| /* |
| * Copyright (C) 2017 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.utils; |
| |
| import static com.android.server.backup.BackupManagerService.BACKUP_MANIFEST_VERSION; |
| import static com.android.server.backup.BackupManagerService.TAG; |
| |
| import android.content.pm.PackageInfo; |
| import android.content.pm.PackageManager; |
| import android.content.pm.Signature; |
| import android.os.Build; |
| import android.os.ParcelFileDescriptor; |
| import android.util.Slog; |
| import android.util.StringBuilderPrinter; |
| |
| import java.io.DataInputStream; |
| import java.io.EOFException; |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| import java.io.OutputStream; |
| |
| /** |
| * Low-level utility methods for full backup. |
| */ |
| public class FullBackupUtils { |
| /** |
| * Reads data from pipe and writes it to the stream in chunks of up to 32KB. |
| * |
| * @param inPipe - pipe to read the data from. |
| * @param out - stream to write the data to. |
| * @throws IOException - in case of an error. |
| */ |
| public static void routeSocketDataToOutput(ParcelFileDescriptor inPipe, OutputStream out) |
| throws IOException { |
| // We do not take close() responsibility for the pipe FD |
| FileInputStream raw = new FileInputStream(inPipe.getFileDescriptor()); |
| DataInputStream in = new DataInputStream(raw); |
| |
| byte[] buffer = new byte[32 * 1024]; |
| int chunkTotal; |
| while ((chunkTotal = in.readInt()) > 0) { |
| while (chunkTotal > 0) { |
| int toRead = (chunkTotal > buffer.length) ? buffer.length : chunkTotal; |
| int nRead = in.read(buffer, 0, toRead); |
| if (nRead < 0) { |
| Slog.e(TAG, "Unexpectedly reached end of file while reading data"); |
| throw new EOFException(); |
| } |
| out.write(buffer, 0, nRead); |
| chunkTotal -= nRead; |
| } |
| } |
| } |
| |
| /** |
| * Writes app manifest to the given manifest file. |
| * |
| * @param pkg - app package, which manifest to write. |
| * @param packageManager - {@link PackageManager} instance. |
| * @param manifestFile - target manifest file. |
| * @param withApk - whether include apk or not. |
| * @param withWidgets - whether to write widgets data. |
| * @throws IOException - in case of an error. |
| */ |
| // TODO: withWidgets is not used, decide whether it is needed. |
| public static void writeAppManifest(PackageInfo pkg, PackageManager packageManager, |
| File manifestFile, boolean withApk, boolean withWidgets) throws IOException { |
| // Manifest format. All data are strings ending in LF: |
| // BACKUP_MANIFEST_VERSION, currently 1 |
| // |
| // Version 1: |
| // package name |
| // package's versionCode |
| // platform versionCode |
| // getInstallerPackageName() for this package (maybe empty) |
| // boolean: "1" if archive includes .apk; any other string means not |
| // number of signatures == N |
| // N*: signature byte array in ascii format per Signature.toCharsString() |
| StringBuilder builder = new StringBuilder(4096); |
| StringBuilderPrinter printer = new StringBuilderPrinter(builder); |
| |
| printer.println(Integer.toString(BACKUP_MANIFEST_VERSION)); |
| printer.println(pkg.packageName); |
| printer.println(Long.toString(pkg.getLongVersionCode())); |
| printer.println(Integer.toString(Build.VERSION.SDK_INT)); |
| |
| String installerName = packageManager.getInstallerPackageName(pkg.packageName); |
| printer.println((installerName != null) ? installerName : ""); |
| |
| printer.println(withApk ? "1" : "0"); |
| if (pkg.signatures == null) { |
| printer.println("0"); |
| } else { |
| printer.println(Integer.toString(pkg.signatures.length)); |
| for (Signature sig : pkg.signatures) { |
| printer.println(sig.toCharsString()); |
| } |
| } |
| |
| FileOutputStream outstream = new FileOutputStream(manifestFile); |
| outstream.write(builder.toString().getBytes()); |
| outstream.close(); |
| |
| // We want the manifest block in the archive stream to be idempotent: |
| // each time we generate a backup stream for the app, we want the manifest |
| // block to be identical. The underlying tar mechanism sees it as a file, |
| // though, and will propagate its mtime, causing the tar header to vary. |
| // Avoid this problem by pinning the mtime to zero. |
| manifestFile.setLastModified(0); |
| } |
| } |