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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.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();
- }
- }
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