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