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How to use boot_once_grub2 method in autotest

Best Python code snippet using autotest_python

boottool.py

Source:boottool.py

...1305                return -11306        if bootloader == 'grub':1307            return self.boot_once_grub(entry_index)1308        elif bootloader == 'grub2':1309            return self.boot_once_grub2(entry_index)1310        elif bootloader == 'yaboot':1311            return self.boot_once_yaboot(title)1312        elif bootloader == 'elilo':1313            return self.boot_once_elilo(entry_index)1314        else:1315            self.log.error("Detected bootloader does not implement boot once")1316            return -11317    def boot_once_grub(self, entry_index):1318        '''1319        Implements the boot once feature for the grub bootloader1320        '''1321        # grubonce is a hack present in distros like OpenSUSE1322        grubonce_cmd = find_executable('grubonce')1323        if grubonce_cmd is None:1324            # XXX: check the type of default set (numeric or "saved")1325            grub_instructions = ['savedefault --default=%s --once' %1326                                 entry_index, 'quit']1327            grub_instructions_text = '\n'.join(grub_instructions)1328            grub_binary = find_executable('grub')1329            if grub_binary is None:1330                self.log.error("Could not find the 'grub' binary, aborting")1331                return -11332            p = subprocess.Popen([grub_binary, '--batch'],1333                                 stdin=subprocess.PIPE,1334                                 stdout=subprocess.PIPE,1335                                 stderr=subprocess.PIPE)1336            out, err = p.communicate(grub_instructions_text)1337            complete_out = ''1338            if out is not None:1339                complete_out = out1340            if err is not None:1341                complete_out += "\n%s" % err1342            grub_batch_err = []1343            if complete_out:1344                for l in complete_out.splitlines():1345                    if re.search('error', l, re.IGNORECASE):1346                        grub_batch_err.append(l)1347                if grub_batch_err:1348                    self.log.error("Error while running grub to set boot "1349                                   "once: %s", "\n".join(grub_batch_err))1350                    return -11351            self.log.debug('No error detected while running grub to set boot '1352                           'once')1353            return 01354        else:1355            rc = self._run_get_return([grubonce_cmd, str(entry_index)])1356            if rc:1357                self.log.error('Error running %s', grubonce_cmd)1358            else:1359                self.log.debug('No error detected while running %s',1360                               grubonce_cmd)1361            return rc1362    def boot_once_grub2(self, entry_index):1363        '''1364        Implements the boot once feature for the grub2 bootloader1365        Caveat: this assumes the default set is of type "saved", and not a1366        numeric value.1367        '''1368        default_index_re = re.compile('\s*set\s+default\s*=\s*\"+(\d+)\"+')1369        grub_reboot_names = ['grub-reboot', 'grub2-reboot']1370        grub_reboot_exec = None1371        for grub_reboot in grub_reboot_names:1372            grub_reboot_exec = find_executable(grub_reboot)1373            if grub_reboot_exec is not None:1374                break1375        if grub_reboot_exec is None:1376            self.log.error('Could not find executable among searched names: '...

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