Jira (PUP-7428) Implement knockout prefix for unique lookups

Matthias Baur (JIRA) Fri, 21 Apr 2017 01:16:15 -0700

Title: Message Title

PUP-7428

Sure, happy to help. We use the lookup() function for getting all client classes. Sometimes the hierarchy makes it necessary to remove the class in a higher level.

Simple example:

hiera.yaml:

---

version: 5

defaults:

  data_hash: yaml_data

  datadir: data

hierarchy:

  - name: "Customer node"

    paths:

      - "%{::trusted.extensions.customer}/%{::trusted.extensions.project}/%{::trusted.extensions.customerenv}/nodes/%{::trusted.certname}.yaml" # Node

  - name: "Common"

    paths:

      - "common.yaml" # Global defaults

common.yaml:

---

classes:

  - base

  - ntp

  - firewall

node.yaml:

classes:

  - REMOVE_firewall

  - fancy_custom_firewall

What we like to have:

lookup( { 'name'  => 'classes',

               'merge' => {

                 'strategy'        => 'unique',

                 'knockout_prefix' => 'REMOVE_',

         ).include

What we currently have to to:

# Hiera 5 lookup. Used to be hiera_include('classes')

$classes_tmp = lookup('classes', { merge => 'unique' })

# This is an ugly hack implementing knockout prefix for arrays.

# See https://tickets.puppetlabs.com/browse/HI-223 and https://tickets.puppetlabs.com/browse/HI-568 for more informations

$remove_classes_tmp = $classes_tmp.filter |$c| { $c =~ /^REMOVE_/ }

$remove_classes = $remove_classes_tmp.map |$c| { regsubst($c, '^REMOVE_', '') }

$classes = (($classes_tmp - $remove_classes) - $remove_classes_tmp)

$classes.include

Hope that helps. If I can provide more information, just let me know.

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Jira (PUP-7428) Implement knockout prefix for unique lookups

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