iiab/roles/postgresql/tasks/main.yml

# "How do i fail a task in Ansible if the variable contains a boolean value?
# I want to perform input validation for Ansible playbooks"
# https://stackoverflow.com/questions/46664127/how-do-i-fail-a-task-in-ansible-if-the-variable-contains-a-boolean-value-i-want/46667499#46667499

# We assume 0-init/tasks/validate_vars.yml has DEFINITELY been run, so no need
# to re-check whether vars are defined here.  As Ansible vars cannot be unset:
# https://serverfault.com/questions/856729/how-to-destroy-delete-unset-a-variable-value-in-ansible

- name: Assert that "postgresql_install is sameas true" (boolean not string etc)
  assert:
    that: postgresql_install is sameas true
    fail_msg: "PLEASE SET 'postgresql_install: True' e.g. IN: /etc/iiab/local_vars.yml"
    quiet: yes

- name: Assert that "postgresql_enabled | type_debug == 'bool'" (boolean not string etc)
  assert:
    that: postgresql_enabled | type_debug == 'bool'
    fail_msg: "PLEASE GIVE VARIABLE 'postgresql_enabled' A PROPER (UNQUOTED) ANSIBLE BOOLEAN VALUE e.g. IN: /etc/iiab/local_vars.yml"
    quiet: yes

- debug:
    var: postgresql_install
- debug:
    var: postgresql_enabled
- debug:
    var: postgresql_installed


- name: Install PostgreSQL if 'postgresql_installed' not defined, e.g. in {{ iiab_state_file }}    # /etc/iiab/iiab_state.yml
  include_tasks: install.yml
  when: postgresql_installed is undefined


- name: Enable & Start 'postgresql-iiab' systemd service, if postgresql_enabled
  systemd:
    name: postgresql-iiab
    daemon_reload: yes
    enabled: yes
    state: started
  when: postgresql_enabled

- name: Disable & Stop 'postgresql-iiab' systemd service, if not postgresql_enabled
  systemd:
    name: postgresql-iiab
    enabled: no
    state: stopped
  when: not postgresql_enabled


- name: Add 'postgresql' variable values to {{ iiab_ini_file }}
  ini_file:
    path: "{{ iiab_ini_file }}"    # /etc/iiab/iiab_state.yml
    section: postgresql
    option: "{{ item.option }}"
    value: "{{ item.value | string }}"
  with_items:
    - option: name
      value: PostgreSQL
    - option: description
      value: '"PostgreSQL is a powerful, open source object-relational database system."'
    - option: install
      value: "{{ postgresql_install }}"
    - option: enabled
      value: "{{ postgresql_enabled }}"