1 files changed, 25 insertions, 0 deletions
diff --git a/lib/bundler/fetcher/index.rb b/lib/bundler/fetcher/index.rb
index b37f6a84c1..1d8aa657a8 100644
--- a/lib/bundler/fetcher/index.rb
+++ b/lib/bundler/fetcher/index.rb
@@ -23,6 +23,31 @@ module Bundler
           raise HTTPError, "Could not fetch specs from #{display_uri}"
         end
       end
+
+      def fetch_spec(spec)
+        spec -= [nil, "ruby", ""]
+        spec_file_name = "#{spec.join "-"}.gemspec"
+
+        uri = URI.parse("#{remote_uri}#{Gem::MARSHAL_SPEC_DIR}#{spec_file_name}.rz")
+        if uri.scheme == "file"
+          Bundler.load_marshal Gem.inflate(Gem.read_binary(uri.path))
+        elsif cached_spec_path = gemspec_cached_path(spec_file_name)
+          Bundler.load_gemspec(cached_spec_path)
+        else
+          Bundler.load_marshal Gem.inflate(downloader.fetch(uri).body)
+        end
+      rescue MarshalError
+        raise HTTPError, "Gemspec #{spec} contained invalid data.\n" \
+          "Your network or your gem server is probably having issues right now."
+      end
+
+    private
+
+      # cached gem specification path, if one exists
+      def gemspec_cached_path(spec_file_name)
+        paths = Bundler.rubygems.spec_cache_dirs.map {|dir| File.join(dir, spec_file_name) }
+        paths.find {|path| File.file? path }
+      end
     end
   end
 end