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- /*
- * Copyright (C) 2010, Christian Halstrick <christian.halstrick@sap.com> 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.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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