$ git clone -n https://src.fedoraproject.org/rpms/openvdb.git /var/lib/mock/f40-build-2265627-54616/root/chroot_tmpdir/scmroot/openvdb
Cloning into '/var/lib/mock/f40-build-2265627-54616/root/chroot_tmpdir/scmroot/openvdb'...
$ git fetch origin 0b14cc2cb9c02560db65d2850866588e8a3df5cd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/openvdb
 * [new ref]         0b14cc2cb9c02560db65d2850866588e8a3df5cd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0b14cc2 Rebuilt for Boost 1.83