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//
// Copyright (C) 2019 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 <sysexits.h>
#include <chrono>
#include <iostream>
#include <map>
#include <sstream>
#include <android-base/file.h>
#include <android-base/logging.h>
#include <android-base/unique_fd.h>
#include <libsnapshot/snapshot.h>
#include "utility.h"
#include "utility.h"
using namespace std::string_literals;
int Usage() {
std::cerr << "snapshotctl: Control snapshots.\n"
"Usage: snapshotctl [action] [flags]\n"
"Actions:\n"
" dump\n"
" Print snapshot states.\n"
" merge [--logcat] [--log-to-file]\n"
" Initialize merge and wait for it to be completed.\n"
" If --logcat is specified, log to logcat.\n"
" If --log-to-file is specified, log to /data/misc/snapshotctl_log/.\n"
" If both specified, log to both. If none specified, log to stdout.\n";
return EX_USAGE;
}
namespace android {
namespace snapshot {
bool DumpCmdHandler(int /*argc*/, char** argv) {
android::base::InitLogging(argv, &android::base::StderrLogger);
return SnapshotManager::New()->Dump(std::cout);
}
class FileLogger {
public:
FileLogger() {
static constexpr const char* kLogFilePath = "/data/misc/snapshotctl_log/";
std::stringstream ss;
ss << kLogFilePath << "snapshotctl." << Now() << ".log";
fd_.reset(TEMP_FAILURE_RETRY(
open(ss.str().c_str(),
O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC | O_NOFOLLOW | O_SYNC, 0660)));
}
// Copy-contuctor needed to be converted to std::function.
FileLogger(const FileLogger& other) { fd_.reset(dup(other.fd_)); }
void operator()(android::base::LogId, android::base::LogSeverity, const char* /*tag*/,
const char* /*file*/, unsigned int /*line*/, const char* message) {
if (fd_ == -1) return;
std::stringstream ss;
ss << Now() << ":" << message << "\n";
(void)android::base::WriteStringToFd(ss.str(), fd_);
}
private:
android::base::unique_fd fd_;
};
class MergeCmdLogger {
public:
MergeCmdLogger(int argc, char** argv) {
for (int i = 0; i < argc; ++i) {
if (argv[i] == "--logcat"s) {
loggers_.push_back(android::base::LogdLogger());
}
if (argv[i] == "--log-to-file"s) {
loggers_.push_back(std::move(FileLogger()));
}
}
if (loggers_.empty()) {
loggers_.push_back(&android::base::StdioLogger);
}
}
void operator()(android::base::LogId id, android::base::LogSeverity severity, const char* tag,
const char* file, unsigned int line, const char* message) {
for (auto&& logger : loggers_) {
logger(id, severity, tag, file, line, message);
}
}
private:
std::vector<android::base::LogFunction> loggers_;
};
bool MergeCmdHandler(int argc, char** argv) {
auto begin = std::chrono::steady_clock::now();
// 'snapshotctl merge' is stripped away from arguments to
// Logger.
android::base::InitLogging(argv, MergeCmdLogger(argc - 2, argv + 2));
auto state = SnapshotManager::New()->InitiateMergeAndWait();
// We could wind up in the Unverified state if the device rolled back or
// hasn't fully rebooted. Ignore this.
if (state == UpdateState::None || state == UpdateState::Unverified) {
return true;
}
if (state == UpdateState::MergeCompleted) {
auto end = std::chrono::steady_clock::now();
auto passed = std::chrono::duration_cast<std::chrono::milliseconds>(end - begin).count();
LOG(INFO) << "Snapshot merged in " << passed << " ms.";
return true;
}
LOG(ERROR) << "Snapshot failed to merge with state \"" << state << "\".";
return false;
}
static std::map<std::string, std::function<bool(int, char**)>> kCmdMap = {
// clang-format off
{"dump", DumpCmdHandler},
{"merge", MergeCmdHandler},
// clang-format on
};
} // namespace snapshot
} // namespace android
int main(int argc, char** argv) {
using namespace android::snapshot;
if (argc < 2) {
return Usage();
}
for (const auto& cmd : kCmdMap) {
if (cmd.first == argv[1]) {
return cmd.second(argc, argv) ? EX_OK : EX_SOFTWARE;
}
}
return Usage();
}
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