common/test_utils.cc - android_system_update_engine - Gitiles

 //
 // Copyright (C) 2012 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 agreed 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 "update_engine/common/test_utils.h"

 #include <dirent.h>
 #include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <sys/xattr.h>
 #include <unistd.h>

 #include <set>
 #include <string>
 #include <vector>

 #include <base/files/file_util.h>
 #include <base/format_macros.h>
 #include <base/logging.h>
 #include <base/strings/string_util.h>
 #include <base/strings/stringprintf.h>

 #include "update_engine/common/error_code_utils.h"
 #include "update_engine/common/utils.h"
 #include "update_engine/payload_consumer/file_writer.h"

 using base::StringPrintf;
 using std::set;
 using std::string;
 using std::vector;

 namespace chromeos_update_engine {

 void PrintTo(const Extent& extent, ::std::ostream* os) {
   *os << "(" << extent.start_block() << ", " << extent.num_blocks() << ")";
 }

 void PrintTo(const ErrorCode& error_code, ::std::ostream* os) {
   *os << utils::ErrorCodeToString(error_code);
 }

 namespace test_utils {

 const char* const kMountPathTemplate = "UpdateEngineTests_mnt-XXXXXX";

 const uint8_t kRandomString[] = {
   0xf2, 0xb7, 0x55, 0x92, 0xea, 0xa6, 0xc9, 0x57,
   0xe0, 0xf8, 0xeb, 0x34, 0x93, 0xd9, 0xc4, 0x8f,
   0xcb, 0x20, 0xfa, 0x37, 0x4b, 0x40, 0xcf, 0xdc,
   0xa5, 0x08, 0x70, 0x89, 0x79, 0x35, 0xe2, 0x3d,
   0x56, 0xa4, 0x75, 0x73, 0xa3, 0x6d, 0xd1, 0xd5,
   0x26, 0xbb, 0x9c, 0x60, 0xbd, 0x2f, 0x5a, 0xfa,
   0xb7, 0xd4, 0x3a, 0x50, 0xa7, 0x6b, 0x3e, 0xfd,
   0x61, 0x2b, 0x3a, 0x31, 0x30, 0x13, 0x33, 0x53,
   0xdb, 0xd0, 0x32, 0x71, 0x5c, 0x39, 0xed, 0xda,
   0xb4, 0x84, 0xca, 0xbc, 0xbd, 0x78, 0x1c, 0x0c,
   0xd8, 0x0b, 0x41, 0xe8, 0xe1, 0xe0, 0x41, 0xad,
   0x03, 0x12, 0xd3, 0x3d, 0xb8, 0x75, 0x9b, 0xe6,
   0xd9, 0x01, 0xd0, 0x87, 0xf4, 0x36, 0xfa, 0xa7,
   0x0a, 0xfa, 0xc5, 0x87, 0x65, 0xab, 0x9a, 0x7b,
   0xeb, 0x58, 0x23, 0xf0, 0xa8, 0x0a, 0xf2, 0x33,
   0x3a, 0xe2, 0xe3, 0x35, 0x74, 0x95, 0xdd, 0x3c,
   0x59, 0x5a, 0xd9, 0x52, 0x3a, 0x3c, 0xac, 0xe5,
   0x15, 0x87, 0x6d, 0x82, 0xbc, 0xf8, 0x7d, 0xbe,
   0xca, 0xd3, 0x2c, 0xd6, 0xec, 0x38, 0xeb, 0xe4,
   0x53, 0xb0, 0x4c, 0x3f, 0x39, 0x29, 0xf7, 0xa4,
   0x73, 0xa8, 0xcb, 0x32, 0x50, 0x05, 0x8c, 0x1c,
   0x1c, 0xca, 0xc9, 0x76, 0x0b, 0x8f, 0x6b, 0x57,
   0x1f, 0x24, 0x2b, 0xba, 0x82, 0xba, 0xed, 0x58,
   0xd8, 0xbf, 0xec, 0x06, 0x64, 0x52, 0x6a, 0x3f,
   0xe4, 0xad, 0xce, 0x84, 0xb4, 0x27, 0x55, 0x14,
   0xe3, 0x75, 0x59, 0x73, 0x71, 0x51, 0xea, 0xe8,
   0xcc, 0xda, 0x4f, 0x09, 0xaf, 0xa4, 0xbc, 0x0e,
   0xa6, 0x1f, 0xe2, 0x3a, 0xf8, 0x96, 0x7d, 0x30,
   0x23, 0xc5, 0x12, 0xb5, 0xd8, 0x73, 0x6b, 0x71,
   0xab, 0xf1, 0xd7, 0x43, 0x58, 0xa7, 0xc9, 0xf0,
   0xe4, 0x85, 0x1c, 0xd6, 0x92, 0x50, 0x2c, 0x98,
   0x36, 0xfe, 0x87, 0xaf, 0x43, 0x8f, 0x8f, 0xf5,
   0x88, 0x48, 0x18, 0x42, 0xcf, 0x42, 0xc1, 0xa8,
   0xe8, 0x05, 0x08, 0xa1, 0x45, 0x70, 0x5b, 0x8c,
   0x39, 0x28, 0xab, 0xe9, 0x6b, 0x51, 0xd2, 0xcb,
   0x30, 0x04, 0xea, 0x7d, 0x2f, 0x6e, 0x6c, 0x3b,
   0x5f, 0x82, 0xd9, 0x5b, 0x89, 0x37, 0x65, 0x65,
   0xbe, 0x9f, 0xa3, 0x5d,
 };

