facter.rb

require 'fileutils'

# Install the 'facter' gem if not already installed. Facter assists in automatically determining the RAM and CPUs
# to use for the VM.

facter_plugins = `vagrant plugin list | grep facter`.tr("\n","")
unless facter_plugins.length > 0
  puts "The 'facter' gem is not yet installed; installing..."
  system 'vagrant', 'plugin', 'install', 'facter'
end

require 'rubygems'
require 'facter' # Message: LoadError: cannot load such file -- facter

# ... more code ...