docker-compose/tasks/main.yml

---

# Install docker-compose

- name: Ensure pip to be available
  apt:
    name: python-pip
    cache_valid_time: 86400

- name: Install or update docker-compose
  pip:
    name: docker-compose
    executable: pip
    state: latest
  register: docker_compose

# Configure docker-compose

- name: Create configuration directory
  file:
    dest: /etc/docker-compose
    state: directory
    mode: 0700

- name: Write docker-compose.yml
  template:
    dest: /etc/docker-compose/docker-compose.yml
    src: templates/docker-compose.yml
    mode: 0600
  register: compose_file

- name: Validate configuration
  command: docker-compose config -q
  args:
    chdir: /etc/docker-compose
  when: compose_file.changed and docker_compose_validate

# Install and start services

- name: Install docker-compose.service
  copy:
    dest: /etc/systemd/system/docker-compose.service
    content: |
      [Unit]
      Description=Docker Compose container starter
      After=docker.service network-online.target
      Requires=docker.service network-online.target

      [Service]
      WorkingDirectory=/etc/docker-compose
      Type=oneshot
      RemainAfterExit=yes

      ExecStartPre=-/usr/local/bin/docker-compose pull --quiet --ignore-pull-failures
      ExecStart=/usr/local/bin/docker-compose up -d --remove-orphans

      ExecStop=/usr/local/bin/docker-compose {{ docker_compose_stop_action }}

      ExecReload=/usr/local/bin/docker-compose pull --quiet --ignore-pull-failures
      ExecReload=/usr/local/bin/docker-compose up -d --remove-orphans

      [Install]
      WantedBy=docker.service
  register: docker_compose_service

- name: Enable docker-compose service
  systemd:
    name: docker-compose.service
    daemon_reload: yes
    enabled: yes

- name: Restart service if service configuration changed
  systemd:
    name: docker-compose.service
    daemon_reload: yes
    state: restarted
  when: docker_compose_service.changed and packer_build_name is not defined

- name: Reload and apply configuration
  systemd:
    name: docker-compose.service
    state: reloaded
  when: (docker_compose.changed or compose_file.changed) and packer_build_name is not defined

- name: Install docker-compose-reload.service
  copy:
    dest: /etc/systemd/system/docker-compose-reload.service
    content: |
      [Unit]
      Description=Refresh images and update containers

      [Service]
      Type=oneshot

      ExecStart=/bin/systemctl reload-or-restart docker-compose.service

- name: Install docker-compose-reload.timer
  copy:
    dest: /etc/systemd/system/docker-compose-reload.timer
    content: |
      [Unit]
      Description=Refresh images and update containers
      Requires=docker-compose.service
      After=docker-compose.service

      [Timer]
      OnCalendar=*:0/{{ docker_compose_reload_minutes }}
      RandomizedDelaySec={{ docker_compose_reload_max_delay }}

      [Install]
      WantedBy=timers.target
  register: docker_compose_reload_timer

- name: Enable docker-compose-reload.timer
  systemd:
    name: docker-compose-reload.timer
    daemon_reload: yes
    enabled: yes

- name: Restart docker-compose-reload.timer if it changed
  systemd:
    name: docker-compose-reload.timer
    daemon_reload: yes
    state: restarted
  when: docker_compose_reload_timer.changed and packer_build_name is not defined

- name: Install docker-clean script
  copy:
    content: |
      #!/bin/bash
      set -euo pipefail
      
      function step() { echo $@; }
      
      step "Removing containers created / exited >= ~1h ago..."
      CONTAINERS=$(docker ps -a | gawk '/(hours?|days?|weeks?|months?) ago\s+(Created|Exited)/{ print $1 }' | xargs)
      [ -n "${CONTAINERS}" ] && docker rm ${CONTAINERS}
      
      step "Removing unused and dangling images..."
      docker image prune -a -f
    dest: /usr/local/bin/docker-clean
    mode: '0755'
    owner: 'root'
    group: 'root'
  when: docker_compose_add_cleanjob

- name: Install docker-clean.service
  copy:
    dest: /etc/systemd/system/docker-clean.service
    content: |
      [Unit]
      Description=Clean out old containers and unused images

      [Service]
      Type=oneshot
      ExecStart=/usr/local/bin/docker-clean
  when: docker_compose_add_cleanjob

- name: Install docker-clean.timer
  copy:
    dest: /etc/systemd/system/docker-clean.timer
    content: |
      [Unit]
      Description=Clean out old containers and unused images

      [Timer]
      OnCalendar=*:0

      [Install]
      WantedBy=timers.target
  register: docker_compose_clean_timer
  when: docker_compose_add_cleanjob

- name: Enable docker-clean timer
  systemd:
    name: docker-clean.timer
    daemon_reload: yes
    enabled: yes
  when: docker_compose_add_cleanjob

- name: Restart docker-clean.timer if it changed
  systemd:
    name: docker-clean.timer
    daemon_reload: yes
    state: restarted
  when: docker_compose_clean_timer is defined and docker_compose_clean_timer.changed and packer_build_name is not defined and docker_compose_add_cleanjob

- name: Deactivate docker-clean timer
  systemd:
    name: docker-clean.timer
    daemon_reload: yes
    enabled: no
  when: not docker_compose_add_cleanjob

- name: Uninstall docker-clean components
  file:
    dest: '{{ item }}'
    state: absent
  with_items:
    - /usr/local/bin/docker-clean
    - /etc/systemd/system/docker-clean.service
    - /etc/systemd/system/docker-clean.timer
  when: not docker_compose_add_cleanjob