tests/component/applypatch_test.cpp - android_bootable_recovery - Gitiles

 /*
  * Copyright (C) 2016 The Android Open Source Project
  *
  * Licensed under the Apache License, version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agree to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #include <dirent.h>
 #include <fcntl.h>
 #include <gtest/gtest.h>
 #include <libgen.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <sys/stat.h>
 #include <sys/statvfs.h>
 #include <sys/types.h>
 #include <time.h>

 #include <algorithm>
 #include <memory>
 #include <string>
 #include <vector>

 #include <android-base/file.h>
 #include <android-base/logging.h>
 #include <android-base/stringprintf.h>
 #include <android-base/test_utils.h>
 #include <android-base/unique_fd.h>
 #include <bsdiff/bsdiff.h>
 #include <openssl/sha.h>

 #include "applypatch/applypatch.h"
 #include "applypatch/applypatch_modes.h"
 #include "common/test_constants.h"
 #include "otautil/cache_location.h"
 #include "otautil/print_sha1.h"

 using namespace std::string_literals;

 static void sha1sum(const std::string& fname, std::string* sha1, size_t* fsize = nullptr) {
   ASSERT_TRUE(sha1 != nullptr);

   std::string data;
   ASSERT_TRUE(android::base::ReadFileToString(fname, &data));

   if (fsize != nullptr) {
     *fsize = data.size();
   }

   uint8_t digest[SHA_DIGEST_LENGTH];
   SHA1(reinterpret_cast<const uint8_t*>(data.c_str()), data.size(), digest);
   *sha1 = print_sha1(digest);
 }

 static void mangle_file(const std::string& fname) {
   std::string content(1024, '\0');
   for (size_t i = 0; i < 1024; i++) {
     content[i] = rand() % 256;
   }
   ASSERT_TRUE(android::base::WriteStringToFile(content, fname));
 }

 static void test_logger(android::base::LogId /* id */, android::base::LogSeverity severity,
                         const char* /* tag */, const char* /* file */, unsigned int /* line */,
                         const char* message) {
   if (severity >= android::base::GetMinimumLogSeverity()) {
     fprintf(stdout, "%s\n", message);
   }
 }

 class ApplyPatchTest : public ::testing::Test {
  public:
   virtual void SetUp() override {
     // set up files
     old_file = from_testdata_base("old.file");
     new_file = from_testdata_base("new.file");
     nonexistent_file = from_testdata_base("nonexistent.file");

     // set up SHA constants
     sha1sum(old_file, &old_sha1, &old_size);
     sha1sum(new_file, &new_sha1, &new_size);
     srand(time(nullptr));
     bad_sha1_a = android::base::StringPrintf("%040x", rand());
     bad_sha1_b = android::base::StringPrintf("%040x", rand());
   }

   std::string old_file;
   std::string new_file;
   std::string nonexistent_file;

   std::string old_sha1;
   std::string new_sha1;
   std::string bad_sha1_a;
   std::string bad_sha1_b;

   size_t old_size;
   size_t new_size;
 };

 class ApplyPatchCacheTest : public ApplyPatchTest {
  protected:
   void SetUp() override {
     ApplyPatchTest::SetUp();
     CacheLocation::location().set_cache_temp_source(old_file);
   }
 };

 class ApplyPatchModesTest : public ::testing::Test {
  protected:
   void SetUp() override {
     CacheLocation::location().set_cache_temp_source(cache_source.path);
     android::base::InitLogging(nullptr, &test_logger);
     android::base::SetMinimumLogSeverity(android::base::LogSeverity::DEBUG);
   }

   TemporaryFile cache_source;
 };

 class FreeCacheTest : public ::testing::Test {
  protected:
   static constexpr size_t PARTITION_SIZE = 4096 * 10;

   // Returns a sorted list of files in |dirname|.
   static std::vector<std::string> FindFilesInDir(const std::string& dirname) {
     std::vector<std::string> file_list;

     std::unique_ptr<DIR, decltype(&closedir)> d(opendir(dirname.c_str()), closedir);
     struct dirent* de;
     while ((de = readdir(d.get())) != 0) {
       std::string path = dirname + "/" + de->d_name;

       struct stat st;
       if (stat(path.c_str(), &st) == 0 && S_ISREG(st.st_mode)) {
         file_list.emplace_back(de->d_name);
       }
     }

     std::sort(file_list.begin(), file_list.end());
     return file_list;
   }

   static void AddFilesToDir(const std::string& dir, const std::vector<std::string>& files) {
     std::string zeros(4096, 0);
     for (const auto& file : files) {
       std::string path = dir + "/" + file;
       ASSERT_TRUE(android::base::WriteStringToFile(zeros, path));
     }
   }

   void SetUp() override {
     CacheLocation::location().set_cache_log_directory(mock_log_dir.path);
   }

   // A mock method to calculate the free space. It assumes the partition has a total size of 40960
   // bytes and all files are 4096 bytes in size.
   size_t MockFreeSpaceChecker(const std::string& dirname) {
     std::vector<std::string> files = FindFilesInDir(dirname);
     return PARTITION_SIZE - 4096 * files.size();
   }

   TemporaryDir mock_cache;
   TemporaryDir mock_log_dir;
 };

 TEST_F(ApplyPatchTest, CheckModeSkip) {
   std::vector<std::string> sha1s;
   ASSERT_EQ(0, applypatch_check(&old_file[0], sha1s));
 }

 TEST_F(ApplyPatchTest, CheckModeSingle) {
   std::vector<std::string> sha1s = { old_sha1 };
   ASSERT_EQ(0, applypatch_check(&old_file[0], sha1s));
 }

 TEST_F(ApplyPatchTest, CheckModeMultiple) {
   std::vector<std::string> sha1s = { bad_sha1_a, old_sha1, bad_sha1_b };
   ASSERT_EQ(0, applypatch_check(&old_file[0], sha1s));
 }

 TEST_F(ApplyPatchTest, CheckModeFailure) {
   std::vector<std::string> sha1s = { bad_sha1_a, bad_sha1_b };
   ASSERT_NE(0, applypatch_check(&old_file[0], sha1s));
 }

