$ git clone -n https://src.fedoraproject.org/rpms/libzdb.git /var/lib/mock/f45-build-17343-498/root/chroot_tmpdir/scmroot/libzdb
Cloning into '/var/lib/mock/f45-build-17343-498/root/chroot_tmpdir/scmroot/libzdb'...
$ git fetch origin b0d211bcec7603ceafad7c749d359689f7ed0141:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libzdb
 * [new ref]         b0d211bcec7603ceafad7c749d359689f7ed0141 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b0d211b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild