Nested interpolation

[Helmut Schneider]

Hi,

I'm using something like this:

netconfig:
hostname: 'BSDHelmut'
interfaces:
"%{facts.networking.primary}":
ip4: &ip4 '192.168.124.35'
cidr4: &cidr4 '192.168.124.35/24'
ip4aliases:
- '192.168.124.36/32'
ip6: &ip6 'DHCP'

Can I either do something like

- "%{lookup('netconfig.interfaces.%{facts.networking.primary}.ip4.helmut')}"
- "text*{ip4}text"

Thank you!

[Henrik Lindberg]

No, you cannot do nested interpolations in hiera directly like that.

You would need to write your own hiera backend function to do that kind
of combined lookup. It is easier than it sounds.

An alternative to using your own is to use this function as a backend:
https://github.com/hlindberg/tahu/blob/master/lib/puppet/functions/tahu/ppyaml_key.rb

It allows you to write snippets of Puppet Language logic in your data
files - thus you can do puppet language interpolation and lookup the
result as a key.

- henrik

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