+1 Data in modules is absolutely necessary!

On Sat, May 31, 2014 at 10:18 AM, Daniele Sluijters <
daniele.sluijt...@gmail.com> wrote:

> > So, if you're willing to depend on other modules, then I think
> ripienaar/module-data <https://forge.puppetlabs.com/ripienaar/module_data> 
> combined
> with explicit lookups can do a lot of what you're after.
>
> Honestly, that should just be part of Puppet core. It's such an incredibly
> useful feature and would go a long way to help people out in such
> scenario's. It might not be the utopia Alessandro is shooting for but it's
> certainly a good compromise.
>
>
> On Tuesday, 27 May 2014 17:41:11 UTC+2, John Bollinger wrote:
>>
>>
>>
>> On Monday, May 26, 2014 11:01:59 AM UTC-5, Alessandro Franceschi wrote:
>>>
>>>
>>>
>>> On Tuesday, May 20, 2014 6:25:10 PM UTC+2, John Bollinger wrote:
>>>
>>
>> [Al:]
>>
>>
>>> If you have any suggestion on how to use directly Hiera that would be
>>> welcomed, as usual.
>>>
>>>
>>>>
>>>>
>>>> > Thanks anyway for the attempt, hopefully now is clearer why I can’t
>>>> do this with existing functionalities.
>>>>
>>>>
>>>> Your requirements are clearer, yes.  What's not quite clear yet is
>>>> whether you want to avoid your data binding falling back to general data
>>>> when resource parameters are not found in module-specific data.  If you do
>>>> want to avoid that then I think you're right that existing functionalities
>>>> won't do what you want, but then I'm certain that you were wrong earlier
>>>> about what you want being achievable by a simple modification.
>>>>
>>>
>>> Well, if data binding for defines is not a possibile approach, the
>>> module will have its internal default values for  parameters and accept (of
>>> course) users' overrides.
>>> I still have to figure out how to merge user provided data with internal
>>> default data ( I think it make sense to expose a parameter that let the
>>> user define the merge behaviour)
>>>
>>>
>>
>>
>> To what extent would you still have this problem if you could use hiera
>> directly?  I'm thinking that the issue there might be only that there are
>> parameters that you wish to actively prevent the user from overriding.  If
>> that's the only thing, then would you be willing to give up active
>> enforcement for documentation (i.e. telling users "don't do that")?
>>
>>
>>
>>>
>>>> On the other hand, I think you could put a custom function into module
>>>> 'tp' that would read data from (only) a module-specific data source, along
>>>> lines similar to hiera.  If you used such a function instead of hiera(),
>>>> then could a solution along the lines I described work for you?
>>>>
>>>
>>> Yep, the tp_lookup function mentioned earlier is expected to do what I'd
>>> have preferred to do via Hiera data bindings (on defined params) + module
>>> in data.
>>>
>>
>>
>> So, if you're willing to depend on other modules, then I think
>> ripienaar/module-data
>> <https://forge.puppetlabs.com/ripienaar/module_data> combined with
>> explicit lookups can do a lot of what you're after.  It gives you an
>> always-on (doesn't depend on the user modifying hiera.yaml), in-module data
>> source from which you can look up the needed data.  For defined types and
>> current Puppet, that necessarily involves explicit lookups, as we already
>> discussed.
>>
>> If that combination leaves essential features unserved, then perhaps at
>> least R.I.'s module can give you ideas for how to build your own -- maybe
>> just the same thing but defaulting to highest priority.
>>
>>
>> John
>>
>>  --
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-- 
Trevor Vaughan
Vice President, Onyx Point, Inc
(410) 541-6699
tvaug...@onyxpoint.com

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