$ git clone -n https://src.fedoraproject.org/rpms/ckb-next.git /var/lib/mock/f40-build-769836-125783/root/chroot_tmpdir/scmroot/ckb-next
Cloning into '/var/lib/mock/f40-build-769836-125783/root/chroot_tmpdir/scmroot/ckb-next'...
$ git fetch origin 8b877bd7ce82f72901ad0b80611dc4058a3c9129:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ckb-next
 * [new ref]         8b877bd7ce82f72901ad0b80611dc4058a3c9129 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8b877bd Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild