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Diffstat (limited to 't/t6437-submodule-merge.sh')
| -rwxr-xr-x | t/t6437-submodule-merge.sh | 546 |
1 files changed, 546 insertions, 0 deletions
diff --git a/t/t6437-submodule-merge.sh b/t/t6437-submodule-merge.sh new file mode 100755 index 0000000..7a3f1cb --- /dev/null +++ b/t/t6437-submodule-merge.sh @@ -0,0 +1,546 @@ +#!/bin/sh + +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 +. "$TEST_DIRECTORY"/lib-merge.sh + +# +# history +# +# a --- c +# / \ / +# root X +# \ / \ +# b --- d +# + +test_expect_success setup ' + + mkdir sub && + (cd sub && + git init && + echo original > file && + git add file && + test_tick && + git commit -m sub-root) && + git add sub && + test_tick && + git commit -m root && + + git checkout -b a main && + (cd sub && + echo A > file && + git add file && + test_tick && + git commit -m sub-a) && + git add sub && + test_tick && + git commit -m a && + + git checkout -b b main && + (cd sub && + echo B > file && + git add file && + test_tick && + git commit -m sub-b) && + git add sub && + test_tick && + git commit -m b && + + git checkout -b c a && + git merge -s ours b && + + git checkout -b d b && + git merge -s ours a +' + +# History setup +# +# b +# / \ +# init -- a d +# \ \ / +# g c +# +# a in the main repository records to sub-a in the submodule and +# analogous b and c. d should be automatically found by merging c into +# b in the main repository. +test_expect_success 'setup for merge search' ' + mkdir merge-search && + (cd merge-search && + git init && + mkdir sub && + (cd sub && + git init && + echo "file-a" > file-a && + git add file-a && + git commit -m "sub-a" && + git branch sub-a) && + git commit --allow-empty -m init && + git branch init && + git add sub && + git commit -m "a" && + git branch a && + + git checkout -b b && + (cd sub && + git checkout -b sub-b && + echo "file-b" > file-b && + git add file-b && + git commit -m "sub-b") && + git commit -a -m "b" && + + git checkout -b c a && + (cd sub && + git checkout -b sub-c sub-a && + echo "file-c" > file-c && + git add file-c && + git commit -m "sub-c") && + git commit -a -m "c") +' + +test_expect_success 'merging should conflict for non fast-forward' ' + test_when_finished "git -C merge-search reset --hard" && + (cd merge-search && + git checkout -b test-nonforward-a b && + if test "$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 && + git merge sub-c) && + git commit -a -m "d" && + git branch test b && + + git checkout -b g init && + (cd sub && + git checkout -b sub-g sub-c) && + git add sub && + git commit -a -m "g") +' + +test_expect_success 'merge with one side as a fast-forward of the other' ' + (cd merge-search && + git checkout -b test-forward b && + git merge d && + git ls-tree test-forward sub | cut -f1 | cut -f3 -d" " > actual && + (cd sub && + git rev-parse sub-d > ../expect) && + test_cmp expect actual) +' + +test_expect_success 'merging should conflict for non fast-forward (resolution exists)' ' + (cd merge-search && + git checkout -b test-nonforward-b b && + (cd sub && + 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 $(cat expect) actual > /dev/null && + git reset --hard) +' + +test_expect_success 'merging should fail for ambiguous common parent' ' + (cd merge-search && + git checkout -b test-ambiguous b && + (cd sub && + git checkout -b ambiguous sub-b && + git merge sub-c && + if test "$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 $(cat expect2) actual > /dev/null && + git reset --hard) +' + +# in a situation like this +# +# submodule tree: +# +# sub-a --- sub-b --- sub-d +# +# main tree: +# +# e (sub-a) +# / +# bb (sub-b) +# \ +# f (sub-d) +# +# A merge between e and f should fail because one of the submodule +# commits (sub-a) does not descend from the submodule merge-base (sub-b). +# +test_expect_success 'merging should fail for changes that are backwards' ' + (cd merge-search && + git checkout -b bb a && + (cd sub && + git checkout sub-b) && + git commit -a -m "bb" && + + git checkout -b e bb && + (cd sub && + git checkout sub-a) && + git commit -a -m "e" && + + git checkout -b f bb && + (cd sub && + git checkout sub-d) && + git commit -a -m "f" && + + git checkout -b test-backward e && + test_must_fail git merge f 2>actual && + if test "$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) +' + + +# Check that the conflicting submodule is detected when it is +# in the common ancestor. status should be 'U00...00" +test_expect_success 'git submodule status should display the merge conflict properly with merge base' ' + (cd merge-search && + cat >.gitmodules <<EOF && +[submodule "sub"] + path = sub + url = $TRASH_DIRECTORY/sub +EOF + cat >expect <<EOF && +U$ZERO_OID sub +EOF + git submodule status > actual && + test_cmp expect actual && + git reset --hard) +' + +# Check that the conflicting submodule is detected when it is +# not in the common ancestor. status should be 'U00...00" +test_expect_success 'git submodule status should display the merge conflict properly without merge-base' ' + (cd merge-search && + git checkout -b test-no-merge-base g && + test_must_fail git merge b && + cat >.gitmodules <<EOF && +[submodule "sub"] + path = sub + url = $TRASH_DIRECTORY/sub +EOF + cat >expect <<EOF && +U$ZERO_OID sub +EOF + git submodule status > actual && + test_cmp expect actual && + git reset --hard) +' + + +test_expect_success 'merging with a modify/modify conflict between merge bases' ' + git reset --hard HEAD && + git checkout -b test2 c && + git merge d +' + +# canonical criss-cross history in top and submodule +test_expect_success 'setup for recursive merge with submodule' ' + mkdir merge-recursive && + (cd