kubespray/roles/download/tasks/download_container.yml

---
- name: container_download | Make download decision if pull is required by tag or sha256
  include_tasks: set_docker_image_facts.yml
  when:
    - download.enabled
    - download.container
  tags:
    - facts

- block:
    - name: download_container | Set a few facts
      import_tasks: set_container_facts.yml
      run_once: "{{ download_run_once }}"
      tags:
        - facts

    - name: download_container | Determine if image is in cache
      stat:
        path: "{{ image_path_cached }}"
      delegate_to: localhost
      delegate_facts: no
      register: cache_image
      changed_when: false
      become: false
      when:
        - download_force_cache

    - name: download_container | Set fact indicating if image is in cache
      set_fact:
        image_is_cached: "{{ cache_image.stat.exists | default(false) }}"
      tags:
        - facts
      when:
        - download_force_cache

    - name: download_container | Upload image to node if it is cached
      synchronize:
        src: "{{ image_path_cached }}"
        dest: "{{ image_path_final }}"
        use_ssh_args: "{{ has_bastion | default(false) }}"
        mode: push
      delegate_facts: no
      register: upload_image
      failed_when: not upload_image
      run_once: "{{ download_run_once }}"
      until: upload_image is succeeded
      retries: 4
      delay: "{{ retry_stagger | random + 3 }}"
      when:
        - download_force_cache
        - image_is_cached
        - not download_localhost
        - ansible_os_family not in ["CoreOS", "Container Linux by CoreOS"]

    - name: download_container | Load image into docker
      shell: "{{ docker_bin_dir }}/docker load < {{ image_path_cached if download_localhost else image_path_final }}"
      delegate_to: "{{ download_delegate if download_run_once or inventory_hostname }}"
      run_once: "{{ download_run_once }}"
      register: container_load_status
      failed_when: container_load_status | failed
      become: "{{ user_can_become_root | default(false) or not (download_run_once and download_localhost) }}"
      when:
        - download_force_cache
        - image_is_cached
        - ansible_os_family not in ["CoreOS", "Container Linux by CoreOS"]

    - name: download_container | Prepare container download
      import_tasks: check_pull_required.yml
      run_once: "{{ download_run_once }}"
      when:
        - not download_always_pull

    - debug:
        msg: "XXX Pull required is: {{ pull_required }}"

    # NOTE: Pre-loading docker images will not prevent 'docker pull' from re-downloading the layers in that image
    # if a pull is forced. This is a known issue with docker. See https://github.com/moby/moby/issues/23684
    - name: download_container | Download image if required
      command: "{{ image_pull_command }} {{ image_reponame }}"
      delegate_to: "{{ download_delegate if download_run_once or inventory_hostname }}"
      delegate_facts: yes
      run_once: "{{ download_run_once }}"
      register: pull_task_result
      until: pull_task_result is succeeded
      delay: "{{ retry_stagger | random + 3 }}"
      retries: 4
      become: "{{ user_can_become_root | default(false) or not download_localhost }}"
      when:
        - pull_required | default(download_always_pull)

    # NOTE: image_changed is only valid if a pull is was needed or forced.
    - name: download_container | Check if image changed
      set_fact:
        image_changed: "{{ true if pull_task_result.stdout is defined and not 'up to date' in pull_task_result.stdout else false }}"
      run_once: true
      when:
        - download_force_cache
      tags:
        - facts

    - name: download_container | Save and compress image
      shell: "{{ docker_bin_dir }}/docker save {{ image_reponame }} | gzip -{{ download_compress }} > {{ image_path_cached if download_localhost else image_path_final }}"
      delegate_to: "{{ download_delegate if download_run_once or inventory_hostname }}"
      delegate_facts: no
      register: container_save_status
      failed_when: container_save_status.stderr
      run_once: true
      become: "{{ user_can_become_root | default(false) or not download_localhost }}"
      when:
        - download_force_cache
        - not image_is_cached or (image_changed | default(true))
        - ansible_os_family not in ["CoreOS", "Container Linux by CoreOS"]

    - name: download_container | Copy image to ansible host cache
      synchronize:
        src: "{{ image_path_final }}"
        dest: "{{ image_path_cached }}"
        use_ssh_args: "{{ has_bastion | default(false) }}"
        mode: pull
      delegate_facts: no
      run_once: true
      when:
        - download_force_cache
        - not download_localhost
        - not image_is_cached or (image_changed | default(true))
        - ansible_os_family not in ["CoreOS", "Container Linux by CoreOS"]

    - name: download_container | Remove container image from cache
      file:
        state: absent
        path: "{{ image_path_final }}"
      when:
        - not download_keep_remote_cache
        - ansible_os_family not in ["CoreOS", "Container Linux by CoreOS"]

  tags:
    - download