[PATCH] Documentation for git-daemon.
[git.git] / git-resolve-script
index 03c15a9..7c0e3d8 100755 (executable)
@@ -6,21 +6,25 @@
 #
 . git-sh-setup-script || die "Not a git archive"
 
-head=$(git-rev-parse --revs-only "$1")
-merge=$(git-rev-parse --revs-only "$2")
-merge_repo="$3"
+usage () {
+       die "git-resolve-script <head> <remote> <merge-message>"
+}
 
 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="$3" || usage
+
 #
 # The remote name is just used for the message,
 # but we do want it.
 #
-if [ -z "$head" -o -z "$merge" -o -z "$merge_repo" ]; then
-       die "git-resolve-script <head> <remote> <merge-repo-name>"
+if [ -z "$head" -o -z "$merge" -o -z "$merge_msg" ]; then
+       usage
 fi
 
 dropheads
@@ -45,9 +49,42 @@ if [ "$common" == "$head" ]; then
        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 $merge_repo"
 result_tree=$(git-write-tree  2> /dev/null)
 if [ $? -ne 0 ]; then
        echo "Simple merge failed, trying Automatic merge"