$ git clone -n https://src.fedoraproject.org/rpms/OpenImageIO.git /var/lib/mock/f40-build-2365091-60368/root/chroot_tmpdir/scmroot/OpenImageIO
Cloning into '/var/lib/mock/f40-build-2365091-60368/root/chroot_tmpdir/scmroot/OpenImageIO'...
$ git fetch origin 635acc95eec06ef9feee403e1ac9fd1ba81f27df:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/OpenImageIO
 * [new ref]         635acc95eec06ef9feee403e1ac9fd1ba81f27df -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 635acc9 Exclude i686 as OpenVDB no longer builds on 32bit arches.