Fix race condition when setting default ringtones

If the device was powered off during first boot, after media scanner
inserted some entries but before the default ringtone settings were
set (or committed to disk), the default settings would not be set
on subsequent boots.

Bug: 18625739
Bug: 22349910
Change-Id: Iff07da59a9c6d53bf2950bd107ee74d02b7f48d6

1 files changed, 61 insertions, 28 deletions

diff --git a/media/java/android/media/MediaScanner.java b/media/java/android/media/MediaScanner.java
index 9ea6722..f36d640 100644
--- a/media/java/android/media/MediaScanner.java
+++ b/media/java/android/media/MediaScanner.java
@@ -20,6 +20,7 @@ import org.xml.sax.Attributes;
 import org.xml.sax.ContentHandler;
 import org.xml.sax.SAXException;
 
+import android.content.ContentResolver;
 import android.content.ContentUris;
 import android.content.ContentValues;
 import android.content.Context;
@@ -41,6 +42,7 @@ import android.provider.MediaStore.Files.FileColumns;
 import android.provider.MediaStore.Images;
 import android.provider.MediaStore.Video;
 import android.provider.Settings;
+import android.provider.Settings.SettingNotFoundException;
 import android.sax.Element;
 import android.sax.ElementListener;
 import android.sax.RootElement;
@@ -324,8 +326,6 @@ public class MediaScanner
     // used when scanning the image database so we know whether we have to prune
     // old thumbnail files
     private int mOriginalCount;
-    /** Whether the database had any entries in it before the scan started */
-    private boolean mWasEmptyPriorToScan = false;
     /** Whether the scanner has set a default sound for the ringer ringtone. */
     private boolean mDefaultRingtoneSet;
     /** Whether the scanner has set a default sound for the notification ringtone. */
@@ -535,6 +535,18 @@ public class MediaScanner
                 if (mMtpObjectHandle != 0) {
                     entry.mRowId = 0;
                 }
+
+                if ((!mDefaultNotificationSet &&
+                        doesPathHaveFilename(entry.mPath, mDefaultNotificationFilename))
+                        || (!mDefaultRingtoneSet &&
+                                doesPathHaveFilename(entry.mPath, mDefaultRingtoneFilename))
+                        || (!mDefaultAlarmSet &&
+                                doesPathHaveFilename(entry.mPath, mDefaultAlarmAlertFilename))) {
+                    Log.w(TAG, "forcing rescan of " + entry.mPath +
+                            "since ringtone setting didn't finish");
+                    scanAlways = true;
+                }
+
                 // rescan for metadata if file was modified since last scan
                 if (entry != null && (entry.mLastModifiedChanged || scanAlways)) {
                     if (noMedia) {
@@ -914,6 +926,26 @@ public class MediaScanner
             }
             Uri result = null;
             boolean needToSetSettings = false;
+            // Setting a flag in order not to use bulk insert for the file related with
+            // notifications, ringtones, and alarms, because the rowId of the inserted file is
+            // needed.
+            if (notifications && !mDefaultNotificationSet) {
+                if (TextUtils.isEmpty(mDefaultNotificationFilename) ||
+                        doesPathHaveFilename(entry.mPath, mDefaultNotificationFilename)) {
+                    needToSetSettings = true;
+                }
+            } else if (ringtones && !mDefaultRingtoneSet) {
+                if (TextUtils.isEmpty(mDefaultRingtoneFilename) ||
+                        doesPathHaveFilename(entry.mPath, mDefaultRingtoneFilename)) {
+                    needToSetSettings = true;
+                }
+            } else if (alarms && !mDefaultAlarmSet) {
+                if (TextUtils.isEmpty(mDefaultAlarmAlertFilename) ||
+                        doesPathHaveFilename(entry.mPath, mDefaultAlarmAlertFilename)) {
+                    needToSetSettings = true;
+                }
+            }
+
             if (rowId == 0) {
                 if (mMtpObjectHandle != 0) {
                     values.put(MediaStore.MediaColumns.MEDIA_SCANNER_NEW_OBJECT_ID, mMtpObjectHandle);
@@ -925,28 +957,6 @@ public class MediaScanner
                     }
                     values.put(Files.FileColumns.FORMAT, format);
                 }
-                // Setting a flag in order not to use bulk insert for the file related with
-                // notifications, ringtones, and alarms, because the rowId of the inserted file is
-                // needed.
-                if (mWasEmptyPriorToScan) {
-                    if (notifications && !mDefaultNotificationSet) {
-                        if (TextUtils.isEmpty(mDefaultNotificationFilename) ||
-                                doesPathHaveFilename(entry.mPath, mDefaultNotificationFilename)) {
-                            needToSetSettings = true;
-                        }
-                    } else if (ringtones && !mDefaultRingtoneSet) {
-                        if (TextUtils.isEmpty(mDefaultRingtoneFilename) ||
-                                doesPathHaveFilename(entry.mPath, mDefaultRingtoneFilename)) {
-                            needToSetSettings = true;
-                        }
-                    } else if (alarms && !mDefaultAlarmSet) {
-                        if (TextUtils.isEmpty(mDefaultAlarmAlertFilename) ||
-                                doesPathHaveFilename(entry.mPath, mDefaultAlarmAlertFilename)) {
-                            needToSetSettings = true;
-                        }
-                    }
-                }
-
                 // New file, insert it.
                 // Directories need to be inserted before the files they contain, so they
                 // get priority when bulk inserting.
@@ -1016,13 +1026,20 @@ public class MediaScanner
 
         private void setSettingIfNotSet(String settingName, Uri uri, long rowId) {
 
+            if(wasSettingAlreadySet(settingName)) {
+                return;
+            }
+
             String existingSettingValue = Settings.System.getString(mContext.getContentResolver(),
                     settingName);
 
             if (TextUtils.isEmpty(existingSettingValue)) {
                 // Set the setting to the given URI
-                Settings.System.putString(mContext.getContentResolver(), settingName,
+
+                ContentResolver cr = mContext.getContentResolver();
+                Settings.System.putString(cr, settingName,
                         ContentUris.withAppendedId(uri, rowId).toString());
+                Settings.System.putInt(cr, settingSetIndicatorName(settingName), 1);
             }
         }
 
@@ -1050,6 +1067,20 @@ public class MediaScanner
 
     }; // end of anonymous MediaScannerClient instance
 
+    private String settingSetIndicatorName(String base) {
+        return base + "_set";
+    }
+
+    private boolean wasSettingAlreadySet(String name) {
+        ContentResolver cr = mContext.getContentResolver();
+        String indicatorName = settingSetIndicatorName(name);
+        try {
+            return Settings.System.getInt(cr, indicatorName) != 0;
+        } catch (SettingNotFoundException e) {
+            return false;
+        }
+    }
+
     private void prescan(String filePath, boolean prescanFiles) throws RemoteException {
         Cursor c = null;
         String where = null;
@@ -1071,6 +1102,10 @@ public class MediaScanner
             selectionArgs = new String[] { "" };
         }
 
+        mDefaultRingtoneSet = wasSettingAlreadySet(Settings.System.RINGTONE);
+        mDefaultNotificationSet = wasSettingAlreadySet(Settings.System.NOTIFICATION_SOUND);
+        mDefaultAlarmSet = wasSettingAlreadySet(Settings.System.ALARM_ALERT);
+
         // Tell the provider to not delete the file.
         // If the file is truly gone the delete is unnecessary, and we want to avoid
         // accidentally deleting files that are really there (this may happen if the
@@ -1089,7 +1124,6 @@ public class MediaScanner
                 // with CursorWindow positioning.
                 long lastId = Long.MIN_VALUE;
                 Uri limitUri = mFilesUri.buildUpon().appendQueryParameter("limit", "1000").build();
-                mWasEmptyPriorToScan = true;
 
                 while (true) {
                     selectionArgs[0] = "" + lastId;
@@ -1108,7 +1142,6 @@ public class MediaScanner
                     if (num == 0) {
                         break;
                     }
-                    mWasEmptyPriorToScan = false;
                     while (c.moveToNext()) {
                         long rowId = c.getLong(FILES_PRESCAN_ID_COLUMN_INDEX);
                         String path = c.getString(FILES_PRESCAN_PATH_COLUMN_INDEX);
@@ -1260,7 +1293,7 @@ public class MediaScanner
         }
     }
 
-    private void postscan(String[] directories) throws RemoteException {
+    private void postscan(final String[] directories) throws RemoteException {
 
         // handle playlists last, after we know what media files are on the storage.
         if (mProcessPlaylists) {