org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/Main.java - jgit - Git at Google

 /*
  * Copyright (C) 2006, Robin Rosenberg <robin.rosenberg@dewire.com>
  * Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org>
  * and other copyright owners as documented in the project's IP log.
  *
  * This program and the accompanying materials are made available
  * under the terms of the Eclipse Distribution License v1.0 which
  * accompanies this distribution, is reproduced below, and is
  * available at http://www.eclipse.org/org/documents/edl-v10.php
  *
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or
  * without modification, are permitted provided that the following
  * conditions are met:
  *
  * - Redistributions of source code must retain the above copyright
  *   notice, this list of conditions and the following disclaimer.
  *
  * - Redistributions in binary form must reproduce the above
  *   copyright notice, this list of conditions and the following
  *   disclaimer in the documentation and/or other materials provided
  *   with the distribution.
  *
  * - Neither the name of the Eclipse Foundation, Inc. nor the
  *   names of its contributors may be used to endorse or promote
  *   products derived from this software without specific prior
  *   written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
  * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */

 package org.eclipse.jgit.pgm;

 import java.io.File;
 import java.io.PrintWriter;
 import java.lang.reflect.InvocationTargetException;
 import java.net.MalformedURLException;
 import java.net.URL;
 import java.text.MessageFormat;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Set;

 import org.eclipse.jgit.awtui.AwtAuthenticator;
 import org.eclipse.jgit.awtui.AwtSshSessionFactory;
 import org.eclipse.jgit.errors.TransportException;
 import org.eclipse.jgit.lib.Constants;
 import org.eclipse.jgit.lib.Repository;
 import org.eclipse.jgit.pgm.opt.CmdLineParser;
 import org.eclipse.jgit.pgm.opt.SubcommandHandler;
 import org.eclipse.jgit.util.CachedAuthenticator;
 import org.eclipse.jgit.util.SystemReader;
 import org.kohsuke.args4j.Argument;
 import org.kohsuke.args4j.CmdLineException;
 import org.kohsuke.args4j.ExampleMode;
 import org.kohsuke.args4j.Option;

 /** Command line entry point. */
 public class Main {
 	@Option(name = "--help", usage = "usage_displayThisHelpText", aliases = { "-h" })
 	private boolean help;

 	@Option(name = "--show-stack-trace", usage = "usage_displayThejavaStackTraceOnExceptions")
 	private boolean showStackTrace;

 	@Option(name = "--git-dir", metaVar = "metaVar_gitDir", usage = "usage_setTheGitRepositoryToOperateOn")
 	private File gitdir;

 	@Argument(index = 0, metaVar = "metaVar_command", required = true, handler = SubcommandHandler.class)
 	private TextBuiltin subcommand;

 	@Argument(index = 1, metaVar = "metaVar_arg")
 	private List<String> arguments = new ArrayList<String>();

 	/**
 	 * Execute the command line.
 	 *
 	 * @param argv
 	 *            arguments.
 	 */
 	public static void main(final String[] argv) {
 		final Main me = new Main();
 		try {
 			if (!installConsole()) {
 				AwtAuthenticator.install();
 				AwtSshSessionFactory.install();
 			}
 			configureHttpProxy();
 			me.execute(argv);
 		} catch (Die err) {
 			System.err.println(MessageFormat.format(CLIText.get().fatalError, err.getMessage()));
 			if (me.showStackTrace)
 				err.printStackTrace();
 			System.exit(128);
 		} catch (Exception err) {
 			if (!me.showStackTrace && err.getCause() != null
 					&& err instanceof TransportException)
 				System.err.println(MessageFormat.format(CLIText.get().fatalError, err.getCause().getMessage()));

 			if (err.getClass().getName().startsWith("org.eclipse.jgit.errors.")) {
 				System.err.println(MessageFormat.format(CLIText.get().fatalError, err.getMessage()));
 				if (me.showStackTrace)
 					err.printStackTrace();
 				System.exit(128);
 			}
 			err.printStackTrace();
 			System.exit(1);
 		}
 	}

