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Run a custom fact based on core facts

So what if my previous example puppet custom fact easy as 1 2 3, needs to be run only on RedHat systems?

An additional line on the ruby file is added:

Facter.add('netuuid') do
   confine :operatingsystem => "RedHat"
   setcode do
      Facter::Core::Execution.exec("echo `grep UUID /etc/sysconfig/network-scripts/ifcfg-eth0 | cut -c 7-42`")
   end
end

 Any core fact can be referenced with the colon and name of the fact
:operatingsystem
:osfamily
:kernel
etc.

Puppet custom fact easy as 1, 2, 3.

After taking a careful reading at creating a custom fact. The solution was as follows to get the net uuid from /etc/sysconfig/network-scripts/ifcfg-eth0:

My custom fact stored on <modulepath>/<module>/lib/facter/netuuid.rb:
Facter.add('netuuid') do
        setcode do
                Facter::Core::Execution.exec("echo `grep UUID /etc/sysconfig/network-scripts/ifcfg-eth0 | cut -c 7-42`")
        end
end

I have created the <modulepath>/<module>/templates/netuuid.erb with this content:
<%= netuuid %>

And then call my custom netuuid facter variable on a template inside a manifest:
class netuuid {
        file { '/tmp/netuuid':
                        path    => '/tmp/netuuid',
                        ensure  => file,
                        content => template("module1/netuuid.erb"),
                }
}

# cat /tmp/netuuid
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