/usr/lib/python2.6/dist-packages/pysnmp-4.2.2.egg-info/SOURCES.txt is in python-pysnmp4 4.2.2-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python2.6/dist-packages/pysnmp-4.2.2.egg-info/../../../../share/pyshared/pysnmp-4.2.2.egg-info/SOURCES.txt