Re: [PATCH v6 3/6] refs: receive and use the reference storage payload

> diff --git a/refs.c b/refs.c
> index 77b93d655b..11d028232b 100644
> --- a/refs.c
> +++ b/refs.c
> @@ -3425,3 +3426,40 @@ const char *ref_transaction_error_msg(enum ref_transaction_error err)
>  		return "unknown failure";
>  	}
>  }
> +
> +void refs_compute_filesystem_location(const char *gitdir, const char *payload,
> +				      bool *is_worktree, struct strbuf *refdir,
> +				      struct strbuf *ref_common_dir)
> +{
> +	struct strbuf sb = STRBUF_INIT;
> +
> +	*is_worktree = get_common_dir_noenv(ref_common_dir, gitdir);
> +
> +	if (!payload) {
> +		/*
> +		 * We can use the 'gitdir' as the 'refdir' without appending the
> +		 * worktree path, as the 'gitdir' here is already the worktree
> +		 * path and is different from 'commondir' denoted by 'ref_common_dir'.
> +		 */
> +		strbuf_addstr(refdir, gitdir);
> +		return;
> +	}
> +
> +	if (!is_absolute_path(payload)) {
> +		strbuf_addf(&sb, "%s/%s", ref_common_dir->buf, payload);
> +		strbuf_realpath(ref_common_dir, sb.buf, 1);
> +	} else {
> +		strbuf_realpath(ref_common_dir, payload, 1);
> +	}
> +
> +	strbuf_addbuf(refdir, ref_common_dir);
> +
> +	if (*is_worktree) {
> +		const char *wt_id = strrchr(gitdir, '/');
> +		if (!wt_id)
> +			BUG("worktree path does not contain slash ");