---
- name: Ensure destination directory exists
  file:
    state: directory
    path: "{{ image_download_dest | dirname }}"

- block:
    - block:
        - name: Fail if the checksum algorithm is not set
          fail:
            msg: "Checksum algorithm for image {{ image_download_url }} not set"
          when: image_download_checksum_algorithm is falsy

        - name: Get the expected checksum
          uri:
            url: "{{ image_download_checksum_url }}"
            return_content: true
          register: expected_checksum
          until: expected_checksum is successful
          retries: 3
          delay: 5
      when:
        - image_download_checksum_url is truthy

    - name: Ensure the image is downloaded
      vars:
        # NOTE(wszumski): This is evaluated even when expected_checksum is skipped
        checksum: "{{ image_download_checksum_algorithm }}:{{ expected_checksum.content.split(' ')[0] if 'content' in expected_checksum else '' }}"
      get_url:
        url: "{{ image_download_url }}"
        dest: "{{ image_download_dest }}"
        mode: 0640
        # If the file exists locally, its checksum will be compared with this.
        checksum: "{{ checksum if expected_checksum is not skipped else omit }}"
        # Always download the image if we have no checksum to compare with.
        force: "{{ expected_checksum is skipped }}"
        backup: true
      register: result
      until: result is successful
      retries: 3
      delay: 5
  when:
    - image_download_url is truthy

- when: image_download_path is truthy
  block:
    - name: Ensure the local image is copied
      copy:
        src: "{{ image_download_path }}"
        dest: "{{ image_download_dest }}"
        mode: 0640
      when:
        - image_download_host is falsy

    - name: Ensure the remote image is fetched
      fetch:
        src: "{{ image_download_path }}"
        dest: "{{ image_download_dest }}"
        mode: 0640
        flat: true
      when:
        - image_download_host is truthy
      delegate_to: "{{ image_download_host | default('localhost', true) }}"
      vars:
        # NOTE: Without this, the hosts's ansible_host variable will not be
        # respected when using delegate_to.
        ansible_host: "{{ hostvars[image_download_host].ansible_host | default(image_download_host) }}"