/usr/lib/lightdm/lightdm-greeter-session is in lightdm 1.10.0-0ubuntu3.
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 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 | #!/bin/sh
# -*- Mode: sh; indent-tabs-mode: nil; tab-width: 4 -*-
#
# Copyright (C) 2011 Canonical Ltd
# Author: Michael Terry <michael.terry@canonical.com>
#
# This program 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, version 3 of the License.
#
# See http://www.gnu.org/copyleft/gpl.html the full text of the license.
# This wrapper merely ensures that dbus-daemon lives only as long as this
# script does. Otherwise, it's very easy for dbus-daemon to be autolaunched
# and detached from the greeter.
trap cleanup TERM EXIT
cleanup()
{
trap - TERM EXIT
if [ -n "$DBUS_SESSION_BUS_PID" ]; then
kill "$DBUS_SESSION_BUS_PID"
fi
if [ -n "$CMD_PID" ]; then
kill "$CMD_PID"
fi
exit 0
}
eval `dbus-launch --sh-syntax`
exec $@ &
CMD_PID=$!
wait $CMD_PID
CMD_PID=
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