- block:
  - name: is additonal Cell?
    set_fact:
      nova_additional_cell: false
  - block:
    - name: discover via nova_manager?
      set_fact:
        nova_cellv2_discovery_container: nova_manager
        nova_cellv2_discovery_delegate_host: '{{ groups[''nova_manager''][0] }}'
      when:
      - groups['nova_manager'] is defined and (groups['nova_manager']|length>0)
    - name: discover via nova_api?
      set_fact:
        nova_cellv2_discovery_container: nova_api
        nova_cellv2_discovery_delegate_host: '{{ groups[''nova_api''][0] }}'
      when:
      - nova_cellv2_discovery_delegate_host is not defined
      - groups['nova_api'] is defined and (groups['nova_api']|length>0)
    - fail:
        msg: No hosts available to run nova cell_v2 host discovery.
      ignore_errors: true
      name: Warn if no discovery host available
      when:
      - nova_cellv2_discovery_delegate_host is not defined
    - become: true
      changed_when: false
      command: '{{ container_cli }} exec {{ nova_cellv2_discovery_container }} nova-manage
        cell_v2 discover_hosts --by-service'
      delegate_to: '{{ nova_cellv2_discovery_delegate_host }}'
      name: Discovering nova hosts
      when:
      - nova_cellv2_discovery_delegate_host is defined
    - set_fact:
        nova_cellv2_discovery_done: true
    name: check if discover hosts is required
    when:
    - not nova_additional_cell|bool
    - nova_cellv2_discovery_done is not defined