xoxys.wireguard/tasks/main.yml

---
- name: Ensure dependencies are installed
  ansible.builtin.package:
    name: "{{ item }}"
    state: present
  loop:
    - wireguard-tools

- name: Stat WireGuard config file
  ansible.builtin.stat:
    path: "/etc/wireguard/{{ wireguard_interface }}.conf"
  register: __wireguard_config_file

- when:
    - not __wireguard_config_file.stat.exists
    - wireguard_private_key is not defined
  block:
    - name: Generate WireGuard private key
      ansible.builtin.command: "wg genkey"
      register: __wireguard_private_key_gen
      changed_when: False

    - name: Set generated private key
      ansible.builtin.set_fact:
        wireguard_private_key: "{{ __wireguard_private_key_gen.stdout }}"

- when:
    - __wireguard_config_file.stat.exists
    - wireguard_private_key is not defined
  block:
    - name: Read WireGuard config file
      ansible.builtin.slurp:
        src: "/etc/wireguard/{{ wireguard_interface }}.conf"
      register: __wireguard_config

    - name: Set existing private key
      ansible.builtin.set_fact:
        wireguard_private_key: "{{ __wireguard_config['content'] | b64decode | regex_findall('PrivateKey = (.*)') | first }}"

- name: Derive WireGuard public key
  ansible.builtin.command: "wg pubkey"
  args:
    stdin: "{{ wireguard_private_key }}"
  register: __wireguard_public_key_gen
  changed_when: False

- name: Set public key fact
  ansible.builtin.set_fact:
    __wireguard_public_key: "{{ __wireguard_public_key_gen.stdout }}"

- name: Generate WireGuard configuration file
  ansible.builtin.template:
    src: etc/wireguard/wg.conf.j2
    dest: "/etc/wireguard/{{ wireguard_interface }}.conf"
    owner: root
    group: root
    mode: "0600"
  notify: __wireguard_restart

- name: Ensure legacy reload-module-on-update is absent
  ansible.builtin.file:
    dest: "/etc/wireguard/.reload-module-on-update"
    state: absent

- name: Ensure WireGuard service is up and running
  ansible.builtin.service:
    name: "wg-quick@{{ wireguard_interface }}"
    daemon_reload: True
    enabled: True
    state: started