borgmatic/borgmatic/signals.py

35 lines
1.0 KiB
Python

import logging
import os
import signal
import sys
logger = logging.getLogger(__name__)
EXIT_CODE_FROM_SIGNAL = 128
def handle_signal(signal_number, frame):
'''
Send the signal to all processes in borgmatic's process group, which includes child processes.
'''
# Prevent infinite signal handler recursion. If the parent frame is this very same handler
# function, we know we're recursing.
if frame.f_back.f_code.co_name == handle_signal.__name__:
return
os.killpg(os.getpgrp(), signal_number)
if signal_number == signal.SIGTERM:
logger.critical('Exiting due to TERM signal')
sys.exit(EXIT_CODE_FROM_SIGNAL + signal.SIGTERM)
def configure_signals():
'''
Configure borgmatic's signal handlers to pass relevant signals through to any child processes
like Borg. Note that SIGINT gets passed through even without these changes.
'''
for signal_number in (signal.SIGHUP, signal.SIGTERM, signal.SIGUSR1, signal.SIGUSR2):
signal.signal(signal_number, handle_signal)