bdff97a3f6
"git rebase A B" where B is not a commit should behave as if the
HEAD got detached at B and then the detached HEAD got rebased on top
of A. A bug however overwrites the current branch to point at B,
when B is a descendant of A (i.e. the rebase ends up being a
fast-forward). See [1] for the original bug report.
The callstack from checkout_up_to_date() is the following:
cmd_rebase()
-> checkout_up_to_date()
-> reset_head()
-> update_refs()
-> update_ref()
When B is not a valid branch but an oid, rebase sets the head_name
of rebase_options to NULL. This value gets passed down this call
chain through the branch member of reset_head_opts also getting set
to NULL all the way to update_refs().
Then update_refs() checks ropts.branch to decide whether or not to switch
branches. If ropts.branch is NULL, it calls update_ref() to update HEAD.
At this point however, from rebase's point of view, we want a detached
HEAD. But, since checkout_up_to_date() does not set the RESET_HEAD_DETACH
flag, the update_ref() call will deference HEAD and update the branch its
pointing to. We want the HEAD detached at B instead.
Fix this bug by adding the RESET_HEAD_DETACH flag in
checkout_up_to_date if B is not a valid branch, so that once
reset_head() calls update_refs(), it calls update_ref() with
REF_NO_DEREF which updates HEAD directly intead of deferencing it
and updating the branch that HEAD points to.
Also add a test to ensure the correct behavior.
[1] https://lore.kernel.org/git/YiokTm3GxIZQQUow@newk/
Reported-by: Michael McClimon <michael@mcclimon.org>
Signed-off-by: John Cai <johncai86@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
445 lines
12 KiB
Bash
Executable File
445 lines
12 KiB
Bash
Executable File
#!/bin/sh
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#
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# Copyright (c) 2005 Amos Waterland
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#
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test_description='git rebase assorted tests
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This test runs git rebase and checks that the author information is not lost
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among other things.
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'
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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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GIT_AUTHOR_NAME=author@name
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GIT_AUTHOR_EMAIL=bogus@email@address
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export GIT_AUTHOR_NAME GIT_AUTHOR_EMAIL
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test_expect_success 'prepare repository with topic branches' '
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test_commit "Add A." A First First &&
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git checkout -b force-3way &&
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echo Dummy >Y &&
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git update-index --add Y &&
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git commit -m "Add Y." &&
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git checkout -b filemove &&
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git reset --soft main &&
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mkdir D &&
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git mv A D/A &&
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git commit -m "Move A." &&
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git checkout -b my-topic-branch main &&
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test_commit "Add B." B Second Second &&
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git checkout -f main &&
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echo Third >>A &&
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git update-index A &&
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git commit -m "Modify A." &&
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git checkout -b side my-topic-branch &&
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echo Side >>C &&
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git add C &&
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git commit -m "Add C" &&
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git checkout -f my-topic-branch &&
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git tag topic
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'
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test_expect_success 'rebase on dirty worktree' '
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echo dirty >>A &&
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test_must_fail git rebase main
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'
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test_expect_success 'rebase on dirty cache' '
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git add A &&
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test_must_fail git rebase main
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'
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test_expect_success 'rebase against main' '
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git reset --hard HEAD &&
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git rebase main
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'
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test_expect_success 'rebase sets ORIG_HEAD to pre-rebase state' '
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git checkout -b orig-head topic &&
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pre="$(git rev-parse --verify HEAD)" &&
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git rebase main &&
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test_cmp_rev "$pre" ORIG_HEAD &&
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test_cmp_rev ! "$pre" HEAD
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'
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test_expect_success 'rebase, with <onto> and <upstream> specified as :/quuxery' '
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test_when_finished "git branch -D torebase" &&
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git checkout -b torebase my-topic-branch^ &&
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upstream=$(git rev-parse ":/Add B") &&
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onto=$(git rev-parse ":/Add A") &&
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git rebase --onto $onto $upstream &&
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git reset --hard my-topic-branch^ &&
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git rebase --onto ":/Add A" ":/Add B" &&
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git checkout my-topic-branch
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'
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test_expect_success 'the rebase operation should not have destroyed author information' '
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! (git log | grep "Author:" | grep "<>")
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'
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test_expect_success 'the rebase operation should not have destroyed author information (2)' "
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git log -1 |
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grep 'Author: $GIT_AUTHOR_NAME <$GIT_AUTHOR_EMAIL>'
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"
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test_expect_success 'HEAD was detached during rebase' '
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test $(git rev-parse HEAD@{1}) != $(git rev-parse my-topic-branch@{1})
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'
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test_expect_success 'rebase from ambiguous branch name' '
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git checkout -b topic side &&
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git rebase main
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'
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test_expect_success 'rebase off of the previous branch using "-"' '
