resemble the corresponding merge
+	# (both files at stage #0)
+	test_cmp expect.ls actual.ls &&
+	# However the working directory should not change
+	>expect.diff &&
+	test_cmp expect.diff actual.diff
+'
+
+test_expect_success 'apply with --3way --cached and conflicts' '
+	# Merging side should be similar to applying this patch
+	git diff ...side >P.diff &&
+
+	# The corresponding conflicted merge
+	git reset --hard &&
+	git checkout main^0 &&
+	test_must_fail git merge --no-commit side &&
+	git ls-files -s >expect.ls &&
+
+	# should fail to apply
+	git reset --hard &&
+	git checkout main^0 &&
+	test_must_fail git apply --cached --3way P.diff &&
+	git ls-files -s >actual.ls &&
+	print_sanitized_conflicted_diff >actual.diff &&
+
+	# The cache should resemble the corresponding merge
+	# (one file at stage #0, one file at stages #1 #2 #3)
+	test_cmp expect.ls actual.ls &&
+	# However the working directory should not change
+	>expect.diff &&
+	test_cmp expect.diff actual.diff
+'
+
+test_expect_success 'apply binary file patch' '
+	git reset --hard main &&
+	cp "$TEST_DIRECTORY/test-binary-1.png" bin.png &&
+	git add bin.png &&
+	git commit -m "add binary file" &&
+
+	cp "$TEST_DIRECTORY/test-binary-2.png" bin.png &&
+
+	git diff --binary >bin.diff &&
+	git reset --hard &&
+
+	# Apply must succeed.
+	git apply bin.diff
+'
+
+test_expect_success 'apply binary file patch with 3way' '
+	git reset --hard main &&
+	cp "$TEST_DIRECTORY/test-binary-1.png" bin.png &&
+	git add bin.png &&
+	git commit -m "add binary file" &&
+
+	cp "$TEST_DIRECTORY/test-binary-2.png" bin.png &&
+
+	git diff --binary >bin.diff &&
+	git reset --hard &&
+
+	# Apply must succeed.
+	git apply --3way --index bin.diff
+'
+
+test_expect_success 'apply full-index patch with 3way' '
+	git reset --hard main &&
+	cp "$TEST_DIRECTORY/test-binary-1.png" bin.png &&
+	git add bin.png &&
+	git commit -m "add binary file" &&
+
+	cp "$TEST_DIRECTORY/test-binary-2.png" bin.png &&
+
+	git diff --full-index >bin.diff &&
+	git reset --hard &&
+
+	# Apply must succeed.
+	git apply --3way --index bin.diff
+'
+
+test_expect_success 'apply delete then new patch with 3way' '
+	git reset --hard main &&
+	test_write_lines 2 > delnew &&
+	git add delnew &&
+	git diff --cached >> new.patch &&
+	git reset --hard &&
+	test_write_lines 1 > delnew &&
+	git add delnew &&
+	git commit -m "delnew" &&
+	rm delnew &&
+	git diff >> delete-then-new.patch &&
+	cat new.patch >> delete-then-new.patch &&
+
+	git checkout -- . &&
+	# Apply must succeed.
+	git apply --3way delete-then-new.patch
+'
+
 test_done
diff --git a/t/t4109-apply-multifrag.sh b/t/t4109-apply-multifrag.sh
index ac58083..4dc6d8e 100755
--- a/t/t4109-apply-multifrag.sh
+++ b/t/t4109-apply-multifrag.sh
@@ -6,6 +6,8 @@
 
 test_description='git apply test patches with multiple fragments.'
 
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 cp "$TEST_DIRECTORY/t4109/patch1.patch" .
diff --git a/t/t4110-apply-scan.sh b/t/t4110-apply-scan.sh
index 09f5811..266302a 100755
--- a/t/t4110-apply-scan.sh
+++ b/t/t4110-apply-scan.sh
@@ -7,6 +7,8 @@
 test_description='git apply test for patches which require scanning forwards and backwards.
 
 '
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'git apply scan' '
diff --git a/t/t4111-apply-subdir.sh b/t/t4111-apply-subdir.sh
index 1618a6d..e9a87d7 100755
--- a/t/t4111-apply-subdir.sh
+++ b/t/t4111-apply-subdir.sh
@@ -2,6 +2,7 @@
 
 test_description='patching from inconvenient places'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
diff --git a/t/t4112-apply-renames.sh b/t/t4112-apply-renames.sh
index f9ad183..d53aa42 100755
--- a/t/t4112-apply-renames.sh
+++ b/t/t4112-apply-renames.sh
@@ -7,6 +7,8 @@ test_description='git apply should not get confused with rename/copy.
 
 '
 
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # setup
diff --git a/t/t4114-apply-typechange.sh b/t/t4114-apply-typechange.sh
index ebadbc3..8ff3640 100755
--- a/t/t4114-apply-typechange.sh
+++ b/t/t4114-apply-typechange.sh
@@ -7,6 +7,7 @@ test_description='git apply should not get confused with type changes.
 
 '
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup repository and commits' '
@@ -88,6 +89,13 @@ test_expect_success 'symlink becomes file' '
 	'
 test_debug 'cat patch'
 
+test_expect_success 'symlink becomes file, in reverse' '
+	git checkout -f foo-symlinked-to-bar &&
+	git diff-tree -p HEAD foo-back-to-file > patch &&
+	git checkout foo-back-to-file &&
+	git apply -R --index < patch
+	'
+
 test_expect_success 'binary file becomes symlink' '
 	git checkout -f foo-becomes-binary &&
 	git diff-tree -p --binary HEAD foo-symlinked-to-bar > patch &&
diff --git a/t/t4115-apply-symlink.sh b/t/t4115-apply-symlink.sh
index 872fcda..cbef0a5 100755
--- a/t/t4115-apply-symlink.sh
+++ b/t/t4115-apply-symlink.sh
@@ -7,6 +7,7 @@ test_description='git apply symlinks and partial files
 
 '
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -44,4 +45,100 @@ test_expect_success 'apply --index symlink patch' '
 
 '
 
+test_expect_success 'symlink setup' '
+	ln -s .git symlink &&
+	git add symlink &&
+	git commit -m "add symlink"
+'
+
+test_expect_success SYMLINKS 'symlink escape when creating new files' '
+	test_when_finished "git reset --hard && git clean -dfx" &&
+
+	cat >patch <<-EOF &&
+	diff --git a/symlink b/renamed-symlink
+	similarity index 100%
+	rename from symlink
+	rename to renamed-symlink
+	--
+	diff --git /dev/null b/renamed-symlink/create-me
+	new file mode 100644
+	index 0000000..039727e
+	--- /dev/null
+	+++ b/renamed-symlink/create-me
+	@@ -0,0 +1,1 @@
+	+busted
+	EOF
+
+	test_must_fail git apply patch 2>stderr &&
+	cat >expected_stderr <<-EOF &&
+	error: affected file ${SQ}renamed-symlink/create-me${SQ} is beyond a symbolic link
+	EOF
+	test_cmp expected_stderr stderr &&
+	test_path_is_missing .git/create-me
+'
+
+test_expect_success SYMLINKS 'symlink escape when modifying file' '
+	test_when_finished "git reset --hard && git clean -dfx" &&
+	touch .git/modify-me &&
+
+	cat >patch <<-EOF &&
+	diff --git a/symlink b/renamed-symlink
+	similarity index 100%
+	rename from symlink
+	rename to renamed-symlink
+	--
+	diff --git a/renamed-symlink/modify-me b/renamed-symlink/modify-me
+	index 1111111..2222222 100644
+	--- a/renamed-symlink/modify-me
+	+++ b/renamed-symlink/modify-me
+	@@ -0,0 +1,1 @@
+	+busted
+	EOF
+
+	test_must_fail git apply patch 2>stderr &&
+	cat >expected_stderr <<-EOF &&
+	error: renamed-symlink/modify-me: No such file or directory
+	EOF
+	test_cmp expected_stderr stderr &&
+	test_must_be_empty .git/modify-me
+'
+
+test_expect_success SYMLINKS 'symlink escape when deleting file' '
+	test_when_finished "git reset --hard && git clean -dfx && rm .git/delete-me" &&
+	touch .git/delete-me &&
+
+	cat >patch <<-EOF &&
+	diff --git a/symlink b/renamed-symlink
+	similarity index 100%
+	rename from symlink
+	rename to renamed-symlink
+	--
+	diff --git a/renamed-symlink/delete-me b/renamed-symlink/delete-me
+	deleted file mode 100644
+	index 1111111..0000000 100644
+	EOF
+
+	test_must_fail git apply patch 2>stderr &&
+	cat >expected_stderr <<-EOF &&
+	error: renamed-symlink/delete-me: No such file or directory
+	EOF
+	test_cmp expected_stderr stderr &&
+	test_path_is_file .git/delete-me
+'
+
+test_expect_success SYMLINKS '--reject removes .rej symlink if it exists' '
+	test_when_finished "git reset --hard && git clean -dfx" &&
+
+	test_commit file &&
+	echo modified >file.t &&
+	git diff -- file.t >patch &&
+	echo modified-again >file.t &&
+
+	ln -s foo file.t.rej &&
+	test_must_fail git apply patch --reject 2>err &&
+	test_grep "Rejected hunk" err &&
+	test_path_is_missing foo &&
+	test_path_is_file file.t.rej
+'
+
 test_done
diff --git a/t/t4116-apply-reverse.sh b/t/t4116-apply-reverse.sh
index b99e65c..a9f4ddd 100755
--- a/t/t4116-apply-reverse.sh
+++ b/t/t4116-apply-reverse.sh
@@ -7,18 +7,20 @@ test_description='git apply in reverse
 
 '
 
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
 
-	for i in a b c d e f g h i j k l m n; do echo $i; done >file1 &&
+	test_write_lines a b c d e f g h i j k l m n >file1 &&
 	perl -pe "y/ijk/\\000\\001\\002/" <file1 >file2 &&
 
 	git add file1 file2 &&
 	git commit -m initial &&
 	git tag initial &&
 
-	for i in a b c g h i J K L m o n p q; do echo $i; done >file1 &&
+	test_write_lines a b c g h i J K L m o n p q >file1 &&
 	perl -pe "y/mon/\\000\\001\\002/" <file1 >file2 &&
 
 	git commit -a -m second &&
diff --git a/t/t4117-apply-reject.sh b/t/t4117-apply-reject.sh
index 0ee93fe..c86d05a 100755
--- a/t/t4117-apply-reject.sh
+++ b/t/t4117-apply-reject.sh
@@ -10,25 +10,16 @@ test_description='git apply with rejects
 . ./test-lib.sh
 
 test_expect_success setup '
-	for i in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
-	do
-		echo $i
-	done >file1 &&
+	test_write_lines 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 >file1 &&
 	cat file1 >saved.file1 &&
 	git update-index --add file1 &&
 	git commit -m initial &&
 
-	for i in 1 2 A B 4 5 6 7 8 9 10 11 12 C 13 14 15 16 17 18 19 20 D 21
-	do
-		echo $i
-	done >file1 &&
+	test_write_lines 1 2 A B 4 5 6 7 8 9 10 11 12 C 13 14 15 16 17 18 19 20 D 21 >file1 &&
 	git diff >patch.1 &&
 	cat file1 >clean &&
 
-	for i in 1 E 2 3 4 5 6 7 8 9 10 11 12 C 13 14 15 16 17 18 19 20 F 21
-	do
-		echo $i
-	done >expected &&
+	test_write_lines 1 E 2 3 4 5 6 7 8 9 10 11 12 C 13 14 15 16 17 18 19 20 F 21 >expected &&
 
 	mv file1 file2 &&
 	git update-index --add --remove file1 file2 &&
@@ -38,10 +29,7 @@ test_expect_success setup '
 	mv saved.file1 file1 &&
 	git update-index --add --remove file1 file2 &&
 
-	for i in 1 E 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 F 21
-	do
-		echo $i
-	done >file1 &&
+	test_write_lines 1 E 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 F 21 >file1 &&
 
 	cat file1 >saved.file1
 '
diff --git a/t/t4118-apply-empty-context.sh b/t/t4118-apply-empty-context.sh
index 65f2e4c..69c9c48 100755
--- a/t/t4118-apply-empty-context.sh
+++ b/t/t4118-apply-empty-context.sh
@@ -7,14 +7,12 @@ test_description='git apply with new style GNU diff with empty context
 
 '
 
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
-	{
-		echo; echo;
-		echo A; echo B; echo C;
-		echo;
-	} >file1 &&
+	test_write_lines "" "" A B C "" >file1 &&
 	cat file1 >file1.orig &&
 	{
 		cat file1 &&
diff --git a/t/t4119-apply-config.sh b/t/t4119-apply-config.sh
index a9a0583..208c961 100755
--- a/t/t4119-apply-config.sh
+++ b/t/t4119-apply-config.sh
@@ -7,6 +7,8 @@ test_description='git apply --whitespace=strip and configuration file.
 
 '
 
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
diff --git a/t/t4120-apply-popt.sh b/t/t4120-apply-popt.sh
index 497b628..697e86c 100755
--- a/t/t4120-apply-popt.sh
+++ b/t/t4120-apply-popt.sh
@@ -31,7 +31,7 @@ test_expect_success 'apply git diff with -p2' '
 test_expect_success 'apply with too large -p' '
 	cp file1.saved file1 &&
 	test_must_fail git apply --stat -p3 patch.file 2>err &&
-	test_i18ngrep "removing 3 leading" err
+	test_grep "removing 3 leading" err
 '
 
 test_expect_success 'apply (-p2) traditional diff with funny filenames' '
@@ -53,7 +53,7 @@ test_expect_success 'apply (-p2) traditional diff with funny filenames' '
 test_expect_success 'apply with too large -p and fancy filename' '
 	cp file1.saved file1 &&
 	test_must_fail git apply --stat -p3 patch.escaped 2>err &&
-	test_i18ngrep "removing 3 leading" err
+	test_grep "removing 3 leading" err
 '
 
 test_expect_success 'apply (-p2) diff, mode change only' '
diff --git a/t/t4121-apply-diffs.sh b/t/t4121-apply-diffs.sh
index 66368ef..a80cec9 100755
--- a/t/t4121-apply-diffs.sh
+++ b/t/t4121-apply-diffs.sh
@@ -1,6 +1,10 @@
 #!/bin/sh
 
 test_description='git apply for contextually independent diffs'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 echo '1
@@ -23,7 +27,7 @@ test_expect_success 'setup' \
 	git commit -a -q -m 2 &&
 	echo 9 >>file &&
 	git commit -a -q -m 3 &&
-	git checkout master'
+	git checkout main'
 
 test_expect_success \
 	'check if contextually independent diffs for the same file apply' \
diff --git a/t/t4122-apply-symlink-inside.sh b/t/t4122-apply-symlink-inside.sh
index 4acb3f3..2089d84 100755
--- a/t/t4122-apply-symlink-inside.sh
+++ b/t/t4122-apply-symlink-inside.sh
@@ -1,6 +1,10 @@
 #!/bin/sh
 
 test_description='apply to deeper directory without getting fooled with symlink'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -35,11 +39,11 @@ test_expect_success apply '
 
 test_expect_success 'check result' '
 
-	git diff --exit-code master &&
-	git diff --exit-code --cached master &&
+	git diff --exit-code main &&
+	git diff --exit-code --cached main &&
 	test_tick &&
 	git commit -m replay &&
-	T1=$(git rev-parse "master^{tree}") &&
+	T1=$(git rev-parse "main^{tree}") &&
 	T2=$(git rev-parse "HEAD^{tree}") &&
 	test "z$T1" = "z$T2"
 
@@ -91,19 +95,19 @@ test_expect_success SYMLINKS 'do not follow symbolic link (same input)' '
 
 	# same input creates a confusing symbolic link
 	test_must_fail git apply patch 2>error-wt &&
-	test_i18ngrep "beyond a symbolic link" error-wt &&
+	test_grep "beyond a symbolic link" error-wt &&
 	test_path_is_missing arch/x86_64/dir &&
 	test_path_is_missing arch/i386/dir/file &&
 
 	test_must_fail git apply --index patch 2>error-ix &&
-	test_i18ngrep "beyond a symbolic link" error-ix &&
+	test_grep "beyond a symbolic link" error-ix &&
 	test_path_is_missing arch/x86_64/dir &&
 	test_path_is_missing arch/i386/dir/file &&
 	test_must_fail git ls-files --error-unmatch arch/x86_64/dir &&
 	test_must_fail git ls-files --error-unmatch arch/i386/dir &&
 
 	test_must_fail git apply --cached patch 2>error-ct &&
-	test_i18ngrep "beyond a symbolic link" error-ct &&
+	test_grep "beyond a symbolic link" error-ct &&
 	test_must_fail git ls-files --error-unmatch arch/x86_64/dir &&
 	test_must_fail git ls-files --error-unmatch arch/i386/dir &&
 
@@ -131,23 +135,23 @@ test_expect_success SYMLINKS 'do not follow symbolic link (existing)' '
 	git add arch/x86_64/dir &&
 
 	test_must_fail git apply add_file.patch 2>error-wt-add &&
-	test_i18ngrep "beyond a symbolic link" error-wt-add &&
+	test_grep "beyond a symbolic link" error-wt-add &&
 	test_path_is_missing arch/i386/dir/file &&
 
 	mkdir arch/i386/dir &&
 	>arch/i386/dir/file &&
 	test_must_fail git apply del_file.patch 2>error-wt-del &&
-	test_i18ngrep "beyond a symbolic link" error-wt-del &&
+	test_grep "beyond a symbolic link" error-wt-del &&
 	test_path_is_file arch/i386/dir/file &&
 	rm arch/i386/dir/file &&
 
 	test_must_fail git apply --index add_file.patch 2>error-ix-add &&
-	test_i18ngrep "beyond a symbolic link" error-ix-add &&
+	test_grep "beyond a symbolic link" error-ix-add &&
 	test_path_is_missing arch/i386/dir/file &&
 	test_must_fail git ls-files --error-unmatch arch/i386/dir &&
 
 	test_must_fail git apply --cached add_file.patch 2>error-ct-file &&
-	test_i18ngrep "beyond a symbolic link" error-ct-file &&
+	test_grep "beyond a symbolic link" error-ct-file &&
 	test_must_fail git ls-files --error-unmatch arch/i386/dir
 '
 
diff --git a/t/t4123-apply-shrink.sh b/t/t4123-apply-shrink.sh
index 984157f..3ef8461 100755
--- a/t/t4123-apply-shrink.sh
+++ b/t/t4123-apply-shrink.sh
@@ -39,20 +39,8 @@ test_expect_success setup '
 '
 
 test_expect_success 'apply should fail gracefully' '
-
-	if git apply --index patch
-	then
-		echo Oops, should not have succeeded
-		false
-	else
-		status=$?
-		echo "Status was $status"
-		if test -f .git/index.lock
-		then
-			echo Oops, should not have crashed
-			false
-		fi
-	fi
+	test_must_fail git apply --index patch &&
+	test_path_is_missing .git/index.lock
 '
 
 test_done
diff --git a/t/t4124-apply-ws-rule.sh b/t/t4124-apply-ws-rule.sh
index 0ca2982..485c7d2 100755
--- a/t/t4124-apply-ws-rule.sh
+++ b/t/t4124-apply-ws-rule.sh
@@ -230,10 +230,10 @@ test_expect_success 'blank at EOF with --whitespace=fix (1)' '
 	test_might_fail git config --unset core.whitespace &&
 	rm -f .gitattributes &&
 
-	{ echo a; echo b; echo c; } >one &&
+	test_write_lines a b c >one &&
 	git add one &&
-	{ echo a; echo b; echo c; } >expect &&
-	{ cat expect; echo; } >one &&
+	test_write_lines a b c >expect &&
+	{ cat expect && echo; } >one &&
 	git diff -- one >patch &&
 
 	git checkout one &&
@@ -242,10 +242,10 @@ test_expect_success 'blank at EOF with --whitespace=fix (1)' '
 '
 
 test_expect_success 'blank at EOF with --whitespace=fix (2)' '
-	{ echo a; echo b; echo c; } >one &&
+	test_write_lines a b c >one &&
 	git add one &&
-	{ echo a; echo c; } >expect &&
-	{ cat expect; echo; echo; } >one &&
+	test_write_lines a b >expect &&
+	{ cat expect && test_write_lines "" ""; } >one &&
 	git diff -- one >patch &&
 
 	git checkout one &&
@@ -254,10 +254,10 @@ test_expect_success 'blank at EOF with --whitespace=fix (2)' '
 '
 
 test_expect_success 'blank at EOF with --whitespace=fix (3)' '
-	{ echo a; echo b; echo; } >one &&
+	test_write_lines a b "" >one &&
 	git add one &&
-	{ echo a; echo c; echo; } >expect &&
-	{ cat expect; echo; echo; } >one &&
+	test_write_lines a c "" >expect &&
+	{ cat expect && test_write_lines "" ""; } >one &&
 	git diff -- one >patch &&
 
 	git checkout one &&
@@ -266,9 +266,9 @@ test_expect_success 'blank at EOF with --whitespace=fix (3)' '
 '
 
 test_expect_success 'blank at end of hunk, not at EOF with --whitespace=fix' '
-	{ echo a; echo b; echo; echo; echo; echo; echo; echo d; } >one &&
+	test_write_lines a b "" "" "" "" "" d >one &&
 	git add one &&
-	{ echo a; echo c; echo; echo; echo; echo; echo; echo; echo d; } >expect &&
+	test_write_lines a b "" "" "" "" "" "" d >expect &&
 	cp expect one &&
 	git diff -- one >patch &&
 
@@ -278,7 +278,7 @@ test_expect_success 'blank at end of hunk, not at EOF with --whitespace=fix' '
 '
 
 test_expect_success 'blank at EOF with --whitespace=warn' '
-	{ echo a; echo b; echo c; } >one &&
+	test_write_lines a b c >one &&
 	git add one &&
 	echo >>one &&
 	cat one >expect &&
@@ -291,7 +291,7 @@ test_expect_success 'blank at EOF with --whitespace=warn' '
 '
 
 test_expect_success 'blank at EOF with --whitespace=error' '
-	{ echo a; echo b; echo c; } >one &&
+	test_write_lines a b c >one &&
 	git add one &&
 	cat one >expect &&
 	echo >>one &&
@@ -304,7 +304,7 @@ test_expect_success 'blank at EOF with --whitespace=error' '
 '
 
 test_expect_success 'blank but not empty at EOF' '
-	{ echo a; echo b; echo c; } >one &&
+	test_write_lines a b c >one &&
 	git add one &&
 	echo "   " >>one &&
 	cat one >expect &&
@@ -317,13 +317,13 @@ test_expect_success 'blank but not empty at EOF' '
 '
 
 test_expect_success 'applying beyond EOF requires one non-blank context line' '
-	{ echo; echo; echo; echo; } >one &&
+	test_write_lines "" "" "" "" >one &&
 	git add one &&
-	{ echo b; } >>one &&
+	echo b >>one &&
 	git diff -- one >patch &&
 
 	git checkout one &&
-	{ echo a; echo; } >one &&
+	test_write_lines a "" >one &&
 	cp one expect &&
 	test_must_fail git apply --whitespace=fix patch &&
 	test_cmp expect one &&
@@ -333,7 +333,7 @@ test_expect_success 'applying beyond EOF requires one non-blank context line' '
 
 test_expect_success 'tons of blanks at EOF should not apply' '
 	for i in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16; do
-		echo; echo; echo; echo;
+		test_write_lines "" "" "" "" || return 1
 	done >one &&
 	git add one &&
 	echo a >>one &&
@@ -362,9 +362,9 @@ test_expect_success 'missing blank line at end with --whitespace=fix' '
 '
 
 test_expect_success 'two missing blank lines at end with --whitespace=fix' '
-	{ echo a; echo; echo b; echo c; } >one &&
+	test_write_lines a "" b c >one &&
 	cp one no-blank-lines &&
-	{ echo; echo; } >>one &&
+	test_write_lines "" "" >>one &&
 	git add one &&
 	echo d >>one &&
 	cp one expect &&
@@ -381,9 +381,9 @@ test_expect_success 'two missing blank lines at end with --whitespace=fix' '
 '
 
 test_expect_success 'missing blank line at end, insert before end, --whitespace=fix' '
-	{ echo a; echo; } >one &&
+	test_write_lines a "" >one &&
 	git add one &&
-	{ echo b; echo a; echo; } >one &&
+	test_write_lines b a "" >one &&
 	cp one expect &&
 	git diff -- one >patch &&
 	echo a >one &&
@@ -393,10 +393,10 @@ test_expect_success 'missing blank line at end, insert before end, --whitespace=
 '
 
 test_expect_success 'shrink file with tons of missing blanks at end of file' '
-	{ echo a; echo b; echo c; } >one &&
+	test_write_lines a b c >one &&
 	cp one no-blank-lines &&
 	for i in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16; do
-		echo; echo; echo; echo;
+		test_write_lines "" "" "" "" || return 1
 	done >>one &&
 	git add one &&
 	echo a >one &&
@@ -412,9 +412,9 @@ test_expect_success 'shrink file with tons of missing blanks at end of file' '
 '
 
 test_expect_success 'missing blanks at EOF must only match blank lines' '
-	{ echo a; echo b; } >one &&
+	test_write_lines a b >one &&
 	git add one &&
-	{ echo c; echo d; } >>one &&
+	test_write_lines c d >>one &&
 	git diff -- one >patch &&
 
 	echo a >one &&
@@ -434,9 +434,9 @@ test_expect_success 'missing blank line should match context line with spaces' '
 	git add one &&
 	echo d >>one &&
 	git diff -- one >patch &&
-	{ echo a; echo b; echo c; } >one &&
+	test_write_lines a b c >one &&
 	cp one expect &&
-	{ echo; echo d; } >>expect &&
+	test_write_lines "" d >>expect &&
 	git add one &&
 
 	git apply --whitespace=fix patch &&
@@ -455,7 +455,7 @@ test_expect_success 'same, but with the --ignore-space-option' '
 	echo d >>one &&
 	cp one expect &&
 	git diff -- one >patch &&
-	{ echo a; echo b; echo c; } >one &&
+	test_write_lines a b c >one &&
 	git add one &&
 
 	git checkout-index -f one &&
diff --git a/t/t4125-apply-ws-fuzz.sh b/t/t4125-apply-ws-fuzz.sh
index 9671de7..090987c 100755
--- a/t/t4125-apply-ws-fuzz.sh
+++ b/t/t4125-apply-ws-fuzz.sh
@@ -10,10 +10,7 @@ test_expect_success setup '
 	git add file &&
 
 	# file-0 is full of whitespace breakages
-	for l in a bb c d eeee f ggg h
-	do
-		echo "$l "
-	done >file-0 &&
+	printf "%s \n" a bb c d eeee f ggg h >file-0 &&
 
 	# patch-0 creates a whitespace broken file
 	cat file-0 >file &&
diff --git a/t/t4126-apply-empty.sh b/t/t4126-apply-empty.sh
index ceb6a79..56210b5 100755
--- a/t/t4126-apply-empty.sh
+++ b/t/t4126-apply-empty.sh
@@ -2,6 +2,7 @@
 
 test_description='apply empty'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -9,10 +10,9 @@ test_expect_success setup '
 	git add empty &&
 	test_tick &&
 	git commit -m initial &&
-	for i in a b c d e
-	do
-		echo $i
-	done >empty &&
+	git commit --allow-empty -m "empty commit" &&
+	git format-patch --always HEAD~ >empty.patch &&
+	test_write_lines a b c d e >empty &&
 	cat empty >expect &&
 	git diff |
 	sed -e "/^diff --git/d" \
@@ -25,33 +25,69 @@ test_expect_success setup '
 '
 
 test_expect_success 'apply empty' '
-	git reset --hard &&
 	rm -f missing &&
+	test_when_finished "git reset --hard" &&
 	git apply patch0 &&
 	test_cmp expect empty
 '
 
+test_expect_success 'apply empty patch fails' '
+	test_when_finished "git reset --hard" &&
+	test_must_fail git apply empty.patch &&
+	test_must_fail git apply - </dev/null
+'
+
+test_expect_success 'apply with --allow-empty succeeds' '
+	test_when_finished "git reset --hard" &&
+	git apply --allow-empty empty.patch &&
+	git apply --allow-empty - </dev/null
+'
+
 test_expect_success 'apply --index empty' '
-	git reset --hard &&
 	rm -f missing &&
+	test_when_finished "git reset --hard" &&
 	git apply --index patch0 &&
 	test_cmp expect empty &&
 	git diff --exit-code
 '
 
 test_expect_success 'apply create' '
-	git reset --hard &&
 	rm -f missing &&
+	test_when_finished "git reset --hard" &&
 	git apply patch1 &&
 	test_cmp expect missing
 '
 
 test_expect_success 'apply --index create' '
-	git reset --hard &&
 	rm -f missing &&
+	test_when_finished "git reset --hard" &&
 	git apply --index patch1 &&
 	test_cmp expect missing &&
 	git diff --exit-code
 '
 
+test_expect_success !MINGW 'apply with no-contents and a funny pathname' '
+	test_when_finished "rm -fr \"funny \"; git reset --hard" &&
+
+	mkdir "funny " &&
+	>"funny /empty" &&
+	git add "funny /empty" &&
+	git diff HEAD -- "funny /" >sample.patch &&
+	git diff -R HEAD -- "funny /" >elpmas.patch &&
+
+	git reset --hard &&
+
+	git apply --stat --check --apply sample.patch &&
+	test_must_be_empty "funny /empty" &&
+
+	git apply --stat --check --apply elpmas.patch &&
+	test_path_is_missing "funny /empty" &&
+
+	git apply -R --stat --check --apply elpmas.patch &&
+	test_must_be_empty "funny /empty" &&
+
+	git apply -R --stat --check --apply sample.patch &&
+	test_path_is_missing "funny /empty"
+'
+
 test_done
diff --git a/t/t4127-apply-same-fn.sh b/t/t4127-apply-same-fn.sh
index 972946c..aa5cfae 100755
--- a/t/t4127-apply-same-fn.sh
+++ b/t/t4127-apply-same-fn.sh
@@ -2,6 +2,8 @@
 
 test_description='apply same filename'
 
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 modify () {
@@ -10,10 +12,7 @@ modify () {
 }
 
 test_expect_success setup '
-	for i in a b c d e f g h i j k l m
-	do
-		echo $i
-	done >same_fn &&
+	test_write_lines a b c d e f g h i j k l m >same_fn &&
 	cp same_fn other_fn &&
 	git add same_fn other_fn &&
 	git commit -m initial
@@ -32,6 +31,10 @@ test_expect_success 'apply same filename with independent changes' '
 
 test_expect_success 'apply same filename with overlapping changes' '
 	git reset --hard &&
+
+	# Store same_fn so that we can check apply -R in next test
+	cp same_fn same_fn1 &&
+
 	modify "s/^d/z/" same_fn &&
 	git diff > patch0 &&
 	git add same_fn &&
@@ -43,6 +46,11 @@ test_expect_success 'apply same filename with overlapping changes' '
 	test_cmp same_fn same_fn2
 '
 
+test_expect_success 'apply same filename with overlapping changes, in reverse' '
+	git apply -R patch0 &&
+	test_cmp same_fn same_fn1
+'
+
 test_expect_success 'apply same new filename after rename' '
 	git reset --hard &&
 	git mv same_fn new_fn &&
diff --git a/t/t4128-apply-root.sh b/t/t4128-apply-root.sh
index 6cc741a..ed94c90 100755
--- a/t/t4128-apply-root.sh
+++ b/t/t4128-apply-root.sh
@@ -2,6 +2,7 @@
 
 test_description='apply same filename'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -24,10 +25,11 @@ diff a/bla/blub/dir/file b/bla/blub/dir/file
 EOF
 
 test_expect_success 'apply --directory -p (1)' '
-
 	git apply --directory=some/sub -p3 --index patch &&
-	test Bello = $(git show :some/sub/dir/file) &&
-	test Bello = $(cat some/sub/dir/file)
+	echo Bello >expect &&
+	git show :some/sub/dir/file >actual &&
+	test_cmp expect actual &&
+	test_cmp expect some/sub/dir/file
 
 '
 
@@ -35,8 +37,10 @@ test_expect_success 'apply --directory -p (2) ' '
 
 	git reset --hard initial &&
 	git apply --directory=some/sub/ -p3 --index patch &&
-	test Bello = $(git show :some/sub/dir/file) &&
-	test Bello = $(cat some/sub/dir/file)
+	echo Bello >expect &&
+	git show :some/sub/dir/file >actual &&
+	test_cmp expect actual &&
+	test_cmp expect some/sub/dir/file
 
 '
 
@@ -53,8 +57,10 @@ EOF
 test_expect_success 'apply --directory (new file)' '
 	git reset --hard initial &&
 	git apply --directory=some/sub/dir/ --index patch &&
-	test content = $(git show :some/sub/dir/newfile) &&
-	test content = $(cat some/sub/dir/newfile)
+	echo content >expect &&
+	git show :some/sub/dir/newfile >actual &&
+	test_cmp expect actual &&
+	test_cmp expect some/sub/dir/newfile
 '
 
 cat > patch << EOF
@@ -70,8 +76,10 @@ EOF
 test_expect_success 'apply --directory -p (new file)' '
 	git reset --hard initial &&
 	git apply -p2 --directory=some/sub/dir/ --index patch &&
-	test content = $(git show :some/sub/dir/newfile2) &&
-	test content = $(cat some/sub/dir/newfile2)
+	echo content >expect &&
+	git show :some/sub/dir/newfile2 >actual &&
+	test_cmp expect actual &&
+	test_cmp expect some/sub/dir/newfile2
 '
 
 cat > patch << EOF
@@ -89,7 +97,8 @@ test_expect_success 'apply --directory (delete file)' '
 	echo content >some/sub/dir/delfile &&
 	git add some/sub/dir/delfile &&
 	git apply --directory=some/sub/dir/ --index patch &&
-	! (git ls-files | grep delfile)
+	git ls-files >out &&
+	! grep delfile out
 '
 
 cat > patch << 'EOF'
@@ -105,8 +114,10 @@ EOF
 test_expect_success 'apply --directory (quoted filename)' '
 	git reset --hard initial &&
 	git apply --directory=some/sub/dir/ --index patch &&
-	test content = $(git show :some/sub/dir/quotefile) &&
-	test content = $(cat some/sub/dir/quotefile)
+	echo content >expect &&
+	git show :some/sub/dir/quotefile >actual &&
+	test_cmp expect actual &&
+	test_cmp expect some/sub/dir/quotefile
 '
 
 test_done
diff --git a/t/t4129-apply-samemode.sh b/t/t4129-apply-samemode.sh
index 5cdd76d..4eb8444 100755
--- a/t/t4129-apply-samemode.sh
+++ b/t/t4129-apply-samemode.sh
@@ -2,6 +2,8 @@
 
 test_description='applying patch with mode bits'
 
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -39,7 +41,8 @@ test_expect_success FILEMODE 'same mode (index only)' '
 	chmod +x file &&
 	git add file &&
 	git apply --cached patch-0.txt &&
-	git ls-files -s file | grep "^100755"
+	git ls-files -s file >ls-files-output &&
+	test_grep "^100755" ls-files-output
 '
 
 test_expect_success FILEMODE 'mode update (no index)' '
@@ -58,19 +61,73 @@ test_expect_success FILEMODE 'mode update (with index)' '
 test_expect_success FILEMODE 'mode update (index only)' '
 	git reset --hard &&
 	git apply --cached patch-1.txt &&
-	git ls-files -s file | grep "^100755"
+	git ls-files -s file >ls-files-output &&
+	test_grep "^100755" ls-files-output
 '
 
 test_expect_success FILEMODE 'empty mode is rejected' '
 	git reset --hard &&
 	test_must_fail git apply patch-empty-mode.txt 2>err &&
-	test_i18ngrep "invalid mode" err
+	test_grep "invalid mode" err
 '
 
 test_expect_success FILEMODE 'bogus mode is rejected' '
 	git reset --hard &&
 	test_must_fail git apply patch-bogus-mode.txt 2>err &&
-	test_i18ngrep "invalid mode" err
+	test_grep "invalid mode" err
+'
+
+test_expect_success POSIXPERM 'do not use core.sharedRepository for working tree files' '
+	git reset --hard &&
+	test_config core.sharedRepository 0666 &&
+	(
+		# Remove a default ACL if possible.
+		(setfacl -k . 2>/dev/null || true) &&
+		umask 0077 &&
+
+		# Test both files (f1) and leading dirs (d)
+		mkdir d &&
+		touch f1 d/f2 &&
+		git add f1 d/f2 &&
+		git diff --staged >patch-f1-and-f2.txt &&
+
+		rm -rf d f1 &&
+		git apply patch-f1-and-f2.txt &&
+
+		echo "-rw-------" >f1_mode.expected &&
+		echo "drwx------" >d_mode.expected &&
+		test_modebits f1 >f1_mode.actual &&
+		test_modebits d >d_mode.actual &&
+		test_cmp f1_mode.expected f1_mode.actual &&
+		test_cmp d_mode.expected d_mode.actual
+	)
+'
+
+test_expect_success 'git apply respects core.fileMode' '
+	test_config core.fileMode false &&
+	echo true >script.sh &&
+	git add --chmod=+x script.sh &&
+	git ls-files -s script.sh >ls-files-output &&
+	test_grep "^100755" ls-files-output &&
+	test_tick && git commit -m "Add script" &&
+	git ls-tree -r HEAD script.sh >ls-tree-output &&
+	test_grep "^100755" ls-tree-output &&
+
+	echo true >>script.sh &&
+	test_tick && git commit -m "Modify script" script.sh &&
+	git format-patch -1 --stdout >patch &&
+	test_grep "^index.*100755$" patch &&
+
+	git switch -c branch HEAD^ &&
+	git apply --index patch 2>err &&
+	test_grep ! "has type 100644, expected 100755" err &&
+	git reset --hard &&
+
+	git apply patch 2>err &&
+	test_grep ! "has type 100644, expected 100755" err &&
+
+	git apply --cached patch 2>err &&
+	test_grep ! "has type 100644, expected 100755" err
 '
 
 test_done
diff --git a/t/t4130-apply-criss-cross-rename.sh b/t/t4130-apply-criss-cross-rename.sh
index f8a313b..f3ea632 100755
--- a/t/t4130-apply-criss-cross-rename.sh
+++ b/t/t4130-apply-criss-cross-rename.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='git apply handling criss-cross rename patch.'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 create_file() {
diff --git a/t/t4132-apply-removal.sh b/t/t4132-apply-removal.sh
index fec1d6f..c1e3049 100755
--- a/t/t4132-apply-removal.sh
+++ b/t/t4132-apply-removal.sh
@@ -4,6 +4,8 @@
 
 test_description='git-apply notices removal patches generated by GNU diff'
 
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
diff --git a/t/t4133-apply-filenames.sh b/t/t4133-apply-filenames.sh
index c5ed3b1..c21ddb2 100755
--- a/t/t4133-apply-filenames.sh
+++ b/t/t4133-apply-filenames.sh
@@ -5,6 +5,8 @@
 
 test_description='git apply filename consistency check'
 
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -30,9 +32,9 @@ EOF
 
 test_expect_success 'apply diff with inconsistent filenames in headers' '
 	test_must_fail git apply bad1.patch 2>err &&
-	test_i18ngrep "inconsistent new filename" err &&
+	test_grep "inconsistent new filename" err &&
 	test_must_fail git apply bad2.patch 2>err &&
-	test_i18ngrep "inconsistent old filename" err
+	test_grep "inconsistent old filename" err
 '
 
 test_expect_success 'apply diff with new filename missing from headers' '
@@ -44,7 +46,7 @@ test_expect_success 'apply diff with new filename missing from headers' '
 	+1
 	EOF
 	test_must_fail git apply missing_new_filename.diff 2>err &&
-	test_i18ngrep "lacks filename information" err
+	test_grep "lacks filename information" err
 '
 
 test_expect_success 'apply diff with old filename missing from headers' '
@@ -56,7 +58,7 @@ test_expect_success 'apply diff with old filename missing from headers' '
 	-1
 	EOF
 	test_must_fail git apply missing_old_filename.diff 2>err &&
-	test_i18ngrep "lacks filename information" err
+	test_grep "lacks filename information" err
 '
 
 test_done
diff --git a/t/t4134-apply-submodule.sh b/t/t4134-apply-submodule.sh
index d1c16ba..aceb4c4 100755
--- a/t/t4134-apply-submodule.sh
+++ b/t/t4134-apply-submodule.sh
@@ -5,6 +5,8 @@
 
 test_description='git apply submodule tests'
 
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
diff --git a/t/t4135-apply-weird-filenames.sh b/t/t4135-apply-weird-filenames.sh
index 6bc3fb9..d3502c6 100755
--- a/t/t4135-apply-weird-filenames.sh
+++ b/t/t4135-apply-weird-filenames.sh
@@ -2,6 +2,7 @@
 
 test_description='git apply with weird postimage filenames'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
diff --git a/t/t4136-apply-check.sh b/t/t4136-apply-check.sh
index 4c3f264..dfec1c5 100755
--- a/t/t4136-apply-check.sh
+++ b/t/t4136-apply-check.sh
@@ -2,6 +2,8 @@
 
 test_description='git apply should exit non-zero with unrecognized input.'
 
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
diff --git a/t/t4138-apply-ws-expansion.sh b/t/t4138-apply-ws-expansion.sh
index b19faeb..8bbf826 100755
--- a/t/t4138-apply-ws-expansion.sh
+++ b/t/t4138-apply-ws-expansion.sh
@@ -29,8 +29,8 @@ test_expect_success setup '
 	x=1 &&
 	while test $x -lt $n
 	do
-		printf "%63s%d\n" "" $x >>after
-		x=$(( $x + 1 ))
+		printf "%63s%d\n" "" $x >>after &&
+		x=$(( $x + 1 )) || return 1
 	done &&
 	printf "\t%s\n" d e f >>after &&
 	test_expect_code 1 git diff --no-index before after >patch2.patch.raw &&
@@ -40,8 +40,8 @@ test_expect_success setup '
 	x=1 &&
 	while test $x -lt $n
 	do
-		printf "%63s%d\n" "" $x >>expect-2
-		x=$(( $x + 1 ))
+		printf "%63s%d\n" "" $x >>expect-2 &&
+		x=$(( $x + 1 )) || return 1
 	done &&
 	printf "%64s\n" d e f >>expect-2 &&
 
@@ -52,8 +52,8 @@ test_expect_success setup '
 	x=0 &&
 	while test $x -lt $n
 	do
-		printf "%63s%02d\n" "" $x >>after
-		x=$(( $x + 1 ))
+		printf "%63s%02d\n" "" $x >>after &&
+		x=$(( $x + 1 )) || return 1
 	done &&
 	printf "\t%s\n" d e f >>after &&
 	test_expect_code 1 git diff --no-index before after >patch3.patch.raw &&
@@ -63,8 +63,8 @@ test_expect_success setup '
 	x=0 &&
 	while test $x -lt $n
 	do
-		printf "%63s%02d\n" "" $x >>expect-3
-		x=$(( $x + 1 ))
+		printf "%63s%02d\n" "" $x >>expect-3 &&
+		x=$(( $x + 1 )) || return 1
 	done &&
 	printf "%64s\n" d e f >>expect-3 &&
 
@@ -73,16 +73,16 @@ test_expect_success setup '
 	x=0 &&
 	while test $x -lt 50
 	do
-		printf "\t%02d\n" $x >>before
-		x=$(( $x + 1 ))
+		printf "\t%02d\n" $x >>before &&
+		x=$(( $x + 1 )) || return 1
 	done &&
 	cat before >after &&
 	printf "%64s\n" a b c >>after &&
 	while test $x -lt 100
 	do
-		printf "\t%02d\n" $x >>before
-		printf "\t%02d\n" $x >>after
-		x=$(( $x + 1 ))
+		printf "\t%02d\n" $x >>before &&
+		printf "\t%02d\n" $x >>after &&
+		x=$(( $x + 1 )) || return 1
 	done &&
 	test_expect_code 1 git diff --no-index before after >patch4.patch.raw &&
 	sed -e "s/before/test-4/" -e "s/after/test-4/" patch4.patch.raw >patch4.patch &&
@@ -90,16 +90,16 @@ test_expect_success setup '
 	x=0 &&
 	while test $x -lt 50
 	do
-		printf "%63s%02d\n" "" $x >>test-4
-		x=$(( $x + 1 ))
+		printf "%63s%02d\n" "" $x >>test-4 &&
+		x=$(( $x + 1 )) || return 1
 	done &&
 	cat test-4 >expect-4 &&
 	printf "%64s\n" a b c >>expect-4 &&
 	while test $x -lt 100
 	do
-		printf "%63s%02d\n" "" $x >>test-4
-		printf "%63s%02d\n" "" $x >>expect-4
-		x=$(( $x + 1 ))
+		printf "%63s%02d\n" "" $x >>test-4 &&
+		printf "%63s%02d\n" "" $x >>expect-4 &&
+		x=$(( $x + 1 )) || return 1
 	done &&
 
 	git config core.whitespace tab-in-indent,tabwidth=63 &&
diff --git a/t/t4139-apply-escape.sh b/t/t4139-apply-escape.sh
index 45b5660..e5c7439 100755
--- a/t/t4139-apply-escape.sh
+++ b/t/t4139-apply-escape.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='paths written by git-apply cannot escape the working tree'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # tests will try to write to ../foo, and we do not
diff --git a/t/t4140-apply-ita.sh b/t/t4140-apply-ita.sh
new file mode 100755
index 0000000..b375aca
--- /dev/null
+++ b/t/t4140-apply-ita.sh
@@ -0,0 +1,57 @@
+#!/bin/sh
+
+test_description='git apply of i-t-a file'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+test_expect_success setup '
+	test_write_lines 1 2 3 4 5 >blueprint &&
+
+	cat blueprint >test-file &&
+	git add -N test-file &&
+	git diff >creation-patch &&
+	grep "new file mode 100644" creation-patch &&
+
+	rm -f test-file &&
+	git diff >deletion-patch &&
+	grep "deleted file mode 100644" deletion-patch
+'
+
+test_expect_success 'apply creation patch to ita path (--cached)' '
+	git rm -f test-file &&
+	cat blueprint >test-file &&
+	git add -N test-file &&
+
+	git apply --cached creation-patch &&
+	git cat-file blob :test-file >actual &&
+	test_cmp blueprint actual
+'
+
+test_expect_success 'apply creation patch to ita path (--index)' '
+	git rm -f test-file &&
+	cat blueprint >test-file &&
+	git add -N test-file &&
+	rm -f test-file &&
+
+	test_must_fail git apply --index creation-patch
+'
+
+test_expect_success 'apply deletion patch to ita path (--cached)' '
+	git rm -f test-file &&
+	cat blueprint >test-file &&
+	git add -N test-file &&
+
+	git apply --cached deletion-patch &&
+	test_must_fail git ls-files --stage --error-unmatch test-file
+'
+
+test_expect_success 'apply deletion patch to ita path (--index)' '
+	cat blueprint >test-file &&
+	git add -N test-file &&
+
+	test_must_fail git apply --index deletion-patch &&
+	git ls-files --stage --error-unmatch test-file
+'
+
+test_done
diff --git a/t/t4141-apply-too-large.sh b/t/t4141-apply-too-large.sh
new file mode 100755
index 0000000..20cc120
--- /dev/null
+++ b/t/t4141-apply-too-large.sh
@@ -0,0 +1,23 @@
+#!/bin/sh
+
+test_description='git apply with too-large patch'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+test_expect_success EXPENSIVE 'git apply rejects patches that are too large' '
+	sz=$((1024 * 1024 * 1023)) &&
+	{
+		cat <<-\EOF &&
+		diff --git a/file b/file
+		new file mode 100644
+		--- /dev/null
+		+++ b/file
+		@@ -0,0 +1 @@
+		EOF
+		test-tool genzeros
+	} | test_copy_bytes $sz | test_must_fail git apply 2>err &&
+	grep "patch too large" err
+'
+
+test_done
diff --git a/t/t4150-am.sh b/t/t4150-am.sh
index 1da8ab1..5e2b6c8 100755
--- a/t/t4150-am.sh
+++ b/t/t4150-am.sh
@@ -2,6 +2,9 @@
 
 test_description='git am running'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 test_expect_success 'setup: messages' '
@@ -100,7 +103,7 @@ test_expect_success setup '
 
 	git format-patch --stdout first >patch1 &&
 	{
-		echo "Message-Id: <1226501681-24923-1-git-send-email-bda@mnsspb.ru>" &&
+		echo "Message-ID: <1226501681-24923-1-git-send-email-bda@mnsspb.ru>" &&
 		echo "X-Fake-Field: Line One" &&
 		echo "X-Fake-Field: Line Two" &&
 		echo "X-Fake-Field: Line Three" &&
@@ -113,7 +116,7 @@ test_expect_success setup '
 		git format-patch --stdout first | sed -e "1d"
 	} | append_cr >patch1-crlf.eml &&
 	{
-		printf "%255s\\n" ""
+		printf "%255s\\n" "" &&
 		echo "X-Fake-Field: Line One" &&
 		echo "X-Fake-Field: Line Two" &&
 		echo "X-Fake-Field: Line Three" &&
@@ -179,8 +182,8 @@ test_expect_success setup '
 	test_tick &&
 	git commit -m "added another file" &&
 
-	git format-patch --stdout master >lorem-move.patch &&
-	git format-patch --no-prefix --stdout master >lorem-zero.patch &&
+	git format-patch --stdout main >lorem-move.patch &&
+	git format-patch --no-prefix --stdout main >lorem-zero.patch &&
 
 	git checkout -b rename &&
 	git mv file renamed &&
@@ -193,6 +196,12 @@ test_expect_success setup '
 
 	git format-patch -M --stdout lorem^ >rename-add.patch &&
 
+	git checkout -b empty-commit &&
+	git commit -m "empty commit" --allow-empty &&
+
+	: >empty.patch &&
+	git format-patch --always --stdout empty-commit^ >empty-commit.patch &&
+
 	# reset time
 	sane_unset test_tick &&
 	test_tick
@@ -306,12 +315,10 @@ test_expect_success 'am --patch-format=hg applies hg patch' '
 '
 
 test_expect_success 'am with applypatch-msg hook' '
-	test_when_finished "rm -f .git/hooks/applypatch-msg" &&
 	rm -fr .git/rebase-apply &&
 	git reset --hard &&
 	git checkout first &&
-	mkdir -p .git/hooks &&
-	write_script .git/hooks/applypatch-msg <<-\EOF &&
+	test_hook applypatch-msg <<-\EOF &&
 	cat "$1" >actual-msg &&
 	echo hook-message >"$1"
 	EOF
@@ -326,12 +333,10 @@ test_expect_success 'am with applypatch-msg hook' '
 '
 
 test_expect_success 'am with failing applypatch-msg hook' '
-	test_when_finished "rm -f .git/hooks/applypatch-msg" &&
 	rm -fr .git/rebase-apply &&
 	git reset --hard &&
 	git checkout first &&
-	mkdir -p .git/hooks &&
-	write_script .git/hooks/applypatch-msg <<-\EOF &&
+	test_hook applypatch-msg <<-\EOF &&
 	exit 1
 	EOF
 	test_must_fail git am patch1 &&
@@ -340,13 +345,26 @@ test_expect_success 'am with failing applypatch-msg hook' '
 	test_cmp_rev first HEAD
 '
 
+test_expect_success 'am with failing applypatch-msg hook (no verify)' '
+	rm -fr .git/rebase-apply &&
+	git reset --hard &&
+	git checkout first &&
+	test_hook applypatch-msg <<-\EOF &&
+	echo hook-message >"$1"
+	exit 1
+	EOF
+	git am --no-verify patch1 &&
+	test_path_is_missing .git/rebase-apply &&
+	git diff --exit-code second &&
+	git log -1 --format=format:%B >actual &&
+	test_cmp msg actual
+'
+
 test_expect_success 'am with pre-applypatch hook' '
-	test_when_finished "rm -f .git/hooks/pre-applypatch" &&
 	rm -fr .git/rebase-apply &&
 	git reset --hard &&
 	git checkout first &&
-	mkdir -p .git/hooks &&
-	write_script .git/hooks/pre-applypatch <<-\EOF &&
+	test_hook pre-applypatch <<-\EOF &&
 	git diff first >diff.actual
 	exit 0
 	EOF
@@ -359,12 +377,10 @@ test_expect_success 'am with pre-applypatch hook' '
 '
 
 test_expect_success 'am with failing pre-applypatch hook' '
-	test_when_finished "rm -f .git/hooks/pre-applypatch" &&
 	rm -fr .git/rebase-apply &&
 	git reset --hard &&
 	git checkout first &&
-	mkdir -p .git/hooks &&
-	write_script .git/hooks/pre-applypatch <<-\EOF &&
+	test_hook pre-applypatch <<-\EOF &&
 	exit 1
 	EOF
 	test_must_fail git am patch1 &&
@@ -373,13 +389,28 @@ test_expect_success 'am with failing pre-applypatch hook' '
 	test_cmp_rev first HEAD
 '
 
+test_expect_success 'am with failing pre-applypatch hook (no verify)' '
+	rm -fr .git/rebase-apply &&
+	git reset --hard &&
+	git checkout first &&
+	touch empty-file &&
+	test_hook pre-applypatch <<-\EOF &&
+	rm empty-file
+	exit 1
+	EOF
+	git am --no-verify patch1 &&
+	test_path_is_missing .git/rebase-apply &&
+	test_path_is_file empty-file &&
+	git diff --exit-code second &&
+	git log -1 --format=format:%B >actual &&
+	test_cmp msg actual
+'
+
 test_expect_success 'am with post-applypatch hook' '
-	test_when_finished "rm -f .git/hooks/post-applypatch" &&
 	rm -fr .git/rebase-apply &&
 	git reset --hard &&
 	git checkout first &&
-	mkdir -p .git/hooks &&
-	write_script .git/hooks/post-applypatch <<-\EOF &&
+	test_hook post-applypatch <<-\EOF &&
 	git rev-parse HEAD >head.actual
 	git diff second >diff.actual
 	exit 0
@@ -394,12 +425,10 @@ test_expect_success 'am with post-applypatch hook' '
 '
 
 test_expect_success 'am with failing post-applypatch hook' '
-	test_when_finished "rm -f .git/hooks/post-applypatch" &&
 	rm -fr .git/rebase-apply &&
 	git reset --hard &&
 	git checkout first &&
-	mkdir -p .git/hooks &&
-	write_script .git/hooks/post-applypatch <<-\EOF &&
+	test_hook post-applypatch <<-\EOF &&
 	git rev-parse HEAD >head.actual
 	exit 1
 	EOF
@@ -453,11 +482,11 @@ test_expect_success 'am changes committer and keeps author' '
 	git checkout first &&
 	git am patch2 &&
 	test_path_is_missing .git/rebase-apply &&
-	test "$(git rev-parse master^^)" = "$(git rev-parse HEAD^^)" &&
-	git diff --exit-code master..HEAD &&
-	git diff --exit-code master^..HEAD^ &&
-	compare author master HEAD &&
-	compare author master^ HEAD^ &&
+	test "$(git rev-parse main^^)" = "$(git rev-parse HEAD^^)" &&
+	git diff --exit-code main..HEAD &&
+	git diff --exit-code main^..HEAD^ &&
+	compare author main HEAD &&
+	compare author main^ HEAD^ &&
 	test "$GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL>" = \
 	     "$(git log -1 --pretty=format:"%cn <%ce>" HEAD)"
 '
@@ -465,7 +494,7 @@ test_expect_success 'am changes committer and keeps author' '
 test_expect_success 'am --signoff adds Signed-off-by: line' '
 	rm -fr .git/rebase-apply &&
 	git reset --hard &&
-	git checkout -b master2 first &&
+	git checkout -b topic_2 first &&
 	git am --signoff <patch2 &&
 	{
 		printf "third\n\nSigned-off-by: %s <%s>\n\n" \
@@ -479,7 +508,7 @@ test_expect_success 'am --signoff adds Signed-off-by: line' '
 '
 
 test_expect_success 'am stays in branch' '
-	echo refs/heads/master2 >expected &&
+	echo refs/heads/topic_2 >expected &&
 	git symbolic-ref HEAD >actual &&
 	test_cmp expected actual
 '
@@ -540,7 +569,7 @@ test_expect_success 'am without --keep removes Re: and [PATCH] stuff' '
 	git reset --hard HEAD^ &&
 	git am <patch4 &&
 	git rev-parse HEAD >expected &&
-	git rev-parse master2 >actual &&
+	git rev-parse topic_2 >actual &&
 	test_cmp expected actual
 '
 
@@ -567,7 +596,7 @@ test_expect_success 'am --keep-non-patch really keeps the non-patch part' '
 test_expect_success 'setup am -3' '
 	rm -fr .git/rebase-apply &&
 	git reset --hard &&
-	git checkout -b base3way master2 &&
+	git checkout -b base3way topic_2 &&
 	sed -n -e "3,\$p" msg >file &&
 	head -n 9 msg >>file &&
 	git add file &&
@@ -750,7 +779,7 @@ test_expect_success 'am --resolved fails if index has unmerged entries' '
 	test_must_fail git am --resolved >err &&
 	test_path_is_dir .git/rebase-apply &&
 	test_cmp_rev second HEAD &&
-	test_i18ngrep "still have unmerged paths" err
+	test_grep "still have unmerged paths" err
 '
 
 test_expect_success 'am takes patches from a Pine mailbox' '
@@ -759,7 +788,7 @@ test_expect_success 'am takes patches from a Pine mailbox' '
 	git checkout first &&
 	cat pine patch1 | git am &&
 	test_path_is_missing .git/rebase-apply &&
-	git diff --exit-code master^..HEAD
+	git diff --exit-code main^..HEAD
 '
 
 test_expect_success 'am fails on mail without patch' '
@@ -884,7 +913,7 @@ test_expect_success 'am newline in subject' '
 	test_tick &&
 	sed -e "s/second/second \\\n foo/" patch1 >patchnl &&
 	git am <patchnl >output.out 2>&1 &&
-	test_i18ngrep "^Applying: second \\\n foo$" output.out
+	test_grep "^Applying: second \\\n foo$" output.out
 '
 
 test_expect_success 'am -q is quiet' '
@@ -903,7 +932,7 @@ test_expect_success 'am empty-file does not infloop' '
 	test_tick &&
 	test_must_fail git am empty-file 2>actual &&
 	echo Patch format detection failed. >expected &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 test_expect_success 'am --message-id really adds the message id' '
@@ -913,7 +942,7 @@ test_expect_success 'am --message-id really adds the message id' '
 	git am --message-id patch1.eml &&
 	test_path_is_missing .git/rebase-apply &&
 	git cat-file commit HEAD | tail -n1 >actual &&
-	grep Message-Id patch1.eml >expected &&
+	grep Message-ID patch1.eml >expected &&
 	test_cmp expected actual
 '
 
@@ -925,7 +954,7 @@ test_expect_success 'am.messageid really adds the message id' '
 	git am patch1.eml &&
 	test_path_is_missing .git/rebase-apply &&
 	git cat-file commit HEAD | tail -n1 >actual &&
-	grep Message-Id patch1.eml >expected &&
+	grep Message-ID patch1.eml >expected &&
 	test_cmp expected actual
 '
 
@@ -936,7 +965,7 @@ test_expect_success 'am --message-id -s signs off after the message id' '
 	git am -s --message-id patch1.eml &&
 	test_path_is_missing .git/rebase-apply &&
 	git cat-file commit HEAD | tail -n2 | head -n1 >actual &&
-	grep Message-Id patch1.eml >expected &&
+	grep Message-ID patch1.eml >expected &&
 	test_cmp expected actual
 '
 
@@ -1036,7 +1065,7 @@ test_expect_success 'am --patch-format=mboxrd handles mboxrd' '
 	>From extra escape for reversibility
 	INPUT_END
 	git commit -F msg &&
-	git format-patch --pretty=mboxrd --stdout -1 >mboxrd1 &&
+	git -c format.mboxrd format-patch --stdout -1 >mboxrd1 &&
 	grep "^>From could trip up a loose mbox parser" mboxrd1 &&
 	git checkout -f first &&
 	git am --patch-format=mboxrd mboxrd1 &&
@@ -1112,21 +1141,21 @@ test_expect_success 'am and .gitattibutes' '
 		test_commit sixth &&
 
 		git checkout test &&
-		git format-patch --stdout master..HEAD >patches &&
-		git reset --hard master &&
+		git format-patch --stdout main..HEAD >patches &&
+		git reset --hard main &&
 		git am patches &&
 		grep "smudged" a.txt &&
 
 		git checkout removal &&
 		git reset --hard &&
-		git format-patch --stdout master..HEAD >patches &&
-		git reset --hard master &&
+		git format-patch --stdout main..HEAD >patches &&
+		git reset --hard main &&
 		git am patches &&
 		grep "clean" a.txt &&
 
 		git checkout conflict &&
 		git reset --hard &&
-		git format-patch --stdout master..HEAD >patches &&
+		git format-patch --stdout main..HEAD >patches &&
 		git reset --hard fourth &&
 		test_must_fail git am -3 patches &&
 		grep "<<<<<<<<<<" a.txt
@@ -1149,4 +1178,105 @@ test_expect_success 'apply binary blob in partial clone' '
 	git -C client am ../patch
 '
 
+test_expect_success 'an empty input file is error regardless of --empty option' '
+	test_when_finished "git am --abort || :" &&
+	test_must_fail git am --empty=drop empty.patch 2>actual &&
+	echo "Patch format detection failed." >expected &&
+	test_cmp expected actual
+'
+
+test_expect_success 'invalid when passing the --empty option alone' '
+	test_when_finished "git am --abort || :" &&
+	git checkout empty-commit^ &&
+	test_must_fail git am --empty empty-commit.patch 2>err &&
+	echo "error: invalid value for '\''--empty'\'': '\''empty-commit.patch'\''" >expected &&
+	test_cmp expected err
+'
+
+test_expect_success 'a message without a patch is an error (default)' '
+	test_when_finished "git am --abort || :" &&
+	test_must_fail git am empty-commit.patch >err &&
+	grep "Patch is empty" err
+'
+
+test_expect_success 'a message without a patch is an error where an explicit "--empty=stop" is given' '
+	test_when_finished "git am --abort || :" &&
+	test_must_fail git am --empty=stop empty-commit.patch >err &&
+	grep "Patch is empty." err
+'
+
+test_expect_success 'a message without a patch will be skipped when "--empty=drop" is given' '
+	git am --empty=drop empty-commit.patch >output &&
+	git rev-parse empty-commit^ >expected &&
+	git rev-parse HEAD >actual &&
+	test_cmp expected actual &&
+	grep "Skipping: empty commit" output
+'
+
+test_expect_success 'record as an empty commit when meeting e-mail message that lacks a patch' '
+	git am --empty=keep empty-commit.patch >output &&
+	test_path_is_missing .git/rebase-apply &&
+	git show empty-commit --format="%B" >expected &&
+	git show HEAD --format="%B" >actual &&
+	grep -f actual expected &&
+	grep "Creating an empty commit: empty commit" output
+'
+
+test_expect_success 'skip an empty patch in the middle of an am session' '
+	git checkout empty-commit^ &&
+	test_must_fail git am empty-commit.patch >out 2>err &&
+	grep "Patch is empty." out &&
+	grep "To record the empty patch as an empty commit, run \"git am --allow-empty\"." err &&
+	git am --skip &&
+	test_path_is_missing .git/rebase-apply &&
+	git rev-parse empty-commit^ >expected &&
+	git rev-parse HEAD >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'record an empty patch as an empty commit in the middle of an am session' '
+	git checkout empty-commit^ &&
+	test_must_fail git am empty-commit.patch >out 2>err &&
+	grep "Patch is empty." out &&
+	grep "To record the empty patch as an empty commit, run \"git am --allow-empty\"." err &&
+	git am --allow-empty >output &&
+	grep "No changes - recorded it as an empty commit." output &&
+	test_path_is_missing .git/rebase-apply &&
+	git show empty-commit --format="%B" >expected &&
+	git show HEAD --format="%B" >actual &&
+	grep -f actual expected
+'
+
+test_expect_success 'create an non-empty commit when the index IS changed though "--allow-empty" is given' '
+	git checkout empty-commit^ &&
+	test_must_fail git am empty-commit.patch >err &&
+	: >empty-file &&
+	git add empty-file &&
+	git am --allow-empty &&
+	git show empty-commit --format="%B" >expected &&
+	git show HEAD --format="%B" >actual &&
+	grep -f actual expected &&
+	git diff HEAD^..HEAD --name-only
+'
+
+test_expect_success 'cannot create empty commits when there is a clean index due to merge conflicts' '
+	test_when_finished "git am --abort || :" &&
+	git rev-parse HEAD >expected &&
+	test_must_fail git am seq.patch &&
+	test_must_fail git am --allow-empty >err &&
+	! grep "To record the empty patch as an empty commit, run \"git am --allow-empty\"." err &&
+	git rev-parse HEAD >actual &&
+	test_cmp actual expected
+'
+
+test_expect_success 'cannot create empty commits when there is unmerged index due to merge conflicts' '
+	test_when_finished "git am --abort || :" &&
+	git rev-parse HEAD >expected &&
+	test_must_fail git am -3 seq.patch &&
+	test_must_fail git am --allow-empty >err &&
+	! grep "To record the empty patch as an empty commit, run \"git am --allow-empty\"." err &&
+	git rev-parse HEAD >actual &&
+	test_cmp actual expected
+'
+
 test_done
diff --git a/t/t4151-am-abort.sh b/t/t4151-am-abort.sh
index 9d8d3c7..edb38da 100755
--- a/t/t4151-am-abort.sh
+++ b/t/t4151-am-abort.sh
@@ -5,10 +5,7 @@ test_description='am --abort'
 . ./test-lib.sh
 
 test_expect_success setup '
-	for i in a b c d e f g
-	do
-		echo $i
-	done >file-1 &&
+	test_write_lines a b c d e f g >file-1 &&
 	cp file-1 file-2 &&
 	test_tick &&
 	git add file-1 file-2 &&
@@ -23,7 +20,13 @@ test_expect_success setup '
 		test_tick &&
 		git commit -a -m $i || return 1
 	done &&
+	git branch changes &&
 	git format-patch --no-numbered initial &&
+	git checkout -b conflicting initial &&
+	echo different >>file-1 &&
+	echo whatever >new-file &&
+	git add file-1 new-file &&
+	git commit -m different &&
 	git checkout -b side initial &&
 	echo local change >file-2-expect
 '
@@ -37,16 +40,13 @@ do
 
 		test_must_fail git am$with3 000[1245]-*.patch &&
 		git log --pretty=tformat:%s >actual &&
-		for i in 3 2 initial
-		do
-			echo $i
-		done >expect &&
+		test_write_lines 3 2 initial >expect &&
 		test_cmp expect actual
 	'
 
 	test_expect_success "am$with3 --skip continue after failed am$with3" '
 		test_must_fail git am$with3 --skip >output &&
-		test_i18ngrep "^Applying: 6$" output &&
+		test_grep "^Applying: 6$" output &&
 		test_cmp file-2-expect file-2 &&
 		test ! -f .git/MERGE_RR
 	'
@@ -191,4 +191,37 @@ test_expect_success 'am --abort leaves index stat info alone' '
 	git diff-files --exit-code --quiet
 '
 
+test_expect_success 'git am --abort return failed exit status when it fails' '
+	test_when_finished "rm -rf file-2/ && git reset --hard && git am --abort" &&
+	git checkout changes &&
+	git format-patch -1 --stdout conflicting >changes.mbox &&
+	test_must_fail git am --3way changes.mbox &&
+
+	git rm file-2 &&
+	mkdir file-2 &&
+	echo precious >file-2/somefile &&
+	test_must_fail git am --abort &&
+	test_path_is_dir file-2/
+'
+
+test_expect_success 'git am --abort cleans relevant files' '
+	git checkout changes &&
+	git format-patch -1 --stdout conflicting >changes.mbox &&
+	test_must_fail git am --3way changes.mbox &&
+
+	test_path_is_file new-file &&
+	echo further changes >>file-1 &&
+	echo change other file >>file-2 &&
+
+	# Abort, and expect the files touched by am to be reverted
+	git am --abort &&
+
+	test_path_is_missing new-file &&
+
+	# Files not involved in am operation are left modified
+	git diff --name-only changes >actual &&
+	test_write_lines file-2 >expect &&
+	test_cmp expect actual
+'
+
 test_done
diff --git a/t/t4152-am-subjects.sh b/t/t4152-am-subjects.sh
index 4c68245..9f2edba 100755
--- a/t/t4152-am-subjects.sh
+++ b/t/t4152-am-subjects.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='test subject preservation with format-patch | am'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 make_patches() {
diff --git a/t/t4153-am-resume-override-opts.sh b/t/t4153-am-resume-override-opts.sh
index 8ea22d1..4add7c7 100755
--- a/t/t4153-am-resume-override-opts.sh
+++ b/t/t4153-am-resume-override-opts.sh
@@ -53,7 +53,7 @@ test_expect_success '--no-quiet overrides --quiet' '
 	# Applying side1 will be quiet.
 	test_must_fail git am --quiet side[123].eml >out &&
 	test_path_is_dir .git/rebase-apply &&
-	test_i18ngrep ! "^Applying: " out &&
+	test_grep ! "^Applying: " out &&
 	echo side1 >file &&
 	git add file &&
 
@@ -61,7 +61,7 @@ test_expect_success '--no-quiet overrides --quiet' '
 	# Applying side2 will be quiet.
 	git am --no-quiet --continue >out &&
 	echo "Applying: side1" >expected &&
-	test_i18ncmp expected out
+	test_cmp expected out
 '
 
 test_expect_success '--signoff overrides --no-signoff' '
diff --git a/t/t4200-rerere.sh b/t/t4200-rerere.sh
index b12b43e..fb53ddd 100755
--- a/t/t4200-rerere.sh
+++ b/t/t4200-rerere.sh
@@ -8,7 +8,7 @@ test_description='git rerere
 ! [fifth] version1
  ! [first] first
   ! [fourth] version1
-   ! [master] initial
+   ! [main] initial
     ! [second] prefer first over second
      ! [third] version2
 ------
@@ -19,9 +19,12 @@ test_description='git rerere
     -  [second] prefer first over second
  +  +  [first] first
     +  [second^] second
-++++++ [master] initial
+++++++ [main] initial
 '
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -57,7 +60,7 @@ test_expect_success 'setup' '
 	test_tick &&
 	git commit -q -a -m first &&
 
-	git checkout -b second master &&
+	git checkout -b second main &&
 	git show first:a1 |
 	sed -e "s/To die, t/To die! T/" -e "s/Some title/Some Title/" >a1 &&
 	echo "* END *" >>a1 &&
@@ -168,7 +171,7 @@ test_expect_success 'first postimage wins' '
 
 	oldmtimepost=$(test-tool chmtime --get -60 $rr/postimage) &&
 
-	git checkout -b third master &&
+	git checkout -b third main &&
 	git show second^:a1 | sed "s/To die: t/To die! T/" >a1 &&
 	git commit -q -a -m third &&
 
@@ -362,9 +365,6 @@ test_expect_success 'set up an unresolved merge' '
 	test_might_fail git config --unset rerere.autoupdate &&
 	git reset --hard &&
 	git checkout version2 &&
-	fifth=$(git rev-parse fifth) &&
-	echo "$fifth		branch fifth of ." |
-	git fmt-merge-msg >msg &&
 	ancestor=$(git merge-base version2 fifth) &&
 	test_must_fail git merge-recursive "$ancestor" -- HEAD fifth &&
 
@@ -433,13 +433,13 @@ test_expect_success 'rerere --no-no-rerere-autoupdate' '
 	git update-index --index-info <failedmerge &&
 	cp file3.conflict file3 &&
 	test_must_fail git rerere --no-no-rerere-autoupdate 2>err &&
-	test_i18ngrep [Uu]sage err &&
+	test_grep [Uu]sage err &&
 	test_must_fail git update-index --refresh
 '
 
 test_expect_success 'rerere -h' '
 	test_must_fail git rerere -h >help &&
-	test_i18ngrep [Uu]sage help
+	test_grep [Uu]sage help
 '
 
 concat_insert () {
@@ -580,13 +580,13 @@ test_expect_success 'multiple identical conflicts' '
 test_expect_success 'rerere with unexpected conflict markers does not crash' '
 	git reset --hard &&
 
-	git checkout -b branch-1 master &&
+	git checkout -b branch-1 main &&
 	echo "bar" >test &&
 	git add test &&
 	git commit -q -m two &&
 
 	git reset --hard &&
-	git checkout -b branch-2 master &&
+	git checkout -b branch-2 main &&
 	echo "foo" >test &&
 	git add test &&
 	git commit -q -a -m one &&
@@ -601,7 +601,7 @@ test_expect_success 'rerere with unexpected conflict markers does not crash' '
 test_expect_success 'rerere with inner conflict markers' '
 	git reset --hard &&
 
-	git checkout -b A master &&
+	git checkout -b A main &&
 	echo "bar" >test &&
 	git add test &&
 	git commit -q -m two &&
@@ -610,7 +610,7 @@ test_expect_success 'rerere with inner conflict markers' '
 	git commit -q -m three &&
 
 	git reset --hard &&
-	git checkout -b B master &&
+	git checkout -b B main &&
 	echo "foo" >test &&
 	git add test &&
 	git commit -q -a -m one &&
@@ -651,11 +651,11 @@ test_expect_success 'setup simple stage 1 handling' '
 		git add original &&
 		git commit -m original &&
 
-		git checkout -b A master &&
+		git checkout -b A main &&
 		git mv original A &&
 		git commit -m "rename to A" &&
 
-		git checkout -b B master &&
+		git checkout -b B main &&
 		git mv original B &&
 		git commit -m "rename to B"
 	)
diff --git a/t/t4201-shortlog.sh b/t/t4201-shortlog.sh
index d3a7ce6..f698d0c 100755
--- a/t/t4201-shortlog.sh
+++ b/t/t4201-shortlog.sh
@@ -6,6 +6,9 @@
 test_description='git shortlog
 '
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -80,6 +83,13 @@ test_expect_success 'pretty format' '
 	test_cmp expect log.predictable
 '
 
+test_expect_success 'pretty format (with --date)' '
+	sed "s/SUBJECT/2005-04-07 OBJECT_NAME/" expect.template >expect &&
+	git shortlog --format="%ad %H" --date=short HEAD >log &&
+	fuzz log >log.predictable &&
+	test_cmp expect log.predictable
+'
+
 test_expect_success '--abbrev' '
 	sed s/SUBJECT/OBJID/ expect.template >expect &&
 	git shortlog --format="%h" --abbrev=35 HEAD >log &&
@@ -129,7 +139,7 @@ test_expect_success !MINGW 'shortlog can read --format=raw output' '
 
 test_expect_success 'shortlog from non-git directory refuses extra arguments' '
 	test_must_fail env GIT_DIR=non-existing git shortlog foo 2>out &&
-	test_i18ngrep "too many arguments" out
+	test_grep "too many arguments" out
 '
 
 test_expect_success 'shortlog should add newline when input line matches wraplen' '
@@ -191,7 +201,7 @@ test_expect_success 'shortlog with revision pseudo options' '
 '
 
 test_expect_success 'shortlog with --output=<file>' '
-	git shortlog --output=shortlog -1 master >output &&
+	git shortlog --output=shortlog -1 main >output &&
 	test_must_be_empty output &&
 	test_line_count = 3 shortlog
 '
@@ -215,4 +225,209 @@ test_expect_success 'shortlog --committer (external)' '
 	test_cmp expect actual
 '
 
+test_expect_success '--group=committer is the same as --committer' '
+	git shortlog -ns --group=committer HEAD >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'shortlog --group=trailer:signed-off-by' '
+	git commit --allow-empty -m foo -s &&
+	GIT_COMMITTER_NAME="SOB One" \
+	GIT_COMMITTER_EMAIL=sob@example.com \
+		git commit --allow-empty -m foo -s &&
+	git commit --allow-empty --amend --no-edit -s &&
+	cat >expect <<-\EOF &&
+	     2	C O Mitter <committer@example.com>
+	     1	SOB One <sob@example.com>
+	EOF
+	git shortlog -nse --group=trailer:signed-off-by HEAD >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'shortlog --group=format' '
+	git shortlog -s --date="format:%Y" --group="format:%cN (%cd)" \
+		HEAD >actual &&
+	cat >expect <<-\EOF &&
+	     4	C O Mitter (2005)
+	     1	Sin Nombre (2005)
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'shortlog --group=<format> DWIM' '
+	git shortlog -s --date="format:%Y" --group="%cN (%cd)" HEAD >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'shortlog bogus --group' '
+	test_must_fail git shortlog --group=bogus HEAD 2>err &&
+	grep "unknown group type" err
+'
+
+test_expect_success 'trailer idents are split' '
+	cat >expect <<-\EOF &&
+	     2	C O Mitter
+	     1	SOB One
+	EOF
+	git shortlog -ns --group=trailer:signed-off-by HEAD >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'trailer idents are mailmapped' '
+	cat >expect <<-\EOF &&
+	     2	C O Mitter
+	     1	Another Name
+	EOF
+	echo "Another Name <sob@example.com>" >mail.map &&
+	git -c mailmap.file=mail.map shortlog -ns \
+		--group=trailer:signed-off-by HEAD >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'shortlog de-duplicates trailers in a single commit' '
+	git commit --allow-empty -F - <<-\EOF &&
+	subject one
+
+	this message has two distinct values, plus a repeat
+
+	Repeated-trailer: Foo
+	Repeated-trailer: Bar
+	Repeated-trailer: Foo
+	EOF
+
+	git commit --allow-empty -F - <<-\EOF &&
+	subject two
+
+	similar to the previous, but without the second distinct value
+
+	Repeated-trailer: Foo
+	Repeated-trailer: Foo
+	EOF
+
+	cat >expect <<-\EOF &&
+	     2	Foo
+	     1	Bar
+	EOF
+	git shortlog -ns --group=trailer:repeated-trailer -2 HEAD >actual &&
+	test_cmp expect actual
+'
+
+# Trailers that have unfolded (single line) and folded (multiline) values which
+# are otherwise identical are treated as the same trailer for de-duplication.
+test_expect_success 'shortlog de-duplicates trailers in a single commit (folded/unfolded values)' '
+	git commit --allow-empty -F - <<-\EOF &&
+	subject one
+
+	this message has two distinct values, plus a repeat (folded)
+
+	Repeated-trailer: Foo foo foo
+	Repeated-trailer: Bar
+	Repeated-trailer: Foo
+	  foo foo
+	EOF
+
+	git commit --allow-empty -F - <<-\EOF &&
+	subject two
+
+	similar to the previous, but without the second distinct value
+
+	Repeated-trailer: Foo foo foo
+	Repeated-trailer: Foo
+	  foo foo
+	EOF
+
+	cat >expect <<-\EOF &&
+	     2	Foo foo foo
+	     1	Bar
+	EOF
+	git shortlog -ns --group=trailer:repeated-trailer -2 HEAD >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'shortlog can match multiple groups' '
+	git commit --allow-empty -F - <<-\EOF &&
+	subject one
+
+	this has two trailers that are distinct from the author; it will count
+	3 times in the output
+
+	Some-trailer: User A <a@example.com>
+	Another-trailer: User B <b@example.com>
+	EOF
+
+	git commit --allow-empty -F - <<-\EOF &&
+	subject two
+
+	this one has two trailers, one of which is a duplicate with the author;
+	it will only be counted once for them
+
+	Another-trailer: A U Thor <author@example.com>
+	Some-trailer: User B <b@example.com>
+	EOF
+
+	cat >expect <<-\EOF &&
+	     2	A U Thor
+	     2	User B
+	     1	User A
+	EOF
+	git shortlog -ns \
+		--group=author \
+		--group=trailer:some-trailer \
+		--group=trailer:another-trailer \
+		-2 HEAD >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'shortlog can match multiple format groups' '
+	GIT_COMMITTER_NAME="$GIT_AUTHOR_NAME" \
+		git commit --allow-empty -m "identical names" &&
+	test_tick &&
+	cat >expect <<-\EOF &&
+	     2	A U Thor
+	     1	C O Mitter
+	EOF
+	git shortlog -ns --group="%cn" --group="%an" -2 HEAD >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'set up option selection tests' '
+	git commit --allow-empty -F - <<-\EOF
+	subject
+
+	body
+
+	Trailer-one: value-one
+	Trailer-two: value-two
+	EOF
+'
+
+test_expect_success '--no-group resets group list to author' '
+	cat >expect <<-\EOF &&
+	     1	A U Thor
+	EOF
+	git shortlog -ns \
+		--group=committer \
+		--group=trailer:trailer-one \
+		--no-group \
+		-1 HEAD >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success '--no-group resets trailer list' '
+	cat >expect <<-\EOF &&
+	     1	value-two
+	EOF
+	git shortlog -ns \
+		--group=trailer:trailer-one \
+		--no-group \
+		--group=trailer:trailer-two \
+		-1 HEAD >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'stdin with multiple groups reports error' '
+	git log >log &&
+	test_must_fail git shortlog --group=author --group=committer <log
+'
+
 test_done
diff --git a/t/t4202-log.sh b/t/t4202-log.sh
index a093059..60fe60d 100755
--- a/t/t4202-log.sh
+++ b/t/t4202-log.sh
@@ -2,6 +2,9 @@
 
 test_description='git log'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 . "$TEST_DIRECTORY/lib-gpg.sh"
 . "$TEST_DIRECTORY/lib-terminal.sh"
@@ -117,48 +120,61 @@ test_expect_success 'diff-filter=A' '
 
 test_expect_success 'diff-filter=M' '
 
-	actual=$(git log --pretty="format:%s" --diff-filter=M HEAD) &&
-	expect=$(echo second) &&
-	verbose test "$actual" = "$expect"
+	git log --pretty="format:%s" --diff-filter=M HEAD >actual &&
+	printf "second" >expect &&
+	test_cmp expect actual
 
 '
 
 test_expect_success 'diff-filter=D' '
 
-	actual=$(git log --no-renames --pretty="format:%s" --diff-filter=D HEAD) &&
-	expect=$(echo sixth ; echo third) &&
-	verbose test "$actual" = "$expect"
+	git log --no-renames --pretty="format:%s" --diff-filter=D HEAD >actual &&
+	printf "sixth\nthird" >expect &&
+	test_cmp expect actual
 
 '
 
 test_expect_success 'diff-filter=R' '
 
-	actual=$(git log -M --pretty="format:%s" --diff-filter=R HEAD) &&
-	expect=$(echo third) &&
-	verbose test "$actual" = "$expect"
+	git log -M --pretty="format:%s" --diff-filter=R HEAD >actual &&
+	printf "third" >expect &&
+	test_cmp expect actual
+
+'
+
+test_expect_success 'multiple --diff-filter bits' '
+
+	git log -M --pretty="format:%s" --diff-filter=R HEAD >expect &&
+	git log -M --pretty="format:%s" --diff-filter=Ra HEAD >actual &&
+	test_cmp expect actual &&
+	git log -M --pretty="format:%s" --diff-filter=aR HEAD >actual &&
+	test_cmp expect actual &&
+	git log -M --pretty="format:%s" \
+		--diff-filter=a --diff-filter=R HEAD >actual &&
+	test_cmp expect actual
 
 '
 
 test_expect_success 'diff-filter=C' '
 
-	actual=$(git log -C -C --pretty="format:%s" --diff-filter=C HEAD) &&
-	expect=$(echo fourth) &&
-	verbose test "$actual" = "$expect"
+	git log -C -C --pretty="format:%s" --diff-filter=C HEAD >actual &&
+	printf "fourth" >expect &&
+	test_cmp expect actual
 
 '
 
 test_expect_success 'git log --follow' '
 
-	actual=$(git log --follow --pretty="format:%s" ichi) &&
-	expect=$(echo third ; echo second ; echo initial) &&
-	verbose test "$actual" = "$expect"
+	git log --follow --pretty="format:%s" ichi >actual &&
+	printf "third\nsecond\ninitial" >expect &&
+	test_cmp expect actual
 '
 
 test_expect_success 'git config log.follow works like --follow' '
 	test_config log.follow true &&
-	actual=$(git log --pretty="format:%s" ichi) &&
-	expect=$(echo third ; echo second ; echo initial) &&
-	verbose test "$actual" = "$expect"
+	git log --pretty="format:%s" ichi >actual &&
+	printf "third\nsecond\ninitial" >expect &&
+	test_cmp expect actual
 '
 
 test_expect_success 'git config log.follow does not die with multiple paths' '
@@ -171,11 +187,26 @@ test_expect_success 'git config log.follow does not die with no paths' '
 	git log --
 '
 
+test_expect_success 'git log --follow rejects unsupported pathspec magic' '
+	test_must_fail git log --follow ":(top,glob,icase)ichi" 2>stderr &&
+	# check full error message; we want to be sure we mention both
+	# of the rejected types (glob,icase), but not the allowed one (top)
+	echo "fatal: pathspec magic not supported by --follow: ${SQ}glob${SQ}, ${SQ}icase${SQ}" >expect &&
+	test_cmp expect stderr
+'
+
+test_expect_success 'log.follow disabled with unsupported pathspec magic' '
+	test_config log.follow true &&
+	git log --format=%s ":(glob,icase)ichi" >actual &&
+	echo third >expect &&
+	test_cmp expect actual
+'
+
 test_expect_success 'git config log.follow is overridden by --no-follow' '
 	test_config log.follow true &&
-	actual=$(git log --no-follow --pretty="format:%s" ichi) &&
-	expect="third" &&
-	verbose test "$actual" = "$expect"
+	git log --no-follow --pretty="format:%s" ichi >actual &&
+	printf "third" >expect &&
+	test_cmp expect actual
 '
 
 # Note that these commits are intentionally listed out of order.
@@ -233,6 +264,15 @@ test_expect_success 'log --grep' '
 	test_cmp expect actual
 '
 
+for noop_opt in --invert-grep --all-match
+do
+	test_expect_success "log $noop_opt without --grep is a NOOP" '
+		git log >expect &&
+		git log $noop_opt >actual &&
+		test_cmp expect actual
+	'
+done
+
 cat > expect << EOF
 second
 initial
@@ -247,7 +287,7 @@ test_expect_success 'log --invert-grep --grep' '
 	test_cmp expect actual &&
 
 	# POSIX extended
-	git -c grep.patternType=basic log --pretty="tformat:%s" --invert-grep --grep=t[h] --grep=S[e]c >actual &&
+	git -c grep.patternType=extended log --pretty="tformat:%s" --invert-grep --grep=t[h] --grep=S[e]c >actual &&
 	test_cmp expect actual &&
 
 	# PCRE
@@ -446,6 +486,80 @@ test_expect_success !FAIL_PREREQS 'log with various grep.patternType configurati
 	)
 '
 
+for cmd in show whatchanged reflog format-patch
+do
+	case "$cmd" in
+	format-patch) myarg="HEAD~.." ;;
+	*) myarg= ;;
+	esac
+
+	test_expect_success "$cmd: understands grep.patternType, like 'log'" '
+		git init "pattern-type-$cmd" &&
+		(
+			cd "pattern-type-$cmd" &&
+			test_commit 1 file A &&
+			test_commit "(1|2)" file B 2 &&
+
+			git -c grep.patternType=fixed $cmd --grep="..." $myarg >actual &&
+			test_must_be_empty actual &&
+
+			git -c grep.patternType=basic $cmd --grep="..." $myarg >actual &&
+			test_file_not_empty actual
+		)
+	'
+done
+
+test_expect_success 'log --author' '
+	cat >expect <<-\EOF &&
+	Author: <BOLD;RED>A U<RESET> Thor <author@example.com>
+	EOF
+	git log -1 --color=always --author="A U" >log &&
+	grep Author log >actual.raw &&
+	test_decode_color <actual.raw >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'log --committer' '
+	cat >expect <<-\EOF &&
+	Commit:     C O Mitter <committer@<BOLD;RED>example<RESET>.com>
+	EOF
+	git log -1 --color=always --pretty=fuller --committer="example" >log &&
+	grep "Commit:" log >actual.raw &&
+	test_decode_color <actual.raw >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'log -i --grep with color' '
+	cat >expect <<-\EOF &&
+	    <BOLD;RED>Sec<RESET>ond
+	    <BOLD;RED>sec<RESET>ond
+	EOF
+	git log --color=always -i --grep=^sec >log &&
+	grep -i sec log >actual.raw &&
+	test_decode_color <actual.raw >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success '-c color.grep.selected log --grep' '
+	cat >expect <<-\EOF &&
+	    <GREEN>th<RESET><BOLD;RED>ir<RESET><GREEN>d<RESET>
+	EOF
+	git -c color.grep.selected="green" log --color=always --grep=ir >log &&
+	grep ir log >actual.raw &&
+	test_decode_color <actual.raw >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success '-c color.grep.matchSelected log --grep' '
+	cat >expect <<-\EOF &&
+	    <BLUE>i<RESET>n<BLUE>i<RESET>t<BLUE>i<RESET>al
+	EOF
+	git -c color.grep.matchSelected="blue" log --color=always --grep=i >log &&
+	grep al log >actual.raw &&
+	test_decode_color <actual.raw >actual &&
+	test_cmp expect actual
+'
+
 cat > expect <<EOF
 * Second
 * sixth
@@ -478,7 +592,7 @@ test_expect_success 'set up merge history' '
 	git checkout -b side HEAD~4 &&
 	test_commit side-1 1 1 &&
 	test_commit side-2 2 2 &&
-	git checkout master &&
+	git checkout main &&
 	git merge side
 '
 
@@ -541,17 +655,17 @@ test_expect_success 'log --graph with merge with log.graphColors' '
 '
 
 test_expect_success 'log --raw --graph -m with merge' '
-	git log --raw --graph --oneline -m master | head -n 500 >actual &&
+	git log --raw --graph --oneline -m main | head -n 500 >actual &&
 	grep "initial" actual
 '
 
 test_expect_success 'diff-tree --graph' '
-	git diff-tree --graph master^ | head -n 500 >actual &&
+	git diff-tree --graph main^ | head -n 500 >actual &&
 	grep "one" actual
 '
 
 cat > expect <<\EOF
-*   commit master
+*   commit main
 |\  Merge: A B
 | | Author: A U Thor <author@example.com>
 | |
@@ -567,22 +681,22 @@ cat > expect <<\EOF
 | |
 | |     side-1
 | |
-* | commit master~1
+* | commit main~1
 | | Author: A U Thor <author@example.com>
 | |
 | |     Second
 | |
-* | commit master~2
+* | commit main~2
 | | Author: A U Thor <author@example.com>
 | |
 | |     sixth
 | |
-* | commit master~3
+* | commit main~3
 | | Author: A U Thor <author@example.com>
 | |
 | |     fifth
 | |
-* | commit master~4
+* | commit main~4
 |/  Author: A U Thor <author@example.com>
 |
 |       fourth
@@ -605,7 +719,7 @@ EOF
 
 test_expect_success 'log --graph with full output' '
 	git log --graph --date-order --pretty=short |
-		git name-rev --name-only --stdin |
+		git name-rev --name-only --annotate-stdin |
 		sed "s/Merge:.*/Merge: A B/;s/ *\$//" >actual &&
 	test_cmp expect actual
 '
@@ -613,19 +727,22 @@ test_expect_success 'log --graph with full output' '
 test_expect_success 'set up more tangled history' '
 	git checkout -b tangle HEAD~6 &&
 	test_commit tangle-a tangle-a a &&
-	git merge master~3 &&
+	git merge main~3 &&
+	git update-ref refs/prefetch/merge HEAD &&
 	git merge side~1 &&
-	git checkout master &&
+	git update-ref refs/rewritten/merge HEAD &&
+	git checkout main &&
 	git merge tangle &&
+	git update-ref refs/hidden/tangle HEAD &&
 	git checkout -b reach &&
 	test_commit reach &&
-	git checkout master &&
+	git checkout main &&
 	git checkout -b octopus-a &&
 	test_commit octopus-a &&
-	git checkout master &&
+	git checkout main &&
 	git checkout -b octopus-b &&
 	test_commit octopus-b &&
-	git checkout master &&
+	git checkout main &&
 	test_commit seventh &&
 	git merge octopus-a octopus-b &&
 	git merge reach
@@ -650,7 +767,7 @@ cat > expect <<\EOF
 |\
 | *   Merge branch 'side' (early part) into tangle
 | |\
-| * \   Merge branch 'master' (early part) into tangle
+| * \   Merge branch 'main' (early part) into tangle
 | |\ \
 | * | | tangle-a
 * | | |   Merge branch 'side'
@@ -733,6 +850,21 @@ test_expect_success 'log.decorate configuration' '
 
 '
 
+test_expect_success 'parse log.excludeDecoration with no value' '
+	cp .git/config .git/config.orig &&
+	test_when_finished mv .git/config.orig .git/config &&
+
+	cat >>.git/config <<-\EOF &&
+	[log]
+		excludeDecoration
+	EOF
+	cat >expect <<-\EOF &&
+	error: missing value for '\''log.excludeDecoration'\''
+	EOF
+	git log --decorate=short 2>actual &&
+	test_cmp expect actual
+'
+
 test_expect_success 'decorate-refs with glob' '
 	cat >expect.decorate <<-\EOF &&
 	Merge-tag-reach
@@ -794,7 +926,7 @@ test_expect_success 'multiple decorate-refs' '
 
 test_expect_success 'decorate-refs-exclude with glob' '
 	cat >expect.decorate <<-\EOF &&
-	Merge-tag-reach (HEAD -> master)
+	Merge-tag-reach (HEAD -> main)
 	Merge-tags-octopus-a-and-octopus-b
 	seventh (tag: seventh)
 	octopus-b (tag: octopus-b)
@@ -811,7 +943,7 @@ test_expect_success 'decorate-refs-exclude with glob' '
 
 test_expect_success 'decorate-refs-exclude without globs' '
 	cat >expect.decorate <<-\EOF &&
-	Merge-tag-reach (HEAD -> master)
+	Merge-tag-reach (HEAD -> main)
 	Merge-tags-octopus-a-and-octopus-b
 	seventh (tag: seventh)
 	octopus-b (tag: octopus-b, octopus-b)
@@ -828,7 +960,7 @@ test_expect_success 'decorate-refs-exclude without globs' '
 
 test_expect_success 'multiple decorate-refs-exclude' '
 	cat >expect.decorate <<-\EOF &&
-	Merge-tag-reach (HEAD -> master)
+	Merge-tag-reach (HEAD -> main)
 	Merge-tags-octopus-a-and-octopus-b
 	seventh (tag: seventh)
 	octopus-b (tag: octopus-b)
@@ -851,7 +983,7 @@ test_expect_success 'multiple decorate-refs-exclude' '
 
 test_expect_success 'decorate-refs and decorate-refs-exclude' '
 	cat >expect.no-decorate <<-\EOF &&
-	Merge-tag-reach (master)
+	Merge-tag-reach (main)
 	Merge-tags-octopus-a-and-octopus-b
 	seventh
 	octopus-b
@@ -866,7 +998,7 @@ test_expect_success 'decorate-refs and decorate-refs-exclude' '
 
 test_expect_success 'deocrate-refs and log.excludeDecoration' '
 	cat >expect.decorate <<-\EOF &&
-	Merge-tag-reach (master)
+	Merge-tag-reach (main)
 	Merge-tags-octopus-a-and-octopus-b
 	seventh
 	octopus-b (octopus-b)
@@ -881,12 +1013,12 @@ test_expect_success 'deocrate-refs and log.excludeDecoration' '
 
 test_expect_success 'decorate-refs-exclude and simplify-by-decoration' '
 	cat >expect.decorate <<-\EOF &&
-	Merge-tag-reach (HEAD -> master)
+	Merge-tag-reach (HEAD -> main)
 	reach (tag: reach, reach)
 	seventh (tag: seventh)
-	Merge-branch-tangle
-	Merge-branch-side-early-part-into-tangle (tangle)
-	tangle-a (tag: tangle-a)
+	Merge-branch-tangle (refs/hidden/tangle)
+	Merge-branch-side-early-part-into-tangle (refs/rewritten/merge, tangle)
+	Merge-branch-main-early-part-into-tangle (refs/prefetch/merge)
 	EOF
 	git log -n6 --decorate=short --pretty="tformat:%f%d" \
 		--decorate-refs-exclude="*octopus*" \
@@ -898,6 +1030,152 @@ test_expect_success 'decorate-refs-exclude and simplify-by-decoration' '
 	test_cmp expect.decorate actual
 '
 
+test_expect_success 'decorate-refs with implied decorate from format' '
+	cat >expect <<-\EOF &&
+	side-2 (tag: side-2)
+	side-1
+	EOF
+	git log --no-walk --format="%s%d" \
+		--decorate-refs="*side-2" side-1 side-2 \
+		>actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'implied decorate does not override option' '
+	cat >expect <<-\EOF &&
+	side-2 (tag: refs/tags/side-2, refs/heads/side)
+	side-1 (tag: refs/tags/side-1)
+	EOF
+	git log --no-walk --format="%s%d" \
+		--decorate=full side-1 side-2 \
+		>actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'decorate-refs and simplify-by-decoration without output' '
+	cat >expect <<-\EOF &&
+	side-2
+	initial
+	EOF
+	# Do not just use a --format without %d here; we want to
+	# make sure that we did not accidentally turn on displaying
+	# the decorations, too. And that requires one of the regular
+	# formats.
+	git log --decorate-refs="*side-2" --oneline \
+		--simplify-by-decoration >actual.raw &&
+	sed "s/^[0-9a-f]* //" <actual.raw >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'decorate-refs-exclude HEAD' '
+	git log --decorate=full --oneline \
+		--decorate-refs-exclude="HEAD" >actual &&
+	! grep HEAD actual
+'
+
+test_expect_success 'decorate-refs focus from default' '
+	git log --decorate=full --oneline \
+		--decorate-refs="refs/heads" >actual &&
+	! grep HEAD actual
+'
+
+test_expect_success '--clear-decorations overrides defaults' '
+	cat >expect.default <<-\EOF &&
+	Merge-tag-reach (HEAD -> refs/heads/main)
+	Merge-tags-octopus-a-and-octopus-b
+	seventh (tag: refs/tags/seventh)
+	octopus-b (tag: refs/tags/octopus-b, refs/heads/octopus-b)
+	octopus-a (tag: refs/tags/octopus-a, refs/heads/octopus-a)
+	reach (tag: refs/tags/reach, refs/heads/reach)
+	Merge-branch-tangle
+	Merge-branch-side-early-part-into-tangle (refs/heads/tangle)
+	Merge-branch-main-early-part-into-tangle
+	tangle-a (tag: refs/tags/tangle-a)
+	Merge-branch-side
+	side-2 (tag: refs/tags/side-2, refs/heads/side)
+	side-1 (tag: refs/tags/side-1)
+	Second
+	sixth
+	fifth
+	fourth
+	third
+	second
+	initial
+	EOF
+	git log --decorate=full --pretty="tformat:%f%d" >actual &&
+	test_cmp expect.default actual &&
+
+	cat >expect.all <<-\EOF &&
+	Merge-tag-reach (HEAD -> refs/heads/main)
+	Merge-tags-octopus-a-and-octopus-b
+	seventh (tag: refs/tags/seventh)
+	octopus-b (tag: refs/tags/octopus-b, refs/heads/octopus-b)
+	octopus-a (tag: refs/tags/octopus-a, refs/heads/octopus-a)
+	reach (tag: refs/tags/reach, refs/heads/reach)
+	Merge-branch-tangle (refs/hidden/tangle)
+	Merge-branch-side-early-part-into-tangle (refs/rewritten/merge, refs/heads/tangle)
+	Merge-branch-main-early-part-into-tangle (refs/prefetch/merge)
+	tangle-a (tag: refs/tags/tangle-a)
+	Merge-branch-side
+	side-2 (tag: refs/tags/side-2, refs/heads/side)
+	side-1 (tag: refs/tags/side-1)
+	Second
+	sixth
+	fifth
+	fourth
+	third
+	second
+	initial
+	EOF
+	git log --decorate=full --pretty="tformat:%f%d" \
+		--clear-decorations >actual &&
+	test_cmp expect.all actual &&
+	git -c log.initialDecorationSet=all log \
+		--decorate=full --pretty="tformat:%f%d" >actual &&
+	test_cmp expect.all actual
+'
+
+test_expect_success '--clear-decorations clears previous exclusions' '
+	cat >expect.all <<-\EOF &&
+	Merge-tag-reach (HEAD -> refs/heads/main)
+	reach (tag: refs/tags/reach, refs/heads/reach)
+	Merge-tags-octopus-a-and-octopus-b
+	octopus-b (tag: refs/tags/octopus-b, refs/heads/octopus-b)
+	octopus-a (tag: refs/tags/octopus-a, refs/heads/octopus-a)
+	seventh (tag: refs/tags/seventh)
+	Merge-branch-tangle (refs/hidden/tangle)
+	Merge-branch-side-early-part-into-tangle (refs/rewritten/merge, refs/heads/tangle)
+	Merge-branch-main-early-part-into-tangle (refs/prefetch/merge)
+	tangle-a (tag: refs/tags/tangle-a)
+	side-2 (tag: refs/tags/side-2, refs/heads/side)
+	side-1 (tag: refs/tags/side-1)
+	initial
+	EOF
+
+	git log --decorate=full --pretty="tformat:%f%d" \
+		--simplify-by-decoration \
+		--decorate-refs-exclude="heads/octopus*" \
+		--decorate-refs="heads" \
+		--clear-decorations >actual &&
+	test_cmp expect.all actual &&
+
+	cat >expect.filtered <<-\EOF &&
+	Merge-tags-octopus-a-and-octopus-b
+	octopus-b (refs/heads/octopus-b)
+	octopus-a (refs/heads/octopus-a)
+	initial
+	EOF
+
+	git log --decorate=full --pretty="tformat:%f%d" \
+		--simplify-by-decoration \
+		--decorate-refs-exclude="heads/octopus" \
+		--decorate-refs="heads" \
+		--clear-decorations \
+		--decorate-refs-exclude="tags/" \
+		--decorate-refs="heads/octopus*" >actual &&
+	test_cmp expect.filtered actual
+'
+
 test_expect_success 'log.decorate config parsing' '
 	git log --oneline --decorate=full >expect.full &&
 	git log --oneline --decorate=short >expect.short &&
@@ -1080,7 +1358,7 @@ cat >expect <<\EOF
 | |\ \  Merge: MERGE_PARENTS
 | | | | Author: A U Thor <author@example.com>
 | | | |
-| | | |     Merge branch 'master' (early part) into tangle
+| | | |     Merge branch 'main' (early part) into tangle
 | | | |
 | * | | commit COMMIT_OBJECT_NAME
 | | | | Author: A U Thor <author@example.com>
@@ -1355,7 +1633,7 @@ cat >expect <<\EOF
 *** | |\ \  Merge: MERGE_PARENTS
 *** | | | | Author: A U Thor <author@example.com>
 *** | | | |
-*** | | | |     Merge branch 'master' (early part) into tangle
+*** | | | |     Merge branch 'main' (early part) into tangle
 *** | | | |
 *** | * | | commit COMMIT_OBJECT_NAME
 *** | | | | Author: A U Thor <author@example.com>
@@ -1580,6 +1858,75 @@ test_expect_success 'log --graph with --name-only' '
 	test_cmp_graph --name-only tangle..reach
 '
 
+test_expect_success '--no-graph countermands --graph' '
+	git log >expect &&
+	git log --graph --no-graph >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success '--graph countermands --no-graph' '
+	git log --graph >expect &&
+	git log --no-graph --graph >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success '--no-graph does not unset --topo-order' '
+	git log --topo-order >expect &&
+	git log --topo-order --no-graph >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success '--no-graph does not unset --parents' '
+	git log --parents >expect &&
+	git log --parents --no-graph >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success '--reverse and --graph conflict' '
+	test_must_fail git log --reverse --graph 2>stderr &&
+	test_grep "cannot be used together" stderr
+'
+
+test_expect_success '--reverse --graph --no-graph works' '
+	git log --reverse >expect &&
+	git log --reverse --graph --no-graph >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success '--show-linear-break and --graph conflict' '
+	test_must_fail git log --show-linear-break --graph 2>stderr &&
+	test_grep "cannot be used together" stderr
+'
+
+test_expect_success '--show-linear-break --graph --no-graph works' '
+	git log --show-linear-break >expect &&
+	git log --show-linear-break --graph --no-graph >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success '--no-walk and --graph conflict' '
+	test_must_fail git log --no-walk --graph 2>stderr &&
+	test_grep "cannot be used together" stderr
+'
+
+test_expect_success '--no-walk --graph --no-graph works' '
+	git log --no-walk >expect &&
+	git log --no-walk --graph --no-graph >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success '--walk-reflogs and --graph conflict' '
+	test_must_fail git log --walk-reflogs --graph 2>stderr &&
+	(test_grep "cannot combine" stderr ||
+		test_grep "cannot be used together" stderr)
+'
+
+test_expect_success '--walk-reflogs --graph --no-graph works' '
+	git log --walk-reflogs >expect &&
+	git log --walk-reflogs --graph --no-graph >actual &&
+	test_cmp expect actual
+'
+
 test_expect_success 'dotdot is a parent directory' '
 	mkdir -p a/b &&
 	( echo sixth && echo fifth ) >expect &&
@@ -1588,24 +1935,24 @@ test_expect_success 'dotdot is a parent directory' '
 '
 
 test_expect_success GPG 'setup signed branch' '
-	test_when_finished "git reset --hard && git checkout master" &&
-	git checkout -b signed master &&
+	test_when_finished "git reset --hard && git checkout main" &&
+	git checkout -b signed main &&
 	echo foo >foo &&
 	git add foo &&
 	git commit -S -m signed_commit
 '
 
 test_expect_success GPG 'setup signed branch with subkey' '
-	test_when_finished "git reset --hard && git checkout master" &&
-	git checkout -b signed-subkey master &&
+	test_when_finished "git reset --hard && git checkout main" &&
+	git checkout -b signed-subkey main &&
 	echo foo >foo &&
 	git add foo &&
 	git commit -SB7227189 -m signed_commit
 '
 
 test_expect_success GPGSM 'setup signed branch x509' '
-	test_when_finished "git reset --hard && git checkout master" &&
-	git checkout -b signed-x509 master &&
+	test_when_finished "git reset --hard && git checkout main" &&
+	git checkout -b signed-x509 main &&
 	echo foo >foo &&
 	git add foo &&
 	test_config gpg.format x509 &&
@@ -1613,6 +1960,34 @@ test_expect_success GPGSM 'setup signed branch x509' '
 	git commit -S -m signed_commit
 '
 
+test_expect_success GPGSSH 'setup sshkey signed branch' '
+	test_config gpg.format ssh &&
+	test_config user.signingkey "${GPGSSH_KEY_PRIMARY}" &&
+	test_when_finished "git reset --hard && git checkout main" &&
+	git checkout -b signed-ssh main &&
+	echo foo >foo &&
+	git add foo &&
+	git commit -S -m signed_commit
+'
+
+test_expect_success GPGSSH,GPGSSH_VERIFYTIME 'create signed commits with keys having defined lifetimes' '
+	test_config gpg.format ssh &&
+	touch file &&
+	git add file &&
+
+	echo expired >file && test_tick && git commit -a -m expired -S"${GPGSSH_KEY_EXPIRED}" &&
+	git tag expired-signed &&
+
+	echo notyetvalid >file && test_tick && git commit -a -m notyetvalid -S"${GPGSSH_KEY_NOTYETVALID}" &&
+	git tag notyetvalid-signed &&
+
+	echo timeboxedvalid >file && test_tick && git commit -a -m timeboxedvalid -S"${GPGSSH_KEY_TIMEBOXEDVALID}" &&
+	git tag timeboxedvalid-signed &&
+
+	echo timeboxedinvalid >file && test_tick && git commit -a -m timeboxedinvalid -S"${GPGSSH_KEY_TIMEBOXEDINVALID}" &&
+	git tag timeboxedinvalid-signed
+'
+
 test_expect_success GPGSM 'log x509 fingerprint' '
 	echo "F8BF62E0693D0694816377099909C779FA23FD65 | " >expect &&
 	git log -n1 --format="%GF | %GP" signed-x509 >actual &&
@@ -1625,6 +2000,13 @@ test_expect_success GPGSM 'log OpenPGP fingerprint' '
 	test_cmp expect actual
 '
 
+test_expect_success GPGSSH 'log ssh key fingerprint' '
+	test_config gpg.ssh.allowedSignersFile "${GPGSSH_ALLOWED_SIGNERS}" &&
+	ssh-keygen -lf  "${GPGSSH_KEY_PRIMARY}" | awk "{print \$2\" | \"}" >expect &&
+	git log -n1 --format="%GF | %GP" signed-ssh >actual &&
+	test_cmp expect actual
+'
+
 test_expect_success GPG 'log --graph --show-signature' '
 	git log --graph --show-signature -n1 signed >actual &&
 	grep "^| gpg: Signature made" actual &&
@@ -1637,13 +2019,44 @@ test_expect_success GPGSM 'log --graph --show-signature x509' '
 	grep "^| gpgsm: Good signature" actual
 '
 
+test_expect_success GPGSSH 'log --graph --show-signature ssh' '
+	test_config gpg.ssh.allowedSignersFile "${GPGSSH_ALLOWED_SIGNERS}" &&
+	git log --graph --show-signature -n1 signed-ssh >actual &&
+	grep "${GOOD_SIGNATURE_TRUSTED}" actual
+'
+
+test_expect_success GPGSSH,GPGSSH_VERIFYTIME 'log shows failure on expired signature key' '
+	test_config gpg.ssh.allowedSignersFile "${GPGSSH_ALLOWED_SIGNERS}" &&
+	git log --graph --show-signature -n1 expired-signed >actual &&
+	! grep "${GPGSSH_GOOD_SIGNATURE_TRUSTED}" actual
+'
+
+test_expect_success GPGSSH,GPGSSH_VERIFYTIME 'log shows failure on not yet valid signature key' '
+	test_config gpg.ssh.allowedSignersFile "${GPGSSH_ALLOWED_SIGNERS}" &&
+	git log --graph --show-signature -n1 notyetvalid-signed >actual &&
+	! grep "${GPGSSH_GOOD_SIGNATURE_TRUSTED}" actual
+'
+
+test_expect_success GPGSSH,GPGSSH_VERIFYTIME 'log show success with commit date and key validity matching' '
+	test_config gpg.ssh.allowedSignersFile "${GPGSSH_ALLOWED_SIGNERS}" &&
+	git log --graph --show-signature -n1 timeboxedvalid-signed >actual &&
+	grep "${GPGSSH_GOOD_SIGNATURE_TRUSTED}" actual &&
+	! grep "${GPGSSH_BAD_SIGNATURE}" actual
+'
+
+test_expect_success GPGSSH,GPGSSH_VERIFYTIME 'log shows failure with commit date outside of key validity' '
+	test_config gpg.ssh.allowedSignersFile "${GPGSSH_ALLOWED_SIGNERS}" &&
+	git log --graph --show-signature -n1 timeboxedinvalid-signed >actual &&
+	! grep "${GPGSSH_GOOD_SIGNATURE_TRUSTED}" actual
+'
+
 test_expect_success GPG 'log --graph --show-signature for merged tag' '
-	test_when_finished "git reset --hard && git checkout master" &&
-	git checkout -b plain master &&
+	test_when_finished "git reset --hard && git checkout main" &&
+	git checkout -b plain main &&
 	echo aaa >bar &&
 	git add bar &&
 	git commit -m bar_commit &&
-	git checkout -b tagged master &&
+	git checkout -b tagged main &&
 	echo bbb >baz &&
 	git add baz &&
 	git commit -m baz_commit &&
@@ -1657,12 +2070,12 @@ test_expect_success GPG 'log --graph --show-signature for merged tag' '
 '
 
 test_expect_success GPG 'log --graph --show-signature for merged tag in shallow clone' '
-	test_when_finished "git reset --hard && git checkout master" &&
-	git checkout -b plain-shallow master &&
+	test_when_finished "git reset --hard && git checkout main" &&
+	git checkout -b plain-shallow main &&
 	echo aaa >bar &&
 	git add bar &&
 	git commit -m bar_commit &&
-	git checkout --detach master &&
+	git checkout --detach main &&
 	echo bbb >baz &&
 	git add baz &&
 	git commit -m baz_commit &&
@@ -1677,12 +2090,12 @@ test_expect_success GPG 'log --graph --show-signature for merged tag in shallow
 '
 
 test_expect_success GPG 'log --graph --show-signature for merged tag with missing key' '
-	test_when_finished "git reset --hard && git checkout master" &&
-	git checkout -b plain-nokey master &&
+	test_when_finished "git reset --hard && git checkout main" &&
+	git checkout -b plain-nokey main &&
 	echo aaa >bar &&
 	git add bar &&
 	git commit -m bar_commit &&
-	git checkout -b tagged-nokey master &&
+	git checkout -b tagged-nokey main &&
 	echo bbb >baz &&
 	git add baz &&
 	git commit -m baz_commit &&
@@ -1696,12 +2109,12 @@ test_expect_success GPG 'log --graph --show-signature for merged tag with missin
 '
 
 test_expect_success GPG 'log --graph --show-signature for merged tag with bad signature' '
-	test_when_finished "git reset --hard && git checkout master" &&
-	git checkout -b plain-bad master &&
+	test_when_finished "git reset --hard && git checkout main" &&
+	git checkout -b plain-bad main &&
 	echo aaa >bar &&
 	git add bar &&
 	git commit -m bar_commit &&
-	git checkout -b tagged-bad master &&
+	git checkout -b tagged-bad main &&
 	echo bbb >baz &&
 	git add baz &&
 	git commit -m baz_commit &&
@@ -1718,33 +2131,36 @@ test_expect_success GPG 'log --graph --show-signature for merged tag with bad si
 '
 
 test_expect_success GPG 'log --show-signature for merged tag with GPG failure' '
-	test_when_finished "git reset --hard && git checkout master" &&
-	git checkout -b plain-fail master &&
+	test_when_finished "git reset --hard && git checkout main" &&
+	git checkout -b plain-fail main &&
 	echo aaa >bar &&
 	git add bar &&
 	git commit -m bar_commit &&
-	git checkout -b tagged-fail master &&
+	git checkout -b tagged-fail main &&
 	echo bbb >baz &&
 	git add baz &&
 	git commit -m baz_commit &&
 	git tag -s -m signed_tag_msg signed_tag_fail &&
 	git checkout plain-fail &&
 	git merge --no-ff -m msg signed_tag_fail &&
-	TMPDIR="$(pwd)/bogus" git log --show-signature -n1 plain-fail >actual &&
-	grep "^merged tag" actual &&
-	grep "^No signature" actual &&
-	! grep "^gpg: Signature made" actual
+	if ! test_have_prereq VALGRIND
+	then
+		TMPDIR="$(pwd)/bogus" git log --show-signature -n1 plain-fail >actual &&
+		grep "^merged tag" actual &&
+		grep "^No signature" actual &&
+		! grep "^gpg: Signature made" actual
+	fi
 '
 
 test_expect_success GPGSM 'log --graph --show-signature for merged tag x509' '
-	test_when_finished "git reset --hard && git checkout master" &&
+	test_when_finished "git reset --hard && git checkout main" &&
 	test_config gpg.format x509 &&
 	test_config user.signingkey $GIT_COMMITTER_EMAIL &&
-	git checkout -b plain-x509 master &&
+	git checkout -b plain-x509 main &&
 	echo aaa >bar &&
 	git add bar &&
 	git commit -m bar_commit &&
-	git checkout -b tagged-x509 master &&
+	git checkout -b tagged-x509 main &&
 	echo bbb >baz &&
 	git add baz &&
 	git commit -m baz_commit &&
@@ -1758,14 +2174,14 @@ test_expect_success GPGSM 'log --graph --show-signature for merged tag x509' '
 '
 
 test_expect_success GPGSM 'log --graph --show-signature for merged tag x509 missing key' '
-	test_when_finished "git reset --hard && git checkout master" &&
+	test_when_finished "git reset --hard && git checkout main" &&
 	test_config gpg.format x509 &&
 	test_config user.signingkey $GIT_COMMITTER_EMAIL &&
-	git checkout -b plain-x509-nokey master &&
+	git checkout -b plain-x509-nokey main &&
 	echo aaa >bar &&
 	git add bar &&
 	git commit -m bar_commit &&
-	git checkout -b tagged-x509-nokey master &&
+	git checkout -b tagged-x509-nokey main &&
 	echo bbb >baz &&
 	git add baz &&
 	git commit -m baz_commit &&
@@ -1774,18 +2190,19 @@ test_expect_success GPGSM 'log --graph --show-signature for merged tag x509 miss
 	git merge --no-ff -m msg signed_tag_x509_nokey &&
 	GNUPGHOME=. git log --graph --show-signature -n1 plain-x509-nokey >actual &&
 	grep "^|\\\  merged tag" actual &&
-	grep "^| | gpgsm: certificate not found" actual
+	grep -e "^| | gpgsm: certificate not found" \
+	     -e "^| | gpgsm: failed to find the certificate: Not found" actual
 '
 
 test_expect_success GPGSM 'log --graph --show-signature for merged tag x509 bad signature' '
-	test_when_finished "git reset --hard && git checkout master" &&
+	test_when_finished "git reset --hard && git checkout main" &&
 	test_config gpg.format x509 &&
 	test_config user.signingkey $GIT_COMMITTER_EMAIL &&
-	git checkout -b plain-x509-bad master &&
+	git checkout -b plain-x509-bad main &&
 	echo aaa >bar &&
 	git add bar &&
 	git commit -m bar_commit &&
-	git checkout -b tagged-x509-bad master &&
+	git checkout -b tagged-x509-bad main &&
 	echo bbb >baz &&
 	git add baz &&
 	git commit -m baz_commit &&
@@ -1831,18 +2248,11 @@ test_expect_success 'log --graph --no-walk is forbidden' '
 	test_must_fail git log --graph --no-walk
 '
 
-test_expect_success 'log diagnoses bogus HEAD' '
+test_expect_success 'log on empty repo fails' '
 	git init empty &&
+	test_when_finished "rm -rf empty" &&
 	test_must_fail git -C empty log 2>stderr &&
-	test_i18ngrep does.not.have.any.commits stderr &&
-	echo 1234abcd >empty/.git/refs/heads/master &&
-	test_must_fail git -C empty log 2>stderr &&
-	test_i18ngrep broken stderr &&
-	echo "ref: refs/heads/invalid.lock" >empty/.git/HEAD &&
-	test_must_fail git -C empty log 2>stderr &&
-	test_i18ngrep broken stderr &&
-	test_must_fail git -C empty log --default totally-bogus 2>stderr &&
-	test_i18ngrep broken stderr
+	test_grep does.not.have.any.commits stderr
 '
 
 test_expect_success 'log does not default to HEAD when rev input is given' '
@@ -1850,6 +2260,16 @@ test_expect_success 'log does not default to HEAD when rev input is given' '
 	test_must_be_empty actual
 '
 
+test_expect_success 'do not default to HEAD with ignored object on cmdline' '
+	git log --ignore-missing $ZERO_OID >actual &&
+	test_must_be_empty actual
+'
+
+test_expect_success 'do not default to HEAD with ignored object on stdin' '
+	echo $ZERO_OID | git log --ignore-missing --stdin >actual &&
+	test_must_be_empty actual
+'
+
 test_expect_success 'set up --source tests' '
 	git checkout --orphan source-a &&
 	test_commit one &&
@@ -1892,11 +2312,58 @@ test_expect_success '--exclude-promisor-objects does not BUG-crash' '
 	test_must_fail git log --exclude-promisor-objects source-a
 '
 
+test_expect_success 'log --decorate includes all levels of tag annotated tags' '
+	git checkout -b branch &&
+	git commit --allow-empty -m "new commit" &&
+	git tag lightweight HEAD &&
+	git tag -m annotated annotated HEAD &&
+	git tag -m double-0 double-0 HEAD &&
+	git tag -m double-1 double-1 double-0 &&
+	cat >expect <<-\EOF &&
+	HEAD -> branch, tag: lightweight, tag: double-1, tag: double-0, tag: annotated
+	EOF
+	git log -1 --format="%D" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'log --decorate does not include things outside filter' '
+	reflist="refs/prefetch refs/rebase-merge refs/bundle" &&
+
+	for ref in $reflist
+	do
+		git update-ref $ref/fake HEAD || return 1
+	done &&
+
+	git log --decorate=full --oneline >actual &&
+
+	# None of the refs are visible:
+	! grep /fake actual
+'
+
 test_expect_success 'log --end-of-options' '
-       git update-ref refs/heads/--source HEAD &&
-       git log --end-of-options --source >actual &&
-       git log >expect &&
-       test_cmp expect actual
+	git update-ref refs/heads/--source HEAD &&
+	git log --end-of-options --source >actual &&
+	git log >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'set up commits with different authors' '
+	git checkout --orphan authors &&
+	test_commit --author "Jim <jim@example.com>" jim_1 &&
+	test_commit --author "Val <val@example.com>" val_1 &&
+	test_commit --author "Val <val@example.com>" val_2 &&
+	test_commit --author "Jim <jim@example.com>" jim_2 &&
+	test_commit --author "Val <val@example.com>" val_3 &&
+	test_commit --author "Jim <jim@example.com>" jim_3
+'
+
+test_expect_success 'log --invert-grep --grep --author' '
+	cat >expect <<-\EOF &&
+	val_3
+	val_1
+	EOF
+	git log --format=%s --author=Val --grep 2 --invert-grep >actual &&
+	test_cmp expect actual
 '
 
 test_done
diff --git a/t/t4203-mailmap.sh b/t/t4203-mailmap.sh
index 586c3a8..8a88dd7 100755
--- a/t/t4203-mailmap.sh
+++ b/t/t4203-mailmap.sh
@@ -2,30 +2,14 @@
 
 test_description='.mailmap configurations'
 
-. ./test-lib.sh
-
-fuzz_blame () {
-	sed "
-		s/$_x05[0-9a-f][0-9a-f][0-9a-f]/OBJID/g
-		s/$_x05[0-9a-f][0-9a-f]/OBJI/g
-		s/[-0-9]\{10\} [:0-9]\{8\} [-+][0-9]\{4\}/DATE/g
-	" "$@"
-}
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
-test_expect_success setup '
-	cat >contacts <<- EOF &&
-	$GIT_AUTHOR_NAME <$GIT_AUTHOR_EMAIL>
-	nick1 <bugs@company.xx>
-	EOF
+. ./test-lib.sh
 
-	echo one >one &&
-	git add one &&
-	test_tick &&
-	git commit -m initial &&
-	echo two >>one &&
-	git add one &&
-	test_tick &&
-	git commit --author "nick1 <bugs@company.xx>" -m second
+test_expect_success 'setup commits and contacts file' '
+	test_commit initial one one &&
+	test_commit --author "nick1 <bugs@company.xx>" --append second one two
 '
 
 test_expect_success 'check-mailmap no arguments' '
@@ -33,7 +17,7 @@ test_expect_success 'check-mailmap no arguments' '
 '
 
 test_expect_success 'check-mailmap arguments' '
-	cat >expect <<- EOF &&
+	cat >expect <<-EOF &&
 	$GIT_AUTHOR_NAME <$GIT_AUTHOR_EMAIL>
 	nick1 <bugs@company.xx>
 	EOF
@@ -44,172 +28,256 @@ test_expect_success 'check-mailmap arguments' '
 '
 
 test_expect_success 'check-mailmap --stdin' '
-	cat >expect <<- EOF &&
+	cat >expect <<-EOF &&
 	$GIT_AUTHOR_NAME <$GIT_AUTHOR_EMAIL>
 	nick1 <bugs@company.xx>
 	EOF
-	git check-mailmap --stdin <contacts >actual &&
+	git check-mailmap --stdin <expect >actual &&
 	test_cmp expect actual
 '
 
-test_expect_success 'check-mailmap --stdin arguments' '
+test_expect_success 'check-mailmap --stdin arguments: no mapping' '
+	test_when_finished "rm contacts" &&
+	cat >contacts <<-EOF &&
+	$GIT_AUTHOR_NAME <$GIT_AUTHOR_EMAIL>
+	nick1 <bugs@company.xx>
+	EOF
 	cat >expect <<-\EOF &&
 	Internal Guy <bugs@company.xy>
 	EOF
-	cat <contacts >>expect &&
+	cat contacts >>expect &&
+
 	git check-mailmap --stdin "Internal Guy <bugs@company.xy>" \
 		<contacts >actual &&
 	test_cmp expect actual
 '
 
+test_expect_success 'check-mailmap --stdin arguments: mapping' '
+	test_when_finished "rm .mailmap" &&
+	cat >.mailmap <<-EOF &&
+	New Name <$GIT_AUTHOR_EMAIL>
+	EOF
+	cat >stdin <<-EOF &&
+	Old Name <$GIT_AUTHOR_EMAIL>
+	EOF
+
+	cp .mailmap expect &&
+	git check-mailmap --stdin <stdin >actual &&
+	test_cmp expect actual &&
+
+	cat .mailmap >>expect &&
+	git check-mailmap --stdin "Another Old Name <$GIT_AUTHOR_EMAIL>" \
+		<stdin >actual &&
+	test_cmp expect actual
+'
+
 test_expect_success 'check-mailmap bogus contact' '
 	test_must_fail git check-mailmap bogus
 '
 
-cat >expect << EOF
-$GIT_AUTHOR_NAME (1):
-      initial
+test_expect_success 'check-mailmap bogus contact --stdin' '
+	test_must_fail git check-mailmap --stdin bogus </dev/null
+'
 
-nick1 (1):
-      second
+test_expect_success 'No mailmap' '
+	cat >expect <<-EOF &&
+	$GIT_AUTHOR_NAME (1):
+	      initial
 
-EOF
+	nick1 (1):
+	      second
 
-test_expect_success 'No mailmap' '
+	EOF
 	git shortlog HEAD >actual &&
 	test_cmp expect actual
 '
 
-cat >expect <<\EOF
-Repo Guy (1):
-      initial
+test_expect_success 'setup default .mailmap' '
+	cat >default.map <<-EOF
+	Repo Guy <$GIT_AUTHOR_EMAIL>
+	EOF
+'
+
+test_expect_success 'test default .mailmap' '
+	test_when_finished "rm .mailmap" &&
+	cp default.map .mailmap &&
 
-nick1 (1):
-      second
+	cat >expect <<-\EOF &&
+	Repo Guy (1):
+	      initial
 
-EOF
+	nick1 (1):
+	      second
 
-test_expect_success 'default .mailmap' '
-	echo "Repo Guy <$GIT_AUTHOR_EMAIL>" > .mailmap &&
+	EOF
 	git shortlog HEAD >actual &&
 	test_cmp expect actual
 '
 
-# Using a mailmap file in a subdirectory of the repo here, but
-# could just as well have been a file outside of the repository
-cat >expect <<\EOF
-Internal Guy (1):
-      second
+test_expect_success 'mailmap.file set' '
+	test_when_finished "rm .mailmap" &&
+	cp default.map .mailmap &&
 
-Repo Guy (1):
-      initial
+	test_config mailmap.file internal.map &&
+	cat >internal.map <<-\EOF &&
+	Internal Guy <bugs@company.xx>
+	EOF
 
-EOF
-test_expect_success 'mailmap.file set' '
-	mkdir -p internal_mailmap &&
-	echo "Internal Guy <bugs@company.xx>" > internal_mailmap/.mailmap &&
-	git config mailmap.file internal_mailmap/.mailmap &&
+	cat >expect <<-\EOF &&
+	Internal Guy (1):
+	      second
+
+	Repo Guy (1):
+	      initial
+
+	EOF
 	git shortlog HEAD >actual &&
-	test_cmp expect actual
+	test_cmp expect actual &&
+
+	# The internal_mailmap/.mailmap file is an a subdirectory, but
+	# as shown here it can also be outside the repository
+	test_when_finished "rm -rf sub-repo" &&
+	git clone . sub-repo &&
+	(
+		cd sub-repo &&
+		cp ../.mailmap . &&
+		git config mailmap.file ../internal.map &&
+		git shortlog HEAD >actual &&
+		test_cmp ../expect actual
+	)
 '
 
-cat >expect <<\EOF
-External Guy (1):
-      initial
+test_expect_success 'mailmap.file override' '
+	test_config mailmap.file internal.map &&
+	cat >internal.map <<-EOF &&
+	Internal Guy <bugs@company.xx>
+	External Guy <$GIT_AUTHOR_EMAIL>
+	EOF
 
-Internal Guy (1):
-      second
+	cat >expect <<-\EOF &&
+	External Guy (1):
+	      initial
 
-EOF
-test_expect_success 'mailmap.file override' '
-	echo "External Guy <$GIT_AUTHOR_EMAIL>" >> internal_mailmap/.mailmap &&
-	git config mailmap.file internal_mailmap/.mailmap &&
+	Internal Guy (1):
+	      second
+
+	EOF
 	git shortlog HEAD >actual &&
 	test_cmp expect actual
 '
 
-cat >expect <<\EOF
-Repo Guy (1):
-      initial
+test_expect_success 'mailmap.file non-existent' '
+	test_when_finished "rm .mailmap" &&
+	cp default.map .mailmap &&
 
-nick1 (1):
-      second
+	cat >expect <<-\EOF &&
+	Repo Guy (1):
+	      initial
 
-EOF
+	nick1 (1):
+	      second
 
-test_expect_success 'mailmap.file non-existent' '
-	rm internal_mailmap/.mailmap &&
-	rmdir internal_mailmap &&
+	EOF
 	git shortlog HEAD >actual &&
 	test_cmp expect actual
 '
 
-cat >expect <<\EOF
-Internal Guy (1):
-      second
+test_expect_success 'name entry after email entry' '
+	test_when_finished "rm .mailmap" &&
+	cp default.map .mailmap &&
+
+	test_config mailmap.file internal.map &&
+	cat >internal.map <<-\EOF &&
+	<bugs@company.xy> <bugs@company.xx>
+	Internal Guy <bugs@company.xx>
+	EOF
+
+	cat >expect <<-\EOF &&
+	Internal Guy (1):
+	      second
 
-Repo Guy (1):
-      initial
+	Repo Guy (1):
+	      initial
 
-EOF
+	EOF
 
-test_expect_success 'name entry after email entry' '
-	mkdir -p internal_mailmap &&
-	echo "<bugs@company.xy> <bugs@company.xx>" >internal_mailmap/.mailmap &&
-	echo "Internal Guy <bugs@company.xx>" >>internal_mailmap/.mailmap &&
 	git shortlog HEAD >actual &&
 	test_cmp expect actual
 '
 
-cat >expect <<\EOF
-Internal Guy (1):
-      second
+test_expect_success 'name entry after email entry, case-insensitive' '
+	test_when_finished "rm .mailmap" &&
+	cp default.map .mailmap &&
+
+	test_config mailmap.file internal.map &&
+	cat >internal.map <<-\EOF &&
+	<bugs@company.xy> <bugs@company.xx>
+	Internal Guy <BUGS@Company.xx>
+	EOF
 
-Repo Guy (1):
-      initial
+	cat >expect <<-\EOF &&
+	Internal Guy (1):
+	      second
 
-EOF
+	Repo Guy (1):
+	      initial
 
-test_expect_success 'name entry after email entry, case-insensitive' '
-	mkdir -p internal_mailmap &&
-	echo "<bugs@company.xy> <bugs@company.xx>" >internal_mailmap/.mailmap &&
-	echo "Internal Guy <BUGS@Company.xx>" >>internal_mailmap/.mailmap &&
+	EOF
+	git shortlog HEAD >actual &&
+	test_cmp expect actual &&
+
+	cat >internal.map <<-\EOF &&
+	NiCk <BuGs@CoMpAnY.Xy> NICK1 <BUGS@COMPANY.XX>
+	EOF
+
+	cat >expect <<-\EOF &&
+	NiCk (1):
+	      second
+
+	Repo Guy (1):
+	      initial
+
+	EOF
 	git shortlog HEAD >actual &&
 	test_cmp expect actual
 '
 
-cat >expect << EOF
-$GIT_AUTHOR_NAME (1):
-      initial
+test_expect_success 'No mailmap files, but configured' '
+	cat >expect <<-EOF &&
+	$GIT_AUTHOR_NAME (1):
+	      initial
 
-nick1 (1):
-      second
+	nick1 (1):
+	      second
 
-EOF
-test_expect_success 'No mailmap files, but configured' '
-	rm -f .mailmap internal_mailmap/.mailmap &&
+	EOF
 	git shortlog HEAD >actual &&
 	test_cmp expect actual
 '
 
 test_expect_success 'setup mailmap blob tests' '
 	git checkout -b map &&
-	test_when_finished "git checkout master" &&
-	cat >just-bugs <<- EOF &&
+	test_when_finished "git checkout main" &&
+	cat >just-bugs <<-\EOF &&
 	Blob Guy <bugs@company.xx>
 	EOF
-	cat >both <<- EOF &&
+	cat >both <<-EOF &&
 	Blob Guy <$GIT_AUTHOR_EMAIL>
 	Blob Guy <bugs@company.xx>
 	EOF
 	printf "Tricky Guy <$GIT_AUTHOR_EMAIL>" >no-newline &&
 	git add just-bugs both no-newline &&
 	git commit -m "my mailmaps" &&
-	echo "Repo Guy <$GIT_AUTHOR_EMAIL>" >.mailmap &&
-	echo "Internal Guy <$GIT_AUTHOR_EMAIL>" >internal.map
+
+	cat >internal.map <<-EOF
+	Internal Guy <$GIT_AUTHOR_EMAIL>
+	EOF
 '
 
 test_expect_success 'mailmap.blob set' '
+	test_when_finished "rm .mailmap" &&
+	cp default.map .mailmap &&
+
 	cat >expect <<-\EOF &&
 	Blob Guy (1):
 	      second
@@ -223,6 +291,9 @@ test_expect_success 'mailmap.blob set' '
 '
 
 test_expect_success 'mailmap.blob overrides .mailmap' '
+	test_when_finished "rm .mailmap" &&
+	cp default.map .mailmap &&
+
 	cat >expect <<-\EOF &&
 	Blob Guy (2):
 	      initial
@@ -249,7 +320,28 @@ test_expect_success 'mailmap.file overrides mailmap.blob' '
 	test_cmp expect actual
 '
 
+test_expect_success 'mailmap.file can be missing' '
+	test_when_finished "rm .mailmap" &&
+	cp default.map .mailmap &&
+
+	test_config mailmap.file nonexistent &&
+	cat >expect <<-\EOF &&
+	Repo Guy (1):
+	      initial
+
+	nick1 (1):
+	      second
+
+	EOF
+	git shortlog HEAD >actual 2>err &&
+	test_must_be_empty err &&
+	test_cmp expect actual
+'
+
 test_expect_success 'mailmap.blob can be missing' '
+	test_when_finished "rm .mailmap" &&
+	cp default.map .mailmap &&
+
 	cat >expect <<-\EOF &&
 	Repo Guy (1):
 	      initial
@@ -258,7 +350,17 @@ test_expect_success 'mailmap.blob can be missing' '
 	      second
 
 	EOF
-	git -c mailmap.blob=map:nonexistent shortlog HEAD >actual &&
+	git -c mailmap.blob=map:nonexistent shortlog HEAD >actual 2>err &&
+	test_must_be_empty err &&
+	test_cmp expect actual
+'
+
+test_expect_success 'mailmap.blob might be the wrong type' '
+	test_when_finished "rm .mailmap" &&
+	cp default.map .mailmap &&
+
+	git -c mailmap.blob=HEAD: shortlog HEAD >actual 2>err &&
+	test_grep "mailmap is not a blob" err &&
 	test_cmp expect actual
 '
 
@@ -267,11 +369,15 @@ test_expect_success 'mailmap.blob defaults to off in non-bare repo' '
 	(
 		cd non-bare &&
 		test_commit one .mailmap "Fake Name <$GIT_AUTHOR_EMAIL>" &&
-		echo "     1	Fake Name" >expect &&
+		cat >expect <<-\EOF &&
+		     1	Fake Name
+		EOF
 		git shortlog -ns HEAD >actual &&
 		test_cmp expect actual &&
 		rm .mailmap &&
-		echo "     1	$GIT_AUTHOR_NAME" >expect &&
+		cat >expect <<-EOF &&
+		     1	$GIT_AUTHOR_NAME
+		EOF
 		git shortlog -ns HEAD >actual &&
 		test_cmp expect actual
 	)
@@ -281,7 +387,9 @@ test_expect_success 'mailmap.blob defaults to HEAD:.mailmap in bare repo' '
 	git clone --bare non-bare bare &&
 	(
 		cd bare &&
-		echo "     1	Fake Name" >expect &&
+		cat >expect <<-\EOF &&
+		     1	Fake Name
+		EOF
 		git shortlog -ns HEAD >actual &&
 		test_cmp expect actual
 	)
@@ -300,178 +408,260 @@ test_expect_success 'mailmap.blob can handle blobs without trailing newline' '
 	test_cmp expect actual
 '
 
-test_expect_success 'cleanup after mailmap.blob tests' '
-	rm -f .mailmap
-'
-
 test_expect_success 'single-character name' '
-	echo "     1	A <$GIT_AUTHOR_EMAIL>" >expect &&
-	echo "     1	nick1 <bugs@company.xx>" >>expect &&
-	echo "A <$GIT_AUTHOR_EMAIL>" >.mailmap &&
 	test_when_finished "rm .mailmap" &&
+	cat >.mailmap <<-EOF &&
+	A <$GIT_AUTHOR_EMAIL>
+	EOF
+
+	cat >expect <<-EOF &&
+	     1	A <$GIT_AUTHOR_EMAIL>
+	     1	nick1 <bugs@company.xx>
+	EOF
 	git shortlog -es HEAD >actual &&
 	test_cmp expect actual
 '
 
 test_expect_success 'preserve canonical email case' '
-	echo "     1	$GIT_AUTHOR_NAME <AUTHOR@example.com>" >expect &&
-	echo "     1	nick1 <bugs@company.xx>" >>expect &&
-	echo "<AUTHOR@example.com> <$GIT_AUTHOR_EMAIL>" >.mailmap &&
 	test_when_finished "rm .mailmap" &&
+	cat >.mailmap <<-EOF &&
+	<AUTHOR@example.com> <$GIT_AUTHOR_EMAIL>
+	EOF
+
+	cat >expect <<-EOF &&
+	     1	$GIT_AUTHOR_NAME <AUTHOR@example.com>
+	     1	nick1 <bugs@company.xx>
+	EOF
 	git shortlog -es HEAD >actual &&
 	test_cmp expect actual
 '
 
-# Extended mailmap configurations should give us the following output for shortlog
-cat >expect << EOF
-$GIT_AUTHOR_NAME <$GIT_AUTHOR_EMAIL> (1):
-      initial
+test_expect_success 'gitmailmap(5) example output: setup' '
+	test_create_repo doc &&
+	test_commit -C doc --author "Joe Developer <joe@example.com>" A &&
+	test_commit -C doc --author "Joe R. Developer <joe@example.com>" B &&
+	test_commit -C doc --author "Jane Doe <jane@example.com>" C &&
+	test_commit -C doc --author "Jane Doe <jane@laptop.(none)>" D &&
+	test_commit -C doc --author "Jane D. <jane@desktop.(none)>" E
+'
+
+test_expect_success 'gitmailmap(5) example output: example #1' '
+	test_config -C doc mailmap.file ../doc.map &&
+	cat >doc.map <<-\EOF &&
+	Joe R. Developer <joe@example.com>
+	Jane Doe <jane@example.com>
+	Jane Doe <jane@desktop.(none)>
+	EOF
+
+	cat >expect <<-\EOF &&
+	Author Joe Developer <joe@example.com> maps to Joe R. Developer <joe@example.com>
+	Committer C O Mitter <committer@example.com> maps to C O Mitter <committer@example.com>
+
+	Author Joe R. Developer <joe@example.com> maps to Joe R. Developer <joe@example.com>
+	Committer C O Mitter <committer@example.com> maps to C O Mitter <committer@example.com>
+
+	Author Jane Doe <jane@example.com> maps to Jane Doe <jane@example.com>
+	Committer C O Mitter <committer@example.com> maps to C O Mitter <committer@example.com>
+
+	Author Jane Doe <jane@laptop.(none)> maps to Jane Doe <jane@laptop.(none)>
+	Committer C O Mitter <committer@example.com> maps to C O Mitter <committer@example.com>
+
+	Author Jane D. <jane@desktop.(none)> maps to Jane Doe <jane@desktop.(none)>
+	Committer C O Mitter <committer@example.com> maps to C O Mitter <committer@example.com>
+	EOF
+	git -C doc log --reverse --pretty=format:"Author %an <%ae> maps to %aN <%aE>%nCommitter %cn <%ce> maps to %cN <%cE>%n" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'gitmailmap(5) example output: example #2' '
+	test_config -C doc mailmap.file ../doc.map &&
+	cat >doc.map <<-\EOF &&
+	Joe R. Developer <joe@example.com>
+	Jane Doe <jane@example.com> <jane@laptop.(none)>
+	Jane Doe <jane@example.com> <jane@desktop.(none)>
+	EOF
+
+	cat >expect <<-\EOF &&
+	Author Joe Developer <joe@example.com> maps to Joe R. Developer <joe@example.com>
+	Committer C O Mitter <committer@example.com> maps to C O Mitter <committer@example.com>
 
-CTO <cto@company.xx> (1):
-      seventh
+	Author Joe R. Developer <joe@example.com> maps to Joe R. Developer <joe@example.com>
+	Committer C O Mitter <committer@example.com> maps to C O Mitter <committer@example.com>
 
-Other Author <other@author.xx> (2):
-      third
-      fourth
+	Author Jane Doe <jane@example.com> maps to Jane Doe <jane@example.com>
+	Committer C O Mitter <committer@example.com> maps to C O Mitter <committer@example.com>
 
-Santa Claus <santa.claus@northpole.xx> (2):
-      fifth
-      sixth
+	Author Jane Doe <jane@laptop.(none)> maps to Jane Doe <jane@example.com>
+	Committer C O Mitter <committer@example.com> maps to C O Mitter <committer@example.com>
 
-Some Dude <some@dude.xx> (1):
-      second
+	Author Jane D. <jane@desktop.(none)> maps to Jane Doe <jane@example.com>
+	Committer C O Mitter <committer@example.com> maps to C O Mitter <committer@example.com>
+	EOF
+	git -C doc log --reverse --pretty=format:"Author %an <%ae> maps to %aN <%aE>%nCommitter %cn <%ce> maps to %cN <%cE>%n" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'gitmailmap(5) example output: example #3' '
+	test_config -C doc mailmap.file ../doc.map &&
+	cat >>doc.map <<-\EOF &&
+	Joe R. Developer <joe@example.com> Joe <bugs@example.com>
+	Jane Doe <jane@example.com> Jane <bugs@example.com>
+	EOF
+
+	test_commit -C doc --author "Joe <bugs@example.com>" F &&
+	test_commit -C doc --author "Jane <bugs@example.com>" G &&
+
+	cat >>expect <<-\EOF &&
+
+	Author Joe <bugs@example.com> maps to Joe R. Developer <joe@example.com>
+	Committer C O Mitter <committer@example.com> maps to C O Mitter <committer@example.com>
+
+	Author Jane <bugs@example.com> maps to Jane Doe <jane@example.com>
+	Committer C O Mitter <committer@example.com> maps to C O Mitter <committer@example.com>
+	EOF
+	git -C doc log --reverse --pretty=format:"Author %an <%ae> maps to %aN <%aE>%nCommitter %cn <%ce> maps to %cN <%cE>%n" >actual &&
+	test_cmp expect actual
+'
 
-EOF
 
 test_expect_success 'Shortlog output (complex mapping)' '
-	echo three >>one &&
-	git add one &&
-	test_tick &&
-	git commit --author "nick2 <bugs@company.xx>" -m third &&
-
-	echo four >>one &&
-	git add one &&
-	test_tick &&
-	git commit --author "nick2 <nick2@company.xx>" -m fourth &&
-
-	echo five >>one &&
-	git add one &&
-	test_tick &&
-	git commit --author "santa <me@company.xx>" -m fifth &&
-
-	echo six >>one &&
-	git add one &&
-	test_tick &&
-	git commit --author "claus <me@company.xx>" -m sixth &&
-
-	echo seven >>one &&
-	git add one &&
-	test_tick &&
-	git commit --author "CTO <cto@coompany.xx>" -m seventh &&
-
-	mkdir -p internal_mailmap &&
-	echo "Committed <$GIT_COMMITTER_EMAIL>" > internal_mailmap/.mailmap &&
-	echo "<cto@company.xx>                       <cto@coompany.xx>" >> internal_mailmap/.mailmap &&
-	echo "Some Dude <some@dude.xx>         nick1 <bugs@company.xx>" >> internal_mailmap/.mailmap &&
-	echo "Other Author <other@author.xx>   nick2 <bugs@company.xx>" >> internal_mailmap/.mailmap &&
-	echo "Other Author <other@author.xx>         <nick2@company.xx>" >> internal_mailmap/.mailmap &&
-	echo "Santa Claus <santa.claus@northpole.xx> <me@company.xx>" >> internal_mailmap/.mailmap &&
-	echo "Santa Claus <santa.claus@northpole.xx> <me@company.xx>" >> internal_mailmap/.mailmap &&
+	test_config mailmap.file complex.map &&
+	cat >complex.map <<-EOF &&
+	Committed <$GIT_COMMITTER_EMAIL>
+	<cto@company.xx> <cto@coompany.xx>
+	Some Dude <some@dude.xx>         nick1 <bugs@company.xx>
+	Other Author <other@author.xx>   nick2 <bugs@company.xx>
+	Other Author <other@author.xx>         <nick2@company.xx>
+	Santa Claus <santa.claus@northpole.xx> <me@company.xx>
+	EOF
+
+	test_commit --author "nick2 <bugs@company.xx>" --append third one three &&
+	test_commit --author "nick2 <nick2@company.xx>" --append fourth one four &&
+	test_commit --author "santa <me@company.xx>" --append fifth one five &&
+	test_commit --author "claus <me@company.xx>" --append sixth one six &&
+	test_commit --author "CTO <cto@coompany.xx>" --append seventh one seven &&
+
+	cat >expect <<-EOF &&
+	$GIT_AUTHOR_NAME <$GIT_AUTHOR_EMAIL> (1):
+	      initial
+
+	CTO <cto@company.xx> (1):
+	      seventh
+
+	Other Author <other@author.xx> (2):
+	      third
+	      fourth
+
+	Santa Claus <santa.claus@northpole.xx> (2):
+	      fifth
+	      sixth
+
+	Some Dude <some@dude.xx> (1):
+	      second
+
+	EOF
 
 	git shortlog -e HEAD >actual &&
 	test_cmp expect actual
 
 '
 
-# git log with --pretty format which uses the name and email mailmap placemarkers
-cat >expect << EOF
-Author CTO <cto@coompany.xx> maps to CTO <cto@company.xx>
-Committer $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> maps to Committed <$GIT_COMMITTER_EMAIL>
+test_expect_success 'Log output (complex mapping)' '
+	test_config mailmap.file complex.map &&
 
-Author claus <me@company.xx> maps to Santa Claus <santa.claus@northpole.xx>
-Committer $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> maps to Committed <$GIT_COMMITTER_EMAIL>
+	cat >expect <<-EOF &&
+	Author CTO <cto@coompany.xx> maps to CTO <cto@company.xx>
+	Committer $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> maps to Committed <$GIT_COMMITTER_EMAIL>
 
-Author santa <me@company.xx> maps to Santa Claus <santa.claus@northpole.xx>
-Committer $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> maps to Committed <$GIT_COMMITTER_EMAIL>
+	Author claus <me@company.xx> maps to Santa Claus <santa.claus@northpole.xx>
+	Committer $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> maps to Committed <$GIT_COMMITTER_EMAIL>
 
-Author nick2 <nick2@company.xx> maps to Other Author <other@author.xx>
-Committer $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> maps to Committed <$GIT_COMMITTER_EMAIL>
+	Author santa <me@company.xx> maps to Santa Claus <santa.claus@northpole.xx>
+	Committer $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> maps to Committed <$GIT_COMMITTER_EMAIL>
 
-Author nick2 <bugs@company.xx> maps to Other Author <other@author.xx>
-Committer $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> maps to Committed <$GIT_COMMITTER_EMAIL>
+	Author nick2 <nick2@company.xx> maps to Other Author <other@author.xx>
+	Committer $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> maps to Committed <$GIT_COMMITTER_EMAIL>
 
-Author nick1 <bugs@company.xx> maps to Some Dude <some@dude.xx>
-Committer $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> maps to Committed <$GIT_COMMITTER_EMAIL>
+	Author nick2 <bugs@company.xx> maps to Other Author <other@author.xx>
+	Committer $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> maps to Committed <$GIT_COMMITTER_EMAIL>
 
-Author $GIT_AUTHOR_NAME <$GIT_AUTHOR_EMAIL> maps to $GIT_AUTHOR_NAME <$GIT_AUTHOR_EMAIL>
-Committer $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> maps to Committed <$GIT_COMMITTER_EMAIL>
-EOF
+	Author nick1 <bugs@company.xx> maps to Some Dude <some@dude.xx>
+	Committer $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> maps to Committed <$GIT_COMMITTER_EMAIL>
+
+	Author $GIT_AUTHOR_NAME <$GIT_AUTHOR_EMAIL> maps to $GIT_AUTHOR_NAME <$GIT_AUTHOR_EMAIL>
+	Committer $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> maps to Committed <$GIT_COMMITTER_EMAIL>
+	EOF
 
-test_expect_success 'Log output (complex mapping)' '
 	git log --pretty=format:"Author %an <%ae> maps to %aN <%aE>%nCommitter %cn <%ce> maps to %cN <%cE>%n" >actual &&
 	test_cmp expect actual
 '
 
-cat >expect << EOF
-Author email cto@coompany.xx has local-part cto
-Committer email $GIT_COMMITTER_EMAIL has local-part $TEST_COMMITTER_LOCALNAME
+test_expect_success 'Log output (local-part email address)' '
+	cat >expect <<-EOF &&
+	Author email cto@coompany.xx has local-part cto
+	Committer email $GIT_COMMITTER_EMAIL has local-part $TEST_COMMITTER_LOCALNAME
 
-Author email me@company.xx has local-part me
-Committer email $GIT_COMMITTER_EMAIL has local-part $TEST_COMMITTER_LOCALNAME
+	Author email me@company.xx has local-part me
+	Committer email $GIT_COMMITTER_EMAIL has local-part $TEST_COMMITTER_LOCALNAME
 
-Author email me@company.xx has local-part me
-Committer email $GIT_COMMITTER_EMAIL has local-part $TEST_COMMITTER_LOCALNAME
+	Author email me@company.xx has local-part me
+	Committer email $GIT_COMMITTER_EMAIL has local-part $TEST_COMMITTER_LOCALNAME
 
-Author email nick2@company.xx has local-part nick2
-Committer email $GIT_COMMITTER_EMAIL has local-part $TEST_COMMITTER_LOCALNAME
+	Author email nick2@company.xx has local-part nick2
+	Committer email $GIT_COMMITTER_EMAIL has local-part $TEST_COMMITTER_LOCALNAME
 
-Author email bugs@company.xx has local-part bugs
-Committer email $GIT_COMMITTER_EMAIL has local-part $TEST_COMMITTER_LOCALNAME
+	Author email bugs@company.xx has local-part bugs
+	Committer email $GIT_COMMITTER_EMAIL has local-part $TEST_COMMITTER_LOCALNAME
 
-Author email bugs@company.xx has local-part bugs
-Committer email $GIT_COMMITTER_EMAIL has local-part $TEST_COMMITTER_LOCALNAME
+	Author email bugs@company.xx has local-part bugs
+	Committer email $GIT_COMMITTER_EMAIL has local-part $TEST_COMMITTER_LOCALNAME
 
-Author email author@example.com has local-part author
-Committer email $GIT_COMMITTER_EMAIL has local-part $TEST_COMMITTER_LOCALNAME
-EOF
+	Author email author@example.com has local-part author
+	Committer email $GIT_COMMITTER_EMAIL has local-part $TEST_COMMITTER_LOCALNAME
+	EOF
 
-test_expect_success 'Log output (local-part email address)' '
 	git log --pretty=format:"Author email %ae has local-part %al%nCommitter email %ce has local-part %cl%n" >actual &&
 	test_cmp expect actual
 '
 
-cat >expect << EOF
-Author: CTO <cto@company.xx>
-Author: Santa Claus <santa.claus@northpole.xx>
-Author: Santa Claus <santa.claus@northpole.xx>
-Author: Other Author <other@author.xx>
-Author: Other Author <other@author.xx>
-Author: Some Dude <some@dude.xx>
-Author: $GIT_AUTHOR_NAME <$GIT_AUTHOR_EMAIL>
-EOF
-
 test_expect_success 'Log output with --use-mailmap' '
-	git log --use-mailmap | grep Author >actual &&
+	test_config mailmap.file complex.map &&
+
+	cat >expect <<-EOF &&
+	Author: CTO <cto@company.xx>
+	Author: Santa Claus <santa.claus@northpole.xx>
+	Author: Santa Claus <santa.claus@northpole.xx>
+	Author: Other Author <other@author.xx>
+	Author: Other Author <other@author.xx>
+	Author: Some Dude <some@dude.xx>
+	Author: $GIT_AUTHOR_NAME <$GIT_AUTHOR_EMAIL>
+	EOF
+
+	git log --use-mailmap >log &&
+	grep Author log >actual &&
 	test_cmp expect actual
 '
 
-cat >expect << EOF
-Author: CTO <cto@company.xx>
-Author: Santa Claus <santa.claus@northpole.xx>
-Author: Santa Claus <santa.claus@northpole.xx>
-Author: Other Author <other@author.xx>
-Author: Other Author <other@author.xx>
-Author: Some Dude <some@dude.xx>
-Author: $GIT_AUTHOR_NAME <$GIT_AUTHOR_EMAIL>
-EOF
-
 test_expect_success 'Log output with log.mailmap' '
-	git -c log.mailmap=True log | grep Author >actual &&
+	test_config mailmap.file complex.map &&
+
+	cat >expect <<-EOF &&
+	Author: CTO <cto@company.xx>
+	Author: Santa Claus <santa.claus@northpole.xx>
+	Author: Santa Claus <santa.claus@northpole.xx>
+	Author: Other Author <other@author.xx>
+	Author: Other Author <other@author.xx>
+	Author: Some Dude <some@dude.xx>
+	Author: $GIT_AUTHOR_NAME <$GIT_AUTHOR_EMAIL>
+	EOF
+
+	git -c log.mailmap=True log >log &&
+	grep Author log >actual &&
 	test_cmp expect actual
 '
 
 test_expect_success 'log.mailmap=false disables mailmap' '
-	cat >expect <<- EOF &&
+	cat >expect <<-EOF &&
 	Author: CTO <cto@coompany.xx>
 	Author: claus <me@company.xx>
 	Author: santa <me@company.xx>
@@ -480,12 +670,13 @@ test_expect_success 'log.mailmap=false disables mailmap' '
 	Author: nick1 <bugs@company.xx>
 	Author: $GIT_AUTHOR_NAME <$GIT_AUTHOR_EMAIL>
 	EOF
-	git -c log.mailmap=False log | grep Author > actual &&
+	git -c log.mailmap=false log >log &&
+	grep Author log >actual &&
 	test_cmp expect actual
 '
 
 test_expect_success '--no-use-mailmap disables mailmap' '
-	cat >expect <<- EOF &&
+	cat >expect <<-EOF &&
 	Author: CTO <cto@coompany.xx>
 	Author: claus <me@company.xx>
 	Author: santa <me@company.xx>
@@ -494,64 +685,406 @@ test_expect_success '--no-use-mailmap disables mailmap' '
 	Author: nick1 <bugs@company.xx>
 	Author: $GIT_AUTHOR_NAME <$GIT_AUTHOR_EMAIL>
 	EOF
-	git log --no-use-mailmap | grep Author > actual &&
+	git log --no-use-mailmap >log &&
+	grep Author log >actual &&
 	test_cmp expect actual
 '
 
-cat >expect <<\EOF
-Author: Santa Claus <santa.claus@northpole.xx>
-Author: Santa Claus <santa.claus@northpole.xx>
-EOF
-
 test_expect_success 'Grep author with --use-mailmap' '
-	git log --use-mailmap --author Santa | grep Author >actual &&
+	test_config mailmap.file complex.map &&
+
+	cat >expect <<-\EOF &&
+	Author: Santa Claus <santa.claus@northpole.xx>
+	Author: Santa Claus <santa.claus@northpole.xx>
+	EOF
+	git log --use-mailmap --author Santa >log &&
+	grep Author log >actual &&
 	test_cmp expect actual
 '
-cat >expect <<\EOF
-Author: Santa Claus <santa.claus@northpole.xx>
-Author: Santa Claus <santa.claus@northpole.xx>
-EOF
 
 test_expect_success 'Grep author with log.mailmap' '
-	git -c log.mailmap=True log --author Santa | grep Author >actual &&
+	test_config mailmap.file complex.map &&
+
+	cat >expect <<-\EOF &&
+	Author: Santa Claus <santa.claus@northpole.xx>
+	Author: Santa Claus <santa.claus@northpole.xx>
+	EOF
+
+	git -c log.mailmap=True log --author Santa >log &&
+	grep Author log >actual &&
 	test_cmp expect actual
 '
 
 test_expect_success 'log.mailmap is true by default these days' '
-	git log --author Santa | grep Author >actual &&
+	test_config mailmap.file complex.map &&
+	git log --author Santa >log &&
+	grep Author log >actual &&
 	test_cmp expect actual
 '
 
 test_expect_success 'Only grep replaced author with --use-mailmap' '
+	test_config mailmap.file complex.map &&
 	git log --use-mailmap --author "<cto@coompany.xx>" >actual &&
 	test_must_be_empty actual
 '
 
-# git blame
-cat >expect <<EOF
-^OBJI ($GIT_AUTHOR_NAME     DATE 1) one
-OBJID (Some Dude    DATE 2) two
-OBJID (Other Author DATE 3) three
-OBJID (Other Author DATE 4) four
-OBJID (Santa Claus  DATE 5) five
-OBJID (Santa Claus  DATE 6) six
-OBJID (CTO          DATE 7) seven
-EOF
-test_expect_success 'Blame output (complex mapping)' '
-	git blame one >actual &&
-	fuzz_blame actual >actual.fuzz &&
+test_expect_success 'Blame --porcelain output (complex mapping)' '
+	test_config mailmap.file complex.map &&
+
+	cat >expect <<-EOF &&
+	1 1 1
+	A U Thor
+	2 2 1
+	Some Dude
+	3 3 1
+	Other Author
+	4 4 1
+	Other Author
+	5 5 1
+	Santa Claus
+	6 6 1
+	Santa Claus
+	7 7 1
+	CTO
+	EOF
+
+	git blame --porcelain one >actual.blame &&
+
+	NUM="[0-9][0-9]*" &&
+	sed -n <actual.blame >actual.fuzz \
+		-e "s/^author //p" \
+		-e "s/^$OID_REGEX \\($NUM $NUM $NUM\\)$/\\1/p"  &&
 	test_cmp expect actual.fuzz
 '
 
-cat >expect <<\EOF
-Some Dude <some@dude.xx>
-EOF
+test_expect_success 'Blame output (complex mapping)' '
+	git -c mailmap.file=complex.map blame one >a &&
+	git blame one >b &&
+	test_file_not_empty a &&
+	! cmp a b
+'
 
 test_expect_success 'commit --author honors mailmap' '
+	test_config mailmap.file complex.map &&
+
+	cat >expect <<-\EOF &&
+	Some Dude <some@dude.xx>
+	EOF
+
 	test_must_fail git commit --author "nick" --allow-empty -meight &&
 	git commit --author "Some Dude" --allow-empty -meight &&
 	git show --pretty=format:"%an <%ae>%n" >actual &&
 	test_cmp expect actual
 '
 
+test_expect_success 'comment syntax: setup' '
+	test_create_repo comm &&
+	test_commit -C comm --author "A <a@example.com>" A &&
+	test_commit -C comm --author "B <b@example.com>" B &&
+	test_commit -C comm --author "C <#@example.com>" C &&
+	test_commit -C comm --author "D <d@e#ample.com>" D &&
+
+	test_config -C comm mailmap.file ../doc.map &&
+	cat >>doc.map <<-\EOF &&
+	# Ah <a@example.com>
+
+	; Bee <b@example.com>
+	Cee <cee@example.com> <#@example.com>
+	Dee <dee@example.com> <d@e#ample.com>
+	EOF
+
+	cat >expect <<-\EOF &&
+	Author A <a@example.com> maps to A <a@example.com>
+	Committer C O Mitter <committer@example.com> maps to C O Mitter <committer@example.com>
+
+	Author B <b@example.com> maps to ; Bee <b@example.com>
+	Committer C O Mitter <committer@example.com> maps to C O Mitter <committer@example.com>
+
+	Author C <#@example.com> maps to Cee <cee@example.com>
+	Committer C O Mitter <committer@example.com> maps to C O Mitter <committer@example.com>
+
+	Author D <d@e#ample.com> maps to Dee <dee@example.com>
+	Committer C O Mitter <committer@example.com> maps to C O Mitter <committer@example.com>
+	EOF
+	git -C comm log --reverse --pretty=format:"Author %an <%ae> maps to %aN <%aE>%nCommitter %cn <%ce> maps to %cN <%cE>%n" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'whitespace syntax: setup' '
+	test_create_repo space &&
+	test_commit -C space --author "A <a@example.com>" A &&
+	test_commit -C space --author "B <b@example.com>" B &&
+	test_commit -C space --author " C <c@example.com>" C &&
+	test_commit -C space --author " D  <d@example.com>" D &&
+	test_commit -C space --author "E E <e@example.com>" E &&
+	test_commit -C space --author "F  F <f@example.com>" F &&
+	test_commit -C space --author "G   G <g@example.com>" G &&
+	test_commit -C space --author "H   H <h@example.com>" H &&
+
+	test_config -C space mailmap.file ../space.map &&
+	cat >>space.map <<-\EOF &&
+	Ah <ah@example.com> < a@example.com >
+	Bee <bee@example.com  > <  b@example.com  >
+	Cee <cee@example.com> C <c@example.com>
+	dee <dee@example.com>  D  <d@example.com>
+	eee <eee@example.com> E E <e@example.com>
+	eff <eff@example.com> F  F <f@example.com>
+	gee <gee@example.com> G   G <g@example.com>
+	aitch <aitch@example.com> H  H <h@example.com>
+	EOF
+
+	cat >expect <<-\EOF &&
+	Author A <a@example.com> maps to A <a@example.com>
+	Committer C O Mitter <committer@example.com> maps to C O Mitter <committer@example.com>
+
+	Author B <b@example.com> maps to B <b@example.com>
+	Committer C O Mitter <committer@example.com> maps to C O Mitter <committer@example.com>
+
+	Author C <c@example.com> maps to Cee <cee@example.com>
+	Committer C O Mitter <committer@example.com> maps to C O Mitter <committer@example.com>
+
+	Author D <d@example.com> maps to dee <dee@example.com>
+	Committer C O Mitter <committer@example.com> maps to C O Mitter <committer@example.com>
+
+	Author E E <e@example.com> maps to eee <eee@example.com>
+	Committer C O Mitter <committer@example.com> maps to C O Mitter <committer@example.com>
+
+	Author F  F <f@example.com> maps to eff <eff@example.com>
+	Committer C O Mitter <committer@example.com> maps to C O Mitter <committer@example.com>
+
+	Author G   G <g@example.com> maps to gee <gee@example.com>
+	Committer C O Mitter <committer@example.com> maps to C O Mitter <committer@example.com>
+
+	Author H   H <h@example.com> maps to H   H <h@example.com>
+	Committer C O Mitter <committer@example.com> maps to C O Mitter <committer@example.com>
+	EOF
+	git -C space log --reverse --pretty=format:"Author %an <%ae> maps to %aN <%aE>%nCommitter %cn <%ce> maps to %cN <%cE>%n" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'empty syntax: setup' '
+	test_create_repo empty &&
+	test_commit -C empty --author "A <>" A &&
+	test_commit -C empty --author "B <b@example.com>" B &&
+	test_commit -C empty --author "C <c@example.com>" C &&
+
+	test_config -C empty mailmap.file ../empty.map &&
+	cat >>empty.map <<-\EOF &&
+	Ah <ah@example.com> <>
+	Bee <bee@example.com> <>
+	Cee <> <c@example.com>
+	EOF
+
+	cat >expect <<-\EOF &&
+	Author A <> maps to Bee <bee@example.com>
+	Committer C O Mitter <committer@example.com> maps to C O Mitter <committer@example.com>
+
+	Author B <b@example.com> maps to B <b@example.com>
+	Committer C O Mitter <committer@example.com> maps to C O Mitter <committer@example.com>
+
+	Author C <c@example.com> maps to C <c@example.com>
+	Committer C O Mitter <committer@example.com> maps to C O Mitter <committer@example.com>
+	EOF
+	git -C empty log --reverse --pretty=format:"Author %an <%ae> maps to %aN <%aE>%nCommitter %cn <%ce> maps to %cN <%cE>%n" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'set up mailmap location tests' '
+	git init --bare loc-bare &&
+	git --git-dir=loc-bare --work-tree=. commit \
+		--allow-empty -m foo --author="Orig <orig@example.com>" &&
+	echo "New <new@example.com> <orig@example.com>" >loc-bare/.mailmap
+'
+
+test_expect_success 'bare repo with --work-tree finds mailmap at top-level' '
+	git -C loc-bare --work-tree=. log -1 --format=%aE >actual &&
+	echo new@example.com >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'bare repo does not look in current directory' '
+	git -C loc-bare log -1 --format=%aE >actual &&
+	echo orig@example.com >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'non-git shortlog respects mailmap in current dir' '
+	git --git-dir=loc-bare log -1 >input &&
+	nongit cp "$TRASH_DIRECTORY/loc-bare/.mailmap" . &&
+	nongit git shortlog -s <input >actual &&
+	echo "     1	New" >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'shortlog on stdin respects mailmap from repo' '
+	cp loc-bare/.mailmap . &&
+	git shortlog -s <input >actual &&
+	echo "     1	New" >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'find top-level mailmap from subdir' '
+	git clone loc-bare loc-wt &&
+	cp loc-bare/.mailmap loc-wt &&
+	mkdir loc-wt/subdir &&
+	git -C loc-wt/subdir log -1 --format=%aE >actual &&
+	echo new@example.com >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success SYMLINKS 'set up symlink tests' '
+	git commit --allow-empty -m foo --author="Orig <orig@example.com>" &&
+	echo "New <new@example.com> <orig@example.com>" >map &&
+	rm -f .mailmap
+'
+
+test_expect_success SYMLINKS 'symlinks respected in mailmap.file' '
+	test_when_finished "rm symlink" &&
+	ln -s map symlink &&
+	git -c mailmap.file="$(pwd)/symlink" log -1 --format=%aE >actual &&
+	echo "new@example.com" >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success SYMLINKS 'symlinks respected in non-repo shortlog' '
+	git log -1 >input &&
+	test_when_finished "nongit rm .mailmap" &&
+	nongit ln -sf "$TRASH_DIRECTORY/map" .mailmap &&
+	nongit git shortlog -s <input >actual &&
+	echo "     1	New" >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success SYMLINKS 'symlinks not respected in-tree' '
+	test_when_finished "rm .mailmap" &&
+	ln -s map .mailmap &&
+	git log -1 --format=%aE >actual &&
+	echo "orig@example.com" >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'prepare for cat-file --mailmap' '
+	rm -f .mailmap &&
+	git commit --allow-empty -m foo --author="Orig <orig@example.com>"
+'
+
+test_expect_success '--no-use-mailmap disables mailmap in cat-file' '
+	test_when_finished "rm .mailmap" &&
+	cat >.mailmap <<-EOF &&
+	A U Thor <author@example.com> Orig <orig@example.com>
+	EOF
+	cat >expect <<-EOF &&
+	author Orig <orig@example.com>
+	EOF
+	git cat-file --no-use-mailmap commit HEAD >log &&
+	sed -n "/^author /s/\([^>]*>\).*/\1/p" log >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success '--use-mailmap enables mailmap in cat-file' '
+	test_when_finished "rm .mailmap" &&
+	cat >.mailmap <<-EOF &&
+	A U Thor <author@example.com> Orig <orig@example.com>
+	EOF
+	cat >expect <<-EOF &&
+	author A U Thor <author@example.com>
+	EOF
+	git cat-file --use-mailmap commit HEAD >log &&
+	sed -n "/^author /s/\([^>]*>\).*/\1/p" log >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success '--no-mailmap disables mailmap in cat-file for annotated tag objects' '
+	test_when_finished "rm .mailmap" &&
+	cat >.mailmap <<-EOF &&
+	Orig <orig@example.com> C O Mitter <committer@example.com>
+	EOF
+	cat >expect <<-EOF &&
+	tagger C O Mitter <committer@example.com>
+	EOF
+	git tag -a -m "annotated tag" v1 &&
+	git cat-file --no-mailmap -p v1 >log &&
+	sed -n "/^tagger /s/\([^>]*>\).*/\1/p" log >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success '--mailmap enables mailmap in cat-file for annotated tag objects' '
+	test_when_finished "rm .mailmap" &&
+	cat >.mailmap <<-EOF &&
+	Orig <orig@example.com> C O Mitter <committer@example.com>
+	EOF
+	cat >expect <<-EOF &&
+	tagger Orig <orig@example.com>
+	EOF
+	git tag -a -m "annotated tag" v2 &&
+	git cat-file --mailmap -p v2 >log &&
+	sed -n "/^tagger /s/\([^>]*>\).*/\1/p" log >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'git cat-file -s returns correct size with --use-mailmap' '
+	test_when_finished "rm .mailmap" &&
+	cat >.mailmap <<-\EOF &&
+	C O Mitter <committer@example.com> Orig <orig@example.com>
+	EOF
+	git cat-file commit HEAD >commit.out &&
+	echo $(wc -c <commit.out) >expect &&
+	git cat-file --use-mailmap commit HEAD >commit.out &&
+	echo $(wc -c <commit.out) >>expect &&
+	git cat-file -s HEAD >actual &&
+	git cat-file --use-mailmap -s HEAD >>actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'git cat-file -s returns correct size with --use-mailmap for tag objects' '
+	test_when_finished "rm .mailmap" &&
+	cat >.mailmap <<-\EOF &&
+	Orig <orig@example.com> C O Mitter <committer@example.com>
+	EOF
+	git tag -a -m "annotated tag" v3 &&
+	git cat-file tag v3 >tag.out &&
+	echo $(wc -c <tag.out) >expect &&
+	git cat-file --use-mailmap tag v3 >tag.out &&
+	echo $(wc -c <tag.out) >>expect &&
+	git cat-file -s v3 >actual &&
+	git cat-file --use-mailmap -s v3 >>actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'git cat-file --batch-check returns correct size with --use-mailmap' '
+	test_when_finished "rm .mailmap" &&
+	cat >.mailmap <<-\EOF &&
+	C O Mitter <committer@example.com> Orig <orig@example.com>
+	EOF
+	git cat-file commit HEAD >commit.out &&
+	commit_size=$(wc -c <commit.out) &&
+	commit_sha=$(git rev-parse HEAD) &&
+	echo $commit_sha commit $commit_size >expect &&
+	git cat-file --use-mailmap commit HEAD >commit.out &&
+	commit_size=$(wc -c <commit.out) &&
+	echo $commit_sha commit $commit_size >>expect &&
+	echo "HEAD" >in &&
+	git cat-file --batch-check <in >actual &&
+	git cat-file --use-mailmap --batch-check <in >>actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'git cat-file --batch-command returns correct size with --use-mailmap' '
+	test_when_finished "rm .mailmap" &&
+	cat >.mailmap <<-\EOF &&
+	C O Mitter <committer@example.com> Orig <orig@example.com>
+	EOF
+	git cat-file commit HEAD >commit.out &&
+	commit_size=$(wc -c <commit.out) &&
+	commit_sha=$(git rev-parse HEAD) &&
+	echo $commit_sha commit $commit_size >expect &&
+	git cat-file --use-mailmap commit HEAD >commit.out &&
+	commit_size=$(wc -c <commit.out) &&
+	echo $commit_sha commit $commit_size >>expect &&
+	echo "info HEAD" >in &&
+	git cat-file --batch-command <in >actual &&
+	git cat-file --use-mailmap --batch-command <in >>actual &&
+	test_cmp expect actual
+'
+
 test_done
diff --git a/t/t4204-patch-id.sh b/t/t4204-patch-id.sh
index 8ff8bd8..a7fa94c 100755
--- a/t/t4204-patch-id.sh
+++ b/t/t4204-patch-id.sh
@@ -2,29 +2,48 @@
 
 test_description='git patch-id'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 test_expect_success 'setup' '
-	as="a a a a a a a a" && # eight a
-	test_write_lines $as >foo &&
-	test_write_lines $as >bar &&
+	str="ab cd ef gh ij kl mn op" &&
+	test_write_lines $str >foo &&
+	test_write_lines $str >bar &&
 	git add foo bar &&
 	git commit -a -m initial &&
-	test_write_lines $as b >foo &&
-	test_write_lines $as b >bar &&
+	test_write_lines $str b >foo &&
+	test_write_lines $str b >bar &&
 	git commit -a -m first &&
-	git checkout -b same master &&
+	git checkout -b same main &&
 	git commit --amend -m same-msg &&
-	git checkout -b notsame master &&
+	git checkout -b notsame main &&
 	echo c >foo &&
 	echo c >bar &&
 	git commit --amend -a -m notsame-msg &&
+	git checkout -b with_space main~ &&
+	cat >foo <<-\EOF &&
+	a  b
+	c d
+	e    f
+	  g   h
+	    i   j
+	k l
+	m   n
+	op
+	EOF
+	cp foo bar &&
+	git add foo bar &&
+	git commit --amend -m "with spaces" &&
 	test_write_lines bar foo >bar-then-foo &&
 	test_write_lines foo bar >foo-then-bar
+
 '
 
 test_expect_success 'patch-id output is well-formed' '
-	git log -p -1 | git patch-id >output &&
+	git log -p -1 >log.output &&
+	git patch-id <log.output >output &&
 	grep "^$OID_REGEX $(git rev-parse HEAD)$" output
 '
 
@@ -32,45 +51,75 @@ test_expect_success 'patch-id output is well-formed' '
 calc_patch_id () {
 	patch_name="$1"
 	shift
-	git patch-id "$@" |
-	sed "s/ .*//" >patch-id_"$patch_name" &&
-	test_line_count -gt 0 patch-id_"$patch_name"
+	git patch-id "$@" >patch-id.output &&
+	sed "s/ .*//" patch-id.output >patch-id_"$patch_name" &&
+	test_line_count -eq 1 patch-id_"$patch_name"
 }
 
 get_top_diff () {
-	git log -p -1 "$@" -O bar-then-foo --
+	git log -p -1 "$@" -O bar-then-foo --full-index --
 }
 
 get_patch_id () {
-	get_top_diff "$1" | calc_patch_id "$@"
+	get_top_diff "$1" >top-diff.output &&
+	calc_patch_id <top-diff.output "$@"
 }
 
 test_expect_success 'patch-id detects equality' '
-	get_patch_id master &&
+	get_patch_id main &&
 	get_patch_id same &&
-	test_cmp patch-id_master patch-id_same
+	test_cmp patch-id_main patch-id_same
 '
 
 test_expect_success 'patch-id detects inequality' '
-	get_patch_id master &&
+	get_patch_id main &&
+	get_patch_id notsame &&
+	! test_cmp patch-id_main patch-id_notsame
+'
+test_expect_success 'patch-id detects equality binary' '
+	cat >.gitattributes <<-\EOF &&
+	foo binary
+	bar binary
+	EOF
+	get_patch_id main &&
+	get_patch_id same &&
+	git log -p -1 --binary main >top-diff.output &&
+	calc_patch_id <top-diff.output main_binpatch &&
+	git log -p -1 --binary same >top-diff.output &&
+	calc_patch_id <top-diff.output same_binpatch &&
+	test_cmp patch-id_main patch-id_main_binpatch &&
+	test_cmp patch-id_same patch-id_same_binpatch &&
+	test_cmp patch-id_main patch-id_same &&
+	test_when_finished "rm .gitattributes"
+'
+
+test_expect_success 'patch-id detects inequality binary' '
+	cat >.gitattributes <<-\EOF &&
+	foo binary
+	bar binary
+	EOF
+	get_patch_id main &&
 	get_patch_id notsame &&
-	! test_cmp patch-id_master patch-id_notsame
+	! test_cmp patch-id_main patch-id_notsame &&
+	test_when_finished "rm .gitattributes"
 '
 
 test_expect_success 'patch-id supports git-format-patch output' '
-	get_patch_id master &&
+	get_patch_id main &&
 	git checkout same &&
-	git format-patch -1 --stdout | calc_patch_id same &&
-	test_cmp patch-id_master patch-id_same &&
-	set $(git format-patch -1 --stdout | git patch-id) &&
+	git format-patch -1 --stdout >format-patch.output &&
+	calc_patch_id same <format-patch.output &&
+	test_cmp patch-id_main patch-id_same &&
+	set $(git patch-id <format-patch.output) &&
 	test "$2" = $(git rev-parse HEAD)
 '
 
 test_expect_success 'whitespace is irrelevant in footer' '
-	get_patch_id master &&
+	get_patch_id main &&
 	git checkout same &&
-	git format-patch -1 --stdout | sed "s/ \$//" | calc_patch_id same &&
-	test_cmp patch-id_master patch-id_same
+	git format-patch -1 --stdout >format-patch.output &&
+	sed "s/ \$//" format-patch.output | calc_patch_id same &&
+	test_cmp patch-id_main patch-id_same
 '
 
 cmp_patch_id () {
@@ -88,14 +137,27 @@ test_patch_id_file_order () {
 	shift
 	name="order-${1}-$relevant"
 	shift
-	get_top_diff "master" | calc_patch_id "$name" "$@" &&
+	get_top_diff "main" >top-diff.output &&
+	calc_patch_id <top-diff.output "$name" "$@" &&
 	git checkout same &&
-	git format-patch -1 --stdout -O foo-then-bar |
-		calc_patch_id "ordered-$name" "$@" &&
+	git format-patch -1 --stdout -O foo-then-bar >format-patch.output &&
+	calc_patch_id <format-patch.output "ordered-$name" "$@" &&
 	cmp_patch_id $relevant "$name" "ordered-$name"
+}
 
+test_patch_id_whitespace () {
+	relevant="$1"
+	shift
+	name="ws-${1}-$relevant"
+	shift
+	get_top_diff "main~" >top-diff.output &&
+	calc_patch_id <top-diff.output "$name" "$@" &&
+	get_top_diff "with_space" >top-diff.output &&
+	calc_patch_id <top-diff.output "ws-$name" "$@" &&
+	cmp_patch_id $relevant "$name" "ws-$name"
 }
 
+
 # combined test for options: add more tests here to make them
 # run with all options
 test_patch_id () {
@@ -111,6 +173,14 @@ test_expect_success 'file order is relevant with --unstable' '
 	test_patch_id_file_order relevant --unstable --unstable
 '
 
+test_expect_success 'whitespace is relevant with --verbatim' '
+	test_patch_id_whitespace relevant --verbatim --verbatim
+'
+
+test_expect_success 'whitespace is irrelevant without --verbatim' '
+	test_patch_id_whitespace irrelevant --stable --stable
+'
+
 #Now test various option combinations.
 test_expect_success 'default is unstable' '
 	test_patch_id relevant default
@@ -126,6 +196,17 @@ test_expect_success 'patchid.stable = false is unstable' '
 	test_patch_id relevant patchid.stable=false
 '
 
+test_expect_success 'patchid.verbatim = true is correct and stable' '
+	test_config patchid.verbatim true &&
+	test_patch_id_whitespace relevant patchid.verbatim=true &&
+	test_patch_id irrelevant patchid.verbatim=true
+'
+
+test_expect_success 'patchid.verbatim = false is unstable' '
+	test_config patchid.verbatim false &&
+	test_patch_id relevant patchid.verbatim=false
+'
+
 test_expect_success '--unstable overrides patchid.stable = true' '
 	test_config patchid.stable true &&
 	test_patch_id relevant patchid.stable=true--unstable --unstable
@@ -136,11 +217,17 @@ test_expect_success '--stable overrides patchid.stable = false' '
 	test_patch_id irrelevant patchid.stable=false--stable --stable
 '
 
+test_expect_success '--verbatim overrides patchid.stable = false' '
+	test_config patchid.stable false &&
+	test_patch_id_whitespace relevant stable=false--verbatim --verbatim
+'
+
 test_expect_success 'patch-id supports git-format-patch MIME output' '
-	get_patch_id master &&
+	get_patch_id main &&
 	git checkout same &&
-	git format-patch -1 --attach --stdout | calc_patch_id same &&
-	test_cmp patch-id_master patch-id_same
+	git format-patch -1 --attach --stdout >format-patch.output &&
+	calc_patch_id <format-patch.output same &&
+	test_cmp patch-id_main patch-id_same
 '
 
 test_expect_success 'patch-id respects config from subdir' '
@@ -157,40 +244,70 @@ test_expect_success 'patch-id respects config from subdir' '
 	)
 '
 
-cat >nonl <<\EOF
-diff --git i/a w/a
-index e69de29..2e65efe 100644
---- i/a
-+++ w/a
-@@ -0,0 +1 @@
-+a
-\ No newline at end of file
-diff --git i/b w/b
-index e69de29..6178079 100644
---- i/b
-+++ w/b
-@@ -0,0 +1 @@
-+b
-EOF
-
-cat >withnl <<\EOF
-diff --git i/a w/a
-index e69de29..7898192 100644
---- i/a
-+++ w/a
-@@ -0,0 +1 @@
-+a
-diff --git i/b w/b
-index e69de29..6178079 100644
---- i/b
-+++ w/b
-@@ -0,0 +1 @@
-+b
-EOF
-
 test_expect_success 'patch-id handles no-nl-at-eof markers' '
-	cat nonl | calc_patch_id nonl &&
-	cat withnl | calc_patch_id withnl &&
-	test_cmp patch-id_nonl patch-id_withnl
+	cat >nonl <<-\EOF &&
+	diff --git i/a w/a
+	index e69de29..2e65efe 100644
+	--- i/a
+	+++ w/a
+	@@ -0,0 +1 @@
+	+a
+	\ No newline at end of file
+	diff --git i/b w/b
+	index e69de29..6178079 100644
+	--- i/b
+	+++ w/b
+	@@ -0,0 +1 @@
+	+b
+	EOF
+	cat >withnl <<-\EOF &&
+	diff --git i/a w/a
+	index e69de29..7898192 100644
+	--- i/a
+	+++ w/a
+	@@ -0,0 +1 @@
+	+a
+	diff --git i/b w/b
+	index e69de29..6178079 100644
+	--- i/b
+	+++ w/b
+	@@ -0,0 +1 @@
+	+b
+	EOF
+	calc_patch_id nonl <nonl &&
+	calc_patch_id withnl <withnl &&
+	test_cmp patch-id_nonl patch-id_withnl &&
+	calc_patch_id nonl-inc-ws --verbatim <nonl &&
+	calc_patch_id withnl-inc-ws --verbatim <withnl &&
+	! test_cmp patch-id_nonl-inc-ws patch-id_withnl-inc-ws
+'
+
+test_expect_success 'patch-id handles diffs with one line of before/after' '
+	cat >diffu1 <<-\EOF &&
+	diff --git a/bar b/bar
+	index bdaf90f..31051f6 100644
+	--- a/bar
+	+++ b/bar
+	@@ -2 +2,2 @@
+	 b
+	+c
+	diff --git a/car b/car
+	index 00750ed..2ae5e34 100644
+	--- a/car
+	+++ b/car
+	@@ -1 +1,2 @@
+	 3
+	+d
+	diff --git a/foo b/foo
+	index e439850..7146eb8 100644
+	--- a/foo
+	+++ b/foo
+	@@ -2 +2,2 @@
+	 a
+	+e
+	EOF
+	calc_patch_id diffu1 <diffu1 &&
+	test_config patchid.stable true &&
+	calc_patch_id diffu1stable <diffu1
 '
 test_done
diff --git a/t/t4205-log-pretty-formats.sh b/t/t4205-log-pretty-formats.sh
index 204c149..158b49d 100755
--- a/t/t4205-log-pretty-formats.sh
+++ b/t/t4205-log-pretty-formats.sh
@@ -30,40 +30,46 @@ test_expect_success 'set up basic repos' '
 	>bar &&
 	git add foo &&
 	test_tick &&
-	git config i18n.commitEncoding $test_encoding &&
+	test_config i18n.commitEncoding $test_encoding &&
 	commit_msg $test_encoding | git commit -F - &&
 	git add bar &&
 	test_tick &&
-	git commit -m "add bar" &&
-	git config --unset i18n.commitEncoding
+	git commit -m "add bar"
 '
 
 test_expect_success 'alias builtin format' '
 	git log --pretty=oneline >expected &&
-	git config pretty.test-alias oneline &&
+	test_config pretty.test-alias oneline &&
 	git log --pretty=test-alias >actual &&
 	test_cmp expected actual
 '
 
 test_expect_success 'alias masking builtin format' '
 	git log --pretty=oneline >expected &&
-	git config pretty.oneline "%H" &&
+	test_config pretty.oneline "%H" &&
 	git log --pretty=oneline >actual &&
 	test_cmp expected actual
 '
 
 test_expect_success 'alias user-defined format' '
 	git log --pretty="format:%h" >expected &&
-	git config pretty.test-alias "format:%h" &&
+	test_config pretty.test-alias "format:%h" &&
 	git log --pretty=test-alias >actual &&
 	test_cmp expected actual
 '
 
+test_expect_success 'alias user-defined format is matched case-insensitively' '
+	git log --pretty="format:%h" >expected &&
+	test_config pretty.testone "format:%h" &&
+	test_config pretty.testtwo testOne &&
+	git log --pretty=testTwo >actual &&
+	test_cmp expected actual
+'
+
 test_expect_success 'alias user-defined tformat with %s (ISO8859-1 encoding)' '
-	git config i18n.logOutputEncoding $test_encoding &&
+	test_config i18n.logOutputEncoding $test_encoding &&
 	git log --oneline >expected-s &&
 	git log --pretty="tformat:%h %s" >actual-s &&
-	git config --unset i18n.logOutputEncoding &&
 	test_cmp expected-s actual-s
 '
 
@@ -75,34 +81,34 @@ test_expect_success 'alias user-defined tformat with %s (utf-8 encoding)' '
 
 test_expect_success 'alias user-defined tformat' '
 	git log --pretty="tformat:%h" >expected &&
-	git config pretty.test-alias "tformat:%h" &&
+	test_config pretty.test-alias "tformat:%h" &&
 	git log --pretty=test-alias >actual &&
 	test_cmp expected actual
 '
 
 test_expect_success 'alias non-existent format' '
-	git config pretty.test-alias format-that-will-never-exist &&
+	test_config pretty.test-alias format-that-will-never-exist &&
 	test_must_fail git log --pretty=test-alias
 '
 
 test_expect_success 'alias of an alias' '
 	git log --pretty="tformat:%h" >expected &&
-	git config pretty.test-foo "tformat:%h" &&
-	git config pretty.test-bar test-foo &&
+	test_config pretty.test-foo "tformat:%h" &&
+	test_config pretty.test-bar test-foo &&
 	git log --pretty=test-bar >actual && test_cmp expected actual
 '
 
 test_expect_success 'alias masking an alias' '
 	git log --pretty=format:"Two %H" >expected &&
-	git config pretty.duplicate "format:One %H" &&
-	git config --add pretty.duplicate "format:Two %H" &&
+	test_config pretty.duplicate "format:One %H" &&
+	test_config pretty.duplicate "format:Two %H" --add &&
 	git log --pretty=duplicate >actual &&
 	test_cmp expected actual
 '
 
 test_expect_success 'alias loop' '
-	git config pretty.test-foo test-bar &&
-	git config pretty.test-bar test-foo &&
+	test_config pretty.test-foo test-bar &&
+	test_config pretty.test-bar test-foo &&
 	test_must_fail git log --pretty=test-foo
 '
 
@@ -123,10 +129,10 @@ test_expect_success 'NUL separation with --stat' '
 	stat1_part=$(git diff-tree --no-commit-id --stat --root HEAD^) &&
 	printf "add bar\n$stat0_part\n\0$(commit_msg)\n$stat1_part\n" >expected &&
 	git log -z --stat --pretty="format:%s" >actual &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
-test_expect_failure C_LOCALE_OUTPUT 'NUL termination with --stat' '
+test_expect_failure 'NUL termination with --stat' '
 	stat0_part=$(git diff --stat HEAD^ HEAD) &&
 	stat1_part=$(git diff-tree --no-commit-id --stat --root HEAD^) &&
 	printf "add bar\n$stat0_part\n\0$(commit_msg)\n$stat1_part\n0" >expected &&
@@ -156,7 +162,7 @@ test_expect_success 'NUL termination with --reflog --pretty=oneline' '
 	for r in $revs
 	do
 		git show -s --pretty=oneline "$r" >raw &&
-		cat raw | lf_to_nul || exit 1
+		lf_to_nul <raw || return 1
 	done >expect &&
 	# the trailing NUL is already produced so we do not need to
 	# output another one
@@ -525,20 +531,25 @@ test_expect_success 'strbuf_utf8_replace() not producing NUL' '
 	! grep Q actual
 '
 
-# ISO strict date format
-test_expect_success 'ISO and ISO-strict date formats display the same values' '
-	git log --format=%ai%n%ci |
-	sed -e "s/ /T/; s/ //; s/..\$/:&/" >expected &&
+# --date=[XXX] and corresponding %a[X] %c[X] format equivalency
+test_expect_success '--date=iso-strict %ad%cd is the same as %aI%cI' '
+	git log --format=%ad%n%cd --date=iso-strict >expected &&
 	git log --format=%aI%n%cI >actual &&
 	test_cmp expected actual
 '
 
-test_expect_success 'short date' '
+test_expect_success '--date=short %ad%cd is the same as %as%cs' '
 	git log --format=%ad%n%cd --date=short >expected &&
 	git log --format=%as%n%cs >actual &&
 	test_cmp expected actual
 '
 
+test_expect_success '--date=human %ad%cd is the same as %ah%ch' '
+	git log --format=%ad%n%cd --date=human >expected &&
+	git log --format=%ah%n%ch >actual &&
+	test_cmp expected actual
+'
+
 # get new digests (with no abbreviations)
 test_expect_success 'set up log decoration tests' '
 	head1=$(git rev-parse --verify HEAD~0) &&
@@ -571,6 +582,38 @@ test_expect_success 'clean log decoration' '
 	test_cmp expected actual1
 '
 
+test_expect_success 'pretty format %decorate' '
+	git checkout -b foo &&
+	git commit --allow-empty -m "new commit" &&
+	git tag bar &&
+	git branch qux &&
+
+	echo " (HEAD -> foo, tag: bar, qux)" >expect1 &&
+	git log --format="%(decorate)" -1 >actual1 &&
+	test_cmp expect1 actual1 &&
+
+	echo "HEAD -> foo, tag: bar, qux" >expect2 &&
+	git log --format="%(decorate:prefix=,suffix=)" -1 >actual2 &&
+	test_cmp expect2 actual2 &&
+
+	echo "[ bar; qux; foo ]" >expect3 &&
+	git log --format="%(decorate:prefix=[ ,suffix= ],separator=%x3B ,tag=)" \
+		--decorate-refs=refs/ -1 >actual3 &&
+	test_cmp expect3 actual3 &&
+
+	# Try with a typo (in "separator"), in which case the placeholder should
+	# not be replaced.
+	echo "%(decorate:prefix=[ ,suffix= ],separater=; )" >expect4 &&
+	git log --format="%(decorate:prefix=[ ,suffix= ],separater=%x3B )" \
+		-1 >actual4 &&
+	test_cmp expect4 actual4 &&
+
+	echo "HEAD->foo bar qux" >expect5 &&
+	git log --format="%(decorate:prefix=,suffix=,separator= ,tag=,pointer=->)" \
+		-1 >actual5 &&
+	test_cmp expect5 actual5
+'
+
 cat >trailers <<EOF
 Signed-off-by: A U Thor <author@example.com>
 Acked-by: A U Thor <author@example.com>
@@ -605,6 +648,12 @@ test_expect_success 'pretty format %(trailers) shows trailers' '
 	test_cmp expect actual
 '
 
+test_expect_success 'pretty format %(trailers:) enables no options' '
+	git log --no-walk --pretty="%(trailers:)" >actual &&
+	# "expect" the same as the test above
+	test_cmp expect actual
+'
+
 test_expect_success '%(trailers:only) shows only "key: value" trailers' '
 	git log --no-walk --pretty="%(trailers:only)" >actual &&
 	{
@@ -709,19 +758,101 @@ test_expect_success '%(trailers:key) without value is error' '
 	test_cmp expect actual
 '
 
+test_expect_success '%(trailers:keyonly) shows only keys' '
+	git log --no-walk --pretty="format:%(trailers:keyonly)" >actual &&
+	test_write_lines \
+		"Signed-off-by" \
+		"Acked-by" \
+		"[ v2 updated patch description ]" \
+		"Signed-off-by" >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success '%(trailers:key=foo,keyonly) shows only key' '
+	git log --no-walk --pretty="format:%(trailers:key=Acked-by,keyonly)" >actual &&
+	echo "Acked-by" >expect &&
+	test_cmp expect actual
+'
+
 test_expect_success '%(trailers:key=foo,valueonly) shows only value' '
 	git log --no-walk --pretty="format:%(trailers:key=Acked-by,valueonly)" >actual &&
 	echo "A U Thor <author@example.com>" >expect &&
 	test_cmp expect actual
 '
 
+test_expect_success '%(trailers:valueonly) shows only values' '
+	git log --no-walk --pretty="format:%(trailers:valueonly)" >actual &&
+	test_write_lines \
+		"A U Thor <author@example.com>" \
+		"A U Thor <author@example.com>" \
+		"[ v2 updated patch description ]" \
+		"A U Thor" \
+		"  <author@example.com>" >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success '%(trailers:key=foo,keyonly,valueonly) shows nothing' '
+	git log --no-walk --pretty="format:%(trailers:key=Acked-by,keyonly,valueonly)" >actual &&
+	echo >expect &&
+	test_cmp expect actual
+'
+
 test_expect_success 'pretty format %(trailers:separator) changes separator' '
+	git log --no-walk --pretty=format:"X%(trailers:separator=%x00)X" >actual &&
+	(
+		printf "XSigned-off-by: A U Thor <author@example.com>\0" &&
+		printf "Acked-by: A U Thor <author@example.com>\0" &&
+		printf "[ v2 updated patch description ]\0" &&
+		printf "Signed-off-by: A U Thor\n  <author@example.com>X"
+	) >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'pretty format %(trailers:separator=X,unfold) changes separator' '
 	git log --no-walk --pretty=format:"X%(trailers:separator=%x00,unfold)X" >actual &&
-	printf "XSigned-off-by: A U Thor <author@example.com>\0Acked-by: A U Thor <author@example.com>\0[ v2 updated patch description ]\0Signed-off-by: A U Thor <author@example.com>X" >expect &&
+	(
+		printf "XSigned-off-by: A U Thor <author@example.com>\0" &&
+		printf "Acked-by: A U Thor <author@example.com>\0" &&
+		printf "[ v2 updated patch description ]\0" &&
+		printf "Signed-off-by: A U Thor <author@example.com>X"
+	) >expect &&
 	test_cmp expect actual
 '
 
-test_expect_success 'pretty format %(trailers) combining separator/key/valueonly' '
+test_expect_success 'pretty format %(trailers:key_value_separator) changes key-value separator' '
+	git log --no-walk --pretty=format:"X%(trailers:key_value_separator=%x00)X" >actual &&
+	(
+		printf "XSigned-off-by\0A U Thor <author@example.com>\n" &&
+		printf "Acked-by\0A U Thor <author@example.com>\n" &&
+		printf "[ v2 updated patch description ]\n" &&
+		printf "Signed-off-by\0A U Thor\n  <author@example.com>\nX"
+	) >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'pretty format %(trailers:key_value_separator,unfold) changes key-value separator' '
+	git log --no-walk --pretty=format:"X%(trailers:key_value_separator=%x00,unfold)X" >actual &&
+	(
+		printf "XSigned-off-by\0A U Thor <author@example.com>\n" &&
+		printf "Acked-by\0A U Thor <author@example.com>\n" &&
+		printf "[ v2 updated patch description ]\n" &&
+		printf "Signed-off-by\0A U Thor <author@example.com>\nX"
+	) >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'pretty format %(trailers:separator,key_value_separator) changes both separators' '
+	git log --no-walk --pretty=format:"%(trailers:separator=%x00,key_value_separator=%x00%x00,unfold)" >actual &&
+	(
+		printf "Signed-off-by\0\0A U Thor <author@example.com>\0" &&
+		printf "Acked-by\0\0A U Thor <author@example.com>\0" &&
+		printf "[ v2 updated patch description ]\0" &&
+		printf "Signed-off-by\0\0A U Thor <author@example.com>"
+	) >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'pretty format %(trailers) combining separator/key/keyonly/valueonly' '
 	git commit --allow-empty -F - <<-\EOF &&
 	Important fix
 
@@ -748,6 +879,13 @@ test_expect_success 'pretty format %(trailers) combining separator/key/valueonly
 		"Does not close any tickets" \
 		"Another fix #567, #890" \
 		"Important fix #1234" >expect &&
+	test_cmp expect actual &&
+
+	git log --pretty="%s% (trailers:separator=%x2c%x20,key=Closes,keyonly)" HEAD~3.. >actual &&
+	test_write_lines \
+		"Does not close any tickets" \
+		"Another fix Closes, Closes" \
+		"Important fix Closes" >expect &&
 	test_cmp expect actual
 '
 
@@ -824,6 +962,36 @@ test_expect_success '%S in git log --format works with other placeholders (part
 	test_cmp expect actual
 '
 
+test_expect_success 'setup more commits for %S with --bisect' '
+	test_commit four &&
+	test_commit five &&
+
+	head1=$(git rev-parse --verify HEAD~0) &&
+	head2=$(git rev-parse --verify HEAD~1) &&
+	head3=$(git rev-parse --verify HEAD~2) &&
+	head4=$(git rev-parse --verify HEAD~3)
+'
+
+test_expect_success '%S with --bisect labels commits with refs/bisect/bad ref' '
+	git update-ref refs/bisect/bad-$head1 $head1 &&
+	git update-ref refs/bisect/go $head1 &&
+	git update-ref refs/bisect/bad-$head2 $head2 &&
+	git update-ref refs/bisect/b $head3 &&
+	git update-ref refs/bisect/bad-$head4 $head4 &&
+	git update-ref refs/bisect/good-$head4 $head4 &&
+
+	# We expect to see the range of commits betwee refs/bisect/good-$head4
+	# and refs/bisect/bad-$head1. The "source" ref is the nearest bisect ref
+	# from which the commit is reachable.
+	cat >expect <<-EOF &&
+	$head1 refs/bisect/bad-$head1
+	$head2 refs/bisect/bad-$head2
+	$head3 refs/bisect/bad-$head2
+	EOF
+	git log --bisect --format="%H %S" >actual &&
+	test_cmp expect actual
+'
+
 test_expect_success 'log --pretty=reference' '
 	git log --pretty="tformat:%h (%s, %as)" >expect &&
 	git log --pretty=reference >actual &&
@@ -867,4 +1035,173 @@ test_expect_success 'log --pretty=reference is colored appropriately' '
 	test_cmp expect actual
 '
 
+test_expect_success '%(describe) vs git describe' '
+	git log --format="%H" | while read hash
+	do
+		if desc=$(git describe $hash)
+		then
+			: >expect-contains-good
+		else
+			: >expect-contains-bad
+		fi &&
+		echo "$hash $desc" || return 1
+	done >expect &&
+	test_path_exists expect-contains-good &&
+	test_path_exists expect-contains-bad &&
+
+	git log --format="%H %(describe)" >actual 2>err &&
+	test_cmp expect actual &&
+	test_must_be_empty err
+'
+
+test_expect_success '%(describe:match=...) vs git describe --match ...' '
+	test_when_finished "git tag -d tag-match" &&
+	git tag -a -m tagged tag-match &&
+	git describe --match "*-match" >expect &&
+	git log -1 --format="%(describe:match=*-match)" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success '%(describe:exclude=...) vs git describe --exclude ...' '
+	test_when_finished "git tag -d tag-exclude" &&
+	git tag -a -m tagged tag-exclude &&
+	git describe --exclude "*-exclude" >expect &&
+	git log -1 --format="%(describe:exclude=*-exclude)" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success '%(describe:tags) vs git describe --tags' '
+	test_when_finished "git tag -d tagname" &&
+	git tag tagname &&
+	git describe --tags >expect &&
+	git log -1 --format="%(describe:tags)" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success '%(describe:abbrev=...) vs git describe --abbrev=...' '
+	test_when_finished "git tag -d tagname" &&
+
+	# Case 1: We have commits between HEAD and the most recent tag
+	#	  reachable from it
+	test_commit --no-tag file &&
+	git describe --abbrev=15 >expect &&
+	git log -1 --format="%(describe:abbrev=15)" >actual &&
+	test_cmp expect actual &&
+
+	# Make sure the hash used is at least 15 digits long
+	sed -e "s/^.*-g\([0-9a-f]*\)$/\1/" <actual >hexpart &&
+	test 16 -le $(wc -c <hexpart) &&
+
+	# Case 2: We have a tag at HEAD, describe directly gives the
+	#	  name of the tag
+	git tag -a -m tagged tagname &&
+	git describe --abbrev=15 >expect &&
+	git log -1 --format="%(describe:abbrev=15)" >actual &&
+	test_cmp expect actual &&
+	test tagname = $(cat actual)
+'
+
+test_expect_success 'log --pretty with space stealing' '
+	printf mm0 >expect &&
+	git log -1 --pretty="format:mm%>>|(1)%x30" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'log --pretty with invalid padding format' '
+	printf "%s%%<(20" "$(git rev-parse HEAD)" >expect &&
+	git log -1 --pretty="format:%H%<(20" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'log --pretty with magical wrapping directives' '
+	commit_id=$(git commit-tree HEAD^{tree} -m "describe me") &&
+	git tag describe-me $commit_id &&
+	printf "\n(tag:\ndescribe-me)%%+w(2)" >expect &&
+	git log -1 --pretty="format:%w(1)%+d%+w(2)" $commit_id >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success SIZE_T_IS_64BIT 'log --pretty with overflowing wrapping directive' '
+	printf "%%w(2147483649,1,1)0" >expect &&
+	git log -1 --pretty="format:%w(2147483649,1,1)%x30" >actual &&
+	test_cmp expect actual &&
+	printf "%%w(1,2147483649,1)0" >expect &&
+	git log -1 --pretty="format:%w(1,2147483649,1)%x30" >actual &&
+	test_cmp expect actual &&
+	printf "%%w(1,1,2147483649)0" >expect &&
+	git log -1 --pretty="format:%w(1,1,2147483649)%x30" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success SIZE_T_IS_64BIT 'log --pretty with overflowing padding directive' '
+	printf "%%<(2147483649)0" >expect &&
+	git log -1 --pretty="format:%<(2147483649)%x30" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'log --pretty with padding and preceding control chars' '
+	printf "\20\20   0" >expect &&
+	git log -1 --pretty="format:%x10%x10%>|(4)%x30" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'log --pretty truncation with control chars' '
+	test_commit "$(printf "\20\20\20\20xxxx")" file contents commit-with-control-chars &&
+	printf "\20\20\20\20x.." >expect &&
+	git log -1 --pretty="format:%<(3,trunc)%s" commit-with-control-chars >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success EXPENSIVE,SIZE_T_IS_64BIT 'log --pretty with huge commit message' '
+	# We only assert that this command does not crash. This needs to be
+	# executed with the address sanitizer to demonstrate failure.
+	git log -1 --pretty="format:%>(2147483646)%x41%41%>(2147483646)%x41" >/dev/null
+'
+
+test_expect_success EXPENSIVE,SIZE_T_IS_64BIT 'set up huge commit' '
+	test-tool genzeros 2147483649 | tr "\000" "1" >expect &&
+	huge_commit=$(git commit-tree -F expect HEAD^{tree})
+'
+
+test_expect_success EXPENSIVE,SIZE_T_IS_64BIT 'log --pretty with huge commit message' '
+	git log -1 --format="%B%<(1)%x30" $huge_commit >actual &&
+	echo 0 >>expect &&
+	test_cmp expect actual
+'
+
+test_expect_success EXPENSIVE,SIZE_T_IS_64BIT 'log --pretty with huge commit message does not cause allocation failure' '
+	test_must_fail git log -1 --format="%<(1)%B" $huge_commit 2>error &&
+	cat >expect <<-EOF &&
+	fatal: number too large to represent as int on this platform: 2147483649
+	EOF
+	test_cmp expect error
+'
+
+# pretty-formats note wide char limitations, and add tests
+test_expect_failure 'wide and decomposed characters column counting' '
+
+# from t/lib-unicode-nfc-nfd.sh hex values converted to octal
+	utf8_nfc=$(printf "\303\251") && # e acute combined.
+	utf8_nfd=$(printf "\145\314\201") && # e with a combining acute (i.e. decomposed)
+	utf8_emoji=$(printf "\360\237\221\250") &&
+
+# replacement character when requesting a wide char fits in a single display colum.
+# "half wide" alternative could be a plain ASCII dot `.`
+	utf8_vert_ell=$(printf "\342\213\256") &&
+
+# use ${xxx} here!
+	nfc10="${utf8_nfc}${utf8_nfc}${utf8_nfc}${utf8_nfc}${utf8_nfc}${utf8_nfc}${utf8_nfc}${utf8_nfc}${utf8_nfc}${utf8_nfc}" &&
+	nfd10="${utf8_nfd}${utf8_nfd}${utf8_nfd}${utf8_nfd}${utf8_nfd}${utf8_nfd}${utf8_nfd}${utf8_nfd}${utf8_nfd}${utf8_nfd}" &&
+	emoji5="${utf8_emoji}${utf8_emoji}${utf8_emoji}${utf8_emoji}${utf8_emoji}" &&
+# emoji5 uses 10 display columns
+
+	test_commit "abcdefghij" &&
+	test_commit --no-tag "${nfc10}" &&
+	test_commit --no-tag "${nfd10}" &&
+	test_commit --no-tag "${emoji5}" &&
+	printf "${utf8_emoji}..${utf8_emoji}${utf8_vert_ell}\n${utf8_nfd}..${utf8_nfd}${utf8_nfd}\n${utf8_nfc}..${utf8_nfc}${utf8_nfc}\na..ij\n" >expected &&
+	git log --format="%<(5,mtrunc)%s" -4 >actual &&
+	test_cmp expected actual
+'
+
 test_done
diff --git a/t/t4206-log-follow-harder-copies.sh b/t/t4206-log-follow-harder-copies.sh
index ad29e65..9167b03 100755
--- a/t/t4206-log-follow-harder-copies.sh
+++ b/t/t4206-log-follow-harder-copies.sh
@@ -6,37 +6,39 @@
 test_description='Test --follow should always find copies hard in git log.
 
 '
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
-. "$TEST_DIRECTORY"/diff-lib.sh
+. "$TEST_DIRECTORY"/lib-diff.sh
 
 echo >path0 'Line 1
 Line 2
 Line 3
 '
 
-test_expect_success \
-    'add a file path0 and commit.' \
-    'git add path0 &&
-     git commit -m "Add path0"'
+test_expect_success 'add a file path0 and commit.' '
+	git add path0 &&
+	git commit -m "Add path0"
+'
 
 echo >path0 'New line 1
 New line 2
 New line 3
 '
-test_expect_success \
-    'Change path0.' \
-    'git add path0 &&
-     git commit -m "Change path0"'
+test_expect_success 'Change path0.' '
+	git add path0 &&
+	git commit -m "Change path0"
+'
 
 cat <path0 >path1
-test_expect_success \
-    'copy path0 to path1.' \
-    'git add path1 &&
-     git commit -m "Copy path1 from path0"'
+test_expect_success 'copy path0 to path1.' '
+	git add path1 &&
+	git commit -m "Copy path1 from path0"
+'
 
-test_expect_success \
-    'find the copy path0 -> path1 harder' \
-    'git log --follow --name-status --pretty="format:%s"  path1 > current'
+test_expect_success 'find the copy path0 -> path1 harder' '
+	git log --follow --name-status --pretty="format:%s"  path1 > current
+'
 
 cat >expected <<\EOF
 Copy path1 from path0
@@ -49,8 +51,8 @@ Add path0
 A	path0
 EOF
 
-test_expect_success \
-    'validate the output.' \
-    'compare_diff_patch current expected'
+test_expect_success 'validate the output.' '
+	compare_diff_patch current expected
+'
 
 test_done
diff --git a/t/t4207-log-decoration-colors.sh b/t/t4207-log-decoration-colors.sh
index 60f040c..73ea9e5 100755
--- a/t/t4207-log-decoration-colors.sh
+++ b/t/t4207-log-decoration-colors.sh
@@ -3,8 +3,12 @@
 # Copyright (c) 2010 Nazri Ramliy
 #
 
-test_description='Test for "git log --decorate" colors'
+test_description='test "git log --decorate" colors'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -13,6 +17,7 @@ test_expect_success setup '
 	git config color.decorate.remoteBranch red &&
 	git config color.decorate.tag "reverse bold yellow" &&
 	git config color.decorate.stash magenta &&
+	git config color.decorate.grafted black &&
 	git config color.decorate.HEAD cyan &&
 
 	c_reset="<RESET>" &&
@@ -23,6 +28,7 @@ test_expect_success setup '
 	c_tag="<BOLD;REVERSE;YELLOW>" &&
 	c_stash="<MAGENTA>" &&
 	c_HEAD="<CYAN>" &&
+	c_grafted="<BLACK>" &&
 
 	test_commit A &&
 	git clone . other &&
@@ -38,25 +44,91 @@ test_expect_success setup '
 	git stash save Changes to A.t
 '
 
-cat >expected <<EOF
-${c_commit}COMMIT_ID${c_reset}${c_commit} (${c_reset}${c_HEAD}HEAD ->\
- ${c_reset}${c_branch}master${c_reset}${c_commit},\
- ${c_reset}${c_tag}tag: v1.0${c_reset}${c_commit},\
- ${c_reset}${c_tag}tag: B${c_reset}${c_commit})${c_reset} B
-${c_commit}COMMIT_ID${c_reset}${c_commit} (${c_reset}${c_tag}tag: A1${c_reset}${c_commit},\
- ${c_reset}${c_remoteBranch}other/master${c_reset}${c_commit})${c_reset} A1
-${c_commit}COMMIT_ID${c_reset}${c_commit} (${c_reset}${c_stash}refs/stash${c_reset}${c_commit})${c_reset}\
- On master: Changes to A.t
-${c_commit}COMMIT_ID${c_reset}${c_commit} (${c_reset}${c_tag}tag: A${c_reset}${c_commit})${c_reset} A
-EOF
+cmp_filtered_decorations () {
+	sed "s/$OID_REGEX/COMMIT_ID/" actual | test_decode_color >filtered &&
+	test_cmp expect filtered
+}
 
 # We want log to show all, but the second parent to refs/stash is irrelevant
 # to this test since it does not contain any decoration, hence --first-parent
-test_expect_success 'Commit Decorations Colored Correctly' '
-	git log --first-parent --abbrev=10 --all --decorate --oneline --color=always |
-	sed "s/[0-9a-f]\{10,10\}/COMMIT_ID/" |
-	test_decode_color >out &&
-	test_cmp expected out
+test_expect_success 'commit decorations colored correctly' '
+	cat >expect <<-EOF &&
+	${c_commit}COMMIT_ID${c_reset}${c_commit} (${c_reset}${c_HEAD}HEAD${c_reset}\
+${c_commit} -> ${c_reset}${c_branch}main${c_reset}${c_commit}, \
+${c_reset}${c_tag}tag: ${c_reset}${c_tag}v1.0${c_reset}${c_commit}, \
+${c_reset}${c_tag}tag: ${c_reset}${c_tag}B${c_reset}${c_commit})${c_reset} B
+${c_commit}COMMIT_ID${c_reset}${c_commit} (${c_reset}\
+${c_tag}tag: ${c_reset}${c_tag}A1${c_reset}${c_commit}, \
+${c_reset}${c_remoteBranch}other/main${c_reset}${c_commit})${c_reset} A1
+	${c_commit}COMMIT_ID${c_reset}${c_commit} (${c_reset}\
+${c_stash}refs/stash${c_reset}${c_commit})${c_reset} On main: Changes to A.t
+	${c_commit}COMMIT_ID${c_reset}${c_commit} (${c_reset}\
+${c_tag}tag: ${c_reset}${c_tag}A${c_reset}${c_commit})${c_reset} A
+	EOF
+
+	git log --first-parent --no-abbrev --decorate --oneline --color=always --all >actual &&
+	cmp_filtered_decorations
+'
+
+remove_replace_refs () {
+	git for-each-ref 'refs/replace*/**' --format='delete %(refname)' >in &&
+	git update-ref --stdin <in &&
+	rm in
+}
+
+test_expect_success 'test coloring with replace-objects' '
+	test_when_finished remove_replace_refs &&
+	test_commit C &&
+	test_commit D &&
+
+	git replace HEAD~1 HEAD~2 &&
+
+	cat >expect <<-EOF &&
+	${c_commit}COMMIT_ID${c_reset}${c_commit} (${c_reset}${c_HEAD}HEAD${c_reset}\
+${c_commit} -> ${c_reset}${c_branch}main${c_reset}${c_commit}, \
+${c_reset}${c_tag}tag: ${c_reset}${c_tag}D${c_reset}${c_commit})${c_reset} D
+	${c_commit}COMMIT_ID${c_reset}${c_commit} (${c_reset}\
+${c_tag}tag: ${c_reset}${c_tag}C${c_reset}${c_commit}, \
+${c_reset}${c_grafted}replaced${c_reset}${c_commit})${c_reset} B
+	${c_commit}COMMIT_ID${c_reset}${c_commit} (${c_reset}\
+${c_tag}tag: ${c_reset}${c_tag}A${c_reset}${c_commit})${c_reset} A
+EOF
+
+	git log --first-parent --no-abbrev --decorate --oneline --color=always HEAD >actual &&
+	cmp_filtered_decorations &&
+	git replace -d HEAD~1 &&
+
+	GIT_REPLACE_REF_BASE=refs/replace2/ git replace HEAD~1 HEAD~2 &&
+	GIT_REPLACE_REF_BASE=refs/replace2/ git log --first-parent \
+		--no-abbrev --decorate --oneline --color=always HEAD >actual &&
+	cmp_filtered_decorations
+'
+
+test_expect_success 'test coloring with grafted commit' '
+	test_when_finished remove_replace_refs &&
+
+	git replace --graft HEAD HEAD~2 &&
+
+	cat >expect <<-EOF &&
+	${c_commit}COMMIT_ID${c_reset}${c_commit} (${c_reset}${c_HEAD}HEAD${c_reset}\
+${c_commit} -> ${c_reset}${c_branch}main${c_reset}${c_commit}, \
+${c_reset}${c_tag}tag: ${c_reset}${c_tag}D${c_reset}${c_commit}, \
+${c_reset}${c_grafted}replaced${c_reset}${c_commit})${c_reset} D
+	${c_commit}COMMIT_ID${c_reset}${c_commit} (${c_reset}\
+${c_tag}tag: ${c_reset}${c_tag}v1.0${c_reset}${c_commit}, \
+${c_reset}${c_tag}tag: ${c_reset}${c_tag}B${c_reset}${c_commit})${c_reset} B
+	${c_commit}COMMIT_ID${c_reset}${c_commit} (${c_reset}\
+${c_tag}tag: ${c_reset}${c_tag}A${c_reset}${c_commit})${c_reset} A
+	EOF
+
+	git log --first-parent --no-abbrev --decorate --oneline --color=always HEAD >actual &&
+	cmp_filtered_decorations &&
+	git replace -d HEAD &&
+
+	GIT_REPLACE_REF_BASE=refs/replace2/ git replace --graft HEAD HEAD~2 &&
+	GIT_REPLACE_REF_BASE=refs/replace2/ git log --first-parent \
+		--no-abbrev --decorate --oneline --color=always HEAD >actual &&
+	cmp_filtered_decorations
 '
 
 test_done
diff --git a/t/t4208-log-magic-pathspec.sh b/t/t4208-log-magic-pathspec.sh
index 6cdbe47..806b280 100755
--- a/t/t4208-log-magic-pathspec.sh
+++ b/t/t4208-log-magic-pathspec.sh
@@ -2,6 +2,9 @@
 
 test_description='magic pathspec tests using git-log'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -18,7 +21,7 @@ test_expect_success '"git log :/" should not be ambiguous' '
 test_expect_success '"git log :/a" should be ambiguous (applied both rev and worktree)' '
 	: >a &&
 	test_must_fail git log :/a 2>error &&
-	test_i18ngrep ambiguous error
+	test_grep ambiguous error
 '
 
 test_expect_success '"git log :/a -- " should not be ambiguous' '
@@ -26,15 +29,10 @@ test_expect_success '"git log :/a -- " should not be ambiguous' '
 '
 
 test_expect_success '"git log :/detached -- " should find a commit only in HEAD' '
-	test_when_finished "git checkout master" &&
+	test_when_finished "git checkout main" &&
 	git checkout --detach &&
-	# Must manually call `test_tick` instead of using `test_commit`,
-	# because the latter additionally creates a tag, which would make
-	# the commit reachable not only via HEAD.
-	test_tick &&
-	git commit --allow-empty -m detached &&
-	test_tick &&
-	git commit --allow-empty -m something-else &&
+	test_commit --no-tag detached &&
+	test_commit --no-tag something-else &&
 	git log :/detached --
 '
 
@@ -67,7 +65,7 @@ test_expect_success '"git log :/in" should not be ambiguous' '
 
 test_expect_success '"git log :" should be ambiguous' '
 	test_must_fail git log : 2>error &&
-	test_i18ngrep ambiguous error
+	test_grep ambiguous error
 '
 
 test_expect_success 'git log -- :' '
@@ -106,7 +104,7 @@ test_expect_success '"git log :(exclude)sub --" must resolve as an object' '
 
 test_expect_success '"git log :(unknown-magic) complains of bogus magic' '
 	test_must_fail git log ":(unknown-magic)" 2>error &&
-	test_i18ngrep pathspec.magic error
+	test_grep pathspec.magic error
 '
 
 test_expect_success 'command line pathspec parsing for "git log"' '
@@ -119,13 +117,14 @@ test_expect_success 'command line pathspec parsing for "git log"' '
 	git checkout HEAD^ &&
 	echo 2 >a &&
 	git commit -a -m "update a to 2" &&
-	test_must_fail git merge master &&
+	test_must_fail git merge main &&
 	git add a &&
 	git log --merge -- a
 '
 
 test_expect_success 'tree_entry_interesting does not match past submodule boundaries' '
 	test_when_finished "rm -rf repo submodule" &&
+	test_config_global protocol.file.allow always &&
 	git init submodule &&
 	test_commit -C submodule initial &&
 	git init repo &&
diff --git a/t/t4209-log-pickaxe.sh b/t/t4209-log-pickaxe.sh
index 5d06f5f..64e1623 100755
--- a/t/t4209-log-pickaxe.sh
+++ b/t/t4209-log-pickaxe.sh
@@ -55,6 +55,43 @@ test_expect_success setup '
 	git rev-parse --verify HEAD >expect_second
 '
 
+test_expect_success 'usage' '
+	test_expect_code 129 git log -S 2>err &&
+	test_grep "switch.*requires a value" err &&
+
+	test_expect_code 129 git log -G 2>err &&
+	test_grep "switch.*requires a value" err &&
+
+	test_expect_code 128 git log -Gregex -Sstring 2>err &&
+	grep "cannot be used together" err &&
+
+	test_expect_code 128 git log -Gregex --find-object=HEAD 2>err &&
+	grep "cannot be used together" err &&
+
+	test_expect_code 128 git log -Sstring --find-object=HEAD 2>err &&
+	grep "cannot be used together" err &&
+
+	test_expect_code 128 git log --pickaxe-all --find-object=HEAD 2>err &&
+	grep "cannot be used together" err
+'
+
+test_expect_success 'usage: --pickaxe-regex' '
+	test_expect_code 128 git log -Gregex --pickaxe-regex 2>err &&
+	grep "cannot be used together" err
+'
+
+test_expect_success 'usage: --no-pickaxe-regex' '
+	cat >expect <<-\EOF &&
+	fatal: unrecognized argument: --no-pickaxe-regex
+	EOF
+
+	test_expect_code 128 git log -Sstring --no-pickaxe-regex 2>actual &&
+	test_cmp expect actual &&
+
+	test_expect_code 128 git log -Gstring --no-pickaxe-regex 2>err &&
+	test_cmp expect actual
+'
+
 test_log	expect_initial	--grep initial
 test_log	expect_nomatch	--grep InItial
 test_log_icase	expect_initial	--grep InItial
@@ -106,38 +143,83 @@ test_expect_success 'log -S --no-textconv (missing textconv tool)' '
 	rm .gitattributes
 '
 
+test_expect_success 'setup log -[GS] plain & regex' '
+	test_create_repo GS-plain &&
+	test_commit -C GS-plain --append A data.txt "a" &&
+	test_commit -C GS-plain --append B data.txt "a a" &&
+	test_commit -C GS-plain --append C data.txt "b" &&
+	test_commit -C GS-plain --append D data.txt "[b]" &&
+	test_commit -C GS-plain E data.txt "" &&
+
+	# We also include E, the deletion commit
+	git -C GS-plain log --grep="[ABE]" >A-to-B-then-E-log &&
+	git -C GS-plain log --grep="[CDE]" >C-to-D-then-E-log &&
+	git -C GS-plain log --grep="[DE]" >D-then-E-log &&
+	git -C GS-plain log >full-log
+'
+
+test_expect_success 'log -G trims diff new/old [-+]' '
+	git -C GS-plain log -G"[+-]a" >log &&
+	test_must_be_empty log &&
+	git -C GS-plain log -G"^a" >log &&
+	test_cmp log A-to-B-then-E-log
+'
+
+test_expect_success 'log -S<pat> is not a regex, but -S<pat> --pickaxe-regex is' '
+	git -C GS-plain log -S"a" >log &&
+	test_cmp log A-to-B-then-E-log &&
+
+	git -C GS-plain log -S"[a]" >log &&
+	test_must_be_empty log &&
+
+	git -C GS-plain log -S"[a]" --pickaxe-regex >log &&
+	test_cmp log A-to-B-then-E-log &&
+
+	git -C GS-plain log -S"[b]" >log &&
+	test_cmp log D-then-E-log &&
+
+	git -C GS-plain log -S"[b]" --pickaxe-regex >log &&
+	test_cmp log C-to-D-then-E-log
+'
+
 test_expect_success 'setup log -[GS] binary & --text' '
-	git checkout --orphan GS-binary-and-text &&
-	git read-tree --empty &&
-	printf "a\na\0a\n" >data.bin &&
-	git add data.bin &&
-	git commit -m "create binary file" data.bin &&
-	printf "a\na\0a\n" >>data.bin &&
-	git commit -m "modify binary file" data.bin &&
-	git rm data.bin &&
-	git commit -m "delete binary file" data.bin &&
-	git log >full-log
+	test_create_repo GS-bin-txt &&
+	test_commit -C GS-bin-txt --printf A data.bin "a\na\0a\n" &&
+	test_commit -C GS-bin-txt --append --printf B data.bin "a\na\0a\n" &&
+	test_commit -C GS-bin-txt C data.bin "" &&
+	git -C GS-bin-txt log >full-log
 '
 
 test_expect_success 'log -G ignores binary files' '
-	git log -Ga >log &&
+	git -C GS-bin-txt log -Ga >log &&
 	test_must_be_empty log
 '
 
 test_expect_success 'log -G looks into binary files with -a' '
-	git log -a -Ga >log &&
+	git -C GS-bin-txt log -a -Ga >log &&
 	test_cmp log full-log
 '
 
 test_expect_success 'log -G looks into binary files with textconv filter' '
-	test_when_finished "rm .gitattributes" &&
-	echo "* diff=bin" >.gitattributes &&
-	git -c diff.bin.textconv=cat log -Ga >log &&
+	test_when_finished "rm GS-bin-txt/.gitattributes" &&
+	(
+		cd GS-bin-txt &&
+		echo "* diff=bin" >.gitattributes &&
+		git -c diff.bin.textconv=cat log -Ga >../log
+	) &&
 	test_cmp log full-log
 '
 
 test_expect_success 'log -S looks into binary files' '
-	git log -Sa >log &&
+	git -C GS-bin-txt log -Sa >log &&
+	test_cmp log full-log
+'
+
+test_expect_success 'log -S --pickaxe-regex looks into binary files' '
+	git -C GS-bin-txt log --pickaxe-regex -Sa >log &&
+	test_cmp log full-log &&
+
+	git -C GS-bin-txt log --pickaxe-regex -S"[a]" >log &&
 	test_cmp log full-log
 '
 
diff --git a/t/t4210-log-i18n.sh b/t/t4210-log-i18n.sh
index d2dfcf1..75216f1 100755
--- a/t/t4210-log-i18n.sh
+++ b/t/t4210-log-i18n.sh
@@ -64,7 +64,7 @@ test_expect_success 'log --grep does not find non-reencoded values (latin1)' '
 '
 
 triggers_undefined_behaviour () {
-	local engine=$1
+	local engine="$1"
 
 	case $engine in
 	fixed)
@@ -85,7 +85,7 @@ triggers_undefined_behaviour () {
 }
 
 mismatched_git_log () {
-	local pattern=$1
+	local pattern="$1"
 
 	LC_ALL=$is_IS_locale git log --encoding=ISO-8859-1 --format=%s \
 		--grep=$pattern
diff --git a/t/t4211-line-log.sh b/t/t4211-line-log.sh
index 2d1d7b5..02d76dc 100755
--- a/t/t4211-line-log.sh
+++ b/t/t4211-line-log.sh
@@ -1,6 +1,9 @@
 #!/bin/sh
 
 test_description='test log -L'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 test_expect_success 'setup (import history)' '
@@ -8,6 +11,28 @@ test_expect_success 'setup (import history)' '
 	git reset --hard
 '
 
+test_expect_success 'basic command line parsing' '
+	# This may fail due to "no such path a.c in commit", or
+	# "-L is incompatible with pathspec", depending on the
+	# order the error is checked.  Either is acceptable.
+	test_must_fail git log -L1,1:a.c -- a.c &&
+
+	# -L requires there is no pathspec
+	test_must_fail git log -L1,1:b.c -- b.c 2>error &&
+	test_grep "cannot be used with pathspec" error &&
+
+	# This would fail because --follow wants a single path, but
+	# we may fail due to incompatibility between -L/--follow in
+	# the future.  Either is acceptable.
+	test_must_fail git log -L1,1:b.c --follow &&
+	test_must_fail git log --follow -L1,1:b.c &&
+
+	# This would fail because -L wants no pathspec, but
+	# we may fail due to incompatibility between -L/--follow in
+	# the future.  Either is acceptable.
+	test_must_fail git log --follow -L1,1:b.c -- b.c
+'
+
 canned_test_1 () {
 	test_expect_$1 "$2" "
 		git log $2 >actual &&
@@ -25,7 +50,7 @@ canned_test_failure () {
 test_bad_opts () {
 	test_expect_success "invalid args: $1" "
 		test_must_fail git log $1 2>errors &&
-		test_i18ngrep '$2' errors
+		test_grep '$2' errors
 	"
 }
 
@@ -112,7 +137,7 @@ test_expect_success 'range_set_union' '
 	test_seq 1000 > c.c &&
 	git add c.c &&
 	git commit -m "modify many lines" &&
-	git log $(for x in $(test_seq 200); do echo -L $((2*x)),+1:c.c; done)
+	git log $(for x in $(test_seq 200); do echo -L $((2*x)),+1:c.c || return 1; done)
 '
 
 test_expect_success '-s shows only line-log commits' '
@@ -290,4 +315,26 @@ test_expect_success 'line-log with --before' '
 	test_cmp expect actual
 '
 
+test_expect_success 'setup tests for zero-width regular expressions' '
+	cat >expect <<-EOF
+	Modify func1() in file.c
+	Add func1() and func2() in file.c
+	EOF
+'
+
+test_expect_success 'zero-width regex $ matches any function name' '
+	git log --format="%s" --no-patch "-L:$:file.c" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'zero-width regex ^ matches any function name' '
+	git log --format="%s" --no-patch "-L:^:file.c" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'zero-width regex .* matches any function name' '
+	git log --format="%s" --no-patch "-L:.*:file.c" >actual &&
+	test_cmp expect actual
+'
+
 test_done
diff --git a/t/t4211/history.export b/t/t4211/history.export
index f9f41e2..006972a 100644
--- a/t/t4211/history.export
+++ b/t/t4211/history.export
@@ -316,7 +316,7 @@ long f(long x)
 	return s;
 }
 
-commit refs/heads/master
+commit refs/heads/main
 mark :19
 author Thomas Rast <trast@student.ethz.ch> 1362045024 +0100
 committer Thomas Rast <trast@student.ethz.ch> 1362045024 +0100
diff --git a/t/t4212-log-corrupt.sh b/t/t4212-log-corrupt.sh
index 03b952c..e6b5912 100755
--- a/t/t4212-log-corrupt.sh
+++ b/t/t4212-log-corrupt.sh
@@ -2,28 +2,30 @@
 
 test_description='git log with invalid commit headers'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
 	test_commit foo &&
 
-	git cat-file commit HEAD |
-	sed "/^author /s/>/>-<>/" >broken_email.commit &&
-	git hash-object -w -t commit broken_email.commit >broken_email.hash &&
+	git cat-file commit HEAD >ok.commit &&
+	sed "s/>/>-<>/" <ok.commit >broken_email.commit &&
+
+	git hash-object --literally -w -t commit broken_email.commit >broken_email.hash &&
 	git update-ref refs/heads/broken_email $(cat broken_email.hash)
 '
 
 test_expect_success 'fsck notices broken commit' '
 	test_must_fail git fsck 2>actual &&
-	test_i18ngrep invalid.author actual
+	test_grep invalid.author actual
 '
 
 test_expect_success 'git log with broken author email' '
 	{
-		echo commit $(cat broken_email.hash)
-		echo "Author: A U Thor <author@example.com>"
-		echo "Date:   Thu Apr 7 15:13:13 2005 -0700"
-		echo
+		echo commit $(cat broken_email.hash) &&
+		echo "Author: A U Thor <author@example.com>" &&
+		echo "Date:   Thu Apr 7 15:13:13 2005 -0700" &&
+		echo &&
 		echo "    foo"
 	} >expect.out &&
 
@@ -42,10 +44,15 @@ test_expect_success 'git log --format with broken author email' '
 	test_must_be_empty actual.err
 '
 
+test_expect_success '--until handles broken email' '
+	git rev-list --until=1980-01-01 broken_email >actual &&
+	test_must_be_empty actual
+'
+
 munge_author_date () {
 	git cat-file commit "$1" >commit.orig &&
 	sed "s/^\(author .*>\) [0-9]*/\1 $2/" <commit.orig >commit.munge &&
-	git hash-object -w -t commit commit.munge
+	git hash-object --literally -w -t commit commit.munge
 }
 
 test_expect_success 'unparsable dates produce sentinel value' '
@@ -85,4 +92,45 @@ test_expect_success 'absurdly far-in-future date' '
 	git log -1 --format=%ad $commit
 '
 
+test_expect_success 'create commits with whitespace committer dates' '
+	# It is important that this subject line is numeric, since we want to
+	# be sure we are not confused by skipping whitespace and accidentally
+	# parsing the subject as a timestamp.
+	#
+	# Do not use munge_author_date here. Besides not hitting the committer
+	# line, it leaves the timezone intact, and we want nothing but
+	# whitespace.
+	#
+	# We will make two munged commits here. The first, ws_commit, will
+	# be purely spaces. The second contains a vertical tab, which is
+	# considered a space by strtoumax(), but not by our isspace().
+	test_commit 1234567890 &&
+	git cat-file commit HEAD >commit.orig &&
+	sed "s/>.*/>    /" <commit.orig >commit.munge &&
+	ws_commit=$(git hash-object --literally -w -t commit commit.munge) &&
+	sed "s/>.*/>   $(printf "\013")/" <commit.orig >commit.munge &&
+	vt_commit=$(git hash-object --literally -w -t commit commit.munge)
+'
+
+test_expect_success '--until treats whitespace date as sentinel' '
+	echo $ws_commit >expect &&
+	git rev-list --until=1980-01-01 $ws_commit >actual &&
+	test_cmp expect actual &&
+
+	echo $vt_commit >expect &&
+	git rev-list --until=1980-01-01 $vt_commit >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'pretty-printer handles whitespace date' '
+	# as with the %ad test above, we will show these as the empty string,
+	# not the 1970 epoch date. This is intentional; see 7d9a281941 (t4212:
+	# test bogus timestamps with git-log, 2014-02-24) for more discussion.
+	echo : >expect &&
+	git log -1 --format="%at:%ct" $ws_commit >actual &&
+	test_cmp expect actual &&
+	git log -1 --format="%at:%ct" $vt_commit >actual &&
+	test_cmp expect actual
+'
+
 test_done
diff --git a/t/t4213-log-tabexpand.sh b/t/t4213-log-tabexpand.sh
index 53a4af3..590fce9 100755
--- a/t/t4213-log-tabexpand.sh
+++ b/t/t4213-log-tabexpand.sh
@@ -2,6 +2,7 @@
 
 test_description='log/show --expand-tabs'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 HT="	"
diff --git a/t/t4214-log-graph-octopus.sh b/t/t4214-log-graph-octopus.sh
index a080325..7905597 100755
--- a/t/t4214-log-graph-octopus.sh
+++ b/t/t4214-log-graph-octopus.sh
@@ -2,6 +2,10 @@
 
 test_description='git log --graph of skewed left octopus merge.'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-log-graph.sh
 
@@ -17,7 +21,7 @@ test_cmp_colored_graph () {
 test_expect_success 'set up merge history' '
 	test_commit initial &&
 	for i in 1 2 3 4 ; do
-		git checkout master -b $i || return $?
+		git checkout main -b $i || return $?
 		# Make tag name different from branch name, to avoid
 		# ambiguity error when calling checkout.
 		test_commit $i $i $i tag$i || return $?
diff --git a/t/t4215-log-skewed-merges.sh b/t/t4215-log-skewed-merges.sh
index 28d0779..b877ac7 100755
--- a/t/t4215-log-skewed-merges.sh
+++ b/t/t4215-log-skewed-merges.sh
@@ -2,6 +2,7 @@
 
 test_description='git log --graph of skewed merges'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-log-graph.sh
 
diff --git a/t/t4216-log-bloom.sh b/t/t4216-log-bloom.sh
index c21cc16..2ba0324 100755
--- a/t/t4216-log-bloom.sh
+++ b/t/t4216-log-bloom.sh
@@ -1,7 +1,11 @@
 #!/bin/sh
 
 test_description='git log for a path with Bloom filters'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-chunk.sh
 
 GIT_TEST_COMMIT_GRAPH=0
 GIT_TEST_COMMIT_GRAPH_CHANGED_PATHS=0
@@ -21,7 +25,7 @@ test_expect_success 'setup test - repo, commits, commit graph, log outputs' '
 	test_commit c10 file_to_be_deleted &&
 	git checkout -b side HEAD~4 &&
 	test_commit side-1 file4 &&
-	git checkout master &&
+	git checkout main &&
 	git merge side &&
 	test_commit c11 file5 &&
 	mv file5 file5_renamed &&
@@ -30,21 +34,29 @@ test_expect_success 'setup test - repo, commits, commit graph, log outputs' '
 	rm file_to_be_deleted &&
 	git add . &&
 	git commit -m "file removed" &&
-	git commit-graph write --reachable --changed-paths
+	git commit --allow-empty -m "empty" &&
+	git commit-graph write --reachable --changed-paths &&
+
+	test_oid_cache <<-EOF
+	oid_version sha1:1
+	oid_version sha256:2
+	EOF
 '
+
 graph_read_expect () {
-	NUM_CHUNKS=5
+	NUM_CHUNKS=6
 	cat >expect <<- EOF
-	header: 43475048 1 1 $NUM_CHUNKS 0
+	header: 43475048 1 $(test_oid oid_version) $NUM_CHUNKS 0
 	num_commits: $1
-	chunks: oid_fanout oid_lookup commit_metadata bloom_indexes bloom_data
+	chunks: oid_fanout oid_lookup commit_metadata generation_data bloom_indexes bloom_data
+	options: bloom(1,10,7) read_generation_data
 	EOF
 	test-tool read-graph >actual &&
 	test_cmp expect actual
 }
 
 test_expect_success 'commit-graph write wrote out the bloom chunks' '
-	graph_read_expect 15
+	graph_read_expect 16
 '
 
 # Turn off any inherited trace2 settings for this test.
@@ -53,14 +65,14 @@ sane_unset GIT_TRACE2_PERF_BRIEF
 sane_unset GIT_TRACE2_CONFIG_PARAMS
 
 setup () {
-	rm "$TRASH_DIRECTORY/trace.perf"
+	rm -f "$TRASH_DIRECTORY/trace.perf" &&
 	git -c core.commitGraph=false log --pretty="format:%s" $1 >log_wo_bloom &&
 	GIT_TRACE2_PERF="$TRASH_DIRECTORY/trace.perf" git -c core.commitGraph=true log --pretty="format:%s" $1 >log_w_bloom
 }
 
 test_bloom_filters_used () {
 	log_args=$1
-	bloom_trace_prefix="statistics:{\"filter_not_present\":0,\"maybe\""
+	bloom_trace_prefix="statistics:{\"filter_not_present\":${2:-0},\"maybe\""
 	setup "$log_args" &&
 	grep -q "$bloom_trace_prefix" "$TRASH_DIRECTORY/trace.perf" &&
 	test_cmp log_wo_bloom log_w_bloom &&
@@ -87,10 +99,12 @@ do
 		      "--topo-order" \
 		      "--date-order" \
 		      "--author-date-order" \
-		      "--ancestry-path side..master"
+		      "--ancestry-path side..main"
 	do
 		test_expect_success "git log option: $option for path: $path" '
-			test_bloom_filters_used "$option -- $path"
+			test_bloom_filters_used "$option -- $path" &&
+			test_config commitgraph.readChangedPaths false &&
+			test_bloom_filters_not_used "$option -- $path"
 		'
 	done
 done
@@ -134,8 +148,11 @@ test_expect_success 'setup - add commit-graph to the chain without Bloom filters
 	test_line_count = 2 .git/objects/info/commit-graphs/commit-graph-chain
 '
 
-test_expect_success 'Do not use Bloom filters if the latest graph does not have Bloom filters.' '
-	test_bloom_filters_not_used "-- A/B"
+test_expect_success 'use Bloom filters even if the latest graph does not have Bloom filters' '
+	# Ensure that the number of empty filters is equal to the number of
+	# filters in the latest graph layer to prove that they are loaded (and
+	# ignored).
+	test_bloom_filters_used "-- A/B" 3
 '
 
 test_expect_success 'setup - add commit-graph to the chain with Bloom filters' '
@@ -146,7 +163,7 @@ test_expect_success 'setup - add commit-graph to the chain with Bloom filters' '
 
 test_bloom_filters_used_when_some_filters_are_missing () {
 	log_args=$1
-	bloom_trace_prefix="statistics:{\"filter_not_present\":3,\"maybe\":6,\"definitely_not\":8"
+	bloom_trace_prefix="statistics:{\"filter_not_present\":3,\"maybe\":6,\"definitely_not\":9"
 	setup "$log_args" &&
 	grep -q "$bloom_trace_prefix" "$TRASH_DIRECTORY/trace.perf" &&
 	test_cmp log_wo_bloom log_w_bloom
@@ -160,35 +177,281 @@ test_expect_success 'persist filter settings' '
 	test_when_finished rm -rf .git/objects/info/commit-graph* &&
 	rm -rf .git/objects/info/commit-graph* &&
 	GIT_TRACE2_EVENT="$(pwd)/trace2.txt" \
-		GIT_TRACE2_EVENT_NESTING=5 \
 		GIT_TEST_BLOOM_SETTINGS_NUM_HASHES=9 \
 		GIT_TEST_BLOOM_SETTINGS_BITS_PER_ENTRY=15 \
 		git commit-graph write --reachable --changed-paths &&
-	grep "{\"hash_version\":1,\"num_hashes\":9,\"bits_per_entry\":15}" trace2.txt &&
+	grep "{\"hash_version\":1,\"num_hashes\":9,\"bits_per_entry\":15,\"max_changed_paths\":512" trace2.txt &&
 	GIT_TRACE2_EVENT="$(pwd)/trace2-auto.txt" \
-		GIT_TRACE2_EVENT_NESTING=5 \
 		git commit-graph write --reachable --changed-paths &&
-	grep "{\"hash_version\":1,\"num_hashes\":9,\"bits_per_entry\":15}" trace2-auto.txt
+	grep "{\"hash_version\":1,\"num_hashes\":9,\"bits_per_entry\":15,\"max_changed_paths\":512" trace2-auto.txt
 '
 
+test_max_changed_paths () {
+	grep "\"max_changed_paths\":$1" $2
+}
+
+test_filter_not_computed () {
+	grep "\"key\":\"filter-not-computed\",\"value\":\"$1\"" $2
+}
+
+test_filter_computed () {
+	grep "\"key\":\"filter-computed\",\"value\":\"$1\"" $2
+}
+
+test_filter_trunc_empty () {
+	grep "\"key\":\"filter-trunc-empty\",\"value\":\"$1\"" $2
+}
+
+test_filter_trunc_large () {
+	grep "\"key\":\"filter-trunc-large\",\"value\":\"$1\"" $2
+}
+
 test_expect_success 'correctly report changes over limit' '
-	git init 513changes &&
+	git init limits &&
 	(
-		cd 513changes &&
-		for i in $(test_seq 1 513)
+		cd limits &&
+		mkdir d &&
+		mkdir d/e &&
+
+		for i in $(test_seq 1 2)
 		do
-			echo $i >file$i.txt || return 1
+			printf $i >d/file$i.txt &&
+			printf $i >d/e/file$i.txt || return 1
 		done &&
-		git add . &&
+
+		mkdir mode &&
+		printf bash >mode/script.sh &&
+
+		mkdir foo &&
+		touch foo/bar &&
+		touch foo.txt &&
+
+		git add d foo foo.txt mode &&
 		git commit -m "files" &&
-		git commit-graph write --reachable --changed-paths &&
-		for i in $(test_seq 1 513)
+
+		# Commit has 7 file and 4 directory adds
+		GIT_TEST_BLOOM_SETTINGS_MAX_CHANGED_PATHS=10 \
+			GIT_TRACE2_EVENT="$(pwd)/trace" \
+			git commit-graph write --reachable --changed-paths &&
+		test_max_changed_paths 10 trace &&
+		test_filter_computed 1 trace &&
+		test_filter_trunc_large 1 trace &&
+
+		for path in $(git ls-tree -r --name-only HEAD)
+		do
+			git -c commitGraph.readChangedPaths=false log \
+				-- $path >expect &&
+			git log -- $path >actual &&
+			test_cmp expect actual || return 1
+		done &&
+
+		# Make a variety of path changes
+		printf new1 >d/e/file1.txt &&
+		printf new2 >d/file2.txt &&
+		rm d/e/file2.txt &&
+		rm -r foo &&
+		printf text >foo &&
+		mkdir f &&
+		printf new1 >f/file1.txt &&
+
+		# including a mode-only change (counts as modified)
+		git update-index --chmod=+x mode/script.sh &&
+
+		git add foo d f &&
+		git commit -m "complicated" &&
+
+		# start from scratch and rebuild
+		rm -f .git/objects/info/commit-graph &&
+		GIT_TEST_BLOOM_SETTINGS_MAX_CHANGED_PATHS=10 \
+			GIT_TRACE2_EVENT="$(pwd)/trace-edit" \
+			git commit-graph write --reachable --changed-paths &&
+		test_max_changed_paths 10 trace-edit &&
+		test_filter_computed 2 trace-edit &&
+		test_filter_trunc_large 2 trace-edit &&
+
+		for path in $(git ls-tree -r --name-only HEAD)
 		do
-			git -c core.commitGraph=false log -- file$i.txt >expect &&
-			git log -- file$i.txt >actual &&
+			git -c commitGraph.readChangedPaths=false log \
+				-- $path >expect &&
+			git log -- $path >actual &&
+			test_cmp expect actual || return 1
+		done &&
+
+		# start from scratch and rebuild
+		rm -f .git/objects/info/commit-graph &&
+		GIT_TEST_BLOOM_SETTINGS_MAX_CHANGED_PATHS=11 \
+			GIT_TRACE2_EVENT="$(pwd)/trace-update" \
+			git commit-graph write --reachable --changed-paths &&
+		test_max_changed_paths 11 trace-update &&
+		test_filter_computed 2 trace-update &&
+		test_filter_trunc_large 0 trace-update &&
+
+		for path in $(git ls-tree -r --name-only HEAD)
+		do
+			git -c commitGraph.readChangedPaths=false log \
+				-- $path >expect &&
+			git log -- $path >actual &&
 			test_cmp expect actual || return 1
 		done
 	)
 '
 
+test_expect_success 'correctly report commits with no changed paths' '
+	git init empty &&
+	test_when_finished "rm -fr empty" &&
+	(
+		cd empty &&
+
+		git commit --allow-empty -m "initial commit" &&
+
+		GIT_TRACE2_EVENT="$(pwd)/trace.event" \
+			git commit-graph write --reachable --changed-paths &&
+		test_filter_computed 1 trace.event &&
+		test_filter_not_computed 0 trace.event &&
+		test_filter_trunc_empty 1 trace.event &&
+		test_filter_trunc_large 0 trace.event
+	)
+'
+
+test_expect_success 'Bloom generation is limited by --max-new-filters' '
+	(
+		cd limits &&
+		test_commit c2 filter &&
+		test_commit c3 filter &&
+		test_commit c4 no-filter &&
+
+		rm -f trace.event &&
+		GIT_TRACE2_EVENT="$(pwd)/trace.event" \
+			git commit-graph write --reachable --split=replace \
+				--changed-paths --max-new-filters=2 &&
+
+		test_filter_computed 2 trace.event &&
+		test_filter_not_computed 3 trace.event &&
+		test_filter_trunc_empty 0 trace.event &&
+		test_filter_trunc_large 0 trace.event
+	)
+'
+
+test_expect_success 'Bloom generation backfills previously-skipped filters' '
+	# Check specifying commitGraph.maxNewFilters over "git config" works.
+	test_config -C limits commitGraph.maxNewFilters 1 &&
+	(
+		cd limits &&
+
+		rm -f trace.event &&
+		GIT_TRACE2_EVENT="$(pwd)/trace.event" \
+			git commit-graph write --reachable --changed-paths \
+				--split=replace &&
+		test_filter_computed 1 trace.event &&
+		test_filter_not_computed 4 trace.event &&
+		test_filter_trunc_empty 0 trace.event &&
+		test_filter_trunc_large 0 trace.event
+	)
+'
+
+test_expect_success '--max-new-filters overrides configuration' '
+	git init override &&
+	test_when_finished "rm -fr override" &&
+	test_config -C override commitGraph.maxNewFilters 2 &&
+	(
+		cd override &&
+		test_commit one &&
+		test_commit two &&
+
+		rm -f trace.event &&
+		GIT_TRACE2_EVENT="$(pwd)/trace.event" \
+			git commit-graph write --reachable --changed-paths \
+				--max-new-filters=1 &&
+		test_filter_computed 1 trace.event &&
+		test_filter_not_computed 1 trace.event &&
+		test_filter_trunc_empty 0 trace.event &&
+		test_filter_trunc_large 0 trace.event
+	)
+'
+
+test_expect_success 'Bloom generation backfills empty commits' '
+	git init empty &&
+	test_when_finished "rm -fr empty" &&
+	(
+		cd empty &&
+		for i in $(test_seq 1 6)
+		do
+			git commit --allow-empty -m "$i" || return 1
+		done &&
+
+		# Generate Bloom filters for empty commits 1-6, two at a time.
+		for i in $(test_seq 1 3)
+		do
+			rm -f trace.event &&
+			GIT_TRACE2_EVENT="$(pwd)/trace.event" \
+				git commit-graph write --reachable \
+					--changed-paths --max-new-filters=2 &&
+			test_filter_computed 2 trace.event &&
+			test_filter_not_computed 4 trace.event &&
+			test_filter_trunc_empty 2 trace.event &&
+			test_filter_trunc_large 0 trace.event || return 1
+		done &&
+
+		# Finally, make sure that once all commits have filters, that
+		# none are subsequently recomputed.
+		rm -f trace.event &&
+		GIT_TRACE2_EVENT="$(pwd)/trace.event" \
+			git commit-graph write --reachable \
+				--changed-paths --max-new-filters=2 &&
+		test_filter_computed 0 trace.event &&
+		test_filter_not_computed 6 trace.event &&
+		test_filter_trunc_empty 0 trace.event &&
+		test_filter_trunc_large 0 trace.event
+	)
+'
+
+corrupt_graph () {
+	graph=.git/objects/info/commit-graph &&
+	test_when_finished "rm -rf $graph" &&
+	git commit-graph write --reachable --changed-paths &&
+	corrupt_chunk_file $graph "$@"
+}
+
+check_corrupt_graph () {
+	corrupt_graph "$@" &&
+	git -c core.commitGraph=false log -- A/B/file2 >expect.out &&
+	git -c core.commitGraph=true log -- A/B/file2 >out 2>err &&
+	test_cmp expect.out out
+}
+
+test_expect_success 'Bloom reader notices too-small data chunk' '
+	check_corrupt_graph BDAT clear 00000000 &&
+	echo "warning: ignoring too-small changed-path chunk" \
+		"(4 < 12) in commit-graph file" >expect.err &&
+	test_cmp expect.err err
+'
+
+test_expect_success 'Bloom reader notices out-of-bounds filter offsets' '
+	check_corrupt_graph BIDX 12 FFFFFFFF &&
+	# use grep to avoid depending on exact chunk size
+	grep "warning: ignoring out-of-range offset (4294967295) for changed-path filter at pos 3 of .git/objects/info/commit-graph" err
+'
+
+test_expect_success 'Bloom reader notices too-small index chunk' '
+	# replace the index with a single entry, making most
+	# lookups out-of-bounds
+	check_corrupt_graph BIDX clear 00000000 &&
+	echo "warning: commit-graph changed-path index chunk" \
+		"is too small" >expect.err &&
+	test_cmp expect.err err
+'
+
+test_expect_success 'Bloom reader notices out-of-order index offsets' '
+	# we do not know any real offsets, but we can pick
+	# something plausible; we should not get to the point of
+	# actually reading from the bogus offsets anyway.
+	corrupt_graph BIDX 4 0000000c00000005 &&
+	echo "warning: ignoring decreasing changed-path index offsets" \
+		"(12 > 5) for positions 1 and 2 of .git/objects/info/commit-graph" >expect.err &&
+	git -c core.commitGraph=false log -- A/B/file2 >expect.out &&
+	git -c core.commitGraph=true log -- A/B/file2 >out 2>err &&
+	test_cmp expect.out out &&
+	test_cmp expect.err err
+'
+
 test_done
diff --git a/t/t4217-log-limit.sh b/t/t4217-log-limit.sh
new file mode 100755
index 0000000..613f071
--- /dev/null
+++ b/t/t4217-log-limit.sh
@@ -0,0 +1,42 @@
+#!/bin/sh
+
+test_description='git log with filter options limiting the output'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+test_expect_success 'setup test' '
+	git init &&
+	echo a >file &&
+	git add file &&
+	GIT_COMMITTER_DATE="2021-02-01 00:00" git commit -m init &&
+	echo a >>file &&
+	git add file &&
+	GIT_COMMITTER_DATE="2022-02-01 00:00" git commit -m first &&
+	echo a >>file &&
+	git add file &&
+	GIT_COMMITTER_DATE="2021-03-01 00:00" git commit -m second &&
+	echo a >>file &&
+	git add file &&
+	GIT_COMMITTER_DATE="2022-03-01 00:00" git commit -m third
+'
+
+test_expect_success 'git log --since-as-filter=...' '
+	git log --since-as-filter="2022-01-01" --format=%s >actual &&
+	cat >expect <<-\EOF &&
+	third
+	first
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'git log --children --since-as-filter=...' '
+	git log --children --since-as-filter="2022-01-01" --format=%s >actual &&
+	cat >expect <<-\EOF &&
+	third
+	first
+	EOF
+	test_cmp expect actual
+'
+
+test_done
diff --git a/t/t4253-am-keep-cr-dos.sh b/t/t4253-am-keep-cr-dos.sh
index 6e1b73e..0ee69d2 100755
--- a/t/t4253-am-keep-cr-dos.sh
+++ b/t/t4253-am-keep-cr-dos.sh
@@ -6,6 +6,9 @@
 test_description='git-am mbox with dos line ending.
 
 '
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 # Three patches which will be added as files with dos line ending.
@@ -43,7 +46,7 @@ test_expect_success 'setup repository with dos files' '
 
 test_expect_success 'am with dos files without --keep-cr' '
 	git checkout -b dosfiles initial &&
-	git format-patch -k initial..master &&
+	git format-patch -k initial..main &&
 	test_must_fail git am -k -3 000*.patch &&
 	git am --abort &&
 	rm -rf .git/rebase-apply 000*.patch
@@ -51,23 +54,23 @@ test_expect_success 'am with dos files without --keep-cr' '
 
 test_expect_success 'am with dos files with --keep-cr' '
 	git checkout -b dosfiles-keep-cr initial &&
-	git format-patch -k --stdout initial..master >output &&
+	git format-patch -k --stdout initial..main >output &&
 	git am --keep-cr -k -3 output &&
-	git diff --exit-code master
+	git diff --exit-code main
 '
 
 test_expect_success 'am with dos files config am.keepcr' '
 	git config am.keepcr 1 &&
 	git checkout -b dosfiles-conf-keepcr initial &&
-	git format-patch -k --stdout initial..master >output &&
+	git format-patch -k --stdout initial..main >output &&
 	git am -k -3 output &&
-	git diff --exit-code master
+	git diff --exit-code main
 '
 
 test_expect_success 'am with dos files config am.keepcr overridden by --no-keep-cr' '
 	git config am.keepcr 1 &&
 	git checkout -b dosfiles-conf-keepcr-override initial &&
-	git format-patch -k initial..master &&
+	git format-patch -k initial..main &&
 	test_must_fail git am -k -3 --no-keep-cr 000*.patch &&
 	git am --abort &&
 	rm -rf .git/rebase-apply 000*.patch
@@ -75,14 +78,14 @@ test_expect_success 'am with dos files config am.keepcr overridden by --no-keep-
 
 test_expect_success 'am with dos files with --keep-cr continue' '
 	git checkout -b dosfiles-keep-cr-continue initial &&
-	git format-patch -k initial..master &&
+	git format-patch -k initial..main &&
 	append_cr <file1a >file &&
 	git commit -m "different patch" file &&
 	test_must_fail git am --keep-cr -k -3 000*.patch &&
 	append_cr <file2 >file &&
 	git add file &&
 	git am -3 --resolved &&
-	git diff --exit-code master
+	git diff --exit-code main
 '
 
 test_expect_success 'am with unix files config am.keepcr overridden by --no-keep-cr' '
@@ -90,9 +93,9 @@ test_expect_success 'am with unix files config am.keepcr overridden by --no-keep
 	git checkout -b unixfiles-conf-keepcr-override initial &&
 	cp -f file1 file &&
 	git commit -m "line ending to unix" file &&
-	git format-patch -k initial..master &&
+	git format-patch -k initial..main &&
 	git am -k -3 --no-keep-cr 000*.patch &&
-	git diff --exit-code -w master
+	git diff --exit-code -w main
 '
 
 test_done
diff --git a/t/t4254-am-corrupt.sh b/t/t4254-am-corrupt.sh
index daf01c3..661feb6 100755
--- a/t/t4254-am-corrupt.sh
+++ b/t/t4254-am-corrupt.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='git am with corrupt input'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 make_mbox_with_nul () {
@@ -57,10 +59,10 @@ test_expect_success setup '
 # Also, it had the unwanted side-effect of deleting f.
 test_expect_success 'try to apply corrupted patch' '
 	test_when_finished "git am --abort" &&
-	test_must_fail git -c advice.amWorkDir=false am bad-patch.diff 2>actual &&
+	test_must_fail git -c advice.amWorkDir=false -c advice.mergeConflict=false am bad-patch.diff 2>actual &&
 	echo "error: git diff header lacks filename information (line 4)" >expected &&
 	test_path_is_file f &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 test_expect_success "NUL in commit message's body" '
diff --git a/t/t4256-am-format-flowed.sh b/t/t4256-am-format-flowed.sh
index 2369c4e..92d8c8b 100755
--- a/t/t4256-am-format-flowed.sh
+++ b/t/t4256-am-format-flowed.sh
@@ -2,6 +2,7 @@
 
 test_description='test format=flowed support of git am'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -12,7 +13,7 @@ test_expect_success 'setup' '
 
 test_expect_success 'am with format=flowed' '
 	git am <"$TEST_DIRECTORY/t4256/1/patch" 2>stderr &&
-	test_i18ngrep "warning: Patch sent with format=flowed" stderr &&
+	test_grep "warning: Patch sent with format=flowed" stderr &&
 	test_cmp "$TEST_DIRECTORY/t4256/1/mailinfo.c" mailinfo.c
 '
 
diff --git a/t/t4257-am-interactive.sh b/t/t4257-am-interactive.sh
index 5344bd2..f26d7fd 100755
--- a/t/t4257-am-interactive.sh
+++ b/t/t4257-am-interactive.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='am --interactive tests'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'set up patches to apply' '
@@ -10,7 +12,7 @@ test_expect_success 'set up patches to apply' '
 	git format-patch --stdout -2 >mbox &&
 
 	git reset --hard unrelated &&
-	test_commit conflict-master file master base
+	test_commit conflict-main file main base
 '
 
 # Sanity check our setup.
diff --git a/t/t4258-am-quoted-cr.sh b/t/t4258-am-quoted-cr.sh
new file mode 100755
index 0000000..201915b
--- /dev/null
+++ b/t/t4258-am-quoted-cr.sh
@@ -0,0 +1,37 @@
+#!/bin/sh
+
+test_description='test am --quoted-cr=<action>'
+
+. ./test-lib.sh
+
+DATA="$TEST_DIRECTORY/t4258"
+
+test_expect_success 'setup' '
+	test_write_lines one two three >text &&
+	test_commit one text &&
+	test_write_lines one owt three >text &&
+	test_commit two text
+'
+
+test_expect_success 'am warn if quoted-cr is found' '
+	git reset --hard one &&
+	test_must_fail git am "$DATA/mbox" 2>err &&
+	grep "quoted CRLF detected" err
+'
+
+test_expect_success 'am --quoted-cr=strip' '
+	test_might_fail git am --abort &&
+	git reset --hard one &&
+	git am --quoted-cr=strip "$DATA/mbox" &&
+	git diff --exit-code HEAD two
+'
+
+test_expect_success 'am with config mailinfo.quotedCr=strip' '
+	test_might_fail git am --abort &&
+	git reset --hard one &&
+	test_config mailinfo.quotedCr strip &&
+	git am "$DATA/mbox" &&
+	git diff --exit-code HEAD two
+'
+
+test_done
diff --git a/t/t4258/mbox b/t/t4258/mbox
new file mode 100644
index 0000000..1ae528b
--- /dev/null
+++ b/t/t4258/mbox
@@ -0,0 +1,12 @@
+From: A U Thor <mail@example.com>
+To: list@example.org
+Subject: [PATCH v2] sample
+Date: Mon,  3 Aug 2020 22:40:55 +0700
+Message-ID: <msg-id@example.com>
+Content-Type: text/plain; charset="utf-8"
+Content-Transfer-Encoding: base64
+
+VGhpcyBpcyBjb21taXQgbWVzc2FnZS4NCi0tLQ0KIHRleHQgfCAyICstDQogMSBmaWxlIGNoYW5n
+ZWQsIDEgaW5zZXJ0aW9uKCspLCAxIGRlbGV0aW9uKC0pDQoNCmRpZmYgLS1naXQgYS90ZXh0IGIv
+dGV4dA0KaW5kZXggNTYyNmFiZi4uZjcxOWVmZCAxMDA2NDQNCi0tLSBhL3RleHQNCisrKyBiL3Rl
+eHQNCkBAIC0xICsxIEBADQotb25lDQordHdvDQotLSANCjIuMzEuMQoK
diff --git a/t/t4300-merge-tree.sh b/t/t4300-merge-tree.sh
index e59601e..9c19726 100755
--- a/t/t4300-merge-tree.sh
+++ b/t/t4300-merge-tree.sh
@@ -4,6 +4,8 @@
 #
 
 test_description='git merge-tree'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -84,6 +86,33 @@ EXPECTED
 	test_cmp expected actual
 '
 
+test_expect_success '3-way merge with --attr-source' '
+	test_when_finished rm -rf 3-way &&
+	git init 3-way &&
+	(
+		cd 3-way &&
+		test_commit initial file1 foo &&
+		base=$(git rev-parse HEAD) &&
+		git checkout -b brancha &&
+		echo bar >>file1 &&
+		git commit -am "adding bar" &&
+		source=$(git rev-parse HEAD) &&
+		git checkout @{-1} &&
+		git checkout -b branchb &&
+		echo baz >>file1 &&
+		git commit -am "adding baz" &&
+		merge=$(git rev-parse HEAD) &&
+		git checkout -b gitattributes &&
+		test_commit "gitattributes" .gitattributes "file1 merge=union" &&
+		git checkout @{-1} &&
+		tree=$(git --attr-source=gitattributes merge-tree --write-tree \
+		--merge-base "$base" --end-of-options "$source" "$merge") &&
+		test_write_lines foo bar baz >expect &&
+		git cat-file -p "$tree:file1" >actual &&
+		test_cmp expect actual
+	)
+'
+
 test_expect_success 'file change A, B (same)' '
 	git reset --hard initial &&
 	test_commit "change-a-b-same-A" "initial-file" "AAA" &&
@@ -332,4 +361,22 @@ test_expect_success 'turn tree to file' '
 	test_cmp expect actual
 '
 
+test_expect_success 'merge-tree respects core.useReplaceRefs=false' '
+	test_commit merge-to &&
+	test_commit valid base &&
+	git reset --hard HEAD^ &&
+	test_commit malicious base &&
+
+	test_when_finished "git replace -d $(git rev-parse valid^0)" &&
+	git replace valid^0 malicious^0 &&
+
+	tree=$(git -c core.useReplaceRefs=true merge-tree --write-tree merge-to valid) &&
+	merged=$(git cat-file -p $tree:base) &&
+	test malicious = $merged &&
+
+	tree=$(git -c core.useReplaceRefs=false merge-tree --write-tree merge-to valid) &&
+	merged=$(git cat-file -p $tree:base) &&
+	test valid = $merged
+'
+
 test_done
diff --git a/t/t4301-merge-tree-write-tree.sh b/t/t4301-merge-tree-write-tree.sh
new file mode 100755
index 0000000..eea1990
--- /dev/null
+++ b/t/t4301-merge-tree-write-tree.sh
@@ -0,0 +1,993 @@
+#!/bin/sh
+
+test_description='git merge-tree --write-tree'
+
+. ./test-lib.sh
+
+# This test is ort-specific
+if test "$GIT_TEST_MERGE_ALGORITHM" != "ort"
+then
+	skip_all="GIT_TEST_MERGE_ALGORITHM != ort"
+	test_done
+fi
+
+test_expect_success setup '
+	test_write_lines 1 2 3 4 5 >numbers &&
+	echo hello >greeting &&
+	echo foo >whatever &&
+	git add numbers greeting whatever &&
+	test_tick &&
+	git commit -m initial &&
+
+	git branch side1 &&
+	git branch side2 &&
+	git branch side3 &&
+	git branch side4 &&
+
+	git checkout side1 &&
+	test_write_lines 1 2 3 4 5 6 >numbers &&
+	echo hi >greeting &&
+	echo bar >whatever &&
+	git add numbers greeting whatever &&
+	test_tick &&
+	git commit -m modify-stuff &&
+
+	git checkout side2 &&
+	test_write_lines 0 1 2 3 4 5 >numbers &&
+	echo yo >greeting &&
+	git rm whatever &&
+	mkdir whatever &&
+	>whatever/empty &&
+	git add numbers greeting whatever/empty &&
+	test_tick &&
+	git commit -m other-modifications &&
+
+	git checkout side3 &&
+	git mv numbers sequence &&
+	test_tick &&
+	git commit -m rename-numbers &&
+
+	git checkout side4 &&
+	test_write_lines 0 1 2 3 4 5 >numbers &&
+	echo yo >greeting &&
+	git add numbers greeting &&
+	test_tick &&
+	git commit -m other-content-modifications &&
+
+	git switch --orphan unrelated &&
+	>something-else &&
+	git add something-else &&
+	test_tick &&
+	git commit -m first-commit
+'
+
+test_expect_success 'Clean merge' '
+	TREE_OID=$(git merge-tree --write-tree side1 side3) &&
+	q_to_tab <<-EOF >expect &&
+	100644 blob $(git rev-parse side1:greeting)Qgreeting
+	100644 blob $(git rev-parse side1:numbers)Qsequence
+	100644 blob $(git rev-parse side1:whatever)Qwhatever
+	EOF
+
+	git ls-tree $TREE_OID >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'Content merge and a few conflicts' '
+	git checkout side1^0 &&
+	test_must_fail git merge side2 &&
+	expected_tree=$(git rev-parse AUTO_MERGE) &&
+
+	# We will redo the merge, while we are still in a conflicted state!
+	git ls-files -u >conflicted-file-info &&
+	test_when_finished "git reset --hard" &&
+
+	test_expect_code 1 git merge-tree --write-tree side1 side2 >RESULT &&
+	actual_tree=$(head -n 1 RESULT) &&
+
+	# Due to differences of e.g. "HEAD" vs "side1", the results will not
+	# exactly match.  Dig into individual files.
+
+	# Numbers should have three-way merged cleanly
+	test_write_lines 0 1 2 3 4 5 6 >expect &&
+	git show ${actual_tree}:numbers >actual &&
+	test_cmp expect actual &&
+
+	# whatever and whatever~<branch> should have same HASHES
+	git rev-parse ${expected_tree}:whatever ${expected_tree}:whatever~HEAD >expect &&
+	git rev-parse ${actual_tree}:whatever ${actual_tree}:whatever~side1 >actual &&
+	test_cmp expect actual &&
+
+	# greeting should have a merge conflict
+	git show ${expected_tree}:greeting >tmp &&
+	sed -e s/HEAD/side1/ tmp >expect &&
+	git show ${actual_tree}:greeting >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'Auto resolve conflicts by "ours" strategy option' '
+	git checkout side1^0 &&
+
+	# make sure merge conflict exists
+	test_must_fail git merge side4 &&
+	git merge --abort &&
+
+	git merge -X ours side4 &&
+	git rev-parse HEAD^{tree} >expected &&
+
+	git merge-tree -X ours side1 side4 >actual &&
+
+	test_cmp expected actual
+'
+
+test_expect_success 'Barf on misspelled option, with exit code other than 0 or 1' '
+	# Mis-spell with single "s" instead of double "s"
+	test_expect_code 129 git merge-tree --write-tree --mesages FOOBAR side1 side2 2>expect &&
+
+	grep "error: unknown option.*mesages" expect
+'
+
+test_expect_success 'Barf on too many arguments' '
+	test_expect_code 129 git merge-tree --write-tree side1 side2 invalid 2>expect &&
+
+	grep "^usage: git merge-tree" expect
+'
+
+anonymize_hash() {
+	sed -e "s/[0-9a-f]\{40,\}/HASH/g" "$@"
+}
+
+test_expect_success 'test conflict notices and such' '
+	test_expect_code 1 git merge-tree --write-tree --name-only side1 side2 >out &&
+	anonymize_hash out >actual &&
+
+	# Expected results:
+	#   "greeting" should merge with conflicts
+	#   "numbers" should merge cleanly
+	#   "whatever" has *both* a modify/delete and a file/directory conflict
+	cat <<-EOF >expect &&
+	HASH
+	greeting
+	whatever~side1
+
+	Auto-merging greeting
+	CONFLICT (content): Merge conflict in greeting
+	Auto-merging numbers
+	CONFLICT (file/directory): directory in the way of whatever from side1; moving it to whatever~side1 instead.
+	CONFLICT (modify/delete): whatever~side1 deleted in side2 and modified in side1.  Version side1 of whatever~side1 left in tree.
+	EOF
+
+	test_cmp expect actual
+'
+
+# directory rename + content conflict
+#   Commit O: foo, olddir/{a,b,c}
+#   Commit A: modify foo, newdir/{a,b,c}
+#   Commit B: modify foo differently & rename foo -> olddir/bar
+#   Expected: CONFLICT(content) for newdir/bar (not olddir/bar or foo)
+
+test_expect_success 'directory rename + content conflict' '
+	# Setup
+	git init dir-rename-and-content &&
+	(
+		cd dir-rename-and-content &&
+		test_write_lines 1 2 3 4 5 >foo &&
+		mkdir olddir &&
+		for i in a b c; do echo $i >olddir/$i || exit 1; done &&
+		git add foo olddir &&
+		git commit -m "original" &&
+
+		git branch O &&
+		git branch A &&
+		git branch B &&
+
+		git checkout A &&
+		test_write_lines 1 2 3 4 5 6 >foo &&
+		git add foo &&
+		git mv olddir newdir &&
+		git commit -m "Modify foo, rename olddir to newdir" &&
+
+		git checkout B &&
+		test_write_lines 1 2 3 4 5 six >foo &&
+		git add foo &&
+		git mv foo olddir/bar &&
+		git commit -m "Modify foo & rename foo -> olddir/bar"
+	) &&
+	# Testing
+	(
+		cd dir-rename-and-content &&
+
+		test_expect_code 1 \
+			git merge-tree -z A^0 B^0 >out &&
+		echo >>out &&
+		anonymize_hash out >actual &&
+		q_to_tab <<-\EOF | lf_to_nul >expect &&
+		HASH
+		100644 HASH 1Qnewdir/bar
+		100644 HASH 2Qnewdir/bar
+		100644 HASH 3Qnewdir/bar
+		EOF
+
+		q_to_nul <<-EOF >>expect &&
+		Q2Qnewdir/barQolddir/barQCONFLICT (directory rename suggested)QCONFLICT (file location): foo renamed to olddir/bar in B^0, inside a directory that was renamed in A^0, suggesting it should perhaps be moved to newdir/bar.
+		Q1Qnewdir/barQAuto-mergingQAuto-merging newdir/bar
+		Q1Qnewdir/barQCONFLICT (contents)QCONFLICT (content): Merge conflict in newdir/bar
+		Q
+		EOF
+		test_cmp expect actual
+	)
+'
+
+# rename/delete + modify/delete handling
+#   Commit O: foo
+#   Commit A: modify foo + rename to bar
+#   Commit B: delete foo
+#   Expected: CONFLICT(rename/delete) + CONFLICT(modify/delete)
+
+test_expect_success 'rename/delete handling' '
+	# Setup
+	git init rename-delete &&
+	(
+		cd rename-delete &&
+		test_write_lines 1 2 3 4 5 >foo &&
+		git add foo &&
+		git commit -m "original" &&
+
+		git branch O &&
+		git branch A &&
+		git branch B &&
+
+		git checkout A &&
+		test_write_lines 1 2 3 4 5 6 >foo &&
+		git add foo &&
+		git mv foo bar &&
+		git commit -m "Modify foo, rename to bar" &&
+
+		git checkout B &&
+		git rm foo &&
+		git commit -m "remove foo"
+	) &&
+	# Testing
+	(
+		cd rename-delete &&
+
+		test_expect_code 1 \
+			git merge-tree -z A^0 B^0 >out &&
+		echo >>out &&
+		anonymize_hash out >actual &&
+		q_to_tab <<-\EOF | lf_to_nul >expect &&
+		HASH
+		100644 HASH 1Qbar
+		100644 HASH 2Qbar
+		EOF
+
+		q_to_nul <<-EOF >>expect &&
+		Q2QbarQfooQCONFLICT (rename/delete)QCONFLICT (rename/delete): foo renamed to bar in A^0, but deleted in B^0.
+		Q1QbarQCONFLICT (modify/delete)QCONFLICT (modify/delete): bar deleted in B^0 and modified in A^0.  Version A^0 of bar left in tree.
+		Q
+		EOF
+		test_cmp expect actual
+	)
+'
+
+# rename/add handling
+#   Commit O: foo
+#   Commit A: modify foo, add different bar
+#   Commit B: modify & rename foo->bar
+#   Expected: CONFLICT(add/add) [via rename collide] for bar
+
+test_expect_success 'rename/add handling' '
+	# Setup
+	git init rename-add &&
+	(
+		cd rename-add &&
+		test_write_lines original 1 2 3 4 5 >foo &&
+		git add foo &&
+		git commit -m "original" &&
+
+		git branch O &&
+		git branch A &&
+		git branch B &&
+
+		git checkout A &&
+		test_write_lines 1 2 3 4 5 >foo &&
+		echo "different file" >bar &&
+		git add foo bar &&
+		git commit -m "Modify foo, add bar" &&
+
+		git checkout B &&
+		test_write_lines original 1 2 3 4 5 6 >foo &&
+		git add foo &&
+		git mv foo bar &&
+		git commit -m "rename foo to bar"
+	) &&
+	# Testing
+	(
+		cd rename-add &&
+
+		test_expect_code 1 \
+			git merge-tree -z A^0 B^0 >out &&
+		echo >>out &&
+
+		#
+		# First, check that the bar that appears at stage 3 does not
+		# correspond to an individual blob anywhere in history
+		#
+		hash=$(tr "\0" "\n" <out | head -n 3 | grep 3.bar | cut -f 2 -d " ") &&
+		git rev-list --objects --all >all_blobs &&
+		! grep $hash all_blobs &&
+
+		#
+		# Second, check anonymized hash output against expectation
+		#
+		anonymize_hash out >actual &&
+		q_to_tab <<-\EOF | lf_to_nul >expect &&
+		HASH
+		100644 HASH 2Qbar
+		100644 HASH 3Qbar
+		EOF
+
+		q_to_nul <<-EOF >>expect &&
+		Q1QbarQAuto-mergingQAuto-merging bar
+		Q1QbarQCONFLICT (contents)QCONFLICT (add/add): Merge conflict in bar
+		Q1QfooQAuto-mergingQAuto-merging foo
+		Q
+		EOF
+		test_cmp expect actual
+	)
+'
+
+# rename/add, where add is a mode conflict
+#   Commit O: foo
+#   Commit A: modify foo, add symlink bar
+#   Commit B: modify & rename foo->bar
+#   Expected: CONFLICT(distinct modes) for bar
+
+test_expect_success SYMLINKS 'rename/add, where add is a mode conflict' '
+	# Setup
+	git init rename-add-symlink &&
+	(
+		cd rename-add-symlink &&
+		test_write_lines original 1 2 3 4 5 >foo &&
+		git add foo &&
+		git commit -m "original" &&
+
+		git branch O &&
+		git branch A &&
+		git branch B &&
+
+		git checkout A &&
+		test_write_lines 1 2 3 4 5 >foo &&
+		ln -s foo bar &&
+		git add foo bar &&
+		git commit -m "Modify foo, add symlink bar" &&
+
+		git checkout B &&
+		test_write_lines original 1 2 3 4 5 6 >foo &&
+		git add foo &&
+		git mv foo bar &&
+		git commit -m "rename foo to bar"
+	) &&
+	# Testing
+	(
+		cd rename-add-symlink &&
+
+		test_expect_code 1 \
+			git merge-tree -z A^0 B^0 >out &&
+		echo >>out &&
+
+		#
+		# First, check that the bar that appears at stage 3 does not
+		# correspond to an individual blob anywhere in history
+		#
+		hash=$(tr "\0" "\n" <out | head -n 3 | grep 3.bar | cut -f 2 -d " ") &&
+		git rev-list --objects --all >all_blobs &&
+		! grep $hash all_blobs &&
+
+		#
+		# Second, check anonymized hash output against expectation
+		#
+		anonymize_hash out >actual &&
+		q_to_tab <<-\EOF | lf_to_nul >expect &&
+		HASH
+		120000 HASH 2Qbar
+		100644 HASH 3Qbar~B^0
+		EOF
+
+		q_to_nul <<-EOF >>expect &&
+		Q2QbarQbar~B^0QCONFLICT (distinct modes)QCONFLICT (distinct types): bar had different types on each side; renamed one of them so each can be recorded somewhere.
+		Q1QfooQAuto-mergingQAuto-merging foo
+		Q
+		EOF
+		test_cmp expect actual
+	)
+'
+
+# rename/rename(1to2) + content conflict handling
+#   Commit O: foo
+#   Commit A: modify foo & rename to bar
+#   Commit B: modify foo & rename to baz
+#   Expected: CONFLICT(rename/rename)
+
+test_expect_success 'rename/rename + content conflict' '
+	# Setup
+	git init rr-plus-content &&
+	(
+		cd rr-plus-content &&
+		test_write_lines 1 2 3 4 5 >foo &&
+		git add foo &&
+		git commit -m "original" &&
+
+		git branch O &&
+		git branch A &&
+		git branch B &&
+
+		git checkout A &&
+		test_write_lines 1 2 3 4 5 six >foo &&
+		git add foo &&
+		git mv foo bar &&
+		git commit -m "Modify foo + rename to bar" &&
+
+		git checkout B &&
+		test_write_lines 1 2 3 4 5 6 >foo &&
+		git add foo &&
+		git mv foo baz &&
+		git commit -m "Modify foo + rename to baz"
+	) &&
+	# Testing
+	(
+		cd rr-plus-content &&
+
+		test_expect_code 1 \
+			git merge-tree -z A^0 B^0 >out &&
+		echo >>out &&
+		anonymize_hash out >actual &&
+		q_to_tab <<-\EOF | lf_to_nul >expect &&
+		HASH
+		100644 HASH 2Qbar
+		100644 HASH 3Qbaz
+		100644 HASH 1Qfoo
+		EOF
+
+		q_to_nul <<-EOF >>expect &&
+		Q1QfooQAuto-mergingQAuto-merging foo
+		Q3QfooQbarQbazQCONFLICT (rename/rename)QCONFLICT (rename/rename): foo renamed to bar in A^0 and to baz in B^0.
+		Q
+		EOF
+		test_cmp expect actual
+	)
+'
+
+# rename/add/delete
+#   Commit O: foo
+#   Commit A: rm foo, add different bar
+#   Commit B: rename foo->bar
+#   Expected: CONFLICT (rename/delete), CONFLICT(add/add) [via rename collide]
+#             for bar
+
+test_expect_success 'rename/add/delete conflict' '
+	# Setup
+	git init rad &&
+	(
+		cd rad &&
+		echo "original file" >foo &&
+		git add foo &&
+		git commit -m "original" &&
+
+		git branch O &&
+		git branch A &&
+		git branch B &&
+
+		git checkout A &&
+		git rm foo &&
+		echo "different file" >bar &&
+		git add bar &&
+		git commit -m "Remove foo, add bar" &&
+
+		git checkout B &&
+		git mv foo bar &&
+		git commit -m "rename foo to bar"
+	) &&
+	# Testing
+	(
+		cd rad &&
+
+		test_expect_code 1 \
+			git merge-tree -z B^0 A^0 >out &&
+		echo >>out &&
+		anonymize_hash out >actual &&
+
+		q_to_tab <<-\EOF | lf_to_nul >expect &&
+		HASH
+		100644 HASH 2Qbar
+		100644 HASH 3Qbar
+
+		EOF
+
+		q_to_nul <<-EOF >>expect &&
+		2QbarQfooQCONFLICT (rename/delete)QCONFLICT (rename/delete): foo renamed to bar in B^0, but deleted in A^0.
+		Q1QbarQAuto-mergingQAuto-merging bar
+		Q1QbarQCONFLICT (contents)QCONFLICT (add/add): Merge conflict in bar
+		Q
+		EOF
+		test_cmp expect actual
+	)
+'
+
+# rename/rename(2to1)/delete/delete
+#   Commit O: foo, bar
+#   Commit A: rename foo->baz, rm bar
+#   Commit B: rename bar->baz, rm foo
+#   Expected: 2x CONFLICT (rename/delete), CONFLICT (add/add) via colliding
+#             renames for baz
+
+test_expect_success 'rename/rename(2to1)/delete/delete conflict' '
+	# Setup
+	git init rrdd &&
+	(
+		cd rrdd &&
+		echo foo >foo &&
+		echo bar >bar &&
+		git add foo bar &&
+		git commit -m O &&
+
+		git branch O &&
+		git branch A &&
+		git branch B &&
+
+		git checkout A &&
+		git mv foo baz &&
+		git rm bar &&
+		git commit -m "Rename foo, remove bar" &&
+
+		git checkout B &&
+		git mv bar baz &&
+		git rm foo &&
+		git commit -m "Rename bar, remove foo"
+	) &&
+	# Testing
+	(
+		cd rrdd &&
+
+		test_expect_code 1 \
+			git merge-tree -z A^0 B^0 >out &&
+		echo >>out &&
+		anonymize_hash out >actual &&
+
+		q_to_tab <<-\EOF | lf_to_nul >expect &&
+		HASH
+		100644 HASH 2Qbaz
+		100644 HASH 3Qbaz
+
+		EOF
+
+		q_to_nul <<-EOF >>expect &&
+		2QbazQbarQCONFLICT (rename/delete)QCONFLICT (rename/delete): bar renamed to baz in B^0, but deleted in A^0.
+		Q2QbazQfooQCONFLICT (rename/delete)QCONFLICT (rename/delete): foo renamed to baz in A^0, but deleted in B^0.
+		Q1QbazQAuto-mergingQAuto-merging baz
+		Q1QbazQCONFLICT (contents)QCONFLICT (add/add): Merge conflict in baz
+		Q
+		EOF
+		test_cmp expect actual
+	)
+'
+
+# mod6: chains of rename/rename(1to2) + add/add via colliding renames
+#   Commit O: one,      three,       five
+#   Commit A: one->two, three->four, five->six
+#   Commit B: one->six, three->two,  five->four
+#   Expected: three CONFLICT(rename/rename) messages + three CONFLICT(add/add)
+#             messages; each path in two of the multi-way merged contents
+#             found in two, four, six
+
+test_expect_success 'mod6: chains of rename/rename(1to2) and add/add via colliding renames' '
+	# Setup
+	git init mod6 &&
+	(
+		cd mod6 &&
+		test_seq 11 19 >one &&
+		test_seq 31 39 >three &&
+		test_seq 51 59 >five &&
+		git add . &&
+		test_tick &&
+		git commit -m "O" &&
+
+		git branch O &&
+		git branch A &&
+		git branch B &&
+
+		git checkout A &&
+		test_seq 10 19 >one &&
+		echo 40        >>three &&
+		git add one three &&
+		git mv  one   two  &&
+		git mv  three four &&
+		git mv  five  six  &&
+		test_tick &&
+		git commit -m "A" &&
+
+		git checkout B &&
+		echo 20    >>one       &&
+		echo forty >>three     &&
+		echo 60    >>five      &&
+		git add one three five &&
+		git mv  one   six  &&
+		git mv  three two  &&
+		git mv  five  four &&
+		test_tick &&
+		git commit -m "B"
+	) &&
+	# Testing
+	(
+		cd mod6 &&
+
+		test_expect_code 1 \
+			git merge-tree -z A^0 B^0 >out &&
+		echo >>out &&
+
+		#
+		# First, check that some of the hashes that appear as stage
+		# conflict entries do not appear as individual blobs anywhere
+		# in history.
+		#
+		hash1=$(tr "\0" "\n" <out | head | grep 2.four | cut -f 2 -d " ") &&
+		hash2=$(tr "\0" "\n" <out | head | grep 3.two | cut -f 2 -d " ") &&
+		git rev-list --objects --all >all_blobs &&
+		! grep $hash1 all_blobs &&
+		! grep $hash2 all_blobs &&
+
+		#
+		# Now compare anonymized hash output with expectation
+		#
+		anonymize_hash out >actual &&
+		q_to_tab <<-\EOF | lf_to_nul >expect &&
+		HASH
+		100644 HASH 1Qfive
+		100644 HASH 2Qfour
+		100644 HASH 3Qfour
+		100644 HASH 1Qone
+		100644 HASH 2Qsix
+		100644 HASH 3Qsix
+		100644 HASH 1Qthree
+		100644 HASH 2Qtwo
+		100644 HASH 3Qtwo
+
+		EOF
+
+		q_to_nul <<-EOF >>expect &&
+		3QfiveQsixQfourQCONFLICT (rename/rename)QCONFLICT (rename/rename): five renamed to six in A^0 and to four in B^0.
+		Q1QfourQAuto-mergingQAuto-merging four
+		Q1QfourQCONFLICT (contents)QCONFLICT (add/add): Merge conflict in four
+		Q1QoneQAuto-mergingQAuto-merging one
+		Q3QoneQtwoQsixQCONFLICT (rename/rename)QCONFLICT (rename/rename): one renamed to two in A^0 and to six in B^0.
+		Q1QsixQAuto-mergingQAuto-merging six
+		Q1QsixQCONFLICT (contents)QCONFLICT (add/add): Merge conflict in six
+		Q1QthreeQAuto-mergingQAuto-merging three
+		Q3QthreeQfourQtwoQCONFLICT (rename/rename)QCONFLICT (rename/rename): three renamed to four in A^0 and to two in B^0.
+		Q1QtwoQAuto-mergingQAuto-merging two
+		Q1QtwoQCONFLICT (contents)QCONFLICT (add/add): Merge conflict in two
+		Q
+		EOF
+		test_cmp expect actual
+	)
+'
+
+# directory rename + rename/delete + modify/delete + directory/file conflict
+#   Commit O: foo, olddir/{a,b,c}
+#   Commit A: delete foo, rename olddir/ -> newdir/, add newdir/bar/file
+#   Commit B: modify foo & rename foo -> olddir/bar
+#   Expected: CONFLICT(content) for newdir/bar (not olddir/bar or foo)
+
+test_expect_success 'directory rename + rename/delete + modify/delete + directory/file conflict' '
+	# Setup
+	git init 4-stacked-conflict &&
+	(
+		cd 4-stacked-conflict &&
+		test_write_lines 1 2 3 4 5 >foo &&
+		mkdir olddir &&
+		for i in a b c; do echo $i >olddir/$i || exit 1; done &&
+		git add foo olddir &&
+		git commit -m "original" &&
+
+		git branch O &&
+		git branch A &&
+		git branch B &&
+
+		git checkout A &&
+		git rm foo &&
+		git mv olddir newdir &&
+		mkdir newdir/bar &&
+		>newdir/bar/file &&
+		git add newdir/bar/file &&
+		git commit -m "rm foo, olddir/ -> newdir/, + newdir/bar/file" &&
+
+		git checkout B &&
+		test_write_lines 1 2 3 4 5 6 >foo &&
+		git add foo &&
+		git mv foo olddir/bar &&
+		git commit -m "Modify foo & rename foo -> olddir/bar"
+	) &&
+	# Testing
+	(
+		cd 4-stacked-conflict &&
+
+		test_expect_code 1 \
+			git merge-tree -z A^0 B^0 >out &&
+		echo >>out &&
+		anonymize_hash out >actual &&
+
+		q_to_tab <<-\EOF | lf_to_nul >expect &&
+		HASH
+		100644 HASH 1Qnewdir/bar~B^0
+		100644 HASH 3Qnewdir/bar~B^0
+		EOF
+
+		q_to_nul <<-EOF >>expect &&
+		Q2Qnewdir/barQolddir/barQCONFLICT (directory rename suggested)QCONFLICT (file location): foo renamed to olddir/bar in B^0, inside a directory that was renamed in A^0, suggesting it should perhaps be moved to newdir/bar.
+		Q2Qnewdir/barQfooQCONFLICT (rename/delete)QCONFLICT (rename/delete): foo renamed to newdir/bar in B^0, but deleted in A^0.
+		Q2Qnewdir/bar~B^0Qnewdir/barQCONFLICT (file/directory)QCONFLICT (file/directory): directory in the way of newdir/bar from B^0; moving it to newdir/bar~B^0 instead.
+		Q1Qnewdir/bar~B^0QCONFLICT (modify/delete)QCONFLICT (modify/delete): newdir/bar~B^0 deleted in A^0 and modified in B^0.  Version B^0 of newdir/bar~B^0 left in tree.
+		Q
+		EOF
+		test_cmp expect actual
+	)
+'
+
+for opt in $(git merge-tree --git-completion-helper-all)
+do
+	if test $opt = "--trivial-merge" || test $opt = "--write-tree"
+	then
+		continue
+	fi
+
+	test_expect_success "usage: --trivial-merge is incompatible with $opt" '
+		test_expect_code 128 git merge-tree --trivial-merge $opt side1 side2 side3
+	'
+done
+
+test_expect_success 'Just the conflicted files without the messages' '
+	test_expect_code 1 git merge-tree --write-tree --no-messages --name-only side1 side2 >out &&
+	anonymize_hash out >actual &&
+
+	test_write_lines HASH greeting whatever~side1 >expect &&
+
+	test_cmp expect actual
+'
+
+test_expect_success 'Check conflicted oids and modes without messages' '
+	test_expect_code 1 git merge-tree --write-tree --no-messages side1 side2 >out &&
+	anonymize_hash out >actual &&
+
+	# Compare the basic output format
+	q_to_tab >expect <<-\EOF &&
+	HASH
+	100644 HASH 1Qgreeting
+	100644 HASH 2Qgreeting
+	100644 HASH 3Qgreeting
+	100644 HASH 1Qwhatever~side1
+	100644 HASH 2Qwhatever~side1
+	EOF
+
+	test_cmp expect actual &&
+
+	# Check the actual hashes against the `ls-files -u` output too
+	tail -n +2 out | sed -e s/side1/HEAD/ >actual &&
+	test_cmp conflicted-file-info actual
+'
+
+test_expect_success 'NUL terminated conflicted file "lines"' '
+	git checkout -b tweak1 side1 &&
+	test_write_lines zero 1 2 3 4 5 6 >numbers &&
+	git add numbers &&
+	git mv numbers "Αυτά μου φαίνονται κινέζικα" &&
+	git commit -m "Renamed numbers" &&
+
+	test_expect_code 1 git merge-tree --write-tree -z tweak1 side2 >out &&
+	echo >>out &&
+	anonymize_hash out >actual &&
+
+	# Expected results:
+	#   "greeting" should merge with conflicts
+	#   "whatever" has *both* a modify/delete and a file/directory conflict
+	#   "Αυτά μου φαίνονται κινέζικα" should have a conflict
+	echo HASH | lf_to_nul >expect &&
+
+	q_to_tab <<-EOF | lf_to_nul >>expect &&
+	100644 HASH 1Qgreeting
+	100644 HASH 2Qgreeting
+	100644 HASH 3Qgreeting
+	100644 HASH 1Qwhatever~tweak1
+	100644 HASH 2Qwhatever~tweak1
+	100644 HASH 1QΑυτά μου φαίνονται κινέζικα
+	100644 HASH 2QΑυτά μου φαίνονται κινέζικα
+	100644 HASH 3QΑυτά μου φαίνονται κινέζικα
+
+	EOF
+
+	q_to_nul <<-EOF >>expect &&
+	1QgreetingQAuto-mergingQAuto-merging greeting
+	Q1QgreetingQCONFLICT (contents)QCONFLICT (content): Merge conflict in greeting
+	Q2Qwhatever~tweak1QwhateverQCONFLICT (file/directory)QCONFLICT (file/directory): directory in the way of whatever from tweak1; moving it to whatever~tweak1 instead.
+	Q1Qwhatever~tweak1QCONFLICT (modify/delete)QCONFLICT (modify/delete): whatever~tweak1 deleted in side2 and modified in tweak1.  Version tweak1 of whatever~tweak1 left in tree.
+	Q1QΑυτά μου φαίνονται κινέζικαQAuto-mergingQAuto-merging Αυτά μου φαίνονται κινέζικα
+	Q1QΑυτά μου φαίνονται κινέζικαQCONFLICT (contents)QCONFLICT (content): Merge conflict in Αυτά μου φαίνονται κινέζικα
+	Q
+	EOF
+
+	test_cmp expect actual
+'
+
+test_expect_success 'error out by default for unrelated histories' '
+	test_expect_code 128 git merge-tree --write-tree side1 unrelated 2>error &&
+
+	grep "refusing to merge unrelated histories" error
+'
+
+test_expect_success 'can override merge of unrelated histories' '
+	git merge-tree --write-tree --allow-unrelated-histories side1 unrelated >tree &&
+	TREE=$(cat tree) &&
+
+	git rev-parse side1:numbers side1:greeting side1:whatever unrelated:something-else >expect &&
+	git rev-parse $TREE:numbers $TREE:greeting $TREE:whatever $TREE:something-else >actual &&
+
+	test_cmp expect actual
+'
+
+test_expect_success SANITY 'merge-ort fails gracefully in a read-only repository' '
+	git init --bare read-only &&
+	git push read-only side1 side2 side3 &&
+	test_when_finished "chmod -R u+w read-only" &&
+	chmod -R a-w read-only &&
+	test_must_fail git -C read-only merge-tree side1 side3 &&
+	test_must_fail git -C read-only merge-tree side1 side2
+'
+
+test_expect_success '--stdin with both a successful and a conflicted merge' '
+	printf "side1 side3\nside1 side2" | git merge-tree --stdin >actual &&
+
+	git checkout side1^0 &&
+	git merge side3 &&
+
+	printf "1\0" >expect &&
+	git rev-parse HEAD^{tree} | lf_to_nul >>expect &&
+	printf "\0" >>expect &&
+
+	git checkout side1^0 &&
+	test_must_fail git merge side2 &&
+	sed s/HEAD/side1/ greeting >tmp &&
+	mv tmp greeting &&
+	git add -u &&
+	git mv whatever~HEAD whatever~side1 &&
+
+	printf "0\0" >>expect &&
+	git write-tree | lf_to_nul >>expect &&
+
+	cat <<-EOF | q_to_tab | lf_to_nul >>expect &&
+	100644 $(git rev-parse side1~1:greeting) 1Qgreeting
+	100644 $(git rev-parse side1:greeting) 2Qgreeting
+	100644 $(git rev-parse side2:greeting) 3Qgreeting
+	100644 $(git rev-parse side1~1:whatever) 1Qwhatever~side1
+	100644 $(git rev-parse side1:whatever) 2Qwhatever~side1
+	EOF
+
+	q_to_nul <<-EOF >>expect &&
+	Q1QgreetingQAuto-mergingQAuto-merging greeting
+	Q1QgreetingQCONFLICT (contents)QCONFLICT (content): Merge conflict in greeting
+	Q1QnumbersQAuto-mergingQAuto-merging numbers
+	Q2Qwhatever~side1QwhateverQCONFLICT (file/directory)QCONFLICT (file/directory): directory in the way of whatever from side1; moving it to whatever~side1 instead.
+	Q1Qwhatever~side1QCONFLICT (modify/delete)QCONFLICT (modify/delete): whatever~side1 deleted in side2 and modified in side1.  Version side1 of whatever~side1 left in tree.
+	EOF
+
+	printf "\0\0" >>expect &&
+
+	test_cmp expect actual
+'
+
+
+test_expect_success '--merge-base is incompatible with --stdin' '
+	test_must_fail git merge-tree --merge-base=side1 --stdin 2>expect &&
+
+	grep "^fatal: .*merge-base.*stdin.* cannot be used together" expect
+'
+
+# specify merge-base as parent of branch2
+# git merge-tree --write-tree --merge-base=c2 c1 c3
+#   Commit c1: add file1
+#   Commit c2: add file2 after c1
+#   Commit c3: add file3 after c2
+#   Expected: add file3, and file2 does NOT appear
+
+test_expect_success 'specify merge-base as parent of branch2' '
+	# Setup
+	test_when_finished "rm -rf base-b2-p" &&
+	git init base-b2-p &&
+	test_commit -C base-b2-p c1 file1 &&
+	test_commit -C base-b2-p c2 file2 &&
+	test_commit -C base-b2-p c3 file3 &&
+
+	# Testing
+	TREE_OID=$(git -C base-b2-p merge-tree --write-tree --merge-base=c2 c1 c3) &&
+
+	q_to_tab <<-EOF >expect &&
+	100644 blob $(git -C base-b2-p rev-parse c1:file1)Qfile1
+	100644 blob $(git -C base-b2-p rev-parse c3:file3)Qfile3
+	EOF
+
+	git -C base-b2-p ls-tree $TREE_OID >actual &&
+	test_cmp expect actual
+'
+
+# Since the earlier tests have verified that individual merge-tree calls
+# are doing the right thing, this test case is only used to verify that
+# we can also trigger merges via --stdin, and that when we do we get
+# the same answer as running a bunch of separate merges.
+
+test_expect_success 'check the input format when --stdin is passed' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	test_commit -C repo c1 &&
+	test_commit -C repo c2 &&
+	test_commit -C repo c3 &&
+	printf "c1 c3\nc2 -- c1 c3\nc2 c3" | git -C repo merge-tree --stdin >actual &&
+
+	printf "1\0" >expect &&
+	git -C repo merge-tree --write-tree -z c1 c3 >>expect &&
+	printf "\0" >>expect &&
+
+	printf "1\0" >>expect &&
+	git -C repo merge-tree --write-tree -z --merge-base=c2 c1 c3 >>expect &&
+	printf "\0" >>expect &&
+
+	printf "1\0" >>expect &&
+	git -C repo merge-tree --write-tree -z c2 c3 >>expect &&
+	printf "\0" >>expect &&
+
+	test_cmp expect actual
+'
+
+test_expect_success '--merge-base with tree OIDs' '
+	git merge-tree --merge-base=side1^ side1 side3 >with-commits &&
+	git merge-tree --merge-base=side1^^{tree} side1^{tree} side3^{tree} >with-trees &&
+	test_cmp with-commits with-trees
+'
+
+test_expect_success 'error out on missing tree objects' '
+	git init --bare missing-tree.git &&
+	git rev-list side3 >list &&
+	git rev-parse side3^: >>list &&
+	git pack-objects missing-tree.git/objects/pack/side3-tree-is-missing <list &&
+	side3=$(git rev-parse side3) &&
+	test_must_fail git --git-dir=missing-tree.git merge-tree $side3^ $side3 >actual 2>err &&
+	test_grep "Could not read $(git rev-parse $side3:)" err &&
+	test_must_be_empty actual
+'
+
+test_expect_success 'error out on missing blob objects' '
+	echo 1 | git hash-object -w --stdin >blob1 &&
+	echo 2 | git hash-object -w --stdin >blob2 &&
+	echo 3 | git hash-object -w --stdin >blob3 &&
+	printf "100644 blob $(cat blob1)\tblob\n" | git mktree >tree1 &&
+	printf "100644 blob $(cat blob2)\tblob\n" | git mktree >tree2 &&
+	printf "100644 blob $(cat blob3)\tblob\n" | git mktree >tree3 &&
+	git init --bare missing-blob.git &&
+	cat blob1 blob3 tree1 tree2 tree3 |
+	git pack-objects missing-blob.git/objects/pack/side1-whatever-is-missing &&
+	test_must_fail git --git-dir=missing-blob.git >actual 2>err \
+		merge-tree --merge-base=$(cat tree1) $(cat tree2) $(cat tree3) &&
+	test_grep "unable to read blob object $(cat blob2)" err &&
+	test_must_be_empty actual
+'
+
+test_expect_success 'error out on missing commits as well' '
+	git init --bare missing-commit.git &&
+	git rev-list --objects side1 side3 >list-including-initial &&
+	grep -v ^$(git rev-parse side1^) <list-including-initial >list &&
+	git pack-objects missing-commit.git/objects/pack/missing-initial <list &&
+	side1=$(git rev-parse side1) &&
+	side3=$(git rev-parse side3) &&
+	test_must_fail git --git-dir=missing-commit.git \
+		merge-tree --allow-unrelated-histories $side1 $side3 >actual &&
+	test_must_be_empty actual
+'
+
+test_done
diff --git a/t/t5000-tar-tree.sh b/t/t5000-tar-tree.sh
index 37655a2..72b8d0f 100755
--- a/t/t5000-tar-tree.sh
+++ b/t/t5000-tar-tree.sh
@@ -24,6 +24,7 @@ commit id embedding:
 
 '
 
+TEST_CREATE_REPO_NO_TEMPLATE=1
 . ./test-lib.sh
 
 SUBSTFORMAT=%H%n
@@ -77,7 +78,7 @@ check_tar() {
 					path=$(get_pax_header $header path) &&
 					if test -n "$path"
 					then
-						mv "$data" "$path"
+						mv "$data" "$path" || exit 1
 					fi
 				fi
 			done
@@ -94,6 +95,28 @@ check_tar() {
 	'
 }
 
+check_added() {
+	dir=$1
+	path_in_fs=$2
+	path_in_archive=$3
+
+	test_expect_success " validate extra file $path_in_archive" '
+		diff -r $path_in_fs $dir/$path_in_archive
+	'
+}
+
+check_mtime() {
+	dir=$1
+	path_in_archive=$2
+	mtime=$3
+
+	test_expect_success " validate mtime of $path_in_archive" '
+		test-tool chmtime --get $dir/$path_in_archive >actual.mtime &&
+		echo $mtime >expect.mtime &&
+		test_cmp expect.mtime actual.mtime
+	'
+}
+
 test_expect_success 'setup' '
 	test_oid_cache <<-EOF
 	obj sha1:19f9c8273ec45a8938e6999cb59b3ff66739902a
@@ -101,29 +124,49 @@ test_expect_success 'setup' '
 	EOF
 '
 
-test_expect_success \
-    'populate workdir' \
-    'mkdir a &&
-     echo simple textfile >a/a &&
-     ten=0123456789 && hundred=$ten$ten$ten$ten$ten$ten$ten$ten$ten$ten &&
-     echo long filename >a/four$hundred &&
-     mkdir a/bin &&
-     test-tool genrandom "frotz" 500000 >a/bin/sh &&
-     printf "A\$Format:%s\$O" "$SUBSTFORMAT" >a/substfile1 &&
-     printf "A not substituted O" >a/substfile2 &&
-     if test_have_prereq SYMLINKS; then
-	ln -s a a/l1
-     else
-	printf %s a > a/l1
-     fi &&
-     (p=long_path_to_a_file && cd a &&
-      for depth in 1 2 3 4 5; do mkdir $p && cd $p; done &&
-      echo text >file_with_long_path) &&
-     (cd a && find .) | sort >a.lst'
+test_expect_success '--list notices extra parameters' '
+	test_must_fail git archive --list blah &&
+	test_must_fail git archive --remote=. --list blah
+'
+
+test_expect_success 'end-of-options is correctly eaten' '
+	git archive --list --end-of-options &&
+	git archive --remote=. --list --end-of-options
+'
+
+test_expect_success 'populate workdir' '
+	mkdir a &&
+	echo simple textfile >a/a &&
+	ten=0123456789 &&
+	hundred="$ten$ten$ten$ten$ten$ten$ten$ten$ten$ten" &&
+	echo long filename >"a/four$hundred" &&
+	mkdir a/bin &&
+	test-tool genrandom "frotz" 500000 >a/bin/sh &&
+	printf "A\$Format:%s\$O" "$SUBSTFORMAT" >a/substfile1 &&
+	printf "A not substituted O" >a/substfile2 &&
+	if test_have_prereq SYMLINKS
+	then
+		ln -s a a/l1
+	else
+		printf %s a >a/l1
+	fi &&
+	(
+		p=long_path_to_a_file &&
+		cd a &&
+		for depth in 1 2 3 4 5
+		do
+			mkdir $p &&
+			cd $p || exit 1
+		done &&
+		echo text >file_with_long_path
+	) &&
+	(cd a && find .) | sort >a.lst
+'
 
 test_expect_success \
     'add ignored file' \
     'echo ignore me >a/ignored &&
+     mkdir .git/info &&
      echo ignored export-ignore >.git/info/attributes'
 
 test_expect_success 'add files to repository' '
@@ -137,20 +180,29 @@ test_expect_success 'setup export-subst' '
 		>a/substfile1
 '
 
-test_expect_success \
-    'create bare clone' \
-    'git clone --bare . bare.git &&
-     cp .git/info/attributes bare.git/info/attributes'
+test_expect_success 'create bare clone' '
+	git clone --template= --bare . bare.git &&
+	mkdir bare.git/info &&
+	cp .git/info/attributes bare.git/info/attributes
+'
 
-test_expect_success \
-    'remove ignored file' \
-    'rm a/ignored'
+test_expect_success 'remove ignored file' '
+	rm a/ignored
+'
 
-test_expect_success \
-    'git archive' \
-    'git archive HEAD >b.tar'
+test_expect_success 'git archive' '
+	git archive HEAD >b.tar
+'
 
 check_tar b
+check_mtime b a/a 1117231200
+
+test_expect_success 'git archive --mtime' '
+	git archive --mtime=2002-02-02T02:02:02-0200 HEAD >with_mtime.tar
+'
+
+check_tar with_mtime
+check_mtime with_mtime a/a 1012622522
 
 test_expect_success 'git archive --prefix=prefix/' '
 	git archive --prefix=prefix/ HEAD >with_prefix.tar
@@ -164,27 +216,48 @@ test_expect_success 'git-archive --prefix=olde-' '
 
 check_tar with_olde-prefix olde-
 
+test_expect_success 'git archive --add-file' '
+	echo untracked >untracked &&
+	git archive --add-file=untracked HEAD >with_untracked.tar
+'
+
+check_tar with_untracked
+check_added with_untracked untracked untracked
+
+test_expect_success 'git archive --add-file twice' '
+	echo untracked >untracked &&
+	git archive --prefix=one/ --add-file=untracked \
+		--prefix=two/ --add-file=untracked \
+		--prefix= HEAD >with_untracked2.tar
+'
+
+check_tar with_untracked2
+check_added with_untracked2 untracked one/untracked
+check_added with_untracked2 untracked two/untracked
+
 test_expect_success 'git archive on large files' '
-    test_config core.bigfilethreshold 1 &&
-    git archive HEAD >b3.tar &&
-    test_cmp_bin b.tar b3.tar
+	test_config core.bigfilethreshold 1 &&
+	git archive HEAD >b3.tar &&
+	test_cmp_bin b.tar b3.tar
 '
 
-test_expect_success \
-    'git archive in a bare repo' \
-    '(cd bare.git && git archive HEAD) >b3.tar'
+test_expect_success 'git archive in a bare repo' '
+	git --git-dir bare.git archive HEAD >b3.tar
+'
 
-test_expect_success \
-    'git archive vs. the same in a bare repo' \
-    'test_cmp_bin b.tar b3.tar'
+test_expect_success 'git archive vs. the same in a bare repo' '
+	test_cmp_bin b.tar b3.tar
+'
 
-test_expect_success 'git archive with --output' \
-    'git archive --output=b4.tar HEAD &&
-    test_cmp_bin b.tar b4.tar'
+test_expect_success 'git archive with --output' '
+	git archive --output=b4.tar HEAD &&
+	test_cmp_bin b.tar b4.tar
+'
 
-test_expect_success 'git archive --remote' \
-    'git archive --remote=. HEAD >b5.tar &&
-    test_cmp_bin b.tar b5.tar'
+test_expect_success 'git archive --remote' '
+	git archive --remote=. HEAD >b5.tar &&
+	test_cmp_bin b.tar b5.tar
+'
 
 test_expect_success 'git archive --remote with configured remote' '
 	git config remote.foo.url . &&
@@ -195,18 +268,11 @@ test_expect_success 'git archive --remote with configured remote' '
 	test_cmp_bin b.tar b5-nick.tar
 '
 
-test_expect_success \
-    'validate file modification time' \
-    'mkdir extract &&
-     "$TAR" xf b.tar -C extract a/a &&
-     test-tool chmtime --get extract/a/a >b.mtime &&
-     echo "1117231200" >expected.mtime &&
-     test_cmp expected.mtime b.mtime'
-
-test_expect_success \
-    'git get-tar-commit-id' \
-    'git get-tar-commit-id <b.tar >b.commitid &&
-     test_cmp .git/$(git symbolic-ref HEAD) b.commitid'
+test_expect_success 'git get-tar-commit-id' '
+	git get-tar-commit-id <b.tar >actual &&
+	git rev-parse HEAD >expect &&
+	test_cmp expect actual
+'
 
 test_expect_success 'git archive with --output, override inferred format' '
 	git archive --format=tar --output=d4.zip HEAD &&
@@ -298,21 +364,28 @@ test_expect_success 'only enabled filters are available remotely' '
 	test_cmp_bin remote.bar config.bar
 '
 
-test_expect_success GZIP 'git archive --format=tgz' '
+test_expect_success 'invalid filter is reported only once' '
+	test_must_fail git -c tar.invalid.command= archive --format=invalid \
+		HEAD >out 2>err &&
+	test_must_be_empty out &&
+	test_line_count = 1 err
+'
+
+test_expect_success 'git archive --format=tgz' '
 	git archive --format=tgz HEAD >j.tgz
 '
 
-test_expect_success GZIP 'git archive --format=tar.gz' '
+test_expect_success 'git archive --format=tar.gz' '
 	git archive --format=tar.gz HEAD >j1.tar.gz &&
 	test_cmp_bin j.tgz j1.tar.gz
 '
 
-test_expect_success GZIP 'infer tgz from .tgz filename' '
+test_expect_success 'infer tgz from .tgz filename' '
 	git archive --output=j2.tgz HEAD &&
 	test_cmp_bin j.tgz j2.tgz
 '
 
-test_expect_success GZIP 'infer tgz from .tar.gz filename' '
+test_expect_success 'infer tgz from .tar.gz filename' '
 	git archive --output=j3.tar.gz HEAD &&
 	test_cmp_bin j.tgz j3.tar.gz
 '
@@ -322,24 +395,40 @@ test_expect_success GZIP 'extract tgz file' '
 	test_cmp_bin b.tar j.tar
 '
 
-test_expect_success GZIP 'remote tar.gz is allowed by default' '
+test_expect_success 'remote tar.gz is allowed by default' '
 	git archive --remote=. --format=tar.gz HEAD >remote.tar.gz &&
 	test_cmp_bin j.tgz remote.tar.gz
 '
 
-test_expect_success GZIP 'remote tar.gz can be disabled' '
+test_expect_success 'remote tar.gz can be disabled' '
 	git config tar.tar.gz.remote false &&
 	test_must_fail git archive --remote=. --format=tar.gz HEAD \
 		>remote.tar.gz
 '
 
+test_expect_success GZIP 'git archive --format=tgz (external gzip)' '
+	test_config tar.tgz.command "gzip -cn" &&
+	git archive --format=tgz HEAD >external_gzip.tgz
+'
+
+test_expect_success GZIP 'git archive --format=tar.gz (external gzip)' '
+	test_config tar.tar.gz.command "gzip -cn" &&
+	git archive --format=tar.gz HEAD >external_gzip.tar.gz &&
+	test_cmp_bin external_gzip.tgz external_gzip.tar.gz
+'
+
+test_expect_success GZIP 'extract tgz file (external gzip)' '
+	gzip -d -c <external_gzip.tgz >external_gzip.tar &&
+	test_cmp_bin b.tar external_gzip.tar
+'
+
 test_expect_success 'archive and :(glob)' '
 	git archive -v HEAD -- ":(glob)**/sh" >/dev/null 2>actual &&
-	cat >expect <<EOF &&
-a/
-a/bin/
-a/bin/sh
-EOF
+	cat >expect <<-\EOF &&
+	a/
+	a/bin/
+	a/bin/sh
+	EOF
 	test_cmp expect actual
 '
 
@@ -347,6 +436,19 @@ test_expect_success 'catch non-matching pathspec' '
 	test_must_fail git archive -v HEAD -- "*.abc" >/dev/null
 '
 
+test_expect_success 'reject paths outside the current directory' '
+	test_must_fail git -C a/bin archive HEAD .. >/dev/null 2>err &&
+	grep "outside the current directory" err
+'
+
+test_expect_success 'allow pathspecs that resolve to the current directory' '
+	git -C a/bin archive -v HEAD ../bin >/dev/null 2>actual &&
+	cat >expect <<-\EOF &&
+	sh
+	EOF
+	test_cmp expect actual
+'
+
 # Pull the size and date of each entry in a tarfile using the system tar.
 #
 # We'll pull out only the year from the date; that avoids any question of
@@ -402,15 +504,33 @@ test_expect_success TAR_HUGE,LONG_IS_64BIT 'system tar can read our huge size' '
 	test_cmp expect actual
 '
 
-test_expect_success TIME_IS_64BIT 'set up repository with far-future commit' '
+test_expect_success TIME_IS_64BIT 'set up repository with far-future (2^34 - 1) commit' '
+	rm -f .git/index &&
+	echo foo >file &&
+	git add file &&
+	GIT_COMMITTER_DATE="@17179869183 +0000" \
+		git commit -m "tempori parendum"
+'
+
+test_expect_success TIME_IS_64BIT 'generate tar with far-future mtime' '
+	git archive HEAD >future.tar
+'
+
+test_expect_success TAR_HUGE,TIME_IS_64BIT,TIME_T_IS_64BIT 'system tar can read our future mtime' '
+	echo 2514 >expect &&
+	tar_info future.tar | cut -d" " -f2 >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success TIME_IS_64BIT 'set up repository with far-far-future (2^36 + 1) commit' '
 	rm -f .git/index &&
 	echo content >file &&
 	git add file &&
-	GIT_COMMITTER_DATE="@68719476737 +0000" \
+	GIT_TEST_COMMIT_GRAPH=0 GIT_COMMITTER_DATE="@68719476737 +0000" \
 		git commit -m "tempori parendum"
 '
 
-test_expect_success TIME_IS_64BIT 'generate tar with future mtime' '
+test_expect_success TIME_IS_64BIT 'generate tar with far-far-future mtime' '
 	git archive HEAD >future.tar
 '
 
diff --git a/t/t5001-archive-attr.sh b/t/t5001-archive-attr.sh
index e9aa971..eaf959d 100755
--- a/t/t5001-archive-attr.sh
+++ b/t/t5001-archive-attr.sh
@@ -2,6 +2,8 @@
 
 test_description='git archive attribute tests'
 
+TEST_CREATE_REPO_NO_TEMPLATE=1
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 SUBSTFORMAT='%H (%h)%n'
@@ -20,6 +22,7 @@ extract_tar_to_dir () {
 
 test_expect_success 'setup' '
 	echo ignored >ignored &&
+	mkdir .git/info &&
 	echo ignored export-ignore >>.git/info/attributes &&
 	git add ignored &&
 
@@ -30,6 +33,13 @@ test_expect_success 'setup' '
 	echo ignored-by-tree.d export-ignore >>.gitattributes &&
 	git add ignored-by-tree ignored-by-tree.d .gitattributes &&
 
+	mkdir subdir &&
+	>subdir/included &&
+	>subdir/ignored-by-subtree &&
+	>subdir/ignored-by-tree &&
+	echo ignored-by-subtree export-ignore >subdir/.gitattributes &&
+	git add subdir &&
+
 	echo ignored by worktree >ignored-by-worktree &&
 	echo ignored-by-worktree export-ignore >.gitattributes &&
 	git add ignored-by-worktree &&
@@ -46,7 +56,8 @@ test_expect_success 'setup' '
 
 	git commit -m. &&
 
-	git clone --bare . bare &&
+	git clone --template= --bare . bare &&
+	mkdir bare/info &&
 	cp .git/info/attributes bare/info/attributes
 '
 
@@ -89,6 +100,15 @@ test_expect_exists	archive-pathspec-wildcard/ignored-by-worktree
 test_expect_missing	archive-pathspec-wildcard/excluded-by-pathspec.d
 test_expect_missing	archive-pathspec-wildcard/excluded-by-pathspec.d/file
 
+test_expect_success 'git -C subdir archive' '
+	git -C subdir archive HEAD >archive-subdir.tar &&
+	extract_tar_to_dir archive-subdir
+'
+
+test_expect_exists	archive-subdir/included
+test_expect_missing	archive-subdir/ignored-by-subtree
+test_expect_missing	archive-subdir/ignored-by-tree
+
 test_expect_success 'git archive with worktree attributes' '
 	git archive --worktree-attributes HEAD >worktree.tar &&
 	(mkdir worktree && cd worktree && "$TAR" xf -) <worktree.tar
@@ -118,7 +138,7 @@ test_expect_success 'git archive with worktree attributes, bare' '
 '
 
 test_expect_missing	bare-worktree/ignored
-test_expect_exists	bare-worktree/ignored-by-tree
+test_expect_missing	bare-worktree/ignored-by-tree
 test_expect_exists	bare-worktree/ignored-by-worktree
 
 test_expect_success 'export-subst' '
@@ -128,4 +148,18 @@ test_expect_success 'export-subst' '
 	test_cmp substfile2 archive/substfile2
 '
 
+test_expect_success 'export-subst expands %(describe) once' '
+	echo "\$Format:%(describe)\$" >substfile3 &&
+	echo "\$Format:%(describe)\$" >>substfile3 &&
+	echo "\$Format:%(describe)${LF}%(describe)\$" >substfile4 &&
+	git add substfile[34] &&
+	git commit -m export-subst-describe &&
+	git tag -m export-subst-describe export-subst-describe &&
+	git archive HEAD >archive-describe.tar &&
+	extract_tar_to_dir archive-describe &&
+	desc=$(git describe) &&
+	grep -F "$desc" archive-describe/substfile[34] >substituted &&
+	test_line_count = 1 substituted
+'
+
 test_done
diff --git a/t/t5002-archive-attr-pattern.sh b/t/t5002-archive-attr-pattern.sh
index bda6d7d..78ab75f 100755
--- a/t/t5002-archive-attr-pattern.sh
+++ b/t/t5002-archive-attr-pattern.sh
@@ -2,6 +2,8 @@
 
 test_description='git archive attribute pattern tests'
 
+TEST_PASSES_SANITIZE_LEAK=true
+TEST_CREATE_REPO_NO_TEMPLATE=1
 . ./test-lib.sh
 
 test_expect_exists() {
@@ -14,6 +16,7 @@ test_expect_missing() {
 
 test_expect_success 'setup' '
 	echo ignored >ignored &&
+	mkdir .git/info &&
 	echo ignored export-ignore >>.git/info/attributes &&
 	git add ignored &&
 
@@ -53,7 +56,8 @@ test_expect_success 'setup' '
 
 	git commit -m. &&
 
-	git clone --bare . bare &&
+	git clone --template= --bare . bare &&
+	mkdir bare/info &&
 	cp .git/info/attributes bare/info/attributes
 '
 
diff --git a/t/t5003-archive-zip.sh b/t/t5003-archive-zip.sh
index 3b76d2e..961c6aa 100755
--- a/t/t5003-archive-zip.sh
+++ b/t/t5003-archive-zip.sh
@@ -2,6 +2,7 @@
 
 test_description='git archive --format=zip test'
 
+TEST_CREATE_REPO_NO_TEMPLATE=1
 . ./test-lib.sh
 
 SUBSTFORMAT=%H%n
@@ -72,6 +73,16 @@ check_zip() {
 	"
 }
 
+check_added() {
+	dir=$1
+	path_in_fs=$2
+	path_in_archive=$3
+
+	test_expect_success UNZIP " validate extra file $path_in_archive" '
+		diff -r $path_in_fs $dir/$path_in_archive
+	'
+}
+
 test_expect_success \
     'populate workdir' \
     'mkdir a &&
@@ -96,7 +107,7 @@ test_expect_success \
      printf "A\$Format:%s\$O" "$SUBSTFORMAT" >a/substfile1 &&
      printf "A not substituted O" >a/substfile2 &&
      (p=long_path_to_a_file && cd a &&
-      for depth in 1 2 3 4 5; do mkdir $p && cd $p; done &&
+      for depth in 1 2 3 4 5; do mkdir $p && cd $p || exit 1; done &&
       echo text >file_with_long_path)
 '
 
@@ -111,6 +122,7 @@ test_expect_success 'prepare file list' '
 test_expect_success \
     'add ignored file' \
     'echo ignore me >a/ignored &&
+     mkdir .git/info &&
      echo ignored export-ignore >.git/info/attributes'
 
 test_expect_success 'add files to repository' '
@@ -129,7 +141,8 @@ test_expect_success 'setup export-subst and diff attributes' '
 '
 
 test_expect_success 'create bare clone' '
-	git clone --bare . bare.git &&
+	git clone --template= --bare . bare.git &&
+	mkdir bare.git/info &&
 	cp .git/info/attributes bare.git/info/attributes &&
 	# Recreate our changes to .git/config rather than just copying it, as
 	# we do not want to clobber core.bare or other settings.
@@ -188,4 +201,76 @@ test_expect_success 'git archive --format=zip on large files' '
 
 check_zip large-compressed
 
+test_expect_success 'git archive --format=zip --add-file' '
+	echo untracked >untracked &&
+	git archive --format=zip --add-file=untracked HEAD >with_untracked.zip
+'
+
+check_zip with_untracked
+check_added with_untracked untracked untracked
+
+test_expect_success UNZIP 'git archive --format=zip --add-virtual-file' '
+	if test_have_prereq FUNNYNAMES
+	then
+		PATHNAME="pathname with : colon"
+	else
+		PATHNAME="pathname without colon"
+	fi &&
+	git archive --format=zip >with_file_with_content.zip \
+		--add-virtual-file=\""$PATHNAME"\": \
+		--add-virtual-file=hello:world $EMPTY_TREE &&
+	test_when_finished "rm -rf tmp-unpack" &&
+	mkdir tmp-unpack && (
+		cd tmp-unpack &&
+		"$GIT_UNZIP" ../with_file_with_content.zip &&
+		test_path_is_file hello &&
+		test_path_is_file "$PATHNAME" &&
+		test world = $(cat hello)
+	)
+'
+
+test_expect_success 'git archive --format=zip --add-file twice' '
+	echo untracked >untracked &&
+	git archive --format=zip --prefix=one/ --add-file=untracked \
+		--prefix=two/ --add-file=untracked \
+		--prefix= HEAD >with_untracked2.zip
+'
+check_zip with_untracked2
+check_added with_untracked2 untracked one/untracked
+check_added with_untracked2 untracked two/untracked
+
+# Test remote archive over HTTP protocol.
+#
+# Note: this should be the last part of this test suite, because
+# by including lib-httpd.sh, the test may end early if httpd tests
+# should not be run.
+#
+. "$TEST_DIRECTORY"/lib-httpd.sh
+start_httpd
+
+test_expect_success "setup for HTTP protocol" '
+	cp -R bare.git "$HTTPD_DOCUMENT_ROOT_PATH/bare.git" &&
+	git -C "$HTTPD_DOCUMENT_ROOT_PATH/bare.git" \
+		config http.uploadpack true &&
+	set_askpass user@host pass@host
+'
+
+setup_askpass_helper
+
+test_expect_success 'remote archive does not work with protocol v1' '
+	test_must_fail git -c protocol.version=1 archive \
+		--remote="$HTTPD_URL/auth/smart/bare.git" \
+		--output=remote-http.zip HEAD >actual 2>&1 &&
+	cat >expect <<-EOF &&
+	fatal: can${SQ}t connect to subservice git-upload-archive
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'archive remote http repository' '
+	git archive --remote="$HTTPD_URL/auth/smart/bare.git" \
+		--output=remote-http.zip HEAD &&
+	test_cmp_bin d.zip remote-http.zip
+'
+
 test_done
diff --git a/t/t5004-archive-corner-cases.sh b/t/t5004-archive-corner-cases.sh
index 3e7b23c..9f2c6da 100755
--- a/t/t5004-archive-corner-cases.sh
+++ b/t/t5004-archive-corner-cases.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='test corner cases of git-archive'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # the 10knuls.tar file is used to test for an empty git generated tar
@@ -131,7 +133,7 @@ test_expect_success ZIPINFO 'zip archive with many entries' '
 	do
 		for b in 0 1 2 3 4 5 6 7 8 9 a b c d e f
 		do
-			: >00/$a$b
+			: >00/$a$b || return 1
 		done
 	done &&
 	git add 00 &&
@@ -143,7 +145,7 @@ test_expect_success ZIPINFO 'zip archive with many entries' '
 	do
 		for d in 0 1 2 3 4 5 6 7 8 9 a b c d e f
 		do
-			echo "040000 tree $subtree	$c$d"
+			echo "040000 tree $subtree	$c$d" || return 1
 		done
 	done >tree &&
 	tree=$(git mktree <tree) &&
@@ -153,7 +155,8 @@ test_expect_success ZIPINFO 'zip archive with many entries' '
 
 	# check the number of entries in the ZIP file directory
 	expr 65536 + 256 >expect &&
-	"$ZIPINFO" many.zip | head -2 | sed -n "2s/.* //p" >actual &&
+	"$ZIPINFO" -h many.zip >zipinfo &&
+	sed -n "2s/.* //p" <zipinfo >actual &&
 	test_cmp expect actual
 '
 
@@ -170,7 +173,7 @@ test_expect_success EXPENSIVE,UNZIP,UNZIP_ZIP64_SUPPORT \
 	# create tree containing 65500 entries of that blob
 	for i in $(test_seq 1 65500)
 	do
-		echo "100644 blob $blob	$i"
+		echo "100644 blob $blob	$i" || return 1
 	done >tree &&
 	tree=$(git mktree <tree) &&
 
diff --git a/t/t5100-mailinfo.sh b/t/t5100-mailinfo.sh
index 147e616..c8d0655 100755
--- a/t/t5100-mailinfo.sh
+++ b/t/t5100-mailinfo.sh
@@ -70,7 +70,7 @@ test_expect_success 'respect NULs' '
 
 	git mailsplit -d3 -o. "$DATA/nul-plain" &&
 	test_cmp "$DATA/nul-plain" 001 &&
-	(cat 001 | git mailinfo msg patch) &&
+	git mailinfo msg patch <001 &&
 	test_line_count = 4 patch
 
 '
@@ -122,7 +122,7 @@ test_expect_success 'mailinfo unescapes with --mboxrd' '
 	do
 		git mailinfo mboxrd/msg mboxrd/patch \
 		  <mboxrd/$i >mboxrd/out &&
-		test_cmp "$DATA/${i}mboxrd" mboxrd/msg
+		test_cmp "$DATA/${i}mboxrd" mboxrd/msg || return 1
 	done &&
 	sp=" " &&
 	echo "From " >expect &&
@@ -201,13 +201,13 @@ test_expect_success 'mailinfo -b double [PATCH]' '
 	test z"$subj" = z"Subject: message"
 '
 
-test_expect_failure 'mailinfo -b trailing [PATCH]' '
+test_expect_success 'mailinfo -b trailing [PATCH]' '
 	subj="$(echo "Subject: [other] [PATCH] message" |
 		git mailinfo -b /dev/null /dev/null)" &&
 	test z"$subj" = z"Subject: [other] message"
 '
 
-test_expect_failure 'mailinfo -b separated double [PATCH]' '
+test_expect_success 'mailinfo -b separated double [PATCH]' '
 	subj="$(echo "Subject: [PATCH] [other] [PATCH] message" |
 		git mailinfo -b /dev/null /dev/null)" &&
 	test z"$subj" = z"Subject: [other] message"
@@ -228,4 +228,66 @@ test_expect_success 'mailinfo handles unusual header whitespace' '
 	test_cmp expect actual
 '
 
+check_quoted_cr_mail () {
+	mail="$1" && shift &&
+	git mailinfo -u "$@" "$mail.msg" "$mail.patch" \
+		<"$mail" >"$mail.info" 2>"$mail.err" &&
+	test_cmp "$mail-expected.msg" "$mail.msg" &&
+	test_cmp "$mail-expected.patch" "$mail.patch" &&
+	test_cmp "$DATA/quoted-cr-info" "$mail.info"
+}
+
+test_expect_success 'split base64 email with quoted-cr' '
+	mkdir quoted-cr &&
+	git mailsplit -oquoted-cr "$DATA/quoted-cr.mbox" >quoted-cr/last &&
+	test $(cat quoted-cr/last) = 2
+'
+
+test_expect_success 'mailinfo warn CR in base64 encoded email' '
+	sed -e "s/%%$//" -e "s/%%/$(printf \\015)/g" "$DATA/quoted-cr-msg" \
+		>quoted-cr/0001-expected.msg &&
+	sed "s/%%/$(printf \\015)/g" "$DATA/quoted-cr-msg" \
+		>quoted-cr/0002-expected.msg &&
+	sed -e "s/%%$//" -e "s/%%/$(printf \\015)/g" "$DATA/quoted-cr-patch" \
+		>quoted-cr/0001-expected.patch &&
+	sed "s/%%/$(printf \\015)/g" "$DATA/quoted-cr-patch" \
+		>quoted-cr/0002-expected.patch &&
+	check_quoted_cr_mail quoted-cr/0001 &&
+	test_must_be_empty quoted-cr/0001.err &&
+	check_quoted_cr_mail quoted-cr/0002 &&
+	grep "quoted CRLF detected" quoted-cr/0002.err &&
+	check_quoted_cr_mail quoted-cr/0001 --quoted-cr=nowarn &&
+	test_must_be_empty quoted-cr/0001.err &&
+	check_quoted_cr_mail quoted-cr/0002 --quoted-cr=nowarn &&
+	test_must_be_empty quoted-cr/0002.err &&
+	cp quoted-cr/0001-expected.msg quoted-cr/0002-expected.msg &&
+	cp quoted-cr/0001-expected.patch quoted-cr/0002-expected.patch &&
+	check_quoted_cr_mail quoted-cr/0001 --quoted-cr=strip &&
+	test_must_be_empty quoted-cr/0001.err &&
+	check_quoted_cr_mail quoted-cr/0002 --quoted-cr=strip &&
+	test_must_be_empty quoted-cr/0002.err
+'
+
+test_expect_success 'from line with unterminated quoted string' '
+	echo "From: bob \"unterminated string smith <bob@example.com>" >in &&
+	git mailinfo /dev/null /dev/null <in >actual &&
+	cat >expect <<-\EOF &&
+	Author: bob unterminated string smith
+	Email: bob@example.com
+
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'from line with unterminated comment' '
+	echo "From: bob (unterminated comment smith <bob@example.com>" >in &&
+	git mailinfo /dev/null /dev/null <in >actual &&
+	cat >expect <<-\EOF &&
+	Author: bob (unterminated comment smith
+	Email: bob@example.com
+
+	EOF
+	test_cmp expect actual
+'
+
 test_done
diff --git a/t/t5100/comment.expect b/t/t5100/comment.expect
index 7228177..bd71956 100644
--- a/t/t5100/comment.expect
+++ b/t/t5100/comment.expect
@@ -1,4 +1,4 @@
-Author: A U Thor (this is (really) a comment (honestly))
+Author: (this is (really) a "comment" (honestly)) A U Thor
 Email: somebody@example.com
 Subject: testing comments
 Date: Sun, 25 May 2008 00:38:18 -0700
diff --git a/t/t5100/comment.in b/t/t5100/comment.in
index c53a192..0b7e903 100644
--- a/t/t5100/comment.in
+++ b/t/t5100/comment.in
@@ -1,5 +1,5 @@
 From 1234567890123456789012345678901234567890 Mon Sep 17 00:00:00 2001
-From: "A U Thor" <somebody@example.com> (this is \(really\) a comment (honestly))
+From: (this is \(really\) a "comment" (honestly)) "A U Thor" <somebody@example.com>
 Date: Sun, 25 May 2008 00:38:18 -0700
 Subject: [PATCH] testing comments
 
diff --git a/t/t5100/msg0002 b/t/t5100/msg0002
index e2546ec..1089382 100644
--- a/t/t5100/msg0002
+++ b/t/t5100/msg0002
@@ -3,7 +3,7 @@ message:
 
 From: Nit Picker <nit.picker@example.net>
 Subject: foo is too old
-Message-Id: <nitpicker.12121212@example.net>
+Message-ID: <nitpicker.12121212@example.net>
 
 Hopefully this would fix the problem stated there.
 
diff --git a/t/t5100/msg0003 b/t/t5100/msg0003
index 1ac6810..3402b53 100644
--- a/t/t5100/msg0003
+++ b/t/t5100/msg0003
@@ -3,7 +3,7 @@ message:
 
 From: Nit Picker <nit.picker@example.net>
 Subject: foo is too old
-Message-Id: <nitpicker.12121212@example.net>
+Message-ID: <nitpicker.12121212@example.net>
 
 Hopefully this would fix the problem stated there.
 
diff --git a/t/t5100/msg0012--message-id b/t/t5100/msg0012--message-id
index 376e26e..4448295 100644
--- a/t/t5100/msg0012--message-id
+++ b/t/t5100/msg0012--message-id
@@ -5,4 +5,4 @@ docutils заменён на python-docutils
 python-docutils. В то время как сам rest2web не нужен.
 
 Signed-off-by: Dmitriy Blinov <bda@mnsspb.ru>
-Message-Id: <1226501681-24923-1-git-send-email-bda@mnsspb.ru>
+Message-ID: <1226501681-24923-1-git-send-email-bda@mnsspb.ru>
diff --git a/t/t5100/quoted-cr-info b/t/t5100/quoted-cr-info
new file mode 100644
index 0000000..dab2228
--- /dev/null
+++ b/t/t5100/quoted-cr-info
@@ -0,0 +1,5 @@
+Author: A U Thor
+Email: mail@example.com
+Subject: sample
+Date: Mon, 3 Aug 2020 22:40:55 +0700
+
diff --git a/t/t5100/quoted-cr-msg b/t/t5100/quoted-cr-msg
new file mode 100644
index 0000000..89b05a0
--- /dev/null
+++ b/t/t5100/quoted-cr-msg
@@ -0,0 +1,2 @@
+On different distro, %%pytest is suffixed with different patterns.%%
+%%
diff --git a/t/t5100/quoted-cr-patch b/t/t5100/quoted-cr-patch
new file mode 100644
index 0000000..65b13ee
--- /dev/null
+++ b/t/t5100/quoted-cr-patch
@@ -0,0 +1,22 @@
+---%%
+ configure | 2 +-%%
+ 1 file changed, 1 insertion(+), 1 deletion(-)%%
+%%
+diff --git a/configure b/configure%%
+index db3538b3..f7c1c095 100755%%
+--- a/configure%%
++++ b/configure%%
+@@ -814,7 +814,7 @@ if [ $have_python3 -eq 1 ]; then%%
+     printf "%%Checking for python3 pytest (>= 3.0)... "%%
+     conf=$(mktemp)%%
+     printf "[pytest]\nminversion=3.0\n" > $conf%%
+-    if pytest-3 -c $conf --version >/dev/null 2>&1; then%%
++    if "$python" -m pytest -c $conf --version >/dev/null 2>&1; then%%
+         printf "Yes.\n"%%
+         have_python3_pytest=1%%
+     else%%
+-- %%
+2.28.0%%
+_______________________________________________
+example mailing list -- list@example.org
+To unsubscribe send an email to list-leave@example.org
diff --git a/t/t5100/quoted-cr.mbox b/t/t5100/quoted-cr.mbox
new file mode 100644
index 0000000..a529d4d
--- /dev/null
+++ b/t/t5100/quoted-cr.mbox
@@ -0,0 +1,47 @@
+From nobody Mon Sep 17 00:00:00 2001
+From: A U Thor <mail@example.com>
+To: list@example.org
+Subject: [PATCH v2] sample
+Date: Mon,  3 Aug 2020 22:40:55 +0700
+Message-ID: <msg-id@example.com>
+Content-Type: text/plain; charset="utf-8"
+Content-Transfer-Encoding: base64
+
+T24gZGlmZmVyZW50IGRpc3RybywgDXB5dGVzdCBpcyBzdWZmaXhlZCB3aXRoIGRpZmZlcmVudCBw
+YXR0ZXJucy4KCi0tLQogY29uZmlndXJlIHwgMiArLQogMSBmaWxlIGNoYW5nZWQsIDEgaW5zZXJ0
+aW9uKCspLCAxIGRlbGV0aW9uKC0pCgpkaWZmIC0tZ2l0IGEvY29uZmlndXJlIGIvY29uZmlndXJl
+CmluZGV4IGRiMzUzOGIzLi5mN2MxYzA5NSAxMDA3NTUKLS0tIGEvY29uZmlndXJlCisrKyBiL2Nv
+bmZpZ3VyZQpAQCAtODE0LDcgKzgxNCw3IEBAIGlmIFsgJGhhdmVfcHl0aG9uMyAtZXEgMSBdOyB0
+aGVuCiAgICAgcHJpbnRmICINQ2hlY2tpbmcgZm9yIHB5dGhvbjMgcHl0ZXN0ICg+PSAzLjApLi4u
+ICIKICAgICBjb25mPSQobWt0ZW1wKQogICAgIHByaW50ZiAiW3B5dGVzdF1cbm1pbnZlcnNpb249
+My4wXG4iID4gJGNvbmYKLSAgICBpZiBweXRlc3QtMyAtYyAkY29uZiAtLXZlcnNpb24gPi9kZXYv
+bnVsbCAyPiYxOyB0aGVuCisgICAgaWYgIiRweXRob24iIC1tIHB5dGVzdCAtYyAkY29uZiAtLXZl
+cnNpb24gPi9kZXYvbnVsbCAyPiYxOyB0aGVuCiAgICAgICAgIHByaW50ZiAiWWVzLlxuIgogICAg
+ICAgICBoYXZlX3B5dGhvbjNfcHl0ZXN0PTEKICAgICBlbHNlCi0tIAoyLjI4LjAKX19fX19fX19f
+X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KZXhhbXBsZSBtYWlsaW5nIGxp
+c3QgLS0gbGlzdEBleGFtcGxlLm9yZwpUbyB1bnN1YnNjcmliZSBzZW5kIGFuIGVtYWlsIHRvIGxp
+c3QtbGVhdmVAZXhhbXBsZS5vcmcK
+
+From nobody Mon Sep 17 00:00:00 2001
+From: A U Thor <mail@example.com>
+To: list@example.org
+Subject: [PATCH v2] sample
+Date: Mon,  3 Aug 2020 22:40:55 +0700
+Message-ID: <msg-id2@example.com>
+Content-Type: text/plain; charset="utf-8"
+Content-Transfer-Encoding: base64
+
+T24gZGlmZmVyZW50IGRpc3RybywgDXB5dGVzdCBpcyBzdWZmaXhlZCB3aXRoIGRpZmZlcmVudCBw
+YXR0ZXJucy4NCg0KLS0tDQogY29uZmlndXJlIHwgMiArLQ0KIDEgZmlsZSBjaGFuZ2VkLCAxIGlu
+c2VydGlvbigrKSwgMSBkZWxldGlvbigtKQ0KDQpkaWZmIC0tZ2l0IGEvY29uZmlndXJlIGIvY29u
+ZmlndXJlDQppbmRleCBkYjM1MzhiMy4uZjdjMWMwOTUgMTAwNzU1DQotLS0gYS9jb25maWd1cmUN
+CisrKyBiL2NvbmZpZ3VyZQ0KQEAgLTgxNCw3ICs4MTQsNyBAQCBpZiBbICRoYXZlX3B5dGhvbjMg
+LWVxIDEgXTsgdGhlbg0KICAgICBwcmludGYgIg1DaGVja2luZyBmb3IgcHl0aG9uMyBweXRlc3Qg
+KD49IDMuMCkuLi4gIg0KICAgICBjb25mPSQobWt0ZW1wKQ0KICAgICBwcmludGYgIltweXRlc3Rd
+XG5taW52ZXJzaW9uPTMuMFxuIiA+ICRjb25mDQotICAgIGlmIHB5dGVzdC0zIC1jICRjb25mIC0t
+dmVyc2lvbiA+L2Rldi9udWxsIDI+JjE7IHRoZW4NCisgICAgaWYgIiRweXRob24iIC1tIHB5dGVz
+dCAtYyAkY29uZiAtLXZlcnNpb24gPi9kZXYvbnVsbCAyPiYxOyB0aGVuDQogICAgICAgICBwcmlu
+dGYgIlllcy5cbiINCiAgICAgICAgIGhhdmVfcHl0aG9uM19weXRlc3Q9MQ0KICAgICBlbHNlDQot
+LSANCjIuMjguMA0KX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f
+X18KZXhhbXBsZSBtYWlsaW5nIGxpc3QgLS0gbGlzdEBleGFtcGxlLm9yZwpUbyB1bnN1YnNjcmli
+ZSBzZW5kIGFuIGVtYWlsIHRvIGxpc3QtbGVhdmVAZXhhbXBsZS5vcmcK
diff --git a/t/t5100/sample.mbox b/t/t5100/sample.mbox
index 6d4d0e4..4a54ee5 100644
--- a/t/t5100/sample.mbox
+++ b/t/t5100/sample.mbox
@@ -35,7 +35,7 @@ message:
 
 From: Nit Picker <nit.picker@example.net>
 Subject: foo is too old
-Message-Id: <nitpicker.12121212@example.net>
+Message-ID: <nitpicker.12121212@example.net>
 
 Hopefully this would fix the problem stated there.
 
@@ -78,7 +78,7 @@ message:
 
 From: Nit Picker <nit.picker@example.net>
 Subject: foo is too old
-Message-Id: <nitpicker.12121212@example.net>
+Message-ID: <nitpicker.12121212@example.net>
 
 Hopefully this would fix the problem stated there.
 
@@ -508,7 +508,7 @@ From bda@mnsspb.ru Wed Nov 12 17:54:41 2008
 From: Dmitriy Blinov <bda@mnsspb.ru>
 To: navy-patches@dinar.mns.mnsspb.ru
 Date: Wed, 12 Nov 2008 17:54:41 +0300
-Message-Id: <1226501681-24923-1-git-send-email-bda@mnsspb.ru>
+Message-ID: <1226501681-24923-1-git-send-email-bda@mnsspb.ru>
 X-Mailer: git-send-email 1.5.6.5
 MIME-Version: 1.0
 Content-Type: text/plain;
diff --git a/t/t5150-request-pull.sh b/t/t5150-request-pull.sh
index c1811ea..cb67bac 100755
--- a/t/t5150-request-pull.sh
+++ b/t/t5150-request-pull.sh
@@ -2,6 +2,9 @@
 
 test_description='Test workflows involving pull request.'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 if ! test_have_prereq PERL
@@ -31,13 +34,13 @@ test_expect_success 'setup' '
 		test_tick &&
 		git commit -m "\"Thirty days\", a reminder of month lengths" &&
 		git tag -m "version 1" -a initial &&
-		git push --tags origin master
+		git push --tags origin main
 	) &&
 	(
 		cd local &&
 		git remote add upstream "$trash_url/upstream.git" &&
 		git fetch upstream &&
-		git pull upstream master &&
+		git pull upstream main &&
 		cat <<-\EOT >>mnemonic.txt &&
 		Of twyecescore-eightt is but eine,
 		And all the remnante be thrycescore-eine.
@@ -59,7 +62,7 @@ test_expect_success 'setup' '
 		git commit -a -m "Adapt to use modern, simpler English
 
 But keep the old version, too, in case some people prefer it." &&
-		git checkout master
+		git checkout main
 	)
 
 '
@@ -129,7 +132,7 @@ test_expect_success 'pull request when forgot to push' '
 	(
 		cd local &&
 		git checkout initial &&
-		git merge --ff-only master &&
+		git merge --ff-only main &&
 		test_must_fail git request-pull initial "$downstream_url" \
 			2>../err
 	) &&
@@ -145,9 +148,9 @@ test_expect_success 'pull request after push' '
 	(
 		cd local &&
 		git checkout initial &&
-		git merge --ff-only master &&
-		git push origin master:for-upstream &&
-		git request-pull initial origin master:for-upstream >../request
+		git merge --ff-only main &&
+		git push origin main:for-upstream &&
+		git request-pull initial origin main:for-upstream >../request
 	) &&
 	sed -nf read-request.sed <request >digest &&
 	{
@@ -172,9 +175,9 @@ test_expect_success 'request asks HEAD to be pulled' '
 	(
 		cd local &&
 		git checkout initial &&
-		git merge --ff-only master &&
-		git push --tags origin master simplify &&
-		git push origin master:for-upstream &&
+		git merge --ff-only main &&
+		git push --tags origin main simplify &&
+		git push origin main:for-upstream &&
 		git request-pull initial "$downstream_url" >../request
 	) &&
 	sed -nf read-request.sed <request >digest &&
@@ -215,19 +218,19 @@ test_expect_success 'pull request format' '
 	(
 		cd local &&
 		git checkout initial &&
-		git merge --ff-only master &&
+		git merge --ff-only main &&
 		git push origin tags/full &&
 		git request-pull initial "$downstream_url" tags/full >../request
 	) &&
 	<request sed -nf fuzz.sed >request.fuzzy &&
-	test_i18ncmp expect request.fuzzy &&
+	test_cmp expect request.fuzzy &&
 
 	(
 		cd local &&
 		git request-pull initial "$downstream_url" tags/full:refs/tags/full
 	) >request &&
 	sed -nf fuzz.sed <request >request.fuzzy &&
-	test_i18ncmp expect request.fuzzy &&
+	test_cmp expect request.fuzzy &&
 
 	(
 		cd local &&
@@ -243,9 +246,9 @@ test_expect_success 'request-pull ignores OPTIONS_KEEPDASHDASH poison' '
 		OPTIONS_KEEPDASHDASH=Yes &&
 		export OPTIONS_KEEPDASHDASH &&
 		git checkout initial &&
-		git merge --ff-only master &&
-		git push origin master:for-upstream &&
-		git request-pull -- initial "$downstream_url" master:for-upstream >../request
+		git merge --ff-only main &&
+		git push origin main:for-upstream &&
+		git request-pull -- initial "$downstream_url" main:for-upstream >../request
 	)
 
 '
@@ -257,7 +260,7 @@ test_expect_success 'request-pull quotes regex metacharacters properly' '
 	(
 		cd local &&
 		git checkout initial &&
-		git merge --ff-only master &&
+		git merge --ff-only main &&
 		git tag -mrelease v2.0 &&
 		git push origin refs/tags/v2.0:refs/tags/v2-0 &&
 		test_must_fail git request-pull initial "$downstream_url" tags/v2.0 \
@@ -275,7 +278,7 @@ test_expect_success 'pull request with mismatched object' '
 	(
 		cd local &&
 		git checkout initial &&
-		git merge --ff-only master &&
+		git merge --ff-only main &&
 		git push origin HEAD:refs/tags/full &&
 		test_must_fail git request-pull initial "$downstream_url" tags/full \
 			2>../err
@@ -292,7 +295,7 @@ test_expect_success 'pull request with stale object' '
 	(
 		cd local &&
 		git checkout initial &&
-		git merge --ff-only master &&
+		git merge --ff-only main &&
 		git push origin refs/tags/full &&
 		git tag -f -m"Thirty-one days" full &&
 		test_must_fail git request-pull initial "$downstream_url" tags/full \
diff --git a/t/t5200-update-server-info.sh b/t/t5200-update-server-info.sh
index 21a58ee..ed9dfd6 100755
--- a/t/t5200-update-server-info.sh
+++ b/t/t5200-update-server-info.sh
@@ -2,6 +2,7 @@
 
 test_description='Test git update-server-info'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' 'test_commit file'
diff --git a/t/t5300-pack-object.sh b/t/t5300-pack-object.sh
index 3d6a933..61e2be2 100755
--- a/t/t5300-pack-object.sh
+++ b/t/t5300-pack-object.sh
@@ -8,125 +8,208 @@ test_description='git pack-object
 '
 . ./test-lib.sh
 
-TRASH=$(pwd)
-
-test_expect_success \
-    'setup' \
-    'rm -f .git/index* &&
-     perl -e "print \"a\" x 4096;" > a &&
-     perl -e "print \"b\" x 4096;" > b &&
-     perl -e "print \"c\" x 4096;" > c &&
-     test-tool genrandom "seed a" 2097152 > a_big &&
-     test-tool genrandom "seed b" 2097152 > b_big &&
-     git update-index --add a a_big b b_big c &&
-     cat c >d && echo foo >>d && git update-index --add d &&
-     tree=$(git write-tree) &&
-     commit=$(git commit-tree $tree </dev/null) && {
-	 echo $tree &&
-	 echo $commit &&
-	 git ls-tree $tree | sed -e "s/.* \\([0-9a-f]*\\)	.*/\\1/"
-     } >obj-list && {
-	 git diff-tree --root -p $commit &&
-	 while read object
-	 do
-	    t=$(git cat-file -t $object) &&
-	    git cat-file $t $object || return 1
-	 done <obj-list
-     } >expect'
-
-test_expect_success \
-    'pack without delta' \
-    'packname_1=$(git pack-objects --window=0 test-1 <obj-list)'
-
-test_expect_success \
-    'pack-objects with bogus arguments' \
-    'test_must_fail git pack-objects --window=0 test-1 blah blah <obj-list'
-
-rm -fr .git2
-mkdir .git2
-
-test_expect_success \
-    'unpack without delta' \
-    "GIT_OBJECT_DIRECTORY=.git2/objects &&
-     export GIT_OBJECT_DIRECTORY &&
-     git init &&
-     git unpack-objects -n <test-1-${packname_1}.pack &&
-     git unpack-objects <test-1-${packname_1}.pack"
-
-unset GIT_OBJECT_DIRECTORY
-cd "$TRASH/.git2"
-
-test_expect_success \
-    'check unpack without delta' \
-    '(cd ../.git && find objects -type f -print) |
-     while read path
-     do
-         cmp $path ../.git/$path || {
-	     echo $path differs.
-	     return 1
-	 }
-     done'
-cd "$TRASH"
-
-test_expect_success \
-    'pack with REF_DELTA' \
-    'pwd &&
-     packname_2=$(git pack-objects test-2 <obj-list)'
-
-rm -fr .git2
-mkdir .git2
-
-test_expect_success \
-    'unpack with REF_DELTA' \
-    'GIT_OBJECT_DIRECTORY=.git2/objects &&
-     export GIT_OBJECT_DIRECTORY &&
-     git init &&
-     git unpack-objects -n <test-2-${packname_2}.pack &&
-     git unpack-objects <test-2-${packname_2}.pack'
-
-unset GIT_OBJECT_DIRECTORY
-cd "$TRASH/.git2"
-test_expect_success \
-    'check unpack with REF_DELTA' \
-    '(cd ../.git && find objects -type f -print) |
-     while read path
-     do
-         cmp $path ../.git/$path || {
-	     echo $path differs.
-	     return 1
-	 }
-     done'
-cd "$TRASH"
-
-test_expect_success \
-    'pack with OFS_DELTA' \
-    'pwd &&
-     packname_3=$(git pack-objects --delta-base-offset test-3 <obj-list)'
-
-rm -fr .git2
-mkdir .git2
-
-test_expect_success \
-    'unpack with OFS_DELTA' \
-    'GIT_OBJECT_DIRECTORY=.git2/objects &&
-     export GIT_OBJECT_DIRECTORY &&
-     git init &&
-     git unpack-objects -n <test-3-${packname_3}.pack &&
-     git unpack-objects <test-3-${packname_3}.pack'
-
-unset GIT_OBJECT_DIRECTORY
-cd "$TRASH/.git2"
-test_expect_success \
-    'check unpack with OFS_DELTA' \
-    '(cd ../.git && find objects -type f -print) |
-     while read path
-     do
-         cmp $path ../.git/$path || {
-	     echo $path differs.
-	     return 1
-	 }
-     done'
-cd "$TRASH"
+test_expect_success 'setup' '
+	rm -f .git/index* &&
+	perl -e "print \"a\" x 4096;" >a &&
+	perl -e "print \"b\" x 4096;" >b &&
+	perl -e "print \"c\" x 4096;" >c &&
+	test-tool genrandom "seed a" 2097152 >a_big &&
+	test-tool genrandom "seed b" 2097152 >b_big &&
+	git update-index --add a a_big b b_big c &&
+	cat c >d && echo foo >>d && git update-index --add d &&
+	tree=$(git write-tree) &&
+	commit=$(git commit-tree $tree </dev/null) &&
+	{
+		echo $tree &&
+		echo $commit &&
+		git ls-tree $tree | sed -e "s/.* \\([0-9a-f]*\\)	.*/\\1/"
+	} >obj-list &&
+	{
+		git diff-tree --root -p $commit &&
+		while read object
+		do
+			t=$(git cat-file -t $object) &&
+			git cat-file $t $object || return 1
+		done <obj-list
+	} >expect
+'
+
+test_expect_success 'setup pack-object <stdin' '
+	git init pack-object-stdin &&
+	test_commit -C pack-object-stdin one &&
+	test_commit -C pack-object-stdin two
+
+'
+
+test_expect_success 'pack-object <stdin parsing: basic [|--revs]' '
+	cat >in <<-EOF &&
+	$(git -C pack-object-stdin rev-parse one)
+	EOF
+
+	git -C pack-object-stdin pack-objects basic-stdin <in &&
+	idx=$(echo pack-object-stdin/basic-stdin-*.idx) &&
+	git show-index <"$idx" >actual &&
+	test_line_count = 1 actual &&
+
+	git -C pack-object-stdin pack-objects --revs basic-stdin-revs <in &&
+	idx=$(echo pack-object-stdin/basic-stdin-revs-*.idx) &&
+	git show-index <"$idx" >actual &&
+	test_line_count = 3 actual
+'
+
+test_expect_success 'pack-object <stdin parsing: [|--revs] bad line' '
+	cat >in <<-EOF &&
+	$(git -C pack-object-stdin rev-parse one)
+	garbage
+	$(git -C pack-object-stdin rev-parse two)
+	EOF
+
+	sed "s/^> //g" >err.expect <<-EOF &&
+	fatal: expected object ID, got garbage:
+	>  garbage
+
+	EOF
+	test_must_fail git -C pack-object-stdin pack-objects bad-line-stdin <in 2>err.actual &&
+	test_cmp err.expect err.actual &&
+
+	cat >err.expect <<-EOF &&
+	fatal: bad revision '"'"'garbage'"'"'
+	EOF
+	test_must_fail git -C pack-object-stdin pack-objects --revs bad-line-stdin-revs <in 2>err.actual &&
+	test_cmp err.expect err.actual
+'
+
+test_expect_success 'pack-object <stdin parsing: [|--revs] empty line' '
+	cat >in <<-EOF &&
+	$(git -C pack-object-stdin rev-parse one)
+
+	$(git -C pack-object-stdin rev-parse two)
+	EOF
+
+	sed -e "s/^> //g" -e "s/Z$//g" >err.expect <<-EOF &&
+	fatal: expected object ID, got garbage:
+	>  Z
+
+	EOF
+	test_must_fail git -C pack-object-stdin pack-objects empty-line-stdin <in 2>err.actual &&
+	test_cmp err.expect err.actual &&
+
+	git -C pack-object-stdin pack-objects --revs empty-line-stdin-revs <in &&
+	idx=$(echo pack-object-stdin/empty-line-stdin-revs-*.idx) &&
+	git show-index <"$idx" >actual &&
+	test_line_count = 3 actual
+'
+
+test_expect_success 'pack-object <stdin parsing: [|--revs] with --stdin' '
+	cat >in <<-EOF &&
+	$(git -C pack-object-stdin rev-parse one)
+	$(git -C pack-object-stdin rev-parse two)
+	EOF
+
+	# There is the "--stdin-packs is incompatible with --revs"
+	# test below, but we should make sure that the revision.c
+	# --stdin is not picked up
+	cat >err.expect <<-EOF &&
+	fatal: disallowed abbreviated or ambiguous option '"'"'stdin'"'"'
+	EOF
+	test_must_fail git -C pack-object-stdin pack-objects stdin-with-stdin-option --stdin <in 2>err.actual &&
+	test_cmp err.expect err.actual &&
+
+	test_must_fail git -C pack-object-stdin pack-objects --stdin --revs stdin-with-stdin-option-revs 2>err.actual <in &&
+	test_cmp err.expect err.actual
+'
+
+test_expect_success 'pack-object <stdin parsing: --stdin-packs handles garbage' '
+	cat >in <<-EOF &&
+	$(git -C pack-object-stdin rev-parse one)
+	$(git -C pack-object-stdin rev-parse two)
+	EOF
+
+	# That we get "two" and not "one" has to do with OID
+	# ordering. It happens to be the same here under SHA-1 and
+	# SHA-256. See commentary in pack-objects.c
+	cat >err.expect <<-EOF &&
+	fatal: could not find pack '"'"'$(git -C pack-object-stdin rev-parse two)'"'"'
+	EOF
+	test_must_fail git \
+		-C pack-object-stdin \
+		pack-objects stdin-with-stdin-option --stdin-packs \
+		<in 2>err.actual &&
+	test_cmp err.expect err.actual
+'
+
+# usage: check_deltas <stderr_from_pack_objects> <cmp_op> <nr_deltas>
+# e.g.: check_deltas stderr -gt 0
+check_deltas() {
+	deltas=$(perl -lne '/delta (\d+)/ and print $1' "$1") &&
+	shift &&
+	if ! test "$deltas" "$@"
+	then
+		echo >&2 "unexpected number of deltas (compared $delta $*)"
+		return 1
+	fi
+}
+
+test_expect_success 'pack without delta' '
+	packname_1=$(git pack-objects --progress --window=0 test-1 \
+			<obj-list 2>stderr) &&
+	check_deltas stderr = 0
+'
+
+test_expect_success 'pack-objects with bogus arguments' '
+	test_must_fail git pack-objects --window=0 test-1 blah blah <obj-list
+'
+
+check_unpack () {
+	local packname="$1" &&
+	local object_list="$2" &&
+	local git_config="$3" &&
+	test_when_finished "rm -rf git2" &&
+	git $git_config init --bare git2 &&
+	(
+		git $git_config -C git2 unpack-objects -n <"$packname".pack &&
+		git $git_config -C git2 unpack-objects <"$packname".pack &&
+		git $git_config -C git2 cat-file --batch-check="%(objectname)"
+	) <"$object_list" >current &&
+	cmp "$object_list" current
+}
+
+test_expect_success 'unpack without delta' '
+	check_unpack test-1-${packname_1} obj-list
+'
+
+BATCH_CONFIGURATION='-c core.fsync=loose-object -c core.fsyncmethod=batch'
+
+test_expect_success 'unpack without delta (core.fsyncmethod=batch)' '
+	check_unpack test-1-${packname_1} obj-list "$BATCH_CONFIGURATION"
+'
+
+test_expect_success 'pack with REF_DELTA' '
+	packname_2=$(git pack-objects --progress test-2 <obj-list 2>stderr) &&
+	check_deltas stderr -gt 0
+'
+
+test_expect_success 'unpack with REF_DELTA' '
+	check_unpack test-2-${packname_2} obj-list
+'
+
+test_expect_success 'unpack with REF_DELTA (core.fsyncmethod=batch)' '
+       check_unpack test-2-${packname_2} obj-list "$BATCH_CONFIGURATION"
+'
+
+test_expect_success 'pack with OFS_DELTA' '
+	packname_3=$(git pack-objects --progress --delta-base-offset test-3 \
+			<obj-list 2>stderr) &&
+	check_deltas stderr -gt 0
+'
+
+test_expect_success 'unpack with OFS_DELTA' '
+	check_unpack test-3-${packname_3} obj-list
+'
+
+test_expect_success 'unpack with OFS_DELTA (core.fsyncmethod=batch)' '
+	check_unpack test-3-${packname_3} obj-list "$BATCH_CONFIGURATION"
+'
 
 test_expect_success 'compare delta flavors' '
 	perl -e '\''
@@ -135,55 +218,33 @@ test_expect_success 'compare delta flavors' '
 	'\'' test-2-$packname_2.pack test-3-$packname_3.pack
 '
 
-rm -fr .git2
-mkdir .git2
-
-test_expect_success \
-    'use packed objects' \
-    'GIT_OBJECT_DIRECTORY=.git2/objects &&
-     export GIT_OBJECT_DIRECTORY &&
-     git init &&
-     cp test-1-${packname_1}.pack test-1-${packname_1}.idx .git2/objects/pack && {
-	 git diff-tree --root -p $commit &&
-	 while read object
-	 do
-	    t=$(git cat-file -t $object) &&
-	    git cat-file $t $object || return 1
-	 done <obj-list
-    } >current &&
-    cmp expect current'
-
-test_expect_success \
-    'use packed deltified (REF_DELTA) objects' \
-    'GIT_OBJECT_DIRECTORY=.git2/objects &&
-     export GIT_OBJECT_DIRECTORY &&
-     rm -f .git2/objects/pack/test-* &&
-     cp test-2-${packname_2}.pack test-2-${packname_2}.idx .git2/objects/pack && {
-	 git diff-tree --root -p $commit &&
-	 while read object
-	 do
-	    t=$(git cat-file -t $object) &&
-	    git cat-file $t $object || return 1
-	 done <obj-list
-    } >current &&
-    cmp expect current'
-
-test_expect_success \
-    'use packed deltified (OFS_DELTA) objects' \
-    'GIT_OBJECT_DIRECTORY=.git2/objects &&
-     export GIT_OBJECT_DIRECTORY &&
-     rm -f .git2/objects/pack/test-* &&
-     cp test-3-${packname_3}.pack test-3-${packname_3}.idx .git2/objects/pack && {
-	 git diff-tree --root -p $commit &&
-	 while read object
-	 do
-	    t=$(git cat-file -t $object) &&
-	    git cat-file $t $object || return 1
-	 done <obj-list
-    } >current &&
-    cmp expect current'
-
-unset GIT_OBJECT_DIRECTORY
+check_use_objects () {
+	test_when_finished "rm -rf git2" &&
+	git init --bare git2 &&
+	cp "$1".pack "$1".idx git2/objects/pack &&
+	(
+		cd git2 &&
+		git diff-tree --root -p $commit &&
+		while read object
+		do
+			t=$(git cat-file -t $object) &&
+			git cat-file $t $object || exit 1
+		done
+	) <obj-list >current &&
+	cmp expect current
+}
+
+test_expect_success 'use packed objects' '
+	check_use_objects test-1-${packname_1}
+'
+
+test_expect_success 'use packed deltified (REF_DELTA) objects' '
+	check_use_objects test-2-${packname_2}
+'
+
+test_expect_success 'use packed deltified (OFS_DELTA) objects' '
+	check_use_objects test-3-${packname_3}
+'
 
 test_expect_success 'survive missing objects/pack directory' '
 	(
@@ -202,95 +263,97 @@ test_expect_success 'survive missing objects/pack directory' '
 	)
 '
 
-test_expect_success \
-    'verify pack' \
-    'git verify-pack	test-1-${packname_1}.idx \
-			test-2-${packname_2}.idx \
-			test-3-${packname_3}.idx'
-
-test_expect_success \
-    'verify pack -v' \
-    'git verify-pack -v	test-1-${packname_1}.idx \
-			test-2-${packname_2}.idx \
-			test-3-${packname_3}.idx'
-
-test_expect_success \
-    'verify-pack catches mismatched .idx and .pack files' \
-    'cat test-1-${packname_1}.idx >test-3.idx &&
-     cat test-2-${packname_2}.pack >test-3.pack &&
-     if git verify-pack test-3.idx
-     then false
-     else :;
-     fi'
-
-test_expect_success \
-    'verify-pack catches a corrupted pack signature' \
-    'cat test-1-${packname_1}.pack >test-3.pack &&
-     echo | dd of=test-3.pack count=1 bs=1 conv=notrunc seek=2 &&
-     if git verify-pack test-3.idx
-     then false
-     else :;
-     fi'
-
-test_expect_success \
-    'verify-pack catches a corrupted pack version' \
-    'cat test-1-${packname_1}.pack >test-3.pack &&
-     echo | dd of=test-3.pack count=1 bs=1 conv=notrunc seek=7 &&
-     if git verify-pack test-3.idx
-     then false
-     else :;
-     fi'
-
-test_expect_success \
-    'verify-pack catches a corrupted type/size of the 1st packed object data' \
-    'cat test-1-${packname_1}.pack >test-3.pack &&
-     echo | dd of=test-3.pack count=1 bs=1 conv=notrunc seek=12 &&
-     if git verify-pack test-3.idx
-     then false
-     else :;
-     fi'
-
-test_expect_success \
-    'verify-pack catches a corrupted sum of the index file itself' \
-    'l=$(wc -c <test-3.idx) &&
-     l=$(expr $l - 20) &&
-     cat test-1-${packname_1}.pack >test-3.pack &&
-     printf "%20s" "" | dd of=test-3.idx count=20 bs=1 conv=notrunc seek=$l &&
-     if git verify-pack test-3.pack
-     then false
-     else :;
-     fi'
-
-test_expect_success \
-    'build pack index for an existing pack' \
-    'cat test-1-${packname_1}.pack >test-3.pack &&
-     git index-pack -o tmp.idx test-3.pack &&
-     cmp tmp.idx test-1-${packname_1}.idx &&
-
-     git index-pack test-3.pack &&
-     cmp test-3.idx test-1-${packname_1}.idx &&
-
-     cat test-2-${packname_2}.pack >test-3.pack &&
-     git index-pack -o tmp.idx test-2-${packname_2}.pack &&
-     cmp tmp.idx test-2-${packname_2}.idx &&
-
-     git index-pack test-3.pack &&
-     cmp test-3.idx test-2-${packname_2}.idx &&
-
-     cat test-3-${packname_3}.pack >test-3.pack &&
-     git index-pack -o tmp.idx test-3-${packname_3}.pack &&
-     cmp tmp.idx test-3-${packname_3}.idx &&
-
-     git index-pack test-3.pack &&
-     cmp test-3.idx test-3-${packname_3}.idx &&
-
-     cat test-1-${packname_1}.pack >test-4.pack &&
-     rm -f test-4.keep &&
-     git index-pack --keep=why test-4.pack &&
-     cmp test-1-${packname_1}.idx test-4.idx &&
-     test -f test-4.keep &&
-
-     :'
+test_expect_success 'verify pack' '
+	git verify-pack test-1-${packname_1}.idx \
+		test-2-${packname_2}.idx \
+		test-3-${packname_3}.idx
+'
+
+test_expect_success 'verify pack -v' '
+	git verify-pack -v test-1-${packname_1}.idx \
+		test-2-${packname_2}.idx \
+		test-3-${packname_3}.idx
+'
+
+test_expect_success 'verify-pack catches mismatched .idx and .pack files' '
+	cat test-1-${packname_1}.idx >test-3.idx &&
+	cat test-2-${packname_2}.pack >test-3.pack &&
+	if git verify-pack test-3.idx
+	then false
+	else :;
+	fi
+'
+
+test_expect_success 'verify-pack catches a corrupted pack signature' '
+	cat test-1-${packname_1}.pack >test-3.pack &&
+	echo | dd of=test-3.pack count=1 bs=1 conv=notrunc seek=2 &&
+	if git verify-pack test-3.idx
+	then false
+	else :;
+	fi
+'
+
+test_expect_success 'verify-pack catches a corrupted pack version' '
+	cat test-1-${packname_1}.pack >test-3.pack &&
+	echo | dd of=test-3.pack count=1 bs=1 conv=notrunc seek=7 &&
+	if git verify-pack test-3.idx
+	then false
+	else :;
+	fi
+'
+
+test_expect_success 'verify-pack catches a corrupted type/size of the 1st packed object data' '
+	cat test-1-${packname_1}.pack >test-3.pack &&
+	echo | dd of=test-3.pack count=1 bs=1 conv=notrunc seek=12 &&
+	if git verify-pack test-3.idx
+	then false
+	else :;
+	fi
+'
+
+test_expect_success 'verify-pack catches a corrupted sum of the index file itself' '
+	l=$(wc -c <test-3.idx) &&
+	l=$(expr $l - 20) &&
+	cat test-1-${packname_1}.pack >test-3.pack &&
+	printf "%20s" "" | dd of=test-3.idx count=20 bs=1 conv=notrunc seek=$l &&
+	if git verify-pack test-3.pack
+	then false
+	else :;
+	fi
+'
+
+test_expect_success 'build pack index for an existing pack' '
+	cat test-1-${packname_1}.pack >test-3.pack &&
+	git index-pack -o tmp.idx test-3.pack &&
+	cmp tmp.idx test-1-${packname_1}.idx &&
+
+	git index-pack --promisor=message test-3.pack &&
+	cmp test-3.idx test-1-${packname_1}.idx &&
+	echo message >expect &&
+	test_cmp expect test-3.promisor &&
+
+	cat test-2-${packname_2}.pack >test-3.pack &&
+	git index-pack -o tmp.idx test-2-${packname_2}.pack &&
+	cmp tmp.idx test-2-${packname_2}.idx &&
+
+	git index-pack test-3.pack &&
+	cmp test-3.idx test-2-${packname_2}.idx &&
+
+	cat test-3-${packname_3}.pack >test-3.pack &&
+	git index-pack -o tmp.idx test-3-${packname_3}.pack &&
+	cmp tmp.idx test-3-${packname_3}.idx &&
+
+	git index-pack test-3.pack &&
+	cmp test-3.idx test-3-${packname_3}.idx &&
+
+	cat test-1-${packname_1}.pack >test-4.pack &&
+	rm -f test-4.keep &&
+	git index-pack --keep=why test-4.pack &&
+	cmp test-1-${packname_1}.idx test-4.idx &&
+	test -f test-4.keep &&
+
+	:
+'
 
 test_expect_success 'unpacking with --strict' '
 
@@ -299,7 +362,7 @@ test_expect_success 'unpacking with --strict' '
 		for i in 0 1 2 3 4 5 6 7 8 9
 		do
 			o=$(echo $j$i | git hash-object -w --stdin) &&
-			echo "100644 $o	0 $j$i"
+			echo "100644 $o	0 $j$i" || return 1
 		done
 	done >LIST &&
 	rm -f .git/index &&
@@ -313,11 +376,7 @@ test_expect_success 'unpacking with --strict' '
 	ST=$(git write-tree) &&
 	git rev-list --objects "$LIST" "$LI" "$ST" >actual &&
 	PACK5=$( git pack-objects test-5 <actual ) &&
-	PACK6=$( (
-			echo "$LIST"
-			echo "$LI"
-			echo "$ST"
-		 ) | git pack-objects test-6 ) &&
+	PACK6=$( test_write_lines "$LIST" "$LI" "$ST" | git pack-objects test-6 ) &&
 	test_create_repo test-5 &&
 	(
 		cd test-5 &&
@@ -346,7 +405,7 @@ test_expect_success 'index-pack with --strict' '
 		for i in 0 1 2 3 4 5 6 7 8 9
 		do
 			o=$(echo $j$i | git hash-object -w --stdin) &&
-			echo "100644 $o	0 $j$i"
+			echo "100644 $o	0 $j$i" || return 1
 		done
 	done >LIST &&
 	rm -f .git/index &&
@@ -360,11 +419,7 @@ test_expect_success 'index-pack with --strict' '
 	ST=$(git write-tree) &&
 	git rev-list --objects "$LIST" "$LI" "$ST" >actual &&
 	PACK5=$( git pack-objects test-5 <actual ) &&
-	PACK6=$( (
-			echo "$LIST"
-			echo "$LI"
-			echo "$ST"
-		 ) | git pack-objects test-6 ) &&
+	PACK6=$( test_write_lines "$LIST" "$LI" "$ST" | git pack-objects test-6 ) &&
 	test_create_repo test-7 &&
 	(
 		cd test-7 &&
@@ -386,6 +441,47 @@ test_expect_success 'index-pack with --strict' '
 	)
 '
 
+test_expect_success 'setup for --strict and --fsck-objects downgrading fsck msgs' '
+	git init strict &&
+	(
+		cd strict &&
+		test_commit first hello &&
+		cat >commit <<-EOF &&
+		tree $(git rev-parse HEAD^{tree})
+		parent $(git rev-parse HEAD)
+		author A U Thor
+		committer A U Thor
+
+		commit: this is a commit with bad emails
+
+		EOF
+		git hash-object --literally -t commit -w --stdin <commit >commit_list &&
+		git pack-objects test <commit_list >pack-name
+	)
+'
+
+test_with_bad_commit () {
+	must_fail_arg="$1" &&
+	must_pass_arg="$2" &&
+	(
+		cd strict &&
+		test_must_fail git index-pack "$must_fail_arg" "test-$(cat pack-name).pack" &&
+		git index-pack "$must_pass_arg" "test-$(cat pack-name).pack"
+	)
+}
+
+test_expect_success 'index-pack with --strict downgrading fsck msgs' '
+	test_with_bad_commit --strict --strict="missingEmail=ignore"
+'
+
+test_expect_success 'index-pack with --fsck-objects downgrading fsck msgs' '
+	test_with_bad_commit --fsck-objects --fsck-objects="missingEmail=ignore"
+'
+
+test_expect_success 'cleanup for --strict and --fsck-objects downgrading fsck msgs' '
+	rm -rf strict
+'
+
 test_expect_success 'honor pack.packSizeLimit' '
 	git config pack.packSizeLimit 3m &&
 	packname_10=$(git pack-objects test-10 <obj-list) &&
@@ -427,7 +523,8 @@ test_expect_success 'index-pack --strict <pack> works in non-repo' '
 	test_path_is_file foo.idx
 '
 
-test_expect_success !PTHREADS,C_LOCALE_OUTPUT 'index-pack --threads=N or pack.threads=N warns when no pthreads' '
+test_expect_success !PTHREADS,!FAIL_PREREQS \
+	'index-pack --threads=N or pack.threads=N warns when no pthreads' '
 	test_must_fail git index-pack --threads=2 2>err &&
 	grep ^warning: err >warnings &&
 	test_line_count = 1 warnings &&
@@ -445,7 +542,8 @@ test_expect_success !PTHREADS,C_LOCALE_OUTPUT 'index-pack --threads=N or pack.th
 	grep -F "no threads support, ignoring pack.threads" err
 '
 
-test_expect_success !PTHREADS,C_LOCALE_OUTPUT 'pack-objects --threads=N or pack.threads=N warns when no pthreads' '
+test_expect_success !PTHREADS,!FAIL_PREREQS \
+	'pack-objects --threads=N or pack.threads=N warns when no pthreads' '
 	git pack-objects --threads=2 --stdout --all </dev/null >/dev/null 2>err &&
 	grep ^warning: err >warnings &&
 	test_line_count = 1 warnings &&
@@ -484,7 +582,7 @@ test_expect_success 'make sure index-pack detects the SHA1 collision' '
 	(
 		cd corrupt &&
 		test_must_fail git index-pack -o ../bad.idx ../test-3.pack 2>msg &&
-		test_i18ngrep "SHA1 COLLISION FOUND" msg
+		test_grep "SHA1 COLLISION FOUND" msg
 	)
 '
 
@@ -492,7 +590,7 @@ test_expect_success 'make sure index-pack detects the SHA1 collision (large blob
 	(
 		cd corrupt &&
 		test_must_fail git -c core.bigfilethreshold=1 index-pack -o ../bad.idx ../test-3.pack 2>msg &&
-		test_i18ngrep "SHA1 COLLISION FOUND" msg
+		test_grep "SHA1 COLLISION FOUND" msg
 	)
 '
 
@@ -528,8 +626,13 @@ test_expect_success 'prefetch objects' '
 	TWO=$(git -C server rev-parse three_branch^) &&
 	git -C client fetch --filter=blob:none origin "$TWO" &&
 	GIT_TRACE_PACKET=$(pwd)/trace git -C client push origin "$TWO":refs/heads/two_branch &&
-	grep "git> done" trace >donelines &&
+	grep "fetch> done" trace >donelines &&
 	test_line_count = 1 donelines
 '
 
+test_expect_success 'negative window clamps to 0' '
+	git pack-objects --progress --window=-1 neg-window <obj-list 2>stderr &&
+	check_deltas stderr = 0
+'
+
 test_done
diff --git a/t/t5301-sliding-window.sh b/t/t5301-sliding-window.sh
index 76f9798..226490d 100755
--- a/t/t5301-sliding-window.sh
+++ b/t/t5301-sliding-window.sh
@@ -4,57 +4,59 @@
 #
 
 test_description='mmap sliding window tests'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
-test_expect_success \
-    'setup' \
-    'rm -f .git/index* &&
-     for i in a b c
-     do
-         echo $i >$i &&
-	 test-tool genrandom "$i" 32768 >>$i &&
-         git update-index --add $i || return 1
-     done &&
-     echo d >d && cat c >>d && git update-index --add d &&
-     tree=$(git write-tree) &&
-     commit1=$(git commit-tree $tree </dev/null) &&
-     git update-ref HEAD $commit1 &&
-     git repack -a -d &&
-     test "$(git count-objects)" = "0 objects, 0 kilobytes" &&
-     pack1=$(ls .git/objects/pack/*.pack) &&
-     test -f "$pack1"'
-
-test_expect_success \
-    'verify-pack -v, defaults' \
-    'git verify-pack -v "$pack1"'
-
-test_expect_success \
-    'verify-pack -v, packedGitWindowSize == 1 page' \
-    'git config core.packedGitWindowSize 512 &&
-     git verify-pack -v "$pack1"'
-
-test_expect_success \
-    'verify-pack -v, packedGit{WindowSize,Limit} == 1 page' \
-    'git config core.packedGitWindowSize 512 &&
-     git config core.packedGitLimit 512 &&
-     git verify-pack -v "$pack1"'
-
-test_expect_success \
-    'repack -a -d, packedGit{WindowSize,Limit} == 1 page' \
-    'git config core.packedGitWindowSize 512 &&
-     git config core.packedGitLimit 512 &&
-     commit2=$(git commit-tree $tree -p $commit1 </dev/null) &&
-     git update-ref HEAD $commit2 &&
-     git repack -a -d &&
-     test "$(git count-objects)" = "0 objects, 0 kilobytes" &&
-     pack2=$(ls .git/objects/pack/*.pack) &&
-     test -f "$pack2" &&
-     test "$pack1" \!= "$pack2"'
-
-test_expect_success \
-    'verify-pack -v, defaults' \
-    'git config --unset core.packedGitWindowSize &&
-     git config --unset core.packedGitLimit &&
-     git verify-pack -v "$pack2"'
+test_expect_success 'setup' '
+	rm -f .git/index* &&
+	for i in a b c
+	do
+	echo $i >$i &&
+	test-tool genrandom "$i" 32768 >>$i &&
+	git update-index --add $i || return 1
+	done &&
+	echo d >d && cat c >>d && git update-index --add d &&
+	tree=$(git write-tree) &&
+	commit1=$(git commit-tree $tree </dev/null) &&
+	git update-ref HEAD $commit1 &&
+	git repack -a -d &&
+	test "$(git count-objects)" = "0 objects, 0 kilobytes" &&
+	pack1=$(ls .git/objects/pack/*.pack) &&
+	test -f "$pack1"
+'
+
+test_expect_success 'verify-pack -v, defaults' '
+	git verify-pack -v "$pack1"
+'
+
+test_expect_success 'verify-pack -v, packedGitWindowSize == 1 page' '
+	git config core.packedGitWindowSize 512 &&
+	git verify-pack -v "$pack1"
+'
+
+test_expect_success 'verify-pack -v, packedGit{WindowSize,Limit} == 1 page' '
+	git config core.packedGitWindowSize 512 &&
+	git config core.packedGitLimit 512 &&
+	git verify-pack -v "$pack1"
+'
+
+test_expect_success 'repack -a -d, packedGit{WindowSize,Limit} == 1 page' '
+	git config core.packedGitWindowSize 512 &&
+	git config core.packedGitLimit 512 &&
+	commit2=$(git commit-tree $tree -p $commit1 </dev/null) &&
+	git update-ref HEAD $commit2 &&
+	git repack -a -d &&
+	test "$(git count-objects)" = "0 objects, 0 kilobytes" &&
+	pack2=$(ls .git/objects/pack/*.pack) &&
+	test -f "$pack2" &&
+	test "$pack1" \!= "$pack2"
+'
+
+test_expect_success 'verify-pack -v, defaults' '
+	git config --unset core.packedGitWindowSize &&
+	git config --unset core.packedGitLimit &&
+	git verify-pack -v "$pack2"
+'
 
 test_done
diff --git a/t/t5302-pack-index.sh b/t/t5302-pack-index.sh
index c92e553..d88e6f1 100755
--- a/t/t5302-pack-index.sh
+++ b/t/t5302-pack-index.sh
@@ -4,6 +4,8 @@
 #
 
 test_description='pack index with 64-bit offsets and object CRC'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -14,7 +16,7 @@ test_expect_success 'setup' '
 	i=1 &&
 	while test $i -le 100
 	do
-		iii=$(printf "%03i" $i)
+		iii=$(printf "%03i" $i) &&
 		test-tool genrandom "bar" 200 > wide_delta_$iii &&
 		test-tool genrandom "baz $iii" 50 >> wide_delta_$iii &&
 		test-tool genrandom "foo"$i 100 > deep_delta_$iii &&
@@ -263,7 +265,7 @@ tag guten tag
 This is an invalid tag.
 EOF
 
-	tag=$(git hash-object -t tag -w --stdin <wrong-tag) &&
+	tag=$(git hash-object -t tag -w --stdin --literally <wrong-tag) &&
 	pack1=$(echo $tag $sha | git pack-objects tag-test) &&
 	echo remove tag object &&
 	thirtyeight=${tag#??} &&
@@ -277,4 +279,19 @@ test_expect_success 'index-pack --fsck-objects also warns upon missing tagger in
 	grep "^warning:.* expected .tagger. line" err
 '
 
+test_expect_success 'index-pack -v --stdin produces progress for both phases' '
+	pack=$(git pack-objects --all pack </dev/null) &&
+	GIT_PROGRESS_DELAY=0 git index-pack -v --stdin <pack-$pack.pack 2>err &&
+	test_grep "Receiving objects" err &&
+	test_grep "Resolving deltas" err
+'
+
+test_expect_success 'too-large packs report the breach' '
+	pack=$(git pack-objects --all pack </dev/null) &&
+	sz="$(test_file_size pack-$pack.pack)" &&
+	test "$sz" -gt 20 &&
+	test_must_fail git index-pack --max-input-size=20 pack-$pack.pack 2>err &&
+	grep "maximum allowed size (20 bytes)" err
+'
+
 test_done
diff --git a/t/t5303-pack-corruption-resilience.sh b/t/t5303-pack-corruption-resilience.sh
index 41e6dc4..61469ef 100755
--- a/t/t5303-pack-corruption-resilience.sh
+++ b/t/t5303-pack-corruption-resilience.sh
@@ -4,6 +4,8 @@
 #
 
 test_description='resilience to pack corruptions with redundant objects'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # Note: the test objects are created with knowledge of their pack encoding
@@ -57,304 +59,304 @@ do_corrupt_object() {
 
 printf '\0' > zero
 
-test_expect_success \
-    'initial setup validation' \
-    'create_test_files &&
-     create_new_pack &&
-     git prune-packed &&
-     git cat-file blob $blob_1 > /dev/null &&
-     git cat-file blob $blob_2 > /dev/null &&
-     git cat-file blob $blob_3 > /dev/null'
-
-test_expect_success \
-    'create corruption in header of first object' \
-    'do_corrupt_object $blob_1 0 < zero &&
-     test_must_fail git cat-file blob $blob_1 > /dev/null &&
-     test_must_fail git cat-file blob $blob_2 > /dev/null &&
-     test_must_fail git cat-file blob $blob_3 > /dev/null'
-
-test_expect_success \
-    '... but having a loose copy allows for full recovery' \
-    'mv ${pack}.idx tmp &&
-     git hash-object -t blob -w file_1 &&
-     mv tmp ${pack}.idx &&
-     git cat-file blob $blob_1 > /dev/null &&
-     git cat-file blob $blob_2 > /dev/null &&
-     git cat-file blob $blob_3 > /dev/null'
-
-test_expect_success \
-    '... and loose copy of first delta allows for partial recovery' \
-    'git prune-packed &&
-     test_must_fail git cat-file blob $blob_2 > /dev/null &&
-     mv ${pack}.idx tmp &&
-     git hash-object -t blob -w file_2 &&
-     mv tmp ${pack}.idx &&
-     test_must_fail git cat-file blob $blob_1 > /dev/null &&
-     git cat-file blob $blob_2 > /dev/null &&
-     git cat-file blob $blob_3 > /dev/null'
-
-test_expect_success \
-    'create corruption in data of first object' \
-    'create_new_pack &&
-     git prune-packed &&
-     chmod +w ${pack}.pack &&
-     perl -i.bak -pe "s/ base /abcdef/" ${pack}.pack &&
-     test_must_fail git cat-file blob $blob_1 > /dev/null &&
-     test_must_fail git cat-file blob $blob_2 > /dev/null &&
-     test_must_fail git cat-file blob $blob_3 > /dev/null'
-
-test_expect_success \
-    '... but having a loose copy allows for full recovery' \
-    'mv ${pack}.idx tmp &&
-     git hash-object -t blob -w file_1 &&
-     mv tmp ${pack}.idx &&
-     git cat-file blob $blob_1 > /dev/null &&
-     git cat-file blob $blob_2 > /dev/null &&
-     git cat-file blob $blob_3 > /dev/null'
-
-test_expect_success \
-    '... and loose copy of second object allows for partial recovery' \
-    'git prune-packed &&
-     test_must_fail git cat-file blob $blob_2 > /dev/null &&
-     mv ${pack}.idx tmp &&
-     git hash-object -t blob -w file_2 &&
-     mv tmp ${pack}.idx &&
-     test_must_fail git cat-file blob $blob_1 > /dev/null &&
-     git cat-file blob $blob_2 > /dev/null &&
-     git cat-file blob $blob_3 > /dev/null'
-
-test_expect_success \
-    'create corruption in header of first delta' \
-    'create_new_pack &&
-     git prune-packed &&
-     do_corrupt_object $blob_2 0 < zero &&
-     git cat-file blob $blob_1 > /dev/null &&
-     test_must_fail git cat-file blob $blob_2 > /dev/null &&
-     test_must_fail git cat-file blob $blob_3 > /dev/null'
-
-test_expect_success \
-    '... but having a loose copy allows for full recovery' \
-    'mv ${pack}.idx tmp &&
-     git hash-object -t blob -w file_2 &&
-     mv tmp ${pack}.idx &&
-     git cat-file blob $blob_1 > /dev/null &&
-     git cat-file blob $blob_2 > /dev/null &&
-     git cat-file blob $blob_3 > /dev/null'
-
-test_expect_success \
-    '... and then a repack "clears" the corruption' \
-    'do_repack &&
-     git prune-packed &&
-     git verify-pack ${pack}.pack &&
-     git cat-file blob $blob_1 > /dev/null &&
-     git cat-file blob $blob_2 > /dev/null &&
-     git cat-file blob $blob_3 > /dev/null'
-
-test_expect_success \
-    'create corruption in data of first delta' \
-    'create_new_pack &&
-     git prune-packed &&
-     chmod +w ${pack}.pack &&
-     perl -i.bak -pe "s/ delta1 /abcdefgh/" ${pack}.pack &&
-     git cat-file blob $blob_1 > /dev/null &&
-     test_must_fail git cat-file blob $blob_2 > /dev/null &&
-     test_must_fail git cat-file blob $blob_3 > /dev/null'
-
-test_expect_success \
-    '... but having a loose copy allows for full recovery' \
-    'mv ${pack}.idx tmp &&
-     git hash-object -t blob -w file_2 &&
-     mv tmp ${pack}.idx &&
-     git cat-file blob $blob_1 > /dev/null &&
-     git cat-file blob $blob_2 > /dev/null &&
-     git cat-file blob $blob_3 > /dev/null'
-
-test_expect_success \
-    '... and then a repack "clears" the corruption' \
-    'do_repack &&
-     git prune-packed &&
-     git verify-pack ${pack}.pack &&
-     git cat-file blob $blob_1 > /dev/null &&
-     git cat-file blob $blob_2 > /dev/null &&
-     git cat-file blob $blob_3 > /dev/null'
-
-test_expect_success \
-    'corruption in delta base reference of first delta (OBJ_REF_DELTA)' \
-    'create_new_pack &&
-     git prune-packed &&
-     do_corrupt_object $blob_2 2 < zero &&
-     git cat-file blob $blob_1 > /dev/null &&
-     test_must_fail git cat-file blob $blob_2 > /dev/null &&
-     test_must_fail git cat-file blob $blob_3 > /dev/null'
-
-test_expect_success \
-    '... but having a loose copy allows for full recovery' \
-    'mv ${pack}.idx tmp &&
-     git hash-object -t blob -w file_2 &&
-     mv tmp ${pack}.idx &&
-     git cat-file blob $blob_1 > /dev/null &&
-     git cat-file blob $blob_2 > /dev/null &&
-     git cat-file blob $blob_3 > /dev/null'
-
-test_expect_success \
-    '... and then a repack "clears" the corruption' \
-    'do_repack &&
-     git prune-packed &&
-     git verify-pack ${pack}.pack &&
-     git cat-file blob $blob_1 > /dev/null &&
-     git cat-file blob $blob_2 > /dev/null &&
-     git cat-file blob $blob_3 > /dev/null'
-
-test_expect_success \
-    'corruption #0 in delta base reference of first delta (OBJ_OFS_DELTA)' \
-    'create_new_pack --delta-base-offset &&
-     git prune-packed &&
-     do_corrupt_object $blob_2 2 < zero &&
-     git cat-file blob $blob_1 > /dev/null &&
-     test_must_fail git cat-file blob $blob_2 > /dev/null &&
-     test_must_fail git cat-file blob $blob_3 > /dev/null'
-
-test_expect_success \
-    '... but having a loose copy allows for full recovery' \
-    'mv ${pack}.idx tmp &&
-     git hash-object -t blob -w file_2 &&
-     mv tmp ${pack}.idx &&
-     git cat-file blob $blob_1 > /dev/null &&
-     git cat-file blob $blob_2 > /dev/null &&
-     git cat-file blob $blob_3 > /dev/null'
-
-test_expect_success \
-    '... and then a repack "clears" the corruption' \
-    'do_repack --delta-base-offset &&
-     git prune-packed &&
-     git verify-pack ${pack}.pack &&
-     git cat-file blob $blob_1 > /dev/null &&
-     git cat-file blob $blob_2 > /dev/null &&
-     git cat-file blob $blob_3 > /dev/null'
-
-test_expect_success \
-    'corruption #1 in delta base reference of first delta (OBJ_OFS_DELTA)' \
-    'create_new_pack --delta-base-offset &&
-     git prune-packed &&
-     printf "\001" | do_corrupt_object $blob_2 2 &&
-     git cat-file blob $blob_1 > /dev/null &&
-     test_must_fail git cat-file blob $blob_2 > /dev/null &&
-     test_must_fail git cat-file blob $blob_3 > /dev/null'
-
-test_expect_success \
-    '... but having a loose copy allows for full recovery' \
-    'mv ${pack}.idx tmp &&
-     git hash-object -t blob -w file_2 &&
-     mv tmp ${pack}.idx &&
-     git cat-file blob $blob_1 > /dev/null &&
-     git cat-file blob $blob_2 > /dev/null &&
-     git cat-file blob $blob_3 > /dev/null'
-
-test_expect_success \
-    '... and then a repack "clears" the corruption' \
-    'do_repack --delta-base-offset &&
-     git prune-packed &&
-     git verify-pack ${pack}.pack &&
-     git cat-file blob $blob_1 > /dev/null &&
-     git cat-file blob $blob_2 > /dev/null &&
-     git cat-file blob $blob_3 > /dev/null'
-
-test_expect_success \
-    '... and a redundant pack allows for full recovery too' \
-    'do_corrupt_object $blob_2 2 < zero &&
-     git cat-file blob $blob_1 > /dev/null &&
-     test_must_fail git cat-file blob $blob_2 > /dev/null &&
-     test_must_fail git cat-file blob $blob_3 > /dev/null &&
-     mv ${pack}.idx tmp &&
-     git hash-object -t blob -w file_1 &&
-     git hash-object -t blob -w file_2 &&
-     printf "$blob_1\n$blob_2\n" | git pack-objects .git/objects/pack/pack &&
-     git prune-packed &&
-     mv tmp ${pack}.idx &&
-     git cat-file blob $blob_1 > /dev/null &&
-     git cat-file blob $blob_2 > /dev/null &&
-     git cat-file blob $blob_3 > /dev/null'
-
-test_expect_success \
-    'corruption of delta base reference pointing to wrong object' \
-    'create_new_pack --delta-base-offset &&
-     git prune-packed &&
-     printf "\220\033" | do_corrupt_object $blob_3 2 &&
-     git cat-file blob $blob_1 >/dev/null &&
-     git cat-file blob $blob_2 >/dev/null &&
-     test_must_fail git cat-file blob $blob_3 >/dev/null'
-
-test_expect_success \
-    '... but having a loose copy allows for full recovery' \
-    'mv ${pack}.idx tmp &&
-     git hash-object -t blob -w file_3 &&
-     mv tmp ${pack}.idx &&
-     git cat-file blob $blob_1 > /dev/null &&
-     git cat-file blob $blob_2 > /dev/null &&
-     git cat-file blob $blob_3 > /dev/null'
-
-test_expect_success \
-    '... and then a repack "clears" the corruption' \
-    'do_repack --delta-base-offset --no-reuse-delta &&
-     git prune-packed &&
-     git verify-pack ${pack}.pack &&
-     git cat-file blob $blob_1 > /dev/null &&
-     git cat-file blob $blob_2 > /dev/null &&
-     git cat-file blob $blob_3 > /dev/null'
-
-test_expect_success \
-    'corrupting header to have too small output buffer fails unpack' \
-    'create_new_pack &&
-     git prune-packed &&
-     printf "\262\001" | do_corrupt_object $blob_1 0 &&
-     test_must_fail git cat-file blob $blob_1 > /dev/null &&
-     test_must_fail git cat-file blob $blob_2 > /dev/null &&
-     test_must_fail git cat-file blob $blob_3 > /dev/null'
+test_expect_success 'initial setup validation' '
+	create_test_files &&
+	create_new_pack &&
+	git prune-packed &&
+	git cat-file blob $blob_1 > /dev/null &&
+	git cat-file blob $blob_2 > /dev/null &&
+	git cat-file blob $blob_3 > /dev/null
+'
+
+test_expect_success 'create corruption in header of first object' '
+	do_corrupt_object $blob_1 0 < zero &&
+	test_must_fail git cat-file blob $blob_1 > /dev/null &&
+	test_must_fail git cat-file blob $blob_2 > /dev/null &&
+	test_must_fail git cat-file blob $blob_3 > /dev/null
+'
+
+test_expect_success '... but having a loose copy allows for full recovery' '
+	mv ${pack}.idx tmp &&
+	git hash-object -t blob -w file_1 &&
+	mv tmp ${pack}.idx &&
+	git cat-file blob $blob_1 > /dev/null &&
+	git cat-file blob $blob_2 > /dev/null &&
+	git cat-file blob $blob_3 > /dev/null
+'
+
+test_expect_success '... and loose copy of first delta allows for partial recovery' '
+	git prune-packed &&
+	test_must_fail git cat-file blob $blob_2 > /dev/null &&
+	mv ${pack}.idx tmp &&
+	git hash-object -t blob -w file_2 &&
+	mv tmp ${pack}.idx &&
+	test_must_fail git cat-file blob $blob_1 > /dev/null &&
+	git cat-file blob $blob_2 > /dev/null &&
+	git cat-file blob $blob_3 > /dev/null
+'
+
+test_expect_success 'create corruption in data of first object' '
+	create_new_pack &&
+	git prune-packed &&
+	chmod +w ${pack}.pack &&
+	perl -i.bak -pe "s/ base /abcdef/" ${pack}.pack &&
+	test_must_fail git cat-file blob $blob_1 > /dev/null &&
+	test_must_fail git cat-file blob $blob_2 > /dev/null &&
+	test_must_fail git cat-file blob $blob_3 > /dev/null
+'
+
+test_expect_success '... but having a loose copy allows for full recovery' '
+	mv ${pack}.idx tmp &&
+	git hash-object -t blob -w file_1 &&
+	mv tmp ${pack}.idx &&
+	git cat-file blob $blob_1 > /dev/null &&
+	git cat-file blob $blob_2 > /dev/null &&
+	git cat-file blob $blob_3 > /dev/null
+'
+
+test_expect_success '... and loose copy of second object allows for partial recovery' '
+	git prune-packed &&
+	test_must_fail git cat-file blob $blob_2 > /dev/null &&
+	mv ${pack}.idx tmp &&
+	git hash-object -t blob -w file_2 &&
+	mv tmp ${pack}.idx &&
+	test_must_fail git cat-file blob $blob_1 > /dev/null &&
+	git cat-file blob $blob_2 > /dev/null &&
+	git cat-file blob $blob_3 > /dev/null
+'
+
+test_expect_success 'create corruption in header of first delta' '
+	create_new_pack &&
+	git prune-packed &&
+	do_corrupt_object $blob_2 0 < zero &&
+	git cat-file blob $blob_1 > /dev/null &&
+	test_must_fail git cat-file blob $blob_2 > /dev/null &&
+	test_must_fail git cat-file blob $blob_3 > /dev/null
+'
+
+test_expect_success '... but having a loose copy allows for full recovery' '
+	mv ${pack}.idx tmp &&
+	git hash-object -t blob -w file_2 &&
+	mv tmp ${pack}.idx &&
+	git cat-file blob $blob_1 > /dev/null &&
+	git cat-file blob $blob_2 > /dev/null &&
+	git cat-file blob $blob_3 > /dev/null
+'
+
+test_expect_success '... and then a repack "clears" the corruption' '
+	do_repack &&
+	git prune-packed &&
+	git verify-pack ${pack}.pack &&
+	git cat-file blob $blob_1 > /dev/null &&
+	git cat-file blob $blob_2 > /dev/null &&
+	git cat-file blob $blob_3 > /dev/null
+'
+
+test_expect_success 'create corruption in data of first delta' '
+	create_new_pack &&
+	git prune-packed &&
+	chmod +w ${pack}.pack &&
+	perl -i.bak -pe "s/ delta1 /abcdefgh/" ${pack}.pack &&
+	git cat-file blob $blob_1 > /dev/null &&
+	test_must_fail git cat-file blob $blob_2 > /dev/null &&
+	test_must_fail git cat-file blob $blob_3 > /dev/null
+'
+
+test_expect_success '... but having a loose copy allows for full recovery' '
+	mv ${pack}.idx tmp &&
+	git hash-object -t blob -w file_2 &&
+	mv tmp ${pack}.idx &&
+	git cat-file blob $blob_1 > /dev/null &&
+	git cat-file blob $blob_2 > /dev/null &&
+	git cat-file blob $blob_3 > /dev/null
+'
+
+test_expect_success '... and then a repack "clears" the corruption' '
+	do_repack &&
+	git prune-packed &&
+	git verify-pack ${pack}.pack &&
+	git cat-file blob $blob_1 > /dev/null &&
+	git cat-file blob $blob_2 > /dev/null &&
+	git cat-file blob $blob_3 > /dev/null
+'
+
+test_expect_success 'corruption in delta base reference of first delta (OBJ_REF_DELTA)' '
+	create_new_pack &&
+	git prune-packed &&
+	do_corrupt_object $blob_2 2 < zero &&
+	git cat-file blob $blob_1 > /dev/null &&
+	test_must_fail git cat-file blob $blob_2 > /dev/null &&
+	test_must_fail git cat-file blob $blob_3 > /dev/null
+'
+
+test_expect_success '... but having a loose copy allows for full recovery' '
+	mv ${pack}.idx tmp &&
+	git hash-object -t blob -w file_2 &&
+	mv tmp ${pack}.idx &&
+	git cat-file blob $blob_1 > /dev/null &&
+	git cat-file blob $blob_2 > /dev/null &&
+	git cat-file blob $blob_3 > /dev/null
+'
+
+test_expect_success '... and then a repack "clears" the corruption' '
+	do_repack &&
+	git prune-packed &&
+	git verify-pack ${pack}.pack &&
+	git cat-file blob $blob_1 > /dev/null &&
+	git cat-file blob $blob_2 > /dev/null &&
+	git cat-file blob $blob_3 > /dev/null
+'
+
+test_expect_success 'corruption #0 in delta base reference of first delta (OBJ_OFS_DELTA)' '
+	create_new_pack --delta-base-offset &&
+	git prune-packed &&
+	do_corrupt_object $blob_2 2 < zero &&
+	git cat-file blob $blob_1 > /dev/null &&
+	test_must_fail git cat-file blob $blob_2 > /dev/null &&
+	test_must_fail git cat-file blob $blob_3 > /dev/null
+'
+
+test_expect_success '... but having a loose copy allows for full recovery' '
+	mv ${pack}.idx tmp &&
+	git hash-object -t blob -w file_2 &&
+	mv tmp ${pack}.idx &&
+	git cat-file blob $blob_1 > /dev/null &&
+	git cat-file blob $blob_2 > /dev/null &&
+	git cat-file blob $blob_3 > /dev/null
+'
+
+test_expect_success '... and then a repack "clears" the corruption' '
+	do_repack --delta-base-offset &&
+	git prune-packed &&
+	git verify-pack ${pack}.pack &&
+	git cat-file blob $blob_1 > /dev/null &&
+	git cat-file blob $blob_2 > /dev/null &&
+	git cat-file blob $blob_3 > /dev/null
+'
+
+test_expect_success 'corruption #1 in delta base reference of first delta (OBJ_OFS_DELTA)' '
+	create_new_pack --delta-base-offset &&
+	git prune-packed &&
+	printf "\001" | do_corrupt_object $blob_2 2 &&
+	git cat-file blob $blob_1 > /dev/null &&
+	test_must_fail git cat-file blob $blob_2 > /dev/null &&
+	test_must_fail git cat-file blob $blob_3 > /dev/null
+'
+
+test_expect_success '... but having a loose copy allows for full recovery' '
+	mv ${pack}.idx tmp &&
+	git hash-object -t blob -w file_2 &&
+	mv tmp ${pack}.idx &&
+	git cat-file blob $blob_1 > /dev/null &&
+	git cat-file blob $blob_2 > /dev/null &&
+	git cat-file blob $blob_3 > /dev/null
+'
+
+test_expect_success '... and then a repack "clears" the corruption' '
+	do_repack --delta-base-offset &&
+	git prune-packed &&
+	git verify-pack ${pack}.pack &&
+	git cat-file blob $blob_1 > /dev/null &&
+	git cat-file blob $blob_2 > /dev/null &&
+	git cat-file blob $blob_3 > /dev/null
+'
+
+test_expect_success '... and a redundant pack allows for full recovery too' '
+	do_corrupt_object $blob_2 2 < zero &&
+	git cat-file blob $blob_1 > /dev/null &&
+	test_must_fail git cat-file blob $blob_2 > /dev/null &&
+	test_must_fail git cat-file blob $blob_3 > /dev/null &&
+	mv ${pack}.idx tmp &&
+	git hash-object -t blob -w file_1 &&
+	git hash-object -t blob -w file_2 &&
+	printf "$blob_1\n$blob_2\n" | git pack-objects .git/objects/pack/pack &&
+	git prune-packed &&
+	mv tmp ${pack}.idx &&
+	git cat-file blob $blob_1 > /dev/null &&
+	git cat-file blob $blob_2 > /dev/null &&
+	git cat-file blob $blob_3 > /dev/null
+'
+
+test_expect_success 'corruption of delta base reference pointing to wrong object' '
+	create_new_pack --delta-base-offset &&
+	git prune-packed &&
+	printf "\220\033" | do_corrupt_object $blob_3 2 &&
+	git cat-file blob $blob_1 >/dev/null &&
+	git cat-file blob $blob_2 >/dev/null &&
+	test_must_fail git cat-file blob $blob_3 >/dev/null
+'
+
+test_expect_success '... but having a loose copy allows for full recovery' '
+	mv ${pack}.idx tmp &&
+	git hash-object -t blob -w file_3 &&
+	mv tmp ${pack}.idx &&
+	git cat-file blob $blob_1 > /dev/null &&
+	git cat-file blob $blob_2 > /dev/null &&
+	git cat-file blob $blob_3 > /dev/null
+'
+
+test_expect_success '... and then a repack "clears" the corruption' '
+	do_repack --delta-base-offset --no-reuse-delta &&
+	git prune-packed &&
+	git verify-pack ${pack}.pack &&
+	git cat-file blob $blob_1 > /dev/null &&
+	git cat-file blob $blob_2 > /dev/null &&
+	git cat-file blob $blob_3 > /dev/null
+'
+
+test_expect_success 'corrupting header to have too small output buffer fails unpack' '
+	create_new_pack &&
+	git prune-packed &&
+	printf "\262\001" | do_corrupt_object $blob_1 0 &&
+	test_must_fail git cat-file blob $blob_1 > /dev/null &&
+	test_must_fail git cat-file blob $blob_2 > /dev/null &&
+	test_must_fail git cat-file blob $blob_3 > /dev/null
+'
 
 # \0 - empty base
 # \1 - one byte in result
 # \1 - one literal byte (X)
-test_expect_success \
-    'apply good minimal delta' \
-    'printf "\0\1\1X" > minimal_delta &&
-     test-tool delta -p /dev/null minimal_delta /dev/null'
+test_expect_success 'apply good minimal delta' '
+	printf "\0\1\1X" > minimal_delta &&
+	test-tool delta -p /dev/null minimal_delta /dev/null
+'
 
 # \0 - empty base
 # \1 - 1 byte in result
 # \2 - two literal bytes (one too many)
-test_expect_success \
-    'apply delta with too many literal bytes' \
-    'printf "\0\1\2XX" > too_big_literal &&
-     test_must_fail test-tool delta -p /dev/null too_big_literal /dev/null'
+test_expect_success 'apply delta with too many literal bytes' '
+	printf "\0\1\2XX" > too_big_literal &&
+	test_must_fail test-tool delta -p /dev/null too_big_literal /dev/null
+'
 
 # \4 - four bytes in base
 # \1 - one byte in result
 # \221 - copy, one byte offset, one byte size
 #   \0 - copy from offset 0
 #   \2 - copy two bytes (one too many)
-test_expect_success \
-    'apply delta with too many copied bytes' \
-    'printf "\4\1\221\0\2" > too_big_copy &&
-     printf base >base &&
-     test_must_fail test-tool delta -p base too_big_copy /dev/null'
+test_expect_success 'apply delta with too many copied bytes' '
+	printf "\4\1\221\0\2" > too_big_copy &&
+	printf base >base &&
+	test_must_fail test-tool delta -p base too_big_copy /dev/null
+'
 
 # \0 - empty base
 # \2 - two bytes in result
 # \2 - two literal bytes (we are short one)
-test_expect_success \
-    'apply delta with too few literal bytes' \
-    'printf "\0\2\2X" > truncated_delta &&
-     test_must_fail test-tool delta -p /dev/null truncated_delta /dev/null'
+test_expect_success 'apply delta with too few literal bytes' '
+	printf "\0\2\2X" > truncated_delta &&
+	test_must_fail test-tool delta -p /dev/null truncated_delta /dev/null
+'
 
 # \0 - empty base
 # \1 - one byte in result
 # \221 - copy, one byte offset, one byte size
 #   \0 - copy from offset 0
 #   \1 - copy one byte (we are short one)
-test_expect_success \
-    'apply delta with too few bytes in base' \
-    'printf "\0\1\221\0\1" > truncated_base &&
-     test_must_fail test-tool delta -p /dev/null truncated_base /dev/null'
+test_expect_success 'apply delta with too few bytes in base' '
+	printf "\0\1\221\0\1" > truncated_base &&
+	test_must_fail test-tool delta -p /dev/null truncated_base /dev/null
+'
 
 # \4 - four bytes in base
 # \2 - two bytes in result
@@ -364,20 +366,20 @@ test_expect_success \
 #
 # Note that the literal byte is necessary to get past the uninteresting minimum
 # delta size check.
-test_expect_success \
-    'apply delta with truncated copy parameters' \
-    'printf "\4\2\1X\221" > truncated_copy_delta &&
-     printf base >base &&
-     test_must_fail test-tool delta -p base truncated_copy_delta /dev/null'
+test_expect_success 'apply delta with truncated copy parameters' '
+	printf "\4\2\1X\221" > truncated_copy_delta &&
+	printf base >base &&
+	test_must_fail test-tool delta -p base truncated_copy_delta /dev/null
+'
 
 # \0 - empty base
 # \1 - one byte in result
 # \1 - one literal byte (X)
 # \1 - trailing garbage command
-test_expect_success \
-    'apply delta with trailing garbage literal' \
-    'printf "\0\1\1X\1" > tail_garbage_literal &&
-     test_must_fail test-tool delta -p /dev/null tail_garbage_literal /dev/null'
+test_expect_success 'apply delta with trailing garbage literal' '
+	printf "\0\1\1X\1" > tail_garbage_literal &&
+	test_must_fail test-tool delta -p /dev/null tail_garbage_literal /dev/null
+'
 
 # \4 - four bytes in base
 # \1 - one byte in result
@@ -385,19 +387,19 @@ test_expect_success \
 # \221 - copy, one byte offset, one byte size
 #   \0 - copy from offset 0
 #   \1 - copy 1 byte
-test_expect_success \
-    'apply delta with trailing garbage copy' \
-    'printf "\4\1\1X\221\0\1" > tail_garbage_copy &&
-     printf base >base &&
-     test_must_fail test-tool delta -p /dev/null tail_garbage_copy /dev/null'
+test_expect_success 'apply delta with trailing garbage copy' '
+	printf "\4\1\1X\221\0\1" > tail_garbage_copy &&
+	printf base >base &&
+	test_must_fail test-tool delta -p /dev/null tail_garbage_copy /dev/null
+'
 
 # \0 - empty base
 # \1 - one byte in result
 # \1 - one literal byte (X)
 # \0 - bogus opcode
-test_expect_success \
-    'apply delta with trailing garbage opcode' \
-    'printf "\0\1\1X\0" > tail_garbage_opcode &&
-     test_must_fail test-tool delta -p /dev/null tail_garbage_opcode /dev/null'
+test_expect_success 'apply delta with trailing garbage opcode' '
+	printf "\0\1\1X\0" > tail_garbage_opcode &&
+	test_must_fail test-tool delta -p /dev/null tail_garbage_opcode /dev/null
+'
 
 test_done
diff --git a/t/t5304-prune.sh b/t/t5304-prune.sh
index df60f18..1f1f664 100755
--- a/t/t5304-prune.sh
+++ b/t/t5304-prune.sh
@@ -4,6 +4,9 @@
 #
 
 test_description='prune'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 day=$((60*60*24))
@@ -13,193 +16,174 @@ add_blob() {
 	before=$(git count-objects | sed "s/ .*//") &&
 	BLOB=$(echo aleph_0 | git hash-object -w --stdin) &&
 	BLOB_FILE=.git/objects/$(echo $BLOB | sed "s/^../&\//") &&
-	verbose test $((1 + $before)) = $(git count-objects | sed "s/ .*//") &&
+	test $((1 + $before)) = $(git count-objects | sed "s/ .*//") &&
 	test_path_is_file $BLOB_FILE &&
 	test-tool chmtime =+0 $BLOB_FILE
 }
 
 test_expect_success setup '
-
-	: > file &&
+	>file &&
 	git add file &&
 	test_tick &&
 	git commit -m initial &&
 	git gc
+'
 
+test_expect_success 'bare repo prune is quiet without $GIT_DIR/objects/pack' '
+	git clone -q --shared --template= --bare . bare.git &&
+	rmdir bare.git/objects/pack &&
+	git --git-dir=bare.git prune --no-progress 2>prune.err &&
+	test_must_be_empty prune.err &&
+	rm -r bare.git prune.err
 '
 
 test_expect_success 'prune stale packs' '
-
 	orig_pack=$(echo .git/objects/pack/*.pack) &&
-	: > .git/objects/tmp_1.pack &&
-	: > .git/objects/tmp_2.pack &&
+	>.git/objects/tmp_1.pack &&
+	>.git/objects/tmp_2.pack &&
 	test-tool chmtime =-86501 .git/objects/tmp_1.pack &&
 	git prune --expire 1.day &&
 	test_path_is_file $orig_pack &&
 	test_path_is_file .git/objects/tmp_2.pack &&
 	test_path_is_missing .git/objects/tmp_1.pack
-
 '
 
 test_expect_success 'prune --expire' '
-
 	add_blob &&
 	git prune --expire=1.hour.ago &&
-	verbose test $((1 + $before)) = $(git count-objects | sed "s/ .*//") &&
+	test $((1 + $before)) = $(git count-objects | sed "s/ .*//") &&
 	test_path_is_file $BLOB_FILE &&
 	test-tool chmtime =-86500 $BLOB_FILE &&
 	git prune --expire 1.day &&
-	verbose test $before = $(git count-objects | sed "s/ .*//") &&
+	test $before = $(git count-objects | sed "s/ .*//") &&
 	test_path_is_missing $BLOB_FILE
-
 '
 
 test_expect_success 'gc: implicit prune --expire' '
-
 	add_blob &&
 	test-tool chmtime =-$((2*$week-30)) $BLOB_FILE &&
-	git gc &&
-	verbose test $((1 + $before)) = $(git count-objects | sed "s/ .*//") &&
+	git gc --no-cruft &&
+	test $((1 + $before)) = $(git count-objects | sed "s/ .*//") &&
 	test_path_is_file $BLOB_FILE &&
 	test-tool chmtime =-$((2*$week+1)) $BLOB_FILE &&
-	git gc &&
-	verbose test $before = $(git count-objects | sed "s/ .*//") &&
+	git gc --no-cruft &&
+	test $before = $(git count-objects | sed "s/ .*//") &&
 	test_path_is_missing $BLOB_FILE
-
 '
 
 test_expect_success 'gc: refuse to start with invalid gc.pruneExpire' '
-
-	git config gc.pruneExpire invalid &&
-	test_must_fail git gc
-
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	>repo/.git/config &&
+	git -C repo config gc.pruneExpire invalid &&
+	cat >expect <<-\EOF &&
+	error: Invalid gc.pruneexpire: '\''invalid'\''
+	fatal: bad config variable '\''gc.pruneexpire'\'' in file '\''.git/config'\'' at line 2
+	EOF
+	test_must_fail git -C repo gc 2>actual &&
+	test_cmp expect actual
 '
 
 test_expect_success 'gc: start with ok gc.pruneExpire' '
-
 	git config gc.pruneExpire 2.days.ago &&
-	git gc
-
+	git gc --no-cruft
 '
 
 test_expect_success 'prune: prune nonsense parameters' '
-
 	test_must_fail git prune garbage &&
 	test_must_fail git prune --- &&
 	test_must_fail git prune --no-such-option
-
 '
 
 test_expect_success 'prune: prune unreachable heads' '
-
 	git config core.logAllRefUpdates false &&
-	mv .git/logs .git/logs.old &&
-	: > file2 &&
+	>file2 &&
 	git add file2 &&
 	git commit -m temporary &&
 	tmp_head=$(git rev-list -1 HEAD) &&
 	git reset HEAD^ &&
+	git reflog expire --all &&
 	git prune &&
 	test_must_fail git reset $tmp_head --
-
 '
 
 test_expect_success 'prune: do not prune detached HEAD with no reflog' '
-
 	git checkout --detach --quiet &&
 	git commit --allow-empty -m "detached commit" &&
-	# verify that there is no reflogs
-	# (should be removed and disabled by previous test)
-	test_path_is_missing .git/logs &&
+	git reflog expire --all &&
 	git prune -n >prune_actual &&
 	test_must_be_empty prune_actual
-
 '
 
 test_expect_success 'prune: prune former HEAD after checking out branch' '
-
 	head_oid=$(git rev-parse HEAD) &&
-	git checkout --quiet master &&
+	git checkout --quiet main &&
+	git reflog expire --all &&
 	git prune -v >prune_actual &&
 	grep "$head_oid" prune_actual
-
 '
 
 test_expect_success 'prune: do not prune heads listed as an argument' '
-
-	: > file2 &&
+	>file2 &&
 	git add file2 &&
 	git commit -m temporary &&
 	tmp_head=$(git rev-list -1 HEAD) &&
 	git reset HEAD^ &&
 	git prune -- $tmp_head &&
 	git reset $tmp_head --
-
 '
 
 test_expect_success 'gc --no-prune' '
-
 	add_blob &&
 	test-tool chmtime =-$((5001*$day)) $BLOB_FILE &&
 	git config gc.pruneExpire 2.days.ago &&
-	git gc --no-prune &&
-	verbose test 1 = $(git count-objects | sed "s/ .*//") &&
+	git gc --no-prune --no-cruft &&
+	test 1 = $(git count-objects | sed "s/ .*//") &&
 	test_path_is_file $BLOB_FILE
-
 '
 
 test_expect_success 'gc respects gc.pruneExpire' '
-
 	git config gc.pruneExpire 5002.days.ago &&
-	git gc &&
+	git gc --no-cruft &&
 	test_path_is_file $BLOB_FILE &&
 	git config gc.pruneExpire 5000.days.ago &&
-	git gc &&
+	git gc --no-cruft &&
 	test_path_is_missing $BLOB_FILE
-
 '
 
 test_expect_success 'gc --prune=<date>' '
-
 	add_blob &&
 	test-tool chmtime =-$((5001*$day)) $BLOB_FILE &&
-	git gc --prune=5002.days.ago &&
+	git gc --prune=5002.days.ago --no-cruft &&
 	test_path_is_file $BLOB_FILE &&
-	git gc --prune=5000.days.ago &&
+	git gc --prune=5000.days.ago --no-cruft &&
 	test_path_is_missing $BLOB_FILE
-
 '
 
 test_expect_success 'gc --prune=never' '
-
 	add_blob &&
-	git gc --prune=never &&
+	git gc --prune=never --no-cruft &&
 	test_path_is_file $BLOB_FILE &&
-	git gc --prune=now &&
+	git gc --prune=now --no-cruft &&
 	test_path_is_missing $BLOB_FILE
-
 '
 
 test_expect_success 'gc respects gc.pruneExpire=never' '
-
 	git config gc.pruneExpire never &&
 	add_blob &&
-	git gc &&
+	git gc --no-cruft &&
 	test_path_is_file $BLOB_FILE &&
 	git config gc.pruneExpire now &&
-	git gc &&
+	git gc --no-cruft &&
 	test_path_is_missing $BLOB_FILE
-
 '
 
 test_expect_success 'prune --expire=never' '
-
 	add_blob &&
 	git prune --expire=never &&
 	test_path_is_file $BLOB_FILE &&
 	git prune &&
 	test_path_is_missing $BLOB_FILE
-
 '
 
 test_expect_success 'gc: prune old objects after local clone' '
@@ -208,10 +192,10 @@ test_expect_success 'gc: prune old objects after local clone' '
 	git clone --no-hardlinks . aclone &&
 	(
 		cd aclone &&
-		verbose test 1 = $(git count-objects | sed "s/ .*//") &&
+		test 1 = $(git count-objects | sed "s/ .*//") &&
 		test_path_is_file $BLOB_FILE &&
-		git gc --prune &&
-		verbose test 0 = $(git count-objects | sed "s/ .*//") &&
+		git gc --prune --no-cruft &&
+		test 0 = $(git count-objects | sed "s/ .*//") &&
 		test_path_is_missing $BLOB_FILE
 	)
 '
@@ -219,16 +203,16 @@ test_expect_success 'gc: prune old objects after local clone' '
 test_expect_success 'garbage report in count-objects -v' '
 	test_when_finished "rm -f .git/objects/pack/fake*" &&
 	test_when_finished "rm -f .git/objects/pack/foo*" &&
-	: >.git/objects/pack/foo &&
-	: >.git/objects/pack/foo.bar &&
-	: >.git/objects/pack/foo.keep &&
-	: >.git/objects/pack/foo.pack &&
-	: >.git/objects/pack/fake.bar &&
-	: >.git/objects/pack/fake.keep &&
-	: >.git/objects/pack/fake.pack &&
-	: >.git/objects/pack/fake.idx &&
-	: >.git/objects/pack/fake2.keep &&
-	: >.git/objects/pack/fake3.idx &&
+	>.git/objects/pack/foo &&
+	>.git/objects/pack/foo.bar &&
+	>.git/objects/pack/foo.keep &&
+	>.git/objects/pack/foo.pack &&
+	>.git/objects/pack/fake.bar &&
+	>.git/objects/pack/fake.keep &&
+	>.git/objects/pack/fake.pack &&
+	>.git/objects/pack/fake.idx &&
+	>.git/objects/pack/fake2.keep &&
+	>.git/objects/pack/fake3.idx &&
 	git count-objects -v 2>stderr &&
 	grep "index file .git/objects/pack/fake.idx is too small" stderr &&
 	grep "^warning:" stderr | sort >actual &&
@@ -247,13 +231,13 @@ EOF
 test_expect_success 'clean pack garbage with gc' '
 	test_when_finished "rm -f .git/objects/pack/fake*" &&
 	test_when_finished "rm -f .git/objects/pack/foo*" &&
-	: >.git/objects/pack/foo.keep &&
-	: >.git/objects/pack/foo.pack &&
-	: >.git/objects/pack/fake.idx &&
-	: >.git/objects/pack/fake2.keep &&
-	: >.git/objects/pack/fake2.idx &&
-	: >.git/objects/pack/fake3.keep &&
-	git gc &&
+	>.git/objects/pack/foo.keep &&
+	>.git/objects/pack/foo.pack &&
+	>.git/objects/pack/fake.idx &&
+	>.git/objects/pack/fake2.keep &&
+	>.git/objects/pack/fake2.idx &&
+	>.git/objects/pack/fake3.keep &&
+	git gc --no-cruft &&
 	git count-objects -v 2>stderr &&
 	grep "^warning:" stderr | sort >actual &&
 	cat >expected <<\EOF &&
@@ -323,6 +307,7 @@ test_expect_success 'prune: handle HEAD reflog in multiple worktrees' '
 		cat ../expected >blob &&
 		git add blob &&
 		git commit -m "second commit in third" &&
+		git clean -f && # Remove untracked left behind by deleting index
 		git reset --hard HEAD^
 	) &&
 	git prune --expire=now &&
@@ -333,10 +318,10 @@ test_expect_success 'prune: handle HEAD reflog in multiple worktrees' '
 
 test_expect_success 'prune: handle expire option correctly' '
 	test_must_fail git prune --expire 2>error &&
-	test_i18ngrep "requires a value" error &&
+	test_grep "requires a value" error &&
 
 	test_must_fail git prune --expire=nyah 2>error &&
-	test_i18ngrep "malformed expiration" error &&
+	test_grep "malformed expiration" error &&
 
 	git prune --no-expire
 '
@@ -349,4 +334,34 @@ test_expect_success 'trivial prune with bitmaps enabled' '
 	test_must_fail git cat-file -e $blob
 '
 
+test_expect_success 'old reachable-from-recent retained with bitmaps' '
+	git repack -adb &&
+	to_drop=$(echo bitmap-from-recent-1 | git hash-object -w --stdin) &&
+	test-tool chmtime -86400 .git/objects/$(test_oid_to_path $to_drop) &&
+	to_save=$(echo bitmap-from-recent-2 | git hash-object -w --stdin) &&
+	test-tool chmtime -86400 .git/objects/$(test_oid_to_path $to_save) &&
+	tree=$(printf "100644 blob $to_save\tfile\n" | git mktree) &&
+	test-tool chmtime -86400 .git/objects/$(test_oid_to_path $tree) &&
+	commit=$(echo foo | git commit-tree $tree) &&
+	git prune --expire=12.hours.ago &&
+	git cat-file -e $commit &&
+	git cat-file -e $tree &&
+	git cat-file -e $to_save &&
+	test_must_fail git cat-file -e $to_drop
+'
+
+test_expect_success 'gc.recentObjectsHook' '
+	add_blob &&
+	test-tool chmtime =-86500 $BLOB_FILE &&
+
+	write_script precious-objects <<-EOF &&
+	echo $BLOB
+	EOF
+	test_config gc.recentObjectsHook ./precious-objects &&
+
+	git prune --expire=now &&
+
+	git cat-file -p $BLOB
+'
+
 test_done
diff --git a/t/t5305-include-tag.sh b/t/t5305-include-tag.sh
index a5eca21..44bd9ef 100755
--- a/t/t5305-include-tag.sh
+++ b/t/t5305-include-tag.sh
@@ -1,6 +1,9 @@
 #!/bin/sh
 
 test_description='git pack-object --include-tag'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 TRASH=$(pwd)
@@ -111,7 +114,7 @@ test_expect_success 'check unpacked result (have all objects)' '
 
 test_expect_success 'single-branch clone can transfer tag' '
 	rm -rf clone.git &&
-	git clone --no-local --single-branch -b master . clone.git &&
+	git clone --no-local --single-branch -b main . clone.git &&
 	git -C clone.git fsck
 '
 
diff --git a/t/t5306-pack-nobase.sh b/t/t5306-pack-nobase.sh
index f4931c0..0d50c6b 100755
--- a/t/t5306-pack-nobase.sh
+++ b/t/t5306-pack-nobase.sh
@@ -6,22 +6,23 @@
 test_description='git-pack-object with missing base
 
 '
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # Create A-B chain
 #
-test_expect_success \
-    'setup base' \
-    'for a in a b c d e f g h i; do echo $a >>text; done &&
-     echo side >side &&
-     git update-index --add text side &&
-     A=$(echo A | git commit-tree $(git write-tree)) &&
+test_expect_success 'setup base' '
+	test_write_lines a b c d e f g h i >text &&
+	echo side >side &&
+	git update-index --add text side &&
+	A=$(echo A | git commit-tree $(git write-tree)) &&
 
-     echo m >>text &&
-     git update-index text &&
-     B=$(echo B | git commit-tree $(git write-tree) -p $A) &&
-     git update-ref HEAD $B
-    '
+	echo m >>text &&
+	git update-index text &&
+	B=$(echo B | git commit-tree $(git write-tree) -p $A) &&
+	git update-ref HEAD $B
+'
 
 # Create repository with C whose parent is B.
 # Repository contains C, C^{tree}, C:text, B, B^{tree}.
@@ -29,52 +30,49 @@ test_expect_success \
 # Repository is missing A (parent of B).
 # Repository is missing A:side.
 #
-test_expect_success \
-    'setup patch_clone' \
-    'base_objects=$(pwd)/.git/objects &&
-     (mkdir patch_clone &&
-      cd patch_clone &&
-      git init &&
-      echo "$base_objects" >.git/objects/info/alternates &&
-      echo q >>text &&
-      git read-tree $B &&
-      git update-index text &&
-      git update-ref HEAD $(echo C | git commit-tree $(git write-tree) -p $B) &&
-      rm .git/objects/info/alternates &&
+test_expect_success 'setup patch_clone' '
+	base_objects=$(pwd)/.git/objects &&
+	(mkdir patch_clone &&
+	cd patch_clone &&
+	git init &&
+	echo "$base_objects" >.git/objects/info/alternates &&
+	echo q >>text &&
+	git read-tree $B &&
+	git update-index text &&
+	git update-ref HEAD $(echo C | git commit-tree $(git write-tree) -p $B) &&
+	rm .git/objects/info/alternates &&
 
-      git --git-dir=../.git cat-file commit $B |
-      git hash-object -t commit -w --stdin &&
+	git --git-dir=../.git cat-file commit $B |
+	git hash-object -t commit -w --stdin &&
 
-      git --git-dir=../.git cat-file tree "$B^{tree}" |
-      git hash-object -t tree -w --stdin
-     ) &&
-     C=$(git --git-dir=patch_clone/.git rev-parse HEAD)
-    '
+	git --git-dir=../.git cat-file tree "$B^{tree}" |
+	git hash-object -t tree -w --stdin
+	) &&
+	C=$(git --git-dir=patch_clone/.git rev-parse HEAD)
+'
 
 # Clone patch_clone indirectly by cloning base and fetching.
 #
-test_expect_success \
-    'indirectly clone patch_clone' \
-    '(mkdir user_clone &&
-      cd user_clone &&
-      git init &&
-      git pull ../.git &&
-      test $(git rev-parse HEAD) = $B &&
+test_expect_success 'indirectly clone patch_clone' '
+	(mkdir user_clone &&
+	 cd user_clone &&
+	 git init &&
+	 git pull ../.git &&
+	 test $(git rev-parse HEAD) = $B &&
 
-      git pull ../patch_clone/.git &&
-      test $(git rev-parse HEAD) = $C
-     )
-    '
+	 git pull ../patch_clone/.git &&
+	 test $(git rev-parse HEAD) = $C
+	)
+'
 
 # Cloning the patch_clone directly should fail.
 #
-test_expect_success \
-    'clone of patch_clone is incomplete' \
-    '(mkdir user_direct &&
-      cd user_direct &&
-      git init &&
-      test_must_fail git fetch ../patch_clone/.git
-     )
-    '
+test_expect_success 'clone of patch_clone is incomplete' '
+	(mkdir user_direct &&
+	 cd user_direct &&
+	 git init &&
+	 test_must_fail git fetch ../patch_clone/.git
+	)
+'
 
 test_done
diff --git a/t/t5307-pack-missing-commit.sh b/t/t5307-pack-missing-commit.sh
index f4338ab..1e02c30 100755
--- a/t/t5307-pack-missing-commit.sh
+++ b/t/t5307-pack-missing-commit.sh
@@ -2,6 +2,7 @@
 
 test_description='pack should notice missing commit objects'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -11,7 +12,7 @@ test_expect_success setup '
 		git add "file$i" &&
 		test_tick &&
 		git commit -m "$i" &&
-		git tag "tag$i"
+		git tag "tag$i" || return 1
 	done &&
 	obj=$(git rev-parse --verify tag3) &&
 	fanout=$(expr "$obj" : "\(..\)") &&
diff --git a/t/t5308-pack-detect-duplicates.sh b/t/t5308-pack-detect-duplicates.sh
index 693b241..655cafa 100755
--- a/t/t5308-pack-detect-duplicates.sh
+++ b/t/t5308-pack-detect-duplicates.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='handling of duplicate objects in incoming packfiles'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-pack.sh
 
diff --git a/t/t5309-pack-delta-cycles.sh b/t/t5309-pack-delta-cycles.sh
index 55b7876..4e910c5 100755
--- a/t/t5309-pack-delta-cycles.sh
+++ b/t/t5309-pack-delta-cycles.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='test index-pack handling of delta cycles in packfiles'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-pack.sh
 
diff --git a/t/t5310-pack-bitmaps.sh b/t/t5310-pack-bitmaps.sh
index 8318781..d7fd713 100755
--- a/t/t5310-pack-bitmaps.sh
+++ b/t/t5310-pack-bitmaps.sh
@@ -1,7 +1,17 @@
 #!/bin/sh
 
 test_description='exercise basic bitmap functionality'
+
 . ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-bitmap.sh
+
+# t5310 deals only with single-pack bitmaps, so don't write MIDX bitmaps in
+# their place.
+GIT_TEST_MULTI_PACK_INDEX_WRITE_BITMAP=0
+
+# Likewise, allow individual tests to control whether or not they use
+# the boundary-based traversal.
+sane_unset GIT_TEST_PACK_USE_BITMAP_BOUNDARY_TRAVERSAL
 
 objpath () {
 	echo ".git/objects/$(echo "$1" | sed -e 's|\(..\)|\1/|')"
@@ -20,331 +30,493 @@ has_any () {
 	grep -Ff "$1" "$2"
 }
 
-test_expect_success 'setup repo with moderate-sized history' '
-	test_commit_bulk --id=file 100 &&
-	git checkout -b other HEAD~5 &&
-	test_commit_bulk --id=side 10 &&
-	git checkout master &&
-	bitmaptip=$(git rev-parse master) &&
-	blob=$(echo tagged-blob | git hash-object -w --stdin) &&
-	git tag tagged-blob $blob &&
-	git config repack.writebitmaps true
-'
+test_bitmap_cases () {
+	writeLookupTable=false
+	for i in "$@"
+	do
+		case "$i" in
+		"pack.writeBitmapLookupTable") writeLookupTable=true;;
+		esac
+	done
+
+	test_expect_success 'setup test repository' '
+		rm -fr * .git &&
+		git init &&
+		git config pack.writeBitmapLookupTable '"$writeLookupTable"'
+	'
+	setup_bitmap_history
 
-test_expect_success 'full repack creates bitmaps' '
-	git repack -ad &&
-	ls .git/objects/pack/ | grep bitmap >output &&
-	test_line_count = 1 output
-'
+	test_expect_success 'setup writing bitmaps during repack' '
+		git config repack.writeBitmaps true
+	'
 
-test_expect_success 'rev-list --test-bitmap verifies bitmaps' '
-	git rev-list --test-bitmap HEAD
-'
+	test_expect_success 'full repack creates bitmaps' '
+		GIT_TRACE2_EVENT="$(pwd)/trace" \
+			git repack -ad &&
+		ls .git/objects/pack/ | grep bitmap >output &&
+		test_line_count = 1 output &&
+		grep "\"key\":\"num_selected_commits\",\"value\":\"106\"" trace &&
+		grep "\"key\":\"num_maximal_commits\",\"value\":\"107\"" trace
+	'
 
-rev_list_tests() {
-	state=$1
+	basic_bitmap_tests
+
+	test_expect_success 'pack-objects respects --local (non-local loose)' '
+		git init --bare alt.git &&
+		echo $(pwd)/alt.git/objects >.git/objects/info/alternates &&
+		echo content1 >file1 &&
+		# non-local loose object which is not present in bitmapped pack
+		altblob=$(GIT_DIR=alt.git git hash-object -w file1) &&
+		# non-local loose object which is also present in bitmapped pack
+		git cat-file blob $blob | GIT_DIR=alt.git git hash-object -w --stdin &&
+		git add file1 &&
+		test_tick &&
+		git commit -m commit_file1 &&
+		echo HEAD | git pack-objects --local --stdout --revs >1.pack &&
+		git index-pack 1.pack &&
+		list_packed_objects 1.idx >1.objects &&
+		printf "%s\n" "$altblob" "$blob" >nonlocal-loose &&
+		! has_any nonlocal-loose 1.objects
+	'
 
-	test_expect_success "counting commits via bitmap ($state)" '
-		git rev-list --count HEAD >expect &&
-		git rev-list --use-bitmap-index --count HEAD >actual &&
-		test_cmp expect actual
+	test_expect_success 'pack-objects respects --honor-pack-keep (local non-bitmapped pack)' '
+		echo content2 >file2 &&
+		blob2=$(git hash-object -w file2) &&
+		git add file2 &&
+		test_tick &&
+		git commit -m commit_file2 &&
+		printf "%s\n" "$blob2" "$bitmaptip" >keepobjects &&
+		pack2=$(git pack-objects pack2 <keepobjects) &&
+		mv pack2-$pack2.* .git/objects/pack/ &&
+		>.git/objects/pack/pack2-$pack2.keep &&
+		rm $(objpath $blob2) &&
+		echo HEAD | git pack-objects --honor-pack-keep --stdout --revs >2a.pack &&
+		git index-pack 2a.pack &&
+		list_packed_objects 2a.idx >2a.objects &&
+		! has_any keepobjects 2a.objects
 	'
 
-	test_expect_success "counting partial commits via bitmap ($state)" '
-		git rev-list --count HEAD~5..HEAD >expect &&
-		git rev-list --use-bitmap-index --count HEAD~5..HEAD >actual &&
-		test_cmp expect actual
+	test_expect_success 'pack-objects respects --local (non-local pack)' '
+		mv .git/objects/pack/pack2-$pack2.* alt.git/objects/pack/ &&
+		echo HEAD | git pack-objects --local --stdout --revs >2b.pack &&
+		git index-pack 2b.pack &&
+		list_packed_objects 2b.idx >2b.objects &&
+		! has_any keepobjects 2b.objects
 	'
 
-	test_expect_success "counting commits with limit ($state)" '
-		git rev-list --count -n 1 HEAD >expect &&
-		git rev-list --use-bitmap-index --count -n 1 HEAD >actual &&
-		test_cmp expect actual
+	test_expect_success 'pack-objects respects --honor-pack-keep (local bitmapped pack)' '
+		ls .git/objects/pack/ | grep bitmap >output &&
+		test_line_count = 1 output &&
+		packbitmap=$(basename $(cat output) .bitmap) &&
+		list_packed_objects .git/objects/pack/$packbitmap.idx >packbitmap.objects &&
+		test_when_finished "rm -f .git/objects/pack/$packbitmap.keep" &&
+		>.git/objects/pack/$packbitmap.keep &&
+		echo HEAD | git pack-objects --honor-pack-keep --stdout --revs >3a.pack &&
+		git index-pack 3a.pack &&
+		list_packed_objects 3a.idx >3a.objects &&
+		! has_any packbitmap.objects 3a.objects
 	'
 
-	test_expect_success "counting non-linear history ($state)" '
-		git rev-list --count other...master >expect &&
-		git rev-list --use-bitmap-index --count other...master >actual &&
-		test_cmp expect actual
+	test_expect_success 'pack-objects respects --local (non-local bitmapped pack)' '
+		mv .git/objects/pack/$packbitmap.* alt.git/objects/pack/ &&
+		rm -f .git/objects/pack/multi-pack-index &&
+		test_when_finished "mv alt.git/objects/pack/$packbitmap.* .git/objects/pack/" &&
+		echo HEAD | git pack-objects --local --stdout --revs >3b.pack &&
+		git index-pack 3b.pack &&
+		list_packed_objects 3b.idx >3b.objects &&
+		! has_any packbitmap.objects 3b.objects
 	'
 
-	test_expect_success "counting commits with limiting ($state)" '
-		git rev-list --count HEAD -- 1.t >expect &&
-		git rev-list --use-bitmap-index --count HEAD -- 1.t >actual &&
-		test_cmp expect actual
+	test_expect_success 'pack-objects to file can use bitmap' '
+		# make sure we still have 1 bitmap index from previous tests
+		ls .git/objects/pack/ | grep bitmap >output &&
+		test_line_count = 1 output &&
+		# verify equivalent packs are generated with/without using bitmap index
+		packasha1=$(git pack-objects --no-use-bitmap-index --all packa </dev/null) &&
+		packbsha1=$(git pack-objects --use-bitmap-index --all packb </dev/null) &&
+		list_packed_objects packa-$packasha1.idx >packa.objects &&
+		list_packed_objects packb-$packbsha1.idx >packb.objects &&
+		test_cmp packa.objects packb.objects
 	'
 
-	test_expect_success "counting objects via bitmap ($state)" '
-		git rev-list --count --objects HEAD >expect &&
-		git rev-list --use-bitmap-index --count --objects HEAD >actual &&
+	test_expect_success 'full repack, reusing previous bitmaps' '
+		git repack -ad &&
+		ls .git/objects/pack/ | grep bitmap >output &&
+		test_line_count = 1 output
+	'
+
+	test_expect_success 'fetch (full bitmap)' '
+		git --git-dir=clone.git fetch origin second:second &&
+		git rev-parse HEAD >expect &&
+		git --git-dir=clone.git rev-parse HEAD >actual &&
 		test_cmp expect actual
 	'
 
-	test_expect_success "enumerate commits ($state)" '
-		git rev-list --use-bitmap-index HEAD >actual &&
-		git rev-list HEAD >expect &&
-		test_bitmap_traversal --no-confirm-bitmaps expect actual
+	test_expect_success 'create objects for missing-HAVE tests' '
+		blob=$(echo "missing have" | git hash-object -w --stdin) &&
+		tree=$(printf "100644 blob $blob\tfile\n" | git mktree) &&
+		parent=$(echo parent | git commit-tree $tree) &&
+		commit=$(echo commit | git commit-tree $tree -p $parent) &&
+		cat >revs <<-EOF
+		HEAD
+		^HEAD^
+		^$commit
+		EOF
 	'
 
-	test_expect_success "enumerate --objects ($state)" '
-		git rev-list --objects --use-bitmap-index HEAD >actual &&
-		git rev-list --objects HEAD >expect &&
-		test_bitmap_traversal expect actual
+	test_expect_success 'pack-objects respects --incremental' '
+		cat >revs2 <<-EOF &&
+		HEAD
+		$commit
+		EOF
+		git pack-objects --incremental --stdout --revs <revs2 >4.pack &&
+		git index-pack 4.pack &&
+		list_packed_objects 4.idx >4.objects &&
+		test_line_count = 4 4.objects &&
+		git rev-list --objects $commit >revlist &&
+		cut -d" " -f1 revlist |sort >objects &&
+		test_cmp 4.objects objects
 	'
 
-	test_expect_success "bitmap --objects handles non-commit objects ($state)" '
-		git rev-list --objects --use-bitmap-index HEAD tagged-blob >actual &&
-		grep $blob actual
+	test_expect_success 'pack with missing blob' '
+		rm $(objpath $blob) &&
+		git pack-objects --stdout --revs <revs >/dev/null
 	'
-}
 
-rev_list_tests 'full bitmap'
+	test_expect_success 'pack with missing tree' '
+		rm $(objpath $tree) &&
+		git pack-objects --stdout --revs <revs >/dev/null
+	'
 
-test_expect_success 'clone from bitmapped repository' '
-	git clone --no-local --bare . clone.git &&
-	git rev-parse HEAD >expect &&
-	git --git-dir=clone.git rev-parse HEAD >actual &&
-	test_cmp expect actual
-'
+	test_expect_success 'pack with missing parent' '
+		rm $(objpath $parent) &&
+		git pack-objects --stdout --revs <revs >/dev/null
+	'
 
-test_expect_success 'partial clone from bitmapped repository' '
-	test_config uploadpack.allowfilter true &&
-	git clone --no-local --bare --filter=blob:none . partial-clone.git &&
-	(
-		cd partial-clone.git &&
-		pack=$(echo objects/pack/*.pack) &&
-		git verify-pack -v "$pack" >have &&
-		awk "/blob/ { print \$1 }" <have >blobs &&
-		# we expect this single blob because of the direct ref
-		git rev-parse refs/tags/tagged-blob >expect &&
-		test_cmp expect blobs
-	)
-'
+	test_expect_success JGIT,SHA1 'we can read jgit bitmaps' '
+		git clone --bare . compat-jgit.git &&
+		(
+			cd compat-jgit.git &&
+			rm -f objects/pack/*.bitmap &&
+			jgit gc &&
+			git rev-list --test-bitmap HEAD
+		)
+	'
 
-test_expect_success 'setup further non-bitmapped commits' '
-	test_commit_bulk --id=further 10
-'
+	test_expect_success JGIT,SHA1 'jgit can read our bitmaps' '
+		git clone --bare . compat-us.git &&
+		(
+			cd compat-us.git &&
+			git config pack.writeBitmapLookupTable '"$writeLookupTable"' &&
+			git repack -adb &&
+			# jgit gc will barf if it does not like our bitmaps
+			jgit gc
+		)
+	'
 
-rev_list_tests 'partial bitmap'
+	test_expect_success 'splitting packs does not generate bogus bitmaps' '
+		test-tool genrandom foo $((1024 * 1024)) >rand &&
+		git add rand &&
+		git commit -m "commit with big file" &&
+		git -c pack.packSizeLimit=500k repack -adb &&
+		git init --bare no-bitmaps.git &&
+		git -C no-bitmaps.git fetch .. HEAD
+	'
 
-test_expect_success 'fetch (partial bitmap)' '
-	git --git-dir=clone.git fetch origin master:master &&
-	git rev-parse HEAD >expect &&
-	git --git-dir=clone.git rev-parse HEAD >actual &&
-	test_cmp expect actual
-'
+	test_expect_success 'set up reusable pack' '
+		rm -f .git/objects/pack/*.keep &&
+		git repack -adb &&
+		reusable_pack () {
+			git for-each-ref --format="%(objectname)" |
+			git pack-objects --delta-base-offset --revs --stdout "$@"
+		}
+	'
 
-test_expect_success 'incremental repack fails when bitmaps are requested' '
-	test_commit more-1 &&
-	test_must_fail git repack -d 2>err &&
-	test_i18ngrep "Incremental repacks are incompatible with bitmap" err
-'
+	test_expect_success 'pack reuse respects --honor-pack-keep' '
+		test_when_finished "rm -f .git/objects/pack/*.keep" &&
+		for i in .git/objects/pack/*.pack
+		do
+			>${i%.pack}.keep || return 1
+		done &&
+		reusable_pack --honor-pack-keep >empty.pack &&
+		git index-pack empty.pack &&
+		git show-index <empty.idx >actual &&
+		test_must_be_empty actual
+	'
 
-test_expect_success 'incremental repack can disable bitmaps' '
-	test_commit more-2 &&
-	git repack -d --no-write-bitmap-index
-'
+	test_expect_success 'pack reuse respects --local' '
+		mv .git/objects/pack/* alt.git/objects/pack/ &&
+		test_when_finished "mv alt.git/objects/pack/* .git/objects/pack/" &&
+		reusable_pack --local >empty.pack &&
+		git index-pack empty.pack &&
+		git show-index <empty.idx >actual &&
+		test_must_be_empty actual
+	'
 
-test_expect_success 'pack-objects respects --local (non-local loose)' '
-	git init --bare alt.git &&
-	echo $(pwd)/alt.git/objects >.git/objects/info/alternates &&
-	echo content1 >file1 &&
-	# non-local loose object which is not present in bitmapped pack
-	altblob=$(GIT_DIR=alt.git git hash-object -w file1) &&
-	# non-local loose object which is also present in bitmapped pack
-	git cat-file blob $blob | GIT_DIR=alt.git git hash-object -w --stdin &&
-	git add file1 &&
-	test_tick &&
-	git commit -m commit_file1 &&
-	echo HEAD | git pack-objects --local --stdout --revs >1.pack &&
-	git index-pack 1.pack &&
-	list_packed_objects 1.idx >1.objects &&
-	printf "%s\n" "$altblob" "$blob" >nonlocal-loose &&
-	! has_any nonlocal-loose 1.objects
-'
+	test_expect_success 'pack reuse respects --incremental' '
+		reusable_pack --incremental >empty.pack &&
+		git index-pack empty.pack &&
+		git show-index <empty.idx >actual &&
+		test_must_be_empty actual
+	'
 
-test_expect_success 'pack-objects respects --honor-pack-keep (local non-bitmapped pack)' '
-	echo content2 >file2 &&
-	blob2=$(git hash-object -w file2) &&
-	git add file2 &&
-	test_tick &&
-	git commit -m commit_file2 &&
-	printf "%s\n" "$blob2" "$bitmaptip" >keepobjects &&
-	pack2=$(git pack-objects pack2 <keepobjects) &&
-	mv pack2-$pack2.* .git/objects/pack/ &&
-	>.git/objects/pack/pack2-$pack2.keep &&
-	rm $(objpath $blob2) &&
-	echo HEAD | git pack-objects --honor-pack-keep --stdout --revs >2a.pack &&
-	git index-pack 2a.pack &&
-	list_packed_objects 2a.idx >2a.objects &&
-	! has_any keepobjects 2a.objects
-'
+	test_expect_success 'truncated bitmap fails gracefully (ewah)' '
+		test_config pack.writebitmaphashcache false &&
+		test_config pack.writebitmaplookuptable false &&
+		git repack -ad &&
+		git rev-list --use-bitmap-index --count --all >expect &&
+		bitmap=$(ls .git/objects/pack/*.bitmap) &&
+		test_when_finished "rm -f $bitmap" &&
+		test_copy_bytes 256 <$bitmap >$bitmap.tmp &&
+		mv -f $bitmap.tmp $bitmap &&
+		git rev-list --use-bitmap-index --count --all >actual 2>stderr &&
+		test_cmp expect actual &&
+		test_grep corrupt.ewah.bitmap stderr
+	'
 
-test_expect_success 'pack-objects respects --local (non-local pack)' '
-	mv .git/objects/pack/pack2-$pack2.* alt.git/objects/pack/ &&
-	echo HEAD | git pack-objects --local --stdout --revs >2b.pack &&
-	git index-pack 2b.pack &&
-	list_packed_objects 2b.idx >2b.objects &&
-	! has_any keepobjects 2b.objects
-'
+	test_expect_success 'truncated bitmap fails gracefully (cache)' '
+		git config pack.writeBitmapLookupTable '"$writeLookupTable"' &&
+		git repack -ad &&
+		git rev-list --use-bitmap-index --count --all >expect &&
+		bitmap=$(ls .git/objects/pack/*.bitmap) &&
+		test_when_finished "rm -f $bitmap" &&
+		test_copy_bytes 512 <$bitmap >$bitmap.tmp &&
+		mv -f $bitmap.tmp $bitmap &&
+		git rev-list --use-bitmap-index --count --all >actual 2>stderr &&
+		test_cmp expect actual &&
+		test_grep corrupted.bitmap.index stderr
+	'
 
-test_expect_success 'pack-objects respects --honor-pack-keep (local bitmapped pack)' '
-	ls .git/objects/pack/ | grep bitmap >output &&
-	test_line_count = 1 output &&
-	packbitmap=$(basename $(cat output) .bitmap) &&
-	list_packed_objects .git/objects/pack/$packbitmap.idx >packbitmap.objects &&
-	test_when_finished "rm -f .git/objects/pack/$packbitmap.keep" &&
-	>.git/objects/pack/$packbitmap.keep &&
-	echo HEAD | git pack-objects --honor-pack-keep --stdout --revs >3a.pack &&
-	git index-pack 3a.pack &&
-	list_packed_objects 3a.idx >3a.objects &&
-	! has_any packbitmap.objects 3a.objects
-'
+	# Create a state of history with these properties:
+	#
+	#  - refs that allow a client to fetch some new history, while sharing some old
+	#    history with the server; we use branches delta-reuse-old and
+	#    delta-reuse-new here
+	#
+	#  - the new history contains an object that is stored on the server as a delta
+	#    against a base that is in the old history
+	#
+	#  - the base object is not immediately reachable from the tip of the old
+	#    history; finding it would involve digging down through history we know the
+	#    other side has
+	#
+	# This should result in a state where fetching from old->new would not
+	# traditionally reuse the on-disk delta (because we'd have to dig to realize
+	# that the client has it), but we will do so if bitmaps can tell us cheaply
+	# that the other side has it.
+	test_expect_success 'set up thin delta-reuse parent' '
+		# This first commit contains the buried base object.
+		test-tool genrandom delta 16384 >file &&
+		git add file &&
+		git commit -m "delta base" &&
+		base=$(git rev-parse --verify HEAD:file) &&
+
+		# These intermediate commits bury the base back in history.
+		# This becomes the "old" state.
+		for i in 1 2 3 4 5
+		do
+			echo $i >file &&
+			git commit -am "intermediate $i" || return 1
+		done &&
+		git branch delta-reuse-old &&
+
+		# And now our new history has a delta against the buried base. Note
+		# that this must be smaller than the original file, since pack-objects
+		# prefers to create deltas from smaller objects to larger.
+		test-tool genrandom delta 16300 >file &&
+		git commit -am "delta result" &&
+		delta=$(git rev-parse --verify HEAD:file) &&
+		git branch delta-reuse-new &&
+
+		# Repack with bitmaps and double check that we have the expected delta
+		# relationship.
+		git repack -adb &&
+		have_delta $delta $base
+	'
 
-test_expect_success 'pack-objects respects --local (non-local bitmapped pack)' '
-	mv .git/objects/pack/$packbitmap.* alt.git/objects/pack/ &&
-	rm -f .git/objects/pack/multi-pack-index &&
-	test_when_finished "mv alt.git/objects/pack/$packbitmap.* .git/objects/pack/" &&
-	echo HEAD | git pack-objects --local --stdout --revs >3b.pack &&
-	git index-pack 3b.pack &&
-	list_packed_objects 3b.idx >3b.objects &&
-	! has_any packbitmap.objects 3b.objects
-'
+	# Now we can sanity-check the non-bitmap behavior (that the server is not able
+	# to reuse the delta). This isn't strictly something we care about, so this
+	# test could be scrapped in the future. But it makes sure that the next test is
+	# actually triggering the feature we want.
+	#
+	# Note that our tools for working with on-the-wire "thin" packs are limited. So
+	# we actually perform the fetch, retain the resulting pack, and inspect the
+	# result.
+	test_expect_success 'fetch without bitmaps ignores delta against old base' '
+		test_config pack.usebitmaps false &&
+		test_when_finished "rm -rf client.git" &&
+		git init --bare client.git &&
+		(
+			cd client.git &&
+			git config transfer.unpackLimit 1 &&
+			git fetch .. delta-reuse-old:delta-reuse-old &&
+			git fetch .. delta-reuse-new:delta-reuse-new &&
+			have_delta $delta $ZERO_OID
+		)
+	'
 
-test_expect_success 'pack-objects to file can use bitmap' '
-	# make sure we still have 1 bitmap index from previous tests
-	ls .git/objects/pack/ | grep bitmap >output &&
-	test_line_count = 1 output &&
-	# verify equivalent packs are generated with/without using bitmap index
-	packasha1=$(git pack-objects --no-use-bitmap-index --all packa </dev/null) &&
-	packbsha1=$(git pack-objects --use-bitmap-index --all packb </dev/null) &&
-	list_packed_objects packa-$packasha1.idx >packa.objects &&
-	list_packed_objects packb-$packbsha1.idx >packb.objects &&
-	test_cmp packa.objects packb.objects
-'
+	# And do the same for the bitmap case, where we do expect to find the delta.
+	test_expect_success 'fetch with bitmaps can reuse old base' '
+		test_config pack.usebitmaps true &&
+		test_when_finished "rm -rf client.git" &&
+		git init --bare client.git &&
+		(
+			cd client.git &&
+			git config transfer.unpackLimit 1 &&
+			git fetch .. delta-reuse-old:delta-reuse-old &&
+			git fetch .. delta-reuse-new:delta-reuse-new &&
+			have_delta $delta $base
+		)
+	'
 
-test_expect_success 'full repack, reusing previous bitmaps' '
-	git repack -ad &&
-	ls .git/objects/pack/ | grep bitmap >output &&
-	test_line_count = 1 output
-'
+	test_expect_success 'pack.preferBitmapTips' '
+		git init repo &&
+		test_when_finished "rm -fr repo" &&
+		(
+			cd repo &&
+			git config pack.writeBitmapLookupTable '"$writeLookupTable"' &&
 
-test_expect_success 'fetch (full bitmap)' '
-	git --git-dir=clone.git fetch origin master:master &&
-	git rev-parse HEAD >expect &&
-	git --git-dir=clone.git rev-parse HEAD >actual &&
-	test_cmp expect actual
-'
+			# create enough commits that not all are receive bitmap
+			# coverage even if they are all at the tip of some reference.
+			test_commit_bulk --message="%s" 103 &&
 
-test_expect_success 'create objects for missing-HAVE tests' '
-	blob=$(echo "missing have" | git hash-object -w --stdin) &&
-	tree=$(printf "100644 blob $blob\tfile\n" | git mktree) &&
-	parent=$(echo parent | git commit-tree $tree) &&
-	commit=$(echo commit | git commit-tree $tree -p $parent) &&
-	cat >revs <<-EOF
-	HEAD
-	^HEAD^
-	^$commit
-	EOF
-'
+			git rev-list HEAD >commits.raw &&
+			sort <commits.raw >commits &&
 
-test_expect_success 'pack-objects respects --incremental' '
-	cat >revs2 <<-EOF &&
-	HEAD
-	$commit
-	EOF
-	git pack-objects --incremental --stdout --revs <revs2 >4.pack &&
-	git index-pack 4.pack &&
-	list_packed_objects 4.idx >4.objects &&
-	test_line_count = 4 4.objects &&
-	git rev-list --objects $commit >revlist &&
-	cut -d" " -f1 revlist |sort >objects &&
-	test_cmp 4.objects objects
-'
+			git log --format="create refs/tags/%s %H" HEAD >refs &&
+			git update-ref --stdin <refs &&
 
-test_expect_success 'pack with missing blob' '
-	rm $(objpath $blob) &&
-	git pack-objects --stdout --revs <revs >/dev/null
-'
+			git repack -adb &&
+			test-tool bitmap list-commits | sort >bitmaps &&
 
-test_expect_success 'pack with missing tree' '
-	rm $(objpath $tree) &&
-	git pack-objects --stdout --revs <revs >/dev/null
-'
+			# remember which commits did not receive bitmaps
+			comm -13 bitmaps commits >before &&
+			test_file_not_empty before &&
 
-test_expect_success 'pack with missing parent' '
-	rm $(objpath $parent) &&
-	git pack-objects --stdout --revs <revs >/dev/null
-'
+			# mark the commits which did not receive bitmaps as preferred,
+			# and generate the bitmap again
+			perl -pe "s{^}{create refs/tags/include/$. }" <before |
+				git update-ref --stdin &&
+			git -c pack.preferBitmapTips=refs/tags/include repack -adb &&
 
-test_expect_success JGIT 'we can read jgit bitmaps' '
-	git clone --bare . compat-jgit.git &&
-	(
-		cd compat-jgit.git &&
-		rm -f objects/pack/*.bitmap &&
-		jgit gc &&
-		git rev-list --test-bitmap HEAD
-	)
-'
+			# finally, check that the commit(s) without bitmap coverage
+			# are not the same ones as before
+			test-tool bitmap list-commits | sort >bitmaps &&
+			comm -13 bitmaps commits >after &&
 
-test_expect_success JGIT 'jgit can read our bitmaps' '
-	git clone --bare . compat-us.git &&
-	(
-		cd compat-us.git &&
-		git repack -adb &&
-		# jgit gc will barf if it does not like our bitmaps
-		jgit gc
-	)
-'
+			! test_cmp before after
+		)
+	'
+
+	test_expect_success 'pack.preferBitmapTips' '
+		git init repo &&
+		test_when_finished "rm -rf repo" &&
+		(
+			cd repo &&
+			git config pack.writeBitmapLookupTable '"$writeLookupTable"' &&
+			test_commit_bulk --message="%s" 103 &&
+
+			cat >>.git/config <<-\EOF &&
+			[pack]
+				preferBitmapTips
+			EOF
+			cat >expect <<-\EOF &&
+			error: missing value for '\''pack.preferbitmaptips'\''
+			EOF
+			git repack -adb 2>actual &&
+			test_cmp expect actual
+		)
+	'
+
+	test_expect_success 'complains about multiple pack bitmaps' '
+		rm -fr repo &&
+		git init repo &&
+		test_when_finished "rm -fr repo" &&
+		(
+			cd repo &&
+			git config pack.writeBitmapLookupTable '"$writeLookupTable"' &&
+
+			test_commit base &&
+
+			git repack -adb &&
+			bitmap="$(ls .git/objects/pack/pack-*.bitmap)" &&
+			mv "$bitmap" "$bitmap.bak" &&
+
+			test_commit other &&
+			git repack -ab &&
+
+			mv "$bitmap.bak" "$bitmap" &&
+
+			find .git/objects/pack -type f -name "*.pack" >packs &&
+			find .git/objects/pack -type f -name "*.bitmap" >bitmaps &&
+			test_line_count = 2 packs &&
+			test_line_count = 2 bitmaps &&
+
+			GIT_TRACE2_EVENT=$(pwd)/trace2.txt git rev-list --use-bitmap-index HEAD &&
+			grep "opened bitmap" trace2.txt &&
+			grep "ignoring extra bitmap" trace2.txt
+		)
+	'
+}
+
+test_bitmap_cases
+
+GIT_TEST_PACK_USE_BITMAP_BOUNDARY_TRAVERSAL=1
+export GIT_TEST_PACK_USE_BITMAP_BOUNDARY_TRAVERSAL
 
-test_expect_success 'splitting packs does not generate bogus bitmaps' '
-	test-tool genrandom foo $((1024 * 1024)) >rand &&
-	git add rand &&
-	git commit -m "commit with big file" &&
-	git -c pack.packSizeLimit=500k repack -adb &&
-	git init --bare no-bitmaps.git &&
-	git -C no-bitmaps.git fetch .. HEAD
+test_bitmap_cases
+
+sane_unset GIT_TEST_PACK_USE_BITMAP_BOUNDARY_TRAVERSAL
+
+test_expect_success 'incremental repack fails when bitmaps are requested' '
+	test_commit more-1 &&
+	test_must_fail git repack -d 2>err &&
+	test_grep "Incremental repacks are incompatible with bitmap" err
 '
 
-test_expect_success 'set up reusable pack' '
-	rm -f .git/objects/pack/*.keep &&
-	git repack -adb &&
-	reusable_pack () {
-		git for-each-ref --format="%(objectname)" |
-		git pack-objects --delta-base-offset --revs --stdout "$@"
-	}
+test_expect_success 'incremental repack can disable bitmaps' '
+	test_commit more-2 &&
+	git repack -d --no-write-bitmap-index
 '
 
-test_expect_success 'pack reuse respects --honor-pack-keep' '
-	test_when_finished "rm -f .git/objects/pack/*.keep" &&
-	for i in .git/objects/pack/*.pack
+test_expect_success 'boundary-based traversal is used when requested' '
+	git repack -a -d --write-bitmap-index &&
+
+	for argv in \
+		"git -c pack.useBitmapBoundaryTraversal=true" \
+		"git -c feature.experimental=true" \
+		"GIT_TEST_PACK_USE_BITMAP_BOUNDARY_TRAVERSAL=1 git"
 	do
-		>${i%.pack}.keep
+		eval "GIT_TRACE2_EVENT=1 $argv rev-list --objects \
+			--use-bitmap-index second..other 2>perf" &&
+		grep "\"region_enter\".*\"label\":\"haves/boundary\"" perf ||
+			return 1
 	done &&
-	reusable_pack --honor-pack-keep >empty.pack &&
-	git index-pack empty.pack &&
-	git show-index <empty.idx >actual &&
-	test_must_be_empty actual
-'
 
-test_expect_success 'pack reuse respects --local' '
-	mv .git/objects/pack/* alt.git/objects/pack/ &&
-	test_when_finished "mv alt.git/objects/pack/* .git/objects/pack/" &&
-	reusable_pack --local >empty.pack &&
-	git index-pack empty.pack &&
-	git show-index <empty.idx >actual &&
-	test_must_be_empty actual
+	for argv in \
+		"git -c pack.useBitmapBoundaryTraversal=false" \
+		"git -c feature.experimental=true -c pack.useBitmapBoundaryTraversal=false" \
+		"GIT_TEST_PACK_USE_BITMAP_BOUNDARY_TRAVERSAL=0 git -c pack.useBitmapBoundaryTraversal=true" \
+		"GIT_TEST_PACK_USE_BITMAP_BOUNDARY_TRAVERSAL=0 git -c feature.experimental=true"
+	do
+		eval "GIT_TRACE2_EVENT=1 $argv rev-list --objects \
+			--use-bitmap-index second..other 2>perf" &&
+		grep "\"region_enter\".*\"label\":\"haves/classic\"" perf ||
+			return 1
+	done
 '
 
-test_expect_success 'pack reuse respects --incremental' '
-	reusable_pack --incremental >empty.pack &&
-	git index-pack empty.pack &&
-	git show-index <empty.idx >actual &&
-	test_must_be_empty actual
+test_bitmap_cases "pack.writeBitmapLookupTable"
+
+test_expect_success 'verify writing bitmap lookup table when enabled' '
+	GIT_TRACE2_EVENT="$(pwd)/trace2" \
+		git repack -ad &&
+	grep "\"label\":\"writing_lookup_table\"" trace2
 '
 
-test_expect_success 'truncated bitmap fails gracefully' '
-	git repack -ad &&
+test_expect_success 'truncated bitmap fails gracefully (lookup table)' '
+	test_config pack.writebitmaphashcache false &&
+	git repack -adb &&
 	git rev-list --use-bitmap-index --count --all >expect &&
 	bitmap=$(ls .git/objects/pack/*.bitmap) &&
 	test_when_finished "rm -f $bitmap" &&
@@ -352,100 +524,7 @@ test_expect_success 'truncated bitmap fails gracefully' '
 	mv -f $bitmap.tmp $bitmap &&
 	git rev-list --use-bitmap-index --count --all >actual 2>stderr &&
 	test_cmp expect actual &&
-	test_i18ngrep corrupt stderr
-'
-
-# have_delta <obj> <expected_base>
-#
-# Note that because this relies on cat-file, it might find _any_ copy of an
-# object in the repository. The caller is responsible for making sure
-# there's only one (e.g., via "repack -ad", or having just fetched a copy).
-have_delta () {
-	echo $2 >expect &&
-	echo $1 | git cat-file --batch-check="%(deltabase)" >actual &&
-	test_cmp expect actual
-}
-
-# Create a state of history with these properties:
-#
-#  - refs that allow a client to fetch some new history, while sharing some old
-#    history with the server; we use branches delta-reuse-old and
-#    delta-reuse-new here
-#
-#  - the new history contains an object that is stored on the server as a delta
-#    against a base that is in the old history
-#
-#  - the base object is not immediately reachable from the tip of the old
-#    history; finding it would involve digging down through history we know the
-#    other side has
-#
-# This should result in a state where fetching from old->new would not
-# traditionally reuse the on-disk delta (because we'd have to dig to realize
-# that the client has it), but we will do so if bitmaps can tell us cheaply
-# that the other side has it.
-test_expect_success 'set up thin delta-reuse parent' '
-	# This first commit contains the buried base object.
-	test-tool genrandom delta 16384 >file &&
-	git add file &&
-	git commit -m "delta base" &&
-	base=$(git rev-parse --verify HEAD:file) &&
-
-	# These intermediate commits bury the base back in history.
-	# This becomes the "old" state.
-	for i in 1 2 3 4 5
-	do
-		echo $i >file &&
-		git commit -am "intermediate $i" || return 1
-	done &&
-	git branch delta-reuse-old &&
-
-	# And now our new history has a delta against the buried base. Note
-	# that this must be smaller than the original file, since pack-objects
-	# prefers to create deltas from smaller objects to larger.
-	test-tool genrandom delta 16300 >file &&
-	git commit -am "delta result" &&
-	delta=$(git rev-parse --verify HEAD:file) &&
-	git branch delta-reuse-new &&
-
-	# Repack with bitmaps and double check that we have the expected delta
-	# relationship.
-	git repack -adb &&
-	have_delta $delta $base
-'
-
-# Now we can sanity-check the non-bitmap behavior (that the server is not able
-# to reuse the delta). This isn't strictly something we care about, so this
-# test could be scrapped in the future. But it makes sure that the next test is
-# actually triggering the feature we want.
-#
-# Note that our tools for working with on-the-wire "thin" packs are limited. So
-# we actually perform the fetch, retain the resulting pack, and inspect the
-# result.
-test_expect_success 'fetch without bitmaps ignores delta against old base' '
-	test_config pack.usebitmaps false &&
-	test_when_finished "rm -rf client.git" &&
-	git init --bare client.git &&
-	(
-		cd client.git &&
-		git config transfer.unpackLimit 1 &&
-		git fetch .. delta-reuse-old:delta-reuse-old &&
-		git fetch .. delta-reuse-new:delta-reuse-new &&
-		have_delta $delta $ZERO_OID
-	)
-'
-
-# And do the same for the bitmap case, where we do expect to find the delta.
-test_expect_success 'fetch with bitmaps can reuse old base' '
-	test_config pack.usebitmaps true &&
-	test_when_finished "rm -rf client.git" &&
-	git init --bare client.git &&
-	(
-		cd client.git &&
-		git config transfer.unpackLimit 1 &&
-		git fetch .. delta-reuse-old:delta-reuse-old &&
-		git fetch .. delta-reuse-new:delta-reuse-new &&
-		have_delta $delta $base
-	)
+	test_grep corrupted.bitmap.index stderr
 '
 
 test_done
diff --git a/t/t5311-pack-bitmaps-shallow.sh b/t/t5311-pack-bitmaps-shallow.sh
index 872a95d..4fe71fe 100755
--- a/t/t5311-pack-bitmaps-shallow.sh
+++ b/t/t5311-pack-bitmaps-shallow.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='check bitmap operation with shallow repositories'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # We want to create a situation where the shallow, grafted
@@ -17,23 +19,40 @@ test_description='check bitmap operation with shallow repositories'
 # the tree for A. But in a shallow one, we've grafted away
 # A, and fetching A to B requires that the other side send
 # us the tree for file=1.
-test_expect_success 'setup shallow repo' '
-	echo 1 >file &&
-	git add file &&
-	git commit -m orig &&
-	echo 2 >file &&
-	git commit -a -m update &&
-	git clone --no-local --bare --depth=1 . shallow.git &&
-	echo 1 >file &&
-	git commit -a -m repeat
-'
-
-test_expect_success 'turn on bitmaps in the parent' '
-	git repack -adb
-'
-
-test_expect_success 'shallow fetch from bitmapped repo' '
-	(cd shallow.git && git fetch)
-'
+test_shallow_bitmaps () {
+	writeLookupTable=false
+
+	for i in "$@"
+	do
+		case $i in
+		"pack.writeBitmapLookupTable") writeLookupTable=true;;
+		esac
+	done
+
+	test_expect_success 'setup shallow repo' '
+		rm -rf * .git &&
+		git init &&
+		git config pack.writeBitmapLookupTable '"$writeLookupTable"' &&
+		echo 1 >file &&
+		git add file &&
+		git commit -m orig &&
+		echo 2 >file &&
+		git commit -a -m update &&
+		git clone --no-local --bare --depth=1 . shallow.git &&
+		echo 1 >file &&
+		git commit -a -m repeat
+	'
+
+	test_expect_success 'turn on bitmaps in the parent' '
+		git repack -adb
+	'
+
+	test_expect_success 'shallow fetch from bitmapped repo' '
+		(cd shallow.git && git fetch)
+	'
+}
+
+test_shallow_bitmaps
+test_shallow_bitmaps "pack.writeBitmapLookupTable"
 
 test_done
diff --git a/t/t5312-prune-corruption.sh b/t/t5312-prune-corruption.sh
index da9d599..d8d2e30 100755
--- a/t/t5312-prune-corruption.sh
+++ b/t/t5312-prune-corruption.sh
@@ -7,7 +7,14 @@ if we see, for example, a ref with a bogus name, it is OK either to
 bail out or to proceed using it as a reachable tip, but it is _not_
 OK to proceed as if it did not exist. Otherwise we might silently
 delete objects that cannot be recovered.
+
+Note that we do assert command failure in these cases, because that is
+what currently happens. If that changes, these tests should be revisited.
 '
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'disable reflogs' '
@@ -15,43 +22,62 @@ test_expect_success 'disable reflogs' '
 	git reflog expire --expire=all --all
 '
 
+create_bogus_ref () {
+	test-tool ref-store main update-ref msg "refs/heads/bogus..name" $bogus $ZERO_OID REF_SKIP_REFNAME_VERIFICATION &&
+	test_when_finished "test-tool ref-store main delete-refs REF_NO_DEREF msg refs/heads/bogus..name"
+}
+
 test_expect_success 'create history reachable only from a bogus-named ref' '
-	test_tick && git commit --allow-empty -m master &&
+	test_tick && git commit --allow-empty -m main &&
 	base=$(git rev-parse HEAD) &&
 	test_tick && git commit --allow-empty -m bogus &&
 	bogus=$(git rev-parse HEAD) &&
 	git cat-file commit $bogus >saved &&
-	echo $bogus >.git/refs/heads/bogus..name &&
 	git reset --hard HEAD^
 '
 
 test_expect_success 'pruning does not drop bogus object' '
 	test_when_finished "git hash-object -w -t commit saved" &&
-	test_might_fail git prune --expire=now &&
-	verbose git cat-file -e $bogus
+	create_bogus_ref &&
+	test_must_fail git prune --expire=now &&
+	git cat-file -e $bogus
 '
 
 test_expect_success 'put bogus object into pack' '
 	git tag reachable $bogus &&
 	git repack -ad &&
 	git tag -d reachable &&
-	verbose git cat-file -e $bogus
+	git cat-file -e $bogus
+'
+
+test_expect_success 'non-destructive repack bails on bogus ref' '
+	create_bogus_ref &&
+	test_must_fail git repack -adk
 '
 
+test_expect_success 'GIT_REF_PARANOIA=0 overrides safety' '
+	create_bogus_ref &&
+	GIT_REF_PARANOIA=0 git repack -adk
+'
+
+
 test_expect_success 'destructive repack keeps packed object' '
-	test_might_fail git repack -Ad --unpack-unreachable=now &&
-	verbose git cat-file -e $bogus &&
-	test_might_fail git repack -ad &&
-	verbose git cat-file -e $bogus
+	create_bogus_ref &&
+	test_must_fail git repack -Ad --unpack-unreachable=now &&
+	git cat-file -e $bogus &&
+	test_must_fail git repack -ad &&
+	git cat-file -e $bogus
 '
 
-# subsequent tests will have different corruptions
-test_expect_success 'clean up bogus ref' '
-	rm .git/refs/heads/bogus..name
+test_expect_success 'destructive repack not confused by dangling symref' '
+	test_when_finished "git symbolic-ref -d refs/heads/dangling" &&
+	git symbolic-ref refs/heads/dangling refs/heads/does-not-exist &&
+	git repack -ad &&
+	test_must_fail git cat-file -e $bogus
 '
 
 # We create two new objects here, "one" and "two". Our
-# master branch points to "two", which is deleted,
+# main branch points to "two", which is deleted,
 # corrupting the repository. But we'd like to make sure
 # that the otherwise unreachable "one" is not pruned
 # (since it is the user's best bet for recovering
@@ -74,40 +100,14 @@ test_expect_success 'create history with missing tip commit' '
 
 test_expect_success 'pruning with a corrupted tip does not drop history' '
 	test_when_finished "git hash-object -w -t commit saved" &&
-	test_might_fail git prune --expire=now &&
-	verbose git cat-file -e $recoverable
+	test_must_fail git prune --expire=now &&
+	git cat-file -e $recoverable
 '
 
 test_expect_success 'pack-refs does not silently delete broken loose ref' '
 	git pack-refs --all --prune &&
 	echo $missing >expect &&
-	git rev-parse refs/heads/master >actual &&
-	test_cmp expect actual
-'
-
-# we do not want to count on running pack-refs to
-# actually pack it, as it is perfectly reasonable to
-# skip processing a broken ref
-test_expect_success 'create packed-refs file with broken ref' '
-	rm -f .git/refs/heads/master &&
-	cat >.git/packed-refs <<-EOF &&
-	$missing refs/heads/master
-	$recoverable refs/heads/other
-	EOF
-	echo $missing >expect &&
-	git rev-parse refs/heads/master >actual &&
-	test_cmp expect actual
-'
-
-test_expect_success 'pack-refs does not silently delete broken packed ref' '
-	git pack-refs --all --prune &&
-	git rev-parse refs/heads/master >actual &&
-	test_cmp expect actual
-'
-
-test_expect_success 'pack-refs does not drop broken refs during deletion' '
-	git update-ref -d refs/heads/other &&
-	git rev-parse refs/heads/master >actual &&
+	git rev-parse refs/heads/main >actual &&
 	test_cmp expect actual
 '
 
diff --git a/t/t5313-pack-bounds-checks.sh b/t/t5313-pack-bounds-checks.sh
index 535313e..ceaa670 100755
--- a/t/t5313-pack-bounds-checks.sh
+++ b/t/t5313-pack-bounds-checks.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='bounds-checking of access to mmapped on-disk file formats'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 clear_base () {
@@ -57,7 +59,7 @@ test_expect_success 'setup' '
 test_expect_success 'set up base packfile and variables' '
 	# the hash of this content starts with ff, which
 	# makes some later computations much simpler
-	echo $(test_oid oidfff) >file &&
+	test_oid oidfff >file &&
 	git add file &&
 	git commit -m base &&
 	git repack -ad &&
diff --git a/t/t5314-pack-cycle-detection.sh b/t/t5314-pack-cycle-detection.sh
index 0aec861..82734b9 100755
--- a/t/t5314-pack-cycle-detection.sh
+++ b/t/t5314-pack-cycle-detection.sh
@@ -49,9 +49,9 @@ Then no matter which order we start looking at the packs in, we know that we
 will always find a delta for "file", because its lookup will always come
 immediately after the lookup for "dummy".
 '
-. ./test-lib.sh
-
 
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
 
 # Create a pack containing the tree $1 and blob $1:file, with
 # the latter stored as a delta against $2:file.
@@ -63,13 +63,16 @@ immediately after the lookup for "dummy".
 # Note that the two variants of "file" must be similar enough to convince git
 # to create the delta.
 make_pack () {
-	{
-		printf '%s\n' "-$(git rev-parse $2)"
-		printf '%s dummy\n' "$(git rev-parse $1:dummy)"
-		printf '%s file\n' "$(git rev-parse $1:file)"
-	} |
-	git pack-objects --stdout |
-	git index-pack --stdin --fix-thin
+	ln1=$(git rev-parse "$2") &&
+	ln2=$(git rev-parse "$1:dummy") &&
+	ln3=$(git rev-parse "$1:file") &&
+	cat >list <<-EOF
+	-$ln1
+	$ln2 dummy
+	$ln3 file
+	EOF
+	git pack-objects --stdout <list >pack &&
+	git index-pack --stdin --fix-thin <pack
 }
 
 test_expect_success 'setup' '
diff --git a/t/t5315-pack-objects-compression.sh b/t/t5315-pack-objects-compression.sh
index df970d7..c80ea9e 100755
--- a/t/t5315-pack-objects-compression.sh
+++ b/t/t5315-pack-objects-compression.sh
@@ -2,14 +2,9 @@
 
 test_description='pack-object compression configuration'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
-# This should be moved to test-lib.sh together with the
-# copy in t0021 after both topics have graduated to 'master'.
-file_size () {
-	test-tool path-utils file-size "$1"
-}
-
 test_expect_success setup '
 	printf "%2000000s" X |
 	git hash-object -w --stdin >object-name &&
@@ -24,7 +19,7 @@ do
 	test_expect_success "pack-objects with $config" '
 		test_when_finished "rm -f pack-*.*" &&
 		git $config pack-objects pack <object-name &&
-		sz=$(file_size pack-*.pack) &&
+		sz=$(test_file_size pack-*.pack) &&
 		case "$expect" in
 		small) test "$sz" -le 100000 ;;
 		large) test "$sz" -ge 100000 ;;
diff --git a/t/t5316-pack-delta-depth.sh b/t/t5316-pack-delta-depth.sh
index 0f06c40..eb4ef3d 100755
--- a/t/t5316-pack-delta-depth.sh
+++ b/t/t5316-pack-delta-depth.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='pack-objects breaks long cross-pack delta chains'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # This mirrors a repeated push setup:
@@ -57,11 +59,18 @@ test_expect_success 'create series of packs' '
 		git commit -m $i &&
 		cur=$(git rev-parse HEAD^{tree}) &&
 		{
-			test -n "$prev" && echo "-$prev"
-			echo $cur
+			if test -n "$prev"
+			then
+				echo "-$prev"
+			fi &&
+			echo $cur &&
 			echo "$(git rev-parse :file) file"
 		} | git pack-objects --stdout >tmp &&
-		git index-pack --stdin --fix-thin <tmp || return 1
+		GIT_TRACE2_EVENT=$PWD/trace \
+		git index-pack -v --stdin --fix-thin <tmp || return 1 &&
+		grep -c region_enter.*progress trace >enter &&
+		grep -c region_leave.*progress trace >leave &&
+		test_cmp enter leave &&
 		prev=$cur
 	done
 '
@@ -69,6 +78,7 @@ test_expect_success 'create series of packs' '
 max_chain() {
 	git index-pack --verify-stat-only "$1" >output &&
 	perl -lne '
+	  BEGIN { $len = 0 }
 	  /chain length = (\d+)/ and $len = $1;
 	  END { print $len }
 	' output
@@ -84,14 +94,28 @@ test_expect_success 'packing produces a long delta' '
 	pack=$(git pack-objects --all --window=0 </dev/null pack) &&
 	echo 9 >expect &&
 	max_chain pack-$pack.pack >actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 test_expect_success '--depth limits depth' '
 	pack=$(git pack-objects --all --depth=5 </dev/null pack) &&
 	echo 5 >expect &&
 	max_chain pack-$pack.pack >actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
+'
+
+test_expect_success '--depth=0 disables deltas' '
+	pack=$(git pack-objects --all --depth=0 </dev/null pack) &&
+	echo 0 >expect &&
+	max_chain pack-$pack.pack >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'negative depth disables deltas' '
+	pack=$(git pack-objects --all --depth=-1 </dev/null pack) &&
+	echo 0 >expect &&
+	max_chain pack-$pack.pack >actual &&
+	test_cmp expect actual
 '
 
 test_done
diff --git a/t/t5317-pack-objects-filter-objects.sh b/t/t5317-pack-objects-filter-objects.sh
index dc04465..79552d6 100755
--- a/t/t5317-pack-objects-filter-objects.sh
+++ b/t/t5317-pack-objects-filter-objects.sh
@@ -2,27 +2,32 @@
 
 test_description='git pack-objects using object filtering'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # Test blob:none filter.
 
 test_expect_success 'setup r1' '
-	echo "{print \$1}" >print_1.awk &&
-	echo "{print \$2}" >print_2.awk &&
-
 	git init r1 &&
 	for n in 1 2 3 4 5
 	do
-		echo "This is file: $n" > r1/file.$n
-		git -C r1 add file.$n
-		git -C r1 commit -m "$n"
+		echo "This is file: $n" > r1/file.$n &&
+		git -C r1 add file.$n &&
+		git -C r1 commit -m "$n" || return 1
 	done
 '
 
+parse_verify_pack_blob_oid () {
+	awk '{print $1}' -
+}
+
 test_expect_success 'verify blob count in normal packfile' '
 	git -C r1 ls-files -s file.1 file.2 file.3 file.4 file.5 \
 		>ls_files_result &&
-	awk -f print_2.awk ls_files_result |
+	test_parse_ls_files_stage_oids <ls_files_result |
 	sort >expected &&
 
 	git -C r1 pack-objects --revs --stdout >all.pack <<-EOF &&
@@ -32,7 +37,7 @@ test_expect_success 'verify blob count in normal packfile' '
 
 	git -C r1 verify-pack -v ../all.pack >verify_result &&
 	grep blob verify_result |
-	awk -f print_1.awk |
+	parse_verify_pack_blob_oid |
 	sort >observed &&
 
 	test_cmp expected observed
@@ -48,15 +53,23 @@ test_expect_success 'verify blob:none packfile has no blobs' '
 	! grep blob verify_result
 '
 
