Browse Source
* stable-5.3: Prepare 5.3.3-SNAPSHOT builds JGit v5.3.2.201906051522-r Prepare 5.1.9-SNAPSHOT builds JGit v5.1.8.201906050907-r Test detecting modified packfiles Enhance fsTick() to use filesystem timer resolution Add debug trace to measure time needed to open pack index Extend FileSnapshot for packfiles to also use checksum to detect changes Wait opening new packfile until it can't be racy anymore Avoid null PackConfig in GC Add FileSnapshot test testing recognition of file size changes Capture reason for result of FileSnapshot#isModified Skip FileSnapshotTest#testSimulatePackfileReplacement on Windows Tune max heap size for tests Fix FileSnapshotTest.testNewFileNoWait() to match its javadoc ObjectDirectory: fix closing of obsolete packs Update API filters for methods added to fix bugs Bazel: Increase severity of most error-prone checks to ERROR Enable error-prone checks by default Add bazel options to align with gerrit's Include filekey file attribute when comparing FileSnapshots Measure file timestamp resolution used in FileSnapshot Fix FileSnapshot's consideration of file size Fix API problem filters Fix API problem filters Change-Id: Ie1c7e4752661aec9e1754660934921224e2408eb Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>stable-5.4
Matthias Sohn
6 years ago
18 changed files with 1201 additions and 120 deletions
@ -0,0 +1,9 @@ |
|||||||
|
build --repository_cache=~/.gerritcodereview/bazel-cache/repository |
||||||
|
build --experimental_strict_action_env |
||||||
|
build --action_env=PATH |
||||||
|
build --disk_cache=~/.gerritcodereview/bazel-cache/cas |
||||||
|
build --java_toolchain //tools:error_prone_warnings_toolchain |
||||||
|
|
||||||
|
test --build_tests_only |
||||||
|
test --test_output=errors |
||||||
|
|
||||||
@ -0,0 +1,354 @@ |
|||||||
|
/* |
||||||
|
* Copyright (C) 2019, Matthias Sohn <matthias.sohn@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.internal.storage.file; |
||||||
|
|
||||||
|
import static org.junit.Assert.assertEquals; |
||||||
|
import static org.junit.Assert.assertFalse; |
||||||
|
import static org.junit.Assert.assertTrue; |
||||||
|
import static org.junit.Assume.assumeFalse; |
||||||
|
import static org.junit.Assume.assumeTrue; |
||||||
|
|
||||||
|
import java.io.File; |
||||||
|
import java.io.IOException; |
||||||
|
import java.io.OutputStream; |
||||||
|
import java.io.Writer; |
||||||
|
import java.nio.file.Files; |
||||||
|
import java.nio.file.Path; |
||||||
|
import java.nio.file.Paths; |
||||||
|
import java.nio.file.StandardCopyOption; |
||||||
|
import java.nio.file.StandardOpenOption; |
||||||
|
//import java.nio.file.attribute.BasicFileAttributes;
|
||||||
|
import java.text.ParseException; |
||||||
|
import java.util.Collection; |
||||||
|
import java.util.Iterator; |
||||||
|
import java.util.Random; |
||||||
|
import java.util.zip.Deflater; |
||||||
|
|
||||||
|
import org.eclipse.jgit.api.GarbageCollectCommand; |
||||||
|
import org.eclipse.jgit.api.Git; |
||||||
|
import org.eclipse.jgit.api.errors.AbortedByHookException; |
||||||
|
import org.eclipse.jgit.api.errors.ConcurrentRefUpdateException; |
||||||
|
import org.eclipse.jgit.api.errors.GitAPIException; |
||||||
|
import org.eclipse.jgit.api.errors.NoFilepatternException; |
||||||
|
import org.eclipse.jgit.api.errors.NoHeadException; |
||||||
|
import org.eclipse.jgit.api.errors.NoMessageException; |
||||||
|
import org.eclipse.jgit.api.errors.UnmergedPathsException; |
||||||
|
import org.eclipse.jgit.api.errors.WrongRepositoryStateException; |
