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 static java.nio.charset.StandardCharsets.UTF_8;

 import java.io.File;
 import java.io.IOException;
 import java.io.OutputStreamWriter;
 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.List;
 import java.util.Locale;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 import java.util.concurrent.ThreadFactory;
 import java.util.concurrent.TimeUnit;

 import org.eclipse.jgit.awtui.AwtAuthenticator;
 import org.eclipse.jgit.awtui.AwtCredentialsProvider;
 import org.eclipse.jgit.errors.TransportException;
 import org.eclipse.jgit.lfs.BuiltinLFS;
 import org.eclipse.jgit.lib.Repository;
 import org.eclipse.jgit.lib.RepositoryBuilder;
 import org.eclipse.jgit.pgm.internal.CLIText;
 import org.eclipse.jgit.pgm.opt.CmdLineParser;
 import org.eclipse.jgit.pgm.opt.SubcommandHandler;
 import org.eclipse.jgit.transport.HttpTransport;
 import org.eclipse.jgit.transport.http.apache.HttpClientConnectionFactory;
 import org.eclipse.jgit.util.CachedAuthenticator;
 import org.kohsuke.args4j.Argument;
 import org.kohsuke.args4j.CmdLineException;
 import org.kohsuke.args4j.Option;
 import org.kohsuke.args4j.OptionHandlerFilter;

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

 	@Option(name = "--version", usage = "usage_displayVersion")
 	private boolean version;

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

 	@Option(name = "--git-dir", metaVar = "metaVar_gitDir", usage = "usage_setTheGitRepositoryToOperateOn")
 	private String 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<>();

 	PrintWriter writer;

 	private ExecutorService gcExecutor;

 	/**
 	 * <p>Constructor for Main.</p>
 	 */
 	public Main() {
 		HttpTransport.setConnectionFactory(new HttpClientConnectionFactory());
 		BuiltinLFS.register();
 		gcExecutor = Executors.newSingleThreadExecutor(new ThreadFactory() {
 			private final ThreadFactory baseFactory = Executors
 					.defaultThreadFactory();

 			@Override
 			public Thread newThread(Runnable taskBody) {
 				Thread thr = baseFactory.newThread(taskBody);
 				thr.setName("JGit-autoGc"); //$NON-NLS-1$
 				return thr;
 			}
 		});
 	}

 	/**
 	 * Execute the command line.
 	 *
 	 * @param argv
 	 *            arguments.
 	 * @throws java.lang.Exception
 	 */
 	public static void main(String[] argv) throws Exception {
 		// make sure built-in filters are registered
 		BuiltinLFS.register();

 		new Main().run(argv);
 	}

 	/**
 	 * Parse the command line and execute the requested action.
 	 *
 	 * Subclasses should allocate themselves and then invoke this method:
 	 *
 	 * <pre>
 	 * class ExtMain {
 	 * 	public static void main(String[] argv) {
 	 * 		new ExtMain().run(argv);
 	 * 	}
 	 * }
 	 * </pre>
 	 *
 	 * @param argv
 	 *            arguments.
 	 * @throws java.lang.Exception
 	 */
 	protected void run(String[] argv) throws Exception {
 		writer = createErrorWriter();
 		try {
 			if (!installConsole()) {
 				AwtAuthenticator.install();
 				AwtCredentialsProvider.install();
 			}
 			configureHttpProxy();
 			execute(argv);
 		} catch (Die err) {
 			if (err.isAborted()) {
 				exit(1, err);
 			}
 			writer.println(CLIText.fatalError(err.getMessage()));
 			if (showStackTrace) {
 				err.printStackTrace(writer);
 			}
 			exit(128, err);
 		} catch (Exception err) {
 			// Try to detect errno == EPIPE and exit normally if that happens
 			// There may be issues with operating system versions and locale,
 			// but we can probably assume that these messages will not be thrown
 			// under other circumstances.
 			if (err.getClass() == IOException.class) {
 				// Linux, OS X
 				if (err.getMessage().equals("Broken pipe")) { //$NON-NLS-1$
 					exit(0, err);
 				}
 				// Windows
 				if (err.getMessage().equals("The pipe is being closed")) { //$NON-NLS-1$
 					exit(0, err);
 				}
 			}
 			if (!showStackTrace && err.getCause() != null
 					&& err instanceof TransportException) {
 				writer.println(CLIText.fatalError(err.getCause().getMessage()));
 			}

