93 lines
2.6 KiB
Python
93 lines
2.6 KiB
Python
# Copyright 2018 Red Hat, Inc.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import subprocess
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import tenacity
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from paunch.utils import common
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class SystemctlException(Exception):
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pass
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def systemctl(cmd, log=None):
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log = log or common.configure_logging(__name__)
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if not isinstance(cmd, list):
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raise SystemctlException("systemctl cmd passed must be a list")
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cmd.insert(0, 'systemctl')
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log.debug("Executing: {}".format(" ".join(cmd)))
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try:
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subprocess.check_call(cmd)
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except subprocess.CalledProcessError as err:
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raise SystemctlException(str(err))
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def format_name(name):
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return name if name.endswith('.service') else name + ".service"
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def stop(service, log=None):
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systemctl(['stop', service], log)
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def daemon_reload(log=None):
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systemctl(['daemon-reload'], log)
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def reset_failed(service, log=None):
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systemctl(['reset-failed', service], log)
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def is_active(service, log=None):
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systemctl(['is-active', '-q', service], log)
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# NOTE(bogdando): this implements a crash-loop with reset-failed
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# counters approach that provides an efficient feature parity to the
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# classic rate limiting, shall we want to implement that for the
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# systemctl command wrapper instead.
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@tenacity.retry( # Retry up to 5 times with jittered exponential backoff
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reraise=True,
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retry=tenacity.retry_if_exception_type(
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SystemctlException
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),
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wait=tenacity.wait_random_exponential(multiplier=1, max=10),
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stop=tenacity.stop_after_attempt(5)
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)
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def enable(service, now=True, log=None):
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cmd = ['enable']
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if now:
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cmd.append('--now')
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cmd.append(service)
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try:
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systemctl(cmd, log)
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except SystemctlException as err:
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# Reset failure counters for the service unit and retry
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reset_failed(service, log)
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raise SystemctlException(str(err))
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def disable(service, log=None):
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systemctl(['disable', service], log)
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def add_requires(target, units, log=None):
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cmd = ['add-requires', target]
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if isinstance(units, list):
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cmd.extend(units)
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else:
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cmd.append(units)
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systemctl(cmd, log)
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