Add system API for querying the available restore dataset for a package

Bug 20123585

Change-Id: Ife6e77a224b5d4175178aacdb7c285e9944b9eab

2 files changed, 10 insertions, 1 deletions

diff --git a/services/backup/java/com/android/server/backup/BackupManagerService.java b/services/backup/java/com/android/server/backup/BackupManagerService.java
index 96840a2..1bed4f3 100644
--- a/services/backup/java/com/android/server/backup/BackupManagerService.java
+++ b/services/backup/java/com/android/server/backup/BackupManagerService.java
@@ -2209,7 +2209,10 @@ public class BackupManagerService {
 
     // Get the restore-set token for the best-available restore set for this package:
     // the active set if possible, else the ancestral one.  Returns zero if none available.
-    long getAvailableRestoreToken(String packageName) {
+    public long getAvailableRestoreToken(String packageName) {
+        mContext.enforceCallingOrSelfPermission(android.Manifest.permission.BACKUP,
+                "getAvailableRestoreToken");
+
         long token = mAncestralToken;
         synchronized (mQueueLock) {
             if (mEverStoredApps.contains(packageName)) {
diff --git a/services/backup/java/com/android/server/backup/Trampoline.java b/services/backup/java/com/android/server/backup/Trampoline.java
index 99bbdae..5859c6a 100644
--- a/services/backup/java/com/android/server/backup/Trampoline.java
+++ b/services/backup/java/com/android/server/backup/Trampoline.java
@@ -317,6 +317,12 @@ public class Trampoline extends IBackupManager.Stub {
     }
 
     @Override
+    public long getAvailableRestoreToken(String packageName) {
+        BackupManagerService svc = mService;
+        return (svc != null) ? svc.getAvailableRestoreToken(packageName) : 0;
+    }
+
+    @Override
     public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
         mContext.enforceCallingOrSelfPermission(android.Manifest.permission.DUMP, TAG);