nixpkgs/nixos/modules/services/audio/mpd.nix

258 lines
7.7 KiB
Nix

{ 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" ''
# This file was automatically generated by NixOS. Edit mpd's configuration
# via NixOS' configuration.nix, as this file will be rewritten upon mpd's
# restart.
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"
${optionalString (cfg.network.listenAddress != "any") ''bind_to_address "${cfg.network.listenAddress}"''}
${optionalString (cfg.network.port != 6600) ''port "${toString cfg.network.port}"''}
${optionalString (cfg.fluidsynth) ''
decoder {
plugin "fluidsynth"
soundfont "${pkgs.soundfont-fluid}/share/soundfonts/FluidR3_GM2-2.sf2"
}
''}
${cfg.extraConfig}
'';
in {
###### interface
options = {
services.mpd = {
enable = mkOption {
type = types.bool;
default = false;
description = ''
Whether to enable MPD, the music player daemon.
'';
};
startWhenNeeded = mkOption {
type = types.bool;
default = false;
description = ''
If set, <command>mpd</command> is socket-activated; that
is, instead of having it permanently running as a daemon,
systemd will start it on the first incoming connection.
'';
};
musicDirectory = mkOption {
type = with types; either path (strMatching "(http|https|nfs|smb)://.+");
default = "${cfg.dataDir}/music";
defaultText = ''''${dataDir}/music'';
description = ''
The directory or NFS/SMB network share where MPD reads music from. If left
as the default value this directory will automatically be created before
the MPD server starts, otherwise the sysadmin is responsible for ensuring
the directory exists with appropriate ownership and permissions.
'';
};
playlistDirectory = mkOption {
type = types.path;
default = "${cfg.dataDir}/playlists";
defaultText = ''''${dataDir}/playlists'';
description = ''
The directory where MPD stores playlists. If left as the default value
this directory will automatically be created before the MPD server starts,
otherwise the sysadmin is responsible for ensuring the directory exists
with appropriate ownership and permissions.
'';
};
extraConfig = mkOption {
type = types.lines;
default = "";
description = ''
Extra directives added to to the end of MPD's configuration file,
mpd.conf. Basic configuration like file location and uid/gid
is added automatically to the beginning of the file. For available
options see <literal>man 5 mpd.conf</literal>'.
'';
};
dataDir = mkOption {
type = types.path;
default = "/var/lib/${name}";
description = ''
The directory where MPD stores its state, tag cache, playlists etc. If
left as the default value this directory will automatically be created
before the MPD server starts, otherwise the sysadmin is responsible for
ensuring the directory exists with appropriate ownership and permissions.
'';
};
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 <literal>any</literal> 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 <literal>null</literal> the
parameter is omitted from the configuration.
'';
};
credentialsFile = mkOption {
type = types.path;
description = ''
Path to a file to be merged with the settings during the service startup.
Useful to merge a file which is better kept out of the Nix store
because it contains sensible data like MPD's password. Example may look like this:
<literal>password "myMpdPassword@read,add,control,admin"</literal>
'';
default = "/dev/null";
example = "/var/lib/secrets/mpd.conf";
};
fluidsynth = mkOption {
type = types.bool;
default = false;
description = ''
If set, add fluidsynth soundfont and configure the plugin.
'';
};
};
};
###### 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}:"}${toString cfg.network.port}"
];
socketConfig = {
Backlog = 5;
KeepAlive = true;
PassCredentials = true;
};
};
systemd.services.mpd = {
after = [ "network.target" "sound.target" ];
description = "Music Player Daemon";
wantedBy = optional (!cfg.startWhenNeeded) "multi-user.target";
serviceConfig = mkMerge [
{
User = "${cfg.user}";
ExecStart = "${pkgs.mpd}/bin/mpd --no-daemon /etc/mpd.conf";
ExecStartPre = pkgs.writeScript "mpd-start-pre" ''
#!${pkgs.runtimeShell}
set -euo pipefail
cat ${mpdConf} ${cfg.credentialsFile} > /etc/mpd.conf
'';
Type = "notify";
LimitRTPRIO = 50;
LimitRTTIME = "infinity";
ProtectSystem = true;
NoNewPrivileges = true;
ProtectKernelTunables = true;
ProtectControlGroups = true;
ProtectKernelModules = true;
RestrictAddressFamilies = "AF_INET AF_INET6 AF_UNIX AF_NETLINK";
RestrictNamespaces = true;
Restart = "always";
}
(mkIf (cfg.dataDir == "/var/lib/${name}") {
StateDirectory = [ name ];
})
(mkIf (cfg.playlistDirectory == "/var/lib/${name}/playlists") {
StateDirectory = [ name "${name}/playlists" ];
})
(mkIf (cfg.musicDirectory == "/var/lib/${name}/music") {
StateDirectory = [ name "${name}/music" ];
})
];
};
environment.etc."mpd.conf" = {
mode = "0640";
group = cfg.group;
user = cfg.user;
# To be modified by the service' ExecStartPre
text = ''
'';
};
users.users = optionalAttrs (cfg.user == name) {
${name} = {
inherit uid;
group = cfg.group;
extraGroups = [ "audio" ];
description = "Music Player Daemon user";
home = "${cfg.dataDir}";
};
};
users.groups = optionalAttrs (cfg.group == name) {
${name}.gid = gid;
};
};
}