Issue #5046 has been updated by Nigel Kersten.

Target version changed from Statler to Telly


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Bug #5046: Mixed invocation of parameterized classes leads to order 
dependencies, should be disallowed
https://projects.puppetlabs.com/issues/5046

Author: Paul Berry
Status: Needs Decision
Priority: Normal
Assignee: Nigel Kersten
Category: language
Target version: Telly
Affected Puppet version: 
Keywords: parameterized_classes
Branch: 


When a parameterized class has default values for all of its parameters, it may 
be invoked using either "include" or "class { ... }" notation.  The "include" 
notation is idempotent; the "class { ... }" notation isn't.  As a result, there 
is an order dependency.  This works:

<pre>
class foo($param = defaultvalue) {
  notify { $param: }
}

class { foo: param => value }
include foo
</pre>

But this produces an error:

<pre>
class foo($param = defaultvalue) {
  notify { $param: }
}

include foo
class { foo: param => value }
</pre>

In large manifests, it is not always obvious (or even well-defined) what order 
statements will be executed in.  To avoid user confusion, I think it would be 
preferable if both these examples produced an error message saying something 
like "class foo already invoked using 'class { ... }' syntax, cannot also 
invoke using 'include'".


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