org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/GcPackRefsTest.java - sop/jgit - Git at Google

 /*
  * Copyright (C) 2012, Christian Halstrick <christian.halstrick@sap.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
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */

 package org.eclipse.jgit.internal.storage.file;

 import static org.hamcrest.Matchers.lessThanOrEqualTo;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertNull;
 import static org.junit.Assert.assertSame;
 import static org.junit.Assert.assertThat;

 import java.io.File;
 import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.concurrent.BrokenBarrierException;
 import java.util.concurrent.Callable;
 import java.util.concurrent.CyclicBarrier;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 import java.util.concurrent.Future;
 import java.util.concurrent.TimeUnit;

 import org.eclipse.jgit.api.Git;
 import org.eclipse.jgit.junit.TestRepository.BranchBuilder;
 import org.eclipse.jgit.lib.ConfigConstants;
 import org.eclipse.jgit.lib.Constants;
 import org.eclipse.jgit.lib.Ref.Storage;
 import org.eclipse.jgit.lib.RefUpdate;
 import org.eclipse.jgit.lib.RefUpdate.Result;
 import org.eclipse.jgit.revwalk.RevBlob;
 import org.eclipse.jgit.revwalk.RevCommit;
 import org.eclipse.jgit.storage.file.FileBasedConfig;
 import org.junit.Test;

 @SuppressWarnings("boxing")
 public class GcPackRefsTest extends GcTestCase {
 	@Test
 	public void looseRefPacked() throws Exception {
 		RevBlob a = tr.blob("a");
 		tr.lightweightTag("t", a);

 		gc.packRefs();
 		assertSame(repo.exactRef("refs/tags/t").getStorage(), Storage.PACKED);
 	}

 	@Test
 	public void emptyRefDirectoryDeleted() throws Exception {
 		String ref = "dir/ref";
 		tr.branch(ref).commit().create();
 		String name = repo.findRef(ref).getName();
 		Path dir = repo.getDirectory().toPath().resolve(name).getParent();
 		assertNotNull(dir);
 		gc.packRefs();
 		assertFalse(Files.exists(dir));
 	}

 	@Test
 	public void concurrentOnlyOneWritesPackedRefs() throws Exception {
 		RevBlob a = tr.blob("a");
 		tr.lightweightTag("t", a);

 		CyclicBarrier syncPoint = new CyclicBarrier(2);

 		// Returns 0 for success, 1 in case of error when writing pack.
 		Callable<Integer> packRefs = () -> {
 			syncPoint.await();
 			try {
 				gc.packRefs();
 				return 0;
 			} catch (IOException e) {
 				return 1;
 			}
 		};
 		ExecutorService pool = Executors.newFixedThreadPool(2);
 		try {
 			Future<Integer> p1 = pool.submit(packRefs);
 			Future<Integer> p2 = pool.submit(packRefs);
 			assertThat(p1.get() + p2.get(), lessThanOrEqualTo(1));
 		} finally {
 			pool.shutdown();
 			pool.awaitTermination(Long.MAX_VALUE, TimeUnit.SECONDS);
 		}
 	}

 	@Test
 	public void whileRefLockedRefNotPackedNoError()
 			throws Exception {
 		RevBlob a = tr.blob("a");
 		tr.lightweightTag("t1", a);
 		tr.lightweightTag("t2", a);
 		LockFile refLock = new LockFile(new File(repo.getDirectory(),
 				"refs/tags/t1"));
 		try {
 			refLock.lock();
 			gc.packRefs();
 		} finally {
 			refLock.unlock();
 		}

 		assertSame(repo.exactRef("refs/tags/t1").getStorage(), Storage.LOOSE);
 		assertSame(repo.exactRef("refs/tags/t2").getStorage(), Storage.PACKED);
 	}

 	@Test
 	public void whileRefUpdatedRefUpdateSucceeds()
 			throws Exception {
 		RevBlob a = tr.blob("a");
 		tr.lightweightTag("t", a);
 		final RevBlob b = tr.blob("b");

 		final CyclicBarrier refUpdateLockedRef = new CyclicBarrier(2);
 		final CyclicBarrier packRefsDone = new CyclicBarrier(2);
 		ExecutorService pool = Executors.newFixedThreadPool(2);
 		try {
 			Future<Result> result = pool.submit(new Callable<Result>() {

