generate a facter fact for every package on a host

yum_package_version.rb

IO.popen("/bin/rpm -qa --qf='%{name} '").read.split(' ').each do |package|
  Facter.add("yum_#{package}_version") do
    setcode do
      puts IO.popen("/bin/rpm -q --qf=\'%|epoch?{%{epoch}}:{0}|:%{version}-%{release}.%{arch}\' #{package}").read
    end
  end
end