$ git clone -n https://src.fedoraproject.org/rpms/opensubdiv.git /var/lib/mock/f42-build-side-1-3588730-46949/root/chroot_tmpdir/scmroot/opensubdiv
Cloning into '/var/lib/mock/f42-build-side-1-3588730-46949/root/chroot_tmpdir/scmroot/opensubdiv'...
$ git fetch origin cfd6d15e06532061115bdde9f212ebbb7af32b70:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/opensubdiv
 * [new ref]         cfd6d15e06532061115bdde9f212ebbb7af32b70 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cfd6d15 Rebuild for the latest tbb