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root / config / boot.rb @ master

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# Don't change this file!
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# Configure your app in config/environment.rb and config/environments/*.rb
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RAILS_ROOT = "#{File.dirname(__FILE__)}/.." unless defined?(RAILS_ROOT)
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module Rails
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  class << self
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    def boot!
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      unless booted?
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        preinitialize
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        pick_boot.run
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      end
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    end
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    def booted?
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      defined? Rails::Initializer
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    end
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    def pick_boot
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      (vendor_rails? ? VendorBoot : GemBoot).new
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    end
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    def vendor_rails?
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      File.exist?("#{RAILS_ROOT}/vendor/rails")
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    end
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    def preinitialize
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      load(preinitializer_path) if File.exist?(preinitializer_path)
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    end
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    def preinitializer_path
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      "#{RAILS_ROOT}/config/preinitializer.rb"
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    end
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  end
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  class Boot
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    def run
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      load_initializer
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      Rails::Initializer.run(:set_load_path)
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    end
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  end
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  class VendorBoot < Boot
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    def load_initializer
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      require "#{RAILS_ROOT}/vendor/rails/railties/lib/initializer"
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      Rails::Initializer.run(:install_gem_spec_stubs)
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      Rails::GemDependency.add_frozen_gem_path
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    end
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  end
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  class GemBoot < Boot
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    def load_initializer
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      self.class.load_rubygems
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      load_rails_gem
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      require 'initializer'
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    end
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    def load_rails_gem
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      if version = self.class.gem_version
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        gem 'rails', version
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      else
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        gem 'rails'
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      end
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    rescue Gem::LoadError => load_error
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      $stderr.puts %(Missing the Rails #{version} gem. Please `gem install -v=#{version} rails`, update your RAILS_GEM_VERSION setting in config/environment.rb for the Rails version you do have installed, or comment out RAILS_GEM_VERSION to use the latest version installed.)
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      exit 1
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    end
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    class << self
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      def rubygems_version
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        Gem::RubyGemsVersion rescue nil
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      end
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      def gem_version
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        if defined? RAILS_GEM_VERSION
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          RAILS_GEM_VERSION
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        elsif ENV.include?('RAILS_GEM_VERSION')
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          ENV['RAILS_GEM_VERSION']
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        else
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          parse_gem_version(read_environment_rb)
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        end
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      end
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      def load_rubygems
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        min_version = '1.3.2'
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        require 'rubygems'
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        unless rubygems_version >= min_version
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          $stderr.puts %Q(Rails requires RubyGems >= #{min_version} (you have #{rubygems_version}). Please `gem update --system` and try again.)
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          exit 1
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        end
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      rescue LoadError
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        $stderr.puts %Q(Rails requires RubyGems >= #{min_version}. Please install RubyGems and try again: http://rubygems.rubyforge.org)
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        exit 1
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      end
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      def parse_gem_version(text)
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        $1 if text =~ /^[^#]*RAILS_GEM_VERSION\s*=\s*["']([!~<>=]*\s*[\d.]+)["']/
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      end
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      private
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        def read_environment_rb
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          File.read("#{RAILS_ROOT}/config/environment.rb")
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        end
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    end
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  end
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end
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# All that for this:
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Rails.boot!
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