/*
* Copyright (C) 2009-2010, Google Inc.
* Copyright (C) 2009, Robin Rosenberg <robin.rosenberg@dewire.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
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package org.eclipse.jgit.internal.storage.file;
import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertNotSame;
import static org.junit.Assert.fail;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import org.eclipse.jgit.errors.IncorrectObjectTypeException;
import org.eclipse.jgit.errors.MissingObjectException;
import org.eclipse.jgit.internal.storage.pack.PackWriter;
import org.eclipse.jgit.junit.RepositoryTestCase;
import org.eclipse.jgit.lib.AnyObjectId;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.NullProgressMonitor;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.ObjectInserter;
import org.eclipse.jgit.lib.ObjectLoader;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.RevObject;
import org.eclipse.jgit.revwalk.RevWalk;
import org.eclipse.jgit.storage.file.WindowCacheConfig;
import org.eclipse.jgit.util.FileUtils;
import org.eclipse.jgit.util.io.SafeBufferedOutputStream;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
public class ConcurrentRepackTest extends RepositoryTestCase {
@Before
public void setUp() throws Exception {
WindowCacheConfig windowCacheConfig = new WindowCacheConfig();
windowCacheConfig.setPackedGitOpenFiles(1);
WindowCache.reconfigure(windowCacheConfig);
super.setUp();
}
@After
public void tearDown() throws Exception {
super.tearDown();
WindowCacheConfig windowCacheConfig = new WindowCacheConfig();
WindowCache.reconfigure(windowCacheConfig);
}
@Test
public void testObjectInNewPack() throws IncorrectObjectTypeException,
IOException {
// Create a new object in a new pack, and test that it is present.
//
final Repository eden = createBareRepository();
final RevObject o1 = writeBlob(eden, "o1");
pack(eden, o1);
assertEquals(o1.name(), parse(o1).name());
}
@Test
public void testObjectMovedToNewPack1()
throws IncorrectObjectTypeException, IOException {
// Create an object and pack it. Then remove that pack and put the
// object into a different pack file, with some other object. We
// still should be able to access the objects.
//
final Repository eden = createBareRepository();
final RevObject o1 = writeBlob(eden, "o1");
final File[] out1 = pack(eden, o1);
assertEquals(o1.name(), parse(o1).name());
final RevObject o2 = writeBlob(eden, "o2");
pack(eden, o2, o1);
// Force close, and then delete, the old pack.
//
whackCache();
delete(out1);
// Now here is the interesting thing. Will git figure the new
// object exists in the new pack, and not the old one.
//
assertEquals(o2.name(), parse(o2).name());
assertEquals(o1.name(), parse(o1).name());
}
@Test
public void testObjectMovedWithinPack()
throws IncorrectObjectTypeException, IOException {
// Create an object and pack it.
//
final Repository eden = createBareRepository();
final RevObject o1 = writeBlob(eden, "o1");
final File[] out1 = pack(eden, o1);
assertEquals(o1.name(), parse(o1).name());
// Force close the old pack.
//
whackCache();
// Now overwrite the old pack in place. This method of creating a
// different pack under the same file name is partially broken. We
// should also have a different file name because the list of objects
// within the pack has been modified.
//
final RevObject o2 = writeBlob(eden, "o2");
final PackWriter pw = new PackWriter(eden);
pw.addObject(o2);
pw.addObject(o1);
write(out1, pw);
pw.release();
// Try the old name, then the new name. The old name should cause the
// pack to reload when it opens and the index and pack mismatch.
//
assertEquals(o1.name(), parse(o1).name());
assertEquals(o2.name(), parse(o2).name());
}
@Test
public void testObjectMovedToNewPack2()
throws IncorrectObjectTypeException, IOException {
// Create an object and pack it. Then remove that pack and put the
// object into a different pack file, with some other object. We
// still should be able to access the objects.
//
final Repository eden = createBareRepository();
final RevObject o1 = writeBlob(eden, "o1");
final File[] out1 = pack(eden, o1);
assertEquals(o1.name(), parse(o1).name());
final ObjectLoader load1 = db.open(o1, Constants.OBJ_BLOB);
assertNotNull(load1);
final RevObject o2 = writeBlob(eden, "o2");
pack(eden, o2, o1);
// Force close, and then delete, the old pack.
//
whackCache();
delete(out1);
// Now here is the interesting thing... can the loader we made
// earlier still resolve the object, even though its underlying
// pack is gone, but the object still exists.
//
final ObjectLoader load2 = db.open(o1, Constants.OBJ_BLOB);
assertNotNull(load2);
assertNotSame(load1, load2);
final byte[] data2 = load2.getCachedBytes();
final byte[] data1 = load1.getCachedBytes();
assertNotNull(data2);
assertNotNull(data1);
assertNotSame(data1, data2); // cache should be per-pack, not per object
assertArrayEquals(data1, data2);
assertEquals(load2.getType(), load1.getType());
}
private static void whackCache() {
final WindowCacheConfig config = new WindowCacheConfig();
config.setPackedGitOpenFiles(1);
WindowCache.reconfigure(config);
}
private RevObject parse(final AnyObjectId id)
throws MissingObjectException, IOException {
return new RevWalk(db).parseAny(id);
}
private File[] pack(final Repository src, final RevObject... list)
throws IOException {
final PackWriter pw = new PackWriter(src);
for (final RevObject o : list) {
pw.addObject(o);
}
final ObjectId name = pw.computeName();
final File packFile = fullPackFileName(name, ".pack");
final File idxFile = fullPackFileName(name, ".idx");
final File[] files = new File[] { packFile, idxFile };
write(files, pw);
pw.release();
return files;
}
private static void write(final File[] files, final PackWriter pw)
throws IOException {
final long begin = files[0].getParentFile().lastModified();
NullProgressMonitor m = NullProgressMonitor.INSTANCE;
OutputStream out;
out = new SafeBufferedOutputStream(new FileOutputStream(files[0]));
try {
pw.writePack(m, m, out);
} finally {
out.close();
}
out = new SafeBufferedOutputStream(new FileOutputStream(files[1]));
try {
pw.writeIndex(out);
} finally {
out.close();
}
touch(begin, files[0].getParentFile());
}
private static void delete(final File[] list) throws IOException {
final long begin = list[0].getParentFile().lastModified();
for (final File f : list) {
FileUtils.delete(f);
assertFalse(f + " was removed", f.exists());
}
touch(begin, list[0].getParentFile());
}
private static void touch(final long begin, final File dir) {
while (begin >= dir.lastModified()) {
try {
Thread.sleep(25);
} catch (InterruptedException ie) {
//
}
dir.setLastModified(System.currentTimeMillis());
}
}
private File fullPackFileName(final ObjectId name, final String suffix) {
final File packdir = new File(db.getObjectDatabase().getDirectory(), "pack");
return new File(packdir, "pack-" + name.name() + suffix);
}
private RevObject writeBlob(final Repository repo, final String data)
throws IOException {
final RevWalk revWalk = new RevWalk(repo);
final byte[] bytes = Constants.encode(data);
final ObjectInserter inserter = repo.newObjectInserter();
final ObjectId id;
try {
id = inserter.insert(Constants.OBJ_BLOB, bytes);
inserter.flush();
} finally {
inserter.release();
}
try {
parse(id);
fail("Object " + id.name() + " should not exist in test repository");
} catch (MissingObjectException e) {
// Ok
}
return revWalk.lookupBlob(id);
}
}