ext2_filesystem_unittest.cc revision d8b67f49d7f8ae291cd4fa901b2d3767137704e7 
1//
2// Copyright (C) 2015 The Android Open Source Project
3//
4// Licensed under the Apache License, Version 2.0 (the "License");
5// you may not use this file except in compliance with the License.
6// You may obtain a copy of the License at
7//
8//      http://www.apache.org/licenses/LICENSE-2.0
9//
10// Unless required by applicable law or agreed to in writing, software
11// distributed under the License is distributed on an "AS IS" BASIS,
12// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13// See the License for the specific language governing permissions and
14// limitations under the License.
15//
16
17#include "update_engine/payload_generator/ext2_filesystem.h"
18
19#include <unistd.h>
20
21#include <map>
22#include <set>
23#include <string>
24#include <vector>
25
26#include <base/format_macros.h>
27#include <base/logging.h>
28#include <base/strings/string_number_conversions.h>
29#include <base/strings/string_util.h>
30#include <base/strings/stringprintf.h>
31#include <gtest/gtest.h>
32
33#include "update_engine/common/test_utils.h"
34#include "update_engine/common/utils.h"
35#include "update_engine/payload_generator/extent_utils.h"
36
37using chromeos_update_engine::test_utils::GetBuildArtifactsPath;
38using std::map;
39using std::set;
40using std::string;
41using std::unique_ptr;
42using std::vector;
43
44namespace chromeos_update_engine {
45
46namespace {
47
48uint64_t kDefaultFilesystemSize = 4 * 1024 * 1024;
49size_t kDefaultFilesystemBlockCount = 1024;
50size_t kDefaultFilesystemBlockSize = 4096;
51
52// Checks that all the blocks in |extents| are in the range [0, total_blocks).
53void ExpectBlocksInRange(const vector<Extent>& extents, uint64_t total_blocks) {
54  for (const Extent& extent : extents) {
55    EXPECT_LE(0U, extent.start_block());
56    EXPECT_LE(extent.start_block() + extent.num_blocks(), total_blocks);
57  }
58}
59
60}  // namespace
61
62class Ext2FilesystemTest : public ::testing::Test {};
63
64TEST_F(Ext2FilesystemTest, InvalidFilesystem) {
65  test_utils::ScopedTempFile fs_filename_{"Ext2FilesystemTest-XXXXXX"};
66  ASSERT_EQ(0, truncate(fs_filename_.path().c_str(), kDefaultFilesystemSize));
67  unique_ptr<Ext2Filesystem> fs =
68      Ext2Filesystem::CreateFromFile(fs_filename_.path());
69  ASSERT_EQ(nullptr, fs.get());
70
71  fs = Ext2Filesystem::CreateFromFile("/path/to/invalid/file");
72  ASSERT_EQ(nullptr, fs.get());
73}
74
75TEST_F(Ext2FilesystemTest, EmptyFilesystem) {
76  unique_ptr<Ext2Filesystem> fs = Ext2Filesystem::CreateFromFile(
77      GetBuildArtifactsPath("gen/disk_ext2_4k_empty.img"));
78
79  ASSERT_NE(nullptr, fs.get());
80  EXPECT_EQ(kDefaultFilesystemBlockCount, fs->GetBlockCount());
81  EXPECT_EQ(kDefaultFilesystemBlockSize, fs->GetBlockSize());
82
83  vector<FilesystemInterface::File> files;
84  EXPECT_TRUE(fs->GetFiles(&files));
85
86  map<string, FilesystemInterface::File> map_files;
87  for (const auto& file : files) {
88    EXPECT_EQ(map_files.end(), map_files.find(file.name))
89        << "File " << file.name << " repeated in the list.";
90    map_files[file.name] = file;
91    ExpectBlocksInRange(file.extents, fs->GetBlockCount());
92  }
93  EXPECT_EQ(2U, map_files["/"].file_stat.st_ino);
94  EXPECT_FALSE(map_files["<free-space>"].extents.empty());
95}
96
97// This test parses the sample images generated during build time with the
98// "generate_image.sh" script. The expected conditions of each file in these
99// images is encoded in the file name, as defined in the mentioned script.
