anchor.diff:  
       sudo nixos-container start vpn
       sudo nixos-container run vpn -- protonvpn c -f
  +
       sudo nixos-container run vpn -- start_xpra $@ &
   
       while ! ${pkgs.socat}/bin/socat -u OPEN:/dev/null UNIX-CONNECT:/run/xpra-vpn/vpn-0
  
positive.code:       sleep 1
      done
  
      ${xpra}/bin/xpra attach --opengl=yes --video-encoders=rgb24 socket:///run/xpra-vpn/vpn-0
  
      sudo nixos-container run vpn -- protonvpn d
    '';
  in
  {
  
negative.code:     privateNetwork = true;
      hostAddress = "192.168.10.10";
      localAddress = "192.168.10.11";
      allowedDevices = [
        { modifier = "rw"; node = "/dev/vga_arbiter"; }
      ];
  