read_packed_refs(): do more of the work of reading packed refs
Teach `read_packed_refs()` to also
* Allocate and initialize the new `packed_ref_cache`
* Open and close the `packed-refs` file
* Update the `validity` field of the new object
This decreases the coupling between `packed_refs_cache` and
`files_ref_store` by a little bit.
Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/refs/ref-cache.h b/refs/ref-cache.h
index 1f65e2f..fbfee7c 100644
--- a/refs/ref-cache.h
+++ b/refs/ref-cache.h
@@ -194,7 +194,8 @@ struct ref_entry *create_ref_entry(const char *refname,
* function called to fill in incomplete directories in the
* `ref_cache` when they are accessed. If it is NULL, then the whole
* `ref_cache` must be filled (including clearing its directories'
- * `REF_INCOMPLETE` bits) before it is used.
+ * `REF_INCOMPLETE` bits) before it is used, and `refs` can be NULL,
+ * too.
*/
struct ref_cache *create_ref_cache(struct ref_store *refs,
fill_ref_dir_fn *fill_ref_dir);
