---
- name: devices validation
  when: devices is defined
  block:
    - name: validate devices is actually a device
      parted:
        device: "{{ item }}"
        unit: MiB
      register: devices_parted
      with_items: "{{ devices }}"

    - name: fail if one of the devices is not a device
      fail:
        msg: "{{ item }} is not a block special file!"
      when: item.failed
      with_items: "{{ devices_parted.results }}"