Move roles/matrix* to roles/custom/matrix*

This paves the way for installing other roles into `roles/galaxy` using `ansible-galaxy`,
similar to how it's done in:

- https://github.com/spantaleev/gitea-docker-ansible-deploy
- https://github.com/spantaleev/nextcloud-docker-ansible-deploy

In the near future, we'll be removing a lot of the shared role code from here
and using upstream roles for it. Some of the core `matrix-*` roles have
already been extracted out into other reusable roles:

- https://github.com/devture/com.devture.ansible.role.postgres
- https://github.com/devture/com.devture.ansible.role.systemd_docker_base
- https://github.com/devture/com.devture.ansible.role.timesync
- https://github.com/devture/com.devture.ansible.role.vars_preserver
- https://github.com/devture/com.devture.ansible.role.playbook_runtime_messages
- https://github.com/devture/com.devture.ansible.role.playbook_help

We just need to migrate to those.

roles/custom/matrix-redis/defaults/main.yml

@@ -0,0 +1,25 @@
+---
+# Project source code URL: https://github.com/redis/redis
+
+matrix_redis_enabled: true
+
+matrix_redis_connection_password: ""
+
+matrix_redis_base_path: "{{ matrix_base_data_path }}/redis"
+matrix_redis_data_path: "{{ matrix_redis_base_path }}/data"
+
+matrix_redis_version: 7.0.4-alpine
+matrix_redis_docker_image_v6: "{{ matrix_container_global_registry_prefix }}redis:{{ matrix_redis_version }}"
+matrix_redis_docker_image_latest: "{{ matrix_redis_docker_image_v6 }}"
+matrix_redis_docker_image_to_use: '{{ matrix_redis_docker_image_latest }}'
+
+matrix_redis_docker_image_force_pull: "{{ matrix_redis_docker_image_to_use.endswith(':latest') }}"
+
+# A list of extra arguments to pass to the container
+matrix_redis_container_extra_arguments: []
+
+# Controls whether the matrix-redis container exposes a port (tcp/6379 in the container)
+# that can be used to access redis from outside the container
+#
+# Takes an "<ip>:<port>" or "<port>" value (e.g. "127.0.0.1:6379"), or empty string to not expose.
+matrix_redis_container_redis_bind_port: ""

roles/custom/matrix-redis/tasks/init.yml

@@ -0,0 +1,5 @@
+---
+
+- ansible.builtin.set_fact:
+    matrix_systemd_services_list: "{{ matrix_systemd_services_list + ['matrix-redis'] }}"
+  when: matrix_redis_enabled | bool

roles/custom/matrix-redis/tasks/main.yml

@@ -0,0 +1,11 @@
+---
+
+- ansible.builtin.import_tasks: "{{ role_path }}/tasks/init.yml"
+  tags:
+    - always
+
+- ansible.builtin.import_tasks: "{{ role_path }}/tasks/setup_redis.yml"
+  when: run_setup | bool
+  tags:
+    - setup-all
+    - setup-redis

