$ git clone -n https://src.fedoraproject.org/rpms/kf6-kdesu.git /var/lib/mock/f42-build-side-1-3503850-45982/root/chroot_tmpdir/scmroot/kf6-kdesu
Cloning into '/var/lib/mock/f42-build-side-1-3503850-45982/root/chroot_tmpdir/scmroot/kf6-kdesu'...
$ git fetch origin 1732cd3c94e7f0564d1550768f3de7886816602c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kdesu
 * [new ref]         1732cd3c94e7f0564d1550768f3de7886816602c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1732cd3 6.13.0