$ git clone -n https://src.fedoraproject.org/rpms/python-pysrt.git /var/lib/mock/f45-build-32559-660/root/chroot_tmpdir/scmroot/python-pysrt
Cloning into '/var/lib/mock/f45-build-32559-660/root/chroot_tmpdir/scmroot/python-pysrt'...
$ git fetch origin dd9d7a2b0585918881d37b77dc5a994cb069e288:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-pysrt
 * [new ref]         dd9d7a2b0585918881d37b77dc5a994cb069e288 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dd9d7a2 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild