return 0;
        }
 
+       if (argc > 2 && !strcmp(argv[1], "--resolve-git-dir")) {
+               const char *gitdir = resolve_gitdir(argv[2]);
+               if (!gitdir)
+                       die("not a gitdir '%s'", argv[2]);
+               puts(gitdir);
+               return 0;
+       }
+
        if (argc > 1 && !strcmp("-h", argv[1]))
                usage(builtin_rev_parse_usage);
 
                        if (!strcmp(arg, "--show-prefix")) {
                                if (prefix)
                                        puts(prefix);
+                               else
+                                       putchar('\n');
                                continue;
                        }
                        if (!strcmp(arg, "--show-cdup")) {