Tweak restore API (6a49dd08) · Commits · e / os / android_frameworks_base

core/java/android/app/backup/BackupTransport.java

+62 −35

Original line number	Diff line number	Diff line
		@@ -228,19 +228,35 @@ public class BackupTransport {
		}

		/**
		* Get the package name of the next application with data in the backup store.
		* Get the package name of the next application with data in the backup store, plus
		* a description of the structure of the restored archive: either TYPE_KEY_VALUE for
		* an original-API key/value dataset, or TYPE_FULL_STREAM for a tarball-type archive stream.
		*
		* @return The name of one of the packages supplied to {@link #startRestore},
		* or "" (the empty string) if no more backup data is available,
		* or null if an error occurred (the restore should be aborted and rescheduled).
		* <p>If the package name in the returned RestoreDescription object is the singleton
		* {@link RestoreDescription#NO_MORE_PACKAGES}, it indicates that no further data is available
		* in the current restore session: all packages described in startRestore() have been
		* processed.
		*
		* <p>If this method returns {@code null}, it means that a transport-level error has
		* occurred and the entire restore operation should be abandoned.
		*
		* @return A RestoreDescription object containing the name of one of the packages
		* supplied to {@link #startRestore} plus an indicator of the data type of that
		* restore data; or {@link RestoreDescription#NO_MORE_PACKAGES} to indicate that
		* no more packages can be restored in this session; or {@code null} to indicate
		* a transport-level error.
		*/
		public String nextRestorePackage() {
		public RestoreDescription nextRestorePackage() {
		return null;
		}

		/**
		* Get the data for the application returned by {@link #nextRestorePackage}.
		* @param data An open, writable file into which the backup data should be stored.
		* Get the data for the application returned by {@link #nextRestorePackage}, if that
		* method reported {@link RestoreDescription#TYPE_KEY_VALUE} as its delivery type.
		* If the package has only TYPE_FULL_STREAM data, then this method will return an
		* error.
		*
		* @param data An open, writable file into which the key/value backup data should be stored.
		* @return the same error codes as {@link #startRestore}.
		*/
		public int getRestoreData(ParcelFileDescriptor outFd) {
		@@ -332,32 +348,11 @@ public class BackupTransport {
		// Full restore interfaces

		/**
		* Ask the transport to set up to perform a full data restore of the given packages.
		* Ask the transport to provide data for the "current" package being restored. This
		* is the package that was just reported by {@link #nextRestorePackage()} as having
		* {@link RestoreDescription#TYPE_FULL_STREAM} data.
		*
		* @param token A backup token as returned by {@link #getAvailableRestoreSets}
		* or {@link #getCurrentRestoreSet}.
		* @param targetPackage The names of the packages whose data is being requested.
		* @return TRANSPORT_OK to indicate that the OS may proceed with requesting
		* restore data; TRANSPORT_ERROR to indicate a fatal error condition that precludes
		* performing any restore at this time.
		*/
		public int prepareFullRestore(long token, String[] targetPackages) {
		return BackupTransport.TRANSPORT_OK;
		}

		/**
		* Ask the transport what package's full data will be restored next. When all apps'
		* data has been delivered, the transport should return {@code null} here.
		* @return The package name of the next application whose data will be restored, or
		* {@code null} if all available package has been delivered.
		*/
		public String getNextFullRestorePackage() {
		return null;
		}

		/**
		* Ask the transport to provide data for the "current" package being restored. The
		* transport then writes some data to the socket supplied to this call, and returns
		* The transport writes some data to the socket supplied to this call, and returns
		* the number of bytes written. The system will then read that many bytes and
		* stream them to the application's agent for restore, then will call this method again
		* to receive the next chunk of the archive. This sequence will be repeated until the
		@@ -369,10 +364,14 @@ public class BackupTransport {
		* {@link #getNextFullRestorePackage()} to begin the restore process for the next
		* application, and the sequence begins again.
		*
		* <p>The transport should always close this socket when returning from this method.
		* Do not cache this socket across multiple calls or you may leak file descriptors.
		*
		* @param socket The file descriptor that the transport will use for delivering the
		* streamed archive.
		* streamed archive. The transport must close this socket in all cases when returning
		* from this method.
		* @return 0 when no more data for the current package is available. A positive value
		* indicates the presence of that much data to be delivered to the app. A negative
		* indicates the presence of that many bytes to be delivered to the app. Any negative
		* return value is treated as equivalent to {@link BackupTransport#TRANSPORT_ERROR},
		* indicating a fatal error condition that precludes further restore operations
		* on the current dataset.
		@@ -380,6 +379,24 @@ public class BackupTransport {
		public int getNextFullRestoreDataChunk(ParcelFileDescriptor socket) {
		return 0;
		}

