mkiso.rb

#!/usr/bin/env ruby
require 'fileutils'
require 'shellwords'
include FileUtils
#hdiutil makehybrid -iso -joliet -o image.iso /path/to/source

ARGV.each do |rootdir|
  cd rootdir do
    Dir["*"].each do |subdir|
      destination = "/Volumes/WD3T/ISOs/#{rootdir.shellescape}/"
      mkdir_p destination unless File.directory? destination
      puts "Dealing with \"#{subdir}\": "
      unless File.directory? subdir
        copied = system("cp #{subdir.shellescape} #{destination}")
        rm subdir if copied
      else
        result = system("hdiutil makehybrid -iso -joliet -o #{destination}#{subdir.shellescape}.iso #{subdir.shellescape}")
        rm_rf subdir if result
      end
    end
  end
end