| /* |
| * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| import java.io.File; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| /** |
| * Utility class for finding the command on the current system |
| */ |
| public class UnixCommands { |
| |
| public static final boolean isUnix = ! System.getProperty("os.name").startsWith("Windows"); |
| public static final boolean isLinux = System.getProperty("os.name").startsWith("Linux"); |
| public static final boolean isSunOS = System.getProperty("os.name").equals("SunOS"); |
| |
| private static final String[] paths = {"/bin", "/usr/bin"}; |
| |
| private static Map<String,String> nameToCommand = new HashMap<>(16); |
| |
| /** |
| * Throws Error unless every listed command is available on the system |
| */ |
| public static void ensureCommandsAvailable(String... commands) { |
| for (String command : commands) { |
| if (findCommand(command) == null) { |
| throw new Error("Command '" + command + "' not found; bailing out"); |
| } |
| } |
| } |
| |
| /** |
| * If the path to the command could be found, returns the command with the full path. |
| * Otherwise, returns null. |
| */ |
| public static String cat() { return findCommand("cat"); } |
| public static String sh() { return findCommand("sh"); } |
| public static String kill() { return findCommand("kill"); } |
| public static String sleep() { return findCommand("sleep"); } |
| public static String tee() { return findCommand("tee"); } |
| public static String echo() { return findCommand("echo"); } |
| |
| public static String findCommand(String name) { |
| if (nameToCommand.containsKey(name)) { |
| return nameToCommand.get(name); |
| } |
| String command = findCommand0(name); |
| nameToCommand.put(name, command); |
| return command; |
| } |
| |
| private static String findCommand0(String name) { |
| for (String path : paths) { |
| File file = new File(path, name); |
| if (file.canExecute()) { |
| return file.getPath(); |
| } |
| } |
| return null; |
| } |
| } |