On Dec 13, 2010, at 4:07 PM, Dan Bode wrote:
>
>
> On Mon, Dec 13, 2010 at 3:39 PM, Luke Kanies <[email protected]> wrote:
> On Dec 13, 2010, at 2:00 PM, Dan Bode wrote:
>
> > Hi all,
> >
> > I was trying to figure out how to include parametrized classes. I
> > eventually got it to work with the following syntax, but I don't understand
> > what it does (I tried to read the code). Can someone explain the magic of
> > known_resource_types?
> >
> > classes.each do |name, params|
> > klass = Puppet::Resource::Type.new(:hostclass, name, params)
> > known_resource_types.add klass
> > end
> Is this from a function, or what? There's clearly context missing here
> (e.g., where do 'params' come from? how is 'classes' created?)
>
> names, and params all come from an external node classifier (I am trying to
> patch ENC support for param classes)
>
> This is actually called form the compiler class. When I get it properly
> sorted, I will submit a patch.
If your goal is to evaluate a parameterized class, it's, um, apparently pretty
annoyingly complicated. At least, if the parameterized class has a parent
class it is. Look at the 'ensure_in_catalog' method in
lib/puppet/resource/type.rb in the current master branch for an example of how
it's done when there aren't parameters.
Paul - would it be possible to extend that method to accept parameters, and
then promote it as an API method for use in things like functions?
> This shouldn't actually cause class evaluation during parsing - it just
> creates the class,
>
> what does it mean to create a class in this context?
It's equivalent to declaring a class (e.g., "class foo {}"), rather than
'including' it.
--
Between two evils, I always pick the one I never tried before.
-- Mae West
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Luke Kanies -|- http://puppetlabs.com -|- +1(615)594-8199
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