On 10/01/2010 02:30 PM, Héctor Rivas Gándara wrote:
>> How can I check wether a parameter is defined or not. For instance a
>> function that would fail (with a parser error) if the variable is not
>> defined:
>>
>> check_defined($avar) or check_defined("$avar")
>
> I answer myself, one way would be:
>
> if $avar == undef { fail("'avar' not defined") }
>
> I think that assertions would be even better:
>
> assert($avar != undef)
>
> or
> assert($avar)
>
>
> I think that add assertions would be a good idea. They could check
> True/False conditions, if variables are defined or not, if objects are
> defined... Is there any proposal about this?
I think the problem with such things is that they are dependent on the
order puppet evaluates the catalogue in, which is undefined. See
http://docs.puppetlabs.com/references/stable/function.html#defined
which does what you propose wrt. resources. An assert would be
if !defined(Resource[...]) { fail "message" }
but should not be used due to the order limitation.
Regards,
Felix
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