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| author | Andrew Wong <andrew.kw.w@gmail.com> | 2011-04-28 00:35:55 -0400 |
|---|---|---|
| committer | Junio C Hamano <gitster@pobox.com> | 2011-04-28 09:56:55 -0700 |
| commit | c192f9c865dbdae48c0400d717581d34cd315fb8 (patch) | |
| tree | 9a12ca5c3d38222b9434727cb3fe3f7ef02f4493 /git-rebase--interactive.sh | |
| parent | 4fec83045bdc53ed9d3ff71ed099e3e6992b5c56 (diff) | |
| download | git-c192f9c865dbdae48c0400d717581d34cd315fb8.tar.gz | |
git-rebase--interactive.sh: preserve-merges fails on merges created with no-ff
'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>
Diffstat (limited to 'git-rebase--interactive.sh')
| -rwxr-xr-x | git-rebase--interactive.sh | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/git-rebase--interactive.sh b/git-rebase--interactive.sh index 5873ba4bc3..c308529a9f 100755 --- a/git-rebase--interactive.sh +++ b/git-rebase--interactive.sh @@ -339,7 +339,7 @@ pick_one_preserving_merges () { # No point in merging the first parent, that's HEAD new_parents=${new_parents# $first_parent} if ! do_with_author output \ - git merge $STRATEGY -m "$msg" $new_parents + git merge --no-ff $STRATEGY -m "$msg" $new_parents then printf "%s\n" "$msg" > "$GIT_DIR"/MERGE_MSG die_with_patch $sha1 "Error redoing merge $sha1" |