LocalTransport.java revision 9310e4285b3fc951c3524d040726d1161015562c
1/* 2 * Copyright (C) 2009 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package com.android.internal.backup; 18 19import android.app.backup.BackupDataInput; 20import android.app.backup.BackupDataOutput; 21import android.app.backup.BackupTransport; 22import android.app.backup.RestoreDescription; 23import android.app.backup.RestoreSet; 24import android.content.ComponentName; 25import android.content.Context; 26import android.content.Intent; 27import android.content.pm.PackageInfo; 28import android.os.Environment; 29import android.os.ParcelFileDescriptor; 30import android.os.SELinux; 31import android.system.ErrnoException; 32import android.system.Os; 33import android.system.StructStat; 34import android.util.Log; 35 36import com.android.org.bouncycastle.util.encoders.Base64; 37 38import libcore.io.IoUtils; 39 40import java.io.BufferedOutputStream; 41import java.io.File; 42import java.io.FileInputStream; 43import java.io.FileNotFoundException; 44import java.io.FileOutputStream; 45import java.io.IOException; 46import java.util.ArrayList; 47import java.util.Collections; 48import static android.system.OsConstants.SEEK_CUR; 49 50/** 51 * Backup transport for stashing stuff into a known location on disk, and 52 * later restoring from there. For testing only. 53 */ 54 55public class LocalTransport extends BackupTransport { 56 private static final String TAG = "LocalTransport"; 57 private static final boolean DEBUG = false; 58 59 private static final String TRANSPORT_DIR_NAME 60 = "com.android.internal.backup.LocalTransport"; 61 62 private static final String TRANSPORT_DESTINATION_STRING 63 = "Backing up to debug-only private cache"; 64 65 private static final String TRANSPORT_DATA_MANAGEMENT_LABEL 66 = ""; 67 68 private static final String INCREMENTAL_DIR = "_delta"; 69 private static final String FULL_DATA_DIR = "_full"; 70 71 // The currently-active restore set always has the same (nonzero!) token 72 private static final long CURRENT_SET_TOKEN = 1; 73 74 private Context mContext; 75 private File mDataDir = new File(Environment.getDownloadCacheDirectory(), "backup"); 76 private File mCurrentSetDir = new File(mDataDir, Long.toString(CURRENT_SET_TOKEN)); 77 private File mCurrentSetIncrementalDir = new File(mCurrentSetDir, INCREMENTAL_DIR); 78 private File mCurrentSetFullDir = new File(mCurrentSetDir, FULL_DATA_DIR); 79 80 private PackageInfo[] mRestorePackages = null; 81 private int mRestorePackage = -1; // Index into mRestorePackages 82 private int mRestoreType; 83 private File mRestoreSetDir; 84 private File mRestoreSetIncrementalDir; 85 private File mRestoreSetFullDir; 86 87 // Additional bookkeeping for full backup 88 private String mFullTargetPackage; 89 private ParcelFileDescriptor mSocket; 90 private FileInputStream mSocketInputStream; 91 private BufferedOutputStream mFullBackupOutputStream; 92 private byte[] mFullBackupBuffer; 93 94 private FileInputStream mCurFullRestoreStream; 95 private FileOutputStream mFullRestoreSocketStream; 96 private byte[] mFullRestoreBuffer; 97 98 private void makeDataDirs() { 99 mCurrentSetDir.mkdirs(); 100 if (!SELinux.restorecon(mCurrentSetDir)) { 101 Log.e(TAG, "SELinux restorecon failed for " + mCurrentSetDir); 102 } 103 mCurrentSetFullDir.mkdir(); 104 mCurrentSetIncrementalDir.mkdir(); 105 } 106 107 public LocalTransport(Context context) { 108 mContext = context; 109 makeDataDirs(); 110 } 111 112 @Override 113 public String name() { 114 return new ComponentName(mContext, this.getClass()).flattenToShortString(); 115 } 116 117 @Override 118 public Intent configurationIntent() { 119 // The local transport is not user-configurable 120 return null; 121 } 122 123 @Override 124 public String currentDestinationString() { 125 return TRANSPORT_DESTINATION_STRING; 126 } 127 128 public Intent dataManagementIntent() { 129 // The local transport does not present a data-management UI 130 // TODO: consider adding simple UI to wipe the archives entirely, 131 // for cleaning up the cache partition. 