anchor.diff:  
     src = fetchgit {
       url = https://github.com/NixOS/nixops;
  -    rev = "cefcd9bae9a4d3bac83f188460619d18972321a8";
  -    sha256 = "1jwkbnfwics2j0m6mr75rz914vg0z46d2xv0z1717c1ac5rki0l2";
  +    rev = "9a05ebc332701247fa99fbf6d1215d48e08f3edd";
  +    sha256 = "17vxr51wpdd5dnasiaafga3a6ddhxyrwgr0yllczxj6bq0n5skp2";
     };
   
     buildInputs = [ /* libxslt */ pythonPackages.nose pythonPackages.coverage ];
  
positive.code: { lib, pythonPackages, fetchgit, libxslt, docbook5_xsl, openssh }:
  
  let
  
    # Use this until the patches are upstreamed.
    # Warning: will be rebased at will
    libcloud = lib.overrideDerivation pythonPackages.libcloud ( args: {
      src = fetchgit {
        url = https://github.com/Phreedom/libcloud.git;
        rev = "784427f549829a00d551e3468184a708420ad1ec";
        sha256 = "fd0e092b39fa1fde6a8847e6dc69855d30c2dad9e95ee0373297658ff53edf8a";
      };
  
      preConfigure = "cp libcloud/test/secrets.py-dist libcloud/test/secrets.py";
    });
  
  in
  
  pythonPackages.buildPythonPackage rec {
    name = "nixops-1.3pre-cefcd9ba";
  
negative.code:     [ pythonPackages.prettytable
        pythonPackages.boto
        pythonPackages.hetzner
        pythonPackages.libcloud
        pythonPackages.sqlite3
      ];
  
  