/*
* Copyright (C) 2008, Marek Zawirski <marek.zawirski@gmail.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.transport;
import java.io.IOException;
import java.text.MessageFormat;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import org.eclipse.jgit.JGitText;
import org.eclipse.jgit.errors.MissingObjectException;
import org.eclipse.jgit.errors.NotSupportedException;
import org.eclipse.jgit.errors.TransportException;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.ProgressMonitor;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevObject;
import org.eclipse.jgit.revwalk.RevWalk;
import org.eclipse.jgit.transport.RemoteRefUpdate.Status;
/**
* Class performing push operation on remote repository.
*
* @see Transport#push(ProgressMonitor, Collection)
*/
class PushProcess {
/** Task name for {@link ProgressMonitor} used during opening connection. */
static final String PROGRESS_OPENING_CONNECTION = JGitText.get().openingConnection;
/** Transport used to perform this operation. */
private final Transport transport;
/** Push operation connection created to perform this operation */
private PushConnection connection;
/** Refs to update on remote side. */
private final Map<String, RemoteRefUpdate> toPush;
/** Revision walker for checking some updates properties. */
private final RevWalk walker;
/**
* Create process for specified transport and refs updates specification.
*
* @param transport
* transport between remote and local repository, used to create
* connection.
* @param toPush
* specification of refs updates (and local tracking branches).
* @throws TransportException
*/
PushProcess(final Transport transport,
final Collection<RemoteRefUpdate> toPush) throws TransportException {
this.walker = new RevWalk(transport.local);
this.transport = transport;
this.toPush = new HashMap<String, RemoteRefUpdate>();
for (final RemoteRefUpdate rru : toPush) {
if (this.toPush.put(rru.getRemoteName(), rru) != null)
throw new TransportException(MessageFormat.format(
JGitText.get().duplicateRemoteRefUpdateIsIllegal, rru.getRemoteName()));
}
}
/**
* Perform push operation between local and remote repository - set remote
* refs appropriately, send needed objects and update local tracking refs.
* <p>
* When {@link Transport#isDryRun()} is true, result of this operation is
* just estimation of real operation result, no real action is performed.
*
* @param monitor
* progress monitor used for feedback about operation.
* @return result of push operation with complete status description.
* @throws NotSupportedException
* when push operation is not supported by provided transport.
* @throws TransportException
* when some error occurred during operation, like I/O, protocol
* error, or local database consistency error.
*/
PushResult execute(final ProgressMonitor monitor)
throws NotSupportedException, TransportException {
try {
monitor.beginTask(PROGRESS_OPENING_CONNECTION,
ProgressMonitor.UNKNOWN);
final PushResult res = new PushResult();
connection = transport.openPush();
try {
res.setAdvertisedRefs(transport.getURI(), connection
.getRefsMap());
res.setRemoteUpdates(toPush);
monitor.endTask();
final Map<String, RemoteRefUpdate> preprocessed = prepareRemoteUpdates();
if (transport.isDryRun())
modifyUpdatesForDryRun();
else if (!preprocessed.isEmpty())
connection.push(monitor, preprocessed);
} finally {
connection.close();
res.addMessages(connection.getMessages());
}
if (!transport.isDryRun())
updateTrackingRefs();
for (final RemoteRefUpdate rru : toPush.values()) {
final TrackingRefUpdate tru = rru.getTrackingRefUpdate();
if (tru != null)
res.add(tru);
}
return res;
} finally {
walker.release();
}
}
private Map<String, RemoteRefUpdate> prepareRemoteUpdates()
throws TransportException {
final Map<String, RemoteRefUpdate> result = new HashMap<String, RemoteRefUpdate>();
for (final RemoteRefUpdate rru : toPush.values()) {
final Ref advertisedRef = connection.getRef(rru.getRemoteName());
final ObjectId advertisedOld = (advertisedRef == null ? ObjectId
.zeroId() : advertisedRef.getObjectId());
if (rru.getNewObjectId().equals(advertisedOld)) {
if (rru.isDelete()) {
// ref does exist neither locally nor remotely
rru.setStatus(Status.NON_EXISTING);
} else {
// same object - nothing to do
rru.setStatus(Status.UP_TO_DATE);
}
continue;
}
// caller has explicitly specified expected old object id, while it
// has been changed in the mean time - reject
if (rru.isExpectingOldObjectId()
&& !rru.getExpectedOldObjectId().equals(advertisedOld)) {
rru.setStatus(Status.REJECTED_REMOTE_CHANGED);
continue;
}
// create ref (hasn't existed on remote side) and delete ref
// are always fast-forward commands, feasible at this level
if (advertisedOld.equals(ObjectId.zeroId()) || rru.isDelete()) {
rru.setFastForward(true);
result.put(rru.getRemoteName(), rru);
continue;
}
// check for fast-forward:
// - both old and new ref must point to commits, AND
// - both of them must be known for us, exist in repository, AND
// - old commit must be ancestor of new commit
boolean fastForward = true;
try {
RevObject oldRev = walker.parseAny(advertisedOld);
final RevObject newRev = walker.parseAny(rru.getNewObjectId());
if (!(oldRev instanceof RevCommit)
|| !(newRev instanceof RevCommit)
|| !walker.isMergedInto((RevCommit) oldRev,
(RevCommit) newRev))
fastForward = false;
} catch (MissingObjectException x) {
fastForward = false;
} catch (Exception x) {
throw new TransportException(transport.getURI(), MessageFormat.format(
JGitText.get().readingObjectsFromLocalRepositoryFailed, x.getMessage()), x);
}
rru.setFastForward(fastForward);
if (!fastForward && !rru.isForceUpdate())
rru.setStatus(Status.REJECTED_NONFASTFORWARD);
else
result.put(rru.getRemoteName(), rru);
}
return result;
}
private void modifyUpdatesForDryRun() {
for (final RemoteRefUpdate rru : toPush.values())
if (rru.getStatus() == Status.NOT_ATTEMPTED)
rru.setStatus(Status.OK);
}
private void updateTrackingRefs() {
for (final RemoteRefUpdate rru : toPush.values()) {
final Status status = rru.getStatus();
if (rru.hasTrackingRefUpdate()
&& (status == Status.UP_TO_DATE || status == Status.OK)) {
// update local tracking branch only when there is a chance that
// it has changed; this is possible for:
// -updated (OK) status,
// -up to date (UP_TO_DATE) status
try {
rru.updateTrackingRef(walker);
} catch (IOException e) {
// ignore as RefUpdate has stored I/O error status
}
}
}
}
}