Fix handling of TERM signal to exit borgmatic, not just forward the signal to Borg (#516).
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3 changed files with 56 additions and 4 deletions
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NEWS
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NEWS
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1.5.25.dev0
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* #516: Fix handling of TERM signal to exit borgmatic, not just forward the signal to Borg.
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* #517: Fix borgmatic exit code (so it's zero) when initial Borg calls fail but later retries
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succeed.
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import logging
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import os
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import signal
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import sys
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logger = logging.getLogger(__name__)
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def _handle_signal(signal_number, frame): # pragma: no cover
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EXIT_CODE_FROM_SIGNAL = 128
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def handle_signal(signal_number, frame):
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'''
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Send the signal to all processes in borgmatic's process group, which includes child processes.
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'''
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# Prevent infinite signal handler recursion. If the parent frame is this very same handler
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# function, we know we're recursing.
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if frame.f_back.f_code.co_name == _handle_signal.__name__:
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if frame.f_back.f_code.co_name == handle_signal.__name__:
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return
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os.killpg(os.getpgrp(), signal_number)
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if signal_number == signal.SIGTERM:
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logger.critical('Exiting due to TERM signal')
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sys.exit(EXIT_CODE_FROM_SIGNAL + signal.SIGTERM)
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def configure_signals(): # pragma: no cover
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def configure_signals():
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'''
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Configure borgmatic's signal handlers to pass relevant signals through to any child processes
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like Borg. Note that SIGINT gets passed through even without these changes.
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'''
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for signal_number in (signal.SIGHUP, signal.SIGTERM, signal.SIGUSR1, signal.SIGUSR2):
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signal.signal(signal_number, _handle_signal)
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signal.signal(signal_number, handle_signal)
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40
tests/unit/test_signals.py
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40
tests/unit/test_signals.py
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from flexmock import flexmock
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from borgmatic import signals as module
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def test_handle_signal_forwards_to_subprocesses():
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signal_number = 100
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frame = flexmock(f_back=flexmock(f_code=flexmock(co_name='something')))
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process_group = flexmock()
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flexmock(module.os).should_receive('getpgrp').and_return(process_group)
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flexmock(module.os).should_receive('killpg').with_args(process_group, signal_number).once()
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module.handle_signal(signal_number, frame)
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def test_handle_signal_bails_on_recursion():
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signal_number = 100
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frame = flexmock(f_back=flexmock(f_code=flexmock(co_name='handle_signal')))
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flexmock(module.os).should_receive('getpgrp').never()
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flexmock(module.os).should_receive('killpg').never()
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module.handle_signal(signal_number, frame)
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def test_handle_signal_exits_on_sigterm():
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signal_number = module.signal.SIGTERM
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frame = flexmock(f_back=flexmock(f_code=flexmock(co_name='something')))
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flexmock(module.os).should_receive('getpgrp').and_return(flexmock)
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flexmock(module.os).should_receive('killpg')
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flexmock(module.sys).should_receive('exit').with_args(
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module.EXIT_CODE_FROM_SIGNAL + signal_number
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).once()
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module.handle_signal(signal_number, frame)
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def test_configure_signals_installs_signal_handlers():
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flexmock(module.signal).should_receive('signal').at_least().once()
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module.configure_signals()
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