vars:
  THISUSER: "{{ lookup('env','LOGNAME') }}"
  SSHPWD:   "{{ lookup('env','MY_PWD') }}"

vars_prompt:
  - name: "release_version"
    prompt: "Product release version"
    default: "1.0"
    when: SSHPWD == null

echo -n | ansible-playbook -e MyVar=blih site.yaml

---
- hosts: localhost
  vars_prompt:
    - prompt: Enter blah value
    - default: "{{ my_blah }}"
    - name: blah

---
- pause:
      prompt: "Sudo password for localhost "
  when: ( env == 'local' ) and
      ( inventory_hostname == "localhost" ) and
      ( hostvars["localhost"]["ansible_become_password"] is not defined )
  register: sudo_password
  no_log: true
  tags:
       - always