/*
* Copyright (C) 2010, Christian Halstrick <christian.halstrick@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
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package org.eclipse.jgit.api;
import java.io.IOException;
import java.text.MessageFormat;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import org.eclipse.jgit.api.MergeResult.MergeStatus;
import org.eclipse.jgit.api.errors.ConcurrentRefUpdateException;
import org.eclipse.jgit.api.errors.GitAPIException;
import org.eclipse.jgit.api.errors.JGitInternalException;
import org.eclipse.jgit.api.errors.MultipleParentsNotAllowedException;
import org.eclipse.jgit.api.errors.NoHeadException;
import org.eclipse.jgit.api.errors.NoMessageException;
import org.eclipse.jgit.api.errors.UnmergedPathsException;
import org.eclipse.jgit.api.errors.WrongRepositoryStateException;
import org.eclipse.jgit.dircache.DirCacheCheckout;
import org.eclipse.jgit.internal.JGitText;
import org.eclipse.jgit.lib.AnyObjectId;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.ObjectIdRef;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.Ref.Storage;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.merge.MergeMessageFormatter;
import org.eclipse.jgit.merge.MergeStrategy;
import org.eclipse.jgit.merge.ResolveMerger;
import org.eclipse.jgit.merge.ResolveMerger.MergeFailureReason;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevWalk;
import org.eclipse.jgit.treewalk.FileTreeIterator;
/**
* A class used to execute a {@code revert} command. It has setters for all
* supported options and arguments of this command and a {@link #call()} method
* to finally execute the command. Each instance of this class should only be
* used for one invocation of the command (means: one call to {@link #call()})
*
* @see <a
* href="http://www.kernel.org/pub/software/scm/git/docs/git-revert.html"
* >Git documentation about revert</a>
*/
public class RevertCommand extends GitCommand<RevCommit> {
private List<Ref> commits = new LinkedList<Ref>();
private String ourCommitName = null;
private List<Ref> revertedRefs = new LinkedList<Ref>();
private MergeResult failingResult;
private List<String> unmergedPaths;
private MergeStrategy strategy = MergeStrategy.RECURSIVE;
/**
* @param repo
*/
protected RevertCommand(Repository repo) {
super(repo);
}
/**
* Executes the {@code revert} command with all the options and parameters
* collected by the setter methods (e.g. {@link #include(Ref)} of this
* class. Each instance of this class should only be used for one invocation
* of the command. Don't call this method twice on an instance.
*
* @return on success the {@link RevCommit} pointed to by the new HEAD is
* returned. If a failure occurred during revert <code>null</code>
* is returned. The list of successfully reverted {@link Ref}'s can
* be obtained by calling {@link #getRevertedRefs()}
* @throws GitAPIException
* @throws WrongRepositoryStateException
* @throws ConcurrentRefUpdateException
* @throws UnmergedPathsException
* @throws NoMessageException
*/
public RevCommit call() throws NoMessageException, UnmergedPathsException,
ConcurrentRefUpdateException, WrongRepositoryStateException,
GitAPIException {
RevCommit newHead = null;
checkCallable();
RevWalk revWalk = new RevWalk(repo);
try {
// get the head commit
Ref headRef = repo.getRef(Constants.HEAD);
if (headRef == null)
throw new NoHeadException(
JGitText.get().commitOnRepoWithoutHEADCurrentlyNotSupported);
RevCommit headCommit = revWalk.parseCommit(headRef.getObjectId());
newHead = headCommit;
// loop through all refs to be reverted
for (Ref src : commits) {
// get the commit to be reverted
// handle annotated tags
ObjectId srcObjectId = src.getPeeledObjectId();
if (srcObjectId == null)
srcObjectId = src.getObjectId();
RevCommit srcCommit = revWalk.parseCommit(srcObjectId);
// get the parent of the commit to revert
if (srcCommit.getParentCount() != 1)
throw new MultipleParentsNotAllowedException(
MessageFormat.format(
JGitText.get().canOnlyRevertCommitsWithOneParent,
srcCommit.name(),
Integer.valueOf(srcCommit.getParentCount())));
RevCommit srcParent = srcCommit.getParent(0);