 				@Override
 				public Result call() throws Exception {
 					RefUpdate update = new RefDirectoryUpdate(
 							(RefDirectory) repo.getRefDatabase(),
 							repo.exactRef("refs/tags/t")) {
 						@Override
 						public boolean isForceUpdate() {
 							try {
 								refUpdateLockedRef.await();
 								packRefsDone.await();
 							} catch (InterruptedException e) {
 								Thread.currentThread().interrupt();
 							} catch (BrokenBarrierException e) {
 								Thread.currentThread().interrupt();
 							}
 							return super.isForceUpdate();
 						}
 					};
 					update.setForceUpdate(true);
 					update.setNewObjectId(b);
 					return update.update();
 				}
 			});

 			pool.submit(new Callable<Void>() {
 				@Override
 				public Void call() throws Exception {
 					refUpdateLockedRef.await();
 					gc.packRefs();
 					packRefsDone.await();
 					return null;
 				}
 			});

 			assertSame(result.get(), Result.FORCED);

 		} finally {
 			pool.shutdownNow();
 			pool.awaitTermination(Long.MAX_VALUE, TimeUnit.SECONDS);
 		}

 		assertEquals(repo.exactRef("refs/tags/t").getObjectId(), b);
 	}

 	@Test
 	public void dontPackHEAD_nonBare() throws Exception {
 		BranchBuilder bb = tr.branch("refs/heads/side");
 		RevCommit first = bb.commit().add("A", "A").add("B", "B").create();
 		bb.commit().add("A", "A2").add("B", "B2").create();
 		Git git = Git.wrap(repo);

 		// check for the unborn branch master. HEAD should point to master and
 		// master doesn't exist.
 		assertEquals(repo.exactRef("HEAD").getTarget().getName(),
 				"refs/heads/master");
 		assertNull(repo.exactRef("HEAD").getTarget().getObjectId());
 		gc.packRefs();
 		assertSame(repo.exactRef("HEAD").getStorage(), Storage.LOOSE);
 		assertEquals(repo.exactRef("HEAD").getTarget().getName(),
 				"refs/heads/master");
 		assertNull(repo.exactRef("HEAD").getTarget().getObjectId());

 		git.checkout().setName("refs/heads/side").call();
 		gc.packRefs();
 		assertSame(repo.exactRef("HEAD").getStorage(), Storage.LOOSE);

 		// check for detached HEAD
 		git.checkout().setName(first.getName()).call();
 		gc.packRefs();
 		assertSame(repo.exactRef("HEAD").getStorage(), Storage.LOOSE);
 	}

 	@Test
 	public void dontPackHEAD_bare() throws Exception {
 		BranchBuilder bb = tr.branch("refs/heads/side");
 		bb.commit().add("A", "A").add("B", "B").create();
 		RevCommit second = bb.commit().add("A", "A2").add("B", "B2").create();

 		// Convert the repo to be bare
 		FileBasedConfig cfg = repo.getConfig();
 		cfg.setBoolean(ConfigConstants.CONFIG_CORE_SECTION, null,
 				ConfigConstants.CONFIG_KEY_BARE, true);
 		cfg.save();
 		Git git = Git.open(repo.getDirectory());
 		repo = (FileRepository) git.getRepository();

 		// check for the unborn branch master. HEAD should point to master and
 		// master doesn't exist.
 		assertEquals(repo.exactRef("HEAD").getTarget().getName(),
 				"refs/heads/master");
 		assertNull(repo.exactRef("HEAD").getTarget().getObjectId());
 		gc.packRefs();
 		assertSame(repo.exactRef("HEAD").getStorage(), Storage.LOOSE);
 		assertEquals(repo.exactRef("HEAD").getTarget().getName(),
 				"refs/heads/master");
 		assertNull(repo.exactRef("HEAD").getTarget().getObjectId());

