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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@gnu.org>
To: guix-devel@gnu.org
Subject: Re: The `channels' field of `operating-system' record
In-Reply-To: <Zh2kbjumlPD3oVqp@ws> (Tomas Volf's message of "Tue, 16 Apr 2024
 00:04:30 +0200")
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Hi,

Tomas Volf <~@wolfsden.cz> skribis:

> On 2024-04-10 17:17:27 +0200, Ludovic Court=C3=A8s wrote:

[...]

>> Yes, why is that?  At first sight, that=E2=80=99s because =E2=80=98extra=
-special-file=E2=80=99
>> does things at activation time; there=E2=80=99s no check happening at
>> configuration time.
>>
>> It was really meant for /bin/sh, /usr/bin/env, and similar.  The reason
>> its effect is silently dismissed in this case is, I think, because its
>> activation runs before the /etc activation.  So it=E2=80=99s really bad =
luck.
>>
>> I=E2=80=99m not sure what to do here, apart from maybe recommending agai=
nst
>> broad use of this service.
>
> I will re-phrase the above into a documentation patch.

Great.

>> That would be: (guix-configuration =E2=80=A6 (channels (load "channels.s=
cm"))).
>
> That does not seems to work, I am getting this error:
>
>     /tmp $ guix system build os.scm
>     ;;; compiling /tmp/channels.scm
>     ;;; /tmp/channels.scm:1:7: warning: possibly unbound variable `channe=
l'

[...]

> But after some experimentation (and looking into pull.scm), it seems what=
 I need
> is this:
>
>     (use-modules (guix ui))
>     (use-modules (guix channels))
>
> and
>
>     (channels (load* "channels.scm"
>                      (make-user-module '((guix channels)))))

Or simpler: use (guix channels) in your OS config so you can use
(load "channels.scm").

(=E2=80=98load=E2=80=99 evaluates code in the current module.)

> Maybe it would be best to extract (load-channels) from pull.scm into
> guix/channels.scm, exporting it?  (Since for example the above is missing=
 error
> checking code from (load-channels)).

Yes, good idea, we can do that.

Thanks for your feedback!

Ludo=E2=80=99.