Prefer Monkey-patching Rack Gem to Vendored Rack

This gets around a dreaded 

  in `load_missing_constant': Rack
  is not missing constant Handler! (ArgumentError)

error in latest Ruby 1.9.2-dev. (Ruby
1.8.x doesn't seem to care.)

config/environment.rb

@@ -58,8 +58,11 @@ end
 require_dependency 'instiki_errors'
 
 #require 'jcode'
+
+# Miscellaneous monkey patches (here be dragons ...)
 require 'caching_stuff'
 require 'logging_stuff'
+require 'rack_stuff'
 
 #Additional Mime-types 
 mime_types = YAML.load_file(File.join(File.dirname(__FILE__), 'mime_types.yml'))

lib/rack_stuff.rb

@@ -0,0 +1,61 @@
+require 'webrick'
+require 'stringio'
+require 'rack/content_length'
+require 'tempfile'
+
+module Rack
+  module Handler
+    class WEBrick < ::WEBrick::HTTPServlet::AbstractServlet
+      def self.run(app, options={})
+        options[:BindAddress] = options.delete(:Host) if options[:Host]
+        server = ::WEBrick::HTTPServer.new(options)
+        server.mount "/", Rack::Handler::WEBrick, app
+        trap(:INT) { server.shutdown }
+        trap(:TERM) { server.shutdown }
+        yield server  if block_given?
+        server.start
+      end
+    end
+  end
+
+  class RewindableInput
+    def make_rewindable
+      # Buffer all data into a tempfile. Since this tempfile is private to this
+      # RewindableInput object, we chmod it so that nobody else can read or write
+      # it. On POSIX filesystems we also unlink the file so that it doesn't
+      # even have a file entry on the filesystem anymore, though we can still
+      # access it because we have the file handle open.
+      @rewindable_io = Tempfile.new('RackRewindableInput')
+      @rewindable_io.chmod(0000)
+      @rewindable_io.set_encoding(Encoding::BINARY) if @rewindable_io.respond_to?(:set_encoding)
+      @rewindable_io.binmode
+      if filesystem_has_posix_semantics? && !tempfile_unlink_contains_bug?
+        @rewindable_io.unlink
+        @unlinked = true
+      end
+      
+      buffer = ""
+      while @io.read(1024 * 4, buffer)
+        entire_buffer_written_out = false
+        while !entire_buffer_written_out
+          written = @rewindable_io.write(buffer)
+          entire_buffer_written_out = written == buffer.size
+          if !entire_buffer_written_out
+            buffer.slice!(0 .. written - 1)
+          end
+        end
+      end
+      @rewindable_io.rewind
+    end
+
+    def tempfile_unlink_contains_bug?
+      # The tempfile library as included in Ruby 1.9.1-p152 and later
+      # contains a bug: unlinking an open Tempfile object also closes
+      # it, which breaks our expected POSIX semantics. This problem
+      # has been fixed in Ruby 1.9.2, but the Ruby team chose not to
+      # include the bug fix in later versions of the 1.9.1 series.
+      ruby_engine = defined?(RUBY_ENGINE) ? RUBY_ENGINE : "ruby"
+      ruby_engine == "ruby" && RUBY_VERSION == "1.9.1" && RUBY_PATCHLEVEL >= 152
+    end
+  end
+end

vendor/rails/actionpack/lib/action_controller.rb

@@ -32,7 +32,7 @@ rescue LoadError
 end
 
 begin
-  gem 'rack', '~> 1.1.1'
+  gem 'rack', '~> 1.1.0'
   require 'rack'
 rescue Gem::LoadError
   $:.unshift "#{File.dirname(__FILE__)}/../../../plugins/rack/lib"