From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andreas Enge <andreas@enge.fr>
Subject: Re: [PATCH] gnu: Add gnome.
Date: Wed, 24 Feb 2016 13:18:09 +0100
Message-ID: <20160224121809.GA22950@solar>
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To: Jan Nieuwenhuizen <janneke@gnu.org>
Cc: guix-devel@gnu.org, =?utf-8?B?5a6L5paH5q2m?= <iyzsong@gmail.com>

On Tue, Feb 23, 2016 at 10:18:45PM +0100, Jan Nieuwenhuizen wrote:
>   (services
>    (cons* (console-keymap-service "dvorak")
>           ;;(dhcp-client-service)
>           (lsh-service #:port-number 2222
>                        #:allow-empty-passwords? #t
>                        #:root-login? #t)
>           %desktop-services))
> 
> Uncommenting (dhcp-client-service) gives the error
> 
>     guix system: error: service 'networking' provided more than once
> 
> but having it commented-out like this I cannot login with ssh to the
> vm...and I cannot investigate what may have triggered the opaque error
> message...puzzled

This is due to the fact that %desktop-services includes wicd-service.
Somewhere in the current documentation there is a paragraph that explains
how to delete a service from a list of services (which is a bit more
complicated than just removing a fixed variable, and amounts to checking
the type of a service), but I have trouble finding it again.
Ah, one needs to iterate over the services s in the list and test
(eq? (service-kind s) some-service-type).

Andreas