lib/bundler/source/rubygems.rb in bundler-1.6.0.pre.2 vs lib/bundler/source/rubygems.rb in bundler-1.6.0.rc

@@ -112,10 +112,14 @@
         spec.loaded_from = "#{Bundler.rubygems.gem_dir}/specifications/#{spec.full_name}.gemspec"
         ["Installing #{version_message(spec)}", spec.post_install_message]
       end
 
       def cache(spec, custom_path = nil)
+        # Gems bundled with Ruby don't have .gem files cached locally, but it doesn't matter
+        # since they're always going to be installed on this Ruby version.
+        return if builtin_gem?(spec)
+
         cached_path = cached_gem(spec)
         raise GemNotFound, "Missing gem file '#{spec.full_name}.gem'." unless cached_path
         return if File.dirname(cached_path) == Bundler.app_cache.to_s
         Bundler.ui.info "  * #{File.basename(cached_path)}"
         FileUtils.cp(cached_path, Bundler.app_cache(custom_path))
@@ -271,8 +275,15 @@
         ensure
           Bundler.rubygems.sources = old
         end
       end
 
+      def builtin_gem?(spec)
+        # Ruby 2.1-style
+        return true if spec.summary =~ /is bundled with Ruby/
+
+        # Ruby 2.0 style
+        spec.loaded_from.include?("specifications/default/")
+      end
     end
   end
 end