Issue #6539 has been updated by Nick Lewis.

Assignee set to Nick Lewis
Branch set to https://github.com/nicklewis/puppet/tree/ticket/master/6539

I have a prototype partial fix to this. It doesn't have tests, doesn't yet 
support inheriting defaults in either direction (though it's not clear whether 
a default for an argument in a child should be used as the value for that 
argument in the parent if the parent does not supply a default), and I likely 
has some glaring edge cases I haven't considered (like defined types, or 
resource types other than classes).

In any case, if someone else wants to test whether it works, or find any 
problems with it, it's available for testing now.
----------------------------------------
Bug #6539: Inheritance of a parametrized class does not work
https://projects.puppetlabs.com/issues/6539

Author: Peter Meier
Status: Accepted
Priority: High
Assignee: Nick Lewis
Category: parameterized classes
Target version: 
Affected Puppet version: 2.6.5
Keywords: 
Branch: https://github.com/nicklewis/puppet/tree/ticket/master/6539


Given the following manifest:

<pre>

# cat foo.pp 
class a($m){
  include c
}

class b inherits a {
  include d
  notice $m
}

class c {
  file{'/tmp/a': content => $a::m }
}

class d inherits c {
  File['/tmp/a']{ mode => 0600 }
}

class{'b': m => 'foo' }
</pre>

produces the following error:
<pre>
# puppet --trace foo.pp
/usr/lib/ruby/site_ruby/1.8/puppet/util/errors.rb:60:in `fail'
/usr/lib/ruby/site_ruby/1.8/puppet/parser/resource.rb:313:in `validate'
/usr/lib/ruby/site_ruby/1.8/puppet/parser/resource.rb:98:in `finish'
/usr/lib/ruby/site_ruby/1.8/puppet/parser/resource.rb:70:in `evaluate'
/usr/lib/ruby/site_ruby/1.8/puppet/parser/compiler.rb:151:in `evaluate_classes'
/usr/lib/ruby/site_ruby/1.8/puppet/parser/compiler.rb:142:in `each'
/usr/lib/ruby/site_ruby/1.8/puppet/parser/compiler.rb:142:in `evaluate_classes'
/usr/lib/ruby/site_ruby/1.8/puppet/parser/ast/resource.rb:56:in `evaluate'
/usr/lib/ruby/site_ruby/1.8/puppet/util/errors.rb:35:in `exceptwrap'
/usr/lib/ruby/site_ruby/1.8/puppet/parser/ast/resource.rb:39:in `evaluate'
/usr/lib/ruby/site_ruby/1.8/puppet/parser/ast/resource.rb:38:in `collect'
/usr/lib/ruby/site_ruby/1.8/puppet/parser/ast/resource.rb:38:in `evaluate'
/usr/lib/ruby/site_ruby/1.8/puppet/parser/ast.rb:72:in `safeevaluate'
/usr/lib/ruby/site_ruby/1.8/puppet/parser/ast/astarray.rb:35:in `evaluate'
/usr/lib/ruby/site_ruby/1.8/puppet/parser/ast/astarray.rb:34:in `collect'
/usr/lib/ruby/site_ruby/1.8/puppet/parser/ast/astarray.rb:34:in `evaluate'
/usr/lib/ruby/site_ruby/1.8/puppet/parser/ast.rb:72:in `safeevaluate'
/usr/lib/ruby/site_ruby/1.8/puppet/resource/type.rb:76:in `evaluate_code'
/usr/lib/ruby/site_ruby/1.8/puppet/parser/resource.rb:71:in `evaluate'
/usr/lib/ruby/site_ruby/1.8/puppet/parser/compiler.rb:290:in `evaluate_main'
/usr/lib/ruby/site_ruby/1.8/puppet/parser/compiler.rb:101:in `compile'
/usr/lib/ruby/site_ruby/1.8/puppet/parser/compiler.rb:18:in `compile'
/usr/lib/ruby/site_ruby/1.8/puppet/indirector/catalog/compiler.rb:77:in 
`compile'
/usr/lib/ruby/site_ruby/1.8/puppet/util.rb:197:in `benchmark'
/usr/lib/ruby/site_ruby/1.8/puppet/indirector/catalog/compiler.rb:75:in 
`compile'
/usr/lib/ruby/site_ruby/1.8/puppet/indirector/catalog/compiler.rb:34:in `find'
/usr/lib/ruby/site_ruby/1.8/puppet/indirector/indirection.rb:193:in `find'
/usr/lib/ruby/site_ruby/1.8/puppet/indirector.rb:50:in `find'
/usr/lib/ruby/site_ruby/1.8/puppet/application/apply.rb:115:in `main'
/usr/lib/ruby/site_ruby/1.8/puppet/application/apply.rb:35:in `run_command'
/usr/lib/ruby/site_ruby/1.8/puppet/application.rb:287:in `run'
/usr/lib/ruby/site_ruby/1.8/puppet/application.rb:393:in `exit_on_fail'
/usr/lib/ruby/site_ruby/1.8/puppet/application.rb:287:in `run'
/usr/lib/ruby/site_ruby/1.8/puppet/util/command_line.rb:55:in `execute'
/usr/bin/puppet:4
/usr/lib/ruby/site_ruby/1.8/puppet/parser/compiler.rb:21:in `compile'
/usr/lib/ruby/site_ruby/1.8/puppet/indirector/catalog/compiler.rb:77:in 
`compile'
/usr/lib/ruby/site_ruby/1.8/puppet/util.rb:197:in `benchmark'
/usr/lib/ruby/site_ruby/1.8/puppet/indirector/catalog/compiler.rb:75:in 
`compile'
/usr/lib/ruby/site_ruby/1.8/puppet/indirector/catalog/compiler.rb:34:in `find'
/usr/lib/ruby/site_ruby/1.8/puppet/indirector/indirection.rb:193:in `find'
/usr/lib/ruby/site_ruby/1.8/puppet/indirector.rb:50:in `find'
/usr/lib/ruby/site_ruby/1.8/puppet/application/apply.rb:115:in `main'
/usr/lib/ruby/site_ruby/1.8/puppet/application/apply.rb:35:in `run_command'
/usr/lib/ruby/site_ruby/1.8/puppet/application.rb:287:in `run'
/usr/lib/ruby/site_ruby/1.8/puppet/application.rb:393:in `exit_on_fail'
/usr/lib/ruby/site_ruby/1.8/puppet/application.rb:287:in `run'
/usr/lib/ruby/site_ruby/1.8/puppet/util/command_line.rb:55:in `execute'
/usr/bin/puppet:4
Invalid parameter m at /tmp/foo.pp:18 on node foo
</pre>

