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Merge "Back up wallpapers via staged copies, not hard links" into nyc-mr1-dev

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This commit is contained in:
Chris Tate
2016-07-19 17:29:31 +00:00
committed by Android (Google) Code Review
parent 1dfbf794b5 ac482ebb00
commit 47f73c4733
1 changed files with 49 additions and 22 deletions
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71
packages/WallpaperBackup/src/com/android/wallpaperbackup/WallpaperBackupAgent.java
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@@ -16,17 +16,21 @@
package com.android.wallpaperbackup;
import static android.app.WallpaperManager.FLAG_LOCK;
import static android.app.WallpaperManager.FLAG_SYSTEM;
import android.app.WallpaperManager;
import android.app.backup.BackupAgent;
import android.app.backup.BackupDataInput;
import android.app.backup.BackupDataOutput;
import android.app.backup.FullBackupDataOutput;
import android.content.Context;
import android.content.SharedPreferences;
import android.graphics.Rect;
import android.os.Environment;
import android.os.FileUtils;
import android.os.ParcelFileDescriptor;
import android.os.UserHandle;
import android.system.Os;
import android.util.Slog;
import android.util.Xml;
@@ -40,7 +44,7 @@ import java.nio.charset.StandardCharsets;
public class WallpaperBackupAgent extends BackupAgent {
private static final String TAG = "WallpaperBackup";
private static final boolean DEBUG = true;
private static final boolean DEBUG = false;
// NB: must be kept in sync with WallpaperManagerService but has no
// compile-time visibility.
@@ -57,6 +61,11 @@ public class WallpaperBackupAgent extends BackupAgent {
static final String EMPTY_SENTINEL = "empty";
static final String QUOTA_SENTINEL = "quota";
// Not-for-backup bookkeeping
static final String PREFS_NAME = "wbprefs.xml";
static final String SYSTEM_GENERATION = "system_gen";
static final String LOCK_GENERATION = "lock_gen";
private File mWallpaperInfo; // wallpaper metadata file
private File mWallpaperFile; // primary wallpaper image file
private File mLockWallpaperFile; // lock wallpaper image file
@@ -106,27 +115,48 @@ public class WallpaperBackupAgent extends BackupAgent {
// only back up the wallpaper if we've been told it's allowed
if (mWm.isWallpaperBackupEligible()) {
if (DEBUG) {
Slog.v(TAG, "Wallpaper is backup-eligible; linking & writing");
Slog.v(TAG, "Wallpaper is backup-eligible");
}
// In case of prior muddled state
infoStage.delete();
imageStage.delete();
lockImageStage.delete();
SharedPreferences prefs = getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE);
final int lastSysGeneration = prefs.getInt(SYSTEM_GENERATION, -1);
final int lastLockGeneration = prefs.getInt(LOCK_GENERATION, -1);
final int sysGeneration =
mWm.getWallpaperIdForUser(FLAG_SYSTEM, UserHandle.USER_SYSTEM);
final int lockGeneration =
mWm.getWallpaperIdForUser(FLAG_LOCK, UserHandle.USER_SYSTEM);
final boolean sysChanged = (sysGeneration != lastSysGeneration);
final boolean lockChanged = (lockGeneration != lastLockGeneration);
if (DEBUG) {
Slog.v(TAG, "sysGen=" + sysGeneration + " : sysChanged=" + sysChanged);
Slog.v(TAG, "lockGen=" + lockGeneration + " : lockChanged=" + lockChanged);
}
if (mWallpaperInfo.exists()) {
Os.link(mWallpaperInfo.getCanonicalPath(), infoStage.getCanonicalPath());
if (sysChanged || lockChanged || !infoStage.exists()) {
if (DEBUG) Slog.v(TAG, "New wallpaper configuration; copying");
FileUtils.copyFileOrThrow(mWallpaperInfo, infoStage);
}
fullBackupFile(infoStage, data);
}
if (mWallpaperFile.exists()) {
Os.link(mWallpaperFile.getCanonicalPath(), imageStage.getCanonicalPath());
if (sysChanged || !imageStage.exists()) {
if (DEBUG) Slog.v(TAG, "New system wallpaper; copying");
FileUtils.copyFileOrThrow(mWallpaperFile, imageStage);
}
fullBackupFile(imageStage, data);
prefs.edit().putInt(SYSTEM_GENERATION, sysGeneration).apply();
}
// Don't try to store the lock image if we overran our quota last time
if (mLockWallpaperFile.exists() && !mQuotaExceeded) {
Os.link(mLockWallpaperFile.getCanonicalPath(), lockImageStage.getCanonicalPath());
if (lockChanged || !lockImageStage.exists()) {
if (DEBUG) Slog.v(TAG, "New lock wallpaper; copying");
FileUtils.copyFileOrThrow(mLockWallpaperFile, lockImageStage);
}
fullBackupFile(lockImageStage, data);
prefs.edit().putInt(LOCK_GENERATION, lockGeneration).apply();
}
} else {
if (DEBUG) {
@@ -136,13 +166,6 @@ public class WallpaperBackupAgent extends BackupAgent {
} catch (Exception e) {
Slog.e(TAG, "Unable to back up wallpaper", e);
} finally {
if (DEBUG) {
Slog.v(TAG, "Removing backup stage links");
}
infoStage.delete();
imageStage.delete();
lockImageStage.delete();
// Even if this time we had to back off on attempting to store the lock image
// due to exceeding the data quota, try again next time. This will alternate
// between "try both" and "only store the primary image" until either there
@@ -189,26 +212,30 @@ public class WallpaperBackupAgent extends BackupAgent {
Slog.e(TAG, "Unable to restore wallpaper: " + e.getMessage());
} finally {
if (DEBUG) {
Slog.v(TAG, "Removing restore stage files");
Slog.v(TAG, "Restore finished; clearing backup bookkeeping");
}
infoStage.delete();
imageStage.delete();
lockImageStage.delete();
SharedPreferences prefs = getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE);
prefs.edit()
.putInt(SYSTEM_GENERATION, -1)
.putInt(LOCK_GENERATION, -1)
.commit();
}
}
private void restoreFromStage(File stage, File info, String hintTag, int which)
throws IOException {
if (stage.exists()) {
if (DEBUG) {
Slog.v(TAG, "Got restored wallpaper; applying which=" + which);
}
// Parse the restored info file to find the crop hint. Note that this currently
// relies on a priori knowledge of the wallpaper info file schema.
Rect cropHint = parseCropHint(info, hintTag);
if (cropHint != null) {
Slog.i(TAG, "Got restored wallpaper; applying which=" + which);
if (DEBUG) {
Slog.v(TAG, "Restored crop hint " + cropHint + "; now writing data");
Slog.v(TAG, "Restored crop hint " + cropHint);
}
try (FileInputStream in = new FileInputStream(stage)) {
mWm.setStream(in, cropHint, true, which);