$ git clone -n https://src.fedoraproject.org/rpms/flatbuffers.git /var/lib/mock/f45-build-9040-398/root/chroot_tmpdir/scmroot/flatbuffers
Cloning into '/var/lib/mock/f45-build-9040-398/root/chroot_tmpdir/scmroot/flatbuffers'...
$ git fetch origin 85377e7d54e165470c9ef4373bd9d90376b6140e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/flatbuffers
 * [new ref]         85377e7d54e165470c9ef4373bd9d90376b6140e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 85377e7 Simplify setting Boolean CMake options based on build conditionals