$ git clone -n https://src.fedoraproject.org/rpms/iotop-c.git /var/lib/mock/f42-build-side-1-3498273-45962/root/chroot_tmpdir/scmroot/iotop-c
Cloning into '/var/lib/mock/f42-build-side-1-3498273-45962/root/chroot_tmpdir/scmroot/iotop-c'...
$ git fetch origin e7070af5e2f7c23096115d824ab21a596d4b3415:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/iotop-c
 * [new ref]         e7070af5e2f7c23096115d824ab21a596d4b3415 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e7070af update for bin and sbin merge, fixes FTBFS