/usr/share/texlive/texmf-dist/metapost/config/mfplain.ini is in texlive-metapost 2014.20141024-2+deb8u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | % Karl Berry, 1998. public domain.
\input mfplain
\dump
\endinput
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