/usr/share/texmf-texlive/metapost/base/mpost.mp is in texlive-metapost 2009-15.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | % $Id: mpost.mp,v 1.1 2005/05/06 09:11:09 taco Exp $
% Public domain.
input plain;
dump
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