Bundler issues from cron due to Dir.chdir(path) not "sticking" through a %x{} shell call

gistfile1.diff

--- /usr/lib/ruby/gems/1.9.1/gems/bundler-1.0.13/lib/bundler/source.rb  2011-05-19 13:55:32.560582929 +1000
+++ source.rb   2011-05-19 13:56:23.779939014 +1000
@@ -619,7 +619,7 @@
           return if has_revision_cached?
           Bundler.ui.info "Updating #{uri}"
           in_cache do
-            git %|fetch --force --quiet --tags "#{uri}" "refs/heads/*:refs/heads/*"|
+            git %|--git-dir "#{Dir.pwd}" fetch --force --quiet --tags "#{uri}" "refs/heads/*:refs/heads/*"|
           end
         else
           Bundler.ui.info "Fetching #{uri}"
@@ -634,14 +634,13 @@
           FileUtils.rm_rf(path)
           git %|clone --no-checkout "#{cache_path}" "#{path}"|
         end
-        Dir.chdir(path) do
-          git %|fetch --force --quiet --tags "#{cache_path}"|
-          git "reset --hard #{revision}"
+        dir_opts = %|--git-dir "#{path}/.git" --work-tree "#{path}"|
+        git %|#{dir_opts} fetch --force --quiet --tags "#{cache_path}"|
+        git "#{dir_opts} reset --hard #{revision}"

-          if @submodules
-            git "submodule init"
-            git "submodule update"
-          end
+        if @submodules
+          git "#{dir_opts} submodule init"
+          git "#{dir_opts} submodule update"
         end
       end

Forgot to note, the places I am setting --git-dir and --work-tree, need to escape the directory before passing to shell, just not sure the best way to escape it.