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Merge branch 'stable-5.5' 

* stable-5.5:
  WorkingTreeIterator: handle different timestamp resolutions

Change-Id: I61df7392d8826ab526c39da2a8718723a1cc602a
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
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Matthias Sohn 5 years ago
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3 changed files with 307 additions and 18 deletions
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  1. 182
      org.eclipse.jgit.test/tst/org/eclipse/jgit/treewalk/InstantComparatorTest.java
  2. 112
      org.eclipse.jgit/src/org/eclipse/jgit/treewalk/InstantComparator.java
  3. 31
      org.eclipse.jgit/src/org/eclipse/jgit/treewalk/WorkingTreeIterator.java

182
org.eclipse.jgit.test/tst/org/eclipse/jgit/treewalk/InstantComparatorTest.java
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@ -0,0 +1,182 @@
/*
* Copyright (C) 2019, Thomas Wolf <thomas.wolf@paranor.ch>
* 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.treewalk;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import java.time.Instant;
import org.junit.Test;
public class InstantComparatorTest {
private final InstantComparator cmp = new InstantComparator();
@Test
public void compareNow() {
Instant now = Instant.now();
assertEquals(0, cmp.compare(now, now));
assertEquals(0, cmp.compare(now, now, true));
}
@Test
public void compareSeconds() {
Instant now = Instant.now();
Instant t = Instant.ofEpochSecond(now.getEpochSecond());
Instant s = Instant.ofEpochSecond(now.getEpochSecond(), 123456789);
assertEquals(0, cmp.compare(t, s));
assertEquals(0, cmp.compare(t, t));
assertEquals(0, cmp.compare(s, t));
}
@Test
public void compareSecondsOnly() {
Instant now = Instant.now();
Instant t = Instant.ofEpochSecond(now.getEpochSecond(), 987654321);
Instant s = Instant.ofEpochSecond(now.getEpochSecond(), 123456789);
assertEquals(0, cmp.compare(t, s, true));
assertEquals(0, cmp.compare(t, t, true));
assertEquals(0, cmp.compare(s, t, true));
}
@Test
public void compareSecondsUnequal() {
Instant now = Instant.now();
Instant t = Instant.ofEpochSecond(now.getEpochSecond());
Instant s = Instant.ofEpochSecond(now.getEpochSecond() - 1L);
assertTrue(cmp.compare(s, t) < 0);
assertTrue(cmp.compare(t, s) > 0);
}
@Test
public void compareMillisEqual() {
Instant now = Instant.now();
Instant t = Instant.ofEpochSecond(now.getEpochSecond(), 123000000);
Instant s = Instant.ofEpochSecond(now.getEpochSecond(), 123456789);
assertEquals(0, cmp.compare(s, t));
assertEquals(0, cmp.compare(t, t));
assertEquals(0, cmp.compare(t, s));
s = Instant.ofEpochSecond(now.getEpochSecond(), 123456000);
assertEquals(0, cmp.compare(s, t));
assertEquals(0, cmp.compare(t, s));
s = Instant.ofEpochSecond(now.getEpochSecond(), 123400000);
assertEquals(0, cmp.compare(s, t));
assertEquals(0, cmp.compare(t, s));
}
@Test
public void compareMillisUnequal() {
Instant now = Instant.now();
Instant t = Instant.ofEpochSecond(now.getEpochSecond(), 123000000);
Instant s = Instant.ofEpochSecond(now.getEpochSecond(), 122000000);
assertTrue(cmp.compare(s, t) < 0);
assertTrue(cmp.compare(t, s) > 0);
t = Instant.ofEpochSecond(now.getEpochSecond(), 130000000);
assertTrue(cmp.compare(s, t) < 0);
assertTrue(cmp.compare(t, s) > 0);
t = Instant.ofEpochSecond(now.getEpochSecond(), 200000000);
assertTrue(cmp.compare(s, t) < 0);
assertTrue(cmp.compare(t, s) > 0);
s = Instant.ofEpochSecond(now.getEpochSecond() - 1L, 123000000);
assertTrue(cmp.compare(s, t) < 0);
assertTrue(cmp.compare(t, s) > 0);
}
@Test
public void compareMicrosEqual() {
Instant now = Instant.now();
Instant t = Instant.ofEpochSecond(now.getEpochSecond(), 123456000);
Instant s = Instant.ofEpochSecond(now.getEpochSecond(), 123456789);
assertEquals(0, cmp.compare(s, t));
assertEquals(0, cmp.compare(t, s));
s = Instant.ofEpochSecond(now.getEpochSecond(), 123456700);
assertEquals(0, cmp.compare(s, t));
assertEquals(0, cmp.compare(t, s));
}
@Test
public void compareMicrosUnequal() {
Instant now = Instant.now();
Instant t = Instant.ofEpochSecond(now.getEpochSecond(), 123456000);
Instant s = Instant.ofEpochSecond(now.getEpochSecond(), 123455000);
assertTrue(cmp.compare(s, t) < 0);
assertTrue(cmp.compare(t, s) > 0);
t = Instant.ofEpochSecond(now.getEpochSecond(), 123460000);
assertTrue(cmp.compare(s, t) < 0);
assertTrue(cmp.compare(t, s) > 0);
t = Instant.ofEpochSecond(now.getEpochSecond(), 123500000);
assertTrue(cmp.compare(s, t) < 0);
assertTrue(cmp.compare(t, s) > 0);
s = Instant.ofEpochSecond(now.getEpochSecond() - 1L, 123456000);
assertTrue(cmp.compare(s, t) < 0);
assertTrue(cmp.compare(t, s) > 0);
}
@Test
public void compareNanosEqual() {
Instant now = Instant.now();
Instant t = Instant.ofEpochSecond(now.getEpochSecond(), 123456789);
Instant s = Instant.ofEpochSecond(now.getEpochSecond(), 123456789);
assertEquals(0, cmp.compare(s, t));
assertEquals(0, cmp.compare(t, s));
}
@Test
public void compareNanosUnequal() {
Instant now = Instant.now();
Instant t = Instant.ofEpochSecond(now.getEpochSecond(), 123456789);
Instant s = Instant.ofEpochSecond(now.getEpochSecond(), 123456700);
assertTrue(cmp.compare(s, t) < 0);
assertTrue(cmp.compare(t, s) > 0);
t = Instant.ofEpochSecond(now.getEpochSecond(), 123456800);
assertTrue(cmp.compare(s, t) < 0);
assertTrue(cmp.compare(t, s) > 0);
s = Instant.ofEpochSecond(now.getEpochSecond() - 1L, 123456789);
assertTrue(cmp.compare(s, t) < 0);
assertTrue(cmp.compare(t, s) > 0);
s = Instant.ofEpochSecond(now.getEpochSecond(), 123456788);
assertTrue(cmp.compare(s, t) < 0);
assertTrue(cmp.compare(t, s) > 0);
}
}

