{ config, lib, pkgs, ... }: with lib; let name = "mpd"; uid = config.ids.uids.mpd; gid = config.ids.gids.mpd; cfg = config.services.mpd; mpdConf = pkgs.writeText "mpd.conf" '' music_directory "${cfg.musicDirectory}" playlist_directory "${cfg.playlistDirectory}" ${lib.optionalString (cfg.dbFile != null) '' db_file "${cfg.dbFile}" ''} state_file "${cfg.dataDir}/state" sticker_file "${cfg.dataDir}/sticker.sql" log_file "syslog" user "${cfg.user}" group "${cfg.group}" ${optionalString (cfg.network.listenAddress != "any") ''bind_to_address "${cfg.network.listenAddress}"''} ${optionalString (cfg.network.port != 6600) ''port "${toString cfg.network.port}"''} ${cfg.extraConfig} ''; in { ###### interface options = { services.mpd = { enable = mkOption { type = types.bool; default = false; description = '' Whether to enable MPD, the music player daemon. ''; }; startWhenNeeded = mkOption { type = types.bool; default = false; description = '' If set, mpd is socket-activated; that is, instead of having it permanently running as a daemon, systemd will start it on the first incoming connection. ''; }; musicDirectory = mkOption { type = with types; either path (strMatching "(http|https|nfs|smb)://.+"); default = "${cfg.dataDir}/music"; defaultText = ''''${dataDir}/music''; description = '' The directory or NFS/SMB network share where mpd reads music from. ''; }; playlistDirectory = mkOption { type = types.path; default = "${cfg.dataDir}/playlists"; defaultText = ''''${dataDir}/playlists''; description = '' The directory where mpd stores playlists. ''; }; extraConfig = mkOption { type = types.lines; default = ""; description = '' Extra directives added to to the end of MPD's configuration file, mpd.conf. Basic configuration like file location and uid/gid is added automatically to the beginning of the file. For available options see man 5 mpd.conf'. ''; }; dataDir = mkOption { type = types.path; default = "/var/lib/${name}"; description = '' The directory where MPD stores its state, tag cache, playlists etc. ''; }; user = mkOption { type = types.str; default = name; description = "User account under which MPD runs."; }; group = mkOption { type = types.str; default = name; description = "Group account under which MPD runs."; }; network = { listenAddress = mkOption { type = types.str; default = "127.0.0.1"; example = "any"; description = '' The address for the daemon to listen on. Use any to listen on all addresses. ''; }; port = mkOption { type = types.int; default = 6600; description = '' This setting is the TCP port that is desired for the daemon to get assigned to. ''; }; }; dbFile = mkOption { type = types.nullOr types.str; default = "${cfg.dataDir}/tag_cache"; defaultText = ''''${dataDir}/tag_cache''; description = '' The path to MPD's database. If set to null the parameter is omitted from the configuration. ''; }; }; }; ###### implementation config = mkIf cfg.enable { systemd.sockets.mpd = mkIf cfg.startWhenNeeded { description = "Music Player Daemon Socket"; wantedBy = [ "sockets.target" ]; listenStreams = [ "${optionalString (cfg.network.listenAddress != "any") "${cfg.network.listenAddress}:"}${toString cfg.network.port}" ]; socketConfig = { Backlog = 5; KeepAlive = true; PassCredentials = true; }; }; systemd.tmpfiles.rules = [ "d '${cfg.dataDir}' - ${cfg.user} ${cfg.group} - -" "d '${cfg.playlistDirectory}' - ${cfg.user} ${cfg.group} - -" ]; systemd.services.mpd = { after = [ "network.target" "sound.target" ]; description = "Music Player Daemon"; wantedBy = optional (!cfg.startWhenNeeded) "multi-user.target"; serviceConfig = { User = "${cfg.user}"; ExecStart = "${pkgs.mpd}/bin/mpd --no-daemon ${mpdConf}"; Type = "notify"; LimitRTPRIO = 50; LimitRTTIME = "infinity"; ProtectSystem = true; NoNewPrivileges = true; ProtectKernelTunables = true; ProtectControlGroups = true; ProtectKernelModules = true; RestrictAddressFamilies = "AF_INET AF_INET6 AF_UNIX AF_NETLINK"; RestrictNamespaces = true; }; }; users.users = optionalAttrs (cfg.user == name) (singleton { inherit uid; inherit name; group = cfg.group; extraGroups = [ "audio" ]; description = "Music Player Daemon user"; home = "${cfg.dataDir}"; }); users.groups = optionalAttrs (cfg.group == name) (singleton { inherit name; gid = gid; }); }; }