---
- name: Ensure that source_image is defined
  assert:
    that:
      - source_image is defined
      - source_image | length > 0

- name: Ensure that container_build_tool is correctly set
  fail: msg="{{ container_build_tool }} is not a valid value for
             container_build_tool. Pick docker or buildah."
  when: container_build_tool not in ['docker', 'buildah']

- name: Set default modified_append_tag
  set_fact:
    modified_append_tag: "{{ lookup('pipe','date +-modified-%Y%m%d%H%M%S') }}"
  when: modified_append_tag is undefined