nixos/alsa: kill sound.enable and friends with fire

Common configuration for headless machines (e.g., Amazon EC2 instances).

Disables [sound](#opt-sound.enable),

[vesa](#opt-boot.vesa), serial consoles,

Disables [vesa](#opt-boot.vesa), serial consoles,

[emergency mode](#opt-systemd.enableEmergencyMode),

[grub splash images](#opt-boot.loader.grub.splashImage)

and configures the kernel to reboot automatically on panic.

[noXlibs](#opt-environment.noXlibs), sets

[](#opt-i18n.supportedLocales) to

only support the user-selected locale,

[disables packages' documentation](#opt-documentation.enable),

and [disables sound](#opt-sound.enable).

and [disables packages' documentation](#opt-documentation.enable).

- `services.roundcube.maxAttachmentSize` will multiply the value set with `1.37` to offset overhead introduced by the base64 encoding applied to attachments.

- The `sound` options have been removed or renamed, as they had a lot of unintended side effects. See [below](#sec-release-24.11-migration-sound) for details.

- The `services.mxisd` module has been removed as both [mxisd](https://github.com/kamax-matrix/mxisd) and [ma1sd](https://github.com/ma1uta/ma1sd) are not maintained any longer.

  Consequently the package `pkgs.ma1sd` has also been removed.

  should be changed to using *runner authentication tokens* by configuring

  {option}`services.gitlab-runner.services.<name>.authenticationTokenConfigFile` instead of the former

  {option}`services.gitlab-runner.services.<name>.registrationConfigFile` option.

## Detailed migration information {#sec-release-24.11-migration}

### `sound` options removal {#sec-release-24.11-migration-sound}

The `sound` options have been largely removed, as they are unnecessary for most modern setups, and cause issues when enabled.

If you set `sound.enable` in your configuration:

  - If you are using Pulseaudio or PipeWire, simply remove that option

  - If you are not using an external sound server, and want volumes to be persisted across shutdowns, set `hardware.alsa.enablePersistence = true` instead

If you set `sound.enableOSSEmulation` in your configuration:

  - Make sure it is still necessary, as very few applications actually use OSS

  - If necessary, set `boot.kernelModules = [ "snd_pcm_oss" ]`

If you set `sound.extraConfig` in your configuration:

  - If you are using another sound server, like Pulseaudio, JACK or PipeWire, migrate your configuration to that

  - If you are not using an external sound server, set `environment.etc."asound.conf".text = yourExtraConfig` instead

If you set `sound.mediaKeys` in your configuration:

  - Preferably switch to handling media keys in your desktop environment/compositor

  - If you want to maintain the exact behavior of the option, use the following snippet

```nix

services.actkbd = let

  volumeStep = "1%";

in {

  enable = true;

  bindings = [

    # "Mute" media key

    { keys = [ 113 ]; events = [ "key" ];       command = "${alsa-utils}/bin/amixer -q set Master toggle"; }

    # "Lower Volume" media key

    { keys = [ 114 ]; events = [ "key" "rep" ]; command = "${alsa-utils}/bin/amixer -q set Master ${volumeStep}- unmute"; }

    # "Raise Volume" media key

    { keys = [ 115 ]; events = [ "key" "rep" ]; command = "${alsa-utils}/bin/amixer -q set Master ${volumeStep}+ unmute"; }

    # "Mic Mute" media key

    { keys = [ 190 ]; events = [ "key" ];       command = "${alsa-utils}/bin/amixer -q set Capture toggle"; }

  ];

};

```

let

  cfg = config.hardware.pulseaudio;

  alsaCfg = config.sound;

  hasZeroconf = let z = cfg.zeroconf; in z.publish.enable || z.discovery.enable;

  # Write an /etc/asound.conf that causes all ALSA applications to

  # be re-routed to the PulseAudio server through ALSA's Pulse

  # plugin.

  alsaConf = writeText "asound.conf" (''

  alsaConf = ''

    pcm_type.pulse {

      libs.native = ${pkgs.alsa-plugins}/lib/alsa-lib/libasound_module_pcm_pulse.so ;

      ${lib.optionalString enable32BitAlsaPlugins

    ctl.!default {

      type pulse

    }

    ${alsaCfg.extraConfig}

  '');

