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def self.capture_system(*args)
  args = args.flatten.compact.collect { |arg| arg.to_s }
  return false if args.blank?

  rd, wr = IO.pipe

  pid = fork do
    rd.close
    $stdout.reopen wr
    $stderr.reopen wr
    yield if block_given?
    exec(*args) rescue nil
    exit! 1 # never gets here unless exec threw or failed
  end

  wr.close
  out = String.new
  out << rd.read until rd.eof?
  Process.wait
  raise unless $?.success?
  out
end