;;; GNU Guix --- Functional package management for GNU ;;; Copyright © 2017 Peter Mikkelsen ;;; Copyright © 2019 Ricardo Wurmus ;;; Copyright © 2020 Ludovic Courtès ;;; Copyright © 2022⁠–⁠2023 Bruno Victal ;;; ;;; This file is part of GNU Guix. ;;; ;;; GNU Guix is free software; you can redistribute it and/or modify it ;;; under the terms of the GNU General Public License as published by ;;; the Free Software Foundation; either version 3 of the License, or (at ;;; your option) any later version. ;;; ;;; GNU Guix is distributed in the hope that it will be useful, but ;;; WITHOUT ANY WARRANTY; without even the implied warranty of ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ;;; GNU General Public License for more details. ;;; ;;; You should have received a copy of the GNU General Public License ;;; along with GNU Guix. If not, see . (define-module (gnu services audio) #:use-module (guix gexp) #:use-module (guix deprecation) #:use-module (guix diagnostics) #:use-module (guix i18n) #:use-module (gnu services) #:use-module (gnu services admin) #:use-module (gnu services configuration) #:use-module (gnu services shepherd) #:use-module (gnu services admin) #:use-module (gnu system shadow) #:use-module (gnu packages admin) #:use-module (gnu packages mpd) #:use-module (guix records) #:use-module (ice-9 format) #:use-module (ice-9 match) #:use-module (srfi srfi-1) #:use-module (srfi srfi-26) #:use-module (srfi srfi-71) #:export (mpd-output mpd-output? mpd-output-name mpd-output-type mpd-output-enabled? mpd-output-format mpd-output-tags? mpd-output-always-on? mpd-output-mixer-type mpd-output-replay-gain-handler mpd-output-extra-options mpd-plugin mpd-plugin? mpd-plugin-plugin mpd-plugin-name mpd-plugin-enabled? mpd-plugin-extra-options mpd-partition mpd-partition? mpd-partition-name mpd-partition-extra-options mpd-configuration mpd-configuration? mpd-configuration-package mpd-configuration-user mpd-configuration-group mpd-configuration-shepherd-requirement mpd-configuration-log-file mpd-configuration-log-level mpd-configuration-music-directory mpd-configuration-music-dir mpd-configuration-playlist-directory mpd-configuration-playlist-dir mpd-configuration-db-file mpd-configuration-state-file mpd-configuration-sticker-file mpd-configuration-default-port mpd-configuration-endpoints mpd-configuration-address mpd-configuration-database mpd-configuration-partitions mpd-configuration-neighbors mpd-configuration-inputs mpd-configuration-archive-plugins mpd-configuration-input-cache-size mpd-configuration-decoders mpd-configuration-resampler mpd-configuration-filters mpd-configuration-outputs mpd-configuration-playlist-plugins mpd-configuration-extra-options mpd-service-type mympd-service-type mympd-configuration mympd-configuration? mympd-configuration-package mympd-configuration-shepherd-requirement mympd-configuration-user mympd-configuration-group mympd-configuration-work-directory mympd-configuration-cache-directory mympd-configuration-acl mympd-configuration-covercache-ttl mympd-configuration-http? mympd-configuration-host mympd-configuration-port mympd-configuration-log-level mympd-configuration-log-to mympd-configuration-lualibs mympd-configuration-uri mympd-configuration-script-acl mympd-configuration-ssl? mympd-configuration-ssl-port mympd-configuration-ssl-cert mympd-configuration-ssl-key mympd-configuration-pin-hash mympd-configuration-save-caches? mympd-ip-acl mympd-ip-acl? mympd-ip-acl-allow mympd-ip-acl-deny)) ;;; Commentary: ;;; ;;; Audio related services ;;; ;;; Code: (define (uglify-field-name field-name) (let ((str (symbol->string field-name))) (string-join (string-split (if (string-suffix? "?" str) (string-drop-right str 1) str) #\-) "_"))) (define list-of-symbol? (list-of symbol?)) (define (mpd-serialize-field field-name value) (let ((field (if (string? field-name) field-name (uglify-field-name field-name))) (value (cond ((boolean? value) (if value "yes" "no")) ((string? value) value) (else (object->string value))))) #~(format #f "~a ~s~%" #$field #$value))) (define (mpd-serialize-alist field-name value) #~(string-append #$@(generic-serialize-alist list mpd-serialize-field value))) (define mpd-serialize-string mpd-serialize-field) (define mpd-serialize-boolean