tenks/ansible/physical_network.yml

---

- name: Gather os specific variables
  include_vars: "{{ item }}"
  with_first_found:
    - files:
        - "{{ ansible_distribution }}-{{ ansible_distribution_major_version }}.yml"
        - "{{ ansible_distribution }}.yml"
        - "{{ ansible_os_family }}.yml"
      skip: true
  tags: vars

- name: Fail if source interface does not exist
  fail:
    msg: >
      The interface {{ source_interface }} specified for the physical network
      {{ network_name }} does not exist.      
  when: source_interface not in ansible_interfaces

### Firstly, some fact gathering.
# Start off by assuming the source interface is direct, unless proven
# otherwise.
- name: Set initial value for source_type
  set_fact:
    source_type: direct

- name: Get source interface details
  command: >
    {{ tenks_ip_path }} -details link show {{ source_interface }}    
  register: if_details
  changed_when: false

- name: Register source interface as a Linux bridge
  set_fact:
    source_type: linuxbridge
  when: if_details.stdout_lines[-1].split()[0] == 'bridge'

- block:
    - name: Get list of OVS bridges
      command: ovs-vsctl list-br
      register: ovs_bridges
      changed_when: false
      become: true

    - name: Register source interface as an Open vSwitch bridge
      set_fact:
        source_type: openvswitch
      when: source_interface in ovs_bridges.stdout_lines

  when: if_details.stdout_lines[-1].split()[0] == 'openvswitch'


### Actual configuration starts here.
- name: Ensure Open vSwitch bridge is in the correct state
  openvswitch_bridge:
    bridge: "{{ tenks_bridge }}"
    state: "{{ state }}"
  become: true
  when: bridge_type == "openvswitch"

- block:
    - name: Check if Tenks bridge exists
      stat:
        path: /sys/class/net/{{ tenks_bridge }}
      register: stat_result

    - name: Ensure Tenks bridge exists
      vars:
        link_operation: "{{ 'add' if state == 'present' else 'del' }}"
      command: >-
        {{ tenks_ip_path }} link {{ link_operation }} {{ tenks_bridge }} type bridge        
      changed_when: true
      become: true
      when: >-
        state == 'present' and not stat_result.stat.exists or
        state == 'absent' and stat_result.stat.exists        

    - name: Ensure Tenks bridge is up
      command: >-
        {{ tenks_ip_path }} link set {{ tenks_bridge }} up        
      changed_when: true
      become: true
      when:
        - state == 'present'
        - not stat_result.stat.exists
  when: bridge_type == "linuxbridge"

- name: Configure existing Linux bridge
  when: source_type == 'linuxbridge'
  include_role:
    name: veth-pair
  vars:
    veth_pair_peer_bridge_type: "{{ bridge_type }}"
    veth_pair_peer_bridge: "{{ tenks_bridge }}"
    veth_pair_peer_link_name: >-
      {{ veth_prefix + tenks_bridge + veth_bridge_peer_suffix }}      
    veth_pair_source_bridge: "{{ source_interface }}"
    veth_pair_source_link_name: >-
      {{ veth_prefix + tenks_bridge + veth_bridge_source_suffix }}      
    veth_pair_plug_into_source: true
    veth_pair_state: "{{ state }}"

- name: Configure existing Open vSwitch bridge
  when: source_type == 'openvswitch'
  block:
    - name: Configure patch port on Tenks bridge
      openvswitch_port:
        bridge: "{{ tenks_bridge }}"
        port: "{{ veth_prefix + tenks_bridge + veth_bridge_peer_suffix }}"
        # Despite the module documentation, `set` will happily take multiple
        # properties.
        set: >-
          Interface {{ veth_prefix + tenks_bridge + veth_bridge_peer_suffix }}
            type=patch
            options:peer={{ veth_prefix + tenks_bridge +
                            veth_bridge_source_suffix }}          
      # If 'absent', we've already deleted the bridge earlier, so no need to
      # delete the port.
      when: state != 'absent'
      become: true

    - name: Configure patch port on source bridge
      openvswitch_port:
        bridge: "{{ source_interface }}"
        port: "{{ veth_prefix + tenks_bridge + veth_bridge_source_suffix }}"
        set: >-
          Interface {{ veth_prefix + tenks_bridge + veth_bridge_source_suffix }}
            type=patch
            options:peer={{ veth_prefix + tenks_bridge +
                            veth_bridge_peer_suffix }}          
        state: "{{ state }}"
      become: true

- name: Plug source interface into Tenks bridge
  openvswitch_port:
    bridge: "{{ tenks_bridge }}"
    port: "{{ source_interface }}"
    state: "{{ state }}"
  when:
    - bridge_type == 'openvswitch'
    - source_type == 'direct'
    # If 'absent', we've already deleted the bridge earlier, so no need to
    # unplug the interface.
    - state != 'absent'
  become: true

- block:
    - name: Speculatively check interface's master
      command: >-
        realpath /sys/class/net/{{ source_interface }}/master        
      register: master_result
      failed_when: false
      changed_when: false

    - name: Plug source interface into Tenks bridge
      command: >-
        {{ tenks_ip_path }} link set dev {{ source_interface }} master {{ tenks_bridge }}        
      changed_when: true
      when: master_result.rc != 0
  when:
    - bridge_type == 'linuxbridge'
    - source_type == 'direct'
    # If 'absent', we've already deleted the bridge earlier, so no need to
    # unplug the interface.
    - state != 'absent'
  become: true