 			if (err.getClass().getName().startsWith("org.eclipse.jgit.errors.")) { //$NON-NLS-1$
 				writer.println(CLIText.fatalError(err.getMessage()));
 				if (showStackTrace) {
 					err.printStackTrace();
 				}
 				exit(128, err);
 			}
 			err.printStackTrace();
 			exit(1, err);
 		}
 		if (System.out.checkError()) {
 			writer.println(CLIText.get().unknownIoErrorStdout);
 			exit(1, null);
 		}
 		if (writer.checkError()) {
 			// No idea how to present an error here, most likely disk full or
 			// broken pipe
 			exit(1, null);
 		}
 		gcExecutor.shutdown();
 		gcExecutor.awaitTermination(10, TimeUnit.MINUTES);
 	}

 	PrintWriter createErrorWriter() {
 		return new PrintWriter(new OutputStreamWriter(System.err, UTF_8));
 	}

 	private void execute(String[] argv) throws Exception {
 		final CmdLineParser clp = new SubcommandLineParser(this);

 		try {
 			clp.parseArgument(argv);
 		} catch (CmdLineException err) {
 			if (argv.length > 0 && !help && !version) {
 				writer.println(CLIText.fatalError(err.getMessage()));
 				writer.flush();
 				exit(1, err);
 			}
 		}

 		if (argv.length == 0 || help) {
 			final String ex = clp.printExample(OptionHandlerFilter.ALL,
 					CLIText.get().resourceBundle());
 			writer.println("jgit" + ex + " command [ARG ...]"); //$NON-NLS-1$ //$NON-NLS-2$
 			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 (CommandRef c : common) {
 					width = Math.max(width, c.getName().length());
 				}
 				width += 2;

 				for (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();
 			exit(1, null);
 		}

 		if (version) {
 			String cmdId = Version.class.getSimpleName()
 					.toLowerCase(Locale.ROOT);
 			subcommand = CommandCatalog.get(cmdId).create();
 		}

 		final TextBuiltin cmd = subcommand;
 		init(cmd);
 		try {
 			cmd.execute(arguments.toArray(new String[0]));
 		} finally {
 			if (cmd.outw != null) {
 				cmd.outw.flush();
 			}
 			if (cmd.errw != null) {
 				cmd.errw.flush();
 			}
 		}
 	}

 	void init(TextBuiltin cmd) throws IOException {
 		if (cmd.requiresRepository()) {
 			cmd.init(openGitDir(gitdir), null);
 		} else {
 			cmd.init(null, gitdir);
 		}
 	}

 	/**
 	 * @param status
 	 * @param t
 	 *            can be {@code null}
 	 * @throws Exception
 	 */
 	void exit(int status, Exception t) throws Exception {
 		writer.flush();
 		System.exit(status);
 	}

 	/**
 	 * Evaluate the {@code --git-dir} option and open the repository.
 	 *
 	 * @param aGitdir
 	 *            the {@code --git-dir} option given on the command line. May be
 	 *            null if it was not supplied.
 	 * @return the repository to operate on.
 	 * @throws java.io.IOException
 	 *             the repository cannot be opened.
 	 */
 	protected Repository openGitDir(String aGitdir) throws IOException {
 		RepositoryBuilder rb = new RepositoryBuilder() //
 				.setGitDir(aGitdir != null ? new File(aGitdir) : null) //
 				.readEnvironment() //
 				.findGitDir();
 		if (rb.getGitDir() == null)
 			throw new Die(CLIText.get().cantFindGitDirectory);
 		return rb.build();
 	}

 	private static boolean installConsole() {
 		try {
 			install("org.eclipse.jgit.console.ConsoleAuthenticator"); //$NON-NLS-1$
 			install("org.eclipse.jgit.console.ConsoleCredentialsProvider"); //$NON-NLS-1$
 			return true;
 		} catch (ClassNotFoundException | NoClassDefFoundError
 				| UnsupportedClassVersionError e) {
 			return false;
 		} catch (IllegalArgumentException | SecurityException
 				| IllegalAccessException | InvocationTargetException
 				| NoSuchMethodException e) {
 			throw new RuntimeException(CLIText.get().cannotSetupConsole, e);
 		}
 	}

 	private static void install(String name)
 			throws IllegalAccessException, InvocationTargetException,
 			NoSuchMethodException, ClassNotFoundException {
 		try {
 			Class.forName(name).getMethod("install").invoke(null); //$NON-NLS-1$
 		} 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>,
 	 * <code>https_proxy</code> environment variables as a means of specifying
 	 * an HTTP/S 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. The
 	 * information found in the environment variables is copied to the
 	 * associated system properties. This is not done when the system properties
 	 * are already set. The default way of telling java programs about proxies
 	 * (the system properties) takes precedence over environment variables.
 	 *
 	 * @throws MalformedURLException
 	 *             the value in <code>http_proxy</code> or
 	 *             <code>https_proxy</code> is unsupportable.
 	 */
 	static void configureHttpProxy() throws MalformedURLException {
 		for (String protocol : new String[] { "http", "https" }) { //$NON-NLS-1$ //$NON-NLS-2$
 			if (System.getProperty(protocol + ".proxyHost") != null) { //$NON-NLS-1$
 				continue;
 			}
 			String s = System.getenv(protocol + "_proxy"); //$NON-NLS-1$
 			if (s == null && protocol.equals("https")) { //$NON-NLS-1$
 				s = System.getenv("HTTPS_PROXY"); //$NON-NLS-1$
 			}
 			if (s == null || s.isEmpty()) {
 				continue;
 			}

 			final URL u = new URL(
 					(!s.contains("://")) ? protocol + "://" + s : s); //$NON-NLS-1$ //$NON-NLS-2$
 			if (!u.getProtocol().startsWith("http")) //$NON-NLS-1$
 				throw new MalformedURLException(MessageFormat.format(
 						CLIText.get().invalidHttpProxyOnlyHttpSupported, s));

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

 			System.setProperty(protocol + ".proxyHost", proxyHost); //$NON-NLS-1$
 			if (proxyPort > 0)
 				System.setProperty(protocol + ".proxyPort", //$NON-NLS-1$
 						String.valueOf(proxyPort));

 			final String userpass = u.getUserInfo();
 			if (userpass != null && userpass.contains(":")) { //$NON-NLS-1$
 				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));
 			}
 		}
 	}

 	/**
 	 * Parser for subcommands which doesn't stop parsing on help options and so
 	 * proceeds all specified options
 	 */
 	static class SubcommandLineParser extends CmdLineParser {
 		public SubcommandLineParser(Object bean) {
 			super(bean);
 		}

 		@Override
 		protected boolean containsHelp(String... args) {
 			return false;
 		}
 	}
 }
	/*
	* 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 static java.nio.charset.StandardCharsets.UTF_8;

	import java.io.File;
	import java.io.IOException;
	import java.io.OutputStreamWriter;
	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.List;
	import java.util.Locale;
	import java.util.concurrent.ExecutorService;
	import java.util.concurrent.Executors;
	import java.util.concurrent.ThreadFactory;
	import java.util.concurrent.TimeUnit;

	import org.eclipse.jgit.awtui.AwtAuthenticator;
	import org.eclipse.jgit.awtui.AwtCredentialsProvider;
	import org.eclipse.jgit.errors.TransportException;
	import org.eclipse.jgit.lfs.BuiltinLFS;
	import org.eclipse.jgit.lib.Repository;
	import org.eclipse.jgit.lib.RepositoryBuilder;
	import org.eclipse.jgit.pgm.internal.CLIText;
	import org.eclipse.jgit.pgm.opt.CmdLineParser;
	import org.eclipse.jgit.pgm.opt.SubcommandHandler;
	import org.eclipse.jgit.transport.HttpTransport;
	import org.eclipse.jgit.transport.http.apache.HttpClientConnectionFactory;
	import org.eclipse.jgit.util.CachedAuthenticator;
	import org.kohsuke.args4j.Argument;
	import org.kohsuke.args4j.CmdLineException;
	import org.kohsuke.args4j.Option;
	import org.kohsuke.args4j.OptionHandlerFilter;

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

	@Option(name = "--version", usage = "usage_displayVersion")
	private boolean version;

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

	@Option(name = "--git-dir", metaVar = "metaVar_gitDir", usage = "usage_setTheGitRepositoryToOperateOn")
	private String 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<>();

	PrintWriter writer;

	private ExecutorService gcExecutor;

