$ git clone -n https://src.fedoraproject.org/rpms/flatbuffers.git /var/lib/mock/f40-build-735304-106334/root/chroot_tmpdir/scmroot/flatbuffers
Cloning into '/var/lib/mock/f40-build-735304-106334/root/chroot_tmpdir/scmroot/flatbuffers'...
$ git fetch origin 2208d6c3ba0dbcc2992b43761c5e4827cc6f21e1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/flatbuffers
 * [new ref]         2208d6c3ba0dbcc2992b43761c5e4827cc6f21e1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2208d6c F38+: Run the tests with %{py3_test_envvars}