LUCENE-5904: fix false fail

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1621429 13f79535-47bb-0310-9956-ffa450edef68

lucene/core/src/test/org/apache/lucene/index/TestIndexWriter.java

@@ -2504,7 +2504,10 @@ public class TestIndexWriter extends LuceneTestCase {
   public void testCorruptFirstCommit() throws Exception {
     for(int i=0;i<6;i++) {
       BaseDirectoryWrapper dir = newDirectory();
+
+      // Create a corrupt first commit:
       dir.createOutput("segments_0", IOContext.DEFAULT).close();
+
       IndexWriterConfig iwc = newIndexWriterConfig(new MockAnalyzer(random()));
       int mode = i/2;
       if (mode == 0) {
@@ -2544,6 +2547,16 @@ public class TestIndexWriter extends LuceneTestCase {
       if (mode != 0) {
         dir.setCheckIndexOnClose(false);
       }
+
+      if (dir instanceof MockDirectoryWrapper) {
+        MockDirectoryWrapper mdw = (MockDirectoryWrapper) dir;
+        if (Arrays.equals(new String[] {"segments_0"}, dir.listAll()) &&
+            mdw.didTryToDelete("segments_0")) {
+          // This means virus checker blocked IW deleting the corrupt first commit
+          dir.setCheckIndexOnClose(false);
+        }
+      }
+
       dir.close();
     }
   }

lucene/test-framework/src/java/org/apache/lucene/store/MockDirectoryWrapper.java

@@ -494,6 +494,12 @@ public class MockDirectoryWrapper extends BaseDirectoryWrapper {
     in.deleteFile(name);
   }
 
+  /** Returns true if {@link #deleteFile} was called with this
+   *  fileName, but the virus checker prevented the deletion. */
+  public boolean didTryToDelete(String fileName) {
+    return triedToDelete.contains(fileName);
+  }
+
   public synchronized Set<String> getOpenDeletedFiles() {
     return new HashSet<>(openFilesDeleted);
   }