Avoid crash in system server when mounting container

A race condition when mounting a container in PackageHelper may cause
the system_server to crash (uncaught exception). Calling methods are
prepared to handle null, so return null instead.

Change-Id: I852ee21a2d847e37d81c1b900c27ddf94ef24fcb

1 files changed, 131 insertions, 0 deletions

diff --git a/core/tests/coretests/src/android/content/pm/PackageHelperTests.java b/core/tests/coretests/src/android/content/pm/PackageHelperTests.java
new file mode 100644
index 0000000..27112a6
--- /dev/null
+++ b/core/tests/coretests/src/android/content/pm/PackageHelperTests.java
@@ -0,0 +1,131 @@
+/*
+ * Copyright (C) 2011 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.content.pm;
+
+import com.android.internal.content.PackageHelper;
+
+import android.os.IBinder;
+import android.os.RemoteException;
+import android.os.ServiceManager;
+import android.os.storage.IMountService;
+import android.test.AndroidTestCase;
+import android.util.Log;
+
+public class PackageHelperTests extends AndroidTestCase {
+    private static final boolean localLOGV = true;
+    public static final String TAG = "PackageHelperTests";
+    protected final String PREFIX = "android.content.pm";
+    private IMountService mMs;
+    private String fullId;
+    private String fullId2;
+
+    private IMountService getMs() {
+        IBinder service = ServiceManager.getService("mount");
+        if (service != null) {
+            return IMountService.Stub.asInterface(service);
+        } else {
+            Log.e(TAG, "Can't get mount service");
+        }
+        return null;
+    }
+
+    private void cleanupContainers() throws RemoteException {
+        Log.d(TAG,"cleanUp");
+        IMountService ms = getMs();
+        String[] containers = ms.getSecureContainerList();
+        for (int i = 0; i < containers.length; i++) {
+            if (containers[i].startsWith(PREFIX)) {
+                Log.d(TAG,"cleaing up "+containers[i]);
+                ms.destroySecureContainer(containers[i], true);
+            }
+        }
+    }
+
+    void failStr(String errMsg) {
+        Log.w(TAG, "errMsg=" + errMsg);
+        fail(errMsg);
+    }
+
+    void failStr(Exception e) {
+        failStr(e.getMessage());
+    }
+
+    @Override
+    protected void setUp() throws Exception {
+        super.setUp();
+        if (localLOGV) Log.i(TAG, "Cleaning out old test containers");
+        cleanupContainers();
+    }
+
+    @Override
+    protected void tearDown() throws Exception {
+        super.tearDown();
+        if (localLOGV) Log.i(TAG, "Cleaning out old test containers");
+        cleanupContainers();
+    }
+
+    public void testMountAndPullSdCard() {
+        try {
+            fullId = PREFIX;
+            fullId2 = PackageHelper.createSdDir(1024, fullId, "none", android.os.Process.myUid());
+
+            Log.d(TAG,PackageHelper.getSdDir(fullId));
+            PackageHelper.unMountSdDir(fullId);
+
+            Runnable r1 = getMountRunnable();
+            Runnable r2 = getDestroyRunnable();
+            Thread thread = new Thread(r1);
+            Thread thread2 = new Thread(r2);
+            thread2.start();
+            thread.start();
+        } catch (Exception e) {
+            failStr(e);
+        }
+    }
+
+    public Runnable getMountRunnable() {
+        Runnable r = new Runnable () {
+            public void run () {
+                try {
+                    Thread.sleep(5);
+                    String path = PackageHelper.mountSdDir(fullId, "none",
+                            android.os.Process.myUid());
+                    Log.e(TAG, "mount done " + path);
+                } catch (IllegalArgumentException iae) {
+                    throw iae;
+                } catch (Throwable t) {
+                    Log.e(TAG, "mount failed", t);
+                }
+            }
+        };
+        return r;
+    }
+
+    public Runnable getDestroyRunnable() {
+        Runnable r = new Runnable () {
+            public void run () {
+                try {
+                    PackageHelper.destroySdDir(fullId);
+                    Log.e(TAG, "destroy done: " + fullId);
+                } catch (Throwable t) {
+                    Log.e(TAG, "destroy failed", t);
+                }
+            }
+        };
+        return r;
+    }
+}