Re: How to configure a printer on Guix System

[Christophe Pisteur <christophe.pisteur@fsfe.org>]

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Le samedi 16 mai 2020 à 15:27 +0200, Marius Bakke a écrit :
> Christophe Pisteur <christophe.pisteur@fsfe.org> writes:
> 
> > Le vendredi 15 mai 2020 à 17:33 +0200, Tobias Geerinckx-Rice a
> > écrit :
> > > Christophe,
> > > 
> > > (...)
> > > (Guix) System software is started by services that are part of 
> > > your OPERATING-SYSTEM.  Here's part of my laptop's CUPS 
> > > configuration:
> > > 
> > >   (use-service-modules ···
> > >                        cups
> > >                        ···)
> > >   (operating-system
> > >     (services
> > >      (cons* ···
> > >        (service cups-service-type
> > >         (cups-configuration
> > >          (extensions
> > >           (list hplip-minimal
> > >                 ;; Required to display printer options,
> > >                 ;; even with IPP Everywhere everywhere.
> > >                 cups-filters
> > >                 ;; Other possible legacy drivers:
> > >                 ;; escpr foo2zjs foomatic-filters
> > >                 ;; hplip-minimal splix
> > >                 ))
> > >          (server-name host-name)
> > >          (host-name-lookups #t)
> > >          (web-interface? #t)
> > >          (default-paper-size "A4")
> > >          ;; You get the idea.
> > >          ···))
> > >        ···
> > >        %base-services-or-whatever)))
> > 
> > Thank you for the explanation and for sharing this configuration.
> > My
> > problem is that I still don't understand guix well enough: I don't
> > know
> > in which file to write this configuration of cups (name and path),
> > nor
> > with what tool to define it (nano, terminal, etc.).
> 
> Guix is deceptively simple.  This goes in your /etc/config.scm, like
> any other system-level change.  You probably already have a (services
> ...) in there: the challenge is to sew in the stanza provided by
> Tobias with your existing configuration.
> 
> Afterwards you need to run 'guix system reconfigure /etc/config.scm'.
> 
> > Perhaps I do not have enough computer background to use guix to
> > date. It does not matter, I will eventually learn over time, not to
> > mention that some functions will be automated with the evolution of
> > the project, as is the case for the graphic installation.
> 
> You should not need a computer background to use Guix.  In fact _no_
> background may be better, as Guix is radically different from any
> other operating system you may have used (unless you come from
> NixOS).
> 
> The only thing required is patience to read the manual, and the
> courage to ask on IRC or mailing lists if you get stuck.  :-)

Hello, 

Thank you for the detailed explanations. I'm almost there:
- I modified the file /etc/config.scm according to the indications of 
Tobias G-R, added (gnu packages cups) in "use-modules", then performed
"guix reconfigure /etc/config.scm" and after restarting, I was able to
access the web interface of cups (http://localhost:631/).
- I added my network printer, used the ppd file from openprinting.org, 
and the printer is recognized.
- when I print the test page, the cups web interface says that the 
connection with the printer is established, but the printing fails due 
to the error: "Filter failed".

In attached document, my config.scm file to know if it contains an
error and which filters are installed. 

Any idea?

Christophe

[-- Attachment #2: config.scm --]
[-- Type: text/x-scheme, Size: 1779 bytes --]

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

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

(operating-system
  (locale "fr_CH.utf8")
  (timezone "Europe/Zurich")
  (keyboard-layout (keyboard-layout "ch" "fr"))
  (host-name "t400")
  (users (cons* (user-account
                  (name "christophe")
                  (comment "Christophe Pisteur")
                  (group "users")
                  (home-directory "/home/christophe")
                  (supplementary-groups
                    '("wheel" "netdev" "audio" "video")))
                %base-user-accounts))
  (packages
    (append
      (list (specification->package "nss-certs"))
      %base-packages))
  (services
    (append
      (list (service gnome-desktop-service-type)
            (service openssh-service-type)
            (set-xorg-configuration
              (xorg-configuration
                (keyboard-layout keyboard-layout)))
            (service cups-service-type
              (cups-configuration
                (extensions
                  (list cups-filters hplip-minimal))
                (server-name host-name)
                (host-name-lookups #t)
                (web-interface? #t)
                (default-paper-size "A4"))))               
      %desktop-services))
  (bootloader
    (bootloader-configuration
      (bootloader grub-bootloader)
      (target "/dev/sda")
      (keyboard-layout keyboard-layout)))
  (swap-devices (list "/dev/sda1"))
  (file-systems
    (cons* (file-system
             (mount-point "/")
             (device
               (uuid "bfbee58e-496c-4f01-8b8a-2959c505c936"
                     'ext4))
             (type "ext4"))
           %base-file-systems)))