1# Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
2# Use of this source code is governed by a BSD-style license that can be
3# found in the LICENSE file.
4
5import logging
6from autotest_lib.server.cros.faft.firmware_test import FirmwareTest
7from autotest_lib.client.common_lib import error
8
9
10class firmware_UpdateKernelVersion(FirmwareTest):
11    """
12    This is a server based kernel update test which should run in developer
13    mode. On runtime, this test modifies the kernel version of kernel b and
14    modifies cgpt to reboot with kernel b. Check kernel version after reboot,
15    and then recover kernel b version to original version. Here also tries to
16    reboot with kernel b after recovery. If success, reboot with kernel a.
17    """
18    version = 1
19
20    def check_kernel_version(self, expected_ver):
21        """Checks the kernel version."""
22        actual_ver = self.faft_client.kernel.get_version('b')
23        if actual_ver != expected_ver:
24            raise error.TestFail(
25                'Kernel Version should be %s, but got %s.'
26                % (expected_ver, actual_ver))
27        else:
28            logging.info(
29                'Update success, now version is %s',
30                actual_ver)
31
32    def modify_kernel_b_and_set_cgpt_priority(self, delta, target_dev):
33        """Modifies kernel B and sets CGPT priority."""
34        if delta == 1:
35            self.faft_client.kernel.move_version_forward('b')
36        elif delta == -1:
37            self.check_kernel_version(self._update_version)
38            self.faft_client.kernel.move_version_backward('b')
39
40        if target_dev == 'a':
41            self.reset_and_prioritize_kernel('a')
42        else:
43            self.reset_and_prioritize_kernel('b')
44
45    def initialize(self, host, cmdline_args, dev_mode=True):
46        """Initialize the test"""
47        super(firmware_UpdateKernelVersion, self).initialize(host, cmdline_args)
48
49        self.switcher.setup_mode('dev' if dev_mode else 'normal',
50                                 allow_gbb_force=True)
51
52        actual_ver = self.faft_client.kernel.get_version('b')
53        logging.info('Original Kernel Version of KERN-B is %s', actual_ver)
54
55        self._update_version = actual_ver + 1
56        logging.info('KERN-B will update to version %s', self._update_version)
57
58        self.setup_kernel('a')
59
60    def cleanup(self):
61        """Cleanup after the test"""
62        super(firmware_UpdateKernelVersion, self).cleanup()
63
64    def run_once(self):
65        """Runs a single iteration of the test."""
66        logging.info("Update Kernel Version.")
67        self.check_state((self.check_root_part_on_non_recovery, 'a'))
68        self.modify_kernel_b_and_set_cgpt_priority(1, 'b')
69        self.switcher.mode_aware_reboot()
70
71        logging.info("Check kernel version and rollback.")
72        self.check_state((self.check_root_part_on_non_recovery, 'b'))
73        self.modify_kernel_b_and_set_cgpt_priority(-1, 'b')
74        self.switcher.mode_aware_reboot()
75
76        logging.info("Boot with rollback kernel and change boot priority.")
77        self.check_state((self.check_root_part_on_non_recovery, 'b'))
78        self.modify_kernel_b_and_set_cgpt_priority(0, 'a')
79        self.switcher.mode_aware_reboot()
80
81        logging.info("Check rollback version.")
82        self.check_state((self.check_root_part_on_non_recovery, 'a'))
83        self.check_kernel_version(self._update_version - 1)
84