syncthing: Use privileged decorator for actions

Tests:

- Functional tests succeed (noticed intermittent failure)
- Initial setup succeeds
  - User/group are created. /var/lib/syncthing is created with proper user/group
    ownership.
  - In configuration file, authentication notification is disabled
- Syncthing web interface is accessible
  - Authentication related notification is not shown.

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

plinth/modules/syncthing/__init__.py

@@ -1,11 +1,8 @@
 # SPDX-License-Identifier: AGPL-3.0-or-later
-"""
-FreedomBox app to configure Syncthing.
-"""
+"""FreedomBox app to configure Syncthing."""
 
 from django.utils.translation import gettext_lazy as _
 
-from plinth import actions
 from plinth import app as app_module
 from plinth import cfg, frontpage, menu
 from plinth.daemon import Daemon
@@ -17,7 +14,7 @@ from plinth.modules.users.components import UsersAndGroups
 from plinth.package import Packages
 from plinth.utils import format_lazy
 
-from . import manifest
+from . import manifest, privileged
 
 _description = [
     _('Syncthing is an application to synchronize files across multiple '
@@ -106,13 +103,13 @@ class SyncthingApp(app_module.App):
     def setup(self, old_version):
         """Install and configure the app."""
         super().setup(old_version)
-        actions.superuser_run('syncthing', ['setup'])
+        privileged.setup()
         add_user_to_share_group(SYSTEM_USER, SyncthingApp.DAEMON)
 
         if not old_version:
             self.enable()
 
-        actions.superuser_run('syncthing', ['setup-config'])
+        privileged.setup_config()
 
         if old_version == 1 and self.is_enabled():
             self.get_component('firewall-syncthing-ports').enable()

plinth/modules/syncthing/privileged.py

@@ -1,10 +1,6 @@
-#!/usr/bin/python3
 # SPDX-License-Identifier: AGPL-3.0-or-later
-"""
-Configuration helper for Syncthing.
-"""
+"""Configure Syncthing."""
 
-import argparse
 import grp
 import os
 import pwd
@@ -15,24 +11,12 @@ import time
 import augeas
 
 from plinth import action_utils
+from plinth.actions import privileged
 
 DATA_DIR = '/var/lib/syncthing'
 CONF_FILE = DATA_DIR + '/.config/syncthing/config.xml'
 
 
-def parse_arguments():
-    """Return parsed command line arguments as dictionary."""
-    parser = argparse.ArgumentParser()
-    subparsers = parser.add_subparsers(dest='subcommand', help='Sub command')
-
-    subparsers.add_parser('setup', help='Setup Syncthing')
-
-    subparsers.add_parser('setup-config', help='Setup Syncthing configuration')
-
-    subparsers.required = True
-    return parser.parse_args()
-
-
 def augeas_load():
     """Initialize Augeas."""
     aug = augeas.Augeas(flags=augeas.Augeas.NO_LOAD +
@@ -42,8 +26,9 @@ def augeas_load():
     return aug
 
 
-def subcommand_setup(_):
-    """Actions to be performed before installing Syncthing"""
+@privileged
+def setup():
+    """Perform post-install actions for Syncthing."""
     # Create syncthing group if needed.
     try:
         grp.getgrnam('syncthing')
@@ -65,7 +50,8 @@ def subcommand_setup(_):
         shutil.chown(DATA_DIR, user='syncthing', group='syncthing')
 
 
-def subcommand_setup_config(_):
+@privileged
+def setup_config():
     """Make configuration changes."""
     # wait until the configuration file is created by the syncthing daemon
     timeout = 300
@@ -94,16 +80,3 @@ def subcommand_setup_config(_):
 
     if conf_changed:
         action_utils.service_try_restart('syncthing@syncthing')
-
-
-def main():
-    """Parse arguments and perform all duties."""
-    arguments = parse_arguments()
-
-    subcommand = arguments.subcommand.replace('-', '_')
-    subcommand_method = globals()['subcommand_' + subcommand]
-    subcommand_method(arguments)
-
-
-if __name__ == '__main__':
-    main()