git-repo/hooks/pre-auto-gc

#!/bin/sh
#
# An example hook script to verify if you are on battery, in case you
# are running Windows, Linux or OS X. Called by git-gc --auto with no
# arguments. The hook should exit with non-zero status after issuing an
# appropriate message if it wants to stop the auto repacking.

# 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 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 uname -s | grep -q "_NT-"
then
	if test -x $SYSTEMROOT/System32/Wbem/wmic
	then
		STATUS=$(wmic path win32_battery get batterystatus /format:list | tr -d '\r\n')
		[ "$STATUS" = "BatteryStatus=2" ] && exit 0 || exit 1
	fi
	exit 0
fi

if test -x /sbin/on_ac_power && /sbin/on_ac_power
then
	exit 0
elif test "$(cat /sys/class/power_supply/AC/online 2>/dev/null)" = 1
then
	exit 0
elif grep -q 'on-line' /proc/acpi/ac_adapter/AC/state 2>/dev/null
then
	exit 0
elif grep -q '0x01$' /proc/apm 2>/dev/null
then
	exit 0
elif grep -q "AC Power \+: 1" /proc/pmu/info 2>/dev/null
then
	exit 0
elif test -x /usr/bin/pmset && /usr/bin/pmset -g batt |
	grep -q "drawing from 'AC Power'"
then
	exit 0
elif test -d /sys/bus/acpi/drivers/battery && test 0 = \
  "$(find /sys/bus/acpi/drivers/battery/ -type l | wc -l)";
then
	# No battery exists.
	exit 0
fi

echo "Auto packing deferred; not on AC"
exit 1