Run a custom function through the ruby debugger

[Andrea Ieri]

Hallo,

I'm developing a custom function that is exhibiting some odd behavior, so I would like to debug it.

How do I load it in the ruby shell in a way that lets me execute it?

I have tried the steps on the documentation:

irb(main):001:0> require 'puppet'

=> true

irb(main):002:0> require 'phash2text.rb' 

=> true

irb(main):003:0> Puppet::Parser::Functions.function(:hash2text)

=> "function_hash2text"

irb(main):004:0> function_hash2text

NameError: undefined local variable or method `function_hash2text' for main:Object

from (irb):4

from :0

But how can I actually execute the function?

Thanks,

Andrea 

[Henrik Lindberg]

Here is how to invoke the function 'fqdn_rand(30)' in irb

irb > require 'puppet'
irb > scope => Puppet::Parser::Scope.new_for_test_harness('localhost')
irb>> scope.function_fqnrand([30])

=> "1"

That may not work if your function requires a fully configured system.
If you need that set the breakpoint inside your function, and then
invoke with
puppet apply - i.e. puppet apply -e 'notice fqdn_rand(30)'

A good approach is to start with an rspec test for your function, then
you can invoke that when you want to debug. Look at
spec/unit/parser/functions/fqdn_rand_spec.rb for an example how to test
a function.

Hope that helps
- henrik

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