2 * Copyright 2016 Facebook, Inc.
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
17 #include <folly/experimental/TestUtil.h>
19 #include <sys/types.h>
23 #include <boost/regex.hpp>
24 #include <folly/Conv.h>
25 #include <folly/Exception.h>
26 #include <folly/File.h>
27 #include <folly/FileUtil.h>
28 #include <folly/Memory.h>
29 #include <folly/String.h>
30 #include <folly/portability/Environment.h>
31 #include <folly/portability/Unistd.h>
38 fs::path generateUniquePath(fs::path path, StringPiece namePrefix) {
40 path = fs::temp_directory_path();
42 if (namePrefix.empty()) {
43 path /= fs::unique_path();
45 path /= fs::unique_path(
46 to<std::string>(namePrefix, ".%%%%-%%%%-%%%%-%%%%"));
53 TemporaryFile::TemporaryFile(StringPiece namePrefix,
56 bool closeOnDestruction)
58 closeOnDestruction_(closeOnDestruction),
60 path_(generateUniquePath(std::move(dir), namePrefix)) {
61 fd_ = open(path_.string().c_str(), O_RDWR | O_CREAT | O_EXCL, 0666);
62 checkUnixError(fd_, "open failed");
64 if (scope_ == Scope::UNLINK_IMMEDIATELY) {
65 boost::system::error_code ec;
66 fs::remove(path_, ec);
68 LOG(WARNING) << "unlink on construction failed: " << ec;
75 const fs::path& TemporaryFile::path() const {
76 CHECK(scope_ != Scope::UNLINK_IMMEDIATELY);
77 DCHECK(!path_.empty());
81 TemporaryFile::~TemporaryFile() {
82 if (fd_ != -1 && closeOnDestruction_) {
83 if (close(fd_) == -1) {
84 PLOG(ERROR) << "close failed";
88 // If we previously failed to unlink() (UNLINK_IMMEDIATELY), we'll
90 if (scope_ != Scope::PERMANENT && !path_.empty()) {
91 boost::system::error_code ec;
92 fs::remove(path_, ec);
94 LOG(WARNING) << "unlink on destruction failed: " << ec;
99 TemporaryDirectory::TemporaryDirectory(
100 StringPiece namePrefix,
104 path_(folly::make_unique<fs::path>(
105 generateUniquePath(std::move(dir), namePrefix))) {
106 fs::create_directory(path());
109 TemporaryDirectory::~TemporaryDirectory() {
110 if (scope_ == Scope::DELETE_ON_DESTRUCTION && path_ != nullptr) {
111 boost::system::error_code ec;
112 fs::remove_all(path(), ec);
114 LOG(WARNING) << "recursive delete on destruction failed: " << ec;
119 ChangeToTempDir::ChangeToTempDir() : initialPath_(fs::current_path()) {
120 std::string p = dir_.path().string();
124 ChangeToTempDir::~ChangeToTempDir() {
125 std::string p = initialPath_.string();
131 bool hasPCREPatternMatch(StringPiece pattern, StringPiece target) {
132 return boost::regex_match(
135 boost::regex(pattern.begin(), pattern.end())
139 bool hasNoPCREPatternMatch(StringPiece pattern, StringPiece target) {
140 return !hasPCREPatternMatch(pattern, target);
143 } // namespace detail
145 CaptureFD::CaptureFD(int fd, ChunkCob chunk_cob)
146 : chunkCob_(std::move(chunk_cob)), fd_(fd), readOffset_(0) {
147 oldFDCopy_ = dup(fd_);
148 PCHECK(oldFDCopy_ != -1) << "Could not copy FD " << fd_;
150 int file_fd = open(file_.path().string().c_str(), O_WRONLY|O_CREAT, 0600);
151 PCHECK(dup2(file_fd, fd_) != -1) << "Could not replace FD " << fd_
152 << " with " << file_fd;
153 PCHECK(close(file_fd) != -1) << "Could not close " << file_fd;
156 void CaptureFD::release() {
157 if (oldFDCopy_ != fd_) {
158 readIncremental(); // Feed chunkCob_
159 PCHECK(dup2(oldFDCopy_, fd_) != -1) << "Could not restore old FD "
160 << oldFDCopy_ << " into " << fd_;
161 PCHECK(close(oldFDCopy_) != -1) << "Could not close " << oldFDCopy_;
162 oldFDCopy_ = fd_; // Make this call idempotent
166 CaptureFD::~CaptureFD() {
170 std::string CaptureFD::read() const {
171 std::string contents;
172 std::string filename = file_.path().string();
173 PCHECK(folly::readFile(filename.c_str(), contents));
177 std::string CaptureFD::readIncremental() {
178 std::string filename = file_.path().string();
179 // Yes, I know that I could just keep the file open instead. So sue me.
180 folly::File f(openNoInt(filename.c_str(), O_RDONLY), true);
181 auto size = lseek(f.fd(), 0, SEEK_END) - readOffset_;
182 std::unique_ptr<char[]> buf(new char[size]);
183 auto bytes_read = folly::preadFull(f.fd(), buf.get(), size, readOffset_);
184 PCHECK(size == bytes_read);
186 chunkCob_(StringPiece(buf.get(), buf.get() + size));
187 return std::string(buf.get(), size);
190 static std::map<std::string, std::string> getEnvVarMap() {
191 std::map<std::string, std::string> data;
192 for (auto it = environ; *it != nullptr; ++it) {
193 std::string key, value;
194 split("=", *it, key, value);
198 CHECK(!data.count(key)) << "already contains: " << key;
199 data.emplace(move(key), move(value));
204 EnvVarSaver::EnvVarSaver() {
205 saved_ = getEnvVarMap();
208 EnvVarSaver::~EnvVarSaver() {
209 for (const auto& kvp : getEnvVarMap()) {
210 if (saved_.count(kvp.first)) {
213 PCHECK(0 == unsetenv(kvp.first.c_str()));
215 for (const auto& kvp : saved_) {
216 PCHECK(0 == setenv(kvp.first.c_str(), kvp.second.c_str(), (int)true));