Puppet users - Jul 2009 - multi-case selectors

Hi-

I''ve been using Puppet for a few months now and am trying to work my
recipes into something a little more elegant and efficient.

One of the things I am trying to do is better selection.  What I would
really like to be able to do is sub-selection, but I can''t figure out
how it''s done.  For example, if I am doing a primary selection for
sources on $domain, but would like to treat a sub-category of that
selection differently by $hostname or something, how would that look?
In regular code, it would just be a nested if or something, but I''m
not seeing an easy way to do it in Puppet...

I''m thinking about it like this:

if $domain == "something" {
  if $hostname == "some_hostname"  {
    source => "some_source"
  } else {
    source => "another_source"
  }
}

Is there a "puppet" way to do this or am I thinking about this in the
wrong way?

Thanks!
Jay

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On Jul 21, 2009, at 1:00 PM, jc.listmail wrote:
>
> Hi-
>
> I''ve been using Puppet for a few months now and am trying to work
my
> recipes into something a little more elegant and efficient.
>
> One of the things I am trying to do is better selection.  What I would
> really like to be able to do is sub-selection, but I can''t figure
out
> how it''s done.  For example, if I am doing a primary selection for
> sources on $domain, but would like to treat a sub-category of that
> selection differently by $hostname or something, how would that look?
> In regular code, it would just be a nested if or something, but
I''m
> not seeing an easy way to do it in Puppet...
>
> I''m thinking about it like this:
>
> if $domain == "something" {
>  if $hostname == "some_hostname"  {
>    source => "some_source"
>  } else {
>    source => "another_source"
>  }
> }
>
> Is there a "puppet" way to do this or am I thinking about this in
the
> wrong way?
>
Puppet supports ANDs and ORs if you wish to do it instead of nesting.

http://reductivelabs.com/trac/puppet/wiki/LanguageTutorial#if-else

CASE statements are another method.

-L

--
Larry Ludwig
Reductive Labs


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