merge-recursive && + git init && + mkdir sub && + (cd sub && + git init && + test_commit a && + git checkout -b sub-b main && + test_commit b && + 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 main) && + git add sub && + git commit -m a && + git checkout -b top-b main && + (cd sub && git checkout sub-b) && + git add sub && + git commit -m b && + git checkout -b top-c main && + (cd sub && git checkout sub-c) && + git add sub && + git commit -m c && + git checkout -b top-bc top-b && + git merge -s ours --no-commit top-c && + (cd sub && git checkout sub-bc) && + git add sub && + git commit -m bc && + git checkout -b top-cb top-c && + git merge -s ours --no-commit top-b && + (cd sub && git checkout sub-cb) && + git add sub && + git commit -m cb) +' + +# merge should leave submodule unmerged in index +test_expect_success 'recursive merge with submodule' ' + (cd merge-recursive && + test_must_fail git merge top-bc && + echo "160000 $(git rev-parse top-cb:sub) 2 sub" > expect2 && + echo "160000 $(git rev-parse top-bc:sub) 3 sub" > expect3 && + git ls-files -u > actual && + grep "$(cat expect2)" actual > /dev/null && + grep "$(cat expect3)" actual > /dev/null) +' + +# File/submodule conflict +# Commit O: <empty> +# Commit A: path (submodule) +# Commit B: path +# Expected: path/ is submodule and file contents for B's path are somewhere + +test_expect_success 'setup file/submodule conflict' ' + git init file-submodule && + ( + cd file-submodule && + + git commit --allow-empty -m O && + + git branch A && + git branch B && + + git checkout B && + echo content >path && + git add path && + git commit -m B && + + git checkout A && + git init path && + test_commit -C path world && + git submodule add ./path && + git commit -m A + ) +' + +test_expect_merge_algorithm failure success 'file/submodule conflict' ' + test_when_finished "git -C file-submodule reset --hard" && + ( + cd file-submodule && + + git checkout A^0 && + test_must_fail git merge B^0 && + + git ls-files -s >out && + test_line_count = 3 out && + git ls-files -u >out && + test_line_count = 2 out && + + # path/ is still a submodule + test_path_is_dir path/.git && + + # There is a submodule at "path", so B:path cannot be written + # there. We expect it to be written somewhere in the same + # directory, though, so just grep for its content in all + # files, and ignore "grep: path: Is a directory" message + echo Checking if contents from B:path showed up anywhere && + grep -q content * 2>/dev/null + ) +' + +test_expect_success 'file/submodule conflict; merge --abort works afterward' ' + test_when_finished "git -C file-submodule reset --hard" && + ( + cd file-submodule && + + git checkout A^0 && + test_must_fail git merge B^0 >out 2>err && + + test_path_is_file .git/MERGE_HEAD && + git merge --abort + ) +' + +# Directory/submodule conflict +# Commit O: <empty> +# Commit A: path (submodule), with sole tracked file named 'world' +# Commit B1: path/file +# Commit B2: path/world +# +# Expected from merge of A & B1: +# Contents under path/ from commit B1 are renamed elsewhere; we do not +# want to write files from one of our tracked directories into a submodule +# +# Expected from merge of A & B2: +# Similar to last merge, but with a slight twist: we don't want paths +# under the submodule to be treated as untracked or in the way. + +test_expect_success 'setup directory/submodule conflict' ' + git init directory-submodule && + ( + cd directory-submodule && + + git commit --allow-empty -m O && + + git branch A && + git branch B1 && + git branch B2 && + + git checkout B1 && + mkdir path && + echo contents >path/file && + git add path/file && + git commit -m B1 && + + git checkout B2 && + mkdir path && + echo contents >path/world && + git add path/world && + git commit -m B2 && + + git checkout A && + git init path && + test_commit -C path hello world && + git submodule add ./path && + git commit -m A + ) +' + +test_expect_failure 'directory/submodule conflict; keep submodule clean' ' + test_when_finished "git -C directory-submodule reset --hard" && + ( + cd directory-submodule && + + git checkout A^0 && + test_must_fail git merge B1^0 && + + git ls-files -s >out && + test_line_count = 3 out && + git ls-files -u >out && + test_line_count = 1 out && + + # path/ is still a submodule + test_path_is_dir path/.git && + + echo Checking if contents from B1:path/file showed up && + # Would rather use grep -r, but that is GNU extension... + git ls-files -co | xargs grep -q contents 2>/dev/null && + + # However, B1:path/file should NOT have shown up at path/file, + # because we should not write into the submodule + test_path_is_missing path/file + ) +' + +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" && + ( + cd directory-submodule && + + git checkout A^0 && + test_must_fail git merge B2^0 >out 2>err && + + # We do not want files within the submodule to prevent the + # merge from starting; we should not be writing to such paths + # anyway. + test_grep ! "refusing to lose untracked file at" err + ) +' + +test_expect_failure 'directory/submodule conflict; merge --abort works afterward' ' + test_when_finished "git -C directory-submodule/path reset --hard" && + test_when_finished "git -C directory-submodule reset --hard" && + ( + cd directory-submodule && + + git checkout A^0 && + test_must_fail git merge B2^0 && + test_path_is_file .git/MERGE_HEAD && + + # merge --abort should succeed, should clear .git/MERGE_HEAD, + # and should not leave behind any conflicted files + git merge --abort && + test_path_is_missing .git/MERGE_HEAD && + git ls-files -u >conflicts && + test_must_be_empty conflicts + ) +' + +# 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 |