Hi, Guixers,

I think I managed to add the proposal of Felix Lechner and to set up my 
brackets.

Behind:
(sane-service-type _ => sane-backends))))

I remove one bracket (because the 4. brackets closes "services")

and

behind:

(guix-service-type
          config => (guix-configuration
            (inherit config)
            (extra-options (list "--gc-keep-derivations=yes"
"--gc-keep-outputs=yes"))

I add 3 brackets, to have 5 brackets (the 5. bracket closes "services").

This is how I understand it.
Am I right?

kind regards
Gottfried


My confi.scm before changing the brackets.


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

(use-modules (gnu))
(use-package-modules cups scanner)
(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 "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))))
        (modify-services %desktop-services
		(sane-service-type _ => sane-backends))))
        (guix-service-type
          config => (guix-configuration
            (inherit config)
            (extra-options (list "--gc-keep-derivations=yes"
"--gc-keep-outputs=yes"))

    (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 25.07.22 um 17:20 schrieb Felix Lechner:
> Hi,
> 
> On Mon, Jul 25, 2022 at 2:52 AM Gottfried <gottfried@posteo.de> wrote:
>>
>> The manual says that it is dangerous to use: "guix gc"
>> because it can delete too much.
> 
> I agree that 'guix gc' deletes too much, but it's probably not
> dangerous. You will just see some downloads and builds repeated when
> reconfiguring later.
> 
> I believe 'guix gc' deletes items that are not garbage to me (but I am
> new to Guix). Based on friendly advice I received, I currently use
> these settings:
> 
> (guix-service-type
>    config => (guix-configuration
>      (inherit config)
>      (extra-options (list "--gc-keep-derivations=yes" "--gc-keep-outputs=yes"))
> ...
> 
> Kind regards
> Felix Lechner