Subject: Re: [PATCH 1/2] submodule--helper, module_clone: always operate on absolute paths

From: Junio C Hamano <[email-masked]>
Date: Fri, 01 Apr 2016 12:18:23 -0700

Stefan Beller <[email-masked]> writes:

> +	char *sm_gitdir_rel, *p, *path = NULL;
> +	const char *sm_gitdir;
>  	struct strbuf rel_path = STRBUF_INIT;
>  	struct strbuf sb = STRBUF_INIT;
>  
> @@ -198,7 +199,14 @@ static int module_clone(int argc, const char **argv, const char *prefix)
>  		die(_("submodule--helper: unspecified or empty --path"));
>  
>  	strbuf_addf(&sb, "%s/modules/%s", get_git_dir(), name);
> -	sm_gitdir = strbuf_detach(&sb, NULL);
> +	sm_gitdir_rel = strbuf_detach(&sb, NULL);
> +	sm_gitdir = absolute_path(sm_gitdir_rel);

With this change, sm_gitdir will always be absolute, which means the
parameter to clone_submodule() call (immedately after this hunk)
will now be always absolute.  I do not think "git clone" called from
there will leave anything in the resulting repository that depends
on the --separate-git-dir=<dir> being relative or absolute, so this
change should not cause us new problems.

By the way, this line is the last use of sm_gitdir_rel before it
gets freed.  I wonder

	sm_gitdir = absolute_path(sb.buf);

would be sufficient.  We can lose the variable, and free() on it at
the end of this function, and an extra allocation if we can do so.

> +	if (!is_absolute_path(path)) {
> +		strbuf_addf(&sb, "%s/%s", get_git_work_tree(), path);
> +		path = strbuf_detach(&sb, 0);
> +	} else
> +		path = xstrdup(path);
>  
>  	if (!file_exists(sm_gitdir)) {
>  		if (safe_create_leading_directories_const(sm_gitdir) < 0)

Other than that, looks good to me.

Thanks.