112
org.eclipse.jgit/src/org/eclipse/jgit/treewalk/InstantComparator.java
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@ -0,0 +1,112 @@
/*
* Copyright (C) 2019, Thomas Wolf <thomas.wolf@paranor.ch>
* 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.treewalk;
import java.time.Instant;
import java.util.Comparator;
/**
* Specialized comparator for {@link Instant}s. If either timestamp has a zero
* fraction, compares only seconds. If either timestamp has no time fraction
* smaller than a millisecond, compares only milliseconds. If either timestamp
* has no fraction smaller than a microsecond, compares only microseconds.
*/
class InstantComparator implements Comparator<Instant> {
@Override
public int compare(Instant a, Instant b) {
return compare(a, b, false);
}
/**
* Compares two {@link Instant}s to the lower resolution of the two
* instants. See {@link InstantComparator}.
*
* @param a
* first {@link Instant} to compare
* @param b
* second {@link Instant} to compare
* @param forceSecondsOnly
* whether to omit all fraction comparison
* @return a value &lt; 0 if a &lt; b, a value &gt; 0 if a &gt; b, and 0 if
* a == b
*/
public int compare(Instant a, Instant b, boolean forceSecondsOnly) {
long aSeconds = a.getEpochSecond();
long bSeconds = b.getEpochSecond();
int result = Long.compare(aSeconds, bSeconds);
if (result != 0) {
return result;
}
int aSubSecond = a.getNano();
int bSubSecond = b.getNano();
if (forceSecondsOnly || (aSubSecond == 0)
|| (bSubSecond == 0)) {
// Don't check the subseconds part.
return 0;
} else if (aSubSecond != bSubSecond) {
// If either has nothing smaller than a millisecond, compare only
// milliseconds.
int aSubMillis = aSubSecond % 1_000_000;
int bSubMillis = bSubSecond % 1_000_000;
if (aSubMillis == 0) {
bSubSecond -= bSubMillis;
} else if (bSubMillis == 0) {
aSubSecond -= aSubMillis;
} else {
// Same again, but for microsecond resolution. NTFS has 100ns
// resolution, but WindowsFileAttributes may provide only
// microseconds (1000ns). Similar for some Unix file systems.
int aSubMicros = aSubSecond % 1000;
int bSubMicros = bSubSecond % 1000;
if (aSubMicros == 0) {
bSubSecond -= bSubMicros;
} else if (bSubMicros == 0) {
aSubSecond -= aSubMicros;
}
}
}
return Integer.compare(aSubSecond, bSubSecond);
}
}

