Hack to get ec2 tags to facter.

ec2tags.rb

require 'facter'

instance_id = Facter::Util::Resolution.exec("ec2-metadata -i | awk '{print $2}'")
tags = Facter::Util::Resolution.exec("ec2-describe-tags --region eu-west-1 --filter \"resource-id=#{instance_id}\" | cut -f 4-")

tags.scan(/(\w+)\s+(\w+)/) do |key, value|
 fact = "ec2_tag_#{key}"
 Facter.add(fact) { setcode { value } }
end

https://gist.github.com/zarmstrong/6893172

I've forked this to take into account non-word (\w) characters in key or value. It replaces the field separator " " (space) with | (pipe).