anchor.diff:      ''
         --nodaemon
         --verbose
  +      ${cfg.extraConfig}
       '';
   
   in
  
positive.code:     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";
          }
        ];
  
  
negative.code:           '';
        };
  
      virtualisation.nova.extraConfig = 
        mkOption {
          default = false;
          description =
            ''
              Additional text appended to <filename>nova.conf</filename>,
              the main Nova configuration file.
            '';
        };
  
    };
  
  
  