- const char *head_points_at = resolve_ref("HEAD", sha1, 1, &flag);
-
- if (!head_points_at || !(flag & REF_ISSYMREF))
- return error("HEAD is not a symbolic ref");
- if (prefixcmp(head_points_at, "refs/heads/"))
+ int null_is_error = 0;
+ const char *head_points_at = resolve_ref("HEAD", sha1, 0, &flag);
+
+ if (!head_points_at)
+ return error("Invalid HEAD");
+ if (!strcmp(head_points_at, "HEAD"))
+ /* detached HEAD */
+ null_is_error = 1;
+ else if (prefixcmp(head_points_at, "refs/heads/"))