 		// check for non-detached HEAD
 		repo.updateRef(Constants.HEAD).link("refs/heads/side");
 		gc.packRefs();
 		assertSame(repo.exactRef("HEAD").getStorage(), Storage.LOOSE);
 		assertEquals(repo.exactRef("HEAD").getTarget().getObjectId(),
 				second.getId());
 	}
 }
	/*
	* Copyright (C) 2012, Christian Halstrick <christian.halstrick@sap.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
	* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
	* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
	* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
	* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
	* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/

	package org.eclipse.jgit.internal.storage.file;

	import static org.hamcrest.Matchers.lessThanOrEqualTo;
	import static org.junit.Assert.assertEquals;
	import static org.junit.Assert.assertFalse;
	import static org.junit.Assert.assertNotNull;
	import static org.junit.Assert.assertNull;
	import static org.junit.Assert.assertSame;
	import static org.junit.Assert.assertThat;

	import java.io.File;
	import java.io.IOException;
	import java.nio.file.Files;
	import java.nio.file.Path;
	import java.util.concurrent.BrokenBarrierException;
	import java.util.concurrent.Callable;
	import java.util.concurrent.CyclicBarrier;
	import java.util.concurrent.ExecutorService;
	import java.util.concurrent.Executors;
	import java.util.concurrent.Future;
	import java.util.concurrent.TimeUnit;

	import org.eclipse.jgit.api.Git;
	import org.eclipse.jgit.junit.TestRepository.BranchBuilder;
	import org.eclipse.jgit.lib.ConfigConstants;
	import org.eclipse.jgit.lib.Constants;
	import org.eclipse.jgit.lib.Ref.Storage;
	import org.eclipse.jgit.lib.RefUpdate;
	import org.eclipse.jgit.lib.RefUpdate.Result;
	import org.eclipse.jgit.revwalk.RevBlob;
	import org.eclipse.jgit.revwalk.RevCommit;
	import org.eclipse.jgit.storage.file.FileBasedConfig;
	import org.junit.Test;

	@SuppressWarnings("boxing")
	public class GcPackRefsTest extends GcTestCase {
	@Test
	public void looseRefPacked() throws Exception {
	RevBlob a = tr.blob("a");
	tr.lightweightTag("t", a);

	gc.packRefs();
	assertSame(repo.exactRef("refs/tags/t").getStorage(), Storage.PACKED);
	}

	@Test
	public void emptyRefDirectoryDeleted() throws Exception {
	String ref = "dir/ref";
	tr.branch(ref).commit().create();
	String name = repo.findRef(ref).getName();
	Path dir = repo.getDirectory().toPath().resolve(name).getParent();
	assertNotNull(dir);
	gc.packRefs();
	assertFalse(Files.exists(dir));
	}

	@Test
	public void concurrentOnlyOneWritesPackedRefs() throws Exception {
	RevBlob a = tr.blob("a");
	tr.lightweightTag("t", a);

	CyclicBarrier syncPoint = new CyclicBarrier(2);

	// Returns 0 for success, 1 in case of error when writing pack.
	Callable<Integer> packRefs = () -> {
	syncPoint.await();
	try {
	gc.packRefs();
	return 0;
	} catch (IOException e) {
	return 1;
	}
	};
	ExecutorService pool = Executors.newFixedThreadPool(2);
	try {
	Future<Integer> p1 = pool.submit(packRefs);
	Future<Integer> p2 = pool.submit(packRefs);
	assertThat(p1.get() + p2.get(), lessThanOrEqualTo(1));
	} finally {
	pool.shutdown();
	pool.awaitTermination(Long.MAX_VALUE, TimeUnit.SECONDS);
	}
	}

	@Test
	public void whileRefLockedRefNotPackedNoError()
	throws Exception {
	RevBlob a = tr.blob("a");
	tr.lightweightTag("t1", a);
	tr.lightweightTag("t2", a);
	LockFile refLock = new LockFile(new File(repo.getDirectory(),
	"refs/tags/t1"));
	try {
	refLock.lock();
	gc.packRefs();
	} finally {
	refLock.unlock();
	}

	assertSame(repo.exactRef("refs/tags/t1").getStorage(), Storage.LOOSE);
	assertSame(repo.exactRef("refs/tags/t2").getStorage(), Storage.PACKED);
	}

