Fix plugin loading in a Rails 2.3.x project [closes GH-176]

CHANGELOG.md

@@ -1,6 +1,6 @@
 ## 0.6.5 (unreleased)
 
-
+  - Fix plugin loading in a Rails 2.3.x project. [GH-176]
 
 ## 0.6.4 (October 4, 2010)
 

lib/vagrant/plugin.rb

@@ -21,15 +21,22 @@ module Vagrant
     # load path. This file is loaded to kick off the load sequence
     # for that plugin.
     def self.load!
+      # Stupid hack since Rails 2.3.x overrides Gem.source_index with their
+      # own incomplete replacement which causes issues.
+      index = Gem.source_index
+      index = [index.installed_source_index, index.vendor_source_index] if defined?(Rails::VendorGemSourceIndex) && index.is_a?(Rails::VendorGemSourceIndex)
+
       # Look for a vagrant_init.rb in all the gems, but only the
       # latest version of the gems.
-      Gem.source_index.latest_specs.each do |spec|
+      [index].flatten.each do |source|
+        source.latest_specs.each do |spec|
           file = Gem.searcher.matching_files(spec, "vagrant_init.rb").first
           next if !file
 
           @@plugins << new(spec, file)
         end
       end
+    end
 
     # Returns the array of plugins which are currently loaded by
     # Vagrant.