On 24/08/17 04:27, John Baird wrote:
Henrik,
Thanks for the feedback, while I wish there was a "better/native" way, I
have accepted that I need to write my own function. I would like to be
able to use a similar syntax as "lookup()" and simply specify a filepath
and have the contents returned as the content of the file being created.
I am fairly certain I can accomplish this, but I am not sure how I
gain access to the hiera scope or hierarchy that is defined by either
the module or the global/environment scope. I want my custom module to
be able to search the hiera path(s) for the necessary file structure.
How would I go about getting that scope into a custom function? Thanks!
Unless you are using the bad practice of using 'calling_module' or even
worse: variables in the calling scope (if you managed to get that
working) - you do not need to relay the *calling* scope. If all you are
accessing in your hiera.yaml is top scope variables, then you can just
use 'call_function' (or in puppet language, just call it with normal
puppet syntax).
If you however must delegate *calling* scope, then this is an example of
a Ruby function that does that:
https://github.com/puppetlabs/puppet/blob/ebd96213cab43bb2a8071b7ac0206c3ed0be8e58/lib/puppet/functions/include.rb
You cannot do the same with a function written in the puppet language.
(FWIW: In general it is a really bad idea to design functions that do
different things depending on from where they are called).
When you write such a delegating function, you can call another function
and pass in the scope to use by using 'internal_call_function' instead
of 'call_function' - the signature is the same but it takes a scope as
its first argument.
Best,
- henrik
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