---
- name: add repository key
  copy:
    src: repo.gpg
    dest: /etc/apt/trusted.gpg.d/kubernetes.gpg
  register: apt_repo_kubernetes_key

- name: add repository entry
  copy:
    content: |
      deb https://apt.kubernetes.io/ kubernetes-xenial main
    dest: /etc/apt/sources.list.d/kubernetes.list
  register: apt_repo_kubernetes_sources

- name: update apt cache
  when: apt_repo_kubernetes_key is changed or
        apt_repo_kubernetes_sources is changed
  apt:
    update_cache: yes