31
org.eclipse.jgit/src/org/eclipse/jgit/treewalk/WorkingTreeIterator.java
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@ -174,6 +174,9 @@ public abstract class WorkingTreeIterator extends AbstractTreeIterator {
/** The offset of the content id in {@link #idBuffer()} */ /** The offset of the content id in {@link #idBuffer()} */
private int contentIdOffset; private int contentIdOffset;
/** A comparator for {@link Instant}s. */
private final InstantComparator timestampComparator = new InstantComparator();
/** /**
* Create a new iterator with no parent. * Create a new iterator with no parent.
* *
@ -931,27 +934,19 @@ public abstract class WorkingTreeIterator extends AbstractTreeIterator {
if (!entry.isSmudged() && entry.getLength() != (int) getEntryLength()) if (!entry.isSmudged() && entry.getLength() != (int) getEntryLength())
return MetadataDiff.DIFFER_BY_METADATA; return MetadataDiff.DIFFER_BY_METADATA;
// Git under windows only stores seconds so we round the timestamp // Cache and file timestamps may differ in resolution. Therefore don't
// Java gives us if it looks like the timestamp in index is seconds // compare instants directly but use a comparator that compares only
// only. Otherwise we compare the timestamp at nanosecond precision, // up to the lower apparent resolution of either timestamp.
// unless core.checkstat is set to "minimal", in which case we only //
// compare the whole second part. // If core.checkstat is set to "minimal", compare only the seconds part.
Instant cacheLastModified = entry.getLastModifiedInstant(); Instant cacheLastModified = entry.getLastModifiedInstant();
Instant fileLastModified = getEntryLastModifiedInstant(); Instant fileLastModified = getEntryLastModifiedInstant();
if ((getOptions().getCheckStat() == CheckStat.MINIMAL) if (timestampComparator.compare(cacheLastModified, fileLastModified,
|| (cacheLastModified.getNano() == 0) getOptions().getCheckStat() == CheckStat.MINIMAL) != 0) {
// Some Java version on Linux return whole seconds only even
// when the file systems supports more precision.
|| (fileLastModified.getNano() == 0)) {
if (fileLastModified.getEpochSecond() != cacheLastModified
.getEpochSecond()) {
return MetadataDiff.DIFFER_BY_TIMESTAMP;
} else if (entry.isSmudged()) {
return MetadataDiff.SMUDGED;
}
} else if (!fileLastModified.equals(cacheLastModified)) {
return MetadataDiff.DIFFER_BY_TIMESTAMP; return MetadataDiff.DIFFER_BY_TIMESTAMP;
} else if (entry.isSmudged()) { }
if (entry.isSmudged()) {
return MetadataDiff.SMUDGED; return MetadataDiff.SMUDGED;
} }
// The file is clean when when comparing timestamps // The file is clean when when comparing timestamps

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