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Re: Deleting services from %desktop-services in operating system declara

From: swedebugia
Subject: Re: Deleting services from %desktop-services in operating system declaration
Date: Mon, 25 Jan 2016 12:20:02 +0100
User-agent: Riseup mail

On 2016-01-23 17:43, Alex Kost wrote:
address@hidden (2016-01-23 16:09 +0300) wrote:

On 2016-01-21 00:24, address@hidden wrote:
address@hidden skribis:

I have trouble getting the syntax right to delete avahi and wicd from
my config.scm.

The correct syntax would be:

    ;; …
    (services (remove (lambda (service)
                        (or (eq? (service-kind service)
                            (eq? (service-kind service)

I tried this and got this error:
# guix system reconfigure /etc/config/config.scm
guix system: error: failed to load '/etc/config/config.scm':
/etc/config/config.scm:48:12: In procedure #<procedure a7c3530 ()>:
/etc/config/config.scm:48:12: In procedure module-lookup: Unbound
variable: remove

'remove' procedure is from (srfi srfi-1) module, so you need to use it
in your config (see below).

Note that after fixing it, you'll get complaints about other unbound

- 'avahi-service-type': it is from (gnu services avahi);

- 'tor-service': it is from (gnu services networking);

- 'wicd-service-type': it is also from (gnu services networking), but it
  is not exported (I think we should fix it), so now you have to use it
  like this:

  (@@ (gnu services networking) wicd-service-type)

  which means: "give me 'wicd-service-type' from (gnu services
  networking) module, and I don't care if it's not exported".

Config here:

I paste your config here for convenience:

(use-modules (gnu) (gnu system nss))

 (gnu system nss)
 (srfi srfi-1))

(use-service-modules desktop)
(use-package-modules xfce ratpoison certs)

  (host-name "unknown")
  (timezone "Europe/Stockholm")
  (locale "en_US.UTF-8")

  ;; Assuming /dev/sdX is the target hard disk, and "root" is
  ;; the label of the target root file system.
  (bootloader (grub-configuration (device "/dev/sda")))
  (file-systems (cons* (file-system
                        (device "guix")
                        (title 'label)
                        (mount-point "/")
                        (type "ext4"))

                        (device "home")
                        (title 'label)
                        (mount-point "/home")
                        (type "ext4"))

  (swap-devices '("/dev/sdb3"))

  (users (cons (user-account
                (name "sdb")
                (comment "swedebugia")
                (group "users")
                (supplementary-groups '("wheel" "netdev"
                                        "audio" "video"))
                (home-directory "/home/sdb"))

  ;; Add Xfce and Ratpoison; that allows us to choose
  ;; sessions using either of these at the log-in screen.
  (packages (cons* xfce ratpoison    ;desktop environments
                   nss-certs         ;for HTTPS access

  ;; Use the "desktop" services, which include the X11
  ;; log-in service, networking with Wicd, and more.
  (services (remove (lambda (service)
                        (or (eq? (service-kind service)
                            (eq? (service-kind service)
  (services (cons* (tor-service) %desktop-services))

You shouldn't (!) use 'services' (or any other operating-system field
more than *ONCE*).  You can combine 'cons*' and 'remove' like this:

   (cons* (tor-service)
          (remove (lambda (service)
                    (or (eq? (service-kind service)
                        (eq? (service-kind service)
(@@ (gnu services networking) wicd-service-type))
                        (eq? (service-kind service)
(@@ (gnu services networking) ntp-service-type))))

Thanks for the tip on how to combine them!

Note: if you want to remove wicd service, you also need to remove ntp
service, otherwise you'll get:

guix system: error: service 'ntpd' requires 'networking', which is undefined

I got this error a couple of times. Thanks for the explanation - this was really helpful in getting my config to work properly.

I decided to keep wicd after all and just removed avahi. It seems that avahi is also not exported.

The full config with my comments is found here:

I'm effectively learning Scheme/Guile while trying to hack GuixSD and I like it :D


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