282 lines
8.7 KiB
Nix
282 lines
8.7 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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name = "mpd";
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uid = config.ids.uids.mpd;
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gid = config.ids.gids.mpd;
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cfg = config.services.mpd;
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credentialsPlaceholder = (creds:
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let
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placeholders = (imap0
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(i: c: ''password "{{password-${toString i}}}@${concatStringsSep "," c.permissions}"'')
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creds);
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in
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concatStringsSep "\n" placeholders);
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mpdConf = pkgs.writeText "mpd.conf" ''
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# This file was automatically generated by NixOS. Edit mpd's configuration
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# via NixOS' configuration.nix, as this file will be rewritten upon mpd's
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# restart.
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music_directory "${cfg.musicDirectory}"
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playlist_directory "${cfg.playlistDirectory}"
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${lib.optionalString (cfg.dbFile != null) ''
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db_file "${cfg.dbFile}"
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''}
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state_file "${cfg.dataDir}/state"
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sticker_file "${cfg.dataDir}/sticker.sql"
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${optionalString (cfg.network.listenAddress != "any") ''bind_to_address "${cfg.network.listenAddress}"''}
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${optionalString (cfg.network.port != 6600) ''port "${toString cfg.network.port}"''}
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${optionalString (cfg.fluidsynth) ''
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decoder {
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plugin "fluidsynth"
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soundfont "${pkgs.soundfont-fluid}/share/soundfonts/FluidR3_GM2-2.sf2"
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}
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''}
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${optionalString (cfg.credentials != []) (credentialsPlaceholder cfg.credentials)}
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${cfg.extraConfig}
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'';
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in {
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###### interface
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options = {
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services.mpd = {
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enable = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether to enable MPD, the music player daemon.
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'';
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};
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startWhenNeeded = mkOption {
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type = types.bool;
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default = false;
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description = ''
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If set, <command>mpd</command> is socket-activated; that
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is, instead of having it permanently running as a daemon,
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systemd will start it on the first incoming connection.
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'';
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};
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musicDirectory = mkOption {
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type = with types; either path (strMatching "(http|https|nfs|smb)://.+");
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default = "${cfg.dataDir}/music";
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defaultText = "\${dataDir}/music";
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description = ''
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The directory or NFS/SMB network share where MPD reads music from. If left
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as the default value this directory will automatically be created before
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the MPD server starts, otherwise the sysadmin is responsible for ensuring
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the directory exists with appropriate ownership and permissions.
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'';
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};
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playlistDirectory = mkOption {
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type = types.path;
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default = "${cfg.dataDir}/playlists";
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defaultText = "\${dataDir}/playlists";
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description = ''
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The directory where MPD stores playlists. If left as the default value
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this directory will automatically be created before the MPD server starts,
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otherwise the sysadmin is responsible for ensuring the directory exists
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with appropriate ownership and permissions.
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'';
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};
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extraConfig = mkOption {
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type = types.lines;
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default = "";
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description = ''
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Extra directives added to to the end of MPD's configuration file,
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mpd.conf. Basic configuration like file location and uid/gid
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is added automatically to the beginning of the file. For available
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options see <literal>man 5 mpd.conf</literal>'.
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'';
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};
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dataDir = mkOption {
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type = types.path;
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default = "/var/lib/${name}";
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description = ''
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The directory where MPD stores its state, tag cache, playlists etc. If
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left as the default value this directory will automatically be created
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before the MPD server starts, otherwise the sysadmin is responsible for
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ensuring the directory exists with appropriate ownership and permissions.
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'';
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};
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user = mkOption {
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type = types.str;
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default = name;
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description = "User account under which MPD runs.";
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};
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group = mkOption {
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type = types.str;
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default = name;
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description = "Group account under which MPD runs.";
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};
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network = {
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listenAddress = mkOption {
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type = types.str;
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default = "127.0.0.1";
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example = "any";
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description = ''
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The address for the daemon to listen on.
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Use <literal>any</literal> to listen on all addresses.
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'';
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};
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port = mkOption {
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type = types.int;
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default = 6600;
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description = ''
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This setting is the TCP port that is desired for the daemon to get assigned
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to.
