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If an application uses PushConnection directly on the native Git wire protocols JGit should send along the application's expected oldId, not the advertised value. This allows the remote peer to compare-and-swap since it was not tested inside JGit. Discovered when I tried to use a PushConnection (bypassing the standard PushProcess) and the client blindly overwrote the remote reference, even though my app had supplied the wrong ObjectId for the expectedOldObjectId. This was not expected and cost me over an hour of debugging, plus "corruption" in the remote repository. By passing along the exact expectedOldObjectId from the app the remote side can do the check that the application skipped, and avoid data loss. Change-Id: Id3920837e6c47100376225bb4dd61fa3e88c64dbstable-4.3
Shawn Pearce
9 years ago
4 changed files with 156 additions and 4 deletions
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/* |
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* Copyright (C) 2015, Google Inc. |
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* and other copyright owners as documented in the project's IP log. |
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* |
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* This program and the accompanying materials are made available |
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* under the terms of the Eclipse Distribution License v1.0 which |
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* accompanies this distribution, is reproduced below, and is |
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* available at http://www.eclipse.org/org/documents/edl-v10.php
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* |
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* All rights reserved. |
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* Redistribution and use in source and binary forms, with or |
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* without modification, are permitted provided that the following |
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* conditions are met: |
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* |
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* - Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* |
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* - Redistributions in binary form must reproduce the above |
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* with the distribution. |
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* - Neither the name of the Eclipse Foundation, Inc. nor the |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND |
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*/ |
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package org.eclipse.jgit.transport; |
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import static org.eclipse.jgit.transport.RemoteRefUpdate.Status.REJECTED_OTHER_REASON; |
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import static org.junit.Assert.assertEquals; |
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import java.io.IOException; |
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import java.util.HashMap; |
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import java.util.Map; |
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import org.eclipse.jgit.internal.storage.dfs.DfsRepositoryDescription; |
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import org.eclipse.jgit.internal.storage.dfs.InMemoryRepository; |
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import org.eclipse.jgit.lib.Constants; |
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import org.eclipse.jgit.lib.NullProgressMonitor; |
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import org.eclipse.jgit.lib.ObjectId; |
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import org.eclipse.jgit.lib.ObjectInserter; |
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import org.eclipse.jgit.lib.RefUpdate; |
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import org.eclipse.jgit.lib.Repository; |
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import org.eclipse.jgit.transport.resolver.ReceivePackFactory; |
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import org.eclipse.jgit.transport.resolver.ServiceNotAuthorizedException; |
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import org.eclipse.jgit.transport.resolver.ServiceNotEnabledException; |
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import org.junit.After; |
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import org.junit.Before; |
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import org.junit.Test; |
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public class PushConnectionTest { |
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private URIish uri; |
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private TestProtocol<Object> testProtocol; |
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private Object ctx = new Object(); |
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private InMemoryRepository server; |
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private InMemoryRepository client; |
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private ObjectId obj1; |
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private ObjectId obj2; |
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private ObjectId obj3; |
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private String refName = "refs/tags/blob"; |
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@Before |
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public void setUp() throws Exception { |
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server = newRepo("server"); |
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client = newRepo("client"); |
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testProtocol = new TestProtocol<>( |
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null, |
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new ReceivePackFactory<Object>() { |
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@Override |
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public ReceivePack create(Object req, Repository db) |
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throws ServiceNotEnabledException, |
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ServiceNotAuthorizedException { |
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return new ReceivePack(db); |
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} |
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}); |
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uri = testProtocol.register(ctx, server); |
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try (ObjectInserter ins = server.newObjectInserter()) { |
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obj1 = ins.insert(Constants.OBJ_BLOB, Constants.encode("test")); |
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obj3 = ins.insert(Constants.OBJ_BLOB, Constants.encode("not")); |
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ins.flush(); |
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RefUpdate u = server.updateRef(refName); |
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u.setNewObjectId(obj1); |
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assertEquals(RefUpdate.Result.NEW, u.update()); |
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} |
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try (ObjectInserter ins = client.newObjectInserter()) { |
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obj2 = ins.insert(Constants.OBJ_BLOB, Constants.encode("file")); |
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ins.flush(); |
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} |
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} |
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@After |
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public void tearDown() { |
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Transport.unregister(testProtocol); |
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} |
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private static InMemoryRepository newRepo(String name) { |
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return new InMemoryRepository(new DfsRepositoryDescription(name)); |
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} |
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@Test |
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public void testWrongOldIdDoesNotReplace() throws IOException { |
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RemoteRefUpdate rru = new RemoteRefUpdate(null, null, obj2, refName, |
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false, null, obj3); |
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Map<String, RemoteRefUpdate> updates = new HashMap<>(); |
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updates.put(rru.getRemoteName(), rru); |
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Transport tn = testProtocol.open(uri, client, "server"); |
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try { |
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PushConnection connection = tn.openPush(); |
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try { |
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connection.push(NullProgressMonitor.INSTANCE, updates); |
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} finally { |
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connection.close(); |
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} |
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} finally { |
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tn.close(); |
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} |
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assertEquals(REJECTED_OTHER_REASON, rru.getStatus()); |
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assertEquals("invalid old id sent", rru.getMessage()); |
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} |
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} |
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