$ git clone -n https://src.fedoraproject.org/rpms/python-psycopg2.git /var/lib/mock/f40-build-2205159-51987/root/chroot_tmpdir/scmroot/python-psycopg2
Cloning into '/var/lib/mock/f40-build-2205159-51987/root/chroot_tmpdir/scmroot/python-psycopg2'...
$ git fetch origin 99cb3252fb6fe66628b36fcc0bfda8eff4ed0d97:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-psycopg2
 * [new ref]         99cb3252fb6fe66628b36fcc0bfda8eff4ed0d97 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 99cb325 Rebase to the latest upstream version