Issue #5517 has been updated by eric sorenson.

Assignee changed from Nick Lewis to eric sorenson
Target version changed from 2.7.x to 3.x

Hi all, we are trying to work through the implications of this problem.  It's 
clearly something people feel strongly about and goes deep into the guts of 
puppet. I got a bit of a braindump from nick lewis; as I understand it, the nut 
of it is that although resource-style class declaration makes classes look like 
resources, they are not _actually_ resources so the parameter override syntax 
you're trying to do via inheritance doesn't work. 
----------------------------------------
Bug #5517: behavior change within 2.6 makes it impossible to override class 
parameters of "included" parametrized classes
https://projects.puppetlabs.com/issues/5517#change-69780

Author: Peter Meier
Status: Accepted
Priority: High
Assignee: eric sorenson
Category: language
Target version: 3.x
Affected Puppet version: 2.6.3
Keywords: parameterized_classes
Branch: 


In 2.6.1 the following recipe:

<pre>
class a(
  $b_c = { 'b' => 'foo' }
) {
  notice $a::b_c
  if $a::b_c {
    notice $a::b_c['b']
  }
}

class b {
  class{'a': b_c => false }
}

class b::c inherits b {
  Class['a']{ b_c => { 'b' => 'bleh' } }
}

class b::d {
  include ::b::c
}

include b::d
</pre>

produces the following output:

<pre>
$ puppet foo.pp 
notice: Scope(Class[A]): bbleh
notice: Scope(Class[A]): bleh
</pre>

Which is what I expected. However with 2.6.3 it produces the following output:

<pre>
# puppet foo.pp 
notice: Scope(Class[A]): false
</pre>

Imho likely the changes for #4778 and #5074 are responsible for that behavior 
change.

However this makes it impossible to overwrite parameters of a "included" 
parametrized class in a subclass. There are only ugly workarounds for that 
problem and I think this should actually work as it did within 2.6.1. Otherwise 
the usefulness of parametrized classes is quite reduced.


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