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/*
* Copyright (C) 2010, Google Inc. and others
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0 which is available at
* https://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package org.eclipse.jgit.internal.storage.file;
import static org.eclipse.jgit.lib.Constants.OBJECT_ID_LENGTH;
import static org.eclipse.jgit.lib.Constants.OBJECT_ID_STRING_LENGTH;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import org.eclipse.jgit.errors.AmbiguousObjectException;
import org.eclipse.jgit.internal.storage.pack.PackExt;
import org.eclipse.jgit.internal.storage.pack.PackIndexWriter;
import org.eclipse.jgit.junit.LocalDiskRepositoryTestCase;
import org.eclipse.jgit.junit.TestRepository;
import org.eclipse.jgit.lib.AbbreviatedObjectId;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.ObjectReader;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.RevBlob;
import org.eclipse.jgit.transport.PackedObjectInfo;
import org.eclipse.jgit.util.FileUtils;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
public class AbbreviationTest extends LocalDiskRepositoryTestCase {
private FileRepository db;
private ObjectReader reader;
private TestRepository<Repository> test;
@Override
@Before
public void setUp() throws Exception {
super.setUp();
db = createBareRepository();
reader = db.newObjectReader();
test = new TestRepository<>(db);
}
@Override
@After
public void tearDown() throws Exception {
if (reader != null) {
reader.close();
}
}
@Test
public void testAbbreviateOnEmptyRepository() throws IOException {
ObjectId id = id("9d5b926ed164e8ee88d3b8b1e525d699adda01ba");
assertEquals(id.abbreviate(2), reader.abbreviate(id, 2));
assertEquals(id.abbreviate(7), reader.abbreviate(id, 7));
assertEquals(id.abbreviate(8), reader.abbreviate(id, 8));
assertEquals(id.abbreviate(10), reader.abbreviate(id, 10));
assertEquals(id.abbreviate(16), reader.abbreviate(id, 16));
assertEquals(AbbreviatedObjectId.fromObjectId(id), //
reader.abbreviate(id, OBJECT_ID_STRING_LENGTH));
Collection<ObjectId> matches;
matches = reader.resolve(reader.abbreviate(id, 8));
assertNotNull(matches);
assertEquals(0, matches.size());
matches = reader.resolve(AbbreviatedObjectId.fromObjectId(id));
assertNotNull(matches);
assertEquals(1, matches.size());
assertEquals(id, matches.iterator().next());
}
@Test
public void testAbbreviateLooseBlob() throws Exception {
ObjectId id = test.blob("test");
assertEquals(id.abbreviate(2), reader.abbreviate(id, 2));
assertEquals(id.abbreviate(7), reader.abbreviate(id, 7));
assertEquals(id.abbreviate(8), reader.abbreviate(id, 8));
assertEquals(id.abbreviate(10), reader.abbreviate(id, 10));
assertEquals(id.abbreviate(16), reader.abbreviate(id, 16));
Collection<ObjectId> matches = reader.resolve(reader.abbreviate(id, 8));
assertNotNull(matches);
assertEquals(1, matches.size());
assertEquals(id, matches.iterator().next());
assertEquals(id, db.resolve(reader.abbreviate(id, 8).name()));
}
@Test
public void testAbbreviatePackedBlob() throws Exception {
RevBlob id = test.blob("test");
test.branch("master").commit().add("test", id).child();
test.packAndPrune();
assertTrue(reader.has(id));
assertEquals(id.abbreviate(7), reader.abbreviate(id, 7));
assertEquals(id.abbreviate(8), reader.abbreviate(id, 8));
assertEquals(id.abbreviate(10), reader.abbreviate(id, 10));
assertEquals(id.abbreviate(16), reader.abbreviate(id, 16));
Collection<ObjectId> matches = reader.resolve(reader.abbreviate(id, 8));
assertNotNull(matches);
assertEquals(1, matches.size());
assertEquals(id, matches.iterator().next());
assertEquals(id, db.resolve(reader.abbreviate(id, 8).name()));
}
@Test
public void testAbbreviateIsActuallyUnique() throws Exception {
// This test is far more difficult. We have to manually craft
// an input that contains collisions at a particular prefix,
// but this is computationally difficult. Instead we force an
// index file to have what we want.
//
ObjectId id = id("9d5b926ed164e8ee88d3b8b1e525d699adda01ba");
byte[] idBuf = toByteArray(id);
List<PackedObjectInfo> objects = new ArrayList<>();
for (int i = 0; i < 256; i++) {
idBuf[9] = (byte) i;
objects.add(new PackedObjectInfo(ObjectId.fromRaw(idBuf)));
}
File packDir = db.getObjectDatabase().getPackDirectory();
PackFile idxFile = new PackFile(packDir, id, PackExt.INDEX);
PackFile packFile = idxFile.create(PackExt.PACK);
FileUtils.mkdir(packDir, true);
try (OutputStream dst = new BufferedOutputStream(
new FileOutputStream(idxFile))) {
PackIndexWriter writer = new PackIndexWriterV2(dst);
writer.write(objects, new byte[OBJECT_ID_LENGTH]);
}
try (FileOutputStream unused = new FileOutputStream(packFile)) {
// unused
}
assertEquals(id.abbreviate(20), reader.abbreviate(id, 2));
AbbreviatedObjectId abbrev8 = id.abbreviate(8);
Collection<ObjectId> matches = reader.resolve(abbrev8);
assertNotNull(matches);
assertEquals(objects.size(), matches.size());
for (PackedObjectInfo info : objects)
assertTrue("contains " + info.name(), matches.contains(info));
try {
db.resolve(abbrev8.name());
fail("did not throw AmbiguousObjectException");
} catch (AmbiguousObjectException err) {
assertEquals(abbrev8, err.getAbbreviatedObjectId());
matches = err.getCandidates();
assertNotNull(matches);
assertEquals(objects.size(), matches.size());
for (PackedObjectInfo info : objects)
assertTrue("contains " + info.name(), matches.contains(info));
}
assertEquals(id, db.resolve(id.abbreviate(20).name()));
}
private static ObjectId id(String name) {
return ObjectId.fromString(name);
}
private static byte[] toByteArray(ObjectId id) throws IOException {
ByteArrayOutputStream buf = new ByteArrayOutputStream(OBJECT_ID_LENGTH);
id.copyRawTo(buf);
return buf.toByteArray();
}
}
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