071bd521bc
Reviewed-by: alanb, bchristi, dcubed, dfuchs, eosterlund, erikj, glaubitz, ihse, iignatyev, jjiang, kbarrett, ksrini, kvn, naoto, prr, rriggs, serb, sspitsyn, stefank, tschatzl, valeriep, weijun, weijun
81 lines
2.9 KiB
Java
81 lines
2.9 KiB
Java
/*
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* Copyright (c) 2014, 2020, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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import java.io.File;
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import java.util.HashMap;
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import java.util.Map;
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/**
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* Utility class for finding the command on the current system
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*/
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public class UnixCommands {
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public static final boolean isUnix = ! System.getProperty("os.name").startsWith("Windows");
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public static final boolean isLinux = System.getProperty("os.name").startsWith("Linux");
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private static final String[] paths = {"/bin", "/usr/bin"};
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private static Map<String,String> nameToCommand = new HashMap<>(16);
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/**
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* Throws Error unless every listed command is available on the system
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*/
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public static void ensureCommandsAvailable(String... commands) {
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for (String command : commands) {
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if (findCommand(command) == null) {
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throw new Error("Command '" + command + "' not found; bailing out");
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}
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}
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}
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/**
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* If the path to the command could be found, returns the command with the full path.
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* Otherwise, returns null.
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*/
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public static String cat() { return findCommand("cat"); }
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public static String sh() { return findCommand("sh"); }
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public static String kill() { return findCommand("kill"); }
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public static String sleep() { return findCommand("sleep"); }
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public static String tee() { return findCommand("tee"); }
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public static String echo() { return findCommand("echo"); }
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public static String findCommand(String name) {
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if (nameToCommand.containsKey(name)) {
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return nameToCommand.get(name);
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}
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String command = findCommand0(name);
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nameToCommand.put(name, command);
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return command;
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}
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private static String findCommand0(String name) {
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for (String path : paths) {
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File file = new File(path, name);
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if (file.canExecute()) {
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return file.getPath();
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}
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}
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return null;
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}
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}
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