Data interpoliation

[glisignoli]

Reading the Hiera 5 docs, it looks like I can use data interpolation to have fact lookups inside a hiera data source (https://puppet.com/docs/puppet/5.0/hiera_interpolation.html).

This doesn't seem to work with hiera-http, eg:

At the moment I am trying to do a simple test of:

class foo (
  $bar = lookup("some::path::var")
) {
  notify { 'bar':
    message => $bar
  }
}

Couchdb:

{
  "some::path::var": "%{::fqdn}"
}

But my notify output is always:

Notice: /Stage[main]/Foo::Notify[bar]/message:current_value absent, should be %{::fqdn} (noop)

Any ideas why this isn't getting resolved as the fqdn fact?

[LongLiveCHIEF]

The interpolation is done in the data source file, not in the returned data itself.

[glisignoli]

Data interpolation is a feature of hiera, but requires either the hiera backend to be developed as a data_hash plugin, or by calling context.interpolate on the values before returning them. #74 enables this, however I don't know how to write the test cases.

[crayfishx]

+1 to what @glisignoli said - this is something I was planning on adding in - so thanks for the contribution I'll merge this shortly....

[crayfishx]

Released as 3.4.0