| /** |
| * 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.storm.container.cgroup; |
| |
| import java.io.IOException; |
| import java.nio.channels.ClosedByInterruptException; |
| import org.apache.storm.shade.org.apache.commons.io.IOUtils; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * A class that implements system operations for using cgroups. |
| */ |
| public class SystemOperation { |
| |
| private 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())).intValue() == 0 ? true : false; |
| } |
| |
| public static void mount(String name, String target, String type, String options) throws IOException { |
| StringBuilder sb = new StringBuilder(); |
| sb.append("mount -t ") |
| .append(type) |
| .append(" -o ") |
| .append(options) |
| .append(" ") |
| .append(name) |
| .append(" ") |
| .append(target); |
| SystemOperation.exec(sb.toString()); |
| } |
| |
| public static void umount(String pathToDir) throws IOException { |
| StringBuilder sb = new StringBuilder(); |
| sb.append("umount ").append(pathToDir); |
| SystemOperation.exec(sb.toString()); |
| } |
| |
| public static String exec(String cmd) throws IOException { |
| LOG.debug("Shell cmd: {}", cmd); |
| Process process = new ProcessBuilder(new String[]{ "/bin/bash", "-c", cmd }).start(); |
| try { |
| process.waitFor(); |
| String output = IOUtils.toString(process.getInputStream()); |
| String errorOutput = IOUtils.toString(process.getErrorStream()); |
| LOG.debug("Shell Output: {}", output); |
| if (errorOutput.length() != 0) { |
| LOG.error("Shell Error Output: {}", errorOutput); |
| throw new IOException(errorOutput); |
| } |
| return output; |
| } catch (InterruptedException | ClosedByInterruptException ie) { |
| throw new IOException(ie); |
| } |
| } |
| } |