anchor.diff:      environment.systemPackages = [ nova pkgs.euca2ools pkgs.novaclient ];
   
       environment.etc =
  -      [ # The Paste configuration file for nova-api.
  -        { source = "${nova}/etc/nova/nova-api.conf";
  -          target = "nova/nova-api.conf";
  +      [ { source = novaConf;
  +          target = "nova/nova.conf";
           }
         ];
   
  
positive.code:     ''
        --nodaemon
        --verbose
      '';
  
  in
  
negative.code:           '';
        };
  
      virtualisation.nova.extraConfig = 
        mkOption {
          default = false;
          description =
            ''
              Additional text appended to <filename>nova.conf</filename>,
              the main Nova configuration file.
            '';
        };
  
    };
  
  
  