Re: [PATCH v3 29/33] refs: resolve symbolic refs first

> +	if (read_raw_ref(refname, lock->old_oid.hash, referent, type)) {
> +		if (errno == ENOENT) {
> +			if (mustexist) {
> +				/* Garden variety missing reference. */
> +				strbuf_addf(err, "unable to resolve reference '%s'",
> +					    refname);
> +				goto error_return;
> +			} else {
> +				/*
> +				 * Reference is missing, but that's OK. We
> +				 * know that there is not a conflict with
> +				 * another loose reference because
> +				 * (supposing that we are trying to lock
> +				 * reference "refs/foo/bar"):
> +				 *
> +				 * - We were successfully able to create
> +				 *   the lockfile refs/foo/bar.lock, so we
> +				 *   know there cannot be a loose reference
> +				 *   named "refs/foo".
> +				 *
> +				 * - We got ENOENT and not EISDIR, so we
> +				 *   know that there cannot be a loose
> +				 *   reference named "refs/foo/bar/baz".
> +				 */
> +			}