| /* |
| * 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. |
| */ |
| |
| package com.android.server.power; |
| |
| import android.annotation.NonNull; |
| import android.content.Context; |
| import android.os.Environment; |
| import android.os.IBinder; |
| import android.os.ParcelFileDescriptor; |
| import android.os.RemoteException; |
| import android.os.ServiceManager; |
| import android.provider.Settings; |
| import android.util.Slog; |
| |
| import com.android.internal.annotations.GuardedBy; |
| import com.android.internal.annotations.VisibleForTesting; |
| import com.android.internal.util.ArrayUtils; |
| |
| import java.io.File; |
| import java.io.FileNotFoundException; |
| import java.io.FileWriter; |
| import java.io.IOException; |
| |
| /** |
| * Provides utils to dump/wipe pre-reboot information. |
| */ |
| final class PreRebootLogger { |
| private static final String TAG = "PreRebootLogger"; |
| private static final String PREREBOOT_DIR = "prereboot"; |
| |
| private static final String[] BUFFERS_TO_DUMP = {"system"}; |
| private static final String[] SERVICES_TO_DUMP = {Context.ROLLBACK_SERVICE, "package"}; |
| |
| private static final Object sLock = new Object(); |
| |
| /** |
| * Process pre-reboot information. Dump pre-reboot information to {@link #PREREBOOT_DIR} if |
| * enabled {@link Settings.Global#ADB_ENABLED}; wipe dumped information otherwise. |
| */ |
| static void log(Context context) { |
| log(context, getDumpDir()); |
| } |
| |
| @VisibleForTesting |
| static void log(Context context, @NonNull File dumpDir) { |
| if (Settings.Global.getInt( |
| context.getContentResolver(), Settings.Global.ADB_ENABLED, 0) == 1) { |
| Slog.d(TAG, "Dumping pre-reboot information..."); |
| dump(dumpDir); |
| } else { |
| Slog.d(TAG, "Wiping pre-reboot information..."); |
| wipe(dumpDir); |
| } |
| } |
| |
| private static void dump(@NonNull File dumpDir) { |
| synchronized (sLock) { |
| for (String buffer : BUFFERS_TO_DUMP) { |
| dumpLogsLocked(dumpDir, buffer); |
| } |
| for (String service : SERVICES_TO_DUMP) { |
| dumpServiceLocked(dumpDir, service); |
| } |
| } |
| } |
| |
| private static void wipe(@NonNull File dumpDir) { |
| synchronized (sLock) { |
| for (File file : dumpDir.listFiles()) { |
| file.delete(); |
| } |
| } |
| } |
| |
| private static File getDumpDir() { |
| final File dumpDir = new File(Environment.getDataMiscDirectory(), PREREBOOT_DIR); |
| if (!dumpDir.exists() || !dumpDir.isDirectory()) { |
| throw new UnsupportedOperationException("Pre-reboot dump directory not found"); |
| } |
| return dumpDir; |
| } |
| |
| @GuardedBy("sLock") |
| private static void dumpLogsLocked(@NonNull File dumpDir, @NonNull String buffer) { |
| try { |
| final File dumpFile = new File(dumpDir, buffer); |
| if (dumpFile.createNewFile()) { |
| dumpFile.setWritable(true /* writable */, true /* ownerOnly */); |
| } else { |
| // Wipes dumped information in existing file before recording new information. |
| new FileWriter(dumpFile, false).flush(); |
| } |
| |
| final String[] cmdline = |
| {"logcat", "-d", "-b", buffer, "-f", dumpFile.getAbsolutePath()}; |
| Runtime.getRuntime().exec(cmdline).waitFor(); |
| } catch (IOException | InterruptedException e) { |
| Slog.d(TAG, "Dump system log buffer before reboot fail", e); |
| } |
| } |
| |
| @GuardedBy("sLock") |
| private static void dumpServiceLocked(@NonNull File dumpDir, @NonNull String serviceName) { |
| final IBinder binder = ServiceManager.checkService(serviceName); |
| if (binder == null) { |
| return; |
| } |
| |
| try { |
| final File dumpFile = new File(dumpDir, serviceName); |
| final ParcelFileDescriptor fd = ParcelFileDescriptor.open(dumpFile, |
| ParcelFileDescriptor.MODE_CREATE | ParcelFileDescriptor.MODE_TRUNCATE |
| | ParcelFileDescriptor.MODE_WRITE_ONLY); |
| binder.dump(fd.getFileDescriptor(), ArrayUtils.emptyArray(String.class)); |
| } catch (FileNotFoundException | RemoteException e) { |
| Slog.d(TAG, String.format("Dump %s service before reboot fail", serviceName), e); |
| } |
| } |
| } |