sync with previous repo

roles/matrix-bridge-appservice-discord/tasks/validate_config.yml

@@ -0,0 +1,26 @@
+---
+
+- name: Fail if required settings not defined
+  fail:
+    msg: >-
+      You need to define a required configuration setting (`{{ item }}`).
+  when: "vars[item] == ''"
+  with_items:
+    - "matrix_appservice_discord_client_id"
+    - "matrix_appservice_discord_bot_token"
+    - "matrix_appservice_discord_appservice_token"
+    - "matrix_appservice_discord_homeserver_token"
+    - "matrix_appservice_discord_homeserver_domain"
+
+- name: (Deprecation) Catch and report renamed appservice-discord variables
+  fail:
+    msg: >-
+      Your configuration contains a variable, which now has a different name.
+      Please change your configuration to rename the variable (`{{ item.old }}` -> `{{ item.new }}`).
+  when: "item.old in vars"
+  with_items:
+    - {'old': 'matrix_appservice_discord_container_expose_client_server_api_port', 'new': '<superseded by matrix_appservice_discord_container_http_host_bind_port>'}
+
+- name: Require a valid database engine
+  fail: msg="`matrix_appservice_discord_database_engine` needs to be either 'sqlite' or 'postgres'"
+  when: "matrix_appservice_discord_database_engine not in ['sqlite', 'postgres']"