File gdmflexiserver of Package lightdm

#!/bin/sh
#
# 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 for the full text of the license.

PATH=/usr/local/bin:/bin:/usr/bin
export PATH

if [ -z "$XDG_SEAT_PATH" ]; then
  # something went wrong
  exit 1
fi

find_command () {
    cmd="$1"
    oIFS="${IFS}"; IFS=:
    set -- ${PATH}
    IFS="${oIFS}"

    for part; do
        [ -x "${part}/${cmd}" ] && return 0
    done
    return 1
}

lock_screen () {
    for lock_cmd in \
        "xscreensaver-command -lock" \
        "gnome-screensaver-command --lock" \
        "dbus-send --session --dest=org.freedesktop.ScreenSaver --type=method_call /ScreenSaver org.freedesktop.ScreenSaver.Lock"
    do
        ${lock_cmd} >/dev/null 2>&1 && return
    done

    for lock_cmd in \
        "slock" \
        "xlock -mode blank"
    do
        set -- ${lock_cmd}
        if find_command "$1"; then
            ${lock_cmd} >/dev/null 2>&1 &
            return
        fi
    done
}

lock_screen

dbus-send --system --type=method_call --print-reply --dest=org.freedesktop.DisplayManager $XDG_SEAT_PATH org.freedesktop.DisplayManager.Seat.SwitchToGreeter