ansible/roles/zfs/tasks/create_pool.yml

---

- name: Check if pool exists
  command: zpool list -Ho name {{ pool.name }}
  changed_when: false
  failed_when: false
  check_mode: no
  register: pool_exists

- name: Create pool
  check_mode: no
  command: >-
    zpool create
    {{ '-n' if ansible_check_mode else '' }}
    {{ '-m ' + pool.mountpoint if pool.mountpoint is defined else '' }}
    {{ pool.name }}
    {% if pool.vdevs is defined %}
      {% for vdev in pool.vdevs %}
        {{ vdev.type }}
        {% for disk in vdev.disks %}
          {{ disk }}
        {% endfor %} 
      {% endfor %}
      {% if pool.spares is defined %}
        spare
        {% for disk in pool.spares %}
          {{ disk }}
        {% endfor %}
      {% endif %}
    {% else %}
        {% for disk in pool.disks %}
          {{ disk }}
        {% endfor %}
    {% endif %}
    {% if pool.properties is defined %}
      {% for property in pool.properties | dict2items %}
        -o {{ property.key }}={{ property.value }}
      {% endfor %}
    {% endif %}
  when: pool_exists.rc == 1

- name: Set pool compression
  command: zfs set compression={{ pool.compression }} {{ pool.name }}
  when: pool.compression is defined and pool_exists.rc == 1

- name: Create datasets in the pool
  community.general.zfs:
    name: "{{ pool.name }}/{{ item.name }}"
    extra_zfs_properties: "{{ item.properties | default(omit) }}"
    state: present
  loop: "{{ pool.datasets | default(omit) }}"