---
- name: Decide whether we need to build images
  hosts: undercloud
  vars:
    # We always want to build images when we have changes in this
    # list becuase these repos can affect the image building itelf
    # This list is overridable via the "always_build_list" var if
    # needed.
    default_projects_need_build_list:
      - diskimage-builder
      - tripleo-image-elements
      - tripleo-puppet-elements
      - instack-undercloud
      - python-tripleoclient
      - tripleo-common
  tasks:
    # The next two tasks make the list of ZUUL_CHANGES look like our build list
    # after we cleanup the extra stuff there, we can just intersect the two
    # lists in order to match.
    - name: Cleanup front of ZUUL_CHANGES
      set_fact:
        zuul_changes: "{{ lookup('env', 'ZUUL_CHANGES')|regex_replace('openstack/', '') }}"

    - name: Cleanup end of ZUUL_CHANGES
      set_fact:
        zuul_changes: "{{ zuul_changes|regex_replace(':[a-z]*:refs/changes/\\d{2}/\\d{6}/\\d{1}','') }}"

    - name: Split zuul_changes to a list
      set_fact:
        zuul_changes: "{{ zuul_changes.split('^') }}"

    - name: compare zuul_changes list to our always_build_list
      set_fact:
        projects_need_build: "{{ zuul_changes | intersect(projects_need_build_list|default(default_projects_need_build_list)) }}"

    - name: Default to using cached images
      set_fact:
        to_build: false
        cacheable: true

    - name: Build images when we have a change in the always build list
      set_fact:
        to_build: true
        cacheable: true
      when: projects_need_build != []

    - name: Always build images in the periodic jobs
      set_fact:
        to_build: true
        cacheable: true
      when: "{{ lookup('env', 'PERIODIC')|default('0')|int == 1 }}"