$ git clone -n https://src.fedoraproject.org/rpms/nanopb.git /var/lib/mock/f40-build-795005-139924/root/chroot_tmpdir/scmroot/nanopb
Cloning into '/var/lib/mock/f40-build-795005-139924/root/chroot_tmpdir/scmroot/nanopb'...
$ git fetch origin 5d355e957e743b5d25f46be0f8e5ac66f9ee9394:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nanopb
 * [new ref]         5d355e957e743b5d25f46be0f8e5ac66f9ee9394 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5d355e9 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild