$ git clone -n https://src.fedoraproject.org/rpms/openvdb.git /var/lib/mock/f40-build-2212371-52263/root/chroot_tmpdir/scmroot/openvdb
Cloning into '/var/lib/mock/f40-build-2212371-52263/root/chroot_tmpdir/scmroot/openvdb'...
$ git fetch origin dbb87837413d84dc8590d20f2dc9bc7f85406ef6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/openvdb
 * [new ref]         dbb87837413d84dc8590d20f2dc9bc7f85406ef6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dbb8783 Update to 11.0.0 (rhbz#2243424)