repack: call prune_packed_objects() and update_server_info() directly

Call the functions behind git prune-packed and git update-server-info
directly instead of using run_command().  This is shorter, easier and
quicker.

Signed-off-by: Rene Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/repack.c

@@ -378,6 +378,7 @@ int cmd_repack(int argc, const char **argv, const char *prefix)
 	/* End of pack replacement. */
 
 	if (delete_redundant) {
+		int opts = 0;
 		sort_string_list(&names);
 		for_each_string_list_item(item, &existing_packs) {
 			char *sha1;
@@ -388,25 +389,13 @@ int cmd_repack(int argc, const char **argv, const char *prefix)
 			if (!string_list_has_string(&names, sha1))
 				remove_redundant_pack(packdir, item->string);
 		}
-		argv_array_push(&cmd_args, "prune-packed");
-		if (quiet)
-			argv_array_push(&cmd_args, "--quiet");
-
-		memset(&cmd, 0, sizeof(cmd));
-		cmd.argv = cmd_args.argv;
-		cmd.git_cmd = 1;
-		run_command(&cmd);
-		argv_array_clear(&cmd_args);
+		if (!quiet && isatty(2))
+			opts |= PRUNE_PACKED_VERBOSE;
+		prune_packed_objects(opts);
 	}
 
-	if (!no_update_server_info) {
-		argv_array_push(&cmd_args, "update-server-info");
-		memset(&cmd, 0, sizeof(cmd));
-		cmd.argv = cmd_args.argv;
-		cmd.git_cmd = 1;
-		run_command(&cmd);
-		argv_array_clear(&cmd_args);
-	}
+	if (!no_update_server_info)
+		update_server_info(0);
 	remove_temporary_files();
 	string_list_clear(&names, 0);
 	string_list_clear(&rollback, 0);