Puppet users - May 2014 - Dynamically assign files to hiera hierarchy

Hi,

I'd like to add things dynamically to :hierarchy: when I use hiera.

I'd like to be able to do the following :

in site.pp:
hiera_roles()

hiera_roles() would search in hiera for something like :

mynode.yaml:
roles:
 - roles/appserver
 - roles/databaseserver

and I could have :

roles/appserver.yaml:
classes:
 - appserver


roles/databaseserver.yaml:
classes:
 - databaseserver

So my node is not limited to one role, but to any number of roles I decide. 
You know, sometime you have nodes acting as appservers or databaseservers 
and sometimes they do both.

Interpolation tokens in hiera.yaml could have been nice but arrays are not 
properly expanded in context of hiera. 
I've been looking at the code and this should be pretty straightforward to 
do so but I really don't get how to write Ruby code. This looks over 
complicated regarding other language I know such as Python/Java.

I just want a custom function hiera_roles() append to the hierarchy array 
used by Puppet.

Could someone help with writing this custom function ?

Regards,

Vincent


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