 	private void execute(final String[] argv) throws Exception {
 		final CmdLineParser clp = new CmdLineParser(this);
 		PrintWriter writer = new PrintWriter(System.err);
 		try {
 			clp.parseArgument(argv);
 		} catch (CmdLineException err) {
 			if (argv.length > 0 && !help) {
 				writer.println(MessageFormat.format(CLIText.get().fatalError, err.getMessage()));
 				writer.flush();
 				System.exit(1);
 			}
 		}

 		if (argv.length == 0 || help) {
 			final String ex = clp.printExample(ExampleMode.ALL, CLIText.get().resourceBundle());
 			writer.println("jgit" + ex + " command [ARG ...]");
 			if (help) {
 				writer.println();
 				clp.printUsage(writer, CLIText.get().resourceBundle());
 				writer.println();
 			} else if (subcommand == null) {
 				writer.println();
 				writer.println(CLIText.get().mostCommonlyUsedCommandsAre);
 				final CommandRef[] common = CommandCatalog.common();
 				int width = 0;
 				for (final CommandRef c : common)
 					width = Math.max(width, c.getName().length());
 				width += 2;

 				for (final CommandRef c : common) {
 					writer.print(' ');
 					writer.print(c.getName());
 					for (int i = c.getName().length(); i < width; i++)
 						writer.print(' ');
 					writer.print(CLIText.get().resourceBundle().getString(c.getUsage()));
 					writer.println();
 				}
 				writer.println();
 			}
 			writer.flush();
 			System.exit(1);
 		}

 		final TextBuiltin cmd = subcommand;
 		if (cmd.requiresRepository()) {
 			if (gitdir == null) {
 				String gitDirEnv = SystemReader.getInstance().getenv(Constants.GIT_DIR_KEY);
 				if (gitDirEnv != null)
 					gitdir = new File(gitDirEnv);
 			}
 			if (gitdir == null)
 				gitdir = findGitDir();

 			File gitworktree;
 			String gitWorkTreeEnv = SystemReader.getInstance().getenv(Constants.GIT_WORK_TREE_KEY);
 			if (gitWorkTreeEnv != null)
 				gitworktree = new File(gitWorkTreeEnv);
 			else
 				gitworktree = null;

 			File indexfile;
 			String indexFileEnv = SystemReader.getInstance().getenv(Constants.GIT_INDEX_KEY);
 			if (indexFileEnv != null)
 				indexfile = new File(indexFileEnv);
 			else
 				indexfile = null;

 			File objectdir;
 			String objectDirEnv = SystemReader.getInstance().getenv(Constants.GIT_OBJECT_DIRECTORY_KEY);
 			if (objectDirEnv != null)
 				objectdir = new File(objectDirEnv);
 			else
 				objectdir = null;

 			File[] altobjectdirs;
 			String altObjectDirEnv = SystemReader.getInstance().getenv(Constants.GIT_ALTERNATE_OBJECT_DIRECTORIES_KEY);
 			if (altObjectDirEnv != null) {
 				String[] parserdAltObjectDirEnv = altObjectDirEnv.split(File.pathSeparator);
 				altobjectdirs = new File[parserdAltObjectDirEnv.length];
 				for (int i = 0; i < parserdAltObjectDirEnv.length; i++)
 					altobjectdirs[i] = new File(parserdAltObjectDirEnv[i]);
 			} else
 				altobjectdirs = null;

 			if (gitdir == null || !gitdir.isDirectory()) {
 				writer.println(CLIText.get().cantFindGitDirectory);
 				writer.flush();
 				System.exit(1);
 			}
 			cmd.init(new Repository(gitdir, gitworktree, objectdir, altobjectdirs, indexfile), gitdir);
 		} else {
 			cmd.init(null, gitdir);
 		}
 		try {
 			cmd.execute(arguments.toArray(new String[arguments.size()]));
 		} finally {
 			if (cmd.out != null)
 				cmd.out.flush();
 		}
 	}

