blob: 0219075ca5de13a9578aaf1d3684ae6a26cccf68 [file] [log] [blame]
//
// Copyright (C) 2020 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 <inttypes.h>
#include <stdio.h>
#include <sys/stat.h>
#include <unistd.h>
#include <algorithm>
#include <functional>
#include <iomanip>
#include <string>
#include <string_view>
#include <vector>
#include <android-base/file.h>
#include <android-base/strings.h>
#include <android-base/unique_fd.h>
#include <base/files/dir_reader_posix.h>
#include <base/logging.h>
#include <base/strings/string_util.h>
#include <base/strings/stringprintf.h>
#include <log/log.h>
#include "update_engine/common/utils.h"
using std::string;
#ifdef _UE_SIDELOAD
constexpr bool kSideload = true;
#else
constexpr bool kSideload = false;
#endif
namespace chromeos_update_engine {
namespace {
constexpr char kSystemLogsRoot[] = "/data/misc/update_engine_log";
constexpr size_t kLogCount = 5;
// Keep the most recent |kLogCount| logs but remove the old ones in
// "/data/misc/update_engine_log/".
void DeleteOldLogs(const string& kLogsRoot) {
base::DirReaderPosix reader(kLogsRoot.c_str());
if (!reader.IsValid()) {
LOG(ERROR) << "Failed to read " << kLogsRoot;
return;
}
std::vector<string> old_logs;
while (reader.Next()) {
if (reader.name()[0] == '.')
continue;
// Log files are in format "update_engine.%Y%m%d-%H%M%S",
// e.g. update_engine.20090103-231425
uint64_t date;
uint64_t local_time;
if (sscanf(reader.name(),
"update_engine.%" PRIu64 "-%" PRIu64 "",
&date,
&local_time) == 2) {
old_logs.push_back(reader.name());
} else {
LOG(WARNING) << "Unrecognized log file " << reader.name();
}
}
std::sort(old_logs.begin(), old_logs.end(), std::greater<string>());
for (size_t i = kLogCount; i < old_logs.size(); i++) {
string log_path = kLogsRoot + "/" + old_logs[i];
if (unlink(log_path.c_str()) == -1) {
PLOG(WARNING) << "Failed to unlink " << log_path;
}
}
}
string SetupLogFile(const string& kLogsRoot) {
DeleteOldLogs(kLogsRoot);
return base::StringPrintf("%s/update_engine.%s",
kLogsRoot.c_str(),
utils::GetTimeAsString(::time(nullptr)).c_str());
}
const char* LogPriorityToCString(int priority) {
switch (priority) {
case ANDROID_LOG_VERBOSE:
return "VERBOSE";
case ANDROID_LOG_DEBUG:
return "DEBUG";
case ANDROID_LOG_INFO:
return "INFO";
case ANDROID_LOG_WARN:
return "WARN";
case ANDROID_LOG_ERROR:
return "ERROR";
case ANDROID_LOG_FATAL:
return "FATAL";
default:
return "UNKNOWN";
}
}
using LoggerFunction = std::function<void(const struct __android_log_message*)>;
class FileLogger {
public:
explicit FileLogger(const string& path) {
fd_.reset(TEMP_FAILURE_RETRY(
open(path.c_str(),
O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC | O_NOFOLLOW | O_SYNC,
0644)));
if (fd_ == -1) {
// Use ALOGE that logs to logd before __android_log_set_logger.
ALOGE("Cannot open persistent log %s: %s", path.c_str(), strerror(errno));
return;
}
// The log file will have AID_LOG as group ID; this GID is inherited from
// the parent directory "/data/misc/update_engine_log" which sets the SGID
// bit.
if (fchmod(fd_.get(), 0640) == -1) {
// Use ALOGE that logs to logd before __android_log_set_logger.
ALOGE("Cannot chmod 0640 persistent log %s: %s",
path.c_str(),
strerror(errno));
return;
}
}
// Copy-constructor needed to be converted to std::function.
