refs: centralize initialization of the base ref_store.

Signed-off-by: Han-Wen Nienhuys <hanwen@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/refs.c b/refs.c
index 4c31795..f91edb7 100644
--- a/refs.c
+++ b/refs.c
@@ -2007,10 +2007,12 @@ struct ref_store *get_worktree_ref_store(const struct worktree *wt)
 	return refs;
 }
 
-void base_ref_store_init(struct ref_store *refs,
-			 const struct ref_storage_be *be)
+void base_ref_store_init(struct ref_store *refs, struct repository *repo,
+			 const char *path, const struct ref_storage_be *be)
 {
 	refs->be = be;
+	refs->repo = repo;
+	refs->gitdir = xstrdup(path);
 }
 
 /* backend functions */