- hosts: all
  pre_tasks:
    - name: Gather minimum local MTU
      set_fact:
        local_mtu: >
          {% set mtus = [] -%}
          {% for interface in ansible_interfaces -%}
            {% set interface_variable = 'ansible_' + interface -%}
            {% if interface_variable in hostvars[inventory_hostname] -%}
              {% set _ = mtus.append(hostvars[inventory_hostname][interface_variable]['mtu']|int) -%}
            {% endif -%}
          {% endfor -%}
          {{- mtus|min -}}
    - name: Calculate external_bridge_mtu
      # 50 bytes is overhead for vxlan (which is greater than GRE
      # allowing us to use either overlay option with this MTU.
      # TODO(andreaf) This should work, but it may have to be reconcilied with
      # the MTU setting used by the multinode setup roles in multinode pre.yaml
      set_fact:
        external_bridge_mtu: "{{ local_mtu | int - 50 }}"
  roles:
    - test-matrix
    - configure-swap
    - setup-stack-user
    - setup-tempest-user
    - setup-devstack-source-dirs
    - setup-devstack-log-dir
    - setup-devstack-cache
    - start-fresh-logging
    - write-devstack-local-conf