register variables across plays

ansible-playbook.yml

- vars:
    # Extra vars from Rundeck for partition type
    partition: "{{ partition }}"

    # For 'nmctl ps' wrapper - Some deployment validation
    number_of_tries: 5
    sleep_between_tries: 60

  hosts: "app-{{ partition }}[0]" # Canary

  tags:
    - "canary"
  tasks:

  - name: "Grab the target app version set in the environment"
    shell: "knife environment show {{ chef_environment.stdout }} -c /etc/chef/client.rb -a default_attributes.app.install_build_version | grep version | awk '{ print $2 }'"
    register: "target_app_build"
    changed_when: False
    tags:
      - "version_check"
      - "upgrade_type"
      
  - name: "Find the app version running on the canary"
    command: "cat /home/app/builds/{{ app_branch.stdout }}/installed_app_version"
    register: "actual_app_build"
    changed_when: False
    tags:
      - "version_check"
      - "upgrade_type"
      
- name: "Setting up as fact target build"
  set_fact:
  target_app_build: "{{ target_app_build.stdout }}"

- name: "Setting up as fact actual build"
  set_fact:
  actual_app_build: "{{ actual_app_build.stdout }}"


- hosts: "app-{{ partition }}"
  tasks:
  - name: "Performing upgrade: Running Chef client"
    command: "chef-client"
    tags:
      - "app_upgrade"
      - "upgrade"


- hosts: "no-app-{{ partition }}"
  tasks:
  - name: "Performing upgrade: Running Chef client"
    command: "date"
    when: "{{ hostvars[groups['app-a1'][0]]['target_app_build'] }} != {{ hostvars[groups['app-a1'][0]]['actual_app_build'] }}"
    tags:
      - "no_app_upgrade"
      - "upgrade"