132 return null; 133 } 134 135 public String dataManagementLabel() { 136 return TRANSPORT_DATA_MANAGEMENT_LABEL; 137 } 138 139 @Override 140 public String transportDirName() { 141 return TRANSPORT_DIR_NAME; 142 } 143 144 @Override 145 public long requestBackupTime() { 146 // any time is a good time for local backup 147 return 0; 148 } 149 150 @Override 151 public int initializeDevice() { 152 if (DEBUG) Log.v(TAG, "wiping all data"); 153 deleteContents(mCurrentSetDir); 154 makeDataDirs(); 155 return TRANSPORT_OK; 156 } 157 158 @Override 159 public int performBackup(PackageInfo packageInfo, ParcelFileDescriptor data) { 160 if (DEBUG) { 161 try { 162 StructStat ss = Os.fstat(data.getFileDescriptor()); 163 Log.v(TAG, "performBackup() pkg=" + packageInfo.packageName 164 + " size=" + ss.st_size); 165 } catch (ErrnoException e) { 166 Log.w(TAG, "Unable to stat input file in performBackup() on " 167 + packageInfo.packageName); 168 } 169 } 170 171 File packageDir = new File(mCurrentSetIncrementalDir, packageInfo.packageName); 172 packageDir.mkdirs(); 173 174 // Each 'record' in the restore set is kept in its own file, named by 175 // the record key. Wind through the data file, extracting individual 176 // record operations and building a set of all the updates to apply 177 // in this update. 178 BackupDataInput changeSet = new BackupDataInput(data.getFileDescriptor()); 179 try { 180 int bufSize = 512; 181 byte[] buf = new byte[bufSize]; 182 while (changeSet.readNextHeader()) { 183 String key = changeSet.getKey(); 184 String base64Key = new String(Base64.encode(key.getBytes())); 185 File entityFile = new File(packageDir, base64Key); 186 187 int dataSize = changeSet.getDataSize(); 188 189 if (DEBUG) Log.v(TAG, "Got change set key=" + key + " size=" + dataSize 190 + " key64=" + base64Key); 191 192 if (dataSize >= 0) { 193 if (entityFile.exists()) { 194 entityFile.delete(); 195 } 196 FileOutputStream entity = new FileOutputStream(entityFile); 197 198 if (dataSize > bufSize) { 199 bufSize = dataSize; 200 buf = new byte[bufSize]; 201 } 202 changeSet.readEntityData(buf, 0, dataSize); 203 if (DEBUG) { 204 try { 205 long cur = Os.lseek(data.getFileDescriptor(), 0, SEEK_CUR); 206 Log.v(TAG, " read entity data; new pos=" + cur); 207 } 208 catch (ErrnoException e) { 209 Log.w(TAG, "Unable to stat input file in performBackup() on " 210 + packageInfo.packageName); 211 } 212 } 213 214 try { 215 entity.write(buf, 0, dataSize); 216 } catch (IOException e) { 217 Log.e(TAG, "Unable to update key file " + entityFile.getAbsolutePath()); 218 return TRANSPORT_ERROR; 219 } finally { 220 entity.close(); 221 } 222 } else { 223 entityFile.delete(); 224 } 225 } 226 return TRANSPORT_OK; 227 } catch (IOException e) { 228 // oops, something went wrong. abort the operation and return error. 229 Log.v(TAG, "Exception reading backup input:", e); 230 return TRANSPORT_ERROR; 231 } 232 } 233 234 // Deletes the contents but not the given directory 235 private void deleteContents(File dirname) { 236 File[] contents = dirname.listFiles(); 237 if (contents != null) { 238 for (File f : contents) { 239 if (f.isDirectory()) { 240 // delete the directory's contents then fall through 241 // and delete the directory itself. 