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git checkout main &&
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git checkout HEAD^ &&
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git rebase @{-1} >expect.messages &&
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git merge-base main HEAD >expect.forkpoint &&
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git checkout main &&
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git checkout HEAD^ &&
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git rebase - >actual.messages &&
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git merge-base main HEAD >actual.forkpoint &&
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test_cmp expect.forkpoint actual.forkpoint &&
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# the next one is dubious---we may want to say "-",
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# instead of @{-1}, in the message
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test_cmp expect.messages actual.messages
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'
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test_expect_success 'rebase a single mode change' '
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git checkout main &&
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git branch -D topic &&
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echo 1 >X &&
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git add X &&
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test_tick &&
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git commit -m prepare &&
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git checkout -b modechange HEAD^ &&
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echo 1 >X &&
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git add X &&
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test_chmod +x A &&
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test_tick &&
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git commit -m modechange &&
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GIT_TRACE=1 git rebase main
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'
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test_expect_success 'rebase is not broken by diff.renames' '
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test_config diff.renames copies &&
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git checkout filemove &&
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GIT_TRACE=1 git rebase force-3way
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'
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test_expect_success 'setup: recover' '
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test_might_fail git rebase --abort &&
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git reset --hard &&
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git checkout modechange
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'
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test_expect_success 'Show verbose error when HEAD could not be detached' '
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>B &&
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test_when_finished "rm -f B" &&
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test_must_fail git rebase topic 2>output.err >output.out &&
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test_i18ngrep "The following untracked working tree files would be overwritten by checkout:" output.err &&
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test_i18ngrep B output.err
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'
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test_expect_success 'fail when upstream arg is missing and not on branch' '
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git checkout topic &&
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test_must_fail git rebase
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'
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test_expect_success 'fail when upstream arg is missing and not configured' '
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git checkout -b no-config topic &&
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test_must_fail git rebase
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'
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test_expect_success 'rebase works with format.useAutoBase' '
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test_config format.useAutoBase true &&
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git checkout topic &&
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git rebase main
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'
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test_expect_success 'default to common base in @{upstream}s reflog if no upstream arg (--merge)' '
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git checkout -b default-base main &&
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git checkout -b default topic &&
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git config branch.default.remote . &&
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git config branch.default.merge refs/heads/default-base &&
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git rebase --merge &&
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git rev-parse --verify default-base >expect &&
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git rev-parse default~1 >actual &&
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test_cmp expect actual &&
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git checkout default-base &&
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git reset --hard HEAD^ &&
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git checkout default &&
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git rebase --merge &&
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git rev-parse --verify default-base >expect &&
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git rev-parse default~1 >actual &&
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test_cmp expect actual
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'
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test_expect_success 'default to common base in @{upstream}s reflog if no upstream arg (--apply)' '
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git checkout -B default-base main &&
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git checkout -B default topic &&
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git config branch.default.remote . &&
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git config branch.default.merge refs/heads/default-base &&
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git rebase --apply &&
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git rev-parse --verify default-base >expect &&
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git rev-parse default~1 >actual &&
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test_cmp expect actual &&
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git checkout default-base &&
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git reset --hard HEAD^ &&
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git checkout default &&
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git rebase --apply &&
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git rev-parse --verify default-base >expect &&
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git rev-parse default~1 >actual &&
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test_cmp expect actual
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'
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test_expect_success 'cherry-picked commits and fork-point work together' '
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git checkout default-base &&
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echo Amended >A &&
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git commit -a --no-edit --amend &&
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test_commit B B &&
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test_commit new_B B "New B" &&
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test_commit C C &&
