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#!/usr/bin/python3
import os
import subprocess
import sys
import time
# For use with systemd as a service:
# copy this script to /usr/local/sbin/critical_hibernate.py with:
# install -m 0755 -o root -g root critical_hibernate.py
# /usr/local/sbin/critical_hibernate.py
# and:
# /etc/systemd/system/critical_hibernate.service
#
# [Service]
# ExecStart=/usr/local/sbin/critical_hibernate.py
# Restart=on-failure
# KillMode=process
#
# [Install]
# WantedBy=multi-user.target
#
# Then, do a systemctl enable --now critical_hibernate
sysfs_path = '/sys/class/power_supply/BAT0/uevent'
threshold = 9
run_hibernate = True
original_print = print
def flush_print(*args, **kw):
original_print(*args, **kw)
filelike = kw.get('file', sys.stdout)
filelike.flush()
print = flush_print
try:
while True:
batfd = None
try:
batfd = os.open(sysfs_path, os.O_RDONLY)
print('monitoring %s (threshold %d%%)' % (sysfs_path, threshold))
while True:
uevent_dict = dict((e.split(b'=')
for e in os.pread(batfd, 1024, 0).split()))
capacity = int(uevent_dict[b'POWER_SUPPLY_CAPACITY'])
status = uevent_dict[b'POWER_SUPPLY_STATUS']
if status == b'Discharging' and capacity <= threshold:
print('low battery %d <= %d' % (capacity, threshold))
if run_hibernate:
print('running systemctl hibernate')
subprocess.run(['/bin/systemctl', 'hibernate'])
time.sleep(60)
except OSError:
print('io error on %s, assume battery changement' % sysfs_path)
except FileNotFoundError:
print('file %s is missing' % sysfs_path)
finally:
if batfd is not None:
os.close(batfd)
print('retrying to open %s in 60 seconds' % sysfs_path)
time.sleep(60)
except KeyboardInterrupt:
print('SIGINT, exiting')
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