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!

[Ben Ford]

What you're looking for is the dig() function. https://puppet.com/docs/puppet/latest/function.html#dig

$profiles.dig('vpn', 'openvpn', 'instances', 'client')

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[Helmut Schneider]

Great, thanks a lot!