$ git clone -n https://src.fedoraproject.org/rpms/nanopb.git /var/lib/mock/f41-build-side-2-python-2708481-30473/root/chroot_tmpdir/scmroot/nanopb
Cloning into '/var/lib/mock/f41-build-side-2-python-2708481-30473/root/chroot_tmpdir/scmroot/nanopb'...
$ git fetch origin d3604b90d871c700bb6f33256333ca3c398ef82e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nanopb
 * [new ref]         d3604b90d871c700bb6f33256333ca3c398ef82e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d3604b9 Update to 0.4.9 upstream release