hiera with external facts

common.yaml

---
message: "This is our common yaml file"
classes:
 - site
 - 'profile::base'

hiera.yaml

---
:backends:
  - yaml
:hierarchy:
  - "nodes/%{::fqdn}"
  - "cluster/%{::node_info.cluster}"
  - "groups/%{::node_info.group}"
  - "roles/%{::node_info.role}"
  - common

:yaml:
# datadir is empty here, so hiera uses its defaults:
# - /etc/puppetlabs/code/environments/%{environment}/hieradata on *nix
# - %CommonAppData%\PuppetLabs\code\environments\%{environment}\hieradata on Windows
# When specifying a datadir, make sure the directory exists.
  :datadir: /etc/puppetlabs/code/environments/%{environment}/hieradata

init.pp

class site (
  $node_info = undef,) {
  notify {"${::node_info['cluster']}": }
  if $node_info {
    file { [
      '/etc/puppetlabs/facter/',
      '/etc/puppetlabs/facter/facts.d']: ensure => directory, }

    file { '/etc/puppetlabs/facter/facts.d/node_info.yaml':
      content => template("${module_name}/node_info.erb"),
      owner   => root,
      group   => root,
      mode    => '0644',
    }
  }
  notify { hiera('message', 'none'): }
}

puppetserver.yaml

---
site::node_info:
  cluster: dice
  group: service
  role: puppetserver
  

service.yaml

---
site::node_info:
  cluster: dice
  group: service
  role: puppetserver