upgrades: Use internal scheduler instead of systemd timer

- For setting up backports repositories. Using an internal scheduler is easy to
maintain in the long run.

- Run it more frequently when in developer mode.

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

plinth/modules/upgrades/__init__.py

@@ -9,7 +9,7 @@ from django.utils.translation import ugettext_noop
 import plinth
 from plinth import actions
 from plinth import app as app_module
-from plinth import menu
+from plinth import cfg, glib, menu
 
 from .manifest import backup  # noqa, pylint: disable=unused-import
 
@@ -46,6 +46,11 @@ class UpgradesApp(app_module.App):
 
         self._show_new_release_notification()
 
+        # Check every day for setting up apt backport sources, every 3 minutes
+        # in debug mode.
+        interval = 180 if cfg.develop else 24 * 3600
+        glib.schedule(interval, _setup_repositories)
+
     def _show_new_release_notification(self):
         """When upgraded to new release, show a notification."""
         from plinth.notification import Notification
@@ -95,6 +100,10 @@ def setup(helper, old_version=None):
     # increment.
     helper.call('post', actions.superuser_run, 'upgrades', ['setup'])
 
+    # Try to setup apt repositories, if needed, if possible, on first install
+    # and on version increment.
+    helper.call('post', _setup_repositories, None)
+
 
 def is_enabled():
     """Return whether the module is enabled."""
@@ -110,3 +119,8 @@ def enable():
 def disable():
     """Disable the module."""
     actions.superuser_run('upgrades', ['disable-auto'])
+
+
+def _setup_repositories(data):
+    """Setup apt backport repositories."""
+    actions.superuser_run('upgrades', ['setup-repositories'])

plinth/modules/upgrades/data/lib/systemd/system/freedombox-setup-repositories.service

@@ -1,19 +0,0 @@
-# SPDX-License-Identifier: AGPL-3.0-or-later
-
-[Unit]
-Description=FreedomBox: Setup software repositories
-
-[Service]
-ExecStart=/usr/share/plinth/actions/upgrades setup-repositories
-Type=oneshot
-LockPersonality=yes
-PrivateDevices=yes
-PrivateTmp=yes
-ProtectControlGroups=yes
-ProtectKernelLogs=yes
-ProtectKernelModules=yes
-ProtectKernelTunables=yes
-ProtectSystem=yes
-RestrictAddressFamilies=AF_UNIX AF_INET AF_INET6
-RestrictRealtime=yes
-SystemCallArchitectures=native

plinth/modules/upgrades/data/lib/systemd/system/freedombox-setup-repositories.timer

@@ -1,12 +0,0 @@
-# SPDX-License-Identifier: AGPL-3.0-or-later
-
-[Unit]
-Description=FreedomBox: Daily check for setting up software repositories
-
-[Timer]
-OnCalendar=daily
-AccuracySec=12h
-Persistent=true
-
-[Install]
-WantedBy=multi-user.target