/*
* Copyright (C) 2016, 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.
*/
package org.eclipse.jgit.internal.storage.reftree;
import static org.eclipse.jgit.lib.Constants.OBJ_TREE;
import static org.eclipse.jgit.transport.ReceiveCommand.Result.NOT_ATTEMPTED;
import static org.eclipse.jgit.transport.ReceiveCommand.Result.OK;
import static org.eclipse.jgit.transport.ReceiveCommand.Result.REJECTED_NONFASTFORWARD;
import static org.eclipse.jgit.transport.ReceiveCommand.Result.REJECTED_OTHER_REASON;
import static org.eclipse.jgit.transport.ReceiveCommand.Type.UPDATE;
import static org.eclipse.jgit.transport.ReceiveCommand.Type.UPDATE_NONFASTFORWARD;
import java.io.IOException;
import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.jgit.annotations.Nullable;
import org.eclipse.jgit.internal.JGitText;
import org.eclipse.jgit.lib.BatchRefUpdate;
import org.eclipse.jgit.lib.CommitBuilder;
import org.eclipse.jgit.lib.NullProgressMonitor;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.ObjectInserter;
import org.eclipse.jgit.lib.ObjectReader;
import org.eclipse.jgit.lib.PersonIdent;
import org.eclipse.jgit.lib.ProgressMonitor;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevWalk;
import org.eclipse.jgit.transport.ReceiveCommand;
/** Batch update a {@link RefTreeDatabase}. */
class RefTreeBatch extends BatchRefUpdate {
private final RefTreeDatabase refdb;
private Ref src;
private ObjectId parentCommitId;
private ObjectId parentTreeId;
private RefTree tree;
private PersonIdent author;
private ObjectId newCommitId;
RefTreeBatch(RefTreeDatabase refdb) {
super(refdb);
this.refdb = refdb;
}
@Override
public void execute(RevWalk rw, ProgressMonitor monitor)
throws IOException {
List<Command> todo = new ArrayList<>(getCommands().size());
for (ReceiveCommand c : getCommands()) {
if (!isAllowNonFastForwards()) {
if (c.getType() == UPDATE) {
c.updateType(rw);
}
if (c.getType() == UPDATE_NONFASTFORWARD) {
c.setResult(REJECTED_NONFASTFORWARD);
if (isAtomic()) {
ReceiveCommand.abort(getCommands());
return;
} else {
continue;
}
}
}
todo.add(new Command(rw, c));
}
init(rw);
execute(rw, todo);
}
void init(RevWalk rw) throws IOException {
src = refdb.getBootstrap().exactRef(refdb.getTxnCommitted());
if (src != null && src.getObjectId() != null) {
RevCommit c = rw.parseCommit(src.getObjectId());
parentCommitId = c;
parentTreeId = c.getTree();
tree = RefTree.read(rw.getObjectReader(), c.getTree());
} else {
parentCommitId = ObjectId.zeroId();
parentTreeId = new ObjectInserter.Formatter()
.idFor(OBJ_TREE, new byte[] {});
tree = RefTree.newEmptyTree();
}
}
@Nullable
Ref exactRef(ObjectReader reader, String name) throws IOException {
return tree.exactRef(reader, name);
}
/**
* Execute an update from {@link RefTreeUpdate} or {@link RefTreeRename}.
*
* @param rw
* current RevWalk handling the update or rename.
* @param todo
* commands to execute. Must never be a bootstrap reference name.
* @throws IOException
* the storage system is unable to read or write data.
*/
void execute(RevWalk rw, List<Command> todo) throws IOException {
for (Command c : todo) {
if (c.getResult() != NOT_ATTEMPTED) {
Command.abort(todo, null);
return;
}
if (refdb.conflictsWithBootstrap(c.getRefName())) {
c.setResult(REJECTED_OTHER_REASON, MessageFormat
.format(JGitText.get().invalidRefName, c.getRefName()));
Command.abort(todo, null);
return;
}
}
if (apply(todo) && newCommitId != null) {
commit(rw, todo);
}
}
private boolean apply(List<Command> todo) throws IOException {
if (!tree.apply(todo)) {
// apply set rejection information on commands.
return false;
}
Repository repo = refdb.getRepository();
try (ObjectInserter ins = repo.newObjectInserter()) {
CommitBuilder b = new CommitBuilder();
b.setTreeId(tree.writeTree(ins));
if (parentTreeId.equals(b.getTreeId())) {
for (Command c : todo) {
c.setResult(OK);
}
return true;
}
if (!parentCommitId.equals(ObjectId.zeroId())) {
b.setParentId(parentCommitId);
}
author = getRefLogIdent();
if (author == null) {
author = new PersonIdent(repo);
}
b.setAuthor(author);
b.setCommitter(author);
b.setMessage(getRefLogMessage());
newCommitId = ins.insert(b);
ins.flush();
}
return true;
}
private void commit(RevWalk rw, List<Command> todo) throws IOException {
ReceiveCommand commit = new ReceiveCommand(
parentCommitId, newCommitId,
refdb.getTxnCommitted());
updateBootstrap(rw, commit);
if (commit.getResult() == OK) {
for (Command c : todo) {
c.setResult(OK);
}
} else {
Command.abort(todo, commit.getResult().name());
}
}
private void updateBootstrap(RevWalk rw, ReceiveCommand commit)
throws IOException {
BatchRefUpdate u = refdb.getBootstrap().newBatchUpdate();
u.setAllowNonFastForwards(true);
u.setPushCertificate(getPushCertificate());
if (isRefLogDisabled()) {
u.disableRefLog();
} else {
u.setRefLogIdent(author);
u.setRefLogMessage(getRefLogMessage(), false);
}
u.addCommand(commit);
u.execute(rw, NullProgressMonitor.INSTANCE);
}
}