29027fd1e1
Using pkgs.lib on the spine of module evaluation is problematic because the pkgs argument depends on the result of module evaluation. To prevent an infinite recursion, pkgs and some of the modules are evaluated twice, which is inefficient. Using ‘with lib’ prevents this problem.
93 lines
2.1 KiB
Nix
93 lines
2.1 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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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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mpdConf = pkgs.writeText "mpd.conf" ''
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music_directory "${cfg.musicDirectory}"
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playlist_directory "${cfg.dataDir}/playlists"
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db_file "${cfg.dataDir}/tag_cache"
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state_file "${cfg.dataDir}/state"
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sticker_file "${cfg.dataDir}/sticker.sql"
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log_file "syslog"
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user "mpd"
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${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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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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musicDirectory = mkOption {
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default = "${cfg.dataDir}/music";
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description = ''
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Extra configuration added to the end of MPD's
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configuration file, mpd.conf.
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'';
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};
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extraConfig = mkOption {
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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.
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'';
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};
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dataDir = mkOption {
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default = "/var/lib/mpd/";
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description = ''
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The directory where MPD stores its state, tag cache,
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playlists etc.
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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.services.mpd = {
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after = [ "network.target" "sound.target" ];
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description = "Music Player Daemon";
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wantedBy = [ "multi-user.target" ];
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path = [ pkgs.mpd ];
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preStart = "mkdir -p ${cfg.dataDir} && chown -R mpd:mpd ${cfg.dataDir}";
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script = "exec mpd --no-daemon ${mpdConf}";
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};
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users.extraUsers.mpd = {
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inherit uid;
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group = "mpd";
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extraGroups = [ "audio" ];
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description = "Music Player Daemon user";
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home = "${cfg.dataDir}";
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};
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users.extraGroups.mpd.gid = gid;
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};
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}
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