$ git clone -n https://src.fedoraproject.org/rpms/kf6-kpackage.git /var/lib/mock/f40-build-788152-135049/root/chroot_tmpdir/scmroot/kf6-kpackage
Cloning into '/var/lib/mock/f40-build-788152-135049/root/chroot_tmpdir/scmroot/kf6-kpackage'...
$ git fetch origin fc0edd7ba0b9aae5493245ec883170748bb4e284:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kpackage
 * [new ref]         fc0edd7ba0b9aae5493245ec883170748bb4e284 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fc0edd7 6.0.0