242 deleteContents(f); 243 } 244 f.delete(); 245 } 246 } 247 } 248 249 @Override 250 public int clearBackupData(PackageInfo packageInfo) { 251 if (DEBUG) Log.v(TAG, "clearBackupData() pkg=" + packageInfo.packageName); 252 253 File packageDir = new File(mCurrentSetIncrementalDir, packageInfo.packageName); 254 final File[] fileset = packageDir.listFiles(); 255 if (fileset != null) { 256 for (File f : fileset) { 257 f.delete(); 258 } 259 packageDir.delete(); 260 } 261 262 packageDir = new File(mCurrentSetFullDir, packageInfo.packageName); 263 final File[] tarballs = packageDir.listFiles(); 264 if (tarballs != null) { 265 for (File f : tarballs) { 266 f.delete(); 267 } 268 packageDir.delete(); 269 } 270 271 return TRANSPORT_OK; 272 } 273 274 @Override 275 public int finishBackup() { 276 if (DEBUG) Log.v(TAG, "finishBackup() of " + mFullTargetPackage); 277 return tearDownFullBackup(); 278 } 279 280 // ------------------------------------------------------------------------------------ 281 // Full backup handling 282 283 private int tearDownFullBackup() { 284 if (mSocket != null) { 285 try { 286 if (mFullBackupOutputStream != null) { 287 mFullBackupOutputStream.flush(); 288 mFullBackupOutputStream.close(); 289 } 290 mSocketInputStream = null; 291 mFullTargetPackage = null; 292 mSocket.close(); 293 } catch (IOException e) { 294 if (DEBUG) { 295 Log.w(TAG, "Exception caught in tearDownFullBackup()", e); 296 } 297 return TRANSPORT_ERROR; 298 } finally { 299 mSocket = null; 300 mFullBackupOutputStream = null; 301 } 302 } 303 return TRANSPORT_OK; 304 } 305 306 private File tarballFile(String pkgName) { 307 return new File(mCurrentSetFullDir, pkgName); 308 } 309 310 @Override 311 public long requestFullBackupTime() { 312 return 0; 313 } 314 315 @Override 316 public int checkFullBackupSize(long size) { 317 // Decline zero-size "backups" 318 final int result = (size > 0) ? TRANSPORT_OK : TRANSPORT_PACKAGE_REJECTED; 319 if (result != TRANSPORT_OK) { 320 if (DEBUG) { 321 Log.v(TAG, "Declining backup of size " + size); 322 } 323 } 324 return result; 325 } 326 327 @Override 328 public int performFullBackup(PackageInfo targetPackage, ParcelFileDescriptor socket) { 329 if (mSocket != null) { 330 Log.e(TAG, "Attempt to initiate full backup while one is in progress"); 331 return TRANSPORT_ERROR; 332 } 333 334 if (DEBUG) { 335 Log.i(TAG, "performFullBackup : " + targetPackage); 336 } 337 338 // We know a priori that we run in the system process, so we need to make 339 // sure to dup() our own copy of the socket fd. Transports which run in 340 // their own processes must not do this. 341 try { 342 mSocket = ParcelFileDescriptor.dup(socket.getFileDescriptor()); 343 mSocketInputStream = new FileInputStream(mSocket.getFileDescriptor()); 344 } catch (IOException e) { 345 Log.e(TAG, "Unable to process socket for full backup"); 346 return TRANSPORT_ERROR; 347 } 348 349 mFullTargetPackage = targetPackage.packageName; 350 mFullBackupBuffer = new byte[4096]; 351 352 return TRANSPORT_OK; 353 } 354 355 @Override 356 public int sendBackupData(final int numBytes) { 357 if (mSocket == null) { 358 Log.w(TAG, "Attempted sendBackupData before performFullBackup"); 359 return TRANSPORT_ERROR; 360 } 361 362 if (numBytes > mFullBackupBuffer.length) { 363 mFullBackupBuffer = new byte[numBytes]; 364 } 365 366 if (mFullBackupOutputStream == null) { 367 FileOutputStream tarstream; 368 try { 369 File tarball = tarballFile(mFullTargetPackage); 370 tarstream = new FileOutputStream(tarball); 371 } catch (FileNotFoundException e) { 372 return TRANSPORT_ERROR; 373 } 374 mFullBackupOutputStream = new BufferedOutputStream(tarstream); 375 } 376 377 int bytesLeft = numBytes; 378 while (bytesLeft > 0) { 379 try { 380 int nRead = mSocketInputStream.read(mFullBackupBuffer, 0, bytesLeft); 381 if (nRead < 0) { 382 // Something went wrong if we expect data but saw EOD 383 Log.w(TAG, "Unexpected EOD; failing backup"); 384 return TRANSPORT_ERROR; 385 } 386 mFullBackupOutputStream.write(mFullBackupBuffer, 0, nRead); 387 bytesLeft -= nRead; 388 } catch (IOException e) { 389 Log.e(TAG, "Error handling backup data for " + mFullTargetPackage); 390 return TRANSPORT_ERROR; 391 } 392 } 393 if (DEBUG) { 394 Log.v(TAG, " stored " + numBytes + " of data"); 