$ git clone -n https://src.fedoraproject.org/rpms/librdkafka.git /var/lib/mock/f31-build-59405-28580/root/thebuilddir/tmp/scmroot/librdkafka
Cloning into '/var/lib/mock/f31-build-59405-28580/root/thebuilddir/tmp/scmroot/librdkafka'...
$ git reset --hard 30c0caef08fea64dfc496cca98f97c24ced37b89
HEAD is now at 30c0cae - Rebuilt for https://fedoraproject.org/wiki/Fedora_30_Mass_Rebuild