I faced the same problem. I tried Nick Groenen's code and it doesn't work when the params is like this: ``` foo: ``` in this case, foo is define and foo == none
And it doesn't work when foo: ' ' This is what I came up with: not((foo is undefined) or (foo is none) or (foo|trim == '')) Not sure if there is any build-in function that implement similar logic. Cheers Leo Liang 在 2014年1月31日星期五 UTC+11下午10:58:17，Stephen Ryan写道： > > > > Best to explain with an example > > We have tasks setup like > > - name: do something > shell: do task > when: foo is defined > > This works perfectly for most situations however we have a number of > places where we need to unset the variable to stop the command on certain > hosts. Neither of the following work when set in the group vars and result > in the task working. > > foo: > foo: "" > > So my question is how would one normally unset a variable like this or > correctly test for it. Jinja docs suggest its just an "if variable" [1], so > "when: foo" but that doesn't work whenever the variable has a value > > fatal: [127.0.0.1] => error while evaluating conditional: foo > > The closest I've gotten is > when: foo is defined and foo is string > but this feels wrong and there is no reference to using an "is string" > check in the ansible docs. > > [1] http://jinja.pocoo.org/docs/templates/#if > -- You received this message because you are subscribed to the Google Groups "Ansible Project" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/ansible-project/ddf14bf5-1ba9-44cb-9367-63acc775314c%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
