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LeafOS / LeafOS-Project / android_frameworks_base / 9d39d0cb361c5d3bba04a6bacf299be2162a6e92 / . / services / java / com / android / server / BackupManagerService.java
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/*
* Copyright (C) 2009 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;
import android.app.ActivityManagerNative;
import android.app.AlarmManager;
import android.app.AppGlobals;
import android.app.IActivityManager;
import android.app.IApplicationThread;
import android.app.IBackupAgent;
import android.app.PendingIntent;
import android.app.backup.RestoreSet;
import android.app.backup.IBackupManager;
import android.app.backup.IRestoreObserver;
import android.app.backup.IRestoreSession;
import android.content.BroadcastReceiver;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.ServiceConnection;
import android.content.pm.ApplicationInfo;
import android.content.pm.IPackageDataObserver;
import android.content.pm.IPackageManager;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.Signature;
import android.content.pm.PackageManager.NameNotFoundException;
import android.net.Uri;
import android.os.Binder;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.IBinder;
import android.os.Looper;
import android.os.Message;
import android.os.ParcelFileDescriptor;
import android.os.PowerManager;
import android.os.Process;
import android.os.RemoteException;
import android.os.SystemClock;
import android.provider.Settings;
import android.util.EventLog;
import android.util.Slog;
import android.util.SparseArray;
import android.util.SparseIntArray;
import com.android.internal.backup.BackupConstants;
import com.android.internal.backup.IBackupTransport;
import com.android.internal.backup.LocalTransport;
import com.android.server.PackageManagerBackupAgent.Metadata;
import java.io.EOFException;
import java.io.File;
import java.io.FileDescriptor;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.RandomAccessFile;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Random;
import java.util.Set;
class BackupManagerService extends IBackupManager.Stub {
private static final String TAG = "BackupManagerService";
private static final boolean DEBUG = false;
// How often we perform a backup pass. Privileged external callers can
// trigger an immediate pass.
private static final long BACKUP_INTERVAL = AlarmManager.INTERVAL_HOUR;
// Random variation in backup scheduling time to avoid server load spikes
private static final int FUZZ_MILLIS = 5 * 60 * 1000;
// The amount of time between the initial provisioning of the device and
// the first backup pass.
private static final long FIRST_BACKUP_INTERVAL = 12 * AlarmManager.INTERVAL_HOUR;
private static final String RUN_BACKUP_ACTION = "android.app.backup.intent.RUN";
private static final String RUN_INITIALIZE_ACTION = "android.app.backup.intent.INIT";
private static final String RUN_CLEAR_ACTION = "android.app.backup.intent.CLEAR";
private static final int MSG_RUN_BACKUP = 1;
private static final int MSG_RUN_FULL_BACKUP = 2;
private static final int MSG_RUN_RESTORE = 3;
private static final int MSG_RUN_CLEAR = 4;
private static final int MSG_RUN_INITIALIZE = 5;
private static final int MSG_RUN_GET_RESTORE_SETS = 6;
private static final int MSG_TIMEOUT = 7;
// Timeout interval for deciding that a bind or clear-data has taken too long
static final long TIMEOUT_INTERVAL = 10 * 1000;
// Timeout intervals for agent backup & restore operations
static final long TIMEOUT_BACKUP_INTERVAL = 30 * 1000;
static final long TIMEOUT_RESTORE_INTERVAL = 60 * 1000;
private Context mContext;
private PackageManager mPackageManager;
IPackageManager mPackageManagerBinder;
private IActivityManager mActivityManager;
private PowerManager mPowerManager;
private AlarmManager mAlarmManager;
IBackupManager mBackupManagerBinder;
boolean mEnabled; // access to this is synchronized on 'this'
boolean mProvisioned;
boolean mAutoRestore;
PowerManager.WakeLock mWakelock;
HandlerThread mHandlerThread = new HandlerThread("backup", Process.THREAD_PRIORITY_BACKGROUND);
BackupHandler mBackupHandler;
PendingIntent mRunBackupIntent, mRunInitIntent;
BroadcastReceiver mRunBackupReceiver, mRunInitReceiver;
// map UIDs to the set of backup client services within that UID's app set
final SparseArray<HashSet<ApplicationInfo>> mBackupParticipants
= new SparseArray<HashSet<ApplicationInfo>>();
// set of backup services that have pending changes
class BackupRequest {
public ApplicationInfo appInfo;
public boolean fullBackup;
BackupRequest(ApplicationInfo app, boolean isFull) {
appInfo = app;
fullBackup = isFull;
}
public String toString() {
return "BackupRequest{app=" + appInfo + " full=" + fullBackup + "}";
}
}
// Backups that we haven't started yet.
HashMap<ApplicationInfo,BackupRequest> mPendingBackups
= new HashMap<ApplicationInfo,BackupRequest>();
// Pseudoname that we use for the Package Manager metadata "package"
static final String PACKAGE_MANAGER_SENTINEL = "@pm@";
// locking around the pending-backup management
final Object mQueueLock = new Object();
// The thread performing the sequence of queued backups binds to each app's agent
// in succession. Bind notifications are asynchronously delivered through the
// Activity Manager; use this lock object to signal when a requested binding has
// completed.
final Object mAgentConnectLock = new Object();
IBackupAgent mConnectedAgent;
volatile boolean mConnecting;
volatile long mLastBackupPass;
volatile long mNextBackupPass;
// A similar synchronization mechanism around clearing apps' data for restore
final Object mClearDataLock = new Object();
volatile boolean mClearingData;
// Transport bookkeeping
final HashMap<String,IBackupTransport> mTransports
= new HashMap<String,IBackupTransport>();
String mCurrentTransport;
IBackupTransport mLocalTransport, mGoogleTransport;
ActiveRestoreSession mActiveRestoreSession;
class RestoreGetSetsParams {
public IBackupTransport transport;
public ActiveRestoreSession session;
public IRestoreObserver observer;
RestoreGetSetsParams(IBackupTransport _transport, ActiveRestoreSession _session,
IRestoreObserver _observer) {
transport = _transport;
session = _session;
observer = _observer;
}
}
class RestoreParams {
public IBackupTransport transport;
public IRestoreObserver observer;
public long token;
public PackageInfo pkgInfo;
public int pmToken; // in post-install restore, the PM's token for this transaction
RestoreParams(IBackupTransport _transport, IRestoreObserver _obs,
long _token, PackageInfo _pkg, int _pmToken) {
transport = _transport;
observer = _obs;
token = _token;
pkgInfo = _pkg;
pmToken = _pmToken;
}
RestoreParams(IBackupTransport _transport, IRestoreObserver _obs, long _token) {
transport = _transport;
observer = _obs;
token = _token;
pkgInfo = null;
pmToken = 0;
}
}
class ClearParams {
public IBackupTransport transport;
public PackageInfo packageInfo;
ClearParams(IBackupTransport _transport, PackageInfo _info) {
transport = _transport;
packageInfo = _info;
}
}
// Bookkeeping of in-flight operations for timeout etc. purposes. The operation
// token is the index of the entry in the pending-operations list.
static final int OP_PENDING = 0;
static final int OP_ACKNOWLEDGED = 1;
static final int OP_TIMEOUT = -1;
final SparseIntArray mCurrentOperations = new SparseIntArray();
final Object mCurrentOpLock = new Object();
final Random mTokenGenerator = new Random();
// Where we keep our journal files and other bookkeeping
File mBaseStateDir;
File mDataDir;
File mJournalDir;
File mJournal;
// Keep a log of all the apps we've ever backed up, and what the
// dataset tokens are for both the current backup dataset and
// the ancestral dataset.
private File mEverStored;
HashSet<String> mEverStoredApps = new HashSet<String>();
static final int CURRENT_ANCESTRAL_RECORD_VERSION = 1; // increment when the schema changes
File mTokenFile;
Set<String> mAncestralPackages = null;
long mAncestralToken = 0;
long mCurrentToken = 0;
// Persistently track the need to do a full init
static final String INIT_SENTINEL_FILE_NAME = "_need_init_";
HashSet<String> mPendingInits = new HashSet<String>(); // transport names
// ----- Asynchronous backup/restore handler thread -----
private class BackupHandler extends Handler {
public BackupHandler(Looper looper) {
super(looper);
}
public void handleMessage(Message msg) {
switch (msg.what) {
case MSG_RUN_BACKUP:
{
mLastBackupPass = System.currentTimeMillis();
mNextBackupPass = mLastBackupPass + BACKUP_INTERVAL;
IBackupTransport transport = getTransport(mCurrentTransport);
if (transport == null) {
Slog.v(TAG, "Backup requested but no transport available");
mWakelock.release();
break;
}
// snapshot the pending-backup set and work on that
ArrayList<BackupRequest> queue = new ArrayList<BackupRequest>();
File oldJournal = mJournal;
synchronized (mQueueLock) {
// Do we have any work to do? Construct the work queue
// then release the synchronization lock to actually run
// the backup.
if (mPendingBackups.size() > 0) {
for (BackupRequest b: mPendingBackups.values()) {
queue.add(b);
}
if (DEBUG) Slog.v(TAG, "clearing pending backups");
mPendingBackups.clear();
// Start a new backup-queue journal file too
mJournal = null;
}
}
if (queue.size() > 0) {
// At this point, we have started a new journal file, and the old
// file identity is being passed to the backup processing thread.
// When it completes successfully, that old journal file will be
// deleted. If we crash prior to that, the old journal is parsed
// at next boot and the journaled requests fulfilled.
(new PerformBackupTask(transport, queue, oldJournal)).run();
} else {
Slog.v(TAG, "Backup requested but nothing pending");
mWakelock.release();
}
break;
}
case MSG_RUN_FULL_BACKUP:
break;
case MSG_RUN_RESTORE:
{
RestoreParams params = (RestoreParams)msg.obj;
Slog.d(TAG, "MSG_RUN_RESTORE observer=" + params.observer);
(new PerformRestoreTask(params.transport, params.observer,
params.token, params.pkgInfo, params.pmToken)).run();
break;
}
case MSG_RUN_CLEAR:
{
ClearParams params = (ClearParams)msg.obj;
(new PerformClearTask(params.transport, params.packageInfo)).run();
break;
}
case MSG_RUN_INITIALIZE:
{
HashSet<String> queue;
// Snapshot the pending-init queue and work on that
synchronized (mQueueLock) {
queue = new HashSet<String>(mPendingInits);
mPendingInits.clear();
}
(new PerformInitializeTask(queue)).run();
break;
}
case MSG_RUN_GET_RESTORE_SETS:
{
// Like other async operations, this is entered with the wakelock held
RestoreSet[] sets = null;
RestoreGetSetsParams params = (RestoreGetSetsParams)msg.obj;
try {
sets = params.transport.getAvailableRestoreSets();
// cache the result in the active session
synchronized (params.session) {
params.session.mRestoreSets = sets;
}
if (sets == null) EventLog.writeEvent(EventLogTags.RESTORE_TRANSPORT_FAILURE);
} catch (Exception e) {
Slog.e(TAG, "Error from transport getting set list");
} finally {
if (params.observer != null) {
try {
params.observer.restoreSetsAvailable(sets);
} catch (RemoteException re) {
Slog.e(TAG, "Unable to report listing to observer");
} catch (Exception e) {
Slog.e(TAG, "Restore observer threw", e);
}
}
mWakelock.release();
}
break;
}
case MSG_TIMEOUT:
{
synchronized (mCurrentOpLock) {
final int token = msg.arg1;
int state = mCurrentOperations.get(token, OP_TIMEOUT);
if (state == OP_PENDING) {
if (DEBUG) Slog.v(TAG, "TIMEOUT: token=" + token);
mCurrentOperations.put(token, OP_TIMEOUT);
}
mCurrentOpLock.notifyAll();
}
break;
}
}
}
}
// ----- Main service implementation -----
public BackupManagerService(Context context) {
mContext = context;
mPackageManager = context.getPackageManager();
mPackageManagerBinder = AppGlobals.getPackageManager();
mActivityManager = ActivityManagerNative.getDefault();
mAlarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
mPowerManager = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
mBackupManagerBinder = asInterface(asBinder());
// spin up the backup/restore handler thread
mHandlerThread = new HandlerThread("backup", Process.THREAD_PRIORITY_BACKGROUND);
mHandlerThread.start();
mBackupHandler = new BackupHandler(mHandlerThread.getLooper());
// Set up our bookkeeping
boolean areEnabled = Settings.Secure.getInt(context.getContentResolver(),
Settings.Secure.BACKUP_ENABLED, 0) != 0;
mProvisioned = Settings.Secure.getInt(context.getContentResolver(),
Settings.Secure.BACKUP_PROVISIONED, 0) != 0;
mAutoRestore = Settings.Secure.getInt(context.getContentResolver(),
Settings.Secure.BACKUP_AUTO_RESTORE, 1) != 0;
// If Encrypted file systems is enabled or disabled, this call will return the
// correct directory.
mBaseStateDir = new File(Environment.getSecureDataDirectory(), "backup");
mBaseStateDir.mkdirs();
mDataDir = Environment.getDownloadCacheDirectory();
// Alarm receivers for scheduled backups & initialization operations
mRunBackupReceiver = new RunBackupReceiver();
IntentFilter filter = new IntentFilter();
filter.addAction(RUN_BACKUP_ACTION);
context.registerReceiver(mRunBackupReceiver, filter,
android.Manifest.permission.BACKUP, null);
mRunInitReceiver = new RunInitializeReceiver();
filter = new IntentFilter();
filter.addAction(RUN_INITIALIZE_ACTION);
context.registerReceiver(mRunInitReceiver, filter,
android.Manifest.permission.BACKUP, null);
Intent backupIntent = new Intent(RUN_BACKUP_ACTION);
backupIntent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY);
mRunBackupIntent = PendingIntent.getBroadcast(context, MSG_RUN_BACKUP, backupIntent, 0);
Intent initIntent = new Intent(RUN_INITIALIZE_ACTION);
backupIntent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY);
mRunInitIntent = PendingIntent.getBroadcast(context, MSG_RUN_INITIALIZE, initIntent, 0);
// Set up the backup-request journaling
mJournalDir = new File(mBaseStateDir, "pending");
mJournalDir.mkdirs(); // creates mBaseStateDir along the way
mJournal = null; // will be created on first use
// Set up the various sorts of package tracking we do
initPackageTracking();
// Build our mapping of uid to backup client services. This implicitly
// schedules a backup pass on the Package Manager metadata the first
// time anything needs to be backed up.
synchronized (mBackupParticipants) {
addPackageParticipantsLocked(null);
}
// Set up our transport options and initialize the default transport
// TODO: Have transports register themselves somehow?
// TODO: Don't create transports that we don't need to?
mLocalTransport = new LocalTransport(context); // This is actually pretty cheap
ComponentName localName = new ComponentName(context, LocalTransport.class);
registerTransport(localName.flattenToShortString(), mLocalTransport);
mGoogleTransport = null;
mCurrentTransport = Settings.Secure.getString(context.getContentResolver(),
Settings.Secure.BACKUP_TRANSPORT);
if ("".equals(mCurrentTransport)) {
mCurrentTransport = null;
}
if (DEBUG) Slog.v(TAG, "Starting with transport " + mCurrentTransport);
// Attach to the Google backup transport. When this comes up, it will set
// itself as the current transport because we explicitly reset mCurrentTransport
// to null.
ComponentName transportComponent = new ComponentName("com.google.android.backup",
"com.google.android.backup.BackupTransportService");
try {
// If there's something out there that is supposed to be the Google
// backup transport, make sure it's legitimately part of the OS build
// and not an app lying about its package name.
ApplicationInfo info = mPackageManager.getApplicationInfo(
transportComponent.getPackageName(), 0);
if ((info.flags & ApplicationInfo.FLAG_SYSTEM) != 0) {
if (DEBUG) Slog.v(TAG, "Binding to Google transport");
Intent intent = new Intent().setComponent(transportComponent);
context.bindService(intent, mGoogleConnection, Context.BIND_AUTO_CREATE);
} else {
Slog.w(TAG, "Possible Google transport spoof: ignoring " + info);
}
} catch (PackageManager.NameNotFoundException nnf) {
// No such package? No binding.
if (DEBUG) Slog.v(TAG, "Google transport not present");
}
// Now that we know about valid backup participants, parse any
// leftover journal files into the pending backup set
parseLeftoverJournals();
// Power management
mWakelock = mPowerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "backup");
// Start the backup passes going
setBackupEnabled(areEnabled);
}
private class RunBackupReceiver extends BroadcastReceiver {
public void onReceive(Context context, Intent intent) {
if (RUN_BACKUP_ACTION.equals(intent.getAction())) {
synchronized (mQueueLock) {
if (mPendingInits.size() > 0) {
// If there are pending init operations, we process those
// and then settle into the usual periodic backup schedule.
if (DEBUG) Slog.v(TAG, "Init pending at scheduled backup");
try {
mAlarmManager.cancel(mRunInitIntent);
mRunInitIntent.send();
} catch (PendingIntent.CanceledException ce) {
Slog.e(TAG, "Run init intent cancelled");
// can't really do more than bail here
}
} else {
// Don't run backups now if we're disabled or not yet
// fully set up.
if (mEnabled && mProvisioned) {
if (DEBUG) Slog.v(TAG, "Running a backup pass");
// Acquire the wakelock and pass it to the backup thread. it will
// be released once backup concludes.
mWakelock.acquire();
Message msg = mBackupHandler.obtainMessage(MSG_RUN_BACKUP);
mBackupHandler.sendMessage(msg);
} else {
Slog.w(TAG, "Backup pass but e=" + mEnabled + " p=" + mProvisioned);
}
}
}
}
}
}
private class RunInitializeReceiver extends BroadcastReceiver {
public void onReceive(Context context, Intent intent) {
if (RUN_INITIALIZE_ACTION.equals(intent.getAction())) {
synchronized (mQueueLock) {
if (DEBUG) Slog.v(TAG, "Running a device init");
// Acquire the wakelock and pass it to the init thread. it will
// be released once init concludes.
mWakelock.acquire();
Message msg = mBackupHandler.obtainMessage(MSG_RUN_INITIALIZE);
mBackupHandler.sendMessage(msg);
}
}
}
}
private void initPackageTracking() {
if (DEBUG) Slog.v(TAG, "Initializing package tracking");
// Remember our ancestral dataset
mTokenFile = new File(mBaseStateDir, "ancestral");
try {
RandomAccessFile tf = new RandomAccessFile(mTokenFile, "r");
int version = tf.readInt();
if (version == CURRENT_ANCESTRAL_RECORD_VERSION) {
mAncestralToken = tf.readLong();
mCurrentToken = tf.readLong();
int numPackages = tf.readInt();
if (numPackages >= 0) {
mAncestralPackages = new HashSet<String>();
for (int i = 0; i < numPackages; i++) {
String pkgName = tf.readUTF();
mAncestralPackages.add(pkgName);
}
}
}
} catch (FileNotFoundException fnf) {
// Probably innocuous
Slog.v(TAG, "No ancestral data");
} catch (IOException e) {
Slog.w(TAG, "Unable to read token file", e);
}
// Keep a log of what apps we've ever backed up. Because we might have
// rebooted in the middle of an operation that was removing something from
// this log, we sanity-check its contents here and reconstruct it.
mEverStored = new File(mBaseStateDir, "processed");
File tempProcessedFile = new File(mBaseStateDir, "processed.new");
// If we were in the middle of removing something from the ever-backed-up
// file, there might be a transient "processed.new" file still present.
// Ignore it -- we'll validate "processed" against the current package set.
if (tempProcessedFile.exists()) {
tempProcessedFile.delete();
}
// If there are previous contents, parse them out then start a new
// file to continue the recordkeeping.
if (mEverStored.exists()) {
RandomAccessFile temp = null;
RandomAccessFile in = null;
try {
temp = new RandomAccessFile(tempProcessedFile, "rws");
in = new RandomAccessFile(mEverStored, "r");
while (true) {
PackageInfo info;
String pkg = in.readUTF();
try {
info = mPackageManager.getPackageInfo(pkg, 0);
mEverStoredApps.add(pkg);
temp.writeUTF(pkg);
if (DEBUG) Slog.v(TAG, " + " + pkg);
} catch (NameNotFoundException e) {
// nope, this package was uninstalled; don't include it
if (DEBUG) Slog.v(TAG, " - " + pkg);
}
}
} catch (EOFException e) {
// Once we've rewritten the backup history log, atomically replace the
// old one with the new one then reopen the file for continuing use.
if (!tempProcessedFile.renameTo(mEverStored)) {
Slog.e(TAG, "Error renaming " + tempProcessedFile + " to " + mEverStored);
}
} catch (IOException e) {
Slog.e(TAG, "Error in processed file", e);
} finally {
try { if (temp != null) temp.close(); } catch (IOException e) {}
try { if (in != null) in.close(); } catch (IOException e) {}
}
}
// Register for broadcasts about package install, etc., so we can
// update the provider list.
IntentFilter filter = new IntentFilter();
filter.addAction(Intent.ACTION_PACKAGE_ADDED);
filter.addAction(Intent.ACTION_PACKAGE_REMOVED);
filter.addDataScheme("package");
mContext.registerReceiver(mBroadcastReceiver, filter);
// Register for events related to sdcard installation.
IntentFilter sdFilter = new IntentFilter();
sdFilter.addAction(Intent.ACTION_EXTERNAL_APPLICATIONS_AVAILABLE);
sdFilter.addAction(Intent.ACTION_EXTERNAL_APPLICATIONS_UNAVAILABLE);
mContext.registerReceiver(mBroadcastReceiver, sdFilter);
}
private void parseLeftoverJournals() {
for (File f : mJournalDir.listFiles()) {
if (mJournal == null || f.compareTo(mJournal) != 0) {
// This isn't the current journal, so it must be a leftover. Read
// out the package names mentioned there and schedule them for
// backup.
RandomAccessFile in = null;
try {
Slog.i(TAG, "Found stale backup journal, scheduling:");
in = new RandomAccessFile(f, "r");
while (true) {
String packageName = in.readUTF();
Slog.i(TAG, " + " + packageName);
dataChanged(packageName);
}
} catch (EOFException e) {
// no more data; we're done
} catch (Exception e) {
Slog.e(TAG, "Can't read " + f, e);
} finally {
// close/delete the file
try { if (in != null) in.close(); } catch (IOException e) {}
f.delete();
}
}
}
}
// Maintain persistent state around whether need to do an initialize operation.
// Must be called with the queue lock held.
void recordInitPendingLocked(boolean isPending, String transportName) {
if (DEBUG) Slog.i(TAG, "recordInitPendingLocked: " + isPending
+ " on transport " + transportName);
try {
IBackupTransport transport = getTransport(transportName);
String transportDirName = transport.transportDirName();
File stateDir = new File(mBaseStateDir, transportDirName);
File initPendingFile = new File(stateDir, INIT_SENTINEL_FILE_NAME);
if (isPending) {
// We need an init before we can proceed with sending backup data.
// Record that with an entry in our set of pending inits, as well as
// journaling it via creation of a sentinel file.
mPendingInits.add(transportName);
try {
(new FileOutputStream(initPendingFile)).close();
} catch (IOException ioe) {
// Something is badly wrong with our permissions; just try to move on
}
} else {
// No more initialization needed; wipe the journal and reset our state.
initPendingFile.delete();
mPendingInits.remove(transportName);
}
} catch (RemoteException e) {
// can't happen; the transport is local
}
}
// Reset all of our bookkeeping, in response to having been told that
// the backend data has been wiped [due to idle expiry, for example],
// so we must re-upload all saved settings.
void resetBackupState(File stateFileDir) {
synchronized (mQueueLock) {
// Wipe the "what we've ever backed up" tracking
mEverStoredApps.clear();
mEverStored.delete();
mCurrentToken = 0;
writeRestoreTokens();
// Remove all the state files
for (File sf : stateFileDir.listFiles()) {
// ... but don't touch the needs-init sentinel
if (!sf.getName().equals(INIT_SENTINEL_FILE_NAME)) {
sf.delete();
}
}
// Enqueue a new backup of every participant
int N = mBackupParticipants.size();
for (int i=0; i<N; i++) {
int uid = mBackupParticipants.keyAt(i);
HashSet<ApplicationInfo> participants = mBackupParticipants.valueAt(i);
for (ApplicationInfo app: participants) {
dataChanged(app.packageName);
}
}
}
}
// Add a transport to our set of available backends. If 'transport' is null, this
// is an unregistration, and the transport's entry is removed from our bookkeeping.
private void registerTransport(String name, IBackupTransport transport) {
synchronized (mTransports) {
if (DEBUG) Slog.v(TAG, "Registering transport " + name + " = " + transport);
if (transport != null) {
mTransports.put(name, transport);
} else {
mTransports.remove(name);
if ((mCurrentTransport != null) && mCurrentTransport.equals(name)) {
mCurrentTransport = null;
}
// Nothing further to do in the unregistration case
return;
}
}
// If the init sentinel file exists, we need to be sure to perform the init
// as soon as practical. We also create the state directory at registration
// time to ensure it's present from the outset.
try {
String transportName = transport.transportDirName();
File stateDir = new File(mBaseStateDir, transportName);
stateDir.mkdirs();
File initSentinel = new File(stateDir, INIT_SENTINEL_FILE_NAME);
if (initSentinel.exists()) {
synchronized (mQueueLock) {
mPendingInits.add(transportName);
// TODO: pick a better starting time than now + 1 minute
long delay = 1000 * 60; // one minute, in milliseconds
mAlarmManager.set(AlarmManager.RTC_WAKEUP,
System.currentTimeMillis() + delay, mRunInitIntent);
}
}
} catch (RemoteException e) {
// can't happen, the transport is local
}
}
// ----- Track installation/removal of packages -----
BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
if (DEBUG) Slog.d(TAG, "Received broadcast " + intent);
String action = intent.getAction();
boolean replacing = false;
boolean added = false;
Bundle extras = intent.getExtras();
String pkgList[] = null;
if (Intent.ACTION_PACKAGE_ADDED.equals(action) ||
Intent.ACTION_PACKAGE_REMOVED.equals(action)) {
Uri uri = intent.getData();
if (uri == null) {
return;
}
String pkgName = uri.getSchemeSpecificPart();
if (pkgName != null) {
pkgList = new String[] { pkgName };
}
added = Intent.ACTION_PACKAGE_ADDED.equals(action);
replacing = extras.getBoolean(Intent.EXTRA_REPLACING, false);
} else if (Intent.ACTION_EXTERNAL_APPLICATIONS_AVAILABLE.equals(action)) {
added = true;
pkgList = intent.getStringArrayExtra(Intent.EXTRA_CHANGED_PACKAGE_LIST);
} else if (Intent.ACTION_EXTERNAL_APPLICATIONS_UNAVAILABLE.equals(action)) {
added = false;
pkgList = intent.getStringArrayExtra(Intent.EXTRA_CHANGED_PACKAGE_LIST);
}
if (pkgList == null || pkgList.length == 0) {
return;
}
if (added) {
synchronized (mBackupParticipants) {
for (String pkgName : pkgList) {
if (replacing) {
// The package was just upgraded
updatePackageParticipantsLocked(pkgName);
} else {
// The package was just added
addPackageParticipantsLocked(pkgName);
}
}
}
} else {
if (replacing) {
// The package is being updated. We'll receive a PACKAGE_ADDED shortly.
} else {
synchronized (mBackupParticipants) {
for (String pkgName : pkgList) {
removePackageParticipantsLocked(pkgName);
}
}
}
}
}
};
// ----- Track connection to GoogleBackupTransport service -----
ServiceConnection mGoogleConnection = new ServiceConnection() {
public void onServiceConnected(ComponentName name, IBinder service) {
if (DEBUG) Slog.v(TAG, "Connected to Google transport");
mGoogleTransport = IBackupTransport.Stub.asInterface(service);
registerTransport(name.flattenToShortString(), mGoogleTransport);
}
public void onServiceDisconnected(ComponentName name) {
if (DEBUG) Slog.v(TAG, "Disconnected from Google transport");
mGoogleTransport = null;
registerTransport(name.flattenToShortString(), null);
}
};
// Add the backup agents in the given package to our set of known backup participants.
// If 'packageName' is null, adds all backup agents in the whole system.
void addPackageParticipantsLocked(String packageName) {
// Look for apps that define the android:backupAgent attribute
if (DEBUG) Slog.v(TAG, "addPackageParticipantsLocked: " + packageName);
List<PackageInfo> targetApps = allAgentPackages();
addPackageParticipantsLockedInner(packageName, targetApps);
}
private void addPackageParticipantsLockedInner(String packageName,
List<PackageInfo> targetPkgs) {
if (DEBUG) {
Slog.v(TAG, "Adding " + targetPkgs.size() + " backup participants:");
for (PackageInfo p : targetPkgs) {
Slog.v(TAG, " " + p + " agent=" + p.applicationInfo.backupAgentName
+ " uid=" + p.applicationInfo.uid
+ " killAfterRestore="
+ (((p.applicationInfo.flags & ApplicationInfo.FLAG_KILL_AFTER_RESTORE) != 0) ? "true" : "false")
);
}
}
for (PackageInfo pkg : targetPkgs) {
if (packageName == null || pkg.packageName.equals(packageName)) {
int uid = pkg.applicationInfo.uid;
HashSet<ApplicationInfo> set = mBackupParticipants.get(uid);
if (set == null) {
set = new HashSet<ApplicationInfo>();
mBackupParticipants.put(uid, set);
}
set.add(pkg.applicationInfo);
// If we've never seen this app before, schedule a backup for it
if (!mEverStoredApps.contains(pkg.packageName)) {
if (DEBUG) Slog.i(TAG, "New app " + pkg.packageName
+ " never backed up; scheduling");
dataChanged(pkg.packageName);
}
}
}
}
// Remove the given package's entry from our known active set. If
// 'packageName' is null, *all* participating apps will be removed.
void removePackageParticipantsLocked(String packageName) {
if (DEBUG) Slog.v(TAG, "removePackageParticipantsLocked: " + packageName);
List<PackageInfo> allApps = null;
if (packageName != null) {
allApps = new ArrayList<PackageInfo>();
try {
int flags = PackageManager.GET_SIGNATURES;
allApps.add(mPackageManager.getPackageInfo(packageName, flags));
} catch (Exception e) {
// just skip it (???)
}
} else {
// all apps with agents
allApps = allAgentPackages();
}
removePackageParticipantsLockedInner(packageName, allApps);
}
private void removePackageParticipantsLockedInner(String packageName,
List<PackageInfo> agents) {
if (DEBUG) {
Slog.v(TAG, "removePackageParticipantsLockedInner (" + packageName
+ ") removing " + agents.size() + " entries");
for (PackageInfo p : agents) {
Slog.v(TAG, " - " + p);
}
}
for (PackageInfo pkg : agents) {
if (packageName == null || pkg.packageName.equals(packageName)) {
int uid = pkg.applicationInfo.uid;
HashSet<ApplicationInfo> set = mBackupParticipants.get(uid);
if (set != null) {
// Find the existing entry with the same package name, and remove it.
// We can't just remove(app) because the instances are different.
for (ApplicationInfo entry: set) {
if (entry.packageName.equals(pkg.packageName)) {
set.remove(entry);
removeEverBackedUp(pkg.packageName);
break;
}
}
if (set.size() == 0) {
mBackupParticipants.delete(uid);
}
}
}
}
}
// Returns the set of all applications that define an android:backupAgent attribute
List<PackageInfo> allAgentPackages() {
// !!! TODO: cache this and regenerate only when necessary
int flags = PackageManager.GET_SIGNATURES;
List<PackageInfo> packages = mPackageManager.getInstalledPackages(flags);
int N = packages.size();
for (int a = N-1; a >= 0; a--) {
PackageInfo pkg = packages.get(a);
try {
ApplicationInfo app = pkg.applicationInfo;
if (((app.flags&ApplicationInfo.FLAG_ALLOW_BACKUP) == 0)
|| app.backupAgentName == null) {
packages.remove(a);
}
else {
// we will need the shared library path, so look that up and store it here
app = mPackageManager.getApplicationInfo(pkg.packageName,
PackageManager.GET_SHARED_LIBRARY_FILES);
pkg.applicationInfo.sharedLibraryFiles = app.sharedLibraryFiles;
}
} catch (NameNotFoundException e) {
packages.remove(a);
}
}
return packages;
}
// Reset the given package's known backup participants. Unlike add/remove, the update
// action cannot be passed a null package name.
void updatePackageParticipantsLocked(String packageName) {
if (packageName == null) {
Slog.e(TAG, "updatePackageParticipants called with null package name");
return;
}
if (DEBUG) Slog.v(TAG, "updatePackageParticipantsLocked: " + packageName);
// brute force but small code size
List<PackageInfo> allApps = allAgentPackages();
removePackageParticipantsLockedInner(packageName, allApps);
addPackageParticipantsLockedInner(packageName, allApps);
}
// Called from the backup task: record that the given app has been successfully
// backed up at least once
void logBackupComplete(String packageName) {
if (packageName.equals(PACKAGE_MANAGER_SENTINEL)) return;
synchronized (mEverStoredApps) {
if (!mEverStoredApps.add(packageName)) return;
RandomAccessFile out = null;
try {
out = new RandomAccessFile(mEverStored, "rws");
out.seek(out.length());
out.writeUTF(packageName);
} catch (IOException e) {
Slog.e(TAG, "Can't log backup of " + packageName + " to " + mEverStored);
} finally {
try { if (out != null) out.close(); } catch (IOException e) {}
}
}
}
// Remove our awareness of having ever backed up the given package
void removeEverBackedUp(String packageName) {
if (DEBUG) Slog.v(TAG, "Removing backed-up knowledge of " + packageName + ", new set:");
synchronized (mEverStoredApps) {
// Rewrite the file and rename to overwrite. If we reboot in the middle,
// we'll recognize on initialization time that the package no longer
// exists and fix it up then.
File tempKnownFile = new File(mBaseStateDir, "processed.new");
RandomAccessFile known = null;
try {
known = new RandomAccessFile(tempKnownFile, "rws");
mEverStoredApps.remove(packageName);
for (String s : mEverStoredApps) {
known.writeUTF(s);
if (DEBUG) Slog.v(TAG, " " + s);
}
known.close();
known = null;
if (!tempKnownFile.renameTo(mEverStored)) {
throw new IOException("Can't rename " + tempKnownFile + " to " + mEverStored);
}
} catch (IOException e) {
// Bad: we couldn't create the new copy. For safety's sake we
// abandon the whole process and remove all what's-backed-up
// state entirely, meaning we'll force a backup pass for every
// participant on the next boot or [re]install.
Slog.w(TAG, "Error rewriting " + mEverStored, e);
mEverStoredApps.clear();
tempKnownFile.delete();
mEverStored.delete();
} finally {
try { if (known != null) known.close(); } catch (IOException e) {}
}
}
}
// Persistently record the current and ancestral backup tokens as well
// as the set of packages with data [supposedly] available in the
// ancestral dataset.
void writeRestoreTokens() {
try {
RandomAccessFile af = new RandomAccessFile(mTokenFile, "rwd");
// First, the version number of this record, for futureproofing
af.writeInt(CURRENT_ANCESTRAL_RECORD_VERSION);
// Write the ancestral and current tokens
af.writeLong(mAncestralToken);
af.writeLong(mCurrentToken);
// Now write the set of ancestral packages
if (mAncestralPackages == null) {
af.writeInt(-1);
} else {
af.writeInt(mAncestralPackages.size());
if (DEBUG) Slog.v(TAG, "Ancestral packages: " + mAncestralPackages.size());
for (String pkgName : mAncestralPackages) {
af.writeUTF(pkgName);
if (DEBUG) Slog.v(TAG, " " + pkgName);
}
}
af.close();
} catch (IOException e) {
Slog.w(TAG, "Unable to write token file:", e);
}
}
// Return the given transport
private IBackupTransport getTransport(String transportName) {
synchronized (mTransports) {
IBackupTransport transport = mTransports.get(transportName);
if (transport == null) {
Slog.w(TAG, "Requested unavailable transport: " + transportName);
}
return transport;
}
}
// fire off a backup agent, blocking until it attaches or times out
IBackupAgent bindToAgentSynchronous(ApplicationInfo app, int mode) {
IBackupAgent agent = null;
synchronized(mAgentConnectLock) {
mConnecting = true;
mConnectedAgent = null;
try {
if (mActivityManager.bindBackupAgent(app, mode)) {
Slog.d(TAG, "awaiting agent for " + app);
// success; wait for the agent to arrive
// only wait 10 seconds for the clear data to happen
long timeoutMark = System.currentTimeMillis() + TIMEOUT_INTERVAL;
while (mConnecting && mConnectedAgent == null
&& (System.currentTimeMillis() < timeoutMark)) {
try {
mAgentConnectLock.wait(5000);
} catch (InterruptedException e) {
// just bail
return null;
}
}
// if we timed out with no connect, abort and move on
if (mConnecting == true) {
Slog.w(TAG, "Timeout waiting for agent " + app);
return null;
}
agent = mConnectedAgent;
}
} catch (RemoteException e) {
// can't happen
}
}
return agent;
}
// clear an application's data, blocking until the operation completes or times out
void clearApplicationDataSynchronous(String packageName) {
// Don't wipe packages marked allowClearUserData=false
try {
PackageInfo info = mPackageManager.getPackageInfo(packageName, 0);
if ((info.applicationInfo.flags & ApplicationInfo.FLAG_ALLOW_CLEAR_USER_DATA) == 0) {
if (DEBUG) Slog.i(TAG, "allowClearUserData=false so not wiping "
+ packageName);
return;
}
} catch (NameNotFoundException e) {
Slog.w(TAG, "Tried to clear data for " + packageName + " but not found");
return;
}
ClearDataObserver observer = new ClearDataObserver();
synchronized(mClearDataLock) {
mClearingData = true;
try {
mActivityManager.clearApplicationUserData(packageName, observer);
} catch (RemoteException e) {
// can't happen because the activity manager is in this process
}
// only wait 10 seconds for the clear data to happen
long timeoutMark = System.currentTimeMillis() + TIMEOUT_INTERVAL;
while (mClearingData && (System.currentTimeMillis() < timeoutMark)) {
try {
mClearDataLock.wait(5000);
} catch (InterruptedException e) {
// won't happen, but still.
mClearingData = false;
}
}
}
}
class ClearDataObserver extends IPackageDataObserver.Stub {
public void onRemoveCompleted(String packageName, boolean succeeded) {
synchronized(mClearDataLock) {
mClearingData = false;
mClearDataLock.notifyAll();
}
}
}
// Get the restore-set token for the best-available restore set for this package:
// the active set if possible, else the ancestral one. Returns zero if none available.
long getAvailableRestoreToken(String packageName) {
long token = mAncestralToken;
synchronized (mQueueLock) {
if (mEverStoredApps.contains(packageName)) {
token = mCurrentToken;
}
}
return token;
}
// -----
// Utility methods used by the asynchronous-with-timeout backup/restore operations
boolean waitUntilOperationComplete(int token) {
int finalState = OP_PENDING;
synchronized (mCurrentOpLock) {
try {
while ((finalState = mCurrentOperations.get(token, OP_TIMEOUT)) == OP_PENDING) {
try {
mCurrentOpLock.wait();
} catch (InterruptedException e) {}
}
} catch (IndexOutOfBoundsException e) {
// the operation has been mysteriously cleared from our
// bookkeeping -- consider this a success and ignore it.
}
}
mBackupHandler.removeMessages(MSG_TIMEOUT);
if (DEBUG) Slog.v(TAG, "operation " + Integer.toHexString(token)
+ " complete: finalState=" + finalState);
return finalState == OP_ACKNOWLEDGED;
}
void prepareOperationTimeout(int token, long interval) {
if (DEBUG) Slog.v(TAG, "starting timeout: token=" + Integer.toHexString(token)
+ " interval=" + interval);
mCurrentOperations.put(token, OP_PENDING);
Message msg = mBackupHandler.obtainMessage(MSG_TIMEOUT, token, 0);
mBackupHandler.sendMessageDelayed(msg, interval);
}
// ----- Back up a set of applications via a worker thread -----
class PerformBackupTask implements Runnable {
private static final String TAG = "PerformBackupThread";
IBackupTransport mTransport;
ArrayList<BackupRequest> mQueue;
File mStateDir;
File mJournal;
public PerformBackupTask(IBackupTransport transport, ArrayList<BackupRequest> queue,
File journal) {
mTransport = transport;
mQueue = queue;
mJournal = journal;
try {
mStateDir = new File(mBaseStateDir, transport.transportDirName());
} catch (RemoteException e) {
// can't happen; the transport is local
}
}
public void run() {
int status = BackupConstants.TRANSPORT_OK;
long startRealtime = SystemClock.elapsedRealtime();
if (DEBUG) Slog.v(TAG, "Beginning backup of " + mQueue.size() + " targets");
// Backups run at background priority
Process.setThreadPriority(Process.THREAD_PRIORITY_BACKGROUND);
try {
EventLog.writeEvent(EventLogTags.BACKUP_START, mTransport.transportDirName());
// If we haven't stored package manager metadata yet, we must init the transport.
File pmState = new File(mStateDir, PACKAGE_MANAGER_SENTINEL);
if (status == BackupConstants.TRANSPORT_OK && pmState.length() <= 0) {
Slog.i(TAG, "Initializing (wiping) backup state and transport storage");
resetBackupState(mStateDir); // Just to make sure.
status = mTransport.initializeDevice();
if (status == BackupConstants.TRANSPORT_OK) {
EventLog.writeEvent(EventLogTags.BACKUP_INITIALIZE);
} else {
EventLog.writeEvent(EventLogTags.BACKUP_TRANSPORT_FAILURE, "(initialize)");
Slog.e(TAG, "Transport error in initializeDevice()");
}
}
// The package manager doesn't have a proper <application> etc, but since
// it's running here in the system process we can just set up its agent
// directly and use a synthetic BackupRequest. We always run this pass
// because it's cheap and this way we guarantee that we don't get out of
// step even if we're selecting among various transports at run time.
if (status == BackupConstants.TRANSPORT_OK) {
PackageManagerBackupAgent pmAgent = new PackageManagerBackupAgent(
mPackageManager, allAgentPackages());
BackupRequest pmRequest = new BackupRequest(new ApplicationInfo(), false);
pmRequest.appInfo.packageName = PACKAGE_MANAGER_SENTINEL;
status = processOneBackup(pmRequest,
IBackupAgent.Stub.asInterface(pmAgent.onBind()), mTransport);
}
if (status == BackupConstants.TRANSPORT_OK) {
// Now run all the backups in our queue
status = doQueuedBackups(mTransport);
}
if (status == BackupConstants.TRANSPORT_OK) {
// Tell the transport to finish everything it has buffered
status = mTransport.finishBackup();
if (status == BackupConstants.TRANSPORT_OK) {
int millis = (int) (SystemClock.elapsedRealtime() - startRealtime);
EventLog.writeEvent(EventLogTags.BACKUP_SUCCESS, mQueue.size(), millis);
} else {
EventLog.writeEvent(EventLogTags.BACKUP_TRANSPORT_FAILURE, "(finish)");
Slog.e(TAG, "Transport error in finishBackup()");
}
}
if (status == BackupConstants.TRANSPORT_NOT_INITIALIZED) {
// The backend reports that our dataset has been wiped. We need to
// reset all of our bookkeeping and instead run a new backup pass for
// everything.
EventLog.writeEvent(EventLogTags.BACKUP_RESET, mTransport.transportDirName());
resetBackupState(mStateDir);
}
} catch (Exception e) {
Slog.e(TAG, "Error in backup thread", e);
status = BackupConstants.TRANSPORT_ERROR;
} finally {
// If everything actually went through and this is the first time we've
// done a backup, we can now record what the current backup dataset token
// is.
if ((mCurrentToken == 0) && (status != BackupConstants.TRANSPORT_OK)) {
try {
mCurrentToken = mTransport.getCurrentRestoreSet();
} catch (RemoteException e) { /* cannot happen */ }
writeRestoreTokens();
}
// If things went wrong, we need to re-stage the apps we had expected
// to be backing up in this pass. This journals the package names in
// the current active pending-backup file, not in the we are holding
// here in mJournal.
if (status != BackupConstants.TRANSPORT_OK) {
Slog.w(TAG, "Backup pass unsuccessful, restaging");
for (BackupRequest req : mQueue) {
dataChanged(req.appInfo.packageName);
}
// We also want to reset the backup schedule based on whatever
// the transport suggests by way of retry/backoff time.
try {
startBackupAlarmsLocked(mTransport.requestBackupTime());
} catch (RemoteException e) { /* cannot happen */ }
}
// Either backup was successful, in which case we of course do not need
// this pass's journal any more; or it failed, in which case we just
// re-enqueued all of these packages in the current active journal.
// Either way, we no longer need this pass's journal.
if (mJournal != null && !mJournal.delete()) {
Slog.e(TAG, "Unable to remove backup journal file " + mJournal);
}
// Only once we're entirely finished do we release the wakelock
if (status == BackupConstants.TRANSPORT_NOT_INITIALIZED) {
backupNow();
}
mWakelock.release();
}
}
private int doQueuedBackups(IBackupTransport transport) {
for (BackupRequest request : mQueue) {
Slog.d(TAG, "starting agent for backup of " + request);
IBackupAgent agent = null;
int mode = (request.fullBackup)
? IApplicationThread.BACKUP_MODE_FULL
: IApplicationThread.BACKUP_MODE_INCREMENTAL;
try {
agent = bindToAgentSynchronous(request.appInfo, mode);
if (agent != null) {
int result = processOneBackup(request, agent, transport);
if (result != BackupConstants.TRANSPORT_OK) return result;
}
} catch (SecurityException ex) {
// Try for the next one.
Slog.d(TAG, "error in bind/backup", ex);
} finally {
try { // unbind even on timeout, just in case
mActivityManager.unbindBackupAgent(request.appInfo);
} catch (RemoteException e) {}
}
}
return BackupConstants.TRANSPORT_OK;
}
private int processOneBackup(BackupRequest request, IBackupAgent agent,
IBackupTransport transport) {
final String packageName = request.appInfo.packageName;
if (DEBUG) Slog.d(TAG, "processOneBackup doBackup() on " + packageName);
File savedStateName = new File(mStateDir, packageName);
File backupDataName = new File(mDataDir, packageName + ".data");
File newStateName = new File(mStateDir, packageName + ".new");
ParcelFileDescriptor savedState = null;
ParcelFileDescriptor backupData = null;
ParcelFileDescriptor newState = null;
PackageInfo packInfo;
int token = mTokenGenerator.nextInt();
try {
// Look up the package info & signatures. This is first so that if it
// throws an exception, there's no file setup yet that would need to
// be unraveled.
if (packageName.equals(PACKAGE_MANAGER_SENTINEL)) {
// The metadata 'package' is synthetic
packInfo = new PackageInfo();
packInfo.packageName = packageName;
} else {
packInfo = mPackageManager.getPackageInfo(packageName,
PackageManager.GET_SIGNATURES);
}
// In a full backup, we pass a null ParcelFileDescriptor as
// the saved-state "file"
if (!request.fullBackup) {
savedState = ParcelFileDescriptor.open(savedStateName,
ParcelFileDescriptor.MODE_READ_ONLY |
ParcelFileDescriptor.MODE_CREATE); // Make an empty file if necessary
}
backupData = ParcelFileDescriptor.open(backupDataName,
ParcelFileDescriptor.MODE_READ_WRITE |
ParcelFileDescriptor.MODE_CREATE |
ParcelFileDescriptor.MODE_TRUNCATE);
newState = ParcelFileDescriptor.open(newStateName,
ParcelFileDescriptor.MODE_READ_WRITE |
ParcelFileDescriptor.MODE_CREATE |
ParcelFileDescriptor.MODE_TRUNCATE);
// Initiate the target's backup pass
prepareOperationTimeout(token, TIMEOUT_BACKUP_INTERVAL);
agent.doBackup(savedState, backupData, newState, token, mBackupManagerBinder);
boolean success = waitUntilOperationComplete(token);
if (!success) {
// timeout -- bail out into the failed-transaction logic
throw new RuntimeException("Backup timeout");
}
logBackupComplete(packageName);
if (DEBUG) Slog.v(TAG, "doBackup() success");
} catch (Exception e) {
Slog.e(TAG, "Error backing up " + packageName, e);
EventLog.writeEvent(EventLogTags.BACKUP_AGENT_FAILURE, packageName, e.toString());
backupDataName.delete();
newStateName.delete();
return BackupConstants.TRANSPORT_ERROR;
} finally {
try { if (savedState != null) savedState.close(); } catch (IOException e) {}
try { if (backupData != null) backupData.close(); } catch (IOException e) {}
try { if (newState != null) newState.close(); } catch (IOException e) {}
savedState = backupData = newState = null;
synchronized (mCurrentOpLock) {
mCurrentOperations.clear();
}
}
// Now propagate the newly-backed-up data to the transport
int result = BackupConstants.TRANSPORT_OK;
try {
int size = (int) backupDataName.length();
if (size > 0) {
if (result == BackupConstants.TRANSPORT_OK) {
backupData = ParcelFileDescriptor.open(backupDataName,
ParcelFileDescriptor.MODE_READ_ONLY);
result = transport.performBackup(packInfo, backupData);
}
// TODO - We call finishBackup() for each application backed up, because
// we need to know now whether it succeeded or failed. Instead, we should
// hold off on finishBackup() until the end, which implies holding off on
// renaming *all* the output state files (see below) until that happens.
if (result == BackupConstants.TRANSPORT_OK) {
result = transport.finishBackup();
}
} else {
if (DEBUG) Slog.i(TAG, "no backup data written; not calling transport");
}
// After successful transport, delete the now-stale data
// and juggle the files so that next time we supply the agent
// with the new state file it just created.
if (result == BackupConstants.TRANSPORT_OK) {
backupDataName.delete();
newStateName.renameTo(savedStateName);
EventLog.writeEvent(EventLogTags.BACKUP_PACKAGE, packageName, size);
} else {
EventLog.writeEvent(EventLogTags.BACKUP_TRANSPORT_FAILURE, packageName);
}
} catch (Exception e) {
Slog.e(TAG, "Transport error backing up " + packageName, e);
EventLog.writeEvent(EventLogTags.BACKUP_TRANSPORT_FAILURE, packageName);
result = BackupConstants.TRANSPORT_ERROR;
} finally {
try { if (backupData != null) backupData.close(); } catch (IOException e) {}
}
return result;
}
}
// ----- Restore handling -----
private boolean signaturesMatch(Signature[] storedSigs, PackageInfo target) {
// If the target resides on the system partition, we allow it to restore
// data from the like-named package in a restore set even if the signatures
// do not match. (Unlike general applications, those flashed to the system
// partition will be signed with the device's platform certificate, so on
// different phones the same system app will have different signatures.)
if ((target.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0) {
if (DEBUG) Slog.v(TAG, "System app " + target.packageName + " - skipping sig check");
return true;
}
// Allow unsigned apps, but not signed on one device and unsigned on the other
// !!! TODO: is this the right policy?
Signature[] deviceSigs = target.signatures;
if (DEBUG) Slog.v(TAG, "signaturesMatch(): stored=" + storedSigs
+ " device=" + deviceSigs);
if ((storedSigs == null || storedSigs.length == 0)
&& (deviceSigs == null || deviceSigs.length == 0)) {
return true;
}
if (storedSigs == null || deviceSigs == null) {
return false;
}
// !!! TODO: this demands that every stored signature match one
// that is present on device, and does not demand the converse.
// Is this this right policy?
int nStored = storedSigs.length;
int nDevice = deviceSigs.length;
for (int i=0; i < nStored; i++) {
boolean match = false;
for (int j=0; j < nDevice; j++) {
if (storedSigs[i].equals(deviceSigs[j])) {
match = true;
break;
}
}
if (!match) {
return false;
}
}
return true;
}
class PerformRestoreTask implements Runnable {
private IBackupTransport mTransport;
private IRestoreObserver mObserver;
private long mToken;
private PackageInfo mTargetPackage;
private File mStateDir;
private int mPmToken;
class RestoreRequest {
public PackageInfo app;
public int storedAppVersion;
RestoreRequest(PackageInfo _app, int _version) {
app = _app;
storedAppVersion = _version;
}
}
PerformRestoreTask(IBackupTransport transport, IRestoreObserver observer,
long restoreSetToken, PackageInfo targetPackage, int pmToken) {
mTransport = transport;
mObserver = observer;
mToken = restoreSetToken;
mTargetPackage = targetPackage;
mPmToken = pmToken;
try {
mStateDir = new File(mBaseStateDir, transport.transportDirName());
} catch (RemoteException e) {
// can't happen; the transport is local
}
}
public void run() {
long startRealtime = SystemClock.elapsedRealtime();
if (DEBUG) Slog.v(TAG, "Beginning restore process mTransport=" + mTransport
+ " mObserver=" + mObserver + " mToken=" + Long.toHexString(mToken)
+ " mTargetPackage=" + mTargetPackage + " mPmToken=" + mPmToken);
PackageManagerBackupAgent pmAgent = null;
int error = -1; // assume error
// build the set of apps to restore
try {
// TODO: Log this before getAvailableRestoreSets, somehow
EventLog.writeEvent(EventLogTags.RESTORE_START, mTransport.transportDirName(), mToken);
// Get the list of all packages which have backup enabled.
// (Include the Package Manager metadata pseudo-package first.)
ArrayList<PackageInfo> restorePackages = new ArrayList<PackageInfo>();
PackageInfo omPackage = new PackageInfo();
omPackage.packageName = PACKAGE_MANAGER_SENTINEL;
restorePackages.add(omPackage);
List<PackageInfo> agentPackages = allAgentPackages();
if (mTargetPackage == null) {
restorePackages.addAll(agentPackages);
} else {
// Just one package to attempt restore of
restorePackages.add(mTargetPackage);
}
// let the observer know that we're running
if (mObserver != null) {
try {
// !!! TODO: get an actual count from the transport after
// its startRestore() runs?
mObserver.restoreStarting(restorePackages.size());
} catch (RemoteException e) {
Slog.d(TAG, "Restore observer died at restoreStarting");
mObserver = null;
}
}
if (mTransport.startRestore(mToken, restorePackages.toArray(new PackageInfo[0])) !=
BackupConstants.TRANSPORT_OK) {
Slog.e(TAG, "Error starting restore operation");
EventLog.writeEvent(EventLogTags.RESTORE_TRANSPORT_FAILURE);
return;
}
String packageName = mTransport.nextRestorePackage();
if (packageName == null) {
Slog.e(TAG, "Error getting first restore package");
EventLog.writeEvent(EventLogTags.RESTORE_TRANSPORT_FAILURE);
return;
} else if (packageName.equals("")) {
Slog.i(TAG, "No restore data available");
int millis = (int) (SystemClock.elapsedRealtime() - startRealtime);
EventLog.writeEvent(EventLogTags.RESTORE_SUCCESS, 0, millis);
return;
} else if (!packageName.equals(PACKAGE_MANAGER_SENTINEL)) {
Slog.e(TAG, "Expected restore data for \"" + PACKAGE_MANAGER_SENTINEL
+ "\", found only \"" + packageName + "\"");
EventLog.writeEvent(EventLogTags.RESTORE_AGENT_FAILURE, PACKAGE_MANAGER_SENTINEL,
"Package manager data missing");
return;
}
// Pull the Package Manager metadata from the restore set first
pmAgent = new PackageManagerBackupAgent(
mPackageManager, agentPackages);
processOneRestore(omPackage, 0, IBackupAgent.Stub.asInterface(pmAgent.onBind()));
// Verify that the backup set includes metadata. If not, we can't do
// signature/version verification etc, so we simply do not proceed with
// the restore operation.
if (!pmAgent.hasMetadata()) {
Slog.e(TAG, "No restore metadata available, so not restoring settings");
EventLog.writeEvent(EventLogTags.RESTORE_AGENT_FAILURE, PACKAGE_MANAGER_SENTINEL,
"Package manager restore metadata missing");
return;
}
int count = 0;
for (;;) {
packageName = mTransport.nextRestorePackage();
if (packageName == null) {
Slog.e(TAG, "Error getting next restore package");
EventLog.writeEvent(EventLogTags.RESTORE_TRANSPORT_FAILURE);
return;
} else if (packageName.equals("")) {
if (DEBUG) Slog.v(TAG, "No next package, finishing restore");
break;
}
if (mObserver != null) {
try {
mObserver.onUpdate(count, packageName);
} catch (RemoteException e) {
Slog.d(TAG, "Restore observer died in onUpdate");
mObserver = null;
}
}
Metadata metaInfo = pmAgent.getRestoredMetadata(packageName);
if (metaInfo == null) {
Slog.e(TAG, "Missing metadata for " + packageName);
EventLog.writeEvent(EventLogTags.RESTORE_AGENT_FAILURE, packageName,
"Package metadata missing");
continue;
}
PackageInfo packageInfo;
try {
int flags = PackageManager.GET_SIGNATURES;
packageInfo = mPackageManager.getPackageInfo(packageName, flags);
} catch (NameNotFoundException e) {
Slog.e(TAG, "Invalid package restoring data", e);
EventLog.writeEvent(EventLogTags.RESTORE_AGENT_FAILURE, packageName,
"Package missing on device");
continue;
}
if (metaInfo.versionCode > packageInfo.versionCode) {
// Data is from a "newer" version of the app than we have currently
// installed. If the app has not declared that it is prepared to
// handle this case, we do not attempt the restore.
if ((packageInfo.applicationInfo.flags
& ApplicationInfo.FLAG_RESTORE_ANY_VERSION) == 0) {
String message = "Version " + metaInfo.versionCode
+ " > installed version " + packageInfo.versionCode;
Slog.w(TAG, "Package " + packageName + ": " + message);
EventLog.writeEvent(EventLogTags.RESTORE_AGENT_FAILURE,
packageName, message);
continue;
} else {
if (DEBUG) Slog.v(TAG, "Version " + metaInfo.versionCode
+ " > installed " + packageInfo.versionCode
+ " but restoreAnyVersion");
}
}
if (!signaturesMatch(metaInfo.signatures, packageInfo)) {
Slog.w(TAG, "Signature mismatch restoring " + packageName);
EventLog.writeEvent(EventLogTags.RESTORE_AGENT_FAILURE, packageName,
"Signature mismatch");
continue;
}
if (DEBUG) Slog.v(TAG, "Package " + packageName
+ " restore version [" + metaInfo.versionCode
+ "] is compatible with installed version ["
+ packageInfo.versionCode + "]");
// Then set up and bind the agent
IBackupAgent agent = bindToAgentSynchronous(
packageInfo.applicationInfo,
IApplicationThread.BACKUP_MODE_INCREMENTAL);
if (agent == null) {
Slog.w(TAG, "Can't find backup agent for " + packageName);
EventLog.writeEvent(EventLogTags.RESTORE_AGENT_FAILURE, packageName,
"Restore agent missing");
continue;
}
// And then finally run the restore on this agent
try {
processOneRestore(packageInfo, metaInfo.versionCode, agent);
++count;
} finally {
// unbind and tidy up even on timeout or failure, just in case
mActivityManager.unbindBackupAgent(packageInfo.applicationInfo);
// The agent was probably running with a stub Application object,
// which isn't a valid run mode for the main app logic. Shut
// down the app so that next time it's launched, it gets the
// usual full initialization. Note that this is only done for
// full-system restores: when a single app has requested a restore,
// it is explicitly not killed following that operation.
if (mTargetPackage == null && (packageInfo.applicationInfo.flags
& ApplicationInfo.FLAG_KILL_AFTER_RESTORE) != 0) {
if (DEBUG) Slog.d(TAG, "Restore complete, killing host process of "
+ packageInfo.applicationInfo.processName);
mActivityManager.killApplicationProcess(
packageInfo.applicationInfo.processName,
packageInfo.applicationInfo.uid);
}
}
}
// if we get this far, report success to the observer
error = 0;
int millis = (int) (SystemClock.elapsedRealtime() - startRealtime);
EventLog.writeEvent(EventLogTags.RESTORE_SUCCESS, count, millis);
} catch (Exception e) {
Slog.e(TAG, "Error in restore thread", e);
} finally {
if (DEBUG) Slog.d(TAG, "finishing restore mObserver=" + mObserver);
try {
mTransport.finishRestore();
} catch (RemoteException e) {
Slog.e(TAG, "Error finishing restore", e);
}
if (mObserver != null) {
try {
mObserver.restoreFinished(error);
} catch (RemoteException e) {
Slog.d(TAG, "Restore observer died at restoreFinished");
}
}
// If this was a restoreAll operation, record that this was our
// ancestral dataset, as well as the set of apps that are possibly
// restoreable from the dataset
if (mTargetPackage == null && pmAgent != null) {
mAncestralPackages = pmAgent.getRestoredPackages();
mAncestralToken = mToken;
writeRestoreTokens();
}
// We must under all circumstances tell the Package Manager to
// proceed with install notifications if it's waiting for us.
if (mPmToken > 0) {
if (DEBUG) Slog.v(TAG, "finishing PM token " + mPmToken);
try {
mPackageManagerBinder.finishPackageInstall(mPmToken);
} catch (RemoteException e) { /* can't happen */ }
}
// done; we can finally release the wakelock
mWakelock.release();
}
}
// Do the guts of a restore of one application, using mTransport.getRestoreData().
void processOneRestore(PackageInfo app, int appVersionCode, IBackupAgent agent) {
// !!! TODO: actually run the restore through mTransport
final String packageName = app.packageName;
if (DEBUG) Slog.d(TAG, "processOneRestore packageName=" + packageName);
// !!! TODO: get the dirs from the transport
File backupDataName = new File(mDataDir, packageName + ".restore");
File newStateName = new File(mStateDir, packageName + ".new");
File savedStateName = new File(mStateDir, packageName);
ParcelFileDescriptor backupData = null;
ParcelFileDescriptor newState = null;
int token = mTokenGenerator.nextInt();
try {
// Run the transport's restore pass
backupData = ParcelFileDescriptor.open(backupDataName,
ParcelFileDescriptor.MODE_READ_WRITE |
ParcelFileDescriptor.MODE_CREATE |
ParcelFileDescriptor.MODE_TRUNCATE);
if (mTransport.getRestoreData(backupData) != BackupConstants.TRANSPORT_OK) {
Slog.e(TAG, "Error getting restore data for " + packageName);
EventLog.writeEvent(EventLogTags.RESTORE_TRANSPORT_FAILURE);
return;
}
// Okay, we have the data. Now have the agent do the restore.
backupData.close();
backupData = ParcelFileDescriptor.open(backupDataName,
ParcelFileDescriptor.MODE_READ_ONLY);
newState = ParcelFileDescriptor.open(newStateName,
ParcelFileDescriptor.MODE_READ_WRITE |
ParcelFileDescriptor.MODE_CREATE |
ParcelFileDescriptor.MODE_TRUNCATE);
// Kick off the restore, checking for hung agents
prepareOperationTimeout(token, TIMEOUT_RESTORE_INTERVAL);
agent.doRestore(backupData, appVersionCode, newState, token, mBackupManagerBinder);
boolean success = waitUntilOperationComplete(token);
if (!success) {
throw new RuntimeException("restore timeout");
}
// if everything went okay, remember the recorded state now
//
// !!! TODO: the restored data should be migrated on the server
// side into the current dataset. In that case the new state file
// we just created would reflect the data already extant in the
// backend, so there'd be nothing more to do. Until that happens,
// however, we need to make sure that we record the data to the
// current backend dataset. (Yes, this means shipping the data over
// the wire in both directions. That's bad, but consistency comes
// first, then efficiency.) Once we introduce server-side data
// migration to the newly-restored device's dataset, we will change
// the following from a discard of the newly-written state to the
// "correct" operation of renaming into the canonical state blob.
newStateName.delete(); // TODO: remove; see above comment
//newStateName.renameTo(savedStateName); // TODO: replace with this
int size = (int) backupDataName.length();
EventLog.writeEvent(EventLogTags.RESTORE_PACKAGE, packageName, size);
} catch (Exception e) {
Slog.e(TAG, "Error restoring data for " + packageName, e);
EventLog.writeEvent(EventLogTags.RESTORE_AGENT_FAILURE, packageName, e.toString());
// If the agent fails restore, it might have put the app's data
// into an incoherent state. For consistency we wipe its data
// again in this case before propagating the exception
clearApplicationDataSynchronous(packageName);
} finally {
backupDataName.delete();
try { if (backupData != null) backupData.close(); } catch (IOException e) {}
try { if (newState != null) newState.close(); } catch (IOException e) {}
backupData = newState = null;
mCurrentOperations.delete(token);
}
}
}
class PerformClearTask implements Runnable {
IBackupTransport mTransport;
PackageInfo mPackage;
PerformClearTask(IBackupTransport transport, PackageInfo packageInfo) {
mTransport = transport;
mPackage = packageInfo;
}
public void run() {
try {
// Clear the on-device backup state to ensure a full backup next time
File stateDir = new File(mBaseStateDir, mTransport.transportDirName());
File stateFile = new File(stateDir, mPackage.packageName);
stateFile.delete();
// Tell the transport to remove all the persistent storage for the app
// TODO - need to handle failures
mTransport.clearBackupData(mPackage);
} catch (RemoteException e) {
// can't happen; the transport is local
} finally {
try {
// TODO - need to handle failures
mTransport.finishBackup();
} catch (RemoteException e) {
// can't happen; the transport is local
}
// Last but not least, release the cpu
mWakelock.release();
}
}
}
class PerformInitializeTask implements Runnable {
HashSet<String> mQueue;
PerformInitializeTask(HashSet<String> transportNames) {
mQueue = transportNames;
}
public void run() {
try {
for (String transportName : mQueue) {
IBackupTransport transport = getTransport(transportName);
if (transport == null) {
Slog.e(TAG, "Requested init for " + transportName + " but not found");
continue;
}
Slog.i(TAG, "Initializing (wiping) backup transport storage: " + transportName);
EventLog.writeEvent(EventLogTags.BACKUP_START, transport.transportDirName());
long startRealtime = SystemClock.elapsedRealtime();
int status = transport.initializeDevice();
if (status == BackupConstants.TRANSPORT_OK) {
status = transport.finishBackup();
}
// Okay, the wipe really happened. Clean up our local bookkeeping.
if (status == BackupConstants.TRANSPORT_OK) {
Slog.i(TAG, "Device init successful");
int millis = (int) (SystemClock.elapsedRealtime() - startRealtime);
EventLog.writeEvent(EventLogTags.BACKUP_INITIALIZE);
resetBackupState(new File(mBaseStateDir, transport.transportDirName()));
EventLog.writeEvent(EventLogTags.BACKUP_SUCCESS, 0, millis);
synchronized (mQueueLock) {
recordInitPendingLocked(false, transportName);
}
} else {
// If this didn't work, requeue this one and try again
// after a suitable interval
Slog.e(TAG, "Transport error in initializeDevice()");
EventLog.writeEvent(EventLogTags.BACKUP_TRANSPORT_FAILURE, "(initialize)");
synchronized (mQueueLock) {
recordInitPendingLocked(true, transportName);
}
// do this via another alarm to make sure of the wakelock states
long delay = transport.requestBackupTime();
if (DEBUG) Slog.w(TAG, "init failed on "
+ transportName + " resched in " + delay);
mAlarmManager.set(AlarmManager.RTC_WAKEUP,
System.currentTimeMillis() + delay, mRunInitIntent);
}
}
} catch (RemoteException e) {
// can't happen; the transports are local
} catch (Exception e) {
Slog.e(TAG, "Unexpected error performing init", e);
} finally {
// Done; release the wakelock
mWakelock.release();
}
}
}
// ----- IBackupManager binder interface -----
public void dataChanged(String packageName) {
// Record that we need a backup pass for the caller. Since multiple callers
// may share a uid, we need to note all candidates within that uid and schedule
// a backup pass for each of them.
EventLog.writeEvent(EventLogTags.BACKUP_DATA_CHANGED, packageName);
// If the caller does not hold the BACKUP permission, it can only request a
// backup of its own data.
HashSet<ApplicationInfo> targets;
if ((mContext.checkPermission(android.Manifest.permission.BACKUP, Binder.getCallingPid(),
Binder.getCallingUid())) == PackageManager.PERMISSION_DENIED) {
targets = mBackupParticipants.get(Binder.getCallingUid());
} else {
// a caller with full permission can ask to back up any participating app
// !!! TODO: allow backup of ANY app?
targets = new HashSet<ApplicationInfo>();
int N = mBackupParticipants.size();
for (int i = 0; i < N; i++) {
HashSet<ApplicationInfo> s = mBackupParticipants.valueAt(i);
if (s != null) {
targets.addAll(s);
}
}
}
if (targets != null) {
synchronized (mQueueLock) {
// Note that this client has made data changes that need to be backed up
for (ApplicationInfo app : targets) {
// validate the caller-supplied package name against the known set of
// packages associated with this uid
if (app.packageName.equals(packageName)) {
// Add the caller to the set of pending backups. If there is
// one already there, then overwrite it, but no harm done.
BackupRequest req = new BackupRequest(app, false);
if (mPendingBackups.put(app, req) == null) {
// Journal this request in case of crash. The put()
// operation returned null when this package was not already
// in the set; we want to avoid touching the disk redundantly.
writeToJournalLocked(packageName);
if (DEBUG) {
int numKeys = mPendingBackups.size();
Slog.d(TAG, "Now awaiting backup for " + numKeys + " participants:");
for (BackupRequest b : mPendingBackups.values()) {
Slog.d(TAG, " + " + b + " agent=" + b.appInfo.backupAgentName);
}
}
}
}
}
}
} else {
Slog.w(TAG, "dataChanged but no participant pkg='" + packageName + "'"
+ " uid=" + Binder.getCallingUid());
}
}
private void writeToJournalLocked(String str) {
RandomAccessFile out = null;
try {
if (mJournal == null) mJournal = File.createTempFile("journal", null, mJournalDir);
out = new RandomAccessFile(mJournal, "rws");
out.seek(out.length());
out.writeUTF(str);
} catch (IOException e) {
Slog.e(TAG, "Can't write " + str + " to backup journal", e);
mJournal = null;
} finally {
try { if (out != null) out.close(); } catch (IOException e) {}
}
}
// Clear the given package's backup data from the current transport
public void clearBackupData(String packageName) {
if (DEBUG) Slog.v(TAG, "clearBackupData() of " + packageName);
PackageInfo info;
try {
info = mPackageManager.getPackageInfo(packageName, PackageManager.GET_SIGNATURES);
} catch (NameNotFoundException e) {
Slog.d(TAG, "No such package '" + packageName + "' - not clearing backup data");
return;
}
// If the caller does not hold the BACKUP permission, it can only request a
// wipe of its own backed-up data.
HashSet<ApplicationInfo> apps;
if ((mContext.checkPermission(android.Manifest.permission.BACKUP, Binder.getCallingPid(),
Binder.getCallingUid())) == PackageManager.PERMISSION_DENIED) {
apps = mBackupParticipants.get(Binder.getCallingUid());
} else {
// a caller with full permission can ask to back up any participating app
// !!! TODO: allow data-clear of ANY app?
if (DEBUG) Slog.v(TAG, "Privileged caller, allowing clear of other apps");
apps = new HashSet<ApplicationInfo>();
int N = mBackupParticipants.size();
for (int i = 0; i < N; i++) {
HashSet<ApplicationInfo> s = mBackupParticipants.valueAt(i);
if (s != null) {
apps.addAll(s);
}
}
}
// now find the given package in the set of candidate apps
for (ApplicationInfo app : apps) {
if (app.packageName.equals(packageName)) {
if (DEBUG) Slog.v(TAG, "Found the app - running clear process");
// found it; fire off the clear request
synchronized (mQueueLock) {
long oldId = Binder.clearCallingIdentity();
mWakelock.acquire();
Message msg = mBackupHandler.obtainMessage(MSG_RUN_CLEAR,
new ClearParams(getTransport(mCurrentTransport), info));
mBackupHandler.sendMessage(msg);
Binder.restoreCallingIdentity(oldId);
}
break;
}
}
}
// Run a backup pass immediately for any applications that have declared
// that they have pending updates.
public void backupNow() {
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.BACKUP, "backupNow");
if (DEBUG) Slog.v(TAG, "Scheduling immediate backup pass");
synchronized (mQueueLock) {
// Because the alarms we are using can jitter, and we want an *immediate*
// backup pass to happen, we restart the timer beginning with "next time,"
// then manually fire the backup trigger intent ourselves.
startBackupAlarmsLocked(BACKUP_INTERVAL);
try {
mRunBackupIntent.send();
} catch (PendingIntent.CanceledException e) {
// should never happen
Slog.e(TAG, "run-backup intent cancelled!");
}
}
}
// Enable/disable the backup service
public void setBackupEnabled(boolean enable) {
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.BACKUP,
"setBackupEnabled");
Slog.i(TAG, "Backup enabled => " + enable);
boolean wasEnabled = mEnabled;
synchronized (this) {
Settings.Secure.putInt(mContext.getContentResolver(),
Settings.Secure.BACKUP_ENABLED, enable ? 1 : 0);
mEnabled = enable;
}
synchronized (mQueueLock) {
if (enable && !wasEnabled && mProvisioned) {
// if we've just been enabled, start scheduling backup passes
startBackupAlarmsLocked(BACKUP_INTERVAL);
} else if (!enable) {
// No longer enabled, so stop running backups
if (DEBUG) Slog.i(TAG, "Opting out of backup");
mAlarmManager.cancel(mRunBackupIntent);
// This also constitutes an opt-out, so we wipe any data for
// this device from the backend. We start that process with
// an alarm in order to guarantee wakelock states.
if (wasEnabled && mProvisioned) {
// NOTE: we currently flush every registered transport, not just
// the currently-active one.
HashSet<String> allTransports;
synchronized (mTransports) {
allTransports = new HashSet<String>(mTransports.keySet());
}
// build the set of transports for which we are posting an init
for (String transport : allTransports) {
recordInitPendingLocked(true, transport);
}
mAlarmManager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(),
mRunInitIntent);
}
}
}
}
// Enable/disable automatic restore of app data at install time
public void setAutoRestore(boolean doAutoRestore) {
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.BACKUP,
"setBackupEnabled");
Slog.i(TAG, "Auto restore => " + doAutoRestore);
synchronized (this) {
Settings.Secure.putInt(mContext.getContentResolver(),
Settings.Secure.BACKUP_AUTO_RESTORE, doAutoRestore ? 1 : 0);
mAutoRestore = doAutoRestore;
}
}
// Mark the backup service as having been provisioned
public void setBackupProvisioned(boolean available) {
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.BACKUP,
"setBackupProvisioned");
boolean wasProvisioned = mProvisioned;
synchronized (this) {
Settings.Secure.putInt(mContext.getContentResolver(),
Settings.Secure.BACKUP_PROVISIONED, available ? 1 : 0);
mProvisioned = available;
}
synchronized (mQueueLock) {
if (available && !wasProvisioned && mEnabled) {
// we're now good to go, so start the backup alarms
startBackupAlarmsLocked(FIRST_BACKUP_INTERVAL);
} else if (!available) {
// No longer enabled, so stop running backups
Slog.w(TAG, "Backup service no longer provisioned");
mAlarmManager.cancel(mRunBackupIntent);
}
}
}
private void startBackupAlarmsLocked(long delayBeforeFirstBackup) {
// We used to use setInexactRepeating(), but that may be linked to
// backups running at :00 more often than not, creating load spikes.
// Schedule at an exact time for now, and also add a bit of "fuzz".
Random random = new Random();
long when = System.currentTimeMillis() + delayBeforeFirstBackup +
random.nextInt(FUZZ_MILLIS);
mAlarmManager.setRepeating(AlarmManager.RTC_WAKEUP, when,
BACKUP_INTERVAL + random.nextInt(FUZZ_MILLIS), mRunBackupIntent);
mNextBackupPass = when;
}
// Report whether the backup mechanism is currently enabled
public boolean isBackupEnabled() {
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.BACKUP, "isBackupEnabled");
return mEnabled; // no need to synchronize just to read it
}
// Report the name of the currently active transport
public String getCurrentTransport() {
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.BACKUP,
"getCurrentTransport");
if (DEBUG) Slog.v(TAG, "... getCurrentTransport() returning " + mCurrentTransport);
return mCurrentTransport;
}
// Report all known, available backup transports
public String[] listAllTransports() {
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.BACKUP, "listAllTransports");
String[] list = null;
ArrayList<String> known = new ArrayList<String>();
for (Map.Entry<String, IBackupTransport> entry : mTransports.entrySet()) {
if (entry.getValue() != null) {
known.add(entry.getKey());
}
}
if (known.size() > 0) {
list = new String[known.size()];
known.toArray(list);
}
return list;
}
// Select which transport to use for the next backup operation. If the given
// name is not one of the available transports, no action is taken and the method
// returns null.
public String selectBackupTransport(String transport) {
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.BACKUP, "selectBackupTransport");
synchronized (mTransports) {
String prevTransport = null;
if (mTransports.get(transport) != null) {
prevTransport = mCurrentTransport;
mCurrentTransport = transport;
Settings.Secure.putString(mContext.getContentResolver(),
Settings.Secure.BACKUP_TRANSPORT, transport);
Slog.v(TAG, "selectBackupTransport() set " + mCurrentTransport
+ " returning " + prevTransport);
} else {
Slog.w(TAG, "Attempt to select unavailable transport " + transport);
}
return prevTransport;
}
}
// Callback: a requested backup agent has been instantiated. This should only
// be called from the Activity Manager.
public void agentConnected(String packageName, IBinder agentBinder) {
synchronized(mAgentConnectLock) {
if (Binder.getCallingUid() == Process.SYSTEM_UID) {
Slog.d(TAG, "agentConnected pkg=" + packageName + " agent=" + agentBinder);
IBackupAgent agent = IBackupAgent.Stub.asInterface(agentBinder);
mConnectedAgent = agent;
mConnecting = false;
} else {
Slog.w(TAG, "Non-system process uid=" + Binder.getCallingUid()
+ " claiming agent connected");
}
mAgentConnectLock.notifyAll();
}
}
// Callback: a backup agent has failed to come up, or has unexpectedly quit.
// If the agent failed to come up in the first place, the agentBinder argument
// will be null. This should only be called from the Activity Manager.
public void agentDisconnected(String packageName) {
// TODO: handle backup being interrupted
synchronized(mAgentConnectLock) {
if (Binder.getCallingUid() == Process.SYSTEM_UID) {
mConnectedAgent = null;
mConnecting = false;
} else {
Slog.w(TAG, "Non-system process uid=" + Binder.getCallingUid()
+ " claiming agent disconnected");
}
mAgentConnectLock.notifyAll();
}
}
// An application being installed will need a restore pass, then the Package Manager
// will need to be told when the restore is finished.
public void restoreAtInstall(String packageName, int token) {
if (Binder.getCallingUid() != Process.SYSTEM_UID) {
Slog.w(TAG, "Non-system process uid=" + Binder.getCallingUid()
+ " attemping install-time restore");
return;
}
long restoreSet = getAvailableRestoreToken(packageName);
if (DEBUG) Slog.v(TAG, "restoreAtInstall pkg=" + packageName
+ " token=" + Integer.toHexString(token));
if (mAutoRestore && mProvisioned && restoreSet != 0) {
// okay, we're going to attempt a restore of this package from this restore set.
// The eventual message back into the Package Manager to run the post-install
// steps for 'token' will be issued from the restore handling code.
// We can use a synthetic PackageInfo here because:
// 1. We know it's valid, since the Package Manager supplied the name
// 2. Only the packageName field will be used by the restore code
PackageInfo pkg = new PackageInfo();
pkg.packageName = packageName;
mWakelock.acquire();
Message msg = mBackupHandler.obtainMessage(MSG_RUN_RESTORE);
msg.obj = new RestoreParams(getTransport(mCurrentTransport), null,
restoreSet, pkg, token);
mBackupHandler.sendMessage(msg);
} else {
// Auto-restore disabled or no way to attempt a restore; just tell the Package
// Manager to proceed with the post-install handling for this package.
if (DEBUG) Slog.v(TAG, "No restore set -- skipping restore");
try {
mPackageManagerBinder.finishPackageInstall(token);
} catch (RemoteException e) { /* can't happen */ }
}
}
// Hand off a restore session
public IRestoreSession beginRestoreSession(String transport) {
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.BACKUP, "beginRestoreSession");
synchronized(this) {
if (mActiveRestoreSession != null) {
Slog.d(TAG, "Restore session requested but one already active");
return null;
}
mActiveRestoreSession = new ActiveRestoreSession(transport);
}
return mActiveRestoreSession;
}
// Note that a currently-active backup agent has notified us that it has
// completed the given outstanding asynchronous backup/restore operation.
public void opComplete(int token) {
synchronized (mCurrentOpLock) {
if (DEBUG) Slog.v(TAG, "opComplete: " + Integer.toHexString(token));
mCurrentOperations.put(token, OP_ACKNOWLEDGED);
mCurrentOpLock.notifyAll();
}
}
// ----- Restore session -----
class ActiveRestoreSession extends IRestoreSession.Stub {
private static final String TAG = "RestoreSession";
private IBackupTransport mRestoreTransport = null;
RestoreSet[] mRestoreSets = null;
ActiveRestoreSession(String transport) {
mRestoreTransport = getTransport(transport);
}
// --- Binder interface ---
public synchronized int getAvailableRestoreSets(IRestoreObserver observer) {
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.BACKUP,
"getAvailableRestoreSets");
if (observer == null) {
throw new IllegalArgumentException("Observer must not be null");
}
long oldId = Binder.clearCallingIdentity();
try {
if (mRestoreTransport == null) {
Slog.w(TAG, "Null transport getting restore sets");
return -1;
}
// spin off the transport request to our service thread
mWakelock.acquire();
Message msg = mBackupHandler.obtainMessage(MSG_RUN_GET_RESTORE_SETS,
new RestoreGetSetsParams(mRestoreTransport, this, observer));
mBackupHandler.sendMessage(msg);
return 0;
} catch (Exception e) {
Slog.e(TAG, "Error in getAvailableRestoreSets", e);
return -1;
} finally {
Binder.restoreCallingIdentity(oldId);
}
}
public synchronized int restoreAll(long token, IRestoreObserver observer) {
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.BACKUP,
"performRestore");
if (DEBUG) Slog.d(TAG, "performRestore token=" + Long.toHexString(token)
+ " observer=" + observer);
if (mRestoreTransport == null || mRestoreSets == null) {
Slog.e(TAG, "Ignoring performRestore() with no restore set");
return -1;
}
synchronized (mQueueLock) {
for (int i = 0; i < mRestoreSets.length; i++) {
if (token == mRestoreSets[i].token) {
long oldId = Binder.clearCallingIdentity();
mWakelock.acquire();
Message msg = mBackupHandler.obtainMessage(MSG_RUN_RESTORE);
msg.obj = new RestoreParams(mRestoreTransport, observer, token);
mBackupHandler.sendMessage(msg);
Binder.restoreCallingIdentity(oldId);
return 0;
}
}
}
Slog.w(TAG, "Restore token " + Long.toHexString(token) + " not found");
return -1;
}
public synchronized int restorePackage(String packageName, IRestoreObserver observer) {
if (DEBUG) Slog.v(TAG, "restorePackage pkg=" + packageName + " obs=" + observer);
PackageInfo app = null;
try {
app = mPackageManager.getPackageInfo(packageName, 0);
} catch (NameNotFoundException nnf) {
Slog.w(TAG, "Asked to restore nonexistent pkg " + packageName);
return -1;
}
// If the caller is not privileged and is not coming from the target
// app's uid, throw a permission exception back to the caller.
int perm = mContext.checkPermission(android.Manifest.permission.BACKUP,
Binder.getCallingPid(), Binder.getCallingUid());
if ((perm == PackageManager.PERMISSION_DENIED) &&
(app.applicationInfo.uid != Binder.getCallingUid())) {
Slog.w(TAG, "restorePackage: bad packageName=" + packageName
+ " or calling uid=" + Binder.getCallingUid());
throw new SecurityException("No permission to restore other packages");
}
// If the package has no backup agent, we obviously cannot proceed
if (app.applicationInfo.backupAgentName == null) {
Slog.w(TAG, "Asked to restore package " + packageName + " with no agent");
return -1;
}
// So far so good; we're allowed to try to restore this package. Now
// check whether there is data for it in the current dataset, falling back
// to the ancestral dataset if not.
long token = getAvailableRestoreToken(packageName);
// If we didn't come up with a place to look -- no ancestral dataset and
// the app has never been backed up from this device -- there's nothing
// to do but return failure.
if (token == 0) {
return -1;
}
// Ready to go: enqueue the restore request and claim success
long oldId = Binder.clearCallingIdentity();
mWakelock.acquire();
Message msg = mBackupHandler.obtainMessage(MSG_RUN_RESTORE);
msg.obj = new RestoreParams(mRestoreTransport, observer, token, app, 0);
mBackupHandler.sendMessage(msg);
Binder.restoreCallingIdentity(oldId);
return 0;
}
public synchronized void endRestoreSession() {
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.BACKUP,
"endRestoreSession");
if (DEBUG) Slog.d(TAG, "endRestoreSession");
synchronized (this) {
long oldId = Binder.clearCallingIdentity();
try {
if (mRestoreTransport != null) mRestoreTransport.finishRestore();
} catch (Exception e) {
Slog.e(TAG, "Error in finishRestore", e);
} finally {
mRestoreTransport = null;
Binder.restoreCallingIdentity(oldId);
}
}
synchronized (BackupManagerService.this) {
if (BackupManagerService.this.mActiveRestoreSession == this) {
BackupManagerService.this.mActiveRestoreSession = null;
} else {
Slog.e(TAG, "ending non-current restore session");
}
}
}
}
@Override
public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
synchronized (mQueueLock) {
pw.println("Backup Manager is " + (mEnabled ? "enabled" : "disabled")
+ " / " + (!mProvisioned ? "not " : "") + "provisioned / "
+ (this.mPendingInits.size() == 0 ? "not " : "") + "pending init");
pw.println("Auto-restore is " + (mAutoRestore ? "enabled" : "disabled"));
pw.println("Last backup pass: " + mLastBackupPass
+ " (now = " + System.currentTimeMillis() + ')');
pw.println(" next scheduled: " + mNextBackupPass);
pw.println("Available transports:");
for (String t : listAllTransports()) {
pw.println((t.equals(mCurrentTransport) ? " * " : " ") + t);
try {
File dir = new File(mBaseStateDir, getTransport(t).transportDirName());
for (File f : dir.listFiles()) {
pw.println(" " + f.getName() + " - " + f.length() + " state bytes");
}
} catch (RemoteException e) {
Slog.e(TAG, "Error in transportDirName()", e);
pw.println(" Error: " + e);
}
}
pw.println("Pending init: " + mPendingInits.size());
for (String s : mPendingInits) {
pw.println(" " + s);
}
int N = mBackupParticipants.size();
pw.println("Participants:");
for (int i=0; i<N; i++) {
int uid = mBackupParticipants.keyAt(i);
pw.print(" uid: ");
pw.println(uid);
HashSet<ApplicationInfo> participants = mBackupParticipants.valueAt(i);
for (ApplicationInfo app: participants) {
pw.println(" " + app.packageName);
}
}
pw.println("Ancestral packages: "
+ (mAncestralPackages == null ? "none" : mAncestralPackages.size()));
if (mAncestralPackages != null) {
for (String pkg : mAncestralPackages) {
pw.println(" " + pkg);
}
}
pw.println("Ever backed up: " + mEverStoredApps.size());
for (String pkg : mEverStoredApps) {
pw.println(" " + pkg);
}
pw.println("Pending backup: " + mPendingBackups.size());
for (BackupRequest req : mPendingBackups.values()) {
pw.println(" " + req);
}
}
}
}