 TEST_F(ApplyPatchTest, CheckModeEmmcTarget) {
   // EMMC:old_file:size:sha1 should pass the check.
   std::string src_file =
       "EMMC:" + old_file + ":" + std::to_string(old_size) + ":" + old_sha1;
   std::vector<std::string> sha1s;
   ASSERT_EQ(0, applypatch_check(src_file.c_str(), sha1s));

   // EMMC:old_file:(size-1):sha1:(size+1):sha1 should fail the check.
   src_file = "EMMC:" + old_file + ":" + std::to_string(old_size - 1) + ":" + old_sha1 + ":" +
              std::to_string(old_size + 1) + ":" + old_sha1;
   ASSERT_EQ(1, applypatch_check(src_file.c_str(), sha1s));

   // EMMC:old_file:(size-1):sha1:size:sha1:(size+1):sha1 should pass the check.
   src_file = "EMMC:" + old_file + ":" +
              std::to_string(old_size - 1) + ":" + old_sha1 + ":" +
              std::to_string(old_size) + ":" + old_sha1 + ":" +
              std::to_string(old_size + 1) + ":" + old_sha1;
   ASSERT_EQ(0, applypatch_check(src_file.c_str(), sha1s));

   // EMMC:old_file:(size+1):sha1:(size-1):sha1:size:sha1 should pass the check.
   src_file = "EMMC:" + old_file + ":" +
              std::to_string(old_size + 1) + ":" + old_sha1 + ":" +
              std::to_string(old_size - 1) + ":" + old_sha1 + ":" +
              std::to_string(old_size) + ":" + old_sha1;
   ASSERT_EQ(0, applypatch_check(src_file.c_str(), sha1s));

   // EMMC:new_file:(size+1):old_sha1:(size-1):old_sha1:size:old_sha1:size:new_sha1
   // should pass the check.
   src_file = "EMMC:" + new_file + ":" +
              std::to_string(old_size + 1) + ":" + old_sha1 + ":" +
              std::to_string(old_size - 1) + ":" + old_sha1 + ":" +
              std::to_string(old_size) + ":" + old_sha1 + ":" +
              std::to_string(new_size) + ":" + new_sha1;
   ASSERT_EQ(0, applypatch_check(src_file.c_str(), sha1s));
 }

 TEST_F(ApplyPatchCacheTest, CheckCacheCorruptedSourceSingle) {
   TemporaryFile temp_file;
   mangle_file(temp_file.path);
   std::vector<std::string> sha1s_single = { old_sha1 };
   ASSERT_EQ(0, applypatch_check(temp_file.path, sha1s_single));
   ASSERT_EQ(0, applypatch_check(nonexistent_file.c_str(), sha1s_single));
 }

 TEST_F(ApplyPatchCacheTest, CheckCacheCorruptedSourceMultiple) {
   TemporaryFile temp_file;
   mangle_file(temp_file.path);
   std::vector<std::string> sha1s_multiple = { bad_sha1_a, old_sha1, bad_sha1_b };
   ASSERT_EQ(0, applypatch_check(temp_file.path, sha1s_multiple));
   ASSERT_EQ(0, applypatch_check(nonexistent_file.c_str(), sha1s_multiple));
 }

 TEST_F(ApplyPatchCacheTest, CheckCacheCorruptedSourceFailure) {
   TemporaryFile temp_file;
   mangle_file(temp_file.path);
   std::vector<std::string> sha1s_failure = { bad_sha1_a, bad_sha1_b };
   ASSERT_NE(0, applypatch_check(temp_file.path, sha1s_failure));
   ASSERT_NE(0, applypatch_check(nonexistent_file.c_str(), sha1s_failure));
 }

 TEST_F(ApplyPatchModesTest, InvalidArgs) {
   // At least two args (including the filename).
   ASSERT_EQ(2, applypatch_modes(1, (const char* []){ "applypatch" }));

   // Unrecognized args.
   ASSERT_EQ(2, applypatch_modes(2, (const char* []){ "applypatch", "-x" }));
 }

 TEST_F(ApplyPatchModesTest, PatchModeEmmcTarget) {
   std::string boot_img = from_testdata_base("boot.img");
   size_t boot_img_size;
   std::string boot_img_sha1;
   sha1sum(boot_img, &boot_img_sha1, &boot_img_size);

   std::string recovery_img = from_testdata_base("recovery.img");
   size_t recovery_img_size;
   std::string recovery_img_sha1;
   sha1sum(recovery_img, &recovery_img_sha1, &recovery_img_size);
   std::string recovery_img_size_arg = std::to_string(recovery_img_size);

   std::string bonus_file = from_testdata_base("bonus.file");

   // applypatch -b <bonus-file> <src-file> <tgt-file> <tgt-sha1> <tgt-size> <src-sha1>:<patch>
   std::string src_file_arg =
       "EMMC:" + boot_img + ":" + std::to_string(boot_img_size) + ":" + boot_img_sha1;
   TemporaryFile tgt_file;
   std::string tgt_file_arg = "EMMC:"s + tgt_file.path;
   std::string patch_arg = boot_img_sha1 + ":" + from_testdata_base("recovery-from-boot.p");
   std::vector<const char*> args = { "applypatch",
                                     "-b",
                                     bonus_file.c_str(),
                                     src_file_arg.c_str(),
                                     tgt_file_arg.c_str(),
                                     recovery_img_sha1.c_str(),
                                     recovery_img_size_arg.c_str(),
                                     patch_arg.c_str() };
   ASSERT_EQ(0, applypatch_modes(args.size(), args.data()));
 }

 // Tests patching the EMMC target without a separate bonus file (i.e. recovery-from-boot patch has
 // everything).
 TEST_F(ApplyPatchModesTest, PatchModeEmmcTargetWithoutBonusFile) {
   std::string boot_img = from_testdata_base("boot.img");
   size_t boot_img_size;
   std::string boot_img_sha1;
   sha1sum(boot_img, &boot_img_sha1, &boot_img_size);

   std::string recovery_img = from_testdata_base("recovery.img");
   size_t recovery_img_size;
   std::string recovery_img_sha1;
   sha1sum(recovery_img, &recovery_img_sha1, &recovery_img_size);
   std::string recovery_img_size_arg = std::to_string(recovery_img_size);

