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bug#39643: (Out-of-tree) system kernel modules only found in :out

From: Marius Bakke
Subject: bug#39643: (Out-of-tree) system kernel modules only found in :out
Date: Tue, 18 Feb 2020 18:26:46 +0100
User-agent: Notmuch/0.29.3 (https://notmuchmail.org) Emacs/26.3 (x86_64-pc-linux-gnu)

Tobias Geerinckx-Rice via Bug reports for GNU Guix <address@hidden>

> Guix,
> After adding (specification->package+output "zfs:module") to my 
> system packages, it's still missing from current-system:
>   $ guix system reconfigure …
>   $ ls /run/current-system/profile/lib/modules/
>   5.4.0-pf7-4-ed26-M88
> That's my horrible custom Linux fork/version/abomination. 
> Apologies.  The ZFS package simply compiles against Guix's default 
> linux-libre-5.4.20-gnu package.

To build out-of-tree modules with a custom kernel I would expect that
you have to rebuild them against your kernel:

(define my-kernel

(define with-custom-kernel
 (package-input-rewriting `((,linux-libre . ,my-kernel))))

(define zfs-with-custom-kernel
 (with-custom-kernel zfs))

Alternatively, I see that 'linux-module-build-system' takes a #:linux

(define zfs-with-my-kernel
  (arguments (substitute-keyword-arguments (package-arguments zfs))
   ((#:linux _ #f) my-kernel))))

Will these options work for you, or am I misunderstanding something?

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