$ git clone -n https://src.fedoraproject.org/rpms/kf6-knewstuff.git /var/lib/mock/f40-build-744461-111727/root/chroot_tmpdir/scmroot/kf6-knewstuff
Cloning into '/var/lib/mock/f40-build-744461-111727/root/chroot_tmpdir/scmroot/kf6-knewstuff'...
$ git fetch origin 987c37cec54fb7864bb898161b1a42a781e02249:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-knewstuff
 * [new ref]         987c37cec54fb7864bb898161b1a42a781e02249 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 987c37c 5.245.0