anchor.diff:      cat >> run-kvm.sh << EOF
       #!/bin/sh -e
   
  -    # don't ask me why I have to remove the socket.. If I don't it won't be
  -    # reused by kvm_qemu!
  -    rm $SOCKET_NAME || true
       exec qemu-system-x86_64 -m 512 \
           -no-kvm-irqchip \
           -net nic,model=virtio -net user -smb /nix \
           -hda image \
           -redir tcp:''${SOCKET_NAME/.socket/}::22 \
  +        $KVM_OPTIONS \
           "\$@"
       EOF
       chmod +x run-kvm.sh
  
positive.code: 
    # TODO test both: copyKernels = true and false. true doesn't work ?
  
  in
  
  rec {
  
negative.code:    To prevent this make these paths point to another location:
     nixosTarball = makeTarball "nixos.tar.bz2" (cleanSource ../../..);
     nixpkgsTarball = makeTarball "nixpkgs.tar.bz2" (cleanSource pkgs.path);
  
  */
  
  