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.
70 lines
1.4 KiB
Nix
70 lines
1.4 KiB
Nix
# ALSA sound support.
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{ config, lib, pkgs, ... }:
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with lib;
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let
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inherit (pkgs) alsaUtils;
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soundState = "/var/lib/alsa/asound.state";
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in
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{
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###### interface
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options = {
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sound = {
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enable = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whether to enable ALSA sound.
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'';
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};
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enableOSSEmulation = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whether to enable ALSA OSS emulation (with certain cards sound mixing may not work!).
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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 config.sound.enable {
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environment.systemPackages = [ alsaUtils ];
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# ALSA provides a udev rule for restoring volume settings.
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services.udev.packages = [ alsaUtils ];
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boot.kernelModules = optional config.sound.enableOSSEmulation "snd_pcm_oss";
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systemd.services."alsa-store" =
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{ description = "Store Sound Card State";
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wantedBy = [ "multi-user.target" ];
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unitConfig.RequiresMountsFor = "/var/lib/alsa";
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unitConfig.ConditionVirtualization = "!systemd-nspawn";
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serviceConfig = {
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Type = "oneshot";
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RemainAfterExit = true;
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ExecStart = "${pkgs.coreutils}/bin/mkdir -p /var/lib/alsa";
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ExecStop = "${alsaUtils}/sbin/alsactl store --ignore";
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};
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};
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};
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}
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