Changing the manifest to:
<pre>
# cat foo.pp
class a($m){
  include c
}

class b($m) inherits a {
  include d
  notice $m
}

class c {
  file{'/tmp/a': content => $a::m }
}

class d inherits c {
  File['/tmp/a']{ mode => 0600 }
}

class{'b': m => 'foo' }
</pre>

Produces the following error.

<pre>
# puppet --trace foo.pp
/usr/lib/ruby/site_ruby/1.8/puppet/util/errors.rb:60:in `fail'
/usr/lib/ruby/site_ruby/1.8/puppet/resource/type.rb:232:in 
`set_resource_parameters'
/usr/lib/ruby/site_ruby/1.8/puppet/resource/type.rb:227:in `each'
/usr/lib/ruby/site_ruby/1.8/puppet/resource/type.rb:227:in 
`set_resource_parameters'
/usr/lib/ruby/site_ruby/1.8/puppet/resource/type.rb:74:in `evaluate_code'
/usr/lib/ruby/site_ruby/1.8/puppet/parser/resource.rb:71:in `evaluate'
/usr/lib/ruby/site_ruby/1.8/puppet/resource/type.rb:295:in 
`evaluate_parent_type'
/usr/lib/ruby/site_ruby/1.8/puppet/resource/type.rb:67:in `evaluate_code'
/usr/lib/ruby/site_ruby/1.8/puppet/parser/resource.rb:71:in `evaluate'
/usr/lib/ruby/site_ruby/1.8/puppet/parser/compiler.rb:151:in `evaluate_classes'
/usr/lib/ruby/site_ruby/1.8/puppet/parser/compiler.rb:142:in `each'
/usr/lib/ruby/site_ruby/1.8/puppet/parser/compiler.rb:142:in `evaluate_classes'
/usr/lib/ruby/site_ruby/1.8/puppet/parser/ast/resource.rb:56:in `evaluate'
/usr/lib/ruby/site_ruby/1.8/puppet/util/errors.rb:35:in `exceptwrap'
/usr/lib/ruby/site_ruby/1.8/puppet/parser/ast/resource.rb:39:in `evaluate'
/usr/lib/ruby/site_ruby/1.8/puppet/parser/ast/resource.rb:38:in `collect'
/usr/lib/ruby/site_ruby/1.8/puppet/parser/ast/resource.rb:38:in `evaluate'
/usr/lib/ruby/site_ruby/1.8/puppet/parser/ast.rb:72:in `safeevaluate'
/usr/lib/ruby/site_ruby/1.8/puppet/parser/ast/astarray.rb:35:in `evaluate'
/usr/lib/ruby/site_ruby/1.8/puppet/parser/ast/astarray.rb:34:in `collect'
/usr/lib/ruby/site_ruby/1.8/puppet/parser/ast/astarray.rb:34:in `evaluate'
/usr/lib/ruby/site_ruby/1.8/puppet/parser/ast.rb:72:in `safeevaluate'
/usr/lib/ruby/site_ruby/1.8/puppet/resource/type.rb:76:in `evaluate_code'
/usr/lib/ruby/site_ruby/1.8/puppet/parser/resource.rb:71:in `evaluate'
/usr/lib/ruby/site_ruby/1.8/puppet/parser/compiler.rb:290:in `evaluate_main'
/usr/lib/ruby/site_ruby/1.8/puppet/parser/compiler.rb:101:in `compile'
/usr/lib/ruby/site_ruby/1.8/puppet/parser/compiler.rb:18:in `compile'
/usr/lib/ruby/site_ruby/1.8/puppet/indirector/catalog/compiler.rb:77:in 
`compile'
/usr/lib/ruby/site_ruby/1.8/puppet/util.rb:197:in `benchmark'
/usr/lib/ruby/site_ruby/1.8/puppet/indirector/catalog/compiler.rb:75:in 
`compile'
/usr/lib/ruby/site_ruby/1.8/puppet/indirector/catalog/compiler.rb:34:in `find'
/usr/lib/ruby/site_ruby/1.8/puppet/indirector/indirection.rb:193:in `find'
/usr/lib/ruby/site_ruby/1.8/puppet/indirector.rb:50:in `find'
/usr/lib/ruby/site_ruby/1.8/puppet/application/apply.rb:115:in `main'
/usr/lib/ruby/site_ruby/1.8/puppet/application/apply.rb:35:in `run_command'
/usr/lib/ruby/site_ruby/1.8/puppet/application.rb:287:in `run'
/usr/lib/ruby/site_ruby/1.8/puppet/application.rb:393:in `exit_on_fail'
/usr/lib/ruby/site_ruby/1.8/puppet/application.rb:287:in `run'
/usr/lib/ruby/site_ruby/1.8/puppet/util/command_line.rb:55:in `execute'
/usr/bin/puppet:4
/usr/lib/ruby/site_ruby/1.8/puppet/parser/compiler.rb:21:in `compile'
/usr/lib/ruby/site_ruby/1.8/puppet/indirector/catalog/compiler.rb:77:in 
`compile'
/usr/lib/ruby/site_ruby/1.8/puppet/util.rb:197:in `benchmark'
/usr/lib/ruby/site_ruby/1.8/puppet/indirector/catalog/compiler.rb:75:in 
`compile'
/usr/lib/ruby/site_ruby/1.8/puppet/indirector/catalog/compiler.rb:34:in `find'
/usr/lib/ruby/site_ruby/1.8/puppet/indirector/indirection.rb:193:in `find'
/usr/lib/ruby/site_ruby/1.8/puppet/indirector.rb:50:in `find'
/usr/lib/ruby/site_ruby/1.8/puppet/application/apply.rb:115:in `main'
/usr/lib/ruby/site_ruby/1.8/puppet/application/apply.rb:35:in `run_command'
/usr/lib/ruby/site_ruby/1.8/puppet/application.rb:287:in `run'
/usr/lib/ruby/site_ruby/1.8/puppet/application.rb:393:in `exit_on_fail'
/usr/lib/ruby/site_ruby/1.8/puppet/application.rb:287:in `run'
/usr/lib/ruby/site_ruby/1.8/puppet/util/command_line.rb:55:in `execute'
/usr/bin/puppet:4
Must pass m to Class[A] at /tmp/foo.pp:1 on node foo
</pre>

It seems like there is currently no way to inherit from a parametrized class.

Probably related to #4534


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