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Merge branch 'stable-4.10' into stable-4.11

* stable-4.10:
  Bazel: Update bazlets to the latest master revision
  Bazel: Remove FileTreeIteratorWithTimeControl from BUILD file
  BatchRefUpdate: repro racy atomic update, and fix it
  Delete unused FileTreeIteratorWithTimeControl
  Fix RacyGitTests#testRacyGitDetection
  Change RacyGitTests to create a racy git situation in a stable way
  Silence API warnings

Change-Id: If672b4f0c350f4e8ff7e1e706485cffd8137236d
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
tags/v4.11.9.201909030838-r
Matthias Sohn 4 years ago
parent
commit
b0fd436c62

+ 1
- 1
WORKSPACE View File

@@ -2,7 +2,7 @@ workspace(name = "jgit")

load("//tools:bazlets.bzl", "load_bazlets")

load_bazlets(commit = "3afbeab55ece585dbfc7a980bf7214b24ddbbe86")
load_bazlets(commit = "09a035e98077dce549d5f6a7472d06c4b8f792d2")

load(
"@com_googlesource_gerrit_bazlets//tools:maven_jar.bzl",

+ 35
- 0
org.eclipse.jgit.lfs/.settings/.api_filters View File

@@ -0,0 +1,35 @@
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<component id="org.eclipse.jgit.lfs" version="2">
<resource path="META-INF/MANIFEST.MF">
<filter id="923795461">
<message_arguments>
<message_argument value="4.11.9"/>
<message_argument value="4.10.0"/>
</message_arguments>
</filter>
</resource>
<resource path="src/org/eclipse/jgit/lfs/CleanFilter.java" type="org.eclipse.jgit.lfs.CleanFilter">
<filter id="421572723">
<message_arguments>
<message_argument value="org.eclipse.jgit.lfs.CleanFilter"/>
<message_argument value="register()"/>
</message_arguments>
</filter>
</resource>
<resource path="src/org/eclipse/jgit/lfs/LfsPointer.java" type="org.eclipse.jgit.lfs.LfsPointer">
<filter id="336658481">
<message_arguments>
<message_argument value="org.eclipse.jgit.lfs.LfsPointer"/>
<message_argument value="SIZE_THRESHOLD"/>
</message_arguments>
</filter>
</resource>
<resource path="src/org/eclipse/jgit/lfs/SmudgeFilter.java" type="org.eclipse.jgit.lfs.SmudgeFilter">
<filter id="421572723">
<message_arguments>
<message_argument value="org.eclipse.jgit.lfs.SmudgeFilter"/>
<message_argument value="register()"/>
</message_arguments>
</filter>
</resource>
</component>

+ 0
- 1
org.eclipse.jgit.test/BUILD View File

@@ -19,7 +19,6 @@ HELPERS = glob(["src/**/*.java"]) + [PKG + c for c in [
"revwalk/RevQueueTestCase.java",
"revwalk/RevWalkTestCase.java",
"transport/SpiTransport.java",
"treewalk/FileTreeIteratorWithTimeControl.java",
"treewalk/filter/AlwaysCloneTreeFilter.java",
"test/resources/SampleDataRepositoryTestCase.java",
"util/CPUTimeStopWatch.java",

+ 29
- 0
org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/BatchRefUpdateTest.java View File

@@ -43,6 +43,7 @@

package org.eclipse.jgit.internal.storage.file;

import static java.nio.charset.StandardCharsets.UTF_8;
import static java.util.concurrent.TimeUnit.NANOSECONDS;
import static java.util.concurrent.TimeUnit.SECONDS;
import static org.eclipse.jgit.internal.storage.file.BatchRefUpdateTest.Result.LOCK_FAILURE;
@@ -64,6 +65,7 @@ import static org.junit.Assume.assumeTrue;

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
@@ -161,6 +163,33 @@ public class BatchRefUpdateTest extends LocalDiskRepositoryTestCase {
refsChangedEvents = 0;
}

@Test
public void packedRefsFileIsSorted() throws IOException {
assumeTrue(atomic);

for (int i = 0; i < 2; i++) {
BatchRefUpdate bu = diskRepo.getRefDatabase().newBatchUpdate();
String b1 = String.format("refs/heads/a%d",i);
String b2 = String.format("refs/heads/b%d",i);
bu.setAtomic(atomic);
ReceiveCommand c1 = new ReceiveCommand(ObjectId.zeroId(), A, b1);
ReceiveCommand c2 = new ReceiveCommand(ObjectId.zeroId(), B, b2);
bu.addCommand(c1, c2);
try (RevWalk rw = new RevWalk(diskRepo)) {
bu.execute(rw, NullProgressMonitor.INSTANCE);
}
assertEquals(c1.getResult(), ReceiveCommand.Result.OK);
assertEquals(c2.getResult(), ReceiveCommand.Result.OK);
}

