---
# this role installs the bridge and reboots. 
# optionally it creates a new inventory file on the jenkins host
# if the appropriate variable is declared

- name: Install iptables-persistent
  apt:
    name:
      - iptables-persistent
    state: present

# check interfaces
- name: check interfaces for vmpbr0
  shell: ip -o -4 ad
  register: ip_ad_output

- name: install bridge
  when: '"vmpbr0" not in ip_ad_output.stdout'
  include_tasks: create_bridge.yaml

# Create new inventory file
- name: create inventory file
  when: create_inventory | bool
  block:
  - name: get bridge IP
    shell: ip -o -4 ad li | grep {{ bridge_name }} | awk '{print $4}' | cut -d '/' -f 1
    register: bridge_ip_output

  - name: set bridge_address variable
    set_fact:
      bridge_address: "{{ bridge_ip_output.stdout_lines[0] }}"

  - name: show bridge address
    debug:
      msg: 
        - "{{ bridge_address }}"

  - name: Network Bridge - Create new inventory file on jenkins server
    delegate_to: localhost
    template:
      src: inventory.j2
      dest: "/var/jenkins_home/ansible/.inv/inventory-{{ STAGE_TWO_HASH }}.yml"

- name: Reboot
  when: '"vmpbr0" not in ip_ad_output.stdout'
  shell: "( sleep 5 ; reboot now ) & "
  ignore_errors: yes

...