---

- name: Get current telegraf version
  shell: "/usr/local/bin/telegraf version || true"
  check_mode: no
  register: telegraf_version_cmd

- name: Download and unpack telegraf release
  unarchive:
    src: 'https://dl.influxdata.com/telegraf/releases/telegraf-{{ telegraf_version }}_linux_amd64.tar.gz'
    remote_src: true
    dest: /tmp
  when: telegraf_version not in telegraf_version_cmd.stdout

- name: Move telegraf to expected position
  command: 'mv /tmp/telegraf-{{ telegraf_version }}/usr/bin/telegraf /usr/local/bin/telegraf'
  when: telegraf_version not in telegraf_version_cmd.stdout

- name: Cleanup tmp folder
  file:
    dest: '/tmp/telegraf-{{ telegraf_version }}'
    state: absent
  when: telegraf_version not in telegraf_version_cmd.stdout

- name: Install systemd service
  copy:
    content: |
      [Unit]
      Description=Telegraf monitoring
      After=network-online.target
      Requires=network-online.target

      [Service]
      TimeoutStartSec=0
      TimeoutStopSec=0
      Restart=on-failure
      RestartSec=10
      SyslogIdentifier=telegraf
      ExecStart=/usr/local/bin/telegraf --config /etc/telegraf.conf

      [Install]
      WantedBy=multi-user.target
    dest: /etc/systemd/system/telegraf.service
  register: telegraf_service

- name: Enable systemd service
  systemd:
    name: telegraf
    enabled: true
    daemon_reload: true

- name: Write telegraf.conf file
  template:
    src: templates/telegraf.conf.j2
    dest: /etc/telegraf.conf 
    mode: 0600
    owner: root
  register: telegraf_config

- name: Restart systemd service
  systemd:
    name: telegraf
    state: restarted
  when: packer_build_name is not defined and (telegraf_service.changed or telegraf_config.changed)

...