From 23b9693a75b899c97da8a04c0b531874b225d236 Mon Sep 17 00:00:00 2001
From: Matthias Sohn <matthias.sohn@sap.com>
Date: Mon, 27 Mar 2023 22:23:11 +0200
Subject: DirCache: support option index.skipHash

Support the new option index.skipHash which was introduced in git 2.40
[1]. If it is set to true skip computing the git index checksum. This
accelerates Git commands that manipulate the index, such as git add, git
commit, or git status. Instead of storing the checksum, write a trailing
set of bytes with value zero, indicating that the computation was
skipped.

Accept a skipped checksum consisting of 20 null bytes when reading the
index since the option could have been set to true at the time when the
index was written.

[1] https://git-scm.com/docs/git-config#Documentation/git-config.txt-indexskipHash

Bug: 581723
Change-Id: I28ebe44c5ca1cbcb882438665d686452a0c111b2
---
 .../eclipse/jgit/dircache/DirCacheBasicTest.java   | 29 ++++++++++++++++++++++
 1 file changed, 29 insertions(+)

(limited to 'org.eclipse.jgit.test')

diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/dircache/DirCacheBasicTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/dircache/DirCacheBasicTest.java
index 0fca652906..618ccc0a0c 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/dircache/DirCacheBasicTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/dircache/DirCacheBasicTest.java
@@ -17,19 +17,48 @@ import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
 
 import java.io.File;
+import java.io.IOException;
 import java.text.MessageFormat;
+import java.util.Arrays;
+import java.util.Collection;
 
 import org.eclipse.jgit.errors.CorruptObjectException;
 import org.eclipse.jgit.internal.JGitText;
 import org.eclipse.jgit.junit.MockSystemReader;
 import org.eclipse.jgit.junit.RepositoryTestCase;
+import org.eclipse.jgit.lib.ConfigConstants;
 import org.eclipse.jgit.lib.Constants;
 import org.eclipse.jgit.lib.FileMode;
 import org.eclipse.jgit.lib.ObjectInserter;
+import org.eclipse.jgit.storage.file.FileBasedConfig;
 import org.eclipse.jgit.util.SystemReader;
+import org.junit.Before;
 import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+import org.junit.runners.Parameterized.Parameter;
+import org.junit.runners.Parameterized.Parameters;
 
+@RunWith(Parameterized.class)
 public class DirCacheBasicTest extends RepositoryTestCase {
+	@Parameter(0)
+	public boolean skipHash;
+
+	@Parameters(name = "skipHash: {0}")
+	public static Collection<Boolean[]> getSkipHashValues() {
+		return Arrays
+				.asList(new Boolean[][] { { Boolean.TRUE },
+						{ Boolean.FALSE } });
+	}
+
+	@Before
+	public void setup() throws IOException {
+		FileBasedConfig cfg = db.getConfig();
+		cfg.setBoolean(ConfigConstants.CONFIG_INDEX_SECTION, null,
+				ConfigConstants.CONFIG_KEY_SKIPHASH, skipHash);
+		cfg.save();
+	}
+
 	@Test
 	public void testReadMissing_RealIndex() throws Exception {
 		final File idx = new File(db.getDirectory(), "index");
-- 
cgit v1.2.3