Jerry Chang | 1f82347 | 2019-12-13 19:07:52 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2020 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package com.android.server.power; |
| 18 | |
| 19 | import android.annotation.NonNull; |
| 20 | import android.content.Context; |
| 21 | import android.os.Environment; |
| 22 | import android.os.IBinder; |
| 23 | import android.os.ParcelFileDescriptor; |
| 24 | import android.os.RemoteException; |
| 25 | import android.os.ServiceManager; |
| 26 | import android.provider.Settings; |
| 27 | import android.util.Slog; |
| 28 | |
| 29 | import com.android.internal.annotations.GuardedBy; |
| 30 | import com.android.internal.annotations.VisibleForTesting; |
| 31 | import com.android.internal.util.ArrayUtils; |
| 32 | |
| 33 | import java.io.File; |
| 34 | import java.io.FileNotFoundException; |
| 35 | import java.io.FileWriter; |
| 36 | import java.io.IOException; |
| 37 | |
| 38 | /** |
| 39 | * Provides utils to dump/wipe pre-reboot information. |
| 40 | */ |
| 41 | final class PreRebootLogger { |
| 42 | private static final String TAG = "PreRebootLogger"; |
| 43 | private static final String PREREBOOT_DIR = "prereboot"; |
| 44 | |
| 45 | private static final String[] BUFFERS_TO_DUMP = {"system"}; |
| 46 | private static final String[] SERVICES_TO_DUMP = {Context.ROLLBACK_SERVICE, "package"}; |
| 47 | |
| 48 | private static final Object sLock = new Object(); |
| 49 | |
| 50 | /** |
| 51 | * Process pre-reboot information. Dump pre-reboot information to {@link #PREREBOOT_DIR} if |
| 52 | * enabled {@link Settings.Global#ADB_ENABLED}; wipe dumped information otherwise. |
| 53 | */ |
| 54 | static void log(Context context) { |
| 55 | log(context, getDumpDir()); |
| 56 | } |
| 57 | |
| 58 | @VisibleForTesting |
| 59 | static void log(Context context, @NonNull File dumpDir) { |
| 60 | if (Settings.Global.getInt( |
| 61 | context.getContentResolver(), Settings.Global.ADB_ENABLED, 0) == 1) { |
| 62 | Slog.d(TAG, "Dumping pre-reboot information..."); |
| 63 | dump(dumpDir); |
| 64 | } else { |
| 65 | Slog.d(TAG, "Wiping pre-reboot information..."); |
| 66 | wipe(dumpDir); |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | private static void dump(@NonNull File dumpDir) { |
| 71 | synchronized (sLock) { |
| 72 | for (String buffer : BUFFERS_TO_DUMP) { |
| 73 | dumpLogsLocked(dumpDir, buffer); |
| 74 | } |
| 75 | for (String service : SERVICES_TO_DUMP) { |
| 76 | dumpServiceLocked(dumpDir, service); |
| 77 | } |
| 78 | } |
| 79 | } |
| 80 | |
| 81 | private static void wipe(@NonNull File dumpDir) { |
| 82 | synchronized (sLock) { |
| 83 | for (File file : dumpDir.listFiles()) { |
| 84 | file.delete(); |
| 85 | } |
| 86 | } |
| 87 | } |
| 88 | |
| 89 | private static File getDumpDir() { |
| 90 | final File dumpDir = new File(Environment.getDataMiscDirectory(), PREREBOOT_DIR); |
| 91 | if (!dumpDir.exists() || !dumpDir.isDirectory()) { |
| 92 | throw new UnsupportedOperationException("Pre-reboot dump directory not found"); |
| 93 | } |
| 94 | return dumpDir; |
| 95 | } |
| 96 | |
| 97 | @GuardedBy("sLock") |
| 98 | private static void dumpLogsLocked(@NonNull File dumpDir, @NonNull String buffer) { |
| 99 | try { |
| 100 | final File dumpFile = new File(dumpDir, buffer); |
| 101 | if (dumpFile.createNewFile()) { |
| 102 | dumpFile.setWritable(true /* writable */, true /* ownerOnly */); |
| 103 | } else { |
| 104 | // Wipes dumped information in existing file before recording new information. |
| 105 | new FileWriter(dumpFile, false).flush(); |
| 106 | } |
| 107 | |
| 108 | final String[] cmdline = |
| 109 | {"logcat", "-d", "-b", buffer, "-f", dumpFile.getAbsolutePath()}; |
| 110 | Runtime.getRuntime().exec(cmdline).waitFor(); |
| 111 | } catch (IOException | InterruptedException e) { |
| 112 | Slog.d(TAG, "Dump system log buffer before reboot fail", e); |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | @GuardedBy("sLock") |
| 117 | private static void dumpServiceLocked(@NonNull File dumpDir, @NonNull String serviceName) { |
| 118 | final IBinder binder = ServiceManager.checkService(serviceName); |
| 119 | if (binder == null) { |
| 120 | return; |
| 121 | } |
| 122 | |
| 123 | try { |
| 124 | final File dumpFile = new File(dumpDir, serviceName); |
| 125 | final ParcelFileDescriptor fd = ParcelFileDescriptor.open(dumpFile, |
| 126 | ParcelFileDescriptor.MODE_CREATE | ParcelFileDescriptor.MODE_TRUNCATE |
| 127 | | ParcelFileDescriptor.MODE_WRITE_ONLY); |
| 128 | binder.dump(fd.getFileDescriptor(), ArrayUtils.emptyArray(String.class)); |
| 129 | } catch (FileNotFoundException | RemoteException e) { |
| 130 | Slog.d(TAG, String.format("Dump %s service before reboot fail", serviceName), e); |
| 131 | } |
| 132 | } |
| 133 | } |