+test_expect_success 'verify blob:none packfile without --stdout' '
+	git -C r1 pack-objects --revs --filter=blob:none mypackname >packhash <<-EOF &&
+	HEAD
+	EOF
+	git -C r1 verify-pack -v "mypackname-$(cat packhash).pack" >verify_result &&
+	! grep blob verify_result
+'
+
 test_expect_success 'verify normal and blob:none packfiles have same commits/trees' '
 	git -C r1 verify-pack -v ../all.pack >verify_result &&
 	grep -E "commit|tree" verify_result |
-	awk -f print_1.awk |
+	parse_verify_pack_blob_oid |
 	sort >expected &&
 
 	git -C r1 verify-pack -v ../filter.pack >verify_result &&
 	grep -E "commit|tree" verify_result |
-	awk -f print_1.awk |
+	parse_verify_pack_blob_oid |
 	sort >observed &&
 
 	test_cmp expected observed
@@ -113,15 +126,15 @@ test_expect_success 'setup r2' '
 	git init r2 &&
 	for n in 1000 10000
 	do
-		printf "%"$n"s" X > r2/large.$n
-		git -C r2 add large.$n
-		git -C r2 commit -m "$n"
+		printf "%"$n"s" X > r2/large.$n &&
+		git -C r2 add large.$n &&
+		git -C r2 commit -m "$n" || return 1
 	done
 '
 
 test_expect_success 'verify blob count in normal packfile' '
 	git -C r2 ls-files -s large.1000 large.10000 >ls_files_result &&
-	awk -f print_2.awk ls_files_result |
+	test_parse_ls_files_stage_oids <ls_files_result |
 	sort >expected &&
 
 	git -C r2 pack-objects --revs --stdout >all.pack <<-EOF &&
@@ -131,7 +144,7 @@ test_expect_success 'verify blob count in normal packfile' '
 
 	git -C r2 verify-pack -v ../all.pack >verify_result &&
 	grep blob verify_result |
-	awk -f print_1.awk |
+	parse_verify_pack_blob_oid |
 	sort >observed &&
 
 	test_cmp expected observed
@@ -159,7 +172,7 @@ test_expect_success 'verify blob:limit=1000' '
 
 test_expect_success 'verify blob:limit=1001' '
 	git -C r2 ls-files -s large.1000 >ls_files_result &&
-	awk -f print_2.awk ls_files_result |
+	test_parse_ls_files_stage_oids <ls_files_result |
 	sort >expected &&
 
 	git -C r2 pack-objects --revs --stdout --filter=blob:limit=1001 >filter.pack <<-EOF &&
@@ -169,7 +182,7 @@ test_expect_success 'verify blob:limit=1001' '
 
 	git -C r2 verify-pack -v ../filter.pack >verify_result &&
 	grep blob verify_result |
-	awk -f print_1.awk |
+	parse_verify_pack_blob_oid |
 	sort >observed &&
 
 	test_cmp expected observed
@@ -177,7 +190,7 @@ test_expect_success 'verify blob:limit=1001' '
 
 test_expect_success 'verify blob:limit=10001' '
 	git -C r2 ls-files -s large.1000 large.10000 >ls_files_result &&
-	awk -f print_2.awk ls_files_result |
+	test_parse_ls_files_stage_oids <ls_files_result |
 	sort >expected &&
 
 	git -C r2 pack-objects --revs --stdout --filter=blob:limit=10001 >filter.pack <<-EOF &&
@@ -187,7 +200,7 @@ test_expect_success 'verify blob:limit=10001' '
 
 	git -C r2 verify-pack -v ../filter.pack >verify_result &&
 	grep blob verify_result |
-	awk -f print_1.awk |
+	parse_verify_pack_blob_oid |
 	sort >observed &&
 
 	test_cmp expected observed
@@ -195,7 +208,7 @@ test_expect_success 'verify blob:limit=10001' '
 
 test_expect_success 'verify blob:limit=1k' '
 	git -C r2 ls-files -s large.1000 >ls_files_result &&
-	awk -f print_2.awk ls_files_result |
+	test_parse_ls_files_stage_oids <ls_files_result |
 	sort >expected &&
 
 	git -C r2 pack-objects --revs --stdout --filter=blob:limit=1k >filter.pack <<-EOF &&
@@ -205,7 +218,7 @@ test_expect_success 'verify blob:limit=1k' '
 
 	git -C r2 verify-pack -v ../filter.pack >verify_result &&
 	grep blob verify_result |
-	awk -f print_1.awk |
+	parse_verify_pack_blob_oid |
 	sort >observed &&
 
 	test_cmp expected observed
@@ -213,7 +226,7 @@ test_expect_success 'verify blob:limit=1k' '
 
 test_expect_success 'verify explicitly specifying oversized blob in input' '
 	git -C r2 ls-files -s large.1000 large.10000 >ls_files_result &&
-	awk -f print_2.awk ls_files_result |
+	test_parse_ls_files_stage_oids <ls_files_result |
 	sort >expected &&
 
 	echo HEAD >objects &&
@@ -223,7 +236,7 @@ test_expect_success 'verify explicitly specifying oversized blob in input' '
 
 	git -C r2 verify-pack -v ../filter.pack >verify_result &&
 	grep blob verify_result |
-	awk -f print_1.awk |
+	parse_verify_pack_blob_oid |
 	sort >observed &&
 
 	test_cmp expected observed
@@ -231,7 +244,7 @@ test_expect_success 'verify explicitly specifying oversized blob in input' '
 
 test_expect_success 'verify blob:limit=1m' '
 	git -C r2 ls-files -s large.1000 large.10000 >ls_files_result &&
-	awk -f print_2.awk ls_files_result |
+	test_parse_ls_files_stage_oids <ls_files_result |
 	sort >expected &&
 
 	git -C r2 pack-objects --revs --stdout --filter=blob:limit=1m >filter.pack <<-EOF &&
@@ -241,7 +254,7 @@ test_expect_success 'verify blob:limit=1m' '
 
 	git -C r2 verify-pack -v ../filter.pack >verify_result &&
 	grep blob verify_result |
-	awk -f print_1.awk |
+	parse_verify_pack_blob_oid |
 	sort >observed &&
 
 	test_cmp expected observed
@@ -250,12 +263,50 @@ test_expect_success 'verify blob:limit=1m' '
 test_expect_success 'verify normal and blob:limit packfiles have same commits/trees' '
 	git -C r2 verify-pack -v ../all.pack >verify_result &&
 	grep -E "commit|tree" verify_result |
-	awk -f print_1.awk |
+	parse_verify_pack_blob_oid |
 	sort >expected &&
 
 	git -C r2 verify-pack -v ../filter.pack >verify_result &&
 	grep -E "commit|tree" verify_result |
-	awk -f print_1.awk |
+	parse_verify_pack_blob_oid |
+	sort >observed &&
+
+	test_cmp expected observed
+'
+
+test_expect_success 'verify small limit and big limit results in small limit' '
+	git -C r2 ls-files -s large.1000 >ls_files_result &&
+	test_parse_ls_files_stage_oids <ls_files_result |
+	sort >expected &&
+
+	git -C r2 pack-objects --revs --stdout --filter=blob:limit=1001 \
+		--filter=blob:limit=10001 >filter.pack <<-EOF &&
+	HEAD
+	EOF
+	git -C r2 index-pack ../filter.pack &&
+
+	git -C r2 verify-pack -v ../filter.pack >verify_result &&
+	grep blob verify_result |
+	parse_verify_pack_blob_oid |
+	sort >observed &&
+
+	test_cmp expected observed
+'
+
+test_expect_success 'verify big limit and small limit results in small limit' '
+	git -C r2 ls-files -s large.1000 >ls_files_result &&
+	test_parse_ls_files_stage_oids <ls_files_result |
+	sort >expected &&
+
+	git -C r2 pack-objects --revs --stdout --filter=blob:limit=10001 \
+		--filter=blob:limit=1001 >filter.pack <<-EOF &&
+	HEAD
+	EOF
+	git -C r2 index-pack ../filter.pack &&
+
+	git -C r2 verify-pack -v ../filter.pack >verify_result &&
+	grep blob verify_result |
+	parse_verify_pack_blob_oid |
 	sort >observed &&
 
 	test_cmp expected observed
@@ -275,10 +326,10 @@ test_expect_success 'setup r3' '
 	mkdir r3/dir1 &&
 	for n in sparse1 sparse2
 	do
-		echo "This is file: $n" > r3/$n
-		git -C r3 add $n
-		echo "This is file: dir1/$n" > r3/dir1/$n
-		git -C r3 add dir1/$n
+		echo "This is file: $n" > r3/$n &&
+		git -C r3 add $n &&
+		echo "This is file: dir1/$n" > r3/dir1/$n &&
+		git -C r3 add dir1/$n || return 1
 	done &&
 	git -C r3 commit -m "sparse" &&
 	echo dir1/ >pattern1 &&
@@ -288,7 +339,7 @@ test_expect_success 'setup r3' '
 test_expect_success 'verify blob count in normal packfile' '
 	git -C r3 ls-files -s sparse1 sparse2 dir1/sparse1 dir1/sparse2 \
 		>ls_files_result &&
-	awk -f print_2.awk ls_files_result |
+	test_parse_ls_files_stage_oids <ls_files_result |
 	sort >expected &&
 
 	git -C r3 pack-objects --revs --stdout >all.pack <<-EOF &&
@@ -298,7 +349,7 @@ test_expect_success 'verify blob count in normal packfile' '
 
 	git -C r3 verify-pack -v ../all.pack >verify_result &&
 	grep blob verify_result |
-	awk -f print_1.awk |
+	parse_verify_pack_blob_oid |
 	sort >observed &&
 
 	test_cmp expected observed
@@ -328,10 +379,10 @@ test_expect_success 'setup r4' '
 	mkdir r4/dir1 &&
 	for n in sparse1 sparse2
 	do
-		echo "This is file: $n" > r4/$n
-		git -C r4 add $n
-		echo "This is file: dir1/$n" > r4/dir1/$n
-		git -C r4 add dir1/$n
+		echo "This is file: $n" > r4/$n &&
+		git -C r4 add $n &&
+		echo "This is file: dir1/$n" > r4/dir1/$n &&
+		git -C r4 add dir1/$n || return 1
 	done &&
 	echo dir1/ >r4/pattern &&
 	git -C r4 add pattern &&
@@ -341,7 +392,7 @@ test_expect_success 'setup r4' '
 test_expect_success 'verify blob count in normal packfile' '
 	git -C r4 ls-files -s pattern sparse1 sparse2 dir1/sparse1 dir1/sparse2 \
 		>ls_files_result &&
-	awk -f print_2.awk ls_files_result |
+	test_parse_ls_files_stage_oids <ls_files_result |
 	sort >expected &&
 
 	git -C r4 pack-objects --revs --stdout >all.pack <<-EOF &&
@@ -351,7 +402,7 @@ test_expect_success 'verify blob count in normal packfile' '
 
 	git -C r4 verify-pack -v ../all.pack >verify_result &&
 	grep blob verify_result |
-	awk -f print_1.awk |
+	parse_verify_pack_blob_oid |
 	sort >observed &&
 
 	test_cmp expected observed
@@ -359,11 +410,11 @@ test_expect_success 'verify blob count in normal packfile' '
 
 test_expect_success 'verify sparse:oid=OID' '
 	git -C r4 ls-files -s dir1/sparse1 dir1/sparse2 >ls_files_result &&
-	awk -f print_2.awk ls_files_result |
+	test_parse_ls_files_stage_oids <ls_files_result |
 	sort >expected &&
 
 	git -C r4 ls-files -s pattern >staged &&
-	oid=$(awk -f print_2.awk staged) &&
+	oid=$(test_parse_ls_files_stage_oids <staged) &&
 	git -C r4 pack-objects --revs --stdout --filter=sparse:oid=$oid >filter.pack <<-EOF &&
 	HEAD
 	EOF
@@ -371,7 +422,7 @@ test_expect_success 'verify sparse:oid=OID' '
 
 	git -C r4 verify-pack -v ../filter.pack >verify_result &&
 	grep blob verify_result |
-	awk -f print_1.awk |
+	parse_verify_pack_blob_oid |
 	sort >observed &&
 
 	test_cmp expected observed
@@ -379,17 +430,17 @@ test_expect_success 'verify sparse:oid=OID' '
 
 test_expect_success 'verify sparse:oid=oid-ish' '
 	git -C r4 ls-files -s dir1/sparse1 dir1/sparse2 >ls_files_result &&
-	awk -f print_2.awk ls_files_result |
+	test_parse_ls_files_stage_oids <ls_files_result |
 	sort >expected &&
 
-	git -C r4 pack-objects --revs --stdout --filter=sparse:oid=master:pattern >filter.pack <<-EOF &&
+	git -C r4 pack-objects --revs --stdout --filter=sparse:oid=main:pattern >filter.pack <<-EOF &&
 	HEAD
 	EOF
 	git -C r4 index-pack ../filter.pack &&
 
 	git -C r4 verify-pack -v ../filter.pack >verify_result &&
 	grep blob verify_result |
-	awk -f print_1.awk |
+	parse_verify_pack_blob_oid |
 	sort >observed &&
 
 	test_cmp expected observed
@@ -401,12 +452,12 @@ test_expect_success 'verify sparse:oid=oid-ish' '
 test_expect_success 'setup r1 - delete loose blobs' '
 	git -C r1 ls-files -s file.1 file.2 file.3 file.4 file.5 \
 		>ls_files_result &&
-	awk -f print_2.awk ls_files_result |
+	test_parse_ls_files_stage_oids <ls_files_result |
 	sort >expected &&
 
-	for id in `cat expected | sed "s|..|&/|"`
+	for id in `sed "s|..|&/|" expected`
 	do
-		rm r1/.git/objects/$id
+		rm r1/.git/objects/$id || return 1
 	done
 '
 
diff --git a/t/t5318-commit-graph.sh b/t/t5318-commit-graph.sh
index 044cf8a..a2b4442 100755
--- a/t/t5318-commit-graph.sh
+++ b/t/t5318-commit-graph.sh
@@ -2,15 +2,33 @@
 
 test_description='commit graph'
 . ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-chunk.sh
 
 GIT_TEST_COMMIT_GRAPH_CHANGED_PATHS=0
 
+test_expect_success 'usage' '
+	test_expect_code 129 git commit-graph write blah 2>err &&
+	test_expect_code 129 git commit-graph write verify
+'
+
+test_expect_success 'usage shown without sub-command' '
+	test_expect_code 129 git commit-graph 2>err &&
+	grep usage: err
+'
+
+test_expect_success 'usage shown with an error on unknown sub-command' '
+	cat >expect <<-\EOF &&
+	error: unknown subcommand: `unknown'\''
+	EOF
+	test_expect_code 129 git commit-graph unknown 2>stderr &&
+	grep error stderr >actual &&
+	test_cmp expect actual
+'
+
+objdir=".git/objects"
+
 test_expect_success 'setup full repo' '
-	mkdir full &&
-	cd "$TRASH_DIRECTORY/full" &&
-	git init &&
-	git config core.commitGraph true &&
-	objdir=".git/objects"
+	git init full
 '
 
 test_expect_success POSIXPERM 'tweak umask for modebit tests' '
@@ -18,185 +36,135 @@ test_expect_success POSIXPERM 'tweak umask for modebit tests' '
 '
 
 test_expect_success 'verify graph with no graph file' '
-	cd "$TRASH_DIRECTORY/full" &&
-	git commit-graph verify
+	git -C full commit-graph verify
 '
 
 test_expect_success 'write graph with no packs' '
-	cd "$TRASH_DIRECTORY/full" &&
-	git commit-graph write --object-dir $objdir &&
-	test_path_is_missing $objdir/info/commit-graph
+	git -C full commit-graph write --object-dir $objdir &&
+	test_path_is_missing full/$objdir/info/commit-graph
 '
 
 test_expect_success 'exit with correct error on bad input to --stdin-packs' '
-	cd "$TRASH_DIRECTORY/full" &&
 	echo doesnotexist >in &&
-	test_expect_code 1 git commit-graph write --stdin-packs <in 2>stderr &&
-	test_i18ngrep "error adding pack" stderr
+	test_expect_code 1 git -C full commit-graph write --stdin-packs \
+		<in 2>stderr &&
+	test_grep "error adding pack" stderr
 '
 
 test_expect_success 'create commits and repack' '
-	cd "$TRASH_DIRECTORY/full" &&
 	for i in $(test_seq 3)
 	do
-		test_commit $i &&
-		git branch commits/$i
+		test_commit -C full $i &&
+		git -C full branch commits/$i || return 1
 	done &&
-	git repack
+	git -C full repack
 '
 
-graph_git_two_modes() {
-	git -c core.commitGraph=true $1 >output
-	git -c core.commitGraph=false $1 >expect
-	test_cmp expect output
-}
-
-graph_git_behavior() {
-	MSG=$1
-	DIR=$2
-	BRANCH=$3
-	COMPARE=$4
-	test_expect_success "check normal git operations: $MSG" '
-		cd "$TRASH_DIRECTORY/$DIR" &&
-		graph_git_two_modes "log --oneline $BRANCH" &&
-		graph_git_two_modes "log --topo-order $BRANCH" &&
-		graph_git_two_modes "log --graph $COMPARE..$BRANCH" &&
-		graph_git_two_modes "branch -vv" &&
-		graph_git_two_modes "merge-base -a $BRANCH $COMPARE"
-	'
-}
+. "$TEST_DIRECTORY"/lib-commit-graph.sh
 
 graph_git_behavior 'no graph' full commits/3 commits/1
 
-graph_read_expect() {
-	OPTIONAL=""
-	NUM_CHUNKS=3
-	if test ! -z $2
-	then
-		OPTIONAL=" $2"
-		NUM_CHUNKS=$((3 + $(echo "$2" | wc -w)))
-	fi
-	cat >expect <<- EOF
-	header: 43475048 1 1 $NUM_CHUNKS 0
-	num_commits: $1
-	chunks: oid_fanout oid_lookup commit_metadata$OPTIONAL
-	EOF
-	test-tool read-graph >output &&
-	test_cmp expect output
-}
-
 test_expect_success 'exit with correct error on bad input to --stdin-commits' '
-	cd "$TRASH_DIRECTORY/full" &&
 	# invalid, non-hex OID
-	echo HEAD >in &&
-	test_expect_code 1 git commit-graph write --stdin-commits <in 2>stderr &&
-	test_i18ngrep "unexpected non-hex object ID: HEAD" stderr &&
+	echo HEAD | test_expect_code 1 git -C full commit-graph write \
+		--stdin-commits 2>stderr &&
+	test_grep "unexpected non-hex object ID: HEAD" stderr &&
 	# non-existent OID
-	echo $ZERO_OID >in &&
-	test_expect_code 1 git commit-graph write --stdin-commits <in 2>stderr &&
-	test_i18ngrep "invalid object" stderr &&
+	echo $ZERO_OID | test_expect_code 1 git -C full commit-graph write \
+		--stdin-commits 2>stderr &&
+	test_grep "invalid object" stderr &&
 	# valid commit and tree OID
-	git rev-parse HEAD HEAD^{tree} >in &&
-	git commit-graph write --stdin-commits <in &&
-	graph_read_expect 3
+	git -C full rev-parse HEAD HEAD^{tree} >in &&
+	git -C full commit-graph write --stdin-commits <in &&
+	graph_read_expect -C full 3 generation_data
 '
 
 test_expect_success 'write graph' '
-	cd "$TRASH_DIRECTORY/full" &&
-	git commit-graph write &&
-	test_path_is_file $objdir/info/commit-graph &&
-	graph_read_expect "3"
+	git -C full commit-graph write &&
+	test_path_is_file full/$objdir/info/commit-graph &&
+	graph_read_expect -C full 3 generation_data
 '
 
 test_expect_success POSIXPERM 'write graph has correct permissions' '
-	test_path_is_file $objdir/info/commit-graph &&
+	test_path_is_file full/$objdir/info/commit-graph &&
 	echo "-r--r--r--" >expect &&
-	test_modebits $objdir/info/commit-graph >actual &&
+	test_modebits full/$objdir/info/commit-graph >actual &&
 	test_cmp expect actual
 '
 
 graph_git_behavior 'graph exists' full commits/3 commits/1
 
 test_expect_success 'Add more commits' '
-	cd "$TRASH_DIRECTORY/full" &&
-	git reset --hard commits/1 &&
+	git -C full reset --hard commits/1 &&
 	for i in $(test_seq 4 5)
 	do
-		test_commit $i &&
-		git branch commits/$i
+		test_commit -C full $i &&
+		git -C full branch commits/$i || return 1
 	done &&
-	git reset --hard commits/2 &&
+	git -C full reset --hard commits/2 &&
 	for i in $(test_seq 6 7)
 	do
-		test_commit $i &&
-		git branch commits/$i
+		test_commit -C full $i &&
+		git -C full branch commits/$i || return 1
 	done &&
-	git reset --hard commits/2 &&
-	git merge commits/4 &&
-	git branch merge/1 &&
-	git reset --hard commits/4 &&
-	git merge commits/6 &&
-	git branch merge/2 &&
-	git reset --hard commits/3 &&
-	git merge commits/5 commits/7 &&
-	git branch merge/3 &&
-	git repack
+	git -C full reset --hard commits/2 &&
+	git -C full merge commits/4 &&
+	git -C full branch merge/1 &&
+	git -C full reset --hard commits/4 &&
+	git -C full merge commits/6 &&
+	git -C full branch merge/2 &&
+	git -C full reset --hard commits/3 &&
+	git -C full merge commits/5 commits/7 &&
+	git -C full branch merge/3 &&
+	git -C full repack
 '
 
 test_expect_success 'commit-graph write progress off for redirected stderr' '
-	cd "$TRASH_DIRECTORY/full" &&
-	git commit-graph write 2>err &&
+	git -C full commit-graph write 2>err &&
 	test_must_be_empty err
 '
 
 test_expect_success 'commit-graph write force progress on for stderr' '
-	cd "$TRASH_DIRECTORY/full" &&
-	GIT_PROGRESS_DELAY=0 git commit-graph write --progress 2>err &&
+	GIT_PROGRESS_DELAY=0 git -C full commit-graph write --progress 2>err &&
 	test_file_not_empty err
 '
 
 test_expect_success 'commit-graph write with the --no-progress option' '
-	cd "$TRASH_DIRECTORY/full" &&
-	git commit-graph write --no-progress 2>err &&
+	git -C full commit-graph write --no-progress 2>err &&
 	test_must_be_empty err
 '
 
 test_expect_success 'commit-graph write --stdin-commits progress off for redirected stderr' '
-	cd "$TRASH_DIRECTORY/full" &&
-	git rev-parse commits/5 >in &&
-	git commit-graph write --stdin-commits <in 2>err &&
+	git -C full rev-parse commits/5 >in &&
+	git -C full commit-graph write --stdin-commits <in 2>err &&
 	test_must_be_empty err
 '
 
 test_expect_success 'commit-graph write --stdin-commits force progress on for stderr' '
-	cd "$TRASH_DIRECTORY/full" &&
-	git rev-parse commits/5 >in &&
-	GIT_PROGRESS_DELAY=0 git commit-graph write --stdin-commits --progress <in 2>err &&
-	test_i18ngrep "Collecting commits from input" err
+	git -C full rev-parse commits/5 >in &&
+	GIT_PROGRESS_DELAY=0 git -C full commit-graph write --stdin-commits \
+		--progress <in 2>err &&
+	test_grep "Collecting commits from input" err
 '
 
 test_expect_success 'commit-graph write --stdin-commits with the --no-progress option' '
-	cd "$TRASH_DIRECTORY/full" &&
-	git rev-parse commits/5 >in &&
-	git commit-graph write --stdin-commits --no-progress <in 2>err &&
+	git -C full rev-parse commits/5 >in &&
+	git -C full commit-graph write --stdin-commits --no-progress <in 2>err &&
 	test_must_be_empty err
 '
 
 test_expect_success 'commit-graph verify progress off for redirected stderr' '
-	cd "$TRASH_DIRECTORY/full" &&
-	git commit-graph verify 2>err &&
+	git -C full commit-graph verify 2>err &&
 	test_must_be_empty err
 '
 
 test_expect_success 'commit-graph verify force progress on for stderr' '
-	cd "$TRASH_DIRECTORY/full" &&
-	GIT_PROGRESS_DELAY=0 git commit-graph verify --progress 2>err &&
+	GIT_PROGRESS_DELAY=0 git -C full commit-graph verify --progress 2>err &&
 	test_file_not_empty err
 '
 
 test_expect_success 'commit-graph verify with the --no-progress option' '
-	cd "$TRASH_DIRECTORY/full" &&
-	git commit-graph verify --no-progress 2>err &&
+	git -C full commit-graph verify --no-progress 2>err &&
 	test_must_be_empty err
 '
 
@@ -211,10 +179,9 @@ test_expect_success 'commit-graph verify with the --no-progress option' '
 # 1
 
 test_expect_success 'write graph with merges' '
-	cd "$TRASH_DIRECTORY/full" &&
-	git commit-graph write &&
-	test_path_is_file $objdir/info/commit-graph &&
-	graph_read_expect "10" "extra_edges"
+	git -C full commit-graph write &&
+	test_path_is_file full/$objdir/info/commit-graph &&
+	graph_read_expect -C full 10 "generation_data extra_edges"
 '
 
 graph_git_behavior 'merge 1 vs 2' full merge/1 merge/2
@@ -222,12 +189,11 @@ graph_git_behavior 'merge 1 vs 3' full merge/1 merge/3
 graph_git_behavior 'merge 2 vs 3' full merge/2 merge/3
 
 test_expect_success 'Add one more commit' '
-	cd "$TRASH_DIRECTORY/full" &&
-	test_commit 8 &&
-	git branch commits/8 &&
-	ls $objdir/pack | grep idx >existing-idx &&
-	git repack &&
-	ls $objdir/pack| grep idx | grep -v -f existing-idx >new-idx
+	test_commit -C full 8 &&
+	git -C full branch commits/8 &&
+	ls full/$objdir/pack | grep idx >existing-idx &&
+	git -C full repack &&
+	ls full/$objdir/pack| grep idx | grep -v -f existing-idx >new-idx
 '
 
 # Current graph structure:
@@ -246,114 +212,101 @@ graph_git_behavior 'mixed mode, commit 8 vs merge 1' full commits/8 merge/1
 graph_git_behavior 'mixed mode, commit 8 vs merge 2' full commits/8 merge/2
 
 test_expect_success 'write graph with new commit' '
-	cd "$TRASH_DIRECTORY/full" &&
-	git commit-graph write &&
-	test_path_is_file $objdir/info/commit-graph &&
-	graph_read_expect "11" "extra_edges"
+	git -C full commit-graph write &&
+	test_path_is_file full/$objdir/info/commit-graph &&
+	graph_read_expect -C full 11 "generation_data extra_edges"
 '
 
 graph_git_behavior 'full graph, commit 8 vs merge 1' full commits/8 merge/1
 graph_git_behavior 'full graph, commit 8 vs merge 2' full commits/8 merge/2
 
 test_expect_success 'write graph with nothing new' '
-	cd "$TRASH_DIRECTORY/full" &&
-	git commit-graph write &&
-	test_path_is_file $objdir/info/commit-graph &&
-	graph_read_expect "11" "extra_edges"
+	git -C full commit-graph write &&
+	test_path_is_file full/$objdir/info/commit-graph &&
+	graph_read_expect -C full 11 "generation_data extra_edges"
 '
 
 graph_git_behavior 'cleared graph, commit 8 vs merge 1' full commits/8 merge/1
 graph_git_behavior 'cleared graph, commit 8 vs merge 2' full commits/8 merge/2
 
 test_expect_success 'build graph from latest pack with closure' '
-	cd "$TRASH_DIRECTORY/full" &&
-	cat new-idx | git commit-graph write --stdin-packs &&
-	test_path_is_file $objdir/info/commit-graph &&
-	graph_read_expect "9" "extra_edges"
+	git -C full commit-graph write --stdin-packs <new-idx &&
+	test_path_is_file full/$objdir/info/commit-graph &&
+	graph_read_expect -C full 9 "generation_data extra_edges"
 '
 
 graph_git_behavior 'graph from pack, commit 8 vs merge 1' full commits/8 merge/1
 graph_git_behavior 'graph from pack, commit 8 vs merge 2' full commits/8 merge/2
 
 test_expect_success 'build graph from commits with closure' '
-	cd "$TRASH_DIRECTORY/full" &&
-	git tag -a -m "merge" tag/merge merge/2 &&
-	git rev-parse tag/merge >commits-in &&
-	git rev-parse merge/1 >>commits-in &&
-	cat commits-in | git commit-graph write --stdin-commits &&
-	test_path_is_file $objdir/info/commit-graph &&
-	graph_read_expect "6"
+	git -C full tag -a -m "merge" tag/merge merge/2 &&
+	git -C full rev-parse tag/merge >commits-in &&
+	git -C full rev-parse merge/1 >>commits-in &&
+	git -C full commit-graph write --stdin-commits <commits-in &&
+	test_path_is_file full/$objdir/info/commit-graph &&
+	graph_read_expect -C full 6 "generation_data"
 '
 
 graph_git_behavior 'graph from commits, commit 8 vs merge 1' full commits/8 merge/1
 graph_git_behavior 'graph from commits, commit 8 vs merge 2' full commits/8 merge/2
 
 test_expect_success 'build graph from commits with append' '
-	cd "$TRASH_DIRECTORY/full" &&
-	git rev-parse merge/3 | git commit-graph write --stdin-commits --append &&
-	test_path_is_file $objdir/info/commit-graph &&
-	graph_read_expect "10" "extra_edges"
+	git -C full rev-parse merge/3 >in &&
+	git -C full commit-graph write --stdin-commits --append <in &&
+	test_path_is_file full/$objdir/info/commit-graph &&
+	graph_read_expect -C full 10 "generation_data extra_edges"
 '
 
 graph_git_behavior 'append graph, commit 8 vs merge 1' full commits/8 merge/1
 graph_git_behavior 'append graph, commit 8 vs merge 2' full commits/8 merge/2
 
 test_expect_success 'build graph using --reachable' '
-	cd "$TRASH_DIRECTORY/full" &&
-	git commit-graph write --reachable &&
-	test_path_is_file $objdir/info/commit-graph &&
-	graph_read_expect "11" "extra_edges"
+	git -C full commit-graph write --reachable &&
+	test_path_is_file full/$objdir/info/commit-graph &&
+	graph_read_expect -C full 11 "generation_data extra_edges"
 '
 
 graph_git_behavior 'append graph, commit 8 vs merge 1' full commits/8 merge/1
 graph_git_behavior 'append graph, commit 8 vs merge 2' full commits/8 merge/2
 
 test_expect_success 'setup bare repo' '
-	cd "$TRASH_DIRECTORY" &&
-	git clone --bare --no-local full bare &&
-	cd bare &&
-	git config core.commitGraph true &&
-	baredir="./objects"
+	git clone --bare --no-local full bare
 '
 
 graph_git_behavior 'bare repo, commit 8 vs merge 1' bare commits/8 merge/1
 graph_git_behavior 'bare repo, commit 8 vs merge 2' bare commits/8 merge/2
 
 test_expect_success 'write graph in bare repo' '
-	cd "$TRASH_DIRECTORY/bare" &&
-	git commit-graph write &&
-	test_path_is_file $baredir/info/commit-graph &&
-	graph_read_expect "11" "extra_edges"
+	git -C bare commit-graph write &&
+	test_path_is_file bare/objects/info/commit-graph &&
+	graph_read_expect -C bare 11 "generation_data extra_edges"
 '
 
 graph_git_behavior 'bare repo with graph, commit 8 vs merge 1' bare commits/8 merge/1
 graph_git_behavior 'bare repo with graph, commit 8 vs merge 2' bare commits/8 merge/2
 
 test_expect_success 'perform fast-forward merge in full repo' '
-	cd "$TRASH_DIRECTORY/full" &&
-	git checkout -b merge-5-to-8 commits/5 &&
-	git merge commits/8 &&
-	git show-ref -s merge-5-to-8 >output &&
-	git show-ref -s commits/8 >expect &&
+	git -C full checkout -b merge-5-to-8 commits/5 &&
+	git -C full merge commits/8 &&
+	git -C full show-ref -s merge-5-to-8 >output &&
+	git -C full show-ref -s commits/8 >expect &&
 	test_cmp expect output
 '
 
 test_expect_success 'check that gc computes commit-graph' '
-	cd "$TRASH_DIRECTORY/full" &&
-	git commit --allow-empty -m "blank" &&
-	git commit-graph write --reachable &&
-	cp $objdir/info/commit-graph commit-graph-before-gc &&
-	git reset --hard HEAD~1 &&
-	git config gc.writeCommitGraph true &&
-	git gc &&
-	cp $objdir/info/commit-graph commit-graph-after-gc &&
+	test_commit -C full --no-tag blank &&
+	git -C full commit-graph write --reachable &&
+	cp full/$objdir/info/commit-graph commit-graph-before-gc &&
+	git -C full reset --hard HEAD~1 &&
+	test_config -C full gc.writeCommitGraph true &&
+	git -C full gc &&
+	cp full/$objdir/info/commit-graph commit-graph-after-gc &&
 	! test_cmp_bin commit-graph-before-gc commit-graph-after-gc &&
-	git commit-graph write --reachable &&
-	test_cmp_bin commit-graph-after-gc $objdir/info/commit-graph
+	git -C full commit-graph write --reachable &&
+	test_cmp_bin commit-graph-after-gc full/$objdir/info/commit-graph
 '
 
 test_expect_success 'replace-objects invalidates commit-graph' '
-	cd "$TRASH_DIRECTORY" &&
 	test_when_finished rm -rf replace &&
 	git clone full replace &&
 	(
@@ -361,6 +314,7 @@ test_expect_success 'replace-objects invalidates commit-graph' '
 		git commit-graph write --reachable &&
 		test_path_is_file .git/objects/info/commit-graph &&
 		git replace HEAD~1 HEAD~2 &&
+		graph_git_two_modes "commit-graph verify" &&
 		git -c core.commitGraph=false log >expect &&
 		git -c core.commitGraph=true log >actual &&
 		test_cmp expect actual &&
@@ -375,15 +329,15 @@ test_expect_success 'replace-objects invalidates commit-graph' '
 '
 
 test_expect_success 'commit grafts invalidate commit-graph' '
-	cd "$TRASH_DIRECTORY" &&
 	test_when_finished rm -rf graft &&
-	git clone full graft &&
+	git clone --template= full graft &&
 	(
 		cd graft &&
 		git commit-graph write --reachable &&
 		test_path_is_file .git/objects/info/commit-graph &&
 		H1=$(git rev-parse --verify HEAD~1) &&
 		H3=$(git rev-parse --verify HEAD~3) &&
+		mkdir .git/info &&
 		echo "$H1 $H3" >.git/info/grafts &&
 		git -c core.commitGraph=false log >expect &&
 		git -c core.commitGraph=true log >actual &&
@@ -399,7 +353,6 @@ test_expect_success 'commit grafts invalidate commit-graph' '
 '
 
 test_expect_success 'replace-objects invalidates commit-graph' '
-	cd "$TRASH_DIRECTORY" &&
 	test_when_finished rm -rf shallow &&
 	git clone --depth 2 "file://$TRASH_DIRECTORY/full" shallow &&
 	(
@@ -412,6 +365,57 @@ test_expect_success 'replace-objects invalidates commit-graph' '
 	)
 '
 
+test_expect_success 'warn on improper hash version' '
+	git init --object-format=sha1 sha1 &&
+	(
+		cd sha1 &&
+		test_commit 1 &&
+		git commit-graph write --reachable &&
+		mv .git/objects/info/commit-graph ../cg-sha1
+	) &&
+	git init --object-format=sha256 sha256 &&
+	(
+		cd sha256 &&
+		test_commit 1 &&
+		git commit-graph write --reachable &&
+		mv .git/objects/info/commit-graph ../cg-sha256
+	) &&
+	(
+		cd sha1 &&
+		mv ../cg-sha256 .git/objects/info/commit-graph &&
+		git log -1 2>err &&
+		test_grep "commit-graph hash version 2 does not match version 1" err
+	) &&
+	(
+		cd sha256 &&
+		mv ../cg-sha1 .git/objects/info/commit-graph &&
+		git log -1 2>err &&
+		test_grep "commit-graph hash version 1 does not match version 2" err
+	)
+'
+
+test_expect_success TIME_IS_64BIT,TIME_T_IS_64BIT 'lower layers have overflow chunk' '
+	UNIX_EPOCH_ZERO="@0 +0000" &&
+	FUTURE_DATE="@4147483646 +0000" &&
+	rm -f full/.git/objects/info/commit-graph &&
+	test_commit -C full --date "$FUTURE_DATE" future-1 &&
+	test_commit -C full --date "$UNIX_EPOCH_ZERO" old-1 &&
+	git -C full commit-graph write --reachable &&
+	test_commit -C full --date "$FUTURE_DATE" future-2 &&
+	test_commit -C full --date "$UNIX_EPOCH_ZERO" old-2 &&
+	git -C full commit-graph write --reachable --split=no-merge &&
+	test_commit -C full extra &&
+	git -C full commit-graph write --reachable --split=no-merge &&
+	git -C full commit-graph write --reachable &&
+	graph_read_expect -C full 16 \
+		"generation_data generation_data_overflow extra_edges" &&
+	mv full/.git/objects/info/commit-graph commit-graph-upgraded &&
+	git -C full commit-graph write --reachable &&
+	graph_read_expect -C full 16 \
+		"generation_data generation_data_overflow extra_edges" &&
+	test_cmp full/.git/objects/info/commit-graph commit-graph-upgraded
+'
+
 # the verify tests below expect the commit-graph to contain
 # exactly the commits reachable from the commits/8 branch.
 # If the file changes the set of commits in the list, then the
@@ -419,9 +423,11 @@ test_expect_success 'replace-objects invalidates commit-graph' '
 # and the tests will likely break.
 
 test_expect_success 'git commit-graph verify' '
-	cd "$TRASH_DIRECTORY/full" &&
-	git rev-parse commits/8 | git commit-graph write --stdin-commits &&
-	git commit-graph verify >output
+	git -C full rev-parse commits/8 >in &&
+	git -C full -c commitGraph.generationVersion=1 commit-graph write \
+		--stdin-commits <in &&
+	git -C full commit-graph verify >output &&
+	graph_read_expect -C full 9 extra_edges 1
 '
 
 NUM_COMMITS=9
@@ -445,39 +451,39 @@ GRAPH_BYTE_FANOUT2=$(($GRAPH_FANOUT_OFFSET + 4 * 255))
 GRAPH_OID_LOOKUP_OFFSET=$(($GRAPH_FANOUT_OFFSET + 4 * 256))
 GRAPH_BYTE_OID_LOOKUP_ORDER=$(($GRAPH_OID_LOOKUP_OFFSET + $HASH_LEN * 8))
 GRAPH_BYTE_OID_LOOKUP_MISSING=$(($GRAPH_OID_LOOKUP_OFFSET + $HASH_LEN * 4 + 10))
+GRAPH_COMMIT_DATA_WIDTH=$(($HASH_LEN + 16))
 GRAPH_COMMIT_DATA_OFFSET=$(($GRAPH_OID_LOOKUP_OFFSET + $HASH_LEN * $NUM_COMMITS))
 GRAPH_BYTE_COMMIT_TREE=$GRAPH_COMMIT_DATA_OFFSET
 GRAPH_BYTE_COMMIT_PARENT=$(($GRAPH_COMMIT_DATA_OFFSET + $HASH_LEN))
 GRAPH_BYTE_COMMIT_EXTRA_PARENT=$(($GRAPH_COMMIT_DATA_OFFSET + $HASH_LEN + 4))
 GRAPH_BYTE_COMMIT_WRONG_PARENT=$(($GRAPH_COMMIT_DATA_OFFSET + $HASH_LEN + 3))
 GRAPH_BYTE_COMMIT_GENERATION=$(($GRAPH_COMMIT_DATA_OFFSET + $HASH_LEN + 11))
+GRAPH_BYTE_COMMIT_GENERATION_LAST=$(($GRAPH_BYTE_COMMIT_GENERATION + $(($NUM_COMMITS - 1)) * $GRAPH_COMMIT_DATA_WIDTH))
 GRAPH_BYTE_COMMIT_DATE=$(($GRAPH_COMMIT_DATA_OFFSET + $HASH_LEN + 12))
-GRAPH_COMMIT_DATA_WIDTH=$(($HASH_LEN + 16))
 GRAPH_OCTOPUS_DATA_OFFSET=$(($GRAPH_COMMIT_DATA_OFFSET + \
 			     $GRAPH_COMMIT_DATA_WIDTH * $NUM_COMMITS))
 GRAPH_BYTE_OCTOPUS=$(($GRAPH_OCTOPUS_DATA_OFFSET + 4))
 GRAPH_BYTE_FOOTER=$(($GRAPH_OCTOPUS_DATA_OFFSET + 4 * $NUM_OCTOPUS_EDGES))
 
 corrupt_graph_setup() {
-	cd "$TRASH_DIRECTORY/full" &&
-	test_when_finished mv commit-graph-backup $objdir/info/commit-graph &&
-	cp $objdir/info/commit-graph commit-graph-backup &&
-	chmod u+w $objdir/info/commit-graph
+	test_when_finished mv commit-graph-backup full/$objdir/info/commit-graph &&
+	cp full/$objdir/info/commit-graph commit-graph-backup &&
+	chmod u+w full/$objdir/info/commit-graph
 }
 
 corrupt_graph_verify() {
 	grepstr=$1
-	test_must_fail git commit-graph verify 2>test_err &&
+	test_must_fail git -C full commit-graph verify 2>test_err &&
 	grep -v "^+" test_err >err &&
-	test_i18ngrep "$grepstr" err &&
+	test_grep "$grepstr" err &&
 	if test "$2" != "no-copy"
 	then
-		cp $objdir/info/commit-graph commit-graph-pre-write-test
+		cp full/$objdir/info/commit-graph commit-graph-pre-write-test
 	fi &&
-	git status --short &&
-	GIT_TEST_COMMIT_GRAPH_DIE_ON_PARSE=true git commit-graph write &&
-	chmod u+w $objdir/info/commit-graph &&
-	git commit-graph verify
+	git -C full status --short &&
+	GIT_TEST_COMMIT_GRAPH_DIE_ON_PARSE=true git -C full commit-graph write &&
+	chmod u+w full/$objdir/info/commit-graph &&
+	git -C full commit-graph verify
 }
 
 # usage: corrupt_graph_and_verify <position> <data> <string> [<zero_pos>]
@@ -491,24 +497,24 @@ corrupt_graph_and_verify() {
 	data="${2:-\0}"
 	grepstr=$3
 	corrupt_graph_setup &&
-	orig_size=$(wc -c < $objdir/info/commit-graph) &&
+	orig_size=$(wc -c <full/$objdir/info/commit-graph) &&
 	zero_pos=${4:-${orig_size}} &&
-	printf "$data" | dd of="$objdir/info/commit-graph" bs=1 seek="$pos" conv=notrunc &&
-	dd of="$objdir/info/commit-graph" bs=1 seek="$zero_pos" if=/dev/null &&
-	generate_zero_bytes $(($orig_size - $zero_pos)) >>"$objdir/info/commit-graph" &&
+	printf "$data" | dd of="full/$objdir/info/commit-graph" bs=1 seek="$pos" conv=notrunc &&
+	dd of="full/$objdir/info/commit-graph" bs=1 seek="$zero_pos" if=/dev/null &&
+	test-tool genzeros $(($orig_size - $zero_pos)) >>"full/$objdir/info/commit-graph" &&
 	corrupt_graph_verify "$grepstr"
 
 }
 
 test_expect_success POSIXPERM,SANITY 'detect permission problem' '
 	corrupt_graph_setup &&
-	chmod 000 $objdir/info/commit-graph &&
+	chmod 000 full/$objdir/info/commit-graph &&
 	corrupt_graph_verify "Could not open" "no-copy"
 '
 
 test_expect_success 'detect too small' '
 	corrupt_graph_setup &&
-	echo "a small graph" >$objdir/info/commit-graph &&
+	echo "a small graph" >full/$objdir/info/commit-graph &&
 	corrupt_graph_verify "too small"
 '
 
@@ -529,22 +535,22 @@ test_expect_success 'detect bad hash version' '
 
 test_expect_success 'detect low chunk count' '
 	corrupt_graph_and_verify $GRAPH_BYTE_CHUNK_COUNT "\01" \
-		"missing the .* chunk"
+		"final chunk has non-zero id"
 '
 
 test_expect_success 'detect missing OID fanout chunk' '
 	corrupt_graph_and_verify $GRAPH_BYTE_OID_FANOUT_ID "\0" \
-		"missing the OID Fanout chunk"
+		"commit-graph required OID fanout chunk missing or corrupted"
 '
 
 test_expect_success 'detect missing OID lookup chunk' '
 	corrupt_graph_and_verify $GRAPH_BYTE_OID_LOOKUP_ID "\0" \
-		"missing the OID Lookup chunk"
+		"commit-graph required OID lookup chunk missing or corrupted"
 '
 
 test_expect_success 'detect missing commit data chunk' '
 	corrupt_graph_and_verify $GRAPH_BYTE_COMMIT_DATA_ID "\0" \
-		"missing the Commit Data chunk"
+		"commit-graph required commit data chunk missing or corrupted"
 '
 
 test_expect_success 'detect incorrect fanout' '
@@ -554,7 +560,7 @@ test_expect_success 'detect incorrect fanout' '
 
 test_expect_success 'detect incorrect fanout final value' '
 	corrupt_graph_and_verify $GRAPH_BYTE_FANOUT2 "\01" \
-		"fanout value"
+		"OID lookup chunk is the wrong size"
 '
 
 test_expect_success 'detect incorrect OID order' '
@@ -592,11 +598,6 @@ test_expect_success 'detect incorrect generation number' '
 		"generation for commit"
 '
 
-test_expect_success 'detect incorrect generation number' '
-	corrupt_graph_and_verify $GRAPH_BYTE_COMMIT_GENERATION "\01" \
-		"non-zero generation number"
-'
-
 test_expect_success 'detect incorrect commit date' '
 	corrupt_graph_and_verify $GRAPH_BYTE_COMMIT_DATE "\01" \
 		"commit date"
@@ -618,13 +619,51 @@ test_expect_success 'detect incorrect chunk count' '
 		$GRAPH_CHUNK_LOOKUP_OFFSET
 '
 
-test_expect_success 'git fsck (checks commit-graph)' '
-	cd "$TRASH_DIRECTORY/full" &&
-	git fsck &&
+test_expect_success 'detect mixed generation numbers (non-zero to zero)' '
+	corrupt_graph_and_verify $GRAPH_BYTE_COMMIT_GENERATION_LAST "\0\0\0\0" \
+		"both zero and non-zero generations"
+'
+
+test_expect_success 'detect mixed generation numbers (zero to non-zero)' '
+	corrupt_graph_and_verify $GRAPH_BYTE_COMMIT_GENERATION "\0\0\0\0" \
+		"both zero and non-zero generations"
+'
+
+test_expect_success 'git fsck (checks commit-graph when config set to true)' '
+	git -C full fsck &&
 	corrupt_graph_and_verify $GRAPH_BYTE_FOOTER "\00" \
 		"incorrect checksum" &&
-	cp commit-graph-pre-write-test $objdir/info/commit-graph &&
-	test_must_fail git fsck
+	cp commit-graph-pre-write-test full/$objdir/info/commit-graph &&
+	test_must_fail git -C full -c core.commitGraph=true fsck
+'
+
+test_expect_success 'git fsck (ignores commit-graph when config set to false)' '
+	git -C full fsck &&
+	corrupt_graph_and_verify $GRAPH_BYTE_FOOTER "\00" \
+		"incorrect checksum" &&
+	cp commit-graph-pre-write-test full/$objdir/info/commit-graph &&
+	git -C full -c core.commitGraph=false fsck
+'
+
+test_expect_success 'git fsck (checks commit-graph when config unset)' '
+	test_when_finished "git -C full config core.commitGraph true" &&
+
+	git -C full fsck &&
+	corrupt_graph_and_verify $GRAPH_BYTE_FOOTER "\00" \
+		"incorrect checksum" &&
+	test_unconfig -C full core.commitGraph &&
+	cp commit-graph-pre-write-test full/$objdir/info/commit-graph &&
+	test_must_fail git -C full fsck
+'
+
+test_expect_success 'git fsck shows commit-graph output with --progress' '
+	git -C "$TRASH_DIRECTORY/full" fsck --progress 2>err &&
+	grep "Verifying commits in commit graph" err
+'
+
+test_expect_success 'git fsck suppresses commit-graph output with --no-progress' '
+	git -C "$TRASH_DIRECTORY/full" fsck --no-progress 2>err &&
+	! grep "Verifying commits in commit graph" err
 '
 
 test_expect_success 'setup non-the_repository tests' '
@@ -682,7 +721,7 @@ test_expect_success 'corrupt commit-graph write (broken parent)' '
 		git commit-tree -p "$broken" -m "good commit" "$empty" >good &&
 		test_must_fail git commit-graph write --stdin-commits \
 			<good 2>test_err &&
-		test_i18ngrep "unable to parse commit" test_err
+		test_grep "unable to parse commit" test_err
 	)
 '
 
@@ -703,7 +742,206 @@ test_expect_success 'corrupt commit-graph write (missing tree)' '
 		git commit-tree -p "$broken" -m "good" "$tree" >good &&
 		test_must_fail git commit-graph write --stdin-commits \
 			<good 2>test_err &&
-		test_i18ngrep "unable to parse commit" test_err
+		test_grep "unable to parse commit" test_err
+	)
+'
+
+# We test the overflow-related code with the following repo history:
+#
+#               4:F - 5:N - 6:U
+#              /                \
+# 1:U - 2:N - 3:U                M:N
+#              \                /
+#               7:N - 8:F - 9:N
+#
+# Here the commits denoted by U have committer date of zero seconds
+# since Unix epoch, the commits denoted by N have committer date
+# starting from 1112354055 seconds since Unix epoch (default committer
+# date for the test suite), and the commits denoted by F have committer
+# date of (2 ^ 31 - 2) seconds since Unix epoch.
+#
+# The largest offset observed is 2 ^ 31, just large enough to overflow.
+#
+
+test_expect_success 'set up and verify repo with generation data overflow chunk' '
+	UNIX_EPOCH_ZERO="@0 +0000" &&
+	FUTURE_DATE="@2147483646 +0000" &&
+
+	git init repo &&
+	(
+		cd repo &&
+
+		test_commit --date "$UNIX_EPOCH_ZERO" 1 &&
+		test_commit 2 &&
+		test_commit --date "$UNIX_EPOCH_ZERO" 3 &&
+		git commit-graph write --reachable &&
+		graph_read_expect 3 generation_data &&
+		test_commit --date "$FUTURE_DATE" 4 &&
+		test_commit 5 &&
+		test_commit --date "$UNIX_EPOCH_ZERO" 6 &&
+		git branch left &&
+		git reset --hard 3 &&
+		test_commit 7 &&
+		test_commit --date "$FUTURE_DATE" 8 &&
+		test_commit 9 &&
+		git branch right &&
+		git reset --hard 3 &&
+		test_merge M left right &&
+		git commit-graph write --reachable &&
+		graph_read_expect 10 "generation_data generation_data_overflow" &&
+		git commit-graph verify
+	)
+'
+
+graph_git_behavior 'generation data overflow chunk repo' repo left right
+
+test_expect_success 'overflow during generation version upgrade' '
+	git init overflow-v2-upgrade &&
+	(
+		cd overflow-v2-upgrade &&
+
+		# This commit will have a date at two seconds past the Epoch,
+		# and a (v1) generation number of 1, since it is a root commit.
+		#
+		# The offset will then be computed as 1-2, which will underflow
+		# to 2^31, which is greater than the v2 offset small limit of
+		# 2^31-1.
+		#
+		# This is sufficient to need a large offset table for the v2
+		# generation numbers.
+		test_commit --date "@2 +0000" base &&
+		git repack -d &&
+
+		# Test that upgrading from generation v1 to v2 correctly
+		# produces the overflow table.
+		git -c commitGraph.generationVersion=1 commit-graph write &&
+		git -c commitGraph.generationVersion=2 commit-graph write \
+			--changed-paths &&
+
+		git rev-list --all
+	)
+'
+
+corrupt_chunk () {
+	graph=full/.git/objects/info/commit-graph &&
+	test_when_finished "rm -rf $graph" &&
+	git -C full commit-graph write --reachable &&
+	corrupt_chunk_file $graph "$@"
+}
+
+check_corrupt_chunk () {
+	corrupt_chunk "$@" &&
+	git -C full -c core.commitGraph=false log >expect.out &&
+	git -C full -c core.commitGraph=true log >out 2>err &&
+	test_cmp expect.out out
+}
+
+test_expect_success 'reader notices too-small oid fanout chunk' '
+	# make it big enough that the graph file is plausible,
+	# otherwise we hit an earlier check
+	check_corrupt_chunk OIDF clear $(printf "000000%02x" $(test_seq 250)) &&
+	cat >expect.err <<-\EOF &&
+	error: commit-graph oid fanout chunk is wrong size
+	error: commit-graph required OID fanout chunk missing or corrupted
+	EOF
+	test_cmp expect.err err
+'
+
+test_expect_success 'reader notices fanout/lookup table mismatch' '
+	check_corrupt_chunk OIDF 1020 "FFFFFFFF" &&
+	cat >expect.err <<-\EOF &&
+	error: commit-graph OID lookup chunk is the wrong size
+	error: commit-graph required OID lookup chunk missing or corrupted
+	EOF
+	test_cmp expect.err err
+'
+
+test_expect_success 'reader notices out-of-bounds fanout' '
+	# Rather than try to corrupt a specific hash, we will just
+	# wreck them all. But we cannot just set them all to 0xFFFFFFFF or
+	# similar, as they are used for hi/lo starts in a binary search (so if
+	# they are identical, that indicates that the search should abort
+	# immediately). Instead, we will give them high values that differ by
+	# 2^24, ensuring that any that are used would cause an out-of-bounds
+	# read.
+	check_corrupt_chunk OIDF 0 $(printf "%02x000000" $(test_seq 0 254)) &&
+	cat >expect.err <<-\EOF &&
+	error: commit-graph fanout values out of order
+	error: commit-graph required OID fanout chunk missing or corrupted
+	EOF
+	test_cmp expect.err err
+'
+
+test_expect_success 'reader notices too-small commit data chunk' '
+	check_corrupt_chunk CDAT clear 00000000 &&
+	cat >expect.err <<-\EOF &&
+	error: commit-graph commit data chunk is wrong size
+	error: commit-graph required commit data chunk missing or corrupted
+	EOF
+	test_cmp expect.err err
+'
+
+test_expect_success 'reader notices out-of-bounds extra edge' '
+	check_corrupt_chunk EDGE clear &&
+	cat >expect.err <<-\EOF &&
+	error: commit-graph extra-edges pointer out of bounds
+	EOF
+	test_cmp expect.err err
+'
+
+test_expect_success 'reader notices too-small generations chunk' '
+	check_corrupt_chunk GDA2 clear 00000000 &&
+	cat >expect.err <<-\EOF &&
+	error: commit-graph generations chunk is wrong size
+	EOF
+	test_cmp expect.err err
+'
+
+test_expect_success 'stale commit cannot be parsed when given directly' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	(
+		cd repo &&
+		test_commit A &&
+		test_commit B &&
+		git commit-graph write --reachable &&
+
+		oid=$(git rev-parse B) &&
+		rm .git/objects/"$(test_oid_to_path "$oid")" &&
+
+		# Verify that it is possible to read the commit from the
+		# commit graph when not being paranoid, ...
+		git rev-list B &&
+		# ... but parsing the commit when double checking that
+		# it actually exists in the object database should fail.
+		test_must_fail env GIT_COMMIT_GRAPH_PARANOIA=true git rev-list -1 B
+	)
+'
+
+test_expect_success 'stale commit cannot be parsed when traversing graph' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	(
+		cd repo &&
+
+		test_commit A &&
+		test_commit B &&
+		test_commit C &&
+		git commit-graph write --reachable &&
+
+		# Corrupt the repository by deleting the intermediate commit
+		# object. Commands should notice that this object is absent and
+		# thus that the repository is corrupt even if the commit graph
+		# exists.
+		oid=$(git rev-parse B) &&
+		rm .git/objects/"$(test_oid_to_path "$oid")" &&
+
+		# Again, we should be able to parse the commit when not
+		# being paranoid about commit graph staleness...
+		git rev-parse HEAD~2 &&
+		# ... but fail when we are paranoid.
+		test_must_fail env GIT_COMMIT_GRAPH_PARANOIA=true git rev-parse HEAD~2 2>error &&
+		grep "error: commit $oid exists in commit-graph but not in the object database" error
 	)
 '
 
diff --git a/t/t5319-multi-pack-index.sh b/t/t5319-multi-pack-index.sh
index 7dfff0f..dd09134 100755
--- a/t/t5319-multi-pack-index.sh
+++ b/t/t5319-multi-pack-index.sh
@@ -2,9 +2,13 @@
 
 test_description='multi-pack-indexes'
 . ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-chunk.sh
 
+GIT_TEST_MULTI_PACK_INDEX=0
 objdir=.git/objects
 
+HASH_LEN=$(test_oid rawsz)
+
 midx_read_expect () {
 	NUM_PACKS=$1
 	NUM_OBJECTS=$2
@@ -13,7 +17,7 @@ midx_read_expect () {
 	EXTRA_CHUNKS="$5"
 	{
 		cat <<-EOF &&
-		header: 4d494458 1 $NUM_CHUNKS $NUM_PACKS
+		header: 4d494458 1 $HASH_LEN $NUM_CHUNKS $NUM_PACKS
 		chunks: pack-names oid-fanout oid-lookup object-offsets$EXTRA_CHUNKS
 		num_objects: $NUM_OBJECTS
 		packs:
@@ -46,7 +50,7 @@ test_expect_success "don't write midx with no packs" '
 	test_path_is_missing pack/multi-pack-index
 '
 
-test_expect_success "Warn if a midx contains no oid" '
+test_expect_success SHA1 'warn if a midx contains no oid' '
 	cp "$TEST_DIRECTORY"/t5319/no-objects.midx $objdir/pack/multi-pack-index &&
 	test_must_fail git multi-pack-index verify &&
 	rm $objdir/pack/multi-pack-index
@@ -90,7 +94,7 @@ test_expect_success 'create objects' '
 	test_commit initial &&
 	for i in $(test_seq 1 5)
 	do
-		generate_objects $i
+		generate_objects $i || return 1
 	done &&
 	commit_and_list_objects
 '
@@ -135,7 +139,7 @@ test_expect_success 'write midx with one v2 pack' '
 
 compare_results_with_midx "one v2 pack"
 
-test_expect_success 'corrupt idx not opened' '
+test_expect_success 'corrupt idx reports errors' '
 	idx=$(test-tool read-midx $objdir | grep "\.idx\$") &&
 	mv $objdir/pack/$idx backup-$idx &&
 	test_when_finished "mv backup-\$idx \$objdir/pack/\$idx" &&
@@ -146,13 +150,13 @@ test_expect_success 'corrupt idx not opened' '
 	test_copy_bytes 1064 <backup-$idx >$objdir/pack/$idx &&
 
 	git -c core.multiPackIndex=true rev-list --objects --all 2>err &&
-	test_must_be_empty err
+	grep "index unavailable" err
 '
 
 test_expect_success 'add more objects' '
 	for i in $(test_seq 6 10)
 	do
-		generate_objects $i
+		generate_objects $i || return 1
 	done &&
 	commit_and_list_objects
 '
@@ -165,18 +169,45 @@ test_expect_success 'write midx with two packs' '
 
 compare_results_with_midx "two packs"
 
+test_expect_success 'write midx with --stdin-packs' '
+	rm -fr $objdir/pack/multi-pack-index &&
+
+	idx="$(find $objdir/pack -name "test-2-*.idx")" &&
+	basename "$idx" >in &&
+
+	git multi-pack-index write --stdin-packs <in &&
+
+	test-tool read-midx $objdir | grep "\.idx$" >packs &&
+
+	test_cmp packs in
+'
+
+compare_results_with_midx "mixed mode (one pack + extra)"
+
+test_expect_success 'write with no objects and preferred pack' '
+	test_when_finished "rm -rf empty" &&
+	git init empty &&
+	test_must_fail git -C empty multi-pack-index write \
+		--stdin-packs --preferred-pack=does-not-exist </dev/null 2>err &&
+	cat >expect <<-EOF &&
+	warning: unknown preferred pack: ${SQ}does-not-exist${SQ}
+	error: no pack files to index.
+	EOF
+	test_cmp expect err
+'
+
 test_expect_success 'write progress off for redirected stderr' '
 	git multi-pack-index --object-dir=$objdir write 2>err &&
 	test_line_count = 0 err
 '
 
 test_expect_success 'write force progress on for stderr' '
-	git multi-pack-index --object-dir=$objdir --progress write 2>err &&
+	GIT_PROGRESS_DELAY=0 git multi-pack-index --object-dir=$objdir write --progress 2>err &&
 	test_file_not_empty err
 '
 
 test_expect_success 'write with the --no-progress option' '
-	git multi-pack-index --object-dir=$objdir --no-progress write 2>err &&
+	GIT_PROGRESS_DELAY=0 git multi-pack-index --object-dir=$objdir write --no-progress 2>err &&
 	test_line_count = 0 err
 '
 
@@ -185,7 +216,7 @@ test_expect_success 'add more packs' '
 	do
 		generate_objects $j &&
 		commit_and_list_objects &&
-		git pack-objects --index-version=2 $objdir/pack/test-pack <obj-list
+		git pack-objects --index-version=2 $objdir/pack/test-pack <obj-list || return 1
 	done
 '
 
@@ -198,6 +229,127 @@ test_expect_success 'write midx with twelve packs' '
 
 compare_results_with_midx "twelve packs"
 
+test_expect_success 'multi-pack-index *.rev cleanup with --object-dir' '
+	git init repo &&
+	git clone -s repo alternate &&
+
+	test_when_finished "rm -rf repo alternate" &&
+
+	(
+		cd repo &&
+		test_commit base &&
+		git repack -d
+	) &&
+
+	ours="alternate/.git/objects/pack/multi-pack-index-123.rev" &&
+	theirs="repo/.git/objects/pack/multi-pack-index-abc.rev" &&
+	touch "$ours" "$theirs" &&
+
+	(
+		cd alternate &&
+		git multi-pack-index --object-dir ../repo/.git/objects write
+	) &&
+
+	# writing a midx in "repo" should not remove the .rev file in the
+	# alternate
+	test_path_is_file repo/.git/objects/pack/multi-pack-index &&
+	test_path_is_file $ours &&
+	test_path_is_missing $theirs
+'
+
+test_expect_success 'warn on improper hash version' '
+	git init --object-format=sha1 sha1 &&
+	(
+		cd sha1 &&
+		git config core.multiPackIndex true &&
+		test_commit 1 &&
+		git repack -a &&
+		git multi-pack-index write &&
+		mv .git/objects/pack/multi-pack-index ../mpi-sha1
+	) &&
+	git init --object-format=sha256 sha256 &&
+	(
+		cd sha256 &&
+		git config core.multiPackIndex true &&
+		test_commit 1 &&
+		git repack -a &&
+		git multi-pack-index write &&
+		mv .git/objects/pack/multi-pack-index ../mpi-sha256
+	) &&
+	(
+		cd sha1 &&
+		mv ../mpi-sha256 .git/objects/pack/multi-pack-index &&
+		git log -1 2>err &&
+		test_grep "multi-pack-index hash version 2 does not match version 1" err
+	) &&
+	(
+		cd sha256 &&
+		mv ../mpi-sha1 .git/objects/pack/multi-pack-index &&
+		git log -1 2>err &&
+		test_grep "multi-pack-index hash version 1 does not match version 2" err
+	)
+'
+
+test_expect_success 'midx picks objects from preferred pack' '
+	test_when_finished rm -rf preferred.git &&
+	git init --bare preferred.git &&
+	(
+		cd preferred.git &&
+
+		a=$(echo "a" | git hash-object -w --stdin) &&
+		b=$(echo "b" | git hash-object -w --stdin) &&
+		c=$(echo "c" | git hash-object -w --stdin) &&
+
+		# Set up two packs, duplicating the object "B" at different
+		# offsets.
+		#
+		# Note that the "BC" pack (the one we choose as preferred) sorts
+		# lexically after the "AB" pack, meaning that omitting the
+		# --preferred-pack argument would cause this test to fail (since
+		# the MIDX code would select the copy of "b" in the "AB" pack).
+		git pack-objects objects/pack/test-AB <<-EOF &&
+		$a
+		$b
+		EOF
+		bc=$(git pack-objects objects/pack/test-BC <<-EOF
+		$b
+		$c
+		EOF
+		) &&
+
+		git multi-pack-index --object-dir=objects \
+			write --preferred-pack=test-BC-$bc.idx 2>err &&
+		test_must_be_empty err &&
+
+		test-tool read-midx --show-objects objects >out &&
+
+		ofs=$(git show-index <objects/pack/test-BC-$bc.idx | grep $b |
+			cut -d" " -f1) &&
+		printf "%s %s\tobjects/pack/test-BC-%s.pack\n" \
+			"$b" "$ofs" "$bc" >expect &&
+		grep ^$b out >actual &&
+
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'preferred packs must be non-empty' '
+	test_when_finished rm -rf preferred.git &&
+	git init preferred.git &&
+	(
+		cd preferred.git &&
+
+		test_commit base &&
+		git repack -ad &&
+
+		empty="$(git pack-objects $objdir/pack/pack </dev/null)" &&
+
+		test_must_fail git multi-pack-index write \
+			--preferred-pack=pack-$empty.pack 2>err &&
+		grep "with no objects" err
+	)
+'
+
 test_expect_success 'verify multi-pack-index success' '
 	git multi-pack-index verify --object-dir=$objdir
 '
@@ -235,7 +387,7 @@ corrupt_midx_and_verify() {
 	printf "$DATA" | dd of="$FILE" bs=1 seek="$POS" conv=notrunc &&
 	test_must_fail $COMMAND 2>test_err &&
 	grep -v "^+" test_err >err &&
-	test_i18ngrep "$GREPSTR" err
+	test_grep "$GREPSTR" err
 }
 
 test_expect_success 'verify bad signature' '
@@ -243,7 +395,6 @@ test_expect_success 'verify bad signature' '
 		"multi-pack-index signature"
 '
 
-HASH_LEN=$(test_oid rawsz)
 NUM_OBJECTS=74
 MIDX_BYTE_VERSION=4
 MIDX_BYTE_OID_VERSION=5
@@ -272,28 +423,28 @@ test_expect_success 'verify bad version' '
 '
 
 test_expect_success 'verify bad OID version' '
-	corrupt_midx_and_verify $MIDX_BYTE_OID_VERSION "\02" $objdir \
+	corrupt_midx_and_verify $MIDX_BYTE_OID_VERSION "\03" $objdir \
 		"hash version"
 '
 
 test_expect_success 'verify truncated chunk count' '
 	corrupt_midx_and_verify $MIDX_BYTE_CHUNK_COUNT "\01" $objdir \
-		"missing required"
+		"final chunk has non-zero id"
 '
 
 test_expect_success 'verify extended chunk count' '
 	corrupt_midx_and_verify $MIDX_BYTE_CHUNK_COUNT "\07" $objdir \
-		"terminating multi-pack-index chunk id appears earlier than expected"
+		"terminating chunk id appears earlier than expected"
 '
 
 test_expect_success 'verify missing required chunk' '
 	corrupt_midx_and_verify $MIDX_BYTE_CHUNK_ID "\01" $objdir \
-		"missing required"
+		"required pack-name chunk missing"
 '
 
 test_expect_success 'verify invalid chunk offset' '
 	corrupt_midx_and_verify $MIDX_BYTE_CHUNK_OFFSET "\01" $objdir \
-		"invalid chunk offset (too large)"
+		"improper chunk offset(s)"
 '
 
 test_expect_success 'verify packnames out of order' '
@@ -329,34 +480,105 @@ test_expect_success 'verify incorrect offset' '
 test_expect_success 'git-fsck incorrect offset' '
 	corrupt_midx_and_verify $MIDX_BYTE_OFFSET "\377" $objdir \
 		"incorrect object offset" \
-		"git -c core.multipackindex=true fsck"
+		"git -c core.multiPackIndex=true fsck" &&
+	test_unconfig core.multiPackIndex &&
+	test_must_fail git fsck &&
+	git -c core.multiPackIndex=false fsck
+'
+
+test_expect_success 'git fsck shows MIDX output with --progress' '
+	git fsck --progress 2>err &&
+	grep "Verifying OID order in multi-pack-index" err &&
+	grep "Verifying object offsets" err
+'
+
+test_expect_success 'git fsck suppresses MIDX output with --no-progress' '
+	git fsck --no-progress 2>err &&
+	! grep "Verifying OID order in multi-pack-index" err &&
+	! grep "Verifying object offsets" err
+'
+
+test_expect_success 'corrupt MIDX is not reused' '
+	corrupt_midx_and_verify $MIDX_BYTE_OFFSET "\377" $objdir \
+		"incorrect object offset" &&
+	git multi-pack-index write 2>err &&
+	test_grep checksum.mismatch err &&
+	git multi-pack-index verify
+'
+
+test_expect_success 'verify incorrect checksum' '
+	pos=$(($(wc -c <$objdir/pack/multi-pack-index) - 10)) &&
+	corrupt_midx_and_verify $pos \
+		"\377\377\377\377\377\377\377\377\377\377" \
+		$objdir "incorrect checksum"
 '
 
 test_expect_success 'repack progress off for redirected stderr' '
-	git multi-pack-index --object-dir=$objdir repack 2>err &&
+	GIT_PROGRESS_DELAY=0 git multi-pack-index --object-dir=$objdir repack 2>err &&
 	test_line_count = 0 err
 '
 
 test_expect_success 'repack force progress on for stderr' '
-	git multi-pack-index --object-dir=$objdir --progress repack 2>err &&
+	GIT_PROGRESS_DELAY=0 git multi-pack-index --object-dir=$objdir repack --progress 2>err &&
 	test_file_not_empty err
 '
 
 test_expect_success 'repack with the --no-progress option' '
-	git multi-pack-index --object-dir=$objdir --no-progress repack 2>err &&
+	GIT_PROGRESS_DELAY=0 git multi-pack-index --object-dir=$objdir repack --no-progress 2>err &&
 	test_line_count = 0 err
 '
 
-test_expect_success 'repack removes multi-pack-index' '
+test_expect_success 'repack removes multi-pack-index when deleting packs' '
 	test_path_is_file $objdir/pack/multi-pack-index &&
-	GIT_TEST_MULTI_PACK_INDEX=0 git repack -adf &&
+	# Set GIT_TEST_MULTI_PACK_INDEX to 0 to avoid writing a new
+	# multi-pack-index after repacking, but set "core.multiPackIndex" to
+	# true so that "git repack" can read the existing MIDX.
+	GIT_TEST_MULTI_PACK_INDEX=0 git -c core.multiPackIndex repack -adf &&
 	test_path_is_missing $objdir/pack/multi-pack-index
 '
 
+test_expect_success 'repack preserves multi-pack-index when creating packs' '
+	git init preserve &&
+	test_when_finished "rm -fr preserve" &&
+	(
+		cd preserve &&
+		packdir=.git/objects/pack &&
+		midx=$packdir/multi-pack-index &&
+
+		test_commit 1 &&
+		pack1=$(git pack-objects --all $packdir/pack) &&
+		touch $packdir/pack-$pack1.keep &&
+		test_commit 2 &&
+		pack2=$(git pack-objects --revs $packdir/pack) &&
+		touch $packdir/pack-$pack2.keep &&
+
+		git multi-pack-index write &&
+		cp $midx $midx.bak &&
+
+		cat >pack-input <<-EOF &&
+		HEAD
+		^HEAD~1
+		EOF
+		test_commit 3 &&
+		pack3=$(git pack-objects --revs $packdir/pack <pack-input) &&
+		test_commit 4 &&
+		pack4=$(git pack-objects --revs $packdir/pack <pack-input) &&
+
+		GIT_TEST_MULTI_PACK_INDEX=0 git -c core.multiPackIndex repack -ad &&
+		ls -la $packdir &&
+		test_path_is_file $packdir/pack-$pack1.pack &&
+		test_path_is_file $packdir/pack-$pack2.pack &&
+		test_path_is_missing $packdir/pack-$pack3.pack &&
+		test_path_is_missing $packdir/pack-$pack4.pack &&
+		test_cmp_bin $midx.bak $midx
+	)
+'
+
 compare_results_with_midx "after repack"
 
 test_expect_success 'multi-pack-index and pack-bitmap' '
-	git -c repack.writeBitmaps=true repack -ad &&
+	GIT_TEST_MULTI_PACK_INDEX_WRITE_BITMAP=0 \
+		git -c repack.writeBitmaps=true repack -ad &&
 	git multi-pack-index write &&
 	git rev-list --test-bitmap HEAD
 '
@@ -399,14 +621,22 @@ test_expect_success 'force some 64-bit offsets with pack-objects' '
 	mkdir objects64/pack &&
 	for i in $(test_seq 1 11)
 	do
-		generate_objects 11
+		generate_objects 11 || return 1
 	done &&
 	commit_and_list_objects &&
 	pack64=$(git pack-objects --index-version=2,0x40 objects64/pack/test-64 <obj-list) &&
 	idx64=objects64/pack/test-64-$pack64.idx &&
 	chmod u+w $idx64 &&
 	corrupt_data $idx64 $(test_oid idxoff) "\02" &&
-	midx64=$(git multi-pack-index --object-dir=objects64 write) &&
+	# objects64 is not a real repository, but can serve as an alternate
+	# anyway so we can write a MIDX into it
+	git init repo &&
+	test_when_finished "rm -fr repo" &&
+	(
+		cd repo &&
+		( cd ../objects64 && pwd ) >.git/objects/info/alternates &&
+		midx64=$(git multi-pack-index --object-dir=../objects64 write)
+	) &&
 	midx_read_expect 1 63 5 objects64 " large-offsets"
 '
 
@@ -435,7 +665,7 @@ test_expect_success 'setup expire tests' '
 		git update-index --add large_file.txt &&
 		for i in $(test_seq 1 20)
 		do
-			test_commit $i
+			test_commit $i || exit 1
 		done &&
 		git branch A HEAD &&
 		git branch B HEAD~8 &&
@@ -487,7 +717,7 @@ test_expect_success 'expire progress off for redirected stderr' '
 test_expect_success 'expire force progress on for stderr' '
 	(
 		cd dup &&
-		git multi-pack-index --progress expire 2>err &&
+		GIT_PROGRESS_DELAY=0 git multi-pack-index expire --progress 2>err &&
 		test_file_not_empty err
 	)
 '
@@ -495,7 +725,7 @@ test_expect_success 'expire force progress on for stderr' '
 test_expect_success 'expire with the --no-progress option' '
 	(
 		cd dup &&
-		git multi-pack-index --no-progress expire 2>err &&
+		GIT_PROGRESS_DELAY=0 git multi-pack-index expire --no-progress 2>err &&
 		test_line_count = 0 err
 	)
 '
@@ -579,6 +809,70 @@ test_expect_success 'repack creates a new pack' '
 	)
 '
 
+test_expect_success 'repack (all) ignores cruft pack' '
+	git init repo &&
+	test_when_finished "rm -fr repo" &&
+	(
+		cd repo &&
+
+		test_commit base &&
+		test_commit --no-tag unreachable &&
+
+		git reset --hard base &&
+		git reflog expire --all --expire=all &&
+		git repack --cruft -d &&
+
+		git multi-pack-index write &&
+
+		find $objdir/pack | sort >before &&
+		git multi-pack-index repack --batch-size=0 &&
+		find $objdir/pack | sort >after &&
+
+		test_cmp before after
+	)
+'
+
+test_expect_success 'repack (--batch-size) ignores cruft pack' '
+	git init repo &&
+	test_when_finished "rm -fr repo" &&
+	(
+		cd repo &&
+
+		test_commit_bulk 5 &&
+		test_commit --no-tag unreachable &&
+
+		git reset --hard HEAD^ &&
+		git reflog expire --all --expire=all &&
+		git repack --cruft -d &&
+
+		test_commit four &&
+
+		find $objdir/pack -type f -name "*.pack" | sort >before &&
+		git repack -d &&
+		find $objdir/pack -type f -name "*.pack" | sort >after &&
+
+		pack="$(comm -13 before after)" &&
+		test_file_size "$pack" >sz &&
+		# Set --batch-size to twice the size of the pack created
+		# in the previous step, since this is enough to
+		# accommodate it and the cruft pack.
+		#
+		# This means that the MIDX machinery *could* combine the
+		# new and cruft packs together.
+		#
+		# We ensure that it does not below.
+		batch="$((($(cat sz) * 2)))" &&
+
+		git multi-pack-index write &&
+
+		find $objdir/pack | sort >before &&
+		git multi-pack-index repack --batch-size=$batch &&
+		find $objdir/pack | sort >after &&
+
+		test_cmp before after
+	)
+'
+
 test_expect_success 'expire removes repacked packs' '
 	(
 		cd dup &&
@@ -634,14 +928,46 @@ test_expect_success 'expire respects .keep files' '
 		PACKA=$(ls .git/objects/pack/a-pack*\.pack | sed s/\.pack\$//) &&
 		touch $PACKA.keep &&
 		git multi-pack-index expire &&
-		ls -S .git/objects/pack/a-pack* | grep $PACKA >a-pack-files &&
-		test_line_count = 3 a-pack-files &&
+		test_path_is_file $PACKA.idx &&
+		test_path_is_file $PACKA.keep &&
+		test_path_is_file $PACKA.pack &&
 		test-tool read-midx .git/objects | grep idx >midx-list &&
 		test_line_count = 2 midx-list
 	)
 '
 
+test_expect_success 'expiring unreferenced cruft pack retains pack' '
+	git init repo &&
+	test_when_finished "rm -fr repo" &&
+	(
+		cd repo &&
+
+		test_commit base &&
+		test_commit --no-tag unreachable &&
+		unreachable=$(git rev-parse HEAD) &&
+
+		git reset --hard base &&
+		git reflog expire --all --expire=all &&
+		git repack --cruft -d &&
+		mtimes="$(ls $objdir/pack/pack-*.mtimes)" &&
+
+		echo "base..$unreachable" >in &&
+		pack="$(git pack-objects --revs --delta-base-offset \
+			$objdir/pack/pack <in)" &&
+
+		# Preferring the contents of "$pack" will leave the
+		# cruft pack unreferenced (ie., none of the objects
+		# contained in the cruft pack will have their MIDX copy
+		# selected from the cruft pack).
+		git multi-pack-index write --preferred-pack="pack-$pack.pack" &&
+		git multi-pack-index expire &&
+
+		test_path_is_file "$mtimes"
+	)
+'
+
 test_expect_success 'repack --batch-size=0 repacks everything' '
+	cp -r dup dup2 &&
 	(
 		cd dup &&
 		rm .git/objects/pack/*.keep &&
@@ -661,4 +987,223 @@ test_expect_success 'repack --batch-size=0 repacks everything' '
 	)
 '
 
+test_expect_success 'repack --batch-size=<large> repacks everything' '
+	(
+		cd dup2 &&
+		rm .git/objects/pack/*.keep &&
+		ls .git/objects/pack/*idx >idx-list &&
+		test_line_count = 2 idx-list &&
+		git multi-pack-index repack --batch-size=2000000 &&
+		ls .git/objects/pack/*idx >idx-list &&
+		test_line_count = 3 idx-list &&
+		test-tool read-midx .git/objects | grep idx >midx-list &&
+		test_line_count = 3 midx-list &&
+		git multi-pack-index expire &&
+		ls -al .git/objects/pack/*idx >idx-list &&
+		test_line_count = 1 idx-list
+	)
+'
+
+test_expect_success 'load reverse index when missing .idx, .pack' '
+	git init repo &&
+	test_when_finished "rm -fr repo" &&
+	(
+		cd repo &&
+
+		git config core.multiPackIndex true &&
+
+		test_commit base &&
+		git repack -ad &&
+		git multi-pack-index write &&
+
+		git rev-parse HEAD >tip &&
+		pack=$(ls .git/objects/pack/pack-*.pack) &&
+		idx=$(ls .git/objects/pack/pack-*.idx) &&
+
+		mv $idx $idx.bak &&
+		git cat-file --batch-check="%(objectsize:disk)" <tip &&
+
+		mv $idx.bak $idx &&
+
+		mv $pack $pack.bak &&
+		git cat-file --batch-check="%(objectsize:disk)" <tip
+	)
+'
+
+test_expect_success 'usage shown without sub-command' '
+	test_expect_code 129 git multi-pack-index 2>err &&
+	! test_grep "unrecognized subcommand" err
+'
+
+test_expect_success 'complains when run outside of a repository' '
+	nongit test_must_fail git multi-pack-index write 2>err &&
+	grep "not a git repository" err
+'
+
+test_expect_success 'repack with delta islands' '
+	git init repo &&
+	test_when_finished "rm -fr repo" &&
+	(
+		cd repo &&
+
+		test_commit first &&
+		git repack &&
+		test_commit second &&
+		git repack &&
+
+		git multi-pack-index write &&
+		git -c repack.useDeltaIslands=true multi-pack-index repack
+	)
+'
+
+corrupt_chunk () {
+	midx=.git/objects/pack/multi-pack-index &&
+	test_when_finished "rm -rf $midx" &&
+	git repack -ad --write-midx &&
+	corrupt_chunk_file $midx "$@"
+}
+
+test_expect_success 'reader notices too-small oid fanout chunk' '
+	corrupt_chunk OIDF clear 00000000 &&
+	test_must_fail git log 2>err &&
+	cat >expect <<-\EOF &&
+	error: multi-pack-index OID fanout is of the wrong size
+	fatal: multi-pack-index required OID fanout chunk missing or corrupted
+	EOF
+	test_cmp expect err
+'
+
+test_expect_success 'reader notices too-small oid lookup chunk' '
+	corrupt_chunk OIDL clear 00000000 &&
+	test_must_fail git log 2>err &&
+	cat >expect <<-\EOF &&
+	error: multi-pack-index OID lookup chunk is the wrong size
+	fatal: multi-pack-index required OID lookup chunk missing or corrupted
+	EOF
+	test_cmp expect err
+'
+
+test_expect_success 'reader notices too-small pack names chunk' '
+	# There is no NUL to terminate the name here, so the
+	# chunk is too short.
+	corrupt_chunk PNAM clear 70656666 &&
+	test_must_fail git log 2>err &&
+	cat >expect <<-\EOF &&
+	fatal: multi-pack-index pack-name chunk is too short
+	EOF
+	test_cmp expect err
+'
+
+test_expect_success 'reader handles unaligned chunks' '
+	# A 9-byte PNAM means all of the subsequent chunks
+	# will no longer be 4-byte aligned, but it is still
+	# a valid one-pack chunk on its own (it is "foo.pack\0").
+	corrupt_chunk PNAM clear 666f6f2e7061636b00 &&
+	git -c core.multipackindex=false log >expect.out &&
+	git -c core.multipackindex=true log >out 2>err &&
+	test_cmp expect.out out &&
+	cat >expect.err <<-\EOF &&
+	error: chunk id 4f494446 not 4-byte aligned
+	EOF
+	test_cmp expect.err err
+'
+
+test_expect_success 'reader notices too-small object offset chunk' '
+	corrupt_chunk OOFF clear 00000000 &&
+	test_must_fail git log 2>err &&
+	cat >expect <<-\EOF &&
+	error: multi-pack-index object offset chunk is the wrong size
+	fatal: multi-pack-index required object offsets chunk missing or corrupted
+	EOF
+	test_cmp expect err
+'
+
+test_expect_success 'reader bounds-checks large offset table' '
+	# re-use the objects64 dir here to cheaply get access to a midx
+	# with large offsets.
+	git init repo &&
+	test_when_finished "rm -rf repo" &&
+	(
+		cd repo &&
+		(cd ../objects64 && pwd) >.git/objects/info/alternates &&
+		git multi-pack-index --object-dir=../objects64 write &&
+		midx=../objects64/pack/multi-pack-index &&
+		corrupt_chunk_file $midx LOFF clear &&
+		# using only %(objectsize) is important here; see the commit
+		# message for more details
+		test_must_fail git cat-file --batch-all-objects \
+			--batch-check="%(objectsize)" 2>err &&
+		cat >expect <<-\EOF &&
+		fatal: multi-pack-index large offset out of bounds
+		EOF
+		test_cmp expect err
+	)
+'
+
+test_expect_success 'reader notices too-small revindex chunk' '
+	# We only get a revindex with bitmaps (and likewise only
+	# load it when they are asked for).
+	test_config repack.writeBitmaps true &&
+	corrupt_chunk RIDX clear 00000000 &&
+	git -c core.multipackIndex=false rev-list \
+		--all --use-bitmap-index >expect.out &&
+	git -c core.multipackIndex=true rev-list \
+		--all --use-bitmap-index >out 2>err &&
+	test_cmp expect.out out &&
+	cat >expect.err <<-\EOF &&
+	error: multi-pack-index reverse-index chunk is the wrong size
+	warning: multi-pack bitmap is missing required reverse index
+	EOF
+	test_cmp expect.err err
+'
+
+test_expect_success 'reader notices out-of-bounds fanout' '
+	# This is similar to the out-of-bounds fanout test in t5318. The values
+	# in adjacent entries should be large but not identical (they
+	# are used as hi/lo starts for a binary search, which would then abort
+	# immediately).
+	corrupt_chunk OIDF 0 $(printf "%02x000000" $(test_seq 0 254)) &&
+	test_must_fail git log 2>err &&
+	cat >expect <<-\EOF &&
+	error: oid fanout out of order: fanout[254] = fe000000 > 5c = fanout[255]
+	fatal: multi-pack-index required OID fanout chunk missing or corrupted
+	EOF
+	test_cmp expect err
+'
+
+test_expect_success 'bitmapped packs are stored via the BTMP chunk' '
+	test_when_finished "rm -fr repo" &&
+	git init repo &&
+	(
+		cd repo &&
+
+		for i in 1 2 3 4 5
+		do
+			test_commit "$i" &&
+			git repack -d || return 1
+		done &&
+
+		find $objdir/pack -type f -name "*.idx" | xargs -n 1 basename |
+		sort >packs &&
+
+		git multi-pack-index write --stdin-packs <packs &&
+		test_must_fail test-tool read-midx --bitmap $objdir 2>err &&
+		cat >expect <<-\EOF &&
+		error: MIDX does not contain the BTMP chunk
+		EOF
+		test_cmp expect err &&
+
+		git multi-pack-index write --stdin-packs --bitmap \
+			--preferred-pack="$(head -n1 <packs)" <packs  &&
+		test-tool read-midx --bitmap $objdir >actual &&
+		for i in $(test_seq $(wc -l <packs))
+		do
+			sed -ne "${i}s/\.idx$/\.pack/p" packs &&
+			echo "  bitmap_pos: $((($i - 1) * 3))" &&
+			echo "  bitmap_nr: 3" || return 1
+		done >expect &&
+		test_cmp expect actual
+	)
+'
+
 test_done
diff --git a/t/t5320-delta-islands.sh b/t/t5320-delta-islands.sh
index fea92a5..4063633 100755
--- a/t/t5320-delta-islands.sh
+++ b/t/t5320-delta-islands.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='exercise delta islands'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # returns true iff $1 is a delta based on $2
@@ -132,7 +134,7 @@ test_expect_success 'island core places core objects first' '
 	    repack -adfi &&
 	git verify-pack -v .git/objects/pack/*.pack |
 	cut -d" " -f1 |
-	egrep "$root|$two" >actual &&
+	grep -E "$root|$two" >actual &&
 	test_cmp expect actual
 '
 
diff --git a/t/t5321-pack-large-objects.sh b/t/t5321-pack-large-objects.sh
index 8a56d98..70770fe 100755
--- a/t/t5321-pack-large-objects.sh
+++ b/t/t5321-pack-large-objects.sh
@@ -6,6 +6,8 @@
 test_description='git pack-object with "large" deltas
 
 '
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-pack.sh
 
diff --git a/t/t5322-pack-objects-sparse.sh b/t/t5322-pack-objects-sparse.sh
index a581eaf..770695c 100755
--- a/t/t5322-pack-objects-sparse.sh
+++ b/t/t5322-pack-objects-sparse.sh
@@ -1,6 +1,10 @@
 #!/bin/sh
 
 test_description='pack-objects object selection using sparse algorithm'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup repo' '
@@ -11,16 +15,16 @@ test_expect_success 'setup repo' '
 		for j in $(test_seq 1 3)
 		do
 			mkdir f$i/f$j &&
-			echo $j >f$i/f$j/data.txt
+			echo $j >f$i/f$j/data.txt || return 1
 		done
 	done &&
 	git add . &&
 	git commit -m "Initialized trees" &&
 	for i in $(test_seq 1 3)
 	do
-		git checkout -b topic$i master &&
+		git checkout -b topic$i main &&
 		echo change-$i >f$i/f$i/data.txt &&
-		git commit -a -m "Changed f$i/f$i/data.txt"
+		git commit -a -m "Changed f$i/f$i/data.txt" || return 1
 	done &&
 	cat >packinput.txt <<-EOF &&
 	topic1
diff --git a/t/t5323-pack-redundant.sh b/t/t5323-pack-redundant.sh
index 6b4d1ca..8dbbcc5 100755
--- a/t/t5323-pack-redundant.sh
+++ b/t/t5323-pack-redundant.sh
@@ -6,7 +6,7 @@
 test_description='Test git pack-redundant
 
 In order to test git-pack-redundant, we will create a number of objects and
-packs in the repository `master.git`. The relationship between packs (P1-P8)
+packs in the repository `main.git`. The relationship between packs (P1-P8)
 and objects (T, A-R) is showed in the following chart. Objects of a pack will
 be marked with letter x, while objects of redundant packs will be marked with
 exclamation point, and redundant pack itself will be marked with asterisk.
@@ -25,7 +25,7 @@ exclamation point, and redundant pack itself will be marked with asterisk.
     ALL | x x x x x x x x x x x x x x x x x x x
 
 Another repository `shared.git` has unique objects (X-Z), while other objects
-(marked with letter s) are shared through alt-odb (of `master.git`). The
+(marked with letter s) are shared through alt-odb (of `main.git`). The
 relationship between packs and objects is as follows:
 
 	| T A B C D E F G H I J K L M N O P Q R   X Y Z
@@ -36,9 +36,11 @@ relationship between packs and objects is as follows:
 
 . ./test-lib.sh
 
-master_repo=master.git
+main_repo=main.git
 shared_repo=shared.git
 
+git_pack_redundant='git pack-redundant --i-still-use-this'
+
 # Create commits in <repo> and assign each commit's oid to shell variables
 # given in the arguments (A, B, and C). E.g.:
 #
@@ -69,7 +71,7 @@ create_commits_in () {
 		shift ||
 		return 1
 	done &&
-	git -C "$repo" update-ref refs/heads/master $oid
+	git -C "$repo" update-ref refs/heads/main $oid
 }
 
 # Create pack in <repo> and assign pack id to variable given in the 2nd argument
@@ -107,9 +109,20 @@ format_packfiles () {
 	sort
 }
 
-test_expect_success 'setup master repo' '
-	git init --bare "$master_repo" &&
-	create_commits_in "$master_repo" A B C D E F G H I J K L M N O P Q R
+test_expect_success 'setup main repo' '
+	git init --bare "$main_repo" &&
+	create_commits_in "$main_repo" A B C D E F G H I J K L M N O P Q R
+'
+
+test_expect_success 'main: pack-redundant works with no packfile' '
+	(
+		cd "$main_repo" &&
+		cat >expect <<-EOF &&
+			fatal: Zero packs found!
+			EOF
+		test_must_fail $git_pack_redundant --all >actual 2>&1 &&
+		test_cmp expect actual
+	)
 '
 
 #############################################################################
@@ -118,14 +131,12 @@ test_expect_success 'setup master repo' '
 #         | T A B C D E F G H I J K L M N O P Q R
 #     ----+--------------------------------------
 #     P1  | x x x x x x x                       x
-#     P2  |     x x x x   x x x
-#     P3  |             x     x x x x x
 #     ----+--------------------------------------
-#     ALL | x x x x x x x x x x x x x x         x
+#     ALL | x x x x x x x                       x
 #
 #############################################################################
-test_expect_success 'master: no redundant for pack 1, 2, 3' '
-	create_pack_in "$master_repo" P1 <<-EOF &&
+test_expect_success 'main: pack-redundant works with one packfile' '
+	create_pack_in "$main_repo" P1 <<-EOF &&
 		$T
 		$A
 		$B
@@ -135,7 +146,27 @@ test_expect_success 'master: no redundant for pack 1, 2, 3' '
 		$F
 		$R
 		EOF
-	create_pack_in "$master_repo" P2 <<-EOF &&
+	(
+		cd "$main_repo" &&
+		$git_pack_redundant --all >out &&
+		test_must_be_empty out
+	)
+'
+
+#############################################################################
+# Chart of packs and objects for this test case
+#
+#         | T A B C D E F G H I J K L M N O P Q R
+#     ----+--------------------------------------
+#     P1  | x x x x x x x                       x
+#     P2  |     x x x x   x x x
+#     P3  |             x     x x x x x
+#     ----+--------------------------------------
+#     ALL | x x x x x x x x x x x x x x         x
+#
+#############################################################################
+test_expect_success 'main: no redundant for pack 1, 2, 3' '
+	create_pack_in "$main_repo" P2 <<-EOF &&
 		$B
 		$C
 		$D
@@ -144,7 +175,7 @@ test_expect_success 'master: no redundant for pack 1, 2, 3' '
 		$H
 		$I
 		EOF
-	create_pack_in "$master_repo" P3 <<-EOF &&
+	create_pack_in "$main_repo" P3 <<-EOF &&
 		$F
 		$I
 		$J
@@ -153,8 +184,8 @@ test_expect_success 'master: no redundant for pack 1, 2, 3' '
 		$M
 		EOF
 	(
-		cd "$master_repo" &&
-		git pack-redundant --all >out &&
+		cd "$main_repo" &&
+		$git_pack_redundant --all >out &&
 		test_must_be_empty out
 	)
 '
@@ -173,26 +204,26 @@ test_expect_success 'master: no redundant for pack 1, 2, 3' '
 #     ALL | x x x x x x x x x x x x x x x x x   x
 #
 #############################################################################
-test_expect_success 'master: one of pack-2/pack-3 is redundant' '
-	create_pack_in "$master_repo" P4 <<-EOF &&
+test_expect_success 'main: one of pack-2/pack-3 is redundant' '
+	create_pack_in "$main_repo" P4 <<-EOF &&
 		$J
 		$K
 		$L
 		$M
 		$P
 		EOF
-	create_pack_in "$master_repo" P5 <<-EOF &&
+	create_pack_in "$main_repo" P5 <<-EOF &&
 		$G
 		$H
 		$N
 		$O
 		EOF
 	(
-		cd "$master_repo" &&
+		cd "$main_repo" &&
 		cat >expect <<-EOF &&
 			P3:$P3
 			EOF
-		git pack-redundant --all >out &&
+		$git_pack_redundant --all >out &&
 		format_packfiles <out >actual &&
 		test_cmp expect actual
 	)
@@ -214,24 +245,24 @@ test_expect_success 'master: one of pack-2/pack-3 is redundant' '
 #     ALL | x x x x x x x x x x x x x x x x x x x
 #
 #############################################################################
-test_expect_success 'master: pack 2, 4, and 6 are redundant' '
-	create_pack_in "$master_repo" P6 <<-EOF &&
+test_expect_success 'main: pack 2, 4, and 6 are redundant' '
+	create_pack_in "$main_repo" P6 <<-EOF &&
 		$N
 		$O
 		$Q
 		EOF
-	create_pack_in "$master_repo" P7 <<-EOF &&
+	create_pack_in "$main_repo" P7 <<-EOF &&
 		$P
 		$Q
 		EOF
 	(
-		cd "$master_repo" &&
+		cd "$main_repo" &&
 		cat >expect <<-EOF &&
 			P2:$P2
 			P4:$P4
 			P6:$P6
 			EOF
-		git pack-redundant --all >out &&
+		$git_pack_redundant --all >out &&
 		format_packfiles <out >actual &&
 		test_cmp expect actual
 	)
@@ -254,57 +285,57 @@ test_expect_success 'master: pack 2, 4, and 6 are redundant' '
 #     ALL | x x x x x x x x x x x x x x x x x x x
 #
 #############################################################################
-test_expect_success 'master: pack-8 (subset of pack-1) is also redundant' '
-	create_pack_in "$master_repo" P8 <<-EOF &&
+test_expect_success 'main: pack-8 (subset of pack-1) is also redundant' '
+	create_pack_in "$main_repo" P8 <<-EOF &&
 		$A
 		EOF
 	(
-		cd "$master_repo" &&
+		cd "$main_repo" &&
 		cat >expect <<-EOF &&
 			P2:$P2
 			P4:$P4
 			P6:$P6
 			P8:$P8
 			EOF
-		git pack-redundant --all >out &&
+		$git_pack_redundant --all >out &&
 		format_packfiles <out >actual &&
 		test_cmp expect actual
 	)
 '
 
-test_expect_success 'master: clean loose objects' '
+test_expect_success 'main: clean loose objects' '
 	(
-		cd "$master_repo" &&
+		cd "$main_repo" &&
 		git prune-packed &&
 		find objects -type f | sed -e "/objects\/pack\//d" >out &&
 		test_must_be_empty out
 	)
 '
 
-test_expect_success 'master: remove redundant packs and pass fsck' '
+test_expect_success 'main: remove redundant packs and pass fsck' '
 	(
-		cd "$master_repo" &&
-		git pack-redundant --all | xargs rm &&
+		cd "$main_repo" &&
+		$git_pack_redundant --all | xargs rm &&
 		git fsck &&
-		git pack-redundant --all >out &&
+		$git_pack_redundant --all >out &&
 		test_must_be_empty out
 	)
 '
 
 # The following test cases will execute inside `shared.git`, instead of
-# inside `master.git`.
+# inside `main.git`.
 test_expect_success 'setup shared.git' '
-	git clone --mirror "$master_repo" "$shared_repo" &&
+	git clone --mirror "$main_repo" "$shared_repo" &&
 	(
 		cd "$shared_repo" &&
-		printf "../../$master_repo/objects\n" >objects/info/alternates
+		printf "../../$main_repo/objects\n" >objects/info/alternates
 	)
 '
 
 test_expect_success 'shared: all packs are redundant, but no output without --alt-odb' '
 	(
 		cd "$shared_repo" &&
-		git pack-redundant --all >out &&
+		$git_pack_redundant --all >out &&
 		test_must_be_empty out
 	)
 '
@@ -312,7 +343,7 @@ test_expect_success 'shared: all packs are redundant, but no output without --al
 #############################################################################
 # Chart of packs and objects for this test case
 #
-#     ================ master.git ===============
+#     ================= main.git ================
 #         | T A B C D E F G H I J K L M N O P Q R  <----------+
 #     ----+--------------------------------------             |
 #     P1  | x x x x x x x                       x             |
@@ -343,7 +374,7 @@ test_expect_success 'shared: show redundant packs in stderr for verbose mode' '
 			P5:$P5
 			P7:$P7
 			EOF
-		git pack-redundant --all --verbose >out 2>out.err &&
+		$git_pack_redundant --all --verbose >out 2>out.err &&
 		test_must_be_empty out &&
 		grep "pack$" out.err | format_packfiles >actual &&
 		test_cmp expect actual
@@ -356,9 +387,9 @@ test_expect_success 'shared: remove redundant packs, no packs left' '
 		cat >expect <<-EOF &&
 			fatal: Zero packs found!
 			EOF
-		git pack-redundant --all --alt-odb | xargs rm &&
+		$git_pack_redundant --all --alt-odb | xargs rm &&
 		git fsck &&
-		test_must_fail git pack-redundant --all --alt-odb >actual 2>&1 &&
+		test_must_fail $git_pack_redundant --all --alt-odb >actual 2>&1 &&
 		test_cmp expect actual
 	)
 '
@@ -386,7 +417,7 @@ test_expect_success 'shared: create new objects and packs' '
 test_expect_success 'shared: no redundant without --alt-odb' '
 	(
 		cd "$shared_repo" &&
-		git pack-redundant --all >out &&
+		$git_pack_redundant --all >out &&
 		test_must_be_empty out
 	)
 '
@@ -394,7 +425,7 @@ test_expect_success 'shared: no redundant without --alt-odb' '
 #############################################################################
 # Chart of packs and objects for this test case
 #
-#     ================ master.git ===============
+#     ================= main.git ================
 #         | T A B C D E F G H I J K L M N O P Q R  <----------------+
 #     ----+--------------------------------------                   |
 #     P1  | x x x x x x x                       x                   |
@@ -417,7 +448,7 @@ test_expect_success 'shared: no redundant without --alt-odb' '
 test_expect_success 'shared: one pack is redundant with --alt-odb' '
 	(
 		cd "$shared_repo" &&
-		git pack-redundant --all --alt-odb >out &&
+		$git_pack_redundant --all --alt-odb >out &&
 		format_packfiles <out >actual &&
 		test_line_count = 1 actual
 	)
@@ -426,7 +457,7 @@ test_expect_success 'shared: one pack is redundant with --alt-odb' '
 #############################################################################
 # Chart of packs and objects for this test case
 #
-#     ================ master.git ===============
+#     ================= main.git ================
 #         | T A B C D E F G H I J K L M N O P Q R  <----------------+
 #     ----+--------------------------------------                   |
 #     P1  | x x x x x x x                       x                   |
@@ -454,7 +485,7 @@ test_expect_success 'shared: ignore unique objects and all two packs are redunda
 			Px1:$Px1
 			Px2:$Px2
 			EOF
-		git pack-redundant --all --alt-odb >out <<-EOF &&
+		$git_pack_redundant --all --alt-odb >out <<-EOF &&
 			$X
 			$Y
 			$Z
diff --git a/t/t5324-split-commit-graph.sh b/t/t5324-split-commit-graph.sh
index ea28d52..281266f 100755
--- a/t/t5324-split-commit-graph.sh
+++ b/t/t5324-split-commit-graph.sh
@@ -1,7 +1,10 @@
 #!/bin/sh
 
 test_description='split commit graph'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-chunk.sh
 
 GIT_TEST_COMMIT_GRAPH=0
 GIT_TEST_COMMIT_GRAPH_CHANGED_PATHS=0
@@ -13,11 +16,14 @@ test_expect_success 'setup repo' '
 	infodir=".git/objects/info" &&
 	graphdir="$infodir/commit-graphs" &&
 	test_oid_cache <<-EOM
-	shallow sha1:1760
-	shallow sha256:2064
+	shallow sha1:2132
+	shallow sha256:2436
+
+	base sha1:1408
+	base sha256:1528
 
-	base sha1:1376
-	base sha256:1496
+	oid_version sha1:1
+	oid_version sha256:2
 	EOM
 '
 
@@ -27,10 +33,16 @@ graph_read_expect() {
 	then
 		NUM_BASE=$2
 	fi
+	OPTIONS=
+	if test -z "$3"
+	then
+		OPTIONS=" read_generation_data"
+	fi
 	cat >expect <<- EOF
-	header: 43475048 1 1 3 $NUM_BASE
+	header: 43475048 1 $(test_oid oid_version) 4 $NUM_BASE
 	num_commits: $1
-	chunks: oid_fanout oid_lookup commit_metadata
+	chunks: oid_fanout oid_lookup commit_metadata generation_data
+	options:$OPTIONS
 	EOF
 	test-tool read-graph >output &&
 	test_cmp expect output
@@ -52,8 +64,8 @@ test_expect_success 'create commits and write commit-graph' '
 '
 
 graph_git_two_modes() {
-	git -c core.commitGraph=true $1 >output
-	git -c core.commitGraph=false $1 >expect
+	git ${2:+ -C "$2"} -c core.commitGraph=true $1 >output &&
+	git ${2:+ -C "$2"} -c core.commitGraph=false $1 >expect &&
 	test_cmp expect output
 }
 
@@ -61,12 +73,13 @@ graph_git_behavior() {
 	MSG=$1
 	BRANCH=$2
 	COMPARE=$3
+	DIR=$4
 	test_expect_success "check normal git operations: $MSG" '
-		graph_git_two_modes "log --oneline $BRANCH" &&
-		graph_git_two_modes "log --topo-order $BRANCH" &&
-		graph_git_two_modes "log --graph $COMPARE..$BRANCH" &&
-		graph_git_two_modes "branch -vv" &&
-		graph_git_two_modes "merge-base -a $BRANCH $COMPARE"
+		graph_git_two_modes "log --oneline $BRANCH" "$DIR" &&
+		graph_git_two_modes "log --topo-order $BRANCH" "$DIR" &&
+		graph_git_two_modes "log --graph $COMPARE..$BRANCH" "$DIR" &&
+		graph_git_two_modes "branch -vv" "$DIR" &&
+		graph_git_two_modes "merge-base -a $BRANCH $COMPARE" "$DIR"
 	'
 }
 
@@ -184,7 +197,10 @@ test_expect_success 'create fork and chain across alternate' '
 	)
 '
 
-graph_git_behavior 'alternate: commit 13 vs 6' commits/13 commits/6
+if test -d fork
+then
+	graph_git_behavior 'alternate: commit 13 vs 6' commits/13 origin/commits/6 "fork"
+fi
 
 test_expect_success 'test merge stragety constants' '
 	git clone . merge-2 &&
@@ -268,7 +284,33 @@ test_expect_success 'verify hashes along chain, even in shallow' '
 		corrupt_file "$base_file" $(test_oid shallow) "\01" &&
 		test_must_fail git commit-graph verify --shallow 2>test_err &&
 		grep -v "^+" test_err >err &&
-		test_i18ngrep "incorrect checksum" err
+		test_grep "incorrect checksum" err
+	)
+'
+
+test_expect_success 'verify notices chain slice which is bogus (base)' '
+	git clone --no-hardlinks . verify-chain-bogus-base &&
+	(
+		cd verify-chain-bogus-base &&
+		git commit-graph verify &&
+		base_file=$graphdir/graph-$(sed -n 1p $graphdir/commit-graph-chain).graph &&
+		echo "garbage" >$base_file &&
+		test_must_fail git commit-graph verify 2>test_err &&
+		grep -v "^+" test_err >err &&
+		grep "commit-graph file is too small" err
+	)
+'
+
+test_expect_success 'verify notices chain slice which is bogus (tip)' '
+	git clone --no-hardlinks . verify-chain-bogus-tip &&
+	(
+		cd verify-chain-bogus-tip &&
+		git commit-graph verify &&
+		tip_file=$graphdir/graph-$(sed -n 2p $graphdir/commit-graph-chain).graph &&
+		echo "garbage" >$tip_file &&
+		test_must_fail git commit-graph verify 2>test_err &&
+		grep -v "^+" test_err >err &&
+		grep "commit-graph file is too small" err
 	)
 '
 
@@ -278,11 +320,11 @@ test_expect_success 'verify --shallow does not check base contents' '
 		cd verify-shallow &&
 		git commit-graph verify &&
 		base_file=$graphdir/graph-$(head -n 1 $graphdir/commit-graph-chain).graph &&
-		corrupt_file "$base_file" 1000 "\01" &&
+		corrupt_file "$base_file" 1500 "\01" &&
 		git commit-graph verify --shallow &&
 		test_must_fail git commit-graph verify 2>test_err &&
 		grep -v "^+" test_err >err &&
-		test_i18ngrep "incorrect checksum" err
+		test_grep "incorrect checksum" err
 	)
 '
 
@@ -293,24 +335,51 @@ test_expect_success 'warn on base graph chunk incorrect' '
 		git commit-graph verify &&
 		base_file=$graphdir/graph-$(tail -n 1 $graphdir/commit-graph-chain).graph &&
 		corrupt_file "$base_file" $(test_oid base) "\01" &&
-		git commit-graph verify --shallow 2>test_err &&
+		test_must_fail git commit-graph verify --shallow 2>test_err &&
 		grep -v "^+" test_err >err &&
-		test_i18ngrep "commit-graph chain does not match" err
+		test_grep "commit-graph chain does not match" err
 	)
 '
 
-test_expect_success 'verify after commit-graph-chain corruption' '
-	git clone --no-hardlinks . verify-chain &&
+test_expect_success 'verify after commit-graph-chain corruption (base)' '
+	git clone --no-hardlinks . verify-chain-base &&
 	(
-		cd verify-chain &&
-		corrupt_file "$graphdir/commit-graph-chain" 60 "G" &&
-		git commit-graph verify 2>test_err &&
+		cd verify-chain-base &&
+		corrupt_file "$graphdir/commit-graph-chain" 30 "G" &&
+		test_must_fail git commit-graph verify 2>test_err &&
 		grep -v "^+" test_err >err &&
-		test_i18ngrep "invalid commit-graph chain" err &&
-		corrupt_file "$graphdir/commit-graph-chain" 60 "A" &&
-		git commit-graph verify 2>test_err &&
+		test_grep "invalid commit-graph chain" err &&
+		corrupt_file "$graphdir/commit-graph-chain" 30 "A" &&
+		test_must_fail git commit-graph verify 2>test_err &&
 		grep -v "^+" test_err >err &&
-		test_i18ngrep "unable to find all commit-graph files" err
+		test_grep "unable to find all commit-graph files" err
+	)
+'
+
+test_expect_success 'verify after commit-graph-chain corruption (tip)' '
+	git clone --no-hardlinks . verify-chain-tip &&
+	(
+		cd verify-chain-tip &&
+		corrupt_file "$graphdir/commit-graph-chain" 70 "G" &&
+		test_must_fail git commit-graph verify 2>test_err &&
+		grep -v "^+" test_err >err &&
+		test_grep "invalid commit-graph chain" err &&
+		corrupt_file "$graphdir/commit-graph-chain" 70 "A" &&
+		test_must_fail git commit-graph verify 2>test_err &&
+		grep -v "^+" test_err >err &&
+		test_grep "unable to find all commit-graph files" err
+	)
+'
+
+test_expect_success 'verify notices too-short chain file' '
+	git clone --no-hardlinks . verify-chain-short &&
+	(
+		cd verify-chain-short &&
+		git commit-graph verify &&
+		echo "garbage" >$graphdir/commit-graph-chain &&
+		test_must_fail git commit-graph verify 2>test_err &&
+		grep -v "^+" test_err >err &&
+		grep "commit-graph chain file too small" err
 	)
 '
 
@@ -325,10 +394,23 @@ test_expect_success 'verify across alternates' '
 		test_commit extra &&
 		git commit-graph write --reachable --split &&
 		tip_file=$graphdir/graph-$(tail -n 1 $graphdir/commit-graph-chain).graph &&
-		corrupt_file "$tip_file" 100 "\01" &&
+		corrupt_file "$tip_file" 1500 "\01" &&
 		test_must_fail git commit-graph verify --shallow 2>test_err &&
 		grep -v "^+" test_err >err &&
-		test_i18ngrep "commit-graph has incorrect fanout value" err
+		test_grep "incorrect checksum" err
+	)
+'
+
+test_expect_success 'reader bounds-checks base-graph chunk' '
+	git clone --no-hardlinks . corrupt-base-chunk &&
+	(
+		cd corrupt-base-chunk &&
+		tip_file=$graphdir/graph-$(tail -n 1 $graphdir/commit-graph-chain).graph &&
+		corrupt_chunk_file "$tip_file" BASE clear 01020304 &&
+		git -c core.commitGraph=false log >expect.out &&
+		git -c core.commitGraph=true log >out 2>err &&
+		test_cmp expect.out out &&
+		grep "commit-graph base graphs chunk is too small" err
 	)
 '
 
@@ -338,8 +420,9 @@ test_expect_success 'add octopus merge' '
 	git branch merge/octopus &&
 	git commit-graph write --reachable --split &&
 	git commit-graph verify --progress 2>err &&
-	test_line_count = 3 err &&
-	test_i18ngrep ! warning err &&
+	test_line_count = 1 err &&
+	grep "Verifying commits in commit graph: 100% (18/18)" err &&
+	test_grep ! warning err &&
 	test_line_count = 3 $graphdir/commit-graph-chain
 '
 
@@ -424,4 +507,215 @@ done <<\EOF
 0600 -r--------
 EOF
 
+test_expect_success '--split=replace with partial Bloom data' '
+	rm -rf $graphdir $infodir/commit-graph &&
+	git reset --hard commits/3 &&
+	git rev-list -1 HEAD~2 >a &&
+	git rev-list -1 HEAD~1 >b &&
+	git commit-graph write --split=no-merge --stdin-commits --changed-paths <a &&
+	git commit-graph write --split=no-merge --stdin-commits <b &&
+	git commit-graph write --split=replace --stdin-commits --changed-paths <c &&
+	ls $graphdir/graph-*.graph >graph-files &&
+	test_line_count = 1 graph-files &&
+	verify_chain_files_exist $graphdir
+'
+
+test_expect_success 'prevent regression for duplicate commits across layers' '
+	git init dup &&
+	git -C dup commit --allow-empty -m one &&
+	git -C dup -c core.commitGraph=false commit-graph write --split=no-merge --reachable 2>err &&
+	test_grep "attempting to write a commit-graph" err &&
+	git -C dup commit-graph write --split=no-merge --reachable &&
+	git -C dup commit --allow-empty -m two &&
+	git -C dup commit-graph write --split=no-merge --reachable &&
+	git -C dup commit --allow-empty -m three &&
+	git -C dup commit-graph write --split --reachable &&
+	git -C dup commit-graph verify
+'
+
+NUM_FIRST_LAYER_COMMITS=64
+NUM_SECOND_LAYER_COMMITS=16
+NUM_THIRD_LAYER_COMMITS=7
+NUM_FOURTH_LAYER_COMMITS=8
+NUM_FIFTH_LAYER_COMMITS=16
+SECOND_LAYER_SEQUENCE_START=$(($NUM_FIRST_LAYER_COMMITS + 1))
+SECOND_LAYER_SEQUENCE_END=$(($SECOND_LAYER_SEQUENCE_START + $NUM_SECOND_LAYER_COMMITS - 1))
+THIRD_LAYER_SEQUENCE_START=$(($SECOND_LAYER_SEQUENCE_END + 1))
+THIRD_LAYER_SEQUENCE_END=$(($THIRD_LAYER_SEQUENCE_START + $NUM_THIRD_LAYER_COMMITS - 1))
+FOURTH_LAYER_SEQUENCE_START=$(($THIRD_LAYER_SEQUENCE_END + 1))
+FOURTH_LAYER_SEQUENCE_END=$(($FOURTH_LAYER_SEQUENCE_START + $NUM_FOURTH_LAYER_COMMITS - 1))
+FIFTH_LAYER_SEQUENCE_START=$(($FOURTH_LAYER_SEQUENCE_END + 1))
+FIFTH_LAYER_SEQUENCE_END=$(($FIFTH_LAYER_SEQUENCE_START + $NUM_FIFTH_LAYER_COMMITS - 1))
+
+# Current split graph chain:
+#
+#     16 commits (No GDAT)
+# ------------------------
+#     64 commits (GDAT)
+#
+test_expect_success 'setup repo for mixed generation commit-graph-chain' '
+	graphdir=".git/objects/info/commit-graphs" &&
+	test_oid_cache <<-EOF &&
+	oid_version sha1:1
+	oid_version sha256:2
+	EOF
+	git init mixed &&
+	(
+		cd mixed &&
+		git config core.commitGraph true &&
+		git config gc.writeCommitGraph false &&
+		for i in $(test_seq $NUM_FIRST_LAYER_COMMITS)
+		do
+			test_commit $i &&
+			git branch commits/$i || return 1
+		done &&
+		git -c commitGraph.generationVersion=2 commit-graph write --reachable --split &&
+		graph_read_expect $NUM_FIRST_LAYER_COMMITS &&
+		test_line_count = 1 $graphdir/commit-graph-chain &&
+		for i in $(test_seq $SECOND_LAYER_SEQUENCE_START $SECOND_LAYER_SEQUENCE_END)
+		do
+			test_commit $i &&
+			git branch commits/$i || return 1
+		done &&
+		git -c commitGraph.generationVersion=1 commit-graph write --reachable --split=no-merge &&
+		test_line_count = 2 $graphdir/commit-graph-chain &&
+		test-tool read-graph >output &&
+		cat >expect <<-EOF &&
+		header: 43475048 1 $(test_oid oid_version) 4 1
+		num_commits: $NUM_SECOND_LAYER_COMMITS
+		chunks: oid_fanout oid_lookup commit_metadata
+		options:
+		EOF
+		test_cmp expect output &&
+		git commit-graph verify &&
+		cat $graphdir/commit-graph-chain
+	)
+'
+
+# The new layer will be added without generation data chunk as it was not
+# present on the layer underneath it.
+#
+#      7 commits (No GDAT)
+# ------------------------
+#     16 commits (No GDAT)
+# ------------------------
+#     64 commits (GDAT)
+#
+test_expect_success 'do not write generation data chunk if not present on existing tip' '
+	git clone mixed mixed-no-gdat &&
+	(
+		cd mixed-no-gdat &&
+		for i in $(test_seq $THIRD_LAYER_SEQUENCE_START $THIRD_LAYER_SEQUENCE_END)
+		do
+			test_commit $i &&
+			git branch commits/$i || return 1
+		done &&
+		git commit-graph write --reachable --split=no-merge &&
+		test_line_count = 3 $graphdir/commit-graph-chain &&
+		test-tool read-graph >output &&
+		cat >expect <<-EOF &&
+		header: 43475048 1 $(test_oid oid_version) 4 2
+		num_commits: $NUM_THIRD_LAYER_COMMITS
+		chunks: oid_fanout oid_lookup commit_metadata
+		options:
+		EOF
+		test_cmp expect output &&
+		git commit-graph verify
+	)
+'
+
+# Number of commits in each layer of the split-commit graph before merge:
+#
+#      8 commits (No GDAT)
+# ------------------------
+#      7 commits (No GDAT)
+# ------------------------
+#     16 commits (No GDAT)
+# ------------------------
+#     64 commits (GDAT)
+#
+# The top two layers are merged and do not have generation data chunk as layer below them does
+# not have generation data chunk.
+#
+#     15 commits (No GDAT)
+# ------------------------
+#     16 commits (No GDAT)
+# ------------------------
+#     64 commits (GDAT)
+#
+test_expect_success 'do not write generation data chunk if the topmost remaining layer does not have generation data chunk' '
+	git clone mixed-no-gdat mixed-merge-no-gdat &&
+	(
+		cd mixed-merge-no-gdat &&
+		for i in $(test_seq $FOURTH_LAYER_SEQUENCE_START $FOURTH_LAYER_SEQUENCE_END)
+		do
+			test_commit $i &&
+			git branch commits/$i || return 1
+		done &&
+		git commit-graph write --reachable --split --size-multiple 1 &&
+		test_line_count = 3 $graphdir/commit-graph-chain &&
+		test-tool read-graph >output &&
+		cat >expect <<-EOF &&
+		header: 43475048 1 $(test_oid oid_version) 4 2
+		num_commits: $(($NUM_THIRD_LAYER_COMMITS + $NUM_FOURTH_LAYER_COMMITS))
+		chunks: oid_fanout oid_lookup commit_metadata
+		options:
+		EOF
+		test_cmp expect output &&
+		git commit-graph verify
+	)
+'
+
+# Number of commits in each layer of the split-commit graph before merge:
+#
+#     16 commits (No GDAT)
+# ------------------------
+#     15 commits (No GDAT)
+# ------------------------
+#     16 commits (No GDAT)
+# ------------------------
+#     64 commits (GDAT)
+#
+# The top three layers are merged and has generation data chunk as the topmost remaining layer
+# has generation data chunk.
+#
+#     47 commits (GDAT)
+# ------------------------
+#     64 commits (GDAT)
+#
+test_expect_success 'write generation data chunk if topmost remaining layer has generation data chunk' '
+	git clone mixed-merge-no-gdat mixed-merge-gdat &&
+	(
+		cd mixed-merge-gdat &&
+		for i in $(test_seq $FIFTH_LAYER_SEQUENCE_START $FIFTH_LAYER_SEQUENCE_END)
+		do
+			test_commit $i &&
+			git branch commits/$i || return 1
+		done &&
+		git commit-graph write --reachable --split --size-multiple 1 &&
+		test_line_count = 2 $graphdir/commit-graph-chain &&
+		test-tool read-graph >output &&
+		cat >expect <<-EOF &&
+		header: 43475048 1 $(test_oid oid_version) 5 1
+		num_commits: $(($NUM_SECOND_LAYER_COMMITS + $NUM_THIRD_LAYER_COMMITS + $NUM_FOURTH_LAYER_COMMITS + $NUM_FIFTH_LAYER_COMMITS))
+		chunks: oid_fanout oid_lookup commit_metadata generation_data
+		options: read_generation_data
+		EOF
+		test_cmp expect output
+	)
+'
+
+test_expect_success 'write generation data chunk when commit-graph chain is replaced' '
+	git clone mixed mixed-replace &&
+	(
+		cd mixed-replace &&
+		git commit-graph write --reachable --split=replace &&
+		test_path_is_file $graphdir/commit-graph-chain &&
+		test_line_count = 1 $graphdir/commit-graph-chain &&
+		verify_chain_files_exist $graphdir &&
+		graph_read_expect $(($NUM_FIRST_LAYER_COMMITS + $NUM_SECOND_LAYER_COMMITS)) &&
+		git commit-graph verify
+	)
+'
+
 test_done
diff --git a/t/t5325-reverse-index.sh b/t/t5325-reverse-index.sh
new file mode 100755
index 0000000..431a603
--- /dev/null
+++ b/t/t5325-reverse-index.sh
@@ -0,0 +1,208 @@
+#!/bin/sh
+
+test_description='on-disk reverse index'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+# The below tests want control over the 'pack.writeReverseIndex' setting
+# themselves to assert various combinations of it with other options.
+sane_unset GIT_TEST_NO_WRITE_REV_INDEX
+
+packdir=.git/objects/pack
+
+test_expect_success 'setup' '
+	test_commit base &&
+
+	test_config pack.writeReverseIndex false &&
+	pack=$(git pack-objects --all $packdir/pack) &&
+	rev=$packdir/pack-$pack.rev &&
+
+	test_path_is_missing $rev
+'
+
+test_index_pack () {
+	rm -f $rev &&
+	conf=$1 &&
+	shift &&
+	# remove the index since Windows won't overwrite an existing file
+	rm $packdir/pack-$pack.idx &&
+	git -c pack.writeReverseIndex=$conf index-pack "$@" \
+		$packdir/pack-$pack.pack
+}
+
+test_expect_success 'index-pack with pack.writeReverseIndex' '
+	test_index_pack "" &&
+	test_path_is_missing $rev &&
+
+	test_index_pack false &&
+	test_path_is_missing $rev &&
+
+	test_index_pack true &&
+	test_path_is_file $rev
+'
+
+test_expect_success 'index-pack with --[no-]rev-index' '
+	for conf in "" true false
+	do
+		test_index_pack "$conf" --rev-index &&
+		test_path_exists $rev &&
+
+		test_index_pack "$conf" --no-rev-index &&
+		test_path_is_missing $rev || return 1
+	done
+'
+
+test_expect_success 'index-pack can verify reverse indexes' '
+	test_when_finished "rm -f $rev" &&
+	test_index_pack true &&
+
+	test_path_is_file $rev &&
+	git index-pack --rev-index --verify $packdir/pack-$pack.pack &&
+
+	# Intentionally corrupt the reverse index.
+	chmod u+w $rev &&
+	printf "xxxx" | dd of=$rev bs=1 count=4 conv=notrunc &&
+
+	test_must_fail git index-pack --rev-index --verify \
+		$packdir/pack-$pack.pack 2>err &&
+	grep "validation error" err
+'
+
+test_expect_success 'index-pack infers reverse index name with -o' '
+	git index-pack --rev-index -o other.idx $packdir/pack-$pack.pack &&
+	test_path_is_file other.idx &&
+	test_path_is_file other.rev
+'
+
+test_expect_success 'pack-objects respects pack.writeReverseIndex' '
+	test_when_finished "rm -fr pack-1-*" &&
+
+	git -c pack.writeReverseIndex= pack-objects --all pack-1 &&
+	test_path_is_missing pack-1-*.rev &&
+
+	git -c pack.writeReverseIndex=false pack-objects --all pack-1 &&
+	test_path_is_missing pack-1-*.rev &&
+
+	git -c pack.writeReverseIndex=true pack-objects --all pack-1 &&
+	test_path_is_file pack-1-*.rev
+'
+
+test_expect_success 'reverse index is not generated when available on disk' '
+	test_index_pack true &&
+	test_path_is_file $rev &&
+
+	git rev-parse HEAD >tip &&
+	GIT_TEST_REV_INDEX_DIE_IN_MEMORY=1 git cat-file \
+		--batch-check="%(objectsize:disk)" <tip
+'
+
+test_expect_success 'reverse index is ignored when pack.readReverseIndex is false' '
+	test_index_pack true &&
+	test_path_is_file $rev &&
+
+	test_config pack.readReverseIndex false &&
+
+	git rev-parse HEAD >tip &&
+	GIT_TEST_REV_INDEX_DIE_ON_DISK=1 git cat-file \
+		--batch-check="%(objectsize:disk)" <tip
+'
+
+test_expect_success 'revindex in-memory vs on-disk' '
+	git init repo &&
+	test_when_finished "rm -fr repo" &&
+	(
+		cd repo &&
+
+		test_commit commit &&
+
+		git rev-list --objects --no-object-names --all >objects &&
+
+		git -c pack.writeReverseIndex=false repack -ad &&
+		test_path_is_missing $packdir/pack-*.rev &&
+		git cat-file --batch-check="%(objectsize:disk) %(objectname)" \
+			<objects >in-core &&
+
+		git -c pack.writeReverseIndex=true repack -ad &&
+		test_path_is_file $packdir/pack-*.rev &&
+		git cat-file --batch-check="%(objectsize:disk) %(objectname)" \
+			<objects >on-disk &&
+
+		test_cmp on-disk in-core
+	)
+'
+
+test_expect_success 'fsck succeeds on good rev-index' '
+	test_when_finished rm -fr repo &&
+	git init repo &&
+	(
+		cd repo &&
+
+		test_commit commit &&
+		git -c pack.writeReverseIndex=true repack -ad &&
+		git fsck 2>err &&
+		test_must_be_empty err
+	)
+'
+
+test_expect_success 'set up rev-index corruption tests' '
+	git init corrupt &&
+	(
+		cd corrupt &&
+
+		test_commit commit &&
+		git -c pack.writeReverseIndex=true repack -ad &&
+
+		revfile=$(ls .git/objects/pack/pack-*.rev) &&
+		chmod a+w $revfile &&
+		cp $revfile $revfile.bak
+	)
+'
+
+corrupt_rev_and_verify () {
+	(
+		pos="$1" &&
+		value="$2" &&
+		error="$3" &&
+
+		cd corrupt &&
+		revfile=$(ls .git/objects/pack/pack-*.rev) &&
+
+		# Reset to original rev-file.
+		cp $revfile.bak $revfile &&
+
+		printf "$value" | dd of=$revfile bs=1 seek="$pos" conv=notrunc &&
+		test_must_fail git fsck 2>err &&
+		grep "$error" err
+	)
+}
+
+test_expect_success 'fsck catches invalid checksum' '
+	revfile=$(ls corrupt/.git/objects/pack/pack-*.rev) &&
+	orig_size=$(wc -c <$revfile) &&
+	hashpos=$((orig_size - 10)) &&
+	corrupt_rev_and_verify $hashpos bogus \
+		"invalid checksum"
+'
+
+test_expect_success 'fsck catches invalid row position' '
+	corrupt_rev_and_verify 14 "\07" \
+		"invalid rev-index position"
+'
+
+test_expect_success 'fsck catches invalid header: magic number' '
+	corrupt_rev_and_verify 1 "\07" \
+		"reverse-index file .* has unknown signature"
+'
+
+test_expect_success 'fsck catches invalid header: version' '
+	corrupt_rev_and_verify 7 "\02" \
+		"reverse-index file .* has unsupported version"
+'
+
+test_expect_success 'fsck catches invalid header: hash function' '
+	corrupt_rev_and_verify 11 "\03" \
+		"reverse-index file .* has unsupported hash id"
+'
+
+test_done
diff --git a/t/t5326-multi-pack-bitmaps.sh b/t/t5326-multi-pack-bitmaps.sh
new file mode 100755
index 0000000..70d1b58
--- /dev/null
+++ b/t/t5326-multi-pack-bitmaps.sh
@@ -0,0 +1,516 @@
+#!/bin/sh
+
+test_description='exercise basic multi-pack bitmap functionality'
+. ./test-lib.sh
+. "${TEST_DIRECTORY}/lib-bitmap.sh"
+
+# We'll be writing our own midx and bitmaps, so avoid getting confused by the
+# automatic ones.
+GIT_TEST_MULTI_PACK_INDEX=0
+GIT_TEST_MULTI_PACK_INDEX_WRITE_BITMAP=0
+
+# This test exercise multi-pack bitmap functionality where the object order is
+# stored and read from a special chunk within the MIDX, so use the default
+# behavior here.
+sane_unset GIT_TEST_MIDX_WRITE_REV
+sane_unset GIT_TEST_MIDX_READ_RIDX
+
+bitmap_reuse_tests() {
+	from=$1
+	to=$2
+	writeLookupTable=false
+
+	for i in $3-${$#}
+	do
+		case $i in
+		"pack.writeBitmapLookupTable") writeLookupTable=true;;
+		esac
+	done
+
+	test_expect_success "setup pack reuse tests ($from -> $to)" '
+		rm -fr repo &&
+		git init repo &&
+		(
+			cd repo &&
+			git config pack.writeBitmapLookupTable '"$writeLookupTable"' &&
+			test_commit_bulk 16 &&
+			git tag old-tip &&
+
+			git config core.multiPackIndex true &&
+			if test "MIDX" = "$from"
+			then
+				git repack -Ad &&
+				git multi-pack-index write --bitmap
+			else
+				git repack -Adb
+			fi
+		)
+	'
+
+	test_expect_success "build bitmap from existing ($from -> $to)" '
+		(
+			cd repo &&
+			git config pack.writeBitmapLookupTable '"$writeLookupTable"' &&
+			test_commit_bulk --id=further 16 &&
+			git tag new-tip &&
+
+			if test "MIDX" = "$to"
+			then
+				git repack -d &&
+				git multi-pack-index write --bitmap
+			else
+				git repack -Adb
+			fi
+		)
+	'
+
+	test_expect_success "verify resulting bitmaps ($from -> $to)" '
+		(
+			cd repo &&
+			git config pack.writeBitmapLookupTable '"$writeLookupTable"' &&
+			git for-each-ref &&
+			git rev-list --test-bitmap refs/tags/old-tip &&
+			git rev-list --test-bitmap refs/tags/new-tip
+		)
+	'
+}
+
+test_midx_bitmap_cases () {
+	writeLookupTable=false
+	writeBitmapLookupTable=
+
+	for i in "$@"
+	do
+		case $i in
+		"pack.writeBitmapLookupTable")
+			writeLookupTable=true
+			writeBitmapLookupTable="$i"
+			;;
+		esac
+	done
+
+	test_expect_success 'setup test_repository' '
+		rm -rf * .git &&
+		git init &&
+		git config pack.writeBitmapLookupTable '"$writeLookupTable"'
+	'
+
+	midx_bitmap_core
+
+	bitmap_reuse_tests 'pack' 'MIDX' "$writeBitmapLookupTable"
+	bitmap_reuse_tests 'MIDX' 'pack' "$writeBitmapLookupTable"
+	bitmap_reuse_tests 'MIDX' 'MIDX' "$writeBitmapLookupTable"
+
+	test_expect_success 'missing object closure fails gracefully' '
+		rm -fr repo &&
+		git init repo &&
+		test_when_finished "rm -fr repo" &&
+		(
+			cd repo &&
+			git config pack.writeBitmapLookupTable '"$writeLookupTable"' &&
+
+			test_commit loose &&
+			test_commit packed &&
+
+			# Do not pass "--revs"; we want a pack without the "loose"
+			# commit.
+			git pack-objects $objdir/pack/pack <<-EOF &&
+			$(git rev-parse packed)
+			EOF
+
+			test_must_fail git multi-pack-index write --bitmap 2>err &&
+			grep "doesn.t have full closure" err &&
+			test_path_is_missing $midx
+		)
+	'
+
+	midx_bitmap_partial_tests
+
+	test_expect_success 'removing a MIDX clears stale bitmaps' '
+		rm -fr repo &&
+		git init repo &&
+		test_when_finished "rm -fr repo" &&
+		(
+			cd repo &&
+			git config pack.writeBitmapLookupTable '"$writeLookupTable"' &&
+			test_commit base &&
+			git repack &&
+			git multi-pack-index write --bitmap &&
+
+			# Write a MIDX and bitmap; remove the MIDX but leave the bitmap.
+			stale_bitmap=$midx-$(midx_checksum $objdir).bitmap &&
+			rm $midx &&
+
+			# Then write a new MIDX.
+			test_commit new &&
+			git repack &&
+			git multi-pack-index write --bitmap &&
+
+			test_path_is_file $midx &&
+			test_path_is_file $midx-$(midx_checksum $objdir).bitmap &&
+			test_path_is_missing $stale_bitmap
+		)
+	'
+
+	test_expect_success 'pack.preferBitmapTips' '
+		git init repo &&
+		test_when_finished "rm -fr repo" &&
+		(
+			cd repo &&
+			git config pack.writeBitmapLookupTable '"$writeLookupTable"' &&
+
+			test_commit_bulk --message="%s" 103 &&
+
+			git log --format="%H" >commits.raw &&
+			sort <commits.raw >commits &&
+
+			git log --format="create refs/tags/%s %H" HEAD >refs &&
+			git update-ref --stdin <refs &&
+
+			git multi-pack-index write --bitmap &&
+			test_path_is_file $midx &&
+			test_path_is_file $midx-$(midx_checksum $objdir).bitmap &&
+
+			test-tool bitmap list-commits | sort >bitmaps &&
+			comm -13 bitmaps commits >before &&
+			test_line_count = 1 before &&
+
+			perl -ne "printf(\"create refs/tags/include/%d \", $.); print" \
+				<before | git update-ref --stdin &&
+
+			rm -fr $midx-$(midx_checksum $objdir).bitmap &&
+			rm -fr $midx &&
+
+			git -c pack.preferBitmapTips=refs/tags/include \
+				multi-pack-index write --bitmap &&
+			test-tool bitmap list-commits | sort >bitmaps &&
+			comm -13 bitmaps commits >after &&
+
+			! test_cmp before after
+		)
+	'
+
+	test_expect_success 'writing a bitmap with --refs-snapshot' '
+		git init repo &&
+		test_when_finished "rm -fr repo" &&
+		(
+			cd repo &&
+			git config pack.writeBitmapLookupTable '"$writeLookupTable"' &&
+
+			test_commit one &&
+			test_commit two &&
+
+			git rev-parse one >snapshot &&
+
+			git repack -ad &&
+
+			# First, write a MIDX which see both refs/tags/one and
+			# refs/tags/two (causing both of those commits to receive
+			# bitmaps).
+			git multi-pack-index write --bitmap &&
+
+			test_path_is_file $midx &&
+			test_path_is_file $midx-$(midx_checksum $objdir).bitmap &&
+
+			test-tool bitmap list-commits | sort >bitmaps &&
+			grep "$(git rev-parse one)" bitmaps &&
+			grep "$(git rev-parse two)" bitmaps &&
+
+			rm -fr $midx-$(midx_checksum $objdir).bitmap &&
+			rm -fr $midx &&
+
+			# Then again, but with a refs snapshot which only sees
+			# refs/tags/one.
+			git multi-pack-index write --bitmap --refs-snapshot=snapshot &&
+
+			test_path_is_file $midx &&
+			test_path_is_file $midx-$(midx_checksum $objdir).bitmap &&
+
+			test-tool bitmap list-commits | sort >bitmaps &&
+			grep "$(git rev-parse one)" bitmaps &&
+			! grep "$(git rev-parse two)" bitmaps
+		)
+	'
+
+	test_expect_success 'write a bitmap with --refs-snapshot (preferred tips)' '
+		git init repo &&
+		test_when_finished "rm -fr repo" &&
+		(
+			cd repo &&
+			git config pack.writeBitmapLookupTable '"$writeLookupTable"' &&
+
+			test_commit_bulk --message="%s" 103 &&
+
+			git log --format="%H" >commits.raw &&
+			sort <commits.raw >commits &&
+
+			git log --format="create refs/tags/%s %H" HEAD >refs &&
+			git update-ref --stdin <refs &&
+
+			git multi-pack-index write --bitmap &&
+			test_path_is_file $midx &&
+			test_path_is_file $midx-$(midx_checksum $objdir).bitmap &&
+
+			test-tool bitmap list-commits | sort >bitmaps &&
+			comm -13 bitmaps commits >before &&
+			test_line_count = 1 before &&
+
+			(
+				grep -vf before commits.raw &&
+				# mark missing commits as preferred
+				sed "s/^/+/" before
+			) >snapshot &&
+
+			rm -fr $midx-$(midx_checksum $objdir).bitmap &&
+			rm -fr $midx &&
+
+			git multi-pack-index write --bitmap --refs-snapshot=snapshot &&
+			test-tool bitmap list-commits | sort >bitmaps &&
+			comm -13 bitmaps commits >after &&
+
+			! test_cmp before after
+		)
+	'
+
+	test_expect_success 'hash-cache values are propagated from pack bitmaps' '
+		rm -fr repo &&
+		git init repo &&
+		test_when_finished "rm -fr repo" &&
+		(
+			cd repo &&
+			git config pack.writeBitmapLookupTable '"$writeLookupTable"' &&
+
+			test_commit base &&
+			test_commit base2 &&
+			git repack -adb &&
+
+			test-tool bitmap dump-hashes >pack.raw &&
+			test_file_not_empty pack.raw &&
+			sort pack.raw >pack.hashes &&
+
+			test_commit new &&
+			git repack &&
+			git multi-pack-index write --bitmap &&
+
+			test-tool bitmap dump-hashes >midx.raw &&
+			sort midx.raw >midx.hashes &&
+
+			# ensure that every namehash in the pack bitmap can be found in
+			# the midx bitmap (i.e., that there are no oid-namehash pairs
+			# unique to the pack bitmap).
+			comm -23 pack.hashes midx.hashes >dropped.hashes &&
+			test_must_be_empty dropped.hashes
+		)
+	'
+
+	test_expect_success 'no .bitmap is written without any objects' '
+		rm -fr repo &&
+		git init repo &&
+		test_when_finished "rm -fr repo" &&
+		(
+			cd repo &&
+			git config pack.writeBitmapLookupTable '"$writeLookupTable"' &&
+
+			empty="$(git pack-objects $objdir/pack/pack </dev/null)" &&
+			cat >packs <<-EOF &&
+			pack-$empty.idx
+			EOF
+
+			git multi-pack-index write --bitmap --stdin-packs \
+				<packs 2>err &&
+
+			grep "bitmap without any objects" err &&
+
+			test_path_is_file $midx &&
+			test_path_is_missing $midx-$(midx_checksum $objdir).bitmap
+		)
+	'
+
+	test_expect_success 'graceful fallback when missing reverse index' '
+		rm -fr repo &&
+		git init repo &&
+		test_when_finished "rm -fr repo" &&
+		(
+			cd repo &&
+			git config pack.writeBitmapLookupTable '"$writeLookupTable"' &&
+
+			test_commit base &&
+
+			# write a pack and MIDX bitmap containing base
+			git repack -adb &&
+			git multi-pack-index write --bitmap &&
+
+			GIT_TEST_MIDX_READ_RIDX=0 \
+				git rev-list --use-bitmap-index HEAD 2>err &&
+			! grep "ignoring extra bitmap file" err
+		)
+	'
+}
+
+test_midx_bitmap_cases
+
+test_midx_bitmap_cases "pack.writeBitmapLookupTable"
+
+test_expect_success 'multi-pack-index write writes lookup table if enabled' '
+	rm -fr repo &&
+	git init repo &&
+	test_when_finished "rm -fr repo" &&
+	(
+		cd repo &&
+		test_commit base &&
+		git config pack.writeBitmapLookupTable true &&
+		git repack -ad &&
+		GIT_TRACE2_EVENT="$(pwd)/trace" \
+			git multi-pack-index write --bitmap &&
+		grep "\"label\":\"writing_lookup_table\"" trace
+	)
+'
+
+test_expect_success 'preferred pack change with existing MIDX bitmap' '
+	git init preferred-pack-with-existing &&
+	(
+		cd preferred-pack-with-existing &&
+
+		test_commit base &&
+		test_commit other &&
+
+		git rev-list --objects --no-object-names base >p1.objects &&
+		git rev-list --objects --no-object-names other >p2.objects &&
+
+		p1="$(git pack-objects "$objdir/pack/pack" \
+			--delta-base-offset <p1.objects)" &&
+		p2="$(git pack-objects "$objdir/pack/pack" \
+			--delta-base-offset <p2.objects)" &&
+
+		# Generate a MIDX containing the first two packs,
+		# marking p1 as preferred, and ensure that it can be
+		# successfully cloned.
+		git multi-pack-index write --bitmap \
+			--preferred-pack="pack-$p1.pack" &&
+		test_path_is_file $midx &&
+		test_path_is_file $midx-$(midx_checksum $objdir).bitmap &&
+		git clone --no-local . clone1 &&
+
+		# Then generate a new pack which sorts ahead of any
+		# existing pack (by tweaking the pack prefix).
+		test_commit foo &&
+		git pack-objects --all --unpacked $objdir/pack/pack0 &&
+
+		# Generate a new MIDX which changes the preferred pack
+		# to a pack contained in the existing MIDX.
+		git multi-pack-index write --bitmap \
+			--preferred-pack="pack-$p2.pack" &&
+		test_path_is_file $midx &&
+		test_path_is_file $midx-$(midx_checksum $objdir).bitmap &&
+
+		# When the above circumstances are met, the preferred
+		# pack should change appropriately and clones should
+		# (still) succeed.
+		git clone --no-local . clone2
+	)
+'
+
+test_expect_success 'tagged commits are selected for bitmapping' '
+	rm -fr repo &&
+	git init repo &&
+	test_when_finished "rm -fr repo" &&
+	(
+		cd repo &&
+
+		test_commit --annotate base &&
+		git repack -d &&
+
+		# Remove refs/heads/main which points at the commit directly,
+		# leaving only a reference to the annotated tag.
+		git branch -M main &&
+		git checkout base &&
+		git branch -d main &&
+
+		git multi-pack-index write --bitmap &&
+
+		git rev-parse HEAD >want &&
+		test-tool bitmap list-commits >actual &&
+		grep $(cat want) actual
+	)
+'
+
+corrupt_file () {
+	chmod a+w "$1" &&
+	printf "bogus" | dd of="$1" bs=1 seek="12" conv=notrunc
+}
+
+test_expect_success 'git fsck correctly identifies good and bad bitmaps' '
+	git init valid &&
+	test_when_finished rm -rf valid &&
+
+	test_commit_bulk 20 &&
+	git repack -adbf &&
+
+	# Move pack-bitmap aside so it is not deleted
+	# in next repack.
+	packbitmap=$(ls .git/objects/pack/pack-*.bitmap) &&
+	mv "$packbitmap" "$packbitmap.bak" &&
+
+	test_commit_bulk 10 &&
+	git repack -b --write-midx &&
+	midxbitmap=$(ls .git/objects/pack/multi-pack-index-*.bitmap) &&
+
+	# Copy MIDX bitmap to backup. Copy pack bitmap from backup.
+	cp "$midxbitmap" "$midxbitmap.bak" &&
+	cp "$packbitmap.bak" "$packbitmap" &&
+
+	# fsck works at first
+	git fsck 2>err &&
+	test_must_be_empty err &&
+
+	corrupt_file "$packbitmap" &&
+	test_must_fail git fsck 2>err &&
+	grep "bitmap file '\''$packbitmap'\'' has invalid checksum" err &&
+
+	cp "$packbitmap.bak" "$packbitmap" &&
+	corrupt_file "$midxbitmap" &&
+	test_must_fail git fsck 2>err &&
+	grep "bitmap file '\''$midxbitmap'\'' has invalid checksum" err &&
+
+	corrupt_file "$packbitmap" &&
+	test_must_fail git fsck 2>err &&
+	grep "bitmap file '\''$midxbitmap'\'' has invalid checksum" err &&
+	grep "bitmap file '\''$packbitmap'\'' has invalid checksum" err
+'
+
+test_expect_success 'corrupt MIDX with bitmap causes fallback' '
+	git init corrupt-midx-bitmap &&
+	(
+		cd corrupt-midx-bitmap &&
+
+		test_commit first &&
+		git repack -d &&
+		test_commit second &&
+		git repack -d &&
+
+		git multi-pack-index write --bitmap &&
+		checksum=$(midx_checksum $objdir) &&
+		for f in $midx $midx-$checksum.bitmap
+		do
+			mv $f $f.bak || return 1
+		done &&
+
+		# pack everything together, invalidating the MIDX
+		git repack -ad &&
+		# then restore the now-stale MIDX
+		for f in $midx $midx-$checksum.bitmap
+		do
+			mv $f.bak $f || return 1
+		done &&
+
+		git rev-list --count --objects --use-bitmap-index HEAD >out 2>err &&
+		# should attempt opening the broken pack twice (once
+		# from the attempt to load it via the stale bitmap, and
+		# again when attempting to load it from the stale MIDX)
+		# before falling back to the non-MIDX case
+		test 2 -eq $(grep -c "could not open pack" err) &&
+		test 6 -eq $(cat out)
+	)
+'
+
+test_done
diff --git a/t/t5327-multi-pack-bitmaps-rev.sh b/t/t5327-multi-pack-bitmaps-rev.sh
new file mode 100755
index 0000000..e65e311
--- /dev/null
+++ b/t/t5327-multi-pack-bitmaps-rev.sh
@@ -0,0 +1,43 @@
+#!/bin/sh
+
+test_description='exercise basic multi-pack bitmap functionality (.rev files)'
+
+. ./test-lib.sh
+. "${TEST_DIRECTORY}/lib-bitmap.sh"
+
+# We'll be writing our own midx and bitmaps, so avoid getting confused by the
+# automatic ones.
+GIT_TEST_MULTI_PACK_INDEX=0
+GIT_TEST_MULTI_PACK_INDEX_WRITE_BITMAP=0
+
+# Unlike t5326, this test exercise multi-pack bitmap functionality where the
+# object order is stored in a separate .rev file.
+GIT_TEST_MIDX_WRITE_REV=1
+GIT_TEST_MIDX_READ_RIDX=0
+export GIT_TEST_MIDX_WRITE_REV
+export GIT_TEST_MIDX_READ_RIDX
+
+test_midx_bitmap_rev () {
+	writeLookupTable=false
+
+	for i in "$@"
+	do
+		case $i in
+		"pack.writeBitmapLookupTable") writeLookupTable=true;;
+		esac
+	done
+
+	test_expect_success 'setup bitmap config' '
+		rm -rf * .git &&
+		git init &&
+		git config pack.writeBitmapLookupTable '"$writeLookupTable"'
+	'
+
+	midx_bitmap_core rev
+	midx_bitmap_partial_tests rev
+}
+
+test_midx_bitmap_rev
+test_midx_bitmap_rev "pack.writeBitmapLookupTable"
+
+test_done
diff --git a/t/t5328-commit-graph-64bit-time.sh b/t/t5328-commit-graph-64bit-time.sh
new file mode 100755
index 0000000..fc6a242
--- /dev/null
+++ b/t/t5328-commit-graph-64bit-time.sh
@@ -0,0 +1,87 @@
+#!/bin/sh
+
+test_description='commit graph with 64-bit timestamps'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+if ! test_have_prereq TIME_IS_64BIT || ! test_have_prereq TIME_T_IS_64BIT
+then
+	skip_all='skipping 64-bit timestamp tests'
+	test_done
+fi
+
+. "$TEST_DIRECTORY"/lib-commit-graph.sh
+. "$TEST_DIRECTORY/lib-chunk.sh"
+
+UNIX_EPOCH_ZERO="@0 +0000"
+FUTURE_DATE="@4147483646 +0000"
+
+GIT_TEST_COMMIT_GRAPH_CHANGED_PATHS=0
+
+test_expect_success 'lower layers have overflow chunk' '
+	rm -f .git/objects/info/commit-graph &&
+	test_commit --date "$FUTURE_DATE" future-1 &&
+	test_commit --date "$UNIX_EPOCH_ZERO" old-1 &&
+	git commit-graph write --reachable &&
+	test_commit --date "$FUTURE_DATE" future-2 &&
+	test_commit --date "$UNIX_EPOCH_ZERO" old-2 &&
+	git commit-graph write --reachable --split=no-merge &&
+	test_commit extra &&
+	git commit-graph write --reachable --split=no-merge &&
+	git commit-graph write --reachable &&
+	graph_read_expect 5 "generation_data generation_data_overflow" &&
+	mv .git/objects/info/commit-graph commit-graph-upgraded &&
+	git commit-graph write --reachable &&
+	graph_read_expect 5 "generation_data generation_data_overflow" &&
+	test_cmp .git/objects/info/commit-graph commit-graph-upgraded
+'
+
+graph_git_behavior 'overflow' '' HEAD~2 HEAD
+
+test_expect_success 'set up and verify repo with generation data overflow chunk' '
+	git init repo &&
+	(
+		cd repo &&
+		test_commit --date "$UNIX_EPOCH_ZERO" 1 &&
+		test_commit 2 &&
+		test_commit --date "$UNIX_EPOCH_ZERO" 3 &&
+		git commit-graph write --reachable &&
+		graph_read_expect 3 generation_data &&
+		test_commit --date "$FUTURE_DATE" 4 &&
+		test_commit 5 &&
+		test_commit --date "$UNIX_EPOCH_ZERO" 6 &&
+		git branch left &&
+		git reset --hard 3 &&
+		test_commit 7 &&
+		test_commit --date "$FUTURE_DATE" 8 &&
+		test_commit 9 &&
+		git branch right &&
+		git reset --hard 3 &&
+		test_merge M left right &&
+		git commit-graph write --reachable &&
+		graph_read_expect 10 "generation_data generation_data_overflow" &&
+		git commit-graph verify
+	)
+'
+
+graph_git_behavior 'overflow 2' repo left right
+
+test_expect_success 'single commit with generation data exceeding UINT32_MAX' '
+	git init repo-uint32-max &&
+	test_commit -C repo-uint32-max --date "@4294967297 +0000" 1 &&
+	git -C repo-uint32-max commit-graph write --reachable &&
+	graph_read_expect -C repo-uint32-max 1 "generation_data" &&
+	git -C repo-uint32-max commit-graph verify
+'
+
+test_expect_success 'reader notices out-of-bounds generation overflow' '
+	graph=.git/objects/info/commit-graph &&
+	test_when_finished "rm -rf $graph" &&
+	git commit-graph write --reachable &&
+	corrupt_chunk_file $graph GDO2 clear &&
+	test_must_fail git log 2>err &&
+	grep "commit-graph overflow generation data is too small" err
+'
+
+test_done
diff --git a/t/t5329-pack-objects-cruft.sh b/t/t5329-pack-objects-cruft.sh
new file mode 100755
index 0000000..fc5fedb
--- /dev/null
+++ b/t/t5329-pack-objects-cruft.sh
@@ -0,0 +1,947 @@
+#!/bin/sh
+
+test_description='cruft pack related pack-objects tests'
+. ./test-lib.sh
+
+objdir=.git/objects
+packdir=$objdir/pack
+
+basic_cruft_pack_tests () {
+	expire="$1"
+
+	test_expect_success "unreachable loose objects are packed (expire $expire)" '
+		git init repo &&
+		test_when_finished "rm -fr repo" &&
+		(
+			cd repo &&
+
+			test_commit base &&
+			git repack -Ad &&
+			test_commit loose &&
+
+			test-tool chmtime +2000 "$objdir/$(test_oid_to_path \
+				$(git rev-parse loose:loose.t))" &&
+			test-tool chmtime +1000 "$objdir/$(test_oid_to_path \
+				$(git rev-parse loose^{tree}))" &&
+
+			(
+				git rev-list --objects --no-object-names base..loose |
+				while read oid
+				do
+					path="$objdir/$(test_oid_to_path "$oid")" &&
+					printf "%s %d\n" "$oid" "$(test-tool chmtime --get "$path")" ||
+					echo "object list generation failed for $oid"
+				done |
+				sort -k1
+			) >expect &&
+
+			keep="$(basename "$(ls $packdir/pack-*.pack)")" &&
+			cruft="$(echo $keep | git pack-objects --cruft \
+				--cruft-expiration="$expire" $packdir/pack)" &&
+			test-tool pack-mtimes "pack-$cruft.mtimes" >actual &&
+
+			test_cmp expect actual
+		)
+	'
+
+	test_expect_success "unreachable packed objects are packed (expire $expire)" '
+		git init repo &&
+		test_when_finished "rm -fr repo" &&
+		(
+			cd repo &&
+
+			test_commit packed &&
+			git repack -Ad &&
+			test_commit other &&
+
+			git rev-list --objects --no-object-names packed.. >objects &&
+			keep="$(basename "$(ls $packdir/pack-*.pack)")" &&
+			other="$(git pack-objects --delta-base-offset \
+				$packdir/pack <objects)" &&
+			git prune-packed &&
+
+			test-tool chmtime --get -100 "$packdir/pack-$other.pack" >expect &&
+
+			cruft="$(git pack-objects --cruft --cruft-expiration="$expire" $packdir/pack <<-EOF
+			$keep
+			-pack-$other.pack
+			EOF
+			)" &&
+			test-tool pack-mtimes "pack-$cruft.mtimes" >actual.raw &&
+
+			cut -d" " -f2 <actual.raw | sort -u >actual &&
+
+			test_cmp expect actual
+		)
+	'
+
+	test_expect_success "unreachable cruft objects are repacked (expire $expire)" '
+		git init repo &&
+		test_when_finished "rm -fr repo" &&
+		(
+			cd repo &&
+
+			test_commit packed &&
+			git repack -Ad &&
+			test_commit other &&
+
+			git rev-list --objects --no-object-names packed.. >objects &&
+			keep="$(basename "$(ls $packdir/pack-*.pack)")" &&
+
+			cruft_a="$(echo $keep | git pack-objects --cruft --cruft-expiration="$expire" $packdir/pack)" &&
+			git prune-packed &&
+			cruft_b="$(git pack-objects --cruft --cruft-expiration="$expire" $packdir/pack <<-EOF
+			$keep
+			-pack-$cruft_a.pack
+			EOF
+			)" &&
+
+			test-tool pack-mtimes "pack-$cruft_a.mtimes" >expect.raw &&
+			test-tool pack-mtimes "pack-$cruft_b.mtimes" >actual.raw &&
+
+			sort <expect.raw >expect &&
+			sort <actual.raw >actual &&
+
+			test_cmp expect actual
+		)
+	'
+
+	test_expect_success "multiple cruft packs (expire $expire)" '
+		git init repo &&
+		test_when_finished "rm -fr repo" &&
+		(
+			cd repo &&
+
+			test_commit reachable &&
+			git repack -Ad &&
+			keep="$(basename "$(ls $packdir/pack-*.pack)")" &&
+
+			test_commit cruft &&
+			loose="$objdir/$(test_oid_to_path $(git rev-parse cruft))" &&
+
+			# generate three copies of the cruft object in different
+			# cruft packs, each with a unique mtime:
+			#   - one expired (1000 seconds ago)
+			#   - two non-expired (one 1000 seconds in the future,
+			#     one 1500 seconds in the future)
+			test-tool chmtime =-1000 "$loose" &&
+			git pack-objects --cruft $packdir/pack-A <<-EOF &&
+			$keep
+			EOF
+			test-tool chmtime =+1000 "$loose" &&
+			git pack-objects --cruft $packdir/pack-B <<-EOF &&
+			$keep
+			-$(basename $(ls $packdir/pack-A-*.pack))
+			EOF
+			test-tool chmtime =+1500 "$loose" &&
+			git pack-objects --cruft $packdir/pack-C <<-EOF &&
+			$keep
+			-$(basename $(ls $packdir/pack-A-*.pack))
+			-$(basename $(ls $packdir/pack-B-*.pack))
+			EOF
+
+			# ensure the resulting cruft pack takes the most recent
+			# mtime among all copies
+			cruft="$(git pack-objects --cruft \
+				--cruft-expiration="$expire" \
+				$packdir/pack <<-EOF
+			$keep
+			-$(basename $(ls $packdir/pack-A-*.pack))
+			-$(basename $(ls $packdir/pack-B-*.pack))
+			-$(basename $(ls $packdir/pack-C-*.pack))
+			EOF
+			)" &&
+
+			test-tool pack-mtimes "$(basename $(ls $packdir/pack-C-*.mtimes))" >expect.raw &&
+			test-tool pack-mtimes "pack-$cruft.mtimes" >actual.raw &&
+
+			sort expect.raw >expect &&
+			sort actual.raw >actual &&
+			test_cmp expect actual
+		)
+	'
+
+	test_expect_success "cruft packs tolerate missing trees (expire $expire)" '
+		git init repo &&
+		test_when_finished "rm -fr repo" &&
+		(
+			cd repo &&
+
+			test_commit reachable &&
+			test_commit cruft &&
+
+			tree="$(git rev-parse cruft^{tree})" &&
+
+			git reset --hard reachable &&
+			git tag -d cruft &&
+			git reflog expire --all --expire=all &&
+
+			# remove the unreachable tree, but leave the commit
+			# which has it as its root tree intact
+			rm -fr "$objdir/$(test_oid_to_path "$tree")" &&
+
+			git repack -Ad &&
+			basename $(ls $packdir/pack-*.pack) >in &&
+			git pack-objects --cruft --cruft-expiration="$expire" \
+				$packdir/pack <in
+		)
+	'
+
+	test_expect_success "cruft packs tolerate missing blobs (expire $expire)" '
+		git init repo &&
+		test_when_finished "rm -fr repo" &&
+		(
+			cd repo &&
+
+			test_commit reachable &&
+			test_commit cruft &&
+
+			blob="$(git rev-parse cruft:cruft.t)" &&
+
+			git reset --hard reachable &&
+			git tag -d cruft &&
+			git reflog expire --all --expire=all &&
+
+			# remove the unreachable blob, but leave the commit (and
+			# the root tree of that commit) intact
+			rm -fr "$objdir/$(test_oid_to_path "$blob")" &&
+
+			git repack -Ad &&
+			basename $(ls $packdir/pack-*.pack) >in &&
+			git pack-objects --cruft --cruft-expiration="$expire" \
+				$packdir/pack <in
+		)
+	'
+}
+
+basic_cruft_pack_tests never
+basic_cruft_pack_tests 2.weeks.ago
+
+test_expect_success 'cruft tags rescue tagged objects' '
+	git init repo &&
+	test_when_finished "rm -fr repo" &&
+	(
+		cd repo &&
+
+		test_commit packed &&
+		git repack -Ad &&
+
+		test_commit tagged &&
+		git tag -a annotated -m tag &&
+
+		git rev-list --objects --no-object-names packed.. >objects &&
+		while read oid
+		do
+			test-tool chmtime -1000 \
+				"$objdir/$(test_oid_to_path $oid)" || exit 1
+		done <objects &&
+
+		test-tool chmtime -500 \
+			"$objdir/$(test_oid_to_path $(git rev-parse annotated))" &&
+
+		keep="$(basename "$(ls $packdir/pack-*.pack)")" &&
+		cruft="$(echo $keep | git pack-objects --cruft \
+			--cruft-expiration=750.seconds.ago \
+			$packdir/pack)" &&
+		test-tool pack-mtimes "pack-$cruft.mtimes" >actual.raw &&
+		cut -f1 -d" " <actual.raw | sort >actual &&
+
+		(
+			cat objects &&
+			git rev-parse annotated
+		) >expect.raw &&
+		sort <expect.raw >expect &&
+
+		test_cmp expect actual &&
+		cat actual
+	)
+'
+
+test_expect_success 'cruft commits rescue parents, trees' '
+	git init repo &&
+	test_when_finished "rm -fr repo" &&
+	(
+		cd repo &&
+
+		test_commit packed &&
+		git repack -Ad &&
+
+		test_commit old &&
+		test_commit new &&
+
+		git rev-list --objects --no-object-names packed..new >objects &&
+		while read object
+		do
+			test-tool chmtime -1000 \
+				"$objdir/$(test_oid_to_path $object)" || exit 1
+		done <objects &&
+		test-tool chmtime +500 "$objdir/$(test_oid_to_path \
+			$(git rev-parse HEAD))" &&
+
+		keep="$(basename "$(ls $packdir/pack-*.pack)")" &&
+		cruft="$(echo $keep | git pack-objects --cruft \
+			--cruft-expiration=750.seconds.ago \
+			$packdir/pack)" &&
+		test-tool pack-mtimes "pack-$cruft.mtimes" >actual.raw &&
+
+		cut -d" " -f1 <actual.raw | sort >actual &&
+		sort <objects >expect &&
+
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'cruft trees rescue sub-trees, blobs' '
+	git init repo &&
+	test_when_finished "rm -fr repo" &&
+	(
+		cd repo &&
+
+		test_commit packed &&
+		git repack -Ad &&
+
+		mkdir -p dir/sub &&
+		echo foo >foo &&
+		echo bar >dir/bar &&
+		echo baz >dir/sub/baz &&
+
+		test_tick &&
+		git add . &&
+		git commit -m "pruned" &&
+
+		test-tool chmtime -1000 "$objdir/$(test_oid_to_path $(git rev-parse HEAD))" &&
+		test-tool chmtime -1000 "$objdir/$(test_oid_to_path $(git rev-parse HEAD^{tree}))" &&
+		test-tool chmtime -1000 "$objdir/$(test_oid_to_path $(git rev-parse HEAD:foo))" &&
+		test-tool chmtime  -500 "$objdir/$(test_oid_to_path $(git rev-parse HEAD:dir))" &&
+		test-tool chmtime -1000 "$objdir/$(test_oid_to_path $(git rev-parse HEAD:dir/bar))" &&
+		test-tool chmtime -1000 "$objdir/$(test_oid_to_path $(git rev-parse HEAD:dir/sub))" &&
+		test-tool chmtime -1000 "$objdir/$(test_oid_to_path $(git rev-parse HEAD:dir/sub/baz))" &&
+
+		keep="$(basename "$(ls $packdir/pack-*.pack)")" &&
+		cruft="$(echo $keep | git pack-objects --cruft \
+			--cruft-expiration=750.seconds.ago \
+			$packdir/pack)" &&
+		test-tool pack-mtimes "pack-$cruft.mtimes" >actual.raw &&
+		cut -f1 -d" " <actual.raw | sort >actual &&
+
+		git rev-parse HEAD:dir HEAD:dir/bar HEAD:dir/sub HEAD:dir/sub/baz >expect.raw &&
+		sort <expect.raw >expect &&
+
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'expired objects are pruned' '
+	git init repo &&
+	test_when_finished "rm -fr repo" &&
+	(
+		cd repo &&
+
+		test_commit packed &&
+		git repack -Ad &&
+
+		test_commit pruned &&
+
+		git rev-list --objects --no-object-names packed..pruned >objects &&
+		while read object
+		do
+			test-tool chmtime -1000 \
+				"$objdir/$(test_oid_to_path $object)" || exit 1
+		done <objects &&
+
+		keep="$(basename "$(ls $packdir/pack-*.pack)")" &&
+		cruft="$(echo $keep | git pack-objects --cruft \
+			--cruft-expiration=750.seconds.ago \
+			$packdir/pack)" &&
+
+		test-tool pack-mtimes "pack-$cruft.mtimes" >actual &&
+		test_must_be_empty actual
+	)
+'
+
+test_expect_success 'repack --cruft generates a cruft pack' '
+	git init repo &&
+	test_when_finished "rm -fr repo" &&
+	(
+		cd repo &&
+
+		test_commit reachable &&
+		git branch -M main &&
+		git checkout --orphan other &&
+		test_commit unreachable &&
+
+		git checkout main &&
+		git branch -D other &&
+		git tag -d unreachable &&
+		# objects are not cruft if they are contained in the reflogs
+		git reflog expire --all --expire=all &&
+
+		git rev-list --objects --all --no-object-names >reachable.raw &&
+		git cat-file --batch-all-objects --batch-check="%(objectname)" >objects &&
+		sort <reachable.raw >reachable &&
+		comm -13 reachable objects >unreachable &&
+
+		git repack --cruft -d &&
+
+		cruft=$(basename $(ls $packdir/pack-*.mtimes) .mtimes) &&
+		pack=$(basename $(ls $packdir/pack-*.pack | grep -v $cruft) .pack) &&
+
+		git show-index <$packdir/$pack.idx >actual.raw &&
+		cut -f2 -d" " actual.raw | sort >actual &&
+		test_cmp reachable actual &&
+
+		git show-index <$packdir/$cruft.idx >actual.raw &&
+		cut -f2 -d" " actual.raw | sort >actual &&
+		test_cmp unreachable actual
+	)
+'
+
+test_expect_success 'loose objects mtimes upsert others' '
+	git init repo &&
+	test_when_finished "rm -fr repo" &&
+	(
+		cd repo &&
+
+		test_commit reachable &&
+		git repack -Ad &&
+		git branch -M main &&
+
+		git checkout --orphan other &&
+		test_commit cruft &&
+		# incremental repack, leaving existing objects loose (so
+		# they can be "freshened")
+		git repack &&
+
+		tip="$(git rev-parse cruft)" &&
+		path="$objdir/$(test_oid_to_path "$tip")" &&
+		test-tool chmtime --get +1000 "$path" >expect &&
+
+		git checkout main &&
+		git branch -D other &&
+		git tag -d cruft &&
+		git reflog expire --all --expire=all &&
+
+		git repack --cruft -d &&
+
+		mtimes="$(basename $(ls $packdir/pack-*.mtimes))" &&
+		test-tool pack-mtimes "$mtimes" >actual.raw &&
+		grep "$tip" actual.raw | cut -d" " -f2 >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'expiring cruft objects with git gc' '
+	git init repo &&
+	test_when_finished "rm -fr repo" &&
+	(
+		cd repo &&
+
+		test_commit reachable &&
+		git branch -M main &&
+		git checkout --orphan other &&
+		test_commit unreachable &&
+
+		git checkout main &&
+		git branch -D other &&
+		git tag -d unreachable &&
+		# objects are not cruft if they are contained in the reflogs
+		git reflog expire --all --expire=all &&
+
+		git rev-list --objects --all --no-object-names >reachable.raw &&
+		git cat-file --batch-all-objects --batch-check="%(objectname)" >objects &&
+		sort <reachable.raw >reachable &&
+		comm -13 reachable objects >unreachable &&
+
+		# Write a cruft pack containing all unreachable objects.
+		git gc --cruft --prune="01-01-1980" &&
+
+		mtimes=$(ls .git/objects/pack/pack-*.mtimes) &&
+		test_path_is_file $mtimes &&
+
+		# Prune all unreachable objects from the cruft pack.
+		git gc --cruft --prune=now &&
+
+		git cat-file --batch-all-objects --batch-check="%(objectname)" >objects &&
+
+		comm -23 unreachable objects >removed &&
+		test_cmp unreachable removed &&
+		test_path_is_missing $mtimes
+	)
+'
+
+test_expect_success 'cruft packs are not included in geometric repack' '
+	git init repo &&
+	test_when_finished "rm -fr repo" &&
+	(
+		cd repo &&
+
+		test_commit reachable &&
+		git repack -Ad &&
+		git branch -M main &&
+
+		git checkout --orphan other &&
+		test_commit cruft &&
+		git repack -d &&
+
+		git checkout main &&
+		git branch -D other &&
+		git tag -d cruft &&
+		git reflog expire --all --expire=all &&
+
+		git repack --cruft &&
+
+		find $packdir -type f | sort >before &&
+		git repack --geometric=2 -d &&
+		find $packdir -type f | sort >after &&
+
+		test_cmp before after
+	)
+'
+
+test_expect_success 'repack --geometric collects once-cruft objects' '
+	git init repo &&
+	test_when_finished "rm -fr repo" &&
+	(
+		cd repo &&
+
+		test_commit reachable &&
+		git repack -Ad &&
+		git branch -M main &&
+
+		git checkout --orphan other &&
+		git rm -rf . &&
+		test_commit --no-tag cruft &&
+		cruft="$(git rev-parse HEAD)" &&
+
+		git checkout main &&
+		git branch -D other &&
+		git reflog expire --all --expire=all &&
+
+		# Pack the objects created in the previous step into a cruft
+		# pack. Intentionally leave loose copies of those objects
+		# around so we can pick them up in a subsequent --geometric
+		# reapack.
+		git repack --cruft &&
+
+		# Now make those objects reachable, and ensure that they are
+		# packed into the new pack created via a --geometric repack.
+		git update-ref refs/heads/other $cruft &&
+
+		# Without this object, the set of unpacked objects is exactly
+		# the set of objects already in the cruft pack. Tweak that set
+		# to ensure we do not overwrite the cruft pack entirely.
+		test_commit reachable2 &&
+
+		find $packdir -name "pack-*.idx" | sort >before &&
+		git repack --geometric=2 -d &&
+		find $packdir -name "pack-*.idx" | sort >after &&
+
+		{
+			git rev-list --objects --no-object-names $cruft &&
+			git rev-list --objects --no-object-names reachable..reachable2
+		} >want.raw &&
+		sort want.raw >want &&
+
+		pack=$(comm -13 before after) &&
+		git show-index <$pack >objects.raw &&
+
+		cut -d" " -f2 objects.raw | sort >got &&
+
+		test_cmp want got
+	)
+'
+
+test_expect_success 'cruft repack with no reachable objects' '
+	git init repo &&
+	test_when_finished "rm -fr repo" &&
+	(
+		cd repo &&
+
+		test_commit base &&
+		git repack -ad &&
+
+		base="$(git rev-parse base)" &&
+
+		git for-each-ref --format="delete %(refname)" >in &&
+		git update-ref --stdin <in &&
+		git reflog expire --all --expire=all &&
+		rm -fr .git/index &&
+
+		git repack --cruft -d &&
+
+		git cat-file -t $base
+	)
+'
+
+write_blob () {
+	test-tool genrandom "$@" >in &&
+	git hash-object -w -t blob in
+}
+
+find_pack () {
+	for idx in $(ls $packdir/pack-*.idx)
+	do
+		git show-index <$idx >out &&
+		if grep -q "$1" out
+		then
+			echo $idx
+		fi || return 1
+	done
+}
+
+test_expect_success 'cruft repack with --max-pack-size' '
+	git init max-pack-size &&
+	(
+		cd max-pack-size &&
+		test_commit base &&
+
+		# two cruft objects which exceed the maximum pack size
+		foo=$(write_blob foo 1048576) &&
+		bar=$(write_blob bar 1048576) &&
+		test-tool chmtime --get -1000 \
+			"$objdir/$(test_oid_to_path $foo)" >foo.mtime &&
+		test-tool chmtime --get -2000 \
+			"$objdir/$(test_oid_to_path $bar)" >bar.mtime &&
+		git repack --cruft --max-pack-size=1M &&
+		find $packdir -name "*.mtimes" >cruft &&
+		test_line_count = 2 cruft &&
+
+		foo_mtimes="$(basename $(find_pack $foo) .idx).mtimes" &&
+		bar_mtimes="$(basename $(find_pack $bar) .idx).mtimes" &&
+		test-tool pack-mtimes $foo_mtimes >foo.actual &&
+		test-tool pack-mtimes $bar_mtimes >bar.actual &&
+
+		echo "$foo $(cat foo.mtime)" >foo.expect &&
+		echo "$bar $(cat bar.mtime)" >bar.expect &&
+
+		test_cmp foo.expect foo.actual &&
+		test_cmp bar.expect bar.actual &&
+		test "$foo_mtimes" != "$bar_mtimes"
+	)
+'
+
+test_expect_success 'cruft repack with pack.packSizeLimit' '
+	(
+		cd max-pack-size &&
+		# repack everything back together to remove the existing cruft
+		# pack (but to keep its objects)
+		git repack -adk &&
+		git -c pack.packSizeLimit=1M repack --cruft &&
+		# ensure the same post condition is met when --max-pack-size
+		# would otherwise be inferred from the configuration
+		find $packdir -name "*.mtimes" >cruft &&
+		test_line_count = 2 cruft &&
+		for pack in $(cat cruft)
+		do
+			test-tool pack-mtimes "$(basename $pack)" >objects &&
+			test_line_count = 1 objects || return 1
+		done
+	)
+'
+
+test_expect_success 'cruft repack respects repack.cruftWindow' '
+	git init repo &&
+	test_when_finished "rm -fr repo" &&
+	(
+		cd repo &&
+
+		test_commit base &&
+
+		GIT_TRACE2_EVENT=$(pwd)/event.trace \
+		git -c pack.window=1 -c repack.cruftWindow=2 repack \
+		       --cruft --window=3 &&
+
+		grep "pack-objects.*--window=2.*--cruft" event.trace
+	)
+'
+
+test_expect_success 'cruft repack respects --window by default' '
+	git init repo &&
+	test_when_finished "rm -fr repo" &&
+	(
+		cd repo &&
+
+		test_commit base &&
+
+		GIT_TRACE2_EVENT=$(pwd)/event.trace \
+		git -c pack.window=2 repack --cruft --window=3 &&
+
+		grep "pack-objects.*--window=3.*--cruft" event.trace
+	)
+'
+
+test_expect_success 'cruft repack respects --quiet' '
+	git init repo &&
+	test_when_finished "rm -fr repo" &&
+	(
+		cd repo &&
+
+		test_commit base &&
+		GIT_PROGRESS_DELAY=0 git repack --cruft --quiet 2>err &&
+		test_must_be_empty err
+	)
+'
+
+test_expect_success 'cruft --local drops unreachable objects' '
+	git init alternate &&
+	git init repo &&
+	test_when_finished "rm -fr alternate repo" &&
+
+	test_commit -C alternate base &&
+	# Pack all objects in alterate so that the cruft repack in "repo" sees
+	# the object it dropped due to `--local` as packed. Otherwise this
+	# object would not appear packed anywhere (since it is not packed in
+	# alternate and likewise not part of the cruft pack in the other repo
+	# because of `--local`).
+	git -C alternate repack -ad &&
+
+	(
+		cd repo &&
+
+		object="$(git -C ../alternate rev-parse HEAD:base.t)" &&
+		git -C ../alternate cat-file -p $object >contents &&
+
+		# Write some reachable objects and two unreachable ones: one
+		# that the alternate has and another that is unique.
+		test_commit other &&
+		git hash-object -w -t blob contents &&
+		cruft="$(echo cruft | git hash-object -w -t blob --stdin)" &&
+
+		( cd ../alternate/.git/objects && pwd ) \
+		       >.git/objects/info/alternates &&
+
+		test_path_is_file $objdir/$(test_oid_to_path $cruft) &&
+		test_path_is_file $objdir/$(test_oid_to_path $object) &&
+
+		git repack -d --cruft --local &&
+
+		test-tool pack-mtimes "$(basename $(ls $packdir/pack-*.mtimes))" \
+		       >objects &&
+		! grep $object objects &&
+		grep $cruft objects
+	)
+'
+
+test_expect_success 'MIDX bitmaps tolerate reachable cruft objects' '
+	git init repo &&
+	test_when_finished "rm -fr repo" &&
+	(
+		cd repo &&
+
+		test_commit reachable &&
+		test_commit cruft &&
+		unreachable="$(git rev-parse cruft)" &&
+
+		git reset --hard $unreachable^ &&
+		git tag -d cruft &&
+		git reflog expire --all --expire=all &&
+
+		git repack --cruft -d &&
+
+		# resurrect the unreachable object via a new commit. the
+		# new commit will get selected for a bitmap, but be
+		# missing one of its parents from the selected packs.
+		git reset --hard $unreachable &&
+		test_commit resurrect &&
+
+		git repack --write-midx --write-bitmap-index --geometric=2 -d
+	)
+'
+
+test_expect_success 'cruft objects are freshend via loose' '
+	git init repo &&
+	test_when_finished "rm -fr repo" &&
+	(
+		cd repo &&
+
+		echo "cruft" >contents &&
+		blob="$(git hash-object -w -t blob contents)" &&
+		loose="$objdir/$(test_oid_to_path $blob)" &&
+
+		test_commit base &&
+
+		git repack --cruft -d &&
+
+		test_path_is_missing "$loose" &&
+		test-tool pack-mtimes "$(basename "$(ls $packdir/pack-*.mtimes)")" >cruft &&
+		grep "$blob" cruft &&
+
+		# write the same object again
+		git hash-object -w -t blob contents &&
+
+		test_path_is_file "$loose"
+	)
+'
+
+test_expect_success 'gc.recentObjectsHook' '
+	git init repo &&
+	test_when_finished "rm -fr repo" &&
+	(
+		cd repo &&
+
+		# Create a handful of objects.
+		#
+		#   - one reachable commit, "base", designated for the reachable
+		#     pack
+		#   - one unreachable commit, "cruft.discard", which is marked
+		#     for deletion
+		#   - one unreachable commit, "cruft.old", which would be marked
+		#     for deletion, but is rescued as an extra cruft tip
+		#   - one unreachable commit, "cruft.new", which is not marked
+		#     for deletion
+		test_commit base &&
+		git branch -M main &&
+
+		git checkout --orphan discard &&
+		git rm -fr . &&
+		test_commit --no-tag cruft.discard &&
+
+		git checkout --orphan old &&
+		git rm -fr . &&
+		test_commit --no-tag cruft.old &&
+		cruft_old="$(git rev-parse HEAD)" &&
+
+		git checkout --orphan new &&
+		git rm -fr . &&
+		test_commit --no-tag cruft.new &&
+		cruft_new="$(git rev-parse HEAD)" &&
+
+		git checkout main &&
+		git branch -D discard old new &&
+		git reflog expire --all --expire=all &&
+
+		# mark cruft.old with an mtime that is many minutes
+		# older than the expiration period, and mark cruft.new
+		# with an mtime that is in the future (and thus not
+		# eligible for pruning).
+		test-tool chmtime -2000 "$objdir/$(test_oid_to_path $cruft_old)" &&
+		test-tool chmtime +1000 "$objdir/$(test_oid_to_path $cruft_new)" &&
+
+		# Write the list of cruft objects we expect to
+		# accumulate, which is comprised of everything reachable
+		# from cruft.old and cruft.new, but not cruft.discard.
+		git rev-list --objects --no-object-names \
+			$cruft_old $cruft_new >cruft.raw &&
+		sort cruft.raw >cruft.expect &&
+
+		# Write the script to list extra tips, which are limited
+		# to cruft.old, in this case.
+		write_script extra-tips <<-EOF &&
+		echo $cruft_old
+		EOF
+		git config gc.recentObjectsHook ./extra-tips &&
+
+		git repack --cruft --cruft-expiration=now -d &&
+
+		mtimes="$(ls .git/objects/pack/pack-*.mtimes)" &&
+		git show-index <${mtimes%.mtimes}.idx >cruft &&
+		cut -d" " -f2 cruft | sort >cruft.actual &&
+		test_cmp cruft.expect cruft.actual &&
+
+		# Ensure that the "old" objects are removed after
+		# dropping the gc.recentObjectsHook hook.
+		git config --unset gc.recentObjectsHook &&
+		git repack --cruft --cruft-expiration=now -d &&
+
+		mtimes="$(ls .git/objects/pack/pack-*.mtimes)" &&
+		git show-index <${mtimes%.mtimes}.idx >cruft &&
+		cut -d" " -f2 cruft | sort >cruft.actual &&
+
+		git rev-list --objects --no-object-names $cruft_new >cruft.raw &&
+		cp cruft.expect cruft.old &&
+		sort cruft.raw >cruft.expect &&
+		test_cmp cruft.expect cruft.actual &&
+
+		# ensure objects which are no longer in the cruft pack were
+		# removed from the repository
+		for object in $(comm -13 cruft.expect cruft.old)
+		do
+			test_must_fail git cat-file -t $object || return 1
+		done
+	)
+'
+
+test_expect_success 'multi-valued gc.recentObjectsHook' '
+	git init repo &&
+	test_when_finished "rm -fr repo" &&
+	(
+		cd repo &&
+
+		test_commit base &&
+		git branch -M main &&
+
+		git checkout --orphan cruft.a &&
+		git rm -fr . &&
+		test_commit --no-tag cruft.a &&
+		cruft_a="$(git rev-parse HEAD)" &&
+
+		git checkout --orphan cruft.b &&
+		git rm -fr . &&
+		test_commit --no-tag cruft.b &&
+		cruft_b="$(git rev-parse HEAD)" &&
+
+		git checkout main &&
+		git branch -D cruft.a cruft.b &&
+		git reflog expire --all --expire=all &&
+
+		echo "echo $cruft_a" | write_script extra-tips.a &&
+		echo "echo $cruft_b" | write_script extra-tips.b &&
+		echo "false" | write_script extra-tips.c &&
+
+		git rev-list --objects --no-object-names $cruft_a $cruft_b \
+			>cruft.raw &&
+		sort cruft.raw >cruft.expect &&
+
+		# ensure that each extra cruft tip is saved by its
+		# respective hook
+		git config --add gc.recentObjectsHook ./extra-tips.a &&
+		git config --add gc.recentObjectsHook ./extra-tips.b &&
+		git repack --cruft --cruft-expiration=now -d &&
+
+		mtimes="$(ls .git/objects/pack/pack-*.mtimes)" &&
+		git show-index <${mtimes%.mtimes}.idx >cruft &&
+		cut -d" " -f2 cruft | sort >cruft.actual &&
+		test_cmp cruft.expect cruft.actual &&
+
+		# ensure that a dirty exit halts cruft pack generation
+		git config --add gc.recentObjectsHook ./extra-tips.c &&
+		test_must_fail git repack --cruft --cruft-expiration=now -d 2>err &&
+		grep "unable to enumerate additional recent objects" err &&
+
+		# and that the existing cruft pack is left alone
+		test_path_is_file "$mtimes"
+	)
+'
+
+test_expect_success 'additional cruft blobs via gc.recentObjectsHook' '
+	git init repo &&
+	test_when_finished "rm -fr repo" &&
+	(
+		cd repo &&
+
+		test_commit base &&
+
+		blob=$(echo "unreachable" | git hash-object -w --stdin) &&
+
+		# mark the unreachable blob we wrote above as having
+		# aged out of the retention period
+		test-tool chmtime -2000 "$objdir/$(test_oid_to_path $blob)" &&
+
+		# Write the script to list extra tips, which is just the
+		# extra blob as above.
+		write_script extra-tips <<-EOF &&
+		echo $blob
+		EOF
+		git config gc.recentObjectsHook ./extra-tips &&
+
+		git repack --cruft --cruft-expiration=now -d &&
+
+		mtimes="$(ls .git/objects/pack/pack-*.mtimes)" &&
+		git show-index <${mtimes%.mtimes}.idx >cruft &&
+		cut -d" " -f2 cruft >actual &&
+		echo $blob >expect &&
+		test_cmp expect actual
+	)
+'
+
+test_done
diff --git a/t/t5330-no-lazy-fetch-with-commit-graph.sh b/t/t5330-no-lazy-fetch-with-commit-graph.sh
new file mode 100755
index 0000000..5eb28f0
--- /dev/null
+++ b/t/t5330-no-lazy-fetch-with-commit-graph.sh
@@ -0,0 +1,48 @@
+#!/bin/sh
+
+test_description='test for no lazy fetch with the commit-graph'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+test_expect_success 'setup: prepare a repository with a commit' '
+	git init with-commit &&
+	test_commit -C with-commit the-commit &&
+	oid=$(git -C with-commit rev-parse HEAD)
+'
+
+test_expect_success 'setup: prepare a repository with commit-graph contains the commit' '
+	git init with-commit-graph &&
+	echo "$(pwd)/with-commit/.git/objects" \
+		>with-commit-graph/.git/objects/info/alternates &&
+	# create a ref that points to the commit in alternates
+	git -C with-commit-graph update-ref refs/ref_to_the_commit "$oid" &&
+	# prepare some other objects to commit-graph
+	test_commit -C with-commit-graph something &&
+	git -c gc.writeCommitGraph=true -C with-commit-graph gc &&
+	test_path_is_file with-commit-graph/.git/objects/info/commit-graph
+'
+
+test_expect_success 'setup: change the alternates to what without the commit' '
+	git init --bare without-commit &&
+	git -C with-commit-graph cat-file -e $oid &&
+	echo "$(pwd)/without-commit/objects" \
+		>with-commit-graph/.git/objects/info/alternates &&
+	test_must_fail git -C with-commit-graph cat-file -e $oid
+'
+
+test_expect_success 'fetch any commit from promisor with the usage of the commit graph' '
+	# setup promisor and prepare any commit to fetch
+	git -C with-commit-graph remote add origin "$(pwd)/with-commit" &&
+	git -C with-commit-graph config remote.origin.promisor true &&
+	git -C with-commit-graph config remote.origin.partialclonefilter blob:none &&
+	test_commit -C with-commit any-commit &&
+	anycommit=$(git -C with-commit rev-parse HEAD) &&
+	GIT_TRACE="$(pwd)/trace.txt" \
+		git -C with-commit-graph fetch origin $anycommit 2>err &&
+	! grep "fatal: promisor-remote: unable to fork off fetch subprocess" err &&
+	grep "git fetch origin" trace.txt >actual &&
+	test_line_count = 1 actual
+'
+
+test_done
diff --git a/t/t5331-pack-objects-stdin.sh b/t/t5331-pack-objects-stdin.sh
new file mode 100755
index 0000000..2dcf1ee
--- /dev/null
+++ b/t/t5331-pack-objects-stdin.sh
@@ -0,0 +1,240 @@
+#!/bin/sh
+
+test_description='pack-objects --stdin'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+packed_objects () {
+	git show-index <"$1" >tmp-object-list &&
+	cut -d' ' -f2 tmp-object-list | sort &&
+	rm tmp-object-list
+ }
+
+test_expect_success 'setup for --stdin-packs tests' '
+	git init stdin-packs &&
+	(
+		cd stdin-packs &&
+
+		test_commit A &&
+		test_commit B &&
+		test_commit C &&
+
+		for id in A B C
+		do
+			git pack-objects .git/objects/pack/pack-$id \
+				--incremental --revs <<-EOF || exit 1
+			refs/tags/$id
+			EOF
+		done &&
+
+		ls -la .git/objects/pack
+	)
+'
+
+test_expect_success '--stdin-packs with excluded packs' '
+	(
+		cd stdin-packs &&
+
+		PACK_A="$(basename .git/objects/pack/pack-A-*.pack)" &&
+		PACK_B="$(basename .git/objects/pack/pack-B-*.pack)" &&
+		PACK_C="$(basename .git/objects/pack/pack-C-*.pack)" &&
+
+		git pack-objects test --stdin-packs <<-EOF &&
+		$PACK_A
+		^$PACK_B
+		$PACK_C
+		EOF
+
+		(
+			git show-index <$(ls .git/objects/pack/pack-A-*.idx) &&
+			git show-index <$(ls .git/objects/pack/pack-C-*.idx)
+		) >expect.raw &&
+		git show-index <$(ls test-*.idx) >actual.raw &&
+
+		cut -d" " -f2 <expect.raw | sort >expect &&
+		cut -d" " -f2 <actual.raw | sort >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success '--stdin-packs is incompatible with --filter' '
+	(
+		cd stdin-packs &&
+		test_must_fail git pack-objects --stdin-packs --stdout \
+			--filter=blob:none </dev/null 2>err &&
+		test_grep "cannot use --filter with --stdin-packs" err
+	)
+'
+
+test_expect_success '--stdin-packs is incompatible with --revs' '
+	(
+		cd stdin-packs &&
+		test_must_fail git pack-objects --stdin-packs --revs out \
+			</dev/null 2>err &&
+		test_grep "cannot use internal rev list with --stdin-packs" err
+	)
+'
+
+test_expect_success '--stdin-packs with loose objects' '
+	(
+		cd stdin-packs &&
+
+		PACK_A="$(basename .git/objects/pack/pack-A-*.pack)" &&
+		PACK_B="$(basename .git/objects/pack/pack-B-*.pack)" &&
+		PACK_C="$(basename .git/objects/pack/pack-C-*.pack)" &&
+
+		test_commit D && # loose
+
+		git pack-objects test2 --stdin-packs --unpacked <<-EOF &&
+		$PACK_A
+		^$PACK_B
+		$PACK_C
+		EOF
+
+		(
+			git show-index <$(ls .git/objects/pack/pack-A-*.idx) &&
+			git show-index <$(ls .git/objects/pack/pack-C-*.idx) &&
+			git rev-list --objects --no-object-names \
+				refs/tags/C..refs/tags/D
+
+		) >expect.raw &&
+		ls -la . &&
+		git show-index <$(ls test2-*.idx) >actual.raw &&
+
+		cut -d" " -f2 <expect.raw | sort >expect &&
+		cut -d" " -f2 <actual.raw | sort >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success '--stdin-packs with broken links' '
+	(
+		cd stdin-packs &&
+
+		# make an unreachable object with a bogus parent
+		git cat-file -p HEAD >commit &&
+		sed "s/$(git rev-parse HEAD^)/$(test_oid zero)/" <commit |
+		git hash-object -w -t commit --stdin >in &&
+
+		git pack-objects .git/objects/pack/pack-D <in &&
+
+		PACK_A="$(basename .git/objects/pack/pack-A-*.pack)" &&
+		PACK_B="$(basename .git/objects/pack/pack-B-*.pack)" &&
+		PACK_C="$(basename .git/objects/pack/pack-C-*.pack)" &&
+		PACK_D="$(basename .git/objects/pack/pack-D-*.pack)" &&
+
+		git pack-objects test3 --stdin-packs --unpacked <<-EOF &&
+		$PACK_A
+		^$PACK_B
+		$PACK_C
+		$PACK_D
+		EOF
+
+		(
+			git show-index <$(ls .git/objects/pack/pack-A-*.idx) &&
+			git show-index <$(ls .git/objects/pack/pack-C-*.idx) &&
+			git show-index <$(ls .git/objects/pack/pack-D-*.idx) &&
+			git rev-list --objects --no-object-names \
+				refs/tags/C..refs/tags/D
+		) >expect.raw &&
+		git show-index <$(ls test3-*.idx) >actual.raw &&
+
+		cut -d" " -f2 <expect.raw | sort >expect &&
+		cut -d" " -f2 <actual.raw | sort >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'pack-objects --stdin with duplicate packfile' '
+	test_when_finished "rm -fr repo" &&
+
+	git init repo &&
+	(
+		cd repo &&
+		test_commit "commit" &&
+		git repack -ad &&
+
+		{
+			basename .git/objects/pack/pack-*.pack &&
+			basename .git/objects/pack/pack-*.pack
+		} >packfiles &&
+
+		git pack-objects --stdin-packs generated-pack <packfiles &&
+		packed_objects .git/objects/pack/pack-*.idx >expect &&
+		packed_objects generated-pack-*.idx >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'pack-objects --stdin with same packfile excluded and included' '
+	test_when_finished "rm -fr repo" &&
+
+	git init repo &&
+	(
+		cd repo &&
+		test_commit "commit" &&
+		git repack -ad &&
+
+		{
+			basename .git/objects/pack/pack-*.pack &&
+			printf "^%s\n" "$(basename .git/objects/pack/pack-*.pack)"
+		} >packfiles &&
+
+		git pack-objects --stdin-packs generated-pack <packfiles &&
+		packed_objects generated-pack-*.idx >packed-objects &&
+		test_must_be_empty packed-objects
+	)
+'
+
+test_expect_success 'pack-objects --stdin with packfiles from alternate object database' '
+	test_when_finished "rm -fr shared member" &&
+
+	# Set up a shared repository with a single packfile.
+	git init shared &&
+	test_commit -C shared "shared-objects" &&
+	git -C shared repack -ad &&
+	basename shared/.git/objects/pack/pack-*.pack >packfile &&
+
+	# Set up a repository that is connected to the shared repository. This
+	# repository has no objects on its own, but we still expect to be able
+	# to pack objects from its alternate.
+	git clone --shared shared member &&
+	git -C member pack-objects --stdin-packs generated-pack <packfile &&
+	test_cmp shared/.git/objects/pack/pack-*.pack member/generated-pack-*.pack
+'
+
+test_expect_success 'pack-objects --stdin with packfiles from main and alternate object database' '
+	test_when_finished "rm -fr shared member" &&
+
+	# Set up a shared repository with a single packfile.
+	git init shared &&
+	test_commit -C shared "shared-commit" &&
+	git -C shared repack -ad &&
+
+	# Set up a repository that is connected to the shared repository. This
+	# repository has a second packfile so that we can verify that it is
+	# possible to write packs that include packfiles from different object
+	# databases.
+	git clone --shared shared member &&
+	test_commit -C member "local-commit" &&
+	git -C member repack -dl &&
+
+	{
+		basename shared/.git/objects/pack/pack-*.pack &&
+		basename member/.git/objects/pack/pack-*.pack
+	} >packfiles &&
+
+	{
+		packed_objects shared/.git/objects/pack/pack-*.idx &&
+		packed_objects member/.git/objects/pack/pack-*.idx
+	} | sort >expected-objects &&
+
+	git -C member pack-objects --stdin-packs generated-pack <packfiles &&
+	packed_objects member/generated-pack-*.idx >actual-objects &&
+	test_cmp expected-objects actual-objects
+'
+
+test_done
diff --git a/t/t5332-multi-pack-reuse.sh b/t/t5332-multi-pack-reuse.sh
new file mode 100755
index 0000000..3c20738
--- /dev/null
+++ b/t/t5332-multi-pack-reuse.sh
@@ -0,0 +1,207 @@
+#!/bin/sh
+
+test_description='pack-objects multi-pack reuse'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-bitmap.sh
+
+objdir=.git/objects
+packdir=$objdir/pack
+
+test_pack_reused () {
+	test_trace2_data pack-objects pack-reused "$1"
+}
+
+test_packs_reused () {
+	test_trace2_data pack-objects packs-reused "$1"
+}
+
+
+# pack_position <object> </path/to/pack.idx
+pack_position () {
+	git show-index >objects &&
+	grep "$1" objects | cut -d" " -f1
+}
+
+# test_pack_objects_reused_all <pack-reused> <packs-reused>
+test_pack_objects_reused_all () {
+	: >trace2.txt &&
+	GIT_TRACE2_EVENT="$PWD/trace2.txt" \
+		git pack-objects --stdout --revs --all --delta-base-offset \
+		>/dev/null &&
+
+	test_pack_reused "$1" <trace2.txt &&
+	test_packs_reused "$2" <trace2.txt
+}
+
+# test_pack_objects_reused <pack-reused> <packs-reused>
+test_pack_objects_reused () {
+	: >trace2.txt &&
+	GIT_TRACE2_EVENT="$PWD/trace2.txt" \
+		git pack-objects --stdout --revs >/dev/null &&
+
+	test_pack_reused "$1" <trace2.txt &&
+	test_packs_reused "$2" <trace2.txt
+}
+
+test_expect_success 'preferred pack is reused for single-pack reuse' '
+	test_config pack.allowPackReuse single &&
+
+	for i in A B
+	do
+		test_commit "$i" &&
+		git repack -d || return 1
+	done &&
+
+	git multi-pack-index write --bitmap &&
+
+	test_pack_objects_reused_all 3 1
+'
+
+test_expect_success 'multi-pack reuse is disabled by default' '
+	test_pack_objects_reused_all 3 1
+'
+
+test_expect_success 'feature.experimental implies multi-pack reuse' '
+	test_config feature.experimental true &&
+
+	test_pack_objects_reused_all 6 2
+'
+
+test_expect_success 'multi-pack reuse can be disabled with feature.experimental' '
+	test_config feature.experimental true &&
+	test_config pack.allowPackReuse single &&
+
+	test_pack_objects_reused_all 3 1
+'
+
+test_expect_success 'enable multi-pack reuse' '
+	git config pack.allowPackReuse multi
+'
+
+test_expect_success 'reuse all objects from subset of bitmapped packs' '
+	test_commit C &&
+	git repack -d &&
+
+	git multi-pack-index write --bitmap &&
+
+	cat >in <<-EOF &&
+	$(git rev-parse C)
+	^$(git rev-parse A)
+	EOF
+
+	test_pack_objects_reused 6 2 <in
+'
+
+test_expect_success 'reuse all objects from all packs' '
+	test_pack_objects_reused_all 9 3
+'
+
+test_expect_success 'reuse objects from first pack with middle gap' '
+	for i in D E F
+	do
+		test_commit "$i" || return 1
+	done &&
+
+	# Set "pack.window" to zero to ensure that we do not create any
+	# deltas, which could alter the amount of pack reuse we perform
+	# (if, for e.g., we are not sending one or more bases).
+	D="$(git -c pack.window=0 pack-objects --all --unpacked $packdir/pack)" &&
+
+	d_pos="$(pack_position $(git rev-parse D) <$packdir/pack-$D.idx)" &&
+	e_pos="$(pack_position $(git rev-parse E) <$packdir/pack-$D.idx)" &&
+	f_pos="$(pack_position $(git rev-parse F) <$packdir/pack-$D.idx)" &&
+
+	# commits F, E, and D, should appear in that order at the
+	# beginning of the pack
+	test $f_pos -lt $e_pos &&
+	test $e_pos -lt $d_pos &&
+
+	# Ensure that the pack we are constructing sorts ahead of any
+	# other packs in lexical/bitmap order by choosing it as the
+	# preferred pack.
+	git multi-pack-index write --bitmap --preferred-pack="pack-$D.idx" &&
+
+	cat >in <<-EOF &&
+	$(git rev-parse E)
+	^$(git rev-parse D)
+	EOF
+
+	test_pack_objects_reused 3 1 <in
+'
+
+test_expect_success 'reuse objects from middle pack with middle gap' '
+	rm -fr $packdir/multi-pack-index* &&
+
+	# Ensure that the pack we are constructing sort into any
+	# position *but* the first one, by choosing a different pack as
+	# the preferred one.
+	git multi-pack-index write --bitmap --preferred-pack="pack-$A.idx" &&
+
+	cat >in <<-EOF &&
+	$(git rev-parse E)
+	^$(git rev-parse D)
+	EOF
+
+	test_pack_objects_reused 3 1 <in
+'
+
+test_expect_success 'omit delta with uninteresting base (same pack)' '
+	git repack -adk &&
+
+	test_seq 32 >f &&
+	git add f &&
+	test_tick &&
+	git commit -m "delta" &&
+	delta="$(git rev-parse HEAD)" &&
+
+	test_seq 64 >f &&
+	test_tick &&
+	git commit -a -m "base" &&
+	base="$(git rev-parse HEAD)" &&
+
+	test_commit other &&
+
+	git repack -d &&
+
+	have_delta "$(git rev-parse $delta:f)" "$(git rev-parse $base:f)" &&
+
+	git multi-pack-index write --bitmap &&
+
+	cat >in <<-EOF &&
+	$(git rev-parse other)
+	^$base
+	EOF
+
+	# We can only reuse the 3 objects corresponding to "other" from
+	# the latest pack.
+	#
+	# This is because even though we want "delta", we do not want
+	# "base", meaning that we have to inflate the delta/base-pair
+	# corresponding to the blob in commit "delta", which bypasses
+	# the pack-reuse mechanism.
+	#
+	# The remaining objects from the other pack are similarly not
+	# reused because their objects are on the uninteresting side of
+	# the query.
+	test_pack_objects_reused 3 1 <in
+'
+
+test_expect_success 'omit delta from uninteresting base (cross pack)' '
+	cat >in <<-EOF &&
+	$(git rev-parse $base)
+	^$(git rev-parse $delta)
+	EOF
+
+	P="$(git pack-objects --revs $packdir/pack <in)" &&
+
+	git multi-pack-index write --bitmap --preferred-pack="pack-$P.idx" &&
+
+	packs_nr="$(find $packdir -type f -name "pack-*.pack" | wc -l)" &&
+	objects_nr="$(git rev-list --count --all --objects)" &&
+
+	test_pack_objects_reused_all $(($objects_nr - 1)) $packs_nr
+'
+
+test_done
diff --git a/t/t5351-unpack-large-objects.sh b/t/t5351-unpack-large-objects.sh
new file mode 100755
index 0000000..43cbcd5
--- /dev/null
+++ b/t/t5351-unpack-large-objects.sh
@@ -0,0 +1,103 @@
+#!/bin/sh
+#
+# Copyright (c) 2022 Han Xin
+#
+
+test_description='git unpack-objects with large objects'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+prepare_dest () {
+	test_when_finished "rm -rf dest.git" &&
+	git init --bare dest.git &&
+	git -C dest.git config core.bigFileThreshold "$1"
+}
+
+test_expect_success "create large objects (1.5 MB) and PACK" '
+	test-tool genrandom foo 1500000 >big-blob &&
+	test_commit --append foo big-blob &&
+	test-tool genrandom bar 1500000 >big-blob &&
+	test_commit --append bar big-blob &&
+	PACK=$(echo HEAD | git pack-objects --revs pack) &&
+	git verify-pack -v pack-$PACK.pack >out &&
+	sed -n -e "s/^\([0-9a-f][0-9a-f]*\).*\(commit\|tree\|blob\).*/\1/p" \
+		<out >obj-list
+'
+
+test_expect_success 'set memory limitation to 1MB' '
+	GIT_ALLOC_LIMIT=1m &&
+	export GIT_ALLOC_LIMIT
+'
+
+test_expect_success 'unpack-objects failed under memory limitation' '
+	prepare_dest 2m &&
+	test_must_fail git -C dest.git unpack-objects <pack-$PACK.pack 2>err &&
+	grep "fatal: attempting to allocate" err
+'
+
+test_expect_success 'unpack-objects works with memory limitation in dry-run mode' '
+	prepare_dest 2m &&
+	git -C dest.git unpack-objects -n <pack-$PACK.pack &&
+	test_stdout_line_count = 0 find dest.git/objects -type f &&
+	test_dir_is_empty dest.git/objects/pack
+'
+
+test_expect_success 'unpack big object in stream' '
+	prepare_dest 1m &&
+	git -C dest.git unpack-objects <pack-$PACK.pack &&
+	test_dir_is_empty dest.git/objects/pack
+'
+
+check_fsync_events () {
+	local trace="$1" &&
+	shift &&
+
+	cat >expect &&
+	sed -n \
+		-e '/^{"event":"counter",.*"category":"fsync",/ {
+			s/.*"category":"fsync",//;
+			s/}$//;
+			p;
+		}' \
+		<"$trace" >actual &&
+	test_cmp expect actual
+}
+
+BATCH_CONFIGURATION='-c core.fsync=loose-object -c core.fsyncmethod=batch'
+
+test_expect_success 'unpack big object in stream (core.fsyncmethod=batch)' '
+	prepare_dest 1m &&
+	GIT_TRACE2_EVENT="$(pwd)/trace2.txt" \
+	GIT_TEST_FSYNC=true \
+		git -C dest.git $BATCH_CONFIGURATION unpack-objects <pack-$PACK.pack &&
+	if grep "core.fsyncMethod = batch is unsupported" trace2.txt
+	then
+		flush_count=7
+	else
+		flush_count=1
+	fi &&
+	check_fsync_events trace2.txt <<-EOF &&
+	"name":"writeout-only","count":6
+	"name":"hardware-flush","count":$flush_count
+	EOF
+
+	test_dir_is_empty dest.git/objects/pack &&
+	git -C dest.git cat-file --batch-check="%(objectname)" <obj-list >current &&
+	cmp obj-list current
+'
+
+test_expect_success 'do not unpack existing large objects' '
+	prepare_dest 1m &&
+	git -C dest.git index-pack --stdin <pack-$PACK.pack &&
+	git -C dest.git unpack-objects <pack-$PACK.pack &&
+
+	# The destination came up with the exact same pack...
+	DEST_PACK=$(echo dest.git/objects/pack/pack-*.pack) &&
+	cmp pack-$PACK.pack $DEST_PACK &&
+
+	# ...and wrote no loose objects
+	test_stdout_line_count = 0 find dest.git/objects -type f ! -name "pack-*"
+'
+
+test_done
diff --git a/t/t5400-send-pack.sh b/t/t5400-send-pack.sh
index b84618c..3f81f16 100755
--- a/t/t5400-send-pack.sh
+++ b/t/t5400-send-pack.sh
@@ -6,6 +6,9 @@
 test_description='See why rewinding head breaks send-pack
 
 '
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 cnt=64
@@ -21,14 +24,15 @@ test_expect_success setup '
 	i=0 &&
 	while test $i -le $cnt
 	do
-	    i=$(($i+1)) &&
-	    test_tick &&
-	    echo "Commit #$i" >mozart/is/pink &&
-	    git update-index --add mozart/is/pink &&
-	    tree=$(git write-tree) &&
-	    commit=$(echo "Commit #$i" | git commit-tree $tree -p $parent) &&
-	    git update-ref refs/tags/commit$i $commit &&
-	    parent=$commit || return 1
+		i=$(($i+1)) &&
+		test_tick &&
+		echo "Commit #$i" >mozart/is/pink &&
+		git update-index --add mozart/is/pink &&
+		tree=$(git write-tree) &&
+		commit=$(echo "Commit #$i" |
+			 git commit-tree $tree -p $parent) &&
+		git update-ref refs/tags/commit$i $commit &&
+		parent=$commit || return 1
 	done &&
 	git update-ref HEAD "$commit" &&
 	git clone ./. victim &&
@@ -38,14 +42,14 @@ test_expect_success setup '
 	i=0 &&
 	while test $i -le $cnt
 	do
-	    i=$(($i+1)) &&
-	    test_tick &&
-	    echo "Rebase #$i" >mozart/is/pink &&
-	    git update-index --add mozart/is/pink &&
-	    tree=$(git write-tree) &&
-	    commit=$(echo "Rebase #$i" | git commit-tree $tree -p $parent) &&
-	    git update-ref refs/tags/rebase$i $commit &&
-	    parent=$commit || return 1
+		i=$(($i+1)) &&
+		test_tick &&
+		echo "Rebase #$i" >mozart/is/pink &&
+		git update-index --add mozart/is/pink &&
+		tree=$(git write-tree) &&
+		commit=$(echo "Rebase #$i" | git commit-tree $tree -p $parent) &&
+		git update-ref refs/tags/rebase$i $commit &&
+		parent=$commit || return 1
 	done &&
 	git update-ref HEAD "$commit" &&
 	echo Rebase &&
@@ -57,40 +61,40 @@ test_expect_success 'pack the source repository' '
 '
 
 test_expect_success 'pack the destination repository' '
-    (
-	cd victim &&
-	git repack -a -d &&
-	git prune
-    )
+	(
+		cd victim &&
+		git repack -a -d &&
+		git prune
+	)
 '
 
 test_expect_success 'refuse pushing rewound head without --force' '
-	pushed_head=$(git rev-parse --verify master) &&
-	victim_orig=$(cd victim && git rev-parse --verify master) &&
-	test_must_fail git send-pack ./victim master &&
-	victim_head=$(cd victim && git rev-parse --verify master) &&
+	pushed_head=$(git rev-parse --verify main) &&
+	victim_orig=$(cd victim && git rev-parse --verify main) &&
+	test_must_fail git send-pack ./victim main &&
+	victim_head=$(cd victim && git rev-parse --verify main) &&
 	test "$victim_head" = "$victim_orig" &&
 	# this should update
-	git send-pack --force ./victim master &&
-	victim_head=$(cd victim && git rev-parse --verify master) &&
+	git send-pack --force ./victim main &&
+	victim_head=$(cd victim && git rev-parse --verify main) &&
 	test "$victim_head" = "$pushed_head"
 '
 
 test_expect_success 'push can be used to delete a ref' '
-	( cd victim && git branch extra master ) &&
-	git send-pack ./victim :extra master &&
+	( cd victim && git branch extra main ) &&
+	git send-pack ./victim :extra main &&
 	( cd victim &&
 	  test_must_fail git rev-parse --verify extra )
 '
 
 test_expect_success 'refuse deleting push with denyDeletes' '
 	(
-	    cd victim &&
-	    test_might_fail git branch -D extra &&
-	    git config receive.denyDeletes true &&
-	    git branch extra master
+		cd victim &&
+		test_might_fail git branch -D extra &&
+		git config receive.denyDeletes true &&
+		git branch extra main
 	) &&
-	test_must_fail git send-pack ./victim :extra master
+	test_must_fail git send-pack ./victim :extra main
 '
 
 test_expect_success 'cannot override denyDeletes with git -c send-pack' '
@@ -98,10 +102,10 @@ test_expect_success 'cannot override denyDeletes with git -c send-pack' '
 		cd victim &&
 		test_might_fail git branch -D extra &&
 		git config receive.denyDeletes true &&
-		git branch extra master
+		git branch extra main
 	) &&
 	test_must_fail git -c receive.denyDeletes=false \
-					send-pack ./victim :extra master
+					send-pack ./victim :extra main
 '
 
 test_expect_success 'override denyDeletes with git -c receive-pack' '
@@ -109,22 +113,22 @@ test_expect_success 'override denyDeletes with git -c receive-pack' '
 		cd victim &&
 		test_might_fail git branch -D extra &&
 		git config receive.denyDeletes true &&
-		git branch extra master
+		git branch extra main
 	) &&
 	git send-pack \
 		--receive-pack="git -c receive.denyDeletes=false receive-pack" \
-		./victim :extra master
+		./victim :extra main
 '
 
 test_expect_success 'denyNonFastforwards trumps --force' '
 	(
-	    cd victim &&
-	    test_might_fail git branch -D extra &&
-	    git config receive.denyNonFastforwards true
+		cd victim &&
+		test_might_fail git branch -D extra &&
+		git config receive.denyNonFastforwards true
 	) &&
-	victim_orig=$(cd victim && git rev-parse --verify master) &&
-	test_must_fail git send-pack --force ./victim master^:master &&
-	victim_head=$(cd victim && git rev-parse --verify master) &&
+	victim_orig=$(cd victim && git rev-parse --verify main) &&
+	test_must_fail git send-pack --force ./victim main^:main &&
+	victim_head=$(cd victim && git rev-parse --verify main) &&
 	test "$victim_orig" = "$victim_head"
 '
 
@@ -143,16 +147,16 @@ test_expect_success 'send-pack --all sends all branches' '
 test_expect_success 'push --all excludes remote-tracking hierarchy' '
 	mkdir parent &&
 	(
-	    cd parent &&
-	    git init && : >file && git add file && git commit -m add
+		cd parent &&
+		git init && : >file && git add file && git commit -m add
 	) &&
 	git clone parent child &&
 	(
-	    cd child && git push --all
+		cd child && git push --all
 	) &&
 	(
-	    cd parent &&
-	    test -z "$(git for-each-ref refs/remotes/origin)"
+		cd parent &&
+		test -z "$(git for-each-ref refs/remotes/origin)"
 	)
 '
 
@@ -160,33 +164,33 @@ test_expect_success 'receive-pack runs auto-gc in remote repo' '
 	rm -rf parent child &&
 	git init parent &&
 	(
-	    # Setup a repo with 2 packs
-	    cd parent &&
-	    echo "Some text" >file.txt &&
-	    git add . &&
-	    git commit -m "Initial commit" &&
-	    git repack -adl &&
-	    echo "Some more text" >>file.txt &&
-	    git commit -a -m "Second commit" &&
-	    git repack
+		# Setup a repo with 2 packs
+		cd parent &&
+		echo "Some text" >file.txt &&
+		git add . &&
+		git commit -m "Initial commit" &&
+		git repack -adl &&
+		echo "Some more text" >>file.txt &&
+		git commit -a -m "Second commit" &&
+		git repack
 	) &&
 	cp -R parent child &&
 	(
-	    # Set the child to auto-pack if more than one pack exists
-	    cd child &&
-	    git config gc.autopacklimit 1 &&
-	    git config gc.autodetach false &&
-	    git branch test_auto_gc &&
-	    # And create a file that follows the temporary object naming
-	    # convention for the auto-gc to remove
-	    : >.git/objects/tmp_test_object &&
-	    test-tool chmtime =-1209601 .git/objects/tmp_test_object
+		# Set the child to auto-pack if more than one pack exists
+		cd child &&
+		git config gc.autopacklimit 1 &&
+		git config gc.autodetach false &&
+		git branch test_auto_gc &&
+		# And create a file that follows the temporary object naming
+		# convention for the auto-gc to remove
+		: >.git/objects/tmp_test_object &&
+		test-tool chmtime =-1209601 .git/objects/tmp_test_object
 	) &&
 	(
-	    cd parent &&
-	    echo "Even more text" >>file.txt &&
-	    git commit -a -m "Third commit" &&
-	    git send-pack ../child HEAD:refs/heads/test_auto_gc
+		cd parent &&
+		echo "Even more text" >>file.txt &&
+		git commit -a -m "Third commit" &&
+		git send-pack ../child HEAD:refs/heads/test_auto_gc
 	) &&
 	test ! -e child/.git/objects/tmp_test_object
 '
@@ -195,63 +199,63 @@ rewound_push_setup() {
 	rm -rf parent child &&
 	mkdir parent &&
 	(
-	    cd parent &&
-	    git init &&
-	    echo one >file && git add file && git commit -m one &&
-	    git config receive.denyCurrentBranch warn &&
-	    echo two >file && git commit -a -m two
+		cd parent &&
+		git init &&
+		echo one >file && git add file && git commit -m one &&
+		git config receive.denyCurrentBranch warn &&
+		echo two >file && git commit -a -m two
 	) &&
 	git clone parent child &&
 	(
-	    cd child && git reset --hard HEAD^
+		cd child && git reset --hard HEAD^
 	)
 }
 
 test_expect_success 'pushing explicit refspecs respects forcing' '
 	rewound_push_setup &&
-	parent_orig=$(cd parent && git rev-parse --verify master) &&
+	parent_orig=$(cd parent && git rev-parse --verify main) &&
 	(
-	    cd child &&
-	    test_must_fail git send-pack ../parent \
-		refs/heads/master:refs/heads/master
+		cd child &&
+		test_must_fail git send-pack ../parent \
+			refs/heads/main:refs/heads/main
 	) &&
-	parent_head=$(cd parent && git rev-parse --verify master) &&
+	parent_head=$(cd parent && git rev-parse --verify main) &&
 	test "$parent_orig" = "$parent_head" &&
 	(
-	    cd child &&
-	    git send-pack ../parent \
-	        +refs/heads/master:refs/heads/master
+		cd child &&
+		git send-pack ../parent \
+			+refs/heads/main:refs/heads/main
 	) &&
-	parent_head=$(cd parent && git rev-parse --verify master) &&
-	child_head=$(cd child && git rev-parse --verify master) &&
+	parent_head=$(cd parent && git rev-parse --verify main) &&
+	child_head=$(cd child && git rev-parse --verify main) &&
 	test "$parent_head" = "$child_head"
 '
 
 test_expect_success 'pushing wildcard refspecs respects forcing' '
 	rewound_push_setup &&
-	parent_orig=$(cd parent && git rev-parse --verify master) &&
+	parent_orig=$(cd parent && git rev-parse --verify main) &&
 	(
-	    cd child &&
-	    test_must_fail git send-pack ../parent \
-	        "refs/heads/*:refs/heads/*"
+		cd child &&
+		test_must_fail git send-pack ../parent \
+			"refs/heads/*:refs/heads/*"
 	) &&
-	parent_head=$(cd parent && git rev-parse --verify master) &&
+	parent_head=$(cd parent && git rev-parse --verify main) &&
 	test "$parent_orig" = "$parent_head" &&
 	(
-	    cd child &&
-	    git send-pack ../parent \
-	        "+refs/heads/*:refs/heads/*"
+		cd child &&
+		git send-pack ../parent \
+			"+refs/heads/*:refs/heads/*"
 	) &&
-	parent_head=$(cd parent && git rev-parse --verify master) &&
-	child_head=$(cd child && git rev-parse --verify master) &&
+	parent_head=$(cd parent && git rev-parse --verify main) &&
+	child_head=$(cd child && git rev-parse --verify main) &&
 	test "$parent_head" = "$child_head"
 '
 
 test_expect_success 'deny pushing to delete current branch' '
 	rewound_push_setup &&
 	(
-	    cd child &&
-	    test_must_fail git send-pack ../parent :refs/heads/master 2>errs
+		cd child &&
+		test_must_fail git send-pack ../parent :refs/heads/main 2>errs
 	)
 '
 
@@ -282,14 +286,14 @@ test_expect_success 'receive-pack de-dupes .have lines' '
 	local=$(git -C fork rev-parse HEAD) &&
 	shared=$(git -C shared rev-parse only-shared) &&
 	cat >expect <<-EOF &&
-	$local refs/heads/master
+	$local refs/heads/main
 	$local refs/remotes/origin/HEAD
-	$local refs/remotes/origin/master
+	$local refs/remotes/origin/main
 	$shared .have
 	EOF
 
 	GIT_TRACE_PACKET=$(pwd)/trace GIT_TEST_PROTOCOL_VERSION=0 \
-	    git push \
+	git push \
 		--receive-pack="unset GIT_TRACE_PACKET; git-receive-pack" \
 		fork HEAD:foo &&
 	extract_ref_advertisement <trace >refs &&
diff --git a/t/t5401-update-hooks.sh b/t/t5401-update-hooks.sh
index 956d69f..d8cadee 100755
--- a/t/t5401-update-hooks.sh
+++ b/t/t5401-update-hooks.sh
@@ -15,58 +15,50 @@ test_expect_success setup '
 	git update-index a &&
 	tree1=$(git write-tree) &&
 	commit1=$(echo modify | git commit-tree $tree1 -p $commit0) &&
-	git update-ref refs/heads/master $commit0 &&
+	git update-ref refs/heads/main $commit0 &&
 	git update-ref refs/heads/tofail $commit1 &&
 	git clone --bare ./. victim.git &&
 	GIT_DIR=victim.git git update-ref refs/heads/tofail $commit1 &&
-	git update-ref refs/heads/master $commit1 &&
-	git update-ref refs/heads/tofail $commit0
-'
-
-cat >victim.git/hooks/pre-receive <<'EOF'
-#!/bin/sh
-printf %s "$@" >>$GIT_DIR/pre-receive.args
-cat - >$GIT_DIR/pre-receive.stdin
-echo STDOUT pre-receive
-echo STDERR pre-receive >&2
-EOF
-chmod u+x victim.git/hooks/pre-receive
+	git update-ref refs/heads/main $commit1 &&
+	git update-ref refs/heads/tofail $commit0 &&
+
+	test_hook --setup -C victim.git pre-receive <<-\EOF &&
+	printf %s "$@" >>$GIT_DIR/pre-receive.args
+	cat - >$GIT_DIR/pre-receive.stdin
+	echo STDOUT pre-receive
+	echo STDERR pre-receive >&2
+	EOF
 
-cat >victim.git/hooks/update <<'EOF'
-#!/bin/sh
-echo "$@" >>$GIT_DIR/update.args
-read x; printf %s "$x" >$GIT_DIR/update.stdin
-echo STDOUT update $1
-echo STDERR update $1 >&2
-test "$1" = refs/heads/master || exit
-EOF
-chmod u+x victim.git/hooks/update
+	test_hook --setup -C victim.git update <<-\EOF &&
+	echo "$@" >>$GIT_DIR/update.args
+	read x; printf %s "$x" >$GIT_DIR/update.stdin
+	echo STDOUT update $1
+	echo STDERR update $1 >&2
+	test "$1" = refs/heads/main || exit
+	EOF
 
-cat >victim.git/hooks/post-receive <<'EOF'
-#!/bin/sh
-printf %s "$@" >>$GIT_DIR/post-receive.args
-cat - >$GIT_DIR/post-receive.stdin
-echo STDOUT post-receive
-echo STDERR post-receive >&2
-EOF
-chmod u+x victim.git/hooks/post-receive
+	test_hook --setup -C victim.git post-receive <<-\EOF &&
+	printf %s "$@" >>$GIT_DIR/post-receive.args
+	cat - >$GIT_DIR/post-receive.stdin
+	echo STDOUT post-receive
+	echo STDERR post-receive >&2
+	EOF
 
-cat >victim.git/hooks/post-update <<'EOF'
-#!/bin/sh
-echo "$@" >>$GIT_DIR/post-update.args
-read x; printf %s "$x" >$GIT_DIR/post-update.stdin
-echo STDOUT post-update
-echo STDERR post-update >&2
-EOF
-chmod u+x victim.git/hooks/post-update
+	test_hook --setup -C victim.git post-update <<-\EOF
+	echo "$@" >>$GIT_DIR/post-update.args
+	read x; printf %s "$x" >$GIT_DIR/post-update.stdin
+	echo STDOUT post-update
+	echo STDERR post-update >&2
+	EOF
+'
 
 test_expect_success push '
 	test_must_fail git send-pack --force ./victim.git \
-		master tofail >send.out 2>send.err
+		main tofail >send.out 2>send.err
 '
 
 test_expect_success 'updated as expected' '
-	test $(GIT_DIR=victim.git git rev-parse master) = $commit1 &&
+	test $(GIT_DIR=victim.git git rev-parse main) = $commit1 &&
 	test $(GIT_DIR=victim.git git rev-parse tofail) = $commit1
 '
 
@@ -82,24 +74,24 @@ test_expect_success 'hooks ran' '
 '
 
 test_expect_success 'pre-receive hook input' '
-	(echo $commit0 $commit1 refs/heads/master &&
+	(echo $commit0 $commit1 refs/heads/main &&
 	 echo $commit1 $commit0 refs/heads/tofail
 	) | test_cmp - victim.git/pre-receive.stdin
 '
 
 test_expect_success 'update hook arguments' '
-	(echo refs/heads/master $commit0 $commit1 &&
+	(echo refs/heads/main $commit0 $commit1 &&
 	 echo refs/heads/tofail $commit1 $commit0
 	) | test_cmp - victim.git/update.args
 '
 
 test_expect_success 'post-receive hook input' '
-	echo $commit0 $commit1 refs/heads/master |
+	echo $commit0 $commit1 refs/heads/main |
 	test_cmp - victim.git/post-receive.stdin
 '
 
 test_expect_success 'post-update hook arguments' '
-	echo refs/heads/master |
+	echo refs/heads/main |
 	test_cmp - victim.git/post-update.args
 '
 
@@ -120,8 +112,8 @@ test_expect_success 'send-pack produced no output' '
 cat <<EOF >expect
 remote: STDOUT pre-receive
 remote: STDERR pre-receive
-remote: STDOUT update refs/heads/master
-remote: STDERR update refs/heads/master
+remote: STDOUT update refs/heads/main
+remote: STDERR update refs/heads/main
 remote: STDOUT update refs/heads/tofail
 remote: STDERR update refs/heads/tofail
 remote: error: hook declined to update refs/heads/tofail
@@ -131,20 +123,18 @@ remote: STDOUT post-update
 remote: STDERR post-update
 EOF
 test_expect_success 'send-pack stderr contains hook messages' '
-	grep ^remote: send.err | sed "s/ *\$//" >actual &&
+	sed -n "/^remote:/s/ *\$//p" send.err >actual &&
 	test_cmp expect actual
 '
 
 test_expect_success 'pre-receive hook that forgets to read its input' '
-	write_script victim.git/hooks/pre-receive <<-\EOF &&
+	test_hook --clobber -C victim.git pre-receive <<-\EOF &&
 	exit 0
 	EOF
 	rm -f victim.git/hooks/update victim.git/hooks/post-update &&
 
-	for v in $(test_seq 100 999)
-	do
-		git branch branch_$v master || return
-	done &&
+	printf "create refs/heads/branch_%d main\n" $(test_seq 100 999) >input &&
+	git update-ref --stdin <input &&
 	git push ./victim.git "+refs/heads/*:refs/heads/*"
 '
 
diff --git a/t/t5402-post-merge-hook.sh b/t/t5402-post-merge-hook.sh
index 6eb2ffd..46ebdfb 100755
--- a/t/t5402-post-merge-hook.sh
+++ b/t/t5402-post-merge-hook.sh
@@ -4,6 +4,10 @@
 #
 
 test_description='Test the post-merge hook.'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -15,42 +19,44 @@ test_expect_success setup '
 	git update-index a &&
 	tree1=$(git write-tree) &&
 	commit1=$(echo modify | git commit-tree $tree1 -p $commit0) &&
-        git update-ref refs/heads/master $commit0 &&
+	git update-ref refs/heads/main $commit0 &&
 	git clone ./. clone1 &&
 	GIT_DIR=clone1/.git git update-index --add a &&
 	git clone ./. clone2 &&
 	GIT_DIR=clone2/.git git update-index --add a
 '
 
-for clone in 1 2; do
-    cat >clone${clone}/.git/hooks/post-merge <<'EOF'
-#!/bin/sh
-echo $@ >> $GIT_DIR/post-merge.args
-EOF
-    chmod u+x clone${clone}/.git/hooks/post-merge
-done
+test_expect_success 'setup clone hooks' '
+	test_when_finished "rm -f hook" &&
+	cat >hook <<-\EOF &&
+	echo $@ >>$GIT_DIR/post-merge.args
+	EOF
+
+	test_hook --setup -C clone1 post-merge <hook &&
+	test_hook --setup -C clone2 post-merge <hook
+'
 
 test_expect_success 'post-merge does not run for up-to-date ' '
-        GIT_DIR=clone1/.git git merge $commit0 &&
+	GIT_DIR=clone1/.git git merge $commit0 &&
 	! test -f clone1/.git/post-merge.args
 '
 
 test_expect_success 'post-merge runs as expected ' '
-        GIT_DIR=clone1/.git git merge $commit1 &&
+	GIT_DIR=clone1/.git git merge $commit1 &&
 	test -e clone1/.git/post-merge.args
 '
 
 test_expect_success 'post-merge from normal merge receives the right argument ' '
-        grep 0 clone1/.git/post-merge.args
+	grep 0 clone1/.git/post-merge.args
 '
 
 test_expect_success 'post-merge from squash merge runs as expected ' '
-        GIT_DIR=clone2/.git git merge --squash $commit1 &&
+	GIT_DIR=clone2/.git git merge --squash $commit1 &&
 	test -e clone2/.git/post-merge.args
 '
 
 test_expect_success 'post-merge from squash merge receives the right argument ' '
-        grep 1 clone2/.git/post-merge.args
+	grep 1 clone2/.git/post-merge.args
 '
 
 test_done
diff --git a/t/t5403-post-checkout-hook.sh b/t/t5403-post-checkout-hook.sh
index a39b3b5..cfaae54 100755
--- a/t/t5403-post-checkout-hook.sh
+++ b/t/t5403-post-checkout-hook.sh
@@ -4,11 +4,14 @@
 #
 
 test_description='Test the post-checkout hook.'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
-	mkdir -p .git/hooks &&
-	write_script .git/hooks/post-checkout <<-\EOF &&
+	test_hook --setup post-checkout <<-\EOF &&
 	echo "$@" >.git/post-checkout.args
 	EOF
 	test_commit one &&
@@ -20,7 +23,7 @@ test_expect_success setup '
 
 test_expect_success 'post-checkout receives the right arguments with HEAD unchanged ' '
 	test_when_finished "rm -f .git/post-checkout.args" &&
-	git checkout master &&
+	git checkout main &&
 	read old new flag <.git/post-checkout.args &&
 	test $old = $new && test $flag = 1
 '
@@ -41,28 +44,65 @@ test_expect_success 'post-checkout receives the right args with HEAD changed ' '
 
 test_expect_success 'post-checkout receives the right args when not switching branches ' '
 	test_when_finished "rm -f .git/post-checkout.args" &&
-	git checkout master -- three.t &&
+	git checkout main -- three.t &&
 	read old new flag <.git/post-checkout.args &&
 	test $old = $new && test $flag = 0
 '
 
-test_expect_success 'post-checkout is triggered on rebase' '
-	test_when_finished "rm -f .git/post-checkout.args" &&
-	git checkout -b rebase-test master &&
-	rm -f .git/post-checkout.args &&
-	git rebase rebase-on-me &&
-	read old new flag <.git/post-checkout.args &&
-	test $old != $new && test $flag = 1
-'
+test_rebase () {
+	args="$*" &&
+	test_expect_success "post-checkout is triggered on rebase $args" '
+		test_when_finished "rm -f .git/post-checkout.args" &&
+		git checkout -B rebase-test main &&
+		rm -f .git/post-checkout.args &&
+		git rebase $args rebase-on-me &&
+		read old new flag <.git/post-checkout.args &&
+		test_cmp_rev main $old &&
+		test_cmp_rev rebase-on-me $new &&
+		test $flag = 1
+	'
+
+	test_expect_success "post-checkout is triggered on rebase $args with fast-forward" '
+		test_when_finished "rm -f .git/post-checkout.args" &&
+		git checkout -B ff-rebase-test rebase-on-me^ &&
+		rm -f .git/post-checkout.args &&
+		git rebase $args rebase-on-me &&
+		read old new flag <.git/post-checkout.args &&
+		test_cmp_rev rebase-on-me^ $old &&
+		test_cmp_rev rebase-on-me $new &&
+		test $flag = 1
+	'
+
+	test_expect_success "rebase $args fast-forward branch checkout runs post-checkout hook" '
+		test_when_finished "test_might_fail git rebase --abort" &&
+		test_when_finished "rm -f .git/post-checkout.args" &&
+		git update-ref refs/heads/rebase-fast-forward three &&
+		git checkout two  &&
+		rm -f .git/post-checkout.args &&
+		git rebase $args HEAD rebase-fast-forward  &&
+		read old new flag <.git/post-checkout.args &&
+		test_cmp_rev two $old &&
+		test_cmp_rev three $new &&
+		test $flag = 1
+	'
+
+	test_expect_success "rebase $args checkout does not remove untracked files" '
+		test_when_finished "test_might_fail git rebase --abort" &&
+		test_when_finished "rm -f .git/post-checkout.args" &&
+		git update-ref refs/heads/rebase-fast-forward three &&
+		git checkout two &&
+		rm -f .git/post-checkout.args &&
+		echo untracked >three.t &&
+		test_when_finished "rm three.t" &&
+		test_must_fail git rebase $args HEAD rebase-fast-forward 2>err &&
+		grep "untracked working tree files would be overwritten by checkout" err &&
+		test_path_is_missing .git/post-checkout.args
 
-test_expect_success 'post-checkout is triggered on rebase with fast-forward' '
-	test_when_finished "rm -f .git/post-checkout.args" &&
-	git checkout -b ff-rebase-test rebase-on-me^ &&
-	rm -f .git/post-checkout.args &&
-	git rebase rebase-on-me &&
-	read old new flag <.git/post-checkout.args &&
-	test $old != $new && test $flag = 1
 '
+}
+
+test_rebase --apply &&
+test_rebase --merge
 
 test_expect_success 'post-checkout hook is triggered by clone' '
 	mkdir -p templates/hooks &&
diff --git a/t/t5404-tracking-branches.sh b/t/t5404-tracking-branches.sh
index 2762f42..51737ee 100755
--- a/t/t5404-tracking-branches.sh
+++ b/t/t5404-tracking-branches.sh
@@ -2,6 +2,10 @@
 
 test_description='tracking branch update checks for git push'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -30,9 +34,9 @@ test_expect_success 'prepare pushable branches' '
 	git checkout -b b2 origin/b2 &&
 	echo aa-b2 >>file &&
 	git commit -a -m aa-b2 &&
-	git checkout master &&
-	echo aa-master >>file &&
-	git commit -a -m aa-master
+	git checkout main &&
+	echo aa-main >>file &&
+	git commit -a -m aa-main
 '
 
 test_expect_success 'mixed-success push returns error' '
@@ -40,7 +44,7 @@ test_expect_success 'mixed-success push returns error' '
 '
 
 test_expect_success 'check tracking branches updated correctly after push' '
-	test "$(git rev-parse origin/master)" = "$(git rev-parse master)"
+	test "$(git rev-parse origin/main)" = "$(git rev-parse main)"
 '
 
 test_expect_success 'check tracking branches not updated for failed refs' '
diff --git a/t/t5405-send-pack-rewind.sh b/t/t5405-send-pack-rewind.sh
index 235fb76..1686ac1 100755
--- a/t/t5405-send-pack-rewind.sh
+++ b/t/t5405-send-pack-rewind.sh
@@ -2,6 +2,10 @@
 
 test_description='forced push to replace commit we do not have'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -13,7 +17,7 @@ test_expect_success setup '
 	mkdir another && (
 		cd another &&
 		git init &&
-		git fetch --update-head-ok .. master:master
+		git fetch --update-head-ok .. main:main
 	) &&
 
 	>file2 && git add file2 && test_tick &&
@@ -25,7 +29,7 @@ test_expect_success 'non forced push should die not segfault' '
 
 	(
 		cd another &&
-		test_must_fail git push .. master:master
+		test_must_fail git push .. main:main
 	)
 
 '
@@ -34,7 +38,7 @@ test_expect_success 'forced push should succeed' '
 
 	(
 		cd another &&
-		git push .. +master:master
+		git push .. +main:main
 	)
 
 '
diff --git a/t/t5406-remote-rejects.sh b/t/t5406-remote-rejects.sh
index ff06f99..d6a9946 100755
--- a/t/t5406-remote-rejects.sh
+++ b/t/t5406-remote-rejects.sh
@@ -2,11 +2,11 @@
 
 test_description='remote push rejects are reported by client'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
-	mkdir .git/hooks &&
-	write_script .git/hooks/update <<-\EOF &&
+	test_hook update <<-\EOF &&
 	exit 1
 	EOF
 	echo 1 >file &&
diff --git a/t/t5407-post-rewrite-hook.sh b/t/t5407-post-rewrite-hook.sh
index 80750a8..ad7f8c6 100755
--- a/t/t5407-post-rewrite-hook.sh
+++ b/t/t5407-post-rewrite-hook.sh
@@ -4,6 +4,9 @@
 #
 
 test_description='Test the post-rewrite hook.'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -14,17 +17,19 @@ test_expect_success 'setup' '
 	git checkout A^0 &&
 	test_commit E bar E &&
 	test_commit F foo F &&
-	git checkout master
-'
-
-mkdir .git/hooks
+	git checkout B &&
+	git merge E &&
+	git tag merge-E &&
+	test_commit G G &&
+	test_commit H H &&
+	test_commit I I &&
+	git checkout main &&
 
-cat >.git/hooks/post-rewrite <<EOF
-#!/bin/sh
-echo \$@ > "$TRASH_DIRECTORY"/post-rewrite.args
-cat > "$TRASH_DIRECTORY"/post-rewrite.data
-EOF
-chmod u+x .git/hooks/post-rewrite
+	test_hook --setup post-rewrite <<-EOF
+	echo \$@ > "$TRASH_DIRECTORY"/post-rewrite.args
+	cat > "$TRASH_DIRECTORY"/post-rewrite.data
+	EOF
+'
 
 clear_hook_input () {
 	rm -f post-rewrite.args post-rewrite.data
@@ -174,6 +179,48 @@ test_fail_interactive_rebase () {
 	)
 }
 
+test_expect_success 'git rebase with failed pick' '
+	clear_hook_input &&
+	cat >todo <<-\EOF &&
+	exec >bar
+	merge -C merge-E E
+	exec >G
+	pick G
+	exec >H 2>I
+	pick H
+	fixup I
+	EOF
+
+	(
+		set_replace_editor todo &&
+		test_must_fail git rebase -i D D 2>err
+	) &&
+	grep "would be overwritten" err &&
+	rm bar &&
+
+	test_must_fail git rebase --continue 2>err &&
+	grep "would be overwritten" err &&
+	rm G &&
+
+	test_must_fail git rebase --continue 2>err &&
+	grep "would be overwritten" err &&
+	rm H &&
+
+	test_must_fail git rebase --continue 2>err &&
+	grep "would be overwritten" err &&
+	rm I &&
+
+	git rebase --continue &&
+	echo rebase >expected.args &&
+	cat >expected.data <<-EOF &&
+	$(git rev-parse merge-E) $(git rev-parse HEAD~2)
+	$(git rev-parse G) $(git rev-parse HEAD~1)
+	$(git rev-parse H) $(git rev-parse HEAD)
+	$(git rev-parse I) $(git rev-parse HEAD)
+	EOF
+	verify_hook_input
+'
+
 test_expect_success 'git rebase -i (unchanged)' '
 	git reset --hard D &&
 	clear_hook_input &&
diff --git a/t/t5409-colorize-remote-messages.sh b/t/t5409-colorize-remote-messages.sh
index 5d8f401..fa5de45 100755
--- a/t/t5409-colorize-remote-messages.sh
+++ b/t/t5409-colorize-remote-messages.sh
@@ -5,8 +5,7 @@ test_description='remote messages are colorized on the client'
 . ./test-lib.sh
 
 test_expect_success 'setup' '
-	mkdir .git/hooks &&
-	write_script .git/hooks/update <<-\EOF &&
+	test_hook --setup update <<-\EOF &&
 	echo error: error
 	echo ERROR: also highlighted
 	echo hint: hint
diff --git a/t/t5410-receive-pack-alternates.sh b/t/t5410-receive-pack-alternates.sh
index f00d0da..7a45d4c 100755
--- a/t/t5410-receive-pack-alternates.sh
+++ b/t/t5410-receive-pack-alternates.sh
@@ -2,14 +2,18 @@
 
 test_description='git receive-pack with alternate ref filtering'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
 	test_commit base &&
 	git clone -s --bare . fork &&
-	git checkout -b public/branch master &&
+	git checkout -b public/branch main &&
 	test_commit public &&
-	git checkout -b private/branch master &&
+	git checkout -b private/branch main &&
 	test_commit private
 '
 
diff --git a/t/t5411-proc-receive-hook.sh b/t/t5411-proc-receive-hook.sh
new file mode 100755
index 0000000..92cf52c
--- /dev/null
+++ b/t/t5411-proc-receive-hook.sh
@@ -0,0 +1,120 @@
+#!/bin/sh
+#
+# Copyright (c) 2020 Jiang Xin
+#
+
+test_description='Test proc-receive hook'
+
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+. ./test-lib.sh
+
+. "$TEST_DIRECTORY"/t5411/common-functions.sh
+
+setup_upstream_and_workbench () {
+	# Refs of upstream : main(A)
+	# Refs of workbench: main(A)  tags/v123
+	test_expect_success "setup upstream and workbench" '
+		rm -rf upstream.git &&
+		rm -rf workbench &&
+		git init --bare upstream.git &&
+		git init workbench &&
+		create_commits_in workbench A B &&
+		(
+			cd workbench &&
+			# Try to make a stable fixed width for abbreviated commit ID,
+			# this fixed-width oid will be replaced with "<OID>".
+			git config core.abbrev 7 &&
+			git tag -m "v123" v123 $A &&
+			git remote add origin ../upstream.git &&
+			git push origin main &&
+			git update-ref refs/heads/main $A $B &&
+			git -C ../upstream.git update-ref \
+				refs/heads/main $A $B
+		) &&
+		TAG=$(git -C workbench rev-parse v123) &&
+
+		# setup pre-receive hook
+		test_hook --setup -C upstream.git pre-receive <<-\EOF &&
+		exec >&2
+		echo "# pre-receive hook"
+		while read old new ref
+		do
+			echo "pre-receive< $old $new $ref"
+		done
+		EOF
+
+		# setup post-receive hook
+		test_hook --setup -C upstream.git post-receive <<-\EOF &&
+		exec >&2
+		echo "# post-receive hook"
+		while read old new ref
+		do
+			echo "post-receive< $old $new $ref"
+		done
+		EOF
+
+		upstream=upstream.git
+	'
+}
+
+run_proc_receive_hook_test() {
+	case $1 in
+	http)
+		PROTOCOL="HTTP protocol"
+		URL_PREFIX="http://.*"
+		;;
+	local)
+		PROTOCOL="builtin protocol"
+		URL_PREFIX="\.\."
+		;;
+	esac
+
+	# Include test cases for both file and HTTP protocol
+	for t in  "$TEST_DIRECTORY"/t5411/test-*.sh
+	do
+		. "$t"
+	done
+}
+
+# Initialize the upstream repository and local workbench.
+setup_upstream_and_workbench
+
+# Load test cases that only need to be executed once.
+for t in  "$TEST_DIRECTORY"/t5411/once-*.sh
+do
+	. "$t"
+done
+
+# Initialize the upstream repository and local workbench.
+setup_upstream_and_workbench
+
+# Run test cases for 'proc-receive' hook on local file protocol.
+run_proc_receive_hook_test local
+
+ROOT_PATH="$PWD"
+. "$TEST_DIRECTORY"/lib-gpg.sh
+. "$TEST_DIRECTORY"/lib-httpd.sh
+. "$TEST_DIRECTORY"/lib-terminal.sh
+start_httpd
+
+# Re-initialize the upstream repository and local workbench.
+setup_upstream_and_workbench
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+test_expect_success "setup for HTTP protocol" '
+	git -C upstream.git config http.receivepack true &&
+	upstream="$HTTPD_DOCUMENT_ROOT_PATH/upstream.git" &&
+	mv upstream.git "$upstream" &&
+	git -C workbench remote set-url origin "$HTTPD_URL/auth-push/smart/upstream.git" &&
+	set_askpass user@host pass@host
+'
+
+setup_askpass_helper
+
+# Run test cases for 'proc-receive' hook on HTTP protocol.
+run_proc_receive_hook_test http
+
+test_done
diff --git a/t/t5411/common-functions.sh b/t/t5411/common-functions.sh
new file mode 100644
index 0000000..3c74778
--- /dev/null
+++ b/t/t5411/common-functions.sh
@@ -0,0 +1,73 @@
+# Create commits in <repo> and assign each commit's oid to shell variables
+# given in the arguments (A, B, and C). E.g.:
+#
+#     create_commits_in <repo> A B C
+#
+# NOTE: Never calling this function from a subshell since variable
+# assignments will disappear when subshell exits.
+create_commits_in () {
+	repo="$1" && test -d "$repo" ||
+	error "Repository $repo does not exist."
+	shift &&
+	while test $# -gt 0
+	do
+		name=$1 &&
+		shift &&
+		test_commit -C "$repo" --no-tag "$name" &&
+		eval $name=$(git -C "$repo" rev-parse HEAD)
+	done
+}
+
+get_abbrev_oid () {
+	oid=$1 &&
+	suffix=${oid#???????} &&
+	oid=${oid%$suffix} &&
+	if test -n "$oid"
+	then
+		echo "$oid"
+	else
+		echo "undefined-oid"
+	fi
+}
+
+# Format the output of git-push, git-show-ref and other commands to make a
+# user-friendly and stable text.  We can easily prepare the expect text
+# without having to worry about changes of the commit ID (full or abbrev.)
+# of the output.  Single quotes are replaced with double quotes, because
+# it is boring to prepare unquoted single quotes in expect text.  We also
+# remove some locale error messages. The emitted human-readable errors are
+# redundant to the more machine-readable output the tests already assert.
+make_user_friendly_and_stable_output () {
+	sed \
+		-e "s/'/\"/g" \
+		-e "s/$(get_abbrev_oid $A)[0-9a-f]*/<COMMIT-A>/g" \
+		-e "s/$(get_abbrev_oid $B)[0-9a-f]*/<COMMIT-B>/g" \
+		-e "s/$(get_abbrev_oid $TAG)[0-9a-f]*/<TAG-v123>/g" \
+		-e "s/$ZERO_OID/<ZERO-OID>/g" \
+		-e "s#To $URL_PREFIX/upstream.git#To <URL/of/upstream.git>#" \
+		-e "/^error: / d"
+}
+
+filter_out_user_friendly_and_stable_output () {
+	make_user_friendly_and_stable_output |
+		sed -n ${1+"$@"}
+}
+
+format_and_save_expect () {
+	sed -e 's/^> //' -e 's/Z$//' >expect
+}
+
+test_cmp_refs () {
+	indir=
+	if test "$1" = "-C"
+	then
+		shift
+		indir="$1"
+		shift
+	fi
+	indir=${indir:+"$indir"/}
+	cat >show-ref.expect &&
+	git ${indir:+ -C "$indir"} show-ref >show-ref.pristine &&
+	make_user_friendly_and_stable_output <show-ref.pristine >show-ref.filtered &&
+	test_cmp show-ref.expect show-ref.filtered
+}
diff --git a/t/t5411/once-0010-report-status-v1.sh b/t/t5411/once-0010-report-status-v1.sh
new file mode 100644
index 0000000..f9ffb01
--- /dev/null
+++ b/t/t5411/once-0010-report-status-v1.sh
@@ -0,0 +1,91 @@
+test_expect_success "setup receive.procReceiveRefs" '
+	git -C "$upstream" config --add receive.procReceiveRefs refs/for
+'
+
+test_expect_success "setup proc-receive hook" '
+	test_hook -C "$upstream" --clobber proc-receive <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/main/topic1" \
+		-r "option fall-through" \
+		-r "ok refs/for/main/topic2" \
+		-r "option refname refs/for/changes/23/123/1" \
+		-r "option new-oid $A" \
+		-r "ok refs/for/main/topic2" \
+		-r "option refname refs/for/changes/24/124/2" \
+		-r "option old-oid $B" \
+		-r "option new-oid $A" \
+		-r "option forced-update" \
+		-r "ng refs/for/next/topic target branch not exist"
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         : (B)                   refs/for/main/topic1(A)  foo(A)  refs/for/next/topic(A)  refs/for/main/topic2(A)
+test_expect_success "proc-receive: report status v1" '
+	{
+		if test -z "$GIT_DEFAULT_HASH" || test "$GIT_DEFAULT_HASH" = "sha1"
+		then
+			printf "%s %s refs/heads/main\0report-status\n" \
+				$A $B | packetize_raw
+		else
+			printf "%s %s refs/heads/main\0report-status object-format=$GIT_DEFAULT_HASH\n" \
+				$A $B | packetize_raw
+		fi &&
+		printf "%s %s refs/for/main/topic1\n" \
+			$ZERO_OID $A | packetize &&
+		printf "%s %s refs/heads/foo\n" \
+			$ZERO_OID $A | packetize &&
+		printf "%s %s refs/for/next/topic\n" \
+			$ZERO_OID $A | packetize &&
+		printf "%s %s refs/for/main/topic2\n" \
+			$ZERO_OID $A | packetize &&
+		printf 0000 &&
+		printf "" | git -C "$upstream" pack-objects --stdout
+	} | git receive-pack "$upstream" --stateless-rpc \
+	>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	# pre-receive hook
+	pre-receive< <COMMIT-A> <COMMIT-B> refs/heads/main
+	pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic1
+	pre-receive< <ZERO-OID> <COMMIT-A> refs/heads/foo
+	pre-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic
+	pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic2
+	# proc-receive hook
+	proc-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic1
+	proc-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic
+	proc-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic2
+	proc-receive> ok refs/for/main/topic1
+	proc-receive> option fall-through
+	proc-receive> ok refs/for/main/topic2
+	proc-receive> option refname refs/for/changes/23/123/1
+	proc-receive> option new-oid <COMMIT-A>
+	proc-receive> ok refs/for/main/topic2
+	proc-receive> option refname refs/for/changes/24/124/2
+	proc-receive> option old-oid <COMMIT-B>
+	proc-receive> option new-oid <COMMIT-A>
+	proc-receive> option forced-update
+	proc-receive> ng refs/for/next/topic target branch not exist
+	000eunpack ok
+	0017ok refs/heads/main
+	001cok refs/for/main/topic1
+	0016ok refs/heads/foo
+	0033ng refs/for/next/topic target branch not exist
+	001cok refs/for/main/topic2
+	0000# post-receive hook
+	post-receive< <COMMIT-A> <COMMIT-B> refs/heads/main
+	post-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic1
+	post-receive< <ZERO-OID> <COMMIT-A> refs/heads/foo
+	post-receive< <ZERO-OID> <COMMIT-A> refs/for/changes/23/123/1
+	post-receive< <COMMIT-B> <COMMIT-A> refs/for/changes/24/124/2
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/for/main/topic1
+	<COMMIT-A> refs/heads/foo
+	<COMMIT-B> refs/heads/main
+	EOF
+'
diff --git a/t/t5411/test-0000-standard-git-push.sh b/t/t5411/test-0000-standard-git-push.sh
new file mode 100644
index 0000000..ce64bb6
--- /dev/null
+++ b/t/t5411/test-0000-standard-git-push.sh
@@ -0,0 +1,134 @@
+# Refs of upstream : main(A)  
+# Refs of workbench: main(A)  tags/v123
+# git-push         : main(B)             next(A)
+test_expect_success "git-push ($PROTOCOL)" '
+	git -C workbench push origin \
+		$B:refs/heads/main \
+		HEAD:refs/heads/next \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <COMMIT-A> <COMMIT-B> refs/heads/main        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/heads/next        Z
+	> remote: # post-receive hook        Z
+	> remote: post-receive< <COMMIT-A> <COMMIT-B> refs/heads/main        Z
+	> remote: post-receive< <ZERO-OID> <COMMIT-A> refs/heads/next        Z
+	> To <URL/of/upstream.git>
+	>    <COMMIT-A>..<COMMIT-B>  <COMMIT-B> -> main
+	>  * [new branch]      HEAD -> next
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-B> refs/heads/main
+	<COMMIT-A> refs/heads/next
+	EOF
+'
+
+# Refs of upstream : main(B)  next(A)
+# Refs of workbench: main(A)           tags/v123
+# git-push --atomic: main(A)  next(B)
+test_expect_success "git-push --atomic ($PROTOCOL)" '
+	test_must_fail git -C workbench push --atomic origin \
+		main \
+		$B:refs/heads/next \
+		>out-$test_count 2>&1 &&
+	filter_out_user_friendly_and_stable_output \
+		-e "/^To / { p; }" \
+		-e "/^ ! / { p; }" \
+		<out-$test_count >actual &&
+	format_and_save_expect <<-EOF &&
+	> To <URL/of/upstream.git>
+	>  ! [rejected]        main -> main (non-fast-forward)
+	>  ! [rejected]        <COMMIT-B> -> next (atomic push failed)
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-B> refs/heads/main
+	<COMMIT-A> refs/heads/next
+	EOF
+'
+
+# Refs of upstream : main(B)  next(A)
+# Refs of workbench: main(A)           tags/v123
+# git-push         : main(A)  next(B)
+test_expect_success "non-fast-forward git-push ($PROTOCOL)" '
+	test_must_fail git \
+		-C workbench \
+		-c advice.pushUpdateRejected=false \
+		push origin \
+		main \
+		$B:refs/heads/next \
+		>out-$test_count 2>&1 &&
+	make_user_friendly_and_stable_output <out-$test_count >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <COMMIT-A> <COMMIT-B> refs/heads/next        Z
+	> remote: # post-receive hook        Z
+	> remote: post-receive< <COMMIT-A> <COMMIT-B> refs/heads/next        Z
+	> To <URL/of/upstream.git>
+	>    <COMMIT-A>..<COMMIT-B>  <COMMIT-B> -> next
+	>  ! [rejected]        main -> main (non-fast-forward)
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-B> refs/heads/main
+	<COMMIT-B> refs/heads/next
+	EOF
+'
+
+# Refs of upstream : main(B)  next(B)
+# Refs of workbench: main(A)           tags/v123
+# git-push -f      : main(A)  NULL     tags/v123  refs/review/main/topic(A)  a/b/c(A)
+test_expect_success "git-push -f ($PROTOCOL)" '
+	git -C workbench push -f origin \
+		refs/tags/v123 \
+		:refs/heads/next \
+		main \
+		main:refs/review/main/topic \
+		HEAD:refs/heads/a/b/c \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <COMMIT-B> <COMMIT-A> refs/heads/main        Z
+	> remote: pre-receive< <COMMIT-B> <ZERO-OID> refs/heads/next        Z
+	> remote: pre-receive< <ZERO-OID> <TAG-v123> refs/tags/v123        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/review/main/topic        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/heads/a/b/c        Z
+	> remote: # post-receive hook        Z
+	> remote: post-receive< <COMMIT-B> <COMMIT-A> refs/heads/main        Z
+	> remote: post-receive< <COMMIT-B> <ZERO-OID> refs/heads/next        Z
+	> remote: post-receive< <ZERO-OID> <TAG-v123> refs/tags/v123        Z
+	> remote: post-receive< <ZERO-OID> <COMMIT-A> refs/review/main/topic        Z
+	> remote: post-receive< <ZERO-OID> <COMMIT-A> refs/heads/a/b/c        Z
+	> To <URL/of/upstream.git>
+	>  + <COMMIT-B>...<COMMIT-A> main -> main (forced update)
+	>  - [deleted]         next
+	>  * [new tag]         v123 -> v123
+	>  * [new reference]   main -> refs/review/main/topic
+	>  * [new branch]      HEAD -> a/b/c
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/a/b/c
+	<COMMIT-A> refs/heads/main
+	<COMMIT-A> refs/review/main/topic
+	<TAG-v123> refs/tags/v123
+	EOF
+'
+
+# Refs of upstream : main(A)  tags/v123  refs/review/main/topic(A)  a/b/c(A)
+# Refs of workbench: main(A)  tags/v123
+test_expect_success "cleanup ($PROTOCOL)" '
+	(
+		cd "$upstream" &&
+		git update-ref -d refs/review/main/topic &&
+		git update-ref -d refs/tags/v123 &&
+		git update-ref -d refs/heads/a/b/c
+	)
+'
diff --git a/t/t5411/test-0001-standard-git-push--porcelain.sh b/t/t5411/test-0001-standard-git-push--porcelain.sh
new file mode 100644
index 0000000..373ec3d
--- /dev/null
+++ b/t/t5411/test-0001-standard-git-push--porcelain.sh
@@ -0,0 +1,138 @@
+# Refs of upstream : main(A)  
+# Refs of workbench: main(A)  tags/v123
+# git-push         : main(B)             next(A)
+test_expect_success "git-push ($PROTOCOL/porcelain)" '
+	git -C workbench push --porcelain origin \
+		$B:refs/heads/main \
+		HEAD:refs/heads/next \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <COMMIT-A> <COMMIT-B> refs/heads/main        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/heads/next        Z
+	> remote: # post-receive hook        Z
+	> remote: post-receive< <COMMIT-A> <COMMIT-B> refs/heads/main        Z
+	> remote: post-receive< <ZERO-OID> <COMMIT-A> refs/heads/next        Z
+	> To <URL/of/upstream.git>
+	>  	<COMMIT-B>:refs/heads/main	<COMMIT-A>..<COMMIT-B>
+	> *	HEAD:refs/heads/next	[new branch]
+	> Done
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-B> refs/heads/main
+	<COMMIT-A> refs/heads/next
+	EOF
+'
+
+# Refs of upstream : main(B)  next(A)
+# Refs of workbench: main(A)           tags/v123
+# git-push --atomic: main(A)  next(B)
+test_expect_success "git-push --atomic ($PROTOCOL/porcelain)" '
+	test_must_fail git -C workbench push --atomic --porcelain origin \
+		main \
+		$B:refs/heads/next \
+		>out-$test_count 2>&1 &&
+	filter_out_user_friendly_and_stable_output \
+		-e "s/^# GETTEXT POISON #//" \
+		-e "/^To / { p; }" \
+		-e "/^!/ { p; }" \
+		<out-$test_count >actual &&
+	format_and_save_expect <<-EOF &&
+	> To <URL/of/upstream.git>
+	> !	refs/heads/main:refs/heads/main	[rejected] (non-fast-forward)
+	> !	<COMMIT-B>:refs/heads/next	[rejected] (atomic push failed)
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-B> refs/heads/main
+	<COMMIT-A> refs/heads/next
+	EOF
+'
+
+# Refs of upstream : main(B)  next(A)
+# Refs of workbench: main(A)           tags/v123
+# git-push         : main(A)  next(B)
+test_expect_success "non-fast-forward git-push ($PROTOCOL/porcelain)" '
+	test_must_fail git \
+		-C workbench \
+		-c advice.pushUpdateRejected=false \
+		push --porcelain origin \
+		main \
+		$B:refs/heads/next \
+		>out-$test_count 2>&1 &&
+	make_user_friendly_and_stable_output <out-$test_count >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <COMMIT-A> <COMMIT-B> refs/heads/next        Z
+	> remote: # post-receive hook        Z
+	> remote: post-receive< <COMMIT-A> <COMMIT-B> refs/heads/next        Z
+	> To <URL/of/upstream.git>
+	>  	<COMMIT-B>:refs/heads/next	<COMMIT-A>..<COMMIT-B>
+	> !	refs/heads/main:refs/heads/main	[rejected] (non-fast-forward)
+	> Done
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-B> refs/heads/main
+	<COMMIT-B> refs/heads/next
+	EOF
+'
+
+# Refs of upstream : main(B)  next(B)
+# Refs of workbench: main(A)           tags/v123
+# git-push -f      : main(A)  NULL     tags/v123  refs/review/main/topic(A)  a/b/c(A)
+test_expect_success "git-push -f ($PROTOCOL/porcelain)" '
+	git -C workbench push --porcelain -f origin \
+		refs/tags/v123 \
+		:refs/heads/next \
+		main \
+		main:refs/review/main/topic \
+		HEAD:refs/heads/a/b/c \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <COMMIT-B> <COMMIT-A> refs/heads/main        Z
+	> remote: pre-receive< <COMMIT-B> <ZERO-OID> refs/heads/next        Z
+	> remote: pre-receive< <ZERO-OID> <TAG-v123> refs/tags/v123        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/review/main/topic        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/heads/a/b/c        Z
+	> remote: # post-receive hook        Z
+	> remote: post-receive< <COMMIT-B> <COMMIT-A> refs/heads/main        Z
+	> remote: post-receive< <COMMIT-B> <ZERO-OID> refs/heads/next        Z
+	> remote: post-receive< <ZERO-OID> <TAG-v123> refs/tags/v123        Z
+	> remote: post-receive< <ZERO-OID> <COMMIT-A> refs/review/main/topic        Z
+	> remote: post-receive< <ZERO-OID> <COMMIT-A> refs/heads/a/b/c        Z
+	> To <URL/of/upstream.git>
+	> +	refs/heads/main:refs/heads/main	<COMMIT-B>...<COMMIT-A> (forced update)
+	> -	:refs/heads/next	[deleted]
+	> *	refs/tags/v123:refs/tags/v123	[new tag]
+	> *	refs/heads/main:refs/review/main/topic	[new reference]
+	> *	HEAD:refs/heads/a/b/c	[new branch]
+	> Done
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/a/b/c
+	<COMMIT-A> refs/heads/main
+	<COMMIT-A> refs/review/main/topic
+	<TAG-v123> refs/tags/v123
+	EOF
+'
+
+# Refs of upstream : main(A)  tags/v123  refs/review/main/topic(A)  a/b/c(A)
+# Refs of workbench: main(A)  tags/v123
+test_expect_success "cleanup ($PROTOCOL/porcelain)" '
+	(
+		cd "$upstream" &&
+		git update-ref -d refs/review/main/topic &&
+		git update-ref -d refs/tags/v123 &&
+		git update-ref -d refs/heads/a/b/c
+	)
+'
diff --git a/t/t5411/test-0002-pre-receive-declined.sh b/t/t5411/test-0002-pre-receive-declined.sh
new file mode 100644
index 0000000..98a9d13
--- /dev/null
+++ b/t/t5411/test-0002-pre-receive-declined.sh
@@ -0,0 +1,31 @@
+test_expect_success "setup pre-receive hook ($PROTOCOL)" '
+	mv "$upstream/hooks/pre-receive" "$upstream/hooks/pre-receive.ok" &&
+	test_hook -C "$upstream" --clobber pre-receive <<-\EOF
+	exit 1
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git-push         : main(B)             next(A)
+test_expect_success "git-push is declined ($PROTOCOL)" '
+	test_must_fail git -C workbench push origin \
+		$B:refs/heads/main \
+		HEAD:refs/heads/next \
+		>out-$test_count 2>&1 &&
+	make_user_friendly_and_stable_output <out-$test_count >actual &&
+	cat >expect <<-EOF &&
+	To <URL/of/upstream.git>
+	 ! [remote rejected] <COMMIT-B> -> main (pre-receive hook declined)
+	 ! [remote rejected] HEAD -> next (pre-receive hook declined)
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-\EOF
+	<COMMIT-A> refs/heads/main
+	EOF
+'
+
+test_expect_success "cleanup ($PROTOCOL)" '
+	mv "$upstream/hooks/pre-receive.ok" "$upstream/hooks/pre-receive"
+'
diff --git a/t/t5411/test-0003-pre-receive-declined--porcelain.sh b/t/t5411/test-0003-pre-receive-declined--porcelain.sh
new file mode 100644
index 0000000..67ca6dc
--- /dev/null
+++ b/t/t5411/test-0003-pre-receive-declined--porcelain.sh
@@ -0,0 +1,32 @@
+test_expect_success "setup pre-receive hook ($PROTOCOL/porcelain)" '
+	mv "$upstream/hooks/pre-receive" "$upstream/hooks/pre-receive.ok" &&
+	test_hook -C "$upstream" --clobber pre-receive <<-\EOF
+	exit 1
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git-push         : main(B)             next(A)
+test_expect_success "git-push is declined ($PROTOCOL/porcelain)" '
+	test_must_fail git -C workbench push --porcelain origin \
+		$B:refs/heads/main \
+		HEAD:refs/heads/next \
+		>out-$test_count 2>&1 &&
+	make_user_friendly_and_stable_output <out-$test_count >actual &&
+	format_and_save_expect <<-EOF &&
+	> To <URL/of/upstream.git>
+	> !	<COMMIT-B>:refs/heads/main	[remote rejected] (pre-receive hook declined)
+	> !	HEAD:refs/heads/next	[remote rejected] (pre-receive hook declined)
+	Done
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/main
+	EOF
+'
+
+test_expect_success "cleanup ($PROTOCOL/porcelain)" '
+	mv "$upstream/hooks/pre-receive.ok" "$upstream/hooks/pre-receive"
+'
diff --git a/t/t5411/test-0010-proc-receive-settings.sh b/t/t5411/test-0010-proc-receive-settings.sh
new file mode 100644
index 0000000..a368099
--- /dev/null
+++ b/t/t5411/test-0010-proc-receive-settings.sh
@@ -0,0 +1,7 @@
+test_expect_success "add two receive.procReceiveRefs settings" '
+	(
+		cd "$upstream" &&
+		git config --add receive.procReceiveRefs refs/for &&
+		git config --add receive.procReceiveRefs refs/review/
+	)
+'
diff --git a/t/t5411/test-0011-no-hook-error.sh b/t/t5411/test-0011-no-hook-error.sh
new file mode 100644
index 0000000..d35002b
--- /dev/null
+++ b/t/t5411/test-0011-no-hook-error.sh
@@ -0,0 +1,60 @@
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       next(A)  refs/for/main/topic(A)
+test_expect_success "proc-receive: no hook, fail to push special ref ($PROTOCOL)" '
+	test_must_fail git -C workbench push origin \
+		HEAD:next \
+		HEAD:refs/for/main/topic \
+		>out-$test_count 2>&1 &&
+	make_user_friendly_and_stable_output <out-$test_count >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/heads/next        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: error: cannot find hook "proc-receive"        Z
+	> remote: # post-receive hook        Z
+	> remote: post-receive< <ZERO-OID> <COMMIT-A> refs/heads/next        Z
+	> To <URL/of/upstream.git>
+	>  * [new branch]      HEAD -> next
+	>  ! [remote rejected] HEAD -> refs/for/main/topic (fail to run proc-receive hook)
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/main
+	<COMMIT-A> refs/heads/next
+	EOF
+'
+
+# Refs of upstream : main(A)             next(A)
+# Refs of workbench: main(A)  tags/v123
+test_expect_success "cleanup ($PROTOCOL)" '
+	git -C "$upstream" update-ref -d refs/heads/next
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push --atomic: (B)                   next(A)  refs/for/main/topic(A)
+test_expect_success "proc-receive: no hook, all failed for atomic push ($PROTOCOL)" '
+	test_must_fail git -C workbench push --atomic origin \
+		$B:main \
+		HEAD:next \
+		HEAD:refs/for/main/topic >out-$test_count 2>&1 &&
+	make_user_friendly_and_stable_output <out-$test_count >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <COMMIT-A> <COMMIT-B> refs/heads/main        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/heads/next        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: error: cannot find hook "proc-receive"        Z
+	> To <URL/of/upstream.git>
+	>  ! [remote rejected] <COMMIT-B> -> main (fail to run proc-receive hook)
+	>  ! [remote rejected] HEAD -> next (fail to run proc-receive hook)
+	>  ! [remote rejected] HEAD -> refs/for/main/topic (fail to run proc-receive hook)
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/main
+	EOF
+'
diff --git a/t/t5411/test-0012-no-hook-error--porcelain.sh b/t/t5411/test-0012-no-hook-error--porcelain.sh
new file mode 100644
index 0000000..04468b5
--- /dev/null
+++ b/t/t5411/test-0012-no-hook-error--porcelain.sh
@@ -0,0 +1,62 @@
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       next(A)  refs/for/main/topic(A)
+test_expect_success "proc-receive: no hook, fail to push special ref ($PROTOCOL/porcelain)" '
+	test_must_fail git -C workbench push --porcelain origin \
+		HEAD:next \
+		HEAD:refs/for/main/topic \
+		>out-$test_count 2>&1 &&
+	make_user_friendly_and_stable_output <out-$test_count >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/heads/next        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: error: cannot find hook "proc-receive"        Z
+	> remote: # post-receive hook        Z
+	> remote: post-receive< <ZERO-OID> <COMMIT-A> refs/heads/next        Z
+	> To <URL/of/upstream.git>
+	> *	HEAD:refs/heads/next	[new branch]
+	> !	HEAD:refs/for/main/topic	[remote rejected] (fail to run proc-receive hook)
+	Done
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/main
+	<COMMIT-A> refs/heads/next
+	EOF
+'
+
+# Refs of upstream : main(A)             next(A)
+# Refs of workbench: main(A)  tags/v123
+test_expect_success "cleanup ($PROTOCOL/porcelain)" '
+	git -C "$upstream" update-ref -d refs/heads/next
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push --atomic: (B)                   next(A)  refs/for/main/topic(A)
+test_expect_success "proc-receive: no hook, all failed for atomic push ($PROTOCOL/porcelain)" '
+	test_must_fail git -C workbench push --porcelain --atomic origin \
+		$B:main \
+		HEAD:next \
+		HEAD:refs/for/main/topic >out-$test_count 2>&1 &&
+	make_user_friendly_and_stable_output <out-$test_count >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <COMMIT-A> <COMMIT-B> refs/heads/main        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/heads/next        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: error: cannot find hook "proc-receive"        Z
+	> To <URL/of/upstream.git>
+	> !	<COMMIT-B>:refs/heads/main	[remote rejected] (fail to run proc-receive hook)
+	> !	HEAD:refs/heads/next	[remote rejected] (fail to run proc-receive hook)
+	> !	HEAD:refs/for/main/topic	[remote rejected] (fail to run proc-receive hook)
+	> Done
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/main
+	EOF
+'
diff --git a/t/t5411/test-0013-bad-protocol.sh b/t/t5411/test-0013-bad-protocol.sh
new file mode 100644
index 0000000..8d22e17
--- /dev/null
+++ b/t/t5411/test-0013-bad-protocol.sh
@@ -0,0 +1,302 @@
+test_expect_success "setup proc-receive hook (unknown version, $PROTOCOL)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-\EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v --version 2
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       refs/for/main/topic(A)
+test_expect_success "proc-receive: bad protocol (unknown version, $PROTOCOL)" '
+	test_must_fail git -C workbench push origin \
+		HEAD:refs/for/main/topic \
+		>out-$test_count 2>&1 &&
+	make_user_friendly_and_stable_output <out-$test_count >actual &&
+
+	# Check status report for git-push
+	sed -n \
+		-e "/^To / { p; }" \
+		-e "/^ ! / { p; }" \
+		<actual >actual-report &&
+	cat >expect <<-EOF &&
+	To <URL/of/upstream.git>
+	 ! [remote rejected] HEAD -> refs/for/main/topic (fail to run proc-receive hook)
+	EOF
+	test_cmp expect actual-report &&
+
+	# Check error message from "receive-pack", but ignore unstable fatal error
+	# message ("remote: fatal: the remote end hung up unexpectedly") which
+	# is different from the remote HTTP server with different locale settings.
+	grep "^remote: error:" <actual >actual-error &&
+	format_and_save_expect <<-EOF &&
+	> remote: error: proc-receive version "2" is not supported        Z
+	EOF
+	test_cmp expect actual-error &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/main
+	EOF
+'
+
+test_expect_success "setup proc-receive hook (hook --die-read-version, $PROTOCOL)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-\EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v --die-read-version
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       refs/for/main/topic(A)
+test_expect_success "proc-receive: bad protocol (hook --die-read-version, $PROTOCOL)" '
+	test_must_fail git -C workbench push origin \
+		HEAD:refs/for/main/topic \
+		>out-$test_count 2>&1 &&
+	filter_out_user_friendly_and_stable_output \
+		-e "/^To / { p; }" \
+		-e "/^ ! / { p; }" \
+		<out-$test_count >actual &&
+	cat >expect <<-EOF &&
+	To <URL/of/upstream.git>
+	 ! [remote rejected] HEAD -> refs/for/main/topic (fail to run proc-receive hook)
+	EOF
+	test_cmp expect actual &&
+	grep "remote: fatal: die with the --die-read-version option" out-$test_count &&
+	grep "remote: error: fail to negotiate version with proc-receive hook" out-$test_count &&
+
+	test_cmp_refs -C "$upstream" <<-\EOF
+	<COMMIT-A> refs/heads/main
+	EOF
+'
+
+test_expect_success "setup proc-receive hook (hook --die-write-version, $PROTOCOL)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-\EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v --die-write-version
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       refs/for/main/topic(A)
+test_expect_success "proc-receive: bad protocol (hook --die-write-version, $PROTOCOL)" '
+	test_must_fail git -C workbench push origin \
+		HEAD:refs/for/main/topic \
+		>out-$test_count 2>&1 &&
+	filter_out_user_friendly_and_stable_output \
+		-e "/^To / { p; }" \
+		-e "/^ ! / { p; }" \
+		<out-$test_count >actual &&
+	cat >expect <<-EOF &&
+	To <URL/of/upstream.git>
+	 ! [remote rejected] HEAD -> refs/for/main/topic (fail to run proc-receive hook)
+	EOF
+	test_cmp expect actual &&
+	grep "remote: fatal: die with the --die-write-version option" out-$test_count &&
+	grep "remote: error: fail to negotiate version with proc-receive hook" out-$test_count &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/main
+	EOF
+'
+
+test_expect_success "setup proc-receive hook (hook --die-read-commands, $PROTOCOL)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-\EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v --die-read-commands
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       refs/for/main/topic(A)
+test_expect_success "proc-receive: bad protocol (hook --die-read-commands, $PROTOCOL)" '
+	test_must_fail git -C workbench push origin \
+		HEAD:refs/for/main/topic \
+		>out-$test_count 2>&1 &&
+	filter_out_user_friendly_and_stable_output \
+		-e "/^To / { p; }" \
+		-e "/^ ! / { p; }" \
+		<out-$test_count >actual &&
+	cat >expect <<-EOF &&
+	To <URL/of/upstream.git>
+	 ! [remote rejected] HEAD -> refs/for/main/topic (fail to run proc-receive hook)
+	EOF
+	test_cmp expect actual &&
+	grep "remote: fatal: die with the --die-read-commands option" out-$test_count &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/main
+	EOF
+'
+
+test_expect_success "setup proc-receive hook (hook --die-read-push-options, $PROTOCOL)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-\EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v --die-read-push-options
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       refs/for/main/topic(A)
+test_expect_success "proc-receive: bad protocol (hook --die-read-push-options, $PROTOCOL)" '
+	git -C "$upstream" config receive.advertisePushOptions true &&
+	test_must_fail git -C workbench push origin \
+		-o reviewers=user1,user2 \
+		HEAD:refs/for/main/topic \
+		>out-$test_count 2>&1 &&
+	filter_out_user_friendly_and_stable_output \
+		-e "/^To / { p; }" \
+		-e "/^ ! / { p; }" \
+		<out-$test_count >actual &&
+	cat >expect <<-EOF &&
+	To <URL/of/upstream.git>
+	 ! [remote rejected] HEAD -> refs/for/main/topic (fail to run proc-receive hook)
+	EOF
+	test_cmp expect actual &&
+	grep "remote: fatal: die with the --die-read-push-options option" out-$test_count &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/main
+	EOF
+'
+
+test_expect_success "setup proc-receive hook (hook --die-write-report, $PROTOCOL)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-\EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v --die-write-report
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       refs/for/main/topic(A)
+test_expect_success "proc-receive: bad protocol (hook --die-write-report, $PROTOCOL)" '
+	test_must_fail git -C workbench push origin \
+		HEAD:refs/for/main/topic \
+		>out-$test_count 2>&1 &&
+	filter_out_user_friendly_and_stable_output \
+		-e "/^To / { p; }" \
+		-e "/^ ! / { p; }" \
+		<out-$test_count >actual &&
+	cat >expect <<-EOF &&
+	To <URL/of/upstream.git>
+	 ! [remote rejected] HEAD -> refs/for/main/topic (fail to run proc-receive hook)
+	EOF
+	test_cmp expect actual &&
+	grep "remote: fatal: die with the --die-write-report option" out-$test_count &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/main
+	EOF
+'
+
+test_expect_success "setup proc-receive hook (no report, $PROTOCOL)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-\EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       next(A)  refs/for/main/topic(A)
+test_expect_success "proc-receive: bad protocol (no report, $PROTOCOL)" '
+	test_must_fail git -C workbench push origin \
+		HEAD:refs/heads/next \
+		HEAD:refs/for/main/topic >out-$test_count 2>&1 &&
+	make_user_friendly_and_stable_output <out-$test_count >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/heads/next        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: # post-receive hook        Z
+	> remote: post-receive< <ZERO-OID> <COMMIT-A> refs/heads/next        Z
+	> To <URL/of/upstream.git>
+	>  * [new branch]      HEAD -> next
+	>  ! [remote rejected] HEAD -> refs/for/main/topic (proc-receive failed to report status)
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/main
+	<COMMIT-A> refs/heads/next
+	EOF
+'
+
+# Refs of upstream : main(A)             next(A)
+# Refs of workbench: main(A)  tags/v123
+test_expect_success "cleanup ($PROTOCOL)" '
+	git -C "$upstream" update-ref -d refs/heads/next
+
+'
+
+test_expect_success "setup proc-receive hook (no ref, $PROTOCOL)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-\EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok"
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       refs/for/main/topic
+test_expect_success "proc-receive: bad protocol (no ref, $PROTOCOL)" '
+	test_must_fail git -C workbench push origin \
+		HEAD:refs/for/main/topic\
+		>out-$test_count 2>&1 &&
+	make_user_friendly_and_stable_output <out-$test_count >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: proc-receive> ok        Z
+	> remote: error: proc-receive reported incomplete status line: "ok"        Z
+	> To <URL/of/upstream.git>
+	>  ! [remote rejected] HEAD -> refs/for/main/topic (proc-receive failed to report status)
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/main
+	EOF
+'
+
+test_expect_success "setup proc-receive hook (unknown status, $PROTOCOL)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-\EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "xx refs/for/main/topic"
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       refs/for/main/topic
+test_expect_success "proc-receive: bad protocol (unknown status, $PROTOCOL)" '
+	test_must_fail git -C workbench push origin \
+			HEAD:refs/for/main/topic \
+			>out-$test_count 2>&1 &&
+	make_user_friendly_and_stable_output <out-$test_count >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: proc-receive> xx refs/for/main/topic        Z
+	> remote: error: proc-receive reported bad status "xx" on ref "refs/for/main/topic"        Z
+	> To <URL/of/upstream.git>
+	>  ! [remote rejected] HEAD -> refs/for/main/topic (proc-receive failed to report status)
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/main
+	EOF
+'
diff --git a/t/t5411/test-0014-bad-protocol--porcelain.sh b/t/t5411/test-0014-bad-protocol--porcelain.sh
new file mode 100644
index 0000000..298a3d1
--- /dev/null
+++ b/t/t5411/test-0014-bad-protocol--porcelain.sh
@@ -0,0 +1,304 @@
+test_expect_success "setup proc-receive hook (unknown version, $PROTOCOL/porcelain)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-\EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v --version 2
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       refs/for/main/topic(A)
+test_expect_success "proc-receive: bad protocol (unknown version, $PROTOCOL/porcelain)" '
+	test_must_fail git -C workbench push --porcelain origin \
+		HEAD:refs/for/main/topic \
+		>out-$test_count 2>&1 &&
+	make_user_friendly_and_stable_output <out-$test_count >actual &&
+
+	# Check status report for git-push
+	sed -n \
+		-e "/^To / { p; n; p; n; p; }" \
+		<actual >actual-report &&
+	cat >expect <<-EOF &&
+	To <URL/of/upstream.git>
+	!	HEAD:refs/for/main/topic	[remote rejected] (fail to run proc-receive hook)
+	Done
+	EOF
+	test_cmp expect actual-report &&
+
+	# Check error message from "receive-pack", but ignore unstable fatal error
+	# message ("remote: fatal: the remote end hung up unexpectedly") which
+	# is different from the remote HTTP server with different locale settings.
+	grep "^remote: error:" <actual >actual-error &&
+	format_and_save_expect <<-EOF &&
+	> remote: error: proc-receive version "2" is not supported        Z
+	EOF
+	test_cmp expect actual-error &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/main
+	EOF
+'
+
+test_expect_success "setup proc-receive hook (hook --die-read-version, $PROTOCOL/porcelain)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v --die-read-version
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       refs/for/main/topic(A)
+test_expect_success "proc-receive: bad protocol (hook --die-read-version, $PROTOCOL/porcelain)" '
+	test_must_fail git -C workbench push --porcelain origin \
+		HEAD:refs/for/main/topic \
+		>out-$test_count 2>&1 &&
+	filter_out_user_friendly_and_stable_output \
+		-e "/^To / { p; n; p; n; p; }" \
+		<out-$test_count >actual &&
+	cat >expect <<-EOF &&
+	To <URL/of/upstream.git>
+	!	HEAD:refs/for/main/topic	[remote rejected] (fail to run proc-receive hook)
+	Done
+	EOF
+	test_cmp expect actual &&
+	grep "remote: fatal: die with the --die-read-version option" out-$test_count &&
+	grep "remote: error: fail to negotiate version with proc-receive hook" out-$test_count &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/main
+	EOF
+'
+
+test_expect_success "setup proc-receive hook (hook --die-write-version, $PROTOCOL/porcelain)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-\EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v --die-write-version
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       refs/for/main/topic(A)
+test_expect_success "proc-receive: bad protocol (hook --die-write-version, $PROTOCOL/porcelain)" '
+	test_must_fail git -C workbench push --porcelain origin \
+		HEAD:refs/for/main/topic \
+		>out-$test_count 2>&1 &&
+	filter_out_user_friendly_and_stable_output \
+		-e "/^To / { p; n; p; n; p; }" \
+		<out-$test_count >actual &&
+	cat >expect <<-EOF &&
+	To <URL/of/upstream.git>
+	!	HEAD:refs/for/main/topic	[remote rejected] (fail to run proc-receive hook)
+	Done
+	EOF
+	test_cmp expect actual &&
+	grep "remote: fatal: die with the --die-write-version option" out-$test_count &&
+	grep "remote: error: fail to negotiate version with proc-receive hook" out-$test_count &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/main
+	EOF
+'
+
+test_expect_success "setup proc-receive hook (hook --die-read-commands, $PROTOCOL/porcelain)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-\EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v --die-read-commands
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       refs/for/main/topic(A)
+test_expect_success "proc-receive: bad protocol (hook --die-read-commands, $PROTOCOL/porcelain)" '
+	test_must_fail git -C workbench push --porcelain origin \
+		HEAD:refs/for/main/topic \
+		>out-$test_count 2>&1 &&
+	filter_out_user_friendly_and_stable_output \
+		-e "/^To / { p; n; p; n; p; }" \
+		<out-$test_count >actual &&
+	cat >expect <<-EOF &&
+	To <URL/of/upstream.git>
+	!	HEAD:refs/for/main/topic	[remote rejected] (fail to run proc-receive hook)
+	Done
+	EOF
+	test_cmp expect actual &&
+	grep "remote: fatal: die with the --die-read-commands option" out-$test_count &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/main
+	EOF
+'
+
+test_expect_success "setup proc-receive hook (hook --die-read-push-options, $PROTOCOL/porcelain)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-\EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v --die-read-push-options
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       refs/for/main/topic(A)
+test_expect_success "proc-receive: bad protocol (hook --die-read-push-options, $PROTOCOL/porcelain)" '
+	git -C "$upstream" config receive.advertisePushOptions true &&
+	test_must_fail git -C workbench push --porcelain origin \
+		-o reviewers=user1,user2 \
+		HEAD:refs/for/main/topic \
+		>out-$test_count 2>&1 &&
+	filter_out_user_friendly_and_stable_output \
+		-e "/^To / { p; n; p; n; p; }" \
+		<out-$test_count >actual &&
+	cat >expect <<-EOF &&
+	To <URL/of/upstream.git>
+	!	HEAD:refs/for/main/topic	[remote rejected] (fail to run proc-receive hook)
+	Done
+	EOF
+	test_cmp expect actual &&
+	grep "remote: fatal: die with the --die-read-push-options option" out-$test_count &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/main
+	EOF
+'
+
+test_expect_success "setup proc-receive hook (hook --die-write-report, $PROTOCOL/porcelain)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-\EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v --die-write-report
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       refs/for/main/topic(A)
+test_expect_success "proc-receive: bad protocol (hook --die-write-report, $PROTOCOL/porcelain)" '
+	test_must_fail git -C workbench push --porcelain origin \
+		HEAD:refs/for/main/topic \
+		>out-$test_count 2>&1 &&
+	filter_out_user_friendly_and_stable_output \
+		-e "/^To / { p; n; p; n; p; }" \
+		<out-$test_count >actual &&
+	cat >expect <<-EOF &&
+	To <URL/of/upstream.git>
+	!	HEAD:refs/for/main/topic	[remote rejected] (fail to run proc-receive hook)
+	Done
+	EOF
+	test_cmp expect actual &&
+	grep "remote: fatal: die with the --die-write-report option" out-$test_count &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/main
+	EOF
+'
+
+test_expect_success "setup proc-receive hook (no report, $PROTOCOL/porcelain)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-\EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       next(A)  refs/for/main/topic(A)
+test_expect_success "proc-receive: bad protocol (no report, $PROTOCOL/porcelain)" '
+	test_must_fail git -C workbench push --porcelain origin \
+		HEAD:refs/heads/next \
+		HEAD:refs/for/main/topic >out-$test_count 2>&1 &&
+	make_user_friendly_and_stable_output <out-$test_count >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/heads/next        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: # post-receive hook        Z
+	> remote: post-receive< <ZERO-OID> <COMMIT-A> refs/heads/next        Z
+	> To <URL/of/upstream.git>
+	> *	HEAD:refs/heads/next	[new branch]
+	> !	HEAD:refs/for/main/topic	[remote rejected] (proc-receive failed to report status)
+	> Done
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/main
+	<COMMIT-A> refs/heads/next
+	EOF
+'
+
+# Refs of upstream : main(A)             next(A)
+# Refs of workbench: main(A)  tags/v123
+test_expect_success "cleanup ($PROTOCOL/porcelain)" '
+	git -C "$upstream" update-ref -d refs/heads/next
+'
+
+test_expect_success "setup proc-receive hook (no ref, $PROTOCOL/porcelain)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-\EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok"
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       refs/for/main/topic
+test_expect_success "proc-receive: bad protocol (no ref, $PROTOCOL/porcelain)" '
+	test_must_fail git -C workbench push --porcelain origin \
+		HEAD:refs/for/main/topic\
+		>out-$test_count 2>&1 &&
+	make_user_friendly_and_stable_output <out-$test_count >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: proc-receive> ok        Z
+	> remote: error: proc-receive reported incomplete status line: "ok"        Z
+	> To <URL/of/upstream.git>
+	> !	HEAD:refs/for/main/topic	[remote rejected] (proc-receive failed to report status)
+	> Done
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/main
+	EOF
+'
+
+test_expect_success "setup proc-receive hook (unknown status, $PROTOCOL/porcelain)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-\EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "xx refs/for/main/topic"
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       refs/for/main/topic
+test_expect_success "proc-receive: bad protocol (unknown status, $PROTOCOL/porcelain)" '
+	test_must_fail git -C workbench push --porcelain origin \
+			HEAD:refs/for/main/topic \
+			>out-$test_count 2>&1 &&
+	make_user_friendly_and_stable_output <out-$test_count >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: proc-receive> xx refs/for/main/topic        Z
+	> remote: error: proc-receive reported bad status "xx" on ref "refs/for/main/topic"        Z
+	> To <URL/of/upstream.git>
+	> !	HEAD:refs/for/main/topic	[remote rejected] (proc-receive failed to report status)
+	> Done
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/main
+	EOF
+'
diff --git a/t/t5411/test-0020-report-ng.sh b/t/t5411/test-0020-report-ng.sh
new file mode 100644
index 0000000..6347c96
--- /dev/null
+++ b/t/t5411/test-0020-report-ng.sh
@@ -0,0 +1,63 @@
+test_expect_success "setup proc-receive hook (ng, no message, $PROTOCOL)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-\EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ng refs/for/main/topic"
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       refs/for/main/topic
+test_expect_success "proc-receive: fail to update (ng, no message, $PROTOCOL)" '
+	test_must_fail git -C workbench push origin \
+		HEAD:refs/for/main/topic \
+		>out-$test_count 2>&1 &&
+	make_user_friendly_and_stable_output <out-$test_count >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: proc-receive> ng refs/for/main/topic        Z
+	> To <URL/of/upstream.git>
+	>  ! [remote rejected] HEAD -> refs/for/main/topic (failed)
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/main
+	EOF
+'
+
+test_expect_success "setup proc-receive hook (ng message, $PROTOCOL)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-\EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ng refs/for/main/topic error msg"
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       refs/for/main/topic
+test_expect_success "proc-receive: fail to update (ng, with message, $PROTOCOL)" '
+	test_must_fail git -C workbench push origin \
+		HEAD:refs/for/main/topic \
+		>out-$test_count 2>&1 &&
+	make_user_friendly_and_stable_output <out-$test_count >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: proc-receive> ng refs/for/main/topic error msg        Z
+	> To <URL/of/upstream.git>
+	>  ! [remote rejected] HEAD -> refs/for/main/topic (error msg)
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/main
+	EOF
+'
diff --git a/t/t5411/test-0021-report-ng--porcelain.sh b/t/t5411/test-0021-report-ng--porcelain.sh
new file mode 100644
index 0000000..502b34f
--- /dev/null
+++ b/t/t5411/test-0021-report-ng--porcelain.sh
@@ -0,0 +1,65 @@
+test_expect_success "setup proc-receive hook (ng, no message, $PROTOCOL/porcelain)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-\EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ng refs/for/main/topic"
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       refs/for/main/topic
+test_expect_success "proc-receive: fail to update (ng, no message, $PROTOCOL/porcelain)" '
+	test_must_fail git -C workbench push --porcelain origin \
+		HEAD:refs/for/main/topic \
+		>out-$test_count 2>&1 &&
+	make_user_friendly_and_stable_output <out-$test_count >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: proc-receive> ng refs/for/main/topic        Z
+	> To <URL/of/upstream.git>
+	> !	HEAD:refs/for/main/topic	[remote rejected] (failed)
+	> Done
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/main
+	EOF
+'
+
+test_expect_success "setup proc-receive hook (ng message, $PROTOCOL/porcelain)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-\EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ng refs/for/main/topic error msg"
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       refs/for/main/topic
+test_expect_success "proc-receive: fail to update (ng, with message, $PROTOCOL/porcelain)" '
+	test_must_fail git -C workbench push --porcelain origin \
+		HEAD:refs/for/main/topic \
+		>out-$test_count 2>&1 &&
+	make_user_friendly_and_stable_output <out-$test_count >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: proc-receive> ng refs/for/main/topic error msg        Z
+	> To <URL/of/upstream.git>
+	> !	HEAD:refs/for/main/topic	[remote rejected] (error msg)
+	> Done
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/main
+	EOF
+'
diff --git a/t/t5411/test-0022-report-unexpect-ref.sh b/t/t5411/test-0022-report-unexpect-ref.sh
new file mode 100644
index 0000000..7744392
--- /dev/null
+++ b/t/t5411/test-0022-report-unexpect-ref.sh
@@ -0,0 +1,43 @@
+test_expect_success "setup proc-receive hook (unexpected ref, $PROTOCOL)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-\EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/heads/main"
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         : (B)                   refs/for/main/topic
+test_expect_success "proc-receive: report unexpected ref ($PROTOCOL)" '
+	test_must_fail git -C workbench push origin \
+		$B:refs/heads/main \
+		HEAD:refs/for/main/topic \
+		>out-$test_count 2>&1 &&
+	make_user_friendly_and_stable_output <out-$test_count >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <COMMIT-A> <COMMIT-B> refs/heads/main        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: proc-receive> ok refs/heads/main        Z
+	> remote: error: proc-receive reported status on unexpected ref: refs/heads/main        Z
+	> remote: # post-receive hook        Z
+	> remote: post-receive< <COMMIT-A> <COMMIT-B> refs/heads/main        Z
+	> To <URL/of/upstream.git>
+	>    <COMMIT-A>..<COMMIT-B>  <COMMIT-B> -> main
+	>  ! [remote rejected] HEAD -> refs/for/main/topic (proc-receive failed to report status)
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-B> refs/heads/main
+	EOF
+'
+
+# Refs of upstream : main(B)
+# Refs of workbench: main(A)  tags/v123
+test_expect_success "cleanup ($PROTOCOL)" '
+	git -C "$upstream" update-ref refs/heads/main $A
+'
diff --git a/t/t5411/test-0023-report-unexpect-ref--porcelain.sh b/t/t5411/test-0023-report-unexpect-ref--porcelain.sh
new file mode 100644
index 0000000..6d116ef
--- /dev/null
+++ b/t/t5411/test-0023-report-unexpect-ref--porcelain.sh
@@ -0,0 +1,44 @@
+test_expect_success "setup proc-receive hook (unexpected ref, $PROTOCOL/porcelain)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-\EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/heads/main"
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         : (B)                   refs/for/main/topic
+test_expect_success "proc-receive: report unexpected ref ($PROTOCOL/porcelain)" '
+	test_must_fail git -C workbench push --porcelain origin \
+		$B:refs/heads/main \
+		HEAD:refs/for/main/topic \
+		>out-$test_count 2>&1 &&
+	make_user_friendly_and_stable_output <out-$test_count >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <COMMIT-A> <COMMIT-B> refs/heads/main        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: proc-receive> ok refs/heads/main        Z
+	> remote: error: proc-receive reported status on unexpected ref: refs/heads/main        Z
+	> remote: # post-receive hook        Z
+	> remote: post-receive< <COMMIT-A> <COMMIT-B> refs/heads/main        Z
+	> To <URL/of/upstream.git>
+	>  	<COMMIT-B>:refs/heads/main	<COMMIT-A>..<COMMIT-B>
+	> !	HEAD:refs/for/main/topic	[remote rejected] (proc-receive failed to report status)
+	> Done
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-B> refs/heads/main
+	EOF
+'
+
+# Refs of upstream : main(B)
+# Refs of workbench: main(A)  tags/v123
+test_expect_success "cleanup ($PROTOCOL/porcelain)" '
+	git -C "$upstream" update-ref refs/heads/main $A
+'
diff --git a/t/t5411/test-0024-report-unknown-ref.sh b/t/t5411/test-0024-report-unknown-ref.sh
new file mode 100644
index 0000000..619ca2f
--- /dev/null
+++ b/t/t5411/test-0024-report-unknown-ref.sh
@@ -0,0 +1,32 @@
+test_expect_success "setup proc-receive hook (unexpected ref, $PROTOCOL)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-\EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/main/topic"
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       refs/for/a/b/c/my/topic
+test_expect_success "proc-receive: report unknown reference ($PROTOCOL)" '
+	test_must_fail git -C workbench push origin \
+		HEAD:refs/for/a/b/c/my/topic \
+		>out-$test_count 2>&1 &&
+	make_user_friendly_and_stable_output <out-$test_count >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/a/b/c/my/topic        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/a/b/c/my/topic        Z
+	> remote: proc-receive> ok refs/for/main/topic        Z
+	> remote: error: proc-receive reported status on unknown ref: refs/for/main/topic        Z
+	> To <URL/of/upstream.git>
+	>  ! [remote rejected] HEAD -> refs/for/a/b/c/my/topic (proc-receive failed to report status)
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/main
+	EOF
+'
diff --git a/t/t5411/test-0025-report-unknown-ref--porcelain.sh b/t/t5411/test-0025-report-unknown-ref--porcelain.sh
new file mode 100644
index 0000000..8b3f5d0
--- /dev/null
+++ b/t/t5411/test-0025-report-unknown-ref--porcelain.sh
@@ -0,0 +1,33 @@
+test_expect_success "setup proc-receive hook (unexpected ref, $PROTOCOL/porcelain)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-\EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/main/topic"
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       refs/for/a/b/c/my/topic
+test_expect_success "proc-receive: report unknown reference ($PROTOCOL/porcelain)" '
+	test_must_fail git -C workbench push --porcelain origin \
+		HEAD:refs/for/a/b/c/my/topic \
+		>out-$test_count 2>&1 &&
+	make_user_friendly_and_stable_output <out-$test_count >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/a/b/c/my/topic        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/a/b/c/my/topic        Z
+	> remote: proc-receive> ok refs/for/main/topic        Z
+	> remote: error: proc-receive reported status on unknown ref: refs/for/main/topic        Z
+	> To <URL/of/upstream.git>
+	> !	HEAD:refs/for/a/b/c/my/topic	[remote rejected] (proc-receive failed to report status)
+	> Done
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/main
+	EOF
+'
diff --git a/t/t5411/test-0026-push-options.sh b/t/t5411/test-0026-push-options.sh
new file mode 100644
index 0000000..510fff3
--- /dev/null
+++ b/t/t5411/test-0026-push-options.sh
@@ -0,0 +1,133 @@
+test_expect_success "setup proc-receive hook and disable push-options ($PROTOCOL)" '
+	git -C "$upstream" config receive.advertisePushOptions false &&
+	test_hook -C "$upstream" --clobber proc-receive <<-\EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/main/topic"
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push -o ...  :                       refs/for/main/topic
+test_expect_success "proc-receive: not support push options ($PROTOCOL)" '
+	test_must_fail git -C workbench push \
+		-o issue=123 \
+		-o reviewer=user1 \
+		origin \
+		HEAD:refs/for/main/topic \
+		>out-$test_count 2>&1 &&
+	make_user_friendly_and_stable_output <out-$test_count >actual &&
+	test_grep "fatal: the receiving end does not support push options" \
+		actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/main
+	EOF
+'
+
+test_expect_success "enable push options ($PROTOCOL)" '
+	git -C "$upstream" config receive.advertisePushOptions true
+'
+
+test_expect_success "setup version=0 for proc-receive hook ($PROTOCOL)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-\EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		--version 0 \
+		-r "ok refs/for/main/topic"
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push -o ...  :                       next(A)  refs/for/main/topic
+test_expect_success "proc-receive: ignore push-options for version 0 ($PROTOCOL)" '
+	git -C workbench push \
+		--atomic \
+		-o issue=123 \
+		-o reviewer=user1 \
+		origin \
+		HEAD:refs/heads/next \
+		HEAD:refs/for/main/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/heads/next        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: proc-receive> ok refs/for/main/topic        Z
+	> remote: # post-receive hook        Z
+	> remote: post-receive< <ZERO-OID> <COMMIT-A> refs/heads/next        Z
+	> remote: post-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> To <URL/of/upstream.git>
+	>  * [new branch]      HEAD -> next
+	>  * [new reference]   HEAD -> refs/for/main/topic
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/main
+	<COMMIT-A> refs/heads/next
+	EOF
+'
+
+test_expect_success "restore proc-receive hook ($PROTOCOL)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-\EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/main/topic"
+	EOF
+'
+
+# Refs of upstream : main(A)             next(A)
+# Refs of workbench: main(A)  tags/v123
+test_expect_success "cleanup ($PROTOCOL)" '
+	git -C "$upstream" update-ref -d refs/heads/next
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push -o ...  :                       next(A)  refs/for/main/topic
+test_expect_success "proc-receive: push with options ($PROTOCOL)" '
+	git -C workbench push \
+		--atomic \
+		-o issue=123 \
+		-o reviewer=user1 \
+		origin \
+		HEAD:refs/heads/next \
+		HEAD:refs/for/main/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/heads/next        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive: atomic push_options        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: proc-receive< issue=123        Z
+	> remote: proc-receive< reviewer=user1        Z
+	> remote: proc-receive> ok refs/for/main/topic        Z
+	> remote: # post-receive hook        Z
+	> remote: post-receive< <ZERO-OID> <COMMIT-A> refs/heads/next        Z
+	> remote: post-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> To <URL/of/upstream.git>
+	>  * [new branch]      HEAD -> next
+	>  * [new reference]   HEAD -> refs/for/main/topic
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/main
+	<COMMIT-A> refs/heads/next
+	EOF
+'
+
+# Refs of upstream : main(A)             next(A)
+# Refs of workbench: main(A)  tags/v123
+test_expect_success "cleanup ($PROTOCOL)" '
+	git -C "$upstream" update-ref -d refs/heads/next
+'
diff --git a/t/t5411/test-0027-push-options--porcelain.sh b/t/t5411/test-0027-push-options--porcelain.sh
new file mode 100644
index 0000000..9435457
--- /dev/null
+++ b/t/t5411/test-0027-push-options--porcelain.sh
@@ -0,0 +1,138 @@
+test_expect_success "setup proc-receive hook and disable push-options ($PROTOCOL/porcelain)" '
+	git -C "$upstream" config receive.advertisePushOptions false &&
+	test_hook -C "$upstream" --clobber proc-receive <<-\EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/main/topic"
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push -o ...  :                       refs/for/main/topic
+test_expect_success "proc-receive: not support push options ($PROTOCOL/porcelain)" '
+	test_must_fail git -C workbench push \
+		--porcelain \
+		-o issue=123 \
+		-o reviewer=user1 \
+		origin \
+		HEAD:refs/for/main/topic \
+		>out-$test_count 2>&1 &&
+	make_user_friendly_and_stable_output <out-$test_count >actual &&
+	test_grep "fatal: the receiving end does not support push options" \
+		actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/main
+	EOF
+'
+
+test_expect_success "enable push options ($PROTOCOL/porcelain)" '
+	git -C "$upstream" config receive.advertisePushOptions true
+'
+
+test_expect_success "setup version=0 for proc-receive hook ($PROTOCOL/porcelain)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-\EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		--version 0 \
+		-r "ok refs/for/main/topic"
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push -o ...  :                       next(A)  refs/for/main/topic
+test_expect_success "proc-receive: ignore push-options for version 0 ($PROTOCOL/porcelain)" '
+	git -C workbench push \
+		--porcelain \
+		--atomic \
+		-o issue=123 \
+		-o reviewer=user1 \
+		origin \
+		HEAD:refs/heads/next \
+		HEAD:refs/for/main/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/heads/next        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: proc-receive> ok refs/for/main/topic        Z
+	> remote: # post-receive hook        Z
+	> remote: post-receive< <ZERO-OID> <COMMIT-A> refs/heads/next        Z
+	> remote: post-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> To <URL/of/upstream.git>
+	> *	HEAD:refs/heads/next	[new branch]
+	> *	HEAD:refs/for/main/topic	[new reference]
+	> Done
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/main
+	<COMMIT-A> refs/heads/next
+	EOF
+'
+
+test_expect_success "restore proc-receive hook ($PROTOCOL/porcelain)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-\EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/main/topic"
+	EOF
+'
+
+# Refs of upstream : main(A)             next(A)
+# Refs of workbench: main(A)  tags/v123
+test_expect_success "cleanup ($PROTOCOL/porcelain)" '
+	git -C "$upstream" update-ref -d refs/heads/next
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push -o ...  :                       next(A)  refs/for/main/topic
+test_expect_success "proc-receive: push with options ($PROTOCOL/porcelain)" '
+	git -C workbench push \
+		--porcelain \
+		--atomic \
+		-o issue=123 \
+		-o reviewer=user1 \
+		origin \
+		HEAD:refs/heads/next \
+		HEAD:refs/for/main/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/heads/next        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive: atomic push_options        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: proc-receive< issue=123        Z
+	> remote: proc-receive< reviewer=user1        Z
+	> remote: proc-receive> ok refs/for/main/topic        Z
+	> remote: # post-receive hook        Z
+	> remote: post-receive< <ZERO-OID> <COMMIT-A> refs/heads/next        Z
+	> remote: post-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> To <URL/of/upstream.git>
+	> *	HEAD:refs/heads/next	[new branch]
+	> *	HEAD:refs/for/main/topic	[new reference]
+	> Done
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/main
+	<COMMIT-A> refs/heads/next
+	EOF
+'
+
+# Refs of upstream : main(A)             next(A)
+# Refs of workbench: main(A)  tags/v123
+test_expect_success "cleanup ($PROTOCOL/porcelain)" '
+	git -C "$upstream" update-ref -d refs/heads/next
+'
diff --git a/t/t5411/test-0030-report-ok.sh b/t/t5411/test-0030-report-ok.sh
new file mode 100644
index 0000000..0f190a6
--- /dev/null
+++ b/t/t5411/test-0030-report-ok.sh
@@ -0,0 +1,33 @@
+test_expect_success "setup proc-receive hook (ok, $PROTOCOL)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-\EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/main/topic"
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       refs/for/main/topic
+test_expect_success "proc-receive: ok ($PROTOCOL)" '
+	git -C workbench push origin \
+		HEAD:refs/for/main/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: proc-receive> ok refs/for/main/topic        Z
+	> remote: # post-receive hook        Z
+	> remote: post-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> To <URL/of/upstream.git>
+	>  * [new reference]   HEAD -> refs/for/main/topic
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/main
+	EOF
+'
diff --git a/t/t5411/test-0031-report-ok--porcelain.sh b/t/t5411/test-0031-report-ok--porcelain.sh
new file mode 100644
index 0000000..7ec3981
--- /dev/null
+++ b/t/t5411/test-0031-report-ok--porcelain.sh
@@ -0,0 +1,34 @@
+test_expect_success "setup proc-receive hook (ok, $PROTOCOL/porcelain)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-\EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/main/topic"
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       refs/for/main/topic
+test_expect_success "proc-receive: ok ($PROTOCOL/porcelain)" '
+	git -C workbench push --porcelain origin \
+		HEAD:refs/for/main/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: proc-receive> ok refs/for/main/topic        Z
+	> remote: # post-receive hook        Z
+	> remote: post-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> To <URL/of/upstream.git>
+	> *	HEAD:refs/for/main/topic	[new reference]
+	> Done
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/main
+	EOF
+'
diff --git a/t/t5411/test-0032-report-with-options.sh b/t/t5411/test-0032-report-with-options.sh
new file mode 100644
index 0000000..07733b9
--- /dev/null
+++ b/t/t5411/test-0032-report-with-options.sh
@@ -0,0 +1,253 @@
+test_expect_success "setup proc-receive hook (option without matching ok, $PROTOCOL)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "option refname refs/pull/123/head" \
+		-r "option old-oid $B"
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       refs/for/next/topic(A)  refs/for/a/b/c/topic(A)  refs/for/main/topic(A)
+test_expect_success "proc-receive: report option without matching ok ($PROTOCOL)" '
+	test_must_fail git -C workbench push origin \
+		HEAD:refs/for/main/topic \
+		>out-$test_count 2>&1 &&
+	make_user_friendly_and_stable_output <out-$test_count >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: proc-receive> option refname refs/pull/123/head        Z
+	> remote: proc-receive> option old-oid <COMMIT-B>        Z
+	> remote: error: proc-receive reported "option" without a matching "ok/ng" directive        Z
+	> To <URL/of/upstream.git>
+	>  ! [remote rejected] HEAD -> refs/for/main/topic (proc-receive failed to report status)
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success "setup proc-receive hook (option refname, $PROTOCOL)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-\EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/main/topic" \
+		-r "option refname refs/pull/123/head"
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       refs/for/next/topic(A)  refs/for/a/b/c/topic(A)  refs/for/main/topic(A)
+test_expect_success "proc-receive: report option refname ($PROTOCOL)" '
+	git -C workbench push origin \
+		HEAD:refs/for/main/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: proc-receive> ok refs/for/main/topic        Z
+	> remote: proc-receive> option refname refs/pull/123/head        Z
+	> remote: # post-receive hook        Z
+	> remote: post-receive< <ZERO-OID> <COMMIT-A> refs/pull/123/head        Z
+	> To <URL/of/upstream.git>
+	>  * [new reference]   HEAD -> refs/pull/123/head
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success "setup proc-receive hook (option refname and forced-update, $PROTOCOL)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-\EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/main/topic" \
+		-r "option refname refs/pull/123/head" \
+		-r "option forced-update"
+	EOF
+'
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       refs/for/next/topic(A)  refs/for/a/b/c/topic(A)  refs/for/main/topic(A)
+test_expect_success "proc-receive: report option refname and forced-update ($PROTOCOL)" '
+	git -C workbench push origin \
+		HEAD:refs/for/main/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: proc-receive> ok refs/for/main/topic        Z
+	> remote: proc-receive> option refname refs/pull/123/head        Z
+	> remote: proc-receive> option forced-update        Z
+	> remote: # post-receive hook        Z
+	> remote: post-receive< <ZERO-OID> <COMMIT-A> refs/pull/123/head        Z
+	> To <URL/of/upstream.git>
+	>  * [new reference]   HEAD -> refs/pull/123/head
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success "setup proc-receive hook (option refname and old-oid, $PROTOCOL)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/main/topic" \
+		-r "option refname refs/pull/123/head" \
+		-r "option old-oid $B"
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       refs/for/next/topic(A)  refs/for/a/b/c/topic(A)  refs/for/main/topic(A)
+test_expect_success "proc-receive: report option refname and old-oid ($PROTOCOL)" '
+	git -C workbench push origin \
+		HEAD:refs/for/main/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: proc-receive> ok refs/for/main/topic        Z
+	> remote: proc-receive> option refname refs/pull/123/head        Z
+	> remote: proc-receive> option old-oid <COMMIT-B>        Z
+	> remote: # post-receive hook        Z
+	> remote: post-receive< <COMMIT-B> <COMMIT-A> refs/pull/123/head        Z
+	> To <URL/of/upstream.git>
+	>    <COMMIT-B>..<COMMIT-A>  HEAD -> refs/pull/123/head
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success "setup proc-receive hook (option old-oid, $PROTOCOL)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/main/topic" \
+		-r "option old-oid $B"
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       refs/for/next/topic(A)  refs/for/a/b/c/topic(A)  refs/for/main/topic(A)
+test_expect_success "proc-receive: report option old-oid ($PROTOCOL)" '
+	git -C workbench push origin \
+		HEAD:refs/for/main/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: proc-receive> ok refs/for/main/topic        Z
+	> remote: proc-receive> option old-oid <COMMIT-B>        Z
+	> remote: # post-receive hook        Z
+	> remote: post-receive< <COMMIT-B> <COMMIT-A> refs/for/main/topic        Z
+	> To <URL/of/upstream.git>
+	>    <COMMIT-B>..<COMMIT-A>  HEAD -> refs/for/main/topic
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success "setup proc-receive hook (option old-oid and new-oid, $PROTOCOL)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/main/topic" \
+		-r "option old-oid $A" \
+		-r "option new-oid $B"
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       refs/for/next/topic(A)  refs/for/a/b/c/topic(A)  refs/for/main/topic(A)
+test_expect_success "proc-receive: report option old-oid and new-oid ($PROTOCOL)" '
+	git -C workbench push origin \
+		HEAD:refs/for/main/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: proc-receive> ok refs/for/main/topic        Z
+	> remote: proc-receive> option old-oid <COMMIT-A>        Z
+	> remote: proc-receive> option new-oid <COMMIT-B>        Z
+	> remote: # post-receive hook        Z
+	> remote: post-receive< <COMMIT-A> <COMMIT-B> refs/for/main/topic        Z
+	> To <URL/of/upstream.git>
+	>    <COMMIT-A>..<COMMIT-B>  HEAD -> refs/for/main/topic
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success "setup proc-receive hook (report with multiple rewrites, $PROTOCOL)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/a/b/c/topic" \
+		-r "ok refs/for/next/topic" \
+		-r "option refname refs/pull/123/head" \
+		-r "ok refs/for/main/topic" \
+		-r "option refname refs/pull/124/head" \
+		-r "option old-oid $B" \
+		-r "option forced-update" \
+		-r "option new-oid $A"
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       refs/for/next/topic(A)  refs/for/a/b/c/topic(A)  refs/for/main/topic(A)
+test_expect_success "proc-receive: report with multiple rewrites ($PROTOCOL)" '
+	git -C workbench push origin \
+		HEAD:refs/for/next/topic \
+		HEAD:refs/for/a/b/c/topic \
+		HEAD:refs/for/main/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/a/b/c/topic        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/a/b/c/topic        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: proc-receive> ok refs/for/a/b/c/topic        Z
+	> remote: proc-receive> ok refs/for/next/topic        Z
+	> remote: proc-receive> option refname refs/pull/123/head        Z
+	> remote: proc-receive> ok refs/for/main/topic        Z
+	> remote: proc-receive> option refname refs/pull/124/head        Z
+	> remote: proc-receive> option old-oid <COMMIT-B>        Z
+	> remote: proc-receive> option forced-update        Z
+	> remote: proc-receive> option new-oid <COMMIT-A>        Z
+	> remote: # post-receive hook        Z
+	> remote: post-receive< <ZERO-OID> <COMMIT-A> refs/pull/123/head        Z
+	> remote: post-receive< <ZERO-OID> <COMMIT-A> refs/for/a/b/c/topic        Z
+	> remote: post-receive< <COMMIT-B> <COMMIT-A> refs/pull/124/head        Z
+	> To <URL/of/upstream.git>
+	>  * [new reference]   HEAD -> refs/pull/123/head
+	>  * [new reference]   HEAD -> refs/for/a/b/c/topic
+	>  + <COMMIT-B>...<COMMIT-A> HEAD -> refs/pull/124/head (forced update)
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/main
+	EOF
+'
diff --git a/t/t5411/test-0033-report-with-options--porcelain.sh b/t/t5411/test-0033-report-with-options--porcelain.sh
new file mode 100644
index 0000000..2e1831b
--- /dev/null
+++ b/t/t5411/test-0033-report-with-options--porcelain.sh
@@ -0,0 +1,262 @@
+test_expect_success "setup proc-receive hook (option without matching ok, $PROTOCOL/porcelain)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "option refname refs/pull/123/head" \
+		-r "option old-oid $B"
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       refs/for/next/topic(A)  refs/for/a/b/c/topic(A)  refs/for/main/topic(A)
+test_expect_success "proc-receive: report option without matching ok ($PROTOCOL/porcelain)" '
+	test_must_fail git -C workbench push --porcelain origin \
+		HEAD:refs/for/main/topic \
+		>out-$test_count 2>&1 &&
+	make_user_friendly_and_stable_output <out-$test_count >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: proc-receive> option refname refs/pull/123/head        Z
+	> remote: proc-receive> option old-oid <COMMIT-B>        Z
+	> remote: error: proc-receive reported "option" without a matching "ok/ng" directive        Z
+	> To <URL/of/upstream.git>
+	> !	HEAD:refs/for/main/topic	[remote rejected] (proc-receive failed to report status)
+	> Done
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success "setup proc-receive hook (option refname, $PROTOCOL/porcelain)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-\EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/main/topic" \
+		-r "option refname refs/pull/123/head"
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       refs/for/next/topic(A)  refs/for/a/b/c/topic(A)  refs/for/main/topic(A)
+test_expect_success "proc-receive: report option refname ($PROTOCOL/porcelain)" '
+	git -C workbench push --porcelain origin \
+		HEAD:refs/for/main/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: proc-receive> ok refs/for/main/topic        Z
+	> remote: proc-receive> option refname refs/pull/123/head        Z
+	> remote: # post-receive hook        Z
+	> remote: post-receive< <ZERO-OID> <COMMIT-A> refs/pull/123/head        Z
+	> To <URL/of/upstream.git>
+	> *	HEAD:refs/pull/123/head	[new reference]
+	> Done
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success "setup proc-receive hook (option refname and forced-update, $PROTOCOL/porcelain)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-\EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/main/topic" \
+		-r "option refname refs/pull/123/head" \
+		-r "option forced-update"
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       refs/for/next/topic(A)  refs/for/a/b/c/topic(A)  refs/for/main/topic(A)
+test_expect_success "proc-receive: report option refname and forced-update ($PROTOCOL/porcelain)" '
+	git -C workbench push --porcelain origin \
+		HEAD:refs/for/main/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: proc-receive> ok refs/for/main/topic        Z
+	> remote: proc-receive> option refname refs/pull/123/head        Z
+	> remote: proc-receive> option forced-update        Z
+	> remote: # post-receive hook        Z
+	> remote: post-receive< <ZERO-OID> <COMMIT-A> refs/pull/123/head        Z
+	> To <URL/of/upstream.git>
+	> *	HEAD:refs/pull/123/head	[new reference]
+	> Done
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success "setup proc-receive hook (option refname and old-oid, $PROTOCOL/porcelain)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/main/topic" \
+		-r "option refname refs/pull/123/head" \
+		-r "option old-oid $B"
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       refs/for/next/topic(A)  refs/for/a/b/c/topic(A)  refs/for/main/topic(A)
+test_expect_success "proc-receive: report option refname and old-oid ($PROTOCOL/porcelain)" '
+	git -C workbench push --porcelain origin \
+		HEAD:refs/for/main/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: proc-receive> ok refs/for/main/topic        Z
+	> remote: proc-receive> option refname refs/pull/123/head        Z
+	> remote: proc-receive> option old-oid <COMMIT-B>        Z
+	> remote: # post-receive hook        Z
+	> remote: post-receive< <COMMIT-B> <COMMIT-A> refs/pull/123/head        Z
+	> To <URL/of/upstream.git>
+	>  	HEAD:refs/pull/123/head	<COMMIT-B>..<COMMIT-A>
+	> Done
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success "setup proc-receive hook (option old-oid, $PROTOCOL/porcelain)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/main/topic" \
+		-r "option old-oid $B"
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       refs/for/next/topic(A)  refs/for/a/b/c/topic(A)  refs/for/main/topic(A)
+test_expect_success "proc-receive: report option old-oid ($PROTOCOL/porcelain)" '
+	git -C workbench push --porcelain origin \
+		HEAD:refs/for/main/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: proc-receive> ok refs/for/main/topic        Z
+	> remote: proc-receive> option old-oid <COMMIT-B>        Z
+	> remote: # post-receive hook        Z
+	> remote: post-receive< <COMMIT-B> <COMMIT-A> refs/for/main/topic        Z
+	> To <URL/of/upstream.git>
+	>  	HEAD:refs/for/main/topic	<COMMIT-B>..<COMMIT-A>
+	> Done
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success "setup proc-receive hook (option old-oid and new-oid, $PROTOCOL/porcelain)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/main/topic" \
+		-r "option old-oid $A" \
+		-r "option new-oid $B"
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       refs/for/next/topic(A)  refs/for/a/b/c/topic(A)  refs/for/main/topic(A)
+test_expect_success "proc-receive: report option old-oid and new-oid ($PROTOCOL/porcelain)" '
+	git -C workbench push --porcelain origin \
+		HEAD:refs/for/main/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: proc-receive> ok refs/for/main/topic        Z
+	> remote: proc-receive> option old-oid <COMMIT-A>        Z
+	> remote: proc-receive> option new-oid <COMMIT-B>        Z
+	> remote: # post-receive hook        Z
+	> remote: post-receive< <COMMIT-A> <COMMIT-B> refs/for/main/topic        Z
+	> To <URL/of/upstream.git>
+	>  	HEAD:refs/for/main/topic	<COMMIT-A>..<COMMIT-B>
+	> Done
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success "setup proc-receive hook (report with multiple rewrites, $PROTOCOL/porcelain)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/a/b/c/topic" \
+		-r "ok refs/for/next/topic" \
+		-r "option refname refs/pull/123/head" \
+		-r "ok refs/for/main/topic" \
+		-r "option refname refs/pull/124/head" \
+		-r "option old-oid $B" \
+		-r "option forced-update" \
+		-r "option new-oid $A"
+
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       refs/for/next/topic(A)  refs/for/a/b/c/topic(A)  refs/for/main/topic(A)
+test_expect_success "proc-receive: report with multiple rewrites ($PROTOCOL/porcelain)" '
+	git -C workbench push --porcelain origin \
+		HEAD:refs/for/next/topic \
+		HEAD:refs/for/a/b/c/topic \
+		HEAD:refs/for/main/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/a/b/c/topic        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/a/b/c/topic        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: proc-receive> ok refs/for/a/b/c/topic        Z
+	> remote: proc-receive> ok refs/for/next/topic        Z
+	> remote: proc-receive> option refname refs/pull/123/head        Z
+	> remote: proc-receive> ok refs/for/main/topic        Z
+	> remote: proc-receive> option refname refs/pull/124/head        Z
+	> remote: proc-receive> option old-oid <COMMIT-B>        Z
+	> remote: proc-receive> option forced-update        Z
+	> remote: proc-receive> option new-oid <COMMIT-A>        Z
+	> remote: # post-receive hook        Z
+	> remote: post-receive< <ZERO-OID> <COMMIT-A> refs/pull/123/head        Z
+	> remote: post-receive< <ZERO-OID> <COMMIT-A> refs/for/a/b/c/topic        Z
+	> remote: post-receive< <COMMIT-B> <COMMIT-A> refs/pull/124/head        Z
+	> To <URL/of/upstream.git>
+	> *	HEAD:refs/pull/123/head	[new reference]
+	> *	HEAD:refs/for/a/b/c/topic	[new reference]
+	> +	HEAD:refs/pull/124/head	<COMMIT-B>...<COMMIT-A> (forced update)
+	> Done
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/main
+	EOF
+'
diff --git a/t/t5411/test-0034-report-ft.sh b/t/t5411/test-0034-report-ft.sh
new file mode 100644
index 0000000..0e37535
--- /dev/null
+++ b/t/t5411/test-0034-report-ft.sh
@@ -0,0 +1,42 @@
+test_expect_success "setup proc-receive hook (ft, $PROTOCOL)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-\EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/main/topic" \
+		-r "option fall-through"
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       refs/for/main/topic(B)
+test_expect_success "proc-receive: fall throught, let receive-pack to execute ($PROTOCOL)" '
+	git -C workbench push origin \
+		$B:refs/for/main/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-B> refs/for/main/topic        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-B> refs/for/main/topic        Z
+	> remote: proc-receive> ok refs/for/main/topic        Z
+	> remote: proc-receive> option fall-through        Z
+	> remote: # post-receive hook        Z
+	> remote: post-receive< <ZERO-OID> <COMMIT-B> refs/for/main/topic        Z
+	> To <URL/of/upstream.git>
+	>  * [new reference]   <COMMIT-B> -> refs/for/main/topic
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-B> refs/for/main/topic
+	<COMMIT-A> refs/heads/main
+	EOF
+'
+
+# Refs of upstream : main(A)             refs/for/main/topic(A)
+# Refs of workbench: main(A)  tags/v123
+test_expect_success "cleanup ($PROTOCOL)" '
+	git -C "$upstream" update-ref -d refs/for/main/topic
+'
diff --git a/t/t5411/test-0035-report-ft--porcelain.sh b/t/t5411/test-0035-report-ft--porcelain.sh
new file mode 100644
index 0000000..b9a0518
--- /dev/null
+++ b/t/t5411/test-0035-report-ft--porcelain.sh
@@ -0,0 +1,43 @@
+test_expect_success "setup proc-receive hook (fall-through, $PROTOCOL/porcelain)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-\EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/main/topic" \
+		-r "option fall-through"
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       refs/for/main/topic(B)
+test_expect_success "proc-receive: fall throught, let receive-pack to execute ($PROTOCOL/porcelain)" '
+	git -C workbench push --porcelain origin \
+		$B:refs/for/main/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-B> refs/for/main/topic        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-B> refs/for/main/topic        Z
+	> remote: proc-receive> ok refs/for/main/topic        Z
+	> remote: proc-receive> option fall-through        Z
+	> remote: # post-receive hook        Z
+	> remote: post-receive< <ZERO-OID> <COMMIT-B> refs/for/main/topic        Z
+	> To <URL/of/upstream.git>
+	> *	<COMMIT-B>:refs/for/main/topic	[new reference]
+	> Done
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-B> refs/for/main/topic
+	<COMMIT-A> refs/heads/main
+	EOF
+'
+
+# Refs of upstream : main(A)             refs/for/main/topic(A)
+# Refs of workbench: main(A)  tags/v123
+test_expect_success "cleanup ($PROTOCOL/porcelain)" '
+	git -C "$upstream" update-ref -d refs/for/main/topic
+'
diff --git a/t/t5411/test-0036-report-multi-rewrite-for-one-ref.sh b/t/t5411/test-0036-report-multi-rewrite-for-one-ref.sh
new file mode 100644
index 0000000..889e970
--- /dev/null
+++ b/t/t5411/test-0036-report-multi-rewrite-for-one-ref.sh
@@ -0,0 +1,221 @@
+test_expect_success "setup git config for remote-tracking of special refs" '
+	(
+		cd workbench &&
+		if ! git config --get-all remote.origin.fetch | grep refs/for/
+		then
+			git config --add remote.origin.fetch \
+				"+refs/for/*:refs/t/for/*" &&
+			git config --add remote.origin.fetch \
+				"+refs/pull/*:refs/t/pull/*" &&
+			git config --add remote.origin.fetch \
+				"+refs/changes/*:refs/t/changes/*"
+		fi
+	)
+'
+
+test_expect_success "setup proc-receive hook (multiple rewrites for one ref, no refname for the 1st rewrite, $PROTOCOL)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/main/topic" \
+		-r "option old-oid $A" \
+		-r "option new-oid $B" \
+		-r "ok refs/for/main/topic" \
+		-r "option refname refs/changes/24/124/1" \
+		-r "option old-oid $ZERO_OID" \
+		-r "option new-oid $A" \
+		-r "ok refs/for/main/topic" \
+		-r "option refname refs/changes/25/125/1" \
+		-r "option old-oid $A" \
+		-r "option new-oid $B"
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       refs/for/main/topic(A)
+test_expect_success "proc-receive: multiple rewrite for one ref, no refname for the 1st rewrite ($PROTOCOL)" '
+	git -C workbench push origin \
+		HEAD:refs/for/main/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: proc-receive> ok refs/for/main/topic        Z
+	> remote: proc-receive> option old-oid <COMMIT-A>        Z
+	> remote: proc-receive> option new-oid <COMMIT-B>        Z
+	> remote: proc-receive> ok refs/for/main/topic        Z
+	> remote: proc-receive> option refname refs/changes/24/124/1        Z
+	> remote: proc-receive> option old-oid <ZERO-OID>        Z
+	> remote: proc-receive> option new-oid <COMMIT-A>        Z
+	> remote: proc-receive> ok refs/for/main/topic        Z
+	> remote: proc-receive> option refname refs/changes/25/125/1        Z
+	> remote: proc-receive> option old-oid <COMMIT-A>        Z
+	> remote: proc-receive> option new-oid <COMMIT-B>        Z
+	> remote: # post-receive hook        Z
+	> remote: post-receive< <COMMIT-A> <COMMIT-B> refs/for/main/topic        Z
+	> remote: post-receive< <ZERO-OID> <COMMIT-A> refs/changes/24/124/1        Z
+	> remote: post-receive< <COMMIT-A> <COMMIT-B> refs/changes/25/125/1        Z
+	> To <URL/of/upstream.git>
+	>    <COMMIT-A>..<COMMIT-B>  HEAD -> refs/for/main/topic
+	>  * [new reference]   HEAD -> refs/changes/24/124/1
+	>    <COMMIT-A>..<COMMIT-B>  HEAD -> refs/changes/25/125/1
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/main
+	EOF
+'
+
+test_expect_success "proc-receive: check remote-tracking #1 ($PROTOCOL)" '
+	git -C workbench show-ref |
+		grep -v -e refs/remotes -e refs/heads -e refs/tags >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/t/changes/24/124/1
+	<COMMIT-B> refs/t/changes/25/125/1
+	<COMMIT-B> refs/t/for/main/topic
+	EOF
+	test_cmp expect actual &&
+	git -C workbench update-ref -d refs/t/for/main/topic &&
+	git -C workbench update-ref -d refs/t/changes/24/124/1 &&
+	git -C workbench update-ref -d refs/t/changes/25/125/1
+'
+
+test_expect_success "setup proc-receive hook (multiple rewrites for one ref, no refname for the 2nd rewrite, $PROTOCOL)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/main/topic" \
+		-r "option refname refs/changes/24/124/1" \
+		-r "option old-oid $ZERO_OID" \
+		-r "option new-oid $A" \
+		-r "ok refs/for/main/topic" \
+		-r "option old-oid $A" \
+		-r "option new-oid $B" \
+		-r "ok refs/for/main/topic" \
+		-r "option refname refs/changes/25/125/1" \
+		-r "option old-oid $B" \
+		-r "option new-oid $A" \
+		-r "option forced-update"
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       refs/for/main/topic(A)
+test_expect_success "proc-receive: multiple rewrites for one ref, no refname for the 2nd rewrite ($PROTOCOL)" '
+	git -C workbench push origin \
+		HEAD:refs/for/main/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: proc-receive> ok refs/for/main/topic        Z
+	> remote: proc-receive> option refname refs/changes/24/124/1        Z
+	> remote: proc-receive> option old-oid <ZERO-OID>        Z
+	> remote: proc-receive> option new-oid <COMMIT-A>        Z
+	> remote: proc-receive> ok refs/for/main/topic        Z
+	> remote: proc-receive> option old-oid <COMMIT-A>        Z
+	> remote: proc-receive> option new-oid <COMMIT-B>        Z
+	> remote: proc-receive> ok refs/for/main/topic        Z
+	> remote: proc-receive> option refname refs/changes/25/125/1        Z
+	> remote: proc-receive> option old-oid <COMMIT-B>        Z
+	> remote: proc-receive> option new-oid <COMMIT-A>        Z
+	> remote: proc-receive> option forced-update        Z
+	> remote: # post-receive hook        Z
+	> remote: post-receive< <ZERO-OID> <COMMIT-A> refs/changes/24/124/1        Z
+	> remote: post-receive< <COMMIT-A> <COMMIT-B> refs/for/main/topic        Z
+	> remote: post-receive< <COMMIT-B> <COMMIT-A> refs/changes/25/125/1        Z
+	> To <URL/of/upstream.git>
+	>  * [new reference]   HEAD -> refs/changes/24/124/1
+	>    <COMMIT-A>..<COMMIT-B>  HEAD -> refs/for/main/topic
+	>  + <COMMIT-B>...<COMMIT-A> HEAD -> refs/changes/25/125/1 (forced update)
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/main
+	EOF
+'
+
+test_expect_success "proc-receive: check remote-tracking #2 ($PROTOCOL)" '
+	git -C workbench show-ref |
+		grep -v -e refs/remotes -e refs/heads -e refs/tags >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/t/changes/24/124/1
+	<COMMIT-A> refs/t/changes/25/125/1
+	<COMMIT-B> refs/t/for/main/topic
+	EOF
+	test_cmp expect actual &&
+	git -C workbench update-ref -d refs/t/for/main/topic &&
+	git -C workbench update-ref -d refs/t/changes/24/124/1 &&
+	git -C workbench update-ref -d refs/t/changes/25/125/1
+'
+
+test_expect_success "setup proc-receive hook (multiple rewrites for one ref, $PROTOCOL)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/main/topic" \
+		-r "option refname refs/changes/23/123/1" \
+		-r "ok refs/for/main/topic" \
+		-r "option refname refs/changes/24/124/2" \
+		-r "option old-oid $A" \
+		-r "option new-oid $B"
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       refs/for/main/topic(A)
+test_expect_success "proc-receive: multiple rewrites for one ref ($PROTOCOL)" '
+	git -C workbench push origin \
+		HEAD:refs/for/main/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: proc-receive> ok refs/for/main/topic        Z
+	> remote: proc-receive> option refname refs/changes/23/123/1        Z
+	> remote: proc-receive> ok refs/for/main/topic        Z
+	> remote: proc-receive> option refname refs/changes/24/124/2        Z
+	> remote: proc-receive> option old-oid <COMMIT-A>        Z
+	> remote: proc-receive> option new-oid <COMMIT-B>        Z
+	> remote: # post-receive hook        Z
+	> remote: post-receive< <ZERO-OID> <COMMIT-A> refs/changes/23/123/1        Z
+	> remote: post-receive< <COMMIT-A> <COMMIT-B> refs/changes/24/124/2        Z
+	> To <URL/of/upstream.git>
+	>  * [new reference]   HEAD -> refs/changes/23/123/1
+	>    <COMMIT-A>..<COMMIT-B>  HEAD -> refs/changes/24/124/2
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/main
+	EOF
+'
+
+test_expect_success "proc-receive: check remote-tracking #3 ($PROTOCOL)" '
+	git -C workbench show-ref |
+		grep -v -e refs/remotes -e refs/heads -e refs/tags >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/t/changes/23/123/1
+	<COMMIT-B> refs/t/changes/24/124/2
+	EOF
+	test_cmp expect actual &&
+	git -C workbench update-ref -d refs/t/changes/24/124/1 &&
+	git -C workbench update-ref -d refs/t/changes/25/125/2
+'
diff --git a/t/t5411/test-0037-report-multi-rewrite-for-one-ref--porcelain.sh b/t/t5411/test-0037-report-multi-rewrite-for-one-ref--porcelain.sh
new file mode 100644
index 0000000..1e523b1
--- /dev/null
+++ b/t/t5411/test-0037-report-multi-rewrite-for-one-ref--porcelain.sh
@@ -0,0 +1,166 @@
+test_expect_success "setup proc-receive hook (multiple rewrites for one ref, no refname for the 1st rewrite, $PROTOCOL/porcelain)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/main/topic" \
+		-r "option old-oid $A" \
+		-r "option new-oid $B" \
+		-r "ok refs/for/main/topic" \
+		-r "option refname refs/changes/24/124/1" \
+		-r "option old-oid $ZERO_OID" \
+		-r "option new-oid $A" \
+		-r "ok refs/for/main/topic" \
+		-r "option refname refs/changes/25/125/1" \
+		-r "option old-oid $A" \
+		-r "option new-oid $B"
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       refs/for/main/topic(A)
+test_expect_success "proc-receive: multiple rewrite for one ref, no refname for the 1st rewrite ($PROTOCOL/porcelain)" '
+	git -C workbench push --porcelain origin \
+		HEAD:refs/for/main/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: proc-receive> ok refs/for/main/topic        Z
+	> remote: proc-receive> option old-oid <COMMIT-A>        Z
+	> remote: proc-receive> option new-oid <COMMIT-B>        Z
+	> remote: proc-receive> ok refs/for/main/topic        Z
+	> remote: proc-receive> option refname refs/changes/24/124/1        Z
+	> remote: proc-receive> option old-oid <ZERO-OID>        Z
+	> remote: proc-receive> option new-oid <COMMIT-A>        Z
+	> remote: proc-receive> ok refs/for/main/topic        Z
+	> remote: proc-receive> option refname refs/changes/25/125/1        Z
+	> remote: proc-receive> option old-oid <COMMIT-A>        Z
+	> remote: proc-receive> option new-oid <COMMIT-B>        Z
+	> remote: # post-receive hook        Z
+	> remote: post-receive< <COMMIT-A> <COMMIT-B> refs/for/main/topic        Z
+	> remote: post-receive< <ZERO-OID> <COMMIT-A> refs/changes/24/124/1        Z
+	> remote: post-receive< <COMMIT-A> <COMMIT-B> refs/changes/25/125/1        Z
+	> To <URL/of/upstream.git>
+	>  	HEAD:refs/for/main/topic	<COMMIT-A>..<COMMIT-B>
+	> *	HEAD:refs/changes/24/124/1	[new reference]
+	>  	HEAD:refs/changes/25/125/1	<COMMIT-A>..<COMMIT-B>
+	> Done
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/main
+	EOF
+'
+
+test_expect_success "setup proc-receive hook (multiple rewrites for one ref, no refname for the 2nd rewrite, $PROTOCOL/porcelain)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/main/topic" \
+		-r "option refname refs/changes/24/124/1" \
+		-r "option old-oid $ZERO_OID" \
+		-r "option new-oid $A" \
+		-r "ok refs/for/main/topic" \
+		-r "option old-oid $A" \
+		-r "option new-oid $B" \
+		-r "ok refs/for/main/topic" \
+		-r "option refname refs/changes/25/125/1" \
+		-r "option old-oid $B" \
+		-r "option new-oid $A" \
+		-r "option forced-update"
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       refs/for/main/topic(A)
+test_expect_success "proc-receive: multiple rewrites for one ref, no refname for the 2nd rewrite ($PROTOCOL/porcelain)" '
+	git -C workbench push --porcelain origin \
+		HEAD:refs/for/main/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: proc-receive> ok refs/for/main/topic        Z
+	> remote: proc-receive> option refname refs/changes/24/124/1        Z
+	> remote: proc-receive> option old-oid <ZERO-OID>        Z
+	> remote: proc-receive> option new-oid <COMMIT-A>        Z
+	> remote: proc-receive> ok refs/for/main/topic        Z
+	> remote: proc-receive> option old-oid <COMMIT-A>        Z
+	> remote: proc-receive> option new-oid <COMMIT-B>        Z
+	> remote: proc-receive> ok refs/for/main/topic        Z
+	> remote: proc-receive> option refname refs/changes/25/125/1        Z
+	> remote: proc-receive> option old-oid <COMMIT-B>        Z
+	> remote: proc-receive> option new-oid <COMMIT-A>        Z
+	> remote: proc-receive> option forced-update        Z
+	> remote: # post-receive hook        Z
+	> remote: post-receive< <ZERO-OID> <COMMIT-A> refs/changes/24/124/1        Z
+	> remote: post-receive< <COMMIT-A> <COMMIT-B> refs/for/main/topic        Z
+	> remote: post-receive< <COMMIT-B> <COMMIT-A> refs/changes/25/125/1        Z
+	> To <URL/of/upstream.git>
+	> *	HEAD:refs/changes/24/124/1	[new reference]
+	>  	HEAD:refs/for/main/topic	<COMMIT-A>..<COMMIT-B>
+	> +	HEAD:refs/changes/25/125/1	<COMMIT-B>...<COMMIT-A> (forced update)
+	> Done
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/main
+	EOF
+'
+
+test_expect_success "setup proc-receive hook (multiple rewrites for one ref, $PROTOCOL/porcelain)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/main/topic" \
+		-r "option refname refs/changes/23/123/1" \
+		-r "ok refs/for/main/topic" \
+		-r "option refname refs/changes/24/124/2" \
+		-r "option old-oid $A" \
+		-r "option new-oid $B"
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         :                       refs/for/main/topic(A)
+test_expect_success "proc-receive: multiple rewrites for one ref ($PROTOCOL/porcelain)" '
+	git -C workbench push --porcelain origin \
+		HEAD:refs/for/main/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: proc-receive> ok refs/for/main/topic        Z
+	> remote: proc-receive> option refname refs/changes/23/123/1        Z
+	> remote: proc-receive> ok refs/for/main/topic        Z
+	> remote: proc-receive> option refname refs/changes/24/124/2        Z
+	> remote: proc-receive> option old-oid <COMMIT-A>        Z
+	> remote: proc-receive> option new-oid <COMMIT-B>        Z
+	> remote: # post-receive hook        Z
+	> remote: post-receive< <ZERO-OID> <COMMIT-A> refs/changes/23/123/1        Z
+	> remote: post-receive< <COMMIT-A> <COMMIT-B> refs/changes/24/124/2        Z
+	> To <URL/of/upstream.git>
+	> *	HEAD:refs/changes/23/123/1	[new reference]
+	>  	HEAD:refs/changes/24/124/2	<COMMIT-A>..<COMMIT-B>
+	> Done
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/main
+	EOF
+'
diff --git a/t/t5411/test-0038-report-mixed-refs.sh b/t/t5411/test-0038-report-mixed-refs.sh
new file mode 100644
index 0000000..4c70e84
--- /dev/null
+++ b/t/t5411/test-0038-report-mixed-refs.sh
@@ -0,0 +1,87 @@
+test_expect_success "setup proc-receive hook ($PROTOCOL)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/next/topic2" \
+		-r "ng refs/for/next/topic1 fail to call Web API" \
+		-r "ok refs/for/main/topic" \
+		-r "option refname refs/for/main/topic" \
+		-r "option old-oid $A" \
+		-r "option new-oid $B"
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         : (B)                   bar(A)  baz(A)  refs/for/next/topic(A)  foo(A)  refs/for/main/topic(A)
+test_expect_success "proc-receive: report update of mixed refs ($PROTOCOL)" '
+	test_must_fail git -C workbench push origin \
+		$B:refs/heads/main \
+		HEAD:refs/heads/bar \
+		HEAD:refs/heads/baz \
+		HEAD:refs/for/next/topic2 \
+		HEAD:refs/for/next/topic1 \
+		HEAD:refs/heads/foo \
+		HEAD:refs/for/main/topic \
+		HEAD:refs/for/next/topic3 \
+		>out-$test_count 2>&1 &&
+	make_user_friendly_and_stable_output <out-$test_count >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <COMMIT-A> <COMMIT-B> refs/heads/main        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/heads/bar        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/heads/baz        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic2        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic1        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/heads/foo        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic3        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic2        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic1        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic3        Z
+	> remote: proc-receive> ok refs/for/next/topic2        Z
+	> remote: proc-receive> ng refs/for/next/topic1 fail to call Web API        Z
+	> remote: proc-receive> ok refs/for/main/topic        Z
+	> remote: proc-receive> option refname refs/for/main/topic        Z
+	> remote: proc-receive> option old-oid <COMMIT-A>        Z
+	> remote: proc-receive> option new-oid <COMMIT-B>        Z
+	> remote: # post-receive hook        Z
+	> remote: post-receive< <COMMIT-A> <COMMIT-B> refs/heads/main        Z
+	> remote: post-receive< <ZERO-OID> <COMMIT-A> refs/heads/bar        Z
+	> remote: post-receive< <ZERO-OID> <COMMIT-A> refs/heads/baz        Z
+	> remote: post-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic2        Z
+	> remote: post-receive< <ZERO-OID> <COMMIT-A> refs/heads/foo        Z
+	> remote: post-receive< <COMMIT-A> <COMMIT-B> refs/for/main/topic        Z
+	> To <URL/of/upstream.git>
+	>    <COMMIT-A>..<COMMIT-B>  <COMMIT-B> -> main
+	>  * [new branch]      HEAD -> bar
+	>  * [new branch]      HEAD -> baz
+	>  * [new reference]   HEAD -> refs/for/next/topic2
+	>  * [new branch]      HEAD -> foo
+	>    <COMMIT-A>..<COMMIT-B>  HEAD -> refs/for/main/topic
+	>  ! [remote rejected] HEAD -> refs/for/next/topic1 (fail to call Web API)
+	>  ! [remote rejected] HEAD -> refs/for/next/topic3 (proc-receive failed to report status)
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/bar
+	<COMMIT-A> refs/heads/baz
+	<COMMIT-A> refs/heads/foo
+	<COMMIT-B> refs/heads/main
+	EOF
+'
+
+# Refs of upstream : main(B)             foo(A)  bar(A))  baz(A)
+# Refs of workbench: main(A)  tags/v123
+test_expect_success "cleanup ($PROTOCOL)" '
+	(
+		cd "$upstream" &&
+		git update-ref refs/heads/main $A &&
+		git update-ref -d refs/heads/foo &&
+		git update-ref -d refs/heads/bar &&
+		git update-ref -d refs/heads/baz
+	)
+'
diff --git a/t/t5411/test-0039-report-mixed-refs--porcelain.sh b/t/t5411/test-0039-report-mixed-refs--porcelain.sh
new file mode 100644
index 0000000..40f4c5b
--- /dev/null
+++ b/t/t5411/test-0039-report-mixed-refs--porcelain.sh
@@ -0,0 +1,89 @@
+test_expect_success "setup proc-receive hook ($PROTOCOL/porcelain)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/next/topic2" \
+		-r "ng refs/for/next/topic1 fail to call Web API" \
+		-r "ok refs/for/main/topic" \
+		-r "option refname refs/for/main/topic" \
+		-r "option old-oid $A" \
+		-r "option new-oid $B"
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         : (B)                   bar(A)  baz(A)  refs/for/next/topic(A)  foo(A)  refs/for/main/topic(A)
+test_expect_success "proc-receive: report update of mixed refs ($PROTOCOL/porcelain)" '
+	test_must_fail git -C workbench push --porcelain origin \
+		$B:refs/heads/main \
+		HEAD:refs/heads/bar \
+		HEAD:refs/heads/baz \
+		HEAD:refs/for/next/topic2 \
+		HEAD:refs/for/next/topic1 \
+		HEAD:refs/heads/foo \
+		HEAD:refs/for/main/topic \
+		HEAD:refs/for/next/topic3 \
+		>out-$test_count 2>&1 &&
+	make_user_friendly_and_stable_output <out-$test_count >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <COMMIT-A> <COMMIT-B> refs/heads/main        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/heads/bar        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/heads/baz        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic2        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic1        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/heads/foo        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic3        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic2        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic1        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic3        Z
+	> remote: proc-receive> ok refs/for/next/topic2        Z
+	> remote: proc-receive> ng refs/for/next/topic1 fail to call Web API        Z
+	> remote: proc-receive> ok refs/for/main/topic        Z
+	> remote: proc-receive> option refname refs/for/main/topic        Z
+	> remote: proc-receive> option old-oid <COMMIT-A>        Z
+	> remote: proc-receive> option new-oid <COMMIT-B>        Z
+	> remote: # post-receive hook        Z
+	> remote: post-receive< <COMMIT-A> <COMMIT-B> refs/heads/main        Z
+	> remote: post-receive< <ZERO-OID> <COMMIT-A> refs/heads/bar        Z
+	> remote: post-receive< <ZERO-OID> <COMMIT-A> refs/heads/baz        Z
+	> remote: post-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic2        Z
+	> remote: post-receive< <ZERO-OID> <COMMIT-A> refs/heads/foo        Z
+	> remote: post-receive< <COMMIT-A> <COMMIT-B> refs/for/main/topic        Z
+	> To <URL/of/upstream.git>
+	>  	<COMMIT-B>:refs/heads/main	<COMMIT-A>..<COMMIT-B>
+	> *	HEAD:refs/heads/bar	[new branch]
+	> *	HEAD:refs/heads/baz	[new branch]
+	> *	HEAD:refs/for/next/topic2	[new reference]
+	> *	HEAD:refs/heads/foo	[new branch]
+	>  	HEAD:refs/for/main/topic	<COMMIT-A>..<COMMIT-B>
+	> !	HEAD:refs/for/next/topic1	[remote rejected] (fail to call Web API)
+	> !	HEAD:refs/for/next/topic3	[remote rejected] (proc-receive failed to report status)
+	> Done
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/bar
+	<COMMIT-A> refs/heads/baz
+	<COMMIT-A> refs/heads/foo
+	<COMMIT-B> refs/heads/main
+	EOF
+'
+
+# Refs of upstream : main(B)             foo(A)  bar(A))  baz(A)
+# Refs of workbench: main(A)  tags/v123
+test_expect_success "cleanup ($PROTOCOL/porcelain)" '
+	(
+		cd "$upstream" &&
+		git update-ref refs/heads/main $A &&
+		git update-ref -d refs/heads/foo &&
+		git update-ref -d refs/heads/bar &&
+		git update-ref -d refs/heads/baz
+	)
+
+'
diff --git a/t/t5411/test-0040-process-all-refs.sh b/t/t5411/test-0040-process-all-refs.sh
new file mode 100644
index 0000000..7ae3851
--- /dev/null
+++ b/t/t5411/test-0040-process-all-refs.sh
@@ -0,0 +1,111 @@
+test_expect_success "config receive.procReceiveRefs = refs ($PROTOCOL)" '
+	git -C "$upstream" config --unset-all receive.procReceiveRefs &&
+	git -C "$upstream" config --add receive.procReceiveRefs refs
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+test_expect_success "setup upstream branches ($PROTOCOL)" '
+	(
+		cd "$upstream" &&
+		git update-ref refs/heads/main $B &&
+		git update-ref refs/heads/foo $A &&
+		git update-ref refs/heads/bar $A &&
+		git update-ref refs/heads/baz $A
+	)
+
+'
+
+test_expect_success "setup proc-receive hook ($PROTOCOL)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/heads/main" \
+		-r "option fall-through" \
+		-r "ok refs/heads/foo" \
+		-r "option fall-through" \
+		-r "ok refs/heads/bar" \
+		-r "option fall-through" \
+		-r "ok refs/for/main/topic" \
+		-r "option refname refs/pull/123/head" \
+		-r "option old-oid $A" \
+		-r "option new-oid $B" \
+		-r "ok refs/for/next/topic" \
+		-r "option refname refs/pull/124/head" \
+		-r "option old-oid $B" \
+		-r "option new-oid $A" \
+		-r "option forced-update"
+	EOF
+'
+
+# Refs of upstream : main(B)             foo(A)  bar(A))  baz(A)
+# Refs of workbench: main(A)  tags/v123
+# git push -f      : main(A)             (NULL)  (B)              refs/for/main/topic(A)  refs/for/next/topic(A)
+test_expect_success "proc-receive: process all refs ($PROTOCOL)" '
+	git -C workbench push -f origin \
+		HEAD:refs/heads/main \
+		:refs/heads/foo \
+		$B:refs/heads/bar \
+		HEAD:refs/for/main/topic \
+		HEAD:refs/for/next/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <COMMIT-A> <COMMIT-B> refs/heads/bar        Z
+	> remote: pre-receive< <COMMIT-A> <ZERO-OID> refs/heads/foo        Z
+	> remote: pre-receive< <COMMIT-B> <COMMIT-A> refs/heads/main        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive< <COMMIT-A> <COMMIT-B> refs/heads/bar        Z
+	> remote: proc-receive< <COMMIT-A> <ZERO-OID> refs/heads/foo        Z
+	> remote: proc-receive< <COMMIT-B> <COMMIT-A> refs/heads/main        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic        Z
+	> remote: proc-receive> ok refs/heads/main        Z
+	> remote: proc-receive> option fall-through        Z
+	> remote: proc-receive> ok refs/heads/foo        Z
+	> remote: proc-receive> option fall-through        Z
+	> remote: proc-receive> ok refs/heads/bar        Z
+	> remote: proc-receive> option fall-through        Z
+	> remote: proc-receive> ok refs/for/main/topic        Z
+	> remote: proc-receive> option refname refs/pull/123/head        Z
+	> remote: proc-receive> option old-oid <COMMIT-A>        Z
+	> remote: proc-receive> option new-oid <COMMIT-B>        Z
+	> remote: proc-receive> ok refs/for/next/topic        Z
+	> remote: proc-receive> option refname refs/pull/124/head        Z
+	> remote: proc-receive> option old-oid <COMMIT-B>        Z
+	> remote: proc-receive> option new-oid <COMMIT-A>        Z
+	> remote: proc-receive> option forced-update        Z
+	> remote: # post-receive hook        Z
+	> remote: post-receive< <COMMIT-A> <COMMIT-B> refs/heads/bar        Z
+	> remote: post-receive< <COMMIT-A> <ZERO-OID> refs/heads/foo        Z
+	> remote: post-receive< <COMMIT-B> <COMMIT-A> refs/heads/main        Z
+	> remote: post-receive< <COMMIT-A> <COMMIT-B> refs/pull/123/head        Z
+	> remote: post-receive< <COMMIT-B> <COMMIT-A> refs/pull/124/head        Z
+	> To <URL/of/upstream.git>
+	>    <COMMIT-A>..<COMMIT-B>  <COMMIT-B> -> bar
+	>  - [deleted]         foo
+	>  + <COMMIT-B>...<COMMIT-A> HEAD -> main (forced update)
+	>    <COMMIT-A>..<COMMIT-B>  HEAD -> refs/pull/123/head
+	>  + <COMMIT-B>...<COMMIT-A> HEAD -> refs/pull/124/head (forced update)
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-B> refs/heads/bar
+	<COMMIT-A> refs/heads/baz
+	<COMMIT-A> refs/heads/main
+	EOF
+'
+
+# Refs of upstream : main(A)             bar(A)  baz(B)
+# Refs of workbench: main(A)  tags/v123
+test_expect_success "cleanup ($PROTOCOL)" '
+	(
+		cd "$upstream" &&
+		git update-ref -d refs/heads/bar &&
+		git update-ref -d refs/heads/baz
+	)
+'
diff --git a/t/t5411/test-0041-process-all-refs--porcelain.sh b/t/t5411/test-0041-process-all-refs--porcelain.sh
new file mode 100644
index 0000000..02e1e08
--- /dev/null
+++ b/t/t5411/test-0041-process-all-refs--porcelain.sh
@@ -0,0 +1,112 @@
+test_expect_success "config receive.procReceiveRefs = refs ($PROTOCOL/porcelain)" '
+	git -C "$upstream" config --unset-all receive.procReceiveRefs &&
+	git -C "$upstream" config --add receive.procReceiveRefs refs
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+test_expect_success "setup upstream branches ($PROTOCOL/porcelain)" '
+	(
+		cd "$upstream" &&
+		git update-ref refs/heads/main $B &&
+		git update-ref refs/heads/foo $A &&
+		git update-ref refs/heads/bar $A &&
+		git update-ref refs/heads/baz $A
+	)
+
+'
+
+test_expect_success "setup proc-receive hook ($PROTOCOL/porcelain)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/heads/main" \
+		-r "option fall-through" \
+		-r "ok refs/heads/foo" \
+		-r "option fall-through" \
+		-r "ok refs/heads/bar" \
+		-r "option fall-through" \
+		-r "ok refs/for/main/topic" \
+		-r "option refname refs/pull/123/head" \
+		-r "option old-oid $A" \
+		-r "option new-oid $B" \
+		-r "ok refs/for/next/topic" \
+		-r "option refname refs/pull/124/head" \
+		-r "option old-oid $B" \
+		-r "option new-oid $A" \
+		-r "option forced-update"
+	EOF
+'
+
+# Refs of upstream : main(B)             foo(A)  bar(A))  baz(A)
+# Refs of workbench: main(A)  tags/v123
+# git push -f      : main(A)             (NULL)  (B)              refs/for/main/topic(A)  refs/for/next/topic(A)
+test_expect_success "proc-receive: process all refs ($PROTOCOL/porcelain)" '
+	git -C workbench push --porcelain -f origin \
+		HEAD:refs/heads/main \
+		:refs/heads/foo \
+		$B:refs/heads/bar \
+		HEAD:refs/for/main/topic \
+		HEAD:refs/for/next/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <COMMIT-A> <COMMIT-B> refs/heads/bar        Z
+	> remote: pre-receive< <COMMIT-A> <ZERO-OID> refs/heads/foo        Z
+	> remote: pre-receive< <COMMIT-B> <COMMIT-A> refs/heads/main        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive< <COMMIT-A> <COMMIT-B> refs/heads/bar        Z
+	> remote: proc-receive< <COMMIT-A> <ZERO-OID> refs/heads/foo        Z
+	> remote: proc-receive< <COMMIT-B> <COMMIT-A> refs/heads/main        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/main/topic        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic        Z
+	> remote: proc-receive> ok refs/heads/main        Z
+	> remote: proc-receive> option fall-through        Z
+	> remote: proc-receive> ok refs/heads/foo        Z
+	> remote: proc-receive> option fall-through        Z
+	> remote: proc-receive> ok refs/heads/bar        Z
+	> remote: proc-receive> option fall-through        Z
+	> remote: proc-receive> ok refs/for/main/topic        Z
+	> remote: proc-receive> option refname refs/pull/123/head        Z
+	> remote: proc-receive> option old-oid <COMMIT-A>        Z
+	> remote: proc-receive> option new-oid <COMMIT-B>        Z
+	> remote: proc-receive> ok refs/for/next/topic        Z
+	> remote: proc-receive> option refname refs/pull/124/head        Z
+	> remote: proc-receive> option old-oid <COMMIT-B>        Z
+	> remote: proc-receive> option new-oid <COMMIT-A>        Z
+	> remote: proc-receive> option forced-update        Z
+	> remote: # post-receive hook        Z
+	> remote: post-receive< <COMMIT-A> <COMMIT-B> refs/heads/bar        Z
+	> remote: post-receive< <COMMIT-A> <ZERO-OID> refs/heads/foo        Z
+	> remote: post-receive< <COMMIT-B> <COMMIT-A> refs/heads/main        Z
+	> remote: post-receive< <COMMIT-A> <COMMIT-B> refs/pull/123/head        Z
+	> remote: post-receive< <COMMIT-B> <COMMIT-A> refs/pull/124/head        Z
+	> To <URL/of/upstream.git>
+	>  	<COMMIT-B>:refs/heads/bar	<COMMIT-A>..<COMMIT-B>
+	> -	:refs/heads/foo	[deleted]
+	> +	HEAD:refs/heads/main	<COMMIT-B>...<COMMIT-A> (forced update)
+	>  	HEAD:refs/pull/123/head	<COMMIT-A>..<COMMIT-B>
+	> +	HEAD:refs/pull/124/head	<COMMIT-B>...<COMMIT-A> (forced update)
+	> Done
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-B> refs/heads/bar
+	<COMMIT-A> refs/heads/baz
+	<COMMIT-A> refs/heads/main
+	EOF
+'
+
+# Refs of upstream : main(A)             bar(A)  baz(B)
+# Refs of workbench: main(A)  tags/v123
+test_expect_success "cleanup ($PROTOCOL/porcelain)" '
+	(
+		cd "$upstream" &&
+		git update-ref -d refs/heads/bar &&
+		git update-ref -d refs/heads/baz
+	)
+'
diff --git a/t/t5411/test-0050-proc-receive-refs-with-modifiers.sh b/t/t5411/test-0050-proc-receive-refs-with-modifiers.sh
new file mode 100644
index 0000000..7efdfe5
--- /dev/null
+++ b/t/t5411/test-0050-proc-receive-refs-with-modifiers.sh
@@ -0,0 +1,129 @@
+test_expect_success "config receive.procReceiveRefs with modifiers ($PROTOCOL)" '
+	(
+		cd "$upstream" &&
+		git config --unset-all receive.procReceiveRefs &&
+		git config --add receive.procReceiveRefs m:refs/heads/main &&
+		git config --add receive.procReceiveRefs ad:refs/heads &&
+		git config --add receive.procReceiveRefs "a!:refs/heads"
+	)
+'
+
+test_expect_success "setup proc-receive hook ($PROTOCOL)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/heads/main" \
+		-r "option refname refs/pull/123/head" \
+		-r "option old-oid $A" \
+		-r "option new-oid $B" \
+		-r "ok refs/tags/v123 " \
+		-r "option refname refs/pull/124/head"
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+# git push         : main(B)  tags/v123
+test_expect_success "proc-receive: update branch and new tag ($PROTOCOL)" '
+	git -C workbench push origin \
+		$B:refs/heads/main \
+		v123 >out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <COMMIT-A> <COMMIT-B> refs/heads/main        Z
+	> remote: pre-receive< <ZERO-OID> <TAG-v123> refs/tags/v123        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive< <COMMIT-A> <COMMIT-B> refs/heads/main        Z
+	> remote: proc-receive< <ZERO-OID> <TAG-v123> refs/tags/v123        Z
+	> remote: proc-receive> ok refs/heads/main        Z
+	> remote: proc-receive> option refname refs/pull/123/head        Z
+	> remote: proc-receive> option old-oid <COMMIT-A>        Z
+	> remote: proc-receive> option new-oid <COMMIT-B>        Z
+	> remote: proc-receive> ok refs/tags/v123         Z
+	> remote: proc-receive> option refname refs/pull/124/head        Z
+	> remote: # post-receive hook        Z
+	> remote: post-receive< <COMMIT-A> <COMMIT-B> refs/pull/123/head        Z
+	> remote: post-receive< <ZERO-OID> <TAG-v123> refs/pull/124/head        Z
+	> To <URL/of/upstream.git>
+	>    <COMMIT-A>..<COMMIT-B>  <COMMIT-B> -> refs/pull/123/head
+	>  * [new reference]   v123 -> refs/pull/124/head
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/main
+	EOF
+'
+
+# Refs of upstream : main(A)
+# Refs of workbench: main(A)  tags/v123
+test_expect_success "setup upstream: create tags/v123 ($PROTOCOL)" '
+	git -C "$upstream" update-ref refs/heads/topic $A &&
+	git -C "$upstream" update-ref refs/tags/v123 $TAG &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/main
+	<COMMIT-A> refs/heads/topic
+	<TAG-v123> refs/tags/v123
+	EOF
+'
+
+test_expect_success "setup proc-receive hook ($PROTOCOL)" '
+	test_hook -C "$upstream" --clobber proc-receive <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/heads/main" \
+		-r "option refname refs/pull/123/head" \
+		-r "option old-oid $A" \
+		-r "option new-oid $ZERO_OID" \
+		-r "ok refs/heads/next" \
+		-r "option refname refs/pull/124/head" \
+		-r "option new-oid $A"
+	EOF
+'
+
+# Refs of upstream : main(A)  topic(A)  tags/v123
+# Refs of workbench: main(A)            tags/v123
+# git push         : NULL       topic(B)  NULL       next(A)
+test_expect_success "proc-receive: create/delete branch, and delete tag ($PROTOCOL)" '
+	git -C workbench push origin \
+		:refs/heads/main \
+		$B:refs/heads/topic \
+		$A:refs/heads/next \
+		:refs/tags/v123 >out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	format_and_save_expect <<-EOF &&
+	> remote: # pre-receive hook        Z
+	> remote: pre-receive< <COMMIT-A> <ZERO-OID> refs/heads/main        Z
+	> remote: pre-receive< <COMMIT-A> <COMMIT-B> refs/heads/topic        Z
+	> remote: pre-receive< <TAG-v123> <ZERO-OID> refs/tags/v123        Z
+	> remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/heads/next        Z
+	> remote: # proc-receive hook        Z
+	> remote: proc-receive< <COMMIT-A> <ZERO-OID> refs/heads/main        Z
+	> remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/heads/next        Z
+	> remote: proc-receive> ok refs/heads/main        Z
+	> remote: proc-receive> option refname refs/pull/123/head        Z
+	> remote: proc-receive> option old-oid <COMMIT-A>        Z
+	> remote: proc-receive> option new-oid <ZERO-OID>        Z
+	> remote: proc-receive> ok refs/heads/next        Z
+	> remote: proc-receive> option refname refs/pull/124/head        Z
+	> remote: proc-receive> option new-oid <COMMIT-A>        Z
+	> remote: # post-receive hook        Z
+	> remote: post-receive< <COMMIT-A> <ZERO-OID> refs/pull/123/head        Z
+	> remote: post-receive< <COMMIT-A> <COMMIT-B> refs/heads/topic        Z
+	> remote: post-receive< <TAG-v123> <ZERO-OID> refs/tags/v123        Z
+	> remote: post-receive< <ZERO-OID> <COMMIT-A> refs/pull/124/head        Z
+	> To <URL/of/upstream.git>
+	>  - [deleted]         refs/pull/123/head
+	>    <COMMIT-A>..<COMMIT-B>  <COMMIT-B> -> topic
+	>  - [deleted]         v123
+	>  * [new reference]   <COMMIT-A> -> refs/pull/124/head
+	EOF
+	test_cmp expect actual &&
+
+	test_cmp_refs -C "$upstream" <<-EOF
+	<COMMIT-A> refs/heads/main
+	<COMMIT-B> refs/heads/topic
+	EOF
+'
diff --git a/t/t5500-fetch-pack.sh b/t/t5500-fetch-pack.sh
index 3557374..1bc15a3 100755
--- a/t/t5500-fetch-pack.sh
+++ b/t/t5500-fetch-pack.sh
@@ -5,6 +5,9 @@
 
 test_description='Testing multi_ack pack fetching'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 # Test fetch-pack/upload-pack pair.
@@ -92,7 +95,7 @@ test_expect_success 'setup' '
 	while [ $cur -le 10 ]; do
 		add A$cur $(eval echo \$A$prev) &&
 		prev=$cur &&
-		cur=$(($cur+1))
+		cur=$(($cur+1)) || return 1
 	done &&
 	add B1 $A1 &&
 	git update-ref refs/heads/A "$ATIP" &&
@@ -109,7 +112,7 @@ test_expect_success 'post 1st pull setup' '
 	while [ $cur -le 65 ]; do
 		add B$cur $(eval echo \$B$prev) &&
 		prev=$cur &&
-		cur=$(($cur+1))
+		cur=$(($cur+1)) || return 1
 	done
 '
 
@@ -129,13 +132,18 @@ test_expect_success 'single branch object count' '
 '
 
 test_expect_success 'single given branch clone' '
-	git clone --single-branch --branch A "file://$(pwd)/." branch-a &&
-	test_must_fail git --git-dir=branch-a/.git rev-parse origin/B
+	GIT_TRACE2_EVENT="$(pwd)/branch-a/trace2_event" \
+		git clone --single-branch --branch A "file://$(pwd)/." branch-a &&
+	test_must_fail git --git-dir=branch-a/.git rev-parse origin/B &&
+	grep \"fetch-info\".*\"haves\":0 branch-a/trace2_event &&
+	grep \"fetch-info\".*\"wants\":1 branch-a/trace2_event
 '
 
 test_expect_success 'clone shallow depth 1' '
-	git clone --no-single-branch --depth 1 "file://$(pwd)/." shallow0 &&
-	test "$(git --git-dir=shallow0/.git rev-list --count HEAD)" = 1
+	GIT_TRACE2_EVENT="$(pwd)/shallow0/trace2_event" \
+		git clone --no-single-branch --depth 1 "file://$(pwd)/." shallow0 &&
+	test "$(git --git-dir=shallow0/.git rev-list --count HEAD)" = 1 &&
+	grep \"fetch-info\".*\"depth\":1 shallow0/trace2_event
 '
 
 test_expect_success 'clone shallow depth 1 with fsck' '
@@ -232,7 +240,10 @@ test_expect_success 'add two more (part 2)' '
 test_expect_success 'deepening pull in shallow repo' '
 	(
 		cd shallow &&
-		git pull --depth 4 .. B
+		GIT_TRACE2_EVENT="$(pwd)/trace2_event" \
+			git pull --depth 4 .. B &&
+		grep \"fetch-info\".*\"depth\":4 trace2_event &&
+		grep \"fetch-info\".*\"shallows\":2 trace2_event
 	)
 '
 
@@ -303,9 +314,12 @@ test_expect_success 'fetch --depth --no-shallow' '
 test_expect_success 'turn shallow to complete repository' '
 	(
 		cd shallow &&
-		git fetch --unshallow &&
+		GIT_TRACE2_EVENT="$(pwd)/trace2_event" \
+			git fetch --unshallow &&
 		! test -f .git/shallow &&
-		git fsck --full
+		git fsck --full &&
+		grep \"fetch-info\".*\"shallows\":2 trace2_event &&
+		grep \"fetch-info\".*\"depth\":2147483647 trace2_event
 	)
 '
 
@@ -400,21 +414,22 @@ test_expect_success 'in_vain not triggered before first ACK' '
 	test_commit -C myserver bar &&
 
 	git -C myclient fetch --progress origin 2>log &&
-	test_i18ngrep "remote: Total 3 " log
+	test_grep "remote: Total 3 " log
 '
 
 test_expect_success 'in_vain resetted upon ACK' '
+	test_when_finished rm -f log trace2 &&
 	rm -rf myserver myclient &&
 	git init myserver &&
 
-	# Linked list of commits on master. The first is common; the rest are
+	# Linked list of commits on main. The first is common; the rest are
 	# not.
-	test_commit -C myserver first_master_commit &&
+	test_commit -C myserver first_main_commit &&
 	git clone "file://$(pwd)/myserver" myclient &&
 	test_commit_bulk -C myclient 255 &&
 
 	# Another linked list of commits on anotherbranch with no connection to
-	# master. The first is common; the rest are not.
+	# main. The first is common; the rest are not.
 	git -C myserver checkout --orphan anotherbranch &&
 	test_commit -C myserver first_anotherbranch_commit &&
 	git -C myclient fetch origin anotherbranch:refs/heads/anotherbranch &&
@@ -422,15 +437,16 @@ test_expect_success 'in_vain resetted upon ACK' '
 	test_commit_bulk -C myclient 255 &&
 
 	# The new commit that the client wants to fetch.
-	git -C myserver checkout master &&
+	git -C myserver checkout main &&
 	test_commit -C myserver to_fetch &&
 
 	# The client will send (as "have"s) all 256 commits in anotherbranch
 	# first. The 256th commit is common between the client and the server,
 	# and should reset in_vain. This allows negotiation to continue until
 	# the client reports that first_anotherbranch_commit is common.
-	git -C myclient fetch --progress origin master 2>log &&
-	test_i18ngrep "Total 3 " log
+	GIT_TRACE2_EVENT="$(pwd)/trace2" git -C myclient fetch --progress origin main 2>log &&
+	grep \"key\":\"total_rounds\",\"value\":\"6\" trace2 &&
+	test_grep "Total 3 " log
 '
 
 test_expect_success 'fetch in shallow repo unreachable shallow objects' '
@@ -454,18 +470,18 @@ test_expect_success 'fetch creating new shallow root' '
 		git fetch --depth=1 --progress 2>actual &&
 		# This should fetch only the empty commit, no tree or
 		# blob objects
-		test_i18ngrep "remote: Total 1" actual
+		test_grep "remote: Total 1" actual
 	)
 '
 
 test_expect_success 'setup tests for the --stdin parameter' '
 	for head in C D E F
 	do
-		add $head
+		add $head || return 1
 	done &&
 	for head in A B C D E F
 	do
-		git tag $head $head
+		git tag $head $head || return 1
 	done &&
 	cat >input <<-\EOF &&
 	refs/heads/C
@@ -544,7 +560,7 @@ test_expect_success 'test lonely missing ref' '
 		cd client &&
 		test_must_fail git fetch-pack --no-progress .. refs/heads/xyzzy 2>../error-m
 	) &&
-	test_i18ncmp expect-error error-m
+	test_cmp expect-error error-m
 '
 
 test_expect_success 'test missing ref after existing' '
@@ -552,7 +568,7 @@ test_expect_success 'test missing ref after existing' '
 		cd client &&
 		test_must_fail git fetch-pack --no-progress .. refs/heads/A refs/heads/xyzzy 2>../error-em
 	) &&
-	test_i18ncmp expect-error error-em
+	test_cmp expect-error error-em
 '
 
 test_expect_success 'test missing ref before existing' '
@@ -560,7 +576,7 @@ test_expect_success 'test missing ref before existing' '
 		cd client &&
 		test_must_fail git fetch-pack --no-progress .. refs/heads/xyzzy refs/heads/A 2>../error-me
 	) &&
-	test_i18ncmp expect-error error-me
+	test_cmp expect-error error-me
 '
 
 test_expect_success 'test --all, --depth, and explicit head' '
@@ -637,7 +653,7 @@ test_expect_success 'shallow fetch with tags does not break the repository' '
 		mkdir repo2 &&
 		cd repo2 &&
 		git init &&
-		git fetch --depth=2 ../.git master:branch &&
+		git fetch --depth=2 ../.git main:branch &&
 		git fsck
 	)
 '
@@ -662,7 +678,7 @@ test_expect_success 'fetch-pack can fetch a raw sha1 that is advertised as a ref
 
 	git init client &&
 	git -C client fetch-pack ../server \
-		$(git -C server rev-parse refs/heads/master)
+		$(git -C server rev-parse refs/heads/main)
 '
 
 test_expect_success 'fetch-pack can fetch a raw sha1 overlapping a named ref' '
@@ -688,8 +704,8 @@ test_expect_success 'fetch-pack cannot fetch a raw sha1 that is not advertised a
 	# Some protocol versions (e.g. 2) support fetching
 	# unadvertised objects, so restrict this test to v0.
 	test_must_fail env GIT_TEST_PROTOCOL_VERSION=0 git -C client fetch-pack ../server \
-		$(git -C server rev-parse refs/heads/master^) 2>err &&
-	test_i18ngrep "Server does not allow request for unadvertised object" err
+		$(git -C server rev-parse refs/heads/main^) 2>err &&
+	test_grep "Server does not allow request for unadvertised object" err
 '
 
 check_prot_path () {
@@ -821,13 +837,15 @@ test_expect_success 'clone shallow since ...' '
 '
 
 test_expect_success 'fetch shallow since ...' '
-	git -C shallow11 fetch --shallow-since "200000000 +0700" origin &&
-	git -C shallow11 log --pretty=tformat:%s origin/master >actual &&
+	GIT_TRACE2_EVENT=$(pwd)/shallow11/trace2_event \
+		git -C shallow11 fetch --shallow-since "200000000 +0700" origin &&
+	git -C shallow11 log --pretty=tformat:%s origin/main >actual &&
 	cat >expected <<-\EOF &&
 	three
 	two
 	EOF
-	test_cmp expected actual
+	test_cmp expected actual &&
+	grep \"fetch-info\".*\"deepen-since\":true shallow11/trace2_event
 '
 
 test_expect_success 'clone shallow since selects no commits' '
@@ -863,7 +881,7 @@ test_expect_success 'shallow since with commit graph and already-seen commit' '
 	(
 	cd shallow-since-graph &&
 	test_commit base &&
-	test_commit master &&
+	test_commit main &&
 	git checkout -b other HEAD^ &&
 	test_commit other &&
 	git commit-graph write --reachable &&
@@ -874,7 +892,7 @@ test_expect_success 'shallow since with commit graph and already-seen commit' '
 	$(echo "object-format=$(test_oid algo)" | packetize)
 	00010013deepen-since 1
 	$(echo "want $(git rev-parse other)" | packetize)
-	$(echo "have $(git rev-parse master)" | packetize)
+	$(echo "have $(git rev-parse main)" | packetize)
 	0000
 	EOF
 	)
@@ -896,7 +914,7 @@ test_expect_success 'shallow clone exclude tag two' '
 
 test_expect_success 'fetch exclude tag one' '
 	git -C shallow12 fetch --shallow-exclude one origin &&
-	git -C shallow12 log --pretty=tformat:%s origin/master >actual &&
+	git -C shallow12 log --pretty=tformat:%s origin/main >actual &&
 	test_write_lines three two >expected &&
 	test_cmp expected actual
 '
@@ -910,11 +928,11 @@ test_expect_success 'fetching deepen' '
 	test_commit three &&
 	git clone --depth 1 "file://$(pwd)/." deepen &&
 	test_commit four &&
-	git -C deepen log --pretty=tformat:%s master >actual &&
+	git -C deepen log --pretty=tformat:%s main >actual &&
 	echo three >expected &&
 	test_cmp expected actual &&
 	git -C deepen fetch --deepen=1 &&
-	git -C deepen log --pretty=tformat:%s origin/master >actual &&
+	git -C deepen log --pretty=tformat:%s origin/main >actual &&
 	cat >expected <<-\EOF &&
 	four
 	three
@@ -924,7 +942,8 @@ test_expect_success 'fetching deepen' '
 	)
 '
 
-test_expect_success 'use ref advertisement to prune "have" lines sent' '
+test_negotiation_algorithm_default () {
+	test_when_finished rm -rf clientv0 clientv2 &&
 	rm -rf server client &&
 	git init server &&
 	test_commit -C server both_have_1 &&
@@ -943,7 +962,7 @@ test_expect_success 'use ref advertisement to prune "have" lines sent' '
 	rm -f trace &&
 	cp -r client clientv0 &&
 	GIT_TRACE_PACKET="$(pwd)/trace" git -C clientv0 \
-		fetch origin server_has both_have_2 &&
+		"$@" fetch origin server_has both_have_2 &&
 	grep "have $(git -C client rev-parse client_has)" trace &&
 	grep "have $(git -C client rev-parse both_have_2)" trace &&
 	! grep "have $(git -C client rev-parse both_have_2^)" trace &&
@@ -951,10 +970,27 @@ test_expect_success 'use ref advertisement to prune "have" lines sent' '
 	rm -f trace &&
 	cp -r client clientv2 &&
 	GIT_TRACE_PACKET="$(pwd)/trace" git -C clientv2 -c protocol.version=2 \
-		fetch origin server_has both_have_2 &&
+		"$@" fetch origin server_has both_have_2 &&
 	grep "have $(git -C client rev-parse client_has)" trace &&
 	grep "have $(git -C client rev-parse both_have_2)" trace &&
 	! grep "have $(git -C client rev-parse both_have_2^)" trace
+}
+
+test_expect_success 'use ref advertisement to prune "have" lines sent' '
+	test_negotiation_algorithm_default
+'
+
+test_expect_success 'same as last but with config overrides' '
+	test_negotiation_algorithm_default \
+		-c feature.experimental=true \
+		-c fetch.negotiationAlgorithm=consecutive
+'
+
+test_expect_success 'ensure bogus fetch.negotiationAlgorithm yields error' '
+	test_when_finished rm -rf clientv0 &&
+	cp -r client clientv0 &&
+	test_must_fail git -C clientv0 --fetch.negotiationAlgorithm=bogus \
+		       fetch origin server_has both_have_2
 '
 
 test_expect_success 'filtering by size' '
@@ -964,13 +1000,16 @@ test_expect_success 'filtering by size' '
 	test_config -C server uploadpack.allowfilter 1 &&
 
 	test_create_repo client &&
-	git -C client fetch-pack --filter=blob:limit=0 ../server HEAD &&
+	GIT_TRACE2_EVENT=$(pwd)/client/trace2_event \
+		git -C client fetch-pack --filter=blob:limit=0 ../server HEAD &&
 
 	# Ensure that object is not inadvertently fetched
 	commit=$(git -C server rev-parse HEAD) &&
 	blob=$(git hash-object server/one.t) &&
 	git -C client rev-list --objects --missing=allow-any "$commit" >oids &&
-	! grep "$blob" oids
+	! grep "$blob" oids &&
+
+	grep \"fetch-info\".*\"filter\":\"blob:limit\" client/trace2_event
 '
 
 test_expect_success 'filtering by size has no effect if support for it is not advertised' '
@@ -987,7 +1026,7 @@ test_expect_success 'filtering by size has no effect if support for it is not ad
 	git -C client rev-list --objects --missing=allow-any "$commit" >oids &&
 	grep "$blob" oids &&
 
-	test_i18ngrep "filtering not recognized by server" err
+	test_grep "filtering not recognized by server" err
 '
 
 fetch_filter_blob_limit_zero () {
diff --git a/t/t5501-fetch-push-alternates.sh b/t/t5501-fetch-push-alternates.sh
index 1bc57ac..66f19a4 100755
--- a/t/t5501-fetch-push-alternates.sh
+++ b/t/t5501-fetch-push-alternates.sh
@@ -1,6 +1,9 @@
 #!/bin/sh
 
 test_description='fetch/push involving alternates'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 count_objects () {
@@ -45,7 +48,7 @@ test_expect_success setup '
 test_expect_success 'pushing into a repository with the same alternate' '
 	(
 		cd one &&
-		git push ../receiver master:refs/heads/it
+		git push ../receiver main:refs/heads/it
 	) &&
 	(
 		cd receiver &&
@@ -57,7 +60,7 @@ test_expect_success 'pushing into a repository with the same alternate' '
 test_expect_success 'fetching from a repository with the same alternate' '
 	(
 		cd fetcher &&
-		git fetch ../one master:refs/heads/it &&
+		git fetch ../one main:refs/heads/it &&
 		count_objects >../fetcher.count
 	) &&
 	test_cmp one.count fetcher.count
diff --git a/t/t5502-quickfetch.sh b/t/t5502-quickfetch.sh
index 7a46cbd..7b3ff21 100755
--- a/t/t5502-quickfetch.sh
+++ b/t/t5502-quickfetch.sh
@@ -2,6 +2,10 @@
 
 test_description='test quickfetch from local'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -108,14 +112,14 @@ test_expect_success 'quickfetch should not copy from alternate' '
 				q
 			}"
 	) ) &&
-	origin_master=$( (
+	origin_main=$( (
 		cd quickclone &&
-		git rev-parse origin/master
+		git rev-parse origin/main
 	) ) &&
 	echo "loose objects: $obj_cnt, packfiles: $pck_cnt" &&
 	test $obj_cnt -eq 0 &&
 	test $pck_cnt -eq 0 &&
-	test z$origin_master = z$(git rev-parse master)
+	test z$origin_main = z$(git rev-parse main)
 
 '
 
@@ -127,7 +131,7 @@ test_expect_success 'quickfetch should handle ~1000 refs (on Windows)' '
 	for i in 0 1 2 3 4 5 6 7 8 9; do
 		for j in 0 1 2 3 4 5 6 7 8 9; do
 			for k in 0 1 2 3 4 5 6 7 8 9; do
-				echo "$branchprefix$i$j$k" >> .git/packed-refs
+				echo "$branchprefix$i$j$k" >> .git/packed-refs || return 1
 			done
 		done
 	done &&
diff --git a/t/t5503-tagfollow.sh b/t/t5503-tagfollow.sh
index 6041a4d..5ebbaa4 100755
--- a/t/t5503-tagfollow.sh
+++ b/t/t5503-tagfollow.sh
@@ -2,6 +2,10 @@
 
 test_description='test automatic tag following'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # End state of the repository:
@@ -11,7 +15,7 @@ test_description='test automatic tag following'
 #   L - A ------ O ------ B
 #    \   \                 \
 #     \   C - origin/cat    \
-#      origin/master         master
+#      origin/main           main
 
 test_expect_success setup '
 	test_tick &&
@@ -57,7 +61,7 @@ test_expect_success 'fetch A (new commit : 1 connection)' '
 	(
 		cd cloned &&
 		GIT_TRACE_PACKET=$UPATH git fetch &&
-		test $A = $(git rev-parse --verify origin/master)
+		test $A = $(git rev-parse --verify origin/main)
 	) &&
 	get_needs $U >actual &&
 	test_cmp expect actual
@@ -72,7 +76,7 @@ test_expect_success "create tag T on A, create C on branch cat" '
 	git add file &&
 	git commit -m C &&
 	C=$(git rev-parse --verify HEAD) &&
-	git checkout master
+	git checkout main
 '
 
 test_expect_success 'setup expect' '
@@ -123,7 +127,7 @@ test_expect_success 'fetch B, S (commit and tag : 1 connection)' '
 	(
 		cd cloned &&
 		GIT_TRACE_PACKET=$UPATH git fetch &&
-		test $B = $(git rev-parse --verify origin/master) &&
+		test $B = $(git rev-parse --verify origin/main) &&
 		test $B = $(git rev-parse --verify tag2^0) &&
 		test $S = $(git rev-parse --verify tag2)
 	) &&
@@ -138,7 +142,7 @@ want $S
 EOF
 '
 
-test_expect_success 'new clone fetch master and tags' '
+test_expect_success 'new clone fetch main and tags' '
 	test_might_fail git branch -D cat &&
 	rm -f $U &&
 	(
@@ -147,7 +151,7 @@ test_expect_success 'new clone fetch master and tags' '
 		git init &&
 		git remote add origin .. &&
 		GIT_TRACE_PACKET=$UPATH git fetch &&
-		test $B = $(git rev-parse --verify origin/master) &&
+		test $B = $(git rev-parse --verify origin/main) &&
 		test $S = $(git rev-parse --verify tag2) &&
 		test $B = $(git rev-parse --verify tag2^0) &&
 		test $T = $(git rev-parse --verify tag1) &&
diff --git a/t/t5504-fetch-receive-strict.sh b/t/t5504-fetch-receive-strict.sh
index 1a16ac4..138e677 100755
--- a/t/t5504-fetch-receive-strict.sh
+++ b/t/t5504-fetch-receive-strict.sh
@@ -1,6 +1,10 @@
 #!/bin/sh
 
 test_description='fetch/receive strict mode'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup and inject "corrupt or missing" object' '
@@ -25,7 +29,7 @@ test_expect_success 'fetch without strict' '
 		cd dst &&
 		git config fetch.fsckobjects false &&
 		git config transfer.fsckobjects false &&
-		test_must_fail git fetch ../.git master
+		test_must_fail git fetch ../.git main
 	)
 '
 
@@ -36,7 +40,7 @@ test_expect_success 'fetch with !fetch.fsckobjects' '
 		cd dst &&
 		git config fetch.fsckobjects false &&
 		git config transfer.fsckobjects true &&
-		test_must_fail git fetch ../.git master
+		test_must_fail git fetch ../.git main
 	)
 '
 
@@ -47,7 +51,7 @@ test_expect_success 'fetch with fetch.fsckobjects' '
 		cd dst &&
 		git config fetch.fsckobjects true &&
 		git config transfer.fsckobjects false &&
-		test_must_fail git fetch ../.git master
+		test_must_fail git fetch ../.git main
 	)
 '
 
@@ -57,13 +61,13 @@ test_expect_success 'fetch with transfer.fsckobjects' '
 	(
 		cd dst &&
 		git config transfer.fsckobjects true &&
-		test_must_fail git fetch ../.git master
+		test_must_fail git fetch ../.git main
 	)
 '
 
 cat >exp <<EOF
 To dst
-!	refs/heads/master:refs/heads/test	[remote rejected] (missing necessary objects)
+!	refs/heads/main:refs/heads/test	[remote rejected] (missing necessary objects)
 Done
 EOF
 
@@ -75,7 +79,7 @@ test_expect_success 'push without strict' '
 		git config fetch.fsckobjects false &&
 		git config transfer.fsckobjects false
 	) &&
-	test_must_fail git push --porcelain dst master:refs/heads/test >act &&
+	test_must_fail git push --porcelain dst main:refs/heads/test >act &&
 	test_cmp exp act
 '
 
@@ -87,13 +91,13 @@ test_expect_success 'push with !receive.fsckobjects' '
 		git config receive.fsckobjects false &&
 		git config transfer.fsckobjects true
 	) &&
-	test_must_fail git push --porcelain dst master:refs/heads/test >act &&
+	test_must_fail git push --porcelain dst main:refs/heads/test >act &&
 	test_cmp exp act
 '
 
 cat >exp <<EOF
 To dst
-!	refs/heads/master:refs/heads/test	[remote rejected] (unpacker error)
+!	refs/heads/main:refs/heads/test	[remote rejected] (unpacker error)
 EOF
 
 test_expect_success 'push with receive.fsckobjects' '
@@ -104,7 +108,7 @@ test_expect_success 'push with receive.fsckobjects' '
 		git config receive.fsckobjects true &&
 		git config transfer.fsckobjects false
 	) &&
-	test_must_fail git push --porcelain dst master:refs/heads/test >act &&
+	test_must_fail git push --porcelain dst main:refs/heads/test >act &&
 	test_cmp exp act
 '
 
@@ -115,7 +119,7 @@ test_expect_success 'push with transfer.fsckobjects' '
 		cd dst &&
 		git config transfer.fsckobjects true
 	) &&
-	test_must_fail git push --porcelain dst master:refs/heads/test >act &&
+	test_must_fail git push --porcelain dst main:refs/heads/test >act &&
 	test_cmp exp act
 '
 
@@ -135,12 +139,12 @@ This commit object intentionally broken
 EOF
 
 test_expect_success 'setup bogus commit' '
-	commit="$(git hash-object -t commit -w --stdin <bogus-commit)"
+	commit="$(git hash-object --literally -t commit -w --stdin <bogus-commit)"
 '
 
 test_expect_success 'fsck with no skipList input' '
 	test_must_fail git fsck 2>err &&
-	test_i18ngrep "missingEmail" err
+	test_grep "missingEmail" err
 '
 
 test_expect_success 'setup sorted and unsorted skipLists' '
@@ -165,9 +169,9 @@ test_expect_success 'fsck with unsorted skipList' '
 test_expect_success 'fsck with invalid or bogus skipList input' '
 	git -c fsck.skipList=/dev/null -c fsck.missingEmail=ignore fsck &&
 	test_must_fail git -c fsck.skipList=does-not-exist -c fsck.missingEmail=ignore fsck 2>err &&
-	test_i18ngrep "could not open.*: does-not-exist" err &&
+	test_grep "could not open.*: does-not-exist" err &&
 	test_must_fail git -c fsck.skipList=.git/config -c fsck.missingEmail=ignore fsck 2>err &&
-	test_i18ngrep "invalid object name: \[core\]" err
+	test_grep "invalid object name: \[core\]" err
 '
 
 test_expect_success 'fsck with other accepted skipList input (comments & empty lines)' '
@@ -176,14 +180,14 @@ test_expect_success 'fsck with other accepted skipList input (comments & empty l
 	$(test_oid 001)
 	EOF
 	test_must_fail git -c fsck.skipList=SKIP.with-comment fsck 2>err-with-comment &&
-	test_i18ngrep "missingEmail" err-with-comment &&
+	test_grep "missingEmail" err-with-comment &&
 	cat >SKIP.with-empty-line <<-EOF &&
 	$(test_oid 001)
 
 	$(test_oid 002)
 	EOF
 	test_must_fail git -c fsck.skipList=SKIP.with-empty-line fsck 2>err-with-empty-line &&
-	test_i18ngrep "missingEmail" err-with-empty-line
+	test_grep "missingEmail" err-with-empty-line
 '
 
 test_expect_success 'fsck no garbage output from comments & empty lines errors' '
@@ -194,7 +198,7 @@ test_expect_success 'fsck no garbage output from comments & empty lines errors'
 test_expect_success 'fsck with invalid abbreviated skipList input' '
 	echo $commit | test_copy_bytes 20 >SKIP.abbreviated &&
 	test_must_fail git -c fsck.skipList=SKIP.abbreviated fsck 2>err-abbreviated &&
-	test_i18ngrep "^fatal: invalid object name: " err-abbreviated
+	test_grep "^fatal: invalid object name: " err-abbreviated
 '
 
 test_expect_success 'fsck with exhaustive accepted skipList input (various types of comments etc.)' '
@@ -227,10 +231,10 @@ test_expect_success 'push with receive.fsck.skipList' '
 	test_must_fail git push --porcelain dst bogus &&
 	git --git-dir=dst/.git config receive.fsck.skipList does-not-exist &&
 	test_must_fail git push --porcelain dst bogus 2>err &&
-	test_i18ngrep "could not open.*: does-not-exist" err &&
+	test_grep "could not open.*: does-not-exist" err &&
 	git --git-dir=dst/.git config receive.fsck.skipList config &&
 	test_must_fail git push --porcelain dst bogus 2>err &&
-	test_i18ngrep "invalid object name: \[core\]" err &&
+	test_grep "invalid object name: \[core\]" err &&
 
 	git --git-dir=dst/.git config receive.fsck.skipList SKIP &&
 	git push --porcelain dst bogus
@@ -256,10 +260,10 @@ test_expect_success 'fetch with fetch.fsck.skipList' '
 	test_must_fail git --git-dir=dst/.git fetch "file://$(pwd)" $refspec &&
 	git --git-dir=dst/.git config fetch.fsck.skipList does-not-exist &&
 	test_must_fail git --git-dir=dst/.git fetch "file://$(pwd)" $refspec 2>err &&
-	test_i18ngrep "could not open.*: does-not-exist" err &&
+	test_grep "could not open.*: does-not-exist" err &&
 	git --git-dir=dst/.git config fetch.fsck.skipList dst/.git/config &&
 	test_must_fail git --git-dir=dst/.git fetch "file://$(pwd)" $refspec 2>err &&
-	test_i18ngrep "invalid object name: \[core\]" err &&
+	test_grep "invalid object name: \[core\]" err &&
 
 	git --git-dir=dst/.git config fetch.fsck.skipList dst/.git/SKIP &&
 	git --git-dir=dst/.git fetch "file://$(pwd)" $refspec
@@ -267,7 +271,7 @@ test_expect_success 'fetch with fetch.fsck.skipList' '
 
 test_expect_success 'fsck.<unknownmsg-id> dies' '
 	test_must_fail git -c fsck.whatEver=ignore fsck 2>err &&
-	test_i18ngrep "Unhandled message id: whatever" err
+	test_grep "Unhandled message id: whatever" err
 '
 
 test_expect_success 'push with receive.fsck.missingEmail=warn' '
@@ -289,7 +293,7 @@ test_expect_success 'push with receive.fsck.missingEmail=warn' '
 		receive.fsck.missingEmail warn &&
 	git push --porcelain dst bogus >act 2>&1 &&
 	grep "missingEmail" act &&
-	test_i18ngrep "Skipping unknown msg id.*whatever" act &&
+	test_grep "skipping unknown msg id.*whatever" act &&
 	git --git-dir=dst/.git branch -D bogus &&
 	git --git-dir=dst/.git config --add \
 		receive.fsck.missingEmail ignore &&
@@ -317,7 +321,7 @@ test_expect_success 'fetch with fetch.fsck.missingEmail=warn' '
 		fetch.fsck.missingEmail warn &&
 	git --git-dir=dst/.git fetch "file://$(pwd)" $refspec >act 2>&1 &&
 	grep "missingEmail" act &&
-	test_i18ngrep "Skipping unknown msg id.*whatever" act &&
+	test_grep "Skipping unknown msg id.*whatever" act &&
 	rm -rf dst &&
 	git init dst &&
 	git --git-dir=dst/.git config fetch.fsckobjects true &&
@@ -349,4 +353,21 @@ test_expect_success \
 	grep "Cannot demote unterminatedheader" act
 '
 
+test_expect_success 'badFilemode is not a strict error' '
+	git init --bare badmode.git &&
+	tree=$(
+		cd badmode.git &&
+		blob=$(echo blob | git hash-object -w --stdin | hex2oct) &&
+		printf "123456 foo\0${blob}" |
+		git hash-object -t tree --stdin -w --literally
+	) &&
+
+	rm -rf dst.git &&
+	git init --bare dst.git &&
+	git -C dst.git config transfer.fsckObjects true &&
+
+	git -C badmode.git push ../dst.git $tree:refs/tags/tree 2>err &&
+	grep "$tree: badFilemode" err
+'
+
 test_done
diff --git a/t/t5505-remote.sh b/t/t5505-remote.sh
index 8d62edd..7789ff1 100755
--- a/t/t5505-remote.sh
+++ b/t/t5505-remote.sh
@@ -7,7 +7,7 @@ test_description='git remote porcelain-ish'
 setup_repository () {
 	mkdir "$1" && (
 	cd "$1" &&
-	git init &&
+	git init -b main &&
 	>file &&
 	git add file &&
 	test_tick &&
@@ -17,7 +17,7 @@ setup_repository () {
 	git add elif &&
 	test_tick &&
 	git commit -m "Second" &&
-	git checkout master
+	git checkout main
 	)
 }
 
@@ -56,12 +56,12 @@ test_expect_success 'add remote whose URL agrees with url.<...>.insteadOf' '
 	git remote add myremote git@host.com:team/repo.git
 '
 
-test_expect_success C_LOCALE_OUTPUT 'remote information for the origin' '
+test_expect_success 'remote information for the origin' '
 	(
 		cd test &&
 		tokens_match origin "$(git remote)" &&
-		check_remote_track origin master side &&
-		check_tracking_branch origin HEAD master side
+		check_remote_track origin main side &&
+		check_tracking_branch origin HEAD main side
 	)
 '
 
@@ -70,7 +70,7 @@ test_expect_success 'add another remote' '
 		cd test &&
 		git remote add -f second ../two &&
 		tokens_match "origin second" "$(git remote)" &&
-		check_tracking_branch second master side another &&
+		check_tracking_branch second main side another &&
 		git for-each-ref "--format=%(refname)" refs/remotes |
 		sed -e "/^refs\/remotes\/origin\//d" \
 		    -e "/^refs\/remotes\/second\//d" >actual &&
@@ -78,11 +78,45 @@ test_expect_success 'add another remote' '
 	)
 '
 
-test_expect_success C_LOCALE_OUTPUT 'check remote-tracking' '
+test_expect_success 'setup bare clone for server' '
+	git clone --bare "file://$(pwd)/one" srv.bare &&
+	git -C srv.bare config --local uploadpack.allowfilter 1 &&
+	git -C srv.bare config --local uploadpack.allowanysha1inwant 1
+'
+
+test_expect_success 'filters for promisor remotes are listed by git remote -v' '
+	test_when_finished "rm -rf pc" &&
+	git clone --filter=blob:none "file://$(pwd)/srv.bare" pc &&
+	git -C pc remote -v >out &&
+	grep "srv.bare (fetch) \[blob:none\]" out &&
+
+	git -C pc config remote.origin.partialCloneFilter object:type=commit &&
+	git -C pc remote -v >out &&
+	grep "srv.bare (fetch) \[object:type=commit\]" out
+'
+
+test_expect_success 'filters should not be listed for non promisor remotes (remote -v)' '
+	test_when_finished "rm -rf pc" &&
+	git clone one pc &&
+	git -C pc remote -v >out &&
+	! grep "(fetch) \[.*\]" out
+'
+
+test_expect_success 'filters are listed by git remote -v only' '
+	test_when_finished "rm -rf pc" &&
+	git clone --filter=blob:none "file://$(pwd)/srv.bare" pc &&
+	git -C pc remote >out &&
+	! grep "\[blob:none\]" out &&
+
+	git -C pc remote show >out &&
+	! grep "\[blob:none\]" out
+'
+
+test_expect_success 'check remote-tracking' '
 	(
 		cd test &&
-		check_remote_track origin master side &&
-		check_remote_track second master side another
+		check_remote_track origin main side &&
+		check_remote_track second main side another
 	)
 '
 
@@ -99,16 +133,16 @@ test_expect_success 'remote forces tracking branches' '
 test_expect_success 'remove remote' '
 	(
 		cd test &&
-		git symbolic-ref refs/remotes/second/HEAD refs/remotes/second/master &&
+		git symbolic-ref refs/remotes/second/HEAD refs/remotes/second/main &&
 		git remote rm second
 	)
 '
 
-test_expect_success C_LOCALE_OUTPUT 'remove remote' '
+test_expect_success 'remove remote' '
 	(
 		cd test &&
 		tokens_match origin "$(git remote)" &&
-		check_remote_track origin master side &&
+		check_remote_track origin main side &&
 		git for-each-ref "--format=%(refname)" refs/remotes |
 		sed -e "/^refs\/remotes\/origin\//d" >actual &&
 		test_must_be_empty actual
@@ -121,13 +155,13 @@ test_expect_success 'remove remote protects local branches' '
 		cat >expect1 <<-\EOF &&
 		Note: A branch outside the refs/remotes/ hierarchy was not removed;
 		to delete it, use:
-		  git branch -d master
+		  git branch -d main
 		EOF
 		cat >expect2 <<-\EOF &&
 		Note: Some branches outside the refs/remotes/ hierarchy were not removed;
 		to delete them, use:
 		  git branch -d foobranch
-		  git branch -d master
+		  git branch -d main
 		EOF
 		git tag footag &&
 		git config --add remote.oops.fetch "+refs/*:refs/*" &&
@@ -137,23 +171,23 @@ test_expect_success 'remove remote protects local branches' '
 		git remote rm oops 2>actual2 &&
 		git branch -d foobranch &&
 		git tag -d footag &&
-		test_i18ncmp expect1 actual1 &&
-		test_i18ncmp expect2 actual2
+		test_cmp expect1 actual1 &&
+		test_cmp expect2 actual2
 	)
 '
 
 test_expect_success 'remove errors out early when deleting non-existent branch' '
 	(
 		cd test &&
-		echo "fatal: No such remote: '\''foo'\''" >expect &&
-		test_must_fail git remote rm foo 2>actual &&
-		test_i18ncmp expect actual
+		echo "error: No such remote: '\''foo'\''" >expect &&
+		test_expect_code 2 git remote rm foo 2>actual &&
+		test_cmp expect actual
 	)
 '
 
 test_expect_success 'remove remote with a branch without configured merge' '
 	test_when_finished "(
-		git -C test checkout master;
+		git -C test checkout main;
 		git -C test branch -D two;
 		git -C test config --remove-section remote.two;
 		git -C test config --remove-section branch.second;
@@ -163,9 +197,9 @@ test_expect_success 'remove remote with a branch without configured merge' '
 		cd test &&
 		git remote add two ../two &&
 		git fetch two &&
-		git checkout -b second two/master^0 &&
+		git checkout -b second two/main^0 &&
 		git config branch.second.remote two &&
-		git checkout master &&
+		git checkout main &&
 		git remote rm two
 	)
 '
@@ -173,67 +207,100 @@ test_expect_success 'remove remote with a branch without configured merge' '
 test_expect_success 'rename errors out early when deleting non-existent branch' '
 	(
 		cd test &&
-		echo "fatal: No such remote: '\''foo'\''" >expect &&
-		test_must_fail git remote rename foo bar 2>actual &&
-		test_i18ncmp expect actual
+		echo "error: No such remote: '\''foo'\''" >expect &&
+		test_expect_code 2 git remote rename foo bar 2>actual &&
+		test_cmp expect actual
 	)
 '
 
+test_expect_success 'rename errors out early when new name is invalid' '
+	test_config remote.foo.vcs bar &&
+	echo "fatal: '\''invalid...name'\'' is not a valid remote name" >expect &&
+	test_must_fail git remote rename foo invalid...name 2>actual &&
+	test_cmp expect actual
+'
+
 test_expect_success 'add existing foreign_vcs remote' '
 	test_config remote.foo.vcs bar &&
-	echo "fatal: remote foo already exists." >expect &&
-	test_must_fail git remote add foo bar 2>actual &&
-	test_i18ncmp expect actual
+	echo "error: remote foo already exists." >expect &&
+	test_expect_code 3 git remote add foo bar 2>actual &&
+	test_cmp expect actual
 '
 
 test_expect_success 'add existing foreign_vcs remote' '
 	test_config remote.foo.vcs bar &&
 	test_config remote.bar.vcs bar &&
-	echo "fatal: remote bar already exists." >expect &&
-	test_must_fail git remote rename foo bar 2>actual &&
-	test_i18ncmp expect actual
+	echo "error: remote bar already exists." >expect &&
+	test_expect_code 3 git remote rename foo bar 2>actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'add invalid foreign_vcs remote' '
+	echo "fatal: '\''invalid...name'\'' is not a valid remote name" >expect &&
+	test_must_fail git remote add invalid...name bar 2>actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'without subcommand' '
+	echo origin >expect &&
+	git -C test remote >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'without subcommand accepts -v' '
+	cat >expect <<-EOF &&
+	origin	$(pwd)/one (fetch)
+	origin	$(pwd)/one (push)
+	EOF
+	git -C test remote -v >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'without subcommand does not take arguments' '
+	test_expect_code 129 git -C test remote origin 2>err &&
+	grep "^error: unknown subcommand:" err
 '
 
 cat >test/expect <<EOF
 * remote origin
   Fetch URL: $(pwd)/one
   Push  URL: $(pwd)/one
-  HEAD branch: master
+  HEAD branch: main
   Remote branches:
-    master new (next fetch will store in remotes/origin)
-    side   tracked
+    main new (next fetch will store in remotes/origin)
+    side tracked
   Local branches configured for 'git pull':
-    ahead    merges with remote master
-    master   merges with remote master
+    ahead    merges with remote main
+    main     merges with remote main
     octopus  merges with remote topic-a
                 and with remote topic-b
                 and with remote topic-c
-    rebase  rebases onto remote master
+    rebase  rebases onto remote main
   Local refs configured for 'git push':
-    master pushes to master   (local out of date)
-    master pushes to upstream (create)
+    main pushes to main     (local out of date)
+    main pushes to upstream (create)
 * remote two
   Fetch URL: ../two
   Push  URL: ../three
-  HEAD branch: master
+  HEAD branch: main
   Local refs configured for 'git push':
-    ahead  forces to master  (fast-forwardable)
-    master pushes to another (up to date)
+    ahead forces to main    (fast-forwardable)
+    main  pushes to another (up to date)
 EOF
 
 test_expect_success 'show' '
 	(
 		cd test &&
-		git config --add remote.origin.fetch refs/heads/master:refs/heads/upstream &&
+		git config --add remote.origin.fetch refs/heads/main:refs/heads/upstream &&
 		git fetch &&
-		git checkout -b ahead origin/master &&
+		git checkout -b ahead origin/main &&
 		echo 1 >>file &&
 		test_tick &&
 		git commit -m update file &&
-		git checkout master &&
-		git branch --track octopus origin/master &&
-		git branch --track rebase origin/master &&
-		git branch -d -r origin/master &&
+		git checkout main &&
+		git branch --track octopus origin/main &&
+		git branch --track rebase origin/main &&
+		git branch -d -r origin/main &&
 		git config --add remote.two.url ../two &&
 		git config --add remote.two.pushurl ../three &&
 		git config branch.rebase.rebase true &&
@@ -245,30 +312,76 @@ test_expect_success 'show' '
 			git commit -m update file
 		) &&
 		git config --add remote.origin.push : &&
-		git config --add remote.origin.push refs/heads/master:refs/heads/upstream &&
+		git config --add remote.origin.push refs/heads/main:refs/heads/upstream &&
 		git config --add remote.origin.push +refs/tags/lastbackup &&
-		git config --add remote.two.push +refs/heads/ahead:refs/heads/master &&
-		git config --add remote.two.push refs/heads/master:refs/heads/another &&
+		git config --add remote.two.push +refs/heads/ahead:refs/heads/main &&
+		git config --add remote.two.push refs/heads/main:refs/heads/another &&
 		git remote show origin two >output &&
 		git branch -d rebase octopus &&
-		test_i18ncmp expect output
+		test_cmp expect output
 	)
 '
 
+cat >expect <<EOF
+* remote origin
+  Fetch URL: $(pwd)/one
+  Push  URL: $(pwd)/one
+  HEAD branch: main
+  Remote branches:
+    main skipped
+    side tracked
+  Local branches configured for 'git pull':
+    ahead merges with remote main
+    main  merges with remote main
+  Local refs configured for 'git push':
+    main pushes to main     (local out of date)
+    main pushes to upstream (create)
+EOF
+
+test_expect_success 'show with negative refspecs' '
+	test_when_finished "git -C test config --unset-all --fixed-value remote.origin.fetch ^refs/heads/main" &&
+	git -C test config --add remote.origin.fetch ^refs/heads/main &&
+	git -C test remote show origin >output &&
+	test_cmp expect output
+'
+
+cat >expect <<EOF
+* remote origin
+  Fetch URL: $(pwd)/one
+  Push  URL: $(pwd)/one
+  HEAD branch: main
+  Remote branches:
+    main new (next fetch will store in remotes/origin)
+    side stale (use 'git remote prune' to remove)
+  Local branches configured for 'git pull':
+    ahead merges with remote main
+    main  merges with remote main
+  Local refs configured for 'git push':
+    main pushes to main     (local out of date)
+    main pushes to upstream (create)
+EOF
+
+test_expect_failure 'show stale with negative refspecs' '
+	test_when_finished "git -C test config --unset-all --fixed-value remote.origin.fetch ^refs/heads/side" &&
+	git -C test config --add remote.origin.fetch ^refs/heads/side &&
+	git -C test remote show origin >output &&
+	test_cmp expect output
+'
+
 cat >test/expect <<EOF
 * remote origin
   Fetch URL: $(pwd)/one
   Push  URL: $(pwd)/one
   HEAD branch: (not queried)
   Remote branches: (status not queried)
-    master
+    main
     side
   Local branches configured for 'git pull':
-    ahead  merges with remote master
-    master merges with remote master
+    ahead merges with remote main
+    main  merges with remote main
   Local refs configured for 'git push' (status not queried):
     (matching)           pushes to (matching)
-    refs/heads/master    pushes to refs/heads/upstream
+    refs/heads/main      pushes to refs/heads/upstream
     refs/tags/lastbackup forces to refs/tags/lastbackup
 EOF
 
@@ -278,7 +391,7 @@ test_expect_success 'show -n' '
 		cd test &&
 		git remote show -n origin >output &&
 		mv ../one.unreachable ../one &&
-		test_i18ncmp expect output
+		test_cmp expect output
 	)
 '
 
@@ -309,7 +422,7 @@ test_expect_success 'set-head --auto' '
 	(
 		cd test &&
 		git remote set-head --auto origin &&
-		echo refs/remotes/origin/master >expect &&
+		echo refs/remotes/origin/main >expect &&
 		git symbolic-ref refs/remotes/origin/HEAD >output &&
 		test_cmp expect output
 	)
@@ -320,8 +433,8 @@ test_expect_success 'set-head --auto has no problem w/multiple HEADs' '
 		cd test &&
 		git fetch two "refs/heads/*:refs/remotes/two/*" &&
 		git remote set-head --auto two >output 2>&1 &&
-		echo "two/HEAD set to master" >expect &&
-		test_i18ncmp expect output
+		echo "two/HEAD set to main" >expect &&
+		test_cmp expect output
 	)
 '
 
@@ -334,7 +447,7 @@ test_expect_success 'set-head explicit' '
 		cd test &&
 		git remote set-head origin side2 &&
 		git symbolic-ref refs/remotes/origin/HEAD >output &&
-		git remote set-head origin master &&
+		git remote set-head origin main &&
 		test_cmp expect output
 	)
 '
@@ -353,7 +466,7 @@ test_expect_success 'prune --dry-run' '
 		git remote prune --dry-run origin >output &&
 		git rev-parse refs/remotes/origin/side2 &&
 		test_must_fail git rev-parse refs/remotes/origin/side &&
-		test_i18ncmp expect output
+		test_cmp expect output
 	)
 '
 
@@ -381,7 +494,7 @@ test_expect_success 'add --mirror && prune' '
 
 test_expect_success 'add --mirror=fetch' '
 	mkdir mirror-fetch &&
-	git init mirror-fetch/parent &&
+	git init -b main mirror-fetch/parent &&
 	(
 		cd mirror-fetch/parent &&
 		test_commit one
@@ -397,7 +510,7 @@ test_expect_success 'fetch mirrors act as mirrors during fetch' '
 	(
 		cd mirror-fetch/parent &&
 		git branch new &&
-		git branch -m master renamed
+		git branch -m main renamed
 	) &&
 	(
 		cd mirror-fetch/child &&
@@ -411,7 +524,7 @@ test_expect_success 'fetch mirrors can prune' '
 	(
 		cd mirror-fetch/child &&
 		git remote prune parent &&
-		test_must_fail git rev-parse --verify refs/heads/master
+		test_must_fail git rev-parse --verify refs/heads/main
 	)
 '
 
@@ -452,7 +565,7 @@ test_expect_success 'fetch mirror respects specific branches' '
 test_expect_success 'add --mirror=push' '
 	mkdir mirror-push &&
 	git init --bare mirror-push/public &&
-	git init mirror-push/private &&
+	git init -b main mirror-push/private &&
 	(
 		cd mirror-push/private &&
 		test_commit one &&
@@ -464,14 +577,14 @@ test_expect_success 'push mirrors act as mirrors during push' '
 	(
 		cd mirror-push/private &&
 		git branch new &&
-		git branch -m master renamed &&
+		git branch -m main renamed &&
 		git push public
 	) &&
 	(
 		cd mirror-push/private &&
 		git rev-parse --verify refs/heads/new &&
 		git rev-parse --verify refs/heads/renamed &&
-		test_must_fail git rev-parse --verify refs/heads/master
+		test_must_fail git rev-parse --verify refs/heads/main
 	)
 '
 
@@ -578,6 +691,7 @@ test_expect_success 'add --no-tags' '
 		cd add-no-tags &&
 		git init &&
 		git remote add -f --no-tags origin ../one &&
+		grep tagOpt .git/config &&
 		git tag -l some-tag >../test/output &&
 		git tag -l foobar-tag >../test/output &&
 		git config remote.origin.tagopt >>../test/output
@@ -597,10 +711,10 @@ test_expect_success 'reject --no-no-tags' '
 '
 
 cat >one/expect <<\EOF
-  apis/master
+  apis/main
   apis/side
   drosophila/another
-  drosophila/master
+  drosophila/main
   drosophila/side
 EOF
 
@@ -617,11 +731,11 @@ test_expect_success 'update' '
 
 cat >one/expect <<\EOF
   drosophila/another
-  drosophila/master
+  drosophila/main
   drosophila/side
-  manduca/master
+  manduca/main
   manduca/side
-  megaloprepus/master
+  megaloprepus/main
   megaloprepus/side
 EOF
 
@@ -660,11 +774,11 @@ test_expect_success 'update --prune' '
 '
 
 cat >one/expect <<-\EOF
-  apis/master
+  apis/main
   apis/side
-  manduca/master
+  manduca/main
   manduca/side
-  megaloprepus/master
+  megaloprepus/main
   megaloprepus/side
 EOF
 
@@ -684,7 +798,7 @@ test_expect_success 'update default' '
 
 cat >one/expect <<\EOF
   drosophila/another
-  drosophila/master
+  drosophila/main
   drosophila/side
 EOF
 
@@ -738,14 +852,17 @@ test_expect_success 'rename a remote' '
 	git clone one four &&
 	(
 		cd four &&
-		git config branch.master.pushRemote origin &&
-		git remote rename origin upstream &&
+		git config branch.main.pushRemote origin &&
+		GIT_TRACE2_EVENT=$(pwd)/trace \
+			git remote rename --progress origin upstream &&
+		test_region progress "Renaming remote references" trace &&
+		grep "pushRemote" .git/config &&
 		test -z "$(git for-each-ref refs/remotes/origin)" &&
-		test "$(git symbolic-ref refs/remotes/upstream/HEAD)" = "refs/remotes/upstream/master" &&
-		test "$(git rev-parse upstream/master)" = "$(git rev-parse master)" &&
+		test "$(git symbolic-ref refs/remotes/upstream/HEAD)" = "refs/remotes/upstream/main" &&
+		test "$(git rev-parse upstream/main)" = "$(git rev-parse main)" &&
 		test "$(git config remote.upstream.fetch)" = "+refs/heads/*:refs/remotes/upstream/*" &&
-		test "$(git config branch.master.remote)" = "upstream" &&
-		test "$(git config branch.master.pushRemote)" = "upstream" &&
+		test "$(git config branch.main.remote)" = "upstream" &&
+		test "$(git config branch.main.pushRemote)" = "upstream" &&
 		test "$(git config --global remote.pushDefault)" = "origin"
 	)
 '
@@ -756,6 +873,7 @@ test_expect_success 'rename a remote renames repo remote.pushDefault' '
 		cd four.1 &&
 		git config remote.pushDefault origin &&
 		git remote rename origin upstream &&
+		grep pushDefault .git/config &&
 		test "$(git config --local remote.pushDefault)" = "upstream"
 	)
 '
@@ -784,6 +902,17 @@ test_expect_success 'rename a remote renames repo remote.pushDefault but keeps g
 	)
 '
 
+test_expect_success 'rename handles remote without fetch refspec' '
+	git clone --bare one no-refspec.git &&
+	# confirm assumption that bare clone does not create refspec
+	test_expect_code 5 \
+		git -C no-refspec.git config --unset-all remote.origin.fetch &&
+	git -C no-refspec.git config remote.origin.url >expect &&
+	git -C no-refspec.git remote rename origin foo &&
+	git -C no-refspec.git config remote.foo.url >actual &&
+	test_cmp expect actual
+'
+
 test_expect_success 'rename does not update a non-default fetch refspec' '
 	git clone one four.one &&
 	(
@@ -791,7 +920,7 @@ test_expect_success 'rename does not update a non-default fetch refspec' '
 		git config remote.origin.fetch +refs/heads/*:refs/heads/origin/* &&
 		git remote rename origin upstream &&
 		test "$(git config remote.upstream.fetch)" = "+refs/heads/*:refs/heads/origin/*" &&
-		git rev-parse -q origin/master
+		git rev-parse -q origin/main
 	)
 '
 
@@ -811,7 +940,7 @@ test_expect_success 'rename a remote with name prefix of other remote' '
 		cd four.three &&
 		git remote add o git://example.com/repo.git &&
 		git remote rename o upstream &&
-		test "$(git rev-parse origin/master)" = "$(git rev-parse master)"
+		test "$(git rev-parse origin/main)" = "$(git rev-parse main)"
 	)
 '
 
@@ -827,11 +956,11 @@ test_expect_success 'remove a remote' '
 	git clone one four.five &&
 	(
 		cd four.five &&
-		git config branch.master.pushRemote origin &&
+		git config branch.main.pushRemote origin &&
 		git remote remove origin &&
 		test -z "$(git for-each-ref refs/remotes/origin)" &&
-		test_must_fail git config branch.master.remote &&
-		test_must_fail git config branch.master.pushRemote &&
+		test_must_fail git config branch.main.remote &&
+		test_must_fail git config branch.main.pushRemote &&
 		test "$(git config --global remote.pushDefault)" = "origin"
 	)
 '
@@ -872,9 +1001,9 @@ test_expect_success 'remove a remote removes repo remote.pushDefault but keeps g
 
 cat >remotes_origin <<EOF
 URL: $(pwd)/one
-Push: refs/heads/master:refs/heads/upstream
+Push: refs/heads/main:refs/heads/upstream
 Push: refs/heads/next:refs/heads/upstream2
-Pull: refs/heads/master:refs/heads/origin
+Pull: refs/heads/main:refs/heads/origin
 Pull: refs/heads/next:refs/heads/origin2
 EOF
 
@@ -890,11 +1019,11 @@ test_expect_success 'migrate a remote from named file in $GIT_DIR/remotes' '
 		test_path_is_missing .git/remotes/origin &&
 		test "$(git config remote.origin.url)" = "$origin_url" &&
 		cat >push_expected <<-\EOF &&
-		refs/heads/master:refs/heads/upstream
+		refs/heads/main:refs/heads/upstream
 		refs/heads/next:refs/heads/upstream2
 		EOF
 		cat >fetch_expected <<-\EOF &&
-		refs/heads/master:refs/heads/origin
+		refs/heads/main:refs/heads/origin
 		refs/heads/next:refs/heads/origin2
 		EOF
 		git config --get-all remote.origin.push >push_actual &&
@@ -905,25 +1034,27 @@ test_expect_success 'migrate a remote from named file in $GIT_DIR/remotes' '
 '
 
 test_expect_success 'migrate a remote from named file in $GIT_DIR/branches' '
-	git clone one six &&
+	git clone --template= one six &&
 	origin_url=$(pwd)/one &&
 	(
 		cd six &&
 		git remote rm origin &&
-		echo "$origin_url" >.git/branches/origin &&
+		mkdir .git/branches &&
+		echo "$origin_url#main" >.git/branches/origin &&
 		git remote rename origin origin &&
 		test_path_is_missing .git/branches/origin &&
 		test "$(git config remote.origin.url)" = "$origin_url" &&
-		test "$(git config remote.origin.fetch)" = "refs/heads/master:refs/heads/origin" &&
-		test "$(git config remote.origin.push)" = "HEAD:refs/heads/master"
+		test "$(git config remote.origin.fetch)" = "refs/heads/main:refs/heads/origin" &&
+		test "$(git config remote.origin.push)" = "HEAD:refs/heads/main"
 	)
 '
 
 test_expect_success 'migrate a remote from named file in $GIT_DIR/branches (2)' '
-	git clone one seven &&
+	git clone --template= one seven &&
 	(
 		cd seven &&
 		git remote rm origin &&
+		mkdir .git/branches &&
 		echo "quux#foom" > .git/branches/origin &&
 		git remote rename origin origin &&
 		test_path_is_missing .git/branches/origin &&
@@ -938,13 +1069,13 @@ test_expect_success 'remote prune to cause a dangling symref' '
 	(
 		cd one &&
 		git checkout side2 &&
-		git branch -D master
+		git branch -D main
 	) &&
 	(
 		cd eight &&
 		git remote prune origin
 	) >err 2>&1 &&
-	test_i18ngrep "has become dangling" err &&
+	test_grep "has become dangling" err &&
 
 	: And the dangling symref will not cause other annoying errors &&
 	(
@@ -956,7 +1087,7 @@ test_expect_success 'remote prune to cause a dangling symref' '
 		cd eight &&
 		test_must_fail git branch nomore origin
 	) 2>err &&
-	test_i18ngrep "dangling symref" err
+	test_grep "dangling symref" err
 '
 
 test_expect_success 'show empty remote' '
@@ -981,22 +1112,22 @@ test_expect_success 'remote set-branches' '
 	EOF
 	sort <<-\EOF >expect.replace &&
 	+refs/heads/maint:refs/remotes/scratch/maint
-	+refs/heads/master:refs/remotes/scratch/master
+	+refs/heads/main:refs/remotes/scratch/main
 	+refs/heads/next:refs/remotes/scratch/next
 	EOF
 	sort <<-\EOF >expect.add-two &&
 	+refs/heads/maint:refs/remotes/scratch/maint
-	+refs/heads/master:refs/remotes/scratch/master
+	+refs/heads/main:refs/remotes/scratch/main
 	+refs/heads/next:refs/remotes/scratch/next
 	+refs/heads/seen:refs/remotes/scratch/seen
 	+refs/heads/t/topic:refs/remotes/scratch/t/topic
 	EOF
 	sort <<-\EOF >expect.setup-ffonly &&
-	refs/heads/master:refs/remotes/scratch/master
+	refs/heads/main:refs/remotes/scratch/main
 	+refs/heads/next:refs/remotes/scratch/next
 	EOF
 	sort <<-\EOF >expect.respect-ffonly &&
-	refs/heads/master:refs/remotes/scratch/master
+	refs/heads/main:refs/remotes/scratch/main
 	+refs/heads/next:refs/remotes/scratch/next
 	+refs/heads/seen:refs/remotes/scratch/seen
 	EOF
@@ -1012,7 +1143,7 @@ test_expect_success 'remote set-branches' '
 		git config --get-all remote.scratch.fetch >config-result &&
 		sort <config-result >../actual.add &&
 
-		git remote set-branches scratch maint master next &&
+		git remote set-branches scratch maint main next &&
 		git config --get-all remote.scratch.fetch >config-result &&
 		sort <config-result >../actual.replace &&
 
@@ -1022,7 +1153,7 @@ test_expect_success 'remote set-branches' '
 
 		git config --unset-all remote.scratch.fetch &&
 		git config remote.scratch.fetch \
-			refs/heads/master:refs/remotes/scratch/master &&
+			refs/heads/main:refs/remotes/scratch/main &&
 		git config --add remote.scratch.fetch \
 			+refs/heads/next:refs/remotes/scratch/next &&
 		git config --get-all remote.scratch.fetch >config-result &&
@@ -1042,14 +1173,14 @@ test_expect_success 'remote set-branches' '
 
 test_expect_success 'remote set-branches with --mirror' '
 	echo "+refs/*:refs/*" >expect.initial &&
-	echo "+refs/heads/master:refs/heads/master" >expect.replace &&
+	echo "+refs/heads/main:refs/heads/main" >expect.replace &&
 	git clone --mirror .git/ setbranches-mirror &&
 	(
 		cd setbranches-mirror &&
 		git remote rename origin scratch &&
 		git config --get-all remote.scratch.fetch >../actual.initial &&
 
-		git remote set-branches scratch heads/master &&
+		git remote set-branches scratch heads/main &&
 		git config --get-all remote.scratch.fetch >../actual.replace
 	) &&
 	test_cmp expect.initial actual.initial &&
@@ -1288,14 +1419,14 @@ test_expect_success 'extra args: setup' '
 test_extra_arg () {
 	test_expect_success "extra args: $*" "
 		test_must_fail git remote $* bogus_extra_arg 2>actual &&
-		test_i18ngrep '^usage:' actual
+		test_grep '^usage:' actual
 	"
 }
 
 test_extra_arg add nick url
 test_extra_arg rename origin newname
 test_extra_arg remove origin
-test_extra_arg set-head origin master
+test_extra_arg set-head origin main
 # set-branches takes any number of args
 test_extra_arg get-url origin newurl
 test_extra_arg set-url origin newurl oldurl
@@ -1312,8 +1443,7 @@ test_expect_success 'unqualified <dst> refspec DWIM and advice' '
 	test_when_finished "(cd test && git tag -d some-tag)" &&
 	(
 		cd test &&
-		git tag -a -m "Some tag" some-tag master &&
-		exit_with=true &&
+		git tag -a -m "Some tag" some-tag main &&
 		for type in commit tag tree blob
 		do
 			if test "$type" = "blob"
@@ -1323,22 +1453,21 @@ test_expect_success 'unqualified <dst> refspec DWIM and advice' '
 				oid=$(git rev-parse some-tag^{$type})
 			fi &&
 			test_must_fail git push origin $oid:dst 2>err &&
-			test_i18ngrep "error: The destination you" err &&
-			test_i18ngrep "hint: Did you mean" err &&
+			test_grep "error: The destination you" err &&
+			test_grep "hint: Did you mean" err &&
 			test_must_fail git -c advice.pushUnqualifiedRefName=false \
 				push origin $oid:dst 2>err &&
-			test_i18ngrep "error: The destination you" err &&
-			test_i18ngrep ! "hint: Did you mean" err ||
-			exit_with=false
-		done &&
-		$exit_with
+			test_grep "error: The destination you" err &&
+			test_grep ! "hint: Did you mean" err ||
+			exit 1
+		done
 	)
 '
 
 test_expect_success 'refs/remotes/* <src> refspec and unqualified <dst> DWIM and advice' '
 	(
 		cd two &&
-		git tag -a -m "Some tag" my-tag master &&
+		git tag -a -m "Some tag" my-tag main &&
 		git update-ref refs/trees/my-head-tree HEAD^{tree} &&
 		git update-ref refs/blobs/my-file-blob HEAD:file
 	) &&
@@ -1350,16 +1479,16 @@ test_expect_success 'refs/remotes/* <src> refspec and unqualified <dst> DWIM and
 		git fetch --no-tags two &&
 
 		test_must_fail git push origin refs/remotes/two/another:dst 2>err &&
-		test_i18ngrep "error: The destination you" err &&
+		test_grep "error: The destination you" err &&
 
 		test_must_fail git push origin refs/remotes/tags-from-two/my-tag:dst-tag 2>err &&
-		test_i18ngrep "error: The destination you" err &&
+		test_grep "error: The destination you" err &&
 
 		test_must_fail git push origin refs/remotes/trees-from-two/my-head-tree:dst-tree 2>err &&
-		test_i18ngrep "error: The destination you" err &&
+		test_grep "error: The destination you" err &&
 
 		test_must_fail git push origin refs/remotes/blobs-from-two/my-file-blob:dst-blob 2>err &&
-		test_i18ngrep "error: The destination you" err
+		test_grep "error: The destination you" err
 	)
 '
 
diff --git a/t/t5506-remote-groups.sh b/t/t5506-remote-groups.sh
index 83d5558..0e17617 100755
--- a/t/t5506-remote-groups.sh
+++ b/t/t5506-remote-groups.sh
@@ -1,6 +1,10 @@
 #!/bin/sh
 
 test_description='git remote group handling'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 mark() {
@@ -31,8 +35,8 @@ repo_fetched() {
 test_expect_success 'setup' '
 	mkdir one && (cd one && git init) &&
 	mkdir two && (cd two && git init) &&
-	git remote add -m master one one &&
-	git remote add -m master two two
+	git remote add -m main one one &&
+	git remote add -m main two two
 '
 
 test_expect_success 'no group updates all' '
@@ -95,4 +99,13 @@ test_expect_success 'updating remote name updates that remote' '
 	! repo_fetched two
 '
 
+test_expect_success 'updating group in parallel with a duplicate remote does not fail (fetch)' '
+	mark fetch-group-duplicate &&
+	update_repo one &&
+	git config --add remotes.duplicate one &&
+	git config --add remotes.duplicate one &&
+	git -c fetch.parallel=2 remote update duplicate &&
+	repo_fetched one
+'
+
 test_done
diff --git a/t/t5507-remote-environment.sh b/t/t5507-remote-environment.sh
index e614929..c6a6957 100755
--- a/t/t5507-remote-environment.sh
+++ b/t/t5507-remote-environment.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='check environment showed to remote side of transports'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'set up "remote" push situation' '
diff --git a/t/t5509-fetch-push-namespaces.sh b/t/t5509-fetch-push-namespaces.sh
index a67f792..31553b4 100755
--- a/t/t5509-fetch-push-namespaces.sh
+++ b/t/t5509-fetch-push-namespaces.sh
@@ -1,6 +1,9 @@
 #!/bin/sh
 
 test_description='fetch/push involving ref namespaces'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -27,9 +30,9 @@ test_expect_success setup '
 test_expect_success 'pushing into a repository using a ref namespace' '
 	(
 		cd original &&
-		git push pushee-namespaced master &&
+		git push pushee-namespaced main &&
 		git ls-remote pushee-namespaced >actual &&
-		printf "$commit1\trefs/heads/master\n" >expected &&
+		printf "$commit1\trefs/heads/main\n" >expected &&
 		test_cmp expected actual &&
 		git push pushee-namespaced --tags &&
 		git ls-remote pushee-namespaced >actual &&
@@ -56,7 +59,7 @@ test_expect_success 'pulling from a repository using a ref namespace' '
 		cd puller &&
 		git remote add -f pushee-namespaced "ext::git --namespace=namespace %s ../pushee" &&
 		git for-each-ref refs/ >actual &&
-		printf "$commit1 commit\trefs/remotes/pushee-namespaced/master\n" >expected &&
+		printf "$commit1 commit\trefs/remotes/pushee-namespaced/main\n" >expected &&
 		printf "$commit0 commit\trefs/tags/0\n" >>expected &&
 		printf "$commit1 commit\trefs/tags/1\n" >>expected &&
 		test_cmp expected actual
@@ -76,7 +79,7 @@ test_expect_success 'mirroring a repository using a ref namespace' '
 	(
 		cd mirror &&
 		git for-each-ref refs/ >actual &&
-		printf "$commit1 commit\trefs/namespaces/namespace/refs/heads/master\n" >expected &&
+		printf "$commit1 commit\trefs/namespaces/namespace/refs/heads/main\n" >expected &&
 		printf "$commit0 commit\trefs/namespaces/namespace/refs/tags/0\n" >>expected &&
 		printf "$commit1 commit\trefs/namespaces/namespace/refs/tags/1\n" >>expected &&
 		test_cmp expected actual
@@ -87,7 +90,7 @@ test_expect_success 'hide namespaced refs with transfer.hideRefs' '
 	GIT_NAMESPACE=namespace \
 		git -C pushee -c transfer.hideRefs=refs/tags \
 		ls-remote "ext::git %s ." >actual &&
-	printf "$commit1\trefs/heads/master\n" >expected &&
+	printf "$commit1\trefs/heads/main\n" >expected &&
 	test_cmp expected actual
 '
 
@@ -95,7 +98,7 @@ test_expect_success 'check that transfer.hideRefs does not match unstripped refs
 	GIT_NAMESPACE=namespace \
 		git -C pushee -c transfer.hideRefs=refs/namespaces/namespace/refs/tags \
 		ls-remote "ext::git %s ." >actual &&
-	printf "$commit1\trefs/heads/master\n" >expected &&
+	printf "$commit1\trefs/heads/main\n" >expected &&
 	printf "$commit0\trefs/tags/0\n" >>expected &&
 	printf "$commit1\trefs/tags/1\n" >>expected &&
 	test_cmp expected actual
@@ -105,23 +108,23 @@ test_expect_success 'hide full refs with transfer.hideRefs' '
 	GIT_NAMESPACE=namespace \
 		git -C pushee -c transfer.hideRefs="^refs/namespaces/namespace/refs/tags" \
 		ls-remote "ext::git %s ." >actual &&
-	printf "$commit1\trefs/heads/master\n" >expected &&
+	printf "$commit1\trefs/heads/main\n" >expected &&
 	test_cmp expected actual
 '
 
 test_expect_success 'try to update a hidden ref' '
-	test_config -C pushee transfer.hideRefs refs/heads/master &&
-	test_must_fail git -C original push pushee-namespaced master
+	test_config -C pushee transfer.hideRefs refs/heads/main &&
+	test_must_fail git -C original push pushee-namespaced main
 '
 
 test_expect_success 'try to update a ref that is not hidden' '
-	test_config -C pushee transfer.hideRefs refs/namespaces/namespace/refs/heads/master &&
-	git -C original push pushee-namespaced master
+	test_config -C pushee transfer.hideRefs refs/namespaces/namespace/refs/heads/main &&
+	git -C original push pushee-namespaced main
 '
 
 test_expect_success 'try to update a hidden full ref' '
-	test_config -C pushee transfer.hideRefs "^refs/namespaces/namespace/refs/heads/master" &&
-	test_must_fail git -C original push pushee-namespaced master
+	test_config -C pushee transfer.hideRefs "^refs/namespaces/namespace/refs/heads/main" &&
+	test_must_fail git -C original push pushee-namespaced main
 '
 
 test_expect_success 'set up ambiguous HEAD' '
@@ -157,9 +160,9 @@ test_expect_success 'denyCurrentBranch and unborn branch with ref namespace' '
 		cd original &&
 		git init unborn &&
 		git remote add unborn-namespaced "ext::git --namespace=namespace %s unborn" &&
-		test_must_fail git push unborn-namespaced HEAD:master &&
+		test_must_fail git push unborn-namespaced HEAD:main &&
 		git -C unborn config receive.denyCurrentBranch updateInstead &&
-		git push unborn-namespaced HEAD:master
+		git push unborn-namespaced HEAD:main
 	)
 '
 
diff --git a/t/t5510-fetch.sh b/t/t5510-fetch.sh
index 25695df..33d34d5 100755
--- a/t/t5510-fetch.sh
+++ b/t/t5510-fetch.sh
@@ -6,26 +6,16 @@ test_description='Per branch config variables affects "git fetch".
 '
 
 . ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-bundle.sh
 
 D=$(pwd)
 
-test_bundle_object_count () {
-	git verify-pack -v "$1" >verify.out &&
-	test "$2" = $(grep "^$OID_REGEX " verify.out | wc -l)
-}
-
-convert_bundle_to_pack () {
-	while read x && test -n "$x"
-	do
-		:;
-	done
-	cat
-}
-
 test_expect_success setup '
 	echo >file original &&
 	git add file &&
-	git commit -a -m original'
+	git commit -a -m original &&
+	git branch -M main
+'
 
 test_expect_success "clone and setup child repos" '
 	git clone . one &&
@@ -37,21 +27,21 @@ test_expect_success "clone and setup child repos" '
 	git clone . two &&
 	(
 		cd two &&
-		git config branch.master.remote one &&
+		git config branch.main.remote one &&
 		git config remote.one.url ../one/.git/ &&
-		git config remote.one.fetch refs/heads/master:refs/heads/one
+		git config remote.one.fetch refs/heads/main:refs/heads/one
 	) &&
 	git clone . three &&
 	(
 		cd three &&
-		git config branch.master.remote two &&
-		git config branch.master.merge refs/heads/one &&
+		git config branch.main.remote two &&
+		git config branch.main.merge refs/heads/one &&
 		mkdir -p .git/remotes &&
-		{
-			echo "URL: ../two/.git/"
-			echo "Pull: refs/heads/master:refs/heads/two"
-			echo "Pull: refs/heads/one:refs/heads/one"
-		} >.git/remotes/two
+		cat >.git/remotes/two <<-\EOF
+		URL: ../two/.git/
+		Pull: refs/heads/main:refs/heads/two
+		Pull: refs/heads/one:refs/heads/one
+		EOF
 	) &&
 	git clone . bundle &&
 	git clone . seven
@@ -65,7 +55,7 @@ test_expect_success "fetch test" '
 	git fetch &&
 	git rev-parse --verify refs/heads/one &&
 	mine=$(git rev-parse refs/heads/one) &&
-	his=$(cd ../one && git rev-parse refs/heads/master) &&
+	his=$(cd ../one && git rev-parse refs/heads/main) &&
 	test "z$mine" = "z$his"
 '
 
@@ -75,11 +65,11 @@ test_expect_success "fetch test for-merge" '
 	git fetch &&
 	git rev-parse --verify refs/heads/two &&
 	git rev-parse --verify refs/heads/one &&
-	master_in_two=$(cd ../two && git rev-parse master) &&
+	main_in_two=$(cd ../two && git rev-parse main) &&
 	one_in_two=$(cd ../two && git rev-parse one) &&
 	{
-		echo "$one_in_two	"
-		echo "$master_in_two	not-for-merge"
+		echo "$one_in_two	" &&
+		echo "$main_in_two	not-for-merge"
 	} >expected &&
 	cut -f -2 .git/FETCH_HEAD >actual &&
 	test_cmp expected actual'
@@ -88,7 +78,7 @@ test_expect_success 'fetch --prune on its own works as expected' '
 	cd "$D" &&
 	git clone . prune &&
 	cd prune &&
-	git update-ref refs/remotes/origin/extrabranch master &&
+	git update-ref refs/remotes/origin/extrabranch main &&
 
 	git fetch --prune origin &&
 	test_must_fail git rev-parse origin/extrabranch
@@ -98,9 +88,9 @@ test_expect_success 'fetch --prune with a branch name keeps branches' '
 	cd "$D" &&
 	git clone . prune-branch &&
 	cd prune-branch &&
-	git update-ref refs/remotes/origin/extrabranch master &&
+	git update-ref refs/remotes/origin/extrabranch main &&
 
-	git fetch --prune origin master &&
+	git fetch --prune origin main &&
 	git rev-parse origin/extrabranch
 '
 
@@ -110,18 +100,18 @@ test_expect_success 'fetch --prune with a namespace keeps other namespaces' '
 	cd prune-namespace &&
 
 	git fetch --prune origin refs/heads/a/*:refs/remotes/origin/a/* &&
-	git rev-parse origin/master
+	git rev-parse origin/main
 '
 
 test_expect_success 'fetch --prune handles overlapping refspecs' '
 	cd "$D" &&
-	git update-ref refs/pull/42/head master &&
+	git update-ref refs/pull/42/head main &&
 	git clone . prune-overlapping &&
 	cd prune-overlapping &&
 	git config --add remote.origin.fetch refs/pull/*/head:refs/remotes/origin/pr/* &&
 
 	git fetch --prune origin &&
-	git rev-parse origin/master &&
+	git rev-parse origin/main &&
 	git rev-parse origin/pr/42 &&
 
 	git config --unset-all remote.origin.fetch &&
@@ -129,7 +119,7 @@ test_expect_success 'fetch --prune handles overlapping refspecs' '
 	git config --add remote.origin.fetch refs/heads/*:refs/remotes/origin/* &&
 
 	git fetch --prune origin &&
-	git rev-parse origin/master &&
+	git rev-parse origin/main &&
 	git rev-parse origin/pr/42
 '
 
@@ -137,13 +127,13 @@ test_expect_success 'fetch --prune --tags prunes branches but not tags' '
 	cd "$D" &&
 	git clone . prune-tags &&
 	cd prune-tags &&
-	git tag sometag master &&
+	git tag sometag main &&
 	# Create what looks like a remote-tracking branch from an earlier
 	# fetch that has since been deleted from the remote:
-	git update-ref refs/remotes/origin/fake-remote master &&
+	git update-ref refs/remotes/origin/fake-remote main &&
 
 	git fetch --prune --tags origin &&
-	git rev-parse origin/master &&
+	git rev-parse origin/main &&
 	test_must_fail git rev-parse origin/fake-remote &&
 	git rev-parse sometag
 '
@@ -152,10 +142,10 @@ test_expect_success 'fetch --prune --tags with branch does not prune other thing
 	cd "$D" &&
 	git clone . prune-tags-branch &&
 	cd prune-tags-branch &&
-	git tag sometag master &&
-	git update-ref refs/remotes/origin/extrabranch master &&
+	git tag sometag main &&
+	git update-ref refs/remotes/origin/extrabranch main &&
 
-	git fetch --prune --tags origin master &&
+	git fetch --prune --tags origin main &&
 	git rev-parse origin/extrabranch &&
 	git rev-parse sometag
 '
@@ -164,9 +154,9 @@ test_expect_success 'fetch --prune --tags with refspec prunes based on refspec'
 	cd "$D" &&
 	git clone . prune-tags-refspec &&
 	cd prune-tags-refspec &&
-	git tag sometag master &&
-	git update-ref refs/remotes/origin/foo/otherbranch master &&
-	git update-ref refs/remotes/origin/extrabranch master &&
+	git tag sometag main &&
+	git update-ref refs/remotes/origin/foo/otherbranch main &&
+	git update-ref refs/remotes/origin/extrabranch main &&
 
 	git fetch --prune --tags origin refs/heads/foo/*:refs/remotes/origin/foo/* &&
 	test_must_fail git rev-parse refs/remotes/origin/foo/otherbranch &&
@@ -174,23 +164,203 @@ test_expect_success 'fetch --prune --tags with refspec prunes based on refspec'
 	git rev-parse sometag
 '
 
+test_expect_success REFFILES 'fetch --prune fails to delete branches' '
+	cd "$D" &&
+	git clone . prune-fail &&
+	cd prune-fail &&
+	git update-ref refs/remotes/origin/extrabranch main &&
+	git pack-refs --all &&
+	: this will prevent --prune from locking packed-refs for deleting refs, but adding loose refs still succeeds  &&
+	>.git/packed-refs.new &&
+
+	test_must_fail git fetch --prune origin
+'
+
+test_expect_success 'fetch --atomic works with a single branch' '
+	test_when_finished "rm -rf \"$D\"/atomic" &&
+
+	cd "$D" &&
+	git clone . atomic &&
+	git branch atomic-branch &&
+	oid=$(git rev-parse atomic-branch) &&
+	echo "$oid" >expected &&
+
+	git -C atomic fetch --atomic origin &&
+	git -C atomic rev-parse origin/atomic-branch >actual &&
+	test_cmp expected actual &&
+	test $oid = "$(git -C atomic rev-parse --verify FETCH_HEAD)"
+'
+
+test_expect_success 'fetch --atomic works with multiple branches' '
+	test_when_finished "rm -rf \"$D\"/atomic" &&
+
+	cd "$D" &&
+	git clone . atomic &&
+	git branch atomic-branch-1 &&
+	git branch atomic-branch-2 &&
+	git branch atomic-branch-3 &&
+	git rev-parse refs/heads/atomic-branch-1 refs/heads/atomic-branch-2 refs/heads/atomic-branch-3 >actual &&
+
+	git -C atomic fetch --atomic origin &&
+	git -C atomic rev-parse refs/remotes/origin/atomic-branch-1 refs/remotes/origin/atomic-branch-2 refs/remotes/origin/atomic-branch-3 >expected &&
+	test_cmp expected actual
+'
+
+test_expect_success 'fetch --atomic works with mixed branches and tags' '
+	test_when_finished "rm -rf \"$D\"/atomic" &&
+
+	cd "$D" &&
+	git clone . atomic &&
+	git branch atomic-mixed-branch &&
+	git tag atomic-mixed-tag &&
+	git rev-parse refs/heads/atomic-mixed-branch refs/tags/atomic-mixed-tag >actual &&
+
+	git -C atomic fetch --tags --atomic origin &&
+	git -C atomic rev-parse refs/remotes/origin/atomic-mixed-branch refs/tags/atomic-mixed-tag >expected &&
+	test_cmp expected actual
+'
+
+test_expect_success 'fetch --atomic prunes references' '
+	test_when_finished "rm -rf \"$D\"/atomic" &&
+
+	cd "$D" &&
+	git branch atomic-prune-delete &&
+	git clone . atomic &&
+	git branch --delete atomic-prune-delete &&
+	git branch atomic-prune-create &&
+	git rev-parse refs/heads/atomic-prune-create >actual &&
+
+	git -C atomic fetch --prune --atomic origin &&
+	test_must_fail git -C atomic rev-parse refs/remotes/origin/atomic-prune-delete &&
+	git -C atomic rev-parse refs/remotes/origin/atomic-prune-create >expected &&
+	test_cmp expected actual
+'
+
+test_expect_success 'fetch --atomic aborts with non-fast-forward update' '
+	test_when_finished "rm -rf \"$D\"/atomic" &&
+
+	cd "$D" &&
+	git branch atomic-non-ff &&
+	git clone . atomic &&
+	git rev-parse HEAD >actual &&
+
+	git branch atomic-new-branch &&
+	parent_commit=$(git rev-parse atomic-non-ff~) &&
+	git update-ref refs/heads/atomic-non-ff $parent_commit &&
+
+	test_must_fail git -C atomic fetch --atomic origin refs/heads/*:refs/remotes/origin/* &&
+	test_must_fail git -C atomic rev-parse refs/remotes/origin/atomic-new-branch &&
+	git -C atomic rev-parse refs/remotes/origin/atomic-non-ff >expected &&
+	test_cmp expected actual &&
+	test_must_be_empty atomic/.git/FETCH_HEAD
+'
+
+test_expect_success 'fetch --atomic executes a single reference transaction only' '
+	test_when_finished "rm -rf \"$D\"/atomic" &&
+
+	cd "$D" &&
+	git clone . atomic &&
+	git branch atomic-hooks-1 &&
+	git branch atomic-hooks-2 &&
+	head_oid=$(git rev-parse HEAD) &&
+
+	cat >expected <<-EOF &&
+		prepared
+		$ZERO_OID $head_oid refs/remotes/origin/atomic-hooks-1
+		$ZERO_OID $head_oid refs/remotes/origin/atomic-hooks-2
+		committed
+		$ZERO_OID $head_oid refs/remotes/origin/atomic-hooks-1
+		$ZERO_OID $head_oid refs/remotes/origin/atomic-hooks-2
+	EOF
+
+	rm -f atomic/actual &&
+	test_hook -C atomic reference-transaction <<-\EOF &&
+		( echo "$*" && cat ) >>actual
+	EOF
+
+	git -C atomic fetch --atomic origin &&
+	test_cmp expected atomic/actual
+'
+
+test_expect_success 'fetch --atomic aborts all reference updates if hook aborts' '
+	test_when_finished "rm -rf \"$D\"/atomic" &&
+
+	cd "$D" &&
+	git clone . atomic &&
+	git branch atomic-hooks-abort-1 &&
+	git branch atomic-hooks-abort-2 &&
+	git branch atomic-hooks-abort-3 &&
+	git tag atomic-hooks-abort &&
+	head_oid=$(git rev-parse HEAD) &&
+
+	cat >expected <<-EOF &&
+		prepared
+		$ZERO_OID $head_oid refs/remotes/origin/atomic-hooks-abort-1
+		$ZERO_OID $head_oid refs/remotes/origin/atomic-hooks-abort-2
+		$ZERO_OID $head_oid refs/remotes/origin/atomic-hooks-abort-3
+		$ZERO_OID $head_oid refs/tags/atomic-hooks-abort
+		aborted
+		$ZERO_OID $head_oid refs/remotes/origin/atomic-hooks-abort-1
+		$ZERO_OID $head_oid refs/remotes/origin/atomic-hooks-abort-2
+		$ZERO_OID $head_oid refs/remotes/origin/atomic-hooks-abort-3
+		$ZERO_OID $head_oid refs/tags/atomic-hooks-abort
+	EOF
+
+	rm -f atomic/actual &&
+	test_hook -C atomic/.git reference-transaction <<-\EOF &&
+		( echo "$*" && cat ) >>actual
+		exit 1
+	EOF
+
+	git -C atomic for-each-ref >expected-refs &&
+	test_must_fail git -C atomic fetch --tags --atomic origin &&
+	git -C atomic for-each-ref >actual-refs &&
+	test_cmp expected-refs actual-refs &&
+	test_must_be_empty atomic/.git/FETCH_HEAD
+'
+
+test_expect_success 'fetch --atomic --append appends to FETCH_HEAD' '
+	test_when_finished "rm -rf \"$D\"/atomic" &&
+
+	cd "$D" &&
+	git clone . atomic &&
+	oid=$(git rev-parse HEAD) &&
+
+	git branch atomic-fetch-head-1 &&
+	git -C atomic fetch --atomic origin atomic-fetch-head-1 &&
+	test_line_count = 1 atomic/.git/FETCH_HEAD &&
+
+	git branch atomic-fetch-head-2 &&
+	git -C atomic fetch --atomic --append origin atomic-fetch-head-2 &&
+	test_line_count = 2 atomic/.git/FETCH_HEAD &&
+	cp atomic/.git/FETCH_HEAD expected &&
+
+	test_hook -C atomic reference-transaction <<-\EOF &&
+		exit 1
+	EOF
+
+	git branch atomic-fetch-head-3 &&
+	test_must_fail git -C atomic fetch --atomic --append origin atomic-fetch-head-3 &&
+	test_cmp expected atomic/.git/FETCH_HEAD
+'
+
 test_expect_success '--refmap="" ignores configured refspec' '
 	cd "$TRASH_DIRECTORY" &&
 	git clone "$D" remote-refs &&
-	git -C remote-refs rev-parse remotes/origin/master >old &&
-	git -C remote-refs update-ref refs/remotes/origin/master master~1 &&
-	git -C remote-refs rev-parse remotes/origin/master >new &&
+	git -C remote-refs rev-parse remotes/origin/main >old &&
+	git -C remote-refs update-ref refs/remotes/origin/main main~1 &&
+	git -C remote-refs rev-parse remotes/origin/main >new &&
 	git -C remote-refs fetch --refmap= origin "+refs/heads/*:refs/hidden/origin/*" &&
-	git -C remote-refs rev-parse remotes/origin/master >actual &&
+	git -C remote-refs rev-parse remotes/origin/main >actual &&
 	test_cmp new actual &&
 	git -C remote-refs fetch origin &&
-	git -C remote-refs rev-parse remotes/origin/master >actual &&
+	git -C remote-refs rev-parse remotes/origin/main >actual &&
 	test_cmp old actual
 '
 
 test_expect_success '--refmap="" and --prune' '
-	git -C remote-refs update-ref refs/remotes/origin/foo/otherbranch master &&
-	git -C remote-refs update-ref refs/hidden/foo/otherbranch master &&
+	git -C remote-refs update-ref refs/remotes/origin/foo/otherbranch main &&
+	git -C remote-refs update-ref refs/hidden/foo/otherbranch main &&
 	git -C remote-refs fetch --prune --refmap="" origin +refs/heads/*:refs/hidden/* &&
 	git -C remote-refs rev-parse remotes/origin/foo/otherbranch &&
 	test_must_fail git -C remote-refs rev-parse refs/hidden/foo/otherbranch &&
@@ -246,11 +416,11 @@ test_expect_success 'fetch uses remote ref names to describe new refs' '
 	(
 		cd descriptive &&
 		git fetch o 2>actual &&
-		test_i18ngrep "new branch.* -> refs/crazyheads/descriptive-branch$" actual &&
-		test_i18ngrep "new tag.* -> descriptive-tag$" actual &&
-		test_i18ngrep "new ref.* -> crazy$" actual
+		test_grep "new branch.* -> refs/crazyheads/descriptive-branch$" actual &&
+		test_grep "new tag.* -> descriptive-tag$" actual &&
+		test_grep "new ref.* -> crazy$" actual
 	) &&
-	git checkout master
+	git checkout main
 '
 
 test_expect_success 'fetch must not resolve short tag name' '
@@ -281,7 +451,7 @@ test_expect_success 'create bundle 1' '
 	cd "$D" &&
 	echo >file updated again by origin &&
 	git commit -a -m "tip" &&
-	git bundle create --version=3 bundle1 master^..master
+	git bundle create --version=3 bundle1 main^..main
 '
 
 test_expect_success 'header of bundle looks right' '
@@ -289,7 +459,7 @@ test_expect_success 'header of bundle looks right' '
 	# v3 git bundle
 	@object-format=$(test_oid algo)
 	-OID updated by origin
-	OID refs/heads/master
+	OID refs/heads/main
 
 	EOF
 	sed -e "s/$OID_REGEX/OID/g" -e "5q" "$D"/bundle1 >actual &&
@@ -298,27 +468,25 @@ test_expect_success 'header of bundle looks right' '
 
 test_expect_success 'create bundle 2' '
 	cd "$D" &&
-	git bundle create bundle2 master~2..master
+	git bundle create bundle2 main~2..main
 '
 
 test_expect_success 'unbundle 1' '
 	cd "$D/bundle" &&
 	git checkout -b some-branch &&
-	test_must_fail git fetch "$D/bundle1" master:master
+	test_must_fail git fetch "$D/bundle1" main:main
 '
 
 
 test_expect_success 'bundle 1 has only 3 files ' '
 	cd "$D" &&
-	convert_bundle_to_pack <bundle1 >bundle.pack &&
-	git index-pack bundle.pack &&
-	test_bundle_object_count bundle.pack 3
+	test_bundle_object_count bundle1 3
 '
 
 test_expect_success 'unbundle 2' '
 	cd "$D/bundle" &&
-	git fetch ../bundle2 master:master &&
-	test "tip" = "$(git log -1 --pretty=oneline master | cut -d" " -f2)"
+	git fetch ../bundle2 main:main &&
+	test "tip" = "$(git log -1 --pretty=oneline main | cut -d" " -f2)"
 '
 
 test_expect_success 'bundle does not prerequisite objects' '
@@ -327,22 +495,20 @@ test_expect_success 'bundle does not prerequisite objects' '
 	git add file2 &&
 	git commit -m add.file2 file2 &&
 	git bundle create bundle3 -1 HEAD &&
-	convert_bundle_to_pack <bundle3 >bundle.pack &&
-	git index-pack bundle.pack &&
-	test_bundle_object_count bundle.pack 3
+	test_bundle_object_count bundle3 3
 '
 
 test_expect_success 'bundle should be able to create a full history' '
 
 	cd "$D" &&
-	git tag -a -m "1.0" v1.0 master &&
+	git tag -a -m "1.0" v1.0 main &&
 	git bundle create bundle4 v1.0
 
 '
 
 test_expect_success 'fetch with a non-applying branch.<name>.merge' '
-	git config branch.master.remote yeti &&
-	git config branch.master.merge refs/heads/bigfoot &&
+	git config branch.main.remote yeti &&
+	git config branch.main.merge refs/heads/bigfoot &&
 	git config remote.blub.url one &&
 	git config remote.blub.fetch "refs/heads/*:refs/remotes/one/*" &&
 	git fetch blub
@@ -362,8 +528,8 @@ test_expect_success 'fetch from GIT URL with a non-applying branch.<name>.merge
 # the merge spec matches the branch the remote HEAD points to
 test_expect_success 'fetch from GIT URL with a non-applying branch.<name>.merge [2]' '
 	one_ref=$(cd one && git symbolic-ref HEAD) &&
-	git config branch.master.remote blub &&
-	git config branch.master.merge "$one_ref" &&
+	git config branch.main.remote blub &&
+	git config branch.main.merge "$one_ref" &&
 	git update-ref -d FETCH_HEAD &&
 	git fetch one &&
 	test $one_head = "$(git rev-parse --verify FETCH_HEAD)" &&
@@ -373,7 +539,7 @@ test_expect_success 'fetch from GIT URL with a non-applying branch.<name>.merge
 # URL supplied to fetch matches the url of the configured branch's remote, but
 # the merge spec does not match the branch the remote HEAD points to
 test_expect_success 'fetch from GIT URL with a non-applying branch.<name>.merge [3]' '
-	git config branch.master.merge "${one_ref}_not" &&
+	git config branch.main.merge "${one_ref}_not" &&
 	git update-ref -d FETCH_HEAD &&
 	git fetch one &&
 	test $one_head = "$(git rev-parse --verify FETCH_HEAD)" &&
@@ -389,20 +555,20 @@ test_expect_success 'quoting of a strangely named repo' '
 test_expect_success 'bundle should record HEAD correctly' '
 
 	cd "$D" &&
-	git bundle create bundle5 HEAD master &&
+	git bundle create bundle5 HEAD main &&
 	git bundle list-heads bundle5 >actual &&
-	for h in HEAD refs/heads/master
+	for h in HEAD refs/heads/main
 	do
-		echo "$(git rev-parse --verify $h) $h"
+		echo "$(git rev-parse --verify $h) $h" || return 1
 	done >expect &&
 	test_cmp expect actual
 
 '
 
-test_expect_success 'mark initial state of origin/master' '
+test_expect_success 'mark initial state of origin/main' '
 	(
 		cd three &&
-		git tag base-origin-master refs/remotes/origin/master
+		git tag base-origin-main refs/remotes/origin/main
 	)
 '
 
@@ -412,10 +578,10 @@ test_expect_success 'explicit fetch should update tracking' '
 	git branch -f side &&
 	(
 		cd three &&
-		git update-ref refs/remotes/origin/master base-origin-master &&
-		o=$(git rev-parse --verify refs/remotes/origin/master) &&
-		git fetch origin master &&
-		n=$(git rev-parse --verify refs/remotes/origin/master) &&
+		git update-ref refs/remotes/origin/main base-origin-main &&
+		o=$(git rev-parse --verify refs/remotes/origin/main) &&
+		git fetch origin main &&
+		n=$(git rev-parse --verify refs/remotes/origin/main) &&
 		test "$o" != "$n" &&
 		test_must_fail git rev-parse --verify refs/remotes/origin/side
 	)
@@ -427,10 +593,10 @@ test_expect_success 'explicit pull should update tracking' '
 	git branch -f side &&
 	(
 		cd three &&
-		git update-ref refs/remotes/origin/master base-origin-master &&
-		o=$(git rev-parse --verify refs/remotes/origin/master) &&
-		git pull origin master &&
-		n=$(git rev-parse --verify refs/remotes/origin/master) &&
+		git update-ref refs/remotes/origin/main base-origin-main &&
+		o=$(git rev-parse --verify refs/remotes/origin/main) &&
+		git pull origin main &&
+		n=$(git rev-parse --verify refs/remotes/origin/main) &&
 		test "$o" != "$n" &&
 		test_must_fail git rev-parse --verify refs/remotes/origin/side
 	)
@@ -449,13 +615,13 @@ test_expect_success 'explicit --refmap option overrides remote.*.fetch' '
 	git branch -f side &&
 	(
 		cd three &&
-		git update-ref refs/remotes/origin/master base-origin-master &&
-		o=$(git rev-parse --verify refs/remotes/origin/master) &&
-		git fetch --refmap="refs/heads/*:refs/remotes/other/*" origin master &&
-		n=$(git rev-parse --verify refs/remotes/origin/master) &&
+		git update-ref refs/remotes/origin/main base-origin-main &&
+		o=$(git rev-parse --verify refs/remotes/origin/main) &&
+		git fetch --refmap="refs/heads/*:refs/remotes/other/*" origin main &&
+		n=$(git rev-parse --verify refs/remotes/origin/main) &&
 		test "$o" = "$n" &&
 		test_must_fail git rev-parse --verify refs/remotes/origin/side &&
-		git rev-parse --verify refs/remotes/other/master
+		git rev-parse --verify refs/remotes/other/main
 	)
 '
 
@@ -464,10 +630,10 @@ test_expect_success 'explicitly empty --refmap option disables remote.*.fetch' '
 	git branch -f side &&
 	(
 		cd three &&
-		git update-ref refs/remotes/origin/master base-origin-master &&
-		o=$(git rev-parse --verify refs/remotes/origin/master) &&
-		git fetch --refmap="" origin master &&
-		n=$(git rev-parse --verify refs/remotes/origin/master) &&
+		git update-ref refs/remotes/origin/main base-origin-main &&
+		o=$(git rev-parse --verify refs/remotes/origin/main) &&
+		git fetch --refmap="" origin main &&
+		n=$(git rev-parse --verify refs/remotes/origin/main) &&
 		test "$o" = "$n" &&
 		test_must_fail git rev-parse --verify refs/remotes/origin/side
 	)
@@ -479,10 +645,10 @@ test_expect_success 'configured fetch updates tracking' '
 	git branch -f side &&
 	(
 		cd three &&
-		git update-ref refs/remotes/origin/master base-origin-master &&
-		o=$(git rev-parse --verify refs/remotes/origin/master) &&
+		git update-ref refs/remotes/origin/main base-origin-main &&
+		o=$(git rev-parse --verify refs/remotes/origin/main) &&
 		git fetch origin &&
-		n=$(git rev-parse --verify refs/remotes/origin/master) &&
+		n=$(git rev-parse --verify refs/remotes/origin/main) &&
 		test "$o" != "$n" &&
 		git rev-parse --verify refs/remotes/origin/side
 	)
@@ -493,12 +659,12 @@ test_expect_success 'non-matching refspecs do not confuse tracking update' '
 	git update-ref refs/odd/location HEAD &&
 	(
 		cd three &&
-		git update-ref refs/remotes/origin/master base-origin-master &&
+		git update-ref refs/remotes/origin/main base-origin-main &&
 		git config --add remote.origin.fetch \
 			refs/odd/location:refs/remotes/origin/odd &&
-		o=$(git rev-parse --verify refs/remotes/origin/master) &&
-		git fetch origin master &&
-		n=$(git rev-parse --verify refs/remotes/origin/master) &&
+		o=$(git rev-parse --verify refs/remotes/origin/main) &&
+		git fetch origin main &&
+		n=$(git rev-parse --verify refs/remotes/origin/main) &&
 		test "$o" != "$n" &&
 		test_must_fail git rev-parse --verify refs/remotes/origin/odd
 	)
@@ -524,7 +690,7 @@ test_expect_success 'auto tag following fetches minimum' '
 			git tag -a -m $i excess-$i || exit 1
 		done
 	) &&
-	git checkout master &&
+	git checkout main &&
 	(
 		cd follow &&
 		git fetch
@@ -533,20 +699,33 @@ test_expect_success 'auto tag following fetches minimum' '
 
 test_expect_success 'refuse to fetch into the current branch' '
 
-	test_must_fail git fetch . side:master
+	test_must_fail git fetch . side:main
 
 '
 
 test_expect_success 'fetch into the current branch with --update-head-ok' '
 
-	git fetch --update-head-ok . side:master
+	git fetch --update-head-ok . side:main
+
+'
 
+test_expect_success 'fetch --dry-run does not touch FETCH_HEAD, but still prints what would be written' '
+	rm -f .git/FETCH_HEAD err &&
+	git fetch --dry-run . 2>err &&
+	! test -f .git/FETCH_HEAD &&
+	grep FETCH_HEAD err
 '
 
-test_expect_success 'fetch --dry-run' '
+test_expect_success '--no-write-fetch-head does not touch FETCH_HEAD, and does not print what would be written' '
+	rm -f .git/FETCH_HEAD err &&
+	git fetch --no-write-fetch-head . 2>err &&
+	! test -f .git/FETCH_HEAD &&
+	! grep FETCH_HEAD err
+'
 
+test_expect_success '--write-fetch-head gets defeated by --dry-run' '
 	rm -f .git/FETCH_HEAD &&
-	git fetch --dry-run . &&
+	git fetch --dry-run --write-fetch-head . &&
 	! test -f .git/FETCH_HEAD
 '
 
@@ -555,7 +734,7 @@ test_expect_success "should be able to fetch with duplicate refspecs" '
 	(
 		cd dups &&
 		git init &&
-		git config branch.master.remote three &&
+		git config branch.main.remote three &&
 		git config remote.three.url ../three/.git &&
 		git config remote.three.fetch +refs/heads/*:refs/remotes/origin/* &&
 		git config --add remote.three.fetch +refs/heads/*:refs/remotes/origin/* &&
@@ -612,6 +791,7 @@ test_expect_success 'fetch.writeCommitGraph' '
 '
 
 test_expect_success 'fetch.writeCommitGraph with submodules' '
+	test_config_global protocol.file.allow always &&
 	git clone dups super &&
 	(
 		cd super &&
@@ -623,10 +803,19 @@ test_expect_success 'fetch.writeCommitGraph with submodules' '
 		cd super-clone &&
 		rm -rf .git/objects/info &&
 		git -c fetch.writeCommitGraph=true fetch origin &&
-		test_path_is_file .git/objects/info/commit-graphs/commit-graph-chain
+		test_path_is_file .git/objects/info/commit-graphs/commit-graph-chain &&
+		git -c fetch.writeCommitGraph=true fetch --recurse-submodules origin
 	)
 '
 
+# fetches from first configured url
+test_expect_success 'fetch from multiple configured URLs in single remote' '
+	git init url1 &&
+	git remote add multipleurls url1 &&
+	git remote set-url --add multipleurls url2 &&
+	git fetch multipleurls
+'
+
 # configured prune tests
 
 set_config_tristate () {
@@ -675,7 +864,11 @@ test_configured_prune_type () {
 		then
 			new_cmdline=$cmdline_setup
 		else
-			new_cmdline=$(printf "%s" "$cmdline" | perl -pe 's[origin(?!/)]["'"$remote_url"'"]g')
+			new_cmdline=$(perl -e '
+				my ($cmdline, $url) = @ARGV;
+				$cmdline =~ s[origin(?!/)][quotemeta($url)]ge;
+				print $cmdline;
+			' -- "$cmdline" "$remote_url")
 		fi
 
 		if test "$fetch_prune_tags" = 'true' ||
@@ -864,14 +1057,12 @@ test_expect_success 'all boundary commits are excluded' '
 	test_commit oneside &&
 	git checkout HEAD^ &&
 	test_commit otherside &&
-	git checkout master &&
+	git checkout main &&
 	test_tick &&
 	git merge otherside &&
 	ad=$(git log --no-walk --format=%ad HEAD) &&
-	git bundle create twoside-boundary.bdl master --since="$ad" &&
-	convert_bundle_to_pack <twoside-boundary.bdl >twoside-boundary.pack &&
-	pack=$(git index-pack --fix-thin --stdin <twoside-boundary.pack) &&
-	test_bundle_object_count .git/objects/pack/pack-${pack##pack	}.pack 3
+	git bundle create twoside-boundary.bdl main --since="$ad" &&
+	test_bundle_object_count --thin twoside-boundary.bdl 3
 '
 
 test_expect_success 'fetch --prune prints the remotes url' '
@@ -883,7 +1074,7 @@ test_expect_success 'fetch --prune prints the remotes url' '
 		git fetch --prune origin 2>&1 | head -n1 >../actual
 	) &&
 	echo "From ${D}/." >expect &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 test_expect_success 'branchname D/F conflict resolved by --prune' '
@@ -923,64 +1114,66 @@ test_expect_success 'fetching with auto-gc does not lock up' '
 		git config fetch.unpackLimit 1 &&
 		git config gc.autoPackLimit 1 &&
 		git config gc.autoDetach false &&
-		GIT_ASK_YESNO="$D/askyesno" git fetch >fetch.out 2>&1 &&
-		test_i18ngrep "Auto packing the repository" fetch.out &&
+		GIT_ASK_YESNO="$D/askyesno" git fetch --verbose >fetch.out 2>&1 &&
+		test_grep "Auto packing the repository" fetch.out &&
 		! grep "Should I try again" fetch.out
 	)
 '
 
-test_expect_success C_LOCALE_OUTPUT 'fetch aligned output' '
-	git clone . full-output &&
-	test_commit looooooooooooong-tag &&
-	(
-		cd full-output &&
-		git -c fetch.output=full fetch origin >actual 2>&1 &&
-		grep -e "->" actual | cut -c 22- >../actual
-	) &&
-	cat >expect <<-\EOF &&
-	master               -> origin/master
-	looooooooooooong-tag -> looooooooooooong-tag
-	EOF
-	test_cmp expect actual
+for section in fetch transfer
+do
+	test_expect_success "$section.hideRefs affects connectivity check" '
+		GIT_TRACE="$PWD"/trace git -c $section.hideRefs=refs -c \
+			$section.hideRefs="!refs/tags/" fetch &&
+		grep "git rev-list .*--exclude-hidden=fetch" trace
+	'
+done
+
+test_expect_success 'prepare source branch' '
+	echo one >onebranch &&
+	git checkout --orphan onebranch &&
+	git rm --cached -r . &&
+	git add onebranch &&
+	git commit -m onebranch &&
+	git rev-list --objects onebranch -- >actual &&
+	# 3 objects should be created, at least ...
+	test 3 -le $(wc -l <actual)
 '
 
-test_expect_success C_LOCALE_OUTPUT 'fetch compact output' '
-	git clone . compact &&
-	test_commit extraaa &&
-	(
-		cd compact &&
-		git -c fetch.output=compact fetch origin >actual 2>&1 &&
-		grep -e "->" actual | cut -c 22- >../actual
-	) &&
-	cat >expect <<-\EOF &&
-	master     -> origin/*
-	extraaa    -> *
-	EOF
-	test_cmp expect actual
-'
+validate_store_type () {
+	git -C dest count-objects -v >actual &&
+	case "$store_type" in
+	packed)
+		grep "^count: 0$" actual ;;
+	loose)
+		grep "^packs: 0$" actual ;;
+	esac || {
+		echo "store_type is $store_type"
+		cat actual
+		false
+	}
+}
 
-test_expect_success '--no-show-forced-updates' '
-	mkdir forced-updates &&
-	(
-		cd forced-updates &&
-		git init &&
-		test_commit 1 &&
-		test_commit 2
-	) &&
-	git clone forced-updates forced-update-clone &&
-	git clone forced-updates no-forced-update-clone &&
-	git -C forced-updates reset --hard HEAD~1 &&
-	(
-		cd forced-update-clone &&
-		git fetch --show-forced-updates origin 2>output &&
-		test_i18ngrep "(forced update)" output
-	) &&
-	(
-		cd no-forced-update-clone &&
-		git fetch --no-show-forced-updates origin 2>output &&
-		test_i18ngrep ! "(forced update)" output
-	)
-'
+test_unpack_limit () {
+	store_type=$1
+
+	case "$store_type" in
+	packed) fetch_limit=1 transfer_limit=10000 ;;
+	loose) fetch_limit=10000 transfer_limit=1 ;;
+	esac
+
+	test_expect_success "fetch trumps transfer limit" '
+		rm -fr dest &&
+		git --bare init dest &&
+		git -C dest config fetch.unpacklimit $fetch_limit &&
+		git -C dest config transfer.unpacklimit $transfer_limit &&
+		git -C dest fetch .. onebranch &&
+		validate_store_type
+	'
+}
+
+test_unpack_limit packed
+test_unpack_limit loose
 
 setup_negotiation_tip () {
 	SERVER="$1"
@@ -988,7 +1181,7 @@ setup_negotiation_tip () {
 	USE_PROTOCOL_V2="$3"
 
 	rm -rf "$SERVER" client trace &&
-	git init "$SERVER" &&
+	git init -b main "$SERVER" &&
 	test_commit -C "$SERVER" alpha_1 &&
 	test_commit -C "$SERVER" alpha_2 &&
 	git -C "$SERVER" checkout --orphan beta &&
@@ -1004,7 +1197,7 @@ setup_negotiation_tip () {
 	fi &&
 
 	test_commit -C "$SERVER" beta_s &&
-	git -C "$SERVER" checkout master &&
+	git -C "$SERVER" checkout main &&
 	test_commit -C "$SERVER" alpha_s &&
 	git -C "$SERVER" tag -d alpha_1 alpha_2 beta_1 beta_2
 }
@@ -1046,6 +1239,19 @@ test_expect_success '--negotiation-tip understands abbreviated SHA-1' '
 	check_negotiation_tip
 '
 
+test_expect_success '--negotiation-tip rejects missing OIDs' '
+	setup_negotiation_tip server server 0 &&
+	test_must_fail git -C client fetch \
+		--negotiation-tip=alpha_1 \
+		--negotiation-tip=$(test_oid zero) \
+		origin alpha_s beta_s 2>err &&
+	cat >fatal-expect <<-EOF &&
+	fatal: the object $(test_oid zero) does not exist
+EOF
+	grep fatal: err >fatal-actual &&
+	test_cmp fatal-expect fatal-actual
+'
+
 . "$TEST_DIRECTORY"/lib-httpd.sh
 start_httpd
 
diff --git a/t/t5511-refspec.sh b/t/t5511-refspec.sh
index f541f30..fc55681 100755
--- a/t/t5511-refspec.sh
+++ b/t/t5511-refspec.sh
@@ -2,6 +2,7 @@
 
 test_description='refspec parsing'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_refspec () {
@@ -33,7 +34,7 @@ test_refspec fetch '::'						invalid
 test_refspec push 'refs/heads/*:refs/remotes/frotz/*'
 test_refspec push 'refs/heads/*:refs/remotes/frotz'		invalid
 test_refspec push 'refs/heads:refs/remotes/frotz/*'		invalid
-test_refspec push 'refs/heads/master:refs/remotes/frotz/xyzzy'
+test_refspec push 'refs/heads/main:refs/remotes/frotz/xyzzy'
 
 
 # These have invalid LHS, but we do not have a formal "valid sha-1
@@ -41,23 +42,25 @@ test_refspec push 'refs/heads/master:refs/remotes/frotz/xyzzy'
 # code.  They will be caught downstream anyway, but we may want to
 # have tighter check later...
 
