Added OM repair command

hadoop-ozone/tools/src/main/java/org/apache/hadoop/ozone/repair/om/FSORepairCLI.java

@@ -19,7 +19,6 @@
 package org.apache.hadoop.ozone.repair.om;
 
 import org.apache.hadoop.hdds.cli.SubcommandWithParent;
-import org.apache.hadoop.ozone.repair.OzoneRepair;
 import org.kohsuke.MetaInfServices;
 import picocli.CommandLine;
 
@@ -37,7 +36,7 @@
 public class FSORepairCLI implements Callable<Void>, SubcommandWithParent {
 
   @CommandLine.ParentCommand
-  private OzoneRepair parent;
+  private OMRepair parent;
 
   @CommandLine.Option(names = {"--db"},
       required = true,
@@ -85,6 +84,6 @@ public Void call() throws Exception {
 
   @Override
   public Class<?> getParentType() {
-    return OzoneRepair.class;
+    return OMRepair.class;
   }
 }

hadoop-ozone/tools/src/main/java/org/apache/hadoop/ozone/repair/om/OMRepair.java

@@ -0,0 +1,53 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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 org.apache.hadoop.ozone.repair.om;
+
+import org.apache.hadoop.hdds.cli.GenericCli;
+import org.apache.hadoop.hdds.cli.SubcommandWithParent;
+import org.apache.hadoop.ozone.repair.OzoneRepair;
+import org.kohsuke.MetaInfServices;
+import picocli.CommandLine;
+
+import java.util.concurrent.Callable;
+
+/**
+ * Ozone Repair CLI for OM.
+ */
+@CommandLine.Command(name = "om",
+        description = "Operational tool to repair OM.")
+@MetaInfServices(SubcommandWithParent.class)
+public class OMRepair implements Callable<Void>, SubcommandWithParent {
+
+  @CommandLine.Spec
+  private CommandLine.Model.CommandSpec spec;
+
+  @CommandLine.ParentCommand
+  private OzoneRepair parent;
+
+  @Override
+  public Void call() {
+    GenericCli.missingSubcommand(spec);
+    return null;
+  }
+
+  @Override
+  public Class<?> getParentType() {
+    return OzoneRepair.class;
+  }
+}