anchor.diff:                tar xjf /install/nixos.tar.bz2 -C /etc/nixos/nixos
                 mkdir -p /etc/nixos/nixpkgs
                 tar xjf /install/nixpkgs.tar.bz2 -C /etc/nixos/nixpkgs
  +              mkdir -p /etc/nixos/services
  +              tar xjf /install/services.tar.bz2 -C /etc/nixos/services
                 chown -R root.root /etc/nixos
               end script
             ";
  
positive.code:   nixosTarball = makeTarball "nixos.tar.bz2" ../..;
  
  
    # Put Nixpkgs in a tarball.
    nixpkgsTarball = makeTarball "nixpkgs.tar.bz2" nixpkgs;
  
  
negative.code:     else "nixos-${builtins.readFile ../../VERSION}"
  , compressImage ? false
  , nixpkgs ? ../../../nixpkgs
  , services ? ../../../services
  # This option allows easy building of Rescue CD with 
  # modified package set / driver set / anything.
  # For easier maitenance, let overrider know the current
  