+int head_ref(int (*fn)(const char *path, const unsigned char *sha1))
+{
+ unsigned char sha1[20];
+ const char *headpath = git_path("HEAD");
+ if (!read_ref(headpath, sha1))
+ return fn(headpath, sha1);
+ return 0;
+}
+
+int for_each_ref(int (*fn)(const char *path, const unsigned char *sha1))