Jira (HI-467) Special handling of 'classes' key in data

Henrik Lindberg (JIRA) Mon, 07 Sep 2015 19:08:00 -0700

Title: Message Title

HI-467

Note that hiera_include is a very thin convenience function that you do not have to use to get what you want. You can do lookups using different merge strategies hiera_array or hiera_hash, and instead call include yourself. With Puppet 4.x (and 3.x with future parser) you can also easily loop over entires, or do transformations of what is returned - delete some of the entries etc.

This is what hiera_include actually does:

include(hiera('classes'))

Or if you want to use iteration:

hiera('classes').each |$c| { include c }

If you want to remove some classes:

include(hiera('classes') - hiera('remove_classes'))

Examples all with "future parser", and the last assumes that 'remove_classes' always returns an array (it can be empty).
The examples above should be easy to modify to use hiera_array and a merge strategy instead of the standard priority lookup.

Also look at the lookup function for more features regarding lookup, merges, and knock_out of values (ie. what is asked for in HI-128).

Note that with Puppet 4.x you can write your own function using the puppet language - e.g:

function myorg::classes_from_hiera() {

  lookup('classes', Array) - lookup('remove_classes', Array))

# and use it like this

include myorg::classes_from_hiera()

Or something similar...

I do not see us adding the above functionality and flexibility for hiera 'classes' when it is trivially constructed out of general purpose building blocks. I am therefore closing this ticket as a "won't fix".

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Jira (HI-467) Special handling of 'classes' key in data

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