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filter-branch: fix behaviour of '-k'

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The option '-k' says that the given commit and _all_ of its ancestors
are kept as-is.

However, if a to-be-rewritten commit branched from an ancestor of an
ancestor of a commit given with '-k', filter-branch would fail.

Example:

	A - B
	  \
	    C

If filter-branch was called with '-k B -s C', it would actually keep
B (and A as its parent), but would rewrite C, and its parent.

Noticed by Johannes Sixt.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Johannes Schindelin 2007-06-05 16:58:13 +01:00 committed by Junio C Hamano
parent c12764b8b7
commit 9840906026
2 changed files with 26 additions and 12 deletions
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29
git-filter-branch.sh
View File

@ -327,11 +327,6 @@ ret=0
mkdir ../map # map old->new commit ids for rewriting parents
# seed with identity mappings for the parents where we start off
for commit in $unchanged; do
echo $commit > ../map/$commit
done
git-rev-list --reverse --topo-order $srcbranch --not $unchanged >../revs
commits=$(cat ../revs | wc -l | tr -d " ")
@ -372,7 +367,8 @@ while read commit; do
parentstr="$parentstr -p $reparent"
done
else
die "assertion failed: parent $parent for commit $commit not found in rewritten ones"
# if it was not rewritten, take the original
parentstr="$parentstr -p $parent"
fi
done
if [ "$filter_parent" ]; then
@ -385,12 +381,21 @@ while read commit; do
tee ../map/$commit
done <../revs
git-update-ref refs/heads/"$dstbranch" $(head -n 1 ../map/$(tail -n 1 ../revs))
if [ "$(cat ../map/$(tail -n 1 ../revs) | wc -l)" -gt 1 ]; then
echo "WARNING: Your commit filter caused the head commit to expand to several rewritten commits. Only the first such commit was recorded as the current $dstbranch head but you will need to resolve the situation now (probably by manually merging the other commits). These are all the commits:" >&2
sed 's/^/ /' ../map/$(tail -n 1 ../revs) >&2
ret=1
fi
src_head=$(tail -n 1 ../revs)
target_head=$(head -n 1 ../map/$src_head)
case "$target_head" in
'')
echo Nothing rewritten
;;
*)
git-update-ref refs/heads/"$dstbranch" $target_head
if [ $(cat ../map/$src_head | wc -l) -gt 1 ]; then
echo "WARNING: Your commit filter caused the head commit to expand to several rewritten commits. Only the first such commit was recorded as the current $dstbranch head but you will need to resolve the situation now (probably by manually merging the other commits). These are all the commits:" >&2
sed 's/^/ /' ../map/$src_head >&2
ret=1
fi
;;
esac
if [ "$filter_tag_name" ]; then
git-for-each-ref --format='%(objectname) %(objecttype) %(refname)' refs/tags |

9
t/t7003-filter-branch.sh
View File

@ -45,4 +45,13 @@ test_expect_success 'test that the file was renamed' '
test d = $(git show H3:doh)
'
git tag oldD H3~4
test_expect_success 'rewrite one branch, keeping a side branch' '
git-filter-branch --tree-filter "mv b boh || :" -k D -s oldD modD
'
test_expect_success 'common ancestor is still common (unchanged)' '
test "$(git-merge-base modD D)" = "$(git-rev-parse B)"
'
test_done