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git checkout default &&
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git reset --hard default-base@{4} &&
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test_commit D D &&
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git cherry-pick -2 default-base^ &&
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test_commit final_B B "Final B" &&
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git rebase &&
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echo Amended >expect &&
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test_cmp expect A &&
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echo "Final B" >expect &&
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test_cmp expect B &&
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echo C >expect &&
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test_cmp expect C &&
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echo D >expect &&
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test_cmp expect D
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'
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test_expect_success 'rebase --apply -q is quiet' '
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git checkout -b quiet topic &&
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git rebase --apply -q main >output.out 2>&1 &&
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test_must_be_empty output.out
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'
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test_expect_success 'rebase --merge -q is quiet' '
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git checkout -B quiet topic &&
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git rebase --merge -q main >output.out 2>&1 &&
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test_must_be_empty output.out
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'
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test_expect_success 'Rebase a commit that sprinkles CRs in' '
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(
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echo "One" &&
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echo "TwoQ" &&
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echo "Three" &&
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echo "FQur" &&
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echo "Five"
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) | q_to_cr >CR &&
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git add CR &&
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test_tick &&
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git commit -a -m "A file with a line with CR" &&
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git tag file-with-cr &&
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git checkout HEAD^0 &&
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git rebase --onto HEAD^^ HEAD^ &&
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git diff --exit-code file-with-cr:CR HEAD:CR
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'
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test_expect_success 'rebase can copy notes' '
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git config notes.rewrite.rebase true &&
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git config notes.rewriteRef "refs/notes/*" &&
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test_commit n1 &&
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test_commit n2 &&
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test_commit n3 &&
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git notes add -m"a note" n3 &&
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git rebase --onto n1 n2 &&
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test "a note" = "$(git notes show HEAD)"
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'
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test_expect_success 'rebase -m can copy notes' '
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git reset --hard n3 &&
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git rebase -m --onto n1 n2 &&
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test "a note" = "$(git notes show HEAD)"
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'
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test_expect_success 'rebase commit with an ancient timestamp' '
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git reset --hard &&
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>old.one && git add old.one && test_tick &&
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git commit --date="@12345 +0400" -m "Old one" &&
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>old.two && git add old.two && test_tick &&
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git commit --date="@23456 +0500" -m "Old two" &&
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>old.three && git add old.three && test_tick &&
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git commit --date="@34567 +0600" -m "Old three" &&
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git cat-file commit HEAD^^ >actual &&
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grep "author .* 12345 +0400$" actual &&
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git cat-file commit HEAD^ >actual &&
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grep "author .* 23456 +0500$" actual &&
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git cat-file commit HEAD >actual &&
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grep "author .* 34567 +0600$" actual &&
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git rebase --onto HEAD^^ HEAD^ &&
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git cat-file commit HEAD >actual &&
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grep "author .* 34567 +0600$" actual
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'
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test_expect_success 'rebase with "From " line in commit message' '
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git checkout -b preserve-from main~1 &&
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cat >From_.msg <<EOF &&
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Somebody embedded an mbox in a commit message
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This is from so-and-so:
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From a@b Mon Sep 17 00:00:00 2001
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From: John Doe <nobody@example.com>
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Date: Sat, 11 Nov 2017 00:00:00 +0000
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Subject: not this message
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something
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EOF
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>From_ &&
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git add From_ &&
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git commit -F From_.msg &&
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git rebase main &&
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git log -1 --pretty=format:%B >out &&
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test_cmp From_.msg out
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'
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test_expect_success 'rebase --apply and --show-current-patch' '
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test_create_repo conflict-apply &&
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(
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cd conflict-apply &&
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test_commit init &&
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echo one >>init.t &&
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git commit -a -m one &&
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echo two >>init.t &&
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git commit -a -m two &&
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git tag two &&
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test_must_fail git rebase --apply -f --onto init HEAD^ &&
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GIT_TRACE=1 git rebase --show-current-patch >/dev/null 2>stderr &&
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grep "show.*$(git rev-parse two)" stderr
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)
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'
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test_expect_success 'rebase --apply and .gitattributes' '
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test_create_repo attributes &&
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(
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cd attributes &&
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test_commit init &&
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git config filter.test.clean "sed -e '\''s/smudged/clean/g'\''" &&
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git config filter.test.smudge "sed -e '\''s/clean/smudged/g'\''" &&
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test_commit second &&
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git checkout -b test HEAD^ &&
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echo "*.txt filter=test" >.gitattributes &&
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git add .gitattributes &&
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test_commit third &&
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echo "This text is smudged." >a.txt &&
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git add a.txt &&
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test_commit fourth &&
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git checkout -b removal HEAD^ &&
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git rm .gitattributes &&
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git add -u &&
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test_commit fifth &&
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git cherry-pick test &&
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git checkout test &&
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git rebase main &&
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grep "smudged" a.txt &&
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git checkout removal &&
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git reset --hard &&
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git rebase main &&
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grep "clean" a.txt
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)
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'
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test_expect_success 'rebase--merge.sh and --show-current-patch' '
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test_create_repo conflict-merge &&
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(
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cd conflict-merge &&
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test_commit init &&
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echo one >>init.t &&
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git commit -a -m one &&
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echo two >>init.t &&
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git commit -a -m two &&
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git tag two &&
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test_must_fail git rebase --merge --onto init HEAD^ &&
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git rebase --show-current-patch >actual.patch &&
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GIT_TRACE=1 git rebase --show-current-patch >/dev/null 2>stderr &&
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grep "show.*REBASE_HEAD" stderr &&
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test "$(git rev-parse REBASE_HEAD)" = "$(git rev-parse two)"
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)
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'
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test_expect_success 'switch to branch checked out here' '
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git checkout main &&
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git rebase main main
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'
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test_expect_success 'switch to branch not checked out' '
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git checkout main &&
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git branch other &&
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git rebase main other
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'
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test_expect_success 'switch to non-branch detaches HEAD' '
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git checkout main &&
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old_main=$(git rev-parse HEAD) &&
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git rebase First Second^0 &&
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test_cmp_rev HEAD Second &&
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test_cmp_rev main $old_main &&
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test_must_fail git symbolic-ref HEAD
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'
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test_expect_success 'refuse to switch to branch checked out elsewhere' '
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git checkout main &&
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git worktree add wt &&
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test_must_fail git -C wt rebase main main 2>err &&
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test_i18ngrep "already checked out" err
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'
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test_expect_success MINGW,SYMLINKS_WINDOWS 'rebase when .git/logs is a symlink' '
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git checkout main &&
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mv .git/logs actual_logs &&
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cmd //c "mklink /D .git\logs ..\actual_logs" &&
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git rebase -f HEAD^ &&
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test -L .git/logs &&
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rm .git/logs &&
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mv actual_logs .git/logs
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'
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test_expect_success 'rebase when inside worktree subdirectory' '
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git init main-wt &&
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(
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cd main-wt &&
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git commit --allow-empty -m "initial" &&
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mkdir -p foo/bar &&
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test_commit foo/bar/baz &&
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mkdir -p a/b &&
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test_commit a/b/c &&
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# create another branch for our other worktree
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git branch other &&
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git worktree add ../other-wt other &&
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cd ../other-wt &&
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# create and cd into a subdirectory
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mkdir -p random/dir &&
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cd random/dir &&
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# now do the rebase
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git rebase --onto HEAD^^ HEAD^ # drops the HEAD^ commit
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)
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'
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test_done
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