$ git clone -n https://src.fedoraproject.org/rpms/kf6-kwindowsystem.git /var/lib/mock/f40-build-2198710-51704/root/chroot_tmpdir/scmroot/kf6-kwindowsystem
Cloning into '/var/lib/mock/f40-build-2198710-51704/root/chroot_tmpdir/scmroot/kf6-kwindowsystem'...
$ git fetch origin c5147b23df0d1458b9cbe7cdc819b4fc8f8ae02c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kwindowsystem
 * [new ref]         c5147b23df0d1458b9cbe7cdc819b4fc8f8ae02c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c5147b2 5.247.0