/usr/share/sandbox/sandboxX.sh is in policycoreutils 2.1.0-3ubuntu1.
This file is owned by root:root, with mode 0o755.
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 | #!/bin/bash
context=`id -Z | secon -t -l -P`
export TITLE="Sandbox $context -- `grep ^#TITLE: ~/.sandboxrc | /usr/bin/cut -b8-80`"
export SCREENSIZE="1000x700"
#export SCREENSIZE=`xdpyinfo | awk '/dimensions/ { print $2 }'`
trap "exit 0" HUP
(/usr/bin/Xephyr -title "$TITLE" -terminate -screen $SCREENSIZE -displayfd 5 5>&1 2>/dev/null) | while read D; do
export DISPLAY=:$D
python -c 'import gtk, os, commands; commands.getstatusoutput("%s/.sandboxrc" % os.environ["HOME"])'
export EXITCODE=$?
kill -HUP 0
break
done
exit 0
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