From: Jake Shilling <shilling.jake@gmail.com>
To: Julien Lepiller <julien@lepiller.eu>, jgart <jgart@dismail.de>
Cc: Guix Devel <guix-devel@gnu.org>
Subject: Re: foreign-distro?
Date: Sun, 20 Nov 2022 20:57:30 -0500 [thread overview]
Message-ID: <87o7t19iid.fsf@gmail.com> (raw)
In-Reply-To: <20221120230833.1220f1d8@sybil.lepiller.eu>
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I've experimented with the distinction in my config, because I wanted to
be able to add home-services conditionally (e.g. I wanted my GuixSD to
install a destop envrionment, but my work laptop to only setup emacs and
its dependencies).
My approache was to just parse the `/etc/os-release` file if it exists:
```
(define (os-release)
(guard (_
(else #f))
(call-with-input-file "/etc/os-release"
(lambda (port)
(let loop ((line (read-line port))
(result '()))
(if (eof-object? line)
(reverse result)
(begin
(let* ((split (string-split line #\=))
(key (string->symbol (car split)))
(val (if (string-match "\".*\"" (cadr split))
(substring (cadr split) 1 (- (string-length (cadr split)) 1))
(string->symbol (cadr split))))
(d (cons key val)))
(loop (read-line port)
(cons d result))))))))))
```
Then I define a couple wrappers:
```
(define (linux-distro-id)
(if (linux?)
(assq-ref (os-release) 'ID)
#f))
(define (guix-system?)
(eq? (linux-distro-id) 'guix))
```
The config was never really fleshed out because I ended up just using my
GuixSD computer for work instead.
On 2022-11-20 23:08, Julien Lepiller wrote:
> Le Sun, 20 Nov 2022 14:54:40 -0600,
> jgart <jgart@dismail.de> a écrit :
>
>> Does Guix have a declarative Guix API way of knowing if it is
>> installing a package into foreign distro versus Guix System?
>>
>> I'm thinking of a function like `foreign-distro?`:
>>
>> ```
>> (define-public peek
>> (package
>> (name "peek")
>> ...
>> (inputs
>> `(,@(if (foreign-distro?) `(("ffmpeg" ,ffmpeg)) '())))
>> ```
>>
>> The above includes ffmpeg in the inputs only if installing peek on a
>> foreign distro. It could additionally patch the ffmpeg executable in
>> a peek package phases if foreign-distro? returns #t.
>>
>> WDYT
>>
>
>
> Guix doesn't have a notion of foreign distro, it's all in your head,
> and there's no difference between Guix System and other distros in the
> Guix package manager's point of view :)
>
> To be more specific, Guix only knows what you current system is (that's
> captured by %current-system). It's probably x86_64-linux right know. As
> you can see, there's no place in there to tell it whether you're on a
> foreign distro or not.
>
> Lastly, I don't think I would want to differentiate the two cases,
> especially since it would mean that somehow Guix packages depend on
> something external. There's this idea that Guix packages should somehow
> be self-sufficient.
>
--
Best regards,
Jake Shilling
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next prev parent reply other threads:[~2022-11-21 15:57 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-20 20:54 foreign-distro? jgart
2022-11-20 22:08 ` foreign-distro? Julien Lepiller
2022-11-21 1:57 ` Jake Shilling [this message]
2022-11-23 10:36 ` foreign-distro? Zhu Zihao
2022-11-23 12:34 ` foreign-distro? Wojtek Kosior via Development of GNU Guix and the GNU System distribution.
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