Expose the location of your home directory

Facter will automatically search for extra facts in all of Ruby's search paths. Create a ruby library directory in your home directory:

mkdir -p ~/lib/ruby/facter

And then add it to your Ruby search path:

export RUBYLIB=$RUBYLIB:~/lib/ruby

Lastly, create this file at ~/lib/ruby/facter/home.rb:

    require 'facter'

    Facter.add("home") do
        setcode do
            ENV['HOME']
        end
    end

It is now available as a fact:

    luke@culain(0) $ facter home
    /home/luke
    luke@culain(0) $