//
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// Copyright (C) 2012 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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#include <inttypes.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <xz.h>
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#include <algorithm>
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#include <string>
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#include <vector>
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#include <base/at_exit.h>
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#include <base/command_line.h>
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#include <base/files/dir_reader_posix.h>
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#include <base/files/file_util.h>
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#include <base/logging.h>
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#include <base/strings/string_util.h>
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#include <base/strings/stringprintf.h>
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#include <brillo/flag_helper.h>
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#include "update_engine/common/terminator.h"
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#include "update_engine/common/utils.h"
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#include "update_engine/daemon.h"
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using std::string;
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namespace chromeos_update_engine {
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namespace {
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string GetTimeAsString(time_t utime) {
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struct tm tm;
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CHECK_EQ(localtime_r(&utime, &tm), &tm);
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char str[16];
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CHECK_EQ(strftime(str, sizeof(str), "%Y%m%d-%H%M%S", &tm), 15u);
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return str;
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}
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#ifdef __ANDROID__
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constexpr char kSystemLogsRoot[] = "/data/misc/update_engine_log";
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constexpr size_t kLogCount = 5;
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// Keep the most recent |kLogCount| logs but remove the old ones in
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// "/data/misc/update_engine_log/".
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void DeleteOldLogs(const string& kLogsRoot) {
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base::DirReaderPosix reader(kLogsRoot.c_str());
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if (!reader.IsValid()) {
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LOG(ERROR) << "Failed to read " << kLogsRoot;
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return;
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}
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std::vector<string> old_logs;
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while (reader.Next()) {
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if (reader.name()[0] == '.')
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continue;
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// Log files are in format "update_engine.%Y%m%d-%H%M%S",
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// e.g. update_engine.20090103-231425
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uint64_t date;
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uint64_t local_time;
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if (sscanf(reader.name(),
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"update_engine.%" PRIu64 "-%" PRIu64 "",
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&date,
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&local_time) == 2) {
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old_logs.push_back(reader.name());
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} else {
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LOG(WARNING) << "Unrecognized log file " << reader.name();
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}
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}
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std::sort(old_logs.begin(), old_logs.end(), std::greater<string>());
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for (size_t i = kLogCount; i < old_logs.size(); i++) {
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string log_path = kLogsRoot + "/" + old_logs[i];
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if (unlink(log_path.c_str()) == -1) {
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PLOG(WARNING) << "Failed to unlink " << log_path;
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}
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}
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}
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string SetupLogFile(const string& kLogsRoot) {
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DeleteOldLogs(kLogsRoot);
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return base::StringPrintf("%s/update_engine.%s",
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kLogsRoot.c_str(),
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GetTimeAsString(::time(nullptr)).c_str());
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}
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#else
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constexpr char kSystemLogsRoot[] = "/var/log";
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void SetupLogSymlink(const string& symlink_path, const string& log_path) {
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// TODO(petkov): To ensure a smooth transition between non-timestamped and
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// timestamped logs, move an existing log to start the first timestamped
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// one. This code can go away once all clients are switched to this version or
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// we stop caring about the old-style logs.
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if (utils::FileExists(symlink_path.c_str()) &&
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!utils::IsSymlink(symlink_path.c_str())) {
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base::ReplaceFile(
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base::FilePath(symlink_path), base::FilePath(log_path), nullptr);
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}
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base::DeleteFile(base::FilePath(symlink_path), true);
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if (symlink(log_path.c_str(), symlink_path.c_str()) == -1) {
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PLOG(ERROR) << "Unable to create symlink " << symlink_path
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<< " pointing at " << log_path;
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}
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}
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string SetupLogFile(const string& kLogsRoot) {
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const string kLogSymlink = kLogsRoot + "/update_engine.log";
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const string kLogsDir = kLogsRoot + "/update_engine";
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const string kLogPath =
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base::StringPrintf("%s/update_engine.%s",
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kLogsDir.c_str(),
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GetTimeAsString(::time(nullptr)).c_str());
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mkdir(kLogsDir.c_str(), 0755);
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SetupLogSymlink(kLogSymlink, kLogPath);
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return kLogSymlink;
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}
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#endif // __ANDROID__
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void SetupLogging(bool log_to_system, bool log_to_file) {
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logging::LoggingSettings log_settings;
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log_settings.lock_log = logging::DONT_LOCK_LOG_FILE;
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log_settings.logging_dest = static_cast<logging::LoggingDestination>(
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(log_to_system ? logging::LOG_TO_SYSTEM_DEBUG_LOG : 0) |
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(log_to_file ? logging::LOG_TO_FILE : 0));
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log_settings.log_file = nullptr;
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string log_file;
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if (log_to_file) {
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log_file = SetupLogFile(kSystemLogsRoot);
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log_settings.delete_old = logging::APPEND_TO_OLD_LOG_FILE;
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log_settings.log_file = log_file.c_str();
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}
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logging::InitLogging(log_settings);
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#ifdef __ANDROID__
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// The log file will have AID_LOG as group ID; this GID is inherited from the
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// parent directory "/data/misc/update_engine_log" which sets the SGID bit.
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chmod(log_file.c_str(), 0640);
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#endif
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}
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} // namespace
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} // namespace chromeos_update_engine
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int main(int argc, char** argv) {
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DEFINE_bool(logtofile, false, "Write logs to a file in log_dir.");
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DEFINE_bool(logtostderr,
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false,
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"Write logs to stderr instead of to a file in log_dir.");
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DEFINE_bool(foreground, false, "Don't daemon()ize; run in foreground.");
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chromeos_update_engine::Terminator::Init();
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brillo::FlagHelper::Init(argc, argv, "A/B Update Engine");
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// We have two logging flags "--logtostderr" and "--logtofile"; and the logic
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// to choose the logging destination is:
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// 1. --logtostderr --logtofile -> logs to both
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// 2. --logtostderr -> logs to system debug
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// 3. --logtofile or no flags -> logs to file
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bool log_to_system = FLAGS_logtostderr;
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bool log_to_file = FLAGS_logtofile || !FLAGS_logtostderr;
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chromeos_update_engine::SetupLogging(log_to_system, log_to_file);
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if (!FLAGS_foreground)
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PLOG_IF(FATAL, daemon(0, 0) == 1) << "daemon() failed";
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LOG(INFO) << "A/B Update Engine starting";
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// xz-embedded requires to initialize its CRC-32 table once on startup.
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xz_crc32_init();
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// Ensure that all written files have safe permissions.
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// This is a mask, so we _block_ all permissions for the group owner and other
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// users but allow all permissions for the user owner. We allow execution
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// for the owner so we can create directories.
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// Done _after_ log file creation.
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umask(S_IRWXG | S_IRWXO);
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chromeos_update_engine::UpdateEngineDaemon update_engine_daemon;
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int exit_code = update_engine_daemon.Run();
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chromeos_update_engine::Subprocess::Get().FlushBufferedLogsAtExit();
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LOG(INFO) << "A/B Update Engine terminating with exit code " << exit_code;
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return exit_code;
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}
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