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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 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 org.eclipse.jgit.api.Git;
import org.eclipse.jgit.dircache.DirCache;
import org.eclipse.jgit.junit.RepositoryTestCase;
import org.eclipse.jgit.treewalk.FileTreeIterator;
import org.eclipse.jgit.treewalk.WorkingTreeOptions;
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");
assertTrue(a.setLastModified(b.lastModified()));
assertTrue(b.setLastModified(b.lastModified()));
// 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");
long newLastModified = updatedA.lastModified() + 100;
assertTrue(updatedA.setLastModified(newLastModified));
resetIndex(new FileTreeIterator(db));
assertTrue(db.getIndexFile().setLastModified(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);
FileOutputStream fos = new FileOutputStream(f);
try {
fos.write(content.getBytes(Constants.CHARACTER_ENCODING));
return f;
} finally {
fos.close();
}
}
}
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