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79 lines
2.9 KiB
79 lines
2.9 KiB
# Copyright 2016 The Chromium OS Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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from __future__ import print_function
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import logging, re
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# http://docs.python.org/2/library/errno.html
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import errno
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from autotest_lib.client.common_lib import error
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class WatchdogTester(object):
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"""Helper class to perform various watchdog tests."""
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WD_DEV = '/dev/watchdog'
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DAISYDOG_PATH='/usr/sbin/daisydog'
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def _exists_on_client(self):
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return self._client.run('test -c "%s"' % self.WD_DEV,
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ignore_status=True).exit_status == 0 and \
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self._client.run('test -x "%s"' % self.DAISYDOG_PATH,
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ignore_status=True).exit_status == 0
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# If daisydog is running, stop it so we can use /dev/watchdog
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def _stop_daemon(self):
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"""If running, stop daisydog so we can use /dev/watchdog."""
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self._client.run('stop daisydog', ignore_status=True)
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def _start_daemon(self):
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self._client.run('start daisydog', ignore_status=True)
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def _query_hw_interval(self):
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"""Check how long the hardware interval is."""
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output = self._client.run('daisydog -c').stdout
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secs = re.findall(r'HW watchdog interval is (\d*) seconds', output)[0]
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return int(secs)
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def __init__(self, client):
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self._client = client
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self._supported = self._exists_on_client()
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def is_supported(self):
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return self._supported
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def __enter__(self):
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self._stop_daemon()
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self._hw_interval = self._query_hw_interval()
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def trigger_watchdog(self, timeout=60):
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"""
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Trigger a watchdog reset by opening the watchdog device but not petting
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it. Will ensure the device goes down and comes back up again.
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"""
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try:
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self._client.run('echo "z" > %s' % self.WD_DEV)
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except error.AutoservRunError as e:
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raise error.TestError('write to %s failed (%s)' %
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(self.WD_DEV, errno.errorcode[e.errno]))
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logging.info("WatchdogHelper: tickled watchdog on %s (%ds to reboot)",
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self._client.hostname, self._hw_interval)
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# machine should became unpingable after lockup
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# ...give 5 seconds slack...
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wait_down = self._hw_interval + 5
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if not self._client.wait_down(timeout=wait_down):
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raise error.TestError('machine should be unpingable '
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'within %d seconds' % wait_down)
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# make sure the machine comes back,
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# DHCP can take up to 45 seconds in odd cases.
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if not self._client.wait_up(timeout=timeout):
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raise error.TestError('machine did not reboot/ping within '
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'%d seconds of HW reset' % timeout)
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def __exit__(self, exception, value, traceback):
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self._start_daemon()
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