feat: updated migration of vars

Author: kemboi22

imageroot/actions/create-module/10configure_vars

@@ -39,8 +39,8 @@ maria_db = {
 app = {
     "DB_HOST": "mariadb-app",
     "DB_PORT": "3306",
-    "DB_USER": MARIADB_USER,
-    "DB_PASS": MARIADB_PASSWORD,
+    "DB_USERNAME": MARIADB_USER,
+    "DB_PASSWORD": MARIADB_PASSWORD,
     "DB_DATABASE": MARIADB_DATABASE,
     "APP_KEY": generate_random_password(64),
 }

imageroot/update-module.d/migrate_vars

@@ -0,0 +1,17 @@
+#!/usr/bin/env python3
+
+#
+# Copyright (C) 2022 Nethesis S.r.l.
+# SPDX-License-Identifier: GPL-3.0-or-later
+#
+
+import os
+import agent
+
+if os.path.exists("app-db.env"):
+    dt = agent.read_envfile("app-db.env")
+    if "DB_USERNAME" not in dt and "DB_USER" in dt:
+        dt["DB_USERNAME"] = dt.pop("DB_USER")
+    if "DB_PASSWORD" not in dt and "DB_PASS" in dt:
+        dt["DB_PASSWORD"] = dt.pop("DB_PASS")
+    agent.write_envfile("app-db.env", dt)