Re: printer installed, now scanner ?

[Gottfried <gottfried@posteo.de>]

I found the printing documentation in the manual already, but I didn´t 
understand exactly what I have to do practically.
That´s why, I wrote this email.

I tried several times to configure /etc/config.scm according to your 
email, but it failed. I have problems to understand yet the manual
(It seems to me the manual is written for people who have already a 
degree in computers)

this is my config.scm file:
what do I have to add exactly and where?


;; This is an operating system configuration generated
;; by the graphical installer.

(use-modules (gnu))
(use-package-modules cups)
(use-service-modules cups desktop networking ssh xorg)

(operating-system
   (locale "de_DE.utf8")
   (timezone "Europe/Berlin")
   (keyboard-layout (keyboard-layout "de"))
   (host-name "Tuxedo")
   (users (cons* (user-account
                   (name "gfp")
                   (comment "Gfp")
                   (group "users")
                   (home-directory "/home/gfp")
                   (supplementary-groups
                     '("wheel" "netdev" "audio" "video")))
                 %base-user-accounts))
   (packages
     (append
       (list (specification->package "awesome")
             (specification->package "nss-certs"))			
       %base-packages))
   (services
     (append
       (list (service mate-desktop-service-type)
             (service enlightenment-desktop-service-type)
			(service cups-service-type
				(cups-configuration
					(web-interface? #t)
					(extensions (list cups-filters hplip))))			
			(service openssh-service-type)
             (service tor-service-type)
             (set-xorg-configuration
               (xorg-configuration
                 (keyboard-layout keyboard-layout))))
       %desktop-services))
		
   (bootloader
     (bootloader-configuration
       (bootloader grub-efi-bootloader)
       (target "/boot/efi")
       (keyboard-layout keyboard-layout)))
   (swap-devices
     (list (uuid "51d5cd20-4513-4a02-9e35-df4338eccaa0")))
   (file-systems
     (cons* (file-system
              (mount-point "/boot/efi")
              (device (uuid "BB77-FE3B" 'fat32))
              (type "vfat"))
            (file-system
              (mount-point "/")
              (device
                (uuid "4fb0ed7c-61ab-45eb-be0b-ff527b320e6d"
                      'ext4))
              (type "ext4"))
            %base-file-systems)))

gottfried



Am 19.02.22 um 23:34 schrieb Gary Johnson:
> Gottfried <gottfried@posteo.de> writes:
> 
>> Next step:
>> How can I install a scanner, because my printer can also scan.
>> I installed a scanning program: "simple scan" "xsane" "gimp"  in
>> hoping to be able to scan. But it doesn't.
> 
> Scanning is also a service in Guix, so you will need to configure it in
> your config.scm. The Guix info manual is very helpful in answering
> questions like this. Here, it looks like the solution is in the manual
> on the page called "Printing Services".
> 
> The service that you need for scanning is called "sane-service-type". It
> looks like it is included by default in the "%desktop-services" list, so
> you should already have it installed. However, it looks like you may
> need to configure the `sane-backends` variable in your config.scm to
> activate scanning for your printer.
> 
> Here is the relevant documentation from the manual:
> 
> ====================================================================
> 
>   -- Scheme Variable: sane-service-type
>       This service provides access to scanners via SANE
>       (http://www.sane-project.org) by installing the necessary udev
>       rules.  It is included in ‘%desktop-services’ (*note Desktop
>       Services::) and relies by default on ‘sane-backends-minimal’
>       package (see below) for hardware support.
> 
>   -- Scheme Variable: sane-backends-minimal
>       The default package which the ‘sane-service-type’ installs.  It
>       supports many recent scanners.
> 
>   -- Scheme Variable: sane-backends
>       This package includes support for all scanners that
>       ‘sane-backends-minimal’ supports, plus older Hewlett-Packard
>       scanners supported by ‘hplip’ package.  In order to use this on a
>       system which relies on ‘%desktop-services’, you may use
>       ‘modify-services’ (*note ‘modify-services’: Service Reference.) as
>       illustrated below:
> 
>            (use-modules (gnu))
>            (use-service-modules
>              ...
>              desktop)
>            (use-package-modules
>              ...
>              scanner)
> 
>            (define %my-desktop-services
>              ;; List of desktop services that supports a broader range of scanners.
>              (modify-services %desktop-services
>                (sane-service-type _ => sane-backends)))
> 
>            (operating-system
>              ...
>              (services %my-desktop-services))
> 
> ====================================================================
> 
> You should follow the steps in the "sane-backends" example to update
> your config.scm file and then rebuild your OS by running this command as
> your regular (non-root) user:
> 
> $ sudo guix system reconfigure config.scm
> 
> Good luck and happy hacking!
>    Gary
> 


--