builtin-prune: protect objects listed on the command line

Finally, this resurrects the documented behaviour to protect other
objects listed on the command line from getting pruned.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 13 insertions, 2 deletions

diff --git a/builtin-prune.c b/builtin-prune.c
index 71caac578..25f9304b8 100644
--- a/builtin-prune.c
+++ b/builtin-prune.c
@@ -140,8 +140,19 @@ int cmd_prune(int argc, const char **argv, const char *prefix)
 	init_revisions(&revs, prefix);
 
 	argc = parse_options(argc, argv, options, prune_usage, 0);
-	if (argc)
-		die ("unrecognized argument: %s", name);
+	while (argc--) {
+		unsigned char sha1[20];
+		const char *name = *argv++;
+
+		if (!get_sha1(name, sha1)) {
+			struct object *object = parse_object(sha1);
+			if (!object)
+				die("bad object: %s", name);
+			add_pending_object(&revs, object, "");
+		}
+		else
+			die("unrecognized argument: %s", name);
+	}
 	mark_reachable_objects(&revs, 1);
 	prune_object_dir(get_object_directory());