+static int process_tag(unsigned char *sha1)
+{
+ struct tag *obj = lookup_tag(sha1);
+
+ if (parse_tag(obj))
+ return -1;
+ return process_unknown(obj->tagged->sha1);
+}
+
+static int process_unknown(unsigned char *sha1)
+{
+ struct object *obj;
+ if (make_sure_we_have_it("object", sha1))
+ return -1;
+ obj = parse_object(sha1);
+ if (!obj)
+ return error("Unable to parse object %s", sha1_to_hex(sha1));
+ if (obj->type == commit_type)
+ return process_commit(sha1);
+ if (obj->type == tree_type)
+ return process_tree(sha1);
+ if (obj->type == blob_type)
+ return 0;
+ if (obj->type == tag_type)
+ return process_tag(sha1);
+ return error("Unable to determine requirement of type %s for %s",
+ obj->type, sha1_to_hex(sha1));
+}
+