Nagios Facter Check script using ruby-nagios-plugin -- untested

check_facter

#!/usr/bin/ruby

require 'facter'
require 'nagios-plugin'

Facter.search "/var/lib/puppet/lib/facter/"

class FacterPlugin < Nagios::Plugin
	def run
		result = nil
		fact_name = nil
		@opts.on("-f", "--fact_name FACT_NAME", "fact name") do |f|
			fact_name = f
			@shortname = f
		end
		@opts.on("-n", "--shortname SHORT_NAME", "Short name for result") do |s|
			@shortname = s
		end

		parse_argv()
		raise OptionParser::MissingArgument if @critical.nil?
		raise OptionParser::MissingArgument if @warning.nil?
		raise OptionParser::MissingArgument if fact_name.nil?

		begin
			result = Facter.value(fact_name)
		rescue
			Facter.loadfacts()
			result = Facter.value(fact_name)
		end

		if result.nil?
			unknown("Result unknown #{result}")
		elsif range_match(result, @critical)
			critical("Result out of bounds #{result} #{@critical}")
		elsif range_match(result, @warning)
			warning("Result out of bounds #{result} #{@warning}")
		end

		ok("#{result}")
	end
end

@plugin = FacterPlugin.new
@plugin.run