#
# Resolve two trees.
#
-head="$1"
-merge="$2"
-merge_repo="$3"
+. git-sh-setup-script || die "Not a git archive"
-: ${GIT_DIR=.git}
-: ${GIT_OBJECT_DIRECTORY="${SHA1_FILE_DIRECTORY-"$GIT_DIR/objects"}"}
+usage () {
+ die "git-resolve-script <head> <remote> <merge-message>"
+}
-rm -f "$GIT_DIR"/MERGE_HEAD "$GIT_DIR"/ORIG_HEAD
-echo $head > "$GIT_DIR"/ORIG_HEAD
-echo $merge > "$GIT_DIR"/MERGE_HEAD
+dropheads() {
+ rm -f -- "$GIT_DIR/MERGE_HEAD" \
+ "$GIT_DIR/LAST_MERGE" || exit 1
+}
+
+head=$(git-rev-parse --verify "$1"^0) &&
+merge=$(git-rev-parse --verify "$2"^0) &&
+merge_msg="$3" || usage
#
# The remote name is just used for the message,
# but we do want it.
#
-if [ "$merge_repo" == "" ]; then
- echo "git-resolve-script <head> <remote> <merge-repo-name>"
- exit 1
+if [ -z "$head" -o -z "$merge" -o -z "$merge_msg" ]; then
+ usage
fi
+dropheads
+echo $head > "$GIT_DIR"/ORIG_HEAD
+echo $merge > "$GIT_DIR"/LAST_MERGE
+
common=$(git-merge-base $head $merge)
if [ -z "$common" ]; then
- echo "Unable to find common commit between" $merge $head
- exit 1
+ die "Unable to find common commit between" $merge $head
fi
if [ "$common" == "$merge" ]; then
echo "Already up-to-date. Yeeah!"
+ dropheads
exit 0
fi
if [ "$common" == "$head" ]; then
echo "Updating from $head to $merge."
git-read-tree -u -m $head $merge || exit 1
echo $merge > "$GIT_DIR"/HEAD
- git-diff-tree -p ORIG_HEAD HEAD | git-apply --stat
+ git-diff-tree -p $head $merge | git-apply --stat
+ dropheads
exit 0
fi
-echo "Trying to merge $merge into $head"
+
+# Find an optimum merge base if there are more than one candidates.
+LF='
+'
+common=$(git-merge-base -a $head $merge)
+case "$common" in
+?*"$LF"?*)
+ echo "Trying to find the optimum merge base."
+ G=.tmp-index$$
+ best=
+ best_cnt=-1
+ for c in $common
+ do
+ rm -f $G
+ GIT_INDEX_FILE=$G git-read-tree -m $c $head $merge \
+ 2>/dev/null || continue
+ # Count the paths that are unmerged.
+ cnt=`GIT_INDEX_FILE=$G git-ls-files --unmerged | wc -l`
+ if test $best_cnt -le 0 -o $cnt -le $best_cnt
+ then
+ best=$c
+ best_cnt=$cnt
+ if test "$best_cnt" -eq 0
+ then
+ # Cannot do any better than all trivial merge.
+ break
+ fi
+ fi
+ done
+ rm -f $G
+ common="$best"
+esac
+
+echo "Trying to merge $merge into $head using $common."
+git-update-cache --refresh 2>/dev/null
git-read-tree -u -m $common $head $merge || exit 1
-merge_msg="Merge of $merge_repo"
result_tree=$(git-write-tree 2> /dev/null)
if [ $? -ne 0 ]; then
echo "Simple merge failed, trying Automatic merge"
git-merge-cache -o git-merge-one-file-script -a
if [ $? -ne 0 ]; then
- echo "Automatic merge failed, fix up by hand"
- exit 1
+ echo $merge > "$GIT_DIR"/MERGE_HEAD
+ die "Automatic merge failed, fix up by hand"
fi
- merge_msg="Automatic merge of $merge_repo"
result_tree=$(git-write-tree) || exit 1
fi
result_commit=$(echo "$merge_msg" | git-commit-tree $result_tree -p $head -p $merge)
echo "Committed merge $result_commit"
echo $result_commit > "$GIT_DIR"/HEAD
-git-diff-tree -p ORIG_HEAD HEAD | git-apply --stat
+git-diff-tree -p $head $result_commit | git-apply --stat
+dropheads