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-rwxr-xr-xcontrib/subtree/git-subtree.sh21
1 files changed, 19 insertions, 2 deletions
diff --git a/contrib/subtree/git-subtree.sh b/contrib/subtree/git-subtree.sh
index 23dd04cbe8..1c157dbd95 100755
--- a/contrib/subtree/git-subtree.sh
+++ b/contrib/subtree/git-subtree.sh
@@ -541,6 +541,7 @@ copy_or_skip () {
nonidentical=
p=
gotparents=
+ copycommit=
for parent in $newparents
do
ptree=$(toptree_for_commit $parent) || exit $?
@@ -548,7 +549,24 @@ copy_or_skip () {
if test "$ptree" = "$tree"
then
# an identical parent could be used in place of this rev.
- identical="$parent"
+ if test -n "$identical"
+ then
+ # if a previous identical parent was found, check whether
+ # one is already an ancestor of the other
+ mergebase=$(git merge-base $identical $parent)
+ if test "$identical" = "$mergebase"
+ then
+ # current identical commit is an ancestor of parent
+ identical="$parent"
+ elif test "$parent" != "$mergebase"
+ then
+ # no common history; commit must be copied
+ copycommit=1
+ fi
+ else
+ # first identical parent detected
+ identical="$parent"
+ fi
else
nonidentical="$parent"
fi
@@ -571,7 +589,6 @@ copy_or_skip () {
fi
done
- copycommit=
if test -n "$identical" && test -n "$nonidentical"
then
extras=$(git rev-list --count $identical..$nonidentical)