.filter(User.username == form_result['perm_user_name']).scalar()

        u2p = self.sa.query(UserToPerm).filter(UserToPerm.user == perm_user).all()

        if len(u2p) != 3:

            raise Exception('Defined: %s should be 3  permissions for default'

                            ' user. This should not happen please verify'

                            ' your database' % len(u2p))

        try:

            #stage 1 change defaults    

            for p in u2p:

                if p.permission.permission_name.startswith('repository.'):

                    p.permission = self.get_permission_by_name(

                                       form_result['default_perm'])

                    self.sa.add(p)

                if p.permission.permission_name.startswith('hg.register.'):

                    p.permission = self.get_permission_by_name(

                                       form_result['default_register'])

                    self.sa.add(p)

                if p.permission.permission_name.startswith('hg.create.'):

                    p.permission = self.get_permission_by_name(

                                        form_result['default_create'])

                    self.sa.add(p)

            #stage 2 update all default permissions for repos if checked

                for r2p in self.sa.query(RepoToPerm)\

                               .filter(RepoToPerm.user == perm_user).all():

                    r2p.permission = self.get_permission_by_name(

                                         form_result['default_perm'])

                    self.sa.add(r2p)

            #stage 3 set anonymous access

            if perm_user.username == 'default':

                perm_user.active = bool(form_result['anonymous'])

                self.sa.add(perm_user)

            self.sa.commit()

        except:

            log.error(traceback.format_exc())

            self.sa.rollback()

            raise