Allow to disable plugins system-wide

src/pretix/base/plugins.py

@@ -2,6 +2,7 @@ from enum import Enum
 from typing import List
 
 from django.apps import apps
+from django.conf import settings
 
 
 class PluginType(Enum):
@@ -26,5 +27,7 @@ def get_all_plugins() -> List[type]:
             meta = app.PretixPluginMeta
             meta.module = app.name
             meta.app = app
+            if app.name in settings.PRETIX_PLUGINS_EXCLUDE:
+                continue
             plugins.append(meta)
     return plugins

src/pretix/base/signals.py

@@ -42,7 +42,8 @@ class EventPluginSignal(django.dispatch.Signal):
                 searchpath, _ = searchpath.rsplit(".", 1)
 
         # Only fire receivers from active plugins and core modules
-        if core_module or (sender and app and app.name in sender.get_plugins()):
+        excluded = settings.PRETIX_PLUGINS_EXCLUDE
+        if core_module or (sender and app and app.name in sender.get_plugins() and app.name not in excluded):
             if not hasattr(app, 'compatibility_errors') or not app.compatibility_errors:
                 return True
         return False

src/pretix/settings.py

@@ -99,6 +99,7 @@ CSRF_TRUSTED_ORIGINS = [urlparse(SITE_URL).hostname]
 
 PRETIX_PLUGINS_DEFAULT = config.get('pretix', 'plugins_default',
                                     fallback='pretix.plugins.sendmail,pretix.plugins.statistics,pretix.plugins.checkinlists')
+PRETIX_PLUGINS_EXCLUDE = config.get('pretix', 'plugins_exclude', fallback='').split(',')
 
 FETCH_ECB_RATES = config.getboolean('pretix', 'ecb_rates', fallback=True)