ansible/test/integration/targets/hostname/tasks/main.yml

# Setting the hostname in our test containers doesn't work currently
- when: ansible_facts.virtualization_type != 'docker'
  block:
    - name: Include distribution specific variables
      include_vars: "{{ lookup('first_found', params) }}"
      vars:
        params:
          files:
            - "{{ ansible_facts.distribution }}.yml"
            - "{{ ansible_facts.os_family }}.yml"
            - default.yml
          paths:
            - "{{ role_path }}/vars"

    - name: Get current hostname
      command: hostname
      register: original

    - name: Run hostname module in check_mode
      hostname:
        name: crocodile.ansible.test.doesthiswork.net.example.com
      check_mode: true
      register: hn1

    - name: Get current hostname again
      command: hostname
      register: after_hn

    - assert:
        that:
          - hn1 is changed
          - original.stdout == after_hn.stdout

    - when: _hostname_file is defined and _hostname_file
      block:
        - name: See if current hostname file exists
          stat:
            path: "{{ _hostname_file }}"
          register: hn_stat

        - name: Move the current hostname file if it exists
          command: mv {{ _hostname_file }} {{ _hostname_file }}.orig
          when: hn_stat.stat.exists

        - name: Run hostname module in check_mode
          hostname:
            name: crocodile.ansible.test.doesthiswork.net.example.com
          check_mode: true
          register: hn

        - stat:
            path: /etc/rc.conf.d/hostname
          register: hn_stat_checkmode

        - assert:
            that:
              # TODO: This is a legitimate bug and will be fixed in another PR.
              # - not hn_stat_checkmode.stat.exists
              - hn is changed

        - name: Get hostname again
          command: hostname
          register: current_after_cm

        - assert:
            that:
              - original.stdout == current_after_cm.stdout

    - name: Run hostname module for real now
      hostname:
        name: crocodile.ansible.test.doesthiswork.net.example.com
      register: hn2

    - name: Get hostname
      command: hostname
      register: current_after_hn2

    - name: Run hostname again to ensure it is idempotent
      hostname:
        name: crocodile.ansible.test.doesthiswork.net.example.com
      register: hnidem

    - name: Get hostname
      command: hostname
      register: current_after_hnidem

    - assert:
        that:
          - hn2 is changed
          - hnidem is not changed
          - current_after_hn2.stdout == 'crocodile.ansible.test.doesthiswork.net.example.com'
          - current_after_hn2.stdout == current_after_hnidem.stdout

    - name: Include distribution specific tasks
      include_tasks:
        file: "{{ lookup('first_found', files) }}"
      vars:
        files:
          - "{{ ansible_facts.distribution }}.yml"
          - default.yml
  always:
    # Reset back to original hostname
    - name: Move back original file if it existed
      command: mv -f {{ _hostname_file }}.orig {{ _hostname_file }}
      when: hn_stat is defined and hn_stat.stat.exists

    - name: Delete the file if it never existed
      file:
        path: "{{ _hostname_file }}"
        state: absent
      when: hn_stat is defined and not hn_stat.stat.exists

    # Reset back to original hostname
    - hostname:
        name: "{{ original.stdout }}"
      register: revert

    # And make sure we really do
    - assert:
        that:
          - revert is changed