blob: ec254187d9d4e6c02138a7663e235710b04c6db3 [file] [log] [blame]
# Copyright 2016 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
import logging, re
import errno
from autotest_lib.client.common_lib import error
class WatchdogTester(object):
"""Helper class to perform various watchdog tests."""
WD_DEV = '/dev/watchdog'
def _exists_on_client(self):
return'test -c "%s"' % self.WD_DEV,
ignore_status=True).exit_status == 0
# If daisydog is running, stop it so we can use /dev/watchdog
def _stop_daemon(self):
"""If running, stop daisydog so we can use /dev/watchdog."""'stop daisydog', ignore_status=True)
def _start_daemon(self):'start daisydog', ignore_status=True)
def _query_hw_interval(self):
"""Check how long the hardware interval is."""
output ='daisydog -c').stdout
secs = re.findall(r'HW watchdog interval is (\d*) seconds', output)[0]
return int(secs)
def __init__(self, client):
self._client = client
self._supported = self._exists_on_client()
def is_supported(self):
return self._supported
def __enter__(self):
self._hw_interval = self._query_hw_interval()
def trigger_watchdog(self, timeout=60):
Trigger a watchdog reset by opening the watchdog device but not petting
it. Will ensure the device goes down and comes back up again.
try:'echo "z" > %s' % self.WD_DEV)
except error.AutoservRunError, e:
raise error.TestError('write to %s failed (%s)' %
(self.WD_DEV, errno.errorcode[e.errno]))"WatchdogHelper: tickled watchdog on %s (%ds to reboot)",
self._client.hostname, self._hw_interval)
# machine should became unpingable after lockup
# ...give 5 seconds slack...
wait_down = self._hw_interval + 5
if not self._client.wait_down(timeout=wait_down):
raise error.TestError('machine should be unpingable '
'within %d seconds' % wait_down)
# make sure the machine comes back,
# DHCP can take up to 45 seconds in odd cases.
if not self._client.wait_up(timeout=timeout):
raise error.TestError('machine did not reboot/ping within '
'%d seconds of HW reset' % timeout)
def __exit__(self, exception, value, traceback):