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#!/bin/bash
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#-------------------------------------------------------------------------------------------------
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#$Header$
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#-------------------------------------------------------------------------------------------------
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#This file is part of "Server Scripts, Automatic Maintenance, Cron", a set of scripts for
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#performing automatic periodic maintenance on a Linux server.
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#-------------------------------------------------------------------------------------------------
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#This source code and any program in which it is compiled/used is provided under the MIT License,
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#reproduced below.
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#-------------------------------------------------------------------------------------------------
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#Permission is hereby granted, free of charge, to any person obtaining a copy of
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#this software and associated documentation files(the "Software"), to deal in the
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#Software without restriction, including without limitation the rights to use,
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#copy, modify, merge, publish, distribute, sublicense, and / or sell copies of the
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#Software, and to permit persons to whom the Software is furnished to do so,
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#subject to the following conditions :
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#
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#The above copyright notice and this permission notice shall be included in all
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#copies or substantial portions of the Software.
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#
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#THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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#IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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#FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
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#AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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#LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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#OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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#SOFTWARE.
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#-------------------------------------------------------------------------------------------------
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#Powers off my Lenovo 11e server if the battery is too depleted. Designed to be run every 1-5
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#minutes. It has its own cron entry (in /etc/crontab) because there is no guarantee that the
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#Lenovo 11e built-in battery is robust enough to make it through the regular maintenance cron, so
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#can't safely put this logic in there. Between interrupting maintenance tasks and a hard power
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#fail, the interruption is less of a threat than a hard power fail.
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#----------------------------------------------------------------------------------------------------
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#Delay for 120 seconds if the power_fail_occurred lockfile exists, indicating that we are restarting
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#after a previous power fail. The reason for the delay is to guard against a missing battery or
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#a faulted battery -- if this occurs, it would be very hard to get the server running again without
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#rescue media. The 120 seconds gives time to rename this script or kill the cron process(es) or
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#something so the system can be started and will not power off.
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if [ -f /etc/cron.custom/lockfiles/power_failure_occurred ] ; then
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sleep 120
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rm /etc/cron.custom/lockfiles/power_failure_occurred
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fi
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#----------------------------------------------------------------------------------------------------
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#If the file with information doesn't exist, shutdown.
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if [ ! -f /sys/class/power_supply/BAT1/capacity ] ; then
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touch /etc/cron.custom/lockfiles/power_failure_occurred
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poweroff
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fi
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#----------------------------------------------------------------------------------------------------
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#If the file contains unfavorable information, shutdown.
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if [ `cat /sys/class/power_supply/BAT1/capacity` -lt 30 ] ; then
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touch /etc/cron.custom/lockfiles/power_failure_occurred
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poweroff
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fi
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#----------------------------------------------------------------------------------------------------
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