[REFACTOR] Split Android and CrOS logging.
Previously, they are all cramped in main.cc. Split them
into their respective files logging.cc, logging_android.cc
and provide a common header, logging.h, that main.cc can use.
Bug: 147696014
Bug: 148818798
Test: builds
Test: build logging.cc in Android
Change-Id: Iafdaee6be20e204f4faa1d1d8f81e43670f08d96
diff --git a/main.cc b/main.cc
index 26f9efb..4377a15 100644
--- a/main.cc
+++ b/main.cc
@@ -14,149 +14,22 @@
// limitations under the License.
//
-#include <inttypes.h>
#include <sys/stat.h>
#include <sys/types.h>
-#include <unistd.h>
#include <xz.h>
-#include <algorithm>
-#include <string>
-#include <vector>
-
#include <base/at_exit.h>
#include <base/command_line.h>
-#include <base/files/dir_reader_posix.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"
+#include "update_engine/logging.h"
using std::string;
-namespace chromeos_update_engine {
-namespace {
-
-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;
-}
-
-#ifdef __ANDROID__
-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(),
- GetTimeAsString(::time(nullptr)).c_str());
-}
-#else
-constexpr char kSystemLogsRoot[] = "/var/log";
-
-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 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) {
- log_file = SetupLogFile(kSystemLogsRoot);
- log_settings.delete_old = logging::APPEND_TO_OLD_LOG_FILE;
- log_settings.log_file = log_file.c_str();
- }
- logging::InitLogging(log_settings);
-
-#ifdef __ANDROID__
- // 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.
- chmod(log_file.c_str(), 0640);
-#endif
-}
-
-} // 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,