packed-backend: rip out some now-unused code

Now the outside world interacts with the packed ref store only via the
generic refs API plus a few lock-related functions. This allows us to
delete some functions that are no longer used, thereby completing the
encapsulation of the packed ref store.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: mhagger

refs/packed-backend.c

@@ -91,19 +91,6 @@ struct ref_store *packed_ref_store_create(const char *path,
 	return ref_store;
 }
 
-/*
- * Die if refs is not the main ref store. caller is used in any
- * necessary error messages.
- */
-static void packed_assert_main_repository(struct packed_ref_store *refs,
-					  const char *caller)
-{
-	if (refs->store_flags & REF_STORE_MAIN)
-		return;
-
-	die("BUG: operation %s only allowed for main ref store", caller);
-}
-
 /*
  * Downcast `ref_store` to `packed_ref_store`. Die if `ref_store` is
  * not a `packed_ref_store`. Also die if `packed_ref_store` doesn't
@@ -321,40 +308,6 @@ static struct ref_dir *get_packed_refs(struct packed_ref_store *refs)
 	return get_packed_ref_dir(get_packed_ref_cache(refs));
 }
 
-/*
- * Add or overwrite a reference in the in-memory packed reference
- * cache. This may only be called while the packed-refs file is locked
- * (see packed_refs_lock()). To actually write the packed-refs file,
- * call commit_packed_refs().
- */
-void add_packed_ref(struct ref_store *ref_store,
-		    const char *refname, const struct object_id *oid)
-{
-	struct packed_ref_store *refs =
-		packed_downcast(ref_store, REF_STORE_WRITE,
-				"add_packed_ref");
-	struct ref_dir *packed_refs;
-	struct ref_entry *packed_entry;
-
-	if (!is_lock_file_locked(&refs->lock))
-		die("BUG: packed refs not locked");
-
-	if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL))
-		die("Reference has invalid format: '%s'", refname);
-
-	packed_refs = get_packed_refs(refs);
-	packed_entry = find_ref_entry(packed_refs, refname);
-	if (packed_entry) {
-		/* Overwrite the existing entry: */
-		oidcpy(&packed_entry->u.value.oid, oid);
-		packed_entry->flag = REF_ISPACKED;
-		oidclr(&packed_entry->u.value.peeled);
-	} else {
-		packed_entry = create_ref_entry(refname, oid, REF_ISPACKED);
-		add_ref_entry(packed_refs, packed_entry);
-	}
-}
-
 /*
  * Return the ref_entry for the given refname from the packed
  * references.  If it does not exist, return NULL.
@@ -596,152 +549,6 @@ int packed_refs_is_locked(struct ref_store *ref_store)
 static const char PACKED_REFS_HEADER[] =
 	"# pack-refs with: peeled fully-peeled \n";
 
