@abc.abstractmethod<EOL><INDENT>def get_current_packages(self):<DEDENT>
return<EOL>
Gets the packages to install to bring the site up to date.

        :return: the next packages to install
        :rtype: ``osid.installation.PackageList``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

        *compliance: mandatory -- This method must be implemented.*