FileLogger(const FileLogger& other) { fd_.reset(dup(other.fd_)); }
void operator()(const struct __android_log_message* log_message) {
if (fd_ == -1) {
return;
}
std::string_view message_str =
log_message->message != nullptr ? log_message->message : "";
WriteToFd(GetPrefix(log_message));
WriteToFd(message_str);
WriteToFd("\n");
}
private:
android::base::unique_fd fd_;
void WriteToFd(std::string_view message) {
ignore_result(
android::base::WriteFully(fd_, message.data(), message.size()));
}
string GetPrefix(const struct __android_log_message* log_message) {
std::stringstream ss;
timeval tv;
gettimeofday(&tv, nullptr);
time_t t = tv.tv_sec;
struct tm local_time;
localtime_r(&t, &local_time);
struct tm* tm_time = &local_time;
ss << "[" << std::setfill('0') << std::setw(2) << 1 + tm_time->tm_mon
<< std::setw(2) << tm_time->tm_mday << '/' << std::setw(2)
<< tm_time->tm_hour << std::setw(2) << tm_time->tm_min << std::setw(2)
<< tm_time->tm_sec << '.' << std::setw(6) << tv.tv_usec << "] ";
// libchrome logs prepends |message| with severity, file and line, but
// leave logger_data->file as nullptr.
// libbase / liblog logs doesn't. Hence, add them to match the style.
// For liblog logs that doesn't set logger_data->file, not printing the
// priority is acceptable.
if (log_message->file) {
ss << "[" << LogPriorityToCString(log_message->priority) << ':'
<< log_message->file << '(' << log_message->line << ")] ";
}
return ss.str();
}
};
class CombinedLogger {
public:
CombinedLogger(bool log_to_system, bool log_to_file) {
if (log_to_system) {
if (kSideload) {
// No logd in sideload. Use stdout.
// recovery has already redirected stdio properly.
loggers_.push_back(__android_log_stderr_logger);
} else {
loggers_.push_back(__android_log_logd_logger);
}
}
if (log_to_file) {
loggers_.push_back(std::move(FileLogger(SetupLogFile(kSystemLogsRoot))));
}
}
void operator()(const struct __android_log_message* log_message) {
for (auto&& logger : loggers_) {
logger(log_message);
}
}
private:
std::vector<LoggerFunction> loggers_;
};
// Redirect all libchrome logs to liblog using our custom handler that does
// not call __android_log_write and explicitly write to stderr at the same
// time. The preset CombinedLogger already writes to stderr properly.
bool RedirectToLiblog(int severity,
const char* file,
int line,
size_t message_start,
const std::string& str_newline) {
android_LogPriority priority =
(severity < 0) ? ANDROID_LOG_VERBOSE : ANDROID_LOG_UNKNOWN;
switch (severity) {
case logging::LOG_INFO:
priority = ANDROID_LOG_INFO;
break;
case logging::LOG_WARNING:
priority = ANDROID_LOG_WARN;
break;
case logging::LOG_ERROR:
priority = ANDROID_LOG_ERROR;
break;
case logging::LOG_FATAL:
priority = ANDROID_LOG_FATAL;
break;
}
std::string_view sv = str_newline;
ignore_result(android::base::ConsumeSuffix(&sv, "\n"));
std::string str(sv.data(), sv.size());
// This will eventually be redirected to CombinedLogger.
// Use nullptr as tag so that liblog infers log tag from getprogname().
__android_log_write(priority, nullptr /* tag */, str.c_str());
return true;
}
} // namespace
void SetupLogging(bool log_to_system, bool log_to_file) {
// Note that libchrome logging uses liblog.
// By calling liblog's __android_log_set_logger function, all of libchrome
// (used by update_engine) / libbase / liblog (used by depended modules)
// logging eventually redirects to CombinedLogger.
static auto g_logger =
std::make_unique<CombinedLogger>(log_to_system, log_to_file);
__android_log_set_logger([](const struct __android_log_message* log_message) {
(*g_logger)(log_message);
});
// libchrome logging should not log to file.
logging::LoggingSettings log_settings;
log_settings.lock_log = logging::DONT_LOCK_LOG_FILE;
log_settings.logging_dest =
static_cast<logging::LoggingDestination>(logging::LOG_NONE);
log_settings.log_file = nullptr;
logging::InitLogging(log_settings);
logging::SetLogItems(false /* enable_process_id */,
false /* enable_thread_id */,
false /* enable_timestamp */,
false /* enable_tickcount */);
logging::SetLogMessageHandler(&RedirectToLiblog);
}
} // namespace chromeos_update_engine