+ if (!strcmp(arg, "-n") || !strcmp(arg, "--no-create")) {
+ state.not_new = 1;
+ continue;
+ }
+ if (!strcmp(arg, "-u") || !strcmp(arg, "--index")) {
+ state.refresh_cache = 1;
+ if (newfd < 0)
+ newfd = hold_index_file_for_update
+ (&cache_file,
+ get_index_file());
+ if (newfd < 0)
+ die("cannot open index.lock file.");
+ continue;
+ }
+ if (!memcmp(arg, "--prefix=", 9)) {
+ state.base_dir = arg+9;
+ state.base_dir_len = strlen(state.base_dir);
+ continue;
+ }
+ if (arg[0] == '-')
+ usage(checkout_cache_usage);
+ break;
+ }
+
+ if (state.base_dir_len) {
+ /* when --prefix is specified we do not
+ * want to update cache.
+ */
+ if (state.refresh_cache) {
+ close(newfd); newfd = -1;
+ rollback_index_file(&cache_file);
+ }
+ state.refresh_cache = 0;
+ }
+
+ /* Check out named files first */
+ for ( ; i < argc; i++) {
+ const char *arg = argv[i];
+
+ if (all)
+ die("git-checkout-index: don't mix '--all' and explicit filenames");