refs: move to using the '.optimize' functions

The `struct ref_store` variable exposes two ways to optimize a reftable
backend:

  1. pack_refs
  2. optimize

The former was specific to the 'files' + 'packed' refs backend. The
latter is more generic and covers all backends. While the naming is
different, both of these functions perform the same functionality.

Consolidate this code to only maintain the 'optimize' functions. Do this
by modifying the backends so that they exclusively implement the
`optimize` callback, only. All users of the refs subsystem already use
the 'optimize' function so there is no changes needed on the callee
side. Finally, cleanup all references to the 'pack_refs' field of the
structure and code around it.

Signed-off-by: Karthik Nayak <karthik.188@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 0 insertions, 6 deletions

diff --git a/refs.h b/refs.h
index 2dd7ac1a16..8ff591ea95 100644
--- a/refs.h
+++ b/refs.h
@@ -515,12 +515,6 @@ struct pack_refs_opts {
 };
 
 /*
- * Write a packed-refs file for the current repository.
- * flags: Combination of the above PACK_REFS_* flags.
- */
-int refs_pack_refs(struct ref_store *refs, struct pack_refs_opts *opts);
-
-/*
  * Optimize the ref store. The exact behavior is up to the backend.
  * For the files backend, this is equivalent to packing refs.
  */