[Puppet Users] best practice for accessing facts from ERB template?

['Tim Mooney' via Puppet Users]

All-

Is there a canonical way to access hierarchical facts like
$facts['os']['release']['major'] or $facts['networking']['fqdn'] from
an ERB template?  I've been searching for a best practice answer and
so far I've only found conflicting advice.

I'm specifically asking about facts, not variables from other
classes/scope.

I've found recommendations suggesting each of these:

        <%= $facts['os']['release']['major'] %>
        <%= @facts['os']['release']['major'] %>
        <%= $facts.dig("os","release","major") %>
        <%= @facts.dig("os","release","major") %>

as well as suggestions to use scope[] or scope.lookupvar() or use dotted
fact notation, but I haven't figured out how to make either the scope or
dotted route work in ERB.

The "$facts.dig()" suggestion comes directly from the Puppet 8
compatibility wiki entry:

        https://github.com/puppetlabs/puppet/wiki/Puppet-8-Compatibility

but it doesn't seem to work for me.  Using the @facts.dig() does, though.

So far the two methods I've found that work are

        <%= @facts['os']['release']['major'] %>

or

        <%= @facts.dig("os","release","major") %>

Is there any reason to prefer one over the other, or some other method
that I haven't found yet?

I don't want to convert our existing ERB templates to EPP.

I know I could set local variables in a puppet class like

        $osreleasemajor = $facts['os']['release']['major']
        $fqdn           = $facts['networking']['fqdn']

and then access the local variables in the template, but if possible I
would like to avoid that approach.

Thanks,

Tim
--
Tim Mooney                                             tim.moo...@ndsu.edu
Enterprise Computing & Infrastructure /
Division of Information Technology    /                701-231-1076 (Voice)
North Dakota State University, Fargo, ND 58105-5164

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