$ git clone -n https://src.fedoraproject.org/rpms/meshlab.git /var/lib/mock/f42-build-862923-171252/root/chroot_tmpdir/scmroot/meshlab
Cloning into '/var/lib/mock/f42-build-862923-171252/root/chroot_tmpdir/scmroot/meshlab'...
$ git fetch origin 12f139d267045621edf1a53e011cd04c0479c2f2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/meshlab
 * [new ref]         12f139d267045621edf1a53e011cd04c0479c2f2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 12f139d Rebuild for xerces-c 3.3