Re: [RFC/PATCH 2/9] ref-filter: implement '--points-at' option

> +/*
> + * Given a ref (sha1, refname) see if it points to a one of the sha1s
> + * in a sha1_array.
> + */
> +static int match_points_at(struct sha1_array *points_at, const unsigned char *sha1,
> +			   const char *refname)
> +{
> +	struct object *obj;
> +
> +	if (!points_at || !points_at->nr)
> +		return 1;
> +
> +	if (sha1_array_lookup(points_at, sha1) >= 0)
> +		return 1;
> +
> +	obj = parse_object_or_die(sha1, refname);
> +	if (obj->type == OBJ_TAG &&
> +	    sha1_array_lookup(points_at, ((struct tag *)obj)->tagged->sha1) >= 0)
> +		return 1;
> +
> +	return 0;
> +}