 bool IsXAttrSupported(const base::FilePath& dir_path) {
   char *path = strdup(dir_path.Append("xattr_test_XXXXXX").value().c_str());

   int fd = mkstemp(path);
   if (fd == -1) {
     PLOG(ERROR) << "Error creating temporary file in " << dir_path.value();
     free(path);
     return false;
   }

   if (unlink(path) != 0) {
     PLOG(ERROR) << "Error unlinking temporary file " << path;
     close(fd);
     free(path);
     return false;
   }

   int xattr_res = fsetxattr(fd, "user.xattr-test", "value", strlen("value"), 0);
   if (xattr_res != 0) {
     if (errno == ENOTSUP) {
       // Leave it to call-sites to warn about non-support.
     } else {
       PLOG(ERROR) << "Error setting xattr on " << path;
     }
   }
   close(fd);
   free(path);
   return xattr_res == 0;
 }

 bool WriteFileVector(const string& path, const brillo::Blob& data) {
   return utils::WriteFile(path.c_str(), data.data(), data.size());
 }

 bool WriteFileString(const string& path, const string& data) {
   return utils::WriteFile(path.c_str(), data.data(), data.size());
 }

 // Binds provided |filename| to an unused loopback device, whose name is written
 // to the string pointed to by |lo_dev_name_p|. Returns true on success, false
 // otherwise (along with corresponding test failures), in which case the content
 // of |lo_dev_name_p| is unknown.
 bool BindToUnusedLoopDevice(const string& filename, string* lo_dev_name_p) {
   CHECK(lo_dev_name_p);

   // Bind to an unused loopback device, sanity check the device name.
   lo_dev_name_p->clear();
   if (!(utils::ReadPipe("losetup --show -f " + filename, lo_dev_name_p) &&
         base::StartsWith(*lo_dev_name_p, "/dev/loop",
                          base::CompareCase::SENSITIVE))) {
     ADD_FAILURE();
     return false;
   }

   // Strip anything from the first newline char.
   size_t newline_pos = lo_dev_name_p->find('\n');
   if (newline_pos != string::npos)
     lo_dev_name_p->erase(newline_pos);

   return true;
 }

 bool ExpectVectorsEq(const brillo::Blob& expected,
                      const brillo::Blob& actual) {
   EXPECT_EQ(expected.size(), actual.size());
   if (expected.size() != actual.size())
     return false;
   bool is_all_eq = true;
   for (unsigned int i = 0; i < expected.size(); i++) {
     EXPECT_EQ(expected[i], actual[i]) << "offset: " << i;
     is_all_eq = is_all_eq && (expected[i] == actual[i]);
   }
   return is_all_eq;
 }

 void FillWithData(brillo::Blob* buffer) {
   size_t input_counter = 0;
   for (uint8_t& b : *buffer) {
     b = kRandomString[input_counter];
     input_counter++;
     input_counter %= sizeof(kRandomString);
   }
 }

 void CreateEmptyExtImageAtPath(const string& path,
                                size_t size,
                                int block_size) {
   EXPECT_EQ(0, System(StringPrintf("dd if=/dev/zero of=%s"
                                    " seek=%" PRIuS " bs=1 count=1 status=none",
                                    path.c_str(), size)));
   EXPECT_EQ(0, System(StringPrintf("mkfs.ext3 -q -b %d -F %s",
                                    block_size, path.c_str())));
 }

 void CreateExtImageAtPath(const string& path, vector<string>* out_paths) {
   // create 10MiB sparse file, mounted at a unique location.
   string mount_path;
   CHECK(utils::MakeTempDirectory(kMountPathTemplate, &mount_path));
   ScopedDirRemover mount_path_unlinker(mount_path);

   EXPECT_EQ(0, System(StringPrintf("dd if=/dev/zero of=%s"
                                    " seek=10485759 bs=1 count=1 status=none",
                                    path.c_str())));
   EXPECT_EQ(0, System(StringPrintf("mkfs.ext3 -q -b 4096 -F %s",
                                    path.c_str())));
   EXPECT_EQ(0, System(StringPrintf("mount -o loop %s %s", path.c_str(),
                                    mount_path.c_str())));
   EXPECT_EQ(0, System(StringPrintf("echo hi > %s/hi", mount_path.c_str())));
   EXPECT_EQ(0, System(StringPrintf("echo hello > %s/hello",
                                    mount_path.c_str())));
   EXPECT_EQ(0, System(StringPrintf("mkdir %s/some_dir", mount_path.c_str())));
   EXPECT_EQ(0, System(StringPrintf("mkdir %s/some_dir/empty_dir",
                                    mount_path.c_str())));
   EXPECT_EQ(0, System(StringPrintf("mkdir %s/some_dir/mnt",
                                    mount_path.c_str())));
   EXPECT_EQ(0, System(StringPrintf("echo T > %s/some_dir/test",
                                    mount_path.c_str())));
   EXPECT_EQ(0, System(StringPrintf("mkfifo %s/some_dir/fifo",
                                    mount_path.c_str())));
   EXPECT_EQ(0, System(StringPrintf("mknod %s/cdev c 2 3", mount_path.c_str())));
   EXPECT_EQ(0, System(StringPrintf("ln -s /some/target %s/sym",
                                    mount_path.c_str())));
   EXPECT_EQ(0, System(StringPrintf("ln %s/some_dir/test %s/testlink",
                                    mount_path.c_str(), mount_path.c_str())));
   EXPECT_EQ(0, System(StringPrintf("echo T > %s/srchardlink0",
                                    mount_path.c_str())));
   EXPECT_EQ(0, System(StringPrintf("ln %s/srchardlink0 %s/srchardlink1",
                                    mount_path.c_str(), mount_path.c_str())));
   EXPECT_EQ(0, System(StringPrintf("ln -s bogus %s/boguslink",
                                    mount_path.c_str())));
   EXPECT_TRUE(utils::UnmountFilesystem(mount_path.c_str()));

   if (out_paths) {
     out_paths->clear();
     out_paths->push_back("");
     out_paths->push_back("/hi");
     out_paths->push_back("/boguslink");
     out_paths->push_back("/hello");
     out_paths->push_back("/some_dir");
     out_paths->push_back("/some_dir/empty_dir");
     out_paths->push_back("/some_dir/mnt");
     out_paths->push_back("/some_dir/test");
     out_paths->push_back("/some_dir/fifo");
     out_paths->push_back("/cdev");
     out_paths->push_back("/testlink");
     out_paths->push_back("/sym");
     out_paths->push_back("/srchardlink0");
     out_paths->push_back("/srchardlink1");
     out_paths->push_back("/lost+found");
   }
 }

 ScopedLoopMounter::ScopedLoopMounter(const string& file_path,
                                      string* mnt_path,
                                      unsigned long flags) {  // NOLINT - long
   EXPECT_TRUE(utils::MakeTempDirectory("mnt.XXXXXX", mnt_path));
   dir_remover_.reset(new ScopedDirRemover(*mnt_path));

   string loop_dev;
   loop_binder_.reset(new ScopedLoopbackDeviceBinder(file_path, &loop_dev));

   EXPECT_TRUE(utils::MountFilesystem(loop_dev, *mnt_path, flags));
   unmounter_.reset(new ScopedFilesystemUnmounter(*mnt_path));
 }

 base::FilePath GetBuildArtifactsPath() {
   base::FilePath exe_path;
   base::ReadSymbolicLink(base::FilePath("/proc/self/exe"), &exe_path);
   return exe_path.DirName();
 }

 }  // namespace test_utils
 }  // namespace chromeos_update_engine
	//
	// Copyright (C) 2012 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 agreed 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 "update_engine/common/test_utils.h"

	#include <dirent.h>
	#include <errno.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <sys/stat.h>
	#include <sys/types.h>
	#include <sys/xattr.h>
	#include <unistd.h>

	#include <set>
	#include <string>
	#include <vector>

	#include <base/files/file_util.h>
	#include <base/format_macros.h>
	#include <base/logging.h>
	#include <base/strings/string_util.h>
	#include <base/strings/stringprintf.h>

	#include "update_engine/common/error_code_utils.h"
	#include "update_engine/common/utils.h"
	#include "update_engine/payload_consumer/file_writer.h"

	using base::StringPrintf;
	using std::set;
	using std::string;
	using std::vector;

	namespace chromeos_update_engine {

	void PrintTo(const Extent& extent, ::std::ostream* os) {
	*os << "(" << extent.start_block() << ", " << extent.num_blocks() << ")";
	}

	void PrintTo(const ErrorCode& error_code, ::std::ostream* os) {
	*os << utils::ErrorCodeToString(error_code);
	}

	namespace test_utils {

	const char* const kMountPathTemplate = "UpdateEngineTests_mnt-XXXXXX";

	const uint8_t kRandomString[] = {
	0xf2, 0xb7, 0x55, 0x92, 0xea, 0xa6, 0xc9, 0x57,
	0xe0, 0xf8, 0xeb, 0x34, 0x93, 0xd9, 0xc4, 0x8f,
	0xcb, 0x20, 0xfa, 0x37, 0x4b, 0x40, 0xcf, 0xdc,
	0xa5, 0x08, 0x70, 0x89, 0x79, 0x35, 0xe2, 0x3d,
	0x56, 0xa4, 0x75, 0x73, 0xa3, 0x6d, 0xd1, 0xd5,
	0x26, 0xbb, 0x9c, 0x60, 0xbd, 0x2f, 0x5a, 0xfa,
	0xb7, 0xd4, 0x3a, 0x50, 0xa7, 0x6b, 0x3e, 0xfd,
	0x61, 0x2b, 0x3a, 0x31, 0x30, 0x13, 0x33, 0x53,
	0xdb, 0xd0, 0x32, 0x71, 0x5c, 0x39, 0xed, 0xda,
	0xb4, 0x84, 0xca, 0xbc, 0xbd, 0x78, 0x1c, 0x0c,
	0xd8, 0x0b, 0x41, 0xe8, 0xe1, 0xe0, 0x41, 0xad,
	0x03, 0x12, 0xd3, 0x3d, 0xb8, 0x75, 0x9b, 0xe6,
	0xd9, 0x01, 0xd0, 0x87, 0xf4, 0x36, 0xfa, 0xa7,
	0x0a, 0xfa, 0xc5, 0x87, 0x65, 0xab, 0x9a, 0x7b,
	0xeb, 0x58, 0x23, 0xf0, 0xa8, 0x0a, 0xf2, 0x33,
	0x3a, 0xe2, 0xe3, 0x35, 0x74, 0x95, 0xdd, 0x3c,
	0x59, 0x5a, 0xd9, 0x52, 0x3a, 0x3c, 0xac, 0xe5,
	0x15, 0x87, 0x6d, 0x82, 0xbc, 0xf8, 0x7d, 0xbe,
	0xca, 0xd3, 0x2c, 0xd6, 0xec, 0x38, 0xeb, 0xe4,
	0x53, 0xb0, 0x4c, 0x3f, 0x39, 0x29, 0xf7, 0xa4,
	0x73, 0xa8, 0xcb, 0x32, 0x50, 0x05, 0x8c, 0x1c,
	0x1c, 0xca, 0xc9, 0x76, 0x0b, 0x8f, 0x6b, 0x57,
	0x1f, 0x24, 0x2b, 0xba, 0x82, 0xba, 0xed, 0x58,
	0xd8, 0xbf, 0xec, 0x06, 0x64, 0x52, 0x6a, 0x3f,
	0xe4, 0xad, 0xce, 0x84, 0xb4, 0x27, 0x55, 0x14,
	0xe3, 0x75, 0x59, 0x73, 0x71, 0x51, 0xea, 0xe8,
	0xcc, 0xda, 0x4f, 0x09, 0xaf, 0xa4, 0xbc, 0x0e,
	0xa6, 0x1f, 0xe2, 0x3a, 0xf8, 0x96, 0x7d, 0x30,
	0x23, 0xc5, 0x12, 0xb5, 0xd8, 0x73, 0x6b, 0x71,
	0xab, 0xf1, 0xd7, 0x43, 0x58, 0xa7, 0xc9, 0xf0,
	0xe4, 0x85, 0x1c, 0xd6, 0x92, 0x50, 0x2c, 0x98,
	0x36, 0xfe, 0x87, 0xaf, 0x43, 0x8f, 0x8f, 0xf5,
	0x88, 0x48, 0x18, 0x42, 0xcf, 0x42, 0xc1, 0xa8,
	0xe8, 0x05, 0x08, 0xa1, 0x45, 0x70, 0x5b, 0x8c,
	0x39, 0x28, 0xab, 0xe9, 0x6b, 0x51, 0xd2, 0xcb,
	0x30, 0x04, 0xea, 0x7d, 0x2f, 0x6e, 0x6c, 0x3b,
	0x5f, 0x82, 0xd9, 0x5b, 0x89, 0x37, 0x65, 0x65,
	0xbe, 0x9f, 0xa3, 0x5d,
	};

	bool IsXAttrSupported(const base::FilePath& dir_path) {
	char *path = strdup(dir_path.Append("xattr_test_XXXXXX").value().c_str());

	int fd = mkstemp(path);
	if (fd == -1) {
	PLOG(ERROR) << "Error creating temporary file in " << dir_path.value();
	free(path);
	return false;
	}

	if (unlink(path) != 0) {
	PLOG(ERROR) << "Error unlinking temporary file " << path;
	close(fd);
	free(path);
	return false;
	}

	int xattr_res = fsetxattr(fd, "user.xattr-test", "value", strlen("value"), 0);
	if (xattr_res != 0) {
	if (errno == ENOTSUP) {
	// Leave it to call-sites to warn about non-support.
	} else {
	PLOG(ERROR) << "Error setting xattr on " << path;
	}
	}
	close(fd);
	free(path);
	return xattr_res == 0;
	}

	bool WriteFileVector(const string& path, const brillo::Blob& data) {
	return utils::WriteFile(path.c_str(), data.data(), data.size());
	}

	bool WriteFileString(const string& path, const string& data) {
	return utils::WriteFile(path.c_str(), data.data(), data.size());
	}

	// Binds provided \|filename\| to an unused loopback device, whose name is written
	// to the string pointed to by \|lo_dev_name_p\|. Returns true on success, false
	// otherwise (along with corresponding test failures), in which case the content
	// of \|lo_dev_name_p\| is unknown.
	bool BindToUnusedLoopDevice(const string& filename, string* lo_dev_name_p) {
	CHECK(lo_dev_name_p);

	// Bind to an unused loopback device, sanity check the device name.
	lo_dev_name_p->clear();
	if (!(utils::ReadPipe("losetup --show -f " + filename, lo_dev_name_p) &&
	base::StartsWith(*lo_dev_name_p, "/dev/loop",
	base::CompareCase::SENSITIVE))) {
	ADD_FAILURE();
	return false;
	}

	// Strip anything from the first newline char.
	size_t newline_pos = lo_dev_name_p->find('\n');
	if (newline_pos != string::npos)
	lo_dev_name_p->erase(newline_pos);

	return true;
	}

	bool ExpectVectorsEq(const brillo::Blob& expected,
	const brillo::Blob& actual) {
	EXPECT_EQ(expected.size(), actual.size());
	if (expected.size() != actual.size())
	return false;
	bool is_all_eq = true;
	for (unsigned int i = 0; i < expected.size(); i++) {
	EXPECT_EQ(expected[i], actual[i]) << "offset: " << i;
	is_all_eq = is_all_eq && (expected[i] == actual[i]);
	}
	return is_all_eq;
	}

	void FillWithData(brillo::Blob* buffer) {
	size_t input_counter = 0;
	for (uint8_t& b : *buffer) {
	b = kRandomString[input_counter];
	input_counter++;
	input_counter %= sizeof(kRandomString);
	}
	}

	void CreateEmptyExtImageAtPath(const string& path,
	size_t size,
	int block_size) {
	EXPECT_EQ(0, System(StringPrintf("dd if=/dev/zero of=%s"
	" seek=%" PRIuS " bs=1 count=1 status=none",
	path.c_str(), size)));
	EXPECT_EQ(0, System(StringPrintf("mkfs.ext3 -q -b %d -F %s",
	block_size, path.c_str())));
	}

	void CreateExtImageAtPath(const string& path, vector<string>* out_paths) {
	// create 10MiB sparse file, mounted at a unique location.
	string mount_path;
	CHECK(utils::MakeTempDirectory(kMountPathTemplate, &mount_path));
	ScopedDirRemover mount_path_unlinker(mount_path);