		/**
		* If the OS encounters an error while processing {@link RestoreDescription#TYPE_FULL_STREAM}
		* data for restore, it will invoke this method to tell the transport that it should
		* abandon the data download for the current package. The OS will then either call
		* {@link #nextRestorePackage()} again to move on to restoring the next package in the
		* set being iterated over, or will call {@link #finishRestore()} to shut down the restore
		* operation.
		*
		* @return {@link #TRANSPORT_OK} if the transport was successful in shutting down the
		* current stream cleanly, or {@link #TRANSPORT_ERROR} to indicate a serious
		* transport-level failure. If the transport reports an error here, the entire restore
		* operation will immediately be finished with no further attempts to restore app data.
		*/
		public int abortFullRestore() {
		return BackupTransport.TRANSPORT_OK;
		}

		/**
		* Bridge between the actual IBackupTransport implementation and the stable API. If the
		* binder interface needs to change, we use this layer to translate so that we can
		@@ -450,7 +467,7 @@ public class BackupTransport {
		}

		@Override
		public String nextRestorePackage() throws RemoteException {
		public RestoreDescription nextRestorePackage() throws RemoteException {
		return BackupTransport.this.nextRestorePackage();
		}

		@@ -478,5 +495,15 @@ public class BackupTransport {
		public int sendBackupData(int numBytes) throws RemoteException {
		return BackupTransport.this.sendBackupData(numBytes);
		}

		@Override
		public int getNextFullRestoreDataChunk(ParcelFileDescriptor socket) {
		return BackupTransport.this.getNextFullRestoreDataChunk(socket);
		}

		@Override
		public int abortFullRestore() {
		return BackupTransport.this.abortFullRestore();
		}
		}
		}

core/java/android/app/backup/RestoreDescription.aidl

0 → 100644

+19 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2014 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 android.app.backup;

		parcelable RestoreDescription;

core/java/android/app/backup/RestoreDescription.java

0 → 100644

+101 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2014 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 android.app.backup;

		import android.os.Parcel;
		import android.os.Parcelable;

		/**
		* Description of the available restore data for a given package. Returned by a
		* BackupTransport in response to a request about the next available restorable
		* package.
		*
		* @see BackupTransport#nextRestorePackage()
		*
		* @hide
		*/
		public class RestoreDescription implements Parcelable {
		private final String mPackageName;
		private final int mDataType;

		private static final String NO_MORE_PACKAGES_SENTINEL = "";

		/**
		* Return this constant RestoreDescription from BackupTransport.nextRestorePackage()
		* to indicate that no more package data is available in the current restore operation.
		*/
		public static final RestoreDescription NO_MORE_PACKAGES =
		new RestoreDescription(NO_MORE_PACKAGES_SENTINEL, 0);

		// ---------------------------------------
		// Data type identifiers

		/** This package's restore data is an original-style key/value dataset */
		public static final int TYPE_KEY_VALUE = 1;

		/** This package's restore data is a tarball-type full data stream */
		public static final int TYPE_FULL_STREAM = 2;

		// ---------------------------------------
		// API

		public RestoreDescription(String packageName, int dataType) {
		mPackageName = packageName;
		mDataType = dataType;
		}

		public String getPackageName() {
		return mPackageName;
		}

		public int getDataType() {
		return mDataType;
		}

		// ---------------------------------------
		// Parcelable implementation - not used by transport

		@Override
		public int describeContents() {
		return 0;
		}

		@Override
		public void writeToParcel(Parcel out, int flags) {
		out.writeString(mPackageName);
		out.writeInt(mDataType);
		}

		public static final Parcelable.Creator<RestoreDescription> CREATOR
		= new Parcelable.Creator<RestoreDescription>() {
		public RestoreDescription createFromParcel(Parcel in) {
		final RestoreDescription unparceled = new RestoreDescription(in);
		return (NO_MORE_PACKAGES_SENTINEL.equals(unparceled.mPackageName))
		? NO_MORE_PACKAGES
		: unparceled;
		}

		public RestoreDescription[] newArray(int size) {
		return new RestoreDescription[size];
		}
		};

		private RestoreDescription(Parcel in) {
		mPackageName = in.readString();
		mDataType = in.readInt();
		}
		}

core/java/com/android/internal/backup/IBackupTransport.aidl

+70 −5

Original line number	Diff line number	Diff line
		@@ -16,6 +16,7 @@

		package com.android.internal.backup;

		import android.app.backup.RestoreDescription;
		import android.app.backup.RestoreSet;
		import android.content.Intent;
		import android.content.pm.PackageInfo;
		@@ -168,12 +169,25 @@ interface IBackupTransport {
		int startRestore(long token, in PackageInfo[] packages);

