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c192f9c865
'git rebase' uses 'git merge' to preserve merges (-p). This preserves
the original merge commit correctly, except when the original merge
commit was created by 'git merge --no-ff'. In this case, 'git rebase'
will fail to preserve the merge, because during 'git rebase', 'git
merge' will simply fast-forward and skip the commit. For example:
B
/ \
A---M
/
---o---O---P---Q
If we try to rebase M onto P, we lose the merge commit and this happens:
A---B
/
---o---O---P---Q
To correct this, we simply do a "no fast-forward" on all merge commits
when rebasing. Since by the time we decided to do a 'git merge' inside
'git rebase', it means there was a merge originally, so 'git merge'
should always create a merge commit regardless of what the merge
branches look like. This way, when rebase M onto P from the above
example, we get:
B
/ \
A---M
/
---o---O---P---Q
Signed-off-by: Andrew Wong <andrew.kw.w@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
126 lines
2.8 KiB
Bash
Executable file
126 lines
2.8 KiB
Bash
Executable file
#!/bin/sh
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#
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# Copyright(C) 2008 Stephen Habermann & Andreas Ericsson
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#
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test_description='git rebase -p should preserve merges
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Run "git rebase -p" and check that merges are properly carried along
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'
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. ./test-lib.sh
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GIT_AUTHOR_EMAIL=bogus_email_address
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export GIT_AUTHOR_EMAIL
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# Clone 1 (trivial merge):
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#
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# A1--A2 <-- origin/master
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# \ \
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# B1--M <-- topic
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# \
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# B2 <-- origin/topic
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#
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# Clone 2 (conflicting merge):
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#
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# A1--A2--B3 <-- origin/master
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# \ \
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# B1------M <-- topic
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# \
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# B2 <-- origin/topic
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#
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# Clone 3 (no-ff merge):
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#
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# A1--A2--B3 <-- origin/master
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# \
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# B1------M <-- topic
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# \ /
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# \--A3 <-- topic2
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# \
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# B2 <-- origin/topic
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#
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# In all cases, 'topic' is rebased onto 'origin/topic'.
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test_expect_success 'setup for merge-preserving rebase' \
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'echo First > A &&
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git add A &&
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git commit -m "Add A1" &&
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git checkout -b topic &&
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echo Second > B &&
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git add B &&
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git commit -m "Add B1" &&
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git checkout -f master &&
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echo Third >> A &&
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git commit -a -m "Modify A2" &&
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git clone ./. clone1 &&
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(cd clone1 &&
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git checkout -b topic origin/topic &&
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git merge origin/master
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) &&
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echo Fifth > B &&
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git add B &&
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git commit -m "Add different B" &&
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git clone ./. clone2 &&
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(
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cd clone2 &&
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git checkout -b topic origin/topic &&
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test_must_fail git merge origin/master &&
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echo Resolved >B &&
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git add B &&
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git commit -m "Merge origin/master into topic"
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) &&
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git clone ./. clone3 &&
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(
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cd clone3 &&
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git checkout -b topic2 origin/topic &&
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echo Sixth > A &&
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git commit -a -m "Modify A3" &&
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git checkout -b topic origin/topic &&
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git merge --no-ff topic2
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) &&
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git checkout topic &&
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echo Fourth >> B &&
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git commit -a -m "Modify B2"
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'
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test_expect_success 'rebase -p fakes interactive rebase' '
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(
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cd clone1 &&
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git fetch &&
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git rebase -p origin/topic &&
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test 1 = $(git rev-list --all --pretty=oneline | grep "Modify A" | wc -l) &&
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test 1 = $(git rev-list --all --pretty=oneline | grep "Merge remote-tracking branch " | wc -l)
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)
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'
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test_expect_success '--continue works after a conflict' '
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(
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cd clone2 &&
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git fetch &&
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test_must_fail git rebase -p origin/topic &&
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test 2 = $(git ls-files B | wc -l) &&
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echo Resolved again > B &&
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test_must_fail git rebase --continue &&
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grep "^@@@ " .git/rebase-merge/patch &&
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git add B &&
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git rebase --continue &&
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test 1 = $(git rev-list --all --pretty=oneline | grep "Modify A" | wc -l) &&
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test 1 = $(git rev-list --all --pretty=oneline | grep "Add different" | wc -l) &&
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test 1 = $(git rev-list --all --pretty=oneline | grep "Merge origin" | wc -l)
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)
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'
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test_expect_success 'rebase -p preserves no-ff merges' '
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(
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cd clone3 &&
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git fetch &&
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git rebase -p origin/topic &&
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test 3 = $(git rev-list --all --pretty=oneline | grep "Modify A" | wc -l) &&
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test 1 = $(git rev-list --all --pretty=oneline | grep "Merge branch" | wc -l)
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)
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'
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test_done
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