Separate Facebook bridge configuration and data

Using a separate directory allows easier backups
(only need to back up the Ansible playbook configuration and the
bridge's `./data` directory).

The playbook takes care of migrating an existing database file
from the base directory into the `./data` directory.

In the future, we can also mount the configuration read-only,
to ensure the bridge won't touch it.
For now, mautrix-facebook is keen on rebuilding the `config.yaml`
file on startup though, so this will have to wait.

roles/matrix-bridge-mautrix-facebook/tasks/setup_install.yml

@@ -13,18 +13,45 @@
     name: "{{ matrix_mautrix_facebook_docker_image }}"
     source: "{{ 'pull' if ansible_version.major > 2 or ansible_version.minor > 7 else omit }}"
 
-- name: Ensure Mautrix Facebook base directory exists
+- name: Ensure Mautrix Facebook paths exist
   file:
-    path: "{{ matrix_mautrix_facebook_base_path }}"
+    path: "{{ item }}"
     state: directory
     mode: 0750
     owner: "{{ matrix_user_username }}"
     group: "{{ matrix_user_username }}"
+    recurse: true
+  with_items:
+    - "{{ matrix_mautrix_facebook_base_path }}"
+    - "{{ matrix_mautrix_facebook_config_path }}"
+    - "{{ matrix_mautrix_facebook_data_path }}"
+
+- name: Check if an old database file already exists
+  stat:
+    path: "{{ matrix_mautrix_facebook_base_path }}/mautrix-facebook.db"
+  register: matrix_mautrix_facebook_stat_database
+
+- name: (Data relocation) Ensure matrix-mautrix-facebook.service is stopped
+  service:
+    name: matrix-mautrix-facebook
+    state: stopped
+    daemon_reload: yes
+  register: stopping_result
+  failed_when: false
+  when: "matrix_mautrix_facebook_stat_database.stat.exists"
+
+- name: (Data relocation) Move mautrix-facebook database file to ./data directory
+  command: "mv {{ matrix_mautrix_facebook_base_path }}/mautrix-facebook.db {{ matrix_mautrix_facebook_data_path }}/mautrix-facebook.db"
+  when: "matrix_mautrix_facebook_stat_database.stat.exists"
+
+- name: (Data relocation) Move mautrix-facebook database file to ./data directory
+  command: "mv {{ matrix_mautrix_facebook_base_path }}/mautrix-facebook.db {{ matrix_mautrix_facebook_data_path }}/mautrix-facebook.db"
+  when: "matrix_mautrix_facebook_stat_database.stat.exists"
 
 - name: Ensure mautrix-facebook config.yaml installed
   copy:
     content: "{{ matrix_mautrix_facebook_configuration|to_nice_yaml }}"
-    dest: "{{ matrix_mautrix_facebook_base_path }}/config.yaml"
+    dest: "{{ matrix_mautrix_facebook_config_path }}/config.yaml"
     mode: 0644
     owner: "{{ matrix_user_username }}"
     group: "{{ matrix_user_username }}"
@@ -32,7 +59,7 @@
 - name: Ensure mautrix-facebook registration.yaml installed
   copy:
     content: "{{ matrix_mautrix_facebook_registration|to_nice_yaml }}"
-    dest: "{{ matrix_mautrix_facebook_base_path }}/registration.yaml"
+    dest: "{{ matrix_mautrix_facebook_config_path }}/registration.yaml"
     mode: 0644
     owner: "{{ matrix_user_username }}"
     group: "{{ matrix_user_username }}"
@@ -54,7 +81,7 @@
     matrix_synapse_container_extra_arguments: >
       {{ matrix_synapse_container_extra_arguments|default([]) }}
       +
-      {{ ["--mount type=bind,src={{ matrix_mautrix_facebook_base_path }}/registration.yaml,dst=/matrix-mautrix-facebook-registration.yaml,ro"] }}
+      {{ ["--mount type=bind,src={{ matrix_mautrix_facebook_config_path }}/registration.yaml,dst=/matrix-mautrix-facebook-registration.yaml,ro"] }}
 
     matrix_synapse_app_service_config_files: >
       {{ matrix_synapse_app_service_config_files|default([]) }}