/usr/lib/rpm/fileattrs/psdriver.attr is in python-cups 1.9.61-0ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | %__psdriver_provides %{_rpmconfigdir}/postscriptdriver.prov
%__psdriver_path ^(/usr/lib/cups/driver/.*|%{_datadir}/cups/drv/.*\.drv)$
%__psdriver_magic ^PPD file.*$
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