bug#27261: guix package -u should warn about non-existent packages

[ludo@gnu.org (Ludovic Courtès)]

Hi Leo,

Leo Famulari <leo@famulari.name> skribis:

> On Mon, Jun 26, 2017 at 10:01:03AM +0200, Ludovic Courtès wrote:
>> Could you check whether “guix package -A syncthing” shows it there?  The
>> warning should appear as soon as we’re upgrading a package that’s
>> missing.
>
> I get no results when I do `./pre-inst-env guix package -A syncthing`
> from the repo where I removed qsyncthingtray.

So does “./pre-inst-env guix package -u syncthing” raise a warning?
It should.

> `guix package -A syncthing` shows a result for qsyncthingtray, because
> that is a "plain" Guix, from `guix pull`, set up as described in Binary
> Installation:
>
> $ ls -l $(which guix)
> lrwxrwxrwx 1 root staff 54 Aug 14  2015 /usr/local/bin/guix -> /var/guix/profiles/per-user/root/guix-profile/bin/guix
> $ ls -l ~/.config/guix/latest 
> lrwxrwxrwx 1 leo leo 55 Jun 25 19:19 /home/leo/.config/guix/latest -> /gnu/store/jbrn4pixmrqmqk8jmx533cnqhjhm17sb-guix-latest
>
> But, that's not the Guix that I expect to be queried for packages. Maybe
> there is some unexpected interaction between the various copies of Guix?

I don’t think so.  But maybe I’m missing something!

Ludo’.