[Puppet Users] Check existence of a hierarchy

[Helmut Schneider]

Hello all,

let's assume the following structure in a yaml:

profiles:
  vpn:
    openvpn:
      instances:
        client:
          myclient:
            remote:           'openvpn_host 1194'

I would now like to check if e.g. "client" exists:

if ($profiles['vpn']['openvpn']['instances']['client'])

This works as long as the structure

profiles:
  vpn:
    openvpn:
      instances:

exists and fails if not (because OpenVPN should not be available for
that client):

Error: Could not retrieve catalog from remote server: Error 500 on
SERVER: Server Error: Evaluation Error: Operator '[]' is not applicable
to an Undef Value. at
/etc/puppetlabs/code/modules/openvpn/manifests/init.pp:17:7 on node
my_client

Is there a way to check the existence of a hierarchy without creating
an empty hierarchy or doing something like

  if is_hash($profiles) {
    if has_key($profiles, 'vpn') {
      if has_key($profiles['vpn'], 'openvpn') {
        if has_key($profiles['vpn']['openvpn'], 'instances') {
          ...and so on
        }
      }
    }
  }

Thank you!

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