Big tool rename.
[git.git] / git-resolve.sh
diff --git a/git-resolve.sh b/git-resolve.sh
new file mode 100755 (executable)
index 0000000..1f559d8
--- /dev/null
@@ -0,0 +1,104 @@
+#!/bin/sh
+#
+# Copyright (c) 2005 Linus Torvalds
+#
+# Resolve two trees.
+#
+. git-sh-setup || die "Not a git archive"
+
+usage () {
+       die "git-resolve <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_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
+       die "Unable to find common commit between" $merge $head
+fi
+
+case "$common" in
+"$merge")
+       echo "Already up-to-date. Yeeah!"
+       dropheads
+       exit 0
+       ;;
+"$head")
+       echo "Updating from $head to $merge."
+       git-read-tree -u -m $head $merge || exit 1
+       echo $merge > "$GIT_DIR"/HEAD
+       git-diff-tree -p $head $merge | git-apply --stat
+       dropheads
+       exit 0
+       ;;
+esac
+
+# Find an optimum merge base if there are more than one candidates.
+LF='
+'
+common=$(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-index --refresh 2>/dev/null
+git-read-tree -u -m $common $head $merge || exit 1
+result_tree=$(git-write-tree  2> /dev/null)
+if [ $? -ne 0 ]; then
+       echo "Simple merge failed, trying Automatic merge"
+       git-merge-index -o git-merge-one-file -a
+       if [ $? -ne 0 ]; then
+               echo $merge > "$GIT_DIR"/MERGE_HEAD
+               die "Automatic merge failed, fix up by hand"
+       fi
+       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 $head $result_commit | git-apply --stat
+dropheads