$ git clone -n https://src.fedoraproject.org/rpms/OpenImageIO.git /var/lib/mock/f41-build-side-1-2887759-34541/root/chroot_tmpdir/scmroot/OpenImageIO
Cloning into '/var/lib/mock/f41-build-side-1-2887759-34541/root/chroot_tmpdir/scmroot/OpenImageIO'...
$ git fetch origin 35a9475ff0f5a7c2cfc620be7135e69f562069d9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/OpenImageIO
 * [new ref]         35a9475ff0f5a7c2cfc620be7135e69f562069d9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 35a9475 Update specfile incluidng build requirements that are now in Fedora.