backups: Add a notification to suggest users to enable schedules

Tests performed:

- Ensure that backups module is setup from version zero by deleting entry in DB.
Start FreedomBox. Observe the notification comes up.

- Dismiss button dismiss the notification.

- Go to button takes us to the backups module.

- Incrementing the version number of the backups app does not show the
notification again.

- Starting with old code, the notification show up when FreedomBox is run.
Incrementing the version number of the backups app after that does not show the
notification again.

- Enable a schedule and the notification should be dismissed.

Signed-off-by: Sunil Mohan Adapa <sunil@medhas.org>
Reviewed-by: James Valleroy <jvalleroy@mailbox.org>

plinth/modules/backups/__init__.py

@@ -12,6 +12,7 @@ import re
 import paramiko
 from django.utils.text import get_valid_filename
 from django.utils.translation import ugettext_lazy as _
+from django.utils.translation import ugettext_noop
 
 from plinth import actions
 from plinth import app as app_module
@@ -21,7 +22,7 @@ from . import api
 
 logger = logging.getLogger(__name__)
 
-version = 2
+version = 3
 
 is_essential = True
 
@@ -73,6 +74,10 @@ def setup(helper, old_version=None):
                 ['setup', '--path', repository.RootBorgRepository.PATH])
     helper.call('post', app.enable)
 
+    # First time setup or upgrading from older versions.
+    if old_version <= 2:
+        _show_schedule_setup_notification()
+
 
 def _backup_handler(packet, encryption_passphrase=None):
     """Performs backup operation on packet."""
@@ -181,3 +186,41 @@ def split_path(path):
 
     """
     return re.findall(r'^(.*)@([^/]*):(.*)$', path)[0]
+
+
+def _show_schedule_setup_notification():
+    """Show a notification hinting to setup a remote backup schedule."""
+    from plinth.notification import Notification
+    message = ugettext_noop(
+        'Enable an automatic backup schedule for data safety. Prefer an '
+        'encrypted remote backup location or an extra attached disk.')
+    data = {
+        'app_name': 'translate:' + ugettext_noop('Backups'),
+        'app_icon': 'fa-files-o'
+    }
+    title = ugettext_noop('Enable a Backup Schedule')
+    actions_ = [{
+        'type': 'link',
+        'class': 'primary',
+        'text': ugettext_noop('Go to {app_name}'),
+        'url': 'backups:index'
+    }, {
+        'type': 'dismiss'
+    }]
+    Notification.update_or_create(id='backups-remote-schedule',
+                                  app_id='backups', severity='info',
+                                  title=title, message=message,
+                                  actions=actions_, data=data, group='admin')
+
+
+def on_schedule_save(repository):
+    """Dismiss notification. Called when repository's schedule is updated."""
+    if not repository.schedule.enabled:
+        return
+
+    from plinth.notification import Notification
+    try:
+        note = Notification.get('backups-remote-schedule')
+        note.dismiss()
+    except KeyError:
+        pass

plinth/modules/backups/views.py

@@ -93,6 +93,7 @@ class ScheduleView(SuccessMessageMixin, FormView):
         schedule.unselected_apps = unselected_apps
 
         repository.save()
+        backups.on_schedule_save(repository)
         return super().form_valid(form)