File packed = new File(diskRepo.getDirectory(), "packed-refs");
String packedStr = new String(Files.readAllBytes(packed.toPath()), UTF_8);

int a2 = packedStr.indexOf("refs/heads/a1");
int b1 = packedStr.indexOf("refs/heads/b0");
assertTrue(a2 < b1);
}

@Test
public void simpleNoForce() throws IOException {
writeLooseRef("refs/heads/master", A);

+ 40
- 94
org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/RacyGitTests.java View File

@@ -42,93 +42,25 @@
*/
package org.eclipse.jgit.lib;

import static java.lang.Long.valueOf;
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.util.TreeSet;

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.FileTreeIteratorWithTimeControl;
import org.eclipse.jgit.treewalk.NameConflictTreeWalk;
import org.eclipse.jgit.util.FileUtils;
import org.eclipse.jgit.treewalk.WorkingTreeOptions;
import org.junit.Test;

public class RacyGitTests extends RepositoryTestCase {
@Test
public void testIterator() throws IllegalStateException, IOException,
InterruptedException {
TreeSet<Long> modTimes = new TreeSet<>();
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);
try (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());
}
}
}
}

@Test
public void testRacyGitDetection() throws Exception {
TreeSet<Long> modTimes = new TreeSet<>();
File lastFile;

// Reset to force creation of index file
try (Git git = new Git(db)) {
git.reset().call();
@@ -136,45 +68,59 @@ public class RacyGitTests extends RepositoryTestCase {

// wait to ensure that modtimes of the file doesn't match last index
// file modtime
modTimes.add(valueOf(fsTick(db.getIndexFile())));
fsTick(db.getIndexFile());

// create two files
addToWorkDir("a", "a");
lastFile = addToWorkDir("b", "b");
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
modTimes.add(valueOf(fsTick(lastFile)));
fsTick(b);

// now add both files to the index. No racy git expected
resetIndex(new FileTreeIteratorWithTimeControl(db, modTimes));
resetIndex(new FileTreeIterator(db));

assertEquals(
"[a, mode:100644, time:t0, length:1, content:a]" +
"[b, mode:100644, time:t0, length:1, content:b]",
"[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()));
// wait to ensure the file 'a' is updated at t1.
fsTick(db.getIndexFile());

// 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));
// 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));

db.readDirCache();
// although racily clean a should not be reported as being dirty
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));
"[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 addToWorkDir(String path, String content) throws IOException {
private File writeToWorkDir(String path, String content) throws IOException {
File f = new File(db.getWorkTree(), path);
FileOutputStream fos = new FileOutputStream(f);
try {

+ 0
- 109
org.eclipse.jgit.test/tst/org/eclipse/jgit/treewalk/FileTreeIteratorWithTimeControl.java View File

@@ -1,109 +0,0 @@
/*
* 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.treewalk;

import java.io.File;
import java.util.SortedSet;
import java.util.TreeSet;

import org.eclipse.jgit.lib.Config;
import org.eclipse.jgit.lib.ObjectReader;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.util.FS;

/**
* A {@link FileTreeIterator} used in tests which allows to specify explicitly
* what will be returned by {@link #getEntryLastModified()}. This allows to
* write tests where certain files have to have the same modification time.
* <p>
* This iterator is configured by a list of strictly increasing long values
* t(0), t(1), ..., t(n). For each file with a modification between t(x) and
* t(x+1) [ t(x) &lt;= time &lt; t(x+1) ] this iterator will report t(x). For
* files with a modification time smaller t(0) a modification time of 0 is
* returned. For files with a modification time greater or equal t(n) t(n) will
* be returned.
* <p>
* This class was written especially to test racy-git problems
*/
public class FileTreeIteratorWithTimeControl extends FileTreeIterator {
private TreeSet<Long> modTimes;

public FileTreeIteratorWithTimeControl(FileTreeIterator p, Repository repo,
TreeSet<Long> modTimes) {
super(p, repo.getWorkTree(), repo.getFS());
this.modTimes = modTimes;
}

public FileTreeIteratorWithTimeControl(FileTreeIterator p, File f, FS fs,
TreeSet<Long> modTimes) {
super(p, f, fs);
this.modTimes = modTimes;
}

public FileTreeIteratorWithTimeControl(Repository repo,
TreeSet<Long> modTimes) {
super(repo);
this.modTimes = modTimes;
}

public FileTreeIteratorWithTimeControl(File f, FS fs,
TreeSet<Long> modTimes) {
super(f, fs, new Config().get(WorkingTreeOptions.KEY));
this.modTimes = modTimes;
}

