Re: [PATCHv4 8/8] clone: recursive and reference option triggers submodule alternates

> +int add_possible_reference_from_superproject(
> +		struct alternate_object_database *alt, void *sas_cb)
> +{
> +	struct submodule_alternate_setup *sas = sas_cb;
> +
> + ...
> +	size_t namelen = alt->name - alt->base - 1;
> +	struct strbuf name = STRBUF_INIT;
> +	strbuf_add(&name, alt->base, namelen);
> +
> +	/*
> +	 * If the alternate object store is another repository, try the
> +	 * standard layout with .git/modules/<name>/objects
> +	 */
> +	if (ends_with(name.buf, ".git/objects")) {
> +		char *sm_alternate;
> +		struct strbuf sb = STRBUF_INIT;
> +		struct strbuf err = STRBUF_INIT;
> +		strbuf_add(&sb, name.buf, name.len - strlen("objects"));
> +		/*
> +		 * We need to end the new path with '/' to mark it as a dir,
> +		 * otherwise a submodule name containing '/' will be broken
> +		 * as the last part of a missing submodule reference would
> +		 * be taken as a file name.
> +		 */
> +		strbuf_addf(&sb, "modules/%s/", sas->submodule_name);
> +
> +		sm_alternate = compute_alternate_path(sb.buf, &err);