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#!/bin/sh
#
# Test if the computer is running on line power
# Exit status:
# - 0 (true)  System is on AC power
# - 1 (false) System is not on AC power
#
# NOTE: Batteries are not good indicators unless we also check their type,
#       as some peripherals have batteries.
#
# Copyright 2006 Red Hat, Inc.
# Copyright 2006 Richard Hughes
#
# Based on work from:
#    Richard Hughes <hughsient@gmail.com>
#    Peter Jones <pjones@redhat.com>
#    Stefan Seyfried <seife@suse.de>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of version 2 of the GNU General Public License as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#

# prefer UPower if available
if s="$(dbus-send --system --print-reply \
    --dest=org.freedesktop.UPower \
    /org/freedesktop/UPower \
    org.freedesktop.DBus.Properties.Get \
    string:org.freedesktop.UPower string:OnBattery)"; then
    echo "$s" | grep -q 'boolean false'
    exit $?
fi

# try its old name 'DeviceKit-power' too
if s="$(dbus-send --system --print-reply \
    --dest=org.freedesktop.DeviceKit.Power \
    /org/freedesktop/DeviceKit/Power \
    org.freedesktop.DBus.Properties.Get \
    string:org.freedesktop.DeviceKit.Power string:OnBattery)"; then
    echo "$s" | grep -q 'boolean false'
    exit $?
fi

# Check for AC/DC/etc adapters
ac_adapters="$(hal-find-by-capability --capability ac_adapter)"

# If there are no AC adapters, it is most likely a desktop.
# Assume online, since we have no data.
[ -z "$ac_adapters" ] && exit 0

# If any of them are online, then we're done.
for device in $ac_adapters ; do
	present="$(hal-get-property --udi "$device" --key ac_adapter.present)"
	[ "$present" = "true" ] && exit 0
done

# If there are adapters, but none are online, we're not on AC.
exit 1