okd/roles/openshift_etcd_facts/tasks/set_etcd_ca_host.yml

---
- name: Check for CA indicator files
  stat:
    path: "{{ item.0 }}"
  delegate_to: "{{ item.1 }}"
  with_nested:
  - - /etc/etcd/ca
    - /etc/etcd/generated_certs
  - "{{ groups[etcd_ca_host_group] }}"
  register: __etcd_ca_host_stat
  run_once: true

# Collect ansible_host (inventory hostname) of hosts with /etc/etcd/ca
# and /etc/etcd/generated_certs directories.
- set_fact:
    __etcd_ca_dir_hosts: "{{ __etcd_ca_host_stat.results
                             | lib_utils_oo_collect('_ansible_delegated_vars.inventory_hostname',
                                                    filters={'stat.path':'/etc/etcd/ca','stat.exists':True}) }}"
    __etcd_generated_certs_dir_hosts: "{{ __etcd_ca_host_stat.results
                                          | lib_utils_oo_collect('_ansible_delegated_vars.inventory_hostname',
                                                                 filters={'stat.path':'/etc/etcd/generated_certs','stat.exists':True}) }}"
  run_once: true

# __etcd_ca_hosts is the intersection of hosts which have /etc/etcd/ca
# and /etc/etcd/generated_certs directories.
- set_fact:
    __etcd_ca_hosts: "{{ __etcd_ca_dir_hosts | intersect(__etcd_generated_certs_dir_hosts) }}"
  run_once: true

# __etcd_ca_hosts should only contain one host. If more than one host
# is able to be an etcd CA host then we will use the first.
- set_fact:
    etcd_ca_host: "{{ __etcd_ca_hosts[0] }}"
  when:
  - __etcd_ca_hosts | length > 0
  - etcd_ca_host is not defined

# No etcd_ca_host was found in __etcd_ca_hosts. This is probably a
# fresh installation so we will default to the first member of the
# etcd host group.
- set_fact:
    etcd_ca_host: "{{ groups[etcd_ca_host_group].0 }}"
  when:
  - etcd_ca_host is not defined