Fix flake8 warnings

This commit fixes all warnings created by flake8 by removing unused
imports and variable assignments. Some wrongly indented lines are now
indented correctly.

gnuviechadmin/osusers/apps.py

@@ -18,4 +18,9 @@ class OsusersAppConfig(AppConfig):
     verbose_name = _('Operating System Users and Groups')
 
     def ready(self):
-        import osusers.signals
+        """
+        Takes care of importing the signal handlers of the :py:mod:`osusers`
+        app.
+
+        """
+        import osusers.signals  # NOQA

gnuviechadmin/osusers/models.py

@@ -10,8 +10,6 @@ import logging
 import os
 import six
 
-from celery import group
-
 from django.db import models, transaction
 from django.conf import settings
 from django.core.exceptions import ValidationError
@@ -25,8 +23,6 @@ from model_utils.models import TimeStampedModel
 from passlib.hash import sha512_crypt
 from passlib.utils import generate_password
 
-from taskresults.models import TaskResult
-
 
 _LOGGER = logging.getLogger(__name__)
 

gnuviechadmin/osusers/signals.py

@@ -7,14 +7,11 @@ from __future__ import absolute_import, unicode_literals
 import logging
 
 from django.db.models.signals import (
-    m2m_changed,
     post_delete,
     post_save,
 )
 from django.dispatch import receiver
 
-from celery import chain, group
-
 from fileservertasks.tasks import (
     delete_file_mail_userdir,
     delete_file_sftp_userdir,
@@ -80,11 +77,11 @@ def handle_group_created(sender, instance, created, **kwargs):
 def handle_user_created(sender, instance, created, **kwargs):
     if created:
         chain = create_ldap_user.s(
-                instance.username, instance.uid, instance.group.gid,
-                instance.gecos, instance.homedir, instance.shell, None
-            ) | setup_file_sftp_userdir.s(
-                instance.username
-            ) | setup_file_mail_userdir.s(instance.username)
+            instance.username, instance.uid, instance.group.gid,
+            instance.gecos, instance.homedir, instance.shell, None
+        ) | setup_file_sftp_userdir.s(
+            instance.username
+        ) | setup_file_mail_userdir.s(instance.username)
         taskresult = TaskResult.objects.create_task_result(
             'handle_user_created', chain)
         _LOGGER.info(
@@ -140,10 +137,10 @@ def handle_group_deleted(sender, instance, **kwargs):
 @receiver(post_delete, sender=User)
 def handle_user_deleted(sender, instance, **kwargs):
     chain = delete_file_mail_userdir.s(
-            instance.username
-        ) | delete_file_sftp_userdir.s(
-            instance.username
-        ) | delete_ldap_user.s(instance.username)
+        instance.username
+    ) | delete_file_sftp_userdir.s(
+        instance.username
+    ) | delete_ldap_user.s(instance.username)
     _LOGGER.debug('chain signature %s', chain)
     taskresult = TaskResult.objects.create_task_result(
         'handle_user_deleted', chain)