From mboxrd@z Thu Jan  1 00:00:00 1970
From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@gnu.org>
Subject: Re: Audio/sound (ALSA) in guix environment --container
Date: Tue, 26 Mar 2019 18:15:00 +0100
Message-ID: <878sx1h817.fsf@gnu.org>
References: <874l7wgg75.fsf@bababa.i-did-not-set--mail-host-address--so-tickle-me>
Mime-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable
Return-path: <guix-devel-bounces+gcggd-guix-devel=m.gmane.org@gnu.org>
Received: from eggs.gnu.org ([209.51.188.92]:43258)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <ludo@gnu.org>) id 1h8pfL-0003PA-Sm
	for guix-devel@gnu.org; Tue, 26 Mar 2019 13:15:12 -0400
In-Reply-To: <874l7wgg75.fsf@bababa.i-did-not-set--mail-host-address--so-tickle-me>
	(Pierre Neidhardt's message of "Thu, 21 Mar 2019 20:50:22 +0100")
List-Id: "Development of GNU Guix and the GNU System distribution."
	<guix-devel.gnu.org>
List-Unsubscribe: <https://lists.gnu.org/mailman/options/guix-devel>,
	<mailto:guix-devel-request@gnu.org?subject=unsubscribe>
List-Archive: <http://lists.gnu.org/archive/html/guix-devel/>
List-Post: <mailto:guix-devel@gnu.org>
List-Help: <mailto:guix-devel-request@gnu.org?subject=help>
List-Subscribe: <https://lists.gnu.org/mailman/listinfo/guix-devel>,
	<mailto:guix-devel-request@gnu.org?subject=subscribe>
Errors-To: guix-devel-bounces+gcggd-guix-devel=m.gmane.org@gnu.org
Sender: "Guix-devel" <guix-devel-bounces+gcggd-guix-devel=m.gmane.org@gnu.org>
To: Pierre Neidhardt <mail@ambrevar.xyz>
Cc: Guix-devel <guix-devel@gnu.org>

Hello!

Pierre Neidhardt <mail@ambrevar.xyz> skribis:

> I'm trying to run an graphical application with audio in a Guix
> environment.
>
> So far:
>
> guix environment --container \
>   --share=3D/tmp/.X11-unix/ \
>   --share=3D/dev/snd \
>   --ad-hoc foo coreutils -- \
>   env DISPLAY=3D$DISPLAY foo "$@"
>
>
> I get this error:
>
> ALSA lib pcm_direct.c:1943:(snd1_pcm_direct_parse_open_conf) The field ip=
c_gid must be a valid group (create group audio)
>
>
> I though --share=3D/dev/snd would help, but I don't think that's useful.
> I tried creating the "audio" group in the container or adding the user
> to the group, to no avail:
>
>> guix environment -C --ad-hoc coreutils shadow=20
> ambrevar@bababa . [env]# groups
> groups: cannot find name for group ID 0
> 0 groups: cannot find name for group ID 65534
> 65534

Commit 952afb6f8c209692e52f9561965ee39e143e1d88 changes =E2=80=98guix
environment=E2=80=99 so that it creates /etc/group, using the brand new (gnu
build accounts) module.

Now =E2=80=98id=E2=80=99 and =E2=80=98groups=E2=80=99 work fine in containe=
rs.

Does it solve the specific problem you were having?  Maybe there are
other things that would need to be done, dunno.

I=E2=80=99m thinking we should change =E2=80=98guix environment -C=E2=80=99=
 to map to a UID
other than zero, at least by default.  When developing code, some tools
may behave differently when running under UID 0 and that=E2=80=99s rarely w=
hat
we need I think.  Thoughts?

Ludo=E2=80=99.