On Friday, September 18, 2015 at 4:36:32 PM UTC-5, Joao Morais wrote:
>
>
> Hello list. I am using the hiera() lookup function in order to query
> some few attributes from a http backend. Something like this:
>
> common.yaml
> ---
> ...
> class::attr: "%{hiera('other::attr')}"
>
> This works very well if other::attr is defined, but an empty string is
> returned in the lookup above if the other::attr isn't found. The hiera()
> function on the manifest fails the compilation if I do the same query,
> which is what I'd expect from the lookup above.
>
You have a misconception, albeit an understandable one: the Puppet function
hiera() is not the same as the Hiera interpolation function of the same
name. The two perform very similar work, but there is no inherent reason to
suppose that they must operate identically. Their interfaces are not even
quite the same (at least as far as their documentation says), for the
Puppet function accepts up to three arguments, whereas the Hiera function
documents only one.
>
> Is there a way to enforce the declaration of the other::attr when using
> hiera() lookup function inside the hieradata?
>
>
No such mechanism is documented. You could file a feature request, but
inasmuch as there may be sites that knowingly or unknowingly depend on the
current behavior, I judge it unlikely that such a feature request would be
accepted. Perhaps PL would be more receptive if you structured the request
as an extension rather than as a behavior change -- an alternative lookup
function, for example, or an additional argument to the existing one.
For now, perhaps you could instead put a throwaway call to the Puppet
hiera() function in an appropriate manifest, so as to force compilation
failure *there* in the event that the wanted key is not defined.
John
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