Ah, I misunderstood and didn't realize that Puppet's 'undef' bareword is 
effectively equivalent to a Ruby 'nil'.  Thanks for the follow-up!  I'm not 
all the way there yet, but yes, I believe this approach is working.  Thanks.

Just to be clear, I added a parameter definition to the module so that it 
now reads...

define drush::exec(
  $command        = $title,
  $creates           = undef,
) 


-Mark

On Thursday, May 29, 2014 10:21:41 AM UTC-5, Jose Luis Ledesma wrote:
>
> Have you tried to set it to undef?
> El 29/05/2014 17:13, "Mark McFate" <[email protected] <javascript:>> 
> escribió:
>
>> And thank you Joes Luis, but I'm also unable to make this work.  It seems 
>> the $creates parameter must be declared in my module and when left with a 
>> blank or nil value Puppet kicks back this error:
>>
>> Error: Parameter creates failed on Exec[drush-drush-download-modules]: 
>> creates must be a fully qualified path at 
>> /tmp/vagrant-puppet-1/modules-0/drush/manifests/exec.pp:68
>>   
>> -Mark
>>
>> On Thursday, May 29, 2014 9:47:55 AM UTC-5, Jose Luis Ledesma wrote:
>>>
>>> I have not tried with the creates param, but if its undef ( I.e. no one 
>>> have set it) you can use it directly
>>>
>>> exec { "drush-${title}" :
>>>
>>>       command => "drush ${command} ${root_option} ${uri_option} 
>>> ${force_option} ${additional_options}",
>>>
>>>       path    => [ '/bin', '/usr/bin' ],
>>>
>>>       creates => $creates, 
>>>
>>>     }
>>>
>>> If it's undef, this should work like not specifying it.
>>>
>>> Regards,
>>> El 29/05/2014 16:34, "Mark McFate" <[email protected]> escribió:
>>>
>>>> I'm probably going about this all wrong, but I have an instance where 
>>>> I've employed a Puppet module and need to *sometimes* add a "creates" 
>>>> attribute to one of the exec's defined there.  My code (below) is probably 
>>>> all wrong, but I think you'll see what I am trying to do...
>>>>
>>>>   if $creates != nil {
>>>>     exec { "drush-${title}" :
>>>>       command => "drush ${command} ${root_option} ${uri_option} 
>>>> ${force_option} ${additional_options}",
>>>>       path    => [ '/bin', '/usr/bin' ],
>>>>       creates => $creates, 
>>>>     }
>>>>   } else {
>>>>     exec { "drush-${title}" :
>>>>       command => "drush ${command} ${root_option} ${uri_option} 
>>>> ${force_option} ${additional_options}",
>>>>       path    => [ '/bin', '/usr/bin' ],
>>>>     }
>>>>   }
>>>>
>>>>  
>>>> This doesn't work and neither does specifying an empty or nil 
>>>> attribute, like "creates => ''" or "creates => nil".  
>>>>
>>>> If nothing else, I will create two different exec's, one with and the 
>>>> other without a creates attribute.  Can anyone suggest a more elegant 
>>>> solution?
>>>>
>>>> Thanks in advance.
>>>>  
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>

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