mirror of
https://github.com/NixOS/nixpkgs.git
synced 2026-09-30 03:39:59 +00:00
nixos/alsa: reintroduce hardware.alsa.enablePersistence
This commit is contained in:
rnhmjoj
@@ -86,9 +86,7 @@ in
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[ "sound" "enableOSSEmulation" ]
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[ "hardware" "alsa" "enableOSSEmulation" ]
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)
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(lib.mkRenamedOptionModule
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[ "sound" "extraConfig" ]
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[ "hardware" "alsa" "config" ])
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(lib.mkRenamedOptionModule [ "sound" "extraConfig" ] [ "hardware" "alsa" "config" ])
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];
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options.hardware.alsa = {
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@@ -191,7 +189,7 @@ in
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};
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})
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);
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default = {};
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default = { };
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example = lib.literalExpression ''
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{
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firefox = { device = "front"; maxVolume = -25.0; };
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@@ -286,154 +284,176 @@ in
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};
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config = lib.mkIf cfg.enable {
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# Disable sound servers enabled by default and,
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# if the user enabled one manually, cause a conflict.
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services.pipewire.enable = false;
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hardware.pulseaudio.enable = false;
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hardware.alsa.config =
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let
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conf = [
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''
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pcm.!default fromenv
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# Read the capture and playback device from
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# the ALSA_AUDIO_IN, ALSA_AUDIO_OUT variables
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pcm.fromenv {
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type asym
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playback.pcm {
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type plug
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slave.pcm {
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@func getenv
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vars [ ALSA_AUDIO_OUT ]
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default pcm.sysdefault
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}
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}
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capture.pcm {
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type plug
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slave.pcm {
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@func getenv
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vars [ ALSA_AUDIO_IN ]
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default pcm.sysdefault
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}
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}
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}
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''
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(lib.optional cfg.enableRecorder ''
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pcm.!default "splitter:fromenv,recorder"
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# Send audio to two stereo devices
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pcm.splitter {
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@args [ A B ]
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@args.A.type string
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@args.B.type string
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type asym
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playback.pcm {
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type plug
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route_policy "duplicate"
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slave.pcm {
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type multi
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slaves.a.pcm $A
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slaves.b.pcm $B
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slaves.a.channels 2
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slaves.b.channels 2
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bindings [
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{ slave a channel 0 }
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{ slave a channel 1 }
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{ slave b channel 0 }
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{ slave b channel 1 }
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]
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}
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}
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capture.pcm $A
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}
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# Device which records and plays back audio
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pcm.recorder {
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type asym
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capture.pcm {
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type dsnoop
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ipc_key 9165218
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ipc_perm 0666
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slave.pcm "hw:loopback,1,0"
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slave.period_size 1024
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slave.buffer_size 8192
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}
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playback.pcm {
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type dmix
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ipc_key 6181923
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ipc_perm 0666
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slave.pcm "hw:loopback,0,0"
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slave.period_size 1024
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slave.buffer_size 8192
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}
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}
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'')
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(lib.mapAttrsToList mkControl cfg.controls)
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(lib.mapAttrsToList (n: v: "pcm.${n} ${quote v}") cfg.deviceAliases)
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];
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in
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lib.mkBefore (lib.concatStringsSep "\n" (lib.flatten conf));
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hardware.alsa.cardAliases = lib.mkIf cfg.enableRecorder {
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loopback.driver = "snd_aloop";
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loopback.id = 2;
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};
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# Set default PCM devices
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environment.sessionVariables = defaultDeviceVars;
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systemd.globalEnvironment = defaultDeviceVars;
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environment.etc."asound.conf".text = cfg.config;
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boot.kernelModules =
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[ ]
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++ lib.optionals cfg.enableOSSEmulation [ "snd_pcm_oss" "snd_mixer_oss" ]
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++ lib.optionals cfg.enableRecorder [ "snd_aloop" ];
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# Assign names to the sound cards
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boot.extraModprobeConfig = lib.concatStringsSep "\n" cardsConfig;
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# Provide alsamixer, aplay, arecord, etc.
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environment.systemPackages = [ pkgs.alsa-utils ];
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# Install udev rules for restoring card settings on boot
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services.udev.extraRules = ''
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ACTION=="add", SUBSYSTEM=="sound", KERNEL=="controlC*", KERNELS!="card*", GOTO="alsa_restore_go"
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GOTO="alsa_restore_end"
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LABEL="alsa_restore_go"
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TEST!="/etc/alsa/state-daemon.conf", RUN+="${alsactl} restore -gU $attr{device/number}"
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TEST=="/etc/alsa/state-daemon.conf", RUN+="${alsactl} nrestore -gU $attr{device/number}"
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LABEL="alsa_restore_end"
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options.hardware.alsa.enablePersistence = lib.mkOption {
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type = lib.types.bool;
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defaultText = lib.literalExpression "config.hardware.alsa.enable";
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default = config.hardware.alsa.enable;
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description = ''
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Whether to enable ALSA sound card state saving on shutdown.
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This is generally not necessary if you're using an external sound server.
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'';
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# Service to store/restore the sound card settings
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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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restartIfChanged = false;
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unitConfig = {
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RequiresMountsFor = "/var/lib/alsa";
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ConditionVirtualization = "!systemd-nspawn";
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};
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serviceConfig = {
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Type = "oneshot";
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RemainAfterExit = true;
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StateDirectory = "alsa";
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# Note: the service should never be restated, otherwise any
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# setting changed between the last `store` and now will be lost.
