content: /**
   * 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 com.alibaba.jstorm.utils;
  
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.List;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  public class SystemOperation {
  
      public static final Logger LOG = LoggerFactory.getLogger(SystemOperation.class);
  
      public static boolean isRoot() throws IOException {
          String result = SystemOperation.exec("echo $EUID").substring(0, 1);
          return Integer.valueOf(result.substring(0, result.length())) == 0;
      }
  
      public static void mount(String name, String target, String type, String data) throws IOException {
          StringBuilder sb = new StringBuilder();
          sb.append("mount -t ").append(type).append(" -o ").append(data).append(" ")
                  .append(name).append(" ").append(target);
          SystemOperation.exec(sb.toString());
      }
  
      public static void umount(String name) throws IOException {
          StringBuilder sb = new StringBuilder();
          sb.append("umount ").append(name);
          SystemOperation.exec(sb.toString());
      }
  
      public static String exec(String cmd) throws IOException {
          List<String> commands = new ArrayList<>();
          commands.add("/bin/bash");
          commands.add("-c");
          commands.add(cmd);
  
          return JStormUtils.launchProcess(cmd, commands, new HashMap<String, String>(), false);
      }
  
      public static void main(String[] args) throws IOException {
          SystemOperation.mount("test", "/cgroup/cpu", "cgroup", "cpu");
      }
  
  }
  