@Micheal, in your case having the extra moustaches ({{ }}) would cause
unwanted double interpolation, @Rich is actually using that on
purpose. So the warning was valid in your case, but not his.
For templating there are mainly 2 rules (though 2nd is actually
consequence of the first):
- moustaches don't stack: {{ {{ }} }} <= you should not use tempating
inside templating, normally you want contactenation or hostvars[]
- Always use moustaches except when `when:` <= conditionals are
'expressions' so they already have an implied template which then hits
rule #1
----------
Brian Coca
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