-: test_refspec push 'refs/heads/master::refs/remotes/frotz/xyzzy'	invalid
+: test_refspec push 'refs/heads/main::refs/remotes/frotz/xyzzy'	invalid
 : test_refspec push 'refs/heads/maste :refs/remotes/frotz/xyzzy'	invalid
 
 test_refspec fetch 'refs/heads/*:refs/remotes/frotz/*'
 test_refspec fetch 'refs/heads/*:refs/remotes/frotz'		invalid
 test_refspec fetch 'refs/heads:refs/remotes/frotz/*'		invalid
-test_refspec fetch 'refs/heads/master:refs/remotes/frotz/xyzzy'
-test_refspec fetch 'refs/heads/master::refs/remotes/frotz/xyzzy'	invalid
+test_refspec fetch 'refs/heads/main:refs/remotes/frotz/xyzzy'
+test_refspec fetch 'refs/heads/main::refs/remotes/frotz/xyzzy'	invalid
 test_refspec fetch 'refs/heads/maste :refs/remotes/frotz/xyzzy'	invalid
 
-test_refspec push 'master~1:refs/remotes/frotz/backup'
-test_refspec fetch 'master~1:refs/remotes/frotz/backup'		invalid
+test_refspec push 'main~1:refs/remotes/frotz/backup'
+test_refspec fetch 'main~1:refs/remotes/frotz/backup'		invalid
 test_refspec push 'HEAD~4:refs/remotes/frotz/new'
 test_refspec fetch 'HEAD~4:refs/remotes/frotz/new'		invalid
 
 test_refspec push 'HEAD'
 test_refspec fetch 'HEAD'
+test_refspec push '@'
+test_refspec fetch '@'
 test_refspec push 'refs/heads/ nitfol'				invalid
 test_refspec fetch 'refs/heads/ nitfol'				invalid
 
diff --git a/t/t5512-ls-remote.sh b/t/t5512-ls-remote.sh
index e98c3a0..5dbe107 100755
--- a/t/t5512-ls-remote.sh
+++ b/t/t5512-ls-remote.sh
@@ -2,6 +2,9 @@
 
 test_description='git ls-remote'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 generate_references () {
@@ -12,6 +15,23 @@ generate_references () {
 	done
 }
 
+test_expect_success 'set up fake upload-pack' '
+	# This can be used to simulate an upload-pack that just shows the
+	# contents of the "input" file (prepared with the test-tool pkt-line
+	# helper), and does not do any negotiation (since ls-remote does not
+	# need it).
+	write_script cat-input <<-\EOF
+	# send our initial advertisement/response
+	cat input
+	# soak up the flush packet from the client
+	cat
+	EOF
+'
+
+test_expect_success 'dies when no remote found' '
+	test_must_fail git ls-remote
+'
+
 test_expect_success setup '
 	>file &&
 	git add file &&
@@ -27,7 +47,8 @@ test_expect_success setup '
 	git show-ref -d	>refs &&
 	sed -e "s/ /	/" refs >>expected.all &&
 
-	git remote add self "$(pwd)/.git"
+	git remote add self "$(pwd)/.git" &&
+	git remote add self2 "."
 '
 
 test_expect_success 'ls-remote --tags .git' '
@@ -80,11 +101,17 @@ test_expect_success 'ls-remote --sort="-refname" --tags self' '
 	test_cmp expect actual
 '
 
-test_expect_success 'dies when no remote specified and no default remotes found' '
+test_expect_success 'dies when no remote specified, multiple remotes found, and no default specified' '
 	test_must_fail git ls-remote
 '
 
-test_expect_success 'use "origin" when no remote specified' '
+test_expect_success 'succeeds when no remote specified but only one found' '
+	test_when_finished git remote add self2 "." &&
+	git remote remove self2 &&
+	git ls-remote
+'
+
+test_expect_success 'use "origin" when no remote specified and multiple found' '
 	URL="$(pwd)/.git" &&
 	echo "From $URL" >exp_err &&
 
@@ -118,7 +145,7 @@ test_expect_success 'use branch.<name>.remote if possible' '
 	echo "From $URL" >exp_err &&
 
 	git remote add other $URL &&
-	git config branch.master.remote other &&
+	git config branch.main.remote other &&
 
 	git ls-remote 2>actual_err >actual &&
 	test_cmp exp_err actual_err &&
@@ -129,9 +156,9 @@ test_expect_success 'confuses pattern as remote when no remote specified' '
 	if test_have_prereq MINGW
 	then
 		# Windows does not like asterisks in pathname
-		does_not_exist=master
+		does_not_exist=main
 	else
-		does_not_exist="refs*master"
+		does_not_exist="refs*main"
 	fi &&
 	cat >exp <<-EOF &&
 	fatal: '\''$does_not_exist'\'' does not appear to be a git repository
@@ -144,10 +171,10 @@ test_expect_success 'confuses pattern as remote when no remote specified' '
 	# Do not expect "git ls-remote <pattern>" to work; ls-remote needs
 	# <remote> if you want to feed <pattern>, just like you cannot say
 	# fetch <branch>.
-	# We could just as easily have used "master"; the "*" emphasizes its
+	# We could just as easily have used "main"; the "*" emphasizes its
 	# role as a pattern.
 	test_must_fail git ls-remote "$does_not_exist" >actual 2>&1 &&
-	test_i18ncmp exp actual
+	test_cmp exp actual
 '
 
 test_expect_success 'die with non-2 for wrong repository even with --exit-code' '
@@ -217,100 +244,68 @@ test_expect_success 'protocol v2 supports hiderefs' '
 
 test_expect_success 'ls-remote --symref' '
 	git fetch origin &&
-	echo "ref: refs/heads/master	HEAD" >expect &&
+	echo "ref: refs/heads/main	HEAD" >expect.v2 &&
 	generate_references \
 		HEAD \
-		refs/heads/master >>expect &&
+		refs/heads/main >>expect.v2 &&
+	echo "ref: refs/remotes/origin/main	refs/remotes/origin/HEAD" >>expect.v2 &&
 	oid=$(git rev-parse HEAD) &&
-	echo "$oid	refs/remotes/origin/HEAD" >>expect &&
+	echo "$oid	refs/remotes/origin/HEAD" >>expect.v2 &&
 	generate_references \
-		refs/remotes/origin/master \
+		refs/remotes/origin/main \
 		refs/tags/mark \
 		refs/tags/mark1.1 \
 		refs/tags/mark1.10 \
-		refs/tags/mark1.2 >>expect &&
-	# Protocol v2 supports sending symrefs for refs other than HEAD, so use
-	# protocol v0 here.
-	GIT_TEST_PROTOCOL_VERSION=0 git ls-remote --symref >actual &&
-	test_cmp expect actual
+		refs/tags/mark1.2 >>expect.v2 &&
+	# v0 does not show non-HEAD symrefs
+	grep -v "ref: refs/remotes" <expect.v2 >expect.v0 &&
+	git -c protocol.version=0 ls-remote --symref >actual.v0 &&
+	test_cmp expect.v0 actual.v0 &&
+	git -c protocol.version=2 ls-remote --symref >actual.v2 &&
+	test_cmp expect.v2 actual.v2
 '
 
 test_expect_success 'ls-remote with filtered symref (refname)' '
 	rev=$(git rev-parse HEAD) &&
 	cat >expect <<-EOF &&
-	ref: refs/heads/master	HEAD
+	ref: refs/heads/main	HEAD
 	$rev	HEAD
 	EOF
-	# Protocol v2 supports sending symrefs for refs other than HEAD, so use
-	# protocol v0 here.
-	GIT_TEST_PROTOCOL_VERSION=0 git ls-remote --symref . HEAD >actual &&
+	git ls-remote --symref . HEAD >actual &&
 	test_cmp expect actual
 '
 
-test_expect_failure 'ls-remote with filtered symref (--heads)' '
+test_expect_success 'ls-remote with filtered symref (--heads)' '
 	git symbolic-ref refs/heads/foo refs/tags/mark &&
-	cat >expect <<-EOF &&
+	cat >expect.v2 <<-EOF &&
 	ref: refs/tags/mark	refs/heads/foo
 	$rev	refs/heads/foo
-	$rev	refs/heads/master
+	$rev	refs/heads/main
 	EOF
-	# Protocol v2 supports sending symrefs for refs other than HEAD, so use
-	# protocol v0 here.
-	GIT_TEST_PROTOCOL_VERSION=0 git ls-remote --symref --heads . >actual &&
-	test_cmp expect actual
+	grep -v "^ref: refs/tags/" <expect.v2 >expect.v0 &&
+	git -c protocol.version=0 ls-remote --symref --heads . >actual.v0 &&
+	test_cmp expect.v0 actual.v0 &&
+	git -c protocol.version=2 ls-remote --symref --heads . >actual.v2 &&
+	test_cmp expect.v2 actual.v2
 '
 
-test_expect_success 'ls-remote --symref omits filtered-out matches' '
-	cat >expect <<-EOF &&
-	$rev	refs/heads/foo
-	$rev	refs/heads/master
+test_expect_success 'indicate no refs in v0 standards-compliant empty remote' '
+	# Git does not produce an output like this, but it does match the
+	# standard and is produced by other implementations like JGit. So
+	# hard-code the case we care about.
+	#
+	# The actual capabilities do not matter; there are none that would
+	# change how ls-remote behaves.
+	oid=0000000000000000000000000000000000000000 &&
+	test-tool pkt-line pack >input.q <<-EOF &&
+	$oid capabilities^{}Qcaps-go-here
+	0000
 	EOF
-	# Protocol v2 supports sending symrefs for refs other than HEAD, so use
-	# protocol v0 here.
-	GIT_TEST_PROTOCOL_VERSION=0 git ls-remote --symref --heads . >actual &&
-	test_cmp expect actual &&
-	GIT_TEST_PROTOCOL_VERSION=0 git ls-remote --symref . "refs/heads/*" >actual &&
-	test_cmp expect actual
-'
-
-test_lazy_prereq GIT_DAEMON '
-	test_bool_env GIT_TEST_GIT_DAEMON true
-'
+	q_to_nul <input.q >input &&
 
-# This test spawns a daemon, so run it only if the user would be OK with
-# testing with git-daemon.
-test_expect_success PIPE,JGIT,GIT_DAEMON 'indicate no refs in standards-compliant empty remote' '
-	test_set_port JGIT_DAEMON_PORT &&
-	JGIT_DAEMON_PID= &&
-	git init --bare empty.git &&
-	>empty.git/git-daemon-export-ok &&
-	mkfifo jgit_daemon_output &&
-	{
-		jgit daemon --port="$JGIT_DAEMON_PORT" . >jgit_daemon_output &
-		JGIT_DAEMON_PID=$!
-	} &&
-	test_when_finished kill "$JGIT_DAEMON_PID" &&
-	{
-		read line &&
-		case $line in
-		Exporting*)
-			;;
-		*)
-			echo "Expected: Exporting" &&
-			false;;
-		esac &&
-		read line &&
-		case $line in
-		"Listening on"*)
-			;;
-		*)
-			echo "Expected: Listening on" &&
-			false;;
-		esac
-	} <jgit_daemon_output &&
 	# --exit-code asks the command to exit with 2 when no
 	# matching refs are found.
-	test_expect_code 2 git ls-remote --exit-code git://localhost:$JGIT_DAEMON_PORT/empty.git
+	test_expect_code 2 git ls-remote --exit-code --upload-pack=./cat-input .
 '
 
 test_expect_success 'ls-remote works outside repository' '
@@ -325,25 +320,64 @@ test_expect_success 'ls-remote works outside repository' '
 test_expect_success 'ls-remote --sort fails gracefully outside repository' '
 	# Use a sort key that requires access to the referenced objects.
 	nongit test_must_fail git ls-remote --sort=authordate "$TRASH_DIRECTORY" 2>err &&
-	test_i18ngrep "^fatal: not a git repository, but the field '\''authordate'\'' requires access to object data" err
+	test_grep "^fatal: not a git repository, but the field '\''authordate'\'' requires access to object data" err
 '
 
 test_expect_success 'ls-remote patterns work with all protocol versions' '
 	git for-each-ref --format="%(objectname)	%(refname)" \
-		refs/heads/master refs/remotes/origin/master >expect &&
-	git -c protocol.version=1 ls-remote . master >actual.v1 &&
-	test_cmp expect actual.v1 &&
-	git -c protocol.version=2 ls-remote . master >actual.v2 &&
+		refs/heads/main refs/remotes/origin/main >expect &&
+	git -c protocol.version=0 ls-remote . main >actual.v0 &&
+	test_cmp expect actual.v0 &&
+	git -c protocol.version=2 ls-remote . main >actual.v2 &&
 	test_cmp expect actual.v2
 '
 
 test_expect_success 'ls-remote prefixes work with all protocol versions' '
 	git for-each-ref --format="%(objectname)	%(refname)" \
 		refs/heads/ refs/tags/ >expect &&
-	git -c protocol.version=1 ls-remote --heads --tags . >actual.v1 &&
-	test_cmp expect actual.v1 &&
+	git -c protocol.version=0 ls-remote --heads --tags . >actual.v0 &&
+	test_cmp expect actual.v0 &&
 	git -c protocol.version=2 ls-remote --heads --tags . >actual.v2 &&
 	test_cmp expect actual.v2
 '
 
+test_expect_success 'v0 clients can handle multiple symrefs' '
+	# Modern versions of Git will not return multiple symref capabilities
+	# for v0, so we have to hard-code the response. Note that we will
+	# always use both v0 and object-format=sha1 here, as the hard-coded
+	# response reflects a server that only supports those.
+	oid=1234567890123456789012345678901234567890 &&
+	symrefs="symref=refs/remotes/origin/HEAD:refs/remotes/origin/main" &&
+	symrefs="$symrefs symref=HEAD:refs/heads/main" &&
+
+	# Likewise we want to make sure our parser is not fooled by the string
+	# "symref" appearing as part of an earlier cap. But there is no way to
+	# do that via upload-pack, as arbitrary strings can appear only in a
+	# "symref" value itself (where we skip past the values as a whole)
+	# and "agent" (which always appears after "symref", so putting our
+	# parser in a confused state is less interesting).
+	caps="some other caps including a-fake-symref-cap" &&
+
+	test-tool pkt-line pack >input.q <<-EOF &&
+	$oid HEADQ$caps $symrefs
+	$oid refs/heads/main
+	$oid refs/remotes/origin/HEAD
+	$oid refs/remotes/origin/main
+	0000
+	EOF
+	q_to_nul <input.q >input &&
+
+	cat >expect <<-EOF &&
+	ref: refs/heads/main	HEAD
+	$oid	HEAD
+	$oid	refs/heads/main
+	ref: refs/remotes/origin/main	refs/remotes/origin/HEAD
+	$oid	refs/remotes/origin/HEAD
+	$oid	refs/remotes/origin/main
+	EOF
+
+	git ls-remote --symref --upload-pack=./cat-input . >actual &&
+	test_cmp expect actual
+'
+
 test_done
diff --git a/t/t5513-fetch-track.sh b/t/t5513-fetch-track.sh
index 65d1e05..c46c4db 100755
--- a/t/t5513-fetch-track.sh
+++ b/t/t5513-fetch-track.sh
@@ -2,6 +2,7 @@
 
 test_description='fetch follows remote-tracking branches correctly'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
diff --git a/t/t5514-fetch-multiple.sh b/t/t5514-fetch-multiple.sh
index de8e2f1..25772c8 100755
--- a/t/t5514-fetch-multiple.sh
+++ b/t/t5514-fetch-multiple.sh
@@ -2,6 +2,9 @@
 
 test_description='fetch --all works correctly'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 setup_repository () {
@@ -17,10 +20,19 @@ setup_repository () {
 	git add elif &&
 	test_tick &&
 	git commit -m "Second" &&
-	git checkout master
+	git checkout main
 	)
 }
 
+setup_test_clone () {
+	test_dir="$1" &&
+	git clone one "$test_dir" &&
+	for r in one two three
+	do
+		git -C "$test_dir" remote add "$r" "../$r" || return 1
+	done
+}
+
 test_expect_success setup '
 	setup_repository one &&
 	setup_repository two &&
@@ -32,16 +44,16 @@ test_expect_success setup '
 '
 
 cat > test/expect << EOF
-  one/master
+  one/main
   one/side
-  origin/HEAD -> origin/master
-  origin/master
+  origin/HEAD -> origin/main
+  origin/main
   origin/side
   three/another
-  three/master
+  three/main
   three/side
   two/another
-  two/master
+  two/main
   two/side
 EOF
 
@@ -55,6 +67,13 @@ test_expect_success 'git fetch --all' '
 	 test_cmp expect output)
 '
 
+test_expect_success 'git fetch --all --no-write-fetch-head' '
+	(cd test &&
+	rm -f .git/FETCH_HEAD &&
+	git fetch --all --no-write-fetch-head &&
+	test_path_is_missing .git/FETCH_HEAD)
+'
+
 test_expect_success 'git fetch --all should continue if a remote has errors' '
 	(git clone one test2 &&
 	 cd test2 &&
@@ -70,15 +89,15 @@ test_expect_success 'git fetch --all should continue if a remote has errors' '
 test_expect_success 'git fetch --all does not allow non-option arguments' '
 	(cd test &&
 	 test_must_fail git fetch --all origin &&
-	 test_must_fail git fetch --all origin master)
+	 test_must_fail git fetch --all origin main)
 '
 
 cat > expect << EOF
-  origin/HEAD -> origin/master
-  origin/master
+  origin/HEAD -> origin/main
+  origin/main
   origin/side
   three/another
-  three/master
+  three/main
   three/side
 EOF
 
@@ -92,10 +111,10 @@ test_expect_success 'git fetch --multiple (but only one remote)' '
 '
 
 cat > expect << EOF
-  one/master
+  one/main
   one/side
   two/another
-  two/master
+  two/main
   two/side
 EOF
 
@@ -108,7 +127,7 @@ test_expect_success 'git fetch --multiple (two remotes)' '
 	 GIT_TRACE=1 git fetch --multiple one two 2>trace &&
 	 git branch -r > output &&
 	 test_cmp ../expect output &&
-	 grep "built-in: git gc" trace >gc &&
+	 grep "built-in: git maintenance" trace >gc &&
 	 test_line_count = 1 gc
 	)
 '
@@ -133,13 +152,13 @@ test_expect_success 'git fetch --all (skipFetchAll)' '
 '
 
 cat > expect << EOF
-  one/master
+  one/main
   one/side
   three/another
-  three/master
+  three/main
   three/side
   two/another
-  two/master
+  two/main
   two/side
 EOF
 
@@ -190,8 +209,165 @@ test_expect_success 'parallel' '
 	test_must_fail env GIT_TRACE="$PWD/trace" \
 		git fetch --jobs=2 --multiple one two 2>err &&
 	grep "preparing to run up to 2 tasks" trace &&
-	test_i18ngrep "could not fetch .one.*128" err &&
-	test_i18ngrep "could not fetch .two.*128" err
+	test_grep "could not fetch .one.*128" err &&
+	test_grep "could not fetch .two.*128" err
+'
+
+test_expect_success 'git fetch --multiple --jobs=0 picks a default' '
+	(cd test &&
+	 git fetch --multiple --jobs=0)
+'
+
+create_fetch_all_expect () {
+	cat >expect <<-\EOF
+	  one/main
+	  one/side
+	  origin/HEAD -> origin/main
+	  origin/main
+	  origin/side
+	  three/another
+	  three/main
+	  three/side
+	  two/another
+	  two/main
+	  two/side
+	EOF
+}
+
+for fetch_all in true false
+do
+	test_expect_success "git fetch --all (works with fetch.all = $fetch_all)" '
+		test_dir="test_fetch_all_$fetch_all" &&
+		setup_test_clone "$test_dir" &&
+		(
+			cd "$test_dir" &&
+			git config fetch.all $fetch_all &&
+			git fetch --all &&
+			create_fetch_all_expect &&
+			git branch -r >actual &&
+			test_cmp expect actual
+		)
+	'
+done
+
+test_expect_success 'git fetch (fetch all remotes with fetch.all = true)' '
+	setup_test_clone test9 &&
+	(
+		cd test9 &&
+		git config fetch.all true &&
+		git fetch &&
+		git branch -r >actual &&
+		create_fetch_all_expect &&
+		test_cmp expect actual
+	)
+'
+
+create_fetch_one_expect () {
+	cat >expect <<-\EOF
+	  one/main
+	  one/side
+	  origin/HEAD -> origin/main
+	  origin/main
+	  origin/side
+	EOF
+}
+
+test_expect_success 'git fetch one (explicit remote overrides fetch.all)' '
+	setup_test_clone test10 &&
+	(
+		cd test10 &&
+		git config fetch.all true &&
+		git fetch one &&
+		create_fetch_one_expect &&
+		git branch -r >actual &&
+		test_cmp expect actual
+	)
+'
+
+create_fetch_two_as_origin_expect () {
+	cat >expect <<-\EOF
+	  origin/HEAD -> origin/main
+	  origin/another
+	  origin/main
+	  origin/side
+	EOF
+}
+
+test_expect_success 'git config fetch.all false (fetch only default remote)' '
+	setup_test_clone test11 &&
+	(
+		cd test11 &&
+		git config fetch.all false &&
+		git remote set-url origin ../two &&
+		git fetch &&
+		create_fetch_two_as_origin_expect &&
+		git branch -r >actual &&
+		test_cmp expect actual
+	)
+'
+
+for fetch_all in true false
+do
+	test_expect_success "git fetch --no-all (fetch only default remote with fetch.all = $fetch_all)" '
+		test_dir="test_no_all_fetch_all_$fetch_all" &&
+		setup_test_clone "$test_dir" &&
+		(
+			cd "$test_dir" &&
+			git config fetch.all $fetch_all &&
+			git remote set-url origin ../two &&
+			git fetch --no-all &&
+			create_fetch_two_as_origin_expect &&
+			git branch -r >actual &&
+			test_cmp expect actual
+		)
+	'
+done
+
+test_expect_success 'git fetch --no-all (fetch only default remote without fetch.all)' '
+	setup_test_clone test12 &&
+	(
+		cd test12 &&
+		git config --unset-all fetch.all || true &&
+		git remote set-url origin ../two &&
+		git fetch --no-all &&
+		create_fetch_two_as_origin_expect &&
+		git branch -r >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'git fetch --all --no-all (fetch only default remote)' '
+	setup_test_clone test13 &&
+	(
+		cd test13 &&
+		git remote set-url origin ../two &&
+		git fetch --all --no-all &&
+		create_fetch_two_as_origin_expect &&
+		git branch -r >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'git fetch --no-all one (fetch only explicit remote)' '
+	setup_test_clone test14 &&
+	(
+		cd test14 &&
+		git fetch --no-all one &&
+		create_fetch_one_expect &&
+		git branch -r >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'git fetch --no-all --all (fetch all remotes)' '
+	setup_test_clone test15 &&
+	(
+		cd test15 &&
+		git fetch --no-all --all &&
+		create_fetch_all_expect &&
+		git branch -r >actual &&
+		test_cmp expect actual
+	)
 '
 
 test_done
diff --git a/t/t5515-fetch-merge-logic.sh b/t/t5515-fetch-merge-logic.sh
index 9d6a46f..c100a80 100755
--- a/t/t5515-fetch-merge-logic.sh
+++ b/t/t5515-fetch-merge-logic.sh
@@ -11,11 +11,15 @@ test_description='Merge logic in fetch'
 GIT_TEST_PROTOCOL_VERSION=0
 export GIT_TEST_PROTOCOL_VERSION
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 build_script () {
 	script="$1" &&
-	for i in one three_file master master2 one_tree three two two2 three2
+	for i in one three_file main topic_2 one_tree three two two2 three2
 	do
 		echo "s/$(test_oid --hash=sha1 "$i")/$(test_oid "$i")/g" >>"$script"
 	done
@@ -40,8 +44,8 @@ test_expect_success setup '
 	three_file sha1:0e3b14047d3ee365f4f2a1b673db059c3972589c
 	three_file sha256:bc4447d50c07497a8bfe6eef817f2364ecca9d471452e43b52756cc1a908bd32
 
-	master sha1:6c9dec2b923228c9ff994c6cfe4ae16c12408dc5
-	master sha256:8521c3072461fcfe8f32d67f95cc6e6b832a2db2fa29769ffc788bce85ebcd75
+	main sha1:ecf3b3627b498bdcb735cc4343bf165f76964e9a
+	main sha256:fff666109892bb4b1c80cd1649d2d8762a0663db8b5d46c8be98360b64fbba5f
 
 	one_tree sha1:22feea448b023a2d864ef94b013735af34d238ba
 	one_tree sha256:6e4743f4ef2356b881dda5e91f5c7cdffe870faf350bf7b312f80a20935f5d83
@@ -52,8 +56,8 @@ test_expect_success setup '
 	two sha1:525b7fb068d59950d185a8779dc957c77eed73ba
 	two sha256:3b21de3440cd38c2a9e9b464adb923f7054949ed4c918e1a0ac4c95cd52774db
 
-	master2 sha1:754b754407bf032e9a2f9d5a9ad05ca79a6b228f
-	master2 sha256:6c7abaea8a6d8ef4d89877e68462758dc6774690fbbbb0e6d7dd57415c9abde0
+	topic_2 sha1:b4ab76b1a01ea602209932134a44f1e6bd610832
+	topic_2 sha256:380ebae0113f877ce46fcdf39d5bc33e4dc0928db5c5a4d5fdc78381c4d55ae3
 
 	two2 sha1:6134ee8f857693b96ff1cc98d3e2fd62b199e5a8
 	two2 sha256:87a2d3ee29c83a3dc7afd41c0606b11f67603120b910a7be7840accdc18344d4
@@ -80,9 +84,9 @@ test_expect_success setup '
 	git tag -a -m "Tag Three file" tag-three-file HEAD^{tree}:file &&
 	git branch three &&
 
-	echo master >> file &&
-	git commit -a -m Master &&
-	git tag -a -m "Tag Master" tag-master &&
+	echo main >> file &&
+	git commit -a -m Main &&
+	git tag -a -m "Tag Main" tag-main &&
 
 	git checkout three &&
 
@@ -91,7 +95,7 @@ test_expect_success setup '
 	git config remote.origin.url ../.git/ &&
 
 	git config remote.config-explicit.url ../.git/ &&
-	git config remote.config-explicit.fetch refs/heads/master:remotes/rem/master &&
+	git config remote.config-explicit.fetch refs/heads/main:remotes/rem/main &&
 	git config --add remote.config-explicit.fetch refs/heads/one:remotes/rem/one &&
 	git config --add remote.config-explicit.fetch two:remotes/rem/two &&
 	git config --add remote.config-explicit.fetch refs/heads/three:remotes/rem/three &&
@@ -102,19 +106,19 @@ test_expect_success setup '
 	remotes="$remotes config-glob" &&
 
 	mkdir -p .git/remotes &&
-	{
-		echo "URL: ../.git/"
-		echo "Pull: refs/heads/master:remotes/rem/master"
-		echo "Pull: refs/heads/one:remotes/rem/one"
-		echo "Pull: two:remotes/rem/two"
-		echo "Pull: refs/heads/three:remotes/rem/three"
-	} >.git/remotes/remote-explicit &&
+	cat >.git/remotes/remote-explicit <<-\EOF &&
+	URL: ../.git/
+	Pull: refs/heads/main:remotes/rem/main
+	Pull: refs/heads/one:remotes/rem/one
+	Pull: two:remotes/rem/two
+	Pull: refs/heads/three:remotes/rem/three
+	EOF
 	remotes="$remotes remote-explicit" &&
 
-	{
-		echo "URL: ../.git/"
-		echo "Pull: refs/heads/*:refs/remotes/rem/*"
-	} >.git/remotes/remote-glob &&
+	cat >.git/remotes/remote-glob <<-\EOF &&
+	URL: ../.git/
+	Pull: refs/heads/*:refs/remotes/rem/*
+	EOF
 	remotes="$remotes remote-glob" &&
 
 	mkdir -p .git/branches &&
@@ -130,7 +134,7 @@ test_expect_success setup '
 		git config branch.br-$remote-merge.merge refs/heads/three &&
 		git config branch.br-$remote-octopus.remote $remote &&
 		git config branch.br-$remote-octopus.merge refs/heads/one &&
-		git config --add branch.br-$remote-octopus.merge two
+		git config --add branch.br-$remote-octopus.merge two || return 1
 	done &&
 	build_script sed_script
 '
@@ -149,7 +153,7 @@ done > tests
 # but does depend on Pull: or fetch lines.
 # Use two branches completely unrelated from the arguments,
 # the clone default and one without branch properties
-for branch in master br-unconfig ; do
+for branch in main br-unconfig ; do
     echo $branch
     for remote in $remotes ; do
 	echo $branch $remote
@@ -158,7 +162,7 @@ done >> tests
 
 # Merge logic does not depend on branch properties
 # neither in the Pull: or .fetch config
-for branch in master br-unconfig ; do
+for branch in main br-unconfig ; do
     cat <<EOF
 $branch ../.git
 $branch ../.git one
@@ -188,17 +192,17 @@ do
 		cp "$expect_r" expect_r &&
 		convert_expected expect_r sed_script &&
 		{
-			echo "# $cmd"
-			set x $cmd; shift
-			git symbolic-ref HEAD refs/heads/$1 ; shift
-			rm -f .git/FETCH_HEAD
+			echo "# $cmd" &&
+			set x $cmd && shift &&
+			git symbolic-ref HEAD refs/heads/$1 && shift &&
+			rm -f .git/FETCH_HEAD &&
 			git for-each-ref \
 				refs/heads refs/remotes/rem refs/tags |
 			while read val type refname
 			do
-				git update-ref -d "$refname" "$val"
-			done
-			git fetch "$@" >/dev/null
+				git update-ref -d "$refname" "$val" || return 1
+			done &&
+			git fetch "$@" >/dev/null &&
 			cat .git/FETCH_HEAD
 		} >"$actual_f" &&
 		git show-ref >"$actual_r" &&
diff --git a/t/t5515/fetch.br-branches-default b/t/t5515/fetch.br-branches-default
index a1bc3d5..0bed09c 100644
--- a/t/t5515/fetch.br-branches-default
+++ b/t/t5515/fetch.br-branches-default
@@ -1,6 +1,6 @@
 # br-branches-default
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f		branch 'master' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+b4ab76b1a01ea602209932134a44f1e6bd610832		branch 'main' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.br-branches-default-merge b/t/t5515/fetch.br-branches-default-merge
index 12ab08e..59eef63 100644
--- a/t/t5515/fetch.br-branches-default-merge
+++ b/t/t5515/fetch.br-branches-default-merge
@@ -1,7 +1,7 @@
 # br-branches-default-merge
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b		branch 'three' of ../
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f	not-for-merge	branch 'master' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+b4ab76b1a01ea602209932134a44f1e6bd610832	not-for-merge	branch 'main' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.br-branches-default-merge_branches-default b/t/t5515/fetch.br-branches-default-merge_branches-default
index 5442752..490186c 100644
--- a/t/t5515/fetch.br-branches-default-merge_branches-default
+++ b/t/t5515/fetch.br-branches-default-merge_branches-default
@@ -1,7 +1,7 @@
 # br-branches-default-merge branches-default
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b		branch 'three' of ../
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f	not-for-merge	branch 'master' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+b4ab76b1a01ea602209932134a44f1e6bd610832	not-for-merge	branch 'main' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.br-branches-default-octopus b/t/t5515/fetch.br-branches-default-octopus
index 498a761..d484138 100644
--- a/t/t5515/fetch.br-branches-default-octopus
+++ b/t/t5515/fetch.br-branches-default-octopus
@@ -1,8 +1,8 @@
 # br-branches-default-octopus
 8e32a6d901327a23ef831511badce7bf3bf46689		branch 'one' of ../
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8		branch 'two' of ../
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f	not-for-merge	branch 'master' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+b4ab76b1a01ea602209932134a44f1e6bd610832	not-for-merge	branch 'main' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.br-branches-default-octopus_branches-default b/t/t5515/fetch.br-branches-default-octopus_branches-default
index 0857f13..b79a5fe 100644
--- a/t/t5515/fetch.br-branches-default-octopus_branches-default
+++ b/t/t5515/fetch.br-branches-default-octopus_branches-default
@@ -1,8 +1,8 @@
 # br-branches-default-octopus branches-default
 8e32a6d901327a23ef831511badce7bf3bf46689		branch 'one' of ../
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8		branch 'two' of ../
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f	not-for-merge	branch 'master' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+b4ab76b1a01ea602209932134a44f1e6bd610832	not-for-merge	branch 'main' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.br-branches-default_branches-default b/t/t5515/fetch.br-branches-default_branches-default
index 8cbd718..1c866d8 100644
--- a/t/t5515/fetch.br-branches-default_branches-default
+++ b/t/t5515/fetch.br-branches-default_branches-default
@@ -1,6 +1,6 @@
 # br-branches-default branches-default
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f		branch 'master' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+b4ab76b1a01ea602209932134a44f1e6bd610832		branch 'main' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.br-branches-one b/t/t5515/fetch.br-branches-one
index c98f670..6925a77 100644
--- a/t/t5515/fetch.br-branches-one
+++ b/t/t5515/fetch.br-branches-one
@@ -1,6 +1,6 @@
 # br-branches-one
 8e32a6d901327a23ef831511badce7bf3bf46689		branch 'one' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.br-branches-one-merge b/t/t5515/fetch.br-branches-one-merge
index 54a7742..8525703 100644
--- a/t/t5515/fetch.br-branches-one-merge
+++ b/t/t5515/fetch.br-branches-one-merge
@@ -1,7 +1,7 @@
 # br-branches-one-merge
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b		branch 'three' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	branch 'one' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.br-branches-one-merge_branches-one b/t/t5515/fetch.br-branches-one-merge_branches-one
index b4d1bb0..3a63a7f 100644
--- a/t/t5515/fetch.br-branches-one-merge_branches-one
+++ b/t/t5515/fetch.br-branches-one-merge_branches-one
@@ -1,7 +1,7 @@
 # br-branches-one-merge branches-one
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b		branch 'three' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	branch 'one' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.br-branches-one-octopus b/t/t5515/fetch.br-branches-one-octopus
index 97c4b54..46af763 100644
--- a/t/t5515/fetch.br-branches-one-octopus
+++ b/t/t5515/fetch.br-branches-one-octopus
@@ -1,7 +1,7 @@
 # br-branches-one-octopus
 8e32a6d901327a23ef831511badce7bf3bf46689		branch 'one' of ../
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8		branch 'two' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.br-branches-one-octopus_branches-one b/t/t5515/fetch.br-branches-one-octopus_branches-one
index df705f7..becfde9 100644
--- a/t/t5515/fetch.br-branches-one-octopus_branches-one
+++ b/t/t5515/fetch.br-branches-one-octopus_branches-one
@@ -1,7 +1,7 @@
 # br-branches-one-octopus branches-one
 8e32a6d901327a23ef831511badce7bf3bf46689		branch 'one' of ../
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8		branch 'two' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.br-branches-one_branches-one b/t/t5515/fetch.br-branches-one_branches-one
index 96890e5..9ba34c6 100644
--- a/t/t5515/fetch.br-branches-one_branches-one
+++ b/t/t5515/fetch.br-branches-one_branches-one
@@ -1,6 +1,6 @@
 # br-branches-one branches-one
 8e32a6d901327a23ef831511badce7bf3bf46689		branch 'one' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.br-config-explicit b/t/t5515/fetch.br-config-explicit
index 68fc927..7466a73 100644
--- a/t/t5515/fetch.br-config-explicit
+++ b/t/t5515/fetch.br-config-explicit
@@ -1,9 +1,9 @@
 # br-config-explicit
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f		branch 'master' of ../
+b4ab76b1a01ea602209932134a44f1e6bd610832		branch 'main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	branch 'one' of ../
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8	not-for-merge	branch 'two' of ../
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b	not-for-merge	branch 'three' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.br-config-explicit-merge b/t/t5515/fetch.br-config-explicit-merge
index 5ce764a..9375b7d 100644
--- a/t/t5515/fetch.br-config-explicit-merge
+++ b/t/t5515/fetch.br-config-explicit-merge
@@ -1,9 +1,9 @@
 # br-config-explicit-merge
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b		branch 'three' of ../
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f	not-for-merge	branch 'master' of ../
+b4ab76b1a01ea602209932134a44f1e6bd610832	not-for-merge	branch 'main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	branch 'one' of ../
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8	not-for-merge	branch 'two' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.br-config-explicit-merge_config-explicit b/t/t5515/fetch.br-config-explicit-merge_config-explicit
index b1152b7..6335e2b 100644
--- a/t/t5515/fetch.br-config-explicit-merge_config-explicit
+++ b/t/t5515/fetch.br-config-explicit-merge_config-explicit
@@ -1,9 +1,9 @@
 # br-config-explicit-merge config-explicit
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b		branch 'three' of ../
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f	not-for-merge	branch 'master' of ../
+b4ab76b1a01ea602209932134a44f1e6bd610832	not-for-merge	branch 'main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	branch 'one' of ../
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8	not-for-merge	branch 'two' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.br-config-explicit-octopus b/t/t5515/fetch.br-config-explicit-octopus
index 110577b..c379aa9 100644
--- a/t/t5515/fetch.br-config-explicit-octopus
+++ b/t/t5515/fetch.br-config-explicit-octopus
@@ -1,9 +1,9 @@
 # br-config-explicit-octopus
 8e32a6d901327a23ef831511badce7bf3bf46689		branch 'one' of ../
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8		branch 'two' of ../
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f	not-for-merge	branch 'master' of ../
+b4ab76b1a01ea602209932134a44f1e6bd610832	not-for-merge	branch 'main' of ../
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b	not-for-merge	branch 'three' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.br-config-explicit-octopus_config-explicit b/t/t5515/fetch.br-config-explicit-octopus_config-explicit
index a29dd8b..7fb3a3e 100644
--- a/t/t5515/fetch.br-config-explicit-octopus_config-explicit
+++ b/t/t5515/fetch.br-config-explicit-octopus_config-explicit
@@ -1,9 +1,9 @@
 # br-config-explicit-octopus config-explicit
 8e32a6d901327a23ef831511badce7bf3bf46689		branch 'one' of ../
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8		branch 'two' of ../
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f	not-for-merge	branch 'master' of ../
+b4ab76b1a01ea602209932134a44f1e6bd610832	not-for-merge	branch 'main' of ../
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b	not-for-merge	branch 'three' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.br-config-explicit_config-explicit b/t/t5515/fetch.br-config-explicit_config-explicit
index b19b016..86045a7 100644
--- a/t/t5515/fetch.br-config-explicit_config-explicit
+++ b/t/t5515/fetch.br-config-explicit_config-explicit
@@ -1,9 +1,9 @@
 # br-config-explicit config-explicit
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f		branch 'master' of ../
+b4ab76b1a01ea602209932134a44f1e6bd610832		branch 'main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	branch 'one' of ../
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8	not-for-merge	branch 'two' of ../
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b	not-for-merge	branch 'three' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.br-config-glob b/t/t5515/fetch.br-config-glob
index 946d70c..bfeef2b 100644
--- a/t/t5515/fetch.br-config-glob
+++ b/t/t5515/fetch.br-config-glob
@@ -1,9 +1,9 @@
 # br-config-glob
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f	not-for-merge	branch 'master' of ../
+b4ab76b1a01ea602209932134a44f1e6bd610832	not-for-merge	branch 'main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	branch 'one' of ../
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b	not-for-merge	branch 'three' of ../
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8	not-for-merge	branch 'two' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.br-config-glob-merge b/t/t5515/fetch.br-config-glob-merge
index 89f2596..5376a4a 100644
--- a/t/t5515/fetch.br-config-glob-merge
+++ b/t/t5515/fetch.br-config-glob-merge
@@ -1,9 +1,9 @@
 # br-config-glob-merge
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b		branch 'three' of ../
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f	not-for-merge	branch 'master' of ../
+b4ab76b1a01ea602209932134a44f1e6bd610832	not-for-merge	branch 'main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	branch 'one' of ../
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8	not-for-merge	branch 'two' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.br-config-glob-merge_config-glob b/t/t5515/fetch.br-config-glob-merge_config-glob
index 2ba4832..7dfc2fe 100644
--- a/t/t5515/fetch.br-config-glob-merge_config-glob
+++ b/t/t5515/fetch.br-config-glob-merge_config-glob
@@ -1,9 +1,9 @@
 # br-config-glob-merge config-glob
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b		branch 'three' of ../
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f	not-for-merge	branch 'master' of ../
+b4ab76b1a01ea602209932134a44f1e6bd610832	not-for-merge	branch 'main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	branch 'one' of ../
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8	not-for-merge	branch 'two' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.br-config-glob-octopus b/t/t5515/fetch.br-config-glob-octopus
index 64994df..1084030 100644
--- a/t/t5515/fetch.br-config-glob-octopus
+++ b/t/t5515/fetch.br-config-glob-octopus
@@ -1,9 +1,9 @@
 # br-config-glob-octopus
 8e32a6d901327a23ef831511badce7bf3bf46689		branch 'one' of ../
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8		branch 'two' of ../
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f	not-for-merge	branch 'master' of ../
+b4ab76b1a01ea602209932134a44f1e6bd610832	not-for-merge	branch 'main' of ../
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b	not-for-merge	branch 'three' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.br-config-glob-octopus_config-glob b/t/t5515/fetch.br-config-glob-octopus_config-glob
index 681a725..839866d 100644
--- a/t/t5515/fetch.br-config-glob-octopus_config-glob
+++ b/t/t5515/fetch.br-config-glob-octopus_config-glob
@@ -1,9 +1,9 @@
 # br-config-glob-octopus config-glob
 8e32a6d901327a23ef831511badce7bf3bf46689		branch 'one' of ../
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8		branch 'two' of ../
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f	not-for-merge	branch 'master' of ../
+b4ab76b1a01ea602209932134a44f1e6bd610832	not-for-merge	branch 'main' of ../
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b	not-for-merge	branch 'three' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.br-config-glob_config-glob b/t/t5515/fetch.br-config-glob_config-glob
index 19daf0c..7b0cb91 100644
--- a/t/t5515/fetch.br-config-glob_config-glob
+++ b/t/t5515/fetch.br-config-glob_config-glob
@@ -1,9 +1,9 @@
 # br-config-glob config-glob
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f	not-for-merge	branch 'master' of ../
+b4ab76b1a01ea602209932134a44f1e6bd610832	not-for-merge	branch 'main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	branch 'one' of ../
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b	not-for-merge	branch 'three' of ../
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8	not-for-merge	branch 'two' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.br-remote-explicit b/t/t5515/fetch.br-remote-explicit
index ab44bc5..d6619e7 100644
--- a/t/t5515/fetch.br-remote-explicit
+++ b/t/t5515/fetch.br-remote-explicit
@@ -1,9 +1,9 @@
 # br-remote-explicit
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f		branch 'master' of ../
+b4ab76b1a01ea602209932134a44f1e6bd610832		branch 'main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	branch 'one' of ../
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8	not-for-merge	branch 'two' of ../
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b	not-for-merge	branch 'three' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.br-remote-explicit-merge b/t/t5515/fetch.br-remote-explicit-merge
index d018b35..5b49b7c 100644
--- a/t/t5515/fetch.br-remote-explicit-merge
+++ b/t/t5515/fetch.br-remote-explicit-merge
@@ -1,9 +1,9 @@
 # br-remote-explicit-merge
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b		branch 'three' of ../
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f	not-for-merge	branch 'master' of ../
+b4ab76b1a01ea602209932134a44f1e6bd610832	not-for-merge	branch 'main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	branch 'one' of ../
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8	not-for-merge	branch 'two' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.br-remote-explicit-merge_remote-explicit b/t/t5515/fetch.br-remote-explicit-merge_remote-explicit
index 0d3d780..417261d 100644
--- a/t/t5515/fetch.br-remote-explicit-merge_remote-explicit
+++ b/t/t5515/fetch.br-remote-explicit-merge_remote-explicit
@@ -1,9 +1,9 @@
 # br-remote-explicit-merge remote-explicit
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b		branch 'three' of ../
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f	not-for-merge	branch 'master' of ../
+b4ab76b1a01ea602209932134a44f1e6bd610832	not-for-merge	branch 'main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	branch 'one' of ../
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8	not-for-merge	branch 'two' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.br-remote-explicit-octopus b/t/t5515/fetch.br-remote-explicit-octopus
index 6f84304..2edef64 100644
--- a/t/t5515/fetch.br-remote-explicit-octopus
+++ b/t/t5515/fetch.br-remote-explicit-octopus
@@ -1,9 +1,9 @@
 # br-remote-explicit-octopus
 8e32a6d901327a23ef831511badce7bf3bf46689		branch 'one' of ../
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8		branch 'two' of ../
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f	not-for-merge	branch 'master' of ../
+b4ab76b1a01ea602209932134a44f1e6bd610832	not-for-merge	branch 'main' of ../
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b	not-for-merge	branch 'three' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.br-remote-explicit-octopus_remote-explicit b/t/t5515/fetch.br-remote-explicit-octopus_remote-explicit
index 3546a83..ceb8752 100644
--- a/t/t5515/fetch.br-remote-explicit-octopus_remote-explicit
+++ b/t/t5515/fetch.br-remote-explicit-octopus_remote-explicit
@@ -1,9 +1,9 @@
 # br-remote-explicit-octopus remote-explicit
 8e32a6d901327a23ef831511badce7bf3bf46689		branch 'one' of ../
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8		branch 'two' of ../
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f	not-for-merge	branch 'master' of ../
+b4ab76b1a01ea602209932134a44f1e6bd610832	not-for-merge	branch 'main' of ../
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b	not-for-merge	branch 'three' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.br-remote-explicit_remote-explicit b/t/t5515/fetch.br-remote-explicit_remote-explicit
index 01e014e..b7abbd2 100644
--- a/t/t5515/fetch.br-remote-explicit_remote-explicit
+++ b/t/t5515/fetch.br-remote-explicit_remote-explicit
@@ -1,9 +1,9 @@
 # br-remote-explicit remote-explicit
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f		branch 'master' of ../
+b4ab76b1a01ea602209932134a44f1e6bd610832		branch 'main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	branch 'one' of ../
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8	not-for-merge	branch 'two' of ../
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b	not-for-merge	branch 'three' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.br-remote-glob b/t/t5515/fetch.br-remote-glob
index 09bfcee..645412c 100644
--- a/t/t5515/fetch.br-remote-glob
+++ b/t/t5515/fetch.br-remote-glob
@@ -1,9 +1,9 @@
 # br-remote-glob
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f	not-for-merge	branch 'master' of ../
+b4ab76b1a01ea602209932134a44f1e6bd610832	not-for-merge	branch 'main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	branch 'one' of ../
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b	not-for-merge	branch 'three' of ../
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8	not-for-merge	branch 'two' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.br-remote-glob-merge b/t/t5515/fetch.br-remote-glob-merge
index 7e1a433..8512cfd 100644
--- a/t/t5515/fetch.br-remote-glob-merge
+++ b/t/t5515/fetch.br-remote-glob-merge
@@ -1,9 +1,9 @@
 # br-remote-glob-merge
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b		branch 'three' of ../
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f	not-for-merge	branch 'master' of ../
+b4ab76b1a01ea602209932134a44f1e6bd610832	not-for-merge	branch 'main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	branch 'one' of ../
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8	not-for-merge	branch 'two' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.br-remote-glob-merge_remote-glob b/t/t5515/fetch.br-remote-glob-merge_remote-glob
index 53571bb..7394164 100644
--- a/t/t5515/fetch.br-remote-glob-merge_remote-glob
+++ b/t/t5515/fetch.br-remote-glob-merge_remote-glob
@@ -1,9 +1,9 @@
 # br-remote-glob-merge remote-glob
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b		branch 'three' of ../
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f	not-for-merge	branch 'master' of ../
+b4ab76b1a01ea602209932134a44f1e6bd610832	not-for-merge	branch 'main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	branch 'one' of ../
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8	not-for-merge	branch 'two' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.br-remote-glob-octopus b/t/t5515/fetch.br-remote-glob-octopus
index c7c8b6d..0ca4719 100644
--- a/t/t5515/fetch.br-remote-glob-octopus
+++ b/t/t5515/fetch.br-remote-glob-octopus
@@ -1,9 +1,9 @@
 # br-remote-glob-octopus
 8e32a6d901327a23ef831511badce7bf3bf46689		branch 'one' of ../
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8		branch 'two' of ../
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f	not-for-merge	branch 'master' of ../
+b4ab76b1a01ea602209932134a44f1e6bd610832	not-for-merge	branch 'main' of ../
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b	not-for-merge	branch 'three' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.br-remote-glob-octopus_remote-glob b/t/t5515/fetch.br-remote-glob-octopus_remote-glob
index 36076fb..7e7b0ba 100644
--- a/t/t5515/fetch.br-remote-glob-octopus_remote-glob
+++ b/t/t5515/fetch.br-remote-glob-octopus_remote-glob
@@ -1,9 +1,9 @@
 # br-remote-glob-octopus remote-glob
 8e32a6d901327a23ef831511badce7bf3bf46689		branch 'one' of ../
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8		branch 'two' of ../
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f	not-for-merge	branch 'master' of ../
+b4ab76b1a01ea602209932134a44f1e6bd610832	not-for-merge	branch 'main' of ../
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b	not-for-merge	branch 'three' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.br-remote-glob_remote-glob b/t/t5515/fetch.br-remote-glob_remote-glob
index 20ba5cb..7bae5ec 100644
--- a/t/t5515/fetch.br-remote-glob_remote-glob
+++ b/t/t5515/fetch.br-remote-glob_remote-glob
@@ -1,9 +1,9 @@
 # br-remote-glob remote-glob
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f	not-for-merge	branch 'master' of ../
+b4ab76b1a01ea602209932134a44f1e6bd610832	not-for-merge	branch 'main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	branch 'one' of ../
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b	not-for-merge	branch 'three' of ../
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8	not-for-merge	branch 'two' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.br-unconfig b/t/t5515/fetch.br-unconfig
index 887ccfc..ccaa54f 100644
--- a/t/t5515/fetch.br-unconfig
+++ b/t/t5515/fetch.br-unconfig
@@ -1,9 +1,9 @@
 # br-unconfig
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f	not-for-merge	branch 'master' of ../
+b4ab76b1a01ea602209932134a44f1e6bd610832	not-for-merge	branch 'main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	branch 'one' of ../
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b	not-for-merge	branch 'three' of ../
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8	not-for-merge	branch 'two' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.br-unconfig_--tags_.._.git b/t/t5515/fetch.br-unconfig_--tags_.._.git
index 0f70f66..3afb4f8 100644
--- a/t/t5515/fetch.br-unconfig_--tags_.._.git
+++ b/t/t5515/fetch.br-unconfig_--tags_.._.git
@@ -1,6 +1,6 @@
 # br-unconfig --tags ../.git
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b		../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.br-unconfig_.._.git_one_tag_tag-one_tag_tag-three-file b/t/t5515/fetch.br-unconfig_.._.git_one_tag_tag-one_tag_tag-three-file
index 7411536..525713a 100644
--- a/t/t5515/fetch.br-unconfig_.._.git_one_tag_tag-one_tag_tag-three-file
+++ b/t/t5515/fetch.br-unconfig_.._.git_one_tag_tag-one_tag_tag-three-file
@@ -2,7 +2,7 @@
 8e32a6d901327a23ef831511badce7bf3bf46689		branch 'one' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689		tag 'tag-one' of ../
 0e3b14047d3ee365f4f2a1b673db059c3972589c	not-for-merge	tag 'tag-three-file' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
 525b7fb068d59950d185a8779dc957c77eed73ba	not-for-merge	tag 'tag-two' of ../
diff --git a/t/t5515/fetch.br-unconfig_.._.git_tag_tag-one-tree_tag_tag-three-file b/t/t5515/fetch.br-unconfig_.._.git_tag_tag-one-tree_tag_tag-three-file
index 7726983..18c871f 100644
--- a/t/t5515/fetch.br-unconfig_.._.git_tag_tag-one-tree_tag_tag-three-file
+++ b/t/t5515/fetch.br-unconfig_.._.git_tag_tag-one-tree_tag_tag-three-file
@@ -1,7 +1,7 @@
 # br-unconfig ../.git tag tag-one-tree tag tag-three-file
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 0e3b14047d3ee365f4f2a1b673db059c3972589c	not-for-merge	tag 'tag-three-file' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
 525b7fb068d59950d185a8779dc957c77eed73ba	not-for-merge	tag 'tag-two' of ../
diff --git a/t/t5515/fetch.br-unconfig_.._.git_tag_tag-one_tag_tag-three b/t/t5515/fetch.br-unconfig_.._.git_tag_tag-one_tag_tag-three
index 7b3750c..7328d30 100644
--- a/t/t5515/fetch.br-unconfig_.._.git_tag_tag-one_tag_tag-three
+++ b/t/t5515/fetch.br-unconfig_.._.git_tag_tag-one_tag_tag-three
@@ -1,7 +1,7 @@
 # br-unconfig ../.git tag tag-one tag tag-three
 8e32a6d901327a23ef831511badce7bf3bf46689		tag 'tag-one' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899		tag 'tag-three' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 0e3b14047d3ee365f4f2a1b673db059c3972589c	not-for-merge	tag 'tag-three-file' of ../
 525b7fb068d59950d185a8779dc957c77eed73ba	not-for-merge	tag 'tag-two' of ../
diff --git a/t/t5515/fetch.br-unconfig_branches-default b/t/t5515/fetch.br-unconfig_branches-default
index da30e3c..3d82f94 100644
--- a/t/t5515/fetch.br-unconfig_branches-default
+++ b/t/t5515/fetch.br-unconfig_branches-default
@@ -1,6 +1,6 @@
 # br-unconfig branches-default
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f		branch 'master' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+b4ab76b1a01ea602209932134a44f1e6bd610832		branch 'main' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.br-unconfig_branches-one b/t/t5515/fetch.br-unconfig_branches-one
index e461431..948ed0c 100644
--- a/t/t5515/fetch.br-unconfig_branches-one
+++ b/t/t5515/fetch.br-unconfig_branches-one
@@ -1,6 +1,6 @@
 # br-unconfig branches-one
 8e32a6d901327a23ef831511badce7bf3bf46689		branch 'one' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.br-unconfig_config-explicit b/t/t5515/fetch.br-unconfig_config-explicit
index ed323c9..65aaec8 100644
--- a/t/t5515/fetch.br-unconfig_config-explicit
+++ b/t/t5515/fetch.br-unconfig_config-explicit
@@ -1,9 +1,9 @@
 # br-unconfig config-explicit
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f		branch 'master' of ../
+b4ab76b1a01ea602209932134a44f1e6bd610832		branch 'main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	branch 'one' of ../
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8	not-for-merge	branch 'two' of ../
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b	not-for-merge	branch 'three' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.br-unconfig_config-glob b/t/t5515/fetch.br-unconfig_config-glob
index 2372ed0..1aa3d45 100644
--- a/t/t5515/fetch.br-unconfig_config-glob
+++ b/t/t5515/fetch.br-unconfig_config-glob
@@ -1,9 +1,9 @@
 # br-unconfig config-glob
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f	not-for-merge	branch 'master' of ../
+b4ab76b1a01ea602209932134a44f1e6bd610832	not-for-merge	branch 'main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	branch 'one' of ../
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b	not-for-merge	branch 'three' of ../
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8	not-for-merge	branch 'two' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.br-unconfig_remote-explicit b/t/t5515/fetch.br-unconfig_remote-explicit
index 6318dd1..16438d2 100644
--- a/t/t5515/fetch.br-unconfig_remote-explicit
+++ b/t/t5515/fetch.br-unconfig_remote-explicit
@@ -1,9 +1,9 @@
 # br-unconfig remote-explicit
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f		branch 'master' of ../
+b4ab76b1a01ea602209932134a44f1e6bd610832		branch 'main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	branch 'one' of ../
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8	not-for-merge	branch 'two' of ../
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b	not-for-merge	branch 'three' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.br-unconfig_remote-glob b/t/t5515/fetch.br-unconfig_remote-glob
index 1d9afad..7a01d2e 100644
--- a/t/t5515/fetch.br-unconfig_remote-glob
+++ b/t/t5515/fetch.br-unconfig_remote-glob
@@ -1,9 +1,9 @@
 # br-unconfig remote-glob
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f	not-for-merge	branch 'master' of ../
+b4ab76b1a01ea602209932134a44f1e6bd610832	not-for-merge	branch 'main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	branch 'one' of ../
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b	not-for-merge	branch 'three' of ../
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8	not-for-merge	branch 'two' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.master b/t/t5515/fetch.main
index 9b29d67..819ed33 100644
--- a/t/t5515/fetch.master
+++ b/t/t5515/fetch.main
@@ -1,9 +1,9 @@
-# master
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f	not-for-merge	branch 'master' of ../
+# main
+b4ab76b1a01ea602209932134a44f1e6bd610832	not-for-merge	branch 'main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	branch 'one' of ../
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b	not-for-merge	branch 'three' of ../
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8	not-for-merge	branch 'two' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.master_--tags_.._.git b/t/t5515/fetch.main_--tags_.._.git
index ab473a6..ddf67a6 100644
--- a/t/t5515/fetch.master_--tags_.._.git
+++ b/t/t5515/fetch.main_--tags_.._.git
@@ -1,6 +1,6 @@
-# master --tags ../.git
+# main --tags ../.git
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b		../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.master_.._.git b/t/t5515/fetch.main_.._.git
index 66d1aad..285e57e 100644
--- a/t/t5515/fetch.master_.._.git
+++ b/t/t5515/fetch.main_.._.git
@@ -1,2 +1,2 @@
-# master ../.git
+# main ../.git
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b		../
diff --git a/t/t5515/fetch.master_.._.git_one b/t/t5515/fetch.main_.._.git_one
index 35deddb..f9f511e 100644
--- a/t/t5515/fetch.master_.._.git_one
+++ b/t/t5515/fetch.main_.._.git_one
@@ -1,2 +1,2 @@
-# master ../.git one
+# main ../.git one
 8e32a6d901327a23ef831511badce7bf3bf46689		branch 'one' of ../
diff --git a/t/t5515/fetch.master_.._.git_one_tag_tag-one_tag_tag-three-file b/t/t5515/fetch.main_.._.git_one_tag_tag-one_tag_tag-three-file
index 0672d12..187643e 100644
--- a/t/t5515/fetch.master_.._.git_one_tag_tag-one_tag_tag-three-file
+++ b/t/t5515/fetch.main_.._.git_one_tag_tag-one_tag_tag-three-file
@@ -1,8 +1,8 @@
-# master ../.git one tag tag-one tag tag-three-file
+# main ../.git one tag tag-one tag tag-three-file
 8e32a6d901327a23ef831511badce7bf3bf46689		branch 'one' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689		tag 'tag-one' of ../
 0e3b14047d3ee365f4f2a1b673db059c3972589c	not-for-merge	tag 'tag-three-file' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
 525b7fb068d59950d185a8779dc957c77eed73ba	not-for-merge	tag 'tag-two' of ../
diff --git a/t/t5515/fetch.master_.._.git_one_two b/t/t5515/fetch.main_.._.git_one_two
index 35ec578..048ad97 100644
--- a/t/t5515/fetch.master_.._.git_one_two
+++ b/t/t5515/fetch.main_.._.git_one_two
@@ -1,3 +1,3 @@
-# master ../.git one two
+# main ../.git one two
 8e32a6d901327a23ef831511badce7bf3bf46689		branch 'one' of ../
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8		branch 'two' of ../
diff --git a/t/t5515/fetch.master_.._.git_tag_tag-one-tree_tag_tag-three-file b/t/t5515/fetch.main_.._.git_tag_tag-one-tree_tag_tag-three-file
index 0fd737c..df5f2a7 100644
--- a/t/t5515/fetch.master_.._.git_tag_tag-one-tree_tag_tag-three-file
+++ b/t/t5515/fetch.main_.._.git_tag_tag-one-tree_tag_tag-three-file
@@ -1,7 +1,7 @@
-# master ../.git tag tag-one-tree tag tag-three-file
+# main ../.git tag tag-one-tree tag tag-three-file
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 0e3b14047d3ee365f4f2a1b673db059c3972589c	not-for-merge	tag 'tag-three-file' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
 525b7fb068d59950d185a8779dc957c77eed73ba	not-for-merge	tag 'tag-two' of ../
diff --git a/t/t5515/fetch.master_.._.git_tag_tag-one_tag_tag-three b/t/t5515/fetch.main_.._.git_tag_tag-one_tag_tag-three
index e488986..a40b728 100644
--- a/t/t5515/fetch.master_.._.git_tag_tag-one_tag_tag-three
+++ b/t/t5515/fetch.main_.._.git_tag_tag-one_tag_tag-three
@@ -1,7 +1,7 @@
-# master ../.git tag tag-one tag tag-three
+# main ../.git tag tag-one tag tag-three
 8e32a6d901327a23ef831511badce7bf3bf46689		tag 'tag-one' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899		tag 'tag-three' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 0e3b14047d3ee365f4f2a1b673db059c3972589c	not-for-merge	tag 'tag-three-file' of ../
 525b7fb068d59950d185a8779dc957c77eed73ba	not-for-merge	tag 'tag-two' of ../
diff --git a/t/t5515/fetch.master_branches-default b/t/t5515/fetch.main_branches-default
index 2eedd3b..e3466e8 100644
--- a/t/t5515/fetch.master_branches-default
+++ b/t/t5515/fetch.main_branches-default
@@ -1,6 +1,6 @@
-# master branches-default
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f		branch 'master' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+# main branches-default
+b4ab76b1a01ea602209932134a44f1e6bd610832		branch 'main' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.master_branches-one b/t/t5515/fetch.main_branches-one
index 901ce21..a94f11a 100644
--- a/t/t5515/fetch.master_branches-one
+++ b/t/t5515/fetch.main_branches-one
@@ -1,6 +1,6 @@
-# master branches-one
+# main branches-one
 8e32a6d901327a23ef831511badce7bf3bf46689		branch 'one' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.master_config-explicit b/t/t5515/fetch.main_config-explicit
index 251c826..16d04c1 100644
--- a/t/t5515/fetch.master_config-explicit
+++ b/t/t5515/fetch.main_config-explicit
@@ -1,9 +1,9 @@
-# master config-explicit
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f		branch 'master' of ../
+# main config-explicit
+b4ab76b1a01ea602209932134a44f1e6bd610832		branch 'main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	branch 'one' of ../
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8	not-for-merge	branch 'two' of ../
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b	not-for-merge	branch 'three' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.master_config-glob b/t/t5515/fetch.main_config-glob
index 27c158e..f6a6f56 100644
--- a/t/t5515/fetch.master_config-glob
+++ b/t/t5515/fetch.main_config-glob
@@ -1,9 +1,9 @@
-# master config-glob
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f	not-for-merge	branch 'master' of ../
+# main config-glob
+b4ab76b1a01ea602209932134a44f1e6bd610832	not-for-merge	branch 'main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	branch 'one' of ../
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b	not-for-merge	branch 'three' of ../
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8	not-for-merge	branch 'two' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.master_remote-explicit b/t/t5515/fetch.main_remote-explicit
index b3cfe6b..bf4fd65 100644
--- a/t/t5515/fetch.master_remote-explicit
+++ b/t/t5515/fetch.main_remote-explicit
@@ -1,9 +1,9 @@
-# master remote-explicit
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f		branch 'master' of ../
+# main remote-explicit
+b4ab76b1a01ea602209932134a44f1e6bd610832		branch 'main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	branch 'one' of ../
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8	not-for-merge	branch 'two' of ../
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b	not-for-merge	branch 'three' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
 8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
 22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
 c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
diff --git a/t/t5515/fetch.main_remote-glob b/t/t5515/fetch.main_remote-glob
new file mode 100644
index 0000000..91dc2e2
--- /dev/null
+++ b/t/t5515/fetch.main_remote-glob
@@ -0,0 +1,11 @@
+# main remote-glob
+b4ab76b1a01ea602209932134a44f1e6bd610832	not-for-merge	branch 'main' of ../
+8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	branch 'one' of ../
+0567da4d5edd2ff4bb292a465ba9e64dcad9536b	not-for-merge	branch 'three' of ../
+6134ee8f857693b96ff1cc98d3e2fd62b199e5a8	not-for-merge	branch 'two' of ../
+ecf3b3627b498bdcb735cc4343bf165f76964e9a	not-for-merge	tag 'tag-main' of ../
+8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
+22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
+c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
+0e3b14047d3ee365f4f2a1b673db059c3972589c	not-for-merge	tag 'tag-three-file' of ../
+525b7fb068d59950d185a8779dc957c77eed73ba	not-for-merge	tag 'tag-two' of ../
diff --git a/t/t5515/fetch.master_remote-glob b/t/t5515/fetch.master_remote-glob
deleted file mode 100644
index 118befd..0000000
--- a/t/t5515/fetch.master_remote-glob
+++ /dev/null
@@ -1,11 +0,0 @@
-# master remote-glob
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f	not-for-merge	branch 'master' of ../
-8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	branch 'one' of ../
-0567da4d5edd2ff4bb292a465ba9e64dcad9536b	not-for-merge	branch 'three' of ../
-6134ee8f857693b96ff1cc98d3e2fd62b199e5a8	not-for-merge	branch 'two' of ../
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5	not-for-merge	tag 'tag-master' of ../
-8e32a6d901327a23ef831511badce7bf3bf46689	not-for-merge	tag 'tag-one' of ../
-22feea448b023a2d864ef94b013735af34d238ba	not-for-merge	tag 'tag-one-tree' of ../
-c61a82b60967180544e3c19f819ddbd0c9f89899	not-for-merge	tag 'tag-three' of ../
-0e3b14047d3ee365f4f2a1b673db059c3972589c	not-for-merge	tag 'tag-three-file' of ../
-525b7fb068d59950d185a8779dc957c77eed73ba	not-for-merge	tag 'tag-two' of ../
diff --git a/t/t5515/refs.br-branches-default b/t/t5515/refs.br-branches-default
index 21917c1..dc4f2b7 100644
--- a/t/t5515/refs.br-branches-default
+++ b/t/t5515/refs.br-branches-default
@@ -1,10 +1,10 @@
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f refs/heads/branches-default
+b4ab76b1a01ea602209932134a44f1e6bd610832 refs/heads/branches-default
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b refs/remotes/origin/HEAD
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f refs/remotes/origin/master
+b4ab76b1a01ea602209932134a44f1e6bd610832 refs/remotes/origin/main
 8e32a6d901327a23ef831511badce7bf3bf46689 refs/remotes/origin/one
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b refs/remotes/origin/three
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8 refs/remotes/origin/two
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5 refs/tags/tag-master
+ecf3b3627b498bdcb735cc4343bf165f76964e9a refs/tags/tag-main
 8e32a6d901327a23ef831511badce7bf3bf46689 refs/tags/tag-one
 22feea448b023a2d864ef94b013735af34d238ba refs/tags/tag-one-tree
 c61a82b60967180544e3c19f819ddbd0c9f89899 refs/tags/tag-three
diff --git a/t/t5515/refs.br-branches-default-merge b/t/t5515/refs.br-branches-default-merge
index 21917c1..dc4f2b7 100644
--- a/t/t5515/refs.br-branches-default-merge
+++ b/t/t5515/refs.br-branches-default-merge
@@ -1,10 +1,10 @@
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f refs/heads/branches-default
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index 9bbbfd9..a28fa5f 100644
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index 9bbbfd9..a28fa5f 100644
--- a/t/t5515/refs.br-config-explicit_config-explicit
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index 9bbbfd9..a28fa5f 100644
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index 9bbbfd9..a28fa5f 100644
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index 9bbbfd9..a28fa5f 100644
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index 9bbbfd9..a28fa5f 100644
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index 9bbbfd9..a28fa5f 100644
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index 9bbbfd9..a28fa5f 100644
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diff --git a/t/t5515/refs.br-remote-explicit b/t/t5515/refs.br-remote-explicit
index 9bbbfd9..a28fa5f 100644
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index 9bbbfd9..a28fa5f 100644
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index 9bbbfd9..a28fa5f 100644
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index 9bbbfd9..a28fa5f 100644
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index 9bbbfd9..a28fa5f 100644
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index 9bbbfd9..a28fa5f 100644
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index 9bbbfd9..a28fa5f 100644
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 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8 refs/remotes/origin/two
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5 refs/tags/tag-master
+ecf3b3627b498bdcb735cc4343bf165f76964e9a refs/tags/tag-main
 8e32a6d901327a23ef831511badce7bf3bf46689 refs/tags/tag-one
 22feea448b023a2d864ef94b013735af34d238ba refs/tags/tag-one-tree
 c61a82b60967180544e3c19f819ddbd0c9f89899 refs/tags/tag-three
diff --git a/t/t5515/refs.main_.._.git_tag_tag-one_tag_tag-three b/t/t5515/refs.main_.._.git_tag_tag-one_tag_tag-three
new file mode 100644
index 0000000..f2ab01f
--- /dev/null
+++ b/t/t5515/refs.main_.._.git_tag_tag-one_tag_tag-three
@@ -0,0 +1,11 @@
+0567da4d5edd2ff4bb292a465ba9e64dcad9536b refs/remotes/origin/HEAD
+b4ab76b1a01ea602209932134a44f1e6bd610832 refs/remotes/origin/main
+8e32a6d901327a23ef831511badce7bf3bf46689 refs/remotes/origin/one
+0567da4d5edd2ff4bb292a465ba9e64dcad9536b refs/remotes/origin/three
+6134ee8f857693b96ff1cc98d3e2fd62b199e5a8 refs/remotes/origin/two
+ecf3b3627b498bdcb735cc4343bf165f76964e9a refs/tags/tag-main
+8e32a6d901327a23ef831511badce7bf3bf46689 refs/tags/tag-one
+22feea448b023a2d864ef94b013735af34d238ba refs/tags/tag-one-tree
+c61a82b60967180544e3c19f819ddbd0c9f89899 refs/tags/tag-three
+0e3b14047d3ee365f4f2a1b673db059c3972589c refs/tags/tag-three-file
+525b7fb068d59950d185a8779dc957c77eed73ba refs/tags/tag-two
diff --git a/t/t5515/refs.master_branches-default b/t/t5515/refs.main_branches-default
index 21917c1..dc4f2b7 100644
--- a/t/t5515/refs.master_branches-default
+++ b/t/t5515/refs.main_branches-default
@@ -1,10 +1,10 @@
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f refs/heads/branches-default
+b4ab76b1a01ea602209932134a44f1e6bd610832 refs/heads/branches-default
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b refs/remotes/origin/HEAD
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f refs/remotes/origin/master
+b4ab76b1a01ea602209932134a44f1e6bd610832 refs/remotes/origin/main
 8e32a6d901327a23ef831511badce7bf3bf46689 refs/remotes/origin/one
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b refs/remotes/origin/three
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8 refs/remotes/origin/two
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5 refs/tags/tag-master
+ecf3b3627b498bdcb735cc4343bf165f76964e9a refs/tags/tag-main
 8e32a6d901327a23ef831511badce7bf3bf46689 refs/tags/tag-one
 22feea448b023a2d864ef94b013735af34d238ba refs/tags/tag-one-tree
 c61a82b60967180544e3c19f819ddbd0c9f89899 refs/tags/tag-three
diff --git a/t/t5515/refs.master_branches-one b/t/t5515/refs.main_branches-one
index 8a705a5..e8f79bf 100644
--- a/t/t5515/refs.master_branches-one
+++ b/t/t5515/refs.main_branches-one
@@ -1,10 +1,10 @@
 8e32a6d901327a23ef831511badce7bf3bf46689 refs/heads/branches-one
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b refs/remotes/origin/HEAD
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f refs/remotes/origin/master
+b4ab76b1a01ea602209932134a44f1e6bd610832 refs/remotes/origin/main
 8e32a6d901327a23ef831511badce7bf3bf46689 refs/remotes/origin/one
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b refs/remotes/origin/three
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8 refs/remotes/origin/two
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5 refs/tags/tag-master
+ecf3b3627b498bdcb735cc4343bf165f76964e9a refs/tags/tag-main
 8e32a6d901327a23ef831511badce7bf3bf46689 refs/tags/tag-one
 22feea448b023a2d864ef94b013735af34d238ba refs/tags/tag-one-tree
 c61a82b60967180544e3c19f819ddbd0c9f89899 refs/tags/tag-three
diff --git a/t/t5515/refs.master_config-explicit b/t/t5515/refs.main_config-explicit
index 9bbbfd9..a28fa5f 100644
--- a/t/t5515/refs.master_config-explicit
+++ b/t/t5515/refs.main_config-explicit
@@ -1,13 +1,13 @@
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b refs/remotes/origin/HEAD
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f refs/remotes/origin/master
+b4ab76b1a01ea602209932134a44f1e6bd610832 refs/remotes/origin/main
 8e32a6d901327a23ef831511badce7bf3bf46689 refs/remotes/origin/one
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b refs/remotes/origin/three
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8 refs/remotes/origin/two
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f refs/remotes/rem/master
+b4ab76b1a01ea602209932134a44f1e6bd610832 refs/remotes/rem/main
 8e32a6d901327a23ef831511badce7bf3bf46689 refs/remotes/rem/one
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b refs/remotes/rem/three
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8 refs/remotes/rem/two
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5 refs/tags/tag-master
+ecf3b3627b498bdcb735cc4343bf165f76964e9a refs/tags/tag-main
 8e32a6d901327a23ef831511badce7bf3bf46689 refs/tags/tag-one
 22feea448b023a2d864ef94b013735af34d238ba refs/tags/tag-one-tree
 c61a82b60967180544e3c19f819ddbd0c9f89899 refs/tags/tag-three
diff --git a/t/t5515/refs.master_config-glob b/t/t5515/refs.main_config-glob
index 9bbbfd9..a28fa5f 100644
--- a/t/t5515/refs.master_config-glob
+++ b/t/t5515/refs.main_config-glob
@@ -1,13 +1,13 @@
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b refs/remotes/origin/HEAD
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f refs/remotes/origin/master
+b4ab76b1a01ea602209932134a44f1e6bd610832 refs/remotes/origin/main
 8e32a6d901327a23ef831511badce7bf3bf46689 refs/remotes/origin/one
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b refs/remotes/origin/three
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8 refs/remotes/origin/two
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f refs/remotes/rem/master
+b4ab76b1a01ea602209932134a44f1e6bd610832 refs/remotes/rem/main
 8e32a6d901327a23ef831511badce7bf3bf46689 refs/remotes/rem/one
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b refs/remotes/rem/three
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8 refs/remotes/rem/two
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5 refs/tags/tag-master
+ecf3b3627b498bdcb735cc4343bf165f76964e9a refs/tags/tag-main
 8e32a6d901327a23ef831511badce7bf3bf46689 refs/tags/tag-one
 22feea448b023a2d864ef94b013735af34d238ba refs/tags/tag-one-tree
 c61a82b60967180544e3c19f819ddbd0c9f89899 refs/tags/tag-three
diff --git a/t/t5515/refs.master_remote-explicit b/t/t5515/refs.main_remote-explicit
index 9bbbfd9..a28fa5f 100644
--- a/t/t5515/refs.master_remote-explicit
+++ b/t/t5515/refs.main_remote-explicit
@@ -1,13 +1,13 @@
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b refs/remotes/origin/HEAD
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f refs/remotes/origin/master
+b4ab76b1a01ea602209932134a44f1e6bd610832 refs/remotes/origin/main
 8e32a6d901327a23ef831511badce7bf3bf46689 refs/remotes/origin/one
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b refs/remotes/origin/three
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8 refs/remotes/origin/two
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f refs/remotes/rem/master
+b4ab76b1a01ea602209932134a44f1e6bd610832 refs/remotes/rem/main
 8e32a6d901327a23ef831511badce7bf3bf46689 refs/remotes/rem/one
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b refs/remotes/rem/three
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8 refs/remotes/rem/two
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5 refs/tags/tag-master
+ecf3b3627b498bdcb735cc4343bf165f76964e9a refs/tags/tag-main
 8e32a6d901327a23ef831511badce7bf3bf46689 refs/tags/tag-one
 22feea448b023a2d864ef94b013735af34d238ba refs/tags/tag-one-tree
 c61a82b60967180544e3c19f819ddbd0c9f89899 refs/tags/tag-three
diff --git a/t/t5515/refs.master_remote-glob b/t/t5515/refs.main_remote-glob
index 9bbbfd9..a28fa5f 100644
--- a/t/t5515/refs.master_remote-glob
+++ b/t/t5515/refs.main_remote-glob
@@ -1,13 +1,13 @@
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b refs/remotes/origin/HEAD
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f refs/remotes/origin/master
+b4ab76b1a01ea602209932134a44f1e6bd610832 refs/remotes/origin/main
 8e32a6d901327a23ef831511badce7bf3bf46689 refs/remotes/origin/one
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b refs/remotes/origin/three
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8 refs/remotes/origin/two
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f refs/remotes/rem/master
+b4ab76b1a01ea602209932134a44f1e6bd610832 refs/remotes/rem/main
 8e32a6d901327a23ef831511badce7bf3bf46689 refs/remotes/rem/one
 0567da4d5edd2ff4bb292a465ba9e64dcad9536b refs/remotes/rem/three
 6134ee8f857693b96ff1cc98d3e2fd62b199e5a8 refs/remotes/rem/two
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5 refs/tags/tag-master
+ecf3b3627b498bdcb735cc4343bf165f76964e9a refs/tags/tag-main
 8e32a6d901327a23ef831511badce7bf3bf46689 refs/tags/tag-one
 22feea448b023a2d864ef94b013735af34d238ba refs/tags/tag-one-tree
 c61a82b60967180544e3c19f819ddbd0c9f89899 refs/tags/tag-three
diff --git a/t/t5515/refs.master_.._.git_tag_tag-one_tag_tag-three b/t/t5515/refs.master_.._.git_tag_tag-one_tag_tag-three
deleted file mode 100644
index 13e4ad2..0000000
--- a/t/t5515/refs.master_.._.git_tag_tag-one_tag_tag-three
+++ /dev/null
@@ -1,11 +0,0 @@
-0567da4d5edd2ff4bb292a465ba9e64dcad9536b refs/remotes/origin/HEAD
-754b754407bf032e9a2f9d5a9ad05ca79a6b228f refs/remotes/origin/master
-8e32a6d901327a23ef831511badce7bf3bf46689 refs/remotes/origin/one
-0567da4d5edd2ff4bb292a465ba9e64dcad9536b refs/remotes/origin/three
-6134ee8f857693b96ff1cc98d3e2fd62b199e5a8 refs/remotes/origin/two
-6c9dec2b923228c9ff994c6cfe4ae16c12408dc5 refs/tags/tag-master
-8e32a6d901327a23ef831511badce7bf3bf46689 refs/tags/tag-one
-22feea448b023a2d864ef94b013735af34d238ba refs/tags/tag-one-tree
-c61a82b60967180544e3c19f819ddbd0c9f89899 refs/tags/tag-three
-0e3b14047d3ee365f4f2a1b673db059c3972589c refs/tags/tag-three-file
-525b7fb068d59950d185a8779dc957c77eed73ba refs/tags/tag-two
diff --git a/t/t5516-fetch-push.sh b/t/t5516-fetch-push.sh
index 36ad20a..2e7c0e1 100755
--- a/t/t5516-fetch-push.sh
+++ b/t/t5516-fetch-push.sh
@@ -12,22 +12,24 @@ This test checks the following functionality:
 * --porcelain output format
 * hiderefs
 * reflogs
+* URL validation
 '
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_CREATE_REPO_NO_TEMPLATE=1
 . ./test-lib.sh
 
 D=$(pwd)
 
 mk_empty () {
 	repo_name="$1"
-	rm -fr "$repo_name" &&
-	mkdir "$repo_name" &&
-	(
-		cd "$repo_name" &&
-		git init &&
-		git config receive.denyCurrentBranch warn &&
-		mv .git/hooks .git/hooks-disabled
-	)
+	test_when_finished "rm -rf \"$repo_name\"" &&
+	test_path_is_missing "$repo_name" &&
+	git init --template= "$repo_name" &&
+	mkdir "$repo_name"/.git/hooks &&
+	git -C "$repo_name" config receive.denyCurrentBranch warn
 }
 
 mk_test () {
@@ -56,41 +58,29 @@ mk_test () {
 mk_test_with_hooks() {
 	repo_name=$1
 	mk_test "$@" &&
-	(
-		cd "$repo_name" &&
-		mkdir .git/hooks &&
-		cd .git/hooks &&
-
-		cat >pre-receive <<-'EOF' &&
-		#!/bin/sh
-		cat - >>pre-receive.actual
-		EOF
-
-		cat >update <<-'EOF' &&
-		#!/bin/sh
-		printf "%s %s %s\n" "$@" >>update.actual
-		EOF
-
-		cat >post-receive <<-'EOF' &&
-		#!/bin/sh
-		cat - >>post-receive.actual
-		EOF
-
-		cat >post-update <<-'EOF' &&
-		#!/bin/sh
-		for ref in "$@"
-		do
-			printf "%s\n" "$ref" >>post-update.actual
-		done
-		EOF
-
-		chmod +x pre-receive update post-receive post-update
-	)
+	test_hook -C "$repo_name" pre-receive <<-'EOF' &&
+	cat - >>pre-receive.actual
+	EOF
+
+	test_hook -C "$repo_name" update <<-'EOF' &&
+	printf "%s %s %s\n" "$@" >>update.actual
+	EOF
+
+	test_hook -C "$repo_name" post-receive <<-'EOF' &&
+	cat - >>post-receive.actual
+	EOF
+
+	test_hook -C "$repo_name" post-update <<-'EOF'
+	for ref in "$@"
+	do
+		printf "%s\n" "$ref" >>post-update.actual
+	done
+	EOF
 }
 
 mk_child() {
-	rm -rf "$2" &&
-	git clone "$1" "$2"
+	test_when_finished "rm -rf \"$2\"" &&
+	git clone --template= "$1" "$2"
 }
 
 check_push_result () {
@@ -120,23 +110,34 @@ test_expect_success setup '
 	git add path1 &&
 	test_tick &&
 	git commit -a -m repo &&
-	the_first_commit=$(git show-ref -s --verify refs/heads/master) &&
+	the_first_commit=$(git show-ref -s --verify refs/heads/main) &&
 
 	>path2 &&
 	git add path2 &&
 	test_tick &&
 	git commit -a -m second &&
-	the_commit=$(git show-ref -s --verify refs/heads/master)
+	the_commit=$(git show-ref -s --verify refs/heads/main)
 
 '
 
+for cmd in push fetch
+do
+	for opt in ipv4 ipv6
+	do
+		test_expect_success "reject 'git $cmd --no-$opt'" '
+			test_must_fail git $cmd --no-$opt 2>err &&
+			grep "unknown option .no-$opt" err
+		'
+	done
+done
+
 test_expect_success 'fetch without wildcard' '
 	mk_empty testrepo &&
 	(
 		cd testrepo &&
-		git fetch .. refs/heads/master:refs/remotes/origin/master &&
+		git fetch .. refs/heads/main:refs/remotes/origin/main &&
 
-		echo "$the_commit commit	refs/remotes/origin/master" >expect &&
+		echo "$the_commit commit	refs/remotes/origin/main" >expect &&
 		git for-each-ref refs/remotes/origin >actual &&
 		test_cmp expect actual
 	)
@@ -150,7 +151,7 @@ test_expect_success 'fetch with wildcard' '
 		git config remote.up.fetch "refs/heads/*:refs/remotes/origin/*" &&
 		git fetch up &&
 
-		echo "$the_commit commit	refs/remotes/origin/master" >expect &&
+		echo "$the_commit commit	refs/remotes/origin/main" >expect &&
 		git for-each-ref refs/remotes/origin >actual &&
 		test_cmp expect actual
 	)
@@ -166,7 +167,7 @@ test_expect_success 'fetch with insteadOf' '
 		git config remote.up.fetch "refs/heads/*:refs/remotes/origin/*" &&
 		git fetch up &&
 
-		echo "$the_commit commit	refs/remotes/origin/master" >expect &&
+		echo "$the_commit commit	refs/remotes/origin/main" >expect &&
 		git for-each-ref refs/remotes/origin >actual &&
 		test_cmp expect actual
 	)
@@ -182,19 +183,76 @@ test_expect_success 'fetch with pushInsteadOf (should not rewrite)' '
 		git config remote.up.fetch "refs/heads/*:refs/remotes/origin/*" &&
 		git fetch up &&
 
-		echo "$the_commit commit	refs/remotes/origin/master" >expect &&
+		echo "$the_commit commit	refs/remotes/origin/main" >expect &&
 		git for-each-ref refs/remotes/origin >actual &&
 		test_cmp expect actual
 	)
 '
 
+grep_wrote () {
+	object_count=$1
+	file_name=$2
+	grep 'write_pack_file/wrote.*"value":"'$1'"' $2
+}
+
+test_expect_success 'push without negotiation' '
+	mk_empty testrepo &&
+	git push testrepo $the_first_commit:refs/remotes/origin/first_commit &&
+	test_commit -C testrepo unrelated_commit &&
+	git -C testrepo config receive.hideRefs refs/remotes/origin/first_commit &&
+	test_when_finished "rm event" &&
+	GIT_TRACE2_EVENT="$(pwd)/event" git -c protocol.version=2 push testrepo refs/heads/main:refs/remotes/origin/main &&
+	grep_wrote 5 event # 2 commits, 2 trees, 1 blob
+'
+
+test_expect_success 'push with negotiation' '
+	mk_empty testrepo &&
+	git push testrepo $the_first_commit:refs/remotes/origin/first_commit &&
+	test_commit -C testrepo unrelated_commit &&
+	git -C testrepo config receive.hideRefs refs/remotes/origin/first_commit &&
+	test_when_finished "rm event" &&
+	GIT_TRACE2_EVENT="$(pwd)/event" \
+		git -c protocol.version=2 -c push.negotiate=1 \
+		push testrepo refs/heads/main:refs/remotes/origin/main &&
+	grep \"key\":\"total_rounds\",\"value\":\"1\" event &&
+	grep_wrote 2 event # 1 commit, 1 tree
+'
+
+test_expect_success 'push with negotiation proceeds anyway even if negotiation fails' '
+	mk_empty testrepo &&
+	git push testrepo $the_first_commit:refs/remotes/origin/first_commit &&
+	test_commit -C testrepo unrelated_commit &&
+	git -C testrepo config receive.hideRefs refs/remotes/origin/first_commit &&
+	test_when_finished "rm event" &&
+	GIT_TEST_PROTOCOL_VERSION=0 GIT_TRACE2_EVENT="$(pwd)/event" \
+		git -c push.negotiate=1 push testrepo refs/heads/main:refs/remotes/origin/main 2>err &&
+	grep_wrote 5 event && # 2 commits, 2 trees, 1 blob
+	test_grep "push negotiation failed" err
+'
+
+test_expect_success 'push with negotiation does not attempt to fetch submodules' '
+	mk_empty submodule_upstream &&
+	test_commit -C submodule_upstream submodule_commit &&
+	test_config_global protocol.file.allow always &&
+	git submodule add ./submodule_upstream submodule &&
+	mk_empty testrepo &&
+	git push testrepo $the_first_commit:refs/remotes/origin/first_commit &&
+	test_commit -C testrepo unrelated_commit &&
+	git -C testrepo config receive.hideRefs refs/remotes/origin/first_commit &&
+	GIT_TRACE2_EVENT="$(pwd)/event"  git -c submodule.recurse=true \
+		-c protocol.version=2 -c push.negotiate=1 \
+		push testrepo refs/heads/main:refs/remotes/origin/main 2>err &&
+	grep \"key\":\"total_rounds\",\"value\":\"1\" event &&
+	! grep "Fetching submodule" err
+'
+
 test_expect_success 'push without wildcard' '
 	mk_empty testrepo &&
 
-	git push testrepo refs/heads/master:refs/remotes/origin/master &&
+	git push testrepo refs/heads/main:refs/remotes/origin/main &&
 	(
 		cd testrepo &&
-		echo "$the_commit commit	refs/remotes/origin/master" >expect &&
+		echo "$the_commit commit	refs/remotes/origin/main" >expect &&
 		git for-each-ref refs/remotes/origin >actual &&
 		test_cmp expect actual
 	)
@@ -206,7 +264,7 @@ test_expect_success 'push with wildcard' '
 	git push testrepo "refs/heads/*:refs/remotes/origin/*" &&
 	(
 		cd testrepo &&
-		echo "$the_commit commit	refs/remotes/origin/master" >expect &&
+		echo "$the_commit commit	refs/remotes/origin/main" >expect &&
 		git for-each-ref refs/remotes/origin >actual &&
 		test_cmp expect actual
 	)
@@ -216,10 +274,10 @@ test_expect_success 'push with insteadOf' '
 	mk_empty testrepo &&
 	TRASH="$(pwd)/" &&
 	test_config "url.$TRASH.insteadOf" trash/ &&
-	git push trash/testrepo refs/heads/master:refs/remotes/origin/master &&
+	git push trash/testrepo refs/heads/main:refs/remotes/origin/main &&
 	(
 		cd testrepo &&
-		echo "$the_commit commit	refs/remotes/origin/master" >expect &&
+		echo "$the_commit commit	refs/remotes/origin/main" >expect &&
 		git for-each-ref refs/remotes/origin >actual &&
 		test_cmp expect actual
 	)
@@ -229,10 +287,10 @@ test_expect_success 'push with pushInsteadOf' '
 	mk_empty testrepo &&
 	TRASH="$(pwd)/" &&
 	test_config "url.$TRASH.pushInsteadOf" trash/ &&
-	git push trash/testrepo refs/heads/master:refs/remotes/origin/master &&
+	git push trash/testrepo refs/heads/main:refs/remotes/origin/main &&
 	(
 		cd testrepo &&
-		echo "$the_commit commit	refs/remotes/origin/master" >expect &&
+		echo "$the_commit commit	refs/remotes/origin/main" >expect &&
 		git for-each-ref refs/remotes/origin >actual &&
 		test_cmp expect actual
 	)
@@ -244,10 +302,10 @@ test_expect_success 'push with pushInsteadOf and explicit pushurl (pushInsteadOf
 	test_config "url.trash3/.pushInsteadOf" trash/wrong &&
 	test_config remote.r.url trash/wrong &&
 	test_config remote.r.pushurl "testrepo/" &&
-	git push r refs/heads/master:refs/remotes/origin/master &&
+	git push r refs/heads/main:refs/remotes/origin/main &&
 	(
 		cd testrepo &&
-		echo "$the_commit commit	refs/remotes/origin/master" >expect &&
+		echo "$the_commit commit	refs/remotes/origin/main" >expect &&
 		git for-each-ref refs/remotes/origin >actual &&
 		test_cmp expect actual
 	)
@@ -255,109 +313,114 @@ test_expect_success 'push with pushInsteadOf and explicit pushurl (pushInsteadOf
 
 test_expect_success 'push with matching heads' '
 
-	mk_test testrepo heads/master &&
+	mk_test testrepo heads/main &&
 	git push testrepo : &&
-	check_push_result testrepo $the_commit heads/master
+	check_push_result testrepo $the_commit heads/main
 
 '
 
 test_expect_success 'push with matching heads on the command line' '
 
-	mk_test testrepo heads/master &&
+	mk_test testrepo heads/main &&
 	git push testrepo : &&
-	check_push_result testrepo $the_commit heads/master
+	check_push_result testrepo $the_commit heads/main
 
 '
 
 test_expect_success 'failed (non-fast-forward) push with matching heads' '
 
-	mk_test testrepo heads/master &&
+	mk_test testrepo heads/main &&
 	git push testrepo : &&
 	git commit --amend -massaged &&
 	test_must_fail git push testrepo &&
-	check_push_result testrepo $the_commit heads/master &&
+	check_push_result testrepo $the_commit heads/main &&
 	git reset --hard $the_commit
 
 '
 
 test_expect_success 'push --force with matching heads' '
 
-	mk_test testrepo heads/master &&
+	mk_test testrepo heads/main &&
 	git push testrepo : &&
 	git commit --amend -massaged &&
 	git push --force testrepo : &&
-	! check_push_result testrepo $the_commit heads/master &&
+	! check_push_result testrepo $the_commit heads/main &&
 	git reset --hard $the_commit
 
 '
 
 test_expect_success 'push with matching heads and forced update' '
 
-	mk_test testrepo heads/master &&
+	mk_test testrepo heads/main &&
 	git push testrepo : &&
 	git commit --amend -massaged &&
 	git push testrepo +: &&
-	! check_push_result testrepo $the_commit heads/master &&
+	! check_push_result testrepo $the_commit heads/main &&
 	git reset --hard $the_commit
 
 '
 
 test_expect_success 'push with no ambiguity (1)' '
 
-	mk_test testrepo heads/master &&
-	git push testrepo master:master &&
-	check_push_result testrepo $the_commit heads/master
+	mk_test testrepo heads/main &&
+	git push testrepo main:main &&
+	check_push_result testrepo $the_commit heads/main
 
 '
 
 test_expect_success 'push with no ambiguity (2)' '
 
-	mk_test testrepo remotes/origin/master &&
-	git push testrepo master:origin/master &&
-	check_push_result testrepo $the_commit remotes/origin/master
+	mk_test testrepo remotes/origin/main &&
+	git push testrepo main:origin/main &&
+	check_push_result testrepo $the_commit remotes/origin/main
 
 '
 
 test_expect_success 'push with colon-less refspec, no ambiguity' '
 
-	mk_test testrepo heads/master heads/t/master &&
-	git branch -f t/master master &&
-	git push testrepo master &&
-	check_push_result testrepo $the_commit heads/master &&
-	check_push_result testrepo $the_first_commit heads/t/master
+	mk_test testrepo heads/main heads/t/main &&
+	git branch -f t/main main &&
+	git push testrepo main &&
+	check_push_result testrepo $the_commit heads/main &&
+	check_push_result testrepo $the_first_commit heads/t/main
 
 '
 
 test_expect_success 'push with weak ambiguity (1)' '
 
-	mk_test testrepo heads/master remotes/origin/master &&
-	git push testrepo master:master &&
-	check_push_result testrepo $the_commit heads/master &&
-	check_push_result testrepo $the_first_commit remotes/origin/master
+	mk_test testrepo heads/main remotes/origin/main &&
+	git push testrepo main:main &&
+	check_push_result testrepo $the_commit heads/main &&
+	check_push_result testrepo $the_first_commit remotes/origin/main
 
 '
 
 test_expect_success 'push with weak ambiguity (2)' '
 
-	mk_test testrepo heads/master remotes/origin/master remotes/another/master &&
-	git push testrepo master:master &&
-	check_push_result testrepo $the_commit heads/master &&
-	check_push_result testrepo $the_first_commit remotes/origin/master remotes/another/master
+	mk_test testrepo heads/main remotes/origin/main remotes/another/main &&
+	git push testrepo main:main &&
+	check_push_result testrepo $the_commit heads/main &&
+	check_push_result testrepo $the_first_commit remotes/origin/main remotes/another/main
 
 '
 
 test_expect_success 'push with ambiguity' '
 
 	mk_test testrepo heads/frotz tags/frotz &&
-	test_must_fail git push testrepo master:frotz &&
+	test_must_fail git push testrepo main:frotz &&
 	check_push_result testrepo $the_first_commit heads/frotz tags/frotz
 
 '
 
+test_expect_success 'push with onelevel ref' '
+	mk_test testrepo heads/main &&
+	test_must_fail git push testrepo HEAD:refs/onelevel
+'
+
 test_expect_success 'push with colon-less refspec (1)' '
 
 	mk_test testrepo heads/frotz tags/frotz &&
-	git branch -f frotz master &&
+	git branch -f frotz main &&
 	git push testrepo frotz &&
 	check_push_result testrepo $the_commit heads/frotz &&
 	check_push_result testrepo $the_first_commit tags/frotz
@@ -385,7 +448,7 @@ test_expect_success 'push with colon-less refspec (3)' '
 	then
 		git tag -d frotz
 	fi &&
-	git branch -f frotz master &&
+	git branch -f frotz main &&
 	git push testrepo frotz &&
 	check_push_result testrepo $the_commit heads/frotz &&
 	test 1 = $( cd testrepo && git show-ref | wc -l )
@@ -408,7 +471,7 @@ test_expect_success 'push with colon-less refspec (4)' '
 test_expect_success 'push head with non-existent, incomplete dest' '
 
 	mk_test testrepo &&
-	git push testrepo master:branch &&
+	git push testrepo main:branch &&
 	check_push_result testrepo $the_commit heads/branch
 
 '
@@ -425,236 +488,263 @@ test_expect_success 'push tag with non-existent, incomplete dest' '
 test_expect_success 'push sha1 with non-existent, incomplete dest' '
 
 	mk_test testrepo &&
-	test_must_fail git push testrepo $(git rev-parse master):foo
+	test_must_fail git push testrepo $(git rev-parse main):foo
 
 '
 
 test_expect_success 'push ref expression with non-existent, incomplete dest' '
 
 	mk_test testrepo &&
-	test_must_fail git push testrepo master^:branch
+	test_must_fail git push testrepo main^:branch
 
 '
 
-test_expect_success 'push with HEAD' '
-
-	mk_test testrepo heads/master &&
-	git checkout master &&
-	git push testrepo HEAD &&
-	check_push_result testrepo $the_commit heads/master
-
-'
-
-test_expect_success 'push with HEAD nonexisting at remote' '
-
-	mk_test testrepo heads/master &&
-	git checkout -b local master &&
-	git push testrepo HEAD &&
-	check_push_result testrepo $the_commit heads/local
-'
-
-test_expect_success 'push with +HEAD' '
-
-	mk_test testrepo heads/master &&
-	git checkout master &&
-	git branch -D local &&
-	git checkout -b local &&
-	git push testrepo master local &&
-	check_push_result testrepo $the_commit heads/master &&
-	check_push_result testrepo $the_commit heads/local &&
+for head in HEAD @
+do
 
-	# Without force rewinding should fail
-	git reset --hard HEAD^ &&
-	test_must_fail git push testrepo HEAD &&
-	check_push_result testrepo $the_commit heads/local &&
+	test_expect_success "push with $head" '
+		mk_test testrepo heads/main &&
+		git checkout main &&
+		git push testrepo $head &&
+		check_push_result testrepo $the_commit heads/main
+	'
 
-	# With force rewinding should succeed
-	git push testrepo +HEAD &&
-	check_push_result testrepo $the_first_commit heads/local
+	test_expect_success "push with $head nonexisting at remote" '
+		mk_test testrepo heads/main &&
+		git checkout -b local main &&
+		test_when_finished "git checkout main; git branch -D local" &&
+		git push testrepo $head &&
+		check_push_result testrepo $the_commit heads/local
+	'
 
-'
+	test_expect_success "push with +$head" '
+		mk_test testrepo heads/main &&
+		git checkout -b local main &&
+		test_when_finished "git checkout main; git branch -D local" &&
+		git push testrepo main local &&
+		check_push_result testrepo $the_commit heads/main &&
+		check_push_result testrepo $the_commit heads/local &&
+
+		# Without force rewinding should fail
+		git reset --hard $head^ &&
+		test_must_fail git push testrepo $head &&
+		check_push_result testrepo $the_commit heads/local &&
+
+		# With force rewinding should succeed
+		git push testrepo +$head &&
+		check_push_result testrepo $the_first_commit heads/local
+	'
 
-test_expect_success 'push HEAD with non-existent, incomplete dest' '
+	test_expect_success "push $head with non-existent, incomplete dest" '
+		mk_test testrepo &&
+		git checkout main &&
+		git push testrepo $head:branch &&
+		check_push_result testrepo $the_commit heads/branch
 
-	mk_test testrepo &&
-	git checkout master &&
-	git push testrepo HEAD:branch &&
-	check_push_result testrepo $the_commit heads/branch
+	'
 
-'
+	test_expect_success "push with config remote.*.push = $head" '
+		mk_test testrepo heads/local &&
+		git checkout main &&
+		git branch -f local $the_commit &&
+		test_when_finished "git branch -D local" &&
+		(
+			cd testrepo &&
+			git checkout local &&
+			git reset --hard $the_first_commit
+		) &&
+		test_config remote.there.url testrepo &&
+		test_config remote.there.push $head &&
+		test_config branch.main.remote there &&
+		git push &&
+		check_push_result testrepo $the_commit heads/main &&
+		check_push_result testrepo $the_first_commit heads/local
+	'
 
-test_expect_success 'push with config remote.*.push = HEAD' '
+done
 
-	mk_test testrepo heads/local &&
-	git checkout master &&
-	git branch -f local $the_commit &&
-	(
-		cd testrepo &&
-		git checkout local &&
-		git reset --hard $the_first_commit
-	) &&
+test_expect_success "push to remote with no explicit refspec and config remote.*.push = src:dest" '
+	mk_test testrepo heads/main &&
+	git checkout $the_first_commit &&
 	test_config remote.there.url testrepo &&
-	test_config remote.there.push HEAD &&
-	test_config branch.master.remote there &&
-	git push &&
-	check_push_result testrepo $the_commit heads/master &&
-	check_push_result testrepo $the_first_commit heads/local
+	test_config remote.there.push refs/heads/main:refs/heads/main &&
+	git push there &&
+	check_push_result testrepo $the_commit heads/main
 '
 
 test_expect_success 'push with remote.pushdefault' '
-	mk_test up_repo heads/master &&
-	mk_test down_repo heads/master &&
+	mk_test up_repo heads/main &&
+	mk_test down_repo heads/main &&
 	test_config remote.up.url up_repo &&
 	test_config remote.down.url down_repo &&
-	test_config branch.master.remote up &&
+	test_config branch.main.remote up &&
 	test_config remote.pushdefault down &&
 	test_config push.default matching &&
 	git push &&
-	check_push_result up_repo $the_first_commit heads/master &&
-	check_push_result down_repo $the_commit heads/master
+	check_push_result up_repo $the_first_commit heads/main &&
+	check_push_result down_repo $the_commit heads/main
 '
 
 test_expect_success 'push with config remote.*.pushurl' '
 
-	mk_test testrepo heads/master &&
-	git checkout master &&
+	mk_test testrepo heads/main &&
+	git checkout main &&
 	test_config remote.there.url test2repo &&
 	test_config remote.there.pushurl testrepo &&
 	git push there : &&
-	check_push_result testrepo $the_commit heads/master
+	check_push_result testrepo $the_commit heads/main
 '
 
 test_expect_success 'push with config branch.*.pushremote' '
-	mk_test up_repo heads/master &&
-	mk_test side_repo heads/master &&
-	mk_test down_repo heads/master &&
+	mk_test up_repo heads/main &&
+	mk_test side_repo heads/main &&
+	mk_test down_repo heads/main &&
 	test_config remote.up.url up_repo &&
 	test_config remote.pushdefault side_repo &&
 	test_config remote.down.url down_repo &&
-	test_config branch.master.remote up &&
-	test_config branch.master.pushremote down &&
+	test_config branch.main.remote up &&
+	test_config branch.main.pushremote down &&
 	test_config push.default matching &&
 	git push &&
-	check_push_result up_repo $the_first_commit heads/master &&
-	check_push_result side_repo $the_first_commit heads/master &&
-	check_push_result down_repo $the_commit heads/master
+	check_push_result up_repo $the_first_commit heads/main &&
+	check_push_result side_repo $the_first_commit heads/main &&
+	check_push_result down_repo $the_commit heads/main
 '
 
 test_expect_success 'branch.*.pushremote config order is irrelevant' '
-	mk_test one_repo heads/master &&
-	mk_test two_repo heads/master &&
+	mk_test one_repo heads/main &&
+	mk_test two_repo heads/main &&
 	test_config remote.one.url one_repo &&
 	test_config remote.two.url two_repo &&
-	test_config branch.master.pushremote two_repo &&
+	test_config branch.main.pushremote two_repo &&
 	test_config remote.pushdefault one_repo &&
 	test_config push.default matching &&
 	git push &&
-	check_push_result one_repo $the_first_commit heads/master &&
-	check_push_result two_repo $the_commit heads/master
+	check_push_result one_repo $the_first_commit heads/main &&
+	check_push_result two_repo $the_commit heads/main
+'
+
+test_expect_success 'push rejects empty branch name entries' '
+	mk_test one_repo heads/main &&
+	test_config remote.one.url one_repo &&
+	test_config branch..remote one &&
+	test_config branch..merge refs/heads/ &&
+	test_config branch.main.remote one &&
+	test_config branch.main.merge refs/heads/main &&
+	test_must_fail git push 2>err &&
+	grep "bad config variable .branch\.\." err
+'
+
+test_expect_success 'push ignores "branch." config without subsection' '
+	mk_test one_repo heads/main &&
+	test_config remote.one.url one_repo &&
+	test_config branch.autoSetupMerge true &&
+	test_config branch.main.remote one &&
+	test_config branch.main.merge refs/heads/main &&
+	git push
 '
 
 test_expect_success 'push with dry-run' '
 
-	mk_test testrepo heads/master &&
-	old_commit=$(git -C testrepo show-ref -s --verify refs/heads/master) &&
+	mk_test testrepo heads/main &&
+	old_commit=$(git -C testrepo show-ref -s --verify refs/heads/main) &&
 	git push --dry-run testrepo : &&
-	check_push_result testrepo $old_commit heads/master
+	check_push_result testrepo $old_commit heads/main
 '
 
 test_expect_success 'push updates local refs' '
 
-	mk_test testrepo heads/master &&
+	mk_test testrepo heads/main &&
 	mk_child testrepo child &&
 	(
 		cd child &&
-		git pull .. master &&
+		git pull .. main &&
 		git push &&
-		test $(git rev-parse master) = \
-			$(git rev-parse remotes/origin/master)
+		test $(git rev-parse main) = \
+			$(git rev-parse remotes/origin/main)
 	)
 
 '
 
 test_expect_success 'push updates up-to-date local refs' '
 
-	mk_test testrepo heads/master &&
+	mk_test testrepo heads/main &&
 	mk_child testrepo child1 &&
 	mk_child testrepo child2 &&
-	(cd child1 && git pull .. master && git push) &&
+	(cd child1 && git pull .. main && git push) &&
 	(
 		cd child2 &&
-		git pull ../child1 master &&
+		git pull ../child1 main &&
 		git push &&
-		test $(git rev-parse master) = \
-			$(git rev-parse remotes/origin/master)
+		test $(git rev-parse main) = \
+			$(git rev-parse remotes/origin/main)
 	)
 
 '
 
 test_expect_success 'push preserves up-to-date packed refs' '
 
-	mk_test testrepo heads/master &&
+	mk_test testrepo heads/main &&
 	mk_child testrepo child &&
 	(
 		cd child &&
 		git push &&
-		! test -f .git/refs/remotes/origin/master
+		! test -f .git/refs/remotes/origin/main
 	)
 
 '
 
 test_expect_success 'push does not update local refs on failure' '
 
-	mk_test testrepo heads/master &&
+	mk_test testrepo heads/main &&
 	mk_child testrepo child &&
-	mkdir testrepo/.git/hooks &&
 	echo "#!/no/frobnication/today" >testrepo/.git/hooks/pre-receive &&
 	chmod +x testrepo/.git/hooks/pre-receive &&
 	(
 		cd child &&
-		git pull .. master &&
+		git pull .. main &&
 		test_must_fail git push &&
-		test $(git rev-parse master) != \
-			$(git rev-parse remotes/origin/master)
+		test $(git rev-parse main) != \
+			$(git rev-parse remotes/origin/main)
 	)
 
 '
 
 test_expect_success 'allow deleting an invalid remote ref' '
 
-	mk_test testrepo heads/master &&
+	mk_test testrepo heads/branch &&
 	rm -f testrepo/.git/objects/??/* &&
-	git push testrepo :refs/heads/master &&
-	(cd testrepo && test_must_fail git rev-parse --verify refs/heads/master)
+	git push testrepo :refs/heads/branch &&
+	(cd testrepo && test_must_fail git rev-parse --verify refs/heads/branch)
 
 '
 
 test_expect_success 'pushing valid refs triggers post-receive and post-update hooks' '
-	mk_test_with_hooks testrepo heads/master heads/next &&
-	orgmaster=$(cd testrepo && git show-ref -s --verify refs/heads/master) &&
-	newmaster=$(git show-ref -s --verify refs/heads/master) &&
+	mk_test_with_hooks testrepo heads/main heads/next &&
+	orgmain=$(cd testrepo && git show-ref -s --verify refs/heads/main) &&
+	newmain=$(git show-ref -s --verify refs/heads/main) &&
 	orgnext=$(cd testrepo && git show-ref -s --verify refs/heads/next) &&
 	newnext=$ZERO_OID &&
-	git push testrepo refs/heads/master:refs/heads/master :refs/heads/next &&
+	git push testrepo refs/heads/main:refs/heads/main :refs/heads/next &&
 	(
 		cd testrepo/.git &&
 		cat >pre-receive.expect <<-EOF &&
-		$orgmaster $newmaster refs/heads/master
+		$orgmain $newmain refs/heads/main
 		$orgnext $newnext refs/heads/next
 		EOF
 
 		cat >update.expect <<-EOF &&
-		refs/heads/master $orgmaster $newmaster
+		refs/heads/main $orgmain $newmain
 		refs/heads/next $orgnext $newnext
 		EOF
 
 		cat >post-receive.expect <<-EOF &&
-		$orgmaster $newmaster refs/heads/master
+		$orgmain $newmain refs/heads/main
 		$orgnext $newnext refs/heads/next
 		EOF
 
 		cat >post-update.expect <<-EOF &&
-		refs/heads/master
+		refs/heads/main
 		refs/heads/next
 		EOF
 
@@ -666,25 +756,26 @@ test_expect_success 'pushing valid refs triggers post-receive and post-update ho
 '
 
 test_expect_success 'deleting dangling ref triggers hooks with correct args' '
-	mk_test_with_hooks testrepo heads/master &&
+	mk_test_with_hooks testrepo heads/branch &&
+	orig=$(git -C testrepo rev-parse refs/heads/branch) &&
 	rm -f testrepo/.git/objects/??/* &&
-	git push testrepo :refs/heads/master &&
+	git push testrepo :refs/heads/branch &&
 	(
 		cd testrepo/.git &&
 		cat >pre-receive.expect <<-EOF &&
-		$ZERO_OID $ZERO_OID refs/heads/master
+		$orig $ZERO_OID refs/heads/branch
 		EOF
 
 		cat >update.expect <<-EOF &&
-		refs/heads/master $ZERO_OID $ZERO_OID
+		refs/heads/branch $orig $ZERO_OID
 		EOF
 
 		cat >post-receive.expect <<-EOF &&
-		$ZERO_OID $ZERO_OID refs/heads/master
+		$orig $ZERO_OID refs/heads/branch
 		EOF
 
 		cat >post-update.expect <<-EOF &&
-		refs/heads/master
+		refs/heads/branch
 		EOF
 
 		test_cmp pre-receive.expect pre-receive.actual &&
@@ -695,28 +786,28 @@ test_expect_success 'deleting dangling ref triggers hooks with correct args' '
 '
 
 test_expect_success 'deletion of a non-existent ref is not fed to post-receive and post-update hooks' '
-	mk_test_with_hooks testrepo heads/master &&
-	orgmaster=$(cd testrepo && git show-ref -s --verify refs/heads/master) &&
-	newmaster=$(git show-ref -s --verify refs/heads/master) &&
-	git push testrepo master :refs/heads/nonexistent &&
+	mk_test_with_hooks testrepo heads/main &&
+	orgmain=$(cd testrepo && git show-ref -s --verify refs/heads/main) &&
+	newmain=$(git show-ref -s --verify refs/heads/main) &&
+	git push testrepo main :refs/heads/nonexistent &&
 	(
 		cd testrepo/.git &&
 		cat >pre-receive.expect <<-EOF &&
-		$orgmaster $newmaster refs/heads/master
+		$orgmain $newmain refs/heads/main
 		$ZERO_OID $ZERO_OID refs/heads/nonexistent
 		EOF
 
 		cat >update.expect <<-EOF &&
-		refs/heads/master $orgmaster $newmaster
+		refs/heads/main $orgmain $newmain
 		refs/heads/nonexistent $ZERO_OID $ZERO_OID
 		EOF
 
 		cat >post-receive.expect <<-EOF &&
-		$orgmaster $newmaster refs/heads/master
+		$orgmain $newmain refs/heads/main
 		EOF
 
 		cat >post-update.expect <<-EOF &&
-		refs/heads/master
+		refs/heads/main
 		EOF
 
 		test_cmp pre-receive.expect pre-receive.actual &&
@@ -727,7 +818,7 @@ test_expect_success 'deletion of a non-existent ref is not fed to post-receive a
 '
 
 test_expect_success 'deletion of a non-existent ref alone does trigger post-receive and post-update hooks' '
-	mk_test_with_hooks testrepo heads/master &&
+	mk_test_with_hooks testrepo heads/main &&
 	git push testrepo :refs/heads/nonexistent &&
 	(
 		cd testrepo/.git &&
@@ -747,40 +838,40 @@ test_expect_success 'deletion of a non-existent ref alone does trigger post-rece
 '
 
 test_expect_success 'mixed ref updates, deletes, invalid deletes trigger hooks with correct input' '
-	mk_test_with_hooks testrepo heads/master heads/next heads/seen &&
-	orgmaster=$(cd testrepo && git show-ref -s --verify refs/heads/master) &&
-	newmaster=$(git show-ref -s --verify refs/heads/master) &&
+	mk_test_with_hooks testrepo heads/main heads/next heads/seen &&
+	orgmain=$(cd testrepo && git show-ref -s --verify refs/heads/main) &&
+	newmain=$(git show-ref -s --verify refs/heads/main) &&
 	orgnext=$(cd testrepo && git show-ref -s --verify refs/heads/next) &&
 	newnext=$ZERO_OID &&
 	orgseen=$(cd testrepo && git show-ref -s --verify refs/heads/seen) &&
-	newseen=$(git show-ref -s --verify refs/heads/master) &&
-	git push testrepo refs/heads/master:refs/heads/master \
-	    refs/heads/master:refs/heads/seen :refs/heads/next \
+	newseen=$(git show-ref -s --verify refs/heads/main) &&
+	git push testrepo refs/heads/main:refs/heads/main \
+	    refs/heads/main:refs/heads/seen :refs/heads/next \
 	    :refs/heads/nonexistent &&
 	(
 		cd testrepo/.git &&
 		cat >pre-receive.expect <<-EOF &&
-		$orgmaster $newmaster refs/heads/master
+		$orgmain $newmain refs/heads/main
 		$orgnext $newnext refs/heads/next
 		$orgseen $newseen refs/heads/seen
 		$ZERO_OID $ZERO_OID refs/heads/nonexistent
 		EOF
 
 		cat >update.expect <<-EOF &&
-		refs/heads/master $orgmaster $newmaster
+		refs/heads/main $orgmain $newmain
 		refs/heads/next $orgnext $newnext
 		refs/heads/seen $orgseen $newseen
 		refs/heads/nonexistent $ZERO_OID $ZERO_OID
 		EOF
 
 		cat >post-receive.expect <<-EOF &&
-		$orgmaster $newmaster refs/heads/master
+		$orgmain $newmain refs/heads/main
 		$orgnext $newnext refs/heads/next
 		$orgseen $newseen refs/heads/seen
 		EOF
 
 		cat >post-update.expect <<-EOF &&
-		refs/heads/master
+		refs/heads/main
 		refs/heads/next
 		refs/heads/seen
 		EOF
@@ -793,15 +884,15 @@ test_expect_success 'mixed ref updates, deletes, invalid deletes trigger hooks w
 '
 
 test_expect_success 'allow deleting a ref using --delete' '
-	mk_test testrepo heads/master &&
+	mk_test testrepo heads/main &&
 	(cd testrepo && git config receive.denyDeleteCurrent warn) &&
-	git push testrepo --delete master &&
-	(cd testrepo && test_must_fail git rev-parse --verify refs/heads/master)
+	git push testrepo --delete main &&
+	(cd testrepo && test_must_fail git rev-parse --verify refs/heads/main)
 '
 
 test_expect_success 'allow deleting a tag using --delete' '
-	mk_test testrepo heads/master &&
-	git tag -a -m dummy_message deltag heads/master &&
+	mk_test testrepo heads/main &&
+	git tag -a -m dummy_message deltag heads/main &&
 	git push testrepo --tags &&
 	(cd testrepo && git rev-parse --verify -q refs/tags/deltag) &&
 	git push testrepo --delete tag deltag &&
@@ -809,56 +900,68 @@ test_expect_success 'allow deleting a tag using --delete' '
 '
 
 test_expect_success 'push --delete without args aborts' '
-	mk_test testrepo heads/master &&
+	mk_test testrepo heads/main &&
 	test_must_fail git push testrepo --delete
 '
 
 test_expect_success 'push --delete refuses src:dest refspecs' '
+	mk_test testrepo heads/main &&
+	test_must_fail git push testrepo --delete main:foo
+'
+
+test_expect_success 'push --delete refuses empty string' '
 	mk_test testrepo heads/master &&
-	test_must_fail git push testrepo --delete master:foo
+	test_must_fail git push testrepo --delete ""
+'
+
+test_expect_success 'push --delete onelevel refspecs' '
+	mk_test testrepo heads/main &&
+	git -C testrepo update-ref refs/onelevel refs/heads/main &&
+	git push testrepo --delete refs/onelevel &&
+	test_must_fail git -C testrepo rev-parse --verify refs/onelevel
 '
 
 test_expect_success 'warn on push to HEAD of non-bare repository' '
-	mk_test testrepo heads/master &&
+	mk_test testrepo heads/main &&
 	(
 		cd testrepo &&
-		git checkout master &&
+		git checkout main &&
 		git config receive.denyCurrentBranch warn
 	) &&
-	git push testrepo master 2>stderr &&
+	git push testrepo main 2>stderr &&
 	grep "warning: updating the current branch" stderr
 '
 
 test_expect_success 'deny push to HEAD of non-bare repository' '
-	mk_test testrepo heads/master &&
+	mk_test testrepo heads/main &&
 	(
 		cd testrepo &&
-		git checkout master &&
+		git checkout main &&
 		git config receive.denyCurrentBranch true
 	) &&
-	test_must_fail git push testrepo master
+	test_must_fail git push testrepo main
 '
 
 test_expect_success 'allow push to HEAD of bare repository (bare)' '
-	mk_test testrepo heads/master &&
+	mk_test testrepo heads/main &&
 	(
 		cd testrepo &&
-		git checkout master &&
+		git checkout main &&
 		git config receive.denyCurrentBranch true &&
 		git config core.bare true
 	) &&
-	git push testrepo master 2>stderr &&
+	git push testrepo main 2>stderr &&
 	! grep "warning: updating the current branch" stderr
 '
 
 test_expect_success 'allow push to HEAD of non-bare repository (config)' '
-	mk_test testrepo heads/master &&
+	mk_test testrepo heads/main &&
 	(
 		cd testrepo &&
-		git checkout master &&
+		git checkout main &&
 		git config receive.denyCurrentBranch false
 	) &&
-	git push testrepo master 2>stderr &&
+	git push testrepo main 2>stderr &&
 	! grep "warning: updating the current branch" stderr
 '
 
@@ -866,6 +969,7 @@ test_expect_success 'fetch with branches' '
 	mk_empty testrepo &&
 	git branch second $the_first_commit &&
 	git checkout second &&
+	mkdir testrepo/.git/branches &&
 	echo ".." > testrepo/.git/branches/branch1 &&
 	(
 		cd testrepo &&
@@ -874,11 +978,12 @@ test_expect_success 'fetch with branches' '
 		git for-each-ref refs/heads >actual &&
 		test_cmp expect actual
 	) &&
-	git checkout master
+	git checkout main
 '
 
 test_expect_success 'fetch with branches containing #' '
 	mk_empty testrepo &&
+	mkdir testrepo/.git/branches &&
 	echo "..#second" > testrepo/.git/branches/branch2 &&
 	(
 		cd testrepo &&
@@ -887,17 +992,21 @@ test_expect_success 'fetch with branches containing #' '
 		git for-each-ref refs/heads >actual &&
 		test_cmp expect actual
 	) &&
-	git checkout master
+	git checkout main
 '
 
 test_expect_success 'push with branches' '
 	mk_empty testrepo &&
 	git checkout second &&
+
+	test_when_finished "rm -rf .git/branches" &&
+	mkdir .git/branches &&
 	echo "testrepo" > .git/branches/branch1 &&
+
 	git push branch1 &&
 	(
 		cd testrepo &&
-		echo "$the_first_commit commit	refs/heads/master" >expect &&
+		echo "$the_first_commit commit	refs/heads/main" >expect &&
 		git for-each-ref refs/heads >actual &&
 		test_cmp expect actual
 	)
@@ -905,7 +1014,11 @@ test_expect_success 'push with branches' '
 
 test_expect_success 'push with branches containing #' '
 	mk_empty testrepo &&
+
+	test_when_finished "rm -rf .git/branches" &&
+	mkdir .git/branches &&
 	echo "testrepo#branch3" > .git/branches/branch2 &&
+
 	git push branch2 &&
 	(
 		cd testrepo &&
@@ -913,11 +1026,11 @@ test_expect_success 'push with branches containing #' '
 		git for-each-ref refs/heads >actual &&
 		test_cmp expect actual
 	) &&
-	git checkout master
+	git checkout main
 '
 
 test_expect_success 'push into aliased refs (consistent)' '
-	mk_test testrepo heads/master &&
+	mk_test testrepo heads/main &&
 	mk_child testrepo child1 &&
 	mk_child testrepo child2 &&
 	(
@@ -939,7 +1052,7 @@ test_expect_success 'push into aliased refs (consistent)' '
 '
 
 test_expect_success 'push into aliased refs (inconsistent)' '
-	mk_test testrepo heads/master &&
+	mk_test testrepo heads/main &&
 	mk_child testrepo child1 &&
 	mk_child testrepo child2 &&
 	(
@@ -970,7 +1083,7 @@ test_force_push_tag () {
 	tag_args=$2
 
 	test_expect_success "force pushing required to update $tag_type_description" "
-		mk_test testrepo heads/master &&
+		mk_test testrepo heads/main &&
 		mk_child testrepo child1 &&
 		mk_child testrepo child2 &&
 		(
@@ -1016,7 +1129,7 @@ test_force_fetch_tag () {
 	tag_args=$2
 
 	test_expect_success "fetch will not clobber an existing $tag_type_description without --force" "
-		mk_test testrepo heads/master &&
+		mk_test testrepo heads/main &&
 		mk_child testrepo child1 &&
 		mk_child testrepo child2 &&
 		(
@@ -1039,12 +1152,12 @@ test_force_fetch_tag "annotated tag" "-f -a -m'tag message'"
 test_expect_success 'push --porcelain' '
 	mk_empty testrepo &&
 	echo >.git/foo  "To testrepo" &&
-	echo >>.git/foo "*	refs/heads/master:refs/remotes/origin/master	[new branch]"  &&
+	echo >>.git/foo "*	refs/heads/main:refs/remotes/origin/main	[new reference]"  &&
 	echo >>.git/foo "Done" &&
-	git push >.git/bar --porcelain  testrepo refs/heads/master:refs/remotes/origin/master &&
+	git push >.git/bar --porcelain  testrepo refs/heads/main:refs/remotes/origin/main &&
 	(
 		cd testrepo &&
-		echo "$the_commit commit	refs/remotes/origin/master" >expect &&
+		echo "$the_commit commit	refs/remotes/origin/main" >expect &&
 		git for-each-ref refs/remotes/origin >actual &&
 		test_cmp expect actual
 	) &&
@@ -1053,52 +1166,52 @@ test_expect_success 'push --porcelain' '
 
 test_expect_success 'push --porcelain bad url' '
 	mk_empty testrepo &&
-	test_must_fail git push >.git/bar --porcelain asdfasdfasd refs/heads/master:refs/remotes/origin/master &&
+	test_must_fail git push >.git/bar --porcelain asdfasdfasd refs/heads/main:refs/remotes/origin/main &&
 	! grep -q Done .git/bar
 '
 
 test_expect_success 'push --porcelain rejected' '
 	mk_empty testrepo &&
-	git push testrepo refs/heads/master:refs/remotes/origin/master &&
+	git push testrepo refs/heads/main:refs/remotes/origin/main &&
 	(cd testrepo &&
-		git reset --hard origin/master^ &&
+		git reset --hard origin/main^ &&
 		git config receive.denyCurrentBranch true) &&
 
 	echo >.git/foo  "To testrepo"  &&
-	echo >>.git/foo "!	refs/heads/master:refs/heads/master	[remote rejected] (branch is currently checked out)" &&
+	echo >>.git/foo "!	refs/heads/main:refs/heads/main	[remote rejected] (branch is currently checked out)" &&
 	echo >>.git/foo "Done" &&
 
-	test_must_fail git push >.git/bar --porcelain  testrepo refs/heads/master:refs/heads/master &&
+	test_must_fail git push >.git/bar --porcelain  testrepo refs/heads/main:refs/heads/main &&
 	test_cmp .git/foo .git/bar
 '
 
 test_expect_success 'push --porcelain --dry-run rejected' '
 	mk_empty testrepo &&
-	git push testrepo refs/heads/master:refs/remotes/origin/master &&
+	git push testrepo refs/heads/main:refs/remotes/origin/main &&
 	(cd testrepo &&
-		git reset --hard origin/master &&
+		git reset --hard origin/main &&
 		git config receive.denyCurrentBranch true) &&
 
 	echo >.git/foo  "To testrepo"  &&
-	echo >>.git/foo "!	refs/heads/master^:refs/heads/master	[rejected] (non-fast-forward)" &&
+	echo >>.git/foo "!	refs/heads/main^:refs/heads/main	[rejected] (non-fast-forward)" &&
 	echo >>.git/foo "Done" &&
 
-	test_must_fail git push >.git/bar --porcelain  --dry-run testrepo refs/heads/master^:refs/heads/master &&
+	test_must_fail git push >.git/bar --porcelain  --dry-run testrepo refs/heads/main^:refs/heads/main &&
 	test_cmp .git/foo .git/bar
 '
 
 test_expect_success 'push --prune' '
-	mk_test testrepo heads/master heads/second heads/foo heads/bar &&
+	mk_test testrepo heads/main heads/second heads/foo heads/bar &&
 	git push --prune testrepo : &&
-	check_push_result testrepo $the_commit heads/master &&
+	check_push_result testrepo $the_commit heads/main &&
 	check_push_result testrepo $the_first_commit heads/second &&
 	! check_push_result testrepo $the_first_commit heads/foo heads/bar
 '
 
 test_expect_success 'push --prune refspec' '
-	mk_test testrepo tmp/master tmp/second tmp/foo tmp/bar &&
+	mk_test testrepo tmp/main tmp/second tmp/foo tmp/bar &&
 	git push --prune testrepo "refs/heads/*:refs/tmp/*" &&
-	check_push_result testrepo $the_commit tmp/master &&
+	check_push_result testrepo $the_commit tmp/main &&
 	check_push_result testrepo $the_first_commit tmp/second &&
 	! check_push_result testrepo $the_first_commit tmp/foo tmp/bar
 '
@@ -1106,18 +1219,18 @@ test_expect_success 'push --prune refspec' '
 for configsection in transfer receive
 do
 	test_expect_success "push to update a ref hidden by $configsection.hiderefs" '
-		mk_test testrepo heads/master hidden/one hidden/two hidden/three &&
+		mk_test testrepo heads/main hidden/one hidden/two hidden/three &&
 		(
 			cd testrepo &&
 			git config $configsection.hiderefs refs/hidden
 		) &&
 
 		# push to unhidden ref succeeds normally
-		git push testrepo master:refs/heads/master &&
-		check_push_result testrepo $the_commit heads/master &&
+		git push testrepo main:refs/heads/main &&
+		check_push_result testrepo $the_commit heads/main &&
 
 		# push to update a hidden ref should fail
-		test_must_fail git push testrepo master:refs/hidden/one &&
+		test_must_fail git push testrepo main:refs/hidden/one &&
 		check_push_result testrepo $the_first_commit hidden/one &&
 
 		# push to delete a hidden ref should fail
@@ -1131,8 +1244,8 @@ do
 done
 
 test_expect_success 'fetch exact SHA1' '
-	mk_test testrepo heads/master hidden/one &&
-	git push testrepo master:refs/hidden/one &&
+	mk_test testrepo heads/main hidden/one &&
+	git push testrepo main:refs/hidden/one &&
 	(
 		cd testrepo &&
 		git config transfer.hiderefs refs/hidden
@@ -1154,7 +1267,7 @@ test_expect_success 'fetch exact SHA1' '
 		# fetching the hidden object should fail by default
 		test_must_fail env GIT_TEST_PROTOCOL_VERSION=0 \
 			git fetch -v ../testrepo $the_commit:refs/heads/copy 2>err &&
-		test_i18ngrep "Server does not allow request for unadvertised object" err &&
+		test_grep "Server does not allow request for unadvertised object" err &&
 		test_must_fail git rev-parse --verify refs/heads/copy &&
 
 		# the server side can allow it to succeed
@@ -1163,7 +1276,7 @@ test_expect_success 'fetch exact SHA1' '
 			git config uploadpack.allowtipsha1inwant true
 		) &&
 
-		git fetch -v ../testrepo $the_commit:refs/heads/copy master:refs/heads/extra &&
+		git fetch -v ../testrepo $the_commit:refs/heads/copy main:refs/heads/extra &&
 		cat >expect <<-EOF &&
 		$the_commit
 		$the_first_commit
@@ -1177,8 +1290,8 @@ test_expect_success 'fetch exact SHA1' '
 '
 
 test_expect_success 'fetch exact SHA1 in protocol v2' '
-	mk_test testrepo heads/master hidden/one &&
-	git push testrepo master:refs/hidden/one &&
+	mk_test testrepo heads/main hidden/one &&
+	git push testrepo main:refs/hidden/one &&
 	git -C testrepo config transfer.hiderefs refs/hidden &&
 	check_push_result testrepo $the_commit hidden/one &&
 
@@ -1254,32 +1367,32 @@ do
 			git cat-file commit $SHA1_2 &&
 			test_must_fail env GIT_TEST_PROTOCOL_VERSION=0 \
 				git fetch ../testrepo/.git $SHA1_3 2>err &&
-			test_i18ngrep "remote error:.*not our ref.*$SHA1_3\$" err
+			# ideally we would insist this be on a "remote error:"
+			# line, but it is racy; see the commit message
+			test_grep "not our ref.*$SHA1_3\$" err
 		)
 	'
 done
 
 test_expect_success 'fetch follows tags by default' '
-	mk_test testrepo heads/master &&
-	rm -fr src dst &&
+	mk_test testrepo heads/main &&
+	test_when_finished "rm -rf src" &&
 	git init src &&
 	(
 		cd src &&
-		git pull ../testrepo master &&
+		git pull ../testrepo main &&
 		git tag -m "annotated" tag &&
 		git for-each-ref >tmp1 &&
-		(
-			cat tmp1
-			sed -n "s|refs/heads/master$|refs/remotes/origin/master|p" tmp1
-		) |
+		sed -n "p; s|refs/heads/main$|refs/remotes/origin/main|p" tmp1 |
 		sort -k 3 >../expect
 	) &&
+	test_when_finished "rm -rf dst" &&
 	git init dst &&
 	(
 		cd dst &&
 		git remote add origin ../src &&
-		git config branch.master.remote origin &&
-		git config branch.master.merge refs/heads/master &&
+		git config branch.main.remote origin &&
+		git config branch.main.merge refs/heads/main &&
 		git pull &&
 		git for-each-ref >../actual
 	) &&
@@ -1294,78 +1407,81 @@ test_expect_success 'peeled advertisements are not considered ref tips' '
 	oid=$(git -C testrepo rev-parse mytag^{commit}) &&
 	test_must_fail env GIT_TEST_PROTOCOL_VERSION=0 \
 		git fetch testrepo $oid 2>err &&
-	test_i18ngrep "Server does not allow request for unadvertised object" err
+	test_grep "Server does not allow request for unadvertised object" err
 '
 
 test_expect_success 'pushing a specific ref applies remote.$name.push as refmap' '
-	mk_test testrepo heads/master &&
-	rm -fr src dst &&
+	mk_test testrepo heads/main &&
+	test_when_finished "rm -rf src" &&
 	git init src &&
+	test_when_finished "rm -rf dst" &&
 	git init --bare dst &&
 	(
 		cd src &&
-		git pull ../testrepo master &&
+		git pull ../testrepo main &&
 		git branch next &&
 		git config remote.dst.url ../dst &&
 		git config remote.dst.push "+refs/heads/*:refs/remotes/src/*" &&
-		git push dst master &&
-		git show-ref refs/heads/master |
+		git push dst main &&
+		git show-ref refs/heads/main |
 		sed -e "s|refs/heads/|refs/remotes/src/|" >../dst/expect
 	) &&
 	(
 		cd dst &&
 		test_must_fail git show-ref refs/heads/next &&
-		test_must_fail git show-ref refs/heads/master &&
-		git show-ref refs/remotes/src/master >actual
+		test_must_fail git show-ref refs/heads/main &&
+		git show-ref refs/remotes/src/main >actual
 	) &&
 	test_cmp dst/expect dst/actual
 '
 
 test_expect_success 'with no remote.$name.push, it is not used as refmap' '
-	mk_test testrepo heads/master &&
-	rm -fr src dst &&
+	mk_test testrepo heads/main &&
+	test_when_finished "rm -rf src" &&
 	git init src &&
+	test_when_finished "rm -rf dst" &&
 	git init --bare dst &&
 	(
 		cd src &&
-		git pull ../testrepo master &&
+		git pull ../testrepo main &&
 		git branch next &&
 		git config remote.dst.url ../dst &&
 		git config push.default matching &&
-		git push dst master &&
-		git show-ref refs/heads/master >../dst/expect
+		git push dst main &&
+		git show-ref refs/heads/main >../dst/expect
 	) &&
 	(
 		cd dst &&
 		test_must_fail git show-ref refs/heads/next &&
-		git show-ref refs/heads/master >actual
+		git show-ref refs/heads/main >actual
 	) &&
 	test_cmp dst/expect dst/actual
 '
 
 test_expect_success 'with no remote.$name.push, upstream mapping is used' '
-	mk_test testrepo heads/master &&
-	rm -fr src dst &&
+	mk_test testrepo heads/main &&
+	test_when_finished "rm -rf src" &&
 	git init src &&
+	test_when_finished "rm -rf dst" &&
 	git init --bare dst &&
 	(
 		cd src &&
-		git pull ../testrepo master &&
+		git pull ../testrepo main &&
 		git branch next &&
 		git config remote.dst.url ../dst &&
 		git config remote.dst.fetch "+refs/heads/*:refs/remotes/dst/*" &&
 		git config push.default upstream &&
 
-		git config branch.master.merge refs/heads/trunk &&
-		git config branch.master.remote dst &&
+		git config branch.main.merge refs/heads/trunk &&
+		git config branch.main.remote dst &&
 
-		git push dst master &&
-		git show-ref refs/heads/master |
-		sed -e "s|refs/heads/master|refs/heads/trunk|" >../dst/expect
+		git push dst main &&
+		git show-ref refs/heads/main |
+		sed -e "s|refs/heads/main|refs/heads/trunk|" >../dst/expect
 	) &&
 	(
 		cd dst &&
-		test_must_fail git show-ref refs/heads/master &&
+		test_must_fail git show-ref refs/heads/main &&
 		test_must_fail git show-ref refs/heads/next &&
 		git show-ref refs/heads/trunk >actual
 	) &&
@@ -1373,20 +1489,21 @@ test_expect_success 'with no remote.$name.push, upstream mapping is used' '
 '
 
 test_expect_success 'push does not follow tags by default' '
-	mk_test testrepo heads/master &&
-	rm -fr src dst &&
+	mk_test testrepo heads/main &&
+	test_when_finished "rm -rf src" &&
 	git init src &&
+	test_when_finished "rm -rf dst" &&
 	git init --bare dst &&
 	(
 		cd src &&
-		git pull ../testrepo master &&
+		git pull ../testrepo main &&
 		git tag -m "annotated" tag &&
 		git checkout -b another &&
 		git commit --allow-empty -m "future commit" &&
 		git tag -m "future" future &&
-		git checkout master &&
-		git for-each-ref refs/heads/master >../expect &&
-		git push ../dst master
+		git checkout main &&
+		git for-each-ref refs/heads/main >../expect &&
+		git push ../dst main
 	) &&
 	(
 		cd dst &&
@@ -1396,20 +1513,21 @@ test_expect_success 'push does not follow tags by default' '
 '
 
 test_expect_success 'push --follow-tags only pushes relevant tags' '
-	mk_test testrepo heads/master &&
-	rm -fr src dst &&
+	mk_test testrepo heads/main &&
+	test_when_finished "rm -rf src" &&
 	git init src &&
+	test_when_finished "rm -rf dst" &&
 	git init --bare dst &&
 	(
 		cd src &&
-		git pull ../testrepo master &&
+		git pull ../testrepo main &&
 		git tag -m "annotated" tag &&
 		git checkout -b another &&
 		git commit --allow-empty -m "future commit" &&
 		git tag -m "future" future &&
-		git checkout master &&
-		git for-each-ref refs/heads/master refs/tags/tag >../expect &&
-		git push --follow-tags ../dst master
+		git checkout main &&
+		git for-each-ref refs/heads/main refs/tags/tag >../expect &&
+		git push --follow-tags ../dst main
 	) &&
 	(
 		cd dst &&
@@ -1427,18 +1545,18 @@ EOF
 	git commit -am initial &&
 	git init no-thin &&
 	git --git-dir=no-thin/.git config receive.unpacklimit 0 &&
-	git push no-thin/.git refs/heads/master:refs/heads/foo &&
+	git push no-thin/.git refs/heads/main:refs/heads/foo &&
 	echo modified >> path1 &&
 	git commit -am modified &&
 	git repack -adf &&
 	rcvpck="git receive-pack --reject-thin-pack-for-testing" &&
-	git push --no-thin --receive-pack="$rcvpck" no-thin/.git refs/heads/master:refs/heads/foo
+	git push --no-thin --receive-pack="$rcvpck" no-thin/.git refs/heads/main:refs/heads/foo
 '
 
 test_expect_success 'pushing a tag pushes the tagged object' '
-	rm -rf dst.git &&
 	blob=$(echo unreferenced | git hash-object -w --stdin) &&
 	git tag -m foo tag-of-blob $blob &&
+	test_when_finished "rm -rf dst.git" &&
 	git init --bare dst.git &&
 	git push dst.git tag-of-blob &&
 	# the receiving index-pack should have noticed
@@ -1449,25 +1567,25 @@ test_expect_success 'pushing a tag pushes the tagged object' '
 '
 
 test_expect_success 'push into bare respects core.logallrefupdates' '
-	rm -rf dst.git &&
+	test_when_finished "rm -rf dst.git" &&
 	git init --bare dst.git &&
 	git -C dst.git config core.logallrefupdates true &&
 
 	# double push to test both with and without
 	# the actual pack transfer
-	git push dst.git master:one &&
+	git push dst.git main:one &&
 	echo "one@{0} push" >expect &&
 	git -C dst.git log -g --format="%gd %gs" one >actual &&
 	test_cmp expect actual &&
 
-	git push dst.git master:two &&
+	git push dst.git main:two &&
 	echo "two@{0} push" >expect &&
 	git -C dst.git log -g --format="%gd %gs" two >actual &&
 	test_cmp expect actual
 '
 
 test_expect_success 'fetch into bare respects core.logallrefupdates' '
-	rm -rf dst.git &&
+	test_when_finished "rm -rf dst.git" &&
 	git init --bare dst.git &&
 	(
 		cd dst.git &&
@@ -1475,20 +1593,21 @@ test_expect_success 'fetch into bare respects core.logallrefupdates' '
 
 		# as above, we double-fetch to test both
 		# with and without pack transfer
-		git fetch .. master:one &&
-		echo "one@{0} fetch .. master:one: storing head" >expect &&
+		git fetch .. main:one &&
+		echo "one@{0} fetch .. main:one: storing head" >expect &&
 		git log -g --format="%gd %gs" one >actual &&
 		test_cmp expect actual &&
 
-		git fetch .. master:two &&
-		echo "two@{0} fetch .. master:two: storing head" >expect &&
+		git fetch .. main:two &&
+		echo "two@{0} fetch .. main:two: storing head" >expect &&
 		git log -g --format="%gd %gs" two >actual &&
 		test_cmp expect actual
 	)
 '
 
 test_expect_success 'receive.denyCurrentBranch = updateInstead' '
-	git push testrepo master &&
+	mk_empty testrepo &&
+	git push testrepo main &&
 	(
 		cd testrepo &&
 		git reset --hard &&
@@ -1497,7 +1616,7 @@ test_expect_success 'receive.denyCurrentBranch = updateInstead' '
 	test_commit third path2 &&
 
 	# Try pushing into a repository with pristine working tree
-	git push testrepo master &&
+	git push testrepo main &&
 	(
 		cd testrepo &&
 		git update-index -q --refresh &&
@@ -1514,7 +1633,7 @@ test_expect_success 'receive.denyCurrentBranch = updateInstead' '
 		test $(git -C .. rev-parse HEAD^) = $(git rev-parse HEAD) &&
 		test-tool chmtime +100 path1
 	) &&
-	git push testrepo master &&
+	git push testrepo main &&
 	(
 		cd testrepo &&
 		git update-index -q --refresh &&
@@ -1534,7 +1653,7 @@ test_expect_success 'receive.denyCurrentBranch = updateInstead' '
 		cd testrepo &&
 		echo changed >path1
 	) &&
-	test_must_fail git push testrepo master &&
+	test_must_fail git push testrepo main &&
 	(
 		cd testrepo &&
 		test $(git -C .. rev-parse HEAD^) = $(git rev-parse HEAD) &&
@@ -1548,7 +1667,7 @@ test_expect_success 'receive.denyCurrentBranch = updateInstead' '
 		echo changed >path1 &&
 		git add path1
 	) &&
-	test_must_fail git push testrepo master &&
+	test_must_fail git push testrepo main &&
 	(
 		cd testrepo &&
 		test $(git -C .. rev-parse HEAD^) = $(git rev-parse HEAD) &&
@@ -1565,7 +1684,7 @@ test_expect_success 'receive.denyCurrentBranch = updateInstead' '
 		git reset --hard &&
 		echo changed >path3
 	) &&
-	test_must_fail git push testrepo master &&
+	test_must_fail git push testrepo main &&
 	(
 		cd testrepo &&
 		test $(git -C .. rev-parse HEAD^^) = $(git rev-parse HEAD) &&
@@ -1581,7 +1700,7 @@ test_expect_success 'receive.denyCurrentBranch = updateInstead' '
 		echo fifth >path3 &&
 		git add path3
 	) &&
-	test_must_fail git push testrepo master &&
+	test_must_fail git push testrepo main &&
 	(
 		cd testrepo &&
 		test $(git -C .. rev-parse HEAD^^) = $(git rev-parse HEAD) &&
@@ -1590,51 +1709,48 @@ test_expect_success 'receive.denyCurrentBranch = updateInstead' '
 	) &&
 
 	# (5) push into void
-	rm -fr void &&
+	test_when_finished "rm -rf void" &&
 	git init void &&
 	(
 		cd void &&
 		git config receive.denyCurrentBranch updateInstead
 	) &&
-	git push void master &&
+	git push void main &&
 	(
 		cd void &&
-		test $(git -C .. rev-parse master) = $(git rev-parse HEAD) &&
+		test $(git -C .. rev-parse main) = $(git rev-parse HEAD) &&
 		git diff --quiet &&
 		git diff --cached --quiet
 	) &&
 
 	# (6) updateInstead intervened by fast-forward check
-	test_must_fail git push void master^:master &&
-	test $(git -C void rev-parse HEAD) = $(git rev-parse master) &&
+	test_must_fail git push void main^:main &&
+	test $(git -C void rev-parse HEAD) = $(git rev-parse main) &&
 	git -C void diff --quiet &&
 	git -C void diff --cached --quiet
 '
 
 test_expect_success 'updateInstead with push-to-checkout hook' '
-	rm -fr testrepo &&
+	test_when_finished "rm -rf testrepo" &&
 	git init testrepo &&
-	(
-		cd testrepo &&
-		git pull .. master &&
-		git reset --hard HEAD^^ &&
-		git tag initial &&
-		git config receive.denyCurrentBranch updateInstead &&
-		write_script .git/hooks/push-to-checkout <<-\EOF
-		echo >&2 updating from $(git rev-parse HEAD)
-		echo >&2 updating to "$1"
-
-		git update-index -q --refresh &&
-		git read-tree -u -m HEAD "$1" || {
-			status=$?
-			echo >&2 read-tree failed
-			exit $status
-		}
-		EOF
-	) &&
+	git -C testrepo pull .. main &&
+	git -C testrepo reset --hard HEAD^^ &&
+	git -C testrepo tag initial &&
+	git -C testrepo config receive.denyCurrentBranch updateInstead &&
+	test_hook -C testrepo push-to-checkout <<-\EOF &&
+	echo >&2 updating from $(git rev-parse HEAD)
+	echo >&2 updating to "$1"
+
+	git update-index -q --refresh &&
+	git read-tree -u -m HEAD "$1" || {
+		status=$?
+		echo >&2 read-tree failed
+		exit $status
+	}
+	EOF
 
 	# Try pushing into a pristine
-	git push testrepo master &&
+	git push testrepo main &&
 	(
 		cd testrepo &&
 		git diff --quiet &&
@@ -1648,7 +1764,7 @@ test_expect_success 'updateInstead with push-to-checkout hook' '
 		git reset --hard initial &&
 		echo conflicting >path2
 	) &&
-	test_must_fail git push testrepo master &&
+	test_must_fail git push testrepo main &&
 	(
 		cd testrepo &&
 		test $(git rev-parse initial) = $(git rev-parse HEAD) &&
@@ -1664,7 +1780,7 @@ test_expect_success 'updateInstead with push-to-checkout hook' '
 		echo irrelevant >path5 &&
 		git add path5
 	) &&
-	git push testrepo master &&
+	git push testrepo main &&
 	(
 		cd testrepo &&
 		test "$(cat path1)" = unrelated &&
@@ -1674,37 +1790,34 @@ test_expect_success 'updateInstead with push-to-checkout hook' '
 	) &&
 
 	# push into void
-	rm -fr void &&
+	test_when_finished "rm -rf void" &&
 	git init void &&
-	(
-		cd void &&
-		git config receive.denyCurrentBranch updateInstead &&
-		write_script .git/hooks/push-to-checkout <<-\EOF
-		if git rev-parse --quiet --verify HEAD
-		then
-			has_head=yes
-			echo >&2 updating from $(git rev-parse HEAD)
-		else
-			has_head=no
-			echo >&2 pushing into void
-		fi
-		echo >&2 updating to "$1"
-
-		git update-index -q --refresh &&
-		case "$has_head" in
-		yes)
-			git read-tree -u -m HEAD "$1" ;;
-		no)
-			git read-tree -u -m "$1" ;;
-		esac || {
-			status=$?
-			echo >&2 read-tree failed
-			exit $status
-		}
-		EOF
-	) &&
-
-	git push void master &&
+	git -C void config receive.denyCurrentBranch updateInstead &&
+	test_hook -C void push-to-checkout <<-\EOF &&
+	if git rev-parse --quiet --verify HEAD
+	then
+		has_head=yes
+		echo >&2 updating from $(git rev-parse HEAD)
+	else
+		has_head=no
+		echo >&2 pushing into void
+	fi
+	echo >&2 updating to "$1"
+
+	git update-index -q --refresh &&
+	case "$has_head" in
+	yes)
+		git read-tree -u -m HEAD "$1" ;;
+	no)
+		git read-tree -u -m "$1" ;;
+	esac || {
+		status=$?
+		echo >&2 read-tree failed
+		exit $status
+	}
+	EOF
+
+	git push void main &&
 	(
 		cd void &&
 		git diff --quiet &&
@@ -1721,7 +1834,68 @@ test_expect_success 'denyCurrentBranch and worktrees' '
 	test_must_fail git -C cloned push origin HEAD:new-wt &&
 	test_config receive.denyCurrentBranch updateInstead &&
 	git -C cloned push origin HEAD:new-wt &&
+	test_path_exists new-wt/first.t &&
 	test_must_fail git -C cloned push --delete origin new-wt
 '
 
+test_expect_success 'denyCurrentBranch and bare repository worktrees' '
+	test_when_finished "rm -fr bare.git" &&
+	git clone --bare . bare.git &&
+	git -C bare.git worktree add wt &&
+	test_commit grape &&
+	git -C bare.git config receive.denyCurrentBranch refuse &&
+	test_must_fail git push bare.git HEAD:wt &&
+	git -C bare.git config receive.denyCurrentBranch updateInstead &&
+	git push bare.git HEAD:wt &&
+	test_path_exists bare.git/wt/grape.t &&
+	test_must_fail git push --delete bare.git wt
+'
+
+test_expect_success 'refuse fetch to current branch of worktree' '
+	test_when_finished "git worktree remove --force wt && git branch -D wt" &&
+	git worktree add wt &&
+	test_commit apple &&
+	test_must_fail git fetch . HEAD:wt &&
+	git fetch -u . HEAD:wt
+'
+
+test_expect_success 'refuse fetch to current branch of bare repository worktree' '
+	test_when_finished "rm -fr bare.git" &&
+	git clone --bare . bare.git &&
+	git -C bare.git worktree add wt &&
+	test_commit banana &&
+	test_must_fail git -C bare.git fetch .. HEAD:wt &&
+	git -C bare.git fetch -u .. HEAD:wt
+'
+
+test_expect_success 'refuse to push a hidden ref, and make sure do not pollute the repository' '
+	mk_empty testrepo &&
+	git -C testrepo config receive.hiderefs refs/hidden &&
+	git -C testrepo config receive.unpackLimit 1 &&
+	test_must_fail git push testrepo HEAD:refs/hidden/foo &&
+	test_dir_is_empty testrepo/.git/objects/pack
+'
+
+test_expect_success 'push with config push.useBitmaps' '
+	mk_test testrepo heads/main &&
+	git checkout main &&
+	test_unconfig push.useBitmaps &&
+	GIT_TRACE2_EVENT="$PWD/default" \
+	git push --quiet testrepo main:test &&
+	test_subcommand git pack-objects --all-progress-implied --revs --stdout \
+		--thin --delta-base-offset -q <default &&
+
+	test_config push.useBitmaps true &&
+	GIT_TRACE2_EVENT="$PWD/true" \
+	git push --quiet testrepo main:test2 &&
+	test_subcommand git pack-objects --all-progress-implied --revs --stdout \
+		--thin --delta-base-offset -q <true &&
+
+	test_config push.useBitmaps false &&
+	GIT_TRACE2_EVENT="$PWD/false" \
+	git push --quiet testrepo main:test3 &&
+	test_subcommand git pack-objects --all-progress-implied --revs --stdout \
+		--thin --delta-base-offset -q --no-use-bitmap-index <false
+'
+
 test_done
diff --git a/t/t5517-push-mirror.sh b/t/t5517-push-mirror.sh
index e4edd56..6d4944a 100755
--- a/t/t5517-push-mirror.sh
+++ b/t/t5517-push-mirror.sh
@@ -2,6 +2,10 @@
 
 test_description='pushing to a mirror repository'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 D=$(pwd)
@@ -15,16 +19,16 @@ invert () {
 }
 
 mk_repo_pair () {
-	rm -rf master mirror &&
+	rm -rf main mirror &&
 	mkdir mirror &&
 	(
 		cd mirror &&
 		git init &&
 		git config receive.denyCurrentBranch warn
 	) &&
-	mkdir master &&
+	mkdir main &&
 	(
-		cd master &&
+		cd main &&
 		git init &&
 		git remote add $1 up ../mirror
 	)
@@ -36,13 +40,13 @@ test_expect_success 'push mirror creates new branches' '
 
 	mk_repo_pair &&
 	(
-		cd master &&
+		cd main &&
 		echo one >foo && git add foo && git commit -m one &&
 		git push --mirror up
 	) &&
-	master_master=$(cd master && git show-ref -s --verify refs/heads/master) &&
-	mirror_master=$(cd mirror && git show-ref -s --verify refs/heads/master) &&
-	test "$master_master" = "$mirror_master"
+	main_main=$(cd main && git show-ref -s --verify refs/heads/main) &&
+	mirror_main=$(cd mirror && git show-ref -s --verify refs/heads/main) &&
+	test "$main_main" = "$mirror_main"
 
 '
 
@@ -50,15 +54,15 @@ test_expect_success 'push mirror updates existing branches' '
 
 	mk_repo_pair &&
 	(
-		cd master &&
+		cd main &&
 		echo one >foo && git add foo && git commit -m one &&
 		git push --mirror up &&
 		echo two >foo && git add foo && git commit -m two &&
 		git push --mirror up
 	) &&
-	master_master=$(cd master && git show-ref -s --verify refs/heads/master) &&
-	mirror_master=$(cd mirror && git show-ref -s --verify refs/heads/master) &&
-	test "$master_master" = "$mirror_master"
+	main_main=$(cd main && git show-ref -s --verify refs/heads/main) &&
+	mirror_main=$(cd mirror && git show-ref -s --verify refs/heads/main) &&
+	test "$main_main" = "$mirror_main"
 
 '
 
@@ -66,7 +70,7 @@ test_expect_success 'push mirror force updates existing branches' '
 
 	mk_repo_pair &&
 	(
-		cd master &&
+		cd main &&
 		echo one >foo && git add foo && git commit -m one &&
 		git push --mirror up &&
 		echo two >foo && git add foo && git commit -m two &&
@@ -74,9 +78,9 @@ test_expect_success 'push mirror force updates existing branches' '
 		git reset --hard HEAD^ &&
 		git push --mirror up
 	) &&
-	master_master=$(cd master && git show-ref -s --verify refs/heads/master) &&
-	mirror_master=$(cd mirror && git show-ref -s --verify refs/heads/master) &&
-	test "$master_master" = "$mirror_master"
+	main_main=$(cd main && git show-ref -s --verify refs/heads/main) &&
+	mirror_main=$(cd mirror && git show-ref -s --verify refs/heads/main) &&
+	test "$main_main" = "$mirror_main"
 
 '
 
@@ -84,9 +88,9 @@ test_expect_success 'push mirror removes branches' '
 
 	mk_repo_pair &&
 	(
-		cd master &&
+		cd main &&
 		echo one >foo && git add foo && git commit -m one &&
-		git branch remove master &&
+		git branch remove main &&
 		git push --mirror up &&
 		git branch -D remove &&
 		git push --mirror up
@@ -102,21 +106,21 @@ test_expect_success 'push mirror adds, updates and removes branches together' '
 
 	mk_repo_pair &&
 	(
-		cd master &&
+		cd main &&
 		echo one >foo && git add foo && git commit -m one &&
-		git branch remove master &&
+		git branch remove main &&
 		git push --mirror up &&
 		git branch -D remove &&
-		git branch add master &&
+		git branch add main &&
 		echo two >foo && git add foo && git commit -m two &&
 		git push --mirror up
 	) &&
-	master_master=$(cd master && git show-ref -s --verify refs/heads/master) &&
-	master_add=$(cd master && git show-ref -s --verify refs/heads/add) &&
-	mirror_master=$(cd mirror && git show-ref -s --verify refs/heads/master) &&
+	main_main=$(cd main && git show-ref -s --verify refs/heads/main) &&
+	main_add=$(cd main && git show-ref -s --verify refs/heads/add) &&
+	mirror_main=$(cd mirror && git show-ref -s --verify refs/heads/main) &&
 	mirror_add=$(cd mirror && git show-ref -s --verify refs/heads/add) &&
-	test "$master_master" = "$mirror_master" &&
-	test "$master_add" = "$mirror_add" &&
+	test "$main_main" = "$mirror_main" &&
+	test "$main_add" = "$mirror_add" &&
 	(
 		cd mirror &&
 		invert git show-ref -s --verify refs/heads/remove
@@ -130,14 +134,14 @@ test_expect_success 'push mirror creates new tags' '
 
 	mk_repo_pair &&
 	(
-		cd master &&
+		cd main &&
 		echo one >foo && git add foo && git commit -m one &&
-		git tag -f tmaster master &&
+		git tag -f tmain main &&
 		git push --mirror up
 	) &&
-	master_master=$(cd master && git show-ref -s --verify refs/tags/tmaster) &&
-	mirror_master=$(cd mirror && git show-ref -s --verify refs/tags/tmaster) &&
-	test "$master_master" = "$mirror_master"
+	main_main=$(cd main && git show-ref -s --verify refs/tags/tmain) &&
+	mirror_main=$(cd mirror && git show-ref -s --verify refs/tags/tmain) &&
+	test "$main_main" = "$mirror_main"
 
 '
 
@@ -145,17 +149,17 @@ test_expect_success 'push mirror updates existing tags' '
 
 	mk_repo_pair &&
 	(
-		cd master &&
+		cd main &&
 		echo one >foo && git add foo && git commit -m one &&
-		git tag -f tmaster master &&
+		git tag -f tmain main &&
 		git push --mirror up &&
 		echo two >foo && git add foo && git commit -m two &&
-		git tag -f tmaster master &&
+		git tag -f tmain main &&
 		git push --mirror up
 	) &&
-	master_master=$(cd master && git show-ref -s --verify refs/tags/tmaster) &&
-	mirror_master=$(cd mirror && git show-ref -s --verify refs/tags/tmaster) &&
-	test "$master_master" = "$mirror_master"
+	main_main=$(cd main && git show-ref -s --verify refs/tags/tmain) &&
+	mirror_main=$(cd mirror && git show-ref -s --verify refs/tags/tmain) &&
+	test "$main_main" = "$mirror_main"
 
 '
 
@@ -163,20 +167,20 @@ test_expect_success 'push mirror force updates existing tags' '
 
 	mk_repo_pair &&
 	(
-		cd master &&
+		cd main &&
 		echo one >foo && git add foo && git commit -m one &&
-		git tag -f tmaster master &&
+		git tag -f tmain main &&
 		git push --mirror up &&
 		echo two >foo && git add foo && git commit -m two &&
-		git tag -f tmaster master &&
+		git tag -f tmain main &&
 		git push --mirror up &&
 		git reset --hard HEAD^ &&
-		git tag -f tmaster master &&
+		git tag -f tmain main &&
 		git push --mirror up
 	) &&
-	master_master=$(cd master && git show-ref -s --verify refs/tags/tmaster) &&
-	mirror_master=$(cd mirror && git show-ref -s --verify refs/tags/tmaster) &&
-	test "$master_master" = "$mirror_master"
+	main_main=$(cd main && git show-ref -s --verify refs/tags/tmain) &&
+	mirror_main=$(cd mirror && git show-ref -s --verify refs/tags/tmain) &&
+	test "$main_main" = "$mirror_main"
 
 '
 
@@ -184,9 +188,9 @@ test_expect_success 'push mirror removes tags' '
 
 	mk_repo_pair &&
 	(
-		cd master &&
+		cd main &&
 		echo one >foo && git add foo && git commit -m one &&
-		git tag -f tremove master &&
+		git tag -f tremove main &&
 		git push --mirror up &&
 		git tag -d tremove &&
 		git push --mirror up
@@ -202,23 +206,23 @@ test_expect_success 'push mirror adds, updates and removes tags together' '
 
 	mk_repo_pair &&
 	(
-		cd master &&
+		cd main &&
 		echo one >foo && git add foo && git commit -m one &&
-		git tag -f tmaster master &&
-		git tag -f tremove master &&
+		git tag -f tmain main &&
+		git tag -f tremove main &&
 		git push --mirror up &&
 		git tag -d tremove &&
-		git tag tadd master &&
+		git tag tadd main &&
 		echo two >foo && git add foo && git commit -m two &&
-		git tag -f tmaster master &&
+		git tag -f tmain main &&
 		git push --mirror up
 	) &&
-	master_master=$(cd master && git show-ref -s --verify refs/tags/tmaster) &&
-	master_add=$(cd master && git show-ref -s --verify refs/tags/tadd) &&
-	mirror_master=$(cd mirror && git show-ref -s --verify refs/tags/tmaster) &&
+	main_main=$(cd main && git show-ref -s --verify refs/tags/tmain) &&
+	main_add=$(cd main && git show-ref -s --verify refs/tags/tadd) &&
+	mirror_main=$(cd mirror && git show-ref -s --verify refs/tags/tmain) &&
 	mirror_add=$(cd mirror && git show-ref -s --verify refs/tags/tadd) &&
-	test "$master_master" = "$mirror_master" &&
-	test "$master_add" = "$mirror_add" &&
+	test "$main_main" = "$mirror_main" &&
+	test "$main_add" = "$mirror_add" &&
 	(
 		cd mirror &&
 		invert git show-ref -s --verify refs/tags/tremove
@@ -230,10 +234,10 @@ test_expect_success 'remote.foo.mirror adds and removes branches' '
 
 	mk_repo_pair --mirror &&
 	(
-		cd master &&
+		cd main &&
 		echo one >foo && git add foo && git commit -m one &&
-		git branch keep master &&
-		git branch remove master &&
+		git branch keep main &&
+		git branch remove main &&
 		git push up &&
 		git branch -D remove &&
 		git push up
@@ -250,10 +254,10 @@ test_expect_success 'remote.foo.mirror=no has no effect' '
 
 	mk_repo_pair &&
 	(
-		cd master &&
+		cd main &&
 		echo one >foo && git add foo && git commit -m one &&
 		git config --add remote.up.mirror no &&
-		git branch keep master &&
+		git branch keep main &&
 		git push --mirror up &&
 		git branch -D keep &&
 		git push up :
@@ -268,10 +272,10 @@ test_expect_success 'remote.foo.mirror=no has no effect' '
 test_expect_success 'push to mirrored repository with refspec fails' '
 	mk_repo_pair &&
 	(
-		cd master &&
+		cd main &&
 		echo one >foo && git add foo && git commit -m one &&
 		git config --add remote.up.mirror true &&
-		test_must_fail git push up master
+		test_must_fail git push up main
 	)
 '
 
diff --git a/t/t5518-fetch-exit-status.sh b/t/t5518-fetch-exit-status.sh
index c2060bb..c131200 100755
--- a/t/t5518-fetch-exit-status.sh
+++ b/t/t5518-fetch-exit-status.sh
@@ -5,6 +5,10 @@
 
 test_description='fetch exit status test'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -17,20 +21,20 @@ test_expect_success setup '
 	echo side >file &&
 	git commit -a -m side &&
 
-	git checkout master &&
+	git checkout main &&
 	echo next >file &&
 	git commit -a -m next
 '
 
 test_expect_success 'non-fast-forward fetch' '
 
-	test_must_fail git fetch . master:side
+	test_must_fail git fetch . main:side
 
 '
 
 test_expect_success 'forced update' '
 
-	git fetch . +master:side
+	git fetch . +main:side
 
 '
 
diff --git a/t/t5519-push-alternates.sh b/t/t5519-push-alternates.sh
index 11fcd37..20ba604 100755
--- a/t/t5519-push-alternates.sh
+++ b/t/t5519-push-alternates.sh
@@ -2,6 +2,9 @@
 
 test_description='push to a repository that borrows from elsewhere'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -17,7 +20,7 @@ test_expect_success setup '
 		>file &&
 		git add . &&
 		git commit -m initial &&
-		git push ../alice-pub master
+		git push ../alice-pub main
 	) &&
 
 	# Project Bob is a fork of project Alice
@@ -31,7 +34,7 @@ test_expect_success setup '
 	git clone alice-pub bob-work &&
 	(
 		cd bob-work &&
-		git push ../bob-pub master
+		git push ../bob-pub main
 	)
 '
 
@@ -54,7 +57,7 @@ test_expect_success 'bob fetches from alice, works and pushes' '
 		# has at her public repository are available to it
 		# via its alternates.
 		cd bob-work &&
-		git pull ../alice-pub master &&
+		git pull ../alice-pub main &&
 		echo more bob >file &&
 		git commit -a -m third &&
 		git push ../bob-pub :
@@ -93,7 +96,7 @@ test_expect_success 'alice works and pushes again' '
 test_expect_success 'bob works and pushes' '
 	(
 		# This time Bob does not pull from Alice, and
-		# the master branch at her public repository points
+		# the main branch at her public repository points
 		# at a commit Bob does not know about.  This should
 		# not prevent the push by Bob from succeeding.
 		cd bob-work &&
@@ -122,11 +125,11 @@ test_expect_success 'alice works and pushes yet again' '
 test_expect_success 'bob works and pushes again' '
 	(
 		cd alice-pub &&
-		git cat-file commit master >../bob-work/commit
+		git cat-file commit main >../bob-work/commit
 	) &&
 	(
 		# This time Bob does not pull from Alice, and
-		# the master branch at her public repository points
+		# the main branch at her public repository points
 		# at a commit Bob does not fully know about, but
 		# he happens to have the commit object (but not the
 		# necessary tree) in his repository from Alice.
diff --git a/t/t5520-pull.sh b/t/t5520-pull.sh
index 9fae07c..47534f1 100755
--- a/t/t5520-pull.sh
+++ b/t/t5520-pull.sh
@@ -2,6 +2,9 @@
 
 test_description='pulling into void'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 modify () {
@@ -28,7 +31,7 @@ test_pull_autostash_fail () {
 	echo dirty >new_file &&
 	git add new_file &&
 	test_must_fail git pull "$@" . copy 2>err &&
-	test_i18ngrep -E "uncommitted changes.|overwritten by merge:" err
+	test_grep -E "uncommitted changes.|overwritten by merge:" err
 }
 
 test_expect_success setup '
@@ -48,11 +51,11 @@ test_expect_success 'pulling into void' '
 	test_cmp file cloned/file
 '
 
-test_expect_success 'pulling into void using master:master' '
+test_expect_success 'pulling into void using main:main' '
 	git init cloned-uho &&
 	(
 		cd cloned-uho &&
-		git pull .. master:master
+		git pull .. main:main
 	) &&
 	test_path_is_file file &&
 	test_path_is_file cloned-uho/file &&
@@ -64,7 +67,7 @@ test_expect_success 'pulling into void does not overwrite untracked files' '
 	(
 		cd cloned-untracked &&
 		echo untracked >file &&
-		test_must_fail git pull .. master &&
+		test_must_fail git pull .. main &&
 		echo untracked >expect &&
 		test_cmp expect file
 	)
@@ -76,7 +79,7 @@ test_expect_success 'pulling into void does not overwrite staged files' '
 		cd cloned-staged-colliding &&
 		echo "alternate content" >file &&
 		git add file &&
-		test_must_fail git pull .. master &&
+		test_must_fail git pull .. main &&
 		echo "alternate content" >expect &&
 		test_cmp expect file &&
 		git cat-file blob :file >file.index &&
@@ -90,7 +93,7 @@ test_expect_success 'pulling into void does not remove new staged files' '
 		cd cloned-staged-new &&
 		echo "new tracked file" >newfile &&
 		git add newfile &&
-		git pull .. master &&
+		git pull .. main &&
 		echo "new tracked file" >expect &&
 		test_cmp expect newfile &&
 		git cat-file blob :newfile >newfile.index &&
@@ -102,15 +105,15 @@ test_expect_success 'pulling into void must not create an octopus' '
 	git init cloned-octopus &&
 	(
 		cd cloned-octopus &&
-		test_must_fail git pull .. master master &&
+		test_must_fail git pull .. main main &&
 		test_path_is_missing file
 	)
 '
 
 test_expect_success 'test . as a remote' '
-	git branch copy master &&
+	git branch copy main &&
 	git config branch.copy.remote . &&
-	git config branch.copy.merge refs/heads/master &&
+	git config branch.copy.merge refs/heads/main &&
 	echo updated >file &&
 	git commit -a -m updated &&
 	git checkout copy &&
@@ -126,19 +129,19 @@ test_expect_success 'test . as a remote' '
 '
 
 test_expect_success 'the default remote . should not break explicit pull' '
-	git checkout -b second master^ &&
+	git checkout -b second main^ &&
 	echo modified >file &&
 	git commit -a -m modified &&
 	git checkout copy &&
 	git reset --hard HEAD^ &&
 	echo file >expect &&
 	test_cmp expect file &&
-	git pull . second &&
+	git pull --no-rebase . second &&
 	echo modified >expect &&
 	test_cmp expect file &&
 	git reflog -1 >reflog.actual &&
 	sed "s/^[0-9a-f][0-9a-f]*/OBJID/" reflog.actual >reflog.fuzzy &&
-	echo "OBJID HEAD@{0}: pull . second: Fast-forward" >reflog.expected &&
+	echo "OBJID HEAD@{0}: pull --no-rebase . second: Fast-forward" >reflog.expected &&
 	test_cmp reflog.expected reflog.fuzzy
 '
 
@@ -148,7 +151,7 @@ test_expect_success 'fail if wildcard spec does not match any refs' '
 	echo file >expect &&
 	test_cmp expect file &&
 	test_must_fail git pull . "refs/nonexisting1/*:refs/nonexisting2/*" 2>err &&
-	test_i18ngrep "no candidates for merging" err &&
+	test_grep "no candidates for merging" err &&
 	test_cmp expect file
 '
 
@@ -161,7 +164,7 @@ test_expect_success 'fail if no branches specified with non-default remote' '
 	test_cmp expect file &&
 	test_config branch.test.remote origin &&
 	test_must_fail git pull test_remote 2>err &&
-	test_i18ngrep "specify a branch on the command line" err &&
+	test_grep "specify a branch on the command line" err &&
 	test_cmp expect file
 '
 
@@ -173,7 +176,7 @@ test_expect_success 'fail if not on a branch' '
 	echo file >expect &&
 	test_cmp expect file &&
 	test_must_fail git pull 2>err &&
-	test_i18ngrep "not currently on a branch" err &&
+	test_grep "not currently on a branch" err &&
 	test_cmp expect file
 '
 
@@ -186,7 +189,7 @@ test_expect_success 'fail if no configuration for current branch' '
 	echo file >expect &&
 	test_cmp expect file &&
 	test_must_fail git pull 2>err &&
-	test_i18ngrep "no tracking information" err &&
+	test_grep "no tracking information" err &&
 	test_cmp expect file
 '
 
@@ -199,7 +202,7 @@ test_expect_success 'pull --all: fail if no configuration for current branch' '
 	echo file >expect &&
 	test_cmp expect file &&
 	test_must_fail git pull --all 2>err &&
-	test_i18ngrep "There is no tracking information" err &&
+	test_grep "There is no tracking information" err &&
 	test_cmp expect file
 '
 
@@ -211,10 +214,27 @@ test_expect_success 'fail if upstream branch does not exist' '
 	echo file >expect &&
 	test_cmp expect file &&
 	test_must_fail git pull 2>err &&
-	test_i18ngrep "no such ref was fetched" err &&
+	test_grep "no such ref was fetched" err &&
 	test_cmp expect file
 '
 
+test_expect_success 'fetch upstream branch even if refspec excludes it' '
+	# the branch names are not important here except that
+	# the first one must not be a prefix of the second,
+	# since otherwise the ref-prefix protocol extension
+	# would match both
+	git branch in-refspec HEAD^ &&
+	git branch not-in-refspec HEAD &&
+	git init -b in-refspec downstream &&
+	git -C downstream remote add -t in-refspec origin "file://$(pwd)/.git" &&
+	git -C downstream config branch.in-refspec.remote origin &&
+	git -C downstream config branch.in-refspec.merge refs/heads/not-in-refspec &&
+	git -C downstream pull &&
+	git rev-parse --verify not-in-refspec >expect &&
+	git -C downstream rev-parse --verify HEAD >actual &&
+	test_cmp expect actual
+'
+
 test_expect_success 'fail if the index has unresolved entries' '
 	git checkout -b third second^ &&
 	test_when_finished "git checkout -f copy && git branch -D third" &&
@@ -223,18 +243,18 @@ test_expect_success 'fail if the index has unresolved entries' '
 	test_commit modified2 file &&
 	git ls-files -u >unmerged &&
 	test_must_be_empty unmerged &&
-	test_must_fail git pull . second &&
+	test_must_fail git pull --no-rebase . second &&
 	git ls-files -u >unmerged &&
 	test_file_not_empty unmerged &&
 	cp file expected &&
 	test_must_fail git pull . second 2>err &&
-	test_i18ngrep "Pulling is not possible because you have unmerged files." err &&
+	test_grep "Pulling is not possible because you have unmerged files." err &&
 	test_cmp expected file &&
 	git add file &&
 	git ls-files -u >unmerged &&
 	test_must_be_empty unmerged &&
 	test_must_fail git pull . second 2>err &&
-	test_i18ngrep "You have not concluded your merge" err &&
+	test_grep "You have not concluded your merge" err &&
 	test_cmp expected file
 '
 
@@ -244,7 +264,7 @@ test_expect_success 'fast-forwards working tree if branch head is updated' '
 	echo file >expect &&
 	test_cmp expect file &&
 	git pull . second:third 2>err &&
-	test_i18ngrep "fetch updated the current branch head" err &&
+	test_grep "fetch updated the current branch head" err &&
 	echo modified >expect &&
 	test_cmp expect file &&
 	test_cmp_rev third second
@@ -257,7 +277,7 @@ test_expect_success 'fast-forward fails with conflicting work tree' '
 	test_cmp expect file &&
 	echo conflict >file &&
 	test_must_fail git pull . second:third 2>err &&
-	test_i18ngrep "Cannot fast-forward your working tree" err &&
+	test_grep "Cannot fast-forward your working tree" err &&
 	echo conflict >expect &&
 	test_cmp expect file &&
 	test_cmp_rev third second
@@ -327,6 +347,19 @@ test_expect_success '--rebase --autostash fast forward' '
 	test_cmp_rev HEAD to-rebase-ff
 '
 
+test_expect_success '--rebase with rebase.autostash succeeds on ff' '
+	test_when_finished "rm -fr src dst actual" &&
+	git init src &&
+	test_commit -C src "initial" file "content" &&
+	git clone src dst &&
+	test_commit -C src --printf "more_content" file "more content\ncontent\n" &&
+	echo "dirty" >>dst/file &&
+	test_config -C dst rebase.autostash true &&
+	git -C dst pull --rebase >actual 2>&1 &&
+	grep -q "Fast-forward" actual &&
+	grep -q "Applied autostash." actual
+'
+
 test_expect_success '--rebase with conflicts shows advice' '
 	test_when_finished "git rebase --abort; git checkout -f to-rebase" &&
 	git checkout -b seq &&
@@ -342,7 +375,7 @@ test_expect_success '--rebase with conflicts shows advice' '
 	test_tick &&
 	git commit -m "Create conflict" seq.txt &&
 	test_must_fail git pull --rebase . seq 2>err >out &&
-	test_i18ngrep "Resolve all conflicts manually" err
+	test_grep "Resolve all conflicts manually" err
 '
 
 test_expect_success 'failed --rebase shows advice' '
@@ -356,14 +389,14 @@ test_expect_success 'failed --rebase shows advice' '
 	git checkout -f -b fails-to-rebase HEAD^ &&
 	test_commit v2-without-cr file "2" file2-lf &&
 	test_must_fail git pull --rebase . diverging 2>err >out &&
-	test_i18ngrep "Resolve all conflicts manually" err
+	test_grep "Resolve all conflicts manually" err
 '
 
 test_expect_success '--rebase fails with multiple branches' '
 	git reset --hard before-rebase &&
-	test_must_fail git pull --rebase . copy master 2>err &&
+	test_must_fail git pull --rebase . copy main 2>err &&
 	test_cmp_rev HEAD before-rebase &&
-	test_i18ngrep "Cannot rebase onto multiple branches" err &&
+	test_grep "Cannot rebase onto multiple branches" err &&
 	echo modified >expect &&
 	git show HEAD:file >actual &&
 	test_cmp expect actual
@@ -406,37 +439,37 @@ test_expect_success 'pull --rebase --no-autostash & rebase.autostash unset' '
 
 test_expect_success 'pull succeeds with dirty working directory and merge.autostash set' '
 	test_config merge.autostash true &&
-	test_pull_autostash 2
+	test_pull_autostash 2 --no-rebase
 '
 
 test_expect_success 'pull --autostash & merge.autostash=true' '
 	test_config merge.autostash true &&
-	test_pull_autostash 2 --autostash
+	test_pull_autostash 2 --autostash --no-rebase
 '
 
 test_expect_success 'pull --autostash & merge.autostash=false' '
 	test_config merge.autostash false &&
-	test_pull_autostash 2 --autostash
+	test_pull_autostash 2 --autostash --no-rebase
 '
 
 test_expect_success 'pull --autostash & merge.autostash unset' '
 	test_unconfig merge.autostash &&
-	test_pull_autostash 2 --autostash
+	test_pull_autostash 2 --autostash --no-rebase
 '
 
 test_expect_success 'pull --no-autostash & merge.autostash=true' '
 	test_config merge.autostash true &&
-	test_pull_autostash_fail --no-autostash
+	test_pull_autostash_fail --no-autostash --no-rebase
 '
 
 test_expect_success 'pull --no-autostash & merge.autostash=false' '
 	test_config merge.autostash false &&
-	test_pull_autostash_fail --no-autostash
+	test_pull_autostash_fail --no-autostash --no-rebase
 '
 
 test_expect_success 'pull --no-autostash & merge.autostash unset' '
 	test_unconfig merge.autostash &&
-	test_pull_autostash_fail --no-autostash
+	test_pull_autostash_fail --no-autostash --no-rebase
 '
 
 test_expect_success 'pull.rebase' '
@@ -487,7 +520,7 @@ test_expect_success 'pull --rebase warns on --verify-signatures' '
 	echo new >expect &&
 	git show HEAD:file2 >actual &&
 	test_cmp expect actual &&
-	test_i18ngrep "ignoring --verify-signatures for rebase" err
+	test_grep "ignoring --verify-signatures for rebase" err
 '
 
 test_expect_success 'pull --rebase does not warn on --no-verify-signatures' '
@@ -497,10 +530,10 @@ test_expect_success 'pull --rebase does not warn on --no-verify-signatures' '
 	echo new >expect &&
 	git show HEAD:file2 >actual &&
 	test_cmp expect actual &&
-	test_i18ngrep ! "verify-signatures" err
+	test_grep ! "verify-signatures" err
 '
 
-# add a feature branch, keep-merge, that is merged into master, so the
+# add a feature branch, keep-merge, that is merged into main, so the
 # test can try preserving the merge commit (or not) with various
 # --rebase flags/pull.rebase settings.
 test_expect_success 'preserve merge setup' '
@@ -543,15 +576,6 @@ test_expect_success 'pull.rebase=1 is treated as true and flattens keep-merge' '
 	test_cmp expect actual
 '
 
-test_expect_success REBASE_P \
-	'pull.rebase=preserve rebases and merges keep-merge' '
-	git reset --hard before-preserve-rebase &&
-	test_config pull.rebase preserve &&
-	git pull . copy &&
-	test_cmp_rev HEAD^^ copy &&
-	test_cmp_rev HEAD^2 keep-merge
-'
-
 test_expect_success 'pull.rebase=interactive' '
 	write_script "$TRASH_DIRECTORY/fake-editor" <<-\EOF &&
 	echo I was here >fake.out &&
@@ -595,7 +619,7 @@ test_expect_success '--rebase=false create a new merge commit' '
 
 test_expect_success '--rebase=true rebases and flattens keep-merge' '
 	git reset --hard before-preserve-rebase &&
-	test_config pull.rebase preserve &&
+	test_config pull.rebase merges &&
 	git pull --rebase=true . copy &&
 	test_cmp_rev HEAD^^ copy &&
 	echo file3 >expect &&
@@ -603,23 +627,14 @@ test_expect_success '--rebase=true rebases and flattens keep-merge' '
 	test_cmp expect actual
 '
 
-test_expect_success REBASE_P \
-	'--rebase=preserve rebases and merges keep-merge' '
-	git reset --hard before-preserve-rebase &&
-	test_config pull.rebase true &&
-	git pull --rebase=preserve . copy &&
-	test_cmp_rev HEAD^^ copy &&
-	test_cmp_rev HEAD^2 keep-merge
-'
-
 test_expect_success '--rebase=invalid fails' '
 	git reset --hard before-preserve-rebase &&
 	test_must_fail git pull --rebase=invalid . copy
 '
 
-test_expect_success '--rebase overrides pull.rebase=preserve and flattens keep-merge' '
+test_expect_success '--rebase overrides pull.rebase=merges and flattens keep-merge' '
 	git reset --hard before-preserve-rebase &&
-	test_config pull.rebase preserve &&
+	test_config pull.rebase merges &&
 	git pull --rebase . copy &&
 	test_cmp_rev HEAD^^ copy &&
 	echo file3 >expect &&
@@ -699,12 +714,12 @@ test_expect_success 'pull --rebase dies early with dirty working directory' '
 '
 
 test_expect_success 'pull --rebase works on branch yet to be born' '
-	git rev-parse master >expect &&
+	git rev-parse main >expect &&
 	mkdir empty_repo &&
 	(
 		cd empty_repo &&
 		git init &&
-		git pull --rebase .. master &&
+		git pull --rebase .. main &&
 		git rev-parse HEAD >../actual
 	) &&
 	test_cmp expect actual
@@ -720,12 +735,12 @@ test_expect_success 'pull --rebase fails on unborn branch with staged changes' '
 		echo staged-file >expect &&
 		git ls-files >actual &&
 		test_cmp expect actual &&
-		test_must_fail git pull --rebase .. master 2>err &&
+		test_must_fail git pull --rebase .. main 2>err &&
 		git ls-files >actual &&
 		test_cmp expect actual &&
 		git show :staged-file >actual &&
 		test_cmp expect actual &&
-		test_i18ngrep "unborn branch with changes added to the index" err
+		test_grep "unborn branch with changes added to the index" err
 	)
 '
 
@@ -743,14 +758,8 @@ test_expect_success 'pull --rebase fails on corrupt HEAD' '
 '
 
 test_expect_success 'setup for detecting upstreamed changes' '
-	mkdir src &&
-	(
-		cd src &&
-		git init &&
-		printf "1\n2\n3\n4\n5\n6\n7\n8\n9\n10\n" > stuff &&
-		git add stuff &&
-		git commit -m "Initial revision"
-	) &&
+	test_create_repo src &&
+	test_commit -C src --printf one stuff "1\n2\n3\n4\n5\n6\n7\n8\n9\n10\n" &&
 	git clone src dst &&
 	(
 		cd src &&
@@ -779,7 +788,7 @@ test_expect_success 'setup for avoiding reapplying old patches' '
 	(
 		cd dst &&
 		test_might_fail git rebase --abort &&
-		git reset --hard origin/master
+		git reset --hard origin/main
 	) &&
 	git clone --bare src src-replace.git &&
 	rm -rf src &&
diff --git a/t/t5521-pull-options.sh b/t/t5521-pull-options.sh
index 159afa7..db00c43 100755
--- a/t/t5521-pull-options.sh
+++ b/t/t5521-pull-options.sh
@@ -2,6 +2,10 @@
 
 test_description='pull options'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -85,6 +89,13 @@ test_expect_success 'git pull --cleanup errors early on invalid argument' '
 	test -s err)
 '
 
+test_expect_success 'git pull --no-write-fetch-head fails' '
+	mkdir clonedwfh &&
+	(cd clonedwfh && git init &&
+	test_expect_code 129 git pull --no-write-fetch-head "../parent" >out 2>err &&
+	test_must_be_empty out &&
+	test_grep "no-write-fetch-head" err)
+'
 
 test_expect_success 'git pull --force' '
 	mkdir clonedoldstyle &&
@@ -92,18 +103,18 @@ test_expect_success 'git pull --force' '
 	cat >>.git/config <<-\EOF &&
 	[remote "one"]
 		url = ../parent
-		fetch = refs/heads/master:refs/heads/mirror
+		fetch = refs/heads/main:refs/heads/mirror
 	[remote "two"]
 		url = ../parent
-		fetch = refs/heads/master:refs/heads/origin
-	[branch "master"]
+		fetch = refs/heads/main:refs/heads/origin
+	[branch "main"]
 		remote = two
-		merge = refs/heads/master
+		merge = refs/heads/main
 	EOF
 	git pull two &&
 	test_commit A &&
 	git branch -f origin &&
-	git pull --all --force
+	git pull --no-rebase --all --force
 	)
 '
 
@@ -117,9 +128,9 @@ test_expect_success 'git pull --all' '
 	[remote "two"]
 		url = ../parent
 		fetch = refs/heads/*:refs/remotes/two/*
-	[branch "master"]
+	[branch "main"]
 		remote = one
-		merge = refs/heads/master
+		merge = refs/heads/main
 	EOF
 	git pull --all
 	)
@@ -132,7 +143,7 @@ test_expect_success 'git pull --dry-run' '
 		cd clonedry &&
 		git pull --dry-run ../parent &&
 		test_path_is_missing .git/FETCH_HEAD &&
-		test_path_is_missing .git/refs/heads/master &&
+		test_ref_missing refs/heads/main &&
 		test_path_is_missing .git/index &&
 		test_path_is_missing file
 	)
@@ -146,7 +157,7 @@ test_expect_success 'git pull --all --dry-run' '
 		git remote add origin ../parent &&
 		git pull --all --dry-run &&
 		test_path_is_missing .git/FETCH_HEAD &&
-		test_path_is_missing .git/refs/remotes/origin/master &&
+		test_ref_missing refs/remotes/origin/main &&
 		test_path_is_missing .git/index &&
 		test_path_is_missing file
 	)
@@ -169,7 +180,7 @@ test_expect_success 'git pull --allow-unrelated-histories' '
 	(
 		cd dst &&
 		test_must_fail git pull ../src side &&
-		git pull --allow-unrelated-histories ../src side
+		git pull --no-rebase --allow-unrelated-histories ../src side
 	)
 '
 
@@ -218,4 +229,28 @@ test_expect_success 'git pull --no-signoff flag cancels --signoff flag' '
 	test_must_be_empty actual
 '
 
+test_expect_success 'git pull --no-verify flag passed to merge' '
+	test_when_finished "rm -fr src dst actual" &&
+	git init src &&
+	test_commit -C src one &&
+	git clone src dst &&
+	test_hook -C dst commit-msg <<-\EOF &&
+	false
+	EOF
+	test_commit -C src two &&
+	git -C dst pull --no-ff --no-verify
+'
+
+test_expect_success 'git pull --no-verify --verify passed to merge' '
+	test_when_finished "rm -fr src dst actual" &&
+	git init src &&
+	test_commit -C src one &&
+	git clone src dst &&
+	test_hook -C dst commit-msg <<-\EOF &&
+	false
+	EOF
+	test_commit -C src two &&
+	test_must_fail git -C dst pull --no-ff --no-verify --verify
+'
+
 test_done
diff --git a/t/t5522-pull-symlink.sh b/t/t5522-pull-symlink.sh
index bcff460..cc5496e 100755
--- a/t/t5522-pull-symlink.sh
+++ b/t/t5522-pull-symlink.sh
@@ -2,6 +2,7 @@
 
 test_description='pulling from symlinked subdir'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # The scenario we are building:
@@ -78,7 +79,9 @@ test_expect_success SYMLINKS 'pushing from symlinked subdir' '
 		git commit -m push ./file &&
 		git push
 	) &&
-	test push = $(git show HEAD:subdir/file)
+	echo push >expect &&
+	git show HEAD:subdir/file >actual &&
+	test_cmp expect actual
 '
 
 test_done
diff --git a/t/t5523-push-upstream.sh b/t/t5523-push-upstream.sh
index c0df81a..1f859ad 100755
--- a/t/t5523-push-upstream.sh
+++ b/t/t5523-push-upstream.sh
@@ -1,6 +1,10 @@
 #!/bin/sh
 
 test_description='push with --set-upstream'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-terminal.sh
 
@@ -26,43 +30,51 @@ check_config() {
 	test_cmp expect.$1 actual.$1
 }
 
-test_expect_success 'push -u master:master' '
-	git push -u upstream master:master &&
-	check_config master upstream refs/heads/master
+test_expect_success 'push -u main:main' '
+	git push -u upstream main:main &&
+	check_config main upstream refs/heads/main
 '
 
-test_expect_success 'push -u master:other' '
-	git push -u upstream master:other &&
-	check_config master upstream refs/heads/other
+test_expect_success 'push -u main:other' '
+	git push -u upstream main:other &&
+	check_config main upstream refs/heads/other
 '
 
-test_expect_success 'push -u --dry-run master:otherX' '
-	git push -u --dry-run upstream master:otherX &&
-	check_config master upstream refs/heads/other
+test_expect_success 'push -u --dry-run main:otherX' '
+	git push -u --dry-run upstream main:otherX &&
+	check_config main upstream refs/heads/other
 '
 
-test_expect_success 'push -u master2:master2' '
-	git branch master2 &&
-	git push -u upstream master2:master2 &&
-	check_config master2 upstream refs/heads/master2
+test_expect_success 'push -u topic_2:topic_2' '
+	git branch topic_2 &&
+	git push -u upstream topic_2:topic_2 &&
+	check_config topic_2 upstream refs/heads/topic_2
 '
 
-test_expect_success 'push -u master2:other2' '
-	git push -u upstream master2:other2 &&
-	check_config master2 upstream refs/heads/other2
+test_expect_success 'push -u topic_2:other2' '
+	git push -u upstream topic_2:other2 &&
+	check_config topic_2 upstream refs/heads/other2
 '
 
-test_expect_success 'push -u :master2' '
-	git push -u upstream :master2 &&
-	check_config master2 upstream refs/heads/other2
+test_expect_success 'push -u :topic_2' '
+	git push -u upstream :topic_2 &&
+	check_config topic_2 upstream refs/heads/other2
 '
 
-test_expect_success 'push -u --all' '
+test_expect_success 'push -u --all(the same behavior with--branches)' '
 	git branch all1 &&
 	git branch all2 &&
 	git push -u --all &&
 	check_config all1 upstream refs/heads/all1 &&
-	check_config all2 upstream refs/heads/all2
+	check_config all2 upstream refs/heads/all2 &&
+	git config --get-regexp branch.all* > expect &&
+	git config --remove-section branch.all1 &&
+	git config --remove-section branch.all2 &&
+	git push -u --branches &&
+	check_config all1 upstream refs/heads/all1 &&
+	check_config all2 upstream refs/heads/all2 &&
+	git config --get-regexp branch.all* > actual &&
+	test_cmp expect actual
 '
 
 test_expect_success 'push -u HEAD' '
@@ -74,45 +86,52 @@ test_expect_success 'push -u HEAD' '
 test_expect_success TTY 'progress messages go to tty' '
 	ensure_fresh_upstream &&
 
-	test_terminal git push -u upstream master >out 2>err &&
-	test_i18ngrep "Writing objects" err
+	test_terminal git push -u upstream main >out 2>err &&
+	test_grep "Writing objects" err
 '
 
 test_expect_success 'progress messages do not go to non-tty' '
 	ensure_fresh_upstream &&
 
 	# skip progress messages, since stderr is non-tty
-	git push -u upstream master >out 2>err &&
-	test_i18ngrep ! "Writing objects" err
+	git push -u upstream main >out 2>err &&
+	test_grep ! "Writing objects" err
 '
 
 test_expect_success 'progress messages go to non-tty (forced)' '
 	ensure_fresh_upstream &&
 
 	# force progress messages to stderr, even though it is non-tty
-	git push -u --progress upstream master >out 2>err &&
-	test_i18ngrep "Writing objects" err
+	git push -u --progress upstream main >out 2>err &&
+	test_grep "Writing objects" err
 '
 
 test_expect_success TTY 'push -q suppresses progress' '
 	ensure_fresh_upstream &&
 
-	test_terminal git push -u -q upstream master >out 2>err &&
-	test_i18ngrep ! "Writing objects" err
+	test_terminal git push -u -q upstream main >out 2>err &&
+	test_grep ! "Writing objects" err
 '
 
 test_expect_success TTY 'push --no-progress suppresses progress' '
 	ensure_fresh_upstream &&
 
-	test_terminal git push -u --no-progress upstream master >out 2>err &&
-	test_i18ngrep ! "Unpacking objects" err &&
-	test_i18ngrep ! "Writing objects" err
+	test_terminal git push -u --no-progress upstream main >out 2>err &&
+	test_grep ! "Unpacking objects" err &&
+	test_grep ! "Writing objects" err
 '
 
 test_expect_success TTY 'quiet push' '
 	ensure_fresh_upstream &&
 
-	test_terminal git push --quiet --no-progress upstream master 2>&1 | tee output &&
+	test_terminal git push --quiet --no-progress upstream main 2>&1 | tee output &&
+	test_must_be_empty output
+'
+
+test_expect_success TTY 'quiet push -u' '
+	ensure_fresh_upstream &&
+
+	test_terminal git push --quiet -u --no-progress upstream main 2>&1 | tee output &&
 	test_must_be_empty output
 '
 
diff --git a/t/t5524-pull-msg.sh b/t/t5524-pull-msg.sh
index c278ada..56716e2 100755
--- a/t/t5524-pull-msg.sh
+++ b/t/t5524-pull-msg.sh
@@ -2,6 +2,7 @@
 
 test_description='git pull message generation'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 dollar='$Dollar'
@@ -28,7 +29,7 @@ test_expect_success setup '
 test_expect_success pull '
 (
 	cd cloned &&
-	git pull --log &&
+	git pull --no-rebase --log &&
 	git log -2 &&
 	git cat-file commit HEAD >result &&
 	grep Dollar result
@@ -41,7 +42,7 @@ test_expect_success '--log=1 limits shortlog length' '
 	git reset --hard HEAD^ &&
 	test "$(cat afile)" = original &&
 	test "$(cat bfile)" = added &&
-	git pull --log=1 &&
+	git pull --no-rebase --log=1 &&
 	git log -3 &&
 	git cat-file commit HEAD >result &&
 	grep Dollar result &&
diff --git a/t/t5525-fetch-tagopt.sh b/t/t5525-fetch-tagopt.sh
index 45815f7..3a28f1d 100755
--- a/t/t5525-fetch-tagopt.sh
+++ b/t/t5525-fetch-tagopt.sh
@@ -2,6 +2,7 @@
 
 test_description='tagopt variable affects "git fetch" and is overridden by commandline.'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 setup_clone () {
diff --git a/t/t5526-fetch-submodules.sh b/t/t5526-fetch-submodules.sh
index 63205df..5e56620 100755
--- a/t/t5526-fetch-submodules.sh
+++ b/t/t5526-fetch-submodules.sh
@@ -3,45 +3,139 @@
 
 test_description='Recursive "git fetch" for submodules'
 
+GIT_TEST_FATAL_REGISTER_SUBMODULE_ODB=1
+export GIT_TEST_FATAL_REGISTER_SUBMODULE_ODB
+
 . ./test-lib.sh
 
 pwd=$(pwd)
 
-add_upstream_commit() {
+write_expected_sub () {
+	NEW_HEAD=$1 &&
+	SUPER_HEAD=$2 &&
+	cat >"$pwd/expect.err.sub" <<-EOF
+	Fetching submodule submodule${SUPER_HEAD:+ at commit $SUPER_HEAD}
+	From $pwd/submodule
+	   OLD_HEAD..$NEW_HEAD  sub        -> origin/sub
+	EOF
+}
+
+write_expected_sub2 () {
+	NEW_HEAD=$1 &&
+	SUPER_HEAD=$2 &&
+	cat >"$pwd/expect.err.sub2" <<-EOF
+	Fetching submodule submodule2${SUPER_HEAD:+ at commit $SUPER_HEAD}
+	From $pwd/submodule2
+	   OLD_HEAD..$NEW_HEAD  sub2       -> origin/sub2
+	EOF
+}
+
+write_expected_deep () {
+	NEW_HEAD=$1 &&
+	SUB_HEAD=$2 &&
+	cat >"$pwd/expect.err.deep" <<-EOF
+	Fetching submodule submodule/subdir/deepsubmodule${SUB_HEAD:+ at commit $SUB_HEAD}
+	From $pwd/deepsubmodule
+	   OLD_HEAD..$NEW_HEAD  deep       -> origin/deep
+	EOF
+}
+
+write_expected_super () {
+	NEW_HEAD=$1 &&
+	cat >"$pwd/expect.err.super" <<-EOF
+	From $pwd/.
+	   OLD_HEAD..$NEW_HEAD  super      -> origin/super
+	EOF
+}
+
+# For each submodule in the test setup, this creates a commit and writes
+# a file that contains the expected err if that new commit were fetched.
+# These output files get concatenated in the right order by
+# verify_fetch_result().
+add_submodule_commits () {
 	(
 		cd submodule &&
-		head1=$(git rev-parse --short HEAD) &&
 		echo new >> subfile &&
 		test_tick &&
 		git add subfile &&
 		git commit -m new subfile &&
-		head2=$(git rev-parse --short HEAD) &&
-		echo "Fetching submodule submodule" > ../expect.err &&
-		echo "From $pwd/submodule" >> ../expect.err &&
-		echo "   $head1..$head2  master     -> origin/master" >> ../expect.err
+		new_head=$(git rev-parse --short HEAD) &&
+		write_expected_sub $new_head
 	) &&
 	(
 		cd deepsubmodule &&
-		head1=$(git rev-parse --short HEAD) &&
 		echo new >> deepsubfile &&
 		test_tick &&
 		git add deepsubfile &&
 		git commit -m new deepsubfile &&
-		head2=$(git rev-parse --short HEAD) &&
-		echo "Fetching submodule submodule/subdir/deepsubmodule" >> ../expect.err
-		echo "From $pwd/deepsubmodule" >> ../expect.err &&
-		echo "   $head1..$head2  master     -> origin/master" >> ../expect.err
+		new_head=$(git rev-parse --short HEAD) &&
+		write_expected_deep $new_head
 	)
 }
 
+# For each superproject in the test setup, update its submodule, add the
+# submodule and create a new commit with the submodule change.
+#
+# This requires add_submodule_commits() to be called first, otherwise
+# the submodules will not have changed and cannot be "git add"-ed.
+add_superproject_commits () {
+	(
+		cd submodule &&
+		(
+			cd subdir/deepsubmodule &&
+			git fetch &&
+			git checkout -q FETCH_HEAD
+		) &&
+		git add subdir/deepsubmodule &&
+		git commit -m "new deep submodule"
+	) &&
+	git add submodule &&
+	git commit -m "new submodule" &&
+	super_head=$(git rev-parse --short HEAD) &&
+	sub_head=$(git -C submodule rev-parse --short HEAD) &&
+	write_expected_super $super_head &&
+	write_expected_sub $sub_head
+}
+
+# Verifies that the expected repositories were fetched. This is done by
+# concatenating the files expect.err.[super|sub|deep] in the correct
+# order and comparing it to the actual stderr.
+#
+# If a repo should not be fetched in the test, its corresponding
+# expect.err file should be rm-ed.
+verify_fetch_result () {
+	ACTUAL_ERR=$1 &&
+	rm -f expect.err.combined &&
+	if test -f expect.err.super
+	then
+		cat expect.err.super >>expect.err.combined
+	fi &&
+	if test -f expect.err.sub
+	then
+		cat expect.err.sub >>expect.err.combined
+	fi &&
+	if test -f expect.err.deep
+	then
+		cat expect.err.deep >>expect.err.combined
+	fi &&
+	if test -f expect.err.sub2
+	then
+		cat expect.err.sub2 >>expect.err.combined
+	fi &&
+	sed -e 's/[0-9a-f][0-9a-f]*\.\./OLD_HEAD\.\./' "$ACTUAL_ERR" >actual.err.cmp &&
+	test_cmp expect.err.combined actual.err.cmp
+}
+
 test_expect_success setup '
+	git config --global protocol.file.allow always &&
 	mkdir deepsubmodule &&
 	(
 		cd deepsubmodule &&
 		git init &&
 		echo deepsubcontent > deepsubfile &&
 		git add deepsubfile &&
-		git commit -m new deepsubfile
+		git commit -m new deepsubfile &&
+		git branch -M deep
 	) &&
 	mkdir submodule &&
 	(
@@ -50,10 +144,12 @@ test_expect_success setup '
 		echo subcontent > subfile &&
 		git add subfile &&
 		git submodule add "$pwd/deepsubmodule" subdir/deepsubmodule &&
-		git commit -a -m new
+		git commit -a -m new &&
+		git branch -M sub
 	) &&
 	git submodule add "$pwd/submodule" submodule &&
 	git commit -am initial &&
+	git branch -M super &&
 	git clone . downstream &&
 	(
 		cd downstream &&
@@ -62,38 +158,52 @@ test_expect_success setup '
 '
 
 test_expect_success "fetch --recurse-submodules recurses into submodules" '
-	add_upstream_commit &&
+	add_submodule_commits &&
 	(
 		cd downstream &&
 		git fetch --recurse-submodules >../actual.out 2>../actual.err
 	) &&
 	test_must_be_empty actual.out &&
-	test_i18ncmp expect.err actual.err
+	verify_fetch_result actual.err
+'
+
+test_expect_success "fetch --recurse-submodules honors --no-write-fetch-head" '
+	(
+		cd downstream &&
+		git submodule foreach --recursive \
+		sh -c "cd \"\$(git rev-parse --git-dir)\" && rm -f FETCH_HEAD" &&
+
+		git fetch --recurse-submodules --no-write-fetch-head &&
+
+		git submodule foreach --recursive \
+		sh -c "cd \"\$(git rev-parse --git-dir)\" && ! test -f FETCH_HEAD"
+	)
 '
 
 test_expect_success "submodule.recurse option triggers recursive fetch" '
-	add_upstream_commit &&
+	add_submodule_commits &&
 	(
 		cd downstream &&
 		git -c submodule.recurse fetch >../actual.out 2>../actual.err
 	) &&
 	test_must_be_empty actual.out &&
-	test_i18ncmp expect.err actual.err
+	verify_fetch_result actual.err
 '
 
 test_expect_success "fetch --recurse-submodules -j2 has the same output behaviour" '
-	add_upstream_commit &&
+	test_when_finished "rm -f trace.out" &&
+	add_submodule_commits &&
 	(
 		cd downstream &&
 		GIT_TRACE="$TRASH_DIRECTORY/trace.out" git fetch --recurse-submodules -j2 2>../actual.err
 	) &&
 	test_must_be_empty actual.out &&
-	test_i18ncmp expect.err actual.err &&
+	verify_fetch_result actual.err &&
 	grep "2 tasks" trace.out
 '
 
 test_expect_success "fetch alone only fetches superproject" '
-	add_upstream_commit &&
+	add_submodule_commits &&
 	(
 		cd downstream &&
 		git fetch >../actual.out 2>../actual.err
@@ -118,11 +228,11 @@ test_expect_success "using fetchRecurseSubmodules=true in .gitmodules recurses i
 		git fetch >../actual.out 2>../actual.err
 	) &&
 	test_must_be_empty actual.out &&
-	test_i18ncmp expect.err actual.err
+	verify_fetch_result actual.err
 '
 
 test_expect_success "--no-recurse-submodules overrides .gitmodules config" '
-	add_upstream_commit &&
+	add_submodule_commits &&
 	(
 		cd downstream &&
 		git fetch --no-recurse-submodules >../actual.out 2>../actual.err
@@ -149,7 +259,7 @@ test_expect_success "--recurse-submodules overrides fetchRecurseSubmodules setti
 		git config --unset submodule.submodule.fetchRecurseSubmodules
 	) &&
 	test_must_be_empty actual.out &&
-	test_i18ncmp expect.err actual.err
+	verify_fetch_result actual.err
 '
 
 test_expect_success "--quiet propagates to submodules" '
@@ -171,13 +281,13 @@ test_expect_success "--quiet propagates to parallel submodules" '
 '
 
 test_expect_success "--dry-run propagates to submodules" '
-	add_upstream_commit &&
+	add_submodule_commits &&
 	(
 		cd downstream &&
 		git fetch --recurse-submodules --dry-run >../actual.out 2>../actual.err
 	) &&
 	test_must_be_empty actual.out &&
-	test_i18ncmp expect.err actual.err
+	verify_fetch_result actual.err
 '
 
 test_expect_success "Without --dry-run propagates to submodules" '
@@ -186,22 +296,22 @@ test_expect_success "Without --dry-run propagates to submodules" '
 		git fetch --recurse-submodules >../actual.out 2>../actual.err
 	) &&
 	test_must_be_empty actual.out &&
-	test_i18ncmp expect.err actual.err
+	verify_fetch_result actual.err
 '
 
 test_expect_success "recurseSubmodules=true propagates into submodules" '
-	add_upstream_commit &&
+	add_submodule_commits &&
 	(
 		cd downstream &&
 		git config fetch.recurseSubmodules true &&
 		git fetch >../actual.out 2>../actual.err
 	) &&
 	test_must_be_empty actual.out &&
-	test_i18ncmp expect.err actual.err
+	verify_fetch_result actual.err
 '
 
 test_expect_success "--recurse-submodules overrides config in submodule" '
-	add_upstream_commit &&
+	add_submodule_commits &&
 	(
 		cd downstream &&
 		(
@@ -211,11 +321,11 @@ test_expect_success "--recurse-submodules overrides config in submodule" '
 		git fetch --recurse-submodules >../actual.out 2>../actual.err
 	) &&
 	test_must_be_empty actual.out &&
-	test_i18ncmp expect.err actual.err
+	verify_fetch_result actual.err
 '
 
 test_expect_success "--no-recurse-submodules overrides config setting" '
-	add_upstream_commit &&
+	add_submodule_commits &&
 	(
 		cd downstream &&
 		git config fetch.recurseSubmodules true &&
@@ -240,36 +350,34 @@ test_expect_success "Recursion doesn't happen when no new commits are fetched in
 '
 
 test_expect_success "Recursion stops when no new submodule commits are fetched" '
-	head1=$(git rev-parse --short HEAD) &&
 	git add submodule &&
 	git commit -m "new submodule" &&
-	head2=$(git rev-parse --short HEAD) &&
-	echo "From $pwd/." > expect.err.sub &&
-	echo "   $head1..$head2  master     -> origin/master" >>expect.err.sub &&
-	head -3 expect.err >> expect.err.sub &&
+	new_head=$(git rev-parse --short HEAD) &&
+	write_expected_super $new_head &&
+	rm expect.err.deep &&
 	(
 		cd downstream &&
 		git fetch >../actual.out 2>../actual.err
 	) &&
-	test_i18ncmp expect.err.sub actual.err &&
+	verify_fetch_result actual.err &&
 	test_must_be_empty actual.out
 '
 
 test_expect_success "Recursion doesn't happen when new superproject commits don't change any submodules" '
-	add_upstream_commit &&
-	head1=$(git rev-parse --short HEAD) &&
+	add_submodule_commits &&
 	echo a > file &&
 	git add file &&
 	git commit -m "new file" &&
-	head2=$(git rev-parse --short HEAD) &&
-	echo "From $pwd/." > expect.err.file &&
-	echo "   $head1..$head2  master     -> origin/master" >> expect.err.file &&
+	new_head=$(git rev-parse --short HEAD) &&
+	write_expected_super $new_head &&
+	rm expect.err.sub &&
+	rm expect.err.deep &&
 	(
 		cd downstream &&
 		git fetch >../actual.out 2>../actual.err
 	) &&
 	test_must_be_empty actual.out &&
-	test_i18ncmp expect.err.file actual.err
+	verify_fetch_result actual.err
 '
 
 test_expect_success "Recursion picks up config in submodule" '
@@ -281,14 +389,11 @@ test_expect_success "Recursion picks up config in submodule" '
 			git config fetch.recurseSubmodules true
 		)
 	) &&
-	add_upstream_commit &&
-	head1=$(git rev-parse --short HEAD) &&
+	add_submodule_commits &&
 	git add submodule &&
 	git commit -m "new submodule" &&
-	head2=$(git rev-parse --short HEAD) &&
-	echo "From $pwd/." > expect.err.sub &&
-	echo "   $head1..$head2  master     -> origin/master" >> expect.err.sub &&
-	cat expect.err >> expect.err.sub &&
+	new_head=$(git rev-parse --short HEAD) &&
+	write_expected_super $new_head &&
 	(
 		cd downstream &&
 		git fetch >../actual.out 2>../actual.err &&
@@ -297,60 +402,23 @@ test_expect_success "Recursion picks up config in submodule" '
 			git config --unset fetch.recurseSubmodules
 		)
 	) &&
-	test_i18ncmp expect.err.sub actual.err &&
+	verify_fetch_result actual.err &&
 	test_must_be_empty actual.out
 '
 
 test_expect_success "Recursion picks up all submodules when necessary" '
-	add_upstream_commit &&
-	(
-		cd submodule &&
-		(
-			cd subdir/deepsubmodule &&
-			git fetch &&
-			git checkout -q FETCH_HEAD
-		) &&
-		head1=$(git rev-parse --short HEAD^) &&
-		git add subdir/deepsubmodule &&
-		git commit -m "new deepsubmodule" &&
-		head2=$(git rev-parse --short HEAD) &&
-		echo "Fetching submodule submodule" > ../expect.err.sub &&
-		echo "From $pwd/submodule" >> ../expect.err.sub &&
-		echo "   $head1..$head2  master     -> origin/master" >> ../expect.err.sub
-	) &&
-	head1=$(git rev-parse --short HEAD) &&
-	git add submodule &&
-	git commit -m "new submodule" &&
-	head2=$(git rev-parse --short HEAD) &&
-	echo "From $pwd/." > expect.err.2 &&
-	echo "   $head1..$head2  master     -> origin/master" >> expect.err.2 &&
-	cat expect.err.sub >> expect.err.2 &&
-	tail -3 expect.err >> expect.err.2 &&
+	add_submodule_commits &&
+	add_superproject_commits &&
 	(
 		cd downstream &&
 		git fetch >../actual.out 2>../actual.err
 	) &&
-	test_i18ncmp expect.err.2 actual.err &&
+	verify_fetch_result actual.err &&
 	test_must_be_empty actual.out
 '
 
 test_expect_success "'--recurse-submodules=on-demand' doesn't recurse when no new commits are fetched in the superproject (and ignores config)" '
-	add_upstream_commit &&
-	(
-		cd submodule &&
-		(
-			cd subdir/deepsubmodule &&
-			git fetch &&
-			git checkout -q FETCH_HEAD
-		) &&
-		head1=$(git rev-parse --short HEAD^) &&
-		git add subdir/deepsubmodule &&
-		git commit -m "new deepsubmodule" &&
-		head2=$(git rev-parse --short HEAD) &&
-		echo Fetching submodule submodule > ../expect.err.sub &&
-		echo "From $pwd/submodule" >> ../expect.err.sub &&
-		echo "   $head1..$head2  master     -> origin/master" >> ../expect.err.sub
-	) &&
+	add_submodule_commits &&
 	(
 		cd downstream &&
 		git config fetch.recurseSubmodules true &&
@@ -362,15 +430,8 @@ test_expect_success "'--recurse-submodules=on-demand' doesn't recurse when no ne
 '
 
 test_expect_success "'--recurse-submodules=on-demand' recurses as deep as necessary (and ignores config)" '
-	head1=$(git rev-parse --short HEAD) &&
-	git add submodule &&
-	git commit -m "new submodule" &&
-	head2=$(git rev-parse --short HEAD) &&
-	tail -3 expect.err > expect.err.deepsub &&
-	echo "From $pwd/." > expect.err &&
-	echo "   $head1..$head2  master     -> origin/master" >>expect.err &&
-	cat expect.err.sub >> expect.err &&
-	cat expect.err.deepsub >> expect.err &&
+	add_submodule_commits &&
+	add_superproject_commits &&
 	(
 		cd downstream &&
 		git config fetch.recurseSubmodules false &&
@@ -386,24 +447,165 @@ test_expect_success "'--recurse-submodules=on-demand' recurses as deep as necess
 		)
 	) &&
 	test_must_be_empty actual.out &&
-	test_i18ncmp expect.err actual.err
+	verify_fetch_result actual.err
+'
+
+# These tests verify that we can fetch submodules that aren't in the
+# index.
+#
+# First, test the simple case where the index is empty and we only fetch
+# submodules that are not in the index.
+test_expect_success 'setup downstream branch without submodules' '
+	(
+		cd downstream &&
+		git checkout --recurse-submodules -b no-submodules &&
+		git rm .gitmodules &&
+		git rm submodule &&
+		git commit -m "no submodules" &&
+		git checkout --recurse-submodules super
+	)
+'
+
+test_expect_success "'--recurse-submodules=on-demand' should fetch submodule commits if the submodule is changed but the index has no submodules" '
+	add_submodule_commits &&
+	add_superproject_commits &&
+	# Fetch the new superproject commit
+	(
+		cd downstream &&
+		git switch --recurse-submodules no-submodules &&
+		git fetch --recurse-submodules=on-demand >../actual.out 2>../actual.err
+	) &&
+	super_head=$(git rev-parse --short HEAD) &&
+	sub_head=$(git -C submodule rev-parse --short HEAD) &&
+	deep_head=$(git -C submodule/subdir/deepsubmodule rev-parse --short HEAD) &&
+
+	# assert that these are fetched from commits, not the index
+	write_expected_sub $sub_head $super_head &&
+	write_expected_deep $deep_head $sub_head &&
+
+	test_must_be_empty actual.out &&
+	verify_fetch_result actual.err
+'
+
+test_expect_success "'--recurse-submodules' should fetch submodule commits if the submodule is changed but the index has no submodules" '
+	add_submodule_commits &&
+	add_superproject_commits &&
+	# Fetch the new superproject commit
+	(
+		cd downstream &&
+		git switch --recurse-submodules no-submodules &&
+		git fetch --recurse-submodules >../actual.out 2>../actual.err
+	) &&
+	super_head=$(git rev-parse --short HEAD) &&
+	sub_head=$(git -C submodule rev-parse --short HEAD) &&
+	deep_head=$(git -C submodule/subdir/deepsubmodule rev-parse --short HEAD) &&
+
+	# assert that these are fetched from commits, not the index
+	write_expected_sub $sub_head $super_head &&
+	write_expected_deep $deep_head $sub_head &&
+
+	test_must_be_empty actual.out &&
+	verify_fetch_result actual.err
+'
+
+test_expect_success "'--recurse-submodules' should ignore changed, inactive submodules" '
+	add_submodule_commits &&
+	add_superproject_commits &&
+
+	# Fetch the new superproject commit
+	(
+		cd downstream &&
+		git switch --recurse-submodules no-submodules &&
+		git -c submodule.submodule.active=false fetch --recurse-submodules >../actual.out 2>../actual.err
+	) &&
+	test_must_be_empty actual.out &&
+	super_head=$(git rev-parse --short HEAD) &&
+	write_expected_super $super_head &&
+	# Neither should be fetched because the submodule is inactive
+	rm expect.err.sub &&
+	rm expect.err.deep &&
+	verify_fetch_result actual.err
+'
+
+# Now that we know we can fetch submodules that are not in the index,
+# test that we can fetch index and non-index submodules in the same
+# operation.
+test_expect_success 'setup downstream branch with other submodule' '
+	mkdir submodule2 &&
+	(
+		cd submodule2 &&
+		git init &&
+		echo sub2content >sub2file &&
+		git add sub2file &&
+		git commit -a -m new &&
+		git branch -M sub2
+	) &&
+	git checkout -b super-sub2-only &&
+	git submodule add "$pwd/submodule2" submodule2 &&
+	git commit -m "add sub2" &&
+	git checkout super &&
+	(
+		cd downstream &&
+		git fetch --recurse-submodules origin &&
+		git checkout super-sub2-only &&
+		# Explicitly run "git submodule update" because sub2 is new
+		# and has not been cloned.
+		git submodule update --init &&
+		git checkout --recurse-submodules super
+	)
+'
+
+test_expect_success "'--recurse-submodules' should fetch submodule commits in changed submodules and the index" '
+	test_when_finished "rm expect.err.sub2" &&
+	# Create new commit in origin/super
+	add_submodule_commits &&
+	add_superproject_commits &&
+
+	# Create new commit in origin/super-sub2-only
+	git checkout super-sub2-only &&
+	(
+		cd submodule2 &&
+		test_commit --no-tag foo
+	) &&
+	git add submodule2 &&
+	git commit -m "new submodule2" &&
+
+	git checkout super &&
+	(
+		cd downstream &&
+		git fetch --recurse-submodules >../actual.out 2>../actual.err
+	) &&
+	test_must_be_empty actual.out &&
+	sub2_head=$(git -C submodule2 rev-parse --short HEAD) &&
+	super_head=$(git rev-parse --short super) &&
+	super_sub2_only_head=$(git rev-parse --short super-sub2-only) &&
+	write_expected_sub2 $sub2_head $super_sub2_only_head &&
+
+	# write_expected_super cannot handle >1 branch. Since this is a
+	# one-off, construct expect.err.super manually.
+	cat >"$pwd/expect.err.super" <<-EOF &&
+	From $pwd/.
+	   OLD_HEAD..$super_head  super           -> origin/super
+	   OLD_HEAD..$super_sub2_only_head  super-sub2-only -> origin/super-sub2-only
+	EOF
+	verify_fetch_result actual.err
 '
 
 test_expect_success "'--recurse-submodules=on-demand' stops when no new submodule commits are found in the superproject (and ignores config)" '
-	add_upstream_commit &&
-	head1=$(git rev-parse --short HEAD) &&
+	add_submodule_commits &&
 	echo a >> file &&
 	git add file &&
 	git commit -m "new file" &&
-	head2=$(git rev-parse --short HEAD) &&
-	echo "From $pwd/." > expect.err.file &&
-	echo "   $head1..$head2  master     -> origin/master" >> expect.err.file &&
+	new_head=$(git rev-parse --short HEAD) &&
+	write_expected_super $new_head &&
+	rm expect.err.sub &&
+	rm expect.err.deep &&
 	(
 		cd downstream &&
 		git fetch --recurse-submodules=on-demand >../actual.out 2>../actual.err
 	) &&
 	test_must_be_empty actual.out &&
-	test_i18ncmp expect.err.file actual.err
+	verify_fetch_result actual.err
 '
 
 test_expect_success "'fetch.recurseSubmodules=on-demand' overrides global config" '
@@ -411,15 +613,13 @@ test_expect_success "'fetch.recurseSubmodules=on-demand' overrides global config
 		cd downstream &&
 		git fetch --recurse-submodules
 	) &&
-	add_upstream_commit &&
+	add_submodule_commits &&
 	git config --global fetch.recurseSubmodules false &&
-	head1=$(git rev-parse --short HEAD) &&
 	git add submodule &&
 	git commit -m "new submodule" &&
-	head2=$(git rev-parse --short HEAD) &&
-	echo "From $pwd/." > expect.err.2 &&
-	echo "   $head1..$head2  master     -> origin/master" >>expect.err.2 &&
-	head -3 expect.err >> expect.err.2 &&
+	new_head=$(git rev-parse --short HEAD) &&
+	write_expected_super $new_head &&
+	rm expect.err.deep &&
 	(
 		cd downstream &&
 		git config fetch.recurseSubmodules on-demand &&
@@ -431,7 +631,7 @@ test_expect_success "'fetch.recurseSubmodules=on-demand' overrides global config
 		git config --unset fetch.recurseSubmodules
 	) &&
 	test_must_be_empty actual.out &&
-	test_i18ncmp expect.err.2 actual.err
+	verify_fetch_result actual.err
 '
 
 test_expect_success "'submodule.<sub>.fetchRecurseSubmodules=on-demand' overrides fetch.recurseSubmodules" '
@@ -439,15 +639,13 @@ test_expect_success "'submodule.<sub>.fetchRecurseSubmodules=on-demand' override
 		cd downstream &&
 		git fetch --recurse-submodules
 	) &&
-	add_upstream_commit &&
+	add_submodule_commits &&
 	git config fetch.recurseSubmodules false &&
-	head1=$(git rev-parse --short HEAD) &&
 	git add submodule &&
 	git commit -m "new submodule" &&
-	head2=$(git rev-parse --short HEAD) &&
-	echo "From $pwd/." > expect.err.2 &&
-	echo "   $head1..$head2  master     -> origin/master" >>expect.err.2 &&
-	head -3 expect.err >> expect.err.2 &&
+	new_head=$(git rev-parse --short HEAD) &&
+	write_expected_super $new_head &&
+	rm expect.err.deep &&
 	(
 		cd downstream &&
 		git config submodule.submodule.fetchRecurseSubmodules on-demand &&
@@ -459,7 +657,7 @@ test_expect_success "'submodule.<sub>.fetchRecurseSubmodules=on-demand' override
 		git config --unset submodule.submodule.fetchRecurseSubmodules
 	) &&
 	test_must_be_empty actual.out &&
-	test_i18ncmp expect.err.2 actual.err
+	verify_fetch_result actual.err
 '
 
 test_expect_success "don't fetch submodule when newly recorded commits are already present" '
@@ -467,21 +665,22 @@ test_expect_success "don't fetch submodule when newly recorded commits are alrea
 		cd submodule &&
 		git checkout -q HEAD^^
 	) &&
-	head1=$(git rev-parse --short HEAD) &&
 	git add submodule &&
 	git commit -m "submodule rewound" &&
-	head2=$(git rev-parse --short HEAD) &&
-	echo "From $pwd/." > expect.err &&
-	echo "   $head1..$head2  master     -> origin/master" >> expect.err &&
+	new_head=$(git rev-parse --short HEAD) &&
+	write_expected_super $new_head &&
+	rm expect.err.sub &&
+	# This file does not exist, but rm -f for readability
+	rm -f expect.err.deep &&
 	(
 		cd downstream &&
 		git fetch >../actual.out 2>../actual.err
 	) &&
 	test_must_be_empty actual.out &&
-	test_i18ncmp expect.err actual.err &&
+	verify_fetch_result actual.err &&
 	(
 		cd submodule &&
-		git checkout -q master
+		git checkout -q sub
 	)
 '
 
@@ -490,15 +689,13 @@ test_expect_success "'fetch.recurseSubmodules=on-demand' works also without .git
 		cd downstream &&
 		git fetch --recurse-submodules
 	) &&
-	add_upstream_commit &&
-	head1=$(git rev-parse --short HEAD) &&
+	add_submodule_commits &&
 	git add submodule &&
 	git rm .gitmodules &&
 	git commit -m "new submodule without .gitmodules" &&
-	head2=$(git rev-parse --short HEAD) &&
-	echo "From $pwd/." >expect.err.2 &&
-	echo "   $head1..$head2  master     -> origin/master" >>expect.err.2 &&
-	head -3 expect.err >>expect.err.2 &&
+	new_head=$(git rev-parse --short HEAD) &&
+	write_expected_super $new_head &&
+	rm expect.err.deep &&
 	(
 		cd downstream &&
 		rm .gitmodules &&
@@ -514,7 +711,7 @@ test_expect_success "'fetch.recurseSubmodules=on-demand' works also without .git
 		git reset --hard
 	) &&
 	test_must_be_empty actual.out &&
-	test_i18ncmp expect.err.2 actual.err &&
+	verify_fetch_result actual.err &&
 	git checkout HEAD^ -- .gitmodules &&
 	git add .gitmodules &&
 	git commit -m "new submodule restored .gitmodules"
@@ -522,17 +719,30 @@ test_expect_success "'fetch.recurseSubmodules=on-demand' works also without .git
 
 test_expect_success 'fetching submodules respects parallel settings' '
 	git config fetch.recurseSubmodules true &&
+	test_when_finished "rm -f downstream/trace.out" &&
 	(
 		cd downstream &&
 		GIT_TRACE=$(pwd)/trace.out git fetch &&
 		grep "1 tasks" trace.out &&
+		>trace.out &&
+
 		GIT_TRACE=$(pwd)/trace.out git fetch --jobs 7 &&
 		grep "7 tasks" trace.out &&
+		>trace.out &&
+
 		git config submodule.fetchJobs 8 &&
 		GIT_TRACE=$(pwd)/trace.out git fetch &&
 		grep "8 tasks" trace.out &&
+		>trace.out &&
+
 		GIT_TRACE=$(pwd)/trace.out git fetch --jobs 9 &&
-		grep "9 tasks" trace.out
+		grep "9 tasks" trace.out &&
+		>trace.out &&
+
+		GIT_TRACE=$(pwd)/trace.out git -c submodule.fetchJobs=0 fetch &&
+		grep "preparing to run up to [0-9]* tasks" trace.out &&
+		! grep "up to 0 tasks" trace.out &&
+		>trace.out
 	)
 '
 
@@ -561,7 +771,7 @@ test_expect_success 'fetching submodule into a broken repository' '
 	git -C dst fetch --recurse-submodules &&
 
 	# Break the receiving submodule
-	rm -f dst/sub/.git/HEAD &&
+	rm -r dst/sub/.git/objects &&
 
 	# NOTE: without the fix the following tests will recurse forever!
 	# They should terminate with an error.
@@ -663,9 +873,9 @@ test_expect_success 'fetch new submodule commits on-demand without .gitmodules e
 	git config -f .gitmodules --remove-section submodule.sub1 &&
 	git add .gitmodules &&
 	git commit -m "delete gitmodules file" &&
-	git checkout -B master &&
+	git checkout -B super &&
 	git -C downstream fetch &&
-	git -C downstream checkout origin/master &&
+	git -C downstream checkout origin/super &&
 
 	C=$(git -C submodule commit-tree -m "yet another change outside refs/heads" HEAD^{tree}) &&
 	git -C submodule update-ref refs/changes/7 $C &&
@@ -719,4 +929,268 @@ test_expect_success 'fetch new submodule commit intermittently referenced by sup
 	)
 '
 
+add_commit_push () {
+	dir="$1" &&
+	msg="$2" &&
+	shift 2 &&
+	git -C "$dir" add "$@" &&
+	git -C "$dir" commit -a -m "$msg" &&
+	git -C "$dir" push
+}
+
+compare_refs_in_dir () {
+	fail= &&
+	if test "x$1" = 'x!'
+	then
+		fail='!' &&
+		shift
+	fi &&
+	git -C "$1" rev-parse --verify "$2" >expect &&
+	git -C "$3" rev-parse --verify "$4" >actual &&
+	eval $fail test_cmp expect actual
+}
+
+
+test_expect_success 'setup nested submodule fetch test' '
+	# does not depend on any previous test setups
+
+	for repo in outer middle inner
+	do
+		git init --bare $repo &&
+		git clone $repo ${repo}_content &&
+		echo "$repo" >"${repo}_content/file" &&
+		add_commit_push ${repo}_content "initial" file ||
+		return 1
+	done &&
+
+	git clone outer A &&
+	git -C A submodule add "$pwd/middle" &&
+	git -C A/middle/ submodule add "$pwd/inner" &&
+	add_commit_push A/middle/ "adding inner sub" .gitmodules inner &&
+	add_commit_push A/ "adding middle sub" .gitmodules middle &&
+
+	git clone outer B &&
+	git -C B/ submodule update --init middle &&
+
+	compare_refs_in_dir A HEAD B HEAD &&
+	compare_refs_in_dir A/middle HEAD B/middle HEAD &&
+	test_path_is_file B/file &&
+	test_path_is_file B/middle/file &&
+	test_path_is_missing B/middle/inner/file &&
+
+	echo "change on inner repo of A" >"A/middle/inner/file" &&
+	add_commit_push A/middle/inner "change on inner" file &&
+	add_commit_push A/middle "change on inner" inner &&
+	add_commit_push A "change on inner" middle
+'
+
+test_expect_success 'fetching a superproject containing an uninitialized sub/sub project' '
+	# depends on previous test for setup
+
+	git -C B/ fetch &&
+	compare_refs_in_dir A origin/HEAD B origin/HEAD
+'
+
+fetch_with_recursion_abort () {
+	# In a regression the following git call will run into infinite recursion.
+	# To handle that, we connect the sed command to the git call by a pipe
+	# so that sed can kill the infinite recursion when detected.
+	# The recursion creates git output like:
+	# Fetching submodule sub
+	# Fetching submodule sub/sub              <-- [1]
+	# Fetching submodule sub/sub/sub
+	# ...
+	# [1] sed will stop reading and cause git to eventually stop and die
+
+	git -C "$1" fetch --recurse-submodules 2>&1 |
+		sed "/Fetching submodule $2[^$]/q" >out &&
+	! grep "Fetching submodule $2[^$]" out
+}
+
+test_expect_success 'setup recursive fetch with uninit submodule' '
+	# does not depend on any previous test setups
+
+	test_create_repo super &&
+	test_commit -C super initial &&
+	test_create_repo sub &&
+	test_commit -C sub initial &&
+	git -C sub rev-parse HEAD >expect &&
+
+	git -C super submodule add ../sub &&
+	git -C super commit -m "add sub" &&
+
+	git clone super superclone &&
+	git -C superclone submodule status >out &&
+	sed -e "s/^-//" -e "s/ sub.*$//" out >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'recursive fetch with uninit submodule' '
+	# depends on previous test for setup
+
+	fetch_with_recursion_abort superclone sub &&
+	git -C superclone submodule status >out &&
+	sed -e "s/^-//" -e "s/ sub$//" out >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'recursive fetch after deinit a submodule' '
+	# depends on previous test for setup
+
+	git -C superclone submodule update --init sub &&
+	git -C superclone submodule deinit -f sub &&
+
+	fetch_with_recursion_abort superclone sub &&
+	git -C superclone submodule status >out &&
+	sed -e "s/^-//" -e "s/ sub$//" out >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'setup repo with upstreams that share a submodule name' '
+	mkdir same-name-1 &&
+	(
+		cd same-name-1 &&
+		git init -b main &&
+		test_commit --no-tag a
+	) &&
+	git clone same-name-1 same-name-2 &&
+	# same-name-1 and same-name-2 both add a submodule with the
+	# name "submodule"
+	(
+		cd same-name-1 &&
+		mkdir submodule &&
+		git -C submodule init -b main &&
+		test_commit -C submodule --no-tag a1 &&
+		git submodule add "$pwd/same-name-1/submodule" &&
+		git add submodule &&
+		git commit -m "super-a1"
+	) &&
+	(
+		cd same-name-2 &&
+		mkdir submodule &&
+		git -C submodule init -b main &&
+		test_commit -C submodule --no-tag a2 &&
+		git submodule add "$pwd/same-name-2/submodule" &&
+		git add submodule &&
+		git commit -m "super-a2"
+	) &&
+	git clone same-name-1 -o same-name-1 same-name-downstream &&
+	(
+		cd same-name-downstream &&
+		git remote add same-name-2 ../same-name-2 &&
+		git fetch --all &&
+		# init downstream with same-name-1
+		git submodule update --init
+	)
+'
+
+test_expect_success 'fetch --recurse-submodules updates name-conflicted, populated submodule' '
+	test_when_finished "git -C same-name-downstream checkout main" &&
+	(
+		cd same-name-1 &&
+		test_commit -C submodule --no-tag b1 &&
+		git add submodule &&
+		git commit -m "super-b1"
+	) &&
+	(
+		cd same-name-2 &&
+		test_commit -C submodule --no-tag b2 &&
+		git add submodule &&
+		git commit -m "super-b2"
+	) &&
+	(
+		cd same-name-downstream &&
+		# even though the .gitmodules is correct, we cannot
+		# fetch from same-name-2
+		git checkout same-name-2/main &&
+		git fetch --recurse-submodules same-name-1 &&
+		test_must_fail git fetch --recurse-submodules same-name-2
+	) &&
+	super_head1=$(git -C same-name-1 rev-parse HEAD) &&
+	git -C same-name-downstream cat-file -e $super_head1 &&
+
+	super_head2=$(git -C same-name-2 rev-parse HEAD) &&
+	git -C same-name-downstream cat-file -e $super_head2 &&
+
+	sub_head1=$(git -C same-name-1/submodule rev-parse HEAD) &&
+	git -C same-name-downstream/submodule cat-file -e $sub_head1 &&
+
+	sub_head2=$(git -C same-name-2/submodule rev-parse HEAD) &&
+	test_must_fail git -C same-name-downstream/submodule cat-file -e $sub_head2
+'
+
+test_expect_success 'fetch --recurse-submodules updates name-conflicted, unpopulated submodule' '
+	(
+		cd same-name-1 &&
+		test_commit -C submodule --no-tag c1 &&
+		git add submodule &&
+		git commit -m "super-c1"
+	) &&
+	(
+		cd same-name-2 &&
+		test_commit -C submodule --no-tag c2 &&
+		git add submodule &&
+		git commit -m "super-c2"
+	) &&
+	(
+		cd same-name-downstream &&
+		git checkout main &&
+		git rm .gitmodules &&
+		git rm submodule &&
+		git commit -m "no submodules" &&
+		git fetch --recurse-submodules same-name-1
+	) &&
+	head1=$(git -C same-name-1/submodule rev-parse HEAD) &&
+	head2=$(git -C same-name-2/submodule rev-parse HEAD) &&
+	(
+		cd same-name-downstream/.git/modules/submodule &&
+		# The submodule has core.worktree pointing to the "git
+		# rm"-ed directory, overwrite the invalid value. See
+		# comment in get_fetch_task_from_changed() for more
+		# information.
+		git --work-tree=. cat-file -e $head1 &&
+		test_must_fail git --work-tree=. cat-file -e $head2
+	)
+'
+
+test_expect_success 'fetch --all with --recurse-submodules' '
+	test_when_finished "rm -fr src_clone" &&
+	git clone --recurse-submodules src src_clone &&
+	(
+		cd src_clone &&
+		git config submodule.recurse true &&
+		git config fetch.parallel 0 &&
+		git fetch --all 2>../fetch-log
+	) &&
+	grep "^Fetching submodule sub$" fetch-log >fetch-subs &&
+	test_line_count = 1 fetch-subs
+'
+
+test_expect_success 'fetch --all with --recurse-submodules with multiple' '
+	test_when_finished "rm -fr src_clone" &&
+	git clone --recurse-submodules src src_clone &&
+	(
+		cd src_clone &&
+		git remote add secondary ../src &&
+		git config submodule.recurse true &&
+		git config fetch.parallel 0 &&
+		git fetch --all 2>../fetch-log
+	) &&
+	grep "Fetching submodule sub" fetch-log >fetch-subs &&
+	test_line_count = 2 fetch-subs
+'
+
+test_expect_success "fetch --all with --no-recurse-submodules only fetches superproject" '
+	test_when_finished "rm -rf src_clone" &&
+
+	git clone --recurse-submodules src src_clone &&
+	(
+		cd src_clone &&
+		git remote add secondary ../src &&
+		git config submodule.recurse true &&
+		git fetch --all --no-recurse-submodules 2>../fetch-log
+	) &&
+	! grep "Fetching submodule" fetch-log
+'
+
 test_done
diff --git a/t/t5527-fetch-odd-refs.sh b/t/t5527-fetch-odd-refs.sh
index 3b0cb98..98ece27 100755
--- a/t/t5527-fetch-odd-refs.sh
+++ b/t/t5527-fetch-odd-refs.sh
@@ -1,17 +1,21 @@
 #!/bin/sh
 
 test_description='test fetching of oddly-named refs'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # afterwards we will have:
 #  HEAD - two
-#  refs/for/refs/heads/master - one
-#  refs/heads/master - three
+#  refs/for/refs/heads/main - one
+#  refs/heads/main - three
 test_expect_success 'setup repo with odd suffix ref' '
 	echo content >file &&
 	git add . &&
 	git commit -m one &&
-	git update-ref refs/for/refs/heads/master HEAD &&
+	git update-ref refs/for/refs/heads/main HEAD &&
 	echo content >>file &&
 	git commit -a -m two &&
 	echo content >>file &&
@@ -22,7 +26,7 @@ test_expect_success 'setup repo with odd suffix ref' '
 test_expect_success 'suffix ref is ignored during fetch' '
 	git clone --bare file://"$PWD" suffix &&
 	echo three >expect &&
-	git --git-dir=suffix log -1 --format=%s refs/heads/master >actual &&
+	git --git-dir=suffix log -1 --format=%s refs/heads/main >actual &&
 	test_cmp expect actual
 '
 
@@ -33,7 +37,7 @@ test_expect_success 'try to create repo with absurdly long refname' '
 	(
 		cd long &&
 		test_commit long &&
-		test_commit master
+		test_commit main
 	) &&
 	if git -C long update-ref refs/heads/$ref1440 long; then
 		test_set_prereq LONG_REF
@@ -46,7 +50,7 @@ test_expect_success LONG_REF 'fetch handles extremely long refname' '
 	git fetch long refs/heads/*:refs/remotes/long/* &&
 	cat >expect <<-\EOF &&
 	long
-	master
+	main
 	EOF
 	git for-each-ref --format="%(subject)" refs/remotes/long >actual &&
 	test_cmp expect actual
@@ -55,7 +59,7 @@ test_expect_success LONG_REF 'fetch handles extremely long refname' '
 test_expect_success LONG_REF 'push handles extremely long refname' '
 	git push long :refs/heads/$ref1440 &&
 	git -C long for-each-ref --format="%(subject)" refs/heads >actual &&
-	echo master >expect &&
+	echo main >expect &&
 	test_cmp expect actual
 '
 
diff --git a/t/t5528-push-default.sh b/t/t5528-push-default.sh
index f0a287d..14f7ece 100755
--- a/t/t5528-push-default.sh
+++ b/t/t5528-push-default.sh
@@ -1,6 +1,9 @@
 #!/bin/sh
 
 test_description='check various push.default settings'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 test_expect_success 'setup bare remotes' '
@@ -41,7 +44,7 @@ test_push_failure () {
 
 # $1 = success or failure
 # $2 = push.default value
-# $3 = branch to check for actual output (master or foo)
+# $3 = branch to check for actual output (main or foo)
 # $4 = [optional] switch to triangular workflow
 test_pushdefault_workflow () {
 	workflow=central
@@ -51,8 +54,8 @@ test_pushdefault_workflow () {
 		pushdefault=parent2
 	fi
 	test_expect_success "push.default = $2 $1 in $workflow workflows" "
-		test_config branch.master.remote parent1 &&
-		test_config branch.master.merge refs/heads/foo &&
+		test_config branch.main.remote parent1 &&
+		test_config branch.main.merge refs/heads/foo &&
 		test_config remote.pushdefault $pushdefault &&
 		test_commit commit-for-$2${4+-triangular} &&
 		test_push_$1 $2 $3 ${4+repo2}
@@ -60,48 +63,123 @@ test_pushdefault_workflow () {
 }
 
 test_expect_success '"upstream" pushes to configured upstream' '
-	git checkout master &&
-	test_config branch.master.remote parent1 &&
-	test_config branch.master.merge refs/heads/foo &&
+	git checkout main &&
+	test_config branch.main.remote parent1 &&
+	test_config branch.main.merge refs/heads/foo &&
 	test_commit two &&
 	test_push_success upstream foo
 '
 
 test_expect_success '"upstream" does not push on unconfigured remote' '
-	git checkout master &&
-	test_unconfig branch.master.remote &&
+	git checkout main &&
+	test_unconfig branch.main.remote &&
 	test_commit three &&
 	test_push_failure upstream
 '
 
 test_expect_success '"upstream" does not push on unconfigured branch' '
-	git checkout master &&
-	test_config branch.master.remote parent1 &&
-	test_unconfig branch.master.merge &&
+	git checkout main &&
+	test_config branch.main.remote parent1 &&
+	test_unconfig branch.main.merge &&
 	test_commit four &&
 	test_push_failure upstream
 '
 
 test_expect_success '"upstream" does not push when remotes do not match' '
-	git checkout master &&
-	test_config branch.master.remote parent1 &&
-	test_config branch.master.merge refs/heads/foo &&
+	git checkout main &&
+	test_config branch.main.remote parent1 &&
+	test_config branch.main.merge refs/heads/foo &&
 	test_config push.default upstream &&
 	test_commit five &&
 	test_must_fail git push parent2
 '
 
-test_expect_success 'push from/to new branch with upstream, matching and simple' '
+test_expect_success '"current" does not push when multiple remotes and none origin' '
+	git checkout main &&
+	test_config push.default current &&
+	test_commit current-multi &&
+	test_must_fail git push
+'
+
+test_expect_success '"current" pushes when remote explicitly specified' '
+	git checkout main &&
+	test_config push.default current &&
+	test_commit current-specified &&
+	git push parent1
+'
+
+test_expect_success '"current" pushes to origin when no remote specified among multiple' '
+	git checkout main &&
+	test_config remote.origin.url repo1 &&
+	test_config remote.origin.fetch "+refs/heads/*:refs/remotes/origin/*" &&
+	test_commit current-origin &&
+	test_push_success current main
+'
+
+test_expect_success '"current" pushes to single remote even when not specified' '
+	git checkout main &&
+	test_when_finished git remote add parent1 repo1 &&
+	git remote remove parent1 &&
+	test_commit current-implied &&
+	test_push_success current main repo2
+'
+
+test_expect_success 'push from/to new branch with non-defaulted remote fails with upstream, matching, current and simple ' '
 	git checkout -b new-branch &&
 	test_push_failure simple &&
 	test_push_failure matching &&
+	test_push_failure upstream &&
+	test_push_failure current
+'
+
+test_expect_success 'push from/to new branch fails with upstream and simple ' '
+	git checkout -b new-branch-1 &&
+	test_config branch.new-branch-1.remote parent1 &&
+	test_push_failure simple &&
 	test_push_failure upstream
 '
 
+# The behavior here is surprising but not entirely wrong:
+#  - the current branch is used to determine the target remote
+#  - the "matching" push default pushes matching branches, *ignoring* the
+#       current new branch as it does not have upstream tracking
+#  - the default push succeeds
+#
+# A previous test expected this to fail, but for the wrong reasons:
+# it expected a fail becaause the branch is new and cannot be pushed, but
+# in fact it was failing because of an ambiguous remote
+#
+test_expect_failure 'push from/to new branch fails with matching ' '
+	git checkout -b new-branch-2 &&
+	test_config branch.new-branch-2.remote parent1 &&
+	test_push_failure matching
+'
+
+test_expect_success 'push from/to branch with tracking fails with nothing ' '
+	git checkout -b tracked-branch &&
+	test_config branch.tracked-branch.remote parent1 &&
+	test_config branch.tracked-branch.merge refs/heads/tracked-branch &&
+	test_push_failure nothing
+'
+
+test_expect_success 'push from/to new branch succeeds with upstream if push.autoSetupRemote' '
+	git checkout -b new-branch-a &&
+	test_config push.autoSetupRemote true &&
+	test_config branch.new-branch-a.remote parent1 &&
+	test_push_success upstream new-branch-a
+'
+
+test_expect_success 'push from/to new branch succeeds with simple if push.autoSetupRemote' '
+	git checkout -b new-branch-c &&
+	test_config push.autoSetupRemote true &&
+	test_config branch.new-branch-c.remote parent1 &&
+	test_push_success simple new-branch-c
+'
+
 test_expect_success '"matching" fails if none match' '
 	git init --bare empty &&
 	test_must_fail git push empty : 2>actual &&
-	test_i18ngrep "Perhaps you should specify a branch" actual
+	test_grep "Perhaps you should specify a branch" actual
 '
 
 test_expect_success 'push ambiguously named branch with upstream, matching and simple' '
@@ -121,99 +199,99 @@ test_expect_success 'push from/to new branch with current creates remote branch'
 '
 
 test_expect_success 'push to existing branch, with no upstream configured' '
-	test_config branch.master.remote repo1 &&
-	git checkout master &&
+	test_config branch.main.remote repo1 &&
+	git checkout main &&
 	test_push_failure simple &&
 	test_push_failure upstream
 '
 
 test_expect_success 'push to existing branch, upstream configured with same name' '
-	test_config branch.master.remote repo1 &&
-	test_config branch.master.merge refs/heads/master &&
-	git checkout master &&
+	test_config branch.main.remote repo1 &&
+	test_config branch.main.merge refs/heads/main &&
+	git checkout main &&
 	test_commit six &&
-	test_push_success upstream master &&
+	test_push_success upstream main &&
 	test_commit seven &&
-	test_push_success simple master
+	test_push_success simple main
 '
 
 test_expect_success 'push to existing branch, upstream configured with different name' '
-	test_config branch.master.remote repo1 &&
-	test_config branch.master.merge refs/heads/other-name &&
-	git checkout master &&
+	test_config branch.main.remote repo1 &&
+	test_config branch.main.merge refs/heads/other-name &&
+	git checkout main &&
 	test_commit eight &&
 	test_push_success upstream other-name &&
 	test_commit nine &&
 	test_push_failure simple &&
 	git --git-dir=repo1 log -1 --format="%h %s" "other-name" >expect-other-name &&
-	test_push_success current master &&
+	test_push_success current main &&
 	git --git-dir=repo1 log -1 --format="%h %s" "other-name" >actual-other-name &&
 	test_cmp expect-other-name actual-other-name
 '
 
-# We are on 'master', which integrates with 'foo' from parent1
+# We are on 'main', which integrates with 'foo' from parent1
 # remote (set in test_pushdefault_workflow helper).  Push to
 # parent1 in centralized, and push to parent2 in triangular workflow.
-# The parent1 repository has 'master' and 'foo' branches, while
-# the parent2 repository has only 'master' branch.
+# The parent1 repository has 'main' and 'foo' branches, while
+# the parent2 repository has only 'main' branch.
 #
 # test_pushdefault_workflow() arguments:
 # $1 = success or failure
 # $2 = push.default value
-# $3 = branch to check for actual output (master or foo)
+# $3 = branch to check for actual output (main or foo)
 # $4 = [optional] switch to triangular workflow
 
-# update parent1's master (which is not our upstream)
-test_pushdefault_workflow success current master
+# update parent1's main (which is not our upstream)
+test_pushdefault_workflow success current main
 
 # update parent1's foo (which is our upstream)
 test_pushdefault_workflow success upstream foo
 
 # upstream is foo which is not the name of the current branch
-test_pushdefault_workflow failure simple master
+test_pushdefault_workflow failure simple main
 
-# master and foo are updated
-test_pushdefault_workflow success matching master
+# main and foo are updated
+test_pushdefault_workflow success matching main
 
-# master is updated
-test_pushdefault_workflow success current master triangular
+# main is updated
+test_pushdefault_workflow success current main triangular
 
 # upstream mode cannot be used in triangular
 test_pushdefault_workflow failure upstream foo triangular
 
 # in triangular, 'simple' works as 'current' and update the branch
 # with the same name.
-test_pushdefault_workflow success simple master triangular
+test_pushdefault_workflow success simple main triangular
 
-# master is updated (parent2 does not have foo)
-test_pushdefault_workflow success matching master triangular
+# main is updated (parent2 does not have foo)
+test_pushdefault_workflow success matching main triangular
 
 # default tests, when no push-default is specified. This
 # should behave the same as "simple" in non-triangular
 # settings, and as "current" otherwise.
 
 test_expect_success 'default behavior allows "simple" push' '
-	test_config branch.master.remote parent1 &&
-	test_config branch.master.merge refs/heads/master &&
+	test_config branch.main.remote parent1 &&
+	test_config branch.main.merge refs/heads/main &&
 	test_config remote.pushdefault parent1 &&
-	test_commit default-master-master &&
-	test_push_success "" master
+	test_commit default-main-main &&
+	test_push_success "" main
 '
 
 test_expect_success 'default behavior rejects non-simple push' '
-	test_config branch.master.remote parent1 &&
-	test_config branch.master.merge refs/heads/foo &&
+	test_config branch.main.remote parent1 &&
+	test_config branch.main.merge refs/heads/foo &&
 	test_config remote.pushdefault parent1 &&
-	test_commit default-master-foo &&
+	test_commit default-main-foo &&
 	test_push_failure ""
 '
 
 test_expect_success 'default triangular behavior acts like "current"' '
-	test_config branch.master.remote parent1 &&
-	test_config branch.master.merge refs/heads/foo &&
+	test_config branch.main.remote parent1 &&
+	test_config branch.main.merge refs/heads/foo &&
 	test_config remote.pushdefault parent2 &&
 	test_commit default-triangular &&
-	test_push_success "" master repo2
+	test_push_success "" main repo2
 '
 
 test_done
diff --git a/t/t5529-push-errors.sh b/t/t5529-push-errors.sh
index 9871307..0247137 100755
--- a/t/t5529-push-errors.sh
+++ b/t/t5529-push-errors.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='detect some push errors early (before contacting remote)'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup commits' '
@@ -32,7 +34,7 @@ test_expect_success 'detect missing branches early' '
 test_expect_success 'detect missing sha1 expressions early' '
 	echo no >rp-ran &&
 	echo no >expect &&
-	test_must_fail git push origin master~2:master &&
+	test_must_fail git push origin main~2:main &&
 	test_cmp expect rp-ran
 '
 
diff --git a/t/t5530-upload-pack-error.sh b/t/t5530-upload-pack-error.sh
index 205a263..7172780 100755
--- a/t/t5530-upload-pack-error.sh
+++ b/t/t5530-upload-pack-error.sh
@@ -2,6 +2,7 @@
 
 test_description='errors in upload-pack'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 D=$(pwd)
@@ -35,8 +36,8 @@ test_expect_success 'upload-pack fails due to error in pack-objects packing' '
 	printf "%04xwant %s\n00000009done\n0000" \
 		$(($hexsz + 10)) $head >input &&
 	test_must_fail git upload-pack . <input >/dev/null 2>output.err &&
-	test_i18ngrep "unable to read" output.err &&
-	test_i18ngrep "pack-objects died" output.err
+	test_grep "unable to read" output.err &&
+	test_grep "pack-objects died" output.err
 '
 
 test_expect_success 'corrupt repo differently' '
@@ -88,6 +89,23 @@ test_expect_success 'upload-pack fails due to error in pack-objects enumeration'
 	grep "pack-objects died" output.err
 '
 
+test_expect_success 'upload-pack tolerates EOF just after stateless client wants' '
+	test_commit initial &&
+	head=$(git rev-parse HEAD) &&
+
+	{
+		packetize "want $head" &&
+		packetize "shallow $head" &&
+		packetize "deepen 1" &&
+		printf "0000"
+	} >request &&
+
+	printf "0000" >expect &&
+
+	git upload-pack --stateless-rpc . <request >actual &&
+	test_cmp expect actual
+'
+
 test_expect_success 'create empty repository' '
 
 	mkdir foo &&
@@ -98,7 +116,7 @@ test_expect_success 'create empty repository' '
 
 test_expect_success 'fetch fails' '
 
-	test_must_fail git fetch .. master
+	test_must_fail git fetch .. main
 
 '
 
diff --git a/t/t5531-deep-submodule-push.sh b/t/t5531-deep-submodule-push.sh
index 4ad059e..f3fff55 100755
--- a/t/t5531-deep-submodule-push.sh
+++ b/t/t5531-deep-submodule-push.sh
@@ -2,6 +2,12 @@
 
 test_description='test push with submodules'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+GIT_TEST_FATAL_REGISTER_SUBMODULE_ODB=1
+export GIT_TEST_FATAL_REGISTER_SUBMODULE_ODB
+
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -30,7 +36,7 @@ test_expect_success setup '
 test_expect_success 'push works with recorded gitlink' '
 	(
 		cd work &&
-		git push ../pub.git master
+		git push ../pub.git main
 	)
 '
 
@@ -45,7 +51,7 @@ test_expect_success 'push if submodule has no remote' '
 		cd work &&
 		git add gar/bage &&
 		git commit -m "Second commit for gar/bage" &&
-		git push --recurse-submodules=check ../pub.git master
+		git push --recurse-submodules=check ../pub.git main
 	)
 '
 
@@ -66,21 +72,21 @@ test_expect_success 'push fails if submodule commit not on remote' '
 		git commit -m "Third commit for gar/bage" &&
 		# the push should fail with --recurse-submodules=check
 		# on the command line...
-		test_must_fail git push --recurse-submodules=check ../pub.git master &&
+		test_must_fail git push --recurse-submodules=check ../pub.git main &&
 
 		# ...or if specified in the configuration..
-		test_must_fail git -c push.recurseSubmodules=check push ../pub.git master
+		test_must_fail git -c push.recurseSubmodules=check push ../pub.git main
 	)
 '
 
 test_expect_success 'push succeeds after commit was pushed to remote' '
 	(
 		cd work/gar/bage &&
-		git push origin master
+		git push origin main
 	) &&
 	(
 		cd work &&
-		git push --recurse-submodules=check ../pub.git master
+		git push --recurse-submodules=check ../pub.git main
 	)
 '
 
@@ -95,13 +101,13 @@ test_expect_success 'push succeeds if submodule commit not on remote but using o
 		cd work &&
 		git add gar/bage &&
 		git commit -m "Recurse on-demand on command line for gar/bage" &&
-		git push --recurse-submodules=on-demand ../pub.git master &&
+		git push --recurse-submodules=on-demand ../pub.git main &&
 		# Check that the supermodule commit got there
 		git fetch ../pub.git &&
-		git diff --quiet FETCH_HEAD master &&
+		git diff --quiet FETCH_HEAD main &&
 		# Check that the submodule commit got there too
 		cd gar/bage &&
-		git diff --quiet origin/master master
+		git diff --quiet origin/main main
 	)
 '
 
@@ -116,13 +122,13 @@ test_expect_success 'push succeeds if submodule commit not on remote but using o
 		cd work &&
 		git add gar/bage &&
 		git commit -m "Recurse on-demand from config for gar/bage" &&
-		git -c push.recurseSubmodules=on-demand push ../pub.git master &&
+		git -c push.recurseSubmodules=on-demand push ../pub.git main &&
 		# Check that the supermodule commit got there
 		git fetch ../pub.git &&
-		git diff --quiet FETCH_HEAD master &&
+		git diff --quiet FETCH_HEAD main &&
 		# Check that the submodule commit got there too
 		cd gar/bage &&
-		git diff --quiet origin/master master
+		git diff --quiet origin/main main
 	)
 '
 
@@ -137,13 +143,13 @@ test_expect_success 'push succeeds if submodule commit not on remote but using a
 		cd work &&
 		git add gar/bage &&
 		git commit -m "Recurse submodule.recurse from config for gar/bage" &&
-		git -c submodule.recurse push ../pub.git master &&
+		git -c submodule.recurse push ../pub.git main &&
 		# Check that the supermodule commit got there
 		git fetch ../pub.git &&
-		git diff --quiet FETCH_HEAD master &&
+		git diff --quiet FETCH_HEAD main &&
 		# Check that the submodule commit got there too
 		cd gar/bage &&
-		git diff --quiet origin/master master
+		git diff --quiet origin/main main
 	)
 '
 
@@ -161,34 +167,34 @@ test_expect_success 'push recurse-submodules on command line overrides config' '
 
 		# Ensure that we can override on-demand in the config
 		# to just check submodules
-		test_must_fail git -c push.recurseSubmodules=on-demand push --recurse-submodules=check ../pub.git master &&
+		test_must_fail git -c push.recurseSubmodules=on-demand push --recurse-submodules=check ../pub.git main &&
 		# Check that the supermodule commit did not get there
 		git fetch ../pub.git &&
-		git diff --quiet FETCH_HEAD master^ &&
+		git diff --quiet FETCH_HEAD main^ &&
 		# Check that the submodule commit did not get there
-		(cd gar/bage && git diff --quiet origin/master master^) &&
+		(cd gar/bage && git diff --quiet origin/main main^) &&
 
 		# Ensure that we can override check in the config to
 		# disable submodule recursion entirely
-		(cd gar/bage && git diff --quiet origin/master master^) &&
-		git -c push.recurseSubmodules=on-demand push --recurse-submodules=no ../pub.git master &&
+		(cd gar/bage && git diff --quiet origin/main main^) &&
+		git -c push.recurseSubmodules=on-demand push --recurse-submodules=no ../pub.git main &&
 		git fetch ../pub.git &&
-		git diff --quiet FETCH_HEAD master &&
-		(cd gar/bage && git diff --quiet origin/master master^) &&
+		git diff --quiet FETCH_HEAD main &&
+		(cd gar/bage && git diff --quiet origin/main main^) &&
 
 		# Ensure that we can override check in the config to
 		# disable submodule recursion entirely (alternative form)
-		git -c push.recurseSubmodules=on-demand push --no-recurse-submodules ../pub.git master &&
+		git -c push.recurseSubmodules=on-demand push --no-recurse-submodules ../pub.git main &&
 		git fetch ../pub.git &&
-		git diff --quiet FETCH_HEAD master &&
-		(cd gar/bage && git diff --quiet origin/master master^) &&
+		git diff --quiet FETCH_HEAD main &&
+		(cd gar/bage && git diff --quiet origin/main main^) &&
 
 		# Ensure that we can override check in the config to
 		# push the submodule too
-		git -c push.recurseSubmodules=check push --recurse-submodules=on-demand ../pub.git master &&
+		git -c push.recurseSubmodules=check push --recurse-submodules=on-demand ../pub.git main &&
 		git fetch ../pub.git &&
-		git diff --quiet FETCH_HEAD master &&
-		(cd gar/bage && git diff --quiet origin/master master)
+		git diff --quiet FETCH_HEAD main &&
+		(cd gar/bage && git diff --quiet origin/main main)
 	)
 '
 
@@ -205,31 +211,31 @@ test_expect_success 'push recurse-submodules last one wins on command line' '
 		git commit -m "Recurse on command-line overriding earlier command-line for gar/bage" &&
 
 		# should result in "check"
-		test_must_fail git push --recurse-submodules=on-demand --recurse-submodules=check ../pub.git master &&
+		test_must_fail git push --recurse-submodules=on-demand --recurse-submodules=check ../pub.git main &&
 		# Check that the supermodule commit did not get there
 		git fetch ../pub.git &&
-		git diff --quiet FETCH_HEAD master^ &&
+		git diff --quiet FETCH_HEAD main^ &&
 		# Check that the submodule commit did not get there
-		(cd gar/bage && git diff --quiet origin/master master^) &&
+		(cd gar/bage && git diff --quiet origin/main main^) &&
 
 		# should result in "no"
-		git push --recurse-submodules=on-demand --recurse-submodules=no ../pub.git master &&
+		git push --recurse-submodules=on-demand --recurse-submodules=no ../pub.git main &&
 		# Check that the supermodule commit did get there
 		git fetch ../pub.git &&
-		git diff --quiet FETCH_HEAD master &&
+		git diff --quiet FETCH_HEAD main &&
 		# Check that the submodule commit did not get there
-		(cd gar/bage && git diff --quiet origin/master master^) &&
+		(cd gar/bage && git diff --quiet origin/main main^) &&
 
 		# should result in "no"
-		git push --recurse-submodules=on-demand --no-recurse-submodules ../pub.git master &&
+		git push --recurse-submodules=on-demand --no-recurse-submodules ../pub.git main &&
 		# Check that the submodule commit did not get there
-		(cd gar/bage && git diff --quiet origin/master master^) &&
+		(cd gar/bage && git diff --quiet origin/main main^) &&
 
 		# But the options in the other order should push the submodule
-		git push --recurse-submodules=check --recurse-submodules=on-demand ../pub.git master &&
+		git push --recurse-submodules=check --recurse-submodules=on-demand ../pub.git main &&
 		# Check that the submodule commit did get there
 		git fetch ../pub.git &&
-		(cd gar/bage && git diff --quiet origin/master master)
+		(cd gar/bage && git diff --quiet origin/main main)
 	)
 '
 
@@ -244,13 +250,13 @@ test_expect_success 'push succeeds if submodule commit not on remote using on-de
 		cd work &&
 		git add gar/bage &&
 		git commit -m "Recurse on-demand on command-line overriding config for gar/bage" &&
-		git -c push.recurseSubmodules=check push --recurse-submodules=on-demand ../pub.git master &&
+		git -c push.recurseSubmodules=check push --recurse-submodules=on-demand ../pub.git main &&
 		# Check that the supermodule commit got there
 		git fetch ../pub.git &&
-		git diff --quiet FETCH_HEAD master &&
+		git diff --quiet FETCH_HEAD main &&
 		# Check that the submodule commit got there
 		cd gar/bage &&
-		git diff --quiet origin/master master
+		git diff --quiet origin/main main
 	)
 '
 
@@ -265,14 +271,14 @@ test_expect_success 'push succeeds if submodule commit disabling recursion from
 		cd work &&
 		git add gar/bage &&
 		git commit -m "Recurse disable on command-line overriding config for gar/bage" &&
-		git -c push.recurseSubmodules=check push --recurse-submodules=no ../pub.git master &&
+		git -c push.recurseSubmodules=check push --recurse-submodules=no ../pub.git main &&
 		# Check that the supermodule commit got there
 		git fetch ../pub.git &&
-		git diff --quiet FETCH_HEAD master &&
+		git diff --quiet FETCH_HEAD main &&
 		# But that the submodule commit did not
-		( cd gar/bage && git diff --quiet origin/master master^ ) &&
+		( cd gar/bage && git diff --quiet origin/main main^ ) &&
 		# Now push it to avoid confusing future tests
-		git push --recurse-submodules=on-demand ../pub.git master
+		git push --recurse-submodules=on-demand ../pub.git main
 	)
 '
 
@@ -287,14 +293,14 @@ test_expect_success 'push succeeds if submodule commit disabling recursion from
 		cd work &&
 		git add gar/bage &&
 		git commit -m "Recurse disable on command-line alternative overriding config for gar/bage" &&
-		git -c push.recurseSubmodules=check push --no-recurse-submodules ../pub.git master &&
+		git -c push.recurseSubmodules=check push --no-recurse-submodules ../pub.git main &&
 		# Check that the supermodule commit got there
 		git fetch ../pub.git &&
-		git diff --quiet FETCH_HEAD master &&
+		git diff --quiet FETCH_HEAD main &&
 		# But that the submodule commit did not
-		( cd gar/bage && git diff --quiet origin/master master^ ) &&
+		( cd gar/bage && git diff --quiet origin/main main^ ) &&
 		# Now push it to avoid confusing future tests
-		git push --recurse-submodules=on-demand ../pub.git master
+		git push --recurse-submodules=on-demand ../pub.git main
 	)
 '
 
@@ -304,8 +310,8 @@ test_expect_success 'submodule entry pointing at a tag is error' '
 	git -C work update-index --cacheinfo 160000 "$tag" gar/bage &&
 	git -C work commit -m "bad commit" &&
 	test_when_finished "git -C work reset --hard HEAD^" &&
-	test_must_fail git -C work push --recurse-submodules=on-demand ../pub.git master 2>err &&
-	test_i18ngrep "is a tag, not a commit" err
+	test_must_fail git -C work push --recurse-submodules=on-demand ../pub.git main 2>err &&
+	test_grep "is a tag, not a commit" err
 '
 
 test_expect_success 'push fails if recurse submodules option passed as yes' '
@@ -319,9 +325,9 @@ test_expect_success 'push fails if recurse submodules option passed as yes' '
 		cd work &&
 		git add gar/bage &&
 		git commit -m "Recurse push fails if recurse submodules option passed as yes for gar/bage" &&
-		test_must_fail git push --recurse-submodules=yes ../pub.git master &&
-		test_must_fail git -c push.recurseSubmodules=yes push ../pub.git master &&
-		git push --recurse-submodules=on-demand ../pub.git master
+		test_must_fail git push --recurse-submodules=yes ../pub.git main &&
+		test_must_fail git -c push.recurseSubmodules=yes push ../pub.git main &&
+		git push --recurse-submodules=on-demand ../pub.git main
 	)
 '
 
@@ -363,7 +369,7 @@ test_expect_success 'push succeeds if submodule has no remote and is on the firs
 		) &&
 		git add b &&
 		git commit -m "added submodule" &&
-		git push --recurse-submodules=check origin master
+		git push --recurse-submodules=check origin main
 	)
 '
 
@@ -372,21 +378,21 @@ test_expect_success 'push unpushed submodules when not needed' '
 		cd work &&
 		(
 			cd gar/bage &&
-			git checkout master &&
+			git checkout main &&
 			>junk5 &&
 			git add junk5 &&
 			git commit -m "Fifth junk" &&
 			git push &&
-			git rev-parse origin/master >../../../expected
+			git rev-parse origin/main >../../../expected
 		) &&
-		git checkout master &&
+		git checkout main &&
 		git add gar/bage &&
 		git commit -m "Fifth commit for gar/bage" &&
-		git push --recurse-submodules=on-demand ../pub.git master
+		git push --recurse-submodules=on-demand ../pub.git main
 	) &&
 	(
 		cd submodule.git &&
-		git rev-parse master >../actual
+		git rev-parse main >../actual
 	) &&
 	test_cmp expected actual
 '
@@ -394,7 +400,7 @@ test_expect_success 'push unpushed submodules when not needed' '
 test_expect_success 'push unpushed submodules when not needed 2' '
 	(
 		cd submodule.git &&
-		git rev-parse master >../expected
+		git rev-parse main >../expected
 	) &&
 	(
 		cd work &&
@@ -407,11 +413,11 @@ test_expect_success 'push unpushed submodules when not needed 2' '
 		>junk2 &&
 		git add junk2 &&
 		git commit -m "Second junk for work" &&
-		git push --recurse-submodules=on-demand ../pub.git master
+		git push --recurse-submodules=on-demand ../pub.git main
 	) &&
 	(
 		cd submodule.git &&
-		git rev-parse master >../actual
+		git rev-parse main >../actual
 	) &&
 	test_cmp expected actual
 '
@@ -421,20 +427,20 @@ test_expect_success 'push unpushed submodules recursively' '
 		cd work &&
 		(
 			cd gar/bage &&
-			git checkout master &&
+			git checkout main &&
 			> junk7 &&
 			git add junk7 &&
 			git commit -m "Seventh junk" &&
-			git rev-parse master >../../../expected
+			git rev-parse main >../../../expected
 		) &&
-		git checkout master &&
+		git checkout main &&
 		git add gar/bage &&
 		git commit -m "Seventh commit for gar/bage" &&
-		git push --recurse-submodules=on-demand ../pub.git master
+		git push --recurse-submodules=on-demand ../pub.git main
 	) &&
 	(
 		cd submodule.git &&
-		git rev-parse master >../actual
+		git rev-parse main >../actual
 	) &&
 	test_cmp expected actual
 '
@@ -444,68 +450,118 @@ test_expect_success 'push unpushable submodule recursively fails' '
 		cd work &&
 		(
 			cd gar/bage &&
-			git rev-parse origin/master >../../../expected &&
-			git checkout master~0 &&
+			git rev-parse origin/main >../../../expected &&
+			git checkout main~0 &&
 			> junk8 &&
 			git add junk8 &&
 			git commit -m "Eighth junk"
 		) &&
 		git add gar/bage &&
 		git commit -m "Eighth commit for gar/bage" &&
-		test_must_fail git push --recurse-submodules=on-demand ../pub.git master
+		test_must_fail git push --recurse-submodules=on-demand ../pub.git main
 	) &&
 	(
 		cd submodule.git &&
-		git rev-parse master >../actual
+		git rev-parse main >../actual
 	) &&
-	test_when_finished git -C work reset --hard master^ &&
+	test_when_finished git -C work reset --hard main^ &&
 	test_cmp expected actual
 '
 
 test_expect_success 'push --dry-run does not recursively update submodules' '
 	(
 		cd work/gar/bage &&
-		git checkout master &&
-		git rev-parse master >../../../expected_submodule &&
+		git checkout main &&
+		git rev-parse main >../../../expected_submodule &&
 		> junk9 &&
 		git add junk9 &&
 		git commit -m "Ninth junk" &&
 
 		# Go up to 'work' directory
 		cd ../.. &&
-		git checkout master &&
-		git rev-parse master >../expected_pub &&
+		git checkout main &&
+		git rev-parse main >../expected_pub &&
 		git add gar/bage &&
 		git commit -m "Ninth commit for gar/bage" &&
-		git push --dry-run --recurse-submodules=on-demand ../pub.git master
+		git push --dry-run --recurse-submodules=on-demand ../pub.git main
 	) &&
-	git -C submodule.git rev-parse master >actual_submodule &&
-	git -C pub.git rev-parse master >actual_pub &&
+	git -C submodule.git rev-parse main >actual_submodule &&
+	git -C pub.git rev-parse main >actual_pub &&
 	test_cmp expected_pub actual_pub &&
 	test_cmp expected_submodule actual_submodule
 '
 
 test_expect_success 'push --dry-run does not recursively update submodules' '
-	git -C work push --dry-run --recurse-submodules=only ../pub.git master &&
+	git -C work push --dry-run --recurse-submodules=only ../pub.git main &&
 
-	git -C submodule.git rev-parse master >actual_submodule &&
-	git -C pub.git rev-parse master >actual_pub &&
+	git -C submodule.git rev-parse main >actual_submodule &&
+	git -C pub.git rev-parse main >actual_pub &&
 	test_cmp expected_pub actual_pub &&
 	test_cmp expected_submodule actual_submodule
 '
 
 test_expect_success 'push only unpushed submodules recursively' '
-	git -C work/gar/bage rev-parse master >expected_submodule &&
-	git -C pub.git rev-parse master >expected_pub &&
+	git -C work/gar/bage rev-parse main >expected_submodule &&
+	git -C pub.git rev-parse main >expected_pub &&
 
-	git -C work push --recurse-submodules=only ../pub.git master &&
+	git -C work push --recurse-submodules=only ../pub.git main &&
 
-	git -C submodule.git rev-parse master >actual_submodule &&
-	git -C pub.git rev-parse master >actual_pub &&
+	git -C submodule.git rev-parse main >actual_submodule &&
+	git -C pub.git rev-parse main >actual_pub &&
 	test_cmp expected_submodule actual_submodule &&
 	test_cmp expected_pub actual_pub
 '
 
+setup_subsub () {
+	git init upstream &&
+	git init upstream/sub &&
+	git init upstream/sub/deepsub &&
+	test_commit -C upstream/sub/deepsub innermost &&
+	git -C upstream/sub submodule add ./deepsub deepsub &&
+	git -C upstream/sub commit -m middle &&
+	git -C upstream submodule add ./sub sub &&
+	git -C upstream commit -m outermost &&
+
+	git -c protocol.file.allow=always clone --recurse-submodules upstream downstream &&
+	git -C downstream/sub/deepsub checkout -b downstream-branch &&
+	git -C downstream/sub checkout -b downstream-branch &&
+	git -C downstream checkout -b downstream-branch
+}
+
+new_downstream_commits () {
+	test_commit -C downstream/sub/deepsub new-innermost &&
+	git -C downstream/sub add deepsub &&
+	git -C downstream/sub commit -m new-middle &&
+	git -C downstream add sub &&
+	git -C downstream commit -m new-outermost
+}
+
+test_expect_success 'push with push.recurseSubmodules=only on superproject' '
+	test_when_finished rm -rf upstream downstream &&
+	setup_subsub &&
+	new_downstream_commits &&
+	git -C downstream config push.recurseSubmodules only &&
+	git -C downstream push origin downstream-branch &&
+
+	test_must_fail git -C upstream rev-parse refs/heads/downstream-branch &&
+	git -C upstream/sub rev-parse refs/heads/downstream-branch &&
+	test_must_fail git -C upstream/sub/deepsub rev-parse refs/heads/downstream-branch
+'
+
+test_expect_success 'push with push.recurseSubmodules=only on superproject and top-level submodule' '
+	test_when_finished rm -rf upstream downstream &&
+	setup_subsub &&
+	new_downstream_commits &&
+	git -C downstream config push.recurseSubmodules only &&
+	git -C downstream/sub config push.recurseSubmodules only &&
+	git -C downstream push origin downstream-branch 2> err &&
+
+	test_must_fail git -C upstream rev-parse refs/heads/downstream-branch &&
+	git -C upstream/sub rev-parse refs/heads/downstream-branch &&
+	git -C upstream/sub/deepsub rev-parse refs/heads/downstream-branch &&
+	grep "recursing into submodule with push.recurseSubmodules=only; using on-demand instead" err
+'
+
 test_expect_success 'push propagating the remotes name to a submodule' '
 	git -C work remote add origin ../pub.git &&
 	git -C work remote add pub ../pub.git &&
@@ -517,14 +573,14 @@ test_expect_success 'push propagating the remotes name to a submodule' '
 	git -C work commit -m "Tenth junk added to gar/bage" &&
 
 	# Fails when submodule does not have a matching remote
-	test_must_fail git -C work push --recurse-submodules=on-demand pub master &&
+	test_must_fail git -C work push --recurse-submodules=on-demand pub main &&
 	# Succeeds when submodules has matching remote and refspec
-	git -C work push --recurse-submodules=on-demand origin master &&
+	git -C work push --recurse-submodules=on-demand origin main &&
 
-	git -C submodule.git rev-parse master >actual_submodule &&
-	git -C pub.git rev-parse master >actual_pub &&
-	git -C work/gar/bage rev-parse master >expected_submodule &&
-	git -C work rev-parse master >expected_pub &&
+	git -C submodule.git rev-parse main >actual_submodule &&
+	git -C pub.git rev-parse main >actual_pub &&
+	git -C work/gar/bage rev-parse main >expected_submodule &&
+	git -C work rev-parse main >expected_pub &&
 	test_cmp expected_submodule actual_submodule &&
 	test_cmp expected_pub actual_pub
 '
@@ -548,7 +604,7 @@ test_expect_success 'push propagating refspec to a submodule' '
 	test_must_fail git -C work push --recurse-submodules=on-demand origin \
 		HEAD:refs/heads/branch2 &&
 
-	git -C work/gar/bage branch branch2 master &&
+	git -C work/gar/bage branch branch2 main &&
 	git -C work push --recurse-submodules=on-demand origin branch2 &&
 
 	git -C submodule.git rev-parse branch2 >actual_submodule &&
diff --git a/t/t5532-fetch-proxy.sh b/t/t5532-fetch-proxy.sh
index 9c27986..d664912 100755
--- a/t/t5532-fetch-proxy.sh
+++ b/t/t5532-fetch-proxy.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='fetching via git:// using core.gitproxy'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup remote repo' '
diff --git a/t/t5533-push-cas.sh b/t/t5533-push-cas.sh
index 0b0eb1d..cba26a8 100755
--- a/t/t5533-push-cas.sh
+++ b/t/t5533-push-cas.sh
@@ -2,6 +2,9 @@
 
 test_description='compare & swap push force/delete safety'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 setup_srcdst_basic () {
@@ -13,6 +16,46 @@ setup_srcdst_basic () {
 	)
 }
 
+# For tests with "--force-if-includes".
+setup_src_dup_dst () {
+	rm -fr src dup dst &&
+	git init --bare dst &&
+	git clone --no-local dst src &&
+	git clone --no-local dst dup
+	(
+		cd src &&
+		test_commit A &&
+		test_commit B &&
+		test_commit C &&
+		git push origin
+	) &&
+	(
+		cd dup &&
+		git fetch &&
+		git merge origin/main &&
+		git switch -c branch main~2 &&
+		test_commit D &&
+		test_commit E &&
+		git push origin --all
+	) &&
+	(
+		cd src &&
+		git switch main &&
+		git fetch --all &&
+		git branch branch --track origin/branch &&
+		git rebase origin/main
+	) &&
+	(
+		cd dup &&
+		git switch main &&
+		test_commit F &&
+		test_commit G &&
+		git switch branch &&
+		test_commit H &&
+		git push origin --all
+	)
+}
+
 test_expect_success setup '
 	# create template repository
 	test_commit A &&
@@ -25,11 +68,11 @@ test_expect_success 'push to update (protected)' '
 	(
 		cd dst &&
 		test_commit D &&
-		test_must_fail git push --force-with-lease=master:master origin master 2>err &&
+		test_must_fail git push --force-with-lease=main:main origin main 2>err &&
 		grep "stale info" err
 	) &&
-	git ls-remote . refs/heads/master >expect &&
-	git ls-remote src refs/heads/master >actual &&
+	git ls-remote . refs/heads/main >expect &&
+	git ls-remote src refs/heads/main >actual &&
 	test_cmp expect actual
 '
 
@@ -38,11 +81,11 @@ test_expect_success 'push to update (protected, forced)' '
 	(
 		cd dst &&
 		test_commit D &&
-		git push --force --force-with-lease=master:master origin master 2>err &&
+		git push --force --force-with-lease=main:main origin main 2>err &&
 		grep "forced update" err
 	) &&
-	git ls-remote dst refs/heads/master >expect &&
-	git ls-remote src refs/heads/master >actual &&
+	git ls-remote dst refs/heads/main >expect &&
+	git ls-remote src refs/heads/main >actual &&
 	test_cmp expect actual
 '
 
@@ -50,20 +93,20 @@ test_expect_success 'push to update (protected, tracking)' '
 	setup_srcdst_basic &&
 	(
 		cd src &&
-		git checkout master &&
+		git checkout main &&
 		test_commit D &&
 		git checkout HEAD^0
 	) &&
-	git ls-remote src refs/heads/master >expect &&
+	git ls-remote src refs/heads/main >expect &&
 	(
 		cd dst &&
 		test_commit E &&
-		git ls-remote . refs/remotes/origin/master >expect &&
-		test_must_fail git push --force-with-lease=master origin master &&
-		git ls-remote . refs/remotes/origin/master >actual &&
+		git ls-remote . refs/remotes/origin/main >expect &&
+		test_must_fail git push --force-with-lease=main origin main &&
+		git ls-remote . refs/remotes/origin/main >actual &&
 		test_cmp expect actual
 	) &&
-	git ls-remote src refs/heads/master >actual &&
+	git ls-remote src refs/heads/main >actual &&
 	test_cmp expect actual
 '
 
@@ -71,18 +114,18 @@ test_expect_success 'push to update (protected, tracking, forced)' '
 	setup_srcdst_basic &&
 	(
 		cd src &&
-		git checkout master &&
+		git checkout main &&
 		test_commit D &&
 		git checkout HEAD^0
 	) &&
 	(
 		cd dst &&
 		test_commit E &&
-		git ls-remote . refs/remotes/origin/master >expect &&
-		git push --force --force-with-lease=master origin master
+		git ls-remote . refs/remotes/origin/main >expect &&
+		git push --force --force-with-lease=main origin main
 	) &&
-	git ls-remote dst refs/heads/master >expect &&
-	git ls-remote src refs/heads/master >actual &&
+	git ls-remote dst refs/heads/main >expect &&
+	git ls-remote src refs/heads/main >actual &&
 	test_cmp expect actual
 '
 
@@ -91,10 +134,10 @@ test_expect_success 'push to update (allowed)' '
 	(
 		cd dst &&
 		test_commit D &&
-		git push --force-with-lease=master:master^ origin master
+		git push --force-with-lease=main:main^ origin main
 	) &&
-	git ls-remote dst refs/heads/master >expect &&
-	git ls-remote src refs/heads/master >actual &&
+	git ls-remote dst refs/heads/main >expect &&
+	git ls-remote src refs/heads/main >actual &&
 	test_cmp expect actual
 '
 
@@ -103,11 +146,11 @@ test_expect_success 'push to update (allowed, tracking)' '
 	(
 		cd dst &&
 		test_commit D &&
-		git push --force-with-lease=master origin master 2>err &&
+		git push --force-with-lease=main origin main 2>err &&
 		! grep "forced update" err
 	) &&
-	git ls-remote dst refs/heads/master >expect &&
-	git ls-remote src refs/heads/master >actual &&
+	git ls-remote dst refs/heads/main >expect &&
+	git ls-remote src refs/heads/main >actual &&
 	test_cmp expect actual
 '
 
@@ -117,22 +160,22 @@ test_expect_success 'push to update (allowed even though no-ff)' '
 		cd dst &&
 		git reset --hard HEAD^ &&
 		test_commit D &&
-		git push --force-with-lease=master origin master 2>err &&
+		git push --force-with-lease=main origin main 2>err &&
 		grep "forced update" err
 	) &&
-	git ls-remote dst refs/heads/master >expect &&
-	git ls-remote src refs/heads/master >actual &&
+	git ls-remote dst refs/heads/main >expect &&
+	git ls-remote src refs/heads/main >actual &&
 	test_cmp expect actual
 '
 
 test_expect_success 'push to delete (protected)' '
 	setup_srcdst_basic &&
-	git ls-remote src refs/heads/master >expect &&
+	git ls-remote src refs/heads/main >expect &&
 	(
 		cd dst &&
-		test_must_fail git push --force-with-lease=master:master^ origin :master
+		test_must_fail git push --force-with-lease=main:main^ origin :main
 	) &&
-	git ls-remote src refs/heads/master >actual &&
+	git ls-remote src refs/heads/main >actual &&
 	test_cmp expect actual
 '
 
@@ -140,9 +183,9 @@ test_expect_success 'push to delete (protected, forced)' '
 	setup_srcdst_basic &&
 	(
 		cd dst &&
-		git push --force --force-with-lease=master:master^ origin :master
+		git push --force --force-with-lease=main:main^ origin :main
 	) &&
-	git ls-remote src refs/heads/master >actual &&
+	git ls-remote src refs/heads/main >actual &&
 	test_must_be_empty actual
 '
 
@@ -150,10 +193,10 @@ test_expect_success 'push to delete (allowed)' '
 	setup_srcdst_basic &&
 	(
 		cd dst &&
-		git push --force-with-lease=master origin :master 2>err &&
+		git push --force-with-lease=main origin :main 2>err &&
 		grep deleted err
 	) &&
-	git ls-remote src refs/heads/master >actual &&
+	git ls-remote src refs/heads/main >actual &&
 	test_must_be_empty actual
 '
 
@@ -161,12 +204,12 @@ test_expect_success 'cover everything with default force-with-lease (protected)'
 	setup_srcdst_basic &&
 	(
 		cd src &&
-		git branch naster master^
+		git branch nain main^
 	) &&
 	git ls-remote src refs/heads/\* >expect &&
 	(
 		cd dst &&
-		test_must_fail git push --force-with-lease origin master master:naster
+		test_must_fail git push --force-with-lease origin main main:nain
 	) &&
 	git ls-remote src refs/heads/\* >actual &&
 	test_cmp expect actual
@@ -176,16 +219,16 @@ test_expect_success 'cover everything with default force-with-lease (allowed)' '
 	setup_srcdst_basic &&
 	(
 		cd src &&
-		git branch naster master^
+		git branch nain main^
 	) &&
 	(
 		cd dst &&
 		git fetch &&
-		git push --force-with-lease origin master master:naster
+		git push --force-with-lease origin main main:nain
 	) &&
-	git ls-remote dst refs/heads/master |
-	sed -e "s/master/naster/" >expect &&
-	git ls-remote src refs/heads/naster >actual &&
+	git ls-remote dst refs/heads/main |
+	sed -e "s/main/nain/" >expect &&
+	git ls-remote src refs/heads/nain >actual &&
 	test_cmp expect actual
 '
 
@@ -193,7 +236,7 @@ test_expect_success 'new branch covered by force-with-lease' '
 	setup_srcdst_basic &&
 	(
 		cd dst &&
-		git branch branch master &&
+		git branch branch main &&
 		git push --force-with-lease=branch origin branch
 	) &&
 	git ls-remote dst refs/heads/branch >expect &&
@@ -205,7 +248,7 @@ test_expect_success 'new branch covered by force-with-lease (explicit)' '
 	setup_srcdst_basic &&
 	(
 		cd dst &&
-		git branch branch master &&
+		git branch branch main &&
 		git push --force-with-lease=branch: origin branch
 	) &&
 	git ls-remote dst refs/heads/branch >expect &&
@@ -217,12 +260,12 @@ test_expect_success 'new branch already exists' '
 	setup_srcdst_basic &&
 	(
 		cd src &&
-		git checkout -b branch master &&
+		git checkout -b branch main &&
 		test_commit F
 	) &&
 	(
 		cd dst &&
-		git branch branch master &&
+		git branch branch main &&
 		test_must_fail git push --force-with-lease=branch: origin branch
 	)
 '
@@ -237,7 +280,7 @@ test_expect_success 'background updates of REMOTE can be mitigated with a non-up
 		cd dst &&
 		test_commit G &&
 		git remote add origin-push ../src.bare &&
-		git push origin-push master:master
+		git push origin-push main:main
 	) &&
 	git clone --no-local src.bare dst2 &&
 	test_when_finished "rm -rf dst2" &&
@@ -256,4 +299,101 @@ test_expect_success 'background updates of REMOTE can be mitigated with a non-up
 	)
 '
 
+test_expect_success 'background updates to remote can be mitigated with "--force-if-includes"' '
+	setup_src_dup_dst &&
+	test_when_finished "rm -fr dst src dup" &&
+	git ls-remote dst refs/heads/main >expect.main &&
+	git ls-remote dst refs/heads/branch >expect.branch &&
+	(
+		cd src &&
+		git switch branch &&
+		test_commit I &&
+		git switch main &&
+		test_commit J &&
+		git fetch --all &&
+		test_must_fail git push --force-with-lease --force-if-includes --all
+	) &&
+	git ls-remote dst refs/heads/main >actual.main &&
+	git ls-remote dst refs/heads/branch >actual.branch &&
+	test_cmp expect.main actual.main &&
+	test_cmp expect.branch actual.branch
+'
+
+test_expect_success 'background updates to remote can be mitigated with "push.useForceIfIncludes"' '
+	setup_src_dup_dst &&
+	test_when_finished "rm -fr dst src dup" &&
+	git ls-remote dst refs/heads/main >expect.main &&
+	(
+		cd src &&
+		git switch branch &&
+		test_commit I &&
+		git switch main &&
+		test_commit J &&
+		git fetch --all &&
+		git config --local push.useForceIfIncludes true &&
+		test_must_fail git push --force-with-lease=main origin main
+	) &&
+	git ls-remote dst refs/heads/main >actual.main &&
+	test_cmp expect.main actual.main
+'
+
+test_expect_success '"--force-if-includes" should be disabled for --force-with-lease="<refname>:<expect>"' '
+	setup_src_dup_dst &&
+	test_when_finished "rm -fr dst src dup" &&
+	git ls-remote dst refs/heads/main >expect.main &&
+	(
+		cd src &&
+		git switch branch &&
+		test_commit I &&
+		git switch main &&
+		test_commit J &&
+		remote_head="$(git rev-parse refs/remotes/origin/main)" &&
+		git fetch --all &&
+		test_must_fail git push --force-if-includes --force-with-lease="main:$remote_head" 2>err &&
+		grep "stale info" err
+	) &&
+	git ls-remote dst refs/heads/main >actual.main &&
+	test_cmp expect.main actual.main
+'
+
+test_expect_success '"--force-if-includes" should allow forced update after a rebase ("pull --rebase")' '
+	setup_src_dup_dst &&
+	test_when_finished "rm -fr dst src dup" &&
+	(
+		cd src &&
+		git switch branch &&
+		test_commit I &&
+		git switch main &&
+		test_commit J &&
+		git pull --rebase origin main &&
+		git push --force-if-includes --force-with-lease="main"
+	)
+'
+
+test_expect_success '"--force-if-includes" should allow forced update after a rebase ("pull --rebase", local rebase)' '
+	setup_src_dup_dst &&
+	test_when_finished "rm -fr dst src dup" &&
+	(
+		cd src &&
+		git switch branch &&
+		test_commit I &&
+		git switch main &&
+		test_commit J &&
+		git pull --rebase origin main &&
+		git rebase --onto HEAD~4 HEAD~1 &&
+		git push --force-if-includes --force-with-lease="main"
+	)
+'
+
+test_expect_success '"--force-if-includes" should allow deletes' '
+	setup_src_dup_dst &&
+	test_when_finished "rm -fr dst src dup" &&
+	(
+		cd src &&
+		git switch branch &&
+		git pull --rebase origin branch &&
+		git push --force-if-includes --force-with-lease="branch" origin :branch
+	)
+'
+
 test_done
diff --git a/t/t5534-push-signed.sh b/t/t5534-push-signed.sh
index 030331f..c91a62b 100755
--- a/t/t5534-push-signed.sh
+++ b/t/t5534-push-signed.sh
@@ -2,6 +2,9 @@
 
 test_description='signed push'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-gpg.sh
 
@@ -9,11 +12,11 @@ prepare_dst () {
 	rm -fr dst &&
 	test_create_repo dst &&
 
-	git push dst master:noop master:ff master:noff
+	git push dst main:noop main:ff main:noff
 }
 
 test_expect_success setup '
-	# master, ff and noff branches pointing at the same commit
+	# main, ff and noff branches pointing at the same commit
 	test_tick &&
 	git commit --allow-empty -m initial &&
 
@@ -32,8 +35,7 @@ test_expect_success setup '
 
 test_expect_success 'unsigned push does not send push certificate' '
 	prepare_dst &&
-	mkdir -p dst/.git/hooks &&
-	write_script dst/.git/hooks/post-receive <<-\EOF &&
+	test_hook -C dst post-receive <<-\EOF &&
 	# discard the update list
 	cat >/dev/null
 	# record the push certificate
@@ -49,8 +51,7 @@ test_expect_success 'unsigned push does not send push certificate' '
 
 test_expect_success 'talking with a receiver without push certificate support' '
 	prepare_dst &&
-	mkdir -p dst/.git/hooks &&
-	write_script dst/.git/hooks/post-receive <<-\EOF &&
+	test_hook -C dst post-receive <<-\EOF &&
 	# discard the update list
 	cat >/dev/null
 	# record the push certificate
@@ -66,22 +67,19 @@ test_expect_success 'talking with a receiver without push certificate support' '
 
 test_expect_success 'push --signed fails with a receiver without push certificate support' '
 	prepare_dst &&
-	mkdir -p dst/.git/hooks &&
 	test_must_fail git push --signed dst noop ff +noff 2>err &&
-	test_i18ngrep "the receiving end does not support" err
+	test_grep "the receiving end does not support" err
 '
 
 test_expect_success 'push --signed=1 is accepted' '
 	prepare_dst &&
-	mkdir -p dst/.git/hooks &&
 	test_must_fail git push --signed=1 dst noop ff +noff 2>err &&
-	test_i18ngrep "the receiving end does not support" err
+	test_grep "the receiving end does not support" err
 '
 
 test_expect_success GPG 'no certificate for a signed push with no update' '
 	prepare_dst &&
-	mkdir -p dst/.git/hooks &&
-	write_script dst/.git/hooks/post-receive <<-\EOF &&
+	test_hook -C dst post-receive <<-\EOF &&
 	if test -n "${GIT_PUSH_CERT-}"
 	then
 		git cat-file blob $GIT_PUSH_CERT >../push-cert
@@ -93,9 +91,8 @@ test_expect_success GPG 'no certificate for a signed push with no update' '
 
 test_expect_success GPG 'signed push sends push certificate' '
 	prepare_dst &&
-	mkdir -p dst/.git/hooks &&
 	git -C dst config receive.certnonceseed sekrit &&
-	write_script dst/.git/hooks/post-receive <<-\EOF &&
+	test_hook -C dst post-receive <<-\EOF &&
 	# discard the update list
 	cat >/dev/null
 	# record the push certificate
@@ -134,6 +131,52 @@ test_expect_success GPG 'signed push sends push certificate' '
 	test_cmp expect dst/push-cert-status
 '
 
+test_expect_success GPGSSH 'ssh signed push sends push certificate' '
+	prepare_dst &&
+	git -C dst config gpg.ssh.allowedSignersFile "${GPGSSH_ALLOWED_SIGNERS}" &&
+	git -C dst config receive.certnonceseed sekrit &&
+	test_hook -C dst post-receive <<-\EOF &&
+	# discard the update list
+	cat >/dev/null
+	# record the push certificate
+	if test -n "${GIT_PUSH_CERT-}"
+	then
+		git cat-file blob $GIT_PUSH_CERT >../push-cert
+	fi &&
+
+	cat >../push-cert-status <<E_O_F
+	SIGNER=${GIT_PUSH_CERT_SIGNER-nobody}
+	KEY=${GIT_PUSH_CERT_KEY-nokey}
+	STATUS=${GIT_PUSH_CERT_STATUS-nostatus}
+	NONCE_STATUS=${GIT_PUSH_CERT_NONCE_STATUS-nononcestatus}
+	NONCE=${GIT_PUSH_CERT_NONCE-nononce}
+	E_O_F
+
+	EOF
+
+	test_config gpg.format ssh &&
+	test_config user.signingkey "${GPGSSH_KEY_PRIMARY}" &&
+	FINGERPRINT=$(ssh-keygen -lf "${GPGSSH_KEY_PRIMARY}" | awk "{print \$2;}") &&
+	git push --signed dst noop ff +noff &&
+
+	(
+		cat <<-\EOF &&
+		SIGNER=principal with number 1
+		KEY=FINGERPRINT
+		STATUS=G
+		NONCE_STATUS=OK
+		EOF
+		sed -n -e "s/^nonce /NONCE=/p" -e "/^$/q" dst/push-cert
+	) | sed -e "s|FINGERPRINT|$FINGERPRINT|" >expect &&
+
+	noop=$(git rev-parse noop) &&
+	ff=$(git rev-parse ff) &&
+	noff=$(git rev-parse noff) &&
+	grep "$noop $ff refs/heads/ff" dst/push-cert &&
+	grep "$noop $noff refs/heads/noff" dst/push-cert &&
+	test_cmp expect dst/push-cert-status
+'
+
 test_expect_success GPG 'inconsistent push options in signed push not allowed' '
 	# First, invoke receive-pack with dummy input to obtain its preamble.
 	prepare_dst &&
@@ -173,9 +216,8 @@ test_expect_success GPG 'inconsistent push options in signed push not allowed' '
 
 test_expect_success GPG 'fail without key and heed user.signingkey' '
 	prepare_dst &&
-	mkdir -p dst/.git/hooks &&
 	git -C dst config receive.certnonceseed sekrit &&
-	write_script dst/.git/hooks/post-receive <<-\EOF &&
+	test_hook -C dst post-receive <<-\EOF &&
 	# discard the update list
 	cat >/dev/null
 	# record the push certificate
@@ -223,9 +265,8 @@ test_expect_success GPG 'fail without key and heed user.signingkey' '
 test_expect_success GPGSM 'fail without key and heed user.signingkey x509' '
 	test_config gpg.format x509 &&
 	prepare_dst &&
-	mkdir -p dst/.git/hooks &&
 	git -C dst config receive.certnonceseed sekrit &&
-	write_script dst/.git/hooks/post-receive <<-\EOF &&
+	test_hook -C dst post-receive <<-\EOF &&
 	# discard the update list
 	cat >/dev/null
 	# record the push certificate
@@ -262,7 +303,7 @@ test_expect_success GPGSM 'fail without key and heed user.signingkey x509' '
 		EOF
 		sed -n -e "s/^nonce /NONCE=/p" -e "/^$/q" dst/push-cert
 	) >expect.in &&
-	key=$(cat "${GNUPGHOME}/trustlist.txt" | cut -d" " -f1 | tr -d ":") &&
+	key=$(cut -d" " -f1 <"${GNUPGHOME}/trustlist.txt" | tr -d ":") &&
 	sed -e "s/^KEY=/KEY=${key}/" expect.in >expect &&
 
 	noop=$(git rev-parse noop) &&
@@ -273,4 +314,79 @@ test_expect_success GPGSM 'fail without key and heed user.signingkey x509' '
 	test_cmp expect dst/push-cert-status
 '
 
+test_expect_success GPGSSH 'fail without key and heed user.signingkey ssh' '
+	test_config gpg.format ssh &&
+	prepare_dst &&
+	git -C dst config gpg.ssh.allowedSignersFile "${GPGSSH_ALLOWED_SIGNERS}" &&
+	git -C dst config receive.certnonceseed sekrit &&
+	test_hook -C dst post-receive <<-\EOF &&
+	# discard the update list
+	cat >/dev/null
+	# record the push certificate
+	if test -n "${GIT_PUSH_CERT-}"
+	then
+		git cat-file blob $GIT_PUSH_CERT >../push-cert
+	fi &&
+
+	cat >../push-cert-status <<E_O_F
+	SIGNER=${GIT_PUSH_CERT_SIGNER-nobody}
+	KEY=${GIT_PUSH_CERT_KEY-nokey}
+	STATUS=${GIT_PUSH_CERT_STATUS-nostatus}
+	NONCE_STATUS=${GIT_PUSH_CERT_NONCE_STATUS-nononcestatus}
+	NONCE=${GIT_PUSH_CERT_NONCE-nononce}
+	E_O_F
+
+	EOF
+
+	test_config user.email hasnokey@nowhere.com &&
+	test_config gpg.format ssh &&
+	test_config user.signingkey "" &&
+	(
+		sane_unset GIT_COMMITTER_EMAIL &&
+		test_must_fail git push --signed dst noop ff +noff
+	) &&
+	test_config user.signingkey "${GPGSSH_KEY_PRIMARY}" &&
+	FINGERPRINT=$(ssh-keygen -lf "${GPGSSH_KEY_PRIMARY}" | awk "{print \$2;}") &&
+	git push --signed dst noop ff +noff &&
+
+	(
+		cat <<-\EOF &&
+		SIGNER=principal with number 1
+		KEY=FINGERPRINT
+		STATUS=G
+		NONCE_STATUS=OK
+		EOF
+		sed -n -e "s/^nonce /NONCE=/p" -e "/^$/q" dst/push-cert
+	) | sed -e "s|FINGERPRINT|$FINGERPRINT|" >expect &&
+
+	noop=$(git rev-parse noop) &&
+	ff=$(git rev-parse ff) &&
+	noff=$(git rev-parse noff) &&
+	grep "$noop $ff refs/heads/ff" dst/push-cert &&
+	grep "$noop $noff refs/heads/noff" dst/push-cert &&
+	test_cmp expect dst/push-cert-status
+'
+
+test_expect_success GPG 'failed atomic push does not execute GPG' '
+	prepare_dst &&
+	git -C dst config receive.certnonceseed sekrit &&
+	write_script gpg <<-EOF &&
+	# should check atomic push locally before running GPG.
+	exit 1
+	EOF
+	test_must_fail env PATH="$TRASH_DIRECTORY:$PATH" git push \
+			--signed --atomic --porcelain \
+			dst noop ff noff >out 2>err &&
+
+	test_grep ! "gpg failed to sign" err &&
+	cat >expect <<-EOF &&
+	To dst
+	=	refs/heads/noop:refs/heads/noop	[up to date]
+	!	refs/heads/ff:refs/heads/ff	[rejected] (atomic push failed)
+	!	refs/heads/noff:refs/heads/noff	[rejected] (non-fast-forward)
+	Done
+	EOF
+	test_cmp expect out
+'
+
 test_done
diff --git a/t/t5536-fetch-conflicts.sh b/t/t5536-fetch-conflicts.sh
index 91f28c2..23bf696 100755
--- a/t/t5536-fetch-conflicts.sh
+++ b/t/t5536-fetch-conflicts.sh
@@ -40,7 +40,7 @@ test_expect_success 'fetch conflict: config vs. config' '
 		"+refs/heads/branch2:refs/remotes/origin/branch1" && (
 		cd ccc &&
 		test_must_fail git fetch origin 2>error &&
-		test_i18ngrep "fatal: Cannot fetch both refs/heads/branch1 and refs/heads/branch2 to refs/remotes/origin/branch1" error
+		test_grep "fatal: Cannot fetch both refs/heads/branch1 and refs/heads/branch2 to refs/remotes/origin/branch1" error
 	)
 '
 
@@ -67,7 +67,7 @@ test_expect_success 'fetch conflict: arg vs. arg' '
 		test_must_fail git fetch origin \
 			refs/heads/*:refs/remotes/origin/* \
 			refs/heads/branch2:refs/remotes/origin/branch1 2>error &&
-		test_i18ngrep "fatal: Cannot fetch both refs/heads/branch1 and refs/heads/branch2 to refs/remotes/origin/branch1" error
+		test_grep "fatal: Cannot fetch both refs/heads/branch1 and refs/heads/branch2 to refs/remotes/origin/branch1" error
 	)
 '
 
@@ -78,8 +78,8 @@ test_expect_success 'fetch conflict: criss-cross args' '
 		git fetch origin \
 			refs/heads/branch1:refs/remotes/origin/branch2 \
 			refs/heads/branch2:refs/remotes/origin/branch1 2>error &&
-		test_i18ngrep "warning: refs/remotes/origin/branch1 usually tracks refs/heads/branch1, not refs/heads/branch2" error &&
-		test_i18ngrep "warning: refs/remotes/origin/branch2 usually tracks refs/heads/branch2, not refs/heads/branch1" error
+		test_grep "warning: refs/remotes/origin/branch1 usually tracks refs/heads/branch1, not refs/heads/branch2" error &&
+		test_grep "warning: refs/remotes/origin/branch2 usually tracks refs/heads/branch2, not refs/heads/branch1" error
 	)
 '
 
diff --git a/t/t5537-fetch-shallow.sh b/t/t5537-fetch-shallow.sh
index a55202d..37f7547 100755
--- a/t/t5537-fetch-shallow.sh
+++ b/t/t5537-fetch-shallow.sh
@@ -2,6 +2,9 @@
 
 test_description='fetch/clone from a shallow clone'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 commit() {
@@ -49,7 +52,7 @@ test_expect_success 'fetch from shallow clone' '
 	cd shallow2 &&
 	git fetch &&
 	git fsck &&
-	git log --format=%s origin/master >actual &&
+	git log --format=%s origin/main >actual &&
 	test_write_lines 5 4 3 >expect &&
 	test_cmp expect actual
 	)
@@ -64,7 +67,7 @@ test_expect_success 'fetch --depth from shallow clone' '
 	cd shallow2 &&
 	git fetch --depth=2 &&
 	git fsck &&
-	git log --format=%s origin/master >actual &&
+	git log --format=%s origin/main >actual &&
 	test_write_lines 6 5 >expect &&
 	test_cmp expect actual
 	)
@@ -75,7 +78,7 @@ test_expect_success 'fetch --unshallow from shallow clone' '
 	cd shallow2 &&
 	git fetch --unshallow &&
 	git fsck &&
-	git log --format=%s origin/master >actual &&
+	git log --format=%s origin/main >actual &&
 	test_write_lines 6 5 4 3 >expect &&
 	test_cmp expect actual
 	)
@@ -89,7 +92,7 @@ test_expect_success 'fetch --unshallow from a full clone' '
 	test_write_lines 4 3 >expect &&
 	test_cmp expect actual &&
 	git -c fetch.writeCommitGraph fetch --unshallow &&
-	git log origin/master --format=%s >actual &&
+	git log origin/main --format=%s >actual &&
 	test_write_lines 4 3 2 1 >expect &&
 	test_cmp expect actual
 	)
@@ -104,9 +107,9 @@ test_expect_success 'fetch something upstream has but hidden by clients shallow
 	git commit -m add-1-back &&
 	(
 	cd shallow2 &&
-	git fetch ../.git +refs/heads/master:refs/remotes/top/master &&
+	git fetch ../.git +refs/heads/main:refs/remotes/top/main &&
 	git fsck &&
-	git log --format=%s top/master >actual &&
+	git log --format=%s top/main >actual &&
 	test_write_lines add-1-back 4 3 >expect &&
 	test_cmp expect actual
 	) &&
@@ -135,7 +138,7 @@ test_expect_success 'fetch that requires changes in .git/shallow is filtered' '
 test_expect_success 'fetch --update-shallow' '
 	(
 	cd shallow &&
-	git checkout master &&
+	git checkout main &&
 	commit 7 &&
 	git tag -m foo heavy-tag HEAD^ &&
 	git tag light-tag HEAD^:tracked
@@ -146,22 +149,46 @@ test_expect_success 'fetch --update-shallow' '
 	git fsck &&
 	git for-each-ref --sort=refname --format="%(refname)" >actual.refs &&
 	cat <<-\EOF >expect.refs &&
-	refs/remotes/shallow/master
+	refs/remotes/shallow/main
 	refs/remotes/shallow/no-shallow
 	refs/tags/heavy-tag
 	refs/tags/light-tag
 	EOF
 	test_cmp expect.refs actual.refs &&
-	git log --format=%s shallow/master >actual &&
+	git log --format=%s shallow/main >actual &&
 	test_write_lines 7 6 5 4 3 >expect &&
 	test_cmp expect actual
 	)
 '
 
+test_expect_success 'fetch --update-shallow into a repo with submodules' '
+	test_config_global protocol.file.allow always &&
+
+	git init a-submodule &&
+	test_commit -C a-submodule foo &&
+
+	test_when_finished "rm -rf repo-with-sub" &&
+	git init repo-with-sub &&
+	git -C repo-with-sub submodule add ../a-submodule a-submodule &&
+	git -C repo-with-sub commit -m "added submodule" &&
+	git -C repo-with-sub fetch --update-shallow ../shallow/.git refs/heads/*:refs/remotes/shallow/*
+'
+
+test_expect_success 'fetch --update-shallow a commit that is also a shallow point into a repo with submodules' '
+	test_when_finished "rm -rf repo-with-sub" &&
+	git init repo-with-sub &&
+	git -c protocol.file.allow=always -C repo-with-sub \
+		submodule add ../a-submodule a-submodule &&
+	git -C repo-with-sub commit -m "added submodule" &&
+
+	SHALLOW=$(cat shallow/.git/shallow) &&
+	git -C repo-with-sub fetch --update-shallow ../shallow/.git "$SHALLOW":refs/heads/a-shallow
+'
+
 test_expect_success 'fetch --update-shallow (with fetch.writeCommitGraph)' '
 	(
 	cd shallow &&
-	git checkout master &&
+	git checkout main &&
 	commit 8 &&
 	git tag -m foo heavy-tag-for-graph HEAD^ &&
 	git tag light-tag-for-graph HEAD^:tracked
@@ -173,7 +200,7 @@ test_expect_success 'fetch --update-shallow (with fetch.writeCommitGraph)' '
 	git fsck &&
 	git for-each-ref --sort=refname --format="%(refname)" >actual.refs &&
 	cat <<-EOF >expect.refs &&
-	refs/remotes/shallow/master
+	refs/remotes/shallow/main
 	refs/remotes/shallow/no-shallow
 	refs/tags/heavy-tag
 	refs/tags/heavy-tag-for-graph
@@ -181,7 +208,7 @@ test_expect_success 'fetch --update-shallow (with fetch.writeCommitGraph)' '
 	refs/tags/light-tag-for-graph
 	EOF
 	test_cmp expect.refs actual.refs &&
-	git log --format=%s shallow/master >actual &&
+	git log --format=%s shallow/main >actual &&
 	test_write_lines 8 7 6 5 4 3 >expect &&
 	test_cmp expect actual
 	)
@@ -206,7 +233,7 @@ test_expect_success '.git/shallow is edited by repack' '
 	test_commit -C shallow-server E &&
 	test_commit -C shallow-server D &&
 	d="$(git -C shallow-server rev-parse --verify D^0)" &&
-	git -C shallow-server checkout master &&
+	git -C shallow-server checkout main &&
 
 	git clone --depth=1 --no-tags --no-single-branch \
 		"file://$PWD/shallow-server" shallow-client &&
@@ -244,7 +271,7 @@ test_expect_success 'shallow fetches check connectivity before writing shallow f
 	git -C "$REPO" config protocol.version 2 &&
 	git -C client config protocol.version 2 &&
 
-	git -C client fetch --depth=2 "$HTTPD_URL/one_time_perl/repo" master:a_branch &&
+	git -C client fetch --depth=2 "$HTTPD_URL/one_time_perl/repo" main:a_branch &&
 
 	# Craft a situation in which the server sends back an unshallow request
 	# with an empty packfile. This is done by refetching with a shorter
@@ -256,7 +283,7 @@ test_expect_success 'shallow fetches check connectivity before writing shallow f
 	       >"$HTTPD_ROOT_PATH/one-time-perl" &&
 	test_must_fail env GIT_TEST_SIDEBAND_ALL=0 git -C client \
 		fetch --depth=1 "$HTTPD_URL/one_time_perl/repo" \
-		master:a_branch &&
+		main:a_branch &&
 
 	# Ensure that the one-time-perl script was used.
 	! test -e "$HTTPD_ROOT_PATH/one-time-perl" &&
diff --git a/t/t5538-push-shallow.sh b/t/t5538-push-shallow.sh
index ecbf84d..e91fcc1 100755
--- a/t/t5538-push-shallow.sh
+++ b/t/t5538-push-shallow.sh
@@ -2,6 +2,9 @@
 
 test_description='push from/to a shallow clone'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 commit() {
@@ -44,9 +47,9 @@ test_expect_success 'push from shallow clone' '
 	(
 	cd shallow &&
 	commit 5 &&
-	git push ../.git +master:refs/remotes/shallow/master
+	git push ../.git +main:refs/remotes/shallow/main
 	) &&
-	git log --format=%s shallow/master >actual &&
+	git log --format=%s shallow/main >actual &&
 	git fsck &&
 	cat <<EOF >expect &&
 5
@@ -61,10 +64,10 @@ EOF
 test_expect_success 'push from shallow clone, with grafted roots' '
 	(
 	cd shallow2 &&
-	test_must_fail git push ../.git +master:refs/remotes/shallow2/master 2>err &&
-	grep "shallow2/master.*shallow update not allowed" err
+	test_must_fail git push ../.git +main:refs/remotes/shallow2/main 2>err &&
+	grep "shallow2/main.*shallow update not allowed" err
 	) &&
-	test_must_fail git rev-parse shallow2/master &&
+	test_must_fail git rev-parse shallow2/main &&
 	git fsck
 '
 
@@ -72,9 +75,9 @@ test_expect_success 'add new shallow root with receive.updateshallow on' '
 	test_config receive.shallowupdate true &&
 	(
 	cd shallow2 &&
-	git push ../.git +master:refs/remotes/shallow2/master
+	git push ../.git +main:refs/remotes/shallow2/main
 	) &&
-	git log --format=%s shallow2/master >actual &&
+	git log --format=%s shallow2/main >actual &&
 	git fsck &&
 	cat <<EOF >expect &&
 c
@@ -87,12 +90,12 @@ test_expect_success 'push from shallow to shallow' '
 	(
 	cd shallow &&
 	git --git-dir=../shallow2/.git config receive.shallowupdate true &&
-	git push ../shallow2/.git +master:refs/remotes/shallow/master &&
+	git push ../shallow2/.git +main:refs/remotes/shallow/main &&
 	git --git-dir=../shallow2/.git config receive.shallowupdate false
 	) &&
 	(
 	cd shallow2 &&
-	git log --format=%s shallow/master >actual &&
+	git log --format=%s shallow/main >actual &&
 	git fsck &&
 	cat <<EOF >expect &&
 5
@@ -106,10 +109,10 @@ EOF
 test_expect_success 'push from full to shallow' '
 	! git --git-dir=shallow2/.git cat-file blob $(echo 1|git hash-object --stdin) &&
 	commit 1 &&
-	git push shallow2/.git +master:refs/remotes/top/master &&
+	git push shallow2/.git +main:refs/remotes/top/main &&
 	(
 	cd shallow2 &&
-	git log --format=%s top/master >actual &&
+	git log --format=%s top/main >actual &&
 	git fsck &&
 	cat <<EOF >expect &&
 1
diff --git a/t/t5539-fetch-http-shallow.sh b/t/t5539-fetch-http-shallow.sh
index 82aa99a..3ea75d3 100755
--- a/t/t5539-fetch-http-shallow.sh
+++ b/t/t5539-fetch-http-shallow.sh
@@ -2,6 +2,9 @@
 
 test_description='fetch/clone from a shallow clone over http'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-httpd.sh
 start_httpd
@@ -32,7 +35,7 @@ test_expect_success 'clone http repository' '
 	(
 	cd clone &&
 	git fsck &&
-	git log --format=%s origin/master >actual &&
+	git log --format=%s origin/main >actual &&
 	cat <<EOF >expect &&
 7
 6
@@ -60,9 +63,9 @@ test_expect_success 'no shallow lines after receiving ACK ready' '
 				refs/heads/unrelated$i:refs/heads/unrelated$i ||
 			exit 1
 		done &&
-		git checkout master &&
+		git checkout main &&
 		test_commit new &&
-		git push  "$HTTPD_DOCUMENT_ROOT_PATH/repo.git" master
+		git push  "$HTTPD_DOCUMENT_ROOT_PATH/repo.git" main
 	) &&
 	(
 		cd clone &&
@@ -95,7 +98,7 @@ test_expect_success 'clone shallow since ...' '
 
 test_expect_success 'fetch shallow since ...' '
 	git -C shallow11 fetch --shallow-since "200000000 +0700" origin &&
-	git -C shallow11 log --pretty=tformat:%s origin/master >actual &&
+	git -C shallow11 log --pretty=tformat:%s origin/main >actual &&
 	cat >expected <<-\EOF &&
 	three
 	two
@@ -120,7 +123,7 @@ test_expect_success 'shallow clone exclude tag two' '
 
 test_expect_success 'fetch exclude tag one' '
 	git -C shallow12 fetch --shallow-exclude one origin &&
-	git -C shallow12 log --pretty=tformat:%s origin/master >actual &&
+	git -C shallow12 log --pretty=tformat:%s origin/main >actual &&
 	test_write_lines three two >expected &&
 	test_cmp expected actual
 '
@@ -136,12 +139,12 @@ test_expect_success 'fetching deepen' '
 	git clone --depth 1 $HTTPD_URL/smart/shallow-deepen.git deepen &&
 	mv "$HTTPD_DOCUMENT_ROOT_PATH/shallow-deepen.git" .git &&
 	test_commit four &&
-	git -C deepen log --pretty=tformat:%s master >actual &&
+	git -C deepen log --pretty=tformat:%s main >actual &&
 	echo three >expected &&
 	test_cmp expected actual &&
 	mv .git "$HTTPD_DOCUMENT_ROOT_PATH/shallow-deepen.git" &&
 	git -C deepen fetch --deepen=1 &&
-	git -C deepen log --pretty=tformat:%s origin/master >actual &&
+	git -C deepen log --pretty=tformat:%s origin/main >actual &&
 	cat >expected <<-\EOF &&
 	four
 	three
diff --git a/t/t5540-http-push-webdav.sh b/t/t5540-http-push-webdav.sh
index 450321f..37db3de 100755
--- a/t/t5540-http-push-webdav.sh
+++ b/t/t5540-http-push-webdav.sh
@@ -7,6 +7,9 @@ test_description='test WebDAV http-push
 
 This test runs various sanity checks on http-push.'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 if git http-push > /dev/null 2>&1 || [ $? -eq 128 ]
@@ -15,6 +18,12 @@ then
 	test_done
 fi
 
+if test_have_prereq !REFFILES
+then
+	skip_all='skipping test; dumb HTTP protocol not supported with reftable.'
+	test_done
+fi
+
 LIB_HTTPD_DAV=t
 . "$TEST_DIRECTORY"/lib-httpd.sh
 ROOT_PATH="$PWD"
@@ -33,7 +42,9 @@ test_expect_success 'setup remote repository' '
 	git clone --bare test_repo test_repo.git &&
 	cd test_repo.git &&
 	git --bare update-server-info &&
-	mv hooks/post-update.sample hooks/post-update &&
+	test_hook --setup post-update <<-\EOF &&
+	exec git update-server-info
+	EOF
 	ORIG_HEAD=$(git rev-parse --verify HEAD) &&
 	cd - &&
 	mv test_repo.git "$HTTPD_DOCUMENT_ROOT_PATH"
@@ -71,7 +82,7 @@ test_expect_success 'push already up-to-date' '
 test_expect_success 'push to remote repository with unpacked refs' '
 	(cd "$HTTPD_DOCUMENT_ROOT_PATH"/test_repo.git &&
 	 rm packed-refs &&
-	 git update-ref refs/heads/master $ORIG_HEAD &&
+	 git update-ref refs/heads/main $ORIG_HEAD &&
 	 git --bare update-server-info) &&
 	git push &&
 	(cd "$HTTPD_DOCUMENT_ROOT_PATH"/test_repo.git &&
@@ -91,7 +102,7 @@ test_expect_success 'http-push fetches unpacked objects' '
 	 git remote rm origin &&
 	 git reflog expire --expire=0 --all &&
 	 git prune &&
-	 git push -f -v $HTTPD_URL/dumb/test_repo_unpacked.git master)
+	 git push -f -v $HTTPD_URL/dumb/test_repo_unpacked.git main)
 '
 
 test_expect_success 'http-push fetches packed objects' '
@@ -111,7 +122,7 @@ test_expect_success 'http-push fetches packed objects' '
 	 git remote remove origin &&
 	 git reflog expire --expire=0 --all &&
 	 git prune &&
-	 git push -f -v $HTTPD_URL/dumb/test_repo_packed.git master)
+	 git push -f -v $HTTPD_URL/dumb/test_repo_packed.git main)
 '
 
 test_expect_success 'create and delete remote branch' '
@@ -163,7 +174,7 @@ test_expect_success 'PUT and MOVE sends object to URLs with SHA-1 hash suffix' '
 '
 
 test_http_push_nonff "$HTTPD_DOCUMENT_ROOT_PATH"/test_repo.git \
-	"$ROOT_PATH"/test_repo_clone master
+	"$ROOT_PATH"/test_repo_clone main
 
 test_expect_success 'push to password-protected repository (user in URL)' '
 	test_commit pw-user &&
diff --git a/t/t5541-http-push-smart.sh b/t/t5541-http-push-smart.sh
index 187454f..71428f3 100755
--- a/t/t5541-http-push-smart.sh
+++ b/t/t5541-http-push-smart.sh
@@ -4,6 +4,9 @@
 #
 
 test_description='test smart pushing over http via http-backend'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 ROOT_PATH="$PWD"
@@ -33,28 +36,6 @@ test_expect_success 'setup remote repository' '
 
 setup_askpass_helper
 
-cat >exp <<EOF
-GET  /smart/test_repo.git/info/refs?service=git-upload-pack HTTP/1.1 200
-POST /smart/test_repo.git/git-upload-pack HTTP/1.1 200
-EOF
-test_expect_success 'no empty path components' '
-	# Clear the log, so that it does not affect the "used receive-pack
-	# service" test which reads the log too.
-	test_when_finished ">\"\$HTTPD_ROOT_PATH\"/access.log" &&
-
-	# In the URL, add a trailing slash, and see if git appends yet another
-	# slash.
-	cd "$ROOT_PATH" &&
-	git clone $HTTPD_URL/smart/test_repo.git/ test_repo_clone &&
-
-	# NEEDSWORK: If the overspecification of the expected result is reduced, we
-	# might be able to run this test in all protocol versions.
-	if test "$GIT_TEST_PROTOCOL_VERSION" = 0
-	then
-		check_access_log exp
-	fi
-'
-
 test_expect_success 'clone remote repository' '
 	rm -rf test_repo_clone &&
 	git clone $HTTPD_URL/smart/test_repo.git test_repo_clone &&
@@ -64,6 +45,10 @@ test_expect_success 'clone remote repository' '
 '
 
 test_expect_success 'push to remote repository (standard)' '
+	# Clear the log, so that the "used receive-pack service" test below
+	# sees just what we did here.
+	>"$HTTPD_ROOT_PATH"/access.log &&
+
 	cd "$ROOT_PATH"/test_repo_clone &&
 	: >path2 &&
 	git add path2 &&
@@ -77,6 +62,34 @@ test_expect_success 'push to remote repository (standard)' '
 	 test $HEAD = $(git rev-parse --verify HEAD))
 '
 
+test_expect_success 'used receive-pack service' '
+	cat >exp <<-\EOF &&
+	GET  /smart/test_repo.git/info/refs?service=git-receive-pack HTTP/1.1 200
+	POST /smart/test_repo.git/git-receive-pack HTTP/1.1 200
+	EOF
+
+	check_access_log exp
+'
+
+test_expect_success 'push to remote repository (standard) with sending Accept-Language' '
+	cat >exp <<-\EOF &&
+	=> Send header: Accept-Language: ko-KR, *;q=0.9
+	=> Send header: Accept-Language: ko-KR, *;q=0.9
+	EOF
+
+	cd "$ROOT_PATH"/test_repo_clone &&
+	: >path_lang &&
+	git add path_lang &&
+	test_tick &&
+	git commit -m path_lang &&
+	HEAD=$(git rev-parse --verify HEAD) &&
+	GIT_TRACE_CURL=true LANGUAGE="ko_KR.UTF-8" git push -v -v 2>err &&
+	! grep "Expect: 100-continue" err &&
+
+	grep "=> Send header: Accept-Language:" err >err.language &&
+	test_cmp exp err.language
+'
+
 test_expect_success 'push already up-to-date' '
 	git push
 '
@@ -93,18 +106,18 @@ test_expect_success 'create and delete remote branch' '
 	test_must_fail git show-ref --verify refs/remotes/origin/dev
 '
 
-cat >"$HTTPD_DOCUMENT_ROOT_PATH/test_repo.git/hooks/update" <<EOF
-#!/bin/sh
-exit 1
-EOF
-chmod a+x "$HTTPD_DOCUMENT_ROOT_PATH/test_repo.git/hooks/update"
+test_expect_success 'setup rejected update hook' '
+	test_hook --setup -C "$HTTPD_DOCUMENT_ROOT_PATH/test_repo.git" update <<-\EOF &&
+	exit 1
+	EOF
 
-cat >exp <<EOF
-remote: error: hook declined to update refs/heads/dev2
-To http://127.0.0.1:$LIB_HTTPD_PORT/smart/test_repo.git
- ! [remote rejected] dev2 -> dev2 (hook declined)
-error: failed to push some refs to 'http://127.0.0.1:$LIB_HTTPD_PORT/smart/test_repo.git'
-EOF
+	cat >exp <<-EOF
+	remote: error: hook declined to update refs/heads/dev2
+	To http://127.0.0.1:$LIB_HTTPD_PORT/smart/test_repo.git
+	 ! [remote rejected] dev2 -> dev2 (hook declined)
+	error: failed to push some refs to '\''http://127.0.0.1:$LIB_HTTPD_PORT/smart/test_repo.git'\''
+	EOF
+'
 
 test_expect_success 'rejected update prints status' '
 	cd "$ROOT_PATH"/test_repo_clone &&
@@ -115,59 +128,37 @@ test_expect_success 'rejected update prints status' '
 	git commit -m dev2 &&
 	test_must_fail git push origin dev2 2>act &&
 	sed -e "/^remote: /s/ *$//" <act >cmp &&
-	test_i18ncmp exp cmp
+	test_cmp exp cmp
 '
 rm -f "$HTTPD_DOCUMENT_ROOT_PATH/test_repo.git/hooks/update"
 
-cat >exp <<EOF
-GET  /smart/test_repo.git/info/refs?service=git-upload-pack HTTP/1.1 200
-POST /smart/test_repo.git/git-upload-pack HTTP/1.1 200
-GET  /smart/test_repo.git/info/refs?service=git-receive-pack HTTP/1.1 200
-POST /smart/test_repo.git/git-receive-pack HTTP/1.1 200
-GET  /smart/test_repo.git/info/refs?service=git-receive-pack HTTP/1.1 200
-GET  /smart/test_repo.git/info/refs?service=git-receive-pack HTTP/1.1 200
-POST /smart/test_repo.git/git-receive-pack HTTP/1.1 200
-GET  /smart/test_repo.git/info/refs?service=git-receive-pack HTTP/1.1 200
-POST /smart/test_repo.git/git-receive-pack HTTP/1.1 200
-GET  /smart/test_repo.git/info/refs?service=git-receive-pack HTTP/1.1 200
-POST /smart/test_repo.git/git-receive-pack HTTP/1.1 200
-EOF
-test_expect_success 'used receive-pack service' '
-	# NEEDSWORK: If the overspecification of the expected result is reduced, we
-	# might be able to run this test in all protocol versions.
-	if test "$GIT_TEST_PROTOCOL_VERSION" = 0
-	then
-		check_access_log exp
-	fi
-'
-
 test_http_push_nonff "$HTTPD_DOCUMENT_ROOT_PATH"/test_repo.git \
-	"$ROOT_PATH"/test_repo_clone master 		success
+	"$ROOT_PATH"/test_repo_clone main 		success
 
 test_expect_success 'push fails for non-fast-forward refs unmatched by remote helper' '
 	# create a dissimilarly-named remote ref so that git is unable to match the
 	# two refs (viz. local, remote) unless an explicit refspec is provided.
-	git push origin master:retsam &&
+	git push origin main:niam &&
 
 	echo "change changed" > path2 &&
 	git commit -a -m path2 --amend &&
 
-	# push master too; this ensures there is at least one '"'push'"' command to
+	# push main too; this ensures there is at least one '"'push'"' command to
 	# the remote helper and triggers interaction with the helper.
-	test_must_fail git push -v origin +master master:retsam >output 2>&1'
+	test_must_fail git push -v origin +main main:niam >output 2>&1'
 
 test_expect_success 'push fails for non-fast-forward refs unmatched by remote helper: remote output' '
-	grep "^ + [a-f0-9]*\.\.\.[a-f0-9]* *master -> master (forced update)$" output &&
-	grep "^ ! \[rejected\] *master -> retsam (non-fast-forward)$" output
+	grep "^ + [a-f0-9]*\.\.\.[a-f0-9]* *main -> main (forced update)$" output &&
+	grep "^ ! \[rejected\] *main -> niam (non-fast-forward)$" output
 '
 
 test_expect_success 'push fails for non-fast-forward refs unmatched by remote helper: our output' '
-	test_i18ngrep "Updates were rejected because" \
+	test_grep "Updates were rejected because" \
 		output
 '
 
 test_expect_success 'push (chunked)' '
-	git checkout master &&
+	git checkout main &&
 	test_commit commit path3 &&
 	HEAD=$(git rev-parse --verify HEAD) &&
 	test_config http.postbuffer 4 &&
@@ -177,9 +168,9 @@ test_expect_success 'push (chunked)' '
 	 test $HEAD = $(git rev-parse --verify HEAD))
 '
 
-## References of remote: atomic1(1)            master(2) collateral(2) other(2)
-## References of local :            atomic2(2) master(1) collateral(3) other(2) collateral1(3) atomic(1)
-## Atomic push         :                       master(1) collateral(3)                         atomic(1)
+## References of remote: atomic1(1)            main(2) collateral(2) other(2)
+## References of local :            atomic2(2) main(1) collateral(3) other(2) collateral1(3) atomic(1)
+## Atomic push         :                       main(1) collateral(3)                         atomic(1)
 test_expect_success 'push --atomic also prevents branch creation, reports collateral' '
 	# Setup upstream repo - empty for now
 	d=$HTTPD_DOCUMENT_ROOT_PATH/atomic-branches.git &&
@@ -192,15 +183,15 @@ test_expect_success 'push --atomic also prevents branch creation, reports collat
 	test_commit atomic2 &&
 	git branch collateral &&
 	git branch other &&
-	git push "$up" atomic1 master collateral other &&
+	git push "$up" atomic1 main collateral other &&
 	git tag -d atomic1 &&
 
 	# collateral is a valid push, but should be failed by atomic push
 	git checkout collateral &&
 	test_commit collateral1 &&
 
-	# Make master incompatible with upstream to provoke atomic
-	git checkout master &&
+	# Make main incompatible with upstream to provoke atomic
+	git checkout main &&
 	git reset --hard HEAD^ &&
 
 	# Add a new branch which should be failed by atomic push. This is a
@@ -208,7 +199,7 @@ test_expect_success 'push --atomic also prevents branch creation, reports collat
 	git branch atomic &&
 
 	# --atomic should cause entire push to be rejected
-	test_must_fail git push --atomic "$up" master atomic collateral 2>output &&
+	test_must_fail git push --atomic "$up" main atomic collateral 2>output &&
 
 	# the new branch should not have been created upstream
 	test_must_fail git -C "$d" show-ref --verify refs/heads/atomic &&
@@ -216,15 +207,15 @@ test_expect_success 'push --atomic also prevents branch creation, reports collat
 	# upstream should still reflect atomic2, the last thing we pushed
 	# successfully
 	git rev-parse atomic2 >expected &&
-	# on master...
-	git -C "$d" rev-parse refs/heads/master >actual &&
+	# on main...
+	git -C "$d" rev-parse refs/heads/main >actual &&
 	test_cmp expected actual &&
 	# ...and collateral.
 	git -C "$d" rev-parse refs/heads/collateral >actual &&
 	test_cmp expected actual &&
 
 	# the failed refs should be indicated to the user
-	grep "^ ! .*rejected.* master -> master" output &&
+	grep "^ ! .*rejected.* main -> main" output &&
 
 	# the collateral failure refs should be indicated to the user
 	grep "^ ! .*rejected.* atomic -> atomic .*atomic push failed" output &&
@@ -241,8 +232,9 @@ test_expect_success 'push --atomic fails on server-side errors' '
 	test_config -C "$d" http.receivepack true &&
 	up="$HTTPD_URL"/smart/atomic-branches.git &&
 
-	# break ref updates for other on the remote site
-	mkdir "$d/refs/heads/other.lock" &&
+	# Create d/f conflict to break ref updates for other on the remote site.
+	git -C "$d" update-ref -d refs/heads/other &&
+	git -C "$d" update-ref refs/heads/other/conflict HEAD &&
 
 	# add the new commit to other
 	git branch -f other collateral &&
@@ -250,18 +242,9 @@ test_expect_success 'push --atomic fails on server-side errors' '
 	# --atomic should cause entire push to be rejected
 	test_must_fail git push --atomic "$up" atomic other 2>output  &&
 
-	# the new branch should not have been created upstream
-	test_must_fail git -C "$d" show-ref --verify refs/heads/atomic &&
-
-	# upstream should still reflect atomic2, the last thing we pushed
-	# successfully
-	git rev-parse atomic2 >expected &&
-	# ...to other.
-	git -C "$d" rev-parse refs/heads/other >actual &&
-	test_cmp expected actual &&
-
-	# the new branch should not have been created upstream
+	# The atomic and other branches should not be created upstream.
 	test_must_fail git -C "$d" show-ref --verify refs/heads/atomic &&
+	test_must_fail git -C "$d" show-ref --verify refs/heads/other &&
 
 	# the failed refs should be indicated to the user
 	grep "^ ! .*rejected.* other -> other .*atomic transaction failed" output &&
@@ -306,7 +289,7 @@ test_expect_success TTY 'push shows progress when stderr is a tty' '
 	cd "$ROOT_PATH"/test_repo_clone &&
 	test_commit noisy &&
 	test_terminal git push >output 2>&1 &&
-	test_i18ngrep "^Writing objects" output
+	test_grep "^Writing objects" output
 '
 
 test_expect_success TTY 'push --quiet silences status and progress' '
@@ -320,16 +303,16 @@ test_expect_success TTY 'push --no-progress silences progress but not status' '
 	cd "$ROOT_PATH"/test_repo_clone &&
 	test_commit no-progress &&
 	test_terminal git push --no-progress >output 2>&1 &&
-	test_i18ngrep "^To http" output &&
-	test_i18ngrep ! "^Writing objects" output
+	test_grep "^To http" output &&
+	test_grep ! "^Writing objects" output
 '
 
 test_expect_success 'push --progress shows progress to non-tty' '
 	cd "$ROOT_PATH"/test_repo_clone &&
 	test_commit progress &&
 	git push --progress >output 2>&1 &&
-	test_i18ngrep "^To http" output &&
-	test_i18ngrep "^Writing objects" output
+	test_grep "^To http" output &&
+	test_grep "^Writing objects" output
 '
 
 test_expect_success 'http push gives sane defaults to reflog' '
@@ -416,10 +399,7 @@ test_expect_success CMDLINE_LIMIT 'push 2000 tags over http' '
 '
 
 test_expect_success GPG 'push with post-receive to inspect certificate' '
-	(
-		cd "$HTTPD_DOCUMENT_ROOT_PATH"/test_repo.git &&
-		mkdir -p hooks &&
-		write_script hooks/post-receive <<-\EOF &&
+	test_hook -C "$HTTPD_DOCUMENT_ROOT_PATH"/test_repo.git post-receive <<-\EOF &&
 		# discard the update list
 		cat >/dev/null
 		# record the push certificate
@@ -434,8 +414,9 @@ test_expect_success GPG 'push with post-receive to inspect certificate' '
 		NONCE_STATUS=${GIT_PUSH_CERT_NONCE_STATUS-nononcestatus}
 		NONCE=${GIT_PUSH_CERT_NONCE-nononce}
 		E_O_F
-		EOF
-
+	EOF
+	(
+		cd "$HTTPD_DOCUMENT_ROOT_PATH"/test_repo.git &&
 		git config receive.certnonceseed sekrit &&
 		git config receive.certnonceslop 30
 	) &&
@@ -472,9 +453,9 @@ test_expect_success 'clone/fetch scrubs password from reflogs' '
 	test_commit prepare-for-force-fetch &&
 	git switch -c away &&
 	git fetch "$HTTPD_URL_USER_PASS/smart/test_repo.git" \
-		+master:master &&
+		+main:main &&
 	# should have been scrubbed down to vanilla URL
-	git log -g master >reflog &&
+	git log -g main >reflog &&
 	grep "$HTTPD_URL" reflog &&
 	! grep "$HTTPD_URL_USER_PASS" reflog
 '
@@ -498,12 +479,28 @@ test_expect_success 'colorize errors/hints' '
 	cd "$ROOT_PATH"/test_repo_clone &&
 	test_must_fail git -c color.transport=always -c color.advice=always \
 		-c color.push=always \
-		push origin origin/master^:master 2>act &&
+		push origin origin/main^:main 2>act &&
 	test_decode_color <act >decoded &&
-	test_i18ngrep "<RED>.*rejected.*<RESET>" decoded &&
-	test_i18ngrep "<RED>error: failed to push some refs" decoded &&
-	test_i18ngrep "<YELLOW>hint: " decoded &&
-	test_i18ngrep ! "^hint: " decoded
+	test_grep "<RED>.*rejected.*<RESET>" decoded &&
+	test_grep "<RED>error: failed to push some refs" decoded &&
+	test_grep "<YELLOW>hint: " decoded &&
+	test_grep ! "^hint: " decoded
+'
+
+test_expect_success 'report error server does not provide ref status' '
+	git init "$HTTPD_DOCUMENT_ROOT_PATH/no_report" &&
+	git -C "$HTTPD_DOCUMENT_ROOT_PATH/no_report" config http.receivepack true &&
+	test_must_fail git push --porcelain \
+		$HTTPD_URL_USER_PASS/smart/no_report \
+		HEAD:refs/tags/will-fail >actual &&
+	test_must_fail git -C "$HTTPD_DOCUMENT_ROOT_PATH/no_report" \
+		rev-parse --verify refs/tags/will-fail &&
+	cat >expect <<-EOF &&
+	To $HTTPD_URL/smart/no_report
+	!	HEAD:refs/tags/will-fail	[remote failure] (remote failed to report status)
+	Done
+	EOF
+	test_cmp expect actual
 '
 
 test_done
diff --git a/t/t5542-push-http-shallow.sh b/t/t5542-push-http-shallow.sh
index ddc1db7..c2cc831 100755
--- a/t/t5542-push-http-shallow.sh
+++ b/t/t5542-push-http-shallow.sh
@@ -2,6 +2,9 @@
 
 test_description='push from/to a shallow clone over http'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-httpd.sh
 start_httpd
@@ -51,12 +54,12 @@ test_expect_success 'push to shallow repo via http' '
 	(
 	cd full &&
 	commit 9 &&
-	git push $HTTPD_URL/smart/repo.git +master:refs/remotes/top/master
+	git push $HTTPD_URL/smart/repo.git +main:refs/remotes/top/main
 	) &&
 	(
 	cd "$HTTPD_DOCUMENT_ROOT_PATH/repo.git" &&
 	git fsck &&
-	git log --format=%s top/master >actual &&
+	git log --format=%s top/main >actual &&
 	cat <<EOF >expect &&
 9
 4
@@ -74,11 +77,11 @@ test_expect_success 'push from shallow repo via http' '
 	git config http.receivepack true
 	) &&
 	commit 10 &&
-	git push $HTTPD_URL/smart/repo.git +master:refs/remotes/top/master &&
+	git push $HTTPD_URL/smart/repo.git +main:refs/remotes/top/main &&
 	(
 	cd "$HTTPD_DOCUMENT_ROOT_PATH/repo.git" &&
 	git fsck &&
-	git log --format=%s top/master >actual &&
+	git log --format=%s top/main >actual &&
 	cat <<EOF >expect &&
 10
 4
diff --git a/t/t5543-atomic-push.sh b/t/t5543-atomic-push.sh
index 620c30d..04b47ad 100755
--- a/t/t5543-atomic-push.sh
+++ b/t/t5543-atomic-push.sh
@@ -2,6 +2,9 @@
 
 test_description='pushing to a repository using the atomic push option'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 mk_repo_pair () {
@@ -40,9 +43,9 @@ test_expect_success 'atomic push works for a single branch' '
 		test_commit one &&
 		git push --mirror up &&
 		test_commit two &&
-		git push --atomic up master
+		git push --atomic up main
 	) &&
-	test_refs master master
+	test_refs main main
 '
 
 test_expect_success 'atomic push works for two branches' '
@@ -55,9 +58,9 @@ test_expect_success 'atomic push works for two branches' '
 		test_commit two &&
 		git checkout second &&
 		test_commit three &&
-		git push --atomic up master second
+		git push --atomic up main second
 	) &&
-	test_refs master master &&
+	test_refs main main &&
 	test_refs second second
 '
 
@@ -70,7 +73,7 @@ test_expect_success 'atomic push works in combination with --mirror' '
 		test_commit two &&
 		git push --atomic --mirror up
 	) &&
-	test_refs master master &&
+	test_refs main main &&
 	test_refs second second
 '
 
@@ -79,7 +82,7 @@ test_expect_success 'atomic push works in combination with --force' '
 	(
 		cd workbench &&
 		test_commit one &&
-		git branch second master &&
+		git branch second main &&
 		test_commit two_a &&
 		git checkout second &&
 		test_commit two_b &&
@@ -87,36 +90,39 @@ test_expect_success 'atomic push works in combination with --force' '
 		test_commit four &&
 		git push --mirror up &&
 		# The actual test is below
-		git checkout master &&
+		git checkout main &&
 		test_commit three_a &&
 		git checkout second &&
 		git reset --hard HEAD^ &&
-		git push --force --atomic up master second
+		git push --force --atomic up main second
 	) &&
-	test_refs master master &&
+	test_refs main main &&
 	test_refs second second
 '
 
-# set up two branches where master can be pushed but second can not
+# set up two branches where main can be pushed but second can not
 # (non-fast-forward). Since second can not be pushed the whole operation
-# will fail and leave master untouched.
+# will fail and leave main untouched.
 test_expect_success 'atomic push fails if one branch fails' '
 	mk_repo_pair &&
 	(
 		cd workbench &&
 		test_commit one &&
-		git checkout -b second master &&
+		git checkout -b second main &&
 		test_commit two &&
 		test_commit three &&
 		test_commit four &&
 		git push --mirror up &&
 		git reset --hard HEAD~2 &&
 		test_commit five &&
-		git checkout master &&
+		git checkout main &&
 		test_commit six &&
-		test_must_fail git push --atomic --all up
+		test_must_fail git push --atomic --all up >output-all 2>&1 &&
+		# --all and --branches have the same behavior when be combined with --atomic
+		test_must_fail git push --atomic --branches up >output-branches 2>&1 &&
+		test_cmp output-all output-branches
 	) &&
-	test_refs master HEAD@{7} &&
+	test_refs main HEAD@{7} &&
 	test_refs second HEAD@{4}
 '
 
@@ -126,7 +132,7 @@ test_expect_success 'atomic push fails if one tag fails remotely' '
 	(
 		cd workbench &&
 		test_commit one &&
-		git checkout -b second master &&
+		git checkout -b second main &&
 		test_commit two &&
 		git push --mirror up
 	) &&
@@ -139,14 +145,14 @@ test_expect_success 'atomic push fails if one tag fails remotely' '
 	# see if we can now push both branches.
 	(
 		cd workbench &&
-		git checkout master &&
+		git checkout main &&
 		test_commit three &&
 		git checkout second &&
 		test_commit four &&
 		git tag test_tag &&
-		test_must_fail git push --tags --atomic up master second
+		test_must_fail git push --tags --atomic up main second
 	) &&
-	test_refs master HEAD@{3} &&
+	test_refs main HEAD@{3} &&
 	test_refs second HEAD@{1}
 '
 
@@ -155,29 +161,23 @@ test_expect_success 'atomic push obeys update hook preventing a branch to be pus
 	(
 		cd workbench &&
 		test_commit one &&
-		git checkout -b second master &&
+		git checkout -b second main &&
 		test_commit two &&
 		git push --mirror up
 	) &&
-	(
-		cd upstream &&
-		HOOKDIR="$(git rev-parse --git-dir)/hooks" &&
-		HOOK="$HOOKDIR/update" &&
-		mkdir -p "$HOOKDIR" &&
-		write_script "$HOOK" <<-\EOF
-			# only allow update to master from now on
-			test "$1" = "refs/heads/master"
-		EOF
-	) &&
+	test_hook -C upstream update <<-\EOF &&
+	# only allow update to main from now on
+	test "$1" = "refs/heads/main"
+	EOF
 	(
 		cd workbench &&
-		git checkout master &&
+		git checkout main &&
 		test_commit three &&
 		git checkout second &&
 		test_commit four &&
-		test_must_fail git push --atomic up master second
+		test_must_fail git push --atomic up main second
 	) &&
-	test_refs master HEAD@{3} &&
+	test_refs main HEAD@{3} &&
 	test_refs second HEAD@{1}
 '
 
@@ -192,21 +192,21 @@ test_expect_success 'atomic push is not advertised if configured' '
 		test_commit one &&
 		git push --mirror up &&
 		test_commit two &&
-		test_must_fail git push --atomic up master
+		test_must_fail git push --atomic up main
 	) &&
-	test_refs master HEAD@{1}
+	test_refs main HEAD@{1}
 '
 
-# References in upstream : master(1) one(1) foo(1)
-# References in workbench: master(2)        foo(1) two(2) bar(2)
-# Atomic push            : master(2)               two(2) bar(2)
+# References in upstream : main(1) one(1) foo(1)
+# References in workbench: main(2)        foo(1) two(2) bar(2)
+# Atomic push            : main(2)               two(2) bar(2)
 test_expect_success 'atomic push reports (reject by update hook)' '
 	mk_repo_pair &&
 	(
 		cd workbench &&
 		test_commit one &&
 		git branch foo &&
-		git push up master one foo &&
+		git push up main one foo &&
 		git tag -d one
 	) &&
 	(
@@ -228,19 +228,19 @@ test_expect_success 'atomic push reports (reject by update hook)' '
 		git branch bar
 	) &&
 	test_must_fail git -C workbench \
-		push --atomic up master two bar >out 2>&1 &&
+		push --atomic up main two bar >out 2>&1 &&
 	fmt_status_report <out >actual &&
 	cat >expect <<-EOF &&
 	To ../upstream
-	 ! [remote rejected] master -> master (atomic push failure)
+	 ! [remote rejected] main -> main (atomic push failure)
 	 ! [remote rejected] two -> two (atomic push failure)
 	 ! [remote rejected] bar -> bar (hook declined)
 	EOF
 	test_cmp expect actual
 '
 
-# References in upstream : master(1) one(1) foo(1)
-# References in workbench: master(2)        foo(1) two(2) bar(2)
+# References in upstream : main(1) one(1) foo(1)
+# References in workbench: main(2)        foo(1) two(2) bar(2)
 test_expect_success 'atomic push reports (mirror, but reject by update hook)' '
 	(
 		cd workbench &&
@@ -252,7 +252,7 @@ test_expect_success 'atomic push reports (mirror, but reject by update hook)' '
 	fmt_status_report <out >actual &&
 	cat >expect <<-EOF &&
 	To ../upstream
-	 ! [remote rejected] master -> master (atomic push failure)
+	 ! [remote rejected] main -> main (atomic push failure)
 	 ! [remote rejected] one (atomic push failure)
 	 ! [remote rejected] bar -> bar (hook declined)
 	 ! [remote rejected] two -> two (atomic push failure)
@@ -260,21 +260,21 @@ test_expect_success 'atomic push reports (mirror, but reject by update hook)' '
 	test_cmp expect actual
 '
 
-# References in upstream : master(2) one(1) foo(1)
-# References in workbench: master(1)        foo(1) two(2) bar(2)
+# References in upstream : main(2) one(1) foo(1)
+# References in workbench: main(1)        foo(1) two(2) bar(2)
 test_expect_success 'atomic push reports (reject by non-ff)' '
 	rm upstream/.git/hooks/update &&
 	(
 		cd workbench &&
-		git push up master &&
+		git push up main &&
 		git reset --hard HEAD^
 	) &&
 	test_must_fail git -C workbench \
-		push --atomic up master foo bar >out 2>&1 &&
+		push --atomic up main foo bar >out 2>&1 &&
 	fmt_status_report <out >actual &&
 	cat >expect <<-EOF &&
 	To ../upstream
-	 ! [rejected] master -> master (non-fast-forward)
+	 ! [rejected] main -> main (non-fast-forward)
 	 ! [rejected] bar -> bar (atomic push failed)
 	EOF
 	test_cmp expect actual
diff --git a/t/t5544-pack-objects-hook.sh b/t/t5544-pack-objects-hook.sh
index 4357af1..1a9e14b 100755
--- a/t/t5544-pack-objects-hook.sh
+++ b/t/t5544-pack-objects-hook.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='test custom script in place of pack-objects'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'create some history to fetch' '
@@ -56,7 +58,22 @@ test_expect_success 'hook does not run from repo config' '
 	! grep "hook running" stderr &&
 	test_path_is_missing .git/hook.args &&
 	test_path_is_missing .git/hook.stdin &&
-	test_path_is_missing .git/hook.stdout
+	test_path_is_missing .git/hook.stdout &&
+
+	# check that global config is used instead
+	test_config_global uploadpack.packObjectsHook ./hook &&
+	git clone --no-local . dst2.git 2>stderr &&
+	grep "hook running" stderr
+'
+
+test_expect_success 'hook works with partial clone' '
+	clear_hook_results &&
+	test_config_global uploadpack.packObjectsHook ./hook &&
+	test_config_global uploadpack.allowFilter true &&
+	git clone --bare --no-local --filter=blob:none . dst.git &&
+	git -C dst.git rev-list --objects --missing=allow-any --no-object-names --all >objects &&
+	git -C dst.git cat-file --batch-check="%(objecttype)" <objects >types &&
+	! grep blob types
 '
 
 test_done
diff --git a/t/t5545-push-options.sh b/t/t5545-push-options.sh
index 38e6f73..fb13549 100755
--- a/t/t5545-push-options.sh
+++ b/t/t5545-push-options.sh
@@ -2,6 +2,12 @@
 
 test_description='pushing to a repository using push options'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+GIT_TEST_FATAL_REGISTER_SUBMODULE_ODB=1
+export GIT_TEST_FATAL_REGISTER_SUBMODULE_ODB
+
 . ./test-lib.sh
 
 mk_repo_pair () {
@@ -63,9 +69,9 @@ test_expect_success 'one push option works for a single branch' '
 		test_commit one &&
 		git push --mirror up &&
 		test_commit two &&
-		git push --push-option=asdf up master
+		git push --push-option=asdf up main
 	) &&
-	test_refs master master &&
+	test_refs main main &&
 	echo "asdf" >expect &&
 	test_cmp expect upstream/.git/hooks/pre-receive.push_options &&
 	test_cmp expect upstream/.git/hooks/post-receive.push_options
@@ -79,9 +85,9 @@ test_expect_success 'push option denied by remote' '
 		test_commit one &&
 		git push --mirror up &&
 		test_commit two &&
-		test_must_fail git push --push-option=asdf up master
+		test_must_fail git push --push-option=asdf up main
 	) &&
-	test_refs master HEAD@{1}
+	test_refs main HEAD@{1}
 '
 
 test_expect_success 'two push options work' '
@@ -92,9 +98,9 @@ test_expect_success 'two push options work' '
 		test_commit one &&
 		git push --mirror up &&
 		test_commit two &&
-		git push --push-option=asdf --push-option="more structured text" up master
+		git push --push-option=asdf --push-option="more structured text" up main
 	) &&
-	test_refs master master &&
+	test_refs main main &&
 	printf "asdf\nmore structured text\n" >expect &&
 	test_cmp expect upstream/.git/hooks/pre-receive.push_options &&
 	test_cmp expect upstream/.git/hooks/post-receive.push_options
@@ -113,6 +119,7 @@ test_expect_success 'push options and submodules' '
 	test_commit -C parent one &&
 	git -C parent push --mirror up &&
 
+	test_config_global protocol.file.allow always &&
 	git -C parent submodule add ../upstream workbench &&
 	git -C parent/workbench remote add up ../../upstream &&
 	git -C parent commit -m "add submodule" &&
@@ -123,14 +130,14 @@ test_expect_success 'push options and submodules' '
 
 	git -C parent push \
 		--push-option=asdf --push-option="more structured text" \
-		--recurse-submodules=on-demand up master &&
+		--recurse-submodules=on-demand up main &&
 
-	git -C upstream rev-parse --verify master >expect &&
-	git -C parent/workbench rev-parse --verify master >actual &&
+	git -C upstream rev-parse --verify main >expect &&
+	git -C parent/workbench rev-parse --verify main >actual &&
 	test_cmp expect actual &&
 
-	git -C parent_upstream rev-parse --verify master >expect &&
-	git -C parent rev-parse --verify master >actual &&
+	git -C parent_upstream rev-parse --verify main >expect &&
+	git -C parent rev-parse --verify main >actual &&
 	test_cmp expect actual &&
 
 	printf "asdf\nmore structured text\n" >expect &&
@@ -148,9 +155,9 @@ test_expect_success 'default push option' '
 		test_commit one &&
 		git push --mirror up &&
 		test_commit two &&
-		git -c push.pushOption=default push up master
+		git -c push.pushOption=default push up main
 	) &&
-	test_refs master master &&
+	test_refs main main &&
 	echo "default" >expect &&
 	test_cmp expect upstream/.git/hooks/pre-receive.push_options &&
 	test_cmp expect upstream/.git/hooks/post-receive.push_options
@@ -164,9 +171,9 @@ test_expect_success 'two default push options' '
 		test_commit one &&
 		git push --mirror up &&
 		test_commit two &&
-		git -c push.pushOption=default1 -c push.pushOption=default2 push up master
+		git -c push.pushOption=default1 -c push.pushOption=default2 push up main
 	) &&
-	test_refs master master &&
+	test_refs main main &&
 	printf "default1\ndefault2\n" >expect &&
 	test_cmp expect upstream/.git/hooks/pre-receive.push_options &&
 	test_cmp expect upstream/.git/hooks/post-receive.push_options
@@ -180,9 +187,9 @@ test_expect_success 'push option from command line overrides from-config push op
 		test_commit one &&
 		git push --mirror up &&
 		test_commit two &&
-		git -c push.pushOption=default push --push-option=manual up master
+		git -c push.pushOption=default push --push-option=manual up main
 	) &&
-	test_refs master master &&
+	test_refs main main &&
 	echo "manual" >expect &&
 	test_cmp expect upstream/.git/hooks/pre-receive.push_options &&
 	test_cmp expect upstream/.git/hooks/post-receive.push_options
@@ -196,9 +203,9 @@ test_expect_success 'empty value of push.pushOption in config clears the list' '
 		test_commit one &&
 		git push --mirror up &&
 		test_commit two &&
-		git -c push.pushOption=default1 -c push.pushOption= -c push.pushOption=default2 push up master
+		git -c push.pushOption=default1 -c push.pushOption= -c push.pushOption=default2 push up main
 	) &&
-	test_refs master master &&
+	test_refs main main &&
 	echo "default2" >expect &&
 	test_cmp expect upstream/.git/hooks/pre-receive.push_options &&
 	test_cmp expect upstream/.git/hooks/post-receive.push_options
@@ -212,16 +219,16 @@ test_expect_success 'invalid push option in config' '
 		test_commit one &&
 		git push --mirror up &&
 		test_commit two &&
-		test_must_fail git -c push.pushOption push up master
+		test_must_fail git -c push.pushOption push up main
 	) &&
-	test_refs master HEAD@{1}
+	test_refs main HEAD@{1}
 '
 
 test_expect_success 'push options keep quoted characters intact (direct)' '
 	mk_repo_pair &&
 	git -C upstream config receive.advertisePushOptions true &&
 	test_commit -C workbench one &&
-	git -C workbench push --push-option="\"embedded quotes\"" up master &&
+	git -C workbench push --push-option="\"embedded quotes\"" up main &&
 	echo "\"embedded quotes\"" >expect &&
 	test_cmp expect upstream/.git/hooks/pre-receive.push_options
 '
@@ -244,28 +251,28 @@ mk_http_pair () {
 test_expect_success 'push option denied properly by http server' '
 	mk_http_pair false &&
 	test_commit -C test_http_clone one &&
-	test_must_fail git -C test_http_clone push --push-option=asdf origin master 2>actual &&
-	test_i18ngrep "the receiving end does not support push options" actual &&
-	git -C test_http_clone push origin master
+	test_must_fail git -C test_http_clone push --push-option=asdf origin main 2>actual &&
+	test_grep "the receiving end does not support push options" actual &&
+	git -C test_http_clone push origin main
 '
 
 test_expect_success 'push options work properly across http' '
 	mk_http_pair true &&
 
 	test_commit -C test_http_clone one &&
-	git -C test_http_clone push origin master &&
-	git -C "$HTTPD_DOCUMENT_ROOT_PATH"/upstream.git rev-parse --verify master >expect &&
-	git -C test_http_clone rev-parse --verify master >actual &&
+	git -C test_http_clone push origin main &&
+	git -C "$HTTPD_DOCUMENT_ROOT_PATH"/upstream.git rev-parse --verify main >expect &&
+	git -C test_http_clone rev-parse --verify main >actual &&
 	test_cmp expect actual &&
 
 	test_commit -C test_http_clone two &&
-	git -C test_http_clone push --push-option=asdf --push-option="more structured text" origin master &&
+	git -C test_http_clone push --push-option=asdf --push-option="more structured text" origin main &&
 	printf "asdf\nmore structured text\n" >expect &&
 	test_cmp expect "$HTTPD_DOCUMENT_ROOT_PATH"/upstream.git/hooks/pre-receive.push_options &&
 	test_cmp expect "$HTTPD_DOCUMENT_ROOT_PATH"/upstream.git/hooks/post-receive.push_options &&
 
-	git -C "$HTTPD_DOCUMENT_ROOT_PATH"/upstream.git rev-parse --verify master >expect &&
-	git -C test_http_clone rev-parse --verify master >actual &&
+	git -C "$HTTPD_DOCUMENT_ROOT_PATH"/upstream.git rev-parse --verify main >expect &&
+	git -C test_http_clone rev-parse --verify main >actual &&
 	test_cmp expect actual
 '
 
@@ -273,7 +280,7 @@ test_expect_success 'push options keep quoted characters intact (http)' '
 	mk_http_pair true &&
 
 	test_commit -C test_http_clone one &&
-	git -C test_http_clone push --push-option="\"embedded quotes\"" origin master &&
+	git -C test_http_clone push --push-option="\"embedded quotes\"" origin main &&
 	echo "\"embedded quotes\"" >expect &&
 	test_cmp expect "$HTTPD_DOCUMENT_ROOT_PATH"/upstream.git/hooks/pre-receive.push_options
 '
diff --git a/t/t5546-receive-limits.sh b/t/t5546-receive-limits.sh
index 0b0e987..9fc9ba5 100755
--- a/t/t5546-receive-limits.sh
+++ b/t/t5546-receive-limits.sh
@@ -1,16 +1,34 @@
 #!/bin/sh
 
 test_description='check receive input limits'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # Let's run tests with different unpack limits: 1 and 10000
 # When the limit is 1, `git receive-pack` will call `git index-pack`.
 # When the limit is 10000, `git receive-pack` will call `git unpack-objects`.
 
+validate_store_type () {
+	git -C dest count-objects -v >actual &&
+	case "$store_type" in
+	index)
+		grep "^count: 0$" actual ;;
+	unpack)
+		grep "^packs: 0$" actual ;;
+	esac || {
+		echo "store_type is $store_type"
+		cat actual
+		false;
+	}
+}
+
 test_pack_input_limit () {
-	case "$1" in
-	index) unpack_limit=1 ;;
-	unpack) unpack_limit=10000 ;;
+	store_type=$1
+
+	case "$store_type" in
+	index) unpack_limit=1 other_limit=10000 ;;
+	unpack) unpack_limit=10000 other_limit=1 ;;
 	esac
 
 	test_expect_success 'prepare destination repository' '
@@ -41,6 +59,19 @@ test_pack_input_limit () {
 		git --git-dir=dest config receive.maxInputSize 0 &&
 		git push dest HEAD
 	'
+
+	test_expect_success 'prepare destination repository (once more)' '
+		rm -fr dest &&
+		git --bare init dest
+	'
+
+	test_expect_success 'receive trumps transfer' '
+		git --git-dir=dest config receive.unpacklimit "$unpack_limit" &&
+		git --git-dir=dest config transfer.unpacklimit "$other_limit" &&
+		git push dest HEAD &&
+		validate_store_type
+	'
+
 }
 
 test_expect_success "create known-size (1024 bytes) commit" '
diff --git a/t/t5547-push-quarantine.sh b/t/t5547-push-quarantine.sh
index faaa51c..9f899b8 100755
--- a/t/t5547-push-quarantine.sh
+++ b/t/t5547-push-quarantine.sh
@@ -1,11 +1,13 @@
 #!/bin/sh
 
 test_description='check quarantine of objects during push'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'create picky dest repo' '
 	git init --bare dest.git &&
-	write_script dest.git/hooks/pre-receive <<-\EOF
+	test_hook --setup -C dest.git pre-receive <<-\EOF
 	while read old new ref; do
 		test "$(git log -1 --format=%s $new)" = reject && exit 1
 	done
@@ -60,7 +62,7 @@ test_expect_success 'push to repo path with path separator (colon)' '
 
 test_expect_success 'updating a ref from quarantine is forbidden' '
 	git init --bare update.git &&
-	write_script update.git/hooks/pre-receive <<-\EOF &&
+	test_hook -C update.git pre-receive <<-\EOF &&
 	read old new refname
 	git update-ref refs/heads/unrelated $new
 	exit 1
diff --git a/t/t5548-push-porcelain.sh b/t/t5548-push-porcelain.sh
index 1b19b3e..6282728 100755
--- a/t/t5548-push-porcelain.sh
+++ b/t/t5548-push-porcelain.sh
@@ -14,29 +14,28 @@ test_description='Test git push porcelain output'
 # NOTE: Never calling this function from a subshell since variable
 # assignments will disappear when subshell exits.
 create_commits_in () {
-	repo="$1" &&
-	if ! parent=$(git -C "$repo" rev-parse HEAD^{} --)
-	then
-		parent=
-	fi &&
-	T=$(git -C "$repo" write-tree) &&
+	repo="$1" && test -d "$repo" ||
+	error "Repository $repo does not exist."
 	shift &&
 	while test $# -gt 0
 	do
 		name=$1 &&
-		test_tick &&
-		if test -z "$parent"
-		then
-			oid=$(echo $name | git -C "$repo" commit-tree $T)
-		else
-			oid=$(echo $name | git -C "$repo" commit-tree -p $parent $T)
-		fi &&
-		eval $name=$oid &&
-		parent=$oid &&
-		shift ||
-		return 1
-	done &&
-	git -C "$repo" update-ref refs/heads/master $oid
+		shift &&
+		test_commit -C "$repo" --no-tag "$name" &&
+		eval $name=$(git -C "$repo" rev-parse HEAD)
+	done
+}
+
+get_abbrev_oid () {
+	oid=$1 &&
+	suffix=${oid#???????} &&
+	oid=${oid%$suffix} &&
+	if test -n "$oid"
+	then
+		echo "$oid"
+	else
+		echo "undefined-oid"
+	fi
 }
 
 # Format the output of git-push, git-show-ref and other commands to make a
@@ -45,20 +44,19 @@ create_commits_in () {
 # of the output.
 make_user_friendly_and_stable_output () {
 	sed \
-		-e "s/  *\$//" \
-		-e "s/   */ /g" \
-		-e "s/	/    /g" \
-		-e "s/$A/<COMMIT-A>/g" \
-		-e "s/$B/<COMMIT-B>/g" \
+		-e "s/$(get_abbrev_oid $A)[0-9a-f]*/<COMMIT-A>/g" \
+		-e "s/$(get_abbrev_oid $B)[0-9a-f]*/<COMMIT-B>/g" \
 		-e "s/$ZERO_OID/<ZERO-OID>/g" \
-		-e "s/$(echo $A | cut -c1-7)[0-9a-f]*/<OID-A>/g" \
-		-e "s/$(echo $B | cut -c1-7)[0-9a-f]*/<OID-B>/g" \
 		-e "s#To $URL_PREFIX/upstream.git#To <URL/of/upstream.git>#"
 }
 
+format_and_save_expect () {
+	sed -e 's/^> //' -e 's/Z$//' >expect
+}
+
 setup_upstream_and_workbench () {
-	# Upstream  after setup : master(B)  foo(A)  bar(A)  baz(A)
-	# Workbench after setup : master(A)
+	# Upstream  after setup : main(B)  foo(A)  bar(A)  baz(A)
+	# Workbench after setup : main(A)
 	test_expect_success "setup upstream repository and workbench" '
 		rm -rf upstream.git workbench &&
 		git init --bare upstream.git &&
@@ -70,9 +68,9 @@ setup_upstream_and_workbench () {
 			# this fixed-width oid will be replaced with "<OID>".
 			git config core.abbrev 7 &&
 			git remote add origin ../upstream.git &&
-			git update-ref refs/heads/master $A &&
+			git update-ref refs/heads/main $A &&
 			git push origin \
-				$B:refs/heads/master \
+				$B:refs/heads/main \
 				$A:refs/heads/foo \
 				$A:refs/heads/bar \
 				$A:refs/heads/baz
@@ -94,31 +92,31 @@ run_git_push_porcelain_output_test() {
 		;;
 	esac
 
-	# Refs of upstream : master(B)  foo(A)  bar(A)  baz(A)
-	# Refs of workbench: master(A)                  baz(A)  next(A)
-	# git-push         : master(A)  NULL    (B)     baz(A)  next(A)
+	# Refs of upstream : main(B)  foo(A)  bar(A)  baz(A)
+	# Refs of workbench: main(A)                  baz(A)  next(A)
+	# git-push         : main(A)  NULL    (B)     baz(A)  next(A)
 	test_expect_success "porcelain output of successful git-push ($PROTOCOL)" '
 		(
 			cd workbench &&
-			git update-ref refs/heads/master $A &&
+			git update-ref refs/heads/main $A &&
 			git update-ref refs/heads/baz $A &&
 			git update-ref refs/heads/next $A &&
 			git push --porcelain --force origin \
-				master \
+				main \
 				:refs/heads/foo \
 				$B:bar \
 				baz \
 				next
 		) >out &&
 		make_user_friendly_and_stable_output <out >actual &&
-		cat >expect <<-EOF &&
-		To <URL/of/upstream.git>
-		=    refs/heads/baz:refs/heads/baz    [up to date]
-		     <COMMIT-B>:refs/heads/bar    <OID-A>..<OID-B>
-		-    :refs/heads/foo    [deleted]
-		+    refs/heads/master:refs/heads/master    <OID-B>...<OID-A> (forced update)
-		*    refs/heads/next:refs/heads/next    [new branch]
-		Done
+		format_and_save_expect <<-EOF &&
+		> To <URL/of/upstream.git>
+		> =	refs/heads/baz:refs/heads/baz	[up to date]
+		>  	<COMMIT-B>:refs/heads/bar	<COMMIT-A>..<COMMIT-B>
+		> -	:refs/heads/foo	[deleted]
+		> +	refs/heads/main:refs/heads/main	<COMMIT-B>...<COMMIT-A> (forced update)
+		> *	refs/heads/next:refs/heads/next	[new branch]
+		> Done
 		EOF
 		test_cmp expect actual &&
 
@@ -127,33 +125,33 @@ run_git_push_porcelain_output_test() {
 		cat >expect <<-EOF &&
 		<COMMIT-B> refs/heads/bar
 		<COMMIT-A> refs/heads/baz
-		<COMMIT-A> refs/heads/master
+		<COMMIT-A> refs/heads/main
 		<COMMIT-A> refs/heads/next
 		EOF
 		test_cmp expect actual
 	'
 
-	# Refs of upstream : master(A)  bar(B)  baz(A)  next(A)
-	# Refs of workbench: master(B)  bar(A)  baz(A)  next(A)
-	# git-push         : master(B)  bar(A)  NULL    next(A)
+	# Refs of upstream : main(A)  bar(B)  baz(A)  next(A)
+	# Refs of workbench: main(B)  bar(A)  baz(A)  next(A)
+	# git-push         : main(B)  bar(A)  NULL    next(A)
 	test_expect_success "atomic push failed ($PROTOCOL)" '
 		(
 			cd workbench &&
-			git update-ref refs/heads/master $B &&
+			git update-ref refs/heads/main $B &&
 			git update-ref refs/heads/bar $A &&
 			test_must_fail git push --atomic --porcelain origin \
-				master \
+				main \
 				bar \
 				:baz \
 				next
 		) >out &&
 		make_user_friendly_and_stable_output <out >actual &&
-		cat >expect <<-EOF &&
+		format_and_save_expect <<-EOF &&
 		To <URL/of/upstream.git>
-		=    refs/heads/next:refs/heads/next    [up to date]
-		!    refs/heads/bar:refs/heads/bar    [rejected] (non-fast-forward)
-		!    (delete):refs/heads/baz    [rejected] (atomic push failed)
-		!    refs/heads/master:refs/heads/master    [rejected] (atomic push failed)
+		> =	refs/heads/next:refs/heads/next	[up to date]
+		> !	refs/heads/bar:refs/heads/bar	[rejected] (non-fast-forward)
+		> !	(delete):refs/heads/baz	[rejected] (atomic push failed)
+		> !	refs/heads/main:refs/heads/main	[rejected] (atomic push failed)
 		Done
 		EOF
 		test_cmp expect actual &&
@@ -163,38 +161,39 @@ run_git_push_porcelain_output_test() {
 		cat >expect <<-EOF &&
 		<COMMIT-B> refs/heads/bar
 		<COMMIT-A> refs/heads/baz
-		<COMMIT-A> refs/heads/master
+		<COMMIT-A> refs/heads/main
 		<COMMIT-A> refs/heads/next
 		EOF
 		test_cmp expect actual
 	'
+
 	test_expect_success "prepare pre-receive hook ($PROTOCOL)" '
-		write_script "$upstream/hooks/pre-receive" <<-EOF
+		test_hook --setup -C "$upstream" pre-receive <<-EOF
 		exit 1
 		EOF
 	'
 
-	# Refs of upstream : master(A)  bar(B)  baz(A)  next(A)
-	# Refs of workbench: master(B)  bar(A)  baz(A)  next(A)
-	# git-push         : master(B)  bar(A)  NULL    next(A)
+	# Refs of upstream : main(A)  bar(B)  baz(A)  next(A)
+	# Refs of workbench: main(B)  bar(A)  baz(A)  next(A)
+	# git-push         : main(B)  bar(A)  NULL    next(A)
 	test_expect_success "pre-receive hook declined ($PROTOCOL)" '
 		(
 			cd workbench &&
-			git update-ref refs/heads/master $B &&
+			git update-ref refs/heads/main $B &&
 			git update-ref refs/heads/bar $A &&
 			test_must_fail git push --porcelain --force origin \
-				master \
+				main \
 				bar \
 				:baz \
 				next
 		) >out &&
 		make_user_friendly_and_stable_output <out >actual &&
-		cat >expect <<-EOF &&
+		format_and_save_expect <<-EOF &&
 		To <URL/of/upstream.git>
-		=    refs/heads/next:refs/heads/next    [up to date]
-		!    refs/heads/bar:refs/heads/bar    [remote rejected] (pre-receive hook declined)
-		!    :refs/heads/baz    [remote rejected] (pre-receive hook declined)
-		!    refs/heads/master:refs/heads/master    [remote rejected] (pre-receive hook declined)
+		> =	refs/heads/next:refs/heads/next	[up to date]
+		> !	refs/heads/bar:refs/heads/bar	[remote rejected] (pre-receive hook declined)
+		> !	:refs/heads/baz	[remote rejected] (pre-receive hook declined)
+		> !	refs/heads/main:refs/heads/main	[remote rejected] (pre-receive hook declined)
 		Done
 		EOF
 		test_cmp expect actual &&
@@ -204,7 +203,7 @@ run_git_push_porcelain_output_test() {
 		cat >expect <<-EOF &&
 		<COMMIT-B> refs/heads/bar
 		<COMMIT-A> refs/heads/baz
-		<COMMIT-A> refs/heads/master
+		<COMMIT-A> refs/heads/main
 		<COMMIT-A> refs/heads/next
 		EOF
 		test_cmp expect actual
@@ -214,25 +213,25 @@ run_git_push_porcelain_output_test() {
 		rm "$upstream/hooks/pre-receive"
 	'
 
-	# Refs of upstream : master(A)  bar(B)  baz(A)  next(A)
-	# Refs of workbench: master(B)  bar(A)  baz(A)  next(A)
-	# git-push         : master(B)  bar(A)  NULL    next(A)
+	# Refs of upstream : main(A)  bar(B)  baz(A)  next(A)
+	# Refs of workbench: main(B)  bar(A)  baz(A)  next(A)
+	# git-push         : main(B)  bar(A)  NULL    next(A)
 	test_expect_success "non-fastforward push ($PROTOCOL)" '
 		(
 			cd workbench &&
 			test_must_fail git push --porcelain origin \
-				master \
+				main \
 				bar \
 				:baz \
 				next
 		) >out &&
 		make_user_friendly_and_stable_output <out >actual &&
-		cat >expect <<-EOF &&
+		format_and_save_expect <<-EOF &&
 		To <URL/of/upstream.git>
-		=    refs/heads/next:refs/heads/next    [up to date]
-		-    :refs/heads/baz    [deleted]
-		     refs/heads/master:refs/heads/master    <OID-A>..<OID-B>
-		!    refs/heads/bar:refs/heads/bar    [rejected] (non-fast-forward)
+		> =	refs/heads/next:refs/heads/next	[up to date]
+		> -	:refs/heads/baz	[deleted]
+		>  	refs/heads/main:refs/heads/main	<COMMIT-A>..<COMMIT-B>
+		> !	refs/heads/bar:refs/heads/bar	[rejected] (non-fast-forward)
 		Done
 		EOF
 		test_cmp expect actual &&
@@ -241,7 +240,7 @@ run_git_push_porcelain_output_test() {
 		make_user_friendly_and_stable_output <out >actual &&
 		cat >expect <<-EOF &&
 		<COMMIT-B> refs/heads/bar
-		<COMMIT-B> refs/heads/master
+		<COMMIT-B> refs/heads/main
 		<COMMIT-A> refs/heads/next
 		EOF
 		test_cmp expect actual
diff --git a/t/t5549-fetch-push-http.sh b/t/t5549-fetch-push-http.sh
new file mode 100755
index 0000000..2cdebcb
--- /dev/null
+++ b/t/t5549-fetch-push-http.sh
@@ -0,0 +1,72 @@
+#!/bin/sh
+
+test_description='fetch/push functionality using the HTTP protocol'
+
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+. ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-httpd.sh
+start_httpd
+
+SERVER="$HTTPD_DOCUMENT_ROOT_PATH/server"
+URI="$HTTPD_URL/smart/server"
+
+grep_wrote () {
+	object_count=$1
+	file_name=$2
+	grep 'write_pack_file/wrote.*"value":"'$1'"' $2
+}
+
+setup_client_and_server () {
+	git init client &&
+	test_when_finished 'rm -rf client' &&
+	test_commit -C client first_commit &&
+	test_commit -C client second_commit &&
+
+	git init "$SERVER" &&
+	test_when_finished 'rm -rf "$SERVER"' &&
+	test_config -C "$SERVER" http.receivepack true &&
+	test_commit -C "$SERVER" unrelated_commit &&
+	git -C client push "$URI" first_commit:refs/remotes/origin/first_commit &&
+	git -C "$SERVER" config receive.hideRefs refs/remotes/origin/first_commit
+}
+
+test_expect_success 'push without negotiation (for comparing object counts with the next test)' '
+	setup_client_and_server &&
+
+	GIT_TRACE2_EVENT="$(pwd)/event" git -C client -c protocol.version=2 \
+		push "$URI" refs/heads/main:refs/remotes/origin/main &&
+	test_when_finished "rm -f event" &&
+	grep_wrote 6 event # 2 commits, 2 trees, 2 blobs
+'
+
+test_expect_success 'push with negotiation' '
+	setup_client_and_server &&
+
+	GIT_TRACE2_EVENT="$(pwd)/event" git -C client -c protocol.version=2 -c push.negotiate=1 \
+		push "$URI" refs/heads/main:refs/remotes/origin/main &&
+	test_when_finished "rm -f event" &&
+	grep_wrote 3 event # 1 commit, 1 tree, 1 blob
+'
+
+test_expect_success 'push with negotiation proceeds anyway even if negotiation fails' '
+	setup_client_and_server &&
+
+	# Use protocol v0 to make negotiation fail (because protocol v0 does
+	# not support the "wait-for-done" capability, which is required for
+	# push negotiation)
+	GIT_TEST_PROTOCOL_VERSION=0 GIT_TRACE2_EVENT="$(pwd)/event" git -C client -c push.negotiate=1 \
+		push "$URI" refs/heads/main:refs/remotes/origin/main 2>err &&
+	test_when_finished "rm -f event" &&
+	grep_wrote 6 event && # 2 commits, 2 trees, 2 blobs
+
+	cat >warning-expect <<-EOF &&
+	warning: --negotiate-only requires protocol v2
+	warning: push negotiation failed; proceeding anyway with push
+EOF
+	grep warning: err >warning-actual &&
+	test_cmp warning-expect warning-actual
+'
+
+test_done
diff --git a/t/t5550-http-fetch-dumb.sh b/t/t5550-http-fetch-dumb.sh
index 483578b..4c3b327 100755
--- a/t/t5550-http-fetch-dumb.sh
+++ b/t/t5550-http-fetch-dumb.sh
@@ -1,7 +1,17 @@
 #!/bin/sh
 
 test_description='test dumb fetching over http via static file'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
+
+if test_have_prereq !REFFILES
+then
+	skip_all='skipping test; dumb HTTP protocol not supported with reftable.'
+	test_done
+fi
+
 . "$TEST_DIRECTORY"/lib-httpd.sh
 start_httpd
 
@@ -15,18 +25,19 @@ test_expect_success 'setup repository' '
 	git commit -m two
 '
 
+setup_post_update_server_info_hook () {
+	test_hook --setup -C "$1" post-update <<-\EOF &&
+	exec git update-server-info
+	EOF
+	git -C "$1" update-server-info
+}
+
 test_expect_success 'create http-accessible bare repository with loose objects' '
 	cp -R .git "$HTTPD_DOCUMENT_ROOT_PATH/repo.git" &&
-	(cd "$HTTPD_DOCUMENT_ROOT_PATH/repo.git" &&
-	 git config core.bare true &&
-	 mkdir -p hooks &&
-	 write_script "hooks/post-update" <<-\EOF &&
-	 exec git update-server-info
-	EOF
-	 hooks/post-update
-	) &&
+	git -C "$HTTPD_DOCUMENT_ROOT_PATH/repo.git" config core.bare true &&
+	setup_post_update_server_info_hook "$HTTPD_DOCUMENT_ROOT_PATH/repo.git" &&
 	git remote add public "$HTTPD_DOCUMENT_ROOT_PATH/repo.git" &&
-	git push public master:master
+	git push public main:main
 '
 
 test_expect_success 'clone http repository' '
@@ -37,8 +48,8 @@ test_expect_success 'clone http repository' '
 
 test_expect_success 'list refs from outside any repository' '
 	cat >expect <<-EOF &&
-	$(git rev-parse master)	HEAD
-	$(git rev-parse master)	refs/heads/master
+	$(git rev-parse main)	HEAD
+	$(git rev-parse main)	refs/heads/main
 	EOF
 	nongit git ls-remote "$HTTPD_URL/dumb/repo.git" >actual &&
 	test_cmp expect actual
@@ -52,20 +63,14 @@ test_expect_success 'create password-protected repository' '
 
 test_expect_success 'create empty remote repository' '
 	git init --bare "$HTTPD_DOCUMENT_ROOT_PATH/empty.git" &&
-	(cd "$HTTPD_DOCUMENT_ROOT_PATH/empty.git" &&
-	 mkdir -p hooks &&
-	 write_script "hooks/post-update" <<-\EOF &&
-	 exec git update-server-info
-	EOF
-	 hooks/post-update
-	)
+	setup_post_update_server_info_hook "$HTTPD_DOCUMENT_ROOT_PATH/empty.git"
 '
 
-test_expect_success 'empty dumb HTTP repository has default hash algorithm' '
+test_expect_success 'empty dumb HTTP repository falls back to SHA1' '
 	test_when_finished "rm -fr clone-empty" &&
 	git clone $HTTPD_URL/dumb/empty.git clone-empty &&
 	git -C clone-empty rev-parse --show-object-format >empty-format &&
-	test "$(cat empty-format)" = "$(test_oid algo)"
+	test "$(cat empty-format)" = sha1
 '
 
 setup_askpass_helper
@@ -181,8 +186,8 @@ test_expect_success 'fetch changes via manual http-fetch' '
 
 	HEAD=$(git rev-parse --verify HEAD) &&
 	(cd clone2 &&
-	 git http-fetch -a -w heads/master-new $HEAD $(git config remote.origin.url) &&
-	 git checkout master-new &&
+	 git http-fetch -a -w heads/main-new $HEAD $(git config remote.origin.url) &&
+	 git checkout main-new &&
 	 test $HEAD = $(git rev-parse --verify HEAD)) &&
 	test_cmp file clone2/file
 '
@@ -192,19 +197,19 @@ test_expect_success 'manual http-fetch without -a works just as well' '
 
 	HEAD=$(git rev-parse --verify HEAD) &&
 	(cd clone3 &&
-	 git http-fetch -w heads/master-new $HEAD $(git config remote.origin.url) &&
-	 git checkout master-new &&
+	 git http-fetch -w heads/main-new $HEAD $(git config remote.origin.url) &&
+	 git checkout main-new &&
 	 test $HEAD = $(git rev-parse --verify HEAD)) &&
 	test_cmp file clone3/file
 '
 
 test_expect_success 'http remote detects correct HEAD' '
-	git push public master:other &&
+	git push public main:other &&
 	(cd clone &&
 	 git remote set-head origin -d &&
 	 git remote set-head origin -a &&
 	 git symbolic-ref refs/remotes/origin/HEAD > output &&
-	 echo refs/remotes/origin/master > expect &&
+	 echo refs/remotes/origin/main > expect &&
 	 test_cmp expect output
 	)
 '
@@ -224,9 +229,12 @@ test_expect_success 'http-fetch --packfile' '
 
 	git init packfileclient &&
 	p=$(cd "$HTTPD_DOCUMENT_ROOT_PATH"/repo_pack.git && ls objects/pack/pack-*.pack) &&
-	git -C packfileclient http-fetch --packfile=$ARBITRARY "$HTTPD_URL"/dumb/repo_pack.git/$p >out &&
+	git -C packfileclient http-fetch --packfile=$ARBITRARY \
+		--index-pack-arg=index-pack --index-pack-arg=--stdin \
+		--index-pack-arg=--keep \
+		"$HTTPD_URL"/dumb/repo_pack.git/$p >out &&
 
-	grep "^keep.[0-9a-f]\{16,\}$" out &&
+	grep -E "^keep.[0-9a-f]{16,}$" out &&
 	cut -c6- out >packhash &&
 
 	# Ensure that the expected files are generated
@@ -361,14 +369,14 @@ ja;q=0.95, zh;q=0.94, sv;q=0.93, pt;q=0.92, nb;q=0.91, *;q=0.90" \
 		ko_KR.EUC-KR:en_US.UTF-8:fr_CA:de.UTF-8@euro:sr@latin:ja:zh:sv:pt:nb
 '
 
-test_expect_success 'git client does not send an empty Accept-Language' '
+test_expect_success 'git client send an empty Accept-Language' '
 	GIT_TRACE_CURL=true LANGUAGE= git ls-remote "$HTTPD_URL/dumb/repo.git" 2>stderr &&
 	! grep "^=> Send header: Accept-Language:" stderr
 '
 
 test_expect_success 'remote-http complains cleanly about malformed urls' '
 	test_must_fail git remote-http http::/example.com/repo.git 2>stderr &&
-	test_i18ngrep "url has no scheme" stderr
+	test_grep "url has no scheme" stderr
 '
 
 # NEEDSWORK: Writing commands to git-remote-curl can race against the latter
@@ -377,7 +385,7 @@ test_expect_success 'remote-http complains cleanly about malformed urls' '
 test_expect_success 'remote-http complains cleanly about empty scheme' '
 	test_must_fail ok=sigpipe git ls-remote \
 		http::${HTTPD_URL#http}/dumb/repo.git 2>stderr &&
-	test_i18ngrep "url has no scheme" stderr
+	test_grep "url has no scheme" stderr
 '
 
 test_expect_success 'redirects can be forbidden/allowed' '
@@ -389,7 +397,7 @@ test_expect_success 'redirects can be forbidden/allowed' '
 
 test_expect_success 'redirects are reported to stderr' '
 	# just look for a snippet of the redirected-to URL
-	test_i18ngrep /dumb/ stderr
+	test_grep /dumb/ stderr
 '
 
 test_expect_success 'non-initial redirects can be forbidden' '
@@ -414,9 +422,10 @@ test_expect_success 'set up evil alternates scheme' '
 	sha1=$(git -C "$victim" rev-parse HEAD) &&
 
 	evil=$HTTPD_DOCUMENT_ROOT_PATH/evil.git &&
-	git init --bare "$evil" &&
+	git init --template= --bare "$evil" &&
+	mkdir "$evil/info" &&
 	# do this by hand to avoid object existence check
-	printf "%s\\t%s\\n" $sha1 refs/heads/master >"$evil/info/refs"
+	printf "%s\\t%s\\n" $sha1 refs/heads/main >"$evil/info/refs"
 '
 
 # Here we'll just redirect via HTTP. In a real-world attack these would be on
@@ -457,7 +466,7 @@ test_expect_success 'can redirect through non-"info/refs?service=git-upload-pack
 
 test_expect_success 'print HTTP error when any intermediate redirect throws error' '
 	test_must_fail git clone "$HTTPD_URL/redir-to/502" 2> stderr &&
-	test_i18ngrep "unable to access.*/redir-to/502" stderr
+	test_grep "unable to access.*/redir-to/502" stderr
 '
 
 test_expect_success 'fetching via http alternates works' '
diff --git a/t/t5551-http-fetch-smart.sh b/t/t5551-http-fetch-smart.sh
index e40e9ed..a623a10 100755
--- a/t/t5551-http-fetch-smart.sh
+++ b/t/t5551-http-fetch-smart.sh
@@ -1,10 +1,19 @@
 #!/bin/sh
 
-test_description='test smart fetching over http via http-backend'
+: ${HTTP_PROTO:=HTTP/1.1}
+test_description="test smart fetching over http via http-backend ($HTTP_PROTO)"
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-httpd.sh
+test "$HTTP_PROTO" = "HTTP/2" && enable_http2
 start_httpd
 
+test_expect_success HTTP2 'enable client-side http/2' '
+	git config --global http.version HTTP/2
+'
+
 test_expect_success 'setup repository' '
 	git config push.default matching &&
 	echo content >file &&
@@ -18,38 +27,77 @@ test_expect_success 'create http-accessible bare repository' '
 	 git --bare init
 	) &&
 	git remote add public "$HTTPD_DOCUMENT_ROOT_PATH/repo.git" &&
-	git push public master:master
+	git push public main:main
 '
 
 setup_askpass_helper
 
 test_expect_success 'clone http repository' '
-	cat >exp <<-\EOF &&
-	> GET /smart/repo.git/info/refs?service=git-upload-pack HTTP/1.1
-	> Accept: */*
-	> Accept-Encoding: ENCODINGS
-	> Pragma: no-cache
-	< HTTP/1.1 200 OK
-	< Pragma: no-cache
-	< Cache-Control: no-cache, max-age=0, must-revalidate
-	< Content-Type: application/x-git-upload-pack-advertisement
-	> POST /smart/repo.git/git-upload-pack HTTP/1.1
-	> Accept-Encoding: ENCODINGS
-	> Content-Type: application/x-git-upload-pack-request
-	> Accept: application/x-git-upload-pack-result
-	> Content-Length: xxx
-	< HTTP/1.1 200 OK
-	< Pragma: no-cache
-	< Cache-Control: no-cache, max-age=0, must-revalidate
-	< Content-Type: application/x-git-upload-pack-result
+	if test_have_prereq HTTP2 && test "$HTTPD_PROTO" = "https"
+	then
+		# ALPN lets us immediately use HTTP/2; likewise, POSTs with
+		# bodies can use it because they do not need to upgrade
+		INITIAL_PROTO=HTTP/2
+	else
+		# either we are not using HTTP/2, or the initial
+		# request is sent via HTTP/1.1 and asks for upgrade
+		INITIAL_PROTO=HTTP/1.1
+	fi &&
+
+	cat >exp.raw <<-EOF &&
+	> GET /smart/repo.git/info/refs?service=git-upload-pack $INITIAL_PROTO
+	> accept: */*
+	> accept-encoding: ENCODINGS
+	> accept-language: ko-KR, *;q=0.9
+	> pragma: no-cache
+	{V2} > git-protocol: version=2
+	< $HTTP_PROTO 200 OK
+	< pragma: no-cache
+	< cache-control: no-cache, max-age=0, must-revalidate
+	< content-type: application/x-git-upload-pack-advertisement
+	> POST /smart/repo.git/git-upload-pack $INITIAL_PROTO
+	> accept-encoding: ENCODINGS
+	> content-type: application/x-git-upload-pack-request
+	> accept: application/x-git-upload-pack-result
+	> accept-language: ko-KR, *;q=0.9
+	{V2} > git-protocol: version=2
+	> content-length: xxx
+	< $INITIAL_PROTO 200 OK
+	< pragma: no-cache
+	< cache-control: no-cache, max-age=0, must-revalidate
+	< content-type: application/x-git-upload-pack-result
+	{V2} > POST /smart/repo.git/git-upload-pack $INITIAL_PROTO
+	{V2} > accept-encoding: ENCODINGS
+	{V2} > content-type: application/x-git-upload-pack-request
+	{V2} > accept: application/x-git-upload-pack-result
+	{V2} > accept-language: ko-KR, *;q=0.9
+	{V2} > git-protocol: version=2
+	{V2} > content-length: xxx
+	{V2} < $INITIAL_PROTO 200 OK
+	{V2} < pragma: no-cache
+	{V2} < cache-control: no-cache, max-age=0, must-revalidate
+	{V2} < content-type: application/x-git-upload-pack-result
 	EOF
-	GIT_TRACE_CURL=true GIT_TEST_PROTOCOL_VERSION=0 \
+
+	if test "$GIT_TEST_PROTOCOL_VERSION" = 0
+	then
+		sed "/^{V2}/d" <exp.raw >exp
+	else
+		sed "s/^{V2} //" <exp.raw >exp
+	fi &&
+
+	GIT_TRACE_CURL=true LANGUAGE="ko_KR.UTF-8" \
 		git clone --quiet $HTTPD_URL/smart/repo.git clone 2>err &&
 	test_cmp file clone/file &&
 	tr '\''\015'\'' Q <err |
+	perl -pe '\''
+		s/(Send|Recv) header: ([A-Za-z0-9-]+):/
+		"$1 header: " . lc($2) . ":"
+		/e;
+	'\'' |
 	sed -e "
 		s/Q\$//
-		/^[*] /d
+		/^[^<=]/d
 		/^== Info:/d
 		/^=> Send header, /d
 		/^=> Send header:$/d
@@ -59,6 +107,8 @@ test_expect_success 'clone http repository' '
 		s/= Recv header://
 		/^<= Recv data/d
 		/^=> Send data/d
+		/^<= Recv SSL data/d
+		/^=> Send SSL data/d
 		/^$/d
 		/^< $/d
 
@@ -66,33 +116,35 @@ test_expect_success 'clone http repository' '
 			s/^/> /
 		}
 
-		/^> User-Agent: /d
-		/^> Host: /d
+		/^< HTTP/ {
+			s/200$/200 OK/
+		}
+		/^< HTTP\\/1.1 101/d
+		/^[><] connection: /d
+		/^[><] upgrade: /d
+		/^> http2-settings: /d
+
+		/^> user-agent: /d
+		/^> host: /d
 		/^> POST /,$ {
 			/^> Accept: [*]\\/[*]/d
 		}
-		s/^> Content-Length: .*/> Content-Length: xxx/
+		s/^> content-length: .*/> content-length: xxx/
 		/^> 00..want /d
 		/^> 00.*done/d
 
-		/^< Server: /d
-		/^< Expires: /d
-		/^< Date: /d
-		/^< Content-Length: /d
-		/^< Transfer-Encoding: /d
+		/^< server: /d
+		/^< expires: /d
+		/^< date: /d
+		/^< content-length: /d
+		/^< transfer-encoding: /d
 	" >actual &&
 
-	# NEEDSWORK: If the overspecification of the expected result is reduced, we
-	# might be able to run this test in all protocol versions.
-	if test "$GIT_TEST_PROTOCOL_VERSION" = 0
-	then
-		sed -e "s/^> Accept-Encoding: .*/> Accept-Encoding: ENCODINGS/" \
-				actual >actual.smudged &&
-		test_cmp exp actual.smudged &&
+	sed -e "s/^> accept-encoding: .*/> accept-encoding: ENCODINGS/" \
+			actual >actual.smudged &&
+	test_cmp exp actual.smudged &&
 
-		grep "Accept-Encoding:.*gzip" actual >actual.gzip &&
-		test_line_count = 2 actual.gzip
-	fi
+	grep "accept-encoding:.*gzip" actual >actual.gzip
 '
 
 test_expect_success 'fetch changes via http' '
@@ -104,19 +156,9 @@ test_expect_success 'fetch changes via http' '
 '
 
 test_expect_success 'used upload-pack service' '
-	cat >exp <<-\EOF &&
-	GET  /smart/repo.git/info/refs?service=git-upload-pack HTTP/1.1 200
-	POST /smart/repo.git/git-upload-pack HTTP/1.1 200
-	GET  /smart/repo.git/info/refs?service=git-upload-pack HTTP/1.1 200
-	POST /smart/repo.git/git-upload-pack HTTP/1.1 200
-	EOF
-
-	# NEEDSWORK: If the overspecification of the expected result is reduced, we
-	# might be able to run this test in all protocol versions.
-	if test "$GIT_TEST_PROTOCOL_VERSION" = 0
-	then
-		check_access_log exp
-	fi
+	strip_access_log >log &&
+	grep "GET  /smart/repo.git/info/refs?service=git-upload-pack HTTP/[0-9.]* 200" log &&
+	grep "POST /smart/repo.git/git-upload-pack HTTP/[0-9.]* 200" log
 '
 
 test_expect_success 'follow redirects (301)' '
@@ -172,8 +214,8 @@ test_expect_success 'no-op half-auth fetch does not require a password' '
 	# This is not possible with protocol v2, since both objects and refs
 	# are obtained from the "git-upload-pack" path. A solution to this is
 	# to teach the server and client to be able to inline ls-refs requests
-	# as an Extra Parameter (see pack-protocol.txt), so that "info/refs"
-	# can serve refs, just like it does in protocol v0.
+	# as an Extra Parameter (see "git help gitformat-pack-protocol"), so that
+	# "info/refs" can serve refs, just like it does in protocol v0.
 	GIT_TEST_PROTOCOL_VERSION=0 git --git-dir=half-auth fetch &&
 	expect_askpass none
 '
@@ -193,8 +235,8 @@ test_expect_success 'GIT_TRACE_CURL redacts auth details' '
 
 	# Ensure that there is no "Basic" followed by a base64 string, but that
 	# the auth details are redacted
-	! grep "Authorization: Basic [0-9a-zA-Z+/]" trace &&
-	grep "Authorization: Basic <redacted>" trace
+	! grep -i "Authorization: Basic [0-9a-zA-Z+/]" trace &&
+	grep -i "Authorization: Basic <redacted>" trace
 '
 
 test_expect_success 'GIT_CURL_VERBOSE redacts auth details' '
@@ -205,8 +247,8 @@ test_expect_success 'GIT_CURL_VERBOSE redacts auth details' '
 
 	# Ensure that there is no "Basic" followed by a base64 string, but that
 	# the auth details are redacted
-	! grep "Authorization: Basic [0-9a-zA-Z+/]" trace &&
-	grep "Authorization: Basic <redacted>" trace
+	! grep -i "Authorization: Basic [0-9a-zA-Z+/]" trace &&
+	grep -i "Authorization: Basic <redacted>" trace
 '
 
 test_expect_success 'GIT_TRACE_CURL does not redact auth details if GIT_TRACE_REDACT=0' '
@@ -216,7 +258,7 @@ test_expect_success 'GIT_TRACE_CURL does not redact auth details if GIT_TRACE_RE
 		git clone --bare "$HTTPD_URL/auth/smart/repo.git" redact-auth &&
 	expect_askpass both user@host &&
 
-	grep "Authorization: Basic [0-9a-zA-Z+/]" trace
+	grep -i "Authorization: Basic [0-9a-zA-Z+/]" trace
 '
 
 test_expect_success 'disable dumb http on server' '
@@ -233,14 +275,14 @@ test_expect_success 'GIT_SMART_HTTP can disable smart http' '
 
 test_expect_success 'invalid Content-Type rejected' '
 	test_must_fail git clone $HTTPD_URL/broken_smart/repo.git 2>actual &&
-	test_i18ngrep "not valid:" actual
+	test_grep "not valid:" actual
 '
 
 test_expect_success 'create namespaced refs' '
 	test_commit namespaced &&
-	git push public HEAD:refs/namespaces/ns/refs/heads/master &&
+	git push public HEAD:refs/namespaces/ns/refs/heads/main &&
 	git --git-dir="$HTTPD_DOCUMENT_ROOT_PATH/repo.git" \
-		symbolic-ref refs/namespaces/ns/HEAD refs/namespaces/ns/refs/heads/master
+		symbolic-ref refs/namespaces/ns/HEAD refs/namespaces/ns/refs/heads/main
 '
 
 test_expect_success 'smart clone respects namespace' '
@@ -265,21 +307,23 @@ test_expect_success 'cookies stored in http.cookiefile when http.savecookies set
 	127.0.0.1	FALSE	/smart_cookies/	FALSE	0	othername	othervalue
 	EOF
 	sort >expect_cookies.txt <<-\EOF &&
-
 	127.0.0.1	FALSE	/smart_cookies/	FALSE	0	othername	othervalue
+	127.0.0.1	FALSE	/smart_cookies/repo.git/	FALSE	0	name	value
 	127.0.0.1	FALSE	/smart_cookies/repo.git/info/	FALSE	0	name	value
 	EOF
 	git config http.cookiefile cookies.txt &&
 	git config http.savecookies true &&
-	git ls-remote $HTTPD_URL/smart_cookies/repo.git master &&
 
-	# NEEDSWORK: If the overspecification of the expected result is reduced, we
-	# might be able to run this test in all protocol versions.
-	if test "$GIT_TEST_PROTOCOL_VERSION" = 0
-	then
-		tail -3 cookies.txt | sort >cookies_tail.txt &&
-		test_cmp expect_cookies.txt cookies_tail.txt
-	fi
+	test_when_finished "
+		git --git-dir=\"\$HTTPD_DOCUMENT_ROOT_PATH/repo.git\" \
+			tag -d cookie-tag
+	" &&
+	git --git-dir="$HTTPD_DOCUMENT_ROOT_PATH/repo.git" \
+		tag -m "foo" cookie-tag &&
+	git fetch $HTTPD_URL/smart_cookies/repo.git cookie-tag &&
+
+	grep "^[^#]" cookies.txt | sort >cookies_stripped.txt &&
+	test_cmp expect_cookies.txt cookies_stripped.txt
 '
 
 test_expect_success 'transfer.hiderefs works over smart-http' '
@@ -315,7 +359,9 @@ create_tags () {
 
 	# now assign tags to all the dangling commits we created above
 	tag=$(perl -e "print \"bla\" x 30") &&
-	sed -e "s|^:\([^ ]*\) \(.*\)$|\2 refs/tags/$tag-\1|" <marks >>packed-refs
+	sed -e "s|^:\([^ ]*\) \(.*\)$|create refs/tags/$tag-\1 \2|" <marks >input &&
+	git update-ref --stdin <input &&
+	rm input
 }
 
 test_expect_success 'create 2,000 tags in the repo' '
@@ -338,18 +384,21 @@ test_expect_success CMDLINE_LIMIT \
 test_expect_success 'large fetch-pack requests can be sent using chunked encoding' '
 	GIT_TRACE_CURL=true git -c http.postbuffer=65536 \
 		clone --bare "$HTTPD_URL/smart/repo.git" split.git 2>err &&
-	grep "^=> Send header: Transfer-Encoding: chunked" err
+	{
+		test_have_prereq HTTP2 ||
+		grep "^=> Send header: Transfer-Encoding: chunked" err
+	}
 '
 
 test_expect_success 'test allowreachablesha1inwant' '
 	test_when_finished "rm -rf test_reachable.git" &&
 	server="$HTTPD_DOCUMENT_ROOT_PATH/repo.git" &&
-	master_sha=$(git -C "$server" rev-parse refs/heads/master) &&
+	main_sha=$(git -C "$server" rev-parse refs/heads/main) &&
 	git -C "$server" config uploadpack.allowreachablesha1inwant 1 &&
 
 	git init --bare test_reachable.git &&
 	git -C test_reachable.git remote add origin "$HTTPD_URL/smart/repo.git" &&
-	git -C test_reachable.git fetch origin "$master_sha"
+	git -C test_reachable.git fetch origin "$main_sha"
 '
 
 test_expect_success 'test allowreachablesha1inwant with unreachable' '
@@ -363,7 +412,7 @@ test_expect_success 'test allowreachablesha1inwant with unreachable' '
 	git push public :refs/heads/doomed &&
 
 	server="$HTTPD_DOCUMENT_ROOT_PATH/repo.git" &&
-	master_sha=$(git -C "$server" rev-parse refs/heads/master) &&
+	main_sha=$(git -C "$server" rev-parse refs/heads/main) &&
 	git -C "$server" config uploadpack.allowreachablesha1inwant 1 &&
 
 	git init --bare test_reachable.git &&
@@ -385,7 +434,7 @@ test_expect_success 'test allowanysha1inwant with unreachable' '
 	git push public :refs/heads/doomed &&
 
 	server="$HTTPD_DOCUMENT_ROOT_PATH/repo.git" &&
-	master_sha=$(git -C "$server" rev-parse refs/heads/master) &&
+	main_sha=$(git -C "$server" rev-parse refs/heads/main) &&
 	git -C "$server" config uploadpack.allowreachablesha1inwant 1 &&
 
 	git init --bare test_reachable.git &&
@@ -444,8 +493,8 @@ test_expect_success 'using fetch command in remote-curl updates refs' '
 	test_commit -C "$SERVER" bar &&
 	git -C client -c protocol.version=0 fetch &&
 
-	git -C "$SERVER" rev-parse master >expect &&
-	git -C client rev-parse origin/master >actual &&
+	git -C "$SERVER" rev-parse main >expect &&
+	git -C client rev-parse origin/main >actual &&
 	test_cmp expect actual
 '
 
@@ -471,10 +520,10 @@ test_expect_success 'cookies are redacted by default' '
 	GIT_TRACE_CURL=true \
 		git -c "http.cookieFile=$(pwd)/cookies" clone \
 		$HTTPD_URL/smart/repo.git clone 2>err &&
-	grep "Cookie:.*Foo=<redacted>" err &&
-	grep "Cookie:.*Bar=<redacted>" err &&
-	! grep "Cookie:.*Foo=1" err &&
-	! grep "Cookie:.*Bar=2" err
+	grep -i "Cookie:.*Foo=<redacted>" err &&
+	grep -i "Cookie:.*Bar=<redacted>" err &&
+	! grep -i "Cookie:.*Foo=1" err &&
+	! grep -i "Cookie:.*Bar=2" err
 '
 
 test_expect_success 'empty values of cookies are also redacted' '
@@ -483,7 +532,7 @@ test_expect_success 'empty values of cookies are also redacted' '
 	GIT_TRACE_CURL=true \
 		git -c "http.cookieFile=$(pwd)/cookies" clone \
 		$HTTPD_URL/smart/repo.git clone 2>err &&
-	grep "Cookie:.*Foo=<redacted>" err
+	grep -i "Cookie:.*Foo=<redacted>" err
 '
 
 test_expect_success 'GIT_TRACE_REDACT=0 disables cookie redaction' '
@@ -493,8 +542,8 @@ test_expect_success 'GIT_TRACE_REDACT=0 disables cookie redaction' '
 	GIT_TRACE_REDACT=0 GIT_TRACE_CURL=true \
 		git -c "http.cookieFile=$(pwd)/cookies" clone \
 		$HTTPD_URL/smart/repo.git clone 2>err &&
-	grep "Cookie:.*Foo=1" err &&
-	grep "Cookie:.*Bar=2" err
+	grep -i "Cookie:.*Foo=1" err &&
+	grep -i "Cookie:.*Bar=2" err
 '
 
 test_expect_success 'GIT_TRACE_CURL_NO_DATA prevents data from being traced' '
@@ -511,7 +560,195 @@ test_expect_success 'GIT_TRACE_CURL_NO_DATA prevents data from being traced' '
 
 test_expect_success 'server-side error detected' '
 	test_must_fail git clone $HTTPD_URL/error_smart/repo.git 2>actual &&
-	test_i18ngrep "server-side error" actual
+	test_grep "server-side error" actual
+'
+
+test_expect_success 'http auth remembers successful credentials' '
+	rm -f .git-credentials &&
+	test_config credential.helper store &&
+
+	# the first request prompts the user...
+	set_askpass user@host pass@host &&
+	git ls-remote "$HTTPD_URL/auth/smart/repo.git" >/dev/null &&
+	expect_askpass both user@host &&
+
+	# ...and the second one uses the stored value rather than
+	# prompting the user.
+	set_askpass bogus-user bogus-pass &&
+	git ls-remote "$HTTPD_URL/auth/smart/repo.git" >/dev/null &&
+	expect_askpass none
+'
+
+test_expect_success 'http auth forgets bogus credentials' '
+	# seed credential store with bogus values. In real life,
+	# this would probably come from a password which worked
+	# for a previous request.
+	rm -f .git-credentials &&
+	test_config credential.helper store &&
+	{
+		echo "url=$HTTPD_URL" &&
+		echo "username=bogus" &&
+		echo "password=bogus"
+	} | git credential approve &&
+
+	# we expect this to use the bogus values and fail, never even
+	# prompting the user...
+	set_askpass user@host pass@host &&
+	test_must_fail git ls-remote "$HTTPD_URL/auth/smart/repo.git" >/dev/null &&
+	expect_askpass none &&
+
+	# ...but now we should have forgotten the bad value, causing
+	# us to prompt the user again.
+	set_askpass user@host pass@host &&
+	git ls-remote "$HTTPD_URL/auth/smart/repo.git" >/dev/null &&
+	expect_askpass both user@host
+'
+
+test_expect_success 'client falls back from v2 to v0 to match server' '
+	GIT_TRACE_PACKET=$PWD/trace \
+	GIT_TEST_PROTOCOL_VERSION=2 \
+	git clone $HTTPD_URL/smart_v0/repo.git repo-v0 &&
+	# check for v0; there the HEAD symref is communicated in the capability
+	# line; v2 uses a different syntax on each ref advertisement line
+	grep symref=HEAD:refs/heads/ trace
+'
+
+test_expect_success 'create empty http-accessible SHA-256 repository' '
+	mkdir "$HTTPD_DOCUMENT_ROOT_PATH/sha256.git" &&
+	(cd "$HTTPD_DOCUMENT_ROOT_PATH/sha256.git" &&
+	 git --bare init --object-format=sha256
+	)
+'
+
+test_expect_success 'clone empty SHA-256 repository with protocol v2' '
+	rm -fr sha256 &&
+	echo sha256 >expected &&
+	git -c protocol.version=2 clone "$HTTPD_URL/smart/sha256.git" &&
+	git -C sha256 rev-parse --show-object-format >actual &&
+	test_cmp actual expected &&
+	git ls-remote "$HTTPD_URL/smart/sha256.git" >actual &&
+	test_must_be_empty actual
+'
+
+test_expect_success 'clone empty SHA-256 repository with protocol v0' '
+	rm -fr sha256 &&
+	echo sha256 >expected &&
+	GIT_TRACE=1 GIT_TRACE_PACKET=1 git -c protocol.version=0 clone "$HTTPD_URL/smart/sha256.git" &&
+	git -C sha256 rev-parse --show-object-format >actual &&
+	test_cmp actual expected &&
+	git ls-remote "$HTTPD_URL/smart/sha256.git" >actual &&
+	test_must_be_empty actual
+'
+
+test_expect_success 'passing hostname resolution information works' '
+	BOGUS_HOST=gitbogusexamplehost.invalid &&
+	BOGUS_HTTPD_URL=$HTTPD_PROTO://$BOGUS_HOST:$LIB_HTTPD_PORT &&
+	test_must_fail git ls-remote "$BOGUS_HTTPD_URL/smart/repo.git" >/dev/null &&
+	git -c "http.curloptResolve=$BOGUS_HOST:$LIB_HTTPD_PORT:127.0.0.1" ls-remote "$BOGUS_HTTPD_URL/smart/repo.git" >/dev/null
+'
+
+# here user%40host is the URL-encoded version of user@host,
+# which is our intentionally-odd username to catch parsing errors
+url_user=$HTTPD_URL_USER/auth/smart/repo.git
+url_userpass=$HTTPD_URL_USER_PASS/auth/smart/repo.git
+url_userblank=$HTTPD_PROTO://user%40host:@$HTTPD_DEST/auth/smart/repo.git
+message="URL .*:<redacted>@.* uses plaintext credentials"
+
+test_expect_success 'clone warns or fails when using username:password' '
+	test_when_finished "rm -rf attempt*" &&
+
+	git -c transfer.credentialsInUrl=allow \
+		clone $url_userpass attempt1 2>err &&
+	! grep "$message" err &&
+
+	git -c transfer.credentialsInUrl=warn \
+		clone $url_userpass attempt2 2>err &&
+	grep "warning: $message" err >warnings &&
+	test_line_count -ge 1 warnings &&
+
+	test_must_fail git -c transfer.credentialsInUrl=die \
+		clone $url_userpass attempt3 2>err &&
+	grep "fatal: $message" err >warnings &&
+	test_line_count -ge 1 warnings &&
+
+	test_must_fail git -c transfer.credentialsInUrl=die \
+		clone $url_userblank attempt4 2>err &&
+	grep "fatal: $message" err >warnings &&
+	test_line_count -ge 1 warnings
+'
+
+test_expect_success 'clone does not detect username:password when it is https://username@domain:port/' '
+	test_when_finished "rm -rf attempt1" &&
+
+	# we are relying on lib-httpd for url construction, so document our
+	# assumptions
+	case "$HTTPD_URL_USER" in
+	*:[0-9]*) : ok ;;
+	*) BUG "httpd url does not have port: $HTTPD_URL_USER"
+	esac &&
+
+	git -c transfer.credentialsInUrl=warn clone $url_user attempt1 2>err &&
+	! grep "uses plaintext credentials" err
+'
+
+test_expect_success 'fetch warns or fails when using username:password' '
+	git -c transfer.credentialsInUrl=allow fetch $url_userpass 2>err &&
+	! grep "$message" err &&
+
+	git -c transfer.credentialsInUrl=warn fetch $url_userpass 2>err &&
+	grep "warning: $message" err >warnings &&
+	test_line_count -ge 1 warnings &&
+
+	test_must_fail git -c transfer.credentialsInUrl=die \
+		fetch $url_userpass 2>err &&
+	grep "fatal: $message" err >warnings &&
+	test_line_count -ge 1 warnings &&
+
+	test_must_fail git -c transfer.credentialsInUrl=die \
+		fetch $url_userblank 2>err &&
+	grep "fatal: $message" err >warnings &&
+	test_line_count -ge 1 warnings
+'
+
+
+test_expect_success 'push warns or fails when using username:password' '
+	git -c transfer.credentialsInUrl=allow push $url_userpass 2>err &&
+	! grep "$message" err &&
+
+	git -c transfer.credentialsInUrl=warn push $url_userpass 2>err &&
+	grep "warning: $message" err >warnings &&
+
+	test_must_fail git -c transfer.credentialsInUrl=die \
+		push $url_userpass 2>err &&
+	grep "fatal: $message" err >warnings &&
+	test_line_count -ge 1 warnings
+'
+
+test_expect_success 'no empty path components' '
+	# In the URL, add a trailing slash, and see if git appends yet another
+	# slash.
+	git clone $HTTPD_URL/smart/repo.git/ clone-with-slash &&
+
+	strip_access_log >log &&
+	! grep "//" log
+'
+
+test_expect_success 'tag following always works over v0 http' '
+	upstream=$HTTPD_DOCUMENT_ROOT_PATH/tags &&
+	git init "$upstream" &&
+	(
+		cd "$upstream" &&
+		git commit --allow-empty -m base &&
+		git tag not-annotated &&
+		git tag -m foo annotated
+	) &&
+	git init tags &&
+	git -C tags -c protocol.version=0 \
+		fetch --depth 1 $HTTPD_URL/smart/tags \
+		refs/tags/annotated:refs/tags/annotated &&
+	git -C "$upstream" for-each-ref refs/tags >expect &&
+	git -C tags for-each-ref >actual &&
+	test_cmp expect actual
 '
 
 test_done
diff --git a/t/t5552-skipping-fetch-negotiator.sh b/t/t5552-skipping-fetch-negotiator.sh
index 156c704..b55a9f6 100755
--- a/t/t5552-skipping-fetch-negotiator.sh
+++ b/t/t5552-skipping-fetch-negotiator.sh
@@ -3,6 +3,22 @@
 test_description='test skipping fetch negotiator'
 . ./test-lib.sh
 
+test_expect_success 'fetch.negotiationalgorithm config' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	cat >repo/.git/config <<-\EOF &&
+	[fetch]
+	negotiationAlgorithm
+	EOF
+	cat >expect <<-\EOF &&
+	error: missing value for '\''fetch.negotiationalgorithm'\''
+	fatal: bad config variable '\''fetch.negotiationalgorithm'\'' in file '\''.git/config'\'' at line 2
+	EOF
+	test_expect_code 128 git -C repo fetch >out 2>actual &&
+	test_must_be_empty out &&
+	test_cmp expect actual
+'
+
 have_sent () {
 	while test "$#" -ne 0
 	do
@@ -48,7 +64,7 @@ test_expect_success 'commits with no parents are sent regardless of skip distanc
 	git init client &&
 	for i in $(test_seq 7)
 	do
-		test_commit -C client c$i
+		test_commit -C client c$i || return 1
 	done &&
 
 	# We send: "c7" (skip 1) "c5" (skip 2) "c2" (skip 4). After that, since
@@ -68,7 +84,7 @@ test_expect_success 'when two skips collide, favor the larger one' '
 	git init client &&
 	for i in $(test_seq 11)
 	do
-		test_commit -C client c$i
+		test_commit -C client c$i || return 1
 	done &&
 	git -C client checkout c5 &&
 	test_commit -C client c5side &&
@@ -100,7 +116,7 @@ test_expect_success 'use ref advertisement to filter out commits' '
 	git -C server checkout --orphan anotherbranch &&
 	test_commit -C server to_fetch &&
 
-	# The server advertising "c3" (as "refs/heads/master") means that we do
+	# The server advertising "c3" (as "refs/heads/main") means that we do
 	# not need to send any ancestors of "c3", but we still need to send "c3"
 	# itself.
 	test_config -C client fetch.negotiationalgorithm skipping &&
@@ -155,14 +171,14 @@ test_expect_success 'do not send "have" with ancestors of commits that server AC
 	for i in $(test_seq 8)
 	do
 		git -C client checkout --orphan b$i &&
-		test_commit -C client b$i.c0
+		test_commit -C client b$i.c0 || return 1
 	done &&
 	for j in $(test_seq 19)
 	do
 		for i in $(test_seq 8)
 		do
 			git -C client checkout b$i &&
-			test_commit -C client b$i.c$j
+			test_commit -C client b$i.c$j || return 1
 		done
 	done &&
 
@@ -201,7 +217,7 @@ test_expect_success 'do not send "have" with ancestors of commits that server AC
 	# should still send the others (in this test, just check b2).
 	for i in $(test_seq 0 8)
 	do
-		have_not_sent b1.c$i
+		have_not_sent b1.c$i || return 1
 	done &&
 	have_sent b2.c1 b2.c0
 '
diff --git a/t/t5553-set-upstream.sh b/t/t5553-set-upstream.sh
index 7622981..4805016 100755
--- a/t/t5553-set-upstream.sh
+++ b/t/t5553-set-upstream.sh
@@ -1,6 +1,9 @@
 #!/bin/sh
 
 test_description='"git fetch/pull --set-upstream" basic tests.'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 check_config () {
@@ -32,9 +35,9 @@ test_expect_success 'setup bare parent fetch' '
 	git remote add upstream parent
 '
 
-test_expect_success 'setup commit on master and other fetch' '
+test_expect_success 'setup commit on main and other fetch' '
 	test_commit one &&
-	git push upstream master &&
+	git push upstream main &&
 	git checkout -b other &&
 	test_commit two &&
 	git push upstream other
@@ -43,38 +46,38 @@ test_expect_success 'setup commit on master and other fetch' '
 # tests for fetch --set-upstream
 
 test_expect_success 'fetch --set-upstream does not set upstream w/o branch' '
-	clear_config master other &&
-	git checkout master &&
+	clear_config main other &&
+	git checkout main &&
 	git fetch --set-upstream upstream &&
-	check_config_missing master &&
+	check_config_missing main &&
 	check_config_missing other
 '
 
-test_expect_success 'fetch --set-upstream upstream master sets branch master but not other' '
-	clear_config master other &&
-	git fetch --set-upstream upstream master &&
-	check_config master upstream refs/heads/master &&
+test_expect_success 'fetch --set-upstream upstream main sets branch main but not other' '
+	clear_config main other &&
+	git fetch --set-upstream upstream main &&
+	check_config main upstream refs/heads/main &&
 	check_config_missing other
 '
 
 test_expect_success 'fetch --set-upstream upstream other sets branch other' '
-	clear_config master other &&
+	clear_config main other &&
 	git fetch --set-upstream upstream other &&
-	check_config master upstream refs/heads/other &&
+	check_config main upstream refs/heads/other &&
 	check_config_missing other
 '
 
-test_expect_success 'fetch --set-upstream master:other does not set the branch other2' '
+test_expect_success 'fetch --set-upstream main:other does not set the branch other2' '
 	clear_config other2 &&
-	git fetch --set-upstream upstream master:other2 &&
+	git fetch --set-upstream upstream main:other2 &&
 	check_config_missing other2
 '
 
 test_expect_success 'fetch --set-upstream http://nosuchdomain.example.com fails with invalid url' '
-	# master explicitly not cleared, we check that it is not touched from previous value
+	# main explicitly not cleared, we check that it is not touched from previous value
 	clear_config other other2 &&
 	test_must_fail git fetch --set-upstream http://nosuchdomain.example.com &&
-	check_config master upstream refs/heads/other &&
+	check_config main upstream refs/heads/other &&
 	check_config_missing other &&
 	check_config_missing other2
 '
@@ -83,11 +86,22 @@ test_expect_success 'fetch --set-upstream with valid URL sets upstream to URL' '
 	clear_config other other2 &&
 	url="file://$PWD" &&
 	git fetch --set-upstream "$url" &&
-	check_config master "$url" HEAD &&
+	check_config main "$url" HEAD &&
 	check_config_missing other &&
 	check_config_missing other2
 '
 
+test_expect_success 'fetch --set-upstream with a detached HEAD' '
+	git checkout HEAD^0 &&
+	test_when_finished "git checkout -" &&
+	cat >expect <<-\EOF &&
+	warning: could not set upstream of HEAD to '"'"'main'"'"' from '"'"'upstream'"'"' when it does not point to any branch.
+	EOF
+	git fetch --set-upstream upstream main 2>actual.raw &&
+	grep ^warning: actual.raw >actual &&
+	test_cmp expect actual
+'
+
 # tests for pull --set-upstream
 
 test_expect_success 'setup bare parent pull' '
@@ -96,83 +110,94 @@ test_expect_success 'setup bare parent pull' '
 	git remote add upstream parent
 '
 
-test_expect_success 'setup commit on master and other pull' '
+test_expect_success 'setup commit on main and other pull' '
 	test_commit three &&
-	git push --tags upstream master &&
+	git push --tags upstream main &&
 	test_commit four &&
 	git push upstream other
 '
 
-test_expect_success 'pull --set-upstream upstream master sets branch master but not other' '
-	clear_config master other &&
-	git pull --set-upstream upstream master &&
-	check_config master upstream refs/heads/master &&
+test_expect_success 'pull --set-upstream upstream main sets branch main but not other' '
+	clear_config main other &&
+	git pull --no-rebase --set-upstream upstream main &&
+	check_config main upstream refs/heads/main &&
 	check_config_missing other
 '
 
-test_expect_success 'pull --set-upstream master:other2 does not set the branch other2' '
+test_expect_success 'pull --set-upstream main:other2 does not set the branch other2' '
 	clear_config other2 &&
-	git pull --set-upstream upstream master:other2 &&
+	git pull --no-rebase --set-upstream upstream main:other2 &&
 	check_config_missing other2
 '
 
-test_expect_success 'pull --set-upstream upstream other sets branch master' '
-	clear_config master other &&
-	git pull --set-upstream upstream other &&
-	check_config master upstream refs/heads/other &&
+test_expect_success 'pull --set-upstream upstream other sets branch main' '
+	clear_config main other &&
+	git pull --no-rebase --set-upstream upstream other &&
+	check_config main upstream refs/heads/other &&
 	check_config_missing other
 '
 
 test_expect_success 'pull --set-upstream upstream tag does not set the tag' '
 	clear_config three &&
-	git pull --tags --set-upstream upstream three &&
+	git pull --no-rebase --tags --set-upstream upstream three &&
 	check_config_missing three
 '
 
 test_expect_success 'pull --set-upstream http://nosuchdomain.example.com fails with invalid url' '
-	# master explicitly not cleared, we check that it is not touched from previous value
+	# main explicitly not cleared, we check that it is not touched from previous value
 	clear_config other other2 three &&
 	test_must_fail git pull --set-upstream http://nosuchdomain.example.com &&
-	check_config master upstream refs/heads/other &&
+	check_config main upstream refs/heads/other &&
 	check_config_missing other &&
 	check_config_missing other2 &&
 	check_config_missing three
 '
 
 test_expect_success 'pull --set-upstream upstream HEAD sets branch HEAD' '
-	clear_config master other &&
-	git pull --set-upstream upstream HEAD &&
-	check_config master upstream HEAD &&
+	clear_config main other &&
+	git pull --no-rebase --set-upstream upstream HEAD &&
+	check_config main upstream HEAD &&
 	git checkout other &&
-	git pull --set-upstream upstream HEAD &&
+	git pull --no-rebase --set-upstream upstream HEAD &&
 	check_config other upstream HEAD
 '
 
 test_expect_success 'pull --set-upstream upstream with more than one branch does nothing' '
-	clear_config master three &&
-	git pull --set-upstream upstream master three &&
-	check_config_missing master &&
+	clear_config main three &&
+	git pull --no-rebase --set-upstream upstream main three &&
+	check_config_missing main &&
 	check_config_missing three
 '
 
 test_expect_success 'pull --set-upstream with valid URL sets upstream to URL' '
-	clear_config master other other2 &&
-	git checkout master &&
+	clear_config main other other2 &&
+	git checkout main &&
 	url="file://$PWD" &&
 	git pull --set-upstream "$url" &&
-	check_config master "$url" HEAD &&
+	check_config main "$url" HEAD &&
 	check_config_missing other &&
 	check_config_missing other2
 '
 
 test_expect_success 'pull --set-upstream with valid URL and branch sets branch' '
-	clear_config master other other2 &&
-	git checkout master &&
+	clear_config main other other2 &&
+	git checkout main &&
 	url="file://$PWD" &&
-	git pull --set-upstream "$url" master &&
-	check_config master "$url" refs/heads/master &&
+	git pull --set-upstream "$url" main &&
+	check_config main "$url" refs/heads/main &&
 	check_config_missing other &&
 	check_config_missing other2
 '
 
+test_expect_success 'pull --set-upstream with a detached HEAD' '
+	git checkout HEAD^0 &&
+	test_when_finished "git checkout -" &&
+	cat >expect <<-\EOF &&
+	warning: could not set upstream of HEAD to '"'"'main'"'"' from '"'"'upstream'"'"' when it does not point to any branch.
+	EOF
+	git pull --no-rebase --set-upstream upstream main 2>actual.raw &&
+	grep ^warning: actual.raw >actual &&
+	test_cmp expect actual
+'
+
 test_done
diff --git a/t/t5554-noop-fetch-negotiator.sh b/t/t5554-noop-fetch-negotiator.sh
new file mode 100755
index 0000000..06991e8
--- /dev/null
+++ b/t/t5554-noop-fetch-negotiator.sh
@@ -0,0 +1,24 @@
+#!/bin/sh
+
+test_description='test noop fetch negotiator'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+test_expect_success 'noop negotiator does not emit any "have"' '
+	rm -f trace &&
+
+	test_create_repo server &&
+	test_commit -C server to_fetch &&
+
+	test_create_repo client &&
+	test_commit -C client we_have &&
+
+	test_config -C client fetch.negotiationalgorithm noop &&
+	GIT_TRACE_PACKET="$(pwd)/trace" git -C client fetch "$(pwd)/server" &&
+
+	! grep "fetch> have" trace &&
+	grep "fetch> done" trace
+'
+
+test_done
diff --git a/t/t5555-http-smart-common.sh b/t/t5555-http-smart-common.sh
new file mode 100755
index 0000000..3dcb334
--- /dev/null
+++ b/t/t5555-http-smart-common.sh
@@ -0,0 +1,161 @@
+#!/bin/sh
+
+test_description='test functionality common to smart fetch & push'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+test_expect_success 'setup' '
+	test_commit --no-tag initial
+'
+
+test_expect_success 'git upload-pack --http-backend-info-refs and --advertise-refs are aliased' '
+	git upload-pack --http-backend-info-refs . >expected 2>err.expected &&
+	git upload-pack --advertise-refs . >actual 2>err.actual &&
+	test_cmp err.expected err.actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'git receive-pack --http-backend-info-refs and --advertise-refs are aliased' '
+	git receive-pack --http-backend-info-refs . >expected 2>err.expected &&
+	git receive-pack --advertise-refs . >actual 2>err.actual &&
+	test_cmp err.expected err.actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'git upload-pack --advertise-refs' '
+	cat >expect <<-EOF &&
+	$(git rev-parse HEAD) HEAD
+	$(git rev-parse HEAD) $(git symbolic-ref HEAD)
+	0000
+	EOF
+
+	# We only care about GIT_PROTOCOL, not GIT_TEST_PROTOCOL_VERSION
+	sane_unset GIT_PROTOCOL &&
+	GIT_TEST_PROTOCOL_VERSION=2 \
+	git upload-pack --advertise-refs . >out 2>err &&
+
+	test-tool pkt-line unpack <out >actual &&
+	test_must_be_empty err &&
+	test_cmp actual expect &&
+
+	# The --advertise-refs alias works
+	git upload-pack --advertise-refs . >out 2>err &&
+
+	test-tool pkt-line unpack <out >actual &&
+	test_must_be_empty err &&
+	test_cmp actual expect
+'
+
+test_expect_success 'git upload-pack --advertise-refs: v0' '
+	# With no specified protocol
+	cat >expect <<-EOF &&
+	$(git rev-parse HEAD) HEAD
+	$(git rev-parse HEAD) $(git symbolic-ref HEAD)
+	0000
+	EOF
+
+	git upload-pack --advertise-refs . >out 2>err &&
+	test-tool pkt-line unpack <out >actual &&
+	test_must_be_empty err &&
+	test_cmp actual expect &&
+
+	# With explicit v0
+	GIT_PROTOCOL=version=0 \
+	git upload-pack --advertise-refs . >out 2>err &&
+	test-tool pkt-line unpack <out >actual 2>err &&
+	test_must_be_empty err &&
+	test_cmp actual expect
+
+'
+
+test_expect_success 'git receive-pack --advertise-refs: v0' '
+	# With no specified protocol
+	cat >expect <<-EOF &&
+	$(git rev-parse HEAD) $(git symbolic-ref HEAD)
+	0000
+	EOF
+
+	git receive-pack --advertise-refs . >out 2>err &&
+	test-tool pkt-line unpack <out >actual &&
+	test_must_be_empty err &&
+	test_cmp actual expect &&
+
+	# With explicit v0
+	GIT_PROTOCOL=version=0 \
+	git receive-pack --advertise-refs . >out 2>err &&
+	test-tool pkt-line unpack <out >actual 2>err &&
+	test_must_be_empty err &&
+	test_cmp actual expect
+
+'
+
+test_expect_success 'git upload-pack --advertise-refs: v1' '
+	# With no specified protocol
+	cat >expect <<-EOF &&
+	version 1
+	$(git rev-parse HEAD) HEAD
+	$(git rev-parse HEAD) $(git symbolic-ref HEAD)
+	0000
+	EOF
+
+	GIT_PROTOCOL=version=1 \
+	git upload-pack --advertise-refs . >out &&
+
+	test-tool pkt-line unpack <out >actual 2>err &&
+	test_must_be_empty err &&
+	test_cmp actual expect
+'
+
+test_expect_success 'git receive-pack --advertise-refs: v1' '
+	# With no specified protocol
+	cat >expect <<-EOF &&
+	version 1
+	$(git rev-parse HEAD) $(git symbolic-ref HEAD)
+	0000
+	EOF
+
+	GIT_PROTOCOL=version=1 \
+	git receive-pack --advertise-refs . >out &&
+
+	test-tool pkt-line unpack <out >actual 2>err &&
+	test_must_be_empty err &&
+	test_cmp actual expect
+'
+
+test_expect_success 'git upload-pack --advertise-refs: v2' '
+	cat >expect <<-EOF &&
+	version 2
+	agent=FAKE
+	ls-refs=unborn
+	fetch=shallow wait-for-done
+	server-option
+	object-format=$(test_oid algo)
+	0000
+	EOF
+
+	GIT_PROTOCOL=version=2 \
+	GIT_USER_AGENT=FAKE \
+	git upload-pack --advertise-refs . >out 2>err &&
+
+	test-tool pkt-line unpack <out >actual &&
+	test_must_be_empty err &&
+	test_cmp actual expect
+'
+
+test_expect_success 'git receive-pack --advertise-refs: v2' '
+	# There is no v2 yet for receive-pack, implicit v0
+	cat >expect <<-EOF &&
+	$(git rev-parse HEAD) $(git symbolic-ref HEAD)
+	0000
+	EOF
+
+	GIT_PROTOCOL=version=2 \
+	git receive-pack --advertise-refs . >out 2>err &&
+
+	test-tool pkt-line unpack <out >actual &&
+	test_must_be_empty err &&
+	test_cmp actual expect
+'
+
+test_done
diff --git a/t/t5557-http-get.sh b/t/t5557-http-get.sh
new file mode 100755
index 0000000..76a4bbd
--- /dev/null
+++ b/t/t5557-http-get.sh
@@ -0,0 +1,39 @@
+#!/bin/sh
+
+test_description='test downloading a file by URL'
+
+TEST_PASSES_SANITIZE_LEAK=true
+
+. ./test-lib.sh
+
+. "$TEST_DIRECTORY"/lib-httpd.sh
+start_httpd
+
+test_expect_success 'get by URL: 404' '
+	test_when_finished "rm -f file.temp" &&
+	url="$HTTPD_URL/none.txt" &&
+	cat >input <<-EOF &&
+	capabilities
+	get $url file1
+	EOF
+
+	test_must_fail git remote-http $url <input 2>err &&
+	test_path_is_missing file1 &&
+	grep "failed to download file at URL" err
+'
+
+test_expect_success 'get by URL: 200' '
+	echo data >"$HTTPD_DOCUMENT_ROOT_PATH/exists.txt" &&
+
+	url="$HTTPD_URL/exists.txt" &&
+	cat >input <<-EOF &&
+	capabilities
+	get $url file2
+
+	EOF
+
+	git remote-http $url <input &&
+	test_cmp "$HTTPD_DOCUMENT_ROOT_PATH/exists.txt" file2
+'
+
+test_done
diff --git a/t/t5558-clone-bundle-uri.sh b/t/t5558-clone-bundle-uri.sh
new file mode 100755
index 0000000..1ca5f74
--- /dev/null
+++ b/t/t5558-clone-bundle-uri.sh
@@ -0,0 +1,1076 @@
+#!/bin/sh
+
+test_description='test fetching bundles with --bundle-uri'
+
+. ./test-lib.sh
+
+test_expect_success 'fail to clone from non-existent file' '
+	test_when_finished rm -rf test &&
+	git clone --bundle-uri="$(pwd)/does-not-exist" . test 2>err &&
+	grep "failed to download bundle from URI" err
+'
+
+test_expect_success 'fail to clone from non-bundle file' '
+	test_when_finished rm -rf test &&
+	echo bogus >bogus &&
+	git clone --bundle-uri="$(pwd)/bogus" . test 2>err &&
+	grep "is not a bundle" err
+'
+
+test_expect_success 'create bundle' '
+	git init clone-from &&
+	git -C clone-from checkout -b topic &&
+	test_commit -C clone-from A &&
+	test_commit -C clone-from B &&
+	git -C clone-from bundle create B.bundle topic
+'
+
+test_expect_success 'clone with path bundle' '
+	git clone --bundle-uri="clone-from/B.bundle" \
+		clone-from clone-path &&
+	git -C clone-path rev-parse refs/bundles/topic >actual &&
+	git -C clone-from rev-parse topic >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'clone with path bundle and non-default hash' '
+	test_when_finished "rm -rf clone-path-non-default-hash" &&
+	GIT_DEFAULT_HASH=sha256 git clone --bundle-uri="clone-from/B.bundle" \
+		clone-from clone-path-non-default-hash &&
+	git -C clone-path-non-default-hash rev-parse refs/bundles/topic >actual &&
+	git -C clone-from rev-parse topic >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'clone with file:// bundle' '
+	git clone --bundle-uri="file://$(pwd)/clone-from/B.bundle" \
+		clone-from clone-file &&
+	git -C clone-file rev-parse refs/bundles/topic >actual &&
+	git -C clone-from rev-parse topic >expect &&
+	test_cmp expect actual
+'
+
+# To get interesting tests for bundle lists, we need to construct a
+# somewhat-interesting commit history.
+#
+# ---------------- bundle-4
+#
+#       4
+#      / \
+# ----|---|------- bundle-3
+#     |   |
+#     |   3
+#     |   |
+# ----|---|------- bundle-2
+#     |   |
+#     2   |
+#     |   |
+# ----|---|------- bundle-1
+#      \ /
+#       1
+#       |
+# (previous commits)
+test_expect_success 'construct incremental bundle list' '
+	(
+		cd clone-from &&
+		git checkout -b base &&
+		test_commit 1 &&
+		git checkout -b left &&
+		test_commit 2 &&
+		git checkout -b right base &&
+		test_commit 3 &&
+		git checkout -b merge left &&
+		git merge right -m "4" &&
+
+		git bundle create bundle-1.bundle base &&
+		git bundle create bundle-2.bundle base..left &&
+		git bundle create bundle-3.bundle base..right &&
+		git bundle create bundle-4.bundle merge --not left right
+	)
+'
+
+test_expect_success 'clone bundle list (file, no heuristic)' '
+	cat >bundle-list <<-EOF &&
+	[bundle]
+		version = 1
+		mode = all
+
+	[bundle "bundle-1"]
+		uri = file://$(pwd)/clone-from/bundle-1.bundle
+
+	[bundle "bundle-2"]
+		uri = file://$(pwd)/clone-from/bundle-2.bundle
+
+	[bundle "bundle-3"]
+		uri = file://$(pwd)/clone-from/bundle-3.bundle
+
+	[bundle "bundle-4"]
+		uri = file://$(pwd)/clone-from/bundle-4.bundle
+	EOF
+
+	git clone --bundle-uri="file://$(pwd)/bundle-list" \
+		clone-from clone-list-file 2>err &&
+	! grep "Repository lacks these prerequisite commits" err &&
+
+	git -C clone-from for-each-ref --format="%(objectname)" >oids &&
+	git -C clone-list-file cat-file --batch-check <oids &&
+
+	git -C clone-list-file for-each-ref --format="%(refname)" >refs &&
+	grep "refs/bundles/" refs >actual &&
+	cat >expect <<-\EOF &&
+	refs/bundles/base
+	refs/bundles/left
+	refs/bundles/merge
+	refs/bundles/right
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'clone bundle list (file, all mode, some failures)' '
+	cat >bundle-list <<-EOF &&
+	[bundle]
+		version = 1
+		mode = all
+
+	# Does not exist. Should be skipped.
+	[bundle "bundle-0"]
+		uri = file://$(pwd)/clone-from/bundle-0.bundle
+
+	[bundle "bundle-1"]
+		uri = file://$(pwd)/clone-from/bundle-1.bundle
+
+	[bundle "bundle-2"]
+		uri = file://$(pwd)/clone-from/bundle-2.bundle
+
+	# No bundle-3 means bundle-4 will not apply.
+
+	[bundle "bundle-4"]
+		uri = file://$(pwd)/clone-from/bundle-4.bundle
+
+	# Does not exist. Should be skipped.
+	[bundle "bundle-5"]
+		uri = file://$(pwd)/clone-from/bundle-5.bundle
+	EOF
+
+	GIT_TRACE2_PERF=1 \
+	git clone --bundle-uri="file://$(pwd)/bundle-list" \
+		clone-from clone-all-some 2>err &&
+	! grep "Repository lacks these prerequisite commits" err &&
+	! grep "fatal" err &&
+	grep "warning: failed to download bundle from URI" err &&
+
+	git -C clone-from for-each-ref --format="%(objectname)" >oids &&
+	git -C clone-all-some cat-file --batch-check <oids &&
+
+	git -C clone-all-some for-each-ref --format="%(refname)" >refs &&
+	grep "refs/bundles/" refs >actual &&
+	cat >expect <<-\EOF &&
+	refs/bundles/base
+	refs/bundles/left
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'clone bundle list (file, all mode, all failures)' '
+	cat >bundle-list <<-EOF &&
+	[bundle]
+		version = 1
+		mode = all
+
+	# Does not exist. Should be skipped.
+	[bundle "bundle-0"]
+		uri = file://$(pwd)/clone-from/bundle-0.bundle
+
+	# Does not exist. Should be skipped.
+	[bundle "bundle-5"]
+		uri = file://$(pwd)/clone-from/bundle-5.bundle
+	EOF
+
+	git clone --bundle-uri="file://$(pwd)/bundle-list" \
+		clone-from clone-all-fail 2>err &&
+	! grep "Repository lacks these prerequisite commits" err &&
+	! grep "fatal" err &&
+	grep "warning: failed to download bundle from URI" err &&
+
+	git -C clone-from for-each-ref --format="%(objectname)" >oids &&
+	git -C clone-all-fail cat-file --batch-check <oids &&
+
+	git -C clone-all-fail for-each-ref --format="%(refname)" >refs &&
+	! grep "refs/bundles/" refs
+'
+
+test_expect_success 'clone bundle list (file, any mode)' '
+	cat >bundle-list <<-EOF &&
+	[bundle]
+		version = 1
+		mode = any
+
+	# Does not exist. Should be skipped.
+	[bundle "bundle-0"]
+		uri = file://$(pwd)/clone-from/bundle-0.bundle
+
+	[bundle "bundle-1"]
+		uri = file://$(pwd)/clone-from/bundle-1.bundle
+
+	# Does not exist. Should be skipped.
+	[bundle "bundle-5"]
+		uri = file://$(pwd)/clone-from/bundle-5.bundle
+	EOF
+
+	git clone --bundle-uri="file://$(pwd)/bundle-list" \
+		clone-from clone-any-file 2>err &&
+	! grep "Repository lacks these prerequisite commits" err &&
+
+	git -C clone-from for-each-ref --format="%(objectname)" >oids &&
+	git -C clone-any-file cat-file --batch-check <oids &&
+
+	git -C clone-any-file for-each-ref --format="%(refname)" >refs &&
+	grep "refs/bundles/" refs >actual &&
+	cat >expect <<-\EOF &&
+	refs/bundles/base
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'clone bundle list (file, any mode, all failures)' '
+	cat >bundle-list <<-EOF &&
+	[bundle]
+		version = 1
+		mode = any
+
+	# Does not exist. Should be skipped.
+	[bundle "bundle-0"]
+		uri = $HTTPD_URL/bundle-0.bundle
+
+	# Does not exist. Should be skipped.
+	[bundle "bundle-5"]
+		uri = $HTTPD_URL/bundle-5.bundle
+	EOF
+
+	git clone --bundle-uri="file://$(pwd)/bundle-list" \
+		clone-from clone-any-fail 2>err &&
+	! grep "fatal" err &&
+	grep "warning: failed to download bundle from URI" err &&
+
+	git -C clone-from for-each-ref --format="%(objectname)" >oids &&
+	git -C clone-any-fail cat-file --batch-check <oids &&
+
+	git -C clone-any-fail for-each-ref --format="%(refname)" >refs &&
+	! grep "refs/bundles/" refs
+'
+
+#########################################################################
+# HTTP tests begin here
+
+. "$TEST_DIRECTORY"/lib-httpd.sh
+start_httpd
+
+test_expect_success 'fail to fetch from non-existent HTTP URL' '
+	test_when_finished rm -rf test &&
+	git clone --bundle-uri="$HTTPD_URL/does-not-exist" . test 2>err &&
+	grep "failed to download bundle from URI" err
+'
+
+test_expect_success 'fail to fetch from non-bundle HTTP URL' '
+	test_when_finished rm -rf test &&
+	echo bogus >"$HTTPD_DOCUMENT_ROOT_PATH/bogus" &&
+	git clone --bundle-uri="$HTTPD_URL/bogus" . test 2>err &&
+	grep "is not a bundle" err
+'
+
+test_expect_success 'clone HTTP bundle' '
+	cp clone-from/B.bundle "$HTTPD_DOCUMENT_ROOT_PATH/B.bundle" &&
+
+	git clone --no-local --mirror clone-from \
+		"$HTTPD_DOCUMENT_ROOT_PATH/fetch.git" &&
+
+	git clone --bundle-uri="$HTTPD_URL/B.bundle" \
+		"$HTTPD_URL/smart/fetch.git" clone-http &&
+	git -C clone-http rev-parse refs/bundles/topic >actual &&
+	git -C clone-from rev-parse topic >expect &&
+	test_cmp expect actual &&
+
+	test_config -C clone-http log.excludedecoration refs/bundle/
+'
+
+test_expect_success 'clone HTTP bundle with non-default hash' '
+	test_when_finished "rm -rf clone-http-non-default-hash" &&
+	GIT_DEFAULT_HASH=sha256 git clone --bundle-uri="$HTTPD_URL/B.bundle" \
+		"$HTTPD_URL/smart/fetch.git" clone-http-non-default-hash &&
+	git -C clone-http-non-default-hash rev-parse refs/bundles/topic >actual &&
+	git -C clone-from rev-parse topic >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'clone bundle list (HTTP, no heuristic)' '
+	test_when_finished rm -f trace*.txt &&
+
+	cp clone-from/bundle-*.bundle "$HTTPD_DOCUMENT_ROOT_PATH/" &&
+	cat >"$HTTPD_DOCUMENT_ROOT_PATH/bundle-list" <<-EOF &&
+	[bundle]
+		version = 1
+		mode = all
+
+	[bundle "bundle-1"]
+		uri = $HTTPD_URL/bundle-1.bundle
+
+	[bundle "bundle-2"]
+		uri = $HTTPD_URL/bundle-2.bundle
+
+	[bundle "bundle-3"]
+		uri = $HTTPD_URL/bundle-3.bundle
+
+	[bundle "bundle-4"]
+		uri = $HTTPD_URL/bundle-4.bundle
+	EOF
+
+	GIT_TRACE2_EVENT="$(pwd)/trace-clone.txt" \
+		git clone --bundle-uri="$HTTPD_URL/bundle-list" \
+		clone-from clone-list-http  2>err &&
+	! grep "Repository lacks these prerequisite commits" err &&
+
+	git -C clone-from for-each-ref --format="%(objectname)" >oids &&
+	git -C clone-list-http cat-file --batch-check <oids &&
+
+	cat >expect <<-EOF &&
+	$HTTPD_URL/bundle-1.bundle
+	$HTTPD_URL/bundle-2.bundle
+	$HTTPD_URL/bundle-3.bundle
+	$HTTPD_URL/bundle-4.bundle
+	$HTTPD_URL/bundle-list
+	EOF
+
+	# Sort the list, since the order is not well-defined
+	# without a heuristic.
+	test_remote_https_urls <trace-clone.txt | sort >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'clone bundle list (HTTP, any mode)' '
+	cp clone-from/bundle-*.bundle "$HTTPD_DOCUMENT_ROOT_PATH/" &&
+	cat >"$HTTPD_DOCUMENT_ROOT_PATH/bundle-list" <<-EOF &&
+	[bundle]
+		version = 1
+		mode = any
+
+	# Does not exist. Should be skipped.
+	[bundle "bundle-0"]
+		uri = $HTTPD_URL/bundle-0.bundle
+
+	[bundle "bundle-1"]
+		uri = $HTTPD_URL/bundle-1.bundle
+
+	# Does not exist. Should be skipped.
+	[bundle "bundle-5"]
+		uri = $HTTPD_URL/bundle-5.bundle
+	EOF
+
+	git clone --bundle-uri="$HTTPD_URL/bundle-list" \
+		clone-from clone-any-http 2>err &&
+	! grep "fatal" err &&
+	grep "warning: failed to download bundle from URI" err &&
+
+	git -C clone-from for-each-ref --format="%(objectname)" >oids &&
+	git -C clone-any-http cat-file --batch-check <oids &&
+
+	git -C clone-list-file for-each-ref --format="%(refname)" >refs &&
+	grep "refs/bundles/" refs >actual &&
+	cat >expect <<-\EOF &&
+	refs/bundles/base
+	refs/bundles/left
+	refs/bundles/merge
+	refs/bundles/right
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'clone bundle list (http, creationToken)' '
+	test_when_finished rm -f trace*.txt &&
+
+	cp clone-from/bundle-*.bundle "$HTTPD_DOCUMENT_ROOT_PATH/" &&
+	cat >"$HTTPD_DOCUMENT_ROOT_PATH/bundle-list" <<-EOF &&
+	[bundle]
+		version = 1
+		mode = all
+		heuristic = creationToken
+
+	[bundle "bundle-1"]
+		uri = bundle-1.bundle
+		creationToken = 1
+
+	[bundle "bundle-2"]
+		uri = bundle-2.bundle
+		creationToken = 2
+
+	[bundle "bundle-3"]
+		uri = bundle-3.bundle
+		creationToken = 3
+
+	[bundle "bundle-4"]
+		uri = bundle-4.bundle
+		creationToken = 4
+	EOF
+
+	GIT_TRACE2_EVENT="$(pwd)/trace-clone.txt" git \
+		clone --bundle-uri="$HTTPD_URL/bundle-list" \
+		"$HTTPD_URL/smart/fetch.git" clone-list-http-2 &&
+
+	git -C clone-from for-each-ref --format="%(objectname)" >oids &&
+	git -C clone-list-http-2 cat-file --batch-check <oids &&
+
+	cat >expect <<-EOF &&
+	$HTTPD_URL/bundle-list
+	$HTTPD_URL/bundle-4.bundle
+	$HTTPD_URL/bundle-3.bundle
+	$HTTPD_URL/bundle-2.bundle
+	$HTTPD_URL/bundle-1.bundle
+	EOF
+
+	test_remote_https_urls <trace-clone.txt >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'clone incomplete bundle list (http, creationToken)' '
+	test_when_finished rm -f trace*.txt &&
+
+	cp clone-from/bundle-*.bundle "$HTTPD_DOCUMENT_ROOT_PATH/" &&
+	cat >"$HTTPD_DOCUMENT_ROOT_PATH/bundle-list" <<-EOF &&
+	[bundle]
+		version = 1
+		mode = all
+		heuristic = creationToken
+
+	[bundle "bundle-1"]
+		uri = bundle-1.bundle
+		creationToken = 1
+	EOF
+
+	GIT_TRACE2_EVENT=$(pwd)/trace-clone.txt \
+	git clone --bundle-uri="$HTTPD_URL/bundle-list" \
+		--single-branch --branch=base --no-tags \
+		"$HTTPD_URL/smart/fetch.git" clone-token-http &&
+
+	test_cmp_config -C clone-token-http "$HTTPD_URL/bundle-list" fetch.bundleuri &&
+	test_cmp_config -C clone-token-http 1 fetch.bundlecreationtoken &&
+
+	cat >expect <<-EOF &&
+	$HTTPD_URL/bundle-list
+	$HTTPD_URL/bundle-1.bundle
+	EOF
+
+	test_remote_https_urls <trace-clone.txt >actual &&
+	test_cmp expect actual &&
+
+	# We now have only one bundle ref.
+	git -C clone-token-http for-each-ref --format="%(refname)" "refs/bundles/*" >refs &&
+	cat >expect <<-\EOF &&
+	refs/bundles/base
+	EOF
+	test_cmp expect refs &&
+
+	# Add remaining bundles, exercising the "deepening" strategy
+	# for downloading via the creationToken heurisitc.
+	cat >>"$HTTPD_DOCUMENT_ROOT_PATH/bundle-list" <<-EOF &&
+	[bundle "bundle-2"]
+		uri = bundle-2.bundle
+		creationToken = 2
+
+	[bundle "bundle-3"]
+		uri = bundle-3.bundle
+		creationToken = 3
+
+	[bundle "bundle-4"]
+		uri = bundle-4.bundle
+		creationToken = 4
+	EOF
+
+	GIT_TRACE2_EVENT="$(pwd)/trace1.txt" \
+		git -C clone-token-http fetch origin --no-tags \
+		refs/heads/merge:refs/heads/merge &&
+	test_cmp_config -C clone-token-http 4 fetch.bundlecreationtoken &&
+
+	cat >expect <<-EOF &&
+	$HTTPD_URL/bundle-list
+	$HTTPD_URL/bundle-4.bundle
+	$HTTPD_URL/bundle-3.bundle
+	$HTTPD_URL/bundle-2.bundle
+	EOF
+
+	test_remote_https_urls <trace1.txt >actual &&
+	test_cmp expect actual &&
+
+	# We now have all bundle refs.
+	git -C clone-token-http for-each-ref --format="%(refname)" "refs/bundles/*" >refs &&
+
+	cat >expect <<-\EOF &&
+	refs/bundles/base
+	refs/bundles/left
+	refs/bundles/merge
+	refs/bundles/right
+	EOF
+	test_cmp expect refs
+'
+
+test_expect_success 'http clone with bundle.heuristic creates fetch.bundleURI' '
+	test_when_finished rm -rf fetch-http-4 trace*.txt &&
+
+	cat >"$HTTPD_DOCUMENT_ROOT_PATH/bundle-list" <<-EOF &&
+	[bundle]
+		version = 1
+		mode = all
+		heuristic = creationToken
+
+	[bundle "bundle-1"]
+		uri = bundle-1.bundle
+		creationToken = 1
+	EOF
+
+	GIT_TRACE2_EVENT="$(pwd)/trace-clone.txt" \
+	git clone --single-branch --branch=base \
+		--bundle-uri="$HTTPD_URL/bundle-list" \
+		"$HTTPD_URL/smart/fetch.git" fetch-http-4 &&
+
+	test_cmp_config -C fetch-http-4 "$HTTPD_URL/bundle-list" fetch.bundleuri &&
+	test_cmp_config -C fetch-http-4 1 fetch.bundlecreationtoken &&
+
+	cat >expect <<-EOF &&
+	$HTTPD_URL/bundle-list
+	$HTTPD_URL/bundle-1.bundle
+	EOF
+
+	test_remote_https_urls <trace-clone.txt >actual &&
+	test_cmp expect actual &&
+
+	# only received base ref from bundle-1
+	git -C fetch-http-4 for-each-ref --format="%(refname)" "refs/bundles/*" >refs &&
+	cat >expect <<-\EOF &&
+	refs/bundles/base
+	EOF
+	test_cmp expect refs &&
+
+	cat >>"$HTTPD_DOCUMENT_ROOT_PATH/bundle-list" <<-EOF &&
+	[bundle "bundle-2"]
+		uri = bundle-2.bundle
+		creationToken = 2
+	EOF
+
+	# Fetch the objects for bundle-2 _and_ bundle-3.
+	GIT_TRACE2_EVENT="$(pwd)/trace1.txt" \
+		git -C fetch-http-4 fetch origin --no-tags \
+		refs/heads/left:refs/heads/left \
+		refs/heads/right:refs/heads/right &&
+	test_cmp_config -C fetch-http-4 2 fetch.bundlecreationtoken &&
+
+	cat >expect <<-EOF &&
+	$HTTPD_URL/bundle-list
+	$HTTPD_URL/bundle-2.bundle
+	EOF
+
+	test_remote_https_urls <trace1.txt >actual &&
+	test_cmp expect actual &&
+
+	# received left from bundle-2
+	git -C fetch-http-4 for-each-ref --format="%(refname)" "refs/bundles/*" >refs &&
+	cat >expect <<-\EOF &&
+	refs/bundles/base
+	refs/bundles/left
+	EOF
+	test_cmp expect refs &&
+
+	# No-op fetch
+	GIT_TRACE2_EVENT="$(pwd)/trace1b.txt" \
+		git -C fetch-http-4 fetch origin --no-tags \
+		refs/heads/left:refs/heads/left \
+		refs/heads/right:refs/heads/right &&
+
+	cat >expect <<-EOF &&
+	$HTTPD_URL/bundle-list
+	EOF
+	test_remote_https_urls <trace1b.txt >actual &&
+	test_cmp expect actual &&
+
+	cat >>"$HTTPD_DOCUMENT_ROOT_PATH/bundle-list" <<-EOF &&
+	[bundle "bundle-3"]
+		uri = bundle-3.bundle
+		creationToken = 3
+
+	[bundle "bundle-4"]
+		uri = bundle-4.bundle
+		creationToken = 4
+	EOF
+
+	# This fetch should skip bundle-3.bundle, since its objects are
+	# already local (we have the requisite commits for bundle-4.bundle).
+	GIT_TRACE2_EVENT="$(pwd)/trace2.txt" \
+		git -C fetch-http-4 fetch origin --no-tags \
+		refs/heads/merge:refs/heads/merge &&
+	test_cmp_config -C fetch-http-4 4 fetch.bundlecreationtoken &&
+
+	cat >expect <<-EOF &&
+	$HTTPD_URL/bundle-list
+	$HTTPD_URL/bundle-4.bundle
+	EOF
+
+	test_remote_https_urls <trace2.txt >actual &&
+	test_cmp expect actual &&
+
+	# received merge ref from bundle-4, but right is missing
+	# because we did not download bundle-3.
+	git -C fetch-http-4 for-each-ref --format="%(refname)" "refs/bundles/*" >refs &&
+
+	cat >expect <<-\EOF &&
+	refs/bundles/base
+	refs/bundles/left
+	refs/bundles/merge
+	EOF
+	test_cmp expect refs &&
+
+	# No-op fetch
+	GIT_TRACE2_EVENT="$(pwd)/trace2b.txt" \
+		git -C fetch-http-4 fetch origin &&
+
+	cat >expect <<-EOF &&
+	$HTTPD_URL/bundle-list
+	EOF
+	test_remote_https_urls <trace2b.txt >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'creationToken heuristic with failed downloads (clone)' '
+	test_when_finished rm -rf download-* trace*.txt &&
+
+	# Case 1: base bundle does not exist, nothing can unbundle
+	cat >"$HTTPD_DOCUMENT_ROOT_PATH/bundle-list" <<-EOF &&
+	[bundle]
+		version = 1
+		mode = all
+		heuristic = creationToken
+
+	[bundle "bundle-1"]
+		uri = fake.bundle
+		creationToken = 1
+
+	[bundle "bundle-2"]
+		uri = bundle-2.bundle
+		creationToken = 2
+
+	[bundle "bundle-3"]
+		uri = bundle-3.bundle
+		creationToken = 3
+
+	[bundle "bundle-4"]
+		uri = bundle-4.bundle
+		creationToken = 4
+	EOF
+
+	GIT_TRACE2_EVENT="$(pwd)/trace-clone-1.txt" \
+	git clone --single-branch --branch=base \
+		--bundle-uri="$HTTPD_URL/bundle-list" \
+		"$HTTPD_URL/smart/fetch.git" download-1 &&
+
+	# Bundle failure does not set these configs.
+	test_must_fail git -C download-1 config fetch.bundleuri &&
+	test_must_fail git -C download-1 config fetch.bundlecreationtoken &&
+
+	cat >expect <<-EOF &&
+	$HTTPD_URL/bundle-list
+	$HTTPD_URL/bundle-4.bundle
+	$HTTPD_URL/bundle-3.bundle
+	$HTTPD_URL/bundle-2.bundle
+	$HTTPD_URL/fake.bundle
+	EOF
+	test_remote_https_urls <trace-clone-1.txt >actual &&
+	test_cmp expect actual &&
+
+	# All bundles failed to unbundle
+	git -C download-1 for-each-ref --format="%(refname)" "refs/bundles/*" >refs &&
+	test_must_be_empty refs &&
+
+	# Case 2: middle bundle does not exist, only two bundles can unbundle
+	cat >"$HTTPD_DOCUMENT_ROOT_PATH/bundle-list" <<-EOF &&
+	[bundle]
+		version = 1
+		mode = all
+		heuristic = creationToken
+
+	[bundle "bundle-1"]
+		uri = bundle-1.bundle
+		creationToken = 1
+
+	[bundle "bundle-2"]
+		uri = fake.bundle
+		creationToken = 2
+
+	[bundle "bundle-3"]
+		uri = bundle-3.bundle
+		creationToken = 3
+
+	[bundle "bundle-4"]
+		uri = bundle-4.bundle
+		creationToken = 4
+	EOF
+
+	GIT_TRACE2_EVENT="$(pwd)/trace-clone-2.txt" \
+	git clone --single-branch --branch=base \
+		--bundle-uri="$HTTPD_URL/bundle-list" \
+		"$HTTPD_URL/smart/fetch.git" download-2 &&
+
+	# Bundle failure does not set these configs.
+	test_must_fail git -C download-2 config fetch.bundleuri &&
+	test_must_fail git -C download-2 config fetch.bundlecreationtoken &&
+
+	cat >expect <<-EOF &&
+	$HTTPD_URL/bundle-list
+	$HTTPD_URL/bundle-4.bundle
+	$HTTPD_URL/bundle-3.bundle
+	$HTTPD_URL/fake.bundle
+	$HTTPD_URL/bundle-1.bundle
+	EOF
+	test_remote_https_urls <trace-clone-2.txt >actual &&
+	test_cmp expect actual &&
+
+	# bundle-1 and bundle-3 could unbundle, but bundle-4 could not
+	git -C download-2 for-each-ref --format="%(refname)" "refs/bundles/*" >refs &&
+	cat >expect <<-EOF &&
+	refs/bundles/base
+	refs/bundles/right
+	EOF
+	test_cmp expect refs &&
+
+	# Case 3: top bundle does not exist, rest unbundle fine.
+	cat >"$HTTPD_DOCUMENT_ROOT_PATH/bundle-list" <<-EOF &&
+	[bundle]
+		version = 1
+		mode = all
+		heuristic = creationToken
+
+	[bundle "bundle-1"]
+		uri = bundle-1.bundle
+		creationToken = 1
+
+	[bundle "bundle-2"]
+		uri = bundle-2.bundle
+		creationToken = 2
+
+	[bundle "bundle-3"]
+		uri = bundle-3.bundle
+		creationToken = 3
+
+	[bundle "bundle-4"]
+		uri = fake.bundle
+		creationToken = 4
+	EOF
+
+	GIT_TRACE2_EVENT="$(pwd)/trace-clone-3.txt" \
+	git clone --single-branch --branch=base \
+		--bundle-uri="$HTTPD_URL/bundle-list" \
+		"$HTTPD_URL/smart/fetch.git" download-3 &&
+
+	# As long as we have continguous successful downloads,
+	# we _do_ set these configs.
+	test_cmp_config -C download-3 "$HTTPD_URL/bundle-list" fetch.bundleuri &&
+	test_cmp_config -C download-3 3 fetch.bundlecreationtoken &&
+
+	cat >expect <<-EOF &&
+	$HTTPD_URL/bundle-list
+	$HTTPD_URL/fake.bundle
+	$HTTPD_URL/bundle-3.bundle
+	$HTTPD_URL/bundle-2.bundle
+	$HTTPD_URL/bundle-1.bundle
+	EOF
+	test_remote_https_urls <trace-clone-3.txt >actual &&
+	test_cmp expect actual &&
+
+	# fake.bundle did not unbundle, but the others did.
+	git -C download-3 for-each-ref --format="%(refname)" "refs/bundles/*" >refs &&
+	cat >expect <<-EOF &&
+	refs/bundles/base
+	refs/bundles/left
+	refs/bundles/right
+	EOF
+	test_cmp expect refs
+'
+
+# Expand the bundle list to include other interesting shapes, specifically
+# interesting for use when fetching from a previous state.
+#
+# ---------------- bundle-7
+#       7
+#     _/|\_
+# ---/--|--\------ bundle-6
+#   5   |   6
+# --|---|---|----- bundle-4
+#   |   4   |
+#   |  / \  /
+# --|-|---|/------ bundle-3 (the client will be caught up to this point.)
+#   \ |   3
+# ---\|---|------- bundle-2
+#     2   |
+# ----|---|------- bundle-1
+#      \ /
+#       1
+#       |
+# (previous commits)
+test_expect_success 'expand incremental bundle list' '
+	(
+		cd clone-from &&
+		git checkout -b lefter left &&
+		test_commit 5 &&
+		git checkout -b righter right &&
+		test_commit 6 &&
+		git checkout -b top lefter &&
+		git merge -m "7" merge righter &&
+
+		git bundle create bundle-6.bundle lefter righter --not left right &&
+		git bundle create bundle-7.bundle top --not lefter merge righter &&
+
+		cp bundle-*.bundle "$HTTPD_DOCUMENT_ROOT_PATH/"
+	) &&
+	git -C "$HTTPD_DOCUMENT_ROOT_PATH/fetch.git" fetch origin +refs/heads/*:refs/heads/*
+'
+
+test_expect_success 'creationToken heuristic with failed downloads (fetch)' '
+	test_when_finished rm -rf download-* trace*.txt &&
+
+	cat >"$HTTPD_DOCUMENT_ROOT_PATH/bundle-list" <<-EOF &&
+	[bundle]
+		version = 1
+		mode = all
+		heuristic = creationToken
+
+	[bundle "bundle-1"]
+		uri = bundle-1.bundle
+		creationToken = 1
+
+	[bundle "bundle-2"]
+		uri = bundle-2.bundle
+		creationToken = 2
+
+	[bundle "bundle-3"]
+		uri = bundle-3.bundle
+		creationToken = 3
+	EOF
+
+	git clone --single-branch --branch=left \
+		--bundle-uri="$HTTPD_URL/bundle-list" \
+		"$HTTPD_URL/smart/fetch.git" fetch-base &&
+	test_cmp_config -C fetch-base "$HTTPD_URL/bundle-list" fetch.bundleURI &&
+	test_cmp_config -C fetch-base 3 fetch.bundleCreationToken &&
+
+	# Case 1: all bundles exist: successful unbundling of all bundles
+	cat >"$HTTPD_DOCUMENT_ROOT_PATH/bundle-list" <<-EOF &&
+	[bundle]
+		version = 1
+		mode = all
+		heuristic = creationToken
+
+	[bundle "bundle-1"]
+		uri = bundle-1.bundle
+		creationToken = 1
+
+	[bundle "bundle-2"]
+		uri = bundle-2.bundle
+		creationToken = 2
+
+	[bundle "bundle-3"]
+		uri = bundle-3.bundle
+		creationToken = 3
+
+	[bundle "bundle-4"]
+		uri = bundle-4.bundle
+		creationToken = 4
+
+	[bundle "bundle-6"]
+		uri = bundle-6.bundle
+		creationToken = 6
+
+	[bundle "bundle-7"]
+		uri = bundle-7.bundle
+		creationToken = 7
+	EOF
+
+	cp -r fetch-base fetch-1 &&
+	GIT_TRACE2_EVENT="$(pwd)/trace-fetch-1.txt" \
+		git -C fetch-1 fetch origin &&
+	test_cmp_config -C fetch-1 7 fetch.bundlecreationtoken &&
+
+	cat >expect <<-EOF &&
+	$HTTPD_URL/bundle-list
+	$HTTPD_URL/bundle-7.bundle
+	$HTTPD_URL/bundle-6.bundle
+	$HTTPD_URL/bundle-4.bundle
+	EOF
+	test_remote_https_urls <trace-fetch-1.txt >actual &&
+	test_cmp expect actual &&
+
+	# Check which bundles have unbundled by refs
+	git -C fetch-1 for-each-ref --format="%(refname)" "refs/bundles/*" >refs &&
+	cat >expect <<-EOF &&
+	refs/bundles/base
+	refs/bundles/left
+	refs/bundles/lefter
+	refs/bundles/merge
+	refs/bundles/right
+	refs/bundles/righter
+	refs/bundles/top
+	EOF
+	test_cmp expect refs &&
+
+	# Case 2: middle bundle does not exist, only bundle-4 can unbundle
+	cat >"$HTTPD_DOCUMENT_ROOT_PATH/bundle-list" <<-EOF &&
+	[bundle]
+		version = 1
+		mode = all
+		heuristic = creationToken
+
+	[bundle "bundle-1"]
+		uri = bundle-1.bundle
+		creationToken = 1
+
+	[bundle "bundle-2"]
+		uri = bundle-2.bundle
+		creationToken = 2
+
+	[bundle "bundle-3"]
+		uri = bundle-3.bundle
+		creationToken = 3
+
+	[bundle "bundle-4"]
+		uri = bundle-4.bundle
+		creationToken = 4
+
+	[bundle "bundle-6"]
+		uri = fake.bundle
+		creationToken = 6
+
+	[bundle "bundle-7"]
+		uri = bundle-7.bundle
+		creationToken = 7
+	EOF
+
+	cp -r fetch-base fetch-2 &&
+	GIT_TRACE2_EVENT="$(pwd)/trace-fetch-2.txt" \
+		git -C fetch-2 fetch origin &&
+
+	# Since bundle-7 fails to unbundle, do not update creation token.
+	test_cmp_config -C fetch-2 3 fetch.bundlecreationtoken &&
+
+	cat >expect <<-EOF &&
+	$HTTPD_URL/bundle-list
+	$HTTPD_URL/bundle-7.bundle
+	$HTTPD_URL/fake.bundle
+	$HTTPD_URL/bundle-4.bundle
+	EOF
+	test_remote_https_urls <trace-fetch-2.txt >actual &&
+	test_cmp expect actual &&
+
+	# Check which bundles have unbundled by refs
+	git -C fetch-2 for-each-ref --format="%(refname)" "refs/bundles/*" >refs &&
+	cat >expect <<-EOF &&
+	refs/bundles/base
+	refs/bundles/left
+	refs/bundles/merge
+	refs/bundles/right
+	EOF
+	test_cmp expect refs &&
+
+	# Case 3: top bundle does not exist, rest unbundle fine.
+	cat >"$HTTPD_DOCUMENT_ROOT_PATH/bundle-list" <<-EOF &&
+	[bundle]
+		version = 1
+		mode = all
+		heuristic = creationToken
+
+	[bundle "bundle-1"]
+		uri = bundle-1.bundle
+		creationToken = 1
+
+	[bundle "bundle-2"]
+		uri = bundle-2.bundle
+		creationToken = 2
+
+	[bundle "bundle-3"]
+		uri = bundle-3.bundle
+		creationToken = 3
+
+	[bundle "bundle-4"]
+		uri = bundle-4.bundle
+		creationToken = 4
+
+	[bundle "bundle-6"]
+		uri = bundle-6.bundle
+		creationToken = 6
+
+	[bundle "bundle-7"]
+		uri = fake.bundle
+		creationToken = 7
+	EOF
+
+	cp -r fetch-base fetch-3 &&
+	GIT_TRACE2_EVENT="$(pwd)/trace-fetch-3.txt" \
+		git -C fetch-3 fetch origin &&
+
+	# As long as we have continguous successful downloads,
+	# we _do_ set the maximum creation token.
+	test_cmp_config -C fetch-3 6 fetch.bundlecreationtoken &&
+
+	# NOTE: the fetch skips bundle-4 since bundle-6 successfully
+	# unbundles itself and bundle-7 failed to download.
+	cat >expect <<-EOF &&
+	$HTTPD_URL/bundle-list
+	$HTTPD_URL/fake.bundle
+	$HTTPD_URL/bundle-6.bundle
+	EOF
+	test_remote_https_urls <trace-fetch-3.txt >actual &&
+	test_cmp expect actual &&
+
+	# Check which bundles have unbundled by refs
+	git -C fetch-3 for-each-ref --format="%(refname)" "refs/bundles/*" >refs &&
+	cat >expect <<-EOF &&
+	refs/bundles/base
+	refs/bundles/left
+	refs/bundles/lefter
+	refs/bundles/right
+	refs/bundles/righter
+	EOF
+	test_cmp expect refs
+'
+
+test_expect_success 'bundles are downloaded once during fetch --all' '
+	test_when_finished rm -rf download-* trace*.txt fetch-mult &&
+
+	cat >"$HTTPD_DOCUMENT_ROOT_PATH/bundle-list" <<-EOF &&
+	[bundle]
+		version = 1
+		mode = all
+		heuristic = creationToken
+
+	[bundle "bundle-1"]
+		uri = bundle-1.bundle
+		creationToken = 1
+
+	[bundle "bundle-2"]
+		uri = bundle-2.bundle
+		creationToken = 2
+
+	[bundle "bundle-3"]
+		uri = bundle-3.bundle
+		creationToken = 3
+	EOF
+
+	git clone --single-branch --branch=left \
+		--bundle-uri="$HTTPD_URL/bundle-list" \
+		"$HTTPD_URL/smart/fetch.git" fetch-mult &&
+	git -C fetch-mult remote add dup1 "$HTTPD_URL/smart/fetch.git" &&
+	git -C fetch-mult remote add dup2 "$HTTPD_URL/smart/fetch.git" &&
+
+	GIT_TRACE2_EVENT="$(pwd)/trace-mult.txt" \
+		git -C fetch-mult fetch --all &&
+	grep "\"child_start\".*\"git-remote-https\",\"$HTTPD_URL/bundle-list\"" \
+		trace-mult.txt >bundle-fetches &&
+	test_line_count = 1 bundle-fetches
+'
+# Do not add tests here unless they use the HTTP server, as they will
+# not run unless the HTTP dependencies exist.
+
+test_done
diff --git a/t/t5559-http-fetch-smart-http2.sh b/t/t5559-http-fetch-smart-http2.sh
new file mode 100755
index 0000000..54aa9d3
--- /dev/null
+++ b/t/t5559-http-fetch-smart-http2.sh
@@ -0,0 +1,5 @@
+#!/bin/sh
+
+HTTP_PROTO=HTTP/2
+LIB_HTTPD_SSL=1
+. ./t5551-http-fetch-smart.sh
diff --git a/t/t5560-http-backend-noserver.sh b/t/t5560-http-backend-noserver.sh
index 9fafcf1..f75068d 100755
--- a/t/t5560-http-backend-noserver.sh
+++ b/t/t5560-http-backend-noserver.sh
@@ -1,6 +1,10 @@
 #!/bin/sh
 
 test_description='test git-http-backend-noserver'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 HTTPD_DOCUMENT_ROOT_PATH="$TRASH_DIRECTORY"
diff --git a/t/t5561-http-backend.sh b/t/t5561-http-backend.sh
index 6eb0294..e1d3b8c 100755
--- a/t/t5561-http-backend.sh
+++ b/t/t5561-http-backend.sh
@@ -1,6 +1,10 @@
 #!/bin/sh
 
 test_description='test git-http-backend'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-httpd.sh
 
@@ -39,9 +43,9 @@ POST() {
 
 grep '^[^#]' >exp <<EOF
 
-###  refs/heads/master
+###  refs/heads/main
 ###
-GET  /smart/repo.git/refs/heads/master HTTP/1.1 404 -
+GET  /smart/repo.git/refs/heads/main HTTP/1.1 404 -
 
 ###  getanyfile default
 ###
diff --git a/t/t5562-http-backend-content-length.sh b/t/t5562-http-backend-content-length.sh
index e5d3d15..7ee9858 100755
--- a/t/t5562-http-backend-content-length.sh
+++ b/t/t5562-http-backend-content-length.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='test git-http-backend respects CONTENT_LENGTH'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_lazy_prereq GZIP 'gzip --version'
@@ -63,7 +65,7 @@ test_expect_success 'setup' '
 	hash_next=$(git commit-tree -p HEAD -m next HEAD^{tree}) &&
 	{
 		printf "%s %s refs/heads/newbranch\\0report-status object-format=%s\\n" \
-			"$ZERO_OID" "$hash_next" "$(test_oid algo)" | packetize &&
+			"$ZERO_OID" "$hash_next" "$(test_oid algo)" | packetize_raw &&
 		printf 0000 &&
 		echo "$hash_next" | git pack-objects --stdout
 	} >push_body &&
diff --git a/t/t5562/invoke-with-content-length.pl b/t/t5562/invoke-with-content-length.pl
index 0943474..9babb9a 100644
--- a/t/t5562/invoke-with-content-length.pl
+++ b/t/t5562/invoke-with-content-length.pl
@@ -1,4 +1,4 @@
-use 5.008;
+use 5.008001;
 use strict;
 use warnings;
 
@@ -13,11 +13,6 @@ my $body_data;
 defined read($body_fh, $body_data, $body_size) or die "Cannot read $body_filename: $!";
 close($body_fh);
 
-my $exited = 0;
-$SIG{"CHLD"} = sub {
-        $exited = 1;
-};
-
 # write data
 my $pid = open(my $out, "|-", @command);
 {
@@ -29,8 +24,13 @@ my $pid = open(my $out, "|-", @command);
 }
 print $out $body_data or die "Cannot write data: $!";
 
-sleep 60; # is interrupted by SIGCHLD
-if (!$exited) {
-        close($out);
+$SIG{ALRM} = sub {
+        kill 'KILL', $pid;
         die "Command did not exit after reading whole body";
+};
+alarm 60;
+
+my $ret = waitpid($pid, 0);
+if ($ret != $pid) {
+        die "confusing return from waitpid: $ret";
 }
diff --git a/t/t5563-simple-http-auth.sh b/t/t5563-simple-http-auth.sh
new file mode 100755
index 0000000..ab8a721
--- /dev/null
+++ b/t/t5563-simple-http-auth.sh
@@ -0,0 +1,329 @@
+#!/bin/sh
+
+test_description='test http auth header and credential helper interop'
+
+. ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-httpd.sh
+
+enable_cgipassauth
+if ! test_have_prereq CGIPASSAUTH
+then
+	skip_all="no CGIPassAuth support"
+	test_done
+fi
+start_httpd
+
+test_expect_success 'setup_credential_helper' '
+	mkdir "$TRASH_DIRECTORY/bin" &&
+	PATH=$PATH:"$TRASH_DIRECTORY/bin" &&
+	export PATH &&
+
+	CREDENTIAL_HELPER="$TRASH_DIRECTORY/bin/git-credential-test-helper" &&
+	write_script "$CREDENTIAL_HELPER" <<-\EOF
+	cmd=$1
+	teefile=$cmd-query.cred
+	catfile=$cmd-reply.cred
+	sed -n -e "/^$/q" -e "p" >>$teefile
+	if test "$cmd" = "get"
+	then
+		cat $catfile
+	fi
+	EOF
+'
+
+set_credential_reply () {
+	cat >"$TRASH_DIRECTORY/$1-reply.cred"
+}
+
+expect_credential_query () {
+	cat >"$TRASH_DIRECTORY/$1-expect.cred" &&
+	test_cmp "$TRASH_DIRECTORY/$1-expect.cred" \
+		 "$TRASH_DIRECTORY/$1-query.cred"
+}
+
+per_test_cleanup () {
+	rm -f *.cred &&
+	rm -f "$HTTPD_ROOT_PATH"/custom-auth.valid \
+	      "$HTTPD_ROOT_PATH"/custom-auth.challenge
+}
+
+test_expect_success 'setup repository' '
+	test_commit foo &&
+	git init --bare "$HTTPD_DOCUMENT_ROOT_PATH/repo.git" &&
+	git push --mirror "$HTTPD_DOCUMENT_ROOT_PATH/repo.git"
+'
+
+test_expect_success 'access using basic auth' '
+	test_when_finished "per_test_cleanup" &&
+
+	set_credential_reply get <<-EOF &&
+	username=alice
+	password=secret-passwd
+	EOF
+
+	# Basic base64(alice:secret-passwd)
+	cat >"$HTTPD_ROOT_PATH/custom-auth.valid" <<-EOF &&
+	Basic YWxpY2U6c2VjcmV0LXBhc3N3ZA==
+	EOF
+
+	cat >"$HTTPD_ROOT_PATH/custom-auth.challenge" <<-EOF &&
+	WWW-Authenticate: Basic realm="example.com"
+	EOF
+
+	test_config_global credential.helper test-helper &&
+	git ls-remote "$HTTPD_URL/custom_auth/repo.git" &&
+
+	expect_credential_query get <<-EOF &&
+	protocol=http
+	host=$HTTPD_DEST
+	wwwauth[]=Basic realm="example.com"
+	EOF
+
+	expect_credential_query store <<-EOF
+	protocol=http
+	host=$HTTPD_DEST
+	username=alice
+	password=secret-passwd
+	EOF
+'
+
+test_expect_success 'access using basic auth invalid credentials' '
+	test_when_finished "per_test_cleanup" &&
+
+	set_credential_reply get <<-EOF &&
+	username=baduser
+	password=wrong-passwd
+	EOF
+
+	# Basic base64(alice:secret-passwd)
+	cat >"$HTTPD_ROOT_PATH/custom-auth.valid" <<-EOF &&
+	Basic YWxpY2U6c2VjcmV0LXBhc3N3ZA==
+	EOF
+
+	cat >"$HTTPD_ROOT_PATH/custom-auth.challenge" <<-EOF &&
+	WWW-Authenticate: Basic realm="example.com"
+	EOF
+
+	test_config_global credential.helper test-helper &&
+	test_must_fail git ls-remote "$HTTPD_URL/custom_auth/repo.git" &&
+
+	expect_credential_query get <<-EOF &&
+	protocol=http
+	host=$HTTPD_DEST
+	wwwauth[]=Basic realm="example.com"
+	EOF
+
+	expect_credential_query erase <<-EOF
+	protocol=http
+	host=$HTTPD_DEST
+	username=baduser
+	password=wrong-passwd
+	wwwauth[]=Basic realm="example.com"
+	EOF
+'
+
+test_expect_success 'access using basic auth with extra challenges' '
+	test_when_finished "per_test_cleanup" &&
+
+	set_credential_reply get <<-EOF &&
+	username=alice
+	password=secret-passwd
+	EOF
+
+	# Basic base64(alice:secret-passwd)
+	cat >"$HTTPD_ROOT_PATH/custom-auth.valid" <<-EOF &&
+	Basic YWxpY2U6c2VjcmV0LXBhc3N3ZA==
+	EOF
+
+	cat >"$HTTPD_ROOT_PATH/custom-auth.challenge" <<-EOF &&
+	WWW-Authenticate: FooBar param1="value1" param2="value2"
+	WWW-Authenticate: Bearer authorize_uri="id.example.com" p=1 q=0
+	WWW-Authenticate: Basic realm="example.com"
+	EOF
+
+	test_config_global credential.helper test-helper &&
+	git ls-remote "$HTTPD_URL/custom_auth/repo.git" &&
+
+	expect_credential_query get <<-EOF &&
+	protocol=http
+	host=$HTTPD_DEST
+	wwwauth[]=FooBar param1="value1" param2="value2"
+	wwwauth[]=Bearer authorize_uri="id.example.com" p=1 q=0
+	wwwauth[]=Basic realm="example.com"
+	EOF
+
+	expect_credential_query store <<-EOF
+	protocol=http
+	host=$HTTPD_DEST
+	username=alice
+	password=secret-passwd
+	EOF
+'
+
+test_expect_success 'access using basic auth mixed-case wwwauth header name' '
+	test_when_finished "per_test_cleanup" &&
+
+	set_credential_reply get <<-EOF &&
+	username=alice
+	password=secret-passwd
+	EOF
+
+	# Basic base64(alice:secret-passwd)
+	cat >"$HTTPD_ROOT_PATH/custom-auth.valid" <<-EOF &&
+	Basic YWxpY2U6c2VjcmV0LXBhc3N3ZA==
+	EOF
+
+	cat >"$HTTPD_ROOT_PATH/custom-auth.challenge" <<-EOF &&
+	www-authenticate: foobar param1="value1" param2="value2"
+	WWW-AUTHENTICATE: BEARER authorize_uri="id.example.com" p=1 q=0
+	WwW-aUtHeNtIcAtE: baSiC realm="example.com"
+	EOF
+
+	test_config_global credential.helper test-helper &&
+	git ls-remote "$HTTPD_URL/custom_auth/repo.git" &&
+
+	expect_credential_query get <<-EOF &&
+	protocol=http
+	host=$HTTPD_DEST
+	wwwauth[]=foobar param1="value1" param2="value2"
+	wwwauth[]=BEARER authorize_uri="id.example.com" p=1 q=0
+	wwwauth[]=baSiC realm="example.com"
+	EOF
+
+	expect_credential_query store <<-EOF
+	protocol=http
+	host=$HTTPD_DEST
+	username=alice
+	password=secret-passwd
+	EOF
+'
+
+test_expect_success 'access using basic auth with wwwauth header continuations' '
+	test_when_finished "per_test_cleanup" &&
+
+	set_credential_reply get <<-EOF &&
+	username=alice
+	password=secret-passwd
+	EOF
+
+	# Basic base64(alice:secret-passwd)
+	cat >"$HTTPD_ROOT_PATH/custom-auth.valid" <<-EOF &&
+	Basic YWxpY2U6c2VjcmV0LXBhc3N3ZA==
+	EOF
+
+	# Note that leading and trailing whitespace is important to correctly
+	# simulate a continuation/folded header.
+	cat >"$HTTPD_ROOT_PATH/custom-auth.challenge" <<-EOF &&
+	WWW-Authenticate: FooBar param1="value1"
+	 param2="value2"
+	WWW-Authenticate: Bearer authorize_uri="id.example.com"
+	 p=1
+	 q=0
+	WWW-Authenticate: Basic realm="example.com"
+	EOF
+
+	test_config_global credential.helper test-helper &&
+	git ls-remote "$HTTPD_URL/custom_auth/repo.git" &&
+
+	expect_credential_query get <<-EOF &&
+	protocol=http
+	host=$HTTPD_DEST
+	wwwauth[]=FooBar param1="value1" param2="value2"
+	wwwauth[]=Bearer authorize_uri="id.example.com" p=1 q=0
+	wwwauth[]=Basic realm="example.com"
+	EOF
+
+	expect_credential_query store <<-EOF
+	protocol=http
+	host=$HTTPD_DEST
+	username=alice
+	password=secret-passwd
+	EOF
+'
+
+test_expect_success 'access using basic auth with wwwauth header empty continuations' '
+	test_when_finished "per_test_cleanup" &&
+
+	set_credential_reply get <<-EOF &&
+	username=alice
+	password=secret-passwd
+	EOF
+
+	# Basic base64(alice:secret-passwd)
+	cat >"$HTTPD_ROOT_PATH/custom-auth.valid" <<-EOF &&
+	Basic YWxpY2U6c2VjcmV0LXBhc3N3ZA==
+	EOF
+
+	CHALLENGE="$HTTPD_ROOT_PATH/custom-auth.challenge" &&
+
+	# Note that leading and trailing whitespace is important to correctly
+	# simulate a continuation/folded header.
+	printf "WWW-Authenticate: FooBar param1=\"value1\"\r\n" >"$CHALLENGE" &&
+	printf " \r\n" >>"$CHALLENGE" &&
+	printf " param2=\"value2\"\r\n" >>"$CHALLENGE" &&
+	printf "WWW-Authenticate: Bearer authorize_uri=\"id.example.com\"\r\n" >>"$CHALLENGE" &&
+	printf " p=1\r\n" >>"$CHALLENGE" &&
+	printf " \r\n" >>"$CHALLENGE" &&
+	printf " q=0\r\n" >>"$CHALLENGE" &&
+	printf "WWW-Authenticate: Basic realm=\"example.com\"\r\n" >>"$CHALLENGE" &&
+
+	test_config_global credential.helper test-helper &&
+	git ls-remote "$HTTPD_URL/custom_auth/repo.git" &&
+
+	expect_credential_query get <<-EOF &&
+	protocol=http
+	host=$HTTPD_DEST
+	wwwauth[]=FooBar param1="value1" param2="value2"
+	wwwauth[]=Bearer authorize_uri="id.example.com" p=1 q=0
+	wwwauth[]=Basic realm="example.com"
+	EOF
+
+	expect_credential_query store <<-EOF
+	protocol=http
+	host=$HTTPD_DEST
+	username=alice
+	password=secret-passwd
+	EOF
+'
+
+test_expect_success 'access using basic auth with wwwauth header mixed line-endings' '
+	test_when_finished "per_test_cleanup" &&
+
+	set_credential_reply get <<-EOF &&
+	username=alice
+	password=secret-passwd
+	EOF
+
+	# Basic base64(alice:secret-passwd)
+	cat >"$HTTPD_ROOT_PATH/custom-auth.valid" <<-EOF &&
+	Basic YWxpY2U6c2VjcmV0LXBhc3N3ZA==
+	EOF
+
+	CHALLENGE="$HTTPD_ROOT_PATH/custom-auth.challenge" &&
+
+	# Note that leading and trailing whitespace is important to correctly
+	# simulate a continuation/folded header.
+	printf "WWW-Authenticate: FooBar param1=\"value1\"\r\n" >"$CHALLENGE" &&
+	printf " \r\n" >>"$CHALLENGE" &&
+	printf "\tparam2=\"value2\"\r\n" >>"$CHALLENGE" &&
+	printf "WWW-Authenticate: Basic realm=\"example.com\"" >>"$CHALLENGE" &&
+
+	test_config_global credential.helper test-helper &&
+	git ls-remote "$HTTPD_URL/custom_auth/repo.git" &&
+
+	expect_credential_query get <<-EOF &&
+	protocol=http
+	host=$HTTPD_DEST
+	wwwauth[]=FooBar param1="value1" param2="value2"
+	wwwauth[]=Basic realm="example.com"
+	EOF
+
+	expect_credential_query store <<-EOF
+	protocol=http
+	host=$HTTPD_DEST
+	username=alice
+	password=secret-passwd
+	EOF
+'
+
+test_done
diff --git a/t/t5564-http-proxy.sh b/t/t5564-http-proxy.sh
new file mode 100755
index 0000000..9da5134
--- /dev/null
+++ b/t/t5564-http-proxy.sh
@@ -0,0 +1,41 @@
+#!/bin/sh
+
+test_description="test fetching through http proxy"
+
+. ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-httpd.sh
+
+LIB_HTTPD_PROXY=1
+start_httpd
+
+test_expect_success 'setup repository' '
+	test_commit foo &&
+	git init --bare "$HTTPD_DOCUMENT_ROOT_PATH/repo.git" &&
+	git push --mirror "$HTTPD_DOCUMENT_ROOT_PATH/repo.git"
+'
+
+setup_askpass_helper
+
+# sanity check that our test setup is correctly using proxy
+test_expect_success 'proxy requires password' '
+	test_config_global http.proxy $HTTPD_DEST &&
+	test_must_fail git clone $HTTPD_URL/smart/repo.git 2>err &&
+	grep "error.*407" err
+'
+
+test_expect_success 'clone through proxy with auth' '
+	test_when_finished "rm -rf clone" &&
+	test_config_global http.proxy http://proxuser:proxpass@$HTTPD_DEST &&
+	GIT_TRACE_CURL=$PWD/trace git clone $HTTPD_URL/smart/repo.git clone &&
+	grep -i "Proxy-Authorization: Basic <redacted>" trace
+'
+
+test_expect_success 'clone can prompt for proxy password' '
+	test_when_finished "rm -rf clone" &&
+	test_config_global http.proxy http://proxuser@$HTTPD_DEST &&
+	set_askpass nobody proxpass &&
+	GIT_TRACE_CURL=$PWD/trace git clone $HTTPD_URL/smart/repo.git clone &&
+	expect_askpass pass proxuser
+'
+
+test_done
diff --git a/t/t556x_common b/t/t556x_common
index 359fcfe..670fb89 100755
--- a/t/t556x_common
+++ b/t/t556x_common
@@ -22,7 +22,7 @@ test_expect_success 'setup repository' '
 	 : >objects/info/http-alternates
 	) &&
 	git remote add public "$HTTPD_DOCUMENT_ROOT_PATH/repo.git" &&
-	git push public master:master &&
+	git push public main:main &&
 
 	(cd "$HTTPD_DOCUMENT_ROOT_PATH/repo.git" &&
 	 git repack -a -d
@@ -31,7 +31,7 @@ test_expect_success 'setup repository' '
 	echo other >file &&
 	git add file &&
 	git commit -m two &&
-	git push public master:master &&
+	git push public main:main &&
 
 	LOOSE_URL=$(find_file objects/??) &&
 	PACK_URL=$(find_file objects/pack/*.pack) &&
@@ -51,8 +51,8 @@ get_static_files() {
 
 SMART=smart
 GIT_HTTP_EXPORT_ALL=1 && export GIT_HTTP_EXPORT_ALL
-test_expect_success 'direct refs/heads/master not found' '
-	GET refs/heads/master "404 Not Found"
+test_expect_success 'direct refs/heads/main not found' '
+	GET refs/heads/main "404 Not Found"
 '
 test_expect_success 'static file is ok' '
 	get_static_files "200 OK"
diff --git a/t/t5570-git-daemon.sh b/t/t5570-git-daemon.sh
index 34487bb..f9a9bf9 100755
--- a/t/t5570-git-daemon.sh
+++ b/t/t5570-git-daemon.sh
@@ -1,15 +1,18 @@
 #!/bin/sh
 
 test_description='test fetching over git protocol'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 . "$TEST_DIRECTORY"/lib-git-daemon.sh
 start_git_daemon
 
 check_verbose_connect () {
-	test_i18ngrep -F "Looking up 127.0.0.1 ..." stderr &&
-	test_i18ngrep -F "Connecting to 127.0.0.1 (port " stderr &&
-	test_i18ngrep -F "done." stderr
+	test_grep -F "Looking up 127.0.0.1 ..." stderr &&
+	test_grep -F "Connecting to 127.0.0.1 (port " stderr &&
+	test_grep -F "done." stderr
 }
 
 test_expect_success 'setup repository' '
@@ -26,7 +29,7 @@ test_expect_success 'create git-accessible bare repository' '
 	 : >git-daemon-export-ok
 	) &&
 	git remote add public "$GIT_DAEMON_DOCUMENT_ROOT_PATH/repo.git" &&
-	git push public master:master
+	git push public main:main
 '
 
 test_expect_success 'clone git repository' '
@@ -55,12 +58,12 @@ test_expect_success 'no-op fetch without "-v" is quiet' '
 '
 
 test_expect_success 'remote detects correct HEAD' '
-	git push public master:other &&
+	git push public main:other &&
 	(cd clone &&
 	 git remote set-head -d origin &&
 	 git remote set-head -a origin &&
 	 git symbolic-ref refs/remotes/origin/HEAD > output &&
-	 echo refs/remotes/origin/master > expect &&
+	 echo refs/remotes/origin/main > expect &&
 	 test_cmp expect output
 	)
 '
@@ -103,6 +106,11 @@ test_expect_success 'fetch notices corrupt idx' '
 	)
 '
 
+test_expect_success 'client refuses to ask for repo with newline' '
+	test_must_fail git clone "$GIT_DAEMON_URL/repo$LF.git" dst 2>stderr &&
+	test_grep newline.is.forbidden stderr
+'
+
 test_remote_error()
 {
 	do_export=YesPlease
@@ -140,25 +148,25 @@ test_remote_error()
 	fi
 
 	test_must_fail git "$cmd" "$GIT_DAEMON_URL/$repo" "$@" 2>output &&
-	test_i18ngrep "fatal: remote error: $msg: /$repo" output &&
+	test_grep "fatal: remote error: $msg: /$repo" output &&
 	ret=$?
 	chmod +x "$GIT_DAEMON_DOCUMENT_ROOT_PATH/repo.git"
 	(exit $ret)
 }
 
 msg="access denied or repository not exported"
-test_expect_success 'clone non-existent' "test_remote_error    '$msg' clone nowhere.git    "
-test_expect_success 'push disabled'      "test_remote_error    '$msg' push  repo.git master"
-test_expect_success 'read access denied' "test_remote_error -x '$msg' fetch repo.git       "
-test_expect_success 'not exported'       "test_remote_error -n '$msg' fetch repo.git       "
+test_expect_success 'clone non-existent' "test_remote_error    '$msg' clone nowhere.git"
+test_expect_success 'push disabled'      "test_remote_error    '$msg' push  repo.git main"
+test_expect_success 'read access denied' "test_remote_error -x '$msg' fetch repo.git"
+test_expect_success 'not exported'       "test_remote_error -n '$msg' fetch repo.git"
 
 stop_git_daemon
 start_git_daemon --informative-errors
 
-test_expect_success 'clone non-existent' "test_remote_error    'no such repository'      clone nowhere.git    "
-test_expect_success 'push disabled'      "test_remote_error    'service not enabled'     push  repo.git master"
-test_expect_success 'read access denied' "test_remote_error -x 'no such repository'      fetch repo.git       "
-test_expect_success 'not exported'       "test_remote_error -n 'repository not exported' fetch repo.git       "
+test_expect_success 'clone non-existent' "test_remote_error    'no such repository'      clone nowhere.git"
+test_expect_success 'push disabled'      "test_remote_error    'service not enabled'     push  repo.git main"
+test_expect_success 'read access denied' "test_remote_error -x 'no such repository'      fetch repo.git"
+test_expect_success 'not exported'       "test_remote_error -n 'repository not exported' fetch repo.git"
 
 stop_git_daemon
 start_git_daemon --interpolated-path="$GIT_DAEMON_DOCUMENT_ROOT_PATH/%H%D"
@@ -186,16 +194,16 @@ test_expect_success 'hostname cannot break out of directory' '
 
 test_expect_success FAKENC 'hostname interpolation works after LF-stripping' '
 	{
-		printf "git-upload-pack /interp.git\n\0host=localhost" | packetize
+		printf "git-upload-pack /interp.git\n\0host=localhost" | packetize_raw &&
 		printf "0000"
 	} >input &&
 	fake_nc "$GIT_DAEMON_HOST_PORT" <input >output &&
 	depacketize <output >output.raw &&
 
-	# just pick out the value of master, which avoids any protocol
+	# just pick out the value of main, which avoids any protocol
 	# particulars
-	perl -lne "print \$1 if m{^(\\S+) refs/heads/master}" <output.raw >actual &&
-	git -C "$repo" rev-parse master >expect &&
+	perl -lne "print \$1 if m{^(\\S+) refs/heads/main}" <output.raw >actual &&
+	git -C "$repo" rev-parse main >expect &&
 	test_cmp expect actual
 '
 
diff --git a/t/t5571-pre-push-hook.sh b/t/t5571-pre-push-hook.sh
index ac53d63..448134c 100755
--- a/t/t5571-pre-push-hook.sh
+++ b/t/t5571-pre-push-hook.sh
@@ -1,59 +1,72 @@
 #!/bin/sh
 
 test_description='check pre-push hooks'
-. ./test-lib.sh
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
-# Setup hook that always succeeds
-HOOKDIR="$(git rev-parse --git-dir)/hooks"
-HOOK="$HOOKDIR/pre-push"
-mkdir -p "$HOOKDIR"
-write_script "$HOOK" <<EOF
-cat >/dev/null
-exit 0
-EOF
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
 
 test_expect_success 'setup' '
+	test_hook pre-push <<-\EOF &&
+	cat >actual
+	EOF
+
 	git config push.default upstream &&
 	git init --bare repo1 &&
 	git remote add parent1 repo1 &&
 	test_commit one &&
-	git push parent1 HEAD:foreign
+	cat >expect <<-EOF &&
+	HEAD $(git rev-parse HEAD) refs/heads/foreign $(test_oid zero)
+	EOF
+
+	test_when_finished "rm actual" &&
+	git push parent1 HEAD:foreign &&
+	test_cmp expect actual
 '
-write_script "$HOOK" <<EOF
-cat >/dev/null
-exit 1
-EOF
 
 COMMIT1="$(git rev-parse HEAD)"
 export COMMIT1
 
 test_expect_success 'push with failing hook' '
+	test_hook pre-push <<-\EOF &&
+	cat >actual &&
+	exit 1
+	EOF
+
 	test_commit two &&
-	test_must_fail git push parent1 HEAD
+	cat >expect <<-EOF &&
+	HEAD $(git rev-parse HEAD) refs/heads/main $(test_oid zero)
+	EOF
+
+	test_when_finished "rm actual" &&
+	test_must_fail git push parent1 HEAD &&
+	test_cmp expect actual
 '
 
 test_expect_success '--no-verify bypasses hook' '
-	git push --no-verify parent1 HEAD
+	git push --no-verify parent1 HEAD &&
+	test_path_is_missing actual
 '
 
 COMMIT2="$(git rev-parse HEAD)"
 export COMMIT2
 
-write_script "$HOOK" <<'EOF'
-echo "$1" >actual
-echo "$2" >>actual
-cat >>actual
-EOF
-
-cat >expected <<EOF
-parent1
-repo1
-refs/heads/master $COMMIT2 refs/heads/foreign $COMMIT1
-EOF
-
 test_expect_success 'push with hook' '
-	git push parent1 master:foreign &&
-	diff expected actual
+	test_hook --setup pre-push <<-\EOF &&
+	echo "$1" >actual
+	echo "$2" >>actual
+	cat >>actual
+	EOF
+
+	cat >expect <<-EOF &&
+	parent1
+	repo1
+	refs/heads/main $COMMIT2 refs/heads/foreign $COMMIT1
+	EOF
+
+	git push parent1 main:foreign &&
+	test_cmp expect actual
 '
 
 test_expect_success 'add a branch' '
@@ -64,64 +77,65 @@ test_expect_success 'add a branch' '
 COMMIT3="$(git rev-parse HEAD)"
 export COMMIT3
 
-cat >expected <<EOF
-parent1
-repo1
-refs/heads/other $COMMIT3 refs/heads/foreign $COMMIT2
-EOF
-
 test_expect_success 'push to default' '
+	cat >expect <<-EOF &&
+	parent1
+	repo1
+	refs/heads/other $COMMIT3 refs/heads/foreign $COMMIT2
+	EOF
 	git push &&
-	diff expected actual
+	test_cmp expect actual
 '
 
