$ git clone -n https://src.fedoraproject.org/rpms/perl-DBD-Cassandra.git /var/lib/mock/f45-build-22683-593/root/chroot_tmpdir/scmroot/perl-DBD-Cassandra
Cloning into '/var/lib/mock/f45-build-22683-593/root/chroot_tmpdir/scmroot/perl-DBD-Cassandra'...
$ git fetch origin dcc5efe6685d93e5a80d46f0896c2af1730d757c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-DBD-Cassandra
 * [new ref]         dcc5efe6685d93e5a80d46f0896c2af1730d757c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dcc5efe Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild