- name: Include OS-specific variables
  include_vars: "{{ item }}"
  with_first_found:
    - "{{ ansible_distribution }}.yaml"
    - "{{ ansible_os_family }}.yaml"
    - "default.yaml"

# CentOS requires repositories provided by centos in order to install
# openvswitch, set them up.
- name: Enable centos-release-openstack-queens
  become: yes
  package:
    name: centos-release-openstack-queens
    state: installed
  when:
    - ansible_os_family == "RedHat"
    - ansible_distribution != "Fedora"
  register: centos_ovs

- name: Install openvswitch
  become: yes
  package:
    name: "{{ ovs_package }}"
    state: installed

- name: Ensure openvswitch is started
  become: yes
  service:
    name: "{{ ovs_service }}"
    state: started
    enabled: yes

# If we've installed repositories for openvswitch earlier, remove them
- name: Ensure centos-release-openstack-queens is removed
  become: yes
  package:
    name: "centos-release-openstack-queens"
    state: absent
  when: centos_ovs | changed

- name: Authorize the multi-node-bridge network
  become: yes
  iptables:
    state: present
    action: insert
    chain: INPUT
    ip_version: ipv4
    source: "{{ bridge_address_prefix }}.0/{{ bridge_address_subnet }}"
    destination: "{{ bridge_address_prefix }}.0/{{ bridge_address_subnet }}"
    jump: ACCEPT
  when:
    - bridge_configure_address | bool
    - bridge_authorize_internal_traffic | bool

- when: bridge_mtu is not defined
  block:
    - name: Determine bridge mtu
      shell: |
        # Find all interfaces with a permanent mac address type.
        # Permanent mac addrs imply "real" hardware and not interfaces we have
        # created through this system. This makes our MTU determination mostly
        # idempotent allowing us to create multiple overlays without
        # perpetually smaller MTUs.
        SMALLEST_MTU=""
        for X in $(ls /sys/class/net) ; do
            MAC_TYPE=$(cat "/sys/class/net/${X}/addr_assign_type")
            if [ "$MAC_TYPE" -ne "0" ] ; then
                # Type 0 is a permanent address implying a "real"
                # interface. We ignore other interfaces as that is what we
                # create here
                continue
            fi
            MTU=$(cat "/sys/class/net/${X}/mtu")
            if [ -z "$SMALLEST_MTU" ] || [ "$SMALLEST_MTU" -gt "$MTU" ] ; then
                SMALLEST_MTU=$MTU
            fi
        done
        # 50 byte overhead for vxlan
        echo $(( SMALLEST_MTU - 50 ))
      args:
        executable: /bin/bash
      environment:
        PATH: '{{ ansible_env.PATH }}:/bin:/sbin:/usr/sbin'
      register: mtu_output
    - name: Set bridge_mtu
      set_fact:
        bridge_mtu: "{{ mtu_output.stdout }}"