mount_volume.rb

ruby_block 'mount_install_unmount' do
  block do
    volumes_dir = new_resource.volumes_dir

    # Mount the image
    %x[hdiutil mount '#{dmg_file}'] unless %x[hdiutil info | grep -q 'image-path.*#{dmg_file}'].strip!

    # Get the volume name
    unless volumes_dir
      all_volumes = %x[hdiutil info -plist].gsub!(/(\t|\n)/, '')\
        .scan(/(?:<key>image-path<\/key>)<string>(.*?)<\/string>.*?(?:<key>mount-point<\/key>)<string>(.*?)<\/string>/)\
        .each do |image_path, mount_point|
          volumes_dir = mount_point if image_path == dmg_file
        end
    end

    # Install application
    case extension
    when ".mpkg"
      %x[sudo installer -pkg #{volumes_dir}/#{new_resource.app}.mpkg -target /]
    when ".prefPane"
      destination = ::File.expand_path('~/Library/PreferencePanes') if destination == '/Applications'
      FileUtils.cp_r "#{volumes_dir}/#{new_resource.app}#{extension}", destination
    else
      FileUtils.cp_r "#{volumes_dir}/#{new_resource.app}#{extension}", destination
    end

    # Unmount volume
    %x[hdiutil unmount '#{volumes_dir}']
  end
end