ansible/test/integration/targets/include_import/run_once/playbook.yml

# This playbook exists to document the behavior of how run_once when
# applied to a dynamic include works
#
# As with other uses of keywords on dynamic includes, it only affects the include.
# In this case it causes the include to only be processed for ansible_play_hosts[0]
# which has the side effect of only running the tasks on ansible_play_hosts[0]
# and would only delegate facts of the include itself, not the tasks contained within

- hosts: localhost
  gather_facts: false
  tasks:
    - add_host:
        name: "{{ item }}"
        ansible_connection: local
        groups:
          - all
      loop:
        - localhost0
        - localhost1

    - add_host:
        name: "{{ item }}"
        groups:
          - testing
        ansible_connection: local
      loop:
        - localhost2
        - localhost3

- hosts: all:!testing
  gather_facts: false
  vars:
    lola: untouched
  tasks:
    - include_tasks:
        file: include_me.yml
        apply:
            run_once: true
      run_once: true

    - assert:
        that:
          - lola == 'wiseman'

- hosts: testing
  gather_facts: false
  vars:
    lola: untouched
  tasks:
    - include_tasks: include_me.yml
      run_once: true

    - assert:
        that:
          - lola == 'wiseman'
      when: inventory_hostname == ansible_play_hosts[0]

    - assert:
        that:
          - lola == 'untouched'
      when: inventory_hostname != ansible_play_hosts[0]