923cd87ac8
The apply_fragments() method of "git apply" can silently apply patches incorrectly if a file has repeating contents. In these cases a three-way merge is capable of applying it correctly in more situations, and will show a conflict rather than applying it incorrectly. However, because the patches apply "successfully" using apply_fragments(), git will never fall back to the merge, even if the "--3way" flag is used, and the user has no way to ensure correctness by forcing the three-way merge method. Change the behavior so that when "--3way" is used, git will always try the three-way merge first and will only fall back to apply_fragments() in cases where blobs are not available or some other error (but not in the case of a merge conflict). Since user-facing results will be different, this has backwards compatibility implications for users depending on the old behavior. In addition, the three-way merge will be slower than direct patch application. Signed-off-by: Jerry Zhang <jerry@skydio.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
184 lines
4.6 KiB
Bash
Executable File
184 lines
4.6 KiB
Bash
Executable File
#!/bin/sh
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test_description='git apply --3way'
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GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
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export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
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. ./test-lib.sh
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print_sanitized_conflicted_diff () {
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git diff HEAD >diff.raw &&
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sed -e '
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/^index /d
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s/^\(+[<>|][<>|][<>|][<>|]*\) .*/\1/
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' diff.raw
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}
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test_expect_success setup '
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test_tick &&
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test_write_lines 1 2 3 4 5 6 7 >one &&
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cat one >two &&
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git add one two &&
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git commit -m initial &&
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git branch side &&
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test_tick &&
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test_write_lines 1 two 3 4 5 six 7 >one &&
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test_write_lines 1 two 3 4 5 6 7 >two &&
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git commit -a -m main &&
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git checkout side &&
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test_write_lines 1 2 3 4 five 6 7 >one &&
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test_write_lines 1 2 3 4 five 6 7 >two &&
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git commit -a -m side &&
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git checkout main
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'
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test_expect_success 'apply without --3way' '
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git diff side^ side >P.diff &&
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# should fail to apply
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git reset --hard &&
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git checkout main^0 &&
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test_must_fail git apply --index P.diff &&
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# should leave things intact
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git diff-files --exit-code &&
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git diff-index --exit-code --cached HEAD
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'
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test_apply_with_3way () {
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# Merging side should be similar to applying this patch
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git diff ...side >P.diff &&
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# The corresponding conflicted merge
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git reset --hard &&
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git checkout main^0 &&
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test_must_fail git merge --no-commit side &&
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git ls-files -s >expect.ls &&
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print_sanitized_conflicted_diff >expect.diff &&
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# should fail to apply
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git reset --hard &&
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git checkout main^0 &&
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test_must_fail git apply --index --3way P.diff &&
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git ls-files -s >actual.ls &&
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print_sanitized_conflicted_diff >actual.diff &&
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# The result should resemble the corresponding merge
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test_cmp expect.ls actual.ls &&
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test_cmp expect.diff actual.diff
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}
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test_expect_success 'apply with --3way' '
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test_apply_with_3way
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'
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test_expect_success 'apply with --3way with merge.conflictStyle = diff3' '
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test_config merge.conflictStyle diff3 &&
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test_apply_with_3way
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'
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test_expect_success 'apply with --3way with rerere enabled' '
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test_config rerere.enabled true &&
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# Merging side should be similar to applying this patch
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git diff ...side >P.diff &&
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# The corresponding conflicted merge
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git reset --hard &&
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git checkout main^0 &&
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test_must_fail git merge --no-commit side &&
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# Manually resolve and record the resolution
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test_write_lines 1 two 3 4 five six 7 >one &&
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git rerere &&
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cat one >expect &&
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# should fail to apply
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git reset --hard &&
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git checkout main^0 &&
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test_must_fail git apply --index --3way P.diff &&
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# but rerere should have replayed the recorded resolution
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test_cmp expect one
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'
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test_expect_success 'apply -3 with add/add conflict setup' '
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git reset --hard &&
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git checkout -b adder &&
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test_write_lines 1 2 3 4 5 6 7 >three &&
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test_write_lines 1 2 3 4 5 6 7 >four &&
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git add three four &&
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git commit -m "add three and four" &&
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git checkout -b another adder^ &&
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test_write_lines 1 2 3 4 5 6 7 >three &&
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test_write_lines 1 2 3 four 5 6 7 >four &&
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git add three four &&
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git commit -m "add three and four" &&
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# Merging another should be similar to applying this patch
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git diff adder...another >P.diff &&
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git checkout adder^0 &&
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test_must_fail git merge --no-commit another &&
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git ls-files -s >expect.ls &&
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print_sanitized_conflicted_diff >expect.diff
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'
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test_expect_success 'apply -3 with add/add conflict' '
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# should fail to apply ...
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git reset --hard &&
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git checkout adder^0 &&
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test_must_fail git apply --index --3way P.diff &&
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# ... and leave conflicts in the index and in the working tree
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git ls-files -s >actual.ls &&
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print_sanitized_conflicted_diff >actual.diff &&
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# The result should resemble the corresponding merge
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test_cmp expect.ls actual.ls &&
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test_cmp expect.diff actual.diff
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'
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test_expect_success 'apply -3 with add/add conflict (dirty working tree)' '
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# should fail to apply ...
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git reset --hard &&
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git checkout adder^0 &&
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echo >>four &&
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cat four >four.save &&
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cat three >three.save &&
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git ls-files -s >expect.ls &&
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test_must_fail git apply --index --3way P.diff &&
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# ... and should not touch anything
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git ls-files -s >actual.ls &&
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test_cmp expect.ls actual.ls &&
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test_cmp four.save four &&
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test_cmp three.save three
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'
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test_expect_success 'apply -3 with ambiguous repeating file' '
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git reset --hard &&
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test_write_lines 1 2 1 2 1 2 1 2 1 2 1 >one_two_repeat &&
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git add one_two_repeat &&
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git commit -m "init one" &&
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test_write_lines 1 2 1 2 1 2 1 2 one 2 1 >one_two_repeat &&
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git commit -a -m "change one" &&
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git diff HEAD~ >Repeat.diff &&
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git reset --hard HEAD~ &&
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test_write_lines 1 2 1 2 1 2 one 2 1 2 one >one_two_repeat &&
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git commit -a -m "change surrounding one" &&
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git apply --index --3way Repeat.diff &&
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test_write_lines 1 2 1 2 1 2 one 2 one 2 one >expect &&
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test_cmp expect one_two_repeat
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'
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test_done
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