Read Info.plist and get a version number from a packaged iOS app distribution file(.ipa).

get_app_version.rake

desc "Check binary version."
task :get_ver do
  require 'rubygems'
  require 'zip'
  require 'pathname'
  require 'cfpropertylist'

  Zip::File.open('build/iPhoneOS-8.0-Release/WH.ipa') do |file|
    plist = file.get_entry('Payload/WH.app/Info.plist')
    content = CFPropertyList::List.new(format: CFPropertyList::List::FORMAT_BINARY, data: plist.get_input_stream.read)
    data    = CFPropertyList.native_types(content.value)
    data.each do |k, v|
      puts "#{k} : #{v}"
    end
    puts "------"
    puts data['CFBundleName']
    puts data['CFBundleIdentifier']
    puts data['CFBundleVersion']
  end
end