Do not introduce sub-variables exposing implementation details

roles/matrix-bridge-appservice-discord/defaults/main.yml

@@ -47,16 +47,23 @@ matrix_appservice_discord_bridge_enableSelfServiceBridging: false
 #
 # To use Postgres:
 # - change the engine (`matrix_appservice_discord_database_engine: 'postgres'`)
-# - adjust your database credentials
+# - adjust your database credentials via the `matrix_appservice_discord_postgres_*` variables
 matrix_appservice_discord_database_engine: 'sqlite'
-matrix_appservice_discord_database_filename: "/data/{{ matrix_appservice_discord_database_filename_name }}"
-matrix_appservice_discord_database_filename_name: "discord.db"
-matrix_appservice_discord_database_connString: 'postgresql://{{ matrix_appservice_discord_database_connString_username }}:{{ matrix_appservice_discord_database_connString_password }}@{{ matrix_appservice_discord_database_connString_hostname }}:{{ matrix_appservice_discord_database_connString_port }}/{{ matrix_appservice_discord_database_connString_db_name }}'
-matrix_appservice_discord_database_connString_username: 'matrix_appservice_discord'
-matrix_appservice_discord_database_connString_password: 'some-password'
-matrix_appservice_discord_database_connString_hostname: 'matrix-postgres'
-matrix_appservice_discord_database_connString_port: 5432
-matrix_appservice_discord_database_connString_db_name: 'matrix_appservice_discord'
+
+matrix_appservice_discord_sqlite_database_path_local: "{{ matrix_appservice_discord_data_path }}/discord.db"
+matrix_appservice_discord_sqlite_database_path_in_container: "/data/discord.db"
+
+matrix_appservice_discord_postgres_username: 'matrix_appservice_discord'
+matrix_appservice_discord_postgres_password: 'some-password'
+matrix_appservice_discord_postgres_hostname: 'matrix-postgres'
+matrix_appservice_discord_postgres_port: 5432
+matrix_appservice_discord_postgres_db_name: 'matrix_appservice_discord'
+
+# These 2 variables are what actually ends up in the bridge configuration.
+# It's best if you don't change them directly, but rather redefine the sub-variables that constitute them.
+matrix_appservice_discord_database_filename: "{{ matrix_appservice_discord_sqlite_database_path_in_container }}"
+matrix_appservice_discord_database_connString: 'postgresql://{{ matrix_appservice_discord_postgres_username }}:{{ matrix_appservice_discord_postgres_password }}@{{ matrix_appservice_discord_postgres_hostname }}:{{ matrix_appservice_discord_postgres_port }}/{{ matrix_appservice_discord_postgres_db_name }}'
+
 
 # Tells whether the bot should make use of "Privileged Gateway Intents".
 #

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

@@ -1,26 +1,23 @@
 ---
 
 - block:
-  - set_fact:
-      matrix_appservice_discord_sqlite_db_path: "{{ matrix_appservice_discord_data_path }}/{{ matrix_appservice_discord_database_filename_name }}"
-
   - name: Check if an SQLite database already exists
     stat:
-      path: "{{ matrix_appservice_discord_sqlite_db_path }}"
-    register: matrix_appservice_discord_sqlite_db_path_stat_result
+      path: "{{ matrix_appservice_discord_sqlite_database_path_local }}"
+    register: matrix_appservice_discord_sqlite_database_path_local_stat_result
 
   - name: Fail if an SQLite database already exists when using Postgres
     fail:
       msg: >-
         matrix_appservice_discord_database_engine has been set to `postgres` (which is our new default now).
-        However, we've discovered an existing SQLite database in {{ matrix_appservice_discord_data_path }}/{{ matrix_appservice_discord_database_filename_name }}.
+        However, we've discovered an existing SQLite database in {{ matrix_appservice_discord_sqlite_database_path_local }}.
         It appears that you've been using this bridge with the SQLite engine until now.
         To continue using SQLite, opt into it explicitly: add `matrix_appservice_discord_database_engine: sqlite` to your vars.yml file and re-run this same command.
         Alternatively, to migrate your existing SQLite database to Postgres:
         1. Stop all services (`ansible-playbook -i inventory/hosts setup.yml --tags=stop`)
-        2. Import the SQLite database into Postgres (`ansible-playbook -v -i inventory/hosts setup.yml --tags=import-generic-sqlite-db --extra-vars='sqlite_database_path={{ matrix_appservice_discord_sqlite_db_path }} postgres_db_connection_string={{ matrix_appservice_discord_database_connString }}'`)
+        2. Import the SQLite database into Postgres (`ansible-playbook -v -i inventory/hosts setup.yml --tags=import-generic-sqlite-db --extra-vars='sqlite_database_path={{ matrix_appservice_discord_sqlite_database_path_local }} postgres_db_connection_string={{ matrix_appservice_discord_database_connString }}'`)
         3. Re-run the playbook (`ansible-playbook -i inventory/hosts setup.yml --tags=setup-all,start`)
-    when: "matrix_appservice_discord_sqlite_db_path_stat_result.stat.exists"
+    when: "matrix_appservice_discord_sqlite_database_path_local_stat_result.stat.exists"
   when: "matrix_appservice_discord_database_engine == 'postgres'"
 
 - name: Ensure Appservice Discord image is pulled