965a733220
* gnu/services/avahi.scm (avahi-service): Add URL in docstring. * doc/guix.texi (Networking Services): Document it. (Name Service Switch): Fix cross-reference.
113 lines
4.4 KiB
Scheme
113 lines
4.4 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2014, 2015 Ludovic Courtès <ludo@gnu.org>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (gnu services avahi)
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#:use-module (gnu services)
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#:use-module (gnu system shadow)
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#:use-module (gnu packages avahi)
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#:use-module (gnu packages admin)
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#:use-module (guix monads)
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#:use-module (guix store)
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#:use-module (guix gexp)
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#:export (avahi-service))
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;;; Commentary:
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;;;
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;;; This module provides service definitions for the Avahi
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;;; "zero-configuration" tool set.
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;;;
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;;; Code:
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(define* (configuration-file #:key host-name publish?
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ipv4? ipv6? wide-area? domains-to-browse)
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"Return an avahi-daemon configuration file."
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(define (bool value)
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(if value "yes\n" "no\n"))
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(text-file "avahi-daemon.conf"
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(string-append
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"[server]\n"
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(if host-name
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(string-append "host-name=" host-name "\n")
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"")
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"browse-domains=" (string-join domains-to-browse)
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"\n"
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"use-ipv4=" (bool ipv4?)
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"use-ipv6=" (bool ipv6?)
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"[wide-area]\n"
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"enable-wide-area=" (bool wide-area?)
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"[publish]\n"
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"disable-publishing=" (bool (not publish?)))))
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(define* (avahi-service #:key (avahi avahi)
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host-name
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(publish? #t)
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(ipv4? #t) (ipv6? #t)
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wide-area?
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(domains-to-browse '()))
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"Return a service that runs @command{avahi-daemon}, a system-wide
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mDNS/DNS-SD responder that allows for service discovery and
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\"zero-configuration\" host name lookups (see @uref{http://avahi.org/}).
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If @var{host-name} is different from @code{#f}, use that as the host name to
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publish for this machine; otherwise, use the machine's actual host name.
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When @var{publish?} is true, publishing of host names and services is allowed;
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in particular, avahi-daemon will publish the machine's host name and IP
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address via mDNS on the local network.
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When @var{wide-area?} is true, DNS-SD over unicast DNS is enabled.
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Boolean values @var{ipv4?} and @var{ipv6?} determine whether to use IPv4/IPv6
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sockets."
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(mlet %store-monad ((config (configuration-file #:host-name host-name
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#:publish? publish?
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#:ipv4? ipv4?
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#:ipv6? ipv6?
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#:wide-area? wide-area?
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#:domains-to-browse
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domains-to-browse)))
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(return
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(service
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(documentation "Run the Avahi mDNS/DNS-SD responder.")
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(provision '(avahi-daemon))
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(requirement '(dbus-system networking))
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(start #~(make-forkexec-constructor
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(list (string-append #$avahi "/sbin/avahi-daemon")
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"--syslog" "-f" #$config)))
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(stop #~(make-kill-destructor))
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(activate #~(begin
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(use-modules (guix build utils))
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(mkdir-p "/var/run/avahi-daemon")))
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(user-groups (list (user-group
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(name "avahi")
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(system? #t))))
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(user-accounts (list (user-account
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(name "avahi")
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(group "avahi")
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(system? #t)
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(comment "Avahi daemon user")
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(home-directory "/var/empty")
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(shell
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#~(string-append #$shadow "/sbin/nologin")))))))))
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;;; avahi.scm ends here
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