On Thursday, March 14, 2013 2:28:13 AM UTC-5, dirk.he...@altum.de wrote:
>
> Am Mittwoch, 13. März 2013 17:00:18 UTC+1 schrieb jcbollinger:
>
>>
>>
>> My problem now is that I don't know how to implement "ensure" for this
>>> case, as I cannot use "ensurable" in the type.
>>>
>>
>> Your problem is that you are conflating distinct (for your purposes)
>> aspects of your resource's state. If you care at times whether the
>> variable is declared at all or not, and at other times what its value is,
>> then those should be separate properties. Your resource declarations will
>> then look like this:
>>
>> env_var { 'AWESOMENESS':
>> value => 'meh',
>> # optional:
>> ensure => present
>> }
>>
>> or
>>
>> env_var { 'AWESOMENESS':
>> ensure => absent
>> }
>>
>
> I've changed the logic of exists? a bit to reflect this, and it works.
> However, one has to remember not to provide a value if "ensure => absent"
> was specified.
>
That's under your control. Were I you, I would probably implement flushing
for this resource type instead of applying changes directly in response to
property changes. See
http://docs.puppetlabs.com/guides/provider_development.html#flushing. That
way your provider can act based on all of its properties together, instead
of acting separately on each one.
Alternatively, your provider's value=() method could condition its behavior
on its resource's should(:ensure) value (and perhaps vise versa, too), so
that it does not perform needless operations.
> Or is there a way to check this in the provider?
>
There are validation and munging hooks for resource parameters, but they
only work on a parameter-by-parameter basis. As far as I know, there is no
whole-resource validation hook built into the framework.
John
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