merging hashes with puppet lookup function

[Chris Southall]

I'm trying to merge hiera hashes using the lookup function as described here:

https://puppet.com/docs/puppet/5.5/hiera_automatic.html#puppet-lookup

Here's my test:

Hiera config file:

==========================

---

version: 5

defaults:

  datadir: hiera

  data_hash: yaml_data

hierarchy:

  - name: "Test 1"

    path: "test1.yaml"

  - name: "Test 2"

    path: "test2.yaml"

==========================

File: "test1.yaml" 

==========================

---

simple::package:

  package1:

    ensure: 'installed'

==========================

File: "test2.yaml"

==========================

---

simple::package:

  package2:

    ensure: 'installed'

==========================

Lookup works as expected - the first match is found.

puppet lookup --hiera_config ./hiera.yaml simple::package

==========================

---

package1:

  ensure: installed

==========================

When merge strategy set to hash, the lookup returns results from both hiera files.

lookup --hiera_config ./hiera.yaml --merge hash simple::package 

==========================

---

package2:

  ensure: installed

package1:

  ensure: installed

==========================

Everything makes sense to this point.  Now to apply this in a manifest.

Here's my test class, specifying 'hash' merge strategy to lookup()

==========================

class simple (

  Hash $package = lookup('simple::package', Hash, 'hash', {}),

) {

  create_resources('Package',$package)

}

==========================

Apply (noop) the module, but only 'package1' gets defined as a package resource.  Shouldn't the lookup

have merged the hashes?  ('package2' is definately not already installed)

==========================

sudo puppet apply --modulepath=${modpath} --hiera_config=${hieraconf} --execute "include simple" --test --noop

Info: Loading facts

Info: Loading facts

Notice: Compiled catalog for mynode in environment production in 0.02 seconds

Info: Applying configuration version '1560036315'

Notice: /Stage[main]/Simple/Package[package1]/ensure: current_value 'purged', should be 'present' (noop)

Notice: Class[Simple]: Would have triggered 'refresh' from 1 event

Notice: Stage[main]: Would have triggered 'refresh' from 1 event

Notice: Applied catalog in 0.22 seconds

==========================

I've tried setting the merge strategy in the class lookup function using string or hash syntax, with both

'hash' and 'deep' as the strategy, but can't get the class to merge the hashes.  Am I missing something

with the lookup function?

$ puppet -V

5.5.14

# hiera -V

3.4.6

[Henrik Lindberg]

By default automatic loopkup uses priority. To change that you should
use "lookup_option" that is set in your data. This is documented here:
https://puppet.com/docs/puppet/6.4/hiera_merging.html#concept-2997

Hope that helps.
- henrik


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