/*
* 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.
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* products derived from this software without specific prior
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*
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package org.eclipse.jgit.lib;
import static java.lang.Long.valueOf;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.TreeSet;
import org.eclipse.jgit.junit.RepositoryTestCase;
import org.eclipse.jgit.treewalk.FileTreeIterator;
import org.eclipse.jgit.treewalk.FileTreeIteratorWithTimeControl;
import org.eclipse.jgit.treewalk.NameConflictTreeWalk;
import org.eclipse.jgit.util.FileUtils;
public class RacyGitTests extends RepositoryTestCase {
public void testIterator() throws IllegalStateException, IOException,
InterruptedException {
TreeSet<Long> modTimes = new TreeSet<Long>();
File lastFile = null;
for (int i = 0; i < 10; i++) {
lastFile = new File(db.getWorkTree(), "0." + i);
FileUtils.createNewFile(lastFile);
if (i == 5)
fsTick(lastFile);
}
modTimes.add(valueOf(fsTick(lastFile)));
for (int i = 0; i < 10; i++) {
lastFile = new File(db.getWorkTree(), "1." + i);
FileUtils.createNewFile(lastFile);
}
modTimes.add(valueOf(fsTick(lastFile)));
for (int i = 0; i < 10; i++) {
lastFile = new File(db.getWorkTree(), "2." + i);
FileUtils.createNewFile(lastFile);
if (i % 4 == 0)
fsTick(lastFile);
}
FileTreeIteratorWithTimeControl fileIt = new FileTreeIteratorWithTimeControl(
db, modTimes);
NameConflictTreeWalk tw = new NameConflictTreeWalk(db);
tw.addTree(fileIt);
tw.setRecursive(true);
FileTreeIterator t;
long t0 = 0;
for (int i = 0; i < 10; i++) {
assertTrue(tw.next());
t = tw.getTree(0, FileTreeIterator.class);
if (i == 0)
t0 = t.getEntryLastModified();
else
assertEquals(t0, t.getEntryLastModified());
}
long t1 = 0;
for (int i = 0; i < 10; i++) {
assertTrue(tw.next());
t = tw.getTree(0, FileTreeIterator.class);
if (i == 0) {
t1 = t.getEntryLastModified();
assertTrue(t1 > t0);
} else
assertEquals(t1, t.getEntryLastModified());
}
long t2 = 0;
for (int i = 0; i < 10; i++) {
assertTrue(tw.next());
t = tw.getTree(0, FileTreeIterator.class);
if (i == 0) {
t2 = t.getEntryLastModified();
assertTrue(t2 > t1);
} else
assertEquals(t2, t.getEntryLastModified());
}
}
public void testRacyGitDetection() throws IOException,
IllegalStateException, InterruptedException {
TreeSet<Long> modTimes = new TreeSet<Long>();
File lastFile;
// wait to ensure that modtimes of the file doesn't match last index
// file modtime
modTimes.add(valueOf(fsTick(db.getIndexFile())));
// create two files
addToWorkDir("a", "a");
lastFile = addToWorkDir("b", "b");
// wait to ensure that file-modTimes and therefore index entry modTime
// doesn't match the modtime of index-file after next persistance
modTimes.add(valueOf(fsTick(lastFile)));
// now add both files to the index. No racy git expected
resetIndex(new FileTreeIteratorWithTimeControl(db, modTimes));
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));
// Remember the last modTime of index file. All modifications times of
// further modification are translated to this value so it looks that
// files have been modified in the same time slot as the index file
modTimes.add(Long.valueOf(db.getIndexFile().lastModified()));
// modify one file
addToWorkDir("a", "a2");
// now update the index the index. 'a' has to be racily clean -- because
// it's modification time is exactly the same as the previous index file
// mod time.
resetIndex(new FileTreeIteratorWithTimeControl(db, modTimes));
db.readDirCache();
// although racily clean a should not be reported as being dirty
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));
}
private File addToWorkDir(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();
}
}
}