	EXPECT_EQ(0, System(StringPrintf("dd if=/dev/zero of=%s"
	" seek=10485759 bs=1 count=1 status=none",
	path.c_str())));
	EXPECT_EQ(0, System(StringPrintf("mkfs.ext3 -q -b 4096 -F %s",
	path.c_str())));
	EXPECT_EQ(0, System(StringPrintf("mount -o loop %s %s", path.c_str(),
	mount_path.c_str())));
	EXPECT_EQ(0, System(StringPrintf("echo hi > %s/hi", mount_path.c_str())));
	EXPECT_EQ(0, System(StringPrintf("echo hello > %s/hello",
	mount_path.c_str())));
	EXPECT_EQ(0, System(StringPrintf("mkdir %s/some_dir", mount_path.c_str())));
	EXPECT_EQ(0, System(StringPrintf("mkdir %s/some_dir/empty_dir",
	mount_path.c_str())));
	EXPECT_EQ(0, System(StringPrintf("mkdir %s/some_dir/mnt",
	mount_path.c_str())));
	EXPECT_EQ(0, System(StringPrintf("echo T > %s/some_dir/test",
	mount_path.c_str())));
	EXPECT_EQ(0, System(StringPrintf("mkfifo %s/some_dir/fifo",
	mount_path.c_str())));
	EXPECT_EQ(0, System(StringPrintf("mknod %s/cdev c 2 3", mount_path.c_str())));
	EXPECT_EQ(0, System(StringPrintf("ln -s /some/target %s/sym",
	mount_path.c_str())));
	EXPECT_EQ(0, System(StringPrintf("ln %s/some_dir/test %s/testlink",
	mount_path.c_str(), mount_path.c_str())));
	EXPECT_EQ(0, System(StringPrintf("echo T > %s/srchardlink0",
	mount_path.c_str())));
	EXPECT_EQ(0, System(StringPrintf("ln %s/srchardlink0 %s/srchardlink1",
	mount_path.c_str(), mount_path.c_str())));
	EXPECT_EQ(0, System(StringPrintf("ln -s bogus %s/boguslink",
	mount_path.c_str())));
	EXPECT_TRUE(utils::UnmountFilesystem(mount_path.c_str()));

	if (out_paths) {
	out_paths->clear();
	out_paths->push_back("");
	out_paths->push_back("/hi");
	out_paths->push_back("/boguslink");
	out_paths->push_back("/hello");
	out_paths->push_back("/some_dir");
	out_paths->push_back("/some_dir/empty_dir");
	out_paths->push_back("/some_dir/mnt");
	out_paths->push_back("/some_dir/test");
	out_paths->push_back("/some_dir/fifo");
	out_paths->push_back("/cdev");
	out_paths->push_back("/testlink");
	out_paths->push_back("/sym");
	out_paths->push_back("/srchardlink0");
	out_paths->push_back("/srchardlink1");
	out_paths->push_back("/lost+found");
	}
	}

	ScopedLoopMounter::ScopedLoopMounter(const string& file_path,
	string* mnt_path,
	unsigned long flags) { // NOLINT - long
	EXPECT_TRUE(utils::MakeTempDirectory("mnt.XXXXXX", mnt_path));
	dir_remover_.reset(new ScopedDirRemover(*mnt_path));

	string loop_dev;
	loop_binder_.reset(new ScopedLoopbackDeviceBinder(file_path, &loop_dev));

	EXPECT_TRUE(utils::MountFilesystem(loop_dev, *mnt_path, flags));
	unmounter_.reset(new ScopedFilesystemUnmounter(*mnt_path));
	}

	base::FilePath GetBuildArtifactsPath() {
	base::FilePath exe_path;
	base::ReadSymbolicLink(base::FilePath("/proc/self/exe"), &exe_path);
	return exe_path.DirName();
	}

	} // namespace test_utils
	} // namespace chromeos_update_engine