   // applypatch <src-file> <tgt-file> <tgt-sha1> <tgt-size> <src-sha1>:<patch>
   std::string src_file_arg =
       "EMMC:" + boot_img + ":" + std::to_string(boot_img_size) + ":" + boot_img_sha1;
   TemporaryFile tgt_file;
   std::string tgt_file_arg = "EMMC:"s + tgt_file.path;
   std::string patch_arg =
       boot_img_sha1 + ":" + from_testdata_base("recovery-from-boot-with-bonus.p");
   std::vector<const char*> args = { "applypatch",
                                     src_file_arg.c_str(),
                                     tgt_file_arg.c_str(),
                                     recovery_img_sha1.c_str(),
                                     recovery_img_size_arg.c_str(),
                                     patch_arg.c_str() };
   ASSERT_EQ(0, applypatch_modes(args.size(), args.data()));
 }

 TEST_F(ApplyPatchModesTest, PatchModeEmmcTargetWithMultiplePatches) {
   std::string boot_img = from_testdata_base("boot.img");
   size_t boot_img_size;
   std::string boot_img_sha1;
   sha1sum(boot_img, &boot_img_sha1, &boot_img_size);

   std::string recovery_img = from_testdata_base("recovery.img");
   size_t recovery_img_size;
   std::string recovery_img_sha1;
   sha1sum(recovery_img, &recovery_img_sha1, &recovery_img_size);
   std::string recovery_img_size_arg = std::to_string(recovery_img_size);

   std::string bonus_file = from_testdata_base("bonus.file");

   // applypatch -b <bonus-file> <src-file> <tgt-file> <tgt-sha1> <tgt-size> \
   //            <src-sha1-fake1>:<patch1> <src-sha1>:<patch2> <src-sha1-fake2>:<patch3>
   std::string src_file_arg =
       "EMMC:" + boot_img + ":" + std::to_string(boot_img_size) + ":" + boot_img_sha1;
   TemporaryFile tgt_file;
   std::string tgt_file_arg = "EMMC:"s + tgt_file.path;
   std::string bad_sha1_a = android::base::StringPrintf("%040x", rand());
   std::string bad_sha1_b = android::base::StringPrintf("%040x", rand());
   std::string patch1 = bad_sha1_a + ":" + from_testdata_base("recovery-from-boot.p");
   std::string patch2 = boot_img_sha1 + ":" + from_testdata_base("recovery-from-boot.p");
   std::string patch3 = bad_sha1_b + ":" + from_testdata_base("recovery-from-boot.p");
   std::vector<const char*> args = { "applypatch",
                                     "-b",
                                     bonus_file.c_str(),
                                     src_file_arg.c_str(),
                                     tgt_file_arg.c_str(),
                                     recovery_img_sha1.c_str(),
                                     recovery_img_size_arg.c_str(),
                                     patch1.c_str(),
                                     patch2.c_str(),
                                     patch3.c_str() };
   // TODO(b/67849209): Remove after addressing the flakiness.
   printf("Calling applypatch_modes with the following args:\n");
   for (const auto& arg : args) {
     printf("  %s\n", arg);
   }
   ASSERT_EQ(0, applypatch_modes(args.size(), args.data()));
 }

 // Ensures that applypatch works with a bsdiff based recovery-from-boot.p.
 TEST_F(ApplyPatchModesTest, PatchModeEmmcTargetWithBsdiffPatch) {
   std::string boot_img_file = from_testdata_base("boot.img");
   std::string boot_img_sha1;
   size_t boot_img_size;
   sha1sum(boot_img_file, &boot_img_sha1, &boot_img_size);

   std::string recovery_img_file = from_testdata_base("recovery.img");
   std::string recovery_img_sha1;
   size_t recovery_img_size;
   sha1sum(recovery_img_file, &recovery_img_sha1, &recovery_img_size);

   // Generate the bsdiff patch of recovery-from-boot.p.
   std::string src_content;
   ASSERT_TRUE(android::base::ReadFileToString(boot_img_file, &src_content));

   std::string tgt_content;
   ASSERT_TRUE(android::base::ReadFileToString(recovery_img_file, &tgt_content));

   TemporaryFile patch_file;
   ASSERT_EQ(0,
             bsdiff::bsdiff(reinterpret_cast<const uint8_t*>(src_content.data()), src_content.size(),
                            reinterpret_cast<const uint8_t*>(tgt_content.data()), tgt_content.size(),
                            patch_file.path, nullptr));

   // applypatch <src-file> <tgt-file> <tgt-sha1> <tgt-size> <src-sha1>:<patch>
   std::string src_file_arg =
       "EMMC:" + boot_img_file + ":" + std::to_string(boot_img_size) + ":" + boot_img_sha1;
   TemporaryFile tgt_file;
   std::string tgt_file_arg = "EMMC:"s + tgt_file.path;
   std::string recovery_img_size_arg = std::to_string(recovery_img_size);
   std::string patch_arg = boot_img_sha1 + ":" + patch_file.path;
   std::vector<const char*> args = { "applypatch",
                                     src_file_arg.c_str(),
                                     tgt_file_arg.c_str(),
                                     recovery_img_sha1.c_str(),
                                     recovery_img_size_arg.c_str(),
                                     patch_arg.c_str() };
   ASSERT_EQ(0, applypatch_modes(args.size(), args.data()));

   // Double check the patched recovery image.
   std::string tgt_file_sha1;
   size_t tgt_file_size;
   sha1sum(tgt_file.path, &tgt_file_sha1, &tgt_file_size);
   ASSERT_EQ(recovery_img_size, tgt_file_size);
   ASSERT_EQ(recovery_img_sha1, tgt_file_sha1);
 }

 TEST_F(ApplyPatchModesTest, PatchModeInvalidArgs) {
   // Invalid bonus file.
   ASSERT_NE(0, applypatch_modes(3, (const char* []){ "applypatch", "-b", "/doesntexist" }));

   std::string bonus_file = from_testdata_base("bonus.file");
   // With bonus file, but missing args.
   ASSERT_EQ(2, applypatch_modes(3, (const char* []){ "applypatch", "-b", bonus_file.c_str() }));

   std::string boot_img = from_testdata_base("boot.img");
   size_t boot_img_size;
   std::string boot_img_sha1;
   sha1sum(boot_img, &boot_img_sha1, &boot_img_size);

   std::string recovery_img = from_testdata_base("recovery.img");
   size_t size;
   std::string recovery_img_sha1;
   sha1sum(recovery_img, &recovery_img_sha1, &size);
   std::string recovery_img_size = std::to_string(size);

   // Bonus file is not supported in flash mode.
   // applypatch -b <bonus-file> <src-file> <tgt-file> <tgt-sha1> <tgt-size>
   TemporaryFile tmp4;
   std::vector<const char*> args4 = {
     "applypatch",
     "-b",
     bonus_file.c_str(),
     boot_img.c_str(),
     tmp4.path,
     recovery_img_sha1.c_str(),
     recovery_img_size.c_str()
   };
   ASSERT_NE(0, applypatch_modes(args4.size(), args4.data()));

   // Failed to parse patch args.
   TemporaryFile tmp5;
   std::string bad_arg1 =
       "invalid-sha1:filename" + from_testdata_base("recovery-from-boot-with-bonus.p");
   std::vector<const char*> args5 = {
     "applypatch",
     boot_img.c_str(),
     tmp5.path,
     recovery_img_sha1.c_str(),
     recovery_img_size.c_str(),
     bad_arg1.c_str()
   };
   ASSERT_NE(0, applypatch_modes(args5.size(), args5.data()));

   // Target size cannot be zero.
   TemporaryFile tmp6;
   std::string patch = boot_img_sha1 + ":" + from_testdata_base("recovery-from-boot-with-bonus.p");
   std::vector<const char*> args6 = {
     "applypatch",
     boot_img.c_str(),
     tmp6.path,
     recovery_img_sha1.c_str(),
     "0",  // target size
     patch.c_str()
   };
   ASSERT_NE(0, applypatch_modes(args6.size(), args6.data()));
 }

 TEST_F(ApplyPatchModesTest, CheckModeInvalidArgs) {
   // Insufficient args.
   ASSERT_EQ(2, applypatch_modes(2, (const char* []){ "applypatch", "-c" }));
 }

 TEST_F(ApplyPatchModesTest, ShowLicenses) {
   ASSERT_EQ(0, applypatch_modes(2, (const char* []){ "applypatch", "-l" }));
 }

 TEST_F(FreeCacheTest, FreeCacheSmoke) {
   std::vector<std::string> files = { "file1", "file2", "file3" };
   AddFilesToDir(mock_cache.path, files);
   ASSERT_EQ(files, FindFilesInDir(mock_cache.path));
   ASSERT_EQ(4096 * 7, MockFreeSpaceChecker(mock_cache.path));

   ASSERT_TRUE(RemoveFilesInDirectory(4096 * 9, mock_cache.path, [&](const std::string& dir) {
     return this->MockFreeSpaceChecker(dir);
   }));

   ASSERT_EQ(std::vector<std::string>{ "file3" }, FindFilesInDir(mock_cache.path));
   ASSERT_EQ(4096 * 9, MockFreeSpaceChecker(mock_cache.path));
 }

 TEST_F(FreeCacheTest, FreeCacheOpenFile) {
   std::vector<std::string> files = { "file1", "file2" };
   AddFilesToDir(mock_cache.path, files);
   ASSERT_EQ(files, FindFilesInDir(mock_cache.path));
   ASSERT_EQ(4096 * 8, MockFreeSpaceChecker(mock_cache.path));

   std::string file1_path = mock_cache.path + "/file1"s;
   android::base::unique_fd fd(open(file1_path.c_str(), O_RDONLY));

   // file1 can't be deleted as it's opened by us.
   ASSERT_FALSE(RemoveFilesInDirectory(4096 * 10, mock_cache.path, [&](const std::string& dir) {
     return this->MockFreeSpaceChecker(dir);
   }));

   ASSERT_EQ(std::vector<std::string>{ "file1" }, FindFilesInDir(mock_cache.path));
 }

 TEST_F(FreeCacheTest, FreeCacheLogsSmoke) {
   std::vector<std::string> log_files = { "last_log", "last_log.1", "last_kmsg.2", "last_log.5",
                                          "last_log.10" };
   AddFilesToDir(mock_log_dir.path, log_files);
   ASSERT_EQ(4096 * 5, MockFreeSpaceChecker(mock_log_dir.path));

   ASSERT_TRUE(RemoveFilesInDirectory(4096 * 8, mock_log_dir.path, [&](const std::string& dir) {
     return this->MockFreeSpaceChecker(dir);
   }));

   // Logs with a higher index will be deleted first
   std::vector<std::string> expected = { "last_log", "last_log.1" };
   ASSERT_EQ(expected, FindFilesInDir(mock_log_dir.path));
   ASSERT_EQ(4096 * 8, MockFreeSpaceChecker(mock_log_dir.path));
 }

 TEST_F(FreeCacheTest, FreeCacheLogsStringComparison) {
   std::vector<std::string> log_files = { "last_log.1", "last_kmsg.1", "last_log.not_number",
                                          "last_kmsgrandom" };
   AddFilesToDir(mock_log_dir.path, log_files);
   ASSERT_EQ(4096 * 6, MockFreeSpaceChecker(mock_log_dir.path));

   ASSERT_TRUE(RemoveFilesInDirectory(4096 * 9, mock_log_dir.path, [&](const std::string& dir) {
     return this->MockFreeSpaceChecker(dir);
   }));

   // Logs with incorrect format will be deleted first; and the last_kmsg with the same index is
   // deleted before last_log.
   std::vector<std::string> expected = { "last_log.1" };
   ASSERT_EQ(expected, FindFilesInDir(mock_log_dir.path));
   ASSERT_EQ(4096 * 9, MockFreeSpaceChecker(mock_log_dir.path));
 }

 TEST_F(FreeCacheTest, FreeCacheLogsOtherFiles) {
   std::vector<std::string> log_files = { "last_install", "command", "block.map", "last_log",
                                          "last_kmsg.1" };
   AddFilesToDir(mock_log_dir.path, log_files);
   ASSERT_EQ(4096 * 5, MockFreeSpaceChecker(mock_log_dir.path));

   ASSERT_FALSE(RemoveFilesInDirectory(4096 * 8, mock_log_dir.path, [&](const std::string& dir) {
     return this->MockFreeSpaceChecker(dir);
   }));

   // Non log files in /cache/recovery won't be deleted.
   std::vector<std::string> expected = { "block.map", "command", "last_install" };
   ASSERT_EQ(expected, FindFilesInDir(mock_log_dir.path));
 }
	/*
	* Copyright (C) 2016 The Android Open Source Project
	*
	* Licensed under the Apache License, version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agree to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#include <dirent.h>
	#include <fcntl.h>
	#include <gtest/gtest.h>
	#include <libgen.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <sys/stat.h>
	#include <sys/statvfs.h>
	#include <sys/types.h>
	#include <time.h>

	#include <algorithm>
	#include <memory>
	#include <string>
	#include <vector>

	#include <android-base/file.h>
	#include <android-base/logging.h>
	#include <android-base/stringprintf.h>
	#include <android-base/test_utils.h>
	#include <android-base/unique_fd.h>
	#include <bsdiff/bsdiff.h>
	#include <openssl/sha.h>

	#include "applypatch/applypatch.h"
	#include "applypatch/applypatch_modes.h"
	#include "common/test_constants.h"
	#include "otautil/cache_location.h"
	#include "otautil/print_sha1.h"

	using namespace std::string_literals;

	static void sha1sum(const std::string& fname, std::string* sha1, size_t* fsize = nullptr) {
	ASSERT_TRUE(sha1 != nullptr);

	std::string data;
	ASSERT_TRUE(android::base::ReadFileToString(fname, &data));

	if (fsize != nullptr) {
	*fsize = data.size();
	}

	uint8_t digest[SHA_DIGEST_LENGTH];
	SHA1(reinterpret_cast<const uint8_t*>(data.c_str()), data.size(), digest);
	*sha1 = print_sha1(digest);
	}

	static void mangle_file(const std::string& fname) {
	std::string content(1024, '\0');
	for (size_t i = 0; i < 1024; i++) {
	content[i] = rand() % 256;
	}
	ASSERT_TRUE(android::base::WriteStringToFile(content, fname));
	}

	static void test_logger(android::base::LogId /* id */, android::base::LogSeverity severity,
	const char* /* tag /, const char /* file /, unsigned int / line */,
	const char* message) {
	if (severity >= android::base::GetMinimumLogSeverity()) {
	fprintf(stdout, "%s\n", message);
	}
	}

	class ApplyPatchTest : public ::testing::Test {
	public:
	virtual void SetUp() override {
	// set up files
	old_file = from_testdata_base("old.file");
	new_file = from_testdata_base("new.file");
	nonexistent_file = from_testdata_base("nonexistent.file");

	// set up SHA constants
	sha1sum(old_file, &old_sha1, &old_size);
	sha1sum(new_file, &new_sha1, &new_size);
	srand(time(nullptr));
	bad_sha1_a = android::base::StringPrintf("%040x", rand());
	bad_sha1_b = android::base::StringPrintf("%040x", rand());
	}

	std::string old_file;
	std::string new_file;
	std::string nonexistent_file;

	std::string old_sha1;
	std::string new_sha1;
	std::string bad_sha1_a;
	std::string bad_sha1_b;

	size_t old_size;
	size_t new_size;
	};

	class ApplyPatchCacheTest : public ApplyPatchTest {
	protected:
	void SetUp() override {
	ApplyPatchTest::SetUp();
	CacheLocation::location().set_cache_temp_source(old_file);
	}
	};

	class ApplyPatchModesTest : public ::testing::Test {
	protected:
	void SetUp() override {
	CacheLocation::location().set_cache_temp_source(cache_source.path);
	android::base::InitLogging(nullptr, &test_logger);
	android::base::SetMinimumLogSeverity(android::base::LogSeverity::DEBUG);
	}

	TemporaryFile cache_source;
	};

	class FreeCacheTest : public ::testing::Test {
	protected:
	static constexpr size_t PARTITION_SIZE = 4096 * 10;

	// Returns a sorted list of files in \|dirname\|.
	static std::vector<std::string> FindFilesInDir(const std::string& dirname) {
	std::vector<std::string> file_list;

	std::unique_ptr<DIR, decltype(&closedir)> d(opendir(dirname.c_str()), closedir);
	struct dirent* de;
	while ((de = readdir(d.get())) != 0) {
	std::string path = dirname + "/" + de->d_name;

	struct stat st;
	if (stat(path.c_str(), &st) == 0 && S_ISREG(st.st_mode)) {
	file_list.emplace_back(de->d_name);
	}
	}

	std::sort(file_list.begin(), file_list.end());
	return file_list;
	}

	static void AddFilesToDir(const std::string& dir, const std::vector<std::string>& files) {
	std::string zeros(4096, 0);
	for (const auto& file : files) {
	std::string path = dir + "/" + file;
	ASSERT_TRUE(android::base::WriteStringToFile(zeros, path));
	}
	}

	void SetUp() override {
	CacheLocation::location().set_cache_log_directory(mock_log_dir.path);
	}

	// A mock method to calculate the free space. It assumes the partition has a total size of 40960
	// bytes and all files are 4096 bytes in size.
	size_t MockFreeSpaceChecker(const std::string& dirname) {
	std::vector<std::string> files = FindFilesInDir(dirname);
	return PARTITION_SIZE - 4096 * files.size();
	}

	TemporaryDir mock_cache;
	TemporaryDir mock_log_dir;
	};

	TEST_F(ApplyPatchTest, CheckModeSkip) {
	std::vector<std::string> sha1s;
	ASSERT_EQ(0, applypatch_check(&old_file[0], sha1s));
	}

	TEST_F(ApplyPatchTest, CheckModeSingle) {
	std::vector<std::string> sha1s = { old_sha1 };
	ASSERT_EQ(0, applypatch_check(&old_file[0], sha1s));
	}

	TEST_F(ApplyPatchTest, CheckModeMultiple) {
	std::vector<std::string> sha1s = { bad_sha1_a, old_sha1, bad_sha1_b };
	ASSERT_EQ(0, applypatch_check(&old_file[0], sha1s));
	}

	TEST_F(ApplyPatchTest, CheckModeFailure) {
	std::vector<std::string> sha1s = { bad_sha1_a, bad_sha1_b };
	ASSERT_NE(0, applypatch_check(&old_file[0], sha1s));
	}

	TEST_F(ApplyPatchTest, CheckModeEmmcTarget) {
	// EMMC:old_file:size:sha1 should pass the check.
	std::string src_file =
	"EMMC:" + old_file + ":" + std::to_string(old_size) + ":" + old_sha1;
	std::vector<std::string> sha1s;
	ASSERT_EQ(0, applypatch_check(src_file.c_str(), sha1s));

	// EMMC:old_file:(size-1):sha1:(size+1):sha1 should fail the check.
	src_file = "EMMC:" + old_file + ":" + std::to_string(old_size - 1) + ":" + old_sha1 + ":" +
	std::to_string(old_size + 1) + ":" + old_sha1;
	ASSERT_EQ(1, applypatch_check(src_file.c_str(), sha1s));

	// EMMC:old_file:(size-1):sha1:size:sha1:(size+1):sha1 should pass the check.
	src_file = "EMMC:" + old_file + ":" +
	std::to_string(old_size - 1) + ":" + old_sha1 + ":" +
	std::to_string(old_size) + ":" + old_sha1 + ":" +
	std::to_string(old_size + 1) + ":" + old_sha1;
	ASSERT_EQ(0, applypatch_check(src_file.c_str(), sha1s));

	// EMMC:old_file:(size+1):sha1:(size-1):sha1:size:sha1 should pass the check.
	src_file = "EMMC:" + old_file + ":" +
	std::to_string(old_size + 1) + ":" + old_sha1 + ":" +
	std::to_string(old_size - 1) + ":" + old_sha1 + ":" +
	std::to_string(old_size) + ":" + old_sha1;
	ASSERT_EQ(0, applypatch_check(src_file.c_str(), sha1s));

	// EMMC:new_file:(size+1):old_sha1:(size-1):old_sha1:size:old_sha1:size:new_sha1
	// should pass the check.
	src_file = "EMMC:" + new_file + ":" +
	std::to_string(old_size + 1) + ":" + old_sha1 + ":" +
	std::to_string(old_size - 1) + ":" + old_sha1 + ":" +
	std::to_string(old_size) + ":" + old_sha1 + ":" +
	std::to_string(new_size) + ":" + new_sha1;
	ASSERT_EQ(0, applypatch_check(src_file.c_str(), sha1s));
	}

	TEST_F(ApplyPatchCacheTest, CheckCacheCorruptedSourceSingle) {
	TemporaryFile temp_file;
	mangle_file(temp_file.path);
	std::vector<std::string> sha1s_single = { old_sha1 };
	ASSERT_EQ(0, applypatch_check(temp_file.path, sha1s_single));
	ASSERT_EQ(0, applypatch_check(nonexistent_file.c_str(), sha1s_single));
	}

	TEST_F(ApplyPatchCacheTest, CheckCacheCorruptedSourceMultiple) {
	TemporaryFile temp_file;
	mangle_file(temp_file.path);
	std::vector<std::string> sha1s_multiple = { bad_sha1_a, old_sha1, bad_sha1_b };
	ASSERT_EQ(0, applypatch_check(temp_file.path, sha1s_multiple));
	ASSERT_EQ(0, applypatch_check(nonexistent_file.c_str(), sha1s_multiple));
	}

	TEST_F(ApplyPatchCacheTest, CheckCacheCorruptedSourceFailure) {
	TemporaryFile temp_file;
	mangle_file(temp_file.path);
	std::vector<std::string> sha1s_failure = { bad_sha1_a, bad_sha1_b };
	ASSERT_NE(0, applypatch_check(temp_file.path, sha1s_failure));
	ASSERT_NE(0, applypatch_check(nonexistent_file.c_str(), sha1s_failure));
	}

	TEST_F(ApplyPatchModesTest, InvalidArgs) {
	// At least two args (including the filename).
	ASSERT_EQ(2, applypatch_modes(1, (const char* []){ "applypatch" }));

	// Unrecognized args.
	ASSERT_EQ(2, applypatch_modes(2, (const char* []){ "applypatch", "-x" }));
	}

	TEST_F(ApplyPatchModesTest, PatchModeEmmcTarget) {
	std::string boot_img = from_testdata_base("boot.img");
	size_t boot_img_size;
	std::string boot_img_sha1;
	sha1sum(boot_img, &boot_img_sha1, &boot_img_size);

	std::string recovery_img = from_testdata_base("recovery.img");
	size_t recovery_img_size;
	std::string recovery_img_sha1;
	sha1sum(recovery_img, &recovery_img_sha1, &recovery_img_size);
	std::string recovery_img_size_arg = std::to_string(recovery_img_size);

	std::string bonus_file = from_testdata_base("bonus.file");

	// applypatch -b <bonus-file> <src-file> <tgt-file> <tgt-sha1> <tgt-size> <src-sha1>:<patch>
	std::string src_file_arg =
	"EMMC:" + boot_img + ":" + std::to_string(boot_img_size) + ":" + boot_img_sha1;
	TemporaryFile tgt_file;
	std::string tgt_file_arg = "EMMC:"s + tgt_file.path;
	std::string patch_arg = boot_img_sha1 + ":" + from_testdata_base("recovery-from-boot.p");
	std::vector<const char*> args = { "applypatch",
	"-b",
	bonus_file.c_str(),
	src_file_arg.c_str(),
	tgt_file_arg.c_str(),
	recovery_img_sha1.c_str(),
	recovery_img_size_arg.c_str(),
	patch_arg.c_str() };
	ASSERT_EQ(0, applypatch_modes(args.size(), args.data()));
	}

	// Tests patching the EMMC target without a separate bonus file (i.e. recovery-from-boot patch has
	// everything).
	TEST_F(ApplyPatchModesTest, PatchModeEmmcTargetWithoutBonusFile) {
	std::string boot_img = from_testdata_base("boot.img");
	size_t boot_img_size;
	std::string boot_img_sha1;
	sha1sum(boot_img, &boot_img_sha1, &boot_img_size);

	std::string recovery_img = from_testdata_base("recovery.img");
	size_t recovery_img_size;
	std::string recovery_img_sha1;
	sha1sum(recovery_img, &recovery_img_sha1, &recovery_img_size);
	std::string recovery_img_size_arg = std::to_string(recovery_img_size);

	// applypatch <src-file> <tgt-file> <tgt-sha1> <tgt-size> <src-sha1>:<patch>
	std::string src_file_arg =
	"EMMC:" + boot_img + ":" + std::to_string(boot_img_size) + ":" + boot_img_sha1;
	TemporaryFile tgt_file;
	std::string tgt_file_arg = "EMMC:"s + tgt_file.path;
	std::string patch_arg =
	boot_img_sha1 + ":" + from_testdata_base("recovery-from-boot-with-bonus.p");
	std::vector<const char*> args = { "applypatch",
	src_file_arg.c_str(),
	tgt_file_arg.c_str(),
	recovery_img_sha1.c_str(),
	recovery_img_size_arg.c_str(),
	patch_arg.c_str() };
	ASSERT_EQ(0, applypatch_modes(args.size(), args.data()));
	}

	TEST_F(ApplyPatchModesTest, PatchModeEmmcTargetWithMultiplePatches) {
	std::string boot_img = from_testdata_base("boot.img");
	size_t boot_img_size;
	std::string boot_img_sha1;
	sha1sum(boot_img, &boot_img_sha1, &boot_img_size);

	std::string recovery_img = from_testdata_base("recovery.img");
	size_t recovery_img_size;
	std::string recovery_img_sha1;
	sha1sum(recovery_img, &recovery_img_sha1, &recovery_img_size);
	std::string recovery_img_size_arg = std::to_string(recovery_img_size);

	std::string bonus_file = from_testdata_base("bonus.file");

	// applypatch -b <bonus-file> <src-file> <tgt-file> <tgt-sha1> <tgt-size> \
	// <src-sha1-fake1>:<patch1> <src-sha1>:<patch2> <src-sha1-fake2>:<patch3>
	std::string src_file_arg =
	"EMMC:" + boot_img + ":" + std::to_string(boot_img_size) + ":" + boot_img_sha1;
	TemporaryFile tgt_file;
	std::string tgt_file_arg = "EMMC:"s + tgt_file.path;
	std::string bad_sha1_a = android::base::StringPrintf("%040x", rand());
	std::string bad_sha1_b = android::base::StringPrintf("%040x", rand());
	std::string patch1 = bad_sha1_a + ":" + from_testdata_base("recovery-from-boot.p");
	std::string patch2 = boot_img_sha1 + ":" + from_testdata_base("recovery-from-boot.p");
	std::string patch3 = bad_sha1_b + ":" + from_testdata_base("recovery-from-boot.p");
	std::vector<const char*> args = { "applypatch",
	"-b",
	bonus_file.c_str(),
	src_file_arg.c_str(),
	tgt_file_arg.c_str(),
	recovery_img_sha1.c_str(),
	recovery_img_size_arg.c_str(),
	patch1.c_str(),
	patch2.c_str(),
	patch3.c_str() };
	// TODO(b/67849209): Remove after addressing the flakiness.
	printf("Calling applypatch_modes with the following args:\n");
	for (const auto& arg : args) {
	printf(" %s\n", arg);
	}
	ASSERT_EQ(0, applypatch_modes(args.size(), args.data()));
	}

	// Ensures that applypatch works with a bsdiff based recovery-from-boot.p.
	TEST_F(ApplyPatchModesTest, PatchModeEmmcTargetWithBsdiffPatch) {
	std::string boot_img_file = from_testdata_base("boot.img");
	std::string boot_img_sha1;
	size_t boot_img_size;
	sha1sum(boot_img_file, &boot_img_sha1, &boot_img_size);

	std::string recovery_img_file = from_testdata_base("recovery.img");
	std::string recovery_img_sha1;
	size_t recovery_img_size;
	sha1sum(recovery_img_file, &recovery_img_sha1, &recovery_img_size);

	// Generate the bsdiff patch of recovery-from-boot.p.
	std::string src_content;
	ASSERT_TRUE(android::base::ReadFileToString(boot_img_file, &src_content));

	std::string tgt_content;
	ASSERT_TRUE(android::base::ReadFileToString(recovery_img_file, &tgt_content));

	TemporaryFile patch_file;
	ASSERT_EQ(0,
	bsdiff::bsdiff(reinterpret_cast<const uint8_t*>(src_content.data()), src_content.size(),
	reinterpret_cast<const uint8_t*>(tgt_content.data()), tgt_content.size(),
	patch_file.path, nullptr));

	// applypatch <src-file> <tgt-file> <tgt-sha1> <tgt-size> <src-sha1>:<patch>
	std::string src_file_arg =
	"EMMC:" + boot_img_file + ":" + std::to_string(boot_img_size) + ":" + boot_img_sha1;
	TemporaryFile tgt_file;
	std::string tgt_file_arg = "EMMC:"s + tgt_file.path;
	std::string recovery_img_size_arg = std::to_string(recovery_img_size);
	std::string patch_arg = boot_img_sha1 + ":" + patch_file.path;
	std::vector<const char*> args = { "applypatch",
	src_file_arg.c_str(),
	tgt_file_arg.c_str(),
	recovery_img_sha1.c_str(),
	recovery_img_size_arg.c_str(),
	patch_arg.c_str() };
	ASSERT_EQ(0, applypatch_modes(args.size(), args.data()));

	// Double check the patched recovery image.
	std::string tgt_file_sha1;
	size_t tgt_file_size;
	sha1sum(tgt_file.path, &tgt_file_sha1, &tgt_file_size);
	ASSERT_EQ(recovery_img_size, tgt_file_size);
	ASSERT_EQ(recovery_img_sha1, tgt_file_sha1);
	}

	TEST_F(ApplyPatchModesTest, PatchModeInvalidArgs) {
	// Invalid bonus file.
	ASSERT_NE(0, applypatch_modes(3, (const char* []){ "applypatch", "-b", "/doesntexist" }));

	std::string bonus_file = from_testdata_base("bonus.file");
	// With bonus file, but missing args.
	ASSERT_EQ(2, applypatch_modes(3, (const char* []){ "applypatch", "-b", bonus_file.c_str() }));

	std::string boot_img = from_testdata_base("boot.img");
	size_t boot_img_size;
	std::string boot_img_sha1;
	sha1sum(boot_img, &boot_img_sha1, &boot_img_size);

	std::string recovery_img = from_testdata_base("recovery.img");
	size_t size;
	std::string recovery_img_sha1;
	sha1sum(recovery_img, &recovery_img_sha1, &size);
	std::string recovery_img_size = std::to_string(size);

