Ruby function to extract a provisioning profile UUID from a .mobileprovision file and to dynamically generate an xcconfig file

profile_uuid.rb

# Extract a profile UUID from a mobileprovision file.
# Makes it easier to programatically build against a particular profile
# without having to install it manually.

require 'nokogiri'

def profile_uuid(provisioning_profile_path)
  profile_contents = File.open(provisioning_profile_path).read
  profile_contents = profile_contents.slice(profile_contents.index('<?'), profile_contents.length)
  doc = Nokogiri.XML(profile_contents)
  return doc.xpath('//key[text()="UUID"]')[0].next_element.text
end

xcconfig_gen.rb

# Generate an xcconfig file dynamically
require 'tempfile'

def xcconfig_file(config)
  file = Tempfile.new('xcconfig')
  if config[:provisioning_profile]
    file.write("PROVISIONING_PROFILE = #{profile_uuid(config[:provisioning_profile])}\n")
  end
  config[:xcconfig].each do |key, value|
    file.write("#{key} = #{value}\n")
  end
  file.close
  return file.path
end