On 14.02.2018 11:03, jn.be...@gmail.com wrote:
Another approach:

- name: check required vars
  fail: msg="Variable '{{ item }}' is not defined"
  when: item not in vars
  with_items: "{{required_vars}}"

Workes, but you cannot check the value of the variable, just if it is not
undefined.

This should work

when: vars[item] is not defined or vars[item] == ""

--
Kai Stian Olstad

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