$ git clone -n https://src.fedoraproject.org/rpms/iotop.git /var/lib/mock/f40-build-773163-126850/root/chroot_tmpdir/scmroot/iotop
Cloning into '/var/lib/mock/f40-build-773163-126850/root/chroot_tmpdir/scmroot/iotop'...
$ git fetch origin d41a57a31b2c4183a7860d946681e2bdb3cb12e0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/iotop
 * [new ref]         d41a57a31b2c4183a7860d946681e2bdb3cb12e0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d41a57a update to latest snapshot