tor: Enable backup/restore

Backup and restore all instances of tor and not just FreedomBox instance.

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

functional_tests/features/tor.feature

@@ -52,6 +52,23 @@ Scenario: Set download software packages over tor
   When I enable download software packages over tor
   Then download software packages over tor should be enabled
 
+# TODO: Test more thoroughly by checking same hidden service is restored and by
+# actually connecting using Tor.
+Scenario: Backup and restore tor
+  Given the tor application is enabled
+  And tor relay is enabled
+  And tor bridge relay is enabled
+  And tor hidden services are enabled
+  When I create a backup of the tor app data
+  And I disable tor relay
+  And I disable tor hidden services
+  And I export the tor app data backup
+  And I restore the tor app data backup
+  Then the tor service should be running
+  And tor relay should be enabled
+  And tor bridge relay should be enabled
+  And tor hidden services should be enabled
+
 Scenario: Disable tor application
   Given the tor application is enabled
   When I disable the tor application

plinth/modules/tor/__init__.py

@@ -29,7 +29,7 @@ from plinth.modules.names import SERVICES
 from plinth.signals import domain_added, domain_removed
 
 from . import utils
-from .manifest import clients
+from .manifest import backup, clients
 
 version = 2
 

plinth/modules/tor/manifest.py

@@ -18,6 +18,7 @@
 from django.utils.translation import ugettext_lazy as _
 
 from plinth.clients import store_url, validate
+from plinth.modules.backups.api import validate as validate_backup
 
 _orbot_package_id = 'org.torproject.android'
 _tor_browser_download_url = \
@@ -54,3 +55,13 @@ clients = validate([{
         'url': store_url('f-droid', _orbot_package_id)
     }]
 }])
+
+backup = validate_backup({
+    'config': {
+        'directories': ['/etc/tor/']
+    },
+    'secrets': {
+        'directories': ['/var/lib/tor/', '/var/lib/tor-instances/']
+    },
+    'services': ['tor@service']
+})