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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
#
# If we do not have any power supplies, assume we are on AC
ret=0
# Iterate through power supplies sysfs knows about.
for ps in /sys/class/power_supply/*; do
[ -r "$ps/online" ] || continue
# OK, we know we have an AC adaptor.
# Our default return changes to failed.
ret=1
read -r ps_status < "$ps/online"
[ 1 -eq "$ps_status" ] && exit 0
done
exit "$ret"