Subject: Puppet conditionals on custom facts
======================================================================

I was getting Puppet to error out like a shell script is a challenge.  My favorite solution to date is creating a custom fact in a module's "lib/facter" sub directory.  Although there are other solutions, most involve a modicum of ruby coding.

To get Puppet to error out if /sys/kernel/mm/transparent_hugepage

exists, I had to create a custom fact. 

/opt/puppetlabs/code/environment/production/oradbms/modules/linode3/lib/facter/trans_huge_frame.rb

	Facter.add(:linode3_transparent_hugepage) do       setcode do
	if File.exist? '/sys/kernel/mm/transparent_hugepage'
	'/sys/kernel/mm/transparent_hugepage'
	else
	if File.exist? '/sys/kernel/mm/redhat_transparent_hugepage'
	'/sys/kernel/mm/redhat_transparent_hugepage'
	else
	#DEBUG if File.exist? '/sys/kernel/mm/page_idle' # This is just a test case
	#DEBUG    '/sys/kernel/mm/page_idle'
	#DEBUG else
	#DEBUG   'absent'
	#DEBUG end
	'absent'
	end
	end
	end
	end

The manifest code looks like

   if "${facts['linode3_transparent_hugepage']}" != 'absent' {

      fail("fail('ERROR: found file: ${facts['linode3_transparent_hugepage']}, meaning Transparent Huge Pages are enabled for an Oracle server, which is not allowed.")

   }

Hopefully that makes sense.