Re: printer installed, now scanner ?

[Gottfried]

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


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