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Filename : e2scrub_all_cron
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#!/bin/bash

#  Copyright (C) 2018 Oracle.  All Rights Reserved.
#
#  Author: Darrick J. Wong <darrick.wong@oracle.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; either version 2
#  of the License, or (at your option) any later version.
#
#  This program is distributed in the hope that it would 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 the Free Software Foundation,
#  Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA.

# Run e2scrub_all from a cronjob if we don't have systemd and we're not
# running on AC power.

on_ac_power() {
	local any_known=no

	# try sysfs power class first
	if [ -d /sys/class/power_supply ]; then
		for psu in /sys/class/power_supply/*; do
			if [ -r "$psu/type" ]; then
				type=$(cat "$psu/type")

				# ignore batteries
				[ "$type" = "Battery" ] && continue

				online=$(cat "$psu/online")

				[ "$online" = 1 ] && return 0
				[ "$online" = 0 ] && any_known=yes
			fi
		done

		[ "$any_known" = "yes" ] && return 1
	fi

	# else fall back to AC adapters in /proc
	if [ -d /proc/acpi/ac_adapter ]; then
		for ac in /proc/acpi/ac_adapter/*; do
			if [ -r "$ac/state" ]; then
				grep -q on-line "$ac/state" && return 0
				grep -q off-line "$ac/state" && any_known=yes
			elif [ -r "$ac/status" ]; then
				grep -q on-line "$ac/status" && return 0
				grep -q off-line "$ac/status" && any_known=yes
			fi
		done

		[ "$any_known" = "yes" ] && return 1
	fi

	# Can't tell, just assume we're on AC.
	return 0
}

test -e /sbin/e2scrub_all || exit 0
test -e /run/systemd/system && exit 0
on_ac_power || exit 0

exec /sbin/e2scrub_all