$ git clone -n https://src.fedoraproject.org/rpms/kf6-prison.git /var/lib/mock/f41-build-side-114591-60926035-6585985/root/chroot_tmpdir/scmroot/kf6-prison
Cloning into '/var/lib/mock/f41-build-side-114591-60926035-6585985/root/chroot_tmpdir/scmroot/kf6-prison'...
$ git fetch origin 40b7f17a3c4066f1c654acfad93d02f2ded1cf1e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-prison
 * [new ref]         40b7f17a3c4066f1c654acfad93d02f2ded1cf1e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 40b7f17 6.16.0