/*
* Copyright (C) 2011, 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
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.eclipse.jgit.pgm;
import java.io.IOException;
import java.text.MessageFormat;
import java.util.Map;
import org.eclipse.jgit.api.Git;
import org.eclipse.jgit.api.MergeCommand;
import org.eclipse.jgit.api.MergeResult;
import org.eclipse.jgit.api.MergeCommand.FastForwardMode;
import org.eclipse.jgit.api.errors.CheckoutConflictException;
import org.eclipse.jgit.lib.AnyObjectId;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.merge.MergeStrategy;
import org.eclipse.jgit.merge.ResolveMerger.MergeFailureReason;
import org.eclipse.jgit.pgm.internal.CLIText;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevWalk;
import org.kohsuke.args4j.Argument;
import org.kohsuke.args4j.Option;
@Command(common = true, usage = "usage_MergesTwoDevelopmentHistories")
class Merge extends TextBuiltin {
@Option(name = "--strategy", aliases = { "-s" }, usage = "usage_mergeStrategy")
private String strategyName;
@Option(name = "--squash", usage = "usage_squash")
private boolean squash;
@Option(name = "--no-commit", usage = "usage_noCommit")
private boolean noCommit = false;
private MergeStrategy mergeStrategy = MergeStrategy.RECURSIVE;
@Argument(required = true)
private String ref;
@Option(name = "--ff")
private FastForwardMode ff = FastForwardMode.FF;
@Option(name = "--no-ff")
void noff(@SuppressWarnings("unused") final boolean ignored) {
ff = FastForwardMode.NO_FF;
}
@Option(name = "--ff-only")
void ffonly(@SuppressWarnings("unused") final boolean ignored) {
ff = FastForwardMode.FF_ONLY;
}
@Override
protected void run() throws Exception {
if (squash && ff == FastForwardMode.NO_FF)
throw die(CLIText.get().cannotCombineSquashWithNoff);
// determine the merge strategy
if (strategyName != null) {
mergeStrategy = MergeStrategy.get(strategyName);
if (mergeStrategy == null)
throw die(MessageFormat.format(
CLIText.get().unknownMergeStrategy, strategyName));
}
// determine the other revision we want to merge with HEAD
final Ref srcRef = db.getRef(ref);
final ObjectId src = db.resolve(ref + "^{commit}"); //$NON-NLS-1$
if (src == null)
throw die(MessageFormat.format(
CLIText.get().refDoesNotExistOrNoCommit, ref));
Ref oldHead = db.getRef(Constants.HEAD);
Git git = new Git(db);
MergeCommand mergeCmd = git.merge().setStrategy(mergeStrategy)
.setSquash(squash).setFastForward(ff).setCommit(!noCommit);
if (srcRef != null)
mergeCmd.include(srcRef);
else
mergeCmd.include(src);
MergeResult result;
try {
result = mergeCmd.call();
} catch (CheckoutConflictException e) {
result = new MergeResult(e.getConflictingPaths()); // CHECKOUT_CONFLICT
}
switch (result.getMergeStatus()) {
case ALREADY_UP_TO_DATE:
if (squash)
outw.print(CLIText.get().nothingToSquash);
outw.println(CLIText.get().alreadyUpToDate);
break;
case FAST_FORWARD:
ObjectId oldHeadId = oldHead.getObjectId();
outw.println(MessageFormat.format(CLIText.get().updating, oldHeadId
.abbreviate(7).name(), result.getNewHead().abbreviate(7)
.name()));
outw.println(result.getMergeStatus().toString());
break;
case CHECKOUT_CONFLICT:
outw.println(CLIText.get().mergeCheckoutConflict);
for (String collidingPath : result.getCheckoutConflicts())
outw.println("\t" + collidingPath); //$NON-NLS-1$
outw.println(CLIText.get().mergeCheckoutFailed);
break;
case CONFLICTING:
for (String collidingPath : result.getConflicts().keySet())
outw.println(MessageFormat.format(CLIText.get().mergeConflict,
collidingPath));
outw.println(CLIText.get().mergeFailed);
break;
case FAILED:
for (Map.Entry<String, MergeFailureReason> entry : result
.getFailingPaths().entrySet())
switch (entry.getValue()) {
case DIRTY_WORKTREE:
case DIRTY_INDEX:
outw.println(CLIText.get().dontOverwriteLocalChanges);
outw.println(" " + entry.getKey()); //$NON-NLS-1$
break;
case COULD_NOT_DELETE:
outw.println(CLIText.get().cannotDeleteFile);
outw.println(" " + entry.getKey()); //$NON-NLS-1$
break;
}
break;
case MERGED:
String name;
if (!isMergedInto(oldHead, src))
name = mergeStrategy.getName();
else
name = "recursive"; //$NON-NLS-1$
outw.println(MessageFormat.format(CLIText.get().mergeMadeBy, name));
break;
case MERGED_NOT_COMMITTED:
outw.println(CLIText.get().mergeWentWellStoppedBeforeCommitting);
break;
case MERGED_SQUASHED:
case FAST_FORWARD_SQUASHED:
case MERGED_SQUASHED_NOT_COMMITTED:
outw.println(CLIText.get().mergedSquashed);
outw.println(CLIText.get().mergeWentWellStoppedBeforeCommitting);
break;
case ABORTED:
throw die(CLIText.get().ffNotPossibleAborting);
case NOT_SUPPORTED:
outw.println(MessageFormat.format(
CLIText.get().unsupportedOperation, result.toString()));
}
}
private boolean isMergedInto(Ref oldHead, AnyObjectId src)
throws IOException {
RevWalk revWalk = new RevWalk(db);
ObjectId oldHeadObjectId = oldHead.getPeeledObjectId();
if (oldHeadObjectId == null)
oldHeadObjectId = oldHead.getObjectId();
RevCommit oldHeadCommit = revWalk.lookupCommit(oldHeadObjectId);
RevCommit srcCommit = revWalk.lookupCommit(src);
return revWalk.isMergedInto(oldHeadCommit, srcCommit);
}
}