mpd-serialize-field) (define (mpd-serialize-list-of-strings field-name value) #~(string-append #$@(map (cut mpd-serialize-string field-name <>) value))) (define-maybe string (prefix mpd-)) (define-maybe list-of-strings (prefix mpd-)) (define-maybe boolean (prefix mpd-)) ;;; TODO: Procedures for deprecated fields, to be removed. (define mpd-deprecated-fields '((music-dir . music-directory) (playlist-dir . playlist-directory) (address . endpoints))) (define (port? value) (or (string? value) (integer? value))) (define (mpd-serialize-deprecated-field field-name value) (if (maybe-value-set? value) (begin (warn-about-deprecation field-name #f #:replacement (assoc-ref mpd-deprecated-fields field-name)) (match field-name ('playlist-dir (mpd-serialize-string "playlist_directory" value)) ('music-dir (mpd-serialize-string "music_directory" value)) ('address (mpd-serialize-string "bind_to_address" value)))) "")) (define (mpd-serialize-port field-name value) (when (string? value) (warning (G_ "string value for '~a' is deprecated, use integer instead~%") field-name)) (mpd-serialize-field "port" value)) (define-maybe port (prefix mpd-)) ;;; ;; Generic MPD plugin record, lists only the most prevalent fields. (define-configuration mpd-plugin (plugin maybe-string "Plugin name.") (name maybe-string "Name.") (enabled? maybe-boolean "Whether the plugin is enabled/disabled.") (extra-options (alist '()) "An association list of option symbols/strings to string values to be appended to the plugin configuration. See @uref{https://mpd.readthedocs.io/en/latest/plugins.html,MPD plugin reference} for available options.") (prefix mpd-)) (define (mpd-serialize-mpd-plugin field-name value) #~(format #f "~a {~%~a}~%" '#$field-name #$(serialize-configuration value mpd-plugin-fields))) (define (mpd-serialize-list-of-mpd-plugin field-name value) #~(string-append #$@(map (cut mpd-serialize-mpd-plugin field-name <>) value))) (define list-of-mpd-plugin? (list-of mpd-plugin?)) (define-maybe mpd-plugin (prefix mpd-)) (define-configuration mpd-partition (name string "Partition name.") (extra-options (alist '()) "An association list of option symbols/strings to string values to be appended to the partition configuration. See @uref{https://mpd.readthedocs.io/en/latest/user.html#configuring-partitions,Configuring Partitions} for available options.") (prefix mpd-)) (define (mpd-serialize-mpd-partition field-name value) #~(format #f "partition {~%~a}~%" #$(serialize-configuration value mpd-partition-fields))) (define (mpd-serialize-list-of-mpd-partition field-name value) #~(string-append #$@(map (cut mpd-serialize-mpd-partition #f <>) value))) (define list-of-mpd-partition? (list-of mpd-partition?)) (define-configuration mpd-output (name (string "MPD") "The name of the audio output.") (type (string "pulse") "The type of audio output.") (enabled? (boolean #t) "Specifies whether this audio output is enabled when MPD is started. By default, all audio outputs are enabled. This is just the default setting when there is no state file; with a state file, the previous state is restored.") (format maybe-string "Force a specific audio format on output. See @uref{https://mpd.readthedocs.io/en/latest/user.html#audio-output-format,Global Audio Format} for a more detailed description.") (tags? (boolean #t) "If set to @code{#f}, then MPD will not send tags to this output. This is only useful for output plugins that can receive tags, for example the @code{httpd} output plugin.") (always-on? (boolean #f) "If set to @code{#t}, then MPD attempts to keep this audio output always open. This may be useful for streaming servers, when you don’t want to disconnect all listeners even when playback is accidentally stopped.") (mixer-type (string "none") "This field accepts a string that specifies which mixer should be used for this audio output: the @code{hardware} mixer, the @code{software} mixer, the @code{null} mixer (allows setting the volume, but with no effect; this can be used as a trick to implement an external mixer External Mixer) or no mixer (@code{none}).") (replay-gain-handler maybe-string "This field accepts a string that specifies how @uref{https://mpd.readthedocs.io/en/latest/user.html#replay-gain,Replay Gain} is to be