$ git clone -n https://src.fedoraproject.org/rpms/python-pycdlib.git /var/lib/mock/f45-build-32071-657/root/chroot_tmpdir/scmroot/python-pycdlib
Cloning into '/var/lib/mock/f45-build-32071-657/root/chroot_tmpdir/scmroot/python-pycdlib'...
$ git fetch origin 5823847bfdf7ebee67dfe5f49d5d4c101db77f8e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-pycdlib
 * [new ref]         5823847bfdf7ebee67dfe5f49d5d4c101db77f8e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5823847 Update to 1.20.0 (rhbz#2511649)