old_contents: #    Licensed under the Apache License, Version 2.0 (the "License"); you may
  #    not use this file except in compliance with the License. You may obtain
  #    a copy of the License at
  #
  #         http://www.apache.org/licenses/LICENSE-2.0
  #
  #    Unless required by applicable law or agreed to in writing, software
  #    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  #    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
  #    License for the specific language governing permissions and limitations
  #    under the License.
  
  from django.utils.translation import ugettext_lazy as _
  
  import horizon
  
  from openstack_dashboard.api import nova
  from openstack_dashboard.dashboards.admin import dashboard
  
  
  class Aggregates(horizon.Panel):
      name = _("Host Aggregates")
      slug = 'aggregates'
      permissions = ('openstack.services.compute',)
  
      def can_access(self, context):
          # extend basic permission-based check with a check to see whether
          # the Aggregates extension is even enabled in nova
          if not nova.extension_supported('Aggregates', context['request']):
              return False
          return super(Aggregates, self).can_access(context)
  
  
  dashboard.Admin.register(Aggregates)
  
new_contents: #    Licensed under the Apache License, Version 2.0 (the "License"); you may
  #    not use this file except in compliance with the License. You may obtain
  #    a copy of the License at
  #
  #         http://www.apache.org/licenses/LICENSE-2.0
  #
  #    Unless required by applicable law or agreed to in writing, software
  #    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  #    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
  #    License for the specific language governing permissions and limitations
  #    under the License.
  
  from django.utils.translation import ugettext_lazy as _
  
  import horizon
  
  from openstack_dashboard.api import nova
  from openstack_dashboard.dashboards.admin import dashboard
  
  
  class Aggregates(horizon.Panel):
      name = _("Host Aggregates")
      slug = 'aggregates'
      permissions = ('openstack.services.compute',)
  
      def allowed(self, context):
          # extend basic permission-based check with a check to see whether
          # the Aggregates extension is even enabled in nova
          if not nova.extension_supported('Aggregates', context['request']):
              return False
          return super(Aggregates, self).allowed(context)
  
  
  dashboard.Admin.register(Aggregates)
  
subject: Fix Firewalls panel to override the right method