200 lines
7.1 KiB
Scheme
200 lines
7.1 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2017 Peter Mikkelsen <petermikkelsen10@gmail.com>
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;;; Copyright © 2019 Ricardo Wurmus <rekado@elephly.net>
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;;; Copyright © 2020 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 audio)
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#:use-module (guix gexp)
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#:use-module (gnu services)
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#:use-module (gnu services shepherd)
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#:use-module (gnu system shadow)
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#:use-module (gnu packages admin)
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#:use-module (gnu packages mpd)
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#:use-module (guix records)
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#:use-module (ice-9 match)
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#:use-module (ice-9 format)
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#:export (mpd-output
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mpd-output?
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mpd-configuration
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mpd-configuration?
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mpd-service-type))
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;;; Commentary:
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;;;
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;;; Audio related services
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;;;
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;;; Code:
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(define-record-type* <mpd-output>
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mpd-output make-mpd-output
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mpd-output?
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(type mpd-output-type
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(default "pulse"))
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(name mpd-output-name
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(default "MPD"))
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(enabled? mpd-output-enabled?
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(default #t))
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(tags? mpd-output-tags?
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(default #t))
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(always-on? mpd-output-always-on?
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(default #f))
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(mixer-type mpd-output-mixer-type
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;; valid: hardware, software, null, none
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(default #f))
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(extra-options mpd-output-extra-options
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(default '())))
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(define-record-type* <mpd-configuration>
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mpd-configuration make-mpd-configuration
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mpd-configuration?
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(user mpd-configuration-user
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(default "mpd"))
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(music-dir mpd-configuration-music-dir
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(default "~/Music"))
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(playlist-dir mpd-configuration-playlist-dir
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(default "~/.mpd/playlists"))
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(db-file mpd-configuration-db-file
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(default "~/.mpd/tag_cache"))
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(state-file mpd-configuration-state-file
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(default "~/.mpd/state"))
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(sticker-file mpd-configuration-sticker-file
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(default "~/.mpd/sticker.sql"))
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(port mpd-configuration-port
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(default "6600"))
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(address mpd-configuration-address
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(default "any"))
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(outputs mpd-configuration-outputs
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(default (list (mpd-output)))))
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(define (mpd-output->string output)
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"Convert the OUTPUT of type <mpd-output> to a configuration file snippet."
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(let ((extra (string-join
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(map (match-lambda
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((key . value)
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(format #f " ~a \"~a\""
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(string-map
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(lambda (c) (if (char=? c #\-) #\_ c))
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(symbol->string key))
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value)))
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(mpd-output-extra-options output))
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"\n")))
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(format #f "\
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audio_output {
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type \"~a\"
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name \"~a\"
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~:[ enabled \"no\"~%~;~]\
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~:[ tags \"no\"~%~;~]\
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~:[~; always_on \"yes\"~%~]\
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~@[ mixer_type \"~a\"~%~]\
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~a~%}~%"
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(mpd-output-type output)
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(mpd-output-name output)
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(mpd-output-enabled? output)
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(mpd-output-tags? output)
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(mpd-output-always-on? output)
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(mpd-output-mixer-type output)
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extra)))
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(define (mpd-config->file config)
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(apply
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mixed-text-file "mpd.conf"
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"pid_file \"" (mpd-file-name config "pid") "\"\n"
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(append (map mpd-output->string
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(mpd-configuration-outputs config))
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(map (match-lambda
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((config-name config-val)
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(string-append config-name " \"" (config-val config) "\"\n")))
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`(("user" ,mpd-configuration-user)
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("music_directory" ,mpd-configuration-music-dir)
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("playlist_directory" ,mpd-configuration-playlist-dir)
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("db_file" ,mpd-configuration-db-file)
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("state_file" ,mpd-configuration-state-file)
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("sticker_file" ,mpd-configuration-sticker-file)
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("port" ,mpd-configuration-port)
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("bind_to_address" ,mpd-configuration-address))))))
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(define (mpd-file-name config file)
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"Return a path in /var/run/mpd/ that is writable
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by @code{user} from @code{config}."
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(string-append "/var/run/mpd/"
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(mpd-configuration-user config)
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"/" file))
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(define (mpd-shepherd-service config)
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(shepherd-service
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(documentation "Run the MPD (Music Player Daemon)")
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(requirement '(user-processes))
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(provision '(mpd))
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(start #~(make-forkexec-constructor
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(list #$(file-append mpd "/bin/mpd")
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"--no-daemon"
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#$(mpd-config->file config))
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#:environment-variables
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;; Required to detect PulseAudio when run under a user account.
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(list (string-append
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"XDG_RUNTIME_DIR=/run/user/"
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(number->string
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(passwd:uid
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(getpwnam #$(mpd-configuration-user config))))))
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#:log-file #$(mpd-file-name config "log")))
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(stop #~(make-kill-destructor))))
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(define (mpd-service-activation config)
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(with-imported-modules '((guix build utils))
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#~(begin
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(use-modules (guix build utils))
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(define %user
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(getpw #$(mpd-configuration-user config)))
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(let ((directory #$(mpd-file-name config ".mpd")))
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(mkdir-p directory)
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(chown directory (passwd:uid %user) (passwd:gid %user))
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;; Make /var/run/mpd/USER user-owned as well.
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(chown (dirname directory)
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(passwd:uid %user) (passwd:gid %user))))))
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(define %mpd-accounts
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;; Default account and group for MPD.
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(list (user-group (name "mpd") (system? #t))
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(user-account
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(name "mpd")
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(group "mpd")
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(system? #t)
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(comment "Music Player Daemon (MPD) user")
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;; Note: /var/run/mpd hosts one sub-directory per user, of which
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;; /var/run/mpd/mpd corresponds to the "mpd" user.
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(home-directory "/var/run/mpd/mpd")
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(shell (file-append shadow "/sbin/nologin")))))
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(define mpd-service-type
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(service-type
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(name 'mpd)
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(description "Run the Music Player Daemon (MPD).")
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(extensions
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(list (service-extension shepherd-root-service-type
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(compose list mpd-shepherd-service))
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(service-extension account-service-type
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(const %mpd-accounts))
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(service-extension activation-service-type
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mpd-service-activation)))
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(default-value (mpd-configuration))))
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