$ git clone -n https://src.fedoraproject.org/rpms/librist.git /var/lib/mock/f45-build-43644-804/root/chroot_tmpdir/scmroot/librist
Cloning into '/var/lib/mock/f45-build-43644-804/root/chroot_tmpdir/scmroot/librist'...
$ git fetch origin 8e5548743726c5bba29efd255d07a17e19cdd9f7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/librist
 * [new ref]         8e5548743726c5bba29efd255d07a17e19cdd9f7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8e55487 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild