Add command 'initialize' to init a few defaults

Currently creates sikadmin group and perms

webapp/management/commands/initialize.py

@@ -0,0 +1,34 @@
+from django.core.management.base import BaseCommand, CommandError
+
+from django.contrib.auth.models import Group, Permission
+from django.contrib.contenttypes.models import ContentType
+
+class Command(BaseCommand):
+    '''
+    Creates initial skeleton for the webapp.
+    This command MUST do nothing if already run.
+    '''
+
+    def handle(self, *args, **options):
+        
+        self.stdout.write("Creating sikadmin group")
+        sikadmin_group, created = Group.objects.get_or_create(name="sikadmin")
+        if not created:
+            self.stdout.write("The group 'sikadmin' already existed and was not therefore created")
+
+        self.stdout.write("Creating sikadmin permission")
+        group_ctype = ContentType.objects.get_for_model(Group)  # TODO Use some sikadmin native model when such exists
+        sikadmin_permission, created = Permission.objects.get_or_create(codename='sikadmin', 
+                                                                        content_type=group_ctype, 
+                                                                        name='SIK Admin')
+        if not created:
+            self.stdout.write("The permission 'sikadmin' already existed and was not therefore created")
+
+        self.stdout.write("Giving sikadmin group permission to sikadmin")
+        if sikadmin_group.permissions.filter(id=sikadmin_permission.id).exists():
+            self.stdout.write("Permission already existed. skipping...")
+        else:
+            sikadmin_group.permissions.add(sikadmin_permission)
+
+        self.stdout.write("Initialization successful")
+