git-svn and --bare repositories

How do I do a git svn fetch to a bare test.git repository created with :-

    git --git-dir test.git --bare init --shared=true

I have tried :-

   git --git-dir test.git svn fetch http://test.org/git/test

and

   git --git-dir test.git/svn svn fetch http://test.org/git/test     /// 
fictious address :)

but neither work.

As you may guess I am not really sure what I am doing here.

Many thanks in advance,

Aaron