$ git clone -n https://src.fedoraproject.org/rpms/lmdbxx.git /var/lib/mock/f45-build-17559-501/root/chroot_tmpdir/scmroot/lmdbxx
Cloning into '/var/lib/mock/f45-build-17559-501/root/chroot_tmpdir/scmroot/lmdbxx'...
$ git fetch origin fe19366e7be4d67d0c94b1f10ba394edbe04f929:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/lmdbxx
 * [new ref]         fe19366e7be4d67d0c94b1f10ba394edbe04f929 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fe19366 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild