Re: [PATCH v2] filter-branch -d: Export GIT_DIR earlier

>The improved error handling catches a bug in filter-branch when using
>-d pointing to a path outside any git repository:
>
>$ mkdir foo
>$ cd foo
>$ git init
>$ touch bar
>$ git add bar
>$ git commit -m bar
>$ cd ..
>$ git clone --bare foo
>$ cd foo.git
>$ git filter-branch -d /tmp/filter master
>fatal: Not a git repository (or any of the parent directories): .git
>
>This error message comes from git for-each-ref in line 224. GIT_DIR is
>set correctly by git-sh-setup (to the foo.git repository), but not
>exported (yet).