---
- name: Create Docker apt keyring dir
  ansible.builtin.file:
    path: /etc/apt/keyrings
    state: directory
    mode: "0755"

- name: Add Docker's official GPG key
  ansible.builtin.get_url:
    url: https://download.docker.com/linux/ubuntu/gpg
    dest: /etc/apt/keyrings/docker.asc
    mode: "0644"

- name: Add Docker apt repository
  ansible.builtin.apt_repository:
    repo: >-
      deb [arch={{ 'arm64' if ansible_architecture == 'aarch64' else 'amd64' }}
      signed-by=/etc/apt/keyrings/docker.asc]
      https://download.docker.com/linux/ubuntu {{ ansible_distribution_release }} stable
    filename: docker
    state: present

- name: Ensure the ZFS docker dataset is mounted at the data-root
  ansible.builtin.command: "zfs get -H -o value mounted {{ zfs_pool_name }}/platform/docker"
  register: docker_ds_mounted
  changed_when: false
  failed_when: docker_ds_mounted.stdout != "yes"
  # The zfs role creates tank/platform/docker with mountpoint=/var/lib/docker.
  # This guards against installing Docker onto the wrong (non-ZFS) filesystem.

- name: Ensure /etc/docker exists
  ansible.builtin.file:
    path: /etc/docker
    state: directory
    mode: "0755"

- name: Write Docker daemon configuration (before first start, so the zfs
        storage driver initializes on the empty ZFS data-root)
  ansible.builtin.template:
    src: daemon.json.j2
    dest: /etc/docker/daemon.json
    owner: root
    group: root
    mode: "0644"
  notify: Restart docker

- name: Install Docker Engine + Compose plugin
  ansible.builtin.apt:
    name:
      - docker-ce
      - docker-ce-cli
      - containerd.io
      - docker-buildx-plugin
      - docker-compose-plugin
    state: present
    update_cache: true

- name: Ensure Docker is enabled and running
  ansible.builtin.systemd:
    name: docker
    enabled: true
    state: started