[PATCH] More descriptive messages for conflict cases in merges

The merge strategies can give more descriptive error messages for
conflict cases if they are given the actual branch names instead of
the SHA1s.

Signed-off-by: Fredrik Kuivinen <freku045@student.liu.se>
Signed-off-by: Junio C Hamano <junkio@cox.net>

git-merge.sh

@@ -71,6 +71,7 @@ test "$#" -le 2 && usage ;# we need at least two heads.
 
 merge_msg="$1"
 shift
+head_arg="$1"
 head=$(git-rev-parse --verify "$1"^0) || usage
 shift
 
@@ -86,7 +87,7 @@ echo "$head" >"$GIT_DIR/ORIG_HEAD"
 
 case "$#,$common" in
 *,'')
-	die "Unable to find common commit between $head and $*"
+	die "Unable to find common commit between $head_arg and $*"
 	;;
 1,"$1")
 	# If head can reach all the merge then we are up to date.
@@ -147,7 +148,7 @@ do
     }
     echo "Trying merge strategy $strategy..."
     wt_strategy=$strategy
-    git-merge-$strategy $common -- $head "$@" || {
+    git-merge-$strategy $common -- $head_arg "$@" || {
 
 	# The backend exits with 1 when conflicts are left to be resolved,
 	# with 2 when it does not handle the given merge at all.
@@ -202,7 +203,7 @@ case "$best_strategy" in
 	echo "Rewinding the tree to pristine..."
 	git reset --hard $head
 	echo "Using the $best_strategy to prepare resolving by hand."
-	git-merge-$best_strategy $common -- $head "$@"
+	git-merge-$best_strategy $common -- $head_arg "$@"
 	;;
 esac
 for remote