/etc/texmf/tex/latex/config/graphics.cfg is in texlive-latex-base 2009-15.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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% Written by Thomas Esser, Heiko Oberdiek, Sebastian Rahtz, and others.
\ProvidesFile{graphics.cfg}%
[2009/08/28 v1.8 graphics configuration of TeX Live]%
% Select an appropriate default driver
\begingroup
\chardef\x=0\relax
% check pdfTeX
\@ifundefined{pdfoutput}{}{%
\ifnum\pdfoutput<1 %
\else
\chardef\x=1\relax
\fi
}%
% check VTeX
\@ifundefined{OpMode}{}{%
\chardef\x=2\relax
}%
% check XeTeX
\@ifundefined{XeTeXversion}{}{%
\chardef\x=3\relax
}%
\expandafter\endgroup
\ifcase\x
% default case
\def\Gin@driver{dvips.def}%
\ExecuteOptions{dvips}%
\or
% pdfTeX is running in pdf mode
\def\Gin@driver{pdftex.def}%
\ExecuteOptions{pdftex}%
% The below is inoperative for the TL'09 DVD; we could not secure all
% the necessary components before the release.
%
% Load package epstopdf if
% a) LaTeX is running (plain TeX users are on their own),
% b) and shell escape (\write18) is enabled (possibly restricted),
% c) and \DoNotLoadEpstopdf either does not exist or is not \relax.
%
% In other words, by default .eps files will be automatically
% converted to .pdf files when outputting pdf. This can be wrong!
% If you created the .pdf as the source of a graphic, and derived a
% .eps from it, you should put
% \newcommand{\DoNotLoadEpstopdf}{}
% before even the \documentclass line of your document.
%
% More information about the epstopdf run will be in the .log file;
% see http://ctan.org/pkg/epstopdf-pkg for more info about the
% epstopdf package itself. In turn, it calls the epstopdf script
% (http://ctan.org/pkg/epstopdf).
%
% For the first discussion and background on this, see the thread on latex-l:
% http://thread.gmane.org/gmane.comp.tex.latex.latex3/1465
%
% \begingroup\expandafter\expandafter\expandafter\endgroup
% \expandafter\ifx\csname DoNotLoadEpstopdf\endcsname\relax
% \begingroup\expandafter\expandafter\expandafter\endgroup
% \expandafter\ifx\csname AtEndOfPackage\endcsname\relax
% \else
% \AtEndOfPackage{%
% \RequirePackage{pdftexcmds}[2007/11/11]%
% \expandafter\ifx\csname pdf@shellescape\endcsname\relax
% \else
% \ifnum\pdf@shellescape>0 %
% \RequirePackage{epstopdf-base}[2009/07/12]%
% \fi
% \fi
% }%
% \fi
% \fi
\or
% VTeX is running
\def\Gin@driver{vtex.def}%
\ExecuteOptions{vtex}%
\else
% XeTeX is running
\def\Gin@driver{xetex.def}%
\ExecuteOptions{xetex}%
\fi
% Fix for dvips and xdvi versions that can uncompress
% graphic files without an explicite call of gunzip.
% (The fix is not applied for miniltx.tex, because
% \AtEndOfPackage is not available in plainTeX.)
\begingroup\expandafter\expandafter\expandafter\endgroup
\expandafter\ifx\csname AtEndOfPackage\endcsname\relax
\else
\AtEndOfPackage{%
\begingroup
\@ifundefined{DeclareGraphicsRule}{%
\endgroup
}{%
\def\x{dvips.def}%
\expandafter\endgroup
\ifx\x\Gin@driver
\DeclareGraphicsRule{.pz}{eps}{.bb}{}%
\DeclareGraphicsRule{.eps.Z}{eps}{.eps.bb}{}%
\DeclareGraphicsRule{.ps.Z}{eps}{.ps.bb}{}%
\DeclareGraphicsRule{.ps.gz}{eps}{.ps.bb}{}%
\DeclareGraphicsRule{.eps.gz}{eps}{.eps.bb}{}%
\fi
}%
}%
\fi
\endinput
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