okd/playbooks/common/openshift-cluster/upgrades/initialize_nodes_to_upgrade.yml

---
- name: Filter list of nodes to be upgraded if necessary
  hosts: oo_first_master
  tasks:
  - name: Retrieve list of openshift nodes matching upgrade label
    command: >
      {{ openshift.common.client_binary }}
      get nodes
      --config={{ openshift.common.config_base }}/master/admin.kubeconfig
      --selector={{ openshift_upgrade_nodes_label }}
      -o jsonpath='{.items[*].metadata.name}'
    register: matching_nodes
    changed_when: false
    when: openshift_upgrade_nodes_label is defined

  - set_fact:
      nodes_to_upgrade: "{{ matching_nodes.stdout.split(' ') }}"
    when: openshift_upgrade_nodes_label is defined

  # We got a list of nodes with the label, now we need to match these with inventory hosts
  # using their openshift.common.hostname fact.
  - name: Map labelled nodes to inventory hosts
    add_host:
      name: "{{ item }}"
      groups: temp_nodes_to_upgrade
      ansible_ssh_user: "{{ g_ssh_user | default(omit) }}"
      ansible_become: "{{ g_sudo | default(omit) }}"
    with_items: " {{ groups['oo_nodes_to_config'] }}"
    when: openshift_upgrade_nodes_label is defined and hostvars[item].openshift.common.hostname in nodes_to_upgrade
    changed_when: false

  # Build up the oo_nodes_to_upgrade group, use the list filtered by label if
  # present, otherwise hit all nodes:
  - name: Evaluate oo_nodes_to_upgrade
    add_host:
      name: "{{ item }}"
      groups: oo_nodes_to_upgrade
      ansible_ssh_user: "{{ g_ssh_user | default(omit) }}"
      ansible_become: "{{ g_sudo | default(omit) }}"
    with_items: "{{ groups['temp_nodes_to_upgrade'] | default(groups['oo_nodes_to_config']) }}"