 	private static File findGitDir() {
 		Set<String> ceilingDirectories = new HashSet<String>();
 		String ceilingDirectoriesVar = SystemReader.getInstance().getenv(
 				Constants.GIT_CEILING_DIRECTORIES_KEY);
 		if (ceilingDirectoriesVar != null) {
 			ceilingDirectories.addAll(Arrays.asList(ceilingDirectoriesVar
 					.split(File.pathSeparator)));
 		}
 		File current = new File("").getAbsoluteFile();
 		while (current != null) {
 			final File gitDir = new File(current, Constants.DOT_GIT);
 			if (gitDir.isDirectory())
 				return gitDir;
 			current = current.getParentFile();
 			if (current != null
 					&& ceilingDirectories.contains(current.getPath()))
 				break;
 		}
 		return null;
 	}

 	private static boolean installConsole() {
 		try {
 			install("org.eclipse.jgit.console.ConsoleAuthenticator");
 			install("org.eclipse.jgit.console.ConsoleSshSessionFactory");
 			return true;
 		} catch (ClassNotFoundException e) {
 			return false;
 		} catch (NoClassDefFoundError e) {
 			return false;
 		} catch (UnsupportedClassVersionError e) {
 			return false;

 		} catch (IllegalArgumentException e) {
 			throw new RuntimeException(CLIText.get().cannotSetupConsole, e);
 		} catch (SecurityException e) {
 			throw new RuntimeException(CLIText.get().cannotSetupConsole, e);
 		} catch (IllegalAccessException e) {
 			throw new RuntimeException(CLIText.get().cannotSetupConsole, e);
 		} catch (InvocationTargetException e) {
 			throw new RuntimeException(CLIText.get().cannotSetupConsole, e);
 		} catch (NoSuchMethodException e) {
 			throw new RuntimeException(CLIText.get().cannotSetupConsole, e);
 		}
 	}

 	private static void install(final String name)
 			throws IllegalAccessException, InvocationTargetException,
 			NoSuchMethodException, ClassNotFoundException {
 		try {
 		Class.forName(name).getMethod("install").invoke(null);
 		} catch (InvocationTargetException e) {
 			if (e.getCause() instanceof RuntimeException)
 				throw (RuntimeException) e.getCause();
 			if (e.getCause() instanceof Error)
 				throw (Error) e.getCause();
 			throw e;
 		}
 	}

 	/**
 	 * Configure the JRE's standard HTTP based on <code>http_proxy</code>.
 	 * <p>
 	 * The popular libcurl library honors the <code>http_proxy</code>
 	 * environment variable as a means of specifying an HTTP proxy for requests
 	 * made behind a firewall. This is not natively recognized by the JRE, so
 	 * this method can be used by command line utilities to configure the JRE
 	 * before the first request is sent.
 	 *
 	 * @throws MalformedURLException
 	 *             the value in <code>http_proxy</code> is unsupportable.
 	 */
 	private static void configureHttpProxy() throws MalformedURLException {
 		final String s = System.getenv("http_proxy");
 		if (s == null || s.equals(""))
 			return;

 		final URL u = new URL((s.indexOf("://") == -1) ? "http://" + s : s);
 		if (!"http".equals(u.getProtocol()))
 			throw new MalformedURLException(MessageFormat.format(CLIText.get().invalidHttpProxyOnlyHttpSupported, s));

 		final String proxyHost = u.getHost();
 		final int proxyPort = u.getPort();

 		System.setProperty("http.proxyHost", proxyHost);
 		if (proxyPort > 0)
 			System.setProperty("http.proxyPort", String.valueOf(proxyPort));

 		final String userpass = u.getUserInfo();
 		if (userpass != null && userpass.contains(":")) {
 			final int c = userpass.indexOf(':');
 			final String user = userpass.substring(0, c);
 			final String pass = userpass.substring(c + 1);
 			CachedAuthenticator
 					.add(new CachedAuthenticator.CachedAuthentication(
 							proxyHost, proxyPort, user, pass));
 		}
 	}
 }
	/*
	* Copyright (C) 2006, Robin Rosenberg <robin.rosenberg@dewire.com>
	* Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org>
	* and other copyright owners as documented in the project's IP log.
	*
	* This program and the accompanying materials are made available
	* under the terms of the Eclipse Distribution License v1.0 which
	* accompanies this distribution, is reproduced below, and is
	* available at http://www.eclipse.org/org/documents/edl-v10.php
	*
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or
	* without modification, are permitted provided that the following
	* conditions are met:
	*
	* - Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	*
	* - Redistributions in binary form must reproduce the above
	* copyright notice, this list of conditions and the following
	* disclaimer in the documentation and/or other materials provided
	* with the distribution.
	*
	* - Neither the name of the Eclipse Foundation, Inc. nor the
	* names of its contributors may be used to endorse or promote
	* products derived from this software without specific prior
	* written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
	* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
	* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
	* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
	* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
	* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
	* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
	* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/

	package org.eclipse.jgit.pgm;

	import java.io.File;
	import java.io.PrintWriter;
	import java.lang.reflect.InvocationTargetException;
	import java.net.MalformedURLException;
	import java.net.URL;
	import java.text.MessageFormat;
	import java.util.ArrayList;
	import java.util.Arrays;
	import java.util.HashSet;
	import java.util.List;
	import java.util.Set;

	import org.eclipse.jgit.awtui.AwtAuthenticator;
	import org.eclipse.jgit.awtui.AwtSshSessionFactory;
	import org.eclipse.jgit.errors.TransportException;
	import org.eclipse.jgit.lib.Constants;
	import org.eclipse.jgit.lib.Repository;
	import org.eclipse.jgit.pgm.opt.CmdLineParser;
	import org.eclipse.jgit.pgm.opt.SubcommandHandler;
	import org.eclipse.jgit.util.CachedAuthenticator;
	import org.eclipse.jgit.util.SystemReader;
	import org.kohsuke.args4j.Argument;
	import org.kohsuke.args4j.CmdLineException;
	import org.kohsuke.args4j.ExampleMode;
	import org.kohsuke.args4j.Option;

	/** Command line entry point. */
	public class Main {
	@Option(name = "--help", usage = "usage_displayThisHelpText", aliases = { "-h" })
	private boolean help;

	@Option(name = "--show-stack-trace", usage = "usage_displayThejavaStackTraceOnExceptions")
	private boolean showStackTrace;

	@Option(name = "--git-dir", metaVar = "metaVar_gitDir", usage = "usage_setTheGitRepositoryToOperateOn")
	private File gitdir;

	@Argument(index = 0, metaVar = "metaVar_command", required = true, handler = SubcommandHandler.class)
	private TextBuiltin subcommand;

	@Argument(index = 1, metaVar = "metaVar_arg")
	private List<String> arguments = new ArrayList<String>();

	/**
	* Execute the command line.
	*
	* @param argv
	* arguments.
	*/
	public static void main(final String[] argv) {
	final Main me = new Main();
	try {
	if (!installConsole()) {
	AwtAuthenticator.install();
	AwtSshSessionFactory.install();
	}
	configureHttpProxy();
	me.execute(argv);
	} catch (Die err) {
	System.err.println(MessageFormat.format(CLIText.get().fatalError, err.getMessage()));
	if (me.showStackTrace)
	err.printStackTrace();
	System.exit(128);
	} catch (Exception err) {
	if (!me.showStackTrace && err.getCause() != null
	&& err instanceof TransportException)
	System.err.println(MessageFormat.format(CLIText.get().fatalError, err.getCause().getMessage()));

