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 <xz.h> 20 21 #include <base/at_exit.h> 22 #include <base/command_line.h> 23 #include <base/logging.h> 24 #include <brillo/flag_helper.h> 25 26 #include "update_engine/common/terminator.h" 27 #include "update_engine/common/utils.h" 28 #include "update_engine/daemon.h" 29 #include "update_engine/logging.h" 30 31 using std::string; 32 33 int main(int argc, char** argv) { 34 DEFINE_bool(logtofile, false, "Write logs to a file in log_dir."); 35 DEFINE_bool(logtostderr, 36 false, 37 "Write logs to stderr instead of to a file in log_dir."); 38 DEFINE_bool(foreground, false, "Don't daemon()ize; run in foreground."); 39 40 chromeos_update_engine::Terminator::Init(); 41 brillo::FlagHelper::Init(argc, argv, "A/B Update Engine"); 42 43 // We have two logging flags "--logtostderr" and "--logtofile"; and the logic 44 // to choose the logging destination is: 45 // 1. --logtostderr --logtofile -> logs to both 46 // 2. --logtostderr -> logs to system debug 47 // 3. --logtofile or no flags -> logs to file 48 bool log_to_system = FLAGS_logtostderr; 49 bool log_to_file = FLAGS_logtofile || !FLAGS_logtostderr; 50 chromeos_update_engine::SetupLogging(log_to_system, log_to_file); 51 if (!FLAGS_foreground) 52 PLOG_IF(FATAL, daemon(0, 0) == 1) << "daemon() failed"; 53 54 LOG(INFO) << "A/B Update Engine starting"; 55 56 // xz-embedded requires to initialize its CRC-32 table once on startup. 57 xz_crc32_init(); 58 59 // Ensure that all written files have safe permissions. 60 // This is a mask, so we _block_ all permissions for the group owner and other 61 // users but allow all permissions for the user owner. We allow execution 62 // for the owner so we can create directories. 63 // Done _after_ log file creation. 64 umask(S_IRWXG | S_IRWXO); 65 66 chromeos_update_engine::UpdateEngineDaemon update_engine_daemon; 67 int exit_code = update_engine_daemon.Run(); 68 69 chromeos_update_engine::Subprocess::Get().FlushBufferedLogsAtExit(); 70 71 LOG(INFO) << "A/B Update Engine terminating with exit code " << exit_code; 72 return exit_code; 73 } 74