||||||
|
import org.eclipse.jgit.junit.RepositoryTestCase; |
||||||
|
import org.eclipse.jgit.lib.AnyObjectId; |
||||||
|
import org.eclipse.jgit.lib.ConfigConstants; |
||||||
|
import org.eclipse.jgit.lib.ObjectId; |
||||||
|
import org.eclipse.jgit.storage.file.FileBasedConfig; |
||||||
|
import org.eclipse.jgit.storage.pack.PackConfig; |
||||||
|
import org.junit.Test; |
||||||
|
|
||||||
|
public class PackFileSnapshotTest extends RepositoryTestCase { |
||||||
|
|
||||||
|
private static ObjectId unknownID = ObjectId |
||||||
|
.fromString("1234567890123456789012345678901234567890"); |
||||||
|
|
||||||
|
@Test |
||||||
|
public void testSamePackDifferentCompressionDetectChecksumChanged() |
||||||
|
throws Exception { |
||||||
|
Git git = Git.wrap(db); |
||||||
|
File f = writeTrashFile("file", "foobar "); |
||||||
|
for (int i = 0; i < 10; i++) { |
||||||
|
appendRandomLine(f); |
||||||
|
git.add().addFilepattern("file").call(); |
||||||
|
git.commit().setMessage("message" + i).call(); |
||||||
|
} |
||||||
|
|
||||||
|
FileBasedConfig c = db.getConfig(); |
||||||
|
c.setInt(ConfigConstants.CONFIG_GC_SECTION, null, |
||||||
|
ConfigConstants.CONFIG_KEY_AUTOPACKLIMIT, 1); |
||||||
|
c.save(); |
||||||
|
Collection<PackFile> packs = gc(Deflater.NO_COMPRESSION); |
||||||
|
assertEquals("expected 1 packfile after gc", 1, packs.size()); |
||||||
|
PackFile p1 = packs.iterator().next(); |
||||||
|
PackFileSnapshot snapshot = p1.getFileSnapshot(); |
||||||
|
|
||||||
|
packs = gc(Deflater.BEST_COMPRESSION); |
||||||
|
assertEquals("expected 1 packfile after gc", 1, packs.size()); |
||||||
|
PackFile p2 = packs.iterator().next(); |
||||||
|
File pf = p2.getPackFile(); |
||||||
|
|
||||||
|
// changing compression level with aggressive gc may change size,
|
||||||
|
// fileKey (on *nix) and checksum. Hence FileSnapshot.isModified can
|
||||||
|
// return true already based on size or fileKey.
|
||||||
|
// So the only thing we can test here is that we ensure that checksum
|
||||||
|
// also changed when we read it here in this test
|
||||||
|
assertTrue("expected snapshot to detect modified pack", |
||||||
|
snapshot.isModified(pf)); |
||||||
|
assertTrue("expected checksum changed", snapshot.isChecksumChanged(pf)); |
||||||
|
} |
||||||
|
|
||||||
|
private void appendRandomLine(File f, int length, Random r) |
||||||
|
throws IOException { |
||||||
|
try (Writer w = Files.newBufferedWriter(f.toPath(), |
||||||
|
StandardOpenOption.APPEND)) { |
||||||
|
appendRandomLine(w, length, r); |
||||||
|
} |
||||||
|
} |
||||||
|
|
||||||
|
private void appendRandomLine(File f) throws IOException { |
||||||
|
appendRandomLine(f, 5, new Random()); |
||||||
|
} |
||||||
|
|
||||||
|
private void appendRandomLine(Writer w, int len, Random r) |
||||||
|
throws IOException { |
||||||
|
final int c1 = 32; // ' '
|
||||||
|
int c2 = 126; // '~'
|
||||||
|
for (int i = 0; i < len; i++) { |
||||||
|
w.append((char) (c1 + r.nextInt(1 + c2 - c1))); |
||||||
|
} |
||||||
|
} |
||||||
|
|
||||||
|
private ObjectId createTestRepo(int testDataSeed, int testDataLength) |
||||||
|
throws IOException, GitAPIException, NoFilepatternException, |
||||||
|
NoHeadException, NoMessageException, UnmergedPathsException, |
||||||
|
ConcurrentRefUpdateException, WrongRepositoryStateException, |
||||||
|
AbortedByHookException { |
||||||
|
// Create a repo with two commits and one file. Each commit adds
|
||||||
|
// testDataLength number of bytes. Data are random bytes. Since the
|
||||||
|
