Add pack-refs command to the CLI

This command can be used to optimize storage of references.

For a RefDirectory database, it packs non-symbolic, loose refs into
packed-refs. By default, only the references under '$GIT_DIR/refs/tags'
are packed. The '--all' option can be used to pack all the references
under '$GIT_DIR/refs'.

For Reftable, all refs are compacted into a single table.

Change-Id: I92e786403f8638d35ae3037844a7ad89e8959e02

1 files changed, 81 insertions, 0 deletions

diff --git a/org.eclipse.jgit.pgm.test/tst/org/eclipse/jgit/pgm/PackRefsTest.java b/org.eclipse.jgit.pgm.test/tst/org/eclipse/jgit/pgm/PackRefsTest.java
new file mode 100644
index 0000000000..b4d4ea9e56
--- /dev/null
+++ b/org.eclipse.jgit.pgm.test/tst/org/eclipse/jgit/pgm/PackRefsTest.java
@@ -0,0 +1,81 @@
+/*
+ * Copyright (c) 2024 Qualcomm Innovation Center, Inc.
+ * 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 v. 1.0 which is available at
+ * https://www.eclipse.org/org/documents/edl-v10.php.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+package org.eclipse.jgit.pgm;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
+
+import java.io.File;
+
+import org.eclipse.jgit.api.Git;
+import org.eclipse.jgit.internal.storage.file.FileRepository;
+import org.eclipse.jgit.lib.CLIRepositoryTestCase;
+import org.eclipse.jgit.lib.ConfigConstants;
+import org.eclipse.jgit.lib.Constants;
+import org.eclipse.jgit.lib.Ref;
+import org.junit.Before;
+import org.junit.Test;
+
+public class PackRefsTest extends CLIRepositoryTestCase {
+	private Git git;
+
+	@Override
+	@Before
+	public void setUp() throws Exception {
+		super.setUp();
+		git = new Git(db);
+		git.commit().setMessage("initial commit").call();
+	}
+
+	@Test
+	public void tagPacked() throws Exception {
+		git.tag().setName("test").call();
+		git.packRefs().call();
+		assertEquals(Ref.Storage.PACKED,
+				git.getRepository().exactRef("refs/tags/test").getStorage());
+	}
+
+	@Test
+	public void nonTagRefNotPackedWithoutAll() throws Exception {
+		git.branchCreate().setName("test").call();
+		git.packRefs().call();
+		assertEquals(Ref.Storage.LOOSE,
+				git.getRepository().exactRef("refs/heads/test").getStorage());
+	}
+
+	@Test
+	public void nonTagRefPackedWithAll() throws Exception {
+		git.branchCreate().setName("test").call();
+		git.packRefs().setAll(true).call();
+		assertEquals(Ref.Storage.PACKED,
+				git.getRepository().exactRef("refs/heads/test").getStorage());
+	}
+
+	@Test
+	public void refTableCompacted() throws Exception {
+		((FileRepository) git.getRepository()).convertRefStorage(
+				ConfigConstants.CONFIG_REF_STORAGE_REFTABLE, false, false);
+
+		git.commit().setMessage("test commit").call();
+		File tableDir = new File(db.getDirectory(), Constants.REFTABLE);
+		File[] reftables = tableDir.listFiles();
+		assertNotNull(reftables);
+		assertTrue(reftables.length > 2);
+
+		git.packRefs().call();
+
+		reftables = tableDir.listFiles();
+		assertNotNull(reftables);
+		assertEquals(2, reftables.length);
+	}
+}