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'';
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};
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};
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dbFile = mkOption {
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type = types.nullOr types.str;
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default = "${cfg.dataDir}/tag_cache";
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defaultText = "\${dataDir}/tag_cache";
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description = ''
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The path to MPD's database. If set to <literal>null</literal> the
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parameter is omitted from the configuration.
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'';
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};
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credentials = mkOption {
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type = types.listOf (types.submodule {
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options = {
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passwordFile = mkOption {
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type = types.path;
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description = ''
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Path to file containing the password.
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'';
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};
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permissions = let
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perms = ["read" "add" "control" "admin"];
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in mkOption {
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type = types.listOf (types.enum perms);
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default = [ "read" ];
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description = ''
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List of permissions that are granted with this password.
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Permissions can be "${concatStringsSep "\", \"" perms}".
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'';
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};
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};
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});
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description = ''
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Credentials and permissions for accessing the mpd server.
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'';
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default = [];
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example = [
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{passwordFile = "/var/lib/secrets/mpd_readonly_password"; permissions = [ "read" ];}
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{passwordFile = "/var/lib/secrets/mpd_admin_password"; permissions = ["read" "add" "control" "admin"];}
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];
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};
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fluidsynth = mkOption {
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type = types.bool;
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default = false;
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description = ''
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If set, add fluidsynth soundfont and configure the plugin.
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'';
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};
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};
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};
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###### implementation
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config = mkIf cfg.enable {
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systemd.sockets.mpd = mkIf cfg.startWhenNeeded {
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description = "Music Player Daemon Socket";
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wantedBy = [ "sockets.target" ];
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listenStreams = [
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"${optionalString (cfg.network.listenAddress != "any") "${cfg.network.listenAddress}:"}${toString cfg.network.port}"
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];
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socketConfig = {
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Backlog = 5;
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KeepAlive = true;
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PassCredentials = true;
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};
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};
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systemd.services.mpd = {
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after = [ "network.target" "sound.target" ];
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description = "Music Player Daemon";
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wantedBy = optional (!cfg.startWhenNeeded) "multi-user.target";
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serviceConfig = mkMerge [
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{
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User = "${cfg.user}";
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ExecStart = "${pkgs.mpd}/bin/mpd --no-daemon /run/mpd/mpd.conf";
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ExecStartPre = pkgs.writeShellScript "mpd-start-pre" ''
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set -euo pipefail
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install -m 600 ${mpdConf} /run/mpd/mpd.conf
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${optionalString (cfg.credentials != [])
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"${pkgs.replace}/bin/replace-literal -fe ${
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concatStringsSep " -a " (imap0 (i: c: "\"{{password-${toString i}}}\" \"$(cat ${c.passwordFile})\"") cfg.credentials)
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} /run/mpd/mpd.conf"}
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'';
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RuntimeDirectory = "mpd";
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Type = "notify";
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LimitRTPRIO = 50;
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LimitRTTIME = "infinity";
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ProtectSystem = true;
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NoNewPrivileges = true;
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ProtectKernelTunables = true;
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ProtectControlGroups = true;
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ProtectKernelModules = true;
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RestrictAddressFamilies = "AF_INET AF_INET6 AF_UNIX AF_NETLINK";
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RestrictNamespaces = true;
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Restart = "always";
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}
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(mkIf (cfg.dataDir == "/var/lib/${name}") {
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StateDirectory = [ name ];
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})
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(mkIf (cfg.playlistDirectory == "/var/lib/${name}/playlists") {
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StateDirectory = [ name "${name}/playlists" ];
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})
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(mkIf (cfg.musicDirectory == "/var/lib/${name}/music") {
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StateDirectory = [ name "${name}/music" ];
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})
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];
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};
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users.users = optionalAttrs (cfg.user == name) {
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${name} = {
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inherit uid;
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group = cfg.group;
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extraGroups = [ "audio" ];
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description = "Music Player Daemon user";
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home = "${cfg.dataDir}";
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};
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};
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users.groups = optionalAttrs (cfg.group == name) {
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${name}.gid = gid;
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};
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};
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}
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