-cat >expected <<EOF
-parent1
-repo1
-refs/tags/one $COMMIT1 refs/tags/tag1 $ZERO_OID
-HEAD~ $COMMIT2 refs/heads/prev $ZERO_OID
-EOF
-
 test_expect_success 'push non-branches' '
+	cat >expect <<-EOF &&
+	parent1
+	repo1
+	refs/tags/one $COMMIT1 refs/tags/tag1 $ZERO_OID
+	HEAD~ $COMMIT2 refs/heads/prev $ZERO_OID
+	EOF
+
 	git push parent1 one:tag1 HEAD~:refs/heads/prev &&
-	diff expected actual
+	test_cmp expect actual
 '
 
-cat >expected <<EOF
-parent1
-repo1
-(delete) $ZERO_OID refs/heads/prev $COMMIT2
-EOF
-
 test_expect_success 'push delete' '
+	cat >expect <<-EOF &&
+	parent1
+	repo1
+	(delete) $ZERO_OID refs/heads/prev $COMMIT2
+	EOF
+
 	git push parent1 :prev &&
-	diff expected actual
+	test_cmp expect actual
 '
 
-cat >expected <<EOF
-repo1
-repo1
-HEAD $COMMIT3 refs/heads/other $ZERO_OID
-EOF
-
 test_expect_success 'push to URL' '
+	cat >expect <<-EOF &&
+	repo1
+	repo1
+	HEAD $COMMIT3 refs/heads/other $ZERO_OID
+	EOF
+
 	git push repo1 HEAD &&
-	diff expected actual
+	test_cmp expect actual
 '
 
 test_expect_success 'set up many-ref tests' '
 	{
-		nr=1000
+		nr=1000 &&
 		while test $nr -lt 2000
 		do
-			nr=$(( $nr + 1 ))
-			echo "create refs/heads/b/$nr $COMMIT3"
+			nr=$(( $nr + 1 )) &&
+			echo "create refs/heads/b/$nr $COMMIT3" || return 1
 		done
 	} | git update-ref --stdin
 '
 
 test_expect_success 'sigpipe does not cause pre-push hook failure' '
-	echo "exit 0" | write_script "$HOOK" &&
+	test_hook --clobber pre-push <<-\EOF &&
+	exit 0
+	EOF
 	git push parent1 "refs/heads/b/*:refs/heads/b/*"
 '
 
diff --git a/t/t5572-pull-submodule.sh b/t/t5572-pull-submodule.sh
index 1d75e3b..5174452 100755
--- a/t/t5572-pull-submodule.sh
+++ b/t/t5572-pull-submodule.sh
@@ -2,6 +2,9 @@
 
 test_description='pull can handle submodules'
 
+GIT_TEST_FATAL_REGISTER_SUBMODULE_ODB=1
+export GIT_TEST_FATAL_REGISTER_SUBMODULE_ODB
+
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-submodule-update.sh
 
@@ -42,10 +45,17 @@ git_pull_noff () {
 	$2 git pull --no-ff
 }
 
-KNOWN_FAILURE_NOFF_MERGE_DOESNT_CREATE_EMPTY_SUBMODULE_DIR=1
-KNOWN_FAILURE_NOFF_MERGE_ATTEMPTS_TO_MERGE_REMOVED_SUBMODULE_FILES=1
+if test "$GIT_TEST_MERGE_ALGORITHM" != ort
+then
+	KNOWN_FAILURE_NOFF_MERGE_DOESNT_CREATE_EMPTY_SUBMODULE_DIR=1
+	KNOWN_FAILURE_NOFF_MERGE_ATTEMPTS_TO_MERGE_REMOVED_SUBMODULE_FILES=1
+fi
 test_submodule_switch_func "git_pull_noff"
 
+test_expect_success 'setup' '
+	git config --global protocol.file.allow always
+'
+
 test_expect_success 'pull --recurse-submodule setup' '
 	test_create_repo child &&
 	test_commit -C child bar &&
@@ -101,7 +111,38 @@ test_expect_success " --[no-]recurse-submodule and submodule.recurse" '
 	test_path_is_file super/sub/merge_strategy_4.t
 '
 
-test_expect_success 'recursive rebasing pull' '
+test_expect_success "fetch.recurseSubmodules option triggers recursive fetch (but not recursive update)" '
+	test_commit -C child merge_strategy_5 &&
+	# Omit the parent commit, otherwise this passes with the
+	# default "pull" behavior.
+
+	git -C super -c fetch.recursesubmodules=true pull --no-rebase &&
+	# Check that the submodule commit was fetched
+	sub_oid=$(git -C child rev-parse HEAD) &&
+	git -C super/sub cat-file -e $sub_oid &&
+	# Check that the submodule worktree did not update
+	test_path_is_missing super/sub/merge_strategy_5.t
+'
+
+test_expect_success "fetch.recurseSubmodules takes precedence over submodule.recurse" '
+	test_commit -C child merge_strategy_6 &&
+	# Omit the parent commit, otherwise this passes with the
+	# default "pull" behavior.
+
+	git -C super -c submodule.recurse=false -c fetch.recursesubmodules=true pull --no-rebase &&
+	# Check that the submodule commit was fetched
+	sub_oid=$(git -C child rev-parse HEAD) &&
+	git -C super/sub cat-file -e $sub_oid &&
+	# Check that the submodule worktree did not update
+	test_path_is_missing super/sub/merge_strategy_6.t
+'
+
+test_expect_success 'pull --rebase --recurse-submodules (remote superproject submodule changes, local submodule changes)' '
+	# This tests the following scenario :
+	# - local submodule has new commits
+	# - local superproject does not have new commits
+	# - upstream superproject has new commits that change the submodule pointer
+
 	# change upstream
 	test_commit -C child rebase_strategy &&
 	git -C parent submodule update --remote &&
@@ -116,7 +157,10 @@ test_expect_success 'recursive rebasing pull' '
 	test_path_is_file super/sub/local_stuff.t
 '
 
-test_expect_success 'pull rebase recursing fails with conflicts' '
+test_expect_success 'pull --rebase --recurse-submodules fails if both sides record submodule changes' '
+	# This tests the following scenario :
+	# - local superproject has new commits that change the submodule pointer
+	# - upstream superproject has new commits that change the submodule pointer
 
 	# local changes in submodule recorded in superproject:
 	test_commit -C super/sub local_stuff_2 &&
@@ -133,9 +177,53 @@ test_expect_success 'pull rebase recursing fails with conflicts' '
 	# submodule itself, but the merge strategy in submodules
 	# does not support rebase:
 	test_must_fail git -C super pull --rebase --recurse-submodules 2>err &&
-	test_i18ngrep "locally recorded submodule modifications" err
+	test_grep "locally recorded submodule modifications" err
+'
+
+test_expect_success 'pull --rebase --recurse-submodules (no submodule changes, no fork-point)' '
+	# This tests the following scenario :
+	# - local submodule does not have new commits
+	# - local superproject has new commits that *do not* change the submodule pointer
+	# - upstream superproject has new commits that *do not* change the submodule pointer
+	# - local superproject branch has no fork-point with its remote-tracking counter-part
+
+	# create upstream superproject
+	test_create_repo submodule &&
+	test_commit -C submodule first_in_sub &&
+
+	test_create_repo superprojet &&
+	test_commit -C superprojet first_in_super &&
+	git -C superprojet submodule add ../submodule &&
+	git -C superprojet commit -m "add submodule" &&
+	test_commit -C superprojet third_in_super &&
+
+	# clone superproject
+	git clone --recurse-submodules superprojet superclone &&
+
+	# add commits upstream
+	test_commit -C superprojet fourth_in_super &&
+
+	# create topic branch in clone, not based on any remote-tracking branch
+	git -C superclone checkout -b feat HEAD~1 &&
+	test_commit -C superclone first_on_feat &&
+	git -C superclone pull --rebase --recurse-submodules origin HEAD
 '
 
+# NOTE:
+#
+# This test is particular because there is only a single commit in the upstream superproject
+# 'parent' (which adds the submodule 'a-submodule'). The clone of the superproject
+# ('child') hard-resets its branch to a new root commit with the same tree as the one
+# from the upstream superproject, so that its branch has no merge-base with its
+# remote-tracking counterpart, and then calls 'git pull --recurse-submodules --rebase'.
+# The result is that the local branch is reset to the remote-tracking branch (as it was
+# originally before the hard-reset).
+
+# The only commit in the range generated by 'submodule.c::submodule_touches_in_range' and
+# passed to 'submodule.c::collect_changed_submodules' is the new (regenerated) initial commit,
+# which adds the submodule.
+# However, 'submodule_touches_in_range' does not error (even though this commit adds the submodule)
+# because 'combine-diff.c::diff_tree_combined' returns early, as the initial commit has no parents.
 test_expect_success 'branch has no merge base with remote-tracking counterpart' '
 	rm -rf parent child &&
 
@@ -148,8 +236,8 @@ test_expect_success 'branch has no merge base with remote-tracking counterpart'
 
 	git clone parent child &&
 
-	# Reset master so that it has no merge base with
-	# refs/remotes/origin/master.
+	# Reset the current branch so that it has no merge base with
+	# the remote-tracking branch.
 	OTHER=$(git -C child commit-tree -m bar \
 		$(git -C child rev-parse HEAD^{tree})) &&
 	git -C child reset --hard "$OTHER" &&
diff --git a/t/t5573-pull-verify-signatures.sh b/t/t5573-pull-verify-signatures.sh
index a53dd85..ab05f38 100755
--- a/t/t5573-pull-verify-signatures.sh
+++ b/t/t5573-pull-verify-signatures.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='pull signature verification tests'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY/lib-gpg.sh"
 
@@ -45,46 +47,46 @@ test_expect_success GPG 'create repositories with signed commits' '
 test_expect_success GPG 'pull unsigned commit with --verify-signatures' '
 	test_when_finished "git reset --hard && git checkout initial" &&
 	test_must_fail git pull --ff-only --verify-signatures unsigned 2>pullerror &&
-	test_i18ngrep "does not have a GPG signature" pullerror
+	test_grep "does not have a GPG signature" pullerror
 '
 
 test_expect_success GPG 'pull commit with bad signature with --verify-signatures' '
 	test_when_finished "git reset --hard && git checkout initial" &&
 	test_must_fail git pull --ff-only --verify-signatures bad 2>pullerror &&
-	test_i18ngrep "has a bad GPG signature" pullerror
+	test_grep "has a bad GPG signature" pullerror
 '
 
 test_expect_success GPG 'pull commit with untrusted signature with --verify-signatures' '
 	test_when_finished "git reset --hard && git checkout initial" &&
 	test_must_fail git pull --ff-only --verify-signatures untrusted 2>pullerror &&
-	test_i18ngrep "has an untrusted GPG signature" pullerror
+	test_grep "has an untrusted GPG signature" pullerror
 '
 
 test_expect_success GPG 'pull commit with untrusted signature with --verify-signatures and minTrustLevel=ultimate' '
 	test_when_finished "git reset --hard && git checkout initial" &&
 	test_config gpg.minTrustLevel ultimate &&
 	test_must_fail git pull --ff-only --verify-signatures untrusted 2>pullerror &&
-	test_i18ngrep "has an untrusted GPG signature" pullerror
+	test_grep "has an untrusted GPG signature" pullerror
 '
 
 test_expect_success GPG 'pull commit with untrusted signature with --verify-signatures and minTrustLevel=marginal' '
 	test_when_finished "git reset --hard && git checkout initial" &&
 	test_config gpg.minTrustLevel marginal &&
 	test_must_fail git pull --ff-only --verify-signatures untrusted 2>pullerror &&
-	test_i18ngrep "has an untrusted GPG signature" pullerror
+	test_grep "has an untrusted GPG signature" pullerror
 '
 
 test_expect_success GPG 'pull commit with untrusted signature with --verify-signatures and minTrustLevel=undefined' '
 	test_when_finished "git reset --hard && git checkout initial" &&
 	test_config gpg.minTrustLevel undefined &&
 	git pull --ff-only --verify-signatures untrusted >pulloutput &&
-	test_i18ngrep "has a good GPG signature" pulloutput
+	test_grep "has a good GPG signature" pulloutput
 '
 
 test_expect_success GPG 'pull signed commit with --verify-signatures' '
 	test_when_finished "git reset --hard && git checkout initial" &&
 	git pull --verify-signatures signed >pulloutput &&
-	test_i18ngrep "has a good GPG signature" pulloutput
+	test_grep "has a good GPG signature" pulloutput
 '
 
 test_expect_success GPG 'pull commit with bad signature without verification' '
@@ -104,7 +106,7 @@ test_expect_success GPG 'pull unsigned commit into unborn branch' '
 	git init empty-repo &&
 	test_must_fail \
 		git -C empty-repo pull --verify-signatures ..  2>pullerror &&
-	test_i18ngrep "does not have a GPG signature" pullerror
+	test_grep "does not have a GPG signature" pullerror
 '
 
 test_expect_success GPG 'pull commit into unborn branch with bad signature and --verify-signatures' '
@@ -112,7 +114,7 @@ test_expect_success GPG 'pull commit into unborn branch with bad signature and -
 	git init empty-repo &&
 	test_must_fail \
 		git -C empty-repo pull --ff-only --verify-signatures ../bad 2>pullerror &&
-	test_i18ngrep "has a bad GPG signature" pullerror
+	test_grep "has a bad GPG signature" pullerror
 '
 
 test_expect_success GPG 'pull commit into unborn branch with untrusted signature and --verify-signatures' '
@@ -120,7 +122,7 @@ test_expect_success GPG 'pull commit into unborn branch with untrusted signature
 	git init empty-repo &&
 	test_must_fail \
 		git -C empty-repo pull --ff-only --verify-signatures ../untrusted 2>pullerror &&
-	test_i18ngrep "has an untrusted GPG signature" pullerror
+	test_grep "has an untrusted GPG signature" pullerror
 '
 
 test_expect_success GPG 'pull commit into unborn branch with untrusted signature and --verify-signatures and minTrustLevel=ultimate' '
@@ -129,7 +131,7 @@ test_expect_success GPG 'pull commit into unborn branch with untrusted signature
 	test_config_global gpg.minTrustLevel ultimate &&
 	test_must_fail \
 		git -C empty-repo pull --ff-only --verify-signatures ../untrusted 2>pullerror &&
-	test_i18ngrep "has an untrusted GPG signature" pullerror
+	test_grep "has an untrusted GPG signature" pullerror
 '
 
 test_expect_success GPG 'pull commit into unborn branch with untrusted signature and --verify-signatures and minTrustLevel=marginal' '
@@ -138,7 +140,7 @@ test_expect_success GPG 'pull commit into unborn branch with untrusted signature
 	test_config_global gpg.minTrustLevel marginal &&
 	test_must_fail \
 		git -C empty-repo pull --ff-only --verify-signatures ../untrusted 2>pullerror &&
-	test_i18ngrep "has an untrusted GPG signature" pullerror
+	test_grep "has an untrusted GPG signature" pullerror
 '
 
 test_expect_success GPG 'pull commit into unborn branch with untrusted signature and --verify-signatures and minTrustLevel=undefined' '
@@ -146,7 +148,7 @@ test_expect_success GPG 'pull commit into unborn branch with untrusted signature
 	git init empty-repo &&
 	test_config_global gpg.minTrustLevel undefined &&
 	git -C empty-repo pull --ff-only --verify-signatures ../untrusted >pulloutput &&
-	test_i18ngrep "has a good GPG signature" pulloutput
+	test_grep "has a good GPG signature" pulloutput
 '
 
 test_done
diff --git a/t/t5574-fetch-output.sh b/t/t5574-fetch-output.sh
new file mode 100755
index 0000000..5883839
--- /dev/null
+++ b/t/t5574-fetch-output.sh
@@ -0,0 +1,304 @@
+#!/bin/sh
+
+test_description='git fetch output format'
+
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+. ./test-lib.sh
+
+test_expect_success 'fetch with invalid output format configuration' '
+	test_when_finished "rm -rf clone" &&
+	git clone . clone &&
+
+	test_must_fail git -C clone -c fetch.output fetch origin 2>actual.err &&
+	cat >expect <<-EOF &&
+	error: missing value for ${SQ}fetch.output${SQ}
+	fatal: unable to parse ${SQ}fetch.output${SQ} from command-line config
+	EOF
+	test_cmp expect actual.err &&
+
+	test_must_fail git -C clone -c fetch.output= fetch origin 2>actual.err &&
+	cat >expect <<-EOF &&
+	fatal: invalid value for ${SQ}fetch.output${SQ}: ${SQ}${SQ}
+	EOF
+	test_cmp expect actual.err &&
+
+	test_must_fail git -C clone -c fetch.output=garbage fetch origin 2>actual.err &&
+	cat >expect <<-EOF &&
+	fatal: invalid value for ${SQ}fetch.output${SQ}: ${SQ}garbage${SQ}
+	EOF
+	test_cmp expect actual.err
+'
+
+test_expect_success 'fetch aligned output' '
+	git clone . full-output &&
+	test_commit looooooooooooong-tag &&
+	(
+		cd full-output &&
+		git -c fetch.output=full fetch origin >actual 2>&1 &&
+		grep -e "->" actual | cut -c 22- >../actual
+	) &&
+	cat >expect <<-\EOF &&
+	main                 -> origin/main
+	looooooooooooong-tag -> looooooooooooong-tag
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'fetch compact output' '
+	git clone . compact &&
+	test_commit extraaa &&
+	(
+		cd compact &&
+		git -c fetch.output=compact fetch origin >actual 2>&1 &&
+		grep -e "->" actual | cut -c 22- >../actual
+	) &&
+	cat >expect <<-\EOF &&
+	main       -> origin/*
+	extraaa    -> *
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'setup for fetch porcelain output' '
+	# Set up a bunch of references that we can use to demonstrate different
+	# kinds of flag symbols in the output format.
+	test_commit commit-for-porcelain-output &&
+	MAIN_OLD=$(git rev-parse HEAD) &&
+	git branch "fast-forward" &&
+	git branch "deleted-branch" &&
+	git checkout -b force-updated &&
+	test_commit --no-tag force-update-old &&
+	FORCE_UPDATED_OLD=$(git rev-parse HEAD) &&
+	git checkout main &&
+
+	# Backup to preseed.git
+	git clone --mirror . preseed.git &&
+
+	# Continue changing our local references.
+	git branch new-branch &&
+	git branch -d deleted-branch &&
+	git checkout fast-forward &&
+	test_commit --no-tag fast-forward-new &&
+	FAST_FORWARD_NEW=$(git rev-parse HEAD) &&
+	git checkout force-updated &&
+	git reset --hard HEAD~ &&
+	test_commit --no-tag force-update-new &&
+	FORCE_UPDATED_NEW=$(git rev-parse HEAD)
+'
+
+for opt in "" "--atomic"
+do
+	test_expect_success "fetch porcelain output ${opt:+(atomic)}" '
+		test_when_finished "rm -rf porcelain" &&
+
+		# Clone and pre-seed the repositories. We fetch references into two
+		# namespaces so that we can test that rejected and force-updated
+		# references are reported properly.
+		refspecs="refs/heads/*:refs/unforced/* +refs/heads/*:refs/forced/*" &&
+		git clone preseed.git porcelain &&
+		git -C porcelain fetch origin $opt $refspecs &&
+
+		cat >expect <<-EOF &&
+		- $MAIN_OLD $ZERO_OID refs/forced/deleted-branch
+		- $MAIN_OLD $ZERO_OID refs/unforced/deleted-branch
+		  $MAIN_OLD $FAST_FORWARD_NEW refs/unforced/fast-forward
+		! $FORCE_UPDATED_OLD $FORCE_UPDATED_NEW refs/unforced/force-updated
+		* $ZERO_OID $MAIN_OLD refs/unforced/new-branch
+		  $MAIN_OLD $FAST_FORWARD_NEW refs/forced/fast-forward
+		+ $FORCE_UPDATED_OLD $FORCE_UPDATED_NEW refs/forced/force-updated
+		* $ZERO_OID $MAIN_OLD refs/forced/new-branch
+		  $MAIN_OLD $FAST_FORWARD_NEW refs/remotes/origin/fast-forward
+		+ $FORCE_UPDATED_OLD $FORCE_UPDATED_NEW refs/remotes/origin/force-updated
+		* $ZERO_OID $MAIN_OLD refs/remotes/origin/new-branch
+		EOF
+
+		# Change the URL of the repository to fetch different references.
+		git -C porcelain remote set-url origin .. &&
+
+		# Execute a dry-run fetch first. We do this to assert that the dry-run
+		# and non-dry-run fetches produces the same output. Execution of the
+		# fetch is expected to fail as we have a rejected reference update.
+		test_must_fail git -C porcelain fetch $opt \
+			--porcelain --dry-run --prune origin $refspecs >actual &&
+		test_cmp expect actual &&
+
+		# And now we perform a non-dry-run fetch.
+		test_must_fail git -C porcelain fetch $opt \
+			--porcelain --prune origin $refspecs >actual 2>stderr &&
+		test_cmp expect actual &&
+		test_must_be_empty stderr
+	'
+done
+
+test_expect_success 'fetch porcelain with multiple remotes' '
+	test_when_finished "rm -rf porcelain" &&
+
+	git switch --create multiple-remotes &&
+	git clone . porcelain &&
+	git -C porcelain remote add second-remote "$PWD" &&
+	git -C porcelain fetch second-remote &&
+
+	test_commit --no-tag multi-commit &&
+	old_commit=$(git rev-parse HEAD~) &&
+	new_commit=$(git rev-parse HEAD) &&
+
+	cat >expect <<-EOF &&
+	  $old_commit $new_commit refs/remotes/origin/multiple-remotes
+	  $old_commit $new_commit refs/remotes/second-remote/multiple-remotes
+	EOF
+
+	git -C porcelain fetch --porcelain --all >actual 2>stderr &&
+	test_cmp expect actual &&
+	test_must_be_empty stderr
+'
+
+test_expect_success 'fetch porcelain refuses to work with submodules' '
+	test_when_finished "rm -rf porcelain" &&
+
+	cat >expect <<-EOF &&
+	fatal: options ${SQ}--porcelain${SQ} and ${SQ}--recurse-submodules${SQ} cannot be used together
+	EOF
+
+	git init porcelain &&
+	test_must_fail git -C porcelain fetch --porcelain --recurse-submodules=yes 2>stderr &&
+	test_cmp expect stderr &&
+
+	test_must_fail git -C porcelain fetch --porcelain --recurse-submodules=on-demand 2>stderr &&
+	test_cmp expect stderr
+'
+
+test_expect_success 'fetch porcelain overrides fetch.output config' '
+	test_when_finished "rm -rf porcelain" &&
+
+	git switch --create config-override &&
+	git clone . porcelain &&
+	test_commit new-commit &&
+	old_commit=$(git rev-parse HEAD~) &&
+	new_commit=$(git rev-parse HEAD) &&
+
+	cat >expect <<-EOF &&
+	  $old_commit $new_commit refs/remotes/origin/config-override
+	* $ZERO_OID $new_commit refs/tags/new-commit
+	EOF
+
+	git -C porcelain -c fetch.output=compact fetch --porcelain >stdout 2>stderr &&
+	test_must_be_empty stderr &&
+	test_cmp expect stdout
+'
+
+test_expect_success 'fetch --no-porcelain overrides previous --porcelain' '
+	test_when_finished "rm -rf no-porcelain" &&
+
+	git switch --create no-porcelain &&
+	git clone . no-porcelain &&
+	test_commit --no-tag no-porcelain &&
+	old_commit=$(git rev-parse --short HEAD~) &&
+	new_commit=$(git rev-parse --short HEAD) &&
+
+	cat >expect <<-EOF &&
+	From $(test-tool path-utils real_path .)/.
+	   $old_commit..$new_commit  no-porcelain -> origin/no-porcelain
+	EOF
+
+	git -C no-porcelain fetch --porcelain --no-porcelain >stdout 2>stderr &&
+	test_cmp expect stderr &&
+	test_must_be_empty stdout
+'
+
+test_expect_success 'fetch output with HEAD' '
+	test_when_finished "rm -rf head" &&
+	git clone . head &&
+
+	git -C head fetch --dry-run origin HEAD >actual.out 2>actual.err &&
+	cat >expect <<-EOF &&
+	From $(test-tool path-utils real_path .)/.
+	 * branch            HEAD       -> FETCH_HEAD
+	EOF
+	test_must_be_empty actual.out &&
+	test_cmp expect actual.err &&
+
+	git -C head fetch origin HEAD >actual.out 2>actual.err &&
+	test_must_be_empty actual.out &&
+	test_cmp expect actual.err &&
+
+	git -C head fetch --dry-run origin HEAD:foo >actual.out 2>actual.err &&
+	cat >expect <<-EOF &&
+	From $(test-tool path-utils real_path .)/.
+	 * [new ref]         HEAD       -> foo
+	EOF
+	test_must_be_empty actual.out &&
+	test_cmp expect actual.err &&
+
+	git -C head fetch origin HEAD:foo >actual.out 2>actual.err &&
+	test_must_be_empty actual.out &&
+	test_cmp expect actual.err
+'
+
+test_expect_success 'fetch porcelain output with HEAD' '
+	test_when_finished "rm -rf head" &&
+	git clone . head &&
+	COMMIT_ID=$(git rev-parse HEAD) &&
+
+	git -C head fetch --porcelain --dry-run origin HEAD >actual &&
+	cat >expect <<-EOF &&
+	* $ZERO_OID $COMMIT_ID FETCH_HEAD
+	EOF
+	test_cmp expect actual &&
+
+	git -C head fetch --porcelain origin HEAD >actual &&
+	test_cmp expect actual &&
+
+	git -C head fetch --porcelain --dry-run origin HEAD:foo >actual &&
+	cat >expect <<-EOF &&
+	* $ZERO_OID $COMMIT_ID refs/heads/foo
+	EOF
+	test_cmp expect actual &&
+
+	git -C head fetch --porcelain origin HEAD:foo >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'fetch output with object ID' '
+	test_when_finished "rm -rf object-id" &&
+	git clone . object-id &&
+	commit=$(git rev-parse HEAD) &&
+
+	git -C object-id fetch --dry-run origin $commit:object-id >actual.out 2>actual.err &&
+	cat >expect <<-EOF &&
+	From $(test-tool path-utils real_path .)/.
+	 * [new ref]         $commit -> object-id
+	EOF
+	test_must_be_empty actual.out &&
+	test_cmp expect actual.err &&
+
+	git -C object-id fetch origin $commit:object-id >actual.out 2>actual.err &&
+	test_must_be_empty actual.out &&
+	test_cmp expect actual.err
+'
+
+test_expect_success '--no-show-forced-updates' '
+	mkdir forced-updates &&
+	(
+		cd forced-updates &&
+		git init &&
+		test_commit 1 &&
+		test_commit 2
+	) &&
+	git clone forced-updates forced-update-clone &&
+	git clone forced-updates no-forced-update-clone &&
+	git -C forced-updates reset --hard HEAD~1 &&
+	(
+		cd forced-update-clone &&
+		git fetch --show-forced-updates origin 2>output &&
+		test_grep "(forced update)" output
+	) &&
+	(
+		cd no-forced-update-clone &&
+		git fetch --no-show-forced-updates origin 2>output &&
+		test_grep ! "(forced update)" output
+	)
+'
+
+test_done
diff --git a/t/t5580-unc-paths.sh b/t/t5580-unc-paths.sh
index cf768b3..d7537a1 100755
--- a/t/t5580-unc-paths.sh
+++ b/t/t5580-unc-paths.sh
@@ -1,6 +1,10 @@
 #!/bin/sh
 
 test_description='various Windows-only path tests'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 if test_have_prereq CYGWIN
@@ -53,7 +57,7 @@ test_expect_success fetch '
 	git init to-fetch &&
 	(
 		cd to-fetch &&
-		git fetch "$UNCPATH" master
+		git fetch "$UNCPATH" main
 	)
 '
 
@@ -71,7 +75,7 @@ test_expect_success push '
 test_expect_success MINGW 'remote nick cannot contain backslashes' '
 	BACKSLASHED="$(winpwd | tr / \\\\)" &&
 	git ls-remote "$BACKSLASHED" 2>err &&
-	test_i18ngrep ! "unable to access" err
+	test_grep ! "unable to access" err
 '
 
 test_expect_success 'unc alternates' '
diff --git a/t/t5581-http-curl-verbose.sh b/t/t5581-http-curl-verbose.sh
index 927aad0..cded79c 100755
--- a/t/t5581-http-curl-verbose.sh
+++ b/t/t5581-http-curl-verbose.sh
@@ -1,6 +1,9 @@
 #!/bin/sh
 
 test_description='test GIT_CURL_VERBOSE'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-httpd.sh
 start_httpd
@@ -13,7 +16,7 @@ test_expect_success 'setup repository' '
 	git add file &&
 	git commit -m one &&
 	git remote add public "$HTTPD_DOCUMENT_ROOT_PATH/repo.git" &&
-	git push public master:master
+	git push public main:main
 '
 
 test_expect_success 'failure in git-upload-pack is shown' '
diff --git a/t/t5582-fetch-negative-refspec.sh b/t/t5582-fetch-negative-refspec.sh
new file mode 100755
index 0000000..7a80e47
--- /dev/null
+++ b/t/t5582-fetch-negative-refspec.sh
@@ -0,0 +1,285 @@
+#!/bin/sh
+# Copyright (c) 2020, Jacob Keller.
+
+test_description='"git fetch" with negative refspecs.
+
+'
+
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+. ./test-lib.sh
+
+test_expect_success setup '
+	echo >file original &&
+	git add file &&
+	git commit -a -m original
+'
+
+test_expect_success "clone and setup child repos" '
+	git clone . one &&
+	(
+		cd one &&
+		echo >file updated by one &&
+		git commit -a -m "updated by one" &&
+		git switch -c alternate &&
+		echo >file updated again by one &&
+		git commit -a -m "updated by one again" &&
+		git switch main
+	) &&
+	git clone . two &&
+	(
+		cd two &&
+		git config branch.main.remote one &&
+		git config remote.one.url ../one/.git/ &&
+		git config remote.one.fetch +refs/heads/*:refs/remotes/one/* &&
+		git config --add remote.one.fetch ^refs/heads/alternate
+	) &&
+	git clone . three
+'
+
+test_expect_success "fetch one" '
+	echo >file updated by origin &&
+	git commit -a -m "updated by origin" &&
+	(
+		cd two &&
+		test_must_fail git rev-parse --verify refs/remotes/one/alternate &&
+		git fetch one &&
+		test_must_fail git rev-parse --verify refs/remotes/one/alternate &&
+		git rev-parse --verify refs/remotes/one/main &&
+		mine=$(git rev-parse refs/remotes/one/main) &&
+		his=$(cd ../one && git rev-parse refs/heads/main) &&
+		test "z$mine" = "z$his"
+	)
+'
+
+test_expect_success "fetch with negative refspec on commandline" '
+	echo >file updated by origin again &&
+	git commit -a -m "updated by origin again" &&
+	(
+		cd three &&
+		alternate_in_one=$(cd ../one && git rev-parse refs/heads/alternate) &&
+		echo $alternate_in_one >expect &&
+		git fetch ../one/.git refs/heads/*:refs/remotes/one/* ^refs/heads/main &&
+		cut -f -1 .git/FETCH_HEAD >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success "fetch with negative sha1 refspec fails" '
+	echo >file updated by origin yet again &&
+	git commit -a -m "updated by origin yet again" &&
+	(
+		cd three &&
+		main_in_one=$(cd ../one && git rev-parse refs/heads/main) &&
+		test_must_fail git fetch ../one/.git refs/heads/*:refs/remotes/one/* ^$main_in_one
+	)
+'
+
+test_expect_success "fetch with negative pattern refspec" '
+	echo >file updated by origin once more &&
+	git commit -a -m "updated by origin once more" &&
+	(
+		cd three &&
+		alternate_in_one=$(cd ../one && git rev-parse refs/heads/alternate) &&
+		echo $alternate_in_one >expect &&
+		git fetch ../one/.git refs/heads/*:refs/remotes/one/* ^refs/heads/m* &&
+		cut -f -1 .git/FETCH_HEAD >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success "fetch with negative pattern refspec does not expand prefix" '
+	echo >file updated by origin another time &&
+	git commit -a -m "updated by origin another time" &&
+	(
+		cd three &&
+		alternate_in_one=$(cd ../one && git rev-parse refs/heads/alternate) &&
+		main_in_one=$(cd ../one && git rev-parse refs/heads/main) &&
+		echo $alternate_in_one >expect &&
+		echo $main_in_one >>expect &&
+		git fetch ../one/.git refs/heads/*:refs/remotes/one/* ^main &&
+		cut -f -1 .git/FETCH_HEAD >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success "fetch with negative refspec avoids duplicate conflict" '
+	(
+		cd one &&
+		git branch dups/a &&
+		git branch dups/b &&
+		git branch dups/c &&
+		git branch other/a &&
+		git rev-parse --verify refs/heads/other/a >../expect &&
+		git rev-parse --verify refs/heads/dups/b >>../expect &&
+		git rev-parse --verify refs/heads/dups/c >>../expect
+	) &&
+	(
+		cd three &&
+		git fetch ../one/.git ^refs/heads/dups/a refs/heads/dups/*:refs/dups/* refs/heads/other/a:refs/dups/a &&
+		git rev-parse --verify refs/dups/a >../actual &&
+		git rev-parse --verify refs/dups/b >>../actual &&
+		git rev-parse --verify refs/dups/c >>../actual
+	) &&
+	test_cmp expect actual
+'
+
+test_expect_success "push --prune with negative refspec" '
+	(
+		cd two &&
+		git branch prune/a &&
+		git branch prune/b &&
+		git branch prune/c &&
+		git push ../three refs/heads/prune/* &&
+		git branch -d prune/a &&
+		git branch -d prune/b &&
+		git push --prune ../three refs/heads/prune/* ^refs/heads/prune/b
+	) &&
+	(
+		cd three &&
+		test_write_lines b c >expect &&
+		git for-each-ref --format="%(refname:lstrip=3)" refs/heads/prune/ >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success "push --prune with negative refspec apply to the destination" '
+	(
+		cd two &&
+		git branch ours/a &&
+		git branch ours/b &&
+		git branch ours/c &&
+		git push ../three refs/heads/ours/*:refs/heads/theirs/* &&
+		git branch -d ours/a &&
+		git branch -d ours/b &&
+		git push --prune ../three refs/heads/ours/*:refs/heads/theirs/* ^refs/heads/theirs/b
+	) &&
+	(
+		cd three &&
+		test_write_lines b c >expect &&
+		git for-each-ref --format="%(refname:lstrip=3)" refs/heads/theirs/ >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success "fetch --prune with negative refspec" '
+	(
+		cd two &&
+		git branch fetch/a &&
+		git branch fetch/b &&
+		git branch fetch/c
+	) &&
+	(
+		cd three &&
+		git fetch ../two/.git refs/heads/fetch/*:refs/heads/copied/*
+	) &&
+	(
+		cd two &&
+		git branch -d fetch/a &&
+		git branch -d fetch/b
+	) &&
+	(
+		cd three &&
+		test_write_lines b c >expect &&
+		git fetch -v ../two/.git --prune refs/heads/fetch/*:refs/heads/copied/* ^refs/heads/fetch/b &&
+		git for-each-ref --format="%(refname:lstrip=3)" refs/heads/copied/ >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success "push with matching : and negative refspec" '
+	# Manually handle cleanup, since test_config is not
+	# prepared to take arbitrary options like --add
+	test_when_finished "test_unconfig -C two remote.one.push" &&
+
+	# For convenience, we use "master" to refer to the name of
+	# the branch created by default in the following.
+	#
+	# Repositories two and one have branches other than "master"
+	# but they have no overlap---"master" is the only one that
+	# is shared between them.  And the master branch at two is
+	# behind the master branch at one by one commit.
+	git -C two config --add remote.one.push : &&
+
+	# A matching push tries to update master, fails due to non-ff
+	test_must_fail git -C two push one &&
+
+	# "master" may actually not be "master"---find it out.
+	current=$(git symbolic-ref HEAD) &&
+
+	# If master is in negative refspec, then the command will not attempt
+	# to push and succeed.
+	git -C two config --add remote.one.push "^$current" &&
+
+	# With "master" excluded, this push is a no-op.  Nothing gets
+	# pushed and it succeeds.
+	git -C two push -v one
+'
+
+test_expect_success "push with matching +: and negative refspec" '
+	test_when_finished "test_unconfig -C two remote.one.push" &&
+
+	# The same set-up as above, whose side-effect was a no-op.
+	git -C two config --add remote.one.push +: &&
+
+	# The push refuses to update the "master" branch that is checked
+	# out in the "one" repository, even when it is forced with +:
+	test_must_fail git -C two push one &&
+
+	# "master" may actually not be "master"---find it out.
+	current=$(git symbolic-ref HEAD) &&
+
+	# If master is in negative refspec, then the command will not attempt
+	# to push and succeed
+	git -C two config --add remote.one.push "^$current" &&
+
+	# With "master" excluded, this push is a no-op.  Nothing gets
+	# pushed and it succeeds.
+	git -C two push -v one
+'
+
+test_expect_success '--prefetch correctly modifies refspecs' '
+	git -C one config --unset-all remote.origin.fetch &&
+	git -C one config --add remote.origin.fetch ^refs/heads/bogus/ignore &&
+	git -C one config --add remote.origin.fetch "refs/tags/*:refs/tags/*" &&
+	git -C one config --add remote.origin.fetch "refs/heads/bogus/*:bogus/*" &&
+
+	git tag -a -m never never-fetch-tag HEAD &&
+
+	git branch bogus/fetched HEAD~1 &&
+	git branch bogus/ignore HEAD &&
+
+	git -C one fetch --prefetch --no-tags &&
+	test_must_fail git -C one rev-parse never-fetch-tag &&
+	git -C one rev-parse refs/prefetch/bogus/fetched &&
+	test_must_fail git -C one rev-parse refs/prefetch/bogus/ignore &&
+
+	# correctly handle when refspec set becomes empty
+	# after removing the refs/tags/* refspec.
+	git -C one config --unset-all remote.origin.fetch &&
+	git -C one config --add remote.origin.fetch "refs/tags/*:refs/tags/*" &&
+
+	git -C one fetch --prefetch --no-tags &&
+	test_must_fail git -C one rev-parse never-fetch-tag &&
+
+	# The refspec for refs that are not fully qualified
+	# are filtered multiple times.
+	git -C one rev-parse refs/prefetch/bogus/fetched &&
+	test_must_fail git -C one rev-parse refs/prefetch/bogus/ignore
+'
+
+test_expect_success '--prefetch succeeds when refspec becomes empty' '
+	git checkout bogus/fetched &&
+	test_commit extra &&
+
+	git -C one config --unset-all remote.origin.fetch &&
+	git -C one config --unset branch.main.remote &&
+	git -C one config remote.origin.fetch "+refs/tags/extra" &&
+	git -C one config remote.origin.skipfetchall true &&
+	git -C one config remote.origin.tagopt "--no-tags" &&
+
+	git -C one fetch --prefetch
+'
+
+test_done
diff --git a/t/t5583-push-branches.sh b/t/t5583-push-branches.sh
new file mode 100755
index 0000000..320f49c
--- /dev/null
+++ b/t/t5583-push-branches.sh
@@ -0,0 +1,116 @@
+#!/bin/sh
+
+test_description='check the consisitency of behavior of --all and --branches'
+
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+delete_refs() {
+	dir=$1
+	shift
+	rm -rf deletes
+	for arg in $*
+	do
+		echo "delete ${arg}" >>deletes
+	done
+	git -C $dir update-ref --stdin < deletes
+}
+
+test_expect_success 'setup bare remote' '
+	git init --bare remote-1 &&
+	git -C remote-1 config gc.auto 0 &&
+	test_commit one &&
+	git push remote-1 HEAD
+'
+
+test_expect_success 'setup different types of references' '
+	cat >refs <<-EOF &&
+	update refs/heads/branch-1 HEAD
+	update refs/heads/branch-2 HEAD
+	EOF
+
+	git tag -a -m "annotated" annotated-1 HEAD &&
+	git tag -a -m "annotated" annotated-2 HEAD &&
+	git update-ref --stdin < refs
+'
+
+test_expect_success '--all and --branches have the same behavior' '
+	test_when_finished "delete_refs remote-1 \
+			   refs/heads/branch-1 \
+			   refs/heads/branch-2" &&
+	git push remote-1 --all &&
+	commit=$(git rev-parse HEAD) &&
+	cat >expect <<-EOF &&
+	$commit refs/heads/branch-1
+	$commit refs/heads/branch-2
+	$commit refs/heads/main
+	EOF
+
+	git -C remote-1 show-ref --heads >actual.all &&
+	delete_refs remote-1 refs/heads/branch-1 refs/heads/branch-2 &&
+	git push remote-1 --branches &&
+	git -C remote-1 show-ref --heads >actual.branches &&
+	test_cmp actual.all actual.branches &&
+	test_cmp expect actual.all
+'
+
+test_expect_success '--all or --branches can not be combined with refspecs' '
+	test_must_fail git push remote-1 --all main >actual.all 2>&1 &&
+	test_must_fail git push remote-1 --branches main >actual.branches 2>&1 &&
+	test_cmp actual.all actual.branches &&
+	grep "be combined with refspecs" actual.all
+'
+
+test_expect_success '--all or --branches can not be combined with --mirror' '
+	test_must_fail git push remote-1 --all --mirror >actual.all 2>&1 &&
+	test_must_fail git push remote-1 --branches --mirror >actual.branches 2>&1 &&
+	test_cmp actual.all actual.branches &&
+	grep "cannot be used together" actual.all
+'
+
+test_expect_success '--all or --branches can not be combined with --tags' '
+	test_must_fail git push remote-1 --all --tags >actual.all 2>&1 &&
+	test_must_fail git push remote-1 --branches --tags >actual.branches 2>&1 &&
+	test_cmp actual.all actual.branches &&
+	grep "cannot be used together" actual.all
+'
+
+
+test_expect_success '--all or --branches can not be combined with --delete' '
+	test_must_fail git push remote-1 --all --delete >actual.all 2>&1 &&
+	test_must_fail git push remote-1 --branches --delete >actual.branches 2>&1 &&
+	test_cmp actual.all actual.branches &&
+	grep "cannot be used together" actual.all
+'
+
+test_expect_success '--all or --branches combines with --follow-tags have same behavior' '
+	test_when_finished "delete_refs remote-1 \
+			   refs/heads/branch-1 \
+			   refs/heads/branch-2 \
+			   refs/tags/annotated-1 \
+			   refs/tags/annotated-2" &&
+	git push remote-1 --all --follow-tags &&
+	git -C remote-1 show-ref > actual.all &&
+	cat >expect <<-EOF &&
+	$commit refs/heads/branch-1
+	$commit refs/heads/branch-2
+	$commit refs/heads/main
+	$(git rev-parse annotated-1) refs/tags/annotated-1
+	$(git rev-parse annotated-2) refs/tags/annotated-2
+	EOF
+
+	delete_refs remote-1 \
+		    refs/heads/branch-1 \
+		    refs/heads/branch-2 \
+		    refs/tags/annotated-1 \
+		    refs/tags/annotated-2 &&
+	git push remote-1 --branches --follow-tags &&
+	git -C remote-1 show-ref >actual.branches &&
+	test_cmp actual.all actual.branches &&
+	test_cmp expect actual.all
+'
+
+test_done
diff --git a/t/t5600-clone-fail-cleanup.sh b/t/t5600-clone-fail-cleanup.sh
index 4a1a912..c814afa 100755
--- a/t/t5600-clone-fail-cleanup.sh
+++ b/t/t5600-clone-fail-cleanup.sh
@@ -13,6 +13,7 @@ Unless the directory already exists, in which case we clean up only what we
 wrote.
 '
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 corrupt_repo () {
@@ -35,7 +36,9 @@ test_expect_success 'create a repo to clone' '
 '
 
 test_expect_success 'create objects in repo for later corruption' '
-	test_commit -C foo file
+	test_commit -C foo file &&
+	git -C foo checkout --detach &&
+	test_commit -C foo detached
 '
 
 # source repository given to git clone should be relative to the
@@ -97,4 +100,11 @@ test_expect_success 'failed clone into empty leaves directory (separate, wt)' '
 	test_dir_is_empty empty-wt
 '
 
+test_expect_success 'transport failure cleans up directory' '
+	test_must_fail git clone --no-local \
+		-u "f() { git-upload-pack \"\$@\"; return 1; }; f" \
+		foo broken-clone &&
+	test_path_is_missing broken-clone
+'
+
 test_done
diff --git a/t/t5601-clone.sh b/t/t5601-clone.sh
index eb9a093..ca43185 100755
--- a/t/t5601-clone.sh
+++ b/t/t5601-clone.sh
@@ -2,6 +2,9 @@
 
 test_description=clone
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 X=
@@ -37,7 +40,7 @@ test_expect_success 'clone with excess parameters (2)' '
 
 '
 
-test_expect_success C_LOCALE_OUTPUT 'output from clone' '
+test_expect_success 'output from clone' '
 	rm -fr dst &&
 	git clone -n "file://$(pwd)/src" dst >output 2>&1 &&
 	test $(grep Clon output | wc -l) = 1
@@ -76,12 +79,10 @@ test_expect_success 'clone from hooks' '
 	cd .. &&
 	git init r1 &&
 	cd r1 &&
-	cat >.git/hooks/pre-commit <<-\EOF &&
-	#!/bin/sh
+	test_hook pre-commit <<-\EOF &&
 	git clone ../r0 ../r2
 	exit 1
 	EOF
-	chmod u+x .git/hooks/pre-commit &&
 	: >file &&
 	git add file &&
 	test_must_fail git commit -m invoke-hook &&
@@ -156,6 +157,23 @@ test_expect_success 'clone --mirror does not repeat tags' '
 
 '
 
+test_expect_success 'clone with files ref format' '
+	test_when_finished "rm -rf ref-storage" &&
+	git clone --ref-format=files --mirror src ref-storage &&
+	echo files >expect &&
+	git -C ref-storage rev-parse --show-ref-format >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'clone with garbage ref format' '
+	cat >expect <<-EOF &&
+	fatal: unknown ref storage format ${SQ}garbage${SQ}
+	EOF
+	test_must_fail git clone --ref-format=garbage --mirror src ref-storage 2>err &&
+	test_cmp expect err &&
+	test_path_is_missing ref-storage
+'
+
 test_expect_success 'clone to destination with trailing /' '
 
 	git clone src target-1/ &&
@@ -217,7 +235,7 @@ test_expect_success 'clone respects global branch.autosetuprebase' '
 		rm -fr dst &&
 		git clone src dst &&
 		cd dst &&
-		actual="z$(git config branch.master.rebase)" &&
+		actual="z$(git config branch.main.rebase)" &&
 		test ztrue = $actual
 	)
 '
@@ -302,7 +320,8 @@ test_expect_success 'clone from original with relative alternate' '
 test_expect_success 'clone checking out a tag' '
 	git clone --branch=some-tag src dst.tag &&
 	GIT_DIR=src/.git git rev-parse some-tag >expected &&
-	test_cmp expected dst.tag/.git/HEAD &&
+	GIT_DIR=dst.tag/.git git rev-parse HEAD >actual &&
+	test_cmp expected actual &&
 	GIT_DIR=dst.tag/.git git config remote.origin.fetch >fetch.actual &&
 	echo "+refs/heads/*:refs/remotes/origin/*" >fetch.expected &&
 	test_cmp fetch.expected fetch.actual
@@ -591,7 +610,7 @@ test_expect_success 'clone from a repository with two identical branches' '
 
 	(
 		cd src &&
-		git checkout -b another master
+		git checkout -b another main
 	) &&
 	git clone src target-11 &&
 	test "z$( cd target-11 && git symbolic-ref HEAD )" = zrefs/heads/another
@@ -628,7 +647,21 @@ test_expect_success 'clone on case-insensitive fs' '
 test_expect_success CASE_INSENSITIVE_FS 'colliding file detection' '
 	grep X icasefs/warning &&
 	grep x icasefs/warning &&
-	test_i18ngrep "the following paths have collided" icasefs/warning
+	test_grep "the following paths have collided" icasefs/warning
+'
+
+test_expect_success 'clone with GIT_DEFAULT_HASH' '
+	(
+		sane_unset GIT_DEFAULT_HASH &&
+		git init --object-format=sha1 test-sha1 &&
+		git init --object-format=sha256 test-sha256
+	) &&
+	test_commit -C test-sha1 foo &&
+	test_commit -C test-sha256 foo &&
+	GIT_DEFAULT_HASH=sha1 git clone test-sha256 test-clone-sha256 &&
+	GIT_DEFAULT_HASH=sha256 git clone test-sha1 test-clone-sha1 &&
+	git -C test-clone-sha1 status &&
+	git -C test-clone-sha256 status
 '
 
 partial_clone_server () {
@@ -669,7 +702,8 @@ test_expect_success 'partial clone' '
 
 test_expect_success 'partial clone with -o' '
 	partial_clone_server server &&
-	git clone -o blah --filter=blob:limit=0 "file://$(pwd)/server" client
+	git clone -o blah --filter=blob:limit=0 "file://$(pwd)/server" client &&
+	test_cmp_config -C client "blob:limit=0" --get-all remote.blah.partialclonefilter
 '
 
 test_expect_success 'partial clone: warn if server does not support object filtering' '
@@ -679,7 +713,7 @@ test_expect_success 'partial clone: warn if server does not support object filte
 
 	git clone --filter=blob:limit=0 "file://$(pwd)/server" client 2> err &&
 
-	test_i18ngrep "filtering not recognized by server" err
+	test_grep "filtering not recognized by server" err
 '
 
 test_expect_success 'batch missing blob request during checkout' '
@@ -703,8 +737,12 @@ test_expect_success 'batch missing blob request during checkout' '
 
 	# Ensure that there is only one negotiation by checking that there is
 	# only "done" line sent. ("done" marks the end of negotiation.)
-	GIT_TRACE_PACKET="$(pwd)/trace" git -C client checkout HEAD^ &&
-	grep "git> done" trace >done_lines &&
+	GIT_TRACE_PACKET="$(pwd)/trace" \
+		GIT_TRACE2_EVENT="$(pwd)/trace2_event" \
+		git -C client -c trace2.eventNesting=5 checkout HEAD^ &&
+	grep \"key\":\"total_rounds\",\"value\":\"1\" trace2_event >trace_lines &&
+	test_line_count = 1 trace_lines &&
+	grep "fetch> done" trace >done_lines &&
 	test_line_count = 1 done_lines
 '
 
@@ -723,6 +761,7 @@ test_expect_success 'batch missing blob request does not inadvertently try to fe
 	echo aa >server/a &&
 	echo bb >server/b &&
 	# Also add a gitlink pointing to an arbitrary repository
+	test_config_global protocol.file.allow always &&
 	git -C server submodule add "$(pwd)/repo_for_submodule" c &&
 	git -C server add a b c &&
 	git -C server commit -m x &&
@@ -737,10 +776,136 @@ test_expect_success 'batch missing blob request does not inadvertently try to fe
 . "$TEST_DIRECTORY"/lib-httpd.sh
 start_httpd
 
+test_expect_success 'clone with includeIf' '
+	test_when_finished "rm -rf repo \"$HTTPD_DOCUMENT_ROOT_PATH/repo.git\"" &&
+	git clone --bare --no-local src "$HTTPD_DOCUMENT_ROOT_PATH/repo.git" &&
+
+	test_when_finished "rm \"$HOME\"/.gitconfig" &&
+	cat >"$HOME"/.gitconfig <<-EOF &&
+	[includeIf "onbranch:something"]
+		path = /does/not/exist.inc
+	EOF
+	git clone $HTTPD_URL/smart/repo.git repo
+'
+
 test_expect_success 'partial clone using HTTP' '
 	partial_clone "$HTTPD_DOCUMENT_ROOT_PATH/server" "$HTTPD_URL/smart/server"
 '
 
+test_expect_success 'reject cloning shallow repository using HTTP' '
+	test_when_finished "rm -rf repo" &&
+	git clone --bare --no-local --depth=1 src "$HTTPD_DOCUMENT_ROOT_PATH/repo.git" &&
+	test_must_fail git -c protocol.version=2 clone --reject-shallow $HTTPD_URL/smart/repo.git repo 2>err &&
+	test_grep -e "source repository is shallow, reject to clone." err &&
+
+	git clone --no-reject-shallow $HTTPD_URL/smart/repo.git repo
+'
+
+test_expect_success 'auto-discover bundle URI from HTTP clone' '
+	test_when_finished rm -rf trace.txt repo2 "$HTTPD_DOCUMENT_ROOT_PATH/repo2.git" &&
+	git -C src bundle create "$HTTPD_DOCUMENT_ROOT_PATH/everything.bundle" --all &&
+	git clone --bare --no-local src "$HTTPD_DOCUMENT_ROOT_PATH/repo2.git" &&
+
+	git -C "$HTTPD_DOCUMENT_ROOT_PATH/repo2.git" config \
+		uploadpack.advertiseBundleURIs true &&
+	git -C "$HTTPD_DOCUMENT_ROOT_PATH/repo2.git" config \
+		bundle.version 1 &&
+	git -C "$HTTPD_DOCUMENT_ROOT_PATH/repo2.git" config \
+		bundle.mode all &&
+	git -C "$HTTPD_DOCUMENT_ROOT_PATH/repo2.git" config \
+		bundle.everything.uri "$HTTPD_URL/everything.bundle" &&
+
+	GIT_TRACE2_EVENT="$(pwd)/trace.txt" \
+		git -c protocol.version=2 \
+		    -c transfer.bundleURI=true clone \
+		$HTTPD_URL/smart/repo2.git repo2 &&
+	cat >pattern <<-EOF &&
+	"event":"child_start".*"argv":\["git-remote-https","$HTTPD_URL/everything.bundle"\]
+	EOF
+	grep -f pattern trace.txt
+'
+
+test_expect_success 'auto-discover multiple bundles from HTTP clone' '
+	test_when_finished rm -rf trace.txt repo3 "$HTTPD_DOCUMENT_ROOT_PATH/repo3.git" &&
+
+	test_commit -C src new &&
+	git -C src bundle create "$HTTPD_DOCUMENT_ROOT_PATH/new.bundle" HEAD~1..HEAD &&
+	git clone --bare --no-local src "$HTTPD_DOCUMENT_ROOT_PATH/repo3.git" &&
+
+	git -C "$HTTPD_DOCUMENT_ROOT_PATH/repo3.git" config \
+		uploadpack.advertiseBundleURIs true &&
+	git -C "$HTTPD_DOCUMENT_ROOT_PATH/repo3.git" config \
+		bundle.version 1 &&
+	git -C "$HTTPD_DOCUMENT_ROOT_PATH/repo3.git" config \
+		bundle.mode all &&
+
+	git -C "$HTTPD_DOCUMENT_ROOT_PATH/repo3.git" config \
+		bundle.everything.uri "$HTTPD_URL/everything.bundle" &&
+	git -C "$HTTPD_DOCUMENT_ROOT_PATH/repo3.git" config \
+		bundle.new.uri "$HTTPD_URL/new.bundle" &&
+
+	GIT_TRACE2_EVENT="$(pwd)/trace.txt" \
+		git -c protocol.version=2 \
+		    -c transfer.bundleURI=true clone \
+		$HTTPD_URL/smart/repo3.git repo3 &&
+
+	# We should fetch _both_ bundles
+	cat >pattern <<-EOF &&
+	"event":"child_start".*"argv":\["git-remote-https","$HTTPD_URL/everything.bundle"\]
+	EOF
+	grep -f pattern trace.txt &&
+	cat >pattern <<-EOF &&
+	"event":"child_start".*"argv":\["git-remote-https","$HTTPD_URL/new.bundle"\]
+	EOF
+	grep -f pattern trace.txt
+'
+
+test_expect_success 'auto-discover multiple bundles from HTTP clone: creationToken heuristic' '
+	test_when_finished rm -rf "$HTTPD_DOCUMENT_ROOT_PATH/repo4.git" &&
+	test_when_finished rm -rf clone-heuristic trace*.txt &&
+
+	test_commit -C src newest &&
+	git -C src bundle create "$HTTPD_DOCUMENT_ROOT_PATH/newest.bundle" HEAD~1..HEAD &&
+	git clone --bare --no-local src "$HTTPD_DOCUMENT_ROOT_PATH/repo4.git" &&
+
+	cat >>"$HTTPD_DOCUMENT_ROOT_PATH/repo4.git/config" <<-EOF &&
+	[uploadPack]
+		advertiseBundleURIs = true
+
+	[bundle]
+		version = 1
+		mode = all
+		heuristic = creationToken
+
+	[bundle "everything"]
+		uri = $HTTPD_URL/everything.bundle
+		creationtoken = 1
+
+	[bundle "new"]
+		uri = $HTTPD_URL/new.bundle
+		creationtoken = 2
+
+	[bundle "newest"]
+		uri = $HTTPD_URL/newest.bundle
+		creationtoken = 3
+	EOF
+
+	GIT_TRACE2_EVENT="$(pwd)/trace-clone.txt" \
+		git -c protocol.version=2 \
+		    -c transfer.bundleURI=true clone \
+		"$HTTPD_URL/smart/repo4.git" clone-heuristic &&
+
+	cat >expect <<-EOF &&
+	$HTTPD_URL/newest.bundle
+	$HTTPD_URL/new.bundle
+	$HTTPD_URL/everything.bundle
+	EOF
+
+	# We should fetch all bundles in the expected order.
+	test_remote_https_urls <trace-clone.txt >actual &&
+	test_cmp expect actual
+'
+
 # DO NOT add non-httpd-specific tests here, because the last part of this
 # test script is only executed when httpd is available and enabled.
 
diff --git a/t/t5602-clone-remote-exec.sh b/t/t5602-clone-remote-exec.sh
index cbcceab..56329aa 100755
--- a/t/t5602-clone-remote-exec.sh
+++ b/t/t5602-clone-remote-exec.sh
@@ -2,6 +2,7 @@
 
 test_description=clone
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
diff --git a/t/t5603-clone-dirname.sh b/t/t5603-clone-dirname.sh
index 13b5e5e..8ca1f09 100755
--- a/t/t5603-clone-dirname.sh
+++ b/t/t5603-clone-dirname.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='check output directory names used by git-clone'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # we use a fake ssh wrapper that ignores the arguments
diff --git a/t/t5604-clone-reference.sh b/t/t5604-clone-reference.sh
index 2f7be23..9b32db8 100755
--- a/t/t5604-clone-reference.sh
+++ b/t/t5604-clone-reference.sh
@@ -4,6 +4,10 @@
 #
 
 test_description='test clone --reference'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 base_dir=$(pwd)
@@ -49,7 +53,7 @@ test_expect_success 'existence of info/alternates' '
 '
 
 test_expect_success 'pulling from reference' '
-	git -C C pull ../B master
+	git -C C pull ../B main
 '
 
 test_expect_success 'that reference gets used' '
@@ -70,7 +74,7 @@ test_expect_success 'existence of info/alternates' '
 '
 
 test_expect_success 'pulling from reference' '
-	git -C D pull ../B master
+	git -C D pull ../B main
 '
 
 test_expect_success 'that reference gets used' '
@@ -84,7 +88,7 @@ test_expect_success 'updating origin' '
 '
 
 test_expect_success 'pulling changes from origin' '
-	git -C C pull origin
+	git -C C pull --no-rebase origin
 '
 
 # the 2 local objects are commit and tree from the merge
@@ -93,7 +97,7 @@ test_expect_success 'that alternate to origin gets used' '
 '
 
 test_expect_success 'pulling changes from origin' '
-	git -C D pull origin
+	git -C D pull --no-rebase origin
 '
 
 # the 5 local objects are expected; file3 blob, commit in A to add it
@@ -136,11 +140,11 @@ test_expect_success 'prepare branched repository' '
 	git clone A J &&
 	(
 		cd J &&
-		git checkout -b other master^ &&
+		git checkout -b other main^ &&
 		echo other >otherfile &&
 		git add otherfile &&
 		git commit -m other &&
-		git checkout master
+		git checkout main
 	)
 '
 
@@ -152,9 +156,9 @@ test_expect_success 'fetch with incomplete alternates' '
 		git remote add J "file://$base_dir/J" &&
 		GIT_TRACE_PACKET=$U.K git fetch J
 	) &&
-	master_object=$(cd A && git for-each-ref --format="%(objectname)" refs/heads/master) &&
+	main_object=$(cd A && git for-each-ref --format="%(objectname)" refs/heads/main) &&
 	test -s "$U.K" &&
-	! grep " want $master_object" "$U.K" &&
+	! grep " want $main_object" "$U.K" &&
 	tag_object=$(cd A && git for-each-ref --format="%(objectname)" refs/tags/HEAD) &&
 	! grep " want $tag_object" "$U.K"
 '
@@ -300,8 +304,6 @@ test_expect_success SYMLINKS 'setup repo with manually symlinked or unknown file
 		ln -s ../an-object $obj &&
 
 		cd ../ &&
-		find . -type f | sort >../../../T.objects-files.raw &&
-		find . -type l | sort >../../../T.objects-symlinks.raw &&
 		echo unknown_content >unknown_file
 	) &&
 	git -C T fsck &&
@@ -310,49 +312,53 @@ test_expect_success SYMLINKS 'setup repo with manually symlinked or unknown file
 
 
 test_expect_success SYMLINKS 'clone repo with symlinked or unknown files at objects/' '
-	for option in --local --no-hardlinks --shared --dissociate
+	# None of these options work when cloning locally, since T has
+	# symlinks in its `$GIT_DIR/objects` directory
+	for option in --local --no-hardlinks --dissociate
 	do
-		git clone $option T T$option || return 1 &&
-		git -C T$option fsck || return 1 &&
-		git -C T$option rev-list --all --objects >T$option.objects &&
-		test_cmp T.objects T$option.objects &&
-		(
-			cd T$option/.git/objects &&
-			find . -type f | sort >../../../T$option.objects-files.raw &&
-			find . -type l | sort >../../../T$option.objects-symlinks.raw
-		)
+		test_must_fail git clone $option T T$option 2>err || return 1 &&
+		test_grep "symlink.*exists" err || return 1
 	done &&
 
+	# But `--shared` clones should still work, even when specifying
+	# a local path *and* that repository has symlinks present in its
+	# `$GIT_DIR/objects` directory.
+	git clone --shared T T--shared &&
+	git -C T--shared fsck &&
+	git -C T--shared rev-list --all --objects >T--shared.objects &&
+	test_cmp T.objects T--shared.objects &&
+	(
+		cd T--shared/.git/objects &&
+		find . -type f | sort >../../../T--shared.objects-files.raw &&
+		find . -type l | sort >../../../T--shared.objects-symlinks.raw
+	) &&
+
 	for raw in $(ls T*.raw)
 	do
 		sed -e "s!/../!/Y/!; s![0-9a-f]\{38,\}!Z!" -e "/commit-graph/d" \
-		    -e "/multi-pack-index/d" <$raw >$raw.de-sha-1 &&
+		    -e "/multi-pack-index/d" -e "/rev/d" <$raw >$raw.de-sha-1 &&
 		sort $raw.de-sha-1 >$raw.de-sha || return 1
 	done &&
 
-	cat >expected-files <<-EOF &&
-	./Y/Z
-	./Y/Z
-	./Y/Z
-	./a-loose-dir/Z
-	./an-object
-	./info/packs
-	./pack/pack-Z.idx
-	./pack/pack-Z.pack
-	./packs/pack-Z.idx
-	./packs/pack-Z.pack
-	./unknown_file
-	EOF
-
-	for option in --local --no-hardlinks --dissociate
-	do
-		test_cmp expected-files T$option.objects-files.raw.de-sha || return 1 &&
-		test_must_be_empty T$option.objects-symlinks.raw.de-sha || return 1
-	done &&
-
 	echo ./info/alternates >expected-files &&
 	test_cmp expected-files T--shared.objects-files.raw &&
 	test_must_be_empty T--shared.objects-symlinks.raw
 '
 
+test_expect_success SYMLINKS 'clone repo with symlinked objects directory' '
+	test_when_finished "rm -fr sensitive malicious" &&
+
+	mkdir -p sensitive &&
+	echo "secret" >sensitive/file &&
+
+	git init malicious &&
+	rm -fr malicious/.git/objects &&
+	ln -s "$(pwd)/sensitive" ./malicious/.git/objects &&
+
+	test_must_fail git clone --local malicious clone 2>err &&
+
+	test_path_is_missing clone &&
+	grep "is a symlink, refusing to clone with --local" err
+'
+
 test_done
diff --git a/t/t5605-clone-local.sh b/t/t5605-clone-local.sh
index af23419..a305586 100755
--- a/t/t5605-clone-local.sh
+++ b/t/t5605-clone-local.sh
@@ -1,6 +1,9 @@
 #!/bin/sh
 
 test_description='test local clone'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 repo_is_hardlinked() {
@@ -12,19 +15,27 @@ test_expect_success 'preparing origin repository' '
 	: >file && git add . && git commit -m1 &&
 	git clone --bare . a.git &&
 	git clone --bare . x &&
-	test "$(cd a.git && git config --bool core.bare)" = true &&
-	test "$(cd x && git config --bool core.bare)" = true &&
+	echo true >expect &&
+	git -C a.git config --bool core.bare >actual &&
+	test_cmp expect actual &&
+	echo true >expect &&
+	git -C x config --bool core.bare >actual &&
+	test_cmp expect actual &&
 	git bundle create b1.bundle --all &&
-	git bundle create b2.bundle master &&
+	git bundle create b2.bundle main &&
 	mkdir dir &&
 	cp b1.bundle dir/b3 &&
-	cp b1.bundle b4
+	cp b1.bundle b4 &&
+	git branch not-main main &&
+	git bundle create b5.bundle not-main
 '
 
 test_expect_success 'local clone without .git suffix' '
 	git clone -l -s a b &&
 	(cd b &&
-	test "$(git config --bool core.bare)" = false &&
+	echo false >expect &&
+	git config --bool core.bare >actual &&
+	test_cmp expect actual &&
 	git fetch)
 '
 
@@ -54,11 +65,11 @@ test_expect_success 'Even without -l, local will make a hardlink' '
 '
 
 test_expect_success 'local clone of repo with nonexistent ref in HEAD' '
-	echo "ref: refs/heads/nonexistent" > a.git/HEAD &&
+	git -C a.git symbolic-ref HEAD refs/heads/nonexistent &&
 	git clone a d &&
 	(cd d &&
 	git fetch &&
-	test ! -e .git/refs/remotes/origin/HEAD)
+	test_ref_missing refs/remotes/origin/HEAD)
 '
 
 test_expect_success 'bundle clone without .bundle suffix' '
@@ -80,11 +91,19 @@ test_expect_success 'bundle clone from b4.bundle that does not exist' '
 	test_must_fail git clone b4.bundle bb
 '
 
-test_expect_success 'bundle clone with nonexistent HEAD' '
+test_expect_success 'bundle clone with nonexistent HEAD (match default)' '
 	git clone b2.bundle b2 &&
 	(cd b2 &&
 	git fetch &&
-	test_must_fail git rev-parse --verify refs/heads/master)
+	git rev-parse --verify refs/heads/main)
+'
+
+test_expect_success 'bundle clone with nonexistent HEAD (no match default)' '
+	git clone b5.bundle b5 &&
+	(cd b5 &&
+	git fetch &&
+	test_must_fail git rev-parse --verify refs/heads/main &&
+	test_must_fail git rev-parse --verify refs/heads/not-main)
 '
 
 test_expect_success 'clone empty repository' '
@@ -98,9 +117,9 @@ test_expect_success 'clone empty repository' '
 	 echo "content" >> foo &&
 	 git add foo &&
 	 git commit -m "Initial commit" &&
-	 git push origin master &&
-	 expected=$(git rev-parse master) &&
-	 actual=$(git --git-dir=../empty/.git rev-parse master) &&
+	 git push origin main &&
+	 expected=$(git rev-parse main) &&
+	 actual=$(git --git-dir=../empty/.git rev-parse main) &&
 	 test $actual = $expected)
 '
 
@@ -138,4 +157,13 @@ test_expect_success 'cloning locally respects "-u" for fetching refs' '
 	test_must_fail git clone --bare -u false a should_not_work.git
 '
 
+test_expect_success REFFILES 'local clone from repo with corrupt refs fails gracefully' '
+	git init corrupt &&
+	test_commit -C corrupt one &&
+	echo a >corrupt/.git/refs/heads/topic &&
+
+	test_must_fail git clone corrupt working 2>err &&
+	grep "has a null OID" err
+'
+
 test_done
diff --git a/t/t5606-clone-options.sh b/t/t5606-clone-options.sh
index e69427f..e93e0d0 100755
--- a/t/t5606-clone-options.sh
+++ b/t/t5606-clone-options.sh
@@ -1,6 +1,10 @@
 #!/bin/sh
 
 test_description='basic clone options'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -8,14 +12,136 @@ test_expect_success 'setup' '
 	mkdir parent &&
 	(cd parent && git init &&
 	 echo one >file && git add file &&
-	 git commit -m one)
+	 git commit -m one) &&
+	git clone --depth=1 --no-local parent shallow-repo
+
+'
+
+test_expect_success 'submodule.stickyRecursiveClone flag manipulates submodule.recurse value' '
+
+	test_config_global submodule.stickyRecursiveClone true &&
+	git clone --recurse-submodules parent clone_recurse_true &&
+	test_cmp_config -C clone_recurse_true true submodule.recurse &&
+
+	test_config_global submodule.stickyRecursiveClone false &&
+	git clone --recurse-submodules parent clone_recurse_false &&
+	test_expect_code 1 git -C clone_recurse_false config --get submodule.recurse
 
 '
 
 test_expect_success 'clone -o' '
 
 	git clone -o foo parent clone-o &&
-	(cd clone-o && git rev-parse --verify refs/remotes/foo/master)
+	git -C clone-o rev-parse --verify refs/remotes/foo/main
+
+'
+
+test_expect_success 'rejects invalid -o/--origin' '
+
+	test_must_fail git clone -o "bad...name" parent clone-bad-name 2>err &&
+	test_grep "'\''bad...name'\'' is not a valid remote name" err
+
+'
+
+test_expect_success 'clone --bare -o' '
+
+	git clone -o foo --bare parent clone-bare-o &&
+	(cd parent && pwd) >expect &&
+	git -C clone-bare-o config remote.foo.url >actual &&
+	test_cmp expect actual
+
+'
+
+test_expect_success 'disallows --bare with --separate-git-dir' '
+
+	test_must_fail git clone --bare --separate-git-dir dot-git-destiation parent clone-bare-sgd 2>err &&
+	test_debug "cat err" &&
+	test_grep -e "options .--bare. and .--separate-git-dir. cannot be used together" err
+
+'
+
+test_expect_success 'disallows --bundle-uri with shallow options' '
+	for option in --depth=1 --shallow-since=01-01-2000 --shallow-exclude=HEAD
+	do
+		test_must_fail git clone --bundle-uri=bundle $option from to 2>err &&
+		grep "bundle-uri.* cannot be used together" err || return 1
+	done
+'
+
+test_expect_success 'reject cloning shallow repository' '
+	test_when_finished "rm -rf repo" &&
+	test_must_fail git clone --reject-shallow shallow-repo out 2>err &&
+	test_grep -e "source repository is shallow, reject to clone." err &&
+
+	git clone --no-reject-shallow shallow-repo repo
+'
+
+test_expect_success 'reject cloning non-local shallow repository' '
+	test_when_finished "rm -rf repo" &&
+	test_must_fail git clone --reject-shallow --no-local shallow-repo out 2>err &&
+	test_grep -e "source repository is shallow, reject to clone." err &&
+
+	git clone --no-reject-shallow --no-local shallow-repo repo
+'
+
+test_expect_success 'succeed cloning normal repository' '
+	test_when_finished "rm -rf chilad1 child2 child3 child4 " &&
+	git clone --reject-shallow parent child1 &&
+	git clone --reject-shallow --no-local parent child2 &&
+	git clone --no-reject-shallow parent child3 &&
+	git clone --no-reject-shallow --no-local parent child4
+'
+
+test_expect_success 'uses "origin" for default remote name' '
+
+	git clone parent clone-default-origin &&
+	git -C clone-default-origin rev-parse --verify refs/remotes/origin/main
+
+'
+
+test_expect_success 'prefers --template config over normal config' '
+
+	template="$TRASH_DIRECTORY/template-with-config" &&
+	mkdir "$template" &&
+	git config --file "$template/config" foo.bar from_template &&
+	test_config_global foo.bar from_global &&
+	git clone "--template=$template" parent clone-template-config &&
+	test "$(git -C clone-template-config config --local foo.bar)" = "from_template"
+
+'
+
+test_expect_success 'prefers -c config over --template config' '
+
+	template="$TRASH_DIRECTORY/template-with-ignored-config" &&
+	mkdir "$template" &&
+	git config --file "$template/config" foo.bar from_template &&
+	git clone "--template=$template" -c foo.bar=inline parent clone-template-inline-config &&
+	test "$(git -C clone-template-inline-config config --local foo.bar)" = "inline"
+
+'
+
+test_expect_success 'ignore --template config for core.bare' '
+
+	template="$TRASH_DIRECTORY/template-with-bare-config" &&
+	mkdir "$template" &&
+	git config --file "$template/config" core.bare true &&
+	git clone "--template=$template" parent clone-bare-config &&
+	test "$(git -C clone-bare-config config --local core.bare)" = "false" &&
+	test_path_is_missing clone-bare-config/HEAD
+'
+
+test_expect_success 'prefers config "clone.defaultRemoteName" over default' '
+
+	test_config_global clone.defaultRemoteName from_config &&
+	git clone parent clone-config-origin &&
+	git -C clone-config-origin rev-parse --verify refs/remotes/from_config/main
+
+'
+
+test_expect_success 'prefers --origin over -c config' '
+
+	git clone -c clone.defaultRemoteName=inline --origin from_option parent clone-o-and-inline-config &&
+	git -C clone-o-and-inline-config rev-parse --verify refs/remotes/from_option/main
 
 '
 
@@ -23,7 +149,7 @@ test_expect_success 'redirected clone does not show progress' '
 
 	git clone "file://$(pwd)/parent" clone-redirected >out 2>err &&
 	! grep % err &&
-	test_i18ngrep ! "Checking connectivity" err
+	test_grep ! "Checking connectivity" err
 
 '
 
@@ -35,11 +161,22 @@ test_expect_success 'redirected clone -v does show progress' '
 
 '
 
+test_expect_success 'clone does not segfault with --bare and core.bare=false' '
+	test_config_global core.bare false &&
+	git clone --bare parent clone-bare &&
+	echo true >expect &&
+	git -C clone-bare rev-parse --is-bare-repository >actual &&
+	test_cmp expect actual
+'
+
 test_expect_success 'chooses correct default initial branch name' '
-	git init --bare empty &&
-	git -c init.defaultBranch=up clone empty whats-up &&
-	test refs/heads/up = $(git -C whats-up symbolic-ref HEAD) &&
-	test refs/heads/up = $(git -C whats-up config branch.up.merge)
+	GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME= \
+	git -c init.defaultBranch=foo init --bare empty &&
+	test_config -C empty lsrefs.unborn advertise &&
+	GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME= \
+	git -c init.defaultBranch=up -c protocol.version=2 clone empty whats-up &&
+	test refs/heads/foo = $(git -C whats-up symbolic-ref HEAD) &&
+	test refs/heads/foo = $(git -C whats-up config branch.foo.merge)
 '
 
 test_expect_success 'guesses initial branch name correctly' '
@@ -51,9 +188,11 @@ test_expect_success 'guesses initial branch name correctly' '
 
 	git -c init.defaultBranch=none init --bare no-head &&
 	git -C initial-branch push ../no-head guess abc &&
+	GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME= \
 	git clone no-head is-it2 &&
 	test_must_fail git -C is-it2 symbolic-ref refs/remotes/origin/HEAD &&
 	git -C no-head update-ref --no-deref HEAD refs/heads/guess &&
+	GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME= \
 	git -c init.defaultBranch=guess clone no-head is-it3 &&
 	test refs/remotes/origin/guess = \
 		$(git -C is-it3 symbolic-ref refs/remotes/origin/HEAD)
diff --git a/t/t5607-clone-bundle.sh b/t/t5607-clone-bundle.sh
index 26985f4..0d1e92d 100755
--- a/t/t5607-clone-bundle.sh
+++ b/t/t5607-clone-bundle.sh
@@ -1,6 +1,9 @@
 #!/bin/sh
 
 test_description='some bundle related tests'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -19,18 +22,28 @@ test_expect_success 'setup' '
 '
 
 test_expect_success '"verify" needs a worktree' '
-	git bundle create tip.bundle -1 master &&
+	git bundle create tip.bundle -1 main &&
 	nongit test_must_fail git bundle verify ../tip.bundle 2>err &&
-	test_i18ngrep "need a repository" err
+	test_grep "need a repository" err
 '
 
 test_expect_success 'annotated tags can be excluded by rev-list options' '
 	git bundle create bundle --all --since=7.Apr.2005.15:14:00.-0700 &&
-	git ls-remote bundle > output &&
-	grep tag output &&
+	cat >expect <<-EOF &&
+	$(git rev-parse HEAD)	HEAD
+	$(git rev-parse tag)	refs/tags/tag
+	$(git rev-parse main)	refs/heads/main
+	EOF
+	git ls-remote bundle >actual &&
+	test_cmp expect actual &&
+
 	git bundle create bundle --all --since=7.Apr.2005.15:16:00.-0700 &&
-	git ls-remote bundle > output &&
-	! grep tag output
+	cat >expect <<-EOF &&
+	$(git rev-parse HEAD)	HEAD
+	$(git rev-parse main)	refs/heads/main
+	EOF
+	git ls-remote bundle >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success 'die if bundle file cannot be created' '
@@ -38,41 +51,68 @@ test_expect_success 'die if bundle file cannot be created' '
 	test_must_fail git bundle create adir --all
 '
 
-test_expect_failure 'bundle --stdin' '
-	echo master | git bundle create stdin-bundle.bdl --stdin &&
-	git ls-remote stdin-bundle.bdl >output &&
-	grep master output
+test_expect_success 'bundle --stdin' '
+	echo main | git bundle create stdin-bundle.bdl --stdin &&
+	cat >expect <<-EOF &&
+	$(git rev-parse main)	refs/heads/main
+	EOF
+	git ls-remote stdin-bundle.bdl >actual &&
+	test_cmp expect actual
 '
 
-test_expect_failure 'bundle --stdin <rev-list options>' '
-	echo master | git bundle create hybrid-bundle.bdl --stdin tag &&
-	git ls-remote hybrid-bundle.bdl >output &&
-	grep master output
+test_expect_success 'bundle --stdin <rev-list options>' '
+	echo main | git bundle create hybrid-bundle.bdl --stdin tag &&
+	cat >expect <<-EOF &&
+	$(git rev-parse main)	refs/heads/main
+	EOF
+	git ls-remote stdin-bundle.bdl >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success 'empty bundle file is rejected' '
-	: >empty-bundle &&
+	>empty-bundle &&
 	test_must_fail git fetch empty-bundle
 '
 
 # This triggers a bug in older versions where the resulting line (with
 # --pretty=oneline) was longer than a 1024-char buffer.
 test_expect_success 'ridiculously long subject in boundary' '
-	: >file4 &&
+	>file4 &&
 	test_tick &&
 	git add file4 &&
 	printf "%01200d\n" 0 | git commit -F - &&
 	test_commit fifth &&
 	git bundle create long-subject-bundle.bdl HEAD^..HEAD &&
-	git bundle list-heads long-subject-bundle.bdl >heads &&
-	test -s heads &&
+	cat >expect <<-EOF &&
+	$(git rev-parse main) HEAD
+	EOF
+	git bundle list-heads long-subject-bundle.bdl >actual &&
+	test_cmp expect actual &&
+
 	git fetch long-subject-bundle.bdl &&
-	sed -n "/^-/{p;q;}" long-subject-bundle.bdl >boundary &&
-	grep "^-$OID_REGEX " boundary
+
+	algo=$(test_oid algo) &&
+	if test "$algo" != sha1
+	then
+		echo "@object-format=sha256"
+	fi >expect &&
+	cat >>expect <<-EOF &&
+	-$(git log --pretty=format:"%H %s" -1 HEAD^)
+	$(git rev-parse HEAD) HEAD
+	EOF
+
+	if test "$algo" = sha1
+	then
+		head -n 3 long-subject-bundle.bdl
+	else
+		head -n 4 long-subject-bundle.bdl
+	fi | grep -v "^#" >actual &&
+
+	test_cmp expect actual
 '
 
 test_expect_success 'prerequisites with an empty commit message' '
-	: >file1 &&
+	>file1 &&
 	git add file1 &&
 	test_tick &&
 	git commit --allow-empty-message -m "" &&
@@ -83,14 +123,14 @@ test_expect_success 'prerequisites with an empty commit message' '
 
 test_expect_success 'failed bundle creation does not leave cruft' '
 	# This fails because the bundle would be empty.
-	test_must_fail git bundle create fail.bundle master..master &&
+	test_must_fail git bundle create fail.bundle main..main &&
 	test_path_is_missing fail.bundle.lock
 '
 
 test_expect_success 'fetch SHA-1 from bundle' '
 	test_create_repo foo &&
 	test_commit -C foo x &&
-	git -C foo bundle create tip.bundle -1 master &&
+	git -C foo bundle create tip.bundle -1 main &&
 	git -C foo rev-parse HEAD >hash &&
 
 	# Exercise to ensure that fetching a SHA-1 from a bundle works with no
@@ -100,7 +140,11 @@ test_expect_success 'fetch SHA-1 from bundle' '
 
 test_expect_success 'git bundle uses expected default format' '
 	git bundle create bundle HEAD^.. &&
-	head -n1 bundle | grep "^# v$(test_oid version) git bundle$"
+	cat >expect <<-EOF &&
+	# v$(test_oid version) git bundle
+	EOF
+	head -n1 bundle >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success 'git bundle v3 has expected contents' '
@@ -122,7 +166,7 @@ test_expect_success 'git bundle v3 rejects unknown capabilities' '
 	@unknown=silly
 	EOF
 	test_must_fail git bundle verify new 2>output &&
-	test_i18ngrep "unknown capability .unknown=silly." output
+	test_grep "unknown capability .unknown=silly." output
 '
 
 test_done
diff --git a/t/t5608-clone-2gb.sh b/t/t5608-clone-2gb.sh
index 4c476d2..87a8cd9 100755
--- a/t/t5608-clone-2gb.sh
+++ b/t/t5608-clone-2gb.sh
@@ -26,7 +26,7 @@ test_expect_success 'setup' '
 		i=$(($i+1)) ||
 		echo $? > exit-status
 	 done &&
-	 echo "commit refs/heads/master" &&
+	 echo "commit refs/heads/main" &&
 	 echo "author A U Thor <author@email.com> 123456789 +0000" &&
 	 echo "committer C O Mitter <committer@email.com> 123456789 +0000" &&
 	 echo "data 5" &&
diff --git a/t/t5609-clone-branch.sh b/t/t5609-clone-branch.sh
index 6e7a7be..252e1f7 100755
--- a/t/t5609-clone-branch.sh
+++ b/t/t5609-clone-branch.sh
@@ -1,6 +1,10 @@
 #!/bin/sh
 
 test_description='clone --branch option'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 check_HEAD() {
@@ -20,7 +24,7 @@ test_expect_success 'setup' '
 	 echo one >file && git add file && git commit -m one &&
 	 git checkout -b two &&
 	 echo two >file && git add file && git commit -m two &&
-	 git checkout master) &&
+	 git checkout main) &&
 	mkdir empty &&
 	(cd empty && git init)
 '
@@ -28,7 +32,7 @@ test_expect_success 'setup' '
 test_expect_success 'vanilla clone chooses HEAD' '
 	git clone parent clone &&
 	(cd clone &&
-	 check_HEAD master &&
+	 check_HEAD main &&
 	 check_file one
 	)
 '
@@ -53,7 +57,7 @@ test_expect_success 'clone -b sets up tracking' '
 
 test_expect_success 'clone -b does not munge remotes/origin/HEAD' '
 	(cd clone-two &&
-	 echo refs/remotes/origin/master >expect &&
+	 echo refs/remotes/origin/main >expect &&
 	 git symbolic-ref refs/remotes/origin/HEAD >actual &&
 	 test_cmp expect actual
 	)
diff --git a/t/t5610-clone-detached.sh b/t/t5610-clone-detached.sh
index 8b0d607..022ed3d 100755
--- a/t/t5610-clone-detached.sh
+++ b/t/t5610-clone-detached.sh
@@ -1,6 +1,10 @@
 #!/bin/sh
 
 test_description='test cloning a repository with detached HEAD'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 head_is_detached() {
@@ -20,7 +24,7 @@ test_expect_success 'setup' '
 '
 
 test_expect_success 'clone repo (detached HEAD points to branch)' '
-	git checkout master^0 &&
+	git checkout main^0 &&
 	git clone "file://$PWD" detached-branch
 '
 test_expect_success 'cloned HEAD matches' '
@@ -59,7 +63,7 @@ test_expect_success 'cloned HEAD is detached' '
 '
 
 test_expect_success 'clone repo (orphan detached HEAD)' '
-	git checkout master^0 &&
+	git checkout main^0 &&
 	echo four >file &&
 	git commit -a -m four &&
 	git clone "file://$PWD" detached-orphan
diff --git a/t/t5611-clone-config.sh b/t/t5611-clone-config.sh
index 8e0fd39..298d4be 100755
--- a/t/t5611-clone-config.sh
+++ b/t/t5611-clone-config.sh
@@ -1,6 +1,10 @@
 #!/bin/sh
 
 test_description='tests for git clone -c key=value'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'clone -c sets config in cloned repo' '
@@ -14,7 +18,7 @@ test_expect_success 'clone -c sets config in cloned repo' '
 test_expect_success 'clone -c can set multi-keys' '
 	rm -rf child &&
 	git clone -c core.foo=bar -c core.foo=baz . child &&
-	{ echo bar; echo baz; } >expect &&
+	test_write_lines bar baz >expect &&
 	git --git-dir=child/.git config --get-all core.foo >actual &&
 	test_cmp expect actual
 '
@@ -47,16 +51,16 @@ test_expect_success 'clone -c config is available during clone' '
 
 test_expect_success 'clone -c remote.origin.fetch=<refspec> works' '
 	rm -rf child &&
-	git update-ref refs/grab/it refs/heads/master &&
-	git update-ref refs/leave/out refs/heads/master &&
+	git update-ref refs/grab/it refs/heads/main &&
+	git update-ref refs/leave/out refs/heads/main &&
 	git clone -c "remote.origin.fetch=+refs/grab/*:refs/grab/*" . child &&
 	git -C child for-each-ref --format="%(refname)" >actual &&
 
 	cat >expect <<-\EOF &&
 	refs/grab/it
-	refs/heads/master
+	refs/heads/main
 	refs/remotes/origin/HEAD
-	refs/remotes/origin/master
+	refs/remotes/origin/main
 	EOF
 	test_cmp expect actual
 '
@@ -68,9 +72,9 @@ test_expect_success 'git -c remote.origin.fetch=<refspec> clone works' '
 
 	cat >expect <<-\EOF &&
 	refs/grab/it
-	refs/heads/master
+	refs/heads/main
 	refs/remotes/origin/HEAD
-	refs/remotes/origin/master
+	refs/remotes/origin/main
 	EOF
 	test_cmp expect actual
 '
@@ -85,13 +89,38 @@ test_expect_success 'clone -c remote.<remote>.fetch=<refspec> --origin=<name>' '
 
 	cat >expect <<-\EOF &&
 	refs/grab/it
-	refs/heads/master
+	refs/heads/main
 	refs/remotes/upstream/HEAD
-	refs/remotes/upstream/master
+	refs/remotes/upstream/main
 	EOF
 	test_cmp expect actual
 '
 
+test_expect_success 'set up shallow repository' '
+	git clone --depth=1 --no-local . shallow-repo
+'
+
+test_expect_success 'clone.rejectshallow=true should reject cloning shallow repo' '
+	test_when_finished "rm -rf out" &&
+	test_must_fail git -c clone.rejectshallow=true clone --no-local shallow-repo out 2>err &&
+	test_grep -e "source repository is shallow, reject to clone." err &&
+
+	git -c clone.rejectshallow=false clone --no-local shallow-repo out
+'
+
+test_expect_success 'option --[no-]reject-shallow override clone.rejectshallow config' '
+	test_when_finished "rm -rf out" &&
+	test_must_fail git -c clone.rejectshallow=false clone --reject-shallow --no-local shallow-repo out 2>err &&
+	test_grep -e "source repository is shallow, reject to clone." err &&
+
+	git -c clone.rejectshallow=true clone --no-reject-shallow --no-local shallow-repo out
+'
+
+test_expect_success 'clone.rejectshallow=true should succeed cloning normal repo' '
+	test_when_finished "rm -rf out" &&
+	git -c clone.rejectshallow=true clone --no-local . out
+'
+
 test_expect_success MINGW 'clone -c core.hideDotFiles' '
 	test_commit attributes .gitattributes "" &&
 	rm -rf child &&
diff --git a/t/t5612-clone-refspec.sh b/t/t5612-clone-refspec.sh
index e3b436d..3126cfd 100755
--- a/t/t5612-clone-refspec.sh
+++ b/t/t5612-clone-refspec.sh
@@ -1,10 +1,13 @@
 #!/bin/sh
 
 test_description='test refspec written by clone-command'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 test_expect_success 'setup' '
-	# Make two branches, "master" and "side"
+	# Make two branches, "main" and "side"
 	echo one >file &&
 	git add file &&
 	git commit -m one &&
@@ -16,7 +19,7 @@ test_expect_success 'setup' '
 	git checkout -b side &&
 	echo four >file &&
 	git commit -a -m four &&
-	git checkout master &&
+	git checkout main &&
 	git tag five &&
 
 	# default clone
@@ -25,18 +28,18 @@ test_expect_success 'setup' '
 	# default clone --no-tags
 	git clone --no-tags . dir_all_no_tags &&
 
-	# default --single that follows HEAD=master
-	git clone --single-branch . dir_master &&
+	# default --single that follows HEAD=main
+	git clone --single-branch . dir_main &&
 
-	# default --single that follows HEAD=master with no tags
-	git clone --single-branch --no-tags . dir_master_no_tags &&
+	# default --single that follows HEAD=main with no tags
+	git clone --single-branch --no-tags . dir_main_no_tags &&
 
 	# default --single that follows HEAD=side
 	git checkout side &&
 	git clone --single-branch . dir_side &&
 
 	# explicit --single that follows side
-	git checkout master &&
+	git checkout main &&
 	git clone --single-branch --branch side . dir_side2 &&
 
 	# default --single with --mirror
@@ -55,11 +58,11 @@ test_expect_success 'setup' '
 	# explicit --single with tag and --no-tags
 	git clone --single-branch --no-tags --branch two . dir_tag_no_tags &&
 
-	# advance both "master" and "side" branches
+	# advance both "main" and "side" branches
 	git checkout side &&
 	echo five >file &&
 	git commit -a -m five &&
-	git checkout master &&
+	git checkout main &&
 	echo six >file &&
 	git commit -a -m six &&
 
@@ -75,7 +78,7 @@ test_expect_success 'by default all branches will be kept updated' '
 		sed -e "/HEAD$/d" \
 		    -e "s|/remotes/origin/|/heads/|" refs >../actual
 	) &&
-	# follow both master and side
+	# follow both main and side
 	git for-each-ref refs/heads >expect &&
 	test_cmp expect actual
 '
@@ -94,26 +97,27 @@ test_expect_success 'by default no tags will be kept updated' '
 test_expect_success 'clone with --no-tags' '
 	(
 		cd dir_all_no_tags &&
+		grep tagOpt .git/config &&
 		git fetch &&
 		git for-each-ref refs/tags >../actual
 	) &&
 	test_must_be_empty actual
 '
 
-test_expect_success '--single-branch while HEAD pointing at master' '
+test_expect_success '--single-branch while HEAD pointing at main' '
 	(
-		cd dir_master &&
+		cd dir_main &&
 		git fetch --force &&
 		git for-each-ref refs/remotes/origin >refs &&
 		sed -e "/HEAD$/d" \
 		    -e "s|/remotes/origin/|/heads/|" refs >../actual
 	) &&
-	# only follow master
-	git for-each-ref refs/heads/master >expect &&
+	# only follow main
+	git for-each-ref refs/heads/main >expect &&
 	# get & check latest tags
 	test_cmp expect actual &&
 	(
-		cd dir_master &&
+		cd dir_main &&
 		git fetch --tags --force &&
 		git for-each-ref refs/tags >../actual
 	) &&
@@ -122,20 +126,20 @@ test_expect_success '--single-branch while HEAD pointing at master' '
 	test_line_count = 2 actual
 '
 
-test_expect_success '--single-branch while HEAD pointing at master and --no-tags' '
+test_expect_success '--single-branch while HEAD pointing at main and --no-tags' '
 	(
-		cd dir_master_no_tags &&
+		cd dir_main_no_tags &&
 		git fetch &&
 		git for-each-ref refs/remotes/origin >refs &&
 		sed -e "/HEAD$/d" \
 		    -e "s|/remotes/origin/|/heads/|" refs >../actual
 	) &&
-	# only follow master
-	git for-each-ref refs/heads/master >expect &&
+	# only follow main
+	git for-each-ref refs/heads/main >expect &&
 	test_cmp expect actual &&
 	# get tags (noop)
 	(
-		cd dir_master_no_tags &&
+		cd dir_main_no_tags &&
 		git fetch &&
 		git for-each-ref refs/tags >../actual
 	) &&
@@ -143,7 +147,7 @@ test_expect_success '--single-branch while HEAD pointing at master and --no-tags
 	test_line_count = 0 actual &&
 	# get tags with --tags overrides tagOpt
 	(
-		cd dir_master_no_tags &&
+		cd dir_main_no_tags &&
 		git fetch --tags &&
 		git for-each-ref refs/tags >../actual
 	) &&
diff --git a/t/t5613-info-alternate.sh b/t/t5613-info-alternate.sh
index 895f46b..7708cba 100755
--- a/t/t5613-info-alternate.sh
+++ b/t/t5613-info-alternate.sh
@@ -4,6 +4,8 @@
 #
 
 test_description='test transitive info/alternate entries'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'preparing first repository' '
diff --git a/t/t5614-clone-submodules-shallow.sh b/t/t5614-clone-submodules-shallow.sh
index e4e6ea4..c2a2bb4 100755
--- a/t/t5614-clone-submodules-shallow.sh
+++ b/t/t5614-clone-submodules-shallow.sh
@@ -2,12 +2,13 @@
 
 test_description='Test shallow cloning of repos with submodules'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 pwd=$(pwd)
 
 test_expect_success 'setup' '
-	git checkout -b master &&
+	git checkout -b main &&
 	test_commit commit1 &&
 	test_commit commit2 &&
 	mkdir sub &&
@@ -24,6 +25,7 @@ test_expect_success 'setup' '
 
 test_expect_success 'nonshallow clone implies nonshallow submodule' '
 	test_when_finished "rm -rf super_clone" &&
+	test_config_global protocol.file.allow always &&
 	git clone --recurse-submodules "file://$pwd/." super_clone &&
 	git -C super_clone log --oneline >lines &&
 	test_line_count = 3 lines &&
@@ -33,6 +35,7 @@ test_expect_success 'nonshallow clone implies nonshallow submodule' '
 
 test_expect_success 'shallow clone with shallow submodule' '
 	test_when_finished "rm -rf super_clone" &&
+	test_config_global protocol.file.allow always &&
 	git clone --recurse-submodules --depth 2 --shallow-submodules "file://$pwd/." super_clone &&
 	git -C super_clone log --oneline >lines &&
 	test_line_count = 2 lines &&
@@ -42,6 +45,7 @@ test_expect_success 'shallow clone with shallow submodule' '
 
 test_expect_success 'shallow clone does not imply shallow submodule' '
 	test_when_finished "rm -rf super_clone" &&
+	test_config_global protocol.file.allow always &&
 	git clone --recurse-submodules --depth 2 "file://$pwd/." super_clone &&
 	git -C super_clone log --oneline >lines &&
 	test_line_count = 2 lines &&
@@ -51,6 +55,7 @@ test_expect_success 'shallow clone does not imply shallow submodule' '
 
 test_expect_success 'shallow clone with non shallow submodule' '
 	test_when_finished "rm -rf super_clone" &&
+	test_config_global protocol.file.allow always &&
 	git clone --recurse-submodules --depth 2 --no-shallow-submodules "file://$pwd/." super_clone &&
 	git -C super_clone log --oneline >lines &&
 	test_line_count = 2 lines &&
@@ -60,6 +65,7 @@ test_expect_success 'shallow clone with non shallow submodule' '
 
 test_expect_success 'non shallow clone with shallow submodule' '
 	test_when_finished "rm -rf super_clone" &&
+	test_config_global protocol.file.allow always &&
 	git clone --recurse-submodules --no-local --shallow-submodules "file://$pwd/." super_clone &&
 	git -C super_clone log --oneline >lines &&
 	test_line_count = 3 lines &&
@@ -69,6 +75,7 @@ test_expect_success 'non shallow clone with shallow submodule' '
 
 test_expect_success 'clone follows shallow recommendation' '
 	test_when_finished "rm -rf super_clone" &&
+	test_config_global protocol.file.allow always &&
 	git config -f .gitmodules submodule.sub.shallow true &&
 	git add .gitmodules &&
 	git commit -m "recommend shallow for sub" &&
@@ -87,6 +94,7 @@ test_expect_success 'clone follows shallow recommendation' '
 
 test_expect_success 'get unshallow recommended shallow submodule' '
 	test_when_finished "rm -rf super_clone" &&
+	test_config_global protocol.file.allow always &&
 	git clone --no-local "file://$pwd/." super_clone &&
 	(
 		cd super_clone &&
@@ -103,6 +111,7 @@ test_expect_success 'get unshallow recommended shallow submodule' '
 
 test_expect_success 'clone follows non shallow recommendation' '
 	test_when_finished "rm -rf super_clone" &&
+	test_config_global protocol.file.allow always &&
 	git config -f .gitmodules submodule.sub.shallow false &&
 	git add .gitmodules &&
 	git commit -m "recommend non shallow for sub" &&
diff --git a/t/t5615-alternate-env.sh b/t/t5615-alternate-env.sh
index b4905b8..83513e4 100755
--- a/t/t5615-alternate-env.sh
+++ b/t/t5615-alternate-env.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='handling of alternates in environment variables'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 check_obj () {
diff --git a/t/t5616-partial-clone.sh b/t/t5616-partial-clone.sh
index 8827c2e..2da7291 100755
--- a/t/t5616-partial-clone.sh
+++ b/t/t5616-partial-clone.sh
@@ -2,6 +2,9 @@
 
 test_description='git partial clone'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 # create a normal "src" repo where we can later create new commits.
@@ -13,10 +16,10 @@ test_expect_success 'setup normal src repo' '
 	git init src &&
 	for n in 1 2 3 4
 	do
-		echo "This is file: $n" > src/file.$n.txt
-		git -C src add file.$n.txt
-		git -C src commit -m "file $n"
-		git -C src ls-files -s file.$n.txt >>temp
+		echo "This is file: $n" > src/file.$n.txt &&
+		git -C src add file.$n.txt &&
+		git -C src commit -m "file $n" &&
+		git -C src ls-files -s file.$n.txt >>temp || return 1
 	done &&
 	awk -f print_2.awk <temp | sort >expect_1.oids &&
 	test_line_count = 4 expect_1.oids
@@ -46,19 +49,26 @@ test_expect_success 'do partial clone 1' '
 	test "$(git -C pc1 config --local remote.origin.partialclonefilter)" = "blob:none"
 '
 
+test_expect_success 'rev-list --missing=allow-promisor on partial clone' '
+	git -C pc1 rev-list --objects --missing=allow-promisor HEAD >actual &&
+	git -C pc1 rev-list --objects --missing=print HEAD >expect.raw &&
+	grep -v "^?" expect.raw >expect &&
+	test_cmp expect actual
+'
+
 test_expect_success 'verify that .promisor file contains refs fetched' '
 	ls pc1/.git/objects/pack/pack-*.promisor >promisorlist &&
 	test_line_count = 1 promisorlist &&
 	git -C srv.bare rev-parse --verify HEAD >headhash &&
 	grep "$(cat headhash) HEAD" $(cat promisorlist) &&
-	grep "$(cat headhash) refs/heads/master" $(cat promisorlist)
+	grep "$(cat headhash) refs/heads/main" $(cat promisorlist)
 '
 
-# checkout master to force dynamic object fetch of blobs at HEAD.
+# checkout main to force dynamic object fetch of blobs at HEAD.
 test_expect_success 'verify checkout with dynamic object fetch' '
 	git -C pc1 rev-list --quiet --objects --missing=print HEAD >observed &&
 	test_line_count = 4 observed &&
-	git -C pc1 checkout master &&
+	git -C pc1 checkout main &&
 	git -C pc1 rev-list --quiet --objects --missing=print HEAD >observed &&
 	test_line_count = 0 observed
 '
@@ -69,12 +79,12 @@ test_expect_success 'push new commits to server' '
 	git -C src remote add srv "file://$(pwd)/srv.bare" &&
 	for x in a b c d e
 	do
-		echo "Mod file.1.txt $x" >>src/file.1.txt
-		git -C src add file.1.txt
-		git -C src commit -m "mod $x"
+		echo "Mod file.1.txt $x" >>src/file.1.txt &&
+		git -C src add file.1.txt &&
+		git -C src commit -m "mod $x" || return 1
 	done &&
-	git -C src blame master -- file.1.txt >expect.blame &&
-	git -C src push -u srv master
+	git -C src blame main -- file.1.txt >expect.blame &&
+	git -C src push -u srv main
 '
 
 # (partial) fetch in the partial clone repo from the promisor remote.
@@ -83,26 +93,26 @@ test_expect_success 'push new commits to server' '
 test_expect_success 'partial fetch inherits filter settings' '
 	git -C pc1 fetch origin &&
 	git -C pc1 rev-list --quiet --objects --missing=print \
-		master..origin/master >observed &&
+		main..origin/main >observed &&
 	test_line_count = 5 observed
 '
 
 # force dynamic object fetch using diff.
-# we should only get 1 new blob (for the file in origin/master).
+# we should only get 1 new blob (for the file in origin/main).
 test_expect_success 'verify diff causes dynamic object fetch' '
-	git -C pc1 diff master..origin/master -- file.1.txt &&
+	git -C pc1 diff main..origin/main -- file.1.txt &&
 	git -C pc1 rev-list --quiet --objects --missing=print \
-		 master..origin/master >observed &&
+		 main..origin/main >observed &&
 	test_line_count = 4 observed
 '
 
 # force full dynamic object fetch of the file's history using blame.
 # we should get the intermediate blobs for the file.
 test_expect_success 'verify blame causes dynamic object fetch' '
-	git -C pc1 blame origin/master -- file.1.txt >observed.blame &&
+	git -C pc1 blame origin/main -- file.1.txt >observed.blame &&
 	test_cmp expect.blame observed.blame &&
 	git -C pc1 rev-list --quiet --objects --missing=print \
-		master..origin/master >observed &&
+		main..origin/main >observed &&
 	test_line_count = 0 observed
 '
 
@@ -111,11 +121,11 @@ test_expect_success 'verify blame causes dynamic object fetch' '
 test_expect_success 'push new commits to server for file.2.txt' '
 	for x in a b c d e f
 	do
-		echo "Mod file.2.txt $x" >>src/file.2.txt
-		git -C src add file.2.txt
-		git -C src commit -m "mod $x"
+		echo "Mod file.2.txt $x" >>src/file.2.txt &&
+		git -C src add file.2.txt &&
+		git -C src commit -m "mod $x" || return 1
 	done &&
-	git -C src push -u srv master
+	git -C src push -u srv main
 '
 
 # Do FULL fetch by disabling inherited filter-spec using --no-filter.
@@ -123,7 +133,7 @@ test_expect_success 'push new commits to server for file.2.txt' '
 test_expect_success 'override inherited filter-spec using --no-filter' '
 	git -C pc1 fetch --no-filter origin &&
 	git -C pc1 rev-list --quiet --objects --missing=print \
-		master..origin/master >observed &&
+		main..origin/main >observed &&
 	test_line_count = 0 observed
 '
 
@@ -132,11 +142,11 @@ test_expect_success 'override inherited filter-spec using --no-filter' '
 test_expect_success 'push new commits to server for file.3.txt' '
 	for x in a b c d e f
 	do
-		echo "Mod file.3.txt $x" >>src/file.3.txt
-		git -C src add file.3.txt
-		git -C src commit -m "mod $x"
+		echo "Mod file.3.txt $x" >>src/file.3.txt &&
+		git -C src add file.3.txt &&
+		git -C src commit -m "mod $x" || return 1
 	done &&
-	git -C src push -u srv master
+	git -C src push -u srv main
 '
 
 # Do a partial fetch and then try to manually fetch the missing objects.
@@ -146,7 +156,7 @@ test_expect_success 'manual prefetch of missing objects' '
 	git -C pc1 fetch --filter=blob:none origin &&
 
 	git -C pc1 rev-list --quiet --objects --missing=print \
-		 master..origin/master >revs &&
+		 main..origin/main >revs &&
 	awk -f print_1.awk revs |
 	sed "s/?//" |
 	sort >observed.oids &&
@@ -155,7 +165,7 @@ test_expect_success 'manual prefetch of missing objects' '
 	git -C pc1 fetch-pack --stdin "file://$(pwd)/srv.bare" <observed.oids &&
 
 	git -C pc1 rev-list --quiet --objects --missing=print \
-		master..origin/master >revs &&
+		main..origin/main >revs &&
 	awk -f print_1.awk revs |
 	sed "s/?//" |
 	sort >observed.oids &&
@@ -163,6 +173,109 @@ test_expect_success 'manual prefetch of missing objects' '
 	test_line_count = 0 observed.oids
 '
 
+# create new commits in "src" repo to establish a history on file.4.txt
+# and push to "srv.bare".
+test_expect_success 'push new commits to server for file.4.txt' '
+	for x in a b c d e f
+	do
+		echo "Mod file.4.txt $x" >src/file.4.txt &&
+		if list_contains "a,b" "$x"; then
+			printf "%10000s" X >>src/file.4.txt
+		fi &&
+		if list_contains "c,d" "$x"; then
+			printf "%20000s" X >>src/file.4.txt
+		fi &&
+		git -C src add file.4.txt &&
+		git -C src commit -m "mod $x" || return 1
+	done &&
+	git -C src push -u srv main
+'
+
+# Do partial fetch to fetch smaller files; then verify that without --refetch
+# applying a new filter does not refetch missing large objects. Then use
+# --refetch to apply the new filter on existing commits. Test it under both
+# protocol v2 & v0.
+test_expect_success 'apply a different filter using --refetch' '
+	git -C pc1 fetch --filter=blob:limit=999 origin &&
+	git -C pc1 rev-list --quiet --objects --missing=print \
+		main..origin/main >observed &&
+	test_line_count = 4 observed &&
+
+	git -C pc1 fetch --filter=blob:limit=19999 --refetch origin &&
+	git -C pc1 rev-list --quiet --objects --missing=print \
+		main..origin/main >observed &&
+	test_line_count = 2 observed &&
+
+	git -c protocol.version=0 -C pc1 fetch --filter=blob:limit=29999 \
+		--refetch origin &&
+	git -C pc1 rev-list --quiet --objects --missing=print \
+		main..origin/main >observed &&
+	test_line_count = 0 observed
+'
+
+test_expect_success 'fetch --refetch works with a shallow clone' '
+	git clone --no-checkout --depth=1 --filter=blob:none "file://$(pwd)/srv.bare" pc1s &&
+	git -C pc1s rev-list --objects --missing=print HEAD >observed &&
+	test_line_count = 6 observed &&
+
+	GIT_TRACE=1 git -C pc1s fetch --filter=blob:limit=999 --refetch origin &&
+	git -C pc1s rev-list --objects --missing=print HEAD >observed &&
+	test_line_count = 6 observed
+'
+
+test_expect_success 'fetch --refetch triggers repacking' '
+	GIT_TRACE2_CONFIG_PARAMS=gc.autoPackLimit,maintenance.incremental-repack.auto &&
+	export GIT_TRACE2_CONFIG_PARAMS &&
+
+	GIT_TRACE2_EVENT="$PWD/trace1.event" \
+	git -C pc1 fetch --refetch origin &&
+	test_subcommand git maintenance run --auto --no-quiet <trace1.event &&
+	grep \"param\":\"gc.autopacklimit\",\"value\":\"1\" trace1.event &&
+	grep \"param\":\"maintenance.incremental-repack.auto\",\"value\":\"-1\" trace1.event &&
+
+	GIT_TRACE2_EVENT="$PWD/trace2.event" \
+	git -c protocol.version=0 \
+		-c gc.autoPackLimit=0 \
+		-c maintenance.incremental-repack.auto=1234 \
+		-C pc1 fetch --refetch origin &&
+	test_subcommand git maintenance run --auto --no-quiet <trace2.event &&
+	grep \"param\":\"gc.autopacklimit\",\"value\":\"0\" trace2.event &&
+	grep \"param\":\"maintenance.incremental-repack.auto\",\"value\":\"-1\" trace2.event &&
+
+	GIT_TRACE2_EVENT="$PWD/trace3.event" \
+	git -c protocol.version=0 \
+		-c gc.autoPackLimit=1234 \
+		-c maintenance.incremental-repack.auto=0 \
+		-C pc1 fetch --refetch origin &&
+	test_subcommand git maintenance run --auto --no-quiet <trace3.event &&
+	grep \"param\":\"gc.autopacklimit\",\"value\":\"1\" trace3.event &&
+	grep \"param\":\"maintenance.incremental-repack.auto\",\"value\":\"0\" trace3.event
+'
+
+test_expect_success 'partial clone with transfer.fsckobjects=1 works with submodules' '
+	test_create_repo submodule &&
+	test_commit -C submodule mycommit &&
+
+	test_create_repo src_with_sub &&
+	git -C src_with_sub config uploadpack.allowfilter 1 &&
+	git -C src_with_sub config uploadpack.allowanysha1inwant 1 &&
+
+	test_config_global protocol.file.allow always &&
+
+	git -C src_with_sub submodule add "file://$(pwd)/submodule" mysub &&
+	git -C src_with_sub commit -m "commit with submodule" &&
+
+	git -c transfer.fsckobjects=1 \
+		clone --filter="blob:none" "file://$(pwd)/src_with_sub" dst &&
+	test_when_finished rm -rf dst
+'
+
+test_expect_success 'lazily fetched .gitmodules works' '
+	git clone --filter="blob:none" --no-checkout "file://$(pwd)/src_with_sub" dst &&
+	git -C dst fetch &&
+	test_when_finished rm -rf dst
+'
+
 test_expect_success 'partial clone with transfer.fsckobjects=1 uses index-pack --fsck-objects' '
 	git init src &&
 	test_commit -C src x &&
@@ -180,7 +293,7 @@ test_expect_success 'use fsck before and after manually fetching a missing subtr
 	echo "in dir" >src/dir/file.txt &&
 	git -C src add dir/file.txt &&
 	git -C src commit -m "file in dir" &&
-	git -C src push -u srv master &&
+	git -C src push -u srv main &&
 	SUBTREE=$(git -C src rev-parse HEAD:dir) &&
 
 	rm -rf dst &&
@@ -188,7 +301,7 @@ test_expect_success 'use fsck before and after manually fetching a missing subtr
 	git -C dst fsck &&
 
 	# Make sure we only have commits, and all trees and blobs are missing.
-	git -C dst rev-list --missing=allow-any --objects master \
+	git -C dst rev-list --missing=allow-any --objects main \
 		>fetched_objects &&
 	awk -f print_1.awk fetched_objects |
 	xargs -n1 git -C dst cat-file -t >fetched_types &&
@@ -205,8 +318,8 @@ test_expect_success 'use fsck before and after manually fetching a missing subtr
 	git -C dst fsck &&
 
 	# Auto-fetch all remaining trees and blobs with --missing=error
-	git -C dst rev-list --missing=error --objects master >fetched_objects &&
-	test_line_count = 70 fetched_objects &&
+	git -C dst rev-list --missing=error --objects main >fetched_objects &&
+	test_line_count = 88 fetched_objects &&
 
 	awk -f print_1.awk fetched_objects |
 	xargs -n1 git -C dst cat-file -t >fetched_types &&
@@ -235,11 +348,19 @@ test_expect_success 'implicitly construct combine: filter with repeated flags' '
 	test_cmp unique_types.expected unique_types.actual
 '
 
+test_expect_success 'upload-pack complains of bogus filter config' '
+	printf 0000 |
+	test_must_fail git \
+		-c uploadpackfilter.tree.maxdepth \
+		upload-pack . >/dev/null 2>err &&
+	test_grep "unable to parse.*tree.maxdepth" err
+'
+
 test_expect_success 'upload-pack fails banned object filters' '
 	test_config -C srv.bare uploadpackfilter.blob:none.allow false &&
 	test_must_fail ok=sigpipe git clone --no-checkout --filter=blob:none \
 		"file://$(pwd)/srv.bare" pc3 2>err &&
-	test_i18ngrep "filter '\''blob:none'\'' not supported" err
+	test_grep "filter '\''blob:none'\'' not supported" err
 '
 
 test_expect_success 'upload-pack fails banned combine object filters' '
@@ -249,14 +370,14 @@ test_expect_success 'upload-pack fails banned combine object filters' '
 	test_config -C srv.bare uploadpackfilter.blob:none.allow false &&
 	test_must_fail ok=sigpipe git clone --no-checkout --filter=tree:1 \
 		--filter=blob:none "file://$(pwd)/srv.bare" pc3 2>err &&
-	test_i18ngrep "filter '\''blob:none'\'' not supported" err
+	test_grep "filter '\''blob:none'\'' not supported" err
 '
 
 test_expect_success 'upload-pack fails banned object filters with fallback' '
 	test_config -C srv.bare uploadpackfilter.allow false &&
 	test_must_fail ok=sigpipe git clone --no-checkout --filter=blob:none \
 		"file://$(pwd)/srv.bare" pc3 2>err &&
-	test_i18ngrep "filter '\''blob:none'\'' not supported" err
+	test_grep "filter '\''blob:none'\'' not supported" err
 '
 
 test_expect_success 'upload-pack limits tree depth filters' '
@@ -265,7 +386,15 @@ test_expect_success 'upload-pack limits tree depth filters' '
 	test_config -C srv.bare uploadpackfilter.tree.maxDepth 0 &&
 	test_must_fail ok=sigpipe git clone --no-checkout --filter=tree:1 \
 		"file://$(pwd)/srv.bare" pc3 2>err &&
-	test_i18ngrep "tree filter allows max depth 0, but got 1" err
+	test_grep "tree filter allows max depth 0, but got 1" err &&
+
+	git clone --no-checkout --filter=tree:0 "file://$(pwd)/srv.bare" pc4 &&
+
+	test_config -C srv.bare uploadpackfilter.tree.maxDepth 5 &&
+	git clone --no-checkout --filter=tree:5 "file://$(pwd)/srv.bare" pc5 &&
+	test_must_fail ok=sigpipe git clone --no-checkout --filter=tree:6 \
+		"file://$(pwd)/srv.bare" pc6 2>err &&
+	test_grep "tree filter allows max depth 5, but got 6" err
 '
 
 test_expect_success 'partial clone fetches blobs pointed to by refs even if normally filtered out' '
@@ -315,7 +444,7 @@ test_expect_success 'setup src repo for sparse filter' '
 test_expect_success 'partial clone with sparse filter succeeds' '
 	rm -rf dst.git &&
 	git clone --no-local --bare \
-		  --filter=sparse:oid=master:only-one \
+		  --filter=sparse:oid=main:only-one \
 		  sparse-src dst.git &&
 	(
 		cd dst.git &&
@@ -328,13 +457,13 @@ test_expect_success 'partial clone with sparse filter succeeds' '
 test_expect_success 'partial clone with unresolvable sparse filter fails cleanly' '
 	rm -rf dst.git &&
 	test_must_fail git clone --no-local --bare \
-				 --filter=sparse:oid=master:no-such-name \
+				 --filter=sparse:oid=main:no-such-name \
 				 sparse-src dst.git 2>err &&
-	test_i18ngrep "unable to access sparse blob in .master:no-such-name" err &&
+	test_grep "unable to access sparse blob in .main:no-such-name" err &&
 	test_must_fail git clone --no-local --bare \
-				 --filter=sparse:oid=master \
+				 --filter=sparse:oid=main \
 				 sparse-src dst.git 2>err &&
-	test_i18ngrep "unable to parse sparse filter data in" err
+	test_grep "unable to parse sparse filter data in" err
 '
 
 setup_triangle () {
@@ -350,7 +479,7 @@ setup_triangle () {
 	for i in $(test_seq 1 100)
 	do
 		echo "make the tree big" >server/file$i &&
-		git -C server add file$i
+		git -C server add file$i || return 1
 	done &&
 	git -C server commit -m "initial" &&
 	git clone --bare --filter=tree:0 "file://$(pwd)/server" client &&
@@ -364,8 +493,8 @@ setup_triangle () {
 	TREE_HASH=$(git -C server rev-parse HEAD~1^{tree}) &&
 	git -C promisor-remote fetch --keep "file://$(pwd)/server" "$TREE_HASH" &&
 	git -C promisor-remote count-objects -v >object-count &&
-	test_i18ngrep "count: 0" object-count &&
-	test_i18ngrep "in-pack: 2" object-count &&
+	test_grep "count: 0" object-count &&
+	test_grep "in-pack: 2" object-count &&
 
 	# Set it as the promisor remote of client. Thus, whenever
 	# the client lazy fetches, the lazy fetch will succeed only if it is
@@ -387,7 +516,7 @@ test_expect_success 'fetch lazy-fetches only to resolve deltas' '
 	# promisor remote other than for the big tree (because it needs to
 	# resolve the delta).
 	GIT_TRACE_PACKET="$(pwd)/trace" git -C client \
-		fetch "file://$(pwd)/server" master &&
+		fetch "file://$(pwd)/server" main &&
 
 	# Verify the assumption that the client needed to fetch the delta base
 	# to resolve the delta.
@@ -406,7 +535,7 @@ test_expect_success 'fetch lazy-fetches only to resolve deltas, protocol v2' '
 	# promisor remote other than for the big blob (because it needs to
 	# resolve the delta).
 	GIT_TRACE_PACKET="$(pwd)/trace" git -C client \
-		fetch "file://$(pwd)/server" master &&
+		fetch "file://$(pwd)/server" main &&
 
 	# Verify that protocol version 2 was used.
 	grep "fetch< version 2" trace &&
@@ -417,6 +546,26 @@ test_expect_success 'fetch lazy-fetches only to resolve deltas, protocol v2' '
 	grep "want $(cat hash)" trace
 '
 
+test_expect_success 'fetch does not lazy-fetch missing targets of its refs' '
+	rm -rf server client trace &&
+
+	test_create_repo server &&
+	test_config -C server uploadpack.allowfilter 1 &&
+	test_config -C server uploadpack.allowanysha1inwant 1 &&
+	test_commit -C server foo &&
+
+	git clone --filter=blob:none "file://$(pwd)/server" client &&
+	# Make all refs point to nothing by deleting all objects.
+	rm client/.git/objects/pack/* &&
+
+	test_commit -C server bar &&
+	GIT_TRACE_PACKET="$(pwd)/trace" git -C client fetch \
+		--no-tags --recurse-submodules=no \
+		origin refs/tags/bar &&
+	FOO_HASH=$(git -C server rev-parse foo) &&
+	! grep "want $FOO_HASH" trace
+'
+
 # The following two tests must be in this order. It is important that
 # the srv.bare repository did not have tags during clone, but has tags
 # in the fetch.
@@ -493,6 +642,57 @@ test_expect_success 'fetch from a partial clone, protocol v2' '
 	grep "version 2" trace
 '
 
+test_expect_success 'repack does not loosen promisor objects' '
+	rm -rf client trace &&
+	git clone --bare --filter=blob:none "file://$(pwd)/srv.bare" client &&
+	test_when_finished "rm -rf client trace" &&
+	GIT_TRACE2_PERF="$(pwd)/trace" git -C client repack -A -d &&
+	grep "loosen_unused_packed_objects/loosened:0" trace
+'
+
+test_expect_success 'lazy-fetch in submodule succeeds' '
+	# setup
+	test_config_global protocol.file.allow always &&
+
+	test_when_finished "rm -rf src-sub" &&
+	git init src-sub &&
+	git -C src-sub config uploadpack.allowfilter 1 &&
+	git -C src-sub config uploadpack.allowanysha1inwant 1 &&
+
+	# This blob must be missing in the subsequent commit.
+	echo foo >src-sub/file &&
+	git -C src-sub add file &&
+	git -C src-sub commit -m "submodule one" &&
+	SUB_ONE=$(git -C src-sub rev-parse HEAD) &&
+
+	echo bar >src-sub/file &&
+	git -C src-sub add file &&
+	git -C src-sub commit -m "submodule two" &&
+	SUB_TWO=$(git -C src-sub rev-parse HEAD) &&
+
+	test_when_finished "rm -rf src-super" &&
+	git init src-super &&
+	git -C src-super config uploadpack.allowfilter 1 &&
+	git -C src-super config uploadpack.allowanysha1inwant 1 &&
+	git -C src-super submodule add ../src-sub src-sub &&
+
+	git -C src-super/src-sub checkout $SUB_ONE &&
+	git -C src-super add src-sub &&
+	git -C src-super commit -m "superproject one" &&
+
+	git -C src-super/src-sub checkout $SUB_TWO &&
+	git -C src-super add src-sub &&
+	git -C src-super commit -m "superproject two" &&
+
+	# the fetch
+	test_when_finished "rm -rf client" &&
+	git clone --filter=blob:none --also-filter-submodules \
+		--recurse-submodules "file://$(pwd)/src-super" client &&
+
+	# Trigger lazy-fetch from the superproject
+	git -C client restore --recurse-submodules --source=HEAD^ :/
+'
+
 . "$TEST_DIRECTORY"/lib-httpd.sh
 start_httpd
 
@@ -548,7 +748,7 @@ test_expect_success 'upon cloning, check that all refs point to objects' '
 	test_must_fail git -c protocol.version=2 clone \
 		--filter=blob:none $HTTPD_URL/one_time_perl/server repo 2>err &&
 
-	test_i18ngrep "did not send all necessary objects" err &&
+	test_grep "did not send all necessary objects" err &&
 
 	# Ensure that the one-time-perl script was used.
 	! test -e "$HTTPD_ROOT_PATH/one-time-perl"
@@ -606,7 +806,7 @@ test_expect_success 'tolerate server sending REF_DELTA against missing promisor
 	for i in $(test_seq 10)
 	do
 		echo "this is a line" >>"$SERVER/foo.txt" &&
-		echo "this is another line" >>"$SERVER/have.txt"
+		echo "this is another line" >>"$SERVER/have.txt" || return 1
 	done &&
 	git -C "$SERVER" add foo.txt have.txt &&
 	git -C "$SERVER" commit -m bar &&
diff --git a/t/t5617-clone-submodules-remote.sh b/t/t5617-clone-submodules-remote.sh
index 1a041df..5a4d793 100755
--- a/t/t5617-clone-submodules-remote.sh
+++ b/t/t5617-clone-submodules-remote.sh
@@ -2,12 +2,17 @@
 
 test_description='Test cloning repos with submodules using remote-tracking branches'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 pwd=$(pwd)
 
 test_expect_success 'setup' '
-	git checkout -b master &&
+	git config --global protocol.file.allow always &&
+	git checkout -b main &&
 	test_commit commit1 &&
 	mkdir sub &&
 	(
@@ -25,6 +30,13 @@ test_expect_success 'setup' '
 	)
 '
 
+# bare clone giving "srv.bare" for use as our server.
+test_expect_success 'setup bare clone for server' '
+	git clone --bare "file://$(pwd)/." srv.bare &&
+	git -C srv.bare config --local uploadpack.allowfilter 1 &&
+	git -C srv.bare config --local uploadpack.allowanysha1inwant 1
+'
+
 test_expect_success 'clone with --no-remote-submodules' '
 	test_when_finished "rm -rf super_clone" &&
 	git clone --recurse-submodules --no-remote-submodules "file://$pwd/." super_clone &&
@@ -39,7 +51,7 @@ test_expect_success 'clone with --remote-submodules' '
 	git clone --recurse-submodules --remote-submodules "file://$pwd/." super_clone &&
 	(
 		cd super_clone/sub &&
-		git diff --exit-code remotes/origin/master
+		git diff --exit-code remotes/origin/main
 	)
 '
 
@@ -57,9 +69,43 @@ test_expect_success 'clone with --single-branch' '
 	git clone --recurse-submodules --single-branch "file://$pwd/." super_clone &&
 	(
 		cd super_clone/sub &&
-		git rev-parse --verify origin/master &&
+		git rev-parse --verify origin/main &&
 		test_must_fail git rev-parse --verify origin/other
 	)
 '
 
+# do basic partial clone from "srv.bare"
+# confirm partial clone was registered in the local config for super and sub.
+test_expect_success 'clone with --filter' '
+	git clone --recurse-submodules \
+		--filter blob:none --also-filter-submodules \
+		"file://$pwd/srv.bare" super_clone &&
+	test_cmp_config -C super_clone true remote.origin.promisor &&
+	test_cmp_config -C super_clone blob:none remote.origin.partialclonefilter &&
+	test_cmp_config -C super_clone/sub true remote.origin.promisor &&
+	test_cmp_config -C super_clone/sub blob:none remote.origin.partialclonefilter
+'
+
+# check that clone.filterSubmodules works (--also-filter-submodules can be
+# omitted)
+test_expect_success 'filters applied with clone.filterSubmodules' '
+	test_config_global clone.filterSubmodules true &&
+	git clone --recurse-submodules --filter blob:none \
+		"file://$pwd/srv.bare" super_clone2 &&
+	test_cmp_config -C super_clone2 true remote.origin.promisor &&
+	test_cmp_config -C super_clone2 blob:none remote.origin.partialclonefilter &&
+	test_cmp_config -C super_clone2/sub true remote.origin.promisor &&
+	test_cmp_config -C super_clone2/sub blob:none remote.origin.partialclonefilter
+'
+
+test_expect_success '--no-also-filter-submodules overrides clone.filterSubmodules=true' '
+	test_config_global clone.filterSubmodules true &&
+	git clone --recurse-submodules --filter blob:none \
+		--no-also-filter-submodules \
+		"file://$pwd/srv.bare" super_clone3 &&
+	test_cmp_config -C super_clone3 true remote.origin.promisor &&
+	test_cmp_config -C super_clone3 blob:none remote.origin.partialclonefilter &&
+	test_cmp_config -C super_clone3/sub false --default false remote.origin.promisor
+'
+
 test_done
diff --git a/t/t5618-alternate-refs.sh b/t/t5618-alternate-refs.sh
index 3353216..f905db0 100755
--- a/t/t5618-alternate-refs.sh
+++ b/t/t5618-alternate-refs.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='test handling of --alternate-refs traversal'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # Avoid test_commit because we want a specific and known set of refs:
diff --git a/t/t5619-clone-local-ambiguous-transport.sh b/t/t5619-clone-local-ambiguous-transport.sh
new file mode 100755
index 0000000..cce62bf
--- /dev/null
+++ b/t/t5619-clone-local-ambiguous-transport.sh
@@ -0,0 +1,70 @@
+#!/bin/sh
+
+test_description='test local clone with ambiguous transport'
+
+. ./test-lib.sh
+. "$TEST_DIRECTORY/lib-httpd.sh"
+
+if ! test_have_prereq SYMLINKS
+then
+	skip_all='skipping test, symlink support unavailable'
+	test_done
+fi
+
+start_httpd
+
+REPO="$HTTPD_DOCUMENT_ROOT_PATH/sub.git"
+URI="$HTTPD_URL/dumb/sub.git"
+
+test_expect_success 'setup' '
+	mkdir -p sensitive &&
+	echo "secret" >sensitive/secret &&
+
+	git init --bare "$REPO" &&
+	test_commit_bulk -C "$REPO" --ref=main 1 &&
+
+	git -C "$REPO" update-ref HEAD main &&
+	git -C "$REPO" update-server-info &&
+
+	git init malicious &&
+	(
+		cd malicious &&
+
+		git submodule add "$URI" &&
+
+		mkdir -p repo/refs &&
+		touch repo/refs/.gitkeep &&
+		printf "ref: refs/heads/a" >repo/HEAD &&
+		ln -s "$(cd .. && pwd)/sensitive" repo/objects &&
+
+		mkdir -p "$HTTPD_URL/dumb" &&
+		ln -s "../../../.git/modules/sub/../../../repo/" "$URI" &&
+
+		git add . &&
+		git commit -m "initial commit"
+	) &&
+
+	# Delete all of the references in our malicious submodule to
+	# avoid the client attempting to checkout any objects (which
+	# will be missing, and thus will cause the clone to fail before
+	# we can trigger the exploit).
+	git -C "$REPO" for-each-ref --format="delete %(refname)" >in &&
+	git -C "$REPO" update-ref --stdin <in &&
+	git -C "$REPO" update-server-info
+'
+
+test_expect_success 'ambiguous transport does not lead to arbitrary file-inclusion' '
+	git clone malicious clone &&
+	test_must_fail git -C clone submodule update --init 2>err &&
+
+	test_path_is_missing clone/.git/modules/sub/objects/secret &&
+	# We would actually expect "transport .file. not allowed" here,
+	# but due to quirks of the URL detection in Git, we mis-parse
+	# the absolute path as a bogus URL and die before that step.
+	#
+	# This works for now, and if we ever fix the URL detection, it
+	# is OK to change this to detect the transport error.
+	grep "protocol .* is not supported" err
+'
+
+test_done
diff --git a/t/t5700-protocol-v1.sh b/t/t5700-protocol-v1.sh
index 022901b..a73b4d4 100755
--- a/t/t5700-protocol-v1.sh
+++ b/t/t5700-protocol-v1.sh
@@ -8,6 +8,9 @@ TEST_NO_CREATE_REPO=1
 GIT_TEST_PROTOCOL_VERSION=0
 export GIT_TEST_PROTOCOL_VERSION
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 # Test protocol v1 with 'git://' transport
@@ -41,7 +44,7 @@ test_expect_success 'fetch with git:// using protocol v1' '
 	GIT_TRACE_PACKET=1 git -C daemon_child -c protocol.version=1 \
 		fetch 2>log &&
 
-	git -C daemon_child log -1 --format=%s origin/master >actual &&
+	git -C daemon_child log -1 --format=%s origin/main >actual &&
 	git -C "$daemon_parent" log -1 --format=%s >expect &&
 	test_cmp expect actual &&
 
@@ -69,7 +72,7 @@ test_expect_success 'push with git:// using protocol v1' '
 	test_commit -C daemon_child three &&
 
 	# Push to another branch, as the target repository has the
-	# master branch checked out and we cannot push into it.
+	# main branch checked out and we cannot push into it.
 	GIT_TRACE_PACKET=1 git -C daemon_child -c protocol.version=1 \
 		push origin HEAD:client_branch 2>log &&
 
@@ -110,7 +113,7 @@ test_expect_success 'fetch with file:// using protocol v1' '
 	GIT_TRACE_PACKET=1 git -C file_child -c protocol.version=1 \
 		fetch 2>log &&
 
-	git -C file_child log -1 --format=%s origin/master >actual &&
+	git -C file_child log -1 --format=%s origin/main >actual &&
 	git -C file_parent log -1 --format=%s >expect &&
 	test_cmp expect actual &&
 
@@ -134,7 +137,7 @@ test_expect_success 'push with file:// using protocol v1' '
 	test_commit -C file_child three &&
 
 	# Push to another branch, as the target repository has the
-	# master branch checked out and we cannot push into it.
+	# main branch checked out and we cannot push into it.
 	GIT_TRACE_PACKET=1 git -C file_child -c protocol.version=1 \
 		push origin HEAD:client_branch 2>log &&
 
@@ -146,6 +149,21 @@ test_expect_success 'push with file:// using protocol v1' '
 	grep "push< version 1" log
 '
 
+test_expect_success 'cloning branchless tagless but not refless remote' '
+	rm -rf server client &&
+
+	git -c init.defaultbranch=main init server &&
+	echo foo >server/foo.txt &&
+	git -C server add foo.txt &&
+	git -C server commit -m "message" &&
+	git -C server update-ref refs/notbranch/alsonottag HEAD &&
+	git -C server checkout --detach &&
+	git -C server branch -D main &&
+	git -C server symbolic-ref HEAD refs/heads/nonexistentbranch &&
+
+	git -c protocol.version=1 clone "file://$(pwd)/server" client
+'
+
 # Test protocol v1 with 'ssh://' transport
 #
 test_expect_success 'setup ssh wrapper' '
@@ -188,7 +206,7 @@ test_expect_success 'fetch with ssh:// using protocol v1' '
 		fetch 2>log &&
 	expect_ssh git-upload-pack &&
 
-	git -C ssh_child log -1 --format=%s origin/master >actual &&
+	git -C ssh_child log -1 --format=%s origin/main >actual &&
 	git -C ssh_parent log -1 --format=%s >expect &&
 	test_cmp expect actual &&
 
@@ -213,7 +231,7 @@ test_expect_success 'push with ssh:// using protocol v1' '
 	test_commit -C ssh_child three &&
 
 	# Push to another branch, as the target repository has the
-	# master branch checked out and we cannot push into it.
+	# main branch checked out and we cannot push into it.
 	GIT_TRACE_PACKET=1 git -C ssh_child -c protocol.version=1 \
 		push origin HEAD:client_branch 2>log &&
 	expect_ssh git-receive-pack &&
@@ -226,15 +244,28 @@ test_expect_success 'push with ssh:// using protocol v1' '
 	grep "push< version 1" log
 '
 
+test_expect_success 'clone propagates object-format from empty repo' '
+	test_when_finished "rm -fr src256 dst256" &&
+
+	echo sha256 >expect &&
+	git init --object-format=sha256 src256 &&
+	git clone --no-local src256 dst256 &&
+	git -C dst256 rev-parse --show-object-format >actual &&
+
+	test_cmp expect actual
+'
+
 # Test protocol v1 with 'http://' transport
 #
 . "$TEST_DIRECTORY"/lib-httpd.sh
 start_httpd
 
-test_expect_success 'create repo to be served by http:// transport' '
+test_expect_success 'create repos to be served by http:// transport' '
 	git init "$HTTPD_DOCUMENT_ROOT_PATH/http_parent" &&
 	git -C "$HTTPD_DOCUMENT_ROOT_PATH/http_parent" config http.receivepack true &&
-	test_commit -C "$HTTPD_DOCUMENT_ROOT_PATH/http_parent" one
+	test_commit -C "$HTTPD_DOCUMENT_ROOT_PATH/http_parent" one &&
+	git init --object-format=sha256 "$HTTPD_DOCUMENT_ROOT_PATH/sha256" &&
+	git -C "$HTTPD_DOCUMENT_ROOT_PATH/sha256" config http.receivepack true
 '
 
 test_expect_success 'clone with http:// using protocol v1' '
@@ -251,13 +282,27 @@ test_expect_success 'clone with http:// using protocol v1' '
 	grep "git< version 1" log
 '
 
+test_expect_success 'clone with http:// using protocol v1 with empty SHA-256 repo' '
+	GIT_TRACE_PACKET=1 GIT_TRACE_CURL=1 git -c protocol.version=1 \
+		clone "$HTTPD_URL/smart/sha256" sha256 2>log &&
+
+	echo sha256 >expect &&
+	git -C sha256 rev-parse --show-object-format >actual &&
+	test_cmp expect actual &&
+
+	# Client requested to use protocol v1
+	grep "Git-Protocol: version=1" log &&
+	# Server responded using protocol v1
+	grep "git< version 1" log
+'
+
 test_expect_success 'fetch with http:// using protocol v1' '
 	test_commit -C "$HTTPD_DOCUMENT_ROOT_PATH/http_parent" two &&
 
 	GIT_TRACE_PACKET=1 git -C http_child -c protocol.version=1 \
 		fetch 2>log &&
 
-	git -C http_child log -1 --format=%s origin/master >actual &&
+	git -C http_child log -1 --format=%s origin/main >actual &&
 	git -C "$HTTPD_DOCUMENT_ROOT_PATH/http_parent" log -1 --format=%s >expect &&
 	test_cmp expect actual &&
 
@@ -281,7 +326,7 @@ test_expect_success 'push with http:// using protocol v1' '
 	test_commit -C http_child three &&
 
 	# Push to another branch, as the target repository has the
-	# master branch checked out and we cannot push into it.
+	# main branch checked out and we cannot push into it.
 	GIT_TRACE_PACKET=1 git -C http_child -c protocol.version=1 \
 		push origin HEAD:client_branch && #2>log &&
 
diff --git a/t/t5701-git-serve.sh b/t/t5701-git-serve.sh
index a1f5fdc..c48830d 100755
--- a/t/t5701-git-serve.sh
+++ b/t/t5701-git-serve.sh
@@ -2,6 +2,10 @@
 
 test_description='test protocol v2 server commands'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'test capability advertisement' '
@@ -9,15 +13,18 @@ test_expect_success 'test capability advertisement' '
 	wrong_algo sha1:sha256
 	wrong_algo sha256:sha1
 	EOF
-	cat >expect <<-EOF &&
+	cat >expect.base <<-EOF &&
 	version 2
 	agent=git/$(git version | cut -d" " -f3)
-	ls-refs
-	fetch=shallow
+	ls-refs=unborn
+	fetch=shallow wait-for-done
 	server-option
 	object-format=$(test_oid algo)
+	EOF
+	cat >expect.trailer <<-EOF &&
 	0000
 	EOF
+	cat expect.base expect.trailer >expect &&
 
 	GIT_TEST_SIDEBAND_ALL=0 test-tool serve-v2 \
 		--advertise-capabilities >out &&
@@ -44,7 +51,7 @@ test_expect_success 'request invalid capability' '
 	0000
 	EOF
 	test_must_fail test-tool serve-v2 --stateless-rpc 2>err <in &&
-	test_i18ngrep "unknown capability" err
+	test_grep "unknown capability" err
 '
 
 test_expect_success 'request with no command' '
@@ -54,7 +61,7 @@ test_expect_success 'request with no command' '
 	0000
 	EOF
 	test_must_fail test-tool serve-v2 --stateless-rpc 2>err <in &&
-	test_i18ngrep "no command requested" err
+	test_grep "no command requested" err
 '
 
 test_expect_success 'request invalid command' '
@@ -65,7 +72,38 @@ test_expect_success 'request invalid command' '
 	0000
 	EOF
 	test_must_fail test-tool serve-v2 --stateless-rpc 2>err <in &&
-	test_i18ngrep "invalid command" err
+	test_grep "invalid command" err
+'
+
+test_expect_success 'request capability as command' '
+	test-tool pkt-line pack >in <<-EOF &&
+	command=agent
+	object-format=$(test_oid algo)
+	0000
+	EOF
+	test_must_fail test-tool serve-v2 --stateless-rpc 2>err <in &&
+	grep invalid.command.*agent err
+'
+
+test_expect_success 'request command as capability' '
+	test-tool pkt-line pack >in <<-EOF &&
+	command=ls-refs
+	object-format=$(test_oid algo)
+	fetch
+	0000
+	EOF
+	test_must_fail test-tool serve-v2 --stateless-rpc 2>err <in &&
+	grep unknown.capability err
+'
+
+test_expect_success 'requested command is command=value' '
+	test-tool pkt-line pack >in <<-EOF &&
+	command=ls-refs=whatever
+	object-format=$(test_oid algo)
+	0000
+	EOF
+	test_must_fail test-tool serve-v2 --stateless-rpc 2>err <in &&
+	grep invalid.command.*ls-refs=whatever err
 '
 
 test_expect_success 'wrong object-format' '
@@ -76,16 +114,16 @@ test_expect_success 'wrong object-format' '
 	0000
 	EOF
 	test_must_fail test-tool serve-v2 --stateless-rpc 2>err <in &&
-	test_i18ngrep "mismatched object format" err
+	test_grep "mismatched object format" err
 '
 
 # Test the basics of ls-refs
 #
 test_expect_success 'setup some refs and tags' '
 	test_commit one &&
-	git branch dev master &&
+	git branch dev main &&
 	test_commit two &&
-	git symbolic-ref refs/heads/release refs/heads/master &&
+	git symbolic-ref refs/heads/release refs/heads/main &&
 	git tag -a -m "annotated tag" annotated-tag
 '
 
@@ -99,7 +137,7 @@ test_expect_success 'basics of ls-refs' '
 	cat >expect <<-EOF &&
 	$(git rev-parse HEAD) HEAD
 	$(git rev-parse refs/heads/dev) refs/heads/dev
-	$(git rev-parse refs/heads/master) refs/heads/master
+	$(git rev-parse refs/heads/main) refs/heads/main
 	$(git rev-parse refs/heads/release) refs/heads/release
 	$(git rev-parse refs/tags/annotated-tag) refs/tags/annotated-tag
 	$(git rev-parse refs/tags/one) refs/tags/one
@@ -112,18 +150,31 @@ test_expect_success 'basics of ls-refs' '
 	test_cmp expect actual
 '
 
+test_expect_success 'ls-refs complains about unknown options' '
+	test-tool pkt-line pack >in <<-EOF &&
+	command=ls-refs
+	object-format=$(test_oid algo)
+	0001
+	no-such-arg
+	0000
+	EOF
+
+	test_must_fail test-tool serve-v2 --stateless-rpc 2>err <in &&
+	grep unexpected.line.*no-such-arg err
+'
+
 test_expect_success 'basic ref-prefixes' '
 	test-tool pkt-line pack >in <<-EOF &&
 	command=ls-refs
 	object-format=$(test_oid algo)
 	0001
-	ref-prefix refs/heads/master
+	ref-prefix refs/heads/main
 	ref-prefix refs/tags/one
 	0000
 	EOF
 
 	cat >expect <<-EOF &&
-	$(git rev-parse refs/heads/master) refs/heads/master
+	$(git rev-parse refs/heads/main) refs/heads/main
 	$(git rev-parse refs/tags/one) refs/tags/one
 	0000
 	EOF
@@ -144,7 +195,7 @@ test_expect_success 'refs/heads prefix' '
 
 	cat >expect <<-EOF &&
 	$(git rev-parse refs/heads/dev) refs/heads/dev
-	$(git rev-parse refs/heads/master) refs/heads/master
+	$(git rev-parse refs/heads/main) refs/heads/main
 	$(git rev-parse refs/heads/release) refs/heads/release
 	0000
 	EOF
@@ -154,6 +205,37 @@ test_expect_success 'refs/heads prefix' '
 	test_cmp expect actual
 '
 
+test_expect_success 'ignore very large set of prefixes' '
+	# generate a large number of ref-prefixes that we expect
+	# to match nothing; the value here exceeds TOO_MANY_PREFIXES
+	# from ls-refs.c.
+	{
+		echo command=ls-refs &&
+		echo object-format=$(test_oid algo) &&
+		echo 0001 &&
+		perl -le "print \"ref-prefix refs/heads/\$_\" for (1..65536)" &&
+		echo 0000
+	} |
+	test-tool pkt-line pack >in &&
+
+	# and then confirm that we see unmatched prefixes anyway (i.e.,
+	# that the prefix was not applied).
+	cat >expect <<-EOF &&
+	$(git rev-parse HEAD) HEAD
+	$(git rev-parse refs/heads/dev) refs/heads/dev
+	$(git rev-parse refs/heads/main) refs/heads/main
+	$(git rev-parse refs/heads/release) refs/heads/release
+	$(git rev-parse refs/tags/annotated-tag) refs/tags/annotated-tag
+	$(git rev-parse refs/tags/one) refs/tags/one
+	$(git rev-parse refs/tags/two) refs/tags/two
+	0000
+	EOF
+
+	test-tool serve-v2 --stateless-rpc <in >out &&
+	test-tool pkt-line unpack <out >actual &&
+	test_cmp expect actual
+'
+
 test_expect_success 'peel parameter' '
 	test-tool pkt-line pack >in <<-EOF &&
 	command=ls-refs
@@ -188,8 +270,8 @@ test_expect_success 'symrefs parameter' '
 
 	cat >expect <<-EOF &&
 	$(git rev-parse refs/heads/dev) refs/heads/dev
-	$(git rev-parse refs/heads/master) refs/heads/master
-	$(git rev-parse refs/heads/release) refs/heads/release symref-target:refs/heads/master
+	$(git rev-parse refs/heads/main) refs/heads/main
+	$(git rev-parse refs/heads/release) refs/heads/release symref-target:refs/heads/main
 	0000
 	EOF
 
@@ -237,4 +319,87 @@ test_expect_success 'unexpected lines are not allowed in fetch request' '
 	grep "unexpected line: .this-is-not-a-command." err
 '
 
+# Test the basics of object-info
+#
+test_expect_success 'basics of object-info' '
+	test_config transfer.advertiseObjectInfo true &&
+
+	test-tool pkt-line pack >in <<-EOF &&
+	command=object-info
+	object-format=$(test_oid algo)
+	0001
+	size
+	oid $(git rev-parse two:two.t)
+	oid $(git rev-parse two:two.t)
+	0000
+	EOF
+
+	cat >expect <<-EOF &&
+	size
+	$(git rev-parse two:two.t) $(wc -c <two.t | xargs)
+	$(git rev-parse two:two.t) $(wc -c <two.t | xargs)
+	0000
+	EOF
+
+	test-tool serve-v2 --stateless-rpc <in >out &&
+	test-tool pkt-line unpack <out >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'test capability advertisement with uploadpack.advertiseBundleURIs' '
+	test_config uploadpack.advertiseBundleURIs true &&
+
+	cat >expect.extra <<-EOF &&
+	bundle-uri
+	EOF
+	cat expect.base \
+	    expect.extra \
+	    expect.trailer >expect &&
+
+	GIT_TEST_SIDEBAND_ALL=0 test-tool serve-v2 \
+		--advertise-capabilities >out &&
+	test-tool pkt-line unpack <out >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'basics of bundle-uri: dies if not enabled' '
+	test-tool pkt-line pack >in <<-EOF &&
+	command=bundle-uri
+	0000
+	EOF
+
+	cat >err.expect <<-\EOF &&
+	fatal: invalid command '"'"'bundle-uri'"'"'
+	EOF
+
+	cat >expect <<-\EOF &&
+	ERR serve: invalid command '"'"'bundle-uri'"'"'
+	EOF
+
+	test_must_fail test-tool serve-v2 --stateless-rpc <in >out 2>err.actual &&
+	test_cmp err.expect err.actual &&
+	test_must_be_empty out
+'
+
+test_expect_success 'object-info missing from capabilities when disabled' '
+	test_config transfer.advertiseObjectInfo false &&
+
+	GIT_TEST_SIDEBAND_ALL=0 test-tool serve-v2 \
+		--advertise-capabilities >out &&
+	test-tool pkt-line unpack <out >actual &&
+
+	! grep object.info actual
+'
+
+test_expect_success 'object-info commands rejected when disabled' '
+	test_config transfer.advertiseObjectInfo false &&
+
+	test-tool pkt-line pack >in <<-EOF &&
+	command=object-info
+	EOF
+
+	test_must_fail test-tool serve-v2 --stateless-rpc <in 2>err &&
+	grep invalid.command err
+'
+
 test_done
diff --git a/t/t5702-protocol-v2.sh b/t/t5702-protocol-v2.sh
index 5a60fbe..1ef540f 100755
--- a/t/t5702-protocol-v2.sh
+++ b/t/t5702-protocol-v2.sh
@@ -4,6 +4,9 @@ test_description='test git wire-protocol version 2'
 
 TEST_NO_CREATE_REPO=1
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 # Test protocol v2 with 'git://' transport
@@ -24,9 +27,9 @@ test_expect_success 'list refs with git:// using protocol v2' '
 		ls-remote --symref "$GIT_DAEMON_URL/parent" >actual &&
 
 	# Client requested to use protocol v2
-	grep "git> .*\\\0\\\0version=2\\\0$" log &&
+	grep "ls-remote> .*\\\0\\\0version=2\\\0$" log &&
 	# Server responded using protocol v2
-	grep "git< version 2" log &&
+	grep "ls-remote< version 2" log &&
 
 	git ls-remote --symref "$GIT_DAEMON_URL/parent" >expect &&
 	test_cmp expect actual
@@ -36,10 +39,10 @@ test_expect_success 'ref advertisement is filtered with ls-remote using protocol
 	test_when_finished "rm -f log" &&
 
 	GIT_TRACE_PACKET="$(pwd)/log" git -c protocol.version=2 \
-		ls-remote "$GIT_DAEMON_URL/parent" master >actual &&
+		ls-remote "$GIT_DAEMON_URL/parent" main >actual &&
 
 	cat >expect <<-EOF &&
-	$(git -C "$daemon_parent" rev-parse refs/heads/master)$(printf "\t")refs/heads/master
+	$(git -C "$daemon_parent" rev-parse refs/heads/main)$(printf "\t")refs/heads/main
 	EOF
 
 	test_cmp expect actual
@@ -69,7 +72,7 @@ test_expect_success 'fetch with git:// using protocol v2' '
 	GIT_TRACE_PACKET="$(pwd)/log" git -C daemon_child -c protocol.version=2 \
 		fetch &&
 
-	git -C daemon_child log -1 --format=%s origin/master >actual &&
+	git -C daemon_child log -1 --format=%s origin/main >actual &&
 	git -C "$daemon_parent" log -1 --format=%s >expect &&
 	test_cmp expect actual &&
 
@@ -118,7 +121,7 @@ test_expect_success 'push with git:// and a config of v2 does not request v2' '
 	test_commit -C daemon_child three &&
 
 	# Push to another branch, as the target repository has the
-	# master branch checked out and we cannot push into it.
+	# main branch checked out and we cannot push into it.
 	GIT_TRACE_PACKET="$(pwd)/log" git -C daemon_child -c protocol.version=2 \
 		push origin HEAD:client_branch &&
 
@@ -148,7 +151,7 @@ test_expect_success 'list refs with file:// using protocol v2' '
 		ls-remote --symref "file://$(pwd)/file_parent" >actual &&
 
 	# Server responded using protocol v2
-	grep "git< version 2" log &&
+	grep "ls-remote< version 2" log &&
 
 	git ls-remote --symref "file://$(pwd)/file_parent" >expect &&
 	test_cmp expect actual
@@ -158,10 +161,10 @@ test_expect_success 'ref advertisement is filtered with ls-remote using protocol
 	test_when_finished "rm -f log" &&
 
 	GIT_TRACE_PACKET="$(pwd)/log" git -c protocol.version=2 \
-		ls-remote "file://$(pwd)/file_parent" master >actual &&
+		ls-remote "file://$(pwd)/file_parent" main >actual &&
 
 	cat >expect <<-EOF &&
-	$(git -C file_parent rev-parse refs/heads/master)$(printf "\t")refs/heads/master
+	$(git -C file_parent rev-parse refs/heads/main)$(printf "\t")refs/heads/main
 	EOF
 
 	test_cmp expect actual
@@ -171,10 +174,10 @@ test_expect_success 'server-options are sent when using ls-remote' '
 	test_when_finished "rm -f log" &&
 
 	GIT_TRACE_PACKET="$(pwd)/log" git -c protocol.version=2 \
-		ls-remote -o hello -o world "file://$(pwd)/file_parent" master >actual &&
+		ls-remote -o hello -o world "file://$(pwd)/file_parent" main >actual &&
 
 	cat >expect <<-EOF &&
-	$(git -C file_parent rev-parse refs/heads/master)$(printf "\t")refs/heads/master
+	$(git -C file_parent rev-parse refs/heads/main)$(printf "\t")refs/heads/main
 	EOF
 
 	test_cmp expect actual &&
@@ -184,10 +187,10 @@ test_expect_success 'server-options are sent when using ls-remote' '
 
 test_expect_success 'warn if using server-option with ls-remote with legacy protocol' '
 	test_must_fail env GIT_TEST_PROTOCOL_VERSION=0 git -c protocol.version=0 \
-		ls-remote -o hello -o world "file://$(pwd)/file_parent" master 2>err &&
+		ls-remote -o hello -o world "file://$(pwd)/file_parent" main 2>err &&
 
-	test_i18ngrep "see protocol.version in" err &&
-	test_i18ngrep "server options require protocol version 2 or later" err
+	test_grep "see protocol.version in" err &&
+	test_grep "server options require protocol version 2 or later" err
 '
 
 test_expect_success 'clone with file:// using protocol v2' '
@@ -209,6 +212,126 @@ test_expect_success 'clone with file:// using protocol v2' '
 	grep "ref-prefix refs/tags/" log
 '
 
+test_expect_success 'clone of empty repo propagates name of default branch' '
+	test_when_finished "rm -rf file_empty_parent file_empty_child" &&
+
+	GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME= \
+	git -c init.defaultBranch=mydefaultbranch init file_empty_parent &&
+
+	GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME= \
+	git -c init.defaultBranch=main -c protocol.version=2 \
+		clone "file://$(pwd)/file_empty_parent" file_empty_child &&
+	echo refs/heads/mydefaultbranch >expect &&
+	git -C file_empty_child symbolic-ref HEAD >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success '...but not if explicitly forbidden by config' '
+	test_when_finished "rm -rf file_empty_parent file_empty_child" &&
+
+	GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME= \
+	git -c init.defaultBranch=mydefaultbranch init file_empty_parent &&
+	test_config -C file_empty_parent lsrefs.unborn ignore &&
+
+	GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME= \
+	git -c init.defaultBranch=main -c protocol.version=2 \
+		clone "file://$(pwd)/file_empty_parent" file_empty_child &&
+	echo refs/heads/main >expect &&
+	git -C file_empty_child symbolic-ref HEAD >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'bare clone propagates empty default branch' '
+	test_when_finished "rm -rf file_empty_parent file_empty_child.git" &&
+
+	GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME= \
+	git -c init.defaultBranch=mydefaultbranch init file_empty_parent &&
+
+	GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME= \
+	git -c init.defaultBranch=main -c protocol.version=2 \
+		clone --bare \
+		"file://$(pwd)/file_empty_parent" file_empty_child.git &&
+	echo "refs/heads/mydefaultbranch" >expect &&
+	git -C file_empty_child.git symbolic-ref HEAD >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'clone propagates unborn HEAD from non-empty repo' '
+	test_when_finished "rm -rf file_unborn_parent file_unborn_child" &&
+
+	git init file_unborn_parent &&
+	(
+		cd file_unborn_parent &&
+		git checkout -b branchwithstuff &&
+		test_commit --no-tag stuff &&
+		git symbolic-ref HEAD refs/heads/mydefaultbranch
+	) &&
+
+	GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME= \
+	git -c init.defaultBranch=main -c protocol.version=2 \
+		clone "file://$(pwd)/file_unborn_parent" \
+		file_unborn_child 2>stderr &&
+	echo "refs/heads/mydefaultbranch" >expect &&
+	git -C file_unborn_child symbolic-ref HEAD >actual &&
+	test_cmp expect actual &&
+	grep "warning: remote HEAD refers to nonexistent ref" stderr
+'
+
+test_expect_success 'clone propagates object-format from empty repo' '
+	test_when_finished "rm -fr src256 dst256" &&
+
+	echo sha256 >expect &&
+	git init --object-format=sha256 src256 &&
+	git clone src256 dst256 &&
+	git -C dst256 rev-parse --show-object-format >actual &&
+
+	test_cmp expect actual
+'
+
+test_expect_success 'bare clone propagates unborn HEAD from non-empty repo' '
+	test_when_finished "rm -rf file_unborn_parent file_unborn_child.git" &&
+
+	git init file_unborn_parent &&
+	(
+		cd file_unborn_parent &&
+		git checkout -b branchwithstuff &&
+		test_commit --no-tag stuff &&
+		git symbolic-ref HEAD refs/heads/mydefaultbranch
+	) &&
+
+	GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME= \
+	git -c init.defaultBranch=main -c protocol.version=2 \
+		clone --bare "file://$(pwd)/file_unborn_parent" \
+		file_unborn_child.git 2>stderr &&
+	echo "refs/heads/mydefaultbranch" >expect &&
+	git -C file_unborn_child.git symbolic-ref HEAD >actual &&
+	test_cmp expect actual &&
+	! grep "warning:" stderr
+'
+
+test_expect_success 'defaulted HEAD uses remote branch if available' '
+	test_when_finished "rm -rf file_unborn_parent file_unborn_child" &&
+
+	git init file_unborn_parent &&
+	(
+		cd file_unborn_parent &&
+		git config lsrefs.unborn ignore &&
+		git checkout -b branchwithstuff &&
+		test_commit --no-tag stuff &&
+		git symbolic-ref HEAD refs/heads/mydefaultbranch
+	) &&
+
+	GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME= \
+	git -c init.defaultBranch=branchwithstuff -c protocol.version=2 \
+		clone "file://$(pwd)/file_unborn_parent" \
+		file_unborn_child 2>stderr &&
+	echo "refs/heads/branchwithstuff" >expect &&
+	git -C file_unborn_child symbolic-ref HEAD >actual &&
+	test_cmp expect actual &&
+	test_path_is_file file_unborn_child/stuff.t &&
+	! grep "warning:" stderr
+'
+
 test_expect_success 'fetch with file:// using protocol v2' '
 	test_when_finished "rm -f log" &&
 
@@ -217,7 +340,7 @@ test_expect_success 'fetch with file:// using protocol v2' '
 	GIT_TRACE_PACKET="$(pwd)/log" git -C file_child -c protocol.version=2 \
 		fetch origin &&
 
-	git -C file_child log -1 --format=%s origin/master >actual &&
+	git -C file_child log -1 --format=%s origin/main >actual &&
 	git -C file_parent log -1 --format=%s >expect &&
 	test_cmp expect actual &&
 
@@ -232,13 +355,13 @@ test_expect_success 'ref advertisement is filtered during fetch using protocol v
 	git -C file_parent branch unwanted-branch three &&
 
 	GIT_TRACE_PACKET="$(pwd)/log" git -C file_child -c protocol.version=2 \
-		fetch origin master &&
+		fetch origin main &&
 
-	git -C file_child log -1 --format=%s origin/master >actual &&
+	git -C file_child log -1 --format=%s origin/main >actual &&
 	git -C file_parent log -1 --format=%s >expect &&
 	test_cmp expect actual &&
 
-	grep "refs/heads/master" log &&
+	grep "refs/heads/main" log &&
 	! grep "refs/heads/unwanted-branch" log
 '
 
@@ -248,9 +371,9 @@ test_expect_success 'server-options are sent when fetching' '
 	test_commit -C file_parent four &&
 
 	GIT_TRACE_PACKET="$(pwd)/log" git -C file_child -c protocol.version=2 \
-		fetch -o hello -o world origin master &&
+		fetch -o hello -o world origin main &&
 
-	git -C file_child log -1 --format=%s origin/master >actual &&
+	git -C file_child log -1 --format=%s origin/main >actual &&
 	git -C file_parent log -1 --format=%s >expect &&
 	test_cmp expect actual &&
 
@@ -264,10 +387,10 @@ test_expect_success 'warn if using server-option with fetch with legacy protocol
 	git init temp_child &&
 
 	test_must_fail env GIT_TEST_PROTOCOL_VERSION=0 git -C temp_child -c protocol.version=0 \
-		fetch -o hello -o world "file://$(pwd)/file_parent" master 2>err &&
+		fetch -o hello -o world "file://$(pwd)/file_parent" main 2>err &&
 
-	test_i18ngrep "see protocol.version in" err &&
-	test_i18ngrep "server options require protocol version 2 or later" err
+	test_grep "see protocol.version in" err &&
+	test_grep "server options require protocol version 2 or later" err
 '
 
 test_expect_success 'server-options are sent when cloning' '
@@ -288,8 +411,8 @@ test_expect_success 'warn if using server-option with clone with legacy protocol
 		clone --server-option=hello --server-option=world \
 		"file://$(pwd)/file_parent" myclone 2>err &&
 
-	test_i18ngrep "see protocol.version in" err &&
-	test_i18ngrep "server options require protocol version 2 or later" err
+	test_grep "see protocol.version in" err &&
+	test_grep "server options require protocol version 2 or later" err
 '
 
 test_expect_success 'upload-pack respects config using protocol v2' '
@@ -325,7 +448,7 @@ test_expect_success 'partial clone' '
 	grep "version 2" trace &&
 
 	# Ensure that the old version of the file is missing
-	git -C client rev-list --quiet --objects --missing=print master \
+	git -C client rev-list --quiet --objects --missing=print main \
 		>observed.oids &&
 	grep "$(git -C server rev-parse message1:a.txt)" observed.oids &&
 
@@ -350,7 +473,7 @@ test_expect_success 'partial fetch' '
 	SERVER="file://$(pwd)/server" &&
 
 	GIT_TRACE_PACKET="$(pwd)/trace" git -C client -c protocol.version=2 \
-		fetch --filter=blob:none "$SERVER" master:refs/heads/other &&
+		fetch --filter=blob:none "$SERVER" main:refs/heads/other &&
 	grep "version 2" trace &&
 
 	# Ensure that the old version of the file is missing
@@ -384,7 +507,7 @@ test_expect_success 'partial clone warns if filter is not advertised' '
 	git -C server config uploadpack.allowfilter 0 &&
 	git -c protocol.version=2 \
 		clone --filter=blob:none "file://$(pwd)/server" client 2>err &&
-	test_i18ngrep "filtering not recognized by server, ignoring" err
+	test_grep "filtering not recognized by server, ignoring" err
 '
 
 test_expect_success 'even with handcrafted request, filter does not work if not advertised' '
@@ -395,7 +518,7 @@ test_expect_success 'even with handcrafted request, filter does not work if not
 	command=fetch
 	object-format=$(test_oid algo)
 	0001
-	want $(git -C server rev-parse master)
+	want $(git -C server rev-parse main)
 	filter blob:none
 	0000
 	EOF
@@ -539,7 +662,7 @@ test_expect_success 'deepen-relative' '
 	test_commit -C server four &&
 
 	# Sanity check that only "three" is downloaded
-	git -C client log --pretty=tformat:%s master >actual &&
+	git -C client log --pretty=tformat:%s main >actual &&
 	echo three >expected &&
 	test_cmp expected actual &&
 
@@ -548,7 +671,7 @@ test_expect_success 'deepen-relative' '
 	# Ensure that protocol v2 is used
 	grep "fetch< version 2" trace &&
 
-	git -C client log --pretty=tformat:%s origin/master >actual &&
+	git -C client log --pretty=tformat:%s origin/main >actual &&
 	cat >expected <<-\EOF &&
 	four
 	three
@@ -557,6 +680,123 @@ test_expect_success 'deepen-relative' '
 	test_cmp expected actual
 '
 
+setup_negotiate_only () {
+	SERVER="$1"
+	URI="$2"
+
+	rm -rf "$SERVER" client
+
+	git init "$SERVER"
+	test_commit -C "$SERVER" one
+	test_commit -C "$SERVER" two
+
+	git clone "$URI" client
+	test_commit -C client three
+}
+
+test_expect_success 'usage: --negotiate-only without --negotiation-tip' '
+	SERVER="server" &&
+	URI="file://$(pwd)/server" &&
+
+	setup_negotiate_only "$SERVER" "$URI" &&
+
+	cat >err.expect <<-\EOF &&
+	fatal: --negotiate-only needs one or more --negotiation-tip=*
+	EOF
+
+	test_must_fail git -c protocol.version=2 -C client fetch \
+		--negotiate-only \
+		origin 2>err.actual &&
+	test_cmp err.expect err.actual
+'
+
+test_expect_success 'usage: --negotiate-only with --recurse-submodules' '
+	cat >err.expect <<-\EOF &&
+	fatal: options '\''--negotiate-only'\'' and '\''--recurse-submodules'\'' cannot be used together
+	EOF
+
+	test_must_fail git -c protocol.version=2 -C client fetch \
+		--negotiate-only \
+		--recurse-submodules \
+		origin 2>err.actual &&
+	test_cmp err.expect err.actual
+'
+
+test_expect_success 'file:// --negotiate-only' '
+	SERVER="server" &&
+	URI="file://$(pwd)/server" &&
+
+	setup_negotiate_only "$SERVER" "$URI" &&
+
+	git -c protocol.version=2 -C client fetch \
+		--no-tags \
+		--negotiate-only \
+		--negotiation-tip=$(git -C client rev-parse HEAD) \
+		origin >out &&
+	COMMON=$(git -C "$SERVER" rev-parse two) &&
+	grep "$COMMON" out
+'
+
+test_expect_success 'file:// --negotiate-only with protocol v0' '
+	SERVER="server" &&
+	URI="file://$(pwd)/server" &&
+
+	setup_negotiate_only "$SERVER" "$URI" &&
+
+	test_must_fail git -c protocol.version=0 -C client fetch \
+		--no-tags \
+		--negotiate-only \
+		--negotiation-tip=$(git -C client rev-parse HEAD) \
+		origin 2>err &&
+	test_grep "negotiate-only requires protocol v2" err
+'
+
+test_expect_success 'push with custom path does not request v2' '
+	rm -f env.trace &&
+	git -C client push \
+		--receive-pack="env >../env.trace; git-receive-pack" \
+		origin HEAD:refs/heads/custom-push-test &&
+	test_path_is_file env.trace &&
+	! grep ^GIT_PROTOCOL env.trace
+'
+
+test_expect_success 'fetch with custom path does request v2' '
+	rm -f env.trace &&
+	git -C client fetch \
+		--upload-pack="env >../env.trace; git-upload-pack" \
+		origin HEAD &&
+	grep ^GIT_PROTOCOL=version=2 env.trace
+'
+
+test_expect_success 'archive with custom path does not request v2' '
+	rm -f env.trace &&
+	git -C client archive \
+		--exec="env >../env.trace; git-upload-archive" \
+		--remote=origin \
+		HEAD >/dev/null &&
+	test_path_is_file env.trace &&
+	! grep ^GIT_PROTOCOL env.trace
+'
+
+test_expect_success 'reject client packfile-uris if not advertised' '
+	{
+		packetize command=fetch &&
+		packetize object-format=$(test_oid algo) &&
+		printf 0001 &&
+		packetize packfile-uris https &&
+		packetize done &&
+		printf 0000
+	} >input &&
+	test_must_fail env GIT_PROTOCOL=version=2 \
+		git upload-pack client <input &&
+	test_must_fail env GIT_PROTOCOL=version=2 \
+		git -c uploadpack.blobpackfileuri \
+		upload-pack client <input &&
+	GIT_PROTOCOL=version=2 \
+		git -c uploadpack.blobpackfileuri=anything \
+		upload-pack client <input
+'
+
 # Test protocol v2 with 'http://' transport
 #
 . "$TEST_DIRECTORY"/lib-httpd.sh
@@ -600,7 +840,7 @@ test_expect_success 'clone repository with http:// using protocol v2 with incomp
 	# Server responded using protocol v2
 	grep "git< version 2" log &&
 	# Client reported appropriate failure
-	test_i18ngrep "bytes of length header were received" err
+	test_grep "bytes of length header were received" err
 '
 
 test_expect_success 'clone repository with http:// using protocol v2 with incomplete pktline body' '
@@ -617,7 +857,7 @@ test_expect_success 'clone repository with http:// using protocol v2 with incomp
 	# Server responded using protocol v2
 	grep "git< version 2" log &&
 	# Client reported appropriate failure
-	test_i18ngrep "bytes of body are still expected" err
+	test_grep "bytes of body are still expected" err
 '
 
 test_expect_success 'clone with http:// using protocol v2 and invalid parameters' '
@@ -647,7 +887,7 @@ test_expect_success 'clone big repository with http:// using protocol v2' '
 		echo "data 0" &&
 		echo "M 644 inline bla.txt" &&
 		echo "data 4" &&
-		echo "bla"
+		echo "bla" || return 1
 	done | git -C "$HTTPD_DOCUMENT_ROOT_PATH/big" fast-import &&
 
 	GIT_TRACE_PACKET="$(pwd)/log" GIT_TRACE_CURL="$(pwd)/log" git \
@@ -670,7 +910,7 @@ test_expect_success 'fetch with http:// using protocol v2' '
 	GIT_TRACE_PACKET="$(pwd)/log" git -C http_child -c protocol.version=2 \
 		fetch &&
 
-	git -C http_child log -1 --format=%s origin/master >actual &&
+	git -C http_child log -1 --format=%s origin/main >actual &&
 	git -C "$HTTPD_DOCUMENT_ROOT_PATH/http_parent" log -1 --format=%s >expect &&
 	test_cmp expect actual &&
 
@@ -698,11 +938,11 @@ test_expect_success 'fetch from namespaced repo respects namespaces' '
 	test_commit -C "$HTTPD_DOCUMENT_ROOT_PATH/nsrepo" one &&
 	test_commit -C "$HTTPD_DOCUMENT_ROOT_PATH/nsrepo" two &&
 	git -C "$HTTPD_DOCUMENT_ROOT_PATH/nsrepo" \
-		update-ref refs/namespaces/ns/refs/heads/master one &&
+		update-ref refs/namespaces/ns/refs/heads/main one &&
 
 	GIT_TRACE_PACKET="$(pwd)/log" git -C http_child -c protocol.version=2 \
 		fetch "$HTTPD_URL/smart_namespace/nsrepo" \
-		refs/heads/master:refs/heads/theirs &&
+		refs/heads/main:refs/heads/theirs &&
 
 	# Server responded using protocol v2
 	grep "fetch< version 2" log &&
@@ -733,7 +973,7 @@ test_expect_success 'push with http:// and a config of v2 does not request v2' '
 	test_commit -C http_child three &&
 
 	# Push to another branch, as the target repository has the
-	# master branch checked out and we cannot push into it.
+	# main branch checked out and we cannot push into it.
 	GIT_TRACE_PACKET="$(pwd)/log" git -C http_child -c protocol.version=2 \
 		push origin HEAD:client_branch &&
 
@@ -764,7 +1004,7 @@ test_expect_success 'when server sends "ready", expect DELIM' '
 
 	test_must_fail git -C http_child -c protocol.version=2 \
 		fetch "$HTTPD_URL/one_time_perl/http_parent" 2> err &&
-	test_i18ngrep "expected packfile to be sent after .ready." err
+	test_grep "expected packfile to be sent after .ready." err
 '
 
 test_expect_success 'when server does not send "ready", expect FLUSH' '
@@ -792,7 +1032,7 @@ test_expect_success 'when server does not send "ready", expect FLUSH' '
 		fetch "$HTTPD_URL/one_time_perl/http_parent" 2> err &&
 	grep "fetch< .*acknowledgments" log &&
 	! grep "fetch< .*ready" log &&
-	test_i18ngrep "expected no other sections to be sent after no .ready." err
+	test_grep "expected no other sections to be sent after no .ready." err
 '
 
 configure_exclusion () {
@@ -830,7 +1070,7 @@ test_expect_success 'part of packfile response provided as URI' '
 	do
 		git verify-pack --object-format=$(test_oid algo) --verbose $idx >out &&
 		{
-			grep "^[0-9a-f]\{16,\} " out || :
+			grep -E "^[0-9a-f]{16,} " out || :
 		} >out.objectlist &&
 		if test_line_count = 1 out.objectlist
 		then
@@ -842,16 +1082,38 @@ test_expect_success 'part of packfile response provided as URI' '
 			then
 				>h2found
 			fi
-		fi
+		fi || return 1
 	done &&
 	test -f hfound &&
 	test -f h2found &&
 
-	# Ensure that there are exactly 6 files (3 .pack and 3 .idx).
-	ls http_child/.git/objects/pack/* >filelist &&
+	# Ensure that there are exactly 3 packfiles with associated .idx
+	ls http_child/.git/objects/pack/*.pack \
+	    http_child/.git/objects/pack/*.idx >filelist &&
 	test_line_count = 6 filelist
 '
 
+test_expect_success 'packfile URIs with fetch instead of clone' '
+	P="$HTTPD_DOCUMENT_ROOT_PATH/http_parent" &&
+	rm -rf "$P" http_child log &&
+
+	git init "$P" &&
+	git -C "$P" config "uploadpack.allowsidebandall" "true" &&
+
+	echo my-blob >"$P/my-blob" &&
+	git -C "$P" add my-blob &&
+	git -C "$P" commit -m x &&
+
+	configure_exclusion "$P" my-blob >h &&
+
+	git init http_child &&
+
+	GIT_TEST_SIDEBAND_ALL=1 \
+	git -C http_child -c protocol.version=2 \
+		-c fetch.uriprotocols=http,https \
+		fetch "$HTTPD_URL/smart/http_parent"
+'
+
 test_expect_success 'fetching with valid packfile URI but invalid hash fails' '
 	P="$HTTPD_DOCUMENT_ROOT_PATH/http_parent" &&
 	rm -rf "$P" http_child log &&
@@ -880,7 +1142,206 @@ test_expect_success 'fetching with valid packfile URI but invalid hash fails' '
 		git -c protocol.version=2 \
 		-c fetch.uriprotocols=http,https \
 		clone "$HTTPD_URL/smart/http_parent" http_child 2>err &&
-	test_i18ngrep "pack downloaded from.*does not match expected hash" err
+	test_grep "pack downloaded from.*does not match expected hash" err
+'
+
+test_expect_success 'packfile-uri with transfer.fsckobjects' '
+	P="$HTTPD_DOCUMENT_ROOT_PATH/http_parent" &&
+	rm -rf "$P" http_child log &&
+
+	git init "$P" &&
+	git -C "$P" config "uploadpack.allowsidebandall" "true" &&
+
+	echo my-blob >"$P/my-blob" &&
+	git -C "$P" add my-blob &&
+	git -C "$P" commit -m x &&
+
+	configure_exclusion "$P" my-blob >h &&
+
+	sane_unset GIT_TEST_SIDEBAND_ALL &&
+	git -c protocol.version=2 -c transfer.fsckobjects=1 \
+		-c fetch.uriprotocols=http,https \
+		clone "$HTTPD_URL/smart/http_parent" http_child &&
+
+	# Ensure that there are exactly 2 packfiles with associated .idx
+	ls http_child/.git/objects/pack/*.pack \
+	    http_child/.git/objects/pack/*.idx >filelist &&
+	test_line_count = 4 filelist
+'
+
+test_expect_success 'packfile-uri with transfer.fsckobjects fails on bad object' '
+	P="$HTTPD_DOCUMENT_ROOT_PATH/http_parent" &&
+	rm -rf "$P" http_child log &&
+
+	git init "$P" &&
+	git -C "$P" config "uploadpack.allowsidebandall" "true" &&
+
+	cat >bogus-commit <<-EOF &&
+	tree $EMPTY_TREE
+	author Bugs Bunny 1234567890 +0000
+	committer Bugs Bunny <bugs@bun.ni> 1234567890 +0000
+
+	This commit object intentionally broken
+	EOF
+	BOGUS=$(git -C "$P" hash-object -t commit -w --stdin --literally <bogus-commit) &&
+	git -C "$P" branch bogus-branch "$BOGUS" &&
+
+	echo my-blob >"$P/my-blob" &&
+	git -C "$P" add my-blob &&
+	git -C "$P" commit -m x &&
+
+	configure_exclusion "$P" my-blob >h &&
+
+	sane_unset GIT_TEST_SIDEBAND_ALL &&
+	test_must_fail git -c protocol.version=2 -c transfer.fsckobjects=1 \
+		-c fetch.uriprotocols=http,https \
+		clone "$HTTPD_URL/smart/http_parent" http_child 2>error &&
+	test_grep "invalid author/committer line - missing email" error
+'
+
+test_expect_success 'packfile-uri with transfer.fsckobjects succeeds when .gitmodules is separate from tree' '
+	P="$HTTPD_DOCUMENT_ROOT_PATH/http_parent" &&
+	rm -rf "$P" http_child &&
+
+	git init "$P" &&
+	git -C "$P" config "uploadpack.allowsidebandall" "true" &&
+
+	echo "[submodule libfoo]" >"$P/.gitmodules" &&
+	echo "path = include/foo" >>"$P/.gitmodules" &&
+	echo "url = git://example.com/git/lib.git" >>"$P/.gitmodules" &&
+	git -C "$P" add .gitmodules &&
+	git -C "$P" commit -m x &&
+
+	configure_exclusion "$P" .gitmodules >h &&
+
+	sane_unset GIT_TEST_SIDEBAND_ALL &&
+	git -c protocol.version=2 -c transfer.fsckobjects=1 \
+		-c fetch.uriprotocols=http,https \
+		clone "$HTTPD_URL/smart/http_parent" http_child &&
+
+	# Ensure that there are exactly 2 packfiles with associated .idx
+	ls http_child/.git/objects/pack/*.pack \
+	    http_child/.git/objects/pack/*.idx >filelist &&
+	test_line_count = 4 filelist
+'
+
+test_expect_success 'packfile-uri with transfer.fsckobjects fails when .gitmodules separate from tree is invalid' '
+	P="$HTTPD_DOCUMENT_ROOT_PATH/http_parent" &&
+	rm -rf "$P" http_child err &&
+
+	git init "$P" &&
+	git -C "$P" config "uploadpack.allowsidebandall" "true" &&
+
+	echo "[submodule \"..\"]" >"$P/.gitmodules" &&
+	echo "path = include/foo" >>"$P/.gitmodules" &&
+	echo "url = git://example.com/git/lib.git" >>"$P/.gitmodules" &&
+	git -C "$P" add .gitmodules &&
+	git -C "$P" commit -m x &&
+
+	configure_exclusion "$P" .gitmodules >h &&
+
+	sane_unset GIT_TEST_SIDEBAND_ALL &&
+	test_must_fail git -c protocol.version=2 -c transfer.fsckobjects=1 \
+		-c fetch.uriprotocols=http,https \
+		clone "$HTTPD_URL/smart/http_parent" http_child 2>err &&
+	test_grep "disallowed submodule name" err
+'
+
+test_expect_success 'packfile-uri path redacted in trace' '
+	P="$HTTPD_DOCUMENT_ROOT_PATH/http_parent" &&
+	rm -rf "$P" http_child log &&
+
+	git init "$P" &&
+	git -C "$P" config "uploadpack.allowsidebandall" "true" &&
+
+	echo my-blob >"$P/my-blob" &&
+	git -C "$P" add my-blob &&
+	git -C "$P" commit -m x &&
+
+	git -C "$P" hash-object my-blob >objh &&
+	git -C "$P" pack-objects "$HTTPD_DOCUMENT_ROOT_PATH/mypack" <objh >packh &&
+	git -C "$P" config --add \
+		"uploadpack.blobpackfileuri" \
+		"$(cat objh) $(cat packh) $HTTPD_URL/dumb/mypack-$(cat packh).pack" &&
+
+	GIT_TRACE_PACKET="$(pwd)/log" \
+	git -c protocol.version=2 \
+		-c fetch.uriprotocols=http,https \
+		clone "$HTTPD_URL/smart/http_parent" http_child &&
+
+	grep -F "clone< \\1$(cat packh) $HTTPD_URL/<redacted>" log
+'
+
+test_expect_success 'packfile-uri path not redacted in trace when GIT_TRACE_REDACT=0' '
+	P="$HTTPD_DOCUMENT_ROOT_PATH/http_parent" &&
+	rm -rf "$P" http_child log &&
+
+	git init "$P" &&
+	git -C "$P" config "uploadpack.allowsidebandall" "true" &&
+
+	echo my-blob >"$P/my-blob" &&
+	git -C "$P" add my-blob &&
+	git -C "$P" commit -m x &&
+
+	git -C "$P" hash-object my-blob >objh &&
+	git -C "$P" pack-objects "$HTTPD_DOCUMENT_ROOT_PATH/mypack" <objh >packh &&
+	git -C "$P" config --add \
+		"uploadpack.blobpackfileuri" \
+		"$(cat objh) $(cat packh) $HTTPD_URL/dumb/mypack-$(cat packh).pack" &&
+
+	GIT_TRACE_PACKET="$(pwd)/log" \
+	GIT_TRACE_REDACT=0 \
+	git -c protocol.version=2 \
+		-c fetch.uriprotocols=http,https \
+		clone "$HTTPD_URL/smart/http_parent" http_child &&
+
+	grep -F "clone< \\1$(cat packh) $HTTPD_URL/dumb/mypack-$(cat packh).pack" log
+'
+
+test_expect_success 'http:// --negotiate-only' '
+	SERVER="$HTTPD_DOCUMENT_ROOT_PATH/server" &&
+	URI="$HTTPD_URL/smart/server" &&
+
+	setup_negotiate_only "$SERVER" "$URI" &&
+
+	git -c protocol.version=2 -C client fetch \
+		--no-tags \
+		--negotiate-only \
+		--negotiation-tip=$(git -C client rev-parse HEAD) \
+		origin >out &&
+	COMMON=$(git -C "$SERVER" rev-parse two) &&
+	grep "$COMMON" out
+'
+
+test_expect_success 'http:// --negotiate-only without wait-for-done support' '
+	SERVER="server" &&
+	URI="$HTTPD_URL/one_time_perl/server" &&
+
+	setup_negotiate_only "$SERVER" "$URI" &&
+
+	echo "s/ wait-for-done/ xxxx-xxx-xxxx/" \
+		>"$HTTPD_ROOT_PATH/one-time-perl" &&
+
+	test_must_fail git -c protocol.version=2 -C client fetch \
+		--no-tags \
+		--negotiate-only \
+		--negotiation-tip=$(git -C client rev-parse HEAD) \
+		origin 2>err &&
+	test_grep "server does not support wait-for-done" err
+'
+
+test_expect_success 'http:// --negotiate-only with protocol v0' '
+	SERVER="$HTTPD_DOCUMENT_ROOT_PATH/server" &&
+	URI="$HTTPD_URL/smart/server" &&
+
+	setup_negotiate_only "$SERVER" "$URI" &&
+
+	test_must_fail git -c protocol.version=0 -C client fetch \
+		--no-tags \
+		--negotiate-only \
+		--negotiation-tip=$(git -C client rev-parse HEAD) \
+		origin 2>err &&
+	test_grep "negotiate-only requires protocol v2" err
 '
 
 # DO NOT add non-httpd-specific tests here, because the last part of this
diff --git a/t/t5703-upload-pack-ref-in-want.sh b/t/t5703-upload-pack-ref-in-want.sh
index d9ecf0f..1910971 100755
--- a/t/t5703-upload-pack-ref-in-want.sh
+++ b/t/t5703-upload-pack-ref-in-want.sh
@@ -16,7 +16,8 @@ get_actual_commits () {
 	test-tool pkt-line unpack-sideband <out >o.pack &&
 	git index-pack o.pack &&
 	git verify-pack -v o.idx >objs &&
-	grep commit objs | cut -d" " -f1 | sort >actual_commits
+	sed -n -e 's/\([0-9a-f][0-9a-f]*\) commit .*/\1/p' objs >objs.sed &&
+	sort >actual_commits <objs.sed
 }
 
 check_output () {
@@ -36,14 +37,39 @@ write_command () {
 	fi
 }
 
+# Write a complete fetch command to stdout, suitable for use with `test-tool
+# pkt-line`. "want-ref", "want", and "have" lines are read from stdin.
+#
+# Examples:
+#
+# write_fetch_command <<-EOF
+# want-ref refs/heads/main
+# have $(git rev-parse a)
+# EOF
+#
+# write_fetch_command <<-EOF
+# want $(git rev-parse b)
+# have $(git rev-parse a)
+# EOF
+#
+write_fetch_command () {
+	write_command fetch &&
+	echo "0001" &&
+	echo "no-progress" &&
+	cat &&
+	echo "done" &&
+	echo "0000"
+}
+
 # c(o/foo) d(o/bar)
 #        \ /
-#         b   e(baz)  f(master)
+#         b   e(baz)  f(main)
 #          \__  |  __/
 #             \ | /
 #               a
 test_expect_success 'setup repository' '
 	test_commit a &&
+	git branch -M main &&
 	git checkout -b o/foo &&
 	test_commit b &&
 	test_commit c &&
@@ -51,7 +77,7 @@ test_expect_success 'setup repository' '
 	test_commit d &&
 	git checkout -b baz a &&
 	test_commit e &&
-	git checkout master &&
+	git checkout main &&
 	test_commit f
 '
 
@@ -72,15 +98,11 @@ test_expect_success 'config controls ref-in-want advertisement' '
 '
 
 test_expect_success 'invalid want-ref line' '
-	test-tool pkt-line pack >in <<-EOF &&
-	$(write_command fetch)
-	0001
-	no-progress
+	write_fetch_command >pkt <<-EOF &&
 	want-ref refs/heads/non-existent
-	done
-	0000
 	EOF
 
+	test-tool pkt-line pack <pkt >in &&
 	test_must_fail test-tool serve-v2 --stateless-rpc 2>out <in &&
 	grep "unknown ref" out
 '
@@ -88,20 +110,15 @@ test_expect_success 'invalid want-ref line' '
 test_expect_success 'basic want-ref' '
 	oid=$(git rev-parse f) &&
 	cat >expected_refs <<-EOF &&
-	$oid refs/heads/master
+	$oid refs/heads/main
 	EOF
 	git rev-parse f >expected_commits &&
 
-	oid=$(git rev-parse a) &&
-	test-tool pkt-line pack >in <<-EOF &&
-	$(write_command fetch)
-	0001
-	no-progress
-	want-ref refs/heads/master
-	have $oid
-	done
-	0000
+	write_fetch_command >pkt <<-EOF &&
+	want-ref refs/heads/main
+	have $(git rev-parse a)
 	EOF
+	test-tool pkt-line pack <pkt >in &&
 
 	test-tool serve-v2 --stateless-rpc >out <in &&
 	check_output
@@ -116,17 +133,12 @@ test_expect_success 'multiple want-ref lines' '
 	EOF
 	git rev-parse c d >expected_commits &&
 
-	oid=$(git rev-parse b) &&
-	test-tool pkt-line pack >in <<-EOF &&
-	$(write_command fetch)
-	0001
-	no-progress
+	write_fetch_command >pkt <<-EOF &&
 	want-ref refs/heads/o/foo
 	want-ref refs/heads/o/bar
-	have $oid
-	done
-	0000
+	have $(git rev-parse b)
 	EOF
+	test-tool pkt-line pack <pkt >in &&
 
 	test-tool serve-v2 --stateless-rpc >out <in &&
 	check_output
@@ -135,20 +147,16 @@ test_expect_success 'multiple want-ref lines' '
 test_expect_success 'mix want and want-ref' '
 	oid=$(git rev-parse f) &&
 	cat >expected_refs <<-EOF &&
-	$oid refs/heads/master
+	$oid refs/heads/main
 	EOF
 	git rev-parse e f >expected_commits &&
 
-	test-tool pkt-line pack >in <<-EOF &&
-	$(write_command fetch)
-	0001
-	no-progress
-	want-ref refs/heads/master
+	write_fetch_command >pkt <<-EOF &&
+	want-ref refs/heads/main
 	want $(git rev-parse e)
 	have $(git rev-parse a)
-	done
-	0000
 	EOF
+	test-tool pkt-line pack <pkt >in &&
 
 	test-tool serve-v2 --stateless-rpc >out <in &&
 	check_output
@@ -161,16 +169,11 @@ test_expect_success 'want-ref with ref we already have commit for' '
 	EOF
 	>expected_commits &&
 
-	oid=$(git rev-parse c) &&
-	test-tool pkt-line pack >in <<-EOF &&
-	$(write_command fetch)
-	0001
-	no-progress
+	write_fetch_command >pkt <<-EOF &&
 	want-ref refs/heads/o/foo
-	have $oid
-	done
-	0000
+	have $(git rev-parse c)
 	EOF
+	test-tool pkt-line pack <pkt >in &&
 
 	test-tool serve-v2 --stateless-rpc >out <in &&
 	check_output
@@ -182,7 +185,7 @@ LOCAL_PRISTINE="$(pwd)/local_pristine"
 # $REPO
 # c(o/foo) d(o/bar)
 #        \ /
-#         b   e(baz)  f(master)
+#         b   e(baz)  f(main)
 #          \__  |  __/
 #             \ | /
 #               a
@@ -193,10 +196,10 @@ LOCAL_PRISTINE="$(pwd)/local_pristine"
 #		.
 #		.
 #		|
-#		a(master)
+#		a(main)
 test_expect_success 'setup repos for fetching with ref-in-want tests' '
 	(
-		git init "$REPO" &&
+		git init -b main "$REPO" &&
 		cd "$REPO" &&
 		test_commit a &&
 
@@ -209,7 +212,7 @@ test_expect_success 'setup repos for fetching with ref-in-want tests' '
 		test_commit_bulk --id=s 33 &&
 
 		# Add novel commits to upstream
-		git checkout master &&
+		git checkout main &&
 		cd "$REPO" &&
 		git checkout -b o/foo &&
 		test_commit b &&
@@ -218,7 +221,7 @@ test_expect_success 'setup repos for fetching with ref-in-want tests' '
 		test_commit d &&
 		git checkout -b baz a &&
 		test_commit e &&
-		git checkout master &&
+		git checkout main &&
 		test_commit f
 	) &&
 	git -C "$REPO" config uploadpack.allowRefInWant true &&
@@ -226,14 +229,16 @@ test_expect_success 'setup repos for fetching with ref-in-want tests' '
 '
 
 test_expect_success 'fetching with exact OID' '
-	test_when_finished "rm -f log" &&
+	test_when_finished "rm -f log trace2" &&
 
 	rm -rf local &&
 	cp -r "$LOCAL_PRISTINE" local &&
 	oid=$(git -C "$REPO" rev-parse d) &&
-	GIT_TRACE_PACKET="$(pwd)/log" git -C local fetch origin \
+	GIT_TRACE_PACKET="$(pwd)/log" GIT_TRACE2_EVENT="$(pwd)/trace2" \
+		git -C local fetch origin \
 		"$oid":refs/heads/actual &&
 
+	grep \"key\":\"total_rounds\",\"value\":\"2\" trace2 &&
 	git -C "$REPO" rev-parse "d" >expected &&
 	git -C local rev-parse refs/heads/actual >actual &&
 	test_cmp expected actual &&
@@ -245,12 +250,12 @@ test_expect_success 'fetching multiple refs' '
 
 	rm -rf local &&
 	cp -r "$LOCAL_PRISTINE" local &&
-	GIT_TRACE_PACKET="$(pwd)/log" git -C local fetch origin master baz &&
+	GIT_TRACE_PACKET="$(pwd)/log" git -C local fetch origin main baz &&
 
-	git -C "$REPO" rev-parse "master" "baz" >expected &&
-	git -C local rev-parse refs/remotes/origin/master refs/remotes/origin/baz >actual &&
+	git -C "$REPO" rev-parse "main" "baz" >expected &&
+	git -C local rev-parse refs/remotes/origin/main refs/remotes/origin/baz >actual &&
 	test_cmp expected actual &&
-	grep "want-ref refs/heads/master" log &&
+	grep "want-ref refs/heads/main" log &&
 	grep "want-ref refs/heads/baz" log
 '
 
@@ -261,13 +266,13 @@ test_expect_success 'fetching ref and exact OID' '
 	cp -r "$LOCAL_PRISTINE" local &&
 	oid=$(git -C "$REPO" rev-parse b) &&
 	GIT_TRACE_PACKET="$(pwd)/log" git -C local fetch origin \
-		master "$oid":refs/heads/actual &&
+		main "$oid":refs/heads/actual &&
 
-	git -C "$REPO" rev-parse "master" "b" >expected &&
-	git -C local rev-parse refs/remotes/origin/master refs/heads/actual >actual &&
+	git -C "$REPO" rev-parse "main" "b" >expected &&
+	git -C local rev-parse refs/remotes/origin/main refs/heads/actual >actual &&
 	test_cmp expected actual &&
 	grep "want $oid" log &&
-	grep "want-ref refs/heads/master" log
+	grep "want-ref refs/heads/main" log
 '
 
 test_expect_success 'fetching with wildcard that does not match any refs' '
@@ -293,6 +298,141 @@ test_expect_success 'fetching with wildcard that matches multiple refs' '
 	grep "want-ref refs/heads/o/bar" log
 '
 
+REPO="$(pwd)/repo-ns"
+
+test_expect_success 'setup namespaced repo' '
+	(
+		git init -b main "$REPO" &&
+		cd "$REPO" &&
+		test_commit a &&
+		test_commit b &&
+		git checkout a &&
+		test_commit c &&
+		git checkout a &&
+		test_commit d &&
+		git update-ref refs/heads/ns-no b &&
+		git update-ref refs/namespaces/ns/refs/heads/ns-yes c &&
+		git update-ref refs/namespaces/ns/refs/heads/hidden d
+	) &&
+	git -C "$REPO" config uploadpack.allowRefInWant true
+'
+
+test_expect_success 'with namespace: want-ref is considered relative to namespace' '
+	wanted_ref=refs/heads/ns-yes &&
+
+	oid=$(git -C "$REPO" rev-parse "refs/namespaces/ns/$wanted_ref") &&
+	cat >expected_refs <<-EOF &&
+	$oid $wanted_ref
+	EOF
+	cat >expected_commits <<-EOF &&
+	$oid
+	$(git -C "$REPO" rev-parse a)
+	EOF
+
+	write_fetch_command >pkt <<-EOF &&
+	want-ref $wanted_ref
+	EOF
+	test-tool pkt-line pack <pkt >in &&
+
+	GIT_NAMESPACE=ns test-tool -C "$REPO" serve-v2 --stateless-rpc >out <in &&
+	check_output
+'
+
+test_expect_success 'with namespace: want-ref outside namespace is unknown' '
+	wanted_ref=refs/heads/ns-no &&
+
+	write_fetch_command >pkt <<-EOF &&
+	want-ref $wanted_ref
+	EOF
+	test-tool pkt-line pack <pkt >in &&
+
+	test_must_fail env GIT_NAMESPACE=ns \
+		test-tool -C "$REPO" serve-v2 --stateless-rpc >out <in &&
+	grep "unknown ref" out
+'
+
+# Cross-check refs/heads/ns-no indeed exists
+test_expect_success 'without namespace: want-ref outside namespace succeeds' '
+	wanted_ref=refs/heads/ns-no &&
+
+	oid=$(git -C "$REPO" rev-parse $wanted_ref) &&
+	cat >expected_refs <<-EOF &&
+	$oid $wanted_ref
+	EOF
+	cat >expected_commits <<-EOF &&
+	$oid
+	$(git -C "$REPO" rev-parse a)
+	EOF
+
+	write_fetch_command >pkt <<-EOF &&
+	want-ref $wanted_ref
+	EOF
+	test-tool pkt-line pack <pkt >in &&
+
+	test-tool -C "$REPO" serve-v2 --stateless-rpc >out <in &&
+	check_output
+'
+
+test_expect_success 'with namespace: hideRefs is matched, relative to namespace' '
+	wanted_ref=refs/heads/hidden &&
+	git -C "$REPO" config transfer.hideRefs $wanted_ref &&
+
+	write_fetch_command >pkt <<-EOF &&
+	want-ref $wanted_ref
+	EOF
+	test-tool pkt-line pack <pkt >in &&
+
+	test_must_fail env GIT_NAMESPACE=ns \
+		test-tool -C "$REPO" serve-v2 --stateless-rpc >out <in &&
+	grep "unknown ref" out
+'
+
+# Cross-check refs/heads/hidden indeed exists
+test_expect_success 'with namespace: want-ref succeeds if hideRefs is removed' '
+	wanted_ref=refs/heads/hidden &&
+	git -C "$REPO" config --unset transfer.hideRefs $wanted_ref &&
+
+	oid=$(git -C "$REPO" rev-parse "refs/namespaces/ns/$wanted_ref") &&
+	cat >expected_refs <<-EOF &&
+	$oid $wanted_ref
+	EOF
+	cat >expected_commits <<-EOF &&
+	$oid
+	$(git -C "$REPO" rev-parse a)
+	EOF
+
+	write_fetch_command >pkt <<-EOF &&
+	want-ref $wanted_ref
+	EOF
+	test-tool pkt-line pack <pkt >in &&
+
+	GIT_NAMESPACE=ns test-tool -C "$REPO" serve-v2 --stateless-rpc >out <in &&
+	check_output
+'
+
+test_expect_success 'without namespace: relative hideRefs does not match' '
+	wanted_ref=refs/namespaces/ns/refs/heads/hidden &&
+	git -C "$REPO" config transfer.hideRefs refs/heads/hidden &&
+
+	oid=$(git -C "$REPO" rev-parse $wanted_ref) &&
+	cat >expected_refs <<-EOF &&
+	$oid $wanted_ref
+	EOF
+	cat >expected_commits <<-EOF &&
+	$oid
+	$(git -C "$REPO" rev-parse a)
+	EOF
+
+	write_fetch_command >pkt <<-EOF &&
+	want-ref $wanted_ref
+	EOF
+	test-tool pkt-line pack <pkt >in &&
+
+	test-tool -C "$REPO" serve-v2 --stateless-rpc >out <in &&
+	check_output
+'
+
+
 . "$TEST_DIRECTORY"/lib-httpd.sh
 start_httpd
 
@@ -301,7 +441,7 @@ LOCAL_PRISTINE="$(pwd)/local_pristine"
 
 test_expect_success 'setup repos for change-while-negotiating test' '
 	(
-		git init "$REPO" &&
+		git init -b main "$REPO" &&
 		cd "$REPO" &&
 		>.git/git-daemon-export-ok &&
 		test_commit m1 &&
@@ -316,7 +456,7 @@ test_expect_success 'setup repos for change-while-negotiating test' '
 		test_commit_bulk --id=s 33 &&
 
 		# Add novel commits to upstream
-		git checkout master &&
+		git checkout main &&
 		cd "$REPO" &&
 		test_commit m2 &&
 		test_commit m3 &&
@@ -342,20 +482,20 @@ test_expect_success 'server is initially ahead - no ref in want' '
 	git -C "$REPO" config uploadpack.allowRefInWant false &&
 	rm -rf local &&
 	cp -r "$LOCAL_PRISTINE" local &&
-	inconsistency master $(test_oid numeric) &&
+	inconsistency main $(test_oid numeric) &&
 	test_must_fail git -C local fetch 2>err &&
-	test_i18ngrep "fatal: remote error: upload-pack: not our ref" err
+	test_grep "fatal: remote error: upload-pack: not our ref" err
 '
 
 test_expect_success 'server is initially ahead - ref in want' '
 	git -C "$REPO" config uploadpack.allowRefInWant true &&
 	rm -rf local &&
 	cp -r "$LOCAL_PRISTINE" local &&
-	inconsistency master $(test_oid numeric) &&
+	inconsistency main $(test_oid numeric) &&
 	git -C local fetch &&
 
-	git -C "$REPO" rev-parse --verify master >expected &&
-	git -C local rev-parse --verify refs/remotes/origin/master >actual &&
+	git -C "$REPO" rev-parse --verify main >expected &&
+	git -C local rev-parse --verify refs/remotes/origin/main >actual &&
 	test_cmp expected actual
 '
 
@@ -363,11 +503,11 @@ test_expect_success 'server is initially behind - no ref in want' '
 	git -C "$REPO" config uploadpack.allowRefInWant false &&
 	rm -rf local &&
 	cp -r "$LOCAL_PRISTINE" local &&
-	inconsistency master "master^" &&
+	inconsistency main "main^" &&
 	git -C local fetch &&
 
-	git -C "$REPO" rev-parse --verify "master^" >expected &&
-	git -C local rev-parse --verify refs/remotes/origin/master >actual &&
+	git -C "$REPO" rev-parse --verify "main^" >expected &&
+	git -C local rev-parse --verify refs/remotes/origin/main >actual &&
 	test_cmp expected actual
 '
 
@@ -375,11 +515,11 @@ test_expect_success 'server is initially behind - ref in want' '
 	git -C "$REPO" config uploadpack.allowRefInWant true &&
 	rm -rf local &&
 	cp -r "$LOCAL_PRISTINE" local &&
-	inconsistency master "master^" &&
+	inconsistency main "main^" &&
 	git -C local fetch &&
 
-	git -C "$REPO" rev-parse --verify "master" >expected &&
-	git -C local rev-parse --verify refs/remotes/origin/master >actual &&
+	git -C "$REPO" rev-parse --verify "main" >expected &&
+	git -C local rev-parse --verify refs/remotes/origin/main >actual &&
 	test_cmp expected actual
 '
 
@@ -387,10 +527,10 @@ test_expect_success 'server loses a ref - ref in want' '
 	git -C "$REPO" config uploadpack.allowRefInWant true &&
 	rm -rf local &&
 	cp -r "$LOCAL_PRISTINE" local &&
-	echo "s/master/raster/" >"$HTTPD_ROOT_PATH/one-time-perl" &&
+	echo "s/main/rain/" >"$HTTPD_ROOT_PATH/one-time-perl" &&
 	test_must_fail git -C local fetch 2>err &&
 
-	test_i18ngrep "fatal: remote error: unknown ref refs/heads/raster" err
+	test_grep "fatal: remote error: unknown ref refs/heads/rain" err
 '
 
 # DO NOT add non-httpd-specific tests here, because the last part of this
diff --git a/t/t5704-protocol-violations.sh b/t/t5704-protocol-violations.sh
index 5c94194..11be64f 100755
--- a/t/t5704-protocol-violations.sh
+++ b/t/t5704-protocol-violations.sh
@@ -4,6 +4,8 @@ test_description='Test responses to violations of the network protocol. In most
 of these cases it will generally be acceptable for one side to break off
 communications if the other side says something unexpected. We are mostly
 making sure that we do not segfault or otherwise behave badly.'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'extra delim packet in v2 ls-refs args' '
@@ -16,7 +18,7 @@ test_expect_success 'extra delim packet in v2 ls-refs args' '
 	} >input &&
 	test_must_fail env GIT_PROTOCOL=version=2 \
 		git upload-pack . <input 2>err &&
-	test_i18ngrep "expected flush after ls-refs arguments" err
+	test_grep "expected flush after ls-refs arguments" err
 '
 
 test_expect_success 'extra delim packet in v2 fetch args' '
@@ -29,7 +31,22 @@ test_expect_success 'extra delim packet in v2 fetch args' '
 	} >input &&
 	test_must_fail env GIT_PROTOCOL=version=2 \
 		git upload-pack . <input 2>err &&
-	test_i18ngrep "expected flush after fetch arguments" err
+	test_grep "expected flush after fetch arguments" err
+'
+
+test_expect_success 'bogus symref in v0 capabilities' '
+	test_commit foo &&
+	oid=$(git rev-parse HEAD) &&
+	dst=refs/heads/foo &&
+	{
+		printf "%s HEAD\0symref object-format=%s symref=HEAD:%s\n" \
+			"$oid" "$GIT_DEFAULT_HASH" "$dst" |
+			test-tool pkt-line pack-raw-stdin &&
+		printf "0000"
+	} >input &&
+	git ls-remote --symref --upload-pack="cat input; read junk;:" . >actual &&
+	printf "ref: %s\tHEAD\n%s\tHEAD\n" "$dst" "$oid" >expect &&
+	test_cmp expect actual
 '
 
 test_done
diff --git a/t/t5705-session-id-in-capabilities.sh b/t/t5705-session-id-in-capabilities.sh
new file mode 100755
index 0000000..b8a722e
--- /dev/null
+++ b/t/t5705-session-id-in-capabilities.sh
@@ -0,0 +1,88 @@
+#!/bin/sh
+
+test_description='session ID in capabilities'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+REPO="$(pwd)/repo"
+LOCAL_PRISTINE="$(pwd)/local_pristine"
+
+test_expect_success 'setup repos for session ID capability tests' '
+	git init "$REPO" &&
+	test_commit -C "$REPO" a &&
+	git clone "file://$REPO" "$LOCAL_PRISTINE" &&
+	test_commit -C "$REPO" b
+'
+
+for PROTO in 0 1 2
+do
+	test_expect_success "session IDs not advertised by default (fetch v${PROTO})" '
+		test_when_finished "rm -rf local tr2-client-events tr2-server-events" &&
+		cp -r "$LOCAL_PRISTINE" local &&
+		GIT_TRACE2_EVENT="$(pwd)/tr2-client-events" \
+		git -c protocol.version=$PROTO -C local fetch \
+			--upload-pack "GIT_TRACE2_EVENT=\"$(pwd)/tr2-server-events\" git-upload-pack" \
+			origin &&
+		test -z "$(grep \"key\":\"server-sid\" tr2-client-events)" &&
+		test -z "$(grep \"key\":\"client-sid\" tr2-server-events)"
+	'
+
+	test_expect_success "session IDs not advertised by default (push v${PROTO})" '
+		test_when_finished "rm -rf local tr2-client-events tr2-server-events" &&
+		test_when_finished "git -C local push --delete origin new-branch" &&
+		cp -r "$LOCAL_PRISTINE" local &&
+		git -C local pull --no-rebase origin &&
+		GIT_TRACE2_EVENT="$(pwd)/tr2-client-events" \
+		git -c protocol.version=$PROTO -C local push \
+			--receive-pack "GIT_TRACE2_EVENT=\"$(pwd)/tr2-server-events\" git-receive-pack" \
+			origin HEAD:new-branch &&
+		test -z "$(grep \"key\":\"server-sid\" tr2-client-events)" &&
+		test -z "$(grep \"key\":\"client-sid\" tr2-server-events)"
+	'
+done
+
+test_expect_success 'enable SID advertisement' '
+	git -C "$REPO" config transfer.advertiseSID true &&
+	git -C "$LOCAL_PRISTINE" config transfer.advertiseSID true
+'
+
+for PROTO in 0 1 2
+do
+	test_expect_success "session IDs advertised (fetch v${PROTO})" '
+		test_when_finished "rm -rf local tr2-client-events tr2-server-events" &&
+		cp -r "$LOCAL_PRISTINE" local &&
+		GIT_TRACE2_EVENT="$(pwd)/tr2-client-events" \
+		git -c protocol.version=$PROTO -C local fetch \
+			--upload-pack "GIT_TRACE2_EVENT=\"$(pwd)/tr2-server-events\" git-upload-pack" \
+			origin &&
+		grep \"key\":\"server-sid\" tr2-client-events &&
+		grep \"key\":\"client-sid\" tr2-server-events
+	'
+
+	test_expect_success "session IDs advertised (push v${PROTO})" '
+		test_when_finished "rm -rf local tr2-client-events tr2-server-events" &&
+		test_when_finished "git -C local push --delete origin new-branch" &&
+		cp -r "$LOCAL_PRISTINE" local &&
+		git -C local pull --no-rebase origin &&
+		GIT_TRACE2_EVENT="$(pwd)/tr2-client-events" \
+		git -c protocol.version=$PROTO -C local push \
+			--receive-pack "GIT_TRACE2_EVENT=\"$(pwd)/tr2-server-events\" git-receive-pack" \
+			origin HEAD:new-branch &&
+		grep \"key\":\"server-sid\" tr2-client-events &&
+		grep \"key\":\"client-sid\" tr2-server-events
+	'
+
+	test_expect_success "client & server log negotiated version (v${PROTO})" '
+		test_when_finished "rm -rf local tr2-client-events tr2-server-events" &&
+		cp -r "$LOCAL_PRISTINE" local &&
+		GIT_TRACE2_EVENT="$(pwd)/tr2-client-events" \
+		git -c protocol.version=$PROTO -C local fetch \
+			--upload-pack "GIT_TRACE2_EVENT=\"$(pwd)/tr2-server-events\" git-upload-pack" \
+			origin &&
+		grep \"key\":\"negotiated-version\",\"value\":\"$PROTO\" tr2-client-events &&
+		grep \"key\":\"negotiated-version\",\"value\":\"$PROTO\" tr2-server-events
+	'
+done
+
+test_done
diff --git a/t/t5730-protocol-v2-bundle-uri-file.sh b/t/t5730-protocol-v2-bundle-uri-file.sh
new file mode 100755
index 0000000..37bdb72
--- /dev/null
+++ b/t/t5730-protocol-v2-bundle-uri-file.sh
@@ -0,0 +1,17 @@
+#!/bin/sh
+
+test_description="Test bundle-uri with protocol v2 and 'file://' transport"
+
+TEST_NO_CREATE_REPO=1
+
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+. ./test-lib.sh
+
+# Test protocol v2 with 'file://' transport
+#
+BUNDLE_URI_PROTOCOL=file
+. "$TEST_DIRECTORY"/lib-bundle-uri-protocol.sh
+
+test_done
diff --git a/t/t5731-protocol-v2-bundle-uri-git.sh b/t/t5731-protocol-v2-bundle-uri-git.sh
new file mode 100755
index 0000000..8add1b3
--- /dev/null
+++ b/t/t5731-protocol-v2-bundle-uri-git.sh
@@ -0,0 +1,17 @@
+#!/bin/sh
+
+test_description="Test bundle-uri with protocol v2 and 'git://' transport"
+
+TEST_NO_CREATE_REPO=1
+
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+. ./test-lib.sh
+
+# Test protocol v2 with 'git://' transport
+#
+BUNDLE_URI_PROTOCOL=git
+. "$TEST_DIRECTORY"/lib-bundle-uri-protocol.sh
+
+test_done
diff --git a/t/t5732-protocol-v2-bundle-uri-http.sh b/t/t5732-protocol-v2-bundle-uri-http.sh
new file mode 100755
index 0000000..129daa0
--- /dev/null
+++ b/t/t5732-protocol-v2-bundle-uri-http.sh
@@ -0,0 +1,17 @@
+#!/bin/sh
+
+test_description="Test bundle-uri with protocol v2 and 'http://' transport"
+
+TEST_NO_CREATE_REPO=1
+
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+. ./test-lib.sh
+
+# Test protocol v2 with 'http://' transport
+#
+BUNDLE_URI_PROTOCOL=http
+. "$TEST_DIRECTORY"/lib-bundle-uri-protocol.sh
+
+test_done
diff --git a/t/t5750-bundle-uri-parse.sh b/t/t5750-bundle-uri-parse.sh
new file mode 100755
index 0000000..81bdf58
--- /dev/null
+++ b/t/t5750-bundle-uri-parse.sh
@@ -0,0 +1,290 @@
+#!/bin/sh
+
+test_description="Test bundle-uri bundle_uri_parse_line()"
+
+TEST_NO_CREATE_REPO=1
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+test_expect_success 'bundle_uri_parse_line() just URIs' '
+	cat >in <<-\EOF &&
+	bundle.one.uri=http://example.com/bundle.bdl
+	bundle.two.uri=https://example.com/bundle.bdl
+	bundle.three.uri=file:///usr/share/git/bundle.bdl
+	EOF
+
+	cat >expect <<-\EOF &&
+	[bundle]
+		version = 1
+		mode = all
+	[bundle "one"]
+		uri = http://example.com/bundle.bdl
+	[bundle "two"]
+		uri = https://example.com/bundle.bdl
+	[bundle "three"]
+		uri = file:///usr/share/git/bundle.bdl
+	EOF
+
+	test-tool bundle-uri parse-key-values in >actual 2>err &&
+	test_must_be_empty err &&
+	test_cmp_config_output expect actual
+'
+
+test_expect_success 'bundle_uri_parse_line(): relative URIs' '
+	cat >in <<-\EOF &&
+	bundle.one.uri=bundle.bdl
+	bundle.two.uri=../bundle.bdl
+	bundle.three.uri=sub/dir/bundle.bdl
+	EOF
+
+	cat >expect <<-\EOF &&
+	[bundle]
+		version = 1
+		mode = all
+	[bundle "one"]
+		uri = <uri>/bundle.bdl
+	[bundle "two"]
+		uri = bundle.bdl
+	[bundle "three"]
+		uri = <uri>/sub/dir/bundle.bdl
+	EOF
+
+	test-tool bundle-uri parse-key-values in >actual 2>err &&
+	test_must_be_empty err &&
+	test_cmp_config_output expect actual
+'
+
+test_expect_success 'bundle_uri_parse_line(): relative URIs and parent paths' '
+	cat >in <<-\EOF &&
+	bundle.one.uri=bundle.bdl
+	bundle.two.uri=../bundle.bdl
+	bundle.three.uri=../../bundle.bdl
+	EOF
+
+	cat >expect <<-\EOF &&
+	[bundle]
+		version = 1
+		mode = all
+	[bundle "one"]
+		uri = <uri>/bundle.bdl
+	[bundle "two"]
+		uri = bundle.bdl
+	[bundle "three"]
+		uri = <uri>/../bundle.bdl
+	EOF
+
+	# TODO: We would prefer if parsing a bundle list would not cause
+	# a die() and instead would give a warning and allow the rest of
+	# a Git command to continue. This test_must_fail is necessary for
+	# now until the interface for relative_url() allows for reporting
+	# an error instead of die()ing.
+	test_must_fail test-tool bundle-uri parse-key-values in >actual 2>err &&
+	grep "fatal: cannot strip one component off url" err
+'
+
+test_expect_success 'bundle_uri_parse_line() parsing edge cases: empty key or value' '
+	cat >in <<-\EOF &&
+	=bogus-value
+	bogus-key=
+	EOF
+
+	cat >err.expect <<-EOF &&
+	error: bundle-uri: line has empty key or value
+	error: bad line: '\''=bogus-value'\''
+	error: bundle-uri: line has empty key or value
+	error: bad line: '\''bogus-key='\''
+	EOF
+
+	cat >expect <<-\EOF &&
+	[bundle]
+		version = 1
+		mode = all
+	EOF
+
+	test_must_fail test-tool bundle-uri parse-key-values in >actual 2>err &&
+	test_cmp err.expect err &&
+	test_cmp_config_output expect actual
+'
+
+test_expect_success 'bundle_uri_parse_line() parsing edge cases: empty lines' '
+	cat >in <<-\EOF &&
+	bundle.one.uri=http://example.com/bundle.bdl
+
+	bundle.two.uri=https://example.com/bundle.bdl
+
+	bundle.three.uri=file:///usr/share/git/bundle.bdl
+	EOF
+
+	cat >err.expect <<-\EOF &&
+	error: bundle-uri: got an empty line
+	error: bad line: '\'''\''
+	error: bundle-uri: got an empty line
+	error: bad line: '\'''\''
+	EOF
+
+	# We fail, but try to continue parsing regardless
+	cat >expect <<-\EOF &&
+	[bundle]
+		version = 1
+		mode = all
+	[bundle "one"]
+		uri = http://example.com/bundle.bdl
+	[bundle "two"]
+		uri = https://example.com/bundle.bdl
+	[bundle "three"]
+		uri = file:///usr/share/git/bundle.bdl
+	EOF
+
+	test_must_fail test-tool bundle-uri parse-key-values in >actual 2>err &&
+	test_cmp err.expect err &&
+	test_cmp_config_output expect actual
+'
+
+test_expect_success 'bundle_uri_parse_line() parsing edge cases: duplicate lines' '
+	cat >in <<-\EOF &&
+	bundle.one.uri=http://example.com/bundle.bdl
+	bundle.two.uri=https://example.com/bundle.bdl
+	bundle.one.uri=https://example.com/bundle-2.bdl
+	bundle.three.uri=file:///usr/share/git/bundle.bdl
+	EOF
+
+	cat >err.expect <<-\EOF &&
+	error: bad line: '\''bundle.one.uri=https://example.com/bundle-2.bdl'\''
+	EOF
+
+	# We fail, but try to continue parsing regardless
+	cat >expect <<-\EOF &&
+	[bundle]
+		version = 1
+		mode = all
+	[bundle "one"]
+		uri = http://example.com/bundle.bdl
+	[bundle "two"]
+		uri = https://example.com/bundle.bdl
+	[bundle "three"]
+		uri = file:///usr/share/git/bundle.bdl
+	EOF
+
+	test_must_fail test-tool bundle-uri parse-key-values in >actual 2>err &&
+	test_cmp err.expect err &&
+	test_cmp_config_output expect actual
+'
+
+test_expect_success 'parse config format: just URIs' '
+	cat >expect <<-\EOF &&
+	[bundle]
+		version = 1
+		mode = all
+	[bundle "one"]
+		uri = http://example.com/bundle.bdl
+	[bundle "two"]
+		uri = https://example.com/bundle.bdl
+	[bundle "three"]
+		uri = file:///usr/share/git/bundle.bdl
+	EOF
+
+	test-tool bundle-uri parse-config expect >actual 2>err &&
+	test_must_be_empty err &&
+	test_cmp_config_output expect actual
+'
+
+test_expect_success 'parse config format: relative URIs' '
+	cat >in <<-\EOF &&
+	[bundle]
+		version = 1
+		mode = all
+	[bundle "one"]
+		uri = bundle.bdl
+	[bundle "two"]
+		uri = ../bundle.bdl
+	[bundle "three"]
+		uri = sub/dir/bundle.bdl
+	EOF
+
+	cat >expect <<-\EOF &&
+	[bundle]
+		version = 1
+		mode = all
+	[bundle "one"]
+		uri = <uri>/bundle.bdl
+	[bundle "two"]
+		uri = bundle.bdl
+	[bundle "three"]
+		uri = <uri>/sub/dir/bundle.bdl
+	EOF
+
+	test-tool bundle-uri parse-config in >actual 2>err &&
+	test_must_be_empty err &&
+	test_cmp_config_output expect actual
+'
+
+test_expect_success 'parse config format edge cases: empty key or value' '
+	cat >in1 <<-\EOF &&
+	= bogus-value
+	EOF
+
+	cat >err1 <<-EOF &&
+	error: bad config line 1 in file in1
+	EOF
+
+	cat >expect <<-\EOF &&
+	[bundle]
+		version = 1
+		mode = all
+	EOF
+
+	test_must_fail test-tool bundle-uri parse-config in1 >actual 2>err &&
+	test_cmp err1 err &&
+	test_cmp_config_output expect actual &&
+
+	cat >in2 <<-\EOF &&
+	bogus-key =
+	EOF
+
+	cat >err2 <<-EOF &&
+	error: bad config line 1 in file in2
+	EOF
+
+	test_must_fail test-tool bundle-uri parse-config in2 >actual 2>err &&
+	test_cmp err2 err &&
+	test_cmp_config_output expect actual
+'
+
+test_expect_success 'parse config format: creationToken heuristic' '
+	cat >expect <<-\EOF &&
+	[bundle]
+		version = 1
+		mode = all
+		heuristic = creationToken
+	[bundle "one"]
+		uri = http://example.com/bundle.bdl
+		creationToken = 123456
+	[bundle "two"]
+		uri = https://example.com/bundle.bdl
+		creationToken = 12345678901234567890
+	[bundle "three"]
+		uri = file:///usr/share/git/bundle.bdl
+		creationToken = 1
+	EOF
+
+	test-tool bundle-uri parse-config expect >actual 2>err &&
+	test_must_be_empty err &&
+	test_cmp_config_output expect actual
+'
+
+test_expect_success 'parse config format edge cases: creationToken heuristic' '
+	cat >expect <<-\EOF &&
+	[bundle]
+		version = 1
+		mode = all
+		heuristic = creationToken
+	[bundle "one"]
+		uri = http://example.com/bundle.bdl
+		creationToken = bogus
+	EOF
+
+	test-tool bundle-uri parse-config expect >actual 2>err &&
+	grep "could not parse bundle list key creationToken with value '\''bogus'\''" err
+'
+
+test_done
diff --git a/t/t5801-remote-helpers.sh b/t/t5801-remote-helpers.sh
index 0f04b6c..4e0a77f 100755
--- a/t/t5801-remote-helpers.sh
+++ b/t/t5801-remote-helpers.sh
@@ -5,6 +5,9 @@
 
 test_description='Test remote-helper import and export commands'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-gpg.sh
 
@@ -71,18 +74,18 @@ test_expect_success 'fetch multiple branches' '
 	(cd local &&
 	 git fetch
 	) &&
-	compare_refs server master local refs/remotes/origin/master &&
+	compare_refs server main local refs/remotes/origin/main &&
 	compare_refs server new local refs/remotes/origin/new
 '
 
 test_expect_success 'push when remote has extra refs' '
 	(cd local &&
-	 git reset --hard origin/master &&
+	 git reset --hard origin/main &&
 	 echo content >>file &&
 	 git commit -a -m six &&
 	 git push
 	) &&
-	compare_refs local master server master
+	compare_refs local main server main
 '
 
 test_expect_success 'push new branch by name' '
@@ -134,7 +137,7 @@ test_expect_success 'forced push' '
 test_expect_success 'cloning without refspec' '
 	GIT_REMOTE_TESTGIT_NOREFSPEC=1 \
 	git clone "testgit::${PWD}/server" local2 2>error &&
-	test_i18ngrep "this remote helper should implement refspec capability" error &&
+	test_grep "this remote helper should implement refspec capability" error &&
 	compare_refs local2 HEAD server HEAD
 '
 
@@ -142,7 +145,7 @@ test_expect_success 'pulling without refspecs' '
 	(cd local2 &&
 	git reset --hard &&
 	GIT_REMOTE_TESTGIT_NOREFSPEC=1 git pull 2>../error) &&
-	test_i18ngrep "this remote helper should implement refspec capability" error &&
+	test_grep "this remote helper should implement refspec capability" error &&
 	compare_refs local2 HEAD server HEAD
 '
 
@@ -154,7 +157,7 @@ test_expect_success 'pushing without refspecs' '
 	GIT_REMOTE_TESTGIT_NOREFSPEC=1 &&
 	export GIT_REMOTE_TESTGIT_NOREFSPEC &&
 	test_must_fail git push 2>../error) &&
-	test_i18ngrep "remote-helper doesn.t support push; refspec needed" error
+	test_grep "remote-helper doesn.t support push; refspec needed" error
 '
 
 test_expect_success 'pulling without marks' '
@@ -174,7 +177,7 @@ test_expect_failure 'pushing without marks' '
 
 test_expect_success 'push all with existing object' '
 	(cd local &&
-	git branch dup2 master &&
+	git branch dup2 main &&
 	git push origin --all
 	) &&
 	compare_refs local dup2 server dup2
@@ -182,7 +185,7 @@ test_expect_success 'push all with existing object' '
 
 test_expect_success 'push ref with existing object' '
 	(cd local &&
-	git branch dup master &&
+	git branch dup main &&
 	git push origin dup
 	) &&
 	compare_refs local dup server dup
@@ -190,7 +193,7 @@ test_expect_success 'push ref with existing object' '
 
 test_expect_success GPG 'push signed tag' '
 	(cd local &&
-	git checkout master &&
+	git checkout main &&
 	git tag -s -m signed-tag signed-tag &&
 	git push origin signed-tag
 	) &&
@@ -200,7 +203,7 @@ test_expect_success GPG 'push signed tag' '
 
 test_expect_success GPG 'push signed tag with signed-tags capability' '
 	(cd local &&
-	git checkout master &&
+	git checkout main &&
 	git tag -s -m signed-tag signed-tag-2 &&
 	GIT_REMOTE_TESTGIT_SIGNED_TAGS=1 git push origin signed-tag-2
 	) &&
@@ -209,7 +212,7 @@ test_expect_success GPG 'push signed tag with signed-tags capability' '
 
 test_expect_success 'push update refs' '
 	(cd local &&
-	git checkout -b update master &&
+	git checkout -b update main &&
 	echo update >>file &&
 	git commit -a -m update &&
 	git push origin update &&
@@ -253,14 +256,14 @@ clean_mark () {
 test_expect_success 'proper failure checks for fetching' '
 	(cd local &&
 	test_must_fail env GIT_REMOTE_TESTGIT_FAILURE=1 git fetch 2>error &&
-	test_i18ngrep -q "error while running fast-import" error
+	test_grep -q "error while running fast-import" error
 	)
 '
 
 test_expect_success 'proper failure checks for pushing' '
 	test_when_finished "rm -rf local/git.marks local/testgit.marks" &&
 	(cd local &&
-	git checkout -b crash master &&
+	git checkout -b crash main &&
 	echo crash >>file &&
 	git commit -a -m crash &&
 	test_must_fail env GIT_REMOTE_TESTGIT_FAILURE=1 git push --all &&
@@ -272,7 +275,7 @@ test_expect_success 'proper failure checks for pushing' '
 
 test_expect_success 'push messages' '
 	(cd local &&
-	git checkout -b new_branch master &&
+	git checkout -b new_branch main &&
 	echo new >>file &&
 	git commit -a -m new &&
 	git push origin new_branch &&
@@ -286,7 +289,7 @@ test_expect_success 'push messages' '
 
 test_expect_success 'fetch HEAD' '
 	(cd server &&
-	git checkout master &&
+	git checkout main &&
 	echo more >>file &&
 	git commit -a -m more
 	) &&
@@ -298,7 +301,7 @@ test_expect_success 'fetch HEAD' '
 
 test_expect_success 'fetch url' '
 	(cd server &&
-	git checkout master &&
+	git checkout main &&
 	echo more >>file &&
 	git commit -a -m more
 	) &&
diff --git a/t/t5801/git-remote-testgit b/t/t5801/git-remote-testgit
index 1544d6d..c5b10f5 100755
--- a/t/t5801/git-remote-testgit
+++ b/t/t5801/git-remote-testgit
@@ -12,6 +12,11 @@ url=$2
 
 dir="$GIT_DIR/testgit/$alias"
 
+if ! git rev-parse --is-inside-git-dir
+then
+	exit 1
+fi
+
 h_refspec="refs/heads/*:refs/testgit/$alias/heads/*"
 t_refspec="refs/tags/*:refs/testgit/$alias/tags/*"
 
@@ -25,6 +30,7 @@ GIT_DIR="$url/.git"
 export GIT_DIR
 
 force=
+object_format=
 
 mkdir -p "$dir"
 
@@ -56,7 +62,8 @@ do
 		echo
 		;;
 	list)
-		echo ":object-format $(git rev-parse --show-object-format=storage)"
+		test -n "$object_format" &&
+			echo ":object-format $(git rev-parse --show-object-format=storage)"
 		git for-each-ref --format='? %(refname)' 'refs/heads/' 'refs/tags/'
 		head=$(git symbolic-ref HEAD)
 		echo "@$head HEAD"
diff --git a/t/t5810-proto-disable-local.sh b/t/t5810-proto-disable-local.sh
index c1ef99b..8626102 100755
--- a/t/t5810-proto-disable-local.sh
+++ b/t/t5810-proto-disable-local.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='test disabling of local paths in clone/fetch'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY/lib-proto-disable.sh"
 
diff --git a/t/t5811-proto-disable-git.sh b/t/t5811-proto-disable-git.sh
index 8ac6b2a..ed773e7 100755
--- a/t/t5811-proto-disable-git.sh
+++ b/t/t5811-proto-disable-git.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='test disabling of git-over-tcp in clone/fetch'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY/lib-proto-disable.sh"
 . "$TEST_DIRECTORY/lib-git-daemon.sh"
diff --git a/t/t5812-proto-disable-http.sh b/t/t5812-proto-disable-http.sh
index af8772f..769c717 100755
--- a/t/t5812-proto-disable-http.sh
+++ b/t/t5812-proto-disable-http.sh
@@ -16,11 +16,11 @@ test_expect_success 'create git-accessible repo' '
 
 test_proto "smart http" http "$HTTPD_URL/smart/repo.git"
 
-test_expect_success 'curl redirects respect whitelist' '
+test_expect_success 'http(s) transport respects GIT_ALLOW_PROTOCOL' '
 	test_must_fail env GIT_ALLOW_PROTOCOL=http:https \
 			   GIT_SMART_HTTP=0 \
 		git clone "$HTTPD_URL/ftp-redir/repo.git" 2>stderr &&
-	test_i18ngrep -E "(ftp.*disabled|your curl version is too old)" stderr
+	test_grep -E "(ftp.*disabled|your curl version is too old)" stderr
 '
 
 test_expect_success 'curl limits redirects' '
diff --git a/t/t5813-proto-disable-ssh.sh b/t/t5813-proto-disable-ssh.sh
index 3f084ee..2e975dc 100755
--- a/t/t5813-proto-disable-ssh.sh
+++ b/t/t5813-proto-disable-ssh.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='test disabling of git-over-ssh in clone/fetch'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY/lib-proto-disable.sh"
 
diff --git a/t/t5815-submodule-protos.sh b/t/t5815-submodule-protos.sh
index 06f55a1..4d5956c 100755
--- a/t/t5815-submodule-protos.sh
+++ b/t/t5815-submodule-protos.sh
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-test_description='test protocol whitelisting with submodules'
+test_description='test protocol filtering with submodules'
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-proto-disable.sh
 
@@ -36,7 +36,7 @@ test_expect_success 'update of ext not allowed' '
 	test_must_fail git -C dst submodule update ext-module
 '
 
-test_expect_success 'user can override whitelist' '
+test_expect_success 'user can filter protocols with GIT_ALLOW_PROTOCOL' '
 	GIT_ALLOW_PROTOCOL=ext git -C dst submodule update ext-module
 '
 
diff --git a/t/t5900-repo-selection.sh b/t/t5900-repo-selection.sh
index 14e59c5..a84faac 100755
--- a/t/t5900-repo-selection.sh
+++ b/t/t5900-repo-selection.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='selecting remote repo in ambiguous cases'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 reset() {
diff --git a/t/t6000-rev-list-misc.sh b/t/t6000-rev-list-misc.sh
index 3bb0e4f..6289a2e 100755
--- a/t/t6000-rev-list-misc.sh
+++ b/t/t6000-rev-list-misc.sh
@@ -2,6 +2,9 @@
 
 test_description='miscellaneous rev-list tests'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -85,7 +88,7 @@ test_expect_success 'propagate uninteresting flag down correctly' '
 '
 
 test_expect_success 'symleft flag bit is propagated down from tag' '
-	git log --format="%m %s" --left-right v1.0...master >actual &&
+	git log --format="%m %s" --left-right v1.0...main >actual &&
 	cat >expect <<-\EOF &&
 	< another
 	< that
@@ -128,8 +131,8 @@ test_expect_success 'rev-list can negate index objects' '
 	test_cmp expect actual
 '
 
-test_expect_success '--bisect and --first-parent can not be combined' '
-	test_must_fail git rev-list --bisect --first-parent HEAD
+test_expect_success '--bisect and --first-parent can be combined' '
+	git rev-list --bisect --first-parent HEAD
 '
 
 test_expect_success '--header shows a NUL after each commit' '
@@ -166,4 +169,17 @@ test_expect_success 'rev-list --count --objects' '
 	test_line_count = $count actual
 '
 
+test_expect_success 'rev-list --unpacked' '
+	git repack -ad &&
+	test_commit unpacked &&
+
+	git rev-list --objects --no-object-names unpacked^.. >expect.raw &&
+	sort expect.raw >expect &&
+
+	git rev-list --all --objects --unpacked --no-object-names >actual.raw &&
+	sort actual.raw >actual &&
+
+	test_cmp expect actual
+'
+
 test_done
diff --git a/t/t6001-rev-list-graft.sh b/t/t6001-rev-list-graft.sh
index 7504ba4..73a2465 100755
--- a/t/t6001-rev-list-graft.sh
+++ b/t/t6001-rev-list-graft.sh
@@ -2,6 +2,9 @@
 
 test_description='Revision traversal vs grafts and path limiter'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -20,7 +23,8 @@ test_expect_success setup '
 	git commit -a -m "Third in one history." &&
 	A2=$(git rev-parse --verify HEAD) &&
 
-	rm -f .git/refs/heads/master .git/index &&
+	git update-ref -d refs/heads/main &&
+	rm -f .git/index &&
 
 	echo >fileA fileA again &&
 	echo >subdir/fileB fileB again &&
@@ -95,6 +99,7 @@ do
 	"
 
 	test_expect_success 'with grafts' "
+		mkdir -p .git/info &&
 		echo '$B0 $A2' >.git/info/grafts &&
 		check $type $B2 -- $B2 $B1 $B0 $A2 $A1 $A0
 	"
@@ -113,10 +118,10 @@ done
 
 test_expect_success 'show advice that grafts are deprecated' '
 	git show HEAD 2>err &&
-	test_i18ngrep "git replace" err &&
+	test_grep "git replace" err &&
 	test_config advice.graftFileDeprecated false &&
 	git show HEAD 2>err &&
-	test_i18ngrep ! "git replace" err
+	test_grep ! "git replace" err
 '
 
 test_done
diff --git a/t/t6002-rev-list-bisect.sh b/t/t6002-rev-list-bisect.sh
index a661408..162cf50 100755
--- a/t/t6002-rev-list-bisect.sh
+++ b/t/t6002-rev-list-bisect.sh
@@ -4,6 +4,7 @@
 #
 test_description='Tests git rev-list --bisect functionality'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-t6000.sh # t6xxx specific functions
 
@@ -263,4 +264,49 @@ test_expect_success 'rev-parse --bisect can default to good/bad refs' '
 	test_cmp expect.sorted actual.sorted
 '
 
+test_output_expect_success '--bisect --first-parent' 'git rev-list --bisect --first-parent E ^F' <<EOF
+e4
+EOF
+
+test_output_expect_success '--first-parent' 'git rev-list --first-parent E ^F' <<EOF
+E
+e1
+e2
+e3
+e4
+e5
+e6
+e7
+e8
+EOF
+
+test_output_expect_success '--bisect-vars --first-parent' 'git rev-list --bisect-vars --first-parent E ^F' <<EOF
+bisect_rev='e5'
+bisect_nr=4
+bisect_good=4
+bisect_bad=3
+bisect_all=9
+bisect_steps=2
+EOF
+
+test_expect_success '--bisect-all --first-parent' '
+	cat >expect.unsorted <<-EOF &&
+	$(git rev-parse E) (tag: E, dist=0)
+	$(git rev-parse e1) (tag: e1, dist=1)
+	$(git rev-parse e2) (tag: e2, dist=2)
+	$(git rev-parse e3) (tag: e3, dist=3)
+	$(git rev-parse e4) (tag: e4, dist=4)
+	$(git rev-parse e5) (tag: e5, dist=4)
+	$(git rev-parse e6) (tag: e6, dist=3)
+	$(git rev-parse e7) (tag: e7, dist=2)
+	$(git rev-parse e8) (tag: e8, dist=1)
+	EOF
+
+	# expect results to be ordered by distance (descending),
+	# commit hash (ascending)
+	sort -k4,4r -k1,1 expect.unsorted >expect &&
+	git rev-list --bisect-all --first-parent E ^F >actual &&
+	test_cmp expect actual
+'
+
 test_done
diff --git a/t/t6003-rev-list-topo-order.sh b/t/t6003-rev-list-topo-order.sh
index 24d1836..5cf2cee 100755
--- a/t/t6003-rev-list-topo-order.sh
+++ b/t/t6003-rev-list-topo-order.sh
@@ -5,6 +5,7 @@
 
 test_description='Tests git rev-list --topo-order functionality'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-t6000.sh # t6xxx specific functions
 
@@ -325,19 +326,16 @@ a2
 c3
 EOF
 
-#
-# this test fails on --topo-order - a fix is required
-#
-#test_output_expect_success '--max-age=c3, --topo-order' "git rev-list --topo-order --max-age=$(commit_date c3) l5" <<EOF
-#l5
-#l4
-#l3
-#a4
-#c3
-#b4
-#a3
-#a2
-#EOF
+test_output_expect_success '--max-age=c3, --topo-order' "git rev-list --topo-order --max-age=$(commit_date c3) l5" <<EOF
+l5
+l4
+l3
+a4
+c3
+b4
+a3
+a2
+EOF
 
 test_output_expect_success 'one specified head reachable from another a4, c3, --topo-order' "list_duplicates git rev-list --topo-order a4 c3" <<EOF
 EOF
diff --git a/t/t6004-rev-list-path-optim.sh b/t/t6004-rev-list-path-optim.sh
index 3e8c42e..cd4f420 100755
--- a/t/t6004-rev-list-path-optim.sh
+++ b/t/t6004-rev-list-path-optim.sh
@@ -4,7 +4,7 @@ test_description='git rev-list trivial path optimization test
 
    d/z1
    b0                             b1
-   o------------------------*----o master
+   o------------------------*----o main
   /                        /
  o---------o----o----o----o side
  a0        c0   c1   a1   c2
@@ -13,6 +13,9 @@ test_description='git rev-list trivial path optimization test
 
 '
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -55,18 +58,18 @@ test_expect_success 'further setup' '
 	git add c &&
 	test_tick &&
 	git commit -m "Side makes yet another irrelevant commit" &&
-	git checkout master &&
+	git checkout main &&
 	echo Another >b &&
 	echo Munged >d/z &&
 	git add b d/z &&
 	test_tick &&
-	git commit -m "Master touches b" &&
-	git tag master_b0 &&
+	git commit -m "Main touches b" &&
+	git tag main_b0 &&
 	git merge side &&
 	echo Touched >b &&
 	git add b &&
 	test_tick &&
-	git commit -m "Master touches b again"
+	git commit -m "Main touches b again"
 '
 
 test_expect_success 'path optimization 2' '
@@ -76,13 +79,13 @@ test_expect_success 'path optimization 2' '
 '
 
 test_expect_success 'pathspec with leading path' '
-	git rev-parse master^ master_b0 side_c0 initial >expected &&
+	git rev-parse main^ main_b0 side_c0 initial >expected &&
 	git rev-list HEAD -- d >actual &&
 	test_cmp expected actual
 '
 
 test_expect_success 'pathspec with glob (1)' '
-	git rev-parse master^ master_b0 side_c0 initial >expected &&
+	git rev-parse main^ main_b0 side_c0 initial >expected &&
 	git rev-list HEAD -- "d/*" >actual &&
 	test_cmp expected actual
 '
diff --git a/t/t6005-rev-list-count.sh b/t/t6005-rev-list-count.sh
index 0b64822..ee0306a 100755
--- a/t/t6005-rev-list-count.sh
+++ b/t/t6005-rev-list-count.sh
@@ -2,50 +2,65 @@
 
 test_description='git rev-list --max-count and --skip test'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
-    for n in 1 2 3 4 5 ; do \
-        echo $n > a ; \
-        git add a ; \
-        git commit -m "$n" ; \
+    for n in 1 2 3 4 5 ; do
+	echo $n > a &&
+	git add a &&
+	git commit -m "$n" || return 1
     done
 '
 
 test_expect_success 'no options' '
-    test $(git rev-list HEAD | wc -l) = 5
+	test_stdout_line_count = 5 git rev-list HEAD
 '
 
 test_expect_success '--max-count' '
-    test $(git rev-list HEAD --max-count=0 | wc -l) = 0 &&
-    test $(git rev-list HEAD --max-count=3 | wc -l) = 3 &&
-    test $(git rev-list HEAD --max-count=5 | wc -l) = 5 &&
-    test $(git rev-list HEAD --max-count=10 | wc -l) = 5
+	test_must_fail git rev-list --max-count=1q HEAD 2>error &&
+	grep "not an integer" error &&
+
+	test_stdout_line_count = 0 git rev-list HEAD --max-count=0 &&
+	test_stdout_line_count = 3 git rev-list HEAD --max-count=3 &&
+	test_stdout_line_count = 5 git rev-list HEAD --max-count=5 &&
+	test_stdout_line_count = 5 git rev-list HEAD --max-count=10 &&
+	test_stdout_line_count = 5 git rev-list HEAD --max-count=-1
 '
 
 test_expect_success '--max-count all forms' '
-    test $(git rev-list HEAD --max-count=1 | wc -l) = 1 &&
-    test $(git rev-list HEAD -1 | wc -l) = 1 &&
-    test $(git rev-list HEAD -n1 | wc -l) = 1 &&
-    test $(git rev-list HEAD -n 1 | wc -l) = 1
+	test_must_fail git rev-list -1q HEAD 2>error &&
+	grep "not an integer" error &&
+	test_must_fail git rev-list --1 HEAD &&
+	test_must_fail git rev-list -n 1q HEAD 2>error &&
+	grep "not an integer" error &&
+
+	test_stdout_line_count = 1 git rev-list HEAD --max-count=1 &&
+	test_stdout_line_count = 1 git rev-list HEAD -1 &&
+	test_stdout_line_count = 1 git rev-list HEAD -n1 &&
+	test_stdout_line_count = 1 git rev-list HEAD -n 1 &&
+	test_stdout_line_count = 5 git rev-list HEAD -n -1
 '
 
 test_expect_success '--skip' '
-    test $(git rev-list HEAD --skip=0 | wc -l) = 5 &&
-    test $(git rev-list HEAD --skip=3 | wc -l) = 2 &&
-    test $(git rev-list HEAD --skip=5 | wc -l) = 0 &&
-    test $(git rev-list HEAD --skip=10 | wc -l) = 0
+	test_must_fail git rev-list --skip 1q HEAD 2>error &&
+	grep "not an integer" error &&
+
+	test_stdout_line_count = 5 git rev-list HEAD --skip=0 &&
+	test_stdout_line_count = 2 git rev-list HEAD --skip=3 &&
+	test_stdout_line_count = 0 git rev-list HEAD --skip=5 &&
+	test_stdout_line_count = 0 git rev-list HEAD --skip=10
 '
 
 test_expect_success '--skip --max-count' '
-    test $(git rev-list HEAD --skip=0 --max-count=0 | wc -l) = 0 &&
-    test $(git rev-list HEAD --skip=0 --max-count=10 | wc -l) = 5 &&
-    test $(git rev-list HEAD --skip=3 --max-count=0 | wc -l) = 0 &&
-    test $(git rev-list HEAD --skip=3 --max-count=1 | wc -l) = 1 &&
-    test $(git rev-list HEAD --skip=3 --max-count=2 | wc -l) = 2 &&
-    test $(git rev-list HEAD --skip=3 --max-count=10 | wc -l) = 2 &&
-    test $(git rev-list HEAD --skip=5 --max-count=10 | wc -l) = 0 &&
-    test $(git rev-list HEAD --skip=10 --max-count=10 | wc -l) = 0
+	test_stdout_line_count = 0 git rev-list HEAD --skip=0 --max-count=0 &&
+	test_stdout_line_count = 5 git rev-list HEAD --skip=0 --max-count=10 &&
+	test_stdout_line_count = 0 git rev-list HEAD --skip=3 --max-count=0 &&
+	test_stdout_line_count = 1 git rev-list HEAD --skip=3 --max-count=1 &&
+	test_stdout_line_count = 2 git rev-list HEAD --skip=3 --max-count=2 &&
+	test_stdout_line_count = 2 git rev-list HEAD --skip=3 --max-count=10 &&
+	test_stdout_line_count = 0 git rev-list HEAD --skip=5 --max-count=10 &&
+	test_stdout_line_count = 0 git rev-list HEAD --skip=10 --max-count=10
 '
 
 test_done
diff --git a/t/t6006-rev-list-format.sh b/t/t6006-rev-list-format.sh
index bc95da8..573eb97 100755
--- a/t/t6006-rev-list-format.sh
+++ b/t/t6006-rev-list-format.sh
@@ -5,6 +5,9 @@
 
 test_description='git rev-list --pretty=format test'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-terminal.sh
 
@@ -38,22 +41,59 @@ test_expect_success 'setup' '
 	echo "$added_iso88591" | git commit -F - &&
 	head1=$(git rev-parse --verify HEAD) &&
 	head1_short=$(git rev-parse --verify --short $head1) &&
+	head1_short4=$(git rev-parse --verify --short=4 $head1) &&
 	tree1=$(git rev-parse --verify HEAD:) &&
 	tree1_short=$(git rev-parse --verify --short $tree1) &&
 	echo "$changed" > foo &&
 	echo "$changed_iso88591" | git commit -a -F - &&
 	head2=$(git rev-parse --verify HEAD) &&
 	head2_short=$(git rev-parse --verify --short $head2) &&
+	head2_short4=$(git rev-parse --verify --short=4 $head2) &&
 	tree2=$(git rev-parse --verify HEAD:) &&
 	tree2_short=$(git rev-parse --verify --short $tree2) &&
 	git config --unset i18n.commitEncoding
 '
 
-# usage: test_format name format_string [failure] <expected_output
+# usage: test_format [argument...] name format_string [failure] <expected_output
 test_format () {
+	local args=
+	while true
+	do
+		case "$1" in
+		--*)
+			args="$args $1"
+			shift;;
+		*)
+			break;;
+		esac
+	done
 	cat >expect.$1
 	test_expect_${3:-success} "format $1" "
-		git rev-list --pretty=format:'$2' master >output.$1 &&
+		git rev-list $args --pretty=format:'$2' main >output.$1 &&
+		test_cmp expect.$1 output.$1
+	"
+}
+
+# usage: test_pretty [argument...] name format_name [failure] <expected_output
+test_pretty () {
+	local args=
+	while true
+	do
+		case "$1" in
+		--*)
+			args="$args $1"
+			shift;;
+		*)
+			break;;
+		esac
+	done
+	cat >expect.$1
+	test_expect_${3:-success} "pretty $1 (without --no-commit-header)" "
+		git rev-list $args --pretty='$2' main >output.$1 &&
+		test_cmp expect.$1 output.$1
+	"
+	test_expect_${3:-success} "pretty $1 (with --no-commit-header)" "
+		git rev-list $args --no-commit-header --pretty='$2' main >output.$1 &&
 		test_cmp expect.$1 output.$1
 	"
 }
@@ -90,6 +130,20 @@ $head1
 $head1_short
 EOF
 
+test_format --no-commit-header hash-no-header %H%n%h <<EOF
+$head2
+$head2_short
+$head1
+$head1_short
+EOF
+
+test_format --abbrev-commit --abbrev=0 --no-commit-header hash-no-header-abbrev %H%n%h <<EOF
+$head2
+$head2_short4
+$head1
+$head1_short4
+EOF
+
 test_format tree %T%n%t <<EOF
 commit $head2
 $tree2
@@ -178,19 +232,44 @@ $added
 
 EOF
 
+test_format --no-commit-header raw-body-no-header %B <<EOF
+$changed
+
+$added
+
+EOF
+
+test_pretty oneline oneline <<EOF
+$head2 $changed
+$head1 $added
+EOF
+
+test_pretty short short <<EOF
+commit $head2
+Author: $GIT_AUTHOR_NAME <$GIT_AUTHOR_EMAIL>
+
+    $changed
+
+commit $head1
+Author: $GIT_AUTHOR_NAME <$GIT_AUTHOR_EMAIL>
+
+    $added
+
+EOF
+
 test_expect_success 'basic colors' '
 	cat >expect <<-EOF &&
 	commit $head2
 	<RED>foo<GREEN>bar<BLUE>baz<RESET>xyzzy
 	EOF
 	format="%Credfoo%Cgreenbar%Cbluebaz%Cresetxyzzy" &&
-	git rev-list --color --format="$format" -1 master >actual.raw &&
+	git rev-list --color --format="$format" -1 main >actual.raw &&
 	test_decode_color <actual.raw >actual &&
 	test_cmp expect actual
 '
 
 test_expect_success '%S is not a placeholder for rev-list yet' '
-	git rev-list --format="%S" -1 master | grep "%S"
+	git rev-list --format="%S" -1 main | grep "%S"
 '
 
 test_expect_success 'advanced colors' '
@@ -199,7 +278,7 @@ test_expect_success 'advanced colors' '
 	<BOLD;RED;BYELLOW>foo<RESET>
 	EOF
 	format="%C(red yellow bold)foo%C(reset)" &&
-	git rev-list --color --format="$format" -1 master >actual.raw &&
+	git rev-list --color --format="$format" -1 main >actual.raw &&
 	test_decode_color <actual.raw >actual &&
 	test_cmp expect actual
 '
@@ -339,7 +418,7 @@ commit $head1
 .. (hinzugef${added_utf8_part_iso88591}gt) foo
 EOF
 
-test_expect_success 'prepare expected messages (for test %b)' '
+test_expect_success 'setup expected messages (for test %b)' '
 	cat <<-EOF >expected.utf-8 &&
 	commit $head3
 	This commit message is much longer than the others,
@@ -406,7 +485,7 @@ test_expect_success '%x00 shows NUL' '
 
 test_expect_success '%ad respects --date=' '
 	echo 2005-04-07 >expect.ad-short &&
-	git log -1 --date=short --pretty=tformat:%ad >output.ad-short master &&
+	git log -1 --date=short --pretty=tformat:%ad >output.ad-short main &&
 	test_cmp expect.ad-short output.ad-short
 '
 
@@ -414,7 +493,7 @@ test_expect_success 'empty email' '
 	test_tick &&
 	C=$(GIT_AUTHOR_EMAIL= git commit-tree HEAD^{tree} </dev/null) &&
 	A=$(git show --pretty=format:%an,%ae,%ad%n -s $C) &&
-	verbose test "$A" = "$GIT_AUTHOR_NAME,,Thu Apr 7 15:14:13 2005 -0700"
+	test "$A" = "$GIT_AUTHOR_NAME,,Thu Apr 7 15:14:13 2005 -0700"
 '
 
 test_expect_success 'del LF before empty (1)' '
@@ -494,8 +573,8 @@ test_expect_success '"%h %gD: %gs" is same as git-reflog (with --abbrev)' '
 '
 
 test_expect_success '%gd shortens ref name' '
-	echo "master@{0}" >expect.gd-short &&
-	git log -g -1 --format=%gd refs/heads/master >actual.gd-short &&
+	echo "main@{0}" >expect.gd-short &&
+	git log -g -1 --format=%gd refs/heads/main >actual.gd-short &&
 	test_cmp expect.gd-short actual.gd-short
 '
 
diff --git a/t/t6007-rev-list-cherry-pick-file.sh b/t/t6007-rev-list-cherry-pick-file.sh
index f026837..6f3e543 100755
--- a/t/t6007-rev-list-cherry-pick-file.sh
+++ b/t/t6007-rev-list-cherry-pick-file.sh
@@ -2,6 +2,9 @@
 
 test_description='test git rev-list --cherry-pick -- file'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 # A---B---D---F
@@ -31,7 +34,7 @@ test_expect_success setup '
 	test_tick &&
 	git commit -m "E" &&
 	git tag E &&
-	git checkout master &&
+	git checkout main &&
 	git checkout branch foo &&
 	test_tick &&
 	git commit -m "B" &&
@@ -55,7 +58,7 @@ EOF
 
 test_expect_success '--left-right' '
 	git rev-list --left-right B...C > actual &&
-	git name-rev --stdin --name-only --refs="*tags/*" \
+	git name-rev --annotate-stdin --name-only --refs="*tags/*" \
 		< actual > actual.named &&
 	test_cmp expect actual.named
 '
@@ -75,14 +78,14 @@ EOF
 
 test_expect_success '--cherry-pick bar does not come up empty' '
 	git rev-list --left-right --cherry-pick B...C -- bar > actual &&
-	git name-rev --stdin --name-only --refs="*tags/*" \
+	git name-rev --annotate-stdin --name-only --refs="*tags/*" \
 		< actual > actual.named &&
 	test_cmp expect actual.named
 '
 
 test_expect_success 'bar does not come up empty' '
 	git rev-list --left-right B...C -- bar > actual &&
-	git name-rev --stdin --name-only --refs="*tags/*" \
+	git name-rev --annotate-stdin --name-only --refs="*tags/*" \
 		< actual > actual.named &&
 	test_cmp expect actual.named
 '
@@ -94,14 +97,14 @@ EOF
 
 test_expect_success '--cherry-pick bar does not come up empty (II)' '
 	git rev-list --left-right --cherry-pick F...E -- bar > actual &&
-	git name-rev --stdin --name-only --refs="*tags/*" \
+	git name-rev --annotate-stdin --name-only --refs="*tags/*" \
 		< actual > actual.named &&
 	test_cmp expect actual.named
 '
 
 test_expect_success 'name-rev multiple --refs combine inclusive' '
 	git rev-list --left-right --cherry-pick F...E -- bar >actual &&
-	git name-rev --stdin --name-only --refs="*tags/F" --refs="*tags/E" \
+	git name-rev --annotate-stdin --name-only --refs="*tags/F" --refs="*tags/E" \
 		<actual >actual.named &&
 	test_cmp expect actual.named
 '
@@ -113,7 +116,7 @@ EOF
 test_expect_success 'name-rev --refs excludes non-matched patterns' '
 	git rev-list --left-right --right-only --cherry-pick F...E -- bar >>expect &&
 	git rev-list --left-right --cherry-pick F...E -- bar >actual &&
-	git name-rev --stdin --name-only --refs="*tags/F" \
+	git name-rev --annotate-stdin --name-only --refs="*tags/F" \
 		<actual >actual.named &&
 	test_cmp expect actual.named
 '
@@ -125,14 +128,14 @@ EOF
 test_expect_success 'name-rev --exclude excludes matched patterns' '
 	git rev-list --left-right --right-only --cherry-pick F...E -- bar >>expect &&
 	git rev-list --left-right --cherry-pick F...E -- bar >actual &&
-	git name-rev --stdin --name-only --refs="*tags/*" --exclude="*E" \
+	git name-rev --annotate-stdin --name-only --refs="*tags/*" --exclude="*E" \
 		<actual >actual.named &&
 	test_cmp expect actual.named
 '
 
 test_expect_success 'name-rev --no-refs clears the refs list' '
 	git rev-list --left-right --cherry-pick F...E -- bar >expect &&
-	git name-rev --stdin --name-only --refs="*tags/F" --refs="*tags/E" --no-refs --refs="*tags/G" \
+	git name-rev --annotate-stdin --name-only --refs="*tags/F" --refs="*tags/E" --no-refs --refs="*tags/G" \
 		<expect >actual &&
 	test_cmp expect actual
 '
@@ -146,7 +149,7 @@ EOF
 
 test_expect_success '--cherry-mark' '
 	git rev-list --cherry-mark F...E -- bar > actual &&
-	git name-rev --stdin --name-only --refs="*tags/*" \
+	git name-rev --annotate-stdin --name-only --refs="*tags/*" \
 		< actual > actual.named &&
 	test_cmp expect actual.named
 '
@@ -160,7 +163,7 @@ EOF
 
 test_expect_success '--cherry-mark --left-right' '
 	git rev-list --cherry-mark --left-right F...E -- bar > actual &&
-	git name-rev --stdin --name-only --refs="*tags/*" \
+	git name-rev --annotate-stdin --name-only --refs="*tags/*" \
 		< actual > actual.named &&
 	test_cmp expect actual.named
 '
@@ -171,14 +174,14 @@ EOF
 
 test_expect_success '--cherry-pick --right-only' '
 	git rev-list --cherry-pick --right-only F...E -- bar > actual &&
-	git name-rev --stdin --name-only --refs="*tags/*" \
+	git name-rev --annotate-stdin --name-only --refs="*tags/*" \
 		< actual > actual.named &&
 	test_cmp expect actual.named
 '
 
 test_expect_success '--cherry-pick --left-only' '
 	git rev-list --cherry-pick --left-only E...F -- bar > actual &&
-	git name-rev --stdin --name-only --refs="*tags/*" \
+	git name-rev --annotate-stdin --name-only --refs="*tags/*" \
 		< actual > actual.named &&
 	test_cmp expect actual.named
 '
@@ -190,7 +193,7 @@ EOF
 
 test_expect_success '--cherry' '
 	git rev-list --cherry F...E -- bar > actual &&
-	git name-rev --stdin --name-only --refs="*tags/*" \
+	git name-rev --annotate-stdin --name-only --refs="*tags/*" \
 		< actual > actual.named &&
 	test_cmp expect actual.named
 '
@@ -233,7 +236,7 @@ test_expect_success '--cherry-pick with independent, but identical branches' '
 	test_tick &&
 	git commit -m "independent, too" foo &&
 	test -z "$(git rev-list --left-right --cherry-pick \
-		HEAD...master -- foo)"
+		HEAD...main -- foo)"
 '
 
 cat >expect <<EOF
@@ -245,6 +248,18 @@ test_expect_success '--count --left-right' '
 	test_cmp expect actual
 '
 
+test_expect_success '--cherry-pick with duplicates on each side' '
+	git checkout -b dup-orig &&
+	test_commit dup-base &&
+	git revert dup-base &&
+	git cherry-pick dup-base &&
+	git checkout -b dup-side HEAD~3 &&
+	test_tick &&
+	git cherry-pick -3 dup-orig &&
+	git rev-list --cherry-pick dup-orig...dup-side >actual &&
+	test_must_be_empty actual
+'
+
 # Corrupt the object store deliberately to make sure
 # the object is not even checked for its existence.
 remove_loose_object () {
diff --git a/t/t6008-rev-list-submodule.sh b/t/t6008-rev-list-submodule.sh
index c4af9ca..2cdef6f 100755
--- a/t/t6008-rev-list-submodule.sh
+++ b/t/t6008-rev-list-submodule.sh
@@ -5,6 +5,10 @@
 
 test_description='git rev-list involving submodules that this repo has'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -23,7 +27,7 @@ test_expect_success 'setup' '
 
 	: > super-file &&
 	git add super-file &&
-	git submodule add "$(pwd)" sub &&
+	git -c protocol.file.allow=always submodule add "$(pwd)" sub &&
 	git symbolic-ref HEAD refs/heads/super &&
 	test_tick &&
 	git commit -m super-initial &&
@@ -36,7 +40,7 @@ test_expect_success 'setup' '
 '
 
 test_expect_success "Ilari's test" '
-	git rev-list --objects super master ^super^
+	git rev-list --objects super main ^super^
 '
 
 test_done
diff --git a/t/t6009-rev-list-parent.sh b/t/t6009-rev-list-parent.sh
index 916d969..91db8fa 100755
--- a/t/t6009-rev-list-parent.sh
+++ b/t/t6009-rev-list-parent.sh
@@ -2,6 +2,10 @@
 
 test_description='ancestor culling and limiting by parent number'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 check_revlist () {
@@ -45,7 +49,7 @@ test_expect_success 'setup roots, merges and octopuses' '
 	test_commit seven &&
 	git checkout -b yetanotherbranch four &&
 	test_commit eight &&
-	git checkout master &&
+	git checkout main &&
 	test_tick &&
 	git merge --allow-unrelated-histories -m normalmerge newroot &&
 	git tag normalmerge &&
@@ -56,7 +60,18 @@ test_expect_success 'setup roots, merges and octopuses' '
 	test_tick &&
 	git merge -m tetrapus sidebranch anotherbranch yetanotherbranch &&
 	git tag tetrapus &&
-	git checkout master
+	git checkout main
+'
+
+test_expect_success 'parse --max-parents & --min-parents' '
+	test_must_fail git rev-list --max-parents=1q HEAD 2>error &&
+	grep "not an integer" error &&
+
+	test_must_fail git rev-list --min-parents=1q HEAD 2>error &&
+	grep "not an integer" error &&
+
+	git rev-list --max-parents=1 --min-parents=1 HEAD &&
+	git rev-list --max-parents=-1 --min-parents=-1 HEAD
 '
 
 test_expect_success 'rev-list roots' '
@@ -121,9 +136,9 @@ test_expect_success 'dodecapus' '
 		git checkout -b root$i five &&
 		test_commit $i &&
 		roots="$roots root$i" ||
-		return
+		return 1
 	done &&
-	git checkout master &&
+	git checkout main &&
 	test_tick &&
 	git merge -m dodecapus $roots &&
 	git tag dodecapus &&
@@ -139,8 +154,8 @@ test_expect_success 'ancestors with the same commit time' '
 
 	test_tick_keep=$test_tick &&
 	for i in 1 2 3 4 5 6 7 8; do
-		test_tick=$test_tick_keep
-		test_commit t$i
+		test_tick=$test_tick_keep &&
+		test_commit t$i || return 1
 	done &&
 	git rev-list t1^! --not t$i >result &&
 	test_must_be_empty result
diff --git a/t/t6011-rev-list-with-bad-commit.sh b/t/t6011-rev-list-with-bad-commit.sh
index bad02cf..b2e422c 100755
--- a/t/t6011-rev-list-with-bad-commit.sh
+++ b/t/t6011-rev-list-with-bad-commit.sh
@@ -2,6 +2,7 @@
 
 test_description='git rev-list should notice bad commits'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # Note:
diff --git a/t/t6012-rev-list-simplify.sh b/t/t6012-rev-list-simplify.sh
index b6fa43a..de1e87f 100755
--- a/t/t6012-rev-list-simplify.sh
+++ b/t/t6012-rev-list-simplify.sh
@@ -2,6 +2,9 @@
 
 test_description='merge simplification'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 note () {
@@ -9,17 +12,18 @@ note () {
 }
 
 unnote () {
-	git name-rev --tags --stdin | sed -e "s|$OID_REGEX (tags/\([^)]*\)) |\1 |g"
+	test_when_finished "rm -f tmp" &&
+	git name-rev --tags --annotate-stdin >tmp &&
+	sed -e "s|$OID_REGEX (tags/\([^)]*\)) |\1 |g" <tmp
 }
 
 #
-# Create a test repo with interesting commit graph:
+# Create a test repo with an interesting commit graph:
 #
-# A--B----------G--H--I--K--L
-#  \  \           /     /
-#   \  \         /     /
-#    C------E---F     J
-#        \_/
+# A-----B-----G--H--I--K--L
+#  \     \      /     /
+#   \     \    /     /
+#    C--D--E--F     J
 #
 # The commits are laid out from left-to-right starting with
 # the root commit A and terminating at the tip commit L.
@@ -43,7 +47,7 @@ test_expect_success setup '
 	git add side &&
 	test_tick && git commit -m "Side root" &&
 	note J &&
-	git checkout master &&
+	git checkout main &&
 
 	echo "Hello" >file &&
 	echo "second" >lost &&
@@ -65,7 +69,7 @@ test_expect_success setup '
 	note D &&
 
 	test_tick &&
-	test_must_fail git merge -m "merge" master &&
+	test_must_fail git merge -m "merge" main &&
 	>lost && git commit -a -m "merge" &&
 	note E &&
 
@@ -74,7 +78,7 @@ test_expect_success setup '
 	test_tick && git commit -m "Irrelevant change" &&
 	note F &&
 
-	git checkout master &&
+	git checkout main &&
 	echo "Yet another" >elif &&
 	git add elif &&
 	test_tick && git commit -m "Another irrelevant change" &&
@@ -87,7 +91,7 @@ test_expect_success setup '
 	test_tick && git commit -a -m "Final change" &&
 	note I &&
 
-	git checkout master &&
+	git checkout main &&
 	test_tick && git merge --allow-unrelated-histories -m "Coolest" unrelated &&
 	note K &&
 
@@ -109,8 +113,8 @@ check_outcome () {
 	shift &&
 	param="$*" &&
 	test_expect_$outcome "log $param" '
-		git log --pretty="$FMT" --parents $param |
-		unnote >actual &&
+		git log --pretty="$FMT" --parents $param >out &&
+		unnote >actual <out &&
 		sed -e "s/^.*	\([^ ]*\) .*/\1/" >check <actual &&
 		test_cmp expect check
 	'
@@ -139,11 +143,18 @@ check_result 'I B A' --author-date-order -- file
 check_result 'H' --first-parent -- another-file
 check_result 'H' --first-parent --topo-order -- another-file
 
+check_result 'L K I H G B A' --first-parent L
+check_result 'F E D C' --exclude-first-parent-only F ^L
+check_result '' F ^L
+check_result 'L K I H G J' L ^F
+check_result 'L K I H G B J' --exclude-first-parent-only L ^F
+check_result 'L K I H G B' --exclude-first-parent-only --first-parent L ^F
+
 check_result 'E C B A' --full-history E -- lost
 test_expect_success 'full history simplification without parent' '
 	printf "%s\n" E C B A >expect &&
-	git log --pretty="$FMT" --full-history E -- lost |
-	unnote >actual &&
+	git log --pretty="$FMT" --full-history E -- lost >out &&
+	unnote >actual <out &&
 	sed -e "s/^.*	\([^ ]*\) .*/\1/" >check <actual &&
 	test_cmp expect check
 '
@@ -168,10 +179,10 @@ test_expect_success '--full-diff is not affected by --parents' '
 #
 # This example is explained in Documentation/rev-list-options.txt
 
-test_expect_success 'rebuild repo' '
+test_expect_success 'setup rebuild repo' '
 	rm -rf .git * &&
 	git init &&
-	git switch -c main &&
+	git switch -c topic &&
 
 	echo base >file &&
 	git add file &&
@@ -186,7 +197,7 @@ test_expect_success 'rebuild repo' '
 	git add file &&
 	test_commit B &&
 
-	git switch main &&
+	git switch topic &&
 	test_must_fail git merge -m "M" B &&
 	echo A >file &&
 	echo B >>file &&
@@ -207,7 +218,7 @@ test_expect_success 'rebuild repo' '
 	git merge -m R -Xtheirs X &&
 	note R &&
 
-	git switch main &&
+	git switch topic &&
 	git merge -m N R &&
 	note N &&
 
@@ -221,7 +232,7 @@ test_expect_success 'rebuild repo' '
 	git add z &&
 	test_commit Z &&
 
-	git switch main &&
+	git switch topic &&
 	git merge -m O Z &&
 	note O &&
 
diff --git a/t/t6013-rev-list-reverse-parents.sh b/t/t6013-rev-list-reverse-parents.sh
index 89458d3..39793cb 100755
--- a/t/t6013-rev-list-reverse-parents.sh
+++ b/t/t6013-rev-list-reverse-parents.sh
@@ -2,6 +2,9 @@
 
 test_description='--reverse combines with --parents'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 
@@ -18,24 +21,24 @@ test_expect_success 'set up --reverse example' '
 	commit two &&
 	git checkout -b side HEAD^ &&
 	commit three &&
-	git checkout master &&
+	git checkout main &&
 	git merge -s ours side &&
 	commit five
 	'
 
 test_expect_success '--reverse --parents --full-history combines correctly' '
-	git rev-list --parents --full-history master -- foo |
+	git rev-list --parents --full-history main -- foo |
 		perl -e "print reverse <>" > expected &&
-	git rev-list --reverse --parents --full-history master -- foo \
+	git rev-list --reverse --parents --full-history main -- foo \
 		> actual &&
 	test_cmp expected actual
 	'
 
 test_expect_success '--boundary does too' '
-	git rev-list --boundary --parents --full-history master ^root -- foo |
+	git rev-list --boundary --parents --full-history main ^root -- foo |
 		perl -e "print reverse <>" > expected &&
 	git rev-list --boundary --reverse --parents --full-history \
-		master ^root -- foo > actual &&
+		main ^root -- foo > actual &&
 	test_cmp expected actual
 	'
 
diff --git a/t/t6014-rev-list-all.sh b/t/t6014-rev-list-all.sh
index c9bedd2..16b8bd1 100755
--- a/t/t6014-rev-list-all.sh
+++ b/t/t6014-rev-list-all.sh
@@ -2,6 +2,7 @@
 
 test_description='--all includes detached HEADs'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 
diff --git a/t/t6016-rev-list-graph-simplify-history.sh b/t/t6016-rev-list-graph-simplify-history.sh
index f5e6e92..54b0a6f 100755
--- a/t/t6016-rev-list-graph-simplify-history.sh
+++ b/t/t6016-rev-list-graph-simplify-history.sh
@@ -7,14 +7,23 @@
 
 test_description='--graph and simplified history'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-log-graph.sh
+
+check_graph () {
+	cat >expect &&
+	lib_test_cmp_graph --format=%s "$@"
+}
 
 test_expect_success 'set up rev-list --graph test' '
 	# 3 commits on branch A
 	test_commit A1 foo.txt &&
 	test_commit A2 bar.txt &&
 	test_commit A3 bar.txt &&
-	git branch -m master A &&
+	git branch -m main A &&
 
 	# 2 commits on branch B, started from A1
 	git checkout -b B A1 &&
@@ -28,7 +37,7 @@ test_expect_success 'set up rev-list --graph test' '
 
 	# Octopus merge B and C into branch A
 	git checkout A &&
-	git merge B C &&
+	git merge B C -m A4 &&
 	git tag A4 &&
 
 	test_commit A5 bar.txt &&
@@ -38,81 +47,64 @@ test_expect_success 'set up rev-list --graph test' '
 	test_commit C3 foo.txt &&
 	test_commit C4 bar.txt &&
 	git checkout A &&
-	git merge -s ours C &&
+	git merge -s ours C -m A6 &&
 	git tag A6 &&
 
-	test_commit A7 bar.txt &&
-
-	# Store commit names in variables for later use
-	A1=$(git rev-parse --verify A1) &&
-	A2=$(git rev-parse --verify A2) &&
-	A3=$(git rev-parse --verify A3) &&
-	A4=$(git rev-parse --verify A4) &&
-	A5=$(git rev-parse --verify A5) &&
-	A6=$(git rev-parse --verify A6) &&
-	A7=$(git rev-parse --verify A7) &&
-	B1=$(git rev-parse --verify B1) &&
-	B2=$(git rev-parse --verify B2) &&
-	C1=$(git rev-parse --verify C1) &&
-	C2=$(git rev-parse --verify C2) &&
-	C3=$(git rev-parse --verify C3) &&
-	C4=$(git rev-parse --verify C4)
-	'
+	test_commit A7 bar.txt
+'
 
 test_expect_success '--graph --all' '
-	rm -f expected &&
-	echo "* $A7" >> expected &&
-	echo "*   $A6" >> expected &&
-	echo "|\\  " >> expected &&
-	echo "| * $C4" >> expected &&
-	echo "| * $C3" >> expected &&
-	echo "* | $A5" >> expected &&
-	echo "| |   " >> expected &&
-	echo "|  \\  " >> expected &&
-	echo "*-. | $A4" >> expected &&
-	echo "|\\ \\| " >> expected &&
-	echo "| | * $C2" >> expected &&
-	echo "| | * $C1" >> expected &&
-	echo "| * | $B2" >> expected &&
-	echo "| * | $B1" >> expected &&
-	echo "* | | $A3" >> expected &&
-	echo "| |/  " >> expected &&
-	echo "|/|   " >> expected &&
-	echo "* | $A2" >> expected &&
-	echo "|/  " >> expected &&
-	echo "* $A1" >> expected &&
-	git rev-list --graph --all > actual &&
-	test_cmp expected actual
-	'
+	check_graph --all <<-\EOF
+	* A7
+	*   A6
+	|\
+	| * C4
+	| * C3
+	* | A5
+	| |
+	|  \
+	*-. | A4
+	|\ \|
+	| | * C2
+	| | * C1
+	| * | B2
+	| * | B1
+	* | | A3
+	| |/
+	|/|
+	* | A2
+	|/
+	* A1
+	EOF
+'
 
 # Make sure the graph_is_interesting() code still realizes
 # that undecorated merges are interesting, even with --simplify-by-decoration
 test_expect_success '--graph --simplify-by-decoration' '
-	rm -f expected &&
 	git tag -d A4 &&
-	echo "* $A7" >> expected &&
-	echo "*   $A6" >> expected &&
-	echo "|\\  " >> expected &&
-	echo "| * $C4" >> expected &&
-	echo "| * $C3" >> expected &&
-	echo "* | $A5" >> expected &&
-	echo "| |   " >> expected &&
-	echo "|  \\  " >> expected &&
-	echo "*-. | $A4" >> expected &&
-	echo "|\\ \\| " >> expected &&
-	echo "| | * $C2" >> expected &&
-	echo "| | * $C1" >> expected &&
-	echo "| * | $B2" >> expected &&
-	echo "| * | $B1" >> expected &&
-	echo "* | | $A3" >> expected &&
-	echo "| |/  " >> expected &&
-	echo "|/|   " >> expected &&
-	echo "* | $A2" >> expected &&
-	echo "|/  " >> expected &&
-	echo "* $A1" >> expected &&
-	git rev-list --graph --all --simplify-by-decoration > actual &&
-	test_cmp expected actual
-	'
+	check_graph --all --simplify-by-decoration <<-\EOF
+	* A7
+	*   A6
+	|\
+	| * C4
+	| * C3
+	* | A5
+	| |
+	|  \
+	*-. | A4
+	|\ \|
+	| | * C2
+	| | * C1
+	| * | B2
+	| * | B1
+	* | | A3
+	| |/
+	|/|
+	* | A2
+	|/
+	* A1
+	EOF
+'
 
 test_expect_success 'setup: get rid of decorations on B' '
 	git tag -d B2 &&
@@ -122,142 +114,133 @@ test_expect_success 'setup: get rid of decorations on B' '
 
 # Graph with branch B simplified away
 test_expect_success '--graph --simplify-by-decoration prune branch B' '
-	rm -f expected &&
-	echo "* $A7" >> expected &&
-	echo "*   $A6" >> expected &&
-	echo "|\\  " >> expected &&
-	echo "| * $C4" >> expected &&
-	echo "| * $C3" >> expected &&
-	echo "* | $A5" >> expected &&
-	echo "* | $A4" >> expected &&
-	echo "|\\| " >> expected &&
-	echo "| * $C2" >> expected &&
-	echo "| * $C1" >> expected &&
-	echo "* | $A3" >> expected &&
-	echo "|/  " >> expected &&
-	echo "* $A2" >> expected &&
-	echo "* $A1" >> expected &&
-	git rev-list --graph --simplify-by-decoration --all > actual &&
-	test_cmp expected actual
-	'
+	check_graph --simplify-by-decoration --all <<-\EOF
+	* A7
+	*   A6
+	|\
+	| * C4
+	| * C3
+	* | A5
+	* | A4
+	|\|
+	| * C2
+	| * C1
+	* | A3
+	|/
+	* A2
+	* A1
+	EOF
+'
 
 test_expect_success '--graph --full-history -- bar.txt' '
-	rm -f expected &&
-	echo "* $A7" >> expected &&
-	echo "*   $A6" >> expected &&
-	echo "|\\  " >> expected &&
-	echo "| * $C4" >> expected &&
-	echo "* | $A5" >> expected &&
-	echo "* | $A4" >> expected &&
-	echo "|\\| " >> expected &&
-	echo "* | $A3" >> expected &&
-	echo "|/  " >> expected &&
-	echo "* $A2" >> expected &&
-	git rev-list --graph --full-history --all -- bar.txt > actual &&
-	test_cmp expected actual
-	'
+	check_graph --full-history --all -- bar.txt <<-\EOF
+	* A7
+	*   A6
+	|\
+	| * C4
+	* | A5
+	* | A4
+	|\|
+	* | A3
+	|/
+	* A2
+	EOF
+'
 
 test_expect_success '--graph --full-history --simplify-merges -- bar.txt' '
-	rm -f expected &&
-	echo "* $A7" >> expected &&
-	echo "*   $A6" >> expected &&
-	echo "|\\  " >> expected &&
-	echo "| * $C4" >> expected &&
-	echo "* | $A5" >> expected &&
-	echo "* | $A3" >> expected &&
-	echo "|/  " >> expected &&
-	echo "* $A2" >> expected &&
-	git rev-list --graph --full-history --simplify-merges --all \
-		-- bar.txt > actual &&
-	test_cmp expected actual
-	'
+	check_graph --full-history --simplify-merges --all -- bar.txt <<-\EOF
+	* A7
+	*   A6
+	|\
+	| * C4
+	* | A5
+	* | A3
+	|/
+	* A2
+	EOF
+'
 
 test_expect_success '--graph -- bar.txt' '
-	rm -f expected &&
-	echo "* $A7" >> expected &&
-	echo "* $A5" >> expected &&
-	echo "* $A3" >> expected &&
-	echo "| * $C4" >> expected &&
-	echo "|/  " >> expected &&
-	echo "* $A2" >> expected &&
-	git rev-list --graph --all -- bar.txt > actual &&
-	test_cmp expected actual
-	'
+	check_graph --all -- bar.txt <<-\EOF
+	* A7
+	* A5
+	* A3
+	| * C4
+	|/
+	* A2
+	EOF
+'
 
 test_expect_success '--graph --sparse -- bar.txt' '
-	rm -f expected &&
-	echo "* $A7" >> expected &&
-	echo "* $A6" >> expected &&
-	echo "* $A5" >> expected &&
-	echo "* $A4" >> expected &&
-	echo "* $A3" >> expected &&
-	echo "| * $C4" >> expected &&
-	echo "| * $C3" >> expected &&
-	echo "| * $C2" >> expected &&
-	echo "| * $C1" >> expected &&
-	echo "|/  " >> expected &&
-	echo "* $A2" >> expected &&
-	echo "* $A1" >> expected &&
-	git rev-list --graph --sparse --all -- bar.txt > actual &&
-	test_cmp expected actual
-	'
+	check_graph --sparse --all -- bar.txt <<-\EOF
+	* A7
+	* A6
+	* A5
+	* A4
+	* A3
+	| * C4
+	| * C3
+	| * C2
+	| * C1
+	|/
+	* A2
+	* A1
+	EOF
+'
 
 test_expect_success '--graph ^C4' '
-	rm -f expected &&
-	echo "* $A7" >> expected &&
-	echo "* $A6" >> expected &&
-	echo "* $A5" >> expected &&
-	echo "*   $A4" >> expected &&
-	echo "|\\  " >> expected &&
-	echo "| * $B2" >> expected &&
-	echo "| * $B1" >> expected &&
-	echo "* $A3" >> expected &&
-	git rev-list --graph --all ^C4 > actual &&
-	test_cmp expected actual
-	'
+	check_graph --all ^C4 <<-\EOF
+	* A7
+	* A6
+	* A5
+	*   A4
+	|\
+	| * B2
+	| * B1
+	* A3
+	EOF
+'
 
 test_expect_success '--graph ^C3' '
-	rm -f expected &&
-	echo "* $A7" >> expected &&
-	echo "*   $A6" >> expected &&
-	echo "|\\  " >> expected &&
-	echo "| * $C4" >> expected &&
-	echo "* $A5" >> expected &&
-	echo "*   $A4" >> expected &&
-	echo "|\\  " >> expected &&
-	echo "| * $B2" >> expected &&
-	echo "| * $B1" >> expected &&
-	echo "* $A3" >> expected &&
-	git rev-list --graph --all ^C3 > actual &&
-	test_cmp expected actual
-	'
+	check_graph --all ^C3 <<-\EOF
+	* A7
+	*   A6
+	|\
+	| * C4
+	* A5
+	*   A4
+	|\
+	| * B2
+	| * B1
+	* A3
+	EOF
+'
 
 # I don't think the ordering of the boundary commits is really
 # that important, but this test depends on it.  If the ordering ever changes
 # in the code, we'll need to update this test.
 test_expect_success '--graph --boundary ^C3' '
-	rm -f expected &&
-	echo "* $A7" >> expected &&
-	echo "*   $A6" >> expected &&
-	echo "|\\  " >> expected &&
-	echo "| * $C4" >> expected &&
-	echo "* | $A5" >> expected &&
-	echo "| |     " >> expected &&
-	echo "|  \\    " >> expected &&
-	echo "*-. \\   $A4" >> expected &&
-	echo "|\\ \\ \\  " >> expected &&
-	echo "| * | | $B2" >> expected &&
-	echo "| * | | $B1" >> expected &&
-	echo "* | | | $A3" >> expected &&
-	echo "o | | | $A2" >> expected &&
-	echo "|/ / /  " >> expected &&
-	echo "o / / $A1" >> expected &&
-	echo " / /  " >> expected &&
-	echo "| o $C3" >> expected &&
-	echo "|/  " >> expected &&
-	echo "o $C2" >> expected &&
-	git rev-list --graph --boundary --all ^C3 > actual &&
-	test_cmp expected actual
-	'
+	check_graph --boundary --all ^C3 <<-\EOF
+	* A7
+	*   A6
+	|\
+	| * C4
+	* | A5
+	| |
+	|  \
+	*-. \   A4
+	|\ \ \
+	| * | | B2
+	| * | | B1
+	* | | | A3
+	o | | | A2
+	|/ / /
+	o / / A1
+	 / /
+	| o C3
+	|/
+	o C2
+	EOF
+'
 
 test_done
diff --git a/t/t6017-rev-list-stdin.sh b/t/t6017-rev-list-stdin.sh
index 667b375..4821b90 100755
--- a/t/t6017-rev-list-stdin.sh
+++ b/t/t6017-rev-list-stdin.sh
@@ -5,6 +5,9 @@
 
 test_description='log family learns --stdin'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 check () {
@@ -40,16 +43,18 @@ test_expect_success setup '
 		done &&
 		for i in $them
 		do
-			git checkout -b side-$i master~$i &&
+			git checkout -b side-$i main~$i &&
 			echo updated $i >file-$i &&
 			git add file-$i &&
 			test_tick &&
 			git commit -m side-$i || exit
-		done
+		done &&
+
+		git update-ref refs/heads/-dashed-branch HEAD
 	)
 '
 
-check master
+check main
 check side-1 ^side-4
 check side-1 ^side-7 --
 check side-1 ^side-7 -- file-1
@@ -57,6 +62,13 @@ check side-1 ^side-7 -- file-2
 check side-3 ^side-4 -- file-3
 check side-3 ^side-2
 check side-3 ^side-2 -- file-1
+check --all
+check --all --not --branches
+check --glob=refs/heads
+check --glob=refs/heads --
+check --glob=refs/heads -- file-1
+check --end-of-options -dashed-branch
+check --all --not refs/heads/main
 
 test_expect_success 'not only --stdin' '
 	cat >expect <<-EOF &&
@@ -66,13 +78,74 @@ test_expect_success 'not only --stdin' '
 	file-2
 	EOF
 	cat >input <<-EOF &&
-	^master^
+	^main^
 	--
 	file-2
 	EOF
-	git log --pretty=tformat:%s --name-only --stdin master -- file-1 \
+	git log --pretty=tformat:%s --name-only --stdin main -- file-1 \
 		<input >actual &&
 	test_cmp expect actual
 '
 
+test_expect_success 'pseudo-opt with missing value' '
+	cat >input <<-EOF &&
+	--glob
+	refs/heads
+	EOF
+
+	cat >expect <<-EOF &&
+	fatal: Option ${SQ}--glob${SQ} requires a value
+	EOF
+
+	test_must_fail git rev-list --stdin <input 2>error &&
+	test_cmp expect error
+'
+
+test_expect_success 'pseudo-opt with invalid value' '
+	cat >input <<-EOF &&
+	--no-walk=garbage
+	EOF
+
+	cat >expect <<-EOF &&
+	error: invalid argument to --no-walk
+	fatal: invalid option ${SQ}--no-walk=garbage${SQ} in --stdin mode
+	EOF
+
+	test_must_fail git rev-list --stdin <input 2>error &&
+	test_cmp expect error
+'
+
+test_expect_success 'unknown option without --end-of-options' '
+	cat >input <<-EOF &&
+	-dashed-branch
+	EOF
+
+	cat >expect <<-EOF &&
+	fatal: invalid option ${SQ}-dashed-branch${SQ} in --stdin mode
+	EOF
+
+	test_must_fail git rev-list --stdin <input 2>error &&
+	test_cmp expect error
+'
+
+test_expect_success '--not on command line does not influence revisions read via --stdin' '
+	cat >input <<-EOF &&
+	refs/heads/main
+	EOF
+	git rev-list refs/heads/main >expect &&
+
+	git rev-list refs/heads/main --not --stdin <input >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success '--not via stdin does not influence revisions from command line' '
+	cat >input <<-EOF &&
+	--not
+	EOF
+	git rev-list refs/heads/main >expect &&
+
+	git rev-list refs/heads/main --stdin refs/heads/main <input >actual &&
+	test_cmp expect actual
+'
+
 test_done
diff --git a/t/t6018-rev-list-glob.sh b/t/t6018-rev-list-glob.sh
index bb5aeac..3b181f7 100755
--- a/t/t6018-rev-list-glob.sh
+++ b/t/t6018-rev-list-glob.sh
@@ -2,6 +2,10 @@
 
 test_description='rev-list/rev-parse --glob'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 commit () {
@@ -20,23 +24,23 @@ compare () {
 
 test_expect_success 'setup' '
 
-	commit master &&
-	git checkout -b subspace/one master &&
+	commit main &&
+	git checkout -b subspace/one main &&
 	commit one &&
-	git checkout -b subspace/two master &&
+	git checkout -b subspace/two main &&
 	commit two &&
-	git checkout -b subspace-x master &&
+	git checkout -b subspace-x main &&
 	commit subspace-x &&
-	git checkout -b other/three master &&
+	git checkout -b other/three main &&
 	commit three &&
-	git checkout -b someref master &&
+	git checkout -b someref main &&
 	commit some &&
-	git checkout master &&
-	commit master2 &&
-	git tag foo/bar master &&
-	commit master3 &&
-	git update-ref refs/remotes/foo/baz master &&
-	commit master4 &&
+	git checkout main &&
+	commit topic_2 &&
+	git tag foo/bar main &&
+	commit topic_3 &&
+	git update-ref refs/remotes/foo/baz main &&
+	commit topic_4 &&
 	git update-ref refs/remotes/upstream/one subspace/one &&
 	git update-ref refs/remotes/upstream/two subspace/two &&
 	git update-ref refs/remotes/upstream/x subspace-x &&
@@ -83,7 +87,7 @@ test_expect_failure 'rev-parse accepts --glob as detached option' '
 
 test_expect_failure 'rev-parse is not confused by option-like glob' '
 
-	compare rev-parse "master" "--glob --symbolic master"
+	compare rev-parse "main" "--glob --symbolic main"
 
 '
 
@@ -111,15 +115,15 @@ test_expect_success 'rev-parse --glob=heads/subspace/* --glob=heads/other/*' '
 
 '
 
-test_expect_success 'rev-parse --glob=heads/someref/* master' '
+test_expect_success 'rev-parse --glob=heads/someref/* main' '
 
-	compare rev-parse "master" "--glob=heads/someref/* master"
+	compare rev-parse "main" "--glob=heads/someref/* main"
 
 '
 
 test_expect_success 'rev-parse --glob=heads/*' '
 
-	compare rev-parse "master other/three someref subspace-x subspace/one subspace/two" "--glob=heads/*"
+	compare rev-parse "main other/three someref subspace-x subspace/one subspace/two" "--glob=heads/*"
 
 '
 
@@ -136,7 +140,7 @@ test_expect_success 'rev-parse --remotes=foo' '
 '
 
 test_expect_success 'rev-parse --exclude with --branches' '
-	compare rev-parse "--exclude=*/* --branches" "master someref subspace-x"
+	compare rev-parse "--exclude=*/* --branches" "main someref subspace-x"
 '
 
 test_expect_success 'rev-parse --exclude with --all' '
@@ -183,6 +187,44 @@ test_expect_success 'rev-parse --exclude=ref with --remotes=glob' '
 	compare rev-parse "--exclude=upstream/x --remotes=upstream/*" "upstream/one upstream/two"
 '
 
+for section in fetch receive uploadpack
+do
+	test_expect_success "rev-parse --exclude-hidden=$section with --all" '
+		compare "-c transfer.hideRefs=refs/remotes/ rev-parse" "--branches --tags" "--exclude-hidden=$section --all"
+	'
+
+	test_expect_success "rev-parse --exclude-hidden=$section with --all" '
+		compare "-c transfer.hideRefs=refs/heads/subspace/ rev-parse" "--exclude=refs/heads/subspace/* --all" "--exclude-hidden=$section --all"
+	'
+
+	test_expect_success "rev-parse --exclude-hidden=$section with --glob" '
+		compare "-c transfer.hideRefs=refs/heads/subspace/ rev-parse" "--exclude=refs/heads/subspace/* --glob=refs/heads/*" "--exclude-hidden=$section --glob=refs/heads/*"
+	'
+
+	test_expect_success "rev-parse --exclude-hidden=$section can be passed once per pseudo-ref" '
+		compare "-c transfer.hideRefs=refs/remotes/ rev-parse" "--branches --tags --branches --tags" "--exclude-hidden=$section --all --exclude-hidden=$section --all"
+	'
+
+	test_expect_success "rev-parse --exclude-hidden=$section can only be passed once per pseudo-ref" '
+		echo "fatal: --exclude-hidden= passed more than once" >expected &&
+		test_must_fail git rev-parse --exclude-hidden=$section --exclude-hidden=$section 2>err &&
+		test_cmp expected err
+	'
+
+	for pseudoopt in branches tags remotes
+	do
+		test_expect_success "rev-parse --exclude-hidden=$section fails with --$pseudoopt" '
+			test_must_fail git rev-parse --exclude-hidden=$section --$pseudoopt 2>err &&
+			test_grep "error: options .--exclude-hidden. and .--$pseudoopt. cannot be used together" err
+		'
+
+		test_expect_success "rev-parse --exclude-hidden=$section fails with --$pseudoopt=pattern" '
+			test_must_fail git rev-parse --exclude-hidden=$section --$pseudoopt=pattern 2>err &&
+			test_grep "error: options .--exclude-hidden. and .--$pseudoopt. cannot be used together" err
+		'
+	done
+done
+
 test_expect_success 'rev-list --exclude=glob with --branches=glob' '
 	compare rev-list "--exclude=subspace-* --branches=sub*" "subspace/one subspace/two"
 '
@@ -221,7 +263,7 @@ test_expect_success 'rev-list --glob refs/heads/subspace/*' '
 
 test_expect_success 'rev-list not confused by option-like --glob arg' '
 
-	compare rev-list "master" "--glob -0 master"
+	compare rev-list "main" "--glob -0 main"
 
 '
 
@@ -269,13 +311,13 @@ test_expect_success 'rev-list --branches=subspace' '
 
 test_expect_success 'rev-list --branches' '
 
-	compare rev-list "master subspace-x someref other/three subspace/one subspace/two" "--branches"
+	compare rev-list "main subspace-x someref other/three subspace/one subspace/two" "--branches"
 
 '
 
-test_expect_success 'rev-list --glob=heads/someref/* master' '
+test_expect_success 'rev-list --glob=heads/someref/* main' '
 
-	compare rev-list "master" "--glob=heads/someref/* master"
+	compare rev-list "main" "--glob=heads/someref/* main"
 
 '
 
@@ -287,7 +329,7 @@ test_expect_success 'rev-list --glob=heads/subspace/* --glob=heads/other/*' '
 
 test_expect_success 'rev-list --glob=heads/*' '
 
-	compare rev-list "master other/three someref subspace-x subspace/one subspace/two" "--glob=heads/*"
+	compare rev-list "main other/three someref subspace-x subspace/one subspace/two" "--glob=heads/*"
 
 '
 
@@ -310,7 +352,7 @@ test_expect_success 'rev-list --remotes=foo' '
 '
 
 test_expect_success 'rev-list --exclude with --branches' '
-	compare rev-list "--exclude=*/* --branches" "master someref subspace-x"
+	compare rev-list "--exclude=*/* --branches" "main someref subspace-x"
 '
 
 test_expect_success 'rev-list --exclude with --all' '
@@ -345,17 +387,22 @@ test_expect_success 'rev-list should succeed with empty output with empty glob'
 	test_must_be_empty actual
 '
 
+test_expect_success 'rev-list should succeed with empty output when ignoring missing' '
+	git rev-list --ignore-missing $ZERO_OID >actual &&
+	test_must_be_empty actual
+'
+
 test_expect_success 'shortlog accepts --glob/--tags/--remotes' '
 
 	compare shortlog "subspace/one subspace/two" --branches=subspace &&
 	compare shortlog \
-	  "master subspace-x someref other/three subspace/one subspace/two" \
+	  "main subspace-x someref other/three subspace/one subspace/two" \
 	  --branches &&
-	compare shortlog master "--glob=heads/someref/* master" &&
+	compare shortlog main "--glob=heads/someref/* main" &&
 	compare shortlog "subspace/one subspace/two other/three" \
 	  "--glob=heads/subspace/* --glob=heads/other/*" &&
 	compare shortlog \
-	  "master other/three someref subspace-x subspace/one subspace/two" \
+	  "main other/three someref subspace-x subspace/one subspace/two" \
 	  "--glob=heads/*" &&
 	compare shortlog foo/bar --tags=foo &&
 	compare shortlog "foo/bar qux/one qux/two qux/x" --tags &&
@@ -366,14 +413,14 @@ test_expect_success 'shortlog accepts --glob/--tags/--remotes' '
 test_expect_failure 'shortlog accepts --glob as detached option' '
 
 	compare shortlog \
-	  "master other/three someref subspace-x subspace/one subspace/two" \
+	  "main other/three someref subspace-x subspace/one subspace/two" \
 	  "--glob heads/*"
 
 '
 
 test_expect_failure 'shortlog --glob is not confused by option-like argument' '
 
-	compare shortlog master "--glob -e master"
+	compare shortlog main "--glob -e main"
 
 '
 
diff --git a/t/t6019-rev-list-ancestry-path.sh b/t/t6019-rev-list-ancestry-path.sh
index 353f843..738da23 100755
--- a/t/t6019-rev-list-ancestry-path.sh
+++ b/t/t6019-rev-list-ancestry-path.sh
@@ -8,8 +8,13 @@ test_description='--ancestry-path'
 #   /                     \
 #  A-------K---------------L--M
 #
-#  D..M                 == E F G H I J K L M
-#  --ancestry-path D..M == E F H I J L M
+#  D..M                                     == E F G H I J K L M
+#  --ancestry-path                     D..M == E F   H I J   L M
+#  --ancestry-path=F                   D..M == E F       J   L M
+#  --ancestry-path=G                   D..M ==     G H I J   L M
+#  --ancestry-path=H                   D..M == E   G H I J   L M
+#  --ancestry-path=K                   D..M ==             K L M
+#  --ancestry-path=K --ancestry-path=F D..M == E F       J K L M
 #
 #  D..M -- M.t                 == M
 #  --ancestry-path D..M -- M.t == M
@@ -21,6 +26,9 @@ test_description='--ancestry-path'
 #  --ancestry-path G..M -- G.t == L
 #  --ancestry-path --simplify-merges G^..M -- G.t == G L
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 test_merge () {
@@ -47,73 +55,41 @@ test_expect_success setup '
 	test_commit M
 '
 
-test_expect_success 'rev-list D..M' '
-	for c in E F G H I J K L M; do echo $c; done >expect &&
-	git rev-list --format=%s D..M |
-	sed -e "/^commit /d" |
-	sort >actual &&
-	test_cmp expect actual
-'
-
-test_expect_success 'rev-list --ancestry-path D..M' '
-	for c in E F H I J L M; do echo $c; done >expect &&
-	git rev-list --ancestry-path --format=%s D..M |
-	sed -e "/^commit /d" |
-	sort >actual &&
-	test_cmp expect actual
-'
-
-test_expect_success 'rev-list D..M -- M.t' '
-	echo M >expect &&
-	git rev-list --format=%s D..M -- M.t |
-	sed -e "/^commit /d" >actual &&
-	test_cmp expect actual
-'
-
-test_expect_success 'rev-list --ancestry-path D..M -- M.t' '
-	echo M >expect &&
-	git rev-list --ancestry-path --format=%s D..M -- M.t |
-	sed -e "/^commit /d" >actual &&
-	test_cmp expect actual
-'
+test_ancestry () {
+	args=$1
+	expected=$2
+	test_expect_success "log $args" "
+		test_write_lines $expected >expect &&
+		git log --format=%s $args >raw &&
+
+		if test -n \"$expected\"
+		then
+			sort raw >actual &&
+			test_cmp expect actual
+		else
+			test_must_be_empty raw
+		fi
+	"
+}
 
-test_expect_success 'rev-list F...I' '
-	for c in F G H I; do echo $c; done >expect &&
-	git rev-list --format=%s F...I |
-	sed -e "/^commit /d" |
-	sort >actual &&
-	test_cmp expect actual
-'
+test_ancestry "D..M" "E F G H I J K L M"
 
-test_expect_success 'rev-list --ancestry-path F...I' '
-	for c in F H I; do echo $c; done >expect &&
-	git rev-list --ancestry-path --format=%s F...I |
-	sed -e "/^commit /d" |
-	sort >actual &&
-	test_cmp expect actual
-'
+test_ancestry "--ancestry-path D..M" "E F H I J L M"
+test_ancestry "--ancestry-path=F D..M" "E F J L M"
+test_ancestry "--ancestry-path=G D..M" "G H I J L M"
+test_ancestry "--ancestry-path=H D..M" "E G H I J L M"
+test_ancestry "--ancestry-path=K D..M" "K L M"
+test_ancestry "--ancestry-path=F --ancestry-path=K D..M" "E F J K L M"
 
-# G.t is dropped in an "-s ours" merge
-test_expect_success 'rev-list G..M -- G.t' '
-	git rev-list --format=%s G..M -- G.t |
-	sed -e "/^commit /d" >actual &&
-	test_must_be_empty actual
-'
+test_ancestry "D..M -- M.t" "M"
+test_ancestry "--ancestry-path D..M -- M.t" "M"
 
-test_expect_success 'rev-list --ancestry-path G..M -- G.t' '
-	echo L >expect &&
-	git rev-list --ancestry-path --format=%s G..M -- G.t |
-	sed -e "/^commit /d" >actual &&
-	test_cmp expect actual
-'
+test_ancestry "F...I" "F G H I"
+test_ancestry "--ancestry-path F...I" "F H I"
 
-test_expect_success 'rev-list --ancestry-path --simplify-merges G^..M -- G.t' '
-	for c in G L; do echo $c; done >expect &&
-	git rev-list --ancestry-path --simplify-merges --format=%s G^..M -- G.t |
-	sed -e "/^commit /d" |
-	sort >actual &&
-	test_cmp expect actual
-'
+test_ancestry "G..M -- G.t" ""
+test_ancestry "--ancestry-path G..M -- G.t" "L"
+test_ancestry "--ancestry-path --simplify-merges G^..M -- G.t" "G L"
 
 #   b---bc
 #  / \ /
@@ -128,15 +104,15 @@ test_expect_success 'setup criss-cross' '
 	(cd criss-cross &&
 	 git init &&
 	 test_commit A &&
-	 git checkout -b xb master &&
+	 git checkout -b xb main &&
 	 test_commit B &&
-	 git checkout -b xc master &&
+	 git checkout -b xc main &&
 	 test_commit C &&
 	 git checkout -b xbc xb -- &&
 	 git merge xc &&
 	 git checkout -b xcb xc -- &&
 	 git merge xb &&
-	 git checkout master)
+	 git checkout main)
 '
 
 # no commits in bc descend from cb
diff --git a/t/t6020-bundle-misc.sh b/t/t6020-bundle-misc.sh
new file mode 100755
index 0000000..3e6bcbf
--- /dev/null
+++ b/t/t6020-bundle-misc.sh
@@ -0,0 +1,654 @@
+#!/bin/sh
+#
+# Copyright (c) 2021 Jiang Xin
+#
+
+test_description='Test git-bundle'
+
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+. ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-bundle.sh
+. "$TEST_DIRECTORY"/lib-terminal.sh
+
+for cmd in create verify list-heads unbundle
+do
+	test_expect_success "usage: git bundle $cmd needs an argument" '
+		test_expect_code 129 git bundle $cmd
+	'
+done
+
+# Create a commit or tag and set the variable with the object ID.
+test_commit_setvar () {
+	notick=
+	signoff=
+	indir=
+	merge=
+	tag=
+	var=
+
+	while test $# != 0
+	do
+		case "$1" in
+		--merge)
+			merge=t
+			;;
+		--tag)
+			tag=t
+			;;
+		--notick)
+			notick=t
+			;;
+		--signoff)
+			signoff="$1"
+			;;
+		-C)
+			shift
+			indir="$1"
+			;;
+		-*)
+			echo >&2 "error: unknown option $1"
+			return 1
+			;;
+		*)
+			break
+			;;
+		esac
+		shift
+	done
+	if test $# -lt 2
+	then
+		echo >&2 "error: test_commit_setvar must have at least 2 arguments"
+		return 1
+	fi
+	var=$1
+	shift
+	indir=${indir:+"$indir"/}
+	if test -z "$notick"
+	then
+		test_tick
+	fi &&
+	if test -n "$merge"
+	then
+		git ${indir:+ -C "$indir"} merge --no-edit --no-ff \
+			${2:+-m "$2"} "$1" &&
+		oid=$(git ${indir:+ -C "$indir"} rev-parse HEAD)
+	elif test -n "$tag"
+	then
+		git ${indir:+ -C "$indir"} tag -m "$1" "$1" "${2:-HEAD}" &&
+		oid=$(git ${indir:+ -C "$indir"} rev-parse "$1")
+	else
+		file=${2:-"$1.t"} &&
+		echo "${3-$1}" >"$indir$file" &&
+		git ${indir:+ -C "$indir"} add "$file" &&
+		git ${indir:+ -C "$indir"} commit $signoff -m "$1" &&
+		oid=$(git ${indir:+ -C "$indir"} rev-parse HEAD)
+	fi &&
+	eval $var=$oid
+}
+
+get_abbrev_oid () {
+	oid=$1 &&
+	suffix=${oid#???????} &&
+	oid=${oid%$suffix} &&
+	if test -n "$oid"
+	then
+		echo "$oid"
+	else
+		echo "undefined-oid"
+	fi
+}
+
+# Format the output of git commands to make a user-friendly and stable
+# text.  We can easily prepare the expect text without having to worry
+# about future changes of the commit ID.
+make_user_friendly_and_stable_output () {
+	sed \
+		-e "s/$(get_abbrev_oid $A)[0-9a-f]*/<COMMIT-A>/g" \
+		-e "s/$(get_abbrev_oid $B)[0-9a-f]*/<COMMIT-B>/g" \
+		-e "s/$(get_abbrev_oid $C)[0-9a-f]*/<COMMIT-C>/g" \
+		-e "s/$(get_abbrev_oid $D)[0-9a-f]*/<COMMIT-D>/g" \
+		-e "s/$(get_abbrev_oid $E)[0-9a-f]*/<COMMIT-E>/g" \
+		-e "s/$(get_abbrev_oid $F)[0-9a-f]*/<COMMIT-F>/g" \
+		-e "s/$(get_abbrev_oid $G)[0-9a-f]*/<COMMIT-G>/g" \
+		-e "s/$(get_abbrev_oid $H)[0-9a-f]*/<COMMIT-H>/g" \
+		-e "s/$(get_abbrev_oid $I)[0-9a-f]*/<COMMIT-I>/g" \
+		-e "s/$(get_abbrev_oid $J)[0-9a-f]*/<COMMIT-J>/g" \
+		-e "s/$(get_abbrev_oid $K)[0-9a-f]*/<COMMIT-K>/g" \
+		-e "s/$(get_abbrev_oid $L)[0-9a-f]*/<COMMIT-L>/g" \
+		-e "s/$(get_abbrev_oid $M)[0-9a-f]*/<COMMIT-M>/g" \
+		-e "s/$(get_abbrev_oid $N)[0-9a-f]*/<COMMIT-N>/g" \
+		-e "s/$(get_abbrev_oid $O)[0-9a-f]*/<COMMIT-O>/g" \
+		-e "s/$(get_abbrev_oid $P)[0-9a-f]*/<COMMIT-P>/g" \
+		-e "s/$(get_abbrev_oid $TAG1)[0-9a-f]*/<TAG-1>/g" \
+		-e "s/$(get_abbrev_oid $TAG2)[0-9a-f]*/<TAG-2>/g" \
+		-e "s/$(get_abbrev_oid $TAG3)[0-9a-f]*/<TAG-3>/g"
+}
+
+format_and_save_expect () {
+	sed -e 's/Z$//' >expect
+}
+
+HASH_MESSAGE="The bundle uses this hash algorithm: $GIT_DEFAULT_HASH"
+
+#            (C)   (D, pull/1/head, topic/1)
+#             o --- o
+#            /       \                              (L)
+#           /         \        o (H, topic/2)             (M, tag:v2)
+#          /    (F)    \      /                                 (N, tag:v3)
+#         /      o --------- o (G, pull/2/head)      o --- o --- o (release)
+#        /      /        \    \                      /       \
+#  o --- o --- o -------- o -- o ------------------ o ------- o --- o (main)
+# (A)   (B)  (E, tag:v1) (I)  (J)                  (K)       (O)   (P)
+#
+test_expect_success 'setup' '
+	# Try to make a stable fixed width for abbreviated commit ID,
+	# this fixed-width oid will be replaced with "<OID>".
+	git config core.abbrev 7 &&
+
+	# branch main: commit A & B
+	test_commit_setvar A "Commit A" main.txt &&
+	test_commit_setvar B "Commit B" main.txt &&
+
+	# branch topic/1: commit C & D, refs/pull/1/head
+	git checkout -b topic/1 &&
+	test_commit_setvar C "Commit C" topic-1.txt &&
+	test_commit_setvar D "Commit D" topic-1.txt &&
+	git update-ref refs/pull/1/head HEAD &&
+
+	# branch topic/1: commit E, tag v1
+	git checkout main &&
+	test_commit_setvar E "Commit E" main.txt &&
+	test_commit_setvar --tag TAG1 v1 &&
+
+	# branch topic/2: commit F & G, refs/pull/2/head
+	git checkout -b topic/2 &&
+	test_commit_setvar F "Commit F" topic-2.txt &&
+	test_commit_setvar G "Commit G" topic-2.txt &&
+	git update-ref refs/pull/2/head HEAD &&
+	test_commit_setvar H "Commit H" topic-2.txt &&
+
+	# branch main: merge commit I & J
+	git checkout main &&
+	test_commit_setvar --merge I topic/1 "Merge commit I" &&
+	test_commit_setvar --merge J refs/pull/2/head "Merge commit J" &&
+
+	# branch main: commit K
+	git checkout main &&
+	test_commit_setvar K "Commit K" main.txt &&
+
+	# branch release:
+	git checkout -b release &&
+	test_commit_setvar L "Commit L" release.txt &&
+	test_commit_setvar M "Commit M" release.txt &&
+	test_commit_setvar --tag TAG2 v2 &&
+	test_commit_setvar N "Commit N" release.txt &&
+	test_commit_setvar --tag TAG3 v3 &&
+
+	# branch main: merge commit O, commit P
+	git checkout main &&
+	test_commit_setvar --merge O tags/v2 "Merge commit O" &&
+	test_commit_setvar P "Commit P" main.txt
+'
+
+test_expect_success 'create bundle from special rev: main^!' '
+	git bundle create special-rev.bdl "main^!" &&
+
+	git bundle list-heads special-rev.bdl |
+		make_user_friendly_and_stable_output >actual &&
+	cat >expect <<-\EOF &&
+	<COMMIT-P> refs/heads/main
+	EOF
+	test_cmp expect actual &&
+
+	git bundle verify special-rev.bdl |
+		make_user_friendly_and_stable_output >actual &&
+	format_and_save_expect <<-EOF &&
+	The bundle contains this ref:
+	<COMMIT-P> refs/heads/main
+	The bundle requires this ref:
+	<COMMIT-O> Z
+	$HASH_MESSAGE
+	EOF
+	test_cmp expect actual &&
+
+	test_bundle_object_count special-rev.bdl 3
+'
+
+test_expect_success 'create bundle with --max-count option' '
+	git bundle create max-count.bdl --max-count 1 \
+		main \
+		"^release" \
+		refs/tags/v1 \
+		refs/pull/1/head \
+		refs/pull/2/head &&
+
+	git bundle verify max-count.bdl |
+		make_user_friendly_and_stable_output >actual &&
+	format_and_save_expect <<-EOF &&
+	The bundle contains these 2 refs:
+	<COMMIT-P> refs/heads/main
+	<TAG-1> refs/tags/v1
+	The bundle requires this ref:
+	<COMMIT-O> Z
+	$HASH_MESSAGE
+	EOF
+	test_cmp expect actual &&
+
+	test_bundle_object_count max-count.bdl 4
+'
+
+test_expect_success 'create bundle with --since option' '
+	git log -1 --pretty="%ad" $M >actual &&
+	cat >expect <<-\EOF &&
+	Thu Apr 7 15:26:13 2005 -0700
+	EOF
+	test_cmp expect actual &&
+
+	git bundle create since.bdl \
+		--since "Thu Apr 7 15:27:00 2005 -0700" \
+		--all &&
+
+	git bundle verify since.bdl |
+		make_user_friendly_and_stable_output >actual &&
+	format_and_save_expect <<-EOF &&
+	The bundle contains these 5 refs:
+	<COMMIT-P> refs/heads/main
+	<COMMIT-N> refs/heads/release
+	<TAG-2> refs/tags/v2
+	<TAG-3> refs/tags/v3
+	<COMMIT-P> HEAD
+	The bundle requires these 2 refs:
+	<COMMIT-M> Z
+	<COMMIT-K> Z
+	$HASH_MESSAGE
+	EOF
+	test_cmp expect actual &&
+
+	test_bundle_object_count --thin since.bdl 13
+'
+
+test_expect_success 'create bundle 1 - no prerequisites' '
+	# create bundle from args
+	git bundle create 1.bdl topic/1 topic/2 &&
+
+	# create bundle from stdin
+	cat >input <<-\EOF &&
+	topic/1
+	topic/2
+	EOF
+	git bundle create stdin-1.bdl --stdin <input &&
+
+	format_and_save_expect <<-EOF &&
+	The bundle contains these 2 refs:
+	<COMMIT-D> refs/heads/topic/1
+	<COMMIT-H> refs/heads/topic/2
+	The bundle records a complete history.
+	$HASH_MESSAGE
+	EOF
+
+	# verify bundle, which has no prerequisites
+	git bundle verify 1.bdl |
+		make_user_friendly_and_stable_output >actual &&
+	test_cmp expect actual &&
+
+	git bundle verify stdin-1.bdl |
+		make_user_friendly_and_stable_output >actual &&
+	test_cmp expect actual &&
+
+	test_bundle_object_count       1.bdl 24 &&
+	test_bundle_object_count stdin-1.bdl 24
+'
+
+test_expect_success 'create bundle 2 - has prerequisites' '
+	# create bundle from args
+	git bundle create 2.bdl \
+		--ignore-missing \
+		^topic/deleted \
+		^$D \
+		^topic/2 \
+		release &&
+
+	# create bundle from stdin
+	# input has a non-exist reference: "topic/deleted"
+	cat >input <<-EOF &&
+	^topic/deleted
+	^$D
+	^topic/2
+	EOF
+	git bundle create stdin-2.bdl \
+		--ignore-missing \
+		--stdin \
+		release <input &&
+
+	format_and_save_expect <<-EOF &&
+	The bundle contains this ref:
+	<COMMIT-N> refs/heads/release
+	The bundle requires these 3 refs:
+	<COMMIT-D> Z
+	<COMMIT-E> Z
+	<COMMIT-G> Z
+	$HASH_MESSAGE
+	EOF
+
+	git bundle verify 2.bdl |
+		make_user_friendly_and_stable_output >actual &&
+	test_cmp expect actual &&
+
+	git bundle verify stdin-2.bdl |
+		make_user_friendly_and_stable_output >actual &&
+	test_cmp expect actual &&
+
+	test_bundle_object_count       2.bdl 16 &&
+	test_bundle_object_count stdin-2.bdl 16
+'
+
+test_expect_success 'fail to verify bundle without prerequisites' '
+	git init --bare test1.git &&
+
+	format_and_save_expect <<-\EOF &&
+	error: Repository lacks these prerequisite commits:
+	error: <COMMIT-D> Z
+	error: <COMMIT-E> Z
+	error: <COMMIT-G> Z
+	EOF
+
+	test_must_fail git -C test1.git bundle verify ../2.bdl 2>&1 |
+		make_user_friendly_and_stable_output >actual &&
+	test_cmp expect actual &&
+
+	test_must_fail git -C test1.git bundle verify ../stdin-2.bdl 2>&1 |
+		make_user_friendly_and_stable_output >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'create bundle 3 - two refs, same object' '
+	# create bundle from args
+	git bundle create --version=3 3.bdl \
+		^release \
+		^topic/1 \
+		^topic/2 \
+		main \
+		HEAD &&
+
+	# create bundle from stdin
+	cat >input <<-\EOF &&
+	^release
+	^topic/1
+	^topic/2
+	EOF
+	git bundle create --version=3 stdin-3.bdl \
+		--stdin \
+		main HEAD <input &&
+
+	format_and_save_expect <<-EOF &&
+	The bundle contains these 2 refs:
+	<COMMIT-P> refs/heads/main
+	<COMMIT-P> HEAD
+	The bundle requires these 2 refs:
+	<COMMIT-M> Z
+	<COMMIT-K> Z
+	$HASH_MESSAGE
+	EOF
+
+	git bundle verify 3.bdl |
+		make_user_friendly_and_stable_output >actual &&
+	test_cmp expect actual &&
+
+	git bundle verify stdin-3.bdl |
+		make_user_friendly_and_stable_output >actual &&
+	test_cmp expect actual &&
+
+	test_bundle_object_count       3.bdl 4 &&
+	test_bundle_object_count stdin-3.bdl 4
+'
+
+test_expect_success 'create bundle 4 - with tags' '
+	# create bundle from args
+	git bundle create 4.bdl \
+		^main \
+		^release \
+		^topic/1 \
+		^topic/2 \
+		--all &&
+
+	# create bundle from stdin
+	cat >input <<-\EOF &&
+	^main
+	^release
+	^topic/1
+	^topic/2
+	EOF
+	git bundle create stdin-4.bdl \
+		--ignore-missing \
+		--stdin \
+		--all <input &&
+
+	cat >expect <<-EOF &&
+	The bundle contains these 3 refs:
+	<TAG-1> refs/tags/v1
+	<TAG-2> refs/tags/v2
+	<TAG-3> refs/tags/v3
+	The bundle records a complete history.
+	$HASH_MESSAGE
+	EOF
+
+	git bundle verify 4.bdl |
+		make_user_friendly_and_stable_output >actual &&
+	test_cmp expect actual &&
+
+	git bundle verify stdin-4.bdl |
+		make_user_friendly_and_stable_output >actual &&
+	test_cmp expect actual &&
+
+	test_bundle_object_count       4.bdl 3 &&
+	test_bundle_object_count stdin-4.bdl 3
+'
+
+test_expect_success 'clone from bundle' '
+	git clone --mirror 1.bdl mirror.git &&
+	git -C mirror.git show-ref |
+		make_user_friendly_and_stable_output >actual &&
+	cat >expect <<-\EOF &&
+	<COMMIT-D> refs/heads/topic/1
+	<COMMIT-H> refs/heads/topic/2
+	EOF
+	test_cmp expect actual &&
+
+	git -C mirror.git fetch ../2.bdl "+refs/*:refs/*" &&
+	git -C mirror.git show-ref |
+		make_user_friendly_and_stable_output >actual &&
+	cat >expect <<-\EOF &&
+	<COMMIT-N> refs/heads/release
+	<COMMIT-D> refs/heads/topic/1
+	<COMMIT-H> refs/heads/topic/2
+	EOF
+	test_cmp expect actual &&
+
+	git -C mirror.git fetch ../3.bdl "+refs/*:refs/*" &&
+	git -C mirror.git show-ref |
+		make_user_friendly_and_stable_output >actual &&
+	cat >expect <<-\EOF &&
+	<COMMIT-P> refs/heads/main
+	<COMMIT-N> refs/heads/release
+	<COMMIT-D> refs/heads/topic/1
+	<COMMIT-H> refs/heads/topic/2
+	EOF
+	test_cmp expect actual &&
+
+	git -C mirror.git fetch ../4.bdl "+refs/*:refs/*" &&
+	git -C mirror.git show-ref |
+		make_user_friendly_and_stable_output >actual &&
+	cat >expect <<-\EOF &&
+	<COMMIT-P> refs/heads/main
+	<COMMIT-N> refs/heads/release
+	<COMMIT-D> refs/heads/topic/1
+	<COMMIT-H> refs/heads/topic/2
+	<TAG-1> refs/tags/v1
+	<TAG-2> refs/tags/v2
+	<TAG-3> refs/tags/v3
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'unfiltered bundle with --objects' '
+	git bundle create all-objects.bdl \
+		--all --objects &&
+	git bundle create all.bdl \
+		--all &&
+
+	# Compare the headers of these files.
+	sed -n -e "/^$/q" -e "p" all.bdl >expect &&
+	sed -n -e "/^$/q" -e "p" all-objects.bdl >actual &&
+	test_cmp expect actual
+'
+
+for filter in "blob:none" "tree:0" "tree:1" "blob:limit=100"
+do
+	test_expect_success "filtered bundle: $filter" '
+		test_when_finished rm -rf .git/objects/pack cloned unbundled &&
+		git bundle create partial.bdl \
+			--all \
+			--filter=$filter &&
+
+		git bundle verify partial.bdl >unfiltered &&
+		make_user_friendly_and_stable_output <unfiltered >actual &&
+
+		cat >expect <<-EOF &&
+		The bundle contains these 10 refs:
+		<COMMIT-P> refs/heads/main
+		<COMMIT-N> refs/heads/release
+		<COMMIT-D> refs/heads/topic/1
+		<COMMIT-H> refs/heads/topic/2
+		<COMMIT-D> refs/pull/1/head
+		<COMMIT-G> refs/pull/2/head
+		<TAG-1> refs/tags/v1
+		<TAG-2> refs/tags/v2
+		<TAG-3> refs/tags/v3
+		<COMMIT-P> HEAD
+		The bundle records a complete history.
+		$HASH_MESSAGE
+		The bundle uses this filter: $filter
+		EOF
+		test_cmp expect actual &&
+
+		test_config uploadpack.allowfilter 1 &&
+		test_config uploadpack.allowanysha1inwant 1 &&
+		git clone --no-local --filter=$filter --bare "file://$(pwd)" cloned &&
+
+		git init unbundled &&
+		git -C unbundled bundle unbundle ../partial.bdl >ref-list.txt &&
+		ls unbundled/.git/objects/pack/pack-*.promisor >promisor &&
+		test_line_count = 1 promisor &&
+
+		# Count the same number of reachable objects.
+		reflist=$(git for-each-ref --format="%(objectname)") &&
+		git rev-list --objects --filter=$filter --missing=allow-any \
+			$reflist >expect &&
+		for repo in cloned unbundled
+		do
+			git -C $repo rev-list --objects --missing=allow-any \
+				$reflist >actual &&
+			test_cmp expect actual || return 1
+		done
+	'
+done
+
+# NEEDSWORK: 'git clone --bare' should be able to clone from a filtered
+# bundle, but that requires a change to promisor/filter config options.
+# For now, we fail gracefully with a helpful error. This behavior can be
+# changed in the future to succeed as much as possible.
+test_expect_success 'cloning from filtered bundle has useful error' '
+	git bundle create partial.bdl \
+		--all \
+		--filter=blob:none &&
+	test_must_fail git clone --bare partial.bdl partial 2>err &&
+	grep "cannot clone from filtered bundle" err
+'
+
+test_expect_success 'verify catches unreachable, broken prerequisites' '
+	test_when_finished rm -rf clone-from clone-to &&
+	git init clone-from &&
+	(
+		cd clone-from &&
+		git checkout -b base &&
+		test_commit A &&
+		git checkout -b tip &&
+		git commit --allow-empty -m "will drop by shallow" &&
+		git commit --allow-empty -m "will keep by shallow" &&
+		git commit --allow-empty -m "for bundle, not clone" &&
+		git bundle create tip.bundle tip~1..tip &&
+		git reset --hard HEAD~1 &&
+		git checkout base
+	) &&
+	BAD_OID=$(git -C clone-from rev-parse tip~1) &&
+	TIP_OID=$(git -C clone-from rev-parse tip) &&
+	git clone --depth=1 --no-single-branch \
+		"file://$(pwd)/clone-from" clone-to &&
+	(
+		cd clone-to &&
+
+		# Set up broken history by removing shallow markers
+		git update-ref -d refs/remotes/origin/tip &&
+		rm .git/shallow &&
+
+		# Verify should fail
+		test_must_fail git bundle verify \
+			../clone-from/tip.bundle 2>err &&
+		grep "some prerequisite commits .* are not connected" err &&
+		test_line_count = 1 err &&
+
+		# Unbundling should fail
+		test_must_fail git bundle unbundle \
+			../clone-from/tip.bundle 2>err &&
+		grep "some prerequisite commits .* are not connected" err &&
+		test_line_count = 1 err
+	)
+'
+
+test_expect_success 'bundle progress includes write phase' '
+	GIT_PROGRESS_DELAY=0 \
+		git bundle create --progress out.bundle --all 2>err &&
+	grep 'Writing' err
+'
+
+test_expect_success TTY 'create --quiet disables all bundle progress' '
+	test_terminal env GIT_PROGRESS_DELAY=0 \
+		git bundle create --quiet out.bundle --all 2>err &&
+	test_must_be_empty err
+'
+
+test_expect_success 'bundle progress with --no-quiet' '
+	GIT_PROGRESS_DELAY=0 \
+		git bundle create --no-quiet out.bundle --all 2>err &&
+	grep "%" err
+'
+
+test_expect_success 'read bundle over stdin' '
+	git bundle create some.bundle HEAD &&
+
+	git bundle verify - <some.bundle 2>err &&
+	grep "<stdin> is okay" err &&
+
+	git bundle list-heads some.bundle >expect &&
+	git bundle list-heads - <some.bundle >actual &&
+	test_cmp expect actual &&
+
+	git bundle unbundle some.bundle >expect &&
+	git bundle unbundle - <some.bundle >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'send a bundle to standard output' '
+	git bundle create - --all HEAD >bundle-one &&
+	mkdir -p down &&
+	git -C down bundle create - --all HEAD >bundle-two &&
+	git bundle verify bundle-one &&
+	git bundle verify bundle-two &&
+	git ls-remote bundle-one >expect &&
+	git ls-remote bundle-two >actual &&
+	test_cmp expect actual
+'
+
+test_done
diff --git a/t/t6021-rev-list-exclude-hidden.sh b/t/t6021-rev-list-exclude-hidden.sh
new file mode 100755
index 0000000..51df021
--- /dev/null
+++ b/t/t6021-rev-list-exclude-hidden.sh
@@ -0,0 +1,164 @@
+#!/bin/sh
+
+test_description='git rev-list --exclude-hidden test'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+test_expect_success 'setup' '
+	test_commit_bulk --id=commit --ref=refs/heads/branch 1 &&
+	COMMIT=$(git rev-parse refs/heads/branch) &&
+	test_commit_bulk --id=tag --ref=refs/tags/lightweight 1 &&
+	TAG=$(git rev-parse refs/tags/lightweight) &&
+	test_commit_bulk --id=hidden --ref=refs/hidden/commit 1 &&
+	HIDDEN=$(git rev-parse refs/hidden/commit) &&
+	test_commit_bulk --id=namespace --ref=refs/namespaces/namespace/refs/namespaced/commit 1 &&
+	NAMESPACE=$(git rev-parse refs/namespaces/namespace/refs/namespaced/commit)
+'
+
+test_expect_success 'invalid section' '
+	echo "fatal: unsupported section for hidden refs: unsupported" >expected &&
+	test_must_fail git rev-list --exclude-hidden=unsupported 2>err &&
+	test_cmp expected err
+'
+
+for section in fetch receive uploadpack
+do
+	test_expect_success "$section: passed multiple times" '
+		echo "fatal: --exclude-hidden= passed more than once" >expected &&
+		test_must_fail git rev-list --exclude-hidden=$section --exclude-hidden=$section 2>err &&
+		test_cmp expected err
+	'
+
+	test_expect_success "$section: without hiddenRefs" '
+		git rev-list --exclude-hidden=$section --all >out &&
+		cat >expected <<-EOF &&
+		$NAMESPACE
+		$HIDDEN
+		$TAG
+		$COMMIT
+		EOF
+		test_cmp expected out
+	'
+
+	test_expect_success "$section: hidden via transfer.hideRefs" '
+		git -c transfer.hideRefs=refs/hidden/ rev-list --exclude-hidden=$section --all >out &&
+		cat >expected <<-EOF &&
+		$NAMESPACE
+		$TAG
+		$COMMIT
+		EOF
+		test_cmp expected out
+	'
+
+	test_expect_success "$section: hidden via $section.hideRefs" '
+		git -c $section.hideRefs=refs/hidden/ rev-list --exclude-hidden=$section --all >out &&
+		cat >expected <<-EOF &&
+		$NAMESPACE
+		$TAG
+		$COMMIT
+		EOF
+		test_cmp expected out
+	'
+
+	test_expect_success "$section: respects both transfer.hideRefs and $section.hideRefs" '
+		git -c transfer.hideRefs=refs/tags/ -c $section.hideRefs=refs/hidden/ rev-list --exclude-hidden=$section --all >out &&
+		cat >expected <<-EOF &&
+		$NAMESPACE
+		$COMMIT
+		EOF
+		test_cmp expected out
+	'
+
+	test_expect_success "$section: negation without hidden refs marks everything as uninteresting" '
+		git rev-list --all --exclude-hidden=$section --not --all >out &&
+		test_must_be_empty out
+	'
+
+	test_expect_success "$section: negation with hidden refs marks them as interesting" '
+		git -c transfer.hideRefs=refs/hidden/ rev-list --all --exclude-hidden=$section --not --all >out &&
+		cat >expected <<-EOF &&
+		$HIDDEN
+		EOF
+		test_cmp expected out
+	'
+
+	test_expect_success "$section: hidden refs and excludes work together" '
+		git -c transfer.hideRefs=refs/hidden/ rev-list --exclude=refs/tags/* --exclude-hidden=$section --all >out &&
+		cat >expected <<-EOF &&
+		$NAMESPACE
+		$COMMIT
+		EOF
+		test_cmp expected out
+	'
+
+	test_expect_success "$section: excluded hidden refs get reset" '
+		git -c transfer.hideRefs=refs/ rev-list --exclude-hidden=$section --all --all >out &&
+		cat >expected <<-EOF &&
+		$NAMESPACE
+		$HIDDEN
+		$TAG
+		$COMMIT
+		EOF
+		test_cmp expected out
+	'
+
+	test_expect_success "$section: excluded hidden refs can be used with multiple pseudo-refs" '
+		git -c transfer.hideRefs=refs/ rev-list --exclude-hidden=$section --all --exclude-hidden=$section --all >out &&
+		test_must_be_empty out
+	'
+
+	test_expect_success "$section: works with --glob" '
+		git -c transfer.hideRefs=refs/hidden/ rev-list --exclude-hidden=$section --glob=refs/h* >out &&
+		cat >expected <<-EOF &&
+		$COMMIT
+		EOF
+		test_cmp expected out
+	'
+
+	test_expect_success "$section: operates on stripped refs by default" '
+		GIT_NAMESPACE=namespace git -c transfer.hideRefs=refs/namespaced/ rev-list --exclude-hidden=$section --all >out &&
+		cat >expected <<-EOF &&
+		$HIDDEN
+		$TAG
+		$COMMIT
+		EOF
+		test_cmp expected out
+	'
+
+	test_expect_success "$section: does not hide namespace by default" '
+		GIT_NAMESPACE=namespace git -c transfer.hideRefs=refs/namespaces/namespace/ rev-list --exclude-hidden=$section --all >out &&
+		cat >expected <<-EOF &&
+		$NAMESPACE
+		$HIDDEN
+		$TAG
+		$COMMIT
+		EOF
+		test_cmp expected out
+	'
+
+	test_expect_success "$section: can operate on unstripped refs" '
+		GIT_NAMESPACE=namespace git -c transfer.hideRefs=^refs/namespaces/namespace/ rev-list --exclude-hidden=$section --all >out &&
+		cat >expected <<-EOF &&
+		$HIDDEN
+		$TAG
+		$COMMIT
+		EOF
+		test_cmp expected out
+	'
+
+	for pseudoopt in remotes branches tags
+	do
+		test_expect_success "$section: fails with --$pseudoopt" '
+			test_must_fail git rev-list --exclude-hidden=$section --$pseudoopt 2>err &&
+			test_grep "error: options .--exclude-hidden. and .--$pseudoopt. cannot be used together" err
+		'
+
+		test_expect_success "$section: fails with --$pseudoopt=pattern" '
+			test_must_fail git rev-list --exclude-hidden=$section --$pseudoopt=pattern 2>err &&
+			test_grep "error: options .--exclude-hidden. and .--$pseudoopt. cannot be used together" err
+		'
+	done
+done
+
+test_done
diff --git a/t/t6022-rev-list-missing.sh b/t/t6022-rev-list-missing.sh
new file mode 100755
index 0000000..127180e
--- /dev/null
+++ b/t/t6022-rev-list-missing.sh
@@ -0,0 +1,149 @@
+#!/bin/sh
+
+test_description='handling of missing objects in rev-list'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+# We setup the repository with two commits, this way HEAD is always
+# available and we can hide commit 1.
+test_expect_success 'create repository and alternate directory' '
+	test_commit 1 &&
+	test_commit 2 &&
+	test_commit 3 &&
+	git tag -m "tag message" annot_tag HEAD~1 &&
+	git tag regul_tag HEAD~1 &&
+	git branch a_branch HEAD~1
+'
+
+# We manually corrupt the repository, which means that the commit-graph may
+# contain references to already-deleted objects. We thus need to enable
+# commit-graph paranoia to not returned these deleted commits from the graph.
+GIT_COMMIT_GRAPH_PARANOIA=true
+export GIT_COMMIT_GRAPH_PARANOIA
+
+for obj in "HEAD~1" "HEAD~1^{tree}" "HEAD:1.t"
+do
+	test_expect_success "rev-list --missing=error fails with missing object $obj" '
+		oid="$(git rev-parse $obj)" &&
+		path=".git/objects/$(test_oid_to_path $oid)" &&
+
+		mv "$path" "$path.hidden" &&
+		test_when_finished "mv $path.hidden $path" &&
+
+		test_must_fail git rev-list --missing=error --objects \
+			--no-object-names HEAD
+	'
+done
+
+for obj in "HEAD~1" "HEAD~1^{tree}" "HEAD:1.t"
+do
+	for action in "allow-any" "print"
+	do
+		test_expect_success "rev-list --missing=$action with missing $obj" '
+			oid="$(git rev-parse $obj)" &&
+			path=".git/objects/$(test_oid_to_path $oid)" &&
+
+			# Before the object is made missing, we use rev-list to
+			# get the expected oids.
+			git rev-list --objects --no-object-names \
+				HEAD ^$obj >expect.raw &&
+
+			# Blobs are shared by all commits, so even though a commit/tree
+			# might be skipped, its blob must be accounted for.
+			if test $obj != "HEAD:1.t"
+			then
+				echo $(git rev-parse HEAD:1.t) >>expect.raw &&
+				echo $(git rev-parse HEAD:2.t) >>expect.raw
+			fi &&
+
+			mv "$path" "$path.hidden" &&
+			test_when_finished "mv $path.hidden $path" &&
+
+			git rev-list --missing=$action --objects --no-object-names \
+				HEAD >actual.raw &&
+
+			# When the action is to print, we should also add the missing
+			# oid to the expect list.
+			case $action in
+			allow-any)
+				;;
+			print)
+				grep ?$oid actual.raw &&
+				echo ?$oid >>expect.raw
+				;;
+			esac &&
+
+			sort actual.raw >actual &&
+			sort expect.raw >expect &&
+			test_cmp expect actual
+		'
+	done
+done
+
+for missing_tip in "annot_tag" "regul_tag" "a_branch" "HEAD~1" "HEAD~1^{tree}" "HEAD:1.t"
+do
+	# We want to check that things work when both
+	#   - all the tips passed are missing (case existing_tip = ""), and
+	#   - there is one missing tip and one existing tip (case existing_tip = "HEAD")
+	for existing_tip in "" "HEAD"
+	do
+		for action in "allow-any" "print"
+		do
+			test_expect_success "--missing=$action with tip '$missing_tip' missing and tip '$existing_tip'" '
+				# Before the object is made missing, we use rev-list to
+				# get the expected oids.
+				if test "$existing_tip" = "HEAD"
+				then
+					git rev-list --objects --no-object-names \
+						HEAD ^$missing_tip >expect.raw
+				else
+					>expect.raw
+				fi &&
+
+				# Blobs are shared by all commits, so even though a commit/tree
+				# might be skipped, its blob must be accounted for.
+				if test "$existing_tip" = "HEAD" && test $missing_tip != "HEAD:1.t"
+				then
+					echo $(git rev-parse HEAD:1.t) >>expect.raw &&
+					echo $(git rev-parse HEAD:2.t) >>expect.raw
+				fi &&
+
+				missing_oid="$(git rev-parse $missing_tip)" &&
+
+				if test "$missing_tip" = "annot_tag"
+				then
+					oid="$(git rev-parse $missing_tip^{commit})" &&
+					echo "$missing_oid" >>expect.raw
+				else
+					oid="$missing_oid"
+				fi &&
+
+				path=".git/objects/$(test_oid_to_path $oid)" &&
+
+				mv "$path" "$path.hidden" &&
+				test_when_finished "mv $path.hidden $path" &&
+
+				git rev-list --missing=$action --objects --no-object-names \
+				     $missing_oid $existing_tip >actual.raw &&
+
+				# When the action is to print, we should also add the missing
+				# oid to the expect list.
+				case $action in
+				allow-any)
+					;;
+				print)
+					grep ?$oid actual.raw &&
+					echo ?$oid >>expect.raw
+					;;
+				esac &&
+
+				sort actual.raw >actual &&
+				sort expect.raw >expect &&
+				test_cmp expect actual
+			'
+		done
+	done
+done
+
+test_done
diff --git a/t/t6030-bisect-porcelain.sh b/t/t6030-bisect-porcelain.sh
index 36d9b2b..cdc0270 100755
--- a/t/t6030-bisect-porcelain.sh
+++ b/t/t6030-bisect-porcelain.sh
@@ -6,6 +6,9 @@ test_description='Tests git bisect functionality'
 
 exec </dev/null
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 add_line_into_file()
@@ -31,6 +34,36 @@ HASH2=
 HASH3=
 HASH4=
 
+test_bisect_usage () {
+	local code="$1" &&
+	shift &&
+	cat >expect &&
+	test_expect_code $code "$@" >out 2>actual &&
+	test_must_be_empty out &&
+	test_cmp expect actual
+}
+
+test_expect_success 'bisect usage' "
+	test_bisect_usage 1 git bisect reset extra1 extra2 <<-\EOF &&
+	error: 'git bisect reset' requires either no argument or a commit
+	EOF
+	test_bisect_usage 1 git bisect terms extra1 extra2 <<-\EOF &&
+	error: 'git bisect terms' requires 0 or 1 argument
+	EOF
+	test_bisect_usage 1 git bisect next extra1 <<-\EOF &&
+	error: 'git bisect next' requires 0 arguments
+	EOF
+	test_bisect_usage 1 git bisect log extra1 <<-\EOF &&
+	error: We are not bisecting.
+	EOF
+	test_bisect_usage 1 git bisect replay <<-\EOF &&
+	error: no logfile given
+	EOF
+	test_bisect_usage 1 git bisect run <<-\EOF
+	error: 'git bisect run' failed: no command provided.
+	EOF
+"
+
 test_expect_success 'set up basic repo with 1 file (hello) and 4 commits' '
      add_line_into_file "1: Hello World" hello &&
      HASH1=$(git rev-parse --verify HEAD) &&
@@ -82,9 +115,39 @@ test_expect_success 'bisect fails if given any junk instead of revs' '
 	git bisect bad $HASH4
 '
 
-test_expect_success 'bisect reset: back in the master branch' '
+test_expect_success 'bisect start without -- takes unknown arg as pathspec' '
+	git bisect reset &&
+	git bisect start foo bar &&
+	grep foo ".git/BISECT_NAMES" &&
+	grep bar ".git/BISECT_NAMES"
+'
+
+test_expect_success 'bisect reset: back in a branch checked out also elsewhere' '
+	echo "shared" > branch.expect &&
+	test_bisect_reset() {
+		git -C $1 bisect start &&
+		git -C $1 bisect good $HASH1 &&
+		git -C $1 bisect bad $HASH3 &&
+		git -C $1 bisect reset &&
+		git -C $1 branch --show-current > branch.output &&
+		cmp branch.expect branch.output
+	} &&
+	test_when_finished "
+		git worktree remove wt1 &&
+		git worktree remove wt2 &&
+		git branch -d shared
+	" &&
+	git worktree add wt1 -b shared &&
+	git worktree add wt2 -f shared &&
+	# we test in both worktrees to ensure that works
+	# as expected with "first" and "next" worktrees
+	test_bisect_reset wt1 &&
+	test_bisect_reset wt2
+'
+
+test_expect_success 'bisect reset: back in the main branch' '
 	git bisect reset &&
-	echo "* master" > branch.expect &&
+	echo "* main" > branch.expect &&
 	git branch > branch.output &&
 	cmp branch.expect branch.output
 '
@@ -95,7 +158,7 @@ test_expect_success 'bisect reset: back in another branch' '
 	git bisect good $HASH1 &&
 	git bisect bad $HASH3 &&
 	git bisect reset &&
-	echo "  master" > branch.expect &&
+	echo "  main" > branch.expect &&
 	echo "* other" >> branch.expect &&
 	git branch > branch.output &&
 	cmp branch.expect branch.output
@@ -107,6 +170,12 @@ test_expect_success 'bisect reset when not bisecting' '
 	cmp branch.expect branch.output
 '
 
+test_expect_success 'bisect reset cleans up even when not bisecting' '
+	echo garbage >.git/BISECT_LOG &&
+	git bisect reset &&
+	test_path_is_missing .git/BISECT_LOG
+'
+
 test_expect_success 'bisect reset removes packed refs' '
 	git bisect reset &&
 	git bisect start &&
@@ -157,7 +226,7 @@ test_expect_success 'bisect start: existing ".git/BISECT_START" not modified if
 	cp .git/BISECT_START saved &&
 	test_must_fail git bisect start $HASH4 foo -- &&
 	git branch > branch.output &&
-	test_i18ngrep "* (no branch, bisect started on other)" branch.output > /dev/null &&
+	test_grep "* (no branch, bisect started on other)" branch.output > /dev/null &&
 	test_cmp saved .git/BISECT_START
 '
 test_expect_success 'bisect start: no ".git/BISECT_START" if mistaken rev' '
@@ -242,33 +311,204 @@ test_expect_success 'bisect skip: with commit both bad and skipped' '
 	grep $HASH4 my_bisect_log.txt
 '
 
+test_bisect_run_args () {
+	test_when_finished "rm -f run.sh actual" &&
+	>actual &&
+	cat >expect.args &&
+	cat <&6 >expect.out &&
+	cat <&7 >expect.err &&
+	write_script run.sh <<-\EOF &&
+	while test $# != 0
+	do
+		echo "<$1>" &&
+		shift
+	done >actual.args
+	EOF
+
+	test_when_finished "git bisect reset" &&
+	git bisect start &&
+	git bisect good $HASH1 &&
+	git bisect bad $HASH4 &&
+	git bisect run ./run.sh $@ >actual.out.raw 2>actual.err &&
+	# Prune just the log output
+	sed -n \
+		-e '/^Author:/d' \
+		-e '/^Date:/d' \
+		-e '/^$/d' \
+		-e '/^commit /d' \
+		-e '/^ /d' \
+		-e 'p' \
+		<actual.out.raw >actual.out &&
+	test_cmp expect.out actual.out &&
+	test_cmp expect.err actual.err &&
+	test_cmp expect.args actual.args
+}
+
+test_expect_success 'git bisect run: args, stdout and stderr with no arguments' "
+	test_bisect_run_args <<-'EOF_ARGS' 6<<-EOF_OUT 7<<-'EOF_ERR'
+	EOF_ARGS
+	running './run.sh'
+	$HASH4 is the first bad commit
+	bisect found first bad commit
+	EOF_OUT
+	EOF_ERR
+"
+
+test_expect_success 'git bisect run: args, stdout and stderr: "--" argument' "
+	test_bisect_run_args -- <<-'EOF_ARGS' 6<<-EOF_OUT 7<<-'EOF_ERR'
+	<-->
+	EOF_ARGS
+	running './run.sh' '--'
+	$HASH4 is the first bad commit
+	bisect found first bad commit
+	EOF_OUT
+	EOF_ERR
+"
+
+test_expect_success 'git bisect run: args, stdout and stderr: "--log foo --no-log bar" arguments' "
+	test_bisect_run_args --log foo --no-log bar <<-'EOF_ARGS' 6<<-EOF_OUT 7<<-'EOF_ERR'
+	<--log>
+	<foo>
+	<--no-log>
+	<bar>
+	EOF_ARGS
+	running './run.sh' '--log' 'foo' '--no-log' 'bar'
+	$HASH4 is the first bad commit
+	bisect found first bad commit
+	EOF_OUT
+	EOF_ERR
+"
+
+test_expect_success 'git bisect run: args, stdout and stderr: "--bisect-start" argument' "
+	test_bisect_run_args --bisect-start <<-'EOF_ARGS' 6<<-EOF_OUT 7<<-'EOF_ERR'
+	<--bisect-start>
+	EOF_ARGS
+	running './run.sh' '--bisect-start'
+	$HASH4 is the first bad commit
+	bisect found first bad commit
+	EOF_OUT
+	EOF_ERR
+"
+
+test_expect_success 'git bisect run: negative exit code' "
+	write_script fail.sh <<-'EOF' &&
+	exit 255
+	EOF
+	cat <<-'EOF' >expect &&
+	bisect run failed: exit code -1 from './fail.sh' is < 0 or >= 128
+	EOF
+	test_when_finished 'git bisect reset' &&
+	git bisect start &&
+	git bisect good $HASH1 &&
+	git bisect bad $HASH4 &&
+	! git bisect run ./fail.sh 2>err &&
+	sed -En 's/.*(bisect.*code) (-?[0-9]+) (from.*)/\1 -1 \3/p' err >actual &&
+	test_cmp expect actual
+"
+
+test_expect_success 'git bisect run: unable to verify on good' "
+	write_script fail.sh <<-'EOF' &&
+	head=\$(git rev-parse --verify HEAD)
+	good=\$(git rev-parse --verify $HASH1)
+	if test "\$head" = "\$good"
+	then
+		exit 255
+	else
+		exit 127
+	fi
+	EOF
+	cat <<-'EOF' >expect &&
+	unable to verify './fail.sh' on good revision
+	EOF
+	test_when_finished 'git bisect reset' &&
+	git bisect start &&
+	git bisect good $HASH1 &&
+	git bisect bad $HASH4 &&
+	! git bisect run ./fail.sh 2>err &&
+	sed -n 's/.*\(unable to verify.*\)/\1/p' err >actual &&
+	test_cmp expect actual
+"
+
 # We want to automatically find the commit that
-# introduced "Another" into hello.
-test_expect_success \
-    '"git bisect run" simple case' \
-    'echo "#"\!"/bin/sh" > test_script.sh &&
-     echo "grep Another hello > /dev/null" >> test_script.sh &&
-     echo "test \$? -ne 0" >> test_script.sh &&
-     chmod +x test_script.sh &&
-     git bisect start &&
-     git bisect good $HASH1 &&
-     git bisect bad $HASH4 &&
-     git bisect run ./test_script.sh > my_bisect_log.txt &&
-     grep "$HASH3 is the first bad commit" my_bisect_log.txt &&
-     git bisect reset'
+# added "Another" into hello.
+test_expect_success '"git bisect run" simple case' '
+	write_script test_script.sh <<-\EOF &&
+	! grep Another hello >/dev/null
+	EOF
+	git bisect start &&
+	git bisect good $HASH1 &&
+	git bisect bad $HASH4 &&
+	git bisect run ./test_script.sh >my_bisect_log.txt &&
+	grep "$HASH3 is the first bad commit" my_bisect_log.txt &&
+	git bisect reset
+'
+
+# We want to make sure no arguments has been eaten
+test_expect_success '"git bisect run" simple case' '
+	git bisect start &&
+	git bisect good $HASH1 &&
+	git bisect bad $HASH4 &&
+	git bisect run printf "%s %s\n" reset --bisect-skip >my_bisect_log.txt &&
+	grep -e "reset --bisect-skip" my_bisect_log.txt &&
+	git bisect reset
+'
 
 # We want to automatically find the commit that
-# introduced "Ciao" into hello.
-test_expect_success \
-    '"git bisect run" with more complex "git bisect start"' \
-    'echo "#"\!"/bin/sh" > test_script.sh &&
-     echo "grep Ciao hello > /dev/null" >> test_script.sh &&
-     echo "test \$? -ne 0" >> test_script.sh &&
-     chmod +x test_script.sh &&
-     git bisect start $HASH4 $HASH1 &&
-     git bisect run ./test_script.sh > my_bisect_log.txt &&
-     grep "$HASH4 is the first bad commit" my_bisect_log.txt &&
-     git bisect reset'
+# added "Ciao" into hello.
+test_expect_success '"git bisect run" with more complex "git bisect start"' '
+	write_script test_script.sh <<-\EOF &&
+	! grep Ciao hello >/dev/null
+	EOF
+	git bisect start $HASH4 $HASH1 &&
+	git bisect run ./test_script.sh >my_bisect_log.txt &&
+	grep "$HASH4 is the first bad commit" my_bisect_log.txt &&
+	git bisect reset
+'
+
+test_expect_success 'bisect run accepts exit code 126 as bad' '
+	test_when_finished "git bisect reset" &&
+	write_script test_script.sh <<-\EOF &&
+	! grep Another hello || exit 126 >/dev/null
+	EOF
+	git bisect start &&
+	git bisect good $HASH1 &&
+	git bisect bad $HASH4 &&
+	git bisect run ./test_script.sh >my_bisect_log.txt &&
+	grep "$HASH3 is the first bad commit" my_bisect_log.txt
+'
+
+test_expect_success POSIXPERM 'bisect run fails with non-executable test script' '
+	test_when_finished "git bisect reset" &&
+	>not-executable.sh &&
+	chmod -x not-executable.sh &&
+	git bisect start &&
+	git bisect good $HASH1 &&
+	git bisect bad $HASH4 &&
+	test_must_fail git bisect run ./not-executable.sh >my_bisect_log.txt &&
+	! grep "is the first bad commit" my_bisect_log.txt
+'
+
+test_expect_success 'bisect run accepts exit code 127 as bad' '
+	test_when_finished "git bisect reset" &&
+	write_script test_script.sh <<-\EOF &&
+	! grep Another hello || exit 127 >/dev/null
+	EOF
+	git bisect start &&
+	git bisect good $HASH1 &&
+	git bisect bad $HASH4 &&
+	git bisect run ./test_script.sh >my_bisect_log.txt &&
+	grep "$HASH3 is the first bad commit" my_bisect_log.txt
+'
+
+test_expect_success 'bisect run fails with missing test script' '
+	test_when_finished "git bisect reset" &&
+	rm -f does-not-exist.sh &&
+	git bisect start &&
+	git bisect good $HASH1 &&
+	git bisect bad $HASH4 &&
+	test_must_fail git bisect run ./does-not-exist.sh >my_bisect_log.txt &&
+	! grep "is the first bad commit" my_bisect_log.txt
+'
 
 # $HASH1 is good, $HASH5 is bad, we skip $HASH3
 # but $HASH4 is good,
@@ -295,24 +535,17 @@ HASH6=
 test_expect_success 'bisect run & skip: cannot tell between 2' '
 	add_line_into_file "6: Yet a line." hello &&
 	HASH6=$(git rev-parse --verify HEAD) &&
-	echo "#"\!"/bin/sh" > test_script.sh &&
-	echo "sed -ne \\\$p hello | grep Ciao > /dev/null && exit 125" >> test_script.sh &&
-	echo "grep line hello > /dev/null" >> test_script.sh &&
-	echo "test \$? -ne 0" >> test_script.sh &&
-	chmod +x test_script.sh &&
+	write_script test_script.sh <<-\EOF &&
+	sed -ne \$p hello | grep Ciao >/dev/null && exit 125
+	! grep line hello >/dev/null
+	EOF
 	git bisect start $HASH6 $HASH1 &&
-	if git bisect run ./test_script.sh > my_bisect_log.txt
-	then
-		echo Oops, should have failed.
-		false
-	else
-		test $? -eq 2 &&
-		grep "first bad commit could be any of" my_bisect_log.txt &&
-		! grep $HASH3 my_bisect_log.txt &&
-		! grep $HASH6 my_bisect_log.txt &&
-		grep $HASH4 my_bisect_log.txt &&
-		grep $HASH5 my_bisect_log.txt
-	fi
+	test_expect_code 2 git bisect run ./test_script.sh >my_bisect_log.txt &&
+	grep "first bad commit could be any of" my_bisect_log.txt &&
+	! grep $HASH3 my_bisect_log.txt &&
+	! grep $HASH6 my_bisect_log.txt &&
+	grep $HASH4 my_bisect_log.txt &&
+	grep $HASH5 my_bisect_log.txt
 '
 
 HASH7=
@@ -320,14 +553,13 @@ test_expect_success 'bisect run & skip: find first bad' '
 	git bisect reset &&
 	add_line_into_file "7: Should be the last line." hello &&
 	HASH7=$(git rev-parse --verify HEAD) &&
-	echo "#"\!"/bin/sh" > test_script.sh &&
-	echo "sed -ne \\\$p hello | grep Ciao > /dev/null && exit 125" >> test_script.sh &&
-	echo "sed -ne \\\$p hello | grep day > /dev/null && exit 125" >> test_script.sh &&
-	echo "grep Yet hello > /dev/null" >> test_script.sh &&
-	echo "test \$? -ne 0" >> test_script.sh &&
-	chmod +x test_script.sh &&
+	write_script test_script.sh <<-\EOF &&
+	sed -ne \$p hello | grep Ciao >/dev/null && exit 125
+	sed -ne \$p hello | grep day >/dev/null && exit 125
+	! grep Yet hello >/dev/null
+	EOF
 	git bisect start $HASH7 $HASH1 &&
-	git bisect run ./test_script.sh > my_bisect_log.txt &&
+	git bisect run ./test_script.sh >my_bisect_log.txt &&
 	grep "$HASH6 is the first bad commit" my_bisect_log.txt
 '
 
@@ -351,7 +583,7 @@ test_expect_success 'bisect skip many ranges' '
 
 test_expect_success 'bisect starting with a detached HEAD' '
 	git bisect reset &&
-	git checkout master^ &&
+	git checkout main^ &&
 	HEAD=$(git rev-parse --verify HEAD) &&
 	git bisect start &&
 	test $HEAD = $(cat .git/BISECT_START) &&
@@ -362,7 +594,7 @@ test_expect_success 'bisect starting with a detached HEAD' '
 test_expect_success 'bisect errors out if bad and good are mistaken' '
 	git bisect reset &&
 	test_must_fail git bisect start $HASH2 $HASH4 2> rev_list_error &&
-	test_i18ngrep "mistook good and bad" rev_list_error &&
+	test_grep "mistook good and bad" rev_list_error &&
 	git bisect reset
 '
 
@@ -404,7 +636,7 @@ test_expect_success 'side branch creation' '
 
 test_expect_success 'good merge base when good and bad are siblings' '
 	git bisect start "$HASH7" "$SIDE_HASH7" > my_bisect_log.txt &&
-	test_i18ngrep "merge base must be tested" my_bisect_log.txt &&
+	test_grep "merge base must be tested" my_bisect_log.txt &&
 	grep $HASH4 my_bisect_log.txt &&
 	git bisect good > my_bisect_log.txt &&
 	! grep "merge base must be tested" my_bisect_log.txt &&
@@ -413,7 +645,7 @@ test_expect_success 'good merge base when good and bad are siblings' '
 '
 test_expect_success 'skipped merge base when good and bad are siblings' '
 	git bisect start "$SIDE_HASH7" "$HASH7" > my_bisect_log.txt &&
-	test_i18ngrep "merge base must be tested" my_bisect_log.txt &&
+	test_grep "merge base must be tested" my_bisect_log.txt &&
 	grep $HASH4 my_bisect_log.txt &&
 	git bisect skip > my_bisect_log.txt 2>&1 &&
 	grep "warning" my_bisect_log.txt &&
@@ -423,11 +655,11 @@ test_expect_success 'skipped merge base when good and bad are siblings' '
 
 test_expect_success 'bad merge base when good and bad are siblings' '
 	git bisect start "$HASH7" HEAD > my_bisect_log.txt &&
-	test_i18ngrep "merge base must be tested" my_bisect_log.txt &&
+	test_grep "merge base must be tested" my_bisect_log.txt &&
 	grep $HASH4 my_bisect_log.txt &&
 	test_must_fail git bisect bad > my_bisect_log.txt 2>&1 &&
-	test_i18ngrep "merge base $HASH4 is bad" my_bisect_log.txt &&
-	test_i18ngrep "fixed between $HASH4 and \[$SIDE_HASH7\]" my_bisect_log.txt &&
+	test_grep "merge base $HASH4 is bad" my_bisect_log.txt &&
+	test_grep "fixed between $HASH4 and \[$SIDE_HASH7\]" my_bisect_log.txt &&
 	git bisect reset
 '
 
@@ -458,11 +690,29 @@ test_expect_success 'many merge bases creation' '
 	grep "$SIDE_HASH5" merge_bases.txt
 '
 
+# We want to automatically find the merge that
+# added "line" into hello.
+test_expect_success '"git bisect run --first-parent" simple case' '
+	git rev-list --first-parent $B_HASH ^$HASH4 >first_parent_chain.txt &&
+	write_script test_script.sh <<-\EOF &&
+	grep $(git rev-parse HEAD) first_parent_chain.txt || exit -1
+	! grep line hello >/dev/null
+	EOF
+	git bisect start --first-parent &&
+	test_path_is_file ".git/BISECT_FIRST_PARENT" &&
+	git bisect good $HASH4 &&
+	git bisect bad $B_HASH &&
+	git bisect run ./test_script.sh >my_bisect_log.txt &&
+	grep "$B_HASH is the first bad commit" my_bisect_log.txt &&
+	git bisect reset &&
+	test_path_is_missing .git/BISECT_FIRST_PARENT
+'
+
 test_expect_success 'good merge bases when good and bad are siblings' '
 	git bisect start "$B_HASH" "$A_HASH" > my_bisect_log.txt &&
-	test_i18ngrep "merge base must be tested" my_bisect_log.txt &&
+	test_grep "merge base must be tested" my_bisect_log.txt &&
 	git bisect good > my_bisect_log2.txt &&
-	test_i18ngrep "merge base must be tested" my_bisect_log2.txt &&
+	test_grep "merge base must be tested" my_bisect_log2.txt &&
 	{
 		{
 			grep "$SIDE_HASH5" my_bisect_log.txt &&
@@ -477,14 +727,14 @@ test_expect_success 'good merge bases when good and bad are siblings' '
 
 test_expect_success 'optimized merge base checks' '
 	git bisect start "$HASH7" "$SIDE_HASH7" > my_bisect_log.txt &&
-	test_i18ngrep "merge base must be tested" my_bisect_log.txt &&
+	test_grep "merge base must be tested" my_bisect_log.txt &&
 	grep "$HASH4" my_bisect_log.txt &&
 	git bisect good > my_bisect_log2.txt &&
 	test -f ".git/BISECT_ANCESTORS_OK" &&
 	test "$HASH6" = $(git rev-parse --verify HEAD) &&
 	git bisect bad &&
 	git bisect good "$A_HASH" > my_bisect_log4.txt &&
-	test_i18ngrep "merge base must be tested" my_bisect_log4.txt &&
+	test_grep "merge base must be tested" my_bisect_log4.txt &&
 	test_path_is_missing ".git/BISECT_ANCESTORS_OK"
 '
 
@@ -560,9 +810,9 @@ test_expect_success 'skipping away from skipped commit' '
 	test "$para3" = "$PARA_HASH3"
 '
 
-test_expect_success 'erroring out when using bad path parameters' '
+test_expect_success 'erroring out when using bad path arguments' '
 	test_must_fail git bisect start $PARA_HASH7 $HASH1 -- foobar 2> error.txt &&
-	test_i18ngrep "bad path parameters" error.txt
+	test_grep "bad path arguments" error.txt
 '
 
 test_expect_success 'test bisection on bare repo - --no-checkout specified' '
@@ -628,7 +878,7 @@ test_expect_success 'broken branch creation' '
 
 echo "" > expected.ok
 cat > expected.missing-tree.default <<EOF
-fatal: unable to read tree $deleted
+fatal: unable to read tree ($deleted)
 EOF
 
 test_expect_success 'bisect fails if tree is broken on start commit' '
@@ -701,7 +951,7 @@ test_expect_success 'bisect: --no-checkout - target after breakage' '
 test_expect_success 'bisect: demonstrate identification of damage boundary' "
 	git bisect reset &&
 	git checkout broken &&
-	git bisect start broken master --no-checkout &&
+	git bisect start broken main --no-checkout &&
 	test_must_fail git bisect run \"\$SHELL_PATH\" -c '
 		GOOD=\$(git for-each-ref \"--format=%(objectname)\" refs/bisect/good-*) &&
 		git rev-list --objects BISECT_HEAD --not \$GOOD >tmp.\$\$ &&
@@ -811,7 +1061,7 @@ test_expect_success 'bisect terms needs 0 or 1 argument' '
 	test_must_fail git bisect terms 1 2 &&
 	test_must_fail git bisect terms 2>actual &&
 	echo "error: no terms defined" >expected &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 test_expect_success 'bisect terms shows good/bad after start' '
@@ -837,6 +1087,16 @@ test_expect_success 'bisect start with one term1 and term2' '
 	git bisect reset
 '
 
+test_expect_success 'bogus command does not start bisect' '
+	git bisect reset &&
+	test_must_fail git bisect --bisect-terms 1 2 2>out &&
+	! grep "You need to start" out &&
+	test_must_fail git bisect --bisect-terms 2>out &&
+	! grep "You need to start" out &&
+	grep "git bisect.*visualize" out &&
+	git bisect reset
+'
+
 test_expect_success 'bisect replay with term1 and term2' '
 	git bisect replay log_to_replay.txt >bisect_result &&
 	grep "$HASH2 is the first term1 commit" bisect_result &&
@@ -885,7 +1145,7 @@ test_expect_success 'bisect start --term-* does store terms' '
 	Your current terms are two for the old state
 	and one for the new state.
 	EOF
-	test_i18ncmp expected actual &&
+	test_cmp expected actual &&
 	git bisect terms --term-bad >actual &&
 	echo one >expected &&
 	test_cmp expected actual &&
@@ -904,6 +1164,17 @@ test_expect_success 'bisect start takes options and revs in any order' '
 	test_cmp expected actual
 '
 
+# Bisect is started with --term-new and --term-old arguments,
+# then skip. The HEAD should be changed.
+test_expect_success 'bisect skip works with --term*' '
+	git bisect reset &&
+	git bisect start --term-new=fixed --term-old=unfixed HEAD $HASH1 &&
+	hash_skipped_from=$(git rev-parse --verify HEAD) &&
+	git bisect skip &&
+	hash_skipped_to=$(git rev-parse --verify HEAD) &&
+	test "$hash_skipped_from" != "$hash_skipped_to"
+'
+
 test_expect_success 'git bisect reset cleans bisection state properly' '
 	git bisect reset &&
 	git bisect start &&
@@ -911,14 +1182,81 @@ test_expect_success 'git bisect reset cleans bisection state properly' '
 	git bisect bad $HASH4 &&
 	git bisect reset &&
 	test -z "$(git for-each-ref "refs/bisect/*")" &&
-	test_path_is_missing "$GIT_DIR/BISECT_EXPECTED_REV" &&
-	test_path_is_missing "$GIT_DIR/BISECT_ANCESTORS_OK" &&
-	test_path_is_missing "$GIT_DIR/BISECT_LOG" &&
-	test_path_is_missing "$GIT_DIR/BISECT_RUN" &&
-	test_path_is_missing "$GIT_DIR/BISECT_TERMS" &&
-	test_path_is_missing "$GIT_DIR/head-name" &&
-	test_path_is_missing "$GIT_DIR/BISECT_HEAD" &&
-	test_path_is_missing "$GIT_DIR/BISECT_START"
+	test_ref_missing BISECT_EXPECTED_REV &&
+	test_path_is_missing ".git/BISECT_ANCESTORS_OK" &&
+	test_path_is_missing ".git/BISECT_LOG" &&
+	test_path_is_missing ".git/BISECT_RUN" &&
+	test_path_is_missing ".git/BISECT_TERMS" &&
+	test_path_is_missing ".git/BISECT_HEAD" &&
+	test_path_is_missing ".git/BISECT_START"
+'
+
+test_expect_success 'bisect handles annotated tags' '
+	test_commit commit-one &&
+	git tag -m foo tag-one &&
+	test_commit commit-two &&
+	git tag -m foo tag-two &&
+	git bisect start &&
+	git bisect good tag-one &&
+	git bisect bad tag-two >output &&
+	bad=$(git rev-parse --verify tag-two^{commit}) &&
+	grep "$bad is the first bad commit" output
+'
+
+test_expect_success 'bisect run fails with exit code equals or greater than 128' '
+	write_script test_script.sh <<-\EOF &&
+	exit 128
+	EOF
+	test_must_fail git bisect run ./test_script.sh &&
+	write_script test_script.sh <<-\EOF &&
+	exit 255
+	EOF
+	test_must_fail git bisect run ./test_script.sh
+'
+
+test_expect_success 'bisect visualize with a filename with dash and space' '
+	echo "My test line" >>"./-hello 2" &&
+	git add -- "./-hello 2" &&
+	git commit --quiet -m "Add test line" -- "./-hello 2" &&
+	git bisect visualize -p -- "-hello 2"
+'
+
+test_expect_success 'bisect state output with multiple good commits' '
+	git bisect reset &&
+	git bisect start >output &&
+	grep "waiting for both good and bad commits" output &&
+	git bisect log >output &&
+	grep "waiting for both good and bad commits" output &&
+	git bisect good "$HASH1" >output &&
+	grep "waiting for bad commit, 1 good commit known" output &&
+	git bisect log >output &&
+	grep "waiting for bad commit, 1 good commit known" output &&
+	git bisect good "$HASH2" >output &&
+	grep "waiting for bad commit, 2 good commits known" output &&
+	git bisect log >output &&
+	grep "waiting for bad commit, 2 good commits known" output
+'
+
+test_expect_success 'bisect state output with bad commit' '
+	git bisect reset &&
+	git bisect start >output &&
+	grep "waiting for both good and bad commits" output &&
+	git bisect log >output &&
+	grep "waiting for both good and bad commits" output &&
+	git bisect bad "$HASH4" >output &&
+	grep -F "waiting for good commit(s), bad commit known" output &&
+	git bisect log >output &&
+	grep -F "waiting for good commit(s), bad commit known" output
+'
+
+test_expect_success 'verify correct error message' '
+	git bisect reset &&
+	git bisect start $HASH4 $HASH1 &&
+	write_script test_script.sh <<-\EOF &&
+	rm .git/BISECT*
+	EOF
+	test_must_fail git bisect run ./test_script.sh 2>error &&
+	grep "git bisect good.*exited with error code" error
 '
 
 test_done
diff --git a/t/t6040-tracking-info.sh b/t/t6040-tracking-info.sh
index ad1922b..acc281c 100755
--- a/t/t6040-tracking-info.sh
+++ b/t/t6040-tracking-info.sh
@@ -2,6 +2,10 @@
 
 test_description='remote tracking stats'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 advance () {
@@ -34,7 +38,7 @@ test_expect_success setup '
 		git branch -d brokenbase &&
 		git checkout -b b6 origin
 	) &&
-	git checkout -b follower --track master &&
+	git checkout -b follower --track main &&
 	advance h
 '
 
@@ -54,16 +58,16 @@ test_expect_success 'branch -v' '
 		git branch -v
 	) |
 	sed -n -e "$t6040_script" >actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 cat >expect <<\EOF
-b1 [origin/master: ahead 1, behind 1] d
-b2 [origin/master: ahead 1, behind 1] d
-b3 [origin/master: behind 1] b
-b4 [origin/master: ahead 2] f
+b1 [origin/main: ahead 1, behind 1] d
+b2 [origin/main: ahead 1, behind 1] d
+b3 [origin/main: behind 1] b
+b4 [origin/main: ahead 2] f
 b5 [brokenbase: gone] g
-b6 [origin/master] c
+b6 [origin/main] c
 EOF
 
 test_expect_success 'branch -vv' '
@@ -72,20 +76,20 @@ test_expect_success 'branch -vv' '
 		git branch -vv
 	) |
 	sed -n -e "$t6040_script" >actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 test_expect_success 'checkout (diverged from upstream)' '
 	(
 		cd test && git checkout b1
 	) >actual &&
-	test_i18ngrep "have 1 and 1 different" actual
+	test_grep "have 1 and 1 different" actual
 '
 
 test_expect_success 'checkout with local tracked branch' '
-	git checkout master &&
+	git checkout main &&
 	git checkout follower >actual &&
-	test_i18ngrep "is ahead of" actual
+	test_grep "is ahead of" actual
 '
 
 test_expect_success 'checkout (upstream is gone)' '
@@ -93,14 +97,14 @@ test_expect_success 'checkout (upstream is gone)' '
 		cd test &&
 		git checkout b5
 	) >actual &&
-	test_i18ngrep "is based on .*, but the upstream is gone." actual
+	test_grep "is based on .*, but the upstream is gone." actual
 '
 
 test_expect_success 'checkout (up-to-date with upstream)' '
 	(
 		cd test && git checkout b6
 	) >actual &&
-	test_i18ngrep "Your branch is up to date with .origin/master" actual
+	test_grep "Your branch is up to date with .origin/main" actual
 '
 
 test_expect_success 'status (diverged from upstream)' '
@@ -110,7 +114,7 @@ test_expect_success 'status (diverged from upstream)' '
 		# reports nothing to commit
 		test_must_fail git commit --dry-run
 	) >actual &&
-	test_i18ngrep "have 1 and 1 different" actual
+	test_grep "have 1 and 1 different" actual
 '
 
 test_expect_success 'status (upstream is gone)' '
@@ -120,7 +124,7 @@ test_expect_success 'status (upstream is gone)' '
 		# reports nothing to commit
 		test_must_fail git commit --dry-run
 	) >actual &&
-	test_i18ngrep "is based on .*, but the upstream is gone." actual
+	test_grep "is based on .*, but the upstream is gone." actual
 '
 
 test_expect_success 'status (up-to-date with upstream)' '
@@ -130,11 +134,11 @@ test_expect_success 'status (up-to-date with upstream)' '
 		# reports nothing to commit
 		test_must_fail git commit --dry-run
 	) >actual &&
-	test_i18ngrep "Your branch is up to date with .origin/master" actual
+	test_grep "Your branch is up to date with .origin/main" actual
 '
 
 cat >expect <<\EOF
-## b1...origin/master [ahead 1, behind 1]
+## b1...origin/main [ahead 1, behind 1]
 EOF
 
 test_expect_success 'status -s -b (diverged from upstream)' '
@@ -143,11 +147,11 @@ test_expect_success 'status -s -b (diverged from upstream)' '
 		git checkout b1 >/dev/null &&
 		git status -s -b | head -1
 	) >actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 cat >expect <<\EOF
-## b1...origin/master [different]
+## b1...origin/main [different]
 EOF
 
 test_expect_success 'status -s -b --no-ahead-behind (diverged from upstream)' '
@@ -156,11 +160,11 @@ test_expect_success 'status -s -b --no-ahead-behind (diverged from upstream)' '
 		git checkout b1 >/dev/null &&
 		git status -s -b --no-ahead-behind | head -1
 	) >actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 cat >expect <<\EOF
-## b1...origin/master [different]
+## b1...origin/main [different]
 EOF
 
 test_expect_success 'status.aheadbehind=false status -s -b (diverged from upstream)' '
@@ -169,12 +173,12 @@ test_expect_success 'status.aheadbehind=false status -s -b (diverged from upstre
 		git checkout b1 >/dev/null &&
 		git -c status.aheadbehind=false status -s -b | head -1
 	) >actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 cat >expect <<\EOF
 On branch b1
-Your branch and 'origin/master' have diverged,
+Your branch and 'origin/main' have diverged,
 and have 1 and 1 different commits each, respectively.
 EOF
 
@@ -184,7 +188,7 @@ test_expect_success 'status --long --branch' '
 		git checkout b1 >/dev/null &&
 		git status --long -b | head -3
 	) >actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 test_expect_success 'status --long --branch' '
@@ -193,12 +197,12 @@ test_expect_success 'status --long --branch' '
 		git checkout b1 >/dev/null &&
 		git -c status.aheadbehind=true status --long -b | head -3
 	) >actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 cat >expect <<\EOF
 On branch b1
-Your branch and 'origin/master' refer to different commits.
+Your branch and 'origin/main' refer to different commits.
 EOF
 
 test_expect_success 'status --long --branch --no-ahead-behind' '
@@ -207,7 +211,7 @@ test_expect_success 'status --long --branch --no-ahead-behind' '
 		git checkout b1 >/dev/null &&
 		git status --long -b --no-ahead-behind | head -2
 	) >actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 test_expect_success 'status.aheadbehind=false status --long --branch' '
@@ -216,7 +220,7 @@ test_expect_success 'status.aheadbehind=false status --long --branch' '
 		git checkout b1 >/dev/null &&
 		git -c status.aheadbehind=false status --long -b | head -2
 	) >actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 cat >expect <<\EOF
@@ -229,11 +233,11 @@ test_expect_success 'status -s -b (upstream is gone)' '
 		git checkout b5 >/dev/null &&
 		git status -s -b | head -1
 	) >actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 cat >expect <<\EOF
-## b6...origin/master
+## b6...origin/main
 EOF
 
 test_expect_success 'status -s -b (up-to-date with upstream)' '
@@ -242,49 +246,49 @@ test_expect_success 'status -s -b (up-to-date with upstream)' '
 		git checkout b6 >/dev/null &&
 		git status -s -b | head -1
 	) >actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 test_expect_success 'fail to track lightweight tags' '
-	git checkout master &&
+	git checkout main &&
 	git tag light &&
 	test_must_fail git branch --track lighttrack light >actual &&
-	test_i18ngrep ! "set up to track" actual &&
+	test_grep ! "set up to track" actual &&
 	test_must_fail git checkout lighttrack
 '
 
 test_expect_success 'fail to track annotated tags' '
-	git checkout master &&
+	git checkout main &&
 	git tag -m heavy heavy &&
 	test_must_fail git branch --track heavytrack heavy >actual &&
-	test_i18ngrep ! "set up to track" actual &&
+	test_grep ! "set up to track" actual &&
 	test_must_fail git checkout heavytrack
 '
 
 test_expect_success '--set-upstream-to does not change branch' '
-	git branch from-master master &&
-	git branch --set-upstream-to master from-master &&
-	git branch from-master2 master &&
-	test_must_fail git config branch.from-master2.merge > actual &&
-	git rev-list from-master2 &&
-	git update-ref refs/heads/from-master2 from-master2^ &&
-	git rev-parse from-master2 >expect2 &&
-	git branch --set-upstream-to master from-master2 &&
-	git config branch.from-master.merge > actual &&
-	git rev-parse from-master2 >actual2 &&
-	grep -q "^refs/heads/master$" actual &&
+	git branch from-main main &&
+	git branch --set-upstream-to main from-main &&
+	git branch from-topic_2 main &&
+	test_must_fail git config branch.from-topic_2.merge > actual &&
+	git rev-list from-topic_2 &&
+	git update-ref refs/heads/from-topic_2 from-topic_2^ &&
+	git rev-parse from-topic_2 >expect2 &&
+	git branch --set-upstream-to main from-topic_2 &&
+	git config branch.from-main.merge > actual &&
+	git rev-parse from-topic_2 >actual2 &&
+	grep -q "^refs/heads/main$" actual &&
 	cmp expect2 actual2
 '
 
 test_expect_success '--set-upstream-to @{-1}' '
 	git checkout follower &&
-	git checkout from-master2 &&
-	git config branch.from-master2.merge > expect2 &&
-	git branch --set-upstream-to @{-1} from-master &&
-	git config branch.from-master.merge > actual &&
-	git config branch.from-master2.merge > actual2 &&
-	git branch --set-upstream-to follower from-master &&
-	git config branch.from-master.merge > expect &&
+	git checkout from-topic_2 &&
+	git config branch.from-topic_2.merge > expect2 &&
+	git branch --set-upstream-to @{-1} from-main &&
+	git config branch.from-main.merge > actual &&
+	git config branch.from-topic_2.merge > actual2 &&
+	git branch --set-upstream-to follower from-main &&
+	git config branch.from-main.merge > expect &&
 	test_cmp expect2 actual2 &&
 	test_cmp expect actual
 '
diff --git a/t/t6041-bisect-submodule.sh b/t/t6041-bisect-submodule.sh
index df1eff0..82013fc 100755
--- a/t/t6041-bisect-submodule.sh
+++ b/t/t6041-bisect-submodule.sh
@@ -8,7 +8,7 @@ test_description='bisect can handle submodules'
 git_bisect () {
 	git status -su >expect &&
 	ls -1pR * >>expect &&
-	tar cf "$TRASH_DIRECTORY/tmp.tar" * &&
+	"$TAR" cf "$TRASH_DIRECTORY/tmp.tar" * &&
 	GOOD=$(git rev-parse --verify HEAD) &&
 	may_only_be_test_must_fail "$2" &&
 	$2 git checkout "$1" &&
@@ -25,7 +25,7 @@ git_bisect () {
 	git bisect start &&
 	git bisect good $GOOD &&
 	rm -rf * &&
-	tar xf "$TRASH_DIRECTORY/tmp.tar" &&
+	"$TAR" xf "$TRASH_DIRECTORY/tmp.tar" &&
 	git status -su >actual &&
 	ls -1pR * >>actual &&
 	test_cmp expect actual &&
diff --git a/t/t6050-replace.sh b/t/t6050-replace.sh
index c80dc10..c6e9b33 100755
--- a/t/t6050-replace.sh
+++ b/t/t6050-replace.sh
@@ -4,6 +4,9 @@
 #
 test_description='Tests replace refs functionality'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 . "$TEST_DIRECTORY/lib-gpg.sh"
 
@@ -41,7 +44,7 @@ commit_peeling_shows_parents ()
 	_parent_number=$(( $_parent_number + 1 ))
     done &&
     test_must_fail git rev-parse --verify $_commit^$_parent_number 2>err &&
-    test_i18ngrep "Needed a single revision" err
+    test_grep "Needed a single revision" err
 }
 
 commit_has_parents ()
@@ -59,59 +62,59 @@ HASH6=
 HASH7=
 
 test_expect_success 'set up buggy branch' '
-     echo "line 1" >>hello &&
-     echo "line 2" >>hello &&
-     echo "line 3" >>hello &&
-     echo "line 4" >>hello &&
-     add_and_commit_file hello "4 lines" &&
-     HASH1=$(git rev-parse --verify HEAD) &&
-     echo "line BUG" >>hello &&
-     echo "line 6" >>hello &&
-     echo "line 7" >>hello &&
-     echo "line 8" >>hello &&
-     add_and_commit_file hello "4 more lines with a BUG" &&
-     HASH2=$(git rev-parse --verify HEAD) &&
-     echo "line 9" >>hello &&
-     echo "line 10" >>hello &&
-     add_and_commit_file hello "2 more lines" &&
-     HASH3=$(git rev-parse --verify HEAD) &&
-     echo "line 11" >>hello &&
-     add_and_commit_file hello "1 more line" &&
-     HASH4=$(git rev-parse --verify HEAD) &&
-     sed -e "s/BUG/5/" hello >hello.new &&
-     mv hello.new hello &&
-     add_and_commit_file hello "BUG fixed" &&
-     HASH5=$(git rev-parse --verify HEAD) &&
-     echo "line 12" >>hello &&
-     echo "line 13" >>hello &&
-     add_and_commit_file hello "2 more lines" &&
-     HASH6=$(git rev-parse --verify HEAD) &&
-     echo "line 14" >>hello &&
-     echo "line 15" >>hello &&
-     echo "line 16" >>hello &&
-     add_and_commit_file hello "again 3 more lines" &&
-     HASH7=$(git rev-parse --verify HEAD)
+	echo "line 1" >>hello &&
+	echo "line 2" >>hello &&
+	echo "line 3" >>hello &&
+	echo "line 4" >>hello &&
+	add_and_commit_file hello "4 lines" &&
+	HASH1=$(git rev-parse --verify HEAD) &&
+	echo "line BUG" >>hello &&
+	echo "line 6" >>hello &&
+	echo "line 7" >>hello &&
+	echo "line 8" >>hello &&
+	add_and_commit_file hello "4 more lines with a BUG" &&
+	HASH2=$(git rev-parse --verify HEAD) &&
+	echo "line 9" >>hello &&
+	echo "line 10" >>hello &&
+	add_and_commit_file hello "2 more lines" &&
+	HASH3=$(git rev-parse --verify HEAD) &&
+	echo "line 11" >>hello &&
+	add_and_commit_file hello "1 more line" &&
+	HASH4=$(git rev-parse --verify HEAD) &&
+	sed -e "s/BUG/5/" hello >hello.new &&
+	mv hello.new hello &&
+	add_and_commit_file hello "BUG fixed" &&
+	HASH5=$(git rev-parse --verify HEAD) &&
+	echo "line 12" >>hello &&
+	echo "line 13" >>hello &&
+	add_and_commit_file hello "2 more lines" &&
+	HASH6=$(git rev-parse --verify HEAD) &&
+	echo "line 14" >>hello &&
+	echo "line 15" >>hello &&
+	echo "line 16" >>hello &&
+	add_and_commit_file hello "again 3 more lines" &&
+	HASH7=$(git rev-parse --verify HEAD)
 '
 
 test_expect_success 'replace the author' '
-     git cat-file commit $HASH2 | grep "author A U Thor" &&
-     R=$(git cat-file commit $HASH2 | sed -e "s/A U/O/" | git hash-object -t commit --stdin -w) &&
-     git cat-file commit $R | grep "author O Thor" &&
-     git update-ref refs/replace/$HASH2 $R &&
-     git show HEAD~5 | grep "O Thor" &&
-     git show $HASH2 | grep "O Thor"
+	git cat-file commit $HASH2 | grep "author A U Thor" &&
+	R=$(git cat-file commit $HASH2 | sed -e "s/A U/O/" | git hash-object -t commit --stdin -w) &&
+	git cat-file commit $R | grep "author O Thor" &&
+	git update-ref refs/replace/$HASH2 $R &&
+	git show HEAD~5 | grep "O Thor" &&
+	git show $HASH2 | grep "O Thor"
 '
 
 test_expect_success 'test --no-replace-objects option' '
-     git cat-file commit $HASH2 | grep "author O Thor" &&
-     git --no-replace-objects cat-file commit $HASH2 | grep "author A U Thor" &&
-     git show $HASH2 | grep "O Thor" &&
-     git --no-replace-objects show $HASH2 | grep "A U Thor"
+	git cat-file commit $HASH2 | grep "author O Thor" &&
+	git --no-replace-objects cat-file commit $HASH2 | grep "author A U Thor" &&
+	git show $HASH2 | grep "O Thor" &&
+	git --no-replace-objects show $HASH2 | grep "A U Thor"
 '
 
 test_expect_success 'test GIT_NO_REPLACE_OBJECTS env variable' '
-     GIT_NO_REPLACE_OBJECTS=1 git cat-file commit $HASH2 | grep "author A U Thor" &&
-     GIT_NO_REPLACE_OBJECTS=1 git show $HASH2 | grep "A U Thor"
+	GIT_NO_REPLACE_OBJECTS=1 git cat-file commit $HASH2 | grep "author A U Thor" &&
+	GIT_NO_REPLACE_OBJECTS=1 git show $HASH2 | grep "A U Thor"
 '
 
 test_expect_success 'test core.usereplacerefs config option' '
@@ -129,64 +132,64 @@ tagger T A Gger <> 0 +0000
 EOF
 
 test_expect_success 'tag replaced commit' '
-     git mktag <tag.sig >.git/refs/tags/mytag 2>message
+	git update-ref refs/tags/mytag $(git mktag <tag.sig)
 '
 
 test_expect_success '"git fsck" works' '
-     git fsck master >fsck_master.out &&
-     test_i18ngrep "dangling commit $R" fsck_master.out &&
-     test_i18ngrep "dangling tag $(git show-ref -s refs/tags/mytag)" fsck_master.out &&
-     test -z "$(git fsck)"
+	git fsck main >fsck_main.out &&
+	test_grep "dangling commit $R" fsck_main.out &&
+	test_grep "dangling tag $(git show-ref -s refs/tags/mytag)" fsck_main.out &&
+	test -z "$(git fsck)"
 '
 
 test_expect_success 'repack, clone and fetch work' '
-     git repack -a -d &&
-     git clone --no-hardlinks . clone_dir &&
-     (
-	  cd clone_dir &&
-	  git show HEAD~5 | grep "A U Thor" &&
-	  git show $HASH2 | grep "A U Thor" &&
-	  git cat-file commit $R &&
-	  git repack -a -d &&
-	  test_must_fail git cat-file commit $R &&
-	  git fetch ../ "refs/replace/*:refs/replace/*" &&
-	  git show HEAD~5 | grep "O Thor" &&
-	  git show $HASH2 | grep "O Thor" &&
-	  git cat-file commit $R
-     )
+	git repack -a -d &&
+	git clone --no-hardlinks . clone_dir &&
+	(
+		cd clone_dir &&
+		git show HEAD~5 | grep "A U Thor" &&
+		git show $HASH2 | grep "A U Thor" &&
+		git cat-file commit $R &&
+		git repack -a -d &&
+		test_must_fail git cat-file commit $R &&
+		git fetch ../ "refs/replace/*:refs/replace/*" &&
+		git show HEAD~5 | grep "O Thor" &&
+		git show $HASH2 | grep "O Thor" &&
+		git cat-file commit $R
+	)
 '
 
 test_expect_success '"git replace" listing and deleting' '
-     test "$HASH2" = "$(git replace -l)" &&
-     test "$HASH2" = "$(git replace)" &&
-     aa=${HASH2%??????????????????????????????????????} &&
-     test "$HASH2" = "$(git replace --list "$aa*")" &&
-     test_must_fail git replace -d $R &&
-     test_must_fail git replace --delete &&
-     test_must_fail git replace -l -d $HASH2 &&
-     git replace -d $HASH2 &&
-     git show $HASH2 | grep "A U Thor" &&
-     test -z "$(git replace -l)"
+	test "$HASH2" = "$(git replace -l)" &&
+	test "$HASH2" = "$(git replace)" &&
+	aa=${HASH2%??????????????????????????????????????} &&
+	test "$HASH2" = "$(git replace --list "$aa*")" &&
+	test_must_fail git replace -d $R &&
+	test_must_fail git replace --delete &&
+	test_must_fail git replace -l -d $HASH2 &&
+	git replace -d $HASH2 &&
+	git show $HASH2 | grep "A U Thor" &&
+	test -z "$(git replace -l)"
 '
 
 test_expect_success '"git replace" replacing' '
-     git replace $HASH2 $R &&
-     git show $HASH2 | grep "O Thor" &&
-     test_must_fail git replace $HASH2 $R &&
-     git replace -f $HASH2 $R &&
-     test_must_fail git replace -f &&
-     test "$HASH2" = "$(git replace)"
+	git replace $HASH2 $R &&
+	git show $HASH2 | grep "O Thor" &&
+	test_must_fail git replace $HASH2 $R &&
+	git replace -f $HASH2 $R &&
+	test_must_fail git replace -f &&
+	test "$HASH2" = "$(git replace)"
 '
 
 test_expect_success '"git replace" resolves sha1' '
-     SHORTHASH2=$(git rev-parse --short=8 $HASH2) &&
-     git replace -d $SHORTHASH2 &&
-     git replace $SHORTHASH2 $R &&
-     git show $HASH2 | grep "O Thor" &&
-     test_must_fail git replace $HASH2 $R &&
-     git replace -f $HASH2 $R &&
-     test_must_fail git replace --force &&
-     test "$HASH2" = "$(git replace)"
+	SHORTHASH2=$(git rev-parse --short=8 $HASH2) &&
+	git replace -d $SHORTHASH2 &&
+	git replace $SHORTHASH2 $R &&
+	git show $HASH2 | grep "O Thor" &&
+	test_must_fail git replace $HASH2 $R &&
+	git replace -f $HASH2 $R &&
+	test_must_fail git replace --force &&
+	test "$HASH2" = "$(git replace)"
 '
 
 # This creates a side branch where the bug in H2
@@ -204,79 +207,79 @@ test_expect_success '"git replace" resolves sha1' '
 # Then we replace H6 with P6.
 #
 test_expect_success 'create parallel branch without the bug' '
-     git replace -d $HASH2 &&
-     git show $HASH2 | grep "A U Thor" &&
-     git checkout $HASH1 &&
-     git cherry-pick $HASH2 &&
-     git show $HASH5 | git apply &&
-     git commit --amend -m "hello: 4 more lines WITHOUT the bug" hello &&
-     PARA2=$(git rev-parse --verify HEAD) &&
-     git cherry-pick $HASH3 &&
-     PARA3=$(git rev-parse --verify HEAD) &&
-     git cherry-pick $HASH4 &&
-     PARA4=$(git rev-parse --verify HEAD) &&
-     git cherry-pick $HASH6 &&
-     PARA6=$(git rev-parse --verify HEAD) &&
-     git replace $HASH6 $PARA6 &&
-     git checkout master &&
-     cur=$(git rev-parse --verify HEAD) &&
-     test "$cur" = "$HASH7" &&
-     git log --pretty=oneline | grep $PARA2 &&
-     git remote add cloned ./clone_dir
+	git replace -d $HASH2 &&
+	git show $HASH2 | grep "A U Thor" &&
+	git checkout $HASH1 &&
+	git cherry-pick $HASH2 &&
+	git show $HASH5 | git apply &&
+	git commit --amend -m "hello: 4 more lines WITHOUT the bug" hello &&
+	PARA2=$(git rev-parse --verify HEAD) &&
+	git cherry-pick $HASH3 &&
+	PARA3=$(git rev-parse --verify HEAD) &&
+	git cherry-pick $HASH4 &&
+	PARA4=$(git rev-parse --verify HEAD) &&
+	git cherry-pick $HASH6 &&
+	PARA6=$(git rev-parse --verify HEAD) &&
+	git replace $HASH6 $PARA6 &&
+	git checkout main &&
+	cur=$(git rev-parse --verify HEAD) &&
+	test "$cur" = "$HASH7" &&
+	git log --pretty=oneline | grep $PARA2 &&
+	git remote add cloned ./clone_dir
 '
 
 test_expect_success 'push to cloned repo' '
-     git push cloned $HASH6^:refs/heads/parallel &&
-     (
-	  cd clone_dir &&
-	  git checkout parallel &&
-	  git log --pretty=oneline | grep $PARA2
-     )
+	git push cloned $HASH6^:refs/heads/parallel &&
+	(
+		cd clone_dir &&
+		git checkout parallel &&
+		git log --pretty=oneline | grep $PARA2
+	)
 '
 
 test_expect_success 'push branch with replacement' '
-     git cat-file commit $PARA3 | grep "author A U Thor" &&
-     S=$(git cat-file commit $PARA3 | sed -e "s/A U/O/" | git hash-object -t commit --stdin -w) &&
-     git cat-file commit $S | grep "author O Thor" &&
-     git replace $PARA3 $S &&
-     git show $HASH6~2 | grep "O Thor" &&
-     git show $PARA3 | grep "O Thor" &&
-     git push cloned $HASH6^:refs/heads/parallel2 &&
-     (
-	  cd clone_dir &&
-	  git checkout parallel2 &&
-	  git log --pretty=oneline | grep $PARA3 &&
-	  git show $PARA3 | grep "A U Thor"
-     )
+	git cat-file commit $PARA3 | grep "author A U Thor" &&
+	S=$(git cat-file commit $PARA3 | sed -e "s/A U/O/" | git hash-object -t commit --stdin -w) &&
+	git cat-file commit $S | grep "author O Thor" &&
+	git replace $PARA3 $S &&
+	git show $HASH6~2 | grep "O Thor" &&
+	git show $PARA3 | grep "O Thor" &&
+	git push cloned $HASH6^:refs/heads/parallel2 &&
+	(
+		cd clone_dir &&
+		git checkout parallel2 &&
+		git log --pretty=oneline | grep $PARA3 &&
+		git show $PARA3 | grep "A U Thor"
+	)
 '
 
 test_expect_success 'fetch branch with replacement' '
-     git branch tofetch $HASH6 &&
-     (
-	  cd clone_dir &&
-	  git fetch origin refs/heads/tofetch:refs/heads/parallel3 &&
-	  git log --pretty=oneline parallel3 >output.txt &&
-	  ! grep $PARA3 output.txt &&
-	  git show $PARA3 >para3.txt &&
-	  grep "A U Thor" para3.txt &&
-	  git fetch origin "refs/replace/*:refs/replace/*" &&
-	  git log --pretty=oneline parallel3 >output.txt &&
-	  grep $PARA3 output.txt &&
-	  git show $PARA3 >para3.txt &&
-	  grep "O Thor" para3.txt
-     )
+	git branch tofetch $HASH6 &&
+	(
+		cd clone_dir &&
+		git fetch origin refs/heads/tofetch:refs/heads/parallel3 &&
+		git log --pretty=oneline parallel3 >output.txt &&
+		! grep $PARA3 output.txt &&
+		git show $PARA3 >para3.txt &&
+		grep "A U Thor" para3.txt &&
+		git fetch origin "refs/replace/*:refs/replace/*" &&
+		git log --pretty=oneline parallel3 >output.txt &&
+		grep $PARA3 output.txt &&
+		git show $PARA3 >para3.txt &&
+		grep "O Thor" para3.txt
+	)
 '
 
 test_expect_success 'bisect and replacements' '
-     git bisect start $HASH7 $HASH1 &&
-     test "$PARA3" = "$(git rev-parse --verify HEAD)" &&
-     git bisect reset &&
-     GIT_NO_REPLACE_OBJECTS=1 git bisect start $HASH7 $HASH1 &&
-     test "$HASH4" = "$(git rev-parse --verify HEAD)" &&
-     git bisect reset &&
-     git --no-replace-objects bisect start $HASH7 $HASH1 &&
-     test "$HASH4" = "$(git rev-parse --verify HEAD)" &&
-     git bisect reset
+	git bisect start $HASH7 $HASH1 &&
+	test "$PARA3" = "$(git rev-parse --verify HEAD)" &&
+	git bisect reset &&
+	GIT_NO_REPLACE_OBJECTS=1 git bisect start $HASH7 $HASH1 &&
+	test "$HASH4" = "$(git rev-parse --verify HEAD)" &&
+	git bisect reset &&
+	git --no-replace-objects bisect start $HASH7 $HASH1 &&
+	test "$HASH4" = "$(git rev-parse --verify HEAD)" &&
+	git bisect reset
 '
 
 test_expect_success 'index-pack and replacements' '
@@ -461,7 +464,7 @@ test_expect_success GPG 'set up a merge commit with a mergetag' '
 	git commit -m "hello: 2 more lines from a test branch" &&
 	HASH9=$(git rev-parse --verify HEAD) &&
 	git tag -s -m "tag for testing with a mergetag" test_tag HEAD &&
-	git checkout master &&
+	git checkout main &&
 	git merge -s ours test_tag &&
 	HASH10=$(git rev-parse --verify HEAD) &&
 	git cat-file commit $HASH10 | grep "^mergetag object"
@@ -487,9 +490,9 @@ test_expect_success '--convert-graft-file' '
 		$(git rev-parse HEAD^^ HEAD^ HEAD^^ HEAD^2) \
 		>.git/info/grafts &&
 	git status 2>stderr &&
-	test_i18ngrep "hint:.*grafts is deprecated" stderr &&
+	test_grep "hint:.*grafts is deprecated" stderr &&
 	git replace --convert-graft-file 2>stderr &&
-	test_i18ngrep ! "hint:.*grafts is deprecated" stderr &&
+	test_grep ! "hint:.*grafts is deprecated" stderr &&
 	test_path_is_missing .git/info/grafts &&
 
 	: verify that the history is now "grafted" &&
@@ -500,8 +503,8 @@ test_expect_success '--convert-graft-file' '
 	test_when_finished "rm -f .git/info/grafts" &&
 	echo $EMPTY_BLOB $EMPTY_TREE >.git/info/grafts &&
 	test_must_fail git replace --convert-graft-file 2>err &&
-	test_i18ngrep "$EMPTY_BLOB $EMPTY_TREE" err &&
-	test_i18ngrep "$EMPTY_BLOB $EMPTY_TREE" .git/info/grafts
+	test_grep "$EMPTY_BLOB $EMPTY_TREE" err &&
+	test_grep "$EMPTY_BLOB $EMPTY_TREE" .git/info/grafts
 '
 
 test_done
diff --git a/t/t6060-merge-index.sh b/t/t6060-merge-index.sh
index ddf34f0..1a8b64c 100755
--- a/t/t6060-merge-index.sh
+++ b/t/t6060-merge-index.sh
@@ -1,12 +1,12 @@
 #!/bin/sh
 
 test_description='basic git merge-index / git-merge-one-file tests'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup diverging branches' '
-	for i in 1 2 3 4 5 6 7 8 9 10; do
-		echo $i
-	done >file &&
+	test_write_lines 1 2 3 4 5 6 7 8 9 10 >file &&
 	git add file &&
 	git commit -m base &&
 	git tag base &&
diff --git a/t/t6100-rev-list-in-order.sh b/t/t6100-rev-list-in-order.sh
index e934bc2..88ed7bd 100755
--- a/t/t6100-rev-list-in-order.sh
+++ b/t/t6100-rev-list-in-order.sh
@@ -2,6 +2,7 @@
 
 test_description='rev-list testing in-commit-order'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup a commit history with trees, blobs' '
diff --git a/t/t6101-rev-parse-parents.sh b/t/t6101-rev-parse-parents.sh
index 7531262..d20723d 100755
--- a/t/t6101-rev-parse-parents.sh
+++ b/t/t6101-rev-parse-parents.sh
@@ -5,6 +5,11 @@
 
 test_description='Test git rev-parse with different parent options'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
+TEST_CREATE_REPO_NO_TEMPLATE=1
 . ./test-lib.sh
 
 test_cmp_rev_output () {
@@ -18,10 +23,11 @@ test_expect_success 'setup' '
 	test_commit second &&
 	git checkout --orphan tmp &&
 	test_commit start2 &&
-	git checkout master &&
+	git checkout main &&
 	git merge -m next --allow-unrelated-histories start2 &&
 	test_commit final &&
 
+	mkdir .git/info &&
 	test_seq 40 |
 	while read i
 	do
@@ -29,7 +35,7 @@ test_expect_success 'setup' '
 		test_tick &&
 		git commit --allow-empty -m "$i" &&
 		commit=$(git rev-parse --verify HEAD) &&
-		printf "$commit " >>.git/info/grafts
+		printf "$commit " >>.git/info/grafts || return 1
 	done
 '
 
diff --git a/t/t6102-rev-list-unexpected-objects.sh b/t/t6102-rev-list-unexpected-objects.sh
index 52cde09..5d28507 100755
--- a/t/t6102-rev-list-unexpected-objects.sh
+++ b/t/t6102-rev-list-unexpected-objects.sh
@@ -2,6 +2,7 @@
 
 test_description='git rev-list should handle unexpected object types'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup well-formed objects' '
@@ -16,13 +17,18 @@ test_expect_success 'setup unexpected non-blob entry' '
 	broken_tree="$(git hash-object -w --literally -t tree broken-tree)"
 '
 
-test_expect_failure 'traverse unexpected non-blob entry (lone)' '
-	test_must_fail git rev-list --objects $broken_tree
+test_expect_success 'TODO (should fail!): traverse unexpected non-blob entry (lone)' '
+	sed "s/Z$//" >expect <<-EOF &&
+	$broken_tree Z
+	$tree foo
+	EOF
+	git rev-list --objects $broken_tree >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success 'traverse unexpected non-blob entry (seen)' '
 	test_must_fail git rev-list --objects $tree $broken_tree >output 2>&1 &&
-	test_i18ngrep "is not a blob" output
+	test_grep "is not a blob" output
 '
 
 test_expect_success 'setup unexpected non-tree entry' '
@@ -36,7 +42,7 @@ test_expect_success 'traverse unexpected non-tree entry (lone)' '
 
 test_expect_success 'traverse unexpected non-tree entry (seen)' '
 	test_must_fail git rev-list --objects $blob $broken_tree >output 2>&1 &&
-	test_i18ngrep "is not a tree" output
+	test_grep "is not a tree" output
 '
 
 test_expect_success 'setup unexpected non-commit parent' '
@@ -48,13 +54,13 @@ test_expect_success 'setup unexpected non-commit parent' '
 
 test_expect_success 'traverse unexpected non-commit parent (lone)' '
 	test_must_fail git rev-list --objects $broken_commit >output 2>&1 &&
-	test_i18ngrep "not a commit" output
+	test_grep "not a commit" output
 '
 
 test_expect_success 'traverse unexpected non-commit parent (seen)' '
 	test_must_fail git rev-list --objects $blob $broken_commit \
 		>output 2>&1 &&
-	test_i18ngrep "not a commit" output
+	test_grep "not a commit" output
 '
 
 test_expect_success 'setup unexpected non-tree root' '
@@ -70,7 +76,7 @@ test_expect_success 'traverse unexpected non-tree root (lone)' '
 test_expect_success 'traverse unexpected non-tree root (seen)' '
 	test_must_fail git rev-list --objects $blob $broken_commit \
 		>output 2>&1 &&
-	test_i18ngrep "not a tree" output
+	test_grep "not a tree" output
 '
 
 test_expect_success 'setup unexpected non-commit tag' '
@@ -87,7 +93,7 @@ test_expect_success 'traverse unexpected non-commit tag (lone)' '
 
 test_expect_success 'traverse unexpected non-commit tag (seen)' '
 	test_must_fail git rev-list --objects $blob $tag >output 2>&1 &&
-	test_i18ngrep "not a commit" output
+	test_grep "not a commit" output
 '
 
 test_expect_success 'setup unexpected non-tree tag' '
@@ -104,7 +110,7 @@ test_expect_success 'traverse unexpected non-tree tag (lone)' '
 
 test_expect_success 'traverse unexpected non-tree tag (seen)' '
 	test_must_fail git rev-list --objects $blob $tag >output 2>&1 &&
-	test_i18ngrep "not a tree" output
+	test_grep "not a tree" output
 '
 
 test_expect_success 'setup unexpected non-blob tag' '
@@ -115,13 +121,13 @@ test_expect_success 'setup unexpected non-blob tag' '
 	tag=$(git hash-object -w --literally -t tag broken-tag)
 '
 
-test_expect_failure 'traverse unexpected non-blob tag (lone)' '
+test_expect_success 'traverse unexpected non-blob tag (lone)' '
 	test_must_fail git rev-list --objects $tag
 '
 
 test_expect_success 'traverse unexpected non-blob tag (seen)' '
 	test_must_fail git rev-list --objects $commit $tag >output 2>&1 &&
-	test_i18ngrep "not a blob" output
+	test_grep "not a blob" output
 '
 
 test_done
diff --git a/t/t6110-rev-list-sparse.sh b/t/t6110-rev-list-sparse.sh
index 656ac7f..ddefc7f 100755
--- a/t/t6110-rev-list-sparse.sh
+++ b/t/t6110-rev-list-sparse.sh
@@ -1,6 +1,10 @@
 #!/bin/sh
 
 test_description='operations that cull histories in unusual ways'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -10,7 +14,7 @@ test_expect_success setup '
 	git checkout -b side HEAD^ &&
 	test_commit D &&
 	test_commit E &&
-	git merge master
+	git merge main
 '
 
 test_expect_success 'rev-list --first-parent --boundary' '
diff --git a/t/t6111-rev-list-treesame.sh b/t/t6111-rev-list-treesame.sh
index 4244638..90ff141 100755
--- a/t/t6111-rev-list-treesame.sh
+++ b/t/t6111-rev-list-treesame.sh
@@ -13,6 +13,9 @@
 
 test_description='TREESAME and limiting'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 note () {
@@ -20,7 +23,8 @@ note () {
 }
 
 unnote () {
-	git name-rev --tags --stdin | sed -e "s|$OID_REGEX (tags/\([^)]*\))\([ 	]\)|\1\2|g"
+	git name-rev --tags --annotate-stdin | \
+	sed -e "s|$OID_REGEX (tags/\([^)]*\))\([ 	]\)|\1\2|g"
 }
 
 test_expect_success setup '
@@ -33,13 +37,13 @@ test_expect_success setup '
 	git checkout other-branch &&
 	test_commit "Added other" other "Hello" C &&
 
-	git checkout master &&
+	git checkout main &&
 	test_merge D other-branch &&
 
 	git checkout third-branch &&
 	test_commit "Third file" third "Nothing" E &&
 
-	git checkout master &&
+	git checkout main &&
 	test_commit "file=Blah" file "Blah" F &&
 
 	test_tick && git merge --no-commit third-branch &&
@@ -56,7 +60,7 @@ test_expect_success setup '
 
 	test_tick && git revert I && note J &&
 
-	git checkout master &&
+	git checkout main &&
 	test_tick && git merge --no-ff fiddler-branch &&
 	note K &&
 
diff --git a/t/t6112-rev-list-filters-objects.sh b/t/t6112-rev-list-filters-objects.sh
index de0e5a5..43e1afd 100755
--- a/t/t6112-rev-list-filters-objects.sh
+++ b/t/t6112-rev-list-filters-objects.sh
@@ -2,6 +2,9 @@
 
 test_description='git rev-list using object filtering'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 # Test the blob:none filter.
@@ -13,9 +16,9 @@ test_expect_success 'setup r1' '
 	git init r1 &&
 	for n in 1 2 3 4 5
 	do
-		echo "This is file: $n" > r1/file.$n
-		git -C r1 add file.$n
-		git -C r1 commit -m "$n"
+		echo "This is file: $n" > r1/file.$n &&
+		git -C r1 add file.$n &&
+		git -C r1 commit -m "$n" || return 1
 	done
 '
 
@@ -70,9 +73,9 @@ test_expect_success 'setup r2' '
 	git init r2 &&
 	for n in 1000 10000
 	do
-		printf "%"$n"s" X > r2/large.$n
-		git -C r2 add large.$n
-		git -C r2 commit -m "$n"
+		printf "%"$n"s" X > r2/large.$n &&
+		git -C r2 add large.$n &&
+		git -C r2 commit -m "$n" || return 1
 	done
 '
 
@@ -156,6 +159,78 @@ test_expect_success 'verify blob:limit=1m' '
 	test_must_be_empty observed
 '
 
+# Test object:type=<type> filter.
+
+test_expect_success 'setup object-type' '
+	test_create_repo object-type &&
+	test_commit --no-tag -C object-type message blob &&
+	git -C object-type tag tag -m tag-message
+'
+
+test_expect_success 'verify object:type= fails with invalid type' '
+	test_must_fail git -C object-type rev-list --objects --filter=object:type= HEAD &&
+	test_must_fail git -C object-type rev-list --objects --filter=object:type=invalid HEAD
+'
+
+test_expect_success 'verify object:type=blob prints blob and commit' '
+	git -C object-type rev-parse HEAD >expected &&
+	printf "%s blob\n" $(git -C object-type rev-parse HEAD:blob) >>expected &&
+	git -C object-type rev-list --objects --filter=object:type=blob HEAD >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'verify object:type=tree prints tree and commit' '
+	(
+		git -C object-type rev-parse HEAD &&
+		printf "%s \n" $(git -C object-type rev-parse HEAD^{tree})
+	) >expected &&
+	git -C object-type rev-list --objects --filter=object:type=tree HEAD >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'verify object:type=commit prints commit' '
+	git -C object-type rev-parse HEAD >expected &&
+	git -C object-type rev-list --objects --filter=object:type=commit HEAD >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'verify object:type=tag prints tag' '
+	(
+		git -C object-type rev-parse HEAD &&
+		printf "%s tag\n" $(git -C object-type rev-parse tag)
+	) >expected &&
+	git -C object-type rev-list --objects --filter=object:type=tag tag >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'verify object:type=blob prints only blob with --filter-provided-objects' '
+	printf "%s blob\n" $(git -C object-type rev-parse HEAD:blob) >expected &&
+	git -C object-type rev-list --objects \
+		--filter=object:type=blob --filter-provided-objects HEAD >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'verify object:type=tree prints only tree with --filter-provided-objects' '
+	printf "%s \n" $(git -C object-type rev-parse HEAD^{tree}) >expected &&
+	git -C object-type rev-list --objects \
+		--filter=object:type=tree HEAD --filter-provided-objects >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'verify object:type=commit prints only commit with --filter-provided-objects' '
+	git -C object-type rev-parse HEAD >expected &&
+	git -C object-type rev-list --objects \
+		--filter=object:type=commit --filter-provided-objects HEAD >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'verify object:type=tag prints only tag with --filter-provided-objects' '
+	printf "%s tag\n" $(git -C object-type rev-parse tag) >expected &&
+	git -C object-type rev-list --objects \
+		--filter=object:type=tag --filter-provided-objects tag >actual &&
+	test_cmp expected actual
+'
+
 # Test sparse:path=<path> filter.
 # !!!!
 # NOTE: sparse:path filter support has been dropped for security reasons,
@@ -170,10 +245,10 @@ test_expect_success 'setup r3' '
 	mkdir r3/dir1 &&
 	for n in sparse1 sparse2
 	do
-		echo "This is file: $n" > r3/$n
-		git -C r3 add $n
-		echo "This is file: dir1/$n" > r3/dir1/$n
-		git -C r3 add dir1/$n
+		echo "This is file: $n" > r3/$n &&
+		git -C r3 add $n &&
+		echo "This is file: dir1/$n" > r3/dir1/$n &&
+		git -C r3 add dir1/$n || return 1
 	done &&
 	git -C r3 commit -m "sparse" &&
 	echo dir1/ >pattern1 &&
@@ -223,7 +298,7 @@ test_expect_success 'verify sparse:oid=oid-ish omits top-level files' '
 	sort >expected &&
 
 	git -C r3 rev-list --quiet --objects --filter-print-omitted \
-		--filter=sparse:oid=master:pattern HEAD >revs &&
+		--filter=sparse:oid=main:pattern HEAD >revs &&
 	awk -f print_1.awk revs |
 	sed "s/~//" |
 	sort >observed &&
@@ -382,7 +457,7 @@ expect_invalid_filter_spec () {
 	test_must_fail git -C r3 rev-list --objects --filter="$spec" HEAD \
 		>actual 2>actual_stderr &&
 	test_must_be_empty actual &&
-	test_i18ngrep "$err" actual_stderr
+	test_grep "$err" actual_stderr
 }
 
 test_expect_success 'combine:... while URL-encoding things that should not be' '
@@ -436,7 +511,7 @@ test_expect_success 'add sparse pattern blobs whose paths have reserved chars' '
 
 test_expect_success 'combine:... with more than two sub-filters' '
 	git -C r3 rev-list --objects \
-		--filter=combine:tree:3+blob:limit=40+sparse:oid=master:pattern \
+		--filter=combine:tree:3+blob:limit=40+sparse:oid=main:pattern \
 		HEAD >actual &&
 
 	expect_has HEAD "" &&
@@ -454,7 +529,7 @@ test_expect_success 'combine:... with more than two sub-filters' '
 	cp actual expect &&
 
 	git -C r3 rev-list --objects \
-		--filter=combine:tree:3+blob:limit=40+sparse:oid=master:pattern1%2brenamed%25 \
+		--filter=combine:tree:3+blob:limit=40+sparse:oid=main:pattern1%2brenamed%25 \
 		HEAD >actual &&
 	test_cmp expect actual &&
 
@@ -464,23 +539,23 @@ test_expect_success 'combine:... with more than two sub-filters' '
 	test_when_finished "rm -f trace1" &&
 	GIT_TRACE=$(pwd)/trace1 git -C r3 rev-list --objects \
 		--filter=tree:3 --filter=blob:limit=40 \
-		--filter=sparse:oid="master:p;at%ter+n" \
+		--filter=sparse:oid="main:p;at%ter+n" \
 		HEAD >actual &&
 
 	test_cmp expect actual &&
-	grep "Add to combine filter-spec: sparse:oid=master:p%3bat%25ter%2bn" \
+	grep "Add to combine filter-spec: sparse:oid=main:p%3bat%25ter%2bn" \
 		trace1 &&
 
 	# Repeat the above test, but this time, the characters to encode are in
 	# the LHS of the combined filter.
 	test_when_finished "rm -f trace2" &&
 	GIT_TRACE=$(pwd)/trace2 git -C r3 rev-list --objects \
-		--filter=sparse:oid=master:^~pattern \
+		--filter=sparse:oid=main:^~pattern \
 		--filter=tree:3 --filter=blob:limit=40 \
 		HEAD >actual &&
 
 	test_cmp expect actual &&
-	grep "Add to combine filter-spec: sparse:oid=master:%5e%7epattern" \
+	grep "Add to combine filter-spec: sparse:oid=main:%5e%7epattern" \
 		trace2
 '
 
@@ -595,9 +670,9 @@ test_expect_success 'rev-list W/ --missing=print' '
 	awk -f print_2.awk ls_files_result |
 	sort >expected &&
 
-	for id in `cat expected | sed "s|..|&/|"`
+	for id in `sed "s|..|&/|" expected`
 	do
-		rm r1/.git/objects/$id
+		rm r1/.git/objects/$id || return 1
 	done &&
 
 	git -C r1 rev-list --quiet --missing=print --objects HEAD >revs &&
diff --git a/t/t6113-rev-list-bitmap-filters.sh b/t/t6113-rev-list-bitmap-filters.sh
index 2b551e6..a9656a1 100755
--- a/t/t6113-rev-list-bitmap-filters.sh
+++ b/t/t6113-rev-list-bitmap-filters.sh
@@ -1,7 +1,11 @@
 #!/bin/sh
 
 test_description='rev-list combining bitmaps and filters'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-bitmap.sh
+
 
 test_expect_success 'set up bitmapped repo' '
 	# one commit will have bitmaps, the other will not
@@ -9,7 +13,8 @@ test_expect_success 'set up bitmapped repo' '
 	test_commit much-larger-blob-one &&
 	git repack -adb &&
 	test_commit two &&
-	test_commit much-larger-blob-two
+	test_commit much-larger-blob-two &&
+	git tag tag
 '
 
 test_expect_success 'filters fallback to non-bitmap traversal' '
@@ -74,4 +79,82 @@ test_expect_success 'tree:1 filter' '
 	test_cmp expect actual
 '
 
+test_expect_success 'object:type filter' '
+	git rev-list --objects --filter=object:type=tag tag >expect &&
+	git rev-list --use-bitmap-index \
+		     --objects --filter=object:type=tag tag >actual &&
+	test_cmp expect actual &&
+
+	git rev-list --objects --filter=object:type=commit tag >expect &&
+	git rev-list --use-bitmap-index \
+		     --objects --filter=object:type=commit tag >actual &&
+	test_bitmap_traversal expect actual &&
+
+	git rev-list --objects --filter=object:type=tree tag >expect &&
+	git rev-list --use-bitmap-index \
+		     --objects --filter=object:type=tree tag >actual &&
+	test_bitmap_traversal expect actual &&
+
+	git rev-list --objects --filter=object:type=blob tag >expect &&
+	git rev-list --use-bitmap-index \
+		     --objects --filter=object:type=blob tag >actual &&
+	test_bitmap_traversal expect actual
+'
+
+test_expect_success 'object:type filter with --filter-provided-objects' '
+	git rev-list --objects --filter-provided-objects --filter=object:type=tag tag >expect &&
+	git rev-list --use-bitmap-index \
+		     --objects --filter-provided-objects --filter=object:type=tag tag >actual &&
+	test_cmp expect actual &&
+
+	git rev-list --objects --filter-provided-objects --filter=object:type=commit tag >expect &&
+	git rev-list --use-bitmap-index \
+		     --objects --filter-provided-objects --filter=object:type=commit tag >actual &&
+	test_bitmap_traversal expect actual &&
+
+	git rev-list --objects --filter-provided-objects --filter=object:type=tree tag >expect &&
+	git rev-list --use-bitmap-index \
+		     --objects --filter-provided-objects --filter=object:type=tree tag >actual &&
+	test_bitmap_traversal expect actual &&
+
+	git rev-list --objects --filter-provided-objects --filter=object:type=blob tag >expect &&
+	git rev-list --use-bitmap-index \
+		     --objects --filter-provided-objects --filter=object:type=blob tag >actual &&
+	test_bitmap_traversal expect actual
+'
+
+test_expect_success 'combine filter' '
+	git rev-list --objects --filter=blob:limit=1000 --filter=object:type=blob tag >expect &&
+	git rev-list --use-bitmap-index \
+		     --objects --filter=blob:limit=1000 --filter=object:type=blob tag >actual &&
+	test_bitmap_traversal expect actual
+'
+
+test_expect_success 'combine filter with --filter-provided-objects' '
+	git rev-list --objects --filter-provided-objects --filter=blob:limit=1000 --filter=object:type=blob tag >expect &&
+	git rev-list --use-bitmap-index \
+		     --objects --filter-provided-objects --filter=blob:limit=1000 --filter=object:type=blob tag >actual &&
+	test_bitmap_traversal expect actual &&
+
+	git cat-file --batch-check="%(objecttype) %(objectsize)" <actual >objects &&
+	while read objecttype objectsize
+	do
+		test "$objecttype" = blob || return 1
+		test "$objectsize" -le 1000 || return 1
+	done <objects
+'
+
+test_expect_success 'bitmap traversal with --unpacked' '
+	git repack -adb &&
+	test_commit unpacked &&
+
+	git rev-list --objects --no-object-names unpacked^.. >expect.raw &&
+	sort expect.raw >expect &&
+
+	git rev-list --use-bitmap-index --objects --all --unpacked >actual.raw &&
+	sort actual.raw >actual &&
+
+	test_cmp expect actual
+'
+
 test_done
diff --git a/t/t6114-keep-packs.sh b/t/t6114-keep-packs.sh
new file mode 100755
index 0000000..44246f8
--- /dev/null
+++ b/t/t6114-keep-packs.sh
@@ -0,0 +1,71 @@
+#!/bin/sh
+
+test_description='rev-list with .keep packs'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+test_expect_success 'setup' '
+	test_commit loose &&
+	test_commit packed &&
+	test_commit kept &&
+
+	KEPT_PACK=$(git pack-objects --revs .git/objects/pack/pack <<-EOF
+	refs/tags/kept
+	^refs/tags/packed
+	EOF
+	) &&
+	MISC_PACK=$(git pack-objects --revs .git/objects/pack/pack <<-EOF
+	refs/tags/packed
+	^refs/tags/loose
+	EOF
+	) &&
+
+	touch .git/objects/pack/pack-$KEPT_PACK.keep
+'
+
+rev_list_objects () {
+	git rev-list "$@" >out &&
+	sort out
+}
+
+idx_objects () {
+	git show-index <$1 >expect-idx &&
+	cut -d" " -f2 <expect-idx | sort
+}
+
+test_expect_success '--no-kept-objects excludes trees and blobs in .keep packs' '
+	rev_list_objects --objects --all --no-object-names >kept &&
+	rev_list_objects --objects --all --no-object-names --no-kept-objects >no-kept &&
+
+	idx_objects .git/objects/pack/pack-$KEPT_PACK.idx >expect &&
+	comm -3 kept no-kept >actual &&
+
+	test_cmp expect actual
+'
+
+test_expect_success '--no-kept-objects excludes kept non-MIDX object' '
+	test_config core.multiPackIndex true &&
+
+	# Create a pack with just the commit object in pack, and do not mark it
+	# as kept (even though it appears in $KEPT_PACK, which does have a .keep
+	# file).
+	MIDX_PACK=$(git pack-objects .git/objects/pack/pack <<-EOF
+	$(git rev-parse kept)
+	EOF
+	) &&
+
+	# Write a MIDX containing all packs, but use the version of the commit
+	# at "kept" in a non-kept pack by touching $MIDX_PACK.
+	touch .git/objects/pack/pack-$MIDX_PACK.pack &&
+	git multi-pack-index write &&
+
+	rev_list_objects --objects --no-object-names --no-kept-objects HEAD >actual &&
+	(
+		idx_objects .git/objects/pack/pack-$MISC_PACK.idx &&
+		git rev-list --objects --no-object-names refs/tags/loose
+	) | sort >expect &&
+	test_cmp expect actual
+'
+
+test_done
diff --git a/t/t6115-rev-list-du.sh b/t/t6115-rev-list-du.sh
new file mode 100755
index 0000000..c0cfda6
--- /dev/null
+++ b/t/t6115-rev-list-du.sh
@@ -0,0 +1,80 @@
+#!/bin/sh
+
+test_description='basic tests of rev-list --disk-usage'
+. ./test-lib.sh
+
+# we want a mix of reachable and unreachable, as well as
+# objects in the bitmapped pack and some outside of it
+test_expect_success 'set up repository' '
+	test_commit --no-tag one &&
+	test_commit --no-tag two &&
+	git repack -adb &&
+	git reset --hard HEAD^ &&
+	test_commit --no-tag three &&
+	test_commit --no-tag four &&
+	git reset --hard HEAD^
+'
+
+# We don't want to hardcode sizes, because they depend on the exact details of
+# packing, zlib, etc. We'll assume that the regular rev-list and cat-file
+# machinery works and compare the --disk-usage output to that.
+disk_usage_slow () {
+	git rev-list --no-object-names "$@" |
+	git cat-file --batch-check="%(objectsize:disk)" |
+	perl -lne '$total += $_; END { print $total}'
+}
+
+# check behavior with given rev-list options; note that
+# whitespace is not preserved in args
+check_du () {
+	args=$*
+
+	test_expect_success "generate expected size ($args)" "
+		disk_usage_slow $args >expect
+	"
+
+	test_expect_success "rev-list --disk-usage without bitmaps ($args)" "
+		git rev-list --disk-usage $args >actual &&
+		test_cmp expect actual
+	"
+
+	test_expect_success "rev-list --disk-usage with bitmaps ($args)" "
+		git rev-list --disk-usage --use-bitmap-index $args >actual &&
+		test_cmp expect actual
+	"
+}
+
+check_du HEAD
+check_du --objects HEAD
+check_du --objects HEAD^..HEAD
+
+test_expect_success 'setup for --unpacked tests' '
+	git repack -adb &&
+	test_commit unpacked
+'
+
+check_du --all --objects --unpacked
+
+# As mentioned above, don't use hardcode sizes as actual size, but use the
+# output from git cat-file.
+test_expect_success 'rev-list --disk-usage=human' '
+	git rev-list --objects HEAD --disk-usage=human >actual &&
+	disk_usage_slow --objects HEAD >actual_size &&
+	grep "$(cat actual_size) bytes" actual
+'
+
+test_expect_success 'rev-list --disk-usage=human with bitmaps' '
+	git rev-list --objects HEAD --use-bitmap-index --disk-usage=human >actual &&
+	disk_usage_slow --objects HEAD >actual_size &&
+	grep "$(cat actual_size) bytes" actual
+'
+
+test_expect_success 'rev-list use --disk-usage unproperly' '
+	test_must_fail git rev-list --objects HEAD --disk-usage=typo 2>err &&
+	cat >expect <<-\EOF &&
+	fatal: invalid value for '\''--disk-usage=<format>'\'': '\''typo'\'', the only allowed format is '\''human'\''
+	EOF
+	test_cmp err expect
+'
+
+test_done
diff --git a/t/t6120-describe.sh b/t/t6120-describe.sh
index f822d5d..e78315d 100755
--- a/t/t6120-describe.sh
+++ b/t/t6120-describe.sh
@@ -11,106 +11,98 @@ test_description='test describe'
 #
 # First parent of a merge commit is on the same line, second parent below.
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 check_describe () {
+	indir= &&
+	while test $# != 0
+	do
+		case "$1" in
+		-C)
+			indir="$2"
+			shift
+			;;
+		*)
+			break
+			;;
+		esac
+		shift
+	done &&
+	indir=${indir:+"$indir"/} &&
 	expect="$1"
 	shift
 	describe_opts="$@"
 	test_expect_success "describe $describe_opts" '
-	R=$(git describe $describe_opts 2>err.actual) &&
-	case "$R" in
-	$expect)	echo happy ;;
-	*)	echo "Oops - $R is not $expect" &&
-		false ;;
-	esac
+		git ${indir:+ -C "$indir"} describe $describe_opts >raw &&
+		sed -e "s/-g[0-9a-f]*\$/-gHASH/" <raw >actual &&
+		echo "$expect" >expect &&
+		test_cmp expect actual
 	'
 }
 
 test_expect_success setup '
+	test_commit initial file one &&
+	test_commit second file two &&
+	test_commit third file three &&
+	test_commit --annotate A file A &&
+	test_commit c file c &&
 
-	test_tick &&
-	echo one >file && git add file && git commit -m initial &&
-	one=$(git rev-parse HEAD) &&
-
-	git describe --always HEAD &&
-
-	test_tick &&
-	echo two >file && git add file && git commit -m second &&
-	two=$(git rev-parse HEAD) &&
-
-	test_tick &&
-	echo three >file && git add file && git commit -m third &&
-
-	test_tick &&
-	echo A >file && git add file && git commit -m A &&
-	test_tick &&
-	git tag -a -m A A &&
-
-	test_tick &&
-	echo c >file && git add file && git commit -m c &&
-	test_tick &&
-	git tag c &&
-
-	git reset --hard $two &&
-	test_tick &&
-	echo B >side && git add side && git commit -m B &&
-	test_tick &&
-	git tag -a -m B B &&
+	git reset --hard second &&
+	test_commit --annotate B side B &&
 
 	test_tick &&
 	git merge -m Merged c &&
 	merged=$(git rev-parse HEAD) &&
 
-	git reset --hard $two &&
-	test_tick &&
-	echo D >another && git add another && git commit -m D &&
-	test_tick &&
-	git tag -a -m D D &&
-	test_tick &&
-	git tag -a -m R R &&
-
-	test_tick &&
-	echo DD >another && git commit -a -m another &&
+	git reset --hard second &&
+	test_commit --no-tag D another D &&
 
 	test_tick &&
-	git tag e &&
+	git tag -a -m R R &&
 
-	test_tick &&
-	echo DDD >another && git commit -a -m "yet another" &&
+	test_commit e another DD &&
+	test_commit --no-tag "yet another" another DDD &&
 
 	test_tick &&
 	git merge -m Merged $merged &&
 
-	test_tick &&
-	echo X >file && echo X >side && git add file side &&
-	git commit -m x
-
+	test_commit --no-tag x file
 '
 
-check_describe A-* HEAD
-check_describe A-* HEAD^
-check_describe R-* HEAD^^
-check_describe A-* HEAD^^2
+check_describe A-8-gHASH HEAD
+check_describe A-7-gHASH HEAD^
+check_describe R-2-gHASH HEAD^^
+check_describe A-3-gHASH HEAD^^2
 check_describe B HEAD^^2^
-check_describe R-* HEAD^^^
+check_describe R-1-gHASH HEAD^^^
 
-check_describe c-* --tags HEAD
-check_describe c-* --tags HEAD^
-check_describe e-* --tags HEAD^^
-check_describe c-* --tags HEAD^^2
+check_describe c-7-gHASH --tags HEAD
+check_describe c-6-gHASH --tags HEAD^
+check_describe e-1-gHASH --tags HEAD^^
+check_describe c-2-gHASH --tags HEAD^^2
 check_describe B --tags HEAD^^2^
 check_describe e --tags HEAD^^^
+check_describe e --tags --exact-match HEAD^^^
 
-check_describe heads/master --all HEAD
-check_describe tags/c-* --all HEAD^
+check_describe heads/main --all HEAD
+check_describe tags/c-6-gHASH --all HEAD^
 check_describe tags/e --all HEAD^^^
 
-check_describe B-0-* --long HEAD^^2^
-check_describe A-3-* --long HEAD^^2
+check_describe B-0-gHASH --long HEAD^^2^
+check_describe A-3-gHASH --long HEAD^^2
+
+check_describe c-7-gHASH --tags
+check_describe e-3-gHASH --first-parent --tags
+
+check_describe c-7-gHASH --tags --no-exact-match HEAD
+check_describe e-3-gHASH --first-parent --tags --no-exact-match HEAD
 
-check_describe c-7-* --tags
-check_describe e-3-* --first-parent --tags
+test_expect_success '--exact-match failure' '
+	test_must_fail git describe --exact-match HEAD 2>err
+'
 
 test_expect_success 'describe --contains defaults to HEAD without commit-ish' '
 	echo "A^0" >expect &&
@@ -121,20 +113,18 @@ test_expect_success 'describe --contains defaults to HEAD without commit-ish' '
 '
 
 check_describe tags/A --all A^0
-test_expect_success 'no warning was displayed for A' '
-	test_must_be_empty err.actual
-'
 
-test_expect_success 'rename tag A to Q locally' '
-	mv .git/refs/tags/A .git/refs/tags/Q
-'
-cat - >err.expect <<EOF
-warning: tag 'Q' is externally known as 'A'
-EOF
-check_describe A-* HEAD
-test_expect_success 'warning was displayed for Q' '
-	test_i18ncmp err.expect err.actual
-'
+test_expect_success 'renaming tag A to Q locally produces a warning' "
+	git update-ref refs/tags/Q $(git rev-parse refs/tags/A) &&
+	git update-ref -d refs/tags/A &&
+	git describe HEAD 2>err >out &&
+	cat >expected <<-\EOF &&
+	warning: tag 'Q' is externally known as 'A'
+	EOF
+	test_cmp expected err &&
+	grep -E '^A-8-g[0-9a-f]+$' out
+"
+
 test_expect_success 'misnamed annotated tag forces long output' '
 	description=$(git describe --no-long Q^0) &&
 	expr "$description" : "A-0-g[0-9a-f]*$" &&
@@ -154,50 +144,51 @@ test_expect_success 'abbrev=0 will not break misplaced tag (2)' '
 '
 
 test_expect_success 'rename tag Q back to A' '
-	mv .git/refs/tags/Q .git/refs/tags/A
+	git update-ref refs/tags/A $(git rev-parse refs/tags/Q) &&
+	git update-ref -d refs/tags/Q
 '
 
 test_expect_success 'pack tag refs' 'git pack-refs'
-check_describe A-* HEAD
+check_describe A-8-gHASH HEAD
 
 test_expect_success 'describe works from outside repo using --git-dir' '
 	git clone --bare "$TRASH_DIRECTORY" "$TRASH_DIRECTORY/bare" &&
 	git --git-dir "$TRASH_DIRECTORY/bare" describe >out &&
-	grep -E "^A-[1-9][0-9]?-g[0-9a-f]+$" out
+	grep -E "^A-8-g[0-9a-f]+$" out
 '
 
-check_describe "A-*[0-9a-f]" --dirty
+check_describe "A-8-gHASH" --dirty
 
 test_expect_success 'describe --dirty with --work-tree' '
 	(
 		cd "$TEST_DIRECTORY" &&
 		git --git-dir "$TRASH_DIRECTORY/.git" --work-tree "$TRASH_DIRECTORY" describe --dirty >"$TRASH_DIRECTORY/out"
 	) &&
-	grep -E "^A-[1-9][0-9]?-g[0-9a-f]+$" out
+	grep -E "^A-8-g[0-9a-f]+$" out
 '
 
 test_expect_success 'set-up dirty work tree' '
 	echo >>file
 '
 
-check_describe "A-*[0-9a-f]-dirty" --dirty
-
 test_expect_success 'describe --dirty with --work-tree (dirty)' '
+	git describe --dirty >expected &&
 	(
 		cd "$TEST_DIRECTORY" &&
 		git --git-dir "$TRASH_DIRECTORY/.git" --work-tree "$TRASH_DIRECTORY" describe --dirty >"$TRASH_DIRECTORY/out"
 	) &&
-	grep -E "^A-[1-9][0-9]?-g[0-9a-f]+-dirty$" out
+	grep -E "^A-8-g[0-9a-f]+-dirty$" out &&
+	test_cmp expected out
 '
 
-check_describe "A-*[0-9a-f].mod" --dirty=.mod
-
 test_expect_success 'describe --dirty=.mod with --work-tree (dirty)' '
+	git describe --dirty=.mod >expected &&
 	(
 		cd "$TEST_DIRECTORY" &&
 		git --git-dir "$TRASH_DIRECTORY/.git" --work-tree "$TRASH_DIRECTORY" describe --dirty=.mod >"$TRASH_DIRECTORY/out"
 	) &&
-	grep -E "^A-[1-9][0-9]?-g[0-9a-f]+.mod$" out
+	grep -E "^A-8-g[0-9a-f]+.mod$" out &&
+	test_cmp expected out
 '
 
 test_expect_success 'describe --dirty HEAD' '
@@ -220,21 +211,21 @@ test_expect_success 'set-up matching pattern tests' '
 
 '
 
-check_describe "test-annotated-*" --match="test-*"
+check_describe "test-annotated-3-gHASH" --match="test-*"
 
-check_describe "test1-lightweight-*" --tags --match="test1-*"
+check_describe "test1-lightweight-2-gHASH" --tags --match="test1-*"
 
-check_describe "test2-lightweight-*" --tags --match="test2-*"
+check_describe "test2-lightweight-1-gHASH" --tags --match="test2-*"
 
-check_describe "test2-lightweight-*" --long --tags --match="test2-*" HEAD^
+check_describe "test2-lightweight-0-gHASH" --long --tags --match="test2-*" HEAD^
 
-check_describe "test2-lightweight-*" --long --tags --match="test1-*" --match="test2-*" HEAD^
+check_describe "test2-lightweight-0-gHASH" --long --tags --match="test1-*" --match="test2-*" HEAD^
 
-check_describe "test2-lightweight-*" --long --tags --match="test1-*" --no-match --match="test2-*" HEAD^
+check_describe "test2-lightweight-0-gHASH" --long --tags --match="test1-*" --no-match --match="test2-*" HEAD^
 
-check_describe "test1-lightweight-*" --long --tags --match="test1-*" --match="test3-*" HEAD
+check_describe "test1-lightweight-2-gHASH" --long --tags --match="test1-*" --match="test3-*" HEAD
 
-check_describe "test1-lightweight-*" --long --tags --match="test3-*" --match="test1-*" HEAD
+check_describe "test1-lightweight-2-gHASH" --long --tags --match="test3-*" --match="test1-*" HEAD
 
 test_expect_success 'set-up branches' '
 	git branch branch_A A &&
@@ -244,11 +235,11 @@ test_expect_success 'set-up branches' '
 	git update-ref refs/original/original_branch_A test-annotated~2
 '
 
-check_describe "heads/branch_A*" --all --match="branch_*" --exclude="branch_C" HEAD
+check_describe "heads/branch_A-11-gHASH" --all --match="branch_*" --exclude="branch_C" HEAD
 
-check_describe "remotes/origin/remote_branch_A*" --all --match="origin/remote_branch_*" --exclude="origin/remote_branch_C" HEAD
+check_describe "remotes/origin/remote_branch_A-11-gHASH" --all --match="origin/remote_branch_*" --exclude="origin/remote_branch_C" HEAD
 
-check_describe "original/original_branch_A*" --all test-annotated~1
+check_describe "original/original_branch_A-6-gHASH" --all test-annotated~1
 
 test_expect_success '--match does not work for other types' '
 	test_must_fail git describe --all --match="*original_branch_*" test-annotated~1
@@ -279,7 +270,7 @@ test_expect_success 'name-rev --all' '
 	>expect.unsorted &&
 	for rev in $(git rev-list --all)
 	do
-		git name-rev $rev >>expect.unsorted
+		git name-rev $rev >>expect.unsorted || return 1
 	done &&
 	sort <expect.unsorted >expect &&
 	git name-rev --all >actual.unsorted &&
@@ -287,19 +278,24 @@ test_expect_success 'name-rev --all' '
 	test_cmp expect actual
 '
 
-test_expect_success 'name-rev --stdin' '
+test_expect_success 'name-rev --annotate-stdin' '
 	>expect.unsorted &&
 	for rev in $(git rev-list --all)
 	do
 		name=$(git name-rev --name-only $rev) &&
-		echo "$rev ($name)" >>expect.unsorted
+		echo "$rev ($name)" >>expect.unsorted || return 1
 	done &&
 	sort <expect.unsorted >expect &&
-	git rev-list --all | git name-rev --stdin >actual.unsorted &&
+	git rev-list --all | git name-rev --annotate-stdin >actual.unsorted &&
 	sort <actual.unsorted >actual &&
 	test_cmp expect actual
 '
 
+test_expect_success 'name-rev --stdin deprecated' "
+	git rev-list --all | git name-rev --stdin 2>actual &&
+	grep -E 'warning: --stdin is deprecated' actual
+"
+
 test_expect_success 'describe --contains with the exact tags' '
 	echo "A^0" >expect &&
 	tag_object=$(git rev-parse refs/tags/A) &&
@@ -396,22 +392,25 @@ test_expect_success 'describe directly tagged blob' '
 test_expect_success 'describe tag object' '
 	git tag test-blob-1 -a -m msg unique-file:file &&
 	test_must_fail git describe test-blob-1 2>actual &&
-	test_i18ngrep "fatal: test-blob-1 is neither a commit nor blob" actual
+	test_grep "fatal: test-blob-1 is neither a commit nor blob" actual
 '
 
 test_expect_success ULIMIT_STACK_SIZE 'name-rev works in a deep repo' '
 	i=1 &&
 	while test $i -lt 8000
 	do
-		echo "commit refs/heads/master
+		echo "commit refs/heads/main
 committer A U Thor <author@example.com> $((1000000000 + $i * 100)) +0200
 data <<EOF
 commit #$i
-EOF"
-		test $i = 1 && echo "from refs/heads/master^0"
-		i=$(($i + 1))
+EOF" &&
+		if test $i = 1
+		then
+			echo "from refs/heads/main^0"
+		fi &&
+		i=$(($i + 1)) || return 1
 	done | git fast-import &&
-	git checkout master &&
+	git checkout main &&
 	git tag far-far-away HEAD^ &&
 	echo "HEAD~4000 tags/far-far-away~3999" >expect &&
 	git name-rev HEAD~4000 >actual &&
@@ -442,7 +441,7 @@ test_expect_success 'describe complains about missing object' '
 '
 
 test_expect_success 'name-rev a rev shortly after epoch' '
-	test_when_finished "git checkout master" &&
+	test_when_finished "git checkout main" &&
 
 	git checkout --orphan no-timestamp-underflow &&
 	# Any date closer to epoch than the CUTOFF_DATE_SLOP constant
@@ -456,7 +455,7 @@ test_expect_success 'name-rev a rev shortly after epoch' '
 	test_cmp expect actual
 '
 
-# A--------------master
+# A--------------main
 #  \            /
 #   \----------M2
 #    \        /
@@ -487,23 +486,141 @@ test_expect_success 'name-rev covers all conditions while looking at parents' '
 		git checkout $A &&
 		git merge --no-ff HEAD@{1} && # M2
 
-		git checkout master &&
+		git checkout main &&
 		git merge --no-ff HEAD@{1} &&
 
-		echo "$B master^2^2~1^2" >expect &&
+		echo "$B main^2^2~1^2" >expect &&
 		git name-rev $B >actual &&
 
 		test_cmp expect actual
 	)
 '
 
+# A-B-C-D-E-main
+#
+# Where C has a non-monotonically increasing commit timestamp w.r.t. other
+# commits
+test_expect_success 'non-monotonic commit dates setup' '
+	UNIX_EPOCH_ZERO="@0 +0000" &&
+	git init non-monotonic &&
+	test_commit -C non-monotonic A &&
+	test_commit -C non-monotonic --no-tag B &&
+	test_commit -C non-monotonic --no-tag --date "$UNIX_EPOCH_ZERO" C &&
+	test_commit -C non-monotonic D &&
+	test_commit -C non-monotonic E
+'
+
+test_expect_success 'name-rev with commitGraph handles non-monotonic timestamps' '
+	test_config -C non-monotonic core.commitGraph true &&
+	(
+		cd non-monotonic &&
+
+		git commit-graph write --reachable &&
+
+		echo "main~3 tags/D~2" >expect &&
+		git name-rev --tags main~3 >actual &&
+
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'name-rev --all works with non-monotonic timestamps' '
+	test_config -C non-monotonic core.commitGraph false &&
+	(
+		cd non-monotonic &&
+
+		rm -rf .git/info/commit-graph* &&
+
+		cat >tags <<-\EOF &&
+		tags/E
+		tags/D
+		tags/D~1
+		tags/D~2
+		tags/A
+		EOF
+
+		git log --pretty=%H >revs &&
+
+		paste -d" " revs tags | sort >expect &&
+
+		git name-rev --tags --all | sort >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'name-rev --annotate-stdin works with non-monotonic timestamps' '
+	test_config -C non-monotonic core.commitGraph false &&
+	(
+		cd non-monotonic &&
+
+		rm -rf .git/info/commit-graph* &&
+
+		cat >expect <<-\EOF &&
+		E
+		D
+		D~1
+		D~2
+		A
+		EOF
+
+		git log --pretty=%H >revs &&
+		git name-rev --tags --annotate-stdin --name-only <revs >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'name-rev --all works with commitGraph' '
+	test_config -C non-monotonic core.commitGraph true &&
+	(
+		cd non-monotonic &&
+
+		git commit-graph write --reachable &&
+
+		cat >tags <<-\EOF &&
+		tags/E
+		tags/D
+		tags/D~1
+		tags/D~2
+		tags/A
+		EOF
+
+		git log --pretty=%H >revs &&
+
+		paste -d" " revs tags | sort >expect &&
+
+		git name-rev --tags --all | sort >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'name-rev --annotate-stdin works with commitGraph' '
+	test_config -C non-monotonic core.commitGraph true &&
+	(
+		cd non-monotonic &&
+
+		git commit-graph write --reachable &&
+
+		cat >expect <<-\EOF &&
+		E
+		D
+		D~1
+		D~2
+		A
+		EOF
+
+		git log --pretty=%H >revs &&
+		git name-rev --tags --annotate-stdin --name-only <revs >actual &&
+		test_cmp expect actual
+	)
+'
+
 #               B
 #               o
 #                \
 #  o-----o---o----x
 #        A
 #
-test_expect_success 'describe commits with disjoint bases' '
+test_expect_success 'setup: describe commits with disjoint bases' '
 	git init disjoint1 &&
 	(
 		cd disjoint1 &&
@@ -516,19 +633,19 @@ test_expect_success 'describe commits with disjoint bases' '
 		git checkout --orphan branch && rm file &&
 		echo B > file2 && git add file2 && git commit -m B &&
 		git tag B -a -m B &&
-		git merge --no-ff --allow-unrelated-histories master -m x &&
-
-		check_describe "A-3-*" HEAD
+		git merge --no-ff --allow-unrelated-histories main -m x
 	)
 '
 
+check_describe -C disjoint1 "A-3-gHASH" HEAD
+
 #           B
 #   o---o---o------------.
 #                         \
 #                  o---o---x
 #                  A
 #
-test_expect_success 'describe commits with disjoint bases 2' '
+test_expect_success 'setup: describe commits with disjoint bases 2' '
 	git init disjoint2 &&
 	(
 		cd disjoint2 &&
@@ -542,10 +659,16 @@ test_expect_success 'describe commits with disjoint bases 2' '
 		echo o >> file2 && git add file2 && GIT_COMMITTER_DATE="2020-01-01 15:01" git commit -m o &&
 		echo B >> file2 && git add file2 && GIT_COMMITTER_DATE="2020-01-01 15:02" git commit -m B &&
 		git tag B -a -m B &&
-		git merge --no-ff --allow-unrelated-histories master -m x &&
-
-		check_describe "B-3-*" HEAD
+		git merge --no-ff --allow-unrelated-histories main -m x
 	)
 '
 
+check_describe -C disjoint2 "B-3-gHASH" HEAD
+
+test_expect_success 'setup misleading taggerdates' '
+	GIT_COMMITTER_DATE="2006-12-12 12:31" git tag -a -m "another tag" newer-tag-older-commit unique-file~1
+'
+
+check_describe newer-tag-older-commit~1 --contains unique-file~2
+
 test_done
diff --git a/t/t6131-pathspec-icase.sh b/t/t6131-pathspec-icase.sh
index 39fc3f6..770cce0 100755
--- a/t/t6131-pathspec-icase.sh
+++ b/t/t6131-pathspec-icase.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='test case insensitive pathspec limiting'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 if test_have_prereq CASE_INSENSITIVE_FS
diff --git a/t/t6132-pathspec-exclude.sh b/t/t6132-pathspec-exclude.sh
index 30328b8..9fdafeb 100755
--- a/t/t6132-pathspec-exclude.sh
+++ b/t/t6132-pathspec-exclude.sh
@@ -11,7 +11,7 @@ test_expect_success 'setup' '
 		fi &&
 		: >$p &&
 		git add $p &&
-		git commit -m $p
+		git commit -m $p || return 1
 	done &&
 	git log --oneline --format=%s >actual &&
 	cat <<EOF >expect &&
@@ -195,6 +195,7 @@ test_expect_success 'multiple exclusions' '
 '
 
 test_expect_success 't_e_i() exclude case #8' '
+	test_when_finished "rm -fr case8" &&
 	git init case8 &&
 	(
 		cd case8 &&
@@ -244,4 +245,184 @@ test_expect_success 'grep --untracked PATTERN :(exclude)*FILE' '
 	test_cmp expect-grep actual-grep
 '
 
+# Depending on the command, all negative pathspec needs to subtract
+# either from the full tree, or from the current directory.
+#
+# The sample tree checked out at this point has:
+# file
+# sub/file
+# sub/file2
+# sub/sub/file
+# sub/sub/sub/file
+# sub2/file
+#
+# but there may also be some cruft that interferes with "git clean"
+# and "git add" tests.
+
+test_expect_success 'archive with all negative' '
+	git reset --hard &&
+	git clean -f &&
+	git -C sub archive --format=tar HEAD -- ":!sub/" >archive &&
+	"$TAR" tf archive >actual &&
+	cat >expect <<-\EOF &&
+	file
+	file2
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'add with all negative' '
+	H=$(git rev-parse HEAD) &&
+	git reset --hard $H &&
+	git clean -f &&
+	test_when_finished "git reset --hard $H" &&
+	for path in file sub/file sub/sub/file sub2/file
+	do
+		echo smudge >>"$path" || return 1
+	done &&
+	git -C sub add -- ":!sub/" &&
+	git diff --name-only --no-renames --cached >actual &&
+	cat >expect <<-\EOF &&
+	file
+	sub/file
+	sub2/file
+	EOF
+	test_cmp expect actual &&
+	git diff --name-only --no-renames >actual &&
+	echo sub/sub/file >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'add -p with all negative' '
+	H=$(git rev-parse HEAD) &&
+	git reset --hard $H &&
+	git clean -f &&
+	test_when_finished "git reset --hard $H" &&
+	for path in file sub/file sub/sub/file sub2/file
+	do
+		echo smudge >>"$path" || return 1
+	done &&
+	yes | git -C sub add -p -- ":!sub/" &&
+	git diff --name-only --no-renames --cached >actual &&
+	cat >expect <<-\EOF &&
+	file
+	sub/file
+	sub2/file
+	EOF
+	test_cmp expect actual &&
+	git diff --name-only --no-renames >actual &&
+	echo sub/sub/file >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'clean with all negative' '
+	H=$(git rev-parse HEAD) &&
+	git reset --hard $H &&
+	test_when_finished "git reset --hard $H && git clean -f" &&
+	git clean -f &&
+	for path in file9 sub/file9 sub/sub/file9 sub2/file9
+	do
+		echo cruft >"$path" || return 1
+	done &&
+	git -C sub clean -f -- ":!sub" &&
+	test_path_is_file file9 &&
+	test_path_is_missing sub/file9 &&
+	test_path_is_file sub/sub/file9 &&
+	test_path_is_file sub2/file9
+'
+
+test_expect_success 'commit with all negative' '
+	H=$(git rev-parse HEAD) &&
+	git reset --hard $H &&
+	test_when_finished "git reset --hard $H" &&
+	for path in file sub/file sub/sub/file sub2/file
+	do
+		echo smudge >>"$path" || return 1
+	done &&
+	git -C sub commit -m sample -- ":!sub/" &&
+	git diff --name-only --no-renames HEAD^ HEAD >actual &&
+	cat >expect <<-\EOF &&
+	file
+	sub/file
+	sub2/file
+	EOF
+	test_cmp expect actual &&
+	git diff --name-only --no-renames HEAD >actual &&
+	echo sub/sub/file >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'reset with all negative' '
+	H=$(git rev-parse HEAD) &&
+	git reset --hard $H &&
+	test_when_finished "git reset --hard $H" &&
+	for path in file sub/file sub/sub/file sub2/file
+	do
+		echo smudge >>"$path" &&
+		git add "$path" || return 1
+	done &&
+	git -C sub reset --quiet -- ":!sub/" &&
+	git diff --name-only --no-renames --cached >actual &&
+	echo sub/sub/file >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'grep with all negative' '
+	H=$(git rev-parse HEAD) &&
+	git reset --hard $H &&
+	test_when_finished "git reset --hard $H" &&
+	for path in file sub/file sub/sub/file sub2/file
+	do
+		echo "needle $path" >>"$path" || return 1
+	done &&
+	git -C sub grep -h needle -- ":!sub/" >actual &&
+	cat >expect <<-\EOF &&
+	needle sub/file
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'ls-files with all negative' '
+	git reset --hard &&
+	git -C sub ls-files -- ":!sub/" >actual &&
+	cat >expect <<-\EOF &&
+	file
+	file2
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'rm with all negative' '
+	git reset --hard &&
+	test_when_finished "git reset --hard" &&
+	git -C sub rm -r --cached -- ":!sub/" >actual &&
+	git diff --name-only --no-renames --diff-filter=D --cached >actual &&
+	cat >expect <<-\EOF &&
+	sub/file
+	sub/file2
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'stash with all negative' '
+	H=$(git rev-parse HEAD) &&
+	git reset --hard $H &&
+	test_when_finished "git reset --hard $H" &&
+	for path in file sub/file sub/sub/file sub2/file
+	do
+		echo smudge >>"$path" || return 1
+	done &&
+	git -C sub stash push -m sample -- ":!sub/" &&
+	git diff --name-only --no-renames HEAD >actual &&
+	echo sub/sub/file >expect &&
+	test_cmp expect actual &&
+	git stash show --name-only >actual &&
+	cat >expect <<-\EOF &&
+	file
+	sub/file
+	sub2/file
+	EOF
+	test_cmp expect actual
+'
+
 test_done
diff --git a/t/t6134-pathspec-in-submodule.sh b/t/t6134-pathspec-in-submodule.sh
index c670668..16ce4cf 100755
--- a/t/t6134-pathspec-in-submodule.sh
+++ b/t/t6134-pathspec-in-submodule.sh
@@ -2,6 +2,7 @@
 
 test_description='test case exclude pathspec'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup a submodule' '
@@ -9,7 +10,7 @@ test_expect_success 'setup a submodule' '
 	: >pretzel/a &&
 	git -C pretzel add a &&
 	git -C pretzel commit -m "add a file" -- a &&
-	git submodule add ./pretzel sub &&
+	git -c protocol.file.allow=always submodule add ./pretzel sub &&
 	git commit -a -m "add submodule" &&
 	git submodule deinit --all
 '
@@ -21,12 +22,12 @@ EOF
 test_expect_success 'error message for path inside submodule' '
 	echo a >sub/a &&
 	test_must_fail git add sub/a 2>actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 test_expect_success 'error message for path inside submodule from within submodule' '
 	test_must_fail git -C sub add . 2>actual &&
-	test_i18ngrep "in unpopulated submodule" actual
+	test_grep "in unpopulated submodule" actual
 '
 
 test_done
diff --git a/t/t6135-pathspec-with-attrs.sh b/t/t6135-pathspec-with-attrs.sh
index 457cc16..120dcd7 100755
--- a/t/t6135-pathspec-with-attrs.sh
+++ b/t/t6135-pathspec-with-attrs.sh
@@ -64,11 +64,24 @@ test_expect_success 'setup .gitattributes' '
 	fileSetLabel label
 	fileValue label=foo
 	fileWrongLabel label☺
+	newFileA* labelA
+	newFileB* labelB
 	EOF
-	git add .gitattributes &&
+	echo fileSetLabel label1 >sub/.gitattributes &&
+	git add .gitattributes sub/.gitattributes &&
 	git commit -m "add attributes"
 '
 
+test_expect_success 'setup .gitignore' '
+	cat <<-\EOF >.gitignore &&
+	actual
+	expect
+	pathspec_file
+	EOF
+	git add .gitignore &&
+	git commit -m "add gitignore"
+'
+
 test_expect_success 'check specific set attr' '
 	cat <<-\EOF >expect &&
 	fileSetLabel
@@ -78,7 +91,17 @@ test_expect_success 'check specific set attr' '
 	test_cmp expect actual
 '
 
-test_expect_success 'check specific set attr (2)' '
+test_expect_success 'check set attr with pathspec pattern' '
+	echo sub/fileSetLabel >expect &&
+
+	git ls-files ":(attr:label)sub" >actual &&
+	test_cmp expect actual &&
+
+	git ls-files ":(attr:label)sub/" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'check specific set attr in tree-ish' '
 	cat <<-\EOF >expect &&
 	HEAD:fileSetLabel
 	HEAD:sub/fileSetLabel
@@ -87,6 +110,16 @@ test_expect_success 'check specific set attr (2)' '
 	test_cmp expect actual
 '
 
+test_expect_success 'check specific set attr with pathspec pattern in tree-ish' '
+	echo HEAD:sub/fileSetLabel >expect &&
+
+	git grep -l content HEAD ":(attr:label)sub" >actual &&
+	test_cmp expect actual &&
+
+	git grep -l content HEAD ":(attr:label)sub/" >actual &&
+	test_cmp expect actual
+'
+
 test_expect_success 'check specific unset attr' '
 	cat <<-\EOF >expect &&
 	fileUnsetLabel
@@ -129,6 +162,7 @@ test_expect_success 'check specific value attr (2)' '
 test_expect_success 'check unspecified attr' '
 	cat <<-\EOF >expect &&
 	.gitattributes
+	.gitignore
 	fileA
 	fileAB
 	fileAC
@@ -137,6 +171,7 @@ test_expect_success 'check unspecified attr' '
 	fileC
 	fileNoLabel
 	fileWrongLabel
+	sub/.gitattributes
 	sub/fileA
 	sub/fileAB
 	sub/fileAC
@@ -153,6 +188,7 @@ test_expect_success 'check unspecified attr' '
 test_expect_success 'check unspecified attr (2)' '
 	cat <<-\EOF >expect &&
 	HEAD:.gitattributes
+	HEAD:.gitignore
 	HEAD:fileA
 	HEAD:fileAB
 	HEAD:fileAC
@@ -161,6 +197,7 @@ test_expect_success 'check unspecified attr (2)' '
 	HEAD:fileC
 	HEAD:fileNoLabel
 	HEAD:fileWrongLabel
+	HEAD:sub/.gitattributes
 	HEAD:sub/fileA
 	HEAD:sub/fileAB
 	HEAD:sub/fileAC
@@ -177,9 +214,11 @@ test_expect_success 'check unspecified attr (2)' '
 test_expect_success 'check multiple unspecified attr' '
 	cat <<-\EOF >expect &&
 	.gitattributes
+	.gitignore
 	fileC
 	fileNoLabel
 	fileWrongLabel
+	sub/.gitattributes
 	sub/fileC
 	sub/fileNoLabel
 	sub/fileWrongLabel
@@ -212,17 +251,100 @@ test_expect_success 'check label excluding other labels' '
 
 test_expect_success 'fail on multiple attr specifiers in one pathspec item' '
 	test_must_fail git ls-files . ":(attr:labelB,attr:labelC)" 2>actual &&
-	test_i18ngrep "Only one" actual
+	test_grep "Only one" actual
 '
 
-test_expect_success 'fail if attr magic is used places not implemented' '
+test_expect_success 'fail if attr magic is used in places not implemented' '
 	# The main purpose of this test is to check that we actually fail
 	# when you attempt to use attr magic in commands that do not implement
-	# attr magic. This test does not advocate git-add to stay that way,
-	# though, but git-add is convenient as it has its own internal pathspec
-	# parsing.
-	test_must_fail git add ":(attr:labelB)" 2>actual &&
-	test_i18ngrep "magic not supported" actual
+	# attr magic. This test does not advocate check-ignore to stay that way.
+	# When you teach the command to grok the pathspec, you need to find
+	# another command to replace it for the test.
+	test_must_fail git check-ignore ":(attr:labelB)" 2>actual &&
+	test_grep "magic not supported" actual
+'
+
+test_expect_success 'check that attr magic works for git stash push' '
+	cat <<-\EOF >expect &&
+	A	sub/newFileA-foo
+	EOF
+	>sub/newFileA-foo &&
+	>sub/newFileB-foo &&
+	git stash push --include-untracked -- ":(exclude,attr:labelB)" &&
+	git stash show --include-untracked --name-status >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'check that attr magic works for git add --all' '
+	cat <<-\EOF >expect &&
+	sub/newFileA-foo
+	EOF
+	>sub/newFileA-foo &&
+	>sub/newFileB-foo &&
+	git add --all ":(exclude,attr:labelB)" &&
+	git diff --name-only --cached >actual &&
+	git restore -W -S . &&
+	test_cmp expect actual
+'
+
+test_expect_success 'check that attr magic works for git add -u' '
+	cat <<-\EOF >expect &&
+	sub/fileA
+	EOF
+	>sub/newFileA-foo &&
+	>sub/newFileB-foo &&
+	>sub/fileA &&
+	>sub/fileB &&
+	git add -u ":(exclude,attr:labelB)" &&
+	git diff --name-only --cached  >actual &&
+	git restore -S -W . && rm sub/new* &&
+	test_cmp expect actual
+'
+
+test_expect_success 'check that attr magic works for git add <path>' '
+	cat <<-\EOF >expect &&
+	fileA
+	fileB
+	sub/fileA
+	EOF
+	>fileA &&
+	>fileB &&
+	>sub/fileA &&
+	>sub/fileB &&
+	git add ":(exclude,attr:labelB)sub/*" &&
+	git diff --name-only --cached >actual &&
+	git restore -S -W . &&
+	test_cmp expect actual
+'
+
+test_expect_success 'check that attr magic works for git -add .' '
+	cat <<-\EOF >expect &&
+	sub/fileA
+	EOF
+	>fileA &&
+	>fileB &&
+	>sub/fileA &&
+	>sub/fileB &&
+	cd sub &&
+	git add . ":(exclude,attr:labelB)" &&
+	cd .. &&
+	git diff --name-only --cached >actual &&
+	git restore -S -W . &&
+	test_cmp expect actual
+'
+
+test_expect_success 'check that attr magic works for git add --pathspec-from-file' '
+	cat <<-\EOF >pathspec_file &&
+	:(exclude,attr:labelB)
+	EOF
+	cat <<-\EOF >expect &&
+	sub/newFileA-foo
+	EOF
+	>sub/newFileA-foo &&
+	>sub/newFileB-foo &&
+	git add --all --pathspec-from-file=pathspec_file &&
+	git diff --name-only --cached >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success 'abort on giving invalid label on the command line' '
@@ -245,12 +367,57 @@ test_expect_success 'check attribute list' '
 
 test_expect_success 'backslash cannot be the last character' '
 	test_must_fail git ls-files ":(attr:label=foo\\ labelA=bar)" 2>actual &&
-	test_i18ngrep "not allowed as last character in attr value" actual
+	test_grep "not allowed as last character in attr value" actual
 '
 
 test_expect_success 'backslash cannot be used as a value' '
 	test_must_fail git ls-files ":(attr:label=f\\\oo)" 2>actual &&
-	test_i18ngrep "for value matching" actual
+	test_grep "for value matching" actual
+'
+
+test_expect_success 'reading from .gitattributes in a subdirectory (1)' '
+	git ls-files ":(attr:label1)" >actual &&
+	test_write_lines "sub/fileSetLabel" >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'reading from .gitattributes in a subdirectory (2)' '
+	git ls-files ":(attr:label1)sub" >actual &&
+	test_write_lines "sub/fileSetLabel" >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'reading from .gitattributes in a subdirectory (3)' '
+	git ls-files ":(attr:label1)sub/" >actual &&
+	test_write_lines "sub/fileSetLabel" >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success POSIXPERM 'pathspec with builtin_objectmode attr can be used' '
+	>mode_exec_file_1 &&
+
+	git status -s ":(attr:builtin_objectmode=100644)mode_exec_*" >actual &&
+	echo ?? mode_exec_file_1 >expect &&
+	test_cmp expect actual &&
+
+	git add mode_exec_file_1 &&
+	chmod +x mode_exec_file_1 &&
+	git status -s ":(attr:builtin_objectmode=100755)mode_exec_*" >actual &&
+	echo AM mode_exec_file_1 >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success POSIXPERM 'builtin_objectmode attr can be excluded' '
+	>mode_1_regular &&
+	>mode_1_exec  &&
+	chmod +x mode_1_exec &&
+	git status -s ":(exclude,attr:builtin_objectmode=100644)" "mode_1_*" >actual &&
+	echo ?? mode_1_exec >expect &&
+	test_cmp expect actual &&
+
+	git status -s ":(exclude,attr:builtin_objectmode=100755)" "mode_1_*" >actual &&
+	echo ?? mode_1_regular >expect &&
+	test_cmp expect actual
 '
 
 test_done
diff --git a/t/t6136-pathspec-in-bare.sh b/t/t6136-pathspec-in-bare.sh
index b117251..2db37a6 100755
--- a/t/t6136-pathspec-in-bare.sh
+++ b/t/t6136-pathspec-in-bare.sh
@@ -2,6 +2,7 @@
 
 test_description='diagnosing out-of-scope pathspec'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup a bare and non-bare repository' '
@@ -14,11 +15,11 @@ test_expect_success 'log and ls-files in a bare repository' '
 		cd bare &&
 		test_must_fail git log -- .. >out 2>err &&
 		test_must_be_empty out &&
-		test_i18ngrep "outside repository" err &&
+		test_grep "outside repository" err &&
 
 		test_must_fail git ls-files -- .. >out 2>err &&
 		test_must_be_empty out &&
-		test_i18ngrep "outside repository" err
+		test_grep "outside repository" err
 	)
 '
 
@@ -27,11 +28,11 @@ test_expect_success 'log and ls-files in .git directory' '
 		cd .git &&
 		test_must_fail git log -- .. >out 2>err &&
 		test_must_be_empty out &&
-		test_i18ngrep "outside repository" err &&
+		test_grep "outside repository" err &&
 
 		test_must_fail git ls-files -- .. >out 2>err &&
 		test_must_be_empty out &&
-		test_i18ngrep "outside repository" err
+		test_grep "outside repository" err
 	)
 '
 
diff --git a/t/t6200-fmt-merge-msg.sh b/t/t6200-fmt-merge-msg.sh
index 7d54974..5a221f8 100755
--- a/t/t6200-fmt-merge-msg.sh
+++ b/t/t6200-fmt-merge-msg.sh
@@ -5,6 +5,9 @@
 
 test_description='fmt-merge-msg test'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 . "$TEST_DIRECTORY/lib-gpg.sh"
 
@@ -78,10 +81,40 @@ test_expect_success GPG 'set up a signed tag' '
 	git tag -s -m signed-tag-msg signed-good-tag left
 '
 
+test_expect_success GPGSSH 'created ssh signed commit and tag' '
+	test_config gpg.format ssh &&
+	git checkout -b signed-ssh &&
+	touch file &&
+	git add file &&
+	git commit -m "ssh signed" -S"${GPGSSH_KEY_PRIMARY}" &&
+	git tag -s -u"${GPGSSH_KEY_PRIMARY}" -m signed-ssh-tag-msg signed-good-ssh-tag left &&
+	git tag -s -u"${GPGSSH_KEY_UNTRUSTED}" -m signed-ssh-tag-msg-untrusted signed-untrusted-ssh-tag left
+'
+
+test_expect_success GPGSSH,GPGSSH_VERIFYTIME 'create signed tags with keys having defined lifetimes' '
+	test_when_finished "test_unconfig commit.gpgsign" &&
+	test_config gpg.format ssh &&
+	git checkout -b signed-expiry-ssh &&
+	touch file &&
+	git add file &&
+
+	echo expired >file && test_tick && git commit -a -m expired -S"${GPGSSH_KEY_EXPIRED}" &&
+	git tag -s -u "${GPGSSH_KEY_EXPIRED}" -m expired-signed expired-signed &&
+
+	echo notyetvalid >file && test_tick && git commit -a -m notyetvalid -S"${GPGSSH_KEY_NOTYETVALID}" &&
+	git tag -s -u "${GPGSSH_KEY_NOTYETVALID}" -m notyetvalid-signed notyetvalid-signed &&
+
+	echo timeboxedvalid >file && test_tick && git commit -a -m timeboxedvalid -S"${GPGSSH_KEY_TIMEBOXEDVALID}" &&
+	git tag -s -u "${GPGSSH_KEY_TIMEBOXEDVALID}" -m timeboxedvalid-signed timeboxedvalid-signed &&
+
+	echo timeboxedinvalid >file && test_tick && git commit -a -m timeboxedinvalid -S"${GPGSSH_KEY_TIMEBOXEDINVALID}" &&
+	git tag -s -u "${GPGSSH_KEY_TIMEBOXEDINVALID}" -m timeboxedinvalid-signed timeboxedinvalid-signed
+'
+
 test_expect_success 'message for merging local branch' '
 	echo "Merge branch ${apos}left${apos}" >expected &&
 
-	git checkout master &&
+	git checkout main &&
 	git fetch . left &&
 
 	git fmt-merge-msg <.git/FETCH_HEAD >actual &&
@@ -89,27 +122,93 @@ test_expect_success 'message for merging local branch' '
 '
 
 test_expect_success GPG 'message for merging local tag signed by good key' '
-	git checkout master &&
+	git checkout main &&
 	git fetch . signed-good-tag &&
-	git fmt-merge-msg <.git/FETCH_HEAD >actual 2>&1 &&
+	git fmt-merge-msg <.git/FETCH_HEAD >actual &&
 	grep "^Merge tag ${apos}signed-good-tag${apos}" actual &&
+	grep "^signed-tag-msg" actual &&
 	grep "^# gpg: Signature made" actual &&
 	grep "^# gpg: Good signature from" actual
 '
 
 test_expect_success GPG 'message for merging local tag signed by unknown key' '
-	git checkout master &&
+	git checkout main &&
 	git fetch . signed-good-tag &&
-	GNUPGHOME=. git fmt-merge-msg <.git/FETCH_HEAD >actual 2>&1 &&
+	GNUPGHOME=. git fmt-merge-msg <.git/FETCH_HEAD >actual &&
 	grep "^Merge tag ${apos}signed-good-tag${apos}" actual &&
+	grep "^signed-tag-msg" actual &&
 	grep "^# gpg: Signature made" actual &&
 	grep -E "^# gpg: Can${apos}t check signature: (public key not found|No public key)" actual
 '
 
+test_expect_success GPGSSH 'message for merging local tag signed by good ssh key' '
+	test_config gpg.ssh.allowedSignersFile "${GPGSSH_ALLOWED_SIGNERS}" &&
+	git checkout main &&
+	git fetch . signed-good-ssh-tag &&
+	git fmt-merge-msg <.git/FETCH_HEAD >actual &&
+	grep "^Merge tag ${apos}signed-good-ssh-tag${apos}" actual &&
+	grep "^signed-ssh-tag-msg" actual &&
+	grep "${GPGSSH_GOOD_SIGNATURE_TRUSTED}" actual &&
+	! grep "${GPGSSH_BAD_SIGNATURE}" actual
+'
+
+test_expect_success GPGSSH 'message for merging local tag signed by unknown ssh key' '
+	test_config gpg.ssh.allowedSignersFile "${GPGSSH_ALLOWED_SIGNERS}" &&
+	git checkout main &&
+	git fetch . signed-untrusted-ssh-tag &&
+	git fmt-merge-msg <.git/FETCH_HEAD >actual &&
+	grep "^Merge tag ${apos}signed-untrusted-ssh-tag${apos}" actual &&
+	grep "^signed-ssh-tag-msg-untrusted" actual &&
+	grep "${GPGSSH_GOOD_SIGNATURE_UNTRUSTED}" actual &&
+	! grep "${GPGSSH_BAD_SIGNATURE}" actual &&
+	grep "${GPGSSH_KEY_NOT_TRUSTED}" actual
+'
+
+test_expect_success GPGSSH,GPGSSH_VERIFYTIME 'message for merging local tag signed by expired ssh key' '
+	test_config gpg.ssh.allowedSignersFile "${GPGSSH_ALLOWED_SIGNERS}" &&
+	git checkout main &&
+	git fetch . expired-signed &&
+	git fmt-merge-msg <.git/FETCH_HEAD >actual &&
+	grep "^Merge tag ${apos}expired-signed${apos}" actual &&
+	grep "^expired-signed" actual &&
+	! grep "${GPGSSH_GOOD_SIGNATURE_TRUSTED}" actual
+'
+
+test_expect_success GPGSSH,GPGSSH_VERIFYTIME 'message for merging local tag signed by not yet valid ssh key' '
+	test_config gpg.ssh.allowedSignersFile "${GPGSSH_ALLOWED_SIGNERS}" &&
+	git checkout main &&
+	git fetch . notyetvalid-signed &&
+	git fmt-merge-msg <.git/FETCH_HEAD >actual &&
+	grep "^Merge tag ${apos}notyetvalid-signed${apos}" actual &&
+	grep "^notyetvalid-signed" actual &&
+	! grep "${GPGSSH_GOOD_SIGNATURE_TRUSTED}" actual
+'
+
+test_expect_success GPGSSH,GPGSSH_VERIFYTIME 'message for merging local tag signed by valid timeboxed ssh key' '
+	test_config gpg.ssh.allowedSignersFile "${GPGSSH_ALLOWED_SIGNERS}" &&
+	git checkout main &&
+	git fetch . timeboxedvalid-signed &&
+	git fmt-merge-msg <.git/FETCH_HEAD >actual &&
+	grep "^Merge tag ${apos}timeboxedvalid-signed${apos}" actual &&
+	grep "^timeboxedvalid-signed" actual &&
+	grep "${GPGSSH_GOOD_SIGNATURE_TRUSTED}" actual &&
+	! grep "${GPGSSH_BAD_SIGNATURE}" actual
+'
+
+test_expect_success GPGSSH,GPGSSH_VERIFYTIME 'message for merging local tag signed by invalid timeboxed ssh key' '
+	test_config gpg.ssh.allowedSignersFile "${GPGSSH_ALLOWED_SIGNERS}" &&
+	git checkout main &&
+	git fetch . timeboxedinvalid-signed &&
+	git fmt-merge-msg <.git/FETCH_HEAD >actual &&
+	grep "^Merge tag ${apos}timeboxedinvalid-signed${apos}" actual &&
+	grep "^timeboxedinvalid-signed" actual &&
+	! grep "${GPGSSH_GOOD_SIGNATURE_TRUSTED}" actual
+'
+
 test_expect_success 'message for merging external branch' '
 	echo "Merge branch ${apos}left${apos} of $(pwd)" >expected &&
 
-	git checkout master &&
+	git checkout main &&
 	git fetch "$(pwd)" left &&
 
 	git fmt-merge-msg <.git/FETCH_HEAD >actual &&
@@ -133,7 +232,7 @@ test_expect_success '[merge] summary/log configuration' '
 	test_config merge.log true &&
 	test_unconfig merge.summary &&
 
-	git checkout master &&
+	git checkout main &&
 	test_tick &&
 	git fetch . left &&
 
@@ -142,7 +241,7 @@ test_expect_success '[merge] summary/log configuration' '
 	test_unconfig merge.log &&
 	test_config merge.summary true &&
 
-	git checkout master &&
+	git checkout main &&
 	test_tick &&
 	git fetch . left &&
 
@@ -153,7 +252,7 @@ test_expect_success '[merge] summary/log configuration' '
 '
 
 test_expect_success 'setup FETCH_HEAD' '
-	git checkout master &&
+	git checkout main &&
 	test_tick &&
 	git fetch . left
 '
@@ -281,7 +380,7 @@ test_expect_success 'fmt-merge-msg -m' '
 
 	test_unconfig merge.log &&
 	test_unconfig merge.summary &&
-	git checkout master &&
+	git checkout main &&
 	git fetch "$(pwd)" left &&
 	git fmt-merge-msg -m "Sync with left" <.git/FETCH_HEAD >actual &&
 	git fmt-merge-msg --log -m "Sync with left" \
@@ -323,28 +422,28 @@ test_expect_success 'setup: expected shortlog for two branches' '
 test_expect_success 'shortlog for two branches' '
 	test_config merge.log true &&
 	test_unconfig merge.summary &&
-	git checkout master &&
+	git checkout main &&
 	test_tick &&
 	git fetch . left right &&
 	git fmt-merge-msg <.git/FETCH_HEAD >actual1 &&
 
 	test_unconfig merge.log &&
 	test_config merge.summary true &&
-	git checkout master &&
+	git checkout main &&
 	test_tick &&
 	git fetch . left right &&
 	git fmt-merge-msg <.git/FETCH_HEAD >actual2 &&
 
 	test_config merge.log yes &&
 	test_unconfig merge.summary &&
-	git checkout master &&
+	git checkout main &&
 	test_tick &&
 	git fetch . left right &&
 	git fmt-merge-msg <.git/FETCH_HEAD >actual3 &&
 
 	test_unconfig merge.log &&
 	test_config merge.summary yes &&
-	git checkout master &&
+	git checkout main &&
 	test_tick &&
 	git fetch . left right &&
 	git fmt-merge-msg <.git/FETCH_HEAD >actual4 &&
@@ -358,7 +457,7 @@ test_expect_success 'shortlog for two branches' '
 test_expect_success 'merge-msg -F' '
 	test_unconfig merge.log &&
 	test_config merge.summary yes &&
-	git checkout master &&
+	git checkout main &&
 	test_tick &&
 	git fetch . left right &&
 	git fmt-merge-msg -F .git/FETCH_HEAD >actual &&
@@ -368,7 +467,7 @@ test_expect_success 'merge-msg -F' '
 test_expect_success 'merge-msg -F in subdirectory' '
 	test_unconfig merge.log &&
 	test_config merge.summary yes &&
-	git checkout master &&
+	git checkout main &&
 	test_tick &&
 	git fetch . left right &&
 	mkdir sub &&
@@ -408,7 +507,7 @@ test_expect_success 'merge-msg tag' '
 	test_unconfig merge.log &&
 	test_config merge.summary yes &&
 
-	git checkout master &&
+	git checkout main &&
 	test_tick &&
 	git fetch . tag tag-r3 &&
 
@@ -438,7 +537,7 @@ test_expect_success 'merge-msg two tags' '
 	test_unconfig merge.log &&
 	test_config merge.summary yes &&
 
-	git checkout master &&
+	git checkout main &&
 	test_tick &&
 	git fetch . tag tag-r3 tag tag-l5 &&
 
@@ -468,7 +567,7 @@ test_expect_success 'merge-msg tag and branch' '
 	test_unconfig merge.log &&
 	test_config merge.summary yes &&
 
-	git checkout master &&
+	git checkout main &&
 	test_tick &&
 	git fetch . tag tag-r3 left &&
 
@@ -488,14 +587,14 @@ test_expect_success 'merge-msg lots of commits' '
 		while test $i -gt 9
 		do
 			echo "  $i" &&
-			i=$(($i-1))
+			i=$(($i-1)) || return 1
 		done &&
 		echo "  ..."
 	} >expected &&
 
 	test_config merge.summary yes &&
 
-	git checkout master &&
+	git checkout main &&
 	test_tick &&
 	git fetch . long &&
 
@@ -506,11 +605,11 @@ test_expect_success 'merge-msg lots of commits' '
 test_expect_success 'merge-msg with "merging" an annotated tag' '
 	test_config merge.log true &&
 
-	git checkout master^0 &&
+	git checkout main^0 &&
 	git commit --allow-empty -m "One step ahead" &&
 	git tag -a -m "An annotated one" annote HEAD &&
 
-	git checkout master &&
+	git checkout main &&
 	git fetch . annote &&
 
 	git fmt-merge-msg <.git/FETCH_HEAD >actual &&
@@ -542,24 +641,64 @@ test_expect_success 'merge-msg with "merging" an annotated tag' '
 	test_cmp expected .git/MERGE_MSG
 '
 
+test_expect_success 'merge --into-name=<name>' '
+	test_when_finished "git checkout main" &&
+	git checkout -B side main &&
+	git commit --allow-empty -m "One step ahead" &&
+
+	git checkout --detach main &&
+	git merge --no-ff side &&
+	git show -s --format="%s" >full.0 &&
+	head -n1 full.0 >actual &&
+	# expect that HEAD is shown as-is
+	grep -e "Merge branch .side. into HEAD$" actual &&
+
+	git reset --hard main &&
+	git merge --no-ff --into-name=main side &&
+	git show -s --format="%s" >full.1 &&
+	head -n1 full.1 >actual &&
+	# expect that we pretend to be merging to main, that is suppressed
+	grep -e "Merge branch .side.$" actual &&
+
+	git checkout -b throwaway main &&
+	git merge --no-ff --into-name=main side &&
+	git show -s --format="%s" >full.2 &&
+	head -n1 full.2 >actual &&
+	# expect that we pretend to be merging to main, that is suppressed
+	grep -e "Merge branch .side.$" actual
+'
+
 test_expect_success 'merge.suppressDest configuration' '
-	git checkout -B side master &&
+	test_when_finished "git checkout main" &&
+	git checkout -B side main &&
 	git commit --allow-empty -m "One step ahead" &&
-	git checkout master &&
+	git checkout main &&
 	git fetch . side &&
 
 	git -c merge.suppressDest="" fmt-merge-msg <.git/FETCH_HEAD >full.1 &&
 	head -n1 full.1 >actual &&
-	grep -e "Merge branch .side. into master" actual &&
+	grep -e "Merge branch .side. into main" actual &&
 
 	git -c merge.suppressDest="mast" fmt-merge-msg <.git/FETCH_HEAD >full.2 &&
 	head -n1 full.2 >actual &&
-	grep -e "Merge branch .side. into master$" actual &&
+	grep -e "Merge branch .side. into main$" actual &&
 
-	git -c merge.suppressDest="ma??er" fmt-merge-msg <.git/FETCH_HEAD >full.3 &&
+	git -c merge.suppressDest="ma?*[rn]" fmt-merge-msg <.git/FETCH_HEAD >full.3 &&
 	head -n1 full.3 >actual &&
 	grep -e "Merge branch .side." actual &&
-	! grep -e " into master$" actual
+	! grep -e " into main$" actual &&
+
+	git checkout --detach HEAD &&
+	git -c merge.suppressDest="main" fmt-merge-msg <.git/FETCH_HEAD >full.4 &&
+	head -n1 full.4 >actual &&
+	grep -e "Merge branch .side. into HEAD$" actual &&
+
+	git -c merge.suppressDest="main" fmt-merge-msg \
+		--into-name=main <.git/FETCH_HEAD >full.5 &&
+	head -n1 full.5 >actual &&
+	grep -e "Merge branch .side." actual &&
+	! grep -e " into main$" actual &&
+	! grep -e " into HEAD$" actual
 '
 
 test_done
diff --git a/t/t6300-for-each-ref.sh b/t/t6300-for-each-ref.sh
index a83579f..eb6c820 100755
--- a/t/t6300-for-each-ref.sh
+++ b/t/t6300-for-each-ref.sh
@@ -6,6 +6,7 @@
 test_description='for-each-ref test'
 
 . ./test-lib.sh
+GNUPGHOME_NOT_USED=$GNUPGHOME
 . "$TEST_DIRECTORY"/lib-gpg.sh
 . "$TEST_DIRECTORY"/lib-terminal.sh
 
@@ -19,54 +20,74 @@ setdate_and_increment () {
     export GIT_COMMITTER_DATE GIT_AUTHOR_DATE
 }
 
+test_object_file_size () {
+	oid=$(git rev-parse "$1")
+	path=".git/objects/$(test_oid_to_path $oid)"
+	test_file_size "$path"
+}
+
 test_expect_success setup '
-	test_oid_cache <<-EOF &&
-	disklen sha1:138
-	disklen sha256:154
+	# setup .mailmap
+	cat >.mailmap <<-EOF &&
+	A Thor <athor@example.com> A U Thor <author@example.com>
+	C Mitter <cmitter@example.com> C O Mitter <committer@example.com>
 	EOF
+
 	setdate_and_increment &&
 	echo "Using $datestamp" > one &&
 	git add one &&
 	git commit -m "Initial" &&
+	git branch -M main &&
 	setdate_and_increment &&
 	git tag -a -m "Tagging at $datestamp" testtag &&
-	git update-ref refs/remotes/origin/master master &&
+	git update-ref refs/remotes/origin/main main &&
 	git remote add origin nowhere &&
-	git config branch.master.remote origin &&
-	git config branch.master.merge refs/heads/master &&
+	git config branch.main.remote origin &&
+	git config branch.main.merge refs/heads/main &&
 	git remote add myfork elsewhere &&
 	git config remote.pushdefault myfork &&
 	git config push.default current
 '
 
-test_atom() {
+test_atom () {
 	case "$1" in
-		head) ref=refs/heads/master ;;
+		head) ref=refs/heads/main ;;
 		 tag) ref=refs/tags/testtag ;;
 		 sym) ref=refs/heads/sym ;;
 		   *) ref=$1 ;;
 	esac
+	format=$2
+	test_do=test_expect_${4:-success}
+
 	printf '%s\n' "$3" >expected
-	test_expect_${4:-success} $PREREQ "basic atom: $1 $2" "
-		git for-each-ref --format='%($2)' $ref >actual &&
+	$test_do $PREREQ "basic atom: $ref $format" '
+		git for-each-ref --format="%($format)" "$ref" >actual &&
 		sanitize_pgp <actual >actual.clean &&
 		test_cmp expected actual.clean
-	"
+	'
+
 	# Automatically test "contents:size" atom after testing "contents"
-	if test "$2" = "contents"
+	if test "$format" = "contents"
 	then
-		case $(git cat-file -t "$ref") in
-		tag)
-			# We cannot use $3 as it expects sanitize_pgp to run
-			expect=$(git cat-file tag $ref | tail -n +6 | wc -c) ;;
-		tree | blob)
-			expect='' ;;
-		commit)
-			expect=$(printf '%s' "$3" | wc -c) ;;
-		esac
-		# Leave $expect unquoted to lose possible leading whitespaces
-		echo $expect >expected
-		test_expect_${4:-success} $PREREQ "basic atom: $1 contents:size" '
+		# for commit leg, $3 is changed there
+		expect=$(printf '%s' "$3" | wc -c)
+		$test_do $PREREQ "basic atom: $ref contents:size" '
+			type=$(git cat-file -t "$ref") &&
+			case $type in
+			tag)
+				# We cannot use $3 as it expects sanitize_pgp to run
+				git cat-file tag $ref >out &&
+				expect=$(tail -n +6 out | wc -c) &&
+				rm -f out ;;
+			tree | blob)
+				expect="" ;;
+			commit)
+				: "use the calculated expect" ;;
+			*)
+				BUG "unknown object type" ;;
+			esac &&
+			# Leave $expect unquoted to lose possible leading whitespaces
+			echo $expect >expected &&
 			git for-each-ref --format="%(contents:size)" "$ref" >actual &&
 			test_cmp expected actual
 		'
@@ -74,70 +95,100 @@ test_atom() {
 }
 
 hexlen=$(test_oid hexsz)
-disklen=$(test_oid disklen)
-
-test_atom head refname refs/heads/master
-test_atom head refname: refs/heads/master
-test_atom head refname:short master
-test_atom head refname:lstrip=1 heads/master
-test_atom head refname:lstrip=2 master
-test_atom head refname:lstrip=-1 master
-test_atom head refname:lstrip=-2 heads/master
+
+test_atom head refname refs/heads/main
+test_atom head refname: refs/heads/main
+test_atom head refname:short main
+test_atom head refname:lstrip=1 heads/main
+test_atom head refname:lstrip=2 main
+test_atom head refname:lstrip=-1 main
+test_atom head refname:lstrip=-2 heads/main
 test_atom head refname:rstrip=1 refs/heads
 test_atom head refname:rstrip=2 refs
 test_atom head refname:rstrip=-1 refs
 test_atom head refname:rstrip=-2 refs/heads
-test_atom head refname:strip=1 heads/master
-test_atom head refname:strip=2 master
-test_atom head refname:strip=-1 master
-test_atom head refname:strip=-2 heads/master
-test_atom head upstream refs/remotes/origin/master
-test_atom head upstream:short origin/master
-test_atom head upstream:lstrip=2 origin/master
-test_atom head upstream:lstrip=-2 origin/master
+test_atom head refname:strip=1 heads/main
+test_atom head refname:strip=2 main
+test_atom head refname:strip=-1 main
+test_atom head refname:strip=-2 heads/main
+test_atom head upstream refs/remotes/origin/main
+test_atom head upstream:short origin/main
+test_atom head upstream:lstrip=2 origin/main
+test_atom head upstream:lstrip=-2 origin/main
 test_atom head upstream:rstrip=2 refs/remotes
 test_atom head upstream:rstrip=-2 refs/remotes
-test_atom head upstream:strip=2 origin/master
-test_atom head upstream:strip=-2 origin/master
-test_atom head push refs/remotes/myfork/master
-test_atom head push:short myfork/master
-test_atom head push:lstrip=1 remotes/myfork/master
-test_atom head push:lstrip=-1 master
+test_atom head upstream:strip=2 origin/main
+test_atom head upstream:strip=-2 origin/main
+test_atom head push refs/remotes/myfork/main
+test_atom head push:short myfork/main
+test_atom head push:lstrip=1 remotes/myfork/main
+test_atom head push:lstrip=-1 main
 test_atom head push:rstrip=1 refs/remotes/myfork
 test_atom head push:rstrip=-1 refs
-test_atom head push:strip=1 remotes/myfork/master
-test_atom head push:strip=-1 master
+test_atom head push:strip=1 remotes/myfork/main
+test_atom head push:strip=-1 main
 test_atom head objecttype commit
 test_atom head objectsize $((131 + hexlen))
-test_atom head objectsize:disk $disklen
+test_atom head objectsize:disk $(test_object_file_size refs/heads/main)
 test_atom head deltabase $ZERO_OID
-test_atom head objectname $(git rev-parse refs/heads/master)
-test_atom head objectname:short $(git rev-parse --short refs/heads/master)
-test_atom head objectname:short=1 $(git rev-parse --short=1 refs/heads/master)
-test_atom head objectname:short=10 $(git rev-parse --short=10 refs/heads/master)
-test_atom head tree $(git rev-parse refs/heads/master^{tree})
+test_atom head objectname $(git rev-parse refs/heads/main)
+test_atom head objectname:short $(git rev-parse --short refs/heads/main)
+test_atom head objectname:short=1 $(git rev-parse --short=1 refs/heads/main)
+test_atom head objectname:short=10 $(git rev-parse --short=10 refs/heads/main)
+test_atom head tree $(git rev-parse refs/heads/main^{tree})
+test_atom head tree:short $(git rev-parse --short refs/heads/main^{tree})
+test_atom head tree:short=1 $(git rev-parse --short=1 refs/heads/main^{tree})
+test_atom head tree:short=10 $(git rev-parse --short=10 refs/heads/main^{tree})
 test_atom head parent ''
+test_atom head parent:short ''
+test_atom head parent:short=1 ''
+test_atom head parent:short=10 ''
 test_atom head numparent 0
 test_atom head object ''
 test_atom head type ''
+test_atom head raw "$(git cat-file commit refs/heads/main)
+"
 test_atom head '*objectname' ''
 test_atom head '*objecttype' ''
 test_atom head author 'A U Thor <author@example.com> 1151968724 +0200'
 test_atom head authorname 'A U Thor'
+test_atom head authorname:mailmap 'A Thor'
 test_atom head authoremail '<author@example.com>'
+test_atom head authoremail:trim 'author@example.com'
+test_atom head authoremail:localpart 'author'
+test_atom head authoremail:trim,localpart 'author'
+test_atom head authoremail:mailmap '<athor@example.com>'
+test_atom head authoremail:mailmap,trim 'athor@example.com'
+test_atom head authoremail:trim,mailmap 'athor@example.com'
+test_atom head authoremail:mailmap,localpart 'athor'
+test_atom head authoremail:localpart,mailmap 'athor'
+test_atom head authoremail:mailmap,trim,localpart,mailmap,trim 'athor'
 test_atom head authordate 'Tue Jul 4 01:18:44 2006 +0200'
 test_atom head committer 'C O Mitter <committer@example.com> 1151968723 +0200'
 test_atom head committername 'C O Mitter'
+test_atom head committername:mailmap 'C Mitter'
 test_atom head committeremail '<committer@example.com>'
+test_atom head committeremail:trim 'committer@example.com'
+test_atom head committeremail:localpart 'committer'
+test_atom head committeremail:localpart,trim 'committer'
+test_atom head committeremail:mailmap '<cmitter@example.com>'
+test_atom head committeremail:mailmap,trim 'cmitter@example.com'
+test_atom head committeremail:trim,mailmap 'cmitter@example.com'
+test_atom head committeremail:mailmap,localpart 'cmitter'
+test_atom head committeremail:localpart,mailmap 'cmitter'
+test_atom head committeremail:trim,mailmap,trim,trim,localpart 'cmitter'
 test_atom head committerdate 'Tue Jul 4 01:18:43 2006 +0200'
 test_atom head tag ''
 test_atom head tagger ''
 test_atom head taggername ''
 test_atom head taggeremail ''
+test_atom head taggeremail:trim ''
+test_atom head taggeremail:localpart ''
 test_atom head taggerdate ''
 test_atom head creator 'C O Mitter <committer@example.com> 1151968723 +0200'
 test_atom head creatordate 'Tue Jul 4 01:18:43 2006 +0200'
 test_atom head subject 'Initial'
+test_atom head subject:sanitize 'Initial'
 test_atom head contents:subject 'Initial'
 test_atom head body ''
 test_atom head contents:body ''
@@ -152,16 +203,22 @@ test_atom tag upstream ''
 test_atom tag push ''
 test_atom tag objecttype tag
 test_atom tag objectsize $((114 + hexlen))
-test_atom tag objectsize:disk $disklen
-test_atom tag '*objectsize:disk' $disklen
+test_atom tag objectsize:disk $(test_object_file_size refs/tags/testtag)
+test_atom tag '*objectsize:disk' $(test_object_file_size refs/heads/main)
 test_atom tag deltabase $ZERO_OID
 test_atom tag '*deltabase' $ZERO_OID
 test_atom tag objectname $(git rev-parse refs/tags/testtag)
 test_atom tag objectname:short $(git rev-parse --short refs/tags/testtag)
-test_atom head objectname:short=1 $(git rev-parse --short=1 refs/heads/master)
-test_atom head objectname:short=10 $(git rev-parse --short=10 refs/heads/master)
+test_atom head objectname:short=1 $(git rev-parse --short=1 refs/heads/main)
+test_atom head objectname:short=10 $(git rev-parse --short=10 refs/heads/main)
 test_atom tag tree ''
+test_atom tag tree:short ''
+test_atom tag tree:short=1 ''
+test_atom tag tree:short=10 ''
 test_atom tag parent ''
+test_atom tag parent:short ''
+test_atom tag parent:short=1 ''
+test_atom tag parent:short=10 ''
 test_atom tag numparent ''
 test_atom tag object $(git rev-parse refs/tags/testtag^0)
 test_atom tag type 'commit'
@@ -169,20 +226,51 @@ test_atom tag '*objectname' $(git rev-parse refs/tags/testtag^{})
 test_atom tag '*objecttype' 'commit'
 test_atom tag author ''
 test_atom tag authorname ''
+test_atom tag authorname:mailmap ''
 test_atom tag authoremail ''
+test_atom tag authoremail:trim ''
+test_atom tag authoremail:localpart ''
+test_atom tag authoremail:trim,localpart ''
+test_atom tag authoremail:mailmap ''
+test_atom tag authoremail:mailmap,trim ''
+test_atom tag authoremail:trim,mailmap ''
+test_atom tag authoremail:mailmap,localpart ''
+test_atom tag authoremail:localpart,mailmap ''
+test_atom tag authoremail:mailmap,trim,localpart,mailmap,trim ''
 test_atom tag authordate ''
 test_atom tag committer ''
 test_atom tag committername ''
+test_atom tag committername:mailmap ''
 test_atom tag committeremail ''
+test_atom tag committeremail:trim ''
+test_atom tag committeremail:localpart ''
+test_atom tag committeremail:localpart,trim ''
+test_atom tag committeremail:mailmap ''
+test_atom tag committeremail:mailmap,trim ''
+test_atom tag committeremail:trim,mailmap ''
+test_atom tag committeremail:mailmap,localpart ''
+test_atom tag committeremail:localpart,mailmap ''
+test_atom tag committeremail:trim,mailmap,trim,trim,localpart ''
 test_atom tag committerdate ''
 test_atom tag tag 'testtag'
 test_atom tag tagger 'C O Mitter <committer@example.com> 1151968725 +0200'
 test_atom tag taggername 'C O Mitter'
+test_atom tag taggername:mailmap 'C Mitter'
 test_atom tag taggeremail '<committer@example.com>'
+test_atom tag taggeremail:trim 'committer@example.com'
+test_atom tag taggeremail:localpart 'committer'
+test_atom tag taggeremail:trim,localpart 'committer'
+test_atom tag taggeremail:mailmap '<cmitter@example.com>'
+test_atom tag taggeremail:mailmap,trim 'cmitter@example.com'
+test_atom tag taggeremail:trim,mailmap 'cmitter@example.com'
+test_atom tag taggeremail:mailmap,localpart 'cmitter'
+test_atom tag taggeremail:localpart,mailmap 'cmitter'
+test_atom tag taggeremail:trim,mailmap,trim,localpart,localpart 'cmitter'
 test_atom tag taggerdate 'Tue Jul 4 01:18:45 2006 +0200'
 test_atom tag creator 'C O Mitter <committer@example.com> 1151968725 +0200'
 test_atom tag creatordate 'Tue Jul 4 01:18:45 2006 +0200'
 test_atom tag subject 'Tagging at 1151968727'
+test_atom tag subject:sanitize 'Tagging-at-1151968727'
 test_atom tag contents:subject 'Tagging at 1151968727'
 test_atom tag body ''
 test_atom tag contents:body ''
@@ -191,6 +279,15 @@ test_atom tag contents 'Tagging at 1151968727
 '
 test_atom tag HEAD ' '
 
+test_expect_success 'basic atom: refs/tags/testtag *raw' '
+	git cat-file commit refs/tags/testtag^{} >expected &&
+	git for-each-ref --format="%(*raw)" refs/tags/testtag >actual &&
+	sanitize_pgp <expected >expected.clean &&
+	echo >>expected.clean &&
+	sanitize_pgp <actual >actual.clean &&
+	test_cmp expected.clean actual.clean
+'
+
 test_expect_success 'Check invalid atoms names are errors' '
 	test_must_fail git for-each-ref --format="%(INVALID)" refs/heads
 '
@@ -221,13 +318,73 @@ test_expect_success 'arguments to %(objectname:short=) must be positive integers
 	test_must_fail git for-each-ref --format="%(objectname:short=foo)"
 '
 
+test_bad_atom () {
+	case "$1" in
+	head) ref=refs/heads/main ;;
+	 tag) ref=refs/tags/testtag ;;
+	 sym) ref=refs/heads/sym ;;
+	   *) ref=$1 ;;
+	esac
+	format=$2
+	test_do=test_expect_${4:-success}
+
+	printf '%s\n' "$3" >expect
+	$test_do $PREREQ "err basic atom: $ref $format" '
+		test_must_fail git for-each-ref \
+			--format="%($format)" "$ref" 2>error &&
+		test_cmp expect error
+	'
+}
+
+test_bad_atom head 'authoremail:foo' \
+	'fatal: unrecognized %(authoremail) argument: foo'
+
+test_bad_atom head 'authoremail:mailmap,trim,bar' \
+	'fatal: unrecognized %(authoremail) argument: bar'
+
+test_bad_atom head 'authoremail:trim,' \
+	'fatal: unrecognized %(authoremail) argument: '
+
+test_bad_atom head 'authoremail:mailmaptrim' \
+	'fatal: unrecognized %(authoremail) argument: trim'
+
+test_bad_atom head 'committeremail: ' \
+	'fatal: unrecognized %(committeremail) argument:  '
+
+test_bad_atom head 'committeremail: trim,foo' \
+	'fatal: unrecognized %(committeremail) argument:  trim,foo'
+
+test_bad_atom head 'committeremail:mailmap,localpart ' \
+	'fatal: unrecognized %(committeremail) argument:  '
+
+test_bad_atom head 'committeremail:trim_localpart' \
+	'fatal: unrecognized %(committeremail) argument: _localpart'
+
+test_bad_atom head 'committeremail:localpart,,,trim' \
+	'fatal: unrecognized %(committeremail) argument: ,,trim'
+
+test_bad_atom tag 'taggeremail:mailmap,trim, foo ' \
+	'fatal: unrecognized %(taggeremail) argument:  foo '
+
+test_bad_atom tag 'taggeremail:trim,localpart,' \
+	'fatal: unrecognized %(taggeremail) argument: '
+
+test_bad_atom tag 'taggeremail:mailmap;localpart trim' \
+	'fatal: unrecognized %(taggeremail) argument: ;localpart trim'
+
+test_bad_atom tag 'taggeremail:localpart trim' \
+	'fatal: unrecognized %(taggeremail) argument:  trim'
+
+test_bad_atom tag 'taggeremail:mailmap,mailmap,trim,qux,localpart,trim' \
+	'fatal: unrecognized %(taggeremail) argument: qux,localpart,trim'
+
 test_date () {
 	f=$1 &&
 	committer_date=$2 &&
 	author_date=$3 &&
 	tagger_date=$4 &&
 	cat >expected <<-EOF &&
-	'refs/heads/master' '$committer_date' '$author_date'
+	'refs/heads/main' '$committer_date' '$author_date'
 	'refs/tags/testtag' '$tagger_date'
 	EOF
 	(
@@ -349,8 +506,8 @@ test_expect_success 'exercise strftime with odd fields' '
 '
 
 cat >expected <<\EOF
-refs/heads/master
-refs/remotes/origin/master
+refs/heads/main
+refs/remotes/origin/main
 refs/tags/testtag
 EOF
 
@@ -362,8 +519,8 @@ test_expect_success 'Verify ascending sort' '
 
 cat >expected <<\EOF
 refs/tags/testtag
-refs/remotes/origin/master
-refs/heads/master
+refs/remotes/origin/main
+refs/heads/main
 EOF
 
 test_expect_success 'Verify descending sort' '
@@ -371,6 +528,11 @@ test_expect_success 'Verify descending sort' '
 	test_cmp expected actual
 '
 
+test_expect_success 'Give help even with invalid sort atoms' '
+	test_expect_code 129 git for-each-ref --sort=bogus -h >actual 2>&1 &&
+	grep "^usage: git for-each-ref" actual
+'
+
 cat >expected <<\EOF
 refs/tags/testtag
 refs/tags/testtag-2
@@ -398,8 +560,43 @@ test_expect_success 'exercise glob patterns with prefixes' '
 '
 
 cat >expected <<\EOF
-'refs/heads/master'
-'refs/remotes/origin/master'
+refs/tags/bar
+refs/tags/baz
+refs/tags/testtag
+EOF
+
+test_expect_success 'exercise patterns with prefix exclusions' '
+	for tag in foo/one foo/two foo/three bar baz
+	do
+		git tag "$tag" || return 1
+	done &&
+	test_when_finished "git tag -d foo/one foo/two foo/three bar baz" &&
+	git for-each-ref --format="%(refname)" \
+		refs/tags/ --exclude=refs/tags/foo >actual &&
+	test_cmp expected actual
+'
+
+cat >expected <<\EOF
+refs/tags/bar
+refs/tags/baz
+refs/tags/foo/one
+refs/tags/testtag
+EOF
+
+test_expect_success 'exercise patterns with pattern exclusions' '
+	for tag in foo/one foo/two foo/three bar baz
+	do
+		git tag "$tag" || return 1
+	done &&
+	test_when_finished "git tag -d foo/one foo/two foo/three bar baz" &&
+	git for-each-ref --format="%(refname)" \
+		refs/tags/ --exclude="refs/tags/foo/t*" >actual &&
+	test_cmp expected actual
+'
+
+cat >expected <<\EOF
+'refs/heads/main'
+'refs/remotes/origin/main'
 'refs/tags/testtag'
 EOF
 
@@ -419,8 +616,8 @@ test_expect_success 'Quoting style: python' '
 '
 
 cat >expected <<\EOF
-"refs/heads/master"
-"refs/remotes/origin/master"
+"refs/heads/main"
+"refs/remotes/origin/main"
 "refs/tags/testtag"
 EOF
 
@@ -447,8 +644,8 @@ test_atom head upstream:nobracket,track 'ahead 1'
 
 test_expect_success 'setup for push:track[short]' '
 	test_commit third &&
-	git update-ref refs/remotes/myfork/master master &&
-	git reset master~1
+	git update-ref refs/remotes/myfork/main main &&
+	git reset main~1
 '
 
 test_atom head push:track '[behind 1]'
@@ -464,8 +661,8 @@ test_expect_success 'Check that :track[short] works when upstream is invalid' '
 	[gone]
 
 	EOF
-	test_when_finished "git config branch.master.merge refs/heads/master" &&
-	git config branch.master.merge refs/heads/does-not-exist &&
+	test_when_finished "git config branch.main.merge refs/heads/main" &&
+	git config branch.main.merge refs/heads/does-not-exist &&
 	git for-each-ref \
 		--format="%(upstream:track)$LF%(upstream:trackshort)" \
 		refs/heads >actual &&
@@ -478,9 +675,9 @@ test_expect_success 'Check for invalid refname format' '
 
 test_expect_success 'set up color tests' '
 	cat >expected.color <<-EOF &&
-	$(git rev-parse --short refs/heads/master) <GREEN>master<RESET>
-	$(git rev-parse --short refs/remotes/myfork/master) <GREEN>myfork/master<RESET>
-	$(git rev-parse --short refs/remotes/origin/master) <GREEN>origin/master<RESET>
+	$(git rev-parse --short refs/heads/main) <GREEN>main<RESET>
+	$(git rev-parse --short refs/remotes/myfork/main) <GREEN>myfork/main<RESET>
+	$(git rev-parse --short refs/remotes/origin/main) <GREEN>origin/main<RESET>
 	$(git rev-parse --short refs/tags/testtag) <GREEN>testtag<RESET>
 	$(git rev-parse --short refs/tags/third) <GREEN>third<RESET>
 	$(git rev-parse --short refs/tags/two) <GREEN>two<RESET>
@@ -511,9 +708,147 @@ test_expect_success 'color.ui=always does not override tty check' '
 	test_cmp expected.bare actual
 '
 
+test_expect_success 'setup for describe atom tests' '
+	git init -b master describe-repo &&
+	(
+		cd describe-repo &&
+
+		test_commit --no-tag one &&
+		git tag tagone &&
+
+		test_commit --no-tag two &&
+		git tag -a -m "tag two" tagtwo
+	)
+'
+
+test_expect_success 'describe atom vs git describe' '
+	(
+		cd describe-repo &&
+
+		git for-each-ref --format="%(objectname)" \
+			refs/tags/ >obj &&
+		while read hash
+		do
+			if desc=$(git describe $hash)
+			then
+				: >expect-contains-good
+			else
+				: >expect-contains-bad
+			fi &&
+			echo "$hash $desc" || return 1
+		done <obj >expect &&
+		test_path_exists expect-contains-good &&
+		test_path_exists expect-contains-bad &&
+
+		git for-each-ref --format="%(objectname) %(describe)" \
+			refs/tags/ >actual 2>err &&
+		test_cmp expect actual &&
+		test_must_be_empty err
+	)
+'
+
+test_expect_success 'describe:tags vs describe --tags' '
+	(
+		cd describe-repo &&
+		git describe --tags >expect &&
+		git for-each-ref --format="%(describe:tags)" \
+				refs/heads/master >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'describe:abbrev=... vs describe --abbrev=...' '
+	(
+		cd describe-repo &&
+
+		# Case 1: We have commits between HEAD and the most
+		#	  recent tag reachable from it
+		test_commit --no-tag file &&
+		git describe --abbrev=14 >expect &&
+		git for-each-ref --format="%(describe:abbrev=14)" \
+			refs/heads/master >actual &&
+		test_cmp expect actual &&
+
+		# Make sure the hash used is atleast 14 digits long
+		sed -e "s/^.*-g\([0-9a-f]*\)$/\1/" <actual >hexpart &&
+		test 15 -le $(wc -c <hexpart) &&
+
+		# Case 2: We have a tag at HEAD, describe directly gives
+		#	  the name of the tag
+		git tag -a -m tagged tagname &&
+		git describe --abbrev=14 >expect &&
+		git for-each-ref --format="%(describe:abbrev=14)" \
+			refs/heads/master >actual &&
+		test_cmp expect actual &&
+		test tagname = $(cat actual)
+	)
+'
+
+test_expect_success 'describe:match=... vs describe --match ...' '
+	(
+		cd describe-repo &&
+		git tag -a -m "tag foo" tag-foo &&
+		git describe --match "*-foo" >expect &&
+		git for-each-ref --format="%(describe:match="*-foo")" \
+			refs/heads/master >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'describe:exclude:... vs describe --exclude ...' '
+	(
+		cd describe-repo &&
+		git tag -a -m "tag bar" tag-bar &&
+		git describe --exclude "*-bar" >expect &&
+		git for-each-ref --format="%(describe:exclude="*-bar")" \
+			refs/heads/master >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'deref with describe atom' '
+	(
+		cd describe-repo &&
+		cat >expect <<-\EOF &&
+
+		tagname
+		tagname
+		tagname
+
+		tagtwo
+		EOF
+		git for-each-ref --format="%(*describe)" >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'err on bad describe atom arg' '
+	(
+		cd describe-repo &&
+
+		# The bad arg is the only arg passed to describe atom
+		cat >expect <<-\EOF &&
+		fatal: unrecognized %(describe) argument: baz
+		EOF
+		test_must_fail git for-each-ref --format="%(describe:baz)" \
+			refs/heads/master 2>actual &&
+		test_cmp expect actual &&
+
+		# The bad arg is in the middle of the option string
+		# passed to the describe atom
+		cat >expect <<-\EOF &&
+		fatal: unrecognized %(describe) argument: qux=1,abbrev=14
+		EOF
+		test_must_fail git for-each-ref \
+			--format="%(describe:tags,qux=1,abbrev=14)" \
+			ref/heads/master 2>actual &&
+		test_cmp expect actual
+	)
+'
+
 cat >expected <<\EOF
-heads/master
-tags/master
+heads/main
+tags/main
 EOF
 
 test_expect_success 'Check ambiguous head and tag refs (strict)' '
@@ -523,19 +858,19 @@ test_expect_success 'Check ambiguous head and tag refs (strict)' '
 	git add one &&
 	git commit -m "Branch" &&
 	setdate_and_increment &&
-	git tag -m "Tagging at $datestamp" master &&
-	git for-each-ref --format "%(refname:short)" refs/heads/master refs/tags/master >actual &&
+	git tag -m "Tagging at $datestamp" main &&
+	git for-each-ref --format "%(refname:short)" refs/heads/main refs/tags/main >actual &&
 	test_cmp expected actual
 '
 
 cat >expected <<\EOF
-heads/master
-master
+heads/main
+main
 EOF
 
 test_expect_success 'Check ambiguous head and tag refs (loose)' '
 	git config --bool core.warnambiguousrefs false &&
-	git for-each-ref --format "%(refname:short)" refs/heads/master refs/tags/master >actual &&
+	git for-each-ref --format "%(refname:short)" refs/heads/main refs/tags/main >actual &&
 	test_cmp expected actual
 '
 
@@ -545,7 +880,7 @@ ambiguous
 EOF
 
 test_expect_success 'Check ambiguous head and tag refs II (loose)' '
-	git checkout master &&
+	git checkout main &&
 	git tag ambiguous testtag^0 &&
 	git branch ambiguous testtag^0 &&
 	git for-each-ref --format "%(refname:short)" refs/heads/ambiguous refs/tags/ambiguous >actual &&
@@ -556,7 +891,7 @@ test_expect_success 'create tag without tagger' '
 	git tag -a -m "Broken tag" taggerless &&
 	git tag -f taggerless $(git cat-file tag taggerless |
 		sed -e "/^tagger /d" |
-		git hash-object --stdin -w -t tag)
+		git hash-object --literally --stdin -w -t tag)
 '
 
 test_atom refs/tags/taggerless type 'commit'
@@ -564,10 +899,14 @@ test_atom refs/tags/taggerless tag 'taggerless'
 test_atom refs/tags/taggerless tagger ''
 test_atom refs/tags/taggerless taggername ''
 test_atom refs/tags/taggerless taggeremail ''
+test_atom refs/tags/taggerless taggeremail:trim ''
+test_atom refs/tags/taggerless taggeremail:localpart ''
 test_atom refs/tags/taggerless taggerdate ''
 test_atom refs/tags/taggerless committer ''
 test_atom refs/tags/taggerless committername ''
 test_atom refs/tags/taggerless committeremail ''
+test_atom refs/tags/taggerless committeremail:trim ''
+test_atom refs/tags/taggerless committeremail:localpart ''
 test_atom refs/tags/taggerless committerdate ''
 test_atom refs/tags/taggerless subject 'Broken tag'
 
@@ -591,6 +930,7 @@ test_expect_success 'create tag with subject and body content' '
 	git tag -F msg subject-body
 '
 test_atom refs/tags/subject-body subject 'the subject line'
+test_atom refs/tags/subject-body subject:sanitize 'the-subject-line'
 test_atom refs/tags/subject-body body 'first body line
 second body line
 '
@@ -611,6 +951,7 @@ test_expect_success 'create tag with multiline subject' '
 	git tag -F msg multiline
 '
 test_atom refs/tags/multiline subject 'first subject line second subject line'
+test_atom refs/tags/multiline subject:sanitize 'first-subject-line-second-subject-line'
 test_atom refs/tags/multiline contents:subject 'first subject line second subject line'
 test_atom refs/tags/multiline body 'first body line
 second body line
@@ -643,13 +984,24 @@ sig='-----BEGIN PGP SIGNATURE-----
 
 PREREQ=GPG
 test_atom refs/tags/signed-empty subject ''
+test_atom refs/tags/signed-empty subject:sanitize ''
 test_atom refs/tags/signed-empty contents:subject ''
 test_atom refs/tags/signed-empty body "$sig"
 test_atom refs/tags/signed-empty contents:body ''
 test_atom refs/tags/signed-empty contents:signature "$sig"
 test_atom refs/tags/signed-empty contents "$sig"
 
+test_expect_success GPG 'basic atom: refs/tags/signed-empty raw' '
+	git cat-file tag refs/tags/signed-empty >expected &&
+	git for-each-ref --format="%(raw)" refs/tags/signed-empty >actual &&
+	sanitize_pgp <expected >expected.clean &&
+	echo >>expected.clean &&
+	sanitize_pgp <actual >actual.clean &&
+	test_cmp expected.clean actual.clean
+'
+
 test_atom refs/tags/signed-short subject 'subject line'
+test_atom refs/tags/signed-short subject:sanitize 'subject-line'
 test_atom refs/tags/signed-short contents:subject 'subject line'
 test_atom refs/tags/signed-short body "$sig"
 test_atom refs/tags/signed-short contents:body ''
@@ -657,7 +1009,17 @@ test_atom refs/tags/signed-short contents:signature "$sig"
 test_atom refs/tags/signed-short contents "subject line
 $sig"
 
+test_expect_success GPG 'basic atom: refs/tags/signed-short raw' '
+	git cat-file tag refs/tags/signed-short >expected &&
+	git for-each-ref --format="%(raw)" refs/tags/signed-short >actual &&
+	sanitize_pgp <expected >expected.clean &&
+	echo >>expected.clean &&
+	sanitize_pgp <actual >actual.clean &&
+	test_cmp expected.clean actual.clean
+'
+
 test_atom refs/tags/signed-long subject 'subject line'
+test_atom refs/tags/signed-long subject:sanitize 'subject-line'
 test_atom refs/tags/signed-long contents:subject 'subject line'
 test_atom refs/tags/signed-long body "body contents
 $sig"
@@ -669,9 +1031,18 @@ test_atom refs/tags/signed-long contents "subject line
 body contents
 $sig"
 
+test_expect_success GPG 'basic atom: refs/tags/signed-long raw' '
+	git cat-file tag refs/tags/signed-long >expected &&
+	git for-each-ref --format="%(raw)" refs/tags/signed-long >actual &&
+	sanitize_pgp <expected >expected.clean &&
+	echo >>expected.clean &&
+	sanitize_pgp <actual >actual.clean &&
+	test_cmp expected.clean actual.clean
+'
+
 test_expect_success 'set up refs pointing to tree and blob' '
-	git update-ref refs/mytrees/first refs/heads/master^{tree} &&
-	git update-ref refs/myblobs/first refs/heads/master:one
+	git update-ref refs/mytrees/first refs/heads/main^{tree} &&
+	git update-ref refs/myblobs/first refs/heads/main:one
 '
 
 test_atom refs/mytrees/first subject ""
@@ -681,6 +1052,16 @@ test_atom refs/mytrees/first contents:body ""
 test_atom refs/mytrees/first contents:signature ""
 test_atom refs/mytrees/first contents ""
 
+test_expect_success 'basic atom: refs/mytrees/first raw' '
+	git cat-file tree refs/mytrees/first >expected &&
+	echo >>expected &&
+	git for-each-ref --format="%(raw)" refs/mytrees/first >actual &&
+	test_cmp expected actual &&
+	git cat-file -s refs/mytrees/first >expected &&
+	git for-each-ref --format="%(raw:size)" refs/mytrees/first >actual &&
+	test_cmp expected actual
+'
+
 test_atom refs/myblobs/first subject ""
 test_atom refs/myblobs/first contents:subject ""
 test_atom refs/myblobs/first body ""
@@ -688,6 +1069,197 @@ test_atom refs/myblobs/first contents:body ""
 test_atom refs/myblobs/first contents:signature ""
 test_atom refs/myblobs/first contents ""
 
+test_expect_success 'basic atom: refs/myblobs/first raw' '
+	git cat-file blob refs/myblobs/first >expected &&
+	echo >>expected &&
+	git for-each-ref --format="%(raw)" refs/myblobs/first >actual &&
+	test_cmp expected actual &&
+	git cat-file -s refs/myblobs/first >expected &&
+	git for-each-ref --format="%(raw:size)" refs/myblobs/first >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'set up refs pointing to binary blob' '
+	printf "a\0b\0c" >blob1 &&
+	printf "a\0c\0b" >blob2 &&
+	printf "\0a\0b\0c" >blob3 &&
+	printf "abc" >blob4 &&
+	printf "\0 \0 \0 " >blob5 &&
+	printf "\0 \0a\0 " >blob6 &&
+	printf "  " >blob7 &&
+	>blob8 &&
+	obj=$(git hash-object -w blob1) &&
+	git update-ref refs/myblobs/blob1 "$obj" &&
+	obj=$(git hash-object -w blob2) &&
+	git update-ref refs/myblobs/blob2 "$obj" &&
+	obj=$(git hash-object -w blob3) &&
+	git update-ref refs/myblobs/blob3 "$obj" &&
+	obj=$(git hash-object -w blob4) &&
+	git update-ref refs/myblobs/blob4 "$obj" &&
+	obj=$(git hash-object -w blob5) &&
+	git update-ref refs/myblobs/blob5 "$obj" &&
+	obj=$(git hash-object -w blob6) &&
+	git update-ref refs/myblobs/blob6 "$obj" &&
+	obj=$(git hash-object -w blob7) &&
+	git update-ref refs/myblobs/blob7 "$obj" &&
+	obj=$(git hash-object -w blob8) &&
+	git update-ref refs/myblobs/blob8 "$obj"
+'
+
+test_expect_success 'Verify sorts with raw' '
+	cat >expected <<-EOF &&
+	refs/myblobs/blob8
+	refs/myblobs/blob5
+	refs/myblobs/blob6
+	refs/myblobs/blob3
+	refs/myblobs/blob7
+	refs/mytrees/first
+	refs/myblobs/first
+	refs/myblobs/blob1
+	refs/myblobs/blob2
+	refs/myblobs/blob4
+	refs/heads/main
+	EOF
+	git for-each-ref --format="%(refname)" --sort=raw \
+		refs/heads/main refs/myblobs/ refs/mytrees/first >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'Verify sorts with raw:size' '
+	cat >expected <<-EOF &&
+	refs/myblobs/blob8
+	refs/myblobs/blob7
+	refs/myblobs/blob4
+	refs/myblobs/blob1
+	refs/myblobs/blob2
+	refs/myblobs/blob3
+	refs/myblobs/blob5
+	refs/myblobs/blob6
+	refs/myblobs/first
+	refs/mytrees/first
+	refs/heads/main
+	EOF
+	git for-each-ref --format="%(refname)" --sort=raw:size \
+		refs/heads/main refs/myblobs/ refs/mytrees/first >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'validate raw atom with %(if:equals)' '
+	cat >expected <<-EOF &&
+	not equals
+	not equals
+	not equals
+	not equals
+	not equals
+	not equals
+	refs/myblobs/blob4
+	not equals
+	not equals
+	not equals
+	not equals
+	not equals
+	EOF
+	git for-each-ref --format="%(if:equals=abc)%(raw)%(then)%(refname)%(else)not equals%(end)" \
+		refs/myblobs/ refs/heads/ >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'validate raw atom with %(if:notequals)' '
+	cat >expected <<-EOF &&
+	refs/heads/ambiguous
+	refs/heads/main
+	refs/heads/newtag
+	refs/myblobs/blob1
+	refs/myblobs/blob2
+	refs/myblobs/blob3
+	equals
+	refs/myblobs/blob5
+	refs/myblobs/blob6
+	refs/myblobs/blob7
+	refs/myblobs/blob8
+	refs/myblobs/first
+	EOF
+	git for-each-ref --format="%(if:notequals=abc)%(raw)%(then)%(refname)%(else)equals%(end)" \
+		refs/myblobs/ refs/heads/ >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'empty raw refs with %(if)' '
+	cat >expected <<-EOF &&
+	refs/myblobs/blob1 not empty
+	refs/myblobs/blob2 not empty
+	refs/myblobs/blob3 not empty
+	refs/myblobs/blob4 not empty
+	refs/myblobs/blob5 not empty
+	refs/myblobs/blob6 not empty
+	refs/myblobs/blob7 empty
+	refs/myblobs/blob8 empty
+	refs/myblobs/first not empty
+	EOF
+	git for-each-ref --format="%(refname) %(if)%(raw)%(then)not empty%(else)empty%(end)" \
+		refs/myblobs/ >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success '%(raw) with --python must fail' '
+	test_must_fail git for-each-ref --format="%(raw)" --python
+'
+
+test_expect_success '%(raw) with --tcl must fail' '
+	test_must_fail git for-each-ref --format="%(raw)" --tcl
+'
+
+test_expect_success '%(raw) with --perl' '
+	git for-each-ref --format="\$name= %(raw);
+print \"\$name\"" refs/myblobs/blob1 --perl | perl >actual &&
+	cmp blob1 actual &&
+	git for-each-ref --format="\$name= %(raw);
+print \"\$name\"" refs/myblobs/blob3 --perl | perl >actual &&
+	cmp blob3 actual &&
+	git for-each-ref --format="\$name= %(raw);
+print \"\$name\"" refs/myblobs/blob8 --perl | perl >actual &&
+	cmp blob8 actual &&
+	git for-each-ref --format="\$name= %(raw);
+print \"\$name\"" refs/myblobs/first --perl | perl >actual &&
+	cmp one actual &&
+	git cat-file tree refs/mytrees/first > expected &&
+	git for-each-ref --format="\$name= %(raw);
+print \"\$name\"" refs/mytrees/first --perl | perl >actual &&
+	cmp expected actual
+'
+
+test_expect_success '%(raw) with --shell must fail' '
+	test_must_fail git for-each-ref --format="%(raw)" --shell
+'
+
+test_expect_success '%(raw) with --shell and --sort=raw must fail' '
+	test_must_fail git for-each-ref --format="%(raw)" --sort=raw --shell
+'
+
+test_expect_success '%(raw:size) with --shell' '
+	git for-each-ref --format="%(raw:size)" | sed "s/^/$SQ/;s/$/$SQ/" >expect &&
+	git for-each-ref --format="%(raw:size)" --shell >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'for-each-ref --format compare with cat-file --batch' '
+	git rev-parse refs/mytrees/first | git cat-file --batch >expected &&
+	git for-each-ref --format="%(objectname) %(objecttype) %(objectsize)
+%(raw)" refs/mytrees/first >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'verify sorts with contents:size' '
+	cat >expect <<-\EOF &&
+	refs/heads/main
+	refs/heads/newtag
+	refs/heads/ambiguous
+	EOF
+	git for-each-ref --format="%(refname)" \
+		--sort=contents:size refs/heads/ >actual &&
+	test_cmp expect actual
+'
+
 test_expect_success 'set up multiple-sort tags' '
 	for when in 100000 200000
 	do
@@ -742,8 +1314,96 @@ test_expect_success 'equivalent sorts fall back on refname' '
 	test_cmp expected actual
 '
 
+test_expect_success '--no-sort cancels the previous sort keys' '
+	cat >expected <<-\EOF &&
+	100000 <user1@example.com> refs/tags/multi-ref1-100000-user1
+	100000 <user2@example.com> refs/tags/multi-ref1-100000-user2
+	100000 <user1@example.com> refs/tags/multi-ref2-100000-user1
+	100000 <user2@example.com> refs/tags/multi-ref2-100000-user2
+	200000 <user1@example.com> refs/tags/multi-ref1-200000-user1
+	200000 <user2@example.com> refs/tags/multi-ref1-200000-user2
+	200000 <user1@example.com> refs/tags/multi-ref2-200000-user1
+	200000 <user2@example.com> refs/tags/multi-ref2-200000-user2
+	EOF
+	git for-each-ref \
+		--format="%(taggerdate:unix) %(taggeremail) %(refname)" \
+		--sort=-refname \
+		--sort=taggeremail \
+		--no-sort \
+		--sort=taggerdate \
+		"refs/tags/multi-*" >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success '--no-sort without subsequent --sort prints expected refs' '
+	cat >expected <<-\EOF &&
+	refs/tags/multi-ref1-100000-user1
+	refs/tags/multi-ref1-100000-user2
+	refs/tags/multi-ref1-200000-user1
+	refs/tags/multi-ref1-200000-user2
+	refs/tags/multi-ref2-100000-user1
+	refs/tags/multi-ref2-100000-user2
+	refs/tags/multi-ref2-200000-user1
+	refs/tags/multi-ref2-200000-user2
+	EOF
+
+	# Sort the results with `sort` for a consistent comparison against
+	# expected
+	git for-each-ref \
+		--format="%(refname)" \
+		--no-sort \
+		"refs/tags/multi-*" | sort >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'set up custom date sorting' '
+	# Dates:
+	# - Wed Feb 07 2024 21:34:20 +0000
+	# - Tue Dec 14 1999 00:05:22 +0000
+	# - Fri Jun 04 2021 11:26:51 +0000
+	# - Mon Jan 22 2007 16:44:01 GMT+0000
+	i=1 &&
+	for when in 1707341660 945129922 1622806011 1169484241
+	do
+		GIT_COMMITTER_DATE="@$when +0000" \
+		GIT_COMMITTER_EMAIL="user@example.com" \
+		git tag -m "tag $when" custom-dates-$i &&
+		i=$(($i+1)) || return 1
+	done
+'
+
+test_expect_success 'sort by date defaults to full timestamp' '
+	cat >expected <<-\EOF &&
+	945129922 refs/tags/custom-dates-2
+	1169484241 refs/tags/custom-dates-4
+	1622806011 refs/tags/custom-dates-3
+	1707341660 refs/tags/custom-dates-1
+	EOF
+
+	git for-each-ref \
+		--format="%(creatordate:unix) %(refname)" \
+		--sort=creatordate \
+		"refs/tags/custom-dates-*" >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'sort by custom date format' '
+	cat >expected <<-\EOF &&
+	00:05:22 refs/tags/custom-dates-2
+	11:26:51 refs/tags/custom-dates-3
+	16:44:01 refs/tags/custom-dates-4
+	21:34:20 refs/tags/custom-dates-1
+	EOF
+
+	git for-each-ref \
+		--format="%(creatordate:format:%H:%M:%S) %(refname)" \
+		--sort="creatordate:format:%H:%M:%S" \
+		"refs/tags/custom-dates-*" >actual &&
+	test_cmp expected actual
+'
+
 test_expect_success 'do not dereference NULL upon %(HEAD) on unborn branch' '
-	test_when_finished "git checkout master" &&
+	test_when_finished "git checkout main" &&
 	git for-each-ref --format="%(HEAD) %(refname:short)" refs/heads/ >actual &&
 	sed -e "s/^\* /  /" actual >expect &&
 	git checkout --orphan orphaned-branch &&
@@ -775,84 +1435,163 @@ test_expect_success 'set up trailers for next test' '
 	EOF
 '
 
-test_expect_success '%(trailers:unfold) unfolds trailers' '
-	git for-each-ref --format="%(trailers:unfold)" refs/heads/master >actual &&
-	{
-		unfold <trailers
-		echo
-	} >expect &&
-	test_cmp expect actual
-'
+test_trailer_option () {
+	title=$1 option=$2
+	cat >expect
+	test_expect_success "$title" '
+		git for-each-ref --format="%($option)" refs/heads/main >actual &&
+		test_cmp expect actual &&
+		git for-each-ref --format="%(contents:$option)" refs/heads/main >actual &&
+		test_cmp expect actual
+	'
+}
 
-test_expect_success '%(trailers:only) shows only "key: value" trailers' '
-	git for-each-ref --format="%(trailers:only)" refs/heads/master >actual &&
-	{
-		grep -v patch.description <trailers &&
-		echo
-	} >expect &&
-	test_cmp expect actual
-'
+test_trailer_option '%(trailers:unfold) unfolds trailers' \
+	'trailers:unfold' <<-EOF
+	$(unfold <trailers)
 
-test_expect_success '%(trailers:only) and %(trailers:unfold) work together' '
-	git for-each-ref --format="%(trailers:only,unfold)" refs/heads/master >actual &&
-	git for-each-ref --format="%(trailers:unfold,only)" refs/heads/master >reverse &&
-	test_cmp actual reverse &&
-	{
-		grep -v patch.description <trailers | unfold &&
-		echo
-	} >expect &&
-	test_cmp expect actual
-'
+	EOF
 
-test_expect_success '%(contents:trailers:unfold) unfolds trailers' '
-	git for-each-ref --format="%(contents:trailers:unfold)" refs/heads/master >actual &&
-	{
-		unfold <trailers
-		echo
-	} >expect &&
-	test_cmp expect actual
-'
+test_trailer_option '%(trailers:only) shows only "key: value" trailers' \
+	'trailers:only' <<-EOF
+	$(grep -v patch.description <trailers)
 
-test_expect_success '%(contents:trailers:only) shows only "key: value" trailers' '
-	git for-each-ref --format="%(contents:trailers:only)" refs/heads/master >actual &&
-	{
-		grep -v patch.description <trailers &&
-		echo
-	} >expect &&
-	test_cmp expect actual
-'
+	EOF
 
-test_expect_success '%(contents:trailers:only) and %(contents:trailers:unfold) work together' '
-	git for-each-ref --format="%(contents:trailers:only,unfold)" refs/heads/master >actual &&
-	git for-each-ref --format="%(contents:trailers:unfold,only)" refs/heads/master >reverse &&
-	test_cmp actual reverse &&
-	{
-		grep -v patch.description <trailers | unfold &&
-		echo
-	} >expect &&
-	test_cmp expect actual
-'
+test_trailer_option '%(trailers:only=no,only=true) shows only "key: value" trailers' \
+	'trailers:only=no,only=true' <<-EOF
+	$(grep -v patch.description <trailers)
 
-test_expect_success '%(trailers) rejects unknown trailers arguments' '
-	# error message cannot be checked under i18n
-	cat >expect <<-EOF &&
+	EOF
+
+test_trailer_option '%(trailers:only=yes) shows only "key: value" trailers' \
+	'trailers:only=yes' <<-EOF
+	$(grep -v patch.description <trailers)
+
+	EOF
+
+test_trailer_option '%(trailers:only=no) shows all trailers' \
+	'trailers:only=no' <<-EOF
+	$(cat trailers)
+
+	EOF
+
+test_trailer_option '%(trailers:only) and %(trailers:unfold) work together' \
+	'trailers:only,unfold' <<-EOF
+	$(grep -v patch.description <trailers | unfold)
+
+	EOF
+
+test_trailer_option '%(trailers:unfold) and %(trailers:only) work together' \
+	'trailers:unfold,only' <<-EOF
+	$(grep -v patch.description <trailers | unfold)
+
+	EOF
+
+test_trailer_option '%(trailers:key=foo) shows that trailer' \
+	'trailers:key=Signed-off-by' <<-EOF
+	Signed-off-by: A U Thor <author@example.com>
+
+	EOF
+
+test_trailer_option '%(trailers:key=foo) is case insensitive' \
+	'trailers:key=SiGned-oFf-bY' <<-EOF
+	Signed-off-by: A U Thor <author@example.com>
+
+	EOF
+
+test_trailer_option '%(trailers:key=foo:) trailing colon also works' \
+	'trailers:key=Signed-off-by:' <<-EOF
+	Signed-off-by: A U Thor <author@example.com>
+
+	EOF
+
+test_trailer_option '%(trailers:key=foo) multiple keys' \
+	'trailers:key=Reviewed-by:,key=Signed-off-by' <<-EOF
+	Reviewed-by: A U Thor <author@example.com>
+	Signed-off-by: A U Thor <author@example.com>
+
+	EOF
+
+test_trailer_option '%(trailers:key=nonexistent) becomes empty' \
+	'trailers:key=Shined-off-by:' <<-EOF
+
+	EOF
+
+test_trailer_option '%(trailers:key=foo) handles multiple lines even if folded' \
+	'trailers:key=Acked-by' <<-EOF
+	$(grep -v patch.description <trailers | grep -v Signed-off-by | grep -v Reviewed-by)
+
+	EOF
+
+test_trailer_option '%(trailers:key=foo,unfold) properly unfolds' \
+	'trailers:key=Signed-Off-by,unfold' <<-EOF
+	$(unfold <trailers | grep Signed-off-by)
+
+	EOF
+
+test_trailer_option '%(trailers:key=foo,only=no) also includes nontrailer lines' \
+	'trailers:key=Signed-off-by,only=no' <<-EOF
+	Signed-off-by: A U Thor <author@example.com>
+	$(grep patch.description <trailers)
+
+	EOF
+
+test_trailer_option '%(trailers:key=foo,valueonly) shows only value' \
+	'trailers:key=Signed-off-by,valueonly' <<-EOF
+	A U Thor <author@example.com>
+
+	EOF
+
+test_trailer_option '%(trailers:separator) changes separator' \
+	'trailers:separator=%x2C,key=Reviewed-by,key=Signed-off-by:' <<-EOF
+	Reviewed-by: A U Thor <author@example.com>,Signed-off-by: A U Thor <author@example.com>
+	EOF
+
+test_trailer_option '%(trailers:key_value_separator) changes key-value separator' \
+	'trailers:key_value_separator=%x2C,key=Reviewed-by,key=Signed-off-by:' <<-EOF
+	Reviewed-by,A U Thor <author@example.com>
+	Signed-off-by,A U Thor <author@example.com>
+
+	EOF
+
+test_trailer_option '%(trailers:separator,key_value_separator) changes both separators' \
+	'trailers:separator=%x2C,key_value_separator=%x2C,key=Reviewed-by,key=Signed-off-by:' <<-EOF
+	Reviewed-by,A U Thor <author@example.com>,Signed-off-by,A U Thor <author@example.com>
+	EOF
+
+test_failing_trailer_option () {
+	title=$1 option=$2
+	cat >expect
+	test_expect_success "$title" '
+		# error message cannot be checked under i18n
+		test_must_fail git for-each-ref --format="%($option)" refs/heads/main 2>actual &&
+		test_cmp expect actual &&
+		test_must_fail git for-each-ref --format="%(contents:$option)" refs/heads/main 2>actual &&
+		test_cmp expect actual
+	'
+}
+
+test_failing_trailer_option '%(trailers) rejects unknown trailers arguments' \
+	'trailers:unsupported' <<-\EOF
 	fatal: unknown %(trailers) argument: unsupported
 	EOF
-	test_must_fail git for-each-ref --format="%(trailers:unsupported)" 2>actual &&
-	test_i18ncmp expect actual
-'
 
-test_expect_success '%(contents:trailers) rejects unknown trailers arguments' '
-	# error message cannot be checked under i18n
+test_failing_trailer_option '%(trailers:key) without value is error' \
+	'trailers:key' <<-\EOF
+	fatal: expected %(trailers:key=<value>)
+	EOF
+
+test_expect_success 'if arguments, %(contents:trailers) shows error if colon is missing' '
 	cat >expect <<-EOF &&
-	fatal: unknown %(trailers) argument: unsupported
+	fatal: unrecognized %(contents) argument: trailersonly
 	EOF
-	test_must_fail git for-each-ref --format="%(contents:trailers:unsupported)" 2>actual &&
-	test_i18ncmp expect actual
+	test_must_fail git for-each-ref --format="%(contents:trailersonly)" 2>actual &&
+	test_cmp expect actual
 '
 
 test_expect_success 'basic atom: head contents:trailers' '
-	git for-each-ref --format="%(contents:trailers)" refs/heads/master >actual &&
+	git for-each-ref --format="%(contents:trailers)" refs/heads/main >actual &&
 	sanitize_pgp <actual >actual.clean &&
 	# git for-each-ref ends with a blank line
 	cat >expect <<-EOF &&
@@ -862,6 +1601,28 @@ test_expect_success 'basic atom: head contents:trailers' '
 	test_cmp expect actual.clean
 '
 
+test_expect_success 'basic atom: rest must fail' '
+	test_must_fail git for-each-ref --format="%(rest)" refs/heads/main
+'
+
+test_expect_success 'HEAD atom does not take arguments' '
+	test_must_fail git for-each-ref --format="%(HEAD:foo)" 2>err &&
+	echo "fatal: %(HEAD) does not take arguments" >expect &&
+	test_cmp expect err
+'
+
+test_expect_success 'subject atom rejects unknown arguments' '
+	test_must_fail git for-each-ref --format="%(subject:foo)" 2>err &&
+	echo "fatal: unrecognized %(subject) argument: foo" >expect &&
+	test_cmp expect err
+'
+
+test_expect_success 'refname atom rejects unknown arguments' '
+	test_must_fail git for-each-ref --format="%(refname:foo)" 2>err &&
+	echo "fatal: unrecognized %(refname) argument: foo" >expect &&
+	test_cmp expect err
+'
+
 test_expect_success 'trailer parsing not fooled by --- line' '
 	git commit --allow-empty -F - <<-\EOF &&
 	this is the subject
@@ -881,16 +1642,16 @@ test_expect_success 'trailer parsing not fooled by --- line' '
 		echo "trailer: right" &&
 		echo
 	} >expect &&
-	git for-each-ref --format="%(trailers)" refs/heads/master >actual &&
+	git for-each-ref --format="%(trailers)" refs/heads/main >actual &&
 	test_cmp expect actual
 '
 
 test_expect_success 'Add symbolic ref for the following tests' '
-	git symbolic-ref refs/heads/sym refs/heads/master
+	git symbolic-ref refs/heads/sym refs/heads/main
 '
 
 cat >expected <<EOF
-refs/heads/master
+refs/heads/main
 EOF
 
 test_expect_success 'Verify usage of %(symref) atom' '
@@ -899,7 +1660,7 @@ test_expect_success 'Verify usage of %(symref) atom' '
 '
 
 cat >expected <<EOF
-heads/master
+heads/main
 EOF
 
 test_expect_success 'Verify usage of %(symref:short) atom' '
@@ -908,8 +1669,8 @@ test_expect_success 'Verify usage of %(symref:short) atom' '
 '
 
 cat >expected <<EOF
-master
-heads/master
+main
+heads/main
 EOF
 
 test_expect_success 'Verify usage of %(symref:lstrip) atom' '
@@ -938,23 +1699,24 @@ test_expect_success ':remotename and :remoteref' '
 	(
 		cd remote-tests &&
 		test_commit initial &&
+		git branch -M main &&
 		git remote add from fifth.coffee:blub &&
-		git config branch.master.remote from &&
-		git config branch.master.merge refs/heads/stable &&
+		git config branch.main.remote from &&
+		git config branch.main.merge refs/heads/stable &&
 		git remote add to southridge.audio:repo &&
 		git config remote.to.push "refs/heads/*:refs/heads/pushed/*" &&
-		git config branch.master.pushRemote to &&
+		git config branch.main.pushRemote to &&
 		for pair in "%(upstream)=refs/remotes/from/stable" \
 			"%(upstream:remotename)=from" \
 			"%(upstream:remoteref)=refs/heads/stable" \
-			"%(push)=refs/remotes/to/pushed/master" \
+			"%(push)=refs/remotes/to/pushed/main" \
 			"%(push:remotename)=to" \
-			"%(push:remoteref)=refs/heads/pushed/master"
+			"%(push:remoteref)=refs/heads/pushed/main"
 		do
 			echo "${pair#*=}" >expect &&
 			git for-each-ref --format="${pair%=*}" \
-				refs/heads/master >actual &&
-			test_cmp expect actual
+				refs/heads/main >actual &&
+			test_cmp expect actual || exit 1
 		done &&
 		git branch push-simple &&
 		git config branch.push-simple.pushRemote from &&
@@ -966,12 +1728,20 @@ test_expect_success ':remotename and :remoteref' '
 '
 
 test_expect_success 'for-each-ref --ignore-case ignores case' '
-	git for-each-ref --format="%(refname)" refs/heads/MASTER >actual &&
+	git for-each-ref --format="%(refname)" refs/heads/MAIN >actual &&
 	test_must_be_empty actual &&
 
-	echo refs/heads/master >expect &&
+	echo refs/heads/main >expect &&
 	git for-each-ref --format="%(refname)" --ignore-case \
-		refs/heads/MASTER >actual &&
+		refs/heads/MAIN >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'for-each-ref --omit-empty works' '
+	git for-each-ref --format="%(refname)" >actual &&
+	test_line_count -gt 1 actual &&
+	git for-each-ref --format="%(if:equals=refs/heads/main)%(refname)%(then)%(refname)%(end)" --omit-empty >actual &&
+	echo refs/heads/main >expect &&
 	test_cmp expect actual
 '
 
@@ -1015,4 +1785,314 @@ test_expect_success 'for-each-ref --ignore-case works on multiple sort keys' '
 	test_cmp expect actual
 '
 
+test_expect_success 'for-each-ref reports broken tags' '
+	git tag -m "good tag" broken-tag-good HEAD &&
+	git cat-file tag broken-tag-good >good &&
+	sed s/commit/blob/ <good >bad &&
+	bad=$(git hash-object -w -t tag bad) &&
+	git update-ref refs/tags/broken-tag-bad $bad &&
+	test_must_fail git for-each-ref --format="%(*objectname)" \
+		refs/tags/broken-tag-*
+'
+
+test_expect_success 'set up tag with signature and no blank lines' '
+	git tag -F - fake-sig-no-blanks <<-\EOF
+	this is the subject
+	-----BEGIN PGP SIGNATURE-----
+	not a real signature, but we just care about the
+	subject/body parsing. It is important here that
+	there are no blank lines in the signature.
+	-----END PGP SIGNATURE-----
+	EOF
+'
+
+test_atom refs/tags/fake-sig-no-blanks contents:subject 'this is the subject'
+test_atom refs/tags/fake-sig-no-blanks contents:body ''
+test_atom refs/tags/fake-sig-no-blanks contents:signature "$sig"
+
+test_expect_success 'set up tag with CRLF signature' '
+	append_cr <<-\EOF |
+	this is the subject
+	-----BEGIN PGP SIGNATURE-----
+
+	not a real signature, but we just care about
+	the subject/body parsing. It is important here
+	that there is a blank line separating this
+	from the signature header.
+	-----END PGP SIGNATURE-----
+	EOF
+	git tag -F - --cleanup=verbatim fake-sig-crlf
+'
+
+test_atom refs/tags/fake-sig-crlf contents:subject 'this is the subject'
+test_atom refs/tags/fake-sig-crlf contents:body ''
+
+# CRLF is retained in the signature, so we have to pass our expected value
+# through append_cr. But test_atom requires a shell string, which means command
+# substitution, and the shell will strip trailing newlines from the output of
+# the substitution. Hack around it by adding and then removing a dummy line.
+sig_crlf="$(printf "%s" "$sig" | append_cr; echo dummy)"
+sig_crlf=${sig_crlf%dummy}
+test_atom refs/tags/fake-sig-crlf contents:signature "$sig_crlf"
+
+test_expect_success 'git for-each-ref --stdin: empty' '
+	>in &&
+	git for-each-ref --format="%(refname)" --stdin <in >actual &&
+	git for-each-ref --format="%(refname)" >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'git for-each-ref --stdin: fails if extra args' '
+	>in &&
+	test_must_fail git for-each-ref --format="%(refname)" \
+		--stdin refs/heads/extra <in 2>err &&
+	grep "unknown arguments supplied with --stdin" err
+'
+
+test_expect_success 'git for-each-ref --stdin: matches' '
+	cat >in <<-EOF &&
+	refs/tags/multi*
+	refs/heads/amb*
+	EOF
+
+	cat >expect <<-EOF &&
+	refs/heads/ambiguous
+	refs/tags/multi-ref1-100000-user1
+	refs/tags/multi-ref1-100000-user2
+	refs/tags/multi-ref1-200000-user1
+	refs/tags/multi-ref1-200000-user2
+	refs/tags/multi-ref2-100000-user1
+	refs/tags/multi-ref2-100000-user2
+	refs/tags/multi-ref2-200000-user1
+	refs/tags/multi-ref2-200000-user2
+	refs/tags/multiline
+	EOF
+
+	git for-each-ref --format="%(refname)" --stdin <in >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'git for-each-ref with non-existing refs' '
+	cat >in <<-EOF &&
+	refs/heads/this-ref-does-not-exist
+	refs/tags/bogus
+	EOF
+
+	git for-each-ref --format="%(refname)" --stdin <in >actual &&
+	test_must_be_empty actual &&
+
+	xargs git for-each-ref --format="%(refname)" <in >actual &&
+	test_must_be_empty actual
+'
+
+test_expect_success 'git for-each-ref with nested tags' '
+	git tag -am "Normal tag" nested/base HEAD &&
+	git tag -am "Nested tag" nested/nest1 refs/tags/nested/base &&
+	git tag -am "Double nested tag" nested/nest2 refs/tags/nested/nest1 &&
+
+	head_oid="$(git rev-parse HEAD)" &&
+	base_tag_oid="$(git rev-parse refs/tags/nested/base)" &&
+	nest1_tag_oid="$(git rev-parse refs/tags/nested/nest1)" &&
+	nest2_tag_oid="$(git rev-parse refs/tags/nested/nest2)" &&
+
+	cat >expect <<-EOF &&
+	refs/tags/nested/base $base_tag_oid tag $head_oid commit
+	refs/tags/nested/nest1 $nest1_tag_oid tag $head_oid commit
+	refs/tags/nested/nest2 $nest2_tag_oid tag $head_oid commit
+	EOF
+
+	git for-each-ref \
+		--format="%(refname) %(objectname) %(objecttype) %(*objectname) %(*objecttype)" \
+		refs/tags/nested/ >actual &&
+	test_cmp expect actual
+'
+
+GRADE_FORMAT="%(signature:grade)%0a%(signature:key)%0a%(signature:signer)%0a%(signature:fingerprint)%0a%(signature:primarykeyfingerprint)"
+TRUSTLEVEL_FORMAT="%(signature:trustlevel)%0a%(signature:key)%0a%(signature:signer)%0a%(signature:fingerprint)%0a%(signature:primarykeyfingerprint)"
+
+test_expect_success GPG 'setup for signature atom using gpg' '
+	git checkout -b signed &&
+
+	test_when_finished "test_unconfig commit.gpgSign" &&
+
+	echo "1" >file &&
+	git add file &&
+	test_tick &&
+	git commit -S -m "file: 1" &&
+	git tag first-signed &&
+
+	echo "2" >file &&
+	test_tick &&
+	git commit -a -m "file: 2" &&
+	git tag second-unsigned &&
+
+	git config commit.gpgSign 1 &&
+	echo "3" >file &&
+	test_tick &&
+	git commit -a --no-gpg-sign -m "file: 3" &&
+	git tag third-unsigned &&
+
+	test_tick &&
+	git rebase -f HEAD^^ && git tag second-signed HEAD^ &&
+	git tag third-signed &&
+
+	echo "4" >file &&
+	test_tick &&
+	git commit -a -SB7227189 -m "file: 4" &&
+	git tag fourth-signed &&
+
+	echo "5" >file &&
+	test_tick &&
+	git commit -a --no-gpg-sign -m "file: 5" &&
+	git tag fifth-unsigned &&
+
+	echo "6" >file &&
+	test_tick &&
+	git commit -a --no-gpg-sign -m "file: 6" &&
+
+	test_tick &&
+	git rebase -f HEAD^^ &&
+	git tag fifth-signed HEAD^ &&
+	git tag sixth-signed &&
+
+	echo "7" >file &&
+	test_tick &&
+	git commit -a --no-gpg-sign -m "file: 7" &&
+	git tag seventh-unsigned
+'
+
+test_expect_success GPGSSH 'setup for signature atom using ssh' '
+	test_when_finished "test_unconfig gpg.format user.signingkey" &&
+
+	test_config gpg.format ssh &&
+	test_config user.signingkey "${GPGSSH_KEY_PRIMARY}" &&
+	echo "8" >file &&
+	test_tick &&
+	git add file &&
+	git commit -S -m "file: 8" &&
+	git tag eighth-signed-ssh
+'
+
+test_expect_success GPG2 'bare signature atom' '
+	git verify-commit first-signed 2>expect &&
+	echo  >>expect &&
+	git for-each-ref refs/tags/first-signed \
+		--format="%(signature)" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success GPG 'show good signature with custom format' '
+	git verify-commit first-signed &&
+	cat >expect <<-\EOF &&
+	G
+	13B6F51ECDDE430D
+	C O Mitter <committer@example.com>
+	73D758744BE721698EC54E8713B6F51ECDDE430D
+	73D758744BE721698EC54E8713B6F51ECDDE430D
+	EOF
+	git for-each-ref refs/tags/first-signed \
+		--format="$GRADE_FORMAT" >actual &&
+	test_cmp expect actual
+'
+test_expect_success GPGSSH 'show good signature with custom format
+			    with ssh' '
+	test_config gpg.ssh.allowedSignersFile "${GPGSSH_ALLOWED_SIGNERS}" &&
+	FINGERPRINT=$(ssh-keygen -lf "${GPGSSH_KEY_PRIMARY}" | awk "{print \$2;}") &&
+	cat >expect.tmpl <<-\EOF &&
+	G
+	FINGERPRINT
+	principal with number 1
+	FINGERPRINT
+
+	EOF
+	sed "s|FINGERPRINT|$FINGERPRINT|g" expect.tmpl >expect &&
+	git for-each-ref refs/tags/eighth-signed-ssh \
+		--format="$GRADE_FORMAT" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success GPG 'signature atom with grade option and bad signature' '
+	git cat-file commit third-signed >raw &&
+	sed -e "s/^file: 3/file: 3 forged/" raw >forged1 &&
+	FORGED1=$(git hash-object -w -t commit forged1) &&
+	git update-ref refs/tags/third-signed "$FORGED1" &&
+	test_must_fail git verify-commit "$FORGED1" &&
+
+	cat >expect <<-\EOF &&
+	B
+	13B6F51ECDDE430D
+	C O Mitter <committer@example.com>
+
+
+	EOF
+	git for-each-ref refs/tags/third-signed \
+		--format="$GRADE_FORMAT" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success GPG 'show untrusted signature with custom format' '
+	cat >expect <<-\EOF &&
+	U
+	65A0EEA02E30CAD7
+	Eris Discordia <discord@example.net>
+	F8364A59E07FFE9F4D63005A65A0EEA02E30CAD7
+	D4BE22311AD3131E5EDA29A461092E85B7227189
+	EOF
+	git for-each-ref refs/tags/fourth-signed \
+		--format="$GRADE_FORMAT" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success GPG 'show untrusted signature with undefined trust level' '
+	cat >expect <<-\EOF &&
+	undefined
+	65A0EEA02E30CAD7
+	Eris Discordia <discord@example.net>
+	F8364A59E07FFE9F4D63005A65A0EEA02E30CAD7
+	D4BE22311AD3131E5EDA29A461092E85B7227189
+	EOF
+	git for-each-ref refs/tags/fourth-signed \
+		--format="$TRUSTLEVEL_FORMAT" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success GPG 'show untrusted signature with ultimate trust level' '
+	cat >expect <<-\EOF &&
+	ultimate
+	13B6F51ECDDE430D
+	C O Mitter <committer@example.com>
+	73D758744BE721698EC54E8713B6F51ECDDE430D
+	73D758744BE721698EC54E8713B6F51ECDDE430D
+	EOF
+	git for-each-ref refs/tags/sixth-signed \
+		--format="$TRUSTLEVEL_FORMAT" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success GPG 'show unknown signature with custom format' '
+	cat >expect <<-\EOF &&
+	E
+	13B6F51ECDDE430D
+
+
+
+	EOF
+	GNUPGHOME="$GNUPGHOME_NOT_USED" git for-each-ref \
+		refs/tags/sixth-signed --format="$GRADE_FORMAT" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success GPG 'show lack of signature with custom format' '
+	cat >expect <<-\EOF &&
+	N
+
+
+
+
+	EOF
+	git for-each-ref refs/tags/seventh-unsigned \
+		--format="$GRADE_FORMAT" >actual &&
+	test_cmp expect actual
+'
+
 test_done
diff --git a/t/t6301-for-each-ref-errors.sh b/t/t6301-for-each-ref-errors.sh
index 809854f..83b8a19 100755
--- a/t/t6301-for-each-ref-errors.sh
+++ b/t/t6301-for-each-ref-errors.sh
@@ -2,6 +2,7 @@
 
 test_description='for-each-ref errors for broken refs'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 ZEROS=$ZERO_OID
@@ -14,43 +15,56 @@ test_expect_success setup '
 	git for-each-ref --format="%(objectname) %(refname)" >brief-list
 '
 
-test_expect_success 'Broken refs are reported correctly' '
+test_expect_success REFFILES 'Broken refs are reported correctly' '
 	r=refs/heads/bogus &&
 	: >.git/$r &&
 	test_when_finished "rm -f .git/$r" &&
 	echo "warning: ignoring broken ref $r" >broken-err &&
 	git for-each-ref >out 2>err &&
-	test_i18ncmp full-list out &&
-	test_i18ncmp broken-err err
+	test_cmp full-list out &&
+	test_cmp broken-err err
 '
 
-test_expect_success 'NULL_SHA1 refs are reported correctly' '
+test_expect_success REFFILES 'NULL_SHA1 refs are reported correctly' '
 	r=refs/heads/zeros &&
 	echo $ZEROS >.git/$r &&
 	test_when_finished "rm -f .git/$r" &&
 	echo "warning: ignoring broken ref $r" >zeros-err &&
 	git for-each-ref >out 2>err &&
 	test_cmp full-list out &&
-	test_i18ncmp zeros-err err &&
+	test_cmp zeros-err err &&
 	git for-each-ref --format="%(objectname) %(refname)" >brief-out 2>brief-err &&
 	test_cmp brief-list brief-out &&
-	test_i18ncmp zeros-err brief-err
+	test_cmp zeros-err brief-err
 '
 
 test_expect_success 'Missing objects are reported correctly' '
-	r=refs/heads/missing &&
-	echo $MISSING >.git/$r &&
-	test_when_finished "rm -f .git/$r" &&
-	echo "fatal: missing object $MISSING for $r" >missing-err &&
+	test_when_finished "git update-ref -d refs/heads/missing" &&
+	test-tool ref-store main update-ref msg refs/heads/missing "$MISSING" "$ZERO_OID" REF_SKIP_OID_VERIFICATION &&
+	echo "fatal: missing object $MISSING for refs/heads/missing" >missing-err &&
 	test_must_fail git for-each-ref 2>err &&
-	test_i18ncmp missing-err err &&
+	test_cmp missing-err err &&
 	(
 		cat brief-list &&
-		echo "$MISSING $r"
+		echo "$MISSING refs/heads/missing"
 	) | sort -k 2 >missing-brief-expected &&
 	git for-each-ref --format="%(objectname) %(refname)" >brief-out 2>brief-err &&
 	test_cmp missing-brief-expected brief-out &&
 	test_must_be_empty brief-err
 '
 
+test_expect_success 'ahead-behind requires an argument' '
+	test_must_fail git for-each-ref \
+		--format="%(ahead-behind)" 2>err &&
+	echo "fatal: expected format: %(ahead-behind:<committish>)" >expect &&
+	test_cmp expect err
+'
+
+test_expect_success 'missing ahead-behind base' '
+	test_must_fail git for-each-ref \
+		--format="%(ahead-behind:refs/heads/missing)" 2>err &&
+	echo "fatal: failed to find '\''refs/heads/missing'\''" >expect &&
+	test_cmp expect err
+'
+
 test_done
diff --git a/t/t6302-for-each-ref-filter.sh b/t/t6302-for-each-ref-filter.sh
index 35408d5..948f1bb 100755
--- a/t/t6302-for-each-ref-filter.sh
+++ b/t/t6302-for-each-ref-filter.sh
@@ -7,6 +7,7 @@ test_description='test for-each-refs usage of ref-filter APIs'
 
 test_expect_success 'setup some history and refs' '
 	test_commit one &&
+	git branch -M main &&
 	test_commit two &&
 	test_commit three &&
 	git checkout -b side &&
@@ -26,17 +27,48 @@ test_expect_success 'setup some history and refs' '
 	git tag $sign -m "A signed tag" signed-tag &&
 	git tag $sign -m "Signed doubly" doubly-signed-tag signed-tag &&
 
-	git checkout master &&
-	git update-ref refs/odd/spot master
+	git checkout main &&
+	git update-ref refs/odd/spot main
+'
+
+test_expect_success '--include-root-refs pattern prints pseudorefs' '
+	cat >expect <<-\EOF &&
+	HEAD
+	ORIG_HEAD
+	refs/heads/main
+	refs/heads/side
+	refs/odd/spot
+	refs/tags/annotated-tag
+	refs/tags/doubly-annotated-tag
+	refs/tags/doubly-signed-tag
+	refs/tags/four
+	refs/tags/one
+	refs/tags/signed-tag
+	refs/tags/three
+	refs/tags/two
+	EOF
+	git update-ref ORIG_HEAD main &&
+	git for-each-ref --format="%(refname)" --include-root-refs >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success '--include-root-refs with other patterns' '
+	cat >expect <<-\EOF &&
+	HEAD
+	ORIG_HEAD
+	EOF
+	git update-ref ORIG_HEAD main &&
+	git for-each-ref --format="%(refname)" --include-root-refs "*HEAD" >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success 'filtering with --points-at' '
 	cat >expect <<-\EOF &&
-	refs/heads/master
+	refs/heads/main
 	refs/odd/spot
 	refs/tags/three
 	EOF
-	git for-each-ref --format="%(refname)" --points-at=master >actual &&
+	git for-each-ref --format="%(refname)" --points-at=main >actual &&
 	test_cmp expect actual
 '
 
@@ -44,6 +76,8 @@ test_expect_success 'check signed tags with --points-at' '
 	sed -e "s/Z$//" >expect <<-\EOF &&
 	refs/heads/side Z
 	refs/tags/annotated-tag four
+	refs/tags/doubly-annotated-tag four
+	refs/tags/doubly-signed-tag four
 	refs/tags/four Z
 	refs/tags/signed-tag four
 	EOF
@@ -53,13 +87,13 @@ test_expect_success 'check signed tags with --points-at' '
 
 test_expect_success 'filtering with --merged' '
 	cat >expect <<-\EOF &&
-	refs/heads/master
+	refs/heads/main
 	refs/odd/spot
 	refs/tags/one
 	refs/tags/three
 	refs/tags/two
 	EOF
-	git for-each-ref --format="%(refname)" --merged=master >actual &&
+	git for-each-ref --format="%(refname)" --merged=main >actual &&
 	test_cmp expect actual
 '
 
@@ -72,13 +106,13 @@ test_expect_success 'filtering with --no-merged' '
 	refs/tags/four
 	refs/tags/signed-tag
 	EOF
-	git for-each-ref --format="%(refname)" --no-merged=master >actual &&
+	git for-each-ref --format="%(refname)" --no-merged=main >actual &&
 	test_cmp expect actual
 '
 
 test_expect_success 'filtering with --contains' '
 	cat >expect <<-\EOF &&
-	refs/heads/master
+	refs/heads/main
 	refs/heads/side
 	refs/odd/spot
 	refs/tags/annotated-tag
@@ -113,9 +147,28 @@ test_expect_success '%(color) must fail' '
 	test_must_fail git for-each-ref --format="%(color)%(refname)"
 '
 
+test_expect_success '%(color:#aa22ac) must succeed' '
+	test_when_finished rm -rf test &&
+	git init test &&
+	(
+		cd test &&
+		test_commit initial &&
+		git branch -M main &&
+		cat >expect <<-\EOF &&
+		refs/heads/main
+		refs/tags/initial
+		EOF
+		git remote add origin nowhere &&
+		git config branch.main.remote origin &&
+		git config branch.main.merge refs/heads/main &&
+		git for-each-ref --format="%(color:#aa22ac)%(refname)" >actual &&
+		test_cmp expect actual
+	)
+'
+
 test_expect_success 'left alignment is default' '
 	cat >expect <<-\EOF &&
-	refname is refs/heads/master  |refs/heads/master
+	refname is refs/heads/main    |refs/heads/main
 	refname is refs/heads/side    |refs/heads/side
 	refname is refs/odd/spot      |refs/odd/spot
 	refname is refs/tags/annotated-tag|refs/tags/annotated-tag
@@ -133,7 +186,7 @@ test_expect_success 'left alignment is default' '
 
 test_expect_success 'middle alignment' '
 	cat >expect <<-\EOF &&
-	| refname is refs/heads/master |refs/heads/master
+	|  refname is refs/heads/main  |refs/heads/main
 	|  refname is refs/heads/side  |refs/heads/side
 	|   refname is refs/odd/spot   |refs/odd/spot
 	|refname is refs/tags/annotated-tag|refs/tags/annotated-tag
@@ -151,7 +204,7 @@ test_expect_success 'middle alignment' '
 
 test_expect_success 'right alignment' '
 	cat >expect <<-\EOF &&
-	|  refname is refs/heads/master|refs/heads/master
+	|    refname is refs/heads/main|refs/heads/main
 	|    refname is refs/heads/side|refs/heads/side
 	|      refname is refs/odd/spot|refs/odd/spot
 	|refname is refs/tags/annotated-tag|refs/tags/annotated-tag
@@ -168,7 +221,7 @@ test_expect_success 'right alignment' '
 '
 
 cat >expect <<-\EOF
-|       refname is refs/heads/master       |refs/heads/master
+|        refname is refs/heads/main        |refs/heads/main
 |        refname is refs/heads/side        |refs/heads/side
 |         refname is refs/odd/spot         |refs/odd/spot
 |    refname is refs/tags/annotated-tag    |refs/tags/annotated-tag
@@ -215,7 +268,7 @@ EOF
 
 test_expect_success 'alignment with format quote' "
 	cat >expect <<-\EOF &&
-	|'      '\''master| A U Thor'\''      '|
+	|'       '\''main| A U Thor'\''       '|
 	|'       '\''side| A U Thor'\''       '|
 	|'     '\''odd/spot| A U Thor'\''     '|
 	|'      '\''annotated-tag| '\''       '|
@@ -233,7 +286,7 @@ test_expect_success 'alignment with format quote' "
 
 test_expect_success 'nested alignment with quote formatting' "
 	cat >expect <<-\EOF &&
-	|'         master               '|
+	|'           main               '|
 	|'           side               '|
 	|'       odd/spot               '|
 	|'  annotated-tag               '|
@@ -251,7 +304,7 @@ test_expect_success 'nested alignment with quote formatting' "
 
 test_expect_success 'check `%(contents:lines=1)`' '
 	cat >expect <<-\EOF &&
-	master |three
+	main |three
 	side |four
 	odd/spot |three
 	annotated-tag |An annotated tag
@@ -269,7 +322,7 @@ test_expect_success 'check `%(contents:lines=1)`' '
 
 test_expect_success 'check `%(contents:lines=0)`' '
 	cat >expect <<-\EOF &&
-	master |
+	main |
 	side |
 	odd/spot |
 	annotated-tag |
@@ -287,7 +340,7 @@ test_expect_success 'check `%(contents:lines=0)`' '
 
 test_expect_success 'check `%(contents:lines=99999)`' '
 	cat >expect <<-\EOF &&
-	master |three
+	main |three
 	side |four
 	odd/spot |three
 	annotated-tag |An annotated tag
@@ -360,7 +413,7 @@ test_expect_success 'improper usage of %(if), %(then), %(else) and %(end) atoms'
 test_expect_success 'check %(if)...%(then)...%(end) atoms' '
 	git for-each-ref --format="%(refname)%(if)%(authorname)%(then) Author: %(authorname)%(end)" >actual &&
 	cat >expect <<-\EOF &&
-	refs/heads/master Author: A U Thor
+	refs/heads/main Author: A U Thor
 	refs/heads/side Author: A U Thor
 	refs/odd/spot Author: A U Thor
 	refs/tags/annotated-tag
@@ -381,7 +434,7 @@ test_expect_success 'check %(if)...%(then)...%(end) atoms' '
 test_expect_success 'check %(if)...%(then)...%(else)...%(end) atoms' '
 	git for-each-ref --format="%(if)%(authorname)%(then)%(authorname)%(else)No author%(end): %(refname)" >actual &&
 	cat >expect <<-\EOF &&
-	A U Thor: refs/heads/master
+	A U Thor: refs/heads/main
 	A U Thor: refs/heads/side
 	A U Thor: refs/odd/spot
 	No author: refs/tags/annotated-tag
@@ -401,7 +454,7 @@ test_expect_success 'check %(if)...%(then)...%(else)...%(end) atoms' '
 test_expect_success 'ignore spaces in %(if) atom usage' '
 	git for-each-ref --format="%(refname:short): %(if)%(HEAD)%(then)Head ref%(else)Not Head ref%(end)" >actual &&
 	cat >expect <<-\EOF &&
-	master: Head ref
+	main: Head ref
 	side: Not Head ref
 	odd/spot: Not Head ref
 	annotated-tag: Not Head ref
@@ -420,34 +473,34 @@ test_expect_success 'ignore spaces in %(if) atom usage' '
 '
 
 test_expect_success 'check %(if:equals=<string>)' '
-	git for-each-ref --format="%(if:equals=master)%(refname:short)%(then)Found master%(else)Not master%(end)" refs/heads/ >actual &&
+	git for-each-ref --format="%(if:equals=main)%(refname:short)%(then)Found main%(else)Not main%(end)" refs/heads/ >actual &&
 	cat >expect <<-\EOF &&
-	Found master
-	Not master
+	Found main
+	Not main
 	EOF
 	test_cmp expect actual
 '
 
 test_expect_success 'check %(if:notequals=<string>)' '
-	git for-each-ref --format="%(if:notequals=master)%(refname:short)%(then)Not master%(else)Found master%(end)" refs/heads/ >actual &&
+	git for-each-ref --format="%(if:notequals=main)%(refname:short)%(then)Not main%(else)Found main%(end)" refs/heads/ >actual &&
 	cat >expect <<-\EOF &&
-	Found master
-	Not master
+	Found main
+	Not main
 	EOF
 	test_cmp expect actual
 '
 
-test_expect_success '--merged is incompatible with --no-merged' '
-	test_must_fail git for-each-ref --merged HEAD --no-merged HEAD
+test_expect_success '--merged is compatible with --no-merged' '
+	git for-each-ref --merged HEAD --no-merged HEAD
 '
 
 test_expect_success 'validate worktree atom' '
 	cat >expect <<-EOF &&
-	master: $(pwd)
-	master_worktree: $(pwd)/worktree_dir
+	main: $(pwd)
+	main_worktree: $(pwd)/worktree_dir
 	side: not checked out
 	EOF
-	git worktree add -b master_worktree worktree_dir master &&
+	git worktree add -b main_worktree worktree_dir main &&
 	git for-each-ref --format="%(refname:short): %(if)%(worktreepath)%(then)%(worktreepath)%(else)not checked out%(end)" refs/heads/ >actual &&
 	rm -r worktree_dir &&
 	git worktree prune &&
diff --git a/t/t6020-merge-df.sh b/t/t6400-merge-df.sh
index 400a4cd..3de4ef6 100755
--- a/t/t6020-merge-df.sh
+++ b/t/t6400-merge-df.sh
@@ -4,6 +4,9 @@
 #
 
 test_description='Test merge with directory/file conflicts'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 test_expect_success 'prepare repository' '
@@ -24,12 +27,12 @@ test_expect_success 'prepare repository' '
 '
 
 test_expect_success 'Merge with d/f conflicts' '
-	test_expect_code 1 git merge -m "merge msg" master
+	test_expect_code 1 git merge -m "merge msg" main
 '
 
 test_expect_success 'F/D conflict' '
 	git reset --hard &&
-	git checkout master &&
+	git checkout main &&
 	rm .git/index &&
 
 	mkdir before &&
@@ -47,7 +50,7 @@ test_expect_success 'F/D conflict' '
 	git add . &&
 	git commit -m para &&
 
-	git merge master
+	git merge main
 '
 
 test_expect_success 'setup modify/delete + directory/file conflict' '
@@ -79,9 +82,14 @@ test_expect_success 'modify/delete + directory/file conflict' '
 	git checkout delete^0 &&
 	test_must_fail git merge modify &&
 
-	test 5 -eq $(git ls-files -s | wc -l) &&
-	test 4 -eq $(git ls-files -u | wc -l) &&
-	test 1 -eq $(git ls-files -o | wc -l) &&
+	test_stdout_line_count = 5 git ls-files -s &&
+	test_stdout_line_count = 4 git ls-files -u &&
+	if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+	then
+		test_stdout_line_count = 0 git ls-files -o
+	else
+		test_stdout_line_count = 1 git ls-files -o
+	fi &&
 
 	test_path_is_file letters/file &&
 	test_path_is_file letters.txt &&
@@ -95,9 +103,14 @@ test_expect_success 'modify/delete + directory/file conflict; other way' '
 
 	test_must_fail git merge delete &&
 
-	test 5 -eq $(git ls-files -s | wc -l) &&
-	test 4 -eq $(git ls-files -u | wc -l) &&
-	test 1 -eq $(git ls-files -o | wc -l) &&
+	test_stdout_line_count = 5 git ls-files -s &&
+	test_stdout_line_count = 4 git ls-files -u &&
+	if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+	then
+		test_stdout_line_count = 0 git ls-files -o
+	else
+		test_stdout_line_count = 1 git ls-files -o
+	fi &&
 
 	test_path_is_file letters/file &&
 	test_path_is_file letters.txt &&
@@ -113,7 +126,7 @@ test_expect_success 'Simple merge in repo with interesting pathnames' '
 	#     foo/bar-2/baz
 	# The fact that foo/bar-2 appears between foo/bar and foo/bar/baz
 	# can trip up some codepaths, and is the point of this test.
-	test_create_repo name-ordering &&
+	git init name-ordering &&
 	(
 		cd name-ordering &&
 
@@ -124,7 +137,7 @@ test_expect_success 'Simple merge in repo with interesting pathnames' '
 		git add . &&
 		git commit -m initial &&
 
-		git branch main &&
+		git branch topic &&
 		git branch other &&
 
 		git checkout other &&
@@ -132,10 +145,10 @@ test_expect_success 'Simple merge in repo with interesting pathnames' '
 		git add -u &&
 		git commit -m other &&
 
-		git checkout main &&
-		echo main >foo/bar/baz &&
+		git checkout topic &&
+		echo topic >foo/bar/baz &&
 		git add -u &&
-		git commit -m main &&
+		git commit -m topic &&
 
 		git merge other &&
 		git ls-files -s >out &&
diff --git a/t/t6021-merge-criss-cross.sh b/t/t6401-merge-criss-cross.sh
index 9d5e992..1962310 100755
--- a/t/t6021-merge-criss-cross.sh
+++ b/t/t6401-merge-criss-cross.sh
@@ -8,6 +8,8 @@
 
 
 test_description='Test criss-cross merge'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'prepare repository' '
diff --git a/t/t6022-merge-rename.sh b/t/t6402-merge-rename.sh
index bbbba3d..2738b50 100755
--- a/t/t6022-merge-rename.sh
+++ b/t/t6402-merge-rename.sh
@@ -1,6 +1,9 @@
 #!/bin/sh
 
 test_description='Merge-recursive merging renames'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 modify () {
@@ -54,9 +57,9 @@ test_expect_success 'setup' '
 	git branch change &&
 	git branch change+rename &&
 
-	sed -e "/^g /s/.*/g : master changes a line/" <A >A+ &&
+	sed -e "/^g /s/.*/g : main changes a line/" <A >A+ &&
 	mv A+ A &&
-	git commit -a -m "master updates A" &&
+	git commit -a -m "main updates A" &&
 
 	git checkout yellow &&
 	rm -f M &&
@@ -94,22 +97,20 @@ test_expect_success 'setup' '
 	git update-index --add B &&
 	git commit -q -a -m "changed and renamed" &&
 
-	git checkout master
+	git checkout main
 '
 
 test_expect_success 'pull renaming branch into unrenaming one' \
 '
 	git show-branch &&
-	test_expect_code 1 git pull . white &&
+	test_expect_code 1 git pull --no-rebase . white &&
 	git ls-files -s &&
-	git ls-files -u B >b.stages &&
-	test_line_count = 3 b.stages &&
-	git ls-files -s N >n.stages &&
-	test_line_count = 1 n.stages &&
+	test_stdout_line_count = 3 git ls-files -u B &&
+	test_stdout_line_count = 1 git ls-files -s N &&
 	sed -ne "/^g/{
 	p
 	q
-	}" B | grep master &&
+	}" B | grep main &&
 	git diff --exit-code white N
 '
 
@@ -118,11 +119,9 @@ test_expect_success 'pull renaming branch into another renaming one' \
 	rm -f B &&
 	git reset --hard &&
 	git checkout red &&
-	test_expect_code 1 git pull . white &&
-	git ls-files -u B >b.stages &&
-	test_line_count = 3 b.stages &&
-	git ls-files -s N >n.stages &&
-	test_line_count = 1 n.stages &&
+	test_expect_code 1 git pull --no-rebase . white &&
+	test_stdout_line_count = 3 git ls-files -u B &&
+	test_stdout_line_count = 1 git ls-files -s N &&
 	sed -ne "/^g/{
 	p
 	q
@@ -134,11 +133,9 @@ test_expect_success 'pull unrenaming branch into renaming one' \
 '
 	git reset --hard &&
 	git show-branch &&
-	test_expect_code 1 git pull . master &&
-	git ls-files -u B >b.stages &&
-	test_line_count = 3 b.stages &&
-	git ls-files -s N >n.stages &&
-	test_line_count = 1 n.stages &&
+	test_expect_code 1 git pull --no-rebase . main &&
+	test_stdout_line_count = 3 git ls-files -u B &&
+	test_stdout_line_count = 1 git ls-files -s N &&
 	sed -ne "/^g/{
 	p
 	q
@@ -150,15 +147,11 @@ test_expect_success 'pull conflicting renames' \
 '
 	git reset --hard &&
 	git show-branch &&
-	test_expect_code 1 git pull . blue &&
-	git ls-files -u A >a.stages &&
-	test_line_count = 1 a.stages &&
-	git ls-files -u B >b.stages &&
-	test_line_count = 1 b.stages &&
-	git ls-files -u C >c.stages &&
-	test_line_count = 1 c.stages &&
-	git ls-files -s N >n.stages &&
-	test_line_count = 1 n.stages &&
+	test_expect_code 1 git pull --no-rebase . blue &&
+	test_stdout_line_count = 1 git ls-files -u A &&
+	test_stdout_line_count = 1 git ls-files -u B &&
+	test_stdout_line_count = 1 git ls-files -u C &&
+	test_stdout_line_count = 1 git ls-files -s N &&
 	sed -ne "/^g/{
 	p
 	q
@@ -170,7 +163,7 @@ test_expect_success 'interference with untracked working tree file' '
 	git reset --hard &&
 	git show-branch &&
 	echo >A this file should not matter &&
-	test_expect_code 1 git pull . white &&
+	test_expect_code 1 git pull --no-rebase . white &&
 	test_path_is_file A
 '
 
@@ -180,17 +173,17 @@ test_expect_success 'interference with untracked working tree file' '
 	git show-branch &&
 	rm -f A &&
 	echo >A this file should not matter &&
-	test_expect_code 1 git pull . red &&
+	test_expect_code 1 git pull --no-rebase . red &&
 	test_path_is_file A
 '
 
 test_expect_success 'interference with untracked working tree file' '
 	git reset --hard &&
 	rm -f A M &&
-	git checkout -f master &&
+	git checkout -f main &&
 	git tag -f anchor &&
 	git show-branch &&
-	git pull . yellow &&
+	git pull --no-rebase . yellow &&
 	test_path_is_missing M &&
 	git reset --hard anchor
 '
@@ -198,7 +191,7 @@ test_expect_success 'interference with untracked working tree file' '
 test_expect_success 'updated working tree file should prevent the merge' '
 	git reset --hard &&
 	rm -f A M &&
-	git checkout -f master &&
+	git checkout -f main &&
 	git tag -f anchor &&
 	git show-branch &&
 	echo >>M one line addition &&
@@ -211,13 +204,13 @@ test_expect_success 'updated working tree file should prevent the merge' '
 test_expect_success 'updated working tree file should prevent the merge' '
 	git reset --hard &&
 	rm -f A M &&
-	git checkout -f master &&
+	git checkout -f main &&
 	git tag -f anchor &&
 	git show-branch &&
 	echo >>M one line addition &&
 	cat M >M.saved &&
 	git update-index M &&
-	test_expect_code 128 git pull . yellow &&
+	test_expect_code 2 git pull --no-rebase . yellow &&
 	test_cmp M M.saved &&
 	rm -f M.saved
 '
@@ -229,7 +222,7 @@ test_expect_success 'interference with untracked working tree file' '
 	git tag -f anchor &&
 	git show-branch &&
 	echo >M this file should not matter &&
-	git pull . master &&
+	git pull --no-rebase . main &&
 	test_path_is_file M &&
 	! {
 		git ls-files -s |
@@ -318,12 +311,17 @@ test_expect_success 'Rename+D/F conflict; renamed file merges but dir in way' '
 	git checkout -q renamed-file-has-no-conflicts^0 &&
 	test_must_fail git merge --strategy=recursive dir-in-way >output &&
 
-	test_i18ngrep "CONFLICT (modify/delete): dir/file-in-the-way" output &&
-	test_i18ngrep "Auto-merging dir" output &&
-	test_i18ngrep "Adding as dir~HEAD instead" output &&
+	test_grep "CONFLICT (modify/delete): dir/file-in-the-way" output &&
+	test_grep "Auto-merging dir" output &&
+	if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+	then
+		test_grep "moving it to dir~HEAD instead" output
+	else
+		test_grep "Adding as dir~HEAD instead" output
+	fi &&
 
-	test 3 -eq "$(git ls-files -u | wc -l)" &&
-	test 2 -eq "$(git ls-files -u dir/file-in-the-way | wc -l)" &&
+	test_stdout_line_count = 3 git ls-files -u &&
+	test_stdout_line_count = 2 git ls-files -u dir/file-in-the-way &&
 
 	test_must_fail git diff --quiet &&
 	test_must_fail git diff --cached --quiet &&
@@ -340,12 +338,17 @@ test_expect_success 'Same as previous, but merged other way' '
 	test_must_fail git merge --strategy=recursive renamed-file-has-no-conflicts >output 2>errors &&
 
 	! grep "error: refusing to lose untracked file at" errors &&
-	test_i18ngrep "CONFLICT (modify/delete): dir/file-in-the-way" output &&
-	test_i18ngrep "Auto-merging dir" output &&
-	test_i18ngrep "Adding as dir~renamed-file-has-no-conflicts instead" output &&
-
-	test 3 -eq "$(git ls-files -u | wc -l)" &&
-	test 2 -eq "$(git ls-files -u dir/file-in-the-way | wc -l)" &&
+	test_grep "CONFLICT (modify/delete): dir/file-in-the-way" output &&
+	test_grep "Auto-merging dir" output &&
+	if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+	then
+		test_grep "moving it to dir~renamed-file-has-no-conflicts instead" output
+	else
+		test_grep "Adding as dir~renamed-file-has-no-conflicts instead" output
+	fi &&
+
+	test_stdout_line_count = 3 git ls-files -u &&
+	test_stdout_line_count = 2 git ls-files -u dir/file-in-the-way &&
 
 	test_must_fail git diff --quiet &&
 	test_must_fail git diff --cached --quiet &&
@@ -361,8 +364,8 @@ test_expect_success 'Rename+D/F conflict; renamed file cannot merge, dir not in
 	git checkout -q renamed-file-has-conflicts^0 &&
 	test_must_fail git merge --strategy=recursive dir-not-in-way &&
 
-	test 3 -eq "$(git ls-files -u | wc -l)" &&
-	test 3 -eq "$(git ls-files -u dir | wc -l)" &&
+	test_stdout_line_count = 3 git ls-files -u &&
+	test_stdout_line_count = 3 git ls-files -u dir &&
 
 	test_must_fail git diff --quiet &&
 	test_must_fail git diff --cached --quiet &&
@@ -396,9 +399,16 @@ test_expect_success 'Rename+D/F conflict; renamed file cannot merge and dir in t
 	git checkout -q renamed-file-has-conflicts^0 &&
 	test_must_fail git merge --strategy=recursive dir-in-way &&
 
-	test 5 -eq "$(git ls-files -u | wc -l)" &&
-	test 3 -eq "$(git ls-files -u dir | grep -v file-in-the-way | wc -l)" &&
-	test 2 -eq "$(git ls-files -u dir/file-in-the-way | wc -l)" &&
+	test_stdout_line_count = 5 git ls-files -u &&
+	if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+	then
+		test_stdout_line_count = 3 git ls-files -u dir~HEAD
+	else
+		git ls-files -u dir >out &&
+		test 3 -eq $(grep -v file-in-the-way out | wc -l) &&
+		rm -f out
+	fi &&
+	test_stdout_line_count = 2 git ls-files -u dir/file-in-the-way &&
 
 	test_must_fail git diff --quiet &&
 	test_must_fail git diff --cached --quiet &&
@@ -414,9 +424,16 @@ test_expect_success 'Same as previous, but merged other way' '
 	git checkout -q dir-in-way^0 &&
 	test_must_fail git merge --strategy=recursive renamed-file-has-conflicts &&
 
-	test 5 -eq "$(git ls-files -u | wc -l)" &&
-	test 3 -eq "$(git ls-files -u dir | grep -v file-in-the-way | wc -l)" &&
-	test 2 -eq "$(git ls-files -u dir/file-in-the-way | wc -l)" &&
+	test_stdout_line_count = 5 git ls-files -u &&
+	if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+	then
+		test_stdout_line_count = 3 git ls-files -u dir~renamed-file-has-conflicts
+	else
+		git ls-files -u dir >out &&
+		test 3 -eq $(grep -v file-in-the-way out | wc -l) &&
+		rm -f out
+	fi &&
+	test_stdout_line_count = 2 git ls-files -u dir/file-in-the-way &&
 
 	test_must_fail git diff --quiet &&
 	test_must_fail git diff --cached --quiet &&
@@ -471,7 +488,12 @@ test_expect_success 'both rename source and destination involved in D/F conflict
 	git checkout -q rename-dest^0 &&
 	test_must_fail git merge --strategy=recursive source-conflict &&
 
-	test 1 -eq "$(git ls-files -u | wc -l)" &&
+	if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+	then
+		test_stdout_line_count = 2 git ls-files -u
+	else
+		test_stdout_line_count = 1 git ls-files -u
+	fi &&
 
 	test_must_fail git diff --quiet &&
 
@@ -505,34 +527,63 @@ test_expect_success 'setup pair rename to parent of other (D/F conflicts)' '
 	git commit -m "Rename one/file -> two"
 '
 
-test_expect_success 'pair rename to parent of other (D/F conflicts) w/ untracked dir' '
-	git checkout -q rename-one^0 &&
-	mkdir one &&
-	test_must_fail git merge --strategy=recursive rename-two &&
+if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+then
+	test_expect_success 'pair rename to parent of other (D/F conflicts) w/ untracked dir' '
+		git checkout -q rename-one^0 &&
+		mkdir one &&
+		test_must_fail git merge --strategy=recursive rename-two &&
 
-	test 2 -eq "$(git ls-files -u | wc -l)" &&
-	test 1 -eq "$(git ls-files -u one | wc -l)" &&
-	test 1 -eq "$(git ls-files -u two | wc -l)" &&
+		test_stdout_line_count = 4 git ls-files -u &&
+		test_stdout_line_count = 2 git ls-files -u one &&
+		test_stdout_line_count = 2 git ls-files -u two &&
 
-	test_must_fail git diff --quiet &&
+		test_must_fail git diff --quiet &&
 
-	test 4 -eq $(find . | grep -v .git | wc -l) &&
+		test 3 -eq $(find . | grep -v .git | wc -l) &&
 
-	test_path_is_dir one &&
-	test_path_is_file one~rename-two &&
-	test_path_is_file two &&
-	test "other" = $(cat one~rename-two) &&
-	test "stuff" = $(cat two)
-'
+		test_path_is_file one &&
+		test_path_is_file two &&
+		test "other" = $(cat one) &&
+		test "stuff" = $(cat two)
+	'
+else
+	test_expect_success 'pair rename to parent of other (D/F conflicts) w/ untracked dir' '
+		git checkout -q rename-one^0 &&
+		mkdir one &&
+		test_must_fail git merge --strategy=recursive rename-two &&
+
+		test_stdout_line_count = 2 git ls-files -u &&
+		test_stdout_line_count = 1 git ls-files -u one &&
+		test_stdout_line_count = 1 git ls-files -u two &&
+
+		test_must_fail git diff --quiet &&
+
+		test 4 -eq $(find . | grep -v .git | wc -l) &&
+
+		test_path_is_dir one &&
+		test_path_is_file one~rename-two &&
+		test_path_is_file two &&
+		test "other" = $(cat one~rename-two) &&
+		test "stuff" = $(cat two)
+	'
+fi
 
 test_expect_success 'pair rename to parent of other (D/F conflicts) w/ clean start' '
 	git reset --hard &&
 	git clean -fdqx &&
 	test_must_fail git merge --strategy=recursive rename-two &&
 
-	test 2 -eq "$(git ls-files -u | wc -l)" &&
-	test 1 -eq "$(git ls-files -u one | wc -l)" &&
-	test 1 -eq "$(git ls-files -u two | wc -l)" &&
+	if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+	then
+		test_stdout_line_count = 4 git ls-files -u &&
+		test_stdout_line_count = 2 git ls-files -u one &&
+		test_stdout_line_count = 2 git ls-files -u two
+	else
+		test_stdout_line_count = 2 git ls-files -u &&
+		test_stdout_line_count = 1 git ls-files -u one &&
+		test_stdout_line_count = 1 git ls-files -u two
+	fi &&
 
 	test_must_fail git diff --quiet &&
 
@@ -572,12 +623,22 @@ test_expect_success 'check handling of differently renamed file with D/F conflic
 	git checkout -q first-rename^0 &&
 	test_must_fail git merge --strategy=recursive second-rename &&
 
-	test 5 -eq "$(git ls-files -s | wc -l)" &&
-	test 3 -eq "$(git ls-files -u | wc -l)" &&
-	test 1 -eq "$(git ls-files -u one | wc -l)" &&
-	test 1 -eq "$(git ls-files -u two | wc -l)" &&
-	test 1 -eq "$(git ls-files -u original | wc -l)" &&
-	test 2 -eq "$(git ls-files -o | wc -l)" &&
+	if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+	then
+		test_stdout_line_count = 5 git ls-files -s &&
+		test_stdout_line_count = 3 git ls-files -u &&
+		test_stdout_line_count = 1 git ls-files -u one~HEAD &&
+		test_stdout_line_count = 1 git ls-files -u two~second-rename &&
+		test_stdout_line_count = 1 git ls-files -u original &&
+		test_stdout_line_count = 0 git ls-files -o
+	else
+		test_stdout_line_count = 5 git ls-files -s &&
+		test_stdout_line_count = 3 git ls-files -u &&
+		test_stdout_line_count = 1 git ls-files -u one &&
+		test_stdout_line_count = 1 git ls-files -u two &&
+		test_stdout_line_count = 1 git ls-files -u original &&
+		test_stdout_line_count = 2 git ls-files -o
+	fi &&
 
 	test_path_is_file one/file &&
 	test_path_is_file two/file &&
@@ -612,11 +673,11 @@ test_expect_success 'check handling of differently renamed file with D/F conflic
 	git checkout -q first-rename-redo^0 &&
 	test_must_fail git merge --strategy=recursive second-rename-redo &&
 
-	test 3 -eq "$(git ls-files -u | wc -l)" &&
-	test 1 -eq "$(git ls-files -u one | wc -l)" &&
-	test 1 -eq "$(git ls-files -u two | wc -l)" &&
-	test 1 -eq "$(git ls-files -u original | wc -l)" &&
-	test 0 -eq "$(git ls-files -o | wc -l)" &&
+	test_stdout_line_count = 3 git ls-files -u &&
+	test_stdout_line_count = 1 git ls-files -u one &&
+	test_stdout_line_count = 1 git ls-files -u two &&
+	test_stdout_line_count = 1 git ls-files -u original &&
+	test_stdout_line_count = 0 git ls-files -o &&
 
 	test_path_is_file one &&
 	test_path_is_file two &&
@@ -700,7 +761,7 @@ test_expect_success 'setup avoid unnecessary update, dir->(file,nothing)' '
 	git rm -rf df &&
 	git commit -mB &&
 
-	git checkout master &&
+	git checkout main &&
 	git rm -rf df &&
 	echo bla >df &&
 	git add -A &&
@@ -708,7 +769,7 @@ test_expect_success 'setup avoid unnecessary update, dir->(file,nothing)' '
 '
 
 test_expect_success 'avoid unnecessary update, dir->(file,nothing)' '
-	git checkout -q master^0 &&
+	git checkout -q main^0 &&
 	test-tool chmtime --get -3600 df >expect &&
 	git merge side &&
 	test-tool chmtime --get df >actual &&
@@ -730,14 +791,14 @@ test_expect_success 'setup avoid unnecessary update, modify/delete' '
 	git rm -f file &&
 	git commit -m "Delete file" &&
 
-	git checkout master &&
+	git checkout main &&
 	echo bla >file &&
 	git add -A &&
 	git commit -m "Modify file"
 '
 
 test_expect_success 'avoid unnecessary update, modify/delete' '
-	git checkout -q master^0 &&
+	git checkout -q main^0 &&
 	test-tool chmtime --get -3600 file >expect &&
 	test_must_fail git merge side &&
 	test-tool chmtime --get file >actual &&
@@ -759,13 +820,13 @@ test_expect_success 'setup avoid unnecessary update, rename/add-dest' '
 	git add -A &&
 	git commit -m "Add file copy" &&
 
-	git checkout master &&
+	git checkout main &&
 	git mv file newfile &&
 	git commit -m "Rename file"
 '
 
 test_expect_success 'avoid unnecessary update, rename/add-dest' '
-	git checkout -q master^0 &&
+	git checkout -q main^0 &&
 	test-tool chmtime --get -3600 newfile >expect &&
 	git merge side &&
 	test-tool chmtime --get newfile >actual &&
@@ -794,9 +855,11 @@ test_expect_success 'setup merge of rename + small change' '
 test_expect_success 'merge rename + small change' '
 	git merge rename_branch &&
 
-	test 1 -eq $(git ls-files -s | wc -l) &&
-	test 0 -eq $(git ls-files -o | wc -l) &&
-	test $(git rev-parse HEAD:renamed_file) = $(git rev-parse HEAD~1:file)
+	test_stdout_line_count = 1 git ls-files -s &&
+	test_stdout_line_count = 0 git ls-files -o &&
+	newhash=$(git rev-parse HEAD:renamed_file) &&
+	oldhash=$(git rev-parse HEAD~1:file) &&
+	test $newhash = $oldhash
 '
 
 test_expect_success 'setup for use of extended merge markers' '
@@ -815,15 +878,15 @@ test_expect_success 'setup for use of extended merge markers' '
 	git mv original_file renamed_file &&
 	git commit -mB &&
 
-	git checkout master &&
+	git checkout main &&
 	echo 8.5 >>original_file &&
 	git add original_file &&
 	git commit -mC
 '
 
-test_expect_success 'merge master into rename has correct extended markers' '
+test_expect_success 'merge main into rename has correct extended markers' '
 	git checkout rename^0 &&
-	test_must_fail git merge -s recursive master^0 &&
+	test_must_fail git merge -s recursive main^0 &&
 
 	cat >expected <<-\EOF &&
 	1
@@ -838,14 +901,14 @@ test_expect_success 'merge master into rename has correct extended markers' '
 	9
 	=======
 	8.5
-	>>>>>>> master^0:original_file
+	>>>>>>> main^0:original_file
 	EOF
 	test_cmp expected renamed_file
 '
 
-test_expect_success 'merge rename into master has correct extended markers' '
+test_expect_success 'merge rename into main has correct extended markers' '
 	git reset --hard &&
-	git checkout master^0 &&
+	git checkout main^0 &&
 	test_must_fail git merge -s recursive rename^0 &&
 
 	cat >expected <<-\EOF &&
@@ -881,13 +944,13 @@ test_expect_success 'setup spurious "refusing to lose untracked" message' '
 	git mv original_file renamed_file &&
 	git commit -mB &&
 
-	git checkout master &&
+	git checkout main &&
 	git rm original_file &&
 	git commit -mC
 '
 
 test_expect_success 'no spurious "refusing to lose untracked" message' '
-	git checkout master^0 &&
+	git checkout main^0 &&
 	test_must_fail git merge rename^0 2>errors.txt &&
 	! grep "refusing to lose untracked file" errors.txt
 '
diff --git a/t/t6023-merge-file.sh b/t/t6403-merge-file.sh
index 2f421d9..fb872c5 100755
--- a/t/t6023-merge-file.sh
+++ b/t/t6403-merge-file.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='RCS merge replacement: merge-file'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -54,7 +56,67 @@ test_expect_success 'setup' '
 	deduxit me super semitas jusitiae,
 	EOF
 
-	printf "propter nomen suum." >>new4.txt
+	printf "propter nomen suum." >>new4.txt &&
+
+	cat >base.c <<-\EOF &&
+	int f(int x, int y)
+	{
+		if (x == 0)
+		{
+			return y;
+		}
+		return x;
+	}
+
+	int g(size_t u)
+	{
+		while (u < 30)
+		{
+			u++;
+		}
+		return u;
+	}
+	EOF
+
+	cat >ours.c <<-\EOF &&
+	int g(size_t u)
+	{
+		while (u < 30)
+		{
+			u++;
+		}
+		return u;
+	}
+
+	int h(int x, int y, int z)
+	{
+		if (z == 0)
+		{
+			return x;
+		}
+		return y;
+	}
+	EOF
+
+	cat >theirs.c <<-\EOF
+	int f(int x, int y)
+	{
+		if (x == 0)
+		{
+			return y;
+		}
+		return x;
+	}
+
+	int g(size_t u)
+	{
+		while (u > 34)
+		{
+			u--;
+		}
+		return u;
+	}
+	EOF
 '
 
 test_expect_success 'merge with no changes' '
@@ -63,11 +125,30 @@ test_expect_success 'merge with no changes' '
 	test_cmp test.txt orig.txt
 '
 
+test_expect_success 'merge with no changes with --object-id' '
+	git add orig.txt &&
+	git merge-file -p --object-id :orig.txt :orig.txt :orig.txt >actual &&
+	test_cmp actual orig.txt
+'
+
 test_expect_success "merge without conflict" '
 	cp new1.txt test.txt &&
 	git merge-file test.txt orig.txt new2.txt
 '
 
+test_expect_success 'merge without conflict with --object-id' '
+	git add orig.txt new2.txt &&
+	git merge-file --object-id :orig.txt :orig.txt :new2.txt >actual &&
+	git rev-parse :new2.txt >expected &&
+	test_cmp actual expected
+'
+
+test_expect_success 'can accept object ID with --object-id' '
+	git merge-file --object-id $(test_oid empty_blob) $(test_oid empty_blob) :new2.txt >actual &&
+	git rev-parse :new2.txt >expected &&
+	test_cmp actual expected
+'
+
 test_expect_success 'works in subdirectory' '
 	mkdir dir &&
 	cp new1.txt dir/a.txt &&
@@ -136,6 +217,31 @@ test_expect_success "expected conflict markers" '
 	test_cmp expect.txt test.txt
 '
 
+test_expect_success "merge with conflicts with --object-id" '
+	git add backup.txt orig.txt new3.txt &&
+	test_must_fail git merge-file -p --object-id :backup.txt :orig.txt :new3.txt >actual &&
+	sed -e "s/<< test.txt/<< :backup.txt/" \
+	    -e "s/>> new3.txt/>> :new3.txt/" \
+	    expect.txt >expect &&
+	test_cmp expect actual &&
+	test_must_fail git merge-file --object-id :backup.txt :orig.txt :new3.txt >oid &&
+	git cat-file blob "$(cat oid)" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success "merge with conflicts with --object-id with labels" '
+	git add backup.txt orig.txt new3.txt &&
+	test_must_fail git merge-file -p --object-id \
+		-L test.txt -L orig.txt -L new3.txt \
+		:backup.txt :orig.txt :new3.txt >actual &&
+	test_cmp expect.txt actual &&
+	test_must_fail git merge-file --object-id \
+		-L test.txt -L orig.txt -L new3.txt \
+		:backup.txt :orig.txt :new3.txt >oid &&
+	git cat-file blob "$(cat oid)" >actual &&
+	test_cmp expect.txt actual
+'
+
 test_expect_success "merge conflicting with --ours" '
 	cp backup.txt test.txt &&
 
@@ -254,6 +360,14 @@ test_expect_success 'binary files cannot be merged' '
 	grep "Cannot merge binary files" merge.err
 '
 
+test_expect_success 'binary files cannot be merged with --object-id' '
+	cp "$TEST_DIRECTORY"/test-binary-1.png . &&
+	git add orig.txt new1.txt test-binary-1.png &&
+	test_must_fail git merge-file --object-id \
+		:orig.txt :test-binary-1.png :new1.txt 2> merge.err &&
+	grep "Cannot merge binary files" merge.err
+'
+
 test_expect_success 'MERGE_ZEALOUS simplifies non-conflicts' '
 	sed -e "s/deerit.\$/deerit;/" -e "s/me;\$/me./" <new5.txt >new6.txt &&
 	sed -e "s/deerit.\$/deerit,/" -e "s/me;\$/me,/" <new5.txt >new7.txt &&
@@ -387,4 +501,72 @@ test_expect_success 'conflict sections match existing line endings' '
 	test $(tr "\015" Q <nolf.txt | grep "^[<=>].*Q$" | wc -l) = 0
 '
 
+test_expect_success '--object-id fails without repository' '
+	empty="$(test_oid empty_blob)" &&
+	nongit test_must_fail git merge-file --object-id $empty $empty $empty 2>err &&
+	grep "not a git repository" err
+'
+
+test_expect_success 'merging C files with "myers" diff algorithm creates some spurious conflicts' '
+	cat >expect.c <<-\EOF &&
+	int g(size_t u)
+	{
+		while (u < 30)
+		{
+			u++;
+		}
+		return u;
+	}
+
+	int h(int x, int y, int z)
+	{
+	<<<<<<< ours.c
+		if (z == 0)
+	||||||| base.c
+		while (u < 30)
+	=======
+		while (u > 34)
+	>>>>>>> theirs.c
+		{
+	<<<<<<< ours.c
+			return x;
+	||||||| base.c
+			u++;
+	=======
+			u--;
+	>>>>>>> theirs.c
+		}
+		return y;
+	}
+	EOF
+
+	test_must_fail git merge-file -p --diff3 --diff-algorithm myers ours.c base.c theirs.c >myers_output.c &&
+	test_cmp expect.c myers_output.c
+'
+
+test_expect_success 'merging C files with "histogram" diff algorithm avoids some spurious conflicts' '
+	cat >expect.c <<-\EOF &&
+	int g(size_t u)
+	{
+		while (u > 34)
+		{
+			u--;
+		}
+		return u;
+	}
+
+	int h(int x, int y, int z)
+	{
+		if (z == 0)
+		{
+			return x;
+		}
+		return y;
+	}
+	EOF
+
+	git merge-file -p --diff3 --diff-algorithm histogram ours.c base.c theirs.c >histogram_output.c &&
+	test_cmp expect.c histogram_output.c
+'
+
 test_done
diff --git a/t/t6024-recursive-merge.sh b/t/t6404-recursive-merge.sh
index 332cfc5..3621551 100755
--- a/t/t6024-recursive-merge.sh
+++ b/t/t6404-recursive-merge.sh
@@ -1,6 +1,10 @@
 #!/bin/sh
 
 test_description='Test merge without common ancestors'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # This scenario is based on a real-world repository of Shawn Pearce.
@@ -15,15 +19,17 @@ GIT_COMMITTER_DATE="2006-12-12 23:28:00 +0100"
 export GIT_COMMITTER_DATE
 
 test_expect_success 'setup tests' '
+	GIT_TEST_COMMIT_GRAPH=0 &&
+	export GIT_TEST_COMMIT_GRAPH &&
 	echo 1 >a1 &&
 	git add a1 &&
 	GIT_AUTHOR_DATE="2006-12-12 23:00:00" git commit -m 1 a1 &&
 
-	git checkout -b A master &&
+	git checkout -b A main &&
 	echo A >a1 &&
 	GIT_AUTHOR_DATE="2006-12-12 23:00:01" git commit -m A a1 &&
 
-	git checkout -b B master &&
+	git checkout -b B main &&
 	echo B >a1 &&
 	GIT_AUTHOR_DATE="2006-12-12 23:00:02" git commit -m B a1 &&
 
@@ -66,7 +72,7 @@ test_expect_success 'setup tests' '
 '
 
 test_expect_success 'combined merge conflicts' '
-	test_must_fail env GIT_TEST_COMMIT_GRAPH=0 git merge -m final G
+	test_must_fail git merge -m final G
 '
 
 test_expect_success 'result contains a conflict' '
@@ -82,6 +88,7 @@ test_expect_success 'result contains a conflict' '
 '
 
 test_expect_success 'virtual trees were processed' '
+	# TODO: fragile test, relies on ambigious merge-base resolution
 	git ls-files --stage >out &&
 
 	cat >expect <<-EOF &&
@@ -102,8 +109,13 @@ test_expect_success 'refuse to merge binary files' '
 	printf "\0\0" >binary-file &&
 	git add binary-file &&
 	git commit -m binary2 &&
-	test_must_fail git merge F >merge.out 2>merge.err &&
-	grep "Cannot merge binary files: binary-file (HEAD vs. F)" merge.err
+	if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+	then
+		test_must_fail git merge F >merge_output
+	else
+		test_must_fail git merge F 2>merge_output
+	fi &&
+	grep "Cannot merge binary files: binary-file (HEAD vs. F)" merge_output
 '
 
 test_expect_success 'mark rename/delete as unmerged' '
@@ -118,12 +130,22 @@ test_expect_success 'mark rename/delete as unmerged' '
 	test_tick &&
 	git commit -m rename &&
 	test_must_fail git merge delete &&
-	test 1 = $(git ls-files --unmerged | wc -l) &&
+	if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+	then
+		test 2 = $(git ls-files --unmerged | wc -l)
+	else
+		test 1 = $(git ls-files --unmerged | wc -l)
+	fi &&
 	git rev-parse --verify :2:a2 &&
 	test_must_fail git rev-parse --verify :3:a2 &&
 	git checkout -f delete &&
 	test_must_fail git merge rename &&
-	test 1 = $(git ls-files --unmerged | wc -l) &&
+	if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+	then
+		test 2 = $(git ls-files --unmerged | wc -l)
+	else
+		test 1 = $(git ls-files --unmerged | wc -l)
+	fi &&
 	test_must_fail git rev-parse --verify :2:a2 &&
 	git rev-parse --verify :3:a2
 '
diff --git a/t/t6025-merge-symlinks.sh b/t/t6405-merge-symlinks.sh
index 6c0a90d..29e2b25 100755
--- a/t/t6025-merge-symlinks.sh
+++ b/t/t6405-merge-symlinks.sh
@@ -8,6 +8,10 @@ test_description='merging symlinks on filesystem w/o symlink support.
 This tests that git merge-recursive writes merge results as plain files
 if core.symlinks is false.'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -19,7 +23,7 @@ test_expect_success 'setup' '
 	git branch b-file &&
 	l=$(printf file | git hash-object -t blob -w --stdin) &&
 	echo "120000 $l	symlink" | git update-index --index-info &&
-	git commit -m master &&
+	git commit -m main &&
 	git checkout b-symlink &&
 	l=$(printf file-different | git hash-object -t blob -w --stdin) &&
 	echo "120000 $l	symlink" | git update-index --index-info &&
@@ -30,28 +34,28 @@ test_expect_success 'setup' '
 	git commit -m b-file
 '
 
-test_expect_success 'merge master into b-symlink, which has a different symbolic link' '
+test_expect_success 'merge main into b-symlink, which has a different symbolic link' '
 	git checkout b-symlink &&
-	test_must_fail git merge master
+	test_must_fail git merge main
 '
 
 test_expect_success 'the merge result must be a file' '
 	test_path_is_file symlink
 '
 
-test_expect_success 'merge master into b-file, which has a file instead of a symbolic link' '
+test_expect_success 'merge main into b-file, which has a file instead of a symbolic link' '
 	git reset --hard &&
 	git checkout b-file &&
-	test_must_fail git merge master
+	test_must_fail git merge main
 '
 
 test_expect_success 'the merge result must be a file' '
 	test_path_is_file symlink
 '
 
-test_expect_success 'merge b-file, which has a file instead of a symbolic link, into master' '
+test_expect_success 'merge b-file, which has a file instead of a symbolic link, into main' '
 	git reset --hard &&
-	git checkout master &&
+	git checkout main &&
 	test_must_fail git merge b-file
 '
 
diff --git a/t/t6026-merge-attr.sh b/t/t6406-merge-attr.sh
index 76a55f8..156a1ef 100755
--- a/t/t6026-merge-attr.sh
+++ b/t/t6406-merge-attr.sh
@@ -5,6 +5,10 @@
 
 test_description='per path merge controlled by merge attribute'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -19,10 +23,10 @@ test_expect_success setup '
 	git branch side &&
 	for f in text binary union
 	do
-		echo Master >>$f && git add $f || return 1
+		echo Main >>$f && git add $f || return 1
 	done &&
 	test_tick &&
-	git commit -m Master &&
+	git commit -m Main &&
 
 	git checkout side &&
 	for f in text binary union
@@ -38,11 +42,15 @@ test_expect_success setup '
 	#!/bin/sh
 
 	orig="$1" ours="$2" theirs="$3" exit="$4" path=$5
+	orig_name="$6" our_name="$7" their_name="$8"
 	(
 		echo "orig is $orig"
 		echo "ours is $ours"
 		echo "theirs is $theirs"
 		echo "path is $path"
+		echo "orig_name is $orig_name"
+		echo "our_name is $our_name"
+		echo "their_name is $their_name"
 		echo "=== orig ==="
 		cat "$orig"
 		echo "=== ours ==="
@@ -52,6 +60,12 @@ test_expect_success setup '
 	) >"$ours+"
 	cat "$ours+" >"$ours"
 	rm -f "$ours+"
+
+	if test -f ./please-abort
+	then
+		echo >>./please-abort killing myself
+		kill -9 $$
+	fi
 	exit "$exit"
 	EOF
 	chmod +x ./custom-merge
@@ -59,12 +73,12 @@ test_expect_success setup '
 
 test_expect_success merge '
 
-	{
-		echo "binary -merge"
-		echo "union merge=union"
-	} >.gitattributes &&
+	cat >.gitattributes <<-\EOF &&
+	binary -merge
+	union merge=union
+	EOF
 
-	if git merge master
+	if git merge main
 	then
 		echo Gaah, should have conflicted
 		false
@@ -87,7 +101,7 @@ test_expect_success 'check merge result in working tree' '
 	grep "<<<<<<<" text &&
 	cmp binary-orig binary &&
 	! grep "<<<<<<<" union &&
-	grep Master union &&
+	grep Main union &&
 	grep Side union
 
 '
@@ -111,18 +125,19 @@ test_expect_success 'custom merge backend' '
 
 	git reset --hard anchor &&
 	git config --replace-all \
-	merge.custom.driver "./custom-merge %O %A %B 0 %P" &&
+	merge.custom.driver "./custom-merge %O %A %B 0 %P %S %X %Y" &&
 	git config --replace-all \
 	merge.custom.name "custom merge driver for testing" &&
 
-	git merge master &&
+	git merge main &&
 
 	cmp binary union &&
 	sed -e 1,3d text >check-1 &&
-	o=$(git unpack-file master^:text) &&
+	o=$(git unpack-file main^:text) &&
 	a=$(git unpack-file side^:text) &&
-	b=$(git unpack-file master:text) &&
-	sh -c "./custom-merge $o $a $b 0 text" &&
+	b=$(git unpack-file main:text) &&
+	base_revid=$(git rev-parse --short main^) &&
+	sh -c "./custom-merge $o $a $b 0 text $base_revid HEAD main" &&
 	sed -e 1,3d $a >check-2 &&
 	cmp check-1 check-2 &&
 	rm -f $o $a $b
@@ -132,11 +147,11 @@ test_expect_success 'custom merge backend' '
 
 	git reset --hard anchor &&
 	git config --replace-all \
-	merge.custom.driver "./custom-merge %O %A %B 1 %P" &&
+	merge.custom.driver "./custom-merge %O %A %B 1 %P %S %X %Y" &&
 	git config --replace-all \
 	merge.custom.name "custom merge driver for testing" &&
 
-	if git merge master
+	if git merge main
 	then
 		echo "Eh? should have conflicted"
 		false
@@ -146,10 +161,11 @@ test_expect_success 'custom merge backend' '
 
 	cmp binary union &&
 	sed -e 1,3d text >check-1 &&
-	o=$(git unpack-file master^:text) &&
+	o=$(git unpack-file main^:text) &&
 	a=$(git unpack-file anchor:text) &&
-	b=$(git unpack-file master:text) &&
-	sh -c "./custom-merge $o $a $b 0 text" &&
+	b=$(git unpack-file main:text) &&
+	base_revid=$(git rev-parse --short main^) &&
+	sh -c "./custom-merge $o $a $b 0 text $base_revid HEAD main" &&
 	sed -e 1,3d $a >check-2 &&
 	cmp check-1 check-2 &&
 	sed -e 1,3d -e 4q $a >check-3 &&
@@ -158,9 +174,27 @@ test_expect_success 'custom merge backend' '
 	rm -f $o $a $b
 '
 
+test_expect_success !WINDOWS 'custom merge driver that is killed with a signal' '
+	test_when_finished "rm -f output please-abort" &&
+
+	git reset --hard anchor &&
+	git config --replace-all \
+	merge.custom.driver "./custom-merge %O %A %B 0 %P %S %X %Y" &&
+	git config --replace-all \
+	merge.custom.name "custom merge driver for testing" &&
+
+	>./please-abort &&
+	echo "* merge=custom" >.gitattributes &&
+	test_must_fail git merge main 2>err &&
+	grep "^error: failed to execute internal merge" err &&
+	git ls-files -u >output &&
+	git diff --name-only HEAD >>output &&
+	test_must_be_empty output
+'
+
 test_expect_success 'up-to-date merge without common ancestor' '
-	test_create_repo repo1 &&
-	test_create_repo repo2 &&
+	git init repo1 &&
+	git init repo2 &&
 	test_tick &&
 	(
 		cd repo1 &&
@@ -176,7 +210,7 @@ test_expect_success 'up-to-date merge without common ancestor' '
 	test_tick &&
 	(
 		cd repo1 &&
-		git fetch ../repo2 master &&
+		git fetch ../repo2 main &&
 		git merge --allow-unrelated-histories FETCH_HEAD
 	)
 '
@@ -201,7 +235,30 @@ test_expect_success 'custom merge does not lock index' '
 	# By packaging the command in test_when_finished, we get both
 	# the correctness check and the clean-up.
 	test_when_finished "kill \$(cat sleep.pid)" &&
-	git merge master
+	git merge main
+'
+
+test_expect_success 'binary files with union attribute' '
+	git checkout -b bin-main &&
+	printf "base\0" >bin.txt &&
+	echo "bin.txt merge=union" >.gitattributes &&
+	git add bin.txt .gitattributes &&
+	git commit -m base &&
+
+	printf "one\0" >bin.txt &&
+	git commit -am one &&
+
+	git checkout -b bin-side HEAD^ &&
+	printf "two\0" >bin.txt &&
+	git commit -am two &&
+
+	if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+	then
+		test_must_fail git merge bin-main >output
+	else
+		test_must_fail git merge bin-main 2>output
+	fi &&
+	grep -i "warning.*cannot merge.*HEAD vs. bin-main" output
 '
 
 test_done
diff --git a/t/t6027-merge-binary.sh b/t/t6407-merge-binary.sh
index 4e6c7cb..0753fc9 100755
--- a/t/t6027-merge-binary.sh
+++ b/t/t6407-merge-binary.sh
@@ -2,6 +2,10 @@
 
 test_description='ask merge-recursive to merge binary files'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -20,7 +24,7 @@ test_expect_success setup '
 	git ls-files -s a >E0 &&
 	git ls-files -s m | sed -e "s/ 0	/ 3	/" >E3 &&
 	test_tick &&
-	git commit -m "master adds some" &&
+	git commit -m "main adds some" &&
 
 	git checkout side &&
 	echo rezrov >>m &&
@@ -39,14 +43,9 @@ test_expect_success resolve '
 	rm -f a* m* &&
 	git reset --hard anchor &&
 
-	if git merge -s resolve master
-	then
-		echo Oops, should not have succeeded
-		false
-	else
-		git ls-files -s >current
-		test_cmp expect current
-	fi
+	test_must_fail git merge -s resolve main &&
+	git ls-files -s >current &&
+	test_cmp expect current
 '
 
 test_expect_success recursive '
@@ -54,14 +53,9 @@ test_expect_success recursive '
 	rm -f a* m* &&
 	git reset --hard anchor &&
 
-	if git merge -s recursive master
-	then
-		echo Oops, should not have succeeded
-		false
-	else
-		git ls-files -s >current
-		test_cmp expect current
-	fi
+	test_must_fail git merge -s recursive main &&
+	git ls-files -s >current &&
+	test_cmp expect current
 '
 
 test_done
diff --git a/t/t6028-merge-up-to-date.sh b/t/t6408-merge-up-to-date.sh
index 7763c1b..8a1ba6d 100755
--- a/t/t6028-merge-up-to-date.sh
+++ b/t/t6408-merge-up-to-date.sh
@@ -2,6 +2,7 @@
 
 test_description='merge fast-forward and up to date'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
diff --git a/t/t6029-merge-subtree.sh b/t/t6409-merge-subtree.sh
index 793f0c8..e9ba6f1 100755
--- a/t/t6029-merge-subtree.sh
+++ b/t/t6409-merge-subtree.sh
@@ -2,29 +2,32 @@
 
 test_description='subtree merge strategy'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 test_expect_success setup '
 
 	s="1 2 3 4 5 6 7 8" &&
-	for i in $s; do echo $i; done >hello &&
+	test_write_lines $s >hello &&
 	git add hello &&
 	git commit -m initial &&
 	git checkout -b side &&
 	echo >>hello world &&
 	git add hello &&
 	git commit -m second &&
-	git checkout master &&
-	for i in mundo $s; do echo $i; done >hello &&
+	git checkout main &&
+	test_write_lines mundo $s >hello &&
 	git add hello &&
-	git commit -m master
+	git commit -m main
 
 '
 
 test_expect_success 'subtree available and works like recursive' '
 
 	git merge -s subtree side &&
-	for i in mundo $s world; do echo $i; done >expect &&
+	test_write_lines mundo $s world >expect &&
 	test_cmp expect hello
 
 '
@@ -35,11 +38,11 @@ test_expect_success 'setup branch sub' '
 	test_commit foo
 '
 
-test_expect_success 'setup branch main' '
-	git checkout -b main master &&
+test_expect_success 'setup topic branch' '
+	git checkout -b topic main &&
 	git merge -s ours --no-commit --allow-unrelated-histories sub &&
 	git read-tree --prefix=dir/ -u sub &&
-	git commit -m "initial merge of sub into main" &&
+	git commit -m "initial merge of sub into topic" &&
 	test_path_is_file dir/foo.t &&
 	test_path_is_file hello
 '
@@ -49,9 +52,9 @@ test_expect_success 'update branch sub' '
 	test_commit bar
 '
 
-test_expect_success 'update branch main' '
-	git checkout main &&
-	git merge -s subtree sub -m "second merge of sub into main" &&
+test_expect_success 'update topic branch' '
+	git checkout topic &&
+	git merge -s subtree sub -m "second merge of sub into topic" &&
 	test_path_is_file dir/bar.t &&
 	test_path_is_file dir/foo.t &&
 	test_path_is_file hello
@@ -77,8 +80,8 @@ test_expect_success 'setup' '
 
 test_expect_success 'initial merge' '
 	git remote add -f gui ../git-gui &&
-	git merge -s ours --no-commit --allow-unrelated-histories gui/master &&
-	git read-tree --prefix=git-gui/ -u gui/master &&
+	git merge -s ours --no-commit --allow-unrelated-histories gui/main &&
+	git read-tree --prefix=git-gui/ -u gui/main &&
 	git commit -m "Merge git-gui as our subdirectory" &&
 	git checkout -b work &&
 	git ls-files -s >actual &&
@@ -94,10 +97,10 @@ test_expect_success 'merge update' '
 	echo git-gui2 > git-gui.sh &&
 	o3=$(git hash-object git-gui.sh) &&
 	git add git-gui.sh &&
-	git checkout -b master2 &&
+	git checkout -b topic_2 &&
 	git commit -m "update git-gui" &&
 	cd ../git &&
-	git pull -s subtree gui master2 &&
+	git pull --no-rebase -s subtree gui topic_2 &&
 	git ls-files -s >actual &&
 	(
 		echo "100644 $o3 0	git-gui/git-gui.sh" &&
@@ -108,10 +111,10 @@ test_expect_success 'merge update' '
 
 test_expect_success 'initial ambiguous subtree' '
 	cd ../git &&
-	git reset --hard master &&
-	git checkout -b master2 &&
-	git merge -s ours --no-commit gui/master &&
-	git read-tree --prefix=git-gui2/ -u gui/master &&
+	git reset --hard main &&
+	git checkout -b topic_2 &&
+	git merge -s ours --no-commit gui/main &&
+	git read-tree --prefix=git-gui2/ -u gui/main &&
 	git commit -m "Merge git-gui2 as our subdirectory" &&
 	git checkout -b work2 &&
 	git ls-files -s >actual &&
@@ -125,8 +128,8 @@ test_expect_success 'initial ambiguous subtree' '
 
 test_expect_success 'merge using explicit' '
 	cd ../git &&
-	git reset --hard master2 &&
-	git pull -Xsubtree=git-gui gui master2 &&
+	git reset --hard topic_2 &&
+	git pull --no-rebase -Xsubtree=git-gui gui topic_2 &&
 	git ls-files -s >actual &&
 	(
 		echo "100644 $o3 0	git-gui/git-gui.sh" &&
@@ -138,8 +141,8 @@ test_expect_success 'merge using explicit' '
 
 test_expect_success 'merge2 using explicit' '
 	cd ../git &&
-	git reset --hard master2 &&
-	git pull -Xsubtree=git-gui2 gui master2 &&
+	git reset --hard topic_2 &&
+	git pull --no-rebase -Xsubtree=git-gui2 gui topic_2 &&
 	git ls-files -s >actual &&
 	(
 		echo "100644 $o1 0	git-gui/git-gui.sh" &&
diff --git a/t/t6031-merge-filemode.sh b/t/t6411-merge-filemode.sh
index 87741ef..b618272 100755
--- a/t/t6031-merge-filemode.sh
+++ b/t/t6411-merge-filemode.sh
@@ -1,17 +1,21 @@
 #!/bin/sh
 
 test_description='merge: handle file mode'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'set up mode change in one branch' '
 	: >file1 &&
 	git add file1 &&
 	git commit -m initial &&
-	git checkout -b a1 master &&
+	git checkout -b a1 main &&
 	: >dummy &&
 	git add dummy &&
 	git commit -m a &&
-	git checkout -b b1 master &&
+	git checkout -b b1 main &&
 	test_chmod +x file1 &&
 	git add file1 &&
 	git commit -m b1
@@ -39,19 +43,19 @@ do_one_mode resolve b1 a1
 
 test_expect_success 'set up mode change in both branches' '
 	git reset --hard HEAD &&
-	git checkout -b a2 master &&
+	git checkout -b a2 main &&
 	: >file2 &&
 	H=$(git hash-object file2) &&
 	test_chmod +x file2 &&
 	git commit -m a2 &&
-	git checkout -b b2 master &&
+	git checkout -b b2 main &&
 	: >file2 &&
 	git add file2 &&
 	git commit -m b2 &&
-	{
-		echo "100755 $H 2	file2"
-		echo "100644 $H 3	file2"
-	} >expect
+	cat >expect <<-EOF
+	100755 $H 2	file2
+	100644 $H 3	file2
+	EOF
 '
 
 do_both_modes () {
@@ -76,7 +80,7 @@ do_both_modes resolve
 
 test_expect_success 'set up delete/modechange scenario' '
 	git reset --hard &&
-	git checkout -b deletion master &&
+	git checkout -b deletion main &&
 	git rm file1 &&
 	git commit -m deletion
 '
diff --git a/t/t6032-merge-large-rename.sh b/t/t6412-merge-large-rename.sh
index 8077738..ca018d1 100755
--- a/t/t6032-merge-large-rename.sh
+++ b/t/t6412-merge-large-rename.sh
@@ -1,6 +1,9 @@
 #!/bin/sh
 
 test_description='merging with large rename matrix'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 count() {
@@ -30,28 +33,28 @@ test_rename() {
 	test_expect_success "rename ($1, $2)" '
 	n='$1' &&
 	expect='$2' &&
-	git checkout -f master &&
+	git checkout -f main &&
 	test_might_fail git branch -D test$n &&
 	git reset --hard initial &&
 	for i in $(count $n); do
-		make_text $i initial initial >$i
+		make_text $i initial initial >$i || return 1
 	done &&
 	git add . &&
 	git commit -m add=$n &&
 	for i in $(count $n); do
-		make_text $i changed initial >$i
+		make_text $i changed initial >$i || return 1
 	done &&
 	git commit -a -m change=$n &&
 	git checkout -b test$n HEAD^ &&
 	for i in $(count $n); do
-		git rm $i
-		make_text $i initial changed >$i.moved
+		git rm $i &&
+		make_text $i initial changed >$i.moved || return 1
 	done &&
 	git add . &&
 	git commit -m change+rename=$n &&
 	case "$expect" in
-		ok) git merge master ;;
-		 *) test_must_fail git merge master ;;
+		ok) git merge main ;;
+		 *) test_must_fail git merge main ;;
 	esac
 	'
 }
@@ -76,7 +79,7 @@ test_expect_success 'setup large simple rename' '
 
 	git reset --hard initial &&
 	for i in $(count 200); do
-		make_text foo bar baz >$i
+		make_text foo bar baz >$i || return 1
 	done &&
 	git add . &&
 	git commit -m create-files &&
diff --git a/t/t6033-merge-crlf.sh b/t/t6413-merge-crlf.sh
index e8d65ee..647ea1e 100755
--- a/t/t6033-merge-crlf.sh
+++ b/t/t6413-merge-crlf.sh
@@ -8,6 +8,10 @@ test_description='merge conflict in crlf repo
 
 '
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -24,20 +28,20 @@ test_expect_success setup '
 	echo line from b | append_cr >file &&
 	git commit -m "add line from b" file &&
 	git tag b &&
-	git checkout master
+	git checkout main
 '
 
 test_expect_success 'Check "ours" is CRLF' '
 	git reset --hard initial &&
 	git merge side -s ours &&
-	cat file | remove_cr | append_cr >file.temp &&
+	remove_cr <file | append_cr >file.temp &&
 	test_cmp file file.temp
 '
 
 test_expect_success 'Check that conflict file is CRLF' '
 	git reset --hard a &&
 	test_must_fail git merge side &&
-	cat file | remove_cr | append_cr >file.temp &&
+	remove_cr <file | append_cr >file.temp &&
 	test_cmp file file.temp
 '
 
diff --git a/t/t6034-merge-rename-nocruft.sh b/t/t6414-merge-rename-nocruft.sh
index a25e730..69fc1c9 100755
--- a/t/t6034-merge-rename-nocruft.sh
+++ b/t/t6414-merge-rename-nocruft.sh
@@ -1,6 +1,10 @@
 #!/bin/sh
 
 test_description='Merge-recursive merging renames'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -65,7 +69,7 @@ test_expect_success 'setup' '
 	git update-index A &&
 	git commit -m "blue modify A" &&
 
-	git checkout master
+	git checkout main
 '
 
 # This test broke in 65ac6e9c3f47807cb603af07a6a9e1a43bc119ae
diff --git a/t/t6035-merge-dir-to-symlink.sh b/t/t6415-merge-dir-to-symlink.sh
index 2eddcc7..ae00492 100755
--- a/t/t6035-merge-dir-to-symlink.sh
+++ b/t/t6415-merge-dir-to-symlink.sh
@@ -1,6 +1,10 @@
 #!/bin/sh
 
 test_description='merging when a directory was replaced with a symlink'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'create a commit where dir a/b changed to symlink' '
@@ -19,24 +23,26 @@ test_expect_success 'create a commit where dir a/b changed to symlink' '
 
 test_expect_success 'checkout does not clobber untracked symlink' '
 	git checkout HEAD^0 &&
-	git reset --hard master &&
+	git reset --hard main &&
 	git rm --cached a/b &&
 	git commit -m "untracked symlink remains" &&
-	test_must_fail git checkout start^0
+	test_must_fail git checkout start^0 &&
+	git clean -fd    # Do not leave the untracked symlink in the way
 '
 
 test_expect_success 'a/b-2/c/d is kept when clobbering symlink b' '
 	git checkout HEAD^0 &&
-	git reset --hard master &&
+	git reset --hard main &&
 	git rm --cached a/b &&
 	git commit -m "untracked symlink remains" &&
 	git checkout -f start^0 &&
-	test_path_is_file a/b-2/c/d
+	test_path_is_file a/b-2/c/d &&
+	git clean -fd    # Do not leave the untracked symlink in the way
 '
 
 test_expect_success 'checkout should not have deleted a/b-2/c/d' '
 	git checkout HEAD^0 &&
-	git reset --hard master &&
+	git reset --hard main &&
 	 git checkout start^0 &&
 	 test_path_is_file a/b-2/c/d
 '
@@ -53,7 +59,7 @@ test_expect_success 'setup for merge test' '
 test_expect_success 'Handle D/F conflict, do not lose a/b-2/c/d in merge (resolve)' '
 	git reset --hard &&
 	git checkout baseline^0 &&
-	git merge -s resolve master &&
+	git merge -s resolve main &&
 	test_path_is_file a/b-2/c/d
 '
 
@@ -64,7 +70,7 @@ test_expect_success SYMLINKS 'a/b was resolved as symlink' '
 test_expect_success 'Handle D/F conflict, do not lose a/b-2/c/d in merge (recursive)' '
 	git reset --hard &&
 	git checkout baseline^0 &&
-	git merge -s recursive master &&
+	git merge -s recursive main &&
 	test_path_is_file a/b-2/c/d
 '
 
@@ -74,7 +80,7 @@ test_expect_success SYMLINKS 'a/b was resolved as symlink' '
 
 test_expect_success 'Handle F/D conflict, do not lose a/b-2/c/d in merge (resolve)' '
 	git reset --hard &&
-	git checkout master^0 &&
+	git checkout main^0 &&
 	git merge -s resolve baseline^0 &&
 	test_path_is_file a/b-2/c/d
 '
@@ -85,7 +91,7 @@ test_expect_success SYMLINKS 'a/b was resolved as symlink' '
 
 test_expect_success 'Handle F/D conflict, do not lose a/b-2/c/d in merge (recursive)' '
 	git reset --hard &&
-	git checkout master^0 &&
+	git checkout main^0 &&
 	git merge -s recursive baseline^0 &&
 	test_path_is_file a/b-2/c/d
 '
@@ -98,7 +104,7 @@ test_expect_failure 'do not lose untracked in merge (resolve)' '
 	git reset --hard &&
 	git checkout baseline^0 &&
 	>a/b/c/e &&
-	test_must_fail git merge -s resolve master &&
+	test_must_fail git merge -s resolve main &&
 	test_path_is_file a/b/c/e &&
 	test_path_is_file a/b-2/c/d
 '
@@ -107,7 +113,7 @@ test_expect_success 'do not lose untracked in merge (recursive)' '
 	git reset --hard &&
 	git checkout baseline^0 &&
 	>a/b/c/e &&
-	test_must_fail git merge -s recursive master &&
+	test_must_fail git merge -s recursive main &&
 	test_path_is_file a/b/c/e &&
 	test_path_is_file a/b-2/c/d
 '
@@ -116,14 +122,14 @@ test_expect_success 'do not lose modifications in merge (resolve)' '
 	git reset --hard &&
 	git checkout baseline^0 &&
 	echo more content >>a/b/c/d &&
-	test_must_fail git merge -s resolve master
+	test_must_fail git merge -s resolve main
 '
 
 test_expect_success 'do not lose modifications in merge (recursive)' '
 	git reset --hard &&
 	git checkout baseline^0 &&
 	echo more content >>a/b/c/d &&
-	test_must_fail git merge -s recursive master
+	test_must_fail git merge -s recursive main
 '
 
 test_expect_success 'setup a merge where dir a/b-2 changed to symlink' '
diff --git a/t/t6036-recursive-corner-cases.sh b/t/t6416-recursive-corner-cases.sh
index b3bf462..5f414ab 100755
--- a/t/t6036-recursive-corner-cases.sh
+++ b/t/t6416-recursive-corner-cases.sh
@@ -2,7 +2,12 @@
 
 test_description='recursive merge corner cases involving criss-cross merges'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-merge.sh
 
 #
 #  L1  L2
@@ -15,19 +20,13 @@ test_description='recursive merge corner cases involving criss-cross merges'
 #
 
 test_expect_success 'setup basic criss-cross + rename with no modifications' '
-	test_create_repo basic-rename &&
+	git init basic-rename &&
 	(
 		cd basic-rename &&
 
 		ten="0 1 2 3 4 5 6 7 8 9" &&
-		for i in $ten
-		do
-			echo line $i in a sample file
-		done >one &&
-		for i in $ten
-		do
-			echo line $i in another sample file
-		done >two &&
+		printf "line %d in a sample file\n" $ten >one &&
+		printf "line %d in another sample file\n" $ten >two &&
 		git add one two &&
 		test_tick && git commit -m initial &&
 
@@ -87,19 +86,13 @@ test_expect_success 'merge simple rename+criss-cross with no modifications' '
 #
 
 test_expect_success 'setup criss-cross + rename merges with basic modification' '
-	test_create_repo rename-modify &&
+	git init rename-modify &&
 	(
 		cd rename-modify &&
 
 		ten="0 1 2 3 4 5 6 7 8 9" &&
-		for i in $ten
-		do
-			echo line $i in a sample file
-		done >one &&
-		for i in $ten
-		do
-			echo line $i in another sample file
-		done >two &&
+		printf "line %d in a sample file\n" $ten >one &&
+		printf "line %d in another sample file\n" $ten >two &&
 		git add one two &&
 		test_tick && git commit -m initial &&
 
@@ -168,7 +161,7 @@ test_expect_success 'merge criss-cross + rename merges with basic modification'
 #
 
 test_expect_success 'setup differently handled merges of rename/add conflict' '
-	test_create_repo rename-add &&
+	git init rename-add &&
 	(
 		cd rename-add &&
 
@@ -332,7 +325,7 @@ test_expect_success 'git detects differently handled merges conflict, swapped' '
 # Merging commits D & E should result in modify/delete conflict.
 
 test_expect_success 'setup criss-cross + modify/delete resolved differently' '
-	test_create_repo modify-delete &&
+	git init modify-delete &&
 	(
 		cd modify-delete &&
 
@@ -384,7 +377,7 @@ test_expect_success 'git detects conflict merging criss-cross+modify/delete' '
 		test_line_count = 2 out &&
 
 		git rev-parse >expect       \
-			master:file  B:file &&
+			main:file    B:file &&
 		git rev-parse   >actual      \
 			:1:file      :2:file &&
 		test_cmp expect actual
@@ -406,7 +399,7 @@ test_expect_success 'git detects conflict merging criss-cross+modify/delete, rev
 		test_line_count = 2 out &&
 
 		git rev-parse >expect       \
-			master:file  B:file &&
+			main:file    B:file &&
 		git rev-parse   >actual      \
 			:1:file      :3:file &&
 		test_cmp expect actual
@@ -452,7 +445,7 @@ test_expect_success 'git detects conflict merging criss-cross+modify/delete, rev
 #
 # So choice 5 at least provides some kind of conflict for the original case,
 # and can merge cleanly as expected with D1 and E3.  It also made things just
-# slightly funny for merging D1 and e$, where E4 is defined as:
+# slightly funny for merging D1 and E4, where E4 is defined as:
 #   Commit E4: Merge B & C, modifying 'a' and renaming to 'a2', and deleting 'a/'
 # in this case, we'll get a rename/rename(1to2) conflict because a~$UNIQUE
 # gets renamed to 'a' in D1 and to 'a2' in E4.  But that's better than having
@@ -507,7 +500,7 @@ test_expect_success 'git detects conflict merging criss-cross+modify/delete, rev
 #
 
 test_expect_success 'setup differently handled merges of directory/file conflict' '
-	test_create_repo directory-file &&
+	git init directory-file &&
 	(
 		cd directory-file &&
 
@@ -537,9 +530,15 @@ test_expect_success 'setup differently handled merges of directory/file conflict
 
 		git checkout B^0 &&
 		test_must_fail git merge C^0 &&
-		git clean -fd &&
-		git rm -rf a/ &&
-		git rm a &&
+		if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+		then
+			git rm -rf a/ &&
+			git rm a~HEAD
+		else
+			git clean -fd &&
+			git rm -rf a/ &&
+			git rm a
+		fi &&
 		git cat-file -p B:a >a2 &&
 		git add a2 &&
 		git commit -m D2 &&
@@ -558,7 +557,12 @@ test_expect_success 'setup differently handled merges of directory/file conflict
 
 		git checkout C^0 &&
 		test_must_fail git merge B^0 &&
-		git clean -fd &&
+		if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+		then
+			git rm a~B^0
+		else
+			git clean -fd
+		fi &&
 		git rm -rf a/ &&
 		test_write_lines 1 2 3 4 5 6 7 8 >a &&
 		git add a &&
@@ -567,9 +571,15 @@ test_expect_success 'setup differently handled merges of directory/file conflict
 
 		git checkout C^0 &&
 		test_must_fail git merge B^0 &&
-		git clean -fd &&
-		git rm -rf a/ &&
-		git rm a &&
+		if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+		then
+			git rm -rf a/ &&
+			git rm a~B^0
+		else
+			git clean -fd &&
+			git rm -rf a/ &&
+			git rm a
+		fi &&
 		test_write_lines 1 2 3 4 5 6 7 8 >a2 &&
 		git add a2 &&
 		git commit -m E4 &&
@@ -587,18 +597,34 @@ test_expect_success 'merge of D1 & E1 fails but has appropriate contents' '
 
 		test_must_fail git merge -s recursive E1^0 &&
 
-		git ls-files -s >out &&
-		test_line_count = 2 out &&
-		git ls-files -u >out &&
-		test_line_count = 1 out &&
-		git ls-files -o >out &&
-		test_line_count = 1 out &&
-
-		git rev-parse >expect    \
-			A:ignore-me  B:a &&
-		git rev-parse   >actual   \
-			:0:ignore-me :2:a &&
-		test_cmp expect actual
+		if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+		then
+			git ls-files -s >out &&
+			test_line_count = 3 out &&
+			git ls-files -u >out &&
+			test_line_count = 2 out &&
+			git ls-files -o >out &&
+			test_line_count = 1 out &&
+
+			git rev-parse >expect    \
+				A:ignore-me  B:a  D1:a &&
+			git rev-parse   >actual   \
+				:0:ignore-me :1:a :2:a &&
+			test_cmp expect actual
+		else
+			git ls-files -s >out &&
+			test_line_count = 2 out &&
+			git ls-files -u >out &&
+			test_line_count = 1 out &&
+			git ls-files -o >out &&
+			test_line_count = 1 out &&
+
+			git rev-parse >expect    \
+				A:ignore-me  B:a &&
+			git rev-parse   >actual   \
+				:0:ignore-me :2:a &&
+			test_cmp expect actual
+		fi
 	)
 '
 
@@ -612,18 +638,34 @@ test_expect_success 'merge of E1 & D1 fails but has appropriate contents' '
 
 		test_must_fail git merge -s recursive D1^0 &&
 
-		git ls-files -s >out &&
-		test_line_count = 2 out &&
-		git ls-files -u >out &&
-		test_line_count = 1 out &&
-		git ls-files -o >out &&
-		test_line_count = 1 out &&
-
-		git rev-parse >expect    \
-			A:ignore-me  B:a &&
-		git rev-parse   >actual   \
-			:0:ignore-me :3:a &&
-		test_cmp expect actual
+		if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+		then
+			git ls-files -s >out &&
+			test_line_count = 3 out &&
+			git ls-files -u >out &&
+			test_line_count = 2 out &&
+			git ls-files -o >out &&
+			test_line_count = 1 out &&
+
+			git rev-parse >expect    \
+				A:ignore-me  B:a  D1:a &&
+			git rev-parse   >actual   \
+				:0:ignore-me :1:a :3:a &&
+			test_cmp expect actual
+		else
+			git ls-files -s >out &&
+			test_line_count = 2 out &&
+			git ls-files -u >out &&
+			test_line_count = 1 out &&
+			git ls-files -o >out &&
+			test_line_count = 1 out &&
+
+			git rev-parse >expect    \
+				A:ignore-me  B:a &&
+			git rev-parse   >actual   \
+				:0:ignore-me :3:a &&
+			test_cmp expect actual
+		fi
 	)
 '
 
@@ -637,17 +679,32 @@ test_expect_success 'merge of D1 & E2 fails but has appropriate contents' '
 
 		test_must_fail git merge -s recursive E2^0 &&
 
-		git ls-files -s >out &&
-		test_line_count = 4 out &&
-		git ls-files -u >out &&
-		test_line_count = 3 out &&
-		git ls-files -o >out &&
-		test_line_count = 2 out &&
-
-		git rev-parse >expect    \
-			B:a   E2:a/file  C:a/file   A:ignore-me &&
-		git rev-parse   >actual   \
-			:2:a  :3:a/file  :1:a/file  :0:ignore-me &&
+		if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+		then
+			git ls-files -s >out &&
+			test_line_count = 5 out &&
+			git ls-files -u >out &&
+			test_line_count = 4 out &&
+			git ls-files -o >out &&
+			test_line_count = 1 out &&
+
+			git rev-parse >expect    \
+				B:a       D1:a      E2:a/file  C:a/file   A:ignore-me &&
+			git rev-parse   >actual   \
+				:1:a~HEAD :2:a~HEAD :3:a/file  :1:a/file  :0:ignore-me
+		else
+			git ls-files -s >out &&
+			test_line_count = 4 out &&
+			git ls-files -u >out &&
+			test_line_count = 3 out &&
+			git ls-files -o >out &&
+			test_line_count = 2 out &&
+
+			git rev-parse >expect    \
+				B:a    E2:a/file  C:a/file   A:ignore-me &&
+			git rev-parse   >actual   \
+				:2:a   :3:a/file  :1:a/file  :0:ignore-me
+		fi &&
 		test_cmp expect actual &&
 
 		test_path_is_file a~HEAD
@@ -664,17 +721,32 @@ test_expect_success 'merge of E2 & D1 fails but has appropriate contents' '
 
 		test_must_fail git merge -s recursive D1^0 &&
 
-		git ls-files -s >out &&
-		test_line_count = 4 out &&
-		git ls-files -u >out &&
-		test_line_count = 3 out &&
-		git ls-files -o >out &&
-		test_line_count = 2 out &&
-
-		git rev-parse >expect    \
-			B:a   E2:a/file  C:a/file   A:ignore-me &&
-		git rev-parse   >actual   \
-			:3:a  :2:a/file  :1:a/file  :0:ignore-me &&
+		if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+		then
+			git ls-files -s >out &&
+			test_line_count = 5 out &&
+			git ls-files -u >out &&
+			test_line_count = 4 out &&
+			git ls-files -o >out &&
+			test_line_count = 1 out &&
+
+			git rev-parse >expect    \
+				B:a       D1:a      E2:a/file  C:a/file   A:ignore-me &&
+			git rev-parse   >actual   \
+				:1:a~D1^0 :3:a~D1^0 :2:a/file  :1:a/file  :0:ignore-me
+		else
+			git ls-files -s >out &&
+			test_line_count = 4 out &&
+			git ls-files -u >out &&
+			test_line_count = 3 out &&
+			git ls-files -o >out &&
+			test_line_count = 2 out &&
+
+			git rev-parse >expect    \
+				B:a   E2:a/file  C:a/file   A:ignore-me &&
+			git rev-parse   >actual   \
+				:3:a  :2:a/file  :1:a/file  :0:ignore-me
+		fi &&
 		test_cmp expect actual &&
 
 		test_path_is_file a~D1^0
@@ -706,7 +778,7 @@ test_expect_success 'merge of D1 & E3 succeeds' '
 	)
 '
 
-test_expect_success 'merge of D1 & E4 notifies user a and a2 are related' '
+test_expect_merge_algorithm failure success 'merge of D1 & E4 puts merge of a and a2 in both a and a2' '
 	test_when_finished "git -C directory-file reset --hard" &&
 	test_when_finished "git -C directory-file clean -fdqx" &&
 	(
@@ -724,7 +796,7 @@ test_expect_success 'merge of D1 & E4 notifies user a and a2 are related' '
 		test_line_count = 1 out &&
 
 		git rev-parse >expect                  \
-			A:ignore-me  B:a   D1:a  E4:a2 &&
+			A:ignore-me  B:a   E4:a2  E4:a2 &&
 		git rev-parse   >actual                \
 			:0:ignore-me :1:a~Temporary\ merge\ branch\ 2  :2:a  :3:a2 &&
 		test_cmp expect actual
@@ -796,7 +868,7 @@ test_expect_failure 'merge of D2 & E4 merges a2s & reports conflict for a/file'
 # but that may cancel out at the final merge stage".
 
 test_expect_success 'setup rename/rename(1to2)/modify followed by what looks like rename/rename(2to1)/modify' '
-	test_create_repo rename-squared-squared &&
+	git init rename-squared-squared &&
 	(
 		cd rename-squared-squared &&
 
@@ -873,7 +945,7 @@ test_expect_success 'handle rename/rename(1to2)/modify followed by what looks li
 # content merge handled.
 
 test_expect_success 'setup criss-cross + rename/rename/add-source + modify/modify' '
-	test_create_repo rename-rename-add-source &&
+	git init rename-rename-add-source &&
 	(
 		cd rename-rename-add-source &&
 
@@ -961,7 +1033,7 @@ test_expect_failure 'detect rename/rename/add-source for virtual merge-base' '
 # base of B & C needs to not delete B:c for that to work, though...
 
 test_expect_success 'setup criss-cross+rename/rename/add-dest + simple modify' '
-	test_create_repo rename-rename-add-dest &&
+	git init rename-rename-add-dest &&
 	(
 		cd rename-rename-add-dest &&
 
@@ -1040,7 +1112,7 @@ test_expect_success 'virtual merge base handles rename/rename(1to2)/add-dest' '
 # git detect it?
 
 test_expect_success 'setup symlink modify/modify' '
-	test_create_repo symlink-modify-modify &&
+	git init symlink-modify-modify &&
 	(
 		cd symlink-modify-modify &&
 
@@ -1069,7 +1141,7 @@ test_expect_success 'setup symlink modify/modify' '
 	)
 '
 
-test_expect_failure 'check symlink modify/modify' '
+test_expect_merge_algorithm failure success 'check symlink modify/modify' '
 	(
 		cd symlink-modify-modify &&
 
@@ -1107,7 +1179,7 @@ test_expect_failure 'check symlink modify/modify' '
 # git detect it?
 
 test_expect_success 'setup symlink add/add' '
-	test_create_repo symlink-add-add &&
+	git init symlink-add-add &&
 	(
 		cd symlink-add-add &&
 
@@ -1135,7 +1207,7 @@ test_expect_success 'setup symlink add/add' '
 	)
 '
 
-test_expect_failure 'check symlink add/add' '
+test_expect_merge_algorithm failure success 'check symlink add/add' '
 	(
 		cd symlink-add-add &&
 
@@ -1144,7 +1216,7 @@ test_expect_failure 'check symlink add/add' '
 		test_must_fail git merge -s recursive E^0 &&
 
 		git ls-files -s >out &&
-		test_line_count = 2 out &&
+		test_line_count = 3 out &&
 		git ls-files -u >out &&
 		test_line_count = 2 out &&
 		git ls-files -o >out &&
@@ -1173,11 +1245,11 @@ test_expect_failure 'check symlink add/add' '
 # git detect it?
 
 test_expect_success 'setup submodule modify/modify' '
-	test_create_repo submodule-modify-modify &&
+	git init submodule-modify-modify &&
 	(
 		cd submodule-modify-modify &&
 
-		test_create_repo submod &&
+		git init submod &&
 		(
 			cd submod &&
 			touch file-A &&
@@ -1223,7 +1295,7 @@ test_expect_success 'setup submodule modify/modify' '
 	)
 '
 
-test_expect_failure 'check submodule modify/modify' '
+test_expect_merge_algorithm failure success 'check submodule modify/modify' '
 	(
 		cd submodule-modify-modify &&
 
@@ -1261,11 +1333,11 @@ test_expect_failure 'check submodule modify/modify' '
 # git detect it?
 
 test_expect_success 'setup submodule add/add' '
-	test_create_repo submodule-add-add &&
+	git init submodule-add-add &&
 	(
 		cd submodule-add-add &&
 
-		test_create_repo submod &&
+		git init submod &&
 		(
 			cd submod &&
 			touch file-A &&
@@ -1311,7 +1383,7 @@ test_expect_success 'setup submodule add/add' '
 	)
 '
 
-test_expect_failure 'check submodule add/add' '
+test_expect_merge_algorithm failure success 'check submodule add/add' '
 	(
 		cd submodule-add-add &&
 
@@ -1348,11 +1420,11 @@ test_expect_failure 'check submodule add/add' '
 # This is an obvious add/add conflict for 'path'.  Can git detect it?
 
 test_expect_success 'setup conflicting entry types (submodule vs symlink)' '
-	test_create_repo submodule-symlink-add-add &&
+	git init submodule-symlink-add-add &&
 	(
 		cd submodule-symlink-add-add &&
 
-		test_create_repo path &&
+		git init path &&
 		(
 			cd path &&
 			touch file-B &&
@@ -1386,7 +1458,7 @@ test_expect_success 'setup conflicting entry types (submodule vs symlink)' '
 	)
 '
 
-test_expect_failure 'check conflicting entry types (submodule vs symlink)' '
+test_expect_merge_algorithm failure success 'check conflicting entry types (submodule vs symlink)' '
 	(
 		cd submodule-symlink-add-add &&
 
@@ -1423,7 +1495,7 @@ test_expect_failure 'check conflicting entry types (submodule vs symlink)' '
 # This is an obvious add/add mode conflict.  Can git detect it?
 
 test_expect_success 'setup conflicting modes for regular file' '
-	test_create_repo regular-file-mode-conflict &&
+	git init regular-file-mode-conflict &&
 	(
 		cd regular-file-mode-conflict &&
 
@@ -1473,12 +1545,12 @@ test_expect_failure 'check conflicting modes for regular file' '
 # Setup:
 #          L1---L2
 #         /  \ /  \
-#   master    X    ?
+#     main    X    ?
 #         \  / \  /
 #          R1---R2
 #
 # Where:
-#   master has two files, named 'b' and 'a'
+#   main has two files, named 'b' and 'a'
 #   branches L1 and R1 both modify each of the two files in conflicting ways
 #
 #   L2 is a merge of R1 into L1; more on it later.
@@ -1500,15 +1572,12 @@ test_expect_failure 'check conflicting modes for regular file' '
 #   to ensure that we handle it as well as practical.
 
 test_expect_success 'setup nested conflicts' '
-	test_create_repo nested_conflicts &&
+	git init nested_conflicts &&
 	(
 		cd nested_conflicts &&
 
 		# Create some related files now
-		for i in $(test_seq 1 10)
-		do
-			echo Random base content line $i
-		done >initial &&
+		printf "Random base content line %d\n" $(test_seq 1 10) >initial &&
 
 		cp initial b_L1 &&
 		cp initial b_R1 &&
@@ -1583,7 +1652,7 @@ test_expect_success 'check nested conflicts' '
 		cd nested_conflicts &&
 
 		git clean -f &&
-		MASTER=$(git rev-parse --short master) &&
+		MAIN=$(git rev-parse --short main) &&
 		git checkout L2^0 &&
 
 		# Merge must fail; there is a conflict
@@ -1599,24 +1668,24 @@ test_expect_success 'check nested conflicts' '
 		test_line_count = 1 out &&
 
 		# Create a and b from virtual merge base X
-		git cat-file -p master:a >base &&
+		git cat-file -p main:a >base &&
 		git cat-file -p L1:a >ours &&
 		git cat-file -p R1:a >theirs &&
 		test_must_fail git merge-file --diff3 \
 			-L "Temporary merge branch 1" \
-			-L "$MASTER"  \
+			-L "$MAIN"  \
 			-L "Temporary merge branch 2" \
 			ours  \
 			base  \
 			theirs &&
 		sed -e "s/^\([<|=>]\)/\1\1/" ours >vmb_a &&
 
-		git cat-file -p master:b >base &&
+		git cat-file -p main:b >base &&
 		git cat-file -p L1:b >ours &&
 		git cat-file -p R1:b >theirs &&
 		test_must_fail git merge-file --diff3 \
 			-L "Temporary merge branch 1" \
-			-L "$MASTER"  \
+			-L "$MAIN"  \
 			-L "Temporary merge branch 2" \
 			ours  \
 			base  \
@@ -1668,12 +1737,12 @@ test_expect_success 'check nested conflicts' '
 # Setup:
 #          L1---L2---L3
 #         /  \ /  \ /  \
-#   master    X1   X2   ?
+#     main    X1   X2   ?
 #         \  / \  / \  /
 #          R1---R2---R3
 #
 # Where:
-#   master has one file named 'content'
+#   main has one file named 'content'
 #   branches L1 and R1 both modify each of the two files in conflicting ways
 #
 #   L<n> (n>1) is a merge of R<n-1> into L<n-1>
@@ -1689,15 +1758,12 @@ test_expect_success 'check nested conflicts' '
 #   have three levels of conflict markers.  Can we distinguish all three?
 
 test_expect_success 'setup virtual merge base with nested conflicts' '
-	test_create_repo virtual_merge_base_has_nested_conflicts &&
+	git init virtual_merge_base_has_nested_conflicts &&
 	(
 		cd virtual_merge_base_has_nested_conflicts &&
 
 		# Create some related files now
-		for i in $(test_seq 1 10)
-		do
-			echo Random base content line $i
-		done >content &&
+		printf "Random base content line %d\n" $(test_seq 1 10) >content &&
 
 		# Setup original commit
 		git add content &&
@@ -1754,7 +1820,7 @@ test_expect_success 'check virtual merge base with nested conflicts' '
 	(
 		cd virtual_merge_base_has_nested_conflicts &&
 
-		MASTER=$(git rev-parse --short master) &&
+		MAIN=$(git rev-parse --short main) &&
 		git checkout L3^0 &&
 
 		# Merge must fail; there is a conflict
@@ -1777,13 +1843,13 @@ test_expect_success 'check virtual merge base with nested conflicts' '
 		# Imitate X1 merge base, except without long enough conflict
 		# markers because a subsequent sed will modify them.  Put
 		# result into vmb.
-		git cat-file -p master:content >base &&
+		git cat-file -p main:content >base &&
 		git cat-file -p L:content >left &&
 		git cat-file -p R:content >right &&
 		cp left merged-once &&
 		test_must_fail git merge-file --diff3 \
 			-L "Temporary merge branch 1" \
-			-L "$MASTER"  \
+			-L "$MAIN"  \
 			-L "Temporary merge branch 2" \
 			merged-once \
 			base        \
diff --git a/t/t6037-merge-ours-theirs.sh b/t/t6417-merge-ours-theirs.sh
index 0aebc6c..482b73a 100755
--- a/t/t6037-merge-ours-theirs.sh
+++ b/t/t6417-merge-ours-theirs.sh
@@ -1,13 +1,14 @@
 #!/bin/sh
 
 test_description='Merge-recursive ours and theirs variants'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
-	for i in 1 2 3 4 5 6 7 8 9
-	do
-		echo "$i"
-	done >file &&
+	test_write_lines 1 2 3 4 5 6 7 8 9 >file &&
 	git add file &&
 	cp file elif &&
 	git commit -m initial &&
@@ -20,11 +21,11 @@ test_expect_success setup '
 	sed -e "s/9/nueve/" >file <elif &&
 	git commit -a -m theirs &&
 
-	git checkout master^0
+	git checkout main^0
 '
 
 test_expect_success 'plain recursive - should conflict' '
-	git reset --hard master &&
+	git reset --hard main &&
 	test_must_fail git merge -s recursive side &&
 	grep nine file &&
 	grep nueve file &&
@@ -34,7 +35,7 @@ test_expect_success 'plain recursive - should conflict' '
 '
 
 test_expect_success 'recursive favouring theirs' '
-	git reset --hard master &&
+	git reset --hard main &&
 	git merge -s recursive -Xtheirs side &&
 	! grep nine file &&
 	grep nueve file &&
@@ -44,7 +45,7 @@ test_expect_success 'recursive favouring theirs' '
 '
 
 test_expect_success 'recursive favouring ours' '
-	git reset --hard master &&
+	git reset --hard main &&
 	git merge -s recursive -X ours side &&
 	grep nine file &&
 	! grep nueve file &&
@@ -56,26 +57,26 @@ test_expect_success 'recursive favouring ours' '
 test_expect_success 'binary file with -Xours/-Xtheirs' '
 	echo file binary >.gitattributes &&
 
-	git reset --hard master &&
+	git reset --hard main &&
 	git merge -s recursive -X theirs side &&
 	git diff --exit-code side HEAD -- file &&
 
-	git reset --hard master &&
+	git reset --hard main &&
 	git merge -s recursive -X ours side &&
-	git diff --exit-code master HEAD -- file
+	git diff --exit-code main HEAD -- file
 '
 
 test_expect_success 'pull passes -X to underlying merge' '
-	git reset --hard master && git pull -s recursive -Xours . side &&
-	git reset --hard master && git pull -s recursive -X ours . side &&
-	git reset --hard master && git pull -s recursive -Xtheirs . side &&
-	git reset --hard master && git pull -s recursive -X theirs . side &&
-	git reset --hard master && test_must_fail git pull -s recursive -X bork . side
+	git reset --hard main && git pull --no-rebase -s recursive -Xours . side &&
+	git reset --hard main && git pull --no-rebase -s recursive -X ours . side &&
+	git reset --hard main && git pull --no-rebase -s recursive -Xtheirs . side &&
+	git reset --hard main && git pull --no-rebase -s recursive -X theirs . side &&
+	git reset --hard main && test_must_fail git pull --no-rebase -s recursive -X bork . side
 '
 
 test_expect_success SYMLINKS 'symlink with -Xours/-Xtheirs' '
-	git reset --hard master &&
-	git checkout -b two master &&
+	git reset --hard main &&
+	git checkout -b two main &&
 	ln -s target-zero link &&
 	git add link &&
 	git commit -m "add link pointing to zero" &&
diff --git a/t/t6038-merge-text-auto.sh b/t/t6418-merge-text-auto.sh
index 89c86d4..48a62cb 100755
--- a/t/t6038-merge-text-auto.sh
+++ b/t/t6418-merge-text-auto.sh
@@ -2,16 +2,20 @@
 
 test_description='CRLF merge conflict across text=auto change
 
-* [master] remove .gitattributes
+* [main] remove .gitattributes
  ! [side] add line from b
 --
  + [side] add line from b
-*  [master] remove .gitattributes
-*  [master^] add line from a
-*  [master~2] normalize file
+*  [main] remove .gitattributes
+*  [main^] add line from a
+*  [main~2] normalize file
 *+ [side^] Initial
 '
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_have_prereq SED_STRIPS_CR && SED_OPTIONS=-b
@@ -64,7 +68,7 @@ test_expect_success setup '
 	git commit -m "add line from b" &&
 	git tag b &&
 
-	git checkout master
+	git checkout main
 '
 
 test_expect_success 'set up fuzz_conflict() helper' '
@@ -195,9 +199,36 @@ test_expect_success 'Test delete/normalize conflict' '
 	git reset --hard initial &&
 	git rm file &&
 	git commit -m "remove file" &&
-	git checkout master &&
+	git checkout main &&
 	git reset --hard a^ &&
-	git merge side
+	git merge side &&
+	test_path_is_missing file
+'
+
+test_expect_success 'rename/delete vs. renormalization' '
+	git init subrepo &&
+	(
+		cd subrepo &&
+		echo foo >oldfile &&
+		git add oldfile &&
+		git commit -m original &&
+
+		git branch rename &&
+		git branch nuke &&
+
+		git checkout rename &&
+		git mv oldfile newfile &&
+		git commit -m renamed &&
+
+		git checkout nuke &&
+		git rm oldfile &&
+		git commit -m deleted &&
+
+		git checkout rename^0 &&
+		test_must_fail git -c merge.renormalize=true merge nuke >out &&
+
+		grep "rename/delete" out
+	)
 '
 
 test_done
diff --git a/t/t6039-merge-ignorecase.sh b/t/t6419-merge-ignorecase.sh
index 531850d..b64b75a 100755
--- a/t/t6039-merge-ignorecase.sh
+++ b/t/t6419-merge-ignorecase.sh
@@ -2,6 +2,9 @@
 
 test_description='git-merge with case-changing rename on case-insensitive file system'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 if ! test_have_prereq CASE_INSENSITIVE_FS
@@ -20,18 +23,18 @@ test_expect_success 'merge with case-changing rename' '
 	>foo &&
 	git add foo &&
 	git commit -m "intervening commit" &&
-	git checkout master &&
+	git checkout main &&
 	git rm TestCase &&
 	>testcase &&
 	git add testcase &&
 	git commit -m "rename to testcase" &&
 	git checkout with-camel &&
-	git merge master -m "merge" &&
+	git merge main -m "merge" &&
 	test_path_is_file testcase
 '
 
 test_expect_success 'merge with case-changing rename on both sides' '
-	git checkout master &&
+	git checkout main &&
 	git reset --hard baseline &&
 	git branch -D with-camel &&
 	git checkout -b with-camel &&
@@ -40,13 +43,13 @@ test_expect_success 'merge with case-changing rename on both sides' '
 	>foo &&
 	git add foo &&
 	git commit -m "intervening commit" &&
-	git checkout master &&
+	git checkout main &&
 	git rm TestCase &&
 	>testcase &&
 	git add testcase &&
 	git commit -m "rename to testcase" &&
 	git checkout with-camel &&
-	git merge master -m "merge" &&
+	git merge main -m "merge" &&
 	test_path_is_file testcase
 '
 
diff --git a/t/t6421-merge-partial-clone.sh b/t/t6421-merge-partial-clone.sh
new file mode 100755
index 0000000..711b709
--- /dev/null
+++ b/t/t6421-merge-partial-clone.sh
@@ -0,0 +1,440 @@
+#!/bin/sh
+
+test_description="limiting blob downloads when merging with partial clones"
+# Uses a methodology similar to
+#   t6042: corner cases with renames but not criss-cross merges
+#   t6036: corner cases with both renames and criss-cross merges
+#   t6423: directory rename detection
+#
+# The setup for all of them, pictorially, is:
+#
+#      A
+#      o
+#     / \
+#  O o   ?
+#     \ /
+#      o
+#      B
+#
+# To help make it easier to follow the flow of tests, they have been
+# divided into sections and each test will start with a quick explanation
+# of what commits O, A, and B contain.
+#
+# Notation:
+#    z/{b,c}   means  files z/b and z/c both exist
+#    x/d_1     means  file x/d exists with content d1.  (Purpose of the
+#                     underscore notation is to differentiate different
+#                     files that might be renamed into each other's paths.)
+
+. ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-merge.sh
+
+test_setup_repo () {
+	test -d server && return
+	git init server &&
+	(
+		cd server &&
+
+		git config uploadpack.allowfilter 1 &&
+		git config uploadpack.allowanysha1inwant 1 &&
+
+		mkdir -p general &&
+		test_seq 2 9 >general/leap1 &&
+		cp general/leap1 general/leap2 &&
+		echo leap2 >>general/leap2 &&
+
+		mkdir -p basename &&
+		cp general/leap1 basename/numbers &&
+		cp general/leap1 basename/sequence &&
+		cp general/leap1 basename/values &&
+		echo numbers >>basename/numbers &&
+		echo sequence >>basename/sequence &&
+		echo values >>basename/values &&
+
+		mkdir -p dir/unchanged &&
+		mkdir -p dir/subdir/tweaked &&
+		echo a >dir/subdir/a &&
+		echo b >dir/subdir/b &&
+		echo c >dir/subdir/c &&
+		echo d >dir/subdir/d &&
+		echo e >dir/subdir/e &&
+		cp general/leap1 dir/subdir/Makefile &&
+		echo toplevel makefile >>dir/subdir/Makefile &&
+		echo f >dir/subdir/tweaked/f &&
+		echo g >dir/subdir/tweaked/g &&
+		echo h >dir/subdir/tweaked/h &&
+		echo subdirectory makefile >dir/subdir/tweaked/Makefile &&
+		for i in $(test_seq 1 88)
+		do
+			echo content $i >dir/unchanged/file_$i
+		done &&
+		git add . &&
+		git commit -m "O" &&
+
+		git branch O &&
+		git branch A &&
+		git branch B-single &&
+		git branch B-dir &&
+		git branch B-many &&
+
+		git switch A &&
+
+		git rm general/leap* &&
+		mkdir general/ &&
+		test_seq 1 9 >general/jump1 &&
+		cp general/jump1 general/jump2 &&
+		echo leap2 >>general/jump2 &&
+
+		rm basename/numbers basename/sequence basename/values &&
+		mkdir -p basename/subdir/
+		cp general/jump1 basename/subdir/numbers &&
+		cp general/jump1 basename/subdir/sequence &&
+		cp general/jump1 basename/subdir/values &&
+		echo numbers >>basename/subdir/numbers &&
+		echo sequence >>basename/subdir/sequence &&
+		echo values >>basename/subdir/values &&
+
+		git rm dir/subdir/tweaked/f &&
+		echo more >>dir/subdir/e &&
+		echo more >>dir/subdir/Makefile &&
+		echo more >>dir/subdir/tweaked/Makefile &&
+		mkdir dir/subdir/newsubdir &&
+		echo rust code >dir/subdir/newsubdir/newfile.rs &&
+		git mv dir/subdir/e dir/subdir/newsubdir/ &&
+		git mv dir folder &&
+		git add . &&
+		git commit -m "A" &&
+
+		git switch B-single &&
+		echo new first line >dir/subdir/Makefile &&
+		cat general/leap1 >>dir/subdir/Makefile &&
+		echo toplevel makefile >>dir/subdir/Makefile &&
+		echo perl code >general/newfile.pl &&
+		git add . &&
+		git commit -m "B-single" &&
+
+		git switch B-dir &&
+		echo java code >dir/subdir/newfile.java &&
+		echo scala code >dir/subdir/newfile.scala &&
+		echo groovy code >dir/subdir/newfile.groovy &&
+		git add . &&
+		git commit -m "B-dir" &&
+
+		git switch B-many &&
+		test_seq 2 10 >general/leap1 &&
+		rm general/leap2 &&
+		cp general/leap1 general/leap2 &&
+		echo leap2 >>general/leap2 &&
+
+		rm basename/numbers basename/sequence basename/values &&
+		mkdir -p basename/subdir/
+		cp general/leap1 basename/subdir/numbers &&
+		cp general/leap1 basename/subdir/sequence &&
+		cp general/leap1 basename/subdir/values &&
+		echo numbers >>basename/subdir/numbers &&
+		echo sequence >>basename/subdir/sequence &&
+		echo values >>basename/subdir/values &&
+
+		mkdir dir/subdir/newsubdir/ &&
+		echo c code >dir/subdir/newfile.c &&
+		echo python code >dir/subdir/newsubdir/newfile.py &&
+		git add . &&
+		git commit -m "B-many" &&
+
+		git switch A
+	)
+}
+
+# Testcase: Objects downloaded for single relevant rename
+#   Commit O:
+#              general/{leap1_O, leap2_O}
+#              basename/{numbers_O, sequence_O, values_O}
+#              dir/subdir/{a,b,c,d,e_O,Makefile_TOP_O}
+#              dir/subdir/tweaked/{f,g,h,Makefile_SUB_O}
+#              dir/unchanged/<LOTS OF FILES>
+#   Commit A:
+#     (Rename leap->jump, rename basename/ -> basename/subdir/, rename dir/
+#      -> folder/, move e into newsubdir, add newfile.rs, remove f, modify
+#      both Makefiles and jumps)
+#              general/{jump1_A, jump2_A}
+#              basename/subdir/{numbers_A, sequence_A, values_A}
+#              folder/subdir/{a,b,c,d,Makefile_TOP_A}
+#              folder/subdir/newsubdir/{e_A,newfile.rs}
+#              folder/subdir/tweaked/{g,h,Makefile_SUB_A}
+#              folder/unchanged/<LOTS OF FILES>
+#   Commit B(-single):
+#     (add newfile.pl, tweak Makefile_TOP)
+#              general/{leap1_O, leap2_O,newfile.pl}
+#              basename/{numbers_O, sequence_O, values_O}
+#              dir/{a,b,c,d,e_O,Makefile_TOP_B}
+#              dir/tweaked/{f,g,h,Makefile_SUB_O}
+#              dir/unchanged/<LOTS OF FILES>
+#   Expected:
+#              general/{jump1_A, jump2_A,newfile.pl}
+#              basename/subdir/{numbers_A, sequence_A, values_A}
+#              folder/subdir/{a,b,c,d,Makefile_TOP_Merged}
+#              folder/subdir/newsubdir/{e_A,newfile.rs}
+#              folder/subdir/tweaked/{g,h,Makefile_SUB_A}
+#              folder/unchanged/<LOTS OF FILES>
+#
+# Objects that need to be fetched:
+#   Rename detection:
+#     Side1 (O->A):
+#       Basename-matches rename detection only needs to fetch these objects:
+#         Makefile_TOP_O, Makefile_TOP_A
+#         (Despite many renames, all others are content irrelevant.  They
+#          are also location irrelevant because newfile.rs was added on
+#          the side doing the directory rename, and newfile.pl was added to
+#          a directory that was not renamed on either side.)
+#       General rename detection only needs to fetch these objects:
+#         <None>
+#          (Even though newfile.rs, jump[12], basename/subdir/*, and e
+#          could all be used as destinations in rename detection, the
+#          basename detection for Makefile matches up all relevant
+#          sources, so these other files never end up needing to be
+#          used)
+#     Side2 (O->B):
+#       Basename-matches rename detection only needs to fetch these objects:
+#         <None>
+#         (there are no deleted files, so no possible sources)
+#       General rename detection only needs to fetch these objects:
+#         <None>
+#         (there are no deleted files, so no possible sources)
+#   Merge:
+#     3-way content merge needs to grab these objects:
+#       Makefile_TOP_B
+#   Nothing else needs to fetch objects
+#
+#   Summary: 2 fetches (1 for 2 objects, 1 for 1 object)
+#
+test_expect_merge_algorithm failure success 'Objects downloaded for single relevant rename' '
+	test_setup_repo &&
+	git clone --sparse --filter=blob:none "file://$(pwd)/server" objects-single &&
+	(
+		cd objects-single &&
+
+		git rev-list --objects --all --missing=print |
+			grep "^?" | sort >missing-objects-before &&
+
+		git checkout -q origin/A &&
+
+		GIT_TRACE2_PERF="$(pwd)/trace.output" git \
+			-c merge.directoryRenames=true merge --no-stat \
+			--no-progress origin/B-single &&
+
+		# Check the number of objects we reported we would fetch
+		cat >expect <<-EOF &&
+		fetch_count:2
+		fetch_count:1
+		EOF
+		grep fetch_count trace.output | cut -d "|" -f 9 | tr -d " ." >actual &&
+		test_cmp expect actual &&
+
+		# Check the number of fetch commands exec-ed
+		grep d0.*fetch.negotiationAlgorithm trace.output >fetches &&
+		test_line_count = 2 fetches &&
+
+		git rev-list --objects --all --missing=print |
+			grep "^?" | sort >missing-objects-after &&
+		comm -2 -3 missing-objects-before missing-objects-after >old &&
+		comm -1 -3 missing-objects-before missing-objects-after >new &&
+		# No new missing objects
+		test_must_be_empty new &&
+		# Fetched 2 + 1 = 3 objects
+		test_line_count = 3 old
+	)
+'
+
+# Testcase: Objects downloaded for directory rename
+#   Commit O:
+#              general/{leap1_O, leap2_O}
+#              basename/{numbers_O, sequence_O, values_O}
+#              dir/subdir/{a,b,c,d,e_O,Makefile_TOP_O}
+#              dir/subdir/tweaked/{f,g,h,Makefile_SUB_O}
+#              dir/unchanged/<LOTS OF FILES>
+#   Commit A:
+#     (Rename leap->jump, rename basename/ -> basename/subdir/, rename dir/ ->
+#      folder/, move e into newsubdir, add newfile.rs, remove f, modify
+#      both Makefiles and jumps)
+#              general/{jump1_A, jump2_A}
+#              basename/subdir/{numbers_A, sequence_A, values_A}
+#              folder/subdir/{a,b,c,d,Makefile_TOP_A}
+#              folder/subdir/newsubdir/{e_A,newfile.rs}
+#              folder/subdir/tweaked/{g,h,Makefile_SUB_A}
+#              folder/unchanged/<LOTS OF FILES>
+#   Commit B(-dir):
+#     (add dir/subdir/newfile.{java,scala,groovy}
+#              general/{leap1_O, leap2_O}
+#              basename/{numbers_O, sequence_O, values_O}
+#              dir/subdir/{a,b,c,d,e_O,Makefile_TOP_O,
+#                          newfile.java,newfile.scala,newfile.groovy}
+#              dir/subdir/tweaked/{f,g,h,Makefile_SUB_O}
+#              dir/unchanged/<LOTS OF FILES>
+#   Expected:
+#              general/{jump1_A, jump2_A}
+#              basename/subdir/{numbers_A, sequence_A, values_A}
+#              folder/subdir/{a,b,c,d,Makefile_TOP_A,
+#                             newfile.java,newfile.scala,newfile.groovy}
+#              folder/subdir/newsubdir/{e_A,newfile.rs}
+#              folder/subdir/tweaked/{g,h,Makefile_SUB_A}
+#              folder/unchanged/<LOTS OF FILES>
+#
+# Objects that need to be fetched:
+#   Makefile_TOP_O, Makefile_TOP_A
+#   Makefile_SUB_O, Makefile_SUB_A
+#   e_O, e_A
+#   * Despite A's rename of jump->leap, those renames are irrelevant.
+#   * Despite A's rename of basename/ -> basename/subdir/, those renames are
+#     irrelevant.
+#   * Because of A's rename of dir/ -> folder/ and B-dir's addition of
+#     newfile.* into dir/subdir/, we need to determine directory renames.
+#     (Technically, there are enough exact renames to determine directory
+#      rename detection, but the current implementation always does
+#      basename searching before directory rename detection.  Running it
+#      also before basename searching would mean doing directory rename
+#      detection twice, but it's a bit expensive to do that and cases like
+#      this are not all that common.)
+#   Summary: 1 fetches for 6 objects
+#
+test_expect_merge_algorithm failure success 'Objects downloaded when a directory rename triggered' '
+	test_setup_repo &&
+	git clone --sparse --filter=blob:none "file://$(pwd)/server" objects-dir &&
+	(
+		cd objects-dir &&
+
+		git rev-list --objects --all --missing=print |
+			grep "^?" | sort >missing-objects-before &&
+
+		git checkout -q origin/A &&
+
+		GIT_TRACE2_PERF="$(pwd)/trace.output" git \
+			-c merge.directoryRenames=true merge --no-stat \
+			--no-progress origin/B-dir &&
+
+		# Check the number of objects we reported we would fetch
+		cat >expect <<-EOF &&
+		fetch_count:6
+		EOF
+		grep fetch_count trace.output | cut -d "|" -f 9 | tr -d " ." >actual &&
+		test_cmp expect actual &&
+
+		# Check the number of fetch commands exec-ed
+		grep d0.*fetch.negotiationAlgorithm trace.output >fetches &&
+		test_line_count = 1 fetches &&
+
+		git rev-list --objects --all --missing=print |
+			grep "^?" | sort >missing-objects-after &&
+		comm -2 -3 missing-objects-before missing-objects-after >old &&
+		comm -1 -3 missing-objects-before missing-objects-after >new &&
+		# No new missing objects
+		test_must_be_empty new &&
+		# Fetched 6 objects
+		test_line_count = 6 old
+	)
+'
+
+# Testcase: Objects downloaded with lots of renames and modifications
+#   Commit O:
+#              general/{leap1_O, leap2_O}
+#              basename/{numbers_O, sequence_O, values_O}
+#              dir/subdir/{a,b,c,d,e_O,Makefile_TOP_O}
+#              dir/subdir/tweaked/{f,g,h,Makefile_SUB_O}
+#              dir/unchanged/<LOTS OF FILES>
+#   Commit A:
+#     (Rename leap->jump, rename basename/ -> basename/subdir/, rename dir/
+#      -> folder/, move e into newsubdir, add newfile.rs, remove f, modify
+#      both Makefiles and jumps)
+#              general/{jump1_A, jump2_A}
+#              basename/subdir/{numbers_A, sequence_A, values_A}
+#              folder/subdir/{a,b,c,d,Makefile_TOP_A}
+#              folder/subdir/newsubdir/{e_A,newfile.rs}
+#              folder/subdir/tweaked/{g,h,Makefile_SUB_A}
+#              folder/unchanged/<LOTS OF FILES>
+#   Commit B(-minimal):
+#     (modify both leaps, rename basename/ -> basename/subdir/, add
+#      newfile.{c,py})
+#              general/{leap1_B, leap2_B}
+#              basename/subdir/{numbers_B, sequence_B, values_B}
+#              dir/{a,b,c,d,e_O,Makefile_TOP_O,newfile.c}
+#              dir/tweaked/{f,g,h,Makefile_SUB_O,newfile.py}
+#              dir/unchanged/<LOTS OF FILES>
+#   Expected:
+#              general/{jump1_Merged, jump2_Merged}
+#              basename/subdir/{numbers_Merged, sequence_Merged, values_Merged}
+#              folder/subdir/{a,b,c,d,Makefile_TOP_A,newfile.c}
+#              folder/subdir/newsubdir/e_A
+#              folder/subdir/tweaked/{g,h,Makefile_SUB_A,newfile.py}
+#              folder/unchanged/<LOTS OF FILES>
+#
+# Objects that need to be fetched:
+#   Rename detection:
+#     Side1 (O->A):
+#       Basename-matches rename detection only needs to fetch these objects:
+#         numbers_O, numbers_A
+#         sequence_O, sequence_A
+#         values_O, values_A
+#         Makefile_TOP_O, Makefile_TOP_A
+#         Makefile_SUB_O, Makefile_SUB_A
+#         e_O, e_A
+#       General rename detection only needs to fetch these objects:
+#         leap1_O, leap2_O
+#         jump1_A, jump2_A, newfile.rs
+#         (only need remaining relevant sources, but any relevant sources need
+#          to be matched against all possible unpaired destinations)
+#     Side2 (O->B):
+#       Basename-matches rename detection only needs to fetch these objects:
+#         numbers_B
+#         sequence_B
+#         values_B
+#       (because numbers_O, sequence_O, and values_O already fetched above)
+#       General rename detection only needs to fetch these objects:
+#         <None>
+#   Merge:
+#     3-way content merge needs to grab these objects:
+#       leap1_B
+#       leap2_B
+#   Nothing else needs to fetch objects
+#
+#   Summary: 4 fetches (1 for 6 objects, 1 for 8, 1 for 3, 1 for 2)
+#
+test_expect_merge_algorithm failure success 'Objects downloaded with lots of renames and modifications' '
+	test_setup_repo &&
+	git clone --sparse --filter=blob:none "file://$(pwd)/server" objects-many &&
+	(
+		cd objects-many &&
+
+		git rev-list --objects --all --missing=print |
+			grep "^?" | sort >missing-objects-before &&
+
+		git checkout -q origin/A &&
+
+		GIT_TRACE2_PERF="$(pwd)/trace.output" git \
+			-c merge.directoryRenames=true merge --no-stat \
+			--no-progress origin/B-many &&
+
+		# Check the number of objects we reported we would fetch
+		cat >expect <<-EOF &&
+		fetch_count:12
+		fetch_count:5
+		fetch_count:3
+		fetch_count:2
+		EOF
+		grep fetch_count trace.output | cut -d "|" -f 9 | tr -d " ." >actual &&
+		test_cmp expect actual &&
+
+		# Check the number of fetch commands exec-ed
+		grep d0.*fetch.negotiationAlgorithm trace.output >fetches &&
+		test_line_count = 4 fetches &&
+
+		git rev-list --objects --all --missing=print |
+			grep "^?" | sort >missing-objects-after &&
+		comm -2 -3 missing-objects-before missing-objects-after >old &&
+		comm -1 -3 missing-objects-before missing-objects-after >new &&
+		# No new missing objects
+		test_must_be_empty new &&
+		# Fetched 12 + 5 + 3 + 2 = 22 objects
+		test_line_count = 22 old
+	)
+'
+
+test_done
diff --git a/t/t6042-merge-rename-corner-cases.sh b/t/t6422-merge-rename-corner-cases.sh
index f163893..80d7b5e 100755
--- a/t/t6042-merge-rename-corner-cases.sh
+++ b/t/t6422-merge-rename-corner-cases.sh
@@ -3,10 +3,15 @@
 test_description="recursive merge corner cases w/ renames but not criss-crosses"
 # t6036 has corner cases that involve both criss-cross merges and renames
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-merge.sh
 
 test_setup_rename_delete_untracked () {
-	test_create_repo rename-delete-untracked &&
+	git init rename-delete-untracked &&
 	(
 		cd rename-delete-untracked &&
 
@@ -51,7 +56,7 @@ test_expect_success "Does git preserve Gollum's precious artifact?" '
 # We should be able to merge B & C cleanly
 
 test_setup_rename_modify_add_source () {
-	test_create_repo rename-modify-add-source &&
+	git init rename-modify-add-source &&
 	(
 		cd rename-modify-add-source &&
 
@@ -91,7 +96,7 @@ test_expect_failure 'rename/modify/add-source conflict resolvable' '
 '
 
 test_setup_break_detection_1 () {
-	test_create_repo break-detection-1 &&
+	git init break-detection-1 &&
 	(
 		cd break-detection-1 &&
 
@@ -139,7 +144,7 @@ test_expect_failure 'conflict caused if rename not detected' '
 '
 
 test_setup_break_detection_2 () {
-	test_create_repo break-detection-2 &&
+	git init break-detection-2 &&
 	(
 		cd break-detection-2 &&
 
@@ -187,7 +192,7 @@ test_expect_failure 'missed conflict if rename not detected' '
 #   Commit C: rename a->b, add unrelated a
 
 test_setup_break_detection_3 () {
-	test_create_repo break-detection-3 &&
+	git init break-detection-3 &&
 	(
 		cd break-detection-3 &&
 
@@ -263,7 +268,7 @@ test_expect_failure 'detect rename/add-source and preserve all data, merge other
 '
 
 test_setup_rename_directory () {
-	test_create_repo rename-directory-$1 &&
+	git init rename-directory-$1 &&
 	(
 		cd rename-directory-$1 &&
 
@@ -312,15 +317,18 @@ test_expect_success 'rename/directory conflict + clean content merge' '
 		git ls-files -u >out &&
 		test_line_count = 1 out &&
 		git ls-files -o >out &&
-		test_line_count = 2 out &&
+		if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+		then
+			test_line_count = 1 out
+		else
+			test_line_count = 2 out
+		fi &&
 
 		echo 0 >expect &&
 		git cat-file -p base:file >>expect &&
 		echo 7 >>expect &&
 		test_cmp expect newfile~HEAD &&
 
-		test $(git rev-parse :2:newfile) = $(git hash-object expect) &&
-
 		test_path_is_file newfile/realfile &&
 		test_path_is_file newfile~HEAD
 	)
@@ -343,7 +351,12 @@ test_expect_success 'rename/directory conflict + content merge conflict' '
 		git ls-files -u >out &&
 		test_line_count = 3 out &&
 		git ls-files -o >out &&
-		test_line_count = 2 out &&
+		if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+		then
+			test_line_count = 1 out
+		else
+			test_line_count = 2 out
+		fi &&
 
 		git cat-file -p left-conflict:newfile >left &&
 		git cat-file -p base:file    >base &&
@@ -355,10 +368,16 @@ test_expect_success 'rename/directory conflict + content merge conflict' '
 			left base right &&
 		test_cmp left newfile~HEAD &&
 
-		git rev-parse >expect                                 \
-			base:file   left-conflict:newfile  right:file &&
-		git rev-parse >actual                                 \
-			:1:newfile  :2:newfile             :3:newfile &&
+		git rev-parse >expect   \
+			base:file       left-conflict:newfile right:file &&
+		if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+		then
+			git rev-parse >actual \
+				:1:newfile~HEAD :2:newfile~HEAD :3:newfile~HEAD
+		else
+			git rev-parse >actual \
+				:1:newfile      :2:newfile      :3:newfile
+		fi &&
 		test_cmp expect actual &&
 
 		test_path_is_file newfile/realfile &&
@@ -367,7 +386,7 @@ test_expect_success 'rename/directory conflict + content merge conflict' '
 '
 
 test_setup_rename_directory_2 () {
-	test_create_repo rename-directory-2 &&
+	git init rename-directory-2 &&
 	(
 		cd rename-directory-2 &&
 
@@ -426,7 +445,7 @@ test_expect_success 'disappearing dir in rename/directory conflict handled' '
 #   Commit B: modify a, add different b
 
 test_setup_rename_with_content_merge_and_add () {
-	test_create_repo rename-with-content-merge-and-add-$1 &&
+	git init rename-with-content-merge-and-add-$1 &&
 	(
 		cd rename-with-content-merge-and-add-$1 &&
 
@@ -457,7 +476,7 @@ test_expect_success 'handle rename-with-content-merge vs. add' '
 		git checkout A^0 &&
 
 		test_must_fail git merge -s recursive B^0 >out &&
-		test_i18ngrep "CONFLICT (rename/add)" out &&
+		test_grep "CONFLICT (.*/add)" out &&
 
 		git ls-files -s >out &&
 		test_line_count = 2 out &&
@@ -503,7 +522,7 @@ test_expect_success 'handle rename-with-content-merge vs. add, merge other way'
 		git checkout B^0 &&
 
 		test_must_fail git merge -s recursive A^0 >out &&
-		test_i18ngrep "CONFLICT (rename/add)" out &&
+		test_grep "CONFLICT (.*/add)" out &&
 
 		git ls-files -s >out &&
 		test_line_count = 2 out &&
@@ -551,7 +570,7 @@ test_expect_success 'handle rename-with-content-merge vs. add, merge other way'
 #   * Nothing else should be present.  Is anything?
 
 test_setup_rename_rename_2to1 () {
-	test_create_repo rename-rename-2to1 &&
+	git init rename-rename-2to1 &&
 	(
 		cd rename-rename-2to1 &&
 
@@ -583,7 +602,7 @@ test_expect_success 'handle rename/rename (2to1) conflict correctly' '
 		git checkout B^0 &&
 
 		test_must_fail git merge -s recursive C^0 >out &&
-		test_i18ngrep "CONFLICT (rename/rename)" out &&
+		test_grep "CONFLICT (\(.*\)/\1)" out &&
 
 		git ls-files -s >out &&
 		test_line_count = 2 out &&
@@ -623,7 +642,7 @@ test_expect_success 'handle rename/rename (2to1) conflict correctly' '
 #   Commit B: rename a->b
 #   Commit C: rename a->c
 test_setup_rename_rename_1to2 () {
-	test_create_repo rename-rename-1to2 &&
+	git init rename-rename-1to2 &&
 	(
 		cd rename-rename-1to2 &&
 
@@ -681,7 +700,7 @@ test_expect_success 'merge has correct working tree contents' '
 # Merging of B & C should NOT be clean; there's a rename/rename conflict
 
 test_setup_rename_rename_1to2_add_source_1 () {
-	test_create_repo rename-rename-1to2-add-source-1 &&
+	git init rename-rename-1to2-add-source-1 &&
 	(
 		cd rename-rename-1to2-add-source-1 &&
 
@@ -729,7 +748,7 @@ test_expect_failure 'detect conflict with rename/rename(1to2)/add-source merge'
 '
 
 test_setup_rename_rename_1to2_add_source_2 () {
-	test_create_repo rename-rename-1to2-add-source-2 &&
+	git init rename-rename-1to2-add-source-2 &&
 	(
 		cd rename-rename-1to2-add-source-2 &&
 
@@ -775,7 +794,7 @@ test_expect_failure 'rename/rename/add-source still tracks new a file' '
 '
 
 test_setup_rename_rename_1to2_add_dest () {
-	test_create_repo rename-rename-1to2-add-dest &&
+	git init rename-rename-1to2-add-dest &&
 	(
 		cd rename-rename-1to2-add-dest &&
 
@@ -855,7 +874,7 @@ test_expect_success 'rename/rename/add-dest merge still knows about conflicting
 #   Expected: CONFLICT (rename/add/delete), two-way merged bar
 
 test_setup_rad () {
-	test_create_repo rad &&
+	git init rad &&
 	(
 		cd rad &&
 		echo "original file" >foo &&
@@ -878,7 +897,7 @@ test_setup_rad () {
 	)
 }
 
-test_expect_failure 'rad-check: rename/add/delete conflict' '
+test_expect_merge_algorithm failure success 'rad-check: rename/add/delete conflict' '
 	test_setup_rad &&
 	(
 		cd rad &&
@@ -886,12 +905,17 @@ test_expect_failure 'rad-check: rename/add/delete conflict' '
 		git checkout B^0 &&
 		test_must_fail git merge -s recursive A^0 >out 2>err &&
 
-		# Not sure whether the output should contain just one
-		# "CONFLICT (rename/add/delete)" line, or if it should break
-		# it into a pair of "CONFLICT (rename/delete)" and
-		# "CONFLICT (rename/add)"; allow for either.
-		test_i18ngrep "CONFLICT (rename.*add)" out &&
-		test_i18ngrep "CONFLICT (rename.*delete)" out &&
+		# Instead of requiring the output to contain one combined line
+		#   CONFLICT (rename/add/delete)
+		# or perhaps two lines:
+		#   CONFLICT (rename/add): new file collides with rename target
+		#   CONFLICT (rename/delete): rename source removed on other side
+		# and instead of requiring "rename/add" instead of "add/add",
+		# be flexible in the type of console output message(s) reported
+		# for this particular case; we will be more stringent about the
+		# contents of the index and working directory.
+		test_grep "CONFLICT (.*/add)" out &&
+		test_grep "CONFLICT (rename.*/delete)" out &&
 		test_must_be_empty err &&
 
 		git ls-files -s >file_count &&
@@ -899,14 +923,14 @@ test_expect_failure 'rad-check: rename/add/delete conflict' '
 		git ls-files -u >file_count &&
 		test_line_count = 2 file_count &&
 		git ls-files -o >file_count &&
-		test_line_count = 2 file_count &&
+		test_line_count = 3 file_count &&
 
 		git rev-parse >actual \
 			:2:bar :3:bar &&
 		git rev-parse >expect \
 			B:bar  A:bar  &&
 
-		test_cmp file_is_missing foo &&
+		test_path_is_missing foo &&
 		# bar should have two-way merged contents of the different
 		# versions of bar; check that content from both sides is
 		# present.
@@ -922,7 +946,7 @@ test_expect_failure 'rad-check: rename/add/delete conflict' '
 #   Expected: CONFLICT (rename/rename/delete/delete), two-way merged baz
 
 test_setup_rrdd () {
-	test_create_repo rrdd &&
+	git init rrdd &&
 	(
 		cd rrdd &&
 		echo foo >foo &&
@@ -946,7 +970,7 @@ test_setup_rrdd () {
 	)
 }
 
-test_expect_failure 'rrdd-check: rename/rename(2to1)/delete/delete conflict' '
+test_expect_merge_algorithm failure success 'rrdd-check: rename/rename(2to1)/delete/delete conflict' '
 	test_setup_rrdd &&
 	(
 		cd rrdd &&
@@ -954,12 +978,18 @@ test_expect_failure 'rrdd-check: rename/rename(2to1)/delete/delete conflict' '
 		git checkout A^0 &&
 		test_must_fail git merge -s recursive B^0 >out 2>err &&
 
-		# Not sure whether the output should contain just one
-		# "CONFLICT (rename/rename/delete/delete)" line, or if it
-		# should break it into three: "CONFLICT (rename/rename)" and
-		# two "CONFLICT (rename/delete)" lines; allow for either.
-		test_i18ngrep "CONFLICT (rename/rename)" out &&
-		test_i18ngrep "CONFLICT (rename.*delete)" out &&
+		# Instead of requiring the output to contain one combined line
+		#   CONFLICT (rename/rename/delete/delete)
+		# or perhaps two lines:
+		#   CONFLICT (rename/rename): ...
+		#   CONFLICT (rename/delete): info about pair 1
+		#   CONFLICT (rename/delete): info about pair 2
+		# and instead of requiring "rename/rename" instead of "add/add",
+		# be flexible in the type of console output message(s) reported
+		# for this particular case; we will be more stringent about the
+		# contents of the index and working directory.
+		test_grep "CONFLICT (\(.*\)/\1)" out &&
+		test_grep "CONFLICT (rename.*delete)" out &&
 		test_must_be_empty err &&
 
 		git ls-files -s >file_count &&
@@ -967,15 +997,15 @@ test_expect_failure 'rrdd-check: rename/rename(2to1)/delete/delete conflict' '
 		git ls-files -u >file_count &&
 		test_line_count = 2 file_count &&
 		git ls-files -o >file_count &&
-		test_line_count = 2 file_count &&
+		test_line_count = 3 file_count &&
 
 		git rev-parse >actual \
 			:2:baz :3:baz &&
 		git rev-parse >expect \
 			O:foo  O:bar  &&
 
-		test_cmp file_is_missing foo &&
-		test_cmp file_is_missing bar &&
+		test_path_is_missing foo &&
+		test_path_is_missing bar &&
 		# baz should have two-way merged contents of the original
 		# contents of foo and bar; check that content from both sides
 		# is present.
@@ -992,7 +1022,7 @@ test_expect_failure 'rrdd-check: rename/rename(2to1)/delete/delete conflict' '
 #             multi-way merged contents found in two, four, six
 
 test_setup_mod6 () {
-	test_create_repo mod6 &&
+	git init mod6 &&
 	(
 		cd mod6 &&
 		test_seq 11 19 >one &&
@@ -1029,7 +1059,7 @@ test_setup_mod6 () {
 	)
 }
 
-test_expect_failure 'mod6-check: chains of rename/rename(1to2) and rename/rename(2to1)' '
+test_expect_merge_algorithm failure success 'mod6-check: chains of rename/rename(1to2) and rename/rename(2to1)' '
 	test_setup_mod6 &&
 	(
 		cd mod6 &&
@@ -1038,29 +1068,29 @@ test_expect_failure 'mod6-check: chains of rename/rename(1to2) and rename/rename
 
 		test_must_fail git merge -s recursive B^0 >out 2>err &&
 
-		test_i18ngrep "CONFLICT (rename/rename)" out &&
+		test_grep "CONFLICT (rename/rename)" out &&
 		test_must_be_empty err &&
 
 		git ls-files -s >file_count &&
-		test_line_count = 6 file_count &&
+		test_line_count = 9 file_count &&
 		git ls-files -u >file_count &&
-		test_line_count = 6 file_count &&
+		test_line_count = 9 file_count &&
 		git ls-files -o >file_count &&
 		test_line_count = 3 file_count &&
 
 		test_seq 10 20 >merged-one &&
 		test_seq 51 60 >merged-five &&
 		# Determine what the merge of three would give us.
-		test_seq 30 40 >three-side-A &&
+		test_seq 31 39 >three-base &&
+		test_seq 31 40 >three-side-A &&
 		test_seq 31 39 >three-side-B &&
-		echo forty >three-side-B &&
-		>empty &&
+		echo forty >>three-side-B &&
 		test_must_fail git merge-file \
-			-L "HEAD" \
+			-L "HEAD:four" \
 			-L "" \
-			-L "B^0" \
-			three-side-A empty three-side-B &&
-		sed -e "s/^\([<=>]\)/\1\1\1/" three-side-A >merged-three &&
+			-L "B^0:two" \
+			three-side-A three-base three-side-B &&
+		sed -e "s/^\([<=>]\)/\1\1/" three-side-A >merged-three &&
 
 		# Verify the index is as expected
 		git rev-parse >actual         \
@@ -1075,6 +1105,7 @@ test_expect_failure 'mod6-check: chains of rename/rename(1to2) and rename/rename
 
 		git cat-file -p :2:two >expect &&
 		git cat-file -p :3:two >other &&
+		>empty &&
 		test_must_fail git merge-file    \
 			-L "HEAD"  -L ""  -L "B^0" \
 			expect     empty  other &&
@@ -1103,7 +1134,7 @@ test_conflicts_with_adds_and_renames() {
 	# Setup:
 	#          L
 	#         / \
-	#   master   ?
+	#     main   ?
 	#         \ /
 	#          R
 	#
@@ -1128,8 +1159,7 @@ test_conflicts_with_adds_and_renames() {
 	#   4) There should not be any three~* files in the working
 	#      tree
 	test_setup_collision_conflict () {
-	#test_expect_success "setup simple $sideL/$sideR conflict" '
-		test_create_repo simple_${sideL}_${sideR} &&
+		git init simple_${sideL}_${sideR} &&
 		(
 			cd simple_${sideL}_${sideR} &&
 
@@ -1205,7 +1235,6 @@ test_conflicts_with_adds_and_renames() {
 			fi &&
 			test_tick && git commit -m R
 		)
-	#'
 	}
 
 	test_expect_success "check simple $sideL/$sideR conflict" '
@@ -1233,7 +1262,7 @@ test_conflicts_with_adds_and_renames() {
 				:2:three           \
 				:3:three           &&
 			git rev-parse >expected        \
-				master:irrelevant_file \
+				main:irrelevant_file \
 				file_v2                \
 				file_v4                &&
 			test_cmp expected actual &&
@@ -1263,12 +1292,12 @@ test_conflicts_with_adds_and_renames add    add
 # Setup:
 #          L
 #         / \
-#   master   ?
+#     main   ?
 #         \ /
 #          R
 #
 # Where:
-#   master has two files, named 'one' and 'two'.
+#   main has two files, named 'one' and 'two'.
 #   branches L and R both modify 'one', in conflicting ways.
 #   branches L and R both modify 'two', in conflicting ways.
 #   branch L also renames 'one' to 'three'.
@@ -1277,7 +1306,7 @@ test_conflicts_with_adds_and_renames add    add
 #   So, we have four different conflicting files that all end up at path
 #   'three'.
 test_setup_nested_conflicts_from_rename_rename () {
-	test_create_repo nested_conflicts_from_rename_rename &&
+	git init nested_conflicts_from_rename_rename &&
 	(
 		cd nested_conflicts_from_rename_rename &&
 
@@ -1349,7 +1378,7 @@ test_expect_success 'check nested conflicts from rename/rename(2to1)' '
 		test_line_count = 1 out &&
 
 		# Compare :2:three to expected values
-		git cat-file -p master:one >base &&
+		git cat-file -p main:one >base &&
 		git cat-file -p L:three >ours &&
 		git cat-file -p R:one >theirs &&
 		test_must_fail git merge-file    \
@@ -1360,7 +1389,7 @@ test_expect_success 'check nested conflicts from rename/rename(2to1)' '
 		test_cmp expect L-three &&
 
 		# Compare :2:three to expected values
-		git cat-file -p master:two >base &&
+		git cat-file -p main:two >base &&
 		git cat-file -p L:two >ours &&
 		git cat-file -p R:three >theirs &&
 		test_must_fail git merge-file    \
@@ -1386,7 +1415,7 @@ test_expect_success 'check nested conflicts from rename/rename(2to1)' '
 #   Expected: CONFLICT(rename/rename) message, three unstaged entries in the
 #             index, and contents of orig-[AB] at path orig-[AB]
 test_setup_rename_rename_1_to_2_binary () {
-	test_create_repo rename_rename_1_to_2_binary &&
+	git init rename_rename_1_to_2_binary &&
 	(
 		cd rename_rename_1_to_2_binary &&
 
diff --git a/t/t6043-merge-rename-directories.sh b/t/t6423-merge-rename-directories.sh
index 83792c5..88d1cf2 100755
--- a/t/t6043-merge-rename-directories.sh
+++ b/t/t6423-merge-rename-directories.sh
@@ -26,6 +26,7 @@ test_description="recursive merge with directory renames"
 #                     files that might be renamed into each other's paths.)
 
 . ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-merge.sh
 
 
 ###########################################################################
@@ -39,7 +40,7 @@ test_description="recursive merge with directory renames"
 #   Expected: y/{b,c,d,e/f}
 
 test_setup_1a () {
-	test_create_repo 1a &&
+	git init 1a &&
 	(
 		cd 1a &&
 
@@ -105,7 +106,7 @@ test_expect_success '1a: Simple directory rename detection' '
 #   Expected: y/{b,c,d,e}
 
 test_setup_1b () {
-	test_create_repo 1b &&
+	git init 1b &&
 	(
 		cd 1b &&
 
@@ -168,7 +169,7 @@ test_expect_success '1b: Merge a directory with another' '
 #   Expected: y/{b,c,d}  (because x/d -> z/d -> y/d)
 
 test_setup_1c () {
-	test_create_repo 1c &&
+	git init 1c &&
 	(
 		cd 1c &&
 
@@ -231,7 +232,7 @@ test_expect_success '1c: Transitive renaming' '
 #         y/wham_1 & z/wham_2 should too...giving us a conflict.
 
 test_setup_1d () {
-	test_create_repo 1d &&
+	git init 1d &&
 	(
 		cd 1d &&
 
@@ -275,7 +276,7 @@ test_expect_success '1d: Directory renames cause a rename/rename(2to1) conflict'
 		git checkout A^0 &&
 
 		test_must_fail git -c merge.directoryRenames=true merge -s recursive B^0 >out &&
-		test_i18ngrep "CONFLICT (rename/rename)" out &&
+		test_grep "CONFLICT (\(.*\)/\1)" out &&
 
 		git ls-files -s >out &&
 		test_line_count = 8 out &&
@@ -301,11 +302,20 @@ test_expect_success '1d: Directory renames cause a rename/rename(2to1) conflict'
 		git cat-file -p :2:x/wham >expect &&
 		git cat-file -p :3:x/wham >other &&
 		>empty &&
-		test_must_fail git merge-file \
-			-L "HEAD" \
-			-L "" \
-			-L "B^0" \
-			expect empty other &&
+		if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+		then
+			test_must_fail git merge-file \
+				-L "HEAD:y/wham" \
+				-L "" \
+				-L "B^0:z/wham" \
+				expect empty other
+		else
+			test_must_fail git merge-file \
+				-L "HEAD" \
+				-L "" \
+				-L "B^0" \
+				expect empty other
+		fi &&
 		test_cmp expect x/wham
 	)
 '
@@ -318,7 +328,7 @@ test_expect_success '1d: Directory renames cause a rename/rename(2to1) conflict'
 #   Expected: y/{newb,newc,d}
 
 test_setup_1e () {
-	test_create_repo 1e &&
+	git init 1e &&
 	(
 		cd 1e &&
 
@@ -377,7 +387,7 @@ test_expect_success '1e: Renamed directory, with all files being renamed too' '
 #   Expected: y/{b,c}, x/{d,e,f,g}
 
 test_setup_1f () {
-	test_create_repo 1f &&
+	git init 1f &&
 	(
 		cd 1f &&
 
@@ -444,7 +454,7 @@ test_expect_success '1f: Split a directory into two other directories' '
 #   the directory renamed, but the files within it. (see 1b)
 #
 #   If renames split a directory into two or more others, the directory
-#   with the most renames, "wins" (see 1c).  However, see the testcases
+#   with the most renames, "wins" (see 1f).  However, see the testcases
 #   in section 2, plus testcases 3a and 4a.
 ###########################################################################
 
@@ -466,7 +476,7 @@ test_expect_success '1f: Split a directory into two other directories' '
 #   Commit B: z/{b,c,d}
 #   Expected: y/b, w/c, z/d, with warning about z/ -> (y/ vs. w/) conflict
 test_setup_2a () {
-	test_create_repo 2a &&
+	git init 2a &&
 	(
 		cd 2a &&
 
@@ -505,7 +515,7 @@ test_expect_success '2a: Directory split into two on one side, with equal number
 		git checkout A^0 &&
 
 		test_must_fail git -c merge.directoryRenames=true merge -s recursive B^0 >out &&
-		test_i18ngrep "CONFLICT.*directory rename split" out &&
+		test_grep "CONFLICT.*directory rename split" out &&
 
 		git ls-files -s >out &&
 		test_line_count = 3 out &&
@@ -528,7 +538,7 @@ test_expect_success '2a: Directory split into two on one side, with equal number
 #   Commit B: z/{b,c}, x/d
 #   Expected: y/b, w/c, x/d; No warning about z/ -> (y/ vs. w/) conflict
 test_setup_2b () {
-	test_create_repo 2b &&
+	git init 2b &&
 	(
 		cd 2b &&
 
@@ -581,7 +591,7 @@ test_expect_success '2b: Directory split into two on one side, with equal number
 		git rev-parse >expect \
 			 O:z/b  O:z/c  B:x/d &&
 		test_cmp expect actual &&
-		test_i18ngrep ! "CONFLICT.*directory rename split" out
+		test_grep ! "CONFLICT.*directory rename split" out
 	)
 '
 
@@ -610,7 +620,7 @@ test_expect_success '2b: Directory split into two on one side, with equal number
 #   Commit B: y/{b,c}, x/d
 #   Expected: y/{b,c}, x/d
 test_setup_3a () {
-	test_create_repo 3a &&
+	git init 3a &&
 	(
 		cd 3a &&
 
@@ -674,7 +684,7 @@ test_expect_success '3a: Avoid implicit rename if involved as source on other si
 #         end up with CONFLICT:(z/d -> y/d vs. x/d vs. w/d), i.e. a
 #         rename/rename/rename(1to3) conflict, which is just weird.
 test_setup_3b () {
-	test_create_repo 3b &&
+	git init 3b &&
 	(
 		cd 3b &&
 
@@ -716,8 +726,8 @@ test_expect_success '3b: Avoid implicit rename if involved as source on current
 		git checkout A^0 &&
 
 		test_must_fail git -c merge.directoryRenames=true merge -s recursive B^0 >out &&
-		test_i18ngrep CONFLICT.*rename/rename.*z/d.*x/d.*w/d out &&
-		test_i18ngrep ! CONFLICT.*rename/rename.*y/d out &&
+		test_grep CONFLICT.*rename/rename.*z/d.*x/d.*w/d out &&
+		test_grep ! CONFLICT.*rename/rename.*y/d out &&
 
 		git ls-files -s >out &&
 		test_line_count = 5 out &&
@@ -797,7 +807,7 @@ test_expect_success '3b: Avoid implicit rename if involved as source on current
 #   NOTE: Even though most files from z moved to y, we don't want f to follow.
 
 test_setup_4a () {
-	test_create_repo 4a &&
+	git init 4a &&
 	(
 		cd 4a &&
 
@@ -886,7 +896,7 @@ test_expect_success '4a: Directory split, with original directory still present'
 #         index.
 
 test_setup_5a () {
-	test_create_repo 5a &&
+	git init 5a &&
 	(
 		cd 5a &&
 
@@ -928,7 +938,7 @@ test_expect_success '5a: Merge directories, other side adds files to original an
 		git checkout A^0 &&
 
 		test_must_fail git -c merge.directoryRenames=true merge -s recursive B^0 >out &&
-		test_i18ngrep "CONFLICT.*implicit dir rename" out &&
+		test_grep "CONFLICT.*implicit dir rename" out &&
 
 		git ls-files -s >out &&
 		test_line_count = 6 out &&
@@ -961,7 +971,7 @@ test_expect_success '5a: Merge directories, other side adds files to original an
 #         back to git behavior without the directory rename detection.
 
 test_setup_5b () {
-	test_create_repo 5b &&
+	git init 5b &&
 	(
 		cd 5b &&
 
@@ -1003,7 +1013,7 @@ test_expect_success '5b: Rename/delete in order to get add/add/add conflict' '
 		git checkout A^0 &&
 
 		test_must_fail git -c merge.directoryRenames=true merge -s recursive B^0 >out &&
-		test_i18ngrep "CONFLICT (add/add).* y/d" out &&
+		test_grep "CONFLICT (add/add).* y/d" out &&
 
 		git ls-files -s >out &&
 		test_line_count = 5 out &&
@@ -1038,7 +1048,7 @@ test_expect_success '5b: Rename/delete in order to get add/add/add conflict' '
 #             though, because it doesn't have anything in the way.
 
 test_setup_5c () {
-	test_create_repo 5c &&
+	git init 5c &&
 	(
 		cd 5c &&
 
@@ -1084,8 +1094,8 @@ test_expect_success '5c: Transitive rename would cause rename/rename/rename/add/
 		git checkout A^0 &&
 
 		test_must_fail git -c merge.directoryRenames=true merge -s recursive B^0 >out &&
-		test_i18ngrep "CONFLICT (rename/rename).*x/d.*w/d.*z/d" out &&
-		test_i18ngrep "CONFLICT (add/add).* y/d" out &&
+		test_grep "CONFLICT (rename/rename).*x/d.*w/d.*z/d" out &&
+		test_grep "CONFLICT (add/add).* y/d" out &&
 
 		git ls-files -s >out &&
 		test_line_count = 9 out &&
@@ -1128,7 +1138,7 @@ test_expect_success '5c: Transitive rename would cause rename/rename/rename/add/
 #         directory rename detection for z/f -> y/f.
 
 test_setup_5d () {
-	test_create_repo 5d &&
+	git init 5d &&
 	(
 		cd 5d &&
 
@@ -1169,17 +1179,25 @@ test_expect_success '5d: Directory/file/file conflict due to directory rename' '
 		git checkout A^0 &&
 
 		test_must_fail git -c merge.directoryRenames=true merge -s recursive B^0 >out &&
-		test_i18ngrep "CONFLICT (file/directory).*y/d" out &&
+		test_grep "CONFLICT (file/directory).*y/d" out &&
 
 		git ls-files -s >out &&
 		test_line_count = 6 out &&
 		git ls-files -u >out &&
 		test_line_count = 1 out &&
 		git ls-files -o >out &&
-		test_line_count = 2 out &&
-
-		git rev-parse >actual \
-			:0:y/b :0:y/c :0:z/d :0:y/f :2:y/d :0:y/d/e &&
+		if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+		then
+			test_line_count = 1 out &&
+
+			git rev-parse >actual \
+			    :0:y/b :0:y/c :0:z/d :0:y/f :2:y/d~HEAD :0:y/d/e
+		else
+			test_line_count = 2 out &&
+
+			git rev-parse >actual \
+			    :0:y/b :0:y/c :0:z/d :0:y/f :2:y/d      :0:y/d/e
+		fi &&
 		git rev-parse >expect \
 			 O:z/b  O:z/c  B:z/d  B:z/f  A:y/d  B:y/d/e &&
 		test_cmp expect actual &&
@@ -1221,7 +1239,7 @@ test_expect_success '5d: Directory/file/file conflict due to directory rename' '
 #         it is also involved in a rename/delete conflict.
 
 test_setup_6a () {
-	test_create_repo 6a &&
+	git init 6a &&
 	(
 		cd 6a &&
 
@@ -1260,37 +1278,146 @@ test_expect_success '6a: Tricky rename/delete' '
 		git checkout A^0 &&
 
 		test_must_fail git -c merge.directoryRenames=true merge -s recursive B^0 >out &&
-		test_i18ngrep "CONFLICT (rename/delete).*z/c.*y/c" out &&
+		test_grep "CONFLICT (rename/delete).*z/c.*y/c" out &&
+
+		if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+		then
+			git ls-files -s >out &&
+			test_line_count = 3 out &&
+			git ls-files -u >out &&
+			test_line_count = 2 out &&
+			git ls-files -o >out &&
+			test_line_count = 1 out &&
+
+			git rev-parse >actual \
+				:0:y/b :1:y/c :3:y/c &&
+			git rev-parse >expect \
+				 O:z/b  O:z/c  O:z/c
+		else
+			git ls-files -s >out &&
+			test_line_count = 2 out &&
+			git ls-files -u >out &&
+			test_line_count = 1 out &&
+			git ls-files -o >out &&
+			test_line_count = 1 out &&
+
+			git rev-parse >actual \
+				:0:y/b :3:y/c &&
+			git rev-parse >expect \
+				 O:z/b  O:z/c
+		fi &&
+		test_cmp expect actual
+	)
+'
+
+# Testcase 6b1, Same rename done on both sides
+#   (Related to testcase 6b2 and 8e)
+#   Commit O: z/{b,c,d,e}
+#   Commit A: y/{b,c,d}, x/e
+#   Commit B: y/{b,c,d}, z/{e,f}
+#   Expected: y/{b,c,d,f}, x/e
+#   Note: Directory rename detection says A renamed z/ -> y/ (3 paths renamed
+#         to y/ and only 1 renamed to x/), therefore the new file 'z/f' in B
+#         should be moved to 'y/f'.
+#
+#         This is a bit of an edge case where any behavior might surprise users,
+#         whether that is treating A as renaming z/ -> y/, treating A as renaming
+#         z/ -> x/, or treating A as not doing any directory rename.  However, I
+#         think this answer is the least confusing and most consistent with the
+#         rules elsewhere.
+#
+#         A note about z/ -> x/, since it may not be clear how that could come
+#         about: If we were to ignore files renamed by both sides
+#         (i.e. z/{b,c,d}), as directory rename detection did in git-2.18 thru
+#         at least git-2.28, then we would note there are no renames from z/ to
+#         y/ and one rename from z/ to x/ and thus come to the conclusion that
+#         A renamed z/ -> x/.  This seems more confusing for end users than a
+#         rename of z/ to y/, it makes directory rename detection behavior
+#         harder for them to predict.  As such, we modified the rule, changed
+#         the behavior on testcases 6b2 and 8e, and introduced this 6b1 testcase.
+
+test_setup_6b1 () {
+	git init 6b1 &&
+	(
+		cd 6b1 &&
+
+		mkdir z &&
+		echo b >z/b &&
+		echo c >z/c &&
+		echo d >z/d &&
+		echo e >z/e &&
+		git add z &&
+		test_tick &&
+		git commit -m "O" &&
+
+		git branch O &&
+		git branch A &&
+		git branch B &&
+
+		git checkout A &&
+		git mv z y &&
+		mkdir x &&
+		git mv y/e x/e &&
+		test_tick &&
+		git commit -m "A" &&
+
+		git checkout B &&
+		git mv z y &&
+		mkdir z &&
+		git mv y/e z/e &&
+		echo f >z/f &&
+		git add z/f &&
+		test_tick &&
+		git commit -m "B"
+	)
+}
+
+test_expect_merge_algorithm failure success '6b1: Same renames done on both sides, plus another rename' '
+	test_setup_6b1 &&
+	(
+		cd 6b1 &&
+
+		git checkout A^0 &&
+
+		git -c merge.directoryRenames=true merge -s recursive B^0 &&
 
 		git ls-files -s >out &&
-		test_line_count = 2 out &&
+		test_line_count = 5 out &&
 		git ls-files -u >out &&
-		test_line_count = 1 out &&
+		test_line_count = 0 out &&
 		git ls-files -o >out &&
 		test_line_count = 1 out &&
 
 		git rev-parse >actual \
-			:0:y/b :3:y/c &&
+			HEAD:y/b HEAD:y/c HEAD:y/d HEAD:x/e HEAD:y/f &&
 		git rev-parse >expect \
-			 O:z/b  O:z/c &&
+			O:z/b    O:z/c    O:z/d    O:z/e    B:z/f &&
 		test_cmp expect actual
 	)
 '
 
-# Testcase 6b, Same rename done on both sides
+# Testcase 6b2, Same rename done on both sides
 #   (Related to testcases 6c and 8e)
 #   Commit O: z/{b,c}
 #   Commit A: y/{b,c}
 #   Commit B: y/{b,c}, z/d
-#   Expected: y/{b,c}, z/d
-#   Note: If we did directory rename detection here, we'd move z/d into y/,
-#         but B did that rename and still decided to put the file into z/,
-#         so we probably shouldn't apply directory rename detection for it.
-
-test_setup_6b () {
-	test_create_repo 6b &&
+#   Expected: y/{b,c,d}
+#   Alternate: y/{b,c}, z/d
+#   Note: Directory rename detection says A renamed z/ -> y/, therefore the new
+#         file 'z/d' in B should be moved to 'y/d'.
+#
+#         We could potentially ignore the renames of z/{b,c} on side A since
+#         those were renamed on both sides.  However, it's a bit of a corner
+#         case because what if there was also a z/e that side A moved to x/e
+#         and side B left alone?  If we used the "ignore renames done on both
+#         sides" logic, then we'd compute that A renamed z/ -> x/, and move
+#         z/d to x/d.  That seems more surprising and uglier than allowing
+#         the z/ -> y/ rename.
+
+test_setup_6b2 () {
+	git init 6b2 &&
 	(
-		cd 6b &&
+		cd 6b2 &&
 
 		mkdir z &&
 		echo b >z/b &&
@@ -1318,10 +1445,10 @@ test_setup_6b () {
 	)
 }
 
-test_expect_success '6b: Same rename done on both sides' '
-	test_setup_6b &&
+test_expect_merge_algorithm failure success '6b2: Same rename done on both sides' '
+	test_setup_6b2 &&
 	(
-		cd 6b &&
+		cd 6b2 &&
 
 		git checkout A^0 &&
 
@@ -1335,7 +1462,7 @@ test_expect_success '6b: Same rename done on both sides' '
 		test_line_count = 1 out &&
 
 		git rev-parse >actual \
-			HEAD:y/b HEAD:y/c HEAD:z/d &&
+			HEAD:y/b HEAD:y/c HEAD:y/d &&
 		git rev-parse >expect \
 			O:z/b    O:z/c    B:z/d &&
 		test_cmp expect actual
@@ -1343,7 +1470,7 @@ test_expect_success '6b: Same rename done on both sides' '
 '
 
 # Testcase 6c, Rename only done on same side
-#   (Related to testcases 6b and 8e)
+#   (Related to testcases 6b1, 6b2, and 8e)
 #   Commit O: z/{b,c}
 #   Commit A: z/{b,c} (no change)
 #   Commit B: y/{b,c}, z/d
@@ -1352,7 +1479,7 @@ test_expect_success '6b: Same rename done on both sides' '
 #         "accidentally detect a rename" and give us y/{b,c,d}.
 
 test_setup_6c () {
-	test_create_repo 6c &&
+	git init 6c &&
 	(
 		cd 6c &&
 
@@ -1415,7 +1542,7 @@ test_expect_success '6c: Rename only done on same side' '
 #         doesn't "accidentally detect a rename" and give us y/{b,c,d}.
 
 test_setup_6d () {
-	test_create_repo 6d &&
+	git init 6d &&
 	(
 		cd 6d &&
 
@@ -1478,7 +1605,7 @@ test_expect_success '6d: We do not always want transitive renaming' '
 #         add/add conflict on y/d_1 vs y/d_2.
 
 test_setup_6e () {
-	test_create_repo 6e &&
+	git init 6e &&
 	(
 		cd 6e &&
 
@@ -1573,7 +1700,7 @@ test_expect_success '6e: Add/add from one side' '
 #   NOTE: There's a rename of z/ here, y/ has more renames, so z/d -> y/d.
 
 test_setup_7a () {
-	test_create_repo 7a &&
+	git init 7a &&
 	(
 		cd 7a &&
 
@@ -1613,8 +1740,8 @@ test_expect_success '7a: rename-dir vs. rename-dir (NOT split evenly) PLUS add-o
 		git checkout A^0 &&
 
 		test_must_fail git -c merge.directoryRenames=true merge -s recursive B^0 >out &&
-		test_i18ngrep "CONFLICT (rename/rename).*z/b.*y/b.*w/b" out &&
-		test_i18ngrep "CONFLICT (rename/rename).*z/c.*y/c.*x/c" out &&
+		test_grep "CONFLICT (rename/rename).*z/b.*y/b.*w/b" out &&
+		test_grep "CONFLICT (rename/rename).*z/c.*y/c.*x/c" out &&
 
 		git ls-files -s >out &&
 		test_line_count = 7 out &&
@@ -1645,7 +1772,7 @@ test_expect_success '7a: rename-dir vs. rename-dir (NOT split evenly) PLUS add-o
 #   Expected: y/{b,c}, CONFLICT(rename/rename(2to1): x/d_1, w/d_2 -> y_d)
 
 test_setup_7b () {
-	test_create_repo 7b &&
+	git init 7b &&
 	(
 		cd 7b &&
 
@@ -1686,7 +1813,7 @@ test_expect_success '7b: rename/rename(2to1), but only due to transitive rename'
 		git checkout A^0 &&
 
 		test_must_fail git -c merge.directoryRenames=true merge -s recursive B^0 >out &&
-		test_i18ngrep "CONFLICT (rename/rename)" out &&
+		test_grep "CONFLICT (\(.*\)/\1)" out &&
 
 		git ls-files -s >out &&
 		test_line_count = 4 out &&
@@ -1705,11 +1832,20 @@ test_expect_success '7b: rename/rename(2to1), but only due to transitive rename'
 		git cat-file -p :2:y/d >expect &&
 		git cat-file -p :3:y/d >other &&
 		>empty &&
-		test_must_fail git merge-file \
-			-L "HEAD" \
-			-L "" \
-			-L "B^0" \
-			expect empty other &&
+		if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+		then
+			test_must_fail git merge-file \
+				-L "HEAD:y/d" \
+				-L "" \
+				-L "B^0:z/d" \
+				expect empty other
+		else
+			test_must_fail git merge-file \
+				-L "HEAD" \
+				-L "" \
+				-L "B^0" \
+				expect empty other
+		fi &&
 		test_cmp expect y/d
 	)
 '
@@ -1725,7 +1861,7 @@ test_expect_success '7b: rename/rename(2to1), but only due to transitive rename'
 #         nor CONFLiCT x/d -> w/d vs. y/d vs. z/d)
 
 test_setup_7c () {
-	test_create_repo 7c &&
+	git init 7c &&
 	(
 		cd 7c &&
 
@@ -1764,7 +1900,7 @@ test_expect_success '7c: rename/rename(1to...2or3); transitive rename may add co
 		git checkout A^0 &&
 
 		test_must_fail git -c merge.directoryRenames=true merge -s recursive B^0 >out &&
-		test_i18ngrep "CONFLICT (rename/rename).*x/d.*w/d.*y/d" out &&
+		test_grep "CONFLICT (rename/rename).*x/d.*w/d.*y/d" out &&
 
 		git ls-files -s >out &&
 		test_line_count = 5 out &&
@@ -1790,7 +1926,7 @@ test_expect_success '7c: rename/rename(1to...2or3); transitive rename may add co
 #   NOTE: z->y so NOT CONFLICT(delete x/d vs rename to z/d)
 
 test_setup_7d () {
-	test_create_repo 7d &&
+	git init 7d &&
 	(
 		cd 7d &&
 
@@ -1829,19 +1965,34 @@ test_expect_success '7d: transitive rename involved in rename/delete; how is it
 		git checkout A^0 &&
 
 		test_must_fail git -c merge.directoryRenames=true merge -s recursive B^0 >out &&
-		test_i18ngrep "CONFLICT (rename/delete).*x/d.*y/d" out &&
-
-		git ls-files -s >out &&
-		test_line_count = 3 out &&
-		git ls-files -u >out &&
-		test_line_count = 1 out &&
-		git ls-files -o >out &&
-		test_line_count = 1 out &&
-
-		git rev-parse >actual \
-			:0:y/b :0:y/c :3:y/d &&
-		git rev-parse >expect \
-			 O:z/b  O:z/c  O:x/d &&
+		test_grep "CONFLICT (rename/delete).*x/d.*y/d" out &&
+
+		if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+		then
+			git ls-files -s >out &&
+			test_line_count = 4 out &&
+			git ls-files -u >out &&
+			test_line_count = 2 out &&
+			git ls-files -o >out &&
+			test_line_count = 1 out &&
+
+			git rev-parse >actual \
+				:0:y/b :0:y/c :1:y/d :3:y/d &&
+			git rev-parse >expect \
+				 O:z/b  O:z/c  O:x/d  O:x/d
+		else
+			git ls-files -s >out &&
+			test_line_count = 3 out &&
+			git ls-files -u >out &&
+			test_line_count = 1 out &&
+			git ls-files -o >out &&
+			test_line_count = 1 out &&
+
+			git rev-parse >actual \
+				:0:y/b :0:y/c :3:y/d &&
+			git rev-parse >expect \
+				 O:z/b  O:z/c  O:x/d
+		fi &&
 		test_cmp expect actual
 	)
 '
@@ -1876,7 +2027,7 @@ test_expect_success '7d: transitive rename involved in rename/delete; how is it
 #         how it's resolved.
 
 test_setup_7e () {
-	test_create_repo 7e &&
+	git init 7e &&
 	(
 		cd 7e &&
 
@@ -1920,19 +2071,34 @@ test_expect_success '7e: transitive rename in rename/delete AND dirs in the way'
 		git checkout A^0 &&
 
 		test_must_fail git -c merge.directoryRenames=true merge -s recursive B^0 >out &&
-		test_i18ngrep "CONFLICT (rename/delete).*x/d.*y/d" out &&
-
-		git ls-files -s >out &&
-		test_line_count = 5 out &&
-		git ls-files -u >out &&
-		test_line_count = 1 out &&
-		git ls-files -o >out &&
-		test_line_count = 2 out &&
-
-		git rev-parse >actual \
-			:0:x/d/f :0:y/d/g :0:y/b :0:y/c :3:y/d &&
-		git rev-parse >expect \
-			 A:x/d/f  A:y/d/g  O:z/b  O:z/c  O:x/d &&
+		test_grep "CONFLICT (rename/delete).*x/d.*y/d" out &&
+
+		if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+		then
+			git ls-files -s >out &&
+			test_line_count = 6 out &&
+			git ls-files -u >out &&
+			test_line_count = 2 out &&
+			git ls-files -o >out &&
+			test_line_count = 1 out &&
+
+			git rev-parse >actual \
+				:0:x/d/f :0:y/d/g :0:y/b :0:y/c :1:y/d~B^0 :3:y/d~B^0 &&
+			git rev-parse >expect \
+				 A:x/d/f  A:y/d/g  O:z/b  O:z/c  O:x/d      O:x/d
+		else
+			git ls-files -s >out &&
+			test_line_count = 5 out &&
+			git ls-files -u >out &&
+			test_line_count = 1 out &&
+			git ls-files -o >out &&
+			test_line_count = 2 out &&
+
+			git rev-parse >actual \
+				:0:x/d/f :0:y/d/g :0:y/b :0:y/c :3:y/d &&
+			git rev-parse >expect \
+				 A:x/d/f  A:y/d/g  O:z/b  O:z/c  O:x/d
+		fi &&
 		test_cmp expect actual &&
 
 		git hash-object y/d~B^0 >actual &&
@@ -1971,7 +2137,7 @@ test_expect_success '7e: transitive rename in rename/delete AND dirs in the way'
 # we potentially could.
 
 test_setup_8a () {
-	test_create_repo 8a &&
+	git init 8a &&
 	(
 		cd 8a &&
 
@@ -2050,7 +2216,7 @@ test_expect_success '8a: Dual-directory rename, one into the others way' '
 # e_1 and e_2.
 
 test_setup_8b () {
-	test_create_repo 8b &&
+	git init 8b &&
 	(
 		cd 8b &&
 
@@ -2124,7 +2290,7 @@ test_expect_success '8b: Dual-directory rename, one into the others way, with co
 #         notes in 8d.
 
 test_setup_8c () {
-	test_create_repo 8c &&
+	git init 8c &&
 	(
 		cd 8c &&
 
@@ -2164,7 +2330,7 @@ test_expect_success '8c: modify/delete or rename+modify/delete' '
 		git checkout A^0 &&
 
 		test_must_fail git -c merge.directoryRenames=true merge -s recursive B^0 >out &&
-		test_i18ngrep "CONFLICT (modify/delete).* z/d" out &&
+		test_grep "CONFLICT (modify/delete).* z/d" out &&
 
 		git ls-files -s >out &&
 		test_line_count = 5 out &&
@@ -2204,7 +2370,7 @@ test_expect_success '8c: modify/delete or rename+modify/delete' '
 #   differently.
 
 test_setup_8d () {
-	test_create_repo 8d &&
+	git init 8d &&
 	(
 		cd 8d &&
 
@@ -2260,27 +2426,34 @@ test_expect_success '8d: rename/delete...or not?' '
 #   Commit B: w/{b,c}, z/d
 #
 # Possible Resolutions:
-#   w/o dir-rename detection: z/d, CONFLICT(z/b -> y/b vs. w/b),
-#                                  CONFLICT(z/c -> y/c vs. w/c)
-#   Currently expected:       y/d, CONFLICT(z/b -> y/b vs. w/b),
-#                                  CONFLICT(z/c -> y/c vs. w/c)
-#   Optimal:                  ??
+#   if z not considered renamed: z/d, CONFLICT(z/b -> y/b vs. w/b),
+#                                     CONFLICT(z/c -> y/c vs. w/c)
+#   if z->y rename considered:   y/d, CONFLICT(z/b -> y/b vs. w/b),
+#                                     CONFLICT(z/c -> y/c vs. w/c)
+#   Optimal:                     ??
 #
 # Notes: In commit A, directory z got renamed to y.  In commit B, directory z
 #        did NOT get renamed; the directory is still present; instead it is
 #        considered to have just renamed a subset of paths in directory z
-#        elsewhere.  Therefore, the directory rename done in commit A to z/
-#        applies to z/d and maps it to y/d.
+#        elsewhere.  This is much like testcase 6b2 (where commit B moves all
+#        the original paths out of z/ but opted to keep d within z/).
+#
+#        It was not clear in the past what should be done with this testcase;
+#        in fact, I noted that I "just picked one" previously.  However,
+#        following the new logic for testcase 6b2, we should take the rename
+#        and move z/d to y/d.
 #
-#        It's possible that users would get confused about this, but what
-#        should we do instead?  Silently leaving at z/d seems just as bad or
-#        maybe even worse.  Perhaps we could print a big warning about z/d
-#        and how we're moving to y/d in this case, but when I started thinking
-#        about the ramifications of doing that, I didn't know how to rule out
-#        that opening other weird edge and corner cases so I just punted.
+#        6b1, 6b2, and this case are definitely somewhat fuzzy in terms of
+#        whether they are optimal for end users, but (a) the default for
+#        directory rename detection is to mark these all as conflicts
+#        anyway, (b) it feels like this is less prone to higher order corner
+#        case confusion, and (c) the current algorithm requires less global
+#        knowledge (i.e. less coupling in the algorithm between renames done
+#        on both sides) which thus means users are better able to predict
+#        the behavior, and predict it without computing as many details.
 
 test_setup_8e () {
-	test_create_repo 8e &&
+	git init 8e &&
 	(
 		cd 8e &&
 
@@ -2318,8 +2491,8 @@ test_expect_success '8e: Both sides rename, one side adds to original directory'
 		git checkout A^0 &&
 
 		test_must_fail git -c merge.directoryRenames=true merge -s recursive B^0 >out 2>err &&
-		test_i18ngrep CONFLICT.*rename/rename.*z/c.*y/c.*w/c out &&
-		test_i18ngrep CONFLICT.*rename/rename.*z/b.*y/b.*w/b out &&
+		test_grep CONFLICT.*rename/rename.*z/c.*y/c.*w/c out &&
+		test_grep CONFLICT.*rename/rename.*z/b.*y/b.*w/b out &&
 
 		git ls-files -s >out &&
 		test_line_count = 7 out &&
@@ -2364,7 +2537,7 @@ test_expect_success '8e: Both sides rename, one side adds to original directory'
 #         of that could take the new file in commit B at z/i to x/w/i or x/i.
 
 test_setup_9a () {
-	test_create_repo 9a &&
+	git init 9a &&
 	(
 		cd 9a &&
 
@@ -2436,7 +2609,7 @@ test_expect_success '9a: Inner renamed directory within outer renamed directory'
 #   Expected: y/{b,c,d_merged}
 
 test_setup_9b () {
-	test_create_repo 9b &&
+	git init 9b &&
 	(
 		cd 9b &&
 
@@ -2524,7 +2697,7 @@ test_expect_success '9b: Transitive rename with content merge' '
 #         history for any implicit directory renames.
 
 test_setup_9c () {
-	test_create_repo 9c &&
+	git init 9c &&
 	(
 		cd 9c &&
 
@@ -2568,7 +2741,7 @@ test_expect_success '9c: Doubly transitive rename?' '
 		git checkout A^0 &&
 
 		git -c merge.directoryRenames=true merge -s recursive B^0 >out &&
-		test_i18ngrep "WARNING: Avoiding applying x -> z rename to x/f" out &&
+		test_grep "WARNING: Avoiding applying x -> z rename to x/f" out &&
 
 		git ls-files -s >out &&
 		test_line_count = 6 out &&
@@ -2613,7 +2786,7 @@ test_expect_success '9c: Doubly transitive rename?' '
 #   testcases and simplifies things for the user.
 
 test_setup_9d () {
-	test_create_repo 9d &&
+	git init 9d &&
 	(
 		cd 9d &&
 
@@ -2657,10 +2830,10 @@ test_expect_success '9d: N-way transitive rename?' '
 		git checkout A^0 &&
 
 		git -c merge.directoryRenames=true merge -s recursive B^0 >out &&
-		test_i18ngrep "WARNING: Avoiding applying z -> y rename to z/t" out &&
-		test_i18ngrep "WARNING: Avoiding applying y -> x rename to y/a" out &&
-		test_i18ngrep "WARNING: Avoiding applying x -> w rename to x/b" out &&
-		test_i18ngrep "WARNING: Avoiding applying w -> v rename to w/c" out &&
+		test_grep "WARNING: Avoiding applying z -> y rename to z/t" out &&
+		test_grep "WARNING: Avoiding applying y -> x rename to y/a" out &&
+		test_grep "WARNING: Avoiding applying x -> w rename to x/b" out &&
+		test_grep "WARNING: Avoiding applying w -> v rename to w/c" out &&
 
 		git ls-files -s >out &&
 		test_line_count = 7 out &&
@@ -2688,7 +2861,7 @@ test_expect_success '9d: N-way transitive rename?' '
 #             dir1/yo, dir2/yo, dir3/yo, dirN/yo
 
 test_setup_9e () {
-	test_create_repo 9e &&
+	git init 9e &&
 	(
 		cd 9e &&
 
@@ -2732,7 +2905,7 @@ test_setup_9e () {
 	)
 }
 
-test_expect_success C_LOCALE_OUTPUT '9e: N-to-1 whammo' '
+test_expect_success '9e: N-to-1 whammo' '
 	test_setup_9e &&
 	(
 		cd 9e &&
@@ -2781,7 +2954,7 @@ test_expect_success C_LOCALE_OUTPUT '9e: N-to-1 whammo' '
 #   Expected: priority/{a,b}/$more_files, priority/c
 
 test_setup_9f () {
-	test_create_repo 9f &&
+	git init 9f &&
 	(
 		cd 9f &&
 
@@ -2844,9 +3017,17 @@ test_expect_success '9f: Renamed directory that only contained immediate subdirs
 #   Commit A: priority/{alpha,bravo}/$more_files
 #   Commit B: goal/{a,b}/$more_files, goal/c
 #   Expected: priority/{alpha,bravo}/$more_files, priority/c
+# We currently fail this test because the directory renames we detect are
+#   goal/a/ -> priority/alpha/
+#   goal/b/ -> priority/bravo/
+# We do not detect
+#   goal/   -> priority/
+# because of no files found within goal/, and the fact that "a" != "alpha"
+# and "b" != "bravo".  But I'm not sure it's really a failure given that
+# viewpoint...
 
 test_setup_9g () {
-	test_create_repo 9g &&
+	git init 9g &&
 	(
 		cd 9g &&
 
@@ -2880,6 +3061,7 @@ test_setup_9g () {
 }
 
 test_expect_failure '9g: Renamed directory that only contained immediate subdirs, immediate subdirs renamed' '
+	test_setup_9g &&
 	(
 		cd 9g &&
 
@@ -2914,7 +3096,7 @@ test_expect_failure '9g: Renamed directory that only contained immediate subdirs
 #   NOTE: If we applied the z/ -> y/ rename to z/d, then we'd end up with
 #         a rename/rename(1to2) conflict (z/d -> y/d vs. x/d)
 test_setup_9h () {
-	test_create_repo 9h &&
+	git init 9h &&
 	(
 		cd 9h &&
 
@@ -2995,7 +3177,7 @@ test_expect_success '9h: Avoid dir rename on merely modified path' '
 #       ERROR_MSG(untracked working tree files would be overwritten by merge)
 
 test_setup_10a () {
-	test_create_repo 10a &&
+	git init 10a &&
 	(
 		cd 10a &&
 
@@ -3032,7 +3214,8 @@ test_expect_success '10a: Overwrite untracked with normal rename/delete' '
 		echo important >z/d &&
 
 		test_must_fail git -c merge.directoryRenames=true merge -s recursive B^0 >out 2>err &&
-		test_i18ngrep "The following untracked working tree files would be overwritten by merge" err &&
+		test_path_is_missing .git/MERGE_HEAD &&
+		test_grep "The following untracked working tree files would be overwritten by merge" err &&
 
 		git ls-files -s >out &&
 		test_line_count = 1 out &&
@@ -3060,7 +3243,7 @@ test_expect_success '10a: Overwrite untracked with normal rename/delete' '
 #       ERROR_MSG(refusing to lose untracked file at 'y/d')
 
 test_setup_10b () {
-	test_create_repo 10b &&
+	git init 10b &&
 	(
 		cd 10b &&
 
@@ -3101,21 +3284,34 @@ test_expect_success '10b: Overwrite untracked with dir rename + delete' '
 		echo contents >y/e &&
 
 		test_must_fail git -c merge.directoryRenames=true merge -s recursive B^0 >out 2>err &&
-		test_i18ngrep "CONFLICT (rename/delete).*Version B\^0 of y/d left in tree at y/d~B\^0" out &&
-		test_i18ngrep "Error: Refusing to lose untracked file at y/e; writing to y/e~B\^0 instead" out &&
-
-		git ls-files -s >out &&
-		test_line_count = 3 out &&
-		git ls-files -u >out &&
-		test_line_count = 2 out &&
-		git ls-files -o >out &&
-		test_line_count = 5 out &&
-
-		git rev-parse >actual \
-			:0:y/b :3:y/d :3:y/e &&
-		git rev-parse >expect \
-			O:z/b  O:z/c  B:z/e &&
-		test_cmp expect actual &&
+		if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+		then
+			test_path_is_missing .git/MERGE_HEAD &&
+			test_grep "error: The following untracked working tree files would be overwritten by merge" err &&
+
+			git ls-files -s >out &&
+			test_line_count = 1 out &&
+			git ls-files -u >out &&
+			test_line_count = 0 out &&
+			git ls-files -o >out &&
+			test_line_count = 5 out
+		else
+			test_grep "CONFLICT (rename/delete).*Version B\^0 of y/d left in tree at y/d~B\^0" out &&
+			test_grep "Error: Refusing to lose untracked file at y/e; writing to y/e~B\^0 instead" out &&
+
+			git ls-files -s >out &&
+			test_line_count = 3 out &&
+			git ls-files -u >out &&
+			test_line_count = 2 out &&
+			git ls-files -o >out &&
+			test_line_count = 5 out &&
+
+			git rev-parse >actual \
+				:0:y/b :3:y/d :3:y/e &&
+			git rev-parse >expect \
+				O:z/b  O:z/c  B:z/e &&
+			test_cmp expect actual
+		fi &&
 
 		echo very >expect &&
 		test_cmp expect y/c &&
@@ -3138,7 +3334,7 @@ test_expect_success '10b: Overwrite untracked with dir rename + delete' '
 #             ERROR_MSG(Refusing to lose untracked file at y/c)
 
 test_setup_10c () {
-	test_create_repo 10c_$1 &&
+	git init 10c_$1 &&
 	(
 		cd 10c_$1 &&
 
@@ -3178,25 +3374,38 @@ test_expect_success '10c1: Overwrite untracked with dir rename/rename(1to2)' '
 		echo important >y/c &&
 
 		test_must_fail git -c merge.directoryRenames=true merge -s recursive B^0 >out 2>err &&
-		test_i18ngrep "CONFLICT (rename/rename)" out &&
-		test_i18ngrep "Refusing to lose untracked file at y/c; adding as y/c~B\^0 instead" out &&
-
-		git ls-files -s >out &&
-		test_line_count = 6 out &&
-		git ls-files -u >out &&
-		test_line_count = 3 out &&
-		git ls-files -o >out &&
-		test_line_count = 3 out &&
-
-		git rev-parse >actual \
-			:0:y/a :0:y/b :0:x/d :1:x/c :2:w/c :3:y/c &&
-		git rev-parse >expect \
-			 O:z/a  O:z/b  O:x/d  O:x/c  O:x/c  O:x/c &&
-		test_cmp expect actual &&
-
-		git hash-object y/c~B^0 >actual &&
-		git rev-parse O:x/c >expect &&
-		test_cmp expect actual &&
+		if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+		then
+			test_path_is_missing .git/MERGE_HEAD &&
+			test_grep "error: The following untracked working tree files would be overwritten by merge" err &&
+
+			git ls-files -s >out &&
+			test_line_count = 4 out &&
+			git ls-files -u >out &&
+			test_line_count = 0 out &&
+			git ls-files -o >out &&
+			test_line_count = 3 out
+		else
+			test_grep "CONFLICT (rename/rename)" out &&
+			test_grep "Refusing to lose untracked file at y/c; adding as y/c~B\^0 instead" out &&
+
+			git ls-files -s >out &&
+			test_line_count = 6 out &&
+			git ls-files -u >out &&
+			test_line_count = 3 out &&
+			git ls-files -o >out &&
+			test_line_count = 3 out &&
+
+			git rev-parse >actual \
+				:0:y/a :0:y/b :0:x/d :1:x/c :2:w/c :3:y/c &&
+			git rev-parse >expect \
+				 O:z/a  O:z/b  O:x/d  O:x/c  O:x/c  O:x/c &&
+			test_cmp expect actual &&
+
+			git hash-object y/c~B^0 >actual &&
+			git rev-parse O:x/c >expect &&
+			test_cmp expect actual
+		fi &&
 
 		echo important >expect &&
 		test_cmp expect y/c
@@ -3216,25 +3425,38 @@ test_expect_success '10c2: Overwrite untracked with dir rename/rename(1to2), oth
 		echo important >y/c &&
 
 		test_must_fail git -c merge.directoryRenames=true merge -s recursive A^0 >out 2>err &&
-		test_i18ngrep "CONFLICT (rename/rename)" out &&
-		test_i18ngrep "Refusing to lose untracked file at y/c; adding as y/c~HEAD instead" out &&
-
-		git ls-files -s >out &&
-		test_line_count = 6 out &&
-		git ls-files -u >out &&
-		test_line_count = 3 out &&
-		git ls-files -o >out &&
-		test_line_count = 3 out &&
-
-		git rev-parse >actual \
-			:0:y/a :0:y/b :0:x/d :1:x/c :3:w/c :2:y/c &&
-		git rev-parse >expect \
-			 O:z/a  O:z/b  O:x/d  O:x/c  O:x/c  O:x/c &&
-		test_cmp expect actual &&
-
-		git hash-object y/c~HEAD >actual &&
-		git rev-parse O:x/c >expect &&
-		test_cmp expect actual &&
+		if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+		then
+			test_path_is_missing .git/MERGE_HEAD &&
+			test_grep "error: The following untracked working tree files would be overwritten by merge" err &&
+
+			git ls-files -s >out &&
+			test_line_count = 4 out &&
+			git ls-files -u >out &&
+			test_line_count = 0 out &&
+			git ls-files -o >out &&
+			test_line_count = 3 out
+		else
+			test_grep "CONFLICT (rename/rename)" out &&
+			test_grep "Refusing to lose untracked file at y/c; adding as y/c~HEAD instead" out &&
+
+			git ls-files -s >out &&
+			test_line_count = 6 out &&
+			git ls-files -u >out &&
+			test_line_count = 3 out &&
+			git ls-files -o >out &&
+			test_line_count = 3 out &&
+
+			git rev-parse >actual \
+				:0:y/a :0:y/b :0:x/d :1:x/c :3:w/c :2:y/c &&
+			git rev-parse >expect \
+				 O:z/a  O:z/b  O:x/d  O:x/c  O:x/c  O:x/c &&
+			test_cmp expect actual &&
+
+			git hash-object y/c~HEAD >actual &&
+			git rev-parse O:x/c >expect &&
+			test_cmp expect actual
+		fi &&
 
 		echo important >expect &&
 		test_cmp expect y/c
@@ -3250,7 +3472,7 @@ test_expect_success '10c2: Overwrite untracked with dir rename/rename(1to2), oth
 #             ERROR_MSG(Refusing to lose untracked file at y/wham)
 
 test_setup_10d () {
-	test_create_repo 10d &&
+	git init 10d &&
 	(
 		cd 10d &&
 
@@ -3292,37 +3514,50 @@ test_expect_success '10d: Delete untracked with dir rename/rename(2to1)' '
 		echo important >y/wham &&
 
 		test_must_fail git -c merge.directoryRenames=true merge -s recursive B^0 >out 2>err &&
-		test_i18ngrep "CONFLICT (rename/rename)" out &&
-		test_i18ngrep "Refusing to lose untracked file at y/wham" out &&
-
-		git ls-files -s >out &&
-		test_line_count = 6 out &&
-		git ls-files -u >out &&
-		test_line_count = 2 out &&
-		git ls-files -o >out &&
-		test_line_count = 3 out &&
-
-		git rev-parse >actual \
-			:0:y/a :0:y/b :0:y/d :0:y/e :2:y/wham :3:y/wham &&
-		git rev-parse >expect \
-			 O:z/a  O:z/b  O:x/d  O:x/e  O:z/c     O:x/f &&
-		test_cmp expect actual &&
-
-		test_must_fail git rev-parse :1:y/wham &&
+		if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+		then
+			test_path_is_missing .git/MERGE_HEAD &&
+			test_grep "error: The following untracked working tree files would be overwritten by merge" err &&
+
+			git ls-files -s >out &&
+			test_line_count = 6 out &&
+			git ls-files -u >out &&
+			test_line_count = 0 out &&
+			git ls-files -o >out &&
+			test_line_count = 3 out
+		else
+			test_grep "CONFLICT (rename/rename)" out &&
+			test_grep "Refusing to lose untracked file at y/wham" out &&
+
+			git ls-files -s >out &&
+			test_line_count = 6 out &&
+			git ls-files -u >out &&
+			test_line_count = 2 out &&
+			git ls-files -o >out &&
+			test_line_count = 3 out &&
+
+			git rev-parse >actual \
+				:0:y/a :0:y/b :0:y/d :0:y/e :2:y/wham :3:y/wham &&
+			git rev-parse >expect \
+				 O:z/a  O:z/b  O:x/d  O:x/e  O:z/c     O:x/f &&
+			test_cmp expect actual &&
+
+			test_must_fail git rev-parse :1:y/wham &&
+
+			# Test that two-way merge in y/wham~merged is as expected
+			git cat-file -p :2:y/wham >expect &&
+			git cat-file -p :3:y/wham >other &&
+			>empty &&
+			test_must_fail git merge-file \
+				-L "HEAD" \
+				-L "" \
+				-L "B^0" \
+				expect empty other &&
+			test_cmp expect y/wham~merged
+		fi &&
 
 		echo important >expect &&
-		test_cmp expect y/wham &&
-
-		# Test that the two-way merge in y/wham~merged is as expected
-		git cat-file -p :2:y/wham >expect &&
-		git cat-file -p :3:y/wham >other &&
-		>empty &&
-		test_must_fail git merge-file \
-			-L "HEAD" \
-			-L "" \
-			-L "B^0" \
-			expect empty other &&
-		test_cmp expect y/wham~merged
+		test_cmp expect y/wham
 	)
 '
 
@@ -3333,7 +3568,7 @@ test_expect_success '10d: Delete untracked with dir rename/rename(2to1)' '
 #   Expected: y/{a,b,c} + untracked z/c
 
 test_setup_10e () {
-	test_create_repo 10e &&
+	git init 10e &&
 	(
 		cd 10e &&
 
@@ -3361,7 +3596,8 @@ test_setup_10e () {
 	)
 }
 
-test_expect_failure '10e: Does git complain about untracked file that is not really in the way?' '
+test_expect_merge_algorithm failure success '10e: Does git complain about untracked file that is not really in the way?' '
+	test_setup_10e &&
 	(
 		cd 10e &&
 
@@ -3370,7 +3606,7 @@ test_expect_failure '10e: Does git complain about untracked file that is not rea
 		echo random >z/c &&
 
 		git -c merge.directoryRenames=true merge -s recursive B^0 >out 2>err &&
-		test_i18ngrep ! "following untracked working tree files would be overwritten by merge" err &&
+		test_grep ! "following untracked working tree files would be overwritten by merge" err &&
 
 		git ls-files -s >out &&
 		test_line_count = 3 out &&
@@ -3414,7 +3650,7 @@ test_expect_failure '10e: Does git complain about untracked file that is not rea
 #             z/c with uncommitted mods on top of A:z/c_v1
 
 test_setup_11a () {
-	test_create_repo 11a &&
+	git init 11a &&
 	(
 		cd 11a &&
 
@@ -3451,28 +3687,35 @@ test_expect_success '11a: Avoid losing dirty contents with simple rename' '
 		echo stuff >>z/c &&
 
 		test_must_fail git -c merge.directoryRenames=true merge -s recursive B^0 >out 2>err &&
-		test_i18ngrep "Refusing to lose dirty file at z/c" out &&
+		if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+		then
+			test_path_is_missing .git/MERGE_HEAD &&
+			test_grep "error: Your local changes to the following files would be overwritten by merge" err
+		else
+			test_grep "Refusing to lose dirty file at z/c" out &&
+
+			git ls-files -s >out &&
+			test_line_count = 2 out &&
+			git ls-files -u >out &&
+			test_line_count = 1 out &&
+			git ls-files -o >out &&
+			test_line_count = 3 out &&
+
+			git rev-parse >actual \
+				:0:z/a :2:z/c &&
+			git rev-parse >expect \
+				 O:z/a  B:z/b &&
+			test_cmp expect actual &&
+
+			git hash-object z/c~HEAD >actual &&
+			git rev-parse B:z/b >expect &&
+			test_cmp expect actual
+		fi &&
 
 		test_seq 1 10 >expected &&
 		echo stuff >>expected &&
-		test_cmp expected z/c &&
+		test_cmp expected z/c
 
-		git ls-files -s >out &&
-		test_line_count = 2 out &&
-		git ls-files -u >out &&
-		test_line_count = 1 out &&
-		git ls-files -o >out &&
-		test_line_count = 4 out &&
-
-		git rev-parse >actual \
-			:0:z/a :2:z/c &&
-		git rev-parse >expect \
-			 O:z/a  B:z/b &&
-		test_cmp expect actual &&
-
-		git hash-object z/c~HEAD >actual &&
-		git rev-parse B:z/b >expect &&
-		test_cmp expect actual
 	)
 '
 
@@ -3485,7 +3728,7 @@ test_expect_success '11a: Avoid losing dirty contents with simple rename' '
 
 
 test_setup_11b () {
-	test_create_repo 11b &&
+	git init 11b &&
 	(
 		cd 11b &&
 
@@ -3523,32 +3766,39 @@ test_expect_success '11b: Avoid losing dirty file involved in directory rename'
 		git checkout A^0 &&
 		echo stuff >>z/c &&
 
-		git -c merge.directoryRenames=true merge -s recursive B^0 >out 2>err &&
-		test_i18ngrep "Refusing to lose dirty file at z/c" out &&
+		if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+		then
+			test_must_fail git -c merge.directoryRenames=true merge -s recursive B^0 >out 2>err &&
+			test_path_is_missing .git/MERGE_HEAD &&
+			test_grep "error: Your local changes to the following files would be overwritten by merge" err
+		else
+			git -c merge.directoryRenames=true merge -s recursive B^0 >out 2>err &&
+			test_grep "Refusing to lose dirty file at z/c" out &&
+
+			git ls-files -s >out &&
+			test_line_count = 3 out &&
+			git ls-files -u >out &&
+			test_line_count = 0 out &&
+			git ls-files -m >out &&
+			test_line_count = 0 out &&
+			git ls-files -o >out &&
+			test_line_count = 3 out &&
+
+			git rev-parse >actual \
+				:0:x/b :0:y/a :0:y/c &&
+			git rev-parse >expect \
+				 O:x/b  O:z/a  B:x/c &&
+			test_cmp expect actual &&
+
+			git hash-object y/c >actual &&
+			git rev-parse B:x/c >expect &&
+			test_cmp expect actual
+		fi &&
 
 		grep -q stuff z/c &&
 		test_seq 1 10 >expected &&
 		echo stuff >>expected &&
-		test_cmp expected z/c &&
-
-		git ls-files -s >out &&
-		test_line_count = 3 out &&
-		git ls-files -u >out &&
-		test_line_count = 0 out &&
-		git ls-files -m >out &&
-		test_line_count = 0 out &&
-		git ls-files -o >out &&
-		test_line_count = 4 out &&
-
-		git rev-parse >actual \
-			:0:x/b :0:y/a :0:y/c &&
-		git rev-parse >expect \
-			 O:x/b  O:z/a  B:x/c &&
-		test_cmp expect actual &&
-
-		git hash-object y/c >actual &&
-		git rev-parse B:x/c >expect &&
-		test_cmp expect actual
+		test_cmp expected z/c
 	)
 '
 
@@ -3560,7 +3810,7 @@ test_expect_success '11b: Avoid losing dirty file involved in directory rename'
 #             y/c left untouched (still has uncommitted mods)
 
 test_setup_11c () {
-	test_create_repo 11c &&
+	git init 11c &&
 	(
 		cd 11c &&
 
@@ -3600,7 +3850,13 @@ test_expect_success '11c: Avoid losing not-uptodate with rename + D/F conflict'
 		echo stuff >>y/c &&
 
 		test_must_fail git -c merge.directoryRenames=true merge -s recursive B^0 >out 2>err &&
-		test_i18ngrep "following files would be overwritten by merge" err &&
+		if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+		then
+			test_path_is_missing .git/MERGE_HEAD &&
+			test_grep "error: Your local changes to the following files would be overwritten by merge" err
+		else
+			test_grep "following files would be overwritten by merge" err
+		fi &&
 
 		grep -q stuff y/c &&
 		test_seq 1 10 >expected &&
@@ -3627,7 +3883,7 @@ test_expect_success '11c: Avoid losing not-uptodate with rename + D/F conflict'
 #             y/{a,c~HEAD,c/d}, x/b, now-untracked z/c_v1 with uncommitted mods
 
 test_setup_11d () {
-	test_create_repo 11d &&
+	git init 11d &&
 	(
 		cd 11d &&
 
@@ -3668,29 +3924,35 @@ test_expect_success '11d: Avoid losing not-uptodate with rename + D/F conflict'
 		echo stuff >>z/c &&
 
 		test_must_fail git -c merge.directoryRenames=true merge -s recursive B^0 >out 2>err &&
-		test_i18ngrep "Refusing to lose dirty file at z/c" out &&
+		if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+		then
+			test_path_is_missing .git/MERGE_HEAD &&
+			test_grep "error: Your local changes to the following files would be overwritten by merge" err
+		else
+			test_grep "Refusing to lose dirty file at z/c" out &&
+
+			git ls-files -s >out &&
+			test_line_count = 4 out &&
+			git ls-files -u >out &&
+			test_line_count = 1 out &&
+			git ls-files -o >out &&
+			test_line_count = 4 out &&
+
+			git rev-parse >actual \
+				:0:x/b :0:y/a :0:y/c/d :3:y/c &&
+			git rev-parse >expect \
+				 O:x/b  O:z/a  B:y/c/d  B:x/c &&
+			test_cmp expect actual &&
+
+			git hash-object y/c~HEAD >actual &&
+			git rev-parse B:x/c >expect &&
+			test_cmp expect actual
+		fi &&
 
 		grep -q stuff z/c &&
 		test_seq 1 10 >expected &&
 		echo stuff >>expected &&
-		test_cmp expected z/c &&
-
-		git ls-files -s >out &&
-		test_line_count = 4 out &&
-		git ls-files -u >out &&
-		test_line_count = 1 out &&
-		git ls-files -o >out &&
-		test_line_count = 5 out &&
-
-		git rev-parse >actual \
-			:0:x/b :0:y/a :0:y/c/d :3:y/c &&
-		git rev-parse >expect \
-			 O:x/b  O:z/a  B:y/c/d  B:x/c &&
-		test_cmp expect actual &&
-
-		git hash-object y/c~HEAD >actual &&
-		git rev-parse B:x/c >expect &&
-		test_cmp expect actual
+		test_cmp expected z/c
 	)
 '
 
@@ -3706,7 +3968,7 @@ test_expect_success '11d: Avoid losing not-uptodate with rename + D/F conflict'
 #             y/c has dirty file from before merge
 
 test_setup_11e () {
-	test_create_repo 11e &&
+	git init 11e &&
 	(
 		cd 11e &&
 
@@ -3748,37 +4010,43 @@ test_expect_success '11e: Avoid deleting not-uptodate with dir rename/rename(1to
 		echo mods >>y/c &&
 
 		test_must_fail git -c merge.directoryRenames=true merge -s recursive B^0 >out 2>err &&
-		test_i18ngrep "CONFLICT (rename/rename)" out &&
-		test_i18ngrep "Refusing to lose dirty file at y/c" out &&
-
-		git ls-files -s >out &&
-		test_line_count = 7 out &&
-		git ls-files -u >out &&
-		test_line_count = 4 out &&
-		git ls-files -o >out &&
-		test_line_count = 3 out &&
+		if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+		then
+			test_path_is_missing .git/MERGE_HEAD &&
+			test_grep "error: Your local changes to the following files would be overwritten by merge" err
+		else
+			test_grep "CONFLICT (rename/rename)" out &&
+			test_grep "Refusing to lose dirty file at y/c" out &&
+
+			git ls-files -s >out &&
+			test_line_count = 7 out &&
+			git ls-files -u >out &&
+			test_line_count = 4 out &&
+			git ls-files -o >out &&
+			test_line_count = 3 out &&
+
+			git rev-parse >actual \
+				:0:y/a :0:y/b :0:x/d :1:x/c :2:w/c :2:y/c :3:y/c &&
+			git rev-parse >expect \
+				 O:z/a  O:z/b  O:x/d  O:x/c  O:x/c  A:y/c  O:x/c &&
+			test_cmp expect actual &&
+
+			# See if y/c~merged has expected contents; requires manually
+			# doing the expected file merge
+			git cat-file -p A:y/c >c1 &&
+			git cat-file -p B:z/c >c2 &&
+			>empty &&
+			test_must_fail git merge-file \
+				-L "HEAD" \
+				-L "" \
+				-L "B^0" \
+				c1 empty c2 &&
+			test_cmp c1 y/c~merged
+		fi &&
 
 		echo different >expected &&
 		echo mods >>expected &&
-		test_cmp expected y/c &&
-
-		git rev-parse >actual \
-			:0:y/a :0:y/b :0:x/d :1:x/c :2:w/c :2:y/c :3:y/c &&
-		git rev-parse >expect \
-			 O:z/a  O:z/b  O:x/d  O:x/c  O:x/c  A:y/c  O:x/c &&
-		test_cmp expect actual &&
-
-		# See if y/c~merged has expected contents; requires manually
-		# doing the expected file merge
-		git cat-file -p A:y/c >c1 &&
-		git cat-file -p B:z/c >c2 &&
-		>empty &&
-		test_must_fail git merge-file \
-			-L "HEAD" \
-			-L "" \
-			-L "B^0" \
-			c1 empty c2 &&
-		test_cmp c1 y/c~merged
+		test_cmp expected y/c
 	)
 '
 
@@ -3792,7 +4060,7 @@ test_expect_success '11e: Avoid deleting not-uptodate with dir rename/rename(1to
 #             ERROR_MSG(Refusing to lose dirty file at y/wham)
 
 test_setup_11f () {
-	test_create_repo 11f &&
+	git init 11f &&
 	(
 		cd 11f &&
 
@@ -3831,38 +4099,44 @@ test_expect_success '11f: Avoid deleting not-uptodate with dir rename/rename(2to
 		echo important >>y/wham &&
 
 		test_must_fail git -c merge.directoryRenames=true merge -s recursive B^0 >out 2>err &&
-		test_i18ngrep "CONFLICT (rename/rename)" out &&
-		test_i18ngrep "Refusing to lose dirty file at y/wham" out &&
-
-		git ls-files -s >out &&
-		test_line_count = 4 out &&
-		git ls-files -u >out &&
-		test_line_count = 2 out &&
-		git ls-files -o >out &&
-		test_line_count = 3 out &&
+		if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+		then
+			test_path_is_missing .git/MERGE_HEAD &&
+			test_grep "error: Your local changes to the following files would be overwritten by merge" err
+		else
+			test_grep "CONFLICT (rename/rename)" out &&
+			test_grep "Refusing to lose dirty file at y/wham" out &&
+
+			git ls-files -s >out &&
+			test_line_count = 4 out &&
+			git ls-files -u >out &&
+			test_line_count = 2 out &&
+			git ls-files -o >out &&
+			test_line_count = 3 out &&
+
+			test_must_fail git rev-parse :1:y/wham &&
+
+			git rev-parse >actual \
+				:0:y/a :0:y/b :2:y/wham :3:y/wham &&
+			git rev-parse >expect \
+				 O:z/a  O:z/b  O:x/c     O:x/d &&
+			test_cmp expect actual &&
+
+			# Test that two-way merge in y/wham~merged is as expected
+			git cat-file -p :2:y/wham >expect &&
+			git cat-file -p :3:y/wham >other &&
+			>empty &&
+			test_must_fail git merge-file \
+				-L "HEAD" \
+				-L "" \
+				-L "B^0" \
+				expect empty other &&
+			test_cmp expect y/wham~merged
+		fi &&
 
 		test_seq 1 10 >expected &&
 		echo important >>expected &&
-		test_cmp expected y/wham &&
-
-		test_must_fail git rev-parse :1:y/wham &&
-
-		git rev-parse >actual \
-			:0:y/a :0:y/b :2:y/wham :3:y/wham &&
-		git rev-parse >expect \
-			 O:z/a  O:z/b  O:x/c     O:x/d &&
-		test_cmp expect actual &&
-
-		# Test that the two-way merge in y/wham~merged is as expected
-		git cat-file -p :2:y/wham >expect &&
-		git cat-file -p :3:y/wham >other &&
-		>empty &&
-		test_must_fail git merge-file \
-			-L "HEAD" \
-			-L "" \
-			-L "B^0" \
-			expect empty other &&
-		test_cmp expect y/wham~merged
+		test_cmp expected y/wham
 	)
 '
 
@@ -3881,7 +4155,7 @@ test_expect_success '11f: Avoid deleting not-uptodate with dir rename/rename(2to
 #   Expected: node1/{leaf1,leaf2,leaf5,node2/{leaf3,leaf4,leaf6}}
 
 test_setup_12a () {
-	test_create_repo 12a &&
+	git init 12a &&
 	(
 		cd 12a &&
 
@@ -3938,31 +4212,124 @@ test_expect_success '12a: Moving one directory hierarchy into another' '
 	)
 '
 
-# Testcase 12b, Moving two directory hierarchies into each other
+# Testcase 12b1, Moving two directory hierarchies into each other
 #   (Related to testcases 1c and 12c)
 #   Commit O: node1/{leaf1, leaf2}, node2/{leaf3, leaf4}
 #   Commit A: node1/{leaf1, leaf2, node2/{leaf3, leaf4}}
 #   Commit B: node2/{leaf3, leaf4, node1/{leaf1, leaf2}}
-#   Expected: node1/node2/node1/{leaf1, leaf2},
+#   Expected: node1/node2/{leaf3, leaf4}
+#             node2/node1/{leaf1, leaf2}
+#   NOTE: If there were new files added to the old node1/ or node2/ directories,
+#         then we would need to detect renames for those directories and would
+#         find that:
+#             commit A renames node2/ -> node1/node2/
+#             commit B renames node1/ -> node2/node1/
+#         Applying those directory renames to the initial result (making all
+#         four paths experience a transitive renaming), yields
+#             node1/node2/node1/{leaf1, leaf2}
 #             node2/node1/node2/{leaf3, leaf4}
+#         as the result.  It may be really weird to have two directories
+#         rename each other, but simple rules give weird results when given
+#         weird inputs.  HOWEVER, the "If" at the beginning of those NOTE was
+#         false; there were no new files added and thus there is no directory
+#         rename detection to perform.  As such, we just have simple renames
+#         and the expected answer is:
+#             node1/node2/{leaf3, leaf4}
+#             node2/node1/{leaf1, leaf2}
+
+test_setup_12b1 () {
+	git init 12b1 &&
+	(
+		cd 12b1 &&
+
+		mkdir -p node1 node2 &&
+		echo leaf1 >node1/leaf1 &&
+		echo leaf2 >node1/leaf2 &&
+		echo leaf3 >node2/leaf3 &&
+		echo leaf4 >node2/leaf4 &&
+		git add node1 node2 &&
+		test_tick &&
+		git commit -m "O" &&
+
+		git branch O &&
+		git branch A &&
+		git branch B &&
+
+		git checkout A &&
+		git mv node2/ node1/ &&
+		test_tick &&
+		git commit -m "A" &&
+
+		git checkout B &&
+		git mv node1/ node2/ &&
+		test_tick &&
+		git commit -m "B"
+	)
+}
+
+test_expect_merge_algorithm failure success '12b1: Moving two directory hierarchies into each other' '
+	test_setup_12b1 &&
+	(
+		cd 12b1 &&
+
+		git checkout A^0 &&
+
+		git -c merge.directoryRenames=true merge -s recursive B^0 &&
+
+		git ls-files -s >out &&
+		test_line_count = 4 out &&
+
+		git rev-parse >actual \
+			HEAD:node2/node1/leaf1 \
+			HEAD:node2/node1/leaf2 \
+			HEAD:node1/node2/leaf3 \
+			HEAD:node1/node2/leaf4 &&
+		git rev-parse >expect \
+			O:node1/leaf1 \
+			O:node1/leaf2 \
+			O:node2/leaf3 \
+			O:node2/leaf4 &&
+		test_cmp expect actual
+	)
+'
+
+# Testcase 12b2, Moving two directory hierarchies into each other
+#   (Related to testcases 1c and 12c)
+#   Commit O: node1/{leaf1, leaf2}, node2/{leaf3, leaf4}
+#   Commit A: node1/{leaf1, leaf2, leaf5, node2/{leaf3, leaf4}}
+#   Commit B: node2/{leaf3, leaf4, leaf6, node1/{leaf1, leaf2}}
+#   Expected: node1/node2/{node1/{leaf1, leaf2}, leaf6}
+#             node2/node1/{node2/{leaf3, leaf4}, leaf5}
 #   NOTE: Without directory renames, we would expect
-#                   node2/node1/{leaf1, leaf2},
-#                   node1/node2/{leaf3, leaf4}
+#             A: node2/leaf3 -> node1/node2/leaf3
+#             A: node2/leaf1 -> node1/node2/leaf4
+#             A: Adds           node1/leaf5
+#             B: node1/leaf1 -> node2/node1/leaf1
+#             B: node1/leaf2 -> node2/node1/leaf2
+#             B: Adds           node2/leaf6
 #         with directory rename detection, we note that
 #             commit A renames node2/ -> node1/node2/
 #             commit B renames node1/ -> node2/node1/
-#         therefore, applying those directory renames to the initial result
-#         (making all four paths experience a transitive renaming), yields
-#         the expected result.
+#         therefore, applying A's directory rename to the paths added in B gives:
+#             B: node1/leaf1 -> node1/node2/node1/leaf1
+#             B: node1/leaf2 -> node1/node2/node1/leaf2
+#             B: Adds           node1/node2/leaf6
+#         and applying B's directory rename to the paths added in A gives:
+#             A: node2/leaf3 -> node2/node1/node2/leaf3
+#             A: node2/leaf1 -> node2/node1/node2/leaf4
+#             A: Adds           node2/node1/leaf5
+#         resulting in the expected
+#             node1/node2/{node1/{leaf1, leaf2}, leaf6}
+#             node2/node1/{node2/{leaf3, leaf4}, leaf5}
 #
 #         You may ask, is it weird to have two directories rename each other?
 #         To which, I can do no more than shrug my shoulders and say that
 #         even simple rules give weird results when given weird inputs.
 
-test_setup_12b () {
-	test_create_repo 12b &&
+test_setup_12b2 () {
+	git init 12b2 &&
 	(
-		cd 12b &&
+		cd 12b2 &&
 
 		mkdir -p node1 node2 &&
 		echo leaf1 >node1/leaf1 &&
@@ -3979,43 +4346,51 @@ test_setup_12b () {
 
 		git checkout A &&
 		git mv node2/ node1/ &&
+		echo leaf5 >node1/leaf5 &&
+		git add node1/leaf5 &&
 		test_tick &&
 		git commit -m "A" &&
 
 		git checkout B &&
 		git mv node1/ node2/ &&
+		echo leaf6 >node2/leaf6 &&
+		git add node2/leaf6 &&
 		test_tick &&
 		git commit -m "B"
 	)
 }
 
-test_expect_success '12b: Moving two directory hierarchies into each other' '
-	test_setup_12b &&
+test_expect_success '12b2: Moving two directory hierarchies into each other' '
+	test_setup_12b2 &&
 	(
-		cd 12b &&
+		cd 12b2 &&
 
 		git checkout A^0 &&
 
 		git -c merge.directoryRenames=true merge -s recursive B^0 &&
 
 		git ls-files -s >out &&
-		test_line_count = 4 out &&
+		test_line_count = 6 out &&
 
 		git rev-parse >actual \
 			HEAD:node1/node2/node1/leaf1 \
 			HEAD:node1/node2/node1/leaf2 \
 			HEAD:node2/node1/node2/leaf3 \
-			HEAD:node2/node1/node2/leaf4 &&
+			HEAD:node2/node1/node2/leaf4 \
+			HEAD:node2/node1/leaf5       \
+			HEAD:node1/node2/leaf6       &&
 		git rev-parse >expect \
 			O:node1/leaf1 \
 			O:node1/leaf2 \
 			O:node2/leaf3 \
-			O:node2/leaf4 &&
+			O:node2/leaf4 \
+			A:node1/leaf5 \
+			B:node2/leaf6 &&
 		test_cmp expect actual
 	)
 '
 
-# Testcase 12c, Moving two directory hierarchies into each other w/ content merge
+# Testcase 12c1, Moving two directory hierarchies into each other w/ content merge
 #   (Related to testcase 12b)
 #   Commit O: node1/{       leaf1_1, leaf2_1}, node2/{leaf3_1, leaf4_1}
 #   Commit A: node1/{       leaf1_2, leaf2_2,  node2/{leaf3_2, leaf4_2}}
@@ -4023,13 +4398,13 @@ test_expect_success '12b: Moving two directory hierarchies into each other' '
 #   Expected: Content merge conflicts for each of:
 #               node1/node2/node1/{leaf1, leaf2},
 #               node2/node1/node2/{leaf3, leaf4}
-#   NOTE: This is *exactly* like 12c, except that every path is modified on
+#   NOTE: This is *exactly* like 12b1, except that every path is modified on
 #         each side of the merge.
 
-test_setup_12c () {
-	test_create_repo 12c &&
+test_setup_12c1 () {
+	git init 12c1 &&
 	(
-		cd 12c &&
+		cd 12c1 &&
 
 		mkdir -p node1 node2 &&
 		printf "1\n2\n3\n4\n5\n6\n7\n8\nleaf1\n" >node1/leaf1 &&
@@ -4046,24 +4421,24 @@ test_setup_12c () {
 
 		git checkout A &&
 		git mv node2/ node1/ &&
-		for i in `git ls-files`; do echo side A >>$i; done &&
+		for i in $(git ls-files); do echo side A >>$i; done &&
 		git add -u &&
 		test_tick &&
 		git commit -m "A" &&
 
 		git checkout B &&
 		git mv node1/ node2/ &&
-		for i in `git ls-files`; do echo side B >>$i; done &&
+		for i in $(git ls-files); do echo side B >>$i; done &&
 		git add -u &&
 		test_tick &&
 		git commit -m "B"
 	)
 }
 
-test_expect_success '12c: Moving one directory hierarchy into another w/ content merge' '
-	test_setup_12c &&
+test_expect_merge_algorithm failure success '12c1: Moving one directory hierarchy into another w/ content merge' '
+	test_setup_12c1 &&
 	(
-		cd 12c &&
+		cd 12c1 &&
 
 		git checkout A^0 &&
 
@@ -4073,6 +4448,102 @@ test_expect_success '12c: Moving one directory hierarchy into another w/ content
 		test_line_count = 12 out &&
 
 		git rev-parse >actual \
+			:1:node2/node1/leaf1 \
+			:1:node2/node1/leaf2 \
+			:1:node1/node2/leaf3 \
+			:1:node1/node2/leaf4 \
+			:2:node2/node1/leaf1 \
+			:2:node2/node1/leaf2 \
+			:2:node1/node2/leaf3 \
+			:2:node1/node2/leaf4 \
+			:3:node2/node1/leaf1 \
+			:3:node2/node1/leaf2 \
+			:3:node1/node2/leaf3 \
+			:3:node1/node2/leaf4 &&
+		git rev-parse >expect \
+			O:node1/leaf1 \
+			O:node1/leaf2 \
+			O:node2/leaf3 \
+			O:node2/leaf4 \
+			A:node1/leaf1 \
+			A:node1/leaf2 \
+			A:node1/node2/leaf3 \
+			A:node1/node2/leaf4 \
+			B:node2/node1/leaf1 \
+			B:node2/node1/leaf2 \
+			B:node2/leaf3 \
+			B:node2/leaf4 &&
+		test_cmp expect actual
+	)
+'
+
+# Testcase 12c2, Moving two directory hierarchies into each other w/ content merge
+#   (Related to testcase 12b)
+#   Commit O: node1/{       leaf1_1, leaf2_1}, node2/{leaf3_1, leaf4_1}
+#   Commit A: node1/{       leaf1_2, leaf2_2,  node2/{leaf3_2, leaf4_2}, leaf5}
+#   Commit B: node2/{node1/{leaf1_3, leaf2_3},        leaf3_3, leaf4_3,  leaf6}
+#   Expected: Content merge conflicts for each of:
+#               node1/node2/node1/{leaf1, leaf2}
+#               node2/node1/node2/{leaf3, leaf4}
+#             plus
+#               node2/node1/leaf5
+#               node1/node2/leaf6
+#   NOTE: This is *exactly* like 12b2, except that every path from O is modified
+#         on each side of the merge.
+
+test_setup_12c2 () {
+	git init 12c2 &&
+	(
+		cd 12c2 &&
+
+		mkdir -p node1 node2 &&
+		printf "1\n2\n3\n4\n5\n6\n7\n8\nleaf1\n" >node1/leaf1 &&
+		printf "1\n2\n3\n4\n5\n6\n7\n8\nleaf2\n" >node1/leaf2 &&
+		printf "1\n2\n3\n4\n5\n6\n7\n8\nleaf3\n" >node2/leaf3 &&
+		printf "1\n2\n3\n4\n5\n6\n7\n8\nleaf4\n" >node2/leaf4 &&
+		git add node1 node2 &&
+		test_tick &&
+		git commit -m "O" &&
+
+		git branch O &&
+		git branch A &&
+		git branch B &&
+
+		git checkout A &&
+		git mv node2/ node1/ &&
+		for i in $(git ls-files); do echo side A >>$i; done &&
+		git add -u &&
+		echo leaf5 >node1/leaf5 &&
+		git add node1/leaf5 &&
+		test_tick &&
+		git commit -m "A" &&
+
+		git checkout B &&
+		git mv node1/ node2/ &&
+		for i in $(git ls-files); do echo side B >>$i; done &&
+		git add -u &&
+		echo leaf6 >node2/leaf6 &&
+		git add node2/leaf6 &&
+		test_tick &&
+		git commit -m "B"
+	)
+}
+
+test_expect_success '12c2: Moving one directory hierarchy into another w/ content merge' '
+	test_setup_12c2 &&
+	(
+		cd 12c2 &&
+
+		git checkout A^0 &&
+
+		test_must_fail git -c merge.directoryRenames=true merge -s recursive B^0 &&
+
+		git ls-files -s >out &&
+		test_line_count = 14 out &&
+		git ls-files -u >out &&
+		test_line_count = 12 out &&
+
+		git rev-parse >actual \
 			:1:node1/node2/node1/leaf1 \
 			:1:node1/node2/node1/leaf2 \
 			:1:node2/node1/node2/leaf3 \
@@ -4084,7 +4555,9 @@ test_expect_success '12c: Moving one directory hierarchy into another w/ content
 			:3:node1/node2/node1/leaf1 \
 			:3:node1/node2/node1/leaf2 \
 			:3:node2/node1/node2/leaf3 \
-			:3:node2/node1/node2/leaf4 &&
+			:3:node2/node1/node2/leaf4 \
+			:0:node2/node1/leaf5       \
+			:0:node1/node2/leaf6       &&
 		git rev-parse >expect \
 			O:node1/leaf1 \
 			O:node1/leaf2 \
@@ -4097,7 +4570,9 @@ test_expect_success '12c: Moving one directory hierarchy into another w/ content
 			B:node2/node1/leaf1 \
 			B:node2/node1/leaf2 \
 			B:node2/leaf3 \
-			B:node2/leaf4 &&
+			B:node2/leaf4 \
+			A:node1/leaf5 \
+			B:node2/leaf6 &&
 		test_cmp expect actual
 	)
 '
@@ -4109,7 +4584,7 @@ test_expect_success '12c: Moving one directory hierarchy into another w/ content
 #   Expected: subdir/foo, bar
 
 test_setup_12d () {
-	test_create_repo 12d &&
+	git init 12d &&
 	(
 		cd 12d &&
 
@@ -4167,7 +4642,7 @@ test_expect_success '12d: Rename/merge subdir into the root, variant 1' '
 #   Expected: foo, bar
 
 test_setup_12e () {
-	test_create_repo 12e &&
+	git init 12e &&
 	(
 		cd 12e &&
 
@@ -4218,6 +4693,673 @@ test_expect_success '12e: Rename/merge subdir into the root, variant 2' '
 	)
 '
 
+# Testcase 12f, Rebase of patches with big directory rename
+#   Commit O:
+#              dir/subdir/{a,b,c,d,e_O,Makefile_TOP_O}
+#              dir/subdir/tweaked/{f,g,h,Makefile_SUB_O}
+#              dir/unchanged/<LOTS OF FILES>
+#   Commit A:
+#     (Remove f & g, move e into newsubdir, rename dir/->folder/, modify files)
+#              folder/subdir/{a,b,c,d,Makefile_TOP_A}
+#              folder/subdir/newsubdir/e_A
+#              folder/subdir/tweaked/{h,Makefile_SUB_A}
+#              folder/unchanged/<LOTS OF FILES>
+#   Commit B1:
+#     (add newfile.{c,py}, modify underscored files)
+#              dir/{a,b,c,d,e_B1,Makefile_TOP_B1,newfile.c}
+#              dir/tweaked/{f,g,h,Makefile_SUB_B1,newfile.py}
+#              dir/unchanged/<LOTS OF FILES>
+#   Commit B2:
+#     (Modify e further, add newfile.rs)
+#              dir/{a,b,c,d,e_B2,Makefile_TOP_B1,newfile.c,newfile.rs}
+#              dir/tweaked/{f,g,h,Makefile_SUB_B1,newfile.py}
+#              dir/unchanged/<LOTS OF FILES>
+#   Expected:
+#          B1-picked:
+#              folder/subdir/{a,b,c,d,Makefile_TOP_Merge1,newfile.c}
+#              folder/subdir/newsubdir/e_Merge1
+#              folder/subdir/tweaked/{h,Makefile_SUB_Merge1,newfile.py}
+#              folder/unchanged/<LOTS OF FILES>
+#          B2-picked:
+#              folder/subdir/{a,b,c,d,Makefile_TOP_Merge1,newfile.c,newfile.rs}
+#              folder/subdir/newsubdir/e_Merge2
+#              folder/subdir/tweaked/{h,Makefile_SUB_Merge1,newfile.py}
+#              folder/unchanged/<LOTS OF FILES>
+# Things being checked here:
+#   1. dir/subdir/newfile.c does not get pushed into folder/subdir/newsubdir/.
+#      dir/subdir/{a,b,c,d} -> folder/subdir/{a,b,c,d} looks like
+#          dir/ -> folder/,
+#      whereas dir/subdir/e -> folder/subdir/newsubdir/e looks like
+#          dir/subdir/ -> folder/subdir/newsubdir/
+#      and if we note that newfile.c is found in dir/subdir/, we might overlook
+#      the dir/ -> folder/ rule that has more weight.  Older git versions did
+#      this.
+#   2. The code to do trivial directory resolves.  Note that
+#      dir/subdir/unchanged/ is unchanged and can be deleted, and files in the
+#      new folder/subdir/unchanged/ are not needed as a target to any renames.
+#      Thus, in the second collect_merge_info_callback() we can just resolve
+#      these two directories trivially without recursing.)
+#   3. Exercising the codepaths for caching renames and deletes from one cherry
+#      pick and re-applying them in the subsequent one.
+
+test_setup_12f () {
+	git init 12f &&
+	(
+		cd 12f &&
+
+		mkdir -p dir/unchanged &&
+		mkdir -p dir/subdir/tweaked &&
+		echo a >dir/subdir/a &&
+		echo b >dir/subdir/b &&
+		echo c >dir/subdir/c &&
+		echo d >dir/subdir/d &&
+		test_seq 1 10 >dir/subdir/e &&
+		test_seq 10 20 >dir/subdir/Makefile &&
+		echo f >dir/subdir/tweaked/f &&
+		echo g >dir/subdir/tweaked/g &&
+		echo h >dir/subdir/tweaked/h &&
+		test_seq 20 30 >dir/subdir/tweaked/Makefile &&
+		for i in $(test_seq 1 88); do
+			echo content $i >dir/unchanged/file_$i
+		done &&
+		git add . &&
+		git commit -m "O" &&
+
+		git branch O &&
+		git branch A &&
+		git branch B &&
+
+		git switch A &&
+		git rm dir/subdir/tweaked/f dir/subdir/tweaked/g &&
+		test_seq 2 10 >dir/subdir/e &&
+		test_seq 11 20 >dir/subdir/Makefile &&
+		test_seq 21 30 >dir/subdir/tweaked/Makefile &&
+		mkdir dir/subdir/newsubdir &&
+		git mv dir/subdir/e dir/subdir/newsubdir/ &&
+		git mv dir folder &&
+		git add . &&
+		git commit -m "A" &&
+
+		git switch B &&
+		mkdir dir/subdir/newsubdir/ &&
+		echo c code >dir/subdir/newfile.c &&
+		echo python code >dir/subdir/newsubdir/newfile.py &&
+		test_seq 1 11 >dir/subdir/e &&
+		test_seq 10 21 >dir/subdir/Makefile &&
+		test_seq 20 31 >dir/subdir/tweaked/Makefile &&
+		git add . &&
+		git commit -m "B1" &&
+
+		echo rust code >dir/subdir/newfile.rs &&
+		test_seq 1 12 >dir/subdir/e &&
+		git add . &&
+		git commit -m "B2"
+	)
+}
+
+test_expect_merge_algorithm failure success '12f: Trivial directory resolve, caching, all kinds of fun' '
+	test_setup_12f &&
+	(
+		cd 12f &&
+
+		git checkout A^0 &&
+		git branch Bmod B &&
+
+		GIT_TRACE2_PERF="$(pwd)/trace.output" git -c merge.directoryRenames=true rebase A Bmod &&
+
+		echo Checking the pick of B1... &&
+
+		test_must_fail git rev-parse Bmod~1:dir &&
+
+		git ls-tree -r Bmod~1 >out &&
+		test_line_count = 98 out &&
+
+		git diff --name-status A Bmod~1 >actual &&
+		q_to_tab >expect <<-\EOF &&
+		MQfolder/subdir/Makefile
+		AQfolder/subdir/newfile.c
+		MQfolder/subdir/newsubdir/e
+		AQfolder/subdir/newsubdir/newfile.py
+		MQfolder/subdir/tweaked/Makefile
+		EOF
+		test_cmp expect actual &&
+
+		# Three-way merged files
+		test_seq  2 11 >e_Merge1 &&
+		test_seq 11 21 >Makefile_TOP &&
+		test_seq 21 31 >Makefile_SUB &&
+		git hash-object >expect      \
+			e_Merge1             \
+			Makefile_TOP         \
+			Makefile_SUB         &&
+		git rev-parse >actual              \
+			Bmod~1:folder/subdir/newsubdir/e     \
+			Bmod~1:folder/subdir/Makefile        \
+			Bmod~1:folder/subdir/tweaked/Makefile &&
+		test_cmp expect actual &&
+
+		# New files showed up at the right location with right contents
+		git rev-parse >expect                \
+			B~1:dir/subdir/newfile.c            \
+			B~1:dir/subdir/newsubdir/newfile.py &&
+		git rev-parse >actual                      \
+			Bmod~1:folder/subdir/newfile.c            \
+			Bmod~1:folder/subdir/newsubdir/newfile.py &&
+		test_cmp expect actual &&
+
+		# Removed files
+		test_path_is_missing folder/subdir/tweaked/f &&
+		test_path_is_missing folder/subdir/tweaked/g &&
+
+		# Unchanged files or directories
+		git rev-parse >actual        \
+			Bmod~1:folder/subdir/a          \
+			Bmod~1:folder/subdir/b          \
+			Bmod~1:folder/subdir/c          \
+			Bmod~1:folder/subdir/d          \
+			Bmod~1:folder/unchanged         \
+			Bmod~1:folder/subdir/tweaked/h &&
+		git rev-parse >expect          \
+			O:dir/subdir/a         \
+			O:dir/subdir/b         \
+			O:dir/subdir/c         \
+			O:dir/subdir/d         \
+			O:dir/unchanged        \
+			O:dir/subdir/tweaked/h &&
+		test_cmp expect actual &&
+
+		echo Checking the pick of B2... &&
+
+		test_must_fail git rev-parse Bmod:dir &&
+
+		git ls-tree -r Bmod >out &&
+		test_line_count = 99 out &&
+
+		git diff --name-status Bmod~1 Bmod >actual &&
+		q_to_tab >expect <<-\EOF &&
+		AQfolder/subdir/newfile.rs
+		MQfolder/subdir/newsubdir/e
+		EOF
+		test_cmp expect actual &&
+
+		# Three-way merged file
+		test_seq  2 12 >e_Merge2 &&
+		git hash-object e_Merge2 >expect &&
+		git rev-parse Bmod:folder/subdir/newsubdir/e >actual &&
+		test_cmp expect actual &&
+
+		grep region_enter.*collect_merge_info trace.output >collect &&
+		test_line_count = 4 collect &&
+		grep region_enter.*process_entries$ trace.output >process &&
+		test_line_count = 2 process
+	)
+'
+
+# Testcase 12g, Testcase with two kinds of "relevant" renames
+#   Commit O: somefile_O, subdir/{a_O,b_O}
+#   Commit A: somefile_A, subdir/{a_O,b_O,c_A}
+#   Commit B: newfile_B,  newdir/{a_B,b_B}
+#   Expected: newfile_{merged}, newdir/{a_B,b_B,c_A}
+
+test_setup_12g () {
+	git init 12g &&
+	(
+		cd 12g &&
+
+		mkdir -p subdir &&
+		test_write_lines upon a time there was a >somefile &&
+		test_write_lines 1 2 3 4 5 6 7 8 9 10 >subdir/a &&
+		test_write_lines one two three four five six >subdir/b &&
+		git add . &&
+		test_tick &&
+		git commit -m "O" &&
+
+		git branch O &&
+		git branch A &&
+		git branch B &&
+
+		git switch A &&
+		test_write_lines once upon a time there was a >somefile &&
+		> subdir/c &&
+		git add somefile subdir/c &&
+		test_tick &&
+		git commit -m "A" &&
+
+		git checkout B &&
+		git mv somefile newfile &&
+		git mv subdir newdir &&
+		echo repo >>newfile &&
+		test_write_lines 1 2 3 4 5 6 7 8 9 10 11 >newdir/a &&
+		test_write_lines one two three four five six seven >newdir/b &&
+		git add newfile newdir &&
+		test_tick &&
+		git commit -m "B"
+	)
+}
+
+test_expect_success '12g: Testcase with two kinds of "relevant" renames' '
+	test_setup_12g &&
+	(
+		cd 12g &&
+
+		git checkout A^0 &&
+
+		git -c merge.directoryRenames=true merge -s recursive B^0 &&
+
+		test_write_lines once upon a time there was a repo >expect &&
+		test_cmp expect newfile &&
+
+		git ls-files -s >out &&
+		test_line_count = 4 out &&
+
+		git rev-parse >actual \
+			HEAD:newdir/a  HEAD:newdir/b   HEAD:newdir/c &&
+		git rev-parse >expect \
+			B:newdir/a     B:newdir/b      A:subdir/c &&
+		test_cmp expect actual &&
+
+		test_must_fail git rev-parse HEAD:subdir/a &&
+		test_must_fail git rev-parse HEAD:subdir/b &&
+		test_must_fail git rev-parse HEAD:subdir/c &&
+		test_path_is_missing subdir/ &&
+		test_path_is_file newdir/c
+	)
+'
+
+# Testcase 12h, Testcase with two kinds of "relevant" renames
+#   Commit O: olddir/{a_1, b}
+#   Commit A: newdir/{a_2, b}
+#   Commit B: olddir/{alpha_1, b}
+#   Expected: newdir/{alpha_2, b}
+
+test_setup_12h () {
+	git init 12h &&
+	(
+		cd 12h &&
+
+		mkdir olddir &&
+		test_seq 3 8 >olddir/a &&
+		>olddir/b &&
+		git add olddir &&
+		git commit -m orig &&
+
+		git branch O &&
+		git branch A &&
+		git branch B &&
+
+		git switch A &&
+		test_seq 3 10 >olddir/a &&
+		git add olddir/a &&
+		git mv olddir newdir &&
+		git commit -m A &&
+
+		git switch B &&
+
+		git mv olddir/a olddir/alpha &&
+		git commit -m B
+	)
+}
+
+test_expect_failure '12h: renaming a file within a renamed directory' '
+	test_setup_12h &&
+	(
+		cd 12h &&
+
+		git checkout A^0 &&
+
+		test_might_fail git -c merge.directoryRenames=true merge -s recursive B^0 &&
+
+		git ls-files >tracked &&
+		test_line_count = 2 tracked &&
+
+		test_path_is_missing olddir/a &&
+		test_path_is_file newdir/alpha &&
+		test_path_is_file newdir/b &&
+
+		git rev-parse >actual \
+			HEAD:newdir/alpha  HEAD:newdir/b &&
+		git rev-parse >expect \
+			A:newdir/a         O:oldir/b &&
+		test_cmp expect actual
+	)
+'
+
+# Testcase 12i, Directory rename causes rename-to-self
+#   Commit O: source/{subdir/foo, bar, baz_1}
+#   Commit A: source/{foo, bar, baz_1}
+#   Commit B: source/{subdir/{foo, bar}, baz_2}
+#   Expected: source/{foo, bar, baz_2}, with conflicts on
+#                source/bar vs. source/subdir/bar
+
+test_setup_12i () {
+	git init 12i &&
+	(
+		cd 12i &&
+
+		mkdir -p source/subdir &&
+		echo foo >source/subdir/foo &&
+		echo bar >source/bar &&
+		echo baz >source/baz &&
+		git add source &&
+		git commit -m orig &&
+
+		git branch O &&
+		git branch A &&
+		git branch B &&
+
+		git switch A &&
+		git mv source/subdir/foo source/foo &&
+		git commit -m A &&
+
+		git switch B &&
+		git mv source/bar source/subdir/bar &&
+		echo more baz >>source/baz &&
+		git commit -m B
+	)
+}
+
+test_expect_success '12i: Directory rename causes rename-to-self' '
+	test_setup_12i &&
+	(
+		cd 12i &&
+
+		git checkout A^0 &&
+
+		test_must_fail git -c merge.directoryRenames=conflict merge -s recursive B^0 &&
+
+		test_path_is_missing source/subdir &&
+		test_path_is_file source/bar &&
+		test_path_is_file source/baz &&
+
+		git ls-files | uniq >tracked &&
+		test_line_count = 3 tracked &&
+
+		git status --porcelain -uno >actual &&
+		cat >expect <<-\EOF &&
+		UU source/bar
+		 M source/baz
+		EOF
+		test_cmp expect actual
+	)
+'
+
+# Testcase 12j, Directory rename to root causes rename-to-self
+#   Commit O: {subdir/foo, bar, baz_1}
+#   Commit A: {foo, bar, baz_1}
+#   Commit B: {subdir/{foo, bar}, baz_2}
+#   Expected: {foo, bar, baz_2}, with conflicts on bar vs. subdir/bar
+
+test_setup_12j () {
+	git init 12j &&
+	(
+		cd 12j &&
+
+		mkdir -p subdir &&
+		echo foo >subdir/foo &&
+		echo bar >bar &&
+		echo baz >baz &&
+		git add . &&
+		git commit -m orig &&
+
+		git branch O &&
+		git branch A &&
+		git branch B &&
+
+		git switch A &&
+		git mv subdir/foo foo &&
+		git commit -m A &&
+
+		git switch B &&
+		git mv bar subdir/bar &&
+		echo more baz >>baz &&
+		git commit -m B
+	)
+}
+
+test_expect_success '12j: Directory rename to root causes rename-to-self' '
+	test_setup_12j &&
+	(
+		cd 12j &&
+
+		git checkout A^0 &&
+
+		test_must_fail git -c merge.directoryRenames=conflict merge -s recursive B^0 &&
+
+		test_path_is_missing subdir &&
+		test_path_is_file bar &&
+		test_path_is_file baz &&
+
+		git ls-files | uniq >tracked &&
+		test_line_count = 3 tracked &&
+
+		git status --porcelain -uno >actual &&
+		cat >expect <<-\EOF &&
+		UU bar
+		 M baz
+		EOF
+		test_cmp expect actual
+	)
+'
+
+# Testcase 12k, Directory rename with sibling causes rename-to-self
+#   Commit O: dirB/foo, dirA/{bar, baz_1}
+#   Commit A: dirA/{foo, bar, baz_1}
+#   Commit B: dirB/{foo, bar}, dirA/baz_2
+#   Expected: dirA/{foo, bar, baz_2}, with conflicts on dirA/bar vs. dirB/bar
+
+test_setup_12k () {
+	git init 12k &&
+	(
+		cd 12k &&
+
+		mkdir dirA dirB &&
+		echo foo >dirB/foo &&
+		echo bar >dirA/bar &&
+		echo baz >dirA/baz &&
+		git add . &&
+		git commit -m orig &&
+
+		git branch O &&
+		git branch A &&
+		git branch B &&
+
+		git switch A &&
+		git mv dirB/* dirA/ &&
+		git commit -m A &&
+
+		git switch B &&
+		git mv dirA/bar dirB/bar &&
+		echo more baz >>dirA/baz &&
+		git commit -m B
+	)
+}
+
+test_expect_success '12k: Directory rename with sibling causes rename-to-self' '
+	test_setup_12k &&
+	(
+		cd 12k &&
+
+		git checkout A^0 &&
+
+		test_must_fail git -c merge.directoryRenames=conflict merge -s recursive B^0 &&
+
+		test_path_is_missing dirB &&
+		test_path_is_file dirA/bar &&
+		test_path_is_file dirA/baz &&
+
+		git ls-files | uniq >tracked &&
+		test_line_count = 3 tracked &&
+
+		git status --porcelain -uno >actual &&
+		cat >expect <<-\EOF &&
+		UU dirA/bar
+		 M dirA/baz
+		EOF
+		test_cmp expect actual
+	)
+'
+
+# Testcase 12l, Both sides rename a directory into the other side, both add
+#   a file which after directory renames are the same filename
+#   Commit O: sub1/file,                 sub2/other
+#   Commit A: sub3/file,                 sub2/{other, new_add_add_file_1}
+#   Commit B: sub1/{file, newfile}, sub1/sub2/{other, new_add_add_file_2}
+#
+#   In words:
+#     A: sub1/ -> sub3/, add sub2/new_add_add_file_1
+#     B: sub2/ -> sub1/sub2, add sub1/newfile, add sub1/sub2/new_add_add_file_2
+#
+#   Expected: sub3/{file, newfile, sub2/other}
+#             CONFLICT (add/add): sub1/sub2/new_add_add_file
+#
+#   Note that sub1/newfile is not extraneous.  Directory renames are only
+#   detected if they are needed, and they are only needed if the old directory
+#   had a new file added on the opposite side of history.  So sub1/newfile
+#   is needed for there to be a sub1/ -> sub3/ rename.
+
+test_setup_12l () {
+	git init 12l_$1 &&
+	(
+		cd 12l_$1 &&
+
+		mkdir sub1 sub2
+		echo file >sub1/file &&
+		echo other >sub2/other &&
+		git add sub1 sub2 &&
+		git commit -m "O" &&
+
+		git branch O &&
+		git branch A &&
+		git branch B &&
+
+		git checkout A &&
+		git mv sub1 sub3 &&
+		echo conflicting >sub2/new_add_add_file &&
+		git add sub2 &&
+		test_tick &&
+		git add -u &&
+		git commit -m "A" &&
+
+		git checkout B &&
+		echo dissimilar >sub2/new_add_add_file &&
+		echo brand >sub1/newfile &&
+		git add sub1 sub2 &&
+		git mv sub2 sub1 &&
+		test_tick &&
+		git commit -m "B"
+	)
+}
+
+test_expect_merge_algorithm failure success '12l (B into A): Rename into each other + add/add conflict' '
+	test_setup_12l BintoA &&
+	(
+		cd 12l_BintoA &&
+
+		git checkout -q A^0 &&
+
+		test_must_fail git -c merge.directoryRenames=true merge -s recursive B^0 &&
+
+		test_stdout_line_count = 5 git ls-files -s &&
+
+		git rev-parse >actual \
+			:0:sub3/file :0:sub3/newfile :0:sub3/sub2/other \
+			:2:sub1/sub2/new_add_add_file \
+			:3:sub1/sub2/new_add_add_file &&
+		git rev-parse >expect \
+			O:sub1/file  B:sub1/newfile O:sub2/other \
+			A:sub2/new_add_add_file \
+			B:sub1/sub2/new_add_add_file &&
+		test_cmp expect actual &&
+
+		git ls-files -o >actual &&
+		test_write_lines actual expect >expect &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_merge_algorithm failure success '12l (A into B): Rename into each other + add/add conflict' '
+	test_setup_12l AintoB &&
+	(
+		cd 12l_AintoB &&
+
+		git checkout -q B^0 &&
+
+		test_must_fail git -c merge.directoryRenames=true merge -s recursive A^0 &&
+
+		test_stdout_line_count = 5 git ls-files -s &&
+
+		git rev-parse >actual \
+			:0:sub3/file :0:sub3/newfile :0:sub3/sub2/other \
+			:2:sub1/sub2/new_add_add_file \
+			:3:sub1/sub2/new_add_add_file &&
+		git rev-parse >expect \
+			O:sub1/file  B:sub1/newfile O:sub2/other \
+			B:sub1/sub2/new_add_add_file \
+			A:sub2/new_add_add_file &&
+		test_cmp expect actual &&
+
+		git ls-files -o >actual &&
+		test_write_lines actual expect >expect &&
+		test_cmp expect actual
+	)
+'
+
+# Testcase 12m, Directory rename, plus change of parent dir to symlink
+#   Commit O:  dir/subdir/file
+#   Commit A:  renamed-dir/subdir/file
+#   Commit B:  dir/subdir
+#   In words:
+#     A: dir/subdir/ -> renamed-dir/subdir
+#     B: delete dir/subdir/file, add dir/subdir as symlink
+#
+#   Expected: CONFLICT (rename/delete): renamed-dir/subdir/file,
+#             CONFLICT (file location): renamed-dir/subdir vs. dir/subdir
+#             CONFLICT (directory/file): renamed-dir/subdir symlink has
+#                                        renamed-dir/subdir in the way
+
+test_setup_12m () {
+	git init 12m &&
+	(
+		cd 12m &&
+
+		mkdir -p dir/subdir &&
+		echo 1 >dir/subdir/file &&
+		git add . &&
+		git commit -m "O" &&
+
+		git branch O &&
+		git branch A &&
+		git branch B &&
+
+		git switch A &&
+		git mv dir/ renamed-dir/ &&
+		git add . &&
+		git commit -m "A" &&
+
+		git switch B &&
+		git rm dir/subdir/file &&
+		mkdir dir &&
+		ln -s /dev/null dir/subdir &&
+		git add . &&
+		git commit -m "B"
+	)
+}
+
+test_expect_merge_algorithm failure success '12m: Change parent of renamed-dir to symlink on other side' '
+	test_setup_12m &&
+	(
+		cd 12m &&
+
+		git checkout -q A^0 &&
+
+		test_must_fail git -c merge.directoryRenames=conflict merge -s recursive B^0 &&
+
+		test_stdout_line_count = 3 git ls-files -s &&
+		test_stdout_line_count = 2 ls -1 renamed-dir &&
+		test_path_is_missing dir
+	)
+'
+
 ###########################################################################
 # SECTION 13: Checking informational and conflict messages
 #
@@ -4236,7 +5378,7 @@ test_expect_success '12e: Rename/merge subdir into the root, variant 2' '
 #   Expected: y/{b,c,d,e/f}, with notices/conflicts for both y/d and y/e/f
 
 test_setup_13a () {
-	test_create_repo 13a_$1 &&
+	git init 13a_$1 &&
 	(
 		cd 13a_$1 &&
 
@@ -4275,8 +5417,8 @@ test_expect_success '13a(conflict): messages for newly added files' '
 
 		test_must_fail git merge -s recursive B^0 >out 2>err &&
 
-		test_i18ngrep CONFLICT..file.location.*z/e/f.added.in.B^0.*y/e/f out &&
-		test_i18ngrep CONFLICT..file.location.*z/d.added.in.B^0.*y/d out &&
+		test_grep CONFLICT..file.location.*z/e/f.added.in.B^0.*y/e/f out &&
+		test_grep CONFLICT..file.location.*z/d.added.in.B^0.*y/d out &&
 
 		git ls-files >paths &&
 		! grep z/ paths &&
@@ -4299,8 +5441,8 @@ test_expect_success '13a(info): messages for newly added files' '
 
 		git -c merge.directoryRenames=true merge -s recursive B^0 >out 2>err &&
 
-		test_i18ngrep Path.updated:.*z/e/f.added.in.B^0.*y/e/f out &&
-		test_i18ngrep Path.updated:.*z/d.added.in.B^0.*y/d out &&
+		test_grep Path.updated:.*z/e/f.added.in.B^0.*y/e/f out &&
+		test_grep Path.updated:.*z/d.added.in.B^0.*y/d out &&
 
 		git ls-files >paths &&
 		! grep z/ paths &&
@@ -4323,7 +5465,7 @@ test_expect_success '13a(info): messages for newly added files' '
 #             one about content, and one about file location
 
 test_setup_13b () {
-	test_create_repo 13b_$1 &&
+	git init 13b_$1 &&
 	(
 		cd 13b_$1 &&
 
@@ -4365,8 +5507,8 @@ test_expect_success '13b(conflict): messages for transitive rename with conflict
 
 		test_must_fail git merge -s recursive B^0 >out 2>err &&
 
-		test_i18ngrep CONFLICT.*content.*Merge.conflict.in.y/d out &&
-		test_i18ngrep CONFLICT..file.location.*x/d.renamed.to.z/d.*moved.to.y/d out &&
+		test_grep CONFLICT.*content.*Merge.conflict.in.y/d out &&
+		test_grep CONFLICT..file.location.*x/d.renamed.to.z/d.*moved.to.y/d out &&
 
 		git ls-files >paths &&
 		! grep z/ paths &&
@@ -4387,8 +5529,8 @@ test_expect_success '13b(info): messages for transitive rename with conflicted c
 
 		test_must_fail git -c merge.directoryRenames=true merge -s recursive B^0 >out 2>err &&
 
-		test_i18ngrep CONFLICT.*content.*Merge.conflict.in.y/d out &&
-		test_i18ngrep Path.updated:.*x/d.renamed.to.z/d.in.B^0.*moving.it.to.y/d out &&
+		test_grep CONFLICT.*content.*Merge.conflict.in.y/d out &&
+		test_grep Path.updated:.*x/d.renamed.to.z/d.in.B^0.*moving.it.to.y/d out &&
 
 		git ls-files >paths &&
 		! grep z/ paths &&
@@ -4403,14 +5545,14 @@ test_expect_success '13b(info): messages for transitive rename with conflicted c
 #   Commit O: z/{b,c},   x/{d,e}
 #   Commit A: y/{b,c,d}, x/e
 #   Commit B: z/{b,c,d}, x/e
-#   Expected: y/{b,c,d}, with info or conflict messages for d (
+#   Expected: y/{b,c,d}, x/e, with info or conflict messages for d
 #             A: renamed x/d -> z/d; B: renamed z/ -> y/ AND renamed x/d to y/d
 #             One could argue A had partial knowledge of what was done with
 #             d and B had full knowledge, but that's a slippery slope as
 #             shown in testcase 13d.
 
 test_setup_13c () {
-	test_create_repo 13c_$1 &&
+	git init 13c_$1 &&
 	(
 		cd 13c_$1 &&
 
@@ -4451,7 +5593,7 @@ test_expect_success '13c(conflict): messages for rename/rename(1to1) via transit
 
 		test_must_fail git merge -s recursive B^0 >out 2>err &&
 
-		test_i18ngrep CONFLICT..file.location.*x/d.renamed.to.z/d.*moved.to.y/d out &&
+		test_grep CONFLICT..file.location.*x/d.renamed.to.z/d.*moved.to.y/d out &&
 
 		git ls-files >paths &&
 		! grep z/ paths &&
@@ -4472,7 +5614,7 @@ test_expect_success '13c(info): messages for rename/rename(1to1) via transitive
 
 		git -c merge.directoryRenames=true merge -s recursive B^0 >out 2>err &&
 
-		test_i18ngrep Path.updated:.*x/d.renamed.to.z/d.in.B^0.*moving.it.to.y/d out &&
+		test_grep Path.updated:.*x/d.renamed.to.z/d.in.B^0.*moving.it.to.y/d out &&
 
 		git ls-files >paths &&
 		! grep z/ paths &&
@@ -4498,7 +5640,7 @@ test_expect_success '13c(info): messages for rename/rename(1to1) via transitive
 #               No conflict in where a/y ends up, so put it in d/y.
 
 test_setup_13d () {
-	test_create_repo 13d_$1 &&
+	git init 13d_$1 &&
 	(
 		cd 13d_$1 &&
 
@@ -4540,8 +5682,8 @@ test_expect_success '13d(conflict): messages for rename/rename(1to1) via dual tr
 
 		test_must_fail git merge -s recursive B^0 >out 2>err &&
 
-		test_i18ngrep CONFLICT..file.location.*a/y.renamed.to.b/y.*moved.to.d/y out &&
-		test_i18ngrep CONFLICT..file.location.*a/y.renamed.to.c/y.*moved.to.d/y out &&
+		test_grep CONFLICT..file.location.*a/y.renamed.to.b/y.*moved.to.d/y out &&
+		test_grep CONFLICT..file.location.*a/y.renamed.to.c/y.*moved.to.d/y out &&
 
 		git ls-files >paths &&
 		! grep b/ paths &&
@@ -4564,8 +5706,8 @@ test_expect_success '13d(info): messages for rename/rename(1to1) via dual transi
 
 		git -c merge.directoryRenames=true merge -s recursive B^0 >out 2>err &&
 
-		test_i18ngrep Path.updated.*a/y.renamed.to.b/y.*moving.it.to.d/y out &&
-		test_i18ngrep Path.updated.*a/y.renamed.to.c/y.*moving.it.to.d/y out &&
+		test_grep Path.updated.*a/y.renamed.to.b/y.*moving.it.to.d/y out &&
+		test_grep Path.updated.*a/y.renamed.to.c/y.*moving.it.to.d/y out &&
 
 		git ls-files >paths &&
 		! grep b/ paths &&
@@ -4624,7 +5766,7 @@ test_expect_success '13d(info): messages for rename/rename(1to1) via dual transi
 #          least avoids hitting a BUG().
 #
 test_setup_13e () {
-	test_create_repo 13e &&
+	git init 13e &&
 	(
 		cd 13e &&
 
@@ -4679,9 +5821,9 @@ test_expect_success '13e: directory rename detection in recursive case' '
 
 		git -c merge.directoryRenames=conflict merge -s recursive C^0 >out 2>err &&
 
-		test_i18ngrep ! CONFLICT out &&
-		test_i18ngrep ! BUG: err &&
-		test_i18ngrep ! core.dumped err &&
+		test_grep ! CONFLICT out &&
+		test_grep ! BUG: err &&
+		test_grep ! core.dumped err &&
 		test_must_be_empty err &&
 
 		git ls-files >paths &&
diff --git a/t/t6044-merge-unrelated-index-changes.sh b/t/t6424-merge-unrelated-index-changes.sh
index 5e3779e..7677c5f 100755
--- a/t/t6044-merge-unrelated-index-changes.sh
+++ b/t/t6424-merge-unrelated-index-changes.sh
@@ -71,7 +71,9 @@ test_expect_success 'ff update' '
 	git merge E^0 &&
 
 	test_must_fail git rev-parse HEAD:random_file &&
-	test "$(git diff --name-only --cached E)" = "random_file"
+	test "$(git diff --name-only --cached E)" = "random_file" &&
+	test_path_is_file random_file &&
+	git rev-parse --verify :random_file
 '
 
 test_expect_success 'ff update, important file modified' '
@@ -83,6 +85,8 @@ test_expect_success 'ff update, important file modified' '
 	git add subdir/e &&
 
 	test_must_fail git merge E^0 &&
+	test_path_is_file subdir/e &&
+	git rev-parse --verify :subdir/e &&
 	test_path_is_missing .git/MERGE_HEAD
 '
 
@@ -93,6 +97,8 @@ test_expect_success 'resolve, trivial' '
 	touch random_file && git add random_file &&
 
 	test_must_fail git merge -s resolve C^0 &&
+	test_path_is_file random_file &&
+	git rev-parse --verify :random_file &&
 	test_path_is_missing .git/MERGE_HEAD
 '
 
@@ -103,6 +109,41 @@ test_expect_success 'resolve, non-trivial' '
 	touch random_file && git add random_file &&
 
 	test_must_fail git merge -s resolve D^0 &&
+	test_path_is_file random_file &&
+	git rev-parse --verify :random_file &&
+	test_path_is_missing .git/MERGE_HEAD
+'
+
+test_expect_success 'resolve, trivial, related file removed' '
+	git reset --hard &&
+	git checkout B^0 &&
+
+	git rm a &&
+	test_path_is_missing a &&
+
+	test_must_fail git merge -s resolve C^0 &&
+
+	test_path_is_missing a &&
+	test_path_is_missing .git/MERGE_HEAD
+'
+
+test_expect_success 'resolve, non-trivial, related file removed' '
+	git reset --hard &&
+	git checkout B^0 &&
+
+	git rm a &&
+	test_path_is_missing a &&
+
+	# We also ask for recursive in order to turn off the "allow_trivial"
+	# setting in builtin/merge.c, and ensure that resolve really does
+	# correctly fail the merge (I guess this also tests that recursive
+	# correctly fails the merge, but the main thing we are attempting
+	# to test here is resolve and are just using the side effect of
+	# adding recursive to ensure that resolve is actually tested rather
+	# than the trivial merge codepath)
+	test_must_fail git merge -s resolve -s recursive D^0 &&
+
+	test_path_is_missing a &&
 	test_path_is_missing .git/MERGE_HEAD
 '
 
@@ -113,6 +154,8 @@ test_expect_success 'recursive' '
 	touch random_file && git add random_file &&
 
 	test_must_fail git merge -s recursive C^0 &&
+	test_path_is_file random_file &&
+	git rev-parse --verify :random_file &&
 	test_path_is_missing .git/MERGE_HEAD
 '
 
@@ -132,9 +175,10 @@ test_expect_success 'merge-recursive, when index==head but head!=HEAD' '
 
 	# Make index match B
 	git diff C B -- | git apply --cached &&
+	test_when_finished "git clean -fd" &&  # Do not leave untracked around
 	# Merge B & F, with B as "head"
 	git merge-recursive A -- B F > out &&
-	test_i18ngrep "Already up to date" out
+	test_grep "Already up to date" out
 '
 
 test_expect_success 'recursive, when file has staged changes not matching HEAD nor what a merge would give' '
@@ -144,10 +188,13 @@ test_expect_success 'recursive, when file has staged changes not matching HEAD n
 	mkdir subdir &&
 	test_seq 1 10 >subdir/a &&
 	git add subdir/a &&
+	git rev-parse --verify :subdir/a >expect &&
 
 	# We have staged changes; merge should error out
 	test_must_fail git merge -s recursive E^0 2>err &&
-	test_i18ngrep "changes to the following files would be overwritten" err
+	git rev-parse --verify :subdir/a >actual &&
+	test_cmp expect actual &&
+	test_grep "changes to the following files would be overwritten" err
 '
 
 test_expect_success 'recursive, when file has staged changes matching what a merge would give' '
@@ -157,10 +204,13 @@ test_expect_success 'recursive, when file has staged changes matching what a mer
 	mkdir subdir &&
 	test_seq 1 11 >subdir/a &&
 	git add subdir/a &&
+	git rev-parse --verify :subdir/a >expect &&
 
 	# We have staged changes; merge should error out
 	test_must_fail git merge -s recursive E^0 2>err &&
-	test_i18ngrep "changes to the following files would be overwritten" err
+	git rev-parse --verify :subdir/a >actual &&
+	test_cmp expect actual &&
+	test_grep "changes to the following files would be overwritten" err
 '
 
 test_expect_success 'octopus, unrelated file touched' '
@@ -170,7 +220,9 @@ test_expect_success 'octopus, unrelated file touched' '
 	touch random_file && git add random_file &&
 
 	test_must_fail git merge C^0 D^0 &&
-	test_path_is_missing .git/MERGE_HEAD
+	test_path_is_missing .git/MERGE_HEAD &&
+	git rev-parse --verify :random_file &&
+	test_path_exists random_file
 '
 
 test_expect_success 'octopus, related file removed' '
@@ -180,6 +232,8 @@ test_expect_success 'octopus, related file removed' '
 	git rm b &&
 
 	test_must_fail git merge C^0 D^0 &&
+	test_path_is_missing b &&
+	test_must_fail git rev-parse --verify :b &&
 	test_path_is_missing .git/MERGE_HEAD
 '
 
@@ -188,8 +242,12 @@ test_expect_success 'octopus, related file modified' '
 	git checkout B^0 &&
 
 	echo 12 >>a && git add a &&
+	git rev-parse --verify :a >expect &&
 
 	test_must_fail git merge C^0 D^0 &&
+	test_path_is_file a &&
+	git rev-parse --verify :a >actual &&
+	test_cmp expect actual &&
 	test_path_is_missing .git/MERGE_HEAD
 '
 
@@ -200,6 +258,8 @@ test_expect_success 'ours' '
 	touch random_file && git add random_file &&
 
 	test_must_fail git merge -s ours C^0 &&
+	test_path_is_file random_file &&
+	git rev-parse --verify :random_file &&
 	test_path_is_missing .git/MERGE_HEAD
 '
 
@@ -210,7 +270,41 @@ test_expect_success 'subtree' '
 	touch random_file && git add random_file &&
 
 	test_must_fail git merge -s subtree E^0 &&
+	test_path_is_file random_file &&
+	git rev-parse --verify :random_file &&
 	test_path_is_missing .git/MERGE_HEAD
 '
 
+test_expect_success 'avoid failure due to stat-dirty files' '
+	git reset --hard &&
+	git checkout B^0 &&
+
+	# Make "a" be stat-dirty
+	test-tool chmtime =+1 a &&
+
+	# stat-dirty file should not prevent stash creation in builtin/merge.c
+	git merge -s resolve -s recursive D^0
+'
+
+test_expect_success 'with multiple strategies, recursive or ort failure do not early abort' '
+	git reset --hard &&
+	git checkout B^0 &&
+
+	test_seq 0 10 >a &&
+	git add a &&
+	git rev-parse :a >expect &&
+
+	sane_unset GIT_TEST_MERGE_ALGORITHM &&
+	test_must_fail git merge -s recursive -s ort -s octopus C^0 >output 2>&1 &&
+
+	grep "Trying merge strategy recursive..." output &&
+	grep "Trying merge strategy ort..." output &&
+	grep "Trying merge strategy octopus..." output &&
+	grep "No merge strategy handled the merge." output &&
+
+	# Changes to "a" should remain staged
+	git rev-parse :a >actual &&
+	test_cmp expect actual
+'
+
 test_done
diff --git a/t/t6045-merge-rename-delete.sh b/t/t6425-merge-rename-delete.sh
index 5d33577..b95b064 100755
--- a/t/t6045-merge-rename-delete.sh
+++ b/t/t6425-merge-rename-delete.sh
@@ -1,6 +1,10 @@
 #!/bin/sh
 
 test_description='Merge-recursive rename/delete conflict message'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'rename/delete' '
@@ -12,12 +16,13 @@ test_expect_success 'rename/delete' '
 	git mv A B &&
 	git commit -m "rename" &&
 
-	git checkout master &&
+	git checkout main &&
 	git rm A &&
 	git commit -m "delete" &&
 
 	test_must_fail git merge --strategy=recursive rename >output &&
-	test_i18ngrep "CONFLICT (rename/delete): A deleted in HEAD and renamed to B in rename. Version rename of B left in tree." output
+	test_grep "CONFLICT (rename/delete): A.* renamed .*to B.* in rename" output &&
+	test_grep "CONFLICT (rename/delete): A.*deleted in HEAD." output
 '
 
 test_done
diff --git a/t/t6046-merge-skip-unneeded-updates.sh b/t/t6426-merge-skip-unneeded-updates.sh
index 5a2d07e..b059475 100755
--- a/t/t6046-merge-skip-unneeded-updates.sh
+++ b/t/t6426-merge-skip-unneeded-updates.sh
@@ -23,6 +23,7 @@ test_description="merge cases"
 #                     files that might be renamed into each other's paths.)
 
 . ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-merge.sh
 
 
 ###########################################################################
@@ -37,7 +38,7 @@ test_description="merge cases"
 #   Expected: b_2
 
 test_setup_1a () {
-	test_create_repo 1a_$1 &&
+	git init 1a_$1 &&
 	(
 		cd 1a_$1 &&
 
@@ -135,7 +136,7 @@ test_expect_success '1a-R: Modify(A)/Modify(B), change on B subset of A' '
 #   Expected: c_2
 
 test_setup_2a () {
-	test_create_repo 2a_$1 &&
+	git init 2a_$1 &&
 	(
 		cd 2a_$1 &&
 
@@ -228,7 +229,7 @@ test_expect_success '2a-R: Modify/rename, merge into rename side' '
 #   Expected: c_2
 
 test_setup_2b () {
-	test_create_repo 2b_$1 &&
+	git init 2b_$1 &&
 	(
 		cd 2b_$1 &&
 
@@ -335,7 +336,7 @@ test_expect_success '2b-R: Rename+Mod(A)/Mod(B), B mods subset of A' '
 #         not make that particular mistake.
 
 test_setup_2c () {
-	test_create_repo 2c &&
+	git init 2c &&
 	(
 		cd 2c &&
 
@@ -374,45 +375,33 @@ test_expect_success '2c: Modify b & add c VS rename b->c' '
 		export GIT_MERGE_VERBOSITY &&
 		test_must_fail git merge -s recursive B^0 >out 2>err &&
 
-		test_i18ngrep "CONFLICT (rename/add): Rename b->c" out &&
+		test_grep "CONFLICT (.*/add):" out &&
 		test_must_be_empty err &&
 
-		# Make sure c WAS updated
+		git ls-files -s >index_files &&
+		test_line_count = 2 index_files &&
+
+		# Ensure b was removed
+		test_path_is_missing b &&
+
+		# Make sure c WAS updated...
 		test-tool chmtime --get c >new-mtime &&
-		test $(cat old-mtime) -lt $(cat new-mtime)
-
-		# FIXME: rename/add conflicts are horribly broken right now;
-		# when I get back to my patch series fixing it and
-		# rename/rename(2to1) conflicts to bring them in line with
-		# how add/add conflicts behave, then checks like the below
-		# could be added.  But that patch series is waiting until
-		# the rename-directory-detection series lands, which this
-		# is part of.  And in the mean time, I do not want to further
-		# enforce broken behavior.  So for now, the main test is the
-		# one above that err is an empty file.
-
-		#git ls-files -s >index_files &&
-		#test_line_count = 2 index_files &&
-
-		#git rev-parse >actual :2:c :3:c &&
-		#git rev-parse >expect A:b  A:c  &&
-		#test_cmp expect actual &&
-
-		#git cat-file -p A:b >>merged &&
-		#git cat-file -p A:c >>merge-me &&
-		#>empty &&
-		#test_must_fail git merge-file \
-		#	-L "Temporary merge branch 1" \
-		#	-L "" \
-		#	-L "Temporary merge branch 2" \
-		#	merged empty merge-me &&
-		#sed -e "s/^\([<=>]\)/\1\1\1/" merged >merged-internal &&
-
-		#git hash-object c               >actual &&
-		#git hash-object merged-internal >expect &&
-		#test_cmp expect actual &&
-
-		#test_path_is_missing b
+		test $(cat old-mtime) -lt $(cat new-mtime) &&
+
+		# ...and has correct index entries and working tree contents
+		git rev-parse >actual :2:c :3:c &&
+		git rev-parse >expect A:c  A:b  &&
+		test_cmp expect actual &&
+
+		git cat-file -p A:b >>merge-me &&
+		git cat-file -p A:c >>merged &&
+		>empty &&
+		test_must_fail git merge-file \
+			-L "HEAD" \
+			-L "" \
+			-L "B^0" \
+			merged empty merge-me &&
+		test_cmp merged c
 	)
 '
 
@@ -436,7 +425,7 @@ test_expect_success '2c: Modify b & add c VS rename b->c' '
 #   Expected: bar/{bq_2, whatever}
 
 test_setup_3a () {
-	test_create_repo 3a_$1 &&
+	git init 3a_$1 &&
 	(
 		cd 3a_$1 &&
 
@@ -491,7 +480,9 @@ test_expect_success '3a-L: bq_1->foo/bq_2 on A, foo/->bar/ on B' '
 		test_cmp expect actual &&
 
 		test_must_fail git rev-parse HEAD:bq HEAD:foo/bq &&
-		test_path_is_missing bq foo/bq foo/whatever
+		test_path_is_missing bq &&
+		test_path_is_missing foo/bq &&
+		test_path_is_missing foo/whatever
 	)
 '
 
@@ -521,7 +512,9 @@ test_expect_success '3a-R: bq_1->foo/bq_2 on A, foo/->bar/ on B' '
 		test_cmp expect actual &&
 
 		test_must_fail git rev-parse HEAD:bq HEAD:foo/bq &&
-		test_path_is_missing bq foo/bq foo/whatever
+		test_path_is_missing bq &&
+		test_path_is_missing foo/bq &&
+		test_path_is_missing foo/whatever
 	)
 '
 
@@ -532,7 +525,7 @@ test_expect_success '3a-R: bq_1->foo/bq_2 on A, foo/->bar/ on B' '
 #   Expected: bar/{bq_2, whatever}
 
 test_setup_3b () {
-	test_create_repo 3b_$1 &&
+	git init 3b_$1 &&
 	(
 		cd 3b_$1 &&
 
@@ -587,7 +580,9 @@ test_expect_success '3b-L: bq_1->foo/bq_2 on A, foo/->bar/ on B' '
 		test_cmp expect actual &&
 
 		test_must_fail git rev-parse HEAD:bq HEAD:foo/bq &&
-		test_path_is_missing bq foo/bq foo/whatever
+		test_path_is_missing bq &&
+		test_path_is_missing foo/bq &&
+		test_path_is_missing foo/whatever
 	)
 '
 
@@ -617,7 +612,9 @@ test_expect_success '3b-R: bq_1->foo/bq_2 on A, foo/->bar/ on B' '
 		test_cmp expect actual &&
 
 		test_must_fail git rev-parse HEAD:bq HEAD:foo/bq &&
-		test_path_is_missing bq foo/bq foo/whatever
+		test_path_is_missing bq &&
+		test_path_is_missing foo/bq &&
+		test_path_is_missing foo/whatever
 	)
 '
 
@@ -633,7 +630,7 @@ test_expect_success '3b-R: bq_1->foo/bq_2 on A, foo/->bar/ on B' '
 #   Expected: b_2 for merge, b_4 in working copy
 
 test_setup_4a () {
-	test_create_repo 4a &&
+	git init 4a &&
 	(
 		cd 4a &&
 
@@ -666,7 +663,7 @@ test_setup_4a () {
 #   correct requires doing the merge in-memory first, then realizing that no
 #   updates to the file are necessary, and thus that we can just leave the path
 #   alone.
-test_expect_failure '4a: Change on A, change on B subset of A, dirty mods present' '
+test_expect_merge_algorithm failure success '4a: Change on A, change on B subset of A, dirty mods present' '
 	test_setup_4a &&
 	(
 		cd 4a &&
@@ -705,7 +702,7 @@ test_expect_failure '4a: Change on A, change on B subset of A, dirty mods presen
 #   Expected: c_2
 
 test_setup_4b () {
-	test_create_repo 4b &&
+	git init 4b &&
 	(
 		cd 4b &&
 
diff --git a/t/t6047-diff3-conflict-markers.sh b/t/t6427-diff3-conflict-markers.sh
index f4655bb..dd5fe6a 100755
--- a/t/t6047-diff3-conflict-markers.sh
+++ b/t/t6427-diff3-conflict-markers.sh
@@ -2,6 +2,9 @@
 
 test_description='recursive merge diff3 style conflict markers'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 # Setup:
@@ -16,7 +19,7 @@ test_description='recursive merge diff3 style conflict markers'
 #
 
 test_expect_success 'setup no merge base' '
-	test_create_repo no_merge_base &&
+	git init no_merge_base &&
 	(
 		cd no_merge_base &&
 
@@ -43,7 +46,7 @@ test_expect_success 'check no merge base' '
 # Setup:
 #          L1
 #         /  \
-#   master    ?
+#     main    ?
 #         \  /
 #          R1
 #
@@ -52,7 +55,7 @@ test_expect_success 'check no merge base' '
 #
 
 test_expect_success 'setup unique merge base' '
-	test_create_repo unique_merge_base &&
+	git init unique_merge_base &&
 	(
 		cd unique_merge_base &&
 
@@ -90,18 +93,18 @@ test_expect_success 'check unique merge base' '
 		cd unique_merge_base &&
 
 		git checkout L^0 &&
-		MASTER=$(git rev-parse --short master) &&
+		MAIN=$(git rev-parse --short main) &&
 
 		test_must_fail git -c merge.conflictstyle=diff3 merge -s recursive R^0 &&
 
-		grep "|||||| $MASTER:content" renamed
+		grep "|||||| $MAIN:content" renamed
 	)
 '
 
 # Setup:
 #          L1---L2--L3
 #         /  \ /      \
-#   master    X1       ?
+#     main    X1       ?
 #         \  / \      /
 #          R1---R2--R3
 #
@@ -113,7 +116,7 @@ test_expect_success 'check unique merge base' '
 #
 
 test_expect_success 'setup multiple merge bases' '
-	test_create_repo multiple_merge_bases &&
+	git init multiple_merge_bases &&
 	(
 		cd multiple_merge_bases &&
 
@@ -187,14 +190,14 @@ test_expect_success 'check multiple merge bases' '
 '
 
 test_expect_success 'rebase --merge describes parent of commit being picked' '
-	test_create_repo rebase &&
+	git init rebase &&
 	(
 		cd rebase &&
 		test_commit base file &&
-		test_commit master file &&
+		test_commit main file &&
 		git checkout -b side HEAD^ &&
 		test_commit side file &&
-		test_must_fail git -c merge.conflictstyle=diff3 rebase --merge master &&
+		test_must_fail git -c merge.conflictstyle=diff3 rebase --merge main &&
 		grep "||||||| parent of" file
 	)
 '
@@ -203,9 +206,99 @@ test_expect_success 'rebase --apply describes fake ancestor base' '
 	(
 		cd rebase &&
 		git rebase --abort &&
-		test_must_fail git -c merge.conflictstyle=diff3 rebase --apply master &&
+		test_must_fail git -c merge.conflictstyle=diff3 rebase --apply main &&
 		grep "||||||| constructed merge base" file
 	)
 '
 
+test_setup_zdiff3 () {
+	git init zdiff3 &&
+	(
+		cd zdiff3 &&
+
+		test_write_lines 1 2 3 4 5 6 7 8 9 >basic &&
+		test_write_lines 1 2 3 AA 4 5 BB 6 7 8 >middle-common &&
+		test_write_lines 1 2 3 4 5 6 7 8 9 >interesting &&
+		test_write_lines 1 2 3 4 5 6 7 8 9 >evil &&
+
+		git add basic middle-common interesting evil &&
+		git commit -m base &&
+
+		git branch left &&
+		git branch right &&
+
+		git checkout left &&
+		test_write_lines 1 2 3 4 A B C D E 7 8 9 >basic &&
+		test_write_lines 1 2 3 CC 4 5 DD 6 7 8 >middle-common &&
+		test_write_lines 1 2 3 4 A B C D E F G H I J 7 8 9 >interesting &&
+		test_write_lines 1 2 3 4 X A B C 7 8 9 >evil &&
+		git add -u &&
+		git commit -m letters &&
+
+		git checkout right &&
+		test_write_lines 1 2 3 4 A X C Y E 7 8 9 >basic &&
+		test_write_lines 1 2 3 EE 4 5 FF 6 7 8 >middle-common &&
+		test_write_lines 1 2 3 4 A B C 5 6 G H I J 7 8 9 >interesting &&
+		test_write_lines 1 2 3 4 Y A B C B C 7 8 9 >evil &&
+		git add -u &&
+		git commit -m permuted
+	)
+}
+
+test_expect_success 'check zdiff3 markers' '
+	test_setup_zdiff3 &&
+	(
+		cd zdiff3 &&
+
+		git checkout left^0 &&
+
+		base=$(git rev-parse --short HEAD^1) &&
+		test_must_fail git -c merge.conflictstyle=zdiff3 merge -s recursive right^0 &&
+
+		test_write_lines 1 2 3 4 A \
+				 "<<<<<<< HEAD" B C D \
+				 "||||||| $base" 5 6 \
+				 ======= X C Y \
+				 ">>>>>>> right^0" \
+				 E 7 8 9 \
+				 >expect &&
+		test_cmp expect basic &&
+
+		test_write_lines 1 2 3 \
+				 "<<<<<<< HEAD" CC \
+				 "||||||| $base" AA \
+				 ======= EE \
+				 ">>>>>>> right^0" \
+				 4 5 \
+				 "<<<<<<< HEAD" DD \
+				 "||||||| $base" BB \
+				 ======= FF \
+				 ">>>>>>> right^0" \
+				 6 7 8 \
+				 >expect &&
+		test_cmp expect middle-common &&
+
+		test_write_lines 1 2 3 4 A B C \
+				 "<<<<<<< HEAD" D E F \
+				 "||||||| $base" 5 6 \
+				 ======= 5 6 \
+				 ">>>>>>> right^0" \
+				 G H I J 7 8 9 \
+				 >expect &&
+		test_cmp expect interesting &&
+
+		# Not passing this one yet; the common "B C" lines is still
+		# being left in the conflict blocks on the left and right
+		# sides.
+		test_write_lines 1 2 3 4 \
+				 "<<<<<<< HEAD" X A \
+				 "||||||| $base" 5 6 \
+				 ======= Y A B C \
+				 ">>>>>>> right^0" \
+				 B C 7 8 9 \
+				 >expect &&
+		test_cmp expect evil
+	)
+'
+
 test_done
diff --git a/t/t6428-merge-conflicts-sparse.sh b/t/t6428-merge-conflicts-sparse.sh
new file mode 100755
index 0000000..9919c3f
--- /dev/null
+++ b/t/t6428-merge-conflicts-sparse.sh
@@ -0,0 +1,145 @@
+#!/bin/sh
+
+test_description="merge cases"
+
+# The setup for all of them, pictorially, is:
+#
+#      A
+#      o
+#     / \
+#  O o   ?
+#     \ /
+#      o
+#      B
+#
+# To help make it easier to follow the flow of tests, they have been
+# divided into sections and each test will start with a quick explanation
+# of what commits O, A, and B contain.
+#
+# Notation:
+#    z/{b,c}   means  files z/b and z/c both exist
+#    x/d_1     means  file x/d exists with content d1.  (Purpose of the
+#                     underscore notation is to differentiate different
+#                     files that might be renamed into each other's paths.)
+
+. ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-merge.sh
+
+
+# Testcase basic, conflicting changes in 'numerals'
+
+test_setup_numerals () {
+	git init numerals_$1 &&
+	(
+		cd numerals_$1 &&
+
+		>README &&
+		test_write_lines I II III >numerals &&
+		git add README numerals &&
+		test_tick &&
+		git commit -m "O" &&
+
+		git branch O &&
+		git branch A &&
+		git branch B &&
+
+		git checkout A &&
+		test_write_lines I II III IIII >numerals &&
+		git add numerals &&
+		test_tick &&
+		git commit -m "A" &&
+
+		git checkout B &&
+		test_write_lines I II III IV >numerals &&
+		git add numerals &&
+		test_tick &&
+		git commit -m "B" &&
+
+		cat <<-EOF >expected-index &&
+		H README
+		M numerals
+		M numerals
+		M numerals
+		EOF
+
+		cat <<-EOF >expected-merge
+		I
+		II
+		III
+		<<<<<<< HEAD
+		IIII
+		=======
+		IV
+		>>>>>>> B^0
+		EOF
+
+	)
+}
+
+test_expect_success 'conflicting entries written to worktree even if sparse' '
+	test_setup_numerals plain &&
+	(
+		cd numerals_plain &&
+
+		git checkout A^0 &&
+
+		test_path_is_file README &&
+		test_path_is_file numerals &&
+
+		git sparse-checkout init &&
+		git sparse-checkout set --no-cone README &&
+
+		test_path_is_file README &&
+		test_path_is_missing numerals &&
+
+		test_must_fail git merge -s recursive B^0 &&
+
+		git ls-files -t >index_files &&
+		test_cmp expected-index index_files &&
+
+		test_path_is_file README &&
+		test_path_is_file numerals &&
+
+		test_cmp expected-merge numerals &&
+
+		# 4 other files:
+		#   * expected-merge
+		#   * expected-index
+		#   * index_files
+		#   * others
+		git ls-files -o >others &&
+		test_line_count = 4 others
+	)
+'
+
+test_expect_success 'present-despite-SKIP_WORKTREE handled reasonably' '
+	test_setup_numerals in_the_way &&
+	(
+		cd numerals_in_the_way &&
+
+		git checkout A^0 &&
+
+		test_path_is_file README &&
+		test_path_is_file numerals &&
+
+		git sparse-checkout init &&
+		git sparse-checkout set --no-cone README &&
+
+		test_path_is_file README &&
+		test_path_is_missing numerals &&
+
+		echo foobar >numerals &&
+
+		test_must_fail git merge -s recursive B^0 &&
+
+		test_path_is_missing .git/MERGE_HEAD &&
+
+		test_path_is_file numerals &&
+
+		# numerals should still have "foobar" in it
+		echo foobar >expect &&
+		test_cmp expect numerals
+	)
+'
+
+test_done
diff --git a/t/t6429-merge-sequence-rename-caching.sh b/t/t6429-merge-sequence-rename-caching.sh
new file mode 100755
index 0000000..0f39ed0
--- /dev/null
+++ b/t/t6429-merge-sequence-rename-caching.sh
@@ -0,0 +1,772 @@
+#!/bin/sh
+
+test_description="remember regular & dir renames in sequence of merges"
+
+. ./test-lib.sh
+
+#
+# NOTE 1: this testfile tends to not only rename files, but modify on both
+#         sides; without modifying on both sides, optimizations can kick in
+#         which make rename detection irrelevant or trivial.  We want to make
+#         sure that we are triggering rename caching rather than rename
+#         bypassing.
+#
+# NOTE 2: this testfile uses 'test-tool fast-rebase' instead of either
+#         cherry-pick or rebase.  sequencer.c is only superficially
+#         integrated with merge-ort; it calls merge_switch_to_result()
+#         after EACH merge, which updates the index and working copy AND
+#         throws away the cached results (because merge_switch_to_result()
+#         is only supposed to be called at the end of the sequence).
+#         Integrating them more deeply is a big task, so for now the tests
+#         use 'test-tool fast-rebase'.
+#
+
+
+#
+# In the following simple testcase:
+#   Base:     numbers_1, values_1
+#   Upstream: numbers_2, values_2
+#   Topic_1:  sequence_3
+#   Topic_2:  scruples_3
+# or, in english, rename numbers -> sequence in the first commit, and rename
+# values -> scruples in the second commit.
+#
+# This shouldn't be a challenge, it's just verifying that cached renames isn't
+# preventing us from finding new renames.
+#
+test_expect_success 'caching renames does not preclude finding new ones' '
+	git init caching-renames-and-new-renames &&
+	(
+		cd caching-renames-and-new-renames &&
+
+		test_seq 2 10 >numbers &&
+		test_seq 2 10 >values &&
+		git add numbers values &&
+		git commit -m orig &&
+
+		git branch upstream &&
+		git branch topic &&
+
+		git switch upstream &&
+		test_seq 1 10 >numbers &&
+		test_seq 1 10 >values &&
+		git add numbers values &&
+		git commit -m "Tweaked both files" &&
+
+		git switch topic &&
+
+		test_seq 2 12 >numbers &&
+		git add numbers &&
+		git mv numbers sequence &&
+		git commit -m A &&
+
+		test_seq 2 12 >values &&
+		git add values &&
+		git mv values scruples &&
+		git commit -m B &&
+
+		#
+		# Actual testing
+		#
+
+		git switch upstream &&
+
+		git replay --onto HEAD upstream~1..topic >out &&
+		git update-ref --stdin <out &&
+		git checkout topic &&
+
+		git ls-files >tracked-files &&
+		test_line_count = 2 tracked-files &&
+		test_seq 1 12 >expect &&
+		test_cmp expect sequence &&
+		test_cmp expect scruples
+	)
+'
+
+#
+# In the following testcase:
+#   Base:     numbers_1
+#   Upstream: rename numbers_1 -> sequence_2
+#   Topic_1:  numbers_3
+#   Topic_2:  numbers_1
+# or, in english, the first commit on the topic branch modifies numbers by
+# shrinking it (dramatically) and the second commit on topic reverts its
+# parent.
+#
+# Can git apply both patches?
+#
+# Traditional cherry-pick/rebase will fail to apply the second commit, the
+# one that reverted its parent, because despite detecting the rename from
+# 'numbers' to 'sequence' for the first commit, it fails to detect that
+# rename when picking the second commit.  That's "reasonable" given the
+# dramatic change in size of the file, but remembering the rename and
+# reusing it is reasonable too.
+#
+# We do test here that we expect rename detection to only be run once total
+# (the topic side of history doesn't need renames, and with caching we
+# should be able to only run rename detection on the upstream side one
+# time.)
+test_expect_success 'cherry-pick both a commit and its immediate revert' '
+	git init pick-commit-and-its-immediate-revert &&
+	(
+		cd pick-commit-and-its-immediate-revert &&
+
+		test_seq 11 30 >numbers &&
+		git add numbers &&
+		git commit -m orig &&
+
+		git branch upstream &&
+		git branch topic &&
+
+		git switch upstream &&
+		test_seq 1 30 >numbers &&
+		git add numbers &&
+		git mv numbers sequence &&
+		git commit -m "Renamed (and modified) numbers -> sequence" &&
+
+		git switch topic &&
+
+		test_seq 11 13 >numbers &&
+		git add numbers &&
+		git commit -m A &&
+
+		git revert HEAD &&
+
+		#
+		# Actual testing
+		#
+
+		git switch upstream &&
+
+		GIT_TRACE2_PERF="$(pwd)/trace.output" &&
+		export GIT_TRACE2_PERF &&
+
+		git replay --onto HEAD upstream~1..topic >out &&
+		git update-ref --stdin <out &&
+		git checkout topic &&
+
+		grep region_enter.*diffcore_rename trace.output >calls &&
+		test_line_count = 1 calls
+	)
+'
+
+#
+# In the following testcase:
+#   Base:     sequence_1
+#   Upstream: rename sequence_1 -> values_2
+#   Topic_1:  rename sequence_1 -> values_3
+#   Topic_2:  add unrelated sequence_4
+# or, in english, both sides rename sequence -> values, and then the second
+# commit on the topic branch adds an unrelated file called sequence.
+#
+# This testcase presents no problems for git traditionally, but having both
+# sides do the same rename in effect "uses it up" and if it remains cached,
+# could cause a spurious rename/add conflict.
+#
+test_expect_success 'rename same file identically, then reintroduce it' '
+	git init rename-rename-1to1-then-add-old-filename &&
+	(
+		cd rename-rename-1to1-then-add-old-filename &&
+
+		test_seq 3 8 >sequence &&
+		git add sequence &&
+		git commit -m orig &&
+
+		git branch upstream &&
+		git branch topic &&
+
+		git switch upstream &&
+		test_seq 1 8 >sequence &&
+		git add sequence &&
+		git mv sequence values &&
+		git commit -m "Renamed (and modified) sequence -> values" &&
+
+		git switch topic &&
+
+		test_seq 3 10 >sequence &&
+		git add sequence &&
+		git mv sequence values &&
+		git commit -m A &&
+
+		test_write_lines A B C D E F G H I J >sequence &&
+		git add sequence &&
+		git commit -m B &&
+
+		#
+		# Actual testing
+		#
+
+		git switch upstream &&
+
+		GIT_TRACE2_PERF="$(pwd)/trace.output" &&
+		export GIT_TRACE2_PERF &&
+
+		git replay --onto HEAD upstream~1..topic >out &&
+		git update-ref --stdin <out &&
+		git checkout topic &&
+
+		git ls-files >tracked &&
+		test_line_count = 2 tracked &&
+		test_path_is_file values &&
+		test_path_is_file sequence &&
+
+		grep region_enter.*diffcore_rename trace.output >calls &&
+		test_line_count = 2 calls
+	)
+'
+
+#
+# In the following testcase:
+#   Base:     olddir/{valuesZ_1, valuesY_1, valuesX_1}
+#   Upstream: rename olddir/valuesZ_1 -> dirA/valuesZ_2
+#             rename olddir/valuesY_1 -> dirA/valuesY_2
+#             rename olddir/valuesX_1 -> dirB/valuesX_2
+#   Topic_1:  rename olddir/valuesZ_1 -> dirA/valuesZ_3
+#             rename olddir/valuesY_1 -> dirA/valuesY_3
+#   Topic_2:  add olddir/newfile
+#   Expected Pick1: dirA/{valuesZ, valuesY}, dirB/valuesX
+#   Expected Pick2: dirA/{valuesZ, valuesY}, dirB/{valuesX, newfile}
+#
+# This testcase presents no problems for git traditionally, but having both
+# sides do the same renames in effect "use it up" but if the renames remain
+# cached, the directory rename could put newfile in the wrong directory.
+#
+test_expect_success 'rename same file identically, then add file to old dir' '
+	git init rename-rename-1to1-then-add-file-to-old-dir &&
+	(
+		cd rename-rename-1to1-then-add-file-to-old-dir &&
+
+		mkdir olddir/ &&
+		test_seq 3 8 >olddir/valuesZ &&
+		test_seq 3 8 >olddir/valuesY &&
+		test_seq 3 8 >olddir/valuesX &&
+		git add olddir &&
+		git commit -m orig &&
+
+		git branch upstream &&
+		git branch topic &&
+
+		git switch upstream &&
+		test_seq 1 8 >olddir/valuesZ &&
+		test_seq 1 8 >olddir/valuesY &&
+		test_seq 1 8 >olddir/valuesX &&
+		git add olddir &&
+		mkdir dirA &&
+		git mv olddir/valuesZ olddir/valuesY dirA &&
+		git mv olddir/ dirB/ &&
+		git commit -m "Renamed (and modified) values*" &&
+
+		git switch topic &&
+
+		test_seq 3 10 >olddir/valuesZ &&
+		test_seq 3 10 >olddir/valuesY &&
+		git add olddir &&
+		mkdir dirA &&
+		git mv olddir/valuesZ olddir/valuesY dirA &&
+		git commit -m A &&
+
+		>olddir/newfile &&
+		git add olddir/newfile &&
+		git commit -m B &&
+
+		#
+		# Actual testing
+		#
+
+		git switch upstream &&
+		git config merge.directoryRenames true &&
+
+		GIT_TRACE2_PERF="$(pwd)/trace.output" &&
+		export GIT_TRACE2_PERF &&
+
+		git replay --onto HEAD upstream~1..topic >out &&
+		git update-ref --stdin <out &&
+		git checkout topic &&
+
+		git ls-files >tracked &&
+		test_line_count = 4 tracked &&
+		test_path_is_file dirA/valuesZ &&
+		test_path_is_file dirA/valuesY &&
+		test_path_is_file dirB/valuesX &&
+		test_path_is_file dirB/newfile &&
+
+		grep region_enter.*diffcore_rename trace.output >calls &&
+		test_line_count = 3 calls
+	)
+'
+
+#
+# In the following testcase, upstream renames a directory, and the topic branch
+# first adds a file to the directory, then later renames the directory
+# differently:
+#   Base:     olddir/a
+#             olddir/b
+#   Upstream: rename olddir/ -> newdir/
+#   Topic_1:  add olddir/newfile
+#   Topic_2:  rename olddir/ -> otherdir/
+#
+# Here we are just concerned that cached renames might prevent us from seeing
+# the rename conflict, and we want to ensure that we do get a conflict.
+#
+# While at it, though, we do test that we only try to detect renames 2
+# times and not three.  (The first merge needs to detect renames on the
+# upstream side.  Traditionally, the second merge would need to detect
+# renames on both sides of history, but our caching of upstream renames
+# should avoid the need to re-detect upstream renames.)
+#
+test_expect_success 'cached dir rename does not prevent noticing later conflict' '
+	git init dir-rename-cache-not-occluding-later-conflict &&
+	(
+		cd dir-rename-cache-not-occluding-later-conflict &&
+
+		mkdir olddir &&
+		test_seq 3 10 >olddir/a &&
+		test_seq 3 10 >olddir/b &&
+		git add olddir &&
+		git commit -m orig &&
+
+		git branch upstream &&
+		git branch topic &&
+
+		git switch upstream &&
+		test_seq 3 10 >olddir/a &&
+		test_seq 3 10 >olddir/b &&
+		git add olddir &&
+		git mv olddir newdir &&
+		git commit -m "Dir renamed" &&
+
+		git switch topic &&
+
+		>olddir/newfile &&
+		git add olddir/newfile &&
+		git commit -m A &&
+
+		test_seq 1 8 >olddir/a &&
+		test_seq 1 8 >olddir/b &&
+		git add olddir &&
+		git mv olddir otherdir &&
+		git commit -m B &&
+
+		#
+		# Actual testing
+		#
+
+		git switch upstream &&
+		git config merge.directoryRenames true &&
+
+		GIT_TRACE2_PERF="$(pwd)/trace.output" &&
+		export GIT_TRACE2_PERF &&
+
+		test_must_fail git replay --onto HEAD upstream~1..topic >output &&
+
+		grep region_enter.*diffcore_rename trace.output >calls &&
+		test_line_count = 2 calls
+	)
+'
+
+# Helper for the next two tests
+test_setup_upstream_rename () {
+	git init $1 &&
+	(
+		cd $1 &&
+
+		test_seq 3 8 >somefile &&
+		test_seq 3 8 >relevant-rename &&
+		git add somefile relevant-rename &&
+		mkdir olddir &&
+		test_write_lines a b c d e f g >olddir/a &&
+		test_write_lines z y x w v u t >olddir/b &&
+		git add olddir &&
+		git commit -m orig &&
+
+		git branch upstream &&
+		git branch topic &&
+
+		git switch upstream &&
+		test_seq 1 8 >somefile &&
+		test_seq 1 8 >relevant-rename &&
+		git add somefile relevant-rename &&
+		git mv relevant-rename renamed &&
+		echo h >>olddir/a &&
+		echo s >>olddir/b &&
+		git add olddir &&
+		git mv olddir newdir &&
+		git commit -m "Dir renamed"
+	)
+}
+
+#
+# In the following testcase, upstream renames a file in the toplevel directory
+# as well as its only directory:
+#   Base:     relevant-rename_1
+#             somefile
+#             olddir/a
+#             olddir/b
+#   Upstream: rename relevant-rename_1 -> renamed_2
+#             rename olddir/           -> newdir/
+#   Topic_1:  relevant-rename_3
+#   Topic_2:  olddir/newfile_1
+#   Topic_3:  olddir/newfile_2
+#
+# In this testcase, since the first commit being picked only modifies a
+# file in the toplevel directory, the directory rename is irrelevant for
+# that first merge.  However, we need to notice the directory rename for
+# the merge that picks the second commit, and we don't want the third
+# commit to mess up its location either.  We want to make sure that
+# olddir/newfile doesn't exist in the result and that newdir/newfile does.
+#
+# We also test that we only do rename detection twice.  We never need
+# rename detection on the topic side of history, but we do need it twice on
+# the upstream side of history.  For the first topic commit, we only need
+# the
+#   relevant-rename -> renamed
+# rename, because olddir is unmodified by Topic_1.  For Topic_2, however,
+# the new file being added to olddir means files that were previously
+# irrelevant for rename detection are now relevant, forcing us to repeat
+# rename detection for the paths we don't already have cached.  Topic_3 also
+# tweaks olddir/newfile, but the renames in olddir/ will have been cached
+# from the second rename detection run.
+#
+test_expect_success 'dir rename unneeded, then add new file to old dir' '
+	test_setup_upstream_rename dir-rename-unneeded-until-new-file &&
+	(
+		cd dir-rename-unneeded-until-new-file &&
+
+		git switch topic &&
+
+		test_seq 3 10 >relevant-rename &&
+		git add relevant-rename &&
+		git commit -m A &&
+
+		echo foo >olddir/newfile &&
+		git add olddir/newfile &&
+		git commit -m B &&
+
+		echo bar >>olddir/newfile &&
+		git add olddir/newfile &&
+		git commit -m C &&
+
+		#
+		# Actual testing
+		#
+
+		git switch upstream &&
+		git config merge.directoryRenames true &&
+
+		GIT_TRACE2_PERF="$(pwd)/trace.output" &&
+		export GIT_TRACE2_PERF &&
+
+		git replay --onto HEAD upstream~1..topic >out &&
+		git update-ref --stdin <out &&
+		git checkout topic &&
+
+		grep region_enter.*diffcore_rename trace.output >calls &&
+		test_line_count = 2 calls &&
+
+		git ls-files >tracked &&
+		test_line_count = 5 tracked &&
+		test_path_is_missing olddir/newfile &&
+		test_path_is_file newdir/newfile
+	)
+'
+
+#
+# The following testcase is *very* similar to the last one, but instead of
+# adding a new olddir/newfile, it renames somefile -> olddir/newfile:
+#   Base:     relevant-rename_1
+#             somefile_1
+#             olddir/a
+#             olddir/b
+#   Upstream: rename relevant-rename_1 -> renamed_2
+#             rename olddir/           -> newdir/
+#   Topic_1:  relevant-rename_3
+#   Topic_2:  rename somefile -> olddir/newfile_2
+#   Topic_3:  modify olddir/newfile_3
+#
+# In this testcase, since the first commit being picked only modifies a
+# file in the toplevel directory, the directory rename is irrelevant for
+# that first merge.  However, we need to notice the directory rename for
+# the merge that picks the second commit, and we don't want the third
+# commit to mess up its location either.  We want to make sure that
+# neither somefile or olddir/newfile exists in the result and that
+# newdir/newfile does.
+#
+# This testcase needs one more call to rename detection than the last
+# testcase, because of the somefile -> olddir/newfile rename in Topic_2.
+test_expect_success 'dir rename unneeded, then rename existing file into old dir' '
+	test_setup_upstream_rename dir-rename-unneeded-until-file-moved-inside &&
+	(
+		cd dir-rename-unneeded-until-file-moved-inside &&
+
+		git switch topic &&
+
+		test_seq 3 10 >relevant-rename &&
+		git add relevant-rename &&
+		git commit -m A &&
+
+		test_seq 1 10 >somefile &&
+		git add somefile &&
+		git mv somefile olddir/newfile &&
+		git commit -m B &&
+
+		test_seq 1 12 >olddir/newfile &&
+		git add olddir/newfile &&
+		git commit -m C &&
+
+		#
+		# Actual testing
+		#
+
+		git switch upstream &&
+		git config merge.directoryRenames true &&
+
+		GIT_TRACE2_PERF="$(pwd)/trace.output" &&
+		export GIT_TRACE2_PERF &&
+
+		git replay --onto HEAD upstream~1..topic >out &&
+		git update-ref --stdin <out &&
+		git checkout topic &&
+
+		grep region_enter.*diffcore_rename trace.output >calls &&
+		test_line_count = 3 calls &&
+
+		test_path_is_missing somefile &&
+		test_path_is_missing olddir/newfile &&
+		test_path_is_file newdir/newfile &&
+		git ls-files >tracked &&
+		test_line_count = 4 tracked
+	)
+'
+
+# Helper for the next two tests
+test_setup_topic_rename () {
+	git init $1 &&
+	(
+		cd $1 &&
+
+		test_seq 3 8 >somefile &&
+		mkdir olddir &&
+		test_seq 3 8 >olddir/a &&
+		echo b >olddir/b &&
+		git add olddir somefile &&
+		git commit -m orig &&
+
+		git branch upstream &&
+		git branch topic &&
+
+		git switch topic &&
+		test_seq 1 8 >somefile &&
+		test_seq 1 8 >olddir/a &&
+		git add somefile olddir/a &&
+		git mv olddir newdir &&
+		git commit -m "Dir renamed" &&
+
+		test_seq 1 10 >somefile &&
+		git add somefile &&
+		mkdir olddir &&
+		>olddir/unrelated-file &&
+		git add olddir &&
+		git commit -m "Unrelated file in recreated old dir"
+	)
+}
+
+#
+# In the following testcase, the first commit on the topic branch renames
+# a directory, while the second recreates the old directory and places a
+# file into it:
+#   Base:     somefile
+#             olddir/a
+#             olddir/b
+#   Upstream: olddir/newfile
+#   Topic_1:  somefile_2
+#             rename olddir/ -> newdir/
+#   Topic_2:  olddir/unrelated-file
+#
+# Note that the first pick should merge:
+#   Base:     somefile
+#             olddir/{a,b}
+#   Upstream: olddir/newfile
+#   Topic_1:  rename olddir/ -> newdir/
+# For which the expected result (assuming merge.directoryRenames=true) is
+# clearly:
+#   Result:   somefile
+#             newdir/{a, b, newfile}
+#
+# While the second pick does the following three-way merge:
+#   Base (Topic_1):           somefile
+#                             newdir/{a,b}
+#   Upstream (Result from 1): same files as base, but adds newdir/newfile
+#   Topic_2:                  same files as base, but adds olddir/unrelated-file
+#
+# The second merge is pretty trivial; upstream adds newdir/newfile, and
+# topic_2 adds olddir/unrelated-file.  We're just testing that we don't
+# accidentally cache directory renames somehow and rename
+# olddir/unrelated-file to newdir/unrelated-file.
+#
+# This testcase should only need one call to diffcore_rename_extended().
+test_expect_success 'caching renames only on upstream side, part 1' '
+	test_setup_topic_rename cache-renames-only-upstream-add-file &&
+	(
+		cd cache-renames-only-upstream-add-file &&
+
+		git switch upstream &&
+
+		>olddir/newfile &&
+		git add olddir/newfile &&
+		git commit -m "Add newfile" &&
+
+		#
+		# Actual testing
+		#
+
+		git switch upstream &&
+
+		git config merge.directoryRenames true &&
+
+		GIT_TRACE2_PERF="$(pwd)/trace.output" &&
+		export GIT_TRACE2_PERF &&
+
+		git replay --onto HEAD upstream~1..topic >out &&
+		git update-ref --stdin <out &&
+		git checkout topic &&
+
+		grep region_enter.*diffcore_rename trace.output >calls &&
+		test_line_count = 1 calls &&
+
+		git ls-files >tracked &&
+		test_line_count = 5 tracked &&
+		test_path_is_missing newdir/unrelated-file &&
+		test_path_is_file olddir/unrelated-file &&
+		test_path_is_file newdir/newfile &&
+		test_path_is_file newdir/b &&
+		test_path_is_file newdir/a &&
+		test_path_is_file somefile
+	)
+'
+
+#
+# The following testcase is *very* similar to the last one, but instead of
+# adding a new olddir/newfile, it renames somefile -> olddir/newfile:
+#   Base:     somefile
+#             olddir/a
+#             olddir/b
+#   Upstream: somefile_1 -> olddir/newfile
+#   Topic_1:  rename olddir/ -> newdir/
+#             somefile_2
+#   Topic_2:  olddir/unrelated-file
+#             somefile_3
+#
+# Much like the previous test, this case is actually trivial and we are just
+# making sure there isn't some spurious directory rename caching going on
+# for the wrong side of history.
+#
+#
+# This testcase should only need two calls to diffcore_rename_extended(),
+# both for the first merge, one for each side of history.
+#
+test_expect_success 'caching renames only on upstream side, part 2' '
+	test_setup_topic_rename cache-renames-only-upstream-rename-file &&
+	(
+		cd cache-renames-only-upstream-rename-file &&
+
+		git switch upstream &&
+
+		git mv somefile olddir/newfile &&
+		git commit -m "Add newfile" &&
+
+		#
+		# Actual testing
+		#
+
+		git switch upstream &&
+
+		git config merge.directoryRenames true &&
+
+		GIT_TRACE2_PERF="$(pwd)/trace.output" &&
+		export GIT_TRACE2_PERF &&
+
+		git replay --onto HEAD upstream~1..topic >out &&
+		git update-ref --stdin <out &&
+		git checkout topic &&
+
+		grep region_enter.*diffcore_rename trace.output >calls &&
+		test_line_count = 2 calls &&
+
+		git ls-files >tracked &&
+		test_line_count = 4 tracked &&
+		test_path_is_missing newdir/unrelated-file &&
+		test_path_is_file olddir/unrelated-file &&
+		test_path_is_file newdir/newfile &&
+		test_path_is_file newdir/b &&
+		test_path_is_file newdir/a
+	)
+'
+
+#
+# The following testcase just creates two simple renames (slightly modified
+# on both sides but without conflicting changes), and a directory full of
+# files that are otherwise uninteresting.  The setup is as follows:
+#
+#   base:     unrelated/<BUNCH OF FILES>
+#             numbers
+#             values
+#   upstream: modify: numbers
+#             modify: values
+#   topic:    add: unrelated/foo
+#             modify: numbers
+#             modify: values
+#             rename: numbers -> sequence
+#             rename: values -> progression
+#
+# This is a trivial rename case, but we're curious what happens with a very
+# low renameLimit interacting with the restart optimization trying to notice
+# that unrelated/ looks like a trivial merge candidate.
+#
+test_expect_success 'avoid assuming we detected renames' '
+	git init redo-weirdness &&
+	(
+		cd redo-weirdness &&
+
+		mkdir unrelated &&
+		for i in $(test_seq 1 10)
+		do
+			>unrelated/$i || exit 1
+		done &&
+		test_seq  2 10 >numbers &&
+		test_seq 12 20 >values &&
+		git add numbers values unrelated/ &&
+		git commit -m orig &&
+
+		git branch upstream &&
+		git branch topic &&
+
+		git switch upstream &&
+		test_seq  1 10 >numbers &&
+		test_seq 11 20 >values &&
+		git add numbers &&
+		git commit -m "Some tweaks" &&
+
+		git switch topic &&
+
+		>unrelated/foo &&
+		test_seq  2 12 >numbers &&
+		test_seq 12 22 >values &&
+		git add numbers values unrelated/ &&
+		git mv numbers sequence &&
+		git mv values progression &&
+		git commit -m A &&
+
+		#
+		# Actual testing
+		#
+
+		git switch --detach topic^0 &&
+
+		test_must_fail git -c merge.renameLimit=1 rebase upstream &&
+
+		git ls-files -u >actual &&
+		test_line_count = 2 actual
+	)
+'
+
+test_done
diff --git a/t/t3030-merge-recursive.sh b/t/t6430-merge-recursive.sh
index d48d211..ca15e6d 100755
--- a/t/t3030-merge-recursive.sh
+++ b/t/t6430-merge-recursive.sh
@@ -2,7 +2,11 @@
 
 test_description='merge-recursive backend test'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-merge.sh
 
 test_expect_success 'setup 1' '
 
@@ -34,7 +38,7 @@ test_expect_success 'setup 1' '
 	git add a d/e &&
 
 	test_tick &&
-	git commit -m "master modifies a and d/e" &&
+	git commit -m "main modifies a and d/e" &&
 	c1=$(git rev-parse --verify HEAD) &&
 	( git ls-tree -r HEAD && git ls-files -s ) >actual &&
 	(
@@ -304,13 +308,13 @@ test_expect_success 'fail if the index has unresolved entries' '
 
 	test_must_fail git merge "$c5" &&
 	test_must_fail git merge "$c5" 2> out &&
-	test_i18ngrep "not possible because you have unmerged files" out &&
+	test_grep "not possible because you have unmerged files" out &&
 	git add -u &&
 	test_must_fail git merge "$c5" 2> out &&
-	test_i18ngrep "You have not concluded your merge" out &&
+	test_grep "You have not concluded your merge" out &&
 	rm -f .git/MERGE_HEAD &&
 	test_must_fail git merge "$c5" 2> out &&
-	test_i18ngrep "Your local changes to the following files would be overwritten by merge:" out
+	test_grep "Your local changes to the following files would be overwritten by merge:" out
 '
 
 test_expect_success 'merge-recursive remove conflict' '
@@ -465,7 +469,7 @@ test_expect_success SYMLINKS 'dir in working tree with symlink ancestor does not
 		git checkout -b branch1 &&
 		git commit --allow-empty -m "empty commit" &&
 
-		git checkout master &&
+		git checkout main &&
 		git rm foo &&
 		mkdir foo &&
 		>foo/bar &&
@@ -474,7 +478,7 @@ test_expect_success SYMLINKS 'dir in working tree with symlink ancestor does not
 
 		git checkout branch1 &&
 
-		git cherry-pick master &&
+		git cherry-pick main &&
 		test_path_is_dir foo &&
 		test_path_is_file foo/bar
 	)
@@ -489,8 +493,8 @@ test_expect_success 'reset and 3-way merge' '
 
 test_expect_success 'reset and bind merge' '
 
-	git reset --hard master &&
-	git read-tree --prefix=M/ master &&
+	git reset --hard main &&
+	git read-tree --prefix=M/ main &&
 	git ls-files -s >actual &&
 	(
 		echo "100644 $o1 0	M/a" &&
@@ -504,7 +508,7 @@ test_expect_success 'reset and bind merge' '
 	) >expected &&
 	test_cmp expected actual &&
 
-	git read-tree --prefix=a1/ master &&
+	git read-tree --prefix=a1/ main &&
 	git ls-files -s >actual &&
 	(
 		echo "100644 $o1 0	M/a" &&
@@ -522,7 +526,7 @@ test_expect_success 'reset and bind merge' '
 	) >expected &&
 	test_cmp expected actual &&
 
-	git read-tree --prefix=z/ master &&
+	git read-tree --prefix=z/ main &&
 	git ls-files -s >actual &&
 	(
 		echo "100644 $o1 0	M/a" &&
@@ -598,11 +602,11 @@ test_expect_success 'merge-recursive w/ empty work tree - theirs has rename' '
 
 test_expect_success 'merge removes empty directories' '
 
-	git reset --hard master &&
+	git reset --hard main &&
 	git checkout -b rm &&
 	git rm d/e &&
 	git commit -mremoved-d/e &&
-	git checkout master &&
+	git checkout main &&
 	git merge -s recursive rm &&
 	test_path_is_missing d
 '
@@ -641,7 +645,7 @@ test_expect_success 'merge-recursive copy vs. rename' '
 	test_cmp expected actual
 '
 
-test_expect_failure 'merge-recursive rename vs. rename/symlink' '
+test_expect_merge_algorithm failure success 'merge-recursive rename vs. rename/symlink' '
 
 	git checkout -f rename &&
 	git merge rename-ln &&
@@ -663,7 +667,7 @@ test_expect_failure 'merge-recursive rename vs. rename/symlink' '
 
 test_expect_success 'merging with triple rename across D/F conflict' '
 	git reset --hard HEAD &&
-	git checkout -b main &&
+	git checkout -b topic &&
 	git rm -rf . &&
 
 	echo "just a file" >sub1 &&
@@ -682,7 +686,7 @@ test_expect_success 'merging with triple rename across D/F conflict' '
 	test_tick &&
 	git commit -a -m changesimplefile &&
 
-	git checkout main &&
+	git checkout topic &&
 	git rm sub1 &&
 	git mv sub2 sub1 &&
 	test_tick &&
@@ -702,19 +706,21 @@ test_expect_success 'merge-recursive remembers the names of all base trees' '
 	# more trees than static slots used by oid_to_hex()
 	for commit in $c0 $c2 $c4 $c5 $c6 $c7
 	do
-		git rev-parse "$commit^{tree}"
+		git rev-parse "$commit^{tree}" || return 1
 	done >trees &&
 
 	# ignore the return code; it only fails because the input is weird...
 	test_must_fail git -c merge.verbosity=5 merge-recursive $(cat trees) -- $c1 $c3 >out &&
 
 	# ...but make sure it fails in the expected way
-	test_i18ngrep CONFLICT.*rename/rename out &&
+	test_grep CONFLICT.*rename/rename out &&
 
 	# merge-recursive prints in reverse order, but we do not care
 	sort <trees >expect &&
 	sed -n "s/^virtual //p" out | sort >actual &&
-	test_cmp expect actual
+	test_cmp expect actual &&
+
+	git clean -fd
 '
 
 test_expect_success 'merge-recursive internal merge resolves to the sameness' '
diff --git a/t/t3031-merge-criscross.sh b/t/t6431-merge-criscross.sh
index 3824756..3fe14cd 100755
--- a/t/t3031-merge-criscross.sh
+++ b/t/t6431-merge-criscross.sh
@@ -2,6 +2,7 @@
 
 test_description='merge-recursive backend test'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 #         A      <- create some files
diff --git a/t/t3032-merge-recursive-space-options.sh b/t/t6432-merge-recursive-space-options.sh
index b56180e..db4b77e 100755
--- a/t/t3032-merge-recursive-space-options.sh
+++ b/t/t6432-merge-recursive-space-options.sh
@@ -2,15 +2,18 @@
 
 test_description='merge-recursive space options
 
-* [master] Clarify
+* [main] Clarify
  ! [remote] Remove cruft
 --
  + [remote] Remove cruft
-*  [master] Clarify
+*  [main] Clarify
 *+ [remote^] Initial revision
 *   ok 1: setup
 '
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 test_have_prereq SED_STRIPS_CR && SED_OPTIONS=-b
@@ -87,7 +90,7 @@ test_expect_success 'setup' '
 	mv text.txt+ text.txt &&
 	git commit -a -m "Remove cruft" &&
 
-	git checkout master &&
+	git checkout main &&
 	sed -e "
 			s/\(not in his right mind\),\(.*\)/\1;\2Q/
 			s/Quite correct\(.*\)/It is too correct\1Q/
diff --git a/t/t3033-merge-toplevel.sh b/t/t6433-merge-toplevel.sh
index e29c284..ed7866d 100755
--- a/t/t3033-merge-toplevel.sh
+++ b/t/t6433-merge-toplevel.sh
@@ -2,10 +2,14 @@
 
 test_description='"git merge" top-level frontend'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 t3033_reset () {
-	git checkout -B master two &&
+	git checkout -B main two &&
 	git branch -f left three &&
 	git branch -f right four
 }
@@ -21,7 +25,7 @@ test_expect_success setup '
 	test_commit four &&
 	git checkout --orphan newroot &&
 	test_commit five &&
-	git checkout master
+	git checkout main
 '
 
 # Local branches
@@ -61,7 +65,7 @@ test_expect_success 'merge octopus, non-fast-forward (ff)' '
 test_expect_success 'merge octopus, fast-forward (does not ff)' '
 	t3033_reset &&
 	git merge left right &&
-	# two (master) is not an ancestor of three (left) and four (right)
+	# two (main) is not an ancestor of three (left) and four (right)
 	test_must_fail git rev-parse --verify HEAD^4 &&
 	git rev-parse HEAD^1 HEAD^2 HEAD^3 | sort >actual &&
 	git rev-parse two three four | sort >expect &&
@@ -118,7 +122,7 @@ test_expect_success 'merge FETCH_HEAD octopus fast-forward (does not ff)' '
 	t3033_reset &&
 	git fetch . left right &&
 	git merge FETCH_HEAD &&
-	# two (master) is not an ancestor of three (left) and four (right)
+	# two (main) is not an ancestor of three (left) and four (right)
 	test_must_fail git rev-parse --verify HEAD^4 &&
 	git rev-parse HEAD^1 HEAD^2 HEAD^3 | sort >actual &&
 	git rev-parse two three four | sort >expect &&
@@ -148,7 +152,7 @@ test_expect_success 'refuse two-project merge by default, quit before --autostas
 	echo change >>one.t &&
 	git diff >expect &&
 	test_must_fail git merge --autostash five 2>err &&
-	test_i18ngrep ! "stash" err &&
+	test_grep ! "stash" err &&
 	git diff >actual &&
 	test_cmp expect actual
 '
@@ -166,7 +170,7 @@ test_expect_success 'two-project merge with --allow-unrelated-histories with --a
 	echo change >>one.t &&
 	git diff one.t >expect &&
 	git merge --allow-unrelated-histories --autostash five 2>err &&
-	test_i18ngrep "Applied autostash." err &&
+	test_grep "Applied autostash." err &&
 	git diff one.t >actual &&
 	test_cmp expect actual
 '
diff --git a/t/t3034-merge-recursive-rename-options.sh b/t/t6434-merge-recursive-rename-options.sh
index 3d9fae6..a117078 100755
--- a/t/t3034-merge-recursive-rename-options.sh
+++ b/t/t6434-merge-recursive-rename-options.sh
@@ -5,11 +5,11 @@ test_description='merge-recursive rename options
 Test rename detection by examining rename/delete conflicts.
 
 * (HEAD -> rename) rename
-| * (master) delete
+| * (main) delete
 |/
 * base
 
-git diff --name-status base master
+git diff --name-status base main
 D	0-old
 D	1-old
 D	2-old
@@ -26,6 +26,9 @@ they are rounded down (see, e.g., Documentation/diff-generate-patch.txt, which
 mentions this in a different context).
 '
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 get_expected_stages () {
@@ -118,7 +121,7 @@ test_expect_success 'setup repo' '
 	get_expected_stages 2 &&
 	get_expected_stages 3 &&
 	check_50="false" &&
-	tail="HEAD^ -- HEAD master"
+	tail="HEAD^ -- HEAD main"
 '
 
 test_expect_success 'setup thresholds' '
diff --git a/t/t3035-merge-sparse.sh b/t/t6435-merge-sparse.sh
index 74562e1..78628fb 100755
--- a/t/t3035-merge-sparse.sh
+++ b/t/t6435-merge-sparse.sh
@@ -2,6 +2,8 @@
 
 test_description='merge with sparse files'
 
+TEST_CREATE_REPO_NO_TEMPLATE=1
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # test_file $filename $content
@@ -26,6 +28,7 @@ test_expect_success 'setup' '
 	git rm modify_delete &&
 	test_commit_this ours &&
 	git config core.sparseCheckout true &&
+	mkdir .git/info &&
 	echo "/checked-out" >.git/info/sparse-checkout &&
 	git reset --hard &&
 	test_must_fail git merge theirs
diff --git a/t/t7607-merge-overwrite.sh b/t/t6436-merge-overwrite.sh
index dd8ab7e..4f43764 100755
--- a/t/t7607-merge-overwrite.sh
+++ b/t/t6436-merge-overwrite.sh
@@ -4,6 +4,9 @@ test_description='git-merge
 
 Do not overwrite changes.'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -65,7 +68,8 @@ test_expect_success 'will not overwrite removed file' '
 	git commit -m "rm c1.c" &&
 	cp important c1.c &&
 	test_must_fail git merge c1a &&
-	test_cmp important c1.c
+	test_cmp important c1.c &&
+	rm c1.c  # Do not leave untracked file in way of future tests
 '
 
 test_expect_success 'will not overwrite re-added file' '
@@ -97,11 +101,19 @@ test_expect_success 'will not overwrite unstaged changes in renamed file' '
 	git mv c1.c other.c &&
 	git commit -m rename &&
 	cp important other.c &&
-	test_must_fail git merge c1a >out &&
-	test_i18ngrep "Refusing to lose dirty file at other.c" out &&
-	test_path_is_file other.c~HEAD &&
-	test $(git hash-object other.c~HEAD) = $(git rev-parse c1a:c1.c) &&
-	test_cmp important other.c
+	if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+	then
+		test_must_fail git merge c1a >out 2>err &&
+		test_grep "would be overwritten by merge" err &&
+		test_cmp important other.c &&
+		test_path_is_missing .git/MERGE_HEAD
+	else
+		test_must_fail git merge c1a >out &&
+		test_grep "Refusing to lose dirty file at other.c" out &&
+		test_path_is_file other.c~HEAD &&
+		test $(git hash-object other.c~HEAD) = $(git rev-parse c1a:c1.c) &&
+		test_cmp important other.c
+	fi
 '
 
 test_expect_success 'will not overwrite untracked subtree' '
@@ -128,7 +140,7 @@ test_expect_success 'will not overwrite untracked file in leading path' '
 	cp important sub &&
 	cp important sub2 &&
 	test_must_fail git merge sub 2>out &&
-	test_i18ncmp out expect &&
+	test_cmp out expect &&
 	test_path_is_missing .git/MERGE_HEAD &&
 	test_cmp important sub &&
 	test_cmp important sub2 &&
@@ -163,7 +175,7 @@ test_expect_success 'will not overwrite untracked file on unborn branch' '
 	git checkout --orphan new &&
 	cp important c0.c &&
 	test_must_fail git merge c0 2>out &&
-	test_i18ncmp out expect
+	test_cmp out expect
 '
 
 test_expect_success 'will not overwrite untracked file on unborn branch .git/MERGE_HEAD sanity etc.' '
@@ -185,7 +197,7 @@ test_expect_success 'set up unborn branch and content' '
 '
 
 test_expect_success 'will not clobber WT/index when merging into unborn' '
-	git merge master &&
+	git merge main &&
 	grep foo tracked-file &&
 	git show :tracked-file >expect &&
 	grep foo expect &&
diff --git a/t/t7405-submodule-merge.sh b/t/t6437-submodule-merge.sh
index 6a1e5f8..7a3f1cb 100755
--- a/t/t7405-submodule-merge.sh
+++ b/t/t6437-submodule-merge.sh
@@ -2,7 +2,15 @@
 
 test_description='merging with submodules'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+GIT_TEST_FATAL_REGISTER_SUBMODULE_ODB=1
+export GIT_TEST_FATAL_REGISTER_SUBMODULE_ODB
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-merge.sh
 
 #
 # history
@@ -27,7 +35,7 @@ test_expect_success setup '
 	test_tick &&
 	git commit -m root &&
 
-	git checkout -b a master &&
+	git checkout -b a main &&
 	(cd sub &&
 	 echo A > file &&
 	 git add file &&
@@ -37,7 +45,7 @@ test_expect_success setup '
 	test_tick &&
 	git commit -m a &&
 
-	git checkout -b b master &&
+	git checkout -b b main &&
 	(cd sub &&
 	 echo B > file &&
 	 git add file &&
@@ -96,8 +104,25 @@ test_expect_success 'setup for merge search' '
 	 echo "file-c" > file-c &&
 	 git add file-c &&
 	 git commit -m "sub-c") &&
-	git commit -a -m "c" &&
+	git commit -a -m "c")
+'
+
+test_expect_success 'merging should conflict for non fast-forward' '
+	test_when_finished "git -C merge-search reset --hard" &&
+	(cd merge-search &&
+	 git checkout -b test-nonforward-a b &&
+	  if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+	  then
+		test_must_fail git merge c 2>actual &&
+		sub_expect="go to submodule (sub), and either merge commit $(git -C sub rev-parse --short sub-c)" &&
+		grep "$sub_expect" actual
+	  else
+		test_must_fail git merge c 2> actual
+	  fi)
+'
 
+test_expect_success 'finish setup for merge-search' '
+	(cd merge-search &&
 	git checkout -b d a &&
 	(cd sub &&
 	 git checkout -b sub-d sub-b &&
@@ -122,12 +147,19 @@ test_expect_success 'merge with one side as a fast-forward of the other' '
 	 test_cmp expect actual)
 '
 
-test_expect_success 'merging should conflict for non fast-forward' '
+test_expect_success 'merging should conflict for non fast-forward (resolution exists)' '
 	(cd merge-search &&
-	 git checkout -b test-nonforward b &&
+	 git checkout -b test-nonforward-b b &&
 	 (cd sub &&
-	  git rev-parse sub-d > ../expect) &&
-	 test_must_fail git merge c 2> actual  &&
+	  git rev-parse --short sub-d > ../expect) &&
+	  if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+	  then
+		test_must_fail git merge c >actual 2>sub-actual &&
+		sub_expect="go to submodule (sub), and either merge commit $(git -C sub rev-parse --short sub-c)" &&
+		grep "$sub_expect" sub-actual
+	  else
+		test_must_fail git merge c 2> actual
+	  fi &&
 	 grep $(cat expect) actual > /dev/null &&
 	 git reset --hard)
 '
@@ -138,9 +170,23 @@ test_expect_success 'merging should fail for ambiguous common parent' '
 	(cd sub &&
 	 git checkout -b ambiguous sub-b &&
 	 git merge sub-c &&
-	 git rev-parse sub-d > ../expect1 &&
-	 git rev-parse ambiguous > ../expect2) &&
-	test_must_fail git merge c 2> actual &&
+	 if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+	 then
+		git rev-parse --short sub-d >../expect1 &&
+		git rev-parse --short ambiguous >../expect2
+	 else
+		git rev-parse sub-d > ../expect1 &&
+		git rev-parse ambiguous > ../expect2
+	 fi
+	 ) &&
+	 if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+	 then
+		test_must_fail git merge c >actual 2>sub-actual &&
+		sub_expect="go to submodule (sub), and either merge commit $(git -C sub rev-parse --short sub-c)" &&
+		grep "$sub_expect" sub-actual
+	 else
+		test_must_fail git merge c 2> actual
+	 fi &&
 	grep $(cat expect1) actual > /dev/null &&
 	grep $(cat expect2) actual > /dev/null &&
 	git reset --hard)
@@ -181,7 +227,12 @@ test_expect_success 'merging should fail for changes that are backwards' '
 	git commit -a -m "f" &&
 
 	git checkout -b test-backward e &&
-	test_must_fail git merge f)
+	test_must_fail git merge f 2>actual &&
+	if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+    then
+		sub_expect="go to submodule (sub), and either merge commit $(git -C sub rev-parse --short sub-d)" &&
+		grep "$sub_expect" actual
+	fi)
 '
 
 
@@ -237,22 +288,22 @@ test_expect_success 'setup for recursive merge with submodule' '
 	 (cd sub &&
 	  git init &&
 	  test_commit a &&
-	  git checkout -b sub-b master &&
+	  git checkout -b sub-b main &&
 	  test_commit b &&
-	  git checkout -b sub-c master &&
+	  git checkout -b sub-c main &&
 	  test_commit c &&
 	  git checkout -b sub-bc sub-b &&
 	  git merge sub-c &&
 	  git checkout -b sub-cb sub-c &&
 	  git merge sub-b &&
-	  git checkout master) &&
+	  git checkout main) &&
 	 git add sub &&
 	 git commit -m a &&
-	 git checkout -b top-b master &&
+	 git checkout -b top-b main &&
 	 (cd sub && git checkout sub-b) &&
 	 git add sub &&
 	 git commit -m b &&
-	 git checkout -b top-c master &&
+	 git checkout -b top-c main &&
 	 (cd sub && git checkout sub-c) &&
 	 git add sub &&
 	 git commit -m c &&
@@ -286,7 +337,7 @@ test_expect_success 'recursive merge with submodule' '
 #   Expected: path/ is submodule and file contents for B's path are somewhere
 
 test_expect_success 'setup file/submodule conflict' '
-	test_create_repo file-submodule &&
+	git init file-submodule &&
 	(
 		cd file-submodule &&
 
@@ -301,14 +352,14 @@ test_expect_success 'setup file/submodule conflict' '
 		git commit -m B &&
 
 		git checkout A &&
-		test_create_repo path &&
+		git init path &&
 		test_commit -C path world &&
 		git submodule add ./path &&
 		git commit -m A
 	)
 '
 
-test_expect_failure 'file/submodule conflict' '
+test_expect_merge_algorithm failure success 'file/submodule conflict' '
 	test_when_finished "git -C file-submodule reset --hard" &&
 	(
 		cd file-submodule &&
@@ -361,7 +412,7 @@ test_expect_success 'file/submodule conflict; merge --abort works afterward' '
 #     under the submodule to be treated as untracked or in the way.
 
 test_expect_success 'setup directory/submodule conflict' '
-	test_create_repo directory-submodule &&
+	git init directory-submodule &&
 	(
 		cd directory-submodule &&
 
@@ -384,7 +435,7 @@ test_expect_success 'setup directory/submodule conflict' '
 		git commit -m B2 &&
 
 		git checkout A &&
-		test_create_repo path &&
+		git init path &&
 		test_commit -C path hello world &&
 		git submodule add ./path &&
 		git commit -m A
@@ -417,7 +468,7 @@ test_expect_failure 'directory/submodule conflict; keep submodule clean' '
 	)
 '
 
-test_expect_failure !FAIL_PREREQS 'directory/submodule conflict; should not treat submodule files as untracked or in the way' '
+test_expect_merge_algorithm failure success !FAIL_PREREQS 'directory/submodule conflict; should not treat submodule files as untracked or in the way' '
 	test_when_finished "git -C directory-submodule/path reset --hard" &&
 	test_when_finished "git -C directory-submodule reset --hard" &&
 	(
@@ -429,7 +480,7 @@ test_expect_failure !FAIL_PREREQS 'directory/submodule conflict; should not trea
 		# We do not want files within the submodule to prevent the
 		# merge from starting; we should not be writing to such paths
 		# anyway.
-		test_i18ngrep ! "refusing to lose untracked file at" err
+		test_grep ! "refusing to lose untracked file at" err
 	)
 '
 
@@ -452,4 +503,44 @@ test_expect_failure 'directory/submodule conflict; merge --abort works afterward
 	)
 '
 
+# Setup:
+#   - Submodule has 2 commits: a and b
+#   - Superproject branch 'a' adds and commits submodule pointing to 'commit a'
+#   - Superproject branch 'b' adds and commits submodule pointing to 'commit b'
+# If these two branches are now merged, there is no merge base
+test_expect_success 'setup for null merge base' '
+	mkdir no-merge-base &&
+	(cd no-merge-base &&
+	git init &&
+	mkdir sub &&
+	(cd sub &&
+	 git init &&
+	 echo "file-a" > file-a &&
+	 git add file-a &&
+	 git commit -m "commit a") &&
+	git commit --allow-empty -m init &&
+	git branch init &&
+	git checkout -b a init &&
+	git add sub &&
+	git commit -m "a" &&
+	git switch main &&
+	(cd sub &&
+	 echo "file-b" > file-b &&
+	 git add file-b &&
+	 git commit -m "commit b"))
+'
+
+test_expect_success 'merging should fail with no merge base' '
+	(cd no-merge-base &&
+	git checkout -b b init &&
+	git add sub &&
+	git commit -m "b" &&
+	test_must_fail git merge a 2>actual &&
+	if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+    then
+		sub_expect="go to submodule (sub), and either merge commit $(git -C sub rev-parse --short HEAD^1)" &&
+		grep "$sub_expect" actual
+	fi)
+'
+
 test_done
diff --git a/t/t7613-merge-submodule.sh b/t/t6438-submodule-directory-file-conflicts.sh
index 04bf4be..8df67a0 100755
--- a/t/t7613-merge-submodule.sh
+++ b/t/t6438-submodule-directory-file-conflicts.sh
@@ -12,8 +12,11 @@ test_submodule_switch "merge --ff"
 
 test_submodule_switch "merge --ff-only"
 
-KNOWN_FAILURE_NOFF_MERGE_DOESNT_CREATE_EMPTY_SUBMODULE_DIR=1
-KNOWN_FAILURE_NOFF_MERGE_ATTEMPTS_TO_MERGE_REMOVED_SUBMODULE_FILES=1
+if test "$GIT_TEST_MERGE_ALGORITHM" != ort
+then
+	KNOWN_FAILURE_NOFF_MERGE_DOESNT_CREATE_EMPTY_SUBMODULE_DIR=1
+	KNOWN_FAILURE_NOFF_MERGE_ATTEMPTS_TO_MERGE_REMOVED_SUBMODULE_FILES=1
+fi
 test_submodule_switch "merge --no-ff"
 
 test_done
diff --git a/t/t7609-merge-co-error-msgs.sh b/t/t6439-merge-co-error-msgs.sh
index 5c8894d..0cbec57 100755
--- a/t/t7609-merge-co-error-msgs.sh
+++ b/t/t6439-merge-co-error-msgs.sh
@@ -2,6 +2,10 @@
 
 test_description='unpack-trees error messages'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 
@@ -18,7 +22,7 @@ test_expect_success 'setup' '
 	git add two three four five &&
 	git commit -m Second &&
 
-	git checkout master &&
+	git checkout main &&
 	echo other >two &&
 	echo other >three &&
 	echo other >four &&
@@ -37,14 +41,15 @@ EOF
 
 test_expect_success 'untracked files overwritten by merge (fast and non-fast forward)' '
 	test_must_fail git merge branch 2>out &&
-	test_i18ncmp out expect &&
+	test_cmp out expect &&
 	git commit --allow-empty -m empty &&
 	(
 		GIT_MERGE_VERBOSITY=0 &&
 		export GIT_MERGE_VERBOSITY &&
 		test_must_fail git merge branch 2>out2
 	) &&
-	test_i18ncmp out2 expect &&
+	echo "Merge with strategy ${GIT_TEST_MERGE_ALGORITHM:-ort} failed." >>expect &&
+	test_cmp out2 expect &&
 	git reset --hard HEAD^
 '
 
@@ -65,7 +70,7 @@ test_expect_success 'untracked files or local changes ovewritten by merge' '
 	git add three &&
 	git add four &&
 	test_must_fail git merge branch 2>out &&
-	test_i18ncmp out expect
+	test_cmp out expect
 '
 
 cat >expect <<\EOF
@@ -83,11 +88,11 @@ test_expect_success 'cannot switch branches because of local changes' '
 	echo two >rep/two &&
 	git add rep/one rep/two &&
 	git commit -m Fourth &&
-	git checkout master &&
+	git checkout main &&
 	echo uno >rep/one &&
 	echo dos >rep/two &&
 	test_must_fail git checkout branch 2>out &&
-	test_i18ncmp out expect
+	test_cmp out expect
 '
 
 cat >expect <<\EOF
@@ -101,7 +106,7 @@ EOF
 test_expect_success 'not uptodate file porcelain checkout error' '
 	git add rep/one rep/two &&
 	test_must_fail git checkout branch 2>out &&
-	test_i18ncmp out expect
+	test_cmp out expect
 '
 
 cat >expect <<\EOF
@@ -128,11 +133,11 @@ test_expect_success 'not_uptodate_dir porcelain checkout error' '
 	>rep2 &&
 	git add rep rep2 &&
 	git commit -m "added test as a file" &&
-	git checkout master &&
+	git checkout main &&
 	>rep/untracked-file &&
 	>rep2/untracked-file &&
 	test_must_fail git checkout branch 2>out &&
-	test_i18ncmp out ../expect
+	test_cmp out ../expect
 '
 
 test_done
diff --git a/t/t6500-gc.sh b/t/t6500-gc.sh
index 4a3b8f4..43d4017 100755
--- a/t/t6500-gc.sh
+++ b/t/t6500-gc.sh
@@ -11,23 +11,7 @@ test_expect_success 'setup' '
 	# behavior, make sure we always pack everything to one pack by
 	# default
 	git config gc.bigPackThreshold 2g &&
-
-	# These are simply values which, when hashed as a blob with a newline,
-	# produce a hash where the first byte is 0x17 in their respective
-	# algorithms.
-	test_oid_cache <<-EOF
-	obj1 sha1:263
-	obj1 sha256:34
-
-	obj2 sha1:410
-	obj2 sha256:174
-
-	obj3 sha1:523
-	obj3 sha256:313
-
-	obj4 sha1:790
-	obj4 sha256:481
-	EOF
+	test_oid_init
 '
 
 test_expect_success 'gc empty repository' '
@@ -41,7 +25,7 @@ test_expect_success 'gc does not leave behind pid file' '
 
 test_expect_success 'gc --gobbledegook' '
 	test_expect_code 129 git gc --nonsense 2>err &&
-	test_i18ngrep "[Uu]sage: git gc" err
+	test_grep "[Uu]sage: git gc" err
 '
 
 test_expect_success 'gc -h with invalid configuration' '
@@ -52,7 +36,7 @@ test_expect_success 'gc -h with invalid configuration' '
 		echo "[gc] pruneexpire = CORRUPT" >>.git/config &&
 		test_expect_code 129 git gc -h >usage 2>&1
 	) &&
-	test_i18ngrep "[Uu]sage" broken/usage
+	test_grep "[Uu]sage" broken/usage
 '
 
 test_expect_success 'gc is not aborted due to a stale symref' '
@@ -78,7 +62,7 @@ test_expect_success 'gc --keep-largest-pack' '
 		git gc &&
 		( cd .git/objects/pack && ls *.pack ) >pack-list &&
 		test_line_count = 1 pack-list &&
-		BASE_PACK=.git/objects/pack/pack-*.pack &&
+		cp pack-list base-pack-list &&
 		test_commit four &&
 		git repack -d &&
 		test_commit five &&
@@ -90,11 +74,55 @@ test_expect_success 'gc --keep-largest-pack' '
 		test_line_count = 2 pack-list &&
 		awk "/^P /{print \$2}" <.git/objects/info/packs >pack-info &&
 		test_line_count = 2 pack-info &&
-		test_path_is_file $BASE_PACK &&
+		test_path_is_file .git/objects/pack/$(cat base-pack-list) &&
 		git fsck
 	)
 '
 
+test_expect_success 'pre-auto-gc hook can stop auto gc' '
+	cat >err.expect <<-\EOF &&
+	no gc for you
+	EOF
+
+	git init pre-auto-gc-hook &&
+	test_hook -C pre-auto-gc-hook pre-auto-gc <<-\EOF &&
+	echo >&2 no gc for you &&
+	exit 1
+	EOF
+	(
+		cd pre-auto-gc-hook &&
+
+		git config gc.auto 3 &&
+		git config gc.autoDetach false &&
+
+		# We need to create two object whose sha1s start with 17
+		# since this is what git gc counts.  As it happens, these
+		# two blobs will do so.
+		test_commit "$(test_oid blob17_1)" &&
+		test_commit "$(test_oid blob17_2)" &&
+
+		git gc --auto >../out.actual 2>../err.actual
+	) &&
+	test_must_be_empty out.actual &&
+	test_cmp err.expect err.actual &&
+
+	cat >err.expect <<-\EOF &&
+	will gc for you
+	Auto packing the repository for optimum performance.
+	See "git help gc" for manual housekeeping.
+	EOF
+
+	test_hook -C pre-auto-gc-hook --clobber pre-auto-gc <<-\EOF &&
+	echo >&2 will gc for you &&
+	exit 0
+	EOF
+
+	git -C pre-auto-gc-hook gc --auto >out.actual 2>err.actual &&
+
+	test_must_be_empty out.actual &&
+	test_cmp err.expect err.actual
+'
+
 test_expect_success 'auto gc with too many loose objects does not attempt to create bitmaps' '
 	test_config gc.auto 3 &&
 	test_config gc.autodetach false &&
@@ -102,35 +130,35 @@ test_expect_success 'auto gc with too many loose objects does not attempt to cre
 	# We need to create two object whose sha1s start with 17
 	# since this is what git gc counts.  As it happens, these
 	# two blobs will do so.
-	test_commit "$(test_oid obj1)" &&
-	test_commit "$(test_oid obj2)" &&
+	test_commit "$(test_oid blob17_1)" &&
+	test_commit "$(test_oid blob17_2)" &&
 	# Our first gc will create a pack; our second will create a second pack
 	git gc --auto &&
-	ls .git/objects/pack | sort >existing_packs &&
-	test_commit "$(test_oid obj3)" &&
-	test_commit "$(test_oid obj4)" &&
+	ls .git/objects/pack/pack-*.pack | sort >existing_packs &&
+	test_commit "$(test_oid blob17_3)" &&
+	test_commit "$(test_oid blob17_4)" &&
 
 	git gc --auto 2>err &&
-	test_i18ngrep ! "^warning:" err &&
-	ls .git/objects/pack/ | sort >post_packs &&
+	test_grep ! "^warning:" err &&
+	ls .git/objects/pack/pack-*.pack | sort >post_packs &&
 	comm -1 -3 existing_packs post_packs >new &&
 	comm -2 -3 existing_packs post_packs >del &&
 	test_line_count = 0 del && # No packs are deleted
-	test_line_count = 2 new # There is one new pack and its .idx
+	test_line_count = 1 new # There is one new pack
 '
 
 test_expect_success 'gc --no-quiet' '
 	GIT_PROGRESS_DELAY=0 git -c gc.writeCommitGraph=true gc --no-quiet >stdout 2>stderr &&
 	test_must_be_empty stdout &&
-	test_i18ngrep "Computing commit graph generation numbers" stderr
+	test_grep "Computing commit graph generation numbers" stderr
 '
 
 test_expect_success TTY 'with TTY: gc --no-quiet' '
 	test_terminal env GIT_PROGRESS_DELAY=0 \
 		git -c gc.writeCommitGraph=true gc --no-quiet >stdout 2>stderr &&
 	test_must_be_empty stdout &&
-	test_i18ngrep "Enumerating objects" stderr &&
-	test_i18ngrep "Computing commit graph generation numbers" stderr
+	test_grep "Enumerating objects" stderr &&
+	test_grep "Computing commit graph generation numbers" stderr
 '
 
 test_expect_success 'gc --quiet' '
@@ -158,6 +186,158 @@ test_expect_success 'one of gc.reflogExpire{Unreachable,}=never does not skip "e
 	grep -E "^trace: (built-in|exec|run_command): git reflog expire --" trace.out
 '
 
+test_expect_success 'gc.repackFilter launches repack with a filter' '
+	git clone --no-local --bare . bare.git &&
+
+	git -C bare.git -c gc.cruftPacks=false gc &&
+	test_stdout_line_count = 1 ls bare.git/objects/pack/*.pack &&
+
+	GIT_TRACE=$(pwd)/trace.out git -C bare.git -c gc.repackFilter=blob:none \
+		-c repack.writeBitmaps=false -c gc.cruftPacks=false gc &&
+	test_stdout_line_count = 2 ls bare.git/objects/pack/*.pack &&
+	grep -E "^trace: (built-in|exec|run_command): git repack .* --filter=blob:none ?.*" trace.out
+'
+
+test_expect_success 'gc.repackFilterTo store filtered out objects' '
+	test_when_finished "rm -rf bare.git filtered.git" &&
+
+	git init --bare filtered.git &&
+	git -C bare.git -c gc.repackFilter=blob:none \
+		-c gc.repackFilterTo=../filtered.git/objects/pack/pack \
+		-c repack.writeBitmaps=false -c gc.cruftPacks=false gc &&
+
+	test_stdout_line_count = 1 ls bare.git/objects/pack/*.pack &&
+	test_stdout_line_count = 1 ls filtered.git/objects/pack/*.pack
+'
+
+prepare_cruft_history () {
+	test_commit base &&
+
+	test_commit --no-tag foo &&
+	test_commit --no-tag bar &&
+	git reset HEAD^^
+}
+
+assert_no_cruft_packs () {
+	find .git/objects/pack -name "*.mtimes" >mtimes &&
+	test_must_be_empty mtimes
+}
+
+for argv in \
+	"gc" \
+	"-c gc.cruftPacks=true gc" \
+	"-c gc.cruftPacks=false gc --cruft"
+do
+	test_expect_success "git $argv generates a cruft pack" '
+		test_when_finished "rm -fr repo" &&
+		git init repo &&
+		(
+			cd repo &&
+
+			prepare_cruft_history &&
+			git $argv &&
+
+			find .git/objects/pack -name "*.mtimes" >mtimes &&
+			sed -e 's/\.mtimes$/\.pack/g' mtimes >packs &&
+
+			test_file_not_empty packs &&
+			while read pack
+			do
+				test_path_is_file "$pack" || return 1
+			done <packs
+		)
+	'
+done
+
+for argv in \
+	"gc --no-cruft" \
+	"-c gc.cruftPacks=false gc" \
+	"-c gc.cruftPacks=true gc --no-cruft"
+do
+	test_expect_success "git $argv does not generate a cruft pack" '
+		test_when_finished "rm -fr repo" &&
+		git init repo &&
+		(
+			cd repo &&
+
+			prepare_cruft_history &&
+			git $argv &&
+
+			assert_no_cruft_packs
+		)
+	'
+done
+
+test_expect_success '--keep-largest-pack ignores cruft packs' '
+	test_when_finished "rm -fr repo" &&
+	git init repo &&
+	(
+		cd repo &&
+
+		# Generate a pack for reachable objects (of which there
+		# are 3), and one for unreachable objects (of which
+		# there are 6).
+		prepare_cruft_history &&
+		git gc --cruft &&
+
+		mtimes="$(find .git/objects/pack -type f -name "pack-*.mtimes")" &&
+		sz="$(test_file_size "${mtimes%.mtimes}.pack")" &&
+
+		# Ensure that the cruft pack gets removed (due to
+		# `--prune=now`) despite it being the largest pack.
+		git -c gc.bigPackThreshold=$sz gc --cruft --prune=now &&
+
+		assert_no_cruft_packs
+	)
+'
+
+test_expect_success 'gc.bigPackThreshold ignores cruft packs' '
+	test_when_finished "rm -fr repo" &&
+	git init repo &&
+	(
+		cd repo &&
+
+		# Generate a pack for reachable objects (of which there
+		# are 3), and one for unreachable objects (of which
+		# there are 6).
+		prepare_cruft_history &&
+		git gc --cruft &&
+
+		# Ensure that the cruft pack gets removed (due to
+		# `--prune=now`) despite it being the largest pack.
+		git gc --cruft --prune=now --keep-largest-pack &&
+
+		assert_no_cruft_packs
+	)
+'
+
+cruft_max_size_opts="git repack -d -l --cruft --cruft-expiration=2.weeks.ago"
+
+test_expect_success 'setup for --max-cruft-size tests' '
+	git init cruft--max-size &&
+	(
+		cd cruft--max-size &&
+		prepare_cruft_history
+	)
+'
+
+test_expect_success '--max-cruft-size sets appropriate repack options' '
+	GIT_TRACE2_EVENT=$(pwd)/trace2.txt git -C cruft--max-size \
+		gc --cruft --max-cruft-size=1M &&
+	test_subcommand $cruft_max_size_opts --max-cruft-size=1048576 <trace2.txt
+'
+
+test_expect_success 'gc.maxCruftSize sets appropriate repack options' '
+	GIT_TRACE2_EVENT=$(pwd)/trace2.txt \
+		git -C cruft--max-size -c gc.maxCruftSize=2M gc --cruft &&
+	test_subcommand $cruft_max_size_opts --max-cruft-size=2097152 <trace2.txt &&
+
+	GIT_TRACE2_EVENT=$(pwd)/trace2.txt \
+		git -C cruft--max-size -c gc.maxCruftSize=2M gc --cruft \
+		--max-cruft-size=3M &&
+	test_subcommand $cruft_max_size_opts --max-cruft-size=3145728 <trace2.txt
+'
+
 run_and_wait_for_auto_gc () {
 	# We read stdout from gc for the side effect of waiting until the
 	# background gc process exits, closing its fd 9.  Furthermore, the
@@ -176,7 +356,7 @@ test_expect_success 'background auto gc does not run if gc.log is present and re
 	test_config gc.autodetach true &&
 	echo fleem >.git/gc.log &&
 	git gc --auto 2>err &&
-	test_i18ngrep "^warning:" err &&
+	test_grep "^warning:" err &&
 	test_config gc.logexpiry 5.days &&
 	test-tool chmtime =-345600 .git/gc.log &&
 	git gc --auto &&
@@ -195,7 +375,7 @@ test_expect_success 'background auto gc respects lock for all operations' '
 
 	# create a ref whose loose presence we can use to detect a pack-refs run
 	git update-ref refs/heads/should-be-loose HEAD &&
-	test_path_is_file .git/refs/heads/should-be-loose &&
+	(ls -1 .git/refs/heads .git/reftable >expect || true) &&
 
 	# now fake a concurrent gc that holds the lock; we can use our
 	# shell pid so that it looks valid.
@@ -212,7 +392,8 @@ test_expect_success 'background auto gc respects lock for all operations' '
 
 	# our gc should exit zero without doing anything
 	run_and_wait_for_auto_gc &&
-	test_path_is_file .git/refs/heads/should-be-loose
+	(ls -1 .git/refs/heads .git/reftable >actual || true) &&
+	test_cmp expect actual
 '
 
 # DO NOT leave a detached auto gc process running near the end of the
diff --git a/t/t6501-freshen-objects.sh b/t/t6501-freshen-objects.sh
index 8a3bb41..4521508 100755
--- a/t/t6501-freshen-objects.sh
+++ b/t/t6501-freshen-objects.sh
@@ -25,6 +25,10 @@
 #      to refer to an existing tree).
 
 test_description='check pruning of dependent objects'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # We care about reachability, so we do not want to use
@@ -40,15 +44,25 @@ commit () {
 }
 
 maybe_repack () {
-	if test -n "$repack"; then
+	case "$title" in
+	loose)
+		: skip repack
+		;;
+	repack)
 		git repack -ad
-	fi
+		;;
+	bitmap)
+		git repack -adb
+		;;
+	*)
+		echo >&2 "unknown test type in maybe_repack"
+		return 1
+		;;
+	esac
 }
 
-for repack in '' true; do
-	title=${repack:+repack}
-	title=${title:-loose}
-
+for title in loose repack bitmap
+do
 	test_expect_success "make repo completely empty ($title)" '
 		rm -rf .git &&
 		git init
@@ -67,7 +81,7 @@ for repack in '' true; do
 		git checkout -b experiment &&
 		commit abandon &&
 		maybe_repack &&
-		git checkout master &&
+		git checkout main &&
 		git branch -D experiment
 	'
 
@@ -87,7 +101,7 @@ for repack in '' true; do
 	'
 
 	test_expect_success "simultaneous gc ($title)" '
-		git gc --prune=12.hours.ago
+		git gc --no-cruft --prune=12.hours.ago
 	'
 
 	test_expect_success "finish writing out commit ($title)" '
@@ -117,7 +131,7 @@ for repack in '' true; do
 	'
 
 	test_expect_success "simultaneous gc ($title)" '
-		git gc --prune=12.hours.ago
+		git gc --no-cruft --prune=12.hours.ago
 	'
 
 	# tree should have been refreshed by write-tree
@@ -137,8 +151,8 @@ test_expect_success 'do not complain about existing broken links (commit)' '
 	some message
 	EOF
 	commit=$(git hash-object -t commit -w broken-commit) &&
-	git gc -q 2>stderr &&
-	verbose git cat-file -e $commit &&
+	git gc --no-cruft -q 2>stderr &&
+	git cat-file -e $commit &&
 	test_must_be_empty stderr
 '
 
@@ -147,7 +161,7 @@ test_expect_success 'do not complain about existing broken links (tree)' '
 	100644 blob $(test_oid 003)	foo
 	EOF
 	tree=$(git mktree --missing <broken-tree) &&
-	git gc -q 2>stderr &&
+	git gc --no-cruft -q 2>stderr &&
 	git cat-file -e $tree &&
 	test_must_be_empty stderr
 '
@@ -162,7 +176,7 @@ test_expect_success 'do not complain about existing broken links (tag)' '
 	this is a broken tag
 	EOF
 	tag=$(git hash-object -t tag -w broken-tag) &&
-	git gc -q 2>stderr &&
+	git gc --no-cruft -q 2>stderr &&
 	git cat-file -e $tag &&
 	test_must_be_empty stderr
 '
diff --git a/t/t6600-test-reach.sh b/t/t6600-test-reach.sh
index 475564b..b330945 100755
--- a/t/t6600-test-reach.sh
+++ b/t/t6600-test-reach.sh
@@ -32,7 +32,7 @@ test_expect_success 'setup' '
 	do
 		test_commit "1-$i" &&
 		git branch -f commit-1-$i &&
-		git tag -a -m "1-$i" tag-1-$i commit-1-$i
+		git tag -a -m "1-$i" tag-1-$i commit-1-$i || return 1
 	done &&
 	for j in $(test_seq 1 9)
 	do
@@ -46,7 +46,7 @@ test_expect_success 'setup' '
 		do
 			git merge commit-$j-$i -m "$x-$i" &&
 			git branch -f commit-$x-$i &&
-			git tag -a -m "$x-$i" tag-$x-$i commit-$x-$i
+			git tag -a -m "$x-$i" tag-$x-$i commit-$x-$i || return 1
 		done
 	done &&
 	git commit-graph write --reachable &&
@@ -55,10 +55,13 @@ test_expect_success 'setup' '
 	git show-ref -s commit-5-5 | git commit-graph write --stdin-commits &&
 	mv .git/objects/info/commit-graph commit-graph-half &&
 	chmod u+w commit-graph-half &&
+	git -c commitGraph.generationVersion=1 commit-graph write --reachable &&
+	mv .git/objects/info/commit-graph commit-graph-no-gdat &&
+	chmod u+w commit-graph-no-gdat &&
 	git config core.commitGraph true
 '
 
-run_three_modes () {
+run_all_modes () {
 	test_when_finished rm -rf .git/objects/info/commit-graph &&
 	"$@" <input >actual &&
 	test_cmp expect actual &&
@@ -67,11 +70,14 @@ run_three_modes () {
 	test_cmp expect actual &&
 	cp commit-graph-half .git/objects/info/commit-graph &&
 	"$@" <input >actual &&
+	test_cmp expect actual &&
+	cp commit-graph-no-gdat .git/objects/info/commit-graph &&
+	"$@" <input >actual &&
 	test_cmp expect actual
 }
 
-test_three_modes () {
-	run_three_modes test-tool reach "$@"
+test_all_modes () {
+	run_all_modes test-tool reach "$@"
 }
 
 test_expect_success 'ref_newer:miss' '
@@ -80,7 +86,7 @@ test_expect_success 'ref_newer:miss' '
 	B:commit-4-9
 	EOF
 	echo "ref_newer(A,B):0" >expect &&
-	test_three_modes ref_newer
+	test_all_modes ref_newer
 '
 
 test_expect_success 'ref_newer:hit' '
@@ -89,7 +95,7 @@ test_expect_success 'ref_newer:hit' '
 	B:commit-2-3
 	EOF
 	echo "ref_newer(A,B):1" >expect &&
-	test_three_modes ref_newer
+	test_all_modes ref_newer
 '
 
 test_expect_success 'in_merge_bases:hit' '
@@ -98,7 +104,7 @@ test_expect_success 'in_merge_bases:hit' '
 	B:commit-8-8
 	EOF
 	echo "in_merge_bases(A,B):1" >expect &&
-	test_three_modes in_merge_bases
+	test_all_modes in_merge_bases
 '
 
 test_expect_success 'in_merge_bases:miss' '
@@ -107,7 +113,37 @@ test_expect_success 'in_merge_bases:miss' '
 	B:commit-5-9
 	EOF
 	echo "in_merge_bases(A,B):0" >expect &&
-	test_three_modes in_merge_bases
+	test_all_modes in_merge_bases
+'
+
+test_expect_success 'in_merge_bases_many:hit' '
+	cat >input <<-\EOF &&
+	A:commit-6-8
+	X:commit-6-9
+	X:commit-5-7
+	EOF
+	echo "in_merge_bases_many(A,X):1" >expect &&
+	test_all_modes in_merge_bases_many
+'
+
+test_expect_success 'in_merge_bases_many:miss' '
+	cat >input <<-\EOF &&
+	A:commit-6-8
+	X:commit-7-7
+	X:commit-8-6
+	EOF
+	echo "in_merge_bases_many(A,X):0" >expect &&
+	test_all_modes in_merge_bases_many
+'
+
+test_expect_success 'in_merge_bases_many:miss-heuristic' '
+	cat >input <<-\EOF &&
+	A:commit-6-8
+	X:commit-7-5
+	X:commit-6-6
+	EOF
+	echo "in_merge_bases_many(A,X):0" >expect &&
+	test_all_modes in_merge_bases_many
 '
 
 test_expect_success 'is_descendant_of:hit' '
@@ -118,7 +154,7 @@ test_expect_success 'is_descendant_of:hit' '
 	X:commit-1-1
 	EOF
 	echo "is_descendant_of(A,X):1" >expect &&
-	test_three_modes is_descendant_of
+	test_all_modes is_descendant_of
 '
 
 test_expect_success 'is_descendant_of:miss' '
@@ -129,7 +165,7 @@ test_expect_success 'is_descendant_of:miss' '
 	X:commit-7-6
 	EOF
 	echo "is_descendant_of(A,X):0" >expect &&
-	test_three_modes is_descendant_of
+	test_all_modes is_descendant_of
 '
 
 test_expect_success 'get_merge_bases_many' '
@@ -144,7 +180,7 @@ test_expect_success 'get_merge_bases_many' '
 		git rev-parse commit-5-6 \
 			      commit-4-7 | sort
 	} >expect &&
-	test_three_modes get_merge_bases_many
+	test_all_modes get_merge_bases_many
 '
 
 test_expect_success 'reduce_heads' '
@@ -166,7 +202,7 @@ test_expect_success 'reduce_heads' '
 			      commit-2-8 \
 			      commit-1-10 | sort
 	} >expect &&
-	test_three_modes reduce_heads
+	test_all_modes reduce_heads
 '
 
 test_expect_success 'can_all_from_reach:hit' '
@@ -189,7 +225,7 @@ test_expect_success 'can_all_from_reach:hit' '
 	Y:commit-8-1
 	EOF
 	echo "can_all_from_reach(X,Y):1" >expect &&
-	test_three_modes can_all_from_reach
+	test_all_modes can_all_from_reach
 '
 
 test_expect_success 'can_all_from_reach:miss' '
@@ -211,7 +247,7 @@ test_expect_success 'can_all_from_reach:miss' '
 	Y:commit-8-5
 	EOF
 	echo "can_all_from_reach(X,Y):0" >expect &&
-	test_three_modes can_all_from_reach
+	test_all_modes can_all_from_reach
 '
 
 test_expect_success 'can_all_from_reach_with_flag: tags case' '
@@ -234,7 +270,7 @@ test_expect_success 'can_all_from_reach_with_flag: tags case' '
 	Y:commit-8-1
 	EOF
 	echo "can_all_from_reach_with_flag(X,_,_,0,0):1" >expect &&
-	test_three_modes can_all_from_reach_with_flag
+	test_all_modes can_all_from_reach_with_flag
 '
 
 test_expect_success 'commit_contains:hit' '
@@ -250,8 +286,8 @@ test_expect_success 'commit_contains:hit' '
 	X:commit-9-3
 	EOF
 	echo "commit_contains(_,A,X,_):1" >expect &&
-	test_three_modes commit_contains &&
-	test_three_modes commit_contains --tag
+	test_all_modes commit_contains &&
+	test_all_modes commit_contains --tag
 '
 
 test_expect_success 'commit_contains:miss' '
@@ -267,8 +303,8 @@ test_expect_success 'commit_contains:miss' '
 	X:commit-9-3
 	EOF
 	echo "commit_contains(_,A,X,_):0" >expect &&
-	test_three_modes commit_contains &&
-	test_three_modes commit_contains --tag
+	test_all_modes commit_contains &&
+	test_all_modes commit_contains --tag
 '
 
 test_expect_success 'rev-list: basic topo-order' '
@@ -280,7 +316,7 @@ test_expect_success 'rev-list: basic topo-order' '
 		commit-6-2 commit-5-2 commit-4-2 commit-3-2 commit-2-2 commit-1-2 \
 		commit-6-1 commit-5-1 commit-4-1 commit-3-1 commit-2-1 commit-1-1 \
 	>expect &&
-	run_three_modes git rev-list --topo-order commit-6-6
+	run_all_modes git rev-list --topo-order commit-6-6
 '
 
 test_expect_success 'rev-list: first-parent topo-order' '
@@ -292,7 +328,7 @@ test_expect_success 'rev-list: first-parent topo-order' '
 		commit-6-2 \
 		commit-6-1 commit-5-1 commit-4-1 commit-3-1 commit-2-1 commit-1-1 \
 	>expect &&
-	run_three_modes git rev-list --first-parent --topo-order commit-6-6
+	run_all_modes git rev-list --first-parent --topo-order commit-6-6
 '
 
 test_expect_success 'rev-list: range topo-order' '
@@ -304,7 +340,7 @@ test_expect_success 'rev-list: range topo-order' '
 		commit-6-2 commit-5-2 commit-4-2 \
 		commit-6-1 commit-5-1 commit-4-1 \
 	>expect &&
-	run_three_modes git rev-list --topo-order commit-3-3..commit-6-6
+	run_all_modes git rev-list --topo-order commit-3-3..commit-6-6
 '
 
 test_expect_success 'rev-list: range topo-order' '
@@ -316,7 +352,7 @@ test_expect_success 'rev-list: range topo-order' '
 		commit-6-2 commit-5-2 commit-4-2 \
 		commit-6-1 commit-5-1 commit-4-1 \
 	>expect &&
-	run_three_modes git rev-list --topo-order commit-3-8..commit-6-6
+	run_all_modes git rev-list --topo-order commit-3-8..commit-6-6
 '
 
 test_expect_success 'rev-list: first-parent range topo-order' '
@@ -328,7 +364,7 @@ test_expect_success 'rev-list: first-parent range topo-order' '
 		commit-6-2 \
 		commit-6-1 commit-5-1 commit-4-1 \
 	>expect &&
-	run_three_modes git rev-list --first-parent --topo-order commit-3-8..commit-6-6
+	run_all_modes git rev-list --first-parent --topo-order commit-3-8..commit-6-6
 '
 
 test_expect_success 'rev-list: ancestry-path topo-order' '
@@ -338,7 +374,7 @@ test_expect_success 'rev-list: ancestry-path topo-order' '
 		commit-6-4 commit-5-4 commit-4-4 commit-3-4 \
 		commit-6-3 commit-5-3 commit-4-3 \
 	>expect &&
-	run_three_modes git rev-list --topo-order --ancestry-path commit-3-3..commit-6-6
+	run_all_modes git rev-list --topo-order --ancestry-path commit-3-3..commit-6-6
 '
 
 test_expect_success 'rev-list: symmetric difference topo-order' '
@@ -352,7 +388,7 @@ test_expect_success 'rev-list: symmetric difference topo-order' '
 		commit-3-8 commit-2-8 commit-1-8 \
 		commit-3-7 commit-2-7 commit-1-7 \
 	>expect &&
-	run_three_modes git rev-list --topo-order commit-3-8...commit-6-6
+	run_all_modes git rev-list --topo-order commit-3-8...commit-6-6
 '
 
 test_expect_success 'get_reachable_subset:all' '
@@ -372,7 +408,7 @@ test_expect_success 'get_reachable_subset:all' '
 			      commit-1-7 \
 			      commit-5-6 | sort
 	) >expect &&
-	test_three_modes get_reachable_subset
+	test_all_modes get_reachable_subset
 '
 
 test_expect_success 'get_reachable_subset:some' '
@@ -390,7 +426,7 @@ test_expect_success 'get_reachable_subset:some' '
 		git rev-parse commit-3-3 \
 			      commit-1-7 | sort
 	) >expect &&
-	test_three_modes get_reachable_subset
+	test_all_modes get_reachable_subset
 '
 
 test_expect_success 'get_reachable_subset:none' '
@@ -404,7 +440,176 @@ test_expect_success 'get_reachable_subset:none' '
 	Y:commit-2-8
 	EOF
 	echo "get_reachable_subset(X,Y)" >expect &&
-	test_three_modes get_reachable_subset
+	test_all_modes get_reachable_subset
+'
+
+test_expect_success 'for-each-ref ahead-behind:linear' '
+	cat >input <<-\EOF &&
+	refs/heads/commit-1-1
+	refs/heads/commit-1-3
+	refs/heads/commit-1-5
+	refs/heads/commit-1-8
+	EOF
+	cat >expect <<-\EOF &&
+	refs/heads/commit-1-1 0 8
+	refs/heads/commit-1-3 0 6
+	refs/heads/commit-1-5 0 4
+	refs/heads/commit-1-8 0 1
+	EOF
+	run_all_modes git for-each-ref \
+		--format="%(refname) %(ahead-behind:commit-1-9)" --stdin
+'
+
+test_expect_success 'for-each-ref ahead-behind:all' '
+	cat >input <<-\EOF &&
+	refs/heads/commit-1-1
+	refs/heads/commit-2-4
+	refs/heads/commit-4-2
+	refs/heads/commit-4-4
+	EOF
+	cat >expect <<-\EOF &&
+	refs/heads/commit-1-1 0 24
+	refs/heads/commit-2-4 0 17
+	refs/heads/commit-4-2 0 17
+	refs/heads/commit-4-4 0 9
+	EOF
+	run_all_modes git for-each-ref \
+		--format="%(refname) %(ahead-behind:commit-5-5)" --stdin
+'
+
+test_expect_success 'for-each-ref ahead-behind:some' '
+	cat >input <<-\EOF &&
+	refs/heads/commit-1-1
+	refs/heads/commit-5-3
+	refs/heads/commit-4-8
+	refs/heads/commit-9-9
+	EOF
+	cat >expect <<-\EOF &&
+	refs/heads/commit-1-1 0 53
+	refs/heads/commit-4-8 8 30
+	refs/heads/commit-5-3 0 39
+	refs/heads/commit-9-9 27 0
+	EOF
+	run_all_modes git for-each-ref \
+		--format="%(refname) %(ahead-behind:commit-9-6)" --stdin
+'
+
+test_expect_success 'for-each-ref ahead-behind:some, multibase' '
+	cat >input <<-\EOF &&
+	refs/heads/commit-1-1
+	refs/heads/commit-5-3
+	refs/heads/commit-7-8
+	refs/heads/commit-4-8
+	refs/heads/commit-9-9
+	EOF
+	cat >expect <<-\EOF &&
+	refs/heads/commit-1-1 0 53 0 53
+	refs/heads/commit-4-8 8 30 0 22
+	refs/heads/commit-5-3 0 39 0 39
+	refs/heads/commit-7-8 14 12 8 6
+	refs/heads/commit-9-9 27 0 27 0
+	EOF
+	run_all_modes git for-each-ref \
+		--format="%(refname) %(ahead-behind:commit-9-6) %(ahead-behind:commit-6-9)" \
+		--stdin
+'
+
+test_expect_success 'for-each-ref ahead-behind:none' '
+	cat >input <<-\EOF &&
+	refs/heads/commit-7-5
+	refs/heads/commit-4-8
+	refs/heads/commit-9-9
+	EOF
+	cat >expect <<-\EOF &&
+	refs/heads/commit-4-8 16 16
+	refs/heads/commit-7-5 7 4
+	refs/heads/commit-9-9 49 0
+	EOF
+	run_all_modes git for-each-ref \
+		--format="%(refname) %(ahead-behind:commit-8-4)" --stdin
+'
+
+test_expect_success 'for-each-ref merged:linear' '
+	cat >input <<-\EOF &&
+	refs/heads/commit-1-1
+	refs/heads/commit-1-3
+	refs/heads/commit-1-5
+	refs/heads/commit-1-8
+	refs/heads/commit-2-1
+	refs/heads/commit-5-1
+	refs/heads/commit-9-1
+	EOF
+	cat >expect <<-\EOF &&
+	refs/heads/commit-1-1
+	refs/heads/commit-1-3
+	refs/heads/commit-1-5
+	refs/heads/commit-1-8
+	EOF
+	run_all_modes git for-each-ref --merged=commit-1-9 \
+		--format="%(refname)" --stdin
+'
+
+test_expect_success 'for-each-ref merged:all' '
+	cat >input <<-\EOF &&
+	refs/heads/commit-1-1
+	refs/heads/commit-2-4
+	refs/heads/commit-4-2
+	refs/heads/commit-4-4
+	EOF
+	cat >expect <<-\EOF &&
+	refs/heads/commit-1-1
+	refs/heads/commit-2-4
+	refs/heads/commit-4-2
+	refs/heads/commit-4-4
+	EOF
+	run_all_modes git for-each-ref --merged=commit-5-5 \
+		--format="%(refname)" --stdin
+'
+
+test_expect_success 'for-each-ref ahead-behind:some' '
+	cat >input <<-\EOF &&
+	refs/heads/commit-1-1
+	refs/heads/commit-5-3
+	refs/heads/commit-4-8
+	refs/heads/commit-9-9
+	EOF
+	cat >expect <<-\EOF &&
+	refs/heads/commit-1-1
+	refs/heads/commit-5-3
+	EOF
+	run_all_modes git for-each-ref --merged=commit-9-6 \
+		--format="%(refname)" --stdin
+'
+
+test_expect_success 'for-each-ref merged:some, multibase' '
+	cat >input <<-\EOF &&
+	refs/heads/commit-1-1
+	refs/heads/commit-5-3
+	refs/heads/commit-7-8
+	refs/heads/commit-4-8
+	refs/heads/commit-9-9
+	EOF
+	cat >expect <<-\EOF &&
+	refs/heads/commit-1-1
+	refs/heads/commit-4-8
+	refs/heads/commit-5-3
+	EOF
+	run_all_modes git for-each-ref \
+		--merged=commit-5-8 \
+		--merged=commit-8-5 \
+		--format="%(refname)" \
+		--stdin
+'
+
+test_expect_success 'for-each-ref merged:none' '
+	cat >input <<-\EOF &&
+	refs/heads/commit-7-5
+	refs/heads/commit-4-8
+	refs/heads/commit-9-9
+	EOF
+	>expect &&
+	run_all_modes git for-each-ref --merged=commit-8-4 \
+		--format="%(refname)" --stdin
 '
 
 test_done
diff --git a/t/t6700-tree-depth.sh b/t/t6700-tree-depth.sh
new file mode 100755
index 0000000..9e70a7c
--- /dev/null
+++ b/t/t6700-tree-depth.sh
@@ -0,0 +1,95 @@
+#!/bin/sh
+
+test_description='handling of deep trees in various commands'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+# We'll test against two depths here: a small one that will let us check the
+# behavior of the config setting easily, and a large one that should be
+# forbidden by default. Testing the default depth will let us know whether our
+# default is enough to prevent segfaults on systems that run the tests.
+small_depth=50
+big_depth=4100
+
+small_ok="-c core.maxtreedepth=$small_depth"
+small_no="-c core.maxtreedepth=$((small_depth-1))"
+
+# usage: mkdeep <name> <depth>
+#   Create a tag <name> containing a file whose path has depth <depth>.
+#
+# We'll use fast-import here for two reasons:
+#
+#   1. It's faster than creating $big_depth tree objects.
+#
+#   2. As we tighten tree limits, it's more likely to allow large sizes
+#      than trying to stuff a deep path into the index.
+mkdeep () {
+	{
+		echo "commit refs/tags/$1" &&
+		echo "committer foo <foo@example.com> 1234 -0000" &&
+		echo "data <<EOF" &&
+		echo "the commit message" &&
+		echo "EOF" &&
+
+		printf 'M 100644 inline ' &&
+		i=0 &&
+		while test $i -lt $2
+		do
+			printf 'a/'
+			i=$((i+1))
+		done &&
+		echo "file" &&
+
+		echo "data <<EOF" &&
+		echo "the file contents" &&
+		echo "EOF" &&
+		echo
+	} | git fast-import
+}
+
+test_expect_success 'create small tree' '
+	mkdeep small $small_depth
+'
+
+test_expect_success 'create big tree' '
+	mkdeep big $big_depth
+'
+
+test_expect_success 'limit recursion of git-archive' '
+	git $small_ok archive small >/dev/null &&
+	test_must_fail git $small_no archive small >/dev/null
+'
+
+test_expect_success 'default limit for git-archive fails gracefully' '
+	test_must_fail git archive big >/dev/null
+'
+
+test_expect_success 'limit recursion of ls-tree -r' '
+	git $small_ok ls-tree -r small &&
+	test_must_fail git $small_no ls-tree -r small
+'
+
+test_expect_success 'default limit for ls-tree fails gracefully' '
+	test_must_fail git ls-tree -r big >/dev/null
+'
+
+test_expect_success 'limit recursion of rev-list --objects' '
+	git $small_ok rev-list --objects small >/dev/null &&
+	test_must_fail git $small_no rev-list --objects small >/dev/null
+'
+
+test_expect_success 'default limit for rev-list fails gracefully' '
+	test_must_fail git rev-list --objects big >/dev/null
+'
+
+test_expect_success 'limit recursion of diff-tree -r' '
+	git $small_ok diff-tree -r $EMPTY_TREE small &&
+	test_must_fail git $small_no diff-tree -r $EMPTY_TREE small
+'
+
+test_expect_success 'default limit for diff-tree fails gracefully' '
+	test_must_fail git diff-tree -r $EMPTY_TREE big
+'
+
+test_done
diff --git a/t/t7001-mv.sh b/t/t7001-mv.sh
index 63d5f41..879a6dc 100755
--- a/t/t7001-mv.sh
+++ b/t/t7001-mv.sh
@@ -2,75 +2,99 @@
 
 test_description='git mv in subdirs'
 . ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-diff-data.sh
 
-test_expect_success \
-    'prepare reference tree' \
-    'mkdir path0 path1 &&
-     cp "$TEST_DIRECTORY"/../COPYING path0/COPYING &&
-     git add path0/COPYING &&
-     git commit -m add -a'
+index_at_path () {
+	git ls-files --format='%(objectmode) %(objectname) %(stage)' "$@"
+}
 
-test_expect_success \
-    'moving the file out of subdirectory' \
-    'cd path0 && git mv COPYING ../path1/COPYING'
+test_expect_success 'mv -f refreshes updated index entry' '
+	echo test >bar &&
+	git add bar &&
+	git commit -m test &&
+
+	echo foo >foo &&
+	git add foo &&
+
+	# Wait one second to ensure ctime of rename will differ from original
+	# file creation ctime.
+	sleep 1 &&
+	git mv -f foo bar &&
+	git reset --merge HEAD &&
+
+	# Verify the index has been reset
+	git diff-files >out &&
+	test_must_be_empty out
+'
+
+test_expect_success 'prepare reference tree' '
+	mkdir path0 path1 &&
+	COPYING_test_data >path0/COPYING &&
+	git add path0/COPYING &&
+	git commit -m add -a
+'
+
+test_expect_success 'moving the file out of subdirectory' '
+	git -C path0 mv COPYING ../path1/COPYING
+'
 
 # in path0 currently
-test_expect_success \
-    'commiting the change' \
-    'cd .. && git commit -m move-out -a'
+test_expect_success 'commiting the change' '
+	git commit -m move-out -a
+'
 
-test_expect_success \
-    'checking the commit' \
-    'git diff-tree -r -M --name-status  HEAD^ HEAD >actual &&
-    grep "^R100..*path0/COPYING..*path1/COPYING" actual'
+test_expect_success 'checking the commit' '
+	git diff-tree -r -M --name-status  HEAD^ HEAD >actual &&
+	grep "^R100..*path0/COPYING..*path1/COPYING" actual
+'
 
-test_expect_success \
-    'moving the file back into subdirectory' \
-    'cd path0 && git mv ../path1/COPYING COPYING'
+test_expect_success 'moving the file back into subdirectory' '
+	git -C path0 mv ../path1/COPYING COPYING
+'
 
 # in path0 currently
-test_expect_success \
-    'commiting the change' \
-    'cd .. && git commit -m move-in -a'
-
-test_expect_success \
-    'checking the commit' \
-    'git diff-tree -r -M --name-status  HEAD^ HEAD >actual &&
-    grep "^R100..*path1/COPYING..*path0/COPYING" actual'
-
-test_expect_success \
-    'mv --dry-run does not move file' \
-    'git mv -n path0/COPYING MOVED &&
-     test -f path0/COPYING &&
-     test ! -f MOVED'
-
-test_expect_success \
-    'checking -k on non-existing file' \
-    'git mv -k idontexist path0'
-
-test_expect_success \
-    'checking -k on untracked file' \
-    'touch untracked1 &&
-     git mv -k untracked1 path0 &&
-     test -f untracked1 &&
-     test ! -f path0/untracked1'
-
-test_expect_success \
-    'checking -k on multiple untracked files' \
-    'touch untracked2 &&
-     git mv -k untracked1 untracked2 path0 &&
-     test -f untracked1 &&
-     test -f untracked2 &&
-     test ! -f path0/untracked1 &&
-     test ! -f path0/untracked2'
-
-test_expect_success \
-    'checking -f on untracked file with existing target' \
-    'touch path0/untracked1 &&
-     test_must_fail git mv -f untracked1 path0 &&
-     test ! -f .git/index.lock &&
-     test -f untracked1 &&
-     test -f path0/untracked1'
+test_expect_success 'commiting the change' '
+	git commit -m move-in -a
+'
+
+test_expect_success 'checking the commit' '
+	git diff-tree -r -M --name-status  HEAD^ HEAD >actual &&
+	grep "^R100..*path1/COPYING..*path0/COPYING" actual
+'
+
+test_expect_success 'mv --dry-run does not move file' '
+	git mv -n path0/COPYING MOVED &&
+	test_path_is_file path0/COPYING &&
+	test_path_is_missing MOVED
+'
+
+test_expect_success 'checking -k on non-existing file' '
+	git mv -k idontexist path0
+'
+
+test_expect_success 'checking -k on untracked file' '
+	>untracked1 &&
+	git mv -k untracked1 path0 &&
+	test_path_is_file untracked1 &&
+	test_path_is_missing path0/untracked1
+'
+
+test_expect_success 'checking -k on multiple untracked files' '
+	>untracked2 &&
+	git mv -k untracked1 untracked2 path0 &&
+	test_path_is_file untracked1 &&
+	test_path_is_file untracked2 &&
+	test_path_is_missing path0/untracked1 &&
+	test_path_is_missing path0/untracked2
+'
+
+test_expect_success 'checking -f on untracked file with existing target' '
+	>path0/untracked1 &&
+	test_must_fail git mv -f untracked1 path0 &&
+	test_path_is_missing .git/index.lock &&
+	test_path_is_file untracked1 &&
+	test_path_is_file path0/untracked1
+'
 
 # clean up the mess in case bad things happen
 rm -f idontexist untracked1 untracked2 \
@@ -78,94 +102,104 @@ rm -f idontexist untracked1 untracked2 \
      .git/index.lock
 rmdir path1
 
-test_expect_success \
-    'moving to absent target with trailing slash' \
-    'test_must_fail git mv path0/COPYING no-such-dir/ &&
-     test_must_fail git mv path0/COPYING no-such-dir// &&
-     git mv path0/ no-such-dir/ &&
-     test_path_is_dir no-such-dir'
-
-test_expect_success \
-    'clean up' \
-    'git reset --hard'
-
-test_expect_success \
-    'moving to existing untracked target with trailing slash' \
-    'mkdir path1 &&
-     git mv path0/ path1/ &&
-     test_path_is_dir path1/path0/'
-
-test_expect_success \
-    'moving to existing tracked target with trailing slash' \
-    'mkdir path2 &&
-     >path2/file && git add path2/file &&
-     git mv path1/path0/ path2/ &&
-     test_path_is_dir path2/path0/'
-
-test_expect_success \
-    'clean up' \
-    'git reset --hard'
-
-test_expect_success \
-    'adding another file' \
-    'cp "$TEST_DIRECTORY"/../README.md path0/README &&
-     git add path0/README &&
-     git commit -m add2 -a'
-
-test_expect_success \
-    'moving whole subdirectory' \
-    'git mv path0 path2'
-
-test_expect_success \
-    'commiting the change' \
-    'git commit -m dir-move -a'
-
-test_expect_success \
-    'checking the commit' \
-    'git diff-tree -r -M --name-status  HEAD^ HEAD >actual &&
-     grep "^R100..*path0/COPYING..*path2/COPYING" actual &&
-     grep "^R100..*path0/README..*path2/README" actual'
-
-test_expect_success \
-    'succeed when source is a prefix of destination' \
-    'git mv path2/COPYING path2/COPYING-renamed'
-
-test_expect_success \
-    'moving whole subdirectory into subdirectory' \
-    'git mv path2 path1'
-
-test_expect_success \
-    'commiting the change' \
-    'git commit -m dir-move -a'
-
-test_expect_success \
-    'checking the commit' \
-    'git diff-tree -r -M --name-status  HEAD^ HEAD >actual &&
-     grep "^R100..*path2/COPYING..*path1/path2/COPYING" actual &&
-     grep "^R100..*path2/README..*path1/path2/README" actual'
-
-test_expect_success \
-    'do not move directory over existing directory' \
-    'mkdir path0 && mkdir path0/path2 && test_must_fail git mv path2 path0'
-
-test_expect_success \
-    'move into "."' \
-    'git mv path1/path2/ .'
+test_expect_success 'moving to absent target with trailing slash' '
+	test_must_fail git mv path0/COPYING no-such-dir/ &&
+	test_must_fail git mv path0/COPYING no-such-dir// &&
+	git mv path0/ no-such-dir/ &&
+	test_path_is_dir no-such-dir
+'
+
+test_expect_success 'clean up' '
+	git reset --hard
+'
+
+test_expect_success 'moving to existing untracked target with trailing slash' '
+	mkdir path1 &&
+	git mv path0/ path1/ &&
+	test_path_is_dir path1/path0/
+'
+
+test_expect_success 'moving to existing tracked target with trailing slash' '
+	mkdir path2 &&
+	>path2/file && git add path2/file &&
+	git mv path1/path0/ path2/ &&
+	test_path_is_dir path2/path0/
+'
+
+test_expect_success 'clean up' '
+	git reset --hard
+'
+
+test_expect_success 'adding another file' '
+	COPYING_test_data | tr A-Za-z N-ZA-Mn-za-m >path0/README &&
+	git add path0/README &&
+	git commit -m add2 -a
+'
+
+test_expect_success 'moving whole subdirectory' '
+	git mv path0 path2
+'
+
+test_expect_success 'commiting the change' '
+	git commit -m dir-move -a
+'
+
+test_expect_success 'checking the commit' '
+	git diff-tree -r -M --name-status  HEAD^ HEAD >actual &&
+	grep "^R100..*path0/COPYING..*path2/COPYING" actual &&
+	grep "^R100..*path0/README..*path2/README" actual
+'
+
+test_expect_success 'succeed when source is a prefix of destination' '
+	git mv path2/COPYING path2/COPYING-renamed
+'
+
+test_expect_success 'moving whole subdirectory into subdirectory' '
+	git mv path2 path1
+'
+
+test_expect_success 'commiting the change' '
+	git commit -m dir-move -a
+'
+
+test_expect_success 'checking the commit' '
+	git diff-tree -r -M --name-status  HEAD^ HEAD >actual &&
+	grep "^R100..*path2/COPYING..*path1/path2/COPYING" actual &&
+	grep "^R100..*path2/README..*path1/path2/README" actual
+'
+
+test_expect_success 'do not move directory over existing directory' '
+	mkdir path0 &&
+	mkdir path0/path2 &&
+	test_must_fail git mv path2 path0
+'
+
+test_expect_success 'rename directory to non-existing directory' '
+	mkdir dir-a &&
+	>dir-a/f &&
+	git add dir-a &&
+	git mv dir-a non-existing-dir
+'
+
+test_expect_success 'move into "."' '
+	git mv path1/path2/ .
+'
 
 test_expect_success "Michael Cassar's test case" '
 	rm -fr .git papers partA &&
 	git init &&
 	mkdir -p papers/unsorted papers/all-papers partA &&
-	echo a > papers/unsorted/Thesis.pdf &&
-	echo b > partA/outline.txt &&
-	echo c > papers/unsorted/_another &&
+	echo a >papers/unsorted/Thesis.pdf &&
+	echo b >partA/outline.txt &&
+	echo c >papers/unsorted/_another &&
 	git add papers partA &&
 	T1=$(git write-tree) &&
 
 	git mv papers/unsorted/Thesis.pdf papers/all-papers/moo-blah.pdf &&
 
 	T=$(git write-tree) &&
-	git ls-tree -r $T | verbose grep partA/outline.txt
+	git ls-tree -r $T >out &&
+	grep partA/outline.txt out
 '
 
 rm -fr papers partA path?
@@ -181,43 +215,42 @@ test_expect_success "Sergey Vlasov's test case" '
 	git mv ab a
 '
 
-test_expect_success 'absolute pathname' '(
-
-	rm -fr mine &&
-	mkdir mine &&
-	cd mine &&
-	test_create_repo one &&
-	cd one &&
-	mkdir sub &&
-	>sub/file &&
-	git add sub/file &&
-
-	git mv sub "$(pwd)/in" &&
-	! test -d sub &&
-	test -d in &&
-	git ls-files --error-unmatch in/file
-
-
-)'
-
-test_expect_success 'absolute pathname outside should fail' '(
-
-	rm -fr mine &&
-	mkdir mine &&
-	cd mine &&
-	out=$(pwd) &&
-	test_create_repo one &&
-	cd one &&
-	mkdir sub &&
-	>sub/file &&
-	git add sub/file &&
-
-	test_must_fail git mv sub "$out/out" &&
-	test -d sub &&
-	! test -d ../in &&
-	git ls-files --error-unmatch sub/file
+test_expect_success 'absolute pathname' '
+	(
+		rm -fr mine &&
+		mkdir mine &&
+		cd mine &&
+		test_create_repo one &&
+		cd one &&
+		mkdir sub &&
+		>sub/file &&
+		git add sub/file &&
+
+		git mv sub "$(pwd)/in" &&
+		test_path_is_missing sub &&
+		test_path_is_dir in &&
+		git ls-files --error-unmatch in/file
+	)
+'
 
-)'
+test_expect_success 'absolute pathname outside should fail' '
+	(
+		rm -fr mine &&
+		mkdir mine &&
+		cd mine &&
+		out=$(pwd) &&
+		test_create_repo one &&
+		cd one &&
+		mkdir sub &&
+		>sub/file &&
+		git add sub/file &&
+
+		test_must_fail git mv sub "$out/out" &&
+		test_path_is_dir sub &&
+		test_path_is_missing ../in &&
+		git ls-files --error-unmatch sub/file
+	)
+'
 
 test_expect_success 'git mv to move multiple sources into a directory' '
 	rm -fr .git && git init &&
@@ -227,23 +260,24 @@ test_expect_success 'git mv to move multiple sources into a directory' '
 	git add dir/?.txt &&
 	git mv dir/a.txt dir/b.txt other &&
 	git ls-files >actual &&
-	{ echo other/a.txt; echo other/b.txt; } >expect &&
+	cat >expect <<-\EOF &&
+	other/a.txt
+	other/b.txt
+	EOF
 	test_cmp expect actual
 '
 
 test_expect_success 'git mv should not change sha1 of moved cache entry' '
-
 	rm -fr .git &&
 	git init &&
 	echo 1 >dirty &&
 	git add dirty &&
-	entry="$(git ls-files --stage dirty | cut -f 1)" &&
+	entry="$(index_at_path dirty)" &&
 	git mv dirty dirty2 &&
-	[ "$entry" = "$(git ls-files --stage dirty2 | cut -f 1)" ] &&
+	test "$entry" = "$(index_at_path dirty2)" &&
 	echo 2 >dirty2 &&
 	git mv dirty2 dirty &&
-	[ "$entry" = "$(git ls-files --stage dirty | cut -f 1)" ]
-
+	test "$entry" = "$(index_at_path dirty)"
 '
 
 rm -f dirty dirty2
@@ -262,11 +296,10 @@ test_expect_success 'git mv error on conflicted file' '
 	EOF
 
 	test_must_fail git mv conflict newname 2>actual &&
-	test_i18ngrep "conflicted" actual
+	test_grep "conflicted" actual
 '
 
 test_expect_success 'git mv should overwrite symlink to a file' '
-
 	rm -fr .git &&
 	git init &&
 	echo 1 >moved &&
@@ -274,18 +307,16 @@ test_expect_success 'git mv should overwrite symlink to a file' '
 	git add moved &&
 	test_must_fail git mv moved symlink &&
 	git mv -f moved symlink &&
-	! test -e moved &&
-	test -f symlink &&
+	test_path_is_missing moved &&
+	test_path_is_file symlink &&
 	test "$(cat symlink)" = 1 &&
 	git update-index --refresh &&
 	git diff-files --quiet
-
 '
 
 rm -f moved symlink
 
 test_expect_success 'git mv should overwrite file with a symlink' '
-
 	rm -fr .git &&
 	git init &&
 	echo 1 >moved &&
@@ -293,20 +324,19 @@ test_expect_success 'git mv should overwrite file with a symlink' '
 	git add moved &&
 	test_must_fail git mv symlink moved &&
 	git mv -f symlink moved &&
-	! test -e symlink &&
+	test_path_is_missing symlink &&
 	git update-index --refresh &&
 	git diff-files --quiet
-
 '
 
 test_expect_success SYMLINKS 'check moved symlink' '
-
-	test -h moved
+	test_path_is_symlink moved
 '
 
 rm -f moved symlink
 
 test_expect_success 'setup submodule' '
+	test_config_global protocol.file.allow always &&
 	git commit -m initial &&
 	git reset --hard &&
 	git submodule add ./. sub &&
@@ -324,7 +354,7 @@ test_expect_success 'git mv cannot move a submodule in a file' '
 '
 
 test_expect_success 'git mv moves a submodule with a .git directory and no .gitmodules' '
-	entry="$(git ls-files --stage sub | cut -f 1)" &&
+	entry="$(index_at_path sub)" &&
 	git rm .gitmodules &&
 	(
 		cd sub &&
@@ -334,12 +364,9 @@ test_expect_success 'git mv moves a submodule with a .git directory and no .gitm
 	) &&
 	mkdir mod &&
 	git mv sub mod/sub &&
-	! test -e sub &&
-	[ "$entry" = "$(git ls-files --stage mod/sub | cut -f 1)" ] &&
-	(
-		cd mod/sub &&
-		git status
-	) &&
+	test_path_is_missing sub &&
+	test "$entry" = "$(index_at_path mod/sub)" &&
+	git -C mod/sub status &&
 	git update-index --refresh &&
 	git diff-files --quiet
 '
@@ -348,7 +375,7 @@ test_expect_success 'git mv moves a submodule with a .git directory and .gitmodu
 	rm -rf mod &&
 	git reset --hard &&
 	git submodule update &&
-	entry="$(git ls-files --stage sub | cut -f 1)" &&
+	entry="$(index_at_path sub)" &&
 	(
 		cd sub &&
 		rm -f .git &&
@@ -357,12 +384,9 @@ test_expect_success 'git mv moves a submodule with a .git directory and .gitmodu
 	) &&
 	mkdir mod &&
 	git mv sub mod/sub &&
-	! test -e sub &&
-	[ "$entry" = "$(git ls-files --stage mod/sub | cut -f 1)" ] &&
-	(
-		cd mod/sub &&
-		git status
-	) &&
+	test_path_is_missing sub &&
+	test "$entry" = "$(index_at_path mod/sub)" &&
+	git -C mod/sub status &&
 	echo mod/sub >expected &&
 	git config -f .gitmodules submodule.sub.path >actual &&
 	test_cmp expected actual &&
@@ -374,18 +398,12 @@ test_expect_success 'git mv moves a submodule with gitfile' '
 	rm -rf mod &&
 	git reset --hard &&
 	git submodule update &&
-	entry="$(git ls-files --stage sub | cut -f 1)" &&
+	entry="$(index_at_path sub)" &&
 	mkdir mod &&
-	(
-		cd mod &&
-		git mv ../sub/ .
-	) &&
-	! test -e sub &&
-	[ "$entry" = "$(git ls-files --stage mod/sub | cut -f 1)" ] &&
-	(
-		cd mod/sub &&
-		git status
-	) &&
+	git -C mod mv ../sub/ . &&
+	test_path_is_missing sub &&
+	test "$entry" = "$(index_at_path mod/sub)" &&
+	git -C mod/sub status &&
 	echo mod/sub >expected &&
 	git config -f .gitmodules submodule.sub.path >actual &&
 	test_cmp expected actual &&
@@ -398,16 +416,13 @@ test_expect_success 'mv does not complain when no .gitmodules file is found' '
 	git reset --hard &&
 	git submodule update &&
 	git rm .gitmodules &&
-	entry="$(git ls-files --stage sub | cut -f 1)" &&
+	entry="$(index_at_path sub)" &&
 	mkdir mod &&
 	git mv sub mod/sub 2>actual.err &&
 	test_must_be_empty actual.err &&
-	! test -e sub &&
-	[ "$entry" = "$(git ls-files --stage mod/sub | cut -f 1)" ] &&
-	(
-		cd mod/sub &&
-		git status
-	) &&
+	test_path_is_missing sub &&
+	test "$entry" = "$(index_at_path mod/sub)" &&
+	git -C mod/sub status &&
 	git update-index --refresh &&
 	git diff-files --quiet
 '
@@ -417,21 +432,18 @@ test_expect_success 'mv will error out on a modified .gitmodules file unless sta
 	git reset --hard &&
 	git submodule update &&
 	git config -f .gitmodules foo.bar true &&
-	entry="$(git ls-files --stage sub | cut -f 1)" &&
+	entry="$(index_at_path sub)" &&
 	mkdir mod &&
 	test_must_fail git mv sub mod/sub 2>actual.err &&
-	test -s actual.err &&
-	test -e sub &&
+	test_file_not_empty actual.err &&
+	test_path_exists sub &&
 	git diff-files --quiet -- sub &&
 	git add .gitmodules &&
 	git mv sub mod/sub 2>actual.err &&
 	test_must_be_empty actual.err &&
-	! test -e sub &&
-	[ "$entry" = "$(git ls-files --stage mod/sub | cut -f 1)" ] &&
-	(
-		cd mod/sub &&
-		git status
-	) &&
+	test_path_is_missing sub &&
+	test "$entry" = "$(index_at_path mod/sub)" &&
+	git -C mod/sub status &&
 	git update-index --refresh &&
 	git diff-files --quiet
 '
@@ -442,17 +454,14 @@ test_expect_success 'mv issues a warning when section is not found in .gitmodule
 	git submodule update &&
 	git config -f .gitmodules --remove-section submodule.sub &&
 	git add .gitmodules &&
-	entry="$(git ls-files --stage sub | cut -f 1)" &&
+	entry="$(index_at_path sub)" &&
 	echo "warning: Could not find section in .gitmodules where path=sub" >expect.err &&
 	mkdir mod &&
 	git mv sub mod/sub 2>actual.err &&
-	test_i18ncmp expect.err actual.err &&
-	! test -e sub &&
-	[ "$entry" = "$(git ls-files --stage mod/sub | cut -f 1)" ] &&
-	(
-		cd mod/sub &&
-		git status
-	) &&
+	test_cmp expect.err actual.err &&
+	test_path_is_missing sub &&
+	test "$entry" = "$(index_at_path mod/sub)" &&
+	git -C mod/sub status &&
 	git update-index --refresh &&
 	git diff-files --quiet
 '
@@ -463,7 +472,7 @@ test_expect_success 'mv --dry-run does not touch the submodule or .gitmodules' '
 	git submodule update &&
 	mkdir mod &&
 	git mv -n sub mod/sub 2>actual.err &&
-	test -f sub/.git &&
+	test_path_is_file sub/.git &&
 	git diff-index --exit-code HEAD &&
 	git update-index --refresh &&
 	git diff-files --quiet -- sub .gitmodules
@@ -473,14 +482,14 @@ test_expect_success 'checking out a commit before submodule moved needs manual u
 	git mv sub sub2 &&
 	git commit -m "moved sub to sub2" &&
 	git checkout -q HEAD^ 2>actual &&
-	test_i18ngrep "^warning: unable to rmdir '\''sub2'\'':" actual &&
+	test_grep "^warning: unable to rmdir '\''sub2'\'':" actual &&
 	git status -s sub2 >actual &&
 	echo "?? sub2/" >expected &&
 	test_cmp expected actual &&
-	! test -f sub/.git &&
-	test -f sub2/.git &&
+	test_path_is_missing sub/.git &&
+	test_path_is_file sub2/.git &&
 	git submodule update &&
-	test -f sub/.git &&
+	test_path_is_file sub/.git &&
 	rm -rf sub2 &&
 	git diff-index --exit-code HEAD &&
 	git update-index --refresh &&
@@ -513,17 +522,20 @@ test_expect_success 'moving a submodule in nested directories' '
 '
 
 test_expect_success 'moving nested submodules' '
+	test_config_global protocol.file.allow always &&
 	git commit -am "cleanup commit" &&
 	mkdir sub_nested_nested &&
-	(cd sub_nested_nested &&
-		touch nested_level2 &&
+	(
+		cd sub_nested_nested &&
+		>nested_level2 &&
 		git init &&
 		git add . &&
 		git commit -m "nested level 2"
 	) &&
 	mkdir sub_nested &&
-	(cd sub_nested &&
-		touch nested_level1 &&
+	(
+		cd sub_nested &&
+		>nested_level1 &&
 		git init &&
 		git add . &&
 		git commit -m "nested level 1" &&
diff --git a/t/t7002-mv-sparse-checkout.sh b/t/t7002-mv-sparse-checkout.sh
new file mode 100755
index 0000000..26582ae
--- /dev/null
+++ b/t/t7002-mv-sparse-checkout.sh
@@ -0,0 +1,517 @@
+#!/bin/sh
+
+test_description='git mv in sparse working trees'
+
+. ./test-lib.sh
+
+setup_sparse_checkout () {
+	mkdir folder1 &&
+	touch folder1/file1 &&
+	git add folder1 &&
+	git sparse-checkout set --cone sub
+}
+
+cleanup_sparse_checkout () {
+	git sparse-checkout disable &&
+	git reset --hard
+}
+
+test_expect_success 'setup' "
+	mkdir -p sub/dir sub/dir2 &&
+	touch a b c sub/d sub/dir/e sub/dir2/e &&
+	git add -A &&
+	git commit -m files &&
+
+	cat >sparse_error_header <<-EOF &&
+	The following paths and/or pathspecs matched paths that exist
+	outside of your sparse-checkout definition, so will not be
+	updated in the index:
+	EOF
+
+	cat >sparse_hint <<-EOF &&
+	hint: If you intend to update such entries, try one of the following:
+	hint: * Use the --sparse option.
+	hint: * Disable or modify the sparsity rules.
+	hint: Disable this message with \"git config advice.updateSparsePath false\"
+	EOF
+
+	cat >dirty_error_header <<-EOF &&
+	The following paths have been moved outside the
+	sparse-checkout definition but are not sparse due to local
+	modifications.
+	EOF
+
+	cat >dirty_hint <<-EOF
+	hint: To correct the sparsity of these paths, do the following:
+	hint: * Use \"git add --sparse <paths>\" to update the index
+	hint: * Use \"git sparse-checkout reapply\" to apply the sparsity rules
+	hint: Disable this message with \"git config advice.updateSparsePath false\"
+	EOF
+"
+
+test_expect_success 'mv refuses to move sparse-to-sparse' '
+	test_when_finished rm -f e &&
+	git reset --hard &&
+	git sparse-checkout set --no-cone a &&
+	touch b &&
+	test_must_fail git mv b e 2>stderr &&
+	cat sparse_error_header >expect &&
+	echo b >>expect &&
+	echo e >>expect &&
+	cat sparse_hint >>expect &&
+	test_cmp expect stderr &&
+	git mv --sparse b e 2>stderr &&
+	test_must_be_empty stderr
+'
+
+test_expect_success 'mv refuses to move sparse-to-sparse, ignores failure' '
+	test_when_finished rm -f b c e &&
+	git reset --hard &&
+	git sparse-checkout set a &&
+
+	# tracked-to-untracked
+	touch b &&
+	git mv -k b e 2>stderr &&
+	test_path_exists b &&
+	test_path_is_missing e &&
+	cat sparse_error_header >expect &&
+	echo b >>expect &&
+	echo e >>expect &&
+	cat sparse_hint >>expect &&
+	test_cmp expect stderr &&
+
+	git mv --sparse b e 2>stderr &&
+	test_must_be_empty stderr &&
+	test_path_is_missing b &&
+	test_path_exists e &&
+
+	# tracked-to-tracked
+	git reset --hard &&
+	touch b &&
+	git mv -k b c 2>stderr &&
+	test_path_exists b &&
+	test_path_is_missing c &&
+	cat sparse_error_header >expect &&
+	echo b >>expect &&
+	echo c >>expect &&
+	cat sparse_hint >>expect &&
+	test_cmp expect stderr &&
+
+	git mv --sparse b c 2>stderr &&
+	test_must_be_empty stderr &&
+	test_path_is_missing b &&
+	test_path_exists c
+'
+
+test_expect_success 'mv refuses to move non-sparse-to-sparse' '
+	test_when_finished rm -f b c e &&
+	git reset --hard &&
+	git sparse-checkout set a &&
+
+	# tracked-to-untracked
+	test_must_fail git mv a e 2>stderr &&
+	test_path_exists a &&
+	test_path_is_missing e &&
+	cat sparse_error_header >expect &&
+	echo e >>expect &&
+	cat sparse_hint >>expect &&
+	test_cmp expect stderr &&
+	git mv --sparse a e 2>stderr &&
+	test_must_be_empty stderr &&
+	test_path_is_missing a &&
+	test_path_exists e &&
+
+	# tracked-to-tracked
+	rm e &&
+	git reset --hard &&
+	test_must_fail git mv a c 2>stderr &&
+	test_path_exists a &&
+	test_path_is_missing c &&
+	cat sparse_error_header >expect &&
+	echo c >>expect &&
+	cat sparse_hint >>expect &&
+	test_cmp expect stderr &&
+	git mv --sparse a c 2>stderr &&
+	test_must_be_empty stderr &&
+	test_path_is_missing a &&
+	test_path_exists c
+'
+
+test_expect_success 'mv refuses to move sparse-to-non-sparse' '
+	test_when_finished rm -f b c e &&
+	git reset --hard &&
+	git sparse-checkout set a e &&
+
+	# tracked-to-untracked
+	touch b &&
+	test_must_fail git mv b e 2>stderr &&
+	cat sparse_error_header >expect &&
+	echo b >>expect &&
+	cat sparse_hint >>expect &&
+	test_cmp expect stderr &&
+	git mv --sparse b e 2>stderr &&
+	test_must_be_empty stderr
+'
+
+test_expect_success 'recursive mv refuses to move (possible) sparse' '
+	test_when_finished rm -rf b c e sub2 &&
+	git reset --hard &&
+	# Without cone mode, "sub" and "sub2" do not match
+	git sparse-checkout set sub/dir sub2/dir &&
+
+	# Add contained contents to ensure we avoid non-existence errors
+	mkdir sub/dir2 &&
+	touch sub/d sub/dir2/e &&
+
+	test_must_fail git mv sub sub2 2>stderr &&
+	cat sparse_error_header >expect &&
+	cat >>expect <<-\EOF &&
+	sub/d
+	sub2/d
+	sub/dir2/e
+	sub2/dir2/e
+	EOF
+	cat sparse_hint >>expect &&
+	test_cmp expect stderr &&
+	git mv --sparse sub sub2 2>stderr &&
+	test_must_be_empty stderr &&
+	git commit -m "moved sub to sub2" &&
+	git rev-parse HEAD~1:sub >expect &&
+	git rev-parse HEAD:sub2 >actual &&
+	test_cmp expect actual &&
+	git reset --hard HEAD~1
+'
+
+test_expect_success 'recursive mv refuses to move sparse' '
+	git reset --hard &&
+	# Use cone mode so "sub/" matches the sparse-checkout patterns
+	git sparse-checkout init --cone &&
+	git sparse-checkout set sub/dir sub2/dir &&
+
+	# Add contained contents to ensure we avoid non-existence errors
+	mkdir sub/dir2 &&
+	touch sub/dir2/e &&
+
+	test_must_fail git mv sub sub2 2>stderr &&
+	cat sparse_error_header >expect &&
+	cat >>expect <<-\EOF &&
+	sub/dir2/e
+	sub2/dir2/e
+	EOF
+	cat sparse_hint >>expect &&
+	test_cmp expect stderr &&
+	git mv --sparse sub sub2 2>stderr &&
+	test_must_be_empty stderr &&
+	git commit -m "moved sub to sub2" &&
+	git rev-parse HEAD~1:sub >expect &&
+	git rev-parse HEAD:sub2 >actual &&
+	test_cmp expect actual &&
+	git reset --hard HEAD~1
+'
+
+test_expect_success 'can move files to non-sparse dir' '
+	git reset --hard &&
+	git sparse-checkout init --no-cone &&
+	git sparse-checkout set a b c w !/x y/ &&
+	mkdir -p w x/y &&
+
+	git mv a w/new-a 2>stderr &&
+	git mv b x/y/new-b 2>stderr &&
+	test_must_be_empty stderr
+'
+
+test_expect_success 'refuse to move file to non-skip-worktree sparse path' '
+	test_when_finished "cleanup_sparse_checkout" &&
+	git reset --hard &&
+	git sparse-checkout init --no-cone &&
+	git sparse-checkout set a !/x y/ !x/y/z &&
+	mkdir -p x/y/z &&
+
+	test_must_fail git mv a x/y/z/new-a 2>stderr &&
+	echo x/y/z/new-a | cat sparse_error_header - sparse_hint >expect &&
+	test_cmp expect stderr
+'
+
+test_expect_success 'refuse to move out-of-cone directory without --sparse' '
+	test_when_finished "cleanup_sparse_checkout" &&
+	setup_sparse_checkout &&
+
+	test_must_fail git mv folder1 sub 2>stderr &&
+	cat sparse_error_header >expect &&
+	echo folder1/file1 >>expect &&
+	cat sparse_hint >>expect &&
+	test_cmp expect stderr
+'
+
+test_expect_success 'can move out-of-cone directory with --sparse' '
+	test_when_finished "cleanup_sparse_checkout" &&
+	setup_sparse_checkout &&
+
+	git mv --sparse folder1 sub 2>stderr &&
+	test_must_be_empty stderr &&
+
+	test_path_is_dir sub/folder1 &&
+	test_path_is_file sub/folder1/file1
+'
+
+test_expect_success 'refuse to move out-of-cone file without --sparse' '
+	test_when_finished "cleanup_sparse_checkout" &&
+	setup_sparse_checkout &&
+
+	test_must_fail git mv folder1/file1 sub 2>stderr &&
+	cat sparse_error_header >expect &&
+	echo folder1/file1 >>expect &&
+	cat sparse_hint >>expect &&
+	test_cmp expect stderr
+'
+
+test_expect_success 'can move out-of-cone file with --sparse' '
+	test_when_finished "cleanup_sparse_checkout" &&
+	setup_sparse_checkout &&
+
+	git mv --sparse folder1/file1 sub 2>stderr &&
+	test_must_be_empty stderr &&
+
+	test_path_is_file sub/file1
+'
+
+test_expect_success 'refuse to move sparse file to existing destination' '
+	test_when_finished "cleanup_sparse_checkout" &&
+	mkdir folder1 &&
+	touch folder1/file1 &&
+	touch sub/file1 &&
+	git add folder1 sub/file1 &&
+	git sparse-checkout set --cone sub &&
+
+	test_must_fail git mv --sparse folder1/file1 sub 2>stderr &&
+	echo "fatal: destination exists, source=folder1/file1, destination=sub/file1" >expect &&
+	test_cmp expect stderr
+'
+
+test_expect_success 'move sparse file to existing destination with --force and --sparse' '
+	test_when_finished "cleanup_sparse_checkout" &&
+	mkdir folder1 &&
+	touch folder1/file1 &&
+	touch sub/file1 &&
+	echo "overwrite" >folder1/file1 &&
+	git add folder1 sub/file1 &&
+	git sparse-checkout set --cone sub &&
+
+	git mv --sparse --force folder1/file1 sub 2>stderr &&
+	test_must_be_empty stderr &&
+	echo "overwrite" >expect &&
+	test_cmp expect sub/file1
+'
+
+test_expect_success 'move clean path from in-cone to out-of-cone' '
+	test_when_finished "cleanup_sparse_checkout" &&
+	setup_sparse_checkout &&
+
+	test_must_fail git mv sub/d folder1 2>stderr &&
+	cat sparse_error_header >expect &&
+	echo "folder1/d" >>expect &&
+	cat sparse_hint >>expect &&
+	test_cmp expect stderr &&
+
+	git mv --sparse sub/d folder1 2>stderr &&
+	test_must_be_empty stderr &&
+
+	test_path_is_missing sub/d &&
+	test_path_is_missing folder1/d &&
+	git ls-files -t >actual &&
+	! grep "^H sub/d\$" actual &&
+	grep "S folder1/d" actual
+'
+
+test_expect_success 'move clean path from in-cone to out-of-cone overwrite' '
+	test_when_finished "cleanup_sparse_checkout" &&
+	setup_sparse_checkout &&
+	echo "sub/file1 overwrite" >sub/file1 &&
+	git add sub/file1 &&
+
+	test_must_fail git mv sub/file1 folder1 2>stderr &&
+	cat sparse_error_header >expect &&
+	echo "folder1/file1" >>expect &&
+	cat sparse_hint >>expect &&
+	test_cmp expect stderr &&
+
+	test_must_fail git mv --sparse sub/file1 folder1 2>stderr &&
+	echo "fatal: destination exists in the index, source=sub/file1, destination=folder1/file1" \
+	>expect &&
+	test_cmp expect stderr &&
+
+	git mv --sparse -f sub/file1 folder1 2>stderr &&
+	test_must_be_empty stderr &&
+
+	test_path_is_missing sub/file1 &&
+	test_path_is_missing folder1/file1 &&
+	git ls-files -t >actual &&
+	! grep "H sub/file1" actual &&
+	grep "S folder1/file1" actual &&
+
+	# compare file content before move and after move
+	echo "sub/file1 overwrite" >expect &&
+	git ls-files -s -- folder1/file1 | awk "{print \$2}" >oid &&
+	git cat-file blob $(cat oid) >actual &&
+	test_cmp expect actual
+'
+
+# This test is testing the same behavior as the
+# "move clean path from in-cone to out-of-cone overwrite" above.
+# The only difference is the <destination> changes from "folder1" to "folder1/file1"
+test_expect_success 'move clean path from in-cone to out-of-cone file overwrite' '
+	test_when_finished "cleanup_sparse_checkout" &&
+	setup_sparse_checkout &&
+	echo "sub/file1 overwrite" >sub/file1 &&
+	git add sub/file1 &&
+
+	test_must_fail git mv sub/file1 folder1/file1 2>stderr &&
+	cat sparse_error_header >expect &&
+	echo "folder1/file1" >>expect &&
+	cat sparse_hint >>expect &&
+	test_cmp expect stderr &&
+
+	test_must_fail git mv --sparse sub/file1 folder1/file1 2>stderr &&
+	echo "fatal: destination exists in the index, source=sub/file1, destination=folder1/file1" \
+	>expect &&
+	test_cmp expect stderr &&
+
+	git mv --sparse -f sub/file1 folder1/file1 2>stderr &&
+	test_must_be_empty stderr &&
+
+	test_path_is_missing sub/file1 &&
+	test_path_is_missing folder1/file1 &&
+	git ls-files -t >actual &&
+	! grep "H sub/file1" actual &&
+	grep "S folder1/file1" actual &&
+
+	# compare file content before move and after move
+	echo "sub/file1 overwrite" >expect &&
+	git ls-files -s -- folder1/file1 | awk "{print \$2}" >oid &&
+	git cat-file blob $(cat oid) >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'move directory with one of the files overwrite' '
+	test_when_finished "cleanup_sparse_checkout" &&
+	mkdir -p folder1/dir &&
+	touch folder1/dir/file1 &&
+	git add folder1 &&
+	git sparse-checkout set --cone sub &&
+
+	echo test >sub/dir/file1 &&
+	git add sub/dir/file1 &&
+
+	test_must_fail git mv sub/dir folder1 2>stderr &&
+	cat sparse_error_header >expect &&
+	echo "folder1/dir/e" >>expect &&
+	echo "folder1/dir/file1" >>expect &&
+	cat sparse_hint >>expect &&
+	test_cmp expect stderr &&
+
+	test_must_fail git mv --sparse sub/dir folder1 2>stderr &&
+	echo "fatal: destination exists in the index, source=sub/dir/file1, destination=folder1/dir/file1" \
+	>expect &&
+	test_cmp expect stderr &&
+
+	git mv --sparse -f sub/dir folder1 2>stderr &&
+	test_must_be_empty stderr &&
+
+	test_path_is_missing sub/dir/file1 &&
+	test_path_is_missing sub/dir/e &&
+	test_path_is_missing folder1/file1 &&
+	git ls-files -t >actual &&
+	! grep "H sub/dir/file1" actual &&
+	! grep "H sub/dir/e" actual &&
+	grep "S folder1/dir/file1" actual &&
+
+	# compare file content before move and after move
+	echo test >expect &&
+	git ls-files -s -- folder1/dir/file1 | awk "{print \$2}" >oid &&
+	git cat-file blob $(cat oid) >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'move dirty path from in-cone to out-of-cone' '
+	test_when_finished "cleanup_sparse_checkout" &&
+	setup_sparse_checkout &&
+	echo "modified" >>sub/d &&
+
+	test_must_fail git mv sub/d folder1 2>stderr &&
+	cat sparse_error_header >expect &&
+	echo "folder1/d" >>expect &&
+	cat sparse_hint >>expect &&
+	test_cmp expect stderr &&
+
+	git mv --sparse sub/d folder1 2>stderr &&
+	cat dirty_error_header >expect &&
+	echo "folder1/d" >>expect &&
+	cat dirty_hint >>expect &&
+	test_cmp expect stderr &&
+
+	test_path_is_missing sub/d &&
+	test_path_is_file folder1/d &&
+	git ls-files -t >actual &&
+	! grep "^H sub/d\$" actual &&
+	grep "H folder1/d" actual
+'
+
+test_expect_success 'move dir from in-cone to out-of-cone' '
+	test_when_finished "cleanup_sparse_checkout" &&
+	setup_sparse_checkout &&
+	mkdir sub/dir/deep &&
+
+	test_must_fail git mv sub/dir folder1 2>stderr &&
+	cat sparse_error_header >expect &&
+	echo "folder1/dir/e" >>expect &&
+	cat sparse_hint >>expect &&
+	test_cmp expect stderr &&
+
+	git mv --sparse sub/dir folder1 2>stderr &&
+	test_must_be_empty stderr &&
+
+	test_path_is_missing sub/dir &&
+	test_path_is_missing folder1 &&
+	git ls-files -t >actual &&
+	! grep "H sub/dir/e" actual &&
+	grep "S folder1/dir/e" actual
+'
+
+test_expect_success 'move partially-dirty dir from in-cone to out-of-cone' '
+	test_when_finished "cleanup_sparse_checkout" &&
+	setup_sparse_checkout &&
+	mkdir sub/dir/deep &&
+	touch sub/dir/e2 sub/dir/e3 &&
+	git add sub/dir/e2 sub/dir/e3 &&
+	echo "modified" >>sub/dir/e2 &&
+	echo "modified" >>sub/dir/e3 &&
+
+	test_must_fail git mv sub/dir folder1 2>stderr &&
+	cat sparse_error_header >expect &&
+	echo "folder1/dir/e" >>expect &&
+	echo "folder1/dir/e2" >>expect &&
+	echo "folder1/dir/e3" >>expect &&
+	cat sparse_hint >>expect &&
+	test_cmp expect stderr &&
+
+	git mv --sparse sub/dir folder1 2>stderr &&
+	cat dirty_error_header >expect &&
+	echo "folder1/dir/e2" >>expect &&
+	echo "folder1/dir/e3" >>expect &&
+	cat dirty_hint >>expect &&
+	test_cmp expect stderr &&
+
+	test_path_is_missing sub/dir &&
+	test_path_is_missing folder1/dir/e &&
+	test_path_is_file folder1/dir/e2 &&
+	test_path_is_file folder1/dir/e3 &&
+	git ls-files -t >actual &&
+	! grep "H sub/dir/e" actual &&
+	! grep "H sub/dir/e2" actual &&
+	! grep "H sub/dir/e3" actual &&
+	grep "S folder1/dir/e" actual &&
+	grep "H folder1/dir/e2" actual &&
+	grep "H folder1/dir/e3" actual
+'
+
+test_done
diff --git a/t/t7003-filter-branch.sh b/t/t7003-filter-branch.sh
index 36477cb..5ab4d41 100755
--- a/t/t7003-filter-branch.sh
+++ b/t/t7003-filter-branch.sh
@@ -1,6 +1,9 @@
 #!/bin/sh
 
 test_description='git filter-branch'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 . "$TEST_DIRECTORY/lib-gpg.sh"
 
@@ -13,7 +16,7 @@ test_expect_success 'setup' '
 	mkdir dir &&
 	test_commit dir/D &&
 	test_commit E &&
-	git checkout master &&
+	git checkout main &&
 	test_commit C &&
 	git checkout branch &&
 	git merge C &&
@@ -25,7 +28,7 @@ test_expect_success 'setup' '
 # * G
 # *   Merge commit 'C' into branch
 # |\
-# | * (master) C
+# | * (main) C
 # * | E
 # * | dir/D
 # * | D
@@ -46,7 +49,7 @@ test_expect_success 'result is really identical' '
 test_expect_success 'rewrite bare repository identically' '
 	(git config core.bare true && cd .git &&
 	 git filter-branch branch > filter-output 2>&1 &&
-	! fgrep fatal filter-output)
+	! grep fatal filter-output)
 '
 git config core.bare false
 test_expect_success 'result is really identical' '
@@ -162,15 +165,15 @@ test_expect_success 'subdirectory filter result looks okay' '
 '
 
 test_expect_success 'more setup' '
-	git checkout master &&
+	git checkout main &&
 	mkdir subdir &&
 	echo A > subdir/new &&
 	git add subdir/new &&
 	test_tick &&
-	git commit -m "subdir on master" subdir/new &&
+	git commit -m "subdir on main" subdir/new &&
 	git rm A.t &&
 	test_tick &&
-	git commit -m "again subdir on master" &&
+	git commit -m "again subdir on main" &&
 	git merge branch
 '
 
@@ -199,7 +202,7 @@ test_expect_success 'author information is preserved' '
 	git branch preserved-author &&
 	(sane_unset GIT_AUTHOR_NAME &&
 	 git filter-branch -f --msg-filter "cat; \
-			test \$GIT_COMMIT != $(git rev-parse master) || \
+			test \$GIT_COMMIT != $(git rev-parse main) || \
 			echo Hallo" \
 		preserved-author) &&
 	git rev-list --author="B V Uips" preserved-author >actual &&
@@ -218,7 +221,7 @@ test_expect_success "remove a certain author's commits" '
 		else\
 			git commit-tree \"\$@\";\
 		fi" removed-author &&
-	cnt1=$(git rev-list master | wc -l) &&
+	cnt1=$(git rev-list main | wc -l) &&
 	cnt2=$(git rev-list removed-author | wc -l) &&
 	test $cnt1 -eq $(($cnt2 + 1)) &&
 	git rev-list --author="B V Uips" removed-author >actual &&
@@ -226,7 +229,7 @@ test_expect_success "remove a certain author's commits" '
 '
 
 test_expect_success 'barf on invalid name' '
-	test_must_fail git filter-branch -f master xy-problem &&
+	test_must_fail git filter-branch -f main xy-problem &&
 	test_must_fail git filter-branch -f HEAD^
 '
 
@@ -236,8 +239,8 @@ test_expect_success '"map" works in commit filter' '
 		mapped=\$(map \$parent) &&
 		actual=\$(echo \"\$@\" | sed \"s/^.*-p //\") &&
 		test \$mapped = \$actual &&
-		git commit-tree \"\$@\";" master~2..master &&
-	git rev-parse --verify master
+		git commit-tree \"\$@\";" main~2..main &&
+	git rev-parse --verify main
 '
 
 test_expect_success 'Name needing quotes' '
@@ -256,7 +259,7 @@ test_expect_success 'Name needing quotes' '
 
 test_expect_success 'Subdirectory filter with disappearing trees' '
 	git reset --hard &&
-	git checkout master &&
+	git checkout main &&
 
 	mkdir foo &&
 	touch foo/bar &&
@@ -275,7 +278,7 @@ test_expect_success 'Subdirectory filter with disappearing trees' '
 	git commit -m "Re-adding foo" &&
 
 	git filter-branch -f --subdirectory-filter foo &&
-	git rev-list master >actual &&
+	git rev-list main >actual &&
 	test_line_count = 3 actual
 '
 
@@ -332,7 +335,7 @@ test_expect_success 'Tag name filtering allows slashes in tag names' '
 	test_cmp expect actual
 '
 test_expect_success 'setup --prune-empty comparisons' '
-	git checkout --orphan master-no-a &&
+	git checkout --orphan main-no-a &&
 	git rm -rf . &&
 	unset test_tick &&
 	test_tick &&
@@ -343,7 +346,7 @@ test_expect_success 'setup --prune-empty comparisons' '
 	mkdir dir &&
 	test_commit dir/D dir/D.t dir/D dir/Dx &&
 	test_commit E E.t E Ex &&
-	git checkout master-no-a &&
+	git checkout main-no-a &&
 	test_commit C C.t C Cx &&
 	git checkout branch-no-a &&
 	git merge Cx -m "Merge tag '\''C'\'' into branch" &&
@@ -392,12 +395,12 @@ test_expect_success '--prune-empty is able to prune root commit' '
 test_expect_success '--prune-empty is able to prune entire branch' '
 	git branch prune-entire B &&
 	git filter-branch -f --prune-empty --index-filter "git update-index --remove A.t B.t" prune-entire &&
-	test_path_is_missing .git/refs/heads/prune-entire &&
+	test_must_fail git rev-parse refs/heads/prune-entire &&
 	test_must_fail git reflog exists refs/heads/prune-entire
 '
 
 test_expect_success '--remap-to-ancestor with filename filters' '
-	git checkout master &&
+	git checkout main &&
 	git reset --hard A &&
 	test_commit add-foo foo 1 &&
 	git branch moved-foo &&
@@ -407,15 +410,15 @@ test_expect_success '--remap-to-ancestor with filename filters' '
 	git branch moved-bar &&
 	test_commit change-foo foo 2 &&
 	git filter-branch -f --remap-to-ancestor \
-		moved-foo moved-bar A..master \
+		moved-foo moved-bar A..main \
 		-- -- foo &&
 	test $(git rev-parse moved-foo) = $(git rev-parse moved-bar) &&
-	test $(git rev-parse moved-foo) = $(git rev-parse master^) &&
+	test $(git rev-parse moved-foo) = $(git rev-parse main^) &&
 	test $orig_invariant = $(git rev-parse invariant)
 '
 
 test_expect_success 'automatic remapping to ancestor with filename filters' '
-	git checkout master &&
+	git checkout main &&
 	git reset --hard A &&
 	test_commit add-foo2 foo 1 &&
 	git branch moved-foo2 &&
@@ -425,10 +428,10 @@ test_expect_success 'automatic remapping to ancestor with filename filters' '
 	git branch moved-bar2 &&
 	test_commit change-foo2 foo 2 &&
 	git filter-branch -f \
-		moved-foo2 moved-bar2 A..master \
+		moved-foo2 moved-bar2 A..main \
 		-- -- foo &&
 	test $(git rev-parse moved-foo2) = $(git rev-parse moved-bar2) &&
-	test $(git rev-parse moved-foo2) = $(git rev-parse master^) &&
+	test $(git rev-parse moved-foo2) = $(git rev-parse main^) &&
 	test $orig_invariant = $(git rev-parse invariant2)
 '
 
@@ -500,7 +503,38 @@ test_expect_success 'rewrite repository including refs that point at non-commit
 	git tag -a -m "tag to a tree" treetag $new_tree &&
 	git reset --hard HEAD &&
 	git filter-branch -f -- --all >filter-output 2>&1 &&
-	! fgrep fatal filter-output
+	! grep fatal filter-output
+'
+
+test_expect_success 'filter-branch handles ref deletion' '
+	git switch --orphan empty-commit &&
+	git commit --allow-empty -m "empty commit" &&
+	git tag empty &&
+	git branch to-delete &&
+	git filter-branch -f --prune-empty to-delete >out 2>&1 &&
+	grep "to-delete.*was deleted" out &&
+	test_must_fail git rev-parse --verify to-delete
+'
+
+test_expect_success 'filter-branch handles ref rewrite' '
+	git checkout empty &&
+	test_commit to-drop &&
+	git branch rewrite &&
+	git filter-branch -f \
+		--index-filter "git rm --ignore-unmatch --cached to-drop.t" \
+		 rewrite >out 2>&1 &&
+	grep "rewrite.*was rewritten" out &&
+	! grep -i warning out &&
+	git diff-tree empty rewrite
+'
+
+test_expect_success 'filter-branch handles ancestor rewrite' '
+	test_commit to-exclude &&
+	git branch ancestor &&
+	git filter-branch -f ancestor -- :^to-exclude.t >out 2>&1 &&
+	grep "ancestor.*was rewritten" out &&
+	! grep -i warning out &&
+	git diff-tree HEAD^ ancestor
 '
 
 test_done
diff --git a/t/t7004-tag.sh b/t/t7004-tag.sh
index 74b637d..696866d 100755
--- a/t/t7004-tag.sh
+++ b/t/t7004-tag.sh
@@ -7,6 +7,9 @@ test_description='git tag
 
 Tests for operations with tags.'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-gpg.sh
 . "$TEST_DIRECTORY"/lib-terminal.sh
@@ -17,6 +20,13 @@ tag_exists () {
 	git show-ref --quiet --verify refs/tags/"$1"
 }
 
+test_expect_success 'setup' '
+	test_oid_cache <<-EOM
+	othersigheader sha1:gpgsig-sha256
+	othersigheader sha256:gpgsig
+	EOM
+'
+
 test_expect_success 'listing all tags in an empty tree should succeed' '
 	git tag -l &&
 	git tag
@@ -84,22 +94,22 @@ test_expect_success 'creating a tag with --create-reflog should create reflog' '
 	git log -1 \
 		--format="format:tag: tagging %h (%s, %cd)%n" \
 		--date=format:%Y-%m-%d >expected &&
-	test_when_finished "git tag -d tag_with_reflog" &&
-	git tag --create-reflog tag_with_reflog &&
-	git reflog exists refs/tags/tag_with_reflog &&
-	sed -e "s/^.*	//" .git/logs/refs/tags/tag_with_reflog >actual &&
-	test_i18ncmp expected actual
+	test_when_finished "git tag -d tag_with_reflog1" &&
+	git tag --create-reflog tag_with_reflog1 &&
+	git reflog exists refs/tags/tag_with_reflog1 &&
+	test-tool ref-store main for-each-reflog-ent refs/tags/tag_with_reflog1 | sed -e "s/^.*	//" >actual &&
+	test_cmp expected actual
 '
 
 test_expect_success 'annotated tag with --create-reflog has correct message' '
 	git log -1 \
 		--format="format:tag: tagging %h (%s, %cd)%n" \
 		--date=format:%Y-%m-%d >expected &&
-	test_when_finished "git tag -d tag_with_reflog" &&
-	git tag -m "annotated tag" --create-reflog tag_with_reflog &&
-	git reflog exists refs/tags/tag_with_reflog &&
-	sed -e "s/^.*	//" .git/logs/refs/tags/tag_with_reflog >actual &&
-	test_i18ncmp expected actual
+	test_when_finished "git tag -d tag_with_reflog2" &&
+	git tag -m "annotated tag" --create-reflog tag_with_reflog2 &&
+	git reflog exists refs/tags/tag_with_reflog2 &&
+	test-tool ref-store main for-each-reflog-ent refs/tags/tag_with_reflog2 | sed -e "s/^.*	//" >actual &&
+	test_cmp expected actual
 '
 
 test_expect_success '--create-reflog does not create reflog on failure' '
@@ -108,10 +118,10 @@ test_expect_success '--create-reflog does not create reflog on failure' '
 '
 
 test_expect_success 'option core.logAllRefUpdates=always creates reflog' '
-	test_when_finished "git tag -d tag_with_reflog" &&
+	test_when_finished "git tag -d tag_with_reflog3" &&
 	test_config core.logAllRefUpdates always &&
-	git tag tag_with_reflog &&
-	git reflog exists refs/tags/tag_with_reflog
+	git tag tag_with_reflog3 &&
+	git reflog exists refs/tags/tag_with_reflog3
 '
 
 test_expect_success 'listing all tags if one exists should succeed' '
@@ -782,6 +792,34 @@ test_expect_success 'annotations for blobs are empty' '
 	test_cmp expect actual
 '
 
+# Run this before doing any signing, so the test has the same results
+# regardless of the GPG prereq.
+test_expect_success 'git tag --format with ahead-behind' '
+	test_when_finished git reset --hard tag-one-line &&
+	git commit --allow-empty -m "left" &&
+	git tag -a -m left tag-left &&
+	git reset --hard HEAD~1 &&
+	git commit --allow-empty -m "right" &&
+	git tag -a -m left tag-right &&
+
+	# Use " !" at the end to demonstrate whitespace
+	# around empty ahead-behind token for tag-blob.
+	cat >expect <<-EOF &&
+	refs/tags/tag-blob  !
+	refs/tags/tag-left 1 1 !
+	refs/tags/tag-lines 0 1 !
+	refs/tags/tag-one-line 0 1 !
+	refs/tags/tag-right 0 0 !
+	refs/tags/tag-zero-lines 0 1 !
+	EOF
+	git tag -l --format="%(refname) %(ahead-behind:HEAD) !" >actual 2>err &&
+	grep "refs/tags/tag" actual >actual.focus &&
+	test_cmp expect actual.focus &&
+
+	# Error reported for tags that point to non-commits.
+	grep "error: object [0-9a-f]* is a blob, not a commit" err
+'
+
 # trying to verify annotated non-signed tags:
 
 test_expect_success GPG \
@@ -1371,6 +1409,24 @@ test_expect_success GPG \
 	'test_config gpg.program echo &&
 	 test_must_fail git tag -s -m tail tag-gpg-failure'
 
+# try to produce invalid signature
+test_expect_success GPG 'git verifies tag is valid with double signature' '
+	git tag -s -m tail tag-gpg-double-sig &&
+	git cat-file tag tag-gpg-double-sig >tag &&
+	othersigheader=$(test_oid othersigheader) &&
+	sed -ne "/^\$/q;p" tag >new-tag &&
+	cat <<-EOM >>new-tag &&
+	$othersigheader -----BEGIN PGP SIGNATURE-----
+	 someinvaliddata
+	 -----END PGP SIGNATURE-----
+	EOM
+	sed -e "1,/^tagger/d" tag >>new-tag &&
+	new_tag=$(git hash-object -t tag -w new-tag) &&
+	git update-ref refs/tags/tag-gpg-double-sig $new_tag &&
+	git verify-tag tag-gpg-double-sig &&
+	git fsck
+'
+
 # try to sign with bad user.signingkey
 test_expect_success GPGSM \
 	'git tag -s fails if gpgsm is misconfigured (bad key)' \
@@ -1406,7 +1462,7 @@ test_expect_success 'message in editor has initial comment: first line' '
 	# check the first line --- should be empty
 	echo >first.expect &&
 	sed -e 1q <actual >first.actual &&
-	test_i18ncmp first.expect first.actual
+	test_cmp first.expect first.actual
 '
 
 test_expect_success \
@@ -1583,7 +1639,7 @@ test_expect_success 'checking that branch head with --no-contains lists all but
 "
 
 test_expect_success 'merging original branch into this branch' '
-	git merge --strategy=ours master &&
+	git merge --strategy=ours main &&
         git tag v4.0
 '
 
@@ -1721,15 +1777,15 @@ test_expect_success '--points-at finds annotated tags of tags' '
 '
 
 test_expect_success 'recursive tagging should give advice' '
-	sed -e "s/|$//" <<-EOF >expect &&
+	cat >expect <<-EOF &&
 	hint: You have created a nested tag. The object referred to by your new tag is
 	hint: already a tag. If you meant to tag the object that it points to, use:
-	hint: |
+	hint:
 	hint: 	git tag -f nested annotated-v4.0^{}
 	hint: Disable this message with "git config advice.nestedTag false"
 	EOF
 	git tag -m nested nested annotated-v4.0 2>actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 test_expect_success 'multiple --points-at are OR-ed together' '
@@ -1806,6 +1862,51 @@ test_expect_success 'option override configured sort' '
 	test_cmp expect actual
 '
 
+test_expect_success '--no-sort cancels config sort keys' '
+	test_config tag.sort "-refname" &&
+
+	# objecttype is identical for all of them, so sort falls back on
+	# default (ascending refname)
+	git tag -l \
+		--no-sort \
+		--sort="objecttype" \
+		"foo*" >actual &&
+	cat >expect <<-\EOF &&
+	foo1.10
+	foo1.3
+	foo1.6
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success '--no-sort cancels command line sort keys' '
+	# objecttype is identical for all of them, so sort falls back on
+	# default (ascending refname)
+	git tag -l \
+		--sort="-refname" \
+		--no-sort \
+		--sort="objecttype" \
+		"foo*" >actual &&
+	cat >expect <<-\EOF &&
+	foo1.10
+	foo1.3
+	foo1.6
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success '--no-sort without subsequent --sort prints expected tags' '
+	# Sort the results with `sort` for a consistent comparison against
+	# expected
+	git tag -l --no-sort "foo*" | sort >actual &&
+	cat >expect <<-\EOF &&
+	foo1.10
+	foo1.3
+	foo1.6
+	EOF
+	test_cmp expect actual
+'
+
 test_expect_success 'invalid sort parameter on command line' '
 	test_must_fail git tag -l --sort=notvalid "foo*" >actual
 '
@@ -1815,6 +1916,23 @@ test_expect_success 'invalid sort parameter in configuratoin' '
 	test_must_fail git tag -l "foo*"
 '
 
+test_expect_success 'version sort handles empty value for versionsort.{prereleaseSuffix,suffix}' '
+	cp .git/config .git/config.orig &&
+	test_when_finished mv .git/config.orig .git/config &&
+
+	cat >>.git/config <<-\EOF &&
+	[versionsort]
+		prereleaseSuffix
+		suffix
+	EOF
+	cat >expect <<-\EOF &&
+	error: missing value for '\''versionsort.suffix'\''
+	error: missing value for '\''versionsort.prereleasesuffix'\''
+	EOF
+	git tag -l --sort=version:refname 2>actual &&
+	test_cmp expect actual
+'
+
 test_expect_success 'version sort with prerelease reordering' '
 	test_config versionsort.prereleaseSuffix -rc &&
 	git tag foo1.6-rc1 &&
@@ -1944,15 +2062,18 @@ test_expect_success ULIMIT_STACK_SIZE '--contains and --no-contains work in a de
 	i=1 &&
 	while test $i -lt 8000
 	do
-		echo "commit refs/heads/master
+		echo "commit refs/heads/main
 committer A U Thor <author@example.com> $((1000000000 + $i * 100)) +0200
 data <<EOF
 commit #$i
-EOF"
-		test $i = 1 && echo "from refs/heads/master^0"
-		i=$(($i + 1))
+EOF" &&
+		if test $i = 1
+		then
+			echo "from refs/heads/main^0"
+		fi &&
+		i=$(($i + 1)) || return 1
 	done | git fast-import &&
-	git checkout master &&
+	git checkout main &&
 	git tag far-far-away HEAD^ &&
 	run_with_limited_stack git tag --contains HEAD >actual &&
 	test_must_be_empty actual &&
@@ -1970,6 +2091,26 @@ test_expect_success '--format should list tags as per format given' '
 	test_cmp expect actual
 '
 
+test_expect_success '--format --omit-empty works' '
+	cat >expect <<-\EOF &&
+	refname : refs/tags/v1.0
+
+	refname : refs/tags/v1.1.3
+	EOF
+	git tag -l --format="%(if:notequals=refs/tags/v1.0.1)%(refname)%(then)refname : %(refname)%(end)" "v1*" >actual &&
+	test_cmp expect actual &&
+	cat >expect <<-\EOF &&
+	refname : refs/tags/v1.0
+	refname : refs/tags/v1.1.3
+	EOF
+	git tag -l --omit-empty --format="%(if:notequals=refs/tags/v1.0.1)%(refname)%(then)refname : %(refname)%(end)" "v1*" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'git tag -l with --format="%(rest)" must fail' '
+	test_must_fail git tag -l --format="%(rest)" "v1*"
+'
+
 test_expect_success "set up color tests" '
 	echo "<RED>v1.0<RESET>" >expect.color &&
 	echo "v1.0" >expect.bare &&
@@ -2015,8 +2156,8 @@ test_expect_success '--merged can be used in non-list mode' '
 	test_cmp expect actual
 '
 
-test_expect_success '--merged is incompatible with --no-merged' '
-	test_must_fail git tag --merged HEAD --no-merged HEAD
+test_expect_success '--merged is compatible with --no-merged' '
+	git tag --merged HEAD --no-merged HEAD
 '
 
 test_expect_success '--merged shows merged tags' '
@@ -2092,4 +2233,23 @@ test_expect_success 'Does --[no-]contains stop at commits? Yes!' '
 	test_cmp expected actual
 '
 
+test_expect_success 'If tag is created then tag message file is unlinked' '
+	test_when_finished "git tag -d foo" &&
+	write_script fakeeditor <<-\EOF &&
+	echo Message >.git/TAG_EDITMSG
+	EOF
+	GIT_EDITOR=./fakeeditor git tag -a foo &&
+	test_path_is_missing .git/TAG_EDITMSG
+'
+
+test_expect_success 'If tag cannot be created then tag message file is not unlinked' '
+	test_when_finished "git tag -d foo/bar && rm .git/TAG_EDITMSG" &&
+	write_script fakeeditor <<-\EOF &&
+	echo Message >.git/TAG_EDITMSG
+	EOF
+	git tag foo/bar &&
+	test_must_fail env GIT_EDITOR=./fakeeditor git tag -a foo &&
+	test_path_exists .git/TAG_EDITMSG
+'
+
 test_done
diff --git a/t/t7006-pager.sh b/t/t7006-pager.sh
index 00e09a3..e56ca5b 100755
--- a/t/t7006-pager.sh
+++ b/t/t7006-pager.sh
@@ -19,7 +19,7 @@ test_expect_success 'setup' '
 test_expect_success TTY 'some commands use a pager' '
 	rm -f paginated.out &&
 	test_terminal git log &&
-	test -e paginated.out
+	test_path_is_file paginated.out
 '
 
 test_expect_failure TTY 'pager runs from subdir' '
@@ -65,49 +65,49 @@ test_expect_success !MINGW,TTY 'LESS and LV envvars set by git-sh-setup' '
 test_expect_success TTY 'some commands do not use a pager' '
 	rm -f paginated.out &&
 	test_terminal git rev-list HEAD &&
-	! test -e paginated.out
+	test_path_is_missing paginated.out
 '
 
 test_expect_success 'no pager when stdout is a pipe' '
 	rm -f paginated.out &&
 	git log | cat &&
-	! test -e paginated.out
+	test_path_is_missing paginated.out
 '
 
 test_expect_success 'no pager when stdout is a regular file' '
 	rm -f paginated.out &&
 	git log >file &&
-	! test -e paginated.out
+	test_path_is_missing paginated.out
 '
 
 test_expect_success TTY 'git --paginate rev-list uses a pager' '
 	rm -f paginated.out &&
 	test_terminal git --paginate rev-list HEAD &&
-	test -e paginated.out
+	test_path_is_file paginated.out
 '
 
 test_expect_success 'no pager even with --paginate when stdout is a pipe' '
 	rm -f file paginated.out &&
 	git --paginate log | cat &&
-	! test -e paginated.out
+	test_path_is_missing paginated.out
 '
 
 test_expect_success TTY 'no pager with --no-pager' '
 	rm -f paginated.out &&
 	test_terminal git --no-pager log &&
-	! test -e paginated.out
+	test_path_is_missing paginated.out
 '
 
 test_expect_success TTY 'configuration can disable pager' '
 	rm -f paginated.out &&
 	test_unconfig pager.grep &&
 	test_terminal git grep initial &&
-	test -e paginated.out &&
+	test_path_is_file paginated.out &&
 
 	rm -f paginated.out &&
 	test_config pager.grep false &&
 	test_terminal git grep initial &&
-	! test -e paginated.out
+	test_path_is_missing paginated.out
 '
 
 test_expect_success TTY 'configuration can enable pager (from subdir)' '
@@ -122,107 +122,107 @@ test_expect_success TTY 'configuration can enable pager (from subdir)' '
 		test_terminal git bundle unbundle ../test.bundle
 	) &&
 	{
-		test -e paginated.out ||
-		test -e subdir/paginated.out
+		test_path_is_file paginated.out ||
+		test_path_is_file subdir/paginated.out
 	}
 '
 
 test_expect_success TTY 'git tag -l defaults to paging' '
 	rm -f paginated.out &&
 	test_terminal git tag -l &&
-	test -e paginated.out
+	test_path_is_file paginated.out
 '
 
 test_expect_success TTY 'git tag -l respects pager.tag' '
 	rm -f paginated.out &&
 	test_terminal git -c pager.tag=false tag -l &&
-	! test -e paginated.out
+	test_path_is_missing paginated.out
 '
 
 test_expect_success TTY 'git tag -l respects --no-pager' '
 	rm -f paginated.out &&
 	test_terminal git -c pager.tag --no-pager tag -l &&
-	! test -e paginated.out
+	test_path_is_missing paginated.out
 '
 
 test_expect_success TTY 'git tag with no args defaults to paging' '
 	# no args implies -l so this should page like -l
 	rm -f paginated.out &&
 	test_terminal git tag &&
-	test -e paginated.out
+	test_path_is_file paginated.out
 '
 
 test_expect_success TTY 'git tag with no args respects pager.tag' '
 	# no args implies -l so this should page like -l
 	rm -f paginated.out &&
 	test_terminal git -c pager.tag=false tag &&
-	! test -e paginated.out
+	test_path_is_missing paginated.out
 '
 
 test_expect_success TTY 'git tag --contains defaults to paging' '
 	# --contains implies -l so this should page like -l
 	rm -f paginated.out &&
 	test_terminal git tag --contains &&
-	test -e paginated.out
+	test_path_is_file paginated.out
 '
 
 test_expect_success TTY 'git tag --contains respects pager.tag' '
 	# --contains implies -l so this should page like -l
 	rm -f paginated.out &&
 	test_terminal git -c pager.tag=false tag --contains &&
-	! test -e paginated.out
+	test_path_is_missing paginated.out
 '
 
 test_expect_success TTY 'git tag -a defaults to not paging' '
 	test_when_finished "git tag -d newtag" &&
 	rm -f paginated.out &&
 	test_terminal git tag -am message newtag &&
-	! test -e paginated.out
+	test_path_is_missing paginated.out
 '
 
 test_expect_success TTY 'git tag -a ignores pager.tag' '
 	test_when_finished "git tag -d newtag" &&
 	rm -f paginated.out &&
 	test_terminal git -c pager.tag tag -am message newtag &&
-	! test -e paginated.out
+	test_path_is_missing paginated.out
 '
 
 test_expect_success TTY 'git tag -a respects --paginate' '
 	test_when_finished "git tag -d newtag" &&
 	rm -f paginated.out &&
 	test_terminal git --paginate tag -am message newtag &&
-	test -e paginated.out
+	test_path_is_file paginated.out
 '
 
 test_expect_success TTY 'git tag as alias ignores pager.tag with -a' '
 	test_when_finished "git tag -d newtag" &&
 	rm -f paginated.out &&
 	test_terminal git -c pager.tag -c alias.t=tag t -am message newtag &&
-	! test -e paginated.out
+	test_path_is_missing paginated.out
 '
 
 test_expect_success TTY 'git tag as alias respects pager.tag with -l' '
 	rm -f paginated.out &&
 	test_terminal git -c pager.tag=false -c alias.t=tag t -l &&
-	! test -e paginated.out
+	test_path_is_missing paginated.out
 '
 
 test_expect_success TTY 'git branch defaults to paging' '
 	rm -f paginated.out &&
 	test_terminal git branch &&
-	test -e paginated.out
+	test_path_is_file paginated.out
 '
 
 test_expect_success TTY 'git branch respects pager.branch' '
 	rm -f paginated.out &&
 	test_terminal git -c pager.branch=false branch &&
-	! test -e paginated.out
+	test_path_is_missing paginated.out
 '
 
 test_expect_success TTY 'git branch respects --no-pager' '
 	rm -f paginated.out &&
 	test_terminal git --no-pager branch &&
-	! test -e paginated.out
+	test_path_is_missing paginated.out
 '
 
 test_expect_success TTY 'git branch --edit-description ignores pager.branch' '
@@ -232,8 +232,8 @@ test_expect_success TTY 'git branch --edit-description ignores pager.branch' '
 		touch editor.used
 	EOF
 	EDITOR=./editor test_terminal git -c pager.branch branch --edit-description &&
-	! test -e paginated.out &&
-	test -e editor.used
+	test_path_is_missing paginated.out &&
+	test_path_is_file editor.used
 '
 
 test_expect_success TTY 'git branch --set-upstream-to ignores pager.branch' '
@@ -242,13 +242,13 @@ test_expect_success TTY 'git branch --set-upstream-to ignores pager.branch' '
 	test_when_finished "git branch -D other" &&
 	test_terminal git -c pager.branch branch --set-upstream-to=other &&
 	test_when_finished "git branch --unset-upstream" &&
-	! test -e paginated.out
+	test_path_is_missing paginated.out
 '
 
 test_expect_success TTY 'git config ignores pager.config when setting' '
 	rm -f paginated.out &&
 	test_terminal git -c pager.config config foo.bar bar &&
-	! test -e paginated.out
+	test_path_is_missing paginated.out
 '
 
 test_expect_success TTY 'git config --edit ignores pager.config' '
@@ -257,33 +257,33 @@ test_expect_success TTY 'git config --edit ignores pager.config' '
 		touch editor.used
 	EOF
 	EDITOR=./editor test_terminal git -c pager.config config --edit &&
-	! test -e paginated.out &&
-	test -e editor.used
+	test_path_is_missing paginated.out &&
+	test_path_is_file editor.used
 '
 
 test_expect_success TTY 'git config --get ignores pager.config' '
 	rm -f paginated.out &&
 	test_terminal git -c pager.config config --get foo.bar &&
-	! test -e paginated.out
+	test_path_is_missing paginated.out
 '
 
 test_expect_success TTY 'git config --get-urlmatch defaults to paging' '
 	rm -f paginated.out &&
 	test_terminal git -c http."https://foo.com/".bar=foo \
 			  config --get-urlmatch http https://foo.com &&
-	test -e paginated.out
+	test_path_is_file paginated.out
 '
 
 test_expect_success TTY 'git config --get-all respects pager.config' '
 	rm -f paginated.out &&
 	test_terminal git -c pager.config=false config --get-all foo.bar &&
-	! test -e paginated.out
+	test_path_is_missing paginated.out
 '
 
 test_expect_success TTY 'git config --list defaults to paging' '
 	rm -f paginated.out &&
 	test_terminal git config --list &&
-	test -e paginated.out
+	test_path_is_file paginated.out
 '
 
 
@@ -392,7 +392,7 @@ test_default_pager() {
 			export PATH &&
 			$full_command
 		) &&
-		test -e default_pager_used
+		test_path_is_file default_pager_used
 	"
 }
 
@@ -406,7 +406,7 @@ test_PAGER_overrides() {
 		PAGER='wc >PAGER_used' &&
 		export PAGER &&
 		$full_command &&
-		test -e PAGER_used
+		test_path_is_file PAGER_used
 	"
 }
 
@@ -432,7 +432,7 @@ test_core_pager() {
 		export PAGER &&
 		test_config core.pager 'wc >core.pager_used' &&
 		$full_command &&
-		${if_local_config}test -e core.pager_used
+		${if_local_config}test_path_is_file core.pager_used
 	"
 }
 
@@ -464,7 +464,7 @@ test_pager_subdir_helper() {
 			cd sub &&
 			$full_command
 		) &&
-		${if_local_config}test -e core.pager_used
+		${if_local_config}test_path_is_file core.pager_used
 	"
 }
 
@@ -477,7 +477,7 @@ test_GIT_PAGER_overrides() {
 		GIT_PAGER='wc >GIT_PAGER_used' &&
 		export GIT_PAGER &&
 		$full_command &&
-		test -e GIT_PAGER_used
+		test_path_is_file GIT_PAGER_used
 	"
 }
 
@@ -489,7 +489,7 @@ test_doesnt_paginate() {
 		GIT_PAGER='wc >GIT_PAGER_used' &&
 		export GIT_PAGER &&
 		$full_command &&
-		! test -e GIT_PAGER_used
+		test_path_is_missing GIT_PAGER_used
 	"
 }
 
@@ -656,4 +656,113 @@ test_expect_success TTY 'git tag with auto-columns ' '
 	test_cmp expect actual
 '
 
+test_expect_success 'setup trace2' '
+	GIT_TRACE2_BRIEF=1 &&
+	export GIT_TRACE2_BRIEF
+'
+
+test_expect_success 'setup large log output' '
+	perl -e "
+		print \"this is a long commit message\" x 50000
+	" >commit-msg &&
+	git commit --allow-empty -F commit-msg
+'
+
+test_expect_success TTY 'git returns SIGPIPE on early pager exit' '
+	test_when_finished "rm pager-used trace.normal" &&
+	test_config core.pager ">pager-used; head -n 1; exit 0" &&
+	GIT_TRACE2="$(pwd)/trace.normal" &&
+	export GIT_TRACE2 &&
+	test_when_finished "unset GIT_TRACE2" &&
+
+	if test_have_prereq !MINGW
+	then
+		{ test_terminal git log >/dev/null; OUT=$?; } &&
+		test_match_signal 13 "$OUT"
+	else
+		test_terminal git log
+	fi &&
+
+	grep child_exit trace.normal >child-exits &&
+	test_line_count = 1 child-exits &&
+	grep " code:0 " child-exits &&
+	test_path_is_file pager-used
+'
+
+test_expect_success TTY 'git returns SIGPIPE on early pager non-zero exit' '
+	test_when_finished "rm pager-used trace.normal" &&
+	test_config core.pager ">pager-used; head -n 1; exit 1" &&
+	GIT_TRACE2="$(pwd)/trace.normal" &&
+	export GIT_TRACE2 &&
+	test_when_finished "unset GIT_TRACE2" &&
+
+	if test_have_prereq !MINGW
+	then
+		{ test_terminal git log >/dev/null; OUT=$?; } &&
+		test_match_signal 13 "$OUT"
+	else
+		test_terminal git log
+	fi &&
+
+	grep child_exit trace.normal >child-exits &&
+	test_line_count = 1 child-exits &&
+	grep " code:1 " child-exits &&
+	test_path_is_file pager-used
+'
+
+test_expect_success TTY 'git discards pager non-zero exit without SIGPIPE' '
+	test_when_finished "rm pager-used trace.normal" &&
+	test_config core.pager "wc >pager-used; exit 1" &&
+	GIT_TRACE2="$(pwd)/trace.normal" &&
+	export GIT_TRACE2 &&
+	test_when_finished "unset GIT_TRACE2" &&
+
+	test_terminal git log &&
+
+	grep child_exit trace.normal >child-exits &&
+	test_line_count = 1 child-exits &&
+	grep " code:1 " child-exits &&
+	test_path_is_file pager-used
+'
+
+test_expect_success TTY 'git skips paging nonexisting command' '
+	test_when_finished "rm trace.normal" &&
+	test_config core.pager "does-not-exist" &&
+	GIT_TRACE2="$(pwd)/trace.normal" &&
+	export GIT_TRACE2 &&
+	test_when_finished "unset GIT_TRACE2" &&
+
+	test_terminal git log &&
+
+	grep child_exit trace.normal >child-exits &&
+	test_line_count = 1 child-exits &&
+	grep " code:-1 " child-exits
+'
+
+test_expect_success TTY 'git returns SIGPIPE on propagated signals from pager' '
+	test_when_finished "rm pager-used trace.normal" &&
+	test_config core.pager ">pager-used; exec test-tool sigchain" &&
+	GIT_TRACE2="$(pwd)/trace.normal" &&
+	export GIT_TRACE2 &&
+	test_when_finished "unset GIT_TRACE2" &&
+
+	if test_have_prereq !MINGW
+	then
+		{ test_terminal git log >/dev/null; OUT=$?; } &&
+		test_match_signal 13 "$OUT"
+	else
+		test_terminal git log
+	fi &&
+
+	grep child_exit trace.normal >child-exits &&
+	test_line_count = 1 child-exits &&
+	grep " code:143 " child-exits &&
+	test_path_is_file pager-used
+'
+
+test_expect_success TTY 'non-existent pager doesnt cause crash' '
+	test_config pager.show invalid-pager &&
+	test_terminal git show
+'
+
 test_done
diff --git a/t/t7007-show.sh b/t/t7007-show.sh
index 42d3db6..f908a4d 100755
--- a/t/t7007-show.sh
+++ b/t/t7007-show.sh
@@ -2,6 +2,7 @@
 
 test_description='git show'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -38,6 +39,45 @@ test_expect_success 'showing two commits' '
 	test_cmp expect actual.filtered
 '
 
+test_expect_success 'showing a tree' '
+	cat >expected <<-EOF &&
+	tree main1:
+
+	main1.t
+	EOF
+	git show main1: >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'showing two trees' '
+	cat >expected <<-EOF &&
+	tree main1^{tree}
+
+	main1.t
+
+	tree main2^{tree}
+
+	main1.t
+	main2.t
+	EOF
+	git show main1^{tree} main2^{tree} >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'showing a trees is not recursive' '
+	git worktree add not-recursive main1 &&
+	mkdir not-recursive/a &&
+	test_commit -C not-recursive a/file &&
+	cat >expected <<-EOF &&
+	tree HEAD^{tree}
+
+	a/
+	main1.t
+	EOF
+	git -C not-recursive show HEAD^{tree} >actual &&
+	test_cmp expected actual
+'
+
 test_expect_success 'showing a range walks (linear)' '
 	cat >expect <<-EOF &&
 	commit $(git rev-parse main3)
diff --git a/t/t7008-filter-branch-null-sha1.sh b/t/t7008-filter-branch-null-sha1.sh
index 9ba9f24..93fbc92 100755
--- a/t/t7008-filter-branch-null-sha1.sh
+++ b/t/t7008-filter-branch-null-sha1.sh
@@ -1,6 +1,7 @@
 #!/bin/sh
 
 test_description='filter-branch removal of trees with null sha1'
+
 . ./test-lib.sh
 
 test_expect_success 'setup: base commits' '
diff --git a/t/t7010-setup.sh b/t/t7010-setup.sh
index 0335a9a..520f96d 100755
--- a/t/t7010-setup.sh
+++ b/t/t7010-setup.sh
@@ -137,7 +137,7 @@ test_expect_success 'setup deeper work tree' '
 
 test_expect_success 'add a directory outside the work tree' '(
 	cd tester &&
-	d1="$(cd .. ; pwd)" &&
+	d1="$(cd .. && pwd)" &&
 	test_must_fail git add "$d1"
 )'
 
diff --git a/t/t7011-skip-worktree-reading.sh b/t/t7011-skip-worktree-reading.sh
index 37525ca..4adac5a 100755
--- a/t/t7011-skip-worktree-reading.sh
+++ b/t/t7011-skip-worktree-reading.sh
@@ -5,6 +5,7 @@
 
 test_description='skip-worktree bit test'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 cat >expect.full <<EOF
@@ -109,15 +110,6 @@ test_expect_success 'ls-files --modified' '
 	test -z "$(git ls-files -m)"
 '
 
-test_expect_success 'grep with skip-worktree file' '
-	git update-index --no-skip-worktree 1 &&
-	echo test > 1 &&
-	git update-index 1 &&
-	git update-index --skip-worktree 1 &&
-	rm 1 &&
-	test "$(git grep --no-ext-grep test)" = "1:test"
-'
-
 echo ":000000 100644 $ZERO_OID $EMPTY_BLOB A	1" > expected
 test_expect_success 'diff-index does not examine skip-worktree absent entries' '
 	setup_absent &&
@@ -141,11 +133,6 @@ test_expect_success 'diff-files does not examine skip-worktree dirty entries' '
 	test -z "$(git diff-files -- one)"
 '
 
-test_expect_success 'git-rm succeeds on skip-worktree absent entries' '
-	setup_absent &&
-	git rm 1
-'
-
 test_expect_success 'commit on skip-worktree absent entries' '
 	git reset &&
 	setup_absent &&
diff --git a/t/t7012-skip-worktree-writing.sh b/t/t7012-skip-worktree-writing.sh
index 7476781..cd5c20f 100755
--- a/t/t7012-skip-worktree-writing.sh
+++ b/t/t7012-skip-worktree-writing.sh
@@ -60,13 +60,6 @@ setup_absent() {
 	git update-index --skip-worktree 1
 }
 
-test_absent() {
-	echo "100644 $EMPTY_BLOB 0	1" > expected &&
-	git ls-files --stage 1 > result &&
-	test_cmp expected result &&
-	test ! -f 1
-}
-
 setup_dirty() {
 	git update-index --force-remove 1 &&
 	echo dirty > 1 &&
@@ -100,18 +93,6 @@ test_expect_success 'index setup' '
 	test_cmp expected result
 '
 
-test_expect_success 'git-add ignores worktree content' '
-	setup_absent &&
-	git add 1 &&
-	test_absent
-'
-
-test_expect_success 'git-add ignores worktree content' '
-	setup_dirty &&
-	git add 1 &&
-	test_dirty
-'
-
 test_expect_success 'git-rm fails if worktree is dirty' '
 	setup_dirty &&
 	test_must_fail git rm 1 &&
@@ -125,13 +106,13 @@ EOF
 test_expect_success 'git-clean, absent case' '
 	setup_absent &&
 	git clean -n > result &&
-	test_i18ncmp expected result
+	test_cmp expected result
 '
 
 test_expect_success 'git-clean, dirty case' '
 	setup_dirty &&
 	git clean -n > result &&
-	test_i18ncmp expected result
+	test_cmp expected result
 '
 
 test_expect_success '--ignore-skip-worktree-entries leaves worktree alone' '
@@ -149,6 +130,64 @@ test_expect_success '--ignore-skip-worktree-entries leaves worktree alone' '
 		--diff-filter=D -- keep-me.t
 '
 
+test_expect_success 'stash restore in sparse checkout' '
+	test_create_repo stash-restore &&
+	(
+		cd stash-restore &&
+
+		mkdir subdir &&
+		echo A >subdir/A &&
+		echo untouched >untouched &&
+		echo removeme >removeme &&
+		echo modified >modified &&
+		git add . &&
+		git commit -m Initial &&
+
+		echo AA >>subdir/A &&
+		echo addme >addme &&
+		echo tweaked >>modified &&
+		rm removeme &&
+		git add addme &&
+
+		git stash push &&
+
+		git sparse-checkout set --no-cone subdir &&
+
+		# Ensure after sparse-checkout we only have expected files
+		cat >expect <<-EOF &&
+		S modified
+		S removeme
+		H subdir/A
+		S untouched
+		EOF
+		git ls-files -t >actual &&
+		test_cmp expect actual &&
+
+		test_path_is_missing addme &&
+		test_path_is_missing modified &&
+		test_path_is_missing removeme &&
+		test_path_is_file    subdir/A &&
+		test_path_is_missing untouched &&
+
+		# Put a file in the working directory in the way
+		echo in the way >modified &&
+		test_must_fail git stash apply 2>error&&
+
+		grep "changes.*would be overwritten by merge" error &&
+
+		echo in the way >expect &&
+		test_cmp expect modified &&
+		git diff --quiet HEAD ":!modified" &&
+
+		# ...and that working directory reflects the files correctly
+		test_path_is_missing addme &&
+		test_path_is_file    modified &&
+		test_path_is_missing removeme &&
+		test_path_is_file    subdir/A &&
+		test_path_is_missing untouched
+	)
+'
+
 #TODO test_expect_failure 'git-apply adds file' false
 #TODO test_expect_failure 'git-apply updates file' false
 #TODO test_expect_failure 'git-apply removes file' false
diff --git a/t/t7030-verify-tag.sh b/t/t7030-verify-tag.sh
index 5c5bc32..6f526c3 100755
--- a/t/t7030-verify-tag.sh
+++ b/t/t7030-verify-tag.sh
@@ -1,6 +1,9 @@
 #!/bin/sh
 
 test_description='signed tag tests'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 . "$TEST_DIRECTORY/lib-gpg.sh"
 
@@ -17,7 +20,7 @@ test_expect_success GPG 'create signed tags' '
 	echo 3 >elif && git add elif &&
 	test_tick && git commit -m "third on side" &&
 
-	git checkout master &&
+	git checkout main &&
 	test_tick && git merge -S side &&
 	git tag -s -m merge merge &&
 
@@ -112,7 +115,7 @@ test_expect_success GPGSM 'verify and show signatures x509 with high minTrustLev
 
 test_expect_success GPG 'detect fudged signature' '
 	git cat-file tag seventh-signed >raw &&
-	sed -e "/^tag / s/seventh/7th forged/" raw >forged1 &&
+	sed -e "/^tag / s/seventh/7th-forged/" raw >forged1 &&
 	git hash-object -w -t tag forged1 >forged1.tag &&
 	test_must_fail git verify-tag $(cat forged1.tag) 2>actual1 &&
 	grep "BAD signature from" actual1 &&
@@ -191,6 +194,10 @@ test_expect_success GPG 'verifying tag with --format' '
 	test_cmp expect actual
 '
 
+test_expect_success GPG 'verifying tag with --format="%(rest)" must fail' '
+	test_must_fail git verify-tag --format="%(rest)" "fourth-signed"
+'
+
 test_expect_success GPG 'verifying a forged tag with --format should fail silently' '
 	test_must_fail git verify-tag --format="tagname : %(tag)" $(cat forged1.tag) >actual-forged &&
 	test_must_be_empty actual-forged
diff --git a/t/t7031-verify-tag-signed-ssh.sh b/t/t7031-verify-tag-signed-ssh.sh
new file mode 100755
index 0000000..20913b3
--- /dev/null
+++ b/t/t7031-verify-tag-signed-ssh.sh
@@ -0,0 +1,213 @@
+#!/bin/sh
+
+test_description='signed tag tests'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+. ./test-lib.sh
+. "$TEST_DIRECTORY/lib-gpg.sh"
+
+test_expect_success GPGSSH 'create signed tags ssh' '
+	test_when_finished "test_unconfig commit.gpgsign" &&
+	test_config gpg.format ssh &&
+	test_config user.signingkey "${GPGSSH_KEY_PRIMARY}" &&
+
+	echo 1 >file && git add file &&
+	test_tick && git commit -m initial &&
+	git tag -s -m initial initial &&
+	git branch side &&
+
+	echo 2 >file && test_tick && git commit -a -m second &&
+	git tag -s -m second second &&
+
+	git checkout side &&
+	echo 3 >elif && git add elif &&
+	test_tick && git commit -m "third on side" &&
+
+	git checkout main &&
+	test_tick && git merge -S side &&
+	git tag -s -m merge merge &&
+
+	echo 4 >file && test_tick && git commit -a -S -m "fourth unsigned" &&
+	git tag -a -m fourth-unsigned fourth-unsigned &&
+
+	test_tick && git commit --amend -S -m "fourth signed" &&
+	git tag -s -m fourth fourth-signed &&
+
+	echo 5 >file && test_tick && git commit -a -m "fifth" &&
+	git tag fifth-unsigned &&
+
+	git config commit.gpgsign true &&
+	echo 6 >file && test_tick && git commit -a -m "sixth" &&
+	git tag -a -m sixth sixth-unsigned &&
+
+	test_tick && git rebase -f HEAD^^ && git tag -s -m 6th sixth-signed HEAD^ &&
+	git tag -m seventh -s seventh-signed &&
+
+	echo 8 >file && test_tick && git commit -a -m eighth &&
+	git tag -u"${GPGSSH_KEY_UNTRUSTED}" -m eighth eighth-signed-alt
+'
+
+test_expect_success GPGSSH,GPGSSH_VERIFYTIME 'create signed tags with keys having defined lifetimes' '
+	test_when_finished "test_unconfig commit.gpgsign" &&
+	test_config gpg.format ssh &&
+
+	echo expired >file && test_tick && git commit -a -m expired -S"${GPGSSH_KEY_EXPIRED}" &&
+	git tag -s -u "${GPGSSH_KEY_EXPIRED}" -m expired-signed expired-signed &&
+
+	echo notyetvalid >file && test_tick && git commit -a -m notyetvalid -S"${GPGSSH_KEY_NOTYETVALID}" &&
+	git tag -s -u "${GPGSSH_KEY_NOTYETVALID}" -m notyetvalid-signed notyetvalid-signed &&
+
+	echo timeboxedvalid >file && test_tick && git commit -a -m timeboxedvalid -S"${GPGSSH_KEY_TIMEBOXEDVALID}" &&
+	git tag -s -u "${GPGSSH_KEY_TIMEBOXEDVALID}" -m timeboxedvalid-signed timeboxedvalid-signed &&
+
+	echo timeboxedinvalid >file && test_tick && git commit -a -m timeboxedinvalid -S"${GPGSSH_KEY_TIMEBOXEDINVALID}" &&
+	git tag -s -u "${GPGSSH_KEY_TIMEBOXEDINVALID}" -m timeboxedinvalid-signed timeboxedinvalid-signed
+'
+
+test_expect_success GPGSSH 'verify and show ssh signatures' '
+	test_config gpg.ssh.allowedSignersFile "${GPGSSH_ALLOWED_SIGNERS}" &&
+	(
+		for tag in initial second merge fourth-signed sixth-signed seventh-signed
+		do
+			git verify-tag $tag 2>actual &&
+			grep "${GPGSSH_GOOD_SIGNATURE_TRUSTED}" actual &&
+			! grep "${GPGSSH_BAD_SIGNATURE}" actual &&
+			echo $tag OK || exit 1
+		done
+	) &&
+	(
+		for tag in fourth-unsigned fifth-unsigned sixth-unsigned
+		do
+			test_must_fail git verify-tag $tag 2>actual &&
+			! grep "${GPGSSH_GOOD_SIGNATURE_TRUSTED}" actual &&
+			! grep "${GPGSSH_BAD_SIGNATURE}" actual &&
+			echo $tag OK || exit 1
+		done
+	) &&
+	(
+		for tag in eighth-signed-alt
+		do
+			test_must_fail git verify-tag $tag 2>actual &&
+			grep "${GPGSSH_GOOD_SIGNATURE_UNTRUSTED}" actual &&
+			! grep "${GPGSSH_BAD_SIGNATURE}" actual &&
+			grep "${GPGSSH_KEY_NOT_TRUSTED}" actual &&
+			echo $tag OK || exit 1
+		done
+	)
+'
+
+test_expect_success GPGSSH,GPGSSH_VERIFYTIME 'verify-tag exits failure on expired signature key' '
+	test_config gpg.ssh.allowedSignersFile "${GPGSSH_ALLOWED_SIGNERS}" &&
+	test_must_fail git verify-tag expired-signed 2>actual &&
+	! grep "${GPGSSH_GOOD_SIGNATURE_TRUSTED}" actual
+'
+
+test_expect_success GPGSSH,GPGSSH_VERIFYTIME 'verify-tag exits failure on not yet valid signature key' '
+	test_config gpg.ssh.allowedSignersFile "${GPGSSH_ALLOWED_SIGNERS}" &&
+	test_must_fail git verify-tag notyetvalid-signed 2>actual &&
+	! grep "${GPGSSH_GOOD_SIGNATURE_TRUSTED}" actual
+'
+
+test_expect_success GPGSSH,GPGSSH_VERIFYTIME 'verify-tag succeeds with tag date and key validity matching' '
+	test_config gpg.ssh.allowedSignersFile "${GPGSSH_ALLOWED_SIGNERS}" &&
+	git verify-tag timeboxedvalid-signed 2>actual &&
+	grep "${GPGSSH_GOOD_SIGNATURE_TRUSTED}" actual &&
+	! grep "${GPGSSH_BAD_SIGNATURE}" actual
+'
+
+test_expect_success GPGSSH,GPGSSH_VERIFYTIME 'verify-tag failes with tag date outside of key validity' '
+	test_config gpg.ssh.allowedSignersFile "${GPGSSH_ALLOWED_SIGNERS}" &&
+	test_must_fail git verify-tag timeboxedinvalid-signed 2>actual &&
+	! grep "${GPGSSH_GOOD_SIGNATURE_TRUSTED}" actual
+'
+
+test_expect_success GPGSSH 'detect fudged ssh signature' '
+	test_config gpg.ssh.allowedSignersFile "${GPGSSH_ALLOWED_SIGNERS}" &&
+	git cat-file tag seventh-signed >raw &&
+	sed -e "/^tag / s/seventh/7th-forged/" raw >forged1 &&
+	git hash-object -w -t tag forged1 >forged1.tag &&
+	test_must_fail git verify-tag $(cat forged1.tag) 2>actual1 &&
+	grep "${GPGSSH_BAD_SIGNATURE}" actual1 &&
+	! grep "${GPGSSH_GOOD_SIGNATURE_TRUSTED}" actual1 &&
+	! grep "${GPGSSH_GOOD_SIGNATURE_UNTRUSTED}" actual1
+'
+
+test_expect_success GPGSSH 'verify ssh signatures with --raw' '
+	test_config gpg.ssh.allowedSignersFile "${GPGSSH_ALLOWED_SIGNERS}" &&
+	(
+		for tag in initial second merge fourth-signed sixth-signed seventh-signed
+		do
+			git verify-tag --raw $tag 2>actual &&
+			grep "${GPGSSH_GOOD_SIGNATURE_TRUSTED}" actual &&
+			! grep "${GPGSSH_BAD_SIGNATURE}" actual &&
+			echo $tag OK || exit 1
+		done
+	) &&
+	(
+		for tag in fourth-unsigned fifth-unsigned sixth-unsigned
+		do
+			test_must_fail git verify-tag --raw $tag 2>actual &&
+			! grep "${GPGSSH_GOOD_SIGNATURE_TRUSTED}" actual &&
+			! grep "${GPGSSH_BAD_SIGNATURE}" actual &&
+			echo $tag OK || exit 1
+		done
+	) &&
+	(
+		for tag in eighth-signed-alt
+		do
+			test_must_fail git verify-tag --raw $tag 2>actual &&
+			grep "${GPGSSH_GOOD_SIGNATURE_UNTRUSTED}" actual &&
+			! grep "${GPGSSH_BAD_SIGNATURE}" actual &&
+			echo $tag OK || exit 1
+		done
+	)
+'
+
+test_expect_success GPGSSH 'verify signatures with --raw ssh' '
+	test_config gpg.ssh.allowedSignersFile "${GPGSSH_ALLOWED_SIGNERS}" &&
+	git verify-tag --raw sixth-signed 2>actual &&
+	grep "${GPGSSH_GOOD_SIGNATURE_TRUSTED}" actual &&
+	! grep "${GPGSSH_BAD_SIGNATURE}" actual &&
+	echo sixth-signed OK
+'
+
+test_expect_success GPGSSH 'verify multiple tags ssh' '
+	test_config gpg.ssh.allowedSignersFile "${GPGSSH_ALLOWED_SIGNERS}" &&
+	tags="seventh-signed sixth-signed" &&
+	for i in $tags
+	do
+		git verify-tag -v --raw $i || return 1
+	done >expect.stdout 2>expect.stderr.1 &&
+	grep "^${GPGSSH_GOOD_SIGNATURE_TRUSTED}" <expect.stderr.1 >expect.stderr &&
+	git verify-tag -v --raw $tags >actual.stdout 2>actual.stderr.1 &&
+	grep "^${GPGSSH_GOOD_SIGNATURE_TRUSTED}" <actual.stderr.1 >actual.stderr &&
+	test_cmp expect.stdout actual.stdout &&
+	test_cmp expect.stderr actual.stderr
+'
+
+test_expect_success GPGSSH 'verifying tag with --format - ssh' '
+	test_config gpg.ssh.allowedSignersFile "${GPGSSH_ALLOWED_SIGNERS}" &&
+	cat >expect <<-\EOF &&
+	tagname : fourth-signed
+	EOF
+	git verify-tag --format="tagname : %(tag)" "fourth-signed" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success GPGSSH 'verifying a forged tag with --format should fail silently - ssh' '
+	test_must_fail git verify-tag --format="tagname : %(tag)" $(cat forged1.tag) >actual-forged &&
+	test_must_be_empty actual-forged
+'
+
+test_expect_success GPGSSH 'rev-list --format=%G' '
+	test_config gpg.ssh.allowedSignersFile "${GPGSSH_ALLOWED_SIGNERS}" &&
+	git rev-list -1 --format="%G? %H" sixth-signed >actual &&
+	cat >expect <<-EOF &&
+	commit $(git rev-parse sixth-signed^0)
+	G $(git rev-parse sixth-signed^0)
+	EOF
+	test_cmp expect actual
+'
+
+test_done
diff --git a/t/t7060-wtstatus.sh b/t/t7060-wtstatus.sh
index d521874..aaeb4a5 100755
--- a/t/t7060-wtstatus.sh
+++ b/t/t7060-wtstatus.sh
@@ -2,6 +2,10 @@
 
 test_description='basic work tree status reporting'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -51,11 +55,11 @@ EOF
 		git checkout -b side HEAD^ &&
 		git rm foo &&
 		git commit -m delete &&
-		test_must_fail git merge master &&
+		test_must_fail git merge main &&
 		test_must_fail git commit --dry-run >../actual &&
-		test_i18ncmp ../expect ../actual &&
+		test_cmp ../expect ../actual &&
 		git status >../actual &&
-		test_i18ncmp ../expect ../actual
+		test_cmp ../expect ../actual
 	)
 '
 
@@ -124,18 +128,18 @@ test_expect_success 'git diff-index --cached -C shows 2 copies + 1 unmerged' '
 
 test_expect_success 'status when conflicts with add and rm advice (deleted by them)' '
 	git reset --hard &&
-	git checkout master &&
+	git checkout main &&
 	test_commit init main.txt init &&
 	git checkout -b second_branch &&
 	git rm main.txt &&
 	git commit -m "main.txt deleted on second_branch" &&
 	test_commit second conflict.txt second &&
-	git checkout master &&
+	git checkout main &&
 	test_commit on_second main.txt on_second &&
-	test_commit master conflict.txt master &&
+	test_commit main conflict.txt main &&
 	test_must_fail git merge second_branch &&
 	cat >expected <<\EOF &&
-On branch master
+On branch main
 You have unmerged paths.
   (fix conflicts and run "git commit")
   (use "git merge --abort" to abort the merge)
@@ -148,7 +152,7 @@ Unmerged paths:
 no changes added to commit (use "git add" and/or "git commit -a")
 EOF
 	git status --untracked-files=no >actual &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 
@@ -157,8 +161,8 @@ test_expect_success 'prepare for conflicts' '
 	git checkout -b conflict &&
 	test_commit one main.txt one &&
 	git branch conflict_second &&
-	git mv main.txt sub_master.txt &&
-	git commit -m "main.txt renamed in sub_master.txt" &&
+	git mv main.txt sub_main.txt &&
+	git commit -m "main.txt renamed in sub_main.txt" &&
 	git checkout conflict_second &&
 	git mv main.txt sub_second.txt &&
 	git commit -m "main.txt renamed in sub_second.txt"
@@ -176,20 +180,20 @@ You have unmerged paths.
 Unmerged paths:
   (use "git add/rm <file>..." as appropriate to mark resolution)
 	both deleted:    main.txt
-	added by them:   sub_master.txt
+	added by them:   sub_main.txt
 	added by us:     sub_second.txt
 
 no changes added to commit (use "git add" and/or "git commit -a")
 EOF
 	git status --untracked-files=no >actual &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 
 test_expect_success 'status when conflicts with only rm advice (both deleted)' '
 	git reset --hard conflict_second &&
 	test_must_fail git merge conflict &&
-	git add sub_master.txt &&
+	git add sub_main.txt &&
 	git add sub_second.txt &&
 	cat >expected <<\EOF &&
 On branch conflict_second
@@ -198,7 +202,7 @@ You have unmerged paths.
   (use "git merge --abort" to abort the merge)
 
 Changes to be committed:
-	new file:   sub_master.txt
+	new file:   sub_main.txt
 
 Unmerged paths:
   (use "git rm <file>..." to mark resolution)
@@ -207,14 +211,14 @@ Unmerged paths:
 Untracked files not listed (use -u option to show untracked files)
 EOF
 	git status --untracked-files=no >actual &&
-	test_i18ncmp expected actual &&
+	test_cmp expected actual &&
 	git reset --hard &&
-	git checkout master
+	git checkout main
 '
 
 test_expect_success 'status --branch with detached HEAD' '
 	git reset --hard &&
-	git checkout master^0 &&
+	git checkout main^0 &&
 	git status --branch --porcelain >actual &&
 	cat >expected <<-EOF &&
 	## HEAD (no branch)
@@ -224,13 +228,13 @@ test_expect_success 'status --branch with detached HEAD' '
 	?? expected
 	?? mdconflict/
 	EOF
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 ## Duplicate the above test and verify --porcelain=v1 arg parsing.
 test_expect_success 'status --porcelain=v1 --branch with detached HEAD' '
 	git reset --hard &&
-	git checkout master^0 &&
+	git checkout main^0 &&
 	git status --branch --porcelain=v1 >actual &&
 	cat >expected <<-EOF &&
 	## HEAD (no branch)
@@ -240,7 +244,7 @@ test_expect_success 'status --porcelain=v1 --branch with detached HEAD' '
 	?? expected
 	?? mdconflict/
 	EOF
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 ## Verify parser error on invalid --porcelain argument.
diff --git a/t/t7062-wtstatus-ignorecase.sh b/t/t7062-wtstatus-ignorecase.sh
index 73709db..caf372a 100755
--- a/t/t7062-wtstatus-ignorecase.sh
+++ b/t/t7062-wtstatus-ignorecase.sh
@@ -2,6 +2,7 @@
 
 test_description='git-status with core.ignorecase=true'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'status with hash collisions' '
diff --git a/t/t7063-status-untracked-cache.sh b/t/t7063-status-untracked-cache.sh
index a682a3d..8929ef4 100755
--- a/t/t7063-status-untracked-cache.sh
+++ b/t/t7063-status-untracked-cache.sh
@@ -2,6 +2,9 @@
 
 test_description='test untracked cache'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 # On some filesystems (e.g. FreeBSD's ext2 and ufs) directory mtime
@@ -54,6 +57,20 @@ iuc () {
 	return $ret
 }
 
+get_relevant_traces () {
+	# From the GIT_TRACE2_PERF data of the form
+	#    $TIME $FILE:$LINE | d0 | main | data | r1 | ? | ? | read_directo | $RELEVANT_STAT
+	# extract the $RELEVANT_STAT fields.  We don't care about region_enter
+	# or region_leave, or stats for things outside read_directory.
+	INPUT_FILE=$1
+	OUTPUT_FILE=$2
+	grep data.*read_directo $INPUT_FILE |
+	    cut -d "|" -f 9 |
+	    grep -v visited \
+	    >"$OUTPUT_FILE"
+}
+
+
 test_lazy_prereq UNTRACKED_CACHE '
 	{ git update-index --test-untracked-cache; ret=$?; } &&
 	test $ret -ne 1
@@ -69,11 +86,15 @@ test_expect_success 'core.untrackedCache is unset' '
 '
 
 test_expect_success 'setup' '
-	git init worktree &&
+	git init --template= worktree &&
 	cd worktree &&
 	mkdir done dtwo dthree &&
 	touch one two three done/one dtwo/two dthree/three &&
+	test-tool chmtime =-300 one two three done/one dtwo/two dthree/three &&
+	test-tool chmtime =-300 done dtwo dthree &&
+	test-tool chmtime =-300 . &&
 	git add one two done/one &&
+	mkdir .git/info &&
 	: >.git/info/exclude &&
 	git update-index --untracked-cache &&
 	test_oid_cache <<-EOF
@@ -125,20 +146,21 @@ two
 EOF
 
 test_expect_success 'status first time (empty cache)' '
-	avoid_racy &&
-	: >../trace &&
-	GIT_TRACE_UNTRACKED_STATS="$TRASH_DIRECTORY/trace" \
+	: >../trace.output &&
+	GIT_TRACE2_PERF="$TRASH_DIRECTORY/trace.output" \
 	git status --porcelain >../actual &&
 	iuc status --porcelain >../status.iuc &&
 	test_cmp ../status.expect ../status.iuc &&
 	test_cmp ../status.expect ../actual &&
+	get_relevant_traces ../trace.output ../trace.relevant &&
 	cat >../trace.expect <<EOF &&
-node creation: 3
-gitignore invalidation: 1
-directory invalidation: 0
-opendir: 4
+ ....path:
+ ....node-creation:3
+ ....gitignore-invalidation:1
+ ....directory-invalidation:0
+ ....opendir:4
 EOF
-	test_cmp ../trace.expect ../trace
+	test_cmp ../trace.expect ../trace.relevant
 '
 
 test_expect_success 'untracked cache after first status' '
@@ -147,20 +169,21 @@ test_expect_success 'untracked cache after first status' '
 '
 
 test_expect_success 'status second time (fully populated cache)' '
-	avoid_racy &&
-	: >../trace &&
-	GIT_TRACE_UNTRACKED_STATS="$TRASH_DIRECTORY/trace" \
+	: >../trace.output &&
+	GIT_TRACE2_PERF="$TRASH_DIRECTORY/trace.output" \
 	git status --porcelain >../actual &&
 	iuc status --porcelain >../status.iuc &&
 	test_cmp ../status.expect ../status.iuc &&
 	test_cmp ../status.expect ../actual &&
+	get_relevant_traces ../trace.output ../trace.relevant &&
 	cat >../trace.expect <<EOF &&
-node creation: 0
-gitignore invalidation: 0
-directory invalidation: 0
-opendir: 0
+ ....path:
+ ....node-creation:0
+ ....gitignore-invalidation:0
+ ....directory-invalidation:0
+ ....opendir:0
 EOF
-	test_cmp ../trace.expect ../trace
+	test_cmp ../trace.expect ../trace.relevant
 '
 
 test_expect_success 'untracked cache after second status' '
@@ -168,11 +191,124 @@ test_expect_success 'untracked cache after second status' '
 	test_cmp ../dump.expect ../actual
 '
 
+cat >../status_uall.expect <<EOF &&
+A  done/one
+A  one
+A  two
+?? dthree/three
+?? dtwo/two
+?? three
+EOF
+
+# Bypassing the untracked cache here is not desirable from an
+# end-user perspective, but is expected in the current design.
+# The untracked cache data stored for a -unormal run cannot be
+# correctly used in a -uall run - it would yield incorrect output.
+test_expect_success 'untracked cache is bypassed with -uall' '
+	: >../trace.output &&
+	GIT_TRACE2_PERF="$TRASH_DIRECTORY/trace.output" \
+	git status -uall --porcelain >../actual &&
+	iuc status -uall --porcelain >../status.iuc &&
+	test_cmp ../status_uall.expect ../status.iuc &&
+	test_cmp ../status_uall.expect ../actual &&
+	get_relevant_traces ../trace.output ../trace.relevant &&
+	cat >../trace.expect <<EOF &&
+ ....path:
+EOF
+	test_cmp ../trace.expect ../trace.relevant
+'
+
+test_expect_success 'untracked cache remains after bypass' '
+	test-tool dump-untracked-cache >../actual &&
+	test_cmp ../dump.expect ../actual
+'
+
+test_expect_success 'if -uall is configured, untracked cache gets populated by default' '
+	test_config status.showuntrackedfiles all &&
+	: >../trace.output &&
+	GIT_TRACE2_PERF="$TRASH_DIRECTORY/trace.output" \
+	git status --porcelain >../actual &&
+	iuc status --porcelain >../status.iuc &&
+	test_cmp ../status_uall.expect ../status.iuc &&
+	test_cmp ../status_uall.expect ../actual &&
+	get_relevant_traces ../trace.output ../trace.relevant &&
+	cat >../trace.expect <<EOF &&
+ ....path:
+ ....node-creation:3
+ ....gitignore-invalidation:1
+ ....directory-invalidation:0
+ ....opendir:4
+EOF
+	test_cmp ../trace.expect ../trace.relevant
+'
+
+cat >../dump_uall.expect <<EOF &&
+info/exclude $EMPTY_BLOB
+core.excludesfile $ZERO_OID
+exclude_per_dir .gitignore
+flags 00000000
+/ $ZERO_OID recurse valid
+three
+/done/ $ZERO_OID recurse valid
+/dthree/ $ZERO_OID recurse valid
+three
+/dtwo/ $ZERO_OID recurse valid
+two
+EOF
+
+test_expect_success 'if -uall was configured, untracked cache is populated' '
+	test-tool dump-untracked-cache >../actual &&
+	test_cmp ../dump_uall.expect ../actual
+'
+
+test_expect_success 'if -uall is configured, untracked cache is used by default' '
+	test_config status.showuntrackedfiles all &&
+	: >../trace.output &&
+	GIT_TRACE2_PERF="$TRASH_DIRECTORY/trace.output" \
+	git status --porcelain >../actual &&
+	iuc status --porcelain >../status.iuc &&
+	test_cmp ../status_uall.expect ../status.iuc &&
+	test_cmp ../status_uall.expect ../actual &&
+	get_relevant_traces ../trace.output ../trace.relevant &&
+	cat >../trace.expect <<EOF &&
+ ....path:
+ ....node-creation:0
+ ....gitignore-invalidation:0
+ ....directory-invalidation:0
+ ....opendir:0
+EOF
+	test_cmp ../trace.expect ../trace.relevant
+'
+
+# Bypassing the untracked cache here is not desirable from an
+# end-user perspective, but is expected in the current design.
+# The untracked cache data stored for a -all run cannot be
+# correctly used in a -unormal run - it would yield incorrect
+# output.
+test_expect_success 'if -uall is configured, untracked cache is bypassed with -unormal' '
+	test_config status.showuntrackedfiles all &&
+	: >../trace.output &&
+	GIT_TRACE2_PERF="$TRASH_DIRECTORY/trace.output" \
+	git status -unormal --porcelain >../actual &&
+	iuc status -unormal --porcelain >../status.iuc &&
+	test_cmp ../status.expect ../status.iuc &&
+	test_cmp ../status.expect ../actual &&
+	get_relevant_traces ../trace.output ../trace.relevant &&
+	cat >../trace.expect <<EOF &&
+ ....path:
+EOF
+	test_cmp ../trace.expect ../trace.relevant
+'
+
+test_expect_success 'repopulate untracked cache for -unormal' '
+	git status --porcelain
+'
+
 test_expect_success 'modify in root directory, one dir invalidation' '
-	avoid_racy &&
 	: >four &&
-	: >../trace &&
-	GIT_TRACE_UNTRACKED_STATS="$TRASH_DIRECTORY/trace" \
+	test-tool chmtime =-240 four &&
+	: >../trace.output &&
+	GIT_TRACE2_PERF="$TRASH_DIRECTORY/trace.output" \
 	git status --porcelain >../actual &&
 	iuc status --porcelain >../status.iuc &&
 	cat >../status.expect <<EOF &&
@@ -186,13 +322,15 @@ A  two
 EOF
 	test_cmp ../status.expect ../status.iuc &&
 	test_cmp ../status.expect ../actual &&
+	get_relevant_traces ../trace.output ../trace.relevant &&
 	cat >../trace.expect <<EOF &&
-node creation: 0
-gitignore invalidation: 0
-directory invalidation: 1
-opendir: 1
+ ....path:
+ ....node-creation:0
+ ....gitignore-invalidation:0
+ ....directory-invalidation:1
+ ....opendir:1
 EOF
-	test_cmp ../trace.expect ../trace
+	test_cmp ../trace.expect ../trace.relevant
 
 '
 
@@ -218,10 +356,9 @@ EOF
 '
 
 test_expect_success 'new .gitignore invalidates recursively' '
-	avoid_racy &&
 	echo four >.gitignore &&
-	: >../trace &&
-	GIT_TRACE_UNTRACKED_STATS="$TRASH_DIRECTORY/trace" \
+	: >../trace.output &&
+	GIT_TRACE2_PERF="$TRASH_DIRECTORY/trace.output" \
 	git status --porcelain >../actual &&
 	iuc status --porcelain >../status.iuc &&
 	cat >../status.expect <<EOF &&
@@ -235,13 +372,15 @@ A  two
 EOF
 	test_cmp ../status.expect ../status.iuc &&
 	test_cmp ../status.expect ../actual &&
+	get_relevant_traces ../trace.output ../trace.relevant &&
 	cat >../trace.expect <<EOF &&
-node creation: 0
-gitignore invalidation: 1
-directory invalidation: 1
-opendir: 4
+ ....path:
+ ....node-creation:0
+ ....gitignore-invalidation:1
+ ....directory-invalidation:1
+ ....opendir:4
 EOF
-	test_cmp ../trace.expect ../trace
+	test_cmp ../trace.expect ../trace.relevant
 
 '
 
@@ -267,10 +406,9 @@ EOF
 '
 
 test_expect_success 'new info/exclude invalidates everything' '
-	avoid_racy &&
 	echo three >>.git/info/exclude &&
-	: >../trace &&
-	GIT_TRACE_UNTRACKED_STATS="$TRASH_DIRECTORY/trace" \
+	: >../trace.output &&
+	GIT_TRACE2_PERF="$TRASH_DIRECTORY/trace.output" \
 	git status --porcelain >../actual &&
 	iuc status --porcelain >../status.iuc &&
 	cat >../status.expect <<EOF &&
@@ -282,13 +420,15 @@ A  two
 EOF
 	test_cmp ../status.expect ../status.iuc &&
 	test_cmp ../status.expect ../actual &&
+	get_relevant_traces ../trace.output ../trace.relevant &&
 	cat >../trace.expect <<EOF &&
-node creation: 0
-gitignore invalidation: 1
-directory invalidation: 0
-opendir: 4
+ ....path:
+ ....node-creation:0
+ ....gitignore-invalidation:1
+ ....directory-invalidation:0
+ ....opendir:4
 EOF
-	test_cmp ../trace.expect ../trace
+	test_cmp ../trace.expect ../trace.relevant
 '
 
 test_expect_success 'verify untracked cache dump' '
@@ -327,8 +467,8 @@ EOF
 '
 
 test_expect_success 'status after the move' '
-	: >../trace &&
-	GIT_TRACE_UNTRACKED_STATS="$TRASH_DIRECTORY/trace" \
+	: >../trace.output &&
+	GIT_TRACE2_PERF="$TRASH_DIRECTORY/trace.output" \
 	git status --porcelain >../actual &&
 	iuc status --porcelain >../status.iuc &&
 	cat >../status.expect <<EOF &&
@@ -340,13 +480,15 @@ A  one
 EOF
 	test_cmp ../status.expect ../status.iuc &&
 	test_cmp ../status.expect ../actual &&
+	get_relevant_traces ../trace.output ../trace.relevant &&
 	cat >../trace.expect <<EOF &&
-node creation: 0
-gitignore invalidation: 0
-directory invalidation: 0
-opendir: 1
+ ....path:
+ ....node-creation:0
+ ....gitignore-invalidation:0
+ ....directory-invalidation:0
+ ....opendir:1
 EOF
-	test_cmp ../trace.expect ../trace
+	test_cmp ../trace.expect ../trace.relevant
 '
 
 test_expect_success 'verify untracked cache dump' '
@@ -386,8 +528,8 @@ EOF
 '
 
 test_expect_success 'status after the move' '
-	: >../trace &&
-	GIT_TRACE_UNTRACKED_STATS="$TRASH_DIRECTORY/trace" \
+	: >../trace.output &&
+	GIT_TRACE2_PERF="$TRASH_DIRECTORY/trace.output" \
 	git status --porcelain >../actual &&
 	iuc status --porcelain >../status.iuc &&
 	cat >../status.expect <<EOF &&
@@ -399,13 +541,15 @@ A  two
 EOF
 	test_cmp ../status.expect ../status.iuc &&
 	test_cmp ../status.expect ../actual &&
+	get_relevant_traces ../trace.output ../trace.relevant &&
 	cat >../trace.expect <<EOF &&
-node creation: 0
-gitignore invalidation: 0
-directory invalidation: 0
-opendir: 1
+ ....path:
+ ....node-creation:0
+ ....gitignore-invalidation:0
+ ....directory-invalidation:0
+ ....opendir:1
 EOF
-	test_cmp ../trace.expect ../trace
+	test_cmp ../trace.expect ../trace.relevant
 '
 
 test_expect_success 'verify untracked cache dump' '
@@ -435,8 +579,8 @@ test_expect_success 'set up for sparse checkout testing' '
 '
 
 test_expect_success 'status after commit' '
-	: >../trace &&
-	GIT_TRACE_UNTRACKED_STATS="$TRASH_DIRECTORY/trace" \
+	: >../trace.output &&
+	GIT_TRACE2_PERF="$TRASH_DIRECTORY/trace.output" \
 	git status --porcelain >../actual &&
 	iuc status --porcelain >../status.iuc &&
 	cat >../status.expect <<EOF &&
@@ -445,13 +589,15 @@ test_expect_success 'status after commit' '
 EOF
 	test_cmp ../status.expect ../status.iuc &&
 	test_cmp ../status.expect ../actual &&
+	get_relevant_traces ../trace.output ../trace.relevant &&
 	cat >../trace.expect <<EOF &&
-node creation: 0
-gitignore invalidation: 0
-directory invalidation: 0
-opendir: 2
+ ....path:
+ ....node-creation:0
+ ....gitignore-invalidation:0
+ ....directory-invalidation:0
+ ....opendir:2
 EOF
-	test_cmp ../trace.expect ../trace
+	test_cmp ../trace.expect ../trace.relevant
 '
 
 test_expect_success 'untracked cache correct after commit' '
@@ -475,7 +621,7 @@ EOF
 test_expect_success 'set up sparse checkout' '
 	echo "done/[a-z]*" >.git/info/sparse-checkout &&
 	test_config core.sparsecheckout true &&
-	git checkout master &&
+	git checkout main &&
 	git update-index --force-untracked-cache &&
 	git status --porcelain >/dev/null && # prime the cache
 	test_path_is_missing done/.gitignore &&
@@ -487,15 +633,15 @@ test_expect_success 'create/modify files, some of which are gitignored' '
 	echo three >done/three && # three is gitignored
 	echo four >done/four && # four is gitignored at a higher level
 	echo five >done/five && # five is not gitignored
-	echo test >base && #we need to ensure that the root dir is touched
-	rm base &&
+	test-tool chmtime =-180 done/two done/three done/four done/five done &&
+	# we need to ensure that the root dir is touched (in the past);
+	test-tool chmtime =-180 . &&
 	sync_mtime
 '
 
 test_expect_success 'test sparse status with untracked cache' '
-	: >../trace &&
-	avoid_racy &&
-	GIT_TRACE_UNTRACKED_STATS="$TRASH_DIRECTORY/trace" \
+	: >../trace.output &&
+	GIT_TRACE2_PERF="$TRASH_DIRECTORY/trace.output" \
 	git status --porcelain >../status.actual &&
 	iuc status --porcelain >../status.iuc &&
 	cat >../status.expect <<EOF &&
@@ -506,13 +652,15 @@ test_expect_success 'test sparse status with untracked cache' '
 EOF
 	test_cmp ../status.expect ../status.iuc &&
 	test_cmp ../status.expect ../status.actual &&
+	get_relevant_traces ../trace.output ../trace.relevant &&
 	cat >../trace.expect <<EOF &&
-node creation: 0
-gitignore invalidation: 1
-directory invalidation: 2
-opendir: 2
+ ....path:
+ ....node-creation:0
+ ....gitignore-invalidation:1
+ ....directory-invalidation:2
+ ....opendir:2
 EOF
-	test_cmp ../trace.expect ../trace
+	test_cmp ../trace.expect ../trace.relevant
 '
 
 test_expect_success 'untracked cache correct after status' '
@@ -535,9 +683,8 @@ EOF
 '
 
 test_expect_success 'test sparse status again with untracked cache' '
-	avoid_racy &&
-	: >../trace &&
-	GIT_TRACE_UNTRACKED_STATS="$TRASH_DIRECTORY/trace" \
+	: >../trace.output &&
+	GIT_TRACE2_PERF="$TRASH_DIRECTORY/trace.output" \
 	git status --porcelain >../status.actual &&
 	iuc status --porcelain >../status.iuc &&
 	cat >../status.expect <<EOF &&
@@ -548,25 +695,27 @@ test_expect_success 'test sparse status again with untracked cache' '
 EOF
 	test_cmp ../status.expect ../status.iuc &&
 	test_cmp ../status.expect ../status.actual &&
+	get_relevant_traces ../trace.output ../trace.relevant &&
 	cat >../trace.expect <<EOF &&
-node creation: 0
-gitignore invalidation: 0
-directory invalidation: 0
-opendir: 0
+ ....path:
+ ....node-creation:0
+ ....gitignore-invalidation:0
+ ....directory-invalidation:0
+ ....opendir:0
 EOF
-	test_cmp ../trace.expect ../trace
+	test_cmp ../trace.expect ../trace.relevant
 '
 
 test_expect_success 'set up for test of subdir and sparse checkouts' '
 	mkdir done/sub &&
 	mkdir done/sub/sub &&
-	echo "sub" > done/sub/sub/file
+	echo "sub" > done/sub/sub/file &&
+	test-tool chmtime =-120 done/sub/sub/file done/sub/sub done/sub done
 '
 
 test_expect_success 'test sparse status with untracked cache and subdir' '
-	avoid_racy &&
-	: >../trace &&
-	GIT_TRACE_UNTRACKED_STATS="$TRASH_DIRECTORY/trace" \
+	: >../trace.output &&
+	GIT_TRACE2_PERF="$TRASH_DIRECTORY/trace.output" \
 	git status --porcelain >../status.actual &&
 	iuc status --porcelain >../status.iuc &&
 	cat >../status.expect <<EOF &&
@@ -578,13 +727,15 @@ test_expect_success 'test sparse status with untracked cache and subdir' '
 EOF
 	test_cmp ../status.expect ../status.iuc &&
 	test_cmp ../status.expect ../status.actual &&
+	get_relevant_traces ../trace.output ../trace.relevant &&
 	cat >../trace.expect <<EOF &&
-node creation: 2
-gitignore invalidation: 0
-directory invalidation: 1
-opendir: 3
+ ....path:
+ ....node-creation:2
+ ....gitignore-invalidation:0
+ ....directory-invalidation:1
+ ....opendir:3
 EOF
-	test_cmp ../trace.expect ../trace
+	test_cmp ../trace.expect ../trace.relevant
 '
 
 test_expect_success 'verify untracked cache dump (sparse/subdirs)' '
@@ -612,20 +763,21 @@ EOF
 '
 
 test_expect_success 'test sparse status again with untracked cache and subdir' '
-	avoid_racy &&
-	: >../trace &&
-	GIT_TRACE_UNTRACKED_STATS="$TRASH_DIRECTORY/trace" \
+	: >../trace.output &&
+	GIT_TRACE2_PERF="$TRASH_DIRECTORY/trace.output" \
 	git status --porcelain >../status.actual &&
 	iuc status --porcelain >../status.iuc &&
 	test_cmp ../status.expect ../status.iuc &&
 	test_cmp ../status.expect ../status.actual &&
+	get_relevant_traces ../trace.output ../trace.relevant &&
 	cat >../trace.expect <<EOF &&
-node creation: 0
-gitignore invalidation: 0
-directory invalidation: 0
-opendir: 0
+ ....path:
+ ....node-creation:0
+ ....gitignore-invalidation:0
+ ....directory-invalidation:0
+ ....opendir:0
 EOF
-	test_cmp ../trace.expect ../trace
+	test_cmp ../trace.expect ../trace.relevant
 '
 
 test_expect_success 'move entry in subdir from untracked to cached' '
@@ -728,19 +880,19 @@ test_expect_success 'test ident field is working' '
 	cp -R done dthree dtwo four three ../other_worktree &&
 	GIT_WORK_TREE=../other_worktree git status 2>../err &&
 	echo "warning: untracked cache is disabled on this system or location" >../expect &&
-	test_i18ncmp ../expect ../err
+	test_cmp ../expect ../err
 '
 
 test_expect_success 'untracked cache survives a checkout' '
 	git commit --allow-empty -m empty &&
 	test-tool dump-untracked-cache >../before &&
-	test_when_finished  "git checkout master" &&
+	test_when_finished  "git checkout main" &&
 	git checkout -b other_branch &&
 	test-tool dump-untracked-cache >../after &&
 	test_cmp ../before ../after &&
 	test_commit test &&
 	test-tool dump-untracked-cache >../before &&
-	git checkout master &&
+	git checkout main &&
 	test-tool dump-untracked-cache >../after &&
 	test_cmp ../before ../after
 '
@@ -775,7 +927,7 @@ test_expect_success SYMLINKS '"status" after symlink replacement should be clean
 	git checkout HEAD~ &&
 	status_is_clean &&
 	status_is_clean &&
-	git checkout master &&
+	git checkout main &&
 	avoid_racy &&
 	status_is_clean &&
 	status_is_clean
@@ -786,7 +938,7 @@ test_expect_success SYMLINKS '"status" after symlink replacement should be clean
 	git checkout HEAD~ &&
 	status_is_clean &&
 	status_is_clean &&
-	git checkout master &&
+	git checkout main &&
 	avoid_racy &&
 	status_is_clean &&
 	status_is_clean
@@ -810,7 +962,7 @@ test_expect_success '"status" after file replacement should be clean with UC=tru
 	git checkout HEAD~ &&
 	status_is_clean &&
 	status_is_clean &&
-	git checkout master &&
+	git checkout main &&
 	avoid_racy &&
 	status_is_clean &&
 	test-tool dump-untracked-cache >../actual &&
@@ -828,10 +980,15 @@ test_expect_success '"status" after file replacement should be clean with UC=fal
 	git checkout HEAD~ &&
 	status_is_clean &&
 	status_is_clean &&
-	git checkout master &&
+	git checkout main &&
 	avoid_racy &&
 	status_is_clean &&
 	status_is_clean
 '
 
+test_expect_success 'empty repo (no index) and core.untrackedCache' '
+	git init emptyrepo &&
+	git -C emptyrepo -c core.untrackedCache=true write-tree
+'
+
 test_done
diff --git a/t/t7064-wtstatus-pv2.sh b/t/t7064-wtstatus-pv2.sh
index 537787e..11884d2 100755
--- a/t/t7064-wtstatus-pv2.sh
+++ b/t/t7064-wtstatus-pv2.sh
@@ -4,11 +4,11 @@ test_description='git status --porcelain=v2
 
 This test exercises porcelain V2 output for git status.'
 
-
 . ./test-lib.sh
 
 
 test_expect_success setup '
+	git checkout -f --orphan initial-branch &&
 	test_tick &&
 	git config core.autocrlf false &&
 	echo x >file_x &&
@@ -22,7 +22,7 @@ test_expect_success setup '
 test_expect_success 'before initial commit, nothing added, only untracked' '
 	cat >expect <<-EOF &&
 	# branch.oid (initial)
-	# branch.head master
+	# branch.head initial-branch
 	? actual
 	? dir1/
 	? expect
@@ -45,7 +45,7 @@ test_expect_success 'before initial commit, things added' '
 
 	cat >expect <<-EOF &&
 	# branch.oid (initial)
-	# branch.head master
+	# branch.head initial-branch
 	1 A. N... 000000 100644 100644 $ZERO_OID $OID_A dir1/file_a
 	1 A. N... 000000 100644 100644 $ZERO_OID $OID_B dir1/file_b
 	1 A. N... 000000 100644 100644 $ZERO_OID $OID_X file_x
@@ -62,7 +62,7 @@ test_expect_success 'before initial commit, things added' '
 test_expect_success 'before initial commit, things added (-z)' '
 	lf_to_nul >expect <<-EOF &&
 	# branch.oid (initial)
-	# branch.head master
+	# branch.head initial-branch
 	1 A. N... 000000 100644 100644 $ZERO_OID $OID_A dir1/file_a
 	1 A. N... 000000 100644 100644 $ZERO_OID $OID_B dir1/file_b
 	1 A. N... 000000 100644 100644 $ZERO_OID $OID_X file_x
@@ -81,7 +81,7 @@ test_expect_success 'make first commit, comfirm HEAD oid and branch' '
 	H0=$(git rev-parse HEAD) &&
 	cat >expect <<-EOF &&
 	# branch.oid $H0
-	# branch.head master
+	# branch.head initial-branch
 	? actual
 	? expect
 	EOF
@@ -98,7 +98,7 @@ test_expect_success 'after first commit, create unstaged changes' '
 
 	cat >expect <<-EOF &&
 	# branch.oid $H0
-	# branch.head master
+	# branch.head initial-branch
 	1 .M N... 100644 100644 100644 $OID_X $OID_X file_x
 	1 .D N... 100644 100644 000000 $OID_Z $OID_Z file_z
 	? actual
@@ -109,6 +109,21 @@ test_expect_success 'after first commit, create unstaged changes' '
 	test_cmp expect actual
 '
 
+test_expect_success 'after first commit, stash existing changes' '
+	cat >expect <<-EOF &&
+	# branch.oid $H0
+	# branch.head initial-branch
+	# stash 2
+	EOF
+
+	test_when_finished "git stash pop && git stash pop" &&
+
+	git stash -- file_x &&
+	git stash &&
+	git status --porcelain=v2 --branch --show-stash --untracked-files=no >actual &&
+	test_cmp expect actual
+'
+
 test_expect_success 'after first commit but omit untracked files and branch' '
 	cat >expect <<-EOF &&
 	1 .M N... 100644 100644 100644 $OID_X $OID_X file_x
@@ -126,7 +141,7 @@ test_expect_success 'after first commit, stage existing changes' '
 
 	cat >expect <<-EOF &&
 	# branch.oid $H0
-	# branch.head master
+	# branch.head initial-branch
 	1 M. N... 100644 100644 100644 $OID_X $OID_X1 file_x
 	1 D. N... 100644 000000 000000 $OID_Z $ZERO_OID file_z
 	? actual
@@ -143,7 +158,7 @@ test_expect_success 'rename causes 2 path lines' '
 
 	q_to_tab >expect <<-EOF &&
 	# branch.oid $H0
-	# branch.head master
+	# branch.head initial-branch
 	1 M. N... 100644 100644 100644 $OID_X $OID_X1 file_x
 	1 D. N... 100644 000000 000000 $OID_Z $ZERO_OID file_z
 	2 R. N... 100644 100644 100644 $OID_Y $OID_Y R100 renamed_yQfile_y
@@ -161,7 +176,7 @@ test_expect_success 'rename causes 2 path lines (-z)' '
 	## Lines use NUL path separator and line terminator, so double transform here.
 	q_to_nul <<-EOF | lf_to_nul >expect &&
 	# branch.oid $H0
-	# branch.head master
+	# branch.head initial-branch
 	1 M. N... 100644 100644 100644 $OID_X $OID_X1 file_x
 	1 D. N... 100644 000000 000000 $OID_Z $ZERO_OID file_z
 	2 R. N... 100644 100644 100644 $OID_Y $OID_Y R100 renamed_yQfile_y
@@ -179,7 +194,7 @@ test_expect_success 'make second commit, confirm clean and new HEAD oid' '
 
 	cat >expect <<-EOF &&
 	# branch.oid $H1
-	# branch.head master
+	# branch.head initial-branch
 	? actual
 	? expect
 	EOF
@@ -231,7 +246,7 @@ test_expect_success 'create and commit permanent ignore file' '
 
 	cat >expect <<-EOF &&
 	# branch.oid $H1
-	# branch.head master
+	# branch.head initial-branch
 	EOF
 
 	git status --porcelain=v2 --branch >actual &&
@@ -257,14 +272,14 @@ test_expect_success 'verify --intent-to-add output' '
 test_expect_success 'verify AA (add-add) conflict' '
 	test_when_finished "git reset --hard" &&
 
-	git branch AA_A master &&
+	git branch AA_A initial-branch &&
 	git checkout AA_A &&
 	echo "Branch AA_A" >conflict.txt &&
 	OID_AA_A=$(git hash-object -t blob -- conflict.txt) &&
 	git add conflict.txt &&
 	git commit -m "branch aa_a" &&
 
-	git branch AA_B master &&
+	git branch AA_B initial-branch &&
 	git checkout AA_B &&
 	echo "Branch AA_B" >conflict.txt &&
 	OID_AA_B=$(git hash-object -t blob -- conflict.txt) &&
@@ -290,7 +305,7 @@ test_expect_success 'verify AA (add-add) conflict' '
 test_expect_success 'verify UU (edit-edit) conflict' '
 	test_when_finished "git reset --hard" &&
 
-	git branch UU_ANC master &&
+	git branch UU_ANC initial-branch &&
 	git checkout UU_ANC &&
 	echo "Ancestor" >conflict.txt &&
 	OID_UU_ANC=$(git hash-object -t blob -- conflict.txt) &&
@@ -328,18 +343,18 @@ test_expect_success 'verify UU (edit-edit) conflict' '
 '
 
 test_expect_success 'verify upstream fields in branch header' '
-	git checkout master &&
+	git checkout initial-branch &&
 	test_when_finished "rm -rf sub_repo" &&
 	git clone . sub_repo &&
 	(
-		## Confirm local master tracks remote master.
+		## Confirm local initial-branch tracks remote initial-branch.
 		cd sub_repo &&
 		HUF=$(git rev-parse HEAD) &&
 
 		cat >expect <<-EOF &&
 		# branch.oid $HUF
-		# branch.head master
-		# branch.upstream origin/master
+		# branch.head initial-branch
+		# branch.upstream origin/initial-branch
 		# branch.ab +0 -0
 		EOF
 
@@ -355,8 +370,8 @@ test_expect_success 'verify upstream fields in branch header' '
 
 		cat >expect <<-EOF &&
 		# branch.oid $HUF
-		# branch.head master
-		# branch.upstream origin/master
+		# branch.head initial-branch
+		# branch.upstream origin/initial-branch
 		# branch.ab +1 -0
 		EOF
 
@@ -367,19 +382,16 @@ test_expect_success 'verify upstream fields in branch header' '
 		git status --porcelain=v2 --untracked-files=all >actual &&
 		test_must_be_empty actual &&
 
-		## Test upstream-gone case. Fake this by pointing origin/master at
-		## a non-existing commit.
-		OLD=$(git rev-parse origin/master) &&
-		NEW=$ZERO_OID &&
-		mv .git/packed-refs .git/old-packed-refs &&
-		sed "s/$OLD/$NEW/g" <.git/old-packed-refs >.git/packed-refs &&
+		## Test upstream-gone case. Fake this by pointing
+		## origin/initial-branch at a non-existing commit.
+		git update-ref -d refs/remotes/origin/initial-branch &&
 
 		HUF=$(git rev-parse HEAD) &&
 
 		cat >expect <<-EOF &&
 		# branch.oid $HUF
-		# branch.head master
-		# branch.upstream origin/master
+		# branch.head initial-branch
+		# branch.upstream origin/initial-branch
 		EOF
 
 		git status --porcelain=v2 --branch --untracked-files=all >actual &&
@@ -388,19 +400,19 @@ test_expect_success 'verify upstream fields in branch header' '
 '
 
 test_expect_success 'verify --[no-]ahead-behind with V2 format' '
-	git checkout master &&
+	git checkout initial-branch &&
 	test_when_finished "rm -rf sub_repo" &&
 	git clone . sub_repo &&
 	(
-		## Confirm local master tracks remote master.
+		## Confirm local initial-branch tracks remote initial-branch.
 		cd sub_repo &&
 		HUF=$(git rev-parse HEAD) &&
 
 		# Confirm --no-ahead-behind reports traditional branch.ab with 0/0 for equal branches.
 		cat >expect <<-EOF &&
 		# branch.oid $HUF
-		# branch.head master
-		# branch.upstream origin/master
+		# branch.head initial-branch
+		# branch.upstream origin/initial-branch
 		# branch.ab +0 -0
 		EOF
 
@@ -410,8 +422,8 @@ test_expect_success 'verify --[no-]ahead-behind with V2 format' '
 		# Confirm --ahead-behind reports traditional branch.ab with 0/0.
 		cat >expect <<-EOF &&
 		# branch.oid $HUF
-		# branch.head master
-		# branch.upstream origin/master
+		# branch.head initial-branch
+		# branch.upstream origin/initial-branch
 		# branch.ab +0 -0
 		EOF
 
@@ -428,8 +440,8 @@ test_expect_success 'verify --[no-]ahead-behind with V2 format' '
 		# Confirm --no-ahead-behind reports branch.ab with ?/? for non-equal branches.
 		cat >expect <<-EOF &&
 		# branch.oid $HUF
-		# branch.head master
-		# branch.upstream origin/master
+		# branch.head initial-branch
+		# branch.upstream origin/initial-branch
 		# branch.ab +? -?
 		EOF
 
@@ -439,8 +451,8 @@ test_expect_success 'verify --[no-]ahead-behind with V2 format' '
 		# Confirm --ahead-behind reports traditional branch.ab with 1/0.
 		cat >expect <<-EOF &&
 		# branch.oid $HUF
-		# branch.head master
-		# branch.upstream origin/master
+		# branch.head initial-branch
+		# branch.upstream origin/initial-branch
 		# branch.ab +1 -0
 		EOF
 
@@ -458,9 +470,10 @@ test_expect_success 'verify --[no-]ahead-behind with V2 format' '
 '
 
 test_expect_success 'create and add submodule, submodule appears clean (A. S...)' '
-	git checkout master &&
+	git checkout initial-branch &&
 	git clone . sub_repo &&
 	git clone . super_repo &&
+	test_config_global protocol.file.allow always &&
 	(	cd super_repo &&
 		git submodule add ../sub_repo sub1 &&
 
@@ -471,8 +484,8 @@ test_expect_success 'create and add submodule, submodule appears clean (A. S...)
 
 		cat >expect <<-EOF &&
 		# branch.oid $HSUP
-		# branch.head master
-		# branch.upstream origin/master
+		# branch.head initial-branch
+		# branch.upstream origin/initial-branch
 		# branch.ab +0 -0
 		1 A. N... 000000 100644 100644 $ZERO_OID $HMOD .gitmodules
 		1 A. S... 000000 160000 160000 $ZERO_OID $HSUB sub1
@@ -496,8 +509,8 @@ test_expect_success 'untracked changes in added submodule (AM S..U)' '
 
 		cat >expect <<-EOF &&
 		# branch.oid $HSUP
-		# branch.head master
-		# branch.upstream origin/master
+		# branch.head initial-branch
+		# branch.upstream origin/initial-branch
 		# branch.ab +0 -0
 		1 A. N... 000000 100644 100644 $ZERO_OID $HMOD .gitmodules
 		1 AM S..U 000000 160000 160000 $ZERO_OID $HSUB sub1
@@ -521,8 +534,8 @@ test_expect_success 'staged changes in added submodule (AM S.M.)' '
 
 		cat >expect <<-EOF &&
 		# branch.oid $HSUP
-		# branch.head master
-		# branch.upstream origin/master
+		# branch.head initial-branch
+		# branch.upstream origin/initial-branch
 		# branch.ab +0 -0
 		1 A. N... 000000 100644 100644 $ZERO_OID $HMOD .gitmodules
 		1 AM S.M. 000000 160000 160000 $ZERO_OID $HSUB sub1
@@ -548,8 +561,8 @@ test_expect_success 'staged and unstaged changes in added (AM S.M.)' '
 
 		cat >expect <<-EOF &&
 		# branch.oid $HSUP
-		# branch.head master
-		# branch.upstream origin/master
+		# branch.head initial-branch
+		# branch.upstream origin/initial-branch
 		# branch.ab +0 -0
 		1 A. N... 000000 100644 100644 $ZERO_OID $HMOD .gitmodules
 		1 AM S.M. 000000 160000 160000 $ZERO_OID $HSUB sub1
@@ -575,8 +588,8 @@ test_expect_success 'staged and untracked changes in added submodule (AM S.MU)'
 
 		cat >expect <<-EOF &&
 		# branch.oid $HSUP
-		# branch.head master
-		# branch.upstream origin/master
+		# branch.head initial-branch
+		# branch.upstream origin/initial-branch
 		# branch.ab +0 -0
 		1 A. N... 000000 100644 100644 $ZERO_OID $HMOD .gitmodules
 		1 AM S.MU 000000 160000 160000 $ZERO_OID $HSUB sub1
@@ -602,8 +615,8 @@ test_expect_success 'commit within the submodule appears as new commit in super
 
 		cat >expect <<-EOF &&
 		# branch.oid $HSUP
-		# branch.head master
-		# branch.upstream origin/master
+		# branch.head initial-branch
+		# branch.upstream origin/initial-branch
 		# branch.ab +0 -0
 		1 A. N... 000000 100644 100644 $ZERO_OID $HMOD .gitmodules
 		1 AM SC.. 000000 160000 160000 $ZERO_OID $HSUB sub1
@@ -625,8 +638,8 @@ test_expect_success 'stage submodule in super and commit' '
 
 		cat >expect <<-EOF &&
 		# branch.oid $HSUP
-		# branch.head master
-		# branch.upstream origin/master
+		# branch.head initial-branch
+		# branch.upstream origin/initial-branch
 		# branch.ab +1 -0
 		EOF
 
@@ -646,8 +659,8 @@ test_expect_success 'make unstaged changes in existing submodule (.M S.M.)' '
 
 		cat >expect <<-EOF &&
 		# branch.oid $HSUP
-		# branch.head master
-		# branch.upstream origin/master
+		# branch.head initial-branch
+		# branch.upstream origin/initial-branch
 		# branch.ab +1 -0
 		1 .M S.M. 160000 160000 160000 $HSUB $HSUB sub1
 		EOF
diff --git a/t/t7101-reset-empty-subdirs.sh b/t/t7101-reset-empty-subdirs.sh
index 96e163f..89cf98b 100755
--- a/t/t7101-reset-empty-subdirs.sh
+++ b/t/t7101-reset-empty-subdirs.sh
@@ -4,60 +4,63 @@
 #
 
 test_description='git reset should cull empty subdirs'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-diff-data.sh
+
+test_expect_success 'creating initial files' '
+	mkdir path0 &&
+	COPYING_test_data >path0/COPYING &&
+	git add path0/COPYING &&
+	git commit -m add -a
+'
+
+test_expect_success 'creating second files' '
+	mkdir path1 &&
+	mkdir path1/path2 &&
+	COPYING_test_data >path1/path2/COPYING &&
+	COPYING_test_data >path1/COPYING &&
+	COPYING_test_data >COPYING &&
+	COPYING_test_data >path0/COPYING-TOO &&
+	git add path1/path2/COPYING &&
+	git add path1/COPYING &&
+	git add COPYING &&
+	git add path0/COPYING-TOO &&
+	git commit -m change -a
+'
+
+test_expect_success 'resetting tree HEAD^' '
+	git reset --hard HEAD^
+'
+
+test_expect_success 'checking initial files exist after rewind' '
+	test -d path0 &&
+	test -f path0/COPYING
+'
+
+test_expect_success 'checking lack of path1/path2/COPYING' '
+	! test -f path1/path2/COPYING
+'
+
+test_expect_success 'checking lack of path1/COPYING' '
+	! test -f path1/COPYING
+'
+
+test_expect_success 'checking lack of COPYING' '
+	! test -f COPYING
+'
+
+test_expect_success 'checking checking lack of path1/COPYING-TOO' '
+	! test -f path0/COPYING-TOO
+'
+
+test_expect_success 'checking lack of path1/path2' '
+	! test -d path1/path2
+'
 
-test_expect_success \
-    'creating initial files' \
-    'mkdir path0 &&
-     cp "$TEST_DIRECTORY"/../COPYING path0/COPYING &&
-     git add path0/COPYING &&
-     git commit -m add -a'
-
-test_expect_success \
-    'creating second files' \
-    'mkdir path1 &&
-     mkdir path1/path2 &&
-     cp "$TEST_DIRECTORY"/../COPYING path1/path2/COPYING &&
-     cp "$TEST_DIRECTORY"/../COPYING path1/COPYING &&
-     cp "$TEST_DIRECTORY"/../COPYING COPYING &&
-     cp "$TEST_DIRECTORY"/../COPYING path0/COPYING-TOO &&
-     git add path1/path2/COPYING &&
-     git add path1/COPYING &&
-     git add COPYING &&
-     git add path0/COPYING-TOO &&
-     git commit -m change -a'
-
-test_expect_success \
-    'resetting tree HEAD^' \
-    'git reset --hard HEAD^'
-
-test_expect_success \
-    'checking initial files exist after rewind' \
-    'test -d path0 &&
-     test -f path0/COPYING'
-
-test_expect_success \
-    'checking lack of path1/path2/COPYING' \
-    '! test -f path1/path2/COPYING'
-
-test_expect_success \
-    'checking lack of path1/COPYING' \
-    '! test -f path1/COPYING'
-
-test_expect_success \
-    'checking lack of COPYING' \
-    '! test -f COPYING'
-
-test_expect_success \
-    'checking checking lack of path1/COPYING-TOO' \
-    '! test -f path0/COPYING-TOO'
-
-test_expect_success \
-    'checking lack of path1/path2' \
-    '! test -d path1/path2'
-
-test_expect_success \
-    'checking lack of path1' \
-    '! test -d path1'
+test_expect_success 'checking lack of path1' '
+	! test -d path1
+'
 
 test_done
diff --git a/t/t7102-reset.sh b/t/t7102-reset.sh
index 22161b3..62d9f84 100755
--- a/t/t7102-reset.sh
+++ b/t/t7102-reset.sh
@@ -7,6 +7,9 @@ test_description='git reset
 
 Documented tests for git reset'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 commit_msg () {
@@ -68,29 +71,39 @@ check_changes () {
 	done | test_cmp .cat_expect -
 }
 
+# no negated form for various type of resets
+for opt in soft mixed hard merge keep
+do
+	test_expect_success "no 'git reset --no-$opt'" '
+		test_when_finished "rm -f err" &&
+		test_must_fail git reset --no-$opt 2>err &&
+		grep "error: unknown option .no-$opt." err
+	'
+done
+
 test_expect_success 'reset --hard message' '
 	hex=$(git log -1 --format="%h") &&
-	git reset --hard > .actual &&
-	echo HEAD is now at $hex $(commit_msg) > .expected &&
-	test_i18ncmp .expected .actual
+	git reset --hard >.actual &&
+	echo HEAD is now at $hex $(commit_msg) >.expected &&
+	test_cmp .expected .actual
 '
 
 test_expect_success 'reset --hard message (ISO8859-1 logoutputencoding)' '
 	hex=$(git log -1 --format="%h") &&
-	git -c "i18n.logOutputEncoding=$test_encoding" reset --hard > .actual &&
-	echo HEAD is now at $hex $(commit_msg $test_encoding) > .expected &&
-	test_i18ncmp .expected .actual
+	git -c "i18n.logOutputEncoding=$test_encoding" reset --hard >.actual &&
+	echo HEAD is now at $hex $(commit_msg $test_encoding) >.expected &&
+	test_cmp .expected .actual
 '
 
->.diff_expect
->.cached_expect
-cat >.cat_expect <<EOF
-secondfile:
-1st line 2nd file
-2nd line 2nd file
-EOF
-
 test_expect_success 'giving a non existing revision should fail' '
+	>.diff_expect &&
+	>.cached_expect &&
+	cat >.cat_expect <<-\EOF &&
+	secondfile:
+	1st line 2nd file
+	2nd line 2nd file
+	EOF
+
 	test_must_fail git reset aaaaaa &&
 	test_must_fail git reset --mixed aaaaaa &&
 	test_must_fail git reset --soft aaaaaa &&
@@ -107,8 +120,7 @@ test_expect_success 'reset --soft with unmerged index should fail' '
 	git rm --cached -- un
 '
 
-test_expect_success \
-	'giving paths with options different than --mixed should fail' '
+test_expect_success 'giving paths with options different than --mixed should fail' '
 	test_must_fail git reset --soft -- first &&
 	test_must_fail git reset --hard -- first &&
 	test_must_fail git reset --soft HEAD^ -- first &&
@@ -128,8 +140,7 @@ test_expect_success 'giving unrecognized options should fail' '
 	check_changes $head5
 '
 
-test_expect_success \
-	'trying to do reset --soft with pending merge should fail' '
+test_expect_success 'trying to do reset --soft with pending merge should fail' '
 	git branch branch1 &&
 	git branch branch2 &&
 
@@ -147,13 +158,12 @@ test_expect_success \
 	printf "1st line 2nd file\n2nd line 2nd file\n3rd line" >secondfile &&
 	git commit -a -m "the change in branch2" &&
 
-	git checkout master &&
+	git checkout main &&
 	git branch -D branch1 branch2 &&
 	check_changes $head5
 '
 
-test_expect_success \
-	'trying to do reset --soft with pending checkout merge should fail' '
+test_expect_success 'trying to do reset --soft with pending checkout merge should fail' '
 	git branch branch3 &&
 	git branch branch4 &&
 
@@ -170,13 +180,12 @@ test_expect_success \
 	printf "1st line 2nd file\n2nd line 2nd file\n3rd line" >secondfile &&
 	git commit -a -m "the line in branch3" &&
 
-	git checkout master &&
+	git checkout main &&
 	git branch -D branch3 branch4 &&
 	check_changes $head5
 '
 
-test_expect_success \
-	'resetting to HEAD with no changes should succeed and do nothing' '
+test_expect_success 'resetting to HEAD with no changes should succeed and do nothing' '
 	git reset --hard &&
 		check_changes $head5 &&
 	git reset --hard HEAD &&
@@ -195,39 +204,38 @@ test_expect_success \
 		check_changes $head5
 '
 
->.diff_expect
-cat >.cached_expect <<EOF
-diff --git a/secondfile b/secondfile
-index $head5p1s..$head5s 100644
---- a/secondfile
-+++ b/secondfile
-@@ -1 +1,2 @@
--2nd file
-+1st line 2nd file
-+2nd line 2nd file
-EOF
-cat >.cat_expect <<EOF
-secondfile:
-1st line 2nd file
-2nd line 2nd file
-EOF
 test_expect_success '--soft reset only should show changes in diff --cached' '
+	>.diff_expect &&
+	cat >.cached_expect <<-EOF &&
+	diff --git a/secondfile b/secondfile
+	index $head5p1s..$head5s 100644
+	--- a/secondfile
+	+++ b/secondfile
+	@@ -1 +1,2 @@
+	-2nd file
+	+1st line 2nd file
+	+2nd line 2nd file
+	EOF
+	cat >.cat_expect <<-\EOF &&
+	secondfile:
+	1st line 2nd file
+	2nd line 2nd file
+	EOF
 	git reset --soft HEAD^ &&
 	check_changes $head5p1 &&
 	test "$(git rev-parse ORIG_HEAD)" = \
 			$head5
 '
 
->.diff_expect
->.cached_expect
-cat >.cat_expect <<EOF
-secondfile:
-1st line 2nd file
-2nd line 2nd file
-3rd line 2nd file
-EOF
-test_expect_success \
-	'changing files and redo the last commit should succeed' '
+test_expect_success 'changing files and redo the last commit should succeed' '
+	>.diff_expect &&
+	>.cached_expect &&
+	cat >.cat_expect <<-\EOF &&
+	secondfile:
+	1st line 2nd file
+	2nd line 2nd file
+	3rd line 2nd file
+	EOF
 	echo "3rd line 2nd file" >>secondfile &&
 	git commit -a -C ORIG_HEAD &&
 	head4=$(git rev-parse --verify HEAD) &&
@@ -236,56 +244,54 @@ test_expect_success \
 			$head5
 '
 
->.diff_expect
->.cached_expect
-cat >.cat_expect <<EOF
-first:
-1st file
-2nd line 1st file
-second:
-2nd file
-EOF
-test_expect_success \
-	'--hard reset should change the files and undo commits permanently' '
+test_expect_success '--hard reset should change the files and undo commits permanently' '
+	>.diff_expect &&
+	>.cached_expect &&
+	cat >.cat_expect <<-\EOF &&
+	first:
+	1st file
+	2nd line 1st file
+	second:
+	2nd file
+	EOF
 	git reset --hard HEAD~2 &&
 	check_changes $head5p2 &&
 	test "$(git rev-parse ORIG_HEAD)" = \
 			$head4
 '
 
->.diff_expect
-cat >.cached_expect <<EOF
-diff --git a/first b/first
-deleted file mode 100644
-index $head5p2f..0000000
---- a/first
-+++ /dev/null
-@@ -1,2 +0,0 @@
--1st file
--2nd line 1st file
-diff --git a/second b/second
-deleted file mode 100644
-index $head5p1s..0000000
---- a/second
-+++ /dev/null
-@@ -1 +0,0 @@
--2nd file
-diff --git a/secondfile b/secondfile
-new file mode 100644
-index 0000000..$head5s
---- /dev/null
-+++ b/secondfile
-@@ -0,0 +1,2 @@
-+1st line 2nd file
-+2nd line 2nd file
-EOF
-cat >.cat_expect <<EOF
-secondfile:
-1st line 2nd file
-2nd line 2nd file
-EOF
-test_expect_success \
-	'redoing changes adding them without commit them should succeed' '
+test_expect_success 'redoing changes adding them without commit them should succeed' '
+	>.diff_expect &&
+	cat >.cached_expect <<-EOF &&
+	diff --git a/first b/first
+	deleted file mode 100644
+	index $head5p2f..0000000
+	--- a/first
+	+++ /dev/null
+	@@ -1,2 +0,0 @@
+	-1st file
+	-2nd line 1st file
+	diff --git a/second b/second
+	deleted file mode 100644
+	index $head5p1s..0000000
+	--- a/second
+	+++ /dev/null
+	@@ -1 +0,0 @@
+	-2nd file
+	diff --git a/secondfile b/secondfile
+	new file mode 100644
+	index 0000000..$head5s
+	--- /dev/null
+	+++ b/secondfile
+	@@ -0,0 +1,2 @@
+	+1st line 2nd file
+	+2nd line 2nd file
+	EOF
+	cat >.cat_expect <<-\EOF &&
+	secondfile:
+	1st line 2nd file
+	2nd line 2nd file
+	EOF
 	git rm first &&
 	git mv second secondfile &&
 
@@ -295,46 +301,45 @@ test_expect_success \
 	check_changes $head5p2
 '
 
-cat >.diff_expect <<EOF
-diff --git a/first b/first
-deleted file mode 100644
-index $head5p2f..0000000
---- a/first
-+++ /dev/null
-@@ -1,2 +0,0 @@
--1st file
--2nd line 1st file
-diff --git a/second b/second
-deleted file mode 100644
-index $head5p1s..0000000
---- a/second
-+++ /dev/null
-@@ -1 +0,0 @@
--2nd file
-EOF
->.cached_expect
-cat >.cat_expect <<EOF
-secondfile:
-1st line 2nd file
-2nd line 2nd file
-EOF
 test_expect_success '--mixed reset to HEAD should unadd the files' '
+	cat >.diff_expect <<-EOF &&
+	diff --git a/first b/first
+	deleted file mode 100644
+	index $head5p2f..0000000
+	--- a/first
+	+++ /dev/null
+	@@ -1,2 +0,0 @@
+	-1st file
+	-2nd line 1st file
+	diff --git a/second b/second
+	deleted file mode 100644
+	index $head5p1s..0000000
+	--- a/second
+	+++ /dev/null
+	@@ -1 +0,0 @@
+	-2nd file
+	EOF
+	>.cached_expect &&
+	cat >.cat_expect <<-\EOF &&
+	secondfile:
+	1st line 2nd file
+	2nd line 2nd file
+	EOF
 	git reset &&
 	check_changes $head5p2 &&
 	test "$(git rev-parse ORIG_HEAD)" = $head5p2
 '
 
->.diff_expect
->.cached_expect
-cat >.cat_expect <<EOF
-secondfile:
-1st line 2nd file
-2nd line 2nd file
-EOF
 test_expect_success 'redoing the last two commits should succeed' '
+	>.diff_expect &&
+	>.cached_expect &&
+	cat >.cat_expect <<-\EOF &&
+	secondfile:
+	1st line 2nd file
+	2nd line 2nd file
+	EOF
 	git add secondfile &&
 	git reset --hard $head5p2 &&
-
 	git rm first &&
 	git mv second secondfile &&
 	git commit -a -m "remove 1st and rename 2nd" &&
@@ -347,15 +352,15 @@ test_expect_success 'redoing the last two commits should succeed' '
 	check_changes $head5
 '
 
->.diff_expect
->.cached_expect
-cat >.cat_expect <<EOF
-secondfile:
-1st line 2nd file
-2nd line 2nd file
-3rd line in branch2
-EOF
 test_expect_success '--hard reset to HEAD should clear a failed merge' '
+	>.diff_expect &&
+	>.cached_expect &&
+	cat >.cat_expect <<-\EOF &&
+	secondfile:
+	1st line 2nd file
+	2nd line 2nd file
+	3rd line in branch2
+	EOF
 	git branch branch1 &&
 	git branch branch2 &&
 
@@ -373,15 +378,14 @@ test_expect_success '--hard reset to HEAD should clear a failed merge' '
 	check_changes $head3
 '
 
->.diff_expect
->.cached_expect
-cat >.cat_expect <<EOF
-secondfile:
-1st line 2nd file
-2nd line 2nd file
-EOF
-test_expect_success \
-	'--hard reset to ORIG_HEAD should clear a fast-forward merge' '
+test_expect_success '--hard reset to ORIG_HEAD should clear a fast-forward merge' '
+	>.diff_expect &&
+	>.cached_expect &&
+	cat >.cat_expect <<-\EOF &&
+	secondfile:
+	1st line 2nd file
+	2nd line 2nd file
+	EOF
 	git reset --hard HEAD^ &&
 	check_changes $head5 &&
 
@@ -389,31 +393,31 @@ test_expect_success \
 	git reset --hard ORIG_HEAD &&
 	check_changes $head5 &&
 
-	git checkout master &&
+	git checkout main &&
 	git branch -D branch1 branch2 &&
 	check_changes $head5
 '
 
 test_expect_success 'test --mixed <paths>' '
-	echo 1 > file1 &&
-	echo 2 > file2 &&
+	echo 1 >file1 &&
+	echo 2 >file2 &&
 	git add file1 file2 &&
 	test_tick &&
 	git commit -m files &&
 	before1=$(git rev-parse --short HEAD:file1) &&
 	before2=$(git rev-parse --short HEAD:file2) &&
 	git rm file2 &&
-	echo 3 > file3 &&
-	echo 4 > file4 &&
-	echo 5 > file1 &&
+	echo 3 >file3 &&
+	echo 4 >file4 &&
+	echo 5 >file1 &&
 	after1=$(git rev-parse --short $(git hash-object file1)) &&
 	after4=$(git rev-parse --short $(git hash-object file4)) &&
 	git add file1 file3 file4 &&
 	git reset HEAD -- file1 file2 file3 &&
 	test_must_fail git diff --quiet &&
-	git diff > output &&
+	git diff >output &&
 
-	cat > expect <<-EOF &&
+	cat >expect <<-EOF &&
 	diff --git a/file1 b/file1
 	index $before1..$after1 100644
 	--- a/file1
@@ -431,9 +435,9 @@ test_expect_success 'test --mixed <paths>' '
 	EOF
 
 	test_cmp expect output &&
-	git diff --cached > output &&
+	git diff --cached >output &&
 
-	cat > cached_expect <<-EOF &&
+	cat >cached_expect <<-EOF &&
 	diff --git a/file4 b/file4
 	new file mode 100644
 	index 0000000..$after4
@@ -447,7 +451,6 @@ test_expect_success 'test --mixed <paths>' '
 '
 
 test_expect_success 'test resetting the index at give paths' '
-
 	mkdir sub &&
 	>sub/file1 &&
 	>sub/file2 &&
@@ -460,7 +463,6 @@ test_expect_success 'test resetting the index at give paths' '
 	echo "$U" &&
 	test_must_fail git diff-index --cached --exit-code "$T" &&
 	test "$T" != "$U"
-
 '
 
 test_expect_success 'resetting an unmodified path is a no-op' '
@@ -470,15 +472,57 @@ test_expect_success 'resetting an unmodified path is a no-op' '
 	git diff-index --cached --exit-code HEAD
 '
 
-cat > expect << EOF
-Unstaged changes after reset:
-M	file2
-EOF
+test_reset_refreshes_index () {
+
+	# To test whether the index is refreshed in `git reset --mixed` with
+	# the given options, create a scenario where we clearly see different
+	# results depending on whether the refresh occurred or not.
+
+	# Step 0: start with a clean index
+	git reset --hard HEAD &&
+
+	# Step 1: remove file2, but only in the index (no change to worktree)
+	git rm --cached file2 &&
+
+	# Step 2: reset index & leave worktree unchanged from HEAD
+	git $1 reset $2 --mixed HEAD &&
+
+	# Step 3: verify whether the index is refreshed by checking whether
+	# file2 still has staged changes in the index differing from HEAD (if
+	# the refresh occurred, there should be no such changes)
+	git diff-files >output.log &&
+	test_must_be_empty output.log
+}
 
 test_expect_success '--mixed refreshes the index' '
-	echo 123 >> file2 &&
-	git reset --mixed HEAD > output &&
-	test_i18ncmp expect output
+	# Verify default behavior (without --[no-]refresh or reset.refresh)
+	test_reset_refreshes_index &&
+
+	# With --quiet
+	test_reset_refreshes_index "" --quiet
+'
+
+test_expect_success '--mixed --[no-]refresh sets refresh behavior' '
+	# Verify that --[no-]refresh controls index refresh
+	test_reset_refreshes_index "" --refresh &&
+	! test_reset_refreshes_index "" --no-refresh
+'
+
+test_expect_success '--mixed preserves skip-worktree' '
+	echo 123 >>file2 &&
+	git add file2 &&
+	git update-index --skip-worktree file2 &&
+	git reset --mixed HEAD >output &&
+	test_must_be_empty output &&
+
+	cat >expect <<-\EOF &&
+	Unstaged changes after reset:
+	M	file2
+	EOF
+	git update-index --no-skip-worktree file2 &&
+	git add file2 &&
+	git reset --mixed HEAD >output &&
+	test_cmp expect output
 '
 
 test_expect_success 'resetting specific path that is unmerged' '
@@ -498,7 +542,6 @@ test_expect_success 'resetting specific path that is unmerged' '
 '
 
 test_expect_success 'disambiguation (1)' '
-
 	git reset --hard &&
 	>secondfile &&
 	git add secondfile &&
@@ -507,11 +550,9 @@ test_expect_success 'disambiguation (1)' '
 	test -z "$(git diff --cached --name-only)" &&
 	test -f secondfile &&
 	test_must_be_empty secondfile
-
 '
 
 test_expect_success 'disambiguation (2)' '
-
 	git reset --hard &&
 	>secondfile &&
 	git add secondfile &&
@@ -519,11 +560,9 @@ test_expect_success 'disambiguation (2)' '
 	test_must_fail git reset secondfile &&
 	test -n "$(git diff --cached --name-only -- secondfile)" &&
 	test ! -f secondfile
-
 '
 
 test_expect_success 'disambiguation (3)' '
-
 	git reset --hard &&
 	>secondfile &&
 	git add secondfile &&
@@ -532,11 +571,9 @@ test_expect_success 'disambiguation (3)' '
 	test_must_fail git diff --quiet &&
 	test -z "$(git diff --cached --name-only)" &&
 	test ! -f secondfile
-
 '
 
 test_expect_success 'disambiguation (4)' '
-
 	git reset --hard &&
 	>secondfile &&
 	git add secondfile &&
@@ -579,4 +616,12 @@ test_expect_success 'reset --mixed sets up work tree' '
 	test_must_be_empty actual
 '
 
+test_expect_success 'reset handles --end-of-options' '
+	git update-ref refs/heads/--foo HEAD^ &&
+	git log -1 --format=%s refs/heads/--foo >expect &&
+	git reset --hard --end-of-options --foo &&
+	git log -1 --format=%s HEAD >actual &&
+	test_cmp expect actual
+'
+
 test_done
diff --git a/t/t7103-reset-bare.sh b/t/t7103-reset-bare.sh
index afe36a5..18bbd99 100755
--- a/t/t7103-reset-bare.sh
+++ b/t/t7103-reset-bare.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='git reset in a bare repository'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup non-bare' '
@@ -63,7 +65,10 @@ test_expect_success '"mixed" reset is not allowed in bare' '
 
 test_expect_success '"soft" reset is allowed in bare' '
 	git reset --soft HEAD^ &&
-	test "$(git show --pretty=format:%s | head -n 1)" = "one"
+	git show --pretty=format:%s >out &&
+	echo one >expect &&
+	head -n 1 out >actual &&
+	test_cmp expect actual
 '
 
 test_done
diff --git a/t/t7104-reset-hard.sh b/t/t7104-reset-hard.sh
index 16faa07..cf9697e 100755
--- a/t/t7104-reset-hard.sh
+++ b/t/t7104-reset-hard.sh
@@ -2,6 +2,7 @@
 
 test_description='reset --hard unmerged'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -33,7 +34,7 @@ test_expect_success 'reset --hard should restore unmerged ones' '
 
 '
 
-test_expect_success 'reset --hard did not corrupt index or cached-tree' '
+test_expect_success 'reset --hard did not corrupt index or cache-tree' '
 
 	T=$(git write-tree) &&
 	rm -f .git/index &&
diff --git a/t/t7105-reset-patch.sh b/t/t7105-reset-patch.sh
index fc2a6cf..f4f3b7a 100755
--- a/t/t7105-reset-patch.sh
+++ b/t/t7105-reset-patch.sh
@@ -1,9 +1,11 @@
 #!/bin/sh
 
 test_description='git reset --patch'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./lib-patch-mode.sh
 
-test_expect_success PERL 'setup' '
+test_expect_success 'setup' '
 	mkdir dir &&
 	echo parent > dir/foo &&
 	echo dummy > bar &&
@@ -17,42 +19,46 @@ test_expect_success PERL 'setup' '
 
 # note: bar sorts before foo, so the first 'n' is always to skip 'bar'
 
-test_expect_success PERL 'saying "n" does nothing' '
+test_expect_success 'saying "n" does nothing' '
 	set_and_save_state dir/foo work work &&
 	test_write_lines n n | git reset -p &&
 	verify_saved_state dir/foo &&
 	verify_saved_state bar
 '
 
-test_expect_success PERL 'git reset -p' '
-	test_write_lines n y | git reset -p >output &&
-	verify_state dir/foo work head &&
-	verify_saved_state bar &&
-	test_i18ngrep "Unstage" output
-'
-
-test_expect_success PERL 'git reset -p HEAD^' '
+for opt in "HEAD" "@" ""
+do
+	test_expect_success "git reset -p $opt" '
+		set_and_save_state dir/foo work work &&
+		test_write_lines n y | git reset -p $opt >output &&
+		verify_state dir/foo work head &&
+		verify_saved_state bar &&
+		test_grep "Unstage" output
+	'
+done
+
+test_expect_success 'git reset -p HEAD^' '
 	test_write_lines n y | git reset -p HEAD^ >output &&
 	verify_state dir/foo work parent &&
 	verify_saved_state bar &&
-	test_i18ngrep "Apply" output
+	test_grep "Apply" output
 '
 
-test_expect_success PERL 'git reset -p HEAD^^{tree}' '
+test_expect_success 'git reset -p HEAD^^{tree}' '
 	test_write_lines n y | git reset -p HEAD^^{tree} >output &&
 	verify_state dir/foo work parent &&
 	verify_saved_state bar &&
-	test_i18ngrep "Apply" output
+	test_grep "Apply" output
 '
 
-test_expect_success PERL 'git reset -p HEAD^:dir/foo (blob fails)' '
+test_expect_success 'git reset -p HEAD^:dir/foo (blob fails)' '
 	set_and_save_state dir/foo work work &&
 	test_must_fail git reset -p HEAD^:dir/foo &&
 	verify_saved_state dir/foo &&
 	verify_saved_state bar
 '
 
-test_expect_success PERL 'git reset -p aaaaaaaa (unknown fails)' '
+test_expect_success 'git reset -p aaaaaaaa (unknown fails)' '
 	set_and_save_state dir/foo work work &&
 	test_must_fail git reset -p aaaaaaaa &&
 	verify_saved_state dir/foo &&
@@ -64,27 +70,27 @@ test_expect_success PERL 'git reset -p aaaaaaaa (unknown fails)' '
 # dir/foo.  There's always an extra 'n' to reject edits to dir/foo in
 # the failure case (and thus get out of the loop).
 
-test_expect_success PERL 'git reset -p dir' '
+test_expect_success 'git reset -p dir' '
 	set_state dir/foo work work &&
 	test_write_lines y n | git reset -p dir &&
 	verify_state dir/foo work head &&
 	verify_saved_state bar
 '
 
-test_expect_success PERL 'git reset -p -- foo (inside dir)' '
+test_expect_success 'git reset -p -- foo (inside dir)' '
 	set_state dir/foo work work &&
 	test_write_lines y n | (cd dir && git reset -p -- foo) &&
 	verify_state dir/foo work head &&
 	verify_saved_state bar
 '
 
-test_expect_success PERL 'git reset -p HEAD^ -- dir' '
+test_expect_success 'git reset -p HEAD^ -- dir' '
 	test_write_lines y n | git reset -p HEAD^ -- dir &&
 	verify_state dir/foo work parent &&
 	verify_saved_state bar
 '
 
-test_expect_success PERL 'none of this moved HEAD' '
+test_expect_success 'none of this moved HEAD' '
 	verify_saved_head
 '
 
diff --git a/t/t7106-reset-unborn-branch.sh b/t/t7106-reset-unborn-branch.sh
index ecb85c3..88d1c8a 100755
--- a/t/t7106-reset-unborn-branch.sh
+++ b/t/t7106-reset-unborn-branch.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='git reset should work on unborn branch'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -32,7 +34,7 @@ test_expect_success 'reset $file' '
 	test_cmp expect actual
 '
 
-test_expect_success PERL 'reset -p' '
+test_expect_success 'reset -p' '
 	rm .git/index &&
 	git add a &&
 	echo y >yes &&
@@ -40,7 +42,7 @@ test_expect_success PERL 'reset -p' '
 
 	git ls-files >actual &&
 	test_must_be_empty actual &&
-	test_i18ngrep "Unstage" output
+	test_grep "Unstage" output
 '
 
 test_expect_success 'reset --soft is a no-op' '
diff --git a/t/t7107-reset-pathspec-file.sh b/t/t7107-reset-pathspec-file.sh
index 15ccb14..020db20 100755
--- a/t/t7107-reset-pathspec-file.sh
+++ b/t/t7107-reset-pathspec-file.sh
@@ -2,6 +2,7 @@
 
 test_description='reset --pathspec-from-file'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_tick
@@ -160,19 +161,19 @@ test_expect_success 'error conditions' '
 	git rm fileA.t &&
 
 	test_must_fail git reset --pathspec-from-file=list --patch 2>err &&
-	test_i18ngrep -e "--pathspec-from-file is incompatible with --patch" err &&
+	test_grep -e "options .--pathspec-from-file. and .--patch. cannot be used together" err &&
 
 	test_must_fail git reset --pathspec-from-file=list -- fileA.t 2>err &&
-	test_i18ngrep -e "--pathspec-from-file is incompatible with pathspec arguments" err &&
+	test_grep -e ".--pathspec-from-file. and pathspec arguments cannot be used together" err &&
 
 	test_must_fail git reset --pathspec-file-nul 2>err &&
-	test_i18ngrep -e "--pathspec-file-nul requires --pathspec-from-file" err &&
+	test_grep -e "the option .--pathspec-file-nul. requires .--pathspec-from-file." err &&
 
 	test_must_fail git reset --soft --pathspec-from-file=list 2>err &&
-	test_i18ngrep -e "fatal: Cannot do soft reset with paths" err &&
+	test_grep -e "fatal: Cannot do soft reset with paths" err &&
 
 	test_must_fail git reset --hard --pathspec-from-file=list 2>err &&
-	test_i18ngrep -e "fatal: Cannot do hard reset with paths" err
+	test_grep -e "fatal: Cannot do hard reset with paths" err
 '
 
 test_done
diff --git a/t/t7110-reset-merge.sh b/t/t7110-reset-merge.sh
index a82a07a..7ee180f 100755
--- a/t/t7110-reset-merge.sh
+++ b/t/t7110-reset-merge.sh
@@ -5,20 +5,21 @@
 
 test_description='Tests for "git reset" with "--merge" and "--keep" options'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
-    for i in 1 2 3; do echo line $i; done >file1 &&
-    cat file1 >file2 &&
-    git add file1 file2 &&
-    test_tick &&
-    git commit -m "Initial commit" &&
-    git tag initial &&
-    echo line 4 >>file1 &&
-    cat file1 >file2 &&
-    test_tick &&
-    git commit -m "add line 4 to file1" file1 &&
-    git tag second
+	printf "line %d\n" 1 2 3 >file1 &&
+	cat file1 >file2 &&
+	git add file1 file2 &&
+	test_tick &&
+	git commit -m "Initial commit" &&
+	git tag initial &&
+	echo line 4 >>file1 &&
+	cat file1 >file2 &&
+	test_tick &&
+	git commit -m "add line 4 to file1" file1 &&
+	git tag second
 '
 
 # The next test will test the following:
@@ -28,19 +29,19 @@ test_expect_success setup '
 # file1:     C       C     C    D     --merge  D       D     D
 # file2:     C       D     D    D     --merge  C       D     D
 test_expect_success 'reset --merge is ok with changes in file it does not touch' '
-    git reset --merge HEAD^ &&
-    ! grep 4 file1 &&
-    grep 4 file2 &&
-    test "$(git rev-parse HEAD)" = "$(git rev-parse initial)" &&
-    test -z "$(git diff --cached)"
+	git reset --merge HEAD^ &&
+	! grep 4 file1 &&
+	grep 4 file2 &&
+	test "$(git rev-parse HEAD)" = "$(git rev-parse initial)" &&
+	test -z "$(git diff --cached)"
 '
 
 test_expect_success 'reset --merge is ok when switching back' '
-    git reset --merge second &&
-    grep 4 file1 &&
-    grep 4 file2 &&
-    test "$(git rev-parse HEAD)" = "$(git rev-parse second)" &&
-    test -z "$(git diff --cached)"
+	git reset --merge second &&
+	grep 4 file1 &&
+	grep 4 file2 &&
+	test "$(git rev-parse HEAD)" = "$(git rev-parse second)" &&
+	test -z "$(git diff --cached)"
 '
 
 # The next test will test the following:
@@ -50,21 +51,21 @@ test_expect_success 'reset --merge is ok when switching back' '
 # file1:     C       C     C    D     --keep   D       D     D
 # file2:     C       D     D    D     --keep   C       D     D
 test_expect_success 'reset --keep is ok with changes in file it does not touch' '
-    git reset --hard second &&
-    cat file1 >file2 &&
-    git reset --keep HEAD^ &&
-    ! grep 4 file1 &&
-    grep 4 file2 &&
-    test "$(git rev-parse HEAD)" = "$(git rev-parse initial)" &&
-    test -z "$(git diff --cached)"
+	git reset --hard second &&
+	cat file1 >file2 &&
+	git reset --keep HEAD^ &&
+	! grep 4 file1 &&
+	grep 4 file2 &&
+	test "$(git rev-parse HEAD)" = "$(git rev-parse initial)" &&
+	test -z "$(git diff --cached)"
 '
 
 test_expect_success 'reset --keep is ok when switching back' '
-    git reset --keep second &&
-    grep 4 file1 &&
-    grep 4 file2 &&
-    test "$(git rev-parse HEAD)" = "$(git rev-parse second)" &&
-    test -z "$(git diff --cached)"
+	git reset --keep second &&
+	grep 4 file1 &&
+	grep 4 file2 &&
+	test "$(git rev-parse HEAD)" = "$(git rev-parse second)" &&
+	test -z "$(git diff --cached)"
 '
 
 # The next test will test the following:
@@ -74,28 +75,28 @@ test_expect_success 'reset --keep is ok when switching back' '
 # file1:     B       B     C    D     --merge  D       D     D
 # file2:     C       D     D    D     --merge  C       D     D
 test_expect_success 'reset --merge discards changes added to index (1)' '
-    git reset --hard second &&
-    cat file1 >file2 &&
-    echo "line 5" >> file1 &&
-    git add file1 &&
-    git reset --merge HEAD^ &&
-    ! grep 4 file1 &&
-    ! grep 5 file1 &&
-    grep 4 file2 &&
-    test "$(git rev-parse HEAD)" = "$(git rev-parse initial)" &&
-    test -z "$(git diff --cached)"
+	git reset --hard second &&
+	cat file1 >file2 &&
+	echo "line 5" >> file1 &&
+	git add file1 &&
+	git reset --merge HEAD^ &&
+	! grep 4 file1 &&
+	! grep 5 file1 &&
+	grep 4 file2 &&
+	test "$(git rev-parse HEAD)" = "$(git rev-parse initial)" &&
+	test -z "$(git diff --cached)"
 '
 
 test_expect_success 'reset --merge is ok again when switching back (1)' '
-    git reset --hard initial &&
-    echo "line 5" >> file2 &&
-    git add file2 &&
-    git reset --merge second &&
-    ! grep 4 file2 &&
-    ! grep 5 file1 &&
-    grep 4 file1 &&
-    test "$(git rev-parse HEAD)" = "$(git rev-parse second)" &&
-    test -z "$(git diff --cached)"
+	git reset --hard initial &&
+	echo "line 5" >> file2 &&
+	git add file2 &&
+	git reset --merge second &&
+	! grep 4 file2 &&
+	! grep 5 file1 &&
+	grep 4 file1 &&
+	test "$(git rev-parse HEAD)" = "$(git rev-parse second)" &&
+	test -z "$(git diff --cached)"
 '
 
 # The next test will test the following:
@@ -104,10 +105,10 @@ test_expect_success 'reset --merge is ok again when switching back (1)' '
 #           ----------------------------------------------------
 # file1:     B       B     C    D     --keep   (disallowed)
 test_expect_success 'reset --keep fails with changes in index in files it touches' '
-    git reset --hard second &&
-    echo "line 5" >> file1 &&
-    git add file1 &&
-    test_must_fail git reset --keep HEAD^
+	git reset --hard second &&
+	echo "line 5" >> file1 &&
+	git add file1 &&
+	test_must_fail git reset --keep HEAD^
 '
 
 # The next test will test the following:
@@ -117,23 +118,23 @@ test_expect_success 'reset --keep fails with changes in index in files it touche
 # file1:     C       C     C    D     --merge  D       D     D
 # file2:     C       C     D    D     --merge  D       D     D
 test_expect_success 'reset --merge discards changes added to index (2)' '
-    git reset --hard second &&
-    echo "line 4" >> file2 &&
-    git add file2 &&
-    git reset --merge HEAD^ &&
-    ! grep 4 file2 &&
-    test "$(git rev-parse HEAD)" = "$(git rev-parse initial)" &&
-    test -z "$(git diff)" &&
-    test -z "$(git diff --cached)"
+	git reset --hard second &&
+	echo "line 4" >> file2 &&
+	git add file2 &&
+	git reset --merge HEAD^ &&
+	! grep 4 file2 &&
+	test "$(git rev-parse HEAD)" = "$(git rev-parse initial)" &&
+	test -z "$(git diff)" &&
+	test -z "$(git diff --cached)"
 '
 
 test_expect_success 'reset --merge is ok again when switching back (2)' '
-    git reset --hard initial &&
-    git reset --merge second &&
-    ! grep 4 file2 &&
-    grep 4 file1 &&
-    test "$(git rev-parse HEAD)" = "$(git rev-parse second)" &&
-    test -z "$(git diff --cached)"
+	git reset --hard initial &&
+	git reset --merge second &&
+	! grep 4 file2 &&
+	grep 4 file1 &&
+	test "$(git rev-parse HEAD)" = "$(git rev-parse second)" &&
+	test -z "$(git diff --cached)"
 '
 
 # The next test will test the following:
@@ -143,21 +144,21 @@ test_expect_success 'reset --merge is ok again when switching back (2)' '
 # file1:     C       C     C    D     --keep   D       D     D
 # file2:     C       C     D    D     --keep   C       D     D
 test_expect_success 'reset --keep keeps changes it does not touch' '
-    git reset --hard second &&
-    echo "line 4" >> file2 &&
-    git add file2 &&
-    git reset --keep HEAD^ &&
-    grep 4 file2 &&
-    test "$(git rev-parse HEAD)" = "$(git rev-parse initial)" &&
-    test -z "$(git diff --cached)"
+	git reset --hard second &&
+	echo "line 4" >> file2 &&
+	git add file2 &&
+	git reset --keep HEAD^ &&
+	grep 4 file2 &&
+	test "$(git rev-parse HEAD)" = "$(git rev-parse initial)" &&
+	test -z "$(git diff --cached)"
 '
 
 test_expect_success 'reset --keep keeps changes when switching back' '
-    git reset --keep second &&
-    grep 4 file2 &&
-    grep 4 file1 &&
-    test "$(git rev-parse HEAD)" = "$(git rev-parse second)" &&
-    test -z "$(git diff --cached)"
+	git reset --keep second &&
+	grep 4 file2 &&
+	grep 4 file1 &&
+	test "$(git rev-parse HEAD)" = "$(git rev-parse second)" &&
+	test -z "$(git diff --cached)"
 '
 
 # The next test will test the following:
@@ -166,14 +167,14 @@ test_expect_success 'reset --keep keeps changes when switching back' '
 #           ----------------------------------------------------
 # file1:     A       B     B    C     --merge  (disallowed)
 test_expect_success 'reset --merge fails with changes in file it touches' '
-    git reset --hard second &&
-    echo "line 5" >> file1 &&
-    test_tick &&
-    git commit -m "add line 5" file1 &&
-    sed -e "s/line 1/changed line 1/" <file1 >file3 &&
-    mv file3 file1 &&
-    test_must_fail git reset --merge HEAD^ 2>err.log &&
-    grep file1 err.log | grep "not uptodate"
+	git reset --hard second &&
+	echo "line 5" >> file1 &&
+	test_tick &&
+	git commit -m "add line 5" file1 &&
+	sed -e "s/line 1/changed line 1/" <file1 >file3 &&
+	mv file3 file1 &&
+	test_must_fail git reset --merge HEAD^ 2>err.log &&
+	grep file1 err.log | grep "not uptodate"
 '
 
 # The next test will test the following:
@@ -182,36 +183,36 @@ test_expect_success 'reset --merge fails with changes in file it touches' '
 #           ----------------------------------------------------
 # file1:     A       B     B    C     --keep   (disallowed)
 test_expect_success 'reset --keep fails with changes in file it touches' '
-    git reset --hard second &&
-    echo "line 5" >> file1 &&
-    test_tick &&
-    git commit -m "add line 5" file1 &&
-    sed -e "s/line 1/changed line 1/" <file1 >file3 &&
-    mv file3 file1 &&
-    test_must_fail git reset --keep HEAD^ 2>err.log &&
-    grep file1 err.log | grep "not uptodate"
+	git reset --hard second &&
+	echo "line 5" >> file1 &&
+	test_tick &&
+	git commit -m "add line 5" file1 &&
+	sed -e "s/line 1/changed line 1/" <file1 >file3 &&
+	mv file3 file1 &&
+	test_must_fail git reset --keep HEAD^ 2>err.log &&
+	grep file1 err.log | grep "not uptodate"
 '
 
 test_expect_success 'setup 3 different branches' '
-    git reset --hard second &&
-    git branch branch1 &&
-    git branch branch2 &&
-    git branch branch3 &&
-    git checkout branch1 &&
-    echo "line 5 in branch1" >> file1 &&
-    test_tick &&
-    git commit -a -m "change in branch1" &&
-    git checkout branch2 &&
-    echo "line 5 in branch2" >> file1 &&
-    test_tick &&
-    git commit -a -m "change in branch2" &&
-    git tag third &&
-    git checkout branch3 &&
-    echo a new file >file3 &&
-    rm -f file1 &&
-    git add file3 &&
-    test_tick &&
-    git commit -a -m "change in branch3"
+	git reset --hard second &&
+	git branch branch1 &&
+	git branch branch2 &&
+	git branch branch3 &&
+	git checkout branch1 &&
+	echo "line 5 in branch1" >> file1 &&
+	test_tick &&
+	git commit -a -m "change in branch1" &&
+	git checkout branch2 &&
+	echo "line 5 in branch2" >> file1 &&
+	test_tick &&
+	git commit -a -m "change in branch2" &&
+	git tag third &&
+	git checkout branch3 &&
+	echo a new file >file3 &&
+	rm -f file1 &&
+	git add file3 &&
+	test_tick &&
+	git commit -a -m "change in branch3"
 '
 
 # The next test will test the following:
@@ -220,12 +221,12 @@ test_expect_success 'setup 3 different branches' '
 #           ----------------------------------------------------
 # file1:     X       U     B    C     --merge  C       C     C
 test_expect_success '"reset --merge HEAD^" is ok with pending merge' '
-    git checkout third &&
-    test_must_fail git merge branch1 &&
-    git reset --merge HEAD^ &&
-    test "$(git rev-parse HEAD)" = "$(git rev-parse second)" &&
-    test -z "$(git diff --cached)" &&
-    test -z "$(git diff)"
+	git checkout third &&
+	test_must_fail git merge branch1 &&
+	git reset --merge HEAD^ &&
+	test "$(git rev-parse HEAD)" = "$(git rev-parse second)" &&
+	test -z "$(git diff --cached)" &&
+	test -z "$(git diff)"
 '
 
 # The next test will test the following:
@@ -234,10 +235,10 @@ test_expect_success '"reset --merge HEAD^" is ok with pending merge' '
 #           ----------------------------------------------------
 # file1:     X       U     B    C     --keep   (disallowed)
 test_expect_success '"reset --keep HEAD^" fails with pending merge' '
-    git reset --hard third &&
-    test_must_fail git merge branch1 &&
-    test_must_fail git reset --keep HEAD^ 2>err.log &&
-    test_i18ngrep "middle of a merge" err.log
+	git reset --hard third &&
+	test_must_fail git merge branch1 &&
+	test_must_fail git reset --keep HEAD^ 2>err.log &&
+	test_grep "middle of a merge" err.log
 '
 
 # The next test will test the following:
@@ -246,12 +247,12 @@ test_expect_success '"reset --keep HEAD^" fails with pending merge' '
 #           ----------------------------------------------------
 # file1:     X       U     B    B     --merge  B       B     B
 test_expect_success '"reset --merge HEAD" is ok with pending merge' '
-    git reset --hard third &&
-    test_must_fail git merge branch1 &&
-    git reset --merge HEAD &&
-    test "$(git rev-parse HEAD)" = "$(git rev-parse third)" &&
-    test -z "$(git diff --cached)" &&
-    test -z "$(git diff)"
+	git reset --hard third &&
+	test_must_fail git merge branch1 &&
+	git reset --merge HEAD &&
+	test "$(git rev-parse HEAD)" = "$(git rev-parse third)" &&
+	test -z "$(git diff --cached)" &&
+	test -z "$(git diff)"
 '
 
 # The next test will test the following:
@@ -260,36 +261,36 @@ test_expect_success '"reset --merge HEAD" is ok with pending merge' '
 #           ----------------------------------------------------
 # file1:     X       U     B    B     --keep   (disallowed)
 test_expect_success '"reset --keep HEAD" fails with pending merge' '
-    git reset --hard third &&
-    test_must_fail git merge branch1 &&
-    test_must_fail git reset --keep HEAD 2>err.log &&
-    test_i18ngrep "middle of a merge" err.log
+	git reset --hard third &&
+	test_must_fail git merge branch1 &&
+	test_must_fail git reset --keep HEAD 2>err.log &&
+	test_grep "middle of a merge" err.log
 '
 
 test_expect_success '--merge is ok with added/deleted merge' '
-    git reset --hard third &&
-    rm -f file2 &&
-    test_must_fail git merge branch3 &&
-    ! test -f file2 &&
-    test -f file3 &&
-    git diff --exit-code file3 &&
-    git diff --exit-code branch3 file3 &&
-    git reset --merge HEAD &&
-    ! test -f file3 &&
-    ! test -f file2 &&
-    git diff --exit-code --cached
+	git reset --hard third &&
+	rm -f file2 &&
+	test_must_fail git merge branch3 &&
+	! test -f file2 &&
+	test -f file3 &&
+	git diff --exit-code file3 &&
+	git diff --exit-code branch3 file3 &&
+	git reset --merge HEAD &&
+	! test -f file3 &&
+	! test -f file2 &&
+	git diff --exit-code --cached
 '
 
 test_expect_success '--keep fails with added/deleted merge' '
-    git reset --hard third &&
-    rm -f file2 &&
-    test_must_fail git merge branch3 &&
-    ! test -f file2 &&
-    test -f file3 &&
-    git diff --exit-code file3 &&
-    git diff --exit-code branch3 file3 &&
-    test_must_fail git reset --keep HEAD 2>err.log &&
-    test_i18ngrep "middle of a merge" err.log
+	git reset --hard third &&
+	rm -f file2 &&
+	test_must_fail git merge branch3 &&
+	! test -f file2 &&
+	test -f file3 &&
+	git diff --exit-code file3 &&
+	git diff --exit-code branch3 file3 &&
+	test_must_fail git reset --keep HEAD 2>err.log &&
+	test_grep "middle of a merge" err.log
 '
 
 test_done
diff --git a/t/t7111-reset-table.sh b/t/t7111-reset-table.sh
index ce421ad..01b7c35 100755
--- a/t/t7111-reset-table.sh
+++ b/t/t7111-reset-table.sh
@@ -5,13 +5,14 @@
 
 test_description='Tests to check that "reset" options follow a known table'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 
 test_expect_success 'creating initial commits' '
-    test_commit E file1 &&
-    test_commit D file1 &&
-    test_commit C file1
+	test_commit E file1 &&
+	test_commit D file1 &&
+	test_commit C file1
 '
 
 while read W1 I1 H1 T opt W2 I2 H2
@@ -73,13 +74,13 @@ B C C C keep   B C C
 EOF
 
 test_expect_success 'setting up branches to test with unmerged entries' '
-    git reset --hard C &&
-    git branch branch1 &&
-    git branch branch2 &&
-    git checkout branch1 &&
-    test_commit B1 file1 &&
-    git checkout branch2 &&
-    test_commit B file1
+	git reset --hard C &&
+	git branch branch1 &&
+	git branch branch2 &&
+	git checkout branch1 &&
+	test_commit B1 file1 &&
+	git checkout branch2 &&
+	test_commit B file1
 '
 
 while read W1 I1 H1 T opt W2 I2 H2
diff --git a/t/t7112-reset-submodule.sh b/t/t7112-reset-submodule.sh
index 19830d9..a3e2413 100755
--- a/t/t7112-reset-submodule.sh
+++ b/t/t7112-reset-submodule.sh
@@ -6,7 +6,6 @@ test_description='reset can handle submodules'
 . "$TEST_DIRECTORY"/lib-submodule-update.sh
 
 KNOWN_FAILURE_DIRECTORY_SUBMODULE_CONFLICTS=1
-KNOWN_FAILURE_SUBMODULE_OVERWRITE_IGNORED_UNTRACKED=1
 
 test_submodule_switch_recursing_with_args "reset --keep"
 
diff --git a/t/t7113-post-index-change-hook.sh b/t/t7113-post-index-change-hook.sh
index f011ad7..58e55a7 100755
--- a/t/t7113-post-index-change-hook.sh
+++ b/t/t7113-post-index-change-hook.sh
@@ -2,6 +2,10 @@
 
 test_description='post index change hook'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -13,8 +17,7 @@ test_expect_success 'setup' '
 '
 
 test_expect_success 'test status, add, commit, others trigger hook without flags set' '
-	mkdir -p .git/hooks &&
-	write_script .git/hooks/post-index-change <<-\EOF &&
+	test_hook post-index-change <<-\EOF &&
 		if test "$1" -eq 1; then
 			echo "Invalid combination of flags passed to hook; updated_workdir is set." >testfailure
 			exit 1
@@ -59,7 +62,7 @@ test_expect_success 'test status, add, commit, others trigger hook without flags
 '
 
 test_expect_success 'test checkout and reset trigger the hook' '
-	write_script .git/hooks/post-index-change <<-\EOF &&
+	test_hook post-index-change <<-\EOF &&
 		if test "$1" -eq 1 && test "$2" -eq 1; then
 			echo "Invalid combination of flags passed to hook; updated_workdir and updated_skipworktree are both set." >testfailure
 			exit 1
@@ -85,7 +88,7 @@ test_expect_success 'test checkout and reset trigger the hook' '
 	EOF
 	: force index to be dirty &&
 	test-tool chmtime +60 dir1/file1.txt &&
-	git checkout master &&
+	git checkout main &&
 	test_path_is_file testsuccess && rm -f testsuccess &&
 	test_path_is_missing testfailure &&
 	test-tool chmtime +60 dir1/file1.txt &&
@@ -102,7 +105,7 @@ test_expect_success 'test checkout and reset trigger the hook' '
 '
 
 test_expect_success 'test reset --mixed and update-index triggers the hook' '
-	write_script .git/hooks/post-index-change <<-\EOF &&
+	test_hook post-index-change <<-\EOF &&
 		if test "$1" -eq 1 && test "$2" -eq 1; then
 			echo "Invalid combination of flags passed to hook; updated_workdir and updated_skipworktree are both set." >testfailure
 			exit 1
diff --git a/t/t7201-co.sh b/t/t7201-co.sh
index 4d62b9b..42352dc 100755
--- a/t/t7201-co.sh
+++ b/t/t7201-co.sh
@@ -5,10 +5,10 @@
 
 test_description='git checkout tests.
 
-Creates master, forks renamer and side branches from it.
+Creates main, forks renamer and side branches from it.
 Test switching across them.
 
-  ! [master] Initial A one, A two
+  ! [main] Initial A one, A two
    * [renamer] Renamer R one->uno, M two
     ! [side] Side M one, D two, A three
      ! [simple] Simple D one, M two
@@ -16,10 +16,13 @@ Test switching across them.
      + [simple] Simple D one, M two
     +  [side] Side M one, D two, A three
    *   [renamer] Renamer R one->uno, M two
-  +*++ [master] Initial A one, A two
+  +*++ [main] Initial A one, A two
 
 '
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 test_tick
@@ -33,8 +36,7 @@ fill () {
 
 
 test_expect_success setup '
-
-	fill x y z > same &&
+	fill x y z >same &&
 	fill 1 2 3 4 5 6 7 8 >one &&
 	fill a b c d e >two &&
 	git add same one two &&
@@ -47,32 +49,30 @@ test_expect_success setup '
 	fill a b c d e f >two &&
 	git commit -a -m "Renamer R one->uno, M two" &&
 
-	git checkout -b side master &&
+	git checkout -b side main &&
 	fill 1 2 3 4 5 6 7 >one &&
 	fill A B C D E >three &&
 	rm -f two &&
 	git update-index --add --remove one two three &&
 	git commit -m "Side M one, D two, A three" &&
 
-	git checkout -b simple master &&
+	git checkout -b simple main &&
 	rm -f one &&
-	fill a c e > two &&
+	fill a c e >two &&
 	git commit -a -m "Simple D one, M two" &&
 
-	git checkout master
+	git checkout main
 '
 
-test_expect_success "checkout from non-existing branch" '
-
-	git checkout -b delete-me master &&
+test_expect_success 'checkout from non-existing branch' '
+	git checkout -b delete-me main &&
 	git update-ref -d --no-deref refs/heads/delete-me &&
 	test refs/heads/delete-me = "$(git symbolic-ref HEAD)" &&
-	git checkout master &&
-	test refs/heads/master = "$(git symbolic-ref HEAD)"
+	git checkout main &&
+	test refs/heads/main = "$(git symbolic-ref HEAD)"
 '
 
-test_expect_success "checkout with dirty tree without -m" '
-
+test_expect_success 'checkout with dirty tree without -m' '
 	fill 0 1 2 3 4 5 6 7 8 >one &&
 	if git checkout side
 	then
@@ -81,12 +81,10 @@ test_expect_success "checkout with dirty tree without -m" '
 	else
 		echo "happy - failed correctly"
 	fi
-
 '
 
-test_expect_success "checkout with unrelated dirty tree without -m" '
-
-	git checkout -f master &&
+test_expect_success 'checkout with unrelated dirty tree without -m' '
+	git checkout -f main &&
 	fill 0 1 2 3 4 5 6 7 8 >same &&
 	cp same kept &&
 	git checkout side >messages &&
@@ -95,22 +93,21 @@ test_expect_success "checkout with unrelated dirty tree without -m" '
 	test_cmp messages.expect messages
 '
 
-test_expect_success "checkout -m with dirty tree" '
-
-	git checkout -f master &&
+test_expect_success 'checkout -m with dirty tree' '
+	git checkout -f main &&
 	git clean -f &&
 
 	fill 0 1 2 3 4 5 6 7 8 >one &&
-	git checkout -m side > messages &&
+	git checkout -m side >messages &&
 
 	test "$(git symbolic-ref HEAD)" = "refs/heads/side" &&
 
 	printf "M\t%s\n" one >expect.messages &&
 	test_cmp expect.messages messages &&
 
-	fill "M	one" "A	three" "D	two" >expect.master &&
-	git diff --name-status master >current.master &&
-	test_cmp expect.master current.master &&
+	fill "M	one" "A	three" "D	two" >expect.main &&
+	git diff --name-status main >current.main &&
+	test_cmp expect.main current.main &&
 
 	fill "M	one" >expect.side &&
 	git diff --name-status side >current.side &&
@@ -120,9 +117,8 @@ test_expect_success "checkout -m with dirty tree" '
 	test_must_be_empty current.index
 '
 
-test_expect_success "checkout -m with dirty tree, renamed" '
-
-	git checkout -f master && git clean -f &&
+test_expect_success 'checkout -m with dirty tree, renamed' '
+	git checkout -f main && git clean -f &&
 
 	fill 1 2 3 4 5 7 8 >one &&
 	if git checkout renamer
@@ -139,12 +135,10 @@ test_expect_success "checkout -m with dirty tree, renamed" '
 	! test -f one &&
 	git diff --cached >current &&
 	test_must_be_empty current
-
 '
 
 test_expect_success 'checkout -m with merge conflict' '
-
-	git checkout -f master && git clean -f &&
+	git checkout -f main && git clean -f &&
 
 	fill 1 T 3 4 5 6 S 8 >one &&
 	if git checkout renamer
@@ -157,7 +151,7 @@ test_expect_success 'checkout -m with merge conflict' '
 
 	git checkout -m renamer &&
 
-	git diff master:one :3:uno |
+	git diff main:one :3:uno |
 	sed -e "1,/^@@/d" -e "/^ /d" -e "s/^-/d/" -e "s/^+/a/" >current &&
 	fill d2 aT d7 aS >expect &&
 	test_cmp expect current &&
@@ -166,10 +160,10 @@ test_expect_success 'checkout -m with merge conflict' '
 '
 
 test_expect_success 'format of merge conflict from checkout -m' '
+	git checkout -f main &&
+	git clean -f &&
 
-	git checkout -f master && git clean -f &&
-
-	fill b d > two &&
+	fill b d >two &&
 	git checkout -m simple &&
 
 	git ls-files >current &&
@@ -190,10 +184,11 @@ test_expect_success 'format of merge conflict from checkout -m' '
 '
 
 test_expect_success 'checkout --merge --conflict=diff3 <branch>' '
+	git checkout -f main &&
+	git reset --hard &&
+	git clean -f &&
 
-	git checkout -f master && git reset --hard && git clean -f &&
-
-	fill b d > two &&
+	fill b d >two &&
 	git checkout --merge --conflict=diff3 simple &&
 
 	cat <<-EOF >expect &&
@@ -201,7 +196,7 @@ test_expect_success 'checkout --merge --conflict=diff3 <branch>' '
 	a
 	c
 	e
-	||||||| master
+	||||||| main
 	a
 	b
 	c
@@ -216,27 +211,28 @@ test_expect_success 'checkout --merge --conflict=diff3 <branch>' '
 '
 
 test_expect_success 'switch to another branch while carrying a deletion' '
-
-	git checkout -f master && git reset --hard && git clean -f &&
+	git checkout -f main &&
+	git reset --hard &&
+	git clean -f &&
 	git rm two &&
 
 	test_must_fail git checkout simple 2>errs &&
-	test_i18ngrep overwritten errs &&
+	test_grep overwritten errs &&
 
 	test_must_fail git read-tree --quiet -m -u HEAD simple 2>errs &&
 	test_must_be_empty errs
 '
 
 test_expect_success 'checkout to detach HEAD (with advice declined)' '
-
 	git config advice.detachedHead false &&
 	rev=$(git rev-parse --short renamer^) &&
-	git checkout -f renamer && git clean -f &&
+	git checkout -f renamer &&
+	git clean -f &&
 	git checkout renamer^ 2>messages &&
-	test_i18ngrep "HEAD is now at $rev" messages &&
+	test_grep "HEAD is now at $rev" messages &&
 	test_line_count = 1 messages &&
 	H=$(git rev-parse --verify HEAD) &&
-	M=$(git show-ref -s --verify refs/heads/master) &&
+	M=$(git show-ref -s --verify refs/heads/main) &&
 	test "z$H" = "z$M" &&
 	if git symbolic-ref HEAD >/dev/null 2>&1
 	then
@@ -250,12 +246,13 @@ test_expect_success 'checkout to detach HEAD (with advice declined)' '
 test_expect_success 'checkout to detach HEAD' '
 	git config advice.detachedHead true &&
 	rev=$(git rev-parse --short renamer^) &&
-	git checkout -f renamer && git clean -f &&
-	GIT_TEST_GETTEXT_POISON=false git checkout renamer^ 2>messages &&
+	git checkout -f renamer &&
+	git clean -f &&
+	git checkout renamer^ 2>messages &&
 	grep "HEAD is now at $rev" messages &&
 	test_line_count -gt 1 messages &&
 	H=$(git rev-parse --verify HEAD) &&
-	M=$(git show-ref -s --verify refs/heads/master) &&
+	M=$(git show-ref -s --verify refs/heads/main) &&
 	test "z$H" = "z$M" &&
 	if git symbolic-ref HEAD >/dev/null 2>&1
 	then
@@ -267,11 +264,11 @@ test_expect_success 'checkout to detach HEAD' '
 '
 
 test_expect_success 'checkout to detach HEAD with branchname^' '
-
-	git checkout -f master && git clean -f &&
+	git checkout -f main &&
+	git clean -f &&
 	git checkout renamer^ &&
 	H=$(git rev-parse --verify HEAD) &&
-	M=$(git show-ref -s --verify refs/heads/master) &&
+	M=$(git show-ref -s --verify refs/heads/main) &&
 	test "z$H" = "z$M" &&
 	if git symbolic-ref HEAD >/dev/null 2>&1
 	then
@@ -283,11 +280,11 @@ test_expect_success 'checkout to detach HEAD with branchname^' '
 '
 
 test_expect_success 'checkout to detach HEAD with :/message' '
-
-	git checkout -f master && git clean -f &&
+	git checkout -f main &&
+	git clean -f &&
 	git checkout ":/Initial" &&
 	H=$(git rev-parse --verify HEAD) &&
-	M=$(git show-ref -s --verify refs/heads/master) &&
+	M=$(git show-ref -s --verify refs/heads/main) &&
 	test "z$H" = "z$M" &&
 	if git symbolic-ref HEAD >/dev/null 2>&1
 	then
@@ -299,11 +296,11 @@ test_expect_success 'checkout to detach HEAD with :/message' '
 '
 
 test_expect_success 'checkout to detach HEAD with HEAD^0' '
-
-	git checkout -f master && git clean -f &&
+	git checkout -f main &&
+	git clean -f &&
 	git checkout HEAD^0 &&
 	H=$(git rev-parse --verify HEAD) &&
-	M=$(git show-ref -s --verify refs/heads/master) &&
+	M=$(git show-ref -s --verify refs/heads/main) &&
 	test "z$H" = "z$M" &&
 	if git symbolic-ref HEAD >/dev/null 2>&1
 	then
@@ -315,30 +312,27 @@ test_expect_success 'checkout to detach HEAD with HEAD^0' '
 '
 
 test_expect_success 'checkout with ambiguous tag/branch names' '
-
 	git tag both side &&
-	git branch both master &&
+	git branch both main &&
 	git reset --hard &&
-	git checkout master &&
+	git checkout main &&
 
 	git checkout both &&
 	H=$(git rev-parse --verify HEAD) &&
-	M=$(git show-ref -s --verify refs/heads/master) &&
+	M=$(git show-ref -s --verify refs/heads/main) &&
 	test "z$H" = "z$M" &&
 	name=$(git symbolic-ref HEAD 2>/dev/null) &&
 	test "z$name" = zrefs/heads/both
-
 '
 
 test_expect_success 'checkout with ambiguous tag/branch names' '
-
 	git reset --hard &&
-	git checkout master &&
+	git checkout main &&
 
 	git tag frotz side &&
-	git branch frotz master &&
+	git branch frotz main &&
 	git reset --hard &&
-	git checkout master &&
+	git checkout main &&
 
 	git checkout tags/frotz &&
 	H=$(git rev-parse --verify HEAD) &&
@@ -351,26 +345,19 @@ test_expect_success 'checkout with ambiguous tag/branch names' '
 	else
 		: happy
 	fi
-
 '
 
 test_expect_success 'switch branches while in subdirectory' '
-
 	git reset --hard &&
-	git checkout master &&
+	git checkout main &&
 
 	mkdir subs &&
-	(
-		cd subs &&
-		git checkout side
-	) &&
+	git -C subs checkout side &&
 	! test -f subs/one &&
 	rm -fr subs
-
 '
 
 test_expect_success 'checkout specific path while in subdirectory' '
-
 	git reset --hard &&
 	git checkout side &&
 	mkdir subs &&
@@ -378,88 +365,83 @@ test_expect_success 'checkout specific path while in subdirectory' '
 	git add subs/bero &&
 	git commit -m "add subs/bero" &&
 
-	git checkout master &&
+	git checkout main &&
 	mkdir -p subs &&
-	(
-		cd subs &&
-		git checkout side -- bero
-	) &&
+	git -C subs checkout side -- bero &&
 	test -f subs/bero
-
 '
 
-test_expect_success \
-    'checkout w/--track sets up tracking' '
-    git config branch.autosetupmerge false &&
-    git checkout master &&
-    git checkout --track -b track1 &&
-    test "$(git config branch.track1.remote)" &&
-    test "$(git config branch.track1.merge)"'
+test_expect_success 'checkout w/--track sets up tracking' '
+	git config branch.autosetupmerge false &&
+	git checkout main &&
+	git checkout --track -b track1 &&
+	test "$(git config branch.track1.remote)" &&
+	test "$(git config branch.track1.merge)"
+'
 
-test_expect_success \
-    'checkout w/autosetupmerge=always sets up tracking' '
-    test_when_finished git config branch.autosetupmerge false &&
-    git config branch.autosetupmerge always &&
-    git checkout master &&
-    git checkout -b track2 &&
-    test "$(git config branch.track2.remote)" &&
-    test "$(git config branch.track2.merge)"'
+test_expect_success 'checkout w/autosetupmerge=always sets up tracking' '
+	test_when_finished git config branch.autosetupmerge false &&
+	git config branch.autosetupmerge always &&
+	git checkout main &&
+	git checkout -b track2 &&
+	test "$(git config branch.track2.remote)" &&
+	test "$(git config branch.track2.merge)"
+'
 
 test_expect_success 'checkout w/--track from non-branch HEAD fails' '
-    git checkout master^0 &&
-    test_must_fail git symbolic-ref HEAD &&
-    test_must_fail git checkout --track -b track &&
-    test_must_fail git rev-parse --verify track &&
-    test_must_fail git symbolic-ref HEAD &&
-    test "z$(git rev-parse master^0)" = "z$(git rev-parse HEAD)"
+	git checkout main^0 &&
+	test_must_fail git symbolic-ref HEAD &&
+	test_must_fail git checkout --track -b track &&
+	test_must_fail git rev-parse --verify track &&
+	test_must_fail git symbolic-ref HEAD &&
+	test "z$(git rev-parse main^0)" = "z$(git rev-parse HEAD)"
 '
 
 test_expect_success 'checkout w/--track from tag fails' '
-    git checkout master^0 &&
-    test_must_fail git symbolic-ref HEAD &&
-    test_must_fail git checkout --track -b track frotz &&
-    test_must_fail git rev-parse --verify track &&
-    test_must_fail git symbolic-ref HEAD &&
-    test "z$(git rev-parse master^0)" = "z$(git rev-parse HEAD)"
+	git checkout main^0 &&
+	test_must_fail git symbolic-ref HEAD &&
+	test_must_fail git checkout --track -b track frotz &&
+	test_must_fail git rev-parse --verify track &&
+	test_must_fail git symbolic-ref HEAD &&
+	test "z$(git rev-parse main^0)" = "z$(git rev-parse HEAD)"
 '
 
 test_expect_success 'detach a symbolic link HEAD' '
-    git checkout master &&
-    git config --bool core.prefersymlinkrefs yes &&
-    git checkout side &&
-    git checkout master &&
-    it=$(git symbolic-ref HEAD) &&
-    test "z$it" = zrefs/heads/master &&
-    here=$(git rev-parse --verify refs/heads/master) &&
-    git checkout side^ &&
-    test "z$(git rev-parse --verify refs/heads/master)" = "z$here"
+	git checkout main &&
+	git config --bool core.prefersymlinkrefs yes &&
+	git checkout side &&
+	git checkout main &&
+	it=$(git symbolic-ref HEAD) &&
+	test "z$it" = zrefs/heads/main &&
+	here=$(git rev-parse --verify refs/heads/main) &&
+	git checkout side^ &&
+	test "z$(git rev-parse --verify refs/heads/main)" = "z$here"
 '
 
-test_expect_success \
-    'checkout with --track fakes a sensible -b <name>' '
-    git config remote.origin.fetch "+refs/heads/*:refs/remotes/origin/*" &&
-    git update-ref refs/remotes/origin/koala/bear renamer &&
+test_expect_success 'checkout with --track fakes a sensible -b <name>' '
+	git config remote.origin.fetch "+refs/heads/*:refs/remotes/origin/*" &&
+	git update-ref refs/remotes/origin/koala/bear renamer &&
 
-    git checkout --track origin/koala/bear &&
-    test "refs/heads/koala/bear" = "$(git symbolic-ref HEAD)" &&
-    test "$(git rev-parse HEAD)" = "$(git rev-parse renamer)" &&
+	git checkout --track origin/koala/bear &&
+	test "refs/heads/koala/bear" = "$(git symbolic-ref HEAD)" &&
+	test "$(git rev-parse HEAD)" = "$(git rev-parse renamer)" &&
 
-    git checkout master && git branch -D koala/bear &&
+	git checkout main && git branch -D koala/bear &&
 
-    git checkout --track refs/remotes/origin/koala/bear &&
-    test "refs/heads/koala/bear" = "$(git symbolic-ref HEAD)" &&
-    test "$(git rev-parse HEAD)" = "$(git rev-parse renamer)" &&
+	git checkout --track refs/remotes/origin/koala/bear &&
+	test "refs/heads/koala/bear" = "$(git symbolic-ref HEAD)" &&
+	test "$(git rev-parse HEAD)" = "$(git rev-parse renamer)" &&
 
-    git checkout master && git branch -D koala/bear &&
+	git checkout main && git branch -D koala/bear &&
 
-    git checkout --track remotes/origin/koala/bear &&
-    test "refs/heads/koala/bear" = "$(git symbolic-ref HEAD)" &&
-    test "$(git rev-parse HEAD)" = "$(git rev-parse renamer)"
+	git checkout --track remotes/origin/koala/bear &&
+	test "refs/heads/koala/bear" = "$(git symbolic-ref HEAD)" &&
+	test "$(git rev-parse HEAD)" = "$(git rev-parse renamer)"
 '
 
-test_expect_success \
-    'checkout with --track, but without -b, fails with too short tracked name' '
-    test_must_fail git checkout --track renamer'
+test_expect_success 'checkout with --track, but without -b, fails with too short tracked name' '
+	test_must_fail git checkout --track renamer
+'
 
 setup_conflicting_index () {
 	rm -f .git/index &&
@@ -515,6 +497,11 @@ test_expect_success 'checkout unmerged stage' '
 	test ztheirside = "z$(cat file)"
 '
 
+test_expect_success 'checkout path with --merge from tree-ish is a no-no' '
+	setup_conflicting_index &&
+	test_must_fail git checkout -m HEAD -- file
+'
+
 test_expect_success 'checkout with --merge' '
 	setup_conflicting_index &&
 	echo "none of the above" >sample &&
@@ -535,6 +522,48 @@ test_expect_success 'checkout with --merge' '
 	test_cmp merged file
 '
 
+test_expect_success 'checkout -m works after (mistaken) resolution' '
+	setup_conflicting_index &&
+	echo "none of the above" >sample &&
+	cat sample >fild &&
+	cat sample >file &&
+	cat sample >filf &&
+	# resolve to something
+	git add file &&
+	git checkout --merge -- fild file filf &&
+	{
+		echo "<<<<<<< ours" &&
+		echo ourside &&
+		echo "=======" &&
+		echo theirside &&
+		echo ">>>>>>> theirs"
+	} >merged &&
+	test_cmp expect fild &&
+	test_cmp expect filf &&
+	test_cmp merged file
+'
+
+test_expect_success 'checkout -m works after (mistaken) resolution to remove' '
+	setup_conflicting_index &&
+	echo "none of the above" >sample &&
+	cat sample >fild &&
+	cat sample >file &&
+	cat sample >filf &&
+	# resolve to remove
+	git rm file &&
+	git checkout --merge -- fild file filf &&
+	{
+		echo "<<<<<<< ours" &&
+		echo ourside &&
+		echo "=======" &&
+		echo theirside &&
+		echo ">>>>>>> theirs"
+	} >merged &&
+	test_cmp expect fild &&
+	test_cmp expect filf &&
+	test_cmp merged file
+'
+
 test_expect_success 'checkout with --merge, in diff3 -m style' '
 	git config merge.conflictstyle diff3 &&
 	setup_conflicting_index &&
@@ -602,19 +631,85 @@ test_expect_success 'checkout --conflict=diff3' '
 	test_cmp merged file
 '
 
+test_expect_success 'checkout --conflict=diff3 --no-conflict does not merge' '
+	setup_conflicting_index &&
+	echo "none of the above" >expect &&
+	cat expect >fild &&
+	cat expect >file &&
+	test_must_fail git checkout --conflict=diff3 --no-conflict -- fild file 2>err &&
+	test_cmp expect file &&
+	test_cmp expect fild &&
+	echo "error: path ${SQ}file${SQ} is unmerged" >expect &&
+	test_cmp expect err
+'
+
+test_expect_success 'checkout --conflict=diff3 --no-merge does not merge' '
+	setup_conflicting_index &&
+	echo "none of the above" >expect &&
+	cat expect >fild &&
+	cat expect >file &&
+	test_must_fail git checkout --conflict=diff3 --no-merge -- fild file 2>err &&
+	test_cmp expect file &&
+	test_cmp expect fild &&
+	echo "error: path ${SQ}file${SQ} is unmerged" >expect &&
+	test_cmp expect err
+'
+
+test_expect_success 'checkout --no-merge --conflict=diff3 does merge' '
+	setup_conflicting_index &&
+	echo "none of the above" >fild &&
+	echo "none of the above" >file &&
+	git checkout --no-merge --conflict=diff3 -- fild file &&
+	echo "ourside" >expect &&
+	test_cmp expect fild &&
+	cat >expect <<-\EOF &&
+	<<<<<<< ours
+	ourside
+	||||||| base
+	original
+	=======
+	theirside
+	>>>>>>> theirs
+	EOF
+	test_cmp expect file
+'
+
+test_expect_success 'checkout --merge --conflict=diff3 --no-conflict does merge' '
+	setup_conflicting_index &&
+	echo "none of the above" >fild &&
+	echo "none of the above" >file &&
+	git checkout --merge --conflict=diff3 --no-conflict -- fild file &&
+	echo "ourside" >expect &&
+	test_cmp expect fild &&
+	cat >expect <<-\EOF &&
+	<<<<<<< ours
+	ourside
+	=======
+	theirside
+	>>>>>>> theirs
+	EOF
+	test_cmp expect file
+'
+
+test_expect_success 'checkout with invalid conflict style' '
+	test_must_fail git checkout --conflict=bad 2>actual -- file &&
+	echo "error: unknown conflict style ${SQ}bad${SQ}" >expect &&
+	test_cmp expect actual
+'
+
 test_expect_success 'failing checkout -b should not break working tree' '
-	git reset --hard master &&
-	git symbolic-ref HEAD refs/heads/master &&
+	git clean -fd &&  # Remove untracked files in the way
+	git reset --hard main &&
+	git symbolic-ref HEAD refs/heads/main &&
 	test_must_fail git checkout -b renamer side^ &&
-	test $(git symbolic-ref HEAD) = refs/heads/master &&
+	test $(git symbolic-ref HEAD) = refs/heads/main &&
 	git diff --exit-code &&
 	git diff --cached --exit-code
-
 '
 
 test_expect_success 'switch out of non-branch' '
-	git reset --hard master &&
-	git checkout master^0 &&
+	git reset --hard main &&
+	git checkout main^0 &&
 	echo modified >one &&
 	test_must_fail git checkout renamer 2>error.log &&
 	! grep "^Previous HEAD" error.log
@@ -676,4 +771,21 @@ test_expect_success 'custom merge driver with checkout -m' '
 	test_cmp expect arm
 '
 
+test_expect_success 'tracking info copied with autoSetupMerge=inherit' '
+	git reset --hard main &&
+	# default config does not copy tracking info
+	git checkout -b foo-no-inherit koala/bear &&
+	test_cmp_config "" --default "" branch.foo-no-inherit.remote &&
+	test_cmp_config "" --default "" branch.foo-no-inherit.merge &&
+	# with autoSetupMerge=inherit, we copy tracking info from koala/bear
+	test_config branch.autoSetupMerge inherit &&
+	git checkout -b foo koala/bear &&
+	test_cmp_config origin branch.foo.remote &&
+	test_cmp_config refs/heads/koala/bear branch.foo.merge &&
+	# no tracking info to inherit from main
+	git checkout -b main2 main &&
+	test_cmp_config "" --default "" branch.main2.remote &&
+	test_cmp_config "" --default "" branch.main2.merge
+'
+
 test_done
diff --git a/t/t7300-clean.sh b/t/t7300-clean.sh
index cb5e34d..0aae0de 100755
--- a/t/t7300-clean.sh
+++ b/t/t7300-clean.sh
@@ -5,6 +5,7 @@
 
 test_description='git clean basic tests'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 git config clean.requireForce no
@@ -110,7 +111,7 @@ test_expect_success 'git clean with prefix' '
 
 '
 
-test_expect_success C_LOCALE_OUTPUT 'git clean with relative prefix' '
+test_expect_success 'git clean with relative prefix' '
 
 	mkdir -p build docs &&
 	touch a.out src/part3.c docs/manual.txt obj.o build/lib.so &&
@@ -120,10 +121,10 @@ test_expect_success C_LOCALE_OUTPUT 'git clean with relative prefix' '
 		grep part3 |
 		sed -n -e "s|^Would remove ||p"
 	) &&
-	verbose test "$would_clean" = ../src/part3.c
+	test "$would_clean" = ../src/part3.c
 '
 
-test_expect_success C_LOCALE_OUTPUT 'git clean with absolute path' '
+test_expect_success 'git clean with absolute path' '
 
 	mkdir -p build docs &&
 	touch a.out src/part3.c docs/manual.txt obj.o build/lib.so &&
@@ -133,7 +134,7 @@ test_expect_success C_LOCALE_OUTPUT 'git clean with absolute path' '
 		grep part3 |
 		sed -n -e "s|^Would remove ||p"
 	) &&
-	verbose test "$would_clean" = ../src/part3.c
+	test "$would_clean" = ../src/part3.c
 '
 
 test_expect_success 'git clean with out of work tree relative path' '
@@ -407,7 +408,13 @@ test_expect_success 'clean.requireForce and -f' '
 
 '
 
-test_expect_success C_LOCALE_OUTPUT 'core.excludesfile' '
+test_expect_success 'clean.requireForce and --interactive' '
+	git clean --interactive </dev/null >output 2>error &&
+	test_grep ! "requireForce is true and" error &&
+	test_grep "\*\*\* Commands \*\*\*" output
+'
+
+test_expect_success 'core.excludesfile' '
 
 	echo excludes >excludes &&
 	echo included >included &&
@@ -480,6 +487,7 @@ test_expect_success 'should not clean submodules' '
 		git init &&
 		test_commit msg hello.world
 	) &&
+	test_config_global protocol.file.allow always &&
 	git submodule add ./repo/.git sub1 &&
 	git commit -m "sub1" &&
 	git branch before_sub2 &&
@@ -516,8 +524,12 @@ test_expect_success 'nested (empty) git should be kept' '
 	git init empty_repo &&
 	mkdir to_clean &&
 	>to_clean/should_clean.this &&
+	# Note that we put the expect file in the .git directory so that it
+	# does not get cleaned.
+	find empty_repo | sort >.git/expect &&
 	git clean -f -d &&
-	test_path_is_file empty_repo/.git/HEAD &&
+	find empty_repo | sort >actual &&
+	test_cmp .git/expect actual &&
 	test_path_is_missing to_clean
 '
 
@@ -558,10 +570,10 @@ test_expect_success 'giving path in nested git work tree will NOT remove it' '
 		mkdir -p bar/baz &&
 		test_commit msg bar/baz/hello.world
 	) &&
+	find repo | sort >expect &&
 	git clean -f -d repo/bar/baz &&
-	test_path_is_file repo/.git/HEAD &&
-	test_path_is_dir repo/bar/ &&
-	test_path_is_file repo/bar/baz/hello.world
+	find repo | sort >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success 'giving path to nested .git will not remove it' '
@@ -572,10 +584,10 @@ test_expect_success 'giving path to nested .git will not remove it' '
 		git init &&
 		test_commit msg hello.world
 	) &&
+	find repo | sort >expect &&
 	git clean -f -d repo/.git &&
-	test_path_is_file repo/.git/HEAD &&
-	test_path_is_dir repo/.git/refs &&
-	test_path_is_dir repo/.git/objects &&
+	find repo | sort >actual &&
+	test_cmp expect actual &&
 	test_path_is_dir untracked/
 '
 
@@ -587,9 +599,10 @@ test_expect_success 'giving path to nested .git/ will NOT remove contents' '
 		git init &&
 		test_commit msg hello.world
 	) &&
+	find repo | sort >expect &&
 	git clean -f -d repo/.git/ &&
-	test_path_is_dir repo/.git &&
-	test_path_is_file repo/.git/HEAD &&
+	find repo | sort >actual &&
+	test_cmp expect actual &&
 	test_path_is_dir untracked/
 '
 
@@ -734,7 +747,7 @@ test_expect_success MINGW 'handle clean & core.longpaths = false nicely' '
 	test_must_fail git clean -xdf 2>.git/err &&
 	# grepping for a strerror string is unportable but it is OK here with
 	# MINGW prereq
-	test_i18ngrep "too long" .git/err
+	test_grep "too long" .git/err
 '
 
 test_expect_success 'clean untracked paths by pathspec' '
@@ -746,4 +759,46 @@ test_expect_success 'clean untracked paths by pathspec' '
 	test_must_be_empty actual
 '
 
+test_expect_success 'avoid traversing into ignored directories' '
+	test_when_finished rm -f output error trace.* &&
+	test_create_repo avoid-traversing-deep-hierarchy &&
+	(
+		cd avoid-traversing-deep-hierarchy &&
+
+		mkdir -p untracked/subdir/with/a &&
+		>untracked/subdir/with/a/random-file.txt &&
+
+		GIT_TRACE2_PERF="$TRASH_DIRECTORY/trace.output" \
+		git clean -ffdxn -e untracked
+	) &&
+
+	# Make sure we only visited into the top-level directory, and did
+	# not traverse into the "untracked" subdirectory since it was excluded
+	grep data.*read_directo.*directories-visited trace.output |
+		cut -d "|" -f 9 >trace.relevant &&
+	cat >trace.expect <<-EOF &&
+	 ..directories-visited:1
+	EOF
+	test_cmp trace.expect trace.relevant
+'
+
+test_expect_success 'traverse into directories that may have ignored entries' '
+	test_when_finished rm -f output &&
+	test_create_repo need-to-traverse-into-hierarchy &&
+	(
+		cd need-to-traverse-into-hierarchy &&
+		mkdir -p modules/foobar/src/generated &&
+		> modules/foobar/src/generated/code.c &&
+		> modules/foobar/Makefile &&
+		echo "/modules/**/src/generated/" >.gitignore &&
+
+		git clean -fX modules/foobar >../output &&
+
+		grep Removing ../output &&
+
+		test_path_is_missing modules/foobar/src/generated/code.c &&
+		test_path_is_file modules/foobar/Makefile
+	)
+'
+
 test_done
diff --git a/t/t7301-clean-interactive.sh b/t/t7301-clean-interactive.sh
index a07e8b8..4afe53c 100755
--- a/t/t7301-clean-interactive.sh
+++ b/t/t7301-clean-interactive.sh
@@ -2,6 +2,7 @@
 
 test_description='git clean -i basic tests'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-terminal.sh
 
@@ -24,18 +25,18 @@ test_expect_success 'git clean -i (c: clean hotkey)' '
 	touch a.out src/part3.c src/part3.h src/part4.c src/part4.h \
 	docs/manual.txt obj.o build/lib.so &&
 	echo c | git clean -i &&
-	test -f Makefile &&
-	test -f README &&
-	test -f src/part1.c &&
-	test -f src/part2.c &&
-	test ! -f a.out &&
-	test -f docs/manual.txt &&
-	test ! -f src/part3.c &&
-	test ! -f src/part3.h &&
-	test ! -f src/part4.c &&
-	test ! -f src/part4.h &&
-	test -f obj.o &&
-	test -f build/lib.so
+	test_path_is_file Makefile &&
+	test_path_is_file README &&
+	test_path_is_file src/part1.c &&
+	test_path_is_file src/part2.c &&
+	test_path_is_missing a.out &&
+	test_path_is_file docs/manual.txt &&
+	test_path_is_missing src/part3.c &&
+	test_path_is_missing src/part3.h &&
+	test_path_is_missing src/part4.c &&
+	test_path_is_missing src/part4.h &&
+	test_path_is_file obj.o &&
+	test_path_is_file build/lib.so
 
 '
 
@@ -45,18 +46,18 @@ test_expect_success 'git clean -i (cl: clean prefix)' '
 	touch a.out src/part3.c src/part3.h src/part4.c src/part4.h \
 	docs/manual.txt obj.o build/lib.so &&
 	echo cl | git clean -i &&
-	test -f Makefile &&
-	test -f README &&
-	test -f src/part1.c &&
-	test -f src/part2.c &&
-	test ! -f a.out &&
-	test -f docs/manual.txt &&
-	test ! -f src/part3.c &&
-	test ! -f src/part3.h &&
-	test ! -f src/part4.c &&
-	test ! -f src/part4.h &&
-	test -f obj.o &&
-	test -f build/lib.so
+	test_path_is_file Makefile &&
+	test_path_is_file README &&
+	test_path_is_file src/part1.c &&
+	test_path_is_file src/part2.c &&
+	test_path_is_missing a.out &&
+	test_path_is_file docs/manual.txt &&
+	test_path_is_missing src/part3.c &&
+	test_path_is_missing src/part3.h &&
+	test_path_is_missing src/part4.c &&
+	test_path_is_missing src/part4.h &&
+	test_path_is_file obj.o &&
+	test_path_is_file build/lib.so
 
 '
 
@@ -66,18 +67,18 @@ test_expect_success 'git clean -i (quit)' '
 	touch a.out src/part3.c src/part3.h src/part4.c src/part4.h \
 	docs/manual.txt obj.o build/lib.so &&
 	echo quit | git clean -i &&
-	test -f Makefile &&
-	test -f README &&
-	test -f src/part1.c &&
-	test -f src/part2.c &&
-	test -f a.out &&
-	test -f docs/manual.txt &&
-	test -f src/part3.c &&
-	test -f src/part3.h &&
-	test -f src/part4.c &&
-	test -f src/part4.h &&
-	test -f obj.o &&
-	test -f build/lib.so
+	test_path_is_file Makefile &&
+	test_path_is_file README &&
+	test_path_is_file src/part1.c &&
+	test_path_is_file src/part2.c &&
+	test_path_is_file a.out &&
+	test_path_is_file docs/manual.txt &&
+	test_path_is_file src/part3.c &&
+	test_path_is_file src/part3.h &&
+	test_path_is_file src/part4.c &&
+	test_path_is_file src/part4.h &&
+	test_path_is_file obj.o &&
+	test_path_is_file build/lib.so
 
 '
 
@@ -87,18 +88,18 @@ test_expect_success 'git clean -i (Ctrl+D)' '
 	touch a.out src/part3.c src/part3.h src/part4.c src/part4.h \
 	docs/manual.txt obj.o build/lib.so &&
 	echo "\04" | git clean -i &&
-	test -f Makefile &&
-	test -f README &&
-	test -f src/part1.c &&
-	test -f src/part2.c &&
-	test -f a.out &&
-	test -f docs/manual.txt &&
-	test -f src/part3.c &&
-	test -f src/part3.h &&
-	test -f src/part4.c &&
-	test -f src/part4.h &&
-	test -f obj.o &&
-	test -f build/lib.so
+	test_path_is_file Makefile &&
+	test_path_is_file README &&
+	test_path_is_file src/part1.c &&
+	test_path_is_file src/part2.c &&
+	test_path_is_file a.out &&
+	test_path_is_file docs/manual.txt &&
+	test_path_is_file src/part3.c &&
+	test_path_is_file src/part3.h &&
+	test_path_is_file src/part4.c &&
+	test_path_is_file src/part4.h &&
+	test_path_is_file obj.o &&
+	test_path_is_file build/lib.so
 
 '
 
@@ -109,18 +110,18 @@ test_expect_success 'git clean -id (filter all)' '
 	docs/manual.txt obj.o build/lib.so &&
 	test_write_lines f "*" "" c |
 	git clean -id &&
-	test -f Makefile &&
-	test -f README &&
-	test -f src/part1.c &&
-	test -f src/part2.c &&
-	test -f a.out &&
-	test -f docs/manual.txt &&
-	test -f src/part3.c &&
-	test -f src/part3.h &&
-	test -f src/part4.c &&
-	test -f src/part4.h &&
-	test -f obj.o &&
-	test -f build/lib.so
+	test_path_is_file Makefile &&
+	test_path_is_file README &&
+	test_path_is_file src/part1.c &&
+	test_path_is_file src/part2.c &&
+	test_path_is_file a.out &&
+	test_path_is_file docs/manual.txt &&
+	test_path_is_file src/part3.c &&
+	test_path_is_file src/part3.h &&
+	test_path_is_file src/part4.c &&
+	test_path_is_file src/part4.h &&
+	test_path_is_file obj.o &&
+	test_path_is_file build/lib.so
 
 '
 
@@ -131,18 +132,18 @@ test_expect_success 'git clean -id (filter patterns)' '
 	docs/manual.txt obj.o build/lib.so &&
 	test_write_lines f "part3.* *.out" "" c |
 	git clean -id &&
-	test -f Makefile &&
-	test -f README &&
-	test -f src/part1.c &&
-	test -f src/part2.c &&
-	test -f a.out &&
-	test ! -f docs/manual.txt &&
-	test -f src/part3.c &&
-	test -f src/part3.h &&
-	test ! -f src/part4.c &&
-	test ! -f src/part4.h &&
-	test -f obj.o &&
-	test -f build/lib.so
+	test_path_is_file Makefile &&
+	test_path_is_file README &&
+	test_path_is_file src/part1.c &&
+	test_path_is_file src/part2.c &&
+	test_path_is_file a.out &&
+	test_path_is_missing docs/manual.txt &&
+	test_path_is_file src/part3.c &&
+	test_path_is_file src/part3.h &&
+	test_path_is_missing src/part4.c &&
+	test_path_is_missing src/part4.h &&
+	test_path_is_file obj.o &&
+	test_path_is_file build/lib.so
 
 '
 
@@ -153,18 +154,18 @@ test_expect_success 'git clean -id (filter patterns 2)' '
 	docs/manual.txt obj.o build/lib.so &&
 	test_write_lines f "* !*.out" "" c |
 	git clean -id &&
-	test -f Makefile &&
-	test -f README &&
-	test -f src/part1.c &&
-	test -f src/part2.c &&
-	test ! -f a.out &&
-	test -f docs/manual.txt &&
-	test -f src/part3.c &&
-	test -f src/part3.h &&
-	test -f src/part4.c &&
-	test -f src/part4.h &&
-	test -f obj.o &&
-	test -f build/lib.so
+	test_path_is_file Makefile &&
+	test_path_is_file README &&
+	test_path_is_file src/part1.c &&
+	test_path_is_file src/part2.c &&
+	test_path_is_missing a.out &&
+	test_path_is_file docs/manual.txt &&
+	test_path_is_file src/part3.c &&
+	test_path_is_file src/part3.h &&
+	test_path_is_file src/part4.c &&
+	test_path_is_file src/part4.h &&
+	test_path_is_file obj.o &&
+	test_path_is_file build/lib.so
 
 '
 
@@ -175,18 +176,18 @@ test_expect_success 'git clean -id (select - all)' '
 	docs/manual.txt obj.o build/lib.so &&
 	test_write_lines s "*" "" c |
 	git clean -id &&
-	test -f Makefile &&
-	test -f README &&
-	test -f src/part1.c &&
-	test -f src/part2.c &&
-	test ! -f a.out &&
-	test ! -f docs/manual.txt &&
-	test ! -f src/part3.c &&
-	test ! -f src/part3.h &&
-	test ! -f src/part4.c &&
-	test ! -f src/part4.h &&
-	test -f obj.o &&
-	test -f build/lib.so
+	test_path_is_file Makefile &&
+	test_path_is_file README &&
+	test_path_is_file src/part1.c &&
+	test_path_is_file src/part2.c &&
+	test_path_is_missing a.out &&
+	test_path_is_missing docs/manual.txt &&
+	test_path_is_missing src/part3.c &&
+	test_path_is_missing src/part3.h &&
+	test_path_is_missing src/part4.c &&
+	test_path_is_missing src/part4.h &&
+	test_path_is_file obj.o &&
+	test_path_is_file build/lib.so
 
 '
 
@@ -197,18 +198,18 @@ test_expect_success 'git clean -id (select - none)' '
 	docs/manual.txt obj.o build/lib.so &&
 	test_write_lines s "" c |
 	git clean -id &&
-	test -f Makefile &&
-	test -f README &&
-	test -f src/part1.c &&
-	test -f src/part2.c &&
-	test -f a.out &&
-	test -f docs/manual.txt &&
-	test -f src/part3.c &&
-	test -f src/part3.h &&
-	test -f src/part4.c &&
-	test -f src/part4.h &&
-	test -f obj.o &&
-	test -f build/lib.so
+	test_path_is_file Makefile &&
+	test_path_is_file README &&
+	test_path_is_file src/part1.c &&
+	test_path_is_file src/part2.c &&
+	test_path_is_file a.out &&
+	test_path_is_file docs/manual.txt &&
+	test_path_is_file src/part3.c &&
+	test_path_is_file src/part3.h &&
+	test_path_is_file src/part4.c &&
+	test_path_is_file src/part4.h &&
+	test_path_is_file obj.o &&
+	test_path_is_file build/lib.so
 
 '
 
@@ -219,18 +220,18 @@ test_expect_success 'git clean -id (select - number)' '
 	docs/manual.txt obj.o build/lib.so &&
 	test_write_lines s 3 "" c |
 	git clean -id &&
-	test -f Makefile &&
-	test -f README &&
-	test -f src/part1.c &&
-	test -f src/part2.c &&
-	test -f a.out &&
-	test -f docs/manual.txt &&
-	test ! -f src/part3.c &&
-	test -f src/part3.h &&
-	test -f src/part4.c &&
-	test -f src/part4.h &&
-	test -f obj.o &&
-	test -f build/lib.so
+	test_path_is_file Makefile &&
+	test_path_is_file README &&
+	test_path_is_file src/part1.c &&
+	test_path_is_file src/part2.c &&
+	test_path_is_file a.out &&
+	test_path_is_file docs/manual.txt &&
+	test_path_is_missing src/part3.c &&
+	test_path_is_file src/part3.h &&
+	test_path_is_file src/part4.c &&
+	test_path_is_file src/part4.h &&
+	test_path_is_file obj.o &&
+	test_path_is_file build/lib.so
 
 '
 
@@ -241,18 +242,18 @@ test_expect_success 'git clean -id (select - number 2)' '
 	docs/manual.txt obj.o build/lib.so &&
 	test_write_lines s "2 3" 5 "" c |
 	git clean -id &&
-	test -f Makefile &&
-	test -f README &&
-	test -f src/part1.c &&
-	test -f src/part2.c &&
-	test -f a.out &&
-	test ! -f docs/manual.txt &&
-	test ! -f src/part3.c &&
-	test -f src/part3.h &&
-	test ! -f src/part4.c &&
-	test -f src/part4.h &&
-	test -f obj.o &&
-	test -f build/lib.so
+	test_path_is_file Makefile &&
+	test_path_is_file README &&
+	test_path_is_file src/part1.c &&
+	test_path_is_file src/part2.c &&
+	test_path_is_file a.out &&
+	test_path_is_missing docs/manual.txt &&
+	test_path_is_missing src/part3.c &&
+	test_path_is_file src/part3.h &&
+	test_path_is_missing src/part4.c &&
+	test_path_is_file src/part4.h &&
+	test_path_is_file obj.o &&
+	test_path_is_file build/lib.so
 
 '
 
@@ -263,18 +264,18 @@ test_expect_success 'git clean -id (select - number 3)' '
 	docs/manual.txt obj.o build/lib.so &&
 	test_write_lines s "3,4 5" "" c |
 	git clean -id &&
-	test -f Makefile &&
-	test -f README &&
-	test -f src/part1.c &&
-	test -f src/part2.c &&
-	test -f a.out &&
-	test -f docs/manual.txt &&
-	test ! -f src/part3.c &&
-	test ! -f src/part3.h &&
-	test ! -f src/part4.c &&
-	test -f src/part4.h &&
-	test -f obj.o &&
-	test -f build/lib.so
+	test_path_is_file Makefile &&
+	test_path_is_file README &&
+	test_path_is_file src/part1.c &&
+	test_path_is_file src/part2.c &&
+	test_path_is_file a.out &&
+	test_path_is_file docs/manual.txt &&
+	test_path_is_missing src/part3.c &&
+	test_path_is_missing src/part3.h &&
+	test_path_is_missing src/part4.c &&
+	test_path_is_file src/part4.h &&
+	test_path_is_file obj.o &&
+	test_path_is_file build/lib.so
 
 '
 
@@ -284,11 +285,11 @@ test_expect_success 'git clean -id (select - filenames)' '
 	touch a.out foo.txt bar.txt baz.txt &&
 	test_write_lines s "a.out fo ba bar" "" c |
 	git clean -id &&
-	test -f Makefile &&
-	test ! -f a.out &&
-	test ! -f foo.txt &&
-	test ! -f bar.txt &&
-	test -f baz.txt &&
+	test_path_is_file Makefile &&
+	test_path_is_missing a.out &&
+	test_path_is_missing foo.txt &&
+	test_path_is_missing bar.txt &&
+	test_path_is_file baz.txt &&
 	rm baz.txt
 
 '
@@ -300,18 +301,18 @@ test_expect_success 'git clean -id (select - range)' '
 	docs/manual.txt obj.o build/lib.so &&
 	test_write_lines s "1,3-4" 2 "" c |
 	git clean -id &&
-	test -f Makefile &&
-	test -f README &&
-	test -f src/part1.c &&
-	test -f src/part2.c &&
-	test ! -f a.out &&
-	test ! -f src/part3.c &&
-	test ! -f src/part3.h &&
-	test -f src/part4.c &&
-	test -f src/part4.h &&
-	test ! -f docs/manual.txt &&
-	test -f obj.o &&
-	test -f build/lib.so
+	test_path_is_file Makefile &&
+	test_path_is_file README &&
+	test_path_is_file src/part1.c &&
+	test_path_is_file src/part2.c &&
+	test_path_is_missing a.out &&
+	test_path_is_missing src/part3.c &&
+	test_path_is_missing src/part3.h &&
+	test_path_is_file src/part4.c &&
+	test_path_is_file src/part4.h &&
+	test_path_is_missing docs/manual.txt &&
+	test_path_is_file obj.o &&
+	test_path_is_file build/lib.so
 
 '
 
@@ -322,18 +323,18 @@ test_expect_success 'git clean -id (select - range 2)' '
 	docs/manual.txt obj.o build/lib.so &&
 	test_write_lines s "4- 1" "" c |
 	git clean -id &&
-	test -f Makefile &&
-	test -f README &&
-	test -f src/part1.c &&
-	test -f src/part2.c &&
-	test ! -f a.out &&
-	test -f docs/manual.txt &&
-	test -f src/part3.c &&
-	test ! -f src/part3.h &&
-	test ! -f src/part4.c &&
-	test ! -f src/part4.h &&
-	test -f obj.o &&
-	test -f build/lib.so
+	test_path_is_file Makefile &&
+	test_path_is_file README &&
+	test_path_is_file src/part1.c &&
+	test_path_is_file src/part2.c &&
+	test_path_is_missing a.out &&
+	test_path_is_file docs/manual.txt &&
+	test_path_is_file src/part3.c &&
+	test_path_is_missing src/part3.h &&
+	test_path_is_missing src/part4.c &&
+	test_path_is_missing src/part4.h &&
+	test_path_is_file obj.o &&
+	test_path_is_file build/lib.so
 
 '
 
@@ -344,18 +345,18 @@ test_expect_success 'git clean -id (inverse select)' '
 	docs/manual.txt obj.o build/lib.so &&
 	test_write_lines s "*" "-5- 1 -2" "" c |
 	git clean -id &&
-	test -f Makefile &&
-	test -f README &&
-	test -f src/part1.c &&
-	test -f src/part2.c &&
-	test ! -f a.out &&
-	test -f docs/manual.txt &&
-	test ! -f src/part3.c &&
-	test ! -f src/part3.h &&
-	test -f src/part4.c &&
-	test -f src/part4.h &&
-	test -f obj.o &&
-	test -f build/lib.so
+	test_path_is_file Makefile &&
+	test_path_is_file README &&
+	test_path_is_file src/part1.c &&
+	test_path_is_file src/part2.c &&
+	test_path_is_missing a.out &&
+	test_path_is_file docs/manual.txt &&
+	test_path_is_missing src/part3.c &&
+	test_path_is_missing src/part3.h &&
+	test_path_is_file src/part4.c &&
+	test_path_is_file src/part4.h &&
+	test_path_is_file obj.o &&
+	test_path_is_file build/lib.so
 
 '
 
@@ -366,18 +367,18 @@ test_expect_success 'git clean -id (ask)' '
 	docs/manual.txt obj.o build/lib.so &&
 	test_write_lines a Y y no yes bad "" |
 	git clean -id &&
-	test -f Makefile &&
-	test -f README &&
-	test -f src/part1.c &&
-	test -f src/part2.c &&
-	test ! -f a.out &&
-	test ! -f docs/manual.txt &&
-	test -f src/part3.c &&
-	test ! -f src/part3.h &&
-	test -f src/part4.c &&
-	test -f src/part4.h &&
-	test -f obj.o &&
-	test -f build/lib.so
+	test_path_is_file Makefile &&
+	test_path_is_file README &&
+	test_path_is_file src/part1.c &&
+	test_path_is_file src/part2.c &&
+	test_path_is_missing a.out &&
+	test_path_is_missing docs/manual.txt &&
+	test_path_is_file src/part3.c &&
+	test_path_is_missing src/part3.h &&
+	test_path_is_file src/part4.c &&
+	test_path_is_file src/part4.h &&
+	test_path_is_file obj.o &&
+	test_path_is_file build/lib.so
 
 '
 
@@ -388,18 +389,18 @@ test_expect_success 'git clean -id (ask - Ctrl+D)' '
 	docs/manual.txt obj.o build/lib.so &&
 	test_write_lines a Y no yes "\04" |
 	git clean -id &&
-	test -f Makefile &&
-	test -f README &&
-	test -f src/part1.c &&
-	test -f src/part2.c &&
-	test ! -f a.out &&
-	test -f docs/manual.txt &&
-	test ! -f src/part3.c &&
-	test -f src/part3.h &&
-	test -f src/part4.c &&
-	test -f src/part4.h &&
-	test -f obj.o &&
-	test -f build/lib.so
+	test_path_is_file Makefile &&
+	test_path_is_file README &&
+	test_path_is_file src/part1.c &&
+	test_path_is_file src/part2.c &&
+	test_path_is_missing a.out &&
+	test_path_is_file docs/manual.txt &&
+	test_path_is_missing src/part3.c &&
+	test_path_is_file src/part3.h &&
+	test_path_is_file src/part4.c &&
+	test_path_is_file src/part4.h &&
+	test_path_is_file obj.o &&
+	test_path_is_file build/lib.so
 
 '
 
@@ -411,18 +412,18 @@ test_expect_success 'git clean -id with prefix and path (filter)' '
 	(cd build/ &&
 	 test_write_lines f docs "*.h" "" c |
 	 git clean -id ..) &&
-	test -f Makefile &&
-	test -f README &&
-	test -f src/part1.c &&
-	test -f src/part2.c &&
-	test ! -f a.out &&
-	test -f docs/manual.txt &&
-	test ! -f src/part3.c &&
-	test -f src/part3.h &&
-	test ! -f src/part4.c &&
-	test -f src/part4.h &&
-	test -f obj.o &&
-	test -f build/lib.so
+	test_path_is_file Makefile &&
+	test_path_is_file README &&
+	test_path_is_file src/part1.c &&
+	test_path_is_file src/part2.c &&
+	test_path_is_missing a.out &&
+	test_path_is_file docs/manual.txt &&
+	test_path_is_missing src/part3.c &&
+	test_path_is_file src/part3.h &&
+	test_path_is_missing src/part4.c &&
+	test_path_is_file src/part4.h &&
+	test_path_is_file obj.o &&
+	test_path_is_file build/lib.so
 
 '
 
@@ -434,18 +435,18 @@ test_expect_success 'git clean -id with prefix and path (select by name)' '
 	(cd build/ &&
 	 test_write_lines s ../docs/ ../src/part3.c ../src/part4.c "" c |
 	 git clean -id ..) &&
-	test -f Makefile &&
-	test -f README &&
-	test -f src/part1.c &&
-	test -f src/part2.c &&
-	test -f a.out &&
-	test ! -f docs/manual.txt &&
-	test ! -f src/part3.c &&
-	test -f src/part3.h &&
-	test ! -f src/part4.c &&
-	test -f src/part4.h &&
-	test -f obj.o &&
-	test -f build/lib.so
+	test_path_is_file Makefile &&
+	test_path_is_file README &&
+	test_path_is_file src/part1.c &&
+	test_path_is_file src/part2.c &&
+	test_path_is_file a.out &&
+	test_path_is_missing docs/manual.txt &&
+	test_path_is_missing src/part3.c &&
+	test_path_is_file src/part3.h &&
+	test_path_is_missing src/part4.c &&
+	test_path_is_file src/part4.h &&
+	test_path_is_file obj.o &&
+	test_path_is_file build/lib.so
 
 '
 
@@ -457,18 +458,18 @@ test_expect_success 'git clean -id with prefix and path (ask)' '
 	(cd build/ &&
 	 test_write_lines a Y y no yes bad "" |
 	 git clean -id ..) &&
-	test -f Makefile &&
-	test -f README &&
-	test -f src/part1.c &&
-	test -f src/part2.c &&
-	test ! -f a.out &&
-	test ! -f docs/manual.txt &&
-	test -f src/part3.c &&
-	test ! -f src/part3.h &&
-	test -f src/part4.c &&
-	test -f src/part4.h &&
-	test -f obj.o &&
-	test -f build/lib.so
+	test_path_is_file Makefile &&
+	test_path_is_file README &&
+	test_path_is_file src/part1.c &&
+	test_path_is_file src/part2.c &&
+	test_path_is_missing a.out &&
+	test_path_is_missing docs/manual.txt &&
+	test_path_is_file src/part3.c &&
+	test_path_is_missing src/part3.h &&
+	test_path_is_file src/part4.c &&
+	test_path_is_file src/part4.h &&
+	test_path_is_file obj.o &&
+	test_path_is_file build/lib.so
 
 '
 
diff --git a/t/t7400-submodule-basic.sh b/t/t7400-submodule-basic.sh
index fec7e02..5c4a89d 100755
--- a/t/t7400-submodule-basic.sh
+++ b/t/t7400-submodule-basic.sh
@@ -9,8 +9,41 @@ This test tries to verify basic sanity of the init, update and status
 subcommands of git submodule.
 '
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
+test_expect_success 'setup - enable local submodules' '
+	git config --global protocol.file.allow always
+'
+
+test_expect_success 'submodule usage: -h' '
+	git submodule -h >out 2>err &&
+	grep "^usage: git submodule" out &&
+	test_must_be_empty err
+'
+
+test_expect_success 'submodule usage: --recursive' '
+	test_expect_code 1 git submodule --recursive >out 2>err &&
+	grep "^usage: git submodule" err &&
+	test_must_be_empty out
+'
+
+test_expect_success 'submodule usage: status --' '
+	test_expect_code 1 git submodule -- &&
+	test_expect_code 1 git submodule --end-of-options
+'
+
+for opt in '--quiet' '--cached'
+do
+	test_expect_success "submodule usage: status $opt" '
+		git submodule $opt &&
+		git submodule status $opt &&
+		git submodule $opt status
+	'
+done
+
 test_expect_success 'submodule deinit works on empty repository' '
 	git submodule deinit --all
 '
@@ -27,7 +60,7 @@ test_expect_success 'submodule init aborts on missing .gitmodules file' '
 	git update-index --add --cacheinfo 160000,$(git rev-parse HEAD),sub &&
 	# missing the .gitmodules file here
 	test_must_fail git submodule init 2>actual &&
-	test_i18ngrep "No url found for submodule path" actual
+	test_grep "No url found for submodule path" actual
 '
 
 test_expect_success 'submodule update aborts on missing .gitmodules file' '
@@ -35,7 +68,7 @@ test_expect_success 'submodule update aborts on missing .gitmodules file' '
 	git update-index --add --cacheinfo 160000,$(git rev-parse HEAD),sub &&
 	# missing the .gitmodules file here
 	git submodule update sub 2>actual &&
-	test_i18ngrep "Submodule path .sub. not initialized" actual
+	test_grep "Submodule path .sub. not initialized" actual
 '
 
 test_expect_success 'submodule update aborts on missing gitmodules url' '
@@ -48,11 +81,11 @@ test_expect_success 'submodule update aborts on missing gitmodules url' '
 
 test_expect_success 'add aborts on repository with no commits' '
 	cat >expect <<-\EOF &&
-	'"'repo-no-commits'"' does not have a commit checked out
+	fatal: '"'repo-no-commits'"' does not have a commit checked out
 	EOF
 	git init repo-no-commits &&
 	test_must_fail git submodule add ../a ./repo-no-commits 2>actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 test_expect_success 'status should ignore inner git repo when not added' '
@@ -67,7 +100,7 @@ test_expect_success 'status should ignore inner git repo when not added' '
 	) &&
 	test_must_fail git submodule status inner 2>output.err &&
 	rm -fr inner &&
-	test_i18ngrep "^error: .*did not match any file(s) known to git" output.err
+	test_grep "^error: .*did not match any file(s) known to git" output.err
 '
 
 test_expect_success 'setup - repository in init subdirectory' '
@@ -124,7 +157,7 @@ inspect() {
 }
 
 test_expect_success 'submodule add' '
-	echo "refs/heads/master" >expect &&
+	echo "refs/heads/main" >expect &&
 
 	(
 		cd addtest &&
@@ -149,6 +182,11 @@ test_expect_success 'submodule add' '
 	test_must_be_empty untracked
 '
 
+test_expect_success !WINDOWS 'submodule add (absolute path)' '
+	test_when_finished "git reset --hard" &&
+	git submodule add "$submodurl" "$submodurl/add-abs"
+'
+
 test_expect_success 'setup parent and one repository' '
 	test_create_repo parent &&
 	test_commit -C parent one
@@ -158,7 +196,7 @@ test_expect_success 'redirected submodule add does not show progress' '
 	git -C addtest submodule add "file://$submodurl/parent" submod-redirected \
 		2>err &&
 	! grep % err &&
-	test_i18ngrep ! "Checking connectivity" err
+	test_grep ! "Checking connectivity" err
 '
 
 test_expect_success 'redirected submodule add --progress does show progress' '
@@ -174,15 +212,14 @@ test_expect_success 'submodule add to .gitignored path fails' '
 		The following paths are ignored by one of your .gitignore files:
 		submod
 		hint: Use -f if you really want to add them.
-		hint: Turn this message off by running
-		hint: "git config advice.addIgnoredFile false"
+		hint: Disable this message with "git config advice.addIgnoredFile false"
 		EOF
 		# Does not use test_commit due to the ignore
 		echo "*" > .gitignore &&
 		git add --force .gitignore &&
 		git commit -m"Ignore everything" &&
 		! git submodule add "$submodurl" submod >actual 2>&1 &&
-		test_i18ncmp expect actual
+		test_cmp expect actual
 	)
 '
 
@@ -193,6 +230,17 @@ test_expect_success 'submodule add to .gitignored path with --force' '
 	)
 '
 
+test_expect_success 'submodule add to path with tracked content fails' '
+	(
+		cd addtest &&
+		echo "fatal: '\''dir-tracked'\'' already exists in the index" >expect &&
+		mkdir dir-tracked &&
+		test_commit foo dir-tracked/bar &&
+		test_must_fail git submodule add "$submodurl" dir-tracked >actual 2>&1 &&
+		test_cmp expect actual
+	)
+'
+
 test_expect_success 'submodule add to reconfigure existing submodule with --force' '
 	(
 		cd addtest-ignore &&
@@ -214,7 +262,7 @@ test_expect_success 'submodule add relays add --dry-run stderr' '
 		cd addtest &&
 		: >.git/index.lock &&
 		! git submodule add "$submodurl" sub-while-locked 2>output.err &&
-		test_i18ngrep "^fatal: .*index\.lock" output.err &&
+		test_grep "^fatal: .*index\.lock" output.err &&
 		test_path_is_missing sub-while-locked
 	)
 '
@@ -223,7 +271,7 @@ test_expect_success 'submodule add --branch' '
 	echo "refs/heads/initial" >expect-head &&
 	cat <<-\EOF >expect-heads &&
 	refs/heads/initial
-	refs/heads/master
+	refs/heads/main
 	EOF
 
 	(
@@ -241,7 +289,7 @@ test_expect_success 'submodule add --branch' '
 '
 
 test_expect_success 'submodule add with ./ in path' '
-	echo "refs/heads/master" >expect &&
+	echo "refs/heads/main" >expect &&
 
 	(
 		cd addtest &&
@@ -257,7 +305,7 @@ test_expect_success 'submodule add with ./ in path' '
 '
 
 test_expect_success 'submodule add with /././ in path' '
-	echo "refs/heads/master" >expect &&
+	echo "refs/heads/main" >expect &&
 
 	(
 		cd addtest &&
@@ -273,7 +321,7 @@ test_expect_success 'submodule add with /././ in path' '
 '
 
 test_expect_success 'submodule add with // in path' '
-	echo "refs/heads/master" >expect &&
+	echo "refs/heads/main" >expect &&
 
 	(
 		cd addtest &&
@@ -289,7 +337,7 @@ test_expect_success 'submodule add with // in path' '
 '
 
 test_expect_success 'submodule add with /.. in path' '
-	echo "refs/heads/master" >expect &&
+	echo "refs/heads/main" >expect &&
 
 	(
 		cd addtest &&
@@ -305,7 +353,7 @@ test_expect_success 'submodule add with /.. in path' '
 '
 
 test_expect_success 'submodule add with ./, /.. and // in path' '
-	echo "refs/heads/master" >expect &&
+	echo "refs/heads/main" >expect &&
 
 	(
 		cd addtest &&
@@ -335,7 +383,7 @@ test_expect_success !CYGWIN 'submodule add with \\ in path' '
 '
 
 test_expect_success 'submodule add in subdirectory' '
-	echo "refs/heads/master" >expect &&
+	echo "refs/heads/main" >expect &&
 
 	mkdir addtest/sub &&
 	(
@@ -356,7 +404,7 @@ test_expect_success 'submodule add in subdirectory with relative path should fai
 		cd addtest/sub &&
 		test_must_fail git submodule add ../../ submod3 2>../../output.err
 	) &&
-	test_i18ngrep toplevel output.err
+	test_grep toplevel output.err
 '
 
 test_expect_success 'setup - add an example entry to .gitmodules' '
@@ -437,7 +485,7 @@ test_expect_success 'status should still be "missing" after initializing' '
 
 test_failure_with_unknown_submodule () {
 	test_must_fail git submodule $1 no-such-submodule 2>output.err &&
-	test_i18ngrep "^error: .*no-such-submodule" output.err
+	test_grep "^error: .*no-such-submodule" output.err
 }
 
 test_expect_success 'init should fail with unknown submodule' '
@@ -530,6 +578,16 @@ test_expect_success 'status should be "modified" after submodule commit' '
 	grep "^+$rev2" list
 '
 
+test_expect_success '"submodule --cached" command forms should be identical' '
+	git submodule status --cached >expect &&
+
+	git submodule --cached >actual &&
+	test_cmp expect actual &&
+
+	git submodule --cached status >actual &&
+	test_cmp expect actual
+'
+
 test_expect_success 'the --cached sha1 should be rev1' '
 	git submodule --cached status >list &&
 	grep "^+$rev1" list
@@ -557,7 +615,7 @@ test_expect_success 'status should be "up-to-date" after update' '
 
 test_expect_success 'checkout superproject with subproject already present' '
 	git checkout initial &&
-	git checkout master
+	git checkout main
 '
 
 test_expect_success 'apply submodule diff' '
@@ -574,7 +632,7 @@ test_expect_success 'apply submodule diff' '
 	git checkout second &&
 	git apply --index P.diff &&
 
-	git diff --cached master >staged &&
+	git diff --cached main >staged &&
 	test_must_be_empty staged
 '
 
@@ -585,7 +643,7 @@ test_expect_success 'update --init' '
 	test_must_fail git config submodule.example.url &&
 
 	git submodule update init 2> update.out &&
-	test_i18ngrep "not initialized" update.out &&
+	test_grep "not initialized" update.out &&
 	test_must_fail git rev-parse --resolve-git-dir init/.git &&
 
 	git submodule update --init init &&
@@ -602,7 +660,7 @@ test_expect_success 'update --init from subdirectory' '
 	(
 		cd sub &&
 		git submodule update ../init 2>update.out &&
-		test_i18ngrep "not initialized" update.out &&
+		test_grep "not initialized" update.out &&
 		test_must_fail git rev-parse --resolve-git-dir ../init/.git &&
 
 		git submodule update --init ../init
@@ -1062,7 +1120,7 @@ test_expect_success 'submodule deinit from subdirectory' '
 		cd sub &&
 		git submodule deinit ../init >../output
 	) &&
-	test_i18ngrep "\\.\\./init" output &&
+	test_grep "\\.\\./init" output &&
 	test -z "$(git config --get-regexp "submodule\.example\.")" &&
 	test -n "$(git config --get-regexp "submodule\.example2\.")" &&
 	test -f example2/.git &&
@@ -1077,8 +1135,8 @@ test_expect_success 'submodule deinit . deinits all initialized submodules' '
 	git submodule deinit . >actual &&
 	test -z "$(git config --get-regexp "submodule\.example\.")" &&
 	test -z "$(git config --get-regexp "submodule\.example2\.")" &&
-	test_i18ngrep "Cleared directory .init" actual &&
-	test_i18ngrep "Cleared directory .example2" actual &&
+	test_grep "Cleared directory .init" actual &&
+	test_grep "Cleared directory .example2" actual &&
 	rmdir init example2
 '
 
@@ -1090,8 +1148,8 @@ test_expect_success 'submodule deinit --all deinits all initialized submodules'
 	git submodule deinit --all >actual &&
 	test -z "$(git config --get-regexp "submodule\.example\.")" &&
 	test -z "$(git config --get-regexp "submodule\.example2\.")" &&
-	test_i18ngrep "Cleared directory .init" actual &&
-	test_i18ngrep "Cleared directory .example2" actual &&
+	test_grep "Cleared directory .init" actual &&
+	test_grep "Cleared directory .example2" actual &&
 	rmdir init example2
 '
 
@@ -1101,8 +1159,8 @@ test_expect_success 'submodule deinit deinits a submodule when its work tree is
 	git submodule deinit init example2 >actual &&
 	test -z "$(git config --get-regexp "submodule\.example\.")" &&
 	test -z "$(git config --get-regexp "submodule\.example2\.")" &&
-	test_i18ngrep ! "Cleared directory .init" actual &&
-	test_i18ngrep "Cleared directory .example2" actual &&
+	test_grep ! "Cleared directory .init" actual &&
+	test_grep "Cleared directory .example2" actual &&
 	rmdir init
 '
 
@@ -1114,7 +1172,7 @@ test_expect_success 'submodule deinit fails when the submodule contains modifica
 	test -f example2/.git &&
 	git submodule deinit -f init >actual &&
 	test -z "$(git config --get-regexp "submodule\.example\.")" &&
-	test_i18ngrep "Cleared directory .init" actual &&
+	test_grep "Cleared directory .init" actual &&
 	rmdir init
 '
 
@@ -1126,7 +1184,7 @@ test_expect_success 'submodule deinit fails when the submodule contains untracke
 	test -f example2/.git &&
 	git submodule deinit -f init >actual &&
 	test -z "$(git config --get-regexp "submodule\.example\.")" &&
-	test_i18ngrep "Cleared directory .init" actual &&
+	test_grep "Cleared directory .init" actual &&
 	rmdir init
 '
 
@@ -1141,45 +1199,44 @@ test_expect_success 'submodule deinit fails when the submodule HEAD does not mat
 	test -f example2/.git &&
 	git submodule deinit -f init >actual &&
 	test -z "$(git config --get-regexp "submodule\.example\.")" &&
-	test_i18ngrep "Cleared directory .init" actual &&
+	test_grep "Cleared directory .init" actual &&
 	rmdir init
 '
 
 test_expect_success 'submodule deinit is silent when used on an uninitialized submodule' '
 	git submodule update --init &&
 	git submodule deinit init >actual &&
-	test_i18ngrep "Submodule .example. (.*) unregistered for path .init" actual &&
-	test_i18ngrep "Cleared directory .init" actual &&
+	test_grep "Submodule .example. (.*) unregistered for path .init" actual &&
+	test_grep "Cleared directory .init" actual &&
 	git submodule deinit init >actual &&
-	test_i18ngrep ! "Submodule .example. (.*) unregistered for path .init" actual &&
-	test_i18ngrep "Cleared directory .init" actual &&
+	test_grep ! "Submodule .example. (.*) unregistered for path .init" actual &&
+	test_grep "Cleared directory .init" actual &&
 	git submodule deinit . >actual &&
-	test_i18ngrep ! "Submodule .example. (.*) unregistered for path .init" actual &&
-	test_i18ngrep "Submodule .example2. (.*) unregistered for path .example2" actual &&
-	test_i18ngrep "Cleared directory .init" actual &&
+	test_grep ! "Submodule .example. (.*) unregistered for path .init" actual &&
+	test_grep "Submodule .example2. (.*) unregistered for path .example2" actual &&
+	test_grep "Cleared directory .init" actual &&
 	git submodule deinit . >actual &&
-	test_i18ngrep ! "Submodule .example. (.*) unregistered for path .init" actual &&
-	test_i18ngrep ! "Submodule .example2. (.*) unregistered for path .example2" actual &&
-	test_i18ngrep "Cleared directory .init" actual &&
+	test_grep ! "Submodule .example. (.*) unregistered for path .init" actual &&
+	test_grep ! "Submodule .example2. (.*) unregistered for path .example2" actual &&
+	test_grep "Cleared directory .init" actual &&
 	git submodule deinit --all >actual &&
-	test_i18ngrep ! "Submodule .example. (.*) unregistered for path .init" actual &&
-	test_i18ngrep ! "Submodule .example2. (.*) unregistered for path .example2" actual &&
-	test_i18ngrep "Cleared directory .init" actual &&
+	test_grep ! "Submodule .example. (.*) unregistered for path .init" actual &&
+	test_grep ! "Submodule .example2. (.*) unregistered for path .example2" actual &&
+	test_grep "Cleared directory .init" actual &&
 	rmdir init example2
 '
 
-test_expect_success 'submodule deinit fails when submodule has a .git directory even when forced' '
+test_expect_success 'submodule deinit absorbs .git directory if .git is a directory' '
 	git submodule update --init &&
 	(
 		cd init &&
 		rm .git &&
-		cp -R ../.git/modules/example .git &&
+		mv ../.git/modules/example .git &&
 		GIT_WORK_TREE=. git config --unset core.worktree
 	) &&
-	test_must_fail git submodule deinit init &&
-	test_must_fail git submodule deinit -f init &&
-	test -d init/.git &&
-	test -n "$(git config --get-regexp "submodule\.example\.")"
+	git submodule deinit init &&
+	test_path_is_missing init/.git &&
+	test -z "$(git config --get-regexp "submodule\.example\.")"
 '
 
 test_expect_success 'submodule with UTF-8 name' '
@@ -1211,31 +1268,6 @@ test_expect_success 'submodule add clone shallow submodule' '
 	)
 '
 
-test_expect_success 'submodule helper list is not confused by common prefixes' '
-	mkdir -p dir1/b &&
-	(
-		cd dir1/b &&
-		git init &&
-		echo hi >testfile2 &&
-		git add . &&
-		git commit -m "test1"
-	) &&
-	mkdir -p dir2/b &&
-	(
-		cd dir2/b &&
-		git init &&
-		echo hello >testfile1 &&
-		git add .  &&
-		git commit -m "test2"
-	) &&
-	git submodule add /dir1/b dir1/b &&
-	git submodule add /dir2/b dir2/b &&
-	git commit -m "first submodule commit" &&
-	git submodule--helper list dir1/b | cut -f 2 >actual &&
-	echo "dir1/b" >expect &&
-	test_cmp expect actual
-'
-
 test_expect_success 'setup superproject with submodules' '
 	git init sub1 &&
 	test_commit -C sub1 test &&
@@ -1318,6 +1350,22 @@ test_expect_success 'clone active submodule without submodule url set' '
 	)
 '
 
+test_expect_success 'update submodules without url set in .gitconfig' '
+	test_when_finished "rm -rf multisuper_clone" &&
+	git clone file://"$pwd"/multisuper multisuper_clone &&
+
+	git -C multisuper_clone submodule init &&
+	for s in sub0 sub1 sub2 sub3
+	do
+		key=submodule.$s.url &&
+		git -C multisuper_clone config --local --unset $key &&
+		git -C multisuper_clone config --file .gitmodules --unset $key || return 1
+	done &&
+
+	test_must_fail git -C multisuper_clone submodule update 2>err &&
+	grep "cannot clone submodule .sub[0-3]. without a URL" err
+'
+
 test_expect_success 'clone --recurse-submodules with a pathspec works' '
 	test_when_finished "rm -rf multisuper_clone" &&
 	cat >expected <<-\EOF &&
diff --git a/t/t7401-submodule-summary.sh b/t/t7401-submodule-summary.sh
index 9bc841d..542b333 100755
--- a/t/t7401-submodule-summary.sh
+++ b/t/t7401-submodule-summary.sh
@@ -5,9 +5,19 @@
 
 test_description='Summary support for submodules
 
-This test tries to verify the sanity of summary subcommand of git submodule.
+This test script tries to verify the sanity of summary subcommand of git submodule.
 '
 
+# NOTE: This test script uses 'git add' instead of 'git submodule add' to add
+# submodules to the superproject. Some submodule subcommands such as init and
+# deinit might not work as expected in this script. t7421 does not have this
+# caveat.
+#
+# NEEDSWORK: This test script is old fashioned and may need a big cleanup due to
+# various reasons, one of them being that there are lots of commands taking place
+# outside of 'test_expect_success' block, which is no longer in good-style.
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 add_file () {
@@ -16,12 +26,12 @@ add_file () {
 	owd=$(pwd)
 	cd "$sm"
 	for name; do
-		echo "$name" > "$name" &&
+		echo "$name" >"$name" &&
 		git add "$name" &&
 		test_tick &&
 		git commit -m "Add $name"
 	done >/dev/null
-	git rev-parse --verify HEAD | cut -c1-7
+	git rev-parse --short HEAD
 	cd "$owd"
 }
 commit_file () {
@@ -38,10 +48,10 @@ test_expect_success 'added submodule' "
 	git add sm1 &&
 	git submodule summary >actual &&
 	cat >expected <<-EOF &&
-* sm1 0000000...$head1 (2):
-  > Add foo2
+	* sm1 0000000...$head1 (2):
+	  > Add foo2
 
-EOF
+	EOF
 	test_cmp expected actual
 "
 
@@ -52,10 +62,10 @@ test_expect_success 'added submodule (subdirectory)' "
 		git submodule summary >../actual
 	) &&
 	cat >expected <<-EOF &&
-* ../sm1 0000000...$head1 (2):
-  > Add foo2
+	* ../sm1 0000000...$head1 (2):
+	  > Add foo2
 
-EOF
+	EOF
 	test_cmp expected actual
 "
 
@@ -73,10 +83,10 @@ test_expect_success 'added submodule (subdirectory with explicit path)' "
 		git submodule summary ../sm1 >../actual
 	) &&
 	cat >expected <<-EOF &&
-* ../sm1 0000000...$head1 (2):
-  > Add foo2
+	* ../sm1 0000000...$head1 (2):
+	  > Add foo2
 
-EOF
+	EOF
 	test_cmp expected actual
 "
 
@@ -86,20 +96,20 @@ head2=$(add_file sm1 foo3)
 test_expect_success 'modified submodule(forward)' "
 	git submodule summary >actual &&
 	cat >expected <<-EOF &&
-* sm1 $head1...$head2 (1):
-  > Add foo3
+	* sm1 $head1...$head2 (1):
+	  > Add foo3
 
-EOF
+	EOF
 	test_cmp expected actual
 "
 
 test_expect_success 'modified submodule(forward), --files' "
 	git submodule summary --files >actual &&
 	cat >expected <<-EOF &&
-* sm1 $head1...$head2 (1):
-  > Add foo3
+	* sm1 $head1...$head2 (1):
+	  > Add foo3
 
-EOF
+	EOF
 	test_cmp expected actual
 "
 
@@ -110,10 +120,10 @@ test_expect_success 'no ignore=all setting has any effect' "
 	git config diff.ignoreSubmodules all &&
 	git submodule summary >actual &&
 	cat >expected <<-EOF &&
-* sm1 $head1...$head2 (1):
-  > Add foo3
+	* sm1 $head1...$head2 (1):
+	  > Add foo3
 
-EOF
+	EOF
 	test_cmp expected actual &&
 	git config --unset diff.ignoreSubmodules &&
 	git config --remove-section submodule.sm1 &&
@@ -125,17 +135,17 @@ commit_file sm1 &&
 head3=$(
 	cd sm1 &&
 	git reset --hard HEAD~2 >/dev/null &&
-	git rev-parse --verify HEAD | cut -c1-7
+	git rev-parse --short HEAD
 )
 
 test_expect_success 'modified submodule(backward)' "
 	git submodule summary >actual &&
 	cat >expected <<-EOF &&
-* sm1 $head2...$head3 (2):
-  < Add foo3
-  < Add foo2
+	* sm1 $head2...$head3 (2):
+	  < Add foo3
+	  < Add foo2
 
-EOF
+	EOF
 	test_cmp expected actual
 "
 
@@ -144,25 +154,25 @@ head4_full=$(GIT_DIR=sm1/.git git rev-parse --verify HEAD)
 test_expect_success 'modified submodule(backward and forward)' "
 	git submodule summary >actual &&
 	cat >expected <<-EOF &&
-* sm1 $head2...$head4 (4):
-  > Add foo5
-  > Add foo4
-  < Add foo3
-  < Add foo2
+	* sm1 $head2...$head4 (4):
+	  > Add foo5
+	  > Add foo4
+	  < Add foo3
+	  < Add foo2
 
-EOF
+	EOF
 	test_cmp expected actual
 "
 
 test_expect_success '--summary-limit' "
 	git submodule summary -n 3 >actual &&
 	cat >expected <<-EOF &&
-* sm1 $head2...$head4 (4):
-  > Add foo5
-  > Add foo4
-  < Add foo3
+	* sm1 $head2...$head4 (4):
+	  > Add foo5
+	  > Add foo4
+	  < Add foo3
 
-EOF
+	EOF
 	test_cmp expected actual
 "
 
@@ -177,21 +187,21 @@ mv sm1-bak sm1
 test_expect_success 'typechanged submodule(submodule->blob), --cached' "
 	git submodule summary --cached >actual &&
 	cat >expected <<-EOF &&
-* sm1 $head4(submodule)->$head5(blob) (3):
-  < Add foo5
+	* sm1 $head4(submodule)->$head5(blob) (3):
+	  < Add foo5
 
-EOF
-	test_i18ncmp actual expected
+	EOF
+	test_cmp expected actual
 "
 
 test_expect_success 'typechanged submodule(submodule->blob), --files' "
 	git submodule summary --files >actual &&
 	cat >expected <<-EOF &&
-* sm1 $head5(blob)->$head4(submodule) (3):
-  > Add foo5
+	* sm1 $head5(blob)->$head4(submodule) (3):
+	  > Add foo5
 
-EOF
-	test_i18ncmp actual expected
+	EOF
+	test_cmp expected actual
 "
 
 rm -rf sm1 &&
@@ -199,10 +209,10 @@ git checkout-index sm1
 test_expect_success 'typechanged submodule(submodule->blob)' "
 	git submodule summary >actual &&
 	cat >expected <<-EOF &&
-* sm1 $head4(submodule)->$head5(blob):
+	* sm1 $head4(submodule)->$head5(blob):
 
-EOF
-	test_i18ncmp actual expected
+	EOF
+	test_cmp expected actual
 "
 
 rm -f sm1 &&
@@ -211,22 +221,22 @@ head6=$(add_file sm1 foo6 foo7)
 test_expect_success 'nonexistent commit' "
 	git submodule summary >actual &&
 	cat >expected <<-EOF &&
-* sm1 $head4...$head6:
-  Warn: sm1 doesn't contain commit $head4_full
+	* sm1 $head4...$head6:
+	  Warn: sm1 doesn't contain commit $head4_full
 
-EOF
-	test_i18ncmp actual expected
+	EOF
+	test_cmp expected actual
 "
 
 commit_file
 test_expect_success 'typechanged submodule(blob->submodule)' "
 	git submodule summary >actual &&
 	cat >expected <<-EOF &&
-* sm1 $head5(blob)->$head6(submodule) (2):
-  > Add foo7
+	* sm1 $head5(blob)->$head6(submodule) (2):
+	  > Add foo7
 
-EOF
-	test_i18ncmp expected actual
+	EOF
+	test_cmp expected actual
 "
 
 commit_file sm1 &&
@@ -234,9 +244,9 @@ rm -rf sm1
 test_expect_success 'deleted submodule' "
 	git submodule summary >actual &&
 	cat >expected <<-EOF &&
-* sm1 $head6...0000000:
+	* sm1 $head6...0000000:
 
-EOF
+	EOF
 	test_cmp expected actual
 "
 
@@ -249,22 +259,22 @@ test_expect_success 'create second submodule' '
 test_expect_success 'multiple submodules' "
 	git submodule summary >actual &&
 	cat >expected <<-EOF &&
-* sm1 $head6...0000000:
+	* sm1 $head6...0000000:
 
-* sm2 0000000...$head7 (2):
-  > Add foo9
+	* sm2 0000000...$head7 (2):
+	  > Add foo9
 
-EOF
+	EOF
 	test_cmp expected actual
 "
 
 test_expect_success 'path filter' "
 	git submodule summary sm2 >actual &&
 	cat >expected <<-EOF &&
-* sm2 0000000...$head7 (2):
-  > Add foo9
+	* sm2 0000000...$head7 (2):
+	  > Add foo9
 
-EOF
+	EOF
 	test_cmp expected actual
 "
 
@@ -272,24 +282,24 @@ commit_file sm2
 test_expect_success 'given commit' "
 	git submodule summary HEAD^ >actual &&
 	cat >expected <<-EOF &&
-* sm1 $head6...0000000:
+	* sm1 $head6...0000000:
 
-* sm2 0000000...$head7 (2):
-  > Add foo9
+	* sm2 0000000...$head7 (2):
+	  > Add foo9
 
-EOF
+	EOF
 	test_cmp expected actual
 "
 
 test_expect_success '--for-status' "
 	git submodule summary --for-status HEAD^ >actual &&
-	test_i18ncmp actual - <<EOF
-* sm1 $head6...0000000:
+	test_cmp - actual <<-EOF
+	* sm1 $head6...0000000:
 
-* sm2 0000000...$head7 (2):
-  > Add foo9
+	* sm2 0000000...$head7 (2):
+	  > Add foo9
 
-EOF
+	EOF
 "
 
 test_expect_success 'fail when using --files together with --cached' "
diff --git a/t/t7402-submodule-rebase.sh b/t/t7402-submodule-rebase.sh
index 8e32f19..aa2fdc3 100755
--- a/t/t7402-submodule-rebase.sh
+++ b/t/t7402-submodule-rebase.sh
@@ -5,6 +5,7 @@
 
 test_description='Test rebasing, stashing, etc. with submodules'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
@@ -55,12 +56,15 @@ chmod a+x fake-editor.sh
 
 test_expect_success 'interactive rebase with a dirty submodule' '
 
-	test submodule = $(git diff --name-only) &&
+	echo submodule >expect &&
+	git diff --name-only >actual &&
+	test_cmp expect actual &&
 	HEAD=$(git rev-parse HEAD) &&
 	GIT_EDITOR="\"$(pwd)/fake-editor.sh\"" EDITOR_TEXT="pick $HEAD" \
 		git rebase -i HEAD^ &&
-	test submodule = $(git diff --name-only)
-
+	echo submodule >expect &&
+	git diff --name-only >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success 'rebase with dirty file and submodule fails' '
@@ -82,11 +86,19 @@ test_expect_success 'stash with a dirty submodule' '
 	CURRENT=$(cd submodule && git rev-parse HEAD) &&
 	git stash &&
 	test new != $(cat file) &&
-	test submodule = $(git diff --name-only) &&
-	test $CURRENT = $(cd submodule && git rev-parse HEAD) &&
+	echo submodule >expect &&
+	git diff --name-only >actual &&
+	test_cmp expect actual &&
+
+	echo "$CURRENT" >expect &&
+	git -C submodule rev-parse HEAD >actual &&
+	test_cmp expect actual &&
+
 	git stash apply &&
 	test new = $(cat file) &&
-	test $CURRENT = $(cd submodule && git rev-parse HEAD)
+	echo "$CURRENT" >expect &&
+	git -C submodule rev-parse HEAD >actual &&
+	test_cmp expect actual
 
 '
 
@@ -104,7 +116,7 @@ test_expect_success 'rebasing submodule that should conflict' '
 	test_tick &&
 	git commit -m fourth &&
 
-	test_must_fail git rebase --onto HEAD^^ HEAD^ HEAD^0 &&
+	test_must_fail git rebase --onto HEAD^^ HEAD^ HEAD^0 2>actual_output &&
 	git ls-files -s submodule >actual &&
 	(
 		cd submodule &&
@@ -112,7 +124,12 @@ test_expect_success 'rebasing submodule that should conflict' '
 		echo "160000 $(git rev-parse HEAD^^) 2	submodule" &&
 		echo "160000 $(git rev-parse HEAD) 3	submodule"
 	) >expect &&
-	test_cmp expect actual
+	test_cmp expect actual &&
+	if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+    then
+		sub_expect="go to submodule (submodule), and either merge commit $(git -C submodule rev-parse --short HEAD^0)" &&
+		grep "$sub_expect" actual_output
+	fi
 '
 
 test_done
diff --git a/t/t7403-submodule-sync.sh b/t/t7403-submodule-sync.sh
index 0726799..19b6135 100755
--- a/t/t7403-submodule-sync.sh
+++ b/t/t7403-submodule-sync.sh
@@ -8,9 +8,15 @@ test_description='git submodule sync
 These tests exercise the "git submodule sync" subcommand.
 '
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
+	git config --global protocol.file.allow always &&
+
 	echo file >file &&
 	git add file &&
 	test_tick &&
@@ -78,7 +84,7 @@ test_expect_success 'change submodule url' '
 	(
 		cd super &&
 		cd submodule &&
-		git checkout master &&
+		git checkout main &&
 		git pull
 	) &&
 	mv submodule moved-submodule &&
@@ -112,7 +118,7 @@ test_expect_success '"git submodule sync" should update submodule URLs' '
 	)" &&
 	(
 		cd super-clone/submodule &&
-		git checkout master &&
+		git checkout main &&
 		git pull
 	) &&
 	(
@@ -140,7 +146,7 @@ test_expect_success '"git submodule sync --recursive" should update all submodul
 	)" &&
 	(
 		cd super-clone/submodule/sub-submodule &&
-		git checkout master &&
+		git checkout main &&
 		git pull
 	)
 '
@@ -157,7 +163,7 @@ test_expect_success '"git submodule sync" should update submodule URLs - subdire
 		cd sub &&
 		git submodule sync >../../output
 	) &&
-	test_i18ngrep "\\.\\./submodule" output &&
+	test_grep "\\.\\./submodule" output &&
 	test -d "$(
 		cd super-clone/submodule &&
 		git config remote.origin.url
@@ -168,7 +174,7 @@ test_expect_success '"git submodule sync" should update submodule URLs - subdire
 	)" &&
 	(
 		cd super-clone/submodule &&
-		git checkout master &&
+		git checkout main &&
 		git pull
 	) &&
 	(
@@ -188,7 +194,7 @@ test_expect_success '"git submodule sync --recursive" should update all submodul
 		cd sub &&
 		git submodule sync --recursive >../../output
 	) &&
-	test_i18ngrep "\\.\\./submodule/sub-submodule" output &&
+	test_grep "\\.\\./submodule/sub-submodule" output &&
 	test -d "$(
 		cd super-clone/submodule &&
 		git config remote.origin.url
@@ -199,7 +205,7 @@ test_expect_success '"git submodule sync --recursive" should update all submodul
 	)" &&
 	(
 		cd super-clone/submodule/sub-submodule &&
-		git checkout master &&
+		git checkout main &&
 		git pull
 	)
 '
diff --git a/t/t7406-submodule-update.sh b/t/t7406-submodule-update.sh
index aa19ff3..8491b8c 100755
--- a/t/t7406-submodule-update.sh
+++ b/t/t7406-submodule-update.sh
@@ -9,19 +9,23 @@ This test verifies that "git submodule update" detaches the HEAD of the
 submodule and "git submodule update --rebase/--merge" does not detach the HEAD.
 '
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 
 compare_head()
 {
-    sha_master=$(git rev-list --max-count=1 master)
+    sha_main=$(git rev-list --max-count=1 main)
     sha_head=$(git rev-list --max-count=1 HEAD)
 
-    test "$sha_master" = "$sha_head"
+    test "$sha_main" = "$sha_head"
 }
 
 
 test_expect_success 'setup a submodule tree' '
+	git config --global protocol.file.allow always &&
 	echo file > file &&
 	git add file &&
 	test_tick &&
@@ -152,9 +156,9 @@ test_expect_success 'submodule update --init --recursive from subdirectory' '
 	 cd tmp &&
 	 git submodule update --init --recursive ../super >../../actual 2>../../actual2
 	) &&
-	test_i18ncmp expect actual &&
+	test_cmp expect actual &&
 	sort actual2 >actual2.sorted &&
-	test_i18ncmp expect2 actual2.sorted
+	test_cmp expect2 actual2.sorted
 '
 
 cat <<EOF >expect2
@@ -171,7 +175,7 @@ test_expect_success 'submodule update --init from and of subdirectory' '
 	  git submodule update --init sub 2>../../actual2
 	 )
 	) &&
-	test_i18ncmp expect2 actual2
+	test_cmp expect2 actual2
 '
 
 test_expect_success 'submodule update does not fetch already present commits' '
@@ -189,7 +193,7 @@ test_expect_success 'submodule update does not fetch already present commits' '
 	(cd super &&
 	  git submodule update > ../actual 2> ../actual.err
 	) &&
-	test_i18ncmp expected actual &&
+	test_cmp expected actual &&
 	test_must_be_empty actual.err
 '
 
@@ -202,8 +206,18 @@ test_expect_success 'submodule update should fail due to local changes' '
 	 (cd submodule &&
 	  compare_head
 	 ) &&
-	 test_must_fail git submodule update submodule
-	)
+	 test_must_fail git submodule update submodule 2>../actual.raw
+	) &&
+	sed "s/^> //" >expect <<-\EOF &&
+	> error: Your local changes to the following files would be overwritten by checkout:
+	> 	file
+	> Please commit your changes or stash them before you switch branches.
+	> Aborting
+	> fatal: Unable to checkout OID in submodule path '\''submodule'\''
+	EOF
+	sed -e "s/checkout $SQ[^$SQ]*$SQ/checkout OID/" <actual.raw >actual &&
+	test_cmp expect actual
+
 '
 test_expect_success 'submodule update should throw away changes with --force ' '
 	(cd super &&
@@ -262,14 +276,14 @@ test_expect_success 'submodule update --remote should fetch upstream changes wit
 		cd super &&
 		git submodule update --remote --force submodule &&
 		git -C submodule log -1 --oneline >actual &&
-		git -C ../submodule log -1 --oneline master >expect &&
+		git -C ../submodule log -1 --oneline main >expect &&
 		test_cmp expect actual &&
 		git checkout -b test-branch &&
 		git submodule update --remote --force submodule &&
 		git -C submodule log -1 --oneline >actual &&
 		git -C ../submodule log -1 --oneline test-branch >expect &&
 		test_cmp expect actual &&
-		git checkout master &&
+		git checkout main &&
 		git branch -d test-branch &&
 		git reset --hard HEAD^
 	)
@@ -282,7 +296,7 @@ test_expect_success 'local config should override .gitmodules branch' '
 	 git add file &&
 	 test_tick &&
 	 git commit -m "upstream line5" &&
-	 git checkout master
+	 git checkout main
 	) &&
 	(cd super &&
 	 git config submodule.submodule.branch test-branch &&
@@ -292,9 +306,9 @@ test_expect_success 'local config should override .gitmodules branch' '
 	)
 '
 
-test_expect_success 'submodule update --rebase staying on master' '
+test_expect_success 'submodule update --rebase staying on main' '
 	(cd super/submodule &&
-	  git checkout master
+	  git checkout main
 	) &&
 	(cd super &&
 	 (cd submodule &&
@@ -306,7 +320,7 @@ test_expect_success 'submodule update --rebase staying on master' '
 	)
 '
 
-test_expect_success 'submodule update --merge staying on master' '
+test_expect_success 'submodule update --merge staying on main' '
 	(cd super/submodule &&
 	  git reset --hard HEAD~1
 	) &&
@@ -445,7 +459,7 @@ test_expect_success 'fsck detects command in .gitmodules' '
 '
 
 cat << EOF >expect
-Execution of 'false $submodulesha1' failed in submodule path 'submodule'
+fatal: Execution of 'false $submodulesha1' failed in submodule path 'submodule'
 EOF
 
 test_expect_success 'submodule update - command in .git/config catches failure' '
@@ -458,11 +472,11 @@ test_expect_success 'submodule update - command in .git/config catches failure'
 	(cd super &&
 	 test_must_fail git submodule update submodule 2>../actual
 	) &&
-	test_i18ncmp actual expect
+	test_cmp actual expect
 '
 
 cat << EOF >expect
-Execution of 'false $submodulesha1' failed in submodule path '../submodule'
+fatal: Execution of 'false $submodulesha1' failed in submodule path '../submodule'
 EOF
 
 test_expect_success 'submodule update - command in .git/config catches failure -- subdirectory' '
@@ -476,22 +490,22 @@ test_expect_success 'submodule update - command in .git/config catches failure -
 	 mkdir tmp && cd tmp &&
 	 test_must_fail git submodule update ../submodule 2>../../actual
 	) &&
-	test_i18ncmp actual expect
+	test_cmp actual expect
 '
 
 test_expect_success 'submodule update - command run for initial population of submodule' '
 	cat >expect <<-EOF &&
-	Execution of '\''false $submodulesha1'\'' failed in submodule path '\''submodule'\''
+	fatal: Execution of '\''false $submodulesha1'\'' failed in submodule path '\''submodule'\''
 	EOF
 	rm -rf super/submodule &&
 	test_must_fail git -C super submodule update 2>actual &&
-	test_i18ncmp expect actual &&
+	test_cmp expect actual &&
 	git -C super submodule update --checkout
 '
 
 cat << EOF >expect
-Execution of 'false $submodulesha1' failed in submodule path '../super/submodule'
-Failed to recurse into submodule path '../super'
+fatal: Execution of 'false $submodulesha1' failed in submodule path '../super/submodule'
+fatal: Failed to recurse into submodule path '../super'
 EOF
 
 test_expect_success 'recursive submodule update - command in .git/config catches failure -- subdirectory' '
@@ -506,7 +520,7 @@ test_expect_success 'recursive submodule update - command in .git/config catches
 	 mkdir -p tmp && cd tmp &&
 	 test_must_fail git submodule update --recursive ../super 2>../../actual
 	) &&
-	test_i18ncmp actual expect
+	test_cmp actual expect
 '
 
 test_expect_success 'submodule init does not copy command into .git/config' '
@@ -609,7 +623,7 @@ test_expect_success 'submodule update - update=none in .git/config' '
 	(cd super &&
 	 git config submodule.submodule.update none &&
 	 (cd submodule &&
-	  git checkout master &&
+	  git checkout main &&
 	  compare_head
 	 ) &&
 	 git diff --name-only >out &&
@@ -629,7 +643,7 @@ test_expect_success 'submodule update - update=none in .git/config but --checkou
 	(cd super &&
 	 git config submodule.submodule.update none &&
 	 (cd submodule &&
-	  git checkout master &&
+	  git checkout main &&
 	  compare_head
 	 ) &&
 	 git diff --name-only >out &&
@@ -657,6 +671,39 @@ test_expect_success 'submodule update --init skips submodule with update=none' '
 	)
 '
 
+test_expect_success 'submodule update with pathspec warns against uninitialized ones' '
+	test_when_finished "rm -fr selective" &&
+	git clone super selective &&
+	(
+		cd selective &&
+		git submodule init submodule &&
+
+		git submodule update submodule 2>err &&
+		! grep "Submodule path .* not initialized" err &&
+
+		git submodule update rebasing 2>err &&
+		grep "Submodule path .rebasing. not initialized" err &&
+
+		test_path_exists submodule/.git &&
+		test_path_is_missing rebasing/.git
+	)
+
+'
+
+test_expect_success 'submodule update without pathspec updates only initialized ones' '
+	test_when_finished "rm -fr selective" &&
+	git clone super selective &&
+	(
+		cd selective &&
+		git submodule init submodule &&
+		git submodule update 2>err &&
+		test_path_exists submodule/.git &&
+		test_path_is_missing rebasing/.git &&
+		! grep "Submodule path .* not initialized" err
+	)
+
+'
+
 test_expect_success 'submodule update continues after checkout error' '
 	(cd super &&
 	 git reset --hard HEAD &&
@@ -689,7 +736,7 @@ test_expect_success 'submodule update continues after checkout error' '
 test_expect_success 'submodule update continues after recursive checkout error' '
 	(cd super &&
 	 git reset --hard HEAD &&
-	 git checkout master &&
+	 git checkout main &&
 	 git submodule update &&
 	 (cd submodule &&
 	  git submodule add ../submodule subsubmodule &&
@@ -723,7 +770,7 @@ test_expect_success 'submodule update continues after recursive checkout error'
 	   echo "" > file
 	  )
 	 ) &&
-	 test_must_fail git submodule update --recursive &&
+	 test_expect_code 1 git submodule update --recursive &&
 	 (cd submodule2 &&
 	  git rev-parse --verify HEAD >../actual
 	 ) &&
@@ -733,7 +780,7 @@ test_expect_success 'submodule update continues after recursive checkout error'
 
 test_expect_success 'submodule update exit immediately in case of merge conflict' '
 	(cd super &&
-	 git checkout master &&
+	 git checkout main &&
 	 git reset --hard HEAD &&
 	 (cd submodule &&
 	  (cd subsubmodule &&
@@ -751,7 +798,7 @@ test_expect_success 'submodule update exit immediately in case of merge conflict
 	 git add submodule2 &&
 	 git commit -m "two_new_submodule_commits" &&
 	 (cd submodule &&
-	  git checkout master &&
+	  git checkout main &&
 	  test_commit "conflict" file &&
 	  echo "conflict" > file
 	 ) &&
@@ -770,7 +817,7 @@ test_expect_success 'submodule update exit immediately in case of merge conflict
 
 test_expect_success 'submodule update exit immediately after recursive rebase error' '
 	(cd super &&
-	 git checkout master &&
+	 git checkout main &&
 	 git reset --hard HEAD &&
 	 (cd submodule &&
 	  git reset --hard HEAD &&
@@ -786,7 +833,7 @@ test_expect_success 'submodule update exit immediately after recursive rebase er
 	 git add submodule2 &&
 	 git commit -m "two_new_submodule_commits" &&
 	 (cd submodule &&
-	  git checkout master &&
+	  git checkout main &&
 	  test_commit "conflict2" file &&
 	  echo "conflict" > file
 	 ) &&
@@ -878,27 +925,27 @@ test_expect_success 'submodule update places git-dir in superprojects git-dir re
 	git clone subsubsuper_update_r subsubsuper_update_r2 &&
 	(cd subsubsuper_update_r2 &&
 	 test_commit "update_subsubsuper" file &&
-	 git push origin master
+	 git push origin main
 	) &&
 	git clone subsuper_update_r subsuper_update_r2 &&
 	(cd subsuper_update_r2 &&
 	 test_commit "update_subsuper" file &&
 	 git submodule add ../subsubsuper_update_r subsubmodule &&
 	 git commit -am "subsubmodule" &&
-	 git push origin master
+	 git push origin main
 	) &&
 	git clone super_update_r super_update_r2 &&
 	(cd super_update_r2 &&
 	 test_commit "update_super" file &&
 	 git submodule add ../subsuper_update_r submodule &&
 	 git commit -am "submodule" &&
-	 git push origin master
+	 git push origin main
 	) &&
 	rm -rf super_update_r2 &&
 	git clone super_update_r super_update_r2 &&
 	(cd super_update_r2 &&
 	 git submodule update --init --recursive >actual &&
-	 test_i18ngrep "Submodule path .submodule/subsubmodule.: checked out" actual &&
+	 test_grep "Submodule path .submodule/subsubmodule.: checked out" actual &&
 	 (cd submodule/subsubmodule &&
 	  git log > ../../expected
 	 ) &&
@@ -911,7 +958,7 @@ test_expect_success 'submodule update places git-dir in superprojects git-dir re
 
 test_expect_success 'submodule add properly re-creates deeper level submodules' '
 	(cd super &&
-	 git reset --hard master &&
+	 git reset --hard main &&
 	 rm -rf deeper/ &&
 	 git submodule add --force ../submodule deeper/submodule
 	)
@@ -978,7 +1025,7 @@ test_expect_success 'submodule update clone shallow submodule outside of depth'
 		# unadvertised objects, so restrict this test to v0.
 		test_must_fail env GIT_TEST_PROTOCOL_VERSION=0 \
 			git submodule update --init --depth=1 2>actual &&
-		test_i18ngrep "Direct fetching of that commit failed." actual &&
+		test_grep "Direct fetching of that commit failed." actual &&
 		git -C ../submodule config uploadpack.allowReachableSHA1InWant true &&
 		git submodule update --init --depth=1 >actual &&
 		git -C submodule log --oneline >out &&
@@ -992,7 +1039,7 @@ test_expect_success 'submodule update --recursive drops module name before recur
 	  git checkout HEAD^
 	 ) &&
 	 git submodule update --recursive deeper/submodule >actual &&
-	 test_i18ngrep "Submodule path .deeper/submodule/subsubmodule.: checked out" actual
+	 test_grep "Submodule path .deeper/submodule/subsubmodule.: checked out" actual
 	)
 '
 
@@ -1022,4 +1069,137 @@ test_expect_success 'git clone passes the parallel jobs config on to submodules'
 	rm -rf super4
 '
 
+test_expect_success 'submodule update --quiet passes quietness to merge/rebase' '
+	(cd super &&
+	 test_commit -C rebasing message &&
+	 git submodule update --rebase --quiet >out 2>err &&
+	 test_must_be_empty out &&
+	 test_must_be_empty err &&
+	 git submodule update --rebase >out 2>err &&
+	 test_file_not_empty out &&
+	 test_must_be_empty err
+	)
+'
+
+test_expect_success 'submodule update --quiet passes quietness to fetch with a shallow clone' '
+	test_when_finished "rm -rf super4 super5 super6" &&
+	git clone . super4 &&
+	(cd super4 &&
+	 git submodule add --quiet file://"$TRASH_DIRECTORY"/submodule submodule3 &&
+	 git commit -am "setup submodule3"
+	) &&
+	(cd submodule &&
+	  test_commit line6 file
+	) &&
+	git clone super4 super5 &&
+	(cd super5 &&
+	 git submodule update --quiet --init --depth=1 submodule3 >out 2>err &&
+	 test_must_be_empty out &&
+	 test_must_be_empty err
+	) &&
+	git clone super4 super6 &&
+	(cd super6 &&
+	 git submodule update --init --depth=1 submodule3 >out 2>err &&
+	 test_file_not_empty out &&
+	 test_file_not_empty err
+	)
+'
+
+test_expect_success 'submodule update --filter requires --init' '
+	test_expect_code 129 git -C super submodule update --filter blob:none
+'
+
+test_expect_success 'submodule update --filter sets partial clone settings' '
+	test_when_finished "rm -rf super-filter" &&
+	git clone cloned super-filter &&
+	git -C super-filter submodule update --init --filter blob:none &&
+	test_cmp_config -C super-filter/submodule true remote.origin.promisor &&
+	test_cmp_config -C super-filter/submodule blob:none remote.origin.partialclonefilter
+'
+
+# NEEDSWORK: Clean up the tests so that we can reuse the test setup.
+# Don't reuse the existing repos because the earlier tests have
+# intentionally disruptive configurations.
+test_expect_success 'setup clean recursive superproject' '
+	git init bottom &&
+	test_commit -C bottom "bottom" &&
+	git init middle &&
+	git -C middle submodule add ../bottom bottom &&
+	git -C middle commit -m "middle" &&
+	git init top &&
+	git -C top submodule add ../middle middle &&
+	git -C top commit -m "top" &&
+	git clone --recurse-submodules top top-clean
+'
+
+test_expect_success 'submodule update should skip unmerged submodules' '
+	test_when_finished "rm -fr top-cloned" &&
+	cp -r top-clean top-cloned &&
+
+	# Create an upstream commit in each repo, starting with bottom
+	test_commit -C bottom upstream_commit &&
+	# Create middle commit
+	git -C middle/bottom fetch &&
+	git -C middle/bottom checkout -f FETCH_HEAD &&
+	git -C middle add bottom &&
+	git -C middle commit -m "upstream_commit" &&
+	# Create top commit
+	git -C top/middle fetch &&
+	git -C top/middle checkout -f FETCH_HEAD &&
+	git -C top add middle &&
+	git -C top commit -m "upstream_commit" &&
+
+	# Create a downstream conflict
+	test_commit -C top-cloned/middle/bottom downstream_commit &&
+	git -C top-cloned/middle add bottom &&
+	git -C top-cloned/middle commit -m "downstream_commit" &&
+	git -C top-cloned/middle fetch --recurse-submodules origin &&
+	test_must_fail git -C top-cloned/middle merge origin/main &&
+
+	# Make the update of "middle" a no-op, otherwise we error out
+	# because of its unmerged state
+	test_config -C top-cloned submodule.middle.update !true &&
+	git -C top-cloned submodule update --recursive 2>actual.err &&
+	cat >expect.err <<-\EOF &&
+	Skipping unmerged submodule middle/bottom
+	EOF
+	test_cmp expect.err actual.err
+'
+
+test_expect_success 'submodule update --recursive skip submodules with strategy=none' '
+	test_when_finished "rm -fr top-cloned" &&
+	cp -r top-clean top-cloned &&
+
+	test_commit -C top-cloned/middle/bottom downstream_commit &&
+	git -C top-cloned/middle config submodule.bottom.update none &&
+	git -C top-cloned submodule update --recursive 2>actual.err &&
+	cat >expect.err <<-\EOF &&
+	Skipping submodule '\''middle/bottom'\''
+	EOF
+	test_cmp expect.err actual.err
+'
+
+add_submodule_commit_and_validate () {
+	HASH=$(git rev-parse HEAD) &&
+	git update-index --add --cacheinfo 160000,$HASH,sub &&
+	git commit -m "create submodule" &&
+	echo "160000 commit $HASH	sub" >expect &&
+	git ls-tree HEAD -- sub >actual &&
+	test_cmp expect actual
+}
+
+test_expect_success 'commit with staged submodule change' '
+	add_submodule_commit_and_validate
+'
+
+test_expect_success 'commit with staged submodule change with ignoreSubmodules dirty' '
+	test_config diff.ignoreSubmodules dirty &&
+	add_submodule_commit_and_validate
+'
+
+test_expect_success 'commit with staged submodule change with ignoreSubmodules all' '
+	test_config diff.ignoreSubmodules all &&
+	add_submodule_commit_and_validate
+'
+
 test_done
diff --git a/t/t7407-submodule-foreach.sh b/t/t7407-submodule-foreach.sh
index 6b2aa91..8d7b234 100755
--- a/t/t7407-submodule-foreach.sh
+++ b/t/t7407-submodule-foreach.sh
@@ -9,10 +9,14 @@ This test verifies that "git submodule foreach" correctly visits all submodules
 that are currently checked out.
 '
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 
 test_expect_success 'setup a submodule tree' '
+	git config --global protocol.file.allow always &&
 	echo file > file &&
 	git add file &&
 	test_tick &&
@@ -77,7 +81,7 @@ test_expect_success 'test basic "submodule foreach" usage' '
 		git config foo.bar zar &&
 		git submodule foreach "git config --file \"\$toplevel/.git/config\" foo.bar"
 	) &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 cat >expect <<EOF
@@ -93,7 +97,7 @@ test_expect_success 'test "submodule foreach" from subdirectory' '
 		cd clone/sub &&
 		git submodule foreach "echo \$toplevel-\$name-\$sm_path-\$displaypath-\$sha1" >../../actual
 	) &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 test_expect_success 'setup nested submodules' '
@@ -150,6 +154,11 @@ test_expect_success 'use "submodule foreach" to checkout 2nd level submodule' '
 	)
 '
 
+test_expect_success 'usage: foreach -- --not-an-option' '
+	test_expect_code 1 git submodule foreach -- --not-an-option &&
+	test_expect_code 1 git -C clone2 submodule foreach -- --not-an-option
+'
+
 test_expect_success 'use "foreach --recursive" to checkout all submodules' '
 	(
 		cd clone2 &&
@@ -174,7 +183,7 @@ test_expect_success 'test messages from "foreach --recursive"' '
 		cd clone2 &&
 		git submodule foreach --recursive "true" > ../actual
 	) &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 cat > expect <<EOF
@@ -194,7 +203,7 @@ test_expect_success 'test messages from "foreach --recursive" from subdirectory'
 		cd untracked &&
 		git submodule foreach --recursive >../../actual
 	) &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 sub1sha1=$(cd clone2/sub1 && git rev-parse HEAD)
 sub2sha1=$(cd clone2/sub2 && git rev-parse HEAD)
@@ -226,7 +235,7 @@ test_expect_success 'test "submodule foreach --recursive" from subdirectory' '
 		cd clone2/untracked &&
 		git submodule foreach --recursive "echo toplevel: \$toplevel name: \$name path: \$sm_path displaypath: \$displaypath hash: \$sha1" >../../actual
 	) &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 cat > expect <<EOF
@@ -277,13 +286,13 @@ sub1sha1_short=$(cd clone3/sub1 && git rev-parse --short HEAD)
 sub2sha1_short=$(cd clone3/sub2 && git rev-parse --short HEAD)
 
 cat > expect <<EOF
- $nested1sha1 nested1 (heads/master)
- $nested2sha1 nested1/nested2 (heads/master)
- $nested3sha1 nested1/nested2/nested3 (heads/master)
- $submodulesha1 nested1/nested2/nested3/submodule (heads/master)
+ $nested1sha1 nested1 (heads/main)
+ $nested2sha1 nested1/nested2 (heads/main)
+ $nested3sha1 nested1/nested2/nested3 (heads/main)
+ $submodulesha1 nested1/nested2/nested3/submodule (heads/main)
  $sub1sha1 sub1 ($sub1sha1_short)
  $sub2sha1 sub2 ($sub2sha1_short)
- $sub3sha1 sub3 (heads/master)
+ $sub3sha1 sub3 (heads/main)
 EOF
 
 test_expect_success 'test "status --recursive"' '
@@ -295,10 +304,10 @@ test_expect_success 'test "status --recursive"' '
 '
 
 cat > expect <<EOF
- $nested1sha1 nested1 (heads/master)
+ $nested1sha1 nested1 (heads/main)
 +$nested2sha1 nested1/nested2 (file2~1)
- $nested3sha1 nested1/nested2/nested3 (heads/master)
- $submodulesha1 nested1/nested2/nested3/submodule (heads/master)
+ $nested3sha1 nested1/nested2/nested3 (heads/main)
+ $submodulesha1 nested1/nested2/nested3/submodule (heads/main)
 EOF
 
 test_expect_success 'ensure "status --cached --recursive" preserves the --cached flag' '
@@ -316,13 +325,13 @@ test_expect_success 'ensure "status --cached --recursive" preserves the --cached
 nested2sha1=$(git -C clone3/nested1/nested2 rev-parse HEAD)
 
 cat > expect <<EOF
- $nested1sha1 ../nested1 (heads/master)
+ $nested1sha1 ../nested1 (heads/main)
 +$nested2sha1 ../nested1/nested2 (file2)
- $nested3sha1 ../nested1/nested2/nested3 (heads/master)
- $submodulesha1 ../nested1/nested2/nested3/submodule (heads/master)
+ $nested3sha1 ../nested1/nested2/nested3 (heads/main)
+ $submodulesha1 ../nested1/nested2/nested3/submodule (heads/main)
  $sub1sha1 ../sub1 ($sub1sha1_short)
  $sub2sha1 ../sub2 ($sub2sha1_short)
- $sub3sha1 ../sub3 (heads/master)
+ $sub3sha1 ../sub3 (heads/main)
 EOF
 
 test_expect_success 'test "status --recursive" from sub directory' '
diff --git a/t/t7408-submodule-reference.sh b/t/t7408-submodule-reference.sh
index a3892f4..d6040e0 100755
--- a/t/t7408-submodule-reference.sh
+++ b/t/t7408-submodule-reference.sh
@@ -17,6 +17,10 @@ test_alternate_is_used () {
 	test_cmp expect actual
 }
 
+test_expect_success 'setup' '
+	git config --global protocol.file.allow always
+'
+
 test_expect_success 'preparing first repository' '
 	test_create_repo A &&
 	(
@@ -193,7 +197,19 @@ test_expect_success 'missing nested submodule alternate fails clone and submodul
 		cd supersuper-clone &&
 		check_that_two_of_three_alternates_are_used &&
 		# update of the submodule fails
-		test_must_fail git submodule update --init --recursive
+		cat >expect <<-\EOF &&
+		fatal: submodule '\''sub'\'' cannot add alternate: path ... does not exist
+		Failed to clone '\''sub'\''. Retry scheduled
+		fatal: submodule '\''sub-dissociate'\'' cannot add alternate: path ... does not exist
+		Failed to clone '\''sub-dissociate'\''. Retry scheduled
+		fatal: submodule '\''sub'\'' cannot add alternate: path ... does not exist
+		Failed to clone '\''sub'\'' a second time, aborting
+		fatal: Failed to recurse into submodule path ...
+		EOF
+		test_must_fail git submodule update --init --recursive 2>err &&
+		grep -e fatal: -e ^Failed err >actual.raw &&
+		sed -e "s/path $SQ[^$SQ]*$SQ/path .../" <actual.raw >actual &&
+		test_cmp expect actual
 	)
 '
 
diff --git a/t/t7409-submodule-detached-work-tree.sh b/t/t7409-submodule-detached-work-tree.sh
index fc018e3..574a6fc 100755
--- a/t/t7409-submodule-detached-work-tree.sh
+++ b/t/t7409-submodule-detached-work-tree.sh
@@ -10,8 +10,16 @@ on detached working trees
 '
 
 TEST_NO_CREATE_REPO=1
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
+test_expect_success 'setup' '
+	git config --global protocol.file.allow always
+'
+
 test_expect_success 'submodule on detached working tree' '
 	git init --bare remote &&
 	test_create_repo bundle1 &&
@@ -35,7 +43,7 @@ test_expect_success 'submodule on detached working tree' '
 			git rev-parse --verify HEAD >actual &&
 			test_cmp ../../../../expect actual
 		) &&
-		git push origin master
+		git push origin main
 	) &&
 	mkdir home2 &&
 	(
@@ -44,7 +52,7 @@ test_expect_success 'submodule on detached working tree' '
 		GIT_WORK_TREE="$(pwd)" &&
 		GIT_DIR="$(pwd)/.dotfiles" &&
 		export GIT_WORK_TREE GIT_DIR &&
-		git checkout master &&
+		git checkout main &&
 		git submodule update --init &&
 		(
 			unset GIT_WORK_TREE GIT_DIR &&
@@ -64,10 +72,10 @@ test_expect_success 'submodule on detached working pointed by core.worktree' '
 		git clone --bare ../remote "$GIT_DIR" &&
 		git config core.bare false &&
 		git config core.worktree .. &&
-		git checkout master &&
+		git checkout main &&
 		git submodule add ../bundle1 .vim/bundle/dupe &&
 		test_commit "dupe" &&
-		git push origin master
+		git push origin main
 	) &&
 	(
 		cd home &&
diff --git a/t/t7411-submodule-config.sh b/t/t7411-submodule-config.sh
index ad28e93..31271f8 100755
--- a/t/t7411-submodule-config.sh
+++ b/t/t7411-submodule-config.sh
@@ -12,6 +12,9 @@ from the database and from the worktree works.
 TEST_NO_CREATE_REPO=1
 . ./test-lib.sh
 
+test_expect_success 'setup' '
+	git config --global protocol.file.allow always
+'
 test_expect_success 'submodule config cache setup' '
 	mkdir submodule &&
 	(cd submodule &&
@@ -42,7 +45,7 @@ test_expect_success 'configuration parsing with error' '
 	(
 		cd repo &&
 		test_must_fail test-tool submodule-config "" s 2>actual &&
-		test_i18ngrep "bad config" actual
+		test_grep "bad config" actual
 	)
 '
 
@@ -98,7 +101,7 @@ test_expect_success 'error in history of one submodule config lets continue, std
 				>actual \
 				2>actual_stderr &&
 		test_cmp expect_error actual &&
-		test_i18ngrep "submodule-blob $sha1:.gitmodules" actual_stderr >/dev/null
+		test_grep "submodule-blob $sha1:.gitmodules" actual_stderr >/dev/null
 	)
 '
 
@@ -134,44 +137,44 @@ test_expect_success 'error in history in fetchrecursesubmodule lets continue' '
 	)
 '
 
-test_expect_success 'reading submodules config from the working tree with "submodule--helper config"' '
+test_expect_success 'reading submodules config from the working tree' '
 	(cd super &&
 		echo "../submodule" >expect &&
-		git submodule--helper config submodule.submodule.url >actual &&
+		test-tool submodule config-list submodule.submodule.url >actual &&
 		test_cmp expect actual
 	)
 '
 
-test_expect_success 'unsetting submodules config from the working tree with "submodule--helper config --unset"' '
+test_expect_success 'unsetting submodules config from the working tree' '
 	(cd super &&
-		git submodule--helper config --unset submodule.submodule.url &&
-		git submodule--helper config submodule.submodule.url >actual &&
+		test-tool submodule config-unset submodule.submodule.url &&
+		test-tool submodule config-list submodule.submodule.url >actual &&
 		test_must_be_empty actual
 	)
 '
 
 
-test_expect_success 'writing submodules config with "submodule--helper config"' '
+test_expect_success 'writing submodules config' '
 	(cd super &&
 		echo "new_url" >expect &&
-		git submodule--helper config submodule.submodule.url "new_url" &&
-		git submodule--helper config submodule.submodule.url >actual &&
+		test-tool submodule config-set submodule.submodule.url "new_url" &&
+		test-tool submodule config-list submodule.submodule.url >actual &&
 		test_cmp expect actual
 	)
 '
 
-test_expect_success 'overwriting unstaged submodules config with "submodule--helper config"' '
+test_expect_success 'overwriting unstaged submodules config' '
 	test_when_finished "git -C super checkout .gitmodules" &&
 	(cd super &&
 		echo "newer_url" >expect &&
-		git submodule--helper config submodule.submodule.url "newer_url" &&
-		git submodule--helper config submodule.submodule.url >actual &&
+		test-tool submodule config-set submodule.submodule.url "newer_url" &&
+		test-tool submodule config-list submodule.submodule.url >actual &&
 		test_cmp expect actual
 	)
 '
 
 test_expect_success 'writeable .gitmodules when it is in the working tree' '
-	git -C super submodule--helper config --check-writeable
+	test-tool -C super submodule config-writeable
 '
 
 test_expect_success 'writeable .gitmodules when it is nowhere in the repository' '
@@ -180,7 +183,7 @@ test_expect_success 'writeable .gitmodules when it is nowhere in the repository'
 	(cd super &&
 		git rm .gitmodules &&
 		git commit -m "remove .gitmodules from the current branch" &&
-		git submodule--helper config --check-writeable
+		test-tool submodule config-writeable
 	)
 '
 
@@ -188,7 +191,7 @@ test_expect_success 'non-writeable .gitmodules when it is in the index but not i
 	test_when_finished "git -C super checkout .gitmodules" &&
 	(cd super &&
 		rm -f .gitmodules &&
-		test_must_fail git submodule--helper config --check-writeable
+		test_must_fail test-tool submodule config-writeable
 	)
 '
 
@@ -197,7 +200,7 @@ test_expect_success 'non-writeable .gitmodules when it is in the current branch
 	test_when_finished "git -C super reset --hard $ORIG" &&
 	(cd super &&
 		git rm .gitmodules &&
-		test_must_fail git submodule--helper config --check-writeable
+		test_must_fail test-tool submodule config-writeable
 	)
 '
 
@@ -205,11 +208,11 @@ test_expect_success 'reading submodules config from the index when .gitmodules i
 	ORIG=$(git -C super rev-parse HEAD) &&
 	test_when_finished "git -C super reset --hard $ORIG" &&
 	(cd super &&
-		git submodule--helper config submodule.submodule.url "staged_url" &&
+		test-tool submodule config-set submodule.submodule.url "staged_url" &&
 		git add .gitmodules &&
 		rm -f .gitmodules &&
 		echo "staged_url" >expect &&
-		git submodule--helper config submodule.submodule.url >actual &&
+		test-tool submodule config-list submodule.submodule.url >actual &&
 		test_cmp expect actual
 	)
 '
@@ -220,7 +223,7 @@ test_expect_success 'reading submodules config from the current branch when .git
 	(cd super &&
 		git rm .gitmodules &&
 		echo "../submodule" >expect &&
-		git submodule--helper config submodule.submodule.url >actual &&
+		test-tool submodule config-list submodule.submodule.url >actual &&
 		test_cmp expect actual
 	)
 '
diff --git a/t/t7412-submodule-absorbgitdirs.sh b/t/t7412-submodule-absorbgitdirs.sh
index 1cfa150..f778321 100755
--- a/t/t7412-submodule-absorbgitdirs.sh
+++ b/t/t7412-submodule-absorbgitdirs.sh
@@ -6,9 +6,11 @@ This test verifies that `git submodue absorbgitdirs` moves a submodules git
 directory into the superproject.
 '
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup a real submodule' '
+	cwd="$(pwd)" &&
 	git init sub1 &&
 	test_commit -C sub1 first &&
 	git submodule add ./sub1 &&
@@ -17,13 +19,21 @@ test_expect_success 'setup a real submodule' '
 '
 
 test_expect_success 'absorb the git dir' '
+	>expect &&
+	>actual &&
 	>expect.1 &&
 	>expect.2 &&
 	>actual.1 &&
 	>actual.2 &&
 	git status >expect.1 &&
 	git -C sub1 rev-parse HEAD >expect.2 &&
-	git submodule absorbgitdirs &&
+	cat >expect <<-EOF &&
+	Migrating git directory of '\''sub1'\'' from
+	'\''$cwd/sub1/.git'\'' to
+	'\''$cwd/.git/modules/sub1'\''
+	EOF
+	git submodule absorbgitdirs 2>actual &&
+	test_cmp expect actual &&
 	git fsck &&
 	test -f sub1/.git &&
 	test -d .git/modules/sub1 &&
@@ -36,7 +46,8 @@ test_expect_success 'absorb the git dir' '
 test_expect_success 'absorbing does not fail for deinitialized submodules' '
 	test_when_finished "git submodule update --init" &&
 	git submodule deinit --all &&
-	git submodule absorbgitdirs &&
+	git submodule absorbgitdirs 2>err &&
+	test_must_be_empty err &&
 	test -d .git/modules/sub1 &&
 	test -d sub1 &&
 	! test -e sub1/.git
@@ -55,7 +66,13 @@ test_expect_success 'setup nested submodule' '
 test_expect_success 'absorb the git dir in a nested submodule' '
 	git status >expect.1 &&
 	git -C sub1/nested rev-parse HEAD >expect.2 &&
-	git submodule absorbgitdirs &&
+	cat >expect <<-EOF &&
+	Migrating git directory of '\''sub1/nested'\'' from
+	'\''$cwd/sub1/nested/.git'\'' to
+	'\''$cwd/.git/modules/sub1/modules/nested'\''
+	EOF
+	git submodule absorbgitdirs 2>actual &&
+	test_cmp expect actual &&
 	test -f sub1/nested/.git &&
 	test -d .git/modules/sub1/modules/nested &&
 	git status >actual.1 &&
@@ -86,7 +103,13 @@ test_expect_success 're-setup nested submodule' '
 test_expect_success 'absorb the git dir in a nested submodule' '
 	git status >expect.1 &&
 	git -C sub1/nested rev-parse HEAD >expect.2 &&
-	git submodule absorbgitdirs &&
+	cat >expect <<-EOF &&
+	Migrating git directory of '\''sub1'\'' from
+	'\''$cwd/sub1/.git'\'' to
+	'\''$cwd/.git/modules/sub1'\''
+	EOF
+	git submodule absorbgitdirs 2>actual &&
+	test_cmp expect actual &&
 	test -f sub1/.git &&
 	test -f sub1/nested/.git &&
 	test -d .git/modules/sub1/modules/nested &&
@@ -96,6 +119,27 @@ test_expect_success 'absorb the git dir in a nested submodule' '
 	test_cmp expect.2 actual.2
 '
 
+test_expect_success 'absorb the git dir outside of primary worktree' '
+	test_when_finished "rm -rf repo-bare.git" &&
+	git clone --bare . repo-bare.git &&
+	test_when_finished "rm -rf repo-wt" &&
+	git -C repo-bare.git worktree add ../repo-wt &&
+
+	test_when_finished "rm -f .gitconfig" &&
+	test_config_global protocol.file.allow always &&
+	git -C repo-wt submodule update --init &&
+	git init repo-wt/sub2 &&
+	test_commit -C repo-wt/sub2 A &&
+	git -C repo-wt submodule add ./sub2 sub2 &&
+	cat >expect <<-EOF &&
+	Migrating git directory of '\''sub2'\'' from
+	'\''$cwd/repo-wt/sub2/.git'\'' to
+	'\''$cwd/repo-bare.git/worktrees/repo-wt/modules/sub2'\''
+	EOF
+	git -C repo-wt submodule absorbgitdirs 2>actual &&
+	test_cmp expect actual
+'
+
 test_expect_success 'setup a gitlink with missing .gitmodules entry' '
 	git init sub2 &&
 	test_commit -C sub2 first &&
@@ -106,7 +150,11 @@ test_expect_success 'setup a gitlink with missing .gitmodules entry' '
 test_expect_success 'absorbing the git dir fails for incomplete submodules' '
 	git status >expect.1 &&
 	git -C sub2 rev-parse HEAD >expect.2 &&
-	test_must_fail git submodule absorbgitdirs &&
+	cat >expect <<-\EOF &&
+	fatal: could not lookup name for submodule '\''sub2'\''
+	EOF
+	test_must_fail git submodule absorbgitdirs 2>actual &&
+	test_cmp expect actual &&
 	git -C sub2 fsck &&
 	test -d sub2/.git &&
 	git status >actual &&
@@ -126,8 +174,11 @@ test_expect_success 'setup a submodule with multiple worktrees' '
 '
 
 test_expect_success 'absorbing fails for a submodule with multiple worktrees' '
-	test_must_fail git submodule absorbgitdirs sub3 2>error &&
-	test_i18ngrep "not supported" error
+	cat >expect <<-\EOF &&
+	fatal: could not lookup name for submodule '\''sub2'\''
+	EOF
+	test_must_fail git submodule absorbgitdirs 2>actual &&
+	test_cmp expect actual
 '
 
 test_done
diff --git a/t/t7413-submodule-is-active.sh b/t/t7413-submodule-is-active.sh
index c8e7e98..887d181 100755
--- a/t/t7413-submodule-is-active.sh
+++ b/t/t7413-submodule-is-active.sh
@@ -1,14 +1,19 @@
 #!/bin/sh
 
-test_description='Test submodule--helper is-active
+test_description='Test with test-tool submodule is-active
 
-This test verifies that `git submodue--helper is-active` correctly identifies
+This test verifies that `test-tool submodule is-active` correctly identifies
 submodules which are "active" and interesting to the user.
+
+This is a unit test of the submodule.c is_submodule_active() function,
+which is also indirectly tested elsewhere.
 '
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
+	git config --global protocol.file.allow always &&
 	git init sub &&
 	test_commit -C sub initial &&
 	git init super &&
@@ -25,13 +30,13 @@ test_expect_success 'setup' '
 '
 
 test_expect_success 'is-active works with urls' '
-	git -C super submodule--helper is-active sub1 &&
-	git -C super submodule--helper is-active sub2 &&
+	test-tool -C super submodule is-active sub1 &&
+	test-tool -C super submodule is-active sub2 &&
 
 	git -C super config --unset submodule.sub1.URL &&
-	test_must_fail git -C super submodule--helper is-active sub1 &&
+	test_must_fail test-tool -C super submodule is-active sub1 &&
 	git -C super config submodule.sub1.URL ../sub &&
-	git -C super submodule--helper is-active sub1
+	test-tool -C super submodule is-active sub1
 '
 
 test_expect_success 'is-active works with submodule.<name>.active config' '
@@ -39,11 +44,27 @@ test_expect_success 'is-active works with submodule.<name>.active config' '
 	test_when_finished "git -C super config submodule.sub1.URL ../sub" &&
 
 	git -C super config --bool submodule.sub1.active "false" &&
-	test_must_fail git -C super submodule--helper is-active sub1 &&
+	test_must_fail test-tool -C super submodule is-active sub1 &&
 
 	git -C super config --bool submodule.sub1.active "true" &&
 	git -C super config --unset submodule.sub1.URL &&
-	git -C super submodule--helper is-active sub1
+	test-tool -C super submodule is-active sub1
+'
+
+test_expect_success 'is-active handles submodule.active config missing a value' '
+	cp super/.git/config super/.git/config.orig &&
+	test_when_finished mv super/.git/config.orig super/.git/config &&
+
+	cat >>super/.git/config <<-\EOF &&
+	[submodule]
+		active
+	EOF
+
+	cat >expect <<-\EOF &&
+	error: missing value for '\''submodule.active'\''
+	EOF
+	test-tool -C super submodule is-active sub1 2>actual &&
+	test_cmp expect actual
 '
 
 test_expect_success 'is-active works with basic submodule.active config' '
@@ -53,17 +74,17 @@ test_expect_success 'is-active works with basic submodule.active config' '
 	git -C super config --add submodule.active "." &&
 	git -C super config --unset submodule.sub1.URL &&
 
-	git -C super submodule--helper is-active sub1 &&
-	git -C super submodule--helper is-active sub2
+	test-tool -C super submodule is-active sub1 &&
+	test-tool -C super submodule is-active sub2
 '
 
 test_expect_success 'is-active correctly works with paths that are not submodules' '
 	test_when_finished "git -C super config --unset-all submodule.active" &&
 
-	test_must_fail git -C super submodule--helper is-active not-a-submodule &&
+	test_must_fail test-tool -C super submodule is-active not-a-submodule &&
 
 	git -C super config --add submodule.active "." &&
-	test_must_fail git -C super submodule--helper is-active not-a-submodule
+	test_must_fail test-tool -C super submodule is-active not-a-submodule
 '
 
 test_expect_success 'is-active works with exclusions in submodule.active config' '
@@ -72,8 +93,8 @@ test_expect_success 'is-active works with exclusions in submodule.active config'
 	git -C super config --add submodule.active "." &&
 	git -C super config --add submodule.active ":(exclude)sub1" &&
 
-	test_must_fail git -C super submodule--helper is-active sub1 &&
-	git -C super submodule--helper is-active sub2
+	test_must_fail test-tool -C super submodule is-active sub1 &&
+	test-tool -C super submodule is-active sub2
 '
 
 test_expect_success 'is-active with submodule.active and submodule.<name>.active' '
@@ -85,8 +106,8 @@ test_expect_success 'is-active with submodule.active and submodule.<name>.active
 	git -C super config --bool submodule.sub1.active "false" &&
 	git -C super config --bool submodule.sub2.active "true" &&
 
-	test_must_fail git -C super submodule--helper is-active sub1 &&
-	git -C super submodule--helper is-active sub2
+	test_must_fail test-tool -C super submodule is-active sub1 &&
+	test-tool -C super submodule is-active sub2
 '
 
 test_expect_success 'is-active, submodule.active and submodule add' '
diff --git a/t/t7414-submodule-mistakes.sh b/t/t7414-submodule-mistakes.sh
index f2e7df5..24f30e3 100755
--- a/t/t7414-submodule-mistakes.sh
+++ b/t/t7414-submodule-mistakes.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='handling of common mistakes people may make with submodules'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'create embedded repository' '
@@ -11,13 +13,13 @@ test_expect_success 'create embedded repository' '
 test_expect_success 'git-add on embedded repository warns' '
 	test_when_finished "git rm --cached -f embed" &&
 	git add embed 2>stderr &&
-	test_i18ngrep warning stderr
+	test_grep warning stderr
 '
 
 test_expect_success '--no-warn-embedded-repo suppresses warning' '
 	test_when_finished "git rm --cached -f embed" &&
 	git add --no-warn-embedded-repo embed 2>stderr &&
-	test_i18ngrep ! warning stderr
+	test_grep ! warning stderr
 '
 
 test_expect_success 'no warning when updating entry' '
@@ -25,13 +27,14 @@ test_expect_success 'no warning when updating entry' '
 	git add embed &&
 	git -C embed commit --allow-empty -m two &&
 	git add embed 2>stderr &&
-	test_i18ngrep ! warning stderr
+	test_grep ! warning stderr
 '
 
 test_expect_success 'submodule add does not warn' '
 	test_when_finished "git rm -rf submodule .gitmodules" &&
-	git submodule add ./embed submodule 2>stderr &&
-	test_i18ngrep ! warning stderr
+	git -c protocol.file.allow=always \
+		submodule add ./embed submodule 2>stderr &&
+	test_grep ! warning stderr
 '
 
 test_done
diff --git a/t/t7416-submodule-dash-url.sh b/t/t7416-submodule-dash-url.sh
index eec96e0..2ab566e 100755
--- a/t/t7416-submodule-dash-url.sh
+++ b/t/t7416-submodule-dash-url.sh
@@ -1,8 +1,14 @@
 #!/bin/sh
 
 test_description='check handling of disallowed .gitmodule urls'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
+test_expect_success 'setup' '
+	git config --global protocol.file.allow always
+'
+
 test_expect_success 'create submodule with protected dash in url' '
 	git init upstream &&
 	git -C upstream commit --allow-empty -m base &&
@@ -35,7 +41,7 @@ test_expect_success 'remove ./ protection from .gitmodules url' '
 test_expect_success 'clone rejects unprotected dash' '
 	test_when_finished "rm -rf dst" &&
 	test_must_fail git clone --recurse-submodules . dst 2>err &&
-	test_i18ngrep ignoring err
+	test_grep ignoring err
 '
 
 test_expect_success 'fsck rejects unprotected dash' '
@@ -57,7 +63,7 @@ test_expect_success 'trailing backslash is handled correctly' '
 	mv .new .gitmodules &&
 	git commit -am "Add testmodule" &&
 	test_must_fail git clone --verbose --recurse-submodules . dolly 2>err &&
-	test_i18ngrep ! "unknown option" err
+	test_grep ! "unknown option" err
 '
 
 test_expect_success 'fsck rejects missing URL scheme' '
@@ -201,4 +207,19 @@ test_expect_success 'fsck rejects embedded newline in relative url' '
 	grep gitmodulesUrl err
 '
 
+test_expect_success 'fsck rejects embedded newline in git url' '
+	git checkout --orphan git-newline &&
+	cat >.gitmodules <<-\EOF &&
+	[submodule "foo"]
+	url = "git://example.com:1234/repo%0a.git"
+	EOF
+	git add .gitmodules &&
+	git commit -m "git url with newline" &&
+	test_when_finished "rm -rf dst" &&
+	git init --bare dst &&
+	git -C dst config transfer.fsckObjects true &&
+	test_must_fail git push dst HEAD 2>err &&
+	grep gitmodulesUrl err
+'
+
 test_done
diff --git a/t/t7417-submodule-path-url.sh b/t/t7417-submodule-path-url.sh
index f7e7e94..5e3051d 100755
--- a/t/t7417-submodule-path-url.sh
+++ b/t/t7417-submodule-path-url.sh
@@ -1,8 +1,15 @@
 #!/bin/sh
 
 test_description='check handling of .gitmodule path with dash'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
+test_expect_success 'setup' '
+	git config --global protocol.file.allow always
+'
+
 test_expect_success 'create submodule with dash in path' '
 	git init upstream &&
 	git -C upstream commit --allow-empty -m base &&
@@ -14,7 +21,7 @@ test_expect_success 'create submodule with dash in path' '
 test_expect_success 'clone rejects unprotected dash' '
 	test_when_finished "rm -rf dst" &&
 	git clone --recurse-submodules . dst 2>err &&
-	test_i18ngrep ignoring err
+	test_grep ignoring err
 '
 
 test_expect_success 'fsck rejects unprotected dash' '
@@ -36,10 +43,10 @@ test_expect_success MINGW 'submodule paths disallows trailing spaces' '
 	sed "s/sub/sub /" <tree >tree.new &&
 	tree=$(git -C super mktree <tree.new) &&
 	commit=$(echo with space | git -C super commit-tree $tree) &&
-	git -C super update-ref refs/heads/master $commit &&
+	git -C super update-ref refs/heads/main $commit &&
 
 	test_must_fail git clone --recurse-submodules super dst 2>err &&
-	test_i18ngrep "sub " err
+	test_grep "sub " err
 '
 
 test_done
diff --git a/t/t7418-submodule-sparse-gitmodules.sh b/t/t7418-submodule-sparse-gitmodules.sh
index 3f7f2718..dde11ec 100755
--- a/t/t7418-submodule-sparse-gitmodules.sh
+++ b/t/t7418-submodule-sparse-gitmodules.sh
@@ -12,8 +12,15 @@ The test setup uses a sparse checkout, however the same scenario can be set up
 also by committing .gitmodules and then just removing it from the filesystem.
 '
 
+GIT_TEST_FATAL_REGISTER_SUBMODULE_ODB=1
+export GIT_TEST_FATAL_REGISTER_SUBMODULE_ODB
+
 . ./test-lib.sh
 
+test_expect_success 'setup' '
+	git config --global protocol.file.allow always
+'
+
 test_expect_success 'sparse checkout setup which hides .gitmodules' '
 	git init upstream &&
 	git init submodule &&
@@ -28,8 +35,9 @@ test_expect_success 'sparse checkout setup which hides .gitmodules' '
 		test_tick &&
 		git commit -m "Add submodule"
 	) &&
-	git clone upstream super &&
+	git clone --template= upstream super &&
 	(cd super &&
+		mkdir .git/info &&
 		cat >.git/info/sparse-checkout <<-\EOF &&
 		/*
 		!/.gitmodules
@@ -42,12 +50,12 @@ test_expect_success 'sparse checkout setup which hides .gitmodules' '
 
 test_expect_success 'reading gitmodules config file when it is not checked out' '
 	echo "../submodule" >expect &&
-	git -C super submodule--helper config submodule.submodule.url >actual &&
+	test-tool -C super submodule config-list submodule.submodule.url >actual &&
 	test_cmp expect actual
 '
 
 test_expect_success 'not writing gitmodules config file when it is not checked out' '
-	test_must_fail git -C super submodule--helper config submodule.submodule.url newurl &&
+	test_must_fail test-tool -C super submodule config-set submodule.submodule.url newurl &&
 	test_path_is_missing super/.gitmodules
 '
 
diff --git a/t/t7419-submodule-set-branch.sh b/t/t7419-submodule-set-branch.sh
index 3b925c3..a5d1bc5 100755
--- a/t/t7419-submodule-set-branch.sh
+++ b/t/t7419-submodule-set-branch.sh
@@ -9,9 +9,18 @@ This test verifies that the set-branch subcommand of git-submodule is working
 as expected.
 '
 
+TEST_PASSES_SANITIZE_LEAK=true
 TEST_NO_CREATE_REPO=1
+
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
+test_expect_success 'setup' '
+	git config --global protocol.file.allow always
+'
+
 test_expect_success 'submodule config cache setup' '
 	mkdir submodule &&
 	(cd submodule &&
@@ -22,26 +31,28 @@ test_expect_success 'submodule config cache setup' '
 		git checkout -b topic &&
 		echo b >a &&
 		git add . &&
-		git commit -mb
+		git commit -mb &&
+		git checkout main
 	) &&
 	mkdir super &&
 	(cd super &&
 		git init &&
 		git submodule add ../submodule &&
-		git commit -m "add submodule"
+		git submodule add --name thename ../submodule thepath &&
+		git commit -m "add submodules"
 	)
 '
 
 test_expect_success 'ensure submodule branch is unset' '
 	(cd super &&
-		! grep branch .gitmodules
+		test_cmp_config "" -f .gitmodules --default "" submodule.submodule.branch
 	)
 '
 
 test_expect_success 'test submodule set-branch --branch' '
 	(cd super &&
 		git submodule set-branch --branch topic submodule &&
-		grep "branch = topic" .gitmodules &&
+		test_cmp_config topic -f .gitmodules submodule.submodule.branch &&
 		git submodule update --remote &&
 		cat <<-\EOF >expect &&
 		b
@@ -52,13 +63,12 @@ test_expect_success 'test submodule set-branch --branch' '
 '
 
 test_expect_success 'test submodule set-branch --default' '
-	test_commit -C submodule c &&
 	(cd super &&
 		git submodule set-branch --default submodule &&
-		! grep branch .gitmodules &&
+		test_cmp_config "" -f .gitmodules --default "" submodule.submodule.branch &&
 		git submodule update --remote &&
 		cat <<-\EOF >expect &&
-		c
+		a
 		EOF
 		git -C submodule show -s --pretty=%s >actual &&
 		test_cmp expect actual
@@ -66,10 +76,9 @@ test_expect_success 'test submodule set-branch --default' '
 '
 
 test_expect_success 'test submodule set-branch -b' '
-	test_commit -C submodule b &&
 	(cd super &&
 		git submodule set-branch -b topic submodule &&
-		grep "branch = topic" .gitmodules &&
+		test_cmp_config topic -f .gitmodules submodule.submodule.branch &&
 		git submodule update --remote &&
 		cat <<-\EOF >expect &&
 		b
@@ -80,17 +89,43 @@ test_expect_success 'test submodule set-branch -b' '
 '
 
 test_expect_success 'test submodule set-branch -d' '
-	test_commit -C submodule d &&
 	(cd super &&
 		git submodule set-branch -d submodule &&
-		! grep branch .gitmodules &&
+		test_cmp_config "" -f .gitmodules --default "" submodule.submodule.branch &&
 		git submodule update --remote &&
 		cat <<-\EOF >expect &&
-		d
+		a
 		EOF
 		git -C submodule show -s --pretty=%s >actual &&
 		test_cmp expect actual
 	)
 '
 
+test_expect_success 'test submodule set-branch --branch with named submodule' '
+	(cd super &&
+		git submodule set-branch --branch topic thepath &&
+		test_cmp_config topic -f .gitmodules submodule.thename.branch &&
+		test_cmp_config "" -f .gitmodules --default "" submodule.thepath.branch &&
+		git submodule update --remote &&
+		cat <<-\EOF >expect &&
+		b
+		EOF
+		git -C thepath show -s --pretty=%s >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'test submodule set-branch --default with named submodule' '
+	(cd super &&
+		git submodule set-branch --default thepath &&
+		test_cmp_config "" -f .gitmodules --default "" submodule.thename.branch &&
+		git submodule update --remote &&
+		cat <<-\EOF >expect &&
+		a
+		EOF
+		git -C thepath show -s --pretty=%s >actual &&
+		test_cmp expect actual
+	)
+'
+
 test_done
diff --git a/t/t7420-submodule-set-url.sh b/t/t7420-submodule-set-url.sh
index ef0cb6e..bf7f15e 100755
--- a/t/t7420-submodule-set-url.sh
+++ b/t/t7420-submodule-set-url.sh
@@ -12,6 +12,10 @@ as expected.
 TEST_NO_CREATE_REPO=1
 . ./test-lib.sh
 
+test_expect_success 'setup' '
+	git config --global protocol.file.allow always
+'
+
 test_expect_success 'submodule config cache setup' '
 	mkdir submodule &&
 	(
@@ -21,17 +25,26 @@ test_expect_success 'submodule config cache setup' '
 		git add file &&
 		git commit -ma
 	) &&
+	mkdir namedsubmodule &&
+	(
+		cd namedsubmodule &&
+		git init &&
+		echo 1 >file &&
+		git add file &&
+		git commit -m1
+	) &&
 	mkdir super &&
 	(
 		cd super &&
 		git init &&
 		git submodule add ../submodule &&
-		git commit -m "add submodule"
+		git submodule add --name thename ../namedsubmodule thepath &&
+		git commit -m "add submodules"
 	)
 '
 
 test_expect_success 'test submodule set-url' '
-	# add a commit and move the submodule (change the url)
+	# add commits and move the submodules (change the urls)
 	(
 		cd submodule &&
 		echo b >>file &&
@@ -40,15 +53,28 @@ test_expect_success 'test submodule set-url' '
 	) &&
 	mv submodule newsubmodule &&
 
+	(
+		cd namedsubmodule &&
+		echo 2 >>file &&
+		git add file &&
+		git commit -m2
+	) &&
+	mv namedsubmodule newnamedsubmodule &&
+
 	git -C newsubmodule show >expect &&
+	git -C newnamedsubmodule show >>expect &&
 	(
 		cd super &&
 		test_must_fail git submodule update --remote &&
 		git submodule set-url submodule ../newsubmodule &&
-		grep -F "url = ../newsubmodule" .gitmodules &&
+		test_cmp_config ../newsubmodule -f .gitmodules submodule.submodule.url &&
+		git submodule set-url thepath ../newnamedsubmodule &&
+		test_cmp_config ../newnamedsubmodule -f .gitmodules submodule.thename.url &&
+		test_cmp_config "" -f .gitmodules --default "" submodule.thepath.url &&
 		git submodule update --remote
 	) &&
 	git -C super/submodule show >actual &&
+	git -C super/thepath show >>actual &&
 	test_cmp expect actual
 '
 
diff --git a/t/t7421-submodule-summary-add.sh b/t/t7421-submodule-summary-add.sh
new file mode 100755
index 0000000..ce64d8b
--- /dev/null
+++ b/t/t7421-submodule-summary-add.sh
@@ -0,0 +1,73 @@
+#!/bin/sh
+#
+# Copyright (C) 2020 Shourya Shukla
+#
+
+test_description='Summary support for submodules, adding them using git submodule add
+
+This test script tries to verify the sanity of summary subcommand of git submodule
+while making sure to add submodules using `git submodule add` instead of
+`git add` as done in t7401.
+'
+
+. ./test-lib.sh
+
+test_expect_success 'setup' '
+	git config --global protocol.file.allow always
+'
+
+test_expect_success 'summary test environment setup' '
+	git init sm &&
+	test_commit -C sm "add file" file file-content file-tag &&
+
+	git submodule add ./sm my-subm &&
+	test_tick &&
+	git commit -m "add submodule"
+'
+
+test_expect_success 'submodule summary output for initialized submodule' '
+	test_commit -C sm "add file2" file2 file2-content file2-tag &&
+	git submodule update --remote &&
+	test_tick &&
+	git commit -m "update submodule" my-subm &&
+	git submodule summary HEAD^ >actual &&
+	rev1=$(git -C sm rev-parse --short HEAD^) &&
+	rev2=$(git -C sm rev-parse --short HEAD) &&
+	cat >expected <<-EOF &&
+	* my-subm ${rev1}...${rev2} (1):
+	  > add file2
+
+	EOF
+	test_cmp expected actual
+'
+
+test_expect_success 'submodule summary output for deinitialized submodule' '
+	git submodule deinit my-subm &&
+	git submodule summary HEAD^ >actual &&
+	test_must_be_empty actual &&
+	git submodule update --init my-subm &&
+	git submodule summary HEAD^ >actual &&
+	rev1=$(git -C sm rev-parse --short HEAD^) &&
+	rev2=$(git -C sm rev-parse --short HEAD) &&
+	cat >expected <<-EOF &&
+	* my-subm ${rev1}...${rev2} (1):
+	  > add file2
+
+	EOF
+	test_cmp expected actual
+'
+
+test_expect_success 'submodule summary output for submodules with changed paths' '
+	git mv my-subm subm &&
+	git commit -m "change submodule path" &&
+	rev=$(git -C sm rev-parse --short HEAD^) &&
+	git submodule summary HEAD^^ -- my-subm >actual 2>err &&
+	test_must_be_empty err &&
+	cat >expected <<-EOF &&
+	* my-subm ${rev}...0000000:
+
+	EOF
+	test_cmp expected actual
+'
+
+test_done
diff --git a/t/t7422-submodule-output.sh b/t/t7422-submodule-output.sh
new file mode 100755
index 0000000..ab946ec
--- /dev/null
+++ b/t/t7422-submodule-output.sh
@@ -0,0 +1,170 @@
+#!/bin/sh
+
+test_description='submodule --cached, --quiet etc. output'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-t3100.sh
+
+setup_sub () {
+	local d="$1" &&
+	shift &&
+	git $@ clone . "$d" &&
+	git $@ submodule add ./"$d"
+}
+
+normalize_status () {
+	sed -e 's/-g[0-9a-f]*/-gHASH/'
+}
+
+test_expect_success 'setup' '
+	test_commit A &&
+	test_commit B &&
+	setup_sub S  &&
+	setup_sub S.D &&
+	setup_sub S.C &&
+	setup_sub S.C.D &&
+	setup_sub X &&
+	git add S* &&
+	test_commit C &&
+
+	# recursive in X/
+	git -C X pull &&
+	GIT_ALLOW_PROTOCOL=file git -C X submodule update --init &&
+
+	# dirty
+	for d in S.D X/S.D
+	do
+		echo dirty >"$d"/A.t || return 1
+	done &&
+
+	# commit (for --cached)
+	for d in S.C* X/S.C*
+	do
+		git -C "$d" reset --hard A || return 1
+	done &&
+
+	# dirty
+	for d in S*.D X/S*.D
+	do
+		echo dirty >"$d/C2.t" || return 1
+	done &&
+
+	for ref in A B C
+	do
+		# Not different with SHA-1 and SHA-256, just (ab)using
+		# test_oid_cache as a variable bag to avoid using
+		# $(git rev-parse ...).
+		oid=$(git rev-parse $ref) &&
+		test_oid_cache <<-EOF || return 1
+		$ref sha1:$oid
+		$ref sha256:$oid
+		EOF
+	done
+'
+
+for opts in "" "status"
+do
+	test_expect_success "git submodule $opts" '
+		sed -e "s/^>//" >expect <<-EOF &&
+		> $(test_oid B) S (B)
+		>+$(test_oid A) S.C (A)
+		>+$(test_oid A) S.C.D (A)
+		> $(test_oid B) S.D (B)
+		>+$(test_oid C) X (C)
+		EOF
+		git submodule $opts >actual.raw &&
+		normalize_status <actual.raw >actual &&
+		test_cmp expect actual
+	'
+done
+
+for opts in \
+	"status --recursive"
+do
+	test_expect_success "git submodule $opts" '
+		sed -e "s/^>//" >expect <<-EOF &&
+		> $(test_oid B) S (B)
+		>+$(test_oid A) S.C (A)
+		>+$(test_oid A) S.C.D (A)
+		> $(test_oid B) S.D (B)
+		>+$(test_oid C) X (C)
+		> $(test_oid B) X/S (B)
+		>+$(test_oid A) X/S.C (A)
+		>+$(test_oid A) X/S.C.D (A)
+		> $(test_oid B) X/S.D (B)
+		> $(test_oid B) X/X (B)
+		EOF
+		git submodule $opts >actual.raw &&
+		normalize_status <actual.raw >actual &&
+		test_cmp expect actual
+	'
+done
+
+for opts in \
+	"--quiet" \
+	"--quiet status" \
+	"status --quiet"
+do
+	test_expect_success "git submodule $opts" '
+		git submodule $opts >out &&
+		test_must_be_empty out
+	'
+done
+
+for opts in \
+	"--cached" \
+	"--cached status" \
+	"status --cached"
+do
+	test_expect_success "git submodule $opts" '
+		sed -e "s/^>//" >expect <<-EOF &&
+		> $(test_oid B) S (B)
+		>+$(test_oid B) S.C (B)
+		>+$(test_oid B) S.C.D (B)
+		> $(test_oid B) S.D (B)
+		>+$(test_oid B) X (B)
+		EOF
+		git submodule $opts >actual.raw &&
+		normalize_status <actual.raw >actual &&
+		test_cmp expect actual
+	'
+done
+
+for opts in \
+	"--cached --quiet" \
+	"--cached --quiet status" \
+	"--cached status --quiet" \
+	"--quiet status --cached" \
+	"status --cached --quiet"
+do
+	test_expect_success "git submodule $opts" '
+		git submodule $opts >out &&
+		test_must_be_empty out
+	'
+done
+
+for opts in \
+	"status --cached --recursive" \
+	"--cached status --recursive"
+do
+	test_expect_success "git submodule $opts" '
+		sed -e "s/^>//" >expect <<-EOF &&
+		> $(test_oid B) S (B)
+		>+$(test_oid B) S.C (B)
+		>+$(test_oid B) S.C.D (B)
+		> $(test_oid B) S.D (B)
+		>+$(test_oid B) X (B)
+		> $(test_oid B) X/S (B)
+		>+$(test_oid B) X/S.C (B)
+		>+$(test_oid B) X/S.C.D (B)
+		> $(test_oid B) X/S.D (B)
+		> $(test_oid B) X/X (B)
+		EOF
+		git submodule $opts >actual.raw &&
+		normalize_status <actual.raw >actual &&
+		test_cmp expect actual
+	'
+done
+
+test_done
diff --git a/t/t7415-submodule-names.sh b/t/t7450-bad-git-dotfiles.sh
index f70368b..46d4fb0 100755
--- a/t/t7415-submodule-names.sh
+++ b/t/t7450-bad-git-dotfiles.sh
@@ -1,20 +1,33 @@
 #!/bin/sh
 
-test_description='check handling of .. in submodule names
+test_description='check broken or malicious patterns in .git* files
 
-Exercise the name-checking function on a variety of names, and then give a
-real-world setup that confirms we catch this in practice.
+Such as:
+
+  - presence of .. in submodule names;
+    Exercise the name-checking function on a variety of names, and then give a
+    real-world setup that confirms we catch this in practice.
+
+  - nested submodule names
+
+  - symlinked .gitmodules, etc
 '
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-pack.sh
 
+test_expect_success 'setup' '
+	git config --global protocol.file.allow always
+'
+
 test_expect_success 'check names' '
 	cat >expect <<-\EOF &&
 	valid
 	valid/with/paths
 	EOF
 
-	git submodule--helper check-name >actual <<-\EOF &&
+	test-tool submodule check-name >actual <<-\EOF &&
 	valid
 	valid/with/paths
 
@@ -32,6 +45,32 @@ test_expect_success 'check names' '
 	test_cmp expect actual
 '
 
+test_expect_success 'check urls' '
+	cat >expect <<-\EOF &&
+	./bar/baz/foo.git
+	https://example.com/foo.git
+	http://example.com:80/deeper/foo.git
+	EOF
+
+	test-tool submodule check-url >actual <<-\EOF &&
+	./bar/baz/foo.git
+	https://example.com/foo.git
+	http://example.com:80/deeper/foo.git
+	-a./foo
+	../../..//test/foo.git
+	../../../../../:localhost:8080/foo.git
+	..\../.\../:example.com/foo.git
+	./%0ahost=example.com/foo.git
+	https://one.example.com/evil?%0ahost=two.example.com
+	https:///example.com/foo.git
+	http://example.com:test/foo.git
+	https::example.com/foo.git
+	http:::example.com/foo.git
+	EOF
+
+	test_cmp expect actual
+'
+
 test_expect_success 'create innocent subrepo' '
 	git init innocent &&
 	git -C innocent commit --allow-empty -m foo
@@ -132,31 +171,84 @@ test_expect_success 'index-pack --strict works for non-repo pack' '
 	grep gitmodulesName output
 '
 
-test_expect_success 'fsck detects symlinked .gitmodules file' '
-	git init symlink &&
-	(
-		cd symlink &&
-
-		# Make the tree directly to avoid index restrictions.
-		#
-		# Because symlinks store the target as a blob, choose
-		# a pathname that could be parsed as a .gitmodules file
-		# to trick naive non-symlink-aware checking.
-		tricky="[foo]bar=true" &&
-		content=$(git hash-object -w ../.gitmodules) &&
-		target=$(printf "$tricky" | git hash-object -w --stdin) &&
-		{
-			printf "100644 blob $content\t$tricky\n" &&
-			printf "120000 blob $target\t.gitmodules\n"
-		} | git mktree &&
-
-		# Check not only that we fail, but that it is due to the
-		# symlink detector; this grep string comes from the config
-		# variable name and will not be translated.
-		test_must_fail git fsck 2>output &&
-		test_i18ngrep gitmodulesSymlink output
-	)
-'
+check_dotx_symlink () {
+	fsck_must_fail=test_must_fail
+	fsck_prefix=error
+	refuse_index=t
+	case "$1" in
+	--warning)
+		fsck_must_fail=
+		fsck_prefix=warning
+		refuse_index=
+		shift
+		;;
+	esac
+
+	name=$1
+	type=$2
+	path=$3
+	dir=symlink-$name-$type
+
+	test_expect_success "set up repo with symlinked $name ($type)" '
+		git init $dir &&
+		(
+			cd $dir &&
+
+			# Make the tree directly to avoid index restrictions.
+			#
+			# Because symlinks store the target as a blob, choose
+			# a pathname that could be parsed as a .gitmodules file
+			# to trick naive non-symlink-aware checking.
+			tricky="[foo]bar=true" &&
+			content=$(git hash-object -w ../.gitmodules) &&
+			target=$(printf "$tricky" | git hash-object -w --stdin) &&
+			{
+				printf "100644 blob $content\t$tricky\n" &&
+				printf "120000 blob $target\t$path\n"
+			} >bad-tree
+		) &&
+		tree=$(git -C $dir mktree <$dir/bad-tree)
+	'
+
+	test_expect_success "fsck detects symlinked $name ($type)" '
+		(
+			cd $dir &&
+
+			# Check not only that we fail, but that it is due to the
+			# symlink detector
+			$fsck_must_fail git fsck 2>output &&
+			grep "$fsck_prefix.*tree $tree: ${name}Symlink" output
+		)
+	'
+
+	test -n "$refuse_index" &&
+	test_expect_success "refuse to load symlinked $name into index ($type)" '
+		test_must_fail \
+			git -C $dir \
+			    -c core.protectntfs \
+			    -c core.protecthfs \
+			    read-tree $tree 2>err &&
+		grep "invalid path.*$name" err &&
+		git -C $dir ls-files -s >out &&
+		test_must_be_empty out
+	'
+}
+
+check_dotx_symlink gitmodules vanilla .gitmodules
+check_dotx_symlink gitmodules ntfs ".gitmodules ."
+check_dotx_symlink gitmodules hfs ".${u200c}gitmodules"
+
+check_dotx_symlink --warning gitattributes vanilla .gitattributes
+check_dotx_symlink --warning gitattributes ntfs ".gitattributes ."
+check_dotx_symlink --warning gitattributes hfs ".${u200c}gitattributes"
+
+check_dotx_symlink --warning gitignore vanilla .gitignore
+check_dotx_symlink --warning gitignore ntfs ".gitignore ."
+check_dotx_symlink --warning gitignore hfs ".${u200c}gitignore"
+
+check_dotx_symlink --warning mailmap vanilla .mailmap
+check_dotx_symlink --warning mailmap ntfs ".mailmap ."
+check_dotx_symlink --warning mailmap hfs ".${u200c}mailmap"
 
 test_expect_success 'fsck detects non-blob .gitmodules' '
 	git init non-blob &&
@@ -172,7 +264,7 @@ test_expect_success 'fsck detects non-blob .gitmodules' '
 		git ls-tree HEAD | sed s/subdir/.gitmodules/ | git mktree &&
 
 		test_must_fail git fsck 2>output &&
-		test_i18ngrep gitmodulesBlob output
+		test_grep gitmodulesBlob output
 	)
 '
 
@@ -186,12 +278,12 @@ test_expect_success 'fsck detects corrupt .gitmodules' '
 		git commit -m "broken gitmodules" &&
 
 		git fsck 2>output &&
-		test_i18ngrep gitmodulesParse output &&
-		test_i18ngrep ! "bad config" output
+		test_grep gitmodulesParse output &&
+		test_grep ! "bad config" output
 	)
 '
 
-test_expect_success MINGW 'prevent git~1 squatting on Windows' '
+test_expect_success WINDOWS 'prevent git~1 squatting on Windows' '
 	git init squatting &&
 	(
 		cd squatting &&
@@ -209,7 +301,7 @@ test_expect_success MINGW 'prevent git~1 squatting on Windows' '
 		hash="$(echo x | git hash-object -w --stdin)" &&
 		test_must_fail git update-index --add \
 			--cacheinfo 160000,$rev,d\\a 2>err &&
-		test_i18ngrep "Invalid path" err &&
+		test_grep "Invalid path" err &&
 		git -c core.protectNTFS=false update-index --add \
 			--cacheinfo 100644,$modules,.gitmodules \
 			--cacheinfo 160000,$rev,c \
@@ -219,10 +311,13 @@ test_expect_success MINGW 'prevent git~1 squatting on Windows' '
 		test_tick &&
 		git -c core.protectNTFS=false commit -m "module"
 	) &&
-	test_must_fail git -c core.protectNTFS=false \
-		clone --recurse-submodules squatting squatting-clone 2>err &&
-	test_i18ngrep -e "directory not empty" -e "not an empty directory" err &&
-	! grep gitdir squatting-clone/d/a/git~2
+	if test_have_prereq MINGW
+	then
+		test_must_fail git -c core.protectNTFS=false \
+			clone --recurse-submodules squatting squatting-clone 2>err &&
+		test_grep -e "directory not empty" -e "not an empty directory" err &&
+		! grep gitdir squatting-clone/d/a/git~2
+	fi
 '
 
 test_expect_success 'git dirs of sibling submodules must not be nested' '
@@ -245,7 +340,7 @@ test_expect_success 'git dirs of sibling submodules must not be nested' '
 		git commit -m nested
 	) &&
 	test_must_fail git clone --recurse-submodules nested clone 2>err &&
-	test_i18ngrep "is inside git dir" err
+	test_grep "is inside git dir" err
 '
 
 test_done
diff --git a/t/t7500-commit-template-squash-signoff.sh b/t/t7500-commit-template-squash-signoff.sh
index 6d19ece..4dca8d9 100755
--- a/t/t7500-commit-template-squash-signoff.sh
+++ b/t/t7500-commit-template-squash-signoff.sh
@@ -9,13 +9,15 @@ Tests for template, signoff, squash and -F functions.'
 
 . ./test-lib.sh
 
+. "$TEST_DIRECTORY"/lib-rebase.sh
+
 commit_msg_is () {
 	expect=commit_msg_is.expect
 	actual=commit_msg_is.actual
 
 	printf "%s" "$(git log --pretty=format:%s%b -1)" >"$actual" &&
 	printf "%s" "$1" >"$expect" &&
-	test_i18ncmp "$expect" "$actual"
+	test_cmp "$expect" "$actual"
 }
 
 # A sanity check to see if commit is working at all.
@@ -268,7 +270,7 @@ EOF
 
 test_expect_success 'commit --fixup provides correct one-line commit message' '
 	commit_for_rebase_autosquash_setup &&
-	git commit --fixup HEAD~1 &&
+	EDITOR="echo ignored >>" git commit --fixup HEAD~1 &&
 	commit_msg_is "fixup! target message subject line"
 '
 
@@ -279,6 +281,171 @@ test_expect_success 'commit --fixup -m"something" -m"extra"' '
 
 extra"
 '
+test_expect_success 'commit --fixup --edit' '
+	commit_for_rebase_autosquash_setup &&
+	EDITOR="printf \"something\nextra\" >>" git commit --fixup HEAD~1 --edit &&
+	commit_msg_is "fixup! target message subject linesomething
+extra"
+'
+
+get_commit_msg () {
+	rev="$1" &&
+	git log -1 --pretty=format:"%B" "$rev"
+}
+
+test_expect_success 'commit --fixup=amend: creates amend! commit' '
+	commit_for_rebase_autosquash_setup &&
+	cat >expected <<-EOF &&
+	amend! $(git log -1 --format=%s HEAD~)
+
+	$(get_commit_msg HEAD~)
+
+	edited
+	EOF
+	(
+		set_fake_editor &&
+		FAKE_COMMIT_AMEND="edited" \
+			git commit --fixup=amend:HEAD~
+	) &&
+	get_commit_msg HEAD >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success '--fixup=amend: --only ignores staged changes' '
+	commit_for_rebase_autosquash_setup &&
+	cat >expected <<-EOF &&
+	amend! $(git log -1 --format=%s HEAD~)
+
+	$(get_commit_msg HEAD~)
+
+	edited
+	EOF
+	(
+		set_fake_editor &&
+		FAKE_COMMIT_AMEND="edited" \
+			git commit --fixup=amend:HEAD~ --only
+	) &&
+	get_commit_msg HEAD >actual &&
+	test_cmp expected actual &&
+	test_cmp_rev HEAD@{1}^{tree} HEAD^{tree} &&
+	test_cmp_rev HEAD@{1} HEAD^ &&
+	test_expect_code 1 git diff --cached --exit-code &&
+	git cat-file blob :foo >actual &&
+	test_cmp foo actual
+'
+
+test_expect_success '--fixup=reword: ignores staged changes' '
+	commit_for_rebase_autosquash_setup &&
+	cat >expected <<-EOF &&
+	amend! $(git log -1 --format=%s HEAD~)
+
+	$(get_commit_msg HEAD~)
+
+	edited
+	EOF
+	(
+		set_fake_editor &&
+		FAKE_COMMIT_AMEND="edited" \
+			git commit --fixup=reword:HEAD~
+	) &&
+	get_commit_msg HEAD >actual &&
+	test_cmp expected actual &&
+	test_cmp_rev HEAD@{1}^{tree} HEAD^{tree} &&
+	test_cmp_rev HEAD@{1} HEAD^ &&
+	test_expect_code 1 git diff --cached --exit-code &&
+	git cat-file blob :foo >actual &&
+	test_cmp foo actual
+'
+
+test_expect_success '--fixup=reword: error out with -m option' '
+	commit_for_rebase_autosquash_setup &&
+	echo "fatal: options '\''-m'\'' and '\''--fixup:reword'\'' cannot be used together" >expect &&
+	test_must_fail git commit --fixup=reword:HEAD~ -m "reword commit message" 2>actual &&
+	test_cmp expect actual
+'
+
+test_expect_success '--fixup=amend: error out with -m option' '
+	commit_for_rebase_autosquash_setup &&
+	echo "fatal: options '\''-m'\'' and '\''--fixup:amend'\'' cannot be used together" >expect &&
+	test_must_fail git commit --fixup=amend:HEAD~ -m "amend commit message" 2>actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'consecutive amend! commits remove amend! line from commit msg body' '
+	commit_for_rebase_autosquash_setup &&
+	cat >expected <<-EOF &&
+	amend! amend! $(git log -1 --format=%s HEAD~)
+
+	$(get_commit_msg HEAD~)
+
+	edited 1
+
+	edited 2
+	EOF
+	echo "reword new commit message" >actual &&
+	(
+		set_fake_editor &&
+		FAKE_COMMIT_AMEND="edited 1" \
+			git commit --fixup=reword:HEAD~ &&
+		FAKE_COMMIT_AMEND="edited 2" \
+			git commit --fixup=reword:HEAD
+	) &&
+	get_commit_msg HEAD >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'deny to create amend! commit if its commit msg body is empty' '
+	commit_for_rebase_autosquash_setup &&
+	echo "Aborting commit due to empty commit message body." >expected &&
+	(
+		set_fake_editor &&
+		test_must_fail env FAKE_COMMIT_MESSAGE="amend! target message subject line" \
+			git commit --fixup=amend:HEAD~ 2>actual
+	) &&
+	test_cmp expected actual
+'
+
+test_expect_success 'amend! commit allows empty commit msg body with --allow-empty-message' '
+	commit_for_rebase_autosquash_setup &&
+	cat >expected <<-EOF &&
+	amend! $(git log -1 --format=%s HEAD~)
+	EOF
+	(
+		set_fake_editor &&
+		FAKE_COMMIT_MESSAGE="amend! target message subject line" \
+			git commit --fixup=amend:HEAD~ --allow-empty-message &&
+		get_commit_msg HEAD >actual
+	) &&
+	test_cmp expected actual
+'
+
+test_fixup_reword_opt () {
+	test_expect_success "--fixup=reword: incompatible with $1" "
+		echo 'fatal: reword option of '\''--fixup'\'' and' \
+			''\''--patch/--interactive/--all/--include/--only'\' \
+			'cannot be used together' >expect &&
+		test_must_fail git commit --fixup=reword:HEAD~ $1 2>actual &&
+		test_cmp expect actual
+	"
+}
+
+for opt in --all --include --only --interactive --patch
+do
+	test_fixup_reword_opt $opt
+done
+
+test_expect_success '--fixup=reword: give error with pathsec' '
+	commit_for_rebase_autosquash_setup &&
+	echo "fatal: reword option of '\''--fixup'\'' and path '\''foo'\'' cannot be used together" >expect &&
+	test_must_fail git commit --fixup=reword:HEAD~ -- foo 2>actual &&
+	test_cmp expect actual
+'
+
+test_expect_success '--fixup=reword: -F give error message' '
+	echo "fatal: options '\''-F'\'' and '\''--fixup'\'' cannot be used together" >expect &&
+	test_must_fail git commit --fixup=reword:HEAD~ -F msg  2>actual &&
+	test_cmp expect actual
+'
 
 test_expect_success 'commit --squash works with -F' '
 	commit_for_rebase_autosquash_setup &&
@@ -339,7 +506,7 @@ test_expect_success 'invalid message options when using --fixup' '
 cat >expected-template <<EOF
 
 # Please enter the commit message for your changes. Lines starting
-# with '#' will be ignored, and an empty message aborts the commit.
+# with '#' will be ignored.
 #
 # Author:    A U Thor <author@example.com>
 #
@@ -356,7 +523,7 @@ test_expect_success 'new line found before status message in commit template' '
 	touch commit-template-check &&
 	git add commit-template-check &&
 	GIT_EDITOR="cat >editor-input" git commit --untracked-files=no --allow-empty-message &&
-	test_i18ncmp expected-template editor-input
+	test_cmp expected-template editor-input
 '
 
 test_expect_success 'setup empty commit with unstaged rename and copy' '
@@ -388,7 +555,7 @@ test_expect_success 'commit without staging files fails and displays hints' '
 	git commit -m initial &&
 	echo "changes" >>file &&
 	test_must_fail git commit -m update >actual &&
-	test_i18ngrep "no changes added to commit (use \"git add\" and/or \"git commit -a\")" actual
+	test_grep "no changes added to commit (use \"git add\" and/or \"git commit -a\")" actual
 '
 
 test_done
diff --git a/t/t7501-commit-basic-functionality.sh b/t/t7501-commit-basic-functionality.sh
index 110b4bf..cc12f99 100755
--- a/t/t7501-commit-basic-functionality.sh
+++ b/t/t7501-commit-basic-functionality.sh
@@ -3,12 +3,14 @@
 # Copyright (c) 2007 Kristian Høgsberg <krh@redhat.com>
 #
 
-# FIXME: Test the various index usages, -i and -o, test reflog,
-# signoff
+# FIXME: Test the various index usages, test reflog
 
 test_description='git commit'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
-. "$TEST_DIRECTORY/diff-lib.sh"
+. "$TEST_DIRECTORY/lib-diff.sh"
 
 author='The Real Author <someguy@his.email.org>'
 
@@ -18,7 +20,7 @@ test_expect_success 'initial status' '
 	echo bongo bongo >file &&
 	git add file &&
 	git status >actual &&
-	test_i18ngrep "No commits yet" actual
+	test_grep "No commits yet" actual
 '
 
 test_expect_success 'fail initial amend' '
@@ -89,6 +91,20 @@ test_expect_success '--long fails with nothing to commit' '
 	test_must_fail git commit -m initial --long
 '
 
+test_expect_success 'fail to commit untracked file (even with --include/--only)' '
+	echo content >baz &&
+	error="error: pathspec .baz. did not match any file(s) known to git" &&
+
+	test_must_fail git commit -m "baz" baz 2>err &&
+	test_grep -e "$error" err &&
+
+	test_must_fail git commit --only -m "baz" baz 2>err &&
+	test_grep -e "$error" err &&
+
+	test_must_fail git commit --include -m "baz" baz 2>err &&
+	test_grep -e "$error" err
+'
+
 test_expect_success 'setup: non-initial commit' '
 	echo bongo bongo bongo >file &&
 	git commit -m next -a
@@ -114,6 +130,51 @@ test_expect_success '--long with stuff to commit returns ok' '
 	git commit -m next -a --long
 '
 
+for opt in "" "-o" "--only"
+do
+	test_expect_success 'exclude additional staged changes when given pathspec' '
+		echo content >>file &&
+		echo content >>baz &&
+		git add baz &&
+		git commit $opt -m "file" file &&
+
+		git diff --name-only >actual &&
+		test_must_be_empty actual &&
+
+		test_write_lines baz >expect &&
+		git diff --name-only --cached >actual &&
+		test_cmp expect actual &&
+
+		test_write_lines file >expect &&
+		git diff --name-only HEAD^ HEAD >actual &&
+		test_cmp expect actual
+	'
+done
+
+test_expect_success '-i/--include includes staged changes' '
+	echo content >>file &&
+	echo content >>baz &&
+	git add file &&
+
+	# baz is in the index, therefore, it will be committed
+	git commit --include -m "file and baz" baz  &&
+
+	git diff --name-only HEAD >remaining &&
+	test_must_be_empty remaining &&
+
+	test_write_lines baz file >expect &&
+	git diff --name-only HEAD^ HEAD >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success '--include and --only do not mix' '
+	test_when_finished "git reset --hard" &&
+	echo content >>file &&
+	echo content >>baz &&
+	test_must_fail git commit --include --only -m "file baz" file baz 2>actual &&
+	test_grep -e "fatal: options .-i/--include. and .-o/--only. cannot be used together" actual
+'
+
 test_expect_success 'commit message from non-existing file' '
 	echo more bongo: bongo bongo bongo bongo >file &&
 	test_must_fail git commit -F gah -a
@@ -138,7 +199,7 @@ test_expect_success 'template "emptyness" check does not kick in with -F' '
 test_expect_success 'template "emptyness" check' '
 	git checkout HEAD file && echo >>file && git add file &&
 	test_must_fail git commit -t file 2>err &&
-	test_i18ngrep "did not edit" err
+	test_grep "did not edit" err
 '
 
 test_expect_success 'setup: commit message from file' '
@@ -386,6 +447,28 @@ test_expect_success 'amend commit to fix date' '
 
 '
 
+test_expect_success 'amend commit to add signoff' '
+
+	test_commit "msg" file content &&
+	git commit --amend --signoff &&
+	test_commit_message HEAD <<-EOF
+	msg
+
+	Signed-off-by: $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL>
+	EOF
+'
+
+test_expect_success 'amend does not add signoff if it already exists' '
+
+	test_commit --signoff "tenor" file newcontent &&
+	git commit --amend --signoff &&
+	test_commit_message HEAD <<-EOF
+	tenor
+
+	Signed-off-by: $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL>
+	EOF
+'
+
 test_expect_success 'commit mentions forced date in output' '
 	git commit --amend --date=2010-01-02T03:04:05 >output &&
 	grep "Date: *Sat Jan 2 03:04:05 2010" output
@@ -603,7 +686,7 @@ test_expect_success 'same tree (merge and amend merge)' '
 	echo zero >zero &&
 	git add zero &&
 	git commit -m "add zero" &&
-	git checkout master &&
+	git checkout main &&
 
 	git merge -s ours side -m "empty ok" &&
 	git diff HEAD^ HEAD >actual &&
@@ -664,14 +747,11 @@ test_expect_success 'amend can copy notes' '
 
 test_expect_success 'commit a file whose name is a dash' '
 	git reset --hard &&
-	for i in 1 2 3 4 5
-	do
-		echo $i
-	done >./- &&
+	test_write_lines 1 2 3 4 5 >./- &&
 	git add ./- &&
 	test_tick &&
 	git commit -m "add dash" >output </dev/null &&
-	test_i18ngrep " changed, 5 insertions" output
+	test_grep " changed, 5 insertions" output
 '
 
 test_expect_success '--only works on to-be-born branch' '
diff --git a/t/t7502-commit-porcelain.sh b/t/t7502-commit-porcelain.sh
index 14c92e4..b37e201 100755
--- a/t/t7502-commit-porcelain.sh
+++ b/t/t7502-commit-porcelain.sh
@@ -2,6 +2,9 @@
 
 test_description='git commit porcelain-ish'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 commit_msg_is () {
@@ -10,7 +13,7 @@ commit_msg_is () {
 
 	printf "%s" "$(git log --pretty=format:%s%b -1)" >$actual &&
 	printf "%s" "$1" >$expect &&
-	test_i18ncmp $expect $actual
+	test_cmp $expect $actual
 }
 
 # Arguments: [<prefix] [<commit message>] [<commit options>]
@@ -32,7 +35,17 @@ check_summary_oneline() {
 	SUMMARY_POSTFIX="$(git log -1 --pretty='format:%h')"
 	echo "[$SUMMARY_PREFIX $SUMMARY_POSTFIX] $2" >exp &&
 
-	test_i18ncmp exp act
+	test_cmp exp act
+}
+
+trailer_commit_base () {
+	echo "fun" >>file &&
+	git add file &&
+	git commit -s --trailer "Signed-off-by=C1 E1 " \
+		--trailer "Helped-by:C2 E2 " \
+		--trailer "Reported-by=C3 E3" \
+		--trailer "Mentored-by:C4 E4" \
+		-m "hello"
 }
 
 test_expect_success 'output summary format' '
@@ -76,7 +89,7 @@ test_expect_success 'output summary format for merges' '
 
 output_tests_cleanup() {
 	# this is needed for "do not fire editor in the presence of conflicts"
-	git checkout master &&
+	git checkout main &&
 
 	# this is needed for the "partial removal" test to pass
 	git rm file1 &&
@@ -151,6 +164,345 @@ test_expect_success 'sign off' '
 
 '
 
+test_expect_success 'commit --trailer with "="' '
+	trailer_commit_base &&
+	cat >expected <<-\EOF &&
+	hello
+
+	Signed-off-by: C O Mitter <committer@example.com>
+	Signed-off-by: C1 E1
+	Helped-by: C2 E2
+	Reported-by: C3 E3
+	Mentored-by: C4 E4
+	EOF
+	git cat-file commit HEAD >commit.msg &&
+	sed -e "1,/^\$/d" commit.msg >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'commit --trailer with -c and "replace" as ifexists' '
+	trailer_commit_base &&
+	cat >expected <<-\EOF &&
+	hello
+
+	Signed-off-by: C O Mitter <committer@example.com>
+	Signed-off-by: C1 E1
+	Reported-by: C3 E3
+	Mentored-by: C4 E4
+	Helped-by: C3 E3
+	EOF
+	git -c trailer.ifexists="replace" \
+		commit --trailer "Mentored-by: C4 E4" \
+		 --trailer "Helped-by: C3 E3" \
+		--amend &&
+	git cat-file commit HEAD >commit.msg &&
+	sed -e "1,/^\$/d"  commit.msg >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'commit --trailer with -c and "add" as ifexists' '
+	trailer_commit_base &&
+	cat >expected <<-\EOF &&
+	hello
+
+	Signed-off-by: C O Mitter <committer@example.com>
+	Signed-off-by: C1 E1
+	Helped-by: C2 E2
+	Reported-by: C3 E3
+	Mentored-by: C4 E4
+	Reported-by: C3 E3
+	Mentored-by: C4 E4
+	EOF
+	git -c trailer.ifexists="add" \
+		commit --trailer "Reported-by: C3 E3" \
+		--trailer "Mentored-by: C4 E4" \
+		--amend &&
+	git cat-file commit HEAD >commit.msg &&
+	sed -e "1,/^\$/d"  commit.msg >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'commit --trailer with -c and "donothing" as ifexists' '
+	trailer_commit_base &&
+	cat >expected <<-\EOF &&
+	hello
+
+	Signed-off-by: C O Mitter <committer@example.com>
+	Signed-off-by: C1 E1
+	Helped-by: C2 E2
+	Reported-by: C3 E3
+	Mentored-by: C4 E4
+	Reviewed-by: C6 E6
+	EOF
+	git -c trailer.ifexists="donothing" \
+		commit --trailer "Mentored-by: C5 E5" \
+		--trailer "Reviewed-by: C6 E6" \
+		--amend &&
+	git cat-file commit HEAD >commit.msg &&
+	sed -e "1,/^\$/d"  commit.msg >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'commit --trailer with -c and "addIfDifferent" as ifexists' '
+	trailer_commit_base &&
+	cat >expected <<-\EOF &&
+	hello
+
+	Signed-off-by: C O Mitter <committer@example.com>
+	Signed-off-by: C1 E1
+	Helped-by: C2 E2
+	Reported-by: C3 E3
+	Mentored-by: C4 E4
+	Mentored-by: C5 E5
+	EOF
+	git -c trailer.ifexists="addIfDifferent" \
+		commit --trailer "Reported-by: C3 E3" \
+		--trailer "Mentored-by: C5 E5" \
+		--amend &&
+	git cat-file commit HEAD >commit.msg &&
+	sed -e "1,/^\$/d"  commit.msg >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'commit --trailer with -c and "addIfDifferentNeighbor" as ifexists' '
+	trailer_commit_base &&
+	cat >expected <<-\EOF &&
+	hello
+
+	Signed-off-by: C O Mitter <committer@example.com>
+	Signed-off-by: C1 E1
+	Helped-by: C2 E2
+	Reported-by: C3 E3
+	Mentored-by: C4 E4
+	Reported-by: C3 E3
+	EOF
+	git -c trailer.ifexists="addIfDifferentNeighbor" \
+		commit --trailer "Mentored-by: C4 E4" \
+		--trailer "Reported-by: C3 E3" \
+		--amend &&
+	git cat-file commit HEAD >commit.msg &&
+	sed -e "1,/^\$/d"  commit.msg >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'commit --trailer with -c and "end" as where' '
+	trailer_commit_base &&
+	cat >expected <<-\EOF &&
+	hello
+
+	Signed-off-by: C O Mitter <committer@example.com>
+	Signed-off-by: C1 E1
+	Helped-by: C2 E2
+	Reported-by: C3 E3
+	Mentored-by: C4 E4
+	Reported-by: C3 E3
+	Mentored-by: C4 E4
+	EOF
+	git -c trailer.where="end" \
+		commit --trailer "Reported-by: C3 E3" \
+		--trailer "Mentored-by: C4 E4" \
+		--amend &&
+	git cat-file commit HEAD >commit.msg &&
+	sed -e "1,/^\$/d" commit.msg >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'commit --trailer with -c and "start" as where' '
+	trailer_commit_base &&
+	cat >expected <<-\EOF &&
+	hello
+
+	Signed-off-by: C1 E1
+	Signed-off-by: C O Mitter <committer@example.com>
+	Signed-off-by: C1 E1
+	Helped-by: C2 E2
+	Reported-by: C3 E3
+	Mentored-by: C4 E4
+	EOF
+	git -c trailer.where="start" \
+		commit --trailer "Signed-off-by: C O Mitter <committer@example.com>" \
+		--trailer "Signed-off-by: C1 E1" \
+		--amend &&
+	git cat-file commit HEAD >commit.msg &&
+	sed -e "1,/^\$/d" commit.msg >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'commit --trailer with -c and "after" as where' '
+	trailer_commit_base &&
+	cat >expected <<-\EOF &&
+	hello
+
+	Signed-off-by: C O Mitter <committer@example.com>
+	Signed-off-by: C1 E1
+	Helped-by: C2 E2
+	Reported-by: C3 E3
+	Mentored-by: C4 E4
+	Mentored-by: C5 E5
+	EOF
+	git -c trailer.where="after" \
+		commit --trailer "Mentored-by: C4 E4" \
+		--trailer "Mentored-by: C5 E5" \
+		--amend &&
+	git cat-file commit HEAD >commit.msg &&
+	sed -e "1,/^\$/d" commit.msg >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'commit --trailer with -c and "before" as where' '
+	trailer_commit_base &&
+	cat >expected <<-\EOF &&
+	hello
+
+	Signed-off-by: C O Mitter <committer@example.com>
+	Signed-off-by: C1 E1
+	Helped-by: C2 E2
+	Reported-by: C3 E3
+	Mentored-by: C2 E2
+	Mentored-by: C3 E3
+	Mentored-by: C4 E4
+	EOF
+	git -c trailer.where="before" \
+		commit --trailer "Mentored-by: C3 E3" \
+		--trailer "Mentored-by: C2 E2" \
+		--amend &&
+	git cat-file commit HEAD >commit.msg &&
+	sed -e "1,/^\$/d" commit.msg >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'commit --trailer with -c and "donothing" as ifmissing' '
+	trailer_commit_base &&
+	cat >expected <<-\EOF &&
+	hello
+
+	Signed-off-by: C O Mitter <committer@example.com>
+	Signed-off-by: C1 E1
+	Helped-by: C2 E2
+	Reported-by: C3 E3
+	Mentored-by: C4 E4
+	Helped-by: C5 E5
+	EOF
+	git -c trailer.ifmissing="donothing" \
+		commit --trailer "Helped-by: C5 E5" \
+		--trailer "Based-by: C6 E6" \
+		--amend &&
+	git cat-file commit HEAD >commit.msg &&
+	sed -e "1,/^\$/d" commit.msg >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'commit --trailer with -c and "add" as ifmissing' '
+	trailer_commit_base &&
+	cat >expected <<-\EOF &&
+	hello
+
+	Signed-off-by: C O Mitter <committer@example.com>
+	Signed-off-by: C1 E1
+	Helped-by: C2 E2
+	Reported-by: C3 E3
+	Mentored-by: C4 E4
+	Helped-by: C5 E5
+	Based-by: C6 E6
+	EOF
+	git -c trailer.ifmissing="add" \
+		commit --trailer "Helped-by: C5 E5" \
+		--trailer "Based-by: C6 E6" \
+		--amend &&
+	git cat-file commit HEAD >commit.msg &&
+	sed -e "1,/^\$/d" commit.msg >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'commit --trailer with -c ack.key ' '
+	echo "fun" >>file1 &&
+	git add file1 &&
+	cat >expected <<-\EOF &&
+		hello
+
+		Acked-by: Peff
+	EOF
+	git -c trailer.ack.key="Acked-by" \
+		commit --trailer "ack = Peff" -m "hello" &&
+	git cat-file commit HEAD >commit.msg &&
+	sed -e "1,/^\$/d" commit.msg >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'commit --trailer with -c and ":=#" as separators' '
+	echo "fun" >>file1 &&
+	git add file1 &&
+	cat >expected <<-\EOF &&
+		I hate bug
+
+		Bug #42
+	EOF
+	git -c trailer.separators=":=#" \
+		-c trailer.bug.key="Bug #" \
+		commit --trailer "bug = 42" -m "I hate bug" &&
+	git cat-file commit HEAD >commit.msg &&
+	sed -e "1,/^\$/d" commit.msg >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'commit --trailer with -c and command' '
+	trailer_commit_base &&
+	cat >expected <<-\EOF &&
+	hello
+
+	Signed-off-by: C O Mitter <committer@example.com>
+	Signed-off-by: C1 E1
+	Helped-by: C2 E2
+	Mentored-by: C4 E4
+	Reported-by: A U Thor <author@example.com>
+	EOF
+	git -c trailer.report.key="Reported-by: " \
+		-c trailer.report.ifexists="replace" \
+		-c trailer.report.command="NAME=\"\$ARG\"; test -n \"\$NAME\" && \
+		git log --author=\"\$NAME\" -1 --format=\"format:%aN <%aE>\" || true" \
+		commit --trailer "report = author" --amend &&
+	git cat-file commit HEAD >commit.msg &&
+	sed -e "1,/^\$/d" commit.msg >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'commit --trailer not confused by --- separator' '
+	cat >msg <<-\EOF &&
+	subject
+
+	body with dashes
+	---
+	in it
+	EOF
+	git commit --allow-empty --trailer="my-trailer: value" -F msg &&
+	{
+		cat msg &&
+		echo &&
+		echo "my-trailer: value"
+	} >expected &&
+	git cat-file commit HEAD >commit.msg &&
+	sed -e "1,/^\$/d" commit.msg >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'commit --trailer with --verbose' '
+	cat >msg <<-\EOF &&
+	subject
+
+	body
+	EOF
+	GIT_EDITOR=: git commit --edit -F msg --allow-empty \
+		--trailer="my-trailer: value" --verbose &&
+	{
+		cat msg &&
+		echo &&
+		echo "my-trailer: value"
+	} >expected &&
+	git cat-file commit HEAD >commit.msg &&
+	sed -e "1,/^\$/d" commit.msg >actual &&
+	test_cmp expected actual
+'
+
 test_expect_success 'multiple -m' '
 
 	>negative &&
@@ -297,7 +649,7 @@ echo "sample
 # with '#' will be ignored, and an empty message aborts the commit." >expect
 
 test_expect_success 'cleanup commit messages (strip option,-F,-e): output' '
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 test_expect_success 'cleanup commit message (fail on invalid cleanup mode option)' '
@@ -372,18 +724,23 @@ test_expect_success 'cleanup commit message (whitespace config, -m)' '
 test_expect_success 'message shows author when it is not equal to committer' '
 	echo >>negative &&
 	git commit -e -m "sample" -a &&
-	test_i18ngrep \
+	test_grep \
 	  "^# Author: *A U Thor <author@example.com>\$" \
 	  .git/COMMIT_EDITMSG
 '
 
 test_expect_success 'message shows date when it is explicitly set' '
 	git commit --allow-empty -e -m foo --date="2010-01-02T03:04:05" &&
-	test_i18ngrep \
+	test_grep \
 	  "^# Date: *Sat Jan 2 03:04:05 2010 +0000" \
 	  .git/COMMIT_EDITMSG
 '
 
+test_expect_success 'message does not have multiple scissors lines' '
+	git commit --cleanup=scissors -v --allow-empty -e -m foo &&
+	test $(grep -c -e "--- >8 ---" .git/COMMIT_EDITMSG) -eq 1
+'
+
 test_expect_success AUTOIDENT 'message shows committer when it is automatic' '
 
 	echo >>negative &&
@@ -394,7 +751,7 @@ test_expect_success AUTOIDENT 'message shows committer when it is automatic' '
 	) &&
 	# the ident is calculated from the system, so we cannot
 	# check the actual value, only that it is there
-	test_i18ngrep "^# Committer: " .git/COMMIT_EDITMSG
+	test_grep "^# Committer: " .git/COMMIT_EDITMSG
 '
 
 write_script .git/FAKE_EDITOR <<EOF
@@ -440,7 +797,7 @@ test_expect_success 'do not fire editor in the presence of conflicts' '
 	git add g &&
 	git commit -m "add g" &&
 	git branch second &&
-	echo master >g &&
+	echo main >g &&
 	echo g >h &&
 	git add g h &&
 	git commit -m "modify g and add h" &&
@@ -449,7 +806,7 @@ test_expect_success 'do not fire editor in the presence of conflicts' '
 	git add g &&
 	git commit -m second &&
 	# Must fail due to conflict
-	test_must_fail git cherry-pick -n master &&
+	test_must_fail git cherry-pick -n main &&
 	echo "editor not started" >.git/result &&
 	(
 		GIT_EDITOR="\"$(pwd)/.git/FAKE_EDITOR\"" &&
@@ -478,9 +835,9 @@ git reset -q --hard
 
 test_expect_success 'Hand committing of a redundant merge removes dups' '
 
-	git rev-parse second master >expect &&
-	test_must_fail git merge second master &&
-	git checkout master g &&
+	git rev-parse second main >expect &&
+	test_must_fail git merge second main &&
+	git checkout main g &&
 	EDITOR=: git commit -a &&
 	git cat-file commit HEAD >raw &&
 	sed -n -e "s/^parent //p" -e "/^$/q" raw >actual &&
@@ -526,9 +883,9 @@ try_commit () {
 	GIT_EDITOR=.git/FAKE_EDITOR git commit -a $* $use_template &&
 	case "$use_template" in
 	'')
-		test_i18ngrep ! "^## Custom template" .git/COMMIT_EDITMSG ;;
+		test_grep ! "^## Custom template" .git/COMMIT_EDITMSG ;;
 	*)
-		test_i18ngrep "^## Custom template" .git/COMMIT_EDITMSG ;;
+		test_grep "^## Custom template" .git/COMMIT_EDITMSG ;;
 	esac
 }
 
@@ -536,53 +893,53 @@ try_commit_status_combo () {
 
 	test_expect_success 'commit' '
 		try_commit "" &&
-		test_i18ngrep "^# Changes to be committed:" .git/COMMIT_EDITMSG
+		test_grep "^# Changes to be committed:" .git/COMMIT_EDITMSG
 	'
 
 	test_expect_success 'commit --status' '
 		try_commit --status &&
-		test_i18ngrep "^# Changes to be committed:" .git/COMMIT_EDITMSG
+		test_grep "^# Changes to be committed:" .git/COMMIT_EDITMSG
 	'
 
 	test_expect_success 'commit --no-status' '
 		try_commit --no-status &&
-		test_i18ngrep ! "^# Changes to be committed:" .git/COMMIT_EDITMSG
+		test_grep ! "^# Changes to be committed:" .git/COMMIT_EDITMSG
 	'
 
 	test_expect_success 'commit with commit.status = yes' '
 		test_config commit.status yes &&
 		try_commit "" &&
-		test_i18ngrep "^# Changes to be committed:" .git/COMMIT_EDITMSG
+		test_grep "^# Changes to be committed:" .git/COMMIT_EDITMSG
 	'
 
 	test_expect_success 'commit with commit.status = no' '
 		test_config commit.status no &&
 		try_commit "" &&
-		test_i18ngrep ! "^# Changes to be committed:" .git/COMMIT_EDITMSG
+		test_grep ! "^# Changes to be committed:" .git/COMMIT_EDITMSG
 	'
 
 	test_expect_success 'commit --status with commit.status = yes' '
 		test_config commit.status yes &&
 		try_commit --status &&
-		test_i18ngrep "^# Changes to be committed:" .git/COMMIT_EDITMSG
+		test_grep "^# Changes to be committed:" .git/COMMIT_EDITMSG
 	'
 
 	test_expect_success 'commit --no-status with commit.status = yes' '
 		test_config commit.status yes &&
 		try_commit --no-status &&
-		test_i18ngrep ! "^# Changes to be committed:" .git/COMMIT_EDITMSG
+		test_grep ! "^# Changes to be committed:" .git/COMMIT_EDITMSG
 	'
 
 	test_expect_success 'commit --status with commit.status = no' '
 		test_config commit.status no &&
 		try_commit --status &&
-		test_i18ngrep "^# Changes to be committed:" .git/COMMIT_EDITMSG
+		test_grep "^# Changes to be committed:" .git/COMMIT_EDITMSG
 	'
 
 	test_expect_success 'commit --no-status with commit.status = no' '
 		test_config commit.status no &&
 		try_commit --no-status &&
-		test_i18ngrep ! "^# Changes to be committed:" .git/COMMIT_EDITMSG
+		test_grep ! "^# Changes to be committed:" .git/COMMIT_EDITMSG
 	'
 
 }
@@ -596,13 +953,13 @@ try_commit_status_combo
 test_expect_success 'commit --status with custom comment character' '
 	test_config core.commentchar ";" &&
 	try_commit --status &&
-	test_i18ngrep "^; Changes to be committed:" .git/COMMIT_EDITMSG
+	test_grep "^; Changes to be committed:" .git/COMMIT_EDITMSG
 '
 
 test_expect_success 'switch core.commentchar' '
 	test_commit "#foo" foo &&
 	GIT_EDITOR=.git/FAKE_EDITOR git -c core.commentChar=auto commit --amend &&
-	test_i18ngrep "^; Changes to be committed:" .git/COMMIT_EDITMSG
+	test_grep "^; Changes to be committed:" .git/COMMIT_EDITMSG
 '
 
 test_expect_success 'switch core.commentchar but out of options' '
diff --git a/t/t7503-pre-commit-and-pre-merge-commit-hooks.sh b/t/t7503-pre-commit-and-pre-merge-commit-hooks.sh
index b348545..aa004b7 100755
--- a/t/t7503-pre-commit-and-pre-merge-commit-hooks.sh
+++ b/t/t7503-pre-commit-and-pre-merge-commit-hooks.sh
@@ -2,38 +2,11 @@
 
 test_description='pre-commit and pre-merge-commit hooks'
 
-. ./test-lib.sh
-
-HOOKDIR="$(git rev-parse --git-dir)/hooks"
-PRECOMMIT="$HOOKDIR/pre-commit"
-PREMERGE="$HOOKDIR/pre-merge-commit"
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
-# Prepare sample scripts that write their $0 to actual_hooks
-test_expect_success 'sample script setup' '
-	mkdir -p "$HOOKDIR" &&
-	write_script "$HOOKDIR/success.sample" <<-\EOF &&
-	echo $0 >>actual_hooks
-	exit 0
-	EOF
-	write_script "$HOOKDIR/fail.sample" <<-\EOF &&
-	echo $0 >>actual_hooks
-	exit 1
-	EOF
-	write_script "$HOOKDIR/non-exec.sample" <<-\EOF &&
-	echo $0 >>actual_hooks
-	exit 1
-	EOF
-	chmod -x "$HOOKDIR/non-exec.sample" &&
-	write_script "$HOOKDIR/require-prefix.sample" <<-\EOF &&
-	echo $0 >>actual_hooks
-	test $GIT_PREFIX = "success/"
-	EOF
-	write_script "$HOOKDIR/check-author.sample" <<-\EOF
-	echo $0 >>actual_hooks
-	test "$GIT_AUTHOR_NAME" = "New Author" &&
-	test "$GIT_AUTHOR_EMAIL" = "newauthor@example.com"
-	EOF
-'
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
 
 test_expect_success 'root commit' '
 	echo "root" >file &&
@@ -44,16 +17,16 @@ test_expect_success 'root commit' '
 	git add foo &&
 	git commit -m "make it non-ff" &&
 	git branch side-orig side &&
-	git checkout master
+	git checkout main
 '
 
 test_expect_success 'setup conflicting branches' '
-	test_when_finished "git checkout master" &&
-	git checkout -b conflicting-a master &&
+	test_when_finished "git checkout main" &&
+	git checkout -b conflicting-a main &&
 	echo a >conflicting &&
 	git add conflicting &&
 	git commit -m conflicting-a &&
-	git checkout -b conflicting-b master &&
+	git checkout -b conflicting-b main &&
 	echo b >conflicting &&
 	git add conflicting &&
 	git commit -m conflicting-b
@@ -71,8 +44,8 @@ test_expect_success 'with no hook (merge)' '
 	test_when_finished "rm -f actual_hooks" &&
 	git branch -f side side-orig &&
 	git checkout side &&
-	git merge -m "merge master" master &&
-	git checkout master &&
+	git merge -m "merge main" main &&
+	git checkout main &&
 	test_path_is_missing actual_hooks
 '
 
@@ -88,15 +61,21 @@ test_expect_success '--no-verify with no hook (merge)' '
 	test_when_finished "rm -f actual_hooks" &&
 	git branch -f side side-orig &&
 	git checkout side &&
-	git merge --no-verify -m "merge master" master &&
-	git checkout master &&
+	git merge --no-verify -m "merge main" main &&
+	git checkout main &&
 	test_path_is_missing actual_hooks
 '
 
+setup_success_hook () {
+	test_when_finished "rm -f actual_hooks expected_hooks" &&
+	echo "$1" >expected_hooks &&
+	test_hook "$1" <<-EOF
+	echo $1 >>actual_hooks
+	EOF
+}
+
 test_expect_success 'with succeeding hook' '
-	test_when_finished "rm -f \"$PRECOMMIT\" expected_hooks actual_hooks" &&
-	cp "$HOOKDIR/success.sample" "$PRECOMMIT" &&
-	echo "$PRECOMMIT" >expected_hooks &&
+	setup_success_hook "pre-commit" &&
 	echo "more" >>file &&
 	git add file &&
 	git commit -m "more" &&
@@ -104,27 +83,22 @@ test_expect_success 'with succeeding hook' '
 '
 
 test_expect_success 'with succeeding hook (merge)' '
-	test_when_finished "rm -f \"$PREMERGE\" expected_hooks actual_hooks" &&
-	cp "$HOOKDIR/success.sample" "$PREMERGE" &&
-	echo "$PREMERGE" >expected_hooks &&
+	setup_success_hook "pre-merge-commit" &&
 	git checkout side &&
-	git merge -m "merge master" master &&
-	git checkout master &&
+	git merge -m "merge main" main &&
+	git checkout main &&
 	test_cmp expected_hooks actual_hooks
 '
 
 test_expect_success 'automatic merge fails; both hooks are available' '
-	test_when_finished "rm -f \"$PREMERGE\" \"$PRECOMMIT\"" &&
-	test_when_finished "rm -f expected_hooks actual_hooks" &&
-	test_when_finished "git checkout master" &&
-	cp "$HOOKDIR/success.sample" "$PREMERGE" &&
-	cp "$HOOKDIR/success.sample" "$PRECOMMIT" &&
+	setup_success_hook "pre-commit" &&
+	setup_success_hook "pre-merge-commit" &&
 
 	git checkout conflicting-a &&
 	test_must_fail git merge -m "merge conflicting-b" conflicting-b &&
 	test_path_is_missing actual_hooks &&
 
-	echo "$PRECOMMIT" >expected_hooks &&
+	echo "pre-commit" >expected_hooks &&
 	echo a+b >conflicting &&
 	git add conflicting &&
 	git commit -m "resolve conflict" &&
@@ -132,8 +106,7 @@ test_expect_success 'automatic merge fails; both hooks are available' '
 '
 
 test_expect_success '--no-verify with succeeding hook' '
-	test_when_finished "rm -f \"$PRECOMMIT\" actual_hooks" &&
-	cp "$HOOKDIR/success.sample" "$PRECOMMIT" &&
+	setup_success_hook "pre-commit" &&
 	echo "even more" >>file &&
 	git add file &&
 	git commit --no-verify -m "even more" &&
@@ -141,19 +114,27 @@ test_expect_success '--no-verify with succeeding hook' '
 '
 
 test_expect_success '--no-verify with succeeding hook (merge)' '
-	test_when_finished "rm -f \"$PREMERGE\" actual_hooks" &&
-	cp "$HOOKDIR/success.sample" "$PREMERGE" &&
+	setup_success_hook "pre-merge-commit" &&
 	git branch -f side side-orig &&
 	git checkout side &&
-	git merge --no-verify -m "merge master" master &&
-	git checkout master &&
+	git merge --no-verify -m "merge main" main &&
+	git checkout main &&
 	test_path_is_missing actual_hooks
 '
 
+setup_failing_hook () {
+	test_when_finished "rm -f actual_hooks" &&
+	test_hook "$1" <<-EOF
+	echo $1-failing-hook >>actual_hooks
+	exit 1
+	EOF
+}
+
 test_expect_success 'with failing hook' '
-	test_when_finished "rm -f \"$PRECOMMIT\" expected_hooks actual_hooks" &&
-	cp "$HOOKDIR/fail.sample" "$PRECOMMIT" &&
-	echo "$PRECOMMIT" >expected_hooks &&
+	setup_failing_hook "pre-commit" &&
+	test_when_finished "rm -f expected_hooks" &&
+	echo "pre-commit-failing-hook" >expected_hooks &&
+
 	echo "another" >>file &&
 	git add file &&
 	test_must_fail git commit -m "another" &&
@@ -161,8 +142,7 @@ test_expect_success 'with failing hook' '
 '
 
 test_expect_success '--no-verify with failing hook' '
-	test_when_finished "rm -f \"$PRECOMMIT\" actual_hooks" &&
-	cp "$HOOKDIR/fail.sample" "$PRECOMMIT" &&
+	setup_failing_hook "pre-commit" &&
 	echo "stuff" >>file &&
 	git add file &&
 	git commit --no-verify -m "stuff" &&
@@ -170,28 +150,36 @@ test_expect_success '--no-verify with failing hook' '
 '
 
 test_expect_success 'with failing hook (merge)' '
-	test_when_finished "rm -f \"$PREMERGE\" expected_hooks actual_hooks" &&
-	cp "$HOOKDIR/fail.sample" "$PREMERGE" &&
-	echo "$PREMERGE" >expected_hooks &&
+	setup_failing_hook "pre-merge-commit" &&
+	echo "pre-merge-commit-failing-hook" >expected_hooks &&
 	git checkout side &&
-	test_must_fail git merge -m "merge master" master &&
-	git checkout master &&
+	test_must_fail git merge -m "merge main" main &&
+	git checkout main &&
 	test_cmp expected_hooks actual_hooks
 '
 
 test_expect_success '--no-verify with failing hook (merge)' '
-	test_when_finished "rm -f \"$PREMERGE\" actual_hooks" &&
-	cp "$HOOKDIR/fail.sample" "$PREMERGE" &&
+	setup_failing_hook "pre-merge-commit" &&
+
 	git branch -f side side-orig &&
 	git checkout side &&
-	git merge --no-verify -m "merge master" master &&
-	git checkout master &&
+	git merge --no-verify -m "merge main" main &&
+	git checkout main &&
 	test_path_is_missing actual_hooks
 '
 
+setup_non_exec_hook () {
+	test_when_finished "rm -f actual_hooks" &&
+	test_hook "$1" <<-\EOF &&
+	echo non-exec >>actual_hooks
+	exit 1
+	EOF
+	test_hook --disable "$1"
+}
+
+
 test_expect_success POSIXPERM 'with non-executable hook' '
-	test_when_finished "rm -f \"$PRECOMMIT\" actual_hooks" &&
-	cp "$HOOKDIR/non-exec.sample" "$PRECOMMIT" &&
+	setup_non_exec_hook "pre-commit" &&
 	echo "content" >>file &&
 	git add file &&
 	git commit -m "content" &&
@@ -199,8 +187,7 @@ test_expect_success POSIXPERM 'with non-executable hook' '
 '
 
 test_expect_success POSIXPERM '--no-verify with non-executable hook' '
-	test_when_finished "rm -f \"$PRECOMMIT\" actual_hooks" &&
-	cp "$HOOKDIR/non-exec.sample" "$PRECOMMIT" &&
+	setup_non_exec_hook "pre-commit" &&
 	echo "more content" >>file &&
 	git add file &&
 	git commit --no-verify -m "more content" &&
@@ -208,29 +195,35 @@ test_expect_success POSIXPERM '--no-verify with non-executable hook' '
 '
 
 test_expect_success POSIXPERM 'with non-executable hook (merge)' '
-	test_when_finished "rm -f \"$PREMERGE\" actual_hooks" &&
-	cp "$HOOKDIR/non-exec.sample" "$PREMERGE" &&
+	setup_non_exec_hook "pre-merge" &&
 	git branch -f side side-orig &&
 	git checkout side &&
-	git merge -m "merge master" master &&
-	git checkout master &&
+	git merge -m "merge main" main &&
+	git checkout main &&
 	test_path_is_missing actual_hooks
 '
 
 test_expect_success POSIXPERM '--no-verify with non-executable hook (merge)' '
-	test_when_finished "rm -f \"$PREMERGE\" actual_hooks" &&
-	cp "$HOOKDIR/non-exec.sample" "$PREMERGE" &&
+	setup_non_exec_hook "pre-merge" &&
 	git branch -f side side-orig &&
 	git checkout side &&
-	git merge --no-verify -m "merge master" master &&
-	git checkout master &&
+	git merge --no-verify -m "merge main" main &&
+	git checkout main &&
 	test_path_is_missing actual_hooks
 '
 
+setup_require_prefix_hook () {
+	test_when_finished "rm -f expected_hooks" &&
+	echo require-prefix >expected_hooks &&
+	test_hook pre-commit <<-\EOF
+	echo require-prefix >>actual_hooks
+	test $GIT_PREFIX = "success/"
+	EOF
+}
+
 test_expect_success 'with hook requiring GIT_PREFIX' '
-	test_when_finished "rm -rf \"$PRECOMMIT\" expected_hooks actual_hooks success" &&
-	cp "$HOOKDIR/require-prefix.sample" "$PRECOMMIT" &&
-	echo "$PRECOMMIT" >expected_hooks &&
+	test_when_finished "rm -rf actual_hooks success" &&
+	setup_require_prefix_hook &&
 	echo "more content" >>file &&
 	git add file &&
 	mkdir success &&
@@ -242,9 +235,8 @@ test_expect_success 'with hook requiring GIT_PREFIX' '
 '
 
 test_expect_success 'with failing hook requiring GIT_PREFIX' '
-	test_when_finished "rm -rf \"$PRECOMMIT\" expected_hooks actual_hooks fail" &&
-	cp "$HOOKDIR/require-prefix.sample" "$PRECOMMIT" &&
-	echo "$PRECOMMIT" >expected_hooks &&
+	test_when_finished "rm -rf actual_hooks fail" &&
+	setup_require_prefix_hook &&
 	echo "more content" >>file &&
 	git add file &&
 	mkdir fail &&
@@ -256,13 +248,23 @@ test_expect_success 'with failing hook requiring GIT_PREFIX' '
 	test_cmp expected_hooks actual_hooks
 '
 
+setup_require_author_hook () {
+	test_when_finished "rm -f expected_hooks actual_hooks" &&
+	echo check-author >expected_hooks &&
+	test_hook pre-commit <<-\EOF
+	echo check-author >>actual_hooks
+	test "$GIT_AUTHOR_NAME" = "New Author" &&
+	test "$GIT_AUTHOR_EMAIL" = "newauthor@example.com"
+	EOF
+}
+
+
 test_expect_success 'check the author in hook' '
-	test_when_finished "rm -f \"$PRECOMMIT\" expected_hooks actual_hooks" &&
-	cp "$HOOKDIR/check-author.sample" "$PRECOMMIT" &&
+	setup_require_author_hook &&
 	cat >expected_hooks <<-EOF &&
-	$PRECOMMIT
-	$PRECOMMIT
-	$PRECOMMIT
+	check-author
+	check-author
+	check-author
 	EOF
 	test_must_fail git commit --allow-empty -m "by a.u.thor" &&
 	(
diff --git a/t/t7504-commit-msg-hook.sh b/t/t7504-commit-msg-hook.sh
index 31b9c6a..d125522 100755
--- a/t/t7504-commit-msg-hook.sh
+++ b/t/t7504-commit-msg-hook.sh
@@ -2,6 +2,10 @@
 
 test_description='commit-msg hook'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'with no hook' '
@@ -51,15 +55,11 @@ test_expect_success '--no-verify with no hook (editor)' '
 
 '
 
-# now install hook that always succeeds
-HOOKDIR="$(git rev-parse --git-dir)/hooks"
-HOOK="$HOOKDIR/commit-msg"
-mkdir -p "$HOOKDIR"
-cat > "$HOOK" <<EOF
-#!/bin/sh
-exit 0
-EOF
-chmod +x "$HOOK"
+test_expect_success 'setup: commit-msg hook that always succeeds' '
+	test_hook --setup commit-msg <<-\EOF
+	exit 0
+	EOF
+'
 
 test_expect_success 'with succeeding hook' '
 
@@ -95,14 +95,16 @@ test_expect_success '--no-verify with succeeding hook (editor)' '
 
 '
 
-# now a hook that fails
-cat > "$HOOK" <<EOF
-#!/bin/sh
-exit 1
-EOF
+test_expect_success 'setup: commit-msg hook that always fails' '
+	test_hook --clobber commit-msg <<-\EOF
+	exit 1
+	EOF
+'
 
 commit_msg_is () {
-	test "$(git log --pretty=format:%s%b -1)" = "$1"
+	printf "%s" "$1" >expect &&
+	git log --pretty=format:%s%b -1 >actual &&
+	test_cmp expect actual
 }
 
 test_expect_success 'with failing hook' '
@@ -130,6 +132,14 @@ test_expect_success '--no-verify with failing hook' '
 
 '
 
+test_expect_success '-n followed by --verify with failing hook' '
+
+	echo "even more" >> file &&
+	git add file &&
+	test_must_fail git commit -n --verify -m "even more"
+
+'
+
 test_expect_success '--no-verify with failing hook (editor)' '
 
 	echo "more stuff" >> file &&
@@ -142,12 +152,12 @@ test_expect_success '--no-verify with failing hook (editor)' '
 test_expect_success 'merge fails with failing hook' '
 
 	test_when_finished "git branch -D newbranch" &&
-	test_when_finished "git checkout -f master" &&
+	test_when_finished "git checkout -f main" &&
 	git checkout --orphan newbranch &&
 	: >file2 &&
 	git add file2 &&
 	git commit --no-verify file2 -m in-side-branch &&
-	test_must_fail git merge --allow-unrelated-histories master &&
+	test_must_fail git merge --allow-unrelated-histories main &&
 	commit_msg_is "in-side-branch" # HEAD before merge
 
 '
@@ -155,18 +165,22 @@ test_expect_success 'merge fails with failing hook' '
 test_expect_success 'merge bypasses failing hook with --no-verify' '
 
 	test_when_finished "git branch -D newbranch" &&
-	test_when_finished "git checkout -f master" &&
+	test_when_finished "git checkout -f main" &&
 	git checkout --orphan newbranch &&
 	git rm -f file &&
 	: >file2 &&
 	git add file2 &&
 	git commit --no-verify file2 -m in-side-branch &&
-	git merge --no-verify --allow-unrelated-histories master &&
-	commit_msg_is "Merge branch '\''master'\'' into newbranch"
+	git merge --no-verify --allow-unrelated-histories main &&
+	commit_msg_is "Merge branch '\''main'\'' into newbranch"
+'
+
+test_expect_success 'setup: commit-msg hook made non-executable' '
+	git_dir="$(git rev-parse --git-dir)" &&
+	chmod -x "$git_dir/hooks/commit-msg"
 '
 
 
-chmod -x "$HOOK"
 test_expect_success POSIXPERM 'with non-executable hook' '
 
 	echo "content" >file &&
@@ -201,13 +215,12 @@ test_expect_success POSIXPERM '--no-verify with non-executable hook (editor)' '
 
 '
 
-# now a hook that edits the commit message
-cat > "$HOOK" <<'EOF'
-#!/bin/sh
-echo "new message" > "$1"
-exit 0
-EOF
-chmod +x "$HOOK"
+test_expect_success 'setup: commit-msg hook that edits the commit message' '
+	test_hook --clobber commit-msg <<-\EOF
+	echo "new message" >"$1"
+	exit 0
+	EOF
+'
 
 test_expect_success 'hook edits commit message' '
 
@@ -248,28 +261,28 @@ test_expect_success "hook doesn't edit commit message (editor)" '
 
 test_expect_success 'hook called in git-merge picks up commit message' '
 	test_when_finished "git branch -D newbranch" &&
-	test_when_finished "git checkout -f master" &&
+	test_when_finished "git checkout -f main" &&
 	git checkout --orphan newbranch &&
 	git rm -f file &&
 	: >file2 &&
 	git add file2 &&
 	git commit --no-verify file2 -m in-side-branch &&
-	git merge --allow-unrelated-histories master &&
+	git merge --allow-unrelated-histories main &&
 	commit_msg_is "new message"
 '
 
 test_expect_failure 'merge --continue remembers --no-verify' '
 	test_when_finished "git branch -D newbranch" &&
-	test_when_finished "git checkout -f master" &&
-	git checkout master &&
+	test_when_finished "git checkout -f main" &&
+	git checkout main &&
 	echo a >file2 &&
 	git add file2 &&
-	git commit --no-verify -m "add file2 to master" &&
-	git checkout -b newbranch master^ &&
+	git commit --no-verify -m "add file2 to main" &&
+	git checkout -b newbranch main^ &&
 	echo b >file2 &&
 	git add file2 &&
 	git commit --no-verify file2 -m in-side-branch &&
-	git merge --no-verify -m not-rewritten-by-hook master &&
+	git merge --no-verify -m not-rewritten-by-hook main &&
 	# resolve conflict:
 	echo c >file2 &&
 	git add file2 &&
diff --git a/t/t7505-prepare-commit-msg-hook.sh b/t/t7505-prepare-commit-msg-hook.sh
index 94f85cd..2128142 100755
--- a/t/t7505-prepare-commit-msg-hook.sh
+++ b/t/t7505-prepare-commit-msg-hook.sh
@@ -2,6 +2,9 @@
 
 test_description='prepare-commit-msg hook'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 test_expect_success 'set up commits for rebasing' '
@@ -13,9 +16,9 @@ test_expect_success 'set up commits for rebasing' '
 	test_commit rebase-b b bb &&
 	for i in $(test_seq 1 13)
 	do
-		test_commit rebase-$i c $i
+		test_commit rebase-$i c $i || return 1
 	done &&
-	git checkout master &&
+	git checkout main &&
 
 	cat >rebase-todo <<-EOF
 	pick $(git rev-parse rebase-a)
@@ -44,25 +47,19 @@ test_expect_success 'with no hook' '
 
 '
 
-# set up fake editor for interactive editing
-cat > fake-editor <<'EOF'
-#!/bin/sh
-exit 0
-EOF
-chmod +x fake-editor
-
-## Not using test_set_editor here so we can easily ensure the editor variable
-## is only set for the editor tests
-FAKE_EDITOR="$(pwd)/fake-editor"
-export FAKE_EDITOR
+test_expect_success 'setup fake editor for interactive editing' '
+	write_script fake-editor <<-\EOF &&
+	exit 0
+	EOF
 
-# now install hook that always succeeds and adds a message
-HOOKDIR="$(git rev-parse --git-dir)/hooks"
-HOOK="$HOOKDIR/prepare-commit-msg"
-mkdir -p "$HOOKDIR"
-echo "#!$SHELL_PATH" > "$HOOK"
-cat >> "$HOOK" <<'EOF'
+	## Not using test_set_editor here so we can easily ensure the editor variable
+	## is only set for the editor tests
+	FAKE_EDITOR="$(pwd)/fake-editor" &&
+	export FAKE_EDITOR
+'
 
+test_expect_success 'setup prepare-commit-msg hook' '
+	test_hook --setup prepare-commit-msg <<\EOF
 GIT_DIR=$(git rev-parse --git-dir)
 if test -d "$GIT_DIR/rebase-merge"
 then
@@ -100,7 +97,7 @@ else
 fi
 exit 0
 EOF
-chmod +x "$HOOK"
+'
 
 echo dummy template > "$(git rev-parse --git-dir)/template"
 
@@ -190,7 +187,7 @@ test_expect_success 'with hook (-c)' '
 
 test_expect_success 'with hook (merge)' '
 
-	test_when_finished "git checkout -f master" &&
+	test_when_finished "git checkout -f main" &&
 	git checkout -B other HEAD@{1} &&
 	echo "more" >>file &&
 	git add file &&
@@ -202,7 +199,7 @@ test_expect_success 'with hook (merge)' '
 
 test_expect_success 'with hook and editor (merge)' '
 
-	test_when_finished "git checkout -f master" &&
+	test_when_finished "git checkout -f main" &&
 	git checkout -B other HEAD@{1} &&
 	echo "more" >>file &&
 	git add file &&
@@ -215,10 +212,10 @@ test_expect_success 'with hook and editor (merge)' '
 test_rebase () {
 	expect=$1 &&
 	mode=$2 &&
-	test_expect_$expect C_LOCALE_OUTPUT "with hook (rebase ${mode:--i})" '
+	test_expect_$expect "with hook (rebase ${mode:--i})" '
 		test_when_finished "\
 			git rebase --abort
-			git checkout -f master
+			git checkout -f main
 			git branch -D tmp" &&
 		git checkout -b tmp rebase-me &&
 		GIT_SEQUENCE_EDITOR="cp rebase-todo" &&
@@ -247,30 +244,30 @@ test_rebase () {
 }
 
 test_rebase success
-test_have_prereq !REBASE_P || test_rebase success -p
 
 test_expect_success 'with hook (cherry-pick)' '
-	test_when_finished "git checkout -f master" &&
+	test_when_finished "git checkout -f main" &&
 	git checkout -B other b &&
 	git cherry-pick rebase-1 &&
 	test "$(git log -1 --pretty=format:%s)" = "message (no editor)"
 '
 
 test_expect_success 'with hook and editor (cherry-pick)' '
-	test_when_finished "git checkout -f master" &&
+	test_when_finished "git checkout -f main" &&
 	git checkout -B other b &&
 	git cherry-pick -e rebase-1 &&
 	test "$(git log -1 --pretty=format:%s)" = merge
 '
 
-cat > "$HOOK" <<'EOF'
-#!/bin/sh
-exit 1
-EOF
+test_expect_success 'setup: commit-msg hook that always fails' '
+	test_hook --setup --clobber prepare-commit-msg <<-\EOF
+	exit 1
+	EOF
+'
 
 test_expect_success 'with failing hook' '
 
-	test_when_finished "git checkout -f master" &&
+	test_when_finished "git checkout -f main" &&
 	head=$(git rev-parse HEAD) &&
 	echo "more" >> file &&
 	git add file &&
@@ -280,7 +277,7 @@ test_expect_success 'with failing hook' '
 
 test_expect_success 'with failing hook (--no-verify)' '
 
-	test_when_finished "git checkout -f master" &&
+	test_when_finished "git checkout -f main" &&
 	head=$(git rev-parse HEAD) &&
 	echo "more" >> file &&
 	git add file &&
@@ -290,13 +287,13 @@ test_expect_success 'with failing hook (--no-verify)' '
 
 test_expect_success 'with failing hook (merge)' '
 
-	test_when_finished "git checkout -f master" &&
+	test_when_finished "git checkout -f main" &&
 	git checkout -B other HEAD@{1} &&
 	echo "more" >> file &&
 	git add file &&
-	rm -f "$HOOK" &&
+	test_hook --remove prepare-commit-msg &&
 	git commit -m other &&
-	write_script "$HOOK" <<-EOF &&
+	test_hook --setup prepare-commit-msg <<-\EOF &&
 	exit 1
 	EOF
 	git checkout - &&
@@ -304,8 +301,8 @@ test_expect_success 'with failing hook (merge)' '
 
 '
 
-test_expect_success C_LOCALE_OUTPUT 'with failing hook (cherry-pick)' '
-	test_when_finished "git checkout -f master" &&
+test_expect_success 'with failing hook (cherry-pick)' '
+	test_when_finished "git checkout -f main" &&
 	git checkout -B other b &&
 	test_must_fail git cherry-pick rebase-1 2>actual &&
 	test $(grep -c prepare-commit-msg actual) = 1
diff --git a/t/t7506-status-submodule.sh b/t/t7506-status-submodule.sh
index 3fcb447..46566d5 100755
--- a/t/t7506-status-submodule.sh
+++ b/t/t7506-status-submodule.sh
@@ -2,6 +2,7 @@
 
 test_description='git status for submodule'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_create_repo_with_commit () {
@@ -36,19 +37,19 @@ test_expect_success 'setup' '
 
 test_expect_success 'status clean' '
 	git status >output &&
-	test_i18ngrep "nothing to commit" output
+	test_grep "nothing to commit" output
 '
 
 test_expect_success 'commit --dry-run -a clean' '
 	test_must_fail git commit --dry-run -a >output &&
-	test_i18ngrep "nothing to commit" output
+	test_grep "nothing to commit" output
 '
 
 test_expect_success 'status with modified file in submodule' '
 	(cd sub && git reset --hard) &&
 	echo "changed" >sub/foo &&
 	git status >output &&
-	test_i18ngrep "modified:   sub (modified content)" output
+	test_grep "modified:   sub (modified content)" output
 '
 
 test_expect_success 'status with modified file in submodule (porcelain)' '
@@ -72,7 +73,7 @@ test_expect_success 'status with modified file in submodule (short)' '
 test_expect_success 'status with added file in submodule' '
 	(cd sub && git reset --hard && echo >foo && git add foo) &&
 	git status >output &&
-	test_i18ngrep "modified:   sub (modified content)" output
+	test_grep "modified:   sub (modified content)" output
 '
 
 test_expect_success 'status with added file in submodule (porcelain)' '
@@ -95,12 +96,12 @@ test_expect_success 'status with untracked file in submodule' '
 	(cd sub && git reset --hard) &&
 	echo "content" >sub/new-file &&
 	git status >output &&
-	test_i18ngrep "modified:   sub (untracked content)" output
+	test_grep "modified:   sub (untracked content)" output
 '
 
 test_expect_success 'status -uno with untracked file in submodule' '
 	git status -uno >output &&
-	test_i18ngrep "^nothing to commit" output
+	test_grep "^nothing to commit" output
 '
 
 test_expect_success 'status with untracked file in submodule (porcelain)' '
@@ -121,7 +122,7 @@ test_expect_success 'status with added and untracked file in submodule' '
 	(cd sub && git reset --hard && echo >foo && git add foo) &&
 	echo "content" >sub/new-file &&
 	git status >output &&
-	test_i18ngrep "modified:   sub (modified content, untracked content)" output
+	test_grep "modified:   sub (modified content, untracked content)" output
 '
 
 test_expect_success 'status with added and untracked file in submodule (porcelain)' '
@@ -139,7 +140,7 @@ test_expect_success 'status with modified file in modified submodule' '
 	(cd sub && echo "next change" >foo && git commit -m "next change" foo) &&
 	echo "changed" >sub/foo &&
 	git status >output &&
-	test_i18ngrep "modified:   sub (new commits, modified content)" output
+	test_grep "modified:   sub (new commits, modified content)" output
 '
 
 test_expect_success 'status with modified file in modified submodule (porcelain)' '
@@ -154,7 +155,7 @@ test_expect_success 'status with modified file in modified submodule (porcelain)
 test_expect_success 'status with added file in modified submodule' '
 	(cd sub && git reset --hard && echo >foo && git add foo) &&
 	git status >output &&
-	test_i18ngrep "modified:   sub (new commits, modified content)" output
+	test_grep "modified:   sub (new commits, modified content)" output
 '
 
 test_expect_success 'status with added file in modified submodule (porcelain)' '
@@ -169,7 +170,7 @@ test_expect_success 'status with untracked file in modified submodule' '
 	(cd sub && git reset --hard) &&
 	echo "content" >sub/new-file &&
 	git status >output &&
-	test_i18ngrep "modified:   sub (new commits, untracked content)" output
+	test_grep "modified:   sub (new commits, untracked content)" output
 '
 
 test_expect_success 'status with untracked file in modified submodule (porcelain)' '
@@ -183,7 +184,7 @@ test_expect_success 'status with added and untracked file in modified submodule'
 	(cd sub && git reset --hard && echo >foo && git add foo) &&
 	echo "content" >sub/new-file &&
 	git status >output &&
-	test_i18ngrep "modified:   sub (new commits, modified content, untracked content)" output
+	test_grep "modified:   sub (new commits, modified content, untracked content)" output
 '
 
 test_expect_success 'status with added and untracked file in modified submodule (porcelain)' '
@@ -208,7 +209,7 @@ test_expect_success 'setup .git file for sub' '
 test_expect_success 'status with added file in modified submodule with .git file' '
 	(cd sub && git reset --hard && echo >foo && git add foo) &&
 	git status >output &&
-	test_i18ngrep "modified:   sub (new commits, modified content)" output
+	test_grep "modified:   sub (new commits, modified content)" output
 '
 
 test_expect_success 'status with a lot of untracked files in the submodule' '
@@ -233,12 +234,12 @@ test_expect_success 'rm submodule contents' '
 
 test_expect_success 'status clean (empty submodule dir)' '
 	git status >output &&
-	test_i18ngrep "nothing to commit" output
+	test_grep "nothing to commit" output
 '
 
 test_expect_success 'status -a clean (empty submodule dir)' '
 	test_must_fail git commit --dry-run -a >output &&
-	test_i18ngrep "nothing to commit" output
+	test_grep "nothing to commit" output
 '
 
 cat >status_expect <<\EOF
@@ -251,6 +252,7 @@ test_expect_success 'status with merge conflict in .gitmodules' '
 	test_create_repo_with_commit sub1 &&
 	test_tick &&
 	test_create_repo_with_commit sub2 &&
+	test_config_global protocol.file.allow always &&
 	(
 		cd super &&
 		prev=$(git rev-parse HEAD) &&
@@ -326,6 +328,7 @@ test_expect_success 'diff --submodule with merge conflict in .gitmodules' '
 # sub2 will have an untracked file
 # sub3 will have an untracked repository
 test_expect_success 'setup superproject with untracked file in nested submodule' '
+	test_config_global protocol.file.allow always &&
 	(
 		cd super &&
 		git clean -dfx &&
diff --git a/t/t7507-commit-verbose.sh b/t/t7507-commit-verbose.sh
index ed2653d..4c7db19 100755
--- a/t/t7507-commit-verbose.sh
+++ b/t/t7507-commit-verbose.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='verbose commit template'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 write_script "check-for-diff" <<\EOF &&
@@ -74,6 +76,7 @@ test_expect_success 'diff in message is retained with -v' '
 
 test_expect_success 'submodule log is stripped out too with -v' '
 	git config diff.submodule log &&
+	test_config_global protocol.file.allow always &&
 	git submodule add ./. sub &&
 	git commit -m "sub added" &&
 	(
@@ -86,7 +89,7 @@ test_expect_success 'submodule log is stripped out too with -v' '
 		export GIT_EDITOR &&
 		test_must_fail git commit -a -v 2>err
 	) &&
-	test_i18ngrep "Aborting commit due to empty commit message." err
+	test_grep "Aborting commit due to empty commit message." err
 '
 
 test_expect_success 'verbose diff is stripped out with set core.commentChar' '
@@ -95,7 +98,17 @@ test_expect_success 'verbose diff is stripped out with set core.commentChar' '
 		export GIT_EDITOR &&
 		test_must_fail git -c core.commentchar=";" commit -a -v 2>err
 	) &&
-	test_i18ngrep "Aborting commit due to empty commit message." err
+	test_grep "Aborting commit due to empty commit message." err
+'
+
+test_expect_success 'verbose diff is stripped with multi-byte comment char' '
+	(
+		GIT_EDITOR=cat &&
+		export GIT_EDITOR &&
+		test_must_fail git -c core.commentchar="foo>" commit -a -v >out 2>err
+	) &&
+	grep "^foo> " out &&
+	test_grep "Aborting commit due to empty commit message." err
 '
 
 test_expect_success 'status does not verbose without --verbose' '
diff --git a/t/t7508-status.sh b/t/t7508-status.sh
index e817593..773383f 100755
--- a/t/t7508-status.sh
+++ b/t/t7508-status.sh
@@ -5,6 +5,7 @@
 
 test_description='git status'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-terminal.sh
 
@@ -18,7 +19,7 @@ test_expect_success 'status -h in broken repository' '
 		echo "[status] showuntrackedfiles = CORRUPT" >>.git/config &&
 		test_expect_code 129 git status -h >usage 2>&1
 	) &&
-	test_i18ngrep "[Uu]sage" broken/usage
+	test_grep "[Uu]sage" broken/usage
 '
 
 test_expect_success 'commit -h in broken repository' '
@@ -30,18 +31,18 @@ test_expect_success 'commit -h in broken repository' '
 		echo "[status] showuntrackedfiles = CORRUPT" >>.git/config &&
 		test_expect_code 129 git commit -h >usage 2>&1
 	) &&
-	test_i18ngrep "[Uu]sage" broken/usage
+	test_grep "[Uu]sage" broken/usage
 '
 
 test_expect_success 'create upstream branch' '
 	git checkout -b upstream &&
 	test_commit upstream1 &&
 	test_commit upstream2 &&
-	# leave the first commit on master as root because several
+	# leave the first commit on main as root because several
 	# tests depend on this case; for our upstream we only
 	# care about commit counts anyway, so a totally divergent
 	# history is OK
-	git checkout --orphan master
+	git checkout --orphan main
 '
 
 test_expect_success 'setup' '
@@ -71,7 +72,7 @@ test_expect_success 'setup' '
 '
 
 test_expect_success 'status (1)' '
-	test_i18ngrep "use \"git rm --cached <file>\.\.\.\" to unstage" output
+	test_grep "use \"git rm --cached <file>\.\.\.\" to unstage" output
 '
 
 strip_comments () {
@@ -88,10 +89,10 @@ EOF
 
 test_expect_success 'status --column' '
 	cat >expect <<\EOF &&
-# On branch master
+# On branch main
 # Your branch and '\''upstream'\'' have diverged,
 # and have 1 and 2 different commits each, respectively.
-#   (use "git pull" to merge the remote branch into yours)
+#   (use "git pull" if you want to integrate the remote branch with yours)
 #
 # Changes to be committed:
 #   (use "git restore --staged <file>..." to unstage)
@@ -109,20 +110,20 @@ test_expect_success 'status --column' '
 #
 EOF
 	COLUMNS=50 git -c status.displayCommentPrefix=true status --column="column dense" >output &&
-	test_i18ncmp expect output
+	test_cmp expect output
 '
 
 test_expect_success 'status --column status.displayCommentPrefix=false' '
 	strip_comments expect &&
 	COLUMNS=49 git -c status.displayCommentPrefix=false status --column="column dense" >output &&
-	test_i18ncmp expect output
+	test_cmp expect output
 '
 
 cat >expect <<\EOF
-# On branch master
+# On branch main
 # Your branch and 'upstream' have diverged,
 # and have 1 and 2 different commits each, respectively.
-#   (use "git pull" to merge the remote branch into yours)
+#   (use "git pull" if you want to integrate the remote branch with yours)
 #
 # Changes to be committed:
 #   (use "git restore --staged <file>..." to unstage)
@@ -144,19 +145,19 @@ EOF
 
 test_expect_success 'status with status.displayCommentPrefix=true' '
 	git -c status.displayCommentPrefix=true status >output &&
-	test_i18ncmp expect output
+	test_cmp expect output
 '
 
 test_expect_success 'status with status.displayCommentPrefix=false' '
 	strip_comments expect &&
 	git -c status.displayCommentPrefix=false status >output &&
-	test_i18ncmp expect output
+	test_cmp expect output
 '
 
 test_expect_success 'status -v' '
 	(cat expect && git diff --cached) >expect-with-v &&
 	git status -v >output &&
-	test_i18ncmp expect-with-v output
+	test_cmp expect-with-v output
 '
 
 test_expect_success 'status -v -v' '
@@ -167,7 +168,7 @@ test_expect_success 'status -v -v' '
 	 echo "Changes not staged for commit:" &&
 	 git -c diff.mnemonicprefix=true diff) >expect-with-v &&
 	git status -v -v >output &&
-	test_i18ncmp expect-with-v output
+	test_cmp expect-with-v output
 '
 
 test_expect_success 'setup fake editor' '
@@ -193,7 +194,7 @@ test_expect_success 'commit ignores status.displayCommentPrefix=false in COMMIT_
 '
 
 cat >expect <<\EOF
-On branch master
+On branch main
 Your branch and 'upstream' have diverged,
 and have 1 and 2 different commits each, respectively.
 
@@ -214,7 +215,7 @@ EOF
 test_expect_success 'status (advice.statusHints false)' '
 	test_config advice.statusHints false &&
 	git status >output &&
-	test_i18ncmp expect output
+	test_cmp expect output
 
 '
 
@@ -266,10 +267,10 @@ test_expect_success 'status with gitignore' '
 	test_cmp expect output &&
 
 	cat >expect <<\EOF &&
-On branch master
+On branch main
 Your branch and '\''upstream'\'' have diverged,
 and have 1 and 2 different commits each, respectively.
-  (use "git pull" to merge the remote branch into yours)
+  (use "git pull" if you want to integrate the remote branch with yours)
 
 Changes to be committed:
   (use "git restore --staged <file>..." to unstage)
@@ -296,7 +297,7 @@ Ignored files:
 
 EOF
 	git status --ignored >output &&
-	test_i18ncmp expect output
+	test_cmp expect output
 '
 
 test_expect_success 'status with gitignore (nothing untracked)' '
@@ -331,10 +332,10 @@ test_expect_success 'status with gitignore (nothing untracked)' '
 	test_cmp expect output &&
 
 	cat >expect <<\EOF &&
-On branch master
+On branch main
 Your branch and '\''upstream'\'' have diverged,
 and have 1 and 2 different commits each, respectively.
-  (use "git pull" to merge the remote branch into yours)
+  (use "git pull" if you want to integrate the remote branch with yours)
 
 Changes to be committed:
   (use "git restore --staged <file>..." to unstage)
@@ -358,7 +359,7 @@ Ignored files:
 
 EOF
 	git status --ignored >output &&
-	test_i18ncmp expect output
+	test_cmp expect output
 '
 
 cat >.gitignore <<\EOF
@@ -368,7 +369,7 @@ output*
 EOF
 
 cat >expect <<\EOF
-## master...upstream [ahead 1, behind 2]
+## main...upstream [ahead 1, behind 2]
  M dir1/modified
 A  dir2/added
 ?? dir1/untracked
@@ -380,7 +381,7 @@ EOF
 test_expect_success 'status -s -b' '
 
 	git status -s -b >output &&
-	test_i18ncmp expect output
+	test_cmp expect output
 
 '
 
@@ -390,7 +391,7 @@ test_expect_success 'status -s -z -b' '
 	git status -s -z -b >output &&
 	nul_to_q <output >output.q &&
 	mv output.q output &&
-	test_i18ncmp expect output
+	test_cmp expect output
 '
 
 test_expect_success 'setup dir3' '
@@ -401,10 +402,10 @@ test_expect_success 'setup dir3' '
 
 test_expect_success 'status -uno' '
 	cat >expect <<EOF &&
-On branch master
+On branch main
 Your branch and '\''upstream'\'' have diverged,
 and have 1 and 2 different commits each, respectively.
-  (use "git pull" to merge the remote branch into yours)
+  (use "git pull" if you want to integrate the remote branch with yours)
 
 Changes to be committed:
   (use "git restore --staged <file>..." to unstage)
@@ -418,18 +419,23 @@ Changes not staged for commit:
 Untracked files not listed (use -u option to show untracked files)
 EOF
 	git status -uno >output &&
-	test_i18ncmp expect output
+	test_cmp expect output &&
+	git status -ufalse >output &&
+	test_cmp expect output
 '
 
-test_expect_success 'status (status.showUntrackedFiles no)' '
-	test_config status.showuntrackedfiles no &&
-	git status >output &&
-	test_i18ncmp expect output
-'
+for no in no false 0
+do
+	test_expect_success "status (status.showUntrackedFiles $no)" '
+		test_config status.showuntrackedfiles "$no" &&
+		git status >output &&
+		test_cmp expect output
+	'
+done
 
 test_expect_success 'status -uno (advice.statusHints false)' '
 	cat >expect <<EOF &&
-On branch master
+On branch main
 Your branch and '\''upstream'\'' have diverged,
 and have 1 and 2 different commits each, respectively.
 
@@ -443,7 +449,7 @@ Untracked files not listed
 EOF
 	test_config advice.statusHints false &&
 	git status -uno >output &&
-	test_i18ncmp expect output
+	test_cmp expect output
 '
 
 cat >expect << EOF
@@ -463,10 +469,10 @@ test_expect_success 'status -s (status.showUntrackedFiles no)' '
 
 test_expect_success 'status -unormal' '
 	cat >expect <<EOF &&
-On branch master
+On branch main
 Your branch and '\''upstream'\'' have diverged,
 and have 1 and 2 different commits each, respectively.
-  (use "git pull" to merge the remote branch into yours)
+  (use "git pull" if you want to integrate the remote branch with yours)
 
 Changes to be committed:
   (use "git restore --staged <file>..." to unstage)
@@ -487,14 +493,21 @@ Untracked files:
 
 EOF
 	git status -unormal >output &&
-	test_i18ncmp expect output
+	test_cmp expect output &&
+	git status -utrue >output &&
+	test_cmp expect output &&
+	git status -uyes >output &&
+	test_cmp expect output
 '
 
-test_expect_success 'status (status.showUntrackedFiles normal)' '
-	test_config status.showuntrackedfiles normal &&
-	git status >output &&
-	test_i18ncmp expect output
-'
+for normal in normal true 1
+do
+	test_expect_success "status (status.showUntrackedFiles $normal)" '
+		test_config status.showuntrackedfiles $normal &&
+		git status >output &&
+		test_cmp expect output
+	'
+done
 
 cat >expect <<EOF
  M dir1/modified
@@ -518,10 +531,10 @@ test_expect_success 'status -s (status.showUntrackedFiles normal)' '
 
 test_expect_success 'status -uall' '
 	cat >expect <<EOF &&
-On branch master
+On branch main
 Your branch and '\''upstream'\'' have diverged,
 and have 1 and 2 different commits each, respectively.
-  (use "git pull" to merge the remote branch into yours)
+  (use "git pull" if you want to integrate the remote branch with yours)
 
 Changes to be committed:
   (use "git restore --staged <file>..." to unstage)
@@ -543,13 +556,13 @@ Untracked files:
 
 EOF
 	git status -uall >output &&
-	test_i18ncmp expect output
+	test_cmp expect output
 '
 
 test_expect_success 'status (status.showUntrackedFiles all)' '
 	test_config status.showuntrackedfiles all &&
 	git status >output &&
-	test_i18ncmp expect output
+	test_cmp expect output
 '
 
 test_expect_success 'teardown dir3' '
@@ -578,10 +591,10 @@ test_expect_success 'status -s (status.showUntrackedFiles all)' '
 
 test_expect_success 'status with relative paths' '
 	cat >expect <<\EOF &&
-On branch master
+On branch main
 Your branch and '\''upstream'\'' have diverged,
 and have 1 and 2 different commits each, respectively.
-  (use "git pull" to merge the remote branch into yours)
+  (use "git pull" if you want to integrate the remote branch with yours)
 
 Changes to be committed:
   (use "git restore --staged <file>..." to unstage)
@@ -601,7 +614,7 @@ Untracked files:
 
 EOF
 	(cd dir1 && git status) >output &&
-	test_i18ncmp expect output
+	test_cmp expect output
 '
 
 cat >expect <<\EOF
@@ -646,10 +659,10 @@ test_expect_success 'setup unique colors' '
 
 test_expect_success TTY 'status with color.ui' '
 	cat >expect <<\EOF &&
-On branch <GREEN>master<RESET>
+On branch <GREEN>main<RESET>
 Your branch and '\''upstream'\'' have diverged,
 and have 1 and 2 different commits each, respectively.
-  (use "git pull" to merge the remote branch into yours)
+  (use "git pull" if you want to integrate the remote branch with yours)
 
 Changes to be committed:
   (use "git restore --staged <file>..." to unstage)
@@ -670,13 +683,13 @@ Untracked files:
 EOF
 	test_config color.ui auto &&
 	test_terminal git status | test_decode_color >output &&
-	test_i18ncmp expect output
+	test_cmp expect output
 '
 
 test_expect_success TTY 'status with color.status' '
 	test_config color.status auto &&
 	test_terminal git status | test_decode_color >output &&
-	test_i18ncmp expect output
+	test_cmp expect output
 '
 
 cat >expect <<\EOF
@@ -706,7 +719,7 @@ test_expect_success TTY 'status -s with color.status' '
 '
 
 cat >expect <<\EOF
-## <YELLOW>master<RESET>...<CYAN>upstream<RESET> [ahead <YELLOW>1<RESET>, behind <CYAN>2<RESET>]
+## <YELLOW>main<RESET>...<CYAN>upstream<RESET> [ahead <YELLOW>1<RESET>, behind <CYAN>2<RESET>]
  <RED>M<RESET> dir1/modified
 <GREEN>A<RESET>  dir2/added
 <BLUE>??<RESET> dir1/untracked
@@ -718,7 +731,7 @@ EOF
 test_expect_success TTY 'status -s -b with color.status' '
 
 	test_terminal git status -s -b | test_decode_color >output &&
-	test_i18ncmp expect output
+	test_cmp expect output
 
 '
 
@@ -757,7 +770,7 @@ test_expect_success 'status --porcelain respects -b' '
 
 	git status --porcelain -b >output &&
 	{
-		echo "## master...upstream [ahead 1, behind 2]" &&
+		echo "## main...upstream [ahead 1, behind 2]" &&
 		cat expect
 	} >tmp &&
 	mv tmp expect &&
@@ -769,10 +782,10 @@ test_expect_success 'status --porcelain respects -b' '
 
 test_expect_success 'status without relative paths' '
 	cat >expect <<\EOF &&
-On branch master
+On branch main
 Your branch and '\''upstream'\'' have diverged,
 and have 1 and 2 different commits each, respectively.
-  (use "git pull" to merge the remote branch into yours)
+  (use "git pull" if you want to integrate the remote branch with yours)
 
 Changes to be committed:
   (use "git restore --staged <file>..." to unstage)
@@ -793,7 +806,7 @@ Untracked files:
 EOF
 	test_config status.relativePaths false &&
 	(cd dir1 && git status) >output &&
-	test_i18ncmp expect output
+	test_cmp expect output
 
 '
 
@@ -814,12 +827,38 @@ test_expect_success 'status -s without relative paths' '
 
 '
 
+cat >expect <<\EOF
+ M dir1/modified
+A  dir2/added
+A  "file with spaces"
+?? dir1/untracked
+?? dir2/modified
+?? dir2/untracked
+?? "file with spaces 2"
+?? untracked
+EOF
+
+test_expect_success 'status -s without relative paths' '
+	test_when_finished "git rm --cached \"file with spaces\"; rm -f file*" &&
+	>"file with spaces" &&
+	>"file with spaces 2" &&
+	>"expect with spaces" &&
+	git add "file with spaces" &&
+
+	git status -s >output &&
+	test_cmp expect output &&
+
+	git status -s --ignored >output &&
+	grep "^!! \"expect with spaces\"$" output &&
+	grep -v "^!! " output >output-wo-ignored &&
+	test_cmp expect output-wo-ignored
+'
+
 test_expect_success 'dry-run of partial commit excluding new file in index' '
 	cat >expect <<EOF &&
-On branch master
+On branch main
 Your branch and '\''upstream'\'' have diverged,
 and have 1 and 2 different commits each, respectively.
-  (use "git pull" to merge the remote branch into yours)
 
 Changes to be committed:
   (use "git restore --staged <file>..." to unstage)
@@ -833,7 +872,7 @@ Untracked files:
 
 EOF
 	git commit --dry-run dir1/modified >output &&
-	test_i18ncmp expect output
+	test_cmp expect output
 '
 
 cat >expect <<EOF
@@ -846,6 +885,18 @@ test_expect_success 'status refreshes the index' '
 	test_cmp expect output
 '
 
+test_expect_success 'status shows detached HEAD properly after checking out non-local upstream branch' '
+	test_when_finished rm -rf upstream downstream actual &&
+
+	test_create_repo upstream &&
+	test_commit -C upstream foo &&
+
+	git clone upstream downstream &&
+	git -C downstream checkout @{u} &&
+	git -C downstream status >actual &&
+	grep -E "HEAD detached at [0-9a-f]+" actual
+'
+
 test_expect_success 'setup status submodule summary' '
 	test_create_repo sm && (
 		cd sm &&
@@ -858,10 +909,10 @@ test_expect_success 'setup status submodule summary' '
 
 test_expect_success 'status submodule summary is disabled by default' '
 	cat >expect <<EOF &&
-On branch master
+On branch main
 Your branch and '\''upstream'\'' have diverged,
 and have 1 and 2 different commits each, respectively.
-  (use "git pull" to merge the remote branch into yours)
+  (use "git pull" if you want to integrate the remote branch with yours)
 
 Changes to be committed:
   (use "git restore --staged <file>..." to unstage)
@@ -882,13 +933,13 @@ Untracked files:
 
 EOF
 	git status >output &&
-	test_i18ncmp expect output
+	test_cmp expect output
 '
 
 # we expect the same as the previous test
 test_expect_success 'status --untracked-files=all does not show submodule' '
 	git status --untracked-files=all >output &&
-	test_i18ncmp expect output
+	test_cmp expect output
 '
 
 cat >expect <<EOF
@@ -915,10 +966,10 @@ head=$(cd sm && git rev-parse --short=7 --verify HEAD)
 
 test_expect_success 'status submodule summary' '
 	cat >expect <<EOF &&
-On branch master
+On branch main
 Your branch and '\''upstream'\'' have diverged,
 and have 1 and 2 different commits each, respectively.
-  (use "git pull" to merge the remote branch into yours)
+  (use "git pull" if you want to integrate the remote branch with yours)
 
 Changes to be committed:
   (use "git restore --staged <file>..." to unstage)
@@ -945,13 +996,13 @@ Untracked files:
 EOF
 	git config status.submodulesummary 10 &&
 	git status >output &&
-	test_i18ncmp expect output
+	test_cmp expect output
 '
 
 test_expect_success 'status submodule summary with status.displayCommentPrefix=false' '
 	strip_comments expect &&
 	git -c status.displayCommentPrefix=false status >output &&
-	test_i18ncmp expect output
+	test_cmp expect output
 '
 
 test_expect_success 'commit with submodule summary ignores status.displayCommentPrefix' '
@@ -973,11 +1024,11 @@ test_expect_success 'status -s submodule summary' '
 '
 
 test_expect_success 'status submodule summary (clean submodule): commit' '
-	cat >expect <<EOF &&
-On branch master
+	cat >expect-status <<EOF &&
+On branch main
 Your branch and '\''upstream'\'' have diverged,
 and have 2 and 2 different commits each, respectively.
-  (use "git pull" to merge the remote branch into yours)
+  (use "git pull" if you want to integrate the remote branch with yours)
 
 Changes not staged for commit:
   (use "git add <file>..." to update what will be committed)
@@ -993,12 +1044,13 @@ Untracked files:
 
 no changes added to commit (use "git add" and/or "git commit -a")
 EOF
+	sed "/git pull/d" expect-status > expect-commit &&
 	git commit -m "commit submodule" &&
 	git config status.submodulesummary 10 &&
 	test_must_fail git commit --dry-run >output &&
-	test_i18ncmp expect output &&
+	test_cmp expect-commit output &&
 	git status >output &&
-	test_i18ncmp expect output
+	test_cmp expect-status output
 '
 
 cat >expect <<EOF
@@ -1022,10 +1074,9 @@ test_expect_success 'status -z implies porcelain' '
 
 test_expect_success 'commit --dry-run submodule summary (--amend)' '
 	cat >expect <<EOF &&
-On branch master
+On branch main
 Your branch and '\''upstream'\'' have diverged,
 and have 2 and 2 different commits each, respectively.
-  (use "git pull" to merge the remote branch into yours)
 
 Changes to be committed:
   (use "git restore --source=HEAD^1 --staged <file>..." to unstage)
@@ -1052,7 +1103,7 @@ Untracked files:
 EOF
 	git config status.submodulesummary 10 &&
 	git commit --dry-run --amend >output &&
-	test_i18ncmp expect output
+	test_cmp expect output
 '
 
 test_expect_success POSIXPERM,SANITY 'status succeeds in a read-only repository' '
@@ -1074,10 +1125,10 @@ touch .gitmodules
 
 test_expect_success '--ignore-submodules=untracked suppresses submodules with untracked content' '
 	cat > expect << EOF &&
-On branch master
+On branch main
 Your branch and '\''upstream'\'' have diverged,
 and have 2 and 2 different commits each, respectively.
-  (use "git pull" to merge the remote branch into yours)
+  (use "git pull" if you want to integrate the remote branch with yours)
 
 Changes to be committed:
   (use "git restore --staged <file>..." to unstage)
@@ -1104,17 +1155,17 @@ Untracked files:
 EOF
 	echo modified  sm/untracked &&
 	git status --ignore-submodules=untracked >output &&
-	test_i18ncmp expect output
+	test_cmp expect output
 '
 
 test_expect_success '.gitmodules ignore=untracked suppresses submodules with untracked content' '
 	test_config diff.ignoreSubmodules dirty &&
 	git status >output &&
-	test_i18ncmp expect output &&
+	test_cmp expect output &&
 	git config --add -f .gitmodules submodule.subname.ignore untracked &&
 	git config --add -f .gitmodules submodule.subname.path sm &&
 	git status >output &&
-	test_i18ncmp expect output &&
+	test_cmp expect output &&
 	git config -f .gitmodules  --remove-section submodule.subname
 '
 
@@ -1124,14 +1175,14 @@ test_expect_success '.git/config ignore=untracked suppresses submodules with unt
 	git config --add submodule.subname.ignore untracked &&
 	git config --add submodule.subname.path sm &&
 	git status >output &&
-	test_i18ncmp expect output &&
+	test_cmp expect output &&
 	git config --remove-section submodule.subname &&
 	git config --remove-section -f .gitmodules submodule.subname
 '
 
 test_expect_success '--ignore-submodules=dirty suppresses submodules with untracked content' '
 	git status --ignore-submodules=dirty >output &&
-	test_i18ncmp expect output
+	test_cmp expect output
 '
 
 test_expect_success '.gitmodules ignore=dirty suppresses submodules with untracked content' '
@@ -1141,7 +1192,7 @@ test_expect_success '.gitmodules ignore=dirty suppresses submodules with untrack
 	git config --add -f .gitmodules submodule.subname.ignore dirty &&
 	git config --add -f .gitmodules submodule.subname.path sm &&
 	git status >output &&
-	test_i18ncmp expect output &&
+	test_cmp expect output &&
 	git config -f .gitmodules  --remove-section submodule.subname
 '
 
@@ -1151,7 +1202,7 @@ test_expect_success '.git/config ignore=dirty suppresses submodules with untrack
 	git config --add submodule.subname.ignore dirty &&
 	git config --add submodule.subname.path sm &&
 	git status >output &&
-	test_i18ncmp expect output &&
+	test_cmp expect output &&
 	git config --remove-section submodule.subname &&
 	git config -f .gitmodules  --remove-section submodule.subname
 '
@@ -1159,14 +1210,14 @@ test_expect_success '.git/config ignore=dirty suppresses submodules with untrack
 test_expect_success '--ignore-submodules=dirty suppresses submodules with modified content' '
 	echo modified >sm/foo &&
 	git status --ignore-submodules=dirty >output &&
-	test_i18ncmp expect output
+	test_cmp expect output
 '
 
 test_expect_success '.gitmodules ignore=dirty suppresses submodules with modified content' '
 	git config --add -f .gitmodules submodule.subname.ignore dirty &&
 	git config --add -f .gitmodules submodule.subname.path sm &&
 	git status >output &&
-	test_i18ncmp expect output &&
+	test_cmp expect output &&
 	git config -f .gitmodules  --remove-section submodule.subname
 '
 
@@ -1176,17 +1227,17 @@ test_expect_success '.git/config ignore=dirty suppresses submodules with modifie
 	git config --add submodule.subname.ignore dirty &&
 	git config --add submodule.subname.path sm &&
 	git status >output &&
-	test_i18ncmp expect output &&
+	test_cmp expect output &&
 	git config --remove-section submodule.subname &&
 	git config -f .gitmodules  --remove-section submodule.subname
 '
 
 test_expect_success "--ignore-submodules=untracked doesn't suppress submodules with modified content" '
 	cat > expect << EOF &&
-On branch master
+On branch main
 Your branch and '\''upstream'\'' have diverged,
 and have 2 and 2 different commits each, respectively.
-  (use "git pull" to merge the remote branch into yours)
+  (use "git pull" if you want to integrate the remote branch with yours)
 
 Changes to be committed:
   (use "git restore --staged <file>..." to unstage)
@@ -1214,14 +1265,14 @@ Untracked files:
 
 EOF
 	git status --ignore-submodules=untracked > output &&
-	test_i18ncmp expect output
+	test_cmp expect output
 '
 
 test_expect_success ".gitmodules ignore=untracked doesn't suppress submodules with modified content" '
 	git config --add -f .gitmodules submodule.subname.ignore untracked &&
 	git config --add -f .gitmodules submodule.subname.path sm &&
 	git status >output &&
-	test_i18ncmp expect output &&
+	test_cmp expect output &&
 	git config -f .gitmodules  --remove-section submodule.subname
 '
 
@@ -1231,7 +1282,7 @@ test_expect_success ".git/config ignore=untracked doesn't suppress submodules wi
 	git config --add submodule.subname.ignore untracked &&
 	git config --add submodule.subname.path sm &&
 	git status >output &&
-	test_i18ncmp expect output &&
+	test_cmp expect output &&
 	git config --remove-section submodule.subname &&
 	git config -f .gitmodules  --remove-section submodule.subname
 '
@@ -1240,10 +1291,10 @@ head2=$(cd sm && git commit -q -m "2nd commit" foo && git rev-parse --short=7 --
 
 test_expect_success "--ignore-submodules=untracked doesn't suppress submodule summary" '
 	cat > expect << EOF &&
-On branch master
+On branch main
 Your branch and '\''upstream'\'' have diverged,
 and have 2 and 2 different commits each, respectively.
-  (use "git pull" to merge the remote branch into yours)
+  (use "git pull" if you want to integrate the remote branch with yours)
 
 Changes to be committed:
   (use "git restore --staged <file>..." to unstage)
@@ -1275,14 +1326,14 @@ Untracked files:
 
 EOF
 	git status --ignore-submodules=untracked > output &&
-	test_i18ncmp expect output
+	test_cmp expect output
 '
 
 test_expect_success ".gitmodules ignore=untracked doesn't suppress submodule summary" '
 	git config --add -f .gitmodules submodule.subname.ignore untracked &&
 	git config --add -f .gitmodules submodule.subname.path sm &&
 	git status >output &&
-	test_i18ncmp expect output &&
+	test_cmp expect output &&
 	git config -f .gitmodules  --remove-section submodule.subname
 '
 
@@ -1292,20 +1343,20 @@ test_expect_success ".git/config ignore=untracked doesn't suppress submodule sum
 	git config --add submodule.subname.ignore untracked &&
 	git config --add submodule.subname.path sm &&
 	git status >output &&
-	test_i18ncmp expect output &&
+	test_cmp expect output &&
 	git config --remove-section submodule.subname &&
 	git config -f .gitmodules  --remove-section submodule.subname
 '
 
 test_expect_success "--ignore-submodules=dirty doesn't suppress submodule summary" '
 	git status --ignore-submodules=dirty > output &&
-	test_i18ncmp expect output
+	test_cmp expect output
 '
 test_expect_success ".gitmodules ignore=dirty doesn't suppress submodule summary" '
 	git config --add -f .gitmodules submodule.subname.ignore dirty &&
 	git config --add -f .gitmodules submodule.subname.path sm &&
 	git status >output &&
-	test_i18ncmp expect output &&
+	test_cmp expect output &&
 	git config -f .gitmodules  --remove-section submodule.subname
 '
 
@@ -1315,16 +1366,16 @@ test_expect_success ".git/config ignore=dirty doesn't suppress submodule summary
 	git config --add submodule.subname.ignore dirty &&
 	git config --add submodule.subname.path sm &&
 	git status >output &&
-	test_i18ncmp expect output &&
+	test_cmp expect output &&
 	git config --remove-section submodule.subname &&
 	git config -f .gitmodules  --remove-section submodule.subname
 '
 
 cat > expect << EOF
-; On branch master
+; On branch main
 ; Your branch and 'upstream' have diverged,
 ; and have 2 and 2 different commits each, respectively.
-;   (use "git pull" to merge the remote branch into yours)
+;   (use "git pull" if you want to integrate the remote branch with yours)
 ;
 ; Changes to be committed:
 ;   (use "git restore --staged <file>..." to unstage)
@@ -1359,20 +1410,22 @@ EOF
 test_expect_success "status (core.commentchar with submodule summary)" '
 	test_config core.commentchar ";" &&
 	git -c status.displayCommentPrefix=true status >output &&
-	test_i18ncmp expect output
+	test_cmp expect output
 '
 
 test_expect_success "status (core.commentchar with two chars with submodule summary)" '
 	test_config core.commentchar ";;" &&
-	test_must_fail git -c status.displayCommentPrefix=true status
+	sed "s/^/;/" <expect >expect.double &&
+	git -c status.displayCommentPrefix=true status >output &&
+	test_cmp expect.double output
 '
 
 test_expect_success "--ignore-submodules=all suppresses submodule summary" '
 	cat > expect << EOF &&
-On branch master
+On branch main
 Your branch and '\''upstream'\'' have diverged,
 and have 2 and 2 different commits each, respectively.
-  (use "git pull" to merge the remote branch into yours)
+  (use "git pull" if you want to integrate the remote branch with yours)
 
 Changes not staged for commit:
   (use "git add <file>..." to update what will be committed)
@@ -1390,15 +1443,15 @@ Untracked files:
 no changes added to commit (use "git add" and/or "git commit -a")
 EOF
 	git status --ignore-submodules=all > output &&
-	test_i18ncmp expect output
+	test_cmp expect output
 '
 
 test_expect_success '.gitmodules ignore=all suppresses unstaged submodule summary' '
 	cat > expect << EOF &&
-On branch master
+On branch main
 Your branch and '\''upstream'\'' have diverged,
 and have 2 and 2 different commits each, respectively.
-  (use "git pull" to merge the remote branch into yours)
+  (use "git pull" if you want to integrate the remote branch with yours)
 
 Changes to be committed:
   (use "git restore --staged <file>..." to unstage)
@@ -1421,7 +1474,7 @@ EOF
 	git config --add -f .gitmodules submodule.subname.ignore all &&
 	git config --add -f .gitmodules submodule.subname.path sm &&
 	git status > output &&
-	test_i18ncmp expect output &&
+	test_cmp expect output &&
 	git config -f .gitmodules  --remove-section submodule.subname
 '
 
@@ -1431,7 +1484,7 @@ test_expect_success '.git/config ignore=all suppresses unstaged submodule summar
 	git config --add submodule.subname.ignore all &&
 	git config --add submodule.subname.path sm &&
 	git status > output &&
-	test_i18ncmp expect output &&
+	test_cmp expect output &&
 	git config --remove-section submodule.subname &&
 	git config -f .gitmodules  --remove-section submodule.subname
 '
@@ -1480,8 +1533,8 @@ test_expect_success '"status.branch=true" weaker than "--no-branch"' '
 '
 
 test_expect_success '"status.branch=true" weaker than "--porcelain"' '
-       git -c status.branch=true status --porcelain >actual &&
-       test_cmp expected_nobranch actual
+	git -c status.branch=true status --porcelain >actual &&
+	test_cmp expected_nobranch actual
 '
 
 test_expect_success '"status.branch=false" same as "--no-branch"' '
@@ -1503,22 +1556,21 @@ test_expect_success 'git commit will commit a staged but ignored submodule' '
 	git config --add -f .gitmodules submodule.subname.path sm &&
 	git config --add submodule.subname.ignore all &&
 	git status -s --ignore-submodules=dirty >output &&
-	test_i18ngrep "^M. sm" output &&
+	test_grep "^M. sm" output &&
 	GIT_EDITOR="echo hello >>\"\$1\"" &&
 	export GIT_EDITOR &&
 	git commit -uno &&
 	git status -s --ignore-submodules=dirty >output &&
-	test_i18ngrep ! "^M. sm" output
+	test_grep ! "^M. sm" output
 '
 
 test_expect_success 'git commit --dry-run will show a staged but ignored submodule' '
 	git reset HEAD^ &&
 	git add sm &&
 	cat >expect << EOF &&
-On branch master
+On branch main
 Your branch and '\''upstream'\'' have diverged,
 and have 2 and 2 different commits each, respectively.
-  (use "git pull" to merge the remote branch into yours)
 
 Changes to be committed:
   (use "git restore --staged <file>..." to unstage)
@@ -1532,15 +1584,15 @@ Changes not staged for commit:
 Untracked files not listed (use -u option to show untracked files)
 EOF
 	git commit -uno --dry-run >output &&
-	test_i18ncmp expect output &&
+	test_cmp expect output &&
 	git status -s --ignore-submodules=dirty >output &&
-	test_i18ngrep "^M. sm" output
+	test_grep "^M. sm" output
 '
 
 test_expect_success 'git commit -m will commit a staged but ignored submodule' '
 	git commit -uno -m message &&
 	git status -s --ignore-submodules=dirty >output &&
-	test_i18ngrep ! "^M. sm" output &&
+	test_grep ! "^M. sm" output &&
 	git config --remove-section submodule.subname &&
 	git config -f .gitmodules  --remove-section submodule.subname
 '
@@ -1553,7 +1605,7 @@ test_expect_success 'show stash info with "--show-stash"' '
 	git stash &&
 	git status >expected_default &&
 	git status --show-stash >expected_with_stash &&
-	test_i18ngrep "^Your stash currently has 1 entry$" expected_with_stash
+	test_grep "^Your stash currently has 1 entry$" expected_with_stash
 '
 
 test_expect_success 'no stash info with "--show-stash --no-show-stash"' '
@@ -1580,14 +1632,14 @@ test_expect_success 'no additional info if no stash entries' '
 test_expect_success '"No commits yet" should be noted in status output' '
 	git checkout --orphan empty-branch-1 &&
 	git status >output &&
-	test_i18ngrep "No commits yet" output
+	test_grep "No commits yet" output
 '
 
 test_expect_success '"No commits yet" should not be noted in status output' '
 	git checkout --orphan empty-branch-2 &&
 	test_commit test-commit-1 &&
 	git status >output &&
-	test_i18ngrep ! "No commits yet" output
+	test_grep ! "No commits yet" output
 '
 
 test_expect_success '"Initial commit" should be noted in commit template' '
@@ -1595,7 +1647,7 @@ test_expect_success '"Initial commit" should be noted in commit template' '
 	touch to_be_committed_1 &&
 	git add to_be_committed_1 &&
 	git commit --dry-run >output &&
-	test_i18ngrep "Initial commit" output
+	test_grep "Initial commit" output
 '
 
 test_expect_success '"Initial commit" should not be noted in commit template' '
@@ -1604,17 +1656,123 @@ test_expect_success '"Initial commit" should not be noted in commit template' '
 	touch to_be_committed_2 &&
 	git add to_be_committed_2 &&
 	git commit --dry-run >output &&
-	test_i18ngrep ! "Initial commit" output
+	test_grep ! "Initial commit" output
 '
 
 test_expect_success '--no-optional-locks prevents index update' '
-	test-tool chmtime =1234567890 .git/index &&
+	test_set_magic_mtime .git/index &&
 	git --no-optional-locks status &&
-	test-tool chmtime --get .git/index >out &&
-	grep ^1234567890 out &&
+	test_is_magic_mtime .git/index &&
+	git status &&
+	! test_is_magic_mtime .git/index
+'
+
+test_expect_success 'racy timestamps will be fixed for clean worktree' '
+	echo content >racy-dirty &&
+	echo content >racy-racy &&
+	git add racy* &&
+	git commit -m "racy test files" &&
+	# let status rewrite the index, if necessary; after that we expect
+	# no more index writes unless caused by racy timestamps; note that
+	# timestamps may already be racy now (depending on previous tests)
+	git status &&
+	test_set_magic_mtime .git/index &&
+	git status &&
+	! test_is_magic_mtime .git/index
+'
+
+test_expect_success 'racy timestamps will be fixed for dirty worktree' '
+	echo content2 >racy-dirty &&
+	git status &&
+	test_set_magic_mtime .git/index &&
 	git status &&
-	test-tool chmtime --get .git/index >out &&
-	! grep ^1234567890 out
+	! test_is_magic_mtime .git/index
+'
+
+test_expect_success 'setup slow status advice' '
+	GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main git init slowstatus &&
+	(
+		cd slowstatus &&
+		cat >.gitignore <<-\EOF &&
+		/actual
+		/expected
+		/out
+		EOF
+		git add .gitignore &&
+		git commit -m "Add .gitignore" &&
+		git config advice.statusuoption true
+	)
+'
+
+test_expect_success 'slow status advice when core.untrackedCache and fsmonitor are unset' '
+	(
+		cd slowstatus &&
+		git config core.untrackedCache false &&
+		git config core.fsmonitor false &&
+		GIT_TEST_UF_DELAY_WARNING=1 git status >actual &&
+		cat >expected <<-\EOF &&
+		On branch main
+
+		It took 3.25 seconds to enumerate untracked files.
+		See '\''git help status'\'' for information on how to improve this.
+
+		nothing to commit, working tree clean
+		EOF
+		test_cmp expected actual
+	)
+'
+
+test_expect_success 'slow status advice when core.untrackedCache true, but not fsmonitor' '
+	(
+		cd slowstatus &&
+		git config core.untrackedCache true &&
+		git config core.fsmonitor false &&
+		GIT_TEST_UF_DELAY_WARNING=1 git status >actual &&
+		cat >expected <<-\EOF &&
+		On branch main
+
+		It took 3.25 seconds to enumerate untracked files.
+		See '\''git help status'\'' for information on how to improve this.
+
+		nothing to commit, working tree clean
+		EOF
+		test_cmp expected actual
+	)
+'
+
+test_expect_success 'slow status advice when core.untrackedCache true, and fsmonitor' '
+	(
+		cd slowstatus &&
+		git config core.untrackedCache true &&
+		git config core.fsmonitor true &&
+		GIT_TEST_UF_DELAY_WARNING=1 git status >actual &&
+		cat >expected <<-\EOF &&
+		On branch main
+
+		It took 3.25 seconds to enumerate untracked files,
+		but the results were cached, and subsequent runs may be faster.
+		See '\''git help status'\'' for information on how to improve this.
+
+		nothing to commit, working tree clean
+		EOF
+		test_cmp expected actual
+	)
+'
+
+test_expect_success EXPENSIVE 'status does not re-read unchanged 4 or 8 GiB file' '
+	(
+		mkdir large-file &&
+		cd large-file &&
+		# Files are 2 GiB, 4 GiB, and 8 GiB sparse files.
+		test-tool truncate file-a 0x080000000 &&
+		test-tool truncate file-b 0x100000000 &&
+		test-tool truncate file-c 0x200000000 &&
+		# This will be slow.
+		git add file-a file-b file-c &&
+		git commit -m "add large files" &&
+		git diff-index HEAD file-a file-b file-c >actual &&
+		test_must_be_empty actual
+	)
 '
 
 test_done
diff --git a/t/t7509-commit-authorship.sh b/t/t7509-commit-authorship.sh
index 500ab2f..fd8c8f8 100755
--- a/t/t7509-commit-authorship.sh
+++ b/t/t7509-commit-authorship.sh
@@ -5,6 +5,7 @@
 
 test_description='commit tests of various authorhip options. '
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 author_header () {
@@ -18,11 +19,8 @@ message_body () {
 }
 
 test_expect_success '-C option copies authorship and message' '
-	echo "Initial" >foo &&
-	git add foo &&
-	test_tick &&
-	git commit -m "Initial Commit" --author Frigate\ \<flying@over.world\> &&
-	git tag Initial &&
+	test_commit --author Frigate\ \<flying@over.world\> \
+		"Initial Commit" foo Initial Initial &&
 	echo "Test 1" >>foo &&
 	test_tick &&
 	git commit -a -C Initial &&
@@ -101,20 +99,20 @@ test_expect_success '--amend option with empty author' '
 	echo "Empty author test" >>foo &&
 	test_tick &&
 	test_must_fail git commit -a -m "empty author" --amend 2>err &&
-	test_i18ngrep "empty ident" err
+	test_grep "empty ident" err
 '
 
 test_expect_success '--amend option with missing author' '
 	git cat-file commit Initial >tmp &&
 	sed "s/author [^<]* </author </" tmp >malformed &&
-	sha=$(git hash-object -t commit -w malformed) &&
+	sha=$(git hash-object --literally -t commit -w malformed) &&
 	test_when_finished "remove_object $sha" &&
 	git checkout $sha &&
 	test_when_finished "git checkout Initial" &&
 	echo "Missing author test" >>foo &&
 	test_tick &&
 	test_must_fail git commit -a -m "malformed author" --amend 2>err &&
-	test_i18ngrep "empty ident" err
+	test_grep "empty ident" err
 '
 
 test_expect_success '--reset-author makes the commit ours even with --amend option' '
@@ -150,7 +148,7 @@ test_expect_success 'commit respects CHERRY_PICK_HEAD and MERGE_MSG' '
 	test_tick &&
 	git commit -am "cherry-pick 1" --author="Cherry <cherry@pick.er>" &&
 	git tag cherry-pick-head &&
-	git rev-parse cherry-pick-head >.git/CHERRY_PICK_HEAD &&
+	git update-ref CHERRY_PICK_HEAD $(git rev-parse cherry-pick-head) &&
 	echo "This is a MERGE_MSG" >.git/MERGE_MSG &&
 	echo "cherry-pick 1b" >>foo &&
 	test_tick &&
@@ -165,7 +163,7 @@ test_expect_success 'commit respects CHERRY_PICK_HEAD and MERGE_MSG' '
 '
 
 test_expect_success '--reset-author with CHERRY_PICK_HEAD' '
-	git rev-parse cherry-pick-head >.git/CHERRY_PICK_HEAD &&
+	git update-ref CHERRY_PICK_HEAD $(git rev-parse cherry-pick-head) &&
 	echo "cherry-pick 2" >>foo &&
 	test_tick &&
 	git commit -am "cherry-pick 2" --reset-author &&
diff --git a/t/t7510-signed-commit.sh b/t/t7510-signed-commit.sh
index 6baaa1a..0d2dd29 100755
--- a/t/t7510-signed-commit.sh
+++ b/t/t7510-signed-commit.sh
@@ -1,6 +1,9 @@
 #!/bin/sh
 
 test_description='signed commit tests'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 GNUPGHOME_NOT_USED=$GNUPGHOME
 . "$TEST_DIRECTORY/lib-gpg.sh"
@@ -25,7 +28,7 @@ test_expect_success GPG 'create signed commits' '
 	echo 3 >elif && git add elif &&
 	test_tick && git commit -m "third on side" &&
 
-	git checkout master &&
+	git checkout main &&
 	test_tick && git merge -S side &&
 	git tag merge &&
 
@@ -107,6 +110,13 @@ test_expect_success GPG 'verify and show signatures' '
 	)
 '
 
+test_expect_success GPG 'verify-commit exits failure on unknown signature' '
+	test_must_fail env GNUPGHOME="$GNUPGHOME_NOT_USED" git verify-commit initial 2>actual &&
+	! grep "Good signature from" actual &&
+	! grep "BAD signature from" actual &&
+	grep -q -F -e "No public key" -e "public key not found" actual
+'
+
 test_expect_success GPG 'verify-commit exits success on untrusted signature' '
 	git verify-commit eighth-signed-alt 2>actual &&
 	grep "Good signature from" actual &&
@@ -172,7 +182,7 @@ test_expect_success GPG 'show signed commit with signature' '
 	git cat-file commit initial >cat &&
 	grep -v -e "gpg: " -e "Warning: " show >show.commit &&
 	grep -e "gpg: " -e "Warning: " show >show.gpg &&
-	grep -v "^ " cat | grep -v "^$(test_oid header) " >cat.commit &&
+	grep -v "^ " cat | grep -v "^gpgsig.* " >cat.commit &&
 	test_cmp show.commit commit &&
 	test_cmp show.gpg verify.2 &&
 	test_cmp cat.commit verify.1
@@ -192,7 +202,7 @@ test_expect_success GPG 'detect fudged signature with NUL' '
 	git cat-file commit seventh-signed >raw &&
 	cat raw >forged2 &&
 	echo Qwik | tr "Q" "\000" >>forged2 &&
-	git hash-object -w -t commit forged2 >forged2.commit &&
+	git hash-object --literally -w -t commit forged2 >forged2.commit &&
 	test_must_fail git verify-commit $(cat forged2.commit) &&
 	git show --pretty=short --show-signature $(cat forged2.commit) >actual2 &&
 	grep "BAD signature from" actual2 &&
@@ -200,7 +210,7 @@ test_expect_success GPG 'detect fudged signature with NUL' '
 '
 
 test_expect_success GPG 'amending already signed commit' '
-	git checkout fourth-signed^0 &&
+	git checkout -f fourth-signed^0 &&
 	git commit --amend -S --no-edit &&
 	git verify-commit HEAD &&
 	git show -s --show-signature HEAD >actual &&
@@ -208,87 +218,101 @@ test_expect_success GPG 'amending already signed commit' '
 	! grep "BAD signature from" actual
 '
 
+test_expect_success GPG2 'bare signature' '
+	git verify-commit fifth-signed 2>expect &&
+	echo >>expect &&
+	git log -1 --format="%GG" fifth-signed >actual &&
+	test_cmp expect actual
+'
+
 test_expect_success GPG 'show good signature with custom format' '
 	cat >expect <<-\EOF &&
 	G
+	ultimate
 	13B6F51ECDDE430D
 	C O Mitter <committer@example.com>
 	73D758744BE721698EC54E8713B6F51ECDDE430D
 	73D758744BE721698EC54E8713B6F51ECDDE430D
 	EOF
-	git log -1 --format="%G?%n%GK%n%GS%n%GF%n%GP" sixth-signed >actual &&
+	git log -1 --format="%G?%n%GT%n%GK%n%GS%n%GF%n%GP" sixth-signed >actual &&
 	test_cmp expect actual
 '
 
 test_expect_success GPG 'show bad signature with custom format' '
 	cat >expect <<-\EOF &&
 	B
+	undefined
 	13B6F51ECDDE430D
 	C O Mitter <committer@example.com>
 
 
 	EOF
-	git log -1 --format="%G?%n%GK%n%GS%n%GF%n%GP" $(cat forged1.commit) >actual &&
+	git log -1 --format="%G?%n%GT%n%GK%n%GS%n%GF%n%GP" $(cat forged1.commit) >actual &&
 	test_cmp expect actual
 '
 
 test_expect_success GPG 'show untrusted signature with custom format' '
 	cat >expect <<-\EOF &&
 	U
+	undefined
 	65A0EEA02E30CAD7
 	Eris Discordia <discord@example.net>
 	F8364A59E07FFE9F4D63005A65A0EEA02E30CAD7
 	D4BE22311AD3131E5EDA29A461092E85B7227189
 	EOF
-	git log -1 --format="%G?%n%GK%n%GS%n%GF%n%GP" eighth-signed-alt >actual &&
+	git log -1 --format="%G?%n%GT%n%GK%n%GS%n%GF%n%GP" eighth-signed-alt >actual &&
 	test_cmp expect actual
 '
 
 test_expect_success GPG 'show untrusted signature with undefined trust level' '
 	cat >expect <<-\EOF &&
+	U
 	undefined
 	65A0EEA02E30CAD7
 	Eris Discordia <discord@example.net>
 	F8364A59E07FFE9F4D63005A65A0EEA02E30CAD7
 	D4BE22311AD3131E5EDA29A461092E85B7227189
 	EOF
-	git log -1 --format="%GT%n%GK%n%GS%n%GF%n%GP" eighth-signed-alt >actual &&
+	git log -1 --format="%G?%n%GT%n%GK%n%GS%n%GF%n%GP" eighth-signed-alt >actual &&
 	test_cmp expect actual
 '
 
 test_expect_success GPG 'show untrusted signature with ultimate trust level' '
 	cat >expect <<-\EOF &&
+	G
 	ultimate
 	13B6F51ECDDE430D
 	C O Mitter <committer@example.com>
 	73D758744BE721698EC54E8713B6F51ECDDE430D
 	73D758744BE721698EC54E8713B6F51ECDDE430D
 	EOF
-	git log -1 --format="%GT%n%GK%n%GS%n%GF%n%GP" sixth-signed >actual &&
+	git log -1 --format="%G?%n%GT%n%GK%n%GS%n%GF%n%GP" sixth-signed >actual &&
 	test_cmp expect actual
 '
 
 test_expect_success GPG 'show unknown signature with custom format' '
 	cat >expect <<-\EOF &&
 	E
+	undefined
 	65A0EEA02E30CAD7
 
 
 
 	EOF
-	GNUPGHOME="$GNUPGHOME_NOT_USED" git log -1 --format="%G?%n%GK%n%GS%n%GF%n%GP" eighth-signed-alt >actual &&
+	GNUPGHOME="$GNUPGHOME_NOT_USED" git log -1 --format="%G?%n%GT%n%GK%n%GS%n%GF%n%GP" eighth-signed-alt >actual &&
 	test_cmp expect actual
 '
 
 test_expect_success GPG 'show lack of signature with custom format' '
 	cat >expect <<-\EOF &&
 	N
+	undefined
 
 
 
 
 	EOF
-	git log -1 --format="%G?%n%GK%n%GS%n%GF%n%GP" seventh-unsigned >actual &&
+	git log -1 --format="%G?%n%GT%n%GK%n%GS%n%GF%n%GP" seventh-unsigned >actual &&
 	test_cmp expect actual
 '
 
@@ -334,4 +358,91 @@ test_expect_success GPG 'show double signature with custom format' '
 	test_cmp expect actual
 '
 
+
+# NEEDSWORK: This test relies on the test_tick commit/author dates from the first
+# 'create signed commits' test even though it creates its own
+test_expect_success GPG 'verify-commit verifies multiply signed commits' '
+	git init multiply-signed &&
+	cd multiply-signed &&
+	test_commit first &&
+	echo 1 >second &&
+	git add second &&
+	tree=$(git write-tree) &&
+	parent=$(git rev-parse HEAD^{commit}) &&
+	git commit --gpg-sign -m second &&
+	git cat-file commit HEAD &&
+	# Avoid trailing whitespace.
+	sed -e "s/^Q//" -e "s/^Z/ /" >commit <<-EOF &&
+	Qtree $tree
+	Qparent $parent
+	Qauthor A U Thor <author@example.com> 1112912653 -0700
+	Qcommitter C O Mitter <committer@example.com> 1112912653 -0700
+	Qgpgsig -----BEGIN PGP SIGNATURE-----
+	QZ
+	Q iHQEABECADQWIQRz11h0S+chaY7FTocTtvUezd5DDQUCX/uBDRYcY29tbWl0dGVy
+	Q QGV4YW1wbGUuY29tAAoJEBO29R7N3kMNd+8AoK1I8mhLHviPH+q2I5fIVgPsEtYC
+	Q AKCTqBh+VabJceXcGIZuF0Ry+udbBQ==
+	Q =tQ0N
+	Q -----END PGP SIGNATURE-----
+	Qgpgsig-sha256 -----BEGIN PGP SIGNATURE-----
+	QZ
+	Q iHQEABECADQWIQRz11h0S+chaY7FTocTtvUezd5DDQUCX/uBIBYcY29tbWl0dGVy
+	Q QGV4YW1wbGUuY29tAAoJEBO29R7N3kMN/NEAn0XO9RYSBj2dFyozi0JKSbssYMtO
+	Q AJwKCQ1BQOtuwz//IjU8TiS+6S4iUw==
+	Q =pIwP
+	Q -----END PGP SIGNATURE-----
+	Q
+	Qsecond
+	EOF
+	head=$(git hash-object -t commit -w commit) &&
+	git reset --hard $head &&
+	git verify-commit $head 2>actual &&
+	grep "Good signature from" actual &&
+	! grep "BAD signature from" actual
+'
+
+test_expect_success 'custom `gpg.program`' '
+	write_script fake-gpg <<-\EOF &&
+	args="$*"
+
+	# skip uninteresting options
+	while case "$1" in
+	--status-fd=*|--keyid-format=*) ;; # skip
+	*) break;;
+	esac; do shift; done
+
+	case "$1" in
+	-bsau)
+		test -z "$LET_GPG_PROGRAM_FAIL" || {
+			echo "zOMG signing failed!" >&2
+			exit 1
+		}
+		cat >sign.file
+		echo "[GNUPG:] SIG_CREATED $args" >&2
+		echo "-----BEGIN PGP MESSAGE-----"
+		echo "$args"
+		echo "-----END PGP MESSAGE-----"
+		;;
+	--verify)
+		cat "$2" >verify.file
+		exit 0
+		;;
+	*)
+		echo "Unhandled args: $*" >&2
+		exit 1
+		;;
+	esac
+	EOF
+
+	test_config gpg.program "$(pwd)/fake-gpg" &&
+	git commit -S --allow-empty -m signed-commit &&
+	test_path_exists sign.file &&
+	git show --show-signature &&
+	test_path_exists verify.file &&
+
+	test_must_fail env LET_GPG_PROGRAM_FAIL=1 \
+	git commit -S --allow-empty -m must-fail 2>err &&
+	grep zOMG err
+'
+
 test_done
diff --git a/t/t7511-status-index.sh b/t/t7511-status-index.sh
index b5fdc04..4ffa45a 100755
--- a/t/t7511-status-index.sh
+++ b/t/t7511-status-index.sh
@@ -2,6 +2,7 @@
 
 test_description='git status with certain file name lengths'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 files="0 1 2 3 4 5 6 7 8 9 a b c d e f g h i j k l m n o p q r s t u v w x y z"
diff --git a/t/t7512-status-help.sh b/t/t7512-status-help.sh
index 29518e0..802f8f7 100755
--- a/t/t7512-status-help.sh
+++ b/t/t7512-status-help.sh
@@ -7,6 +7,9 @@
 
 test_description='git status advice'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 . "$TEST_DIRECTORY"/lib-rebase.sh
@@ -17,14 +20,14 @@ test_expect_success 'prepare for conflicts' '
 	git config --global advice.statusuoption false &&
 	test_commit init main.txt init &&
 	git branch conflicts &&
-	test_commit on_master main.txt on_master &&
+	test_commit on_main main.txt on_main &&
 	git checkout conflicts &&
 	test_commit on_conflicts main.txt on_conflicts
 '
 
 
 test_expect_success 'status when conflicts unresolved' '
-	test_must_fail git merge master &&
+	test_must_fail git merge main &&
 	cat >expected <<\EOF &&
 On branch conflicts
 You have unmerged paths.
@@ -38,13 +41,13 @@ Unmerged paths:
 no changes added to commit (use "git add" and/or "git commit -a")
 EOF
 	git status --untracked-files=no >actual &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 
 test_expect_success 'status when conflicts resolved before commit' '
 	git reset --hard conflicts &&
-	test_must_fail git merge master &&
+	test_must_fail git merge main &&
 	echo one >main.txt &&
 	git add main.txt &&
 	cat >expected <<\EOF &&
@@ -58,12 +61,12 @@ Changes to be committed:
 Untracked files not listed (use -u option to show untracked files)
 EOF
 	git status --untracked-files=no >actual &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 
 test_expect_success 'prepare for rebase conflicts' '
-	git reset --hard master &&
+	git reset --hard main &&
 	git checkout -b rebase_conflicts &&
 	test_commit one_rebase main.txt one &&
 	test_commit two_rebase main.txt two &&
@@ -90,7 +93,7 @@ Unmerged paths:
 no changes added to commit (use "git add" and/or "git commit -a")
 EOF
 	git status --untracked-files=no >actual &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 
@@ -113,16 +116,16 @@ Changes to be committed:
 Untracked files not listed (use -u option to show untracked files)
 EOF
 	git status --untracked-files=no >actual &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 
 test_expect_success 'prepare for rebase_i_conflicts' '
-	git reset --hard master &&
+	git reset --hard main &&
 	git checkout -b rebase_i_conflicts &&
 	test_commit one_unmerge main.txt one_unmerge &&
 	git branch rebase_i_conflicts_second &&
-	test_commit one_master main.txt one_master &&
+	test_commit one_main main.txt one_main &&
 	git checkout rebase_i_conflicts_second &&
 	test_commit one_second main.txt one_second
 '
@@ -151,7 +154,7 @@ Unmerged paths:
 no changes added to commit (use "git add" and/or "git commit -a")
 EOF
 	git status --untracked-files=no >actual &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 
@@ -177,12 +180,12 @@ Changes to be committed:
 Untracked files not listed (use -u option to show untracked files)
 EOF
 	git status --untracked-files=no >actual &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 
 test_expect_success 'status when rebasing -i in edit mode' '
-	git reset --hard master &&
+	git reset --hard main &&
 	git checkout -b rebase_i_edit &&
 	test_commit one_rebase_i main.txt one &&
 	test_commit two_rebase_i main.txt two &&
@@ -207,12 +210,12 @@ You are currently editing a commit while rebasing branch '\''rebase_i_edit'\'' o
 nothing to commit (use -u to show untracked files)
 EOF
 	git status --untracked-files=no >actual &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 
 test_expect_success 'status when splitting a commit' '
-	git reset --hard master &&
+	git reset --hard main &&
 	git checkout -b split_commit &&
 	test_commit one_split main.txt one &&
 	test_commit two_split main.txt two &&
@@ -246,12 +249,12 @@ Changes not staged for commit:
 no changes added to commit (use "git add" and/or "git commit -a")
 EOF
 	git status --untracked-files=no >actual &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 
 test_expect_success 'status after editing the last commit with --amend during a rebase -i' '
-	git reset --hard master &&
+	git reset --hard main &&
 	git checkout -b amend_last &&
 	test_commit one_amend main.txt one &&
 	test_commit two_amend main.txt two &&
@@ -279,12 +282,12 @@ You are currently editing a commit while rebasing branch '\''amend_last'\'' on '
 nothing to commit (use -u to show untracked files)
 EOF
 	git status --untracked-files=no >actual &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 
 test_expect_success 'prepare for several edits' '
-	git reset --hard master &&
+	git reset --hard main &&
 	git checkout -b several_edits &&
 	test_commit one_edits main.txt one &&
 	test_commit two_edits main.txt two &&
@@ -318,7 +321,7 @@ You are currently editing a commit while rebasing branch '\''several_edits'\'' o
 nothing to commit (use -u to show untracked files)
 EOF
 	git status --untracked-files=no >actual &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 
@@ -353,7 +356,7 @@ Changes not staged for commit:
 no changes added to commit (use "git add" and/or "git commit -a")
 EOF
 	git status --untracked-files=no >actual &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 
@@ -384,7 +387,7 @@ You are currently editing a commit while rebasing branch '\''several_edits'\'' o
 nothing to commit (use -u to show untracked files)
 EOF
 	git status --untracked-files=no >actual &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 
@@ -415,7 +418,7 @@ You are currently editing a commit while rebasing branch '\''several_edits'\'' o
 nothing to commit (use -u to show untracked files)
 EOF
 	git status --untracked-files=no >actual &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 
@@ -451,7 +454,7 @@ Changes not staged for commit:
 no changes added to commit (use "git add" and/or "git commit -a")
 EOF
 	git status --untracked-files=no >actual &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 
@@ -483,7 +486,7 @@ You are currently editing a commit while rebasing branch '\''several_edits'\'' o
 nothing to commit (use -u to show untracked files)
 EOF
 	git status --untracked-files=no >actual &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 
@@ -516,7 +519,7 @@ You are currently editing a commit while rebasing branch '\''several_edits'\'' o
 nothing to commit (use -u to show untracked files)
 EOF
 	git status --untracked-files=no >actual &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 
@@ -554,7 +557,7 @@ Changes not staged for commit:
 no changes added to commit (use "git add" and/or "git commit -a")
 EOF
 	git status --untracked-files=no >actual &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 
@@ -588,12 +591,12 @@ You are currently editing a commit while rebasing branch '\''several_edits'\'' o
 nothing to commit (use -u to show untracked files)
 EOF
 	git status --untracked-files=no >actual &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 
 test_expect_success 'prepare am_session' '
-	git reset --hard master &&
+	git reset --hard main &&
 	git checkout -b am_session &&
 	test_commit one_am one.txt "one" &&
 	test_commit two_am two.txt "two" &&
@@ -616,7 +619,7 @@ You are in the middle of an am session.
 nothing to commit (use -u to show untracked files)
 EOF
 	git status --untracked-files=no >actual &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 
@@ -638,7 +641,7 @@ You are in the middle of an am session.
 nothing to commit (use -u to show untracked files)
 EOF
 	git status --untracked-files=no >actual &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 
@@ -656,17 +659,18 @@ On branch am_empty
 You are in the middle of an am session.
 The current patch is empty.
   (use "git am --skip" to skip this patch)
+  (use "git am --allow-empty" to record this patch as an empty commit)
   (use "git am --abort" to restore the original branch)
 
 nothing to commit (use -u to show untracked files)
 EOF
 	git status --untracked-files=no >actual &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 
 test_expect_success 'status when bisecting' '
-	git reset --hard master &&
+	git reset --hard main &&
 	git checkout -b bisect &&
 	test_commit one_bisect main.txt one &&
 	test_commit two_bisect main.txt two &&
@@ -684,12 +688,40 @@ You are currently bisecting, started from branch '\''bisect'\''.
 nothing to commit (use -u to show untracked files)
 EOF
 	git status --untracked-files=no >actual &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
+'
+
+
+test_expect_success 'status when bisecting while rebasing' '
+	git reset --hard main &&
+	test_when_finished "git rebase --abort" &&
+	ONTO=$(git rev-parse --short HEAD^) &&
+	FAKE_LINES="break" git rebase -i HEAD^ &&
+	test_when_finished "git checkout -" &&
+	git checkout -b bisect_while_rebasing &&
+	test_when_finished "git bisect reset" &&
+	git bisect start &&
+	cat >expected <<EOF &&
+On branch bisect_while_rebasing
+Last command done (1 command done):
+   break
+No commands remaining.
+You are currently editing a commit while rebasing branch '\''bisect'\'' on '\''$ONTO'\''.
+  (use "git commit --amend" to amend the current commit)
+  (use "git rebase --continue" once you are satisfied with your changes)
+
+You are currently bisecting, started from branch '\''bisect_while_rebasing'\''.
+  (use "git bisect reset" to get back to the original branch)
+
+nothing to commit (use -u to show untracked files)
+EOF
+	git status --untracked-files=no >actual &&
+	test_cmp expected actual
 '
 
 
 test_expect_success 'status when rebase --apply conflicts with statushints disabled' '
-	git reset --hard master &&
+	git reset --hard main &&
 	git checkout -b statushints_disabled &&
 	test_when_finished "git config --local advice.statushints true" &&
 	git config --local advice.statushints false &&
@@ -709,12 +741,12 @@ Unmerged paths:
 no changes added to commit
 EOF
 	git status --untracked-files=no >actual &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 
 test_expect_success 'prepare for cherry-pick conflicts' '
-	git reset --hard master &&
+	git reset --hard main &&
 	git checkout -b cherry_branch &&
 	test_commit one_cherry main.txt one &&
 	test_commit two_cherries main.txt two &&
@@ -743,7 +775,7 @@ Unmerged paths:
 no changes added to commit (use "git add" and/or "git commit -a")
 EOF
 	git status --untracked-files=no >actual &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 
@@ -767,7 +799,29 @@ Changes to be committed:
 Untracked files not listed (use -u option to show untracked files)
 EOF
 	git status --untracked-files=no >actual &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
+'
+
+test_expect_success 'status when cherry-picking multiple commits' '
+	git reset --hard cherry_branch &&
+	test_when_finished "git cherry-pick --abort" &&
+	test_must_fail git cherry-pick cherry_branch_second one_cherry &&
+	TO_CHERRY_PICK=$(git rev-parse --short CHERRY_PICK_HEAD) &&
+	cat >expected <<EOF &&
+On branch cherry_branch
+You are currently cherry-picking commit $TO_CHERRY_PICK.
+  (fix conflicts and run "git cherry-pick --continue")
+  (use "git cherry-pick --skip" to skip this patch)
+  (use "git cherry-pick --abort" to cancel the cherry-pick operation)
+
+Unmerged paths:
+  (use "git add <file>..." to mark resolution)
+	both modified:   main.txt
+
+no changes added to commit (use "git add" and/or "git commit -a")
+EOF
+	git status --untracked-files=no >actual &&
+	test_cmp expected actual
 '
 
 test_expect_success 'status when cherry-picking after committing conflict resolution' '
@@ -786,7 +840,7 @@ Cherry-pick currently in progress.
 nothing to commit (use -u to show untracked files)
 EOF
 	git status --untracked-files=no >actual &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 test_expect_success 'status shows cherry-pick with invalid oid' '
@@ -795,7 +849,7 @@ test_expect_success 'status shows cherry-pick with invalid oid' '
 	git status --untracked-files=no >actual 2>err &&
 	git cherry-pick --quit &&
 	test_must_be_empty err &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 test_expect_success 'status does not show error if .git/sequencer is a file' '
@@ -813,7 +867,7 @@ HEAD detached at atag
 nothing to commit (use -u to show untracked files)
 EOF
 	git status --untracked-files=no >actual &&
-	test_i18ncmp expected actual &&
+	test_cmp expected actual &&
 
 	git reset --hard HEAD^ &&
 	cat >expected <<\EOF &&
@@ -821,11 +875,11 @@ HEAD detached from atag
 nothing to commit (use -u to show untracked files)
 EOF
 	git status --untracked-files=no >actual &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 test_expect_success 'status while reverting commit (conflicts)' '
-	git checkout master &&
+	git checkout main &&
 	echo before >to-revert.txt &&
 	test_commit before to-revert.txt &&
 	echo old >to-revert.txt &&
@@ -835,7 +889,7 @@ test_expect_success 'status while reverting commit (conflicts)' '
 	TO_REVERT=$(git rev-parse --short HEAD^) &&
 	test_must_fail git revert $TO_REVERT &&
 	cat >expected <<EOF &&
-On branch master
+On branch main
 You are currently reverting commit $TO_REVERT.
   (fix conflicts and run "git revert --continue")
   (use "git revert --skip" to skip this patch)
@@ -849,14 +903,14 @@ Unmerged paths:
 no changes added to commit (use "git add" and/or "git commit -a")
 EOF
 	git status --untracked-files=no >actual &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 test_expect_success 'status while reverting commit (conflicts resolved)' '
 	echo reverted >to-revert.txt &&
 	git add to-revert.txt &&
 	cat >expected <<EOF &&
-On branch master
+On branch main
 You are currently reverting commit $TO_REVERT.
   (all conflicts fixed: run "git revert --continue")
   (use "git revert --skip" to skip this patch)
@@ -869,17 +923,17 @@ Changes to be committed:
 Untracked files not listed (use -u option to show untracked files)
 EOF
 	git status --untracked-files=no >actual &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 test_expect_success 'status after reverting commit' '
 	git revert --continue &&
 	cat >expected <<\EOF &&
-On branch master
+On branch main
 nothing to commit (use -u to show untracked files)
 EOF
 	git status --untracked-files=no >actual &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 test_expect_success 'status while reverting after committing conflict resolution' '
@@ -889,7 +943,7 @@ test_expect_success 'status while reverting after committing conflict resolution
 	echo reverted >to-revert.txt &&
 	git commit -a &&
 	cat >expected <<EOF &&
-On branch master
+On branch main
 Revert currently in progress.
   (run "git revert --continue" to continue)
   (use "git revert --skip" to skip this patch)
@@ -898,11 +952,11 @@ Revert currently in progress.
 nothing to commit (use -u to show untracked files)
 EOF
 	git status --untracked-files=no >actual &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 test_expect_success 'prepare for different number of commits rebased' '
-	git reset --hard master &&
+	git reset --hard main &&
 	git checkout -b several_commits &&
 	test_commit one_commit main.txt one &&
 	test_commit two_commit main.txt two &&
@@ -928,7 +982,7 @@ You are currently editing a commit while rebasing branch '\''several_commits'\''
 nothing to commit (use -u to show untracked files)
 EOF
 	git status --untracked-files=no >actual &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 test_expect_success 'status: two commands done with some white lines in done file' '
@@ -956,7 +1010,7 @@ You are currently editing a commit while rebasing branch '\''several_commits'\''
 nothing to commit (use -u to show untracked files)
 EOF
 	git status --untracked-files=no >actual &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 test_expect_success 'status: two remaining commands with some white lines in todo file' '
@@ -985,7 +1039,7 @@ You are currently editing a commit while rebasing branch '\''several_commits'\''
 nothing to commit (use -u to show untracked files)
 EOF
 	git status --untracked-files=no >actual &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 test_expect_success 'status: handle not-yet-started rebase -i gracefully' '
@@ -1004,7 +1058,7 @@ You are currently editing a commit while rebasing branch '\''several_commits'\''
 
 nothing to commit (use -u to show untracked files)
 EOF
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 test_done
diff --git a/t/t7513-interpret-trailers.sh b/t/t7513-interpret-trailers.sh
index 6602790..3d3e13c 100755
--- a/t/t7513-interpret-trailers.sh
+++ b/t/t7513-interpret-trailers.sh
@@ -51,6 +51,69 @@ test_expect_success 'setup' '
 	EOF
 '
 
+test_expect_success 'with cmd' '
+	test_when_finished "git config --remove-section trailer.bug" &&
+	git config trailer.bug.key "Bug-maker: " &&
+	git config trailer.bug.ifExists "add" &&
+	git config trailer.bug.cmd "echo \"maybe is\"" &&
+	cat >expected2 <<-EOF &&
+
+	Bug-maker: maybe is him
+	Bug-maker: maybe is me
+	EOF
+	git interpret-trailers --trailer "bug: him" --trailer "bug:me" \
+		>actual2 &&
+	test_cmp expected2 actual2
+'
+
+test_expect_success 'with cmd and $1' '
+	test_when_finished "git config --remove-section trailer.bug" &&
+	git config trailer.bug.key "Bug-maker: " &&
+	git config trailer.bug.ifExists "add" &&
+	git config trailer.bug.cmd "echo \"\$1\" is" &&
+	cat >expected2 <<-EOF &&
+
+	Bug-maker: him is him
+	Bug-maker: me is me
+	EOF
+	git interpret-trailers --trailer "bug: him" --trailer "bug:me" \
+		>actual2 &&
+	test_cmp expected2 actual2
+'
+
+test_expect_success 'with cmd and $1 with sh -c' '
+	test_when_finished "git config --remove-section trailer.bug" &&
+	git config trailer.bug.key "Bug-maker: " &&
+	git config trailer.bug.ifExists "replace" &&
+	git config trailer.bug.cmd "sh -c \"echo who is \"\$1\"\"" &&
+	cat >expected2 <<-EOF &&
+
+	Bug-maker: who is me
+	EOF
+	git interpret-trailers --trailer "bug: him" --trailer "bug:me" \
+		>actual2 &&
+	test_cmp expected2 actual2
+'
+
+test_expect_success 'with cmd and $1 with shell script' '
+	test_when_finished "git config --remove-section trailer.bug" &&
+	git config trailer.bug.key "Bug-maker: " &&
+	git config trailer.bug.ifExists "replace" &&
+	git config trailer.bug.cmd "./echoscript" &&
+	cat >expected2 <<-EOF &&
+
+	Bug-maker: who is me
+	EOF
+	cat >echoscript <<-EOF &&
+	#!/bin/sh
+	echo who is "\$1"
+	EOF
+	chmod +x echoscript &&
+	git interpret-trailers --trailer "bug: him" --trailer "bug:me" \
+		>actual2 &&
+	test_cmp expected2 actual2
+'
+
 test_expect_success 'without config' '
 	sed -e "s/ Z\$/ /" >expected <<-\EOF &&
 
@@ -93,7 +156,7 @@ test_expect_success 'with config option on the command line' '
 		Acked-by: Johan
 		Reviewed-by: Peff
 	EOF
-	{ echo; echo "Acked-by: Johan"; } |
+	{ echo && echo "Acked-by: Johan"; } |
 	git -c "trailer.Acked-by.ifexists=addifdifferent" interpret-trailers \
 		--trailer "Reviewed-by: Peff" --trailer "Acked-by: Johan" >actual &&
 	test_cmp expected actual
@@ -426,7 +489,7 @@ test_expect_success 'multiline field treated as atomic for neighbor check' '
 '
 
 test_expect_success 'with config setup' '
-	git config trailer.ack.key "Acked-by: " &&
+	test_config trailer.ack.key "Acked-by: " &&
 	cat >expected <<-\EOF &&
 
 		Acked-by: Peff
@@ -440,8 +503,8 @@ test_expect_success 'with config setup' '
 '
 
 test_expect_success 'with config setup and ":=" as separators' '
-	git config trailer.separators ":=" &&
-	git config trailer.ack.key "Acked-by= " &&
+	test_config trailer.separators ":=" &&
+	test_config trailer.ack.key "Acked-by= " &&
 	cat >expected <<-\EOF &&
 
 		Acked-by= Peff
@@ -455,7 +518,7 @@ test_expect_success 'with config setup and ":=" as separators' '
 '
 
 test_expect_success 'with config setup and "%" as separators' '
-	git config trailer.separators "%" &&
+	test_config trailer.separators "%" &&
 	cat >expected <<-\EOF &&
 
 		bug% 42
@@ -469,6 +532,7 @@ test_expect_success 'with config setup and "%" as separators' '
 '
 
 test_expect_success 'with "%" as separators and a message with trailers' '
+	test_config trailer.separators "%" &&
 	cat >special_message <<-\EOF &&
 		Special Message
 
@@ -490,8 +554,8 @@ test_expect_success 'with "%" as separators and a message with trailers' '
 '
 
 test_expect_success 'with config setup and ":=#" as separators' '
-	git config trailer.separators ":=#" &&
-	git config trailer.bug.key "Bug #" &&
+	test_config trailer.separators ":=#" &&
+	test_config trailer.bug.key "Bug #" &&
 	cat >expected <<-\EOF &&
 
 		Bug #42
@@ -518,6 +582,8 @@ test_expect_success 'with basic patch' '
 '
 
 test_expect_success 'with commit complex message as argument' '
+	test_config trailer.separators ":=" &&
+	test_config trailer.ack.key "Acked-by= " &&
 	cat complex_message_body complex_message_trailers >complex_message &&
 	cat complex_message_body >expected &&
 	sed -e "s/ Z\$/ /" >>expected <<-\EOF &&
@@ -531,6 +597,8 @@ test_expect_success 'with commit complex message as argument' '
 '
 
 test_expect_success 'with 2 files arguments' '
+	test_config trailer.separators ":=" &&
+	test_config trailer.ack.key "Acked-by= " &&
 	cat basic_message >>expected &&
 	echo >>expected &&
 	cat basic_patch >>expected &&
@@ -614,6 +682,9 @@ test_expect_success 'with message that has an old style conflict block' '
 '
 
 test_expect_success 'with commit complex message and trailer args' '
+	test_config trailer.separators ":=#" &&
+	test_config trailer.ack.key "Acked-by= " &&
+	test_config trailer.bug.key "Bug #" &&
 	cat complex_message_body >expected &&
 	sed -e "s/ Z\$/ /" >>expected <<-\EOF &&
 		Fixes: Z
@@ -629,6 +700,9 @@ test_expect_success 'with commit complex message and trailer args' '
 '
 
 test_expect_success 'with complex patch, args and --trim-empty' '
+	test_config trailer.separators ":=#" &&
+	test_config trailer.ack.key "Acked-by= " &&
+	test_config trailer.bug.key "Bug #" &&
 	cat complex_message >complex_patch &&
 	cat basic_patch >>complex_patch &&
 	cat complex_message_body >expected &&
@@ -683,7 +757,10 @@ test_expect_success POSIXPERM,SANITY "in-place editing doesn't clobber original
 '
 
 test_expect_success 'using "where = before"' '
-	git config trailer.bug.where "before" &&
+	test_config trailer.separators ":=#" &&
+	test_config trailer.ack.key "Acked-by= " &&
+	test_config trailer.bug.key "Bug #" &&
+	test_config trailer.bug.where "before" &&
 	cat complex_message_body >expected &&
 	sed -e "s/ Z\$/ /" >>expected <<-\EOF &&
 		Bug #42
@@ -699,7 +776,9 @@ test_expect_success 'using "where = before"' '
 '
 
 test_expect_success 'overriding configuration with "--where after"' '
-	git config trailer.ack.where "before" &&
+	test_config trailer.separators ":=" &&
+	test_config trailer.ack.key "Acked-by= " &&
+	test_config trailer.ack.where "before" &&
 	cat complex_message_body >expected &&
 	sed -e "s/ Z\$/ /" >>expected <<-\EOF &&
 		Fixes: Z
@@ -713,7 +792,12 @@ test_expect_success 'overriding configuration with "--where after"' '
 	test_cmp expected actual
 '
 
-test_expect_success 'using "where = before" with "--no-where"' '
+test_expect_success 'using "--where after" with "--no-where"' '
+	test_config trailer.ack.key "Acked-by= " &&
+	test_config trailer.ack.where "before" &&
+	test_config trailer.bug.key "Bug #" &&
+	test_config trailer.bug.where "before" &&
+	test_config trailer.separators ":=#" &&
 	cat complex_message_body >expected &&
 	sed -e "s/ Z\$/ /" >>expected <<-\EOF &&
 		Bug #42
@@ -728,8 +812,59 @@ test_expect_success 'using "where = before" with "--no-where"' '
 	test_cmp expected actual
 '
 
+# Check whether using "--no-where" clears out only the "--where after", such
+# that we still use the configuration in trailer.where (which is different from
+# the hardcoded default (in WHERE_END) assuming the absence of .gitconfig).
+# Here, the "start" setting of trailer.where is respected, so the new "Acked-by"
+# and "Bug" trailers are placed at the beginning, and not at the end which is
+# the harcoded default.
+test_expect_success 'using "--where after" with "--no-where" defaults to configuration' '
+	test_config trailer.ack.key "Acked-by= " &&
+	test_config trailer.bug.key "Bug #" &&
+	test_config trailer.separators ":=#" &&
+	test_config trailer.where "start" &&
+	cat complex_message_body >expected &&
+	sed -e "s/ Z\$/ /" >>expected <<-\EOF &&
+		Bug #42
+		Acked-by= Peff
+		Fixes: Z
+		Acked-by= Z
+		Reviewed-by: Z
+		Signed-off-by: Z
+	EOF
+	git interpret-trailers --where after --no-where --trailer "ack: Peff" \
+		--trailer "bug: 42" complex_message >actual &&
+	test_cmp expected actual
+'
+
+# The "--where after" will only get respected for the trailer that came
+# immediately after it. For the next trailer (Bug #42), we default to using the
+# hardcoded WHERE_END because we don't have any "trailer.where" or
+# "trailer.bug.where" configured.
+test_expect_success 'using "--no-where" defaults to harcoded default if nothing configured' '
+	test_config trailer.ack.key "Acked-by= " &&
+	test_config trailer.bug.key "Bug #" &&
+	test_config trailer.separators ":=#" &&
+	cat complex_message_body >expected &&
+	sed -e "s/ Z\$/ /" >>expected <<-\EOF &&
+		Fixes: Z
+		Acked-by= Z
+		Acked-by= Peff
+		Reviewed-by: Z
+		Signed-off-by: Z
+		Bug #42
+	EOF
+	git interpret-trailers --where after --trailer "ack: Peff" --no-where \
+		--trailer "bug: 42" complex_message >actual &&
+	test_cmp expected actual
+'
+
 test_expect_success 'using "where = after"' '
-	git config trailer.ack.where "after" &&
+	test_config trailer.ack.key "Acked-by= " &&
+	test_config trailer.ack.where "after" &&
+	test_config trailer.bug.key "Bug #" &&
+	test_config trailer.bug.where "before" &&
+	test_config trailer.separators ":=#" &&
 	cat complex_message_body >expected &&
 	sed -e "s/ Z\$/ /" >>expected <<-\EOF &&
 		Bug #42
@@ -745,8 +880,11 @@ test_expect_success 'using "where = after"' '
 '
 
 test_expect_success 'using "where = end"' '
-	git config trailer.review.key "Reviewed-by" &&
-	git config trailer.review.where "end" &&
+	test_config trailer.review.key "Reviewed-by" &&
+	test_config trailer.review.where "end" &&
+	test_config trailer.ack.key "Acked-by= " &&
+	test_config trailer.ack.where "after" &&
+	test_config trailer.separators ":=" &&
 	cat complex_message_body >expected &&
 	sed -e "s/ Z\$/ /" >>expected <<-\EOF &&
 		Fixes: Z
@@ -764,8 +902,11 @@ test_expect_success 'using "where = end"' '
 '
 
 test_expect_success 'using "where = start"' '
-	git config trailer.review.key "Reviewed-by" &&
-	git config trailer.review.where "start" &&
+	test_config trailer.review.key "Reviewed-by" &&
+	test_config trailer.review.where "start" &&
+	test_config trailer.ack.key "Acked-by= " &&
+	test_config trailer.ack.where "after" &&
+	test_config trailer.separators ":=" &&
 	cat complex_message_body >expected &&
 	sed -e "s/ Z\$/ /" >>expected <<-\EOF &&
 		Reviewed-by: Johannes
@@ -783,8 +924,13 @@ test_expect_success 'using "where = start"' '
 '
 
 test_expect_success 'using "where = before" for a token in the middle of the message' '
-	git config trailer.review.key "Reviewed-by:" &&
-	git config trailer.review.where "before" &&
+	test_config trailer.review.key "Reviewed-by:" &&
+	test_config trailer.review.where "before" &&
+	test_config trailer.ack.key "Acked-by= " &&
+	test_config trailer.ack.where "after" &&
+	test_config trailer.bug.key "Bug #" &&
+	test_config trailer.bug.where "before" &&
+	test_config trailer.separators ":=#" &&
 	cat complex_message_body >expected &&
 	sed -e "s/ Z\$/ /" >>expected <<-\EOF &&
 		Bug #42
@@ -801,6 +947,12 @@ test_expect_success 'using "where = before" for a token in the middle of the mes
 '
 
 test_expect_success 'using "where = before" and --trim-empty' '
+	test_config trailer.ack.key "Acked-by= " &&
+	test_config trailer.ack.where "after" &&
+	test_config trailer.bug.key "Bug #" &&
+	test_config trailer.bug.where "before" &&
+	test_config trailer.review.key "Reviewed-by:" &&
+	test_config trailer.separators ":=#" &&
 	cat complex_message_body >expected &&
 	cat >>expected <<-\EOF &&
 		Bug #46
@@ -815,6 +967,13 @@ test_expect_success 'using "where = before" and --trim-empty' '
 '
 
 test_expect_success 'the default is "ifExists = addIfDifferentNeighbor"' '
+	test_config trailer.ack.key "Acked-by= " &&
+	test_config trailer.ack.where "after" &&
+	test_config trailer.bug.key "Bug #" &&
+	test_config trailer.bug.where "before" &&
+	test_config trailer.review.key "Reviewed-by:" &&
+	test_config trailer.review.where "before" &&
+	test_config trailer.separators ":=#" &&
 	cat complex_message_body >expected &&
 	sed -e "s/ Z\$/ /" >>expected <<-\EOF &&
 		Bug #42
@@ -833,7 +992,13 @@ test_expect_success 'the default is "ifExists = addIfDifferentNeighbor"' '
 '
 
 test_expect_success 'default "ifExists" is now "addIfDifferent"' '
-	git config trailer.ifexists "addIfDifferent" &&
+	test_config trailer.ifexists "addIfDifferent" &&
+	test_config trailer.ack.key "Acked-by= " &&
+	test_config trailer.ack.where "after" &&
+	test_config trailer.bug.key "Bug #" &&
+	test_config trailer.bug.where "before" &&
+	test_config trailer.review.key "Reviewed-by:" &&
+	test_config trailer.separators ":=#" &&
 	cat complex_message_body >expected &&
 	sed -e "s/ Z\$/ /" >>expected <<-\EOF &&
 		Bug #42
@@ -851,8 +1016,14 @@ test_expect_success 'default "ifExists" is now "addIfDifferent"' '
 '
 
 test_expect_success 'using "ifExists = addIfDifferent" with "where = end"' '
-	git config trailer.ack.ifExists "addIfDifferent" &&
-	git config trailer.ack.where "end" &&
+	test_config trailer.ack.ifExists "addIfDifferent" &&
+	test_config trailer.ack.key "Acked-by= " &&
+	test_config trailer.ack.where "end" &&
+	test_config trailer.bug.key "Bug #" &&
+	test_config trailer.bug.where "before" &&
+	test_config trailer.review.key "Reviewed-by:" &&
+	test_config trailer.ifexists "addIfDifferent" &&
+	test_config trailer.separators ":=#" &&
 	cat complex_message_body >expected &&
 	sed -e "s/ Z\$/ /" >>expected <<-\EOF &&
 		Bug #42
@@ -869,8 +1040,14 @@ test_expect_success 'using "ifExists = addIfDifferent" with "where = end"' '
 '
 
 test_expect_success 'using "ifExists = addIfDifferent" with "where = before"' '
-	git config trailer.ack.ifExists "addIfDifferent" &&
-	git config trailer.ack.where "before" &&
+	test_config trailer.ack.ifExists "addIfDifferent" &&
+	test_config trailer.ack.key "Acked-by= " &&
+	test_config trailer.ack.where "before" &&
+	test_config trailer.bug.key "Bug #" &&
+	test_config trailer.bug.where "before" &&
+	test_config trailer.review.key "Reviewed-by:" &&
+	test_config trailer.ifexists "addIfDifferent" &&
+	test_config trailer.separators ":=#" &&
 	cat complex_message_body >expected &&
 	sed -e "s/ Z\$/ /" >>expected <<-\EOF &&
 		Bug #42
@@ -887,8 +1064,14 @@ test_expect_success 'using "ifExists = addIfDifferent" with "where = before"' '
 '
 
 test_expect_success 'using "ifExists = addIfDifferentNeighbor" with "where = end"' '
-	git config trailer.ack.ifExists "addIfDifferentNeighbor" &&
-	git config trailer.ack.where "end" &&
+	test_config trailer.ack.ifExists "addIfDifferentNeighbor" &&
+	test_config trailer.ack.key "Acked-by= " &&
+	test_config trailer.ack.where "end" &&
+	test_config trailer.bug.key "Bug #" &&
+	test_config trailer.bug.where "before" &&
+	test_config trailer.review.key "Reviewed-by:" &&
+	test_config trailer.ifexists "addIfDifferent" &&
+	test_config trailer.separators ":=#" &&
 	cat complex_message_body >expected &&
 	sed -e "s/ Z\$/ /" >>expected <<-\EOF &&
 		Bug #42
@@ -910,8 +1093,14 @@ test_expect_success 'using "ifExists = addIfDifferentNeighbor" with "where = end
 '
 
 test_expect_success 'using "ifExists = addIfDifferentNeighbor"  with "where = after"' '
-	git config trailer.ack.ifExists "addIfDifferentNeighbor" &&
-	git config trailer.ack.where "after" &&
+	test_config trailer.ack.ifExists "addIfDifferentNeighbor" &&
+	test_config trailer.ack.key "Acked-by= " &&
+	test_config trailer.ack.where "after" &&
+	test_config trailer.bug.key "Bug #" &&
+	test_config trailer.bug.where "before" &&
+	test_config trailer.review.key "Reviewed-by:" &&
+	test_config trailer.ifexists "addIfDifferent" &&
+	test_config trailer.separators ":=#" &&
 	cat complex_message_body >expected &&
 	sed -e "s/ Z\$/ /" >>expected <<-\EOF &&
 		Bug #42
@@ -932,7 +1121,11 @@ test_expect_success 'using "ifExists = addIfDifferentNeighbor"  with "where = af
 '
 
 test_expect_success 'using "ifExists = addIfDifferentNeighbor" and --trim-empty' '
-	git config trailer.ack.ifExists "addIfDifferentNeighbor" &&
+	test_config trailer.ack.ifExists "addIfDifferentNeighbor" &&
+	test_config trailer.ack.key "Acked-by= " &&
+	test_config trailer.bug.key "Bug #" &&
+	test_config trailer.bug.where "before" &&
+	test_config trailer.separators ":=#" &&
 	cat complex_message_body >expected &&
 	cat >>expected <<-\EOF &&
 		Bug #42
@@ -948,8 +1141,14 @@ test_expect_success 'using "ifExists = addIfDifferentNeighbor" and --trim-empty'
 '
 
 test_expect_success 'using "ifExists = add" with "where = end"' '
-	git config trailer.ack.ifExists "add" &&
-	git config trailer.ack.where "end" &&
+	test_config trailer.ack.ifExists "add" &&
+	test_config trailer.ack.key "Acked-by= " &&
+	test_config trailer.ack.where "end" &&
+	test_config trailer.bug.key "Bug #" &&
+	test_config trailer.bug.where "before" &&
+	test_config trailer.review.key "Reviewed-by:" &&
+	test_config trailer.ifexists "addIfDifferent" &&
+	test_config trailer.separators ":=#" &&
 	cat complex_message_body >expected &&
 	sed -e "s/ Z\$/ /" >>expected <<-\EOF &&
 		Bug #42
@@ -973,8 +1172,14 @@ test_expect_success 'using "ifExists = add" with "where = end"' '
 '
 
 test_expect_success 'using "ifExists = add" with "where = after"' '
-	git config trailer.ack.ifExists "add" &&
-	git config trailer.ack.where "after" &&
+	test_config trailer.ack.ifExists "add" &&
+	test_config trailer.ack.key "Acked-by= " &&
+	test_config trailer.ack.where "after" &&
+	test_config trailer.bug.key "Bug #" &&
+	test_config trailer.bug.where "before" &&
+	test_config trailer.review.key "Reviewed-by:" &&
+	test_config trailer.ifexists "addIfDifferent" &&
+	test_config trailer.separators ":=#" &&
 	cat complex_message_body >expected &&
 	sed -e "s/ Z\$/ /" >>expected <<-\EOF &&
 		Bug #42
@@ -995,8 +1200,15 @@ test_expect_success 'using "ifExists = add" with "where = after"' '
 '
 
 test_expect_success 'overriding configuration with "--if-exists replace"' '
-	git config trailer.fix.key "Fixes: " &&
-	git config trailer.fix.ifExists "add" &&
+	test_config trailer.fix.key "Fixes: " &&
+	test_config trailer.fix.ifExists "add" &&
+	test_config trailer.ack.key "Acked-by= " &&
+	test_config trailer.ack.where "after" &&
+	test_config trailer.bug.key "Bug #" &&
+	test_config trailer.bug.where "before" &&
+	test_config trailer.review.key "Reviewed-by:" &&
+	test_config trailer.review.where "before" &&
+	test_config trailer.separators ":=#" &&
 	cat complex_message_body >expected &&
 	sed -e "s/ Z\$/ /" >>expected <<-\EOF &&
 		Bug #42
@@ -1011,9 +1223,66 @@ test_expect_success 'overriding configuration with "--if-exists replace"' '
 	test_cmp expected actual
 '
 
+# "trailer.ifexists" is set to "doNothing", so using "--no-if-exists" defaults
+# to this "doNothing" behavior. So the "Fixes: 53" trailer does not get added.
+test_expect_success 'using "--if-exists replace" with "--no-if-exists" defaults to configuration' '
+	test_config trailer.ifexists "doNothing" &&
+	cat complex_message_body >expected &&
+	sed -e "s/ Z\$/ /" >>expected <<-\EOF &&
+		Fixes: Z
+		Acked-by: Z
+		Reviewed-by: Z
+		Signed-off-by: Z
+	EOF
+	git interpret-trailers --if-exists replace --no-if-exists --trailer "Fixes: 53" \
+		<complex_message >actual &&
+	test_cmp expected actual
+'
+
+# No "ifexists" configuration is set, so using "--no-if-exists" makes it default
+# to addIfDifferentNeighbor. Because we do have a different neighbor "Fixes: 53"
+# (because it got added by overriding with "--if-exists replace" earlier in the
+# arguments list), we add "Signed-off-by: addme".
+test_expect_success 'using "--no-if-exists" defaults to hardcoded default if nothing configured' '
+	cat complex_message_body >expected &&
+	sed -e "s/ Z\$/ /" >>expected <<-\EOF &&
+		Acked-by: Z
+		Reviewed-by: Z
+		Signed-off-by: Z
+		Fixes: 53
+		Signed-off-by: addme
+	EOF
+	git interpret-trailers --if-exists replace --trailer "Fixes: 53" --no-if-exists \
+		--trailer "Signed-off-by: addme" <complex_message >actual &&
+	test_cmp expected actual
+'
+
+# The second "Fixes: 53" trailer is discarded, because the "--no-if-exists" here
+# makes us default to addIfDifferentNeighbor, and we already added the "Fixes:
+# 53" trailer earlier in the argument list.
+test_expect_success 'using "--no-if-exists" defaults to hardcoded default if nothing configured (no addition)' '
+	cat complex_message_body >expected &&
+	sed -e "s/ Z\$/ /" >>expected <<-\EOF &&
+		Acked-by: Z
+		Reviewed-by: Z
+		Signed-off-by: Z
+		Fixes: 53
+	EOF
+	git interpret-trailers --if-exists replace --trailer "Fixes: 53" --no-if-exists \
+		--trailer "Fixes: 53" <complex_message >actual &&
+	test_cmp expected actual
+'
+
 test_expect_success 'using "ifExists = replace"' '
-	git config trailer.fix.key "Fixes: " &&
-	git config trailer.fix.ifExists "replace" &&
+	test_config trailer.fix.key "Fixes: " &&
+	test_config trailer.fix.ifExists "replace" &&
+	test_config trailer.ack.key "Acked-by= " &&
+	test_config trailer.ack.where "after" &&
+	test_config trailer.bug.key "Bug #" &&
+	test_config trailer.bug.where "before" &&
+	test_config trailer.review.key "Reviewed-by:" &&
+	test_config trailer.ifexists "addIfDifferent" &&
+	test_config trailer.separators ":=#" &&
 	cat complex_message_body >expected &&
 	sed -e "s/ Z\$/ /" >>expected <<-\EOF &&
 		Bug #42
@@ -1032,7 +1301,16 @@ test_expect_success 'using "ifExists = replace"' '
 '
 
 test_expect_success 'using "ifExists = replace" with "where = after"' '
-	git config trailer.fix.where "after" &&
+	test_config trailer.ack.key "Acked-by= " &&
+	test_config trailer.ack.where "after" &&
+	test_config trailer.bug.key "Bug #" &&
+	test_config trailer.bug.where "before" &&
+	test_config trailer.fix.key "Fixes: " &&
+	test_config trailer.fix.ifExists "replace" &&
+	test_config trailer.fix.where "after" &&
+	test_config trailer.review.key "Reviewed-by:" &&
+	test_config trailer.ifexists "addIfDifferent" &&
+	test_config trailer.separators ":=#" &&
 	cat complex_message_body >expected &&
 	sed -e "s/ Z\$/ /" >>expected <<-\EOF &&
 		Bug #42
@@ -1051,7 +1329,15 @@ test_expect_success 'using "ifExists = replace" with "where = after"' '
 '
 
 test_expect_success 'using "ifExists = doNothing"' '
-	git config trailer.fix.ifExists "doNothing" &&
+	test_config trailer.fix.ifExists "doNothing" &&
+	test_config trailer.ack.key "Acked-by= " &&
+	test_config trailer.ack.where "after" &&
+	test_config trailer.bug.key "Bug #" &&
+	test_config trailer.bug.where "before" &&
+	test_config trailer.fix.key "Fixes: " &&
+	test_config trailer.review.key "Reviewed-by:" &&
+	test_config trailer.ifexists "addIfDifferent" &&
+	test_config trailer.separators ":=#" &&
 	cat complex_message_body >expected &&
 	sed -e "s/ Z\$/ /" >>expected <<-\EOF &&
 		Bug #42
@@ -1070,8 +1356,17 @@ test_expect_success 'using "ifExists = doNothing"' '
 '
 
 test_expect_success 'the default is "ifMissing = add"' '
-	git config trailer.cc.key "Cc: " &&
-	git config trailer.cc.where "before" &&
+	test_config trailer.ack.key "Acked-by= " &&
+	test_config trailer.ack.where "after" &&
+	test_config trailer.bug.key "Bug #" &&
+	test_config trailer.bug.where "before" &&
+	test_config trailer.cc.key "Cc: " &&
+	test_config trailer.cc.where "before" &&
+	test_config trailer.fix.key "Fixes: " &&
+	test_config trailer.fix.ifExists "doNothing" &&
+	test_config trailer.review.key "Reviewed-by:" &&
+	test_config trailer.ifexists "addIfDifferent" &&
+	test_config trailer.separators ":=#" &&
 	cat complex_message_body >expected &&
 	sed -e "s/ Z\$/ /" >>expected <<-\EOF &&
 		Bug #42
@@ -1091,7 +1386,14 @@ test_expect_success 'the default is "ifMissing = add"' '
 '
 
 test_expect_success 'overriding configuration with "--if-missing doNothing"' '
-	git config trailer.ifmissing "add" &&
+	test_config trailer.ack.key "Acked-by= " &&
+	test_config trailer.ack.where "after" &&
+	test_config trailer.fix.key "Fixes: " &&
+	test_config trailer.fix.ifExists "doNothing" &&
+	test_config trailer.review.key "Reviewed-by:" &&
+	test_config trailer.ifexists "addIfDifferent" &&
+	test_config trailer.ifmissing "add" &&
+	test_config trailer.separators ":=" &&
 	cat complex_message_body >expected &&
 	sed -e "s/ Z\$/ /" >>expected <<-\EOF &&
 		Fixes: Z
@@ -1110,7 +1412,13 @@ test_expect_success 'overriding configuration with "--if-missing doNothing"' '
 '
 
 test_expect_success 'when default "ifMissing" is "doNothing"' '
-	git config trailer.ifmissing "doNothing" &&
+	test_config trailer.ack.key "Acked-by= " &&
+	test_config trailer.ack.where "after" &&
+	test_config trailer.fix.ifExists "doNothing" &&
+	test_config trailer.review.key "Reviewed-by:" &&
+	test_config trailer.ifexists "addIfDifferent" &&
+	test_config trailer.ifmissing "doNothing" &&
+	test_config trailer.separators ":=" &&
 	cat complex_message_body >expected &&
 	sed -e "s/ Z\$/ /" >>expected <<-\EOF &&
 		Fixes: Z
@@ -1124,14 +1432,21 @@ test_expect_success 'when default "ifMissing" is "doNothing"' '
 		--trailer "cc=Linus" --trailer "ack: Junio" \
 		--trailer "fix=22" --trailer "bug: 42" --trailer "ack: Peff" \
 		<complex_message >actual &&
-	test_cmp expected actual &&
-	git config trailer.ifmissing "add"
+	test_cmp expected actual
 '
 
 test_expect_success 'using "ifMissing = add" with "where = end"' '
-	git config trailer.cc.key "Cc: " &&
-	git config trailer.cc.where "end" &&
-	git config trailer.cc.ifMissing "add" &&
+	test_config trailer.ack.key "Acked-by= " &&
+	test_config trailer.ack.where "after" &&
+	test_config trailer.bug.key "Bug #" &&
+	test_config trailer.bug.where "before" &&
+	test_config trailer.cc.key "Cc: " &&
+	test_config trailer.cc.ifMissing "add" &&
+	test_config trailer.cc.where "end" &&
+	test_config trailer.fix.ifExists "doNothing" &&
+	test_config trailer.review.key "Reviewed-by:" &&
+	test_config trailer.ifexists "addIfDifferent" &&
+	test_config trailer.separators ":=#" &&
 	cat complex_message_body >expected &&
 	sed -e "s/ Z\$/ /" >>expected <<-\EOF &&
 		Bug #42
@@ -1151,9 +1466,17 @@ test_expect_success 'using "ifMissing = add" with "where = end"' '
 '
 
 test_expect_success 'using "ifMissing = add" with "where = before"' '
-	git config trailer.cc.key "Cc: " &&
-	git config trailer.cc.where "before" &&
-	git config trailer.cc.ifMissing "add" &&
+	test_config trailer.ack.key "Acked-by= " &&
+	test_config trailer.ack.where "after" &&
+	test_config trailer.bug.key "Bug #" &&
+	test_config trailer.bug.where "before" &&
+	test_config trailer.cc.key "Cc: " &&
+	test_config trailer.cc.ifMissing "add" &&
+	test_config trailer.cc.where "before" &&
+	test_config trailer.fix.ifExists "doNothing" &&
+	test_config trailer.review.key "Reviewed-by:" &&
+	test_config trailer.ifexists "addIfDifferent" &&
+	test_config trailer.separators ":=#" &&
 	cat complex_message_body >expected &&
 	sed -e "s/ Z\$/ /" >>expected <<-\EOF &&
 		Cc: Linus
@@ -1173,7 +1496,15 @@ test_expect_success 'using "ifMissing = add" with "where = before"' '
 '
 
 test_expect_success 'using "ifMissing = doNothing"' '
-	git config trailer.cc.ifMissing "doNothing" &&
+	test_config trailer.ack.key "Acked-by= " &&
+	test_config trailer.ack.where "after" &&
+	test_config trailer.bug.key "Bug #" &&
+	test_config trailer.bug.where "before" &&
+	test_config trailer.cc.ifMissing "doNothing" &&
+	test_config trailer.fix.ifExists "doNothing" &&
+	test_config trailer.review.key "Reviewed-by:" &&
+	test_config trailer.ifexists "addIfDifferent" &&
+	test_config trailer.separators ":=#" &&
 	cat complex_message_body >expected &&
 	sed -e "s/ Z\$/ /" >>expected <<-\EOF &&
 		Bug #42
@@ -1191,9 +1522,50 @@ test_expect_success 'using "ifMissing = doNothing"' '
 	test_cmp expected actual
 '
 
+# Ignore the "IgnoredTrailer" because of "--if-missing doNothing", but also
+# ignore the "StillIgnoredTrailer" because we set "trailer.ifMissing" to
+# "doNothing" in configuration.
+test_expect_success 'using "--no-if-missing" defaults to configuration' '
+	test_config trailer.ifMissing "doNothing" &&
+	cat complex_message_body >expected &&
+	sed -e "s/ Z\$/ /" >>expected <<-\EOF &&
+			Fixes: Z
+			Acked-by: Z
+			Reviewed-by: Z
+			Signed-off-by: Z
+	EOF
+	git interpret-trailers --if-missing doNothing --trailer "IgnoredTrailer: ignoreme" --no-if-missing \
+			--trailer "StillIgnoredTrailer: ignoreme" <complex_message >actual &&
+	test_cmp expected actual
+'
+
+# Add the "AddedTrailer" because the "--no-if-missing" clears the "--if-missing
+# doNothing" from earlier in the argument list.
+test_expect_success 'using "--no-if-missing" defaults to hardcoded default if nothing configured' '
+	cat complex_message_body >expected &&
+	sed -e "s/ Z\$/ /" >>expected <<-\EOF &&
+			Fixes: Z
+			Acked-by: Z
+			Reviewed-by: Z
+			Signed-off-by: Z
+			AddedTrailer: addme
+	EOF
+	git interpret-trailers --if-missing doNothing --trailer "IgnoredTrailer: ignoreme" --no-if-missing \
+			--trailer "AddedTrailer: addme" <complex_message >actual &&
+	test_cmp expected actual
+'
+
 test_expect_success 'default "where" is now "after"' '
 	git config trailer.where "after" &&
-	git config --unset trailer.ack.where &&
+	test_config trailer.ack.ifExists "add" &&
+	test_config trailer.ack.key "Acked-by= " &&
+	test_config trailer.ack.where "after" &&
+	test_config trailer.bug.key "Bug #" &&
+	test_config trailer.bug.where "before" &&
+	test_config trailer.fix.ifExists "doNothing" &&
+	test_config trailer.review.key "Reviewed-by:" &&
+	test_config trailer.ifexists "addIfDifferent" &&
+	test_config trailer.separators ":=#" &&
 	cat complex_message_body >expected &&
 	sed -e "s/ Z\$/ /" >>expected <<-\EOF &&
 		Bug #42
@@ -1217,10 +1589,15 @@ test_expect_success 'default "where" is now "after"' '
 '
 
 test_expect_success 'with simple command' '
-	git config trailer.sign.key "Signed-off-by: " &&
-	git config trailer.sign.where "after" &&
-	git config trailer.sign.ifExists "addIfDifferentNeighbor" &&
-	git config trailer.sign.command "echo \"A U Thor <author@example.com>\"" &&
+	test_config trailer.ack.key "Acked-by= " &&
+	test_config trailer.fix.ifExists "doNothing" &&
+	test_config trailer.review.key "Reviewed-by:" &&
+	test_config trailer.sign.command "echo \"A U Thor <author@example.com>\"" &&
+	test_config trailer.sign.key "Signed-off-by: " &&
+	test_config trailer.sign.ifExists "addIfDifferentNeighbor" &&
+	test_config trailer.sign.where "after" &&
+	test_config trailer.ifexists "addIfDifferent" &&
+	test_config trailer.separators ":=" &&
 	cat complex_message_body >expected &&
 	sed -e "s/ Z\$/ /" >>expected <<-\EOF &&
 		Fixes: Z
@@ -1235,8 +1612,14 @@ test_expect_success 'with simple command' '
 '
 
 test_expect_success 'with command using committer information' '
-	git config trailer.sign.ifExists "addIfDifferent" &&
-	git config trailer.sign.command "echo \"\$GIT_COMMITTER_NAME <\$GIT_COMMITTER_EMAIL>\"" &&
+	test_config trailer.ack.key "Acked-by= " &&
+	test_config trailer.fix.ifExists "doNothing" &&
+	test_config trailer.review.key "Reviewed-by:" &&
+	test_config trailer.sign.command "echo \"\$GIT_COMMITTER_NAME <\$GIT_COMMITTER_EMAIL>\"" &&
+	test_config trailer.sign.key "Signed-off-by: " &&
+	test_config trailer.sign.ifExists "addIfDifferent" &&
+	test_config trailer.ifexists "addIfDifferent" &&
+	test_config trailer.separators ":=" &&
 	cat complex_message_body >expected &&
 	sed -e "s/ Z\$/ /" >>expected <<-\EOF &&
 		Fixes: Z
@@ -1251,10 +1634,15 @@ test_expect_success 'with command using committer information' '
 '
 
 test_expect_success 'with command using author information' '
-	git config trailer.sign.key "Signed-off-by: " &&
-	git config trailer.sign.where "after" &&
-	git config trailer.sign.ifExists "addIfDifferentNeighbor" &&
-	git config trailer.sign.command "echo \"\$GIT_AUTHOR_NAME <\$GIT_AUTHOR_EMAIL>\"" &&
+	test_config trailer.ack.key "Acked-by= " &&
+	test_config trailer.fix.ifExists "doNothing" &&
+	test_config trailer.review.key "Reviewed-by:" &&
+	test_config trailer.sign.command "echo \"\$GIT_AUTHOR_NAME <\$GIT_AUTHOR_EMAIL>\"" &&
+	test_config trailer.sign.key "Signed-off-by: " &&
+	test_config trailer.sign.ifExists "addIfDifferentNeighbor" &&
+	test_config trailer.sign.where "after" &&
+	test_config trailer.ifexists "addIfDifferent" &&
+	test_config trailer.separators ":=" &&
 	cat complex_message_body >expected &&
 	sed -e "s/ Z\$/ /" >>expected <<-\EOF &&
 		Fixes: Z
@@ -1274,9 +1662,45 @@ test_expect_success 'setup a commit' '
 	git commit -m "Add file a.txt"
 '
 
+test_expect_success 'cmd takes precedence over command' '
+	test_config trailer.ack.key "Acked-by= " &&
+	test_config trailer.fix.command "git log -1 --oneline --format=\"%h (%s)\" \
+		--abbrev-commit --abbrev=14 \$ARG" &&
+	test_config trailer.fix.cmd "test -n \"\$1\" && git log -1 --oneline --format=\"%h (%aN)\" \
+	--abbrev-commit --abbrev=14 \"\$1\" || true" &&
+	test_config trailer.fix.key "Fixes: " &&
+	test_config trailer.fix.ifExists "replace" &&
+	test_config trailer.fix.where "after" &&
+	test_config trailer.review.key "Reviewed-by:" &&
+	test_config trailer.sign.command "echo \"\$GIT_AUTHOR_NAME <\$GIT_AUTHOR_EMAIL>\"" &&
+	test_config trailer.sign.key "Signed-off-by: " &&
+	test_config trailer.ifexists "addIfDifferent" &&
+	test_config trailer.separators ":=" &&
+	FIXED=$(git log -1 --oneline --format="%h (%aN)" --abbrev-commit --abbrev=14 HEAD) &&
+	cat complex_message_body >expected2 &&
+	sed -e "s/ Z\$/ /" >>expected2 <<-EOF &&
+		Fixes: $FIXED
+		Acked-by= Z
+		Reviewed-by:
+		Signed-off-by: Z
+		Signed-off-by: A U Thor <author@example.com>
+	EOF
+	git interpret-trailers --trailer "review:" --trailer "fix=HEAD" \
+		<complex_message >actual2 &&
+	test_cmp expected2 actual2
+'
+
 test_expect_success 'with command using $ARG' '
-	git config trailer.fix.ifExists "replace" &&
-	git config trailer.fix.command "git log -1 --oneline --format=\"%h (%s)\" --abbrev-commit --abbrev=14 \$ARG" &&
+	test_config trailer.ack.key "Acked-by= " &&
+	test_config trailer.fix.command "git log -1 --oneline --format=\"%h (%s)\" --abbrev-commit --abbrev=14 \$ARG" &&
+	test_config trailer.fix.key "Fixes: " &&
+	test_config trailer.fix.ifExists "replace" &&
+	test_config trailer.fix.where "after" &&
+	test_config trailer.review.key "Reviewed-by:" &&
+	test_config trailer.sign.command "echo \"\$GIT_AUTHOR_NAME <\$GIT_AUTHOR_EMAIL>\"" &&
+	test_config trailer.sign.key "Signed-off-by: " &&
+	test_config trailer.ifexists "addIfDifferent" &&
+	test_config trailer.separators ":=" &&
 	FIXED=$(git log -1 --oneline --format="%h (%s)" --abbrev-commit --abbrev=14 HEAD) &&
 	cat complex_message_body >expected &&
 	sed -e "s/ Z\$/ /" >>expected <<-EOF &&
@@ -1292,8 +1716,16 @@ test_expect_success 'with command using $ARG' '
 '
 
 test_expect_success 'with failing command using $ARG' '
-	git config trailer.fix.ifExists "replace" &&
-	git config trailer.fix.command "false \$ARG" &&
+	test_config trailer.ack.key "Acked-by= " &&
+	test_config trailer.fix.command "false \$ARG" &&
+	test_config trailer.fix.key "Fixes: " &&
+	test_config trailer.fix.ifExists "replace" &&
+	test_config trailer.fix.where "after" &&
+	test_config trailer.review.key "Reviewed-by:" &&
+	test_config trailer.sign.command "echo \"\$GIT_AUTHOR_NAME <\$GIT_AUTHOR_EMAIL>\"" &&
+	test_config trailer.sign.key "Signed-off-by: " &&
+	test_config trailer.ifexists "addIfDifferent" &&
+	test_config trailer.separators ":=" &&
 	cat complex_message_body >expected &&
 	sed -e "s/ Z\$/ /" >>expected <<-EOF &&
 		Fixes: Z
@@ -1308,7 +1740,9 @@ test_expect_success 'with failing command using $ARG' '
 '
 
 test_expect_success 'with empty tokens' '
-	git config --unset trailer.fix.command &&
+	test_config trailer.sign.command "echo \"\$GIT_AUTHOR_NAME <\$GIT_AUTHOR_EMAIL>\"" &&
+	test_config trailer.sign.key "Signed-off-by: " &&
+	test_config trailer.ifexists "addIfDifferent" &&
 	cat >expected <<-EOF &&
 
 		Signed-off-by: A U Thor <author@example.com>
@@ -1319,7 +1753,8 @@ test_expect_success 'with empty tokens' '
 '
 
 test_expect_success 'with command but no key' '
-	git config --unset trailer.sign.key &&
+	test_config trailer.sign.command "echo \"\$GIT_AUTHOR_NAME <\$GIT_AUTHOR_EMAIL>\"" &&
+	test_config trailer.ifexists "addIfDifferent" &&
 	cat >expected <<-EOF &&
 
 		sign: A U Thor <author@example.com>
@@ -1330,7 +1765,9 @@ test_expect_success 'with command but no key' '
 '
 
 test_expect_success 'with no command and no key' '
-	git config --unset trailer.review.key &&
+	test_config trailer.review.where "before" &&
+	test_config trailer.sign.command "echo \"\$GIT_AUTHOR_NAME <\$GIT_AUTHOR_EMAIL>\"" &&
+	test_config trailer.ifexists "addIfDifferent" &&
 	cat >expected <<-EOF &&
 
 		review: Junio
@@ -1342,6 +1779,8 @@ test_expect_success 'with no command and no key' '
 '
 
 test_expect_success 'with cut line' '
+	test_config trailer.review.where "before" &&
+	test_config trailer.sign.command "echo \"\$GIT_AUTHOR_NAME <\$GIT_AUTHOR_EMAIL>\"" &&
 	cat >expected <<-\EOF &&
 		my subject
 
@@ -1359,7 +1798,8 @@ test_expect_success 'with cut line' '
 '
 
 test_expect_success 'only trailers' '
-	git config trailer.sign.command "echo config-value" &&
+	test_config trailer.sign.command "echo config-value" &&
+	test_config trailer.ifexists "addIfDifferent" &&
 	cat >expected <<-\EOF &&
 		existing: existing-value
 		sign: config-value
@@ -1378,7 +1818,7 @@ test_expect_success 'only trailers' '
 '
 
 test_expect_success 'only-trailers omits non-trailer in middle of block' '
-	git config trailer.sign.command "echo config-value" &&
+	test_config trailer.sign.command "echo config-value" &&
 	cat >expected <<-\EOF &&
 		Signed-off-by: nobody <nobody@nowhere>
 		Signed-off-by: somebody <somebody@somewhere>
@@ -1398,7 +1838,7 @@ test_expect_success 'only-trailers omits non-trailer in middle of block' '
 '
 
 test_expect_success 'only input' '
-	git config trailer.sign.command "echo config-value" &&
+	test_config trailer.sign.command "echo config-value" &&
 	cat >expected <<-\EOF &&
 		existing: existing-value
 	EOF
@@ -1476,4 +1916,37 @@ test_expect_success 'suppress --- handling' '
 	test_cmp expected actual
 '
 
+test_expect_success 'suppressing --- does not disable cut-line handling' '
+	echo "real-trailer: before the cut" >expected &&
+
+	git interpret-trailers --parse --no-divider >actual <<-\EOF &&
+	subject
+
+	This input has a cut-line in it; we should stop parsing when we see it
+	and consider only trailers before that line.
+
+	real-trailer: before the cut
+
+	# ------------------------ >8 ------------------------
+	# Nothing below this line counts as part of the commit message.
+	not-a-trailer: too late
+	EOF
+
+	test_cmp expected actual
+'
+
+test_expect_success 'handling of --- lines in conjunction with cut-lines' '
+	echo "my-trailer: here" >expected &&
+
+	git interpret-trailers --parse >actual <<-\EOF &&
+	subject
+
+	my-trailer: here
+	---
+	# ------------------------ >8 ------------------------
+	EOF
+
+	test_cmp expected actual
+'
+
 test_done
diff --git a/t/t7514-commit-patch.sh b/t/t7514-commit-patch.sh
index 998a210..b4de10a 100755
--- a/t/t7514-commit-patch.sh
+++ b/t/t7514-commit-patch.sh
@@ -3,12 +3,6 @@
 test_description='hunk edit with "commit -p -m"'
 . ./test-lib.sh
 
-if ! test_have_prereq PERL
-then
-	skip_all="skipping '$test_description' tests, perl not available"
-	test_done
-fi
-
 test_expect_success 'setup (initial)' '
 	echo line1 >file &&
 	git add file &&
diff --git a/t/t7515-status-symlinks.sh b/t/t7515-status-symlinks.sh
index 9f989be..e3d6bb6 100755
--- a/t/t7515-status-symlinks.sh
+++ b/t/t7515-status-symlinks.sh
@@ -2,6 +2,7 @@
 
 test_description='git status and symlinks'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
diff --git a/t/t7516-commit-races.sh b/t/t7516-commit-races.sh
index f2ce14e..bb95f09 100755
--- a/t/t7516-commit-races.sh
+++ b/t/t7516-commit-races.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='git commit races'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'race to create orphan commit' '
@@ -10,7 +12,8 @@ test_expect_success 'race to create orphan commit' '
 	test_must_fail env EDITOR=./hare-editor git commit --allow-empty -m tortoise -e &&
 	git show -s --pretty=format:%s >subject &&
 	grep hare subject &&
-	test -z "$(git show -s --pretty=format:%P)"
+	git show -s --pretty=format:%P >out &&
+	test_must_be_empty out
 '
 
 test_expect_success 'race to create non-orphan commit' '
diff --git a/t/t7517-per-repo-email.sh b/t/t7517-per-repo-email.sh
index b2401ce..efc6496 100755
--- a/t/t7517-per-repo-email.sh
+++ b/t/t7517-per-repo-email.sh
@@ -6,6 +6,10 @@
 
 test_description='per-repo forced setting of email address'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup a likely user.useConfigOnly use case' '
@@ -47,24 +51,24 @@ test_expect_success 'set up rebase scenarios' '
 
 test_expect_success 'fast-forward rebase does not care about ident' '
 	git checkout -B tmp side-without-commit &&
-	git rebase master
+	git rebase main
 '
 
 test_expect_success 'non-fast-forward rebase refuses to write commits' '
 	test_when_finished "git rebase --abort || true" &&
 	git checkout -B tmp side-with-commit &&
-	test_must_fail git rebase master
+	test_must_fail git rebase main
 '
 
 test_expect_success 'fast-forward rebase does not care about ident (interactive)' '
 	git checkout -B tmp side-without-commit &&
-	git rebase -i master
+	git rebase -i main
 '
 
 test_expect_success 'non-fast-forward rebase refuses to write commits (interactive)' '
 	test_when_finished "git rebase --abort || true" &&
 	git checkout -B tmp side-with-commit &&
-	test_must_fail git rebase -i master
+	test_must_fail git rebase -i main
 '
 
 test_expect_success 'noop interactive rebase does not care about ident' '
@@ -72,19 +76,6 @@ test_expect_success 'noop interactive rebase does not care about ident' '
 	git rebase -i HEAD^
 '
 
-test_expect_success REBASE_P \
-	'fast-forward rebase does not care about ident (preserve)' '
-	git checkout -B tmp side-without-commit &&
-	git rebase -p master
-'
-
-test_expect_success REBASE_P \
-	'non-fast-forward rebase refuses to write commits (preserve)' '
-	test_when_finished "git rebase --abort || true" &&
-	git checkout -B tmp side-with-commit &&
-	test_must_fail git rebase -p master
-'
-
 test_expect_success 'author.name overrides user.name' '
 	test_config user.name user &&
 	test_config user.email user@example.com &&
diff --git a/t/t7518-ident-corner-cases.sh b/t/t7518-ident-corner-cases.sh
index b22f631..b37de0a 100755
--- a/t/t7518-ident-corner-cases.sh
+++ b/t/t7518-ident-corner-cases.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='corner cases in ident strings'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # confirm that we do not segfault _and_ that we do not say "(null)", as
@@ -13,15 +15,24 @@ test_expect_success 'empty name and missing email' '
 		sane_unset GIT_AUTHOR_EMAIL &&
 		GIT_AUTHOR_NAME= &&
 		test_must_fail git commit --allow-empty -m foo 2>err &&
-		test_i18ngrep ! null err
+		test_grep ! "(null)" err
 	)
 '
 
 test_expect_success 'commit rejects all-crud name' '
-	test_must_fail env GIT_AUTHOR_NAME=" .;<>" \
+	test_must_fail env GIT_AUTHOR_NAME=" ,;<>" \
 		git commit --allow-empty -m foo
 '
 
+test_expect_success 'commit does not strip trailing dot' '
+	author_name="Pat Doe Jr." &&
+	env GIT_AUTHOR_NAME="$author_name" \
+		git commit --allow-empty -m foo &&
+	git log -1 --format=%an >actual &&
+	echo "$author_name" >expected &&
+	test_cmp actual expected
+'
+
 # We must test the actual error message here, as an unwanted
 # auto-detection could fail for other reasons.
 test_expect_success 'empty configured name does not auto-detect' '
@@ -29,7 +40,18 @@ test_expect_success 'empty configured name does not auto-detect' '
 		sane_unset GIT_AUTHOR_NAME &&
 		test_must_fail \
 			git -c user.name= commit --allow-empty -m foo 2>err &&
-		test_i18ngrep "empty ident name" err
+		test_grep "empty ident name" err &&
+		test_grep "Author identity unknown" err
+	)
+'
+
+test_expect_success 'empty configured name does not auto-detect for committer' '
+	(
+		sane_unset GIT_COMMITTER_NAME &&
+		test_must_fail \
+			git -c user.name= commit --allow-empty -m foo 2>err &&
+		test_grep "empty ident name" err &&
+		test_grep "Committer identity unknown" err
 	)
 '
 
diff --git a/t/t7519-status-fsmonitor.sh b/t/t7519-status-fsmonitor.sh
index fbfdcca..7ee69ec 100755
--- a/t/t7519-status-fsmonitor.sh
+++ b/t/t7519-status-fsmonitor.sh
@@ -26,7 +26,7 @@ dirty_repo () {
 }
 
 write_integration_script () {
-	write_script .git/hooks/fsmonitor-test<<-\EOF
+	test_hook --setup --clobber fsmonitor-test<<-\EOF
 	if test "$#" -ne 2
 	then
 		echo "$0: exactly 2 arguments expected"
@@ -55,8 +55,39 @@ test_lazy_prereq UNTRACKED_CACHE '
 	test $ret -ne 1
 '
 
+# Test that we detect and disallow repos that are incompatible with FSMonitor.
+test_expect_success 'incompatible bare repo' '
+	test_when_finished "rm -rf ./bare-clone actual expect" &&
+	git init --bare bare-clone &&
+
+	test_must_fail \
+		git -C ./bare-clone -c core.fsmonitor=foo \
+			update-index --fsmonitor 2>actual &&
+	grep "bare repository .* is incompatible with fsmonitor" actual &&
+
+	test_must_fail \
+		git -C ./bare-clone -c core.fsmonitor=true \
+			update-index --fsmonitor 2>actual &&
+	grep "bare repository .* is incompatible with fsmonitor" actual
+'
+
+test_expect_success FSMONITOR_DAEMON 'run fsmonitor-daemon in bare repo' '
+	test_when_finished "rm -rf ./bare-clone actual" &&
+	git init --bare bare-clone &&
+	test_must_fail git -C ./bare-clone fsmonitor--daemon run 2>actual &&
+	grep "bare repository .* is incompatible with fsmonitor" actual
+'
+
+test_expect_success MINGW,FSMONITOR_DAEMON 'run fsmonitor-daemon in virtual repo' '
+	test_when_finished "rm -rf ./fake-virtual-clone actual" &&
+	git init fake-virtual-clone &&
+	test_must_fail git -C ./fake-virtual-clone \
+			   -c core.virtualfilesystem=true \
+			   fsmonitor--daemon run 2>actual &&
+	grep "virtual repository .* is incompatible with fsmonitor" actual
+'
+
 test_expect_success 'setup' '
-	mkdir -p .git/hooks &&
 	: >tracked &&
 	: >modified &&
 	mkdir dir1 &&
@@ -73,6 +104,7 @@ test_expect_success 'setup' '
 	expect*
 	actual*
 	marker*
+	trace2*
 	EOF
 '
 
@@ -107,7 +139,7 @@ EOF
 
 # test that "update-index --fsmonitor-valid" sets the fsmonitor valid bit
 test_expect_success 'update-index --fsmonitor-valid" sets the fsmonitor valid bit' '
-	write_script .git/hooks/fsmonitor-test<<-\EOF &&
+	test_hook fsmonitor-test<<-\EOF &&
 		printf "last_update_token\0"
 	EOF
 	git update-index --fsmonitor &&
@@ -168,7 +200,7 @@ EOF
 
 # test that newly added files are marked valid
 test_expect_success 'newly added files are marked valid' '
-	write_script .git/hooks/fsmonitor-test<<-\EOF &&
+	test_hook --setup --clobber fsmonitor-test<<-\EOF &&
 		printf "last_update_token\0"
 	EOF
 	git add new &&
@@ -209,7 +241,7 @@ EOF
 
 # test that *only* files returned by the integration script get flagged as invalid
 test_expect_success '*only* files returned by the integration script get flagged as invalid' '
-	write_script .git/hooks/fsmonitor-test<<-\EOF &&
+	test_hook --clobber fsmonitor-test<<-\EOF &&
 	printf "last_update_token\0"
 	printf "dir1/modified\0"
 	EOF
@@ -230,13 +262,13 @@ test_expect_success 'refresh_index() invalidates fsmonitor cache' '
 	dirty_repo &&
 	write_integration_script &&
 	git add . &&
-	write_script .git/hooks/fsmonitor-test<<-\EOF &&
+	test_hook --clobber fsmonitor-test<<-\EOF &&
 	EOF
 	git commit -m "to reset" &&
 	git reset HEAD~1 &&
 	git status >actual &&
 	git -c core.fsmonitor= status >expect &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 # test fsmonitor with and without preloadIndex
@@ -247,7 +279,7 @@ do
 		git config core.preloadIndex $preload_val &&
 		if test $preload_val = true
 		then
-			GIT_TEST_PRELOAD_INDEX=$preload_val; export GIT_TEST_PRELOAD_INDEX
+			GIT_TEST_PRELOAD_INDEX=$preload_val && export GIT_TEST_PRELOAD_INDEX
 		else
 			sane_unset GIT_TEST_PRELOAD_INDEX
 		fi
@@ -273,13 +305,13 @@ do
 			git add dir2/new &&
 			git status >actual &&
 			git -c core.fsmonitor= status >expect &&
-			test_i18ncmp expect actual
+			test_cmp expect actual
 		'
 
 		# Make sure it's actually skipping the check for modified and untracked
 		# (if enabled) files unless it is told about them.
 		test_expect_success "status doesn't detect unreported modifications" '
-			write_script .git/hooks/fsmonitor-test<<-\EOF &&
+			test_hook --clobber fsmonitor-test<<-\EOF &&
 			printf "last_update_token\0"
 			:>marker
 			EOF
@@ -290,14 +322,14 @@ do
 			rm -f marker &&
 			git status >actual &&
 			test_path_is_file marker &&
-			test_i18ngrep ! "Changes not staged for commit:" actual &&
+			test_grep ! "Changes not staged for commit:" actual &&
 			if test $uc_val = true
 			then
-				test_i18ngrep ! "Untracked files:" actual
+				test_grep ! "Untracked files:" actual
 			fi &&
 			if test $uc_val = false
 			then
-				test_i18ngrep "Untracked files:" actual
+				test_grep "Untracked files:" actual
 			fi &&
 			rm -f marker
 		'
@@ -321,20 +353,26 @@ test_expect_success UNTRACKED_CACHE 'ignore .git changes when invalidating UNTR'
 	test_create_repo dot-git &&
 	(
 		cd dot-git &&
-		mkdir -p .git/hooks &&
 		: >tracked &&
+		test-tool chmtime =-60 tracked &&
 		: >modified &&
+		test-tool chmtime =-60 modified &&
 		mkdir dir1 &&
 		: >dir1/tracked &&
+		test-tool chmtime =-60 dir1/tracked &&
 		: >dir1/modified &&
+		test-tool chmtime =-60 dir1/modified &&
 		mkdir dir2 &&
 		: >dir2/tracked &&
+		test-tool chmtime =-60 dir2/tracked &&
 		: >dir2/modified &&
+		test-tool chmtime =-60 dir2/modified &&
 		write_integration_script &&
 		git config core.fsmonitor .git/hooks/fsmonitor-test &&
 		git update-index --untracked-cache &&
 		git update-index --fsmonitor &&
-		GIT_TRACE_UNTRACKED_STATS="$TRASH_DIRECTORY/trace-before" \
+		git status &&
+		GIT_TRACE2_PERF="$TRASH_DIRECTORY/trace-before" \
 		git status &&
 		test-tool dump-untracked-cache >../before
 	) &&
@@ -346,12 +384,12 @@ test_expect_success UNTRACKED_CACHE 'ignore .git changes when invalidating UNTR'
 	EOF
 	(
 		cd dot-git &&
-		GIT_TRACE_UNTRACKED_STATS="$TRASH_DIRECTORY/trace-after" \
+		GIT_TRACE2_PERF="$TRASH_DIRECTORY/trace-after" \
 		git status &&
 		test-tool dump-untracked-cache >../after
 	) &&
-	grep "directory invalidation" trace-before >>before &&
-	grep "directory invalidation" trace-after >>after &&
+	grep "directory-invalidation" trace-before | cut -d"|" -f 9 >>before &&
+	grep "directory-invalidation" trace-after  | cut -d"|" -f 9 >>after &&
 	# UNTR extension unchanged, dir invalidation count unchanged
 	test_cmp before after
 '
@@ -383,4 +421,60 @@ test_expect_success 'status succeeds after staging/unstaging' '
 	)
 '
 
+# Usage:
+# check_sparse_index_behavior [!]
+# If "!" is supplied, then we verify that we do not call ensure_full_index
+# during a call to 'git status'. Otherwise, we verify that we _do_ call it.
+check_sparse_index_behavior () {
+	git -C full status --porcelain=v2 >expect &&
+	GIT_TRACE2_EVENT="$(pwd)/trace2.txt" \
+		git -C sparse status --porcelain=v2 >actual &&
+	test_region $1 index ensure_full_index trace2.txt &&
+	test_region fsm_hook query trace2.txt &&
+	test_cmp expect actual &&
+	rm trace2.txt
+}
+
+test_expect_success 'status succeeds with sparse index' '
+	(
+		sane_unset GIT_TEST_SPLIT_INDEX &&
+
+		git clone . full &&
+		git clone --sparse . sparse &&
+		git -C sparse sparse-checkout init --cone --sparse-index &&
+		git -C sparse sparse-checkout set dir1 dir2 &&
+
+		test_hook --clobber fsmonitor-test <<-\EOF &&
+			printf "last_update_token\0"
+		EOF
+		git -C full config core.fsmonitor ../.git/hooks/fsmonitor-test &&
+		git -C sparse config core.fsmonitor ../.git/hooks/fsmonitor-test &&
+		check_sparse_index_behavior ! &&
+
+		test_hook --clobber fsmonitor-test <<-\EOF &&
+			printf "last_update_token\0"
+			printf "dir1/modified\0"
+		EOF
+		check_sparse_index_behavior ! &&
+
+		git -C sparse sparse-checkout add dir1a &&
+
+		for repo in full sparse
+		do
+			cp -r $repo/dir1 $repo/dir1a &&
+			git -C $repo add dir1a &&
+			git -C $repo commit -m "add dir1a" || return 1
+		done &&
+		git -C sparse sparse-checkout set dir1 dir2 &&
+
+		# This one modifies outside the sparse-checkout definition
+		# and hence we expect to expand the sparse-index.
+		test_hook --clobber fsmonitor-test <<-\EOF &&
+			printf "last_update_token\0"
+			printf "dir1a/modified\0"
+		EOF
+		check_sparse_index_behavior
+	)
+'
+
 test_done
diff --git a/t/t7520-ignored-hook-warning.sh b/t/t7520-ignored-hook-warning.sh
index 634fb7f..3b63c34 100755
--- a/t/t7520-ignored-hook-warning.sh
+++ b/t/t7520-ignored-hook-warning.sh
@@ -2,40 +2,38 @@
 
 test_description='ignored hook warning'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
-	hookdir="$(git rev-parse --git-dir)/hooks" &&
-	hook="$hookdir/pre-commit" &&
-	mkdir -p "$hookdir" &&
-	write_script "$hook" <<-\EOF
+	test_hook --setup pre-commit <<-\EOF
 	exit 0
 	EOF
 '
 
 test_expect_success 'no warning if hook is not ignored' '
 	git commit --allow-empty -m "more" 2>message &&
-	test_i18ngrep ! -e "hook was ignored" message
+	test_grep ! -e "hook was ignored" message
 '
 
 test_expect_success POSIXPERM 'warning if hook is ignored' '
-	chmod -x "$hook" &&
+	test_hook --disable pre-commit &&
 	git commit --allow-empty -m "even more" 2>message &&
-	test_i18ngrep -e "hook was ignored" message
+	test_grep -e "hook was ignored" message
 '
 
 test_expect_success POSIXPERM 'no warning if advice.ignoredHook set to false' '
 	test_config advice.ignoredHook false &&
-	chmod -x "$hook" &&
+	test_hook --disable pre-commit &&
 	git commit --allow-empty -m "even more" 2>message &&
-	test_i18ngrep ! -e "hook was ignored" message
+	test_grep ! -e "hook was ignored" message
 '
 
 test_expect_success 'no warning if unset advice.ignoredHook and hook removed' '
-	rm -f "$hook" &&
+	test_hook --remove pre-commit &&
 	test_unconfig advice.ignoredHook &&
 	git commit --allow-empty -m "even more" 2>message &&
-	test_i18ngrep ! -e "hook was ignored" message
+	test_grep ! -e "hook was ignored" message
 '
 
 test_done
diff --git a/t/t7521-ignored-mode.sh b/t/t7521-ignored-mode.sh
index 9179094..a88b02b 100755
--- a/t/t7521-ignored-mode.sh
+++ b/t/t7521-ignored-mode.sh
@@ -30,7 +30,7 @@ test_expect_success 'Verify behavior of status on directories with ignored files
 		dir/ignored/ignored_1.ign dir/ignored/ignored_2.ign &&
 
 	git status --porcelain=v2 --ignored=matching --untracked-files=all >output &&
-	test_i18ncmp expect output
+	test_cmp expect output
 '
 
 test_expect_success 'Verify status behavior on directory with tracked & ignored files' '
@@ -55,7 +55,7 @@ test_expect_success 'Verify status behavior on directory with tracked & ignored
 	git commit -m "commit tracked files" &&
 
 	git status --porcelain=v2 --ignored=matching --untracked-files=all >output &&
-	test_i18ncmp expect output
+	test_cmp expect output
 '
 
 test_expect_success 'Verify status behavior on directory with untracked and ignored files' '
@@ -80,7 +80,7 @@ test_expect_success 'Verify status behavior on directory with untracked and igno
 		dir/untracked_ignored/ignored_1.ign dir/untracked_ignored/ignored_2.ign &&
 
 	git status --porcelain=v2 --ignored=matching --untracked-files=all >output &&
-	test_i18ncmp expect output
+	test_cmp expect output
 '
 
 test_expect_success 'Verify status matching ignored files on ignored directory' '
@@ -96,7 +96,7 @@ test_expect_success 'Verify status matching ignored files on ignored directory'
 		ignored_dir/ignored_1.ign ignored_dir/ignored_2.ign &&
 
 	git status --porcelain=v2 --ignored=matching --untracked-files=all >output &&
-	test_i18ncmp expect output
+	test_cmp expect output
 '
 
 test_expect_success 'Verify status behavior on ignored directory containing tracked file' '
@@ -117,7 +117,7 @@ test_expect_success 'Verify status behavior on ignored directory containing trac
 	git add -f ignored_dir/tracked &&
 	git commit -m "Force add file in ignored directory" &&
 	git status --porcelain=v2 --ignored=matching --untracked-files=all >output &&
-	test_i18ncmp expect output
+	test_cmp expect output
 '
 
 test_expect_success 'Verify matching ignored files with --untracked-files=normal' '
@@ -136,7 +136,7 @@ test_expect_success 'Verify matching ignored files with --untracked-files=normal
 		ignored_files/ignored_1.ign ignored_files/ignored_2.ign \
 		untracked_dir/untracked &&
 	git status --porcelain=v2 --ignored=matching --untracked-files=normal >output &&
-	test_i18ncmp expect output
+	test_cmp expect output
 '
 
 test_expect_success 'Verify matching ignored files with --untracked-files=normal' '
@@ -155,7 +155,7 @@ test_expect_success 'Verify matching ignored files with --untracked-files=normal
 		ignored_files/ignored_1.ign ignored_files/ignored_2.ign \
 		untracked_dir/untracked &&
 	git status --porcelain=v2 --ignored=matching --untracked-files=normal >output &&
-	test_i18ncmp expect output
+	test_cmp expect output
 '
 
 test_expect_success 'Verify status behavior on ignored directory containing tracked file' '
@@ -176,7 +176,7 @@ test_expect_success 'Verify status behavior on ignored directory containing trac
 	git add -f ignored_dir/tracked &&
 	git commit -m "Force add file in ignored directory" &&
 	git status --porcelain=v2 --ignored=matching --untracked-files=normal >output &&
-	test_i18ncmp expect output
+	test_cmp expect output
 '
 
 test_expect_success 'Verify behavior of status with --ignored=no' '
@@ -191,7 +191,7 @@ test_expect_success 'Verify behavior of status with --ignored=no' '
 		dir/ignored/ignored_1.ign dir/ignored/ignored_2.ign &&
 
 	git status --porcelain=v2 --ignored=no --untracked-files=all >output &&
-	test_i18ncmp expect output
+	test_cmp expect output
 '
 
 test_expect_success 'Verify behavior of status with --ignored=traditional and --untracked-files=all' '
@@ -210,7 +210,7 @@ test_expect_success 'Verify behavior of status with --ignored=traditional and --
 		dir/ignored/ignored_1.ign dir/ignored/ignored_2.ign &&
 
 	git status --porcelain=v2 --ignored=traditional --untracked-files=all >output &&
-	test_i18ncmp expect output
+	test_cmp expect output
 '
 
 test_expect_success 'Verify behavior of status with --ignored=traditional and --untracked-files=normal' '
@@ -227,7 +227,7 @@ test_expect_success 'Verify behavior of status with --ignored=traditional and --
 		dir/ignored/ignored_1.ign dir/ignored/ignored_2.ign &&
 
 	git status --porcelain=v2 --ignored=traditional --untracked-files=normal >output &&
-	test_i18ncmp expect output
+	test_cmp expect output
 '
 
 test_done
diff --git a/t/t7524-commit-summary.sh b/t/t7524-commit-summary.sh
new file mode 100755
index 0000000..47b2f1d
--- /dev/null
+++ b/t/t7524-commit-summary.sh
@@ -0,0 +1,31 @@
+#!/bin/sh
+
+test_description='git commit summary'
+. ./test-lib.sh
+
+test_expect_success 'setup' '
+	test_seq 101 200 >file &&
+	git add file &&
+	git commit -m initial &&
+	git tag initial
+'
+
+test_expect_success 'commit summary ignores rewrites' '
+	git reset --hard initial &&
+	test_seq 200 300 >file &&
+
+	git diff --stat >diffstat &&
+	git diff --stat --break-rewrites >diffstatrewrite &&
+
+	# make sure this scenario is a detectable rewrite
+	! test_cmp_bin diffstat diffstatrewrite &&
+
+	git add file &&
+	git commit -m second >actual &&
+
+	grep "1 file" <actual >actual.total &&
+	grep "1 file" <diffstat >diffstat.total &&
+	test_cmp diffstat.total actual.total
+'
+
+test_done
diff --git a/t/t7525-status-rename.sh b/t/t7525-status-rename.sh
index a62736d..a9210d3 100755
--- a/t/t7525-status-rename.sh
+++ b/t/t7525-status-rename.sh
@@ -2,6 +2,7 @@
 
 test_description='git status rename detection options'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -20,81 +21,81 @@ test_expect_success 'setup' '
 
 test_expect_success 'status no-options' '
 	git status >actual &&
-	test_i18ngrep "renamed:" actual
+	test_grep "renamed:" actual
 '
 
 test_expect_success 'status --no-renames' '
 	git status --no-renames >actual &&
-	test_i18ngrep "deleted:" actual &&
-	test_i18ngrep "new file:" actual
+	test_grep "deleted:" actual &&
+	test_grep "new file:" actual
 '
 
 test_expect_success 'status.renames inherits from diff.renames false' '
 	git -c diff.renames=false status >actual &&
-	test_i18ngrep "deleted:" actual &&
-	test_i18ngrep "new file:" actual
+	test_grep "deleted:" actual &&
+	test_grep "new file:" actual
 '
 
 test_expect_success 'status.renames inherits from diff.renames true' '
 	git -c diff.renames=true status >actual &&
-	test_i18ngrep "renamed:" actual
+	test_grep "renamed:" actual
 '
 
 test_expect_success 'status.renames overrides diff.renames false' '
 	git -c diff.renames=true -c status.renames=false status >actual &&
-	test_i18ngrep "deleted:" actual &&
-	test_i18ngrep "new file:" actual
+	test_grep "deleted:" actual &&
+	test_grep "new file:" actual
 '
 
 test_expect_success 'status.renames overrides from diff.renames true' '
 	git -c diff.renames=false -c status.renames=true status >actual &&
-	test_i18ngrep "renamed:" actual
+	test_grep "renamed:" actual
 '
 
 test_expect_success 'status status.renames=false' '
 	git -c status.renames=false status >actual &&
-	test_i18ngrep "deleted:" actual &&
-	test_i18ngrep "new file:" actual
+	test_grep "deleted:" actual &&
+	test_grep "new file:" actual
 '
 
 test_expect_success 'status status.renames=true' '
 	git -c status.renames=true status >actual &&
-	test_i18ngrep "renamed:" actual
+	test_grep "renamed:" actual
 '
 
 test_expect_success 'commit honors status.renames=false' '
 	git -c status.renames=false commit --dry-run >actual &&
-	test_i18ngrep "deleted:" actual &&
-	test_i18ngrep "new file:" actual
+	test_grep "deleted:" actual &&
+	test_grep "new file:" actual
 '
 
 test_expect_success 'commit honors status.renames=true' '
 	git -c status.renames=true commit --dry-run >actual &&
-	test_i18ngrep "renamed:" actual
+	test_grep "renamed:" actual
 '
 
 test_expect_success 'status config overridden' '
 	git -c status.renames=true status --no-renames >actual &&
-	test_i18ngrep "deleted:" actual &&
-	test_i18ngrep "new file:" actual
+	test_grep "deleted:" actual &&
+	test_grep "new file:" actual
 '
 
 test_expect_success 'status score=100%' '
 	git status -M=100% >actual &&
-	test_i18ngrep "deleted:" actual &&
-	test_i18ngrep "new file:" actual &&
+	test_grep "deleted:" actual &&
+	test_grep "new file:" actual &&
 
 	git status --find-renames=100% >actual &&
-	test_i18ngrep "deleted:" actual &&
-	test_i18ngrep "new file:" actual
+	test_grep "deleted:" actual &&
+	test_grep "new file:" actual
 '
 
 test_expect_success 'status score=01%' '
 	git status -M=01% >actual &&
-	test_i18ngrep "renamed:" actual &&
+	test_grep "renamed:" actual &&
 
 	git status --find-renames=01% >actual &&
-	test_i18ngrep "renamed:" actual
+	test_grep "renamed:" actual
 '
 
 test_expect_success 'copies not overridden by find-renames' '
@@ -102,12 +103,12 @@ test_expect_success 'copies not overridden by find-renames' '
 	git add copy &&
 
 	git -c status.renames=copies status -M=01% >actual &&
-	test_i18ngrep "copied:" actual &&
-	test_i18ngrep "renamed:" actual &&
+	test_grep "copied:" actual &&
+	test_grep "renamed:" actual &&
 
 	git -c status.renames=copies status --find-renames=01% >actual &&
-	test_i18ngrep "copied:" actual &&
-	test_i18ngrep "renamed:" actual
+	test_grep "copied:" actual &&
+	test_grep "renamed:" actual
 '
 
 test_done
diff --git a/t/t7526-commit-pathspec-file.sh b/t/t7526-commit-pathspec-file.sh
index 5fbe47e..c97c550 100755
--- a/t/t7526-commit-pathspec-file.sh
+++ b/t/t7526-commit-pathspec-file.sh
@@ -2,6 +2,7 @@
 
 test_description='commit --pathspec-from-file'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_tick
@@ -140,25 +141,25 @@ test_expect_success 'error conditions' '
 	>empty_list &&
 
 	test_must_fail git commit --pathspec-from-file=list --interactive -m "Commit" 2>err &&
-	test_i18ngrep -e "--pathspec-from-file is incompatible with --interactive/--patch" err &&
+	test_grep -e "options .--pathspec-from-file. and .--interactive/--patch. cannot be used together" err &&
 
 	test_must_fail git commit --pathspec-from-file=list --patch -m "Commit" 2>err &&
-	test_i18ngrep -e "--pathspec-from-file is incompatible with --interactive/--patch" err &&
+	test_grep -e "options .--pathspec-from-file. and .--interactive/--patch. cannot be used together" err &&
 
 	test_must_fail git commit --pathspec-from-file=list --all -m "Commit" 2>err &&
-	test_i18ngrep -e "--pathspec-from-file with -a does not make sense" err &&
+	test_grep -e "options .--pathspec-from-file. and .-a. cannot be used together" err &&
 
 	test_must_fail git commit --pathspec-from-file=list -m "Commit" -- fileA.t 2>err &&
-	test_i18ngrep -e "--pathspec-from-file is incompatible with pathspec arguments" err &&
+	test_grep -e ".--pathspec-from-file. and pathspec arguments cannot be used together" err &&
 
 	test_must_fail git commit --pathspec-file-nul -m "Commit" 2>err &&
-	test_i18ngrep -e "--pathspec-file-nul requires --pathspec-from-file" err &&
+	test_grep -e "the option .--pathspec-file-nul. requires .--pathspec-from-file." err &&
 
 	test_must_fail git commit --pathspec-from-file=empty_list --include -m "Commit" 2>err &&
-	test_i18ngrep -e "No paths with --include/--only does not make sense." err &&
+	test_grep -e "No paths with --include/--only does not make sense." err &&
 
 	test_must_fail git commit --pathspec-from-file=empty_list --only -m "Commit" 2>err &&
-	test_i18ngrep -e "No paths with --include/--only does not make sense." err
+	test_grep -e "No paths with --include/--only does not make sense." err
 '
 
 test_done
diff --git a/t/t7527-builtin-fsmonitor.sh b/t/t7527-builtin-fsmonitor.sh
new file mode 100755
index 0000000..730f3c7
--- /dev/null
+++ b/t/t7527-builtin-fsmonitor.sh
@@ -0,0 +1,1263 @@
+#!/bin/sh
+
+test_description='built-in file system watcher'
+
+. ./test-lib.sh
+
+if ! test_have_prereq FSMONITOR_DAEMON
+then
+	skip_all="fsmonitor--daemon is not supported on this platform"
+	test_done
+fi
+
+stop_daemon_delete_repo () {
+	r=$1 &&
+	test_might_fail git -C $r fsmonitor--daemon stop &&
+	rm -rf $1
+}
+
+start_daemon () {
+	r= tf= t2= tk= &&
+
+	while test "$#" -ne 0
+	do
+		case "$1" in
+		-C)
+			r="-C ${2?}"
+			shift
+			;;
+		--tf)
+			tf="${2?}"
+			shift
+			;;
+		--t2)
+			t2="${2?}"
+			shift
+			;;
+		--tk)
+			tk="${2?}"
+			shift
+			;;
+		-*)
+			BUG "error: unknown option: '$1'"
+			;;
+		*)
+			BUG "error: unbound argument: '$1'"
+			;;
+		esac
+		shift
+	done &&
+
+	(
+		if test -n "$tf"
+		then
+			GIT_TRACE_FSMONITOR="$tf"
+			export GIT_TRACE_FSMONITOR
+		fi &&
+
+		if test -n "$t2"
+		then
+			GIT_TRACE2_PERF="$t2"
+			export GIT_TRACE2_PERF
+		fi &&
+
+		if test -n "$tk"
+		then
+			GIT_TEST_FSMONITOR_TOKEN="$tk"
+			export GIT_TEST_FSMONITOR_TOKEN
+		fi &&
+
+		git $r fsmonitor--daemon start &&
+		git $r fsmonitor--daemon status
+	)
+}
+
+# Is a Trace2 data event present with the given catetory and key?
+# We do not care what the value is.
+#
+have_t2_data_event () {
+	c=$1 &&
+	k=$2 &&
+
+	grep -e '"event":"data".*"category":"'"$c"'".*"key":"'"$k"'"'
+}
+
+test_expect_success 'explicit daemon start and stop' '
+	test_when_finished "stop_daemon_delete_repo test_explicit" &&
+
+	git init test_explicit &&
+	start_daemon -C test_explicit &&
+
+	git -C test_explicit fsmonitor--daemon stop &&
+	test_must_fail git -C test_explicit fsmonitor--daemon status
+'
+
+test_expect_success 'implicit daemon start' '
+	test_when_finished "stop_daemon_delete_repo test_implicit" &&
+
+	git init test_implicit &&
+	test_must_fail git -C test_implicit fsmonitor--daemon status &&
+
+	# query will implicitly start the daemon.
+	#
+	# for test-script simplicity, we send a V1 timestamp rather than
+	# a V2 token.  either way, the daemon response to any query contains
+	# a new V2 token.  (the daemon may complain that we sent a V1 request,
+	# but this test case is only concerned with whether the daemon was
+	# implicitly started.)
+
+	GIT_TRACE2_EVENT="$PWD/.git/trace" \
+		test-tool -C test_implicit fsmonitor-client query --token 0 >actual &&
+	nul_to_q <actual >actual.filtered &&
+	grep "builtin:" actual.filtered &&
+
+	# confirm that a daemon was started in the background.
+	#
+	# since the mechanism for starting the background daemon is platform
+	# dependent, just confirm that the foreground command received a
+	# response from the daemon.
+
+	have_t2_data_event fsm_client query/response-length <.git/trace &&
+
+	git -C test_implicit fsmonitor--daemon status &&
+	git -C test_implicit fsmonitor--daemon stop &&
+	test_must_fail git -C test_implicit fsmonitor--daemon status
+'
+
+# Verify that the daemon has shutdown.  Spin a few seconds to
+# make the test a little more robust during CI testing.
+#
+# We're looking for an implicit shutdown, such as when we delete or
+# rename the ".git" directory.  Our delete/rename will cause a file
+# system event that the daemon will see and the daemon will
+# auto-shutdown as soon as it sees it.  But this is racy with our `git
+# fsmonitor--daemon status` commands (and we cannot use a cookie file
+# here to help us).  So spin a little and give the daemon a chance to
+# see the event.  (This is primarily for underpowered CI build/test
+# machines (where it might take a moment to wake and reschedule the
+# daemon process) to avoid false alarms during test runs.)
+#
+IMPLICIT_TIMEOUT=5
+
+verify_implicit_shutdown () {
+	r=$1 &&
+
+	k=0 &&
+	while test "$k" -lt $IMPLICIT_TIMEOUT
+	do
+		git -C $r fsmonitor--daemon status || return 0
+
+		sleep 1
+		k=$(( $k + 1 ))
+	done &&
+
+	return 1
+}
+
+test_expect_success 'implicit daemon stop (delete .git)' '
+	test_when_finished "stop_daemon_delete_repo test_implicit_1" &&
+
+	git init test_implicit_1 &&
+
+	start_daemon -C test_implicit_1 &&
+
+	# deleting the .git directory will implicitly stop the daemon.
+	rm -rf test_implicit_1/.git &&
+
+	# [1] Create an empty .git directory so that the following Git
+	#     command will stay relative to the `-C` directory.
+	#
+	#     Without this, the Git command will override the requested
+	#     -C argument and crawl out to the containing Git source tree.
+	#     This would make the test result dependent upon whether we
+	#     were using fsmonitor on our development worktree.
+	#
+	mkdir test_implicit_1/.git &&
+
+	verify_implicit_shutdown test_implicit_1
+'
+
+test_expect_success 'implicit daemon stop (rename .git)' '
+	test_when_finished "stop_daemon_delete_repo test_implicit_2" &&
+
+	git init test_implicit_2 &&
+
+	start_daemon -C test_implicit_2 &&
+
+	# renaming the .git directory will implicitly stop the daemon.
+	mv test_implicit_2/.git test_implicit_2/.xxx &&
+
+	# See [1] above.
+	#
+	mkdir test_implicit_2/.git &&
+
+	verify_implicit_shutdown test_implicit_2
+'
+
+# File systems on Windows may or may not have shortnames.
+# This is a volume-specific setting on modern systems.
+# "C:/" drives are required to have them enabled.  Other
+# hard drives default to disabled.
+#
+# This is a crude test to see if shortnames are enabled
+# on the volume containing the test directory.  It is
+# crude, but it does not require elevation like `fsutil`.
+#
+test_lazy_prereq SHORTNAMES '
+	mkdir .foo &&
+	test -d "FOO~1"
+'
+
+# Here we assume that the shortname of ".git" is "GIT~1".
+test_expect_success MINGW,SHORTNAMES 'implicit daemon stop (rename GIT~1)' '
+	test_when_finished "stop_daemon_delete_repo test_implicit_1s" &&
+
+	git init test_implicit_1s &&
+
+	start_daemon -C test_implicit_1s &&
+
+	# renaming the .git directory will implicitly stop the daemon.
+	# this moves {.git, GIT~1} to {.gitxyz, GITXYZ~1}.
+	# the rename-from FS Event will contain the shortname.
+	#
+	mv test_implicit_1s/GIT~1 test_implicit_1s/.gitxyz &&
+
+	# See [1] above.
+	# this moves {.gitxyz, GITXYZ~1} to {.git, GIT~1}.
+	mv test_implicit_1s/.gitxyz test_implicit_1s/.git &&
+
+	verify_implicit_shutdown test_implicit_1s
+'
+
+# Here we first create a file with LONGNAME of "GIT~1" before
+# we create the repo.  This will cause the shortname of ".git"
+# to be "GIT~2".
+test_expect_success MINGW,SHORTNAMES 'implicit daemon stop (rename GIT~2)' '
+	test_when_finished "stop_daemon_delete_repo test_implicit_1s2" &&
+
+	mkdir test_implicit_1s2 &&
+	echo HELLO >test_implicit_1s2/GIT~1 &&
+	git init test_implicit_1s2 &&
+
+	test_path_is_file test_implicit_1s2/GIT~1 &&
+	test_path_is_dir  test_implicit_1s2/GIT~2 &&
+
+	start_daemon -C test_implicit_1s2 &&
+
+	# renaming the .git directory will implicitly stop the daemon.
+	# the rename-from FS Event will contain the shortname.
+	#
+	mv test_implicit_1s2/GIT~2 test_implicit_1s2/.gitxyz &&
+
+	# See [1] above.
+	mv test_implicit_1s2/.gitxyz test_implicit_1s2/.git &&
+
+	verify_implicit_shutdown test_implicit_1s2
+'
+
+test_expect_success 'cannot start multiple daemons' '
+	test_when_finished "stop_daemon_delete_repo test_multiple" &&
+
+	git init test_multiple &&
+
+	start_daemon -C test_multiple &&
+
+	test_must_fail git -C test_multiple fsmonitor--daemon start 2>actual &&
+	grep "fsmonitor--daemon is already running" actual &&
+
+	git -C test_multiple fsmonitor--daemon stop &&
+	test_must_fail git -C test_multiple fsmonitor--daemon status
+'
+
+# These tests use the main repo in the trash directory
+
+test_expect_success 'setup' '
+	>tracked &&
+	>modified &&
+	>delete &&
+	>rename &&
+	mkdir dir1 &&
+	>dir1/tracked &&
+	>dir1/modified &&
+	>dir1/delete &&
+	>dir1/rename &&
+	mkdir dir2 &&
+	>dir2/tracked &&
+	>dir2/modified &&
+	>dir2/delete &&
+	>dir2/rename &&
+	mkdir dirtorename &&
+	>dirtorename/a &&
+	>dirtorename/b &&
+
+	cat >.gitignore <<-\EOF &&
+	.gitignore
+	expect*
+	actual*
+	flush*
+	trace*
+	EOF
+
+	mkdir -p T1/T2/T3/T4 &&
+	echo 1 >T1/F1 &&
+	echo 1 >T1/T2/F1 &&
+	echo 1 >T1/T2/T3/F1 &&
+	echo 1 >T1/T2/T3/T4/F1 &&
+	echo 2 >T1/F2 &&
+	echo 2 >T1/T2/F2 &&
+	echo 2 >T1/T2/T3/F2 &&
+	echo 2 >T1/T2/T3/T4/F2 &&
+
+	git -c core.fsmonitor=false add . &&
+	test_tick &&
+	git -c core.fsmonitor=false commit -m initial &&
+
+	git config core.fsmonitor true
+'
+
+# The test already explicitly stopped (or tried to stop) the daemon.
+# This is here in case something else fails first.
+#
+redundant_stop_daemon () {
+	test_might_fail git fsmonitor--daemon stop
+}
+
+test_expect_success 'update-index implicitly starts daemon' '
+	test_when_finished redundant_stop_daemon &&
+
+	test_must_fail git fsmonitor--daemon status &&
+
+	GIT_TRACE2_EVENT="$PWD/.git/trace_implicit_1" \
+		git update-index --fsmonitor &&
+
+	git fsmonitor--daemon status &&
+	test_might_fail git fsmonitor--daemon stop &&
+
+	# Confirm that the trace2 log contains a record of the
+	# daemon starting.
+	test_subcommand git fsmonitor--daemon start <.git/trace_implicit_1
+'
+
+test_expect_success 'status implicitly starts daemon' '
+	test_when_finished redundant_stop_daemon &&
+
+	test_must_fail git fsmonitor--daemon status &&
+
+	GIT_TRACE2_EVENT="$PWD/.git/trace_implicit_2" \
+		git status >actual &&
+
+	git fsmonitor--daemon status &&
+	test_might_fail git fsmonitor--daemon stop &&
+
+	# Confirm that the trace2 log contains a record of the
+	# daemon starting.
+	test_subcommand git fsmonitor--daemon start <.git/trace_implicit_2
+'
+
+edit_files () {
+	echo 1 >modified &&
+	echo 2 >dir1/modified &&
+	echo 3 >dir2/modified &&
+	>dir1/untracked
+}
+
+delete_files () {
+	rm -f delete &&
+	rm -f dir1/delete &&
+	rm -f dir2/delete
+}
+
+create_files () {
+	echo 1 >new &&
+	echo 2 >dir1/new &&
+	echo 3 >dir2/new
+}
+
+rename_files () {
+	mv rename renamed &&
+	mv dir1/rename dir1/renamed &&
+	mv dir2/rename dir2/renamed
+}
+
+file_to_directory () {
+	rm -f delete &&
+	mkdir delete &&
+	echo 1 >delete/new
+}
+
+directory_to_file () {
+	rm -rf dir1 &&
+	echo 1 >dir1
+}
+
+move_directory_contents_deeper() {
+	mkdir T1/_new_ &&
+	mv T1/[A-Z]* T1/_new_
+}
+
+move_directory_up() {
+	mv T1/T2/T3 T1
+}
+
+move_directory() {
+	mv T1/T2/T3 T1/T2/NewT3
+}
+
+# The next few test cases confirm that our fsmonitor daemon sees each type
+# of OS filesystem notification that we care about.  At this layer we just
+# ensure we are getting the OS notifications and do not try to confirm what
+# is reported by `git status`.
+#
+# We run a simple query after modifying the filesystem just to introduce
+# a bit of a delay so that the trace logging from the daemon has time to
+# get flushed to disk.
+#
+# We `reset` and `clean` at the bottom of each test (and before stopping the
+# daemon) because these commands might implicitly restart the daemon.
+
+clean_up_repo_and_stop_daemon () {
+	git reset --hard HEAD &&
+	git clean -fd &&
+	test_might_fail git fsmonitor--daemon stop &&
+	rm -f .git/trace
+}
+
+test_expect_success 'edit some files' '
+	test_when_finished clean_up_repo_and_stop_daemon &&
+
+	start_daemon --tf "$PWD/.git/trace" &&
+
+	edit_files &&
+
+	test-tool fsmonitor-client query --token 0 &&
+
+	grep "^event: dir1/modified$"  .git/trace &&
+	grep "^event: dir2/modified$"  .git/trace &&
+	grep "^event: modified$"       .git/trace &&
+	grep "^event: dir1/untracked$" .git/trace
+'
+
+test_expect_success 'create some files' '
+	test_when_finished clean_up_repo_and_stop_daemon &&
+
+	start_daemon --tf "$PWD/.git/trace" &&
+
+	create_files &&
+
+	test-tool fsmonitor-client query --token 0 &&
+
+	grep "^event: dir1/new$" .git/trace &&
+	grep "^event: dir2/new$" .git/trace &&
+	grep "^event: new$"      .git/trace
+'
+
+test_expect_success 'delete some files' '
+	test_when_finished clean_up_repo_and_stop_daemon &&
+
+	start_daemon --tf "$PWD/.git/trace" &&
+
+	delete_files &&
+
+	test-tool fsmonitor-client query --token 0 &&
+
+	grep "^event: dir1/delete$" .git/trace &&
+	grep "^event: dir2/delete$" .git/trace &&
+	grep "^event: delete$"      .git/trace
+'
+
+test_expect_success 'rename some files' '
+	test_when_finished clean_up_repo_and_stop_daemon &&
+
+	start_daemon --tf "$PWD/.git/trace" &&
+
+	rename_files &&
+
+	test-tool fsmonitor-client query --token 0 &&
+
+	grep "^event: dir1/rename$"  .git/trace &&
+	grep "^event: dir2/rename$"  .git/trace &&
+	grep "^event: rename$"       .git/trace &&
+	grep "^event: dir1/renamed$" .git/trace &&
+	grep "^event: dir2/renamed$" .git/trace &&
+	grep "^event: renamed$"      .git/trace
+'
+
+test_expect_success 'rename directory' '
+	test_when_finished clean_up_repo_and_stop_daemon &&
+
+	start_daemon --tf "$PWD/.git/trace" &&
+
+	mv dirtorename dirrenamed &&
+
+	test-tool fsmonitor-client query --token 0 &&
+
+	grep "^event: dirtorename/*$" .git/trace &&
+	grep "^event: dirrenamed/*$"  .git/trace
+'
+
+test_expect_success 'file changes to directory' '
+	test_when_finished clean_up_repo_and_stop_daemon &&
+
+	start_daemon --tf "$PWD/.git/trace" &&
+
+	file_to_directory &&
+
+	test-tool fsmonitor-client query --token 0 &&
+
+	grep "^event: delete$"     .git/trace &&
+	grep "^event: delete/new$" .git/trace
+'
+
+test_expect_success 'directory changes to a file' '
+	test_when_finished clean_up_repo_and_stop_daemon &&
+
+	start_daemon --tf "$PWD/.git/trace" &&
+
+	directory_to_file &&
+
+	test-tool fsmonitor-client query --token 0 &&
+
+	grep "^event: dir1$" .git/trace
+'
+
+# The next few test cases exercise the token-resync code.  When filesystem
+# drops events (because of filesystem velocity or because the daemon isn't
+# polling fast enough), we need to discard the cached data (relative to the
+# current token) and start collecting events under a new token.
+#
+# the 'test-tool fsmonitor-client flush' command can be used to send a
+# "flush" message to a running daemon and ask it to do a flush/resync.
+
+test_expect_success 'flush cached data' '
+	test_when_finished "stop_daemon_delete_repo test_flush" &&
+
+	git init test_flush &&
+
+	start_daemon -C test_flush --tf "$PWD/.git/trace_daemon" --tk true &&
+
+	# The daemon should have an initial token with no events in _0 and
+	# then a few (probably platform-specific number of) events in _1.
+	# These should both have the same <token_id>.
+
+	test-tool -C test_flush fsmonitor-client query --token "builtin:test_00000001:0" >actual_0 &&
+	nul_to_q <actual_0 >actual_q0 &&
+
+	>test_flush/file_1 &&
+	>test_flush/file_2 &&
+
+	test-tool -C test_flush fsmonitor-client query --token "builtin:test_00000001:0" >actual_1 &&
+	nul_to_q <actual_1 >actual_q1 &&
+
+	grep "file_1" actual_q1 &&
+
+	# Force a flush.  This will change the <token_id>, reset the <seq_nr>, and
+	# flush the file data.  Then create some events and ensure that the file
+	# again appears in the cache.  It should have the new <token_id>.
+
+	test-tool -C test_flush fsmonitor-client flush >flush_0 &&
+	nul_to_q <flush_0 >flush_q0 &&
+	grep "^builtin:test_00000002:0Q/Q$" flush_q0 &&
+
+	test-tool -C test_flush fsmonitor-client query --token "builtin:test_00000002:0" >actual_2 &&
+	nul_to_q <actual_2 >actual_q2 &&
+
+	grep "^builtin:test_00000002:0Q$" actual_q2 &&
+
+	>test_flush/file_3 &&
+
+	test-tool -C test_flush fsmonitor-client query --token "builtin:test_00000002:0" >actual_3 &&
+	nul_to_q <actual_3 >actual_q3 &&
+
+	grep "file_3" actual_q3
+'
+
+# The next few test cases create repos where the .git directory is NOT
+# inside the one of the working directory.  That is, where .git is a file
+# that points to a directory elsewhere.  This happens for submodules and
+# non-primary worktrees.
+
+test_expect_success 'setup worktree base' '
+	git init wt-base &&
+	echo 1 >wt-base/file1 &&
+	git -C wt-base add file1 &&
+	git -C wt-base commit -m "c1"
+'
+
+test_expect_success 'worktree with .git file' '
+	git -C wt-base worktree add ../wt-secondary &&
+
+	start_daemon -C wt-secondary \
+		--tf "$PWD/trace_wt_secondary" \
+		--t2 "$PWD/trace2_wt_secondary" &&
+
+	git -C wt-secondary fsmonitor--daemon stop &&
+	test_must_fail git -C wt-secondary fsmonitor--daemon status
+'
+
+# NEEDSWORK: Repeat one of the "edit" tests on wt-secondary and
+# confirm that we get the same events and behavior -- that is, that
+# fsmonitor--daemon correctly watches BOTH the working directory and
+# the external GITDIR directory and behaves the same as when ".git"
+# is a directory inside the working directory.
+
+test_expect_success 'cleanup worktrees' '
+	stop_daemon_delete_repo wt-secondary &&
+	stop_daemon_delete_repo wt-base
+'
+
+# The next few tests perform arbitrary/contrived file operations and
+# confirm that status is correct.  That is, that the data (or lack of
+# data) from fsmonitor doesn't cause incorrect results.  And doesn't
+# cause incorrect results when the untracked-cache is enabled.
+
+test_lazy_prereq UNTRACKED_CACHE '
+	git update-index --test-untracked-cache
+'
+
+test_expect_success 'Matrix: setup for untracked-cache,fsmonitor matrix' '
+	test_unconfig core.fsmonitor &&
+	git update-index --no-fsmonitor &&
+	test_might_fail git fsmonitor--daemon stop
+'
+
+matrix_clean_up_repo () {
+	git reset --hard HEAD &&
+	git clean -fd
+}
+
+matrix_try () {
+	uc=$1 &&
+	fsm=$2 &&
+	fn=$3 &&
+
+	if test $uc = true && test $fsm = false
+	then
+		# The untracked-cache is buggy when FSMonitor is
+		# DISABLED, so skip the tests for this matrix
+		# combination.
+		#
+		# We've observed random, occasional test failures on
+		# Windows and MacOS when the UC is turned on and FSM
+		# is turned off.  These are rare, but they do happen
+		# indicating that it is probably a race condition within
+		# the untracked cache itself.
+		#
+		# It usually happens when a test does F/D trickery and
+		# then the NEXT test fails because of extra status
+		# output from stale UC data from the previous test.
+		#
+		# Since FSMonitor is not involved in the error, skip
+		# the tests for this matrix combination.
+		#
+		return 0
+	fi &&
+
+	test_expect_success "Matrix[uc:$uc][fsm:$fsm] $fn" '
+		matrix_clean_up_repo &&
+		$fn &&
+		if test $uc = false && test $fsm = false
+		then
+			git status --porcelain=v1 >.git/expect.$fn
+		else
+			git status --porcelain=v1 >.git/actual.$fn &&
+			test_cmp .git/expect.$fn .git/actual.$fn
+		fi
+	'
+}
+
+uc_values="false"
+test_have_prereq UNTRACKED_CACHE && uc_values="false true"
+for uc_val in $uc_values
+do
+	if test $uc_val = false
+	then
+		test_expect_success "Matrix[uc:$uc_val] disable untracked cache" '
+			git config core.untrackedcache false &&
+			git update-index --no-untracked-cache
+		'
+	else
+		test_expect_success "Matrix[uc:$uc_val] enable untracked cache" '
+			git config core.untrackedcache true &&
+			git update-index --untracked-cache
+		'
+	fi
+
+	fsm_values="false true"
+	for fsm_val in $fsm_values
+	do
+		if test $fsm_val = false
+		then
+			test_expect_success "Matrix[uc:$uc_val][fsm:$fsm_val] disable fsmonitor" '
+				test_unconfig core.fsmonitor &&
+				git update-index --no-fsmonitor &&
+				test_might_fail git fsmonitor--daemon stop
+			'
+		else
+			test_expect_success "Matrix[uc:$uc_val][fsm:$fsm_val] enable fsmonitor" '
+				git config core.fsmonitor true &&
+				git fsmonitor--daemon start &&
+				git update-index --fsmonitor
+			'
+		fi
+
+		matrix_try $uc_val $fsm_val edit_files
+		matrix_try $uc_val $fsm_val delete_files
+		matrix_try $uc_val $fsm_val create_files
+		matrix_try $uc_val $fsm_val rename_files
+		matrix_try $uc_val $fsm_val file_to_directory
+		matrix_try $uc_val $fsm_val directory_to_file
+
+		matrix_try $uc_val $fsm_val move_directory_contents_deeper
+		matrix_try $uc_val $fsm_val move_directory_up
+		matrix_try $uc_val $fsm_val move_directory
+
+		if test $fsm_val = true
+		then
+			test_expect_success "Matrix[uc:$uc_val][fsm:$fsm_val] disable fsmonitor at end" '
+				test_unconfig core.fsmonitor &&
+				git update-index --no-fsmonitor &&
+				test_might_fail git fsmonitor--daemon stop
+			'
+		fi
+	done
+done
+
+# Test Unicode UTF-8 characters in the pathname of the working
+# directory root.  Use of "*A()" routines rather than "*W()" routines
+# on Windows can sometimes lead to odd failures.
+#
+u1=$(printf "u_c3_a6__\xC3\xA6")
+u2=$(printf "u_e2_99_ab__\xE2\x99\xAB")
+u_values="$u1 $u2"
+for u in $u_values
+do
+	test_expect_success "unicode in repo root path: $u" '
+		test_when_finished "stop_daemon_delete_repo $u" &&
+
+		git init "$u" &&
+		echo 1 >"$u"/file1 &&
+		git -C "$u" add file1 &&
+		git -C "$u" config core.fsmonitor true &&
+
+		start_daemon -C "$u" &&
+		git -C "$u" status >actual &&
+		grep "new file:   file1" actual
+	'
+done
+
+# Test fsmonitor interaction with submodules.
+#
+# If we start the daemon in the super, it will see FS events for
+# everything in the working directory cone and this includes any
+# files/directories contained *within* the submodules.
+#
+# A `git status` at top level will get events for items within the
+# submodule and ignore them, since they aren't named in the index
+# of the super repo.  This makes the fsmonitor response a little
+# noisy, but it doesn't alter the correctness of the state of the
+# super-proper.
+#
+# When we have submodules, `git status` normally does a recursive
+# status on each of the submodules and adds a summary row for any
+# dirty submodules.  (See the "S..." bits in porcelain V2 output.)
+#
+# It is therefore important that the top level status not be tricked
+# by the FSMonitor response to skip those recursive calls.  That is,
+# even if FSMonitor says that the mtime of the submodule directory
+# hasn't changed and it could be implicitly marked valid, we must
+# not take that shortcut.  We need to force the recusion into the
+# submodule so that we get a summary of the status *within* the
+# submodule.
+
+create_super () {
+	super="$1" &&
+
+	git init "$super" &&
+	echo x >"$super/file_1" &&
+	echo y >"$super/file_2" &&
+	echo z >"$super/file_3" &&
+	mkdir "$super/dir_1" &&
+	echo a >"$super/dir_1/file_11" &&
+	echo b >"$super/dir_1/file_12" &&
+	mkdir "$super/dir_1/dir_2" &&
+	echo a >"$super/dir_1/dir_2/file_21" &&
+	echo b >"$super/dir_1/dir_2/file_22" &&
+	git -C "$super" add . &&
+	git -C "$super" commit -m "initial $super commit"
+}
+
+create_sub () {
+	sub="$1" &&
+
+	git init "$sub" &&
+	echo x >"$sub/file_x" &&
+	echo y >"$sub/file_y" &&
+	echo z >"$sub/file_z" &&
+	mkdir "$sub/dir_x" &&
+	echo a >"$sub/dir_x/file_a" &&
+	echo b >"$sub/dir_x/file_b" &&
+	mkdir "$sub/dir_x/dir_y" &&
+	echo a >"$sub/dir_x/dir_y/file_a" &&
+	echo b >"$sub/dir_x/dir_y/file_b" &&
+	git -C "$sub" add . &&
+	git -C "$sub" commit -m "initial $sub commit"
+}
+
+my_match_and_clean () {
+	git -C super --no-optional-locks status --porcelain=v2 >actual.with &&
+	git -C super --no-optional-locks -c core.fsmonitor=false \
+		status --porcelain=v2 >actual.without &&
+	test_cmp actual.with actual.without &&
+
+	git -C super --no-optional-locks diff-index --name-status HEAD >actual.with &&
+	git -C super --no-optional-locks -c core.fsmonitor=false \
+		diff-index --name-status HEAD >actual.without &&
+	test_cmp actual.with actual.without &&
+
+	git -C super/dir_1/dir_2/sub reset --hard &&
+	git -C super/dir_1/dir_2/sub clean -d -f
+}
+
+test_expect_success 'submodule setup' '
+	git config --global protocol.file.allow always
+'
+
+test_expect_success 'submodule always visited' '
+	test_when_finished "git -C super fsmonitor--daemon stop; \
+			    rm -rf super; \
+			    rm -rf sub" &&
+
+	create_super super &&
+	create_sub sub &&
+
+	git -C super submodule add ../sub ./dir_1/dir_2/sub &&
+	git -C super commit -m "add sub" &&
+
+	start_daemon -C super &&
+	git -C super config core.fsmonitor true &&
+	git -C super update-index --fsmonitor &&
+	git -C super status &&
+
+	# Now run pairs of commands w/ and w/o FSMonitor while we make
+	# some dirt in the submodule and confirm matching output.
+
+	# Completely clean status.
+	my_match_and_clean &&
+
+	# .M S..U
+	echo z >super/dir_1/dir_2/sub/dir_x/dir_y/foobar_u &&
+	my_match_and_clean &&
+
+	# .M S.M.
+	echo z >super/dir_1/dir_2/sub/dir_x/dir_y/foobar_m &&
+	git -C super/dir_1/dir_2/sub add . &&
+	my_match_and_clean &&
+
+	# .M S.M.
+	echo z >>super/dir_1/dir_2/sub/dir_x/dir_y/file_a &&
+	git -C super/dir_1/dir_2/sub add . &&
+	my_match_and_clean &&
+
+	# .M SC..
+	echo z >>super/dir_1/dir_2/sub/dir_x/dir_y/file_a &&
+	git -C super/dir_1/dir_2/sub add . &&
+	git -C super/dir_1/dir_2/sub commit -m "SC.." &&
+	my_match_and_clean
+'
+
+# If a submodule has a `sub/.git/` directory (rather than a file
+# pointing to the super's `.git/modules/sub`) and `core.fsmonitor`
+# turned on in the submodule and the daemon is not yet started in
+# the submodule, and someone does a `git submodule absorbgitdirs`
+# in the super, Git will recursively invoke `git submodule--helper`
+# to do the work and this may try to read the index.  This will
+# try to start the daemon in the submodule.
+
+test_expect_success "submodule absorbgitdirs implicitly starts daemon" '
+	test_when_finished "rm -rf super; \
+			    rm -rf sub;   \
+			    rm super-sub.trace" &&
+
+	create_super super &&
+	create_sub sub &&
+
+	# Copy rather than submodule add so that we get a .git dir.
+	cp -R ./sub ./super/dir_1/dir_2/sub &&
+
+	git -C super/dir_1/dir_2/sub config core.fsmonitor true &&
+
+	git -C super submodule add ../sub ./dir_1/dir_2/sub &&
+	git -C super commit -m "add sub" &&
+
+	test_path_is_dir super/dir_1/dir_2/sub/.git &&
+
+	cwd="$(cd super && pwd)" &&
+	cat >expect <<-EOF &&
+	Migrating git directory of '\''dir_1/dir_2/sub'\'' from
+	'\''$cwd/dir_1/dir_2/sub/.git'\'' to
+	'\''$cwd/.git/modules/dir_1/dir_2/sub'\''
+	EOF
+	GIT_TRACE2_EVENT="$PWD/super-sub.trace" \
+		git -C super submodule absorbgitdirs >out 2>actual &&
+	test_cmp expect actual &&
+	test_must_be_empty out &&
+
+	# Confirm that the trace2 log contains a record of the
+	# daemon starting.
+	test_subcommand git fsmonitor--daemon start <super-sub.trace
+'
+
+# On a case-insensitive file system, confirm that the daemon
+# notices when the .git directory is moved/renamed/deleted
+# regardless of how it is spelled in the FS event.
+# That is, does the FS event receive the spelling of the
+# operation or does it receive the spelling preserved with
+# the file/directory.
+#
+test_expect_success CASE_INSENSITIVE_FS 'case insensitive+preserving' '
+	test_when_finished "stop_daemon_delete_repo test_insensitive" &&
+
+	git init test_insensitive &&
+
+	start_daemon -C test_insensitive --tf "$PWD/insensitive.trace" &&
+
+	mkdir -p test_insensitive/abc/def &&
+	echo xyz >test_insensitive/ABC/DEF/xyz &&
+
+	test_path_is_dir test_insensitive/.git &&
+	test_path_is_dir test_insensitive/.GIT &&
+
+	# Rename .git using an alternate spelling to verify that
+	# the daemon detects it and automatically shuts down.
+	mv test_insensitive/.GIT test_insensitive/.FOO &&
+
+	# See [1] above.
+	mv test_insensitive/.FOO test_insensitive/.git &&
+
+	verify_implicit_shutdown test_insensitive &&
+
+	# Verify that events were reported using on-disk spellings of the
+	# directories and files that we touched.  We may or may not get a
+	# trailing slash on modified directories.
+	#
+	grep -E "^event: abc/?$"       ./insensitive.trace &&
+	grep -E "^event: abc/def/?$"   ./insensitive.trace &&
+	grep -E "^event: abc/def/xyz$" ./insensitive.trace
+'
+
+# The variable "unicode_debug" is defined in the following library
+# script to dump information about how the (OS, FS) handles Unicode
+# composition.  Uncomment the following line if you want to enable it.
+#
+# unicode_debug=true
+
+. "$TEST_DIRECTORY/lib-unicode-nfc-nfd.sh"
+
+# See if the OS or filesystem does NFC/NFD aliasing/munging.
+#
+# The daemon should err on the side of caution and send BOTH the
+# NFC and NFD forms.  It does not know the original spelling of
+# the pathname (how the user thinks it should be spelled), so
+# emit both and let the client decide (when necessary).  This is
+# similar to "core.precomposeUnicode".
+#
+test_expect_success !UNICODE_COMPOSITION_SENSITIVE 'Unicode nfc/nfd' '
+	test_when_finished "stop_daemon_delete_repo test_unicode" &&
+
+	git init test_unicode &&
+
+	start_daemon -C test_unicode --tf "$PWD/unicode.trace" &&
+
+	# Create a directory using an NFC spelling.
+	#
+	mkdir test_unicode/nfc &&
+	mkdir test_unicode/nfc/c_${utf8_nfc} &&
+
+	# Create a directory using an NFD spelling.
+	#
+	mkdir test_unicode/nfd &&
+	mkdir test_unicode/nfd/d_${utf8_nfd} &&
+
+	test-tool -C test_unicode fsmonitor-client query --token 0 &&
+
+	if test_have_prereq UNICODE_NFC_PRESERVED
+	then
+		# We should have seen NFC event from OS.
+		# We should not have synthesized an NFD event.
+		grep -E    "^event: nfc/c_${utf8_nfc}/?$" ./unicode.trace &&
+		grep -E -v "^event: nfc/c_${utf8_nfd}/?$" ./unicode.trace
+	else
+		# We should have seen NFD event from OS.
+		# We should have synthesized an NFC event.
+		grep -E "^event: nfc/c_${utf8_nfd}/?$" ./unicode.trace &&
+		grep -E "^event: nfc/c_${utf8_nfc}/?$" ./unicode.trace
+	fi &&
+
+	# We assume UNICODE_NFD_PRESERVED.
+	# We should have seen explicit NFD from OS.
+	# We should have synthesized an NFC event.
+	grep -E "^event: nfd/d_${utf8_nfd}/?$" ./unicode.trace &&
+	grep -E "^event: nfd/d_${utf8_nfc}/?$" ./unicode.trace
+'
+
+test_expect_success 'split-index and FSMonitor work well together' '
+	git init split-index &&
+	test_when_finished "git -C \"$PWD/split-index\" \
+		fsmonitor--daemon stop" &&
+	(
+		cd split-index &&
+		git config core.splitIndex true &&
+		# force split-index in most cases
+		git config splitIndex.maxPercentChange 99 &&
+		git config core.fsmonitor true &&
+
+		# Create the following commit topology:
+		#
+		# *   merge three
+		# |\
+		# | * three
+		# * | merge two
+		# |\|
+		# | * two
+		# * | one
+		# |/
+		# * 5a5efd7 initial
+
+		test_commit initial &&
+		test_commit two &&
+		test_commit three &&
+		git reset --hard initial &&
+		test_commit one &&
+		test_tick &&
+		git merge two &&
+		test_tick &&
+		git merge three &&
+
+		git rebase --force-rebase -r one
+	)
+'
+
+# The FSMonitor daemon reports the OBSERVED pathname of modified files
+# and thus contains the OBSERVED spelling on case-insensitive file
+# systems.  The daemon does not (and should not) load the .git/index
+# file and therefore does not know the expected case-spelling.  Since
+# it is possible for the user to create files/subdirectories with the
+# incorrect case, a modified file event for a tracked will not have
+# the EXPECTED case. This can cause `index_name_pos()` to incorrectly
+# report that the file is untracked. This causes the client to fail to
+# mark the file as possibly dirty (keeping the CE_FSMONITOR_VALID bit
+# set) so that `git status` will avoid inspecting it and thus not
+# present in the status output.
+#
+# The setup is a little contrived.
+#
+test_expect_success CASE_INSENSITIVE_FS 'fsmonitor subdir case wrong on disk' '
+	test_when_finished "stop_daemon_delete_repo subdir_case_wrong" &&
+
+	git init subdir_case_wrong &&
+	(
+		cd subdir_case_wrong &&
+		echo x >AAA &&
+		echo x >BBB &&
+
+		mkdir dir1 &&
+		echo x >dir1/file1 &&
+		mkdir dir1/dir2 &&
+		echo x >dir1/dir2/file2 &&
+		mkdir dir1/dir2/dir3 &&
+		echo x >dir1/dir2/dir3/file3 &&
+
+		echo x >yyy &&
+		echo x >zzz &&
+		git add . &&
+		git commit -m "data" &&
+
+		# This will cause "dir1/" and everything under it
+		# to be deleted.
+		git sparse-checkout set --cone --sparse-index &&
+
+		# Create dir2 with the wrong case and then let Git
+		# repopulate dir3 -- it will not correct the spelling
+		# of dir2.
+		mkdir dir1 &&
+		mkdir dir1/DIR2 &&
+		git sparse-checkout add dir1/dir2/dir3
+	) &&
+
+	start_daemon -C subdir_case_wrong --tf "$PWD/subdir_case_wrong.trace" &&
+
+	# Enable FSMonitor in the client. Run enough commands for
+	# the .git/index to sync up with the daemon with everything
+	# marked clean.
+	git -C subdir_case_wrong config core.fsmonitor true &&
+	git -C subdir_case_wrong update-index --fsmonitor &&
+	git -C subdir_case_wrong status &&
+
+	# Make some files dirty so that FSMonitor gets FSEvents for
+	# each of them.
+	echo xx >>subdir_case_wrong/AAA &&
+	echo xx >>subdir_case_wrong/dir1/DIR2/dir3/file3 &&
+	echo xx >>subdir_case_wrong/zzz &&
+
+	GIT_TRACE_FSMONITOR="$PWD/subdir_case_wrong.log" \
+		git -C subdir_case_wrong --no-optional-locks status --short \
+			>"$PWD/subdir_case_wrong.out" &&
+
+	# "git status" should have gotten file events for each of
+	# the 3 files.
+	#
+	# "dir2" should be in the observed case on disk.
+	grep "fsmonitor_refresh_callback" \
+		<"$PWD/subdir_case_wrong.log" \
+		>"$PWD/subdir_case_wrong.log1" &&
+
+	grep -q "AAA.*pos 0" "$PWD/subdir_case_wrong.log1" &&
+	grep -q "zzz.*pos 6" "$PWD/subdir_case_wrong.log1" &&
+
+	grep -q "dir1/DIR2/dir3/file3.*pos -3" "$PWD/subdir_case_wrong.log1" &&
+
+	# Verify that we get a mapping event to correct the case.
+	grep -q "MAP:.*dir1/DIR2/dir3/file3.*dir1/dir2/dir3/file3" \
+		"$PWD/subdir_case_wrong.log1" &&
+
+	# The refresh-callbacks should have caused "git status" to clear
+	# the CE_FSMONITOR_VALID bit on each of those files and caused
+	# the worktree scan to visit them and mark them as modified.
+	grep -q " M AAA" "$PWD/subdir_case_wrong.out" &&
+	grep -q " M zzz" "$PWD/subdir_case_wrong.out" &&
+	grep -q " M dir1/dir2/dir3/file3" "$PWD/subdir_case_wrong.out"
+'
+
+test_expect_success CASE_INSENSITIVE_FS 'fsmonitor file case wrong on disk' '
+	test_when_finished "stop_daemon_delete_repo file_case_wrong" &&
+
+	git init file_case_wrong &&
+	(
+		cd file_case_wrong &&
+		echo x >AAA &&
+		echo x >BBB &&
+
+		mkdir dir1 &&
+		mkdir dir1/dir2 &&
+		mkdir dir1/dir2/dir3 &&
+		echo x >dir1/dir2/dir3/FILE-3-B &&
+		echo x >dir1/dir2/dir3/XXXX-3-X &&
+		echo x >dir1/dir2/dir3/file-3-a &&
+		echo x >dir1/dir2/dir3/yyyy-3-y &&
+		mkdir dir1/dir2/dir4 &&
+		echo x >dir1/dir2/dir4/FILE-4-A &&
+		echo x >dir1/dir2/dir4/XXXX-4-X &&
+		echo x >dir1/dir2/dir4/file-4-b &&
+		echo x >dir1/dir2/dir4/yyyy-4-y &&
+
+		echo x >yyy &&
+		echo x >zzz &&
+		git add . &&
+		git commit -m "data"
+	) &&
+
+	start_daemon -C file_case_wrong --tf "$PWD/file_case_wrong.trace" &&
+
+	# Enable FSMonitor in the client. Run enough commands for
+	# the .git/index to sync up with the daemon with everything
+	# marked clean.
+	git -C file_case_wrong config core.fsmonitor true &&
+	git -C file_case_wrong update-index --fsmonitor &&
+	git -C file_case_wrong status &&
+
+	# Make some files dirty so that FSMonitor gets FSEvents for
+	# each of them.
+	echo xx >>file_case_wrong/AAA &&
+	echo xx >>file_case_wrong/zzz &&
+
+	# Rename some files so that FSMonitor sees a create and delete
+	# FSEvent for each.  (A simple "mv foo FOO" is not portable
+	# between macOS and Windows. It works on both platforms, but makes
+	# the test messy, since (1) one platform updates "ctime" on the
+	# moved file and one does not and (2) it causes a directory event
+	# on one platform and not on the other which causes additional
+	# scanning during "git status" which causes a "H" vs "h" discrepancy
+	# in "git ls-files -f".)  So old-school it and move it out of the
+	# way and copy it to the case-incorrect name so that we get fresh
+	# "ctime" and "mtime" values.
+
+	mv file_case_wrong/dir1/dir2/dir3/file-3-a file_case_wrong/dir1/dir2/dir3/ORIG &&
+	cp file_case_wrong/dir1/dir2/dir3/ORIG     file_case_wrong/dir1/dir2/dir3/FILE-3-A &&
+	rm file_case_wrong/dir1/dir2/dir3/ORIG &&
+	mv file_case_wrong/dir1/dir2/dir4/FILE-4-A file_case_wrong/dir1/dir2/dir4/ORIG &&
+	cp file_case_wrong/dir1/dir2/dir4/ORIG     file_case_wrong/dir1/dir2/dir4/file-4-a &&
+	rm file_case_wrong/dir1/dir2/dir4/ORIG &&
+
+	# Run status enough times to fully sync.
+	#
+	# The first instance should get the create and delete FSEvents
+	# for each pair.  Status should update the index with a new FSM
+	# token (so the next invocation will not see data for these
+	# events).
+
+	GIT_TRACE_FSMONITOR="$PWD/file_case_wrong-try1.log" \
+		git -C file_case_wrong status --short \
+			>"$PWD/file_case_wrong-try1.out" &&
+	grep -q "fsmonitor_refresh_callback.*FILE-3-A.*pos -3" "$PWD/file_case_wrong-try1.log" &&
+	grep -q "fsmonitor_refresh_callback.*file-3-a.*pos 4"  "$PWD/file_case_wrong-try1.log" &&
+	grep -q "fsmonitor_refresh_callback.*FILE-4-A.*pos 6"  "$PWD/file_case_wrong-try1.log" &&
+	grep -q "fsmonitor_refresh_callback.*file-4-a.*pos -9" "$PWD/file_case_wrong-try1.log" &&
+
+	# FSM refresh will have invalidated the FSM bit and cause a regular
+	# (real) scan of these tracked files, so they should have "H" status.
+	# (We will not see a "h" status until the next refresh (on the next
+	# command).)
+
+	git -C file_case_wrong ls-files -f >"$PWD/file_case_wrong-lsf1.out" &&
+	grep -q "H dir1/dir2/dir3/file-3-a" "$PWD/file_case_wrong-lsf1.out" &&
+	grep -q "H dir1/dir2/dir4/FILE-4-A" "$PWD/file_case_wrong-lsf1.out" &&
+
+
+	# Try the status again. We assume that the above status command
+	# advanced the token so that the next one will not see those events.
+
+	GIT_TRACE_FSMONITOR="$PWD/file_case_wrong-try2.log" \
+		git -C file_case_wrong status --short \
+			>"$PWD/file_case_wrong-try2.out" &&
+	! grep -q "fsmonitor_refresh_callback.*FILE-3-A.*pos" "$PWD/file_case_wrong-try2.log" &&
+	! grep -q "fsmonitor_refresh_callback.*file-3-a.*pos" "$PWD/file_case_wrong-try2.log" &&
+	! grep -q "fsmonitor_refresh_callback.*FILE-4-A.*pos" "$PWD/file_case_wrong-try2.log" &&
+	! grep -q "fsmonitor_refresh_callback.*file-4-a.*pos" "$PWD/file_case_wrong-try2.log" &&
+
+	# FSM refresh saw nothing, so it will mark all files as valid,
+	# so they should now have "h" status.
+
+	git -C file_case_wrong ls-files -f >"$PWD/file_case_wrong-lsf2.out" &&
+	grep -q "h dir1/dir2/dir3/file-3-a" "$PWD/file_case_wrong-lsf2.out" &&
+	grep -q "h dir1/dir2/dir4/FILE-4-A" "$PWD/file_case_wrong-lsf2.out" &&
+
+
+	# We now have files with clean content, but with case-incorrect
+	# file names.  Modify them to see if status properly reports
+	# them.
+
+	echo xx >>file_case_wrong/dir1/dir2/dir3/FILE-3-A &&
+	echo xx >>file_case_wrong/dir1/dir2/dir4/file-4-a &&
+
+	GIT_TRACE_FSMONITOR="$PWD/file_case_wrong-try3.log" \
+		git -C file_case_wrong --no-optional-locks status --short \
+			>"$PWD/file_case_wrong-try3.out" &&
+
+	# Verify that we get a mapping event to correct the case.
+	grep -q "fsmonitor_refresh_callback MAP:.*dir1/dir2/dir3/FILE-3-A.*dir1/dir2/dir3/file-3-a" \
+		"$PWD/file_case_wrong-try3.log" &&
+	grep -q "fsmonitor_refresh_callback MAP:.*dir1/dir2/dir4/file-4-a.*dir1/dir2/dir4/FILE-4-A" \
+		"$PWD/file_case_wrong-try3.log" &&
+
+	# FSEvents are in observed case.
+	grep -q "fsmonitor_refresh_callback.*FILE-3-A.*pos -3" "$PWD/file_case_wrong-try3.log" &&
+	grep -q "fsmonitor_refresh_callback.*file-4-a.*pos -9" "$PWD/file_case_wrong-try3.log" &&
+
+	# The refresh-callbacks should have caused "git status" to clear
+	# the CE_FSMONITOR_VALID bit on each of those files and caused
+	# the worktree scan to visit them and mark them as modified.
+	grep -q " M dir1/dir2/dir3/file-3-a" "$PWD/file_case_wrong-try3.out" &&
+	grep -q " M dir1/dir2/dir4/FILE-4-A" "$PWD/file_case_wrong-try3.out"
+'
+
+test_done
diff --git a/t/t7528-signed-commit-ssh.sh b/t/t7528-signed-commit-ssh.sh
new file mode 100755
index 0000000..065f780
--- /dev/null
+++ b/t/t7528-signed-commit-ssh.sh
@@ -0,0 +1,462 @@
+#!/bin/sh
+
+test_description='ssh signed commit tests'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+. ./test-lib.sh
+GNUPGHOME_NOT_USED=$GNUPGHOME
+. "$TEST_DIRECTORY/lib-gpg.sh"
+
+test_expect_success GPGSSH 'create signed commits' '
+	test_oid_cache <<-\EOF &&
+	header sha1:gpgsig
+	header sha256:gpgsig-sha256
+	EOF
+
+	test_when_finished "test_unconfig commit.gpgsign" &&
+	test_config gpg.format ssh &&
+	test_config user.signingkey "${GPGSSH_KEY_PRIMARY}" &&
+
+	echo 1 >file && git add file &&
+	test_tick && git commit -S -m initial &&
+	git tag initial &&
+	git branch side &&
+
+	echo 2 >file && test_tick && git commit -a -S -m second &&
+	git tag second &&
+
+	git checkout side &&
+	echo 3 >elif && git add elif &&
+	test_tick && git commit -m "third on side" &&
+
+	git checkout main &&
+	test_tick && git merge -S side &&
+	git tag merge &&
+
+	echo 4 >file && test_tick && git commit -a -m "fourth unsigned" &&
+	git tag fourth-unsigned &&
+
+	test_tick && git commit --amend -S -m "fourth signed" &&
+	git tag fourth-signed &&
+
+	git config commit.gpgsign true &&
+	echo 5 >file && test_tick && git commit -a -m "fifth signed" &&
+	git tag fifth-signed &&
+
+	git config commit.gpgsign false &&
+	echo 6 >file && test_tick && git commit -a -m "sixth" &&
+	git tag sixth-unsigned &&
+
+	git config commit.gpgsign true &&
+	echo 7 >file && test_tick && git commit -a -m "seventh" --no-gpg-sign &&
+	git tag seventh-unsigned &&
+
+	test_tick && git rebase -f HEAD^^ && git tag sixth-signed HEAD^ &&
+	git tag seventh-signed &&
+
+	echo 8 >file && test_tick && git commit -a -m eighth -S"${GPGSSH_KEY_UNTRUSTED}" &&
+	git tag eighth-signed-alt &&
+
+	# commit.gpgsign is still on but this must not be signed
+	echo 9 | git commit-tree HEAD^{tree} >oid &&
+	test_line_count = 1 oid &&
+	git tag ninth-unsigned $(cat oid) &&
+	# explicit -S of course must sign.
+	echo 10 | git commit-tree -S HEAD^{tree} >oid &&
+	test_line_count = 1 oid &&
+	git tag tenth-signed $(cat oid) &&
+
+	# --gpg-sign[=<key-id>] must sign.
+	echo 11 | git commit-tree --gpg-sign HEAD^{tree} >oid &&
+	test_line_count = 1 oid &&
+	git tag eleventh-signed $(cat oid) &&
+	echo 12 | git commit-tree --gpg-sign="${GPGSSH_KEY_UNTRUSTED}" HEAD^{tree} >oid &&
+	test_line_count = 1 oid &&
+	git tag twelfth-signed-alt $(cat oid) &&
+
+	echo 13>file && test_tick && git commit -a -m thirteenth -S"${GPGSSH_KEY_ECDSA}" &&
+	git tag thirteenth-signed-ecdsa
+'
+
+test_expect_success GPGSSH 'sign commits using literal public keys with ssh-agent' '
+	test_when_finished "test_unconfig commit.gpgsign" &&
+	test_config gpg.format ssh &&
+	eval $(ssh-agent) &&
+	test_when_finished "kill ${SSH_AGENT_PID}" &&
+	ssh-add "${GPGSSH_KEY_PRIMARY}" &&
+	echo 1 >file && git add file &&
+	git commit -a -m rsa-inline -S"$(cat "${GPGSSH_KEY_PRIMARY}.pub")" &&
+	echo 2 >file &&
+	test_config user.signingkey "$(cat "${GPGSSH_KEY_PRIMARY}.pub")" &&
+	git commit -a -m rsa-config -S &&
+	ssh-add "${GPGSSH_KEY_ECDSA}" &&
+	echo 3 >file &&
+	git commit -a -m ecdsa-inline -S"key::$(cat "${GPGSSH_KEY_ECDSA}.pub")" &&
+	echo 4 >file &&
+	test_config user.signingkey "key::$(cat "${GPGSSH_KEY_ECDSA}.pub")" &&
+	git commit -a -m ecdsa-config -S
+'
+
+test_expect_success GPGSSH,GPGSSH_VERIFYTIME 'create signed commits with keys having defined lifetimes' '
+	test_when_finished "test_unconfig commit.gpgsign" &&
+	test_config gpg.format ssh &&
+
+	echo expired >file && test_tick && git commit -a -m expired -S"${GPGSSH_KEY_EXPIRED}" &&
+	git tag expired-signed &&
+
+	echo notyetvalid >file && test_tick && git commit -a -m notyetvalid -S"${GPGSSH_KEY_NOTYETVALID}" &&
+	git tag notyetvalid-signed &&
+
+	echo timeboxedvalid >file && test_tick && git commit -a -m timeboxedvalid -S"${GPGSSH_KEY_TIMEBOXEDVALID}" &&
+	git tag timeboxedvalid-signed &&
+
+	echo timeboxedinvalid >file && test_tick && git commit -a -m timeboxedinvalid -S"${GPGSSH_KEY_TIMEBOXEDINVALID}" &&
+	git tag timeboxedinvalid-signed
+'
+
+test_expect_success GPGSSH 'verify and show signatures' '
+	test_config gpg.ssh.allowedSignersFile "${GPGSSH_ALLOWED_SIGNERS}" &&
+	test_config gpg.mintrustlevel UNDEFINED &&
+	(
+		for commit in initial second merge fourth-signed \
+			fifth-signed sixth-signed seventh-signed tenth-signed \
+			eleventh-signed
+		do
+			git verify-commit $commit &&
+			git show --pretty=short --show-signature $commit >actual &&
+			grep "${GPGSSH_GOOD_SIGNATURE_TRUSTED}" actual &&
+			! grep "${GPGSSH_BAD_SIGNATURE}" actual &&
+			echo $commit OK || exit 1
+		done
+	) &&
+	(
+		for commit in merge^2 fourth-unsigned sixth-unsigned \
+			seventh-unsigned ninth-unsigned
+		do
+			test_must_fail git verify-commit $commit &&
+			git show --pretty=short --show-signature $commit >actual &&
+			! grep "${GPGSSH_GOOD_SIGNATURE_TRUSTED}" actual &&
+			! grep "${GPGSSH_BAD_SIGNATURE}" actual &&
+			echo $commit OK || exit 1
+		done
+	) &&
+	(
+		for commit in eighth-signed-alt twelfth-signed-alt
+		do
+			git show --pretty=short --show-signature $commit >actual &&
+			grep "${GPGSSH_GOOD_SIGNATURE_UNTRUSTED}" actual &&
+			! grep "${GPGSSH_BAD_SIGNATURE}" actual &&
+			grep "${GPGSSH_KEY_NOT_TRUSTED}" actual &&
+			echo $commit OK || exit 1
+		done
+	)
+'
+
+test_expect_success GPGSSH 'verify-commit exits failure on untrusted signature' '
+	test_config gpg.ssh.allowedSignersFile "${GPGSSH_ALLOWED_SIGNERS}" &&
+	test_must_fail git verify-commit eighth-signed-alt 2>actual &&
+	grep "${GPGSSH_GOOD_SIGNATURE_UNTRUSTED}" actual &&
+	! grep "${GPGSSH_BAD_SIGNATURE}" actual &&
+	grep "${GPGSSH_KEY_NOT_TRUSTED}" actual
+'
+
+test_expect_success GPGSSH,GPGSSH_VERIFYTIME 'verify-commit exits failure on expired signature key' '
+	test_config gpg.ssh.allowedSignersFile "${GPGSSH_ALLOWED_SIGNERS}" &&
+	test_must_fail git verify-commit expired-signed 2>actual &&
+	! grep "${GPGSSH_GOOD_SIGNATURE_TRUSTED}" actual
+'
+
+test_expect_success GPGSSH,GPGSSH_VERIFYTIME 'verify-commit exits failure on not yet valid signature key' '
+	test_config gpg.ssh.allowedSignersFile "${GPGSSH_ALLOWED_SIGNERS}" &&
+	test_must_fail git verify-commit notyetvalid-signed 2>actual &&
+	! grep "${GPGSSH_GOOD_SIGNATURE_TRUSTED}" actual
+'
+
+test_expect_success GPGSSH,GPGSSH_VERIFYTIME 'verify-commit succeeds with commit date and key validity matching' '
+	test_config gpg.ssh.allowedSignersFile "${GPGSSH_ALLOWED_SIGNERS}" &&
+	git verify-commit timeboxedvalid-signed 2>actual &&
+	grep "${GPGSSH_GOOD_SIGNATURE_TRUSTED}" actual &&
+	! grep "${GPGSSH_BAD_SIGNATURE}" actual
+'
+
+test_expect_success GPGSSH,GPGSSH_VERIFYTIME 'verify-commit exits failure with commit date outside of key validity' '
+	test_config gpg.ssh.allowedSignersFile "${GPGSSH_ALLOWED_SIGNERS}" &&
+	test_must_fail git verify-commit timeboxedinvalid-signed 2>actual &&
+	! grep "${GPGSSH_GOOD_SIGNATURE_TRUSTED}" actual
+'
+
+test_expect_success GPGSSH 'verify-commit exits success with matching minTrustLevel' '
+	test_config gpg.ssh.allowedSignersFile "${GPGSSH_ALLOWED_SIGNERS}" &&
+	test_config gpg.minTrustLevel fully &&
+	git verify-commit sixth-signed
+'
+
+test_expect_success GPGSSH 'verify-commit exits success with low minTrustLevel' '
+	test_config gpg.ssh.allowedSignersFile "${GPGSSH_ALLOWED_SIGNERS}" &&
+	test_config gpg.minTrustLevel marginal &&
+	git verify-commit sixth-signed
+'
+
+test_expect_success GPGSSH 'verify-commit exits failure with high minTrustLevel' '
+	test_config gpg.minTrustLevel ultimate &&
+	test_must_fail git verify-commit eighth-signed-alt
+'
+
+test_expect_success GPGSSH 'verify signatures with --raw' '
+	test_config gpg.ssh.allowedSignersFile "${GPGSSH_ALLOWED_SIGNERS}" &&
+	(
+		for commit in initial second merge fourth-signed fifth-signed sixth-signed seventh-signed
+		do
+			git verify-commit --raw $commit 2>actual &&
+			grep "${GPGSSH_GOOD_SIGNATURE_TRUSTED}" actual &&
+			! grep "${GPGSSH_BAD_SIGNATURE}" actual &&
+			echo $commit OK || exit 1
+		done
+	) &&
+	(
+		for commit in merge^2 fourth-unsigned sixth-unsigned seventh-unsigned
+		do
+			test_must_fail git verify-commit --raw $commit 2>actual &&
+			! grep "${GPGSSH_GOOD_SIGNATURE_TRUSTED}" actual &&
+			! grep "${GPGSSH_BAD_SIGNATURE}" actual &&
+			echo $commit OK || exit 1
+		done
+	) &&
+	(
+		for commit in eighth-signed-alt
+		do
+			test_must_fail git verify-commit --raw $commit 2>actual &&
+			grep "${GPGSSH_GOOD_SIGNATURE_UNTRUSTED}" actual &&
+			! grep "${GPGSSH_BAD_SIGNATURE}" actual &&
+			echo $commit OK || exit 1
+		done
+	)
+'
+
+test_expect_success GPGSSH 'proper header is used for hash algorithm' '
+	git cat-file commit fourth-signed >output &&
+	grep "^$(test_oid header) -----BEGIN SSH SIGNATURE-----" output
+'
+
+test_expect_success GPGSSH 'show signed commit with signature' '
+	test_config gpg.ssh.allowedSignersFile "${GPGSSH_ALLOWED_SIGNERS}" &&
+	git show -s initial >commit &&
+	git show -s --show-signature initial >show &&
+	git verify-commit -v initial >verify.1 2>verify.2 &&
+	git cat-file commit initial >cat &&
+	grep -v -e "${GPGSSH_GOOD_SIGNATURE_TRUSTED}" -e "Warning: " show >show.commit &&
+	grep -e "${GPGSSH_GOOD_SIGNATURE_TRUSTED}" -e "Warning: " show >show.gpg &&
+	grep -v "^ " cat | grep -v "^gpgsig.* " >cat.commit &&
+	test_cmp show.commit commit &&
+	test_cmp show.gpg verify.2 &&
+	test_cmp cat.commit verify.1
+'
+
+test_expect_success GPGSSH 'detect fudged signature' '
+	test_config gpg.ssh.allowedSignersFile "${GPGSSH_ALLOWED_SIGNERS}" &&
+	git cat-file commit seventh-signed >raw &&
+	sed -e "s/^seventh/7th forged/" raw >forged1 &&
+	git hash-object -w -t commit forged1 >forged1.commit &&
+	test_must_fail git verify-commit $(cat forged1.commit) &&
+	git show --pretty=short --show-signature $(cat forged1.commit) >actual1 &&
+	grep "${GPGSSH_BAD_SIGNATURE}" actual1 &&
+	! grep "${GPGSSH_GOOD_SIGNATURE_TRUSTED}" actual1 &&
+	! grep "${GPGSSH_GOOD_SIGNATURE_UNTRUSTED}" actual1
+'
+
+test_expect_success GPGSSH 'detect fudged signature with NUL' '
+	test_config gpg.ssh.allowedSignersFile "${GPGSSH_ALLOWED_SIGNERS}" &&
+	git cat-file commit seventh-signed >raw &&
+	cat raw >forged2 &&
+	echo Qwik | tr "Q" "\000" >>forged2 &&
+	git hash-object --literally -w -t commit forged2 >forged2.commit &&
+	test_must_fail git verify-commit $(cat forged2.commit) &&
+	git show --pretty=short --show-signature $(cat forged2.commit) >actual2 &&
+	grep "${GPGSSH_BAD_SIGNATURE}" actual2 &&
+	! grep "${GPGSSH_GOOD_SIGNATURE_TRUSTED}" actual2
+'
+
+test_expect_success GPGSSH 'amending already signed commit' '
+	test_config gpg.format ssh &&
+	test_config user.signingkey "${GPGSSH_KEY_PRIMARY}" &&
+	test_config gpg.ssh.allowedSignersFile "${GPGSSH_ALLOWED_SIGNERS}" &&
+	git checkout -f fourth-signed^0 &&
+	git commit --amend -S --no-edit &&
+	git verify-commit HEAD &&
+	git show -s --show-signature HEAD >actual &&
+	grep "${GPGSSH_GOOD_SIGNATURE_TRUSTED}" actual &&
+	! grep "${GPGSSH_BAD_SIGNATURE}" actual
+'
+
+test_expect_success GPGSSH 'show good signature with custom format' '
+	test_config gpg.ssh.allowedSignersFile "${GPGSSH_ALLOWED_SIGNERS}" &&
+	FINGERPRINT=$(ssh-keygen -lf "${GPGSSH_KEY_PRIMARY}" | awk "{print \$2;}") &&
+	cat >expect.tmpl <<-\EOF &&
+	G
+	FINGERPRINT
+	principal with number 1
+	FINGERPRINT
+
+	EOF
+	sed "s|FINGERPRINT|$FINGERPRINT|g" expect.tmpl >expect &&
+	git log -1 --format="%G?%n%GK%n%GS%n%GF%n%GP" sixth-signed >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success GPGSSH 'show bad signature with custom format' '
+	test_config gpg.ssh.allowedSignersFile "${GPGSSH_ALLOWED_SIGNERS}" &&
+	cat >expect <<-\EOF &&
+	B
+
+
+
+
+	EOF
+	git log -1 --format="%G?%n%GK%n%GS%n%GF%n%GP" $(cat forged1.commit) >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success GPGSSH 'show untrusted signature with custom format' '
+	test_config gpg.ssh.allowedSignersFile "${GPGSSH_ALLOWED_SIGNERS}" &&
+	cat >expect.tmpl <<-\EOF &&
+	U
+	FINGERPRINT
+
+	FINGERPRINT
+
+	EOF
+	git log -1 --format="%G?%n%GK%n%GS%n%GF%n%GP" eighth-signed-alt >actual &&
+	FINGERPRINT=$(ssh-keygen -lf "${GPGSSH_KEY_UNTRUSTED}" | awk "{print \$2;}") &&
+	sed "s|FINGERPRINT|$FINGERPRINT|g" expect.tmpl >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success GPGSSH 'show untrusted signature with undefined trust level' '
+	test_config gpg.ssh.allowedSignersFile "${GPGSSH_ALLOWED_SIGNERS}" &&
+	cat >expect.tmpl <<-\EOF &&
+	undefined
+	FINGERPRINT
+
+	FINGERPRINT
+
+	EOF
+	git log -1 --format="%GT%n%GK%n%GS%n%GF%n%GP" eighth-signed-alt >actual &&
+	FINGERPRINT=$(ssh-keygen -lf "${GPGSSH_KEY_UNTRUSTED}" | awk "{print \$2;}") &&
+	sed "s|FINGERPRINT|$FINGERPRINT|g" expect.tmpl >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success GPGSSH 'show untrusted signature with ultimate trust level' '
+	test_config gpg.ssh.allowedSignersFile "${GPGSSH_ALLOWED_SIGNERS}" &&
+	cat >expect.tmpl <<-\EOF &&
+	fully
+	FINGERPRINT
+	principal with number 1
+	FINGERPRINT
+
+	EOF
+	git log -1 --format="%GT%n%GK%n%GS%n%GF%n%GP" sixth-signed >actual &&
+	FINGERPRINT=$(ssh-keygen -lf "${GPGSSH_KEY_PRIMARY}" | awk "{print \$2;}") &&
+	sed "s|FINGERPRINT|$FINGERPRINT|g" expect.tmpl >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success GPGSSH 'show lack of signature with custom format' '
+	cat >expect <<-\EOF &&
+	N
+
+
+
+
+	EOF
+	git log -1 --format="%G?%n%GK%n%GS%n%GF%n%GP" seventh-unsigned >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success GPGSSH 'log.showsignature behaves like --show-signature' '
+	test_config gpg.ssh.allowedSignersFile "${GPGSSH_ALLOWED_SIGNERS}" &&
+	test_config log.showsignature true &&
+	git show initial >actual &&
+	grep "${GPGSSH_GOOD_SIGNATURE_TRUSTED}" actual
+'
+
+test_expect_success GPGSSH 'check config gpg.format values' '
+	test_config gpg.format ssh &&
+	test_config user.signingkey "${GPGSSH_KEY_PRIMARY}" &&
+	test_config gpg.format ssh &&
+	git commit -S --amend -m "success" &&
+	test_config gpg.format OpEnPgP &&
+	test_must_fail git commit -S --amend -m "fail"
+'
+
+test_expect_failure GPGSSH 'detect fudged commit with double signature (TODO)' '
+	sed -e "/gpgsig/,/END PGP/d" forged1 >double-base &&
+	sed -n -e "/gpgsig/,/END PGP/p" forged1 | \
+		sed -e "s/^$(test_oid header)//;s/^ //" | gpg --dearmor >double-sig1.sig &&
+	gpg -o double-sig2.sig -u 29472784 --detach-sign double-base &&
+	cat double-sig1.sig double-sig2.sig | gpg --enarmor >double-combined.asc &&
+	sed -e "s/^\(-.*\)ARMORED FILE/\1SIGNATURE/;1s/^/$(test_oid header) /;2,\$s/^/ /" \
+		double-combined.asc > double-gpgsig &&
+	sed -e "/committer/r double-gpgsig" double-base >double-commit &&
+	git hash-object -w -t commit double-commit >double-commit.commit &&
+	test_must_fail git verify-commit $(cat double-commit.commit) &&
+	git show --pretty=short --show-signature $(cat double-commit.commit) >double-actual &&
+	grep "BAD signature from" double-actual &&
+	grep "Good signature from" double-actual
+'
+
+test_expect_failure GPGSSH 'show double signature with custom format (TODO)' '
+	cat >expect <<-\EOF &&
+	E
+
+
+
+
+	EOF
+	git log -1 --format="%G?%n%GK%n%GS%n%GF%n%GP" $(cat double-commit.commit) >actual &&
+	test_cmp expect actual
+'
+
+
+test_expect_failure GPGSSH 'verify-commit verifies multiply signed commits (TODO)' '
+	git init multiply-signed &&
+	cd multiply-signed &&
+	test_commit first &&
+	echo 1 >second &&
+	git add second &&
+	tree=$(git write-tree) &&
+	parent=$(git rev-parse HEAD^{commit}) &&
+	git commit --gpg-sign -m second &&
+	git cat-file commit HEAD &&
+	# Avoid trailing whitespace.
+	sed -e "s/^Q//" -e "s/^Z/ /" >commit <<-EOF &&
+	Qtree $tree
+	Qparent $parent
+	Qauthor A U Thor <author@example.com> 1112912653 -0700
+	Qcommitter C O Mitter <committer@example.com> 1112912653 -0700
+	Qgpgsig -----BEGIN PGP SIGNATURE-----
+	QZ
+	Q iHQEABECADQWIQRz11h0S+chaY7FTocTtvUezd5DDQUCX/uBDRYcY29tbWl0dGVy
+	Q QGV4YW1wbGUuY29tAAoJEBO29R7N3kMNd+8AoK1I8mhLHviPH+q2I5fIVgPsEtYC
+	Q AKCTqBh+VabJceXcGIZuF0Ry+udbBQ==
+	Q =tQ0N
+	Q -----END PGP SIGNATURE-----
+	Qgpgsig-sha256 -----BEGIN PGP SIGNATURE-----
+	QZ
+	Q iHQEABECADQWIQRz11h0S+chaY7FTocTtvUezd5DDQUCX/uBIBYcY29tbWl0dGVy
+	Q QGV4YW1wbGUuY29tAAoJEBO29R7N3kMN/NEAn0XO9RYSBj2dFyozi0JKSbssYMtO
+	Q AJwKCQ1BQOtuwz//IjU8TiS+6S4iUw==
+	Q =pIwP
+	Q -----END PGP SIGNATURE-----
+	Q
+	Qsecond
+	EOF
+	head=$(git hash-object -t commit -w commit) &&
+	git reset --hard $head &&
+	git verify-commit $head 2>actual &&
+	grep "Good signature from" actual &&
+	! grep "BAD signature from" actual
+'
+
+test_done
diff --git a/t/t7600-merge.sh b/t/t7600-merge.sh
index 1c85f75..e5ff073 100755
--- a/t/t7600-merge.sh
+++ b/t/t7600-merge.sh
@@ -14,9 +14,9 @@ Testing basic merge operations/option parsing.
     ! [c4] c4
      ! [c5] c5
       ! [c6] c6
-       * [master] Merge commit 'c1'
+       * [main] Merge commit 'c1'
 --------
-       - [master] Merge commit 'c1'
+       - [main] Merge commit 'c1'
  +     * [c1] commit 1
       +  [c6] c6
      +   [c5] c5
@@ -26,6 +26,9 @@ Testing basic merge operations/option parsing.
 +++++++* [c0] commit 0
 '
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-gpg.sh
 
@@ -102,7 +105,7 @@ verify_mergeheads () {
 	test_write_lines "$@" >mergehead.expected &&
 	while read sha1 rest
 	do
-		git rev-parse $sha1
+		git rev-parse $sha1 || return 1
 	done <.git/MERGE_HEAD >mergehead.actual &&
 	test_cmp mergehead.expected mergehead.actual
 }
@@ -119,6 +122,8 @@ test_expect_success 'setup' '
 	c0=$(git rev-parse HEAD) &&
 	cp file.1 file &&
 	git add file &&
+	cp file.1 other &&
+	git add other &&
 	test_tick &&
 	git commit -m "commit 1" &&
 	git tag c1 &&
@@ -170,7 +175,7 @@ test_expect_success 'merge -h with invalid index' '
 		>.git/index &&
 		test_expect_code 129 git merge -h 2>usage
 	) &&
-	test_i18ngrep "[Uu]sage: git merge" broken/usage
+	test_grep "[Uu]sage: git merge" broken/usage
 '
 
 test_expect_success 'reject non-strategy with a git-merge-foo name' '
@@ -203,13 +208,13 @@ test_expect_success 'merge c0 with c1 with --ff-only' '
 test_debug 'git log --graph --decorate --oneline --all'
 
 test_expect_success 'merge from unborn branch' '
-	git checkout -f master &&
+	git checkout -f main &&
 	test_might_fail git branch -D kid &&
 
 	echo "OBJID HEAD@{0}: initial pull" >reflog.expected &&
 
 	git checkout --orphan kid &&
-	test_when_finished "git checkout -f master" &&
+	test_when_finished "git checkout -f main" &&
 	git rm -fr . &&
 	test_tick &&
 	git merge --ff-only c1 &&
@@ -250,6 +255,15 @@ test_expect_success 'merge --squash c3 with c7' '
 	test_cmp expect actual
 '
 
+test_expect_success 'merge --squash --autostash conflict does not attempt to apply autostash' '
+	git reset --hard c3 &&
+	>unrelated &&
+	git add unrelated &&
+	test_must_fail git merge --squash c7 --autostash >out 2>err &&
+	! grep "Applying autostash resulted in conflicts." err &&
+	grep "When finished, apply stashed changes with \`git stash pop\`" out
+'
+
 test_expect_success 'merge c3 with c7 with commit.cleanup = scissors' '
 	git config commit.cleanup scissors &&
 	git reset --hard c3 &&
@@ -269,7 +283,7 @@ test_expect_success 'merge c3 with c7 with commit.cleanup = scissors' '
 	EOF
 	git cat-file commit HEAD >raw &&
 	sed -e "1,/^$/d" raw >actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 test_expect_success 'merge c3 with c7 with --squash commit.cleanup = scissors' '
@@ -293,7 +307,7 @@ test_expect_success 'merge c3 with c7 with --squash commit.cleanup = scissors' '
 	EOF
 	git cat-file commit HEAD >raw &&
 	sed -e "1,/^$/d" raw >actual &&
-	test_i18ncmp expect actual
+	test_cmp expect actual
 '
 
 test_debug 'git log --graph --decorate --oneline --all'
@@ -413,7 +427,7 @@ test_debug 'git log --graph --decorate --oneline --all'
 
 test_expect_success 'merge c1 with c2 (no-commit in config)' '
 	git reset --hard c1 &&
-	test_config branch.master.mergeoptions "--no-commit" &&
+	test_config branch.main.mergeoptions "--no-commit" &&
 	git merge c2 &&
 	verify_merge file result.1-5 &&
 	verify_head $c1 &&
@@ -427,7 +441,7 @@ test_expect_success 'merge c1 with c2 (log in config)' '
 	git merge --log c2 &&
 	git show -s --pretty=tformat:%s%n%b >expect &&
 
-	test_config branch.master.mergeoptions "--log" &&
+	test_config branch.main.mergeoptions "--log" &&
 	git reset --hard c1 &&
 	git merge c2 &&
 	git show -s --pretty=tformat:%s%n%b >actual &&
@@ -440,7 +454,7 @@ test_expect_success 'merge c1 with c2 (log in config gets overridden)' '
 	git merge c2 &&
 	git show -s --pretty=tformat:%s%n%b >expect &&
 
-	test_config branch.master.mergeoptions "--no-log" &&
+	test_config branch.main.mergeoptions "--no-log" &&
 	test_config merge.log "true" &&
 	git reset --hard c1 &&
 	git merge c2 &&
@@ -451,7 +465,7 @@ test_expect_success 'merge c1 with c2 (log in config gets overridden)' '
 
 test_expect_success 'merge c1 with c2 (squash in config)' '
 	git reset --hard c1 &&
-	test_config branch.master.mergeoptions "--squash" &&
+	test_config branch.main.mergeoptions "--squash" &&
 	git merge c2 &&
 	verify_merge file result.1-5 &&
 	verify_head $c1 &&
@@ -463,7 +477,7 @@ test_debug 'git log --graph --decorate --oneline --all'
 
 test_expect_success 'override config option -n with --summary' '
 	git reset --hard c1 &&
-	test_config branch.master.mergeoptions "-n" &&
+	test_config branch.main.mergeoptions "-n" &&
 	test_tick &&
 	git merge --summary c2 >diffstat.txt &&
 	verify_merge file result.1-5 msg.1-5 &&
@@ -477,7 +491,7 @@ test_expect_success 'override config option -n with --summary' '
 
 test_expect_success 'override config option -n with --stat' '
 	git reset --hard c1 &&
-	test_config branch.master.mergeoptions "-n" &&
+	test_config branch.main.mergeoptions "-n" &&
 	test_tick &&
 	git merge --stat c2 >diffstat.txt &&
 	verify_merge file result.1-5 msg.1-5 &&
@@ -493,7 +507,7 @@ test_debug 'git log --graph --decorate --oneline --all'
 
 test_expect_success 'override config option --stat' '
 	git reset --hard c1 &&
-	test_config branch.master.mergeoptions "--stat" &&
+	test_config branch.main.mergeoptions "--stat" &&
 	test_tick &&
 	git merge -n c2 >diffstat.txt &&
 	verify_merge file result.1-5 msg.1-5 &&
@@ -509,7 +523,7 @@ test_debug 'git log --graph --decorate --oneline --all'
 
 test_expect_success 'merge c1 with c2 (override --no-commit)' '
 	git reset --hard c1 &&
-	test_config branch.master.mergeoptions "--no-commit" &&
+	test_config branch.main.mergeoptions "--no-commit" &&
 	test_tick &&
 	git merge --commit c2 &&
 	verify_merge file result.1-5 msg.1-5 &&
@@ -520,7 +534,7 @@ test_debug 'git log --graph --decorate --oneline --all'
 
 test_expect_success 'merge c1 with c2 (override --squash)' '
 	git reset --hard c1 &&
-	test_config branch.master.mergeoptions "--squash" &&
+	test_config branch.main.mergeoptions "--squash" &&
 	test_tick &&
 	git merge --no-squash c2 &&
 	verify_merge file result.1-5 msg.1-5 &&
@@ -549,9 +563,9 @@ test_expect_success 'merge c0 with c1 (merge.ff=false)' '
 '
 test_debug 'git log --graph --decorate --oneline --all'
 
-test_expect_success 'combine branch.master.mergeoptions with merge.ff' '
+test_expect_success 'combine branch.main.mergeoptions with merge.ff' '
 	git reset --hard c0 &&
-	test_config branch.master.mergeoptions "--ff" &&
+	test_config branch.main.mergeoptions "--ff" &&
 	test_config merge.ff "false" &&
 	test_tick &&
 	git merge c1 &&
@@ -593,7 +607,7 @@ test_expect_success 'option --no-ff overrides merge.ff=only config' '
 
 test_expect_success 'merge c0 with c1 (ff overrides no-ff)' '
 	git reset --hard c0 &&
-	test_config branch.master.mergeoptions "--no-ff" &&
+	test_config branch.main.mergeoptions "--no-ff" &&
 	git merge --ff c1 &&
 	verify_merge file result.1 &&
 	verify_head $c1
@@ -606,7 +620,7 @@ test_expect_success 'merge log message' '
 	test_must_be_empty msg.act &&
 
 	git reset --hard c0 &&
-	test_config branch.master.mergeoptions "--no-ff" &&
+	test_config branch.main.mergeoptions "--no-ff" &&
 	git merge --no-log c2 &&
 	git show -s --pretty=format:%b HEAD >msg.act &&
 	test_must_be_empty msg.act &&
@@ -625,41 +639,41 @@ test_expect_success 'merge log message' '
 test_debug 'git log --graph --decorate --oneline --all'
 
 test_expect_success 'merge c1 with c0, c2, c0, and c1' '
-       git reset --hard c1 &&
-       test_tick &&
-       git merge c0 c2 c0 c1 &&
-       verify_merge file result.1-5 &&
-       verify_parents $c1 $c2
+	git reset --hard c1 &&
+	test_tick &&
+	git merge c0 c2 c0 c1 &&
+	verify_merge file result.1-5 &&
+	verify_parents $c1 $c2
 '
 
 test_debug 'git log --graph --decorate --oneline --all'
 
 test_expect_success 'merge c1 with c0, c2, c0, and c1' '
-       git reset --hard c1 &&
-       test_tick &&
-       git merge c0 c2 c0 c1 &&
-       verify_merge file result.1-5 &&
-       verify_parents $c1 $c2
+	git reset --hard c1 &&
+	test_tick &&
+	git merge c0 c2 c0 c1 &&
+	verify_merge file result.1-5 &&
+	verify_parents $c1 $c2
 '
 
 test_debug 'git log --graph --decorate --oneline --all'
 
 test_expect_success 'merge c1 with c1 and c2' '
-       git reset --hard c1 &&
-       test_tick &&
-       git merge c1 c2 &&
-       verify_merge file result.1-5 &&
-       verify_parents $c1 $c2
+	git reset --hard c1 &&
+	test_tick &&
+	git merge c1 c2 &&
+	verify_merge file result.1-5 &&
+	verify_parents $c1 $c2
 '
 
 test_debug 'git log --graph --decorate --oneline --all'
 
 test_expect_success 'merge fast-forward in a dirty tree' '
-       git reset --hard c0 &&
-       mv file file1 &&
-       cat file1 >file &&
-       rm -f file1 &&
-       git merge c2
+	git reset --hard c0 &&
+	mv file file1 &&
+	cat file1 >file &&
+	rm -f file1 &&
+	git merge c2
 '
 
 test_debug 'git log --graph --decorate --oneline --all'
@@ -667,7 +681,7 @@ test_debug 'git log --graph --decorate --oneline --all'
 test_expect_success 'in-index merge' '
 	git reset --hard c0 &&
 	git merge --no-ff -s resolve c1 >out &&
-	test_i18ngrep "Wonderful." out &&
+	test_grep "Wonderful." out &&
 	verify_parents $c0 $c1
 '
 
@@ -683,7 +697,7 @@ test_expect_success 'merge with --autostash' '
 	git reset --hard c1 &&
 	git merge-file file file.orig file.9 &&
 	git merge --autostash c2 2>err &&
-	test_i18ngrep "Applied autostash." err &&
+	test_grep "Applied autostash." err &&
 	git show HEAD:file >merge-result &&
 	test_cmp result.1-5 merge-result &&
 	test_cmp result.1-5-9 file
@@ -694,7 +708,7 @@ test_expect_success 'merge with merge.autoStash' '
 	git reset --hard c1 &&
 	git merge-file file file.orig file.9 &&
 	git merge c2 2>err &&
-	test_i18ngrep "Applied autostash." err &&
+	test_grep "Applied autostash." err &&
 	git show HEAD:file >merge-result &&
 	test_cmp result.1-5 merge-result &&
 	test_cmp result.1-5-9 file
@@ -704,26 +718,44 @@ test_expect_success 'fast-forward merge with --autostash' '
 	git reset --hard c0 &&
 	git merge-file file file.orig file.5 &&
 	git merge --autostash c1 2>err &&
-	test_i18ngrep "Applied autostash." err &&
+	test_grep "Applied autostash." err &&
 	test_cmp result.1-5 file
 '
 
+test_expect_success 'failed fast-forward merge with --autostash' '
+	git reset --hard c0 &&
+	git merge-file file file.orig file.5 &&
+	cp file.5 other &&
+	test_when_finished "rm other" &&
+	test_must_fail git merge --autostash c1 2>err &&
+	test_grep "Applied autostash." err &&
+	test_cmp file.5 file
+'
+
 test_expect_success 'octopus merge with --autostash' '
 	git reset --hard c1 &&
 	git merge-file file file.orig file.3 &&
 	git merge --autostash c2 c3 2>err &&
-	test_i18ngrep "Applied autostash." err &&
+	test_grep "Applied autostash." err &&
 	git show HEAD:file >merge-result &&
 	test_cmp result.1-5-9 merge-result &&
 	test_cmp result.1-3-5-9 file
 '
 
+test_expect_success 'failed merge (exit 2) with --autostash' '
+	git reset --hard c1 &&
+	git merge-file file file.orig file.5 &&
+	test_must_fail git merge -s recursive --autostash c2 c3 2>err &&
+	test_grep "Applied autostash." err &&
+	test_cmp result.1-5 file
+'
+
 test_expect_success 'conflicted merge with --autostash, --abort restores stash' '
 	git reset --hard c3 &&
 	cp file.1 file &&
 	test_must_fail git merge --autostash c7 &&
 	git merge --abort 2>err &&
-	test_i18ngrep "Applied autostash." err &&
+	test_grep "Applied autostash." err &&
 	test_cmp file.1 file
 '
 
@@ -735,7 +767,7 @@ test_expect_success 'completed merge (git commit) with --no-commit and --autosta
 	git stash show -p MERGE_AUTOSTASH >actual &&
 	test_cmp expect actual &&
 	git commit 2>err &&
-	test_i18ngrep "Applied autostash." err &&
+	test_grep "Applied autostash." err &&
 	git show HEAD:file >merge-result &&
 	test_cmp result.1-5 merge-result &&
 	test_cmp result.1-5-9 file
@@ -749,7 +781,7 @@ test_expect_success 'completed merge (git merge --continue) with --no-commit and
 	git stash show -p MERGE_AUTOSTASH >actual &&
 	test_cmp expect actual &&
 	git merge --continue 2>err &&
-	test_i18ngrep "Applied autostash." err &&
+	test_grep "Applied autostash." err &&
 	git show HEAD:file >merge-result &&
 	test_cmp result.1-5 merge-result &&
 	test_cmp result.1-5-9 file
@@ -763,7 +795,7 @@ test_expect_success 'aborted merge (merge --abort) with --no-commit and --autost
 	git stash show -p MERGE_AUTOSTASH >actual &&
 	test_cmp expect actual &&
 	git merge --abort 2>err &&
-	test_i18ngrep "Applied autostash." err &&
+	test_grep "Applied autostash." err &&
 	git diff >actual &&
 	test_cmp expect actual
 '
@@ -776,7 +808,7 @@ test_expect_success 'aborted merge (reset --hard) with --no-commit and --autosta
 	git stash show -p MERGE_AUTOSTASH >actual &&
 	test_cmp expect actual &&
 	git reset --hard 2>err &&
-	test_i18ngrep "Autostash exists; creating a new stash entry." err &&
+	test_grep "Autostash exists; creating a new stash entry." err &&
 	git diff --exit-code
 '
 
@@ -789,7 +821,7 @@ test_expect_success 'quit merge with --no-commit and --autostash' '
 	test_cmp expect actual &&
 	git diff HEAD >expect &&
 	git merge --quit 2>err &&
-	test_i18ngrep "Autostash exists; creating a new stash entry." err &&
+	test_grep "Autostash exists; creating a new stash entry." err &&
 	git diff HEAD >actual &&
 	test_cmp expect actual
 '
@@ -800,7 +832,7 @@ test_expect_success 'merge with conflicted --autostash changes' '
 	git diff >expect &&
 	test_when_finished "test_might_fail git stash drop" &&
 	git merge --autostash c3 2>err &&
-	test_i18ngrep "Applying autostash resulted in conflicts." err &&
+	test_grep "Applying autostash resulted in conflicts." err &&
 	git show HEAD:file >merge-result &&
 	test_cmp result.1-9 merge-result &&
 	git stash show -p >actual &&
@@ -944,16 +976,16 @@ test_expect_success 'set up mod-256 conflict scenario' '
 	# 256 near-identical stanzas...
 	for i in $(test_seq 1 256); do
 		for j in 1 2 3 4 5; do
-			echo $i-$j
+			echo $i-$j || return 1
 		done
 	done >file &&
 	git add file &&
 	git commit -m base &&
 
-	# one side changes the first line of each to "master"
-	sed s/-1/-master/ file >tmp &&
+	# one side changes the first line of each to "main"
+	sed s/-1/-main/ file >tmp &&
 	mv tmp file &&
-	git commit -am master &&
+	git commit -am main &&
 
 	# and the other to "side"; merging the two will
 	# yield 256 separate conflicts
@@ -965,12 +997,12 @@ test_expect_success 'set up mod-256 conflict scenario' '
 
 test_expect_success 'merge detects mod-256 conflicts (recursive)' '
 	git reset --hard &&
-	test_must_fail git merge -s recursive master
+	test_must_fail git merge -s recursive main
 '
 
 test_expect_success 'merge detects mod-256 conflicts (resolve)' '
 	git reset --hard &&
-	test_must_fail git merge -s resolve master
+	test_must_fail git merge -s resolve main
 '
 
 test_expect_success 'merge nothing into void' '
diff --git a/t/t7601-merge-pull-config.sh b/t/t7601-merge-pull-config.sh
index 0f97828..a94387a 100755
--- a/t/t7601-merge-pull-config.sh
+++ b/t/t7601-merge-pull-config.sh
@@ -2,7 +2,7 @@
 
 test_description='git merge
 
-Testing pull.* configuration parsing.'
+Testing pull.* configuration parsing and other things.'
 
 . ./test-lib.sh
 
@@ -27,53 +27,335 @@ test_expect_success 'setup' '
 	git tag c3
 '
 
-test_expect_success 'pull.rebase not set' '
+test_expect_success 'pull.rebase not set, ff possible' '
 	git reset --hard c0 &&
 	git pull . c1 2>err &&
-	test_i18ngrep "Pulling without specifying how to reconcile" err
+	test_grep ! "You have divergent branches" err
+'
+
+test_expect_success 'pull.rebase not set and pull.ff=true' '
+	git reset --hard c0 &&
+	test_config pull.ff true &&
+	git pull . c1 2>err &&
+	test_grep ! "You have divergent branches" err
 '
 
 test_expect_success 'pull.rebase not set and pull.ff=false' '
 	git reset --hard c0 &&
 	test_config pull.ff false &&
 	git pull . c1 2>err &&
-	test_i18ngrep "Pulling without specifying how to reconcile" err
+	test_grep ! "You have divergent branches" err
 '
 
 test_expect_success 'pull.rebase not set and pull.ff=only' '
 	git reset --hard c0 &&
 	test_config pull.ff only &&
 	git pull . c1 2>err &&
-	test_i18ngrep ! "Pulling without specifying how to reconcile" err
+	test_grep ! "You have divergent branches" err
 '
 
 test_expect_success 'pull.rebase not set and --rebase given' '
 	git reset --hard c0 &&
 	git pull --rebase . c1 2>err &&
-	test_i18ngrep ! "Pulling without specifying how to reconcile" err
+	test_grep ! "You have divergent branches" err
 '
 
 test_expect_success 'pull.rebase not set and --no-rebase given' '
 	git reset --hard c0 &&
 	git pull --no-rebase . c1 2>err &&
-	test_i18ngrep ! "Pulling without specifying how to reconcile" err
+	test_grep ! "You have divergent branches" err
+'
+
+test_expect_success 'pull.rebase not set and --ff given' '
+	git reset --hard c0 &&
+	git pull --ff . c1 2>err &&
+	test_grep ! "You have divergent branches" err
+'
+
+test_expect_success 'pull.rebase not set and --no-ff given' '
+	git reset --hard c0 &&
+	git pull --no-ff . c1 2>err &&
+	test_grep ! "You have divergent branches" err
 '
 
 test_expect_success 'pull.rebase not set and --ff-only given' '
 	git reset --hard c0 &&
 	git pull --ff-only . c1 2>err &&
-	test_i18ngrep ! "Pulling without specifying how to reconcile" err
+	test_grep ! "You have divergent branches" err
+'
+
+test_expect_success 'pull.rebase not set (not-fast-forward)' '
+	git reset --hard c2 &&
+	test_must_fail git -c color.advice=always pull . c1 2>err &&
+	test_decode_color <err >decoded &&
+	test_grep "<YELLOW>hint: " decoded &&
+	test_grep "You have divergent branches" decoded
+'
+
+test_expect_success 'pull.rebase not set and pull.ff=true (not-fast-forward)' '
+	git reset --hard c2 &&
+	test_config pull.ff true &&
+	git pull . c1 2>err &&
+	test_grep ! "You have divergent branches" err
+'
+
+test_expect_success 'pull.rebase not set and pull.ff=false (not-fast-forward)' '
+	git reset --hard c2 &&
+	test_config pull.ff false &&
+	git pull . c1 2>err &&
+	test_grep ! "You have divergent branches" err
+'
+
+test_expect_success 'pull.rebase not set and pull.ff=only (not-fast-forward)' '
+	git reset --hard c2 &&
+	test_config pull.ff only &&
+	test_must_fail git pull . c1 2>err &&
+	test_grep ! "You have divergent branches" err
+'
+
+test_expect_success 'pull.rebase not set and --rebase given (not-fast-forward)' '
+	git reset --hard c2 &&
+	git pull --rebase . c1 2>err &&
+	test_grep ! "You have divergent branches" err
+'
+
+test_expect_success 'pull.rebase not set and --no-rebase given (not-fast-forward)' '
+	git reset --hard c2 &&
+	git pull --no-rebase . c1 2>err &&
+	test_grep ! "You have divergent branches" err
+'
+
+test_expect_success 'pull.rebase not set and --ff given (not-fast-forward)' '
+	git reset --hard c2 &&
+	git pull --ff . c1 2>err &&
+	test_grep ! "You have divergent branches" err
+'
+
+test_expect_success 'pull.rebase not set and --no-ff given (not-fast-forward)' '
+	git reset --hard c2 &&
+	git pull --no-ff . c1 2>err &&
+	test_grep ! "You have divergent branches" err
+'
+
+test_expect_success 'pull.rebase not set and --ff-only given (not-fast-forward)' '
+	git reset --hard c2 &&
+	test_must_fail git pull --ff-only . c1 2>err &&
+	test_grep ! "You have divergent branches" err
+'
+
+test_does_rebase () {
+	git reset --hard c2 &&
+	git "$@" . c1 &&
+	# Check that we actually did a rebase
+	git rev-list --count HEAD >actual &&
+	git rev-list --merges --count HEAD >>actual &&
+	test_write_lines 3 0 >expect &&
+	test_cmp expect actual &&
+	rm actual expect
+}
+
+# Prefers merge over fast-forward
+test_does_merge_when_ff_possible () {
+	git reset --hard c0 &&
+	git "$@" . c1 &&
+	# Check that we actually did a merge
+	git rev-list --count HEAD >actual &&
+	git rev-list --merges --count HEAD >>actual &&
+	test_write_lines 3 1 >expect &&
+	test_cmp expect actual &&
+	rm actual expect
+}
+
+# Prefers fast-forward over merge or rebase
+test_does_fast_forward () {
+	git reset --hard c0 &&
+	git "$@" . c1 &&
+
+	# Check that we did not get any merges
+	git rev-list --count HEAD >actual &&
+	git rev-list --merges --count HEAD >>actual &&
+	test_write_lines 2 0 >expect &&
+	test_cmp expect actual &&
+
+	# Check that we ended up at c1
+	git rev-parse HEAD >actual &&
+	git rev-parse c1^{commit} >expect &&
+	test_cmp actual expect &&
+
+	# Remove temporary files
+	rm actual expect
+}
+
+# Doesn't fail when fast-forward not possible; does a merge
+test_falls_back_to_full_merge () {
+	git reset --hard c2 &&
+	git "$@" . c1 &&
+	# Check that we actually did a merge
+	git rev-list --count HEAD >actual &&
+	git rev-list --merges --count HEAD >>actual &&
+	test_write_lines 4 1 >expect &&
+	test_cmp expect actual &&
+	rm actual expect
+}
+
+# Attempts fast forward, which is impossible, and bails
+test_attempts_fast_forward () {
+	git reset --hard c2 &&
+	test_must_fail git "$@" . c1 2>err &&
+	test_grep "Not possible to fast-forward, aborting" err
+}
+
+#
+# Group 1: Interaction of --ff-only with --[no-]rebase
+# (And related interaction of pull.ff=only with pull.rebase)
+#
+test_expect_success '--ff-only overrides --rebase' '
+	test_attempts_fast_forward pull --rebase --ff-only
+'
+
+test_expect_success '--ff-only overrides --rebase even if first' '
+	test_attempts_fast_forward pull --ff-only --rebase
+'
+
+test_expect_success '--ff-only overrides --no-rebase' '
+	test_attempts_fast_forward pull --ff-only --no-rebase
+'
+
+test_expect_success 'pull.ff=only overrides pull.rebase=true' '
+	test_attempts_fast_forward -c pull.ff=only -c pull.rebase=true pull
+'
+
+test_expect_success 'pull.ff=only overrides pull.rebase=false' '
+	test_attempts_fast_forward -c pull.ff=only -c pull.rebase=false pull
+'
+
+# Group 2: --rebase=[!false] overrides --no-ff and --ff
+# (And related interaction of pull.rebase=!false and pull.ff=!only)
+test_expect_success '--rebase overrides --no-ff' '
+	test_does_rebase pull --rebase --no-ff
+'
+
+test_expect_success '--rebase overrides --ff' '
+	test_does_rebase pull --rebase --ff
+'
+
+test_expect_success '--rebase fast-forwards when possible' '
+	test_does_fast_forward pull --rebase --ff
+'
+
+test_expect_success 'pull.rebase=true overrides pull.ff=false' '
+	test_does_rebase -c pull.rebase=true -c pull.ff=false pull
+'
+
+test_expect_success 'pull.rebase=true overrides pull.ff=true' '
+	test_does_rebase -c pull.rebase=true -c pull.ff=true pull
+'
+
+# Group 3: command line flags take precedence over config
+test_expect_success '--ff-only takes precedence over pull.rebase=true' '
+	test_attempts_fast_forward -c pull.rebase=true pull --ff-only
+'
+
+test_expect_success '--ff-only takes precedence over pull.rebase=false' '
+	test_attempts_fast_forward -c pull.rebase=false pull --ff-only
+'
+
+test_expect_success '--no-rebase takes precedence over pull.ff=only' '
+	test_falls_back_to_full_merge -c pull.ff=only pull --no-rebase
+'
+
+test_expect_success '--rebase takes precedence over pull.ff=only' '
+	test_does_rebase -c pull.ff=only pull --rebase
+'
+
+test_expect_success '--rebase overrides pull.ff=true' '
+	test_does_rebase -c pull.ff=true pull --rebase
+'
+
+test_expect_success '--rebase overrides pull.ff=false' '
+	test_does_rebase -c pull.ff=false pull --rebase
+'
+
+test_expect_success '--rebase overrides pull.ff unset' '
+	test_does_rebase pull --rebase
+'
+
+# Group 4: --no-rebase heeds pull.ff=!only or explict --ff or --no-ff
+
+test_expect_success '--no-rebase works with --no-ff' '
+	test_does_merge_when_ff_possible pull --no-rebase --no-ff
+'
+
+test_expect_success '--no-rebase works with --ff' '
+	test_does_fast_forward pull --no-rebase --ff
+'
+
+test_expect_success '--no-rebase does ff if pull.ff unset' '
+	test_does_fast_forward pull --no-rebase
+'
+
+test_expect_success '--no-rebase heeds pull.ff=true' '
+	test_does_fast_forward -c pull.ff=true pull --no-rebase
+'
+
+test_expect_success '--no-rebase heeds pull.ff=false' '
+	test_does_merge_when_ff_possible -c pull.ff=false pull --no-rebase
+'
+
+# Group 5: pull.rebase=!false in combination with --no-ff or --ff
+test_expect_success 'pull.rebase=true and --no-ff' '
+	test_does_rebase -c pull.rebase=true pull --no-ff
+'
+
+test_expect_success 'pull.rebase=true and --ff' '
+	test_does_rebase -c pull.rebase=true pull --ff
+'
+
+test_expect_success 'pull.rebase=false and --no-ff' '
+	test_does_merge_when_ff_possible -c pull.rebase=false pull --no-ff
+'
+
+test_expect_success 'pull.rebase=false and --ff, ff possible' '
+	test_does_fast_forward -c pull.rebase=false pull --ff
+'
+
+test_expect_success 'pull.rebase=false and --ff, ff not possible' '
+	test_falls_back_to_full_merge -c pull.rebase=false pull --ff
+'
+
+# End of groupings for conflicting merge vs. rebase flags/options
+
+test_expect_success 'Multiple heads warns about inability to fast forward' '
+	git reset --hard c1 &&
+	test_must_fail git pull . c2 c3 2>err &&
+	test_grep "You have divergent branches" err
+'
+
+test_expect_success 'Multiple can never be fast forwarded' '
+	git reset --hard c0 &&
+	test_must_fail git -c pull.ff=only pull . c1 c2 c3 2>err &&
+	test_grep ! "You have divergent branches" err &&
+	# In addition to calling out "cannot fast-forward", we very much
+	# want the "multiple branches" piece to be called out to users.
+	test_grep "Cannot fast-forward to multiple branches" err
+'
+
+test_expect_success 'Cannot rebase with multiple heads' '
+	git reset --hard c0 &&
+	test_must_fail git -c pull.rebase=true pull . c1 c2 c3 2>err &&
+	test_grep ! "You have divergent branches" err &&
+	test_grep "Cannot rebase onto multiple branches." err
 '
 
 test_expect_success 'merge c1 with c2' '
 	git reset --hard c1 &&
-	test -f c0.c &&
-	test -f c1.c &&
-	test ! -f c2.c &&
-	test ! -f c3.c &&
+	test_path_is_file c0.c &&
+	test_path_is_file c1.c &&
+	test_path_is_missing c2.c &&
+	test_path_is_missing c3.c &&
 	git merge c2 &&
-	test -f c1.c &&
-	test -f c2.c
+	test_path_is_file c1.c &&
+	test_path_is_file c2.c
 '
 
 test_expect_success 'fast-forward pull succeeds with "true" in pull.ff' '
@@ -105,12 +387,32 @@ test_expect_success 'pull prevents non-fast-forward with "only" in pull.ff' '
 	test_must_fail git pull . c3
 '
 
+test_expect_success 'already-up-to-date pull succeeds with unspecified pull.ff' '
+	git reset --hard c1 &&
+	git pull . c0 &&
+	test "$(git rev-parse HEAD)" = "$(git rev-parse c1)"
+'
+
+test_expect_success 'already-up-to-date pull succeeds with "only" in pull.ff' '
+	git reset --hard c1 &&
+	test_config pull.ff only &&
+	git pull . c0 &&
+	test "$(git rev-parse HEAD)" = "$(git rev-parse c1)"
+'
+
+test_expect_success 'already-up-to-date pull/rebase succeeds with "only" in pull.ff' '
+	git reset --hard c1 &&
+	test_config pull.ff only &&
+	git -c pull.rebase=true pull . c0 &&
+	test "$(git rev-parse HEAD)" = "$(git rev-parse c1)"
+'
+
 test_expect_success 'merge c1 with c2 (ours in pull.twohead)' '
 	git reset --hard c1 &&
 	git config pull.twohead ours &&
 	git merge c2 &&
-	test -f c1.c &&
-	! test -f c2.c
+	test_path_is_file c1.c &&
+	test_path_is_missing c2.c
 '
 
 test_expect_success 'merge c1 with c2 and c3 (recursive in pull.octopus)' '
@@ -129,10 +431,10 @@ test_expect_success 'merge c1 with c2 and c3 (recursive and octopus in pull.octo
 	test "$(git rev-parse c2)" = "$(git rev-parse HEAD^2)" &&
 	test "$(git rev-parse c3)" = "$(git rev-parse HEAD^3)" &&
 	git diff --exit-code &&
-	test -f c0.c &&
-	test -f c1.c &&
-	test -f c2.c &&
-	test -f c3.c
+	test_path_is_file c0.c &&
+	test_path_is_file c1.c &&
+	test_path_is_file c2.c &&
+	test_path_is_file c3.c
 '
 
 conflict_count()
diff --git a/t/t7602-merge-octopus-many.sh b/t/t7602-merge-octopus-many.sh
index 6abe441..3669d33 100755
--- a/t/t7602-merge-octopus-many.sh
+++ b/t/t7602-merge-octopus-many.sh
@@ -4,6 +4,7 @@ test_description='git merge
 
 Testing octopus merge with more than 25 refs.'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -29,8 +30,8 @@ test_expect_success 'merge c1 with c2, c3, c4, ... c29' '
 	refs="" &&
 	while test $i -le 30
 	do
-		refs="$refs c$i"
-		i=$(expr $i + 1)
+		refs="$refs c$i" &&
+		i=$(expr $i + 1) || return 1
 	done &&
 	git merge $refs &&
 	test "$(git rev-parse c1)" != "$(git rev-parse HEAD)" &&
@@ -66,7 +67,7 @@ EOF
 test_expect_success 'merge output uses pretty names' '
 	git reset --hard c1 &&
 	git merge c2 c3 c4 >actual &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 cat >expected <<\EOF
@@ -77,8 +78,14 @@ Merge made by the 'recursive' strategy.
 EOF
 
 test_expect_success 'merge reduces irrelevant remote heads' '
+	if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+	then
+		mv expected expected.tmp &&
+		sed s/recursive/ort/ expected.tmp >expected &&
+		rm expected.tmp
+	fi &&
 	GIT_MERGE_VERBOSITY=0 git merge c4 c5 >actual &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 cat >expected <<\EOF
@@ -95,7 +102,7 @@ EOF
 test_expect_success 'merge fast-forward output uses pretty names' '
 	git reset --hard c0 &&
 	git merge c1 c2 >actual &&
-	test_i18ncmp expected actual
+	test_cmp expected actual
 '
 
 test_done
diff --git a/t/t7603-merge-reduce-heads.sh b/t/t7603-merge-reduce-heads.sh
index 9894895..0e85b21 100755
--- a/t/t7603-merge-reduce-heads.sh
+++ b/t/t7603-merge-reduce-heads.sh
@@ -4,6 +4,7 @@ test_description='git merge
 
 Testing octopus merge when reducing parents to independent branches.'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # 0 - 1
@@ -68,7 +69,7 @@ test_expect_success 'merge c1 with c2, c3, c4, c5' '
 
 test_expect_success 'pull c2, c3, c4, c5 into c1' '
 	git reset --hard c1 &&
-	git pull . c2 c3 c4 c5 &&
+	git pull --no-rebase . c2 c3 c4 c5 &&
 	test "$(git rev-parse c1)" != "$(git rev-parse HEAD)" &&
 	test "$(git rev-parse c1)" = "$(git rev-parse HEAD^1)" &&
 	test "$(git rev-parse c2)" = "$(git rev-parse HEAD^2)" &&
@@ -95,7 +96,7 @@ test_expect_success 'setup' '
 		echo $i > $i.c &&
 		git add $i.c &&
 		git commit -m $i &&
-		git tag $i
+		git tag $i || return 1
 	done &&
 	git reset --hard A &&
 	for i in F G H I
@@ -103,7 +104,7 @@ test_expect_success 'setup' '
 		echo $i > $i.c &&
 		git add $i.c &&
 		git commit -m $i &&
-		git tag $i
+		git tag $i || return 1
 	done
 '
 
diff --git a/t/t7604-merge-custom-message.sh b/t/t7604-merge-custom-message.sh
index cd4f960..eca7555 100755
--- a/t/t7604-merge-custom-message.sh
+++ b/t/t7604-merge-custom-message.sh
@@ -4,6 +4,7 @@ test_description='git merge
 
 Testing merge when using a custom message for the merge commit.'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 create_merge_msgs() {
diff --git a/t/t7605-merge-resolve.sh b/t/t7605-merge-resolve.sh
index 5d56c38..62d935d 100755
--- a/t/t7605-merge-resolve.sh
+++ b/t/t7605-merge-resolve.sh
@@ -4,6 +4,7 @@ test_description='git merge
 
 Testing the resolve strategy.'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
diff --git a/t/t7606-merge-custom.sh b/t/t7606-merge-custom.sh
index 8e8c4d7..81fb7c4 100755
--- a/t/t7606-merge-custom.sh
+++ b/t/t7606-merge-custom.sh
@@ -4,7 +4,7 @@ test_description="git merge
 
 Testing a custom strategy.
 
-*   (HEAD, master) Merge commit 'c3'
+*   (HEAD, main) Merge commit 'c3'
 |\
 | * (tag: c3) c3
 * | (tag: c1) c1
diff --git a/t/t7607-merge-state.sh b/t/t7607-merge-state.sh
new file mode 100755
index 0000000..9001674
--- /dev/null
+++ b/t/t7607-merge-state.sh
@@ -0,0 +1,33 @@
+#!/bin/sh
+
+test_description="Test that merge state is as expected after failed merge"
+
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+test_expect_success 'Ensure we restore original state if no merge strategy handles it' '
+	test_commit --no-tag "Initial" base base &&
+
+	for b in branch1 branch2 branch3
+	do
+		git checkout -b $b main &&
+		test_commit --no-tag "Change on $b" base $b || return 1
+	done &&
+
+	git checkout branch1 &&
+	# This is a merge that octopus cannot handle.  Note, that it does not
+	# just hit conflicts, it completely fails and says that it cannot
+	# handle this type of merge.
+	test_expect_code 2 git merge branch2 branch3 >output 2>&1 &&
+	grep "fatal: merge program failed" output &&
+	grep "Should not be doing an octopus" output &&
+
+	# Make sure we did not leave stray changes around when no appropriate
+	# merge strategy was found
+	git diff --exit-code --name-status &&
+	test_path_is_missing .git/MERGE_HEAD
+'
+
+test_done
diff --git a/t/t7608-merge-messages.sh b/t/t7608-merge-messages.sh
index 8e7e0a5..2179938 100755
--- a/t/t7608-merge-messages.sh
+++ b/t/t7608-merge-messages.sh
@@ -1,6 +1,10 @@
 #!/bin/sh
 
 test_description='test auto-generated merge messages'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 check_oneline() {
@@ -10,51 +14,51 @@ check_oneline() {
 }
 
 test_expect_success 'merge local branch' '
-	test_commit master-1 &&
+	test_commit main-1 &&
 	git checkout -b local-branch &&
 	test_commit branch-1 &&
-	git checkout master &&
-	test_commit master-2 &&
+	git checkout main &&
+	test_commit main-2 &&
 	git merge local-branch &&
 	check_oneline "Merge branch Qlocal-branchQ"
 '
 
 test_expect_success 'merge octopus branches' '
-	git checkout -b octopus-a master &&
+	git checkout -b octopus-a main &&
 	test_commit octopus-1 &&
-	git checkout -b octopus-b master &&
+	git checkout -b octopus-b main &&
 	test_commit octopus-2 &&
-	git checkout master &&
+	git checkout main &&
 	git merge octopus-a octopus-b &&
 	check_oneline "Merge branches Qoctopus-aQ and Qoctopus-bQ"
 '
 
 test_expect_success 'merge tag' '
-	git checkout -b tag-branch master &&
+	git checkout -b tag-branch main &&
 	test_commit tag-1 &&
-	git checkout master &&
-	test_commit master-3 &&
+	git checkout main &&
+	test_commit main-3 &&
 	git merge tag-1 &&
 	check_oneline "Merge tag Qtag-1Q"
 '
 
 test_expect_success 'ambiguous tag' '
-	git checkout -b ambiguous master &&
+	git checkout -b ambiguous main &&
 	test_commit ambiguous &&
-	git checkout master &&
-	test_commit master-4 &&
+	git checkout main &&
+	test_commit main-4 &&
 	git merge ambiguous &&
 	check_oneline "Merge tag QambiguousQ"
 '
 
 test_expect_success 'remote-tracking branch' '
-	git checkout -b remote master &&
+	git checkout -b remote main &&
 	test_commit remote-1 &&
-	git update-ref refs/remotes/origin/master remote &&
-	git checkout master &&
-	test_commit master-5 &&
-	git merge origin/master &&
-	check_oneline "Merge remote-tracking branch Qorigin/masterQ"
+	git update-ref refs/remotes/origin/main remote &&
+	git checkout main &&
+	test_commit main-5 &&
+	git merge origin/main &&
+	check_oneline "Merge remote-tracking branch Qorigin/mainQ"
 '
 
 test_done
diff --git a/t/t7609-mergetool--lib.sh b/t/t7609-mergetool--lib.sh
new file mode 100755
index 0000000..8b1c3bd
--- /dev/null
+++ b/t/t7609-mergetool--lib.sh
@@ -0,0 +1,15 @@
+#!/bin/sh
+
+test_description='git mergetool
+
+Testing basic merge tools options'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+test_expect_success 'mergetool --tool=vimdiff creates the expected layout' '
+	. "$GIT_BUILD_DIR"/mergetools/vimdiff &&
+	run_unit_tests
+'
+
+test_done
diff --git a/t/t7610-mergetool.sh b/t/t7610-mergetool.sh
index ad288dd..22b3a85 100755
--- a/t/t7610-mergetool.sh
+++ b/t/t7610-mergetool.sh
@@ -7,22 +7,25 @@ test_description='git mergetool
 
 Testing basic merge tool invocation'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 # All the mergetool test work by checking out a temporary branch based
-# off 'branch1' and then merging in master and checking the results of
+# off 'branch1' and then merging in main and checking the results of
 # running mergetool
 
 test_expect_success 'setup' '
 	test_config rerere.enabled true &&
-	echo master >file1 &&
-	echo master spaced >"spaced name" &&
-	echo master file11 >file11 &&
-	echo master file12 >file12 &&
-	echo master file13 >file13 &&
-	echo master file14 >file14 &&
+	echo main >file1 &&
+	echo main spaced >"spaced name" &&
+	echo main file11 >file11 &&
+	echo main file12 >file12 &&
+	echo main file13 >file13 &&
+	echo main file14 >file14 &&
 	mkdir subdir &&
-	echo master sub >subdir/file3 &&
+	echo main sub >subdir/file3 &&
 	test_create_repo submod &&
 	(
 		cd submod &&
@@ -30,11 +33,11 @@ test_expect_success 'setup' '
 		git add foo &&
 		git commit -m "Add foo"
 	) &&
-	git submodule add git://example.com/submod submod &&
+	git submodule add file:///dev/null submod &&
 	git add file1 "spaced name" file1[1-4] subdir/file3 .gitmodules submod &&
 	git commit -m "add initial versions" &&
 
-	git checkout -b branch1 master &&
+	git checkout -b branch1 main &&
 	git submodule update -N &&
 	echo branch1 change >file1 &&
 	echo branch1 newfile >file2 &&
@@ -71,39 +74,39 @@ test_expect_success 'setup' '
 	test_write_lines one two 3 >c/c/file.txt &&
 	git commit -a -m"move to c" &&
 
-	git checkout -b stash1 master &&
+	git checkout -b stash1 main &&
 	echo stash1 change file11 >file11 &&
 	git add file11 &&
 	git commit -m "stash1 changes" &&
 
-	git checkout -b stash2 master &&
+	git checkout -b stash2 main &&
 	echo stash2 change file11 >file11 &&
 	git add file11 &&
 	git commit -m "stash2 changes" &&
 
-	git checkout master &&
+	git checkout main &&
 	git submodule update -N &&
-	echo master updated >file1 &&
-	echo master new >file2 &&
-	echo master updated spaced >"spaced name" &&
-	echo master both added >both &&
-	echo master updated file12 >file12 &&
-	echo master updated file14 >file14 &&
-	echo master new sub >subdir/file3 &&
+	echo main updated >file1 &&
+	echo main new >file2 &&
+	echo main updated spaced >"spaced name" &&
+	echo main both added >both &&
+	echo main updated file12 >file12 &&
+	echo main updated file14 >file14 &&
+	echo main new sub >subdir/file3 &&
 	(
 		cd submod &&
-		echo master submodule >bar &&
+		echo main submodule >bar &&
 		git add bar &&
-		git commit -m "Add bar on master" &&
-		git checkout -b submod-master
+		git commit -m "Add bar on main" &&
+		git checkout -b submod-main
 	) &&
 	git add file1 "spaced name" file12 file14 file2 subdir/file3 submod &&
 	git add both &&
 	git rm file11 &&
-	git commit -m "master updates" &&
+	git commit -m "main updates" &&
 
 	git clean -fdx &&
-	git checkout -b order-file-start master &&
+	git checkout -b order-file-start main &&
 	echo start >a &&
 	echo start >b &&
 	git add a b &&
@@ -130,7 +133,7 @@ test_expect_success 'custom mergetool' '
 	test_when_finished "git reset --hard" &&
 	git checkout -b test$test_count branch1 &&
 	git submodule update -N &&
-	test_must_fail git merge master &&
+	test_must_fail git merge main &&
 	yes "" | git mergetool both &&
 	yes "" | git mergetool file1 file1 &&
 	yes "" | git mergetool file2 "spaced name" &&
@@ -138,11 +141,11 @@ test_expect_success 'custom mergetool' '
 	yes "d" | git mergetool file11 &&
 	yes "d" | git mergetool file12 &&
 	yes "l" | git mergetool submod &&
-	echo "master updated" >expect &&
+	echo "main updated" >expect &&
 	test_cmp expect file1 &&
-	echo "master new" >expect &&
+	echo "main new" >expect &&
 	test_cmp expect file2 &&
-	echo "master new sub" >expect &&
+	echo "main new sub" >expect &&
 	test_cmp expect subdir/file3 &&
 	echo "branch1 submodule" >expect &&
 	test_cmp expect submod/bar &&
@@ -156,7 +159,7 @@ test_expect_success 'gui mergetool' '
 	test_when_finished "git reset --hard" &&
 	git checkout -b test$test_count branch1 &&
 	git submodule update -N &&
-	test_must_fail git merge master &&
+	test_must_fail git merge main &&
 	yes "" | git mergetool --gui both &&
 	yes "" | git mergetool -g file1 file1 &&
 	yes "" | git mergetool --gui file2 "spaced name" &&
@@ -164,11 +167,11 @@ test_expect_success 'gui mergetool' '
 	yes "d" | git mergetool --gui file11 &&
 	yes "d" | git mergetool --gui file12 &&
 	yes "l" | git mergetool --gui submod &&
-	echo "gui master updated" >expect &&
+	echo "gui main updated" >expect &&
 	test_cmp expect file1 &&
-	echo "gui master new" >expect &&
+	echo "gui main new" >expect &&
 	test_cmp expect file2 &&
-	echo "gui master new sub" >expect &&
+	echo "gui main new sub" >expect &&
 	test_cmp expect subdir/file3 &&
 	echo "branch1 submodule" >expect &&
 	test_cmp expect submod/bar &&
@@ -179,7 +182,7 @@ test_expect_success 'gui mergetool without merge.guitool set falls back to merge
 	test_when_finished "git reset --hard" &&
 	git checkout -b test$test_count branch1 &&
 	git submodule update -N &&
-	test_must_fail git merge master &&
+	test_must_fail git merge main &&
 	yes "" | git mergetool --gui both &&
 	yes "" | git mergetool -g file1 file1 &&
 	yes "" | git mergetool --gui file2 "spaced name" &&
@@ -187,11 +190,11 @@ test_expect_success 'gui mergetool without merge.guitool set falls back to merge
 	yes "d" | git mergetool --gui file11 &&
 	yes "d" | git mergetool --gui file12 &&
 	yes "l" | git mergetool --gui submod &&
-	echo "master updated" >expect &&
+	echo "main updated" >expect &&
 	test_cmp expect file1 &&
-	echo "master new" >expect &&
+	echo "main new" >expect &&
 	test_cmp expect file2 &&
-	echo "master new sub" >expect &&
+	echo "main new sub" >expect &&
 	test_cmp expect subdir/file3 &&
 	echo "branch1 submodule" >expect &&
 	test_cmp expect submod/bar &&
@@ -206,7 +209,7 @@ test_expect_success 'mergetool crlf' '
 	# test_when_finished is LIFO.)
 	test_config core.autocrlf true &&
 	git checkout -b test$test_count branch1 &&
-	test_must_fail git merge master &&
+	test_must_fail git merge main &&
 	yes "" | git mergetool file1 &&
 	yes "" | git mergetool file2 &&
 	yes "" | git mergetool "spaced name" &&
@@ -215,11 +218,11 @@ test_expect_success 'mergetool crlf' '
 	yes "d" | git mergetool file11 &&
 	yes "d" | git mergetool file12 &&
 	yes "r" | git mergetool submod &&
-	test "$(printf x | cat file1 -)" = "$(printf "master updated\r\nx")" &&
-	test "$(printf x | cat file2 -)" = "$(printf "master new\r\nx")" &&
-	test "$(printf x | cat subdir/file3 -)" = "$(printf "master new sub\r\nx")" &&
+	test "$(printf x | cat file1 -)" = "$(printf "main updated\r\nx")" &&
+	test "$(printf x | cat file2 -)" = "$(printf "main new\r\nx")" &&
+	test "$(printf x | cat subdir/file3 -)" = "$(printf "main new sub\r\nx")" &&
 	git submodule update -N &&
-	echo "master submodule" >expect &&
+	echo "main submodule" >expect &&
 	test_cmp expect submod/bar &&
 	git commit -m "branch1 resolved with mergetool - autocrlf"
 '
@@ -230,9 +233,9 @@ test_expect_success 'mergetool in subdir' '
 	git submodule update -N &&
 	(
 		cd subdir &&
-		test_must_fail git merge master &&
+		test_must_fail git merge main &&
 		yes "" | git mergetool file3 &&
-		echo "master new sub" >expect &&
+		echo "main new sub" >expect &&
 		test_cmp expect file3
 	)
 '
@@ -243,7 +246,7 @@ test_expect_success 'mergetool on file in parent dir' '
 	git submodule update -N &&
 	(
 		cd subdir &&
-		test_must_fail git merge master &&
+		test_must_fail git merge main &&
 		yes "" | git mergetool file3 &&
 		yes "" | git mergetool ../file1 &&
 		yes "" | git mergetool ../file2 ../spaced\ name &&
@@ -251,9 +254,9 @@ test_expect_success 'mergetool on file in parent dir' '
 		yes "d" | git mergetool ../file11 &&
 		yes "d" | git mergetool ../file12 &&
 		yes "l" | git mergetool ../submod &&
-		echo "master updated" >expect &&
+		echo "main updated" >expect &&
 		test_cmp expect ../file1 &&
-		echo "master new" >expect &&
+		echo "main new" >expect &&
 		test_cmp expect ../file2 &&
 		echo "branch1 submodule" >expect &&
 		test_cmp expect ../submod/bar &&
@@ -265,7 +268,7 @@ test_expect_success 'mergetool skips autoresolved' '
 	test_when_finished "git reset --hard" &&
 	git checkout -b test$test_count branch1 &&
 	git submodule update -N &&
-	test_must_fail git merge master &&
+	test_must_fail git merge main &&
 	test -n "$(git ls-files -u)" &&
 	yes "d" | git mergetool file11 &&
 	yes "d" | git mergetool file12 &&
@@ -280,17 +283,17 @@ test_expect_success 'mergetool merges all from subdir (rerere disabled)' '
 	test_config rerere.enabled false &&
 	(
 		cd subdir &&
-		test_must_fail git merge master &&
+		test_must_fail git merge main &&
 		yes "r" | git mergetool ../submod &&
 		yes "d" "d" | git mergetool --no-prompt &&
-		echo "master updated" >expect &&
+		echo "main updated" >expect &&
 		test_cmp expect ../file1 &&
-		echo "master new" >expect &&
+		echo "main new" >expect &&
 		test_cmp expect ../file2 &&
-		echo "master new sub" >expect &&
+		echo "main new sub" >expect &&
 		test_cmp expect file3 &&
 		( cd .. && git submodule update -N ) &&
-		echo "master submodule" >expect &&
+		echo "main submodule" >expect &&
 		test_cmp expect ../submod/bar &&
 		git commit -m "branch2 resolved by mergetool from subdir"
 	)
@@ -303,17 +306,17 @@ test_expect_success 'mergetool merges all from subdir (rerere enabled)' '
 	rm -rf .git/rr-cache &&
 	(
 		cd subdir &&
-		test_must_fail git merge master &&
+		test_must_fail git merge main &&
 		yes "r" | git mergetool ../submod &&
 		yes "d" "d" | git mergetool --no-prompt &&
-		echo "master updated" >expect &&
+		echo "main updated" >expect &&
 		test_cmp expect ../file1 &&
-		echo "master new" >expect &&
+		echo "main new" >expect &&
 		test_cmp expect ../file2 &&
-		echo "master new sub" >expect &&
+		echo "main new sub" >expect &&
 		test_cmp expect file3 &&
 		( cd .. && git submodule update -N ) &&
-		echo "master submodule" >expect &&
+		echo "main submodule" >expect &&
 		test_cmp expect ../submod/bar &&
 		git commit -m "branch2 resolved by mergetool from subdir"
 	)
@@ -325,7 +328,7 @@ test_expect_success 'mergetool skips resolved paths when rerere is active' '
 	rm -rf .git/rr-cache &&
 	git checkout -b test$test_count branch1 &&
 	git submodule update -N &&
-	test_must_fail git merge master &&
+	test_must_fail git merge main &&
 	yes "l" | git mergetool --no-prompt submod &&
 	yes "d" "d" | git mergetool --no-prompt &&
 	git submodule update -N &&
@@ -366,11 +369,11 @@ test_expect_success 'mergetool takes partial path' '
 	test_config rerere.enabled false &&
 	git checkout -b test$test_count branch1 &&
 	git submodule update -N &&
-	test_must_fail git merge master &&
+	test_must_fail git merge main &&
 
 	yes "" | git mergetool subdir &&
 
-	echo "master new sub" >expect &&
+	echo "main new sub" >expect &&
 	test_cmp expect subdir/file3
 '
 
@@ -434,7 +437,7 @@ test_expect_success 'deleted vs modified submodule' '
 	git rm --cached submod &&
 	git commit -m "Submodule deleted from branch" &&
 	git checkout -b test$test_count.a test$test_count &&
-	test_must_fail git merge master &&
+	test_must_fail git merge main &&
 	test -n "$(git ls-files -u)" &&
 	yes "" | git mergetool file1 file2 spaced\ name subdir/file3 &&
 	yes "" | git mergetool both &&
@@ -444,7 +447,7 @@ test_expect_success 'deleted vs modified submodule' '
 	echo "branch1 submodule" >expect &&
 	test_cmp expect submod/bar &&
 	git submodule update -N &&
-	echo "master submodule" >expect &&
+	echo "main submodule" >expect &&
 	test_cmp expect submod/bar &&
 	output="$(git mergetool --no-prompt)" &&
 	test "$output" = "No files need merging" &&
@@ -453,7 +456,7 @@ test_expect_success 'deleted vs modified submodule' '
 	mv submod submod-movedaside &&
 	git checkout -b test$test_count.b test$test_count &&
 	git submodule update -N &&
-	test_must_fail git merge master &&
+	test_must_fail git merge main &&
 	test -n "$(git ls-files -u)" &&
 	yes "" | git mergetool file1 file2 spaced\ name subdir/file3 &&
 	yes "" | git mergetool both &&
@@ -465,7 +468,7 @@ test_expect_success 'deleted vs modified submodule' '
 	git commit -m "Merge resolved by deleting module" &&
 
 	mv submod-movedaside submod &&
-	git checkout -b test$test_count.c master &&
+	git checkout -b test$test_count.c main &&
 	git submodule update -N &&
 	test_must_fail git merge test$test_count &&
 	test -n "$(git ls-files -u)" &&
@@ -481,7 +484,7 @@ test_expect_success 'deleted vs modified submodule' '
 	git commit -m "Merge resolved by deleting module" &&
 	mv submod.orig submod &&
 
-	git checkout -b test$test_count.d master &&
+	git checkout -b test$test_count.d main &&
 	git submodule update -N &&
 	test_must_fail git merge test$test_count &&
 	test -n "$(git ls-files -u)" &&
@@ -489,10 +492,10 @@ test_expect_success 'deleted vs modified submodule' '
 	yes "" | git mergetool both &&
 	yes "d" | git mergetool file11 file12 &&
 	yes "l" | git mergetool submod &&
-	echo "master submodule" >expect &&
+	echo "main submodule" >expect &&
 	test_cmp expect submod/bar &&
 	git submodule update -N &&
-	echo "master submodule" >expect &&
+	echo "main submodule" >expect &&
 	test_cmp expect submod/bar &&
 	output="$(git mergetool --no-prompt)" &&
 	test "$output" = "No files need merging" &&
@@ -509,7 +512,7 @@ test_expect_success 'file vs modified submodule' '
 	git add submod &&
 	git commit -m "Submodule path becomes file" &&
 	git checkout -b test$test_count.a branch1 &&
-	test_must_fail git merge master &&
+	test_must_fail git merge main &&
 	test -n "$(git ls-files -u)" &&
 	yes "" | git mergetool file1 file2 spaced\ name subdir/file3 &&
 	yes "" | git mergetool both &&
@@ -519,7 +522,7 @@ test_expect_success 'file vs modified submodule' '
 	echo "branch1 submodule" >expect &&
 	test_cmp expect submod/bar &&
 	git submodule update -N &&
-	echo "master submodule" >expect &&
+	echo "main submodule" >expect &&
 	test_cmp expect submod/bar &&
 	output="$(git mergetool --no-prompt)" &&
 	test "$output" = "No files need merging" &&
@@ -527,12 +530,19 @@ test_expect_success 'file vs modified submodule' '
 
 	mv submod submod-movedaside &&
 	git checkout -b test$test_count.b test$test_count &&
-	test_must_fail git merge master &&
+	test_must_fail git merge main &&
 	test -n "$(git ls-files -u)" &&
 	yes "" | git mergetool file1 file2 spaced\ name subdir/file3 &&
 	yes "" | git mergetool both &&
 	yes "d" | git mergetool file11 file12 &&
-	yes "l" | git mergetool submod &&
+	if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+	then
+		yes "c" | git mergetool submod~HEAD &&
+		git rm submod &&
+		git mv submod~HEAD submod
+	else
+		yes "l" | git mergetool submod
+	fi &&
 	git submodule update -N &&
 	echo "not a submodule" >expect &&
 	test_cmp expect submod &&
@@ -540,7 +550,7 @@ test_expect_success 'file vs modified submodule' '
 	test "$output" = "No files need merging" &&
 	git commit -m "Merge resolved by keeping file" &&
 
-	git checkout -b test$test_count.c master &&
+	git checkout -b test$test_count.c main &&
 	rmdir submod && mv submod-movedaside submod &&
 	test ! -e submod.orig &&
 	git submodule update -N &&
@@ -549,7 +559,15 @@ test_expect_success 'file vs modified submodule' '
 	yes "" | git mergetool file1 file2 spaced\ name subdir/file3 &&
 	yes "" | git mergetool both &&
 	yes "d" | git mergetool file11 file12 &&
-	yes "r" | git mergetool submod &&
+	if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+	then
+		mv submod submod.orig &&
+		git rm --cached submod &&
+		yes "c" | git mergetool submod~test19 &&
+		git mv submod~test19 submod
+	else
+		yes "r" | git mergetool submod
+	fi &&
 	test -d submod.orig &&
 	git submodule update -N &&
 	echo "not a submodule" >expect &&
@@ -558,7 +576,7 @@ test_expect_success 'file vs modified submodule' '
 	test "$output" = "No files need merging" &&
 	git commit -m "Merge resolved by keeping file" &&
 
-	git checkout -b test$test_count.d master &&
+	git checkout -b test$test_count.d main &&
 	rmdir submod && mv submod.orig submod &&
 	git submodule update -N &&
 	test_must_fail git merge test$test_count &&
@@ -567,10 +585,14 @@ test_expect_success 'file vs modified submodule' '
 	yes "" | git mergetool both &&
 	yes "d" | git mergetool file11 file12 &&
 	yes "l" | git mergetool submod &&
-	echo "master submodule" >expect &&
+	if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+	then
+		yes "d" | git mergetool submod~test19
+	fi &&
+	echo "main submodule" >expect &&
 	test_cmp expect submod/bar &&
 	git submodule update -N &&
-	echo "master submodule" >expect &&
+	echo "main submodule" >expect &&
 	test_cmp expect submod/bar &&
 	output="$(git mergetool --no-prompt)" &&
 	test "$output" = "No files need merging" &&
@@ -592,7 +614,7 @@ test_expect_success 'submodule in subdirectory' '
 		)
 	) &&
 	test_when_finished "rm -rf subdir/subdir_module" &&
-	git submodule add git://example.com/subsubmodule subdir/subdir_module &&
+	git submodule add file:///dev/null subdir/subdir_module &&
 	git add subdir/subdir_module &&
 	git commit -m "add submodule in subdirectory" &&
 
@@ -653,7 +675,7 @@ test_expect_success 'directory vs modified submodule' '
 	git add submod/file16 &&
 	git commit -m "Submodule path becomes directory" &&
 
-	test_must_fail git merge master &&
+	test_must_fail git merge main &&
 	test -n "$(git ls-files -u)" &&
 	yes "l" | git mergetool submod &&
 	echo "not a submodule" >expect &&
@@ -661,10 +683,17 @@ test_expect_success 'directory vs modified submodule' '
 	rm -rf submod.orig &&
 
 	git reset --hard &&
-	test_must_fail git merge master &&
+	test_must_fail git merge main &&
 	test -n "$(git ls-files -u)" &&
 	test ! -e submod.orig &&
-	yes "r" | git mergetool submod &&
+	if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+	then
+		yes "r" | git mergetool submod~main &&
+		git mv submod submod.orig &&
+		git mv submod~main submod
+	else
+		yes "r" | git mergetool submod
+	fi &&
 	test -d submod.orig &&
 	echo "not a submodule" >expect &&
 	test_cmp expect submod.orig/file16 &&
@@ -672,18 +701,18 @@ test_expect_success 'directory vs modified submodule' '
 	mv submod-movedaside/.git submod &&
 	( cd submod && git clean -f && git reset --hard ) &&
 	git submodule update -N &&
-	echo "master submodule" >expect &&
+	echo "main submodule" >expect &&
 	test_cmp expect submod/bar &&
 	git reset --hard &&
 	rm -rf submod-movedaside &&
 
-	git checkout -b test$test_count.c master &&
+	git checkout -b test$test_count.c main &&
 	git submodule update -N &&
 	test_must_fail git merge test$test_count &&
 	test -n "$(git ls-files -u)" &&
 	yes "l" | git mergetool submod &&
 	git submodule update -N &&
-	echo "master submodule" >expect &&
+	echo "main submodule" >expect &&
 	test_cmp expect submod/bar &&
 
 	git reset --hard &&
@@ -695,7 +724,7 @@ test_expect_success 'directory vs modified submodule' '
 	echo "not a submodule" >expect &&
 	test_cmp expect submod/file16 &&
 
-	git reset --hard master &&
+	git reset --hard main &&
 	( cd submod && git clean -f && git reset --hard ) &&
 	git submodule update -N
 '
@@ -703,7 +732,7 @@ test_expect_success 'directory vs modified submodule' '
 test_expect_success 'file with no base' '
 	test_when_finished "git reset --hard" &&
 	git checkout -b test$test_count branch1 &&
-	test_must_fail git merge master &&
+	test_must_fail git merge main &&
 	git mergetool --no-prompt --tool mybase -- both &&
 	test_must_be_empty both
 '
@@ -713,9 +742,9 @@ test_expect_success 'custom commands override built-ins' '
 	git checkout -b test$test_count branch1 &&
 	test_config mergetool.defaults.cmd "cat \"\$REMOTE\" >\"\$MERGED\"" &&
 	test_config mergetool.defaults.trustExitCode true &&
-	test_must_fail git merge master &&
+	test_must_fail git merge main &&
 	git mergetool --no-prompt --tool defaults -- both &&
-	echo master both added >expected &&
+	echo main both added >expected &&
 	test_cmp expected both
 '
 
@@ -725,7 +754,7 @@ test_expect_success 'filenames seen by tools start with ./' '
 	test_config mergetool.writeToTemp false &&
 	test_config mergetool.myecho.cmd "echo \"\$LOCAL\"" &&
 	test_config mergetool.myecho.trustExitCode true &&
-	test_must_fail git merge master &&
+	test_must_fail git merge main &&
 	git mergetool --no-prompt --tool myecho -- both >actual &&
 	grep ^\./both_LOCAL_ actual
 '
@@ -742,7 +771,7 @@ test_expect_success MKTEMP 'temporary filenames are used with mergetool.writeToT
 	test_config mergetool.writeToTemp true &&
 	test_config mergetool.myecho.cmd "echo \"\$LOCAL\"" &&
 	test_config mergetool.myecho.trustExitCode true &&
-	test_must_fail git merge master &&
+	test_must_fail git merge main &&
 	git mergetool --no-prompt --tool myecho -- both >actual &&
 	! grep ^\./both_LOCAL_ actual &&
 	grep /both_LOCAL_ actual
@@ -802,4 +831,71 @@ test_expect_success 'mergetool -Oorder-file is honored' '
 	test_cmp expect actual
 '
 
+test_expect_success 'mergetool --tool-help shows recognized tools' '
+	# Check a few known tools are correctly shown
+	git mergetool --tool-help >mergetools &&
+	grep vimdiff mergetools &&
+	grep vimdiff3 mergetools &&
+	grep gvimdiff2 mergetools &&
+	grep araxis mergetools &&
+	grep xxdiff mergetools &&
+	grep meld mergetools
+'
+
+test_expect_success 'mergetool hideResolved' '
+	test_config mergetool.hideResolved true &&
+	test_when_finished "git reset --hard" &&
+	git checkout -b test${test_count}_b main &&
+	test_write_lines >file1 base "" a &&
+	git commit -a -m "base" &&
+	test_write_lines >file1 base "" c &&
+	git commit -a -m "remote update" &&
+	git checkout -b test${test_count}_a HEAD~ &&
+	test_write_lines >file1 local "" b &&
+	git commit -a -m "local update" &&
+	test_must_fail git merge test${test_count}_b &&
+	yes "" | git mergetool file1 &&
+	test_write_lines >expect local "" c &&
+	test_cmp expect file1 &&
+	git commit -m "test resolved with mergetool"
+'
+
+test_expect_success 'mergetool with guiDefault' '
+	test_config merge.guitool myguitool &&
+	test_config mergetool.myguitool.cmd "(printf \"gui \" && cat \"\$REMOTE\") >\"\$MERGED\"" &&
+	test_config mergetool.myguitool.trustExitCode true &&
+	test_when_finished "git reset --hard" &&
+	git checkout -b test$test_count branch1 &&
+	git submodule update -N &&
+	test_must_fail git merge main &&
+
+	test_config mergetool.guiDefault auto &&
+	DISPLAY=SOMETHING && export DISPLAY &&
+	yes "" | git mergetool both &&
+	yes "" | git mergetool file1 file1 &&
+
+	DISPLAY= && export DISPLAY &&
+	yes "" | git mergetool file2 "spaced name" &&
+
+	test_config mergetool.guiDefault true &&
+	yes "" | git mergetool subdir/file3 &&
+
+	yes "d" | git mergetool file11 &&
+	yes "d" | git mergetool file12 &&
+	yes "l" | git mergetool submod &&
+
+	echo "gui main updated" >expect &&
+	test_cmp expect file1 &&
+
+	echo "main new" >expect &&
+	test_cmp expect file2 &&
+
+	echo "gui main new sub" >expect &&
+	test_cmp expect subdir/file3 &&
+
+	echo "branch1 submodule" >expect &&
+	test_cmp expect submod/bar &&
+	git commit -m "branch1 resolved with mergetool"
+'
+
 test_done
diff --git a/t/t7611-merge-abort.sh b/t/t7611-merge-abort.sh
index 7c84a51..d6975ca 100755
--- a/t/t7611-merge-abort.sh
+++ b/t/t7611-merge-abort.sh
@@ -7,7 +7,7 @@ Set up repo with conflicting and non-conflicting branches:
 There are three files foo/bar/baz, and the following graph illustrates the
 content of these files in each commit:
 
-# foo/bar/baz --- foo/bar/bazz     <-- master
+# foo/bar/baz --- foo/bar/bazz     <-- main
 #             \
 #              --- foo/barf/bazf   <-- conflict_branch
 #               \
@@ -22,6 +22,9 @@ Next, test git merge --abort with the following variables:
 - changed/unchanged worktree after merge
 - changed/unchanged index after merge
 '
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -40,14 +43,14 @@ test_expect_success 'setup' '
 	git checkout -b clean_branch HEAD^ &&
 	echo bart > bar &&
 	git commit -a -m "clean" &&
-	git checkout master
+	git checkout main
 '
 
 pre_merge_head="$(git rev-parse HEAD)"
 
 test_expect_success 'fails without MERGE_HEAD (unstarted merge)' '
 	test_must_fail git merge --abort 2>output &&
-	test_i18ngrep MERGE_HEAD output
+	test_grep MERGE_HEAD output
 '
 
 test_expect_success 'fails without MERGE_HEAD (unstarted merge): .git/MERGE_HEAD sanity' '
@@ -61,7 +64,7 @@ test_expect_success 'fails without MERGE_HEAD (completed merge)' '
 	# Merge successfully completed
 	post_merge_head="$(git rev-parse HEAD)" &&
 	test_must_fail git merge --abort 2>output &&
-	test_i18ngrep MERGE_HEAD output
+	test_grep MERGE_HEAD output
 '
 
 test_expect_success 'fails without MERGE_HEAD (completed merge): .git/MERGE_HEAD sanity' '
diff --git a/t/t7612-merge-verify-signatures.sh b/t/t7612-merge-verify-signatures.sh
index a426f3a..84ddb56 100755
--- a/t/t7612-merge-verify-signatures.sh
+++ b/t/t7612-merge-verify-signatures.sh
@@ -1,6 +1,10 @@
 #!/bin/sh
 
 test_description='merge signature verification tests'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY/lib-gpg.sh"
 
@@ -31,60 +35,60 @@ test_expect_success GPG 'create signed commits' '
 	echo 3 >baz && git add baz &&
 	test_tick && git commit -SB7227189 -m "untrusted on side" &&
 
-	git checkout master
+	git checkout main
 '
 
 test_expect_success GPG 'merge unsigned commit with verification' '
 	test_when_finished "git reset --hard && git checkout initial" &&
 	test_must_fail git merge --ff-only --verify-signatures side-unsigned 2>mergeerror &&
-	test_i18ngrep "does not have a GPG signature" mergeerror
+	test_grep "does not have a GPG signature" mergeerror
 '
 
 test_expect_success GPG 'merge unsigned commit with merge.verifySignatures=true' '
 	test_when_finished "git reset --hard && git checkout initial" &&
 	test_config merge.verifySignatures true &&
 	test_must_fail git merge --ff-only side-unsigned 2>mergeerror &&
-	test_i18ngrep "does not have a GPG signature" mergeerror
+	test_grep "does not have a GPG signature" mergeerror
 '
 
 test_expect_success GPG 'merge commit with bad signature with verification' '
 	test_when_finished "git reset --hard && git checkout initial" &&
 	test_must_fail git merge --ff-only --verify-signatures $(cat forged.commit) 2>mergeerror &&
-	test_i18ngrep "has a bad GPG signature" mergeerror
+	test_grep "has a bad GPG signature" mergeerror
 '
 
 test_expect_success GPG 'merge commit with bad signature with merge.verifySignatures=true' '
 	test_when_finished "git reset --hard && git checkout initial" &&
 	test_config merge.verifySignatures true &&
 	test_must_fail git merge --ff-only $(cat forged.commit) 2>mergeerror &&
-	test_i18ngrep "has a bad GPG signature" mergeerror
+	test_grep "has a bad GPG signature" mergeerror
 '
 
 test_expect_success GPG 'merge commit with untrusted signature with verification' '
 	test_when_finished "git reset --hard && git checkout initial" &&
 	test_must_fail git merge --ff-only --verify-signatures side-untrusted 2>mergeerror &&
-	test_i18ngrep "has an untrusted GPG signature" mergeerror
+	test_grep "has an untrusted GPG signature" mergeerror
 '
 
 test_expect_success GPG 'merge commit with untrusted signature with verification and high minTrustLevel' '
 	test_when_finished "git reset --hard && git checkout initial" &&
 	test_config gpg.minTrustLevel marginal &&
 	test_must_fail git merge --ff-only --verify-signatures side-untrusted 2>mergeerror &&
-	test_i18ngrep "has an untrusted GPG signature" mergeerror
+	test_grep "has an untrusted GPG signature" mergeerror
 '
 
 test_expect_success GPG 'merge commit with untrusted signature with verification and low minTrustLevel' '
 	test_when_finished "git reset --hard && git checkout initial" &&
 	test_config gpg.minTrustLevel undefined &&
 	git merge --ff-only --verify-signatures side-untrusted >mergeoutput &&
-	test_i18ngrep "has a good GPG signature" mergeoutput
+	test_grep "has a good GPG signature" mergeoutput
 '
 
 test_expect_success GPG 'merge commit with untrusted signature with merge.verifySignatures=true' '
 	test_when_finished "git reset --hard && git checkout initial" &&
 	test_config merge.verifySignatures true &&
 	test_must_fail git merge --ff-only side-untrusted 2>mergeerror &&
-	test_i18ngrep "has an untrusted GPG signature" mergeerror
+	test_grep "has an untrusted GPG signature" mergeerror
 '
 
 test_expect_success GPG 'merge commit with untrusted signature with merge.verifySignatures=true and minTrustLevel' '
@@ -92,20 +96,20 @@ test_expect_success GPG 'merge commit with untrusted signature with merge.verify
 	test_config merge.verifySignatures true &&
 	test_config gpg.minTrustLevel marginal &&
 	test_must_fail git merge --ff-only side-untrusted 2>mergeerror &&
-	test_i18ngrep "has an untrusted GPG signature" mergeerror
+	test_grep "has an untrusted GPG signature" mergeerror
 '
 
 test_expect_success GPG 'merge signed commit with verification' '
 	test_when_finished "git reset --hard && git checkout initial" &&
 	git merge --verbose --ff-only --verify-signatures side-signed >mergeoutput &&
-	test_i18ngrep "has a good GPG signature" mergeoutput
+	test_grep "has a good GPG signature" mergeoutput
 '
 
 test_expect_success GPG 'merge signed commit with merge.verifySignatures=true' '
 	test_when_finished "git reset --hard && git checkout initial" &&
 	test_config merge.verifySignatures true &&
 	git merge --verbose --ff-only side-signed >mergeoutput &&
-	test_i18ngrep "has a good GPG signature" mergeoutput
+	test_grep "has a good GPG signature" mergeoutput
 '
 
 test_expect_success GPG 'merge commit with bad signature without verification' '
@@ -129,7 +133,7 @@ test_expect_success GPG 'merge unsigned commit into unborn branch' '
 	test_when_finished "git checkout initial" &&
 	git checkout --orphan unborn &&
 	test_must_fail git merge --verify-signatures side-unsigned 2>mergeerror &&
-	test_i18ngrep "does not have a GPG signature" mergeerror
+	test_grep "does not have a GPG signature" mergeerror
 '
 
 test_done
diff --git a/t/t7614-merge-signoff.sh b/t/t7614-merge-signoff.sh
index c1b8446..cf96a35 100755
--- a/t/t7614-merge-signoff.sh
+++ b/t/t7614-merge-signoff.sh
@@ -5,23 +5,27 @@ test_description='git merge --signoff
 This test runs git merge --signoff and makes sure that it works.
 '
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # Setup test files
 test_setup() {
 	# Expected commit message after merge --signoff
 	cat >expected-signed <<EOF &&
-Merge branch 'master' into other-branch
+Merge branch 'main' into other-branch
 
 Signed-off-by: $(git var GIT_COMMITTER_IDENT | sed -e "s/>.*/>/")
 EOF
 
 	# Expected commit message after merge without --signoff (or with --no-signoff)
 	cat >expected-unsigned <<EOF &&
-Merge branch 'master' into other-branch
+Merge branch 'main' into other-branch
 EOF
 
-	# Initial commit and feature branch to merge master into it.
+	# Initial commit and feature branch to merge main into it.
 	git commit --allow-empty -m "Initial empty commit" &&
 	git checkout -b other-branch &&
 	test_commit other-branch file1 1
@@ -38,30 +42,30 @@ test_expect_success 'setup' '
 
 # Test with --signoff flag
 test_expect_success 'git merge --signoff adds a sign-off line' '
-	git checkout master &&
-	test_commit master-branch-2 file2 2 &&
+	git checkout main &&
+	test_commit main-branch-2 file2 2 &&
 	git checkout other-branch &&
-	git merge master --signoff --no-edit &&
+	git merge main --signoff --no-edit &&
 	git cat-file commit HEAD | sed -e "1,/^\$/d" >actual &&
 	test_cmp expected-signed actual
 '
 
 # Test without --signoff flag
 test_expect_success 'git merge does not add a sign-off line' '
-	git checkout master &&
-	test_commit master-branch-3 file3 3 &&
+	git checkout main &&
+	test_commit main-branch-3 file3 3 &&
 	git checkout other-branch &&
-	git merge master --no-edit &&
+	git merge main --no-edit &&
 	git cat-file commit HEAD | sed -e "1,/^\$/d" >actual &&
 	test_cmp expected-unsigned actual
 '
 
 # Test for --no-signoff flag
 test_expect_success 'git merge --no-signoff flag cancels --signoff flag' '
-	git checkout master &&
-	test_commit master-branch-4 file4 4 &&
+	git checkout main &&
+	test_commit main-branch-4 file4 4 &&
 	git checkout other-branch &&
-	git merge master --no-edit --signoff --no-signoff &&
+	git merge main --no-edit --signoff --no-signoff &&
 	git cat-file commit HEAD | sed -e "1,/^\$/d" >actual &&
 	test_cmp expected-unsigned actual
 '
diff --git a/t/t7700-repack.sh b/t/t7700-repack.sh
index 25b235c..127efe9 100755
--- a/t/t7700-repack.sh
+++ b/t/t7700-repack.sh
@@ -3,10 +3,17 @@
 test_description='git repack works correctly'
 
 . ./test-lib.sh
+. "${TEST_DIRECTORY}/lib-bitmap.sh"
+. "${TEST_DIRECTORY}/lib-midx.sh"
+. "${TEST_DIRECTORY}/lib-terminal.sh"
 
 commit_and_pack () {
 	test_commit "$@" 1>&2 &&
 	incrpackid=$(git pack-objects --all --unpacked --incremental .git/objects/pack/pack </dev/null) &&
+	# Remove any loose object(s) created by test_commit, since they have
+	# already been packed. Leaving these around can create subtly different
+	# packs with `pack-objects`'s `--unpacked` option.
+	git prune-packed 1>&2 &&
 	echo pack-${incrpackid}.pack
 }
 
@@ -63,13 +70,14 @@ test_expect_success 'objects in packs marked .keep are not repacked' '
 
 test_expect_success 'writing bitmaps via command-line can duplicate .keep objects' '
 	# build on $oid, $packid, and .keep state from previous
-	git repack -Adbl &&
+	GIT_TEST_MULTI_PACK_INDEX_WRITE_BITMAP=0 git repack -Adbl &&
 	test_has_duplicate_object true
 '
 
 test_expect_success 'writing bitmaps via config can duplicate .keep objects' '
 	# build on $oid, $packid, and .keep state from previous
-	git -c repack.writebitmaps=true repack -Adl &&
+	GIT_TEST_MULTI_PACK_INDEX_WRITE_BITMAP=0 \
+		git -c repack.writebitmaps=true repack -Adl &&
 	test_has_duplicate_object true
 '
 
@@ -86,6 +94,39 @@ test_expect_success 'loose objects in alternate ODB are not repacked' '
 	test_has_duplicate_object false
 '
 
+test_expect_success SYMLINKS '--local keeps packs when alternate is objectdir ' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	test_commit -C repo A &&
+	(
+		cd repo &&
+		git repack -a &&
+		ls .git/objects/pack/*.pack >../expect &&
+		ln -s objects .git/alt_objects &&
+		echo "$(pwd)/.git/alt_objects" >.git/objects/info/alternates &&
+		git repack -a -d -l &&
+		ls .git/objects/pack/*.pack >../actual
+	) &&
+	test_cmp expect actual
+'
+
+test_expect_success '--local disables writing bitmaps when connected to alternate ODB' '
+	test_when_finished "rm -rf shared member" &&
+
+	git init shared &&
+	git clone --shared shared member &&
+	(
+		cd member &&
+		test_commit "object" &&
+		GIT_TEST_MULTI_PACK_INDEX=0 git repack -Adl --write-bitmap-index 2>err &&
+		cat >expect <<-EOF &&
+		warning: disabling bitmap writing, as some objects are not being packed
+		EOF
+		test_cmp expect err &&
+		test_path_is_missing .git/objects/pack-*.bitmap
+	)
+'
+
 test_expect_success 'packed obs in alt ODB are repacked even when local repo is packless' '
 	mkdir alt_objects/pack &&
 	mv .git/objects/pack/* alt_objects/pack &&
@@ -114,7 +155,7 @@ test_expect_success 'packed obs in alternate ODB kept pack are repacked' '
 			rm alt_objects/pack/$base_name.keep
 		else
 			touch alt_objects/pack/$base_name.keep
-		fi
+		fi || return 1
 	done &&
 	git repack -a -d &&
 	test_no_missing_in_packs
@@ -172,6 +213,8 @@ test_expect_success 'repack --keep-pack' '
 	test_create_repo keep-pack &&
 	(
 		cd keep-pack &&
+		# avoid producing different packs due to delta/base choices
+		git config pack.window 0 &&
 		P1=$(commit_and_pack 1) &&
 		P2=$(commit_and_pack 2) &&
 		P3=$(commit_and_pack 3) &&
@@ -183,13 +226,66 @@ test_expect_success 'repack --keep-pack' '
 		grep -q $P1 new-counts &&
 		grep -q $P4 new-counts &&
 		test_line_count = 3 new-counts &&
+		git fsck &&
+
+		P5=$(commit_and_pack --no-tag 5) &&
+		git reset --hard HEAD^ &&
+		git reflog expire --all --expire=all &&
+		rm -f ".git/objects/pack/${P5%.pack}.idx" &&
+		rm -f ".git/objects/info/commit-graph" &&
+		for from in $(find .git/objects/pack -type f -name "${P5%.pack}.*")
+		do
+			to="$(dirname "$from")/.tmp-1234-$(basename "$from")" &&
+			mv "$from" "$to" || return 1
+		done &&
+
+		# A .idx file without a .pack should not stop us from
+		# repacking what we can.
+		touch .git/objects/pack/pack-does-not-exist.idx &&
+
+		git repack --cruft -d --keep-pack $P1 --keep-pack $P4 &&
+
+		ls .git/objects/pack/*.pack >newer-counts &&
+		test_cmp new-counts newer-counts &&
 		git fsck
 	)
 '
 
+test_expect_success 'repacking fails when missing .pack actually means missing objects' '
+	test_create_repo idx-without-pack &&
+	(
+		cd idx-without-pack &&
+
+		# Avoid producing different packs due to delta/base choices
+		git config pack.window 0 &&
+		P1=$(commit_and_pack 1) &&
+		P2=$(commit_and_pack 2) &&
+		P3=$(commit_and_pack 3) &&
+		P4=$(commit_and_pack 4) &&
+		ls .git/objects/pack/*.pack >old-counts &&
+		test_line_count = 4 old-counts &&
+
+		# Remove one .pack file
+		rm .git/objects/pack/$P2 &&
+
+		ls .git/objects/pack/*.pack >before-pack-dir &&
+
+		test_must_fail git fsck &&
+		test_must_fail env GIT_COMMIT_GRAPH_PARANOIA=true git repack --cruft -d 2>err &&
+		grep "bad object" err &&
+
+		# Before failing, the repack did not modify the
+		# pack directory.
+		ls .git/objects/pack/*.pack >after-pack-dir &&
+		test_cmp before-pack-dir after-pack-dir
+	)
+'
+
 test_expect_success 'bitmaps are created by default in bare repos' '
 	git clone --bare .git bare.git &&
-	git -C bare.git repack -ad &&
+	rm -f bare.git/objects/pack/*.bitmap &&
+	GIT_TEST_MULTI_PACK_INDEX_WRITE_BITMAP=0 \
+		git -C bare.git repack -ad &&
 	bitmap=$(ls bare.git/objects/pack/*.bitmap) &&
 	test_path_is_file "$bitmap"
 '
@@ -200,7 +296,8 @@ test_expect_success 'incremental repack does not complain' '
 '
 
 test_expect_success 'bitmaps can be disabled on bare repos' '
-	git -c repack.writeBitmaps=false -C bare.git repack -ad &&
+	GIT_TEST_MULTI_PACK_INDEX_WRITE_BITMAP=0 \
+		git -c repack.writeBitmaps=false -C bare.git repack -ad &&
 	bitmap=$(ls bare.git/objects/pack/*.bitmap || :) &&
 	test -z "$bitmap"
 '
@@ -211,7 +308,8 @@ test_expect_success 'no bitmaps created if .keep files present' '
 	keep=${pack%.pack}.keep &&
 	test_when_finished "rm -f \"\$keep\"" &&
 	>"$keep" &&
-	git -C bare.git repack -ad 2>stderr &&
+	GIT_TEST_MULTI_PACK_INDEX_WRITE_BITMAP=0 \
+		git -C bare.git repack -ad 2>stderr &&
 	test_must_be_empty stderr &&
 	find bare.git/objects/pack/ -type f -name "*.bitmap" >actual &&
 	test_must_be_empty actual
@@ -222,10 +320,516 @@ test_expect_success 'auto-bitmaps do not complain if unavailable' '
 	blob=$(test-tool genrandom big $((1024*1024)) |
 	       git -C bare.git hash-object -w --stdin) &&
 	git -C bare.git update-ref refs/tags/big $blob &&
-	git -C bare.git repack -ad 2>stderr &&
+	GIT_TEST_MULTI_PACK_INDEX_WRITE_BITMAP=0 \
+		git -C bare.git repack -ad 2>stderr &&
 	test_must_be_empty stderr &&
 	find bare.git/objects/pack -type f -name "*.bitmap" >actual &&
 	test_must_be_empty actual
 '
 
+test_expect_success 'repacking with a filter works' '
+	git -C bare.git repack -a -d &&
+	test_stdout_line_count = 1 ls bare.git/objects/pack/*.pack &&
+	git -C bare.git -c repack.writebitmaps=false repack -a -d --filter=blob:none &&
+	test_stdout_line_count = 2 ls bare.git/objects/pack/*.pack &&
+	commit_pack=$(test-tool -C bare.git find-pack -c 1 HEAD) &&
+	blob_pack=$(test-tool -C bare.git find-pack -c 1 HEAD:file1) &&
+	test "$commit_pack" != "$blob_pack" &&
+	tree_pack=$(test-tool -C bare.git find-pack -c 1 HEAD^{tree}) &&
+	test "$tree_pack" = "$commit_pack" &&
+	blob_pack2=$(test-tool -C bare.git find-pack -c 1 HEAD:file2) &&
+	test "$blob_pack2" = "$blob_pack"
+'
+
+test_expect_success '--filter fails with --write-bitmap-index' '
+	test_must_fail \
+		env GIT_TEST_MULTI_PACK_INDEX_WRITE_BITMAP=0 \
+		git -C bare.git repack -a -d --write-bitmap-index --filter=blob:none
+'
+
+test_expect_success 'repacking with two filters works' '
+	git init two-filters &&
+	(
+		cd two-filters &&
+		mkdir subdir &&
+		test_commit foo &&
+		test_commit subdir_bar subdir/bar &&
+		test_commit subdir_baz subdir/baz
+	) &&
+	git clone --no-local --bare two-filters two-filters.git &&
+	(
+		cd two-filters.git &&
+		test_stdout_line_count = 1 ls objects/pack/*.pack &&
+		git -c repack.writebitmaps=false repack -a -d \
+			--filter=blob:none --filter=tree:1 &&
+		test_stdout_line_count = 2 ls objects/pack/*.pack &&
+		commit_pack=$(test-tool find-pack -c 1 HEAD) &&
+		blob_pack=$(test-tool find-pack -c 1 HEAD:foo.t) &&
+		root_tree_pack=$(test-tool find-pack -c 1 HEAD^{tree}) &&
+		subdir_tree_hash=$(git ls-tree --object-only HEAD -- subdir) &&
+		subdir_tree_pack=$(test-tool find-pack -c 1 "$subdir_tree_hash") &&
+
+		# Root tree and subdir tree are not in the same packfiles
+		test "$commit_pack" != "$blob_pack" &&
+		test "$commit_pack" = "$root_tree_pack" &&
+		test "$blob_pack" = "$subdir_tree_pack"
+	)
+'
+
+prepare_for_keep_packs () {
+	git init keep-packs &&
+	(
+		cd keep-packs &&
+		test_commit foo &&
+		test_commit bar
+	) &&
+	git clone --no-local --bare keep-packs keep-packs.git &&
+	(
+		cd keep-packs.git &&
+
+		# Create two packs
+		# The first pack will contain all of the objects except one blob
+		git rev-list --objects --all >objs &&
+		grep -v "bar.t" objs | git pack-objects pack &&
+		# The second pack will contain the excluded object and be kept
+		packid=$(grep "bar.t" objs | git pack-objects pack) &&
+		>pack-$packid.keep &&
+
+		# Replace the existing pack with the 2 new ones
+		rm -f objects/pack/pack* &&
+		mv pack-* objects/pack/
+	)
+}
+
+test_expect_success '--filter works with .keep packs' '
+	prepare_for_keep_packs &&
+	(
+		cd keep-packs.git &&
+
+		foo_pack=$(test-tool find-pack -c 1 HEAD:foo.t) &&
+		bar_pack=$(test-tool find-pack -c 1 HEAD:bar.t) &&
+		head_pack=$(test-tool find-pack -c 1 HEAD) &&
+
+		test "$foo_pack" != "$bar_pack" &&
+		test "$foo_pack" = "$head_pack" &&
+
+		git -c repack.writebitmaps=false repack -a -d --filter=blob:none &&
+
+		foo_pack_1=$(test-tool find-pack -c 1 HEAD:foo.t) &&
+		bar_pack_1=$(test-tool find-pack -c 1 HEAD:bar.t) &&
+		head_pack_1=$(test-tool find-pack -c 1 HEAD) &&
+
+		# Object bar is still only in the old .keep pack
+		test "$foo_pack_1" != "$foo_pack" &&
+		test "$bar_pack_1" = "$bar_pack" &&
+		test "$head_pack_1" != "$head_pack" &&
+
+		test "$foo_pack_1" != "$bar_pack_1" &&
+		test "$foo_pack_1" != "$head_pack_1" &&
+		test "$bar_pack_1" != "$head_pack_1"
+	)
+'
+
+test_expect_success '--filter works with --pack-kept-objects and .keep packs' '
+	rm -rf keep-packs keep-packs.git &&
+	prepare_for_keep_packs &&
+	(
+		cd keep-packs.git &&
+
+		foo_pack=$(test-tool find-pack -c 1 HEAD:foo.t) &&
+		bar_pack=$(test-tool find-pack -c 1 HEAD:bar.t) &&
+		head_pack=$(test-tool find-pack -c 1 HEAD) &&
+
+		test "$foo_pack" != "$bar_pack" &&
+		test "$foo_pack" = "$head_pack" &&
+
+		git -c repack.writebitmaps=false repack -a -d --filter=blob:none \
+			--pack-kept-objects &&
+
+		foo_pack_1=$(test-tool find-pack -c 1 HEAD:foo.t) &&
+		test-tool find-pack -c 2 HEAD:bar.t >bar_pack_1 &&
+		head_pack_1=$(test-tool find-pack -c 1 HEAD) &&
+
+		test "$foo_pack_1" != "$foo_pack" &&
+		test "$foo_pack_1" != "$bar_pack" &&
+		test "$head_pack_1" != "$head_pack" &&
+
+		# Object bar is in both the old .keep pack and the new
+		# pack that contained the filtered out objects
+		grep "$bar_pack" bar_pack_1 &&
+		grep "$foo_pack_1" bar_pack_1 &&
+		test "$foo_pack_1" != "$head_pack_1"
+	)
+'
+
+test_expect_success '--filter-to stores filtered out objects' '
+	git -C bare.git repack -a -d &&
+	test_stdout_line_count = 1 ls bare.git/objects/pack/*.pack &&
+
+	git init --bare filtered.git &&
+	git -C bare.git -c repack.writebitmaps=false repack -a -d \
+		--filter=blob:none \
+		--filter-to=../filtered.git/objects/pack/pack &&
+	test_stdout_line_count = 1 ls bare.git/objects/pack/pack-*.pack &&
+	test_stdout_line_count = 1 ls filtered.git/objects/pack/pack-*.pack &&
+
+	commit_pack=$(test-tool -C bare.git find-pack -c 1 HEAD) &&
+	blob_pack=$(test-tool -C bare.git find-pack -c 0 HEAD:file1) &&
+	blob_hash=$(git -C bare.git rev-parse HEAD:file1) &&
+	test -n "$blob_hash" &&
+	blob_pack=$(test-tool -C filtered.git find-pack -c 1 $blob_hash) &&
+
+	echo $(pwd)/filtered.git/objects >bare.git/objects/info/alternates &&
+	blob_pack=$(test-tool -C bare.git find-pack -c 1 HEAD:file1) &&
+	blob_content=$(git -C bare.git show $blob_hash) &&
+	test "$blob_content" = "content1"
+'
+
+test_expect_success '--filter works with --max-pack-size' '
+	rm -rf filtered.git &&
+	git init --bare filtered.git &&
+	git init max-pack-size &&
+	(
+		cd max-pack-size &&
+		test_commit base &&
+		# two blobs which exceed the maximum pack size
+		test-tool genrandom foo 1048576 >foo &&
+		git hash-object -w foo &&
+		test-tool genrandom bar 1048576 >bar &&
+		git hash-object -w bar &&
+		git add foo bar &&
+		git commit -m "adding foo and bar"
+	) &&
+	git clone --no-local --bare max-pack-size max-pack-size.git &&
+	(
+		cd max-pack-size.git &&
+		git -c repack.writebitmaps=false repack -a -d --filter=blob:none \
+			--max-pack-size=1M \
+			--filter-to=../filtered.git/objects/pack/pack &&
+		echo $(cd .. && pwd)/filtered.git/objects >objects/info/alternates &&
+
+		# Check that the 3 blobs are in different packfiles in filtered.git
+		test_stdout_line_count = 3 ls ../filtered.git/objects/pack/pack-*.pack &&
+		test_stdout_line_count = 1 ls objects/pack/pack-*.pack &&
+		foo_pack=$(test-tool find-pack -c 1 HEAD:foo) &&
+		bar_pack=$(test-tool find-pack -c 1 HEAD:bar) &&
+		base_pack=$(test-tool find-pack -c 1 HEAD:base.t) &&
+		test "$foo_pack" != "$bar_pack" &&
+		test "$foo_pack" != "$base_pack" &&
+		test "$bar_pack" != "$base_pack" &&
+		for pack in "$foo_pack" "$bar_pack" "$base_pack"
+		do
+			case "$foo_pack" in */filtered.git/objects/pack/*) true ;; *) return 1 ;; esac
+		done
+	)
+'
+
+objdir=.git/objects
+midx=$objdir/pack/multi-pack-index
+
+test_expect_success 'setup for --write-midx tests' '
+	git init midx &&
+	(
+		cd midx &&
+		git config core.multiPackIndex true &&
+
+		test_commit base
+	)
+'
+
+test_expect_success '--write-midx unchanged' '
+	(
+		cd midx &&
+		GIT_TEST_MULTI_PACK_INDEX=0 git repack &&
+		test_path_is_missing $midx &&
+		test_path_is_missing $midx-*.bitmap &&
+
+		GIT_TEST_MULTI_PACK_INDEX=0 git repack --write-midx &&
+
+		test_path_is_file $midx &&
+		test_path_is_missing $midx-*.bitmap &&
+		test_midx_consistent $objdir
+	)
+'
+
+test_expect_success '--write-midx with a new pack' '
+	(
+		cd midx &&
+		test_commit loose &&
+
+		GIT_TEST_MULTI_PACK_INDEX=0 git repack --write-midx &&
+
+		test_path_is_file $midx &&
+		test_path_is_missing $midx-*.bitmap &&
+		test_midx_consistent $objdir
+	)
+'
+
+test_expect_success '--write-midx with -b' '
+	(
+		cd midx &&
+		GIT_TEST_MULTI_PACK_INDEX=0 git repack -mb &&
+
+		test_path_is_file $midx &&
+		test_path_is_file $midx-*.bitmap &&
+		test_midx_consistent $objdir
+	)
+'
+
+test_expect_success '--write-midx with -d' '
+	(
+		cd midx &&
+		test_commit repack &&
+
+		GIT_TEST_MULTI_PACK_INDEX=0 git repack -Ad --write-midx &&
+
+		test_path_is_file $midx &&
+		test_path_is_missing $midx-*.bitmap &&
+		test_midx_consistent $objdir
+	)
+'
+
+test_expect_success 'cleans up MIDX when appropriate' '
+	(
+		cd midx &&
+
+		test_commit repack-2 &&
+		GIT_TEST_MULTI_PACK_INDEX=0 git repack -Adb --write-midx &&
+
+		checksum=$(midx_checksum $objdir) &&
+		test_path_is_file $midx &&
+		test_path_is_file $midx-$checksum.bitmap &&
+
+		test_commit repack-3 &&
+		GIT_TEST_MULTI_PACK_INDEX=0 git repack -Adb --write-midx &&
+
+		test_path_is_file $midx &&
+		test_path_is_missing $midx-$checksum.bitmap &&
+		test_path_is_file $midx-$(midx_checksum $objdir).bitmap &&
+
+		test_commit repack-4 &&
+		GIT_TEST_MULTI_PACK_INDEX=0 git repack -Adb &&
+
+		find $objdir/pack -type f -name "multi-pack-index*" >files &&
+		test_must_be_empty files
+	)
+'
+
+test_expect_success '--write-midx with preferred bitmap tips' '
+	git init midx-preferred-tips &&
+	test_when_finished "rm -fr midx-preferred-tips" &&
+	(
+		cd midx-preferred-tips &&
+
+		test_commit_bulk --message="%s" 103 &&
+
+		git log --format="%H" >commits.raw &&
+		sort <commits.raw >commits &&
+
+		git log --format="create refs/tags/%s/%s %H" HEAD >refs &&
+		git update-ref --stdin <refs &&
+
+		GIT_TEST_MULTI_PACK_INDEX=0 \
+		git repack --write-midx --write-bitmap-index &&
+		test_path_is_file $midx &&
+		test_path_is_file $midx-$(midx_checksum $objdir).bitmap &&
+
+		test-tool bitmap list-commits | sort >bitmaps &&
+		comm -13 bitmaps commits >before &&
+		test_line_count = 1 before &&
+
+		rm -fr $midx-$(midx_checksum $objdir).bitmap &&
+		rm -fr $midx &&
+
+		# instead of constructing the snapshot ourselves (c.f., the test
+		# "write a bitmap with --refs-snapshot (preferred tips)" in
+		# t5326), mark the missing commit as preferred by adding it to
+		# the pack.preferBitmapTips configuration.
+		git for-each-ref --format="%(refname:rstrip=1)" \
+			--points-at="$(cat before)" >missing &&
+		git config pack.preferBitmapTips "$(cat missing)" &&
+		git repack --write-midx --write-bitmap-index &&
+
+		test-tool bitmap list-commits | sort >bitmaps &&
+		comm -13 bitmaps commits >after &&
+
+		! test_cmp before after
+	)
+'
+
+# The first argument is expected to be a filename
+# and that file should contain the name of a .idx
+# file. Send the list of objects in that .idx file
+# into stdout.
+get_sorted_objects_from_pack () {
+	git show-index <$(cat "$1") >raw &&
+	cut -d" " -f2 raw
+}
+
+test_expect_success '--write-midx -b packs non-kept objects' '
+	git init repo &&
+	test_when_finished "rm -fr repo" &&
+	(
+		cd repo &&
+
+		# Create a kept pack-file
+		test_commit base &&
+		git repack -ad &&
+		find $objdir/pack -name "*.idx" >before &&
+		test_line_count = 1 before &&
+		before_name=$(cat before) &&
+		>${before_name%.idx}.keep &&
+
+		# Create a non-kept pack-file
+		test_commit other &&
+		git repack &&
+
+		# Create loose objects
+		test_commit loose &&
+
+		# Repack everything
+		git repack --write-midx -a -b -d &&
+
+		# There should be two pack-files now, the
+		# old, kept pack and the new, non-kept pack.
+		find $objdir/pack -name "*.idx" | sort >after &&
+		test_line_count = 2 after &&
+		find $objdir/pack -name "*.keep" >kept &&
+		kept_name=$(cat kept) &&
+		echo ${kept_name%.keep}.idx >kept-idx &&
+		test_cmp before kept-idx &&
+
+		# Get object list from the kept pack.
+		get_sorted_objects_from_pack before >old.objects &&
+
+		# Get object list from the one non-kept pack-file
+		comm -13 before after >new-pack &&
+		test_line_count = 1 new-pack &&
+		get_sorted_objects_from_pack new-pack >new.objects &&
+
+		# None of the objects in the new pack should
+		# exist within the kept pack.
+		comm -12 old.objects new.objects >shared.objects &&
+		test_must_be_empty shared.objects
+	)
+'
+
+test_expect_success '--write-midx removes stale pack-based bitmaps' '
+	rm -fr repo &&
+	git init repo &&
+	test_when_finished "rm -fr repo" &&
+	(
+		cd repo &&
+		test_commit base &&
+		GIT_TEST_MULTI_PACK_INDEX=0 git repack -Ab &&
+
+		pack_bitmap=$(ls $objdir/pack/pack-*.bitmap) &&
+		test_path_is_file "$pack_bitmap" &&
+
+		test_commit tip &&
+		GIT_TEST_MULTI_PACK_INDEX=0 git repack -bm &&
+
+		test_path_is_file $midx &&
+		test_path_is_file $midx-$(midx_checksum $objdir).bitmap &&
+		test_path_is_missing $pack_bitmap
+	)
+'
+
+test_expect_success '--write-midx with --pack-kept-objects' '
+	git init repo &&
+	test_when_finished "rm -fr repo" &&
+	(
+		cd repo &&
+
+		test_commit one &&
+		test_commit two &&
+
+		one="$(echo "one" | git pack-objects --revs $objdir/pack/pack)" &&
+		two="$(echo "one..two" | git pack-objects --revs $objdir/pack/pack)" &&
+
+		keep="$objdir/pack/pack-$one.keep" &&
+		touch "$keep" &&
+
+		GIT_TEST_MULTI_PACK_INDEX=0 \
+		git repack --write-midx --write-bitmap-index --geometric=2 -d \
+			--pack-kept-objects &&
+
+		test_path_is_file $keep &&
+		test_path_is_file $midx &&
+		test_path_is_file $midx-$(midx_checksum $objdir).bitmap
+	)
+'
+
+test_expect_success TTY '--quiet disables progress' '
+	test_terminal env GIT_PROGRESS_DELAY=0 \
+		git -C midx repack -ad --quiet --write-midx 2>stderr &&
+	test_must_be_empty stderr
+'
+
+test_expect_success 'clean up .tmp-* packs on error' '
+	test_must_fail ok=sigpipe git \
+		-c repack.cruftwindow=bogus \
+		repack -ad --cruft &&
+	find $objdir/pack -name '.tmp-*' >tmpfiles &&
+	test_must_be_empty tmpfiles
+'
+
+test_expect_success 'repack -ad cleans up old .tmp-* packs' '
+	git rev-parse HEAD >input &&
+	git pack-objects $objdir/pack/.tmp-1234 <input &&
+	git repack -ad &&
+	find $objdir/pack -name '.tmp-*' >tmpfiles &&
+	test_must_be_empty tmpfiles
+'
+
+test_expect_success 'setup for update-server-info' '
+	git init update-server-info &&
+	test_commit -C update-server-info message
+'
+
+test_server_info_present () {
+	test_path_is_file update-server-info/.git/objects/info/packs &&
+	test_path_is_file update-server-info/.git/info/refs
+}
+
+test_server_info_missing () {
+	test_path_is_missing update-server-info/.git/objects/info/packs &&
+	test_path_is_missing update-server-info/.git/info/refs
+}
+
+test_server_info_cleanup () {
+	rm -f update-server-info/.git/objects/info/packs update-server-info/.git/info/refs &&
+	test_server_info_missing
+}
+
+test_expect_success 'updates server info by default' '
+	test_server_info_cleanup &&
+	git -C update-server-info repack &&
+	test_server_info_present
+'
+
+test_expect_success '-n skips updating server info' '
+	test_server_info_cleanup &&
+	git -C update-server-info repack -n &&
+	test_server_info_missing
+'
+
+test_expect_success 'repack.updateServerInfo=true updates server info' '
+	test_server_info_cleanup &&
+	git -C update-server-info -c repack.updateServerInfo=true repack &&
+	test_server_info_present
+'
+
+test_expect_success 'repack.updateServerInfo=false skips updating server info' '
+	test_server_info_cleanup &&
+	git -C update-server-info -c repack.updateServerInfo=false repack &&
+	test_server_info_missing
+'
+
+test_expect_success '-n overrides repack.updateServerInfo=true' '
+	test_server_info_cleanup &&
+	git -C update-server-info -c repack.updateServerInfo=true repack -n &&
+	test_server_info_missing
+'
+
 test_done
diff --git a/t/t7701-repack-unpack-unreachable.sh b/t/t7701-repack-unpack-unreachable.sh
index 48261ba..fe6c3e7 100755
--- a/t/t7701-repack-unpack-unreachable.sh
+++ b/t/t7701-repack-unpack-unreachable.sh
@@ -2,6 +2,10 @@
 
 test_description='git repack works correctly'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 fsha1=
@@ -22,7 +26,7 @@ test_expect_success '-A with -d option leaves unreachable objects unpacked' '
 	git commit -a -m more_content &&
 	csha1=$(git rev-parse HEAD^{commit}) &&
 	tsha1=$(git rev-parse HEAD^{tree}) &&
-	git checkout master &&
+	git checkout main &&
 	echo even more content >> file1 &&
 	test_tick &&
 	git commit -a -m even_more_content &&
@@ -32,7 +36,7 @@ test_expect_success '-A with -d option leaves unreachable objects unpacked' '
 	git repack -A -d -l &&
 	# verify objects are packed in repository
 	test 3 = $(git verify-pack -v -- .git/objects/pack/*.idx |
-		   egrep "^($fsha1|$csha1|$tsha1) " |
+		   grep -E "^($fsha1|$csha1|$tsha1) " |
 		   sort | uniq | wc -l) &&
 	git show $fsha1 &&
 	git show $csha1 &&
@@ -46,7 +50,7 @@ test_expect_success '-A with -d option leaves unreachable objects unpacked' '
 	git repack -A -d -l &&
 	# verify objects are retained unpacked
 	test 0 = $(git verify-pack -v -- .git/objects/pack/*.idx |
-		   egrep "^($fsha1|$csha1|$tsha1) " |
+		   grep -E "^($fsha1|$csha1|$tsha1) " |
 		   sort | uniq | wc -l) &&
 	git show $fsha1 &&
 	git show $csha1 &&
@@ -109,6 +113,48 @@ test_expect_success 'do not bother loosening old objects' '
 	test_must_fail git cat-file -p $obj2
 '
 
+test_expect_success 'gc.recentObjectsHook' '
+	obj1=$(echo one | git hash-object -w --stdin) &&
+	obj2=$(echo two | git hash-object -w --stdin) &&
+	obj3=$(echo three | git hash-object -w --stdin) &&
+	pack1=$(echo $obj1 | git pack-objects .git/objects/pack/pack) &&
+	pack2=$(echo $obj2 | git pack-objects .git/objects/pack/pack) &&
+	pack3=$(echo $obj3 | git pack-objects .git/objects/pack/pack) &&
+	git prune-packed &&
+
+	git cat-file -p $obj1 &&
+	git cat-file -p $obj2 &&
+	git cat-file -p $obj3 &&
+
+	# make an unreachable annotated tag object to ensure we rescue objects
+	# which are reachable from non-pruned unreachable objects
+	obj2_tag="$(git mktag <<-EOF
+	object $obj2
+	type blob
+	tag obj2-tag
+	tagger T A Gger <tagger@example.com> 1234567890 -0000
+	EOF
+	)" &&
+
+	obj2_tag_pack="$(echo $obj2_tag | git pack-objects .git/objects/pack/pack)" &&
+	git prune-packed &&
+
+	write_script precious-objects <<-EOF &&
+	echo $obj2_tag
+	EOF
+	git config gc.recentObjectsHook ./precious-objects &&
+
+	test-tool chmtime =-86400 .git/objects/pack/pack-$pack2.pack &&
+	test-tool chmtime =-86400 .git/objects/pack/pack-$pack3.pack &&
+	test-tool chmtime =-86400 .git/objects/pack/pack-$obj2_tag_pack.pack &&
+	git repack -A -d --unpack-unreachable=1.hour.ago &&
+
+	git cat-file -p $obj1 &&
+	git cat-file -p $obj2 &&
+	git cat-file -p $obj2_tag &&
+	test_must_fail git cat-file -p $obj3
+'
+
 test_expect_success 'keep packed objects found only in index' '
 	echo my-unique-content >file &&
 	git add file &&
diff --git a/t/t7702-repack-cyclic-alternate.sh b/t/t7702-repack-cyclic-alternate.sh
index 93b7486..f3cdb98 100755
--- a/t/t7702-repack-cyclic-alternate.sh
+++ b/t/t7702-repack-cyclic-alternate.sh
@@ -4,6 +4,8 @@
 #
 
 test_description='repack involving cyclic alternate'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
diff --git a/t/t7703-repack-geometric.sh b/t/t7703-repack-geometric.sh
new file mode 100755
index 0000000..9fc1626
--- /dev/null
+++ b/t/t7703-repack-geometric.sh
@@ -0,0 +1,448 @@
+#!/bin/sh
+
+test_description='git repack --geometric works correctly'
+
+. ./test-lib.sh
+
+GIT_TEST_MULTI_PACK_INDEX=0
+
+objdir=.git/objects
+packdir=$objdir/pack
+midx=$objdir/pack/multi-pack-index
+
+packed_objects () {
+	git show-index <"$1" >tmp-object-list &&
+	cut -d' ' -f2 tmp-object-list | sort &&
+	rm tmp-object-list
+ }
+
+test_expect_success '--geometric with no packs' '
+	git init geometric &&
+	test_when_finished "rm -fr geometric" &&
+	(
+		cd geometric &&
+
+		git repack --write-midx --geometric 2 >out &&
+		test_grep "Nothing new to pack" out
+	)
+'
+
+test_expect_success '--geometric with one pack' '
+	git init geometric &&
+	test_when_finished "rm -fr geometric" &&
+	(
+		cd geometric &&
+
+		test_commit "base" &&
+		git repack -d &&
+
+		git repack --geometric 2 >out &&
+
+		test_grep "Nothing new to pack" out
+	)
+'
+
+test_expect_success '--geometric with an intact progression' '
+	git init geometric &&
+	test_when_finished "rm -fr geometric" &&
+	(
+		cd geometric &&
+
+		# These packs already form a geometric progression.
+		test_commit_bulk --start=1 1 && # 3 objects
+		test_commit_bulk --start=2 2 && # 6 objects
+		test_commit_bulk --start=4 4 && # 12 objects
+
+		find $objdir/pack -name "*.pack" | sort >expect &&
+		git repack --geometric 2 -d &&
+		find $objdir/pack -name "*.pack" | sort >actual &&
+
+		test_cmp expect actual
+	)
+'
+
+test_expect_success '--geometric with loose objects' '
+	git init geometric &&
+	test_when_finished "rm -fr geometric" &&
+	(
+		cd geometric &&
+
+		# These packs already form a geometric progression.
+		test_commit_bulk --start=1 1 && # 3 objects
+		test_commit_bulk --start=2 2 && # 6 objects
+		# The loose objects are packed together, breaking the
+		# progression.
+		test_commit loose && # 3 objects
+
+		find $objdir/pack -name "*.pack" | sort >before &&
+		git repack --geometric 2 -d &&
+		find $objdir/pack -name "*.pack" | sort >after &&
+
+		comm -13 before after >new &&
+		comm -23 before after >removed &&
+
+		test_line_count = 1 new &&
+		test_must_be_empty removed &&
+
+		git repack --geometric 2 -d &&
+		find $objdir/pack -name "*.pack" | sort >after &&
+
+		# The progression (3, 3, 6) is combined into one new pack.
+		test_line_count = 1 after
+	)
+'
+
+test_expect_success '--geometric with small-pack rollup' '
+	git init geometric &&
+	test_when_finished "rm -fr geometric" &&
+	(
+		cd geometric &&
+
+		test_commit_bulk --start=1 1 && # 3 objects
+		test_commit_bulk --start=2 1 && # 3 objects
+		find $objdir/pack -name "*.pack" | sort >small &&
+		test_commit_bulk --start=3 4 && # 12 objects
+		test_commit_bulk --start=7 8 && # 24 objects
+		find $objdir/pack -name "*.pack" | sort >before &&
+
+		git repack --geometric 2 -d &&
+
+		# Three packs in total; two of the existing large ones, and one
+		# new one.
+		find $objdir/pack -name "*.pack" | sort >after &&
+		test_line_count = 3 after &&
+		comm -3 small before | tr -d "\t" >large &&
+		grep -qFf large after
+	)
+'
+
+test_expect_success '--geometric with small- and large-pack rollup' '
+	git init geometric &&
+	test_when_finished "rm -fr geometric" &&
+	(
+		cd geometric &&
+
+		# size(small1) + size(small2) > size(medium) / 2
+		test_commit_bulk --start=1 1 && # 3 objects
+		test_commit_bulk --start=2 1 && # 3 objects
+		test_commit_bulk --start=2 3 && # 7 objects
+		test_commit_bulk --start=6 9 && # 27 objects &&
+
+		find $objdir/pack -name "*.pack" | sort >before &&
+
+		git repack --geometric 2 -d &&
+
+		find $objdir/pack -name "*.pack" | sort >after &&
+		comm -12 before after >untouched &&
+
+		# Two packs in total; the largest pack from before running "git
+		# repack", and one new one.
+		test_line_count = 1 untouched &&
+		test_line_count = 2 after
+	)
+'
+
+test_expect_success '--geometric ignores kept packs' '
+	git init geometric &&
+	test_when_finished "rm -fr geometric" &&
+	(
+		cd geometric &&
+
+		test_commit kept && # 3 objects
+		test_commit pack && # 3 objects
+
+		KEPT=$(git pack-objects --revs $objdir/pack/pack <<-EOF
+		refs/tags/kept
+		EOF
+		) &&
+		PACK=$(git pack-objects --revs $objdir/pack/pack <<-EOF
+		refs/tags/pack
+		^refs/tags/kept
+		EOF
+		) &&
+
+		# neither pack contains more than twice the number of objects in
+		# the other, so they should be combined. but, marking one as
+		# .kept on disk will "freeze" it, so the pack structure should
+		# remain unchanged.
+		touch $objdir/pack/pack-$KEPT.keep &&
+
+		find $objdir/pack -name "*.pack" | sort >before &&
+		git repack --geometric 2 -d &&
+		find $objdir/pack -name "*.pack" | sort >after &&
+
+		# both packs should still exist
+		test_path_is_file $objdir/pack/pack-$KEPT.pack &&
+		test_path_is_file $objdir/pack/pack-$PACK.pack &&
+
+		# and no new packs should be created
+		test_cmp before after &&
+
+		# Passing --pack-kept-objects causes packs with a .keep file to
+		# be repacked, too.
+		git repack --geometric 2 -d --pack-kept-objects &&
+
+		# After repacking, two packs remain: one new one (containing the
+		# objects in both the .keep and non-kept pack), and the .keep
+		# pack (since `--pack-kept-objects -d` does not actually delete
+		# the kept pack).
+		find $objdir/pack -name "*.pack" >after &&
+		test_line_count = 2 after
+	)
+'
+
+test_expect_success '--geometric ignores --keep-pack packs' '
+	git init geometric &&
+	test_when_finished "rm -fr geometric" &&
+	(
+		cd geometric &&
+
+		# Create two equal-sized packs
+		test_commit kept && # 3 objects
+		git repack -d &&
+		test_commit pack && # 3 objects
+		git repack -d &&
+
+		find $objdir/pack -type f -name "*.pack" | sort >packs.before &&
+		git repack --geometric 2 -dm \
+			--keep-pack="$(basename "$(head -n 1 packs.before)")" >out &&
+		find $objdir/pack -type f -name "*.pack" | sort >packs.after &&
+
+		# Packs should not have changed (only one non-kept pack, no
+		# loose objects), but $midx should now exist.
+		grep "Nothing new to pack" out &&
+		test_path_is_file $midx &&
+
+		test_cmp packs.before packs.after &&
+
+		git fsck
+	)
+'
+
+test_expect_success '--geometric chooses largest MIDX preferred pack' '
+	git init geometric &&
+	test_when_finished "rm -fr geometric" &&
+	(
+		cd geometric &&
+
+		# These packs already form a geometric progression.
+		test_commit_bulk --start=1 1 && # 3 objects
+		test_commit_bulk --start=2 2 && # 6 objects
+		ls $objdir/pack/pack-*.idx >before &&
+		test_commit_bulk --start=4 4 && # 12 objects
+		ls $objdir/pack/pack-*.idx >after &&
+
+		git repack --geometric 2 -dbm &&
+
+		comm -3 before after | xargs -n 1 basename >expect &&
+		test-tool read-midx --preferred-pack $objdir >actual &&
+
+		test_cmp expect actual
+	)
+'
+
+test_expect_success '--geometric with pack.packSizeLimit' '
+	git init pack-rewrite &&
+	test_when_finished "rm -fr pack-rewrite" &&
+	(
+		cd pack-rewrite &&
+
+		test-tool genrandom foo 1048576 >foo &&
+		test-tool genrandom bar 1048576 >bar &&
+
+		git add foo bar &&
+		test_tick &&
+		git commit -m base &&
+
+		git rev-parse HEAD:foo HEAD:bar >p1.objects &&
+		git rev-parse HEAD HEAD^{tree} >p2.objects &&
+
+		# These two packs each contain two objects, so the following
+		# `--geometric` repack will try to combine them.
+		p1="$(git pack-objects $packdir/pack <p1.objects)" &&
+		p2="$(git pack-objects $packdir/pack <p2.objects)" &&
+
+		# Remove any loose objects in packs, since we do not want extra
+		# copies around (which would mask over potential object
+		# corruption issues).
+		git prune-packed &&
+
+		# Both p1 and p2 will be rolled up, but pack-objects will write
+		# three packs:
+		#
+		#   - one containing object "foo",
+		#   - another containing object "bar",
+		#   - a final pack containing the commit and tree objects
+		#     (identical to p2 above)
+		git repack --geometric 2 -d --max-pack-size=1048576 &&
+
+		# Ensure `repack` can detect that the third pack it wrote
+		# (containing just the tree and commit objects) was identical to
+		# one that was below the geometric split, so that we can save it
+		# from deletion.
+		#
+		# If `repack` fails to do that, we will incorrectly delete p2,
+		# causing object corruption.
+		git fsck
+	)
+'
+
+test_expect_success '--geometric --write-midx with packfiles in main and alternate ODB' '
+	test_when_finished "rm -fr shared member" &&
+
+	# Create a shared repository that will serve as the alternate object
+	# database for the member linked to it. It has got some objects on its
+	# own that are packed into a single packfile.
+	git init shared &&
+	test_commit -C shared common-object &&
+	git -C shared repack -ad &&
+
+	# We create member so that its alternates file points to the shared
+	# repository. We then create a commit in it so that git-repack(1) has
+	# something to repack.
+	# of the shared object database.
+	git clone --shared shared member &&
+	test_commit -C member unique-object &&
+	git -C member repack --geometric=2 --write-midx 2>err &&
+	test_must_be_empty err &&
+
+	# We should see that a new packfile was generated.
+	find shared/.git/objects/pack -type f -name "*.pack" >packs &&
+	test_line_count = 1 packs &&
+
+	# We should also see a multi-pack-index. This multi-pack-index should
+	# never refer to any packfiles in the alternate object database.
+	test_path_is_file member/.git/objects/pack/multi-pack-index &&
+	test-tool read-midx member/.git/objects >packs.midx &&
+	grep "^pack-.*\.idx$" packs.midx | sort >actual &&
+	basename member/.git/objects/pack/pack-*.idx >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success '--geometric --with-midx with no local objects' '
+	test_when_finished "rm -fr shared member" &&
+
+	# Create a repository with a single packfile that acts as alternate
+	# object database.
+	git init shared &&
+	test_commit -C shared "shared-objects" &&
+	git -C shared repack -ad &&
+
+	# Create a second repository linked to the first one and perform a
+	# geometric repack on it.
+	git clone --shared shared member &&
+	git -C member repack --geometric 2 --write-midx 2>err &&
+	test_must_be_empty err &&
+
+	# Assert that we wrote neither a new packfile nor a multi-pack-index.
+	# We should not have a packfile because the single packfile in the
+	# alternate object database does not invalidate the geometric sequence.
+	# And we should not have a multi-pack-index because these only index
+	# local packfiles, and there are none.
+	test_dir_is_empty member/$packdir
+'
+
+test_expect_success '--geometric with same pack in main and alternate ODB' '
+	test_when_finished "rm -fr shared member" &&
+
+	# Create a repository with a single packfile that acts as alternate
+	# object database.
+	git init shared &&
+	test_commit -C shared "shared-objects" &&
+	git -C shared repack -ad &&
+
+	# We create the member repository as an exact copy so that it has the
+	# same packfile.
+	cp -r shared member &&
+	test-tool path-utils real_path shared/.git/objects >member/.git/objects/info/alternates &&
+	find shared/.git/objects -type f >expected-files &&
+
+	# Verify that we can repack objects as expected without observing any
+	# error. Having the same packfile in both ODBs used to cause an error
+	# in git-pack-objects(1).
+	git -C member repack --geometric 2 2>err &&
+	test_must_be_empty err &&
+	# Nothing should have changed.
+	find shared/.git/objects -type f >actual-files &&
+	test_cmp expected-files actual-files
+'
+
+test_expect_success '--geometric -l with non-intact geometric sequence across ODBs' '
+	test_when_finished "rm -fr shared member" &&
+
+	git init shared &&
+	test_commit_bulk -C shared --start=1 1 &&
+
+	git clone --shared shared member &&
+	test_commit_bulk -C member --start=2 1 &&
+
+	# Verify that our assumptions actually hold: both generated packfiles
+	# should have three objects and should be non-equal.
+	packed_objects shared/.git/objects/pack/pack-*.idx >shared-objects &&
+	packed_objects member/.git/objects/pack/pack-*.idx >member-objects &&
+	test_line_count = 3 shared-objects &&
+	test_line_count = 3 member-objects &&
+	! test_cmp shared-objects member-objects &&
+
+	# Perform the geometric repack. With `-l`, we should only see the local
+	# packfile and thus arrive at the conclusion that the geometric
+	# sequence is intact. We thus expect no changes.
+	#
+	# Note that we are tweaking mtimes of the packfiles so that we can
+	# verify they did not change. This is done in order to detect the case
+	# where we do repack objects, but the resulting packfile is the same.
+	test-tool chmtime --verbose =0 member/.git/objects/pack/* >expected-member-packs &&
+	git -C member repack --geometric=2 -l -d &&
+	test-tool chmtime --verbose member/.git/objects/pack/* >actual-member-packs &&
+	test_cmp expected-member-packs actual-member-packs &&
+
+	{
+		packed_objects shared/.git/objects/pack/pack-*.idx &&
+		packed_objects member/.git/objects/pack/pack-*.idx
+	} | sort >expected-objects &&
+
+	# On the other hand, when doing a non-local geometric repack we should
+	# see both packfiles and thus repack them. We expect that the shared
+	# object database was not changed.
+	test-tool chmtime --verbose =0 shared/.git/objects/pack/* >expected-shared-packs &&
+	git -C member repack --geometric=2 -d &&
+	test-tool chmtime --verbose shared/.git/objects/pack/* >actual-shared-packs &&
+	test_cmp expected-shared-packs actual-shared-packs &&
+
+	# Furthermore, we expect that the member repository now has a single
+	# packfile that contains the combined shared and non-shared objects.
+	ls member/.git/objects/pack/pack-*.idx >actual &&
+	test_line_count = 1 actual &&
+	packed_objects member/.git/objects/pack/pack-*.idx >actual-objects &&
+	test_line_count = 6 actual-objects &&
+	test_cmp expected-objects actual-objects
+'
+
+test_expect_success '--geometric -l disables writing bitmaps with non-local packfiles' '
+	test_when_finished "rm -fr shared member" &&
+
+	git init shared &&
+	test_commit_bulk -C shared --start=1 1 &&
+
+	git clone --shared shared member &&
+	test_commit_bulk -C member --start=2 1 &&
+
+	# When performing a geometric repack with `-l` while connected to an
+	# alternate object database that has a packfile we do not have full
+	# coverage of objects. As a result, we expect that writing the bitmap
+	# will be disabled.
+	git -C member repack -l --geometric=2 --write-midx --write-bitmap-index 2>err &&
+	cat >expect <<-EOF &&
+	warning: disabling bitmap writing, as some objects are not being packed
+	EOF
+	test_cmp expect err &&
+	test_path_is_missing member/.git/objects/pack/multi-pack-index-*.bitmap &&
+
+	# On the other hand, when we repack without `-l`, we should see that
+	# the bitmap gets created.
+	git -C member repack --geometric=2 --write-midx --write-bitmap-index 2>err &&
+	test_must_be_empty err &&
+	test_path_is_file member/.git/objects/pack/multi-pack-index-*.bitmap
+'
+
+test_done
diff --git a/t/t7704-repack-cruft.sh b/t/t7704-repack-cruft.sh
new file mode 100755
index 0000000..71e1ef3
--- /dev/null
+++ b/t/t7704-repack-cruft.sh
@@ -0,0 +1,414 @@
+#!/bin/sh
+
+test_description='git repack works correctly'
+
+. ./test-lib.sh
+
+objdir=.git/objects
+packdir=$objdir/pack
+
+test_expect_success '--expire-to stores pruned objects (now)' '
+	git init expire-to-now &&
+	(
+		cd expire-to-now &&
+
+		git branch -M main &&
+
+		test_commit base &&
+
+		git checkout -b cruft &&
+		test_commit --no-tag cruft &&
+
+		git rev-list --objects --no-object-names main..cruft >moved.raw &&
+		sort moved.raw >moved.want &&
+
+		git rev-list --all --objects --no-object-names >expect.raw &&
+		sort expect.raw >expect &&
+
+		git checkout main &&
+		git branch -D cruft &&
+		git reflog expire --all --expire=all &&
+
+		git init --bare expired.git &&
+		git repack -d \
+			--cruft --cruft-expiration="now" \
+			--expire-to="expired.git/objects/pack/pack" &&
+
+		expired="$(ls expired.git/objects/pack/pack-*.idx)" &&
+		test_path_is_file "${expired%.idx}.mtimes" &&
+
+		# Since the `--cruft-expiration` is "now", the effective
+		# behavior is to move _all_ unreachable objects out to
+		# the location in `--expire-to`.
+		git show-index <$expired >expired.raw &&
+		cut -d" " -f2 expired.raw | sort >expired.objects &&
+		git rev-list --all --objects --no-object-names \
+			>remaining.objects &&
+
+		# ...in other words, the combined contents of this
+		# repository and expired.git should be the same as the
+		# set of objects we started with.
+		sort expired.objects remaining.objects >actual &&
+		test_cmp expect actual &&
+
+		# The "moved" objects (i.e., those in expired.git)
+		# should be the same as the cruft objects which were
+		# expired in the previous step.
+		test_cmp moved.want expired.objects
+	)
+'
+
+test_expect_success '--expire-to stores pruned objects (5.minutes.ago)' '
+	git init expire-to-5.minutes.ago &&
+	(
+		cd expire-to-5.minutes.ago &&
+
+		git branch -M main &&
+
+		test_commit base &&
+
+		# Create two classes of unreachable objects, one which
+		# is older than 5 minutes (stale), and another which is
+		# newer (recent).
+		for kind in stale recent
+		do
+			git checkout -b $kind main &&
+			test_commit --no-tag $kind || return 1
+		done &&
+
+		git rev-list --objects --no-object-names main..stale >in &&
+		stale="$(git pack-objects $objdir/pack/pack <in)" &&
+		mtime="$(test-tool chmtime --get =-600 $objdir/pack/pack-$stale.pack)" &&
+
+		# expect holds the set of objects we expect to find in
+		# this repository after repacking
+		git rev-list --objects --no-object-names recent >expect.raw &&
+		sort expect.raw >expect &&
+
+		# moved.want holds the set of objects we expect to find
+		# in expired.git
+		git rev-list --objects --no-object-names main..stale >out &&
+		sort out >moved.want &&
+
+		git checkout main &&
+		git branch -D stale recent &&
+		git reflog expire --all --expire=all &&
+		git prune-packed &&
+
+		git init --bare expired.git &&
+		git repack -d \
+			--cruft --cruft-expiration=5.minutes.ago \
+			--expire-to="expired.git/objects/pack/pack" &&
+
+		# Some of the remaining objects in this repository are
+		# unreachable, so use `cat-file --batch-all-objects`
+		# instead of `rev-list` to get their names
+		git cat-file --batch-all-objects --batch-check="%(objectname)" \
+			>remaining.objects &&
+		sort remaining.objects >actual &&
+		test_cmp expect actual &&
+
+		(
+			cd expired.git &&
+
+			expired="$(ls objects/pack/pack-*.mtimes)" &&
+			test-tool pack-mtimes $(basename $expired) >out &&
+			cut -d" " -f1 out | sort >../moved.got &&
+
+			# Ensure that there are as many objects with the
+			# expected mtime as were moved to expired.git.
+			#
+			# In other words, ensure that the recorded
+			# mtimes of any moved objects was written
+			# correctly.
+			grep " $mtime$" out >matching &&
+			test_line_count = $(wc -l <../moved.want) matching
+		) &&
+		test_cmp moved.want moved.got
+	)
+'
+
+generate_random_blob() {
+	test-tool genrandom "$@" >blob &&
+	git hash-object -w -t blob blob &&
+	rm blob
+}
+
+pack_random_blob () {
+	generate_random_blob "$@" &&
+	git repack -d -q >/dev/null
+}
+
+generate_cruft_pack () {
+	pack_random_blob "$@" >/dev/null &&
+
+	ls $packdir/pack-*.pack | xargs -n 1 basename >in &&
+	pack="$(git pack-objects --cruft $packdir/pack <in)" &&
+	git prune-packed &&
+
+	echo "$packdir/pack-$pack.mtimes"
+}
+
+test_expect_success '--max-cruft-size creates new packs when above threshold' '
+	git init max-cruft-size-large &&
+	(
+		cd max-cruft-size-large &&
+		test_commit base &&
+
+		foo="$(pack_random_blob foo $((1*1024*1024)))" &&
+		git repack --cruft -d &&
+		cruft_foo="$(ls $packdir/pack-*.mtimes)" &&
+
+		bar="$(pack_random_blob bar $((1*1024*1024)))" &&
+		git repack --cruft -d --max-cruft-size=1M &&
+		cruft_bar="$(ls $packdir/pack-*.mtimes | grep -v $cruft_foo)" &&
+
+		test-tool pack-mtimes $(basename "$cruft_foo") >foo.objects &&
+		test-tool pack-mtimes $(basename "$cruft_bar") >bar.objects &&
+
+		grep "^$foo" foo.objects &&
+		test_line_count = 1 foo.objects &&
+		grep "^$bar" bar.objects &&
+		test_line_count = 1 bar.objects
+	)
+'
+
+test_expect_success '--max-cruft-size combines existing packs when below threshold' '
+	git init max-cruft-size-small &&
+	(
+		cd max-cruft-size-small &&
+		test_commit base &&
+
+		foo="$(pack_random_blob foo $((1*1024*1024)))" &&
+		git repack --cruft -d &&
+
+		bar="$(pack_random_blob bar $((1*1024*1024)))" &&
+		git repack --cruft -d --max-cruft-size=10M &&
+
+		cruft=$(ls $packdir/pack-*.mtimes) &&
+		test-tool pack-mtimes $(basename "$cruft") >cruft.objects &&
+
+		grep "^$foo" cruft.objects &&
+		grep "^$bar" cruft.objects &&
+		test_line_count = 2 cruft.objects
+	)
+'
+
+test_expect_success '--max-cruft-size combines smaller packs first' '
+	git init max-cruft-size-consume-small &&
+	(
+		cd max-cruft-size-consume-small &&
+
+		test_commit base &&
+		git repack -ad &&
+
+		cruft_foo="$(generate_cruft_pack foo 524288)" &&    # 0.5 MiB
+		cruft_bar="$(generate_cruft_pack bar 524288)" &&    # 0.5 MiB
+		cruft_baz="$(generate_cruft_pack baz 1048576)" &&   # 1.0 MiB
+		cruft_quux="$(generate_cruft_pack quux 1572864)" && # 1.5 MiB
+
+		test-tool pack-mtimes "$(basename $cruft_foo)" >expect.raw &&
+		test-tool pack-mtimes "$(basename $cruft_bar)" >>expect.raw &&
+		sort expect.raw >expect.objects &&
+
+		# repacking with `--max-cruft-size=2M` should combine
+		# both 0.5 MiB packs together, instead of, say, one of
+		# the 0.5 MiB packs with the 1.0 MiB pack
+		ls $packdir/pack-*.mtimes | sort >cruft.before &&
+		git repack -d --cruft --max-cruft-size=2M &&
+		ls $packdir/pack-*.mtimes | sort >cruft.after &&
+
+		comm -13 cruft.before cruft.after >cruft.new &&
+		comm -23 cruft.before cruft.after >cruft.removed &&
+
+		test_line_count = 1 cruft.new &&
+		test_line_count = 2 cruft.removed &&
+
+		# the two smaller packs should be rolled up first
+		printf "%s\n" $cruft_foo $cruft_bar | sort >expect.removed &&
+		test_cmp expect.removed cruft.removed &&
+
+		# ...and contain the set of objects rolled up
+		test-tool pack-mtimes "$(basename $(cat cruft.new))" >actual.raw &&
+		sort actual.raw >actual.objects &&
+
+		test_cmp expect.objects actual.objects
+	)
+'
+
+test_expect_success 'setup --max-cruft-size with freshened objects' '
+	git init max-cruft-size-freshen &&
+	(
+		cd max-cruft-size-freshen &&
+
+		test_commit base &&
+		git repack -ad &&
+
+		foo="$(generate_random_blob foo 64)" &&
+		test-tool chmtime --get -10000 \
+			"$objdir/$(test_oid_to_path "$foo")" >foo.mtime &&
+
+		git repack --cruft -d &&
+
+		cruft="$(ls $packdir/pack-*.mtimes)" &&
+		test-tool pack-mtimes "$(basename $cruft)" >actual &&
+		echo "$foo $(cat foo.mtime)" >expect &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success '--max-cruft-size with freshened objects (loose)' '
+	(
+		cd max-cruft-size-freshen &&
+
+		# regenerate the object, setting its mtime to be more recent
+		foo="$(generate_random_blob foo 64)" &&
+		test-tool chmtime --get -100 \
+			"$objdir/$(test_oid_to_path "$foo")" >foo.mtime &&
+
+		git repack --cruft -d &&
+
+		cruft="$(ls $packdir/pack-*.mtimes)" &&
+		test-tool pack-mtimes "$(basename $cruft)" >actual &&
+		echo "$foo $(cat foo.mtime)" >expect &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success '--max-cruft-size with freshened objects (packed)' '
+	(
+		cd max-cruft-size-freshen &&
+
+		# regenerate the object and store it in a packfile,
+		# setting its mtime to be more recent
+		#
+		# store it alongside another cruft object so that we
+		# do not create an identical copy of the existing
+		# cruft pack (which contains $foo).
+		foo="$(generate_random_blob foo 64)" &&
+		bar="$(generate_random_blob bar 64)" &&
+		foo_pack="$(printf "%s\n" $foo $bar | git pack-objects $packdir/pack)" &&
+		git prune-packed &&
+
+		test-tool chmtime --get -10 \
+			"$packdir/pack-$foo_pack.pack" >foo.mtime &&
+
+		git repack --cruft -d &&
+
+		cruft="$(ls $packdir/pack-*.mtimes)" &&
+		test-tool pack-mtimes "$(basename $cruft)" >actual &&
+		echo "$foo $(cat foo.mtime)" >expect.raw &&
+		echo "$bar $(cat foo.mtime)" >>expect.raw &&
+		sort expect.raw >expect &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success '--max-cruft-size with pruning' '
+	git init max-cruft-size-prune &&
+	(
+		cd max-cruft-size-prune &&
+
+		test_commit base &&
+		foo="$(generate_random_blob foo $((1024*1024)))" &&
+		bar="$(generate_random_blob bar $((1024*1024)))" &&
+		baz="$(generate_random_blob baz $((1024*1024)))" &&
+
+		test-tool chmtime -10000 "$objdir/$(test_oid_to_path "$foo")" &&
+
+		git repack -d --cruft --max-cruft-size=1M &&
+
+		# backdate the mtimes of all cruft packs to validate
+		# that they were rewritten as a result of pruning
+		ls $packdir/pack-*.mtimes | sort >cruft.before &&
+		for cruft in $(cat cruft.before)
+		do
+			mtime="$(test-tool chmtime --get -10000 "$cruft")" &&
+			echo $cruft $mtime >>mtimes || return 1
+		done &&
+
+		# repack (and prune) with a --max-cruft-size to ensure
+		# that we appropriately split the resulting set of packs
+		git repack -d --cruft --max-cruft-size=1M \
+			--cruft-expiration=10.seconds.ago &&
+		ls $packdir/pack-*.mtimes | sort >cruft.after &&
+
+		for cruft in $(cat cruft.after)
+		do
+			old_mtime="$(grep $cruft mtimes | cut -d" " -f2)" &&
+			new_mtime="$(test-tool chmtime --get $cruft)" &&
+			test $old_mtime -lt $new_mtime || return 1
+		done &&
+
+		test_line_count = 3 cruft.before &&
+		test_line_count = 2 cruft.after &&
+		test_must_fail git cat-file -e $foo &&
+		git cat-file -e $bar &&
+		git cat-file -e $baz
+	)
+'
+
+test_expect_success '--max-cruft-size ignores non-local packs' '
+	repo="max-cruft-size-non-local" &&
+	git init $repo &&
+	(
+		cd $repo &&
+		test_commit base &&
+		generate_random_blob foo 64 &&
+		git repack --cruft -d
+	) &&
+
+	git clone --reference=$repo $repo $repo-alt &&
+	(
+		cd $repo-alt &&
+
+		test_commit other &&
+		generate_random_blob bar 64 &&
+
+		# ensure that we do not attempt to pick up packs from
+		# the non-alternated repository, which would result in a
+		# crash
+		git repack --cruft --max-cruft-size=1M -d
+	)
+'
+
+test_expect_success 'reachable packs are preferred over cruft ones' '
+	repo="cruft-preferred-packs" &&
+	git init "$repo" &&
+	(
+		cd "$repo" &&
+
+		# This test needs to exercise careful control over when a MIDX
+		# is and is not written. Unset the corresponding TEST variable
+		# accordingly.
+		sane_unset GIT_TEST_MULTI_PACK_INDEX &&
+
+		test_commit base &&
+		test_commit --no-tag cruft &&
+
+		non_cruft="$(echo base | git pack-objects --revs $packdir/pack)" &&
+		# Write a cruft pack which both (a) sorts ahead of the non-cruft
+		# pack in lexical order, and (b) has an older mtime to appease
+		# the MIDX preferred pack selection routine.
+		cruft="$(echo pack-$non_cruft.pack | git pack-objects --cruft $packdir/pack-A)" &&
+		test-tool chmtime -1000 $packdir/pack-A-$cruft.pack &&
+
+		test_commit other &&
+		git repack -d &&
+
+		git repack --geometric 2 -d --write-midx --write-bitmap-index &&
+
+		# After repacking, there are two packs left: one reachable one
+		# (which is the result of combining both of the existing two
+		# non-cruft packs), and one cruft pack.
+		find .git/objects/pack -type f -name "*.pack" >packs &&
+		test_line_count = 2 packs &&
+
+		# Make sure that the pack we just wrote is marked as preferred,
+		# not the cruft one.
+		pack="$(test-tool read-midx --preferred-pack $objdir)" &&
+		test_path_is_missing "$packdir/$(basename "$pack" ".idx").mtimes"
+	)
+'
+
+test_done
diff --git a/t/t7800-difftool.sh b/t/t7800-difftool.sh
index 524f30f..cc917b2 100755
--- a/t/t7800-difftool.sh
+++ b/t/t7800-difftool.sh
@@ -8,6 +8,9 @@ test_description='git-difftool
 Testing basic diff tool invocation
 '
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 difftool_test_setup ()
@@ -25,33 +28,33 @@ prompt_given ()
 
 test_expect_success 'basic usage requires no repo' '
 	test_expect_code 129 git difftool -h >output &&
-	test_i18ngrep ^usage: output &&
+	test_grep ^usage: output &&
 	# create a ceiling directory to prevent Git from finding a repo
 	mkdir -p not/repo &&
 	test_when_finished rm -r not &&
 	test_expect_code 129 \
 	env GIT_CEILING_DIRECTORIES="$(pwd)/not" \
 	git -C not/repo difftool -h >output &&
-	test_i18ngrep ^usage: output
+	test_grep ^usage: output
 '
 
-# Create a file on master and change it on branch
+# Create a file on main and change it on branch
 test_expect_success 'setup' '
-	echo master >file &&
+	echo main >file &&
 	git add file &&
 	git commit -m "added file" &&
 
-	git checkout -b branch master &&
+	git checkout -b branch main &&
 	echo branch >file &&
 	git commit -a -m "branch changed file" &&
-	git checkout master
+	git checkout main
 '
 
 # Configure a custom difftool.<tool>.cmd and use it
 test_expect_success 'custom commands' '
 	difftool_test_setup &&
 	test_config difftool.test-tool.cmd "cat \"\$REMOTE\"" &&
-	echo master >expect &&
+	echo main >expect &&
 	git difftool --no-prompt branch >actual &&
 	test_cmp expect actual &&
 
@@ -63,7 +66,7 @@ test_expect_success 'custom commands' '
 
 test_expect_success 'custom tool commands override built-ins' '
 	test_config difftool.vimdiff.cmd "cat \"\$REMOTE\"" &&
-	echo master >expect &&
+	echo main >expect &&
 	git difftool --tool vimdiff --no-prompt branch >actual &&
 	test_cmp expect actual
 '
@@ -88,67 +91,128 @@ test_expect_success 'difftool forwards arguments to diff' '
 	rm for-diff
 '
 
-test_expect_success 'difftool ignores exit code' '
-	test_config difftool.error.cmd false &&
-	git difftool -y -t error branch
-'
+for opt in '' '--dir-diff'
+do
+	test_expect_success "difftool ${opt:-without options} ignores exit code" '
+		test_config difftool.error.cmd false &&
+		git difftool ${opt} -y -t error branch
+	'
+
+	test_expect_success "difftool ${opt:-without options} forwards exit code with --trust-exit-code" '
+		test_config difftool.error.cmd false &&
+		test_must_fail git difftool ${opt} -y --trust-exit-code -t error branch
+	'
+
+	test_expect_success "difftool ${opt:-without options} forwards exit code with --trust-exit-code for built-ins" '
+		test_config difftool.vimdiff.path false &&
+		test_must_fail git difftool ${opt} -y --trust-exit-code -t vimdiff branch
+	'
+
+	test_expect_success "difftool ${opt:-without options} honors difftool.trustExitCode = true" '
+		test_config difftool.error.cmd false &&
+		test_config difftool.trustExitCode true &&
+		test_must_fail git difftool ${opt} -y -t error branch
+	'
+
+	test_expect_success "difftool ${opt:-without options} honors difftool.trustExitCode = false" '
+		test_config difftool.error.cmd false &&
+		test_config difftool.trustExitCode false &&
+		git difftool ${opt} -y -t error branch
+	'
+
+	test_expect_success "difftool ${opt:-without options} ignores exit code with --no-trust-exit-code" '
+		test_config difftool.error.cmd false &&
+		test_config difftool.trustExitCode true &&
+		git difftool ${opt} -y --no-trust-exit-code -t error branch
+	'
+
+	test_expect_success "difftool ${opt:-without options} stops on error with --trust-exit-code" '
+		test_when_finished "rm -f for-diff .git/fail-right-file" &&
+		test_when_finished "git reset -- for-diff" &&
+		write_script .git/fail-right-file <<-\EOF &&
+		echo failed
+		exit 1
+		EOF
+		>for-diff &&
+		git add for-diff &&
+		test_must_fail git difftool ${opt} -y --trust-exit-code \
+			--extcmd .git/fail-right-file branch >actual &&
+		test_line_count = 1 actual
+	'
+
+	test_expect_success "difftool ${opt:-without options} honors exit status if command not found" '
+		test_config difftool.nonexistent.cmd i-dont-exist &&
+		test_config difftool.trustExitCode false &&
+		if test "${opt}" = --dir-diff
+		then
+			expected_code=127
+		else
+			expected_code=128
+		fi &&
+		test_expect_code ${expected_code} git difftool ${opt} -y -t nonexistent branch
+	'
+done
 
-test_expect_success 'difftool forwards exit code with --trust-exit-code' '
-	test_config difftool.error.cmd false &&
-	test_must_fail git difftool -y --trust-exit-code -t error branch
-'
+test_expect_success 'difftool honors --gui' '
+	difftool_test_setup &&
+	test_config merge.tool bogus-tool &&
+	test_config diff.tool bogus-tool &&
+	test_config diff.guitool test-tool &&
 
-test_expect_success 'difftool forwards exit code with --trust-exit-code for built-ins' '
-	test_config difftool.vimdiff.path false &&
-	test_must_fail git difftool -y --trust-exit-code -t vimdiff branch
+	echo branch >expect &&
+	git difftool --no-prompt --gui branch >actual &&
+	test_cmp expect actual
 '
 
-test_expect_success 'difftool honors difftool.trustExitCode = true' '
-	test_config difftool.error.cmd false &&
-	test_config difftool.trustExitCode true &&
-	test_must_fail git difftool -y -t error branch
-'
+test_expect_success 'difftool with guiDefault auto selects gui tool when there is DISPLAY' '
+	difftool_test_setup &&
+	test_config merge.tool bogus-tool &&
+	test_config diff.tool bogus-tool &&
+	test_config diff.guitool test-tool &&
+	test_config difftool.guiDefault auto &&
+	DISPLAY=SOMETHING && export DISPLAY &&
 
-test_expect_success 'difftool honors difftool.trustExitCode = false' '
-	test_config difftool.error.cmd false &&
-	test_config difftool.trustExitCode false &&
-	git difftool -y -t error branch
+	echo branch >expect &&
+	git difftool --no-prompt branch >actual &&
+	test_cmp expect actual
 '
+test_expect_success 'difftool with guiDefault auto selects regular tool when no DISPLAY' '
+	difftool_test_setup &&
+	test_config diff.guitool bogus-tool &&
+	test_config diff.tool test-tool &&
+	test_config difftool.guiDefault Auto &&
+	DISPLAY= && export DISPLAY &&
 
-test_expect_success 'difftool ignores exit code with --no-trust-exit-code' '
-	test_config difftool.error.cmd false &&
-	test_config difftool.trustExitCode true &&
-	git difftool -y --no-trust-exit-code -t error branch
+	echo branch >expect &&
+	git difftool --no-prompt branch >actual &&
+	test_cmp expect actual
 '
 
-test_expect_success 'difftool stops on error with --trust-exit-code' '
-	test_when_finished "rm -f for-diff .git/fail-right-file" &&
-	test_when_finished "git reset -- for-diff" &&
-	write_script .git/fail-right-file <<-\EOF &&
-	echo failed
-	exit 1
-	EOF
-	>for-diff &&
-	git add for-diff &&
-	test_must_fail git difftool -y --trust-exit-code \
-		--extcmd .git/fail-right-file branch >actual &&
-	test_line_count = 1 actual
-'
+test_expect_success 'difftool with guiDefault true selects gui tool' '
+	difftool_test_setup &&
+	test_config diff.tool bogus-tool &&
+	test_config diff.guitool test-tool &&
+	test_config difftool.guiDefault true &&
 
-test_expect_success 'difftool honors exit status if command not found' '
-	test_config difftool.nonexistent.cmd i-dont-exist &&
-	test_config difftool.trustExitCode false &&
-	test_must_fail git difftool -y -t nonexistent branch
+	DISPLAY= && export DISPLAY &&
+	echo branch >expect &&
+	git difftool --no-prompt branch >actual &&
+	test_cmp expect actual &&
+
+	DISPLAY=Something && export DISPLAY &&
+	echo branch >expect &&
+	git difftool --no-prompt branch >actual &&
+	test_cmp expect actual
 '
 
-test_expect_success 'difftool honors --gui' '
+test_expect_success 'difftool --no-gui trumps config guiDefault' '
 	difftool_test_setup &&
-	test_config merge.tool bogus-tool &&
-	test_config diff.tool bogus-tool &&
-	test_config diff.guitool test-tool &&
+	test_config diff.guitool bogus-tool &&
+	test_config diff.tool test-tool &&
+	test_config difftool.guiDefault true &&
 
 	echo branch >expect &&
-	git difftool --no-prompt --gui branch >actual &&
+	git difftool --no-prompt --no-gui branch >actual &&
 	test_cmp expect actual
 '
 
@@ -311,21 +375,21 @@ test_expect_success 'difftool.<tool>.path' '
 
 test_expect_success 'difftool --extcmd=cat' '
 	echo branch >expect &&
-	echo master >>expect &&
+	echo main >>expect &&
 	git difftool --no-prompt --extcmd=cat branch >actual &&
 	test_cmp expect actual
 '
 
 test_expect_success 'difftool --extcmd cat' '
 	echo branch >expect &&
-	echo master >>expect &&
+	echo main >>expect &&
 	git difftool --no-prompt --extcmd=cat branch >actual &&
 	test_cmp expect actual
 '
 
 test_expect_success 'difftool -x cat' '
 	echo branch >expect &&
-	echo master >>expect &&
+	echo main >>expect &&
 	git difftool --no-prompt -x cat branch >actual &&
 	test_cmp expect actual
 '
@@ -338,7 +402,7 @@ test_expect_success 'difftool --extcmd echo arg1' '
 '
 
 test_expect_success 'difftool --extcmd cat arg1' '
-	echo master >expect &&
+	echo main >expect &&
 	git difftool --no-prompt \
 		--extcmd sh\ -c\ \"cat\ \$1\" branch >actual &&
 	test_cmp expect actual
@@ -351,7 +415,7 @@ test_expect_success 'difftool --extcmd cat arg2' '
 	test_cmp expect actual
 '
 
-# Create a second file on master and a different version on branch
+# Create a second file on main and a different version on branch
 test_expect_success 'setup with 2 files different' '
 	echo m2 >file2 &&
 	git add file2 &&
@@ -361,7 +425,7 @@ test_expect_success 'setup with 2 files different' '
 	echo br2 >file2 &&
 	git add file2 &&
 	git commit -a -m "branch changed file2" &&
-	git checkout master
+	git checkout main
 '
 
 test_expect_success 'say no to the first file' '
@@ -369,14 +433,14 @@ test_expect_success 'say no to the first file' '
 	git difftool -x cat branch <input >output &&
 	grep m2 output &&
 	grep br2 output &&
-	! grep master output &&
+	! grep main output &&
 	! grep branch output
 '
 
 test_expect_success 'say no to the second file' '
 	(echo && echo n) >input &&
 	git difftool -x cat branch <input >output &&
-	grep master output &&
+	grep main output &&
 	grep branch output &&
 	! grep m2 output &&
 	! grep br2 output
@@ -384,7 +448,7 @@ test_expect_success 'say no to the second file' '
 
 test_expect_success 'ending prompt input with EOF' '
 	git difftool -x cat branch </dev/null >output &&
-	! grep master output &&
+	! grep main output &&
 	! grep branch output &&
 	! grep m2 output &&
 	! grep br2 output
@@ -396,9 +460,9 @@ test_expect_success 'difftool --tool-help' '
 '
 
 test_expect_success 'setup change in subdirectory' '
-	git checkout master &&
+	git checkout main &&
 	mkdir sub &&
-	echo master >sub/sub &&
+	echo main >sub/sub &&
 	git add sub/sub &&
 	git commit -m "added sub/sub" &&
 	git tag v1 &&
@@ -440,20 +504,27 @@ run_dir_diff_test () {
 
 run_dir_diff_test 'difftool -d' '
 	git difftool -d $symlinks --extcmd ls branch >output &&
-	grep sub output &&
-	grep file output
+	grep "^sub$" output &&
+	grep "^file$" output
 '
 
 run_dir_diff_test 'difftool --dir-diff' '
 	git difftool --dir-diff $symlinks --extcmd ls branch >output &&
-	grep sub output &&
-	grep file output
+	grep "^sub$" output &&
+	grep "^file$" output
+'
+
+run_dir_diff_test 'difftool --dir-diff avoids repeated slashes in TMPDIR' '
+	TMPDIR="${TMPDIR:-/tmp}////" \
+		git difftool --dir-diff $symlinks --extcmd echo branch >output &&
+	grep -v // output >actual &&
+	test_line_count = 1 actual
 '
 
 run_dir_diff_test 'difftool --dir-diff ignores --prompt' '
 	git difftool --dir-diff $symlinks --prompt --extcmd ls branch >output &&
-	grep sub output &&
-	grep file output
+	grep "^sub$" output &&
+	grep "^file$" output
 '
 
 run_dir_diff_test 'difftool --dir-diff branch from subdirectory' '
@@ -462,11 +533,11 @@ run_dir_diff_test 'difftool --dir-diff branch from subdirectory' '
 		git difftool --dir-diff $symlinks --extcmd ls branch >output &&
 		# "sub" must only exist in "right"
 		# "file" and "file2" must be listed in both "left" and "right"
-		grep sub output >sub-output &&
+		grep "^sub$" output >sub-output &&
 		test_line_count = 1 sub-output &&
-		grep file"$" output >file-output &&
+		grep "^file$" output >file-output &&
 		test_line_count = 2 file-output &&
-		grep file2 output >file2-output &&
+		grep "^file2$" output >file2-output &&
 		test_line_count = 2 file2-output
 	)
 '
@@ -477,11 +548,11 @@ run_dir_diff_test 'difftool --dir-diff v1 from subdirectory' '
 		git difftool --dir-diff $symlinks --extcmd ls v1 >output &&
 		# "sub" and "file" exist in both v1 and HEAD.
 		# "file2" is unchanged.
-		grep sub output >sub-output &&
+		grep "^sub$" output >sub-output &&
 		test_line_count = 2 sub-output &&
-		grep file output >file-output &&
+		grep "^file$" output >file-output &&
 		test_line_count = 2 file-output &&
-		! grep file2 output
+		! grep "^file2$" output
 	)
 '
 
@@ -491,9 +562,9 @@ run_dir_diff_test 'difftool --dir-diff branch from subdirectory w/ pathspec' '
 		git difftool --dir-diff $symlinks --extcmd ls branch -- .>output &&
 		# "sub" only exists in "right"
 		# "file" and "file2" must not be listed
-		grep sub output >sub-output &&
+		grep "^sub$" output >sub-output &&
 		test_line_count = 1 sub-output &&
-		! grep file output
+		! grep "^file$" output
 	)
 '
 
@@ -503,9 +574,9 @@ run_dir_diff_test 'difftool --dir-diff v1 from subdirectory w/ pathspec' '
 		git difftool --dir-diff $symlinks --extcmd ls v1 -- .>output &&
 		# "sub" exists in v1 and HEAD
 		# "file" is filtered out by the pathspec
-		grep sub output >sub-output &&
+		grep "^sub$" output >sub-output &&
 		test_line_count = 2 sub-output &&
-		! grep file output
+		! grep "^file$" output
 	)
 '
 
@@ -518,16 +589,16 @@ run_dir_diff_test 'difftool --dir-diff from subdirectory with GIT_DIR set' '
 		cd sub &&
 		git difftool --dir-diff $symlinks --extcmd ls \
 			branch -- sub >output &&
-		grep sub output &&
-		! grep file output
+		grep "^sub$" output &&
+		! grep "^file$" output
 	)
 '
 
 run_dir_diff_test 'difftool --dir-diff when worktree file is missing' '
 	test_when_finished git reset --hard &&
 	rm file2 &&
-	git difftool --dir-diff $symlinks --extcmd ls branch master >output &&
-	grep file2 output
+	git difftool --dir-diff $symlinks --extcmd ls branch main >output &&
+	grep "^file2$" output
 '
 
 run_dir_diff_test 'difftool --dir-diff with unmerged files' '
@@ -543,7 +614,7 @@ run_dir_diff_test 'difftool --dir-diff with unmerged files' '
 	echo b >>file &&
 	git add file &&
 	git commit -m conflict-b &&
-	git checkout master &&
+	git checkout main &&
 	git merge conflict-a &&
 	test_must_fail git merge conflict-b &&
 	cat >expect <<-EOF &&
@@ -626,6 +697,7 @@ test_expect_success 'difftool --no-symlinks detects conflict ' '
 
 test_expect_success 'difftool properly honors gitlink and core.worktree' '
 	test_when_finished rm -rf submod/ule &&
+	test_config_global protocol.file.allow always &&
 	git submodule add ./. submod/ule &&
 	test_config -C submod/ule diff.tool checktrees &&
 	test_config -C submod/ule difftool.checktrees.cmd '\''
@@ -671,7 +743,6 @@ test_expect_success SYMLINKS 'difftool --dir-diff handles modified symlinks' '
 	rm c &&
 	ln -s d c &&
 	cat >expect <<-EOF &&
-		b
 		c
 
 		c
@@ -707,7 +778,6 @@ test_expect_success SYMLINKS 'difftool --dir-diff handles modified symlinks' '
 	# Deleted symlinks
 	rm -f c &&
 	cat >expect <<-EOF &&
-		b
 		c
 
 	EOF
@@ -720,6 +790,71 @@ test_expect_success SYMLINKS 'difftool --dir-diff handles modified symlinks' '
 	test_cmp expect actual
 '
 
+test_expect_success SYMLINKS 'difftool --dir-diff writes symlinks as raw text' '
+	# Start out on a branch called "branch-init".
+	git init -b branch-init symlink-files &&
+	(
+		cd symlink-files &&
+		# This test ensures that symlinks are written as raw text.
+		# The "cat" tools output link and file contents.
+		git config difftool.cat-left-link.cmd "cat \"\$LOCAL/link\"" &&
+		git config difftool.cat-left-a.cmd "cat \"\$LOCAL/file-a\"" &&
+		git config difftool.cat-right-link.cmd "cat \"\$REMOTE/link\"" &&
+		git config difftool.cat-right-b.cmd "cat \"\$REMOTE/file-b\"" &&
+
+		# Record the empty initial state so that we can come back here
+		# later and not have to consider the any cases where difftool
+		# will create symlinks back into the worktree.
+		test_tick &&
+		git commit --allow-empty -m init &&
+
+		# Create a file called "file-a" with a symlink pointing to it.
+		git switch -c branch-a &&
+		echo a >file-a &&
+		ln -s file-a link &&
+		git add file-a link &&
+		test_tick &&
+		git commit -m link-to-file-a &&
+
+		# Create a file called "file-b" and point the symlink to it.
+		git switch -c branch-b &&
+		echo b >file-b &&
+		rm link &&
+		ln -s file-b link &&
+		git add file-b link &&
+		git rm file-a &&
+		test_tick &&
+		git commit -m link-to-file-b &&
+
+		# Checkout the initial branch so that the --symlinks behavior is
+		# not activated. The two directories should be completely
+		# independent with no symlinks pointing back here.
+		git switch branch-init &&
+
+		# The left link must be "file-a" and "file-a" must contain "a".
+		echo file-a >expect &&
+		git difftool --symlinks --dir-diff --tool cat-left-link \
+			branch-a branch-b >actual &&
+		test_cmp expect actual &&
+
+		echo a >expect &&
+		git difftool --symlinks --dir-diff --tool cat-left-a \
+			branch-a branch-b >actual &&
+		test_cmp expect actual &&
+
+		# The right link must be "file-b" and "file-b" must contain "b".
+		echo file-b >expect &&
+		git difftool --symlinks --dir-diff --tool cat-right-link \
+			branch-a branch-b >actual &&
+		test_cmp expect actual &&
+
+		echo b >expect &&
+		git difftool --symlinks --dir-diff --tool cat-right-b \
+			branch-a branch-b >actual &&
+		test_cmp expect actual
+	)
+'
+
 test_expect_success 'add -N and difftool -d' '
 	test_when_finished git reset --hard &&
 
@@ -728,6 +863,19 @@ test_expect_success 'add -N and difftool -d' '
 	git difftool --dir-diff --extcmd ls
 '
 
+test_expect_success 'difftool --cached with unmerged files' '
+	test_when_finished git reset --hard &&
+
+	test_commit conflicting &&
+	test_commit conflict-a conflict.t a &&
+	git reset --hard conflicting &&
+	test_commit conflict-b conflict.t b &&
+	test_must_fail git merge conflict-a &&
+
+	git difftool --cached --no-prompt >output &&
+	test_must_be_empty output
+'
+
 test_expect_success 'outside worktree' '
 	echo 1 >1 &&
 	echo 2 >2 &&
@@ -746,4 +894,36 @@ test_expect_success 'difftool --gui, --tool and --extcmd are mutually exclusive'
 	test_must_fail git difftool --gui --tool=test-tool --extcmd=cat
 '
 
+test_expect_success 'difftool --rotate-to' '
+	difftool_test_setup &&
+	test_when_finished git reset --hard &&
+	echo 1 >1 &&
+	echo 2 >2 &&
+	echo 4 >4 &&
+	git add 1 2 4 &&
+	git commit -a -m "124" &&
+	git difftool --no-prompt --extcmd=cat --rotate-to="2" HEAD^ >output &&
+	cat >expect <<-\EOF &&
+	2
+	4
+	1
+	EOF
+	test_cmp output expect
+'
+
+test_expect_success 'difftool --skip-to' '
+	difftool_test_setup &&
+	test_when_finished git reset --hard &&
+	git difftool --no-prompt --extcmd=cat --skip-to="2" HEAD^ >output &&
+	cat >expect <<-\EOF &&
+	2
+	4
+	EOF
+	test_cmp output expect
+'
+
+test_expect_success 'difftool --rotate/skip-to error condition' '
+	test_must_fail git difftool --no-prompt --extcmd=cat --rotate-to="3" HEAD^ &&
+	test_must_fail git difftool --no-prompt --extcmd=cat --skip-to="3" HEAD^
+'
 test_done
diff --git a/t/t7810-grep.sh b/t/t7810-grep.sh
index 991d5bd..875dcfd 100755
--- a/t/t7810-grep.sh
+++ b/t/t7810-grep.sh
@@ -6,8 +6,21 @@
 test_description='git grep various.
 '
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
+test_invalid_grep_expression() {
+	params="$@" &&
+	test_expect_success "invalid expression: grep $params" '
+		test_must_fail git grep $params -- nonexisting
+	'
+}
+
+LC_ALL=en_US.UTF-8 test-tool regex '^.$' '¿' &&
+  test_set_prereq MB_REGEX
+
 cat >hello.c <<EOF
 #include <assert.h>
 #include <stdio.h>
@@ -21,28 +34,28 @@ int main(int argc, const char **argv)
 EOF
 
 test_expect_success setup '
-	{
-		echo foo mmap bar
-		echo foo_mmap bar
-		echo foo_mmap bar mmap
-		echo foo mmap bar_mmap
-		echo foo_mmap bar mmap baz
-	} >file &&
-	{
-		echo Hello world
-		echo HeLLo world
-		echo Hello_world
-		echo HeLLo_world
-	} >hello_world &&
-	{
-		echo "a+b*c"
-		echo "a+bc"
-		echo "abc"
-	} >ab &&
-	{
-		echo d &&
-		echo 0
-	} >d0 &&
+	cat >file <<-\EOF &&
+	foo mmap bar
+	foo_mmap bar
+	foo_mmap bar mmap
+	foo mmap bar_mmap
+	foo_mmap bar mmap baz
+	EOF
+	cat >hello_world <<-\EOF &&
+	Hello world
+	HeLLo world
+	Hello_world
+	HeLLo_world
+	EOF
+	cat >ab <<-\EOF &&
+	a+b*c
+	a+bc
+	abc
+	EOF
+	cat >d0 <<-\EOF &&
+	d
+	0
+	EOF
 	echo vvv >v &&
 	echo ww w >w &&
 	echo x x xx x >x &&
@@ -53,13 +66,13 @@ test_expect_success setup '
 	echo vvv >t/v &&
 	mkdir t/a &&
 	echo vvv >t/a/v &&
-	{
-		echo "line without leading space1"
-		echo " line with leading space1"
-		echo " line with leading space2"
-		echo " line with leading space3"
-		echo "line without leading space2"
-	} >space &&
+	qz_to_tab_space >space <<-\EOF &&
+	line without leading space1
+	Zline with leading space1
+	Zline with leading space2
+	Zline with leading space3
+	line without leading space2
+	EOF
 	cat >hello.ps1 <<-\EOF &&
 	# No-op.
 	function dummy() {}
@@ -67,6 +80,7 @@ test_expect_success setup '
 	# Say hello.
 	function hello() {
 	  echo "Hello world."
+	  echo "Hello again."
 	} # hello
 
 	# Still a no-op.
@@ -77,6 +91,10 @@ test_expect_success setup '
 		echo unusual >"\"unusual\" pathname" &&
 		echo unusual >"t/nested \"unusual\" pathname"
 	fi &&
+	if test_have_prereq MB_REGEX
+	then
+		echo "¿" >reverse-question-mark
+	fi &&
 	git add . &&
 	test_tick &&
 	git commit -m initial
@@ -86,6 +104,39 @@ test_expect_success 'grep should not segfault with a bad input' '
 	test_must_fail git grep "("
 '
 
+test_invalid_grep_expression --and -e A
+
+test_pattern_type () {
+	H=$1 &&
+	HC=$2 &&
+	L=$3 &&
+	type=$4 &&
+	shift 4 &&
+
+	expected_str= &&
+	case "$type" in
+	BRE)
+		expected_str="${HC}ab:a+bc"
+		;;
+	ERE)
+		expected_str="${HC}ab:abc"
+		;;
+	FIX)
+		expected_str="${HC}ab:a+b*c"
+		;;
+	*)
+		BUG "unknown pattern type '$type'"
+		;;
+	esac &&
+	config_str="$@" &&
+
+	test_expect_success "grep $L with '$config_str' interpreted as $type" '
+		echo $expected_str >expected &&
+		git $config_str grep "a+b*c" $H ab >actual &&
+		test_cmp expected actual
+	'
+}
+
 for H in HEAD ''
 do
 	case "$H" in
@@ -94,129 +145,129 @@ do
 	esac
 
 	test_expect_success "grep -w $L" '
-		{
-			echo ${HC}file:1:foo mmap bar
-			echo ${HC}file:3:foo_mmap bar mmap
-			echo ${HC}file:4:foo mmap bar_mmap
-			echo ${HC}file:5:foo_mmap bar mmap baz
-		} >expected &&
+		cat >expected <<-EOF &&
+		${HC}file:1:foo mmap bar
+		${HC}file:3:foo_mmap bar mmap
+		${HC}file:4:foo mmap bar_mmap
+		${HC}file:5:foo_mmap bar mmap baz
+		EOF
 		git -c grep.linenumber=false grep -n -w -e mmap $H >actual &&
 		test_cmp expected actual
 	'
 
 	test_expect_success "grep -w $L (with --column)" '
-		{
-			echo ${HC}file:5:foo mmap bar
-			echo ${HC}file:14:foo_mmap bar mmap
-			echo ${HC}file:5:foo mmap bar_mmap
-			echo ${HC}file:14:foo_mmap bar mmap baz
-		} >expected &&
+		cat >expected <<-EOF &&
+		${HC}file:5:foo mmap bar
+		${HC}file:14:foo_mmap bar mmap
+		${HC}file:5:foo mmap bar_mmap
+		${HC}file:14:foo_mmap bar mmap baz
+		EOF
 		git grep --column -w -e mmap $H >actual &&
 		test_cmp expected actual
 	'
 
 	test_expect_success "grep -w $L (with --column, extended OR)" '
-		{
-			echo ${HC}file:14:foo_mmap bar mmap
-			echo ${HC}file:19:foo_mmap bar mmap baz
-		} >expected &&
+		cat >expected <<-EOF &&
+		${HC}file:14:foo_mmap bar mmap
+		${HC}file:19:foo_mmap bar mmap baz
+		EOF
 		git grep --column -w -e mmap$ --or -e baz $H >actual &&
 		test_cmp expected actual
 	'
 
 	test_expect_success "grep -w $L (with --column, --invert-match)" '
-		{
-			echo ${HC}file:1:foo mmap bar
-			echo ${HC}file:1:foo_mmap bar
-			echo ${HC}file:1:foo_mmap bar mmap
-			echo ${HC}file:1:foo mmap bar_mmap
-		} >expected &&
+		cat >expected <<-EOF &&
+		${HC}file:1:foo mmap bar
+		${HC}file:1:foo_mmap bar
+		${HC}file:1:foo_mmap bar mmap
+		${HC}file:1:foo mmap bar_mmap
+		EOF
 		git grep --column --invert-match -w -e baz $H -- file >actual &&
 		test_cmp expected actual
 	'
 
 	test_expect_success "grep $L (with --column, --invert-match, extended OR)" '
-		{
-			echo ${HC}hello_world:6:HeLLo_world
-		} >expected &&
+		cat >expected <<-EOF &&
+		${HC}hello_world:6:HeLLo_world
+		EOF
 		git grep --column --invert-match -e ll --or --not -e _ $H -- hello_world \
 			>actual &&
 		test_cmp expected actual
 	'
 
 	test_expect_success "grep $L (with --column, --invert-match, extended AND)" '
-		{
-			echo ${HC}hello_world:3:Hello world
-			echo ${HC}hello_world:3:Hello_world
-			echo ${HC}hello_world:6:HeLLo_world
-		} >expected &&
+		cat >expected <<-EOF &&
+		${HC}hello_world:3:Hello world
+		${HC}hello_world:3:Hello_world
+		${HC}hello_world:6:HeLLo_world
+		EOF
 		git grep --column --invert-match --not -e _ --and --not -e ll $H -- hello_world \
 			>actual &&
 		test_cmp expected actual
 	'
 
 	test_expect_success "grep $L (with --column, double-negation)" '
-		{
-			echo ${HC}file:1:foo_mmap bar mmap baz
-		} >expected &&
+		cat >expected <<-EOF &&
+		${HC}file:1:foo_mmap bar mmap baz
+		EOF
 		git grep --column --not \( --not -e foo --or --not -e baz \) $H -- file \
 			>actual &&
 		test_cmp expected actual
 	'
 
 	test_expect_success "grep -w $L (with --column, -C)" '
-		{
-			echo ${HC}file:5:foo mmap bar
-			echo ${HC}file-foo_mmap bar
-			echo ${HC}file:14:foo_mmap bar mmap
-			echo ${HC}file:5:foo mmap bar_mmap
-			echo ${HC}file:14:foo_mmap bar mmap baz
-		} >expected &&
+		cat >expected <<-EOF &&
+		${HC}file:5:foo mmap bar
+		${HC}file-foo_mmap bar
+		${HC}file:14:foo_mmap bar mmap
+		${HC}file:5:foo mmap bar_mmap
+		${HC}file:14:foo_mmap bar mmap baz
+		EOF
 		git grep --column -w -C1 -e mmap $H >actual &&
 		test_cmp expected actual
 	'
 
 	test_expect_success "grep -w $L (with --line-number, --column)" '
-		{
-			echo ${HC}file:1:5:foo mmap bar
-			echo ${HC}file:3:14:foo_mmap bar mmap
-			echo ${HC}file:4:5:foo mmap bar_mmap
-			echo ${HC}file:5:14:foo_mmap bar mmap baz
-		} >expected &&
+		cat >expected <<-EOF &&
+		${HC}file:1:5:foo mmap bar
+		${HC}file:3:14:foo_mmap bar mmap
+		${HC}file:4:5:foo mmap bar_mmap
+		${HC}file:5:14:foo_mmap bar mmap baz
+		EOF
 		git grep -n --column -w -e mmap $H >actual &&
 		test_cmp expected actual
 	'
 
 	test_expect_success "grep -w $L (with non-extended patterns, --column)" '
-		{
-			echo ${HC}file:5:foo mmap bar
-			echo ${HC}file:10:foo_mmap bar
-			echo ${HC}file:10:foo_mmap bar mmap
-			echo ${HC}file:5:foo mmap bar_mmap
-			echo ${HC}file:10:foo_mmap bar mmap baz
-		} >expected &&
+		cat >expected <<-EOF &&
+		${HC}file:5:foo mmap bar
+		${HC}file:10:foo_mmap bar
+		${HC}file:10:foo_mmap bar mmap
+		${HC}file:5:foo mmap bar_mmap
+		${HC}file:10:foo_mmap bar mmap baz
+		EOF
 		git grep --column -w -e bar -e mmap $H >actual &&
 		test_cmp expected actual
 	'
 
 	test_expect_success "grep -w $L" '
-		{
-			echo ${HC}file:1:foo mmap bar
-			echo ${HC}file:3:foo_mmap bar mmap
-			echo ${HC}file:4:foo mmap bar_mmap
-			echo ${HC}file:5:foo_mmap bar mmap baz
-		} >expected &&
+		cat >expected <<-EOF &&
+		${HC}file:1:foo mmap bar
+		${HC}file:3:foo_mmap bar mmap
+		${HC}file:4:foo mmap bar_mmap
+		${HC}file:5:foo_mmap bar mmap baz
+		EOF
 		git -c grep.linenumber=true grep -w -e mmap $H >actual &&
 		test_cmp expected actual
 	'
 
 	test_expect_success "grep -w $L" '
-		{
-			echo ${HC}file:foo mmap bar
-			echo ${HC}file:foo_mmap bar mmap
-			echo ${HC}file:foo mmap bar_mmap
-			echo ${HC}file:foo_mmap bar mmap baz
-		} >expected &&
+		cat >expected <<-EOF &&
+		${HC}file:foo mmap bar
+		${HC}file:foo_mmap bar mmap
+		${HC}file:foo mmap bar_mmap
+		${HC}file:foo_mmap bar mmap baz
+		EOF
 		git -c grep.linenumber=true grep --no-line-number -w -e mmap $H >actual &&
 		test_cmp expected actual
 	'
@@ -227,17 +278,17 @@ do
 	'
 
 	test_expect_success "grep -w $L (x)" '
-		{
-			echo ${HC}x:1:x x xx x
-		} >expected &&
+		cat >expected <<-EOF &&
+		${HC}x:1:x x xx x
+		EOF
 		git grep -n -w -e "x xx* x" $H >actual &&
 		test_cmp expected actual
 	'
 
 	test_expect_success "grep -w $L (y-1)" '
-		{
-			echo ${HC}y:1:y yy
-		} >expected &&
+		cat >expected <<-EOF &&
+		${HC}y:1:y yy
+		EOF
 		git grep -n -w -e "^y" $H >actual &&
 		test_cmp expected actual
 	'
@@ -265,16 +316,16 @@ do
 	'
 
 	test_expect_success "grep $L (with --column, --only-matching)" '
-		{
-			echo ${HC}file:1:5:mmap
-			echo ${HC}file:2:5:mmap
-			echo ${HC}file:3:5:mmap
-			echo ${HC}file:3:13:mmap
-			echo ${HC}file:4:5:mmap
-			echo ${HC}file:4:13:mmap
-			echo ${HC}file:5:5:mmap
-			echo ${HC}file:5:13:mmap
-		} >expected &&
+		cat >expected <<-EOF &&
+		${HC}file:1:5:mmap
+		${HC}file:2:5:mmap
+		${HC}file:3:5:mmap
+		${HC}file:3:13:mmap
+		${HC}file:4:5:mmap
+		${HC}file:4:13:mmap
+		${HC}file:5:5:mmap
+		${HC}file:5:13:mmap
+		EOF
 		git grep --column -n -o -e mmap $H >actual &&
 		test_cmp expected actual
 	'
@@ -308,11 +359,11 @@ do
 	'
 
 	test_expect_success "grep --max-depth -1 $L" '
-		{
-			echo ${HC}t/a/v:1:vvv
-			echo ${HC}t/v:1:vvv
-			echo ${HC}v:1:vvv
-		} >expected &&
+		cat >expected <<-EOF &&
+		${HC}t/a/v:1:vvv
+		${HC}t/v:1:vvv
+		${HC}v:1:vvv
+		EOF
 		git grep --max-depth -1 -n -e vvv $H >actual &&
 		test_cmp expected actual &&
 		git grep --recursive -n -e vvv $H >actual &&
@@ -320,9 +371,9 @@ do
 	'
 
 	test_expect_success "grep --max-depth 0 $L" '
-		{
-			echo ${HC}v:1:vvv
-		} >expected &&
+		cat >expected <<-EOF &&
+		${HC}v:1:vvv
+		EOF
 		git grep --max-depth 0 -n -e vvv $H >actual &&
 		test_cmp expected actual &&
 		git grep --no-recursive -n -e vvv $H >actual &&
@@ -330,11 +381,11 @@ do
 	'
 
 	test_expect_success "grep --max-depth 0 -- '*' $L" '
-		{
-			echo ${HC}t/a/v:1:vvv
-			echo ${HC}t/v:1:vvv
-			echo ${HC}v:1:vvv
-		} >expected &&
+		cat >expected <<-EOF &&
+		${HC}t/a/v:1:vvv
+		${HC}t/v:1:vvv
+		${HC}v:1:vvv
+		EOF
 		git grep --max-depth 0 -n -e vvv $H -- "*" >actual &&
 		test_cmp expected actual &&
 		git grep --no-recursive -n -e vvv $H -- "*" >actual &&
@@ -342,18 +393,18 @@ do
 	'
 
 	test_expect_success "grep --max-depth 1 $L" '
-		{
-			echo ${HC}t/v:1:vvv
-			echo ${HC}v:1:vvv
-		} >expected &&
+		cat >expected <<-EOF &&
+		${HC}t/v:1:vvv
+		${HC}v:1:vvv
+		EOF
 		git grep --max-depth 1 -n -e vvv $H >actual &&
 		test_cmp expected actual
 	'
 
 	test_expect_success "grep --max-depth 0 -- t $L" '
-		{
-			echo ${HC}t/v:1:vvv
-		} >expected &&
+		cat >expected <<-EOF &&
+		${HC}t/v:1:vvv
+		EOF
 		git grep --max-depth 0 -n -e vvv $H -- t >actual &&
 		test_cmp expected actual &&
 		git grep --no-recursive -n -e vvv $H -- t >actual &&
@@ -361,10 +412,10 @@ do
 	'
 
 	test_expect_success "grep --max-depth 0 -- . t $L" '
-		{
-			echo ${HC}t/v:1:vvv
-			echo ${HC}v:1:vvv
-		} >expected &&
+		cat >expected <<-EOF &&
+		${HC}t/v:1:vvv
+		${HC}v:1:vvv
+		EOF
 		git grep --max-depth 0 -n -e vvv $H -- . t >actual &&
 		test_cmp expected actual &&
 		git grep --no-recursive -n -e vvv $H -- . t >actual &&
@@ -372,44 +423,22 @@ do
 	'
 
 	test_expect_success "grep --max-depth 0 -- t . $L" '
-		{
-			echo ${HC}t/v:1:vvv
-			echo ${HC}v:1:vvv
-		} >expected &&
+		cat >expected <<-EOF &&
+		${HC}t/v:1:vvv
+		${HC}v:1:vvv
+		EOF
 		git grep --max-depth 0 -n -e vvv $H -- t . >actual &&
 		test_cmp expected actual &&
 		git grep --no-recursive -n -e vvv $H -- t . >actual &&
 		test_cmp expected actual
 	'
-	test_expect_success "grep $L with grep.extendedRegexp=false" '
-		echo "${HC}ab:a+bc" >expected &&
-		git -c grep.extendedRegexp=false grep "a+b*c" $H ab >actual &&
-		test_cmp expected actual
-	'
-
-	test_expect_success "grep $L with grep.extendedRegexp=true" '
-		echo "${HC}ab:abc" >expected &&
-		git -c grep.extendedRegexp=true grep "a+b*c" $H ab >actual &&
-		test_cmp expected actual
-	'
-
-	test_expect_success "grep $L with grep.patterntype=basic" '
-		echo "${HC}ab:a+bc" >expected &&
-		git -c grep.patterntype=basic grep "a+b*c" $H ab >actual &&
-		test_cmp expected actual
-	'
 
-	test_expect_success "grep $L with grep.patterntype=extended" '
-		echo "${HC}ab:abc" >expected &&
-		git -c grep.patterntype=extended grep "a+b*c" $H ab >actual &&
-		test_cmp expected actual
-	'
 
-	test_expect_success "grep $L with grep.patterntype=fixed" '
-		echo "${HC}ab:a+b*c" >expected &&
-		git -c grep.patterntype=fixed grep "a+b*c" $H ab >actual &&
-		test_cmp expected actual
-	'
+	test_pattern_type "$H" "$HC" "$L" BRE -c grep.extendedRegexp=false
+	test_pattern_type "$H" "$HC" "$L" ERE -c grep.extendedRegexp=true
+	test_pattern_type "$H" "$HC" "$L" BRE -c grep.patternType=basic
+	test_pattern_type "$H" "$HC" "$L" ERE -c grep.patternType=extended
+	test_pattern_type "$H" "$HC" "$L" FIX -c grep.patternType=fixed
 
 	test_expect_success PCRE "grep $L with grep.patterntype=perl" '
 		echo "${HC}ab:a+b*c" >expected &&
@@ -421,59 +450,76 @@ do
 		test_must_fail git -c grep.patterntype=perl grep "foo.*bar"
 	'
 
-	test_expect_success "grep $L with grep.patternType=default and grep.extendedRegexp=true" '
-		echo "${HC}ab:abc" >expected &&
-		git \
-			-c grep.patternType=default \
-			-c grep.extendedRegexp=true \
-			grep "a+b*c" $H ab >actual &&
-		test_cmp expected actual
-	'
-
-	test_expect_success "grep $L with grep.extendedRegexp=true and grep.patternType=default" '
-		echo "${HC}ab:abc" >expected &&
-		git \
-			-c grep.extendedRegexp=true \
-			-c grep.patternType=default \
-			grep "a+b*c" $H ab >actual &&
-		test_cmp expected actual
-	'
-
-	test_expect_success "grep $L with grep.patternType=extended and grep.extendedRegexp=false" '
-		echo "${HC}ab:abc" >expected &&
-		git \
-			-c grep.patternType=extended \
-			-c grep.extendedRegexp=false \
-			grep "a+b*c" $H ab >actual &&
-		test_cmp expected actual
-	'
-
-	test_expect_success "grep $L with grep.patternType=basic and grep.extendedRegexp=true" '
-		echo "${HC}ab:a+bc" >expected &&
-		git \
-			-c grep.patternType=basic \
-			-c grep.extendedRegexp=true \
-			grep "a+b*c" $H ab >actual &&
-		test_cmp expected actual
-	'
-
-	test_expect_success "grep $L with grep.extendedRegexp=false and grep.patternType=extended" '
-		echo "${HC}ab:abc" >expected &&
-		git \
-			-c grep.extendedRegexp=false \
-			-c grep.patternType=extended \
-			grep "a+b*c" $H ab >actual &&
-		test_cmp expected actual
-	'
-
-	test_expect_success "grep $L with grep.extendedRegexp=true and grep.patternType=basic" '
-		echo "${HC}ab:a+bc" >expected &&
-		git \
-			-c grep.extendedRegexp=true \
-			-c grep.patternType=basic \
-			grep "a+b*c" $H ab >actual &&
-		test_cmp expected actual
-	'
+	test_pattern_type "$H" "$HC" "$L" ERE \
+		-c grep.patternType=default \
+		-c grep.extendedRegexp=true
+	test_pattern_type "$H" "$HC" "$L" ERE \
+		-c grep.extendedRegexp=true \
+		-c grep.patternType=default
+	test_pattern_type "$H" "$HC" "$L" ERE \
+		-c grep.patternType=extended \
+		-c grep.extendedRegexp=false
+	test_pattern_type "$H" "$HC" "$L" BRE \
+		-c grep.patternType=basic \
+		-c grep.extendedRegexp=true
+	test_pattern_type "$H" "$HC" "$L" ERE \
+		-c grep.extendedRegexp=false \
+		-c grep.patternType=extended
+	test_pattern_type "$H" "$HC" "$L" BRE \
+		-c grep.extendedRegexp=true \
+		-c grep.patternType=basic
+
+	# grep.extendedRegexp is last-one-wins
+	test_pattern_type "$H" "$HC" "$L" BRE \
+		-c grep.extendedRegexp=true \
+		-c grep.extendedRegexp=false
+
+	# grep.patternType=basic pays no attention to grep.extendedRegexp
+	test_pattern_type "$H" "$HC" "$L" BRE \
+		-c grep.extendedRegexp=true \
+		-c grep.patternType=basic \
+		-c grep.extendedRegexp=false
+
+	# grep.patternType=extended pays no attention to grep.extendedRegexp
+	test_pattern_type "$H" "$HC" "$L" ERE \
+		-c grep.extendedRegexp=true \
+		-c grep.patternType=extended \
+		-c grep.extendedRegexp=false
+
+	# grep.extendedRegexp is used with a last-one-wins grep.patternType=default
+	test_pattern_type "$H" "$HC" "$L" ERE \
+		-c grep.patternType=fixed \
+		-c grep.extendedRegexp=true \
+		-c grep.patternType=default
+
+	# grep.extendedRegexp is used with earlier grep.patternType=default
+	test_pattern_type "$H" "$HC" "$L" ERE \
+		-c grep.extendedRegexp=false \
+		-c grep.patternType=default \
+		-c grep.extendedRegexp=true
+
+	# grep.extendedRegexp is used with a last-one-loses grep.patternType=default
+	test_pattern_type "$H" "$HC" "$L" ERE \
+		-c grep.extendedRegexp=false \
+		-c grep.extendedRegexp=true \
+		-c grep.patternType=default
+
+	# grep.extendedRegexp and grep.patternType are both last-one-wins independently
+	test_pattern_type "$H" "$HC" "$L" BRE \
+		-c grep.patternType=default \
+		-c grep.extendedRegexp=true \
+		-c grep.patternType=basic
+
+	# grep.patternType=extended and grep.patternType=default
+	test_pattern_type "$H" "$HC" "$L" BRE \
+		-c grep.patternType=extended \
+		-c grep.patternType=default
+
+	# grep.patternType=[extended -> default -> fixed] (BRE)" '
+	test_pattern_type "$H" "$HC" "$L" FIX \
+		-c grep.patternType=extended \
+		-c grep.patternType=default \
+		-c grep.patternType=fixed
 
 	test_expect_success "grep --count $L" '
 		echo ${HC}ab:3 >expected &&
@@ -530,6 +576,14 @@ do
 	'
 done
 
+test_expect_success MB_REGEX 'grep exactly one char in single-char multibyte file' '
+	LC_ALL=en_US.UTF-8 git grep "^.$" reverse-question-mark
+'
+
+test_expect_success MB_REGEX 'grep two chars in single-char multibyte file' '
+	LC_ALL=en_US.UTF-8 test_expect_code 1 git grep ".." reverse-question-mark
+'
+
 cat >expected <<EOF
 file
 EOF
@@ -557,6 +611,92 @@ test_expect_success 'grep --files-without-match --quiet' '
 	test_must_be_empty actual
 '
 
+test_expect_success 'grep --max-count 0 (must exit with non-zero)' '
+	test_must_fail git grep --max-count 0 foo >actual &&
+	test_must_be_empty actual
+'
+
+test_expect_success 'grep --max-count 3' '
+	cat >expected <<-EOF &&
+	file:foo mmap bar
+	file:foo_mmap bar
+	file:foo_mmap bar mmap
+	EOF
+	git grep --max-count 3 foo >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'grep --max-count -1 (no limit)' '
+	cat >expected <<-EOF &&
+	file:foo mmap bar
+	file:foo_mmap bar
+	file:foo_mmap bar mmap
+	file:foo mmap bar_mmap
+	file:foo_mmap bar mmap baz
+	EOF
+	git grep --max-count -1 foo >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'grep --max-count 1 --context 2' '
+	cat >expected <<-EOF &&
+	file-foo mmap bar
+	file:foo_mmap bar
+	file-foo_mmap bar mmap
+	EOF
+	git grep --max-count 1 --context 1 foo_mmap >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'grep --max-count 1 --show-function' '
+	cat >expected <<-EOF &&
+	hello.ps1=function hello() {
+	hello.ps1:  echo "Hello world."
+	EOF
+	git grep --max-count 1 --show-function Hello hello.ps1 >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'grep --max-count 2 --show-function' '
+	cat >expected <<-EOF &&
+	hello.ps1=function hello() {
+	hello.ps1:  echo "Hello world."
+	hello.ps1:  echo "Hello again."
+	EOF
+	git grep --max-count 2 --show-function Hello hello.ps1 >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'grep --max-count 1 --count' '
+	cat >expected <<-EOF &&
+	hello.ps1:1
+	EOF
+	git grep --max-count 1 --count Hello hello.ps1 >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'grep --max-count 1 (multiple files)' '
+	cat >expected <<-EOF &&
+	hello.c:#include <stdio.h>
+	hello.ps1:# No-op.
+	EOF
+	git grep --max-count 1 -e o -- hello.\* >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success 'grep --max-count 1 --context 1 (multiple files)' '
+	cat >expected <<-EOF &&
+	hello.c-#include <assert.h>
+	hello.c:#include <stdio.h>
+	hello.c-
+	--
+	hello.ps1:# No-op.
+	hello.ps1-function dummy() {}
+	EOF
+	git grep --max-count 1 --context 1 -e o -- hello.\* >actual &&
+	test_cmp expected actual
+'
+
 cat >expected <<EOF
 file:foo mmap bar_mmap
 EOF
@@ -668,6 +808,19 @@ test_expect_success 'grep -f, ignore empty lines, read patterns from stdin' '
 	test_cmp expected actual
 '
 
+test_expect_success 'grep -f, use cwd relative file' '
+	test_when_finished "git rm -f sub/dir/file" &&
+	mkdir -p sub/dir &&
+	echo hit >sub/dir/file &&
+	git add sub/dir/file &&
+	echo hit >sub/dir/pattern &&
+	echo miss >pattern &&
+	(
+		cd sub/dir && git grep -f pattern file
+	) &&
+	git -C sub/dir grep -f pattern file
+'
+
 cat >expected <<EOF
 y:y yy
 --
@@ -687,21 +840,9 @@ test_expect_success 'grep -C1 hunk mark between files' '
 '
 
 test_expect_success 'log grep setup' '
-	echo a >>file &&
-	test_tick &&
-	GIT_AUTHOR_NAME="With * Asterisk" \
-	GIT_AUTHOR_EMAIL="xyzzy@frotz.com" \
-	git commit -a -m "second" &&
-
-	echo a >>file &&
-	test_tick &&
-	git commit -a -m "third" &&
-
-	echo a >>file &&
-	test_tick &&
-	GIT_AUTHOR_NAME="Night Fall" \
-	GIT_AUTHOR_EMAIL="nitfol@frobozz.com" \
-	git commit -a -m "fourth"
+	test_commit --append --author "With * Asterisk <xyzzy@frotz.com>" second file a &&
+	test_commit --append third file a &&
+	test_commit --append --author "Night Fall <nitfol@frobozz.com>" fourth file a
 '
 
 test_expect_success 'log grep (1)' '
@@ -873,7 +1014,9 @@ test_expect_success 'log --committer does not search in timestamp' '
 test_expect_success 'grep with CE_VALID file' '
 	git update-index --assume-unchanged t/t &&
 	rm t/t &&
-	test "$(git grep test)" = "t/t:test" &&
+	echo "t/t:test" >expect &&
+	git grep test >actual &&
+	test_cmp expect actual &&
 	git update-index --no-assume-unchanged t/t &&
 	git checkout t/t
 '
@@ -978,7 +1121,8 @@ do
 	"
 done
 
-test_expect_success !PTHREADS,C_LOCALE_OUTPUT 'grep --threads=N or pack.threads=N warns when no pthreads' '
+test_expect_success !PTHREADS,!FAIL_PREREQS \
+	'grep --threads=N or pack.threads=N warns when no pthreads' '
 	git grep --threads=2 Hello hello_world 2>err &&
 	grep ^warning: err >warnings &&
 	test_line_count = 1 warnings &&
@@ -1103,6 +1247,33 @@ test_expect_success 'outside of git repository with fallbackToNoIndex' '
 	)
 '
 
+test_expect_success 'no repository with path outside $cwd' '
+	test_when_finished rm -fr non &&
+	rm -fr non &&
+	mkdir -p non/git/sub non/tig &&
+	(
+		GIT_CEILING_DIRECTORIES="$(pwd)/non" &&
+		export GIT_CEILING_DIRECTORIES &&
+		cd non/git &&
+		test_expect_code 128 git grep --no-index search .. 2>error &&
+		grep "is outside the directory tree" error
+	) &&
+	(
+		GIT_CEILING_DIRECTORIES="$(pwd)/non" &&
+		export GIT_CEILING_DIRECTORIES &&
+		cd non/git &&
+		test_expect_code 128 git grep --no-index search ../tig 2>error &&
+		grep "is outside the directory tree" error
+	) &&
+	(
+		GIT_CEILING_DIRECTORIES="$(pwd)/non" &&
+		export GIT_CEILING_DIRECTORIES &&
+		cd non/git &&
+		test_expect_code 128 git grep --no-index search ../non 2>error &&
+		grep "no such path in the working tree" error
+	)
+'
+
 test_expect_success 'inside git repository but with --no-index' '
 	rm -fr is &&
 	mkdir -p is/git/sub &&
@@ -1206,19 +1377,19 @@ test_expect_success 'grep -e -- -- path' '
 '
 
 test_expect_success 'dashdash disambiguates rev as rev' '
-	test_when_finished "rm -f master" &&
-	echo content >master &&
-	echo master:hello.c >expect &&
-	git grep -l o master -- hello.c >actual &&
+	test_when_finished "rm -f main" &&
+	echo content >main &&
+	echo main:hello.c >expect &&
+	git grep -l o main -- hello.c >actual &&
 	test_cmp expect actual
 '
 
 test_expect_success 'dashdash disambiguates pathspec as pathspec' '
-	test_when_finished "git rm -f master" &&
-	echo content >master &&
-	git add master &&
-	echo master:content >expect &&
-	git grep o -- master >actual &&
+	test_when_finished "git rm -f main" &&
+	echo content >main &&
+	git add main &&
+	echo main:content >expect &&
+	git grep o -- main >actual &&
 	test_cmp expect actual
 '
 
@@ -1254,21 +1425,21 @@ test_expect_success 'grep --no-index pattern -- path' '
 '
 
 test_expect_success 'grep --no-index complains of revs' '
-	test_must_fail git grep --no-index o master -- 2>err &&
-	test_i18ngrep "cannot be used with revs" err
+	test_must_fail git grep --no-index o main -- 2>err &&
+	test_grep "cannot be used with revs" err
 '
 
 test_expect_success 'grep --no-index prefers paths to revs' '
-	test_when_finished "rm -f master" &&
-	echo content >master &&
-	echo master:content >expect &&
-	git grep --no-index o master >actual &&
+	test_when_finished "rm -f main" &&
+	echo content >main &&
+	echo main:content >expect &&
+	git grep --no-index o main >actual &&
 	test_cmp expect actual
 '
 
 test_expect_success 'grep --no-index does not "diagnose" revs' '
 	test_must_fail git grep --no-index o :1:hello.c 2>err &&
-	test_i18ngrep ! -i "did you mean" err
+	test_grep ! -i "did you mean" err
 '
 
 cat >expected <<EOF
@@ -1313,10 +1484,10 @@ test_expect_success PCRE 'grep -P pattern with grep.extendedRegexp=true' '
 '
 
 test_expect_success PCRE 'grep -P -v pattern' '
-	{
-		echo "ab:a+b*c"
-		echo "ab:a+bc"
-	} >expected &&
+	cat >expected <<-\EOF &&
+	ab:a+b*c
+	ab:a+bc
+	EOF
 	git grep -P -v "abc" ab >actual &&
 	test_cmp expected actual
 '
@@ -1330,10 +1501,10 @@ test_expect_success PCRE 'grep -P -i pattern' '
 '
 
 test_expect_success PCRE 'grep -P -w pattern' '
-	{
-		echo "hello_world:Hello world"
-		echo "hello_world:HeLLo world"
-	} >expected &&
+	cat >expected <<-\EOF &&
+	hello_world:Hello world
+	hello_world:HeLLo world
+	EOF
 	git grep -P -w "He((?i)ll)o" hello_world >actual &&
 	test_cmp expected actual
 '
@@ -1468,10 +1639,10 @@ test_expect_success 'grep -F pattern with grep.patternType=basic' '
 '
 
 test_expect_success 'grep -G pattern with grep.patternType=fixed' '
-	{
-		echo "ab:a+b*c"
-		echo "ab:a+bc"
-	} >expected &&
+	cat >expected <<-\EOF &&
+	ab:a+b*c
+	ab:a+bc
+	EOF
 	git \
 		-c grep.patterntype=fixed \
 		grep -G "a+b" ab >actual &&
@@ -1479,11 +1650,11 @@ test_expect_success 'grep -G pattern with grep.patternType=fixed' '
 '
 
 test_expect_success 'grep -E pattern with grep.patternType=fixed' '
-	{
-		echo "ab:a+b*c"
-		echo "ab:a+bc"
-		echo "ab:abc"
-	} >expected &&
+	cat >expected <<-\EOF &&
+	ab:a+b*c
+	ab:a+bc
+	ab:abc
+	EOF
 	git \
 		-c grep.patterntype=fixed \
 		grep -E "a+" ab >actual &&
diff --git a/t/t7811-grep-open.sh b/t/t7811-grep-open.sh
index a98785d..fe38d88 100755
--- a/t/t7811-grep-open.sh
+++ b/t/t7811-grep-open.sh
@@ -3,6 +3,7 @@
 test_description='git grep --open-files-in-pager
 '
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-pager.sh
 unset PAGER GIT_PAGER
@@ -62,7 +63,7 @@ test_expect_success SIMPLEPAGER 'git grep -O' '
 
 test_expect_success 'git grep -O --cached' '
 	test_must_fail git grep --cached -O GREP_PATTERN >out 2>msg &&
-	test_i18ngrep open-files-in-pager msg
+	test_grep open-files-in-pager msg
 '
 
 test_expect_success 'git grep -O --no-index' '
@@ -114,8 +115,8 @@ test_expect_success 'modified file' '
 	unrelated
 	EOF
 
+	test_when_finished "git reset --hard" &&
 	echo "enum grep_pat_token" >unrelated &&
-	test_when_finished "git checkout HEAD unrelated" &&
 	GIT_PAGER=./less git grep -F -O "enum grep_pat_token" >out &&
 	test_cmp expect actual &&
 	test_must_be_empty out
diff --git a/t/t7812-grep-icase-non-ascii.sh b/t/t7812-grep-icase-non-ascii.sh
index 03dba66..31c66b6 100755
--- a/t/t7812-grep-icase-non-ascii.sh
+++ b/t/t7812-grep-icase-non-ascii.sh
@@ -2,8 +2,13 @@
 
 test_description='grep icase on non-English locales'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./lib-gettext.sh
 
+doalarm () {
+	perl -e 'alarm shift; exec @ARGV' -- "$@"
+}
+
 test_expect_success GETTEXT_LOCALE 'setup' '
 	test_write_lines "TILRAUN: Halló Heimur!" >file &&
 	git add file &&
@@ -11,9 +16,19 @@ test_expect_success GETTEXT_LOCALE 'setup' '
 	export LC_ALL
 '
 
-test_have_prereq GETTEXT_LOCALE &&
-test-tool regex "HALLÓ" "Halló" ICASE &&
-test_set_prereq REGEX_LOCALE
+test_expect_success GETTEXT_LOCALE 'setup REGEX_LOCALE prerequisite' '
+	# This "test-tool" invocation is identical...
+	if test-tool regex "HALLÓ" "Halló" ICASE
+	then
+		test_set_prereq REGEX_LOCALE
+	else
+
+		# ... to this one, but this way "test_must_fail" will
+		# tell a segfault or abort() from the regexec() test
+		# itself
+		test_must_fail test-tool regex "HALLÓ" "Halló" ICASE
+	fi
+'
 
 test_expect_success REGEX_LOCALE 'grep literal string, no -F' '
 	git grep -i "TILRAUN: Halló Heimur!" &&
@@ -57,7 +72,12 @@ test_expect_success GETTEXT_LOCALE,LIBPCRE2 'PCRE v2: setup invalid UTF-8 data'
 	printf "\\200\\n" >invalid-0x80 &&
 	echo "ævar" >expected &&
 	cat expected >>invalid-0x80 &&
-	git add invalid-0x80
+	git add invalid-0x80 &&
+
+	# Test for PCRE2_MATCH_INVALID_UTF bug
+	# https://bugs.exim.org/show_bug.cgi?id=2642
+	printf "\\345Aæ\\n" >invalid-0xe5 &&
+	git add invalid-0xe5
 '
 
 test_expect_success GETTEXT_LOCALE,LIBPCRE2 'PCRE v2: grep ASCII from invalid UTF-8 data' '
@@ -67,6 +87,13 @@ test_expect_success GETTEXT_LOCALE,LIBPCRE2 'PCRE v2: grep ASCII from invalid UT
 	test_cmp expected actual
 '
 
+test_expect_success GETTEXT_LOCALE,LIBPCRE2 'PCRE v2: grep ASCII from invalid UTF-8 data (PCRE2 bug #2642)' '
+	git grep -h "Aæ" invalid-0xe5 >actual &&
+	test_cmp invalid-0xe5 actual &&
+	git grep -h "(*NO_JIT)Aæ" invalid-0xe5 >actual &&
+	test_cmp invalid-0xe5 actual
+'
+
 test_expect_success GETTEXT_LOCALE,LIBPCRE2 'PCRE v2: grep non-ASCII from invalid UTF-8 data' '
 	git grep -h "æ" invalid-0x80 >actual &&
 	test_cmp expected actual &&
@@ -74,14 +101,53 @@ test_expect_success GETTEXT_LOCALE,LIBPCRE2 'PCRE v2: grep non-ASCII from invali
 	test_cmp expected actual
 '
 
+test_expect_success GETTEXT_LOCALE,LIBPCRE2 'PCRE v2: grep non-ASCII from invalid UTF-8 data (PCRE2 bug #2642)' '
+	git grep -h "Aæ" invalid-0xe5 >actual &&
+	test_cmp invalid-0xe5 actual &&
+	git grep -h "(*NO_JIT)Aæ" invalid-0xe5 >actual &&
+	test_cmp invalid-0xe5 actual
+'
+
+test_lazy_prereq PCRE2_MATCH_INVALID_UTF '
+	test-tool pcre2-config has-PCRE2_MATCH_INVALID_UTF
+'
+
 test_expect_success GETTEXT_LOCALE,LIBPCRE2 'PCRE v2: grep non-ASCII from invalid UTF-8 data with -i' '
 	test_might_fail git grep -hi "Æ" invalid-0x80 >actual &&
-	if test -s actual
-	then
-	    test_cmp expected actual
-	fi &&
-	test_must_fail git grep -hi "(*NO_JIT)Æ" invalid-0x80 >actual &&
-	! test_cmp expected actual
+	test_might_fail git grep -hi "(*NO_JIT)Æ" invalid-0x80 >actual
+'
+
+test_expect_success GETTEXT_LOCALE,LIBPCRE2,PCRE2_MATCH_INVALID_UTF 'PCRE v2: grep non-ASCII from invalid UTF-8 data with -i' '
+	git grep -hi "Æ" invalid-0x80 >actual &&
+	test_cmp expected actual &&
+	git grep -hi "(*NO_JIT)Æ" invalid-0x80 >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success GETTEXT_LOCALE,LIBPCRE2,PCRE2_MATCH_INVALID_UTF 'PCRE v2: grep non-ASCII from invalid UTF-8 data with -i (PCRE2 bug #2642)' '
+	git grep -hi "Æ" invalid-0xe5 >actual &&
+	test_cmp invalid-0xe5 actual &&
+	git grep -hi "(*NO_JIT)Æ" invalid-0xe5 >actual &&
+	test_cmp invalid-0xe5 actual &&
+
+	# Only the case of grepping the ASCII part in a way that
+	# relies on -i fails
+	git grep -hi "aÆ" invalid-0xe5 >actual &&
+	test_cmp invalid-0xe5 actual &&
+	git grep -hi "(*NO_JIT)aÆ" invalid-0xe5 >actual &&
+	test_cmp invalid-0xe5 actual
+'
+
+test_expect_success GETTEXT_LOCALE,LIBPCRE2 'PCRE v2: grep non-literal ASCII from UTF-8' '
+	git grep --perl-regexp -h -o -e ll. file >actual &&
+	echo "lló" >expected &&
+	test_cmp expected actual
+'
+
+test_expect_success GETTEXT_LOCALE,LIBPCRE2 'PCRE v2: grep avoid endless loop bug' '
+	echo " Halló" >leading-whitespace &&
+	git add leading-whitespace &&
+	doalarm 1 git grep --perl-regexp "^\s" leading-whitespace
 '
 
 test_done
diff --git a/t/t7813-grep-icase-iso.sh b/t/t7813-grep-icase-iso.sh
index 701e08a..1227885 100755
--- a/t/t7813-grep-icase-iso.sh
+++ b/t/t7813-grep-icase-iso.sh
@@ -2,6 +2,7 @@
 
 test_description='grep icase on non-English locales'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./lib-gettext.sh
 
 test_expect_success GETTEXT_ISO_LOCALE 'setup' '
diff --git a/t/t7814-grep-recurse-submodules.sh b/t/t7814-grep-recurse-submodules.sh
index 828cb3b..167fe66 100755
--- a/t/t7814-grep-recurse-submodules.sh
+++ b/t/t7814-grep-recurse-submodules.sh
@@ -6,8 +6,12 @@ This test verifies the recurse-submodules feature correctly greps across
 submodules.
 '
 
+TEST_CREATE_REPO_NO_TEMPLATE=1
 . ./test-lib.sh
 
+GIT_TEST_FATAL_REGISTER_SUBMODULE_ODB=1
+export GIT_TEST_FATAL_REGISTER_SUBMODULE_ODB
+
 test_expect_success 'setup directory structure and submodule' '
 	echo "(1|2)d(3|4)" >a &&
 	mkdir b &&
@@ -193,6 +197,7 @@ test_expect_success !MINGW 'grep recurse submodule colon in name' '
 	git -C "su:b" commit -m "add fi:le" &&
 	test_tick &&
 
+	test_config_global protocol.file.allow always &&
 	git -C parent submodule add "../su:b" "su:b" &&
 	git -C parent commit -m "add submodule" &&
 	test_tick &&
@@ -227,6 +232,7 @@ test_expect_success 'grep history with moved submoules' '
 	git -C sub commit -m "add file" &&
 	test_tick &&
 
+	test_config_global protocol.file.allow always &&
 	git -C parent submodule add ../sub dir/sub &&
 	git -C parent commit -m "add submodule" &&
 	test_tick &&
@@ -271,6 +277,7 @@ test_expect_success 'grep using relative path' '
 	mkdir parent/src &&
 	echo "(1|2)d(3|4)" >parent/src/file2 &&
 	git -C parent add src/file2 &&
+	test_config_global protocol.file.allow always &&
 	git -C parent submodule add ../sub &&
 	git -C parent commit -m "add files and submodule" &&
 	test_tick &&
@@ -313,6 +320,7 @@ test_expect_success 'grep from a subdir' '
 	mkdir parent/src &&
 	echo "(1|2)d(3|4)" >parent/src/file &&
 	git -C parent add src/file &&
+	test_config_global protocol.file.allow always &&
 	git -C parent submodule add ../sub src/sub &&
 	git -C parent submodule add ../sub sub &&
 	git -C parent commit -m "add files and submodules" &&
@@ -340,7 +348,7 @@ test_incompatible_with_recurse_submodules ()
 {
 	test_expect_success "--recurse-submodules and $1 are incompatible" "
 		test_must_fail git grep -e. --recurse-submodules $1 2>actual &&
-		test_i18ngrep 'not supported with --recurse-submodules' actual
+		test_grep 'not supported with --recurse-submodules' actual
 	"
 }
 
@@ -438,4 +446,192 @@ test_expect_success 'grep --recurse-submodules with --cached ignores worktree mo
 	test_must_fail git grep --recurse-submodules --cached "A modified line in submodule" >actual 2>&1 &&
 	test_must_be_empty actual
 '
+
+test_expect_failure 'grep --textconv: superproject .gitattributes does not affect submodules' '
+	reset_and_clean &&
+	test_config_global diff.d2x.textconv "sed -e \"s/d/x/\"" &&
+	echo "a diff=d2x" >.gitattributes &&
+
+	cat >expect <<-\EOF &&
+	a:(1|2)x(3|4)
+	EOF
+	git grep --textconv --recurse-submodules x >actual &&
+	test_cmp expect actual
+'
+
+test_expect_failure 'grep --textconv: superproject .gitattributes (from index) does not affect submodules' '
+	reset_and_clean &&
+	test_config_global diff.d2x.textconv "sed -e \"s/d/x/\"" &&
+	echo "a diff=d2x" >.gitattributes &&
+	git add .gitattributes &&
+	rm .gitattributes &&
+
+	cat >expect <<-\EOF &&
+	a:(1|2)x(3|4)
+	EOF
+	git grep --textconv --recurse-submodules x >actual &&
+	test_cmp expect actual
+'
+
+test_expect_failure 'grep --textconv: superproject .git/info/attributes does not affect submodules' '
+	reset_and_clean &&
+	test_config_global diff.d2x.textconv "sed -e \"s/d/x/\"" &&
+	super_info="$(git rev-parse --git-path info)" &&
+	super_attr="$super_info/attributes" &&
+	test_when_finished "rm -f \"$super_attr\"" &&
+	mkdir "$super_info" &&
+	echo "a diff=d2x" >"$super_attr" &&
+
+	cat >expect <<-\EOF &&
+	a:(1|2)x(3|4)
+	EOF
+	git grep --textconv --recurse-submodules x >actual &&
+	test_cmp expect actual
+'
+
+# Note: what currently prevents this test from passing is not that the
+# .gitattributes file from "./submodule" is being ignored, but that it is being
+# propagated to the nested "./submodule/sub" files.
+#
+test_expect_failure 'grep --textconv correctly reads submodule .gitattributes' '
+	reset_and_clean &&
+	test_config_global diff.d2x.textconv "sed -e \"s/d/x/\"" &&
+	echo "a diff=d2x" >submodule/.gitattributes &&
+
+	cat >expect <<-\EOF &&
+	submodule/a:(1|2)x(3|4)
+	EOF
+	git grep --textconv --recurse-submodules x >actual &&
+	test_cmp expect actual
+'
+
+test_expect_failure 'grep --textconv correctly reads submodule .gitattributes (from index)' '
+	reset_and_clean &&
+	test_config_global diff.d2x.textconv "sed -e \"s/d/x/\"" &&
+	echo "a diff=d2x" >submodule/.gitattributes &&
+	git -C submodule add .gitattributes &&
+	rm submodule/.gitattributes &&
+
+	cat >expect <<-\EOF &&
+	submodule/a:(1|2)x(3|4)
+	EOF
+	git grep --textconv --recurse-submodules x >actual &&
+	test_cmp expect actual
+'
+
+test_expect_failure 'grep --textconv correctly reads submodule .git/info/attributes' '
+	reset_and_clean &&
+	test_config_global diff.d2x.textconv "sed -e \"s/d/x/\"" &&
+
+	submodule_info="$(git -C submodule rev-parse --path-format=absolute --git-path info)" &&
+	submodule_attr="$submodule_info/attributes" &&
+	test_when_finished "rm -f \"$submodule_attr\"" &&
+	echo "a diff=d2x" >"$submodule_attr" &&
+
+	cat >expect <<-\EOF &&
+	submodule/a:(1|2)x(3|4)
+	EOF
+	git grep --textconv --recurse-submodules x >actual &&
+	test_cmp expect actual
+'
+
+test_expect_failure 'grep saves textconv cache in the appropriate repository' '
+	reset_and_clean &&
+	test_config_global diff.d2x_cached.textconv "sed -e \"s/d/x/\"" &&
+	test_config_global diff.d2x_cached.cachetextconv true &&
+	echo "a diff=d2x_cached" >submodule/.gitattributes &&
+
+	# We only read/write to the textconv cache when grepping from an OID,
+	# as the working tree file might have modifications.
+	git grep --textconv --cached --recurse-submodules x &&
+
+	super_textconv_cache="$(git rev-parse --git-path refs/notes/textconv/d2x_cached)" &&
+	sub_textconv_cache="$(git -C submodule rev-parse \
+			--path-format=absolute --git-path refs/notes/textconv/d2x_cached)" &&
+	test_path_is_missing "$super_textconv_cache" &&
+	test_path_is_file "$sub_textconv_cache"
+'
+
+test_expect_success 'grep partially-cloned submodule' '
+	# Set up clean superproject and submodule for partial cloning.
+	test_config_global protocol.file.allow always &&
+	git init super &&
+	git init super/sub &&
+	(
+		cd super &&
+		test_commit --no-tag "Add file in superproject" \
+			super-file "Some content for super-file" &&
+		test_commit -C sub --no-tag "Add file in submodule" \
+			sub-file "Some content for sub-file" &&
+		git submodule add ./sub &&
+		git commit -m "Add other as submodule sub" &&
+		test_tick &&
+		test_commit -C sub --no-tag --append "Update file in submodule" \
+			sub-file "Some more content for sub-file" &&
+		git add sub &&
+		git commit -m "Update submodule" &&
+		test_tick &&
+		git config --local uploadpack.allowfilter 1 &&
+		git config --local uploadpack.allowanysha1inwant 1 &&
+		git -C sub config --local uploadpack.allowfilter 1 &&
+		git -C sub config --local uploadpack.allowanysha1inwant 1
+	) &&
+	# Clone the superproject & submodule, then make sure we can lazy-fetch submodule objects.
+	git clone --filter=blob:none --also-filter-submodules \
+		--recurse-submodules "file://$(pwd)/super" partial &&
+	(
+		cd partial &&
+		cat >expect <<-\EOF &&
+		HEAD^:sub/sub-file:Some content for sub-file
+		HEAD^:super-file:Some content for super-file
+		EOF
+
+		GIT_TRACE2_EVENT="$(pwd)/trace2.log" git grep -e content \
+			--recurse-submodules HEAD^ >actual &&
+		test_cmp expect actual &&
+		# Verify that we actually fetched data from the promisor remote:
+		grep \"category\":\"promisor\",\"key\":\"fetch_count\",\"value\":\"1\" trace2.log
+	)
+'
+
+test_expect_success 'check scope of core.useReplaceRefs' '
+	git init base &&
+	git init base/sub &&
+
+	echo A >base/a &&
+	echo B >base/b &&
+	echo C >base/sub/c &&
+	echo D >base/sub/d &&
+
+	git -C base/sub add c d &&
+	git -C base/sub commit -m "Add files" &&
+
+	git -C base submodule add ./sub &&
+	git -C base add a b sub &&
+	git -C base commit -m "Add files and submodule" &&
+
+	A=$(git -C base rev-parse HEAD:a) &&
+	B=$(git -C base rev-parse HEAD:b) &&
+	C=$(git -C base/sub rev-parse HEAD:c) &&
+	D=$(git -C base/sub rev-parse HEAD:d) &&
+
+	git -C base replace $A $B &&
+	git -C base/sub replace $C $D &&
+
+	test_must_fail git -C base grep --cached --recurse-submodules A &&
+	test_must_fail git -C base grep --cached --recurse-submodules C &&
+
+	git -C base config core.useReplaceRefs false &&
+	git -C base grep --recurse-submodules A &&
+	test_must_fail git -C base grep --cached --recurse-submodules C &&
+
+	git -C base/sub config core.useReplaceRefs false &&
+	git -C base grep --cached --recurse-submodules A &&
+	git -C base grep --cached --recurse-submodules C &&
+
+	git -C base config --unset core.useReplaceRefs &&
+	test_must_fail git -C base grep --cached --recurse-submodules A &&
+	git -C base grep --cached --recurse-submodules C
+'
+
 test_done
diff --git a/t/t7815-grep-binary.sh b/t/t7815-grep-binary.sh
index 90ebb64..ac87128 100755
--- a/t/t7815-grep-binary.sh
+++ b/t/t7815-grep-binary.sh
@@ -2,6 +2,7 @@
 
 test_description='git grep in binary files'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' "
diff --git a/t/t7816-grep-binary-pattern.sh b/t/t7816-grep-binary-pattern.sh
index 60bab29..4353be5 100755
--- a/t/t7816-grep-binary-pattern.sh
+++ b/t/t7816-grep-binary-pattern.sh
@@ -2,6 +2,7 @@
 
 test_description='git grep with a binary pattern files'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./lib-gettext.sh
 
 nul_match_internal () {
@@ -25,7 +26,7 @@ nul_match_internal () {
 			>stderr &&
 			printf '$pattern' | q_to_nul >f &&
 			test_must_fail env LC_ALL=\"$lc_all\" git grep $extra_flags -f f $flags a 2>stderr &&
-			test_i18ngrep ! 'This is only supported with -P under PCRE v2' stderr
+			test_grep ! 'This is only supported with -P under PCRE v2' stderr
 		"
 	elif test "$matches" = P
 	then
@@ -33,7 +34,7 @@ nul_match_internal () {
 			>stderr &&
 			printf '$pattern' | q_to_nul >f &&
 			test_must_fail env LC_ALL=\"$lc_all\" git grep -f f $flags a 2>stderr &&
-			test_i18ngrep 'This is only supported with -P under PCRE v2' stderr
+			test_grep 'This is only supported with -P under PCRE v2' stderr
 		"
 	else
 		test_expect_success "PANIC: Test framework error. Unknown matches value $matches" 'false'
@@ -59,7 +60,7 @@ test_expect_success 'setup' "
 	git commit -m.
 "
 
-# Simple fixed-string matching that can use kwset (no -i && non-ASCII)
+# Simple fixed-string matching
 nul_match P P P '-F' 'yQf'
 nul_match P P P '-F' 'yQx'
 nul_match P P P '-Fi' 'YQf'
@@ -78,7 +79,7 @@ nul_match P P P '-Fi' '[Y]QF'
 nul_match P P P '-F' 'æQ[ð]'
 nul_match P P P '-F' '[æ]Qð'
 
-# The -F kwset codepath can't handle -i && non-ASCII...
+# Matching pattern and subject case with -i
 nul_match P 1 1 '-i' '[æ]Qð'
 
 # ...PCRE v2 only matches non-ASCII with -i casefolding under UTF-8
diff --git a/t/t7817-grep-sparse-checkout.sh b/t/t7817-grep-sparse-checkout.sh
new file mode 100755
index 0000000..eb59564
--- /dev/null
+++ b/t/t7817-grep-sparse-checkout.sh
@@ -0,0 +1,181 @@
+#!/bin/sh
+
+test_description='grep in sparse checkout
+
+This test creates a repo with the following structure:
+
+.
+|-- a
+|-- b
+|-- dir
+|   `-- c
+|-- sub
+|   |-- A
+|   |   `-- a
+|   `-- B
+|       `-- b
+`-- sub2
+    `-- a
+
+Where the outer repository has non-cone mode sparsity patterns, sub is a
+submodule with cone mode sparsity patterns and sub2 is a submodule that is
+excluded by the superproject sparsity patterns. The resulting sparse checkout
+should leave the following structure in the working tree:
+
+.
+|-- a
+|-- sub
+|   `-- B
+|       `-- b
+`-- sub2
+    `-- a
+
+But note that sub2 should have the SKIP_WORKTREE bit set.
+'
+
+. ./test-lib.sh
+
+test_expect_success 'setup' '
+	echo "text" >a &&
+	echo "text" >b &&
+	mkdir dir &&
+	echo "text" >dir/c &&
+
+	git init sub &&
+	(
+		cd sub &&
+		mkdir A B &&
+		echo "text" >A/a &&
+		echo "text" >B/b &&
+		git add A B &&
+		git commit -m sub &&
+		git sparse-checkout init --cone &&
+		git sparse-checkout set B
+	) &&
+
+	git init sub2 &&
+	(
+		cd sub2 &&
+		echo "text" >a &&
+		git add a &&
+		git commit -m sub2
+	) &&
+
+	git submodule add ./sub &&
+	git submodule add ./sub2 &&
+	git add a b dir &&
+	git commit -m super &&
+	git sparse-checkout init --no-cone &&
+	git sparse-checkout set "/*" "!b" "!/*/" "sub" &&
+
+	git tag -am tag-to-commit tag-to-commit HEAD &&
+	tree=$(git rev-parse HEAD^{tree}) &&
+	git tag -am tag-to-tree tag-to-tree $tree &&
+
+	test_path_is_missing b &&
+	test_path_is_missing dir &&
+	test_path_is_missing sub/A &&
+	test_path_is_file a &&
+	test_path_is_file sub/B/b &&
+	test_path_is_file sub2/a &&
+	git branch -m main
+'
+
+# The test below covers a special case: the sparsity patterns exclude '/b' and
+# sparse checkout is enabled, but the path exists in the working tree (e.g.
+# manually created after `git sparse-checkout init`).  Although b is marked
+# as SKIP_WORKTREE, git grep should notice it IS present in the worktree and
+# report it.
+test_expect_success 'working tree grep honors sparse checkout' '
+	cat >expect <<-EOF &&
+	a:text
+	b:new-text
+	EOF
+	test_when_finished "rm -f b" &&
+	echo "new-text" >b &&
+	git grep "text" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'grep searches unmerged file despite not matching sparsity patterns' '
+	cat >expect <<-EOF &&
+	b:modified-b-in-branchX
+	b:modified-b-in-branchY
+	EOF
+	test_when_finished "test_might_fail git merge --abort && \
+			    git checkout main && git sparse-checkout init" &&
+
+	git sparse-checkout disable &&
+	git checkout -b branchY main &&
+	test_commit modified-b-in-branchY b &&
+	git checkout -b branchX main &&
+	test_commit modified-b-in-branchX b &&
+
+	git sparse-checkout init &&
+	test_path_is_missing b &&
+	test_must_fail git merge branchY &&
+	git grep "modified-b" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'grep --cached searches entries with the SKIP_WORKTREE bit' '
+	cat >expect <<-EOF &&
+	a:text
+	b:text
+	dir/c:text
+	EOF
+	git grep --cached "text" >actual &&
+	test_cmp expect actual
+'
+
+# Note that sub2/ is present in the worktree but it is excluded by the sparsity
+# patterns.  We also explicitly mark it as SKIP_WORKTREE in case it got cleared
+# by previous git commands.  Thus sub2 starts as SKIP_WORKTREE but since it is
+# present in the working tree, grep should recurse into it.
+test_expect_success 'grep --recurse-submodules honors sparse checkout in submodule' '
+	cat >expect <<-EOF &&
+	a:text
+	sub/B/b:text
+	sub2/a:text
+	EOF
+	git update-index --skip-worktree sub2 &&
+	git grep --recurse-submodules "text" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'grep --recurse-submodules --cached searches entries with the SKIP_WORKTREE bit' '
+	cat >expect <<-EOF &&
+	a:text
+	b:text
+	dir/c:text
+	sub/A/a:text
+	sub/B/b:text
+	sub2/a:text
+	EOF
+	git grep --recurse-submodules --cached "text" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'working tree grep does not search the index with CE_VALID and SKIP_WORKTREE' '
+	cat >expect <<-EOF &&
+	a:text
+	EOF
+	test_when_finished "git update-index --no-assume-unchanged b" &&
+	git update-index --assume-unchanged b &&
+	git grep text >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'grep --cached searches index entries with both CE_VALID and SKIP_WORKTREE' '
+	cat >expect <<-EOF &&
+	a:text
+	b:text
+	dir/c:text
+	EOF
+	test_when_finished "git update-index --no-assume-unchanged b" &&
+	git update-index --assume-unchanged b &&
+	git grep --cached text >actual &&
+	test_cmp expect actual
+'
+
+test_done
diff --git a/t/t7900-maintenance.sh b/t/t7900-maintenance.sh
new file mode 100755
index 0000000..0943dfa
--- /dev/null
+++ b/t/t7900-maintenance.sh
@@ -0,0 +1,911 @@
+#!/bin/sh
+
+test_description='git maintenance builtin'
+
+. ./test-lib.sh
+
+GIT_TEST_COMMIT_GRAPH=0
+GIT_TEST_MULTI_PACK_INDEX=0
+
+test_lazy_prereq XMLLINT '
+	xmllint --version
+'
+
+test_xmllint () {
+	if test_have_prereq XMLLINT
+	then
+		xmllint --noout "$@"
+	else
+		true
+	fi
+}
+
+test_lazy_prereq SYSTEMD_ANALYZE '
+	systemd-analyze verify /lib/systemd/system/basic.target
+'
+
+test_systemd_analyze_verify () {
+	if test_have_prereq SYSTEMD_ANALYZE
+	then
+		systemd-analyze verify "$@"
+	fi
+}
+
+test_expect_success 'help text' '
+	test_expect_code 129 git maintenance -h >actual &&
+	test_grep "usage: git maintenance <subcommand>" actual &&
+	test_expect_code 129 git maintenance barf 2>err &&
+	test_grep "unknown subcommand: \`barf'\''" err &&
+	test_grep "usage: git maintenance" err &&
+	test_expect_code 129 git maintenance 2>err &&
+	test_grep "error: need a subcommand" err &&
+	test_grep "usage: git maintenance" err
+'
+
+test_expect_success 'run [--auto|--quiet]' '
+	GIT_TRACE2_EVENT="$(pwd)/run-no-auto.txt" \
+		git maintenance run 2>/dev/null &&
+	GIT_TRACE2_EVENT="$(pwd)/run-auto.txt" \
+		git maintenance run --auto 2>/dev/null &&
+	GIT_TRACE2_EVENT="$(pwd)/run-no-quiet.txt" \
+		git maintenance run --no-quiet 2>/dev/null &&
+	test_subcommand git gc --quiet <run-no-auto.txt &&
+	test_subcommand ! git gc --auto --quiet <run-auto.txt &&
+	test_subcommand git gc --no-quiet <run-no-quiet.txt
+'
+
+test_expect_success 'maintenance.auto config option' '
+	GIT_TRACE2_EVENT="$(pwd)/default" git commit --quiet --allow-empty -m 1 &&
+	test_subcommand git maintenance run --auto --quiet <default &&
+	GIT_TRACE2_EVENT="$(pwd)/true" \
+		git -c maintenance.auto=true \
+		commit --quiet --allow-empty -m 2 &&
+	test_subcommand git maintenance run --auto --quiet  <true &&
+	GIT_TRACE2_EVENT="$(pwd)/false" \
+		git -c maintenance.auto=false \
+		commit --quiet --allow-empty -m 3 &&
+	test_subcommand ! git maintenance run --auto --quiet  <false
+'
+
+test_expect_success 'register uses XDG_CONFIG_HOME config if it exists' '
+	test_when_finished rm -r .config/git/config &&
+	(
+		XDG_CONFIG_HOME=.config &&
+		export XDG_CONFIG_HOME &&
+		mkdir -p $XDG_CONFIG_HOME/git &&
+		>$XDG_CONFIG_HOME/git/config &&
+		git maintenance register &&
+		git config --file=$XDG_CONFIG_HOME/git/config --get maintenance.repo >actual &&
+		pwd >expect &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'register does not need XDG_CONFIG_HOME config to exist' '
+	test_when_finished git maintenance unregister &&
+	test_path_is_missing $XDG_CONFIG_HOME/git/config &&
+	git maintenance register &&
+	git config --global --get maintenance.repo >actual &&
+	pwd >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'unregister uses XDG_CONFIG_HOME config if it exists' '
+	test_when_finished rm -r .config/git/config &&
+	(
+		XDG_CONFIG_HOME=.config &&
+		export XDG_CONFIG_HOME &&
+		mkdir -p $XDG_CONFIG_HOME/git &&
+		>$XDG_CONFIG_HOME/git/config &&
+		git maintenance register &&
+		git maintenance unregister &&
+		test_must_fail git config --file=$XDG_CONFIG_HOME/git/config --get maintenance.repo >actual &&
+		test_must_be_empty actual
+	)
+'
+
+test_expect_success 'unregister does not need XDG_CONFIG_HOME config to exist' '
+	test_path_is_missing $XDG_CONFIG_HOME/git/config &&
+	git maintenance register &&
+	git maintenance unregister &&
+	test_must_fail git config --global --get maintenance.repo >actual &&
+	test_must_be_empty actual
+'
+
+test_expect_success 'maintenance.<task>.enabled' '
+	git config maintenance.gc.enabled false &&
+	git config maintenance.commit-graph.enabled true &&
+	GIT_TRACE2_EVENT="$(pwd)/run-config.txt" git maintenance run 2>err &&
+	test_subcommand ! git gc --quiet <run-config.txt &&
+	test_subcommand git commit-graph write --split --reachable --no-progress <run-config.txt
+'
+
+test_expect_success 'run --task=<task>' '
+	GIT_TRACE2_EVENT="$(pwd)/run-commit-graph.txt" \
+		git maintenance run --task=commit-graph 2>/dev/null &&
+	GIT_TRACE2_EVENT="$(pwd)/run-gc.txt" \
+		git maintenance run --task=gc 2>/dev/null &&
+	GIT_TRACE2_EVENT="$(pwd)/run-commit-graph.txt" \
+		git maintenance run --task=commit-graph 2>/dev/null &&
+	GIT_TRACE2_EVENT="$(pwd)/run-both.txt" \
+		git maintenance run --task=commit-graph --task=gc 2>/dev/null &&
+	test_subcommand ! git gc --quiet <run-commit-graph.txt &&
+	test_subcommand git gc --quiet <run-gc.txt &&
+	test_subcommand git gc --quiet <run-both.txt &&
+	test_subcommand git commit-graph write --split --reachable --no-progress <run-commit-graph.txt &&
+	test_subcommand ! git commit-graph write --split --reachable --no-progress <run-gc.txt &&
+	test_subcommand git commit-graph write --split --reachable --no-progress <run-both.txt
+'
+
+test_expect_success 'core.commitGraph=false prevents write process' '
+	GIT_TRACE2_EVENT="$(pwd)/no-commit-graph.txt" \
+		git -c core.commitGraph=false maintenance run \
+		--task=commit-graph 2>/dev/null &&
+	test_subcommand ! git commit-graph write --split --reachable --no-progress \
+		<no-commit-graph.txt
+'
+
+test_expect_success 'commit-graph auto condition' '
+	COMMAND="maintenance run --task=commit-graph --auto --quiet" &&
+
+	GIT_TRACE2_EVENT="$(pwd)/cg-no.txt" \
+		git -c maintenance.commit-graph.auto=1 $COMMAND &&
+	GIT_TRACE2_EVENT="$(pwd)/cg-negative-means-yes.txt" \
+		git -c maintenance.commit-graph.auto="-1" $COMMAND &&
+
+	test_commit first &&
+
+	GIT_TRACE2_EVENT="$(pwd)/cg-zero-means-no.txt" \
+		git -c maintenance.commit-graph.auto=0 $COMMAND &&
+	GIT_TRACE2_EVENT="$(pwd)/cg-one-satisfied.txt" \
+		git -c maintenance.commit-graph.auto=1 $COMMAND &&
+
+	git commit --allow-empty -m "second" &&
+	git commit --allow-empty -m "third" &&
+
+	GIT_TRACE2_EVENT="$(pwd)/cg-two-satisfied.txt" \
+		git -c maintenance.commit-graph.auto=2 $COMMAND &&
+
+	COMMIT_GRAPH_WRITE="git commit-graph write --split --reachable --no-progress" &&
+	test_subcommand ! $COMMIT_GRAPH_WRITE <cg-no.txt &&
+	test_subcommand $COMMIT_GRAPH_WRITE <cg-negative-means-yes.txt &&
+	test_subcommand ! $COMMIT_GRAPH_WRITE <cg-zero-means-no.txt &&
+	test_subcommand $COMMIT_GRAPH_WRITE <cg-one-satisfied.txt &&
+	test_subcommand $COMMIT_GRAPH_WRITE <cg-two-satisfied.txt
+'
+
+test_expect_success 'run --task=bogus' '
+	test_must_fail git maintenance run --task=bogus 2>err &&
+	test_grep "is not a valid task" err
+'
+
+test_expect_success 'run --task duplicate' '
+	test_must_fail git maintenance run --task=gc --task=gc 2>err &&
+	test_grep "cannot be selected multiple times" err
+'
+
+test_expect_success 'run --task=prefetch with no remotes' '
+	git maintenance run --task=prefetch 2>err &&
+	test_must_be_empty err
+'
+
+test_expect_success 'prefetch multiple remotes' '
+	git clone . clone1 &&
+	git clone . clone2 &&
+	git remote add remote1 "file://$(pwd)/clone1" &&
+	git remote add remote2 "file://$(pwd)/clone2" &&
+	git -C clone1 switch -c one &&
+	git -C clone2 switch -c two &&
+	test_commit -C clone1 one &&
+	test_commit -C clone2 two &&
+	GIT_TRACE2_EVENT="$(pwd)/run-prefetch.txt" git maintenance run --task=prefetch 2>/dev/null &&
+	fetchargs="--prefetch --prune --no-tags --no-write-fetch-head --recurse-submodules=no --quiet" &&
+	test_subcommand git fetch remote1 $fetchargs <run-prefetch.txt &&
+	test_subcommand git fetch remote2 $fetchargs <run-prefetch.txt &&
+	git for-each-ref refs/remotes >actual &&
+	test_must_be_empty actual &&
+	git log prefetch/remotes/remote1/one &&
+	git log prefetch/remotes/remote2/two &&
+	git fetch --all &&
+	test_cmp_rev refs/remotes/remote1/one refs/prefetch/remotes/remote1/one &&
+	test_cmp_rev refs/remotes/remote2/two refs/prefetch/remotes/remote2/two &&
+
+	git log --oneline --decorate --all >log &&
+	! grep "prefetch" log &&
+
+	test_when_finished git config --unset remote.remote1.skipFetchAll &&
+	git config remote.remote1.skipFetchAll true &&
+	GIT_TRACE2_EVENT="$(pwd)/skip-remote1.txt" git maintenance run --task=prefetch 2>/dev/null &&
+	test_subcommand ! git fetch remote1 $fetchargs <skip-remote1.txt &&
+	test_subcommand git fetch remote2 $fetchargs <skip-remote1.txt
+'
+
+test_expect_success 'loose-objects task' '
+	# Repack everything so we know the state of the object dir
+	git repack -adk &&
+
+	# Hack to stop maintenance from running during "git commit"
+	echo in use >.git/objects/maintenance.lock &&
+
+	# Assuming that "git commit" creates at least one loose object
+	test_commit create-loose-object &&
+	rm .git/objects/maintenance.lock &&
+
+	ls .git/objects >obj-dir-before &&
+	test_file_not_empty obj-dir-before &&
+	ls .git/objects/pack/*.pack >packs-before &&
+	test_line_count = 1 packs-before &&
+
+	# The first run creates a pack-file
+	# but does not delete loose objects.
+	git maintenance run --task=loose-objects &&
+	ls .git/objects >obj-dir-between &&
+	test_cmp obj-dir-before obj-dir-between &&
+	ls .git/objects/pack/*.pack >packs-between &&
+	test_line_count = 2 packs-between &&
+	ls .git/objects/pack/loose-*.pack >loose-packs &&
+	test_line_count = 1 loose-packs &&
+
+	# The second run deletes loose objects
+	# but does not create a pack-file.
+	git maintenance run --task=loose-objects &&
+	ls .git/objects >obj-dir-after &&
+	cat >expect <<-\EOF &&
+	info
+	pack
+	EOF
+	test_cmp expect obj-dir-after &&
+	ls .git/objects/pack/*.pack >packs-after &&
+	test_cmp packs-between packs-after
+'
+
+test_expect_success 'maintenance.loose-objects.auto' '
+	git repack -adk &&
+	GIT_TRACE2_EVENT="$(pwd)/trace-lo1.txt" \
+		git -c maintenance.loose-objects.auto=1 maintenance \
+		run --auto --task=loose-objects 2>/dev/null &&
+	test_subcommand ! git prune-packed --quiet <trace-lo1.txt &&
+	printf data-A | git hash-object -t blob --stdin -w &&
+	GIT_TRACE2_EVENT="$(pwd)/trace-loA" \
+		git -c maintenance.loose-objects.auto=2 \
+		maintenance run --auto --task=loose-objects 2>/dev/null &&
+	test_subcommand ! git prune-packed --quiet <trace-loA &&
+	printf data-B | git hash-object -t blob --stdin -w &&
+	GIT_TRACE2_EVENT="$(pwd)/trace-loB" \
+		git -c maintenance.loose-objects.auto=2 \
+		maintenance run --auto --task=loose-objects 2>/dev/null &&
+	test_subcommand git prune-packed --quiet <trace-loB &&
+	GIT_TRACE2_EVENT="$(pwd)/trace-loC" \
+		git -c maintenance.loose-objects.auto=2 \
+		maintenance run --auto --task=loose-objects 2>/dev/null &&
+	test_subcommand git prune-packed --quiet <trace-loC
+'
+
+test_expect_success 'incremental-repack task' '
+	packDir=.git/objects/pack &&
+	for i in $(test_seq 1 5)
+	do
+		test_commit $i || return 1
+	done &&
+
+	# Create three disjoint pack-files with size BIG, small, small.
+	echo HEAD~2 | git pack-objects --revs $packDir/test-1 &&
+	test_tick &&
+	git pack-objects --revs $packDir/test-2 <<-\EOF &&
+	HEAD~1
+	^HEAD~2
+	EOF
+	test_tick &&
+	git pack-objects --revs $packDir/test-3 <<-\EOF &&
+	HEAD
+	^HEAD~1
+	EOF
+
+	# Delete refs that have not been repacked in these packs.
+	git for-each-ref --format="delete %(refname)" \
+		refs/prefetch refs/tags refs/remotes >refs &&
+	git update-ref --stdin <refs &&
+
+	# Replace the object directory with this pack layout.
+	rm -f $packDir/pack-* &&
+	rm -f $packDir/loose-* &&
+	ls $packDir/*.pack >packs-before &&
+	test_line_count = 3 packs-before &&
+
+	# make sure we do not have any broken refs that were
+	# missed in the deletion above
+	git for-each-ref &&
+
+	# the job repacks the two into a new pack, but does not
+	# delete the old ones.
+	git maintenance run --task=incremental-repack &&
+	ls $packDir/*.pack >packs-between &&
+	test_line_count = 4 packs-between &&
+
+	# the job deletes the two old packs, and does not write
+	# a new one because the batch size is not high enough to
+	# pack the largest pack-file.
+	git maintenance run --task=incremental-repack &&
+	ls .git/objects/pack/*.pack >packs-after &&
+	test_line_count = 2 packs-after
+'
+
+test_expect_success EXPENSIVE 'incremental-repack 2g limit' '
+	test_config core.compression 0 &&
+
+	for i in $(test_seq 1 5)
+	do
+		test-tool genrandom foo$i $((512 * 1024 * 1024 + 1)) >>big ||
+		return 1
+	done &&
+	git add big &&
+	git commit -qm "Add big file (1)" &&
+
+	# ensure any possible loose objects are in a pack-file
+	git maintenance run --task=loose-objects &&
+
+	rm big &&
+	for i in $(test_seq 6 10)
+	do
+		test-tool genrandom foo$i $((512 * 1024 * 1024 + 1)) >>big ||
+		return 1
+	done &&
+	git add big &&
+	git commit -qm "Add big file (2)" &&
+
+	# ensure any possible loose objects are in a pack-file
+	git maintenance run --task=loose-objects &&
+
+	# Now run the incremental-repack task and check the batch-size
+	GIT_TRACE2_EVENT="$(pwd)/run-2g.txt" git maintenance run \
+		--task=incremental-repack 2>/dev/null &&
+	test_subcommand git multi-pack-index repack \
+		 --no-progress --batch-size=2147483647 <run-2g.txt
+'
+
+run_incremental_repack_and_verify () {
+	test_commit A &&
+	git repack -adk &&
+	git multi-pack-index write &&
+	GIT_TRACE2_EVENT="$(pwd)/midx-init.txt" git \
+		-c maintenance.incremental-repack.auto=1 \
+		maintenance run --auto --task=incremental-repack 2>/dev/null &&
+	test_subcommand ! git multi-pack-index write --no-progress <midx-init.txt &&
+	test_commit B &&
+	git pack-objects --revs .git/objects/pack/pack <<-\EOF &&
+	HEAD
+	^HEAD~1
+	EOF
+	GIT_TRACE2_EVENT=$(pwd)/trace-A git \
+		-c maintenance.incremental-repack.auto=2 \
+		maintenance run --auto --task=incremental-repack 2>/dev/null &&
+	test_subcommand ! git multi-pack-index write --no-progress <trace-A &&
+	test_commit C &&
+	git pack-objects --revs .git/objects/pack/pack <<-\EOF &&
+	HEAD
+	^HEAD~1
+	EOF
+	GIT_TRACE2_EVENT=$(pwd)/trace-B git \
+		-c maintenance.incremental-repack.auto=2 \
+		maintenance run --auto --task=incremental-repack 2>/dev/null &&
+	test_subcommand git multi-pack-index write --no-progress <trace-B
+}
+
+test_expect_success 'maintenance.incremental-repack.auto' '
+	rm -rf incremental-repack-true &&
+	git init incremental-repack-true &&
+	(
+		cd incremental-repack-true &&
+		git config core.multiPackIndex true &&
+		run_incremental_repack_and_verify
+	)
+'
+
+test_expect_success 'maintenance.incremental-repack.auto (when config is unset)' '
+	rm -rf incremental-repack-unset &&
+	git init incremental-repack-unset &&
+	(
+		cd incremental-repack-unset &&
+		test_unconfig core.multiPackIndex &&
+		run_incremental_repack_and_verify
+	)
+'
+
+test_expect_success 'pack-refs task' '
+	for n in $(test_seq 1 5)
+	do
+		git branch -f to-pack/$n HEAD || return 1
+	done &&
+	GIT_TRACE2_EVENT="$(pwd)/pack-refs.txt" \
+		git maintenance run --task=pack-refs &&
+	test_subcommand git pack-refs --all --prune <pack-refs.txt
+'
+
+test_expect_success '--auto and --schedule incompatible' '
+	test_must_fail git maintenance run --auto --schedule=daily 2>err &&
+	test_grep "at most one" err
+'
+
+test_expect_success 'invalid --schedule value' '
+	test_must_fail git maintenance run --schedule=annually 2>err &&
+	test_grep "unrecognized --schedule" err
+'
+
+test_expect_success '--schedule inheritance weekly -> daily -> hourly' '
+	git config maintenance.loose-objects.enabled true &&
+	git config maintenance.loose-objects.schedule hourly &&
+	git config maintenance.commit-graph.enabled true &&
+	git config maintenance.commit-graph.schedule daily &&
+	git config maintenance.incremental-repack.enabled true &&
+	git config maintenance.incremental-repack.schedule weekly &&
+
+	GIT_TRACE2_EVENT="$(pwd)/hourly.txt" \
+		git maintenance run --schedule=hourly 2>/dev/null &&
+	test_subcommand git prune-packed --quiet <hourly.txt &&
+	test_subcommand ! git commit-graph write --split --reachable \
+		--no-progress <hourly.txt &&
+	test_subcommand ! git multi-pack-index write --no-progress <hourly.txt &&
+
+	GIT_TRACE2_EVENT="$(pwd)/daily.txt" \
+		git maintenance run --schedule=daily 2>/dev/null &&
+	test_subcommand git prune-packed --quiet <daily.txt &&
+	test_subcommand git commit-graph write --split --reachable \
+		--no-progress <daily.txt &&
+	test_subcommand ! git multi-pack-index write --no-progress <daily.txt &&
+
+	GIT_TRACE2_EVENT="$(pwd)/weekly.txt" \
+		git maintenance run --schedule=weekly 2>/dev/null &&
+	test_subcommand git prune-packed --quiet <weekly.txt &&
+	test_subcommand git commit-graph write --split --reachable \
+		--no-progress <weekly.txt &&
+	test_subcommand git multi-pack-index write --no-progress <weekly.txt
+'
+
+test_expect_success 'maintenance.strategy inheritance' '
+	for task in commit-graph loose-objects incremental-repack
+	do
+		git config --unset maintenance.$task.schedule || return 1
+	done &&
+
+	test_when_finished git config --unset maintenance.strategy &&
+	git config maintenance.strategy incremental &&
+
+	GIT_TRACE2_EVENT="$(pwd)/incremental-hourly.txt" \
+		git maintenance run --schedule=hourly --quiet &&
+	GIT_TRACE2_EVENT="$(pwd)/incremental-daily.txt" \
+		git maintenance run --schedule=daily --quiet &&
+	GIT_TRACE2_EVENT="$(pwd)/incremental-weekly.txt" \
+		git maintenance run --schedule=weekly --quiet &&
+
+	test_subcommand git commit-graph write --split --reachable \
+		--no-progress <incremental-hourly.txt &&
+	test_subcommand ! git prune-packed --quiet <incremental-hourly.txt &&
+	test_subcommand ! git multi-pack-index write --no-progress \
+		<incremental-hourly.txt &&
+	test_subcommand ! git pack-refs --all --prune \
+		<incremental-hourly.txt &&
+
+	test_subcommand git commit-graph write --split --reachable \
+		--no-progress <incremental-daily.txt &&
+	test_subcommand git prune-packed --quiet <incremental-daily.txt &&
+	test_subcommand git multi-pack-index write --no-progress \
+		<incremental-daily.txt &&
+	test_subcommand ! git pack-refs --all --prune \
+		<incremental-daily.txt &&
+
+	test_subcommand git commit-graph write --split --reachable \
+		--no-progress <incremental-weekly.txt &&
+	test_subcommand git prune-packed --quiet <incremental-weekly.txt &&
+	test_subcommand git multi-pack-index write --no-progress \
+		<incremental-weekly.txt &&
+	test_subcommand git pack-refs --all --prune \
+		<incremental-weekly.txt &&
+
+	# Modify defaults
+	git config maintenance.commit-graph.schedule daily &&
+	git config maintenance.loose-objects.schedule hourly &&
+	git config maintenance.incremental-repack.enabled false &&
+
+	GIT_TRACE2_EVENT="$(pwd)/modified-hourly.txt" \
+		git maintenance run --schedule=hourly --quiet &&
+	GIT_TRACE2_EVENT="$(pwd)/modified-daily.txt" \
+		git maintenance run --schedule=daily --quiet &&
+
+	test_subcommand ! git commit-graph write --split --reachable \
+		--no-progress <modified-hourly.txt &&
+	test_subcommand git prune-packed --quiet <modified-hourly.txt &&
+	test_subcommand ! git multi-pack-index write --no-progress \
+		<modified-hourly.txt &&
+
+	test_subcommand git commit-graph write --split --reachable \
+		--no-progress <modified-daily.txt &&
+	test_subcommand git prune-packed --quiet <modified-daily.txt &&
+	test_subcommand ! git multi-pack-index write --no-progress \
+		<modified-daily.txt
+'
+
+test_expect_success 'register and unregister' '
+	test_when_finished git config --global --unset-all maintenance.repo &&
+
+	test_must_fail git maintenance unregister 2>err &&
+	grep "is not registered" err &&
+	git maintenance unregister --force &&
+
+	git config --global --add maintenance.repo /existing1 &&
+	git config --global --add maintenance.repo /existing2 &&
+	git config --global --get-all maintenance.repo >before &&
+
+	git maintenance register &&
+	test_cmp_config false maintenance.auto &&
+	git config --global --get-all maintenance.repo >between &&
+	cp before expect &&
+	pwd >>expect &&
+	test_cmp expect between &&
+
+	git maintenance unregister &&
+	git config --global --get-all maintenance.repo >actual &&
+	test_cmp before actual &&
+
+	git config --file ./other --add maintenance.repo /existing1 &&
+	git config --file ./other --add maintenance.repo /existing2 &&
+	git config --file ./other --get-all maintenance.repo >before &&
+
+	git maintenance register --config-file ./other &&
+	test_cmp_config false maintenance.auto &&
+	git config --file ./other --get-all maintenance.repo >between &&
+	cp before expect &&
+	pwd >>expect &&
+	test_cmp expect between &&
+
+	git maintenance unregister --config-file ./other &&
+	git config --file ./other --get-all maintenance.repo >actual &&
+	test_cmp before actual &&
+
+	test_must_fail git maintenance unregister 2>err &&
+	grep "is not registered" err &&
+	git maintenance unregister --force &&
+
+	test_must_fail git maintenance unregister --config-file ./other 2>err &&
+	grep "is not registered" err &&
+	git maintenance unregister --config-file ./other --force
+'
+
+test_expect_success 'register with no value for maintenance.repo' '
+	cp .git/config .git/config.orig &&
+	test_when_finished mv .git/config.orig .git/config &&
+
+	cat >>.git/config <<-\EOF &&
+	[maintenance]
+		repo
+	EOF
+	cat >expect <<-\EOF &&
+	error: missing value for '\''maintenance.repo'\''
+	EOF
+	git maintenance register 2>actual &&
+	test_cmp expect actual &&
+	git config maintenance.repo
+'
+
+test_expect_success 'unregister with no value for maintenance.repo' '
+	cp .git/config .git/config.orig &&
+	test_when_finished mv .git/config.orig .git/config &&
+
+	cat >>.git/config <<-\EOF &&
+	[maintenance]
+		repo
+	EOF
+	cat >expect <<-\EOF &&
+	error: missing value for '\''maintenance.repo'\''
+	EOF
+	test_expect_code 128 git maintenance unregister 2>actual.raw &&
+	grep ^error actual.raw >actual &&
+	test_cmp expect actual &&
+	git config maintenance.repo &&
+
+	git maintenance unregister --force 2>actual.raw &&
+	grep ^error actual.raw >actual &&
+	test_cmp expect actual &&
+	git config maintenance.repo
+'
+
+test_expect_success !MINGW 'register and unregister with regex metacharacters' '
+	META="a+b*c" &&
+	git init "$META" &&
+	git -C "$META" maintenance register &&
+	git config --get-all --show-origin maintenance.repo &&
+	git config --get-all --global --fixed-value \
+		maintenance.repo "$(pwd)/$META" &&
+	git -C "$META" maintenance unregister &&
+	test_must_fail git config --get-all --global --fixed-value \
+		maintenance.repo "$(pwd)/$META"
+'
+
+test_expect_success 'start --scheduler=<scheduler>' '
+	test_expect_code 129 git maintenance start --scheduler=foo 2>err &&
+	test_grep "unrecognized --scheduler argument" err &&
+
+	test_expect_code 129 git maintenance start --no-scheduler 2>err &&
+	test_grep "unknown option" err &&
+
+	test_expect_code 128 \
+		env GIT_TEST_MAINT_SCHEDULER="launchctl:true,schtasks:true" \
+		git maintenance start --scheduler=crontab 2>err &&
+	test_grep "fatal: crontab scheduler is not available" err
+'
+
+test_expect_success 'start from empty cron table' '
+	GIT_TEST_MAINT_SCHEDULER="crontab:test-tool crontab cron.txt" git maintenance start --scheduler=crontab &&
+
+	# start registers the repo
+	git config --get --global --fixed-value maintenance.repo "$(pwd)" &&
+
+	grep "for-each-repo --config=maintenance.repo maintenance run --schedule=daily" cron.txt &&
+	grep "for-each-repo --config=maintenance.repo maintenance run --schedule=hourly" cron.txt &&
+	grep "for-each-repo --config=maintenance.repo maintenance run --schedule=weekly" cron.txt
+'
+
+test_expect_success 'stop from existing schedule' '
+	GIT_TEST_MAINT_SCHEDULER="crontab:test-tool crontab cron.txt" git maintenance stop &&
+
+	# stop does not unregister the repo
+	git config --get --global --fixed-value maintenance.repo "$(pwd)" &&
+
+	# Operation is idempotent
+	GIT_TEST_MAINT_SCHEDULER="crontab:test-tool crontab cron.txt" git maintenance stop &&
+	test_must_be_empty cron.txt
+'
+
+test_expect_success 'start preserves existing schedule' '
+	echo "Important information!" >cron.txt &&
+	GIT_TEST_MAINT_SCHEDULER="crontab:test-tool crontab cron.txt" git maintenance start --scheduler=crontab &&
+	grep "Important information!" cron.txt
+'
+
+test_expect_success 'magic markers are correct' '
+	grep "GIT MAINTENANCE SCHEDULE" cron.txt >actual &&
+	cat >expect <<-\EOF &&
+	# BEGIN GIT MAINTENANCE SCHEDULE
+	# END GIT MAINTENANCE SCHEDULE
+	EOF
+	test_cmp actual expect
+'
+
+test_expect_success 'stop preserves surrounding schedule' '
+	echo "Crucial information!" >>cron.txt &&
+	GIT_TEST_MAINT_SCHEDULER="crontab:test-tool crontab cron.txt" git maintenance stop &&
+	grep "Important information!" cron.txt &&
+	grep "Crucial information!" cron.txt
+'
+
+test_expect_success 'start and stop macOS maintenance' '
+	# ensure $HOME can be compared against hook arguments on all platforms
+	pfx=$(cd "$HOME" && pwd) &&
+
+	write_script print-args <<-\EOF &&
+	echo $* | sed "s:gui/[0-9][0-9]*:gui/[UID]:" >>args
+	EOF
+
+	rm -f args &&
+	GIT_TEST_MAINT_SCHEDULER=launchctl:./print-args git maintenance start --scheduler=launchctl &&
+
+	# start registers the repo
+	git config --get --global --fixed-value maintenance.repo "$(pwd)" &&
+
+	ls "$HOME/Library/LaunchAgents" >actual &&
+	cat >expect <<-\EOF &&
+	org.git-scm.git.daily.plist
+	org.git-scm.git.hourly.plist
+	org.git-scm.git.weekly.plist
+	EOF
+	test_cmp expect actual &&
+
+	rm -f expect &&
+	for frequency in hourly daily weekly
+	do
+		PLIST="$pfx/Library/LaunchAgents/org.git-scm.git.$frequency.plist" &&
+		test_xmllint "$PLIST" &&
+		grep schedule=$frequency "$PLIST" &&
+		echo "bootout gui/[UID] $PLIST" >>expect &&
+		echo "bootstrap gui/[UID] $PLIST" >>expect || return 1
+	done &&
+	test_cmp expect args &&
+
+	rm -f args &&
+	GIT_TEST_MAINT_SCHEDULER=launchctl:./print-args git maintenance stop &&
+
+	# stop does not unregister the repo
+	git config --get --global --fixed-value maintenance.repo "$(pwd)" &&
+
+	printf "bootout gui/[UID] $pfx/Library/LaunchAgents/org.git-scm.git.%s.plist\n" \
+		hourly daily weekly >expect &&
+	test_cmp expect args &&
+	ls "$HOME/Library/LaunchAgents" >actual &&
+	test_line_count = 0 actual
+'
+
+test_expect_success 'use launchctl list to prevent extra work' '
+	# ensure we are registered
+	GIT_TEST_MAINT_SCHEDULER=launchctl:./print-args git maintenance start --scheduler=launchctl &&
+
+	# do it again on a fresh args file
+	rm -f args &&
+	GIT_TEST_MAINT_SCHEDULER=launchctl:./print-args git maintenance start --scheduler=launchctl &&
+
+	ls "$HOME/Library/LaunchAgents" >actual &&
+	cat >expect <<-\EOF &&
+	list org.git-scm.git.hourly
+	list org.git-scm.git.daily
+	list org.git-scm.git.weekly
+	EOF
+	test_cmp expect args
+'
+
+test_expect_success 'start and stop Windows maintenance' '
+	write_script print-args <<-\EOF &&
+	echo $* >>args
+	while test $# -gt 0
+	do
+		case "$1" in
+		/xml) shift; xmlfile=$1; break ;;
+		*) shift ;;
+		esac
+	done
+	test -z "$xmlfile" || cp "$xmlfile" "$xmlfile.xml"
+	EOF
+
+	rm -f args &&
+	GIT_TEST_MAINT_SCHEDULER="schtasks:./print-args" git maintenance start --scheduler=schtasks &&
+
+	# start registers the repo
+	git config --get --global --fixed-value maintenance.repo "$(pwd)" &&
+
+	for frequency in hourly daily weekly
+	do
+		grep "/create /tn Git Maintenance ($frequency) /f /xml" args &&
+		file=$(ls .git/schedule_${frequency}*.xml) &&
+		test_xmllint "$file" || return 1
+	done &&
+
+	rm -f args &&
+	GIT_TEST_MAINT_SCHEDULER="schtasks:./print-args" git maintenance stop &&
+
+	# stop does not unregister the repo
+	git config --get --global --fixed-value maintenance.repo "$(pwd)" &&
+
+	printf "/delete /tn Git Maintenance (%s) /f\n" \
+		hourly daily weekly >expect &&
+	test_cmp expect args
+'
+
+test_expect_success 'start and stop Linux/systemd maintenance' '
+	write_script print-args <<-\EOF &&
+	printf "%s\n" "$*" >>args
+	EOF
+
+	XDG_CONFIG_HOME="$PWD" &&
+	export XDG_CONFIG_HOME &&
+	rm -f args &&
+	GIT_TEST_MAINT_SCHEDULER="systemctl:./print-args" git maintenance start --scheduler=systemd-timer &&
+
+	# start registers the repo
+	git config --get --global --fixed-value maintenance.repo "$(pwd)" &&
+
+	for schedule in hourly daily weekly
+	do
+		test_path_is_file "systemd/user/git-maintenance@$schedule.timer" || return 1
+	done &&
+	test_path_is_file "systemd/user/git-maintenance@.service" &&
+
+	test_systemd_analyze_verify "systemd/user/git-maintenance@hourly.service" &&
+	test_systemd_analyze_verify "systemd/user/git-maintenance@daily.service" &&
+	test_systemd_analyze_verify "systemd/user/git-maintenance@weekly.service" &&
+
+	printf -- "--user enable --now git-maintenance@%s.timer\n" hourly daily weekly >expect &&
+	test_cmp expect args &&
+
+	rm -f args &&
+	GIT_TEST_MAINT_SCHEDULER="systemctl:./print-args" git maintenance stop &&
+
+	# stop does not unregister the repo
+	git config --get --global --fixed-value maintenance.repo "$(pwd)" &&
+
+	for schedule in hourly daily weekly
+	do
+		test_path_is_missing "systemd/user/git-maintenance@$schedule.timer" || return 1
+	done &&
+	test_path_is_missing "systemd/user/git-maintenance@.service" &&
+
+	printf -- "--user disable --now git-maintenance@%s.timer\n" hourly daily weekly >expect &&
+	test_cmp expect args
+'
+
+test_expect_success 'start and stop when several schedulers are available' '
+	write_script print-args <<-\EOF &&
+	printf "%s\n" "$*" | sed "s:gui/[0-9][0-9]*:gui/[UID]:; s:\(schtasks /create .* /xml\).*:\1:;" >>args
+	EOF
+
+	rm -f args &&
+	GIT_TEST_MAINT_SCHEDULER="systemctl:./print-args systemctl,launchctl:./print-args launchctl,schtasks:./print-args schtasks" git maintenance start --scheduler=systemd-timer &&
+	printf "launchctl bootout gui/[UID] $pfx/Library/LaunchAgents/org.git-scm.git.%s.plist\n" \
+		hourly daily weekly >expect &&
+	printf "schtasks /delete /tn Git Maintenance (%s) /f\n" \
+		hourly daily weekly >>expect &&
+	printf -- "systemctl --user enable --now git-maintenance@%s.timer\n" hourly daily weekly >>expect &&
+	test_cmp expect args &&
+
+	rm -f args &&
+	GIT_TEST_MAINT_SCHEDULER="systemctl:./print-args systemctl,launchctl:./print-args launchctl,schtasks:./print-args schtasks" git maintenance start --scheduler=launchctl &&
+	printf -- "systemctl --user disable --now git-maintenance@%s.timer\n" hourly daily weekly >expect &&
+	printf "schtasks /delete /tn Git Maintenance (%s) /f\n" \
+		hourly daily weekly >>expect &&
+	for frequency in hourly daily weekly
+	do
+		PLIST="$pfx/Library/LaunchAgents/org.git-scm.git.$frequency.plist" &&
+		echo "launchctl bootout gui/[UID] $PLIST" >>expect &&
+		echo "launchctl bootstrap gui/[UID] $PLIST" >>expect || return 1
+	done &&
+	test_cmp expect args &&
+
+	rm -f args &&
+	GIT_TEST_MAINT_SCHEDULER="systemctl:./print-args systemctl,launchctl:./print-args launchctl,schtasks:./print-args schtasks" git maintenance start --scheduler=schtasks &&
+	printf -- "systemctl --user disable --now git-maintenance@%s.timer\n" hourly daily weekly >expect &&
+	printf "launchctl bootout gui/[UID] $pfx/Library/LaunchAgents/org.git-scm.git.%s.plist\n" \
+		hourly daily weekly >>expect &&
+	printf "schtasks /create /tn Git Maintenance (%s) /f /xml\n" \
+		hourly daily weekly >>expect &&
+	test_cmp expect args &&
+
+	rm -f args &&
+	GIT_TEST_MAINT_SCHEDULER="systemctl:./print-args systemctl,launchctl:./print-args launchctl,schtasks:./print-args schtasks" git maintenance stop &&
+	printf -- "systemctl --user disable --now git-maintenance@%s.timer\n" hourly daily weekly >expect &&
+	printf "launchctl bootout gui/[UID] $pfx/Library/LaunchAgents/org.git-scm.git.%s.plist\n" \
+		hourly daily weekly >>expect &&
+	printf "schtasks /delete /tn Git Maintenance (%s) /f\n" \
+		hourly daily weekly >>expect &&
+	test_cmp expect args
+'
+
+test_expect_success 'register preserves existing strategy' '
+	git config maintenance.strategy none &&
+	git maintenance register &&
+	test_config maintenance.strategy none &&
+	git config --unset maintenance.strategy &&
+	git maintenance register &&
+	test_config maintenance.strategy incremental
+'
+
+test_expect_success 'fails when running outside of a repository' '
+	nongit test_must_fail git maintenance run &&
+	nongit test_must_fail git maintenance stop &&
+	nongit test_must_fail git maintenance start &&
+	nongit test_must_fail git maintenance register &&
+	nongit test_must_fail git maintenance unregister
+'
+
+test_expect_success 'register and unregister bare repo' '
+	test_when_finished "git config --global --unset-all maintenance.repo || :" &&
+	test_might_fail git config --global --unset-all maintenance.repo &&
+	git init --bare barerepo &&
+	(
+		cd barerepo &&
+		git maintenance register &&
+		git config --get --global --fixed-value maintenance.repo "$(pwd)" &&
+		git maintenance unregister &&
+		test_must_fail git config --global --get-all maintenance.repo
+	)
+'
+
+test_expect_success 'failed schedule prevents config change' '
+	git init --bare failcase &&
+
+	for scheduler in crontab launchctl schtasks systemctl
+	do
+		GIT_TEST_MAINT_SCHEDULER="$scheduler:false" &&
+		export GIT_TEST_MAINT_SCHEDULER &&
+		test_must_fail \
+			git -C failcase maintenance start &&
+		test_must_fail git -C failcase config maintenance.auto || return 1
+	done
+'
+
+test_done
diff --git a/t/t8001-annotate.sh b/t/t8001-annotate.sh
index 72176e4..d7167f5 100755
--- a/t/t8001-annotate.sh
+++ b/t/t8001-annotate.sh
@@ -1,13 +1,17 @@
 #!/bin/sh
 
 test_description='git annotate'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_CREATE_REPO_NO_TEMPLATE=1
 . ./test-lib.sh
 
 PROG='git annotate'
 . "$TEST_DIRECTORY"/annotate-tests.sh
 
 test_expect_success 'annotate old revision' '
-	git annotate file master >actual &&
+	git annotate file main >actual &&
 	awk "{ print \$3; }" <actual >authors &&
 	test 2 = $(grep A <authors | wc -l) &&
 	test 2 = $(grep B <authors | wc -l)
diff --git a/t/t8002-blame.sh b/t/t8002-blame.sh
index 015973e..0147de3 100755
--- a/t/t8002-blame.sh
+++ b/t/t8002-blame.sh
@@ -1,6 +1,10 @@
 #!/bin/sh
 
 test_description='git blame'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_CREATE_REPO_NO_TEMPLATE=1
 . ./test-lib.sh
 
 PROG='git blame -c'
@@ -94,7 +98,7 @@ test_expect_success 'set up abbrev tests' '
 	test_commit abbrev &&
 	sha1=$(git rev-parse --verify HEAD) &&
 	check_abbrev () {
-		expect=$1; shift
+		expect=$1 && shift &&
 		echo $sha1 | cut -c 1-$expect >expect &&
 		git blame "$@" abbrev.t >actual &&
 		perl -lne "/[0-9a-f]+/ and print \$&" <actual >actual.sha &&
diff --git a/t/t8003-blame-corner-cases.sh b/t/t8003-blame-corner-cases.sh
index b871dd4..7312655 100755
--- a/t/t8003-blame-corner-cases.sh
+++ b/t/t8003-blame-corner-cases.sh
@@ -1,6 +1,9 @@
 #!/bin/sh
 
 test_description='git blame corner cases'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 pick_fc='s/^[0-9a-f^]* *\([^ ]*\) *(\([^ ]*\) .*/\1-\2/'
@@ -10,14 +13,8 @@ test_expect_success setup '
 	echo B B B B B >two &&
 	echo C C C C C >tres &&
 	echo ABC >mouse &&
-	for i in 1 2 3 4 5 6 7 8 9
-	do
-		echo $i
-	done >nine_lines &&
-	for i in 1 2 3 4 5 6 7 8 9 a
-	do
-		echo $i
-	done >ten_lines &&
+	test_write_lines 1 2 3 4 5 6 7 8 9 >nine_lines &&
+	test_write_lines 1 2 3 4 5 6 7 8 9 a >ten_lines &&
 	git add one two tres mouse nine_lines ten_lines &&
 	test_tick &&
 	GIT_AUTHOR_NAME=Initial git commit -m Initial &&
@@ -161,13 +158,13 @@ test_expect_success 'blame wholesale copy and more in the index' '
 
 test_expect_success 'blame during cherry-pick with file rename conflict' '
 
-	test_when_finished "git reset --hard && git checkout master" &&
+	test_when_finished "git reset --hard && git checkout main" &&
 	git checkout HEAD~3 &&
 	echo MOUSE >> mouse &&
 	git mv mouse rodent &&
 	git add rodent &&
 	GIT_AUTHOR_NAME=Rodent git commit -m "rodent" &&
-	git checkout --detach master &&
+	git checkout --detach main &&
 	(git cherry-pick HEAD@{1} || test $? -eq 1) &&
 	git show HEAD@{1}:rodent > rodent &&
 	git add rodent &&
@@ -204,13 +201,13 @@ committer David Reiss <dreiss@facebook.com> 1234567890 +0000
 
 some message
 EOF
-  COMMIT=$(git hash-object -t commit -w badcommit) &&
+  COMMIT=$(git hash-object --literally -t commit -w badcommit) &&
   git --no-pager blame $COMMIT -- uno >/dev/null
 '
 
 test_expect_success 'blame -L with invalid start' '
 	test_must_fail git blame -L5 tres 2>errors &&
-	test_i18ngrep "has only 2 lines" errors
+	test_grep "has only 2 lines" errors
 '
 
 test_expect_success 'blame -L with invalid end' '
@@ -273,18 +270,14 @@ test_expect_success 'blame file with CRLF core.autocrlf=true' '
 	grep "A U Thor" actual
 '
 
-# Tests the splitting and merging of blame entries in blame_coalesce().
-# The output of blame is the same, regardless of whether blame_coalesce() runs
-# or not, so we'd likely only notice a problem if blame crashes or assigned
-# blame to the "splitting" commit ('SPLIT' below).
-test_expect_success 'blame coalesce' '
+test_expect_success 'setup coalesce tests' '
 	cat >giraffe <<-\EOF &&
 	ABC
 	DEF
 	EOF
 	git add giraffe &&
 	git commit -m "original file" &&
-	oid=$(git rev-parse HEAD) &&
+	orig=$(git rev-parse HEAD) &&
 
 	cat >giraffe <<-\EOF &&
 	ABC
@@ -293,6 +286,7 @@ test_expect_success 'blame coalesce' '
 	EOF
 	git add giraffe &&
 	git commit -m "interior SPLIT line" &&
+	split=$(git rev-parse HEAD) &&
 
 	cat >giraffe <<-\EOF &&
 	ABC
@@ -300,12 +294,25 @@ test_expect_success 'blame coalesce' '
 	EOF
 	git add giraffe &&
 	git commit -m "same contents as original" &&
+	final=$(git rev-parse HEAD)
+'
+
+test_expect_success 'blame coalesce' '
+	cat >expect <<-EOF &&
+	$orig 1 1 2
+	$orig 2 2
+	EOF
+	git blame --porcelain $final giraffe >actual.raw &&
+	grep "^$orig" actual.raw >actual &&
+	test_cmp expect actual
+'
 
+test_expect_success 'blame does not coalesce non-adjacent result lines' '
 	cat >expect <<-EOF &&
-	$oid 1) ABC
-	$oid 2) DEF
+	$orig 1) ABC
+	$orig 3) DEF
 	EOF
-	git -c core.abbrev=$(test_oid hexsz) blame -s giraffe >actual &&
+	git blame --no-abbrev -s -L1,1 -L3,3 $split giraffe >actual &&
 	test_cmp expect actual
 '
 
diff --git a/t/t8004-blame-with-conflicts.sh b/t/t8004-blame-with-conflicts.sh
index 9c353ab..35414a5 100755
--- a/t/t8004-blame-with-conflicts.sh
+++ b/t/t8004-blame-with-conflicts.sh
@@ -3,6 +3,9 @@
 # Based on a test case submitted by Björn Steinbrink.
 
 test_description='git blame on conflicted files'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 test_expect_success 'setup first case' '
@@ -21,16 +24,16 @@ test_expect_success 'setup first case' '
 	git add file2 &&
 	git commit --author "U Gly <ug@localhost>" -m ugly &&
 
-	# Back to master and change something
-	git checkout master &&
+	# Back to main and change something
+	git checkout main &&
 	echo "
 
 bla" >> file1 &&
 	git commit --author "Old Line <ol@localhost>" -a -m file1.b &&
 
-	# Back to foo and merge master
+	# Back to foo and merge main
 	git checkout foo &&
-	if git merge master; then
+	if git merge main; then
 		echo needed conflict here
 		exit 1
 	else
@@ -44,8 +47,8 @@ Even more" > file2 &&
 	git rm file1 &&
 	git commit --author "M Result <mr@localhost>" -a -m merged &&
 
-	# Back to master and change file1 again
-	git checkout master &&
+	# Back to main and change file1 again
+	git checkout main &&
 	sed s/bla/foo/ <file1 >X &&
 	rm file1 &&
 	mv X file1 &&
@@ -53,7 +56,7 @@ Even more" > file2 &&
 
 	# Try to merge into foo again
 	git checkout foo &&
-	if git merge master; then
+	if git merge main; then
 		echo needed conflict here
 		exit 1
 	else
diff --git a/t/t8007-cat-file-textconv.sh b/t/t8007-cat-file-textconv.sh
index eacd49a..c8266f1 100755
--- a/t/t8007-cat-file-textconv.sh
+++ b/t/t8007-cat-file-textconv.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='git cat-file textconv support'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 cat >helper <<'EOF'
@@ -19,6 +21,48 @@ test_expect_success 'setup ' '
 	GIT_AUTHOR_NAME=Number2 git commit -a -m Second --date="2010-01-01 20:00:00"
 '
 
+test_expect_success 'usage: <bad rev>' '
+	cat >expect <<-\EOF &&
+	fatal: Not a valid object name HEAD2
+	EOF
+	test_must_fail git cat-file --textconv HEAD2 2>actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'usage: <bad rev>:<bad path>' '
+	cat >expect <<-\EOF &&
+	fatal: invalid object name '\''HEAD2'\''.
+	EOF
+	test_must_fail git cat-file --textconv HEAD2:two.bin 2>actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'usage: <rev>:<bad path>' '
+	cat >expect <<-\EOF &&
+	fatal: path '\''two.bin'\'' does not exist in '\''HEAD'\''
+	EOF
+	test_must_fail git cat-file --textconv HEAD:two.bin 2>actual &&
+	test_cmp expect actual
+'
+
+
+test_expect_success 'usage: <rev> with no <path>' '
+	cat >expect <<-\EOF &&
+	fatal: <object>:<path> required, only <object> '\''HEAD'\'' given
+	EOF
+	test_must_fail git cat-file --textconv HEAD 2>actual &&
+	test_cmp expect actual
+'
+
+
+test_expect_success 'usage: <bad rev>:<good (in HEAD) path>' '
+	cat >expect <<-\EOF &&
+	fatal: invalid object name '\''HEAD2'\''.
+	EOF
+	test_must_fail git cat-file --textconv HEAD2:one.bin 2>actual &&
+	test_cmp expect actual
+'
+
 cat >expected <<EOF
 bin: test version 2
 EOF
diff --git a/t/t8010-cat-file-filters.sh b/t/t8010-cat-file-filters.sh
index 31de4b6..eb64b76 100755
--- a/t/t8010-cat-file-filters.sh
+++ b/t/t8010-cat-file-filters.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='git cat-file filters support'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup ' '
@@ -41,7 +43,7 @@ test_expect_success 'cat-file --textconv --path=<path> works' '
 	sha1=$(git rev-parse -q --verify HEAD:world.txt) &&
 	test_config diff.txt.textconv "tr A-Za-z N-ZA-Mn-za-m <" &&
 	git cat-file --textconv --path=hello.txt $sha1 >rot13 &&
-	test uryyb = "$(cat rot13 | remove_cr)"
+	test uryyb = "$(remove_cr <rot13)"
 '
 
 test_expect_success '--path=<path> complains without --textconv/--filters' '
diff --git a/t/t8012-blame-colors.sh b/t/t8012-blame-colors.sh
index ed38f74..c3a5f6d 100755
--- a/t/t8012-blame-colors.sh
+++ b/t/t8012-blame-colors.sh
@@ -1,6 +1,10 @@
 #!/bin/sh
 
 test_description='colored git blame'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_CREATE_REPO_NO_TEMPLATE=1
 . ./test-lib.sh
 
 PROG='git blame -c'
diff --git a/t/t8013-blame-ignore-revs.sh b/t/t8013-blame-ignore-revs.sh
index 36dc31e..dbfbd86 100755
--- a/t/t8013-blame-ignore-revs.sh
+++ b/t/t8013-blame-ignore-revs.sh
@@ -21,30 +21,47 @@ test_expect_success setup '
 	test_tick &&
 	git commit -m X &&
 	git tag X &&
+	git tag -a -m "X (annotated)" XT &&
 
 	git blame --line-porcelain file >blame_raw &&
 
-	grep -E "^[0-9a-f]+ [0-9]+ 1" blame_raw | sed -e "s/ .*//" >actual &&
+	sed -ne "/^[0-9a-f][0-9a-f]* [0-9][0-9]* 1/s/ .*//p" blame_raw >actual &&
 	git rev-parse X >expect &&
 	test_cmp expect actual &&
 
-	grep -E "^[0-9a-f]+ [0-9]+ 2" blame_raw | sed -e "s/ .*//" >actual &&
+	sed -ne "/^[0-9a-f][0-9a-f]* [0-9][0-9]* 2/s/ .*//p" blame_raw >actual &&
 	git rev-parse X >expect &&
 	test_cmp expect actual
+'
+
+# Ensure bogus --ignore-rev requests are caught
+test_expect_success 'validate --ignore-rev' '
+	test_must_fail git blame --ignore-rev X^{tree} file
+'
+
+# Ensure bogus --ignore-revs-file requests are silently accepted
+test_expect_success 'validate --ignore-revs-file' '
+	git rev-parse X^{tree} >ignore_x &&
+	git blame --ignore-revs-file ignore_x file
+'
+
+for I in X XT
+do
+	# Ignore X (or XT), make sure A is blamed for line 1 and B for line 2.
+	# Giving X (i.e. commit) and XT (i.e. annotated tag to commit) should
+	# produce the same result.
+	test_expect_success "ignore_rev_changing_lines ($I)" '
+		git blame --line-porcelain --ignore-rev $I file >blame_raw &&
+
+		sed -ne "/^[0-9a-f][0-9a-f]* [0-9][0-9]* 1/s/ .*//p" blame_raw >actual &&
+		git rev-parse A >expect &&
+		test_cmp expect actual &&
+
+		sed -ne "/^[0-9a-f][0-9a-f]* [0-9][0-9]* 2/s/ .*//p" blame_raw >actual &&
+		git rev-parse B >expect &&
+		test_cmp expect actual
 	'
-
-# Ignore X, make sure A is blamed for line 1 and B for line 2.
-test_expect_success ignore_rev_changing_lines '
-	git blame --line-porcelain --ignore-rev X file >blame_raw &&
-
-	grep -E "^[0-9a-f]+ [0-9]+ 1" blame_raw | sed -e "s/ .*//" >actual &&
-	git rev-parse A >expect &&
-	test_cmp expect actual &&
-
-	grep -E "^[0-9a-f]+ [0-9]+ 2" blame_raw | sed -e "s/ .*//" >actual &&
-	git rev-parse B >expect &&
-	test_cmp expect actual
-	'
+done
 
 # For ignored revs that have added 'unblamable' lines, attribute those to the
 # ignored commit.
@@ -62,12 +79,12 @@ test_expect_success ignore_rev_adding_unblamable_lines '
 	git rev-parse Y >expect &&
 	git blame --line-porcelain file --ignore-rev Y >blame_raw &&
 
-	grep -E "^[0-9a-f]+ [0-9]+ 3" blame_raw | sed -e "s/ .*//" >actual &&
+	sed -ne "/^[0-9a-f][0-9a-f]* [0-9][0-9]* 3/s/ .*//p" blame_raw >actual &&
 	test_cmp expect actual &&
 
-	grep -E "^[0-9a-f]+ [0-9]+ 4" blame_raw | sed -e "s/ .*//" >actual &&
+	sed -ne "/^[0-9a-f][0-9a-f]* [0-9][0-9]* 4/s/ .*//p" blame_raw >actual &&
 	test_cmp expect actual
-	'
+'
 
 # Ignore X and Y, both in separate files.  Lines 1 == A, 2 == B.
 test_expect_success ignore_revs_from_files '
@@ -75,28 +92,28 @@ test_expect_success ignore_revs_from_files '
 	git rev-parse Y >ignore_y &&
 	git blame --line-porcelain file --ignore-revs-file ignore_x --ignore-revs-file ignore_y >blame_raw &&
 
-	grep -E "^[0-9a-f]+ [0-9]+ 1" blame_raw | sed -e "s/ .*//" >actual &&
+	sed -ne "/^[0-9a-f][0-9a-f]* [0-9][0-9]* 1/s/ .*//p" blame_raw >actual &&
 	git rev-parse A >expect &&
 	test_cmp expect actual &&
 
-	grep -E "^[0-9a-f]+ [0-9]+ 2" blame_raw | sed -e "s/ .*//" >actual &&
+	sed -ne "/^[0-9a-f][0-9a-f]* [0-9][0-9]* 2/s/ .*//p" blame_raw >actual &&
 	git rev-parse B >expect &&
 	test_cmp expect actual
-	'
+'
 
 # Ignore X from the config option, Y from a file.
 test_expect_success ignore_revs_from_configs_and_files '
 	git config --add blame.ignoreRevsFile ignore_x &&
 	git blame --line-porcelain file --ignore-revs-file ignore_y >blame_raw &&
 
-	grep -E "^[0-9a-f]+ [0-9]+ 1" blame_raw | sed -e "s/ .*//" >actual &&
+	sed -ne "/^[0-9a-f][0-9a-f]* [0-9][0-9]* 1/s/ .*//p" blame_raw >actual &&
 	git rev-parse A >expect &&
 	test_cmp expect actual &&
 
-	grep -E "^[0-9a-f]+ [0-9]+ 2" blame_raw | sed -e "s/ .*//" >actual &&
+	sed -ne "/^[0-9a-f][0-9a-f]* [0-9][0-9]* 2/s/ .*//p" blame_raw >actual &&
 	git rev-parse B >expect &&
 	test_cmp expect actual
-	'
+'
 
 # Override blame.ignoreRevsFile (ignore_x) with an empty string.  X should be
 # blamed now for lines 1 and 2, since we are no longer ignoring X.
@@ -104,23 +121,23 @@ test_expect_success override_ignore_revs_file '
 	git blame --line-porcelain file --ignore-revs-file "" --ignore-revs-file ignore_y >blame_raw &&
 	git rev-parse X >expect &&
 
-	grep -E "^[0-9a-f]+ [0-9]+ 1" blame_raw | sed -e "s/ .*//" >actual &&
+	sed -ne "/^[0-9a-f][0-9a-f]* [0-9][0-9]* 1/s/ .*//p" blame_raw >actual &&
 	test_cmp expect actual &&
 
-	grep -E "^[0-9a-f]+ [0-9]+ 2" blame_raw | sed -e "s/ .*//" >actual &&
+	sed -ne "/^[0-9a-f][0-9a-f]* [0-9][0-9]* 2/s/ .*//p" blame_raw >actual &&
 	test_cmp expect actual
 	'
 test_expect_success bad_files_and_revs '
 	test_must_fail git blame file --ignore-rev NOREV 2>err &&
-	test_i18ngrep "cannot find revision NOREV to ignore" err &&
+	test_grep "cannot find revision NOREV to ignore" err &&
 
 	test_must_fail git blame file --ignore-revs-file NOFILE 2>err &&
-	test_i18ngrep "could not open.*: NOFILE" err &&
+	test_grep "could not open.*: NOFILE" err &&
 
 	echo NOREV >ignore_norev &&
 	test_must_fail git blame file --ignore-revs-file ignore_norev 2>err &&
-	test_i18ngrep "invalid object name: NOREV" err
-	'
+	test_grep "invalid object name: NOREV" err
+'
 
 # For ignored revs that have added 'unblamable' lines, mark those lines with a
 # '*'
@@ -138,7 +155,7 @@ test_expect_success mark_unblamable_lines '
 
 	sed -n "4p" blame_raw | cut -c1 >actual &&
 	test_cmp expect actual
-	'
+'
 
 # Commit Z will touch the first two lines.  Y touched all four.
 # 	A--B--X--Y--Z
@@ -171,7 +188,7 @@ test_expect_success mark_ignored_lines '
 
 	sed -n "4p" blame_raw | cut -c1 >actual &&
 	! test_cmp expect actual
-	'
+'
 
 # For ignored revs that added 'unblamable' lines and more recent commits changed
 # the blamable lines, mark the unblamable lines with a
@@ -190,7 +207,7 @@ test_expect_success mark_unblamable_lines_intermediate '
 
 	sed -n "4p" blame_raw | cut -c1 >actual &&
 	test_cmp expect actual
-	'
+'
 
 # The heuristic called by guess_line_blames() tries to find the size of a
 # blame_entry 'e' in the parent's address space.  Those calculations need to
@@ -227,7 +244,7 @@ test_expect_success ignored_chunk_negative_parent_size '
 	git tag C &&
 
 	git blame file --ignore-rev B >blame_raw
-	'
+'
 
 # Resetting the repo and creating:
 #
@@ -262,13 +279,13 @@ test_expect_success ignore_merge '
 	test_merge M B &&
 	git blame --line-porcelain file --ignore-rev M >blame_raw &&
 
-	grep -E "^[0-9a-f]+ [0-9]+ 1" blame_raw | sed -e "s/ .*//" >actual &&
+	sed -ne "/^[0-9a-f][0-9a-f]* [0-9][0-9]* 1/s/ .*//p" blame_raw >actual &&
 	git rev-parse B >expect &&
 	test_cmp expect actual &&
 
-	grep -E "^[0-9a-f]+ [0-9]+ 9" blame_raw | sed -e "s/ .*//" >actual &&
+	sed -ne "/^[0-9a-f][0-9a-f]* [0-9][0-9]* 9/s/ .*//p" blame_raw >actual &&
 	git rev-parse C >expect &&
 	test_cmp expect actual
-	'
+'
 
 test_done
diff --git a/t/t8014-blame-ignore-fuzzy.sh b/t/t8014-blame-ignore-fuzzy.sh
index e68e611..0bd0341 100755
--- a/t/t8014-blame-ignore-fuzzy.sh
+++ b/t/t8014-blame-ignore-fuzzy.sh
@@ -310,7 +310,7 @@ test_expect_success setup '
 			echo "$line" >>"$i" &&
 			git add "$i" &&
 			test_tick &&
-			GIT_AUTHOR_NAME="$line_count" git commit -m "$line_count"
+			GIT_AUTHOR_NAME="$line_count" git commit -m "$line_count" || return 1
 		done <"a$i"
 	done &&
 
@@ -318,7 +318,7 @@ test_expect_success setup '
 	do
 		# Overwrite the files with the final content.
 		cp b$i $i &&
-		git add $i
+		git add $i || return 1
 	done &&
 	test_tick &&
 
diff --git a/t/t9001-send-email.sh b/t/t9001-send-email.sh
index 3d68570..5a77100 100755
--- a/t/t9001-send-email.sh
+++ b/t/t9001-send-email.sh
@@ -1,6 +1,10 @@
 #!/bin/sh
 
 test_description='git send-email'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # May be altered later in the test
@@ -8,7 +12,7 @@ PREREQ="PERL"
 
 replace_variable_fields () {
 	sed	-e "s/^\(Date:\).*/\1 DATE-STRING/" \
-		-e "s/^\(Message-Id:\).*/\1 MESSAGE-ID-STRING/" \
+		-e "s/^\(Message-ID:\).*/\1 MESSAGE-ID-STRING/" \
 		-e "s/^\(X-Mailer:\).*/\1 X-MAILER-STRING/"
 }
 
@@ -43,7 +47,7 @@ clean_fake_sendmail () {
 
 test_expect_success $PREREQ 'Extract patches' '
 	patches=$(git format-patch -s --cc="One <one@example.com>" --cc=two@example.com -n HEAD^1) &&
-	threaded_patches=$(git format-patch -o threaded -s --in-reply-to="format" HEAD^1)
+	threaded_patches=$(git format-patch -o threaded --thread=shallow -s --in-reply-to="format" HEAD^1)
 '
 
 # Test no confirm early to ensure remaining tests will not hang
@@ -57,8 +61,8 @@ test_no_confirm () {
 		--smtp-server="$(pwd)/fake.sendmail" \
 		$@ \
 		$patches >stdout &&
-		! grep "Send this email" stdout &&
-		>no_confirm_okay
+	! grep "Send this email" stdout &&
+	>no_confirm_okay
 }
 
 # Exit immediately to prevent hang if a no-confirm test fails
@@ -221,7 +225,7 @@ Cc: cc@example.com,
 	two@example.com
 Subject: [PATCH 1/1] Second.
 Date: DATE-STRING
-Message-Id: MESSAGE-ID-STRING
+Message-ID: MESSAGE-ID-STRING
 X-Mailer: X-MAILER-STRING
 In-Reply-To: <unique-message-id@example.com>
 References: <unique-message-id@example.com>
@@ -333,13 +337,14 @@ test_expect_success $PREREQ 'Show all headers' '
 test_expect_success $PREREQ 'Prompting works' '
 	clean_fake_sendmail &&
 	(echo "to@example.com" &&
-	 echo ""
+	 echo "my-message-id@example.com"
 	) | GIT_SEND_EMAIL_NOTTY=1 git send-email \
 		--smtp-server="$(pwd)/fake.sendmail" \
 		$patches \
 		2>errors &&
 		grep "^From: A U Thor <author@example.com>\$" msgtxt1 &&
-		grep "^To: to@example.com\$" msgtxt1
+		grep "^To: to@example.com\$" msgtxt1 &&
+		grep "^In-Reply-To: <my-message-id@example.com>" msgtxt1
 '
 
 test_expect_success $PREREQ,AUTOIDENT 'implicit ident is allowed' '
@@ -366,17 +371,20 @@ test_expect_success $PREREQ,!AUTOIDENT 'broken implicit ident aborts send-email'
 		--smtp-server="$(pwd)/fake.sendmail" \
 		--to=to@example.com \
 		$patches </dev/null 2>errors &&
-	test_i18ngrep "tell me who you are" errors
+	test_grep "tell me who you are" errors
 	)
 '
 
-test_expect_success $PREREQ 'setup tocmd and cccmd scripts' '
+test_expect_success $PREREQ 'setup cmd scripts' '
 	write_script tocmd-sed <<-\EOF &&
 	sed -n -e "s/^tocmd--//p" "$1"
 	EOF
-	write_script cccmd-sed <<-\EOF
+	write_script cccmd-sed <<-\EOF &&
 	sed -n -e "s/^cccmd--//p" "$1"
 	EOF
+	write_script headercmd-sed <<-\EOF
+	sed -n -e "s/^headercmd--//p" "$1"
+	EOF
 '
 
 test_expect_success $PREREQ 'tocmd works' '
@@ -406,21 +414,93 @@ test_expect_success $PREREQ 'cccmd works' '
 	grep "^	cccmd@example.com" msgtxt1
 '
 
+test_expect_success $PREREQ 'headercmd works' '
+	clean_fake_sendmail &&
+	cp $patches headercmd.patch &&
+	echo "headercmd--X-Debbugs-CC: dummy@example.com" >>headercmd.patch &&
+	git send-email \
+		--from="Example <nobody@example.com>" \
+		--to=nobody@example.com \
+		--header-cmd=./headercmd-sed \
+		--smtp-server="$(pwd)/fake.sendmail" \
+		headercmd.patch \
+		&&
+	grep "^X-Debbugs-CC: dummy@example.com" msgtxt1
+'
+
+test_expect_success $PREREQ '--no-header-cmd works' '
+	clean_fake_sendmail &&
+	cp $patches headercmd.patch &&
+	echo "headercmd--X-Debbugs-CC: dummy@example.com" >>headercmd.patch &&
+	git send-email \
+		--from="Example <nobody@example.com>" \
+		--to=nobody@example.com \
+		--header-cmd=./headercmd-sed \
+		--no-header-cmd \
+		--smtp-server="$(pwd)/fake.sendmail" \
+		headercmd.patch \
+		&&
+	! grep "^X-Debbugs-CC: dummy@example.com" msgtxt1
+'
+
+test_expect_success $PREREQ 'multiline fields are correctly unfolded' '
+	clean_fake_sendmail &&
+	cp $patches headercmd.patch &&
+	write_script headercmd-multiline <<-\EOF &&
+	echo "X-Debbugs-CC: someone@example.com
+FoldedField: This is a tale
+ best told using
+ multiple lines."
+	EOF
+	git send-email \
+		--from="Example <nobody@example.com>" \
+		--to=nobody@example.com \
+		--header-cmd=./headercmd-multiline \
+		--smtp-server="$(pwd)/fake.sendmail" \
+		headercmd.patch &&
+	grep "^FoldedField: This is a tale best told using multiple lines.$" msgtxt1
+'
+
+# Blank lines in the middle of the output of a command are invalid.
+test_expect_success $PREREQ 'malform output reported on blank lines in command output' '
+	clean_fake_sendmail &&
+	cp $patches headercmd.patch &&
+	write_script headercmd-malformed-output <<-\EOF &&
+	echo "X-Debbugs-CC: someone@example.com
+
+SomeOtherField: someone-else@example.com"
+	EOF
+	! git send-email \
+		--from="Example <nobody@example.com>" \
+		--to=nobody@example.com \
+		--header-cmd=./headercmd-malformed-output \
+		--smtp-server="$(pwd)/fake.sendmail" \
+		headercmd.patch
+'
+
 test_expect_success $PREREQ 'reject long lines' '
 	z8=zzzzzzzz &&
 	z64=$z8$z8$z8$z8$z8$z8$z8$z8 &&
 	z512=$z64$z64$z64$z64$z64$z64$z64$z64 &&
 	clean_fake_sendmail &&
 	cp $patches longline.patch &&
-	echo $z512$z512 >>longline.patch &&
+	cat >>longline.patch <<-EOF &&
+	$z512$z512
+	not a long line
+	$z512$z512
+	EOF
 	test_must_fail git send-email \
 		--from="Example <nobody@example.com>" \
 		--to=nobody@example.com \
 		--smtp-server="$(pwd)/fake.sendmail" \
 		--transfer-encoding=8bit \
 		$patches longline.patch \
-		2>errors &&
-	grep longline.patch errors
+		2>actual &&
+	cat >expect <<-\EOF &&
+	fatal: longline.patch:35 is longer than 998 characters
+	warning: no patches were sent
+	EOF
+	test_cmp expect actual
 '
 
 test_expect_success $PREREQ 'no patch was sent' '
@@ -510,6 +590,105 @@ do
 
 done
 
+test_expect_success $PREREQ "--validate respects relative core.hooksPath path" '
+	clean_fake_sendmail &&
+	mkdir my-hooks &&
+	test_when_finished "rm my-hooks.ran" &&
+	write_script my-hooks/sendemail-validate <<-\EOF &&
+	>my-hooks.ran
+	exit 1
+	EOF
+	test_config core.hooksPath "my-hooks" &&
+	test_must_fail git send-email \
+		--from="Example <nobody@example.com>" \
+		--to=nobody@example.com \
+		--smtp-server="$(pwd)/fake.sendmail" \
+		--validate \
+		longline.patch 2>actual &&
+	test_path_is_file my-hooks.ran &&
+	cat >expect <<-EOF &&
+	fatal: longline.patch: rejected by sendemail-validate hook
+	fatal: command '"'"'git hook run --ignore-missing sendemail-validate -- <patch> <header>'"'"' died with exit code 1
+	warning: no patches were sent
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success $PREREQ "--validate respects absolute core.hooksPath path" '
+	hooks_path="$(pwd)/my-hooks" &&
+	test_config core.hooksPath "$hooks_path" &&
+	test_when_finished "rm my-hooks.ran" &&
+	test_must_fail git send-email \
+		--from="Example <nobody@example.com>" \
+		--to=nobody@example.com \
+		--smtp-server="$(pwd)/fake.sendmail" \
+		--validate \
+		longline.patch 2>actual &&
+	test_path_is_file my-hooks.ran &&
+	cat >expect <<-EOF &&
+	fatal: longline.patch: rejected by sendemail-validate hook
+	fatal: command '"'"'git hook run --ignore-missing sendemail-validate -- <patch> <header>'"'"' died with exit code 1
+	warning: no patches were sent
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success $PREREQ "--validate hook supports multiple addresses in arguments" '
+	hooks_path="$(pwd)/my-hooks" &&
+	test_config core.hooksPath "$hooks_path" &&
+	test_when_finished "rm my-hooks.ran" &&
+	test_must_fail git send-email \
+		--from="Example <nobody@example.com>" \
+		--to=nobody@example.com,abc@example.com \
+		--smtp-server="$(pwd)/fake.sendmail" \
+		--validate \
+		longline.patch 2>actual &&
+	test_path_is_file my-hooks.ran &&
+	cat >expect <<-EOF &&
+	fatal: longline.patch: rejected by sendemail-validate hook
+	fatal: command '"'"'git hook run --ignore-missing sendemail-validate -- <patch> <header>'"'"' died with exit code 1
+	warning: no patches were sent
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success $PREREQ "--validate hook supports header argument" '
+	write_script my-hooks/sendemail-validate <<-\EOF &&
+	if test "$#" -ge 2
+	then
+		grep "X-test-header: v1.0" "$2"
+	else
+		echo "No header arg passed"
+		exit 1
+	fi
+	EOF
+	test_config core.hooksPath "my-hooks" &&
+	rm -fr outdir &&
+	git format-patch \
+		--add-header="X-test-header: v1.0" \
+		-n HEAD^1 -o outdir &&
+	git send-email \
+		--dry-run \
+		--to=nobody@example.com \
+		--smtp-server="$(pwd)/fake.sendmail" \
+		--validate \
+		outdir/000?-*.patch
+'
+
+test_expect_success $PREREQ 'clear message-id before parsing a new message' '
+	clean_fake_sendmail &&
+	echo true | write_script my-hooks/sendemail-validate &&
+	test_config core.hooksPath my-hooks &&
+	git send-email --validate --to=recipient@example.com \
+		--smtp-server="$(pwd)/fake.sendmail" \
+		$patches $threaded_patches &&
+	id0=$(grep "^Message-ID: " $threaded_patches) &&
+	id1=$(grep "^Message-ID: " msgtxt1) &&
+	id2=$(grep "^Message-ID: " msgtxt2) &&
+	test "z$id0" = "z$id2" &&
+	test "z$id1" != "z$id2"
+'
+
 for enc in 7bit 8bit quoted-printable base64
 do
 	test_expect_success $PREREQ "--transfer-encoding=$enc produces correct header" '
@@ -562,7 +741,7 @@ test_expect_success $PREREQ 'In-Reply-To without --chain-reply-to' '
 	sed -n -e "s/^In-Reply-To: *\(.*\)/\1/p" msgtxt1 >actual &&
 	test_cmp expect actual &&
 	# Second and subsequent messages are replies to the first one
-	sed -n -e "s/^Message-Id: *\(.*\)/\1/p" msgtxt1 >expect &&
+	sed -n -e "s/^Message-ID: *\(.*\)/\1/p" msgtxt1 >expect &&
 	sed -n -e "s/^In-Reply-To: *\(.*\)/\1/p" msgtxt2 >actual &&
 	test_cmp expect actual &&
 	sed -n -e "s/^In-Reply-To: *\(.*\)/\1/p" msgtxt3 >actual &&
@@ -582,22 +761,41 @@ test_expect_success $PREREQ 'In-Reply-To with --chain-reply-to' '
 		2>errors &&
 	sed -n -e "s/^In-Reply-To: *\(.*\)/\1/p" msgtxt1 >actual &&
 	test_cmp expect actual &&
-	sed -n -e "s/^Message-Id: *\(.*\)/\1/p" msgtxt1 >expect &&
+	sed -n -e "s/^Message-ID: *\(.*\)/\1/p" msgtxt1 >expect &&
 	sed -n -e "s/^In-Reply-To: *\(.*\)/\1/p" msgtxt2 >actual &&
 	test_cmp expect actual &&
-	sed -n -e "s/^Message-Id: *\(.*\)/\1/p" msgtxt2 >expect &&
+	sed -n -e "s/^Message-ID: *\(.*\)/\1/p" msgtxt2 >expect &&
 	sed -n -e "s/^In-Reply-To: *\(.*\)/\1/p" msgtxt3 >actual &&
 	test_cmp expect actual
 '
 
+test_set_editor "$(pwd)/fake-editor"
+
+test_expect_success $PREREQ 'setup erroring fake editor' '
+	write_script fake-editor <<-\EOF
+	echo >&2 "I am about to error"
+	exit 1
+	EOF
+'
+
+test_expect_success $PREREQ 'fake editor dies with error' '
+	clean_fake_sendmail &&
+	test_must_fail git send-email \
+		--compose --subject foo \
+		--from="Example <nobody@example.com>" \
+		--to=nobody@example.com \
+		--smtp-server="$(pwd)/fake.sendmail" \
+		$patches 2>err &&
+	grep "I am about to error" err &&
+	grep "the editor exited uncleanly, aborting everything" err
+'
+
 test_expect_success $PREREQ 'setup fake editor' '
 	write_script fake-editor <<-\EOF
 	echo fake edit >>"$1"
 	EOF
 '
 
-test_set_editor "$(pwd)/fake-editor"
-
 test_expect_success $PREREQ '--compose works' '
 	clean_fake_sendmail &&
 	git send-email \
@@ -639,7 +837,7 @@ Cc: cc@example.com,
 	two@example.com
 Subject: [PATCH 1/1] Second.
 Date: DATE-STRING
-Message-Id: MESSAGE-ID-STRING
+Message-ID: MESSAGE-ID-STRING
 X-Mailer: X-MAILER-STRING
 MIME-Version: 1.0
 Content-Transfer-Encoding: 8bit
@@ -685,7 +883,7 @@ Cc: A <author@example.com>,
 	two@example.com
 Subject: [PATCH 1/1] Second.
 Date: DATE-STRING
-Message-Id: MESSAGE-ID-STRING
+Message-ID: MESSAGE-ID-STRING
 X-Mailer: X-MAILER-STRING
 MIME-Version: 1.0
 Content-Transfer-Encoding: 8bit
@@ -722,7 +920,7 @@ Cc: A <author@example.com>,
 	C O Mitter <committer@example.com>
 Subject: [PATCH 1/1] Second.
 Date: DATE-STRING
-Message-Id: MESSAGE-ID-STRING
+Message-ID: MESSAGE-ID-STRING
 X-Mailer: X-MAILER-STRING
 MIME-Version: 1.0
 Content-Transfer-Encoding: 8bit
@@ -750,7 +948,7 @@ From: Example <from@example.com>
 To: to@example.com
 Subject: [PATCH 1/1] Second.
 Date: DATE-STRING
-Message-Id: MESSAGE-ID-STRING
+Message-ID: MESSAGE-ID-STRING
 X-Mailer: X-MAILER-STRING
 MIME-Version: 1.0
 Content-Transfer-Encoding: 8bit
@@ -786,7 +984,7 @@ Cc: A <author@example.com>,
 	cc-cmd@example.com
 Subject: [PATCH 1/1] Second.
 Date: DATE-STRING
-Message-Id: MESSAGE-ID-STRING
+Message-ID: MESSAGE-ID-STRING
 X-Mailer: X-MAILER-STRING
 MIME-Version: 1.0
 Content-Transfer-Encoding: 8bit
@@ -819,7 +1017,7 @@ Cc: A <author@example.com>,
 	two@example.com
 Subject: [PATCH 1/1] Second.
 Date: DATE-STRING
-Message-Id: MESSAGE-ID-STRING
+Message-ID: MESSAGE-ID-STRING
 X-Mailer: X-MAILER-STRING
 MIME-Version: 1.0
 Content-Transfer-Encoding: 8bit
@@ -852,7 +1050,7 @@ Cc: A <author@example.com>,
 	two@example.com
 Subject: [PATCH 1/1] Second.
 Date: DATE-STRING
-Message-Id: MESSAGE-ID-STRING
+Message-ID: MESSAGE-ID-STRING
 X-Mailer: X-MAILER-STRING
 MIME-Version: 1.0
 Content-Transfer-Encoding: 8bit
@@ -889,7 +1087,7 @@ Cc: A <author@example.com>,
 	C O Mitter <committer@example.com>
 Subject: [PATCH 1/1] Second.
 Date: DATE-STRING
-Message-Id: MESSAGE-ID-STRING
+Message-ID: MESSAGE-ID-STRING
 X-Mailer: X-MAILER-STRING
 MIME-Version: 1.0
 Content-Transfer-Encoding: 8bit
@@ -919,7 +1117,7 @@ Cc: A <author@example.com>,
 	C O Mitter <committer@example.com>
 Subject: [PATCH 1/1] Second.
 Date: DATE-STRING
-Message-Id: MESSAGE-ID-STRING
+Message-ID: MESSAGE-ID-STRING
 X-Mailer: X-MAILER-STRING
 MIME-Version: 1.0
 Content-Transfer-Encoding: 8bit
@@ -1168,10 +1366,10 @@ test_expect_success $PREREQ '--compose-encoding adds correct MIME for subject' '
 '
 
 test_expect_success $PREREQ 'detects ambiguous reference/file conflict' '
-	echo master >master &&
-	git add master &&
-	git commit -m"add master" &&
-	test_must_fail git send-email --dry-run master 2>errors &&
+	echo main >main &&
+	git add main &&
+	git commit -m"add main" &&
+	test_must_fail git send-email --dry-run main 2>errors &&
 	grep disambiguate errors
 '
 
@@ -1185,7 +1383,7 @@ test_expect_success $PREREQ 'feed two files' '
 		outdir/000?-*.patch 2>errors >out &&
 	grep "^Subject: " out >subjects &&
 	test "z$(sed -n -e 1p subjects)" = "zSubject: [PATCH 1/2] Second." &&
-	test "z$(sed -n -e 2p subjects)" = "zSubject: [PATCH 2/2] add master"
+	test "z$(sed -n -e 2p subjects)" = "zSubject: [PATCH 2/2] add main"
 '
 
 test_expect_success $PREREQ 'in-reply-to but no threading' '
@@ -1295,6 +1493,16 @@ test_expect_success $PREREQ 'sendemail.identity: bool variable fallback' '
 	! grep "X-Mailer" stdout
 '
 
+test_expect_success $PREREQ 'sendemail.identity: bool variable without a value' '
+	git -c sendemail.xmailer \
+		send-email \
+		--dry-run \
+		--from="nobody@example.com" \
+		$patches >stdout &&
+	grep "To: default@example.com" stdout &&
+	grep "X-Mailer" stdout
+'
+
 test_expect_success $PREREQ '--no-to overrides sendemail.to' '
 	git send-email \
 		--dry-run \
@@ -1394,7 +1602,7 @@ test_expect_success $PREREQ 'To headers from files reset each patch' '
 test_expect_success $PREREQ 'setup expect' '
 cat >email-using-8bit <<\EOF
 From fe6ecc66ece37198fe5db91fa2fc41d9f4fe5cc4 Mon Sep 17 00:00:00 2001
-Message-Id: <bogus-message-id@example.com>
+Message-ID: <bogus-message-id@example.com>
 From: author@example.com
 Date: Sat, 12 Jun 2010 15:53:58 +0200
 Subject: subject goes here
@@ -1435,7 +1643,7 @@ test_expect_success $PREREQ 'asks about and fixes 8bit encodings' '
 	grep "do not declare a Content-Transfer-Encoding" stdout &&
 	grep email-using-8bit stdout &&
 	grep "Which 8bit encoding" stdout &&
-	egrep "Content|MIME" msgtxt1 >actual &&
+	grep -E "Content|MIME" msgtxt1 >actual &&
 	test_cmp content-type-decl actual
 '
 
@@ -1446,7 +1654,22 @@ test_expect_success $PREREQ 'sendemail.8bitEncoding works' '
 	git send-email --from=author@example.com --to=nobody@example.com \
 			--smtp-server="$(pwd)/fake.sendmail" \
 			email-using-8bit >stdout &&
-	egrep "Content|MIME" msgtxt1 >actual &&
+	grep -E "Content|MIME" msgtxt1 >actual &&
+	test_cmp content-type-decl actual
+'
+
+test_expect_success $PREREQ 'sendemail.8bitEncoding in .git/config overrides --global .gitconfig' '
+	clean_fake_sendmail &&
+	git config sendemail.assume8bitEncoding UTF-8 &&
+	test_when_finished "rm -rf home" &&
+	mkdir home &&
+	git config -f home/.gitconfig sendemail.assume8bitEncoding "bogus too" &&
+	echo bogus |
+	env HOME="$(pwd)/home" DEBUG=1 \
+	git send-email --from=author@example.com --to=nobody@example.com \
+			--smtp-server="$(pwd)/fake.sendmail" \
+			email-using-8bit >stdout &&
+	grep -E "Content|MIME" msgtxt1 >actual &&
 	test_cmp content-type-decl actual
 '
 
@@ -1458,14 +1681,14 @@ test_expect_success $PREREQ '--8bit-encoding overrides sendemail.8bitEncoding' '
 			--smtp-server="$(pwd)/fake.sendmail" \
 			--8bit-encoding=UTF-8 \
 			email-using-8bit >stdout &&
-	egrep "Content|MIME" msgtxt1 >actual &&
+	grep -E "Content|MIME" msgtxt1 >actual &&
 	test_cmp content-type-decl actual
 '
 
 test_expect_success $PREREQ 'setup expect' '
 	cat >email-using-8bit <<-\EOF
 	From fe6ecc66ece37198fe5db91fa2fc41d9f4fe5cc4 Mon Sep 17 00:00:00 2001
-	Message-Id: <bogus-message-id@example.com>
+	Message-ID: <bogus-message-id@example.com>
 	From: author@example.com
 	Date: Sat, 12 Jun 2010 15:53:58 +0200
 	Subject: Dieser Betreff enthält auch einen Umlaut!
@@ -1494,7 +1717,7 @@ test_expect_success $PREREQ '--8bit-encoding also treats subject' '
 test_expect_success $PREREQ 'setup expect' '
 	cat >email-using-8bit <<-\EOF
 	From fe6ecc66ece37198fe5db91fa2fc41d9f4fe5cc4 Mon Sep 17 00:00:00 2001
-	Message-Id: <bogus-message-id@example.com>
+	Message-ID: <bogus-message-id@example.com>
 	From: A U Thor <author@example.com>
 	Date: Sat, 12 Jun 2010 15:53:58 +0200
 	Content-Type: text/plain; charset=UTF-8
@@ -1575,7 +1798,7 @@ test_expect_success $PREREQ '8-bit and sendemail.transferencoding=base64' '
 test_expect_success $PREREQ 'setup expect' '
 	cat >email-using-qp <<-\EOF
 	From fe6ecc66ece37198fe5db91fa2fc41d9f4fe5cc4 Mon Sep 17 00:00:00 2001
-	Message-Id: <bogus-message-id@example.com>
+	Message-ID: <bogus-message-id@example.com>
 	From: A U Thor <author@example.com>
 	Date: Sat, 12 Jun 2010 15:53:58 +0200
 	MIME-Version: 1.0
@@ -1601,7 +1824,7 @@ test_expect_success $PREREQ 'convert from quoted-printable to base64' '
 test_expect_success $PREREQ 'setup expect' "
 tr -d '\\015' | tr '%' '\\015' >email-using-crlf <<EOF
 From fe6ecc66ece37198fe5db91fa2fc41d9f4fe5cc4 Mon Sep 17 00:00:00 2001
-Message-Id: <bogus-message-id@example.com>
+Message-ID: <bogus-message-id@example.com>
 From: A U Thor <author@example.com>
 Date: Sat, 12 Jun 2010 15:53:58 +0200
 Content-Type: text/plain; charset=UTF-8
@@ -1756,7 +1979,7 @@ test_expect_success $PREREQ 'sendemail.aliasfiletype=mailrc' '
 	grep "^!somebody@example\.org!$" commandline1
 '
 
-test_expect_success $PREREQ 'sendemail.aliasfile=~/.mailrc' '
+test_expect_success $PREREQ 'sendemail.aliasesfile=~/.mailrc' '
 	clean_fake_sendmail &&
 	echo "alias sbd  someone@example.org" >"$HOME/.mailrc" &&
 	git config --replace-all sendemail.aliasesfile "~/.mailrc" &&
@@ -1858,7 +2081,7 @@ test_expect_success $PREREQ 'aliases and sendemail.identity' '
 		-c sendemail.aliasesfile=default-aliases \
 		-c sendemail.cloud.aliasesfile=cloud-aliases \
 		send-email -1 2>stderr &&
-	test_i18ngrep "cloud-aliases" stderr
+	test_grep "cloud-aliases" stderr
 '
 
 test_sendmail_aliases () {
@@ -2019,6 +2242,18 @@ test_expect_success $PREREQ '--[no-]xmailer with sendemail.xmailer=true' '
 	do_xmailer_test 1 "--xmailer"
 '
 
+test_expect_success $PREREQ '--[no-]xmailer with sendemail.xmailer' '
+	test_when_finished "test_unconfig sendemail.xmailer" &&
+	cat >>.git/config <<-\EOF &&
+	[sendemail]
+		xmailer
+	EOF
+	test_config sendemail.xmailer true &&
+	do_xmailer_test 1 "" &&
+	do_xmailer_test 0 "--no-xmailer" &&
+	do_xmailer_test 1 "--xmailer"
+'
+
 test_expect_success $PREREQ '--[no-]xmailer with sendemail.xmailer=false' '
 	test_config sendemail.xmailer false &&
 	do_xmailer_test 0 "" &&
@@ -2026,6 +2261,13 @@ test_expect_success $PREREQ '--[no-]xmailer with sendemail.xmailer=false' '
 	do_xmailer_test 1 "--xmailer"
 '
 
+test_expect_success $PREREQ '--[no-]xmailer with sendemail.xmailer=' '
+	test_config sendemail.xmailer "" &&
+	do_xmailer_test 0 "" &&
+	do_xmailer_test 0 "--no-xmailer" &&
+	do_xmailer_test 1 "--xmailer"
+'
+
 test_expect_success $PREREQ 'setup expected-list' '
 	git send-email \
 	--dry-run \
@@ -2037,7 +2279,7 @@ test_expect_success $PREREQ 'setup expected-list' '
 	--cc="Cc2 <cc2@example.com>" \
 	--bcc="bcc1@example.com" \
 	--bcc="bcc2@example.com" \
-	0001-add-master.patch | replace_variable_fields \
+	0001-add-main.patch | replace_variable_fields \
 	>expected-list
 '
 
@@ -2049,7 +2291,7 @@ test_expect_success $PREREQ 'use email list in --cc --to and --bcc' '
 	--to="to3@example.com" \
 	--cc="Cc 1 <cc1@example.com>, Cc2 <cc2@example.com>" \
 	--bcc="bcc1@example.com, bcc2@example.com" \
-	0001-add-master.patch | replace_variable_fields \
+	0001-add-main.patch | replace_variable_fields \
 	>actual-list &&
 	test_cmp expected-list actual-list
 '
@@ -2065,7 +2307,7 @@ test_expect_success $PREREQ 'aliases work with email list' '
 	--to="To 1 <to1@example.com>, to2, to3@example.com" \
 	--cc="cc1, Cc2 <cc2@example.com>" \
 	--bcc="bcc1@example.com, bcc2@example.com" \
-	0001-add-master.patch | replace_variable_fields \
+	0001-add-main.patch | replace_variable_fields \
 	>actual-list &&
 	test_cmp expected-list actual-list
 '
@@ -2089,15 +2331,89 @@ test_expect_success $PREREQ 'leading and trailing whitespaces are removed' '
 	--cc="Cc2 <cc2@example.com>" \
 	--bcc="$BCC1" \
 	--bcc="bcc2@example.com" \
-	0001-add-master.patch | replace_variable_fields \
+	0001-add-main.patch | replace_variable_fields \
 	>actual-list &&
 	test_cmp expected-list actual-list
 '
 
-test_expect_success $PREREQ 'invoke hook' '
-	mkdir -p .git/hooks &&
+test_expect_success $PREREQ 'test using command name with --sendmail-cmd' '
+	clean_fake_sendmail &&
+	PATH="$PWD:$PATH" \
+	git send-email \
+		--from="Example <nobody@example.com>" \
+		--to=nobody@example.com \
+		--sendmail-cmd="fake.sendmail" \
+		HEAD^ &&
+	test_path_is_file commandline1
+'
+
+test_expect_success $PREREQ 'test using arguments with --sendmail-cmd' '
+	clean_fake_sendmail &&
+	git send-email \
+		--from="Example <nobody@example.com>" \
+		--to=nobody@example.com \
+		--sendmail-cmd='\''"$(pwd)/fake.sendmail" -f nobody@example.com'\'' \
+		HEAD^ &&
+	test_path_is_file commandline1
+'
+
+test_expect_success $PREREQ 'test shell expression with --sendmail-cmd' '
+	clean_fake_sendmail &&
+	git send-email \
+		--from="Example <nobody@example.com>" \
+		--to=nobody@example.com \
+		--sendmail-cmd='\''f() { "$(pwd)/fake.sendmail" "$@"; };f'\'' \
+		HEAD^ &&
+	test_path_is_file commandline1
+'
+
+test_expect_success $PREREQ 'set up in-reply-to/references patches' '
+	cat >has-reply.patch <<-\EOF &&
+	From: A U Thor <author@example.com>
+	Subject: patch with in-reply-to
+	Message-ID: <patch.with.in.reply.to@example.com>
+	In-Reply-To: <replied.to@example.com>
+	References: <replied.to@example.com>
+
+	This is the body.
+	EOF
+	cat >no-reply.patch <<-\EOF
+	From: A U Thor <author@example.com>
+	Subject: patch without in-reply-to
+	Message-ID: <patch.without.in.reply.to@example.com>
+
+	This is the body.
+	EOF
+'
+
+test_expect_success $PREREQ 'patch reply headers correct with --no-thread' '
+	clean_fake_sendmail &&
+	git send-email \
+		--no-thread \
+		--to=nobody@example.com \
+		--smtp-server="$(pwd)/fake.sendmail" \
+		has-reply.patch no-reply.patch &&
+	grep "In-Reply-To: <replied.to@example.com>" msgtxt1 &&
+	grep "References: <replied.to@example.com>" msgtxt1 &&
+	! grep replied.to@example.com msgtxt2
+'
+
+test_expect_success $PREREQ 'cmdline in-reply-to used with --no-thread' '
+	clean_fake_sendmail &&
+	git send-email \
+		--no-thread \
+		--in-reply-to="<cmdline.reply@example.com>" \
+		--to=nobody@example.com \
+		--smtp-server="$(pwd)/fake.sendmail" \
+		has-reply.patch no-reply.patch &&
+	grep "In-Reply-To: <cmdline.reply@example.com>" msgtxt1 &&
+	grep "References: <cmdline.reply@example.com>" msgtxt1 &&
+	grep "In-Reply-To: <cmdline.reply@example.com>" msgtxt2 &&
+	grep "References: <cmdline.reply@example.com>" msgtxt2
+'
 
-	write_script .git/hooks/sendemail-validate <<-\EOF &&
+test_expect_success $PREREQ 'invoke hook' '
+	test_hook sendemail-validate <<-\EOF &&
 	# test that we have the correct environment variable, pwd, and
 	# argument
 	case "$GIT_DIR" in
@@ -2108,8 +2424,8 @@ test_expect_success $PREREQ 'invoke hook' '
 		false
 		;;
 	esac &&
-	test -f 0001-add-master.patch &&
-	grep "add master" "$1"
+	test -f 0001-add-main.patch &&
+	grep "add main" "$1"
 	EOF
 
 	mkdir subdir &&
@@ -2121,25 +2437,132 @@ test_expect_success $PREREQ 'invoke hook' '
 			--from="Example <nobody@example.com>" \
 			--to=nobody@example.com \
 			--smtp-server="$(pwd)/../fake.sendmail" \
-			../0001-add-master.patch &&
+			../0001-add-main.patch &&
 
 		# Verify error message when a patch is rejected by the hook
-		sed -e "s/add master/x/" ../0001-add-master.patch >../another.patch &&
+		sed -e "s/add main/x/" ../0001-add-main.patch >../another.patch &&
 		test_must_fail git send-email \
 			--from="Example <nobody@example.com>" \
 			--to=nobody@example.com \
 			--smtp-server="$(pwd)/../fake.sendmail" \
 			../another.patch 2>err &&
-		test_i18ngrep "rejected by sendemail-validate hook" err
+		test_grep "rejected by sendemail-validate hook" err
 	)
 '
 
+expected_file_counter_output () {
+	total=$1
+	count=0
+	while test $count -ne $total
+	do
+		count=$((count + 1)) &&
+		echo "$count/$total" || return
+	done
+}
+
+test_expect_success $PREREQ '--validate hook allows counting of messages' '
+	test_when_finished "rm -rf my-hooks.log" &&
+	test_config core.hooksPath "my-hooks" &&
+	mkdir -p my-hooks &&
+
+	write_script my-hooks/sendemail-validate <<-\EOF &&
+		num=$GIT_SENDEMAIL_FILE_COUNTER &&
+		tot=$GIT_SENDEMAIL_FILE_TOTAL &&
+		echo "$num/$tot" >>my-hooks.log || exit 1
+	EOF
+
+	>my-hooks.log &&
+	expected_file_counter_output 4 >expect &&
+	git send-email \
+		--from="Example <from@example.com>" \
+		--to=nobody@example.com \
+		--smtp-server="$(pwd)/fake.sendmail" \
+		--validate -3 --cover-letter --force &&
+	test_cmp expect my-hooks.log
+'
+
 test_expect_success $PREREQ 'test that send-email works outside a repo' '
 	nongit git send-email \
 		--from="Example <nobody@example.com>" \
 		--to=nobody@example.com \
 		--smtp-server="$(pwd)/fake.sendmail" \
-		"$(pwd)/0001-add-master.patch"
+		"$(pwd)/0001-add-main.patch"
+'
+
+test_expect_success $PREREQ 'send-email relays -v 3 to format-patch' '
+	test_when_finished "rm -f out" &&
+	git send-email --dry-run -v 3 -1 >out &&
+	grep "PATCH v3" out
+'
+
+test_expect_success $PREREQ 'test that sendmail config is rejected' '
+	test_config sendmail.program sendmail &&
+	test_must_fail git send-email \
+		--from="Example <nobody@example.com>" \
+		--to=nobody@example.com \
+		--smtp-server="$(pwd)/fake.sendmail" \
+		HEAD^ 2>err &&
+	test_grep "found configuration options for '"'"sendmail"'"'" err
+'
+
+test_expect_success $PREREQ 'test that sendmail config rejection is specific' '
+	test_config resendmail.program sendmail &&
+	git send-email \
+		--from="Example <nobody@example.com>" \
+		--to=nobody@example.com \
+		--smtp-server="$(pwd)/fake.sendmail" \
+		HEAD^
+'
+
+test_expect_success $PREREQ 'test forbidSendmailVariables behavior override' '
+	test_config sendmail.program sendmail &&
+	test_config sendemail.forbidSendmailVariables false &&
+	git send-email \
+		--from="Example <nobody@example.com>" \
+		--to=nobody@example.com \
+		--smtp-server="$(pwd)/fake.sendmail" \
+		HEAD^
+'
+
+test_expect_success $PREREQ '--compose handles lowercase headers' '
+	write_script fake-editor <<-\EOF &&
+	sed "s/^From:.*/from: edited-from@example.com/i" "$1" >"$1.tmp" &&
+	mv "$1.tmp" "$1"
+	EOF
+	clean_fake_sendmail &&
+	git send-email \
+		--compose \
+		--from="Example <from@example.com>" \
+		--to=nobody@example.com \
+		--smtp-server="$(pwd)/fake.sendmail" \
+		HEAD^ &&
+	grep "From: edited-from@example.com" msgtxt1
+'
+
+test_expect_success $PREREQ '--compose handles to headers' '
+	write_script fake-editor <<-\EOF &&
+	sed "s/^To: .*/&, edited-to@example.com/" <"$1" >"$1.tmp" &&
+	echo this is the body >>"$1.tmp" &&
+	mv "$1.tmp" "$1"
+	EOF
+	clean_fake_sendmail &&
+	GIT_SEND_EMAIL_NOTTY=1 \
+	git send-email \
+		--compose \
+		--from="Example <from@example.com>" \
+		--to=nobody@example.com \
+		--smtp-server="$(pwd)/fake.sendmail" \
+		HEAD^ &&
+	# Check both that the cover letter used our modified "to" line,
+	# but also that it was picked up for the patch.
+	q_to_tab >expect <<-\EOF &&
+	To: nobody@example.com,
+	Qedited-to@example.com
+	EOF
+	grep -A1 "^To:" msgtxt1 >msgtxt1.to &&
+	test_cmp expect msgtxt1.to &&
+	grep -A1 "^To:" msgtxt2 >msgtxt2.to &&
+	test_cmp expect msgtxt2.to
 '
 
 test_done
diff --git a/t/t9002-column.sh b/t/t9002-column.sh
index 8998352..d5b98e6 100755
--- a/t/t9002-column.sh
+++ b/t/t9002-column.sh
@@ -1,6 +1,7 @@
 #!/bin/sh
 
 test_description='git column'
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -42,6 +43,24 @@ EOF
 	test_cmp expected actual
 '
 
+test_expect_success '--nl' '
+	cat >expected <<\EOF &&
+oneZ
+twoZ
+threeZ
+fourZ
+fiveZ
+sixZ
+sevenZ
+eightZ
+nineZ
+tenZ
+elevenZ
+EOF
+	git column --nl="Z$LF" --mode=plain <lista >actual &&
+	test_cmp expected actual
+'
+
 test_expect_success '80 columns' '
 	cat >expected <<\EOF &&
 one    two    three  four   five   six    seven  eight  nine   ten    eleven
@@ -177,4 +196,15 @@ EOF
 	test_cmp expected actual
 '
 
+test_expect_success 'padding must be non-negative' '
+	cat >input <<\EOF &&
+1 2 3 4 5 6
+EOF
+	cat >expected <<\EOF &&
+fatal: --padding must be non-negative
+EOF
+	test_must_fail git column --mode=column --padding=-1 <input >actual 2>&1 &&
+	test_cmp expected actual
+'
+
 test_done
diff --git a/t/t9003-help-autocorrect.sh b/t/t9003-help-autocorrect.sh
index b1c7919..14a704d 100755
--- a/t/t9003-help-autocorrect.sh
+++ b/t/t9003-help-autocorrect.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='help.autocorrect finding a match'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -37,16 +39,33 @@ test_expect_success 'autocorrect showing candidates' '
 	grep "^	distimdistim" actual
 '
 
-test_expect_success 'autocorrect running commands' '
-	git config help.autocorrect -1 &&
+for immediate in -1 immediate
+do
+	test_expect_success 'autocorrect running commands' '
+		git config help.autocorrect $immediate &&
 
-	git lfg >actual &&
-	echo "a single log entry" >expect &&
-	test_cmp expect actual &&
+		git lfg >actual &&
+		echo "a single log entry" >expect &&
+		test_cmp expect actual &&
 
-	git distimdist >actual &&
-	echo "distimdistim was called" >expect &&
-	test_cmp expect actual
+		git distimdist >actual &&
+		echo "distimdistim was called" >expect &&
+		test_cmp expect actual
+	'
+done
+
+test_expect_success 'autocorrect can be declined altogether' '
+	git config help.autocorrect never &&
+
+	test_must_fail git lfg 2>actual &&
+	grep "is not a git command" actual &&
+	test_line_count = 1 actual
+'
+
+test_expect_success 'autocorrect works in work tree created from bare repo' '
+	git clone --bare . bare.git &&
+	git -C bare.git worktree add ../worktree &&
+	git -C worktree -c help.autocorrect=immediate stauts
 '
 
 test_done
diff --git a/t/t9004-example.sh b/t/t9004-example.sh
index 7e8894a..590aab0 100755
--- a/t/t9004-example.sh
+++ b/t/t9004-example.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='check that example code compiles and runs'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'decorate' '
diff --git a/t/t9010-svn-fe.sh b/t/t9010-svn-fe.sh
deleted file mode 100755
index 83f8f5c..0000000
--- a/t/t9010-svn-fe.sh
+++ /dev/null
@@ -1,1105 +0,0 @@
-#!/bin/sh
-
-test_description='check svn dumpfile importer'
-
-. ./test-lib.sh
-
-if test_have_prereq !PIPE
-then
-	skip_all="svn dumpfile importer testing requires the PIPE prerequisite"
-	test_done
-fi
-
-reinit_git () {
-	rm -fr .git &&
-	rm -f stream backflow &&
-	git init &&
-	mkfifo stream backflow
-}
-
-try_dump () {
-	input=$1 &&
-	maybe_fail_svnfe=${2:+test_$2} &&
-	maybe_fail_fi=${3:+test_$3} &&
-
-	{
-		$maybe_fail_svnfe test-svn-fe "$input" >stream 3<backflow &
-	} &&
-	$maybe_fail_fi git fast-import --cat-blob-fd=3 <stream 3>backflow &&
-	wait $!
-}
-
-properties () {
-	while test "$#" -ne 0
-	do
-		property="$1" &&
-		value="$2" &&
-		printf "%s\n" "K ${#property}" &&
-		printf "%s\n" "$property" &&
-		printf "%s\n" "V ${#value}" &&
-		printf "%s\n" "$value" &&
-		shift 2 ||
-		return 1
-	done
-}
-
-text_no_props () {
-	text="$1
-" &&
-	printf "%s\n" "Prop-content-length: 10" &&
-	printf "%s\n" "Text-content-length: ${#text}" &&
-	printf "%s\n" "Content-length: $((${#text} + 10))" &&
-	printf "%s\n" "" "PROPS-END" &&
-	printf "%s\n" "$text"
-}
-
-test_expect_success 'empty dump' '
-	reinit_git &&
-	echo "SVN-fs-dump-format-version: 2" >input &&
-	try_dump input
-'
-
-test_expect_success 'v4 dumps not supported' '
-	reinit_git &&
-	echo "SVN-fs-dump-format-version: 4" >v4.dump &&
-	try_dump v4.dump must_fail
-'
-
-test_expect_failure 'empty revision' '
-	reinit_git &&
-	printf "rev <nobody, nobody@local>: %s\n" "" "" >expect &&
-	cat >emptyrev.dump <<-\EOF &&
-	SVN-fs-dump-format-version: 3
-
-	Revision-number: 1
-	Prop-content-length: 0
-	Content-length: 0
-
-	Revision-number: 2
-	Prop-content-length: 0
-	Content-length: 0
-
-	EOF
-	try_dump emptyrev.dump &&
-	git log -p --format="rev <%an, %ae>: %s" HEAD >actual &&
-	test_cmp expect actual
-'
-
-test_expect_success 'empty properties' '
-	reinit_git &&
-	printf "rev <nobody, nobody@local>: %s\n" "" "" >expect &&
-	cat >emptyprop.dump <<-\EOF &&
-	SVN-fs-dump-format-version: 3
-
-	Revision-number: 1
-	Prop-content-length: 10
-	Content-length: 10
-
-	PROPS-END
-
-	Revision-number: 2
-	Prop-content-length: 10
-	Content-length: 10
-
-	PROPS-END
-	EOF
-	try_dump emptyprop.dump &&
-	git log -p --format="rev <%an, %ae>: %s" HEAD >actual &&
-	test_cmp expect actual
-'
-
-test_expect_success 'author name and commit message' '
-	reinit_git &&
-	echo "<author@example.com, author@example.com@local>" >expect.author &&
-	cat >message <<-\EOF &&
-	A concise summary of the change
-
-	A detailed description of the change, why it is needed, what
-	was broken and why applying this is the best course of action.
-
-	* file.c
-	    Details pertaining to an individual file.
-	EOF
-	{
-		properties \
-			svn:author author@example.com \
-			svn:log "$(cat message)" &&
-		echo PROPS-END
-	} >props &&
-	{
-		echo "SVN-fs-dump-format-version: 3" &&
-		echo &&
-		echo "Revision-number: 1" &&
-		echo Prop-content-length: $(wc -c <props) &&
-		echo Content-length: $(wc -c <props) &&
-		echo &&
-		cat props
-	} >log.dump &&
-	try_dump log.dump &&
-	git log -p --format="%B" HEAD >actual.log &&
-	git log --format="<%an, %ae>" >actual.author &&
-	test_cmp message actual.log &&
-	test_cmp expect.author actual.author
-'
-
-test_expect_success 'unsupported properties are ignored' '
-	reinit_git &&
-	echo author >expect &&
-	cat >extraprop.dump <<-\EOF &&
-	SVN-fs-dump-format-version: 3
-
-	Revision-number: 1
-	Prop-content-length: 56
-	Content-length: 56
-
-	K 8
-	nonsense
-	V 1
-	y
-	K 10
-	svn:author
-	V 6
-	author
-	PROPS-END
-	EOF
-	try_dump extraprop.dump &&
-	git log -p --format=%an HEAD >actual &&
-	test_cmp expect actual
-'
-
-test_expect_failure 'timestamp and empty file' '
-	echo author@example.com >expect.author &&
-	echo 1999-01-01 >expect.date &&
-	echo file >expect.files &&
-	reinit_git &&
-	{
-		properties \
-			svn:author author@example.com \
-			svn:date "1999-01-01T00:01:002.000000Z" \
-			svn:log "add empty file" &&
-		echo PROPS-END
-	} >props &&
-	{
-		cat <<-EOF &&
-		SVN-fs-dump-format-version: 3
-
-		Revision-number: 1
-		EOF
-		echo Prop-content-length: $(wc -c <props) &&
-		echo Content-length: $(wc -c <props) &&
-		echo &&
-		cat props &&
-		cat <<-\EOF
-
-		Node-path: empty-file
-		Node-kind: file
-		Node-action: add
-		Content-length: 0
-
-		EOF
-	} >emptyfile.dump &&
-	try_dump emptyfile.dump &&
-	git log --format=%an HEAD >actual.author &&
-	git log --date=short --format=%ad HEAD >actual.date &&
-	git ls-tree -r --name-only HEAD >actual.files &&
-	test_cmp expect.author actual.author &&
-	test_cmp expect.date actual.date &&
-	test_cmp expect.files actual.files &&
-	git checkout HEAD empty-file &&
-	test_must_be_empty file
-'
-
-test_expect_success 'directory with files' '
-	reinit_git &&
-	printf "%s\n" directory/file1 directory/file2 >expect.files &&
-	echo hi >hi &&
-	echo hello >hello &&
-	{
-		properties \
-			svn:author author@example.com \
-			svn:date "1999-02-01T00:01:002.000000Z" \
-			svn:log "add directory with some files in it" &&
-		echo PROPS-END
-	} >props &&
-	{
-		cat <<-EOF &&
-		SVN-fs-dump-format-version: 3
-
-		Revision-number: 1
-		EOF
-		echo Prop-content-length: $(wc -c <props) &&
-		echo Content-length: $(wc -c <props) &&
-		echo &&
-		cat props &&
-		cat <<-\EOF &&
-
-		Node-path: directory
-		Node-kind: dir
-		Node-action: add
-		Prop-content-length: 10
-		Content-length: 10
-
-		PROPS-END
-
-		Node-path: directory/file1
-		Node-kind: file
-		Node-action: add
-		EOF
-		text_no_props hello &&
-		cat <<-\EOF &&
-		Node-path: directory/file2
-		Node-kind: file
-		Node-action: add
-		EOF
-		text_no_props hi
-	} >directory.dump &&
-	try_dump directory.dump &&
-
-	git ls-tree -r --name-only HEAD >actual.files &&
-	git checkout HEAD directory &&
-	test_cmp expect.files actual.files &&
-	test_cmp hello directory/file1 &&
-	test_cmp hi directory/file2
-'
-
-test_expect_success 'branch name with backslash' '
-	reinit_git &&
-	sort <<-\EOF >expect.branch-files &&
-	trunk/file1
-	trunk/file2
-	"branches/UpdateFOPto094\\/file1"
-	"branches/UpdateFOPto094\\/file2"
-	EOF
-
-	echo hi >hi &&
-	echo hello >hello &&
-	{
-		properties \
-			svn:author author@example.com \
-			svn:date "1999-02-02T00:01:02.000000Z" \
-			svn:log "add directory with some files in it" &&
-		echo PROPS-END
-	} >props.setup &&
-	{
-		properties \
-			svn:author brancher@example.com \
-			svn:date "2007-12-06T21:38:34.000000Z" \
-			svn:log "Updating fop to .94 and adjust fo-stylesheets" &&
-		echo PROPS-END
-	} >props.branch &&
-	{
-		cat <<-EOF &&
-		SVN-fs-dump-format-version: 3
-
-		Revision-number: 1
-		EOF
-		echo Prop-content-length: $(wc -c <props.setup) &&
-		echo Content-length: $(wc -c <props.setup) &&
-		echo &&
-		cat props.setup &&
-		cat <<-\EOF &&
-
-		Node-path: trunk
-		Node-kind: dir
-		Node-action: add
-		Prop-content-length: 10
-		Content-length: 10
-
-		PROPS-END
-
-		Node-path: branches
-		Node-kind: dir
-		Node-action: add
-		Prop-content-length: 10
-		Content-length: 10
-
-		PROPS-END
-
-		Node-path: trunk/file1
-		Node-kind: file
-		Node-action: add
-		EOF
-		text_no_props hello &&
-		cat <<-\EOF &&
-		Node-path: trunk/file2
-		Node-kind: file
-		Node-action: add
-		EOF
-		text_no_props hi &&
-		cat <<-\EOF &&
-
-		Revision-number: 2
-		EOF
-		echo Prop-content-length: $(wc -c <props.branch) &&
-		echo Content-length: $(wc -c <props.branch) &&
-		echo &&
-		cat props.branch &&
-		cat <<-\EOF
-
-		Node-path: branches/UpdateFOPto094\
-		Node-kind: dir
-		Node-action: add
-		Node-copyfrom-rev: 1
-		Node-copyfrom-path: trunk
-
-		Node-kind: dir
-		Node-action: add
-		Prop-content-length: 34
-		Content-length: 34
-
-		K 13
-		svn:mergeinfo
-		V 0
-
-		PROPS-END
-		EOF
-	} >branch.dump &&
-	try_dump branch.dump &&
-
-	git ls-tree -r --name-only HEAD |
-	sort >actual.branch-files &&
-	test_cmp expect.branch-files actual.branch-files
-'
-
-test_expect_success 'node without action' '
-	reinit_git &&
-	cat >inaction.dump <<-\EOF &&
-	SVN-fs-dump-format-version: 3
-
-	Revision-number: 1
-	Prop-content-length: 10
-	Content-length: 10
-
-	PROPS-END
-
-	Node-path: directory
-	Node-kind: dir
-	Prop-content-length: 10
-	Content-length: 10
-
-	PROPS-END
-	EOF
-	try_dump inaction.dump must_fail
-'
-
-test_expect_success 'action: add node without text' '
-	reinit_git &&
-	cat >textless.dump <<-\EOF &&
-	SVN-fs-dump-format-version: 3
-
-	Revision-number: 1
-	Prop-content-length: 10
-	Content-length: 10
-
-	PROPS-END
-
-	Node-path: textless
-	Node-kind: file
-	Node-action: add
-	Prop-content-length: 10
-	Content-length: 10
-
-	PROPS-END
-	EOF
-	try_dump textless.dump must_fail
-'
-
-test_expect_failure 'change file mode but keep old content' '
-	reinit_git &&
-	cat >expect <<-\EOF &&
-	OBJID
-	:120000 100644 OBJID OBJID T	greeting
-	OBJID
-	:100644 120000 OBJID OBJID T	greeting
-	OBJID
-	:000000 100644 OBJID OBJID A	greeting
-	EOF
-	echo "link hello" >expect.blob &&
-	echo hello >hello &&
-	cat >filemode.dump <<-\EOF &&
-	SVN-fs-dump-format-version: 3
-
-	Revision-number: 1
-	Prop-content-length: 10
-	Content-length: 10
-
-	PROPS-END
-
-	Node-path: greeting
-	Node-kind: file
-	Node-action: add
-	Prop-content-length: 10
-	Text-content-length: 11
-	Content-length: 21
-
-	PROPS-END
-	link hello
-
-	Revision-number: 2
-	Prop-content-length: 10
-	Content-length: 10
-
-	PROPS-END
-
-	Node-path: greeting
-	Node-kind: file
-	Node-action: change
-	Prop-content-length: 33
-	Content-length: 33
-
-	K 11
-	svn:special
-	V 1
-	*
-	PROPS-END
-
-	Revision-number: 3
-	Prop-content-length: 10
-	Content-length: 10
-
-	PROPS-END
-
-	Node-path: greeting
-	Node-kind: file
-	Node-action: change
-	Prop-content-length: 10
-	Content-length: 10
-
-	PROPS-END
-	EOF
-	try_dump filemode.dump &&
-	{
-		git rev-list HEAD |
-		git diff-tree --root --stdin |
-		sed "s/$OID_REGEX/OBJID/g"
-	} >actual &&
-	git show HEAD:greeting >actual.blob &&
-	git show HEAD^:greeting >actual.target &&
-	test_cmp expect actual &&
-	test_cmp expect.blob actual.blob &&
-	test_cmp hello actual.target
-'
-
-test_expect_success 'NUL in property value' '
-	reinit_git &&
-	echo "commit message" >expect.message &&
-	{
-		properties \
-			unimportant "something with a NUL (Q)" \
-			svn:log "commit message" &&
-		echo PROPS-END
-	} |
-	q_to_nul >props &&
-	{
-		cat <<-\EOF &&
-		SVN-fs-dump-format-version: 3
-
-		Revision-number: 1
-		EOF
-		echo Prop-content-length: $(wc -c <props) &&
-		echo Content-length: $(wc -c <props) &&
-		echo &&
-		cat props
-	} >nulprop.dump &&
-	try_dump nulprop.dump &&
-	git diff-tree --always -s --format=%s HEAD >actual.message &&
-	test_cmp expect.message actual.message
-'
-
-test_expect_success 'NUL in log message, file content, and property name' '
-	# Caveat: svnadmin 1.6.16 (r1073529) truncates at \0 in the
-	# svn:specialQnotreally example.
-	reinit_git &&
-	cat >expect <<-\EOF &&
-	OBJID
-	:100644 100644 OBJID OBJID M	greeting
-	OBJID
-	:000000 100644 OBJID OBJID A	greeting
-	EOF
-	printf "\n%s\n" "something with an ASCII NUL (Q)" >expect.message &&
-	printf "%s\n" "helQo" >expect.hello1 &&
-	printf "%s\n" "link hello" >expect.hello2 &&
-	{
-		properties svn:log "something with an ASCII NUL (Q)" &&
-		echo PROPS-END
-	} |
-	q_to_nul >props &&
-	{
-		q_to_nul <<-\EOF &&
-		SVN-fs-dump-format-version: 3
-
-		Revision-number: 1
-		Prop-content-length: 10
-		Content-length: 10
-
-		PROPS-END
-
-		Node-path: greeting
-		Node-kind: file
-		Node-action: add
-		Prop-content-length: 10
-		Text-content-length: 6
-		Content-length: 16
-
-		PROPS-END
-		helQo
-
-		Revision-number: 2
-		EOF
-		echo Prop-content-length: $(wc -c <props) &&
-		echo Content-length: $(wc -c <props) &&
-		echo &&
-		cat props &&
-		q_to_nul <<-\EOF
-
-		Node-path: greeting
-		Node-kind: file
-		Node-action: change
-		Prop-content-length: 43
-		Text-content-length: 11
-		Content-length: 54
-
-		K 21
-		svn:specialQnotreally
-		V 1
-		*
-		PROPS-END
-		link hello
-		EOF
-	} >8bitclean.dump &&
-	try_dump 8bitclean.dump &&
-	{
-		git rev-list HEAD |
-		git diff-tree --root --stdin |
-		sed "s/$OID_REGEX/OBJID/g"
-	} >actual &&
-	{
-		git cat-file commit HEAD | nul_to_q &&
-		echo
-	} |
-	sed -ne "/^\$/,\$ p" >actual.message &&
-	git cat-file blob HEAD^:greeting | nul_to_q >actual.hello1 &&
-	git cat-file blob HEAD:greeting | nul_to_q >actual.hello2 &&
-	test_cmp expect actual &&
-	test_cmp expect.message actual.message &&
-	test_cmp expect.hello1 actual.hello1 &&
-	test_cmp expect.hello2 actual.hello2
-'
-
-test_expect_success 'change file mode and reiterate content' '
-	reinit_git &&
-	cat >expect <<-\EOF &&
-	OBJID
-	:120000 100644 OBJID OBJID T	greeting
-	OBJID
-	:100644 120000 OBJID OBJID T	greeting
-	OBJID
-	:000000 100644 OBJID OBJID A	greeting
-	EOF
-	echo "link hello" >expect.blob &&
-	echo hello >hello &&
-	cat >filemode2.dump <<-\EOF &&
-	SVN-fs-dump-format-version: 3
-
-	Revision-number: 1
-	Prop-content-length: 10
-	Content-length: 10
-
-	PROPS-END
-
-	Node-path: greeting
-	Node-kind: file
-	Node-action: add
-	Prop-content-length: 10
-	Text-content-length: 11
-	Content-length: 21
-
-	PROPS-END
-	link hello
-
-	Revision-number: 2
-	Prop-content-length: 10
-	Content-length: 10
-
-	PROPS-END
-
-	Node-path: greeting
-	Node-kind: file
-	Node-action: change
-	Prop-content-length: 33
-	Text-content-length: 11
-	Content-length: 44
-
-	K 11
-	svn:special
-	V 1
-	*
-	PROPS-END
-	link hello
-
-	Revision-number: 3
-	Prop-content-length: 10
-	Content-length: 10
-
-	PROPS-END
-
-	Node-path: greeting
-	Node-kind: file
-	Node-action: change
-	Prop-content-length: 10
-	Text-content-length: 11
-	Content-length: 21
-
-	PROPS-END
-	link hello
-	EOF
-	try_dump filemode2.dump &&
-	{
-		git rev-list HEAD |
-		git diff-tree --root --stdin |
-		sed "s/$OID_REGEX/OBJID/g"
-	} >actual &&
-	git show HEAD:greeting >actual.blob &&
-	git show HEAD^:greeting >actual.target &&
-	test_cmp expect actual &&
-	test_cmp expect.blob actual.blob &&
-	test_cmp hello actual.target
-'
-
-test_expect_success 'deltas supported' '
-	reinit_git &&
-	{
-		# (old) h + (inline) ello + (old) \n
-		printf "SVNQ%b%b%s" "Q\003\006\005\004" "\001Q\0204\001\002" "ello" |
-		q_to_nul
-	} >delta &&
-	{
-		properties \
-			svn:author author@example.com \
-			svn:date "1999-01-05T00:01:002.000000Z" \
-			svn:log "add greeting" &&
-		echo PROPS-END
-	} >props &&
-	{
-		properties \
-			svn:author author@example.com \
-			svn:date "1999-01-06T00:01:002.000000Z" \
-			svn:log "change it" &&
-		echo PROPS-END
-	} >props2 &&
-	{
-		echo SVN-fs-dump-format-version: 3 &&
-		echo &&
-		echo Revision-number: 1 &&
-		echo Prop-content-length: $(wc -c <props) &&
-		echo Content-length: $(wc -c <props) &&
-		echo &&
-		cat props &&
-		cat <<-\EOF &&
-
-		Node-path: hello
-		Node-kind: file
-		Node-action: add
-		Prop-content-length: 10
-		Text-content-length: 3
-		Content-length: 13
-
-		PROPS-END
-		hi
-
-		EOF
-		echo Revision-number: 2 &&
-		echo Prop-content-length: $(wc -c <props2) &&
-		echo Content-length: $(wc -c <props2) &&
-		echo &&
-		cat props2 &&
-		cat <<-\EOF &&
-
-		Node-path: hello
-		Node-kind: file
-		Node-action: change
-		Text-delta: true
-		Prop-content-length: 10
-		EOF
-		echo Text-content-length: $(wc -c <delta) &&
-		echo Content-length: $((10 + $(wc -c <delta))) &&
-		echo &&
-		echo PROPS-END &&
-		cat delta
-	} >delta.dump &&
-	try_dump delta.dump
-'
-
-test_expect_success 'property deltas supported' '
-	reinit_git &&
-	cat >expect <<-\EOF &&
-	OBJID
-	:100755 100644 OBJID OBJID M	script.sh
-	EOF
-	{
-		properties \
-			svn:author author@example.com \
-			svn:date "1999-03-06T00:01:002.000000Z" \
-			svn:log "make an executable, or chmod -x it" &&
-		echo PROPS-END
-	} >revprops &&
-	{
-		echo SVN-fs-dump-format-version: 3 &&
-		echo &&
-		echo Revision-number: 1 &&
-		echo Prop-content-length: $(wc -c <revprops) &&
-		echo Content-length: $(wc -c <revprops) &&
-		echo &&
-		cat revprops &&
-		echo &&
-		cat <<-\EOF &&
-		Node-path: script.sh
-		Node-kind: file
-		Node-action: add
-		Text-content-length: 0
-		Prop-content-length: 39
-		Content-length: 39
-
-		K 14
-		svn:executable
-		V 4
-		true
-		PROPS-END
-
-		EOF
-		echo Revision-number: 2 &&
-		echo Prop-content-length: $(wc -c <revprops) &&
-		echo Content-length: $(wc -c <revprops) &&
-		echo &&
-		cat revprops &&
-		echo &&
-		cat <<-\EOF
-		Node-path: script.sh
-		Node-kind: file
-		Node-action: change
-		Prop-delta: true
-		Prop-content-length: 30
-		Content-length: 30
-
-		D 14
-		svn:executable
-		PROPS-END
-		EOF
-	} >propdelta.dump &&
-	try_dump propdelta.dump &&
-	{
-		git rev-list HEAD |
-		git diff-tree --stdin |
-		sed "s/$OID_REGEX/OBJID/g"
-	} >actual &&
-	test_cmp expect actual
-'
-
-test_expect_success 'properties on /' '
-	reinit_git &&
-	cat <<-\EOF >expect &&
-	OBJID
-	OBJID
-	:000000 100644 OBJID OBJID A	greeting
-	EOF
-	sed -e "s/X$//" <<-\EOF >changeroot.dump &&
-	SVN-fs-dump-format-version: 3
-
-	Revision-number: 1
-	Prop-content-length: 10
-	Content-length: 10
-
-	PROPS-END
-
-	Node-path: greeting
-	Node-kind: file
-	Node-action: add
-	Text-content-length: 0
-	Prop-content-length: 10
-	Content-length: 10
-
-	PROPS-END
-
-	Revision-number: 2
-	Prop-content-length: 10
-	Content-length: 10
-
-	PROPS-END
-
-	Node-path: X
-	Node-kind: dir
-	Node-action: change
-	Prop-delta: true
-	Prop-content-length: 43
-	Content-length: 43
-
-	K 10
-	svn:ignore
-	V 11
-	build-area
-
-	PROPS-END
-	EOF
-	try_dump changeroot.dump &&
-	{
-		git rev-list HEAD |
-		git diff-tree --root --always --stdin |
-		sed "s/$OID_REGEX/OBJID/g"
-	} >actual &&
-	test_cmp expect actual
-'
-
-test_expect_success 'deltas for typechange' '
-	reinit_git &&
-	cat >expect <<-\EOF &&
-	OBJID
-	:120000 100644 OBJID OBJID T	test-file
-	OBJID
-	:100755 120000 OBJID OBJID T	test-file
-	OBJID
-	:000000 100755 OBJID OBJID A	test-file
-	EOF
-	cat >deleteprop.dump <<-\EOF &&
-	SVN-fs-dump-format-version: 3
-
-	Revision-number: 1
-	Prop-content-length: 10
-	Content-length: 10
-
-	PROPS-END
-
-	Node-path: test-file
-	Node-kind: file
-	Node-action: add
-	Prop-delta: true
-	Prop-content-length: 35
-	Text-content-length: 17
-	Content-length: 52
-
-	K 14
-	svn:executable
-	V 0
-
-	PROPS-END
-	link testing 123
-
-	Revision-number: 2
-	Prop-content-length: 10
-	Content-length: 10
-
-	PROPS-END
-
-	Node-path: test-file
-	Node-kind: file
-	Node-action: change
-	Prop-delta: true
-	Prop-content-length: 53
-	Text-content-length: 17
-	Content-length: 70
-
-	K 11
-	svn:special
-	V 1
-	*
-	D 14
-	svn:executable
-	PROPS-END
-	link testing 231
-
-	Revision-number: 3
-	Prop-content-length: 10
-	Content-length: 10
-
-	PROPS-END
-
-	Node-path: test-file
-	Node-kind: file
-	Node-action: change
-	Prop-delta: true
-	Prop-content-length: 27
-	Text-content-length: 17
-	Content-length: 44
-
-	D 11
-	svn:special
-	PROPS-END
-	link testing 321
-	EOF
-	try_dump deleteprop.dump &&
-	{
-		git rev-list HEAD |
-		git diff-tree --root --stdin |
-		sed "s/$OID_REGEX/OBJID/g"
-	} >actual &&
-	test_cmp expect actual
-'
-
-test_expect_success 'deltas need not consume the whole preimage' '
-	reinit_git &&
-	cat >expect <<-\EOF &&
-	OBJID
-	:120000 100644 OBJID OBJID T	postimage
-	OBJID
-	:100644 120000 OBJID OBJID T	postimage
-	OBJID
-	:000000 100644 OBJID OBJID A	postimage
-	EOF
-	echo "first preimage" >expect.1 &&
-	printf target >expect.2 &&
-	printf lnk >expect.3 &&
-	{
-		printf "SVNQ%b%b%b" "QQ\017\001\017" "\0217" "first preimage\n" |
-		q_to_nul
-	} >delta.1 &&
-	{
-		properties svn:special "*" &&
-		echo PROPS-END
-	} >symlink.props &&
-	{
-		printf "SVNQ%b%b%b" "Q\002\013\004\012" "\0201\001\001\0211" "lnk target" |
-		q_to_nul
-	} >delta.2 &&
-	{
-		printf "SVNQ%b%b" "Q\004\003\004Q" "\001Q\002\002" |
-		q_to_nul
-	} >delta.3 &&
-	{
-		cat <<-\EOF &&
-		SVN-fs-dump-format-version: 3
-
-		Revision-number: 1
-		Prop-content-length: 10
-		Content-length: 10
-
-		PROPS-END
-
-		Node-path: postimage
-		Node-kind: file
-		Node-action: add
-		Text-delta: true
-		Prop-content-length: 10
-		EOF
-		echo Text-content-length: $(wc -c <delta.1) &&
-		echo Content-length: $((10 + $(wc -c <delta.1))) &&
-		echo &&
-		echo PROPS-END &&
-		cat delta.1 &&
-		cat <<-\EOF &&
-
-		Revision-number: 2
-		Prop-content-length: 10
-		Content-length: 10
-
-		PROPS-END
-
-		Node-path: postimage
-		Node-kind: file
-		Node-action: change
-		Text-delta: true
-		EOF
-		echo Prop-content-length: $(wc -c <symlink.props) &&
-		echo Text-content-length: $(wc -c <delta.2) &&
-		echo Content-length: $(($(wc -c <symlink.props) + $(wc -c <delta.2))) &&
-		echo &&
-		cat symlink.props &&
-		cat delta.2 &&
-		cat <<-\EOF &&
-
-		Revision-number: 3
-		Prop-content-length: 10
-		Content-length: 10
-
-		PROPS-END
-
-		Node-path: postimage
-		Node-kind: file
-		Node-action: change
-		Text-delta: true
-		Prop-content-length: 10
-		EOF
-		echo Text-content-length: $(wc -c <delta.3) &&
-		echo Content-length: $((10 + $(wc -c <delta.3))) &&
-		echo &&
-		echo PROPS-END &&
-		cat delta.3 &&
-		echo
-	} >deltapartial.dump &&
-	try_dump deltapartial.dump &&
-	{
-		git rev-list HEAD |
-		git diff-tree --root --stdin |
-		sed "s/$OID_REGEX/OBJID/g"
-	} >actual &&
-	test_cmp expect actual &&
-	git show HEAD:postimage >actual.3 &&
-	git show HEAD^:postimage >actual.2 &&
-	git show HEAD^^:postimage >actual.1 &&
-	test_cmp expect.1 actual.1 &&
-	test_cmp expect.2 actual.2 &&
-	test_cmp expect.3 actual.3
-'
-
-test_expect_success 'no hang for delta trying to read past end of preimage' '
-	reinit_git &&
-	{
-		# COPY 1
-		printf "SVNQ%b%b" "Q\001\001\002Q" "\001Q" |
-		q_to_nul
-	} >greedy.delta &&
-	{
-		cat <<-\EOF &&
-		SVN-fs-dump-format-version: 3
-
-		Revision-number: 1
-		Prop-content-length: 10
-		Content-length: 10
-
-		PROPS-END
-
-		Node-path: bootstrap
-		Node-kind: file
-		Node-action: add
-		Text-delta: true
-		Prop-content-length: 10
-		EOF
-		echo Text-content-length: $(wc -c <greedy.delta) &&
-		echo Content-length: $((10 + $(wc -c <greedy.delta))) &&
-		echo &&
-		echo PROPS-END &&
-		cat greedy.delta &&
-		echo
-	} >greedydelta.dump &&
-	try_dump greedydelta.dump must_fail might_fail
-'
-
-test_expect_success 'set up svn repo' '
-	svnconf=$PWD/svnconf &&
-	mkdir -p "$svnconf" &&
-
-	if
-		svnadmin -h >/dev/null 2>&1 &&
-		svnadmin create simple-svn &&
-		svnadmin load simple-svn <"$TEST_DIRECTORY/t9135/svn.dump" &&
-		svn export --config-dir "$svnconf" "file://$PWD/simple-svn" simple-svnco
-	then
-		test_set_prereq SVNREPO
-	fi
-'
-
-test_expect_success SVNREPO 't9135/svn.dump' '
-	mkdir -p simple-git &&
-	(
-		cd simple-git &&
-		reinit_git &&
-		try_dump "$TEST_DIRECTORY/t9135/svn.dump"
-	) &&
-	(
-		cd simple-svnco &&
-		git init &&
-		git add . &&
-		git fetch ../simple-git master &&
-		git diff --exit-code FETCH_HEAD
-	)
-'
-
-test_done
diff --git a/t/t9011-svn-da.sh b/t/t9011-svn-da.sh
deleted file mode 100755
index ab1ef28..0000000
--- a/t/t9011-svn-da.sh
+++ /dev/null
@@ -1,248 +0,0 @@
-#!/bin/sh
-
-test_description='test parsing of svndiff0 files
-
-Using the "test-svn-fe -d" helper, check that svn-fe correctly
-interprets deltas using various facilities (some from the spec,
-some only learned from practice).
-'
-. ./test-lib.sh
-
->empty
-printf foo >preimage
-
-test_expect_success 'reject empty delta' '
-	test_must_fail test-svn-fe -d preimage empty 0
-'
-
-test_expect_success 'delta can empty file' '
-	printf "SVNQ" | q_to_nul >clear.delta &&
-	test-svn-fe -d preimage clear.delta 4 >actual &&
-	test_must_be_empty actual
-'
-
-test_expect_success 'reject svndiff2' '
-	printf "SVN\002" >bad.filetype &&
-	test_must_fail test-svn-fe -d preimage bad.filetype 4
-'
-
-test_expect_success 'one-window empty delta' '
-	printf "SVNQ%s" "QQQQQ" | q_to_nul >clear.onewindow &&
-	test-svn-fe -d preimage clear.onewindow 9 >actual &&
-	test_must_be_empty actual
-'
-
-test_expect_success 'reject incomplete window header' '
-	printf "SVNQ%s" "QQQQQ" | q_to_nul >clear.onewindow &&
-	printf "SVNQ%s" "QQ" | q_to_nul >clear.partialwindow &&
-	test_must_fail test-svn-fe -d preimage clear.onewindow 6 &&
-	test_must_fail test-svn-fe -d preimage clear.partialwindow 6
-'
-
-test_expect_success 'reject declared delta longer than actual delta' '
-	printf "SVNQ%s" "QQQQQ" | q_to_nul >clear.onewindow &&
-	printf "SVNQ%s" "QQ" | q_to_nul >clear.partialwindow &&
-	test_must_fail test-svn-fe -d preimage clear.onewindow 14 &&
-	test_must_fail test-svn-fe -d preimage clear.partialwindow 9
-'
-
-test_expect_success 'two-window empty delta' '
-	printf "SVNQ%s%s" "QQQQQ" "QQQQQ" | q_to_nul >clear.twowindow &&
-	test-svn-fe -d preimage clear.twowindow 14 >actual &&
-	test_must_fail test-svn-fe -d preimage clear.twowindow 13 &&
-	test_must_be_empty actual
-'
-
-test_expect_success 'noisy zeroes' '
-	printf "SVNQ%s" \
-		"RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRQQQQQ" |
-		tr R "\200" |
-		q_to_nul >clear.noisy &&
-	len=$(wc -c <clear.noisy) &&
-	test-svn-fe -d preimage clear.noisy $len &&
-	test_must_be_empty actual
-'
-
-test_expect_success 'reject variable-length int in magic' '
-	printf "SVNRQ" | tr R "\200" | q_to_nul >clear.badmagic &&
-	test_must_fail test-svn-fe -d preimage clear.badmagic 5
-'
-
-test_expect_success 'reject truncated integer' '
-	printf "SVNQ%s%s" "QQQQQ" "QQQQRRQ" |
-		tr R "\200" |
-		q_to_nul >clear.fullint &&
-	printf "SVNQ%s%s" "QQQQQ" "QQQQRR" |
-		tr RT "\201" |
-		q_to_nul >clear.partialint &&
-	test_must_fail test-svn-fe -d preimage clear.fullint 15 &&
-	test-svn-fe -d preimage clear.fullint 16 &&
-	test_must_fail test-svn-fe -d preimage clear.partialint 15
-'
-
-test_expect_success 'nonempty (but unused) preimage view' '
-	printf "SVNQ%b" "Q\003QQQ" | q_to_nul >clear.readpreimage &&
-	test-svn-fe -d preimage clear.readpreimage 9 >actual &&
-	test_must_be_empty actual
-'
-
-test_expect_success 'preimage view: right endpoint cannot backtrack' '
-	printf "SVNQ%b%b" "Q\003QQQ" "Q\002QQQ" |
-		q_to_nul >clear.backtrack &&
-	test_must_fail test-svn-fe -d preimage clear.backtrack 14
-'
-
-test_expect_success 'preimage view: left endpoint can advance' '
-	printf "SVNQ%b%b" "Q\003QQQ" "\001\002QQQ" |
-		q_to_nul >clear.preshrink &&
-	printf "SVNQ%b%b" "Q\003QQQ" "\001\001QQQ" |
-		q_to_nul >clear.shrinkbacktrack &&
-	test-svn-fe -d preimage clear.preshrink 14 >actual &&
-	test_must_fail test-svn-fe -d preimage clear.shrinkbacktrack 14 &&
-	test_must_be_empty actual
-'
-
-test_expect_success 'preimage view: offsets compared by value' '
-	printf "SVNQ%b%b" "\001\001QQQ" "\0200Q\003QQQ" |
-		q_to_nul >clear.noisybacktrack &&
-	printf "SVNQ%b%b" "\001\001QQQ" "\0200\001\002QQQ" |
-		q_to_nul >clear.noisyadvance &&
-	test_must_fail test-svn-fe -d preimage clear.noisybacktrack 15 &&
-	test-svn-fe -d preimage clear.noisyadvance 15 &&
-	test_must_be_empty actual
-'
-
-test_expect_success 'preimage view: reject truncated preimage' '
-	printf "SVNQ%b" "\010QQQQ" | q_to_nul >clear.lateemptyread &&
-	printf "SVNQ%b" "\010\001QQQ" | q_to_nul >clear.latenonemptyread &&
-	printf "SVNQ%b" "\001\010QQQ" | q_to_nul >clear.longread &&
-	test_must_fail test-svn-fe -d preimage clear.lateemptyread 9 &&
-	test_must_fail test-svn-fe -d preimage clear.latenonemptyread 9 &&
-	test_must_fail test-svn-fe -d preimage clear.longread 9
-'
-
-test_expect_success 'forbid unconsumed inline data' '
-	printf "SVNQ%b%s%b%s" "QQQQ\003" "bar" "QQQQ\001" "x" |
-		q_to_nul >inline.clear &&
-	test_must_fail test-svn-fe -d preimage inline.clear 18 >actual
-'
-
-test_expect_success 'reject truncated inline data' '
-	printf "SVNQ%b%s" "QQQQ\003" "b" | q_to_nul >inline.trunc &&
-	test_must_fail test-svn-fe -d preimage inline.trunc 10
-'
-
-test_expect_success 'reject truncated inline data (after instruction section)' '
-	printf "SVNQ%b%b%s" "QQ\001\001\003" "\0201" "b" | q_to_nul >insn.trunc &&
-	test_must_fail test-svn-fe -d preimage insn.trunc 11
-'
-
-test_expect_success 'copyfrom_data' '
-	echo hi >expect &&
-	printf "SVNQ%b%b%b" "QQ\003\001\003" "\0203" "hi\n" | q_to_nul >copydat &&
-	test-svn-fe -d preimage copydat 13 >actual &&
-	test_cmp expect actual
-'
-
-test_expect_success 'multiple copyfrom_data' '
-	echo hi >expect &&
-	printf "SVNQ%b%b%b%b%b" "QQ\003\002\003" "\0201\0202" "hi\n" \
-		"QQQ\002Q" "\0200Q" | q_to_nul >copy.multi &&
-	len=$(wc -c <copy.multi) &&
-	test-svn-fe -d preimage copy.multi $len >actual &&
-	test_cmp expect actual
-'
-
-test_expect_success 'incomplete multiple insn' '
-	printf "SVNQ%b%b%b" "QQ\003\002\003" "\0203\0200" "hi\n" |
-		q_to_nul >copy.partial &&
-	len=$(wc -c <copy.partial) &&
-	test_must_fail test-svn-fe -d preimage copy.partial $len
-'
-
-test_expect_success 'catch attempt to copy missing data' '
-	printf "SVNQ%b%b%s%b%s" "QQ\002\002\001" "\0201\0201" "X" \
-			"QQQQ\002" "YZ" |
-		q_to_nul >copy.incomplete &&
-	len=$(wc -c <copy.incomplete) &&
-	test_must_fail test-svn-fe -d preimage copy.incomplete $len
-'
-
-test_expect_success 'copyfrom target to repeat data' '
-	printf foofoo >expect &&
-	printf "SVNQ%b%b%s" "QQ\006\004\003" "\0203\0100\003Q" "foo" |
-		q_to_nul >copytarget.repeat &&
-	len=$(wc -c <copytarget.repeat) &&
-	test-svn-fe -d preimage copytarget.repeat $len >actual &&
-	test_cmp expect actual
-'
-
-test_expect_success 'copyfrom target out of order' '
-	printf foooof >expect &&
-	printf "SVNQ%b%b%s" \
-		"QQ\006\007\003" "\0203\0101\002\0101\001\0101Q" "foo" |
-		q_to_nul >copytarget.reverse &&
-	len=$(wc -c <copytarget.reverse) &&
-	test-svn-fe -d preimage copytarget.reverse $len >actual &&
-	test_cmp expect actual
-'
-
-test_expect_success 'catch copyfrom future' '
-	printf "SVNQ%b%b%s" "QQ\004\004\003" "\0202\0101\002\0201" "XYZ" |
-		q_to_nul >copytarget.infuture &&
-	len=$(wc -c <copytarget.infuture) &&
-	test_must_fail test-svn-fe -d preimage copytarget.infuture $len
-'
-
-test_expect_success 'copy to sustain' '
-	printf XYXYXYXYXYXZ >expect &&
-	printf "SVNQ%b%b%s" "QQ\014\004\003" "\0202\0111Q\0201" "XYZ" |
-		q_to_nul >copytarget.sustain &&
-	len=$(wc -c <copytarget.sustain) &&
-	test-svn-fe -d preimage copytarget.sustain $len >actual &&
-	test_cmp expect actual
-'
-
-test_expect_success 'catch copy that overflows' '
-	printf "SVNQ%b%b%s" "QQ\003\003\001" "\0201\0177Q" X |
-		q_to_nul >copytarget.overflow &&
-	len=$(wc -c <copytarget.overflow) &&
-	test_must_fail test-svn-fe -d preimage copytarget.overflow $len
-'
-
-test_expect_success 'copyfrom source' '
-	printf foo >expect &&
-	printf "SVNQ%b%b" "Q\003\003\002Q" "\003Q" | q_to_nul >copysource.all &&
-	test-svn-fe -d preimage copysource.all 11 >actual &&
-	test_cmp expect actual
-'
-
-test_expect_success 'copy backwards' '
-	printf oof >expect &&
-	printf "SVNQ%b%b" "Q\003\003\006Q" "\001\002\001\001\001Q" |
-		q_to_nul >copysource.rev &&
-	test-svn-fe -d preimage copysource.rev 15 >actual &&
-	test_cmp expect actual
-'
-
-test_expect_success 'offsets are relative to window' '
-	printf fo >expect &&
-	printf "SVNQ%b%b%b%b" "Q\003\001\002Q" "\001Q" \
-		"\002\001\001\002Q" "\001Q" |
-		q_to_nul >copysource.two &&
-	test-svn-fe -d preimage copysource.two 18 >actual &&
-	test_cmp expect actual
-'
-
-test_expect_success 'example from notes/svndiff' '
-	printf aaaaccccdddddddd >expect &&
-	printf aaaabbbbcccc >source &&
-	printf "SVNQ%b%b%s" "Q\014\020\007\001" \
-		"\004Q\004\010\0201\0107\010" d |
-		q_to_nul >delta.example &&
-	len=$(wc -c <delta.example) &&
-	test-svn-fe -d source delta.example $len >actual &&
-	test_cmp expect actual
-'
-
-test_done
diff --git a/t/t9020-remote-svn.sh b/t/t9020-remote-svn.sh
deleted file mode 100755
index 754c4a3..0000000
--- a/t/t9020-remote-svn.sh
+++ /dev/null
@@ -1,95 +0,0 @@
-#!/bin/sh
-
-test_description='tests remote-svn'
-
-. ./test-lib.sh
-
-MARKSPATH=.git/info/fast-import/remote-svn
-
-if ! test_have_prereq PYTHON
-then
-	skip_all='skipping remote-svn tests, python not available'
-	test_done
-fi
-
-# Override svnrdump with our simulator
-PATH="$HOME:$PATH"
-export PATH PYTHON_PATH GIT_BUILD_DIR
-
-write_script "$HOME/svnrdump" <<\EOF
-exec "$PYTHON_PATH" "$GIT_BUILD_DIR/contrib/svn-fe/svnrdump_sim.py" "$@"
-EOF
-
-init_git () {
-	rm -fr .git &&
-	git init &&
-	#git remote add svnsim testsvn::sim:///$TEST_DIRECTORY/t9020/example.svnrdump
-	# let's reuse an existing dump file!?
-	git remote add svnsim "testsvn::sim://$TEST_DIRECTORY/t9154/svn.dump"
-	git remote add svnfile "testsvn::file://$TEST_DIRECTORY/t9154/svn.dump"
-}
-
-if test -e "$GIT_BUILD_DIR/git-remote-testsvn"
-then
-	test_set_prereq REMOTE_SVN
-fi
-
-test_debug '
-	git --version
-	type git
-	type svnrdump
-'
-
-test_expect_success REMOTE_SVN 'simple fetch' '
-	init_git &&
-	git fetch svnsim &&
-	test_cmp .git/refs/svn/svnsim/master .git/refs/remotes/svnsim/master  &&
-	cp .git/refs/remotes/svnsim/master master.good
-'
-
-test_debug '
-	git show-ref -s refs/svn/svnsim/master
-	git show-ref -s refs/remotes/svnsim/master
-'
-
-test_expect_success REMOTE_SVN 'repeated fetch, nothing shall change' '
-	git fetch svnsim &&
-	test_cmp master.good .git/refs/remotes/svnsim/master
-'
-
-test_expect_success REMOTE_SVN 'fetch from a file:// url gives the same result' '
-	git fetch svnfile
-'
-
-test_expect_failure REMOTE_SVN 'the sha1 differ because the git-svn-id line in the commit msg contains the url' '
-	test_cmp .git/refs/remotes/svnfile/master .git/refs/remotes/svnsim/master
-'
-
-test_expect_success REMOTE_SVN 'mark-file regeneration' '
-	# filter out any other marks, that can not be regenerated. Only up to 3 digit revisions are allowed here
-	grep ":[0-9]\{1,3\} " $MARKSPATH/svnsim.marks > $MARKSPATH/svnsim.marks.old &&
-	rm $MARKSPATH/svnsim.marks &&
-	git fetch svnsim &&
-	test_cmp $MARKSPATH/svnsim.marks.old $MARKSPATH/svnsim.marks
-'
-
-test_expect_success REMOTE_SVN 'incremental imports must lead to the same head' '
-	SVNRMAX=3 &&
-	export SVNRMAX &&
-	init_git &&
-	git fetch svnsim &&
-	test_cmp .git/refs/svn/svnsim/master .git/refs/remotes/svnsim/master  &&
-	unset SVNRMAX &&
-	git fetch svnsim &&
-	test_cmp master.good .git/refs/remotes/svnsim/master
-'
-
-test_expect_success REMOTE_SVN 'respects configured default initial branch' '
-	git -c init.defaultBranch=trunk remote add -f trunk \
-		"testsvn::file://$TEST_DIRECTORY/t9154/svn.dump" &&
-	git rev-parse --verify refs/remotes/trunk/trunk
-'
-
-test_debug 'git branch -a'
-
-test_done
diff --git a/t/t9100-git-svn-basic.sh b/t/t9100-git-svn-basic.sh
index e4bb220..af28b01 100755
--- a/t/t9100-git-svn-basic.sh
+++ b/t/t9100-git-svn-basic.sh
@@ -4,18 +4,13 @@
 #
 
 test_description='git svn basic tests'
-GIT_SVN_LC_ALL=${LC_ALL:-$LANG}
+
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 . ./lib-git-svn.sh
 
