Merge branch 'mh/ref-clone-without-extra-refs'

* mh/ref-clone-without-extra-refs:
  write_remote_refs(): create packed (rather than extra) refs
  add_packed_ref(): new function in the refs API.
  ref_array: keep track of whether references are sorted
  pack_refs(): remove redundant check

diff --cc builtin/clone.c
index 9dcc5fe775dc8dd38bb905869ee87a9dc685dfcf,9413537a8e0f67b5d2e21cf133088f470cb26cb3..9084febb1428a4232b43d97912c7e3e7dfb9e382
--- 1/builtin/clone.c
--- 2/builtin/clone.c
+++ b/builtin/clone.c
@@@ -468,24 -445,8 +468,23 @@@ static void write_remote_refs(const str
        }
  
        pack_refs(PACK_REFS_ALL);
-       clear_extra_refs();
  }
  
 +static void write_followtags(const struct ref *refs, const char *msg)
 +{
 +      const struct ref *ref;
 +      for (ref = refs; ref; ref = ref->next) {
 +              if (prefixcmp(ref->name, "refs/tags/"))
 +                      continue;
 +              if (!suffixcmp(ref->name, "^{}"))
 +                      continue;
 +              if (!has_sha1_file(ref->old_sha1))
 +                      continue;
 +              update_ref(msg, ref->name, ref->old_sha1,
 +                         NULL, 0, DIE_ON_ERR);
 +      }
 +}
 +
  static int write_one_config(const char *key, const char *value, void *data)
  {
        return git_config_set_multivar(key, value ? value : "true", "^$", 0);