$ git clone -n https://src.fedoraproject.org/rpms/kf6-knewstuff.git /var/lib/mock/f40-build-2198649-51704/root/chroot_tmpdir/scmroot/kf6-knewstuff
Cloning into '/var/lib/mock/f40-build-2198649-51704/root/chroot_tmpdir/scmroot/kf6-knewstuff'...
$ git fetch origin f5d6c5c05453b351ca2ed6466d446d0d85e1e38f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-knewstuff
 * [new ref]         f5d6c5c05453b351ca2ed6466d446d0d85e1e38f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f5d6c5c 5.247.0