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Git 2.27 Release Notes
======================
Updates since v2.26
-------------------
Backward compatibility notes
* When "git describe C" finds that commit C is pointed by a signed or
annotated tag, which records T as its tagname in the object, the
command gives T as its answer. Even if the user renames or moves
such a tag from its natural location in the "refs/tags/" hierarchy,
"git describe C" would still give T as the answer, but in such a
case "git show T^0" would no longer work as expected. There may be
nothing at "refs/tags/T" or even worse there may be a different tag
instead.
Starting from this version, "git describe" will always use the
"long" version, as if the "--long" option were given, when giving
its output based on such a misplaced tag to work around the problem.
* "git pull" issues a warning message until the pull.rebase
configuration variable is explicitly given, which some existing
users may find annoying---those who prefer not to rebase need to
set the variable to false to squelch the warning.
UI, Workflows & Features
* A handful of options to configure SSL when talking to proxies have
been added.
* Smudge/clean conversion filters are now given more information
(e.g. the object of the tree-ish in which the blob being converted
appears, in addition to its path, which has already been given).
* When "git describe C" finds an annotated tag with tagname A to be
the best name to explain commit C, and the tag is stored in a
"wrong" place in the refs/tags hierarchy, e.g. refs/tags/B, the
command gave a warning message but used A (not B) to describe C.
If C is exactly at the tag, the describe output would be "A", but
"git rev-parse A^0" would not be equal as "git rev-parse C^0". The
behavior of the command has been changed to use the "long" form
i.e. A-0-gOBJECTNAME, which is correctly interpreted by rev-parse.
* "git pull" learned to warn when no pull.rebase configuration
exists, and neither --[no-]rebase nor --ff-only is given (which
would result a merge).
* "git p4" learned four new hooks and also "--no-verify" option to
bypass them (and the existing "p4-pre-submit" hook).
* "git pull" shares many options with underlying "git fetch", but
some of them were not documented and some of those that would make
sense to pass down were not passed down.
* "git rebase" learned the "--no-gpg-sign" option to countermand
commit.gpgSign the user may have.
* The output from "git format-patch" uses RFC 2047 encoding for
non-ASCII letters on From: and Subject: headers, so that it can
directly be fed to e-mail programs. A new option has been added
to produce these headers in raw.
* "git log" learned "--show-pulls" that helps pathspec limited
history views; a merge commit that takes the whole change from a
side branch, which is normally omitted from the output, is shown
in addition to the commits that introduce real changes.
* The interactive input from various codepaths are consolidated and
any prompt possibly issued earlier are fflush()ed before we read.
* Allow "git rebase" to reapply all local commits, even if the may be
already in the upstream, without checking first.
* The 'pack.useSparse' configuration variable now defaults to 'true',
enabling an optimization that has been experimental since Git 2.21.
Performance, Internal Implementation, Development Support etc.
* The advise API has been revamped to allow more systematic enumeration of
advice knobs in the future.
* SHA-256 transition continues.
* The code to interface with GnuPG has been refactored.
* "git stash" has kept an escape hatch to use the scripted version
for a few releases, which got stale. It has been removed.
* Enable tests that require GnuPG on Windows.
* Minor test usability improvement.
* Trace2 enhancement to allow logging of the environment variables.
* Test clean-up continues.
* Perf-test update.
* A Windows-specific test element has been made more robust against
misuse from both user's environment and programmer's errors.
Fixes since v2.26
-----------------
* The real_path() convenience function can easily be misused; with a
bit of code refactoring in the callers' side, its use has been
eliminated.
(merge 49d3c4b481 am/real-path-fix later to maint).
* Update "git p4" to work with Python 3.
(merge 6bb40ed20a yz/p4-py3 later to maint).
* The mechanism to prevent "git commit" from making an empty commit
or amending during an interrupted cherry-pick was broken during the
rewrite of "git rebase" in C, which has been corrected.
(merge 430b75f720 pw/advise-rebase-skip later to maint).
* Fix "git checkout --recurse-submodules" of a nested submodule
hierarchy.
(merge 846f34d351 pb/recurse-submodules-fix later to maint).
* The "--fork-point" mode of "git rebase" regressed when the command
was rewritten in C back in 2.20 era, which has been corrected.
(merge f08132f889 at/rebase-fork-point-regression-fix later to maint).
* The import-tars importer (in contrib/fast-import/) used to create
phony files at the top-level of the repository when the archive
contains global PAX headers, which made its own logic to detect and
omit the common leading directory ineffective, which has been
corrected.