// seed for the random number generator is specified we will get
|
||||||
|
// the same set of bytes for every run and for every platform
|
||||||
|
Random r = new Random(testDataSeed); |
||||||
|
Git git = Git.wrap(db); |
||||||
|
File f = writeTrashFile("file", "foobar "); |
||||||
|
appendRandomLine(f, testDataLength, r); |
||||||
|
git.add().addFilepattern("file").call(); |
||||||
|
git.commit().setMessage("message1").call(); |
||||||
|
appendRandomLine(f, testDataLength, r); |
||||||
|
git.add().addFilepattern("file").call(); |
||||||
|
return git.commit().setMessage("message2").call().getId(); |
||||||
|
} |
||||||
|
|
||||||
|
// Try repacking so fast that you get two new packs which differ only in
|
||||||
|
// content/chksum but have same name, size and lastmodified.
|
||||||
|
// Since this is done with standard gc (which creates new tmp files and
|
||||||
|
// renames them) the filekeys of the new packfiles differ helping jgit
|
||||||
|
// to detect the fast modification
|
||||||
|
@Test |
||||||
|
public void testDetectModificationAlthoughSameSizeAndModificationtime() |
||||||
|
throws Exception { |
||||||
|
int testDataSeed = 1; |
||||||
|
int testDataLength = 100; |
||||||
|
FileBasedConfig config = db.getConfig(); |
||||||
|
// don't use mtime of the parent folder to detect pack file
|
||||||
|
// modification.
|
||||||
|
config.setBoolean(ConfigConstants.CONFIG_CORE_SECTION, null, |
||||||
|
ConfigConstants.CONFIG_KEY_TRUSTFOLDERSTAT, false); |
||||||
|
config.save(); |
||||||
|
|
||||||
|
createTestRepo(testDataSeed, testDataLength); |
||||||
|
|
||||||
|
// repack to create initial packfile
|
||||||
|
PackFile pf = repackAndCheck(5, null, null, null); |
||||||
|
Path packFilePath = pf.getPackFile().toPath(); |
||||||
|
AnyObjectId chk1 = pf.getPackChecksum(); |
||||||
|
String name = pf.getPackName(); |
||||||
|
Long length = Long.valueOf(pf.getPackFile().length()); |
||||||
|
long m1 = packFilePath.toFile().lastModified(); |
||||||
|
|
||||||
|
// Wait for a filesystem timer tick to enhance probability the rest of
|
||||||
|
// this test is done before the filesystem timer ticks again.
|
||||||
|
fsTick(packFilePath.toFile()); |
||||||
|
|
||||||
|
// Repack to create packfile with same name, length. Lastmodified and
|
||||||
|
// content and checksum are different since compression level differs
|
||||||
|
AnyObjectId chk2 = repackAndCheck(6, name, length, chk1) |
||||||
|
.getPackChecksum(); |
||||||
|
long m2 = packFilePath.toFile().lastModified(); |
||||||
|
assumeFalse(m2 == m1); |
||||||
|
|
||||||
|
// Repack to create packfile with same name, length. Lastmodified is
|
||||||
|
// equal to the previous one because we are in the same filesystem timer
|
||||||
|
// slot. Content and its checksum are different
|
||||||
|
AnyObjectId chk3 = repackAndCheck(7, name, length, chk2) |
||||||
|
.getPackChecksum(); |
||||||
|
long m3 = packFilePath.toFile().lastModified(); |
||||||
|
|
||||||
|
// ask for an unknown git object to force jgit to rescan the list of
|
||||||
|
// available packs. If we would ask for a known objectid then JGit would
|
||||||
|
// skip searching for new/modified packfiles
|
||||||
|
db.getObjectDatabase().has(unknownID); |
||||||
|
assertEquals(chk3, getSinglePack(db.getObjectDatabase().getPacks()) |
||||||
|
.getPackChecksum()); |
||||||
|
assumeTrue(m3 == m2); |
||||||
|
} |
||||||
|
|
||||||
|
// Try repacking so fast that we get two new packs which differ only in
|
||||||
|
// content and checksum but have same name, size and lastmodified.
|
||||||
|
// To avoid that JGit detects modification by checking the filekey create
|
||||||
|
// two new packfiles upfront and create copies of them. Then modify the
|
||||||
|
// packfiles in-place by opening them for write and then copying the
|
||||||
|
// content.
|
||||||
|
@Test |
||||||
|
public void testDetectModificationAlthoughSameSizeAndModificationtimeAndFileKey() |
||||||
|
throws Exception { |
||||||
|
int testDataSeed = 1; |
||||||
|
int testDataLength = 100; |
||||||
|
FileBasedConfig config = db.getConfig(); |
||||||
|
config.setBoolean(ConfigConstants.CONFIG_CORE_SECTION, null, |
||||||
|
ConfigConstants.CONFIG_KEY_TRUSTFOLDERSTAT, false); |
||||||
|
config.save(); |
||||||
|
|
||||||
|
createTestRepo(testDataSeed, testDataLength); |
||||||
|
|
||||||
|
// Repack to create initial packfile. Make a copy of it
|
||||||
|
PackFile pf = repackAndCheck(5, null, null, null); |
||||||
|
Path packFilePath = pf.getPackFile().toPath(); |
||||||
|
Path packFileBasePath = packFilePath.resolveSibling( |
||||||
|
packFilePath.getFileName().toString().replaceAll(".pack", "")); |
||||||
|
AnyObjectId chk1 = pf.getPackChecksum(); |
||||||
|
String name = pf.getPackName(); |
||||||
|
Long length = Long.valueOf(pf.getPackFile().length()); |
||||||
|
copyPack(packFileBasePath, "", ".copy1"); |
||||||
|
|
||||||
|
// Repack to create second packfile. Make a copy of it
|
||||||
|
AnyObjectId chk2 = repackAndCheck(6, name, length, chk1) |
||||||
|
.getPackChecksum(); |
||||||
|
copyPack(packFileBasePath, "", ".copy2"); |
||||||
|
|
||||||
|
// Repack to create third packfile
|
||||||
|
AnyObjectId chk3 = repackAndCheck(7, name, length, chk2) |
||||||
|
.getPackChecksum(); |
||||||
|
long m3 = packFilePath.toFile().lastModified(); |
||||||
|
db.getObjectDatabase().has(unknownID); |
||||||
|
assertEquals(chk3, getSinglePack(db.getObjectDatabase().getPacks()) |
||||||
|
.getPackChecksum()); |
||||||
|
|
||||||
|
// Wait for a filesystem timer tick to enhance probability the rest of
|
||||||
|
// this test is done before the filesystem timer ticks.
|
||||||
|
fsTick(packFilePath.toFile()); |
||||||
|
|
||||||
|
// Copy copy2 to packfile data to force modification of packfile without
|
||||||
|
// changing the packfile's filekey.
|
||||||
|
copyPack(packFileBasePath, ".copy2", ""); |
||||||
|
long m2 = packFilePath.toFile().lastModified(); |
||||||
|
assumeFalse(m3 == m2); |
||||||
|
|
||||||
|
db.getObjectDatabase().has(unknownID); |
||||||
|
assertEquals(chk2, getSinglePack(db.getObjectDatabase().getPacks()) |
||||||
|
.getPackChecksum()); |
||||||
|
|
||||||
|
// Copy copy2 to packfile data to force modification of packfile without
|
||||||
|
// changing the packfile's filekey.
|
||||||
|
copyPack(packFileBasePath, ".copy1", ""); |
||||||
|
long m1 = packFilePath.toFile().lastModified(); |
||||||
|
assumeTrue(m2 == m1); |
||||||
|
db.getObjectDatabase().has(unknownID); |
||||||
|
assertEquals(chk1, getSinglePack(db.getObjectDatabase().getPacks()) |
||||||
|
.getPackChecksum()); |
||||||
|
} |
||||||
|
|
||||||
|
// Copy file from src to dst but avoid creating a new File (with new
|
||||||
|
// FileKey) if dst already exists
|
||||||
|
private Path copyFile(Path src, Path dst) throws IOException { |
||||||
|
if (Files.exists(dst)) { |
||||||
|
dst.toFile().setWritable(true); |
||||||
|
try (OutputStream dstOut = Files.newOutputStream(dst)) { |
||||||
|
Files.copy(src, dstOut); |
||||||
|
return dst; |
||||||
|
} |
||||||
|
} else { |
||||||
|
return Files.copy(src, dst, StandardCopyOption.REPLACE_EXISTING); |
||||||
|
} |
||||||
|
} |
||||||
|
|
||||||
|
private Path copyPack(Path base, String srcSuffix, String dstSuffix) |
||||||
|
throws IOException { |
||||||
|
copyFile(Paths.get(base + ".idx" + srcSuffix), |
||||||
|
Paths.get(base + ".idx" + dstSuffix)); |
||||||
|
copyFile(Paths.get(base + ".bitmap" + srcSuffix), |
||||||
|
Paths.get(base + ".bitmap" + dstSuffix)); |
||||||
|
return copyFile(Paths.get(base + ".pack" + srcSuffix), |
||||||
|
Paths.get(base + ".pack" + dstSuffix)); |
||||||
|
} |
||||||
|
|
||||||
|
private PackFile repackAndCheck(int compressionLevel, String oldName, |
||||||
|
Long oldLength, AnyObjectId oldChkSum) |
||||||
|
throws IOException, ParseException { |
||||||
|
PackFile p = getSinglePack(gc(compressionLevel)); |
||||||
|
File pf = p.getPackFile(); |
||||||
|
// The following two assumptions should not cause the test to fail. If
|
||||||
|
// on a certain platform we get packfiles (containing the same git
|
||||||
|
// objects) where the lengths differ or the checksums don't differ we
|
||||||
|
// just skip this test. A reason for that could be that compression
|
||||||
|
// works differently or random number generator works differently. Then
|
||||||
|
// we have to search for more consistent test data or checkin these
|
||||||
|
// packfiles as test resources
|
||||||
|
assumeTrue(oldLength == null || pf.length() == oldLength.longValue()); |
||||||
|
assumeTrue(oldChkSum == null || !p.getPackChecksum().equals(oldChkSum)); |
||||||
|
assertTrue(oldName == null || p.getPackName().equals(oldName)); |
||||||
|
return p; |
||||||
|
} |
||||||
|
|
||||||
|
private PackFile getSinglePack(Collection<PackFile> packs) { |
||||||
|
Iterator<PackFile> pIt = packs.iterator(); |
||||||
|
PackFile p = pIt.next(); |
||||||
|
assertFalse(pIt.hasNext()); |
||||||
|
return p; |
||||||
|
} |
||||||
|
|
||||||
|
private Collection<PackFile> gc(int compressionLevel) |
||||||
|
throws IOException, ParseException { |
||||||
|
GC gc = new GC(db); |
||||||
|
PackConfig pc = new PackConfig(db.getConfig()); |
||||||
|
pc.setCompressionLevel(compressionLevel); |
||||||
|
|
||||||
|
pc.setSinglePack(true); |
||||||
|
|
||||||
|
// --aggressive
|
||||||
|
pc.setDeltaSearchWindowSize( |
||||||
|
GarbageCollectCommand.DEFAULT_GC_AGGRESSIVE_WINDOW); |
||||||
|
pc.setMaxDeltaDepth(GarbageCollectCommand.DEFAULT_GC_AGGRESSIVE_DEPTH); |
||||||
|
pc.setReuseObjects(false); |
||||||
|
|
||||||
|
gc.setPackConfig(pc); |
||||||
|
gc.setExpireAgeMillis(0); |
||||||
|
gc.setPackExpireAgeMillis(0); |
||||||
|
return gc.gc(); |
||||||
|
} |
||||||
|
|
||||||
|
} |
||||||
@ -0,0 +1,123 @@ |
|||||||
|
/* |
||||||
|
* Copyright (C) 2019, Matthias Sohn <matthias.sohn@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.internal.storage.file; |
||||||
|
|
||||||
|
import java.io.File; |
||||||
|
import java.io.IOException; |
||||||
|
import java.io.RandomAccessFile; |
||||||
|
|
||||||
|
import org.eclipse.jgit.lib.AnyObjectId; |
||||||
|
import org.eclipse.jgit.lib.ObjectId; |
||||||
|
|
||||||
|
class PackFileSnapshot extends FileSnapshot { |
||||||
|
|
||||||
|
private static final ObjectId MISSING_CHECKSUM = ObjectId.zeroId(); |
||||||
|
|
||||||
|
/** |
||||||
|
* Record a snapshot for a specific packfile path. |
||||||
|
* <p> |
||||||
|
* This method should be invoked before the packfile is accessed. |
||||||
|
* |
||||||
|
* @param path |
||||||
|
* the path to later remember. The path's current status |
||||||
|
* information is saved. |
||||||
|
* @return the snapshot. |
||||||
|
*/ |
||||||
|
public static PackFileSnapshot save(File path) { |
||||||
|
return new PackFileSnapshot(path); |
||||||
|
} |
||||||
|
|
||||||
|
private AnyObjectId checksum = MISSING_CHECKSUM; |
||||||
|
|
||||||
|
private boolean wasChecksumChanged; |
||||||
|
|
||||||
|
|
||||||
|
PackFileSnapshot(File packFile) { |
||||||
|
super(packFile); |
||||||
|
} |
||||||
|
|
||||||
|
void setChecksum(AnyObjectId checksum) { |
||||||
|
this.checksum = checksum; |
||||||
|
} |
||||||
|
|
||||||
|
/** {@inheritDoc} */ |
||||||
|
@Override |
||||||
|
public boolean isModified(File packFile) { |
||||||
|
if (!super.isModified(packFile)) { |
||||||
|
return false; |
||||||
|
} |
||||||
|
if (wasSizeChanged() || wasFileKeyChanged() |
||||||
|
|| !wasLastModifiedRacilyClean()) { |
||||||
|
return true; |
||||||
|
} |
||||||
|
return isChecksumChanged(packFile); |
||||||
|
} |
||||||
|
|
||||||
|
boolean isChecksumChanged(File packFile) { |
||||||
|
return wasChecksumChanged = checksum != MISSING_CHECKSUM |
||||||
|
&& !checksum.equals(readChecksum(packFile)); |
||||||
|
} |
||||||
|
|
||||||
|
private AnyObjectId readChecksum(File packFile) { |
||||||
|
try (RandomAccessFile fd = new RandomAccessFile(packFile, "r")) { //$NON-NLS-1$
|
||||||
|
fd.seek(fd.length() - 20); |
||||||
|
final byte[] buf = new byte[20]; |
||||||
|
fd.readFully(buf, 0, 20); |
||||||
|
return ObjectId.fromRaw(buf); |
||||||
|
} catch (IOException e) { |
||||||
|
return MISSING_CHECKSUM; |
||||||
|
} |
||||||
|
} |
||||||
|
|
||||||
|
boolean wasChecksumChanged() { |
||||||
|
return wasChecksumChanged; |
||||||
|
} |
||||||
|
|
||||||
|
@SuppressWarnings("nls") |
||||||
|
@Override |
||||||
|
public String toString() { |
||||||
|
return "PackFileSnapshot [checksum=" + checksum + ", " |
||||||
|
+ super.toString() + "]"; |
||||||
|
} |
||||||
|
|
||||||
|
} |
||||||
Loading…
Reference in new issue