  '';

in {

      environment.systemPackages = [ overriddenPackage ];

      sound.enable = true;

      environment.etc = {

        "asound.conf".source = alsaConf;

        "alsa/conf.d/99-pulseaudio.conf".text = alsaConf;

        "pulse/daemon.conf".source = writeText "daemon.conf"

          (lib.generators.toKeyValue {} cfg.daemon.config);

with lib;

let

  inherit (pkgs) alsa-utils;

  pulseaudioEnabled = config.hardware.pulseaudio.enable;

in

{

  imports = [

    (mkRenamedOptionModule [ "sound" "enableMediaKeys" ] [ "sound" "mediaKeys" "enable" ])

    (mkRemovedOptionModule [ "sound" ] "The option was heavily overloaded and can be removed from most configurations.")

  ];

  ###### interface

  options = {

    sound = {

      enable = mkOption {

  options.hardware.alsa.enablePersistence = mkOption {

    type = types.bool;

    default = false;

    description = ''

          Whether to enable ALSA sound.

        '';

      };

      enableOSSEmulation = mkOption {

        type = types.bool;

        default = false;

        description = ''

          Whether to enable ALSA OSS emulation (with certain cards sound mixing may not work!).

        '';

      };

      extraConfig = mkOption {

        type = types.lines;

        default = "";

        example = ''

          defaults.pcm.!card 3

        '';

        description = ''

          Set addition configuration for system-wide alsa.

        '';

      };

      mediaKeys = {

        enable = mkOption {

          type = types.bool;

          default = false;

          description = ''

            Whether to enable volume and capture control with keyboard media keys.

            You want to leave this disabled if you run a desktop environment

            like KDE, Gnome, Xfce, etc, as those handle such things themselves.

            You might want to enable this if you run a minimalistic desktop

            environment or work from bare linux ttys/framebuffers.

            Enabling this will turn on {option}`services.actkbd`.

      Whether to enable ALSA sound card state saving on shutdown.

      This is generally not necessary if you're using an external sound server.

    '';

  };

        volumeStep = mkOption {

          type = types.str;

          default = "1";

          example = "1%";

          description = ''

            The value by which to increment/decrement volume on media keys.

            See amixer(1) for allowed values.

          '';

        };

      };

    };

  };

  ###### implementation

  config = mkIf config.sound.enable {

    environment.systemPackages = [ alsa-utils ];

    environment.etc = mkIf (!pulseaudioEnabled && config.sound.extraConfig != "")

      { "asound.conf".text = config.sound.extraConfig; };

  config = mkIf config.hardware.alsa.enablePersistence {

    # ALSA provides a udev rule for restoring volume settings.

    services.udev.packages = [ alsa-utils ];

    boot.kernelModules = optional config.sound.enableOSSEmulation "snd_pcm_oss";

    systemd.services.alsa-store =

      { description = "Store Sound Card State";

    systemd.services.alsa-store = {

      description = "Store Sound Card State";

      wantedBy = [ "multi-user.target" ];

        unitConfig.RequiresMountsFor = "/var/lib/alsa";

        unitConfig.ConditionVirtualization = "!systemd-nspawn";

      unitConfig = {

        RequiresMountsFor = "/var/lib/alsa";

        ConditionVirtualization = "!systemd-nspawn";

      };

      serviceConfig = {

        Type = "oneshot";

        RemainAfterExit = true;

        ExecStop = "${alsa-utils}/sbin/alsactl store --ignore";

      };

    };

    services.actkbd = mkIf config.sound.mediaKeys.enable {

      enable = true;

      bindings = [

        # "Mute" media key

        { keys = [ 113 ]; events = [ "key" ];       command = "${alsa-utils}/bin/amixer -q set Master toggle"; }

        # "Lower Volume" media key

        { keys = [ 114 ]; events = [ "key" "rep" ]; command = "${alsa-utils}/bin/amixer -q set Master ${config.sound.mediaKeys.volumeStep}- unmute"; }

        # "Raise Volume" media key

        { keys = [ 115 ]; events = [ "key" "rep" ]; command = "${alsa-utils}/bin/amixer -q set Master ${config.sound.mediaKeys.volumeStep}+ unmute"; }

        # "Mic Mute" media key

        { keys = [ 190 ]; events = [ "key" ];       command = "${alsa-utils}/bin/amixer -q set Capture toggle"; }

      ];

  };

  };

}