Is there a way to require a variable be defined for a playbook or role?

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1

Is there a way to specify a variable as “required”? E.g. a parameter for a role that must be set?

(Other than inserting a fail task when the variable is not defined.)

David

2

There isn’t, though this will work just fine:

fail: msg=‘missing required variables’
when: not (foo is defined and bar is defined and baz is defined)