$ git clone -n https://src.fedoraproject.org/rpms/perl-Cassandra-Client.git /var/lib/mock/f45-build-22188-590/root/chroot_tmpdir/scmroot/perl-Cassandra-Client
Cloning into '/var/lib/mock/f45-build-22188-590/root/chroot_tmpdir/scmroot/perl-Cassandra-Client'...
$ git fetch origin 48edb5f1c69d954d2c0efe3d201b7cd1705c9644:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Cassandra-Client
 * [new ref]         48edb5f1c69d954d2c0efe3d201b7cd1705c9644 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 48edb5f Perl 5.44 rebuild