/*
* 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.backup;
import android.app.ActivityManagerNative;
import android.app.IWallpaperManager;
import android.app.backup.BackupDataInput;
import android.app.backup.BackupDataOutput;
import android.app.backup.BackupAgentHelper;
import android.app.backup.FullBackup;
import android.app.backup.FullBackupDataOutput;
import android.app.backup.RecentsBackupHelper;
import android.app.backup.WallpaperBackupHelper;
import android.content.Context;
import android.os.Environment;
import android.os.ParcelFileDescriptor;
import android.os.RemoteException;
import android.os.ServiceManager;
import android.os.UserHandle;
import android.util.Slog;
import java.io.File;
import java.io.IOException;
/**
* Backup agent for various system-managed data, currently just the system wallpaper
*/
public class SystemBackupAgent extends BackupAgentHelper {
private static final String TAG = "SystemBackupAgent";
// These paths must match what the WallpaperManagerService uses. The leaf *_FILENAME
// are also used in the full-backup file format, so must not change unless steps are
// taken to support the legacy backed-up datasets.
private static final String WALLPAPER_IMAGE_FILENAME = "wallpaper";
private static final String WALLPAPER_INFO_FILENAME = "wallpaper_info.xml";
// TODO: Will need to change if backing up non-primary user's wallpaper
private static final String WALLPAPER_IMAGE_DIR =
Environment.getUserSystemDirectory(UserHandle.USER_OWNER).getAbsolutePath();
private static final String WALLPAPER_IMAGE = WallpaperBackupHelper.WALLPAPER_IMAGE;
// TODO: Will need to change if backing up non-primary user's wallpaper
private static final String WALLPAPER_INFO_DIR =
Environment.getUserSystemDirectory(UserHandle.USER_OWNER).getAbsolutePath();
private static final String WALLPAPER_INFO = WallpaperBackupHelper.WALLPAPER_INFO;
// Use old keys to keep legacy data compatibility and avoid writing two wallpapers
private static final String WALLPAPER_IMAGE_KEY = WallpaperBackupHelper.WALLPAPER_IMAGE_KEY;
private static final String WALLPAPER_INFO_KEY = WallpaperBackupHelper.WALLPAPER_INFO_KEY;
@Override
public void onBackup(ParcelFileDescriptor oldState, BackupDataOutput data,
ParcelFileDescriptor newState) throws IOException {
// We only back up the data under the current "wallpaper" schema with metadata
IWallpaperManager wallpaper = (IWallpaperManager)ServiceManager.getService(
Context.WALLPAPER_SERVICE);
String[] files = new String[] { WALLPAPER_IMAGE, WALLPAPER_INFO };
String[] keys = new String[] { WALLPAPER_IMAGE_KEY, WALLPAPER_INFO_KEY };
if (wallpaper != null) {
try {
final String wallpaperName = wallpaper.getName();
if (wallpaperName != null && wallpaperName.length() > 0) {
// When the wallpaper has a name, back up the info by itself.
// TODO: Don't rely on the innards of the service object like this!
// TODO: Send a delete for any stored wallpaper image in this case?
files = new String[] { WALLPAPER_INFO };
keys = new String[] { WALLPAPER_INFO_KEY };
}
} catch (RemoteException re) {
Slog.e(TAG, "Couldn't get wallpaper name\n" + re);
}
}
addHelper("wallpaper", new WallpaperBackupHelper(SystemBackupAgent.this, files, keys));
addHelper("recents", new RecentsBackupHelper(SystemBackupAgent.this));
super.onBackup(oldState, data, newState);
}
@Override
public void onFullBackup(FullBackupDataOutput data) throws IOException {
// At present we back up only the wallpaper
fullWallpaperBackup(data);
}
private void fullWallpaperBackup(FullBackupDataOutput output) {
// Back up the data files directly. We do them in this specific order --
// info file followed by image -- because then we need take no special
// steps during restore; the restore will happen properly when the individual
// files are restored piecemeal.
FullBackup.backupToTar(getPackageName(), FullBackup.ROOT_TREE_TOKEN, null,
WALLPAPER_INFO_DIR, WALLPAPER_INFO, output.getData());
FullBackup.backupToTar(getPackageName(), FullBackup.ROOT_TREE_TOKEN, null,
WALLPAPER_IMAGE_DIR, WALLPAPER_IMAGE, output.getData());
}
@Override
public void onRestore(BackupDataInput data, int appVersionCode, ParcelFileDescriptor newState)
throws IOException {
// On restore, we also support a previous data schema "system_files"
addHelper("wallpaper", new WallpaperBackupHelper(SystemBackupAgent.this,
new String[] { WALLPAPER_IMAGE, WALLPAPER_INFO },
new String[] { WALLPAPER_IMAGE_KEY, WALLPAPER_INFO_KEY} ));
addHelper("system_files", new WallpaperBackupHelper(SystemBackupAgent.this,
new String[] { WALLPAPER_IMAGE },
new String[] { WALLPAPER_IMAGE_KEY} ));
addHelper("recents", new RecentsBackupHelper(SystemBackupAgent.this));
try {
super.onRestore(data, appVersionCode, newState);
IWallpaperManager wallpaper = (IWallpaperManager) ServiceManager.getService(
Context.WALLPAPER_SERVICE);
if (wallpaper != null) {
try {
wallpaper.settingsRestored();
} catch (RemoteException re) {
Slog.e(TAG, "Couldn't restore settings\n" + re);
}
}
} catch (IOException ex) {
// If there was a failure, delete everything for the wallpaper, this is too aggressive,
// but this is hopefully a rare failure.
Slog.d(TAG, "restore failed", ex);
(new File(WALLPAPER_IMAGE)).delete();
(new File(WALLPAPER_INFO)).delete();
}
}
@Override
public void onRestoreFile(ParcelFileDescriptor data, long size,
int type, String domain, String path, long mode, long mtime)
throws IOException {
Slog.i(TAG, "Restoring file domain=" + domain + " path=" + path);
// Bits to indicate postprocessing we may need to perform
boolean restoredWallpaper = false;
File outFile = null;
// Various domain+files we understand a priori
if (domain.equals(FullBackup.ROOT_TREE_TOKEN)) {
if (path.equals(WALLPAPER_INFO_FILENAME)) {
outFile = new File(WALLPAPER_INFO);
restoredWallpaper = true;
} else if (path.equals(WALLPAPER_IMAGE_FILENAME)) {
outFile = new File(WALLPAPER_IMAGE);
restoredWallpaper = true;
}
}
try {
if (outFile == null) {
Slog.w(TAG, "Skipping unrecognized system file: [ " + domain + " : " + path + " ]");
}
FullBackup.restoreFile(data, size, type, mode, mtime, outFile);
if (restoredWallpaper) {
IWallpaperManager wallpaper =
(IWallpaperManager)ServiceManager.getService(
Context.WALLPAPER_SERVICE);
if (wallpaper != null) {
try {
wallpaper.settingsRestored();
} catch (RemoteException re) {
Slog.e(TAG, "Couldn't restore settings\n" + re);
}
}
}
} catch (IOException e) {
if (restoredWallpaper) {
// Make sure we wind up in a good state
(new File(WALLPAPER_IMAGE)).delete();
(new File(WALLPAPER_INFO)).delete();
}
}
}
@Override
public void onRestoreFinished() {
try {
ActivityManagerNative.getDefault().systemBackupRestored();
} catch (RemoteException e) {
// Not possible since this code is running in the system process.
}
}
}
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