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# To prevent NixOS from starting it in case it has failed we
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# expand the exit codes considered successful
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SuccessExitStatus = [ 0 99 ];
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ExecStart = "${alsactl} restore -gU";
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ExecStop = "${alsactl} store -gU";
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};
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};
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};
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config = lib.mkMerge [
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(lib.mkIf cfg.enable {
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# Disable sound servers enabled by default and,
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# if the user enabled one manually, cause a conflict.
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services.pipewire.enable = false;
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services.pulseaudio.enable = false;
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hardware.alsa.config =
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let
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conf = [
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''
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pcm.!default fromenv
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# Read the capture and playback device from
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# the ALSA_AUDIO_IN, ALSA_AUDIO_OUT variables
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pcm.fromenv {
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type asym
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playback.pcm {
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type plug
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slave.pcm {
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@func getenv
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vars [ ALSA_AUDIO_OUT ]
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default pcm.sysdefault
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}
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}
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capture.pcm {
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type plug
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slave.pcm {
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@func getenv
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vars [ ALSA_AUDIO_IN ]
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default pcm.sysdefault
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}
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}
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}
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''
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(lib.optional cfg.enableRecorder ''
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pcm.!default "splitter:fromenv,recorder"
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# Send audio to two stereo devices
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pcm.splitter {
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@args [ A B ]
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@args.A.type string
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@args.B.type string
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type asym
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playback.pcm {
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type plug
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route_policy "duplicate"
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slave.pcm {
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type multi
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slaves.a.pcm $A
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slaves.b.pcm $B
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slaves.a.channels 2
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slaves.b.channels 2
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bindings [
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{ slave a channel 0 }
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{ slave a channel 1 }
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{ slave b channel 0 }
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{ slave b channel 1 }
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]
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}
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}
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capture.pcm $A
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}
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# Device which records and plays back audio
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pcm.recorder {
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type asym
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capture.pcm {
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type dsnoop
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ipc_key 9165218
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ipc_perm 0666
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slave.pcm "hw:loopback,1,0"
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slave.period_size 1024
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slave.buffer_size 8192
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}
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playback.pcm {
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type dmix
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ipc_key 6181923
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ipc_perm 0666
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slave.pcm "hw:loopback,0,0"
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slave.period_size 1024
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slave.buffer_size 8192
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}
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}
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'')
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(lib.mapAttrsToList mkControl cfg.controls)
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(lib.mapAttrsToList (n: v: "pcm.${n} ${quote v}") cfg.deviceAliases)
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];
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in
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lib.mkBefore (lib.concatStringsSep "\n" (lib.flatten conf));
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hardware.alsa.cardAliases = lib.mkIf cfg.enableRecorder {
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loopback.driver = "snd_aloop";
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loopback.id = 2;
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};
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# Set default PCM devices
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environment.sessionVariables = defaultDeviceVars;
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systemd.globalEnvironment = defaultDeviceVars;
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environment.etc."asound.conf".text = cfg.config;
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boot.kernelModules =
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[ ]
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++ lib.optionals cfg.enableOSSEmulation [
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"snd_pcm_oss"
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"snd_mixer_oss"
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]
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++ lib.optionals cfg.enableRecorder [ "snd_aloop" ];
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# Assign names to the sound cards
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boot.extraModprobeConfig = lib.concatStringsSep "\n" cardsConfig;
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# Provide alsamixer, aplay, arecord, etc.
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environment.systemPackages = [ pkgs.alsa-utils ];
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})
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(lib.mkIf config.hardware.alsa.enablePersistence {
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# Install udev rules for restoring card settings on boot
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services.udev.extraRules = ''
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ACTION=="add", SUBSYSTEM=="sound", KERNEL=="controlC*", KERNELS!="card*", GOTO="alsa_restore_go"
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GOTO="alsa_restore_end"
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LABEL="alsa_restore_go"
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TEST!="/etc/alsa/state-daemon.conf", RUN+="${alsactl} restore -gU $attr{device/number}"
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TEST=="/etc/alsa/state-daemon.conf", RUN+="${alsactl} nrestore -gU $attr{device/number}"
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LABEL="alsa_restore_end"
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'';
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# Service to store/restore the sound card settings
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systemd.services.alsa-store = {
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description = "Store Sound Card State";
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wantedBy = [ "multi-user.target" ];
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restartIfChanged = false;
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unitConfig = {
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RequiresMountsFor = "/var/lib/alsa";
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ConditionVirtualization = "!systemd-nspawn";
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};
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serviceConfig = {
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Type = "oneshot";
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RemainAfterExit = true;
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StateDirectory = "alsa";
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# Note: the service should never be restated, otherwise any
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# setting changed between the last `store` and now will be lost.
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# To prevent NixOS from starting it in case it has failed we
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# expand the exit codes considered successful
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SuccessExitStatus = [
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0
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99
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];
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ExecStart = "${alsactl} restore -gU";
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ExecStop = "${alsactl} store -gU";
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};
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};
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})
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];
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meta.maintainers = with lib.maintainers; [ rnhmjoj ];
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}
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