diff options
| -rw-r--r-- | scripts/critical_hibernate.py | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/scripts/critical_hibernate.py b/scripts/critical_hibernate.py new file mode 100644 index 0000000..7b19978 --- /dev/null +++ b/scripts/critical_hibernate.py @@ -0,0 +1,65 @@ +#!/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' % sysfs_path) + 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') |