From mboxrd@z Thu Jan  1 00:00:00 1970
From: brettg@posteo.net
Subject: System-level inferiors.
Date: Tue, 19 Nov 2019 21:02:47 +0100
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To: help-guix <help-guix@gnu.org>

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