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      1 #!/usr/bin/env python
      2 #
      3 # Copyright (C) 2017 The Android Open Source Project
      4 #
      5 # Licensed under the Apache License, Version 2.0 (the "License");
      6 # you may not use this file except in compliance with the License.
      7 # You may obtain a copy of the License at
      8 #
      9 #      http://www.apache.org/licenses/LICENSE-2.0
     10 #
     11 # Unless required by applicable law or agreed to in writing, software
     12 # distributed under the License is distributed on an "AS IS" BASIS,
     13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     14 # See the License for the specific language governing permissions and
     15 # limitations under the License.
     16 #
     17 
     18 import logging
     19 import re
     20 
     21 from vts.runners.host import asserts
     22 from vts.runners.host import base_test
     23 from vts.runners.host import test_runner
     24 from vts.utils.python.controllers import android_device
     25 from vts.utils.python.file import file_utils
     26 
     27 
     28 class KernelApiSysfsTest(base_test.BaseTestClass):
     29     '''Test cases which check sysfs files.'''
     30 
     31     def setUpClass(self):
     32         self.dut = self.registerController(android_device)[0]
     33         self.dut.shell.InvokeTerminal(
     34             'default')  # creates a remote shell instance.
     35         self.shell = self.dut.shell.default
     36 
     37     def ConvertToInteger(self, text):
     38         '''Check whether a given text is interger.
     39 
     40         Args:
     41             text: object, usually a string representing the content of a file
     42 
     43         Returns:
     44             bool, True if is integer
     45         '''
     46         try:
     47             return int(text)
     48         except ValueError as e:
     49             logging.exception(e)
     50             asserts.fail('Content "%s" is not integer' % text)
     51 
     52     def MatchRegex(self, regex, string):
     53         '''Check whether a string completely matches a given regex.
     54 
     55         Assertions will fail if given string is not a complete match.
     56 
     57         Args:
     58             regex: string, regex pattern to match
     59             string: string, given string for matching
     60         '''
     61         pattern = re.compile(regex)
     62         match = pattern.match(string)
     63         message = 'String "%s" is not a complete match of regex "%s".' % (
     64             string, regex)
     65         asserts.assertTrue(match is not None, message)
     66         asserts.assertEqual(match.start(), 0, message)
     67         asserts.assertEqual(match.end(), len(string), message)
     68 
     69     def IsReadOnly(self, path):
     70         '''Check whether a given path is read only.
     71 
     72         Assertion will fail if given path does not exist or is not read only.
     73         '''
     74         permission = ''
     75         try:
     76             permission = file_utils.GetPermission(path, self.shell)
     77         except IOError as e:
     78             logging.exception(e)
     79             asserts.fail('Path "%s" does not exist or has invalid '
     80                          'permission bits' % path)
     81 
     82         try:
     83             asserts.assertTrue(
     84                 file_utils.IsReadOnly(permission),
     85                 'path %s is not read only' % path)
     86         except IOError as e:
     87             logging.exception(e)
     88             asserts.fail('Got invalid permission bits "%s" for path "%s"' %
     89                          (permission, path))
     90 
     91     def testCpuOnlineFormat(self):
     92         '''Check the format of cpu online file.
     93 
     94         Confirm /sys/devices/system/cpu/online exists and is read-only.
     95         Parse contents to ensure it is a comma-separated series of ranges
     96         (%d-%d) and/or integers.
     97         '''
     98         filepath = '/sys/devices/system/cpu/online'
     99         self.IsReadOnly(filepath)
    100         content = file_utils.ReadFileContent(filepath, self.shell)
    101         regex = '(\d+(-\d+)?)(,\d+(-\d+)?)*'
    102         if content.endswith('\n'):
    103             content = content[:-1]
    104         self.MatchRegex(regex, content)
    105 
    106     def testLastResumeReason(self):
    107         '''Check /sys/kernel/wakeup_reasons/last_resume_reason.'''
    108         filepath = '/sys/kernel/wakeup_reasons/last_resume_reason'
    109         self.IsReadOnly(filepath)
    110 
    111     def testKernelMax(self):
    112         '''Check the value of /sys/devices/system/cpu/kernel_max.'''
    113         filepath = '/sys/devices/system/cpu/kernel_max'
    114         self.IsReadOnly(filepath)
    115         content = file_utils.ReadFileContent(filepath, self.shell)
    116         self.ConvertToInteger(content)
    117 
    118 
    119 if __name__ == "__main__":
    120     test_runner.main()
    121