anchor.diff:            export HOME=$PWD
             export PATH=${pkgs.virtualbox}/bin:$PATH
   
  -          echo "creating VirtualBox pass-through disk wrapper (no copying invovled)..."
  +          echo "creating VirtualBox pass-through disk wrapper (no copying involved)..."
             VBoxManage internalcommands createrawvmdk -filename disk.vmdk -rawdisk $diskImage
   
             echo "creating VirtualBox VM..."
  
positive.code:     virtualbox = {
        baseImageSize = mkOption {
          type = types.int;
          default = 10 * 1024;
          description = ''
            The size of the VirtualBox base image in MiB.
          '';
  
negative.code:           echo "exporting VirtualBox VM..."
            mkdir -p $out
            fn="$out/${cfg.vmFileName}"
            VBoxManage export "$vmName" --output "$fn" --options manifest
  
            rm -v $diskImage
  
  