matrix-docker-ansible-deploy/roles/matrix-postgres-backup/tasks/setup_postgres_backup.yml

---

#
# Tasks related to setting up postgres backup
#
- ansible.builtin.import_role:
    name: matrix-postgres
    tasks_from: detect_existing_postgres_version
  when: 'matrix_postgres_backup_enabled | bool and matrix_postgres_backup_postgres_data_path != ""'

# If we have found an existing version (installed from before), we use its corresponding Docker image.
# If not, we install using the latest Postgres.
#
# Upgrading is supposed to be performed separately and explicitly (see `upgrade_postgres.yml`).
- ansible.builtin.set_fact:
    matrix_postgres_backup_docker_image_to_use: "{{ matrix_postgres_backup_docker_image_latest if matrix_postgres_backup_detected_version_corresponding_docker_image | default('') == '' else matrix_postgres_backup_detected_version_corresponding_docker_image }}"
  when: matrix_postgres_backup_enabled | bool

- name: Ensure postgres backup Docker image is pulled
  docker_image:
    name: "{{ matrix_postgres_backup_docker_image_to_use }}"
    source: "{{ 'pull' if ansible_version.major > 2 or ansible_version.minor > 7 else omit }}"
    force_source: "{{ matrix_postgres_backup_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_postgres_backup_docker_image_force_pull }}"
  when: matrix_postgres_backup_enabled | bool
  register: result
  retries: "{{ matrix_container_retries_count }}"
  delay: "{{ matrix_container_retries_delay }}"
  until: result is not failed

- name: Ensure Postgres backup paths exist
  ansible.builtin.file:
    path: "{{ item }}"
    state: directory
    mode: 0700
    owner: "{{ matrix_user_username }}"
    group: "{{ matrix_user_groupname }}"
  with_items:
    - "{{ matrix_postgres_backup_path }}"
  when: matrix_postgres_backup_enabled | bool

- name: Ensure Postgres environment variables file created
  ansible.builtin.template:
    src: "{{ role_path }}/templates/{{ item }}.j2"
    dest: "{{ matrix_postgres_backup_path }}/{{ item }}"
    owner: "{{ matrix_user_username }}"
    group: "{{ matrix_user_groupname }}"
    mode: 0640
  with_items:
    - "env-postgres-backup"
  when: matrix_postgres_backup_enabled | bool

- name: Ensure matrix-postgres-backup.service installed
  ansible.builtin.template:
    src: "{{ role_path }}/templates/systemd/matrix-postgres-backup.service.j2"
    dest: "{{ matrix_systemd_path }}/matrix-postgres-backup.service"
    mode: 0644
  register: matrix_postgres_backup_systemd_service_result
  when: matrix_postgres_backup_enabled | bool

- name: Ensure systemd reloaded after matrix-postgres-backup.service installation
  ansible.builtin.service:
    daemon_reload: true
  when: "matrix_postgres_backup_enabled | bool and matrix_postgres_backup_systemd_service_result.changed"

#
# Tasks related to getting rid of postgres backup (if it was previously enabled)
#

- name: Check existence of matrix-postgres-backup service
  ansible.builtin.stat:
    path: "{{ matrix_systemd_path }}/matrix-postgres-backup.service"
  register: matrix_postgres_backup_service_stat
  when: "not matrix_postgres_backup_enabled | bool"

- name: Ensure matrix-postgres-backup is stopped
  ansible.builtin.service:
    name: matrix-postgres-backup
    state: stopped
    enabled: false
    daemon_reload: true
  when: "not matrix_postgres_backup_enabled | bool and matrix_postgres_backup_service_stat.stat.exists"

- name: Ensure matrix-postgres-backup.service doesn't exist
  ansible.builtin.file:
    path: "{{ matrix_systemd_path }}/matrix-postgres-backup.service"
    state: absent
  when: "not matrix_postgres_backup_enabled | bool and matrix_postgres_backup_service_stat.stat.exists"

- name: Ensure systemd reloaded after matrix-postgres-backup.service removal
  ansible.builtin.service:
    daemon_reload: true
  when: "not matrix_postgres_backup_enabled | bool and matrix_postgres_backup_service_stat.stat.exists"

- name: Check existence of matrix-postgres-backup backup path
  ansible.builtin.stat:
    path: "{{ matrix_postgres_backup_path }}"
  register: matrix_postgres_backup_path_stat
  when: "not matrix_postgres_backup_enabled | bool"

# We just want to notify the user. Deleting data is too destructive.
- name: Inject warning if matrix-postgres backup data remains
  ansible.builtin.set_fact:
    matrix_playbook_runtime_results: |
      {{
        matrix_playbook_runtime_results | default([])
        +
        [
          "NOTE: You are not using the local backup service to backup the PostgreSQL database, but some old data remains from before in `{{ matrix_postgres_backup_path }}`. Feel free to delete it."
        ]
      }}      
  when: "not matrix_postgres_backup_enabled | bool and matrix_postgres_backup_path_stat.stat.exists"