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
      kernelModules = [
        "v4l2loopback"
      ];

      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 ];
  };
}