(merge c839fcff65 js/import-tars-do-not-make-phony-files-from-pax-headers later to maint).
* Simplify the commit ancestry connectedness check in a partial clone
repository in which "promised" objects are assumed to be obtainable
lazily on-demand from promisor remote repositories.
(merge 2b98478c6f jt/connectivity-check-optim-in-partial-clone later to maint).
* The server-end of the v2 protocol to serve "git clone" and "git
fetch" was not prepared to see a delim packets at unexpected
places, which led to a crash.
(merge cacae4329f jk/harden-protocol-v2-delim-handling later to maint).
* When fed a midx that records no objects, some codepaths tried to
loop from 0 through (num_objects-1), which, due to integer
arithmetic wrapping around, made it nonsense operation with out of
bounds array accesses. The code has been corrected to reject such
an midx file.
(merge 796d61cdc0 dr/midx-avoid-int-underflow later to maint).
* Utitiles run via the run_command() API were not spawned correctly
on Cygwin, when the paths to them are given as a full path with
backslashes.
(merge 05ac8582bc ak/run-command-on-cygwin-fix later to maint).
* "git pull --rebase" tried to run a rebase even after noticing that
the pull results in a fast-forward and no rebase is needed nor
sensible, for the past few years due to a mistake nobody noticed.
(merge fbae70ddc6 en/pull-do-not-rebase-after-fast-forwarding later to maint).
* "git rebase" with the merge backend did not work well when the
rebase.abbreviateCommands configuration was set.
(merge de9f1d3ef4 ag/rebase-merge-allow-ff-under-abbrev-command later to maint).
* The logic to auto-follow tags by "git clone --single-branch" was
not careful to avoid lazy-fetching unnecessary tags, which has been
corrected.
(merge 167a575e2d jk/use-quick-lookup-in-clone-for-tag-following later to maint).
* "git rebase -i" did not leave the reflog entries correctly.
(merge 1f6965f994 en/sequencer-reflog-action later to maint).
* The more aggressive updates to remote-tracking branches we had for
the past 7 years or so were not reflected in the documentation,
which has been corrected.
(merge a44088435c pb/pull-fetch-doc later to maint).
* We've left the command line parsing of "git log :/a/b/" broken for
about a full year without anybody noticing, which has been
corrected.
(merge 0220461071 jc/missing-ref-store-fix later to maint).
* Misc fixes for Windows.
(merge 3efc128cd5 js/mingw-fixes later to maint).
* "git rebase" (again) learns to honor "--no-keep-empty", which lets
the user to discard commits that are empty from the beginning (as
opposed to the ones that become empty because of rebasing). The
interactive rebase also marks commits that are empty in the todo.
(merge 50ed76148a en/rebase-no-keep-empty later to maint).
* Parsing the host part out of URL for the credential helper has been corrected.
(merge 4c5971e18a jk/credential-parsing-end-of-host-in-URL later to maint).
* Other code cleanup, docfix, build fix, etc.
(merge 564956f358 jc/maintain-doc later to maint).
(merge 7422b2a0a1 sg/commit-slab-clarify-peek later to maint).
(merge 9c688735f6 rs/doc-passthru-fetch-options later to maint).
(merge 757c2ba3e2 en/oidset-uninclude-hashmap later to maint).
(merge 8312aa7d74 jc/config-tar later to maint).
(merge d00a5bdd50 ss/submodule-foreach-cb later to maint).
(merge 64d1022e14 ar/test-style-fixes later to maint).
(merge 4a465443a6 ds/doc-clone-filter later to maint).
(merge bb2dbe301b jk/t3419-drop-expensive-tests later to maint).
(merge d3507cc712 js/test-junit-finalization-fix later to maint).
(merge 2149b6748f bc/faq later to maint).
(merge 12dc0879f1 jk/test-cleanup later to maint).
(merge 344420bf0f pb/rebase-doc-typofix later to maint).
(merge 7cd54d37dc dl/wrapper-fix-indentation later to maint).
(merge 78725ebda9 jc/allow-strlen-substitution-in-shell-scripts later to maint).
(merge 2ecfcdecc6 jm/gitweb-fastcgi-utf8 later to maint).
(merge 0740d0a5d3 jk/oid-array-cleanups later to maint).
(merge a1aba0c95c js/t0007-typofix later to maint).
(merge 76ba7fa225 ma/config-doc-fix later to maint).
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