Function files_optimize

refs/files-backend.c:1458–1524

}

static int files_optimize(struct ref_store *ref_store,
			  struct refs_optimize_opts *opts)
{
	struct files_ref_store *refs =
		files_downcast(ref_store, REF_STORE_WRITE | REF_STORE_ODB,
			       "pack_refs");
	struct ref_iterator *iter;
	int ok;
	struct ref_to_prune *refs_to_prune = NULL;
	struct strbuf err = STRBUF_INIT;
	struct ref_transaction *transaction;

	if (!should_pack_refs(refs, opts))
		return 0;

	transaction = ref_store_transaction_begin(refs->packed_ref_store,
						  0, &err);
	if (!transaction)
		return -1;

	packed_refs_lock(refs->packed_ref_store, LOCK_DIE_ON_ERROR, &err);

	iter = cache_ref_iterator_begin(get_loose_ref_cache(refs, 0), NULL,
					refs->base.repo, 0);
	while ((ok = ref_iterator_advance(iter)) == ITER_OK) {
		/*
		 * If the loose reference can be packed, add an entry
		 * in the packed ref cache. If the reference should be
		 * pruned, also add it to refs_to_prune.
		 */
		if (!should_pack_ref(refs, &iter->ref, opts))
			continue;

		/*
		 * Add a reference creation for this reference to the
		 * packed-refs transaction:
		 */
		if (ref_transaction_update(transaction, iter->ref.name,
					   iter->ref.oid, NULL, NULL, NULL,
					   REF_NO_DEREF, NULL, &err))
			die("failure preparing to create packed reference %s: %s",
			    iter->ref.name, err.buf);

		/* Schedule the loose reference for pruning if requested. */
		if ((opts->flags & REFS_OPTIMIZE_PRUNE)) {
			struct ref_to_prune *n;
			FLEX_ALLOC_STR(n, name, iter->ref.name);
			oidcpy(&n->oid, iter->ref.oid);
			n->next = refs_to_prune;
			refs_to_prune = n;
		}
	}
	if (ok != ITER_DONE)
		die("error while iterating over references");

	if (ref_transaction_commit(transaction, &err))
		die("unable to write new packed-refs: %s", err.buf);