/usr/lib/python2.7/dist-packages/rdiff_backup/Hardlink.py is in rdiff-backup 1.2.8-7.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python2.7/dist-packages/rdiff_backup/../../../../share/pyshared/rdiff_backup/Hardlink.py