21b71b01e9
* gnu/services/admin.scm (rottlog-service-type) (tailon-service-type): Add 'description' field. * gnu/services/audio.scm (mpd-service-type): Likewise. * gnu/services/avahi.scm (avahi-service-type): Likewise. * gnu/services/ssh.scm (lsh-service-type) (openssh-service-type, dropbear-service-type): Likewise.
175 lines
7.2 KiB
Scheme
175 lines
7.2 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2014, 2015, 2016, 2017 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 services base)
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#:use-module (gnu services shepherd)
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#:use-module (gnu services dbus)
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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 records)
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#:use-module (guix gexp)
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#:export (avahi-configuration
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avahi-service
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avahi-service-type))
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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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;; TODO: Export.
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(define-record-type* <avahi-configuration>
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avahi-configuration make-avahi-configuration
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avahi-configuration?
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(avahi avahi-configuration-avahi ;<package>
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(default avahi))
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(debug? avahi-configuration-debug? ;Boolean
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(default #f))
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(host-name avahi-configuration-host-name) ;string
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(publish? avahi-configuration-publish?) ;Boolean
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(ipv4? avahi-configuration-ipv4?) ;Boolean
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(ipv6? avahi-configuration-ipv6?) ;Boolean
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(wide-area? avahi-configuration-wide-area?) ;Boolean
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(domains-to-browse avahi-configuration-domains-to-browse)) ;list of strings
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(define* (configuration-file config)
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"Return an avahi-daemon configuration file based on CONFIG, an
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<avahi-configuration>."
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(define (bool value)
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(if value "yes\n" "no\n"))
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(define host-name (avahi-configuration-host-name config))
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(plain-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
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(avahi-configuration-domains-to-browse
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config))
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"\n"
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"use-ipv4=" (bool (avahi-configuration-ipv4? config))
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"use-ipv6=" (bool (avahi-configuration-ipv6? config))
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"[wide-area]\n"
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"enable-wide-area=" (bool (avahi-configuration-wide-area? config))
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"[publish]\n"
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"disable-publishing="
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(bool (not (avahi-configuration-publish? config))))))
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(define %avahi-accounts
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;; Account and group for the Avahi daemon.
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(list (user-group (name "avahi") (system? #t))
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(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 (file-append shadow "/sbin/nologin")))))
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(define %avahi-activation
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;; Activation gexp.
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#~(begin
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(use-modules (guix build utils))
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(mkdir-p "/var/run/avahi-daemon")))
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(define (avahi-shepherd-service config)
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"Return a list of <shepherd-service> for CONFIG."
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(let ((config (configuration-file config))
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(debug? (avahi-configuration-debug? config))
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(avahi (avahi-configuration-avahi config)))
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(list (shepherd-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 #$(file-append avahi "/sbin/avahi-daemon")
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"--daemonize"
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#$@(if debug? #~("--debug") #~())
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"-f" #$config)
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#:pid-file "/var/run/avahi-daemon/pid"))
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(stop #~(make-kill-destructor))))))
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(define avahi-service-type
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(let ((avahi-package (compose list avahi-configuration-avahi)))
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(service-type (name 'avahi)
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(description
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"Run @command{avahi-daemon}, a host and service discovery
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daemon that implements the multicast DNS (mDNS) and DNS service
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discovery (DNS-SD) protocols. Additionally, extend the C library's name
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service switch (NSS) with support for @code{.local} host name resolution.")
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(extensions
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(list (service-extension shepherd-root-service-type
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avahi-shepherd-service)
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(service-extension dbus-root-service-type
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avahi-package)
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(service-extension account-service-type
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(const %avahi-accounts))
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(service-extension activation-service-type
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(const %avahi-activation))
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(service-extension nscd-service-type
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(const (list nss-mdns)))
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;; Provide 'avahi-browse', 'avahi-resolve', etc. in
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;; the system profile.
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(service-extension profile-service-type
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avahi-package))))))
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(define* (avahi-service #:key (avahi avahi) debug?
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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/}), and
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extends the name service cache daemon (nscd) so that it can resolve
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@code{.local} host names using
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@uref{http://0pointer.de/lennart/projects/nss-mdns/, nss-mdns}. Additionally,
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add the @var{avahi} package to the system profile so that commands such as
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@command{avahi-browse} are directly usable.
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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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(service avahi-service-type
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(avahi-configuration
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(avahi avahi) (debug? debug?) (host-name host-name)
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(publish? publish?) (ipv4? ipv4?) (ipv6? ipv6?)
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(wide-area? wide-area?)
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(domains-to-browse domains-to-browse))))
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;;; avahi.scm ends here
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