	if (err.getClass().getName().startsWith("org.eclipse.jgit.errors.")) {
	System.err.println(MessageFormat.format(CLIText.get().fatalError, err.getMessage()));
	if (me.showStackTrace)
	err.printStackTrace();
	System.exit(128);
	}
	err.printStackTrace();
	System.exit(1);
	}
	}

	private void execute(final String[] argv) throws Exception {
	final CmdLineParser clp = new CmdLineParser(this);
	PrintWriter writer = new PrintWriter(System.err);
	try {
	clp.parseArgument(argv);
	} catch (CmdLineException err) {
	if (argv.length > 0 && !help) {
	writer.println(MessageFormat.format(CLIText.get().fatalError, err.getMessage()));
	writer.flush();
	System.exit(1);
	}
	}

	if (argv.length == 0 \|\| help) {
	final String ex = clp.printExample(ExampleMode.ALL, CLIText.get().resourceBundle());
	writer.println("jgit" + ex + " command [ARG ...]");
	if (help) {
	writer.println();
	clp.printUsage(writer, CLIText.get().resourceBundle());
	writer.println();
	} else if (subcommand == null) {
	writer.println();
	writer.println(CLIText.get().mostCommonlyUsedCommandsAre);
	final CommandRef[] common = CommandCatalog.common();
	int width = 0;
	for (final CommandRef c : common)
	width = Math.max(width, c.getName().length());
	width += 2;

	for (final CommandRef c : common) {
	writer.print(' ');
	writer.print(c.getName());
	for (int i = c.getName().length(); i < width; i++)
	writer.print(' ');
	writer.print(CLIText.get().resourceBundle().getString(c.getUsage()));
	writer.println();
	}
	writer.println();
	}
	writer.flush();
	System.exit(1);
	}

	final TextBuiltin cmd = subcommand;
	if (cmd.requiresRepository()) {
	if (gitdir == null) {
	String gitDirEnv = SystemReader.getInstance().getenv(Constants.GIT_DIR_KEY);
	if (gitDirEnv != null)
	gitdir = new File(gitDirEnv);
	}
	if (gitdir == null)
	gitdir = findGitDir();

	File gitworktree;
	String gitWorkTreeEnv = SystemReader.getInstance().getenv(Constants.GIT_WORK_TREE_KEY);
	if (gitWorkTreeEnv != null)
	gitworktree = new File(gitWorkTreeEnv);
	else
	gitworktree = null;

	File indexfile;
	String indexFileEnv = SystemReader.getInstance().getenv(Constants.GIT_INDEX_KEY);
	if (indexFileEnv != null)
	indexfile = new File(indexFileEnv);
	else
	indexfile = null;

	File objectdir;
	String objectDirEnv = SystemReader.getInstance().getenv(Constants.GIT_OBJECT_DIRECTORY_KEY);
	if (objectDirEnv != null)
	objectdir = new File(objectDirEnv);
	else
	objectdir = null;

	File[] altobjectdirs;
	String altObjectDirEnv = SystemReader.getInstance().getenv(Constants.GIT_ALTERNATE_OBJECT_DIRECTORIES_KEY);
	if (altObjectDirEnv != null) {
	String[] parserdAltObjectDirEnv = altObjectDirEnv.split(File.pathSeparator);
	altobjectdirs = new File[parserdAltObjectDirEnv.length];
	for (int i = 0; i < parserdAltObjectDirEnv.length; i++)
	altobjectdirs[i] = new File(parserdAltObjectDirEnv[i]);
	} else
	altobjectdirs = null;

	if (gitdir == null \|\| !gitdir.isDirectory()) {
	writer.println(CLIText.get().cantFindGitDirectory);
	writer.flush();
	System.exit(1);
	}
	cmd.init(new Repository(gitdir, gitworktree, objectdir, altobjectdirs, indexfile), gitdir);
	} else {
	cmd.init(null, gitdir);
	}
	try {
	cmd.execute(arguments.toArray(new String[arguments.size()]));
	} finally {
	if (cmd.out != null)
	cmd.out.flush();
	}
	}

