$ git clone -n https://src.fedoraproject.org/rpms/lmdb.git /var/lib/mock/f45-build-17521-501/root/chroot_tmpdir/scmroot/lmdb
Cloning into '/var/lib/mock/f45-build-17521-501/root/chroot_tmpdir/scmroot/lmdb'...
$ git fetch origin 3904fb372f44f924ad30c5baf80344928ee68c6c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/lmdb
 * [new ref]         3904fb372f44f924ad30c5baf80344928ee68c6c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3904fb3 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild