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/*****************************************************************************
* Copyright (c) 2009 Ken Gilmer
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Ken Gilmer - initial API and implementation
*******************************************************************************/
package org.openembedded.bc.bitbake;
import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.Writer;
/**
* A class for Linux shell sessions.
* @author kgilmer
*
*/
public class ShellSession {
/**
* Bash shell
*/
public static final int SHELL_TYPE_BASH = 1;
/**
* sh shell
*/
public static final int SHELL_TYPE_SH = 2;
private volatile boolean interrupt = false;
/**
* String used to isolate command execution
*/
public static final String TERMINATOR = "234o987dsfkcqiuwey18837032843259d";
public static final String LT = System.getProperty("line.separator");
public static String getFilePath(String file) throws IOException {
File f = new File(file);
if (!f.exists() || f.isDirectory()) {
throw new IOException("Path passed is not a file: " + file);
}
StringBuffer sb = new StringBuffer();
String elems[] = file.split(File.separator);
for (int i = 0; i < elems.length - 1; ++i) {
sb.append(elems[i]);
sb.append(File.separator);
}
return sb.toString();
}
private Process process;
private OutputStream pos = null;
//private File initFile = null;
private String shellPath = null;
private final String initCmd;
private final File root;
private final Writer out;
public ShellSession(int shellType, File root, String initCmd, Writer out) throws IOException {
this.root = root;
this.initCmd = initCmd;
if (out == null) {
this.out = new NullWriter();
} else {
this.out = out;
}
if (shellType == SHELL_TYPE_SH) {
shellPath = "/bin/sh";
}
shellPath = "/bin/bash";
initializeShell();
}
private void initializeShell() throws IOException {
process = Runtime.getRuntime().exec(shellPath);
pos = process.getOutputStream();
if (root != null) {
out.write(execute("cd " + root.getAbsolutePath()));
}
if (initCmd != null) {
out.write(execute("source " + initCmd));
}
}
synchronized public String execute(String command) throws IOException {
String errorMessage = null;
interrupt = false;
out.write(command);
out.write(LT);
sendToProcessAndTerminate(command);
if (process.getErrorStream().available() > 0) {
byte[] msg = new byte[process.getErrorStream().available()];
process.getErrorStream().read(msg, 0, msg.length);
out.write(new String(msg));
out.write(LT);
errorMessage = "Error while executing: " + command + LT + new String(msg);
}
BufferedReader br = new BufferedReader(new InputStreamReader(process
.getInputStream()));
StringBuffer sb = new StringBuffer();
String line = null;
while (((line = br.readLine()) != null) && !line.equals(TERMINATOR) && !interrupt) {
sb.append(line);
sb.append(LT);
out.write(line);
out.write(LT);
}
if (interrupt) {
process.destroy();
initializeShell();
interrupt = false;
}
if (errorMessage != null) {
throw new IOException(errorMessage);
}
return sb.toString();
}
synchronized public void execute(String command, ICommandResponseHandler handler) throws IOException {
execute(command, TERMINATOR, handler);
}
synchronized public void execute(String command, String terminator, ICommandResponseHandler handler) throws IOException {
interrupt = false;
InputStream errIs = process.getErrorStream();
if (errIs.available() > 0) {
clearErrorStream(errIs);
}
sendToProcessAndTerminate(command);
BufferedReader br = new BufferedReader(new InputStreamReader(process.getInputStream()));
String std = null;
do {
if (errIs.available() > 0) {
byte[] msg = new byte[errIs.available()];
errIs.read(msg, 0, msg.length);
out.write(new String(msg));
handler.response(new String(msg), true);
}
std = br.readLine();
if (std != null && !std.equals(terminator)) {
out.write(std);
handler.response(std, false);
}
} while (std != null && !std.equals(terminator) && !interrupt);
if (interrupt) {
process.destroy();
initializeShell();
interrupt = false;
}
}
private void clearErrorStream(InputStream is) {
try {
byte b[] = new byte[is.available()];
is.read(b);
//System.out.println("clearing: " + new String(b));
} catch (IOException e) {
e.printStackTrace();
//Ignore any error
}
}
/**
* Send command string to shell process and add special terminator string so
* reader knows when output is complete.
*
* @param command
* @throws IOException
*/
private void sendToProcessAndTerminate(String command) throws IOException {
pos.write(command.getBytes());
pos.write(LT.getBytes());
pos.flush();
pos.write("echo ".getBytes());
pos.write(TERMINATOR.getBytes());
pos.write(LT.getBytes());
pos.flush();
}
/**
* Interrupt any running processes.
*/
public void interrupt() {
interrupt = true;
}
private class NullWriter extends Writer {
@Override
public void close() throws IOException {
}
@Override
public void flush() throws IOException {
}
@Override
public void write(char[] cbuf, int off, int len) throws IOException {
}
}
}
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