$ git clone -n https://src.fedoraproject.org/rpms/librdkafka.git /var/lib/mock/f45-build-16841-491/root/chroot_tmpdir/scmroot/librdkafka
Cloning into '/var/lib/mock/f45-build-16841-491/root/chroot_tmpdir/scmroot/librdkafka'...
$ git fetch origin afa386b23dad59b3aa90717cd700abb8e473fb75:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/librdkafka
 * [new ref]         afa386b23dad59b3aa90717cd700abb8e473fb75 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at afa386b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild