$ git clone -n https://src.fedoraproject.org/rpms/kf6-knewstuff.git /var/lib/mock/f41-build-839227-160093/root/chroot_tmpdir/scmroot/kf6-knewstuff
Cloning into '/var/lib/mock/f41-build-839227-160093/root/chroot_tmpdir/scmroot/kf6-knewstuff'...
$ git fetch origin 230dae19341c4169336c841c5c31e23b85833ab0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-knewstuff
 * [new ref]         230dae19341c4169336c841c5c31e23b85833ab0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 230dae1 6.5.0