	// Bonus file is not supported in flash mode.
	// applypatch -b <bonus-file> <src-file> <tgt-file> <tgt-sha1> <tgt-size>
	TemporaryFile tmp4;
	std::vector<const char*> args4 = {
	"applypatch",
	"-b",
	bonus_file.c_str(),
	boot_img.c_str(),
	tmp4.path,
	recovery_img_sha1.c_str(),
	recovery_img_size.c_str()
	};
	ASSERT_NE(0, applypatch_modes(args4.size(), args4.data()));

	// Failed to parse patch args.
	TemporaryFile tmp5;
	std::string bad_arg1 =
	"invalid-sha1:filename" + from_testdata_base("recovery-from-boot-with-bonus.p");
	std::vector<const char*> args5 = {
	"applypatch",
	boot_img.c_str(),
	tmp5.path,
	recovery_img_sha1.c_str(),
	recovery_img_size.c_str(),
	bad_arg1.c_str()
	};
	ASSERT_NE(0, applypatch_modes(args5.size(), args5.data()));

	// Target size cannot be zero.
	TemporaryFile tmp6;
	std::string patch = boot_img_sha1 + ":" + from_testdata_base("recovery-from-boot-with-bonus.p");
	std::vector<const char*> args6 = {
	"applypatch",
	boot_img.c_str(),
	tmp6.path,
	recovery_img_sha1.c_str(),
	"0", // target size
	patch.c_str()
	};
	ASSERT_NE(0, applypatch_modes(args6.size(), args6.data()));
	}

	TEST_F(ApplyPatchModesTest, CheckModeInvalidArgs) {
	// Insufficient args.
	ASSERT_EQ(2, applypatch_modes(2, (const char* []){ "applypatch", "-c" }));
	}

	TEST_F(ApplyPatchModesTest, ShowLicenses) {
	ASSERT_EQ(0, applypatch_modes(2, (const char* []){ "applypatch", "-l" }));
	}

	TEST_F(FreeCacheTest, FreeCacheSmoke) {
	std::vector<std::string> files = { "file1", "file2", "file3" };
	AddFilesToDir(mock_cache.path, files);
	ASSERT_EQ(files, FindFilesInDir(mock_cache.path));
	ASSERT_EQ(4096 * 7, MockFreeSpaceChecker(mock_cache.path));

	ASSERT_TRUE(RemoveFilesInDirectory(4096 * 9, mock_cache.path, [&](const std::string& dir) {
	return this->MockFreeSpaceChecker(dir);
	}));

	ASSERT_EQ(std::vector<std::string>{ "file3" }, FindFilesInDir(mock_cache.path));
	ASSERT_EQ(4096 * 9, MockFreeSpaceChecker(mock_cache.path));
	}

	TEST_F(FreeCacheTest, FreeCacheOpenFile) {
	std::vector<std::string> files = { "file1", "file2" };
	AddFilesToDir(mock_cache.path, files);
	ASSERT_EQ(files, FindFilesInDir(mock_cache.path));
	ASSERT_EQ(4096 * 8, MockFreeSpaceChecker(mock_cache.path));

	std::string file1_path = mock_cache.path + "/file1"s;
	android::base::unique_fd fd(open(file1_path.c_str(), O_RDONLY));

	// file1 can't be deleted as it's opened by us.
	ASSERT_FALSE(RemoveFilesInDirectory(4096 * 10, mock_cache.path, [&](const std::string& dir) {
	return this->MockFreeSpaceChecker(dir);
	}));

	ASSERT_EQ(std::vector<std::string>{ "file1" }, FindFilesInDir(mock_cache.path));
	}

	TEST_F(FreeCacheTest, FreeCacheLogsSmoke) {
	std::vector<std::string> log_files = { "last_log", "last_log.1", "last_kmsg.2", "last_log.5",
	"last_log.10" };
	AddFilesToDir(mock_log_dir.path, log_files);
	ASSERT_EQ(4096 * 5, MockFreeSpaceChecker(mock_log_dir.path));

	ASSERT_TRUE(RemoveFilesInDirectory(4096 * 8, mock_log_dir.path, [&](const std::string& dir) {
	return this->MockFreeSpaceChecker(dir);
	}));

	// Logs with a higher index will be deleted first
	std::vector<std::string> expected = { "last_log", "last_log.1" };
	ASSERT_EQ(expected, FindFilesInDir(mock_log_dir.path));
	ASSERT_EQ(4096 * 8, MockFreeSpaceChecker(mock_log_dir.path));
	}

	TEST_F(FreeCacheTest, FreeCacheLogsStringComparison) {
	std::vector<std::string> log_files = { "last_log.1", "last_kmsg.1", "last_log.not_number",
	"last_kmsgrandom" };
	AddFilesToDir(mock_log_dir.path, log_files);
	ASSERT_EQ(4096 * 6, MockFreeSpaceChecker(mock_log_dir.path));

	ASSERT_TRUE(RemoveFilesInDirectory(4096 * 9, mock_log_dir.path, [&](const std::string& dir) {
	return this->MockFreeSpaceChecker(dir);
	}));

	// Logs with incorrect format will be deleted first; and the last_kmsg with the same index is
	// deleted before last_log.
	std::vector<std::string> expected = { "last_log.1" };
	ASSERT_EQ(expected, FindFilesInDir(mock_log_dir.path));
	ASSERT_EQ(4096 * 9, MockFreeSpaceChecker(mock_log_dir.path));
	}

	TEST_F(FreeCacheTest, FreeCacheLogsOtherFiles) {
	std::vector<std::string> log_files = { "last_install", "command", "block.map", "last_log",
	"last_kmsg.1" };
	AddFilesToDir(mock_log_dir.path, log_files);
	ASSERT_EQ(4096 * 5, MockFreeSpaceChecker(mock_log_dir.path));

	ASSERT_FALSE(RemoveFilesInDirectory(4096 * 8, mock_log_dir.path, [&](const std::string& dir) {
	return this->MockFreeSpaceChecker(dir);
	}));

	// Non log files in /cache/recovery won't be deleted.
	std::vector<std::string> expected = { "block.map", "command", "last_install" };
	ASSERT_EQ(expected, FindFilesInDir(mock_log_dir.path));
	}