Puppet users - Oct 2011 - Exporting variables between manifests/nodes to fill an erb template

Hello,
Here is what I am trying to do:
- in a class aptdater::client I want to export the $fqdn
- in a class aptdater::master I want to retrieve all the exported $fqdn 
  to fill an erb template of a configuration file

Here is what I tried:
# modules/aptdater/manifests/init.pp
class aptdater {
  # some not relevant resources
}

# modules/aptdater/manifests/master.pp
class aptdater::master inherits aptdater {
  # list of hosts that will be added to the hosts.conf
  $hosts = [$fqdn]
  (...)
}

# modules/aptdater/manifests/client.pp
class aptdater::client inherits aptdater {
  $aptdater::master::hosts += $fqdn
  (...)

# modules/aptdater/templates/hosts.conf.erb
[Hosts]
Hosts=<% scope.lookupvar(''aptdater::master::hosts'').each do
|i| -%>
<%= i + ";" -%>
<% end -%>

I have two nodes:
# manifests/nodes/master.node.plop.org.pp
node ''master.node.plop.org'' {
    include aptdater::master
}

# manifests/nodes/client.node.plop.org.pp
node ''client.node.plop.org'' {
    include aptdater::client
}

But it does not work, the Hosts line does only contain the $fqdn of the
master node.

But it does not work, the Hosts line does only contain the $fqdn of the
master node.

I took a look at exported resource, but here it''s not a resource that I
want to be exported, it''s just a variable/fact.

Is this possible to achieve such a goal?

Thanks,
Baptiste

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