gistfile1.rb

#!/usr/bin/env ruby
require 'net/http'
require 'rexml/document'

@cc_server = 'your-cc-server'

include REXML

def build_green?
  result = Net::HTTP.start(@cc_server, 8000) { |http| http.get('/XmlStatusReport.aspx') }
  root = Document.new(result.body).root
  
  root.elements.each do |e|    
    return false if e.attributes['lastBuildStatus'] == "Failure"
  end
  
  true
end

@build_is_broken = true

def green_build!
  if @build_is_broken
    @build_is_broken = false
    
    puts 'Build was fixed.'
    system "../tdtool --on 2 --off 3"
  end  
end

def red_build!
  unless @build_is_broken
    @build_is_broken = true
    puts 'Build was broken.'
    system "../tdtool --off 2 --on 3"    
  end
end

while true 
  begin 
    build_green? ? green_build! : red_build!  
  rescue
    puts "Failed to get build status..."
    sleep 10
  end
  sleep 1  
end