[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: Deleting services from %desktop-services in operating system declara
From: |
Thompson, David |
Subject: |
Re: Deleting services from %desktop-services in operating system declaration |
Date: |
Wed, 20 Jan 2016 09:17:15 -0500 |
On Wed, Jan 20, 2016 at 7:42 AM, <address@hidden> wrote:
> Hi
>
> I have trouble getting the syntax right to delete avahi and wicd from my
> config.scm.
>
> This did not work (inspecting with the REPL):
> (services (cons* (tor-service) %desktop-services))
> (modify-services (alist-delete
> wicd-service
> %desktop-services))
> (modify-services (alist-delete
> avahi-service
> %desktop-services))
>
> Neither this:
> (services (cons* (tor-service) %desktop-services))
> (modify-services (alist-delete
> wicd-service
> avahi-service
> %desktop-services))
>
> The manual does not yet have examples of how to delete one or more entries
> from the %base-services or other lists.
>
> Help would be appreciated :)
First of all, %desktop-services is *not* an alist, so using
alist-delete certainly won't work. Second, modify-services is
*syntax*, so the form (alist-delete ...) is surely the wrong syntax.
Below is the docstring for modify-services:
Modify the services listed in SERVICES according to CLAUSES. Each clause
must have the form:
(TYPE VARIABLE => BODY)
where TYPE is a service type, such as 'guix-service-type', and VARIABLE is an
identifier that is bound within BODY to the value of the service of that
TYPE. Consider this example:
(modify-services %base-services
(guix-service-type config =>
(guix-configuration
(inherit config)
(use-substitutes? #f)
(extra-options '(\"--gc-keep-derivations\"))))
(mingetty-service-type config =>
(mingetty-configuration
(inherit config)
(motd (plain-file \"motd\" \"Hi there!\")))))
It changes the configuration of the GUIX-SERVICE-TYPE instance, and that of
all the MINGETTY-SERVICE-TYPE instances.
This is a shorthand for (map (lambda (svc) ...) %base-services).
Hopefully that provides enough of an example for you! You can
retrieve the documentation associated with an object at the Guile
REPL. Here's how you'd get this one:
$ ./pre-inst-env guile
GNU Guile 2.0.11
Copyright (C) 1995-2014 Free Software Foundation, Inc.
Guile comes with ABSOLUTELY NO WARRANTY; for details type `,show w'.
This program is free software, and you are welcome to redistribute it
under certain conditions; type `,show c' for details.
Enter `,help' for help.
scheme@(guile-user)> ,use (gnu services)
scheme@(guile-user)> ,describe modify-services
- Dave