100TEST_F(Ext2FilesystemTest, ParseGeneratedImages) {
101  const vector<string> kGeneratedImages = {
102      "disk_ext2_1k.img",
103      "disk_ext2_4k.img" };
104  base::FilePath build_path = GetBuildArtifactsPath().Append("gen");
105  for (const string& fs_name : kGeneratedImages) {
106    LOG(INFO) << "Testing " << fs_name;
107    unique_ptr<Ext2Filesystem> fs = Ext2Filesystem::CreateFromFile(
108        build_path.Append(fs_name).value());
109    ASSERT_NE(nullptr, fs.get());
110
111    vector<FilesystemInterface::File> files;
112    map<string, FilesystemInterface::File> map_files;
113    set<string> filenames;
114    EXPECT_TRUE(fs->GetFiles(&files));
115    for (const auto& file : files) {
116      // Check no repeated files. We should parse hard-links with two different
117      // names.
118      EXPECT_EQ(map_files.end(), map_files.find(file.name))
119          << "File " << file.name << " repeated in the list.";
120      map_files[file.name] = file;
121      filenames.insert(file.name);
122      ExpectBlocksInRange(file.extents, fs->GetBlockCount());
123    }
124
125    // Check that all the files are parsed, and the /removed file should not
126    // be included in the list.
127    set<string> kExpectedFiles = {
128        "/",
129        "/cdev",
130        "/dir1",
131        "/dir1/file",
132        "/dir1/dir2",
133        "/dir1/dir2/file",
134        "/dir1/dir2/dir1",
135        "/empty-file",
136        "/fifo",
137        "/link-hard-regular-16k",
138        "/link-long_symlink",
139        "/link-short_symlink",
140        "/lost+found",
141        "/regular-small",
142        "/regular-16k",
143        "/regular-32k-zeros",
144        "/regular-with_net_cap",
145        "/sparse_empty-10k",
146        "/sparse_empty-2blocks",
147        "/sparse-10000blocks",
148        "/sparse-16k-last_block",
149        "/sparse-16k-first_block",
150        "/sparse-16k-holes",
151        "<inode-blocks>",
152        "<free-space>",
153        "<group-descriptors>",
154    };
155    EXPECT_EQ(kExpectedFiles, filenames);
156
157    FilesystemInterface::File file;
158
159    // Small symlinks don't actually have data blocks.
160    EXPECT_TRUE(map_files["/link-short_symlink"].extents.empty());
161    EXPECT_EQ(1U,
162              utils::BlocksInExtents(map_files["/link-long_symlink"].extents));
163
164    // Hard-links report the same list of blocks.
165    EXPECT_EQ(map_files["/link-hard-regular-16k"].extents,
166              map_files["/regular-16k"].extents);
167    EXPECT_FALSE(map_files["/regular-16k"].extents.empty());
168
169    // The number of blocks in these files doesn't depend on the
170    // block size.
171    EXPECT_TRUE(map_files["/empty-file"].extents.empty());
172    EXPECT_EQ(1U, utils::BlocksInExtents(map_files["/regular-small"].extents));
173    EXPECT_EQ(
174        1U, utils::BlocksInExtents(map_files["/regular-with_net_cap"].extents));
175    EXPECT_TRUE(map_files["/sparse_empty-10k"].extents.empty());
176    EXPECT_TRUE(map_files["/sparse_empty-2blocks"].extents.empty());
177    EXPECT_EQ(
178        1U,
179        utils::BlocksInExtents(map_files["/sparse-16k-last_block"].extents));
180    EXPECT_EQ(
181        1U,
182        utils::BlocksInExtents(map_files["/sparse-16k-first_block"].extents));
183    EXPECT_EQ(2U,
184              utils::BlocksInExtents(map_files["/sparse-16k-holes"].extents));
185  }
186}
187
188TEST_F(Ext2FilesystemTest, LoadSettingsFailsTest) {
189  unique_ptr<Ext2Filesystem> fs = Ext2Filesystem::CreateFromFile(
190      GetBuildArtifactsPath("gen/disk_ext2_1k.img"));
191  ASSERT_NE(nullptr, fs.get());
192
193  brillo::KeyValueStore store;
194  // disk_ext2_1k.img doesn't have the /etc/update_engine.conf file.
195  EXPECT_FALSE(fs->LoadSettings(&store));
196}
197
198TEST_F(Ext2FilesystemTest, LoadSettingsWorksTest) {
199  unique_ptr<Ext2Filesystem> fs = Ext2Filesystem::CreateFromFile(
200      GetBuildArtifactsPath("gen/disk_ext2_unittest.img"));
201  ASSERT_NE(nullptr, fs.get());
202
203  brillo::KeyValueStore store;
204  EXPECT_TRUE(fs->LoadSettings(&store));
205  string minor_version;
206  EXPECT_TRUE(store.GetString("PAYLOAD_MINOR_VERSION", &minor_version));
207  EXPECT_EQ("1234", minor_version);
208}
209
210}  // namespace chromeos_update_engine
211