ansible-playbooks/roles/coredns/tasks/increase_serial.yml

- name: fail if zone is not defined
  fail:
    msg: zone is not defined
  when: zone is not defined


- name: slurp zone file
  slurp:
    src: "{{ (coredns_conf_dir, zone ~ '.zone') | path_join }}"
  register: zf
  changed_when: no


- name: get SOA serial value
  set_fact:
    ns_old_serial: '{{ zf.content | b64decode | regex_search(''@\s+IN\s+SOA\s+\S+\s+\S+\s*\(\s*(\d+)'', ''\1'') | first | string }}'


- name: get current date
  include_tasks: tasks/get_datetime.yml
  vars:
    format: YYMMDD


- name: replace outdated serial with current date
  set_fact:
    ns_new_serial: "{{ (current_date_time | string) ~ '01'}}"
  when: ns_old_serial[:8] != (current_date_time | string)


- name: increase current serial
  set_fact:
    ns_new_serial: "{{ (ns_old_serial | int) + 1 }}"
  when: (ns_old_serial[:8] == (current_date_time | string)) and ((ns_old_serial[8:10] | int) < 99)


- name: do not change current serial if it had more than 99 iterations
  set_fact:
    ns_new_serial: "{{ ns_old_serial }}"
  when: (ns_old_serial[:8] == (current_date_time | string)) and ((ns_old_serial[8:10] | int) >= 99)


- name: insert new serial
  replace:
    path: "{{ (coredns_conf_dir, zone ~ '.zone') | path_join }}"
    regexp: '(@\s+IN\s+SOA\s+\S+\s+\S+\s*\(\s*){{ ns_old_serial }}'
    replace: '\g<1>{{ ns_new_serial }}'
  register: result


- name: set fact if serial was changed
  set_fact:
    ns_serial_changed: "{{ result.changed }}"