$ git clone -n https://src.fedoraproject.org/rpms/Cython.git /var/lib/mock/f40-build-730390-103195/root/chroot_tmpdir/scmroot/Cython
Cloning into '/var/lib/mock/f40-build-730390-103195/root/chroot_tmpdir/scmroot/Cython'...
$ git fetch origin 8319632a829a764bdb87827a6577f772267f50b7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/Cython
 * [new ref]         8319632a829a764bdb87827a6577f772267f50b7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8319632 Update to 3.0.2