ansible-loki-role/tasks/preflight.yml

---
- name: Assert usage of systemd as an init system
  assert:
    that: ansible_service_mgr == 'systemd'
    msg: "This module only works with systemd"

- block:
    - name: Get latest release
      uri:
        url: "https://api.github.com/repos/grafana/loki/releases/latest"
        method: GET
        return_content: true
        status_code: 200
        body_format: json
        validate_certs: false
        user: "{{ lookup('env', 'GH_USER') | default(omit) }}"
        password: "{{ lookup('env', 'GH_TOKEN') | default(omit) }}"
      no_log: "{{ not lookup('env', 'ANSIBLE_DEBUG') | bool }}"
      register: _latest_release
      until: _latest_release.status == 200
      retries: 5

    - name: Set loki version to {{ _latest_release.json.tag_name[1:] }}
      set_fact:
        loki_version: "{{ _latest_release.json.tag_name[1:] }}"
  when:
    - loki_version == "latest"
    - loki_binary_local_dir | length == 0

- block:
    - name: Get checksum list
      set_fact:
        __loki_checksums: "{{ lookup('url', 'https://github.com/grafana/loki/releases/download/v' + loki_version + '/SHA256SUMS', wantlist=True, follow_redirects='yes') | list }}"
      run_once: true

    - name: Get checksum for bins
      set_fact:
        __loki_bins_checksum: "{{ __loki_bins_checksum | default({}) | combine({item[1]: item[0].split()[0]}) }}"
      loop: "{{ lookup('nested', __loki_checksums, loki_bins, wantlist=True) }}"
      when:
        - "(item[1] + '-linux-' + go_arch + '.zip') in item[0].split()[1]"
  delegate_to: localhost
  when:
    - loki_binary_local_dir | length == 0