$ git clone -n https://src.fedoraproject.org/rpms/OpenColorIO.git /var/lib/mock/f40-build-2358625-60310/root/chroot_tmpdir/scmroot/OpenColorIO
Cloning into '/var/lib/mock/f40-build-2358625-60310/root/chroot_tmpdir/scmroot/OpenColorIO'...
$ git fetch origin 03f8fef41b6c7f2799b0382dba67ce7e8b219713:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/OpenColorIO
 * [new ref]         03f8fef41b6c7f2799b0382dba67ce7e8b219713 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 03f8fef i686 is now excluded in OpenImageIO and OpenVDB.