$ git clone -n https://src.fedoraproject.org/rpms/kf6-kio.git /var/lib/mock/f42-build-side-1-3511680-46059/root/chroot_tmpdir/scmroot/kf6-kio
Cloning into '/var/lib/mock/f42-build-side-1-3511680-46059/root/chroot_tmpdir/scmroot/kf6-kio'...
$ git fetch origin a6863163e6c588528e51aa05c6e7777199caf94b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kio
 * [new ref]         a6863163e6c588528e51aa05c6e7777199caf94b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a686316 Rebuild (qt6)