On Sep 16, 2010, at 4:57 PM, Ian Ward Comfort wrote:
> On 16 Sep 2010, at 1:03 PM, Nigel Kersten wrote:
>> On Thu, Sep 16, 2010 at 12:49 PM, Jeff McCune <[email protected]> wrote:
>>> Also, please keep in mind this entire discussion applies to resource
>>> defaults as well. Whatever behavior we implement for variables should also
>>> be implemented for resource defaults.
>>
>> So the plan is that the only place you can reliably set global resource
>> defaults is directly in your site.pp or in an *import* from site.pp ?
>
> I actually prefer this, as a matter of policy. Though we don't use any
> third-party Puppet code here yet, I'm looking forward to a future date when
> mixing-and-matching Puppet modules from different sources is feasible and
> efficient. And in that world, I want more encapsulation in modules, and that
> really means lexical, not dynamic scoping. If a module includes classes from
> another module, I don't want the former to influence resources in the latter
> unexpectedly, via dynamically-inherited defaults.
Very much so.
>> and thus not inside a class that may include all your other classes? (we
>> have a module 'base' that does all the logic for which other classes should
>> be included)
>
> Some of this, I would imagine, can be done by parameterizing your other
> classes -- except the resource defaults, of course. Though for that I guess
> you could do:
>
> class app_x ($default_file_owner) {
> File { owner => $default_file_owner)
> ... other content ...
> }
This is basically the prime thing that's kept me from pulling the trigger on
switching to a lexical scope, I think - I've implemented it at least once in
the past.
> We have a different way of handling this here, though. I have a 'defaults'
> module with contents like:
>
> File { owner => 'root' }
> Exec { path => '/bin:/usr/bin:/sbin:/usr/sbin' }
> ... and so on ...
>
> And virtually all of our other classes inherit the defaults class (or some
> other class, which is itself a descendant of defaults). This saves typing,
> compacts our code a *lot*, and somewhat reduces errors due to forgetfulness.
I think it'd be very interesting to do a survey of how people use resource
defaults. I'm especially curious to see how many actually use it in individual
classes, rather than globally.
--
If computers get too powerful, we can organize them into a committee --
that will do them in. -- Bradley's Bromide
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Luke Kanies -|- http://puppetlabs.com -|- +1(615)594-8199
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