grafana-ansible-collection/roles/grafana_agent/tasks/preflight/install.yaml

---
- name: Default to non-local install
  ansible.builtin.set_fact:
    __grafana_agent_local_install: false

- name: Fail when grafana_agent_local_binary_file is defined but the file doesn't exist
  when: grafana_agent_local_binary_file is defined and grafana_agent_local_binary_file | length > 0
  block:
    - name: Check if grafana_agent_local_binary_file exists
      ansible.builtin.stat:
        path: "{{ grafana_agent_local_binary_file }}"
      register: __grafana_agent_local_binary_check
      become: false
      delegate_to: localhost
      check_mode: false

    - name: Fail when the grafana_agent_local_binary_file does not exist
      ansible.builtin.fail:
        msg: "The grafana_agent_local_binary_file ({{ grafana_agent_local_binary_file }}) was specified but does not exist"
      when: not __grafana_agent_local_binary_check.stat.exists

    - name: Change to local install
      ansible.builtin.set_fact:
        __grafana_agent_local_install: true

- name: Fail when grafana_agent_provisioned_config_file is defined but the file doesn't exist
  when: grafana_agent_provisioned_config_file is defined and grafana_agent_provisioned_config_file | length > 0
  block:
    - name: Check if grafana_agent_provisioned_config_file exists
      ansible.builtin.stat:
        path: "{{ grafana_agent_provisioned_config_file }}"
      register: __grafana_agent_provisioned_config_file_check
      become: false
      delegate_to: localhost
      check_mode: false

    - name: Fail when the grafana_agent_provisioned_config_file does not exist
      ansible.builtin.fail:
        msg: "The grafana_agent_provisioned_config_file ({{ grafana_agent_provisioned_config_file }}) was specified but does not exist"
      when: not __grafana_agent_provisioned_config_file_check.stat.exists

- name: Check if grafana_agent is already installed on the host
  ansible.builtin.stat:
    path: "{{ grafana_agent_install_dir }}/{{ grafana_agent_binary }}"
  register: __grafana_agent_is_installed
  check_mode: false

- name: Is Grafana Agent already installed on the host
  ansible.builtin.debug:
    var: __grafana_agent_is_installed.stat.exists

- name: Install checks
  when: __grafana_agent_is_installed.stat.exists and not __grafana_agent_local_install
  block:
    - name: Gather currently installed grafana-agent version from the host
      ansible.builtin.shell:
        cmd: |
          {{ grafana_agent_install_dir }}/{{ grafana_agent_binary }} --version | \
            head -n 1 | \
            awk '{ print $3; }' | \
            cut -d 'v' -f 2
      changed_when: false
      register: __grafana_agent_current_version_output
      check_mode: false

    - name: Set Grafana Agent installed version for the host
      ansible.builtin.set_fact:
        __grafana_agent_installed_version: "{{ __grafana_agent_current_version_output.stdout }}"

    - name: Grafana Agent installed version on host
      ansible.builtin.debug:
        var: __grafana_agent_installed_version