$ git clone -n https://src.fedoraproject.org/rpms/iotop-c.git /var/lib/mock/f40-build-752663-116816/root/chroot_tmpdir/scmroot/iotop-c
Cloning into '/var/lib/mock/f40-build-752663-116816/root/chroot_tmpdir/scmroot/iotop-c'...
$ git fetch origin ba4d8551529d891ae78e5dd4cda6e22559172423:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/iotop-c
 * [new ref]         ba4d8551529d891ae78e5dd4cda6e22559172423 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ba4d855 version 1.25