CODEWITHSUNDEEP
puppethiera
pascalre
pascalre

Reputation: 335

How to access a value in an hiera hash directly with puppet lookup?

Let's say there is an hiera hash:

foo::bar:
  key1: 'value1'
  key2: 'value2'

Is there any possibility to lookup the value of key1 directly with the lookup function?

I thought of something like:

class myclass (
  String $value1 = lookup('foo::bar::key1'),
) {
...
}

The only way I could solve this, is to lookup the Hash and acces the value later with hash['key1'], but maybe there is a more clean way to do this.

Upvotes: 0

Views: 2936

Answers (2)

Steve Shipway
Steve Shipway

Reputation: 4027

This is now possible in puppet (v6 and later)! You use dot notation

lookup('foo::bar.key1')

See the puppet documentation here: https://puppet.com/docs/puppet/7/hiera_automatic.html#access_hash_array-elements_keysubkey_notation

Upvotes: 1

Jon
Jon

Reputation: 3671

Unfortunately, there isn't a way to do this in Puppet using just lookup.

Fundamentally, lookup works by looking up Hiera keys, which are unrelated to hash keys. A Hiera key of the form foo::bar::baz is effectively a single unstructured string - it doesn't imply that there are hashes called foo or foo::bar. The :: is just part of the key string - it isn't syntactic sugar for a hash lookup, as is, for example, . in JavaScript.

lookup is documented at

https://puppet.com/docs/puppet/latest/hiera_automatic.html

Upvotes: 2

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