395 } 396 return TRANSPORT_OK; 397 } 398 399 // For now we can't roll back, so just tear everything down. 400 @Override 401 public void cancelFullBackup() { 402 if (DEBUG) { 403 Log.i(TAG, "Canceling full backup of " + mFullTargetPackage); 404 } 405 File archive = tarballFile(mFullTargetPackage); 406 tearDownFullBackup(); 407 if (archive.exists()) { 408 archive.delete(); 409 } 410 } 411 412 // ------------------------------------------------------------------------------------ 413 // Restore handling 414 static final long[] POSSIBLE_SETS = { 2, 3, 4, 5, 6, 7, 8, 9 }; 415 416 @Override 417 public RestoreSet[] getAvailableRestoreSets() { 418 long[] existing = new long[POSSIBLE_SETS.length + 1]; 419 int num = 0; 420 421 // see which possible non-current sets exist... 422 for (long token : POSSIBLE_SETS) { 423 if ((new File(mDataDir, Long.toString(token))).exists()) { 424 existing[num++] = token; 425 } 426 } 427 // ...and always the currently-active set last 428 existing[num++] = CURRENT_SET_TOKEN; 429 430 RestoreSet[] available = new RestoreSet[num]; 431 for (int i = 0; i < available.length; i++) { 432 available[i] = new RestoreSet("Local disk image", "flash", existing[i]); 433 } 434 return available; 435 } 436 437 @Override 438 public long getCurrentRestoreSet() { 439 // The current restore set always has the same token 440 return CURRENT_SET_TOKEN; 441 } 442 443 @Override 444 public int startRestore(long token, PackageInfo[] packages) { 445 if (DEBUG) Log.v(TAG, "start restore " + token + " : " + packages.length 446 + " matching packages"); 447 mRestorePackages = packages; 448 mRestorePackage = -1; 449 mRestoreSetDir = new File(mDataDir, Long.toString(token)); 450 mRestoreSetIncrementalDir = new File(mRestoreSetDir, INCREMENTAL_DIR); 451 mRestoreSetFullDir = new File(mRestoreSetDir, FULL_DATA_DIR); 452 return TRANSPORT_OK; 453 } 454 455 @Override 456 public RestoreDescription nextRestorePackage() { 457 if (DEBUG) { 458 Log.v(TAG, "nextRestorePackage() : mRestorePackage=" + mRestorePackage 459 + " length=" + mRestorePackages.length); 460 } 461 if (mRestorePackages == null) throw new IllegalStateException("startRestore not called"); 462 463 boolean found = false; 464 while (++mRestorePackage < mRestorePackages.length) { 465 String name = mRestorePackages[mRestorePackage].packageName; 466 467 // If we have key/value data for this package, deliver that 468 // skip packages where we have a data dir but no actual contents 469 String[] contents = (new File(mRestoreSetIncrementalDir, name)).list(); 470 if (contents != null && contents.length > 0) { 471 if (DEBUG) { 472 Log.v(TAG, " nextRestorePackage(TYPE_KEY_VALUE) @ " 473 + mRestorePackage + " = " + name); 474 } 475 mRestoreType = RestoreDescription.TYPE_KEY_VALUE; 476 found = true; 477 } 478 479 if (!found) { 480 // No key/value data; check for [non-empty] full data 481 File maybeFullData = new File(mRestoreSetFullDir, name); 482 if (maybeFullData.length() > 0) { 483 if (DEBUG) { 484 Log.v(TAG, " nextRestorePackage(TYPE_FULL_STREAM) @ " 485 + mRestorePackage + " = " + name); 486 } 487 mRestoreType = RestoreDescription.TYPE_FULL_STREAM; 488 mCurFullRestoreStream = null; // ensure starting from the ground state 489 found = true; 490 } 491 } 492 493 if (found) { 494 return new RestoreDescription(name, mRestoreType); 495 } 496 497 if (DEBUG) { 498 Log.v(TAG, " ... package @ " + mRestorePackage + " = " + name 499 + " has no data; skipping"); 500 } 501 } 502 503 if (DEBUG) Log.v(TAG, " no more packages to restore"); 504 return RestoreDescription.NO_MORE_PACKAGES; 505 } 506 507 @Override 508 public int getRestoreData(ParcelFileDescriptor outFd) { 509 if (mRestorePackages == null) throw new IllegalStateException("startRestore not called"); 510 if (mRestorePackage < 0) throw new IllegalStateException("nextRestorePackage not called"); 511 if (mRestoreType != RestoreDescription.TYPE_KEY_VALUE) { 512 throw new IllegalStateException("getRestoreData(fd) for non-key/value dataset"); 513 } 514 File packageDir = new File(mRestoreSetIncrementalDir, 515 mRestorePackages[mRestorePackage].packageName); 516 517 // The restore set is the concatenation of the individual record blobs, 518 // each of which is a file in the package's directory. We return the 519 // data in lexical order sorted by key, so that apps which use synthetic 520 // keys like BLOB_1, BLOB_2, etc will see the date in the most obvious 521 // order. 