---
- name: Create node_exporter group
  group:
    name: "{{ node_exporter_system_group }}"
    state: present
    system: true
  when: node_exporter_system_group != "root"

- name: Create node_exporter user
  user:
    name: "{{ node_exporter_system_user }}"
    group: "{{ node_exporter_system_group }}"
    groups: "{{ node_exporter_system_group }}"
    append: true
    shell: /usr/sbin/nologin
    system: true
    create_home: false
    home: /

- name: Get latest node_exporter version
  github_release:
    user: prometheus
    repo: node_exporter
    action: latest_release
    token: "{{ vault_github_token }}"
  delegate_to: localhost
  run_once: true
  register: node_exporter_version
- name: "{{ node_exporter_version }}"
  set_fact:
    node_exporter_version: "{{ node_exporter_version | replace('v', '', 1) | trim }}"
  run_once: true

- name: Set architecture alias
  set_fact:
    architecture_alias: "amd64"  # noqa: var-naming[no-role-prefix]
  when: ansible_architecture == "x86_64"

- name: Set architecture alias
  set_fact:
    architecture_alias: "arm64"  # noqa: var-naming[no-role-prefix]
  when: ansible_architecture == "aarch64"

- name: "Download node_exporter from GitHub"
  get_url:
    url: "https://github.com/prometheus/node_exporter/releases/download/\
          v{{ node_exporter_version.tag }}/node_exporter-{{ node_exporter_version.tag }}\
          .linux-{{ architecture_alias }}.tar.gz"
    dest: "/var/tmp/node_exporter.tar.gz"
    mode: "0644"
  register: node_exporter_download_archive
  until: node_exporter_download_archive is succeeded
  retries: 3
  delay: 5

- name: Unpack node_exporter
  unarchive:
    remote_src: true
    src: "/var/tmp/node_exporter.tar.gz"
    dest: "{{ node_exporter_install_dir }}"
    owner: "{{ node_exporter_system_user }}"
    group: "{{ node_exporter_system_group }}"
    extra_opts:
      - --strip-components=1
    include:
      - "node_exporter-{{ node_exporter_version.tag }}.linux-{{ architecture_alias }}/node_exporter"
  notify: Restart node_exporter

- name: Copy node_exporter systemd service
  template:
    src: node_exporter.service.j2
    dest: /etc/systemd/system/node_exporter.service
    owner: root
    group: root
    mode: "0644"
  notify: Restart node_exporter