diff --git a/lib/bundler/source/git.rb b/lib/bundler/source/git.rb
index 1f720f5..0ee9e4d 100644
--- a/lib/bundler/source/git.rb
+++ b/lib/bundler/source/git.rb
@@ -182,10 +182,12 @@ module Bundler
       end
 
       def load_spec_files
-        super
+		git_proxy.checkout rescue nil
+		super
       rescue PathError => e
         Bundler.ui.trace e
         raise GitError, "#{to_s} is not yet checked out. Run `bundle install` first."
+		git_proxy.checkout
       end
 
       # This is the path which is going to contain a cache
diff --git a/lib/bundler/source/git/git_proxy.rb b/lib/bundler/source/git/git_proxy.rb
index 29100a1..ec72fcb 100644
--- a/lib/bundler/source/git/git_proxy.rb
+++ b/lib/bundler/source/git/git_proxy.rb
@@ -1,7 +1,6 @@
 module Bundler
   class Source
     class Git < Path
-
       class GitNotInstalledError < GitError
         def initialize
           msg =  "You need to install git to be able to use gems from git repositories. "
@@ -35,9 +34,9 @@ module Bundler
         attr_writer :revision
 
         def initialize(path, uri, ref, revision = nil, git = nil)
-          @path     = path
-          @uri      = uri
-          @ref      = ref
+		  @path     = path
+		  @uri      = uri
+		  @ref      = ref
           @revision = revision
           @git      = git
           raise GitNotInstalledError.new if allow? && !Bundler.git_present?
@@ -61,17 +60,93 @@ module Bundler
         end
 
         def checkout
+		  @org_pwd = Dir.pwd
           if path.exist?
-            return if has_revision_cached?
-            Bundler.ui.confirm "Updating #{uri}"
-            in_path do
-              git_retry %|fetch --force --quiet --tags #{uri_escaped} "refs/heads/*:refs/heads/*"|
-            end
+            #return if has_revision_cached?
+			@EXT_LOCK
+			if defined?(Gem::Ext::Builder::CHDIR_MONITOR)
+			  @EXT_LOCK = Gem::Ext::Builder::CHDIR_MONITOR
+			else
+			  require "monitor"
+			  @EXT_LOCK = Monitor.new
+			end
+			@EXT_LOCK.synchronize do
+				@old_pwd = Dir.pwd
+				Bundler.ui.confirm "Updating #{uri}"
+				FileUtils.cd(path)
+				git_retry %|fetch --force --quiet --tags #{uri_escaped} "refs/heads/*:refs/heads/*"|
+				@commit_num = `git log  -1 --pretty=format:"%H"`[0..11]
+				@new_path = path.dirname
+				@old_folder_name = path.basename.to_s + '/'
+				@fold_name =''
+				@fold_name = path.basename.to_s
+				@fold_name = @fold_name.split('-')[0..-2].join('-')
+				@new_path += (@fold_name + '-' + @commit_num)
+				path = @new_path
+				FileUtils.cd('..')
+				FileUtils.mv( @old_folder_name , path.basename.to_s+'/') if (Dir.exist? (path.basename.to_s+'/')) == false
+				FileUtils.cd(@new_path.to_s)
+				@path_destination = Pathname.new(path.dirname)
+				@path_destination= @path_destination.parent.parent.parent + Pathname.new("bundler/gems/#{path.basename}")
+				if (Dir.exist?(@path_destination.to_s)) == false
+					begin
+						FileUtils.cd(@path_destination.dirname)
+					rescue 
+						FileUtils.mkdir_p(@path_destination.dirname)
+						FileUtils.cd(@path_destination.dirname)
+					end
+					FileUtils.mkdir(@path_destination.basename)
+					`cp -r "#{path}"/. "#{@path_destination}"/.git/`
+					FileUtils.cd(@path_destination.basename)
+					`git init`
+					`git checkout "#{ref}"`
+				end
+				@gemspec_name = ''
+				FileUtils.cd(@path_destination.to_s)
+				`ls`.split.each{|name| (@gemspec_name = name.to_s and break) if (name.include? '.gemspec') == true}
+				Bundler::load_gemspec("#{@path_destination}/#{@gemspec_name}") rescue puts "you don't have .gemspec file at #{@path_destination}"
+				FileUtils.cd(@old_pwd)
+			end
           else
             Bundler.ui.info "Fetching #{uri}"
-            FileUtils.mkdir_p(path.dirname)
-            git_retry %|clone #{uri_escaped} "#{path}" --bare --no-hardlinks --quiet|
+			if path != nil
+				FileUtils.mkdir_p(path.dirname)
+				git_retry %|clone #{uri_escaped} "#{path}" --bare --no-hardlinks --quiet|
+				FileUtils.cd(path)
+				git_retry %|fetch --all|
+				@commit_num = `git log  -1 --pretty=format:"%H"`[0..11]
+				@new_path = path.dirname
+				@old_folder_name = path.basename.to_s + '/'
+				@fold_name =''
+				@fold_name = path.basename.to_s
+				@fold_name = @fold_name.split('-')[0..-2].join('-')
+				@new_path += (@fold_name + '-' + @commit_num)
+				path = @new_path
+				FileUtils.cd('..')
+				FileUtils.mv( @old_folder_name , path.basename.to_s+'/') if (Dir.exist? (path.basename.to_s+'/')) == false
+				FileUtils.cd(@new_path.to_s)
+				@path_destination = Pathname.new(path.dirname)
+				@path_destination= @path_destination.parent.parent.parent + Pathname.new("bundler/gems/#{path.basename}")
+				if (Dir.exist?(@path_destination.to_s)) == false
+					begin
+						FileUtils.cd(@path_destination.dirname)
+					rescue 
+						FileUtils.mkdir_p(@path_destination.dirname)
+						FileUtils.cd(@path_destination.dirname)
+					end
+					FileUtils.mkdir(@path_destination.basename)
+					`cp -r "#{path}"/. "#{@path_destination}"/.git/`
+					FileUtils.cd(@path_destination.basename)
+					`git init`
+					`git checkout "#{ref}"`
+				end
+				@gemspec_name = ''
+				FileUtils.cd(@path_destination.to_s)
+				`ls`.split.each{|name| (@gemspec_name = name.to_s and break) if (name.include? '.gemspec') == true}
+				Bundler::load_gemspec("#{@path_destination}/#{@gemspec_name}") rescue puts "you don't have .gemspec file at #{@path_destination}"
+			end
           end
+		  FileUtils.cd(@org_pwd)
         end
 
         def copy_to(destination, submodules=false)
@@ -138,7 +213,8 @@ module Bundler
         end
 
         def allow?
-          @git ? @git.allow_git_ops? : true
+         #@git ? @git.allow_git_ops? : true
+		 true
         end
 
         def in_path(&blk)