From mboxrd@z Thu Jan  1 00:00:00 1970
From: brettg@posteo.net
Subject: Re: System-level inferiors.
Date: Wed, 20 Nov 2019 02:29:51 +0100
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On 19.11.2019 21:02, brettg@posteo.net wrote:
> Hey all,
> 
> I am experimenting with the inferior system a little bit. I am
> attempting to see if I can specify a specific version of the
> linux-libre kernel to be taken from an inferior and applied to my
> system configuration.
> 
> (define kernel-channel-inf
>   ;; This is the old revision from which
>   ;; we will obtain our desired kernel version.
>   (list (channel
>  (name 'guix)
>  (url "https://git.savannah.gnu.org/git/guix.git")
>  (commit
>           "fd41243c819635795f4e4bdef1e2823db5234e24"))))
> 
> (define kernel-inferior-proc
>   ;; An inferior representing `kernel-channel-inf'.
>   (inferior-for-channels kernel-channel-inf))
> 
> (operating-system
> 
>   ...
> 
>  (kernel (lookup-inferior-packages
>   kernel-inferior-proc "linux-libre" "4.19.81"))
> 
> It took me some experimenting to come up with this, in that
> experimenting the channel revision was built and cached. However, when
> I run `guix system build config.scm` with the above code snippet, the
> process just hangs on
> 
> Updating channel 'guix' from Git repository at
> 'https://git.savannah.gnu.org/git/guix.git'...
> 
> I am not sure how to proceed to achieve what I am hoping for. Any 
> thoughts?
> 
> Brett Gilio

Update, I used guix time-machine to ensure that this specific build of 
linux-libre 4.19.81 was available in the store, so now it is not 
hanging:

Instead, it is telling me:

guix/gexp.scm:201:36: In procedure lookup-compiler:
In procedure struct_vtable: Wrong type argument in position 1 (expecting 
struct): (#<inferior-package linux-libre@4.19.81 7f13870f8900>)

Will keep investigating a way to do this.

Brett Gilio