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- /*
- * Copyright (C) 2010, 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.lib;
-
- import static java.nio.charset.StandardCharsets.UTF_8;
- import static org.junit.Assert.assertEquals;
- import static org.junit.Assert.assertFalse;
- import static org.junit.Assert.assertTrue;
-
- import java.io.File;
- import java.io.FileOutputStream;
- import java.io.IOException;
- import java.time.Instant;
-
- import org.eclipse.jgit.api.Git;
- import org.eclipse.jgit.dircache.DirCache;
- import org.eclipse.jgit.junit.RepositoryTestCase;
- import org.eclipse.jgit.junit.time.TimeUtil;
- import org.eclipse.jgit.treewalk.FileTreeIterator;
- import org.eclipse.jgit.treewalk.WorkingTreeOptions;
- import org.eclipse.jgit.util.FS;
- import org.junit.Test;
-
- public class RacyGitTests extends RepositoryTestCase {
-
- @Test
- public void testRacyGitDetection() throws Exception {
- // Reset to force creation of index file
- try (Git git = new Git(db)) {
- git.reset().call();
- }
-
- // wait to ensure that modtimes of the file doesn't match last index
- // file modtime
- fsTick(db.getIndexFile());
-
- // create two files
- File a = writeToWorkDir("a", "a");
- File b = writeToWorkDir("b", "b");
- TimeUtil.setLastModifiedOf(a.toPath(), b.toPath());
- TimeUtil.setLastModifiedOf(b.toPath(), b.toPath());
-
- // wait to ensure that file-modTimes and therefore index entry modTime
- // doesn't match the modtime of index-file after next persistance
- fsTick(b);
-
- // now add both files to the index. No racy git expected
- resetIndex(new FileTreeIterator(db));
-
- assertEquals(
- "[a, mode:100644, time:t0, length:1, content:a]"
- + "[b, mode:100644, time:t0, length:1, content:b]",
- indexState(SMUDGE | MOD_TIME | LENGTH | CONTENT));
-
- // wait to ensure the file 'a' is updated at t1.
- fsTick(db.getIndexFile());
-
- // Create a racy git situation. This is a situation that the index is
- // updated and then a file is modified within the same tick of the
- // filesystem timestamp resolution. By changing the index file
- // artificially, we create a fake racy situation.
- File updatedA = writeToWorkDir("a", "a2");
- Instant newLastModified = TimeUtil
- .setLastModifiedWithOffset(updatedA.toPath(), 100L);
- resetIndex(new FileTreeIterator(db));
- FS.DETECTED.setLastModified(db.getIndexFile().toPath(),
- newLastModified);
-
- DirCache dc = db.readDirCache();
- // check index state: although racily clean a should not be reported as
- // being dirty since we forcefully reset the index to match the working
- // tree
- assertEquals(
- "[a, mode:100644, time:t1, smudged, length:0, content:a2]"
- + "[b, mode:100644, time:t0, length:1, content:b]",
- indexState(SMUDGE | MOD_TIME | LENGTH | CONTENT));
-
- // compare state of files in working tree with index to check that
- // FileTreeIterator.isModified() works as expected
- FileTreeIterator f = new FileTreeIterator(db.getWorkTree(), db.getFS(),
- db.getConfig().get(WorkingTreeOptions.KEY));
- assertTrue(f.findFile("a"));
- try (ObjectReader reader = db.newObjectReader()) {
- assertFalse(f.isModified(dc.getEntry("a"), false, reader));
- }
- }
-
- private File writeToWorkDir(String path, String content) throws IOException {
- File f = new File(db.getWorkTree(), path);
- try (FileOutputStream fos = new FileOutputStream(f)) {
- fos.write(content.getBytes(UTF_8));
- return f;
- }
- }
- }
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