/*
* Copyright (C) 2010, Chris Aniszczyk <caniszczyk@gmail.com>
* Copyright (C) 2011, Matthias Sohn <matthias.sohn@sap.com>
* 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.api;
import java.io.File;
import java.io.IOException;
import java.text.MessageFormat;
import java.util.LinkedList;
import java.util.List;
import org.eclipse.jgit.JGitText;
import org.eclipse.jgit.api.CheckoutResult.Status;
import org.eclipse.jgit.api.errors.InvalidRefNameException;
import org.eclipse.jgit.api.errors.JGitInternalException;
import org.eclipse.jgit.api.errors.RefAlreadyExistsException;
import org.eclipse.jgit.api.errors.RefNotFoundException;
import org.eclipse.jgit.dircache.DirCache;
import org.eclipse.jgit.dircache.DirCacheCheckout;
import org.eclipse.jgit.dircache.DirCacheEditor;
import org.eclipse.jgit.dircache.DirCacheEditor.PathEdit;
import org.eclipse.jgit.dircache.DirCacheEntry;
import org.eclipse.jgit.dircache.DirCacheIterator;
import org.eclipse.jgit.errors.AmbiguousObjectException;
import org.eclipse.jgit.errors.CheckoutConflictException;
import org.eclipse.jgit.lib.AnyObjectId;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.FileMode;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.ObjectReader;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.RefUpdate;
import org.eclipse.jgit.lib.RefUpdate.Result;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevTree;
import org.eclipse.jgit.revwalk.RevWalk;
import org.eclipse.jgit.treewalk.TreeWalk;
import org.eclipse.jgit.treewalk.filter.PathFilterGroup;
/**
* Checkout a branch to the working tree
*
* @see <a
* href="http://www.kernel.org/pub/software/scm/git/docs/git-checkout.html"
* >Git documentation about Checkout</a>
*/
public class CheckoutCommand extends GitCommand<Ref> {
private String name;
private boolean force = false;
private boolean createBranch = false;
private CreateBranchCommand.SetupUpstreamMode upstreamMode;
private String startPoint = null;
private RevCommit startCommit;
private CheckoutResult status;
private List<String> paths;
/**
* @param repo
*/
protected CheckoutCommand(Repository repo) {
super(repo);
this.paths = new LinkedList<String>();
}
/**
* @throws RefAlreadyExistsException
* when trying to create (without force) a branch with a name
* that already exists
* @throws RefNotFoundException
* if the start point or branch can not be found
* @throws InvalidRefNameException
* if the provided name is <code>null</code> or otherwise
* invalid
* @return the newly created branch
*/
public Ref call() throws JGitInternalException, RefAlreadyExistsException,
RefNotFoundException, InvalidRefNameException {
checkCallable();
processOptions();
try {
if (!paths.isEmpty()) {
checkoutPaths();
status = CheckoutResult.OK_RESULT;
setCallable(false);
return null;
}
if (createBranch) {
Git git = new Git(repo);
CreateBranchCommand command = git.branchCreate();
command.setName(name);
command.setStartPoint(getStartPoint().name());
if (upstreamMode != null)
command.setUpstreamMode(upstreamMode);
command.call();
}
Ref headRef = repo.getRef(Constants.HEAD);
String shortHeadRef = getShortBranchName(headRef);
String refLogMessage = "checkout: moving from " + shortHeadRef;
ObjectId branch = repo.resolve(name);
if (branch == null)
throw new RefNotFoundException(MessageFormat.format(JGitText
.get().refNotResolved, name));
RevWalk revWalk = new RevWalk(repo);
AnyObjectId headId = headRef.getObjectId();
RevCommit headCommit = headId == null ? null : revWalk
.parseCommit(headId);
RevCommit newCommit = revWalk.parseCommit(branch);
RevTree headTree = headCommit == null ? null : headCommit.getTree();
DirCacheCheckout dco = new DirCacheCheckout(repo, headTree,
repo.lockDirCache(), newCommit.getTree());
dco.setFailOnConflict(true);
try {
dco.checkout();
} catch (CheckoutConflictException e) {
status = new CheckoutResult(Status.CONFLICTS, dco
.getConflicts());
throw e;
}
Ref ref = repo.getRef(name);
if (ref != null && !ref.getName().startsWith(Constants.R_HEADS))
ref = null;
String toName = Repository.shortenRefName(name);
RefUpdate refUpdate = repo.updateRef(Constants.HEAD, ref == null);
refUpdate.setForceUpdate(force);
refUpdate.setRefLogMessage(refLogMessage + " to " + toName, false);
Result updateResult;
if (ref != null)
updateResult = refUpdate.link(ref.getName());
else {
refUpdate.setNewObjectId(newCommit);
updateResult = refUpdate.forceUpdate();
}
setCallable(false);
boolean ok = false;
switch (updateResult) {
case NEW:
ok = true;
break;
case NO_CHANGE:
case FAST_FORWARD:
case FORCED:
ok = true;
break;
default:
break;
}
if (!ok)
throw new JGitInternalException(MessageFormat.format(JGitText
.get().checkoutUnexpectedResult, updateResult.name()));
if (!dco.getToBeDeleted().isEmpty()) {
status = new CheckoutResult(Status.NONDELETED, dco
.getToBeDeleted());
}
else
status = CheckoutResult.OK_RESULT;
return ref;
} catch (IOException ioe) {
throw new JGitInternalException(ioe.getMessage(), ioe);
} finally {
if (status == null)
status = CheckoutResult.ERROR_RESULT;
}
}
private String getShortBranchName(Ref headRef) {
if (headRef.getTarget().getName().equals(headRef.getName()))
return headRef.getTarget().getObjectId().getName();
return Repository.shortenRefName(headRef.getTarget().getName());
}
/**
* @param path
* Path to update in the working tree and index.