		/**
		* Get the package name of the next application with data in the backup store.
		* @return The name of one of the packages supplied to {@link #startRestore},
		* or "" (the empty string) if no more backup data is available,
		* or null if an error occurred (the restore should be aborted and rescheduled).
		* Get the package name of the next application with data in the backup store, plus
		* a description of the structure of the restored archive: either TYPE_KEY_VALUE for
		* an original-API key/value dataset, or TYPE_FULL_STREAM for a tarball-type archive stream.
		*
		* <p>If the package name in the returned RestoreDescription object is the singleton
		* {@link RestoreDescription#NO_MORE_PACKAGES}, it indicates that no further data is available
		* in the current restore session: all packages described in startRestore() have been
		* processed.
		*
		* <p>If this method returns {@code null}, it means that a transport-level error has
		* occurred and the entire restore operation should be abandoned.
		*
		* @return A RestoreDescription object containing the name of one of the packages
		* supplied to {@link #startRestore} plus an indicator of the data type of that
		* restore data; or {@link RestoreDescription#NO_MORE_PACKAGES} to indicate that
		* no more packages can be restored in this session; or {@code null} to indicate
		* a transport-level error.
		*/
		String nextRestorePackage();
		RestoreDescription nextRestorePackage();

		/**
		* Get the data for the application returned by {@link #nextRestorePackage}.
		@@ -188,7 +202,58 @@ interface IBackupTransport {
		*/
		void finishRestore();

		// full backup stuff

		long requestFullBackupTime();
		int performFullBackup(in PackageInfo targetPackage, in ParcelFileDescriptor socket);
		int sendBackupData(int numBytes);

		// full restore stuff

		/**
		* Ask the transport to provide data for the "current" package being restored. This
		* is the package that was just reported by {@link #nextRestorePackage()} as having
		* {@link RestoreDescription#TYPE_FULL_STREAM} data.
		*
		* The transport writes some data to the socket supplied to this call, and returns
		* the number of bytes written. The system will then read that many bytes and
		* stream them to the application's agent for restore, then will call this method again
		* to receive the next chunk of the archive. This sequence will be repeated until the
		* transport returns zero indicating that all of the package's data has been delivered
		* (or returns a negative value indicating some sort of hard error condition at the
		* transport level).
		*
		* <p>After this method returns zero, the system will then call
		* {@link #getNextFullRestorePackage()} to begin the restore process for the next
		* application, and the sequence begins again.
		*
		* <p>The transport should always close this socket when returning from this method.
		* Do not cache this socket across multiple calls or you may leak file descriptors.
		*
		* @param socket The file descriptor that the transport will use for delivering the
		* streamed archive. The transport must close this socket in all cases when returning
		* from this method.
		* @return 0 when no more data for the current package is available. A positive value
		* indicates the presence of that many bytes to be delivered to the app. Any negative
		* return value is treated as equivalent to {@link BackupTransport#TRANSPORT_ERROR},
		* indicating a fatal error condition that precludes further restore operations
		* on the current dataset.
		*/
		int getNextFullRestoreDataChunk(in ParcelFileDescriptor socket);

		/**
		* If the OS encounters an error while processing {@link RestoreDescription#TYPE_FULL_STREAM}
		* data for restore, it will invoke this method to tell the transport that it should
		* abandon the data download for the current package. The OS will then either call
		* {@link #nextRestorePackage()} again to move on to restoring the next package in the
		* set being iterated over, or will call {@link #finishRestore()} to shut down the restore
		* operation.
		*
		* @return {@link #TRANSPORT_OK} if the transport was successful in shutting down the
		* current stream cleanly, or {@link #TRANSPORT_ERROR} to indicate a serious
		* transport-level failure. If the transport reports an error here, the entire restore
		* operation will immediately be finished with no further attempts to restore app data.
		*/
		int abortFullRestore();

		}

core/java/com/android/internal/backup/LocalTransport.java

+44 −12

Original line number	Diff line number	Diff line
		@@ -19,6 +19,7 @@ package com.android.internal.backup;
		import android.app.backup.BackupDataInput;
		import android.app.backup.BackupDataOutput;
		import android.app.backup.BackupTransport;
		import android.app.backup.RestoreDescription;
		import android.app.backup.RestoreSet;
		import android.content.ComponentName;
		import android.content.Context;
		@@ -63,18 +64,24 @@ public class LocalTransport extends BackupTransport {
		private static final String TRANSPORT_DESTINATION_STRING
		= "Backing up to debug-only private cache";

		private static final String INCREMENTAL_DIR = "_delta";
		private static final String FULL_DATA_DIR = "_full";

