1 // 2 // Copyright (C) 2012 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 <sys/stat.h> 18 #include <sys/types.h> 19 #include <unistd.h> 20 #include <xz.h> 21 22 #include <string> 23 24 #include <base/at_exit.h> 25 #include <base/command_line.h> 26 #include <base/files/file_util.h> 27 #include <base/logging.h> 28 #include <base/strings/string_util.h> 29 #include <base/strings/stringprintf.h> 30 #include <brillo/flag_helper.h> 31 32 #include "update_engine/common/terminator.h" 33 #include "update_engine/common/utils.h" 34 #include "update_engine/daemon.h" 35 36 using std::string; 37 38 namespace chromeos_update_engine { 39 namespace { 40 41 void SetupLogSymlink(const string& symlink_path, const string& log_path) { 42 // TODO(petkov): To ensure a smooth transition between non-timestamped and 43 // timestamped logs, move an existing log to start the first timestamped 44 // one. This code can go away once all clients are switched to this version or 45 // we stop caring about the old-style logs. 46 if (utils::FileExists(symlink_path.c_str()) && 47 !utils::IsSymlink(symlink_path.c_str())) { 48 base::ReplaceFile(base::FilePath(symlink_path), 49 base::FilePath(log_path), 50 nullptr); 51 } 52 base::DeleteFile(base::FilePath(symlink_path), true); 53 if (symlink(log_path.c_str(), symlink_path.c_str()) == -1) { 54 PLOG(ERROR) << "Unable to create symlink " << symlink_path 55 << " pointing at " << log_path; 56 } 57 } 58 59 string GetTimeAsString(time_t utime) { 60 struct tm tm; 61 CHECK_EQ(localtime_r(&utime, &tm), &tm); 62 char str[16]; 63 CHECK_EQ(strftime(str, sizeof(str), "%Y%m%d-%H%M%S", &tm), 15u); 64 return str; 65 } 66 67 string SetupLogFile(const string& kLogsRoot) { 68 const string kLogSymlink = kLogsRoot + "/update_engine.log"; 69 const string kLogsDir = kLogsRoot + "/update_engine"; 70 const string kLogPath = 71 base::StringPrintf("%s/update_engine.%s", 72 kLogsDir.c_str(), 73 GetTimeAsString(::time(nullptr)).c_str()); 74 mkdir(kLogsDir.c_str(), 0755); 75 SetupLogSymlink(kLogSymlink, kLogPath); 76 return kLogSymlink; 77 } 78 79 void SetupLogging(bool log_to_std_err) { 80 string log_file; 81 logging::LoggingSettings log_settings; 82 log_settings.lock_log = logging::DONT_LOCK_LOG_FILE; 83 log_settings.delete_old = logging::APPEND_TO_OLD_LOG_FILE; 84 85 if (log_to_std_err) { 86 // Log to stderr initially. 87 log_settings.log_file = nullptr; 88 log_settings.logging_dest = logging::LOG_TO_SYSTEM_DEBUG_LOG; 89 } else { 90 log_file = SetupLogFile("/var/log"); 91 log_settings.log_file = log_file.c_str(); 92 log_settings.logging_dest = logging::LOG_TO_FILE; 93 } 94 95 logging::InitLogging(log_settings); 96 } 97 98 } // namespace 99 } // namespace chromeos_update_engine 100 101 int main(int argc, char** argv) { 102 DEFINE_bool(logtostderr, false, 103 "Write logs to stderr instead of to a file in log_dir."); 104 DEFINE_bool(foreground, false, 105 "Don't daemon()ize; run in foreground."); 106 107 chromeos_update_engine::Terminator::Init(); 108 brillo::FlagHelper::Init(argc, argv, "Chromium OS Update Engine"); 109 chromeos_update_engine::SetupLogging(FLAGS_logtostderr); 110 if (!FLAGS_foreground) 111 PLOG_IF(FATAL, daemon(0, 0) == 1) << "daemon() failed"; 112 113 LOG(INFO) << "Chrome OS Update Engine starting"; 114 115 // xz-embedded requires to initialize its CRC-32 table once on startup. 116 xz_crc32_init(); 117 118 // Ensure that all written files have safe permissions. 119 // This is a mask, so we _block_ all permissions for the group owner and other 120 // users but allow all permissions for the user owner. We allow execution 121 // for the owner so we can create directories. 122 // Done _after_ log file creation. 123 umask(S_IRWXG | S_IRWXO); 124 125 chromeos_update_engine::UpdateEngineDaemon update_engine_daemon; 126 int exit_code = update_engine_daemon.Run(); 127 128 LOG(INFO) << "Chrome OS Update Engine terminating with exit code " 129 << exit_code; 130 return exit_code; 131 } 132
