Puppet users - Aug 2011 - Question on accessing a variable from another class

Hi all,

I''m trying to promote module re-use so that if I have a module that
deals
with ldap and I have setup variables in a common configuration and I want to
access those same defaulted variables from another module I can easily do
so.

Below is how I''m *attempting* to do this and in MY opinion I think it
should
work ;-) Puppet feels differently and in my node where I include the class
rep I get an error back from puppet saying that it could not find the value
for ldap_cname in my template.

I believe this should work because the rep module includes the config which
includes the ldap::variables_common which should then define $ldap_cname and
the file /etc/rep.xml requires  ldap::variables_common before the template.

Can anybody kindly show me the error of my ways?

Thanks!
Chris

-- Examples Modules Below --

modules/ldap/manifests/init.pp:
class ldap {
   variables_common
}

class ldap::variables_common {
   if( !$ldap_cname) {
     $ldap_cname="admin"
  }
}


In file modules/rep/manifests/init.pp
class rep {
   include config
}

class rep::config {
   include ldap::variables_common

file {
     "/etc/rep.xml":
     ensure => file,
     require => Class["ldap::variables_common"],
     content => template("rep/test_template.xml.erb");
 }
}

modules/rep/templates/test_template.xml.erb
<?xml version="1.0"?>
<configuration>
   <test_template cname=''<%= ldap_cname %> />
</configuration>

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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
> modules/rep/templates/test_template.xml.erb
> <?xml version="1.0"?>
> <configuration>
>    <test_template cname=''<%= ldap_cname %> />
The template is in a different scope than ldap::variables_common, so
ldap_cname is not directly present like that and you need to use:

<test_template
cname=''<%scope.lookupvar(''ldap::variables_common::ldap_cname'')
%>

But for reusable modules etc. I would recommend you to look into hiera
[1] and to combine it with parametrized classes as shown in [2], it
makes it quite easy and really extensible.

~pete

[1]
http://www.devco.net/archives/2011/06/05/hiera_a_pluggable_hierarchical_data_store.php
[2] http://www.devco.net/archives/2011/06/06/puppet_backend_for_hiera.php
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