Pass the configuration file used by the application to the Alembic process.

The database settings could also be overridden in the configuration file
besides the command line.

We should therefore pass the path to the runtime configuration file, so
the Alembic process can initialize its configuration from the same file
and use the same settings.

platypush/config/__init__.py

@@ -530,5 +530,12 @@ class Config:
         # pylint: disable=protected-access
         cls._get_instance()._config[key] = value
 
+    @classmethod
+    def get_file(cls) -> str:
+        """
+        :return: The main configuration file path.
+        """
+        return cls._get_instance().config_file
+
 
 # vim:sw=4:ts=4:et:

platypush/entities/_base.py

@@ -29,6 +29,7 @@ from sqlalchemy.orm import ColumnProperty, backref, relationship
 from sqlalchemy.orm.exc import ObjectDeletedError
 
 import platypush
+from platypush.config import Config
 from platypush.common.db import Base
 from platypush.message import JSONAble, Message
 
@@ -355,6 +356,8 @@ def run_db_migrations():
             '-c',
             alembic_ini,
             '-x',
+            f'CFGFILE={Config.get_file()}',
+            '-x',
             f'DBNAME={_get_db_engine().url}',
             'upgrade',
             'head',

platypush/migrations/alembic/env.py

@@ -74,6 +74,10 @@ def run_migrations_online() -> None:
 
 
 def set_db_engine():
+    app_conf_file = context.get_x_argument(as_dictionary=True).get('CFGFILE')
+    if app_conf_file:
+        Config.init(app_conf_file)
+
     engine_url = context.get_x_argument(as_dictionary=True).get('DBNAME')
     if not engine_url:
         db_conf = Config.get('db')