custom puppet parser functions does not get re-executed on subsequent puppet agent runs.

asked 2018-06-15 08:06:17 -0500


I want to write a custom function using legacy parser function API of puppet. Because I want to support it on puppet 3. Here is my function: endmodule Puppet::Parser::Functions newfunction(:testt, :arity =>1, :type => :rvalue, :doc => "Convert input array of hashes (optionally JSON encoded) to a puppet Array of JSON encoded Strings") do |arg| tvault_ip = arg[0] return "1234" end

When I run puppet agent -t on agent node, I get correct value i.e 1234. But If I change this value in function to something else like "456 " and run puppet agent -t again, it's still returning 1234 Strange. Looks like function is not getting re-executed on next runs. It is returning old value only.

Any idea?

Thanks Shyam

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Are you sure the updated function is being loaded?

supercow gravatar imagesupercow ( 2018-06-16 13:36:43 -0500 )edit

It is getting executed for first time correctly, I think it means function is getting loaded. Any special configuration we need to do to make it load on every run? gravatar ( 2018-06-18 00:59:40 -0500 )edit

When you run a custom function, it is cached until you restart the puppet service. After a service restart, you'll start seeing the right value... it makes iteration difficult, and I was previously struck by this same bug. (correct value with my_functio.rb, but my_function.rb shows the old value)

DarylW gravatar imageDarylW ( 2018-06-18 08:28:18 -0500 )edit

This is due to the way that puppet internally stores the functions for ruby to access them. You also can have a function 'bleed' over from a different environment under puppet 3, and it wasn't until later in puppt 4 that they added a way for them to be hashed differently based on environment

DarylW gravatar imageDarylW ( 2018-06-18 08:29:12 -0500 )edit

If you throw the 1234 value into hiera does it solve the issue ?

x099008 gravatar imagex099008 ( 2018-06-18 12:54:58 -0500 )edit