/usr/lib/python2.7/dist-packages/z3c.macro-1.4.2.egg-info/SOURCES.txt is in python-z3c.macro 1.4.2-0ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python2.7/dist-packages/z3c.macro-1.4.2.egg-info/../../../../share/pyshared/z3c.macro-1.4.2.egg-info/SOURCES.txt