$ git clone -n https://src.fedoraproject.org/rpms/kf6-kwindowsystem.git /var/lib/mock/f40-build-2264073-54547/root/chroot_tmpdir/scmroot/kf6-kwindowsystem
Cloning into '/var/lib/mock/f40-build-2264073-54547/root/chroot_tmpdir/scmroot/kf6-kwindowsystem'...
$ git fetch origin 09fb7a417945d108833e04676d8ddf5a3a288a6b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kwindowsystem
 * [new ref]         09fb7a417945d108833e04676d8ddf5a3a288a6b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 09fb7a4 5.248.0