kubernetes-the-hard-way/check_local_prerequisites.yml

---

- name: Prerequisites | required commands are installed and in PATH
  shell: command -v {{ item }} >/dev/null 2>&1
  ignore_errors: yes
  with_items:
  - vagrant
  - cfssl
  - cfssljson
  - kubectl
  register: localhost_has_required_commands


- name: Prerequisites | instructions
  assert:
    that: "{{ 'failed' not in localhost_has_required_commands }}"
    fail_msg: "you need to install the following commands: {{ localhost_has_required_commands.results | selectattr('failed', 'sameas', true) | list | map(attribute='item') | list | join(',')}}" 


- name: Prerequisites | set_fact
  set_fact: 
    local_prerequisites_met: "{{ 'failed' not in localhost_has_required_commands }}"