From mboxrd@z Thu Jan  1 00:00:00 1970
From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@gnu.org>
Subject: Re: adding environment variables to /etc/config.scm
Date: Tue, 03 Sep 2019 11:27:00 +0200
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References: <BWPSNJ6MHIFT.228L0UQZGVWRS@suika>
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In-Reply-To: <BWPSNJ6MHIFT.228L0UQZGVWRS@suika> (Jonathan Lane's message of
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To: Jonathan Lane <jon@dorsal.tk>
Cc: help-guix@gnu.org

Hello Jonathan,

"Jonathan Lane" <jon@dorsal.tk> skribis:

> I have a laptop with Intel graphics and I need to set the environment
> variable "COGL_ATLAS_DEFAULT_BLIT_MODE=3Dframebuffer" to fix GPU=20
> corruption issues as described here:
>
> https://wiki.archlinux.org/index.php/Intel_graphics#Troubleshooting
> https://bugs.freedesktop.org/show_bug.cgi?id=3D88584
>
> Unfortunately, it's supposed to go in /etc/environment, and that file
> gets clobbered every time I reboot or run `guix system reconfigure`.

Indeed, on Guix System one is not supposed to modify config files in
place.

Instead, you declare every aspect of your system config in your
=E2=80=98operating-system=E2=80=99 declaration, and then run =E2=80=98recon=
figure=E2=80=99 so that it=E2=80=99s
in effect.

To add environment variables to /etc/environment, you would =E2=80=9Cextend=
=E2=80=9D
=E2=80=98session-environment-service-type=E2=80=99, like so:

  (simple-service 'cogl-variable session-environment-service-type
                  '(("COGL_ATLAS_DEFAULT_BLIT_MODE" . "framebuffer")))

The expression above provides a service that you can add to the list in
the =E2=80=98services=E2=80=99 field of your =E2=80=98operating-system=E2=
=80=99 declaration.

HTH!

Ludo=E2=80=99.