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

---
# Performs initial variable validation
- name: Fail when variables are not defined
  ansible.builtin.fail:
    msg: "The {{ item }} property must be set"
  when: ( vars[item] is not defined )
  with_items:
    - grafana_agent_version
    - grafana_agent_install_dir
    - grafana_agent_binary
    - grafana_agent_config_dir
    - grafana_agent_config_filename
    - grafana_agent_env_file
    - grafana_agent_local_tmp_dir
    - grafana_agent_wal_dir
    - grafana_agent_positions_dir
    - grafana_agent_mode
    - _grafana_agent_systemd_dir
    - _grafana_agent_systemd_unit
    - grafana_agent_user
    - grafana_agent_user_group
    - grafana_agent_user_shell
    - grafana_agent_user_createhome
    - grafana_agent_local_binary_file
    - grafana_agent_flags_extra
    - grafana_agent_env_vars
    - grafana_agent_env_file_vars
    - grafana_agent_provisioned_config_file
    - grafana_agent_metrics_config
    - grafana_agent_logs_config
    - grafana_agent_traces_config
    - grafana_agent_integrations_config

- name: Fail when variables do not have a length
  ansible.builtin.fail:
    msg: "The {{ item }} property must be valued"
  when: ( vars[item] | string | length == 0 )
  with_items:
    - grafana_agent_version
    - grafana_agent_install_dir
    - grafana_agent_binary
    - grafana_agent_config_dir
    - grafana_agent_config_filename
    - grafana_agent_env_file
    - grafana_agent_local_tmp_dir
    - grafana_agent_wal_dir
    - grafana_agent_positions_dir
    - grafana_agent_mode
    - _grafana_agent_systemd_dir
    - _grafana_agent_systemd_unit
    - grafana_agent_user
    - grafana_agent_user_group
    - grafana_agent_user_shell
    - grafana_agent_user_createhome

- name: Fail when variables are not a number
  ansible.builtin.fail:
    msg: "The {{ item }} property must be number"
  when: ( vars[item] is defined and vars[item] is not number)
  with_items: []

- name: Fail when flags are not a boolean
  ansible.builtin.fail:
    msg: "The {{ item }} property must be a boolean true or false"
  when: ( vars[item] | bool | string | lower ) not in ['true', 'false']
  with_items:
    - grafana_agent_user_createhome

- name: Fail when the agent mode is not "flow" or "static"
  ansible.builtin.fail:
    msg: "The grafana_agent_mode property must be a boolean 'flow' or 'static'"
  when: grafana_agent_mode not in ['flow', 'static']