| /* |
| * 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.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))); |
| } |
| |
| String packName = "pack-" + id.name(); |
| File packDir = db.getObjectDatabase().getPackDirectory(); |
| File idxFile = new File(packDir, packName + ".idx"); |
| File packFile = new File(packDir, packName + ".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(); |
| } |
| } |