Re: [PATCH] config: fix several access(NULL) calls

[Matthieu Moy <Matthieu.Moy@grenoble-inp.fr>]

Junio C Hamano <gitster@pobox.com> writes:

> I would think that it is plausible that the user wanted to write
> into XDG one and used "unset HOME" as a way to signal that wish. 

I didn't think of this case, but it makes sense.

Anyway, I don't really care either way, so I leave it up to you (either
your patch below, or the fixup in pu).

> -		if (user_config && access(user_config, R_OK) &&
> +		if (!user_config)
> +			/*
> +			 * We do not know HOME/.gitconfig exists or
> +			 * not, hence we do not know if we should
> +			 * write to XDG location, so we error out even
> +			 * if XDG_CONFIG_HOME is set and points at a
> +			 * sane location.
> +			 *
> +			 * In other words, we forbid the user from
> +			 * telling us to write to XDG location,
> +			 * pretending that $HOME/.gitconfig does not
> +			 * exist, by temporarily unsetting HOME.
> +			 */
> +			die("$HOME not set");
> +
> +		if (access(user_config, R_OK) &&
>  		    xdg_config && !access(xdg_config, R_OK))
>  			given_config_file = xdg_config;
> -		else if (user_config)
> -			given_config_file = user_config;
>  		else
> -			die("$HOME not set");
> +			given_config_file = user_config;

-- 
Matthieu Moy
http://www-verimag.imag.fr/~moy/