difftool: don't assume that default sh is sane

diff --git a/git-remote-testgit.sh b/git-remote-testgit.sh
index 1c006a0518e247d58759df98602f6dae3935caf6..a9c75a2360fec7a9ce5f22877a471f70bc405ff1 100755 (executable)
--- a/git-remote-testgit.sh
+++ b/git-remote-testgit.sh
@@ -13,7 +13,8 @@ refspec="${GIT_REMOTE_TESTGIT_REFSPEC-$default_refspec}"
 
 test -z "$refspec" && prefix="refs"
 
-export GIT_DIR="$url/.git"
+GIT_DIR="$url/.git"
+export GIT_DIR
 
 force=