# File lib/chef/mixin/command.rb, line 173
      def handle_command_failures(status, command_output, opts={})
        unless opts[:ignore_failure]
          opts[:returns] ||= 0
          unless Array(opts[:returns]).include?(status.exitstatus)
            # if the log level is not debug, through output of command when we fail
            output = ""
            if Chef::Log.level == :debug || opts[:output_on_failure]
              output << "\n---- Begin output of #{opts[:command]} ----\n"
              output << command_output.to_s
              output << "\n---- End output of #{opts[:command]} ----\n"
            end
            raise Chef::Exceptions::Exec, "#{opts[:command]} returned #{status.exitstatus}, expected #{opts[:returns]}#{output}"
          end
        end
      end