		// The currently-active restore set always has the same (nonzero!) token
		private static final long CURRENT_SET_TOKEN = 1;

		private Context mContext;
		private File mDataDir = new File(Environment.getDownloadCacheDirectory(), "backup");
		private File mCurrentSetDir = new File(mDataDir, Long.toString(CURRENT_SET_TOKEN));
		private File mCurrentSetIncrementalDir = new File(mCurrentSetDir, "_delta");
		private File mCurrentSetFullDir = new File(mCurrentSetDir, "_full");
		private File mCurrentSetIncrementalDir = new File(mCurrentSetDir, INCREMENTAL_DIR);
		private File mCurrentSetFullDir = new File(mCurrentSetDir, FULL_DATA_DIR);

		private PackageInfo[] mRestorePackages = null;
		private int mRestorePackage = -1; // Index into mRestorePackages
		private File mRestoreDataDir;
		private int mRestoreType;
		private File mRestoreSetDir;
		private File mRestoreSetIncrementalDir;
		private File mRestoreSetFullDir;
		private long mRestoreToken;

		// Additional bookkeeping for full backup
		@@ -361,30 +368,55 @@ public class LocalTransport extends BackupTransport {
		mRestorePackages = packages;
		mRestorePackage = -1;
		mRestoreToken = token;
		mRestoreDataDir = new File(mDataDir, Long.toString(token));
		mRestoreSetDir = new File(mDataDir, Long.toString(token));
		mRestoreSetIncrementalDir = new File(mRestoreSetDir, INCREMENTAL_DIR);
		mRestoreSetFullDir = new File(mRestoreSetDir, FULL_DATA_DIR);
		return BackupTransport.TRANSPORT_OK;
		}

		public String nextRestorePackage() {
		@Override
		public RestoreDescription nextRestorePackage() {
		if (mRestorePackages == null) throw new IllegalStateException("startRestore not called");

		boolean found = false;
		while (++mRestorePackage < mRestorePackages.length) {
		String name = mRestorePackages[mRestorePackage].packageName;

		// If we have key/value data for this package, deliver that
		// skip packages where we have a data dir but no actual contents
		String[] contents = (new File(mRestoreDataDir, name)).list();
		String[] contents = (new File(mRestoreSetIncrementalDir, name)).list();
		if (contents != null && contents.length > 0) {
		if (DEBUG) Log.v(TAG, " nextRestorePackage() = " + name);
		return name;
		if (DEBUG) Log.v(TAG, " nextRestorePackage(TYPE_KEY_VALUE) = " + name);
		mRestoreType = RestoreDescription.TYPE_KEY_VALUE;
		found = true;
		}

		if (!found) {
		// No key/value data; check for [non-empty] full data
		File maybeFullData = new File(mRestoreSetFullDir, name);
		if (maybeFullData.length() > 0) {
		if (DEBUG) Log.v(TAG, " nextRestorePackage(TYPE_FULL_STREAM) = " + name);
		mRestoreType = RestoreDescription.TYPE_FULL_STREAM;
		found = true;
		}
		}

		if (found) {
		return new RestoreDescription(name, mRestoreType);
		}
		}

		if (DEBUG) Log.v(TAG, " no more packages to restore");
		return "";
		return RestoreDescription.NO_MORE_PACKAGES;
		}

		public int getRestoreData(ParcelFileDescriptor outFd) {
		if (mRestorePackages == null) throw new IllegalStateException("startRestore not called");
		if (mRestorePackage < 0) throw new IllegalStateException("nextRestorePackage not called");
		File packageDir = new File(mRestoreDataDir, mRestorePackages[mRestorePackage].packageName);
		if (mRestoreType != RestoreDescription.TYPE_KEY_VALUE) {
		throw new IllegalStateException("getRestoreData(fd) for non-key/value dataset");
		}
		File packageDir = new File(mRestoreSetDir, mRestorePackages[mRestorePackage].packageName);

		// The restore set is the concatenation of the individual record blobs,
		// each of which is a file in the package's directory. We return the
		@@ -463,8 +495,8 @@ public class LocalTransport extends BackupTransport {
		// Full restore handling

		public int prepareFullRestore(long token, String[] targetPackages) {
		mRestoreDataDir = new File(mDataDir, Long.toString(token));
		mFullRestoreSetDir = new File(mRestoreDataDir, "_full");
		mRestoreSetDir = new File(mDataDir, Long.toString(token));
		mFullRestoreSetDir = new File(mRestoreSetDir, FULL_DATA_DIR);
		mFullRestorePackages = new HashSet<String>();
		if (mFullRestoreSetDir.exists()) {
		List<String> pkgs = Arrays.asList(mFullRestoreSetDir.list());