anchor.diff:      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
  
positive.code:   nixosTarball = makeTarball "nixos.tar.bz2" ../..;
  
  
    # Put Services in a tarball.
    servicesTarball = makeTarball "services.tar.bz2" services;
  
  
    # Put Nixpkgs in a tarball.
    nixpkgsTarball = makeTarball "nixpkgs.tar.bz2" nixpkgs;
  
  
negative.code:     };
      
      installer = {
        nixpkgsURL = http://nixos.org/releases/nixpkgs/channels/nixpkgs-unstable;
      };
  
      security = {
  