Ruby Thor snippet to package code on OSX

package.rb

   desc "osx", "create distribution package for Mac OS X"
    method_option :dmg, :type => :boolean, :desc => "Create a DMG container instead of a zip file"
    def osx
      set_instance_variables

      # clean staging folder
      clean

      osx_copy_to_staging(@product)

      # get version info directly from JSON in staging folder in case this was build off a different version
      version_filename = File.join(STAGING_FOLDER, @product, 'version.txt')
      version = read_version_string(version_filename)
      label = options[:label]
      label = read_version_label(@product, version_filename) unless label
      label = ".#{label}" if label

      if options[:dmg]
        # create the dmg file
        source = File.join(STAGING_FOLDER, @product, "#{@product}.app".capitalize)
        destination = "#{PKG_FOLDER}/#{@product}.#{version}.osx#{label}.dmg"
        remove_file(destination)
        run("hdiutil create #{destination} -volname #{@product} -size 200m -fs HFS+ -srcfolder #{source}")
      else
        source = File.join(STAGING_FOLDER, @product)
        destination = "#{PKG_FOLDER}/#{@product}.#{version}.osx#{label}.zip"
        remove_file(destination)
        run "7za a -mx9 #{destination} #{source}"
      end
    end