$ git clone -n https://src.fedoraproject.org/rpms/plexus-sec-dispatcher.git /var/lib/mock/f42-build-3348063-45005/root/chroot_tmpdir/scmroot/plexus-sec-dispatcher
Cloning into '/var/lib/mock/f42-build-3348063-45005/root/chroot_tmpdir/scmroot/plexus-sec-dispatcher'...
$ git fetch origin b63ea1c2a927adddcea628b325fc793267c6a1f6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plexus-sec-dispatcher
 * [new ref]         b63ea1c2a927adddcea628b325fc793267c6a1f6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b63ea1c Remove javadoc subpackage