92 lines
1.7 KiB
Nix
92 lines
1.7 KiB
Nix
# ALSA sound support.
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{pkgs, config}:
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###### interface
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let
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inherit (pkgs.lib) mkOption;
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options = {
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sound = {
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enable = mkOption {
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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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merge = pkgs.lib.mergeEnableOption;
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};
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};
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};
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in
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###### implementation
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let
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inherit (pkgs.lib) mkIf;
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# dangerous !
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modprobe = config.system.sbin.modprobe;
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inherit (pkgs) alsaUtils;
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soundState = "/var/lib/alsa/asound.state";
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# Alsalib seems to require the existence of this group, even if it's
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# not used (e.g., doesn't own any devices).
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group = {
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name = "audio";
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gid = (import ../system/ids.nix).gids.audio;
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};
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job = {
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name = "alsa";
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job = ''
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start on udev
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stop on shutdown
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start script
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mkdir -m 0755 -p $(dirname ${soundState})
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# Load some additional modules.
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for mod in snd_pcm_oss; do
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${modprobe}/sbin/modprobe $mod || true
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done
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# Restore the sound state.
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${alsaUtils}/sbin/alsactl -f ${soundState} restore
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end script
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respawn sleep 1000000 # !!! hack
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stop script
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# Save the sound state.
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${alsaUtils}/sbin/alsactl -f ${soundState} store
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end script
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'';
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};
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in
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mkIf config.sound.enable {
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require = [
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(import ../upstart-jobs/default.nix) # config.services.extraJobs
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# (import ../system/user.nix) # users.*
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# (import ?) # config.environment.extraPackages
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options
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];
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environment = {
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extraPackages = [alsaUtils];
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};
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users = {
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extraGroups = [group];
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};
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services = {
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extraJobs = [job];
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};
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}
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