Returns immediately if the bugreport file already exists

There's a case that BugreportProgressService is invoked twice quickly,
and both services create the same bugreport file name. The later one
may delete current running bugreport file in its clean function,
when it detects another bugreport is running.

Bug: 174314124
Test: atest BugreportReceiverTest
Change-Id: I5e1802c5912f4414f1ad3b8bdaf7c7420332b9d6

packages/Shell/src/com/android/shell/BugreportProgressService.java

@@ -618,12 +618,21 @@ public class BugreportProgressService extends Service {
 
         BugreportInfo info = new BugreportInfo(mContext, baseName, name,
                 shareTitle, shareDescription, bugreportType, mBugreportsDir);
+        synchronized (mLock) {
+            if (info.bugreportFile.exists()) {
+                Log.e(TAG, "Failed to start bugreport generation, the requested bugreport file "
+                        + info.bugreportFile + " already exists");
+                return;
+            }
+            info.createBugreportFile();
+        }
         ParcelFileDescriptor bugreportFd = info.getBugreportFd();
         if (bugreportFd == null) {
             Log.e(TAG, "Failed to start bugreport generation as "
                     + " bugreport parcel file descriptor is null.");
             return;
         }
+        info.createScreenshotFile(mBugreportsDir);
         ParcelFileDescriptor screenshotFd = null;
         if (isDefaultScreenshotRequired(bugreportType, /* hasScreenshotButton= */ !mIsTv)) {
             screenshotFd = info.getDefaultScreenshotFd();
@@ -1920,12 +1929,10 @@ public class BugreportProgressService extends Service {
             this.shareDescription = shareDescription == null ? "" : shareDescription;
             this.type = type;
             this.baseName = baseName;
-            createBugreportFile(bugreportsDir);
-            createScreenshotFile(bugreportsDir);
+            this.bugreportFile = new File(bugreportsDir, getFileName(this, ".zip"));
         }
 
-        void createBugreportFile(File bugreportsDir) {
-            bugreportFile = new File(bugreportsDir, getFileName(this, ".zip"));
+        void createBugreportFile() {
             createReadWriteFile(bugreportFile);
         }
 

packages/Shell/tests/src/com/android/shell/BugreportReceiverTest.java

@@ -40,6 +40,7 @@ import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.ArgumentMatchers.anyBoolean;
 import static org.mockito.ArgumentMatchers.anyInt;
 import static org.mockito.Mockito.timeout;
+import static org.mockito.Mockito.times;
 import static org.mockito.Mockito.verify;
 
 import android.app.ActivityManager;
@@ -534,6 +535,18 @@ public class BugreportReceiverTest {
         assertActionSendMultiple(extras);
     }
 
+    @Test
+    public void testBugreportRequestTwice_oneStartBugreportInvoked() throws Exception {
+        sendBugreportStarted();
+        new BugreportRequestedReceiver().onReceive(mContext,
+                new Intent(INTENT_BUGREPORT_REQUESTED));
+        getInstrumentation().waitForIdleSync();
+
+        verify(mMockIDumpstate, times(1)).startBugreport(anyInt(), any(), any(), any(),
+                anyInt(), any(), anyBoolean());
+        sendBugreportFinished();
+    }
+
     private void cancelExistingNotifications() {
         // Must kill service first, because notifications from a foreground service cannot be
         // canceled.