push: fix local refs update if already up-to-date

git push normally updates local refs only after a successful push. If the
remote already has the updates -- pushed indirectly through another repository,
for example -- we forget to update local tracking refs.

Signed-off-by: Clemens Buchacher <drizzd@aon.at>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin-send-pack.c

@@ -222,7 +222,7 @@ static void update_tracking_ref(struct remote *remote, struct ref *ref)
 {
 	struct refspec rs;
 
-	if (ref->status != REF_STATUS_OK)
+	if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 		return;
 
 	rs.src = ref->name;
@@ -424,24 +424,19 @@ static int do_send_pack(int in, int out, struct remote *remote, const char *dest
 	 */
 	new_refs = 0;
 	for (ref = remote_refs; ref; ref = ref->next) {
-		const unsigned char *new_sha1;
-
-		if (!ref->peer_ref) {
-			if (!args.send_mirror)
-				continue;
-			new_sha1 = null_sha1;
-		}
-		else
-			new_sha1 = ref->peer_ref->new_sha1;
 
+		if (ref->peer_ref)
+			hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
+		else if (!args.send_mirror)
+			continue;
 
-		ref->deletion = is_null_sha1(new_sha1);
+		ref->deletion = is_null_sha1(ref->new_sha1);
 		if (ref->deletion && !allow_deleting_refs) {
 			ref->status = REF_STATUS_REJECT_NODELETE;
 			continue;
 		}
 		if (!ref->deletion &&
-		    !hashcmp(ref->old_sha1, new_sha1)) {
+		    !hashcmp(ref->old_sha1, ref->new_sha1)) {
 			ref->status = REF_STATUS_UPTODATE;
 			continue;
 		}
@@ -469,14 +464,13 @@ static int do_send_pack(int in, int out, struct remote *remote, const char *dest
 		    !ref->deletion &&
 		    !is_null_sha1(ref->old_sha1) &&
 		    (!has_sha1_file(ref->old_sha1)
-		      || !ref_newer(new_sha1, ref->old_sha1));
+		      || !ref_newer(ref->new_sha1, ref->old_sha1));
 
 		if (ref->nonfastforward && !ref->force && !args.force_update) {
 			ref->status = REF_STATUS_REJECT_NONFASTFORWARD;
 			continue;
 		}
 
-		hashcpy(ref->new_sha1, new_sha1);
 		if (!ref->deletion)
 			new_refs++;
 

t/t5516-fetch-push.sh

@@ -437,6 +437,37 @@ test_expect_success 'push updates local refs' '
 
 '
 
+test_expect_success 'push updates up-to-date local refs' '
+
+	rm -rf parent child &&
+	mkdir parent &&
+	(cd parent && git init &&
+		echo one >foo && git add foo && git commit -m one) &&
+	git clone parent child1 &&
+	git clone parent child2 &&
+	(cd child1 &&
+		echo two >foo && git commit -a -m two &&
+		git push) &&
+	(cd child2 &&
+		git pull ../child1 master &&
+		git push &&
+	test $(git rev-parse master) = $(git rev-parse remotes/origin/master))
+
+'
+
+test_expect_success 'push preserves up-to-date packed refs' '
+
+	rm -rf parent child &&
+	mkdir parent &&
+	(cd parent && git init &&
+		echo one >foo && git add foo && git commit -m one) &&
+	git clone parent child &&
+	(cd child &&
+		git push &&
+	! test -f .git/refs/remotes/origin/master)
+
+'
+
 test_expect_success 'push does not update local refs on failure' '
 
 	rm -rf parent child &&