SSH.java

/*
 * This file is part of Arduino.
 *
 * Arduino is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * As a special exception, you may use this file as part of a free software
 * library without restriction.  Specifically, if other files instantiate
 * templates or use macros or inline functions from this file, or you compile
 * this file and link it with other files to produce an executable, this
 * file does not by itself cause the resulting executable to be covered by
 * the GNU General Public License.  This exception does not however
 * invalidate any other reasons why the executable file might be covered by
 * the GNU General Public License.
 *
 * Copyright 2013 Arduino LLC (http://www.arduino.cc/)
 */

package cc.arduino.packages.ssh;

import java.io.IOException;
import java.io.InputStream;

import org.eclipse.ui.console.MessageConsoleStream;

import com.jcraft.jsch.Channel;
import com.jcraft.jsch.ChannelExec;
import com.jcraft.jsch.JSchException;
import com.jcraft.jsch.Session;

@SuppressWarnings({ "nls", "unqualified-field-access" })
public class SSH {

	final Session session;

	public SSH(Session session) {
		this.session = session;
	}

	public boolean execSyncCommand(String command) throws JSchException, IOException {
		return execSyncCommand(command, null, null);
	}

	@SuppressWarnings("resource")
	public boolean execSyncCommand(String command, MessageConsoleStream stdoutConsumer,
			MessageConsoleStream stderrConsumer) throws JSchException, IOException {
		InputStream stdout = null;
		InputStream stderr = null;
		Channel channel = null;
		try {
			channel = session.openChannel("exec");
			((ChannelExec) channel).setCommand(command);

			channel.setInputStream(null);

			stdout = channel.getInputStream();
			stderr = ((ChannelExec) channel).getErrStream();

			channel.connect();

			int exitCode = consumeOutputSyncAndReturnExitCode(channel);

			return exitCode == 0;

		} finally {
			try {
				if (stdout != null) {
					stdout.close();
				}
				if (stderr != null) {
					stderr.close();
				}
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			if (channel != null) {
				channel.disconnect();
			}
		}
	}

	private static int consumeOutputSyncAndReturnExitCode(Channel channel) {
		while (true) {

			if (channel.isClosed()) {
				return channel.getExitStatus();
			}
			try {
				Thread.sleep(100);
			} catch (Exception ee) {
				// noop
			}
		}
	}

	// @SuppressWarnings("static-method")
	// private void consumeStream(byte[] buffer, InputStream in, PrintStream
	// out) throws IOException {
	// while (in.available() > 0) {
	// int length = in.read(buffer, 0, buffer.length);
	// if (length < 0) {
	// break;
	// }
	// if (out != null) {
	// out.print(new String(buffer, 0, length));
	// }
	// }
	// }

}