applied. @code{software} uses an internal software volume control, @code{mixer} uses the configured (hardware) mixer control and @code{none} disables replay gain on this audio output.") (extra-options (alist '()) "An association list of option symbols/strings to string values to be appended to the audio output configuration.") (prefix mpd-)) (define (mpd-serialize-mpd-output field-name value) #~(format #f "audio_output {~%~a}~%" #$(serialize-configuration value mpd-output-fields))) (define (mpd-serialize-list-of-mpd-plugin-or-output field-name value) (let ((plugins outputs (partition mpd-plugin? value))) #~(string-append #$@(map (cut mpd-serialize-mpd-plugin "audio_output" <>) plugins) #$@(map (cut mpd-serialize-mpd-output #f <>) outputs)))) (define list-of-mpd-plugin-or-output? (list-of (lambda (x) (or (mpd-output? x) (mpd-plugin? x))))) (define-configuration mpd-configuration (package (file-like mpd) "The MPD package." empty-serializer) (user (string "mpd") "The user to run mpd as.") (group (string "mpd") "The group to run mpd as.") (shepherd-requirement (list-of-symbol '()) "This is a list of symbols naming Shepherd services that this service will depend on." empty-serializer) (environment-variables (list-of-strings '()) "A list of strings specifying environment variables." empty-serializer) (log-file (maybe-string "/var/log/mpd/log") "The location of the log file. Set to @code{syslog} to use the local syslog daemon or @code{%unset-value} to omit this directive from the configuration file.") (log-level maybe-string "Supress any messages below this threshold. Available values: @code{notice}, @code{info}, @code{verbose}, @code{warning} and @code{error}.") (music-directory maybe-string "The directory to scan for music files.") (music-dir ; TODO: deprecated, remove later maybe-string "The directory to scan for music files." mpd-serialize-deprecated-field) (playlist-directory maybe-string "The directory to store playlists.") (playlist-dir ; TODO: deprecated, remove later maybe-string "The directory to store playlists." mpd-serialize-deprecated-field) (db-file maybe-string "The location of the music database.") (state-file maybe-string "The location of the file that stores current MPD's state.") (sticker-file maybe-string "The location of the sticker database.") (default-port (maybe-port 6600) "The default port to run mpd on.") (endpoints maybe-list-of-strings "The addresses that mpd will bind to. A port different from @var{default-port} may be specified, e.g. @code{localhost:6602} and IPv6 addresses must be enclosed in square brackets when a different port is used. To use a Unix domain socket, an absolute path or a path starting with @code{~} can be specified here." (lambda (_ endpoints) (if (maybe-value-set? endpoints) (mpd-serialize-list-of-strings "bind_to_address" endpoints) ""))) (address ; TODO: deprecated, remove later maybe-string "The address that mpd will bind to. To use a Unix domain socket, an absolute path can be specified here." mpd-serialize-deprecated-field) (database maybe-mpd-plugin "MPD database plugin configuration.") (partitions (list-of-mpd-partition '()) "List of MPD \"partitions\".") (neighbors (list-of-mpd-plugin '()) "List of MPD neighbor plugin configurations.") (inputs (list-of-mpd-plugin '()) "List of MPD input plugin configurations." (lambda (_ x) (mpd-serialize-list-of-mpd-plugin "input" x))) (archive-plugins (list-of-mpd-plugin '()) "List of MPD archive plugin configurations." (lambda (_ x) (mpd-serialize-list-of-mpd-plugin "archive_plugin" x))) (input-cache-size maybe-string "MPD input cache size." (lambda (_ x) (if (maybe-value-set? x) #~(string-append "\ninput_cache {\n" #$(mpd-serialize-string "size" x) "}\n") ""))) (decoders (list-of-mpd-plugin '()) "List of MPD decoder plugin configurations." (lambda (_ x) (mpd-serialize-list-of-mpd-plugin "decoder" x))) (resampler maybe-mpd-plugin "MPD resampler plugin configuration.") (filters (list-of-mpd-plugin '()) "List of MPD filter plugin configurations." (lambda (_ x) (mpd-serialize-list-of-mpd-plugin "filter" x))) (outputs (list-of-mpd-plugin-or-output (list (mpd-output))) "The audio outputs that MPD can use. By default this is a single output using pulseaudio.") (playlist-plugins (list-of-mpd-plugin '()) "List