On Friday, April 19, 2013 8:49:14 AM UTC-5, blalor wrote:
>
> On Apr 19, 2013, at 9:34 AM, jcbollinger <john.bo...@stjude.org<javascript:>>
> wrote:
>
> Moreover, I wanted to point out that, contrary to Brian's implication,
> automated class parameter binding is independent of whether parameters have
> explicit default values. If you do not bind a parameter's value via a
> class's declaration (and you shouldn't) then Puppet attempts to look up a
> value for it via hiera, regardless of whether an explicit default value is
> declared by the class. Only if the hiera lookup fails is an explicit
> default used.
>
>
> That's kind of cool.
>
> class foo (
> $bar => hiera('baz', 'bap'),
> ) { }
>
> So $bar will be set to "bap" only if foo::bar and baz are not found in
> Hiera, in that order?
>
>
I had to study that for a minute to see what you meant, but yes, that is
correct for Puppet 3. Puppet 2 will differ. Puppet 3 may perform both
lookups even when foo::bar is found, however, even though in that case it
doesn't use the result of the 'baz' lookup. That could be significant
under some circumstances, such as when using an Hiera back-end that is
expensive to call.
John
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