What you're looking for is the dig() function.
https://puppet.com/docs/puppet/latest/function.html#dig
$profiles.dig('vpn', 'openvpn', 'instances', 'client')
On Wed, Jul 11, 2018 at 8:32 AM Helmut Schneider <jumpe...@gmx.de> wrote:
> Hello all,
>
> let's assume the following structure in a yaml:
>
> profiles:
> vpn:
> openvpn:
> instances:
> client:
> myclient:
> remote: 'openvpn_host 1194'
>
> I would now like to check if e.g. "client" exists:
>
> if ($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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