am 094e3e0b: Merge change Icb89d482 into eclair

Merge commit '094e3e0bcc81a795f35ac2ea218d0fc0109100cf' into eclair-plus-aosp

* commit '094e3e0bcc81a795f35ac2ea218d0fc0109100cf':
  Check if rename of backed up file fails before persisting new changes.

core/java/android/app/ApplicationContext.java

@@ -2760,6 +2760,7 @@ class ApplicationContext extends Context {
             if (mFile.exists()) {
                 if (!mFile.renameTo(mBackupFile)) {
                     Log.e(TAG, "Couldn't rename file " + mFile + " to backup file " + mBackupFile);
+                    return false;
                 }
             }
             

core/java/com/android/internal/os/BatteryStatsImpl.java

@@ -2988,7 +2988,10 @@ public final class BatteryStatsImpl extends BatteryStats {
             if (mBackupFile.exists()) {
                 mBackupFile.delete();
             }
-            mFile.renameTo(mBackupFile);
+            if (!mFile.renameTo(mBackupFile)) {
+                Log.w("BatteryStats", "Failed to back up file before writing new stats");
+                return;
+            }
         }
 
         try {
@@ -3003,8 +3006,14 @@ public final class BatteryStatsImpl extends BatteryStats {
             mBackupFile.delete();
 
             mLastWriteTime = SystemClock.elapsedRealtime();
+            return;
         } catch (IOException e) {
-            Log.e("BatteryStats", "Error writing battery statistics", e);
+            Log.w("BatteryStats", "Error writing battery statistics", e);
+        }
+        if (mFile.exists()) {
+            if (!mFile.delete()) {
+                Log.w(TAG, "Failed to delete mangled file " + mFile);
+            }
         }
     }
 

services/java/com/android/server/AppWidgetService.java

@@ -816,7 +816,10 @@ class AppWidgetService extends IAppWidgetService.Stub
             temp.delete();
         }
 
-        writeStateToFileLocked(temp);
+        if (!writeStateToFileLocked(temp)) {
+            Log.w(TAG, "Failed to persist new settings");
+            return;
+        }
 
         //noinspection ResultOfMethodCallIgnored
         real.delete();
@@ -824,7 +827,7 @@ class AppWidgetService extends IAppWidgetService.Stub
         temp.renameTo(real);
     }
 
-    void writeStateToFileLocked(File file) {
+    boolean writeStateToFileLocked(File file) {
         FileOutputStream stream = null;
         int N;
 
@@ -877,6 +880,7 @@ class AppWidgetService extends IAppWidgetService.Stub
 
             out.endDocument();
             stream.close();
+            return true;
         } catch (IOException e) {
             try {
                 if (stream != null) {
@@ -889,6 +893,7 @@ class AppWidgetService extends IAppWidgetService.Stub
                 //noinspection ResultOfMethodCallIgnored
                 file.delete();
             }
+            return false;
         }
     }
 

services/java/com/android/server/PackageManagerService.java

@@ -2049,7 +2049,7 @@ class PackageManagerService extends IPackageManager.Stub {
             scanMode |= SCAN_FORWARD_LOCKED;
         }
         File resFile = destResourceFile;
-        if ((scanMode & SCAN_FORWARD_LOCKED) != 0) {
+        if (ps != null && ((scanMode & SCAN_FORWARD_LOCKED) != 0)) {
             resFile = getFwdLockedResource(ps.name);
         }
         // Note that we invoke the following method only if we are about to unpack an application
@@ -6529,15 +6529,19 @@ class PackageManagerService extends IPackageManager.Stub {
                         |FileUtils.S_IRGRP|FileUtils.S_IWGRP
                         |FileUtils.S_IROTH,
                         -1, -1);
+                return;
 
             } catch(XmlPullParserException e) {
                 Log.w(TAG, "Unable to write package manager settings, current changes will be lost at reboot", e);
-
             } catch(java.io.IOException e) {
                 Log.w(TAG, "Unable to write package manager settings, current changes will be lost at reboot", e);
-
             }
-
+            // Clean up partially written file
+            if (mSettingsFilename.exists()) {
+                if (!mSettingsFilename.delete()) {
+                    Log.i(TAG, "Failed to clean up mangled file: " + mSettingsFilename);
+                }
+            }
             //Debug.stopMethodTracing();
         }
        

services/java/com/android/server/am/UsageStatsService.java

@@ -381,7 +381,10 @@ public final class UsageStatsService extends IUsageStats.Stub {
             mFileLeaf = getCurrentDateStr(FILE_PREFIX);
             // Copy current file to back up
             File backupFile =  new File(mFile.getPath() + ".bak");
-            mFile.renameTo(backupFile);
+            if (!mFile.renameTo(backupFile)) {
+                Log.w(TAG, "Failed to persist new stats");
+                return;
+            }
             try {
                 // Write mStats to file
                 writeStatsFLOCK();