-case "$GIT_SVN_LC_ALL" in
-*.UTF-8)
-	test_set_prereq UTF8
-	;;
-*)
-	say "# UTF-8 locale not set, some tests skipped ($GIT_SVN_LC_ALL)"
-	;;
-esac
+prepare_utf8_locale
 
 test_expect_success 'git svn --version works anywhere' '
 	nongit git svn --version
@@ -26,7 +21,7 @@ test_expect_success 'git svn help works anywhere' '
 '
 
 test_expect_success \
-    'initialize git svn' '
+	'initialize git svn' '
 	mkdir import &&
 	(
 		cd import &&
@@ -43,9 +38,9 @@ test_expect_success \
 	rm -rf import &&
 	git svn init "$svnrepo"'
 
-test_expect_success \
-    'import an SVN revision into git' \
-    'git svn fetch'
+test_expect_success 'import an SVN revision into git' '
+	git svn fetch
+'
 
 test_expect_success "checkout from svn" 'svn co "$svnrepo" "$SVN_TREE"'
 
@@ -184,8 +179,8 @@ test_expect_success POSIXPERM,SYMLINKS "$name" '
 	test ! -h "$SVN_TREE"/exec-2.sh &&
 	test_cmp help "$SVN_TREE"/exec-2.sh'
 
-name="commit with UTF-8 message: locale: $GIT_SVN_LC_ALL"
-LC_ALL="$GIT_SVN_LC_ALL"
+name="commit with UTF-8 message: locale: $GIT_TEST_UTF8_LOCALE"
+LC_ALL="$GIT_TEST_UTF8_LOCALE"
 export LC_ALL
 # This test relies on the previous test, hence requires POSIXPERM,SYMLINKS
 test_expect_success UTF8,POSIXPERM,SYMLINKS "$name" "
@@ -238,27 +233,26 @@ test_expect_success POSIXPERM,SYMLINKS "$name" '
 '
 
 test_expect_success 'exit if remote refs are ambigious' '
-        git config --add svn-remote.svn.fetch \
+	git config --add svn-remote.svn.fetch \
 		bar:refs/remotes/git-svn &&
 	test_must_fail git svn migrate
 '
 
 test_expect_success 'exit if init-ing a would clobber a URL' '
-        svnadmin create "${PWD}/svnrepo2" &&
-        svn mkdir -m "mkdir bar" "${svnrepo}2/bar" &&
-        git config --unset svn-remote.svn.fetch \
+	svnadmin create "${PWD}/svnrepo2" &&
+	svn mkdir -m "mkdir bar" "${svnrepo}2/bar" &&
+	git config --unset svn-remote.svn.fetch \
 		"^bar:refs/remotes/git-svn$" &&
 	test_must_fail git svn init "${svnrepo}2/bar"
         '
 
-test_expect_success \
-  'init allows us to connect to another directory in the same repo' '
-        git svn init --minimize-url -i bar "$svnrepo/bar" &&
-        git config --get svn-remote.svn.fetch \
-                              "^bar:refs/remotes/bar$" &&
-        git config --get svn-remote.svn.fetch \
-			      "^:refs/remotes/git-svn$"
-        '
+test_expect_success 'init allows us to connect to another directory in the same repo' '
+	git svn init --minimize-url -i bar "$svnrepo/bar" &&
+	git config --get svn-remote.svn.fetch \
+		"^bar:refs/remotes/bar$" &&
+	git config --get svn-remote.svn.fetch \
+		"^:refs/remotes/git-svn$"
+'
 
 test_expect_success 'dcommit $rev does not clobber current branch' '
 	git svn fetch -i bar &&
@@ -275,7 +269,7 @@ test_expect_success 'dcommit $rev does not clobber current branch' '
 	test refs/heads/my-bar = $(git symbolic-ref HEAD) &&
 	git log refs/remotes/bar | grep "change 1" &&
 	! git log refs/remotes/bar | grep "change 2" &&
-	git checkout master &&
+	git checkout main &&
 	git branch -D my-bar
 	'
 
@@ -327,7 +321,7 @@ test_expect_success 'git-svn works in a bare repository' '
 	git svn fetch ) &&
 	rm -rf bare-repo
 	'
-test_expect_success 'git-svn works in in a repository with a gitdir: link' '
+test_expect_success 'git-svn works in a repository with a gitdir: link' '
 	mkdir worktree gitdir &&
 	( cd worktree &&
 	git svn init "$svnrepo" &&
diff --git a/t/t9101-git-svn-props.sh b/t/t9101-git-svn-props.sh
index 8b5681d..52046e6 100755
--- a/t/t9101-git-svn-props.sh
+++ b/t/t9101-git-svn-props.sh
@@ -4,6 +4,7 @@
 #
 
 test_description='git svn property tests'
+
 . ./lib-git-svn.sh
 
 mkdir import
diff --git a/t/t9102-git-svn-deep-rmdir.sh b/t/t9102-git-svn-deep-rmdir.sh
index 66cd511..946ef85 100755
--- a/t/t9102-git-svn-deep-rmdir.sh
+++ b/t/t9102-git-svn-deep-rmdir.sh
@@ -1,5 +1,6 @@
 #!/bin/sh
 test_description='git svn rmdir'
+
 . ./lib-git-svn.sh
 
 test_expect_success 'initialize repo' '
diff --git a/t/t9104-git-svn-follow-parent.sh b/t/t9104-git-svn-follow-parent.sh
index 67eed2f..b5845e2 100755
--- a/t/t9104-git-svn-follow-parent.sh
+++ b/t/t9104-git-svn-follow-parent.sh
@@ -4,6 +4,7 @@
 #
 
 test_description='git svn fetching'
+
 . ./lib-git-svn.sh
 
 test_expect_success 'initialize repo' '
@@ -40,51 +41,51 @@ test_expect_success 'init and fetch a moved directory' '
 	'
 
 test_expect_success 'init and fetch from one svn-remote' '
-        git config svn-remote.svn.url "$svnrepo" &&
-        git config --add svn-remote.svn.fetch \
-          trunk:refs/remotes/svn/trunk &&
-        git config --add svn-remote.svn.fetch \
-          thunk:refs/remotes/svn/thunk &&
-        git svn fetch -i svn/thunk &&
+	git config svn-remote.svn.url "$svnrepo" &&
+	git config --add svn-remote.svn.fetch \
+		trunk:refs/remotes/svn/trunk &&
+	git config --add svn-remote.svn.fetch \
+		thunk:refs/remotes/svn/thunk &&
+	git svn fetch -i svn/thunk &&
 	test "$(git rev-parse --verify refs/remotes/svn/trunk)" \
-	   = "$(git rev-parse --verify refs/remotes/svn/thunk~1)" &&
+		= "$(git rev-parse --verify refs/remotes/svn/thunk~1)" &&
 	git cat-file blob refs/remotes/svn/thunk:readme >actual &&
 	test "$(sed -n -e "3p" actual)" = goodbye
-        '
+'
 
 test_expect_success 'follow deleted parent' '
-        (svn_cmd cp -m "resurrecting trunk as junk" \
-               "$svnrepo"/trunk@2 "$svnrepo"/junk ||
-         svn cp -m "resurrecting trunk as junk" \
-               -r2 "$svnrepo"/trunk "$svnrepo"/junk) &&
-        git config --add svn-remote.svn.fetch \
-          junk:refs/remotes/svn/junk &&
-        git svn fetch -i svn/thunk &&
-        git svn fetch -i svn/junk &&
+	(svn_cmd cp -m "resurrecting trunk as junk" \
+		"$svnrepo"/trunk@2 "$svnrepo"/junk ||
+	 svn cp -m "resurrecting trunk as junk" \
+		-r2 "$svnrepo"/trunk "$svnrepo"/junk) &&
+	git config --add svn-remote.svn.fetch \
+		junk:refs/remotes/svn/junk &&
+	git svn fetch -i svn/thunk &&
+	git svn fetch -i svn/junk &&
 	test -z "$(git diff svn/junk svn/trunk)" &&
 	test "$(git merge-base svn/junk svn/trunk)" \
-	   = "$(git rev-parse svn/trunk)"
-        '
+		= "$(git rev-parse svn/trunk)"
+'
 
 test_expect_success 'follow larger parent' '
-        mkdir -p import/trunk/thunk/bump/thud &&
-        echo hi > import/trunk/thunk/bump/thud/file &&
-        svn import -m "import a larger parent" import "$svnrepo"/larger-parent &&
-        svn cp -m "hi" "$svnrepo"/larger-parent "$svnrepo"/another-larger &&
-        git svn init --minimize-url -i larger \
-	  "$svnrepo"/larger-parent/trunk/thunk/bump/thud &&
-        git svn fetch -i larger &&
+	mkdir -p import/trunk/thunk/bump/thud &&
+	echo hi > import/trunk/thunk/bump/thud/file &&
+	svn import -m "import a larger parent" import "$svnrepo"/larger-parent &&
+	svn cp -m "hi" "$svnrepo"/larger-parent "$svnrepo"/another-larger &&
+	git svn init --minimize-url -i larger \
+		"$svnrepo"/larger-parent/trunk/thunk/bump/thud &&
+	git svn fetch -i larger &&
 	git svn init --minimize-url -i larger-parent \
-	  "$svnrepo"/another-larger/trunk/thunk/bump/thud &&
+		"$svnrepo"/another-larger/trunk/thunk/bump/thud &&
 	git svn fetch -i larger-parent &&
-        git rev-parse --verify refs/remotes/larger &&
-        git rev-parse --verify \
-	   refs/remotes/larger-parent &&
+	git rev-parse --verify refs/remotes/larger &&
+	git rev-parse --verify \
+		refs/remotes/larger-parent &&
 	test "$(git merge-base \
 		 refs/remotes/larger-parent \
 		 refs/remotes/larger)" = \
-	     "$(git rev-parse refs/remotes/larger)"
-        '
+		"$(git rev-parse refs/remotes/larger)"
+'
 
 test_expect_success 'follow higher-level parent' '
 	svn mkdir -m "follow higher-level parent" "$svnrepo"/blob &&
@@ -117,7 +118,7 @@ test_expect_success 'follow-parent avoids deleting relevant info' '
 	mkdir -p import/trunk/subversion/bindings/swig/perl/t &&
 	for i in a b c ; do \
 	  echo $i > import/trunk/subversion/bindings/swig/perl/$i.pm &&
-	  echo _$i > import/trunk/subversion/bindings/swig/perl/t/$i.t; \
+	  echo _$i > import/trunk/subversion/bindings/swig/perl/t/$i.t || return 1
 	done &&
 	  echo "bad delete test" > \
 	   import/trunk/subversion/bindings/swig/perl/t/larger-parent &&
@@ -134,7 +135,7 @@ test_expect_success 'follow-parent avoids deleting relevant info' '
 		svn mv t native/t &&
 		for i in a b c
 		do
-			svn mv $i.pm native/$i.pm
+			svn mv $i.pm native/$i.pm || return 1
 		done &&
 		echo z >>native/t/c.t &&
 		poke native/t/c.t &&
diff --git a/t/t9106-git-svn-commit-diff-clobber.sh b/t/t9106-git-svn-commit-diff-clobber.sh
index aec45bc..bca496c 100755
--- a/t/t9106-git-svn-commit-diff-clobber.sh
+++ b/t/t9106-git-svn-commit-diff-clobber.sh
@@ -2,6 +2,7 @@
 #
 # Copyright (c) 2006 Eric Wong
 test_description='git svn commit-diff clobber'
+
 . ./lib-git-svn.sh
 
 test_expect_success 'initialize repo' '
diff --git a/t/t9107-git-svn-migrate.sh b/t/t9107-git-svn-migrate.sh
index ceaa5ba..aa908bb 100755
--- a/t/t9107-git-svn-migrate.sh
+++ b/t/t9107-git-svn-migrate.sh
@@ -98,10 +98,10 @@ test_expect_success 'migrate --minimize on old inited layout' '
 	rm -rf "$GIT_DIR"/svn &&
 	for i in $(cat fetch.out)
 	do
-		path=$(expr $i : "\([^:]*\):.*$")
-		ref=$(expr $i : "[^:]*:\(refs/remotes/.*\)$")
-		if test -z "$ref"; then continue; fi
-		if test -n "$path"; then path="/$path"; fi
+		path=${i%%:*} &&
+		ref=${i#*:} &&
+		if test "$ref" = "${ref#refs/remotes/}"; then continue; fi &&
+		if test -n "$path"; then path="/$path"; fi &&
 		mkdir -p "$GIT_DIR"/svn/$ref/info/ &&
 		echo "$svnrepo"$path >"$GIT_DIR"/svn/$ref/info/url ||
 		return 1
diff --git a/t/t9114-git-svn-dcommit-merge.sh b/t/t9114-git-svn-dcommit-merge.sh
index 32317d6..e06538b 100755
--- a/t/t9114-git-svn-dcommit-merge.sh
+++ b/t/t9114-git-svn-dcommit-merge.sh
@@ -27,7 +27,7 @@ cat << EOF
 # GNU General Public License for more details.
 #
 # You should have received a copy of the GNU General Public License
-# along with this program; if not, see <http://www.gnu.org/licenses/>.
+# along with this program; if not, see <https://www.gnu.org/licenses/>.
 #
 EOF
 }
diff --git a/t/t9115-git-svn-dcommit-funky-renames.sh b/t/t9115-git-svn-dcommit-funky-renames.sh
index 9b44a44..743fbe1 100755
--- a/t/t9115-git-svn-dcommit-funky-renames.sh
+++ b/t/t9115-git-svn-dcommit-funky-renames.sh
@@ -93,9 +93,9 @@ test_expect_success 'git svn rebase works inside a fresh-cloned repository' '
 # > ... All of the above characters, except for the backslash, are converted
 # > to special UNICODE characters in the range 0xf000 to 0xf0ff (the
 # > "Private use area") when creating or accessing files.
-prepare_a_utf8_locale
+prepare_utf8_locale
 test_expect_success UTF8,!MINGW,!UTF8_NFD_TO_NFC 'svn.pathnameencoding=cp932 new file on dcommit' '
-	LC_ALL=$a_utf8_locale &&
+	LC_ALL=$GIT_TEST_UTF8_LOCALE &&
 	export LC_ALL &&
 	neq=$(printf "\201\202") &&
 	git config svn.pathnameencoding cp932 &&
@@ -107,7 +107,7 @@ test_expect_success UTF8,!MINGW,!UTF8_NFD_TO_NFC 'svn.pathnameencoding=cp932 new
 
 # See the comment on the above test for setting of LC_ALL.
 test_expect_success !MINGW,!UTF8_NFD_TO_NFC 'svn.pathnameencoding=cp932 rename on dcommit' '
-	LC_ALL=$a_utf8_locale &&
+	LC_ALL=$GIT_TEST_UTF8_LOCALE &&
 	export LC_ALL &&
 	inf=$(printf "\201\207") &&
 	git config svn.pathnameencoding cp932 &&
diff --git a/t/t9116-git-svn-log.sh b/t/t9116-git-svn-log.sh
index 0a9f1ef..d74d7b2 100755
--- a/t/t9116-git-svn-log.sh
+++ b/t/t9116-git-svn-log.sh
@@ -4,6 +4,7 @@
 #
 
 test_description='git svn log tests'
+
 . ./lib-git-svn.sh
 
 test_expect_success 'setup repository and import' '
diff --git a/t/t9117-git-svn-init-clone.sh b/t/t9117-git-svn-init-clone.sh
index 044f65e..3b038c3 100755
--- a/t/t9117-git-svn-init-clone.sh
+++ b/t/t9117-git-svn-init-clone.sh
@@ -7,12 +7,6 @@ test_description='git svn init/clone tests'
 
 . ./lib-git-svn.sh
 
-# setup, run inside tmp so we don't have any conflicts with $svnrepo
-set -e
-rm -r .git
-mkdir tmp
-cd tmp
-
 test_expect_success 'setup svnrepo' '
 	mkdir project project/trunk project/branches project/tags &&
 	echo foo > project/trunk/foo &&
@@ -23,32 +17,32 @@ test_expect_success 'setup svnrepo' '
 test_expect_success 'basic clone' '
 	test ! -d trunk &&
 	git svn clone "$svnrepo"/project/trunk &&
-	test -d trunk/.git/svn &&
-	test -e trunk/foo &&
+	test_path_is_dir trunk/.git/svn &&
+	test_path_exists trunk/foo &&
 	rm -rf trunk
 	'
 
 test_expect_success 'clone to target directory' '
 	test ! -d target &&
 	git svn clone "$svnrepo"/project/trunk target &&
-	test -d target/.git/svn &&
-	test -e target/foo &&
+	test_path_is_dir target/.git/svn &&
+	test_path_exists target/foo &&
 	rm -rf target
 	'
 
 test_expect_success 'clone with --stdlayout' '
 	test ! -d project &&
 	git svn clone -s "$svnrepo"/project &&
-	test -d project/.git/svn &&
-	test -e project/foo &&
+	test_path_is_dir project/.git/svn &&
+	test_path_exists project/foo &&
 	rm -rf project
 	'
 
 test_expect_success 'clone to target directory with --stdlayout' '
 	test ! -d target &&
 	git svn clone -s "$svnrepo"/project target &&
-	test -d target/.git/svn &&
-	test -e target/foo &&
+	test_path_is_dir target/.git/svn &&
+	test_path_exists target/foo &&
 	rm -rf target
 	'
 
diff --git a/t/t9118-git-svn-funky-branch-names.sh b/t/t9118-git-svn-funky-branch-names.sh
index a159ff9..d3261e3 100755
--- a/t/t9118-git-svn-funky-branch-names.sh
+++ b/t/t9118-git-svn-funky-branch-names.sh
@@ -38,7 +38,7 @@ test_expect_success 'setup svnrepo' '
 # SVN 1.7 will truncate "not-a%40{0]" to just "not-a".
 # Look at what SVN wound up naming the branch and use that.
 # Be sure to escape the @ if it shows up.
-non_reflog=$(svn_cmd ls "$svnrepo/pr ject/branches" | grep not-a | sed 's/\///' | sed 's/@/%40/')
+non_reflog=$(svn_cmd ls "$svnrepo/pr ject/branches" | sed -ne '/not-a/ { s/\///; s/@/%40/; p }')
 
 test_expect_success 'test clone with funky branch names' '
 	git svn clone -s "$svnrepo/pr ject" project &&
diff --git a/t/t9119-git-svn-info.sh b/t/t9119-git-svn-info.sh
index 8201c3e..088d1c5 100755
--- a/t/t9119-git-svn-info.sh
+++ b/t/t9119-git-svn-info.sh
@@ -28,7 +28,7 @@ test_cmp_info () {
 	rm -f tmp.expect tmp.actual
 }
 
-quoted_svnrepo="$(echo $svnrepo | sed 's/ /%20/')"
+quoted_svnrepo="$(echo $svnrepo | test_uri_escape)"
 
 test_expect_success 'setup repository and import' '
 	mkdir info &&
diff --git a/t/t9122-git-svn-author.sh b/t/t9122-git-svn-author.sh
index 9e8fe38..0fc289a 100755
--- a/t/t9122-git-svn-author.sh
+++ b/t/t9122-git-svn-author.sh
@@ -1,6 +1,7 @@
 #!/bin/sh
 
 test_description='git svn authorship'
+
 . ./lib-git-svn.sh
 
 test_expect_success 'setup svn repository' '
diff --git a/t/t9127-git-svn-partial-rebuild.sh b/t/t9127-git-svn-partial-rebuild.sh
index 2e4789d..97f495b 100755
--- a/t/t9127-git-svn-partial-rebuild.sh
+++ b/t/t9127-git-svn-partial-rebuild.sh
@@ -4,6 +4,7 @@
 #
 
 test_description='git svn partial-rebuild tests'
+
 . ./lib-git-svn.sh
 
 test_expect_success 'initialize svnrepo' '
diff --git a/t/t9128-git-svn-cmd-branch.sh b/t/t9128-git-svn-cmd-branch.sh
index 4e95f79..783e3ba 100755
--- a/t/t9128-git-svn-cmd-branch.sh
+++ b/t/t9128-git-svn-cmd-branch.sh
@@ -4,6 +4,7 @@
 #
 
 test_description='git svn partial-rebuild tests'
+
 . ./lib-git-svn.sh
 
 test_expect_success 'initialize svnrepo' '
diff --git a/t/t9129-git-svn-i18n-commitencoding.sh b/t/t9129-git-svn-i18n-commitencoding.sh
index 2c213ae..185248a 100755
--- a/t/t9129-git-svn-i18n-commitencoding.sh
+++ b/t/t9129-git-svn-i18n-commitencoding.sh
@@ -4,6 +4,7 @@
 
 test_description='git svn honors i18n.commitEncoding in config'
 
+TEST_FAILS_SANITIZE_LEAK=true
 . ./lib-git-svn.sh
 
 compare_git_head_with () {
@@ -14,12 +15,12 @@ compare_git_head_with () {
 	test_cmp current "$1"
 }
 
-prepare_a_utf8_locale
+prepare_utf8_locale
 
 compare_svn_head_with () {
 	# extract just the log message and strip out committer info.
 	# don't use --limit here since svn 1.1.x doesn't have it,
-	LC_ALL="$a_utf8_locale" svn log $(git svn info --url) | perl -w -e '
+	LC_ALL="$GIT_TEST_UTF8_LOCALE" svn log $(git svn info --url) | perl -w -e '
 		use bytes;
 		$/ = ("-"x72) . "\n";
 		my @x = <STDIN>;
diff --git a/t/t9130-git-svn-authors-file.sh b/t/t9130-git-svn-authors-file.sh
index cb764bc..90325db 100755
--- a/t/t9130-git-svn-authors-file.sh
+++ b/t/t9130-git-svn-authors-file.sh
@@ -15,7 +15,7 @@ EOF
 test_expect_success 'setup svnrepo' '
 	for i in aa bb cc dd
 	do
-		svn_cmd mkdir -m $i --username $i "$svnrepo"/$i
+		svn_cmd mkdir -m $i --username $i "$svnrepo"/$i || return 1
 	done
 	'
 
@@ -59,8 +59,8 @@ test_expect_success 'authors-file against globs' '
 	git svn clone --authors-file=svn-authors -s "$svnrepo"/aa aa-work &&
 	for i in bb ee cc
 	do
-		branch="aa/branches/$i"
-		svn_cmd mkdir -m "$branch" --username $i "$svnrepo/$branch"
+		branch="aa/branches/$i" &&
+		svn_cmd mkdir -m "$branch" --username $i "$svnrepo/$branch" || return 1
 	done
 	'
 
diff --git a/t/t9133-git-svn-nested-git-repo.sh b/t/t9133-git-svn-nested-git-repo.sh
index f894860..8ca2467 100755
--- a/t/t9133-git-svn-nested-git-repo.sh
+++ b/t/t9133-git-svn-nested-git-repo.sh
@@ -11,7 +11,7 @@ test_expect_success 'setup repo with a git repo inside it' '
 	(
 		cd s &&
 		git init &&
-		test -f .git/HEAD &&
+		git symbolic-ref HEAD &&
 		> .git/a &&
 		echo a > a &&
 		svn_cmd add .git a &&
@@ -35,7 +35,7 @@ test_expect_success 'SVN-side change outside of .git' '
 		echo b >> a &&
 		svn_cmd commit -m "SVN-side change outside of .git" &&
 		svn_cmd up &&
-		svn_cmd log -v | fgrep "SVN-side change outside of .git"
+		svn_cmd log -v | grep -F "SVN-side change outside of .git"
 	)
 '
 
@@ -59,7 +59,7 @@ test_expect_success 'SVN-side change inside of .git' '
 		svn_cmd add --force .git &&
 		svn_cmd commit -m "SVN-side change inside of .git" &&
 		svn_cmd up &&
-		svn_cmd log -v | fgrep "SVN-side change inside of .git"
+		svn_cmd log -v | grep -F "SVN-side change inside of .git"
 	)
 '
 
@@ -82,7 +82,7 @@ test_expect_success 'SVN-side change in and out of .git' '
 		git commit -m "add a inside an SVN repo" &&
 		svn_cmd commit -m "SVN-side change in and out of .git" &&
 		svn_cmd up &&
-		svn_cmd log -v | fgrep "SVN-side change in and out of .git"
+		svn_cmd log -v | grep -F "SVN-side change in and out of .git"
 	)
 '
 
diff --git a/t/t9134-git-svn-ignore-paths.sh b/t/t9134-git-svn-ignore-paths.sh
index fff49c4..3188400 100755
--- a/t/t9134-git-svn-ignore-paths.sh
+++ b/t/t9134-git-svn-ignore-paths.sh
@@ -27,7 +27,7 @@ test_expect_success 'setup test repository' '
 test_expect_success 'clone an SVN repository with ignored www directory' '
 	git svn clone --ignore-paths="^www" "$svnrepo" g &&
 	echo test_qqq > expect &&
-	for i in g/*/*.txt; do cat $i >> expect2; done &&
+	for i in g/*/*.txt; do cat $i >> expect2 || return 1; done &&
 	test_cmp expect expect2
 '
 
@@ -36,14 +36,14 @@ test_expect_success 'init+fetch an SVN repository with ignored www directory' '
 	( cd c && git svn fetch --ignore-paths="^www" ) &&
 	rm expect2 &&
 	echo test_qqq > expect &&
-	for i in c/*/*.txt; do cat $i >> expect2; done &&
+	for i in c/*/*.txt; do cat $i >> expect2 || return 1; done &&
 	test_cmp expect expect2
 '
 
 test_expect_success 'verify ignore-paths config saved by clone' '
 	(
 	    cd g &&
-	    git config --get svn-remote.svn.ignore-paths | fgrep "www"
+	    git config --get svn-remote.svn.ignore-paths | grep www
 	)
 '
 
@@ -53,7 +53,7 @@ test_expect_success 'SVN-side change outside of www' '
 		echo b >> qqq/test_qqq.txt &&
 		svn_cmd commit -m "SVN-side change outside of www" &&
 		svn_cmd up &&
-		svn_cmd log -v | fgrep "SVN-side change outside of www"
+		svn_cmd log -v | grep "SVN-side change outside of www"
 	)
 '
 
@@ -62,7 +62,7 @@ test_expect_success 'update git svn-cloned repo (config ignore)' '
 		cd g &&
 		git svn rebase &&
 		printf "test_qqq\nb\n" > expect &&
-		for i in */*.txt; do cat $i >> expect2; done &&
+		for i in */*.txt; do cat $i >> expect2 || exit 1; done &&
 		test_cmp expect2 expect &&
 		rm expect expect2
 	)
@@ -73,7 +73,7 @@ test_expect_success 'update git svn-cloned repo (option ignore)' '
 		cd c &&
 		git svn rebase --ignore-paths="^www" &&
 		printf "test_qqq\nb\n" > expect &&
-		for i in */*.txt; do cat $i >> expect2; done &&
+		for i in */*.txt; do cat $i >> expect2 || exit 1; done &&
 		test_cmp expect2 expect &&
 		rm expect expect2
 	)
@@ -85,7 +85,7 @@ test_expect_success 'SVN-side change inside of ignored www' '
 		echo zaq >> www/test_www.txt &&
 		svn_cmd commit -m "SVN-side change inside of www/test_www.txt" &&
 		svn_cmd up &&
-		svn_cmd log -v | fgrep "SVN-side change inside of www/test_www.txt"
+		svn_cmd log -v | grep -F "SVN-side change inside of www/test_www.txt"
 	)
 '
 
@@ -94,7 +94,7 @@ test_expect_success 'update git svn-cloned repo (config ignore)' '
 		cd g &&
 		git svn rebase &&
 		printf "test_qqq\nb\n" > expect &&
-		for i in */*.txt; do cat $i >> expect2; done &&
+		for i in */*.txt; do cat $i >> expect2 || exit 1; done &&
 		test_cmp expect2 expect &&
 		rm expect expect2
 	)
@@ -105,7 +105,7 @@ test_expect_success 'update git svn-cloned repo (option ignore)' '
 		cd c &&
 		git svn rebase --ignore-paths="^www" &&
 		printf "test_qqq\nb\n" > expect &&
-		for i in */*.txt; do cat $i >> expect2; done &&
+		for i in */*.txt; do cat $i >> expect2 || exit 1; done &&
 		test_cmp expect2 expect &&
 		rm expect expect2
 	)
@@ -118,7 +118,7 @@ test_expect_success 'SVN-side change in and out of ignored www' '
 		echo ygg >> qqq/test_qqq.txt &&
 		svn_cmd commit -m "SVN-side change in and out of ignored www" &&
 		svn_cmd up &&
-		svn_cmd log -v | fgrep "SVN-side change in and out of ignored www"
+		svn_cmd log -v | grep "SVN-side change in and out of ignored www"
 	)
 '
 
@@ -127,7 +127,7 @@ test_expect_success 'update git svn-cloned repo again (config ignore)' '
 		cd g &&
 		git svn rebase &&
 		printf "test_qqq\nb\nygg\n" > expect &&
-		for i in */*.txt; do cat $i >> expect2; done &&
+		for i in */*.txt; do cat $i >> expect2 || exit 1; done &&
 		test_cmp expect2 expect &&
 		rm expect expect2
 	)
@@ -138,7 +138,7 @@ test_expect_success 'update git svn-cloned repo again (option ignore)' '
 		cd c &&
 		git svn rebase --ignore-paths="^www" &&
 		printf "test_qqq\nb\nygg\n" > expect &&
-		for i in */*.txt; do cat $i >> expect2; done &&
+		for i in */*.txt; do cat $i >> expect2 || exit 1; done &&
 		test_cmp expect2 expect &&
 		rm expect expect2
 	)
diff --git a/t/t9138-git-svn-authors-prog.sh b/t/t9138-git-svn-authors-prog.sh
index 027b416..784ec7f 100755
--- a/t/t9138-git-svn-authors-prog.sh
+++ b/t/t9138-git-svn-authors-prog.sh
@@ -27,7 +27,7 @@ test_expect_success 'svn-authors setup' '
 test_expect_success 'setup svnrepo' '
 	for i in aa bb cc-sub dd-sub ee-foo ff
 	do
-		svn mkdir -m $i --username $i "$svnrepo"/$i
+		svn mkdir -m $i --username $i "$svnrepo"/$i || return 1
 	done
 '
 
diff --git a/t/t9139-git-svn-non-utf8-commitencoding.sh b/t/t9139-git-svn-non-utf8-commitencoding.sh
index 22d80b0..b7f756b 100755
--- a/t/t9139-git-svn-non-utf8-commitencoding.sh
+++ b/t/t9139-git-svn-non-utf8-commitencoding.sh
@@ -4,6 +4,7 @@
 
 test_description='git svn refuses to dcommit non-UTF8 messages'
 
+TEST_FAILS_SANITIZE_LEAK=true
 . ./lib-git-svn.sh
 
 # ISO-2022-JP can pass for valid UTF-8, so skipping that in this test
diff --git a/t/t9140-git-svn-reset.sh b/t/t9140-git-svn-reset.sh
index e855904..a420b2a 100755
--- a/t/t9140-git-svn-reset.sh
+++ b/t/t9140-git-svn-reset.sh
@@ -43,7 +43,7 @@ test_expect_success 'fetch fails on modified hidden file' '
 	  git svn find-rev refs/remotes/git-svn > ../expect &&
 	  test_must_fail git svn fetch 2> ../errors &&
 	  git svn find-rev refs/remotes/git-svn > ../expect2 ) &&
-	fgrep "not found in commit" errors &&
+	grep "not found in commit" errors &&
 	test_cmp expect expect2
 '
 
@@ -59,7 +59,7 @@ test_expect_success 'refetch succeeds not ignoring any files' '
 	( cd g &&
 	  git svn fetch &&
 	  git svn rebase &&
-	  fgrep "mod hidden" hid/hid.txt
+	  grep "mod hidden" hid/hid.txt
 	)
 '
 
diff --git a/t/t9145-git-svn-master-branch.sh b/t/t9145-git-svn-master-branch.sh
index 3bbf341..f863e43 100755
--- a/t/t9145-git-svn-master-branch.sh
+++ b/t/t9145-git-svn-master-branch.sh
@@ -2,7 +2,10 @@
 #
 # Copyright (c) 2009 Eric Wong
 #
-test_description='git svn initial master branch is "trunk" if possible'
+test_description='git svn initial main branch is "trunk" if possible'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./lib-git-svn.sh
 
 test_expect_success 'setup test repository' '
@@ -13,12 +16,12 @@ test_expect_success 'setup test repository' '
 	svn_cmd import -m b/b i "$svnrepo/branches/b"
 '
 
-test_expect_success 'git svn clone --stdlayout sets up trunk as master' '
+test_expect_success 'git svn clone --stdlayout sets up trunk as main' '
 	git svn clone -s "$svnrepo" g &&
 	(
 		cd g &&
 		test x$(git rev-parse --verify refs/remotes/origin/trunk^0) = \
-		     x$(git rev-parse --verify refs/heads/master^0)
+		     x$(git rev-parse --verify refs/heads/main^0)
 	)
 '
 
diff --git a/t/t9146-git-svn-empty-dirs.sh b/t/t9146-git-svn-empty-dirs.sh
index 5f91c0d..926ac81 100755
--- a/t/t9146-git-svn-empty-dirs.sh
+++ b/t/t9146-git-svn-empty-dirs.sh
@@ -3,12 +3,13 @@
 # Copyright (c) 2009 Eric Wong
 
 test_description='git svn creates empty directories'
+
 . ./lib-git-svn.sh
 
 test_expect_success 'initialize repo' '
 	for i in a b c d d/e d/e/f "weird file name"
 	do
-		svn_cmd mkdir -m "mkdir $i" "$svnrepo"/"$i"
+		svn_cmd mkdir -m "mkdir $i" "$svnrepo"/"$i" || return 1
 	done
 '
 
@@ -19,11 +20,7 @@ test_expect_success 'empty directories exist' '
 		cd cloned &&
 		for i in a b c d d/e d/e/f "weird file name"
 		do
-			if ! test -d "$i"
-			then
-				echo >&2 "$i does not exist" &&
-				exit 1
-			fi
+			test_path_is_dir "$i" || exit 1
 		done
 	)
 '
@@ -36,11 +33,7 @@ test_expect_success 'option automkdirs set to false' '
 		git svn fetch &&
 		for i in a b c d d/e d/e/f "weird file name"
 		do
-			if test -d "$i"
-			then
-				echo >&2 "$i exists" &&
-				exit 1
-			fi
+			test_path_is_missing "$i" || exit 1
 		done
 	)
 '
@@ -51,7 +44,7 @@ test_expect_success 'more emptiness' '
 
 test_expect_success 'git svn rebase creates empty directory' '
 	( cd cloned && git svn rebase ) &&
-	test -d cloned/"! !"
+	test_path_is_dir cloned/"! !"
 '
 
 test_expect_success 'git svn mkdirs recreates empty directories' '
@@ -61,11 +54,7 @@ test_expect_success 'git svn mkdirs recreates empty directories' '
 		git svn mkdirs &&
 		for i in a b c d d/e d/e/f "weird file name" "! !"
 		do
-			if ! test -d "$i"
-			then
-				echo >&2 "$i does not exist" &&
-				exit 1
-			fi
+			test_path_is_dir "$i" || exit 1
 		done
 	)
 '
@@ -77,32 +66,20 @@ test_expect_success 'git svn mkdirs -r works' '
 		git svn mkdirs -r7 &&
 		for i in a b c d d/e d/e/f "weird file name"
 		do
-			if ! test -d "$i"
-			then
-				echo >&2 "$i does not exist" &&
-				exit 1
-			fi
+			test_path_is_dir "$i" || exit 1
 		done &&
 
-		if test -d "! !"
-		then
-			echo >&2 "$i should not exist" &&
-			exit 1
-		fi &&
+		test_path_is_missing "! !" || exit 1 &&
 
 		git svn mkdirs -r8 &&
-		if ! test -d "! !"
-		then
-			echo >&2 "$i not exist" &&
-			exit 1
-		fi
+		test_path_is_dir "! !" || exit 1
 	)
 '
 
 test_expect_success 'initialize trunk' '
 	for i in trunk trunk/a trunk/"weird file name"
 	do
-		svn_cmd mkdir -m "mkdir $i" "$svnrepo"/"$i"
+		svn_cmd mkdir -m "mkdir $i" "$svnrepo"/"$i" || return 1
 	done
 '
 
@@ -113,11 +90,7 @@ test_expect_success 'empty directories in trunk exist' '
 		cd trunk &&
 		for i in a "weird file name"
 		do
-			if ! test -d "$i"
-			then
-				echo >&2 "$i does not exist" &&
-				exit 1
-			fi
+			test_path_is_dir "$i" || exit 1
 		done
 	)
 '
@@ -128,7 +101,7 @@ test_expect_success 'remove a top-level directory from svn' '
 
 test_expect_success 'removed top-level directory does not exist' '
 	git svn clone "$svnrepo" removed &&
-	test ! -e removed/d
+	test_path_is_missing removed/d
 
 '
 unhandled=.git/svn/refs/remotes/git-svn/unhandled.log
@@ -142,15 +115,11 @@ test_expect_success 'git svn gc-ed files work' '
 			svn_cmd mkdir -m gz "$svnrepo"/gz &&
 			git reset --hard $(git rev-list HEAD | tail -1) &&
 			git svn rebase &&
-			test -f "$unhandled".gz &&
-			test -f "$unhandled" &&
+			test_path_is_file "$unhandled".gz &&
+			test_path_is_file "$unhandled" &&
 			for i in a b c "weird file name" gz "! !"
 			do
-				if ! test -d "$i"
-				then
-					echo >&2 "$i does not exist" &&
-					exit 1
-				fi
+				test_path_is_dir "$i" || exit 1
 			done
 		fi
 	)
diff --git a/t/t9147-git-svn-include-paths.sh b/t/t9147-git-svn-include-paths.sh
index d292bf9..63fa0b6 100755
--- a/t/t9147-git-svn-include-paths.sh
+++ b/t/t9147-git-svn-include-paths.sh
@@ -28,7 +28,7 @@ test_expect_success 'setup test repository' '
 test_expect_success 'clone an SVN repository with filter to include qqq directory' '
 	git svn clone --include-paths="qqq" "$svnrepo" g &&
 	echo test_qqq > expect &&
-	for i in g/*/*.txt; do cat $i >> expect2; done &&
+	for i in g/*/*.txt; do cat $i >> expect2 || return 1; done &&
 	test_cmp expect expect2
 '
 
@@ -38,14 +38,14 @@ test_expect_success 'init+fetch an SVN repository with included qqq directory' '
 	( cd c && git svn fetch --include-paths="qqq" ) &&
 	rm expect2 &&
 	echo test_qqq > expect &&
-	for i in c/*/*.txt; do cat $i >> expect2; done &&
+	for i in c/*/*.txt; do cat $i >> expect2 || return 1; done &&
 	test_cmp expect expect2
 '
 
 test_expect_success 'verify include-paths config saved by clone' '
 	(
 	    cd g &&
-	    git config --get svn-remote.svn.include-paths | fgrep "qqq"
+	    git config --get svn-remote.svn.include-paths | grep qqq
 	)
 '
 
@@ -55,7 +55,7 @@ test_expect_success 'SVN-side change outside of www' '
 		echo b >> qqq/test_qqq.txt &&
 		svn_cmd commit -m "SVN-side change outside of www" &&
 		svn_cmd up &&
-		svn_cmd log -v | fgrep "SVN-side change outside of www"
+		svn_cmd log -v | grep "SVN-side change outside of www"
 	)
 '
 
@@ -64,7 +64,7 @@ test_expect_success 'update git svn-cloned repo (config include)' '
 		cd g &&
 		git svn rebase &&
 		printf "test_qqq\nb\n" > expect &&
-		for i in */*.txt; do cat $i >> expect2; done &&
+		for i in */*.txt; do cat $i >> expect2 || exit 1; done &&
 		test_cmp expect2 expect &&
 		rm expect expect2
 	)
@@ -75,7 +75,7 @@ test_expect_success 'update git svn-cloned repo (option include)' '
 		cd c &&
 		git svn rebase --include-paths="qqq" &&
 		printf "test_qqq\nb\n" > expect &&
-		for i in */*.txt; do cat $i >> expect2; done &&
+		for i in */*.txt; do cat $i >> expect2 || exit 1; done &&
 		test_cmp expect2 expect &&
 		rm expect expect2
 	)
@@ -87,7 +87,7 @@ test_expect_success 'SVN-side change inside of ignored www' '
 		echo zaq >> www/test_www.txt &&
 		svn_cmd commit -m "SVN-side change inside of www/test_www.txt" &&
 		svn_cmd up &&
-		svn_cmd log -v | fgrep "SVN-side change inside of www/test_www.txt"
+		svn_cmd log -v | grep "SVN-side change inside of www/test_www.txt"
 	)
 '
 
@@ -96,7 +96,7 @@ test_expect_success 'update git svn-cloned repo (config include)' '
 		cd g &&
 		git svn rebase &&
 		printf "test_qqq\nb\n" > expect &&
-		for i in */*.txt; do cat $i >> expect2; done &&
+		for i in */*.txt; do cat $i >> expect2 || exit 1; done &&
 		test_cmp expect2 expect &&
 		rm expect expect2
 	)
@@ -107,7 +107,7 @@ test_expect_success 'update git svn-cloned repo (option include)' '
 		cd c &&
 		git svn rebase --include-paths="qqq" &&
 		printf "test_qqq\nb\n" > expect &&
-		for i in */*.txt; do cat $i >> expect2; done &&
+		for i in */*.txt; do cat $i >> expect2 || exit 1; done &&
 		test_cmp expect2 expect &&
 		rm expect expect2
 	)
@@ -120,7 +120,7 @@ test_expect_success 'SVN-side change in and out of included qqq' '
 		echo ygg >> qqq/test_qqq.txt &&
 		svn_cmd commit -m "SVN-side change in and out of ignored www" &&
 		svn_cmd up &&
-		svn_cmd log -v | fgrep "SVN-side change in and out of ignored www"
+		svn_cmd log -v | grep "SVN-side change in and out of ignored www"
 	)
 '
 
@@ -129,7 +129,7 @@ test_expect_success 'update git svn-cloned repo again (config include)' '
 		cd g &&
 		git svn rebase &&
 		printf "test_qqq\nb\nygg\n" > expect &&
-		for i in */*.txt; do cat $i >> expect2; done &&
+		for i in */*.txt; do cat $i >> expect2 || exit 1; done &&
 		test_cmp expect2 expect &&
 		rm expect expect2
 	)
@@ -140,7 +140,7 @@ test_expect_success 'update git svn-cloned repo again (option include)' '
 		cd c &&
 		git svn rebase --include-paths="qqq" &&
 		printf "test_qqq\nb\nygg\n" > expect &&
-		for i in */*.txt; do cat $i >> expect2; done &&
+		for i in */*.txt; do cat $i >> expect2 || exit 1; done &&
 		test_cmp expect2 expect &&
 		rm expect expect2
 	)
diff --git a/t/t9148-git-svn-propset.sh b/t/t9148-git-svn-propset.sh
index 1026390..aebb289 100755
--- a/t/t9148-git-svn-propset.sh
+++ b/t/t9148-git-svn-propset.sh
@@ -7,19 +7,22 @@ test_description='git svn propset tests'
 
 . ./lib-git-svn.sh
 
-foo_subdir2="subdir/subdir2/foo_subdir2"
+test_expect_success 'setup propset via import' '
+	test_when_finished "rm -rf import" &&
 
-set -e
-mkdir import &&
-(set -e ; cd import
-	mkdir subdir
-	mkdir subdir/subdir2
-	touch foo 		# for 'add props top level'
-	touch subdir/foo_subdir # for 'add props relative'
-	touch "$foo_subdir2"	# for 'add props subdir'
-	svn_cmd import -m 'import for git svn' . "$svnrepo" >/dev/null
-)
-rm -rf import
+	foo_subdir2="subdir/subdir2/foo_subdir2" &&
+	mkdir -p import/subdir/subdir2 &&
+	(
+		cd import &&
+		# for "add props top level"
+		>foo &&
+		# for "add props relative"
+		>subdir/foo_subdir &&
+		# for "add props subdir"
+		>"$foo_subdir2" &&
+		svn_cmd import -m "import for git svn" . "$svnrepo"
+	)
+'
 
 test_expect_success 'initialize git svn' '
 	git svn init "$svnrepo"
diff --git a/t/t9151-svn-mergeinfo.sh b/t/t9151-svn-mergeinfo.sh
index 4f6c06e..c93a5be 100755
--- a/t/t9151-svn-mergeinfo.sh
+++ b/t/t9151-svn-mergeinfo.sh
@@ -9,49 +9,46 @@ test_description='git-svn svn mergeinfo properties'
 
 test_expect_success 'load svn dump' "
 	svnadmin load -q '$rawsvnrepo' \
-	  < '$TEST_DIRECTORY/t9151/svn-mergeinfo.dump' &&
+	  <'$TEST_DIRECTORY/t9151/svn-mergeinfo.dump' &&
 	git svn init --minimize-url -R svnmerge \
 	  --rewrite-root=http://svn.example.org \
 	  -T trunk -b branches '$svnrepo' &&
 	git svn fetch --all
-	"
+"
 
 test_expect_success 'all svn merges became git merge commits' '
-	unmarked=$(git rev-list --parents --all --grep=Merge |
-		grep -v " .* " | cut -f1 -d" ") &&
-	[ -z "$unmarked" ]
-	'
+	git rev-list --all --no-merges --grep=Merge >unmarked &&
+	test_must_be_empty unmarked
+'
 
 test_expect_success 'cherry picks did not become git merge commits' '
-	bad_cherries=$(git rev-list --parents --all --grep=Cherry |
-		grep " .* " | cut -f1 -d" ") &&
-	[ -z "$bad_cherries" ]
-	'
+	git rev-list --all --merges --grep=Cherry >bad-cherries &&
+	test_must_be_empty bad-cherries
+'
 
 test_expect_success 'svn non-merge merge commits did not become git merge commits' '
-	bad_non_merges=$(git rev-list --parents --all --grep=non-merge |
-		grep " .* " | cut -f1 -d" ") &&
-	[ -z "$bad_non_merges" ]
-	'
+	git rev-list --all --merges --grep=non-merge >bad-non-merges &&
+	test_must_be_empty bad-non-merges
+'
 
 test_expect_success 'commit made to merged branch is reachable from the merge' '
 	before_commit=$(git rev-list --all --grep="trunk commit before merging trunk to b2") &&
 	merge_commit=$(git rev-list --all --grep="Merge trunk to b2") &&
-	not_reachable=$(git rev-list -1 $before_commit --not $merge_commit) &&
-	[ -z "$not_reachable" ]
-	'
+	git rev-list -1 $before_commit --not $merge_commit >not-reachable &&
+	test_must_be_empty not-reachable
+'
 
 test_expect_success 'merging two branches in one commit is detected correctly' '
 	f1_commit=$(git rev-list --all --grep="make f1 branch from trunk") &&
 	f2_commit=$(git rev-list --all --grep="make f2 branch from trunk") &&
 	merge_commit=$(git rev-list --all --grep="Merge f1 and f2 to trunk") &&
-	not_reachable=$(git rev-list -1 $f1_commit $f2_commit --not $merge_commit) &&
-	[ -z "$not_reachable" ]
-	'
+	git rev-list -1 $f1_commit $f2_commit --not $merge_commit >not-reachable &&
+	test_must_be_empty not-reachable
+'
 
 test_expect_failure 'everything got merged in the end' '
-	unmerged=$(git rev-list --all --not master) &&
-	[ -z "$unmerged" ]
-	'
+	git rev-list --all --not main >unmerged &&
+	test_must_be_empty unmerged
+'
 
 test_done
diff --git a/t/t9152-svn-empty-dirs-after-gc.sh b/t/t9152-svn-empty-dirs-after-gc.sh
index 89f285d..a597c42 100755
--- a/t/t9152-svn-empty-dirs-after-gc.sh
+++ b/t/t9152-svn-empty-dirs-after-gc.sh
@@ -8,7 +8,7 @@ test_description='git svn creates empty directories, calls git gc, makes sure th
 test_expect_success 'initialize repo' '
 	for i in a b c d d/e d/e/f "weird file name"
 	do
-		svn_cmd mkdir -m "mkdir $i" "$svnrepo"/"$i"
+		svn_cmd mkdir -m "mkdir $i" "$svnrepo"/"$i" || return 1
 	done
 '
 
diff --git a/t/t9155-git-svn-fetch-deleted-tag.sh b/t/t9155-git-svn-fetch-deleted-tag.sh
index 184336f..3258374 100755
--- a/t/t9155-git-svn-fetch-deleted-tag.sh
+++ b/t/t9155-git-svn-fetch-deleted-tag.sh
@@ -2,6 +2,9 @@
 
 test_description='git svn fetch deleted tag'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./lib-git-svn.sh
 
 test_expect_success 'setup svn repo' '
@@ -36,7 +39,7 @@ test_expect_success 'fetch deleted tags from same revision with checksum error'
 	git svn fetch &&
 
 	git diff --exit-code origin/mybranch:trunk/subdir/file origin/tags/mytag:file &&
-	git diff --exit-code master:subdir/file origin/tags/mytag^:file
+	git diff --exit-code main:subdir/file origin/tags/mytag^:file
 '
 
 test_done
diff --git a/t/t9156-git-svn-fetch-deleted-tag-2.sh b/t/t9156-git-svn-fetch-deleted-tag-2.sh
index 7a6e33b..2b75c40 100755
--- a/t/t9156-git-svn-fetch-deleted-tag-2.sh
+++ b/t/t9156-git-svn-fetch-deleted-tag-2.sh
@@ -2,6 +2,9 @@
 
 test_description='git svn fetch deleted tag 2'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./lib-git-svn.sh
 
 test_expect_success 'setup svn repo' '
@@ -36,9 +39,9 @@ test_expect_success 'fetch deleted tags from same revision with no checksum erro
 	cd git_project &&
 	git svn fetch &&
 
-	git diff --exit-code master:subdir3/file origin/tags/mytag:file &&
-	git diff --exit-code master:subdir2/file origin/tags/mytag^:file &&
-	git diff --exit-code master:subdir1/file origin/tags/mytag^^:file
+	git diff --exit-code main:subdir3/file origin/tags/mytag:file &&
+	git diff --exit-code main:subdir2/file origin/tags/mytag^:file &&
+	git diff --exit-code main:subdir1/file origin/tags/mytag^^:file
 '
 
 test_done
diff --git a/t/t9162-git-svn-dcommit-interactive.sh b/t/t9162-git-svn-dcommit-interactive.sh
index e38d9fa..b3ce033 100755
--- a/t/t9162-git-svn-dcommit-interactive.sh
+++ b/t/t9162-git-svn-dcommit-interactive.sh
@@ -3,6 +3,7 @@
 # Copyright (c) 2011 Frédéric Heitzmann
 
 test_description='git svn dcommit --interactive series'
+
 . ./lib-git-svn.sh
 
 test_expect_success 'initialize repo' '
diff --git a/t/t9163-git-svn-reset-clears-caches.sh b/t/t9163-git-svn-reset-clears-caches.sh
index d6245ce..978eb62 100755
--- a/t/t9163-git-svn-reset-clears-caches.sh
+++ b/t/t9163-git-svn-reset-clears-caches.sh
@@ -4,6 +4,9 @@
 #
 
 test_description='git svn reset clears memoized caches'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./lib-git-svn.sh
 
 svn_ver="$(svn --version --quiet)"
@@ -59,7 +62,7 @@ test_expect_success 'fetch to merge-base (a)' '
 test_expect_success 'rebase looses SVN merge (m)' '
 	git svn rebase &&
 	git svn fetch &&
-	test 1 = $(git cat-file -p master|grep parent|wc -l)
+	test 1 = $(git cat-file -p main|grep parent|wc -l)
 '
 
 # git svn fetch creates correct history with merge commit
diff --git a/t/t9164-git-svn-dcommit-concurrent.sh b/t/t9164-git-svn-dcommit-concurrent.sh
index 8466269..d1dec89 100755
--- a/t/t9164-git-svn-dcommit-concurrent.sh
+++ b/t/t9164-git-svn-dcommit-concurrent.sh
@@ -4,6 +4,7 @@
 #
 
 test_description='concurrent git svn dcommit'
+
 . ./lib-git-svn.sh
 
 
@@ -45,6 +46,14 @@ setup_hook()
 			"passed to setup_hook" >&2 ; return 1; }
 	echo "cnt=$skip_revs" > "$hook_type-counter"
 	rm -f "$rawsvnrepo/hooks/"*-commit # drop previous hooks
+
+	# Subversion hooks run with an empty environment by default. We thus
+	# need to propagate PATH so that we can find executables.
+	cat >"$rawsvnrepo/conf/hooks-env" <<-EOF
+	[default]
+	PATH = ${PATH}
+	EOF
+
 	hook="$rawsvnrepo/hooks/$hook_type"
 	cat > "$hook" <<- 'EOF1'
 		#!/bin/sh
@@ -62,7 +71,6 @@ EOF1
 	if [ "$hook_type" = "pre-commit" ]; then
 		echo "echo 'commit disallowed' >&2; exit 1" >>"$hook"
 	else
-		echo "PATH=\"$PATH\"; export PATH" >>"$hook"
 		echo "svnconf=\"$svnconf\"" >>"$hook"
 		cat >>"$hook" <<- 'EOF2'
 			cd work-auto-commits.svn
diff --git a/t/t9167-git-svn-cmd-branch-subproject.sh b/t/t9167-git-svn-cmd-branch-subproject.sh
index ba35fc0..d812843 100755
--- a/t/t9167-git-svn-cmd-branch-subproject.sh
+++ b/t/t9167-git-svn-cmd-branch-subproject.sh
@@ -4,6 +4,7 @@
 #
 
 test_description='git svn branch for subproject clones'
+
 . ./lib-git-svn.sh
 
 test_expect_success 'initialize svnrepo' '
diff --git a/t/t9169-git-svn-dcommit-crlf.sh b/t/t9169-git-svn-dcommit-crlf.sh
index 54b1f61..7080b5d 100755
--- a/t/t9169-git-svn-dcommit-crlf.sh
+++ b/t/t9169-git-svn-dcommit-crlf.sh
@@ -1,6 +1,9 @@
 #!/bin/sh
 
 test_description='git svn dcommit CRLF'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./lib-git-svn.sh
 
 test_expect_success 'setup commit repository' '
@@ -14,7 +17,7 @@ test_expect_success 'setup commit repository' '
 		p=$(git rev-parse HEAD) &&
 		t=$(git write-tree) &&
 		cmt=$(git commit-tree -p $p $t <cmt) &&
-		git update-ref refs/heads/master $cmt &&
+		git update-ref refs/heads/main $cmt &&
 		git cat-file commit HEAD | tail -n4 >out &&
 		test_cmp cmt out &&
 		git svn dcommit &&
diff --git a/t/t9200-git-cvsexportcommit.sh b/t/t9200-git-cvsexportcommit.sh
index c5946cb..a44eabf 100755
--- a/t/t9200-git-cvsexportcommit.sh
+++ b/t/t9200-git-cvsexportcommit.sh
@@ -50,56 +50,56 @@ check_entries () {
 	fi
 }
 
-test_expect_success \
-    'New file' \
-    'mkdir A B C D E F &&
-     echo hello1 >A/newfile1.txt &&
-     echo hello2 >B/newfile2.txt &&
-     cp "$TEST_DIRECTORY"/test-binary-1.png C/newfile3.png &&
-     cp "$TEST_DIRECTORY"/test-binary-1.png D/newfile4.png &&
-     git add A/newfile1.txt &&
-     git add B/newfile2.txt &&
-     git add C/newfile3.png &&
-     git add D/newfile4.png &&
-     git commit -a -m "Test: New file" &&
-     id=$(git rev-list --max-count=1 HEAD) &&
-     (cd "$CVSWORK" &&
-     git cvsexportcommit -c $id &&
-     check_entries A "newfile1.txt/1.1/" &&
-     check_entries B "newfile2.txt/1.1/" &&
-     check_entries C "newfile3.png/1.1/-kb" &&
-     check_entries D "newfile4.png/1.1/-kb" &&
-     test_cmp A/newfile1.txt ../A/newfile1.txt &&
-     test_cmp B/newfile2.txt ../B/newfile2.txt &&
-     test_cmp C/newfile3.png ../C/newfile3.png &&
-     test_cmp D/newfile4.png ../D/newfile4.png
-     )'
+test_expect_success 'New file' '
+	mkdir A B C D E F &&
+	echo hello1 >A/newfile1.txt &&
+	echo hello2 >B/newfile2.txt &&
+	cp "$TEST_DIRECTORY"/test-binary-1.png C/newfile3.png &&
+	cp "$TEST_DIRECTORY"/test-binary-1.png D/newfile4.png &&
+	git add A/newfile1.txt &&
+	git add B/newfile2.txt &&
+	git add C/newfile3.png &&
+	git add D/newfile4.png &&
+	git commit -a -m "Test: New file" &&
+	id=$(git rev-list --max-count=1 HEAD) &&
+	(cd "$CVSWORK" &&
+	git cvsexportcommit -c $id &&
+	check_entries A "newfile1.txt/1.1/" &&
+	check_entries B "newfile2.txt/1.1/" &&
+	check_entries C "newfile3.png/1.1/-kb" &&
+	check_entries D "newfile4.png/1.1/-kb" &&
+	test_cmp A/newfile1.txt ../A/newfile1.txt &&
+	test_cmp B/newfile2.txt ../B/newfile2.txt &&
+	test_cmp C/newfile3.png ../C/newfile3.png &&
+	test_cmp D/newfile4.png ../D/newfile4.png
+	)
+'
 
-test_expect_success \
-    'Remove two files, add two and update two' \
-    'echo Hello1 >>A/newfile1.txt &&
-     rm -f B/newfile2.txt &&
-     rm -f C/newfile3.png &&
-     echo Hello5  >E/newfile5.txt &&
-     cp "$TEST_DIRECTORY"/test-binary-2.png D/newfile4.png &&
-     cp "$TEST_DIRECTORY"/test-binary-1.png F/newfile6.png &&
-     git add E/newfile5.txt &&
-     git add F/newfile6.png &&
-     git commit -a -m "Test: Remove, add and update" &&
-     id=$(git rev-list --max-count=1 HEAD) &&
-     (cd "$CVSWORK" &&
-     git cvsexportcommit -c $id &&
-     check_entries A "newfile1.txt/1.2/" &&
-     check_entries B "" &&
-     check_entries C "" &&
-     check_entries D "newfile4.png/1.2/-kb" &&
-     check_entries E "newfile5.txt/1.1/" &&
-     check_entries F "newfile6.png/1.1/-kb" &&
-     test_cmp A/newfile1.txt ../A/newfile1.txt &&
-     test_cmp D/newfile4.png ../D/newfile4.png &&
-     test_cmp E/newfile5.txt ../E/newfile5.txt &&
-     test_cmp F/newfile6.png ../F/newfile6.png
-     )'
+test_expect_success 'Remove two files, add two and update two' '
+	echo Hello1 >>A/newfile1.txt &&
+	rm -f B/newfile2.txt &&
+	rm -f C/newfile3.png &&
+	echo Hello5  >E/newfile5.txt &&
+	cp "$TEST_DIRECTORY"/test-binary-2.png D/newfile4.png &&
+	cp "$TEST_DIRECTORY"/test-binary-1.png F/newfile6.png &&
+	git add E/newfile5.txt &&
+	git add F/newfile6.png &&
+	git commit -a -m "Test: Remove, add and update" &&
+	id=$(git rev-list --max-count=1 HEAD) &&
+	(cd "$CVSWORK" &&
+	git cvsexportcommit -c $id &&
+	check_entries A "newfile1.txt/1.2/" &&
+	check_entries B "" &&
+	check_entries C "" &&
+	check_entries D "newfile4.png/1.2/-kb" &&
+	check_entries E "newfile5.txt/1.1/" &&
+	check_entries F "newfile6.png/1.1/-kb" &&
+	test_cmp A/newfile1.txt ../A/newfile1.txt &&
+	test_cmp D/newfile4.png ../D/newfile4.png &&
+	test_cmp E/newfile5.txt ../E/newfile5.txt &&
+	test_cmp F/newfile6.png ../F/newfile6.png
+	)
+'
 
 # Should fail (but only on the git cvsexportcommit stage)
 test_expect_success \
@@ -129,67 +129,67 @@ test_expect_success \
 
 # This test is here because a patch for only binary files will
 # fail with gnu patch, so cvsexportcommit must handle that.
-test_expect_success \
-    'Remove only binary files' \
-    'git reset --hard HEAD^^ &&
-     rm -f D/newfile4.png &&
-     git commit -a -m "test: remove only a binary file" &&
-     id=$(git rev-list --max-count=1 HEAD) &&
-     (cd "$CVSWORK" &&
-     git cvsexportcommit -c $id &&
-     check_entries A "newfile1.txt/1.2/" &&
-     check_entries B "" &&
-     check_entries C "" &&
-     check_entries D "" &&
-     check_entries E "newfile5.txt/1.1/" &&
-     check_entries F "newfile6.png/1.1/-kb" &&
-     test_cmp A/newfile1.txt ../A/newfile1.txt &&
-     test_cmp E/newfile5.txt ../E/newfile5.txt &&
-     test_cmp F/newfile6.png ../F/newfile6.png
-     )'
+test_expect_success 'Remove only binary files' '
+	git reset --hard HEAD^^ &&
+	rm -f D/newfile4.png &&
+	git commit -a -m "test: remove only a binary file" &&
+	id=$(git rev-list --max-count=1 HEAD) &&
+	(cd "$CVSWORK" &&
+	git cvsexportcommit -c $id &&
+	check_entries A "newfile1.txt/1.2/" &&
+	check_entries B "" &&
+	check_entries C "" &&
+	check_entries D "" &&
+	check_entries E "newfile5.txt/1.1/" &&
+	check_entries F "newfile6.png/1.1/-kb" &&
+	test_cmp A/newfile1.txt ../A/newfile1.txt &&
+	test_cmp E/newfile5.txt ../E/newfile5.txt &&
+	test_cmp F/newfile6.png ../F/newfile6.png
+	)
+'
 
-test_expect_success \
-    'Remove only a text file' \
-    'rm -f A/newfile1.txt &&
-     git commit -a -m "test: remove only a binary file" &&
-     id=$(git rev-list --max-count=1 HEAD) &&
-     (cd "$CVSWORK" &&
-     git cvsexportcommit -c $id &&
-     check_entries A "" &&
-     check_entries B "" &&
-     check_entries C "" &&
-     check_entries D "" &&
-     check_entries E "newfile5.txt/1.1/" &&
-     check_entries F "newfile6.png/1.1/-kb" &&
-     test_cmp E/newfile5.txt ../E/newfile5.txt &&
-     test_cmp F/newfile6.png ../F/newfile6.png
-     )'
+test_expect_success 'Remove only a text file' '
+	rm -f A/newfile1.txt &&
+	git commit -a -m "test: remove only a binary file" &&
+	id=$(git rev-list --max-count=1 HEAD) &&
+	(cd "$CVSWORK" &&
+	git cvsexportcommit -c $id &&
+	check_entries A "" &&
+	check_entries B "" &&
+	check_entries C "" &&
+	check_entries D "" &&
+	check_entries E "newfile5.txt/1.1/" &&
+	check_entries F "newfile6.png/1.1/-kb" &&
+	test_cmp E/newfile5.txt ../E/newfile5.txt &&
+	test_cmp F/newfile6.png ../F/newfile6.png
+	)
+'
 
-test_expect_success \
-     'New file with spaces in file name' \
-     'mkdir "G g" &&
-      echo ok then >"G g/with spaces.txt" &&
-      git add "G g/with spaces.txt" && \
-      cp "$TEST_DIRECTORY"/test-binary-1.png "G g/with spaces.png" && \
-      git add "G g/with spaces.png" &&
-      git commit -a -m "With spaces" &&
-      id=$(git rev-list --max-count=1 HEAD) &&
-      (cd "$CVSWORK" &&
-      git cvsexportcommit -c $id &&
-      check_entries "G g" "with spaces.png/1.1/-kb|with spaces.txt/1.1/"
-      )'
+test_expect_success 'New file with spaces in file name' '
+	mkdir "G g" &&
+	echo ok then >"G g/with spaces.txt" &&
+	git add "G g/with spaces.txt" && \
+	cp "$TEST_DIRECTORY"/test-binary-1.png "G g/with spaces.png" && \
+	git add "G g/with spaces.png" &&
+	git commit -a -m "With spaces" &&
+	id=$(git rev-list --max-count=1 HEAD) &&
+	(cd "$CVSWORK" &&
+	git cvsexportcommit -c $id &&
+	check_entries "G g" "with spaces.png/1.1/-kb|with spaces.txt/1.1/"
+	)
+'
 
-test_expect_success \
-     'Update file with spaces in file name' \
-     'echo Ok then >>"G g/with spaces.txt" &&
-      cat "$TEST_DIRECTORY"/test-binary-1.png >>"G g/with spaces.png" && \
-      git add "G g/with spaces.png" &&
-      git commit -a -m "Update with spaces" &&
-      id=$(git rev-list --max-count=1 HEAD) &&
-      (cd "$CVSWORK" &&
-      git cvsexportcommit -c $id &&
-      check_entries "G g" "with spaces.png/1.2/-kb|with spaces.txt/1.2/"
-      )'
+test_expect_success 'Update file with spaces in file name' '
+	echo Ok then >>"G g/with spaces.txt" &&
+	cat "$TEST_DIRECTORY"/test-binary-1.png >>"G g/with spaces.png" && \
+	git add "G g/with spaces.png" &&
+	git commit -a -m "Update with spaces" &&
+	id=$(git rev-list --max-count=1 HEAD) &&
+	(cd "$CVSWORK" &&
+	git cvsexportcommit -c $id &&
+	check_entries "G g" "with spaces.png/1.2/-kb|with spaces.txt/1.2/"
+	)
+'
 
 # Some filesystems mangle pathnames with UTF-8 characters --
 # check and skip
@@ -202,68 +202,68 @@ if p="Å/goo/a/b/c/d/e/f/g/h/i/j/k/l/m/n/o/p/q/r/s/t/u/v/w/x/y/z/å/ä/ö" &&
 then
 
 # This test contains UTF-8 characters
-test_expect_success !MINGW \
-     'File with non-ascii file name' \
-     'mkdir -p Å/goo/a/b/c/d/e/f/g/h/i/j/k/l/m/n/o/p/q/r/s/t/u/v/w/x/y/z/å/ä/ö &&
-      echo Foo >Å/goo/a/b/c/d/e/f/g/h/i/j/k/l/m/n/o/p/q/r/s/t/u/v/w/x/y/z/å/ä/ö/gårdetsågårdet.txt &&
-      git add Å/goo/a/b/c/d/e/f/g/h/i/j/k/l/m/n/o/p/q/r/s/t/u/v/w/x/y/z/å/ä/ö/gårdetsågårdet.txt &&
-      cp "$TEST_DIRECTORY"/test-binary-1.png Å/goo/a/b/c/d/e/f/g/h/i/j/k/l/m/n/o/p/q/r/s/t/u/v/w/x/y/z/å/ä/ö/gårdetsågårdet.png &&
-      git add Å/goo/a/b/c/d/e/f/g/h/i/j/k/l/m/n/o/p/q/r/s/t/u/v/w/x/y/z/å/ä/ö/gårdetsågårdet.png &&
-      git commit -a -m "Går det så går det" && \
-      id=$(git rev-list --max-count=1 HEAD) &&
-      (cd "$CVSWORK" &&
-      git cvsexportcommit -v -c $id &&
-      check_entries \
-      "Å/goo/a/b/c/d/e/f/g/h/i/j/k/l/m/n/o/p/q/r/s/t/u/v/w/x/y/z/å/ä/ö" \
-      "gårdetsågårdet.png/1.1/-kb|gårdetsågårdet.txt/1.1/"
-      )'
+test_expect_success !MINGW 'File with non-ascii file name' '
+	mkdir -p Å/goo/a/b/c/d/e/f/g/h/i/j/k/l/m/n/o/p/q/r/s/t/u/v/w/x/y/z/å/ä/ö &&
+	echo Foo >Å/goo/a/b/c/d/e/f/g/h/i/j/k/l/m/n/o/p/q/r/s/t/u/v/w/x/y/z/å/ä/ö/gårdetsågårdet.txt &&
+	git add Å/goo/a/b/c/d/e/f/g/h/i/j/k/l/m/n/o/p/q/r/s/t/u/v/w/x/y/z/å/ä/ö/gårdetsågårdet.txt &&
+	cp "$TEST_DIRECTORY"/test-binary-1.png Å/goo/a/b/c/d/e/f/g/h/i/j/k/l/m/n/o/p/q/r/s/t/u/v/w/x/y/z/å/ä/ö/gårdetsågårdet.png &&
+	git add Å/goo/a/b/c/d/e/f/g/h/i/j/k/l/m/n/o/p/q/r/s/t/u/v/w/x/y/z/å/ä/ö/gårdetsågårdet.png &&
+	git commit -a -m "Går det så går det" && \
+	id=$(git rev-list --max-count=1 HEAD) &&
+	(cd "$CVSWORK" &&
+	git cvsexportcommit -v -c $id &&
+	check_entries \
+	"Å/goo/a/b/c/d/e/f/g/h/i/j/k/l/m/n/o/p/q/r/s/t/u/v/w/x/y/z/å/ä/ö" \
+	"gårdetsågårdet.png/1.1/-kb|gårdetsågårdet.txt/1.1/"
+	)
+'
 
 fi
 
 rm -fr tst
 
-test_expect_success \
-     'Mismatching patch should fail' \
-     'date >>"E/newfile5.txt" &&
-      git add "E/newfile5.txt" &&
-      git commit -a -m "Update one" &&
-      date >>"E/newfile5.txt" &&
-      git add "E/newfile5.txt" &&
-      git commit -a -m "Update two" &&
-      id=$(git rev-list --max-count=1 HEAD) &&
-      (cd "$CVSWORK" &&
-      test_must_fail git cvsexportcommit -c $id
-      )'
-
-test_expect_success FILEMODE \
-     'Retain execute bit' \
-     'mkdir G &&
-      echo executeon >G/on &&
-      chmod +x G/on &&
-      echo executeoff >G/off &&
-      git add G/on &&
-      git add G/off &&
-      git commit -a -m "Execute test" &&
-      (cd "$CVSWORK" &&
-      git cvsexportcommit -c HEAD &&
-      test -x G/on &&
-      ! test -x G/off
-      )'
+test_expect_success 'Mismatching patch should fail' '
+	date >>"E/newfile5.txt" &&
+	git add "E/newfile5.txt" &&
+	git commit -a -m "Update one" &&
+	date >>"E/newfile5.txt" &&
+	git add "E/newfile5.txt" &&
+	git commit -a -m "Update two" &&
+	id=$(git rev-list --max-count=1 HEAD) &&
+	(cd "$CVSWORK" &&
+	test_must_fail git cvsexportcommit -c $id
+	)
+'
+
+test_expect_success FILEMODE 'Retain execute bit' '
+	mkdir G &&
+	echo executeon >G/on &&
+	chmod +x G/on &&
+	echo executeoff >G/off &&
+	git add G/on &&
+	git add G/off &&
+	git commit -a -m "Execute test" &&
+	(cd "$CVSWORK" &&
+	git cvsexportcommit -c HEAD &&
+	test -x G/on &&
+	! test -x G/off
+	)
+'
 
 test_expect_success '-w option should work with relative GIT_DIR' '
-      mkdir W &&
-      echo foobar >W/file1.txt &&
-      echo bazzle >W/file2.txt &&
-      git add W/file1.txt &&
-      git add W/file2.txt &&
-      git commit -m "More updates" &&
-      id=$(git rev-list --max-count=1 HEAD) &&
-      (cd "$GIT_DIR" &&
-      GIT_DIR=. git cvsexportcommit -w "$CVSWORK" -c $id &&
-      check_entries "$CVSWORK/W" "file1.txt/1.1/|file2.txt/1.1/" &&
-      test_cmp "$CVSWORK/W/file1.txt" ../W/file1.txt &&
-      test_cmp "$CVSWORK/W/file2.txt" ../W/file2.txt
-      )
+	mkdir W &&
+	echo foobar >W/file1.txt &&
+	echo bazzle >W/file2.txt &&
+	git add W/file1.txt &&
+	git add W/file2.txt &&
+	git commit -m "More updates" &&
+	id=$(git rev-list --max-count=1 HEAD) &&
+	(cd "$GIT_DIR" &&
+	GIT_DIR=. git cvsexportcommit -w "$CVSWORK" -c $id &&
+	check_entries "$CVSWORK/W" "file1.txt/1.1/|file2.txt/1.1/" &&
+	test_cmp "$CVSWORK/W/file1.txt" ../W/file1.txt &&
+	test_cmp "$CVSWORK/W/file2.txt" ../W/file2.txt
+	)
 '
 
 test_expect_success 'check files before directories' '
@@ -290,21 +290,20 @@ test_expect_success 'check files before directories' '
 '
 
 test_expect_success 're-commit a removed filename which remains in CVS attic' '
-
-    (cd "$CVSWORK" &&
-     echo >attic_gremlin &&
-     cvs -Q add attic_gremlin &&
-     cvs -Q ci -m "added attic_gremlin" &&
-     rm attic_gremlin &&
-     cvs -Q rm attic_gremlin &&
-     cvs -Q ci -m "removed attic_gremlin") &&
-
-    echo > attic_gremlin &&
-    git add attic_gremlin &&
-    git commit -m "Added attic_gremlin" &&
+	(cd "$CVSWORK" &&
+	echo >attic_gremlin &&
+	cvs -Q add attic_gremlin &&
+	cvs -Q ci -m "added attic_gremlin" &&
+	rm attic_gremlin &&
+	cvs -Q rm attic_gremlin &&
+	cvs -Q ci -m "removed attic_gremlin") &&
+
+	echo > attic_gremlin &&
+	git add attic_gremlin &&
+	git commit -m "Added attic_gremlin" &&
 	git cvsexportcommit -w "$CVSWORK" -c HEAD &&
-    (cd "$CVSWORK" && cvs -Q update -d) &&
-    test -f "$CVSWORK/attic_gremlin"
+	(cd "$CVSWORK" && cvs -Q update -d) &&
+	test -f "$CVSWORK/attic_gremlin"
 '
 
 # the state of the CVS sandbox may be indeterminate for ' space'
diff --git a/t/t9210-scalar.sh b/t/t9210-scalar.sh
new file mode 100755
index 0000000..428339e
--- /dev/null
+++ b/t/t9210-scalar.sh
@@ -0,0 +1,241 @@
+#!/bin/sh
+
+test_description='test the `scalar` command'
+
+. ./test-lib.sh
+
+GIT_TEST_MAINT_SCHEDULER="crontab:test-tool crontab cron.txt,launchctl:true,schtasks:true"
+export GIT_TEST_MAINT_SCHEDULER
+
+test_expect_success 'scalar shows a usage' '
+	test_expect_code 129 scalar -h
+'
+
+test_expect_success 'scalar invoked on enlistment root' '
+	test_when_finished rm -rf test src deeper &&
+
+	for enlistment_root in test src deeper/test
+	do
+		git init ${enlistment_root}/src &&
+
+		# Register
+		scalar register ${enlistment_root} &&
+		scalar list >out &&
+		grep "$(pwd)/${enlistment_root}/src\$" out &&
+
+		# Delete (including enlistment root)
+		scalar delete $enlistment_root &&
+		test_path_is_missing $enlistment_root &&
+		scalar list >out &&
+		! grep "^$(pwd)/${enlistment_root}/src\$" out || return 1
+	done
+'
+
+test_expect_success 'scalar invoked on enlistment src repo' '
+	test_when_finished rm -rf test src deeper &&
+
+	for enlistment_root in test src deeper/test
+	do
+		git init ${enlistment_root}/src &&
+
+		# Register
+		scalar register ${enlistment_root}/src &&
+		scalar list >out &&
+		grep "$(pwd)/${enlistment_root}/src\$" out &&
+
+		# Delete (will not include enlistment root)
+		scalar delete ${enlistment_root}/src &&
+		test_path_is_dir $enlistment_root &&
+		scalar list >out &&
+		! grep "^$(pwd)/${enlistment_root}/src\$" out || return 1
+	done
+'
+
+test_expect_success 'scalar invoked when enlistment root and repo are the same' '
+	test_when_finished rm -rf test src deeper &&
+
+	for enlistment_root in test src deeper/test
+	do
+		git init ${enlistment_root} &&
+
+		# Register
+		scalar register ${enlistment_root} &&
+		scalar list >out &&
+		grep "$(pwd)/${enlistment_root}\$" out &&
+
+		# Delete (will not include enlistment root)
+		scalar delete ${enlistment_root} &&
+		test_path_is_missing $enlistment_root &&
+		scalar list >out &&
+		! grep "^$(pwd)/${enlistment_root}\$" out &&
+
+		# Make sure we did not accidentally delete the trash dir
+		test_path_is_dir "$TRASH_DIRECTORY" || return 1
+	done
+'
+
+test_expect_success 'scalar repo search respects GIT_CEILING_DIRECTORIES' '
+	test_when_finished rm -rf test &&
+
+	git init test/src &&
+	mkdir -p test/src/deep &&
+	GIT_CEILING_DIRECTORIES="$(pwd)/test/src" &&
+	! scalar register test/src/deep 2>err &&
+	grep "not a git repository" err
+'
+
+test_expect_success 'scalar enlistments need a worktree' '
+	test_when_finished rm -rf bare test &&
+
+	git init --bare bare/src &&
+	! scalar register bare/src 2>err &&
+	grep "Scalar enlistments require a worktree" err &&
+
+	git init test/src &&
+	! scalar register test/src/.git 2>err &&
+	grep "Scalar enlistments require a worktree" err
+'
+
+test_expect_success FSMONITOR_DAEMON 'scalar register starts fsmon daemon' '
+	git init test/src &&
+	test_must_fail git -C test/src fsmonitor--daemon status &&
+	scalar register test/src &&
+	git -C test/src fsmonitor--daemon status &&
+	test_cmp_config -C test/src true core.fsmonitor
+'
+
+test_expect_success 'scalar register warns when background maintenance fails' '
+	git init register-repo &&
+	GIT_TEST_MAINT_SCHEDULER="crontab:false,launchctl:false,schtasks:false" \
+		scalar register register-repo 2>err &&
+	grep "could not turn on maintenance" err
+'
+
+test_expect_success 'scalar unregister' '
+	git init vanish/src &&
+	scalar register vanish/src &&
+	git config --get --global --fixed-value \
+		maintenance.repo "$(pwd)/vanish/src" &&
+	scalar list >scalar.repos &&
+	grep -F "$(pwd)/vanish/src" scalar.repos &&
+	rm -rf vanish/src/.git &&
+	scalar unregister vanish &&
+	test_must_fail git config --get --global --fixed-value \
+		maintenance.repo "$(pwd)/vanish/src" &&
+	scalar list >scalar.repos &&
+	! grep -F "$(pwd)/vanish/src" scalar.repos &&
+
+	# scalar unregister should be idempotent
+	scalar unregister vanish
+'
+
+test_expect_success 'set up repository to clone' '
+	test_commit first &&
+	test_commit second &&
+	test_commit third &&
+	git switch -c parallel first &&
+	mkdir -p 1/2 &&
+	test_commit 1/2/3 &&
+	git config uploadPack.allowFilter true &&
+	git config uploadPack.allowAnySHA1InWant true
+'
+
+test_expect_success 'scalar clone' '
+	second=$(git rev-parse --verify second:second.t) &&
+	scalar clone "file://$(pwd)" cloned --single-branch &&
+	(
+		cd cloned/src &&
+
+		git config --get --global --fixed-value maintenance.repo \
+			"$(pwd)" &&
+
+		git for-each-ref --format="%(refname)" refs/remotes/origin/ >actual &&
+		echo "refs/remotes/origin/parallel" >expect &&
+		test_cmp expect actual &&
+
+		test_path_is_missing 1/2 &&
+
+		# This relies on the fact that the presence of "--missing"
+		# on the command line forces lazy fetching off before
+		# "$second^{blob}" gets parsed.  Without "^{blob}", a
+		# bare object name "$second" is taken into the queue and
+		# the command may not fail with a fixed "rev-list --missing".
+		test_must_fail git rev-list --missing=print "$second^{blob}" -- &&
+
+		git rev-list $second &&
+		git cat-file blob $second >actual &&
+		echo "second" >expect &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'scalar reconfigure' '
+	git init one/src &&
+	scalar register one &&
+	git -C one/src config core.preloadIndex false &&
+	scalar reconfigure one &&
+	test true = "$(git -C one/src config core.preloadIndex)" &&
+	git -C one/src config core.preloadIndex false &&
+	scalar reconfigure -a &&
+	test true = "$(git -C one/src config core.preloadIndex)"
+'
+
+test_expect_success '`reconfigure -a` removes stale config entries' '
+	git init stale/src &&
+	scalar register stale &&
+	scalar list >scalar.repos &&
+	grep stale scalar.repos &&
+
+	grep -v stale scalar.repos >expect &&
+
+	rm -rf stale &&
+	scalar reconfigure -a &&
+	scalar list >scalar.repos &&
+	test_cmp expect scalar.repos
+'
+
+test_expect_success 'scalar delete without enlistment shows a usage' '
+	test_expect_code 129 scalar delete
+'
+
+test_expect_success 'scalar delete with enlistment' '
+	scalar delete cloned &&
+	test_path_is_missing cloned
+'
+
+test_expect_success 'scalar supports -c/-C' '
+	test_when_finished "scalar delete sub" &&
+	git init sub &&
+	scalar -C sub -c status.aheadBehind=bogus register &&
+	test -z "$(git -C sub config --local status.aheadBehind)" &&
+	test true = "$(git -C sub config core.preloadIndex)"
+'
+
+test_expect_success '`scalar [...] <dir>` errors out when dir is missing' '
+	! scalar run config cloned 2>err &&
+	grep "cloned. does not exist" err
+'
+
+SQ="'"
+test_expect_success UNZIP 'scalar diagnose' '
+	scalar clone "file://$(pwd)" cloned --single-branch &&
+	git repack &&
+	echo "$(pwd)/.git/objects/" >>cloned/src/.git/objects/info/alternates &&
+	test_commit -C cloned/src loose &&
+	scalar diagnose cloned >out 2>err &&
+	grep "Available space" out &&
+	sed -n "s/.*$SQ\\(.*\\.zip\\)$SQ.*/\\1/p" <err >zip_path &&
+	zip_path=$(cat zip_path) &&
+	test -n "$zip_path" &&
+	"$GIT_UNZIP" -v "$zip_path" &&
+	folder=${zip_path%.zip} &&
+	test_path_is_missing "$folder" &&
+	"$GIT_UNZIP" -p "$zip_path" diagnostics.log >out &&
+	test_file_not_empty out &&
+	"$GIT_UNZIP" -p "$zip_path" packs-local.txt >out &&
+	grep "$(pwd)/.git/objects" out &&
+	"$GIT_UNZIP" -p "$zip_path" objects-local.txt >out &&
+	grep "^Total: [1-9]" out
+'
+
+test_done
diff --git a/t/t9211-scalar-clone.sh b/t/t9211-scalar-clone.sh
new file mode 100755
index 0000000..7869f45
--- /dev/null
+++ b/t/t9211-scalar-clone.sh
@@ -0,0 +1,195 @@
+#!/bin/sh
+
+test_description='test the `scalar clone` subcommand'
+
+. ./test-lib.sh
+. "${TEST_DIRECTORY}/lib-terminal.sh"
+
+GIT_TEST_MAINT_SCHEDULER="crontab:test-tool crontab cron.txt,launchctl:true,schtasks:true"
+export GIT_TEST_MAINT_SCHEDULER
+
+test_expect_success 'set up repository to clone' '
+	rm -rf .git &&
+	git init to-clone &&
+	(
+		cd to-clone &&
+		git branch -m base &&
+
+		test_commit first &&
+		test_commit second &&
+		test_commit third &&
+
+		git switch -c parallel first &&
+		mkdir -p 1/2 &&
+		test_commit 1/2/3 &&
+
+		git switch base &&
+
+		# By default, permit
+		git config uploadpack.allowfilter true &&
+		git config uploadpack.allowanysha1inwant true
+	)
+'
+
+cleanup_clone () {
+	rm -rf "$1"
+}
+
+test_expect_success 'creates content in enlistment root' '
+	enlistment=cloned &&
+
+	scalar clone "file://$(pwd)/to-clone" $enlistment &&
+	ls -A $enlistment >enlistment-root &&
+	test_line_count = 1 enlistment-root &&
+	test_path_is_dir $enlistment/src &&
+	test_path_is_dir $enlistment/src/.git &&
+
+	cleanup_clone $enlistment
+'
+
+test_expect_success 'with spaces' '
+	enlistment="cloned with space" &&
+
+	scalar clone "file://$(pwd)/to-clone" "$enlistment" &&
+	test_path_is_dir "$enlistment" &&
+	test_path_is_dir "$enlistment/src" &&
+	test_path_is_dir "$enlistment/src/.git" &&
+
+	cleanup_clone "$enlistment"
+'
+
+test_expect_success 'partial clone if supported by server' '
+	enlistment=partial-clone &&
+
+	scalar clone "file://$(pwd)/to-clone" $enlistment &&
+
+	(
+		cd $enlistment/src &&
+
+		# Two promisor packs: one for refs, the other for blobs
+		ls .git/objects/pack/pack-*.promisor >promisorlist &&
+		test_line_count = 2 promisorlist
+	) &&
+
+	cleanup_clone $enlistment
+'
+
+test_expect_success 'fall back on full clone if partial unsupported' '
+	enlistment=no-partial-support &&
+
+	test_config -C to-clone uploadpack.allowfilter false &&
+	test_config -C to-clone uploadpack.allowanysha1inwant false &&
+
+	scalar clone "file://$(pwd)/to-clone" $enlistment 2>err &&
+	grep "filtering not recognized by server, ignoring" err &&
+
+	(
+		cd $enlistment/src &&
+
+		# Still get a refs promisor file, but none for blobs
+		ls .git/objects/pack/pack-*.promisor >promisorlist &&
+		test_line_count = 1 promisorlist
+	) &&
+
+	cleanup_clone $enlistment
+'
+
+test_expect_success 'initializes sparse-checkout by default' '
+	enlistment=sparse &&
+
+	scalar clone "file://$(pwd)/to-clone" $enlistment &&
+	(
+		cd $enlistment/src &&
+		test_cmp_config true core.sparseCheckout &&
+		test_cmp_config true core.sparseCheckoutCone
+	) &&
+
+	cleanup_clone $enlistment
+'
+
+test_expect_success '--full-clone does not create sparse-checkout' '
+	enlistment=full-clone &&
+
+	scalar clone --full-clone "file://$(pwd)/to-clone" $enlistment &&
+	(
+		cd $enlistment/src &&
+		test_cmp_config "" --default "" core.sparseCheckout &&
+		test_cmp_config "" --default "" core.sparseCheckoutCone
+	) &&
+
+	cleanup_clone $enlistment
+'
+
+test_expect_success '--single-branch clones HEAD only' '
+	enlistment=single-branch &&
+
+	scalar clone --single-branch "file://$(pwd)/to-clone" $enlistment &&
+	(
+		cd $enlistment/src &&
+		git for-each-ref refs/remotes/origin >out &&
+		test_line_count = 1 out &&
+		grep "refs/remotes/origin/base" out
+	) &&
+
+	cleanup_clone $enlistment
+'
+
+test_expect_success '--no-single-branch clones all branches' '
+	enlistment=no-single-branch &&
+
+	scalar clone --no-single-branch "file://$(pwd)/to-clone" $enlistment &&
+	(
+		cd $enlistment/src &&
+		git for-each-ref refs/remotes/origin >out &&
+		test_line_count = 2 out &&
+		grep "refs/remotes/origin/base" out &&
+		grep "refs/remotes/origin/parallel" out
+	) &&
+
+	cleanup_clone $enlistment
+'
+
+test_expect_success TTY 'progress with tty' '
+	enlistment=progress1 &&
+
+	test_config -C to-clone uploadpack.allowfilter true &&
+	test_config -C to-clone uploadpack.allowanysha1inwant true &&
+
+	test_terminal env GIT_PROGRESS_DELAY=0 \
+		scalar clone "file://$(pwd)/to-clone" "$enlistment" 2>stderr &&
+	grep "Enumerating objects" stderr >actual &&
+	test_line_count = 2 actual &&
+	cleanup_clone $enlistment
+'
+
+test_expect_success 'progress without tty' '
+	enlistment=progress2 &&
+
+	test_config -C to-clone uploadpack.allowfilter true &&
+	test_config -C to-clone uploadpack.allowanysha1inwant true &&
+
+	GIT_PROGRESS_DELAY=0 scalar clone "file://$(pwd)/to-clone" "$enlistment" 2>stderr &&
+	! grep "Enumerating objects" stderr &&
+	! grep "Updating files" stderr &&
+	cleanup_clone $enlistment
+'
+
+test_expect_success 'scalar clone warns when background maintenance fails' '
+	GIT_TEST_MAINT_SCHEDULER="crontab:false,launchctl:false,schtasks:false" \
+		scalar clone "file://$(pwd)/to-clone" maint-fail 2>err &&
+	grep "could not turn on maintenance" err
+'
+
+test_expect_success '`scalar clone --no-src`' '
+	scalar clone --src "file://$(pwd)/to-clone" with-src &&
+	scalar clone --no-src "file://$(pwd)/to-clone" without-src &&
+
+	test_path_is_dir with-src/src &&
+	test_path_is_missing without-src/src &&
+
+	(cd with-src/src && ls ?*) >with &&
+	(cd without-src && ls ?*) >without &&
+	test_cmp with without
+'
+
+test_done
diff --git a/t/t9300-fast-import.sh b/t/t9300-fast-import.sh
index 308c1ef..60e30fe 100755
--- a/t/t9300-fast-import.sh
+++ b/t/t9300-fast-import.sh
@@ -4,8 +4,11 @@
 #
 
 test_description='test git fast-import utility'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
-. "$TEST_DIRECTORY"/diff-lib.sh ;# test-lib chdir's into trash
+. "$TEST_DIRECTORY"/lib-diff.sh ;# test-lib chdir's into trash
 
 verify_packs () {
 	for p in .git/objects/pack/*.pack
@@ -62,7 +65,7 @@ test_expect_success 'A: create pack from stdin' '
 	mark :4
 	data $file4_len
 	$file4_data
-	commit refs/heads/master
+	commit refs/heads/main
 	mark :5
 	committer $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> $GIT_COMMITTER_DATE
 	data <<COMMIT
@@ -117,7 +120,7 @@ test_expect_success 'A: create pack from stdin' '
 
 	INPUT_END
 	git fast-import --export-marks=marks.out <input &&
-	git whatchanged master
+	git whatchanged main
 '
 
 test_expect_success 'A: verify pack' '
@@ -131,7 +134,7 @@ test_expect_success 'A: verify commit' '
 
 	initial
 	EOF
-	git cat-file commit master | sed 1d >actual &&
+	git cat-file commit main | sed 1d >actual &&
 	test_cmp expect actual
 '
 
@@ -141,31 +144,31 @@ test_expect_success 'A: verify tree' '
 	100644 blob file3
 	100755 blob file4
 	EOF
-	git cat-file -p master^{tree} | sed "s/ [0-9a-f]*	/ /" >actual &&
+	git cat-file -p main^{tree} | sed "s/ [0-9a-f]*	/ /" >actual &&
 	test_cmp expect actual
 '
 
 test_expect_success 'A: verify file2' '
 	echo "$file2_data" >expect &&
-	git cat-file blob master:file2 >actual &&
+	git cat-file blob main:file2 >actual &&
 	test_cmp expect actual
 '
 
 test_expect_success 'A: verify file3' '
 	echo "$file3_data" >expect &&
-	git cat-file blob master:file3 >actual &&
+	git cat-file blob main:file3 >actual &&
 	test_cmp expect actual
 '
 
 test_expect_success 'A: verify file4' '
 	printf "$file4_data" >expect &&
-	git cat-file blob master:file4 >actual &&
+	git cat-file blob main:file4 >actual &&
 	test_cmp expect actual
 '
 
 test_expect_success 'A: verify tag/series-A' '
 	cat >expect <<-EOF &&
-	object $(git rev-parse refs/heads/master)
+	object $(git rev-parse refs/heads/main)
 	type commit
 	tag series-A
 
@@ -177,7 +180,7 @@ test_expect_success 'A: verify tag/series-A' '
 
 test_expect_success 'A: verify tag/series-A-blob' '
 	cat >expect <<-EOF &&
-	object $(git rev-parse refs/heads/master:file3)
+	object $(git rev-parse refs/heads/main:file3)
 	type blob
 	tag series-A-blob
 
@@ -193,13 +196,13 @@ test_expect_success 'A: verify tag deletion is successful' '
 
 test_expect_success 'A: verify marks output' '
 	cat >expect <<-EOF &&
-	:2 $(git rev-parse --verify master:file2)
-	:3 $(git rev-parse --verify master:file3)
-	:4 $(git rev-parse --verify master:file4)
-	:5 $(git rev-parse --verify master^0)
+	:2 $(git rev-parse --verify main:file2)
+	:3 $(git rev-parse --verify main:file3)
+	:4 $(git rev-parse --verify main:file4)
+	:5 $(git rev-parse --verify main^0)
 	:6 $(git cat-file tag nested | grep object | cut -d" " -f 2)
 	:7 $(git rev-parse --verify nested)
-	:8 $(git rev-parse --verify master^0)
+	:8 $(git rev-parse --verify main^0)
 	EOF
 	test_cmp expect marks.out
 '
@@ -217,7 +220,7 @@ test_expect_success 'A: tag blob by sha1' '
 	new_blob=$(echo testing | git hash-object --stdin) &&
 	cat >input <<-INPUT_END &&
 	tag series-A-blob-2
-	from $(git rev-parse refs/heads/master:file3)
+	from $(git rev-parse refs/heads/main:file3)
 	data <<EOF
 	Tag blob by sha1.
 	EOF
@@ -243,7 +246,7 @@ test_expect_success 'A: tag blob by sha1' '
 	INPUT_END
 
 	cat >expect <<-EOF &&
-	object $(git rev-parse refs/heads/master:file3)
+	object $(git rev-parse refs/heads/main:file3)
 	type blob
 	tag series-A-blob-2
 
@@ -284,13 +287,13 @@ test_expect_success 'A: verify pack' '
 '
 
 test_expect_success 'A: verify diff' '
-	copy=$(git rev-parse --verify master:file2) &&
+	copy=$(git rev-parse --verify main:file2) &&
 	cat >expect <<-EOF &&
 	:000000 100755 $ZERO_OID $copy A	copy-of-file2
 	EOF
-	git diff-tree -M -r master verify--import-marks >actual &&
+	git diff-tree -M -r main verify--import-marks >actual &&
 	compare_diff_raw expect actual &&
-	test $(git rev-parse --verify master:file2) \
+	test $(git rev-parse --verify main:file2) \
 	    = $(git rev-parse --verify verify--import-marks:copy-of-file2)
 '
 
@@ -364,7 +367,7 @@ test_expect_success 'B: fail on invalid blob sha1' '
 	corrupt
 	COMMIT
 
-	from refs/heads/master
+	from refs/heads/main
 	M 755 $(echo $ZERO_OID | sed -e "s/0$/1/") zero1
 
 	INPUT_END
@@ -381,16 +384,14 @@ test_expect_success 'B: accept branch name "TEMP_TAG"' '
 	tag base
 	COMMIT
 
-	from refs/heads/master
+	from refs/heads/main
 
 	INPUT_END
 
-	test_when_finished "rm -f .git/TEMP_TAG
-		git gc
-		git prune" &&
+	test_when_finished "rm -f .git/TEMP_TAG && git gc --prune=now" &&
 	git fast-import <input &&
-	test -f .git/TEMP_TAG &&
-	test $(git rev-parse master) = $(git rev-parse TEMP_TAG^)
+	test $(test-tool ref-store main resolve-ref TEMP_TAG 0 | cut -f1 -d " " ) != "$ZERO_OID" &&
+	test $(git rev-parse main) = $(git rev-parse TEMP_TAG^)
 '
 
 test_expect_success 'B: accept empty committer' '
@@ -403,8 +404,7 @@ test_expect_success 'B: accept empty committer' '
 	INPUT_END
 
 	test_when_finished "git update-ref -d refs/heads/empty-committer-1
-		git gc
-		git prune" &&
+		git gc --prune=now" &&
 	git fast-import <input &&
 	out=$(git fsck) &&
 	echo "$out" &&
@@ -449,8 +449,7 @@ test_expect_success 'B: accept and fixup committer with no name' '
 	INPUT_END
 
 	test_when_finished "git update-ref -d refs/heads/empty-committer-2
-		git gc
-		git prune" &&
+		git gc --prune=now" &&
 	git fast-import <input &&
 	out=$(git fsck) &&
 	echo "$out" &&
@@ -528,8 +527,8 @@ test_expect_success 'B: fail on invalid committer (5)' '
 
 test_expect_success 'C: incremental import create pack from stdin' '
 	newf=$(echo hi newf | git hash-object -w --stdin) &&
-	oldf=$(git rev-parse --verify master:file2) &&
-	thrf=$(git rev-parse --verify master:file3) &&
+	oldf=$(git rev-parse --verify main:file2) &&
+	thrf=$(git rev-parse --verify main:file3) &&
 	test_tick &&
 	cat >input <<-INPUT_END &&
 	commit refs/heads/branch
@@ -538,7 +537,7 @@ test_expect_success 'C: incremental import create pack from stdin' '
 	second
 	COMMIT
 
-	from refs/heads/master
+	from refs/heads/main
 	M 644 $oldf file2/oldf
 	M 755 $newf file2/newf
 	D file3
@@ -560,7 +559,7 @@ test_expect_success 'C: validate reuse existing blob' '
 
 test_expect_success 'C: verify commit' '
 	cat >expect <<-EOF &&
-	parent $(git rev-parse --verify master^0)
+	parent $(git rev-parse --verify main^0)
 	author $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> $GIT_COMMITTER_DATE
 	committer $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> $GIT_COMMITTER_DATE
 
@@ -578,7 +577,7 @@ test_expect_success 'C: validate rename result' '
 	:100644 100644 $oldf $oldf R100	file2	file2/oldf
 	:100644 000000 $thrf $zero D	file3
 	EOF
-	git diff-tree -M -r master branch >actual &&
+	git diff-tree -M -r main branch >actual &&
 	compare_diff_raw expect actual
 '
 
@@ -987,7 +986,7 @@ test_expect_success 'L: nested tree copy does not corrupt deltas' '
 	test_when_finished "git update-ref -d refs/heads/L2" &&
 	git fast-import <input &&
 	git ls-tree L2 g/b/ >tmp &&
-	cat tmp | cut -f 2 >actual &&
+	cut -f 2 <tmp >actual &&
 	test_cmp expect actual &&
 	git fsck $(git rev-parse L2)
 '
@@ -1535,7 +1534,6 @@ test_expect_success 'O: comments are all skipped' '
 	commit refs/heads/O1
 	# -- ignore all of this text
 	committer $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> $GIT_COMMITTER_DATE
-	# $GIT_COMMITTER_NAME has inserted here for his benefit.
 	data <<COMMIT
 	dirty directory copy
 	COMMIT
@@ -1629,7 +1627,10 @@ test_expect_success 'O: blank lines not necessary after other commands' '
 	INPUT_END
 
 	git fast-import <input &&
-	test 8 = $(find .git/objects/pack -type f | grep -v multi-pack-index | wc -l) &&
+	ls -la .git/objects/pack/pack-*.pack >packlist &&
+	ls -la .git/objects/pack/pack-*.pack >idxlist &&
+	test_line_count = 4 idxlist &&
+	test_line_count = 4 packlist &&
 	test $(git rev-parse refs/tags/O3-2nd) = $(git rev-parse O3^) &&
 	git log --reverse --pretty=oneline O3 | sed s/^.*z// >actual &&
 	test_cmp expect actual
@@ -1698,7 +1699,7 @@ test_expect_success 'P: superproject & submodule mix' '
 	committer $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> $GIT_COMMITTER_DATE
 	data 8
 	initial
-	from refs/heads/master
+	from refs/heads/main
 	M 100644 :3 .gitmodules
 	M 160000 :2 sub
 
@@ -1733,8 +1734,8 @@ test_expect_success 'P: superproject & submodule mix' '
 	(
 		cd sub &&
 		git init &&
-		git fetch --update-head-ok .. refs/heads/sub:refs/heads/master &&
-		git checkout master
+		git fetch --update-head-ok .. refs/heads/sub:refs/heads/main &&
+		git checkout main
 	) &&
 	git submodule init &&
 	git submodule update
@@ -1758,7 +1759,7 @@ test_expect_success 'P: verbatim SHA gitlinks' '
 	committer $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> $GIT_COMMITTER_DATE
 	data 8
 	initial
-	from refs/heads/master
+	from refs/heads/main
 	M 100644 :1 .gitmodules
 	M 160000 $SUBPREV sub
 
@@ -1773,8 +1774,7 @@ test_expect_success 'P: verbatim SHA gitlinks' '
 	INPUT_END
 
 	git branch -D sub &&
-	git gc &&
-	git prune &&
+	git gc --prune=now &&
 	git fast-import <input &&
 	test $(git rev-parse --verify subuse2) = $(git rev-parse --verify subuse1)
 '
@@ -2007,12 +2007,11 @@ test_expect_success 'Q: verify first notes commit' '
 '
 
 test_expect_success 'Q: verify first notes tree' '
-	cat >expect.unsorted <<-EOF &&
+	sort >expect <<-EOF &&
 	100644 blob $commit1
 	100644 blob $commit2
 	100644 blob $commit3
 	EOF
-	cat expect.unsorted | sort >expect &&
 	git cat-file -p refs/notes/foobar~2^{tree} | sed "s/ [0-9a-f]*	/ /" >actual &&
 	test_cmp expect actual
 '
@@ -2048,12 +2047,11 @@ test_expect_success 'Q: verify second notes commit' '
 '
 
 test_expect_success 'Q: verify second notes tree' '
-	cat >expect.unsorted <<-EOF &&
+	sort >expect <<-EOF &&
 	100644 blob $commit1
 	100644 blob $commit2
 	100644 blob $commit3
 	EOF
-	cat expect.unsorted | sort >expect &&
 	git cat-file -p refs/notes/foobar^^{tree} | sed "s/ [0-9a-f]*	/ /" >actual &&
 	test_cmp expect actual
 '
@@ -2088,10 +2086,9 @@ test_expect_success 'Q: verify third notes commit' '
 '
 
 test_expect_success 'Q: verify third notes tree' '
-	cat >expect.unsorted <<-EOF &&
+	sort >expect <<-EOF &&
 	100644 blob $commit1
 	EOF
-	cat expect.unsorted | sort >expect &&
 	git cat-file -p refs/notes/foobar2^{tree} | sed "s/ [0-9a-f]*	/ /" >actual &&
 	test_cmp expect actual
 '
@@ -2115,10 +2112,9 @@ test_expect_success 'Q: verify fourth notes commit' '
 '
 
 test_expect_success 'Q: verify fourth notes tree' '
-	cat >expect.unsorted <<-EOF &&
+	sort >expect <<-EOF &&
 	100644 blob $commit2
 	EOF
-	cat expect.unsorted | sort >expect &&
 	git cat-file -p refs/notes/foobar^{tree} | sed "s/ [0-9a-f]*	/ /" >actual &&
 	test_cmp expect actual
 '
@@ -2879,7 +2875,7 @@ test_expect_success 'S: filemodify with garbage after mark must fail' '
 	COMMIT
 	M 100644 :403x hello.c
 	EOF
-	test_i18ngrep "space after mark" err
+	test_grep "space after mark" err
 '
 
 # inline is misspelled; fast-import thinks it is some unknown dataref
@@ -2895,7 +2891,7 @@ test_expect_success 'S: filemodify with garbage after inline must fail' '
 	inline
 	BLOB
 	EOF
-	test_i18ngrep "nvalid dataref" err
+	test_grep "nvalid dataref" err
 '
 
 test_expect_success 'S: filemodify with garbage after sha1 must fail' '
@@ -2908,7 +2904,7 @@ test_expect_success 'S: filemodify with garbage after sha1 must fail' '
 	COMMIT
 	M 100644 ${sha1}x hello.c
 	EOF
-	test_i18ngrep "space after SHA1" err
+	test_grep "space after SHA1" err
 '
 
 #
@@ -2923,7 +2919,7 @@ test_expect_success 'S: notemodify with garbage after mark dataref must fail' '
 	COMMIT
 	N :202x :302
 	EOF
-	test_i18ngrep "space after mark" err
+	test_grep "space after mark" err
 '
 
 test_expect_success 'S: notemodify with garbage after inline dataref must fail' '
@@ -2938,7 +2934,7 @@ test_expect_success 'S: notemodify with garbage after inline dataref must fail'
 	note blob
 	BLOB
 	EOF
-	test_i18ngrep "nvalid dataref" err
+	test_grep "nvalid dataref" err
 '
 
 test_expect_success 'S: notemodify with garbage after sha1 dataref must fail' '
@@ -2951,7 +2947,7 @@ test_expect_success 'S: notemodify with garbage after sha1 dataref must fail' '
 	COMMIT
 	N ${sha1}x :302
 	EOF
-	test_i18ngrep "space after SHA1" err
+	test_grep "space after SHA1" err
 '
 
 #
@@ -2966,7 +2962,7 @@ test_expect_success 'S: notemodify with garbage after mark commit-ish must fail'
 	COMMIT
 	N :202 :302x
 	EOF
-	test_i18ngrep "after mark" err
+	test_grep "after mark" err
 '
 
 #
@@ -2999,7 +2995,7 @@ test_expect_success 'S: from with garbage after mark must fail' '
 	EOF
 
 	# now evaluate the error
-	test_i18ngrep "after mark" err
+	test_grep "after mark" err
 '
 
 
@@ -3018,7 +3014,7 @@ test_expect_success 'S: merge with garbage after mark must fail' '
 	merge :303x
 	M 100644 :403 hello.c
 	EOF
-	test_i18ngrep "after mark" err
+	test_grep "after mark" err
 '
 
 #
@@ -3033,7 +3029,7 @@ test_expect_success 'S: tag with garbage after mark must fail' '
 	tag S
 	TAG
 	EOF
-	test_i18ngrep "after mark" err
+	test_grep "after mark" err
 '
 
 #
@@ -3043,7 +3039,7 @@ test_expect_success 'S: cat-blob with garbage after mark must fail' '
 	test_must_fail git fast-import --import-marks=marks <<-EOF 2>err &&
 	cat-blob :403x
 	EOF
-	test_i18ngrep "after mark" err
+	test_grep "after mark" err
 '
 
 #
@@ -3053,7 +3049,7 @@ test_expect_success 'S: ls with garbage after mark must fail' '
 	test_must_fail git fast-import --import-marks=marks <<-EOF 2>err &&
 	ls :302x hello.c
 	EOF
-	test_i18ngrep "space after mark" err
+	test_grep "space after mark" err
 '
 
 test_expect_success 'S: ls with garbage after sha1 must fail' '
@@ -3061,7 +3057,7 @@ test_expect_success 'S: ls with garbage after sha1 must fail' '
 	test_must_fail git fast-import --import-marks=marks <<-EOF 2>err &&
 	ls ${sha1}x hello.c
 	EOF
-	test_i18ngrep "space after tree-ish" err
+	test_grep "space after tree-ish" err
 '
 
 ###
@@ -3429,8 +3425,8 @@ mark :1
 data 4
 foo
 
-reset refs/heads/master
-commit refs/heads/master
+reset refs/heads/main
+commit refs/heads/main
 mark :2
 author Full Name <user@company.tld> 1000000000 +0100
 committer Full Name <user@company.tld> 1000000000 +0100
@@ -3444,7 +3440,7 @@ data 8
 foo
 bar
 
-commit refs/heads/master
+commit refs/heads/main
 mark :4
 author Full Name <user@company.tld> 1000000001 +0100
 committer Full Name <user@company.tld> 1000000001 +0100
@@ -3461,8 +3457,8 @@ mark :1
 data 4
 foo
 
-reset refs/heads/master
-commit refs/heads/master
+reset refs/heads/main
+commit refs/heads/main
 mark :2
 author Full Name <user@company.tld> 2000000000 +0100
 committer Full Name <user@company.tld> 2000000000 +0100
@@ -3477,7 +3473,7 @@ data 73
 	path = sub1
 	url = https://void.example.com/main.git
 
-commit refs/heads/master
+commit refs/heads/main
 mark :4
 author Full Name <user@company.tld> 2000000001 +0100
 committer Full Name <user@company.tld> 2000000001 +0100
@@ -3493,7 +3489,7 @@ data 8
 foo
 bar
 
-commit refs/heads/master
+commit refs/heads/main
 mark :6
 author Full Name <user@company.tld> 2000000002 +0100
 committer Full Name <user@company.tld> 2000000002 +0100
@@ -3511,8 +3507,8 @@ Y_INPUT_END
 
 test_expect_success 'Y: setup' '
 	test_oid_cache <<-EOF
-	Ymaster sha1:9afed2f9161ddf416c0a1863b8b0725b00070504
-	Ymaster sha256:c0a1010da1df187b2e287654793df01b464bd6f8e3f17fc1481a7dadf84caee3
+	Ymain sha1:9afed2f9161ddf416c0a1863b8b0725b00070504
+	Ymain sha256:c0a1010da1df187b2e287654793df01b464bd6f8e3f17fc1481a7dadf84caee3
 	EOF
 '
 
@@ -3524,7 +3520,7 @@ test_expect_success 'Y: rewrite submodules' '
 		git -C sub2 fast-import --export-marks=../sub2-marks <../Y-sub-input &&
 		git fast-import --rewrite-submodules-from=sub:../Y-marks \
 			--rewrite-submodules-to=sub:sub2-marks <../Y-main-input &&
-		test "$(git rev-parse master)" = "$(test_oid Ymaster)"
+		test "$(git rev-parse main)" = "$(test_oid Ymain)"
 	)
 '
 
diff --git a/t/t9301-fast-import-notes.sh b/t/t9301-fast-import-notes.sh
index 14c1baa..5841322 100755
--- a/t/t9301-fast-import-notes.sh
+++ b/t/t9301-fast-import-notes.sh
@@ -4,12 +4,16 @@
 #
 
 test_description='test git fast-import of notes objects'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 
 test_tick
 cat >input <<INPUT_END
-commit refs/heads/master
+commit refs/heads/main
 committer $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> $GIT_COMMITTER_DATE
 data <<COMMIT
 first commit
@@ -30,7 +34,7 @@ data <<EOF
 file baz/xyzzy in first commit
 EOF
 
-commit refs/heads/master
+commit refs/heads/main
 committer $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> $GIT_COMMITTER_DATE
 data <<COMMIT
 second commit
@@ -46,7 +50,7 @@ data <<EOF
 file baz/xyzzy in second commit
 EOF
 
-commit refs/heads/master
+commit refs/heads/main
 committer $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> $GIT_COMMITTER_DATE
 data <<COMMIT
 third commit
@@ -57,7 +61,7 @@ data <<EOF
 file foo in third commit
 EOF
 
-commit refs/heads/master
+commit refs/heads/main
 committer $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> $GIT_COMMITTER_DATE
 data <<COMMIT
 fourth commit
@@ -70,13 +74,13 @@ EOF
 
 INPUT_END
 
-test_expect_success 'set up master branch' '
+test_expect_success 'set up main branch' '
 
 	git fast-import <input &&
-	git whatchanged master
+	git whatchanged main
 '
 
-commit4=$(git rev-parse refs/heads/master)
+commit4=$(git rev-parse refs/heads/main)
 commit3=$(git rev-parse "$commit4^")
 commit2=$(git rev-parse "$commit4~2")
 commit1=$(git rev-parse "$commit4~3")
diff --git a/t/t9302-fast-import-unpack-limit.sh b/t/t9302-fast-import-unpack-limit.sh
index bb1c39c..d8b1f94 100755
--- a/t/t9302-fast-import-unpack-limit.sh
+++ b/t/t9302-fast-import-unpack-limit.sh
@@ -1,11 +1,13 @@
 #!/bin/sh
 test_description='test git fast-import unpack limit'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'create loose objects on import' '
 	test_tick &&
 	cat >input <<-INPUT_END &&
-	commit refs/heads/master
+	commit refs/heads/main
 	committer $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> $GIT_COMMITTER_DATE
 	data <<COMMIT
 	initial
@@ -23,12 +25,12 @@ test_expect_success 'create loose objects on import' '
 test_expect_success 'bigger packs are preserved' '
 	test_tick &&
 	cat >input <<-INPUT_END &&
-	commit refs/heads/master
+	commit refs/heads/main
 	committer $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> $GIT_COMMITTER_DATE
 	data <<COMMIT
 	incremental should create a pack
 	COMMIT
-	from refs/heads/master^0
+	from refs/heads/main^0
 
 	commit refs/heads/branch
 	committer $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> $GIT_COMMITTER_DATE
@@ -48,7 +50,7 @@ test_expect_success 'bigger packs are preserved' '
 test_expect_success 'lookups after checkpoint works' '
 	hello_id=$(echo hello | git hash-object --stdin -t blob) &&
 	id="$GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> $GIT_COMMITTER_DATE" &&
-	before=$(git rev-parse refs/heads/master^0) &&
+	before=$(git rev-parse refs/heads/main^0) &&
 	(
 		cat <<-INPUT_END &&
 		blob
@@ -56,13 +58,13 @@ test_expect_success 'lookups after checkpoint works' '
 		data 6
 		hello
 
-		commit refs/heads/master
+		commit refs/heads/main
 		mark :2
 		committer $id
 		data <<COMMIT
 		checkpoint after this
 		COMMIT
-		from refs/heads/master^0
+		from refs/heads/main^0
 		M 100644 :1 hello
 
 		# pre-checkpoint
@@ -86,10 +88,10 @@ test_expect_success 'lookups after checkpoint works' '
 				n=$(($n + 1))
 			fi &&
 			sleep 1 &&
-			from=$(git rev-parse refs/heads/master^0)
+			from=$(git rev-parse refs/heads/main^0)
 		done &&
 		cat <<-INPUT_END &&
-		commit refs/heads/master
+		commit refs/heads/main
 		committer $id
 		data <<COMMIT
 		make sure from "unpacked sha1 reference" works, too
diff --git a/t/t9303-fast-import-compression.sh b/t/t9303-fast-import-compression.sh
index 5045f02..4f5bf40 100755
--- a/t/t9303-fast-import-compression.sh
+++ b/t/t9303-fast-import-compression.sh
@@ -1,13 +1,9 @@
 #!/bin/sh
 
 test_description='compression setting of fast-import utility'
-. ./test-lib.sh
 
-# This should be moved to test-lib.sh together with the
-# copy in t0021 after both topics have graduated to 'master'.
-file_size () {
-	test-tool path-utils file-size "$1"
-}
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
 
 import_large () {
 	(
@@ -24,7 +20,7 @@ do
 		test_when_finished "rm -f .git/objects/pack/pack-*.*" &&
 		test_when_finished "rm -rf .git/objects/??" &&
 		import_large -c fastimport.unpacklimit=0 $config &&
-		sz=$(file_size .git/objects/pack/pack-*.pack) &&
+		sz=$(test_file_size .git/objects/pack/pack-*.pack) &&
 		case "$expect" in
 		small) test "$sz" -le 100000 ;;
 		large) test "$sz" -ge 100000 ;;
@@ -47,7 +43,7 @@ do
 		test_when_finished "rm -f .git/objects/pack/pack-*.*" &&
 		test_when_finished "rm -rf .git/objects/??" &&
 		import_large -c fastimport.unpacklimit=9 $config &&
-		sz=$(file_size .git/objects/??/????*) &&
+		sz=$(test_file_size .git/objects/??/????*) &&
 		case "$expect" in
 		small) test "$sz" -le 100000 ;;
 		large) test "$sz" -ge 100000 ;;
diff --git a/t/t9304-fast-import-marks.sh b/t/t9304-fast-import-marks.sh
new file mode 100755
index 0000000..410a871
--- /dev/null
+++ b/t/t9304-fast-import-marks.sh
@@ -0,0 +1,81 @@
+#!/bin/sh
+
+test_description='test exotic situations with marks'
+. ./test-lib.sh
+
+test_expect_success 'setup dump of basic history' '
+	test_commit one &&
+	git fast-export --export-marks=marks HEAD >dump
+'
+
+test_expect_success 'setup large marks file' '
+	# normally a marks file would have a lot of useful, unique
+	# marks. But for our purposes, just having a lot of nonsense
+	# ones is fine. Start at 1024 to avoid clashing with marks
+	# legitimately used in our tiny dump.
+	blob=$(git rev-parse HEAD:one.t) &&
+	for i in $(test_seq 1024 16384)
+	do
+		echo ":$i $blob" || return 1
+	done >>marks
+'
+
+test_expect_success 'import with large marks file' '
+	git fast-import --import-marks=marks <dump
+'
+
+test_expect_success 'setup dump with submodule' '
+	test_config_global protocol.file.allow always &&
+	git submodule add "$PWD" sub &&
+	git commit -m "add submodule" &&
+	git fast-export HEAD >dump
+'
+
+test_expect_success 'setup submodule mapping with large id' '
+	old=$(git rev-parse HEAD:sub) &&
+	new=$(echo $old | sed s/./a/g) &&
+	echo ":12345 $old" >from &&
+	echo ":12345 $new" >to
+'
+
+test_expect_success 'import with submodule mapping' '
+	git init dst &&
+	git -C dst fast-import \
+		--rewrite-submodules-from=sub:../from \
+		--rewrite-submodules-to=sub:../to \
+		<dump &&
+	git -C dst rev-parse HEAD:sub >actual &&
+	echo "$new" >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'paths adjusted for relative subdir' '
+	git init deep-dst &&
+	mkdir deep-dst/subdir &&
+	>deep-dst/subdir/empty-marks &&
+	git -C deep-dst/subdir fast-import \
+		--rewrite-submodules-from=sub:../../from \
+		--rewrite-submodules-to=sub:../../to \
+		--import-marks=empty-marks \
+		--export-marks=exported-marks \
+		--export-pack-edges=exported-edges \
+		<dump &&
+	# we do not bother checking resulting repo; we just care that nothing
+	# complained about failing to open files for reading, and that files
+	# for writing were created in the expected spot
+	test_path_is_file deep-dst/subdir/exported-marks &&
+	test_path_is_file deep-dst/subdir/exported-edges
+'
+
+test_expect_success 'relative marks are not affected by subdir' '
+	git init deep-relative &&
+	mkdir deep-relative/subdir &&
+	git -C deep-relative/subdir fast-import \
+		--relative-marks \
+		--export-marks=exported-marks \
+		<dump &&
+	test_path_is_missing deep-relative/subdir/exported-marks &&
+	test_path_is_file deep-relative/.git/info/fast-import/exported-marks
+'
+
+test_done
diff --git a/t/t9350-fast-export.sh b/t/t9350-fast-export.sh
index 1372842..1eb035e 100755
--- a/t/t9350-fast-export.sh
+++ b/t/t9350-fast-export.sh
@@ -4,6 +4,9 @@
 #
 
 test_description='git fast-export'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 test_expect_success 'setup' '
@@ -31,13 +34,13 @@ test_expect_success 'setup' '
 	git commit -m sitzt file2 &&
 	test_tick &&
 	git tag -a -m valentin muss &&
-	git merge -s ours master
+	git merge -s ours main
 
 '
 
 test_expect_success 'fast-export | fast-import' '
 
-	MASTER=$(git rev-parse --verify master) &&
+	MAIN=$(git rev-parse --verify main) &&
 	REIN=$(git rev-parse --verify rein) &&
 	WER=$(git rev-parse --verify wer) &&
 	MUSS=$(git rev-parse --verify muss) &&
@@ -46,7 +49,7 @@ test_expect_success 'fast-export | fast-import' '
 	git fast-export --all >actual &&
 	(cd new &&
 	 git fast-import &&
-	 test $MASTER = $(git rev-parse --verify refs/heads/master) &&
+	 test $MAIN = $(git rev-parse --verify refs/heads/main) &&
 	 test $REIN = $(git rev-parse --verify refs/tags/rein) &&
 	 test $WER = $(git rev-parse --verify refs/heads/wer) &&
 	 test $MUSS = $(git rev-parse --verify refs/tags/muss)) <actual
@@ -80,35 +83,35 @@ test_expect_success 'fast-export --mark-tags ^muss^{commit} muss' '
 	test_cmp expected actual
 '
 
-test_expect_success 'fast-export master~2..master' '
+test_expect_success 'fast-export main~2..main' '
 
-	git fast-export master~2..master >actual &&
-	sed "s/master/partial/" actual |
+	git fast-export main~2..main >actual &&
+	sed "s/main/partial/" actual |
 		(cd new &&
 		 git fast-import &&
-		 test $MASTER != $(git rev-parse --verify refs/heads/partial) &&
-		 git diff --exit-code master partial &&
-		 git diff --exit-code master^ partial^ &&
+		 test $MAIN != $(git rev-parse --verify refs/heads/partial) &&
+		 git diff --exit-code main partial &&
+		 git diff --exit-code main^ partial^ &&
 		 test_must_fail git rev-parse partial~2)
 
 '
 
-test_expect_success 'fast-export --reference-excluded-parents master~2..master' '
+test_expect_success 'fast-export --reference-excluded-parents main~2..main' '
 
-	git fast-export --reference-excluded-parents master~2..master >actual &&
-	grep commit.refs/heads/master actual >commit-count &&
+	git fast-export --reference-excluded-parents main~2..main >actual &&
+	grep commit.refs/heads/main actual >commit-count &&
 	test_line_count = 2 commit-count &&
-	sed "s/master/rewrite/" actual |
+	sed "s/main/rewrite/" actual |
 		(cd new &&
 		 git fast-import &&
-		 test $MASTER = $(git rev-parse --verify refs/heads/rewrite))
+		 test $MAIN = $(git rev-parse --verify refs/heads/rewrite))
 '
 
 test_expect_success 'fast-export --show-original-ids' '
 
-	git fast-export --show-original-ids master >output &&
+	git fast-export --show-original-ids main >output &&
 	grep ^original-oid output| sed -e s/^original-oid.// | sort >actual &&
-	git rev-list --objects master muss >objects-and-names &&
+	git rev-list --objects main muss >objects-and-names &&
 	awk "{print \$1}" objects-and-names | sort >commits-trees-blobs &&
 	comm -23 actual commits-trees-blobs >unfound &&
 	test_must_be_empty unfound
@@ -116,8 +119,8 @@ test_expect_success 'fast-export --show-original-ids' '
 
 test_expect_success 'fast-export --show-original-ids | git fast-import' '
 
-	git fast-export --show-original-ids master muss | git fast-import --quiet &&
-	test $MASTER = $(git rev-parse --verify refs/heads/master) &&
+	git fast-export --show-original-ids main muss | git fast-import --quiet &&
+	test $MAIN = $(git rev-parse --verify refs/heads/main) &&
 	test $MUSS = $(git rev-parse --verify refs/tags/muss)
 '
 
@@ -200,7 +203,7 @@ test_expect_success 'encoding preserved if reencoding fails' '
 
 test_expect_success 'import/export-marks' '
 
-	git checkout -b marks master &&
+	git checkout -b marks main &&
 	git fast-export --export-marks=tmp-marks HEAD &&
 	test -s tmp-marks &&
 	test_line_count = 3 tmp-marks &&
@@ -233,7 +236,7 @@ EOF
 
 test_expect_success 'set up faked signed tag' '
 
-	cat signed-tag-import | git fast-import
+	git fast-import <signed-tag-import
 
 '
 
@@ -265,7 +268,8 @@ test_expect_success 'signed-tags=warn-strip' '
 
 test_expect_success 'setup submodule' '
 
-	git checkout -f master &&
+	test_config_global protocol.file.allow always &&
+	git checkout -f main &&
 	mkdir sub &&
 	(
 		cd sub &&
@@ -290,17 +294,18 @@ test_expect_success 'setup submodule' '
 
 test_expect_success 'submodule fast-export | fast-import' '
 
-	SUBENT1=$(git ls-tree master^ sub) &&
-	SUBENT2=$(git ls-tree master sub) &&
+	test_config_global protocol.file.allow always &&
+	SUBENT1=$(git ls-tree main^ sub) &&
+	SUBENT2=$(git ls-tree main sub) &&
 	rm -rf new &&
 	mkdir new &&
 	git --git-dir=new/.git init &&
 	git fast-export --signed-tags=strip --all >actual &&
 	(cd new &&
 	 git fast-import &&
-	 test "$SUBENT1" = "$(git ls-tree refs/heads/master^ sub)" &&
-	 test "$SUBENT2" = "$(git ls-tree refs/heads/master sub)" &&
-	 git checkout master &&
+	 test "$SUBENT1" = "$(git ls-tree refs/heads/main^ sub)" &&
+	 test "$SUBENT2" = "$(git ls-tree refs/heads/main sub)" &&
+	 git checkout main &&
 	 git submodule init &&
 	 git submodule update &&
 	 cmp sub/file ../sub/file) <actual
@@ -352,7 +357,7 @@ test_expect_success 'fast-export -C -C | fast-import' '
 
 '
 
-test_expect_success 'fast-export | fast-import when master is tagged' '
+test_expect_success 'fast-export | fast-import when main is tagged' '
 
 	git tag -m msg last &&
 	git fast-export -C -C --signed-tags=strip --all > output &&
@@ -368,7 +373,7 @@ EOF
 
 test_expect_success 'cope with tagger-less tags' '
 
-	TAG=$(git hash-object -t tag -w tag-content) &&
+	TAG=$(git hash-object --literally -t tag -w tag-content) &&
 	git update-ref refs/tags/sonnenschein $TAG &&
 	git fast-export -C -C --signed-tags=strip --all > output &&
 	test $(grep -c "^tag " output) = 4 &&
@@ -467,8 +472,8 @@ mark :2
 data 3
 hi
 
-reset refs/heads/master
-commit refs/heads/master
+reset refs/heads/main
+commit refs/heads/main
 mark :3
 author A U Thor <author@example.com> 1112912713 -0700
 committer C O Mitter <committer@example.com> 1112912713 -0700
@@ -482,7 +487,7 @@ EOF
 test_expect_failure 'no exact-ref revisions included' '
 	(
 		cd limit-by-paths &&
-		git fast-export master~2..master~1 > output &&
+		git fast-export main~2..main~1 > output &&
 		test_cmp expected output
 	)
 '
@@ -497,6 +502,13 @@ test_expect_success 'path limiting with import-marks does not lose unmodified fi
 	grep file0 actual
 '
 
+test_expect_success 'path limiting works' '
+	git fast-export simple -- file >actual &&
+	sed -ne "s/^M .* //p" <actual | sort -u >actual.files &&
+	echo file >expect &&
+	test_cmp expect actual.files
+'
+
 test_expect_success 'avoid corrupt stream with non-existent mark' '
 	test_create_repo avoid_non_existent_mark &&
 	(
@@ -524,8 +536,8 @@ test_expect_success 'full-tree re-shows unmodified files'        '
 '
 
 test_expect_success 'set-up a few more tags for tag export tests' '
-	git checkout -f master &&
-	HEAD_TREE=$(git show -s --pretty=raw HEAD | grep tree | sed "s/tree //") &&
+	git checkout -f main &&
+	HEAD_TREE=$(git show -s --pretty=raw HEAD | sed -n "/tree/s/tree //p") &&
 	git tag    tree_tag        -m "tagging a tree" $HEAD_TREE &&
 	git tag -a tree_tag-obj    -m "tagging a tree" $HEAD_TREE &&
 	git tag    tag-obj_tag     -m "tagging a tag" tree_tag-obj &&
@@ -549,7 +561,7 @@ test_expect_success 'tag-obj_tag'     'git fast-export tag-obj_tag'
 test_expect_success 'tag-obj_tag-obj' 'git fast-export tag-obj_tag-obj'
 
 test_expect_success 'handling tags of blobs' '
-	git tag -a -m "Tag of a blob" blobtag $(git rev-parse master:file) &&
+	git tag -a -m "Tag of a blob" blobtag $(git rev-parse main:file) &&
 	git fast-export blobtag >actual &&
 	cat >expect <<-EOF &&
 	blob
@@ -592,10 +604,10 @@ test_expect_success 'directory becomes symlink'        '
 	) &&
 	(
 		cd dirtosymlink &&
-		git fast-export master -- foo |
+		git fast-export main -- foo |
 		(cd ../result && git fast-import --quiet)
 	) &&
-	(cd result && git show master:foo)
+	(cd result && git show main:foo)
 '
 
 test_expect_success 'fast-export quotes pathnames' '
@@ -643,7 +655,7 @@ mark :13
 data 5
 bump
 
-commit refs/heads/master
+commit refs/heads/main
 mark :14
 author A U Thor <author@example.com> 1112912773 -0700
 committer C O Mitter <committer@example.com> 1112912773 -0700
@@ -657,18 +669,18 @@ EOF
 test_expect_success 'avoid uninteresting refs' '
 	> tmp-marks &&
 	git fast-export --import-marks=tmp-marks \
-		--export-marks=tmp-marks master > /dev/null &&
+		--export-marks=tmp-marks main > /dev/null &&
 	git tag v1.0 &&
 	git branch uninteresting &&
 	echo bump > file &&
 	git commit -a -m bump &&
 	git fast-export --import-marks=tmp-marks \
-		--export-marks=tmp-marks ^uninteresting ^v1.0 master > actual &&
+		--export-marks=tmp-marks ^uninteresting ^v1.0 main > actual &&
 	test_cmp expected actual
 '
 
 cat > expected << EOF
-reset refs/heads/master
+reset refs/heads/main
 from :14
 
 EOF
@@ -676,14 +688,14 @@ EOF
 test_expect_success 'refs are updated even if no commits need to be exported' '
 	> tmp-marks &&
 	git fast-export --import-marks=tmp-marks \
-		--export-marks=tmp-marks master > /dev/null &&
+		--export-marks=tmp-marks main > /dev/null &&
 	git fast-export --import-marks=tmp-marks \
-		--export-marks=tmp-marks master > actual &&
+		--export-marks=tmp-marks main > actual &&
 	test_cmp expected actual
 '
 
 test_expect_success 'use refspec' '
-	git fast-export --refspec refs/heads/master:refs/heads/foobar master >actual2 &&
+	git fast-export --refspec refs/heads/main:refs/heads/foobar main >actual2 &&
 	grep "^commit " actual2 | sort | uniq >actual &&
 	echo "commit refs/heads/foobar" > expected &&
 	test_cmp expected actual
@@ -736,15 +748,57 @@ test_expect_success 'merge commit gets exported with --import-marks' '
 		test_commit initial &&
 		git checkout -b topic &&
 		test_commit on-topic &&
-		git checkout master &&
-		test_commit on-master &&
+		git checkout main &&
+		test_commit on-main &&
 		test_tick &&
 		git merge --no-ff -m Yeah topic &&
 
 		echo ":1 $(git rev-parse HEAD^^)" >marks &&
-		git fast-export --import-marks=marks master >out &&
+		git fast-export --import-marks=marks main >out &&
 		grep Yeah out
 	)
 '
 
+
+test_expect_success 'fast-export --first-parent outputs all revisions output by revision walk' '
+	git init first-parent &&
+	(
+		cd first-parent &&
+		test_commit A &&
+		git checkout -b topic1 &&
+		test_commit B &&
+		git checkout main &&
+		git merge --no-ff topic1 &&
+
+		git checkout -b topic2 &&
+		test_commit C &&
+		git checkout main &&
+		git merge --no-ff topic2 &&
+
+		test_commit D &&
+
+		git fast-export main -- --first-parent >first-parent-export &&
+		git fast-export main -- --first-parent --reverse >first-parent-reverse-export &&
+		test_cmp first-parent-export first-parent-reverse-export &&
+
+		git init import &&
+		git -C import fast-import <first-parent-export &&
+
+		git log --format="%ad %s" --first-parent main >expected &&
+		git -C import log --format="%ad %s" --all >actual &&
+		test_cmp expected actual &&
+		test_line_count = 4 actual
+	)
+'
+
+test_expect_success 'fast-export handles --end-of-options' '
+	git update-ref refs/heads/nodash HEAD &&
+	git update-ref refs/heads/--dashes HEAD &&
+	git fast-export --end-of-options nodash >expect &&
+	git fast-export --end-of-options --dashes >actual.raw &&
+	# fix up lines which mention the ref for comparison
+	sed s/--dashes/nodash/ <actual.raw >actual &&
+	test_cmp expect actual
+'
+
 test_done
diff --git a/t/t9351-fast-export-anonymize.sh b/t/t9351-fast-export-anonymize.sh
index 5ac2c3b..156a647 100755
--- a/t/t9351-fast-export-anonymize.sh
+++ b/t/t9351-fast-export-anonymize.sh
@@ -1,6 +1,9 @@
 #!/bin/sh
 
 test_description='basic tests for fast-export --anonymize'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 test_expect_success 'setup simple repo' '
@@ -15,12 +18,14 @@ test_expect_success 'setup simple repo' '
 	git update-index --add --cacheinfo 160000,$fake_commit,link1 &&
 	git update-index --add --cacheinfo 160000,$fake_commit,link2 &&
 	git commit -m "add gitlink" &&
-	git tag -m "annotated tag" mytag
+	git tag -m "annotated tag" mytag &&
+	git tag -m "annotated tag with long message" longtag
 '
 
 test_expect_success 'export anonymized stream' '
 	git fast-export --anonymize --all \
 		--anonymize-map=retain-me \
+		--anonymize-map=xyzzy:should-not-appear \
 		--anonymize-map=xyzzy:custom-name \
 		--anonymize-map=other \
 		>stream
@@ -37,6 +42,7 @@ test_expect_success 'stream omits path names' '
 
 test_expect_success 'stream contains user-specified names' '
 	grep retain-me stream &&
+	! grep should-not-appear stream &&
 	grep custom-name stream
 '
 
@@ -51,8 +57,9 @@ test_expect_success 'stream retains other as refname' '
 '
 
 test_expect_success 'stream omits other refnames' '
-	! grep master stream &&
-	! grep mytag stream
+	! grep main stream &&
+	! grep mytag stream &&
+	! grep longtag stream
 '
 
 test_expect_success 'stream omits identities' '
@@ -85,7 +92,7 @@ test_expect_success 'repo has original shape and timestamps' '
 	shape () {
 		git log --format="%m %ct" --left-right --boundary "$@"
 	} &&
-	(cd .. && shape master...other) >expect &&
+	(cd .. && shape main...other) >expect &&
 	shape $main_branch...$other_branch >actual &&
 	test_cmp expect actual
 '
@@ -115,9 +122,9 @@ test_expect_success 'identical gitlinks got identical oid' '
 	test_line_count = 1 commits
 '
 
-test_expect_success 'tag points to branch tip' '
+test_expect_success 'all tags point to branch tip' '
 	git rev-parse $other_branch >expect &&
-	git for-each-ref --format="%(*objectname)" | grep . >actual &&
+	git for-each-ref --format="%(*objectname)" | grep . | uniq >actual &&
 	test_cmp expect actual
 '
 
diff --git a/t/t9400-git-cvsserver-server.sh b/t/t9400-git-cvsserver-server.sh
index 4a46f31..e499c7f 100755
--- a/t/t9400-git-cvsserver-server.sh
+++ b/t/t9400-git-cvsserver-server.sh
@@ -8,6 +8,9 @@ test_description='git-cvsserver access
 tests read access to a git repository with the
 cvs CLI client via git-cvsserver server'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 if ! test_have_prereq PERL; then
@@ -33,6 +36,13 @@ CVSWORK="$PWD/cvswork"
 CVS_SERVER=git-cvsserver
 export CVSROOT CVS_SERVER
 
+if perl -e 'exit(1) if not defined crypt("", "cv")'
+then
+	PWDHASH='lac2ItudM3.KM'
+else
+	PWDHASH='$2b$10$t8fGvE/a9eLmfOLzsZme2uOa2QtoMYwIxq9wZA6aBKtF1Yb7FJIzi'
+fi
+
 rm -rf "$CVSWORK" "$SERVERDIR"
 test_expect_success 'setup' '
   git config push.default matching &&
@@ -45,21 +55,22 @@ test_expect_success 'setup' '
   touch secondrootfile &&
   git add secondrootfile &&
   git commit -m "second root") &&
-  git fetch secondroot master &&
+  git fetch secondroot main &&
   git merge --allow-unrelated-histories FETCH_HEAD &&
   git clone -q --bare "$WORKDIR/.git" "$SERVERDIR" >/dev/null 2>&1 &&
   GIT_DIR="$SERVERDIR" git config --bool gitcvs.enabled true &&
   GIT_DIR="$SERVERDIR" git config gitcvs.logfile "$SERVERDIR/gitcvs.log" &&
   GIT_DIR="$SERVERDIR" git config gitcvs.authdb "$SERVERDIR/auth.db" &&
-  echo cvsuser:cvGVEarMLnhlA > "$SERVERDIR/auth.db"
+  echo "cvsuser:$PWDHASH" >"$SERVERDIR/auth.db"
 '
 
 # note that cvs doesn't accept absolute pathnames
 # as argument to co -d
-test_expect_success 'basic checkout' \
-  'GIT_CONFIG="$git_config" cvs -Q co -d cvswork master &&
-   test "$(echo $(grep -v ^D cvswork/CVS/Entries|cut -d/ -f2,3,5 | head -n 1))" = "empty/1.1/" &&
-   test "$(echo $(grep -v ^D cvswork/CVS/Entries|cut -d/ -f2,3,5 | sed -ne \$p))" = "secondrootfile/1.1/"'
+test_expect_success 'basic checkout' '
+	GIT_CONFIG="$git_config" cvs -Q co -d cvswork main &&
+	test "$(echo $(grep -v ^D cvswork/CVS/Entries|cut -d/ -f2,3,5 | head -n 1))" = "empty/1.1/" &&
+	test "$(echo $(grep -v ^D cvswork/CVS/Entries|cut -d/ -f2,3,5 | sed -ne \$p))" = "secondrootfile/1.1/"
+'
 
 #------------------------
 # PSERVER AUTHENTICATION
@@ -105,35 +116,40 @@ Ah<Z:yZZ30 e
 END VERIFICATION REQUEST
 EOF
 
-test_expect_success 'pserver authentication' \
-  'cat request-anonymous | git-cvsserver pserver >log 2>&1 &&
-   sed -ne \$p log | grep "^I LOVE YOU\$"'
+test_expect_success 'pserver authentication' '
+	git-cvsserver pserver <request-anonymous >log 2>&1 &&
+	sed -ne \$p log | grep "^I LOVE YOU\$"
+'
 
-test_expect_success 'pserver authentication failure (non-anonymous user)' \
-  'if cat request-git | git-cvsserver pserver >log 2>&1
-   then
-       false
-   else
-       true
-   fi &&
-   sed -ne \$p log | grep "^I HATE YOU\$"'
+test_expect_success 'pserver authentication failure (non-anonymous user)' '
+	if git-cvsserver pserver <request-git >log 2>&1
+	then
+	    false
+	else
+	    true
+	fi &&
+	sed -ne \$p log | grep "^I HATE YOU\$"
+'
 
-test_expect_success 'pserver authentication success (non-anonymous user with password)' \
-  'cat login-git-ok | git-cvsserver pserver >log 2>&1 &&
-   sed -ne \$p log | grep "^I LOVE YOU\$"'
+test_expect_success 'pserver authentication success (non-anonymous user with password)' '
+	git-cvsserver pserver <login-git-ok >log 2>&1 &&
+	sed -ne \$p log | grep "^I LOVE YOU\$"
+'
 
-test_expect_success 'pserver authentication (login)' \
-  'cat login-anonymous | git-cvsserver pserver >log 2>&1 &&
-   sed -ne \$p log | grep "^I LOVE YOU\$"'
+test_expect_success 'pserver authentication (login)' '
+	git-cvsserver pserver <login-anonymous >log 2>&1 &&
+	sed -ne \$p log | grep "^I LOVE YOU\$"
+'
 
-test_expect_success 'pserver authentication failure (login/non-anonymous user)' \
-  'if cat login-git | git-cvsserver pserver >log 2>&1
-   then
-       false
-   else
-       true
-   fi &&
-   sed -ne \$p log | grep "^I HATE YOU\$"'
+test_expect_success 'pserver authentication failure (login/non-anonymous user)' '
+	if git-cvsserver pserver <login-git >log 2>&1
+	then
+	    false
+	else
+	    true
+	fi &&
+	sed -ne \$p log | grep "^I HATE YOU\$"
+'
 
 
 # misuse pserver authentication for testing of req_Root
@@ -155,36 +171,38 @@ END AUTH REQUEST
 Root $WORKDIR
 EOF
 
-test_expect_success 'req_Root failure (relative pathname)' \
-  'if cat request-relative | git-cvsserver pserver >log 2>&1
-   then
-       echo unexpected success
-       false
-   else
-       true
-   fi &&
-   tail log | grep "^error 1 Root must be an absolute pathname$"'
+test_expect_success 'req_Root failure (relative pathname)' '
+	if git-cvsserver pserver <request-relative >log 2>&1
+	then
+		echo unexpected success
+		false
+	else
+		true
+	fi &&
+	tail log | grep "^error 1 Root must be an absolute pathname$"
+'
 
-test_expect_success 'req_Root failure (conflicting roots)' \
-  'cat request-conflict | git-cvsserver pserver >log 2>&1 &&
-   tail log | grep "^error 1 Conflicting roots specified$"'
+test_expect_success 'req_Root failure (conflicting roots)' '
+	git-cvsserver pserver <request-conflict >log 2>&1 &&
+	tail log | grep "^error 1 Conflicting roots specified$"
+'
 
-test_expect_success 'req_Root (strict paths)' \
-  'cat request-anonymous | git-cvsserver --strict-paths pserver "$SERVERDIR" >log 2>&1 &&
-   sed -ne \$p log | grep "^I LOVE YOU\$"'
+test_expect_success 'req_Root (strict paths)' '
+	git-cvsserver --strict-paths pserver "$SERVERDIR" <request-anonymous >log 2>&1 &&
+	sed -ne \$p log | grep "^I LOVE YOU\$"
+'
 
 test_expect_success 'req_Root failure (strict-paths)' '
-    ! cat request-anonymous |
-    git-cvsserver --strict-paths pserver "$WORKDIR" >log 2>&1
+	! git-cvsserver --strict-paths pserver "$WORKDIR" <request-anonymous >log 2>&1
 '
 
-test_expect_success 'req_Root (w/o strict-paths)' \
-  'cat request-anonymous | git-cvsserver pserver "$WORKDIR/" >log 2>&1 &&
-   sed -ne \$p log | grep "^I LOVE YOU\$"'
+test_expect_success 'req_Root (w/o strict-paths)' '
+	git-cvsserver pserver "$WORKDIR/" <request-anonymous >log 2>&1 &&
+	sed -ne \$p log | grep "^I LOVE YOU\$"
+'
 
 test_expect_success 'req_Root failure (w/o strict-paths)' '
-    ! cat request-anonymous |
-    git-cvsserver pserver "$WORKDIR/gitcvs" >log 2>&1
+	! git-cvsserver pserver "$WORKDIR/gitcvs" <request-anonymous >log 2>&1
 '
 
 cat >request-base  <<EOF
@@ -196,27 +214,29 @@ END AUTH REQUEST
 Root /gitcvs.git
 EOF
 
-test_expect_success 'req_Root (base-path)' \
-  'cat request-base | git-cvsserver --strict-paths --base-path "$WORKDIR/" pserver "$SERVERDIR" >log 2>&1 &&
-   sed -ne \$p log | grep "^I LOVE YOU\$"'
+test_expect_success 'req_Root (base-path)' '
+	git-cvsserver --strict-paths --base-path "$WORKDIR/" pserver "$SERVERDIR" <request-base >log 2>&1 &&
+	sed -ne \$p log | grep "^I LOVE YOU\$"
+'
 
 test_expect_success 'req_Root failure (base-path)' '
-    ! cat request-anonymous |
-    git-cvsserver --strict-paths --base-path "$WORKDIR" pserver "$SERVERDIR" >log 2>&1
+	! git-cvsserver --strict-paths --base-path "$WORKDIR" pserver "$SERVERDIR" <request-anonymous >log 2>&1
 '
 
 GIT_DIR="$SERVERDIR" git config --bool gitcvs.enabled false || exit 1
 
-test_expect_success 'req_Root (export-all)' \
-  'cat request-anonymous | git-cvsserver --export-all pserver "$WORKDIR" >log 2>&1 &&
-   sed -ne \$p log | grep "^I LOVE YOU\$"'
+test_expect_success 'req_Root (export-all)' '
+	git-cvsserver --export-all pserver "$WORKDIR" <request-anonymous >log 2>&1 &&
+	sed -ne \$p log | grep "^I LOVE YOU\$"
+'
 
-test_expect_success 'req_Root failure (export-all w/o whitelist)' \
-  '! (cat request-anonymous | git-cvsserver --export-all pserver >log 2>&1 || false)'
+test_expect_success 'req_Root failure (export-all w/o directory list)' '
+	! (git-cvsserver --export-all pserver <request-anonymous >log 2>&1 || false)'
 
-test_expect_success 'req_Root (everything together)' \
-  'cat request-base | git-cvsserver --export-all --strict-paths --base-path "$WORKDIR/" pserver "$SERVERDIR" >log 2>&1 &&
-   sed -ne \$p log | grep "^I LOVE YOU\$"'
+test_expect_success 'req_Root (everything together)' '
+	git-cvsserver --export-all --strict-paths --base-path "$WORKDIR/" pserver "$SERVERDIR" <request-base >log 2>&1 &&
+	sed -ne \$p log | grep "^I LOVE YOU\$"
+'
 
 GIT_DIR="$SERVERDIR" git config --bool gitcvs.enabled true || exit 1
 
@@ -226,7 +246,7 @@ GIT_DIR="$SERVERDIR" git config --bool gitcvs.enabled true || exit 1
 
 test_expect_success 'gitcvs.enabled = false' \
   'GIT_DIR="$SERVERDIR" git config --bool gitcvs.enabled false &&
-   if GIT_CONFIG="$git_config" cvs -Q co -d cvswork2 master >cvs.log 2>&1
+   if GIT_CONFIG="$git_config" cvs -Q co -d cvswork2 main >cvs.log 2>&1
    then
      echo unexpected cvs success
      false
@@ -237,45 +257,49 @@ test_expect_success 'gitcvs.enabled = false' \
    test ! -d cvswork2'
 
 rm -fr cvswork2
-test_expect_success 'gitcvs.ext.enabled = true' \
-  'GIT_DIR="$SERVERDIR" git config --bool gitcvs.ext.enabled true &&
-   GIT_DIR="$SERVERDIR" git config --bool gitcvs.enabled false &&
-   GIT_CONFIG="$git_config" cvs -Q co -d cvswork2 master >cvs.log 2>&1 &&
-   test_cmp cvswork cvswork2'
+test_expect_success 'gitcvs.ext.enabled = true' '
+	GIT_DIR="$SERVERDIR" git config --bool gitcvs.ext.enabled true &&
+	GIT_DIR="$SERVERDIR" git config --bool gitcvs.enabled false &&
+	GIT_CONFIG="$git_config" cvs -Q co -d cvswork2 main >cvs.log 2>&1 &&
+	test_cmp cvswork cvswork2
+'
 
 rm -fr cvswork2
-test_expect_success 'gitcvs.ext.enabled = false' \
-  'GIT_DIR="$SERVERDIR" git config --bool gitcvs.ext.enabled false &&
-   GIT_DIR="$SERVERDIR" git config --bool gitcvs.enabled true &&
-   if GIT_CONFIG="$git_config" cvs -Q co -d cvswork2 master >cvs.log 2>&1
-   then
-     echo unexpected cvs success
-     false
-   else
-     true
-   fi &&
-   grep "GITCVS emulation disabled" cvs.log &&
-   test ! -d cvswork2'
+test_expect_success 'gitcvs.ext.enabled = false' '
+	GIT_DIR="$SERVERDIR" git config --bool gitcvs.ext.enabled false &&
+	GIT_DIR="$SERVERDIR" git config --bool gitcvs.enabled true &&
+	if GIT_CONFIG="$git_config" cvs -Q co -d cvswork2 main >cvs.log 2>&1
+	then
+		echo unexpected cvs success
+		false
+	else
+		true
+	fi &&
+	grep "GITCVS emulation disabled" cvs.log &&
+	test ! -d cvswork2
+'
 
 rm -fr cvswork2
-test_expect_success 'gitcvs.dbname' \
-  'GIT_DIR="$SERVERDIR" git config --bool gitcvs.ext.enabled true &&
-   GIT_DIR="$SERVERDIR" git config gitcvs.dbname %Ggitcvs.%a.%m.sqlite &&
-   GIT_CONFIG="$git_config" cvs -Q co -d cvswork2 master >cvs.log 2>&1 &&
-   test_cmp cvswork cvswork2 &&
-   test -f "$SERVERDIR/gitcvs.ext.master.sqlite" &&
-   cmp "$SERVERDIR/gitcvs.master.sqlite" "$SERVERDIR/gitcvs.ext.master.sqlite"'
+test_expect_success 'gitcvs.dbname' '
+	GIT_DIR="$SERVERDIR" git config --bool gitcvs.ext.enabled true &&
+	GIT_DIR="$SERVERDIR" git config gitcvs.dbname %Ggitcvs.%a.%m.sqlite &&
+	GIT_CONFIG="$git_config" cvs -Q co -d cvswork2 main >cvs.log 2>&1 &&
+	test_cmp cvswork cvswork2 &&
+	test -f "$SERVERDIR/gitcvs.ext.main.sqlite" &&
+	cmp "$SERVERDIR/gitcvs.main.sqlite" "$SERVERDIR/gitcvs.ext.main.sqlite"
+'
 
 rm -fr cvswork2
-test_expect_success 'gitcvs.ext.dbname' \
-  'GIT_DIR="$SERVERDIR" git config --bool gitcvs.ext.enabled true &&
-   GIT_DIR="$SERVERDIR" git config gitcvs.ext.dbname %Ggitcvs1.%a.%m.sqlite &&
-   GIT_DIR="$SERVERDIR" git config gitcvs.dbname %Ggitcvs2.%a.%m.sqlite &&
-   GIT_CONFIG="$git_config" cvs -Q co -d cvswork2 master >cvs.log 2>&1 &&
-   test_cmp cvswork cvswork2 &&
-   test -f "$SERVERDIR/gitcvs1.ext.master.sqlite" &&
-   test ! -f "$SERVERDIR/gitcvs2.ext.master.sqlite" &&
-   cmp "$SERVERDIR/gitcvs.master.sqlite" "$SERVERDIR/gitcvs1.ext.master.sqlite"'
+test_expect_success 'gitcvs.ext.dbname' '
+	GIT_DIR="$SERVERDIR" git config --bool gitcvs.ext.enabled true &&
+	GIT_DIR="$SERVERDIR" git config gitcvs.ext.dbname %Ggitcvs1.%a.%m.sqlite &&
+	GIT_DIR="$SERVERDIR" git config gitcvs.dbname %Ggitcvs2.%a.%m.sqlite &&
+	GIT_CONFIG="$git_config" cvs -Q co -d cvswork2 main >cvs.log 2>&1 &&
+	test_cmp cvswork cvswork2 &&
+	test -f "$SERVERDIR/gitcvs1.ext.main.sqlite" &&
+	test ! -f "$SERVERDIR/gitcvs2.ext.main.sqlite" &&
+	cmp "$SERVERDIR/gitcvs.main.sqlite" "$SERVERDIR/gitcvs1.ext.main.sqlite"
+'
 
 
 #------------
@@ -289,110 +313,115 @@ GIT_DIR="$SERVERDIR" git config --bool gitcvs.enabled true &&
 GIT_DIR="$SERVERDIR" git config gitcvs.logfile "$SERVERDIR/gitcvs.log" ||
 exit 1
 
-test_expect_success 'cvs update (create new file)' \
-  'echo testfile1 >testfile1 &&
-   git add testfile1 &&
-   git commit -q -m "Add testfile1" &&
-   git push gitcvs.git >/dev/null &&
-   cd cvswork &&
-   GIT_CONFIG="$git_config" cvs -Q update &&
-   test "$(echo $(grep testfile1 CVS/Entries|cut -d/ -f2,3,5))" = "testfile1/1.1/" &&
-   test_cmp testfile1 ../testfile1'
+test_expect_success 'cvs update (create new file)' '
+	echo testfile1 >testfile1 &&
+	git add testfile1 &&
+	git commit -q -m "Add testfile1" &&
+	git push gitcvs.git >/dev/null &&
+	cd cvswork &&
+	GIT_CONFIG="$git_config" cvs -Q update &&
+	test "$(echo $(grep testfile1 CVS/Entries|cut -d/ -f2,3,5))" = "testfile1/1.1/" &&
+	test_cmp testfile1 ../testfile1
+'
 
 cd "$WORKDIR"
-test_expect_success 'cvs update (update existing file)' \
-  'echo line 2 >>testfile1 &&
-   git add testfile1 &&
-   git commit -q -m "Append to testfile1" &&
-   git push gitcvs.git >/dev/null &&
-   cd cvswork &&
-   GIT_CONFIG="$git_config" cvs -Q update &&
-   test "$(echo $(grep testfile1 CVS/Entries|cut -d/ -f2,3,5))" = "testfile1/1.2/" &&
-   test_cmp testfile1 ../testfile1'
+test_expect_success 'cvs update (update existing file)' '
+	echo line 2 >>testfile1 &&
+	git add testfile1 &&
+	git commit -q -m "Append to testfile1" &&
+	git push gitcvs.git >/dev/null &&
+	cd cvswork &&
+	GIT_CONFIG="$git_config" cvs -Q update &&
+	test "$(echo $(grep testfile1 CVS/Entries|cut -d/ -f2,3,5))" = "testfile1/1.2/" &&
+	test_cmp testfile1 ../testfile1
+'
 
 cd "$WORKDIR"
 #TODO: cvsserver doesn't support update w/o -d
 test_expect_failure "cvs update w/o -d doesn't create subdir (TODO)" '
-   mkdir test &&
-   echo >test/empty &&
-   git add test &&
-   git commit -q -m "Single Subdirectory" &&
-   git push gitcvs.git >/dev/null &&
-   cd cvswork &&
-   GIT_CONFIG="$git_config" cvs -Q update &&
-   test ! -d test
+	mkdir test &&
+	echo >test/empty &&
+	git add test &&
+	git commit -q -m "Single Subdirectory" &&
+	git push gitcvs.git >/dev/null &&
+	cd cvswork &&
+	GIT_CONFIG="$git_config" cvs -Q update &&
+	test ! -d test
 '
 
 cd "$WORKDIR"
-test_expect_success 'cvs update (subdirectories)' \
-  '(for dir in A A/B A/B/C A/D E; do
-      mkdir $dir &&
-      echo "test file in $dir" >"$dir/file_in_$(echo $dir|sed -e "s#/# #g")"  &&
-      git add $dir
-   done) &&
-   git commit -q -m "deep sub directory structure" &&
-   git push gitcvs.git >/dev/null &&
-   cd cvswork &&
-   GIT_CONFIG="$git_config" cvs -Q update -d &&
-   (for dir in A A/B A/B/C A/D E; do
-      filename="file_in_$(echo $dir|sed -e "s#/# #g")" &&
-      if test "$(echo $(grep -v ^D $dir/CVS/Entries|cut -d/ -f2,3,5))" = "$filename/1.1/" &&
-	test_cmp "$dir/$filename" "../$dir/$filename"; then
-        :
-      else
-        echo >failure
-      fi
-    done) &&
-   test ! -f failure'
+test_expect_success 'cvs update (subdirectories)' '
+	(for dir in A A/B A/B/C A/D E; do
+		mkdir $dir &&
+		echo "test file in $dir" >"$dir/file_in_$(echo $dir|sed -e "s#/# #g")"  &&
+		git add $dir || exit 1
+	done) &&
+	git commit -q -m "deep sub directory structure" &&
+	git push gitcvs.git >/dev/null &&
+	cd cvswork &&
+	GIT_CONFIG="$git_config" cvs -Q update -d &&
+	(for dir in A A/B A/B/C A/D E; do
+		filename="file_in_$(echo $dir|sed -e "s#/# #g")" &&
+		if test "$(echo $(grep -v ^D $dir/CVS/Entries|cut -d/ -f2,3,5))" = "$filename/1.1/" &&
+			test_cmp "$dir/$filename" "../$dir/$filename"; then
+		:
+		else
+			exit 1
+		fi
+	done)
+'
 
 cd "$WORKDIR"
-test_expect_success 'cvs update (delete file)' \
-  'git rm testfile1 &&
-   git commit -q -m "Remove testfile1" &&
-   git push gitcvs.git >/dev/null &&
-   cd cvswork &&
-   GIT_CONFIG="$git_config" cvs -Q update &&
-   test -z "$(grep testfile1 CVS/Entries)" &&
-   test ! -f testfile1'
+test_expect_success 'cvs update (delete file)' '
+	git rm testfile1 &&
+	git commit -q -m "Remove testfile1" &&
+	git push gitcvs.git >/dev/null &&
+	cd cvswork &&
+	GIT_CONFIG="$git_config" cvs -Q update &&
+	test -z "$(grep testfile1 CVS/Entries)" &&
+	test ! -f testfile1
+'
 
 cd "$WORKDIR"
-test_expect_success 'cvs update (re-add deleted file)' \
-  'echo readded testfile >testfile1 &&
-   git add testfile1 &&
-   git commit -q -m "Re-Add testfile1" &&
-   git push gitcvs.git >/dev/null &&
-   cd cvswork &&
-   GIT_CONFIG="$git_config" cvs -Q update &&
-   test "$(echo $(grep testfile1 CVS/Entries|cut -d/ -f2,3,5))" = "testfile1/1.4/" &&
-   test_cmp testfile1 ../testfile1'
+test_expect_success 'cvs update (re-add deleted file)' '
+	echo readded testfile >testfile1 &&
+	git add testfile1 &&
+	git commit -q -m "Re-Add testfile1" &&
+	git push gitcvs.git >/dev/null &&
+	cd cvswork &&
+	GIT_CONFIG="$git_config" cvs -Q update &&
+	test "$(echo $(grep testfile1 CVS/Entries|cut -d/ -f2,3,5))" = "testfile1/1.4/" &&
+	test_cmp testfile1 ../testfile1
+'
 
 cd "$WORKDIR"
-test_expect_success 'cvs update (merge)' \
-  'echo Line 0 >expected &&
-   for i in 1 2 3 4 5 6 7
-   do
-     echo Line $i >>merge &&
-     echo Line $i >>expected
-   done &&
-   echo Line 8 >>expected &&
-   git add merge &&
-   git commit -q -m "Merge test (pre-merge)" &&
-   git push gitcvs.git >/dev/null &&
-   cd cvswork &&
-   GIT_CONFIG="$git_config" cvs -Q update &&
-   test "$(echo $(grep merge CVS/Entries|cut -d/ -f2,3,5))" = "merge/1.1/" &&
-   test_cmp merge ../merge &&
-   ( echo Line 0 && cat merge ) >merge.tmp &&
-   mv merge.tmp merge &&
-   cd "$WORKDIR" &&
-   echo Line 8 >>merge &&
-   git add merge &&
-   git commit -q -m "Merge test (merge)" &&
-   git push gitcvs.git >/dev/null &&
-   cd cvswork &&
-   sleep 1 && touch merge &&
-   GIT_CONFIG="$git_config" cvs -Q update &&
-   test_cmp merge ../expected'
+test_expect_success 'cvs update (merge)' '
+	echo Line 0 >expected &&
+	for i in 1 2 3 4 5 6 7
+	do
+		echo Line $i >>merge &&
+		echo Line $i >>expected || return 1
+	done &&
+	echo Line 8 >>expected &&
+	git add merge &&
+	git commit -q -m "Merge test (pre-merge)" &&
+	git push gitcvs.git >/dev/null &&
+	cd cvswork &&
+	GIT_CONFIG="$git_config" cvs -Q update &&
+	test "$(echo $(grep merge CVS/Entries|cut -d/ -f2,3,5))" = "merge/1.1/" &&
+	test_cmp merge ../merge &&
+	( echo Line 0 && cat merge ) >merge.tmp &&
+	mv merge.tmp merge &&
+	cd "$WORKDIR" &&
+	echo Line 8 >>merge &&
+	git add merge &&
+	git commit -q -m "Merge test (merge)" &&
+	git push gitcvs.git >/dev/null &&
+	cd cvswork &&
+	sleep 1 && touch merge &&
+	GIT_CONFIG="$git_config" cvs -Q update &&
+	test_cmp merge ../expected
+'
 
 cd "$WORKDIR"
 
@@ -409,55 +438,58 @@ do
   echo Line $i >>expected.C
 done
 
-test_expect_success 'cvs update (conflict merge)' \
-  '( echo LINE 0 && cat merge ) >merge.tmp &&
-   mv merge.tmp merge &&
-   git add merge &&
-   git commit -q -m "Merge test (conflict)" &&
-   git push gitcvs.git >/dev/null &&
-   cd cvswork &&
-   GIT_CONFIG="$git_config" cvs -Q update &&
-   test_cmp merge ../expected.C'
+test_expect_success 'cvs update (conflict merge)' '
+	( echo LINE 0 && cat merge ) >merge.tmp &&
+	mv merge.tmp merge &&
+	git add merge &&
+	git commit -q -m "Merge test (conflict)" &&
+	git push gitcvs.git >/dev/null &&
+	cd cvswork &&
+	GIT_CONFIG="$git_config" cvs -Q update &&
+	test_cmp merge ../expected.C
+'
 
 cd "$WORKDIR"
-test_expect_success 'cvs update (-C)' \
-  'cd cvswork &&
-   GIT_CONFIG="$git_config" cvs -Q update -C &&
-   test_cmp merge ../merge'
+test_expect_success 'cvs update (-C)' '
+	cd cvswork &&
+	GIT_CONFIG="$git_config" cvs -Q update -C &&
+	test_cmp merge ../merge
+'
 
 cd "$WORKDIR"
-test_expect_success 'cvs update (merge no-op)' \
-   'echo Line 9 >>merge &&
-    cp merge cvswork/merge &&
-    git add merge &&
-    git commit -q -m "Merge test (no-op)" &&
-    git push gitcvs.git >/dev/null &&
-    cd cvswork &&
-    sleep 1 && touch merge &&
-    GIT_CONFIG="$git_config" cvs -Q update &&
-    test_cmp merge ../merge'
+test_expect_success 'cvs update (merge no-op)' '
+	echo Line 9 >>merge &&
+	cp merge cvswork/merge &&
+	git add merge &&
+	git commit -q -m "Merge test (no-op)" &&
+	git push gitcvs.git >/dev/null &&
+	cd cvswork &&
+	sleep 1 && touch merge &&
+	GIT_CONFIG="$git_config" cvs -Q update &&
+	test_cmp merge ../merge
+'
 
 cd "$WORKDIR"
 test_expect_success 'cvs update (-p)' '
-    touch really-empty &&
-    echo Line 1 > no-lf &&
-    printf "Line 2" >> no-lf &&
-    git add really-empty no-lf &&
-    git commit -q -m "Update -p test" &&
-    git push gitcvs.git >/dev/null &&
-    cd cvswork &&
-    GIT_CONFIG="$git_config" cvs update &&
-    for i in merge no-lf empty really-empty; do
-	GIT_CONFIG="$git_config" cvs update -p "$i" >$i.out &&
-	test_cmp $i.out ../$i || return 1
-    done
+	touch really-empty &&
+	echo Line 1 > no-lf &&
+	printf "Line 2" >> no-lf &&
+	git add really-empty no-lf &&
+	git commit -q -m "Update -p test" &&
+	git push gitcvs.git >/dev/null &&
+	cd cvswork &&
+	GIT_CONFIG="$git_config" cvs update &&
+	for i in merge no-lf empty really-empty; do
+		GIT_CONFIG="$git_config" cvs update -p "$i" >$i.out &&
+		test_cmp $i.out ../$i || return 1
+	done
 '
 
 cd "$WORKDIR"
 test_expect_success 'cvs update (module list supports packed refs)' '
-    GIT_DIR="$SERVERDIR" git pack-refs --all &&
-    GIT_CONFIG="$git_config" cvs -n up -d 2> out &&
-    grep "cvs update: New directory \`master'\''" < out
+	GIT_DIR="$SERVERDIR" git pack-refs --all &&
+	GIT_CONFIG="$git_config" cvs -n up -d 2> out &&
+	grep "cvs update: New directory \`main'\''" < out
 '
 
 #------------
@@ -466,30 +498,30 @@ test_expect_success 'cvs update (module list supports packed refs)' '
 
 cd "$WORKDIR"
 test_expect_success 'cvs status' '
-    mkdir status.dir &&
-    echo Line > status.dir/status.file &&
-    echo Line > status.file &&
-    git add status.dir status.file &&
-    git commit -q -m "Status test" &&
-    git push gitcvs.git >/dev/null &&
-    cd cvswork &&
-    GIT_CONFIG="$git_config" cvs update &&
-    GIT_CONFIG="$git_config" cvs status | grep "^File: status.file" >../out &&
-    test_line_count = 2 ../out
+	mkdir status.dir &&
+	echo Line > status.dir/status.file &&
+	echo Line > status.file &&
+	git add status.dir status.file &&
+	git commit -q -m "Status test" &&
+	git push gitcvs.git >/dev/null &&
+	cd cvswork &&
+	GIT_CONFIG="$git_config" cvs update &&
+	GIT_CONFIG="$git_config" cvs status | grep "^File: status.file" >../out &&
+	test_line_count = 2 ../out
 '
 
 cd "$WORKDIR"
 test_expect_success 'cvs status (nonrecursive)' '
-    cd cvswork &&
-    GIT_CONFIG="$git_config" cvs status -l | grep "^File: status.file" >../out &&
-    test_line_count = 1 ../out
+	cd cvswork &&
+	GIT_CONFIG="$git_config" cvs status -l | grep "^File: status.file" >../out &&
+	test_line_count = 1 ../out
 '
 
 cd "$WORKDIR"
 test_expect_success 'cvs status (no subdirs in header)' '
-    cd cvswork &&
-    GIT_CONFIG="$git_config" cvs status | grep ^File: >../out &&
-    ! grep / <../out
+	cd cvswork &&
+	GIT_CONFIG="$git_config" cvs status | grep ^File: >../out &&
+	! grep / <../out
 '
 
 #------------
@@ -498,9 +530,9 @@ test_expect_success 'cvs status (no subdirs in header)' '
 
 cd "$WORKDIR"
 test_expect_success 'cvs co -c (shows module database)' '
-    GIT_CONFIG="$git_config" cvs co -c > out &&
-    grep "^master[	 ][ 	]*master$" <out &&
-    ! grep -v "^master[	 ][ 	]*master$" <out
+	GIT_CONFIG="$git_config" cvs co -c > out &&
+	grep "^main[	 ][ 	]*main$" <out &&
+	! grep -v "^main[	 ][ 	]*main$" <out
 '
 
 #------------
@@ -526,7 +558,7 @@ test_expect_success 'cvs co -c (shows module database)' '
 
 sed -e 's/^x//' -e 's/SP$/ /' > "$WORKDIR/expect" <<EOF
 x
-xRCS file: $WORKDIR/gitcvs.git/master/merge,v
+xRCS file: $WORKDIR/gitcvs.git/main/merge,v
 xWorking file: merge
 xhead: 1.4
 xbranch:
@@ -566,11 +598,11 @@ expectStat="$?"
 
 cd "$WORKDIR"
 test_expect_success 'cvs log' '
-    cd cvswork &&
-    test x"$expectStat" = x"0" &&
-    GIT_CONFIG="$git_config" cvs log merge >../out &&
-    sed -e "s%2[0-9][0-9][0-9]/[01][0-9]/[0-3][0-9] [0-2][0-9]:[0-5][0-9]:[0-5][0-9]%__DATE__%" ../out > ../actual &&
-    test_cmp ../expect ../actual
+	cd cvswork &&
+	test x"$expectStat" = x"0" &&
+	GIT_CONFIG="$git_config" cvs log merge >../out &&
+sed -e "s%2[0-9][0-9][0-9]/[01][0-9]/[0-3][0-9] [0-2][0-9]:[0-5][0-9]:[0-5][0-9]%__DATE__%" ../out > ../actual &&
+	test_cmp ../expect ../actual
 '
 
 #------------
@@ -579,11 +611,11 @@ test_expect_success 'cvs log' '
 
 cd "$WORKDIR"
 test_expect_success 'cvs annotate' '
-    cd cvswork &&
-    GIT_CONFIG="$git_config" cvs annotate merge >../out &&
-    sed -e "s/ .*//" ../out >../actual &&
-    for i in 3 1 1 1 1 1 1 1 2 4; do echo 1.$i; done >../expect &&
-    test_cmp ../expect ../actual
+	cd cvswork &&
+	GIT_CONFIG="$git_config" cvs annotate merge >../out &&
+	sed -e "s/ .*//" ../out >../actual &&
+	printf "1.%d\n" 3 1 1 1 1 1 1 1 2 4 >../expect &&
+	test_cmp ../expect ../actual
 '
 
 #------------
diff --git a/t/t9401-git-cvsserver-crlf.sh b/t/t9401-git-cvsserver-crlf.sh
index c7a0dd8..a34805a 100755
--- a/t/t9401-git-cvsserver-crlf.sh
+++ b/t/t9401-git-cvsserver-crlf.sh
@@ -9,6 +9,9 @@ test_description='git-cvsserver -kb modes
 tests -kb mode for binary files when accessing a git
 repository using cvs CLI client via git-cvsserver server'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 marked_as () {
@@ -105,14 +108,14 @@ test_expect_success 'setup' '
 '
 
 test_expect_success 'cvs co (default crlf)' '
-    GIT_CONFIG="$git_config" cvs -Q co -d cvswork master >cvs.log 2>&1 &&
+    GIT_CONFIG="$git_config" cvs -Q co -d cvswork main >cvs.log 2>&1 &&
     test x"$(grep '/-k' cvswork/CVS/Entries cvswork/subdir/CVS/Entries)" = x""
 '
 
 rm -rf cvswork
 test_expect_success 'cvs co (allbinary)' '
     GIT_DIR="$SERVERDIR" git config --bool gitcvs.allbinary true &&
-    GIT_CONFIG="$git_config" cvs -Q co -d cvswork master >cvs.log 2>&1 &&
+    GIT_CONFIG="$git_config" cvs -Q co -d cvswork main >cvs.log 2>&1 &&
     marked_as cvswork textfile.c -kb &&
     marked_as cvswork binfile.bin -kb &&
     marked_as cvswork .gitattributes -kb &&
@@ -125,7 +128,7 @@ test_expect_success 'cvs co (allbinary)' '
 rm -rf cvswork cvs.log
 test_expect_success 'cvs co (use attributes/allbinary)' '
     GIT_DIR="$SERVERDIR" git config --bool gitcvs.usecrlfattr true &&
-    GIT_CONFIG="$git_config" cvs -Q co -d cvswork master >cvs.log 2>&1 &&
+    GIT_CONFIG="$git_config" cvs -Q co -d cvswork main >cvs.log 2>&1 &&
     marked_as cvswork textfile.c "" &&
     marked_as cvswork binfile.bin -kb &&
     marked_as cvswork .gitattributes -kb &&
@@ -138,7 +141,7 @@ test_expect_success 'cvs co (use attributes/allbinary)' '
 rm -rf cvswork
 test_expect_success 'cvs co (use attributes)' '
     GIT_DIR="$SERVERDIR" git config --bool gitcvs.allbinary false &&
-    GIT_CONFIG="$git_config" cvs -Q co -d cvswork master >cvs.log 2>&1 &&
+    GIT_CONFIG="$git_config" cvs -Q co -d cvswork main >cvs.log 2>&1 &&
     marked_as cvswork textfile.c "" &&
     marked_as cvswork binfile.bin -kb &&
     marked_as cvswork .gitattributes "" &&
@@ -194,7 +197,7 @@ test_expect_success 'updating' '
 rm -rf cvswork
 test_expect_success 'cvs co (use attributes/guess)' '
     GIT_DIR="$SERVERDIR" git config gitcvs.allbinary guess &&
-    GIT_CONFIG="$git_config" cvs -Q co -d cvswork master >cvs.log 2>&1 &&
+    GIT_CONFIG="$git_config" cvs -Q co -d cvswork main >cvs.log 2>&1 &&
     marked_as cvswork textfile.c "" &&
     marked_as cvswork binfile.bin -kb &&
     marked_as cvswork .gitattributes "" &&
@@ -224,7 +227,7 @@ test_expect_success 'setup multi-line files' '
 rm -rf cvswork
 test_expect_success 'cvs co (guess)' '
     GIT_DIR="$SERVERDIR" git config --bool gitcvs.usecrlfattr false &&
-    GIT_CONFIG="$git_config" cvs -Q co -d cvswork master >cvs.log 2>&1 &&
+    GIT_CONFIG="$git_config" cvs -Q co -d cvswork main >cvs.log 2>&1 &&
     marked_as cvswork textfile.c "" &&
     marked_as cvswork binfile.bin -kb &&
     marked_as cvswork .gitattributes "" &&
@@ -239,7 +242,7 @@ test_expect_success 'cvs co (guess)' '
 '
 
 test_expect_success 'cvs co another copy (guess)' '
-    GIT_CONFIG="$git_config" cvs -Q co -d cvswork2 master >cvs.log 2>&1 &&
+    GIT_CONFIG="$git_config" cvs -Q co -d cvswork2 main >cvs.log 2>&1 &&
     marked_as cvswork2 textfile.c "" &&
     marked_as cvswork2 binfile.bin -kb &&
     marked_as cvswork2 .gitattributes "" &&
@@ -335,7 +338,7 @@ test_expect_success 'update subdir of other copy (guess)' '
 
 echo "starting update/merge" >> "${WORKDIR}/marked.log"
 test_expect_success 'update/merge full other copy (guess)' '
-    git pull gitcvs.git master &&
+    git pull gitcvs.git main &&
     sed "s/3/replaced_3/" < multilineTxt.c > ml.temp &&
     mv ml.temp multilineTxt.c &&
     git add multilineTxt.c &&
diff --git a/t/t9402-git-cvsserver-refs.sh b/t/t9402-git-cvsserver-refs.sh
index 6436c91..2ee41f9 100755
--- a/t/t9402-git-cvsserver-refs.sh
+++ b/t/t9402-git-cvsserver-refs.sh
@@ -5,6 +5,9 @@ test_description='git-cvsserver and git refspecs
 tests ability for git-cvsserver to switch between and compare
 tags, branches and other git refspecs'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./test-lib.sh
 
 #########
@@ -115,7 +118,7 @@ test_expect_success 'setup v1, b1' '
 
 rm -rf cvswork
 test_expect_success 'cvs co v1' '
-	cvs -f -Q co -r v1 -d cvswork master >cvs.log 2>&1 &&
+	cvs -f -Q co -r v1 -d cvswork main >cvs.log 2>&1 &&
 	check_start_tree cvswork &&
 	check_file cvswork textfile.c v1 &&
 	check_file cvswork t2 v1 &&
@@ -128,7 +131,7 @@ test_expect_success 'cvs co v1' '
 
 rm -rf cvswork
 test_expect_success 'cvs co b1' '
-	cvs -f co -r b1 -d cvswork master >cvs.log 2>&1 &&
+	cvs -f co -r b1 -d cvswork main >cvs.log 2>&1 &&
 	check_start_tree cvswork &&
 	check_file cvswork textfile.c v1 &&
 	check_file cvswork t2 v1 &&
@@ -140,7 +143,7 @@ test_expect_success 'cvs co b1' '
 '
 
 test_expect_success 'cvs co b1 [cvswork3]' '
-	cvs -f co -r b1 -d cvswork3 master >cvs.log 2>&1 &&
+	cvs -f co -r b1 -d cvswork3 main >cvs.log 2>&1 &&
 	check_start_tree cvswork3 &&
 	check_file cvswork3 textfile.c v1 &&
 	check_file cvswork3 t2 v1 &&
@@ -265,7 +268,7 @@ test_expect_success 'setup simple b2' '
 '
 
 test_expect_success 'cvs co b2 [into cvswork2]' '
-	cvs -f co -r b2 -d cvswork2 master >cvs.log 2>&1 &&
+	cvs -f co -r b2 -d cvswork2 main >cvs.log 2>&1 &&
 	check_start_tree cvswork &&
 	check_file cvswork textfile.c v1 &&
 	check_file cvswork t2 v1 &&
diff --git a/t/t9500-gitweb-standalone-no-errors.sh b/t/t9500-gitweb-standalone-no-errors.sh
index b484e3e..7679780 100755
--- a/t/t9500-gitweb-standalone-no-errors.sh
+++ b/t/t9500-gitweb-standalone-no-errors.sh
@@ -10,7 +10,10 @@ commandline, and checks that it would not write any errors
 or warnings to log.'
 
 
-. ./gitweb-lib.sh
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+. ./lib-gitweb.sh
 
 # ----------------------------------------------------------------------
 # no commits (empty, just initialized repository)
@@ -327,7 +330,7 @@ test_expect_success \
 	 echo "Branch" >>b &&
 	 git add b &&
 	 git commit -a -m "On branch" &&
-	 git checkout master &&
+	 git checkout main &&
 	 git merge b &&
 	 git tag merge_commit'
 
@@ -364,7 +367,7 @@ test_expect_success \
 	 echo "Changed and have mode changed" >07-change-mode-change &&
 	 test_chmod +x 07-change-mode-change &&
 	 git commit -a -m "Large commit" &&
-	 git checkout master'
+	 git checkout main'
 
 test_expect_success \
 	'commit(1): large commit' \
@@ -402,7 +405,7 @@ test_expect_success 'side-by-side: merge commit' '
 
 test_expect_success \
 	'tags: list of different types of tags' \
-	'git checkout master &&
+	'git checkout main &&
 	 git tag -a -m "Tag commit object" tag-commit HEAD &&
 	 git tag -a -m "" tag-commit-nomessage HEAD &&
 	 git tag -a -m "Tag tag object" tag-tag tag-commit &&
@@ -443,7 +446,7 @@ test_expect_success \
 
 test_expect_success \
 	'logs: history (implicit HEAD, deleted file)' \
-	'git checkout master &&
+	'git checkout main &&
 	 echo "to be deleted" >deleted_file &&
 	 git add deleted_file &&
 	 git commit -m "Add file to be deleted" &&
@@ -463,11 +466,11 @@ test_expect_success \
 
 test_expect_success \
 	'path_info: project/branch:file' \
-	'gitweb_run "" "/.git/master:file"'
+	'gitweb_run "" "/.git/main:file"'
 
 test_expect_success \
 	'path_info: project/branch:dir/' \
-	'gitweb_run "" "/.git/master:foo/"'
+	'gitweb_run "" "/.git/main:foo/"'
 
 test_expect_success \
 	'path_info: project/branch (non-existent)' \
@@ -479,16 +482,16 @@ test_expect_success \
 
 test_expect_success \
 	'path_info: project/branch:file (non-existent)' \
-	'gitweb_run "" "/.git/master:non-existent"'
+	'gitweb_run "" "/.git/main:non-existent"'
 
 test_expect_success \
 	'path_info: project/branch:dir/ (non-existent)' \
-	'gitweb_run "" "/.git/master:non-existent/"'
+	'gitweb_run "" "/.git/main:non-existent/"'
 
 
 test_expect_success \
 	'path_info: project/branch:/file' \
-	'gitweb_run "" "/.git/master:/file"'
+	'gitweb_run "" "/.git/main:/file"'
 
 test_expect_success \
 	'path_info: project/:/file (implicit HEAD)' \
@@ -624,6 +627,7 @@ test_expect_success \
 test_expect_success 'setup' '
 	version=$(git config core.repositoryformatversion) &&
 	algo=$(test_might_fail git config extensions.objectformat) &&
+	refstorage=$(test_might_fail git config extensions.refstorage) &&
 	cat >.git/config <<-\EOF &&
 	# testing noval and alternate separator
 	[gitweb]
@@ -634,6 +638,10 @@ test_expect_success 'setup' '
 	if test -n "$algo"
 	then
 		git config extensions.objectformat "$algo"
+	fi &&
+	if test -n "$refstorage"
+	then
+		git config extensions.refstorage "$refstorage"
 	fi
 '
 
@@ -801,7 +809,7 @@ test_expect_success \
 		git checkout orphan_branch ||
 		git checkout --orphan orphan_branch
 	 } &&
-	 test_when_finished "git checkout master" &&
+	 test_when_finished "git checkout main" &&
 	 gitweb_run "p=.git;a=summary"'
 
 test_done
diff --git a/t/t9501-gitweb-standalone-http-status.sh b/t/t9501-gitweb-standalone-http-status.sh
index 2a0ffed..c900231 100755
--- a/t/t9501-gitweb-standalone-http-status.sh
+++ b/t/t9501-gitweb-standalone-http-status.sh
@@ -10,7 +10,11 @@ commandline, and checks that it returns the expected HTTP status
 code and message.'
 
 
-. ./gitweb-lib.sh
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./lib-gitweb.sh
 
 #
 # Gitweb only provides the functionality tested by the 'modification times'
@@ -85,7 +89,7 @@ test_debug 'cat gitweb.headers'
 # snapshot hash ids
 
 test_expect_success 'snapshots: good tree-ish id' '
-	gitweb_run "p=.git;a=snapshot;h=master;sf=tgz" &&
+	gitweb_run "p=.git;a=snapshot;h=main;sf=tgz" &&
 	grep "Status: 200 OK" gitweb.output
 '
 test_debug 'cat gitweb.headers'
@@ -123,7 +127,7 @@ test_debug 'cat gitweb.output'
 # modification times (Last-Modified and If-Modified-Since)
 
 test_expect_success DATE_PARSER 'modification: feed last-modified' '
-	gitweb_run "p=.git;a=atom;h=master" &&
+	gitweb_run "p=.git;a=atom;h=main" &&
 	grep "Status: 200 OK" gitweb.headers &&
 	grep "Last-modified: Thu, 7 Apr 2005 22:14:13 +0000" gitweb.headers
 '
@@ -133,7 +137,7 @@ test_expect_success DATE_PARSER 'modification: feed if-modified-since (modified)
 	HTTP_IF_MODIFIED_SINCE="Wed, 6 Apr 2005 22:14:13 +0000" &&
 	export HTTP_IF_MODIFIED_SINCE &&
 	test_when_finished "unset HTTP_IF_MODIFIED_SINCE" &&
-	gitweb_run "p=.git;a=atom;h=master" &&
+	gitweb_run "p=.git;a=atom;h=main" &&
 	grep "Status: 200 OK" gitweb.headers
 '
 test_debug 'cat gitweb.headers'
@@ -142,13 +146,13 @@ test_expect_success DATE_PARSER 'modification: feed if-modified-since (unmodifie
 	HTTP_IF_MODIFIED_SINCE="Thu, 7 Apr 2005 22:14:13 +0000" &&
 	export HTTP_IF_MODIFIED_SINCE &&
 	test_when_finished "unset HTTP_IF_MODIFIED_SINCE" &&
-	gitweb_run "p=.git;a=atom;h=master" &&
+	gitweb_run "p=.git;a=atom;h=main" &&
 	grep "Status: 304 Not Modified" gitweb.headers
 '
 test_debug 'cat gitweb.headers'
 
 test_expect_success DATE_PARSER 'modification: snapshot last-modified' '
-	gitweb_run "p=.git;a=snapshot;h=master;sf=tgz" &&
+	gitweb_run "p=.git;a=snapshot;h=main;sf=tgz" &&
 	grep "Status: 200 OK" gitweb.headers &&
 	grep "Last-modified: Thu, 7 Apr 2005 22:14:13 +0000" gitweb.headers
 '
@@ -158,7 +162,7 @@ test_expect_success DATE_PARSER 'modification: snapshot if-modified-since (modif
 	HTTP_IF_MODIFIED_SINCE="Wed, 6 Apr 2005 22:14:13 +0000" &&
 	export HTTP_IF_MODIFIED_SINCE &&
 	test_when_finished "unset HTTP_IF_MODIFIED_SINCE" &&
-	gitweb_run "p=.git;a=snapshot;h=master;sf=tgz" &&
+	gitweb_run "p=.git;a=snapshot;h=main;sf=tgz" &&
 	grep "Status: 200 OK" gitweb.headers
 '
 test_debug 'cat gitweb.headers'
@@ -167,7 +171,7 @@ test_expect_success DATE_PARSER 'modification: snapshot if-modified-since (unmod
 	HTTP_IF_MODIFIED_SINCE="Thu, 7 Apr 2005 22:14:13 +0000" &&
 	export HTTP_IF_MODIFIED_SINCE &&
 	test_when_finished "unset HTTP_IF_MODIFIED_SINCE" &&
-	gitweb_run "p=.git;a=snapshot;h=master;sf=tgz" &&
+	gitweb_run "p=.git;a=snapshot;h=main;sf=tgz" &&
 	grep "Status: 304 Not Modified" gitweb.headers
 '
 test_debug 'cat gitweb.headers'
diff --git a/t/t9502-gitweb-standalone-parse-output.sh b/t/t9502-gitweb-standalone-parse-output.sh
index e38cbc9..81d5625 100755
--- a/t/t9502-gitweb-standalone-parse-output.sh
+++ b/t/t9502-gitweb-standalone-parse-output.sh
@@ -10,7 +10,10 @@ commandline, and checks that it produces the correct output, either
 in the HTTP header or the actual script output.'
 
 
-. ./gitweb-lib.sh
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+. ./lib-gitweb.sh
 
 # ----------------------------------------------------------------------
 # snapshot file name and prefix
@@ -31,7 +34,7 @@ EOF
 #
 # This will check that gitweb HTTP header contains proposed filename
 # as <basename> with '.tar' suffix added, and that generated tarfile
-# (gitweb message body) has <prefix> as prefix for al files in tarfile
+# (gitweb message body) has <prefix> as prefix for all files in tarfile
 #
 # <prefix> default to <basename>
 check_snapshot () {
@@ -79,10 +82,10 @@ test_expect_success 'snapshot: HEAD' '
 '
 test_debug 'cat gitweb.headers && cat file_list'
 
-test_expect_success 'snapshot: short branch name (master)' '
-	gitweb_run "p=.git;a=snapshot;h=master;sf=tar" &&
-	ID=$(git rev-parse --verify --short=7 master) &&
-	check_snapshot ".git-master-$ID"
+test_expect_success 'snapshot: short branch name (main)' '
+	gitweb_run "p=.git;a=snapshot;h=main;sf=tar" &&
+	ID=$(git rev-parse --verify --short=7 main) &&
+	check_snapshot ".git-main-$ID"
 '
 test_debug 'cat gitweb.headers && cat file_list'
 
@@ -93,10 +96,10 @@ test_expect_success 'snapshot: short tag name (first)' '
 '
 test_debug 'cat gitweb.headers && cat file_list'
 
-test_expect_success 'snapshot: full branch name (refs/heads/master)' '
-	gitweb_run "p=.git;a=snapshot;h=refs/heads/master;sf=tar" &&
-	ID=$(git rev-parse --verify --short=7 master) &&
-	check_snapshot ".git-master-$ID"
+test_expect_success 'snapshot: full branch name (refs/heads/main)' '
+	gitweb_run "p=.git;a=snapshot;h=refs/heads/main;sf=tar" &&
+	ID=$(git rev-parse --verify --short=7 main) &&
+	check_snapshot ".git-main-$ID"
 '
 test_debug 'cat gitweb.headers && cat file_list'
 
@@ -204,4 +207,31 @@ test_expect_success 'xss checks' '
 	xss "" "$TAG+"
 '
 
+no_http_equiv_content_type() {
+	gitweb_run "$@" &&
+	! grep -E "http-equiv=['\"]?content-type" gitweb.body
+}
+
+# See: <https://html.spec.whatwg.org/dev/semantics.html#attr-meta-http-equiv-content-type>
+test_expect_success 'no http-equiv="content-type" in XHTML' '
+	no_http_equiv_content_type &&
+	no_http_equiv_content_type "p=.git" &&
+	no_http_equiv_content_type "p=.git;a=log" &&
+	no_http_equiv_content_type "p=.git;a=tree"
+'
+
+proper_doctype() {
+	gitweb_run "$@" &&
+	grep -F "<!DOCTYPE html [" gitweb.body &&
+	grep "<!ENTITY nbsp" gitweb.body &&
+	grep "<!ENTITY sdot" gitweb.body
+}
+
+test_expect_success 'Proper DOCTYPE with entity declarations' '
+	proper_doctype &&
+	proper_doctype "p=.git" &&
+	proper_doctype "p=.git;a=log" &&
+	proper_doctype "p=.git;a=tree"
+'
+
 test_done
diff --git a/t/t9600-cvsimport.sh b/t/t9600-cvsimport.sh
index 251fdd6..5680849 100755
--- a/t/t9600-cvsimport.sh
+++ b/t/t9600-cvsimport.sh
@@ -1,6 +1,9 @@
 #!/bin/sh
 
 test_description='git cvsimport basic tests'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./lib-cvs.sh
 
 if ! test_have_prereq NOT_ROOT; then
@@ -159,6 +162,6 @@ test_expect_success PERL 'no .git/cvs-revisions created by default' '
 
 '
 
-test_expect_success PERL 'test entire HEAD' 'test_cmp_branch_tree master'
+test_expect_success PERL 'test entire HEAD' 'test_cmp_branch_tree main'
 
 test_done
diff --git a/t/t9601-cvsimport-vendor-branch.sh b/t/t9601-cvsimport-vendor-branch.sh
index 827d39f..116cddb 100755
--- a/t/t9601-cvsimport-vendor-branch.sh
+++ b/t/t9601-cvsimport-vendor-branch.sh
@@ -32,6 +32,9 @@
 #       tag has been removed.
 
 test_description='git cvsimport handling of vendor branches'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./lib-cvs.sh
 
 setup_cvs_test_repository t9601
@@ -42,43 +45,43 @@ test_expect_success PERL 'import a module with a vendor branch' '
 
 '
 
-test_expect_success PERL 'check HEAD out of cvs repository' 'test_cvs_co master'
+test_expect_success PERL 'check HEAD out of cvs repository' 'test_cvs_co main'
 
-test_expect_success PERL 'check master out of git repository' 'test_git_co master'
+test_expect_success PERL 'check main out of git repository' 'test_git_co main'
 
 test_expect_success PERL 'check a file that was imported once' '
 
-	test_cmp_branch_file master imported-once.txt
+	test_cmp_branch_file main imported-once.txt
 
 '
 
 test_expect_failure PERL 'check a file that was imported twice' '
 
-	test_cmp_branch_file master imported-twice.txt
+	test_cmp_branch_file main imported-twice.txt
 
 '
 
 test_expect_success PERL 'check a file that was imported then modified on HEAD' '
 
-	test_cmp_branch_file master imported-modified.txt
+	test_cmp_branch_file main imported-modified.txt
 
 '
 
 test_expect_success PERL 'check a file that was imported, modified, then imported again' '
 
-	test_cmp_branch_file master imported-modified-imported.txt
+	test_cmp_branch_file main imported-modified-imported.txt
 
 '
 
 test_expect_success PERL 'check a file that was added to HEAD then imported' '
 
-	test_cmp_branch_file master added-imported.txt
+	test_cmp_branch_file main added-imported.txt
 
 '
 
 test_expect_success PERL 'a vendor branch whose tag has been removed' '
 
-	test_cmp_branch_file master imported-anonymously.txt
+	test_cmp_branch_file main imported-anonymously.txt
 
 '
 
diff --git a/t/t9602-cvsimport-branches-tags.sh b/t/t9602-cvsimport-branches-tags.sh
index e1db323..e5266c9 100755
--- a/t/t9602-cvsimport-branches-tags.sh
+++ b/t/t9602-cvsimport-branches-tags.sh
@@ -4,6 +4,9 @@
 # t9602/README.
 
 test_description='git cvsimport handling of branches and tags'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./lib-cvs.sh
 
 setup_cvs_test_repository t9602
@@ -14,9 +17,9 @@ test_expect_success PERL 'import module' '
 
 '
 
-test_expect_success PERL 'test branch master' '
+test_expect_success PERL 'test branch main' '
 
-	test_cmp_branch_tree master
+	test_cmp_branch_tree main
 
 '
 
diff --git a/t/t9603-cvsimport-patchsets.sh b/t/t9603-cvsimport-patchsets.sh
index 3e64b11..19f38f7 100755
--- a/t/t9603-cvsimport-patchsets.sh
+++ b/t/t9603-cvsimport-patchsets.sh
@@ -17,23 +17,23 @@ test_description='git cvsimport testing for correct patchset estimation'
 setup_cvs_test_repository t9603
 
 test_expect_failure PERL 'import with criss cross times on revisions' '
-
-    git cvsimport -p"-x" -C module-git module &&
-    (cd module-git &&
-        git log --pretty=format:%s > ../actual-master &&
-        git log A~2..A --pretty="format:%s %ad" -- > ../actual-A &&
-        echo "" >> ../actual-master &&
-	echo "" >> ../actual-A
-    ) &&
-    echo "Rev 4
+	git cvsimport -p"-x" -C module-git module &&
+	(
+		cd module-git &&
+		git log --pretty=format:%s > ../actual-main &&
+		git log A~2..A --pretty="format:%s %ad" -- > ../actual-A &&
+		echo "" >> ../actual-main &&
+		echo "" >> ../actual-A
+	) &&
+	echo "Rev 4
 Rev 3
 Rev 2
-Rev 1" > expect-master &&
-    test_cmp expect-master actual-master &&
+Rev 1" > expect-main &&
+	test_cmp expect-main actual-main &&
 
-    echo "Rev 5 Branch A Wed Mar 11 19:09:10 2009 +0000
+	echo "Rev 5 Branch A Wed Mar 11 19:09:10 2009 +0000
 Rev 4 Branch A Wed Mar 11 19:03:52 2009 +0000" > expect-A &&
-    test_cmp expect-A actual-A
+	test_cmp expect-A actual-A
 '
 
 test_done
diff --git a/t/t9700-perl-git.sh b/t/t9700-perl-git.sh
index 102c133..ccc8212 100755
--- a/t/t9700-perl-git.sh
+++ b/t/t9700-perl-git.sh
@@ -4,57 +4,53 @@
 #
 
 test_description='perl interface (Git.pm)'
-. ./test-lib.sh
 
-if ! test_have_prereq PERL; then
-	skip_all='skipping perl interface tests, perl not available'
-	test_done
-fi
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-perl.sh
 
-perl -MTest::More -e 0 2>/dev/null || {
-	skip_all="Perl Test::More unavailable, skipping test"
-	test_done
-}
+skip_all_if_no_Test_More
 
 # set up test repository
 
-test_expect_success \
-    'set up test repository' \
-    'echo "test file 1" > file1 &&
-     echo "test file 2" > file2 &&
-     mkdir directory1 &&
-     echo "in directory1" >> directory1/file &&
-     mkdir directory2 &&
-     echo "in directory2" >> directory2/file &&
-     git add . &&
-     git commit -m "first commit" &&
-
-     echo "new file in subdir 2" > directory2/file2 &&
-     git add . &&
-     git commit -m "commit in directory2" &&
-
-     echo "changed file 1" > file1 &&
-     git commit -a -m "second commit" &&
-
-     git config --add color.test.slot1 green &&
-     git config --add test.string value &&
-     git config --add test.dupstring value1 &&
-     git config --add test.dupstring value2 &&
-     git config --add test.booltrue true &&
-     git config --add test.boolfalse no &&
-     git config --add test.boolother other &&
-     git config --add test.int 2k &&
-     git config --add test.path "~/foo" &&
-     git config --add test.pathexpanded "$HOME/foo" &&
-     git config --add test.pathmulti foo &&
-     git config --add test.pathmulti bar
-     '
-
-# The external test will outputs its own plan
-test_external_has_tap=1
-
-test_external_without_stderr \
-    'Perl API' \
-    perl "$TEST_DIRECTORY"/t9700/test.pl
+test_expect_success 'set up test repository' '
+	echo "test file 1" >file1 &&
+	echo "test file 2" >file2 &&
+	mkdir directory1 &&
+	echo "in directory1" >>directory1/file &&
+	mkdir directory2 &&
+	echo "in directory2" >>directory2/file &&
+	git add . &&
+	git commit -m "first commit" &&
+
+	echo "new file in subdir 2" >directory2/file2 &&
+	git add . &&
+	git commit -m "commit in directory2" &&
+
+	echo "changed file 1" >file1 &&
+	git commit -a -m "second commit" &&
+
+	git config --add color.test.slot1 green &&
+	git config --add test.string value &&
+	git config --add test.dupstring value1 &&
+	git config --add test.dupstring value2 &&
+	git config --add test.booltrue true &&
+	git config --add test.boolfalse no &&
+	git config --add test.boolother other &&
+	git config --add test.int 2k &&
+	git config --add test.path "~/foo" &&
+	git config --add test.pathexpanded "$HOME/foo" &&
+	git config --add test.pathmulti foo &&
+	git config --add test.pathmulti bar
+'
+
+test_expect_success 'set up bare repository' '
+	git init --bare bare.git
+'
+
+test_expect_success 'use t9700/test.pl to test Git.pm' '
+	"$PERL_PATH" "$TEST_DIRECTORY"/t9700/test.pl 2>stderr &&
+	test_must_be_empty stderr
+'
 
 test_done
diff --git a/t/t9700/test.pl b/t/t9700/test.pl
index e046f7d..d8e8548 100755
--- a/t/t9700/test.pl
+++ b/t/t9700/test.pl
@@ -1,7 +1,7 @@
 #!/usr/bin/perl
 use lib (split(/:/, $ENV{GITPERLLIB}));
 
-use 5.008;
+use 5.008001;
 use warnings;
 use strict;
 
@@ -30,6 +30,18 @@ BEGIN { use_ok('Git') }
 # set up
 our $abs_repo_dir = cwd();
 ok(our $r = Git->repository(Directory => "."), "open repository");
+{
+	local $ENV{GIT_TEST_ASSUME_DIFFERENT_OWNER} = 1;
+	my $failed;
+
+	$failed = eval { Git->repository(Directory => $abs_repo_dir) };
+	ok(!$failed, "reject unsafe non-bare repository");
+	like($@, qr/not a git repository/i, "unsafe error message");
+
+	$failed = eval { Git->repository(Directory => "$abs_repo_dir/bare.git") };
+	ok(!$failed, "reject unsafe bare repository");
+	like($@, qr/not a git repository/i, "unsafe error message");
+}
 
 # config
 is($r->config("test.string"), "value", "config scalar: string");
diff --git a/t/t9800-git-p4-basic.sh b/t/t9800-git-p4-basic.sh
index c98c1df..53af8e3 100755
--- a/t/t9800-git-p4-basic.sh
+++ b/t/t9800-git-p4-basic.sh
@@ -2,6 +2,9 @@
 
 test_description='git p4 tests'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./lib-git-p4.sh
 
 test_expect_success 'start p4d' '
@@ -51,7 +54,7 @@ test_expect_success 'git p4 sync uninitialized repo' '
 	(
 		cd "$git" &&
 		test_must_fail git p4 sync 2>errs &&
-		test_i18ngrep "Perhaps you never did" errs
+		test_grep "Perhaps you never did" errs
 	)
 '
 
@@ -71,6 +74,91 @@ test_expect_success 'git p4 sync new branch' '
 	)
 '
 
+#
+# Setup as before, and then explicitly sync imported branch, using a
+# different ref format.
+#
+test_expect_success 'git p4 sync existing branch without changes' '
+	test_create_repo "$git" &&
+	test_when_finished cleanup_git &&
+	(
+		cd "$git" &&
+		test_commit head &&
+		git p4 sync --branch=depot //depot@all &&
+		git p4 sync --branch=refs/remotes/p4/depot >out &&
+		test_grep "No changes to import!" out
+	)
+'
+
+#
+# Same as before, relative branch name.
+#
+test_expect_success 'git p4 sync existing branch with relative name' '
+	test_create_repo "$git" &&
+	test_when_finished cleanup_git &&
+	(
+		cd "$git" &&
+		test_commit head &&
+		git p4 sync --branch=branch1 //depot@all &&
+		git p4 sync --branch=p4/branch1 >out &&
+		test_grep "No changes to import!" out
+	)
+'
+
+#
+# Same as before, with a nested branch path, referenced different ways.
+#
+test_expect_success 'git p4 sync existing branch with nested path' '
+	test_create_repo "$git" &&
+	test_when_finished cleanup_git &&
+	(
+		cd "$git" &&
+		test_commit head &&
+		git p4 sync --branch=p4/some/path //depot@all &&
+		git p4 sync --branch=some/path >out &&
+		test_grep "No changes to import!" out
+	)
+'
+
+#
+# Same as before, with a full ref path outside the p4/* namespace.
+#
+test_expect_success 'git p4 sync branch explicit ref without p4 in path' '
+	test_create_repo "$git" &&
+	test_when_finished cleanup_git &&
+	(
+		cd "$git" &&
+		test_commit head &&
+		git p4 sync --branch=refs/remotes/someremote/depot //depot@all &&
+		git p4 sync --branch=refs/remotes/someremote/depot >out &&
+		test_grep "No changes to import!" out
+	)
+'
+
+test_expect_success 'git p4 sync nonexistent ref' '
+	test_create_repo "$git" &&
+	test_when_finished cleanup_git &&
+	(
+		cd "$git" &&
+		test_commit head &&
+		git p4 sync --branch=depot //depot@all &&
+		test_must_fail git p4 sync --branch=depot2 2>errs &&
+		test_grep "Perhaps you never did" errs
+	)
+'
+
+test_expect_success 'git p4 sync existing non-p4-imported ref' '
+	test_create_repo "$git" &&
+	test_when_finished cleanup_git &&
+	(
+		cd "$git" &&
+		test_commit head &&
+		git p4 sync --branch=depot //depot@all &&
+		test_must_fail git p4 sync --branch=refs/heads/master 2>errs &&
+		test_grep "Perhaps you never did" errs
+	)
+'
+
 test_expect_success 'clone two dirs' '
 	(
 		cd "$cli" &&
@@ -168,7 +256,7 @@ test_expect_success 'clone using non-numeric revision ranges' '
 			cd "$git" &&
 			git ls-files >lines &&
 			test_line_count = 8 lines
-		)
+		) || return 1
 	done
 '
 
@@ -202,7 +290,7 @@ test_expect_success 'exit when p4 fails to produce marshaled output' '
 		export PATH &&
 		test_expect_code 1 git p4 clone --dest="$git" //depot >errs 2>&1
 	) &&
-	test_i18ngrep ! Traceback errs
+	test_grep ! Traceback errs
 '
 
 # Hide a file from p4d, make sure we catch its complaint.  This won't fail in
@@ -213,7 +301,7 @@ test_expect_success 'exit gracefully for p4 server errors' '
 	mv "$db"/depot/file1,v "$db"/depot/file1,v,hidden &&
 	test_when_finished cleanup_git &&
 	test_expect_code 1 git p4 clone --dest="$git" //depot@1 >out 2>err &&
-	test_i18ngrep "Error from p4 print" err
+	test_grep "Error from p4 print" err
 '
 
 test_expect_success 'clone --bare should make a bare repository' '
@@ -226,7 +314,7 @@ test_expect_success 'clone --bare should make a bare repository' '
 		git config --get --bool core.bare true &&
 		git rev-parse --verify refs/remotes/p4/master &&
 		git rev-parse --verify refs/remotes/p4/HEAD &&
-		git rev-parse --verify refs/heads/master &&
+		git rev-parse --verify refs/heads/main &&
 		git rev-parse --verify HEAD
 	)
 '
@@ -242,7 +330,7 @@ test_expect_success 'initial import time from top change time' '
 	test_when_finished cleanup_git &&
 	(
 		cd "$git" &&
-		gittime=$(git show -s --raw --pretty=format:%at HEAD) &&
+		gittime=$(git show -s --pretty=format:%at HEAD) &&
 		echo $p4time $gittime &&
 		test $p4time = $gittime
 	)
@@ -274,16 +362,21 @@ test_expect_success 'run hook p4-pre-submit before submit' '
 		git commit -m "add hello.txt" &&
 		git config git-p4.skipSubmitEdit true &&
 		git p4 submit --dry-run >out &&
-		grep "Would apply" out &&
-		mkdir -p .git/hooks &&
-		write_script .git/hooks/p4-pre-submit <<-\EOF &&
-		exit 0
-		EOF
+		grep "Would apply" out
+	) &&
+	test_hook -C "$git" p4-pre-submit <<-\EOF &&
+	exit 0
+	EOF
+	(
+		cd "$git" &&
 		git p4 submit --dry-run >out &&
-		grep "Would apply" out &&
-		write_script .git/hooks/p4-pre-submit <<-\EOF &&
-		exit 1
-		EOF
+		grep "Would apply" out
+	) &&
+	test_hook -C "$git" --clobber p4-pre-submit <<-\EOF &&
+	exit 1
+	EOF
+	(
+		cd "$git" &&
 		test_must_fail git p4 submit --dry-run >errs 2>&1 &&
 		! grep "Would apply" errs
 	)
diff --git a/t/t9801-git-p4-branch.sh b/t/t9801-git-p4-branch.sh
index 67ff271..c598011 100755
--- a/t/t9801-git-p4-branch.sh
+++ b/t/t9801-git-p4-branch.sh
@@ -2,6 +2,9 @@
 
 test_description='git p4 tests for p4 branches'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./lib-git-p4.sh
 
 test_expect_success 'start p4d' '
@@ -67,7 +70,7 @@ test_expect_success 'import main, no branch detection' '
 	(
 		cd "$git" &&
 		git log --oneline --graph --decorate --all &&
-		git rev-list master >wc &&
+		git rev-list main -- >wc &&
 		test_line_count = 4 wc
 	)
 '
@@ -78,7 +81,7 @@ test_expect_success 'import branch1, no branch detection' '
 	(
 		cd "$git" &&
 		git log --oneline --graph --decorate --all &&
-		git rev-list master >wc &&
+		git rev-list main -- >wc &&
 		test_line_count = 2 wc
 	)
 '
@@ -89,7 +92,7 @@ test_expect_success 'import branch2, no branch detection' '
 	(
 		cd "$git" &&
 		git log --oneline --graph --decorate --all &&
-		git rev-list master >wc &&
+		git rev-list main -- >wc &&
 		test_line_count = 2 wc
 	)
 '
@@ -100,7 +103,7 @@ test_expect_success 'import depot, no branch detection' '
 	(
 		cd "$git" &&
 		git log --oneline --graph --decorate --all &&
-		git rev-list master >wc &&
+		git rev-list main -- >wc &&
 		test_line_count = 8 wc
 	)
 '
@@ -114,7 +117,7 @@ test_expect_success 'import depot, branch detection' '
 		git log --oneline --graph --decorate --all &&
 
 		# 4 main commits
-		git rev-list master >wc &&
+		git rev-list main -- >wc &&
 		test_line_count = 4 wc &&
 
 		# 3 main, 1 integrate, 1 on branch2
@@ -126,6 +129,16 @@ test_expect_success 'import depot, branch detection' '
 	)
 '
 
+test_expect_success 'sync specific detected branch' '
+	test_when_finished cleanup_git &&
+	git p4 clone --dest="$git" --detect-branches //depot@all &&
+	(
+		cd "$git" &&
+		git p4 sync --branch=depot/branch2 >out &&
+		test_grep "No changes to import!" out
+	)
+'
+
 test_expect_success 'import depot, branch detection, branchList branch definition' '
 	test_when_finished cleanup_git &&
 	test_create_repo "$git" &&
@@ -137,7 +150,7 @@ test_expect_success 'import depot, branch detection, branchList branch definitio
 		git log --oneline --graph --decorate --all &&
 
 		# 4 main commits
-		git rev-list master >wc &&
+		git rev-list main -- >wc &&
 		test_line_count = 4 wc &&
 
 		# 3 main, 1 integrate, 1 on branch2
@@ -200,19 +213,19 @@ test_expect_success 'git p4 clone simple branches' '
 		git p4 clone --dest=. --detect-branches //depot@all &&
 		git log --all --graph --decorate --stat &&
 		git reset --hard p4/depot/branch1 &&
-		test -f file1 &&
-		test -f file2 &&
-		test -f file3 &&
+		test_path_is_file file1 &&
+		test_path_is_file file2 &&
+		test_path_is_file file3 &&
 		grep update file2 &&
 		git reset --hard p4/depot/branch2 &&
-		test -f file1 &&
-		test -f file2 &&
+		test_path_is_file file1 &&
+		test_path_is_file file2 &&
 		test ! -f file3 &&
 		! grep update file2 &&
 		git reset --hard p4/depot/branch3 &&
-		test -f file1 &&
-		test -f file2 &&
-		test -f file3 &&
+		test_path_is_file file1 &&
+		test_path_is_file file2 &&
+		test_path_is_file file3 &&
 		grep update file2 &&
 		cd "$cli" &&
 		cd branch1 &&
@@ -291,11 +304,13 @@ test_expect_success 'git p4 clone complex branches' '
 		test_path_is_file file3 &&
 		grep update file2 &&
 		git reset --hard p4/depot/branch4 &&
+		git diff-tree --quiet HEAD &&
 		test_path_is_file file1 &&
 		test_path_is_file file2 &&
 		test_path_is_missing file3 &&
 		! grep update file2 &&
 		git reset --hard p4/depot/branch5 &&
+		git diff-tree --quiet HEAD &&
 		test_path_is_file file1 &&
 		test_path_is_file file2 &&
 		test_path_is_file file3 &&
@@ -451,7 +466,7 @@ test_expect_success 'git p4 clone complex branches with excluded files' '
 	)
 '
 
-# From a report in http://stackoverflow.com/questions/11893688
+# From a report in https://stackoverflow.com/questions/11893688
 # where --use-client-spec caused branch prefixes not to be removed;
 # every file in git appeared into a subdirectory of the branch name.
 test_expect_success 'use-client-spec detect-branches setup' '
@@ -484,7 +499,7 @@ test_expect_success 'use-client-spec detect-branches files in top-level' '
 	(
 		cd "$git" &&
 		git p4 sync --detect-branches --use-client-spec //depot/usecs@all &&
-		git checkout -b master p4/usecs/b1 &&
+		git checkout -b main p4/usecs/b1 &&
 		test_path_is_file b1-file1 &&
 		test_path_is_missing b2-file2 &&
 		test_path_is_missing b1 &&
@@ -537,7 +552,7 @@ test_expect_success 'use-client-spec detect-branches skips files in branches' '
 	(
 		cd "$git" &&
 		git p4 sync --detect-branches --use-client-spec //depot/usecs@all &&
-		git checkout -b master p4/usecs/b3 &&
+		git checkout -b main p4/usecs/b3 &&
 		test_path_is_file b1-file1 &&
 		test_path_is_file b3-file3_2 &&
 		test_path_is_missing b3-file3_1
@@ -603,22 +618,22 @@ test_expect_success 'git p4 clone simple branches with base folder on server sid
 		git p4 clone --dest=. --use-client-spec  --detect-branches //depot@all &&
 		git log --all --graph --decorate --stat &&
 		git reset --hard p4/depot/branch1 &&
-		test -f file1 &&
-		test -f file2 &&
-		test -f file3 &&
-		test -f sub_file1 &&
+		test_path_is_file file1 &&
+		test_path_is_file file2 &&
+		test_path_is_file file3 &&
+		test_path_is_file sub_file1 &&
 		grep update file2 &&
 		git reset --hard p4/depot/branch2 &&
-		test -f file1 &&
-		test -f file2 &&
+		test_path_is_file file1 &&
+		test_path_is_file file2 &&
 		test ! -f file3 &&
-		test -f sub_file1 &&
+		test_path_is_file sub_file1 &&
 		! grep update file2 &&
 		git reset --hard p4/depot/branch3 &&
-		test -f file1 &&
-		test -f file2 &&
-		test -f file3 &&
-		test -f sub_file1 &&
+		test_path_is_file file1 &&
+		test_path_is_file file2 &&
+		test_path_is_file file3 &&
+		test_path_is_file sub_file1 &&
 		grep update file2 &&
 		cd "$cli" &&
 		cd branch1 &&
diff --git a/t/t9802-git-p4-filetype.sh b/t/t9802-git-p4-filetype.sh
index 94edebe..bb236cd 100755
--- a/t/t9802-git-p4-filetype.sh
+++ b/t/t9802-git-p4-filetype.sh
@@ -175,7 +175,7 @@ test_expect_success 'keyword file create' '
 		cp k-text-k k-text-ko &&
 		p4 add -t text+ko k-text-ko &&
 
-		cat k-text-k | iconv -f ascii -t utf-16 >k-utf16-k &&
+		iconv -f ascii -t utf-16 <k-text-k >k-utf16-k &&
 		p4 add -t utf16+k k-utf16-k &&
 
 		cp k-utf16-k k-utf16-ko &&
@@ -263,7 +263,7 @@ test_expect_success SYMLINKS 'ensure p4 symlink parsed correctly' '
 	(
 		cd "$git" &&
 		test -L symlink &&
-		test $(readlink symlink) = symlink-target
+		test $(test_readlink symlink) = symlink-target
 	)
 '
 
@@ -329,7 +329,41 @@ test_expect_success SYMLINKS 'empty symlink target' '
 	git p4 clone --dest="$git" //depot@all &&
 	(
 		cd "$git" &&
-		test $(readlink empty-symlink) = target2
+		test $(test_readlink empty-symlink) = target2
+	)
+'
+
+test_expect_success SYMLINKS 'utf-8 with and without BOM in text file' '
+	(
+		cd "$cli" &&
+
+		# some utf8 content
+		echo some tǣxt >utf8-nobom-test &&
+
+		# same utf8 content as before but with bom
+		echo some tǣxt | sed '\''s/^/\xef\xbb\xbf/'\'' >utf8-bom-test &&
+
+		# bom only
+		dd bs=1 count=3 if=utf8-bom-test of=utf8-bom-empty-test &&
+
+		p4 add utf8-nobom-test utf8-bom-test utf8-bom-empty-test &&
+		p4 submit -d "add utf8 test files"
+	) &&
+	test_when_finished cleanup_git &&
+
+	git p4 clone --dest="$git" //depot@all &&
+	(
+		cd "$git" &&
+		git checkout refs/remotes/p4/master &&
+
+		echo some tǣxt >utf8-nobom-check &&
+		test_cmp utf8-nobom-check utf8-nobom-test &&
+
+		echo some tǣxt | sed '\''s/^/\xef\xbb\xbf/'\'' >utf8-bom-check &&
+		test_cmp utf8-bom-check utf8-bom-test &&
+
+		dd bs=1 count=3 if=utf8-bom-check of=utf8-bom-empty-check &&
+		test_cmp utf8-bom-empty-check utf8-bom-empty-test
 	)
 '
 
diff --git a/t/t9806-git-p4-options.sh b/t/t9806-git-p4-options.sh
index 4e794a0..c26d297 100755
--- a/t/t9806-git-p4-options.sh
+++ b/t/t9806-git-p4-options.sh
@@ -2,6 +2,9 @@
 
 test_description='git p4 options'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./lib-git-p4.sh
 
 test_expect_success 'start p4d' '
@@ -27,14 +30,14 @@ test_expect_success 'clone no --git-dir' '
 	test_must_fail git p4 clone --git-dir=xx //depot
 '
 
-test_expect_success 'clone --branch should checkout master' '
+test_expect_success 'clone --branch should checkout main' '
 	git p4 clone --branch=refs/remotes/p4/sb --dest="$git" //depot &&
 	test_when_finished cleanup_git &&
 	(
 		cd "$git" &&
 		git rev-parse refs/remotes/p4/sb >sb &&
-		git rev-parse refs/heads/master >master &&
-		test_cmp sb master &&
+		git rev-parse refs/heads/main >main &&
+		test_cmp sb main &&
 		git rev-parse HEAD >head &&
 		test_cmp sb head
 	)
@@ -147,22 +150,22 @@ test_expect_success 'clone --changesfile, @all' '
 	test_must_fail git p4 clone --changesfile="$TRASH_DIRECTORY/cf" --dest="$git" //depot@all
 '
 
-# imports both master and p4/master in refs/heads
+# imports both main and p4/master in refs/heads
 # requires --import-local on sync to find p4 refs/heads
-# does not update master on sync, just p4/master
+# does not update main on sync, just p4/master
 test_expect_success 'clone/sync --import-local' '
 	git p4 clone --import-local --dest="$git" //depot@1,2 &&
 	test_when_finished cleanup_git &&
 	(
 		cd "$git" &&
-		git log --oneline refs/heads/master >lines &&
+		git log --oneline refs/heads/main >lines &&
 		test_line_count = 2 lines &&
 		git log --oneline refs/heads/p4/master >lines &&
 		test_line_count = 2 lines &&
 		test_must_fail git p4 sync &&
 
 		git p4 sync --import-local &&
-		git log --oneline refs/heads/master >lines &&
+		git log --oneline refs/heads/main >lines &&
 		test_line_count = 2 lines &&
 		git log --oneline refs/heads/p4/master >lines &&
 		test_line_count = 3 lines
@@ -174,7 +177,7 @@ test_expect_success 'clone --max-changes' '
 	test_when_finished cleanup_git &&
 	(
 		cd "$git" &&
-		git log --oneline refs/heads/master >lines &&
+		git log --oneline refs/heads/main >lines &&
 		test_line_count = 2 lines
 	)
 '
@@ -237,7 +240,7 @@ test_expect_success 'clone --use-client-spec' '
 			git init &&
 			git config git-p4.useClientSpec true &&
 			git p4 sync //depot/... &&
-			git checkout -b master p4/master &&
+			git checkout -b main p4/master &&
 			test_path_is_file bus/dir/f4 &&
 			test_path_is_missing file1
 		)
diff --git a/t/t9807-git-p4-submit.sh b/t/t9807-git-p4-submit.sh
index eaaae41..6ae7ced 100755
--- a/t/t9807-git-p4-submit.sh
+++ b/t/t9807-git-p4-submit.sh
@@ -2,6 +2,9 @@
 
 test_description='git p4 submit'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./lib-git-p4.sh
 
 test_expect_success 'start p4d' '
@@ -72,7 +75,7 @@ test_expect_success 'submit --dry-run' '
 		test_commit "dry-run1" &&
 		test_commit "dry-run2" &&
 		git p4 submit --dry-run >out &&
-		test_i18ngrep "Would apply" out
+		test_grep "Would apply" out
 	) &&
 	(
 		cd "$cli" &&
@@ -96,7 +99,7 @@ test_expect_success 'submit --dry-run --export-labels' '
 		git commit -m "dry-run2" dry-run2 &&
 		git tag -m "dry-run-tag1" dry-run-tag1 HEAD^ &&
 		git p4 submit --dry-run --export-labels >out &&
-		test_i18ngrep "Would create p4 label" out
+		test_grep "Would create p4 label" out
 	) &&
 	(
 		cd "$cli" &&
@@ -114,7 +117,7 @@ test_expect_success 'submit with allowSubmit' '
 		git config git-p4.skipSubmitEdit true &&
 		git config git-p4.allowSubmit "nobranch" &&
 		test_must_fail git p4 submit &&
-		git config git-p4.allowSubmit "nobranch,master" &&
+		git config git-p4.allowSubmit "nobranch,main" &&
 		git p4 submit
 	)
 '
@@ -415,7 +418,7 @@ test_expect_success 'description with Jobs and values on separate lines' '
 			marshal_dump job0 <change &&
 			marshal_dump job1 <change
 		) | sort >jobs &&
-		cat jobname1 jobname2 | sort >expected &&
+		sort jobname1 jobname2 >expected &&
 		test_cmp expected jobs
 	)
 '
@@ -440,7 +443,7 @@ test_expect_success 'description with Jobs section and bogus following text' '
 		# build a job
 		make_job $(cat jobname) &&
 		test_must_fail git p4 submit 2>err &&
-		test_i18ngrep "Unknown field name" err
+		test_grep "Unknown field name" err
 	) &&
 	(
 		cd "$cli" &&
@@ -458,9 +461,9 @@ test_expect_success 'submit --prepare-p4-only' '
 		git add prep-only-add &&
 		git commit -m "prep only add" &&
 		git p4 submit --prepare-p4-only >out &&
-		test_i18ngrep "prepared for submission" out &&
-		test_i18ngrep "must be deleted" out &&
-		test_i18ngrep ! "everything below this line is just the diff" out
+		test_grep "prepared for submission" out &&
+		test_grep "must be deleted" out &&
+		test_grep ! "everything below this line is just the diff" out
 	) &&
 	(
 		cd "$cli" &&
diff --git a/t/t9810-git-p4-rcs.sh b/t/t9810-git-p4-rcs.sh
index e383688..5fe8331 100755
--- a/t/t9810-git-p4-rcs.sh
+++ b/t/t9810-git-p4-rcs.sh
@@ -4,6 +4,8 @@ test_description='git p4 rcs keywords'
 
 . ./lib-git-p4.sh
 
+CP1252="\223\224"
+
 test_expect_success 'start p4d' '
 	start_p4d
 '
@@ -32,6 +34,9 @@ test_expect_success 'init depot' '
 		p4 submit -d "filek" &&
 		p4 add -t text+ko fileko &&
 		p4 submit -d "fileko" &&
+		printf "$CP1252" >fileko_cp1252 &&
+		p4 add -t text+ko fileko_cp1252 &&
+		p4 submit -d "fileko_cp1252" &&
 		p4 add -t text file_text &&
 		p4 submit -d "file_text"
 	)
@@ -359,4 +364,14 @@ test_expect_failure 'Add keywords in git which do not match the default p4 value
 	)
 '
 
+test_expect_success 'check cp1252 smart quote are preserved through RCS keyword processing' '
+	test_when_finished cleanup_git &&
+	git p4 clone --dest="$git" //depot &&
+	(
+		cd "$git" &&
+		printf "$CP1252" >expect &&
+		test_cmp_bin expect fileko_cp1252
+	)
+'
+
 test_done
diff --git a/t/t9811-git-p4-label-import.sh b/t/t9811-git-p4-label-import.sh
index c1446f2..5ac5383 100755
--- a/t/t9811-git-p4-label-import.sh
+++ b/t/t9811-git-p4-label-import.sh
@@ -2,6 +2,9 @@
 
 test_description='git p4 label tests'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./lib-git-p4.sh
 
 test_expect_success 'start p4d' '
@@ -185,7 +188,7 @@ test_expect_success 'tag that cannot be exported' '
 		git add main/f12 &&
 		git commit -m "adding f12" &&
 		git tag -m "tag on a_branch" GIT_TAG_ON_A_BRANCH &&
-		git checkout master &&
+		git checkout main &&
 		git p4 submit --export-labels
 	) &&
 	(
diff --git a/t/t9814-git-p4-rename.sh b/t/t9814-git-p4-rename.sh
index 468767c..2a9838f 100755
--- a/t/t9814-git-p4-rename.sh
+++ b/t/t9814-git-p4-rename.sh
@@ -216,7 +216,7 @@ test_expect_success 'detect copies' '
 # variable exists, which allows admins to disable the "p4 move" command.
 test_lazy_prereq P4D_HAVE_CONFIGURABLE_RUN_MOVE_ALLOW '
 	p4 configure show run.move.allow >out &&
-	egrep ^run.move.allow: out
+	grep -E ^run.move.allow: out
 '
 
 # If move can be disabled, turn it off and test p4 move handling
diff --git a/t/t9815-git-p4-submit-fail.sh b/t/t9815-git-p4-submit-fail.sh
index 9779dc0..c766fd1 100755
--- a/t/t9815-git-p4-submit-fail.sh
+++ b/t/t9815-git-p4-submit-fail.sh
@@ -35,7 +35,7 @@ test_expect_success 'conflict on one commit' '
 		git add file1 &&
 		git commit -m "line3 in file1 will conflict" &&
 		test_expect_code 1 git p4 submit >out &&
-		test_i18ngrep "No commits applied" out
+		test_grep "No commits applied" out
 	)
 '
 
@@ -58,7 +58,7 @@ test_expect_success 'conflict on second of two commits' '
 		git add file1 &&
 		git commit -m "line4 in file1 will conflict" &&
 		test_expect_code 1 git p4 submit >out &&
-		test_i18ngrep "Applied only the commits" out
+		test_grep "Applied only the commits" out
 	)
 '
 
@@ -81,7 +81,7 @@ test_expect_success 'conflict on first of two commits, skip' '
 		# but this commit is okay
 		test_commit "okay_commit_after_skip" &&
 		echo s | test_expect_code 1 git p4 submit >out &&
-		test_i18ngrep "Applied only the commits" out
+		test_grep "Applied only the commits" out
 	)
 '
 
@@ -104,7 +104,7 @@ test_expect_success 'conflict on first of two commits, quit' '
 		# but this commit is okay
 		test_commit "okay_commit_after_quit" &&
 		echo q | test_expect_code 1 git p4 submit >out &&
-		test_i18ngrep "No commits applied" out
+		test_grep "No commits applied" out
 	)
 '
 
@@ -144,7 +144,7 @@ test_expect_success 'conflict on first of two commits, --conflict=skip' '
 		# but this commit is okay
 		test_commit "okay_commit_after_auto_skip" &&
 		test_expect_code 1 git p4 submit --conflict=skip >out &&
-		test_i18ngrep "Applied only the commits" out
+		test_grep "Applied only the commits" out
 	)
 '
 
@@ -167,7 +167,7 @@ test_expect_success 'conflict on first of two commits, --conflict=quit' '
 		# but this commit is okay
 		test_commit "okay_commit_after_auto_quit" &&
 		test_expect_code 1 git p4 submit --conflict=quit >out &&
-		test_i18ngrep "No commits applied" out
+		test_grep "No commits applied" out
 	)
 '
 
@@ -417,8 +417,8 @@ test_expect_success 'cleanup chmod after submit cancel' '
 		! p4 fstat -T action text &&
 		test_path_is_file text+x &&
 		! p4 fstat -T action text+x &&
-		ls -l text | egrep ^-r-- &&
-		ls -l text+x | egrep ^-r-x
+		ls -l text | grep -E ^-r-- &&
+		ls -l text+x | grep -E ^-r-x
 	)
 '
 
diff --git a/t/t9816-git-p4-locked.sh b/t/t9816-git-p4-locked.sh
index 9328410..5e904ac 100755
--- a/t/t9816-git-p4-locked.sh
+++ b/t/t9816-git-p4-locked.sh
@@ -9,7 +9,7 @@ test_expect_success 'start p4d' '
 '
 
 # See
-# http://www.perforce.com/perforce/doc.current/manuals/p4sag/03_superuser.html#1088563
+# https://web.archive.org/web/20150602090517/http://www.perforce.com/perforce/doc.current/manuals/p4sag/chapter.superuser.html#superuser.basic.typemap_locking
 # for suggestions on how to configure "sitewide pessimistic locking"
 # where only one person can have a file open for edit at a time.
 test_expect_success 'init depot' '
diff --git a/t/t9818-git-p4-block.sh b/t/t9818-git-p4-block.sh
index 0db7ab9..de591d8 100755
--- a/t/t9818-git-p4-block.sh
+++ b/t/t9818-git-p4-block.sh
@@ -92,11 +92,11 @@ test_expect_success 'Add some more files' '
 	for i in $(test_seq 0 10)
 	do
 		p4_add_file "included/x$i" &&
-		p4_add_file "excluded/x$i"
+		p4_add_file "excluded/x$i" || return 1
 	done &&
 	for i in $(test_seq 0 10)
 	do
-		p4_add_file "excluded/y$i"
+		p4_add_file "excluded/y$i" || return 1
 	done
 '
 
@@ -123,7 +123,7 @@ test_expect_success 'Create a repo with multiple depot paths' '
 	do
 		for i in $(test_seq 1 10)
 		do
-			p4_add_file "$p/file$p$i"
+			p4_add_file "$p/file$p$i" || return 1
 		done
 	done
 '
diff --git a/t/t9824-git-p4-git-lfs.sh b/t/t9824-git-p4-git-lfs.sh
index a28dbbd..80c8c31 100755
--- a/t/t9824-git-p4-git-lfs.sh
+++ b/t/t9824-git-p4-git-lfs.sh
@@ -17,8 +17,8 @@ test_file_in_lfs () {
 	sed -n '2,2 p' "$FILE" | grep "^oid " &&
 	sed -n '3,3 p' "$FILE" | grep "^size " &&
 	test_line_count = 3 "$FILE" &&
-	cat "$FILE" | grep "size $SIZE" &&
-	HASH=$(cat "$FILE" | grep "oid sha256:" | sed -e "s/oid sha256://g") &&
+	grep "size $SIZE" "$FILE" &&
+	HASH=$(sed -ne "/oid sha256:/s/oid sha256://gp" "$FILE") &&
 	LFS_FILE=".git/lfs/objects/$(echo "$HASH" | cut -c1-2)/$(echo "$HASH" | cut -c3-4)/$HASH" &&
 	echo $EXPECTED_CONTENT >expect &&
 	test_path_is_file "$FILE" &&
diff --git a/t/t9832-unshelve.sh b/t/t9832-unshelve.sh
index e9276c4..6b3cb04 100755
--- a/t/t9832-unshelve.sh
+++ b/t/t9832-unshelve.sh
@@ -29,8 +29,11 @@ test_expect_success 'init depot' '
 	)
 '
 
+# Create an initial clone, with a commit unrelated to the P4 change
+# on HEAD
 test_expect_success 'initial clone' '
-	git p4 clone --dest="$git" //depot/@all
+	git p4 clone --dest="$git" //depot/@all &&
+    test_commit -C "$git" "unrelated"
 '
 
 test_expect_success 'create shelved changelist' '
@@ -65,7 +68,8 @@ EOF
 		cd "$git" &&
 		change=$(last_shelved_change) &&
 		git p4 unshelve $change &&
-		git show refs/remotes/p4-unshelved/$change | grep -q "Further description" &&
+		git show refs/remotes/p4-unshelved/$change >actual &&
+		grep -q "Further description" actual &&
 		git cherry-pick refs/remotes/p4-unshelved/$change &&
 		test_path_is_file file2 &&
 		test_cmp file1 "$cli"/file1 &&
diff --git a/t/t9835-git-p4-metadata-encoding-python2.sh b/t/t9835-git-p4-metadata-encoding-python2.sh
new file mode 100755
index 0000000..036bf79
--- /dev/null
+++ b/t/t9835-git-p4-metadata-encoding-python2.sh
@@ -0,0 +1,213 @@
+#!/bin/sh
+
+test_description='git p4 metadata encoding
+
+This test checks that the import process handles inconsistent text
+encoding in p4 metadata (author names, commit messages, etc) without
+failing, and produces maximally sane output in git.'
+
+. ./lib-git-p4.sh
+
+python_target_version='2'
+
+###############################
+## SECTION REPEATED IN t9836 ##
+###############################
+
+# Please note: this test calls "git-p4.py" rather than "git-p4", because the
+# latter references a specific path so we can't easily force it to run under
+# the python version we need to.
+
+python_major_version=$(python -V 2>&1 | cut -c  8)
+python_target_binary=$(which python$python_target_version)
+if ! test "$python_major_version" = "$python_target_version" && test "$python_target_binary"
+then
+	mkdir temp_python
+	PATH="$(pwd)/temp_python:$PATH" && export PATH
+	ln -s $python_target_binary temp_python/python
+fi
+
+python_major_version=$(python -V 2>&1 | cut -c  8)
+if ! test "$python_major_version" = "$python_target_version"
+then
+	skip_all="skipping python$python_target_version-specific git p4 tests; python$python_target_version not available"
+	test_done
+fi
+
+remove_user_cache () {
+	rm "$HOME/.gitp4-usercache.txt" || true
+}
+
+test_expect_success 'start p4d' '
+	start_p4d
+'
+
+test_expect_success 'init depot' '
+	(
+		cd "$cli" &&
+
+		p4_add_user "utf8_author" "ǣuthor" &&
+		P4USER=utf8_author &&
+		touch file1 &&
+		p4 add file1 &&
+		p4 submit -d "first CL has some utf-8 tǣxt" &&
+
+		p4_add_user "latin1_author" "$(echo æuthor |
+			iconv -f utf8 -t latin1)" &&
+		P4USER=latin1_author &&
+		touch file2 &&
+		p4 add file2 &&
+		p4 submit -d "$(echo second CL has some latin-1 tæxt |
+			iconv -f utf8 -t latin1)" &&
+
+		p4_add_user "cp1252_author" "$(echo æuthœr |
+			iconv -f utf8 -t cp1252)" &&
+		P4USER=cp1252_author &&
+		touch file3 &&
+		p4 add file3 &&
+		p4 submit -d "$(echo third CL has sœme cp-1252 tæxt |
+		  iconv -f utf8 -t cp1252)" &&
+
+		p4_add_user "cp850_author" "$(echo Åuthor |
+			iconv -f utf8 -t cp850)" &&
+		P4USER=cp850_author &&
+		touch file4 &&
+		p4 add file4 &&
+		p4 submit -d "$(echo fourth CL hÅs some cp850 text |
+			iconv -f utf8 -t cp850)"
+	)
+'
+
+test_expect_success 'clone non-utf8 repo with strict encoding' '
+	test_when_finished cleanup_git &&
+	test_when_finished remove_user_cache &&
+	test_must_fail git -c git-p4.metadataDecodingStrategy=strict p4.py clone --dest="$git" //depot@all 2>err &&
+	grep "Decoding perforce metadata failed!" err
+'
+
+test_expect_success 'check utf-8 contents with passthrough strategy' '
+	test_when_finished cleanup_git &&
+	test_when_finished remove_user_cache &&
+	git -c git-p4.metadataDecodingStrategy=passthrough p4.py clone --dest="$git" //depot@all &&
+	(
+		cd "$git" &&
+		git log >actual &&
+		grep "some utf-8 tǣxt" actual &&
+		grep "ǣuthor" actual
+	)
+'
+
+test_expect_success 'check latin-1 contents corrupted in git with passthrough strategy' '
+	test_when_finished cleanup_git &&
+	test_when_finished remove_user_cache &&
+	git -c git-p4.metadataDecodingStrategy=passthrough p4.py clone --dest="$git" //depot@all &&
+	(
+		cd "$git" &&
+		git log >actual &&
+		badly_encoded_in_git=$(echo "some latin-1 tæxt" | iconv -f utf8 -t latin1) &&
+		grep "$badly_encoded_in_git" actual &&
+		bad_author_in_git="$(echo æuthor | iconv -f utf8 -t latin1)" &&
+		grep "$bad_author_in_git" actual
+	)
+'
+
+test_expect_success 'check utf-8 contents with fallback strategy' '
+	test_when_finished cleanup_git &&
+	test_when_finished remove_user_cache &&
+	git -c git-p4.metadataDecodingStrategy=fallback p4.py clone --dest="$git" //depot@all &&
+	(
+		cd "$git" &&
+		git log >actual &&
+		grep "some utf-8 tǣxt" actual &&
+		grep "ǣuthor" actual
+	)
+'
+
+test_expect_success 'check latin-1 contents with fallback strategy' '
+	test_when_finished cleanup_git &&
+	test_when_finished remove_user_cache &&
+	git -c git-p4.metadataDecodingStrategy=fallback p4.py clone --dest="$git" //depot@all &&
+	(
+		cd "$git" &&
+		git log >actual &&
+		grep "some latin-1 tæxt" actual &&
+		grep "æuthor" actual
+	)
+'
+
+test_expect_success 'check cp-1252 contents with fallback strategy' '
+	test_when_finished cleanup_git &&
+	test_when_finished remove_user_cache &&
+	git -c git-p4.metadataDecodingStrategy=fallback p4.py clone --dest="$git" //depot@all &&
+	(
+		cd "$git" &&
+		git log >actual &&
+		grep "sœme cp-1252 tæxt" actual &&
+		grep "æuthœr" actual
+	)
+'
+
+test_expect_success 'check cp850 contents parsed with correct fallback' '
+	test_when_finished cleanup_git &&
+	test_when_finished remove_user_cache &&
+	git -c git-p4.metadataDecodingStrategy=fallback -c git-p4.metadataFallbackEncoding=cp850 p4.py clone --dest="$git" //depot@all &&
+	(
+		cd "$git" &&
+		git log >actual &&
+		grep "hÅs some cp850 text" actual &&
+		grep "Åuthor" actual
+	)
+'
+
+test_expect_success 'check cp850-only contents escaped when cp1252 is fallback' '
+	test_when_finished cleanup_git &&
+	test_when_finished remove_user_cache &&
+	git -c git-p4.metadataDecodingStrategy=fallback p4.py clone --dest="$git" //depot@all &&
+	(
+		cd "$git" &&
+		git log >actual &&
+		grep "h%8Fs some cp850 text" actual &&
+		grep "%8Futhor" actual
+	)
+'
+
+test_expect_success 'check cp-1252 contents on later sync after clone with fallback strategy' '
+	test_when_finished cleanup_git &&
+	test_when_finished remove_user_cache &&
+	git -c git-p4.metadataDecodingStrategy=fallback p4.py clone --dest="$git" //depot@all &&
+	(
+		cd "$cli" &&
+		P4USER=cp1252_author &&
+		touch file10 &&
+		p4 add file10 &&
+		p4 submit -d "$(echo later CL has sœme more cp-1252 tæxt |
+			iconv -f utf8 -t cp1252)"
+	) &&
+	(
+		cd "$git" &&
+
+		git p4.py sync --branch=master &&
+
+		git log p4/master >actual &&
+		grep "sœme more cp-1252 tæxt" actual &&
+		grep "æuthœr" actual
+	)
+'
+
+############################
+## / END REPEATED SECTION ##
+############################
+
+test_expect_success 'passthrough (latin-1 contents corrupted in git) is the default with python2' '
+	test_when_finished cleanup_git &&
+	test_when_finished remove_user_cache &&
+	git -c git-p4.metadataDecodingStrategy=passthrough p4.py clone --dest="$git" //depot@all &&
+	(
+		cd "$git" &&
+		git log >actual &&
+		badly_encoded_in_git=$(echo "some latin-1 tæxt" | iconv -f utf8 -t latin1) &&
+		grep "$badly_encoded_in_git" actual
+	)
+'
+
+test_done
diff --git a/t/t9836-git-p4-metadata-encoding-python3.sh b/t/t9836-git-p4-metadata-encoding-python3.sh
new file mode 100755
index 0000000..63350dc
--- /dev/null
+++ b/t/t9836-git-p4-metadata-encoding-python3.sh
@@ -0,0 +1,214 @@
+#!/bin/sh
+
+test_description='git p4 metadata encoding
+
+This test checks that the import process handles inconsistent text
+encoding in p4 metadata (author names, commit messages, etc) without
+failing, and produces maximally sane output in git.'
+
+. ./lib-git-p4.sh
+
+python_target_version='3'
+
+###############################
+## SECTION REPEATED IN t9835 ##
+###############################
+
+# Please note: this test calls "git-p4.py" rather than "git-p4", because the
+# latter references a specific path so we can't easily force it to run under
+# the python version we need to.
+
+python_major_version=$(python -V 2>&1 | cut -c  8)
+python_target_binary=$(which python$python_target_version)
+if ! test "$python_major_version" = "$python_target_version" && test "$python_target_binary"
+then
+	mkdir temp_python
+	PATH="$(pwd)/temp_python:$PATH" && export PATH
+	ln -s $python_target_binary temp_python/python
+fi
+
+python_major_version=$(python -V 2>&1 | cut -c  8)
+if ! test "$python_major_version" = "$python_target_version"
+then
+	skip_all="skipping python$python_target_version-specific git p4 tests; python$python_target_version not available"
+	test_done
+fi
+
+remove_user_cache () {
+	rm "$HOME/.gitp4-usercache.txt" || true
+}
+
+test_expect_success 'start p4d' '
+	start_p4d
+'
+
+test_expect_success 'init depot' '
+	(
+		cd "$cli" &&
+
+		p4_add_user "utf8_author" "ǣuthor" &&
+		P4USER=utf8_author &&
+		touch file1 &&
+		p4 add file1 &&
+		p4 submit -d "first CL has some utf-8 tǣxt" &&
+
+		p4_add_user "latin1_author" "$(echo æuthor |
+			iconv -f utf8 -t latin1)" &&
+		P4USER=latin1_author &&
+		touch file2 &&
+		p4 add file2 &&
+		p4 submit -d "$(echo second CL has some latin-1 tæxt |
+			iconv -f utf8 -t latin1)" &&
+
+		p4_add_user "cp1252_author" "$(echo æuthœr |
+			iconv -f utf8 -t cp1252)" &&
+		P4USER=cp1252_author &&
+		touch file3 &&
+		p4 add file3 &&
+		p4 submit -d "$(echo third CL has sœme cp-1252 tæxt |
+		  iconv -f utf8 -t cp1252)" &&
+
+		p4_add_user "cp850_author" "$(echo Åuthor |
+			iconv -f utf8 -t cp850)" &&
+		P4USER=cp850_author &&
+		touch file4 &&
+		p4 add file4 &&
+		p4 submit -d "$(echo fourth CL hÅs some cp850 text |
+			iconv -f utf8 -t cp850)"
+	)
+'
+
+test_expect_success 'clone non-utf8 repo with strict encoding' '
+	test_when_finished cleanup_git &&
+	test_when_finished remove_user_cache &&
+	test_must_fail git -c git-p4.metadataDecodingStrategy=strict p4.py clone --dest="$git" //depot@all 2>err &&
+	grep "Decoding perforce metadata failed!" err
+'
+
+test_expect_success 'check utf-8 contents with passthrough strategy' '
+	test_when_finished cleanup_git &&
+	test_when_finished remove_user_cache &&
+	git -c git-p4.metadataDecodingStrategy=passthrough p4.py clone --dest="$git" //depot@all &&
+	(
+		cd "$git" &&
+		git log >actual &&
+		grep "some utf-8 tǣxt" actual &&
+		grep "ǣuthor" actual
+	)
+'
+
+test_expect_success 'check latin-1 contents corrupted in git with passthrough strategy' '
+	test_when_finished cleanup_git &&
+	test_when_finished remove_user_cache &&
+	git -c git-p4.metadataDecodingStrategy=passthrough p4.py clone --dest="$git" //depot@all &&
+	(
+		cd "$git" &&
+		git log >actual &&
+		badly_encoded_in_git=$(echo "some latin-1 tæxt" | iconv -f utf8 -t latin1) &&
+		grep "$badly_encoded_in_git" actual &&
+		bad_author_in_git="$(echo æuthor | iconv -f utf8 -t latin1)" &&
+		grep "$bad_author_in_git" actual
+	)
+'
+
+test_expect_success 'check utf-8 contents with fallback strategy' '
+	test_when_finished cleanup_git &&
+	test_when_finished remove_user_cache &&
+	git -c git-p4.metadataDecodingStrategy=fallback p4.py clone --dest="$git" //depot@all &&
+	(
+		cd "$git" &&
+		git log >actual &&
+		grep "some utf-8 tǣxt" actual &&
+		grep "ǣuthor" actual
+	)
+'
+
+test_expect_success 'check latin-1 contents with fallback strategy' '
+	test_when_finished cleanup_git &&
+	test_when_finished remove_user_cache &&
+	git -c git-p4.metadataDecodingStrategy=fallback p4.py clone --dest="$git" //depot@all &&
+	(
+		cd "$git" &&
+		git log >actual &&
+		grep "some latin-1 tæxt" actual &&
+		grep "æuthor" actual
+	)
+'
+
+test_expect_success 'check cp-1252 contents with fallback strategy' '
+	test_when_finished cleanup_git &&
+	test_when_finished remove_user_cache &&
+	git -c git-p4.metadataDecodingStrategy=fallback p4.py clone --dest="$git" //depot@all &&
+	(
+		cd "$git" &&
+		git log >actual &&
+		grep "sœme cp-1252 tæxt" actual &&
+		grep "æuthœr" actual
+	)
+'
+
+test_expect_success 'check cp850 contents parsed with correct fallback' '
+	test_when_finished cleanup_git &&
+	test_when_finished remove_user_cache &&
+	git -c git-p4.metadataDecodingStrategy=fallback -c git-p4.metadataFallbackEncoding=cp850 p4.py clone --dest="$git" //depot@all &&
+	(
+		cd "$git" &&
+		git log >actual &&
+		grep "hÅs some cp850 text" actual &&
+		grep "Åuthor" actual
+	)
+'
+
+test_expect_success 'check cp850-only contents escaped when cp1252 is fallback' '
+	test_when_finished cleanup_git &&
+	test_when_finished remove_user_cache &&
+	git -c git-p4.metadataDecodingStrategy=fallback p4.py clone --dest="$git" //depot@all &&
+	(
+		cd "$git" &&
+		git log >actual &&
+		grep "h%8Fs some cp850 text" actual &&
+		grep "%8Futhor" actual
+	)
+'
+
+test_expect_success 'check cp-1252 contents on later sync after clone with fallback strategy' '
+	test_when_finished cleanup_git &&
+	test_when_finished remove_user_cache &&
+	git -c git-p4.metadataDecodingStrategy=fallback p4.py clone --dest="$git" //depot@all &&
+	(
+		cd "$cli" &&
+		P4USER=cp1252_author &&
+		touch file10 &&
+		p4 add file10 &&
+		p4 submit -d "$(echo later CL has sœme more cp-1252 tæxt |
+			iconv -f utf8 -t cp1252)"
+	) &&
+	(
+		cd "$git" &&
+
+		git p4.py sync --branch=master &&
+
+		git log p4/master >actual &&
+		grep "sœme more cp-1252 tæxt" actual &&
+		grep "æuthœr" actual
+	)
+'
+
+############################
+## / END REPEATED SECTION ##
+############################
+
+
+test_expect_success 'fallback (both utf-8 and cp-1252 contents handled) is the default with python3' '
+	test_when_finished cleanup_git &&
+	test_when_finished remove_user_cache &&
+	git p4.py clone --dest="$git" //depot@all &&
+	(
+		cd "$git" &&
+		git log >actual &&
+		grep "sœme cp-1252 tæxt" actual &&
+		grep "æuthœr" actual
+	)
+'
+
+test_done
diff --git a/t/t9850-shell.sh b/t/t9850-shell.sh
new file mode 100755
index 0000000..cfc71c3
--- /dev/null
+++ b/t/t9850-shell.sh
@@ -0,0 +1,37 @@
+#!/bin/sh
+
+test_description='git shell tests'
+. ./test-lib.sh
+
+test_expect_success 'shell allows upload-pack' '
+	printf 0000 >input &&
+	git upload-pack . <input >expect &&
+	git shell -c "git-upload-pack $SQ.$SQ" <input >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'shell forbids other commands' '
+	test_must_fail git shell -c "git config foo.bar baz"
+'
+
+test_expect_success 'shell forbids interactive use by default' '
+	test_must_fail git shell
+'
+
+test_expect_success 'shell allows interactive command' '
+	mkdir git-shell-commands &&
+	write_script git-shell-commands/ping <<-\EOF &&
+	echo pong
+	EOF
+	echo pong >expect &&
+	echo ping | git shell >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'shell complains of overlong commands' '
+	perl -e "print \"a\" x 2**12 for (0..2**19)" |
+	test_must_fail git shell 2>err &&
+	grep "too long" err
+'
+
+test_done
diff --git a/t/t9901-git-web--browse.sh b/t/t9901-git-web--browse.sh
index de7152f..19f56e5 100755
--- a/t/t9901-git-web--browse.sh
+++ b/t/t9901-git-web--browse.sh
@@ -5,6 +5,7 @@ test_description='git web--browse basic tests
 
 This test checks that git web--browse can handle various valid URLs.'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_web_browse () {
diff --git a/t/t9902-completion.sh b/t/t9902-completion.sh
index 8425b9a..569cf23 100755
--- a/t/t9902-completion.sh
+++ b/t/t9902-completion.sh
@@ -1,10 +1,21 @@
 #!/bin/sh
 #
-# Copyright (c) 2012 Felipe Contreras
+# Copyright (c) 2012-2020 Felipe Contreras
 #
 
 test_description='test bash completion'
 
+# The Bash completion scripts must not print anything to either stdout or
+# stderr, which we try to verify. When tracing is enabled without support for
+# BASH_XTRACEFD this assertion will fail, so we have to mark the test as
+# untraceable with such ancient Bash versions.
+test_untraceable=UnfortunatelyYes
+
+# Override environment and always use master for the default initial branch
+# name for these tests, so that rev completion candidates are as expected.
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=master
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./lib-bash.sh
 
 complete ()
@@ -87,9 +98,11 @@ test_completion ()
 	else
 		sed -e 's/Z$//' |sort >expected
 	fi &&
-	run_completion "$1" &&
+	run_completion "$1" >"$TRASH_DIRECTORY"/bash-completion-output 2>&1 &&
 	sort out >out_sorted &&
-	test_cmp expected out_sorted
+	test_cmp expected out_sorted &&
+	test_must_be_empty "$TRASH_DIRECTORY"/bash-completion-output &&
+	rm "$TRASH_DIRECTORY"/bash-completion-output
 }
 
 # Test __gitcomp.
@@ -136,7 +149,7 @@ fi
 test_expect_success 'setup for __git_find_repo_path/__gitdir tests' '
 	mkdir -p subdir/subsubdir &&
 	mkdir -p non-repo &&
-	git init otherrepo
+	git init -b main otherrepo
 '
 
 test_expect_success '__git_find_repo_path - from command line (through $__git_dir)' '
@@ -405,40 +418,40 @@ test_expect_success '__gitdir - remote as argument' '
 
 test_expect_success '__git_dequote - plain unquoted word' '
 	__git_dequote unquoted-word &&
-	verbose test unquoted-word = "$dequoted_word"
+	test unquoted-word = "$dequoted_word"
 '
 
 # input:    b\a\c\k\'\\\"s\l\a\s\h\es
 # expected: back'\"slashes
 test_expect_success '__git_dequote - backslash escaped' '
 	__git_dequote "b\a\c\k\\'\''\\\\\\\"s\l\a\s\h\es" &&
-	verbose test "back'\''\\\"slashes" = "$dequoted_word"
+	test "back'\''\\\"slashes" = "$dequoted_word"
 '
 
 # input:    sin'gle\' '"quo'ted
 # expected: single\ "quoted
 test_expect_success '__git_dequote - single quoted' '
 	__git_dequote "'"sin'gle\\\\' '\\\"quo'ted"'" &&
-	verbose test '\''single\ "quoted'\'' = "$dequoted_word"
+	test '\''single\ "quoted'\'' = "$dequoted_word"
 '
 
 # input:    dou"ble\\" "\"\quot"ed
 # expected: double\ "\quoted
 test_expect_success '__git_dequote - double quoted' '
 	__git_dequote '\''dou"ble\\" "\"\quot"ed'\'' &&
-	verbose test '\''double\ "\quoted'\'' = "$dequoted_word"
+	test '\''double\ "\quoted'\'' = "$dequoted_word"
 '
 
 # input: 'open single quote
 test_expect_success '__git_dequote - open single quote' '
 	__git_dequote "'\''open single quote" &&
-	verbose test "open single quote" = "$dequoted_word"
+	test "open single quote" = "$dequoted_word"
 '
 
 # input: "open double quote
 test_expect_success '__git_dequote - open double quote' '
 	__git_dequote "\"open double quote" &&
-	verbose test "open double quote" = "$dequoted_word"
+	test "open double quote" = "$dequoted_word"
 '
 
 
@@ -537,42 +550,51 @@ test_expect_success '__gitcomp - expand/narrow all negative options' '
 	EOF
 '
 
+test_expect_success '__gitcomp - equal skip' '
+	test_gitcomp "--option=" "--option=" <<-\EOF &&
+
+	EOF
+	test_gitcomp "option=" "option=" <<-\EOF
+
+	EOF
+'
+
 test_expect_success '__gitcomp - doesnt fail because of invalid variable name' '
 	__gitcomp "$invalid_variable_name"
 '
 
 read -r -d "" refs <<-\EOF
+main
 maint
-master
 next
 seen
 EOF
 
 test_expect_success '__gitcomp_nl - trailing space' '
 	test_gitcomp_nl "m" "$refs" <<-EOF
+	main Z
 	maint Z
-	master Z
 	EOF
 '
 
 test_expect_success '__gitcomp_nl - prefix' '
 	test_gitcomp_nl "--fixup=m" "$refs" "--fixup=" "m" <<-EOF
+	--fixup=main Z
 	--fixup=maint Z
-	--fixup=master Z
 	EOF
 '
 
 test_expect_success '__gitcomp_nl - suffix' '
 	test_gitcomp_nl "branch.ma" "$refs" "branch." "ma" "." <<-\EOF
+	branch.main.Z
 	branch.maint.Z
-	branch.master.Z
 	EOF
 '
 
 test_expect_success '__gitcomp_nl - no suffix' '
 	test_gitcomp_nl "ma" "$refs" "" "ma" "" <<-\EOF
+	mainZ
 	maintZ
-	masterZ
 	EOF
 '
 
@@ -607,19 +629,20 @@ test_expect_success '__git_is_configured_remote' '
 	test_when_finished "git remote remove remote_2" &&
 	git remote add remote_2 git://remote_2 &&
 	(
-		verbose __git_is_configured_remote remote_2 &&
+		__git_is_configured_remote remote_2 &&
 		test_must_fail __git_is_configured_remote non-existent
 	)
 '
 
 test_expect_success 'setup for ref completion' '
 	git commit --allow-empty -m initial &&
+	git branch -M main &&
 	git branch matching-branch &&
 	git tag matching-tag &&
 	(
 		cd otherrepo &&
 		git commit --allow-empty -m initial &&
-		git branch -m master master-in-other &&
+		git branch -m main main-in-other &&
 		git branch branch-in-other &&
 		git tag tag-in-other
 	) &&
@@ -632,10 +655,10 @@ test_expect_success 'setup for ref completion' '
 test_expect_success '__git_refs - simple' '
 	cat >expected <<-EOF &&
 	HEAD
-	master
+	main
 	matching-branch
 	other/branch-in-other
-	other/master-in-other
+	other/main-in-other
 	matching-tag
 	EOF
 	(
@@ -647,10 +670,10 @@ test_expect_success '__git_refs - simple' '
 
 test_expect_success '__git_refs - full refs' '
 	cat >expected <<-EOF &&
-	refs/heads/master
+	refs/heads/main
 	refs/heads/matching-branch
 	refs/remotes/other/branch-in-other
-	refs/remotes/other/master-in-other
+	refs/remotes/other/main-in-other
 	refs/tags/matching-tag
 	EOF
 	(
@@ -664,7 +687,7 @@ test_expect_success '__git_refs - repo given on the command line' '
 	cat >expected <<-EOF &&
 	HEAD
 	branch-in-other
-	master-in-other
+	main-in-other
 	tag-in-other
 	EOF
 	(
@@ -679,7 +702,7 @@ test_expect_success '__git_refs - remote on local file system' '
 	cat >expected <<-EOF &&
 	HEAD
 	branch-in-other
-	master-in-other
+	main-in-other
 	tag-in-other
 	EOF
 	(
@@ -692,7 +715,7 @@ test_expect_success '__git_refs - remote on local file system' '
 test_expect_success '__git_refs - remote on local file system - full refs' '
 	cat >expected <<-EOF &&
 	refs/heads/branch-in-other
-	refs/heads/master-in-other
+	refs/heads/main-in-other
 	refs/tags/tag-in-other
 	EOF
 	(
@@ -706,7 +729,7 @@ test_expect_success '__git_refs - configured remote' '
 	cat >expected <<-EOF &&
 	HEAD
 	branch-in-other
-	master-in-other
+	main-in-other
 	EOF
 	(
 		cur= &&
@@ -719,7 +742,7 @@ test_expect_success '__git_refs - configured remote - full refs' '
 	cat >expected <<-EOF &&
 	HEAD
 	refs/heads/branch-in-other
-	refs/heads/master-in-other
+	refs/heads/main-in-other
 	refs/tags/tag-in-other
 	EOF
 	(
@@ -733,7 +756,7 @@ test_expect_success '__git_refs - configured remote - repo given on the command
 	cat >expected <<-EOF &&
 	HEAD
 	branch-in-other
-	master-in-other
+	main-in-other
 	EOF
 	(
 		cd thirdrepo &&
@@ -748,7 +771,7 @@ test_expect_success '__git_refs - configured remote - full refs - repo given on
 	cat >expected <<-EOF &&
 	HEAD
 	refs/heads/branch-in-other
-	refs/heads/master-in-other
+	refs/heads/main-in-other
 	refs/tags/tag-in-other
 	EOF
 	(
@@ -764,7 +787,7 @@ test_expect_success '__git_refs - configured remote - remote name matches a dire
 	cat >expected <<-EOF &&
 	HEAD
 	branch-in-other
-	master-in-other
+	main-in-other
 	EOF
 	mkdir other &&
 	test_when_finished "rm -rf other" &&
@@ -779,7 +802,7 @@ test_expect_success '__git_refs - URL remote' '
 	cat >expected <<-EOF &&
 	HEAD
 	branch-in-other
-	master-in-other
+	main-in-other
 	tag-in-other
 	EOF
 	(
@@ -793,7 +816,7 @@ test_expect_success '__git_refs - URL remote - full refs' '
 	cat >expected <<-EOF &&
 	HEAD
 	refs/heads/branch-in-other
-	refs/heads/master-in-other
+	refs/heads/main-in-other
 	refs/tags/tag-in-other
 	EOF
 	(
@@ -849,24 +872,24 @@ test_expect_success '__git_refs - not in a git repository' '
 test_expect_success '__git_refs - unique remote branches for git checkout DWIMery' '
 	cat >expected <<-EOF &&
 	HEAD
-	master
+	main
 	matching-branch
 	other/ambiguous
 	other/branch-in-other
-	other/master-in-other
+	other/main-in-other
 	remote/ambiguous
 	remote/branch-in-remote
 	matching-tag
 	branch-in-other
 	branch-in-remote
-	master-in-other
+	main-in-other
 	EOF
 	for remote_ref in refs/remotes/other/ambiguous \
 		refs/remotes/remote/ambiguous \
 		refs/remotes/remote/branch-in-remote
 	do
-		git update-ref $remote_ref master &&
-		test_when_finished "git update-ref -d $remote_ref"
+		git update-ref $remote_ref main &&
+		test_when_finished "git update-ref -d $remote_ref" || return 1
 	done &&
 	(
 		cur= &&
@@ -878,10 +901,10 @@ test_expect_success '__git_refs - unique remote branches for git checkout DWIMer
 test_expect_success '__git_refs - after --opt=' '
 	cat >expected <<-EOF &&
 	HEAD
-	master
+	main
 	matching-branch
 	other/branch-in-other
-	other/master-in-other
+	other/main-in-other
 	matching-tag
 	EOF
 	(
@@ -893,10 +916,10 @@ test_expect_success '__git_refs - after --opt=' '
 
 test_expect_success '__git_refs - after --opt= - full refs' '
 	cat >expected <<-EOF &&
-	refs/heads/master
+	refs/heads/main
 	refs/heads/matching-branch
 	refs/remotes/other/branch-in-other
-	refs/remotes/other/master-in-other
+	refs/remotes/other/main-in-other
 	refs/tags/matching-tag
 	EOF
 	(
@@ -906,13 +929,13 @@ test_expect_success '__git_refs - after --opt= - full refs' '
 	test_cmp expected "$actual"
 '
 
-test_expect_success '__git refs - exluding refs' '
+test_expect_success '__git refs - excluding refs' '
 	cat >expected <<-EOF &&
 	^HEAD
-	^master
+	^main
 	^matching-branch
 	^other/branch-in-other
-	^other/master-in-other
+	^other/main-in-other
 	^matching-tag
 	EOF
 	(
@@ -922,12 +945,12 @@ test_expect_success '__git refs - exluding refs' '
 	test_cmp expected "$actual"
 '
 
-test_expect_success '__git refs - exluding full refs' '
+test_expect_success '__git refs - excluding full refs' '
 	cat >expected <<-EOF &&
-	^refs/heads/master
+	^refs/heads/main
 	^refs/heads/matching-branch
 	^refs/remotes/other/branch-in-other
-	^refs/remotes/other/master-in-other
+	^refs/remotes/other/main-in-other
 	^refs/tags/matching-tag
 	EOF
 	(
@@ -948,17 +971,17 @@ test_expect_success 'setup for filtering matching refs' '
 test_expect_success '__git_refs - do not filter refs unless told so' '
 	cat >expected <<-EOF &&
 	HEAD
-	master
+	main
 	matching-branch
 	matching/branch
 	other/branch-in-other
-	other/master-in-other
+	other/main-in-other
 	other/matching/branch-in-other
 	matching-tag
 	matching/tag
 	EOF
 	(
-		cur=master &&
+		cur=main &&
 		__git_refs >"$actual"
 	) &&
 	test_cmp expected "$actual"
@@ -992,7 +1015,7 @@ test_expect_success '__git_refs - only matching refs - full refs' '
 
 test_expect_success '__git_refs - only matching refs - remote on local file system' '
 	cat >expected <<-EOF &&
-	master-in-other
+	main-in-other
 	matching/branch-in-other
 	EOF
 	(
@@ -1004,7 +1027,7 @@ test_expect_success '__git_refs - only matching refs - remote on local file syst
 
 test_expect_success '__git_refs - only matching refs - configured remote' '
 	cat >expected <<-EOF &&
-	master-in-other
+	main-in-other
 	matching/branch-in-other
 	EOF
 	(
@@ -1016,7 +1039,7 @@ test_expect_success '__git_refs - only matching refs - configured remote' '
 
 test_expect_success '__git_refs - only matching refs - remote - full refs' '
 	cat >expected <<-EOF &&
-	refs/heads/master-in-other
+	refs/heads/main-in-other
 	refs/heads/matching/branch-in-other
 	EOF
 	(
@@ -1038,8 +1061,8 @@ test_expect_success '__git_refs - only matching refs - checkout DWIMery' '
 		refs/remotes/remote/ambiguous \
 		refs/remotes/remote/branch-in-remote
 	do
-		git update-ref $remote_ref master &&
-		test_when_finished "git update-ref -d $remote_ref"
+		git update-ref $remote_ref main &&
+		test_when_finished "git update-ref -d $remote_ref" || return 1
 	done &&
 	(
 		cur=mat &&
@@ -1057,11 +1080,11 @@ test_expect_success 'teardown after filtering matching refs' '
 
 test_expect_success '__git_refs - for-each-ref format specifiers in prefix' '
 	cat >expected <<-EOF &&
-	evil-%%-%42-%(refname)..master
+	evil-%%-%42-%(refname)..main
 	EOF
 	(
-		cur="evil-%%-%42-%(refname)..mas" &&
-		__git_refs "" "" "evil-%%-%42-%(refname).." mas >"$actual"
+		cur="evil-%%-%42-%(refname)..mai" &&
+		__git_refs "" "" "evil-%%-%42-%(refname).." mai >"$actual"
 	) &&
 	test_cmp expected "$actual"
 '
@@ -1069,10 +1092,10 @@ test_expect_success '__git_refs - for-each-ref format specifiers in prefix' '
 test_expect_success '__git_complete_refs - simple' '
 	sed -e "s/Z$//" >expected <<-EOF &&
 	HEAD Z
-	master Z
+	main Z
 	matching-branch Z
 	other/branch-in-other Z
-	other/master-in-other Z
+	other/main-in-other Z
 	matching-tag Z
 	EOF
 	(
@@ -1100,7 +1123,7 @@ test_expect_success '__git_complete_refs - remote' '
 	sed -e "s/Z$//" >expected <<-EOF &&
 	HEAD Z
 	branch-in-other Z
-	master-in-other Z
+	main-in-other Z
 	EOF
 	(
 		cur= &&
@@ -1113,13 +1136,13 @@ test_expect_success '__git_complete_refs - remote' '
 test_expect_success '__git_complete_refs - track' '
 	sed -e "s/Z$//" >expected <<-EOF &&
 	HEAD Z
-	master Z
+	main Z
 	matching-branch Z
 	other/branch-in-other Z
-	other/master-in-other Z
+	other/main-in-other Z
 	matching-tag Z
 	branch-in-other Z
-	master-in-other Z
+	main-in-other Z
 	EOF
 	(
 		cur= &&
@@ -1158,10 +1181,10 @@ test_expect_success '__git_complete_refs - prefix' '
 test_expect_success '__git_complete_refs - suffix' '
 	cat >expected <<-EOF &&
 	HEAD.
-	master.
+	main.
 	matching-branch.
 	other/branch-in-other.
-	other/master-in-other.
+	other/main-in-other.
 	matching-tag.
 	EOF
 	(
@@ -1176,7 +1199,7 @@ test_expect_success '__git_complete_fetch_refspecs - simple' '
 	sed -e "s/Z$//" >expected <<-EOF &&
 	HEAD:HEAD Z
 	branch-in-other:branch-in-other Z
-	master-in-other:master-in-other Z
+	main-in-other:main-in-other Z
 	EOF
 	(
 		cur= &&
@@ -1202,7 +1225,7 @@ test_expect_success '__git_complete_fetch_refspecs - prefix' '
 	sed -e "s/Z$//" >expected <<-EOF &&
 	+HEAD:HEAD Z
 	+branch-in-other:branch-in-other Z
-	+master-in-other:master-in-other Z
+	+main-in-other:main-in-other Z
 	EOF
 	(
 		cur="+" &&
@@ -1215,7 +1238,7 @@ test_expect_success '__git_complete_fetch_refspecs - prefix' '
 test_expect_success '__git_complete_fetch_refspecs - fully qualified' '
 	sed -e "s/Z$//" >expected <<-EOF &&
 	refs/heads/branch-in-other:refs/heads/branch-in-other Z
-	refs/heads/master-in-other:refs/heads/master-in-other Z
+	refs/heads/main-in-other:refs/heads/main-in-other Z
 	refs/tags/tag-in-other:refs/tags/tag-in-other Z
 	EOF
 	(
@@ -1229,7 +1252,7 @@ test_expect_success '__git_complete_fetch_refspecs - fully qualified' '
 test_expect_success '__git_complete_fetch_refspecs - fully qualified & prefix' '
 	sed -e "s/Z$//" >expected <<-EOF &&
 	+refs/heads/branch-in-other:refs/heads/branch-in-other Z
-	+refs/heads/master-in-other:refs/heads/master-in-other Z
+	+refs/heads/main-in-other:refs/heads/main-in-other Z
 	+refs/tags/tag-in-other:refs/tags/tag-in-other Z
 	EOF
 	(
@@ -1240,38 +1263,197 @@ test_expect_success '__git_complete_fetch_refspecs - fully qualified & prefix' '
 	test_cmp expected out
 '
 
+test_expect_success '__git_complete_worktree_paths' '
+	test_when_finished "git worktree remove other_wt" &&
+	git worktree add --orphan other_wt &&
+	run_completion "git worktree remove " &&
+	grep other_wt out
+'
+
+test_expect_success '__git_complete_worktree_paths - not a git repository' '
+	(
+		cd non-repo &&
+		GIT_CEILING_DIRECTORIES="$ROOT" &&
+		export GIT_CEILING_DIRECTORIES &&
+		test_completion "git worktree remove " ""
+	)
+'
+
+test_expect_success '__git_complete_worktree_paths with -C' '
+	test_when_finished "git -C otherrepo worktree remove otherrepo_wt" &&
+	git -C otherrepo worktree add --orphan otherrepo_wt &&
+	run_completion "git -C otherrepo worktree remove " &&
+	grep otherrepo_wt out
+'
+
 test_expect_success 'git switch - with no options, complete local branches and unique remote branch names for DWIM logic' '
 	test_completion "git switch " <<-\EOF
 	branch-in-other Z
-	master Z
-	master-in-other Z
+	main Z
+	main-in-other Z
 	matching-branch Z
 	EOF
 '
 
+test_expect_success 'git bisect - when not bisecting, complete only replay and start subcommands' '
+	test_completion "git bisect " <<-\EOF
+	replay Z
+	start Z
+	EOF
+'
+
+test_expect_success 'git bisect - complete options to start subcommand' '
+	test_completion "git bisect start --" <<-\EOF
+	--term-new Z
+	--term-bad Z
+	--term-old Z
+	--term-good Z
+	--no-checkout Z
+	--first-parent Z
+	EOF
+'
+
+test_expect_success 'setup for git-bisect tests requiring a repo' '
+	git init git-bisect &&
+	(
+		cd git-bisect &&
+		echo "initial contents" >file &&
+		git add file &&
+		git commit -am "Initial commit" &&
+		git tag initial &&
+		echo "new line" >>file &&
+		git commit -am "First change" &&
+		echo "another new line" >>file &&
+		git commit -am "Second change" &&
+		git tag final
+	)
+'
+
+test_expect_success 'git bisect - start subcommand arguments before double-dash are completed as revs' '
+	(
+		cd git-bisect &&
+		test_completion "git bisect start " <<-\EOF
+		HEAD Z
+		final Z
+		initial Z
+		master Z
+		EOF
+	)
+'
+
+# Note that these arguments are <pathspec>s, which in practice the fallback
+# completion (not the git completion) later ends up completing as paths.
+test_expect_success 'git bisect - start subcommand arguments after double-dash are not completed' '
+	(
+		cd git-bisect &&
+		test_completion "git bisect start final initial -- " ""
+	)
+'
+
+test_expect_success 'setup for git-bisect tests requiring ongoing bisection' '
+	(
+		cd git-bisect &&
+		git bisect start --term-new=custom_new --term-old=custom_old final initial
+	)
+'
+
+test_expect_success 'git-bisect - when bisecting all subcommands are candidates' '
+	(
+		cd git-bisect &&
+		test_completion "git bisect " <<-\EOF
+		start Z
+		bad Z
+		custom_new Z
+		custom_old Z
+		new Z
+		good Z
+		old Z
+		terms Z
+		skip Z
+		reset Z
+		visualize Z
+		replay Z
+		log Z
+		run Z
+		help Z
+		EOF
+	)
+'
+
+test_expect_success 'git-bisect - options to terms subcommand are candidates' '
+	(
+		cd git-bisect &&
+		test_completion "git bisect terms --" <<-\EOF
+		--term-bad Z
+		--term-good Z
+		--term-new Z
+		--term-old Z
+		EOF
+	)
+'
+
+test_expect_success 'git-bisect - git-log options to visualize subcommand are candidates' '
+	(
+		cd git-bisect &&
+		# The completion used for git-log and here does not complete
+		# every git-log option, so rather than hope to stay in sync
+		# with exactly what it does we will just spot-test here.
+		test_completion "git bisect visualize --sta" <<-\EOF &&
+		--stat Z
+		EOF
+		test_completion "git bisect visualize --summar" <<-\EOF
+		--summary Z
+		EOF
+	)
+'
+
+test_expect_success 'git-bisect - view subcommand is not a candidate' '
+	(
+		cd git-bisect &&
+		test_completion "git bisect vi" <<-\EOF
+		visualize Z
+		EOF
+	)
+'
+
+test_expect_success 'git-bisect - existing view subcommand is recognized and enables completion of git-log options' '
+	(
+		cd git-bisect &&
+		# The completion used for git-log and here does not complete
+		# every git-log option, so rather than hope to stay in sync
+		# with exactly what it does we will just spot-test here.
+		test_completion "git bisect view --sta" <<-\EOF &&
+		--stat Z
+		EOF
+		test_completion "git bisect view --summar" <<-\EOF
+		--summary Z
+		EOF
+	)
+'
+
 test_expect_success 'git checkout - completes refs and unique remote branches for DWIM' '
 	test_completion "git checkout " <<-\EOF
 	HEAD Z
 	branch-in-other Z
-	master Z
-	master-in-other Z
+	main Z
+	main-in-other Z
 	matching-branch Z
 	matching-tag Z
 	other/branch-in-other Z
-	other/master-in-other Z
+	other/main-in-other Z
 	EOF
 '
 
 test_expect_success 'git switch - with --no-guess, complete only local branches' '
 	test_completion "git switch --no-guess " <<-\EOF
-	master Z
+	main Z
 	matching-branch Z
 	EOF
 '
 
 test_expect_success 'git switch - with GIT_COMPLETION_CHECKOUT_NO_GUESS=1, complete only local branches' '
 	GIT_COMPLETION_CHECKOUT_NO_GUESS=1 test_completion "git switch " <<-\EOF
-	master Z
+	main Z
 	matching-branch Z
 	EOF
 '
@@ -1279,8 +1461,8 @@ test_expect_success 'git switch - with GIT_COMPLETION_CHECKOUT_NO_GUESS=1, compl
 test_expect_success 'git switch - --guess overrides GIT_COMPLETION_CHECKOUT_NO_GUESS=1, complete local branches and unique remote names for DWIM logic' '
 	GIT_COMPLETION_CHECKOUT_NO_GUESS=1 test_completion "git switch --guess " <<-\EOF
 	branch-in-other Z
-	master Z
-	master-in-other Z
+	main Z
+	main-in-other Z
 	matching-branch Z
 	EOF
 '
@@ -1288,15 +1470,15 @@ test_expect_success 'git switch - --guess overrides GIT_COMPLETION_CHECKOUT_NO_G
 test_expect_success 'git switch - a later --guess overrides previous --no-guess, complete local and remote unique branches for DWIM' '
 	test_completion "git switch --no-guess --guess " <<-\EOF
 	branch-in-other Z
-	master Z
-	master-in-other Z
+	main Z
+	main-in-other Z
 	matching-branch Z
 	EOF
 '
 
 test_expect_success 'git switch - a later --no-guess overrides previous --guess, complete only local branches' '
 	test_completion "git switch --guess --no-guess " <<-\EOF
-	master Z
+	main Z
 	matching-branch Z
 	EOF
 '
@@ -1304,11 +1486,11 @@ test_expect_success 'git switch - a later --no-guess overrides previous --guess,
 test_expect_success 'git checkout - with GIT_COMPLETION_NO_GUESS=1 only completes refs' '
 	GIT_COMPLETION_CHECKOUT_NO_GUESS=1 test_completion "git checkout " <<-\EOF
 	HEAD Z
-	master Z
+	main Z
 	matching-branch Z
 	matching-tag Z
 	other/branch-in-other Z
-	other/master-in-other Z
+	other/main-in-other Z
 	EOF
 '
 
@@ -1316,23 +1498,23 @@ test_expect_success 'git checkout - --guess overrides GIT_COMPLETION_NO_GUESS=1,
 	GIT_COMPLETION_CHECKOUT_NO_GUESS=1 test_completion "git checkout --guess " <<-\EOF
 	HEAD Z
 	branch-in-other Z
-	master Z
-	master-in-other Z
+	main Z
+	main-in-other Z
 	matching-branch Z
 	matching-tag Z
 	other/branch-in-other Z
-	other/master-in-other Z
+	other/main-in-other Z
 	EOF
 '
 
 test_expect_success 'git checkout - with --no-guess, only completes refs' '
 	test_completion "git checkout --no-guess " <<-\EOF
 	HEAD Z
-	master Z
+	main Z
 	matching-branch Z
 	matching-tag Z
 	other/branch-in-other Z
-	other/master-in-other Z
+	other/main-in-other Z
 	EOF
 '
 
@@ -1340,87 +1522,307 @@ test_expect_success 'git checkout - a later --guess overrides previous --no-gues
 	test_completion "git checkout --no-guess --guess " <<-\EOF
 	HEAD Z
 	branch-in-other Z
-	master Z
-	master-in-other Z
+	main Z
+	main-in-other Z
 	matching-branch Z
 	matching-tag Z
 	other/branch-in-other Z
-	other/master-in-other Z
+	other/main-in-other Z
 	EOF
 '
 
 test_expect_success 'git checkout - a later --no-guess overrides previous --guess, complete only refs' '
 	test_completion "git checkout --guess --no-guess " <<-\EOF
 	HEAD Z
-	master Z
+	main Z
+	matching-branch Z
+	matching-tag Z
+	other/branch-in-other Z
+	other/main-in-other Z
+	EOF
+'
+
+test_expect_success 'git checkout - with checkout.guess = false, only completes refs' '
+	test_config checkout.guess false &&
+	test_completion "git checkout " <<-\EOF
+	HEAD Z
+	main Z
+	matching-branch Z
+	matching-tag Z
+	other/branch-in-other Z
+	other/main-in-other Z
+	EOF
+'
+
+test_expect_success 'git checkout - with checkout.guess = true, completes refs and unique remote branches for DWIM' '
+	test_config checkout.guess true &&
+	test_completion "git checkout " <<-\EOF
+	HEAD Z
+	branch-in-other Z
+	main Z
+	main-in-other Z
+	matching-branch Z
+	matching-tag Z
+	other/branch-in-other Z
+	other/main-in-other Z
+	EOF
+'
+
+test_expect_success 'git checkout - a later --guess overrides previous checkout.guess = false, complete refs and unique remote branches for DWIM' '
+	test_config checkout.guess false &&
+	test_completion "git checkout --guess " <<-\EOF
+	HEAD Z
+	branch-in-other Z
+	main Z
+	main-in-other Z
+	matching-branch Z
+	matching-tag Z
+	other/branch-in-other Z
+	other/main-in-other Z
+	EOF
+'
+
+test_expect_success 'git checkout - a later --no-guess overrides previous checkout.guess = true, complete only refs' '
+	test_config checkout.guess true &&
+	test_completion "git checkout --no-guess " <<-\EOF
+	HEAD Z
+	main Z
 	matching-branch Z
 	matching-tag Z
 	other/branch-in-other Z
-	other/master-in-other Z
+	other/main-in-other Z
 	EOF
 '
 
 test_expect_success 'git switch - with --detach, complete all references' '
 	test_completion "git switch --detach " <<-\EOF
 	HEAD Z
-	master Z
+	main Z
 	matching-branch Z
 	matching-tag Z
 	other/branch-in-other Z
-	other/master-in-other Z
+	other/main-in-other Z
 	EOF
 '
 
 test_expect_success 'git checkout - with --detach, complete only references' '
 	test_completion "git checkout --detach " <<-\EOF
 	HEAD Z
-	master Z
+	main Z
 	matching-branch Z
 	matching-tag Z
 	other/branch-in-other Z
-	other/master-in-other Z
+	other/main-in-other Z
+	EOF
+'
+
+test_expect_success 'setup sparse-checkout tests' '
+	# set up sparse-checkout repo
+	git init sparse-checkout &&
+	(
+		cd sparse-checkout &&
+		mkdir -p folder1/0/1 folder2/0 folder3 &&
+		touch folder1/0/1/t.txt &&
+		touch folder2/0/t.txt &&
+		touch folder3/t.txt &&
+		git add . &&
+		git commit -am "Initial commit"
+	)
+'
+
+test_expect_success 'sparse-checkout completes subcommands' '
+	test_completion "git sparse-checkout " <<-\EOF
+	list Z
+	init Z
+	set Z
+	add Z
+	reapply Z
+	disable Z
 	EOF
 '
 
+test_expect_success 'cone mode sparse-checkout completes directory names' '
+	# initialize sparse-checkout definitions
+	git -C sparse-checkout sparse-checkout set --cone folder1/0 folder3 &&
+
+	# test tab completion
+	(
+		cd sparse-checkout &&
+		test_completion "git sparse-checkout set f" <<-\EOF
+		folder1/
+		folder2/
+		folder3/
+		EOF
+	) &&
+
+	(
+		cd sparse-checkout &&
+		test_completion "git sparse-checkout set folder1/" <<-\EOF
+		folder1/0/
+		EOF
+	) &&
+
+	(
+		cd sparse-checkout &&
+		test_completion "git sparse-checkout set folder1/0/" <<-\EOF
+		folder1/0/1/
+		EOF
+	) &&
+
+	(
+		cd sparse-checkout/folder1 &&
+		test_completion "git sparse-checkout add 0" <<-\EOF
+		0/
+		EOF
+	)
+'
+
+test_expect_success 'cone mode sparse-checkout completes directory names with spaces and accents' '
+	# reset sparse-checkout
+	git -C sparse-checkout sparse-checkout disable &&
+	(
+		cd sparse-checkout &&
+		mkdir "directory with spaces" &&
+		mkdir "directory-with-áccent" &&
+		>"directory with spaces/randomfile" &&
+		>"directory-with-áccent/randomfile" &&
+		git add . &&
+		git commit -m "Add directory with spaces and directory with accent" &&
+		git sparse-checkout set --cone "directory with spaces" \
+			"directory-with-áccent" &&
+		test_completion "git sparse-checkout add dir" <<-\EOF &&
+		directory with spaces/
+		directory-with-áccent/
+		EOF
+		rm -rf "directory with spaces" &&
+		rm -rf "directory-with-áccent" &&
+		git add . &&
+		git commit -m "Remove directory with spaces and directory with accent"
+	)
+'
+
+# use FUNNYNAMES to avoid running on Windows, which doesn't permit tabs in paths
+test_expect_success FUNNYNAMES 'cone mode sparse-checkout completes directory names with tabs' '
+	# reset sparse-checkout
+	git -C sparse-checkout sparse-checkout disable &&
+	(
+		cd sparse-checkout &&
+		mkdir "$(printf "directory\twith\ttabs")" &&
+		>"$(printf "directory\twith\ttabs")/randomfile" &&
+		git add . &&
+		git commit -m "Add directory with tabs" &&
+		git sparse-checkout set --cone \
+			"$(printf "directory\twith\ttabs")" &&
+		test_completion "git sparse-checkout add dir" <<-\EOF &&
+		directory	with	tabs/
+		EOF
+		rm -rf "$(printf "directory\twith\ttabs")" &&
+		git add . &&
+		git commit -m "Remove directory with tabs"
+	)
+'
+
+# use FUNNYNAMES to avoid running on Windows, and !CYGWIN for Cygwin, as neither permit backslashes in paths
+test_expect_success FUNNYNAMES,!CYGWIN 'cone mode sparse-checkout completes directory names with backslashes' '
+	# reset sparse-checkout
+	git -C sparse-checkout sparse-checkout disable &&
+	(
+		cd sparse-checkout &&
+		mkdir "directory\with\backslashes" &&
+		>"directory\with\backslashes/randomfile" &&
+		git add . &&
+		git commit -m "Add directory with backslashes" &&
+		git sparse-checkout set --cone \
+			"directory\with\backslashes" &&
+		test_completion "git sparse-checkout add dir" <<-\EOF &&
+		directory\with\backslashes/
+		EOF
+		rm -rf "directory\with\backslashes" &&
+		git add . &&
+		git commit -m "Remove directory with backslashes"
+	)
+'
+
+test_expect_success 'non-cone mode sparse-checkout gives rooted paths' '
+	# reset sparse-checkout repo to non-cone mode
+	git -C sparse-checkout sparse-checkout disable &&
+	git -C sparse-checkout sparse-checkout set --no-cone &&
+
+	(
+		cd sparse-checkout &&
+		# expected to be empty since we have not configured
+		# custom completion for non-cone mode
+		test_completion "git sparse-checkout set f" <<-\EOF
+		/folder1/0/1/t.txt Z
+		/folder1/expected Z
+		/folder1/out Z
+		/folder1/out_sorted Z
+		/folder2/0/t.txt Z
+		/folder3/t.txt Z
+		EOF
+	)
+'
+
+test_expect_success 'git sparse-checkout set --cone completes directory names' '
+	git -C sparse-checkout sparse-checkout disable &&
+
+	(
+		cd sparse-checkout &&
+		test_completion "git sparse-checkout set --cone f" <<-\EOF
+		folder1/
+		folder2/
+		folder3/
+		EOF
+	)
+'
+
 test_expect_success 'git switch - with -d, complete all references' '
 	test_completion "git switch -d " <<-\EOF
 	HEAD Z
-	master Z
+	main Z
 	matching-branch Z
 	matching-tag Z
 	other/branch-in-other Z
-	other/master-in-other Z
+	other/main-in-other Z
 	EOF
 '
 
 test_expect_success 'git checkout - with -d, complete only references' '
 	test_completion "git checkout -d " <<-\EOF
 	HEAD Z
-	master Z
+	main Z
 	matching-branch Z
 	matching-tag Z
 	other/branch-in-other Z
-	other/master-in-other Z
+	other/main-in-other Z
 	EOF
 '
 
 test_expect_success 'git switch - with --track, complete only remote branches' '
-	test_completion "git switch --track " <<-\EOF
+	test_completion "git switch --track " <<-\EOF &&
+	other/branch-in-other Z
+	other/main-in-other Z
+	EOF
+	test_completion "git switch -t " <<-\EOF
 	other/branch-in-other Z
-	other/master-in-other Z
+	other/main-in-other Z
 	EOF
 '
 
 test_expect_success 'git checkout - with --track, complete only remote branches' '
-	test_completion "git checkout --track " <<-\EOF
+	test_completion "git checkout --track " <<-\EOF &&
+	other/branch-in-other Z
+	other/main-in-other Z
+	EOF
+	test_completion "git checkout -t " <<-\EOF
 	other/branch-in-other Z
-	other/master-in-other Z
+	other/main-in-other Z
 	EOF
 '
 
 test_expect_success 'git switch - with --no-track, complete only local branch names' '
 	test_completion "git switch --no-track " <<-\EOF
-	master Z
+	main Z
 	matching-branch Z
 	EOF
 '
@@ -1428,151 +1830,151 @@ test_expect_success 'git switch - with --no-track, complete only local branch na
 test_expect_success 'git checkout - with --no-track, complete only local references' '
 	test_completion "git checkout --no-track " <<-\EOF
 	HEAD Z
-	master Z
+	main Z
 	matching-branch Z
 	matching-tag Z
 	other/branch-in-other Z
-	other/master-in-other Z
+	other/main-in-other Z
 	EOF
 '
 
 test_expect_success 'git switch - with -c, complete all references' '
 	test_completion "git switch -c new-branch " <<-\EOF
 	HEAD Z
-	master Z
+	main Z
 	matching-branch Z
 	matching-tag Z
 	other/branch-in-other Z
-	other/master-in-other Z
+	other/main-in-other Z
 	EOF
 '
 
 test_expect_success 'git switch - with -C, complete all references' '
 	test_completion "git switch -C new-branch " <<-\EOF
 	HEAD Z
-	master Z
+	main Z
 	matching-branch Z
 	matching-tag Z
 	other/branch-in-other Z
-	other/master-in-other Z
+	other/main-in-other Z
 	EOF
 '
 
 test_expect_success 'git switch - with -c and --track, complete all references' '
 	test_completion "git switch -c new-branch --track " <<-EOF
 	HEAD Z
-	master Z
+	main Z
 	matching-branch Z
 	matching-tag Z
 	other/branch-in-other Z
-	other/master-in-other Z
+	other/main-in-other Z
 	EOF
 '
 
 test_expect_success 'git switch - with -C and --track, complete all references' '
 	test_completion "git switch -C new-branch --track " <<-EOF
 	HEAD Z
-	master Z
+	main Z
 	matching-branch Z
 	matching-tag Z
 	other/branch-in-other Z
-	other/master-in-other Z
+	other/main-in-other Z
 	EOF
 '
 
 test_expect_success 'git switch - with -c and --no-track, complete all references' '
 	test_completion "git switch -c new-branch --no-track " <<-\EOF
 	HEAD Z
-	master Z
+	main Z
 	matching-branch Z
 	matching-tag Z
 	other/branch-in-other Z
-	other/master-in-other Z
+	other/main-in-other Z
 	EOF
 '
 
 test_expect_success 'git switch - with -C and --no-track, complete all references' '
 	test_completion "git switch -C new-branch --no-track " <<-\EOF
 	HEAD Z
-	master Z
+	main Z
 	matching-branch Z
 	matching-tag Z
 	other/branch-in-other Z
-	other/master-in-other Z
+	other/main-in-other Z
 	EOF
 '
 
 test_expect_success 'git checkout - with -b, complete all references' '
 	test_completion "git checkout -b new-branch " <<-\EOF
 	HEAD Z
-	master Z
+	main Z
 	matching-branch Z
 	matching-tag Z
 	other/branch-in-other Z
-	other/master-in-other Z
+	other/main-in-other Z
 	EOF
 '
 
 test_expect_success 'git checkout - with -B, complete all references' '
 	test_completion "git checkout -B new-branch " <<-\EOF
 	HEAD Z
-	master Z
+	main Z
 	matching-branch Z
 	matching-tag Z
 	other/branch-in-other Z
-	other/master-in-other Z
+	other/main-in-other Z
 	EOF
 '
 
 test_expect_success 'git checkout - with -b and --track, complete all references' '
 	test_completion "git checkout -b new-branch --track " <<-EOF
 	HEAD Z
-	master Z
+	main Z
 	matching-branch Z
 	matching-tag Z
 	other/branch-in-other Z
-	other/master-in-other Z
+	other/main-in-other Z
 	EOF
 '
 
 test_expect_success 'git checkout - with -B and --track, complete all references' '
 	test_completion "git checkout -B new-branch --track " <<-EOF
 	HEAD Z
-	master Z
+	main Z
 	matching-branch Z
 	matching-tag Z
 	other/branch-in-other Z
-	other/master-in-other Z
+	other/main-in-other Z
 	EOF
 '
 
 test_expect_success 'git checkout - with -b and --no-track, complete all references' '
 	test_completion "git checkout -b new-branch --no-track " <<-\EOF
 	HEAD Z
-	master Z
+	main Z
 	matching-branch Z
 	matching-tag Z
 	other/branch-in-other Z
-	other/master-in-other Z
+	other/main-in-other Z
 	EOF
 '
 
 test_expect_success 'git checkout - with -B and --no-track, complete all references' '
 	test_completion "git checkout -B new-branch --no-track " <<-\EOF
 	HEAD Z
-	master Z
+	main Z
 	matching-branch Z
 	matching-tag Z
 	other/branch-in-other Z
-	other/master-in-other Z
+	other/main-in-other Z
 	EOF
 '
 
 test_expect_success 'git switch - for -c, complete local branches and unique remote branches' '
 	test_completion "git switch -c " <<-\EOF
 	branch-in-other Z
-	master Z
-	master-in-other Z
+	main Z
+	main-in-other Z
 	matching-branch Z
 	EOF
 '
@@ -1580,36 +1982,36 @@ test_expect_success 'git switch - for -c, complete local branches and unique rem
 test_expect_success 'git switch - for -C, complete local branches and unique remote branches' '
 	test_completion "git switch -C " <<-\EOF
 	branch-in-other Z
-	master Z
-	master-in-other Z
+	main Z
+	main-in-other Z
 	matching-branch Z
 	EOF
 '
 
 test_expect_success 'git switch - for -c with --no-guess, complete local branches only' '
 	test_completion "git switch --no-guess -c " <<-\EOF
-	master Z
+	main Z
 	matching-branch Z
 	EOF
 '
 
 test_expect_success 'git switch - for -C with --no-guess, complete local branches only' '
 	test_completion "git switch --no-guess -C " <<-\EOF
-	master Z
+	main Z
 	matching-branch Z
 	EOF
 '
 
 test_expect_success 'git switch - for -c with --no-track, complete local branches only' '
 	test_completion "git switch --no-track -c " <<-\EOF
-	master Z
+	main Z
 	matching-branch Z
 	EOF
 '
 
 test_expect_success 'git switch - for -C with --no-track, complete local branches only' '
 	test_completion "git switch --no-track -C " <<-\EOF
-	master Z
+	main Z
 	matching-branch Z
 	EOF
 '
@@ -1617,8 +2019,8 @@ test_expect_success 'git switch - for -C with --no-track, complete local branche
 test_expect_success 'git checkout - for -b, complete local branches and unique remote branches' '
 	test_completion "git checkout -b " <<-\EOF
 	branch-in-other Z
-	master Z
-	master-in-other Z
+	main Z
+	main-in-other Z
 	matching-branch Z
 	EOF
 '
@@ -1626,36 +2028,36 @@ test_expect_success 'git checkout - for -b, complete local branches and unique r
 test_expect_success 'git checkout - for -B, complete local branches and unique remote branches' '
 	test_completion "git checkout -B " <<-\EOF
 	branch-in-other Z
-	master Z
-	master-in-other Z
+	main Z
+	main-in-other Z
 	matching-branch Z
 	EOF
 '
 
 test_expect_success 'git checkout - for -b with --no-guess, complete local branches only' '
 	test_completion "git checkout --no-guess -b " <<-\EOF
-	master Z
+	main Z
 	matching-branch Z
 	EOF
 '
 
 test_expect_success 'git checkout - for -B with --no-guess, complete local branches only' '
 	test_completion "git checkout --no-guess -B " <<-\EOF
-	master Z
+	main Z
 	matching-branch Z
 	EOF
 '
 
 test_expect_success 'git checkout - for -b with --no-track, complete local branches only' '
 	test_completion "git checkout --no-track -b " <<-\EOF
-	master Z
+	main Z
 	matching-branch Z
 	EOF
 '
 
 test_expect_success 'git checkout - for -B with --no-track, complete local branches only' '
 	test_completion "git checkout --no-track -B " <<-\EOF
-	master Z
+	main Z
 	matching-branch Z
 	EOF
 '
@@ -1663,14 +2065,14 @@ test_expect_success 'git checkout - for -B with --no-track, complete local branc
 test_expect_success 'git switch - with --orphan completes local branch names and unique remote branch names' '
 	test_completion "git switch --orphan " <<-\EOF
 	branch-in-other Z
-	master Z
-	master-in-other Z
+	main Z
+	main-in-other Z
 	matching-branch Z
 	EOF
 '
 
 test_expect_success 'git switch - --orphan with branch already provided completes nothing else' '
-	test_completion "git switch --orphan master " <<-\EOF
+	test_completion "git switch --orphan main " <<-\EOF
 
 	EOF
 '
@@ -1678,20 +2080,28 @@ test_expect_success 'git switch - --orphan with branch already provided complete
 test_expect_success 'git checkout - with --orphan completes local branch names and unique remote branch names' '
 	test_completion "git checkout --orphan " <<-\EOF
 	branch-in-other Z
-	master Z
-	master-in-other Z
+	main Z
+	main-in-other Z
 	matching-branch Z
 	EOF
 '
 
 test_expect_success 'git checkout - --orphan with branch already provided completes local refs for a start-point' '
-	test_completion "git checkout --orphan master " <<-\EOF
+	test_completion "git checkout --orphan main " <<-\EOF
 	HEAD Z
-	master Z
+	main Z
 	matching-branch Z
 	matching-tag Z
 	other/branch-in-other Z
-	other/master-in-other Z
+	other/main-in-other Z
+	EOF
+'
+
+test_expect_success 'git restore completes modified files' '
+	test_commit A a.file &&
+	echo B >a.file &&
+	test_completion "git restore a." <<-\EOF
+	a.file
 	EOF
 '
 
@@ -1823,6 +2233,7 @@ test_expect_success '__git_find_on_cmdline - single match' '
 	(
 		words=(git command --opt list) &&
 		cword=${#words[@]} &&
+		__git_cmd_idx=1 &&
 		__git_find_on_cmdline "add list remove" >actual
 	) &&
 	test_cmp expect actual
@@ -1833,6 +2244,7 @@ test_expect_success '__git_find_on_cmdline - multiple matches' '
 	(
 		words=(git command -o --opt remove list add) &&
 		cword=${#words[@]} &&
+		__git_cmd_idx=1 &&
 		__git_find_on_cmdline "add list remove" >actual
 	) &&
 	test_cmp expect actual
@@ -1842,6 +2254,7 @@ test_expect_success '__git_find_on_cmdline - no match' '
 	(
 		words=(git command --opt branch) &&
 		cword=${#words[@]} &&
+		__git_cmd_idx=1 &&
 		__git_find_on_cmdline "add list remove" >actual
 	) &&
 	test_must_be_empty actual
@@ -1852,6 +2265,7 @@ test_expect_success '__git_find_on_cmdline - single match with index' '
 	(
 		words=(git command --opt list) &&
 		cword=${#words[@]} &&
+		__git_cmd_idx=1 &&
 		__git_find_on_cmdline --show-idx "add list remove" >actual
 	) &&
 	test_cmp expect actual
@@ -1862,6 +2276,7 @@ test_expect_success '__git_find_on_cmdline - multiple matches with index' '
 	(
 		words=(git command -o --opt remove list add) &&
 		cword=${#words[@]} &&
+		__git_cmd_idx=1 &&
 		__git_find_on_cmdline --show-idx "add list remove" >actual
 	) &&
 	test_cmp expect actual
@@ -1871,11 +2286,23 @@ test_expect_success '__git_find_on_cmdline - no match with index' '
 	(
 		words=(git command --opt branch) &&
 		cword=${#words[@]} &&
+		__git_cmd_idx=1 &&
 		__git_find_on_cmdline --show-idx "add list remove" >actual
 	) &&
 	test_must_be_empty actual
 '
 
+test_expect_success '__git_find_on_cmdline - ignores matches before command with index' '
+	echo "6 remove" >expect &&
+	(
+		words=(git -C remove command -o --opt remove list add) &&
+		cword=${#words[@]} &&
+		__git_cmd_idx=3 &&
+		__git_find_on_cmdline --show-idx "add list remove" >actual
+	) &&
+	test_cmp expect actual
+'
+
 test_expect_success '__git_get_config_variables' '
 	cat >expect <<-EOF &&
 	name-1
@@ -2015,12 +2442,42 @@ test_expect_success 'setup for integration tests' '
 
 test_expect_success 'checkout completes ref names' '
 	test_completion "git checkout m" <<-\EOF
-	master Z
+	main Z
 	mybranch Z
 	mytag Z
 	EOF
 '
 
+test_expect_success 'checkout does not match ref names of a different case' '
+	test_completion "git checkout M" ""
+'
+
+test_expect_success 'checkout matches case insensitively with GIT_COMPLETION_IGNORE_CASE' '
+	(
+		GIT_COMPLETION_IGNORE_CASE=1 &&
+		test_completion "git checkout M" <<-\EOF
+		main Z
+		mybranch Z
+		mytag Z
+		EOF
+	)
+'
+
+test_expect_success 'checkout completes pseudo refs' '
+	test_completion "git checkout H" <<-\EOF
+	HEAD Z
+	EOF
+'
+
+test_expect_success 'checkout completes pseudo refs case insensitively with GIT_COMPLETION_IGNORE_CASE' '
+	(
+		GIT_COMPLETION_IGNORE_CASE=1 &&
+		test_completion "git checkout h" <<-\EOF
+		HEAD Z
+		EOF
+	)
+'
+
 test_expect_success 'git -C <path> checkout uses the right repo' '
 	test_completion "git -C subdir -C subsubdir -C .. -C ../otherrepo checkout b" <<-\EOF
 	branch-in-other Z
@@ -2029,7 +2486,7 @@ test_expect_success 'git -C <path> checkout uses the right repo' '
 
 test_expect_success 'show completes all refs' '
 	test_completion "git show m" <<-\EOF
-	master Z
+	main Z
 	mybranch Z
 	mytag Z
 	EOF
@@ -2066,7 +2523,10 @@ test_expect_success PERL 'send-email' '
 	--cover-from-description=Z
 	--cover-letter Z
 	EOF
-	test_completion "git send-email ma" "master "
+	test_completion "git send-email --val" <<-\EOF &&
+	--validate Z
+	EOF
+	test_completion "git send-email ma" "main "
 '
 
 test_expect_success 'complete files' '
@@ -2143,10 +2603,29 @@ test_expect_success 'complete files' '
 	test_completion "git add mom" "momified"
 '
 
+test_expect_success "simple alias" '
+	test_config alias.co checkout &&
+	test_completion "git co m" <<-\EOF
+	main Z
+	mybranch Z
+	mytag Z
+	EOF
+'
+
+test_expect_success "recursive alias" '
+	test_config alias.co checkout &&
+	test_config alias.cod "co --detached" &&
+	test_completion "git cod m" <<-\EOF
+	main Z
+	mybranch Z
+	mytag Z
+	EOF
+'
+
 test_expect_success "completion uses <cmd> completion for alias: !sh -c 'git <cmd> ...'" '
 	test_config alias.co "!sh -c '"'"'git checkout ...'"'"'" &&
 	test_completion "git co m" <<-\EOF
-	master Z
+	main Z
 	mybranch Z
 	mytag Z
 	EOF
@@ -2155,7 +2634,7 @@ test_expect_success "completion uses <cmd> completion for alias: !sh -c 'git <cm
 test_expect_success 'completion uses <cmd> completion for alias: !f () { VAR=val git <cmd> ... }' '
 	test_config alias.co "!f () { VAR=val git checkout ... ; } f" &&
 	test_completion "git co m" <<-\EOF
-	master Z
+	main Z
 	mybranch Z
 	mytag Z
 	EOF
@@ -2164,7 +2643,25 @@ test_expect_success 'completion uses <cmd> completion for alias: !f () { VAR=val
 test_expect_success 'completion used <cmd> completion for alias: !f() { : git <cmd> ; ... }' '
 	test_config alias.co "!f() { : git checkout ; if ... } f" &&
 	test_completion "git co m" <<-\EOF
-	master Z
+	main Z
+	mybranch Z
+	mytag Z
+	EOF
+'
+
+test_expect_success 'completion used <cmd> completion for alias: !f() { : <cmd> ; ... }' '
+	test_config alias.co "!f() { : checkout ; if ... } f" &&
+	test_completion "git co m" <<-\EOF
+	main Z
+	mybranch Z
+	mytag Z
+	EOF
+'
+
+test_expect_success 'completion used <cmd> completion for alias: !f() { : <cmd>; ... }' '
+	test_config alias.co "!f() { : checkout; if ... } f" &&
+	test_completion "git co m" <<-\EOF
+	main Z
 	mybranch Z
 	mytag Z
 	EOF
@@ -2195,11 +2692,12 @@ for flag in -d --delete
 do
 	test_expect_success "__git_complete_remote_or_refspec - push $flag other" '
 		sed -e "s/Z$//" >expected <<-EOF &&
-		master-in-other Z
+		main-in-other Z
 		EOF
 		(
 			words=(git push '$flag' other ma) &&
 			cword=${#words[@]} cur=${words[cword-1]} &&
+			__git_cmd_idx=1 &&
 			__git_complete_remote_or_refspec &&
 			print_comp
 		) &&
@@ -2208,11 +2706,12 @@ do
 
 	test_expect_failure "__git_complete_remote_or_refspec - push other $flag" '
 		sed -e "s/Z$//" >expected <<-EOF &&
-		master-in-other Z
+		main-in-other Z
 		EOF
 		(
 			words=(git push other '$flag' ma) &&
 			cword=${#words[@]} cur=${words[cword-1]} &&
+			__git_cmd_idx=1 &&
 			__git_complete_remote_or_refspec &&
 			print_comp
 		) &&
@@ -2227,10 +2726,53 @@ test_expect_success 'git config - section' '
 	EOF
 '
 
+test_expect_success 'git config - section include, includeIf' '
+	test_completion "git config inclu" <<-\EOF
+	include.Z
+	includeIf.Z
+	EOF
+'
+
 test_expect_success 'git config - variable name' '
 	test_completion "git config log.d" <<-\EOF
 	log.date Z
 	log.decorate Z
+	log.diffMerges Z
+	EOF
+'
+
+test_expect_success 'git config - variable name include' '
+	test_completion "git config include.p" <<-\EOF
+	include.path Z
+	EOF
+'
+
+test_expect_success 'setup for git config submodule tests' '
+	test_create_repo sub &&
+	test_commit -C sub initial &&
+	git submodule add ./sub
+'
+
+test_expect_success 'git config - variable name - submodule and __git_compute_first_level_config_vars_for_section' '
+	test_completion "git config submodule." <<-\EOF
+	submodule.active Z
+	submodule.alternateErrorStrategy Z
+	submodule.alternateLocation Z
+	submodule.fetchJobs Z
+	submodule.propagateBranches Z
+	submodule.recurse Z
+	submodule.sub.Z
+	EOF
+'
+
+test_expect_success 'git config - variable name - __git_compute_second_level_config_vars_for_section' '
+	test_completion "git config submodule.sub." <<-\EOF
+	submodule.sub.url Z
+	submodule.sub.update Z
+	submodule.sub.branch Z
+	submodule.sub.fetchRecurseSubmodules Z
+	submodule.sub.ignore Z
+	submodule.sub.active Z
 	EOF
 '
 
@@ -2252,6 +2794,7 @@ test_expect_success 'git -c - variable name' '
 	test_completion "git -c log.d" <<-\EOF
 	log.date=Z
 	log.decorate=Z
+	log.diffMerges=Z
 	EOF
 '
 
@@ -2273,6 +2816,7 @@ test_expect_success 'git clone --config= - variable name' '
 	test_completion "git clone --config=log.d" <<-\EOF
 	log.date=Z
 	log.decorate=Z
+	log.diffMerges=Z
 	EOF
 '
 
@@ -2283,29 +2827,147 @@ test_expect_success 'git clone --config= - value' '
 	EOF
 '
 
+test_expect_success 'git reflog show' '
+	test_when_finished "git checkout - && git branch -d shown" &&
+	git checkout -b shown &&
+	test_completion "git reflog sho" <<-\EOF &&
+	show Z
+	shown Z
+	EOF
+	test_completion "git reflog show sho" "shown " &&
+	test_completion "git reflog shown sho" "shown " &&
+	test_completion "git reflog --unt" "--until=" &&
+	test_completion "git reflog show --unt" "--until=" &&
+	test_completion "git reflog shown --unt" "--until="
+'
+
+test_expect_success 'options with value' '
+	test_completion "git merge -X diff-algorithm=" <<-\EOF
+
+	EOF
+'
+
 test_expect_success 'sourcing the completion script clears cached commands' '
-	__git_compute_all_commands &&
-	verbose test -n "$__git_all_commands" &&
-	. "$GIT_BUILD_DIR/contrib/completion/git-completion.bash" &&
-	verbose test -z "$__git_all_commands"
+	(
+		__git_compute_all_commands &&
+		test -n "$__git_all_commands" &&
+		. "$GIT_BUILD_DIR/contrib/completion/git-completion.bash" &&
+		test -z "$__git_all_commands"
+	)
 '
 
 test_expect_success 'sourcing the completion script clears cached merge strategies' '
-	GIT_TEST_GETTEXT_POISON=false &&
-	__git_compute_merge_strategies &&
-	verbose test -n "$__git_merge_strategies" &&
-	. "$GIT_BUILD_DIR/contrib/completion/git-completion.bash" &&
-	verbose test -z "$__git_merge_strategies"
+	(
+		__git_compute_merge_strategies &&
+		test -n "$__git_merge_strategies" &&
+		. "$GIT_BUILD_DIR/contrib/completion/git-completion.bash" &&
+		test -z "$__git_merge_strategies"
+	)
 '
 
 test_expect_success 'sourcing the completion script clears cached --options' '
-	__gitcomp_builtin checkout &&
-	verbose test -n "$__gitcomp_builtin_checkout" &&
-	__gitcomp_builtin notes_edit &&
-	verbose test -n "$__gitcomp_builtin_notes_edit" &&
-	. "$GIT_BUILD_DIR/contrib/completion/git-completion.bash" &&
-	verbose test -z "$__gitcomp_builtin_checkout" &&
-	verbose test -z "$__gitcomp_builtin_notes_edit"
+	(
+		__gitcomp_builtin checkout &&
+		test -n "$__gitcomp_builtin_checkout" &&
+		__gitcomp_builtin notes_edit &&
+		test -n "$__gitcomp_builtin_notes_edit" &&
+		. "$GIT_BUILD_DIR/contrib/completion/git-completion.bash" &&
+		test -z "$__gitcomp_builtin_checkout" &&
+		test -z "$__gitcomp_builtin_notes_edit"
+	)
+'
+
+test_expect_success 'option aliases are not shown by default' '
+	test_completion "git clone --recurs" "--recurse-submodules "
+'
+
+test_expect_success 'option aliases are shown with GIT_COMPLETION_SHOW_ALL' '
+	(
+		. "$GIT_BUILD_DIR/contrib/completion/git-completion.bash" &&
+		GIT_COMPLETION_SHOW_ALL=1 && export GIT_COMPLETION_SHOW_ALL &&
+		test_completion "git clone --recurs" <<-\EOF
+		--recurse-submodules Z
+		--recursive Z
+		EOF
+	)
+'
+
+test_expect_success 'plumbing commands are excluded without GIT_COMPLETION_SHOW_ALL_COMMANDS' '
+	(
+		. "$GIT_BUILD_DIR/contrib/completion/git-completion.bash" &&
+		sane_unset GIT_TESTING_PORCELAIN_COMMAND_LIST &&
+
+		# Just mainporcelain, not plumbing commands
+		run_completion "git c" &&
+		grep checkout out &&
+		! grep cat-file out
+	)
+'
+
+test_expect_success 'all commands are shown with GIT_COMPLETION_SHOW_ALL_COMMANDS (also main non-builtin)' '
+	(
+		. "$GIT_BUILD_DIR/contrib/completion/git-completion.bash" &&
+		GIT_COMPLETION_SHOW_ALL_COMMANDS=1 &&
+		export GIT_COMPLETION_SHOW_ALL_COMMANDS &&
+		sane_unset GIT_TESTING_PORCELAIN_COMMAND_LIST &&
+
+		# Both mainporcelain and plumbing commands
+		run_completion "git c" &&
+		grep checkout out &&
+		grep cat-file out &&
+
+		# Check "gitk", a "main" command, but not a built-in + more plumbing
+		run_completion "git g" &&
+		grep gitk out &&
+		grep get-tar-commit-id out
+	)
+'
+
+test_expect_success '__git_complete' '
+	unset -f __git_wrap__git_main &&
+
+	__git_complete foo __git_main &&
+	__git_have_func __git_wrap__git_main &&
+	unset -f __git_wrap__git_main &&
+
+	__git_complete gf _git_fetch &&
+	__git_have_func __git_wrap_git_fetch &&
+
+	__git_complete foo git &&
+	__git_have_func __git_wrap__git_main &&
+	unset -f __git_wrap__git_main &&
+
+	__git_complete gd git_diff &&
+	__git_have_func __git_wrap_git_diff &&
+
+	test_must_fail __git_complete ga missing
+'
+
+test_expect_success '__git_pseudoref_exists' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	(
+		cd repo &&
+		sane_unset __git_repo_path &&
+
+		# HEAD should exist, even if it points to an unborn branch.
+		__git_pseudoref_exists HEAD >output 2>&1 &&
+		test_must_be_empty output &&
+
+		# HEAD points to an existing branch, so it should exist.
+		test_commit A &&
+		__git_pseudoref_exists HEAD >output 2>&1 &&
+		test_must_be_empty output &&
+
+		# CHERRY_PICK_HEAD does not exist, so the existence check should fail.
+		! __git_pseudoref_exists CHERRY_PICK_HEAD >output 2>&1 &&
+		test_must_be_empty output &&
+
+		# CHERRY_PICK_HEAD points to a commit, so it should exist.
+		git update-ref CHERRY_PICK_HEAD A &&
+		__git_pseudoref_exists CHERRY_PICK_HEAD >output 2>&1 &&
+		test_must_be_empty output
+	)
 '
 
 test_done
diff --git a/t/t9903-bash-prompt.sh b/t/t9903-bash-prompt.sh
index ab5da2c..d667dda 100755
--- a/t/t9903-bash-prompt.sh
+++ b/t/t9903-bash-prompt.sh
@@ -5,15 +5,18 @@
 
 test_description='test git-specific bash prompt functions'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 . ./lib-bash.sh
 
 . "$GIT_BUILD_DIR/contrib/completion/git-prompt.sh"
 
 actual="$TRASH_DIRECTORY/actual"
-c_red='\\[\\e[31m\\]'
-c_green='\\[\\e[32m\\]'
-c_lblue='\\[\\e[1;34m\\]'
-c_clear='\\[\\e[0m\\]'
+c_red='\001\e[31m\002'
+c_green='\001\e[32m\002'
+c_lblue='\001\e[1;34m\002'
+c_clear='\001\e[0m\002'
 
 test_expect_success 'setup for prompt tests' '
 	git init otherrepo &&
@@ -28,7 +31,7 @@ test_expect_success 'setup for prompt tests' '
 	echo 3 >file &&
 	git commit -m "third b1" file &&
 	git tag -a -m msg2 t2 &&
-	git checkout -b b2 master &&
+	git checkout -b b2 main &&
 	echo 0 >file &&
 	git commit -m "second b2" file &&
 	echo 00 >file &&
@@ -37,20 +40,20 @@ test_expect_success 'setup for prompt tests' '
 	git commit -m "yet another b2" file &&
 	mkdir ignored_dir &&
 	echo "ignored_dir/" >>.gitignore &&
-	git checkout master
+	git checkout main
 '
 
 test_expect_success 'prompt - branch name' '
-	printf " (master)" >expected &&
+	printf " (main)" >expected &&
 	__git_ps1 >"$actual" &&
 	test_cmp expected "$actual"
 '
 
 test_expect_success SYMLINKS 'prompt - branch name - symlink symref' '
-	printf " (master)" >expected &&
-	test_when_finished "git checkout master" &&
+	printf " (main)" >expected &&
+	test_when_finished "git checkout main" &&
 	test_config core.preferSymlinkRefs true &&
-	git checkout master &&
+	git checkout main &&
 	__git_ps1 >"$actual" &&
 	test_cmp expected "$actual"
 '
@@ -58,7 +61,7 @@ test_expect_success SYMLINKS 'prompt - branch name - symlink symref' '
 test_expect_success 'prompt - unborn branch' '
 	printf " (unborn)" >expected &&
 	git checkout --orphan unborn &&
-	test_when_finished "git checkout master" &&
+	test_when_finished "git checkout main" &&
 	__git_ps1 >"$actual" &&
 	test_cmp expected "$actual"
 '
@@ -72,7 +75,7 @@ test_expect_success FUNNYNAMES 'prompt - with newline in path' '
 with
 newline" &&
 	mkdir "$repo_with_newline" &&
-	printf " (master)" >expected &&
+	printf " (main)" >expected &&
 	git init "$repo_with_newline" &&
 	test_when_finished "rm -rf \"$repo_with_newline\"" &&
 	mkdir "$repo_with_newline"/subdir &&
@@ -87,7 +90,7 @@ test_expect_success 'prompt - detached head' '
 	printf " ((%s...))" $(git log -1 --format="%h" --abbrev=13 b1^) >expected &&
 	test_config core.abbrev 13 &&
 	git checkout b1^ &&
-	test_when_finished "git checkout master" &&
+	test_when_finished "git checkout main" &&
 	__git_ps1 >"$actual" &&
 	test_cmp expected "$actual"
 '
@@ -95,7 +98,7 @@ test_expect_success 'prompt - detached head' '
 test_expect_success 'prompt - describe detached head - contains' '
 	printf " ((t2~1))" >expected &&
 	git checkout b1^ &&
-	test_when_finished "git checkout master" &&
+	test_when_finished "git checkout main" &&
 	(
 		GIT_PS1_DESCRIBE_STYLE=contains &&
 		__git_ps1 >"$actual"
@@ -106,7 +109,7 @@ test_expect_success 'prompt - describe detached head - contains' '
 test_expect_success 'prompt - describe detached head - branch' '
 	printf " ((tags/t2~1))" >expected &&
 	git checkout b1^ &&
-	test_when_finished "git checkout master" &&
+	test_when_finished "git checkout main" &&
 	(
 		GIT_PS1_DESCRIBE_STYLE=branch &&
 		__git_ps1 >"$actual"
@@ -117,7 +120,7 @@ test_expect_success 'prompt - describe detached head - branch' '
 test_expect_success 'prompt - describe detached head - describe' '
 	printf " ((t1-1-g%s))" $(git log -1 --format="%h" b1^) >expected &&
 	git checkout b1^ &&
-	test_when_finished "git checkout master" &&
+	test_when_finished "git checkout main" &&
 	(
 		GIT_PS1_DESCRIBE_STYLE=describe &&
 		__git_ps1 >"$actual"
@@ -128,7 +131,7 @@ test_expect_success 'prompt - describe detached head - describe' '
 test_expect_success 'prompt - describe detached head - default' '
 	printf " ((t2))" >expected &&
 	git checkout --detach b1 &&
-	test_when_finished "git checkout master" &&
+	test_when_finished "git checkout main" &&
 	__git_ps1 >"$actual" &&
 	test_cmp expected "$actual"
 '
@@ -152,7 +155,7 @@ test_expect_success 'prompt - deep inside .git directory' '
 '
 
 test_expect_success 'prompt - inside bare repository' '
-	printf " (BARE:master)" >expected &&
+	printf " (BARE:main)" >expected &&
 	git init --bare bare.git &&
 	test_when_finished "rm -rf bare.git" &&
 	(
@@ -172,7 +175,7 @@ test_expect_success 'prompt - interactive rebase' '
 	test_when_finished "rm -f fake_editor.sh" &&
 	test_set_editor "$TRASH_DIRECTORY/fake_editor.sh" &&
 	git checkout b1 &&
-	test_when_finished "git checkout master" &&
+	test_when_finished "git checkout main" &&
 	git rebase -i HEAD^ &&
 	test_when_finished "git rebase --abort" &&
 	__git_ps1 >"$actual" &&
@@ -182,7 +185,7 @@ test_expect_success 'prompt - interactive rebase' '
 test_expect_success 'prompt - rebase merge' '
 	printf " (b2|REBASE 1/3)" >expected &&
 	git checkout b2 &&
-	test_when_finished "git checkout master" &&
+	test_when_finished "git checkout main" &&
 	test_must_fail git rebase --merge b1 b2 &&
 	test_when_finished "git rebase --abort" &&
 	__git_ps1 >"$actual" &&
@@ -192,7 +195,7 @@ test_expect_success 'prompt - rebase merge' '
 test_expect_success 'prompt - rebase am' '
 	printf " (b2|REBASE 1/3)" >expected &&
 	git checkout b2 &&
-	test_when_finished "git checkout master" &&
+	test_when_finished "git checkout main" &&
 	test_must_fail git rebase --apply b1 b2 &&
 	test_when_finished "git rebase --abort" &&
 	__git_ps1 >"$actual" &&
@@ -202,7 +205,7 @@ test_expect_success 'prompt - rebase am' '
 test_expect_success 'prompt - merge' '
 	printf " (b1|MERGING)" >expected &&
 	git checkout b1 &&
-	test_when_finished "git checkout master" &&
+	test_when_finished "git checkout main" &&
 	test_must_fail git merge b2 &&
 	test_when_finished "git reset --hard" &&
 	__git_ps1 >"$actual" &&
@@ -210,7 +213,7 @@ test_expect_success 'prompt - merge' '
 '
 
 test_expect_success 'prompt - cherry-pick' '
-	printf " (master|CHERRY-PICKING)" >expected &&
+	printf " (main|CHERRY-PICKING)" >expected &&
 	test_must_fail git cherry-pick b1 b1^ &&
 	test_when_finished "git cherry-pick --abort" &&
 	__git_ps1 >"$actual" &&
@@ -222,7 +225,7 @@ test_expect_success 'prompt - cherry-pick' '
 '
 
 test_expect_success 'prompt - revert' '
-	printf " (master|REVERTING)" >expected &&
+	printf " (main|REVERTING)" >expected &&
 	test_must_fail git revert b1^ b1 &&
 	test_when_finished "git revert --abort" &&
 	__git_ps1 >"$actual" &&
@@ -234,7 +237,7 @@ test_expect_success 'prompt - revert' '
 '
 
 test_expect_success 'prompt - bisect' '
-	printf " (master|BISECTING)" >expected &&
+	printf " (main|BISECTING)" >expected &&
 	git bisect start &&
 	test_when_finished "git bisect reset" &&
 	__git_ps1 >"$actual" &&
@@ -242,7 +245,7 @@ test_expect_success 'prompt - bisect' '
 '
 
 test_expect_success 'prompt - dirty status indicator - clean' '
-	printf " (master)" >expected &&
+	printf " (main)" >expected &&
 	(
 		GIT_PS1_SHOWDIRTYSTATE=y &&
 		__git_ps1 >"$actual"
@@ -251,7 +254,7 @@ test_expect_success 'prompt - dirty status indicator - clean' '
 '
 
 test_expect_success 'prompt - dirty status indicator - dirty worktree' '
-	printf " (master *)" >expected &&
+	printf " (main *)" >expected &&
 	echo "dirty" >file &&
 	test_when_finished "git reset --hard" &&
 	(
@@ -262,7 +265,7 @@ test_expect_success 'prompt - dirty status indicator - dirty worktree' '
 '
 
 test_expect_success 'prompt - dirty status indicator - dirty index' '
-	printf " (master +)" >expected &&
+	printf " (main +)" >expected &&
 	echo "dirty" >file &&
 	test_when_finished "git reset --hard" &&
 	git add -u &&
@@ -274,7 +277,7 @@ test_expect_success 'prompt - dirty status indicator - dirty index' '
 '
 
 test_expect_success 'prompt - dirty status indicator - dirty index and worktree' '
-	printf " (master *+)" >expected &&
+	printf " (main *+)" >expected &&
 	echo "dirty index" >file &&
 	test_when_finished "git reset --hard" &&
 	git add -u &&
@@ -288,7 +291,7 @@ test_expect_success 'prompt - dirty status indicator - dirty index and worktree'
 
 test_expect_success 'prompt - dirty status indicator - orphan branch - clean' '
 	printf " (orphan #)" >expected &&
-	test_when_finished "git checkout master" &&
+	test_when_finished "git checkout main" &&
 	git checkout --orphan orphan &&
 	git reset --hard &&
 	(
@@ -300,7 +303,7 @@ test_expect_success 'prompt - dirty status indicator - orphan branch - clean' '
 
 test_expect_success 'prompt - dirty status indicator - orphan branch - dirty index' '
 	printf " (orphan +)" >expected &&
-	test_when_finished "git checkout master" &&
+	test_when_finished "git checkout main" &&
 	git checkout --orphan orphan &&
 	(
 		GIT_PS1_SHOWDIRTYSTATE=y &&
@@ -311,7 +314,7 @@ test_expect_success 'prompt - dirty status indicator - orphan branch - dirty ind
 
 test_expect_success 'prompt - dirty status indicator - orphan branch - dirty index and worktree' '
 	printf " (orphan *+)" >expected &&
-	test_when_finished "git checkout master" &&
+	test_when_finished "git checkout main" &&
 	git checkout --orphan orphan &&
 	>file &&
 	(
@@ -322,7 +325,7 @@ test_expect_success 'prompt - dirty status indicator - orphan branch - dirty ind
 '
 
 test_expect_success 'prompt - dirty status indicator - shell variable unset with config disabled' '
-	printf " (master)" >expected &&
+	printf " (main)" >expected &&
 	echo "dirty" >file &&
 	test_when_finished "git reset --hard" &&
 	test_config bash.showDirtyState false &&
@@ -334,7 +337,7 @@ test_expect_success 'prompt - dirty status indicator - shell variable unset with
 '
 
 test_expect_success 'prompt - dirty status indicator - shell variable unset with config enabled' '
-	printf " (master)" >expected &&
+	printf " (main)" >expected &&
 	echo "dirty" >file &&
 	test_when_finished "git reset --hard" &&
 	test_config bash.showDirtyState true &&
@@ -346,7 +349,7 @@ test_expect_success 'prompt - dirty status indicator - shell variable unset with
 '
 
 test_expect_success 'prompt - dirty status indicator - shell variable set with config disabled' '
-	printf " (master)" >expected &&
+	printf " (main)" >expected &&
 	echo "dirty" >file &&
 	test_when_finished "git reset --hard" &&
 	test_config bash.showDirtyState false &&
@@ -358,7 +361,7 @@ test_expect_success 'prompt - dirty status indicator - shell variable set with c
 '
 
 test_expect_success 'prompt - dirty status indicator - shell variable set with config enabled' '
-	printf " (master *)" >expected &&
+	printf " (main *)" >expected &&
 	echo "dirty" >file &&
 	test_when_finished "git reset --hard" &&
 	test_config bash.showDirtyState true &&
@@ -382,7 +385,7 @@ test_expect_success 'prompt - dirty status indicator - not shown inside .git dir
 '
 
 test_expect_success 'prompt - stash status indicator - no stash' '
-	printf " (master)" >expected &&
+	printf " (main)" >expected &&
 	(
 		GIT_PS1_SHOWSTASHSTATE=y &&
 		__git_ps1 >"$actual"
@@ -391,7 +394,7 @@ test_expect_success 'prompt - stash status indicator - no stash' '
 '
 
 test_expect_success 'prompt - stash status indicator - stash' '
-	printf " (master $)" >expected &&
+	printf " (main $)" >expected &&
 	echo 2 >file &&
 	git stash &&
 	test_when_finished "git stash drop" &&
@@ -417,7 +420,7 @@ test_expect_success 'prompt - stash status indicator - not shown inside .git dir
 '
 
 test_expect_success 'prompt - untracked files status indicator - no untracked files' '
-	printf " (master)" >expected &&
+	printf " (main)" >expected &&
 	(
 		GIT_PS1_SHOWUNTRACKEDFILES=y &&
 		cd otherrepo &&
@@ -427,7 +430,7 @@ test_expect_success 'prompt - untracked files status indicator - no untracked fi
 '
 
 test_expect_success 'prompt - untracked files status indicator - untracked files' '
-	printf " (master %%)" >expected &&
+	printf " (main %%)" >expected &&
 	(
 		GIT_PS1_SHOWUNTRACKEDFILES=y &&
 		__git_ps1 >"$actual"
@@ -436,7 +439,7 @@ test_expect_success 'prompt - untracked files status indicator - untracked files
 '
 
 test_expect_success 'prompt - untracked files status indicator - empty untracked dir' '
-	printf " (master)" >expected &&
+	printf " (main)" >expected &&
 	mkdir otherrepo/untracked-dir &&
 	test_when_finished "rm -rf otherrepo/untracked-dir" &&
 	(
@@ -448,7 +451,7 @@ test_expect_success 'prompt - untracked files status indicator - empty untracked
 '
 
 test_expect_success 'prompt - untracked files status indicator - non-empty untracked dir' '
-	printf " (master %%)" >expected &&
+	printf " (main %%)" >expected &&
 	mkdir otherrepo/untracked-dir &&
 	test_when_finished "rm -rf otherrepo/untracked-dir" &&
 	>otherrepo/untracked-dir/untracked-file &&
@@ -461,7 +464,7 @@ test_expect_success 'prompt - untracked files status indicator - non-empty untra
 '
 
 test_expect_success 'prompt - untracked files status indicator - untracked files outside cwd' '
-	printf " (master %%)" >expected &&
+	printf " (main %%)" >expected &&
 	(
 		mkdir -p ignored_dir &&
 		cd ignored_dir &&
@@ -472,7 +475,7 @@ test_expect_success 'prompt - untracked files status indicator - untracked files
 '
 
 test_expect_success 'prompt - untracked files status indicator - shell variable unset with config disabled' '
-	printf " (master)" >expected &&
+	printf " (main)" >expected &&
 	test_config bash.showUntrackedFiles false &&
 	(
 		sane_unset GIT_PS1_SHOWUNTRACKEDFILES &&
@@ -482,7 +485,7 @@ test_expect_success 'prompt - untracked files status indicator - shell variable
 '
 
 test_expect_success 'prompt - untracked files status indicator - shell variable unset with config enabled' '
-	printf " (master)" >expected &&
+	printf " (main)" >expected &&
 	test_config bash.showUntrackedFiles true &&
 	(
 		sane_unset GIT_PS1_SHOWUNTRACKEDFILES &&
@@ -492,7 +495,7 @@ test_expect_success 'prompt - untracked files status indicator - shell variable
 '
 
 test_expect_success 'prompt - untracked files status indicator - shell variable set with config disabled' '
-	printf " (master)" >expected &&
+	printf " (main)" >expected &&
 	test_config bash.showUntrackedFiles false &&
 	(
 		GIT_PS1_SHOWUNTRACKEDFILES=y &&
@@ -502,7 +505,7 @@ test_expect_success 'prompt - untracked files status indicator - shell variable
 '
 
 test_expect_success 'prompt - untracked files status indicator - shell variable set with config enabled' '
-	printf " (master %%)" >expected &&
+	printf " (main %%)" >expected &&
 	test_config bash.showUntrackedFiles true &&
 	(
 		GIT_PS1_SHOWUNTRACKEDFILES=y &&
@@ -522,13 +525,13 @@ test_expect_success 'prompt - untracked files status indicator - not shown insid
 '
 
 test_expect_success 'prompt - format string starting with dash' '
-	printf -- "-master" >expected &&
+	printf -- "-main" >expected &&
 	__git_ps1 "-%s" >"$actual" &&
 	test_cmp expected "$actual"
 '
 
 test_expect_success 'prompt - pc mode' '
-	printf "BEFORE: (\${__git_ps1_branch_name}):AFTER\\nmaster" >expected &&
+	printf "BEFORE: (\${__git_ps1_branch_name}):AFTER\\nmain" >expected &&
 	(
 		__git_ps1 "BEFORE:" ":AFTER" >"$actual" &&
 		test_must_be_empty "$actual" &&
@@ -538,7 +541,7 @@ test_expect_success 'prompt - pc mode' '
 '
 
 test_expect_success 'prompt - bash color pc mode - branch name' '
-	printf "BEFORE: (${c_green}\${__git_ps1_branch_name}${c_clear}):AFTER\\nmaster" >expected &&
+	printf "BEFORE: (${c_green}\${__git_ps1_branch_name}${c_clear}):AFTER\\nmain" >expected &&
 	(
 		GIT_PS1_SHOWCOLORHINTS=y &&
 		__git_ps1 "BEFORE:" ":AFTER" >"$actual" &&
@@ -550,7 +553,7 @@ test_expect_success 'prompt - bash color pc mode - branch name' '
 test_expect_success 'prompt - bash color pc mode - detached head' '
 	printf "BEFORE: (${c_red}\${__git_ps1_branch_name}${c_clear}):AFTER\\n(%s...)" $(git log -1 --format="%h" b1^) >expected &&
 	git checkout b1^ &&
-	test_when_finished "git checkout master" &&
+	test_when_finished "git checkout main" &&
 	(
 		GIT_PS1_SHOWCOLORHINTS=y &&
 		__git_ps1 "BEFORE:" ":AFTER" &&
@@ -560,7 +563,7 @@ test_expect_success 'prompt - bash color pc mode - detached head' '
 '
 
 test_expect_success 'prompt - bash color pc mode - dirty status indicator - dirty worktree' '
-	printf "BEFORE: (${c_green}\${__git_ps1_branch_name}${c_clear} ${c_red}*${c_clear}):AFTER\\nmaster" >expected &&
+	printf "BEFORE: (${c_green}\${__git_ps1_branch_name}${c_clear} ${c_red}*${c_clear}):AFTER\\nmain" >expected &&
 	echo "dirty" >file &&
 	test_when_finished "git reset --hard" &&
 	(
@@ -573,7 +576,7 @@ test_expect_success 'prompt - bash color pc mode - dirty status indicator - dirt
 '
 
 test_expect_success 'prompt - bash color pc mode - dirty status indicator - dirty index' '
-	printf "BEFORE: (${c_green}\${__git_ps1_branch_name}${c_clear} ${c_green}+${c_clear}):AFTER\\nmaster" >expected &&
+	printf "BEFORE: (${c_green}\${__git_ps1_branch_name}${c_clear} ${c_green}+${c_clear}):AFTER\\nmain" >expected &&
 	echo "dirty" >file &&
 	test_when_finished "git reset --hard" &&
 	git add -u &&
@@ -587,7 +590,7 @@ test_expect_success 'prompt - bash color pc mode - dirty status indicator - dirt
 '
 
 test_expect_success 'prompt - bash color pc mode - dirty status indicator - dirty index and worktree' '
-	printf "BEFORE: (${c_green}\${__git_ps1_branch_name}${c_clear} ${c_red}*${c_green}+${c_clear}):AFTER\\nmaster" >expected &&
+	printf "BEFORE: (${c_green}\${__git_ps1_branch_name}${c_clear} ${c_red}*${c_clear}${c_green}+${c_clear}):AFTER\\nmain" >expected &&
 	echo "dirty index" >file &&
 	test_when_finished "git reset --hard" &&
 	git add -u &&
@@ -602,7 +605,7 @@ test_expect_success 'prompt - bash color pc mode - dirty status indicator - dirt
 '
 
 test_expect_success 'prompt - bash color pc mode - dirty status indicator - before root commit' '
-	printf "BEFORE: (${c_green}\${__git_ps1_branch_name}${c_clear} ${c_green}#${c_clear}):AFTER\\nmaster" >expected &&
+	printf "BEFORE: (${c_green}\${__git_ps1_branch_name}${c_clear} ${c_green}#${c_clear}):AFTER\\nmain" >expected &&
 	(
 		GIT_PS1_SHOWDIRTYSTATE=y &&
 		GIT_PS1_SHOWCOLORHINTS=y &&
@@ -628,7 +631,7 @@ test_expect_success 'prompt - bash color pc mode - inside .git directory' '
 '
 
 test_expect_success 'prompt - bash color pc mode - stash status indicator' '
-	printf "BEFORE: (${c_green}\${__git_ps1_branch_name}${c_clear} ${c_lblue}\$${c_clear}):AFTER\\nmaster" >expected &&
+	printf "BEFORE: (${c_green}\${__git_ps1_branch_name}${c_clear} ${c_lblue}\$${c_clear}):AFTER\\nmain" >expected &&
 	echo 2 >file &&
 	git stash &&
 	test_when_finished "git stash drop" &&
@@ -642,7 +645,7 @@ test_expect_success 'prompt - bash color pc mode - stash status indicator' '
 '
 
 test_expect_success 'prompt - bash color pc mode - untracked files status indicator' '
-	printf "BEFORE: (${c_green}\${__git_ps1_branch_name}${c_clear} ${c_red}%%${c_clear}):AFTER\\nmaster" >expected &&
+	printf "BEFORE: (${c_green}\${__git_ps1_branch_name}${c_clear} ${c_red}%%${c_clear}):AFTER\\nmain" >expected &&
 	(
 		GIT_PS1_SHOWUNTRACKEDFILES=y &&
 		GIT_PS1_SHOWCOLORHINTS=y &&
@@ -653,7 +656,7 @@ test_expect_success 'prompt - bash color pc mode - untracked files status indica
 '
 
 test_expect_success 'prompt - zsh color pc mode' '
-	printf "BEFORE: (%%F{green}master%%f):AFTER" >expected &&
+	printf "BEFORE: (%%F{green}main%%f):AFTER" >expected &&
 	(
 		ZSH_VERSION=5.0.0 &&
 		GIT_PS1_SHOWCOLORHINTS=y &&
@@ -664,7 +667,7 @@ test_expect_success 'prompt - zsh color pc mode' '
 '
 
 test_expect_success 'prompt - hide if pwd ignored - env var unset, config disabled' '
-	printf " (master)" >expected &&
+	printf " (main)" >expected &&
 	test_config bash.hideIfPwdIgnored false &&
 	(
 		cd ignored_dir &&
@@ -685,7 +688,7 @@ test_expect_success 'prompt - hide if pwd ignored - env var unset, config disabl
 '
 
 test_expect_success 'prompt - hide if pwd ignored - env var unset, config unset' '
-	printf " (master)" >expected &&
+	printf " (main)" >expected &&
 	(
 		cd ignored_dir &&
 		__git_ps1 >"$actual"
@@ -704,7 +707,7 @@ test_expect_success 'prompt - hide if pwd ignored - env var unset, config unset,
 '
 
 test_expect_success 'prompt - hide if pwd ignored - env var set, config disabled' '
-	printf " (master)" >expected &&
+	printf " (main)" >expected &&
 	test_config bash.hideIfPwdIgnored false &&
 	(
 		cd ignored_dir &&
@@ -756,4 +759,20 @@ test_expect_success 'prompt - hide if pwd ignored - inside gitdir' '
 	test_cmp expected "$actual"
 '
 
+test_expect_success 'prompt - conflict indicator' '
+	printf " (main|CONFLICT)" >expected &&
+	echo "stash" >file &&
+	git stash &&
+	test_when_finished "git stash drop" &&
+	echo "commit" >file &&
+	git commit -m "commit" file &&
+	test_when_finished "git reset --hard HEAD~" &&
+	test_must_fail git stash apply &&
+	(
+		GIT_PS1_SHOWCONFLICTSTATE="yes" &&
+		__git_ps1 >"$actual"
+	) &&
+	test_cmp expected "$actual"
+'
+
 test_done
diff --git a/t/test-lib-functions.sh b/t/test-lib-functions.sh
index 596c549..862d80c 100644
--- a/t/test-lib-functions.sh
+++ b/t/test-lib-functions.sh
@@ -14,7 +14,7 @@
 # GNU General Public License for more details.
 #
 # You should have received a copy of the GNU General Public License
-# along with this program.  If not, see http://www.gnu.org/licenses/ .
+# along with this program.  If not, see https://www.gnu.org/licenses/ .
 
 # The semantics of the editor variables are that of invoking
 # sh -c "$EDITOR \"$@\"" files ...
@@ -32,9 +32,12 @@ test_set_editor () {
 	export EDITOR
 }
 
-test_set_index_version () {
-    GIT_INDEX_VERSION="$1"
-    export GIT_INDEX_VERSION
+# Like test_set_editor but sets GIT_SEQUENCE_EDITOR instead of EDITOR
+test_set_sequence_editor () {
+	FAKE_SEQUENCE_EDITOR="$1"
+	export FAKE_SEQUENCE_EDITOR
+	GIT_SEQUENCE_EDITOR='"$FAKE_SEQUENCE_EDITOR"'
+	export GIT_SEQUENCE_EDITOR
 }
 
 test_decode_color () {
@@ -116,13 +119,6 @@ remove_cr () {
 	tr '\015' Q | sed -e 's/Q$//'
 }
 
-# Generate an output of $1 bytes of all zeroes (NULs, not ASCII zeroes).
-# If $1 is 'infinity', output forever or until the receiving pipe stops reading,
-# whichever comes first.
-generate_zero_bytes () {
-	test-tool genzeros "$@"
-}
-
 # In some bourne shell implementations, the "unset" builtin returns
 # nonzero status when a variable to be unset was not set in the first
 # place.
@@ -149,63 +145,239 @@ test_tick () {
 # Stop execution and start a shell. This is useful for debugging tests.
 #
 # Be sure to remove all invocations of this command before submitting.
+# WARNING: the shell invoked by this helper does not have the same environment
+# as the one running the tests (shell variables and functions are not
+# available, and the options below further modify the environment). As such,
+# commands copied from a test script might behave differently than when
+# running the test.
+#
+# Usage: test_pause [options]
+#   -t
+#	Use your original TERM instead of test-lib.sh's "dumb".
+#	This usually restores color output in the invoked shell.
+#   -s
+#	Invoke $SHELL instead of $TEST_SHELL_PATH.
+#   -h
+#	Use your original HOME instead of test-lib.sh's "$TRASH_DIRECTORY".
+#	This allows you to use your regular shell environment and Git aliases.
+#	CAUTION: running commands copied from a test script into the paused shell
+#	might result in files in your HOME being overwritten.
+#   -a
+#	Shortcut for -t -s -h
 
 test_pause () {
-	"$SHELL_PATH" <&6 >&5 2>&7
+	PAUSE_TERM=$TERM &&
+	PAUSE_SHELL=$TEST_SHELL_PATH &&
+	PAUSE_HOME=$HOME &&
+	while test $# != 0
+	do
+		case "$1" in
+		-t)
+			PAUSE_TERM="$USER_TERM"
+			;;
+		-s)
+			PAUSE_SHELL="$SHELL"
+			;;
+		-h)
+			PAUSE_HOME="$USER_HOME"
+			;;
+		-a)
+			PAUSE_TERM="$USER_TERM"
+			PAUSE_SHELL="$SHELL"
+			PAUSE_HOME="$USER_HOME"
+			;;
+		*)
+			break
+			;;
+		esac
+		shift
+	done &&
+	TERM="$PAUSE_TERM" HOME="$PAUSE_HOME" "$PAUSE_SHELL" <&6 >&5 2>&7
 }
 
 # Wrap git with a debugger. Adding this to a command can make it easier
 # to understand what is going on in a failing test.
 #
+# Usage: debug [options] <git command>
+#   -d <debugger>
+#   --debugger=<debugger>
+#	Use <debugger> instead of GDB
+#   -t
+#	Use your original TERM instead of test-lib.sh's "dumb".
+#	This usually restores color output in the debugger.
+#	WARNING: the command being debugged might behave differently than when
+#	running the test.
+#
 # Examples:
 #     debug git checkout master
 #     debug --debugger=nemiver git $ARGS
 #     debug -d "valgrind --tool=memcheck --track-origins=yes" git $ARGS
 debug () {
-	case "$1" in
-	-d)
-		GIT_DEBUGGER="$2" &&
-		shift 2
+	GIT_DEBUGGER=1 &&
+	DEBUG_TERM=$TERM &&
+	while test $# != 0
+	do
+		case "$1" in
+		-t)
+			DEBUG_TERM="$USER_TERM"
+			;;
+		-d)
+			GIT_DEBUGGER="$2" &&
+			shift
+			;;
+		--debugger=*)
+			GIT_DEBUGGER="${1#*=}"
+			;;
+		*)
+			break
+			;;
+		esac
+		shift
+	done &&
+
+	dotfiles=".gdbinit .lldbinit"
+
+	for dotfile in $dotfiles
+	do
+		dotfile="$USER_HOME/$dotfile" &&
+		test -f "$dotfile" && cp "$dotfile" "$HOME" || :
+	done &&
+
+	TERM="$DEBUG_TERM" GIT_DEBUGGER="${GIT_DEBUGGER}" "$@" <&6 >&5 2>&7 &&
+
+	for dotfile in $dotfiles
+	do
+		rm -f "$HOME/$dotfile"
+	done
+}
+
+# Usage: test_ref_exists [options] <ref>
+#
+#   -C <dir>:
+#      Run all git commands in directory <dir>
+#
+# This helper function checks whether a reference exists. Symrefs or object IDs
+# will not be resolved. Can be used to check references with bad names.
+test_ref_exists () {
+	local indir=
+
+	while test $# != 0
+	do
+		case "$1" in
+		-C)
+			indir="$2"
+			shift
+			;;
+		*)
+			break
+			;;
+		esac
+		shift
+	done &&
+
+	indir=${indir:+"$indir"/} &&
+
+	if test "$#" != 1
+	then
+		BUG "expected exactly one reference"
+	fi &&
+
+	git ${indir:+ -C "$indir"} show-ref --exists "$1"
+}
+
+# Behaves the same as test_ref_exists, except that it checks for the absence of
+# a reference. This is preferable to `! test_ref_exists` as this function is
+# able to distinguish actually-missing references from other, generic errors.
+test_ref_missing () {
+	test_ref_exists "$@"
+	case "$?" in
+	2)
+		# This is the good case.
+		return 0
 		;;
-	--debugger=*)
-		GIT_DEBUGGER="${1#*=}" &&
-		shift 1
+	0)
+		echo >&4 "test_ref_missing: reference exists"
+		return 1
 		;;
 	*)
-		GIT_DEBUGGER=1
+		echo >&4 "test_ref_missing: generic error"
+		return 1
 		;;
-	esac &&
-	GIT_DEBUGGER="${GIT_DEBUGGER}" "$@" <&6 >&5 2>&7
+	esac
 }
 
-# Call test_commit with the arguments
-# [-C <directory>] <message> [<file> [<contents> [<tag>]]]"
+# Usage: test_commit [options] <message> [<file> [<contents> [<tag>]]]
+#   -C <dir>:
+#	Run all git commands in directory <dir>
+#   --notick
+#	Do not call test_tick before making a commit
+#   --append
+#	Use ">>" instead of ">" when writing "<contents>" to "<file>"
+#   --printf
+#       Use "printf" instead of "echo" when writing "<contents>" to
+#       "<file>", use this to write escape sequences such as "\0", a
+#       trailing "\n" won't be added automatically. This option
+#       supports nothing but the FORMAT of printf(1), i.e. no custom
+#       ARGUMENT(s).
+#   --signoff
+#	Invoke "git commit" with --signoff
+#   --author <author>
+#	Invoke "git commit" with --author <author>
+#   --no-tag
+#	Do not tag the resulting commit
+#   --annotate
+#	Create an annotated tag with "--annotate -m <message>". Calls
+#	test_tick between making the commit and tag, unless --notick
+#	is given.
 #
 # This will commit a file with the given contents and the given commit
 # message, and tag the resulting commit with the given tag name.
 #
 # <file>, <contents>, and <tag> all default to <message>.
-#
-# If the first argument is "-C", the second argument is used as a path for
-# the git invocations.
 
 test_commit () {
-	notick= &&
-	signoff= &&
-	indir= &&
+	local notick= &&
+	local echo=echo &&
+	local append= &&
+	local author= &&
+	local signoff= &&
+	local indir= &&
+	local tag=light &&
 	while test $# != 0
 	do
 		case "$1" in
 		--notick)
 			notick=yes
 			;;
+		--printf)
+			echo=printf
+			;;
+		--append)
+			append=yes
+			;;
+		--author)
+			author="$2"
+			shift
+			;;
 		--signoff)
 			signoff="$1"
 			;;
+		--date)
+			notick=yes
+			GIT_COMMITTER_DATE="$2"
+			GIT_AUTHOR_DATE="$2"
+			shift
+			;;
 		-C)
 			indir="$2"
 			shift
 			;;
+		--no-tag)
+			tag=none
+			;;
+		--annotate)
+			tag=annotate
+			;;
 		*)
 			break
 			;;
@@ -213,15 +385,35 @@ test_commit () {
 		shift
 	done &&
 	indir=${indir:+"$indir"/} &&
-	file=${2:-"$1.t"} &&
-	echo "${3-$1}" > "$indir$file" &&
-	git ${indir:+ -C "$indir"} add "$file" &&
+	local file="${2:-"$1.t"}" &&
+	if test -n "$append"
+	then
+		$echo "${3-$1}" >>"$indir$file"
+	else
+		$echo "${3-$1}" >"$indir$file"
+	fi &&
+	git ${indir:+ -C "$indir"} add -- "$file" &&
 	if test -z "$notick"
 	then
 		test_tick
 	fi &&
-	git ${indir:+ -C "$indir"} commit $signoff -m "$1" &&
-	git ${indir:+ -C "$indir"} tag "${4:-$1}"
+	git ${indir:+ -C "$indir"} commit \
+	    ${author:+ --author "$author"} \
+	    $signoff -m "$1" &&
+	case "$tag" in
+	none)
+		;;
+	light)
+		git ${indir:+ -C "$indir"} tag "${4:-$1}"
+		;;
+	annotate)
+		if test -z "$notick"
+		then
+			test_tick
+		fi &&
+		git ${indir:+ -C "$indir"} tag -a -m "$1" "${4:-$1}"
+		;;
+	esac
 }
 
 # Call test_merge with the arguments "<message> <commit>", where <commit>
@@ -367,9 +559,14 @@ test_chmod () {
 	git update-index --add "--chmod=$@"
 }
 
-# Get the modebits from a file.
+# Get the modebits from a file or directory, ignoring the setgid bit (g+s).
+# This bit is inherited by subdirectories at their creation. So we remove it
+# from the returning string to prevent callers from having to worry about the
+# state of the bit in the test directory.
+#
 test_modebits () {
-	ls -l "$1" | sed -e 's|^\(..........\).*|\1|'
+	ls -ld "$1" | sed -e 's|^\(..........\).*|\1|' \
+			  -e 's|^\(......\)S|\1-|' -e 's|^\(......\)s|\1x|'
 }
 
 # Unset a configuration variable, but don't fail if it doesn't exist.
@@ -400,8 +597,17 @@ test_config () {
 		config_dir=$1
 		shift
 	fi
-	test_when_finished "test_unconfig ${config_dir:+-C '$config_dir'} '$1'" &&
-	git ${config_dir:+-C "$config_dir"} config "$@"
+
+	# If --worktree is provided, use it to configure/unconfigure
+	is_worktree=
+	if test "$1" = --worktree
+	then
+		is_worktree=1
+		shift
+	fi
+
+	test_when_finished "test_unconfig ${config_dir:+-C '$config_dir'} ${is_worktree:+--worktree} '$1'" &&
+	git ${config_dir:+-C "$config_dir"} config ${is_worktree:+--worktree} "$@"
 }
 
 test_config_global () {
@@ -417,13 +623,89 @@ write_script () {
 	chmod +x "$1"
 }
 
+# Usage: test_hook [options] <hook-name> <<-\EOF
+#
+#   -C <dir>:
+#	Run all git commands in directory <dir>
+#   --setup
+#	Setup a hook for subsequent tests, i.e. don't remove it in a
+#	"test_when_finished"
+#   --clobber
+#	Overwrite an existing <hook-name>, if it exists. Implies
+#	--setup (i.e. the "test_when_finished" is assumed to have been
+#	set up already).
+#    --disable
+#	Disable (chmod -x) an existing <hook-name>, which must exist.
+#    --remove
+#	Remove (rm -f) an existing <hook-name>, which must exist.
+test_hook () {
+	setup= &&
+	clobber= &&
+	disable= &&
+	remove= &&
+	indir= &&
+	while test $# != 0
+	do
+		case "$1" in
+		-C)
+			indir="$2" &&
+			shift
+			;;
+		--setup)
+			setup=t
+			;;
+		--clobber)
+			clobber=t
+			;;
+		--disable)
+			disable=t
+			;;
+		--remove)
+			remove=t
+			;;
+		-*)
+			BUG "invalid argument: $1"
+			;;
+		*)
+			break
+			;;
+		esac &&
+		shift
+	done &&
+
+	git_dir=$(git -C "$indir" rev-parse --absolute-git-dir) &&
+	hook_dir="$git_dir/hooks" &&
+	hook_file="$hook_dir/$1" &&
+	if test -n "$disable$remove"
+	then
+		test_path_is_file "$hook_file" &&
+		if test -n "$disable"
+		then
+			chmod -x "$hook_file"
+		elif test -n "$remove"
+		then
+			rm -f "$hook_file"
+		fi &&
+		return 0
+	fi &&
+	if test -z "$clobber"
+	then
+		test_path_is_missing "$hook_file"
+	fi &&
+	if test -z "$setup$clobber"
+	then
+		test_when_finished "rm \"$hook_file\""
+	fi &&
+	write_script "$hook_file"
+}
+
 # Use test_set_prereq to tell that a particular prerequisite is available.
 # The prerequisite can later be checked for in two ways:
 #
 # - Explicitly using test_have_prereq.
 #
 # - Implicitly by specifying the prerequisite tag in the calls to
-#   test_expect_{success,failure,code}.
+#   test_expect_{success,failure}
 #
 # The single parameter is the prerequisite tag (a simple word, in all
 # capital letters by convention).
@@ -441,8 +723,7 @@ test_set_prereq () {
 		# test_unset_prereq()
 		!*)
 			;;
-		# (Temporary?) whitelist of things we can't easily
-		# pretend not to support
+		# List of things we can't easily pretend to not support
 		SYMLINKS)
 			;;
 		# Inspecting whether GIT_TEST_FAIL_PREREQS is on
@@ -474,15 +755,15 @@ test_lazy_prereq () {
 
 test_run_lazy_prereq_ () {
 	script='
-mkdir -p "$TRASH_DIRECTORY/prereq-test-dir" &&
+mkdir -p "$TRASH_DIRECTORY/prereq-test-dir-'"$1"'" &&
 (
-	cd "$TRASH_DIRECTORY/prereq-test-dir" &&'"$2"'
+	cd "$TRASH_DIRECTORY/prereq-test-dir-'"$1"'" &&'"$2"'
 )'
 	say >&3 "checking prerequisite: $1"
 	say >&3 "$script"
 	test_eval_ "$script"
 	eval_ret=$?
-	rm -rf "$TRASH_DIRECTORY/prereq-test-dir"
+	rm -rf "$TRASH_DIRECTORY/prereq-test-dir-$1"
 	if test "$eval_ret" = 0; then
 		say >&3 "prerequisite $1 ok"
 	else
@@ -546,6 +827,17 @@ test_have_prereq () {
 			# Keep a list of missing prerequisites; restore
 			# the negative marker if necessary.
 			prerequisite=${negative_prereq:+!}$prerequisite
+
+			# Abort if this prereq was marked as required
+			if test -n "$GIT_TEST_REQUIRE_PREREQ"
+			then
+				case " $GIT_TEST_REQUIRE_PREREQ " in
+				*" $prerequisite "*)
+					BAIL_OUT "required prereq $prerequisite failed"
+					;;
+				esac
+			fi
+
 			if test -z "$missing_prereq"
 			then
 				missing_prereq=$prerequisite
@@ -574,7 +866,7 @@ test_verify_prereq () {
 }
 
 test_expect_failure () {
-	test_start_
+	test_start_ "$@"
 	test "$#" = 3 && { test_prereq=$1; shift; } || test_prereq=
 	test "$#" = 2 ||
 	BUG "not 2 or 3 parameters to test-expect-failure"
@@ -582,6 +874,7 @@ test_expect_failure () {
 	export test_prereq
 	if ! test_skip "$@"
 	then
+		test -n "$test_skip_test_preamble" ||
 		say >&3 "checking known breakage of $TEST_NUMBER.$test_count '$1': $2"
 		if test_run_ "$2" expecting_failure
 		then
@@ -594,7 +887,7 @@ test_expect_failure () {
 }
 
 test_expect_success () {
-	test_start_
+	test_start_ "$@"
 	test "$#" = 3 && { test_prereq=$1; shift; } || test_prereq=
 	test "$#" = 2 ||
 	BUG "not 2 or 3 parameters to test-expect-success"
@@ -602,6 +895,7 @@ test_expect_success () {
 	export test_prereq
 	if ! test_skip "$@"
 	then
+		test -n "$test_skip_test_preamble" ||
 		say >&3 "expecting success of $TEST_NUMBER.$test_count '$1': $2"
 		if test_run_ "$2"
 		then
@@ -613,124 +907,78 @@ test_expect_success () {
 	test_finish_
 }
 
-# test_external runs external test scripts that provide continuous
-# test output about their progress, and succeeds/fails on
-# zero/non-zero exit code.  It outputs the test output on stdout even
-# in non-verbose mode, and announces the external script with "# run
-# <n>: ..." before running it.  When providing relative paths, keep in
-# mind that all scripts run in "trash directory".
-# Usage: test_external description command arguments...
-# Example: test_external 'Perl API' perl ../path/to/test.pl
-test_external () {
-	test "$#" = 4 && { test_prereq=$1; shift; } || test_prereq=
-	test "$#" = 3 ||
-	BUG "not 3 or 4 parameters to test_external"
-	descr="$1"
-	shift
-	test_verify_prereq
-	export test_prereq
-	if ! test_skip "$descr" "$@"
+# debugging-friendly alternatives to "test [-f|-d|-e]"
+# The commands test the existence or non-existence of $1
+test_path_is_file () {
+	test "$#" -ne 1 && BUG "1 param"
+	if ! test -f "$1"
 	then
-		# Announce the script to reduce confusion about the
-		# test output that follows.
-		say_color "" "# run $test_count: $descr ($*)"
-		# Export TEST_DIRECTORY, TRASH_DIRECTORY and GIT_TEST_LONG
-		# to be able to use them in script
-		export TEST_DIRECTORY TRASH_DIRECTORY GIT_TEST_LONG
-		# Run command; redirect its stderr to &4 as in
-		# test_run_, but keep its stdout on our stdout even in
-		# non-verbose mode.
-		"$@" 2>&4
-		if test "$?" = 0
-		then
-			if test $test_external_has_tap -eq 0; then
-				test_ok_ "$descr"
-			else
-				say_color "" "# test_external test $descr was ok"
-				test_success=$(($test_success + 1))
-			fi
-		else
-			if test $test_external_has_tap -eq 0; then
-				test_failure_ "$descr" "$@"
-			else
-				say_color error "# test_external test $descr failed: $@"
-				test_failure=$(($test_failure + 1))
-			fi
-		fi
+		echo "File $1 doesn't exist"
+		false
 	fi
 }
 
-# Like test_external, but in addition tests that the command generated
-# no output on stderr.
-test_external_without_stderr () {
-	# The temporary file has no (and must have no) security
-	# implications.
-	tmp=${TMPDIR:-/tmp}
-	stderr="$tmp/git-external-stderr.$$.tmp"
-	test_external "$@" 4> "$stderr"
-	test -f "$stderr" || error "Internal error: $stderr disappeared."
-	descr="no stderr: $1"
-	shift
-	say >&3 "# expecting no stderr from previous command"
-	if test ! -s "$stderr"
+test_path_is_file_not_symlink () {
+	test "$#" -ne 1 && BUG "1 param"
+	test_path_is_file "$1" &&
+	if test -h "$1"
 	then
-		rm "$stderr"
-
-		if test $test_external_has_tap -eq 0; then
-			test_ok_ "$descr"
-		else
-			say_color "" "# test_external_without_stderr test $descr was ok"
-			test_success=$(($test_success + 1))
-		fi
-	else
-		if test "$verbose" = t
-		then
-			output=$(echo; echo "# Stderr is:"; cat "$stderr")
-		else
-			output=
-		fi
-		# rm first in case test_failure exits.
-		rm "$stderr"
-		if test $test_external_has_tap -eq 0; then
-			test_failure_ "$descr" "$@" "$output"
-		else
-			say_color error "# test_external_without_stderr test $descr failed: $@: $output"
-			test_failure=$(($test_failure + 1))
-		fi
+		echo "$1 shouldn't be a symbolic link"
+		false
 	fi
 }
 
-# debugging-friendly alternatives to "test [-f|-d|-e]"
-# The commands test the existence or non-existence of $1. $2 can be
-# given to provide a more precise diagnosis.
-test_path_is_file () {
-	if ! test -f "$1"
+test_path_is_dir () {
+	test "$#" -ne 1 && BUG "1 param"
+	if ! test -d "$1"
 	then
-		echo "File $1 doesn't exist. $2"
+		echo "Directory $1 doesn't exist"
 		false
 	fi
 }
 
-test_path_is_dir () {
-	if ! test -d "$1"
+test_path_is_dir_not_symlink () {
+	test "$#" -ne 1 && BUG "1 param"
+	test_path_is_dir "$1" &&
+	if test -h "$1"
 	then
-		echo "Directory $1 doesn't exist. $2"
+		echo "$1 shouldn't be a symbolic link"
 		false
 	fi
 }
 
 test_path_exists () {
+	test "$#" -ne 1 && BUG "1 param"
 	if ! test -e "$1"
 	then
-		echo "Path $1 doesn't exist. $2"
+		echo "Path $1 doesn't exist"
+		false
+	fi
+}
+
+test_path_is_symlink () {
+	test "$#" -ne 1 && BUG "1 param"
+	if ! test -h "$1"
+	then
+		echo "Symbolic link $1 doesn't exist"
+		false
+	fi
+}
+
+test_path_is_executable () {
+	test "$#" -ne 1 && BUG "1 param"
+	if ! test -x "$1"
+	then
+		echo "$1 is not executable"
 		false
 	fi
 }
 
 # Check if the directory exists and is empty as expected, barf otherwise.
 test_dir_is_empty () {
+	test "$#" -ne 1 && BUG "1 param"
 	test_path_is_dir "$1" &&
-	if test -n "$(ls -a1 "$1" | egrep -v '^\.\.?$')"
+	if test -n "$(ls -a1 "$1" | grep -E -v '^\.\.?$')"
 	then
 		echo "Directory '$1' is not empty, it contains:"
 		ls -la "$1"
@@ -740,6 +988,7 @@ test_dir_is_empty () {
 
 # Check if the file exists and has a size greater than zero
 test_file_not_empty () {
+	test "$#" = 2 && BUG "2 param"
 	if ! test -s "$1"
 	then
 		echo "'$1' is not a non-empty file."
@@ -748,14 +997,11 @@ test_file_not_empty () {
 }
 
 test_path_is_missing () {
+	test "$#" -ne 1 && BUG "1 param"
 	if test -e "$1"
 	then
 		echo "Path exists:"
 		ls -ld "$1"
-		if test $# -ge 1
-		then
-			echo "$*"
-		fi
 		false
 	fi
 }
@@ -783,6 +1029,37 @@ test_line_count () {
 	fi
 }
 
+# SYNOPSIS:
+# 	test_stdout_line_count <bin-ops> <value> <cmd> [<args>...]
+#
+# test_stdout_line_count checks that the output of a command has the number
+# of lines it ought to. For example:
+#
+# test_stdout_line_count = 3 git ls-files -u
+# test_stdout_line_count -gt 10 ls
+test_stdout_line_count () {
+	local ops val trashdir &&
+	if test "$#" -le 3
+	then
+		BUG "expect 3 or more arguments"
+	fi &&
+	ops="$1" &&
+	val="$2" &&
+	shift 2 &&
+	if ! trashdir="$(git rev-parse --git-dir)/trash"; then
+		BUG "expect to be run inside a worktree"
+	fi &&
+	mkdir -p "$trashdir" &&
+	"$@" >"$trashdir/output" &&
+	test_line_count "$ops" "$val" "$trashdir/output"
+}
+
+
+test_file_size () {
+	test "$#" -ne 1 && BUG "1 param"
+	test-tool path-utils file-size "$1"
+}
+
 # Returns success if a comma separated string of keywords ($1) contains a
 # given keyword ($2).
 # Examples:
@@ -820,7 +1097,7 @@ test_must_fail_acceptable () {
 	fi
 
 	case "$1" in
-	git|__git*|test-tool|test-svn-fe|test_terminal)
+	git|__git*|scalar|test-tool|test_terminal)
 		return 0
 		;;
 	*)
@@ -951,7 +1228,8 @@ test_expect_code () {
 # - cmp's output is not nearly as easy to read as diff -u
 # - not all diff versions understand "-u"
 
-test_cmp() {
+test_cmp () {
+	test "$#" -ne 2 && BUG "2 param"
 	eval "$GIT_TEST_CMP" '"$@"'
 }
 
@@ -964,7 +1242,7 @@ test_cmp() {
 #
 #    test_cmp_config foo core.bar
 #
-test_cmp_config() {
+test_cmp_config () {
 	local GD &&
 	if test "$1" = "-C"
 	then
@@ -980,39 +1258,25 @@ test_cmp_config() {
 
 # test_cmp_bin - helper to compare binary files
 
-test_cmp_bin() {
+test_cmp_bin () {
+	test "$#" -ne 2 && BUG "2 param"
 	cmp "$@"
 }
 
-# Use this instead of test_cmp to compare files that contain expected and
-# actual output from git commands that can be translated.  When running
-# under GIT_TEST_GETTEXT_POISON this pretends that the command produced expected
-# results.
-test_i18ncmp () {
-	! test_have_prereq C_LOCALE_OUTPUT || test_cmp "$@"
+test_i18ngrep () {
+	BUG "do not use test_i18ngrep---use test_grep instead"
 }
 
-# Use this instead of "grep expected-string actual" to see if the
-# output from a git command that can be translated either contains an
-# expected string, or does not contain an unwanted one.  When running
-# under GIT_TEST_GETTEXT_POISON this pretends that the command produced expected
-# results.
-test_i18ngrep () {
+test_grep () {
 	eval "last_arg=\${$#}"
 
 	test -f "$last_arg" ||
-	BUG "test_i18ngrep requires a file to read as the last parameter"
+	BUG "test_grep requires a file to read as the last parameter"
 
 	if test $# -lt 2 ||
 	   { test "x!" = "x$1" && test $# -lt 3 ; }
 	then
-		BUG "too few parameters to test_i18ngrep"
-	fi
-
-	if test_have_prereq !C_LOCALE_OUTPUT
-	then
-		# pretend success
-		return 0
+		BUG "too few parameters to test_grep"
 	fi
 
 	if test "x!" = "x$1"
@@ -1037,19 +1301,11 @@ test_i18ngrep () {
 	return 1
 }
 
-# Call any command "$@" but be more verbose about its
-# failure. This is handy for commands like "test" which do
-# not output anything when they fail.
-verbose () {
-	"$@" && return 0
-	echo >&4 "command failed: $(git rev-parse --sq-quote "$@")"
-	return 1
-}
-
 # Check if the file expected to be empty is indeed empty, and barfs
 # otherwise.
 
 test_must_be_empty () {
+	test "$#" -ne 1 && BUG "1 param"
 	test_path_is_file "$1" &&
 	if test -s "$1"
 	then
@@ -1073,7 +1329,7 @@ test_cmp_rev () {
 	fi
 	if test $# != 2
 	then
-		error "bug in the test script: test_cmp_rev requires two revisions, but got $#"
+		BUG "test_cmp_rev requires two revisions, but got $#"
 	else
 		local r1 r2
 		r1=$(git rev-parse --verify "$1") &&
@@ -1091,6 +1347,39 @@ test_cmp_rev () {
 	fi
 }
 
+# Tests that a commit message matches the expected text
+#
+# Usage: test_commit_message <rev> [-m <msg> | <file>]
+#
+# When using "-m" <msg> will have a line feed appended. If the second
+# argument is omitted then the expected message is read from stdin.
+
+test_commit_message () {
+	local msg_file=expect.msg
+
+	case $# in
+	3)
+		if test "$2" = "-m"
+		then
+			printf "%s\n" "$3" >"$msg_file"
+		else
+			BUG "Usage: test_commit_message <rev> [-m <message> | <file>]"
+		fi
+		;;
+	2)
+		msg_file="$2"
+		;;
+	1)
+		cat >"$msg_file"
+		;;
+	*)
+		BUG "Usage: test_commit_message <rev> [-m <message> | <file>]"
+		;;
+	esac
+	git show --no-patch --pretty=format:%B "$1" -- >actual.msg &&
+	test_cmp "$msg_file" actual.msg
+}
+
 # Compare paths respecting core.ignoreCase
 test_cmp_fspath () {
 	if test "x$1" = "x$2"
@@ -1184,25 +1473,15 @@ test_atexit () {
 	# doing so on Bash is better than nothing (the test will
 	# silently pass on other shells).
 	test "${BASH_SUBSHELL-0}" = 0 ||
-	error "bug in test script: test_atexit does nothing in a subshell"
+	BUG "test_atexit does nothing in a subshell"
 	test_atexit_cleanup="{ $*
 		} && (exit \"\$eval_ret\"); eval_ret=\$?; $test_atexit_cleanup"
 }
 
-# Most tests can use the created repository, but some may need to create more.
+# Deprecated wrapper for "git init", use "git init" directly instead
 # Usage: test_create_repo <directory>
 test_create_repo () {
-	test "$#" = 1 ||
-	BUG "not 1 parameter to test-create-repo"
-	repo="$1"
-	mkdir -p "$repo"
-	(
-		cd "$repo" || error "Cannot setup test environment"
-		"${GIT_TEST_INSTALLED:-$GIT_EXEC_PATH}/git$X" init \
-			"--template=$GIT_BUILD_DIR/templates/blt/" >&3 2>&4 ||
-		error "cannot run git init -- have you built things yet?"
-		mv .git/hooks .git/hooks-disabled
-	) || exit
+	git init "$@"
 }
 
 # This function helps on symlink challenged file systems when it is not
@@ -1249,7 +1528,7 @@ test_bool_env () {
 		BUG "test_bool_env requires two parameters (variable name and default value)"
 	fi
 
-	git env--helper --type=bool --default="$2" --exit-code "$1"
+	test-tool env-helper --type=bool --default="$2" --exit-code "$1"
 	ret=$?
 	case $ret in
 	0|1)	# unset or valid bool value
@@ -1277,72 +1556,6 @@ test_skip_or_die () {
 	error "$2"
 }
 
-# The following mingw_* functions obey POSIX shell syntax, but are actually
-# bash scripts, and are meant to be used only with bash on Windows.
-
-# A test_cmp function that treats LF and CRLF equal and avoids to fork
-# diff when possible.
-mingw_test_cmp () {
-	# Read text into shell variables and compare them. If the results
-	# are different, use regular diff to report the difference.
-	local test_cmp_a= test_cmp_b=
-
-	# When text came from stdin (one argument is '-') we must feed it
-	# to diff.
-	local stdin_for_diff=
-
-	# Since it is difficult to detect the difference between an
-	# empty input file and a failure to read the files, we go straight
-	# to diff if one of the inputs is empty.
-	if test -s "$1" && test -s "$2"
-	then
-		# regular case: both files non-empty
-		mingw_read_file_strip_cr_ test_cmp_a <"$1"
-		mingw_read_file_strip_cr_ test_cmp_b <"$2"
-	elif test -s "$1" && test "$2" = -
-	then
-		# read 2nd file from stdin
-		mingw_read_file_strip_cr_ test_cmp_a <"$1"
-		mingw_read_file_strip_cr_ test_cmp_b
-		stdin_for_diff='<<<"$test_cmp_b"'
-	elif test "$1" = - && test -s "$2"
-	then
-		# read 1st file from stdin
-		mingw_read_file_strip_cr_ test_cmp_a
-		mingw_read_file_strip_cr_ test_cmp_b <"$2"
-		stdin_for_diff='<<<"$test_cmp_a"'
-	fi
-	test -n "$test_cmp_a" &&
-	test -n "$test_cmp_b" &&
-	test "$test_cmp_a" = "$test_cmp_b" ||
-	eval "diff -u \"\$@\" $stdin_for_diff"
-}
-
-# $1 is the name of the shell variable to fill in
-mingw_read_file_strip_cr_ () {
-	# Read line-wise using LF as the line separator
-	# and use IFS to strip CR.
-	local line
-	while :
-	do
-		if IFS=$'\r' read -r -d $'\n' line
-		then
-			# good
-			line=$line$'\n'
-		else
-			# we get here at EOF, but also if the last line
-			# was not terminated by LF; in the latter case,
-			# some text was read
-			if test -z "$line"
-			then
-				# EOF, really
-				break
-			fi
-		fi
-		eval "$1=\$$1\$line"
-	done
-}
-
 # Like "env FOO=BAR some-program", but run inside a subshell, which means
 # it also works for shell functions (though those functions cannot impact
 # the environment outside of the test_env invocation).
@@ -1409,46 +1622,24 @@ nongit () {
 	)
 } 7>&2 2>&4
 
-# convert function arguments or stdin (if not arguments given) to pktline
-# representation. If multiple arguments are given, they are separated by
-# whitespace and put in a single packet. Note that data containing NULs must be
-# given on stdin, and that empty input becomes an empty packet, not a flush
-# packet (for that you can just print 0000 yourself).
-packetize() {
+# These functions are historical wrappers around "test-tool pkt-line"
+# for older tests. Use "test-tool pkt-line" itself in new tests.
+packetize () {
 	if test $# -gt 0
 	then
 		packet="$*"
 		printf '%04x%s' "$((4 + ${#packet}))" "$packet"
 	else
-		perl -e '
-			my $packet = do { local $/; <STDIN> };
-			printf "%04x%s", 4 + length($packet), $packet;
-		'
+		test-tool pkt-line pack
 	fi
 }
 
-# Parse the input as a series of pktlines, writing the result to stdout.
-# Sideband markers are removed automatically, and the output is routed to
-# stderr if appropriate.
-#
-# NUL bytes are converted to "\\0" for ease of parsing with text tools.
+packetize_raw () {
+	test-tool pkt-line pack-raw-stdin
+}
+
 depacketize () {
-	perl -e '
-		while (read(STDIN, $len, 4) == 4) {
-			if ($len eq "0000") {
-				print "FLUSH\n";
-			} else {
-				read(STDIN, $buf, hex($len) - 4);
-				$buf =~ s/\0/\\0/g;
-				if ($buf =~ s/^[\x2\x3]//) {
-					print STDERR $buf;
-				} else {
-					$buf =~ s/^\x1//;
-					print $buf;
-				}
-			}
-		}
-	'
+	test-tool pkt-line unpack
 }
 
 # Converts base-16 data into base-8. The output is given as a sequence of
@@ -1464,7 +1655,21 @@ test_set_hash () {
 
 # Detect the hash algorithm in use.
 test_detect_hash () {
-	test_hash_algo="${GIT_TEST_DEFAULT_HASH:-sha1}"
+	case "$GIT_TEST_DEFAULT_HASH" in
+	"sha256")
+	    test_hash_algo=sha256
+	    test_compat_hash_algo=sha1
+	    ;;
+	*)
+	    test_hash_algo=sha1
+	    test_compat_hash_algo=sha256
+	    ;;
+	esac
+}
+
+# Detect the hash algorithm in use.
+test_detect_ref_format () {
+	echo "${GIT_TEST_DEFAULT_REF_FORMAT:-files}"
 }
 
 # Load common hash metadata and common placeholder object IDs for use with
@@ -1516,6 +1721,12 @@ test_oid () {
 	local algo="${test_hash_algo}" &&
 
 	case "$1" in
+	--hash=storage)
+		algo="$test_hash_algo" &&
+		shift;;
+	--hash=compat)
+		algo="$test_compat_hash_algo" &&
+		shift;;
 	--hash=*)
 		algo="${1#--hash=}" &&
 		shift;;
@@ -1531,20 +1742,30 @@ test_oid () {
 	then
 		BUG "undefined key '$1'"
 	fi &&
-	eval "printf '%s' \"\${$var}\""
+	eval "printf '%s\n' \"\${$var}\""
 }
 
 # Insert a slash into an object ID so it can be used to reference a location
 # under ".git/objects".  For example, "deadbeef..." becomes "de/adbeef..".
 test_oid_to_path () {
-	local basename=${1#??}
+	local basename="${1#??}"
 	echo "${1%$basename}/$basename"
 }
 
+# Parse oids from git ls-files --staged output
+test_parse_ls_files_stage_oids () {
+	awk '{print $2}' -
+}
+
+# Parse oids from git ls-tree output
+test_parse_ls_tree_oids () {
+	awk '{print $3}' -
+}
+
 # Choose a port number based on the test script's number and store it in
 # the given variable name, unless that variable already contains a number.
 test_set_port () {
-	local var=$1 port
+	local var="$1" port
 
 	if test $# -ne 1 || test -z "$var"
 	then
@@ -1580,39 +1801,174 @@ test_set_port () {
 	eval $var=$port
 }
 
-# Compare a file containing rev-list bitmap traversal output to its non-bitmap
-# counterpart. You can't just use test_cmp for this, because the two produce
-# subtly different output:
+# Tests for the hidden file attribute on Windows
+test_path_is_hidden () {
+	test_have_prereq MINGW ||
+	BUG "test_path_is_hidden can only be used on Windows"
+
+	# Use the output of `attrib`, ignore the absolute path
+	case "$("$SYSTEMROOT"/system32/attrib "$1")" in *H*?:*) return 0;; esac
+	return 1
+}
+
+# Poor man's URI escaping. Good enough for the test suite whose trash
+# directory has a space in it. See 93c3fcbe4d4 (git-svn: attempt to
+# mimic SVN 1.7 URL canonicalization, 2012-07-28) for prior art.
+test_uri_escape() {
+	sed 's/ /%20/g'
+}
+
+# Check that the given command was invoked as part of the
+# trace2-format trace on stdin.
+#
+#	test_subcommand [!] <command> <args>... < <trace>
+#
+# For example, to look for an invocation of "git upload-pack
+# /path/to/repo"
+#
+#	GIT_TRACE2_EVENT=event.log git fetch ... &&
+#	test_subcommand git upload-pack "$PATH" <event.log
+#
+# If the first parameter passed is !, this instead checks that
+# the given command was not called.
+#
+test_subcommand () {
+	local negate=
+	if test "$1" = "!"
+	then
+		negate=t
+		shift
+	fi
+
+	local expr="$(printf '"%s",' "$@")"
+	expr="${expr%,}"
+
+	if test -n "$negate"
+	then
+		! grep "\[$expr\]"
+	else
+		grep "\[$expr\]"
+	fi
+}
+
+# Check that the given command was invoked as part of the
+# trace2-format trace on stdin.
+#
+#	test_region [!] <category> <label> git <command> <args>...
 #
-#   - regular output is in traversal order, whereas bitmap is split by type,
-#     with non-packed objects at the end
+# For example, to look for trace2_region_enter("index", "do_read_index", repo)
+# in an invocation of "git checkout HEAD~1", run
 #
-#   - regular output has a space and the pathname appended to non-commit
-#     objects; bitmap output omits this
+#	GIT_TRACE2_EVENT="$(pwd)/trace.txt" GIT_TRACE2_EVENT_NESTING=10 \
+#		git checkout HEAD~1 &&
+#	test_region index do_read_index <trace.txt
 #
-# This function normalizes and compares the two. The second file should
-# always be the bitmap output.
-test_bitmap_traversal () {
-	if test "$1" = "--no-confirm-bitmaps"
+# If the first parameter passed is !, this instead checks that
+# the given region was not entered.
+#
+test_region () {
+	local expect_exit=0
+	if test "$1" = "!"
 	then
+		expect_exit=1
 		shift
-	elif cmp "$1" "$2"
+	fi
+
+	grep -e	'"region_enter".*"category":"'"$1"'","label":"'"$2"\" "$3"
+	exitcode=$?
+
+	if test $exitcode != $expect_exit
 	then
-		echo >&2 "identical raw outputs; are you sure bitmaps were used?"
 		return 1
-	fi &&
-	cut -d' ' -f1 "$1" | sort >"$1.normalized" &&
-	sort "$2" >"$2.normalized" &&
-	test_cmp "$1.normalized" "$2.normalized" &&
-	rm -f "$1.normalized" "$2.normalized"
+	fi
+
+	grep -e	'"region_leave".*"category":"'"$1"'","label":"'"$2"\" "$3"
+	exitcode=$?
+
+	if test $exitcode != $expect_exit
+	then
+		return 1
+	fi
+
+	return 0
 }
 
-# Tests for the hidden file attribute on Windows
-test_path_is_hidden () {
-	test_have_prereq MINGW ||
-	BUG "test_path_is_hidden can only be used on Windows"
+# Check that the given data fragment was included as part of the
+# trace2-format trace on stdin.
+#
+#	test_trace2_data <category> <key> <value>
+#
+# For example, to look for trace2_data_intmax("pack-objects", repo,
+# "reused", N) in an invocation of "git pack-objects", run:
+#
+#	GIT_TRACE2_EVENT="$(pwd)/trace.txt" git pack-objects ... &&
+#	test_trace2_data pack-objects reused N <trace2.txt
+test_trace2_data () {
+	grep -e '"category":"'"$1"'","key":"'"$2"'","value":"'"$3"'"'
+}
 
-	# Use the output of `attrib`, ignore the absolute path
-	case "$("$SYSTEMROOT"/system32/attrib "$1")" in *H*?:*) return 0;; esac
-	return 1
+# Given a GIT_TRACE2_EVENT log over stdin, writes to stdout a list of URLs
+# sent to git-remote-https child processes.
+test_remote_https_urls() {
+	grep -e '"event":"child_start".*"argv":\["git-remote-https",".*"\]' |
+		sed -e 's/{"event":"child_start".*"argv":\["git-remote-https","//g' \
+		    -e 's/"\]}//g'
+}
+
+# Print the destination of symlink(s) provided as arguments. Basically
+# the same as the readlink command, but it's not available everywhere.
+test_readlink () {
+	perl -le 'print readlink($_) for @ARGV' "$@"
+}
+
+# Set mtime to a fixed "magic" timestamp in mid February 2009, before we
+# run an operation that may or may not touch the file.  If the file was
+# touched, its timestamp will not accidentally have such an old timestamp,
+# as long as your filesystem clock is reasonably correct.  To verify the
+# timestamp, follow up with test_is_magic_mtime.
+#
+# An optional increment to the magic timestamp may be specified as second
+# argument.
+test_set_magic_mtime () {
+	local inc="${2:-0}" &&
+	local mtime=$((1234567890 + $inc)) &&
+	test-tool chmtime =$mtime "$1" &&
+	test_is_magic_mtime "$1" $inc
+}
+
+# Test whether the given file has the "magic" mtime set.  This is meant to
+# be used in combination with test_set_magic_mtime.
+#
+# An optional increment to the magic timestamp may be specified as second
+# argument.  Usually, this should be the same increment which was used for
+# the associated test_set_magic_mtime.
+test_is_magic_mtime () {
+	local inc="${2:-0}" &&
+	local mtime=$((1234567890 + $inc)) &&
+	echo $mtime >.git/test-mtime-expect &&
+	test-tool chmtime --get "$1" >.git/test-mtime-actual &&
+	test_cmp .git/test-mtime-expect .git/test-mtime-actual
+	local ret=$?
+	rm -f .git/test-mtime-expect
+	rm -f .git/test-mtime-actual
+	return $ret
+}
+
+# Given two filenames, parse both using 'git config --list --file'
+# and compare the sorted output of those commands. Useful when
+# wanting to ignore whitespace differences and sorting concerns.
+test_cmp_config_output () {
+	git config --list --file="$1" >config-expect &&
+	git config --list --file="$2" >config-actual &&
+	sort config-expect >sorted-expect &&
+	sort config-actual >sorted-actual &&
+	test_cmp sorted-expect sorted-actual
+}
+
+# Given a filename, extract its trailing hash as a hex string
+test_trailing_hash () {
+	local file="$1" &&
+	tail -c $(test_oid rawsz) "$file" |
+		test-tool hexdump |
+		sed "s/ //g"
 }
diff --git a/t/test-lib-github-workflow-markup.sh b/t/test-lib-github-workflow-markup.sh
new file mode 100644
index 0000000..33405c9
--- /dev/null
+++ b/t/test-lib-github-workflow-markup.sh
@@ -0,0 +1,56 @@
+# Library of functions to mark up test scripts' output suitable for
+# pretty-printing it in GitHub workflows.
+#
+# Copyright (c) 2022 Johannes Schindelin
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see https://www.gnu.org/licenses/ .
+#
+# The idea is for `test-lib.sh` to source this file when run in GitHub
+# workflows; these functions will then override (empty) functions
+# that are are called at the appropriate times during the test runs.
+
+test_skip_test_preamble=t
+
+start_test_output () {
+	test -n "$GIT_TEST_TEE_OUTPUT_FILE" ||
+	die "--github-workflow-markup requires --verbose-log"
+	github_markup_output="${GIT_TEST_TEE_OUTPUT_FILE%.out}.markup"
+	>$github_markup_output
+	GIT_TEST_TEE_OFFSET=0
+}
+
+# No need to override start_test_case_output
+
+finalize_test_case_output () {
+	test_case_result=$1
+	shift
+	case "$test_case_result" in
+	failure)
+		echo >>$github_markup_output "::error::failed: $this_test.$test_count $1"
+		;;
+	fixed)
+		echo >>$github_markup_output "::notice::fixed: $this_test.$test_count $1"
+		;;
+	ok|broken)
+		# Exit without printing the "ok" or ""broken" tests
+		return
+		;;
+	esac
+	echo >>$github_markup_output "::group::$test_case_result: $this_test.$test_count $*"
+	test-tool >>$github_markup_output path-utils skip-n-bytes \
+		"$GIT_TEST_TEE_OUTPUT_FILE" $GIT_TEST_TEE_OFFSET
+	echo >>$github_markup_output "::endgroup::"
+}
+
+# No need to override finalize_test_output
diff --git a/t/test-lib-junit.sh b/t/test-lib-junit.sh
new file mode 100644
index 0000000..76cbbd3
--- /dev/null
+++ b/t/test-lib-junit.sh
@@ -0,0 +1,132 @@
+# Library of functions to format test scripts' output in JUnit XML
+# format, to support Git's test suite result to be presented in an
+# easily digestible way on Azure Pipelines.
+#
+# Copyright (c) 2022 Johannes Schindelin
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see https://www.gnu.org/licenses/ .
+#
+# The idea is for `test-lib.sh` to source this file when the user asks
+# for JUnit XML; these functions will then override (empty) functions
+# that are are called at the appropriate times during the test runs.
+
+start_test_output () {
+	junit_xml_dir="$TEST_OUTPUT_DIRECTORY/out"
+	mkdir -p "$junit_xml_dir"
+	junit_xml_base=${1##*/}
+	junit_xml_path="$junit_xml_dir/TEST-${junit_xml_base%.sh}.xml"
+	junit_attrs="name=\"${junit_xml_base%.sh}\""
+	junit_attrs="$junit_attrs timestamp=\"$(TZ=UTC \
+		date +%Y-%m-%dT%H:%M:%S)\""
+	write_junit_xml --truncate "<testsuites>" "  <testsuite $junit_attrs>"
+	junit_suite_start=$(test-tool date getnanos)
+	if test -n "$GIT_TEST_TEE_OUTPUT_FILE"
+	then
+		GIT_TEST_TEE_OFFSET=0
+	fi
+}
+
+start_test_case_output () {
+	junit_start=$(test-tool date getnanos)
+}
+
+finalize_test_case_output () {
+	test_case_result=$1
+	shift
+	case "$test_case_result" in
+	ok)
+		set -- "$*"
+		;;
+	failure)
+		junit_insert="<failure message=\"not ok $test_count -"
+		junit_insert="$junit_insert $(xml_attr_encode --no-lf "$1")\">"
+		junit_insert="$junit_insert $(xml_attr_encode \
+			"$(if test -n "$GIT_TEST_TEE_OUTPUT_FILE"
+			   then
+				test-tool path-utils skip-n-bytes \
+					"$GIT_TEST_TEE_OUTPUT_FILE" $GIT_TEST_TEE_OFFSET
+			   else
+				printf '%s\n' "$@" | sed 1d
+			   fi)")"
+		junit_insert="$junit_insert</failure>"
+		if test -n "$GIT_TEST_TEE_OUTPUT_FILE"
+		then
+			junit_insert="$junit_insert<system-err>$(xml_attr_encode \
+				"$(cat "$GIT_TEST_TEE_OUTPUT_FILE")")</system-err>"
+		fi
+		set -- "$1" "      $junit_insert"
+		;;
+	fixed)
+		set -- "$* (breakage fixed)"
+		;;
+	broken)
+		set -- "$* (known breakage)"
+		;;
+	skip)
+		message="$(xml_attr_encode --no-lf "$skipped_reason")"
+		set -- "$1" "      <skipped message=\"$message\" />"
+		;;
+	esac
+
+	junit_attrs="name=\"$(xml_attr_encode --no-lf "$this_test.$test_count $1")\""
+	shift
+	junit_attrs="$junit_attrs classname=\"$this_test\""
+	junit_attrs="$junit_attrs time=\"$(test-tool \
+		date getnanos $junit_start)\""
+	write_junit_xml "$(printf '%s\n' \
+		"    <testcase $junit_attrs>" "$@" "    </testcase>")"
+	junit_have_testcase=t
+}
+
+finalize_test_output () {
+	if test -n "$junit_xml_path"
+	then
+		test -n "$junit_have_testcase" || {
+			junit_start=$(test-tool date getnanos)
+			write_junit_xml_testcase "all tests skipped"
+		}
+
+		# adjust the overall time
+		junit_time=$(test-tool date getnanos $junit_suite_start)
+		sed -e "s/\(<testsuite.*\) time=\"[^\"]*\"/\1/" \
+			-e "s/<testsuite [^>]*/& time=\"$junit_time\"/" \
+			-e '/^ *<\/testsuite/d' \
+			<"$junit_xml_path" >"$junit_xml_path.new"
+		mv "$junit_xml_path.new" "$junit_xml_path"
+
+		write_junit_xml "  </testsuite>" "</testsuites>"
+		write_junit_xml=
+	fi
+}
+
+write_junit_xml () {
+	case "$1" in
+	--truncate)
+		>"$junit_xml_path"
+		junit_have_testcase=
+		shift
+		;;
+	esac
+	printf '%s\n' "$@" >>"$junit_xml_path"
+}
+
+xml_attr_encode () {
+	if test "x$1" = "x--no-lf"
+	then
+		shift
+		printf '%s' "$*" | test-tool xml-encode
+	else
+		printf '%s\n' "$@" | test-tool xml-encode
+	fi
+}
diff --git a/t/test-lib.sh b/t/test-lib.sh
index ef31f40..79d3e0e 100644
--- a/t/test-lib.sh
+++ b/t/test-lib.sh
@@ -13,19 +13,26 @@
 # GNU General Public License for more details.
 #
 # You should have received a copy of the GNU General Public License
-# along with this program.  If not, see http://www.gnu.org/licenses/ .
+# along with this program.  If not, see https://www.gnu.org/licenses/ .
 
 # Test the binaries we have just built.  The tests are kept in
 # t/ subdirectory and are run in 'trash directory' subdirectory.
 if test -z "$TEST_DIRECTORY"
 then
-	# We allow tests to override this, in case they want to run tests
-	# outside of t/, e.g. for running tests on the test library
-	# itself.
-	TEST_DIRECTORY=$(pwd)
-else
 	# ensure that TEST_DIRECTORY is an absolute path so that it
 	# is valid even if the current working directory is changed
+	TEST_DIRECTORY=$(pwd)
+else
+	# The TEST_DIRECTORY will always be the path to the "t"
+	# directory in the git.git checkout. This is overridden by
+	# e.g. t/lib-subtest.sh, but only because its $(pwd) is
+	# different. Those tests still set "$TEST_DIRECTORY" to the
+	# same path.
+	#
+	# See use of "$GIT_BUILD_DIR" and "$TEST_DIRECTORY" below for
+	# hard assumptions about "$GIT_BUILD_DIR/t" existing and being
+	# the "$TEST_DIRECTORY", and e.g. "$TEST_DIRECTORY/helper"
+	# needing to exist.
 	TEST_DIRECTORY=$(cd "$TEST_DIRECTORY" && pwd) || exit 1
 fi
 if test -z "$TEST_OUTPUT_DIRECTORY"
@@ -34,21 +41,57 @@ then
 	# elsewhere
 	TEST_OUTPUT_DIRECTORY=$TEST_DIRECTORY
 fi
-GIT_BUILD_DIR="$TEST_DIRECTORY"/..
+GIT_BUILD_DIR="${TEST_DIRECTORY%/t}"
+if test "$TEST_DIRECTORY" = "$GIT_BUILD_DIR"
+then
+	echo "PANIC: Running in a $TEST_DIRECTORY that doesn't end in '/t'?" >&2
+	exit 1
+fi
+if test -f "$GIT_BUILD_DIR/GIT-BUILD-DIR"
+then
+	GIT_BUILD_DIR="$(cat "$GIT_BUILD_DIR/GIT-BUILD-DIR")" || exit 1
+	# On Windows, we must convert Windows paths lest they contain a colon
+	case "$(uname -s)" in
+	*MINGW*)
+		GIT_BUILD_DIR="$(cygpath -au "$GIT_BUILD_DIR")"
+		;;
+	esac
+fi
+
+# Prepend a string to a VAR using an arbitrary ":" delimiter, not
+# adding the delimiter if VAR or VALUE is empty. I.e. a generalized:
+#
+#	VAR=$1${VAR:+${1:+$2}$VAR}
+#
+# Usage (using ":" as the $2 delimiter):
+#
+#	prepend_var VAR : VALUE
+prepend_var () {
+	eval "$1=\"$3\${$1:+${3:+$2}\$$1}\""
+}
+
+# If [AL]SAN is in effect we want to abort so that we notice
+# problems. The GIT_SAN_OPTIONS variable can be used to set common
+# defaults shared between [AL]SAN_OPTIONS.
+prepend_var GIT_SAN_OPTIONS : abort_on_error=1
+prepend_var GIT_SAN_OPTIONS : strip_path_prefix="$GIT_BUILD_DIR/"
 
 # If we were built with ASAN, it may complain about leaks
 # of program-lifetime variables. Disable it by default to lower
 # the noise level. This needs to happen at the start of the script,
 # before we even do our "did we build git yet" check (since we don't
 # want that one to complain to stderr).
-: ${ASAN_OPTIONS=detect_leaks=0:abort_on_error=1}
+prepend_var ASAN_OPTIONS : $GIT_SAN_OPTIONS
+prepend_var ASAN_OPTIONS : detect_leaks=0
 export ASAN_OPTIONS
 
-# If LSAN is in effect we _do_ want leak checking, but we still
-# want to abort so that we notice the problems.
-: ${LSAN_OPTIONS=abort_on_error=1}
+prepend_var LSAN_OPTIONS : $GIT_SAN_OPTIONS
+prepend_var LSAN_OPTIONS : fast_unwind_on_malloc=0
 export LSAN_OPTIONS
 
+prepend_var UBSAN_OPTIONS : $GIT_SAN_OPTIONS
+export UBSAN_OPTIONS
+
 if test ! -f "$GIT_BUILD_DIR"/GIT-BUILD-OPTIONS
 then
 	echo >&2 'error: GIT-BUILD-OPTIONS missing (has Git been built?).'
@@ -57,6 +100,15 @@ fi
 . "$GIT_BUILD_DIR"/GIT-BUILD-OPTIONS
 export PERL_PATH SHELL_PATH
 
+# In t0000, we need to override test directories of nested testcases. In case
+# the developer has TEST_OUTPUT_DIRECTORY part of his build options, then we'd
+# reset this value to instead contain what the developer has specified. We thus
+# have this knob to allow overriding the directory.
+if test -n "${TEST_OUTPUT_DIRECTORY_OVERRIDE}"
+then
+	TEST_OUTPUT_DIRECTORY="${TEST_OUTPUT_DIRECTORY_OVERRIDE}"
+fi
+
 # Disallow the use of abbreviated options in the test suite by default
 if test -z "${GIT_TEST_DISALLOW_ABBREVIATED_OPTIONS}"
 then
@@ -64,6 +116,11 @@ then
 	export GIT_TEST_DISALLOW_ABBREVIATED_OPTIONS
 fi
 
+# Explicitly set the default branch name for testing, to avoid the
+# transitory "git init" warning under --verbose.
+: ${GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME:=master}
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 ################################################################
 # It appears that people try to run tests without building...
 "${GIT_TEST_INSTALLED:-$GIT_BUILD_DIR}/git$X" >/dev/null
@@ -93,6 +150,12 @@ mark_option_requires_arg () {
 	store_arg_to=$2
 }
 
+# These functions can be overridden e.g. to output JUnit XML
+start_test_output () { :; }
+start_test_case_output () { :; }
+finalize_test_case_output () { :; }
+finalize_test_output () { :; }
+
 parse_option () {
 	local opt="$1"
 
@@ -152,7 +215,10 @@ parse_option () {
 		tee=t
 		;;
 	--write-junit-xml)
-		write_junit_xml=t
+		. "$TEST_DIRECTORY/test-lib-junit.sh"
+		;;
+	--github-workflow-markup)
+		. "$TEST_DIRECTORY/test-lib-github-workflow-markup.sh"
 		;;
 	--stress)
 		stress=t ;;
@@ -163,8 +229,8 @@ parse_option () {
 		;;
 	--stress-jobs=*)
 		stress=t;
-		stress=${opt#--*=}
-		case "$stress" in
+		stress_jobs=${opt#--*=}
+		case "$stress_jobs" in
 		*[!0-9]*|0*|"")
 			echo "error: --stress-jobs=<N> requires the number of jobs to run" >&2
 			exit 1
@@ -185,6 +251,9 @@ parse_option () {
 			;;
 		esac
 		;;
+	--invert-exit-code)
+		invert_exit_code=t
+		;;
 	*)
 		echo "error: unknown test option '$opt'" >&2; exit 1 ;;
 	esac
@@ -249,6 +318,11 @@ TEST_NUMBER="${TEST_NAME%%-*}"
 TEST_NUMBER="${TEST_NUMBER#t}"
 TEST_RESULTS_DIR="$TEST_OUTPUT_DIRECTORY/test-results"
 TEST_RESULTS_BASE="$TEST_RESULTS_DIR/$TEST_NAME$TEST_STRESS_JOB_SFX"
+TEST_RESULTS_SAN_FILE_PFX=trace
+TEST_RESULTS_SAN_DIR_SFX=leak
+TEST_RESULTS_SAN_FILE=
+TEST_RESULTS_SAN_DIR="$TEST_RESULTS_DIR/$TEST_NAME.$TEST_RESULTS_SAN_DIR_SFX"
+TEST_RESULTS_SAN_DIR_NR_LEAKS_STARTUP=
 TRASH_DIRECTORY="trash directory.$TEST_NAME$TEST_STRESS_JOB_SFX"
 test -n "$root" && TRASH_DIRECTORY="$root/$TRASH_DIRECTORY"
 case "$TRASH_DIRECTORY" in
@@ -256,15 +330,26 @@ case "$TRASH_DIRECTORY" in
  *) TRASH_DIRECTORY="$TEST_OUTPUT_DIRECTORY/$TRASH_DIRECTORY" ;;
 esac
 
+# Utility functions using $TEST_RESULTS_* variables
+nr_san_dir_leaks_ () {
+	# stderr piped to /dev/null because the directory may have
+	# been "rmdir"'d already.
+	find "$TEST_RESULTS_SAN_DIR" \
+		-type f \
+		-name "$TEST_RESULTS_SAN_FILE_PFX.*" 2>/dev/null |
+	xargs grep -lv "Unable to get registers from thread" |
+	wc -l
+}
+
 # If --stress was passed, run this test repeatedly in several parallel loops.
 if test "$GIT_TEST_STRESS_STARTED" = "done"
 then
 	: # Don't stress test again.
 elif test -n "$stress"
 then
-	if test "$stress" != t
+	if test -n "$stress_jobs"
 	then
-		job_count=$stress
+		job_count=$stress_jobs
 	elif test -n "$GIT_TEST_STRESS_LOAD"
 	then
 		job_count="$GIT_TEST_STRESS_LOAD"
@@ -395,29 +480,27 @@ then
 	verbose=t
 fi
 
+# Since bash 5.0, checkwinsize is enabled by default which does
+# update the COLUMNS variable every time a non-builtin command
+# completes, even for non-interactive shells.
+# Disable that since we are aiming for repeatability.
+test -n "$BASH_VERSION" && shopt -u checkwinsize 2>/dev/null
+
 # For repeatability, reset the environment to known value.
 # TERM is sanitized below, after saving color control sequences.
 LANG=C
 LC_ALL=C
 PAGER=cat
 TZ=UTC
-export LANG LC_ALL PAGER TZ
+COLUMNS=80
+export LANG LC_ALL PAGER TZ COLUMNS
 EDITOR=:
 
-# GIT_TEST_GETTEXT_POISON should not influence git commands executed
-# during initialization of test-lib and the test repo. Back it up,
-# unset and then restore after initialization is finished.
-if test -n "$GIT_TEST_GETTEXT_POISON"
-then
-	GIT_TEST_GETTEXT_POISON_ORIG=$GIT_TEST_GETTEXT_POISON
-	unset GIT_TEST_GETTEXT_POISON
-fi
-
 # A call to "unset" with no arguments causes at least Solaris 10
 # /usr/xpg4/bin/sh and /bin/ksh to bail out.  So keep the unsets
 # deriving from the command substitution clustered with the other
 # ones.
-unset VISUAL EMAIL LANGUAGE COLUMNS $("$PERL_PATH" -e '
+unset VISUAL EMAIL LANGUAGE $("$PERL_PATH" -e '
 	my @env = keys %ENV;
 	my $ok = join("|", qw(
 		TRACE
@@ -437,6 +520,8 @@ unset VISUAL EMAIL LANGUAGE COLUMNS $("$PERL_PATH" -e '
 unset XDG_CACHE_HOME
 unset XDG_CONFIG_HOME
 unset GITPERLLIB
+unset GIT_TRACE2_PARENT_NAME
+unset GIT_TRACE2_PARENT_SID
 TEST_AUTHOR_LOCALNAME=author
 TEST_AUTHOR_DOMAIN=example.com
 GIT_AUTHOR_EMAIL=${TEST_AUTHOR_LOCALNAME}@${TEST_AUTHOR_DOMAIN}
@@ -457,40 +542,21 @@ export EDITOR
 
 GIT_DEFAULT_HASH="${GIT_TEST_DEFAULT_HASH:-sha1}"
 export GIT_DEFAULT_HASH
+GIT_DEFAULT_REF_FORMAT="${GIT_TEST_DEFAULT_REF_FORMAT:-files}"
+export GIT_DEFAULT_REF_FORMAT
+GIT_TEST_MERGE_ALGORITHM="${GIT_TEST_MERGE_ALGORITHM:-ort}"
+export GIT_TEST_MERGE_ALGORITHM
 
 # Tests using GIT_TRACE typically don't want <timestamp> <file>:<line> output
 GIT_TRACE_BARE=1
 export GIT_TRACE_BARE
 
-check_var_migration () {
-	# the warnings and hints given from this helper depends
-	# on end-user settings, which will disrupt the self-test
-	# done on the test framework itself.
-	case "$GIT_TEST_FRAMEWORK_SELFTEST" in
-	t)	return ;;
-	esac
-
-	old_name=$1 new_name=$2
-	eval "old_isset=\${${old_name}:+isset}"
-	eval "new_isset=\${${new_name}:+isset}"
-
-	case "$old_isset,$new_isset" in
-	isset,)
-		echo >&2 "warning: $old_name is now $new_name"
-		echo >&2 "hint: set $new_name too during the transition period"
-		eval "$new_name=\$$old_name"
-		;;
-	isset,isset)
-		# do this later
-		# echo >&2 "warning: $old_name is now $new_name"
-		# echo >&2 "hint: remove $old_name"
-		;;
-	esac
-}
-
-check_var_migration GIT_FSMONITOR_TEST GIT_TEST_FSMONITOR
-check_var_migration TEST_GIT_INDEX_VERSION GIT_TEST_INDEX_VERSION
-check_var_migration GIT_FORCE_PRELOAD_TEST GIT_TEST_PRELOAD_INDEX
+# Some tests scan the GIT_TRACE2_EVENT feed for events, but the
+# default depth is 2, which frequently causes issues when the
+# events are wrapped in new regions. Set it to a sufficiently
+# large depth to avoid custom changes in the test suite.
+GIT_TRACE2_EVENT_NESTING=100
+export GIT_TRACE2_EVENT_NESTING
 
 # Use specific version of the index file format
 if test -n "${GIT_TEST_INDEX_VERSION:+isset}"
@@ -499,9 +565,25 @@ then
 	export GIT_INDEX_VERSION
 fi
 
-# Add libc MALLOC and MALLOC_PERTURB test
-# only if we are not executing the test with valgrind
+if test -n "$GIT_TEST_PERL_FATAL_WARNINGS"
+then
+	GIT_PERL_FATAL_WARNINGS=1
+	export GIT_PERL_FATAL_WARNINGS
+fi
+
+case $GIT_TEST_FSYNC in
+'')
+	GIT_TEST_FSYNC=0
+	export GIT_TEST_FSYNC
+	;;
+esac
+
+# Add libc MALLOC and MALLOC_PERTURB test only if we are not executing
+# the test with valgrind and have not compiled with conflict SANITIZE
+# options.
 if test -n "$valgrind" ||
+   test -n "$SANITIZE_ADDRESS" ||
+   test -n "$SANITIZE_LEAK" ||
    test -n "$TEST_NO_MALLOC_CHECK"
 then
 	setup_malloc_check () {
@@ -511,12 +593,35 @@ then
 		: nothing
 	}
 else
+	_USE_GLIBC_TUNABLES=
+	if _GLIBC_VERSION=$(getconf GNU_LIBC_VERSION 2>/dev/null) &&
+	   _GLIBC_VERSION=${_GLIBC_VERSION#"glibc "} &&
+	   expr 2.34 \<= "$_GLIBC_VERSION" >/dev/null
+	then
+		_USE_GLIBC_TUNABLES=YesPlease
+	fi
 	setup_malloc_check () {
+		local g
+		local t
 		MALLOC_CHECK_=3	MALLOC_PERTURB_=165
 		export MALLOC_CHECK_ MALLOC_PERTURB_
+		if test -n "$_USE_GLIBC_TUNABLES"
+		then
+			g=
+			LD_PRELOAD="libc_malloc_debug.so.0"
+			for t in \
+				glibc.malloc.check=1 \
+				glibc.malloc.perturb=165
+			do
+				g="${g#:}:$t"
+			done
+			GLIBC_TUNABLES=$g
+			export LD_PRELOAD GLIBC_TUNABLES
+		fi
 	}
 	teardown_malloc_check () {
 		unset MALLOC_CHECK_ MALLOC_PERTURB_
+		unset LD_PRELOAD GLIBC_TUNABLES
 	}
 fi
 
@@ -544,14 +649,8 @@ SQ=\'
 # when case-folding filenames
 u200c=$(printf '\342\200\214')
 
-export _x05 _x35 _x40 _z40 LF u200c EMPTY_TREE EMPTY_BLOB ZERO_OID OID_REGEX
+export _x05 _x35 LF u200c EMPTY_TREE EMPTY_BLOB ZERO_OID OID_REGEX
 
-# Each test should start with something like this, after copyright notices:
-#
-# test_description='Description of this test...
-# This test checks if command xyzzy does the right thing...
-# '
-# . ./test-lib.sh
 test "x$TERM" != "xdumb" && (
 		test -t 1 &&
 		tput bold >/dev/null 2>&1 &&
@@ -595,20 +694,46 @@ else
 	}
 fi
 
+USER_TERM="$TERM"
 TERM=dumb
-export TERM
+export TERM USER_TERM
 
-error () {
-	say_color error "error: $*"
-	finalize_junit_xml
+# What is written by tests to stdout and stderr is sent to different places
+# depending on the test mode (e.g. /dev/null in non-verbose mode, piped to tee
+# with --tee option, etc.). We save the original stdin to FD #6 and stdout and
+# stderr to #5 and #7, so that the test framework can use them (e.g. for
+# printing errors within the test framework) independently of the test mode.
+exec 5>&1
+exec 6<&0
+exec 7>&2
+
+_error_exit () {
+	finalize_test_output
 	GIT_EXIT_OK=t
 	exit 1
 }
 
+error () {
+	say_color error "error: $*"
+	_error_exit
+}
+
 BUG () {
 	error >&7 "bug in the test script: $*"
 }
 
+BAIL_OUT () {
+	test $# -ne 1 && BUG "1 param"
+
+	# Do not change "Bail out! " string. It's part of TAP syntax:
+	# https://testanything.org/tap-specification.html
+	local bail_out="Bail out! "
+	local message="$1"
+
+	say_color >&5 error $bail_out "$message"
+	_error_exit
+}
+
 say () {
 	say_color info "$*"
 }
@@ -617,9 +742,7 @@ if test -n "$HARNESS_ACTIVE"
 then
 	if test "$verbose" = t || test -n "$verbose_only"
 	then
-		printf 'Bail out! %s\n' \
-		 'verbose mode forbidden under TAP harness; try --verbose-log'
-		exit 1
+		BAIL_OUT 'verbose mode forbidden under TAP harness; try --verbose-log'
 	fi
 fi
 
@@ -632,9 +755,6 @@ then
 	exit 0
 fi
 
-exec 5>&1
-exec 6<&0
-exec 7>&2
 if test "$verbose_log" = "t"
 then
 	exec 3>>"$GIT_TEST_TEE_OUTPUT_FILE" 4>&3
@@ -664,6 +784,8 @@ test_fixed=0
 test_broken=0
 test_success=0
 
+test_missing_prereq=
+
 test_external_has_tap=0
 
 die () {
@@ -696,58 +818,51 @@ trap '{ code=$?; set +x; } 2>/dev/null; exit $code' INT TERM HUP
 # the test_expect_* functions instead.
 
 test_ok_ () {
-	if test -n "$write_junit_xml"
-	then
-		write_junit_xml_testcase "$*"
-	fi
 	test_success=$(($test_success + 1))
 	say_color "" "ok $test_count - $@"
+	finalize_test_case_output ok "$@"
+}
+
+_invert_exit_code_failure_end_blurb () {
+	say_color warn "# faked up failures as TODO & now exiting with 0 due to --invert-exit-code"
 }
 
 test_failure_ () {
-	if test -n "$write_junit_xml"
+	failure_label=$1
+	test_failure=$(($test_failure + 1))
+	local pfx=""
+	if test -n "$invert_exit_code" # && test -n "$HARNESS_ACTIVE"
 	then
-		junit_insert="<failure message=\"not ok $test_count -"
-		junit_insert="$junit_insert $(xml_attr_encode "$1")\">"
-		junit_insert="$junit_insert $(xml_attr_encode \
-			"$(if test -n "$GIT_TEST_TEE_OUTPUT_FILE"
-			   then
-				test-tool path-utils skip-n-bytes \
-					"$GIT_TEST_TEE_OUTPUT_FILE" $GIT_TEST_TEE_OFFSET
-			   else
-				printf '%s\n' "$@" | sed 1d
-			   fi)")"
-		junit_insert="$junit_insert</failure>"
-		if test -n "$GIT_TEST_TEE_OUTPUT_FILE"
-		then
-			junit_insert="$junit_insert<system-err>$(xml_attr_encode \
-				"$(cat "$GIT_TEST_TEE_OUTPUT_FILE")")</system-err>"
-		fi
-		write_junit_xml_testcase "$1" "      $junit_insert"
+		pfx="# TODO induced breakage (--invert-exit-code):"
 	fi
-	test_failure=$(($test_failure + 1))
-	say_color error "not ok $test_count - $1"
+	say_color error "not ok $test_count - ${pfx:+$pfx }$1"
 	shift
 	printf '%s\n' "$*" | sed -e 's/^/#	/'
-	test "$immediate" = "" || { finalize_junit_xml; GIT_EXIT_OK=t; exit 1; }
+	if test -n "$immediate"
+	then
+		say_color error "1..$test_count"
+		if test -n "$invert_exit_code"
+		then
+			finalize_test_output
+			_invert_exit_code_failure_end_blurb
+			GIT_EXIT_OK=t
+			exit 0
+		fi
+		_error_exit
+	fi
+	finalize_test_case_output failure "$failure_label" "$@"
 }
 
 test_known_broken_ok_ () {
-	if test -n "$write_junit_xml"
-	then
-		write_junit_xml_testcase "$* (breakage fixed)"
-	fi
 	test_fixed=$(($test_fixed+1))
-	say_color error "ok $test_count - $@ # TODO known breakage vanished"
+	say_color error "ok $test_count - $1 # TODO known breakage vanished"
+	finalize_test_case_output fixed "$1"
 }
 
 test_known_broken_failure_ () {
-	if test -n "$write_junit_xml"
-	then
-		write_junit_xml_testcase "$* (known breakage)"
-	fi
 	test_broken=$(($test_broken+1))
-	say_color warn "not ok $test_count - $@ # TODO known breakage"
+	say_color warn "not ok $test_count - $1 # TODO known breakage"
+	finalize_test_case_output broken "$1"
 }
 
 test_debug () {
@@ -758,26 +873,38 @@ match_pattern_list () {
 	arg="$1"
 	shift
 	test -z "$*" && return 1
-	for pattern_
-	do
-		case "$arg" in
-		$pattern_)
-			return 0
-		esac
-	done
-	return 1
+	# We need to use "$*" to get field-splitting, but we want to
+	# disable globbing, since we are matching against an arbitrary
+	# $arg, not what's in the filesystem. Using "set -f" accomplishes
+	# that, but we must do it in a subshell to avoid impacting the
+	# rest of the script. The exit value of the subshell becomes
+	# the function's return value.
+	(
+		set -f
+		for pattern_ in $*
+		do
+			case "$arg" in
+			$pattern_)
+				exit 0
+				;;
+			esac
+		done
+		exit 1
+	)
 }
 
 match_test_selector_list () {
+	operation="$1"
+	shift
 	title="$1"
 	shift
 	arg="$1"
 	shift
 	test -z "$1" && return 0
 
-	# Both commas and whitespace are accepted as separators.
+	# Commas are accepted as separators.
 	OLDIFS=$IFS
-	IFS=' 	,'
+	IFS=','
 	set -- $1
 	IFS=$OLDIFS
 
@@ -805,13 +932,13 @@ match_test_selector_list () {
 			*-*)
 				if expr "z${selector%%-*}" : "z[0-9]*[^0-9]" >/dev/null
 				then
-					echo "error: $title: invalid non-numeric in range" \
+					echo "error: $operation: invalid non-numeric in range" \
 						"start: '$orig_selector'" >&2
 					exit 1
 				fi
 				if expr "z${selector#*-}" : "z[0-9]*[^0-9]" >/dev/null
 				then
-					echo "error: $title: invalid non-numeric in range" \
+					echo "error: $operation: invalid non-numeric in range" \
 						"end: '$orig_selector'" >&2
 					exit 1
 				fi
@@ -819,9 +946,11 @@ match_test_selector_list () {
 			*)
 				if expr "z$selector" : "z[0-9]*[^0-9]" >/dev/null
 				then
-					echo "error: $title: invalid non-numeric in test" \
-						"selector: '$orig_selector'" >&2
-					exit 1
+					case "$title" in *${selector}*)
+						include=$positive
+						;;
+					esac
+					continue
 				fi
 		esac
 
@@ -870,7 +999,7 @@ maybe_teardown_verbose () {
 last_verbose=t
 maybe_setup_verbose () {
 	test -z "$verbose_only" && return
-	if match_pattern_list $test_count $verbose_only
+	if match_pattern_list $test_count "$verbose_only"
 	then
 		exec 4>&2 3>&1
 		# Emit a delimiting blank line when going from
@@ -900,7 +1029,7 @@ maybe_setup_valgrind () {
 		return
 	fi
 	GIT_VALGRIND_ENABLED=
-	if match_pattern_list $test_count $valgrind_only
+	if match_pattern_list $test_count "$valgrind_only"
 	then
 		GIT_VALGRIND_ENABLED=t
 	fi
@@ -918,10 +1047,7 @@ want_trace () {
 # (and we want to make sure we run any cleanup like
 # "set +x").
 test_eval_inner_ () {
-	# Do not add anything extra (including LF) after '$*'
-	eval "
-		want_trace && trace_level_=$(($trace_level_+1)) && set -x
-		$*"
+	eval "$*"
 }
 
 test_eval_ () {
@@ -946,7 +1072,10 @@ test_eval_ () {
 	#     be _inside_ the block to avoid polluting the "set -x" output
 	#
 
-	test_eval_inner_ "$@" </dev/null >&3 2>&4
+	# Do not add anything extra (including LF) after '$*'
+	test_eval_inner_ </dev/null >&3 2>&4 "
+		want_trace && trace_level_=$(($trace_level_+1)) && set -x
+		$*"
 	{
 		test_eval_ret_=$?
 		if want_trace
@@ -963,23 +1092,22 @@ test_eval_ () {
 	return $test_eval_ret_
 }
 
+fail_117 () {
+	return 117
+}
+
 test_run_ () {
 	test_cleanup=:
 	expecting_failure=$2
 
 	if test "${GIT_TEST_CHAIN_LINT:-1}" != 0; then
-		# turn off tracing for this test-eval, as it simply creates
-		# confusing noise in the "-x" output
-		trace_tmp=$trace
-		trace=
 		# 117 is magic because it is unlikely to match the exit
 		# code of other programs
-		if $(printf '%s\n' "$1" | sed -f "$GIT_BUILD_DIR/t/chainlint.sed" | grep -q '?![A-Z][A-Z]*?!') ||
-			test "OK-117" != "$(test_eval_ "(exit 117) && $1${LF}${LF}echo OK-\$?" 3>&1)"
+		test_eval_inner_ "fail_117 && $1" </dev/null >&3 2>&4
+		if test $? != 117
 		then
-			BUG "broken &&-chain or run-away HERE-DOC: $1"
+			BUG "broken &&-chain: $1"
 		fi
-		trace=$trace_tmp
 	fi
 
 	setup_malloc_check
@@ -1005,10 +1133,7 @@ test_start_ () {
 	test_count=$(($test_count+1))
 	maybe_setup_verbose
 	maybe_setup_valgrind
-	if test -n "$write_junit_xml"
-	then
-		junit_start=$(test-tool date getnanos)
-	fi
+	start_test_case_output "$@"
 }
 
 test_finish_ () {
@@ -1025,13 +1150,13 @@ test_finish_ () {
 test_skip () {
 	to_skip=
 	skipped_reason=
-	if match_pattern_list $this_test.$test_count $GIT_SKIP_TESTS
+	if match_pattern_list $this_test.$test_count "$GIT_SKIP_TESTS"
 	then
 		to_skip=t
 		skipped_reason="GIT_SKIP_TESTS"
 	fi
 	if test -z "$to_skip" && test -n "$run_list" &&
-	   ! match_test_selector_list '--run' $test_count "$run_list"
+	   ! match_test_selector_list '--run' "$1" $test_count "$run_list"
 	then
 		to_skip=t
 		skipped_reason="--run"
@@ -1047,20 +1172,22 @@ test_skip () {
 			of_prereq=" of $test_prereq"
 		fi
 		skipped_reason="missing $missing_prereq${of_prereq}"
+
+		# Keep a list of all the missing prereq for result aggregation
+		if test -z "$missing_prereq"
+		then
+			test_missing_prereq=$missing_prereq
+		else
+			test_missing_prereq="$test_missing_prereq,$missing_prereq"
+		fi
 	fi
 
 	case "$to_skip" in
 	t)
-		if test -n "$write_junit_xml"
-		then
-			message="$(xml_attr_encode "$skipped_reason")"
-			write_junit_xml_testcase "$1" \
-				"      <skipped message=\"$message\" />"
-		fi
 
-		say_color skip >&3 "skipping test: $@"
 		say_color skip "ok $test_count # skip $1 ($skipped_reason)"
 		: true
+		finalize_test_case_output skip "$@"
 		;;
 	*)
 		false
@@ -1073,53 +1200,6 @@ test_at_end_hook_ () {
 	:
 }
 
-write_junit_xml () {
-	case "$1" in
-	--truncate)
-		>"$junit_xml_path"
-		junit_have_testcase=
-		shift
-		;;
-	esac
-	printf '%s\n' "$@" >>"$junit_xml_path"
-}
-
-xml_attr_encode () {
-	printf '%s\n' "$@" | test-tool xml-encode
-}
-
-write_junit_xml_testcase () {
-	junit_attrs="name=\"$(xml_attr_encode "$this_test.$test_count $1")\""
-	shift
-	junit_attrs="$junit_attrs classname=\"$this_test\""
-	junit_attrs="$junit_attrs time=\"$(test-tool \
-		date getnanos $junit_start)\""
-	write_junit_xml "$(printf '%s\n' \
-		"    <testcase $junit_attrs>" "$@" "    </testcase>")"
-	junit_have_testcase=t
-}
-
-finalize_junit_xml () {
-	if test -n "$write_junit_xml" && test -n "$junit_xml_path"
-	then
-		test -n "$junit_have_testcase" || {
-			junit_start=$(test-tool date getnanos)
-			write_junit_xml_testcase "all tests skipped"
-		}
-
-		# adjust the overall time
-		junit_time=$(test-tool date getnanos $junit_suite_start)
-		sed -e "s/\(<testsuite.*\) time=\"[^\"]*\"/\1/" \
-			-e "s/<testsuite [^>]*/& time=\"$junit_time\"/" \
-			-e '/^ *<\/testsuite/d' \
-			<"$junit_xml_path" >"$junit_xml_path.new"
-		mv "$junit_xml_path.new" "$junit_xml_path"
-
-		write_junit_xml "  </testsuite>" "</testsuites>"
-		write_junit_xml=
-	fi
-}
-
 test_atexit_cleanup=:
 test_atexit_handler () {
 	# In a succeeding test script 'test_atexit_handler' is invoked
@@ -1135,14 +1215,72 @@ test_atexit_handler () {
 	teardown_malloc_check
 }
 
-test_done () {
-	GIT_EXIT_OK=t
+sanitize_leak_log_message_ () {
+	local new="$1" &&
+	local old="$2" &&
+	local file="$3" &&
+
+	printf "With SANITIZE=leak at exit we have %d leak logs, but started with %d
+
+This means that we have a blindspot where git is leaking but we're
+losing the exit code somewhere, or not propagating it appropriately
+upwards!
+
+See the logs at \"%s.*\";
+those logs are reproduced below." \
+	       "$new" "$old" "$file"
+}
+
+check_test_results_san_file_ () {
+	if test -z "$TEST_RESULTS_SAN_FILE"
+	then
+		return
+	fi &&
+	local old="$TEST_RESULTS_SAN_DIR_NR_LEAKS_STARTUP" &&
+	local new="$(nr_san_dir_leaks_)" &&
+
+	if test $new -le $old
+	then
+		return
+	fi &&
+	local out="$(sanitize_leak_log_message_ "$new" "$old" "$TEST_RESULTS_SAN_FILE")" &&
+	say_color error "$out" &&
+	if test "$old" != 0
+	then
+		echo &&
+		say_color error "The logs include output from past runs to avoid" &&
+		say_color error "that remove 'test-results' between runs."
+	fi &&
+	say_color error "$(cat "$TEST_RESULTS_SAN_FILE".*)" &&
+
+	if test -n "$passes_sanitize_leak" && test "$test_failure" = 0
+	then
+		say "As TEST_PASSES_SANITIZE_LEAK=true and our logs show we're leaking, exit non-zero!" &&
+		invert_exit_code=t
+	elif test -n "$passes_sanitize_leak"
+	then
+		say "As TEST_PASSES_SANITIZE_LEAK=true and our logs show we're leaking, and we're failing for other reasons too..." &&
+		invert_exit_code=
+	elif test -n "$sanitize_leak_check" && test "$test_failure" = 0
+	then
+		say "As TEST_PASSES_SANITIZE_LEAK=true isn't set the above leak is 'ok' with GIT_TEST_PASSING_SANITIZE_LEAK=check" &&
+		invert_exit_code=
+	elif test -n "$sanitize_leak_check"
+	then
+		say "As TEST_PASSES_SANITIZE_LEAK=true isn't set the above leak is 'ok' with GIT_TEST_PASSING_SANITIZE_LEAK=check" &&
+		invert_exit_code=t
+	else
+		say "With GIT_TEST_SANITIZE_LEAK_LOG=true our logs revealed a memory leak, exit non-zero!" &&
+		invert_exit_code=t
+	fi
+}
 
+test_done () {
 	# Run the atexit commands _before_ the trash directory is
 	# removed, so the commands can access pidfiles and socket files.
 	test_atexit_handler
 
-	finalize_junit_xml
+	finalize_test_output
 
 	if test -z "$HARNESS_ACTIVE"
 	then
@@ -1154,10 +1292,16 @@ test_done () {
 		fixed $test_fixed
 		broken $test_broken
 		failed $test_failure
+		missing_prereq $test_missing_prereq
 
 		EOF
 	fi
 
+	if test -z "$passes_sanitize_leak" && test_bool_env TEST_PASSES_SANITIZE_LEAK false
+	then
+		BAIL_OUT "Please, set TEST_PASSES_SANITIZE_LEAK before sourcing test-lib.sh"
+	fi
+
 	if test "$test_fixed" != 0
 	then
 		say_color error "# $test_fixed known breakage(s) vanished; please update test(s)"
@@ -1176,28 +1320,32 @@ test_done () {
 	fi
 	case "$test_failure" in
 	0)
-		if test $test_external_has_tap -eq 0
+		if test $test_remaining -gt 0
 		then
-			if test $test_remaining -gt 0
-			then
-				say_color pass "# passed all $msg"
-			fi
-
-			# Maybe print SKIP message
-			test -z "$skip_all" || skip_all="# SKIP $skip_all"
-			case "$test_count" in
-			0)
-				say "1..$test_count${skip_all:+ $skip_all}"
-				;;
-			*)
-				test -z "$skip_all" ||
-				say_color warn "$skip_all"
-				say "1..$test_count"
-				;;
-			esac
+			say_color pass "# passed all $msg"
 		fi
 
-		if test -z "$debug"
+		# Maybe print SKIP message
+		test -z "$skip_all" || skip_all="# SKIP $skip_all"
+		case "$test_count" in
+		0)
+			say "1..$test_count${skip_all:+ $skip_all}"
+			;;
+		*)
+			test -z "$skip_all" ||
+			say_color warn "$skip_all"
+			say "1..$test_count"
+			;;
+		esac
+
+		if test -n "$stress" && test -n "$invert_exit_code"
+		then
+			# We're about to move our "$TRASH_DIRECTORY"
+			# to "$TRASH_DIRECTORY.stress-failed" if
+			# --stress is combined with
+			# --invert-exit-code.
+			say "with --stress and --invert-exit-code we're not removing '$TRASH_DIRECTORY'"
+		elif test -z "$debug" && test -n "$remove_trash"
 		then
 			test -d "$TRASH_DIRECTORY" ||
 			error "Tests passed but trash directory already removed before test cleanup; aborting"
@@ -1210,17 +1358,35 @@ test_done () {
 			} ||
 			error "Tests passed but test cleanup failed; aborting"
 		fi
+
+		check_test_results_san_file_ "$test_failure"
+
+		if test -z "$skip_all" && test -n "$invert_exit_code"
+		then
+			say_color warn "# faking up non-zero exit with --invert-exit-code"
+			GIT_EXIT_OK=t
+			exit 1
+		fi
+
 		test_at_end_hook_
 
+		GIT_EXIT_OK=t
 		exit 0 ;;
 
 	*)
-		if test $test_external_has_tap -eq 0
+		say_color error "# failed $test_failure among $msg"
+		say "1..$test_count"
+
+		check_test_results_san_file_ "$test_failure"
+
+		if test -n "$invert_exit_code"
 		then
-			say_color error "# failed $test_failure among $msg"
-			say "1..$test_count"
+			_invert_exit_code_failure_end_blurb
+			GIT_EXIT_OK=t
+			exit 0
 		fi
 
+		GIT_EXIT_OK=t
 		exit 1 ;;
 
 	esac
@@ -1337,7 +1503,8 @@ fi
 GIT_TEMPLATE_DIR="$GIT_BUILD_DIR"/templates/blt
 GIT_CONFIG_NOSYSTEM=1
 GIT_ATTR_NOSYSTEM=1
-export PATH GIT_EXEC_PATH GIT_TEMPLATE_DIR GIT_CONFIG_NOSYSTEM GIT_ATTR_NOSYSTEM
+GIT_CEILING_DIRECTORIES="$TRASH_DIRECTORY/.."
+export PATH GIT_EXEC_PATH GIT_TEMPLATE_DIR GIT_CONFIG_NOSYSTEM GIT_ATTR_NOSYSTEM GIT_CEILING_DIRECTORIES
 
 if test -z "$GIT_TEST_CMP"
 then
@@ -1352,69 +1519,142 @@ fi
 GITPERLLIB="$GIT_BUILD_DIR"/perl/build/lib
 export GITPERLLIB
 test -d "$GIT_BUILD_DIR"/templates/blt || {
-	error "You haven't built things yet, have you?"
+	BAIL_OUT "You haven't built things yet, have you?"
 }
 
 if ! test -x "$GIT_BUILD_DIR"/t/helper/test-tool$X
 then
-	echo >&2 'You need to build test-tool:'
-	echo >&2 'Run "make t/helper/test-tool" in the source (toplevel) directory'
-	exit 1
+	BAIL_OUT 'You need to build test-tool; Run "make t/helper/test-tool" in the source (toplevel) directory'
 fi
 
-# Test repository
-rm -fr "$TRASH_DIRECTORY" || {
-	GIT_EXIT_OK=t
-	echo >&5 "FATAL: Cannot prepare test area"
-	exit 1
+# Are we running this test at all?
+remove_trash=
+this_test=${0##*/}
+this_test=${this_test%%-*}
+if match_pattern_list "$this_test" "$GIT_SKIP_TESTS"
+then
+	say_color info >&3 "skipping test $this_test altogether"
+	skip_all="skip all tests in $this_test"
+	test_done
+fi
+
+BAIL_OUT_ENV_NEEDS_SANITIZE_LEAK () {
+	BAIL_OUT "$1 has no effect except when compiled with SANITIZE=leak"
 }
 
+if test -n "$SANITIZE_LEAK"
+then
+	# Normalize with test_bool_env
+	passes_sanitize_leak=
+
+	# We need to see TEST_PASSES_SANITIZE_LEAK in "test-tool
+	# env-helper" (via test_bool_env)
+	export TEST_PASSES_SANITIZE_LEAK
+	if test_bool_env TEST_PASSES_SANITIZE_LEAK false
+	then
+		passes_sanitize_leak=t
+	fi
+
+	if test "$GIT_TEST_PASSING_SANITIZE_LEAK" = "check"
+	then
+		sanitize_leak_check=t
+		if test -n "$invert_exit_code"
+		then
+			BAIL_OUT "cannot use --invert-exit-code under GIT_TEST_PASSING_SANITIZE_LEAK=check"
+		fi
+
+		if test -z "$passes_sanitize_leak"
+		then
+			say "in GIT_TEST_PASSING_SANITIZE_LEAK=check mode, setting --invert-exit-code for TEST_PASSES_SANITIZE_LEAK != true"
+			invert_exit_code=t
+		fi
+	elif test -z "$passes_sanitize_leak" &&
+	     test_bool_env GIT_TEST_PASSING_SANITIZE_LEAK false
+	then
+		skip_all="skipping $this_test under GIT_TEST_PASSING_SANITIZE_LEAK=true"
+		test_done
+	fi
+
+	if test_bool_env GIT_TEST_SANITIZE_LEAK_LOG false
+	then
+		if ! mkdir -p "$TEST_RESULTS_SAN_DIR"
+		then
+			BAIL_OUT "cannot create $TEST_RESULTS_SAN_DIR"
+		fi &&
+		TEST_RESULTS_SAN_FILE="$TEST_RESULTS_SAN_DIR/$TEST_RESULTS_SAN_FILE_PFX"
+
+		# In case "test-results" is left over from a previous
+		# run: Only report if new leaks show up.
+		TEST_RESULTS_SAN_DIR_NR_LEAKS_STARTUP=$(nr_san_dir_leaks_)
+
+		# Don't litter *.leak dirs if there was nothing to report
+		test_atexit "rmdir \"$TEST_RESULTS_SAN_DIR\" 2>/dev/null || :"
+
+		prepend_var LSAN_OPTIONS : dedup_token_length=9999
+		prepend_var LSAN_OPTIONS : log_exe_name=1
+		prepend_var LSAN_OPTIONS : log_path=\"$TEST_RESULTS_SAN_FILE\"
+		export LSAN_OPTIONS
+	fi
+elif test "$GIT_TEST_PASSING_SANITIZE_LEAK" = "check" ||
+     test_bool_env GIT_TEST_PASSING_SANITIZE_LEAK false
+then
+	BAIL_OUT_ENV_NEEDS_SANITIZE_LEAK "GIT_TEST_PASSING_SANITIZE_LEAK=true"
+elif test_bool_env GIT_TEST_SANITIZE_LEAK_LOG false
+then
+	BAIL_OUT_ENV_NEEDS_SANITIZE_LEAK "GIT_TEST_SANITIZE_LEAK_LOG=true"
+fi
+
+if test "${GIT_TEST_CHAIN_LINT:-1}" != 0 &&
+   test "${GIT_TEST_EXT_CHAIN_LINT:-1}" != 0
+then
+	"$PERL_PATH" "$TEST_DIRECTORY/chainlint.pl" "$0" ||
+		BUG "lint error (see '?!...!? annotations above)"
+fi
+
+# Last-minute variable setup
+USER_HOME="$HOME"
 HOME="$TRASH_DIRECTORY"
 GNUPGHOME="$HOME/gnupg-home-not-used"
-export HOME GNUPGHOME
+export HOME GNUPGHOME USER_HOME
+
+# "rm -rf" existing trash directory, even if a previous run left it
+# with bad permissions.
+remove_trash_directory () {
+	dir="$1"
+	if ! rm -rf "$dir" 2>/dev/null
+	then
+		chmod -R u+rwx "$dir"
+		rm -rf "$dir"
+	fi
+	! test -d "$dir"
+}
+
+# Test repository
+remove_trash_directory "$TRASH_DIRECTORY" || {
+	BAIL_OUT 'cannot prepare test area'
+}
 
+remove_trash=t
 if test -z "$TEST_NO_CREATE_REPO"
 then
-	test_create_repo "$TRASH_DIRECTORY"
+	git init \
+	    ${TEST_CREATE_REPO_NO_TEMPLATE:+--template=} \
+	    "$TRASH_DIRECTORY" >&3 2>&4 ||
+	error "cannot run git init"
 else
 	mkdir -p "$TRASH_DIRECTORY"
 fi
 
 # Use -P to resolve symlinks in our working directory so that the cwd
 # in subprocesses like git equals our $PWD (for pathname comparisons).
-cd -P "$TRASH_DIRECTORY" || exit 1
-
-this_test=${0##*/}
-this_test=${this_test%%-*}
-if match_pattern_list "$this_test" $GIT_SKIP_TESTS
-then
-	say_color info >&3 "skipping test $this_test altogether"
-	skip_all="skip all tests in $this_test"
-	test_done
-fi
+cd -P "$TRASH_DIRECTORY" || BAIL_OUT "cannot cd -P to \"$TRASH_DIRECTORY\""
 
-if test -n "$write_junit_xml"
-then
-	junit_xml_dir="$TEST_OUTPUT_DIRECTORY/out"
-	mkdir -p "$junit_xml_dir"
-	junit_xml_base=${0##*/}
-	junit_xml_path="$junit_xml_dir/TEST-${junit_xml_base%.sh}.xml"
-	junit_attrs="name=\"${junit_xml_base%.sh}\""
-	junit_attrs="$junit_attrs timestamp=\"$(TZ=UTC \
-		date +%Y-%m-%dT%H:%M:%S)\""
-	write_junit_xml --truncate "<testsuites>" "  <testsuite $junit_attrs>"
-	junit_suite_start=$(test-tool date getnanos)
-	if test -n "$GIT_TEST_TEE_OUTPUT_FILE"
-	then
-		GIT_TEST_TEE_OFFSET=0
-	fi
-fi
+start_test_output "$0"
 
 # Convenience
-# A regexp to match 5, 35 and 40 hexdigits
+# A regexp to match 5 and 35 hexdigits
 _x05='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
 _x35="$_x05$_x05$_x05$_x05$_x05$_x05$_x05"
-_x40="$_x35$_x05"
 
 test_oid_init
 
@@ -1423,7 +1663,6 @@ OID_REGEX=$(echo $ZERO_OID | sed -e 's/0/[0-9a-f]/g')
 OIDPATH_REGEX=$(test_oid_to_path $ZERO_OID | sed -e 's/0/[0-9a-f]/g')
 EMPTY_TREE=$(test_oid empty_tree)
 EMPTY_BLOB=$(test_oid empty_blob)
-_z40=$ZERO_OID
 
 # Provide an implementation of the 'yes' utility; the upper bound
 # limit is there to help Windows that cannot stop this loop from
@@ -1449,7 +1688,7 @@ yes () {
 # The GIT_TEST_FAIL_PREREQS code hooks into test_set_prereq(), and
 # thus needs to be set up really early, and set an internal variable
 # for convenience so the hot test_set_prereq() codepath doesn't need
-# to call "git env--helper" (via test_bool_env). Only do that work
+# to call "test-tool env-helper" (via test_bool_env). Only do that work
 # if needed by seeing if GIT_TEST_FAIL_PREREQS is set at all.
 GIT_TEST_FAIL_PREREQS_INTERNAL=
 if test -n "$GIT_TEST_FAIL_PREREQS"
@@ -1487,7 +1726,8 @@ case $uname_s in
 	test_set_prereq NATIVE_CRLF
 	test_set_prereq SED_STRIPS_CR
 	test_set_prereq GREP_STRIPS_CR
-	GIT_TEST_CMP=mingw_test_cmp
+	test_set_prereq WINDOWS
+	GIT_TEST_CMP="GIT_DIR=/dev/null git diff --no-index --ignore-cr-at-eol --"
 	;;
 *CYGWIN*)
 	test_set_prereq POSIXPERM
@@ -1495,6 +1735,7 @@ case $uname_s in
 	test_set_prereq CYGWIN
 	test_set_prereq SED_STRIPS_CR
 	test_set_prereq GREP_STRIPS_CR
+	test_set_prereq WINDOWS
 	;;
 *)
 	test_set_prereq POSIXPERM
@@ -1511,25 +1752,27 @@ parisc* | hppa*)
 	;;
 esac
 
+case "$GIT_DEFAULT_REF_FORMAT" in
+files)
+	test_set_prereq REFFILES;;
+reftable)
+	test_set_prereq REFTABLE;;
+*)
+	echo 2>&1 "error: unknown ref format $GIT_DEFAULT_REF_FORMAT"
+	exit 1
+	;;
+esac
+
 ( COLUMNS=1 && test $COLUMNS = 1 ) && test_set_prereq COLUMNS_CAN_BE_1
+test -z "$NO_CURL" && test_set_prereq LIBCURL
 test -z "$NO_PERL" && test_set_prereq PERL
 test -z "$NO_PTHREADS" && test_set_prereq PTHREADS
 test -z "$NO_PYTHON" && test_set_prereq PYTHON
-test -n "$USE_LIBPCRE1$USE_LIBPCRE2" && test_set_prereq PCRE
-test -n "$USE_LIBPCRE1" && test_set_prereq LIBPCRE1
+test -n "$USE_LIBPCRE2" && test_set_prereq PCRE
 test -n "$USE_LIBPCRE2" && test_set_prereq LIBPCRE2
 test -z "$NO_GETTEXT" && test_set_prereq GETTEXT
-
-if test -n "$GIT_TEST_GETTEXT_POISON_ORIG"
-then
-	GIT_TEST_GETTEXT_POISON=$GIT_TEST_GETTEXT_POISON_ORIG
-	export GIT_TEST_GETTEXT_POISON
-	unset GIT_TEST_GETTEXT_POISON_ORIG
-fi
-
-test_lazy_prereq C_LOCALE_OUTPUT '
-	! test_bool_env GIT_TEST_GETTEXT_POISON false
-'
+test -n "$SANITIZE_LEAK" && test_set_prereq SANITIZE_LEAK
+test -n "$GIT_VALGRIND_ENABLED" && test_set_prereq VALGRIND
 
 if test -z "$GIT_TEST_CHECK_CACHE_TREE"
 then
@@ -1548,6 +1791,12 @@ test_lazy_prereq SYMLINKS '
 	ln -s x y && test -h y
 '
 
+test_lazy_prereq SYMLINKS_WINDOWS '
+	# test whether symbolic links are enabled on Windows
+	test_have_prereq MINGW &&
+	cmd //c "mklink y x" &> /dev/null && test -h y
+'
+
 test_lazy_prereq FILEMODE '
 	test "$(git config --bool core.filemode)" = true
 '
@@ -1677,6 +1926,10 @@ build_option () {
 	sed -ne "s/^$1: //p"
 }
 
+test_lazy_prereq SIZE_T_IS_64BIT '
+	test 8 -eq "$(build_option sizeof-size_t)"
+'
+
 test_lazy_prereq LONG_IS_64BIT '
 	test 8 -le "$(build_option sizeof-long)"
 '
@@ -1699,6 +1952,21 @@ test_lazy_prereq SHA1 '
 	esac
 '
 
-test_lazy_prereq REBASE_P '
-	test -z "$GIT_TEST_SKIP_REBASE_P"
+test_lazy_prereq DEFAULT_REPO_FORMAT '
+	test_have_prereq SHA1,REFFILES
+'
+
+# Ensure that no test accidentally triggers a Git command
+# that runs the actual maintenance scheduler, affecting a user's
+# system permanently.
+# Tests that verify the scheduler integration must set this locally
+# to avoid errors.
+GIT_TEST_MAINT_SCHEDULER="none:exit 1"
+export GIT_TEST_MAINT_SCHEDULER
+
+# Does this platform support `git fsmonitor--daemon`
+#
+test_lazy_prereq FSMONITOR_DAEMON '
+	git version --build-options >output &&
+	grep "feature: fsmonitor--daemon" output
 '
diff --git a/t/test-terminal.perl b/t/test-terminal.perl
index 46bf618..3810e9b 100755
--- a/t/test-terminal.perl
+++ b/t/test-terminal.perl
@@ -1,5 +1,5 @@
 #!/usr/bin/perl
-use 5.008;
+use 5.008001;
 use strict;
 use warnings;
 use IO::Pty;
@@ -81,24 +81,24 @@ if ($#ARGV < 1) {
 	die "usage: test-terminal program args";
 }
 $ENV{TERM} = 'vt100';
-my $master_in = new IO::Pty;
-my $master_out = new IO::Pty;
-my $master_err = new IO::Pty;
-$master_in->set_raw();
-$master_out->set_raw();
-$master_err->set_raw();
-$master_in->slave->set_raw();
-$master_out->slave->set_raw();
-$master_err->slave->set_raw();
-my $pid = start_child(\@ARGV, $master_in->slave, $master_out->slave, $master_err->slave);
-close $master_in->slave;
-close $master_out->slave;
-close $master_err->slave;
-my $in_pid = copy_stdin($master_in);
-copy_stdio($master_out, $master_err);
+my $parent_in = new IO::Pty;
+my $parent_out = new IO::Pty;
+my $parent_err = new IO::Pty;
+$parent_in->set_raw();
+$parent_out->set_raw();
+$parent_err->set_raw();
+$parent_in->slave->set_raw();
+$parent_out->slave->set_raw();
+$parent_err->slave->set_raw();
+my $pid = start_child(\@ARGV, $parent_in->slave, $parent_out->slave, $parent_err->slave);
+close $parent_in->slave;
+close $parent_out->slave;
+close $parent_err->slave;
+my $in_pid = copy_stdin($parent_in);
+copy_stdio($parent_out, $parent_err);
 my $ret = finish_child($pid);
 # If the child process terminates before our copy_stdin() process is able to
-# write all of its data to $master_in, the copy_stdin() process could stall.
+# write all of its data to $parent_in, the copy_stdin() process could stall.
 # Send SIGTERM to it to ensure it terminates.
 kill 'TERM', $in_pid;
 finish_child($in_pid);
diff --git a/t/unit-tests/.gitignore b/t/unit-tests/.gitignore
new file mode 100644
index 0000000..5e56e04
--- /dev/null
+++ b/t/unit-tests/.gitignore
@@ -0,0 +1 @@
+/bin
diff --git a/t/unit-tests/t-basic.c b/t/unit-tests/t-basic.c
new file mode 100644
index 0000000..fda1ae5
--- /dev/null
+++ b/t/unit-tests/t-basic.c
@@ -0,0 +1,95 @@
+#include "test-lib.h"
+
+/*
+ * The purpose of this "unit test" is to verify a few invariants of the unit
+ * test framework itself, as well as to provide examples of output from actually
+ * failing tests. As such, it is intended that this test fails, and thus it
+ * should not be run as part of `make unit-tests`. Instead, we verify it behaves
+ * as expected in the integration test t0080-unit-test-output.sh
+ */
+
+/* Used to store the return value of check_int(). */
+static int check_res;
+
+/* Used to store the return value of TEST(). */
+static int test_res;
+
+static void t_res(int expect)
+{
+	check_int(check_res, ==, expect);
+	check_int(test_res, ==, expect);
+}
+
+static void t_todo(int x)
+{
+	check_res = TEST_TODO(check(x));
+}
+
+static void t_skip(void)
+{
+	check(0);
+	test_skip("missing prerequisite");
+	check(1);
+}
+
+static int do_skip(void)
+{
+	test_skip("missing prerequisite");
+	return 1;
+}
+
+static void t_skip_todo(void)
+{
+	check_res = TEST_TODO(do_skip());
+}
+
+static void t_todo_after_fail(void)
+{
+	check(0);
+	TEST_TODO(check(0));
+}
+
+static void t_fail_after_todo(void)
+{
+	check(1);
+	TEST_TODO(check(0));
+	check(0);
+}
+
+static void t_messages(void)
+{
+	check_str("\thello\\", "there\"\n");
+	check_str("NULL", NULL);
+	check_char('a', ==, '\n');
+	check_char('\\', ==, '\'');
+}
+
+static void t_empty(void)
+{
+	; /* empty */
+}
+
+int cmd_main(int argc, const char **argv)
+{
+	test_res = TEST(check_res = check_int(1, ==, 1), "passing test");
+	TEST(t_res(1), "passing test and assertion return 1");
+	test_res = TEST(check_res = check_int(1, ==, 2), "failing test");
+	TEST(t_res(0), "failing test and assertion return 0");
+	test_res = TEST(t_todo(0), "passing TEST_TODO()");
+	TEST(t_res(1), "passing TEST_TODO() returns 1");
+	test_res = TEST(t_todo(1), "failing TEST_TODO()");
+	TEST(t_res(0), "failing TEST_TODO() returns 0");
+	test_res = TEST(t_skip(), "test_skip()");
+	TEST(check_int(test_res, ==, 1), "skipped test returns 1");
+	test_res = TEST(t_skip_todo(), "test_skip() inside TEST_TODO()");
+	TEST(t_res(1), "test_skip() inside TEST_TODO() returns 1");
+	test_res = TEST(t_todo_after_fail(), "TEST_TODO() after failing check");
+	TEST(check_int(test_res, ==, 0), "TEST_TODO() after failing check returns 0");
+	test_res = TEST(t_fail_after_todo(), "failing check after TEST_TODO()");
+	TEST(check_int(test_res, ==, 0), "failing check after TEST_TODO() returns 0");
+	TEST(t_messages(), "messages from failing string and char comparison");
+	test_res = TEST(t_empty(), "test with no checks");
+	TEST(check_int(test_res, ==, 0), "test with no checks returns 0");
+
+	return test_done();
+}
diff --git a/t/unit-tests/t-ctype.c b/t/unit-tests/t-ctype.c
new file mode 100644
index 0000000..d6ac1fe
--- /dev/null
+++ b/t/unit-tests/t-ctype.c
@@ -0,0 +1,53 @@
+#include "test-lib.h"
+
+#define TEST_CHAR_CLASS(class, string) do { \
+	size_t len = ARRAY_SIZE(string) - 1 + \
+		BUILD_ASSERT_OR_ZERO(ARRAY_SIZE(string) > 0) + \
+		BUILD_ASSERT_OR_ZERO(sizeof(string[0]) == sizeof(char)); \
+	int skip = test__run_begin(); \
+	if (!skip) { \
+		for (int i = 0; i < 256; i++) { \
+			if (!check_int(class(i), ==, !!memchr(string, i, len)))\
+				test_msg("      i: 0x%02x", i); \
+		} \
+		check(!class(EOF)); \
+	} \
+	test__run_end(!skip, TEST_LOCATION(), #class " works"); \
+} while (0)
+
+#define DIGIT "0123456789"
+#define LOWER "abcdefghijklmnopqrstuvwxyz"
+#define UPPER "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+#define PUNCT "!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~"
+#define ASCII \
+	"\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f" \
+	"\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f" \
+	"\x20\x21\x22\x23\x24\x25\x26\x27\x28\x29\x2a\x2b\x2c\x2d\x2e\x2f" \
+	"\x30\x31\x32\x33\x34\x35\x36\x37\x38\x39\x3a\x3b\x3c\x3d\x3e\x3f" \
+	"\x40\x41\x42\x43\x44\x45\x46\x47\x48\x49\x4a\x4b\x4c\x4d\x4e\x4f" \
+	"\x50\x51\x52\x53\x54\x55\x56\x57\x58\x59\x5a\x5b\x5c\x5d\x5e\x5f" \
+	"\x60\x61\x62\x63\x64\x65\x66\x67\x68\x69\x6a\x6b\x6c\x6d\x6e\x6f" \
+	"\x70\x71\x72\x73\x74\x75\x76\x77\x78\x79\x7a\x7b\x7c\x7d\x7e\x7f"
+#define CNTRL \
+	"\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f" \
+	"\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f" \
+	"\x7f"
+
+int cmd_main(int argc, const char **argv) {
+	TEST_CHAR_CLASS(isspace, " \n\r\t");
+	TEST_CHAR_CLASS(isdigit, DIGIT);
+	TEST_CHAR_CLASS(isalpha, LOWER UPPER);
+	TEST_CHAR_CLASS(isalnum, LOWER UPPER DIGIT);
+	TEST_CHAR_CLASS(is_glob_special, "*?[\\");
+	TEST_CHAR_CLASS(is_regex_special, "$()*+.?[\\^{|");
+	TEST_CHAR_CLASS(is_pathspec_magic, "!\"#%&',-/:;<=>@_`~");
+	TEST_CHAR_CLASS(isascii, ASCII);
+	TEST_CHAR_CLASS(islower, LOWER);
+	TEST_CHAR_CLASS(isupper, UPPER);
+	TEST_CHAR_CLASS(iscntrl, CNTRL);
+	TEST_CHAR_CLASS(ispunct, PUNCT);
+	TEST_CHAR_CLASS(isxdigit, DIGIT "abcdefABCDEF");
+	TEST_CHAR_CLASS(isprint, LOWER UPPER DIGIT PUNCT " ");
+
+	return test_done();
+}
diff --git a/t/unit-tests/t-mem-pool.c b/t/unit-tests/t-mem-pool.c
new file mode 100644
index 0000000..a0d57df
--- /dev/null
+++ b/t/unit-tests/t-mem-pool.c
@@ -0,0 +1,31 @@
+#include "test-lib.h"
+#include "mem-pool.h"
+
+static void setup_static(void (*f)(struct mem_pool *), size_t block_alloc)
+{
+	struct mem_pool pool = { .block_alloc = block_alloc };
+	f(&pool);
+	mem_pool_discard(&pool, 0);
+}
+
+static void t_calloc_100(struct mem_pool *pool)
+{
+	size_t size = 100;
+	char *buffer = mem_pool_calloc(pool, 1, size);
+	for (size_t i = 0; i < size; i++)
+		check_int(buffer[i], ==, 0);
+	if (!check(pool->mp_block != NULL))
+		return;
+	check(pool->mp_block->next_free != NULL);
+	check(pool->mp_block->end != NULL);
+}
+
+int cmd_main(int argc, const char **argv)
+{
+	TEST(setup_static(t_calloc_100, 1024 * 1024),
+	     "mem_pool_calloc returns 100 zeroed bytes with big block");
+	TEST(setup_static(t_calloc_100, 1),
+	     "mem_pool_calloc returns 100 zeroed bytes with tiny block");
+
+	return test_done();
+}
diff --git a/t/unit-tests/t-prio-queue.c b/t/unit-tests/t-prio-queue.c
new file mode 100644
index 0000000..7a4e578
--- /dev/null
+++ b/t/unit-tests/t-prio-queue.c
@@ -0,0 +1,91 @@
+#include "test-lib.h"
+#include "prio-queue.h"
+
+static int intcmp(const void *va, const void *vb, void *data UNUSED)
+{
+	const int *a = va, *b = vb;
+	return *a - *b;
+}
+
+
+#define MISSING  -1
+#define DUMP	 -2
+#define STACK	 -3
+#define GET	 -4
+#define REVERSE  -5
+
+static int show(int *v)
+{
+	return v ? *v : MISSING;
+}
+
+static void test_prio_queue(int *input, size_t input_size,
+			    int *result, size_t result_size)
+{
+	struct prio_queue pq = { intcmp };
+	int j = 0;
+
+	for (int i = 0; i < input_size; i++) {
+		void *peek, *get;
+		switch(input[i]) {
+		case GET:
+			peek = prio_queue_peek(&pq);
+			get = prio_queue_get(&pq);
+			if (!check(peek == get))
+				return;
+			if (!check_uint(j, <, result_size))
+				break;
+			if (!check_int(result[j], ==, show(get)))
+				test_msg("      j: %d", j);
+			j++;
+			break;
+		case DUMP:
+			while ((peek = prio_queue_peek(&pq))) {
+				get = prio_queue_get(&pq);
+				if (!check(peek == get))
+					return;
+				if (!check_uint(j, <, result_size))
+					break;
+				if (!check_int(result[j], ==, show(get)))
+					test_msg("      j: %d", j);
+				j++;
+			}
+			break;
+		case STACK:
+			pq.compare = NULL;
+			break;
+		case REVERSE:
+			prio_queue_reverse(&pq);
+			break;
+		default:
+			prio_queue_put(&pq, &input[i]);
+			break;
+		}
+	}
+	check_uint(j, ==, result_size);
+	clear_prio_queue(&pq);
+}
+
+#define TEST_INPUT(input, result) \
+	test_prio_queue(input, ARRAY_SIZE(input), result, ARRAY_SIZE(result))
+
+int cmd_main(int argc, const char **argv)
+{
+	TEST(TEST_INPUT(((int []){ 2, 6, 3, 10, 9, 5, 7, 4, 5, 8, 1, DUMP }),
+			((int []){ 1, 2, 3, 4, 5, 5, 6, 7, 8, 9, 10 })),
+	     "prio-queue works for basic input");
+	TEST(TEST_INPUT(((int []){ 6, 2, 4, GET, 5, 3, GET, GET, 1, DUMP }),
+			((int []){ 2, 3, 4, 1, 5, 6 })),
+	     "prio-queue works for mixed put & get commands");
+	TEST(TEST_INPUT(((int []){ 1, 2, GET, GET, GET, 1, 2, GET, GET, GET }),
+			((int []){ 1, 2, MISSING, 1, 2, MISSING })),
+	     "prio-queue works when queue is empty");
+	TEST(TEST_INPUT(((int []){ STACK, 8, 1, 5, 4, 6, 2, 3, DUMP }),
+			((int []){ 3, 2, 6, 4, 5, 1, 8 })),
+	     "prio-queue works when used as a LIFO stack");
+	TEST(TEST_INPUT(((int []){ STACK, 1, 2, 3, 4, 5, 6, REVERSE, DUMP }),
+			((int []){ 1, 2, 3, 4, 5, 6 })),
+	     "prio-queue works when LIFO stack is reversed");
+
+	return test_done();
+}
diff --git a/t/unit-tests/t-strbuf.c b/t/unit-tests/t-strbuf.c
new file mode 100644
index 0000000..de434a4
--- /dev/null
+++ b/t/unit-tests/t-strbuf.c
@@ -0,0 +1,120 @@
+#include "test-lib.h"
+#include "strbuf.h"
+
+/* wrapper that supplies tests with an empty, initialized strbuf */
+static void setup(void (*f)(struct strbuf*, void*), void *data)
+{
+	struct strbuf buf = STRBUF_INIT;
+
+	f(&buf, data);
+	strbuf_release(&buf);
+	check_uint(buf.len, ==, 0);
+	check_uint(buf.alloc, ==, 0);
+}
+
+/* wrapper that supplies tests with a populated, initialized strbuf */
+static void setup_populated(void (*f)(struct strbuf*, void*), char *init_str, void *data)
+{
+	struct strbuf buf = STRBUF_INIT;
+
+	strbuf_addstr(&buf, init_str);
+	check_uint(buf.len, ==, strlen(init_str));
+	f(&buf, data);
+	strbuf_release(&buf);
+	check_uint(buf.len, ==, 0);
+	check_uint(buf.alloc, ==, 0);
+}
+
+static int assert_sane_strbuf(struct strbuf *buf)
+{
+	/* Initialized strbufs should always have a non-NULL buffer */
+	if (!check(!!buf->buf))
+		return 0;
+	/* Buffers should always be NUL-terminated */
+	if (!check_char(buf->buf[buf->len], ==, '\0'))
+		return 0;
+	/*
+	 * Freshly-initialized strbufs may not have a dynamically allocated
+	 * buffer
+	 */
+	if (buf->len == 0 && buf->alloc == 0)
+		return 1;
+	/* alloc must be at least one byte larger than len */
+	return check_uint(buf->len, <, buf->alloc);
+}
+
+static void t_static_init(void)
+{
+	struct strbuf buf = STRBUF_INIT;
+
+	check_uint(buf.len, ==, 0);
+	check_uint(buf.alloc, ==, 0);
+	check_char(buf.buf[0], ==, '\0');
+}
+
+static void t_dynamic_init(void)
+{
+	struct strbuf buf;
+
+	strbuf_init(&buf, 1024);
+	check(assert_sane_strbuf(&buf));
+	check_uint(buf.len, ==, 0);
+	check_uint(buf.alloc, >=, 1024);
+	check_char(buf.buf[0], ==, '\0');
+	strbuf_release(&buf);
+}
+
+static void t_addch(struct strbuf *buf, void *data)
+{
+	const char *p_ch = data;
+	const char ch = *p_ch;
+	size_t orig_alloc = buf->alloc;
+	size_t orig_len = buf->len;
+
+	if (!check(assert_sane_strbuf(buf)))
+		return;
+	strbuf_addch(buf, ch);
+	if (!check(assert_sane_strbuf(buf)))
+		return;
+	if (!(check_uint(buf->len, ==, orig_len + 1) &&
+	      check_uint(buf->alloc, >=, orig_alloc)))
+		return; /* avoid de-referencing buf->buf */
+	check_char(buf->buf[buf->len - 1], ==, ch);
+	check_char(buf->buf[buf->len], ==, '\0');
+}
+
+static void t_addstr(struct strbuf *buf, void *data)
+{
+	const char *text = data;
+	size_t len = strlen(text);
+	size_t orig_alloc = buf->alloc;
+	size_t orig_len = buf->len;
+
+	if (!check(assert_sane_strbuf(buf)))
+		return;
+	strbuf_addstr(buf, text);
+	if (!check(assert_sane_strbuf(buf)))
+		return;
+	if (!(check_uint(buf->len, ==, orig_len + len) &&
+	      check_uint(buf->alloc, >=, orig_alloc) &&
+	      check_uint(buf->alloc, >, orig_len + len) &&
+	      check_char(buf->buf[orig_len + len], ==, '\0')))
+	    return;
+	check_str(buf->buf + orig_len, text);
+}
+
+int cmd_main(int argc, const char **argv)
+{
+	if (!TEST(t_static_init(), "static initialization works"))
+		test_skip_all("STRBUF_INIT is broken");
+	TEST(t_dynamic_init(), "dynamic initialization works");
+	TEST(setup(t_addch, "a"), "strbuf_addch adds char");
+	TEST(setup(t_addch, ""), "strbuf_addch adds NUL char");
+	TEST(setup_populated(t_addch, "initial value", "a"),
+	     "strbuf_addch appends to initial value");
+	TEST(setup(t_addstr, "hello there"), "strbuf_addstr adds string");
+	TEST(setup_populated(t_addstr, "initial value", "hello there"),
+	     "strbuf_addstr appends string to initial value");
+
+	return test_done();
+}
diff --git a/t/unit-tests/test-lib.c b/t/unit-tests/test-lib.c
new file mode 100644
index 0000000..66d6980
--- /dev/null
+++ b/t/unit-tests/test-lib.c
@@ -0,0 +1,407 @@
+#include "test-lib.h"
+
+enum result {
+	RESULT_NONE,
+	RESULT_FAILURE,
+	RESULT_SKIP,
+	RESULT_SUCCESS,
+	RESULT_TODO
+};
+
+static struct {
+	enum result result;
+	int count;
+	unsigned failed :1;
+	unsigned lazy_plan :1;
+	unsigned running :1;
+	unsigned skip_all :1;
+	unsigned todo :1;
+} ctx = {
+	.lazy_plan = 1,
+	.result = RESULT_NONE,
+};
+
+/*
+ * Visual C interpolates the absolute Windows path for `__FILE__`,
+ * but we want to see relative paths, as verified by t0080.
+ * There are other compilers that do the same, and are not for
+ * Windows.
+ */
+#include "dir.h"
+
+static const char *make_relative(const char *location)
+{
+	static char prefix[] = __FILE__, buf[PATH_MAX], *p;
+	static size_t prefix_len;
+	static int need_bs_to_fs = -1;
+
+	/* one-time preparation */
+	if (need_bs_to_fs < 0) {
+		size_t len = strlen(prefix);
+		char needle[] = "t\\unit-tests\\test-lib.c";
+		size_t needle_len = strlen(needle);
+
+		if (len < needle_len)
+			die("unexpected prefix '%s'", prefix);
+
+		/*
+		 * The path could be relative (t/unit-tests/test-lib.c)
+		 * or full (/home/user/git/t/unit-tests/test-lib.c).
+		 * Check the slash between "t" and "unit-tests".
+		 */
+		prefix_len = len - needle_len;
+		if (prefix[prefix_len + 1] == '/') {
+			/* Oh, we're not Windows */
+			for (size_t i = 0; i < needle_len; i++)
+				if (needle[i] == '\\')
+					needle[i] = '/';
+			need_bs_to_fs = 0;
+		} else {
+			need_bs_to_fs = 1;
+		}
+
+		/*
+		 * prefix_len == 0 if the compiler gives paths relative
+		 * to the root of the working tree.  Otherwise, we want
+		 * to see that we did find the needle[] at a directory
+		 * boundary.  Again we rely on that needle[] begins with
+		 * "t" followed by the directory separator.
+		 */
+		if (fspathcmp(needle, prefix + prefix_len) ||
+		    (prefix_len && prefix[prefix_len - 1] != needle[1]))
+			die("unexpected suffix of '%s'", prefix);
+	}
+
+	/*
+	 * Does it not start with the expected prefix?
+	 * Return it as-is without making it worse.
+	 */
+	if (prefix_len && fspathncmp(location, prefix, prefix_len))
+		return location;
+
+	/*
+	 * If we do not need to munge directory separator, we can return
+	 * the substring at the tail of the location.
+	 */
+	if (!need_bs_to_fs)
+		return location + prefix_len;
+
+	/* convert backslashes to forward slashes */
+	strlcpy(buf, location + prefix_len, sizeof(buf));
+	for (p = buf; *p; p++)
+		if (*p == '\\')
+			*p = '/';
+	return buf;
+}
+
+static void msg_with_prefix(const char *prefix, const char *format, va_list ap)
+{
+	fflush(stderr);
+	if (prefix)
+		fprintf(stdout, "%s", prefix);
+	vprintf(format, ap); /* TODO: handle newlines */
+	putc('\n', stdout);
+	fflush(stdout);
+}
+
+void test_msg(const char *format, ...)
+{
+	va_list ap;
+
+	va_start(ap, format);
+	msg_with_prefix("# ", format, ap);
+	va_end(ap);
+}
+
+void test_plan(int count)
+{
+	assert(!ctx.running);
+
+	fflush(stderr);
+	printf("1..%d\n", count);
+	fflush(stdout);
+	ctx.lazy_plan = 0;
+}
+
+int test_done(void)
+{
+	assert(!ctx.running);
+
+	if (ctx.lazy_plan)
+		test_plan(ctx.count);
+
+	return ctx.failed;
+}
+
+void test_skip(const char *format, ...)
+{
+	va_list ap;
+
+	assert(ctx.running);
+
+	ctx.result = RESULT_SKIP;
+	va_start(ap, format);
+	if (format)
+		msg_with_prefix("# skipping test - ", format, ap);
+	va_end(ap);
+}
+
+void test_skip_all(const char *format, ...)
+{
+	va_list ap;
+	const char *prefix;
+
+	if (!ctx.count && ctx.lazy_plan) {
+		/* We have not printed a test plan yet */
+		prefix = "1..0 # SKIP ";
+		ctx.lazy_plan = 0;
+	} else {
+		/* We have already printed a test plan */
+		prefix = "Bail out! # ";
+		ctx.failed = 1;
+	}
+	ctx.skip_all = 1;
+	ctx.result = RESULT_SKIP;
+	va_start(ap, format);
+	msg_with_prefix(prefix, format, ap);
+	va_end(ap);
+}
+
+int test__run_begin(void)
+{
+	assert(!ctx.running);
+
+	ctx.count++;
+	ctx.result = RESULT_NONE;
+	ctx.running = 1;
+
+	return ctx.skip_all;
+}
+
+static void print_description(const char *format, va_list ap)
+{
+	if (format) {
+		fputs(" - ", stdout);
+		vprintf(format, ap);
+	}
+}
+
+int test__run_end(int was_run UNUSED, const char *location, const char *format, ...)
+{
+	va_list ap;
+
+	assert(ctx.running);
+	assert(!ctx.todo);
+
+	fflush(stderr);
+	va_start(ap, format);
+	if (!ctx.skip_all) {
+		switch (ctx.result) {
+		case RESULT_SUCCESS:
+			printf("ok %d", ctx.count);
+			print_description(format, ap);
+			break;
+
+		case RESULT_FAILURE:
+			printf("not ok %d", ctx.count);
+			print_description(format, ap);
+			break;
+
+		case RESULT_TODO:
+			printf("not ok %d", ctx.count);
+			print_description(format, ap);
+			printf(" # TODO");
+			break;
+
+		case RESULT_SKIP:
+			printf("ok %d", ctx.count);
+			print_description(format, ap);
+			printf(" # SKIP");
+			break;
+
+		case RESULT_NONE:
+			test_msg("BUG: test has no checks at %s",
+				 make_relative(location));
+			printf("not ok %d", ctx.count);
+			print_description(format, ap);
+			ctx.result = RESULT_FAILURE;
+			break;
+		}
+	}
+	va_end(ap);
+	ctx.running = 0;
+	if (ctx.skip_all)
+		return 1;
+	putc('\n', stdout);
+	fflush(stdout);
+	ctx.failed |= ctx.result == RESULT_FAILURE;
+
+	return ctx.result != RESULT_FAILURE;
+}
+
+static void test_fail(void)
+{
+	assert(ctx.result != RESULT_SKIP);
+
+	ctx.result = RESULT_FAILURE;
+}
+
+static void test_pass(void)
+{
+	assert(ctx.result != RESULT_SKIP);
+
+	if (ctx.result == RESULT_NONE)
+		ctx.result = RESULT_SUCCESS;
+}
+
+static void test_todo(void)
+{
+	assert(ctx.result != RESULT_SKIP);
+
+	if (ctx.result != RESULT_FAILURE)
+		ctx.result = RESULT_TODO;
+}
+
+int test_assert(const char *location, const char *check, int ok)
+{
+	assert(ctx.running);
+
+	if (ctx.result == RESULT_SKIP) {
+		test_msg("skipping check '%s' at %s", check,
+			 make_relative(location));
+		return 1;
+	}
+	if (!ctx.todo) {
+		if (ok) {
+			test_pass();
+		} else {
+			test_msg("check \"%s\" failed at %s", check,
+				 make_relative(location));
+			test_fail();
+		}
+	}
+
+	return !!ok;
+}
+
+void test__todo_begin(void)
+{
+	assert(ctx.running);
+	assert(!ctx.todo);
+
+	ctx.todo = 1;
+}
+
+int test__todo_end(const char *location, const char *check, int res)
+{
+	assert(ctx.running);
+	assert(ctx.todo);
+
+	ctx.todo = 0;
+	if (ctx.result == RESULT_SKIP)
+		return 1;
+	if (res) {
+		test_msg("todo check '%s' succeeded at %s", check,
+			 make_relative(location));
+		test_fail();
+	} else {
+		test_todo();
+	}
+
+	return !res;
+}
+
+int check_bool_loc(const char *loc, const char *check, int ok)
+{
+	return test_assert(loc, check, ok);
+}
+
+union test__tmp test__tmp[2];
+
+int check_int_loc(const char *loc, const char *check, int ok,
+		  intmax_t a, intmax_t b)
+{
+	int ret = test_assert(loc, check, ok);
+
+	if (!ret) {
+		test_msg("   left: %"PRIdMAX, a);
+		test_msg("  right: %"PRIdMAX, b);
+	}
+
+	return ret;
+}
+
+int check_uint_loc(const char *loc, const char *check, int ok,
+		   uintmax_t a, uintmax_t b)
+{
+	int ret = test_assert(loc, check, ok);
+
+	if (!ret) {
+		test_msg("   left: %"PRIuMAX, a);
+		test_msg("  right: %"PRIuMAX, b);
+	}
+
+	return ret;
+}
+
+static void print_one_char(char ch, char quote)
+{
+	if ((unsigned char)ch < 0x20u || ch == 0x7f) {
+		/* TODO: improve handling of \a, \b, \f ... */
+		printf("\\%03o", (unsigned char)ch);
+	} else {
+		if (ch == '\\' || ch == quote)
+			putc('\\', stdout);
+		putc(ch, stdout);
+	}
+}
+
+static void print_char(const char *prefix, char ch)
+{
+	printf("# %s: '", prefix);
+	print_one_char(ch, '\'');
+	fputs("'\n", stdout);
+}
+
+int check_char_loc(const char *loc, const char *check, int ok, char a, char b)
+{
+	int ret = test_assert(loc, check, ok);
+
+	if (!ret) {
+		fflush(stderr);
+		print_char("   left", a);
+		print_char("  right", b);
+		fflush(stdout);
+	}
+
+	return ret;
+}
+
+static void print_str(const char *prefix, const char *str)
+{
+	printf("# %s: ", prefix);
+	if (!str) {
+		fputs("NULL\n", stdout);
+	} else {
+		putc('"', stdout);
+		while (*str)
+			print_one_char(*str++, '"');
+		fputs("\"\n", stdout);
+	}
+}
+
+int check_str_loc(const char *loc, const char *check,
+		  const char *a, const char *b)
+{
+	int ok = (!a && !b) || (a && b && !strcmp(a, b));
+	int ret = test_assert(loc, check, ok);
+
+	if (!ret) {
+		fflush(stderr);
+		print_str("   left", a);
+		print_str("  right", b);
+		fflush(stdout);
+	}
+
+	return ret;
+}
diff --git a/t/unit-tests/test-lib.h b/t/unit-tests/test-lib.h
new file mode 100644
index 0000000..a8f07ae
--- /dev/null
+++ b/t/unit-tests/test-lib.h
@@ -0,0 +1,149 @@
+#ifndef TEST_LIB_H
+#define TEST_LIB_H
+
+#include "git-compat-util.h"
+
+/*
+ * Run a test function, returns 1 if the test succeeds, 0 if it
+ * fails. If test_skip_all() has been called then the test will not be
+ * run. The description for each test should be unique. For example:
+ *
+ *  TEST(test_something(arg1, arg2), "something %d %d", arg1, arg2)
+ */
+#define TEST(t, ...)					\
+	test__run_end(test__run_begin() ? 0 : (t, 1),	\
+		      TEST_LOCATION(),  __VA_ARGS__)
+
+/*
+ * Print a test plan, should be called before any tests. If the number
+ * of tests is not known in advance test_done() will automatically
+ * print a plan at the end of the test program.
+ */
+void test_plan(int count);
+
+/*
+ * test_done() must be called at the end of main(). It will print the
+ * plan if plan() was not called at the beginning of the test program
+ * and returns the exit code for the test program.
+ */
+int test_done(void);
+
+/* Skip the current test. */
+__attribute__((format (printf, 1, 2)))
+void test_skip(const char *format, ...);
+
+/* Skip all remaining tests. */
+__attribute__((format (printf, 1, 2)))
+void test_skip_all(const char *format, ...);
+
+/* Print a diagnostic message to stdout. */
+__attribute__((format (printf, 1, 2)))
+void test_msg(const char *format, ...);
+
+/*
+ * Test checks are built around test_assert(). checks return 1 on
+ * success, 0 on failure. If any check fails then the test will fail. To
+ * create a custom check define a function that wraps test_assert() and
+ * a macro to wrap that function to provide a source location and
+ * stringified arguments. Custom checks that take pointer arguments
+ * should be careful to check that they are non-NULL before
+ * dereferencing them. For example:
+ *
+ *  static int check_oid_loc(const char *loc, const char *check,
+ *			     struct object_id *a, struct object_id *b)
+ *  {
+ *	    int res = test_assert(loc, check, a && b && oideq(a, b));
+ *
+ *	    if (!res) {
+ *		    test_msg("   left: %s", a ? oid_to_hex(a) : "NULL";
+ *		    test_msg("  right: %s", b ? oid_to_hex(a) : "NULL";
+ *
+ *	    }
+ *	    return res;
+ *  }
+ *
+ *  #define check_oid(a, b) \
+ *	    check_oid_loc(TEST_LOCATION(), "oideq("#a", "#b")", a, b)
+ */
+int test_assert(const char *location, const char *check, int ok);
+
+/* Helper macro to pass the location to checks */
+#define TEST_LOCATION() TEST__MAKE_LOCATION(__LINE__)
+
+/* Check a boolean condition. */
+#define check(x)				\
+	check_bool_loc(TEST_LOCATION(), #x, x)
+int check_bool_loc(const char *loc, const char *check, int ok);
+
+/*
+ * Compare two integers. Prints a message with the two values if the
+ * comparison fails. NB this is not thread safe.
+ */
+#define check_int(a, op, b)						\
+	(test__tmp[0].i = (a), test__tmp[1].i = (b),			\
+	 check_int_loc(TEST_LOCATION(), #a" "#op" "#b,			\
+		       test__tmp[0].i op test__tmp[1].i,		\
+		       test__tmp[0].i, test__tmp[1].i))
+int check_int_loc(const char *loc, const char *check, int ok,
+		  intmax_t a, intmax_t b);
+
+/*
+ * Compare two unsigned integers. Prints a message with the two values
+ * if the comparison fails. NB this is not thread safe.
+ */
+#define check_uint(a, op, b)						\
+	(test__tmp[0].u = (a), test__tmp[1].u = (b),			\
+	 check_uint_loc(TEST_LOCATION(), #a" "#op" "#b,			\
+			test__tmp[0].u op test__tmp[1].u,		\
+			test__tmp[0].u, test__tmp[1].u))
+int check_uint_loc(const char *loc, const char *check, int ok,
+		   uintmax_t a, uintmax_t b);
+
+/*
+ * Compare two chars. Prints a message with the two values if the
+ * comparison fails. NB this is not thread safe.
+ */
+#define check_char(a, op, b)						\
+	(test__tmp[0].c = (a), test__tmp[1].c = (b),			\
+	 check_char_loc(TEST_LOCATION(), #a" "#op" "#b,			\
+			test__tmp[0].c op test__tmp[1].c,		\
+			test__tmp[0].c, test__tmp[1].c))
+int check_char_loc(const char *loc, const char *check, int ok,
+		   char a, char b);
+
+/* Check whether two strings are equal. */
+#define check_str(a, b)							\
+	check_str_loc(TEST_LOCATION(), "!strcmp("#a", "#b")", a, b)
+int check_str_loc(const char *loc, const char *check,
+		  const char *a, const char *b);
+
+/*
+ * Wrap a check that is known to fail. If the check succeeds then the
+ * test will fail. Returns 1 if the check fails, 0 if it
+ * succeeds. For example:
+ *
+ *  TEST_TODO(check(0));
+ */
+#define TEST_TODO(check) \
+	(test__todo_begin(), test__todo_end(TEST_LOCATION(), #check, check))
+
+/* Private helpers */
+
+#define TEST__STR(x) #x
+#define TEST__MAKE_LOCATION(line) __FILE__ ":" TEST__STR(line)
+
+union test__tmp {
+	intmax_t i;
+	uintmax_t u;
+	char c;
+};
+
+extern union test__tmp test__tmp[2];
+
+int test__run_begin(void);
+__attribute__((format (printf, 3, 4)))
+int test__run_end(int, const char *, const char *, ...);
+void test__todo_begin(void);
+int test__todo_end(const char *, const char *, int);
+
+#endif /* TEST_LIB_H */
diff --git a/t/valgrind/valgrind.sh b/t/valgrind/valgrind.sh
index 669ebaf..3c8ee19 100755
--- a/t/valgrind/valgrind.sh
+++ b/t/valgrind/valgrind.sh
@@ -23,7 +23,7 @@ memcheck)
 	VALGRIND_MAJOR=$(expr "$VALGRIND_VERSION" : '[^0-9]*\([0-9]*\)')
 	VALGRIND_MINOR=$(expr "$VALGRIND_VERSION" : '[^0-9]*[0-9]*\.\([0-9]*\)')
 	test 3 -gt "$VALGRIND_MAJOR" ||
-	test 3 -eq "$VALGRIND_MAJOR" -a 4 -gt "$VALGRIND_MINOR" ||
+	{ test 3 -eq "$VALGRIND_MAJOR" && test 4 -gt "$VALGRIND_MINOR"; } ||
 	TOOL_OPTIONS="$TOOL_OPTIONS --track-origins=yes"
 	;;
 *)