Merge branch 'db/learn-HEAD'

* db/learn-HEAD:
  Make ls-remote http://... list HEAD, like for git://...
  Make walker.fetch_ref() take a struct ref.

remote.h

@@ -63,6 +63,8 @@ int check_ref_type(const struct ref *ref, int flags);
  */
 void free_refs(struct ref *ref);
 
+int resolve_remote_symref(struct ref *ref, struct ref *list);
+
 /*
  * Removes and frees any duplicate refs in the map.
  */