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From: zimoun <zimon.toutoune@gmail.com>
Subject: Re: guix gc doesn't seem to clean old guix revision
Date: Mon, 2 Dec 2019 22:51:32 +0100
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To: YOANN P <yoann_mac_donald@hotmail.com>
Cc: "guix-devel@gnu.org" <guix-devel@gnu.org>

Hi,

On Mon, 2 Dec 2019 at 21:55, YOANN P <yoann_mac_donald@hotmail.com> wrote:

> > I do not understand: running without any $USER is kind of very special
> > edge case.
>
> It is not special at all, $USER is only set when using a login shell.
> So if you script some guix commands (who doesn't use a login shell),
> it broke as it broke with my tests.

You have right about $USER. But it is not so common because the case
has not been encountered too much already. ;-)


> There is a user, this is just that the shell used is not a login shell.
> Since $USER/$HOME are only set when using a login shell, it is
> better to use `whoami` in place of $USER and expand ~$(whoami)
> in place of $HOME in scripts to be sure to have the right values even
> when using a non-login shell or to avoid errors if $USER was override.

You are proposing to avoid the call to '(or (getenv "USER") (getenv
"LOGNAME"))' in guix/profiles.scm and guix/store.scm and instead to
rely on the command "whoami" from the coreutils package, right?
Other said, instead of falling in the "default" case in
%profile-directory, call the whoami command, right?

Is whoami exposed in Guile?


Thank you for the explanations.

All the best,
simon