	/**
	* <p>Constructor for Main.</p>
	*/
	public Main() {
	HttpTransport.setConnectionFactory(new HttpClientConnectionFactory());
	BuiltinLFS.register();
	gcExecutor = Executors.newSingleThreadExecutor(new ThreadFactory() {
	private final ThreadFactory baseFactory = Executors
	.defaultThreadFactory();

	@Override
	public Thread newThread(Runnable taskBody) {
	Thread thr = baseFactory.newThread(taskBody);
	thr.setName("JGit-autoGc"); //$NON-NLS-1$
	return thr;
	}
	});
	}

	/**
	* Execute the command line.
	*
	* @param argv
	* arguments.
	* @throws java.lang.Exception
	*/
	public static void main(String[] argv) throws Exception {
	// make sure built-in filters are registered
	BuiltinLFS.register();

	new Main().run(argv);
	}

	/**
	* Parse the command line and execute the requested action.
	*
	* Subclasses should allocate themselves and then invoke this method:
	*
	* <pre>
	* class ExtMain {
	* public static void main(String[] argv) {
	* new ExtMain().run(argv);
	* }
	* }
	* </pre>
	*
	* @param argv
	* arguments.
	* @throws java.lang.Exception
	*/
	protected void run(String[] argv) throws Exception {
	writer = createErrorWriter();
	try {
	if (!installConsole()) {
	AwtAuthenticator.install();
	AwtCredentialsProvider.install();
	}
	configureHttpProxy();
	execute(argv);
	} catch (Die err) {
	if (err.isAborted()) {
	exit(1, err);
	}
	writer.println(CLIText.fatalError(err.getMessage()));
	if (showStackTrace) {
	err.printStackTrace(writer);
	}
	exit(128, err);
	} catch (Exception err) {
	// Try to detect errno == EPIPE and exit normally if that happens
	// There may be issues with operating system versions and locale,
	// but we can probably assume that these messages will not be thrown
	// under other circumstances.
	if (err.getClass() == IOException.class) {
	// Linux, OS X
	if (err.getMessage().equals("Broken pipe")) { //$NON-NLS-1$
	exit(0, err);
	}
	// Windows
	if (err.getMessage().equals("The pipe is being closed")) { //$NON-NLS-1$
	exit(0, err);
	}
	}
	if (!showStackTrace && err.getCause() != null
	&& err instanceof TransportException) {
	writer.println(CLIText.fatalError(err.getCause().getMessage()));
	}

	if (err.getClass().getName().startsWith("org.eclipse.jgit.errors.")) { //$NON-NLS-1$
	writer.println(CLIText.fatalError(err.getMessage()));
	if (showStackTrace) {
	err.printStackTrace();
	}
	exit(128, err);
	}
	err.printStackTrace();
	exit(1, err);
	}
	if (System.out.checkError()) {
	writer.println(CLIText.get().unknownIoErrorStdout);
	exit(1, null);
	}
	if (writer.checkError()) {
	// No idea how to present an error here, most likely disk full or
	// broken pipe
	exit(1, null);
	}
	gcExecutor.shutdown();
	gcExecutor.awaitTermination(10, TimeUnit.MINUTES);
	}

	PrintWriter createErrorWriter() {
	return new PrintWriter(new OutputStreamWriter(System.err, UTF_8));
	}

	private void execute(String[] argv) throws Exception {
	final CmdLineParser clp = new SubcommandLineParser(this);

	try {
	clp.parseArgument(argv);
	} catch (CmdLineException err) {
	if (argv.length > 0 && !help && !version) {
	writer.println(CLIText.fatalError(err.getMessage()));
	writer.flush();
	exit(1, err);
	}
	}

	if (argv.length == 0 \|\| help) {
	final String ex = clp.printExample(OptionHandlerFilter.ALL,
	CLIText.get().resourceBundle());
	writer.println("jgit" + ex + " command [ARG ...]"); //$NON-NLS-1$ //$NON-NLS-2$
	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 (CommandRef c : common) {
	width = Math.max(width, c.getName().length());
	}
	width += 2;

	for (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();
	exit(1, null);
	}

	if (version) {
	String cmdId = Version.class.getSimpleName()
	.toLowerCase(Locale.ROOT);
	subcommand = CommandCatalog.get(cmdId).create();
	}

	final TextBuiltin cmd = subcommand;
	init(cmd);
	try {
	cmd.execute(arguments.toArray(new String[0]));
	} finally {
	if (cmd.outw != null) {
	cmd.outw.flush();
	}
	if (cmd.errw != null) {
	cmd.errw.flush();
	}
	}
	}

	void init(TextBuiltin cmd) throws IOException {
	if (cmd.requiresRepository()) {
	cmd.init(openGitDir(gitdir), null);
	} else {
	cmd.init(null, gitdir);
	}
	}

