hiera merge lookup/alias of array defined at multiple levels

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Mark Dixon

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Sep 2, 2021, 1:30:37 PMSep 2
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Hi there,

I'd like to do a simple merge lookup of an array within a hiera yaml file. At the moment I seem to be getting the array from the hiera location that "wins", and not a merged version.

I guess it's not possible, perhaps due to possible circular dependencies, etc. Is that right, please?

Thanks,

Mark

e.g.

one_file_in_hiera_path.yaml:
"""
an_array:
- one
"""

another_file_in_hiera_path.yaml:
"""
an_array:
- two
"""

yet_another_file_in_hiera_path.yaml:
"""
merged_array_attempt1: "%{alias('an_array')}"

merged_array_attempt2: "%{lookup('an_array')}"
"""

Neither merged_array_attempt1 or merged_array_attempt2 returns the merged array, just the definition in one of the files.

Dirk Heinrichs

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Sep 3, 2021, 1:28:03 AMSep 3
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Am Donnerstag, dem 02.09.2021 um 08:46 -0700 schrieb Mark Dixon:

I'd like to do a simple merge lookup of an array within a hiera yaml file. At the moment I seem to be getting the array from the hiera location that "wins", and not a merged version.

You need to tell hiera to do so, probably in your common.yaml, by specifying "lookup_options":

---
lookup_options:
  an_array:
    merge: unique

or by specifying the merge behaviour when calling "lookup()", see https://puppet.com/docs/puppet/6/hiera_automatic.html#lookup-merge-behaviors

HTH...

Dirk
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Dirk Heinrichs
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Mark Dixon

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Sep 3, 2021, 8:43:49 AMSep 3
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Hi Dirk,

Thanks so much for that, adding lookup_options in common.yaml worked :)

Ideally I'd like to put the setting as an argument to %{lookup()} or %{alias()} within hiera documents, but they don't seem to support that.

All the best,

Mark
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