/*
* Copyright (C) 2008-2010, Google Inc.
* 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.
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package org.jboss.forge.git;
import java.io.File;
import java.io.IOException;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import org.eclipse.jgit.dircache.DirCache;
import org.eclipse.jgit.dircache.DirCacheCheckout;
import org.eclipse.jgit.errors.IncorrectObjectTypeException;
import org.eclipse.jgit.errors.MissingObjectException;
import org.eclipse.jgit.errors.NotSupportedException;
import org.eclipse.jgit.errors.TransportException;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.RefComparator;
import org.eclipse.jgit.lib.RefUpdate;
import org.eclipse.jgit.lib.TextProgressMonitor;
import org.eclipse.jgit.pgm.CLIText;
import org.eclipse.jgit.pgm.Die;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevWalk;
import org.eclipse.jgit.storage.file.FileBasedConfig;
import org.eclipse.jgit.storage.file.FileRepository;
import org.eclipse.jgit.transport.FetchResult;
import org.eclipse.jgit.transport.RefSpec;
import org.eclipse.jgit.transport.RemoteConfig;
import org.eclipse.jgit.transport.TagOpt;
import org.eclipse.jgit.transport.Transport;
import org.eclipse.jgit.transport.URIish;
/**
* @author <a href="mailto:lincolnbaxter@gmail.com">Lincoln Baxter, III</a>
*
*/
public class Clone
{
private final String remoteName = Constants.DEFAULT_REMOTE_NAME;
private FileRepository db;
public void run(File projectDir, String sourceUri) throws IOException
{
try
{
final URIish uri = new URIish(sourceUri);
File gitdir = new File(projectDir, Constants.DOT_GIT);
db = new FileRepository(gitdir);
db.create();
final FileBasedConfig dstcfg = db.getConfig();
dstcfg.setBoolean("core", null, "bare", false);
dstcfg.save();
saveRemote(uri);
final FetchResult r = runFetch();
final Ref branch = guessHEAD(r);
doCheckout(branch);
}
catch (URISyntaxException e)
{
throw new IllegalArgumentException("Failed to parse remote repository URI", e);
}
}
private void saveRemote(final URIish uri) throws URISyntaxException,
IOException
{
final FileBasedConfig dstcfg = db.getConfig();
final RemoteConfig rc = new RemoteConfig(dstcfg, remoteName);
rc.addURI(uri);
rc.addFetchRefSpec(new RefSpec().setForceUpdate(true)
.setSourceDestination(Constants.R_HEADS + "*",
Constants.R_REMOTES + remoteName + "/*"));
rc.update(dstcfg);
dstcfg.save();
}
private FetchResult runFetch() throws NotSupportedException,
URISyntaxException, TransportException
{
final Transport tn = Transport.open(db, remoteName);
final FetchResult r;
try
{
tn.setTagOpt(TagOpt.FETCH_TAGS);
r = tn.fetch(new TextProgressMonitor(), null);
}
finally
{
tn.close();
}
return r;
}
private Ref guessHEAD(final FetchResult result)
{
final Ref idHEAD = result.getAdvertisedRef(Constants.HEAD);
final List<Ref> availableRefs = new ArrayList<Ref>();
Ref head = null;
for (final Ref r : result.getAdvertisedRefs())
{
final String n = r.getName();
if (!n.startsWith(Constants.R_HEADS))
continue;
availableRefs.add(r);
if (idHEAD == null || head != null)
continue;
if (r.getObjectId().equals(idHEAD.getObjectId()))
head = r;
}
Collections.sort(availableRefs, RefComparator.INSTANCE);
if (idHEAD != null && head == null)
head = idHEAD;
return head;
}
private void doCheckout(final Ref branch) throws IOException
{
if (branch == null)
throw new Die(CLIText.get().cannotChekoutNoHeadsAdvertisedByRemote);
if (!Constants.HEAD.equals(branch.getName()))
{
RefUpdate u = db.updateRef(Constants.HEAD);
u.disableRefLog();
u.link(branch.getName());
}
final RevCommit commit = parseCommit(branch);
final RefUpdate u = db.updateRef(Constants.HEAD);
u.setNewObjectId(commit);
u.forceUpdate();
DirCache dc = db.lockDirCache();
DirCacheCheckout co = new DirCacheCheckout(db, dc, commit.getTree());
co.checkout();
}
private RevCommit parseCommit(final Ref branch)
throws MissingObjectException, IncorrectObjectTypeException,
IOException
{
final RevWalk rw = new RevWalk(db);
final RevCommit commit;
try
{
commit = rw.parseCommit(branch.getObjectId());
}
finally
{
rw.release();
}
return commit;
}
}