	private static File findGitDir() {
	Set<String> ceilingDirectories = new HashSet<String>();
	String ceilingDirectoriesVar = SystemReader.getInstance().getenv(
	Constants.GIT_CEILING_DIRECTORIES_KEY);
	if (ceilingDirectoriesVar != null) {
	ceilingDirectories.addAll(Arrays.asList(ceilingDirectoriesVar
	.split(File.pathSeparator)));
	}
	File current = new File("").getAbsoluteFile();
	while (current != null) {
	final File gitDir = new File(current, Constants.DOT_GIT);
	if (gitDir.isDirectory())
	return gitDir;
	current = current.getParentFile();
	if (current != null
	&& ceilingDirectories.contains(current.getPath()))
	break;
	}
	return null;
	}

	private static boolean installConsole() {
	try {
	install("org.eclipse.jgit.console.ConsoleAuthenticator");
	install("org.eclipse.jgit.console.ConsoleSshSessionFactory");
	return true;
	} catch (ClassNotFoundException e) {
	return false;
	} catch (NoClassDefFoundError e) {
	return false;
	} catch (UnsupportedClassVersionError e) {
	return false;

	} catch (IllegalArgumentException e) {
	throw new RuntimeException(CLIText.get().cannotSetupConsole, e);
	} catch (SecurityException e) {
	throw new RuntimeException(CLIText.get().cannotSetupConsole, e);
	} catch (IllegalAccessException e) {
	throw new RuntimeException(CLIText.get().cannotSetupConsole, e);
	} catch (InvocationTargetException e) {
	throw new RuntimeException(CLIText.get().cannotSetupConsole, e);
	} catch (NoSuchMethodException e) {
	throw new RuntimeException(CLIText.get().cannotSetupConsole, e);
	}
	}

	private static void install(final String name)
	throws IllegalAccessException, InvocationTargetException,
	NoSuchMethodException, ClassNotFoundException {
	try {
	Class.forName(name).getMethod("install").invoke(null);
	} catch (InvocationTargetException e) {
	if (e.getCause() instanceof RuntimeException)
	throw (RuntimeException) e.getCause();
	if (e.getCause() instanceof Error)
	throw (Error) e.getCause();
	throw e;
	}
	}

	/**
	* Configure the JRE's standard HTTP based on <code>http_proxy</code>.
	* <p>
	* The popular libcurl library honors the <code>http_proxy</code>
	* environment variable as a means of specifying an HTTP proxy for requests
	* made behind a firewall. This is not natively recognized by the JRE, so
	* this method can be used by command line utilities to configure the JRE
	* before the first request is sent.
	*
	* @throws MalformedURLException
	* the value in <code>http_proxy</code> is unsupportable.
	*/
	private static void configureHttpProxy() throws MalformedURLException {
	final String s = System.getenv("http_proxy");
	if (s == null \|\| s.equals(""))
	return;

	final URL u = new URL((s.indexOf("://") == -1) ? "http://" + s : s);
	if (!"http".equals(u.getProtocol()))
	throw new MalformedURLException(MessageFormat.format(CLIText.get().invalidHttpProxyOnlyHttpSupported, s));

	final String proxyHost = u.getHost();
	final int proxyPort = u.getPort();

	System.setProperty("http.proxyHost", proxyHost);
	if (proxyPort > 0)
	System.setProperty("http.proxyPort", String.valueOf(proxyPort));

	final String userpass = u.getUserInfo();
	if (userpass != null && userpass.contains(":")) {
	final int c = userpass.indexOf(':');
	final String user = userpass.substring(0, c);
	final String pass = userpass.substring(c + 1);
	CachedAuthenticator
	.add(new CachedAuthenticator.CachedAuthentication(
	proxyHost, proxyPort, user, pass));
	}
	}
	}