522 ArrayList<DecodedFilename> blobs = contentsByKey(packageDir); 523 if (blobs == null) { // nextRestorePackage() ensures the dir exists, so this is an error 524 Log.e(TAG, "No keys for package: " + packageDir); 525 return TRANSPORT_ERROR; 526 } 527 528 // We expect at least some data if the directory exists in the first place 529 if (DEBUG) Log.v(TAG, " getRestoreData() found " + blobs.size() + " key files"); 530 BackupDataOutput out = new BackupDataOutput(outFd.getFileDescriptor()); 531 try { 532 for (DecodedFilename keyEntry : blobs) { 533 File f = keyEntry.file; 534 FileInputStream in = new FileInputStream(f); 535 try { 536 int size = (int) f.length(); 537 byte[] buf = new byte[size]; 538 in.read(buf); 539 if (DEBUG) Log.v(TAG, " ... key=" + keyEntry.key + " size=" + size); 540 out.writeEntityHeader(keyEntry.key, size); 541 out.writeEntityData(buf, size); 542 } finally { 543 in.close(); 544 } 545 } 546 return TRANSPORT_OK; 547 } catch (IOException e) { 548 Log.e(TAG, "Unable to read backup records", e); 549 return TRANSPORT_ERROR; 550 } 551 } 552 553 static class DecodedFilename implements Comparable<DecodedFilename> { 554 public File file; 555 public String key; 556 557 public DecodedFilename(File f) { 558 file = f; 559 key = new String(Base64.decode(f.getName())); 560 } 561 562 @Override 563 public int compareTo(DecodedFilename other) { 564 // sorts into ascending lexical order by decoded key 565 return key.compareTo(other.key); 566 } 567 } 568 569 // Return a list of the files in the given directory, sorted lexically by 570 // the Base64-decoded file name, not by the on-disk filename 571 private ArrayList<DecodedFilename> contentsByKey(File dir) { 572 File[] allFiles = dir.listFiles(); 573 if (allFiles == null || allFiles.length == 0) { 574 return null; 575 } 576 577 // Decode the filenames into keys then sort lexically by key 578 ArrayList<DecodedFilename> contents = new ArrayList<DecodedFilename>(); 579 for (File f : allFiles) { 580 contents.add(new DecodedFilename(f)); 581 } 582 Collections.sort(contents); 583 return contents; 584 } 585 586 @Override 587 public void finishRestore() { 588 if (DEBUG) Log.v(TAG, "finishRestore()"); 589 if (mRestoreType == RestoreDescription.TYPE_FULL_STREAM) { 590 resetFullRestoreState(); 591 } 592 mRestoreType = 0; 593 } 594 595 // ------------------------------------------------------------------------------------ 596 // Full restore handling 597 598 private void resetFullRestoreState() { 599 IoUtils.closeQuietly(mCurFullRestoreStream); 600 mCurFullRestoreStream = null; 601 mFullRestoreSocketStream = null; 602 mFullRestoreBuffer = null; 603 } 604 605 /** 606 * Ask the transport to provide data for the "current" package being restored. The 607 * transport then writes some data to the socket supplied to this call, and returns 608 * the number of bytes written. The system will then read that many bytes and 609 * stream them to the application's agent for restore, then will call this method again 610 * to receive the next chunk of the archive. This sequence will be repeated until the 611 * transport returns zero indicating that all of the package's data has been delivered 612 * (or returns a negative value indicating some sort of hard error condition at the 613 * transport level). 