of MPD playlist plugin configurations." (lambda (_ x) (mpd-serialize-list-of-mpd-plugin "playlist_plugin" x))) (extra-options (alist '()) "An association list of option symbols/strings to string values to be appended to the configuration.") (prefix mpd-)) (define (mpd-serialize-configuration configuration) (mixed-text-file "mpd.conf" (serialize-configuration configuration mpd-configuration-fields))) (define (mpd-log-rotation config) (match-record config (log-file) (log-rotation (files (list log-file)) (post-rotate #~(begin (use-modules (gnu services herd)) (with-shepherd-action 'mpd ('reopen) #f)))))) (define (mpd-shepherd-service config) (match-record config (user package shepherd-requirement log-file playlist-directory db-file state-file sticker-file environment-variables) (let* ((config-file (mpd-serialize-configuration config))) (shepherd-service (documentation "Run the MPD (Music Player Daemon)") (requirement `(user-processes loopback ,@shepherd-requirement)) (provision '(mpd)) (start #~(begin (and=> #$(maybe-value log-file) (compose mkdir-p dirname)) (let ((user (getpw #$user))) (for-each (lambda (x) (when (and x (not (file-exists? x))) (mkdir-p x) (chown x (passwd:uid user) (passwd:gid user)))) (list #$(maybe-value playlist-directory) (and=> #$(maybe-value db-file) dirname) (and=> #$(maybe-value state-file) dirname) (and=> #$(maybe-value sticker-file) dirname)))) (make-forkexec-constructor (list #$(file-append package "/bin/mpd") "--no-daemon" #$config-file) #:environment-variables '#$environment-variables))) (stop #~(make-kill-destructor)) (actions (list (shepherd-configuration-action config-file) (shepherd-action (name 'reopen) (documentation "Re-open log files and flush caches.") (procedure #~(lambda (pid) (if pid (begin (kill pid SIGHUP) (format #t "Issued SIGHUP to Service MPD (PID ~a)." pid)) (format #t "Service MPD is not running."))))))))))) (define (mpd-accounts config) (match-record config (user group) (list (user-group (name group) (system? #t)) (user-account (name user) (group group) (system? #t) (comment "Music Player Daemon (MPD) user") ;; MPD can use $HOME (or $XDG_CONFIG_HOME) to place its data (home-directory "/var/lib/mpd") (shell (file-append shadow "/sbin/nologin")))))) (define mpd-service-type (service-type (name 'mpd) (description "Run the Music Player Daemon (MPD).") (extensions (list (service-extension shepherd-root-service-type (compose list mpd-shepherd-service)) (service-extension account-service-type mpd-accounts) (service-extension rottlog-service-type (compose list mpd-log-rotation)))) (default-value (mpd-configuration)))) ;;; ;;; myMPD ;;; (define (string-or-symbol? x) (or (symbol? x) (string? x))) (define-configuration/no-serialization mympd-ip-acl (allow (list-of-strings '()) "Allowed IP addresses.") (deny (list-of-strings '()) "Disallowed IP addresses.")) (define-maybe/no-serialization integer) (define-maybe/no-serialization mympd-ip-acl) ;; XXX: The serialization procedures are insufficient since we require ;; access to multiple fields at once. ;; Fields marked with empty-serializer are never serialized and are ;; used for command-line arguments or by the service definition. (define-configuration/no-serialization mympd-configuration (package (file-like mympd) "The package object of the myMPD server." empty-serializer) (shepherd-requirement (list-of-symbol '()) "This is a list of symbols naming Shepherd services that this service will depend on." empty-serializer) (user (string "mympd") "Owner of the @command{mympd} process." empty-serializer) (group (string "nogroup") "Owner group of the @command{mympd} process." empty-serializer) (work-directory (string "/var/lib/mympd") "Where myMPD will store its data." empty-serializer) (cache-directory (string "/var/cache/mympd") "Where myMPD will store its cache." empty-serializer) (acl maybe-mympd-ip-acl "ACL to access the myMPD webserver.") (covercache-ttl (maybe-integer 31) "How long to keep cached covers, @code{0} disables cover caching.") (http? (boolean #t) "HTTP support.") (host (string "[::]") "Host name to listen on.") (port (maybe-port 80) "HTTP port to listen on.") (log-level (integer 5) "How much detail to include in logs, possible values: @code{0} to @code{7}.") (log-to (string-or-symbol "/var/log/mympd/log") "Where to send logs. By default, the service logs to @file{/var/log/mympd.log}. The alternative is @code{'syslog}, which sends output to the running syslog service under the @samp{daemon} facility." empty-serializer) (lualibs (maybe-string "all") "See @url{https://jcorporation.github.io/myMPD/scripting/#lua-standard-libraries}.") (uri maybe-string "Override URI to myMPD. See @url{https://github.com/jcorporation/myMPD/issues/950}.") (script-acl (maybe-mympd-ip-acl (mympd-ip-acl (allow '("127.0.0.1")))) "ACL to access the myMPD script backend.") (ssl? (boolean #f) "SSL/TLS support.") (ssl-port (maybe-port 443) "Port to listen for HTTPS.") (ssl-cert maybe-string "Path to PEM encoded X.509 SSL/TLS certificate (public key).") (ssl-key maybe-string "Path to PEM encoded SSL/TLS private key.") (pin-hash maybe-string "SHA-256 hashed pin used by myMPD to control settings access by prompting a pin from the user.") (save-caches? maybe-boolean "Whether to preserve caches between service restarts.")) (define (mympd-serialize-configuration config) (define serialize-value (match-lambda ((? boolean? val) (if val "true" "false")) ((? integer? val) (number->string val)) ((? mympd-ip-acl? val) (ip-acl-serialize-configuration val)) ((? string? val) val))) (define (ip-acl-serialize-configuration config) (define (serialize-list-of-strings prefix lst) (map (cut format #f "~a~a" prefix <>) lst)) (string-join (append (serialize-list-of-strings "+" (mympd-ip-acl-allow config)) (serialize-list-of-strings "-" (mympd-ip-acl-deny config))) ",")) ;; myMPD configuration fields are serialized as individual files under ;; /config/. (match-record config (work-directory acl covercache-ttl http? host port log-level lualibs uri script-acl ssl? ssl-port ssl-cert ssl-key pin-hash save-caches?) (define (serialize-field filename value) (when (maybe-value-set? value) (list (format #f "~a/config/~a" work-directory filename) (mixed-text-file filename (serialize-value value))))) (let ((filename-to-field `(("acl" . ,acl) ("covercache_keep_days" . ,covercache-ttl) ("http" . ,http?) ("http_host" . ,host) ("http_port" . ,port) ("loglevel" . ,log-level) ("lualibs" . ,lualibs) ("mympd_uri" . ,uri) ("scriptacl" . ,script-acl) ("ssl" . ,ssl?) ("ssl_port" . ,ssl-port) ("ssl_cert" . ,ssl-cert) ("ssl_key" . ,ssl-key) ("pin_hash" . ,pin-hash) ("save_caches" . ,save-caches?)))) (filter list? (generic-serialize-alist list serialize-field filename-to-field))))) (define (mympd-shepherd-service config) (match-record config (package shepherd-requirement user work-directory cache-directory log-level log-to) (let ((log-level* (format #f "MYMPD_LOGLEVEL=~a" log-level))) (shepherd-service (documentation "Run the myMPD daemon.") (requirement `(loopback user-processes ,@(if (eq? log-to 'syslog) '(syslog) '()) ,@shepherd-requirement)) (provision '(mympd)) (start #~(begin (let* ((pw (getpwnam #$user)) (uid (passwd:uid pw)) (gid (passwd:gid pw))) (for-each (lambda (dir) (mkdir-p dir) (chown dir uid gid)) (list #$work-directory #$cache-directory))) (make-forkexec-constructor `(#$(file-append package "/bin/mympd") "--user" #$user #$@(if (eqv? log-to 'syslog) '("--syslog") '()) "--workdir" #$work-directory "--cachedir" #$cache-directory) #:environment-variables (list #$log-level*) #:log-file #$(if (string? log-to) log-to #f)))) (stop #~(make-kill-destructor)))))) (define (mympd-accounts config) (match-record config (user group) (list (user-group (name group) (system? #t)) (user-account (name user) (group group) (system? #t) (comment "myMPD user") (home-directory "/var/empty") (shell (file-append shadow "/sbin/nologin")))))) (define (mympd-log-rotation config) (match-record config (log-to) (if (string? log-to) (list (log-rotation (files (list log-to)))) '()))) (define mympd-service-type (service-type (name 'mympd) (extensions (list (service-extension shepherd-root-service-type (compose list mympd-shepherd-service)) (service-extension account-service-type mympd-accounts) (service-extension special-files-service-type mympd-serialize-configuration) (service-extension rottlog-service-type mympd-log-rotation))) (description "Run myMPD, a frontend for MPD. (Music Player Daemon)") (default-value (mympd-configuration))))