* @return {@code this}
*/
public CheckoutCommand addPath(String path) {
checkCallable();
this.paths.add(path);
return this;
}
/**
* Checkout paths into index and working directory
*
* @return this instance
* @throws IOException
* @throws RefNotFoundException
*/
protected CheckoutCommand checkoutPaths() throws IOException,
RefNotFoundException {
RevWalk revWalk = new RevWalk(repo);
DirCache dc = repo.lockDirCache();
try {
DirCacheEditor editor = dc.editor();
TreeWalk startWalk = new TreeWalk(revWalk.getObjectReader());
startWalk.setRecursive(true);
startWalk.setFilter(PathFilterGroup.createFromStrings(paths));
boolean checkoutIndex = startCommit == null && startPoint == null;
if (!checkoutIndex)
startWalk.addTree(revWalk.parseCommit(getStartPoint())
.getTree());
else
startWalk.addTree(new DirCacheIterator(dc));
final File workTree = repo.getWorkTree();
final ObjectReader r = repo.getObjectDatabase().newReader();
try {
while (startWalk.next()) {
final ObjectId blobId = startWalk.getObjectId(0);
final FileMode mode = startWalk.getFileMode(0);
editor.add(new PathEdit(startWalk.getPathString()) {
public void apply(DirCacheEntry ent) {
ent.setObjectId(blobId);
ent.setFileMode(mode);
try {
DirCacheCheckout.checkoutEntry(repo, new File(
workTree, ent.getPathString()), ent, r);
} catch (IOException e) {
throw new JGitInternalException(
MessageFormat.format(
JGitText.get().checkoutConflictWithFile,
ent.getPathString()), e);
}
}
});
}
editor.commit();
} finally {
startWalk.release();
r.release();
}
} finally {
dc.unlock();
revWalk.release();
}
return this;
}
private ObjectId getStartPoint() throws AmbiguousObjectException,
RefNotFoundException, IOException {
if (startCommit != null)
return startCommit.getId();
ObjectId result = null;
try {
result = repo.resolve((startPoint == null) ? Constants.HEAD
: startPoint);
} catch (AmbiguousObjectException e) {
throw e;
}
if (result == null)
throw new RefNotFoundException(MessageFormat.format(
JGitText.get().refNotResolved,
startPoint != null ? startPoint : Constants.HEAD));
return result;
}
private void processOptions() throws InvalidRefNameException {
if (paths.isEmpty()
&& (name == null || !Repository
.isValidRefName(Constants.R_HEADS + name)))
throw new InvalidRefNameException(MessageFormat.format(JGitText
.get().branchNameInvalid, name == null ? "<null>" : name));
}
/**
* @param name
* the name of the new branch
* @return this instance
*/
public CheckoutCommand setName(String name) {
checkCallable();
this.name = name;
return this;
}
/**
* @param createBranch
* if <code>true</code> a branch will be created as part of the
* checkout and set to the specified start point
* @return this instance
*/
public CheckoutCommand setCreateBranch(boolean createBranch) {
checkCallable();
this.createBranch = createBranch;
return this;
}
/**
* @param force
* if <code>true</code> and the branch with the given name
* already exists, the start-point of an existing branch will be
* set to a new start-point; if false, the existing branch will
* not be changed
* @return this instance
*/
public CheckoutCommand setForce(boolean force) {
checkCallable();
this.force = force;
return this;
}
/**
* @param startPoint
* corresponds to the start-point option; if <code>null</code>,
* the current HEAD will be used
* @return this instance
*/
public CheckoutCommand setStartPoint(String startPoint) {
checkCallable();
this.startPoint = startPoint;
this.startCommit = null;
return this;
}
/**
* @param startCommit
* corresponds to the start-point option; if <code>null</code>,
* the current HEAD will be used
* @return this instance
*/
public CheckoutCommand setStartPoint(RevCommit startCommit) {
checkCallable();
this.startCommit = startCommit;
this.startPoint = null;
return this;
}
/**
* @param mode
* corresponds to the --track/--no-track options; may be
* <code>null</code>
* @return this instance
*/
public CheckoutCommand setUpstreamMode(
CreateBranchCommand.SetupUpstreamMode mode) {
checkCallable();
this.upstreamMode = mode;
return this;
}
/**
* @return the result
*/
public CheckoutResult getResult() {
if (status == null)
return CheckoutResult.NOT_TRIED_RESULT;
return status;
}
}