org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/Clone.java

   1 /*
   2  * Copyright (C) 2008-2010, Google Inc.
   3  * and other copyright owners as documented in the project's IP log.
   4  *
   5  * This program and the accompanying materials are made available
   6  * under the terms of the Eclipse Distribution License v1.0 which
   7  * accompanies this distribution, is reproduced below, and is
   8  * available at http://www.eclipse.org/org/documents/edl-v10.php
   9  *
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or
  13  * without modification, are permitted provided that the following
  14  * conditions are met:
  15  *
  16  * - Redistributions of source code must retain the above copyright
  17  *   notice, this list of conditions and the following disclaimer.
  18  *
  19  * - Redistributions in binary form must reproduce the above
  20  *   copyright notice, this list of conditions and the following
  21  *   disclaimer in the documentation and/or other materials provided
  22  *   with the distribution.
  23  *
  24  * - Neither the name of the Eclipse Foundation, Inc. nor the
  25  *   names of its contributors may be used to endorse or promote
  26  *   products derived from this software without specific prior
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  28  *
  29  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
  30  * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
  31  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  32  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  33  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  34  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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  40  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  41  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  42  */
  43
  44 package org.eclipse.jgit.pgm;
  45
  46 import java.io.File;
  47 import java.io.IOException;
  48 import java.net.URISyntaxException;
  49 import java.util.ArrayList;
  50 import java.util.Collections;
  51 import java.util.List;
  52
  53 import org.kohsuke.args4j.Argument;
  54 import org.kohsuke.args4j.Option;
  55 import org.eclipse.jgit.errors.NotSupportedException;
  56 import org.eclipse.jgit.errors.TransportException;
  57 import org.eclipse.jgit.lib.Commit;
  58 import org.eclipse.jgit.lib.Constants;
  59 import org.eclipse.jgit.lib.GitIndex;
  60 import org.eclipse.jgit.lib.Ref;
  61 import org.eclipse.jgit.lib.RefComparator;
  62 import org.eclipse.jgit.lib.RefUpdate;
  63 import org.eclipse.jgit.lib.Repository;
  64 import org.eclipse.jgit.lib.TextProgressMonitor;
  65 import org.eclipse.jgit.lib.Tree;
  66 import org.eclipse.jgit.lib.WorkDirCheckout;
  67 import org.eclipse.jgit.transport.FetchResult;
  68 import org.eclipse.jgit.transport.RefSpec;
  69 import org.eclipse.jgit.transport.RemoteConfig;
  70 import org.eclipse.jgit.transport.Transport;
  71 import org.eclipse.jgit.transport.URIish;
  72
  73 @Command(common = true, usage = "Clone a repository into a new directory")
  74 class Clone extends AbstractFetchCommand {
  75         @Option(name = "--origin", aliases = { "-o" }, metaVar = "name", usage = "use <name> instead of 'origin' to track upstream")
  76         private String remoteName = Constants.DEFAULT_REMOTE_NAME;
  77
  78         @Argument(index = 0, required = true, metaVar = "uri-ish")
  79         private String sourceUri;
  80
  81         @Argument(index = 1, metaVar = "directory")
  82         private String localName;
  83
  84         @Override
  85         protected final boolean requiresRepository() {
  86                 return false;
  87         }
  88
  89         @Override
  90         protected void run() throws Exception {
  91                 if (localName != null && gitdir != null)
  92                         throw die("conflicting usage of --git-dir and arguments");
  93
  94                 final URIish uri = new URIish(sourceUri);
  95                 if (localName == null) {
  96                         try {
  97                                 localName = uri.getHumanishName();
  98                         } catch (IllegalArgumentException e) {
  99                                 throw die("cannot guess local name from " + sourceUri);
 100                         }
 101                 }
 102                 if (gitdir == null)
 103                         gitdir = new File(localName, Constants.DOT_GIT);
 104
 105                 db = new Repository(gitdir);
 106                 db.create();
 107                 db.getConfig().setBoolean("core", null, "bare", false);
 108                 db.getConfig().save();
 109
 110                 out.println("Initialized empty Git repository in "
 111                                 + gitdir.getAbsolutePath());
 112                 out.flush();
 113
 114                 saveRemote(uri);
 115                 final FetchResult r = runFetch();
 116                 final Ref branch = guessHEAD(r);
 117                 doCheckout(branch);
 118         }
 119
 120         private void saveRemote(final URIish uri) throws URISyntaxException,
 121                         IOException {
 122                 final RemoteConfig rc = new RemoteConfig(db.getConfig(), remoteName);
 123                 rc.addURI(uri);
 124                 rc.addFetchRefSpec(new RefSpec().setForceUpdate(true)
 125                                 .setSourceDestination(Constants.R_HEADS + "*",
 126                                                 Constants.R_REMOTES + remoteName + "/*"));
 127                 rc.update(db.getConfig());
 128                 db.getConfig().save();
 129         }
 130
 131         private FetchResult runFetch() throws NotSupportedException,
 132                         URISyntaxException, TransportException {
 133                 final Transport tn = Transport.open(db, remoteName);
 134                 final FetchResult r;
 135                 try {
 136                         r = tn.fetch(new TextProgressMonitor(), null);
 137                 } finally {
 138                         tn.close();
 139                 }
 140                 showFetchResult(tn, r);
 141                 return r;
 142         }
 143
 144         private Ref guessHEAD(final FetchResult result) {
 145                 final Ref idHEAD = result.getAdvertisedRef(Constants.HEAD);
 146                 final List<Ref> availableRefs = new ArrayList<Ref>();
 147                 Ref head = null;
 148                 for (final Ref r : result.getAdvertisedRefs()) {
 149                         final String n = r.getName();
 150                         if (!n.startsWith(Constants.R_HEADS))
 151                                 continue;
 152                         availableRefs.add(r);
 153                         if (idHEAD == null || head != null)
 154                                 continue;
 155                         if (r.getObjectId().equals(idHEAD.getObjectId()))
 156                                 head = r;
 157                 }
 158                 Collections.sort(availableRefs, RefComparator.INSTANCE);
 159                 if (idHEAD != null && head == null)
 160                         head = idHEAD;
 161                 return head;
 162         }
 163
 164         private void doCheckout(final Ref branch) throws IOException {
 165                 if (branch == null)
 166                         throw die("cannot checkout; no HEAD advertised by remote");
 167                 if (!Constants.HEAD.equals(branch.getName())) {
 168                         RefUpdate u = db.updateRef(Constants.HEAD);
 169                         u.disableRefLog();
 170                         u.link(branch.getName());
 171                 }
 172
 173                 final Commit commit = db.mapCommit(branch.getObjectId());
 174                 final RefUpdate u = db.updateRef(Constants.HEAD);
 175                 u.setNewObjectId(commit.getCommitId());
 176                 u.forceUpdate();
 177
 178                 final GitIndex index = new GitIndex(db);
 179                 final Tree tree = commit.getTree();
 180                 final WorkDirCheckout co;
 181
 182                 co = new WorkDirCheckout(db, db.getWorkDir(), index, tree);
 183                 co.checkout();
 184                 index.write();
 185         }
 186 }