Hiera: Update classic Hiera function calls

This version is out of date. For current versions, see Puppet packages and versions.

The hiera, hiera_array, hiera_hash, and hiera_include functions are all deprecated, and will be removed in Puppet 6.

The lookup function is a complete replacement for all of these:

Hiera function Equivalent lookup call
hiera('secure_server') lookup('secure_server')
hiera_array('ntp::servers') lookup('ntp::servers', {merge => unique})
hiera_hash('users') lookup('users', {merge => hash}) or lookup('users', {merge => deep})
hiera_include('classes') lookup('classes', {merge => unique}).include

To make sure you’re ready for Puppet 6 and beyond, revise your Puppet modules to replace the hiera_* functions with lookup. This is purely to prepare for the future: you can adopt all of Hiera 5’s new features without updating these function calls.

While you’re revising, consider refactoring some code to use automatic class parameter lookup instead of functions — since automatic lookups can now do unique and hash merges, the hiera_array and hiera_hash functions aren’t as important as they used to be.

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