- name: Check if ZFS dataset exists
  community.general.zfs_facts:
    dataset: "{{ zfs_dataset }}"
  register: zfs_dataset_exists_check
  ignore_errors: true

- name: Fail if ZFS dataset already exists
  ansible.builtin.fail:
    msg: "Dataset {{ zfs_dataset }} is already in-use."
  when: not zfs_dataset_exists_check.failed