revWalk.parseHeaders(srcParent);
String ourName = calculateOurName(headRef);
String revertName = srcCommit.getId().abbreviate(7).name()
+ " " + srcCommit.getShortMessage(); //$NON-NLS-1$
ResolveMerger merger = (ResolveMerger) strategy.newMerger(repo);
merger.setWorkingTreeIterator(new FileTreeIterator(repo));
merger.setBase(srcCommit.getTree());
merger.setCommitNames(new String[] {
"BASE", ourName, revertName }); //$NON-NLS-1$
String shortMessage = "Revert \"" + srcCommit.getShortMessage() //$NON-NLS-1$
+ "\""; //$NON-NLS-1$
String newMessage = shortMessage + "\n\n" //$NON-NLS-1$
+ "This reverts commit " + srcCommit.getId().getName() //$NON-NLS-1$
+ ".\n"; //$NON-NLS-1$
if (merger.merge(headCommit, srcParent)) {
if (AnyObjectId.equals(headCommit.getTree().getId(), merger
.getResultTreeId()))
continue;
DirCacheCheckout dco = new DirCacheCheckout(repo,
headCommit.getTree(), repo.lockDirCache(),
merger.getResultTreeId());
dco.setFailOnConflict(true);
dco.checkout();
newHead = new Git(getRepository()).commit()
.setMessage(newMessage)
.setReflogComment("revert: " + shortMessage).call(); //$NON-NLS-1$
revertedRefs.add(src);
headCommit = newHead;
} else {
unmergedPaths = merger.getUnmergedPaths();
Map<String, MergeFailureReason> failingPaths = merger
.getFailingPaths();
if (failingPaths != null)
failingResult = new MergeResult(null,
merger.getBaseCommitId(),
new ObjectId[] { headCommit.getId(),
srcParent.getId() },
MergeStatus.FAILED, strategy,
merger.getMergeResults(), failingPaths, null);
else
failingResult = new MergeResult(null,
merger.getBaseCommitId(),
new ObjectId[] { headCommit.getId(),
srcParent.getId() },
MergeStatus.CONFLICTING, strategy,
merger.getMergeResults(), failingPaths, null);
if (!merger.failed() && !unmergedPaths.isEmpty()) {
String message = new MergeMessageFormatter()
.formatWithConflicts(newMessage,
merger.getUnmergedPaths());
repo.writeRevertHead(srcCommit.getId());
repo.writeMergeCommitMsg(message);
}
return null;
}
}
} catch (IOException e) {
throw new JGitInternalException(
MessageFormat.format(
JGitText.get().exceptionCaughtDuringExecutionOfRevertCommand,
e), e);
} finally {
revWalk.release();
}
return newHead;
}
/**
* @param commit
* a reference to a commit which is reverted into the current
* head
* @return {@code this}
*/
public RevertCommand include(Ref commit) {
checkCallable();
commits.add(commit);
return this;
}
/**
* @param commit
* the Id of a commit which is reverted into the current head
* @return {@code this}
*/
public RevertCommand include(AnyObjectId commit) {
return include(commit.getName(), commit);
}
/**
* @param name
* a name given to the commit
* @param commit
* the Id of a commit which is reverted into the current head
* @return {@code this}
*/
public RevertCommand include(String name, AnyObjectId commit) {
return include(new ObjectIdRef.Unpeeled(Storage.LOOSE, name,
commit.copy()));
}
/**
* @param ourCommitName
* the name that should be used in the "OURS" place for conflict
* markers
* @return {@code this}
*/
public RevertCommand setOurCommitName(String ourCommitName) {
this.ourCommitName = ourCommitName;
return this;
}
private String calculateOurName(Ref headRef) {
if (ourCommitName != null)
return ourCommitName;
String targetRefName = headRef.getTarget().getName();
String headName = Repository.shortenRefName(targetRefName);
return headName;
}
/**
* @return the list of successfully reverted {@link Ref}'s. Never
* <code>null</code> but maybe an empty list if no commit was
* successfully cherry-picked
*/
public List<Ref> getRevertedRefs() {
return revertedRefs;
}
/**
* @return the result of the merge failure, <code>null</code> if no merge
* failure occurred during the revert
*/
public MergeResult getFailingResult() {
return failingResult;
}
/**
* @return the unmerged paths, will be null if no merge conflicts
*/
public List<String> getUnmergedPaths() {
return unmergedPaths;
}
/**
* @param strategy
* The merge strategy to use during this revert command.
* @return {@code this}
* @since 3.4
*/
public RevertCommand setStrategy(MergeStrategy strategy) {
this.strategy = strategy;
return this;
}
}