org.apache.tools.ant.taskdefs.launcher.VmsCommandLauncher Maven / Gradle / Ivy
/*
* 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.tools.ant.taskdefs.launcher;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.util.FileUtils;
/**
* A command launcher for VMS that writes the command to a temporary
* DCL script before launching commands. This is due to limitations of
* both the DCL interpreter and the Java VM implementation.
*/
public class VmsCommandLauncher extends Java13CommandLauncher {
/**
* Launches the given command in a new process.
*
* @param project
* the Ant project.
* @param cmd
* the command line to execute as an array of strings.
* @param env
* the environment to set as an array of strings.
* @return the created Process.
* @throws IOException
* forwarded from the exec method of the command launcher.
*/
@Override
public Process exec(Project project, String[] cmd, String[] env)
throws IOException {
File cmdFile = createCommandFile(cmd, env);
Process p =
super.exec(project, new String[] {cmdFile.getPath()}, env);
deleteAfter(cmdFile, p);
return p;
}
/**
* Launches the given command in a new process, in the given
* working directory. Note that under Java 1.4.0 and 1.4.1 on VMS
* this method only works if workingDir is null or
* the logical JAVA$FORK_SUPPORT_CHDIR needs to be set to TRUE.
*
* @param project
* the Ant project.
* @param cmd
* the command line to execute as an array of strings.
* @param env
* the environment to set as an array of strings.
* @param workingDir
* working directory where the command should run.
* @return the created Process.
* @throws IOException
* forwarded from the exec method of the command launcher.
*/
@Override
public Process exec(Project project, String[] cmd, String[] env,
File workingDir) throws IOException {
File cmdFile = createCommandFile(cmd, env);
Process p = super.exec(project, new String[] {cmdFile.getPath()}, env,
workingDir);
deleteAfter(cmdFile, p);
return p;
}
/*
* Writes the command into a temporary DCL script and returns the
* corresponding File object. The script will be deleted on exit.
* @param cmd the command line to execute as an array of strings.
* @param env the environment to set as an array of strings.
* @return the command File.
* @throws IOException if errors are encountered creating the file.
*/
private File createCommandFile(String[] cmd, String[] env)
throws IOException {
File script = FILE_UTILS.createTempFile("ANT", ".COM", null, true, true);
try (BufferedWriter out = new BufferedWriter(new FileWriter(script))) {
// add the environment as logicals to the DCL script
if (env != null) {
int eqIndex;
for (int i = 0; i < env.length; i++) {
eqIndex = env[i].indexOf('=');
if (eqIndex != -1) {
out.write("$ DEFINE/NOLOG ");
out.write(env[i].substring(0, eqIndex));
out.write(" \"");
out.write(env[i].substring(eqIndex + 1));
out.write('\"');
out.newLine();
}
}
}
out.write("$ " + cmd[0]);
for (int i = 1; i < cmd.length; i++) {
out.write(" -");
out.newLine();
out.write(cmd[i]);
}
}
return script;
}
private void deleteAfter(final File f, final Process p) {
new Thread() {
@Override
public void run() {
try {
p.waitFor();
} catch(InterruptedException e) {
// ignore
}
FileUtils.delete(f);
}
}.start();
}
}