Fix handling of TERM signal to exit borgmatic, not just forward the signal to Borg (#516).

This commit is contained in:
Dan Helfman 2022-04-03 13:12:48 -07:00
parent 9f44bbad65
commit 0c027a3050
3 changed files with 56 additions and 4 deletions

1
NEWS
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@ -1,4 +1,5 @@
1.5.25.dev0
* #516: Fix handling of TERM signal to exit borgmatic, not just forward the signal to Borg.
* #517: Fix borgmatic exit code (so it's zero) when initial Borg calls fail but later retries
succeed.

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import logging
import os
import signal
import sys
logger = logging.getLogger(__name__)
def _handle_signal(signal_number, frame): # pragma: no cover
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__:
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(): # pragma: no cover
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)
signal.signal(signal_number, handle_signal)

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from flexmock import flexmock
from borgmatic import signals as module
def test_handle_signal_forwards_to_subprocesses():
signal_number = 100
frame = flexmock(f_back=flexmock(f_code=flexmock(co_name='something')))
process_group = flexmock()
flexmock(module.os).should_receive('getpgrp').and_return(process_group)
flexmock(module.os).should_receive('killpg').with_args(process_group, signal_number).once()
module.handle_signal(signal_number, frame)
def test_handle_signal_bails_on_recursion():
signal_number = 100
frame = flexmock(f_back=flexmock(f_code=flexmock(co_name='handle_signal')))
flexmock(module.os).should_receive('getpgrp').never()
flexmock(module.os).should_receive('killpg').never()
module.handle_signal(signal_number, frame)
def test_handle_signal_exits_on_sigterm():
signal_number = module.signal.SIGTERM
frame = flexmock(f_back=flexmock(f_code=flexmock(co_name='something')))
flexmock(module.os).should_receive('getpgrp').and_return(flexmock)
flexmock(module.os).should_receive('killpg')
flexmock(module.sys).should_receive('exit').with_args(
module.EXIT_CODE_FROM_SIGNAL + signal_number
).once()
module.handle_signal(signal_number, frame)
def test_configure_signals_installs_signal_handlers():
flexmock(module.signal).should_receive('signal').at_least().once()
module.configure_signals()