	@Test
	public void whileRefUpdatedRefUpdateSucceeds()
	throws Exception {
	RevBlob a = tr.blob("a");
	tr.lightweightTag("t", a);
	final RevBlob b = tr.blob("b");

	final CyclicBarrier refUpdateLockedRef = new CyclicBarrier(2);
	final CyclicBarrier packRefsDone = new CyclicBarrier(2);
	ExecutorService pool = Executors.newFixedThreadPool(2);
	try {
	Future<Result> result = pool.submit(new Callable<Result>() {

	@Override
	public Result call() throws Exception {
	RefUpdate update = new RefDirectoryUpdate(
	(RefDirectory) repo.getRefDatabase(),
	repo.exactRef("refs/tags/t")) {
	@Override
	public boolean isForceUpdate() {
	try {
	refUpdateLockedRef.await();
	packRefsDone.await();
	} catch (InterruptedException e) {
	Thread.currentThread().interrupt();
	} catch (BrokenBarrierException e) {
	Thread.currentThread().interrupt();
	}
	return super.isForceUpdate();
	}
	};
	update.setForceUpdate(true);
	update.setNewObjectId(b);
	return update.update();
	}
	});

	pool.submit(new Callable<Void>() {
	@Override
	public Void call() throws Exception {
	refUpdateLockedRef.await();
	gc.packRefs();
	packRefsDone.await();
	return null;
	}
	});

	assertSame(result.get(), Result.FORCED);

	} finally {
	pool.shutdownNow();
	pool.awaitTermination(Long.MAX_VALUE, TimeUnit.SECONDS);
	}

	assertEquals(repo.exactRef("refs/tags/t").getObjectId(), b);
	}

	@Test
	public void dontPackHEAD_nonBare() throws Exception {
	BranchBuilder bb = tr.branch("refs/heads/side");
	RevCommit first = bb.commit().add("A", "A").add("B", "B").create();
	bb.commit().add("A", "A2").add("B", "B2").create();
	Git git = Git.wrap(repo);

	// check for the unborn branch master. HEAD should point to master and
	// master doesn't exist.
	assertEquals(repo.exactRef("HEAD").getTarget().getName(),
	"refs/heads/master");
	assertNull(repo.exactRef("HEAD").getTarget().getObjectId());
	gc.packRefs();
	assertSame(repo.exactRef("HEAD").getStorage(), Storage.LOOSE);
	assertEquals(repo.exactRef("HEAD").getTarget().getName(),
	"refs/heads/master");
	assertNull(repo.exactRef("HEAD").getTarget().getObjectId());

	git.checkout().setName("refs/heads/side").call();
	gc.packRefs();
	assertSame(repo.exactRef("HEAD").getStorage(), Storage.LOOSE);

	// check for detached HEAD
	git.checkout().setName(first.getName()).call();
	gc.packRefs();
	assertSame(repo.exactRef("HEAD").getStorage(), Storage.LOOSE);
	}

	@Test
	public void dontPackHEAD_bare() throws Exception {
	BranchBuilder bb = tr.branch("refs/heads/side");
	bb.commit().add("A", "A").add("B", "B").create();
	RevCommit second = bb.commit().add("A", "A2").add("B", "B2").create();

	// Convert the repo to be bare
	FileBasedConfig cfg = repo.getConfig();
	cfg.setBoolean(ConfigConstants.CONFIG_CORE_SECTION, null,
	ConfigConstants.CONFIG_KEY_BARE, true);
	cfg.save();
	Git git = Git.open(repo.getDirectory());
	repo = (FileRepository) git.getRepository();

	// check for the unborn branch master. HEAD should point to master and
	// master doesn't exist.
	assertEquals(repo.exactRef("HEAD").getTarget().getName(),
	"refs/heads/master");
	assertNull(repo.exactRef("HEAD").getTarget().getObjectId());
	gc.packRefs();
	assertSame(repo.exactRef("HEAD").getStorage(), Storage.LOOSE);
	assertEquals(repo.exactRef("HEAD").getTarget().getName(),
	"refs/heads/master");
	assertNull(repo.exactRef("HEAD").getTarget().getObjectId());

	// check for non-detached HEAD
	repo.updateRef(Constants.HEAD).link("refs/heads/side");
	gc.packRefs();
	assertSame(repo.exactRef("HEAD").getStorage(), Storage.LOOSE);
	assertEquals(repo.exactRef("HEAD").getTarget().getObjectId(),
	second.getId());
	}
	}