---
- name: "Install | Check if node_exporter is accessible from $PATH"
  changed_when: false
  failed_when: false
  register: cmd_node_exporter
  ansible.builtin.command:
    cmd: node_exporter --version

- name: "Install | Build the exporter name"
  when: "node_exporter_ver not in cmd_node_exporter.stdout"
  ansible.builtin.set_fact:
    prom_exp_name: "/node_exporter-{{ node_exporter_ver }}\
      .{{ ansible_system | lower }}-\
      {{ (ansible_architecture == 'x86_64') | ternary('amd64', ansible_architecture) }}"

- name: "Install | Download the node_exporter binary (release {{ node_exporter_ver }})"
  when: "node_exporter_ver not in cmd_node_exporter.stdout"
  ansible.builtin.unarchive:
    src: "\
      https://github.com/prometheus/node_exporter/releases/download/\
      v{{ node_exporter_ver }}\
      {{ prom_exp_name }}\
      .tar.gz"
    dest: /tmp
    remote_src: true

- name: "Install | Install the downloaded binary to '{{ node_exporter_bin_path }}'"
  when: "node_exporter_ver not in cmd_node_exporter.stdout"
  changed_when: false
  ansible.builtin.command:
    cmd: install /tmp/{{ prom_exp_name }}/node_exporter -t {{ node_exporter_bin_path }}

- name: "Install | Push the service file template"
  ansible.builtin.template:
    src: node_exporter.service.j2
    dest: /usr/lib/systemd/system/node_exporter.service
    mode: "0660"