	/**
	* @param status
	* @param t
	* can be {@code null}
	* @throws Exception
	*/
	void exit(int status, Exception t) throws Exception {
	writer.flush();
	System.exit(status);
	}

	/**
	* Evaluate the {@code --git-dir} option and open the repository.
	*
	* @param aGitdir
	* the {@code --git-dir} option given on the command line. May be
	* null if it was not supplied.
	* @return the repository to operate on.
	* @throws java.io.IOException
	* the repository cannot be opened.
	*/
	protected Repository openGitDir(String aGitdir) throws IOException {
	RepositoryBuilder rb = new RepositoryBuilder() //
	.setGitDir(aGitdir != null ? new File(aGitdir) : null) //
	.readEnvironment() //
	.findGitDir();
	if (rb.getGitDir() == null)
	throw new Die(CLIText.get().cantFindGitDirectory);
	return rb.build();
	}

	private static boolean installConsole() {
	try {
	install("org.eclipse.jgit.console.ConsoleAuthenticator"); //$NON-NLS-1$
	install("org.eclipse.jgit.console.ConsoleCredentialsProvider"); //$NON-NLS-1$
	return true;
	} catch (ClassNotFoundException \| NoClassDefFoundError
	\| UnsupportedClassVersionError e) {
	return false;
	} catch (IllegalArgumentException \| SecurityException
	\| IllegalAccessException \| InvocationTargetException
	\| NoSuchMethodException e) {
	throw new RuntimeException(CLIText.get().cannotSetupConsole, e);
	}
	}

	private static void install(String name)
	throws IllegalAccessException, InvocationTargetException,
	NoSuchMethodException, ClassNotFoundException {
	try {
	Class.forName(name).getMethod("install").invoke(null); //$NON-NLS-1$
	} 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>,
	* <code>https_proxy</code> environment variables as a means of specifying
	* an HTTP/S 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. The
	* information found in the environment variables is copied to the
	* associated system properties. This is not done when the system properties
	* are already set. The default way of telling java programs about proxies
	* (the system properties) takes precedence over environment variables.
	*
	* @throws MalformedURLException
	* the value in <code>http_proxy</code> or
	* <code>https_proxy</code> is unsupportable.
	*/
	static void configureHttpProxy() throws MalformedURLException {
	for (String protocol : new String[] { "http", "https" }) { //$NON-NLS-1$ //$NON-NLS-2$
	if (System.getProperty(protocol + ".proxyHost") != null) { //$NON-NLS-1$
	continue;
	}
	String s = System.getenv(protocol + "_proxy"); //$NON-NLS-1$
	if (s == null && protocol.equals("https")) { //$NON-NLS-1$
	s = System.getenv("HTTPS_PROXY"); //$NON-NLS-1$
	}
	if (s == null \|\| s.isEmpty()) {
	continue;
	}

	final URL u = new URL(
	(!s.contains("://")) ? protocol + "://" + s : s); //$NON-NLS-1$ //$NON-NLS-2$
	if (!u.getProtocol().startsWith("http")) //$NON-NLS-1$
	throw new MalformedURLException(MessageFormat.format(
	CLIText.get().invalidHttpProxyOnlyHttpSupported, s));

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

	System.setProperty(protocol + ".proxyHost", proxyHost); //$NON-NLS-1$
	if (proxyPort > 0)
	System.setProperty(protocol + ".proxyPort", //$NON-NLS-1$
	String.valueOf(proxyPort));

	final String userpass = u.getUserInfo();
	if (userpass != null && userpass.contains(":")) { //$NON-NLS-1$
	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));
	}
	}
	}

	/**
	* Parser for subcommands which doesn't stop parsing on help options and so
	* proceeds all specified options
	*/
	static class SubcommandLineParser extends CmdLineParser {
	public SubcommandLineParser(Object bean) {
	super(bean);
	}

	@Override
	protected boolean containsHelp(String... args) {
	return false;
	}
	}
	}