$ git clone -n https://src.fedoraproject.org/rpms/plexus-io.git /var/lib/mock/f40-build-2134887-50815/root/chroot_tmpdir/scmroot/plexus-io
Cloning into '/var/lib/mock/f40-build-2134887-50815/root/chroot_tmpdir/scmroot/plexus-io'...
$ git fetch origin 39e02c74010ca3f69bc6d47f501128664591cf46:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plexus-io
 * [new ref]         39e02c74010ca3f69bc6d47f501128664591cf46 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 39e02c7 Update javapackages test plan to f40