[System] plugins can register a post install routine, for e.g. filling the database.

flaschengeist/app.py

@@ -50,7 +50,7 @@ def __load_plugins(app):
                 app.config["FG_AUTH_BACKEND"] = plugin
             else:
                 del plugin
-        else:
+        if plugin:
             app.config["FG_PLUGINS"][entry_point.name] = plugin
     if "FG_AUTH_BACKEND" not in app.config:
         logger.error("No authentication plugin configured or authentication plugin not found")
@@ -61,14 +61,18 @@ def install_all():
 
     db.create_all()
     db.session.commit()
+    installed = []
     for name, plugin in current_app.config["FG_PLUGINS"].items():
         if not plugin:
             logger.debug("Skip disabled plugin {}".format(name))
             continue
         logger.info("Install plugin {}".format(name))
         plugin.install()
+        installed.append(plugin)
         if plugin.permissions:
             roleController.create_permissions(plugin.permissions)
+    for plugin in installed:
+        plugin.post_install()
 
 
 def create_app(test_config=None):

flaschengeist/plugins/__init__.py

@@ -44,6 +44,12 @@ class Plugin:
         """
         pass
 
+    def post_install(self):
+        """Fill database or do other stuff
+        Called after all plugins are installed
+        """
+        pass
+
     def serialize(self):
         """Serialize a plugin into a dict