How to implement Linux automatic shutdown when the battery is low

Preface

The electricity in my residence has been unstable recently, and there are frequent sudden power outages. Although I have a laptop, it may not be able to receive power. If this continues, the SSD in the laptop will soon fail.

So I wrote a simple script that shuts down the computer when the battery is low, and then uses crontab or systemd timers to check it regularly.

For information on how to use the crontab command, please refer to: https://www.jb51.net/article/148575.htm

Let’s take a look at the detailed introduction.

check_shutdown.timer:

$ cat /etc/systemd/system/check_shutdown.timer 
[Unit]
Description=Check if battery is low every 10 minutes

[Timer]
OnCalendar=*:0/10
Persistent=true

[Install]
WantedBy=timers.target

check_shutdown.service:

$ cat /etc/systemd/system/check_shutdown.service 
[Service]
ExecStart=
ExecStart=/home/jiajun/.xmonad/scripts/shutdown.py

check_shutdown.py:

#!/home/jiajun/.py3k/bin/python

import psutil
import logging
import os
import datetime

bat = psutil.sensors_battery()
logging.warn("%s: battery status: %s", datetime.datetime.now(), bat)

if bat.percent < 15:
logging.warn("gonna shutdown")
os.system("sudo shutdown -h now")

Summarize

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