datetime: Use privileged decorator for actions

Tests:

- Setting timezone shows:
  - In the interface and
  - timedatectl

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

actions/timezone-change

@@ -1,37 +0,0 @@
-#!/usr/bin/python3
-# SPDX-License-Identifier: AGPL-3.0-or-later
-"""
-Set time zones with timedatectl (requires root permission).
-"""
-
-import argparse
-import subprocess
-import sys
-
-
-def parse_arguments():
-    """Return parsed command line arguments as dictionary."""
-    parser = argparse.ArgumentParser()
-    parser.add_argument(
-        'timezone', help='Time zone to set; see "timedatectl list-timezones".')
-    return parser.parse_args()
-
-
-def _set_timezone(arguments):
-    """Set time zone with timedatectl."""
-    try:
-        command = ['timedatectl', 'set-timezone', arguments.timezone]
-        subprocess.run(command, stdout=subprocess.DEVNULL, check=True)
-    except subprocess.CalledProcessError as exception:
-        print('Error setting timezone:', exception, file=sys.stderr)
-        sys.exit(1)
-
-
-def main():
-    """Parse arguments and perform all duties."""
-    arguments = parse_arguments()
-    _set_timezone(arguments)
-
-
-if __name__ == '__main__':
-    main()

plinth/modules/datetime/privileged.py

@@ -0,0 +1,13 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
+"""Set time zone with timedatectl."""
+
+import subprocess
+
+from plinth.actions import privileged
+
+
+@privileged
+def set_timezone(timezone: str):
+    """Set time zone with timedatectl."""
+    command = ['timedatectl', 'set-timezone', timezone]
+    subprocess.run(command, stdout=subprocess.DEVNULL, check=True)

plinth/modules/datetime/views.py

@@ -1,7 +1,5 @@
 # SPDX-License-Identifier: AGPL-3.0-or-later
-"""
-FreedomBox app for configuring date and time.
-"""
+"""FreedomBox app for configuring date and time."""
 
 import logging
 import pathlib
@@ -9,9 +7,9 @@ import pathlib
 from django.contrib import messages
 from django.utils.translation import gettext as _
 
-from plinth import actions
 from plinth.views import AppView
 
+from . import privileged
 from .forms import DateTimeForm
 
 logger = logging.getLogger(__name__)
@@ -19,10 +17,12 @@ logger = logging.getLogger(__name__)
 
 class DateTimeAppView(AppView):
     """Serve configuration page."""
+
     form_class = DateTimeForm
     app_id = 'datetime'
 
     def get_initial(self):
+        """Return the values to fill in the form."""
         status = super().get_initial()
         status['time_zone'] = self.get_current_time_zone()
         return status
@@ -35,14 +35,14 @@ class DateTimeAppView(AppView):
         return time_zone or 'none'
 
     def form_valid(self, form):
+        """Change the timezone."""
         old_status = form.initial
         new_status = form.cleaned_data
 
         if old_status['time_zone'] != new_status['time_zone'] and \
            new_status['time_zone'] != 'none':
             try:
-                actions.superuser_run('timezone-change',
-                                      [new_status['time_zone']])
+                privileged.set_timezone(new_status['time_zone'])
             except Exception as exception:
                 messages.error(
                     self.request,