speed: don't fetch git repos if a specified ref is already checked out

1 files changed, 5 insertions, 1 deletions

diff --git a/lib/bundler/source.rb b/lib/bundler/source.rb
index 774ec86c24..a8afa17666 100644
--- a/lib/bundler/source.rb
+++ b/lib/bundler/source.rb
@@ -333,7 +333,7 @@ module Bundler
     private
       def update
         if location.directory?
-          fetch
+          fetch if @ref && current_revision != @ref
         else
           clone
         end
@@ -350,6 +350,10 @@ module Bundler
         `git clone #{@uri} #{location} --no-hardlinks`
       end
 
+      def current_revision
+        Dir.chdir(location) { `git rev-parse HEAD`.strip }
+      end
+      
       def checkout
         Dir.chdir(location) { `git checkout --quiet #{@ref}` }
       end