-/*
- * Write the current version of the packed refs cache from memory to
- * disk. The packed-refs file must already be locked for writing (see
- * packed_refs_lock()). Return zero on success. On errors, rollback
- * the lockfile, write an error message to `err`, and return a nonzero
- * value.
- */
-int commit_packed_refs(struct ref_store *ref_store, struct strbuf *err)
-{
-	struct packed_ref_store *refs =
-		packed_downcast(ref_store, REF_STORE_WRITE | REF_STORE_MAIN,
-				"commit_packed_refs");
-	struct packed_ref_cache *packed_ref_cache =
-		get_packed_ref_cache(refs);
-	int ok;
-	int ret = -1;
-	struct strbuf sb = STRBUF_INIT;
-	FILE *out;
-	struct ref_iterator *iter;
-	char *packed_refs_path;
-
-	if (!is_lock_file_locked(&refs->lock))
-		die("BUG: commit_packed_refs() called when unlocked");
-
-	/*
-	 * If packed-refs is a symlink, we want to overwrite the
-	 * symlinked-to file, not the symlink itself. Also, put the
-	 * staging file next to it:
-	 */
-	packed_refs_path = get_locked_file_path(&refs->lock);
-	strbuf_addf(&sb, "%s.new", packed_refs_path);
-	if (create_tempfile(&refs->tempfile, sb.buf) < 0) {
-		strbuf_addf(err, "unable to create file %s: %s",
-			    sb.buf, strerror(errno));
-		strbuf_release(&sb);
-		goto out;
-	}
-	strbuf_release(&sb);
-
-	out = fdopen_tempfile(&refs->tempfile, "w");
-	if (!out) {
-		strbuf_addf(err, "unable to fdopen packed-refs tempfile: %s",
-			    strerror(errno));
-		goto error;
-	}
-
-	if (fprintf(out, "%s", PACKED_REFS_HEADER) < 0) {
-		strbuf_addf(err, "error writing to %s: %s",
-			    get_tempfile_path(&refs->tempfile), strerror(errno));
-		goto error;
-	}
-
-	iter = cache_ref_iterator_begin(packed_ref_cache->cache, NULL, 0);
-	while ((ok = ref_iterator_advance(iter)) == ITER_OK) {
-		struct object_id peeled;
-		int peel_error = ref_iterator_peel(iter, &peeled);
-
-		if (write_packed_entry(out, iter->refname, iter->oid->hash,
-				       peel_error ? NULL : peeled.hash)) {
-			strbuf_addf(err, "error writing to %s: %s",
-				    get_tempfile_path(&refs->tempfile),
-				    strerror(errno));
-			ref_iterator_abort(iter);
-			goto error;
-		}
-	}
-
-	if (ok != ITER_DONE) {
-		strbuf_addf(err, "unable to rewrite packed-refs file: "
-			    "error iterating over old contents");
-		goto error;
-	}
-
-	if (rename_tempfile(&refs->tempfile, packed_refs_path)) {
-		strbuf_addf(err, "error replacing %s: %s",
-			    refs->path, strerror(errno));
-		goto out;
-	}
-
-	ret = 0;
-	goto out;
-
-error:
-	delete_tempfile(&refs->tempfile);
-
-out:
-	free(packed_refs_path);
-	return ret;
-}
-
-/*
- * Rewrite the packed-refs file, omitting any refs listed in
- * 'refnames'. On error, leave packed-refs unchanged, write an error
- * message to 'err', and return a nonzero value. The packed refs lock
- * must be held when calling this function; it will still be held when
- * the function returns.
- *
- * The refs in 'refnames' needn't be sorted. `err` must not be NULL.
- */
-int repack_without_refs(struct ref_store *ref_store,
-			struct string_list *refnames, struct strbuf *err)
-{
-	struct packed_ref_store *refs =
-		packed_downcast(ref_store, REF_STORE_WRITE | REF_STORE_MAIN,
-				"repack_without_refs");
-	struct ref_dir *packed;
-	struct string_list_item *refname;
-	int needs_repacking = 0, removed = 0;
-
-	packed_assert_main_repository(refs, "repack_without_refs");
-	assert(err);
-
-	if (!is_lock_file_locked(&refs->lock))
-		die("BUG: repack_without_refs called without holding lock");
-
-	/* Look for a packed ref */
-	for_each_string_list_item(refname, refnames) {
-		if (get_packed_ref(refs, refname->string)) {
-			needs_repacking = 1;
-			break;
-		}
-	}
-
-	/* Avoid locking if we have nothing to do */
-	if (!needs_repacking)
-		return 0; /* no refname exists in packed refs */
-
-	packed = get_packed_refs(refs);
-
-	/* Remove refnames from the cache */
-	for_each_string_list_item(refname, refnames)
-		if (remove_entry_from_dir(packed, refname->string) != -1)
-			removed = 1;
-	if (!removed) {
-		/*
-		 * All packed entries disappeared while we were
-		 * acquiring the lock.
-		 */
-		clear_packed_ref_cache(refs);
-		return 0;
-	}
-
-	/* Write what remains */
-	return commit_packed_refs(&refs->base, err);
-}
-
 static int packed_init_db(struct ref_store *ref_store, struct strbuf *err)
 {
 	/* Nothing to do. */

refs/packed-backend.h

@@ -23,12 +23,4 @@ int packed_refs_lock(struct ref_store *ref_store, int flags, struct strbuf *err)
 void packed_refs_unlock(struct ref_store *ref_store);
 int packed_refs_is_locked(struct ref_store *ref_store);
 
-void add_packed_ref(struct ref_store *ref_store,
-		    const char *refname, const struct object_id *oid);
-
-int commit_packed_refs(struct ref_store *ref_store, struct strbuf *err);
-
-int repack_without_refs(struct ref_store *ref_store,
-			struct string_list *refnames, struct strbuf *err);
-
 #endif /* REFS_PACKED_BACKEND_H */