@Override
public AbstractTreeIterator createSubtreeIterator(final ObjectReader reader) {
return new FileTreeIteratorWithTimeControl(this,
((FileEntry) current()).getFile(), fs, modTimes);
}

@Override
public long getEntryLastModified() {
if (modTimes == null)
return 0;
Long cutOff = Long.valueOf(super.getEntryLastModified() + 1);
SortedSet<Long> head = modTimes.headSet(cutOff);
return head.isEmpty() ? 0 : head.last().longValue();
}
}

+ 52
- 4
org.eclipse.jgit/.settings/.api_filters View File

@@ -1,10 +1,10 @@
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<component id="org.eclipse.jgit" version="2">
<resource path="META-INF/MANIFEST.MF">
<filter id="924844039">
<resource path="src/org/eclipse/jgit/diff/DiffEntry.java" type="org.eclipse.jgit.diff.DiffEntry">
<filter id="336658481">
<message_arguments>
<message_argument value="4.11.7"/>
<message_argument value="4.11.0"/>
<message_argument value="org.eclipse.jgit.diff.DiffEntry"/>
<message_argument value="diffAttribute"/>
</message_arguments>
</filter>
</resource>
@@ -22,6 +22,20 @@
</message_arguments>
</filter>
</resource>
<resource path="src/org/eclipse/jgit/lib/ConfigConstants.java" type="org.eclipse.jgit.lib.ConfigConstants">
<filter id="336658481">
<message_arguments>
<message_argument value="org.eclipse.jgit.lib.ConfigConstants"/>
<message_argument value="CONFIG_KEY_REQUIRED"/>
</message_arguments>
</filter>
<filter id="336658481">
<message_arguments>
<message_argument value="org.eclipse.jgit.lib.ConfigConstants"/>
<message_argument value="CONFIG_SECTION_LFS"/>
</message_arguments>
</filter>
</resource>
<resource path="src/org/eclipse/jgit/lib/Constants.java" type="org.eclipse.jgit.lib.Constants">
<filter id="1141899266">
<message_arguments>
@@ -47,6 +61,40 @@
</message_arguments>
</filter>
</resource>
<resource path="src/org/eclipse/jgit/merge/ResolveMerger.java" type="org.eclipse.jgit.merge.ResolveMerger">
<filter id="336658481">
<message_arguments>
<message_argument value="org.eclipse.jgit.merge.ResolveMerger"/>
<message_argument value="workingTreeOptions"/>
</message_arguments>
</filter>
</resource>
<resource path="src/org/eclipse/jgit/storage/pack/PackStatistics.java" type="org.eclipse.jgit.storage.pack.PackStatistics$Accumulator">
<filter id="336658481">
<message_arguments>
<message_argument value="org.eclipse.jgit.storage.pack.PackStatistics.Accumulator"/>
<message_argument value="advertised"/>
</message_arguments>
</filter>
<filter id="336658481">
<message_arguments>
<message_argument value="org.eclipse.jgit.storage.pack.PackStatistics.Accumulator"/>
<message_argument value="haves"/>
</message_arguments>
</filter>
<filter id="336658481">
<message_arguments>
<message_argument value="org.eclipse.jgit.storage.pack.PackStatistics.Accumulator"/>
<message_argument value="timeNegotiating"/>
</message_arguments>
</filter>
<filter id="336658481">
<message_arguments>
<message_argument value="org.eclipse.jgit.storage.pack.PackStatistics.Accumulator"/>
<message_argument value="wants"/>
</message_arguments>
</filter>
</resource>
<resource path="src/org/eclipse/jgit/util/FS.java" type="org.eclipse.jgit.util.FS">
<filter id="1141899266">
<message_arguments>

+ 58
- 60
org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/PackedBatchRefUpdate.java View File

@@ -51,10 +51,10 @@ import static org.eclipse.jgit.transport.ReceiveCommand.Result.REJECTED_OTHER_RE

import java.io.IOException;
import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
@@ -364,65 +364,72 @@ class PackedBatchRefUpdate extends BatchRefUpdate {

private static RefList<Ref> applyUpdates(RevWalk walk, RefList<Ref> refs,
List<ReceiveCommand> commands) throws IOException {
int nDeletes = 0;
List<ReceiveCommand> adds = new ArrayList<>(commands.size());
// Construct a new RefList by merging the old list with the updates.
// This assumes that each ref occurs at most once as a ReceiveCommand.
Collections.sort(commands, new Comparator<ReceiveCommand>() {
@Override
public int compare(ReceiveCommand a, ReceiveCommand b) {
return a.getRefName().compareTo(b.getRefName());
}
});

int delta = 0;
for (ReceiveCommand c : commands) {
if (c.getType() == ReceiveCommand.Type.CREATE) {
adds.add(c);
} else if (c.getType() == ReceiveCommand.Type.DELETE) {
nDeletes++;
switch (c.getType()) {
case DELETE:
delta--;
break;
case CREATE:
delta++;
break;
default:
}
}
int addIdx = 0;

// Construct a new RefList by linearly scanning the old list, and merging in
// any updates.
Map<String, ReceiveCommand> byName = byName(commands);
RefList.Builder<Ref> b =
new RefList.Builder<>(refs.size() - nDeletes + adds.size());
for (Ref ref : refs) {
String name = ref.getName();
ReceiveCommand cmd = byName.remove(name);
if (cmd == null) {
b.add(ref);
continue;
}
if (!cmd.getOldId().equals(ref.getObjectId())) {
lockFailure(cmd, commands);
return null;

RefList.Builder<Ref> b = new RefList.Builder<>(refs.size() + delta);
int refIdx = 0;
int cmdIdx = 0;
while (refIdx < refs.size() || cmdIdx < commands.size()) {
Ref ref = (refIdx < refs.size()) ? refs.get(refIdx) : null;
ReceiveCommand cmd = (cmdIdx < commands.size())
? commands.get(cmdIdx)
: null;
int cmp = 0;
if (ref != null && cmd != null) {
cmp = ref.getName().compareTo(cmd.getRefName());
} else if (ref == null) {
cmp = 1;
} else if (cmd == null) {
cmp = -1;
}

// Consume any adds between the last and current ref.
while (addIdx < adds.size()) {
ReceiveCommand currAdd = adds.get(addIdx);
if (currAdd.getRefName().compareTo(name) < 0) {
b.add(peeledRef(walk, currAdd));
byName.remove(currAdd.getRefName());
} else {
break;
if (cmp < 0) {
b.add(ref);
refIdx++;
} else if (cmp > 0) {
assert cmd != null;
if (cmd.getType() != ReceiveCommand.Type.CREATE) {
lockFailure(cmd, commands);
return null;
}
addIdx++;
}

if (cmd.getType() != ReceiveCommand.Type.DELETE) {
b.add(peeledRef(walk, cmd));
}
}

// All remaining adds are valid, since the refs didn't exist.
while (addIdx < adds.size()) {
ReceiveCommand cmd = adds.get(addIdx++);
byName.remove(cmd.getRefName());
b.add(peeledRef(walk, cmd));
}
cmdIdx++;
} else {
assert cmd != null;
assert ref != null;
if (!cmd.getOldId().equals(ref.getObjectId())) {
lockFailure(cmd, commands);
return null;
}

// Any remaining updates/deletes do not correspond to any existing refs, so
// they are lock failures.
if (!byName.isEmpty()) {
lockFailure(byName.values().iterator().next(), commands);
return null;
if (cmd.getType() != ReceiveCommand.Type.DELETE) {
b.add(peeledRef(walk, cmd));
}
cmdIdx++;
refIdx++;
}
}

return b.toRefList();
}

@@ -501,15 +508,6 @@ class PackedBatchRefUpdate extends BatchRefUpdate {
}
}

private static Map<String, ReceiveCommand> byName(
List<ReceiveCommand> commands) {
Map<String, ReceiveCommand> ret = new LinkedHashMap<>();
for (ReceiveCommand cmd : commands) {
ret.put(cmd.getRefName(), cmd);
}
return ret;
}

private static Ref peeledRef(RevWalk walk, ReceiveCommand cmd)
throws IOException {
ObjectId newId = cmd.getNewId().copy();

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