nixos-config/modules/backscrub/default.nix

{
  pkgs,
  config,
  lib,
  ...
}:
with lib; let
  cfg = config.eboskma.backscrub;
in {
  options.eboskma.backscrub = {
    enable = mkEnableOption "enable v4l2loopback kernel module";
  };

  config = mkIf (cfg.enable) {
    boot.extraModulePackages = [config.boot.kernelPackages.v4l2loopback];
    # Register a v4l2loopback device at boot
    boot.kernelModules = [
      "v4l2loopback"
    ];

    boot.extraModprobeConfig = ''
      options v4l2loopback max_buffers=2
      options v4l2loopback exclusive_caps=1
      options v4l2loopback video_nr=10
      options v4l2loopback card_label="VirtualCam"
    '';

    environment.systemPackages = with pkgs; [backscrub];
  };
}