1# Copyright 2016 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 common
6from autotest_lib.client.common_lib import error
7from autotest_lib.server import test
8
9
10class android_Invariants(test.test):
11    """Verify basic characteristics common to all Android devices."""
12    version = 1
13
14
15    def assert_path_test(self, path, test, negative=False):
16        """Performs a test against a path.
17
18        See the man page for test(1) for valid tests (e.g. -e, -b, -d).
19
20        @param path: the path to check.
21        @param test: the test to perform, without leading dash.
22        @param negative: if True, test for the negative.
23        """
24        self.host.run('test %s -%s %s' % ('!' if negative else '', test, path))
25
26
27    def assert_selinux_context(self, path, ctx):
28        """Checks the selinux context of a path.
29
30        @param path: the path to check.
31        @param ctx: the selinux context to check for.
32
33        @raises error.TestFail
34        """
35        # Example output of 'ls -LZ /dev/block/by-name/misc' is:
36        # u:object_r:misc_block_device:s0 /dev/block/by-name/misc
37        tokens = self.host.run_output('ls -LZ %s' % path).split()
38        path_ctx = tokens[0]
39        if not ctx in path_ctx:
40            raise error.TestFail('Context "%s" for path "%s" does not '
41                                 'contain "%s"' % (path_ctx, path, ctx))
42
43
44    def check_fstab_name(self):
45        """Checks that the fstab file has the name /fstab.<ro.hardware>.
46        """
47        hardware = self.host.run_output('getprop ro.hardware')
48        self.assert_path_test('/fstab.%s' % hardware, 'e')
49
50
51    def run_once(self, host=None):
52        """Verify basic characteristics common to all Android devices.
53
54        @param host: host object representing the device under test.
55        """
56        self.host = host
57        self.check_fstab_name()
58