$ git clone -n https://src.fedoraproject.org/rpms/kf6-kpackage.git /var/lib/mock/f42-build-side-1-3573588-46768/root/chroot_tmpdir/scmroot/kf6-kpackage
Cloning into '/var/lib/mock/f42-build-side-1-3573588-46768/root/chroot_tmpdir/scmroot/kf6-kpackage'...
$ git fetch origin d200d0390351a403efe32fdbe26b714e35047fae:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kpackage
 * [new ref]         d200d0390351a403efe32fdbe26b714e35047fae -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d200d03 6.15 and plasma 3.4 compatibility rebuild