Function prepare_bitmap_walk

pack-bitmap.c:2103–2257

}

struct bitmap_index *prepare_bitmap_walk(struct rev_info *revs,
					 int filter_provided_objects)
{
	unsigned int i;
	int use_boundary_traversal;

	struct object_list *wants = NULL;
	struct object_list *haves = NULL;

	struct bitmap *wants_bitmap = NULL;
	struct bitmap *haves_bitmap = NULL;

	struct bitmap_index *bitmap_git;
	struct repository *repo;

	/*
	 * We can't do pathspec limiting with bitmaps, because we don't know
	 * which commits are associated with which object changes (let alone
	 * even which objects are associated with which paths).
	 */
	if (revs->prune)
		return NULL;

	if (!can_filter_bitmap(&revs->filter))
		return NULL;

	/* try to open a bitmapped pack, but don't parse it yet
	 * because we may not need to use it */
	CALLOC_ARRAY(bitmap_git, 1);
	if (open_bitmap(revs->repo, bitmap_git) < 0)
		goto cleanup;

	for (i = 0; i < revs->pending.nr; ++i) {
		struct object *object = revs->pending.objects[i].item;

		if (object->type == OBJ_NONE)
			parse_object_or_die(revs->repo, &object->oid, NULL);

		while (object->type == OBJ_TAG) {
			struct tag *tag = (struct tag *) object;

			if (object->flags & UNINTERESTING)
				object_list_insert(object, &haves);
			else
				object_list_insert(object, &wants);

			object = parse_object_or_die(revs->repo, get_tagged_oid(tag), NULL);
			object->flags |= (tag->object.flags & UNINTERESTING);
		}

		if (object->flags & UNINTERESTING)
			object_list_insert(object, &haves);
		else
			object_list_insert(object, &wants);
	}

	use_boundary_traversal = git_env_bool(GIT_TEST_PACK_USE_BITMAP_BOUNDARY_TRAVERSAL, -1);
	if (use_boundary_traversal < 0) {