This file is indexed.

/usr/share/lilypond/2.14.2/fonts/source/feta-noteheads-generic.mf is in lilypond-data 2.14.2-4.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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% Feta (not the Font-En-Tja) music font --  generic stuff: include lots of files, but don't
% This file is part of LilyPond, the GNU music typesetter.
%
% Copyright (C) 1997--2011 Han-Wen Nienhuys <hanwen@xs4all.nl>
%
%
% LilyPond is free software: you can redistribute it and/or modify
% it under the terms of the GNU General Public License as published by
% the Free Software Foundation, either version 3 of the License, or
% (at your option) any later version.
%
% LilyPond is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	See the
% GNU General Public License for more details.
%
% You should have received a copy of the GNU General Public License
% along with LilyPond.	If not, see <http://www.gnu.org/licenses/>.


if test = -1:
	mode := smoke;
fi

staffsize# := design_size * pt#;

mode_setup;

input feta-macros;

input feta-params;

font_x_height staff_space#;

%% this is a fallback so we can run the font without
%%    including feta-noteheads.
black_notehead_width# := 1.0 staff_space#;


fet_beginfont ("feta", design_size, "fetaMusic");

if test = 0:
	input feta-noteheads;
        input feta-flags;
else:
	input feta-noteheads-test-generic.mf;
fi

autometric_parameter ("staffsize", staffsize#);
autometric_parameter ("stafflinethickness", stafflinethickness#);
autometric_parameter ("staff_space", staff_space#);
autometric_parameter ("linethickness", linethickness#);
autometric_parameter ("black_notehead_width", black_notehead_width#);
autometric_parameter ("ledgerlinethickness", ledgerlinethickness#);
autometric_parameter ("blot_diameter", blot_diameter#);

fet_endfont;