| // |
| // 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 <sys/stat.h> |
| #include <sys/types.h> |
| #include <unistd.h> |
| #include <xz.h> |
| |
| #include <string> |
| |
| #include <base/at_exit.h> |
| #include <base/command_line.h> |
| #include <base/files/file_util.h> |
| #include <base/logging.h> |
| #include <base/strings/string_util.h> |
| #include <base/strings/stringprintf.h> |
| #include <brillo/flag_helper.h> |
| #include <brillo/message_loops/base_message_loop.h> |
| #include <metrics/metrics_library.h> |
| |
| #include "update_engine/common/terminator.h" |
| #include "update_engine/common/utils.h" |
| #include "update_engine/daemon.h" |
| |
| using std::string; |
| |
| namespace chromeos_update_engine { |
| namespace { |
| |
| void SetupLogSymlink(const string& symlink_path, const string& log_path) { |
| // TODO(petkov): To ensure a smooth transition between non-timestamped and |
| // timestamped logs, move an existing log to start the first timestamped |
| // one. This code can go away once all clients are switched to this version or |
| // we stop caring about the old-style logs. |
| if (utils::FileExists(symlink_path.c_str()) && |
| !utils::IsSymlink(symlink_path.c_str())) { |
| base::ReplaceFile(base::FilePath(symlink_path), |
| base::FilePath(log_path), |
| nullptr); |
| } |
| base::DeleteFile(base::FilePath(symlink_path), true); |
| if (symlink(log_path.c_str(), symlink_path.c_str()) == -1) { |
| PLOG(ERROR) << "Unable to create symlink " << symlink_path |
| << " pointing at " << log_path; |
| } |
| } |
| |
| string GetTimeAsString(time_t utime) { |
| struct tm tm; |
| CHECK_EQ(localtime_r(&utime, &tm), &tm); |
| char str[16]; |
| CHECK_EQ(strftime(str, sizeof(str), "%Y%m%d-%H%M%S", &tm), 15u); |
| return str; |
| } |
| |
| string SetupLogFile(const string& kLogsRoot) { |
| const string kLogSymlink = kLogsRoot + "/update_engine.log"; |
| const string kLogsDir = kLogsRoot + "/update_engine"; |
| const string kLogPath = |
| base::StringPrintf("%s/update_engine.%s", |
| kLogsDir.c_str(), |
| GetTimeAsString(::time(nullptr)).c_str()); |
| mkdir(kLogsDir.c_str(), 0755); |
| SetupLogSymlink(kLogSymlink, kLogPath); |
| return kLogSymlink; |
| } |
| |
| void SetupLogging(bool log_to_std_err) { |
| string log_file; |
| logging::LoggingSettings log_settings; |
| log_settings.lock_log = logging::DONT_LOCK_LOG_FILE; |
| log_settings.delete_old = logging::APPEND_TO_OLD_LOG_FILE; |
| |
| if (log_to_std_err) { |
| // Log to stderr initially. |
| log_settings.log_file = nullptr; |
| log_settings.logging_dest = logging::LOG_TO_SYSTEM_DEBUG_LOG; |
| } else { |
| log_file = SetupLogFile("/var/log"); |
| log_settings.log_file = log_file.c_str(); |
| log_settings.logging_dest = logging::LOG_TO_FILE; |
| } |
| |
| logging::InitLogging(log_settings); |
| } |
| |
| } // namespace |
| } // namespace chromeos_update_engine |
| |
| int main(int argc, char** argv) { |
| DEFINE_bool(logtostderr, false, |
| "Write logs to stderr instead of to a file in log_dir."); |
| DEFINE_bool(foreground, false, |
| "Don't daemon()ize; run in foreground."); |
| |
| chromeos_update_engine::Terminator::Init(); |
| brillo::FlagHelper::Init(argc, argv, "Chromium OS Update Engine"); |
| chromeos_update_engine::SetupLogging(FLAGS_logtostderr); |
| if (!FLAGS_foreground) |
| PLOG_IF(FATAL, daemon(0, 0) == 1) << "daemon() failed"; |
| |
| LOG(INFO) << "Chrome OS Update Engine starting"; |
| |
| // xz-embedded requires to initialize its CRC-32 table once on startup. |
| xz_crc32_init(); |
| |
| // Ensure that all written files have safe permissions. |
| // This is a mask, so we _block_ all permissions for the group owner and other |
| // users but allow all permissions for the user owner. We allow execution |
| // for the owner so we can create directories. |
| // Done _after_ log file creation. |
| umask(S_IRWXG | S_IRWXO); |
| |
| chromeos_update_engine::UpdateEngineDaemon update_engine_daemon; |
| int exit_code = update_engine_daemon.Run(); |
| |
| LOG(INFO) << "Chrome OS Update Engine terminating with exit code " |
| << exit_code; |
| return exit_code; |
| } |