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How to use _who_last method in lisa

Best Python code snippet using lisa_python

reboot.py

Source:reboot.py

...20from .uptime import Uptime21from .who import Who22# this method is easy to stuck on reboot, so use timeout to recycle it faster.23@func_set_timeout(30)  # type: ignore24def _who_last(who: Who) -> datetime:25    return who.last_boot()26class Reboot(Tool):27    def _initialize(self, *args: Any, **kwargs: Any) -> None:28        # timeout to wait29        self._command = "/sbin/reboot"30    @property31    def command(self) -> str:32        return self._command33    @classmethod34    def _windows_tool(cls) -> Optional[Type[Tool]]:35        return WindowsReboot36    def _check_exists(self) -> bool:37        return True38    def reboot_and_check_panic(self, log_path: Path) -> None:39        try:40            self.reboot()41        except Exception as identifier:42            if self.node.features.is_supported(SerialConsole):43                # if there is any panic, fail before partial pass44                serial_console = self.node.features[SerialConsole]45                serial_console.check_panic(46                    saved_path=log_path,47                    stage="reboot",48                )49            # if node cannot be connected after reboot, it should be failed.50            if isinstance(identifier, TcpConnectionException):51                raise BadEnvironmentStateException(f"after reboot, {identifier}")52            raise identifier53    def reboot(self, time_out: int = 300) -> None:54        who = self.node.tools[Who]55        timer = create_timer()56        # who -b doesn't return correct content in Ubuntu 14.04, but uptime works.57        # uptime has no -s parameter in some distros, so not use is as default.58        try:59            last_boot_time = who.last_boot()60        except Exception:61            uptime = self.node.tools[Uptime]62            last_boot_time = uptime.since_time()63        current_boot_time = last_boot_time64        # who -b returns time without seconds.65        # so if the node rebooted in one minute, the who -b is not changed.66        # The reboot will wait forever.67        # in this case, verify the time is wait enough to prevent this problem.68        date = self.node.tools[Date]69        # boot time has no tzinfo, so remove from date result to avoid below error.70        # TypeError: can't subtract offset-naive and offset-aware datetimes71        current_delta = date.current().replace(tzinfo=None) - current_boot_time72        self._log.debug(f"delta time since last boot: {current_delta}")73        while current_delta < timedelta(minutes=1):74            # wait until one minute75            wait_seconds = 60 - current_delta.seconds + 176            self._log.debug(f"waiting {wait_seconds} seconds before rebooting")77            sleep(wait_seconds)78            current_delta = date.current().replace(tzinfo=None) - current_boot_time79        # Get reboot execution path80        # Not all distros have the same reboot execution path81        command_result = self.node.execute(82            "command -v reboot", shell=True, sudo=True, no_info_log=True83        )84        if command_result.exit_code == 0:85            self._command = command_result.stdout86        self._log.debug(f"rebooting with boot time: {last_boot_time}")87        try:88            # Reboot is not reliable, and sometime stuck,89            # like SUSE sles-15-sp1-sapcal gen1 2020.10.23.90            # In this case, use timeout to prevent hanging.91            self.run(force_run=True, sudo=True, timeout=10)92        except Exception as identifier:93            # it doesn't matter to exceptions here. The system may reboot fast94            self._log.debug(f"ignorable exception on rebooting: {identifier}")95        connected: bool = False96        # The previous steps may take longer time than time out. After that, it97        # needs to connect at least once.98        tried_times: int = 099        while (timer.elapsed(False) < time_out) or tried_times < 1:100            tried_times += 1101            try:102                self.node.close()103                current_boot_time = _who_last(who)104                connected = True105            except FunctionTimedOut as identifier:106                # The FunctionTimedOut must be caught separated, or the process107                # will exit.108                self._log.debug(f"ignorable timeout exception: {identifier}")109            except Exception as identifier:110                # error is ignorable, as ssh may be closed suddenly.111                self._log.debug(f"ignorable ssh exception: {identifier}")112            self._log.debug(f"reconnected with uptime: {current_boot_time}")113            if last_boot_time < current_boot_time:114                break115        if last_boot_time == current_boot_time:116            if connected:117                raise LisaException(...

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