anchor.diff:            echo "exporting VirtualBox VM..."
             mkdir -p $out
             fn="$out/${cfg.vmFileName}"
  -          VBoxManage export "$vmName" --output "$fn"
  +          VBoxManage export "$vmName" --output "$fn" --options manifest
   
             rm -v $diskImage
   
  
positive.code:           export HOME=$PWD
            export PATH=${pkgs.virtualbox}/bin:$PATH
  
            echo "creating VirtualBox pass-through disk wrapper (no copying invovled)..."
            VBoxManage internalcommands createrawvmdk -filename disk.vmdk -rawdisk $diskImage
  
            echo "creating VirtualBox VM..."
  
negative.code:     virtualbox = {
        baseImageSize = mkOption {
          type = types.int;
          default = 50 * 1024;
          description = ''
            The size of the VirtualBox base image in MiB.
          '';
  