- name: Check locales
  shell: "grep -c '^ru_RU.KOI8-R' /etc/locale.gen || :"
  register: has_locales
  changed_when: has_locales.stdout == "0"

- debug:
    msg: "Locales have already been configured"
  when: has_locales.stdout != "0"

- block:
    - name: Configure locales
      become: true
      lineinfile:
        path: /etc/locale.gen
        regexp: "^{{ item }}"
        line: "{{ item }}"
      loop: [
          'en_US ISO-8859-1',
          'ru_RU.KOI8-R KOI8-R',
          'ru_RU.UTF-8 UTF-8',
      ]
    - name: Regenerate locales
      become: true
      command: /usr/sbin/locale-gen
  when: has_locales.stdout == "0"