On 2014-11-07 16:38, Chris Cowley wrote:
OK, so what it the recommended way to do this? Somehow it is not
something I have come up against before, I have the impression that it
is a lot harder than simply:
if $variable {
do stuff
}
In version before Puppet 4.0.0 the values as boolean map like this:
"falsey": empty string, false, undef
"truthy": everything else
In Puppet 4.0.0 this will be:
"falsey": false, undef
"truthy": everything else
In Puppet < 4.0.0, an undef is considered to be equal (==) to an empty
string. In 4.0.0 this will no longer be the case and only undef is undef
when comparing and checking equality.
Thus, if you want to check if a value is undef (but you do not want to
match empty strings) you must jump through hoops to do this using
something that does not equate undef with "", such as the 'in' operator.
(Note that the undefined value must be placed in the array, it cannot
appear on the left hand side as this raises an error the left side is
not a String (in versions before 4.0.0).
if $x == undef and !("" in [$x])
# do something, $x is undef and not deliberately set to empty string
end
This will continue to work in 4.0.0 (even if undef and "" are not
considered to be the same. (The reason this works is because there are
bugs in the implementation of "in" that does not equate undef with "") -
that behavior will not be changed.
Regards
- henrik
I've had a look through stdlib and it does not seem to have anything
that helps here (if that is the case, then I will make a feature request).
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