1 /* 2 * Copyright (C) 2009 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; 18 19 import android.content.BroadcastReceiver; 20 import android.content.Context; 21 import android.content.Intent; 22 import android.content.SharedPreferences; 23 import android.os.Build; 24 import android.os.DropBoxManager; 25 import android.os.FileObserver; 26 import android.os.FileUtils; 27 import android.os.RecoverySystem; 28 import android.os.SystemProperties; 29 import android.provider.Downloads; 30 import android.util.Slog; 31 32 import java.io.File; 33 import java.io.IOException; 34 35 /** 36 * Performs a number of miscellaneous, non-system-critical actions 37 * after the system has finished booting. 38 */ 39 public class BootReceiver extends BroadcastReceiver { 40 private static final String TAG = "BootReceiver"; 41 42 // Maximum size of a logged event (files get truncated if they're longer). 43 // Give userdebug builds a larger max to capture extra debug, esp. for last_kmsg. 44 private static final int LOG_SIZE = 45 SystemProperties.getInt("ro.debuggable", 0) == 1 ? 98304 : 65536; 46 47 private static final File TOMBSTONE_DIR = new File("/data/tombstones"); 48 49 // The pre-froyo package and class of the system updater, which 50 // ran in the system process. We need to remove its packages here 51 // in order to clean up after a pre-froyo-to-froyo update. 52 private static final String OLD_UPDATER_PACKAGE = 53 "com.google.android.systemupdater"; 54 private static final String OLD_UPDATER_CLASS = 55 "com.google.android.systemupdater.SystemUpdateReceiver"; 56 57 // Keep a reference to the observer so the finalizer doesn't disable it. 58 private static FileObserver sTombstoneObserver = null; 59 60 @Override 61 public void onReceive(final Context context, Intent intent) { 62 // Log boot events in the background to avoid blocking the main thread with I/O 63 new Thread() { 64 @Override 65 public void run() { 66 try { 67 logBootEvents(context); 68 } catch (Exception e) { 69 Slog.e(TAG, "Can't log boot events", e); 70 } 71 try { 72 removeOldUpdatePackages(context); 73 } catch (Exception e) { 74 Slog.e(TAG, "Can't remove old update packages", e); 75 } 76 77 } 78 }.start(); 79 } 80 81 private void removeOldUpdatePackages(Context context) { 82 Downloads.removeAllDownloadsByPackage(context, OLD_UPDATER_PACKAGE, OLD_UPDATER_CLASS); 83 } 84 85 private void logBootEvents(Context ctx) throws IOException { 86 final DropBoxManager db = (DropBoxManager) ctx.getSystemService(Context.DROPBOX_SERVICE); 87 final SharedPreferences prefs = ctx.getSharedPreferences("log_files", Context.MODE_PRIVATE); 88 final String headers = new StringBuilder(512) 89 .append("Build: ").append(Build.FINGERPRINT).append("\n") 90 .append("Hardware: ").append(Build.BOARD).append("\n") 91 .append("Bootloader: ").append(Build.BOOTLOADER).append("\n") 92 .append("Radio: ").append(Build.RADIO).append("\n") 93 .append("Kernel: ") 94 .append(FileUtils.readTextFile(new File("/proc/version"), 1024, "...\n")) 95 .append("\n").toString(); 96 97 String recovery = RecoverySystem.handleAftermath(); 98 if (recovery != null && db != null) { 99 db.addText("SYSTEM_RECOVERY_LOG", headers + recovery); 100 } 101 102 if (SystemProperties.getLong("ro.runtime.firstboot", 0) == 0) { 103 String now = Long.toString(System.currentTimeMillis()); 104 SystemProperties.set("ro.runtime.firstboot", now); 105 if (db != null) db.addText("SYSTEM_BOOT", headers); 106 107 // Negative sizes mean to take the *tail* of the file (see FileUtils.readTextFile()) 108 addFileToDropBox(db, prefs, headers, "/proc/last_kmsg", 109 -LOG_SIZE, "SYSTEM_LAST_KMSG"); 110 addFileToDropBox(db, prefs, headers, "/cache/recovery/log", 111 -LOG_SIZE, "SYSTEM_RECOVERY_LOG"); 112 addFileToDropBox(db, prefs, headers, "/data/dontpanic/apanic_console", 113 -LOG_SIZE, "APANIC_CONSOLE"); 114 addFileToDropBox(db, prefs, headers, "/data/dontpanic/apanic_threads", 115 -LOG_SIZE, "APANIC_THREADS"); 116 } else { 117 if (db != null) db.addText("SYSTEM_RESTART", headers); 118 } 119 120 // Scan existing tombstones (in case any new ones appeared) 121 File[] tombstoneFiles = TOMBSTONE_DIR.listFiles(); 122 for (int i = 0; tombstoneFiles != null && i < tombstoneFiles.length; i++) { 123 addFileToDropBox(db, prefs, headers, tombstoneFiles[i].getPath(), 124 LOG_SIZE, "SYSTEM_TOMBSTONE"); 125 } 126 127 // Start watching for new tombstone files; will record them as they occur. 128 // This gets registered with the singleton file observer thread. 129 sTombstoneObserver = new FileObserver(TOMBSTONE_DIR.getPath(), FileObserver.CLOSE_WRITE) { 130 @Override 131 public void onEvent(int event, String path) { 132 try { 133 String filename = new File(TOMBSTONE_DIR, path).getPath(); 134 addFileToDropBox(db, prefs, headers, filename, LOG_SIZE, "SYSTEM_TOMBSTONE"); 135 } catch (IOException e) { 136 Slog.e(TAG, "Can't log tombstone", e); 137 } 138 } 139 }; 140 141 sTombstoneObserver.startWatching(); 142 } 143 144 private static void addFileToDropBox( 145 DropBoxManager db, SharedPreferences prefs, 146 String headers, String filename, int maxSize, String tag) throws IOException { 147 if (db == null || !db.isTagEnabled(tag)) return; // Logging disabled 148 149 File file = new File(filename); 150 long fileTime = file.lastModified(); 151 if (fileTime <= 0) return; // File does not exist 152 153 if (prefs != null) { 154 long lastTime = prefs.getLong(filename, 0); 155 if (lastTime == fileTime) return; // Already logged this particular file 156 // TODO: move all these SharedPreferences Editor commits 157 // outside this function to the end of logBootEvents 158 prefs.edit().putLong(filename, fileTime).apply(); 159 } 160 161 Slog.i(TAG, "Copying " + filename + " to DropBox (" + tag + ")"); 162 db.addText(tag, headers + FileUtils.readTextFile(file, maxSize, "[[TRUNCATED]]\n")); 163 } 164 } 165
