searx: Enable backup/restore (no data)

Reviewed-by: James Valleroy <jvalleroy@mailbox.org>

functional_tests/features/searx.feature

@@ -15,7 +15,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
 
-@apps @searx
+@apps @searx @backups
 Feature: Searx Web Search
   Run Searx metasearch engine.
 
@@ -32,3 +32,10 @@ Scenario: Disable searx application
   Given the searx application is enabled
   When I disable the searx application
   Then the searx site should not be available
+
+Scenario: Backup and restore searx
+  Given the searx application is enabled
+  When I create a backup of the searx app data
+  And I export the searx app data backup
+  And I restore the searx app data backup
+  Then the searx site should be available

plinth/modules/searx/__init__.py

@@ -27,7 +27,7 @@ from plinth import action_utils, actions, frontpage
 from plinth.menu import main_menu
 from plinth.modules.users import register_group
 
-from .manifest import clients
+from .manifest import backup, clients
 
 clients = clients
 

plinth/modules/searx/manifest.py

@@ -18,6 +18,7 @@
 from django.utils.translation import ugettext_lazy as _
 
 from plinth.clients import validate
+from plinth.modules.backups.api import validate as validate_backup
 
 clients = validate([{
     'name': _('Searx'),
@@ -26,3 +27,5 @@ clients = validate([{
         'url': '/searx/'
     }]
 }])
+
+backup = validate_backup({})