/*
* Copyright (C) 2008, Marek Zawirski <marek.zawirski@gmail.com>
* Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org>
*
* 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 Git Development Community 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.spearce.jgit.transport;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Map;
import org.spearce.jgit.errors.NoRemoteRepositoryException;
import org.spearce.jgit.errors.NotSupportedException;
import org.spearce.jgit.errors.PackProtocolException;
import org.spearce.jgit.errors.TransportException;
import org.spearce.jgit.lib.ObjectId;
import org.spearce.jgit.lib.PackWriter;
import org.spearce.jgit.lib.ProgressMonitor;
import org.spearce.jgit.lib.Ref;
import org.spearce.jgit.transport.RemoteRefUpdate.Status;
/**
* Push implementation using the native Git pack transfer service.
* <p>
* This is the canonical implementation for transferring objects to the remote
* repository from the local repository by talking to the 'git-receive-pack'
* service. Objects are packed on the local side into a pack file and then sent
* to the remote repository.
* <p>
* This connection requires only a bi-directional pipe or socket, and thus is
* easily wrapped up into a local process pipe, anonymous TCP socket, or a
* command executed through an SSH tunnel.
* <p>
* This implementation honors {@link Transport#isPushThin()} option.
* <p>
* Concrete implementations should just call
* {@link #init(java.io.InputStream, java.io.OutputStream)} and
* {@link #readAdvertisedRefs()} methods in constructor or before any use. They
* should also handle resources releasing in {@link #close()} method if needed.
*/
class BasePackPushConnection extends BasePackConnection implements
PushConnection {
static final String CAPABILITY_REPORT_STATUS = "report-status";
static final String CAPABILITY_DELETE_REFS = "delete-refs";
static final String CAPABILITY_OFS_DELTA = "ofs-delta";
private final boolean thinPack;
private boolean capableDeleteRefs;
private boolean capableReport;
private boolean capableOfsDelta;
private boolean sentCommand;
private boolean writePack;
/** Time in milliseconds spent transferring the pack data. */
private long packTransferTime;
BasePackPushConnection(final PackTransport packTransport) {
super(packTransport);
thinPack = transport.isPushThin();
}
public void push(final ProgressMonitor monitor,
final Map<String, RemoteRefUpdate> refUpdates)
throws TransportException {
markStartedOperation();
doPush(monitor, refUpdates);
}
@Override
protected TransportException noRepository() {
// Sadly we cannot tell the "invalid URI" case from "push not allowed".
// Opening a fetch connection can help us tell the difference, as any
// useful repository is going to support fetch if it also would allow
// push. So if fetch throws NoRemoteRepositoryException we know the
// URI is wrong. Otherwise we can correctly state push isn't allowed
// as the fetch connection opened successfully.
//
try {
transport.openFetch().close();
} catch (NotSupportedException e) {
// Fall through.
} catch (NoRemoteRepositoryException e) {
// Fetch concluded the repository doesn't exist.
//
return e;
} catch (TransportException e) {
// Fall through.
}
return new TransportException(uri, "push not permitted");
}
protected void doPush(final ProgressMonitor monitor,
final Map<String, RemoteRefUpdate> refUpdates)
throws TransportException {
try {
writeCommands(refUpdates.values(), monitor);
if (writePack)
writePack(refUpdates, monitor);
if (sentCommand && capableReport)
readStatusReport(refUpdates);
} catch (TransportException e) {
throw e;
} catch (Exception e) {
throw new TransportException(uri, e.getMessage(), e);
} finally {
close();
}
}
private void writeCommands(final Collection<RemoteRefUpdate> refUpdates,
final ProgressMonitor monitor) throws IOException {
final String capabilities = enableCapabilities();
for (final RemoteRefUpdate rru : refUpdates) {
if (!capableDeleteRefs && rru.isDelete()) {
rru.setStatus(Status.REJECTED_NODELETE);
continue;
}
final StringBuilder sb = new StringBuilder();
final Ref advertisedRef = getRef(rru.getRemoteName());
final ObjectId oldId = (advertisedRef == null ? ObjectId.zeroId()
: advertisedRef.getObjectId());
sb.append(oldId.name());
sb.append(' ');
sb.append(rru.getNewObjectId().name());
sb.append(' ');
sb.append(rru.getRemoteName());
if (!sentCommand) {
sentCommand = true;
sb.append(capabilities);
}
pckOut.writeString(sb.toString());
rru.setStatus(sentCommand ? Status.AWAITING_REPORT : Status.OK);
if (!rru.isDelete())
writePack = true;
}
if (monitor.isCancelled())
throw new TransportException(uri, "push cancelled");
pckOut.end();
outNeedsEnd = false;
}
private String enableCapabilities() {
final StringBuilder line = new StringBuilder();
capableReport = wantCapability(line, CAPABILITY_REPORT_STATUS);
capableDeleteRefs = wantCapability(line, CAPABILITY_DELETE_REFS);
capableOfsDelta = wantCapability(line, CAPABILITY_OFS_DELTA);
if (line.length() > 0)
line.setCharAt(0, '\0');
return line.toString();
}
private void writePack(final Map<String, RemoteRefUpdate> refUpdates,
final ProgressMonitor monitor) throws IOException {
final PackWriter writer = new PackWriter(local, monitor);
final ArrayList<ObjectId> remoteObjects = new ArrayList<ObjectId>(
getRefs().size());
final ArrayList<ObjectId> newObjects = new ArrayList<ObjectId>(
refUpdates.size());
for (final Ref r : getRefs())
remoteObjects.add(r.getObjectId());
remoteObjects.addAll(additionalHaves);
for (final RemoteRefUpdate r : refUpdates.values()) {
if (!ObjectId.zeroId().equals(r.getNewObjectId()))
newObjects.add(r.getNewObjectId());
}
writer.setThin(thinPack);
writer.setDeltaBaseAsOffset(capableOfsDelta);
writer.preparePack(newObjects, remoteObjects);
final long start = System.currentTimeMillis();
writer.writePack(out);
packTransferTime = System.currentTimeMillis() - start;
}
private void readStatusReport(final Map<String, RemoteRefUpdate> refUpdates)
throws IOException {
final String unpackLine = readStringLongTimeout();
if (!unpackLine.startsWith("unpack "))
throw new PackProtocolException(uri, "unexpected report line: "
+ unpackLine);
final String unpackStatus = unpackLine.substring("unpack ".length());
if (!unpackStatus.equals("ok"))
throw new TransportException(uri,
"error occurred during unpacking on the remote end: "
+ unpackStatus);
String refLine;
while ((refLine = pckIn.readString()) != PacketLineIn.END) {
boolean ok = false;
int refNameEnd = -1;
if (refLine.startsWith("ok ")) {
ok = true;
refNameEnd = refLine.length();
} else if (refLine.startsWith("ng ")) {
ok = false;
refNameEnd = refLine.indexOf(" ", 3);
}
if (refNameEnd == -1)
throw new PackProtocolException(uri
+ ": unexpected report line: " + refLine);
final String refName = refLine.substring(3, refNameEnd);
final String message = (ok ? null : refLine
.substring(refNameEnd + 1));
final RemoteRefUpdate rru = refUpdates.get(refName);
if (rru == null)
throw new PackProtocolException(uri
+ ": unexpected ref report: " + refName);
if (ok) {
rru.setStatus(Status.OK);
} else {
rru.setStatus(Status.REJECTED_OTHER_REASON);
rru.setMessage(message);
}
}
for (final RemoteRefUpdate rru : refUpdates.values()) {
if (rru.getStatus() == Status.AWAITING_REPORT)
throw new PackProtocolException(uri
+ ": expected report for ref " + rru.getRemoteName()
+ " not received");
}
}
private String readStringLongTimeout() throws IOException {
if (timeoutIn == null)
return pckIn.readString();
// The remote side may need a lot of time to choke down the pack
// we just sent them. There may be many deltas that need to be
// resolved by the remote. Its hard to say how long the other
// end is going to be silent. Taking 10x the configured timeout
// or the time spent transferring the pack, whichever is larger,
// gives the other side some reasonable window to process the data,
// but this is just a wild guess.
//
final int oldTimeout = timeoutIn.getTimeout();
final int sendTime = (int) Math.min(packTransferTime, 28800000L);
try {
timeoutIn.setTimeout(10 * Math.max(sendTime, oldTimeout));
return pckIn.readString();
} finally {
timeoutIn.setTimeout(oldTimeout);
}
}
}