This file is indexed.

/usr/share/xscreensaver/config/truchet.xml is in xscreensaver-data-extra 5.15-3ubuntu1.

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

The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="ISO-8859-1"?>

<screensaver name="truchet" _label="Truchet">

  <command arg="-root"/>

  <number id="delay" type="slider" arg="-delay %"
          _label="Frame rate" _low-label="Low" _high-label="High"
          low="0" high="1000000" default="400000"
          convert="invert"/>

  <!-- #### -min-width [40] -->
  <!-- #### -max-height [150] -->
  <!-- #### -max-width [150] -->
  <!-- #### -min-height [40] -->
  <!-- #### -max-linewidth [25] -->
  <!-- #### -min-linewidth [2] -->
  <!-- #### -no-erase -->
  <!-- #### -erase-count [25] -->
  <!-- #### -not-square -->
  <!-- #### -no-angles -->
  <!-- #### -no-curves -->
  <!-- #### -scroll -->
  <!-- #### -scroll-overlap [400] -->
  <!-- #### -anim-delay [100] -->
  <!-- #### -anim-step-size [3] -->

  <boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>

  <_description>
This draws line- and arc-based truchet patterns that tile the screen.

http://en.wikipedia.org/wiki/Tessellation

Written by Adrian Likins; 1998.
  </_description>
</screensaver>