614 * 615 * <p>After this method returns zero, the system will then call 616 * {@link #getNextFullRestorePackage()} to begin the restore process for the next 617 * application, and the sequence begins again. 618 * 619 * @param socket The file descriptor that the transport will use for delivering the 620 * streamed archive. 621 * @return 0 when no more data for the current package is available. A positive value 622 * indicates the presence of that much data to be delivered to the app. A negative 623 * return value is treated as equivalent to {@link BackupTransport#TRANSPORT_ERROR}, 624 * indicating a fatal error condition that precludes further restore operations 625 * on the current dataset. 626 */ 627 @Override 628 public int getNextFullRestoreDataChunk(ParcelFileDescriptor socket) { 629 if (mRestoreType != RestoreDescription.TYPE_FULL_STREAM) { 630 throw new IllegalStateException("Asked for full restore data for non-stream package"); 631 } 632 633 // first chunk? 634 if (mCurFullRestoreStream == null) { 635 final String name = mRestorePackages[mRestorePackage].packageName; 636 if (DEBUG) Log.i(TAG, "Starting full restore of " + name); 637 File dataset = new File(mRestoreSetFullDir, name); 638 try { 639 mCurFullRestoreStream = new FileInputStream(dataset); 640 } catch (IOException e) { 641 // If we can't open the target package's tarball, we return the single-package 642 // error code and let the caller go on to the next package. 643 Log.e(TAG, "Unable to read archive for " + name); 644 return TRANSPORT_PACKAGE_REJECTED; 645 } 646 mFullRestoreSocketStream = new FileOutputStream(socket.getFileDescriptor()); 647 mFullRestoreBuffer = new byte[2*1024]; 648 } 649 650 int nRead; 651 try { 652 nRead = mCurFullRestoreStream.read(mFullRestoreBuffer); 653 if (nRead < 0) { 654 // EOF: tell the caller we're done 655 nRead = NO_MORE_DATA; 656 } else if (nRead == 0) { 657 // This shouldn't happen when reading a FileInputStream; we should always 658 // get either a positive nonzero byte count or -1. Log the situation and 659 // treat it as EOF. 660 Log.w(TAG, "read() of archive file returned 0; treating as EOF"); 661 nRead = NO_MORE_DATA; 662 } else { 663 if (DEBUG) { 664 Log.i(TAG, " delivering restore chunk: " + nRead); 665 } 666 mFullRestoreSocketStream.write(mFullRestoreBuffer, 0, nRead); 667 } 668 } catch (IOException e) { 669 return TRANSPORT_ERROR; // Hard error accessing the file; shouldn't happen 670 } finally { 671 // Most transports will need to explicitly close 'socket' here, but this transport 672 // is in the same process as the caller so it can leave it up to the backup manager 673 // to manage both socket fds. 674 } 675 676 return nRead; 677 } 678 679 /** 680 * If the OS encounters an error while processing {@link RestoreDescription#TYPE_FULL_STREAM} 681 * data for restore, it will invoke this method to tell the transport that it should 682 * abandon the data download for the current package. The OS will then either call 683 * {@link #nextRestorePackage()} again to move on to restoring the next package in the 684 * set being iterated over, or will call {@link #finishRestore()} to shut down the restore 685 * operation. 686 * 687 * @return {@link #TRANSPORT_OK} if the transport was successful in shutting down the 688 * current stream cleanly, or {@link #TRANSPORT_ERROR} to indicate a serious 689 * transport-level failure. If the transport reports an error here, the entire restore 690 * operation will immediately be finished with no further attempts to restore app data. 691 */ 692 @Override 693 public int abortFullRestore() { 694 if (mRestoreType != RestoreDescription.TYPE_FULL_STREAM) { 695 throw new IllegalStateException("abortFullRestore() but not currently restoring"); 696 } 697 resetFullRestoreState(); 698 mRestoreType = 0; 699 return TRANSPORT_OK; 700 } 701 702} 703