- name: Check to see if the constraints file exists
  stat:
    path: "{{ constraints_file|default('missing') }}"
    get_checksum: false
    get_mime: false
    get_md5: false
  register: stat_results
  when: constraints_file is defined

- name: Require defined constraints file to be found
  fail:
    msg: constraints_file was defined but was not found on the system
  when: constraints_file is defined and not stat_results.stat.exists

- name: Record file location
  set_fact:
    upper_constraints: "-c {{ constraints_file|realpath }}"
  when: not stat_results|skipped and stat_results.stat.exists