roles/custom/matrix-redis/tasks/setup_redis.yml

@@ -0,0 +1,104 @@
+---
+
+#
+# Tasks related to setting up an internal redis server
+#
+
+- name: Ensure redis Docker image is pulled
+  community.docker.docker_image:
+    name: "{{ matrix_redis_docker_image_to_use }}"
+    source: "{{ 'pull' if ansible_version.major > 2 or ansible_version.minor > 7 else omit }}"
+    force_source: "{{ matrix_redis_docker_image_force_pull if ansible_version.major > 2 or ansible_version.minor >= 8 else omit }}"
+    force: "{{ omit if ansible_version.major > 2 or ansible_version.minor >= 8 else matrix_redis_docker_image_force_pull }}"
+  when: matrix_redis_enabled | bool
+  register: result
+  retries: "{{ matrix_container_retries_count }}"
+  delay: "{{ matrix_container_retries_delay }}"
+  until: result is not failed
+
+- name: Ensure redis paths exist
+  ansible.builtin.file:
+    path: "{{ item }}"
+    state: directory
+    mode: 0700
+    owner: "{{ matrix_user_username }}"
+    group: "{{ matrix_user_username }}"
+  with_items:
+    - "{{ matrix_redis_base_path }}"
+    - "{{ matrix_redis_data_path }}"
+  when: matrix_redis_enabled | bool
+
+# We do this as a separate task, because:
+# - we'd like to do it for the data path only, not for the base path (which contains root-owned environment variable files we'd like to leave as-is)
+# - we need to do it without `mode`, or we risk making certain `.conf` and other files's executable bit to flip to true
+- name: Ensure redis data path ownership is correct
+  ansible.builtin.file:
+    path: "{{ matrix_redis_data_path }}"
+    state: directory
+    owner: "{{ matrix_user_username }}"
+    group: "{{ matrix_user_username }}"
+    recurse: true
+  when: matrix_redis_enabled | bool
+
+- name: Ensure redis environment variables file created
+  ansible.builtin.template:
+    src: "{{ role_path }}/templates/{{ item }}.j2"
+    dest: "{{ matrix_redis_base_path }}/{{ item }}"
+    mode: 0644
+  with_items:
+    - "redis.conf"
+  when: matrix_redis_enabled | bool
+
+- name: Ensure matrix-redis.service installed
+  ansible.builtin.template:
+    src: "{{ role_path }}/templates/systemd/matrix-redis.service.j2"
+    dest: "{{ matrix_systemd_path }}/matrix-redis.service"
+    mode: 0644
+  register: matrix_redis_systemd_service_result
+  when: matrix_redis_enabled | bool
+
+- name: Ensure systemd reloaded after matrix-redis.service installation
+  ansible.builtin.service:
+    daemon_reload: true
+  when: "matrix_redis_enabled | bool and matrix_redis_systemd_service_result.changed"
+
+#
+# Tasks related to getting rid of the internal redis server (if it was previously enabled)
+#
+
+- name: Check existence of matrix-redis service
+  ansible.builtin.stat:
+    path: "{{ matrix_systemd_path }}/matrix-redis.service"
+  register: matrix_redis_service_stat
+  when: "not matrix_redis_enabled | bool"
+
+- name: Ensure matrix-redis is stopped
+  ansible.builtin.service:
+    name: matrix-redis
+    state: stopped
+    enabled: false
+    daemon_reload: true
+  when: "not matrix_redis_enabled | bool and matrix_redis_service_stat.stat.exists"
+
+- name: Ensure matrix-redis.service doesn't exist
+  ansible.builtin.file:
+    path: "{{ matrix_systemd_path }}/matrix-redis.service"
+    state: absent
+  when: "not matrix_redis_enabled | bool and matrix_redis_service_stat.stat.exists"
+
+- name: Ensure systemd reloaded after matrix-redis.service removal
+  ansible.builtin.service:
+    daemon_reload: true
+  when: "not matrix_redis_enabled | bool and matrix_redis_service_stat.stat.exists"
+
+- name: Check existence of matrix-redis local data path
+  ansible.builtin.stat:
+    path: "{{ matrix_redis_data_path }}"
+  register: matrix_redis_data_path_stat
+  when: "not matrix_redis_enabled | bool"
+
+# We just want to notify the user. Deleting data is too destructive.
+- name: Notify if matrix-redis local data remains
+  ansible.builtin.debug:
+    msg: "Note: You are not using a local redis instance, but some old data remains from before in `{{ matrix_redis_data_path }}`. Feel free to delete it."
+  when: "not matrix_redis_enabled | bool and matrix_redis_data_path_stat.stat.exists"

roles/custom/matrix-redis/templates/redis.conf.j2

@@ -0,0 +1,4 @@
+#jinja2: lstrip_blocks: "True"
+{% if matrix_redis_connection_password %}
+requirepass {{ matrix_redis_connection_password }}
+{% endif %}

roles/custom/matrix-redis/templates/systemd/matrix-redis.service.j2

@@ -0,0 +1,37 @@
+#jinja2: lstrip_blocks: "True"
+[Unit]
+Description=Matrix Redis server
+After=docker.service
+Requires=docker.service
+
+[Service]
+Type=simple
+ExecStartPre=-/usr/bin/docker stop matrix-redis
+ExecStartPre=-/usr/bin/docker rm matrix-redis
+
+ExecStart=/usr/bin/docker run --rm --name matrix-redis \
+			--log-driver=none \
+			--user={{ matrix_user_uid }}:{{ matrix_user_gid }} \
+			--cap-drop=ALL \
+			--read-only \
+			--tmpfs=/tmp:rw,noexec,nosuid,size=100m \
+			--network={{ matrix_docker_network }} \
+			{% if matrix_redis_container_redis_bind_port %}
+			-p {{ matrix_redis_container_redis_bind_port }}:6379 \
+			{% endif %}
+			--mount type=bind,src={{ matrix_redis_base_path }}/redis.conf,dst=/usr/local/etc/redis/redis.conf,ro \
+			--mount type=bind,src={{ matrix_redis_data_path }},dst=/data \
+			{% for arg in matrix_redis_container_extra_arguments %}
+			{{ arg }} \
+			{% endfor %}
+			{{ matrix_redis_docker_image_to_use }} \
+			redis-server /usr/local/etc/redis/redis.conf
+
+ExecStop=-/usr/bin/docker stop matrix-redis
+ExecStop=-/usr/bin/docker rm matrix-redis
+Restart=always
+RestartSec=30
+SyslogIdentifier=matrix-redis
+
+[Install]
+WantedBy=multi-user.target