blob: 91805aef9ee7774a275fb2db819ca9bbaf34c5fb [file] [log] [blame]
//
// 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 "update_engine/common/terminator.h"
#include "update_engine/common/utils.h"
#include "update_engine/daemon.h"
using std::string;
namespace chromeos_update_engine {
namespace {
#ifndef __ANDROID__
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;
}
#endif // __ANDROID__
void SetupLogging(bool log_to_system, bool log_to_file) {
logging::LoggingSettings log_settings;
log_settings.lock_log = logging::DONT_LOCK_LOG_FILE;
log_settings.logging_dest = static_cast<logging::LoggingDestination>(
(log_to_system ? logging::LOG_TO_SYSTEM_DEBUG_LOG : 0) |
(log_to_file ? logging::LOG_TO_FILE : 0));
log_settings.log_file = nullptr;
string log_file;
if (log_to_file) {
#ifdef __ANDROID__
log_file = "/data/misc/update_engine/update_engine.log";
log_settings.delete_old = logging::DELETE_OLD_LOG_FILE;
#else
log_file = SetupLogFile("/var/log");
log_settings.delete_old = logging::APPEND_TO_OLD_LOG_FILE;
#endif // __ANDROID__
log_settings.log_file = log_file.c_str();
}
logging::InitLogging(log_settings);
}
} // namespace
} // namespace chromeos_update_engine
int main(int argc, char** argv) {
DEFINE_bool(logtofile, false, "Write logs to a file in log_dir.");
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");
// We have two logging flags "--logtostderr" and "--logtofile"; and the logic
// to choose the logging destination is:
// 1. --logtostderr --logtofile -> logs to both
// 2. --logtostderr -> logs to system debug
// 3. --logtofile or no flags -> logs to file
bool log_to_system = FLAGS_logtostderr;
bool log_to_file = FLAGS_logtofile || !FLAGS_logtostderr;
chromeos_update_engine::SetupLogging(log_to_system, log_to_file);
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;
}