Merge branch 'js/read-tree' into js/c-merge-recursive

* js/read-tree: (107 commits)
  read-tree: move merge functions to the library
  read-trees: refactor the unpack_trees() part
  tar-tree: illustrate an obscure feature better
  git.c: allow alias expansion without a git directory
  setup_git_directory_gently: do not barf when GIT_DIR is given.
  Build on Debian GNU/kFreeBSD
  Call setup_git_directory() much earlier
  Call setup_git_directory() early
  Display an error from update-ref if target ref name is invalid.
  Fix http-fetch
  t4103: fix binary patch application test.
  git-apply -R: binary patches are irreversible for now.
  Teach git-apply about '-R'
  Makefile: ssh-pull.o depends on ssh-fetch.c
  log and diff family: honor config even from subdirectories
  git-reset: detect update-ref error and report it.
  lost-found: use fsck-objects --full
  Teach git-http-fetch the --stdin switch
  Teach git-local-fetch the --stdin switch
  Make pull() support fetching multiple targets at once
  ...

git-merge.sh

@@ -63,7 +63,13 @@ squash_message () {
 }
 
 finish () {
-	test '' = "$2" || echo "$2"
+	if test '' = "$2"
+	then
+		rlogm="$rloga"
+	else
+		echo "$2"
+		rlogm="$rloga: $2"
+	fi
 	case "$squash" in
 	t)
 		echo "Squash commit -- not updating HEAD"
@@ -75,7 +81,7 @@ finish () {
 			echo "No merge message -- not updating HEAD"
 			;;
 		*)
-			git-update-ref HEAD "$1" "$head" || exit 1
+			git-update-ref -m "$rlogm" HEAD "$1" "$head" || exit 1
 			;;
 		esac
 		;;
@@ -93,6 +99,7 @@ finish () {
 	esac
 }
 
+rloga=
 while case "$#" in 0) break ;; esac
 do
 	case "$1" in
@@ -126,6 +133,9 @@ do
 			die "available strategies are: $all_strategies" ;;
 		esac
 		;;
+	--reflog-action=*)
+		rloga=`expr "z$1" : 'z-[^=]*=\(.*\)'`
+		;;
 	-*)	usage ;;
 	*)	break ;;
 	esac
@@ -140,6 +150,7 @@ shift
 
 # All the rest are remote heads
 test "$#" = 0 && usage ;# we need at least one remote head.
+test "$rloga" = '' && rloga="merge: $@"
 
 remoteheads=
 for remote
@@ -325,7 +336,7 @@ if test '' != "$result_tree"
 then
     parents=$(git-show-branch --independent "$head" "$@" | sed -e 's/^/-p /')
     result_commit=$(echo "$merge_msg" | git-commit-tree $result_tree $parents) || exit
-    finish "$result_commit" "Merge $result_commit, made by $wt_strategy."
+    finish "$result_commit" "Merge made by $wt_strategy."
     dropsave
     exit 0
 fi