Facter does everything it can to make adding custom facts easy. It will autoload any files it finds in a ``facter/`` directory in its search path, so you don’t need to modify the package files. Also, Facter will search through your environment for any variables whose names start with ‘FACTER_’ (case insensitive) and automatically add those facts.
As a simple example, here is how I publish my home directory to Puppet:
Facter.add("home") do
setcode do
ENV['HOME']
end
endI have ~/lib/ruby in my $RUBYLIB environment variable, so I just created ~/lib/ruby/facter and dropped the above code into a ``home.rb`` file within that directory.