look up hiera hash's subkey within yaml

[Brett Swift]

This is a bit nutty, but hopefully there's a way to do this.

So far I have only been able to get the parent hash, not the nested one.   

The reason I don't want to do this in a manifest,  is because I'd like to use pieces of this hash within hiera itself.

This gist is what I'm trying to do: 

https://gist.github.com/brettswift/560af53d379e0d86730c

pasted here: 

	group_allocation:
	devcoreoeml030.matrix.sjrb.ad: smokestack
	devcorebrml030.matrix.sjrb.ad: smokestack
	devcoreesbl030.matrix.sjrb.ad: smokestack
	devcoreoeml091.matrix.sjrb.ad: the091
	devcorebrml091.matrix.sjrb.ad: the091
	devcoreesbl091.matrix.sjrb.ad: the091
	devcorepptl003.matrix.sjrb.ad: dev_master
	tstcorepptl003.matrix.sjrb.ad: tst_master
	devcorepptl918.matrix.sjrb.ad: brett_sandbox
	devcorepptl919.matrix.sjrb.ad: brett_sandbox
	groups:
	core030:
	data:
	tag: smokestack
	owner: bcornies
	the091:
	data:
	tag: brettstack
	owner: bswift
	brett_sandbox:
	data:
	tag: brett
	owner: bswift
	my_group_name: "%{hiera('group_allocation')}.%{::fqdn}"
	my_group: "%{hiera('groups[%{hiera('my_group_name')}]')}"
	#my_tag: ...

My goal is to find access to the tag, owner, etc.   This is a bit nutty as it's kind of relational data in hieradata, but we're hoping we can do this.

Right now the two lookups at the bottom do not work.   I can get the top level lookup, but beyond that - it's not working.  Has someone done this? I can only seem to find examples to compare with this being done in a manifest file, not in a yaml file. 

[Carthik Sharma]

This might help:

https://docs.puppetlabs.com/hiera/3.1/variables.html#interpolating-hash-or-array-elements

Thanks.

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[Brett Swift]

Well that's what I've been going off, but I haven't figured out the right syntax. 

I've tried escaping the nested single quotes.. no luck. 

One strange thing right now is I can't even interpolate facts.

---
test: "%{::hostname}"

 is failing on a lookup.  hmm. 

[Brett Swift]

fact parsing was a problem with a template not the hiera code. 

The only way I get this working is if I do a lookup in a profile manifest of the main hash,  then reference that variable back in hiera. 

This seems wrong, and coupled,  and flakey,  which is why it's listed as a bad practice on the puppetlabs documentation. 

However,  apparently we did this another time trying to solve the same problem. 

In software, seeming to be forced into an anti-pattern twice would indicate there is a better design.   If anyone has any thoughts here - we want to hear it!   Either that or we need a different hiera function for this.