/usr/share/texmf-texlive/metapost/blockdraw_mp/docblockprefs.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 6 7 8 9 10 11 12 13 14 15 16 17 | numeric u;
u := 1cm;
numeric dashlw;
dashlw := 0.3pt;
picture gldash[];
gldash1 := dashpattern( on 0.25u off 0.25u );
gldash2 := dashpattern( on 0.5u off 0.1u on 0.1u off 0.1u on 0.1u off 0.1u );
longblockrx := 0.7u;
longblockry := 0.4u;
smallblockr := 0.3u;
connectionlw := 0.8pt;
textscale := 1;
shiftofflabelmargin := 2bboxmargin;
pickup pencircle scaled connectionlw;
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