$ git clone -n https://src.fedoraproject.org/rpms/ckb-next.git /var/lib/mock/f45-build-3904-329/root/chroot_tmpdir/scmroot/ckb-next
Cloning into '/var/lib/mock/f45-build-3904-329/root/chroot_tmpdir/scmroot/ckb-next'...
$ git fetch origin f8dcdc3224efd45dad360d74d9f7f3a26c475892:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ckb-next
 * [new ref]         f8dcdc3224efd45dad360d74d9f7f3a26c475892 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f8dcdc3 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild