Using Fabric to update a remote svn checkout with ssh public key authentication

For our subversion repositories we only allow users to connect through ssh public key login. We are switching towards using Fabric for doing automated deployments (in combination with zc.buildout, which we already use). Unfortunately it seems that both Fabric and paramiko, the python library Fabric uses for making ssh connections, don't support the ForwardAgent option in ~/.ssh/config which allows you to forward your ssh-agent to …