$ git clone -n https://src.fedoraproject.org/rpms/kf6-kio.git /var/lib/mock/f42-build-side-1-3573580-46768/root/chroot_tmpdir/scmroot/kf6-kio
Cloning into '/var/lib/mock/f42-build-side-1-3573580-46768/root/chroot_tmpdir/scmroot/kf6-kio'...
$ git fetch origin 9bffa2c3d34899c192a33ea4a1615ea04ceb3c05:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kio
 * [new ref]         9bffa2c3d34899c192a33ea4a1615ea04ceb3c05 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9bffa2c 6.15 and plasma 3.4 compatibility rebuild