Fix deleteQuietly handling for symlinked directories

src/main/java/org/apache/commons/io/FileUtils.java

@@ -1302,7 +1302,7 @@ public static boolean deleteQuietly(final File file) {
             return false;
         }
         try {
-            if (file.isDirectory()) {
+            if (file.isDirectory() && !isSymlink(file)) {
                 cleanDirectory(file);
             }
         } catch (final Exception ignored) {

src/test/java/org/apache/commons/io/FileUtilsCleanSymlinksTest.java

@@ -21,6 +21,8 @@
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import java.io.File;
+import java.nio.file.Files;
+import java.nio.file.LinkOption;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -188,6 +190,30 @@ void testCorrectlyIdentifySymlinkWithParentSymLink() throws Exception {
         assertFalse(FileUtils.isSymlink(realChild));
     }
 
+    @Test
+    void testDeleteQuietlyWithASymlinkDirDeletesOnlyLink() throws Exception {
+        if (SystemProperties.getOsName().startsWith("Win")) {
+            // Can't use "ln" for symlinks on the command line in Windows.
+            return;
+        }
+
+        final File randomDirectory = new File(top, "randomDir");
+        assertTrue(randomDirectory.mkdirs());
+
+        final File randomFile = new File(randomDirectory, "randomfile");
+        FileUtils.touch(randomFile);
+        assertEquals(1, randomDirectory.list().length);
+
+        final File symlinkDirectory = new File(top, "fakeDir");
+        assertTrue(setupSymlink(randomDirectory, symlinkDirectory));
+
+        assertTrue(FileUtils.deleteQuietly(symlinkDirectory));
+        assertFalse(Files.exists(symlinkDirectory.toPath(), LinkOption.NOFOLLOW_LINKS));
+        assertTrue(randomDirectory.exists());
+        assertTrue(randomFile.exists());
+        assertEquals(1, randomDirectory.list().length, "Contents of symbolic link should not have been removed");
+    }
+
     @Test
     void testIdentifiesBrokenSymlinkFile() throws Exception {
         if (SystemProperties.getOsName().startsWith("Win")) {