[bug#42193] [WIP 2/6] services: Add 'kernel-profile-service-type'.

[pelzflorian (Florian Pelz)]

Thank you for your work!

After I apply this kernel profile patch, I get an error:

florian@florianmacbook ~/git/guix [env]$ ./pre-inst-env guix system disk-image 
--file-system-type=iso9660        gnu/system/install.scm
substitute: Liste der Substitute von „https://ci.guix.gnu.org“ wird 
aktualisiert … 100.0%
The following derivations will be built:
   /gnu/store/l51h17zylvjmapvcpdmmqmvrylv8b2cb-iso9660-image.drv
   /gnu/store/mhdkqnh4iri5rk1ayqd3xlw04q86zj29-grub.cfg.drv
   /gnu/store/xvgn60irpzzdwvk30lqpsj2hh81h8jyh-system.drv
   /gnu/store/6y2r0ab5jcflbajd6843v9g1j0v9xrzj-gc-roots.drv
   /gnu/store/156m13243bcn2429swq8brp2qmfifi3b-system.drv
building /gnu/store/156m13243bcn2429swq8brp2qmfifi3b-system.drv...
|builder for `/gnu/store/156m13243bcn2429swq8brp2qmfifi3b-system.drv' failed 
with exit code 1
build of /gnu/store/156m13243bcn2429swq8brp2qmfifi3b-system.drv failed
View build log at 
'/var/log/guix/drvs/15/6m13243bcn2429swq8brp2qmfifi3b-system.drv.bz2'.
cannot build derivation 
`/gnu/store/6y2r0ab5jcflbajd6843v9g1j0v9xrzj-gc-roots.drv': 1 dependencies 
couldn't be built
cannot build derivation 
`/gnu/store/xvgn60irpzzdwvk30lqpsj2hh81h8jyh-system.drv': 1 dependencies 
couldn't be built
cannot build derivation 
`/gnu/store/l51h17zylvjmapvcpdmmqmvrylv8b2cb-iso9660-image.drv': 1 dependencies 
couldn't be built
guix system: error: build of 
`/gnu/store/l51h17zylvjmapvcpdmmqmvrylv8b2cb-iso9660-image.drv' failed
florian@florianmacbook ~/git/guix [env]$ bzcat 
/var/log/guix/drvs/15/6m13243bcn2429swq8brp2qmfifi3b-system.drv.bz2
Backtrace:
           1 (primitive-load "/gnu/store/59nx7bbflcqzavwsjj3wkq3lwfb?")
           0 (symlink "/gnu/store/86xgvarqwir47c16x6crx0jra5dgzr62-?" ?)

ERROR: In procedure symlink:
In procedure symlink: File exists


I have no idea where this comes from but I hope you can reproduce the error.

In general, I would be happy to use the kernel module configuration
service for replacing the uvesafb-service-type by something like

 (simple-service 'uvesafb-module
             kernel-module-configuration-service-type
             (list (kernel-module
                    (name "uvesafb")
                    (options
                     (list #~(string-append "v86d=" #$v86d "/sbin/v86d")
                           "mode_option=1024x768\n"))))))))

Even better would be if it were possible to detect the resolution to
use for uvesafb at runtime before the module is loaded.  Is it
possible to execute as root at runtime before modprobe a script like
testvbe.scm attached to the first message from
<https://issues.guix.gnu.org/40538#0> to compute the mode_option to
use?

Regards,
Florian