How to use __unload_netconsole_module method in autotest

Best Python code snippet using autotest_python

netconsole.py

Source:netconsole.py

...51        stdout = stderr = open(os.devnull, "w")52        self.__logger = subprocess.Popen(cmd, stdin=stdin, stdout=stdout,53                                         stderr=stderr)54        os.close(w)55        self.__unload_netconsole_module()56        self.__load_netconsole_module()57    def stop_loggers(self):58        super(NetconsoleHost, self).stop_loggers()59        if self.__logger:60            utils.nuke_subprocess(self.__logger)61            self.__logger = None62            if self.job:63                self.job.warning_loggers.discard(self.__warning_stream)64            self.__warning_stream.close()65    def reboot_setup(self, *args, **dargs):66        super(NetconsoleHost, self).reboot_setup(*args, **dargs)67        if self.__netconsole_params is not None:68            label = dargs.get("label", None)69            if not label:70                label = self.bootloader.get_default_title()71            args = "debug " + self.__netconsole_params72            self.bootloader.add_args(label, args)73        self.__unload_netconsole_module()74    def reboot_followup(self, *args, **dargs):75        super(NetconsoleHost, self).reboot_followup(*args, **dargs)76        self.__load_netconsole_module()77    def __determine_netconsole_params(self):78        """79        Connect to the remote machine and determine the values to use for the80        required netconsole parameters.81        """82        # determine the IP addresses of the local and remote machine83        # PROBLEM: on machines with multiple IPs this may not make any sense84        # It also doesn't work with IPv685        remote_ip = socket.gethostbyname(self.hostname)86        local_ip = socket.gethostbyname(socket.gethostname())87        # Get the gateway of the remote machine88        try:89            traceroute = self.run('traceroute -n %s' % local_ip)90        except error.AutoservRunError:91            return92        first_node = traceroute.stdout.split("\n")[0]93        match = re.search(r'\s+((\d+\.){3}\d+)\s+', first_node)94        if match:95            router_ip = match.group(1)96        else:97            return98        # Look up the MAC address of the gateway99        try:100            self.run('ping -c 1 %s' % router_ip)101            arp = self.run('arp -n -a %s' % router_ip)102        except error.AutoservRunError:103            return104        match = re.search(r'\s+(([0-9A-F]{2}:){5}[0-9A-F]{2})\s+', arp.stdout)105        if match:106            gateway_mac = match.group(1)107        else:108            return None109        return 'netconsole=@%s/,%s@%s/%s' % (remote_ip, self.__port, local_ip,110                                             gateway_mac)111    def __load_netconsole_module(self):112        """113        Make a best effort to load the netconsole module.114        Note that loading the module can fail even when the remote machine is115        working correctly if netconsole is already compiled into the kernel116        and started.117        """118        if self.__netconsole_params is None:119            return120        try:121            self.run('dmesg -n 8')122            self.run('modprobe netconsole %s' % self.__netconsole_params)123        except error.AutoservRunError, e:124            # if it fails there isn't much we can do, just keep going125            print "ERROR occurred while loading netconsole: %s" % e126    def __unload_netconsole_module(self):127        try:128            self.run('modprobe -r netconsole')129        except error.AutoservRunError:...

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