Merge branch 'stable-4.8' into stable-4.9

* stable-4.8:
  Prepare 4.7.3-SNAPSHOT builds
  JGit v4.7.2.201807261330-r
  Delete all loose refs empty directories
  Use java.nio to delete path to get detailed errors
  GC: Remove empty references folders
  Do not ignore path deletion errors

Change-Id: I6ab2b951dd94a9fc1c4f5283847a3e2ec37d0895
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

1 files changed, 132 insertions, 0 deletions

diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/GcDeleteEmptyRefsFoldersTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/GcDeleteEmptyRefsFoldersTest.java
new file mode 100644
index 0000000000..b37cd7ae05
--- /dev/null
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/GcDeleteEmptyRefsFoldersTest.java
@@ -0,0 +1,132 @@
+/*
+ * Copyright (C) 2018 Ericsson
+ * 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.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.nio.file.attribute.FileTime;
+import java.time.Instant;
+
+import org.junit.Before;
+import org.junit.Test;
+
+public class GcDeleteEmptyRefsFoldersTest extends GcTestCase {
+	private static final String REF_FOLDER_01 = "A/B/01";
+	private static final String REF_FOLDER_02 = "C/D/02";
+
+	private Path refsDir;
+	private Path heads;
+
+	@Override
+	@Before
+	public void setUp() throws Exception {
+		super.setUp();
+		refsDir = Paths.get(repo.getDirectory().getAbsolutePath())
+				.resolve("refs");
+		heads = refsDir.resolve("heads");
+	}
+
+	@Test
+	public void emptyRefFoldersAreDeleted() throws Exception {
+		FileTime fileTime = FileTime.from(Instant.now().minusSeconds(31));
+		Path refDir01 = Files.createDirectories(heads.resolve(REF_FOLDER_01));
+		Path refDir02 = Files.createDirectories(heads.resolve(REF_FOLDER_02));
+		setLastModifiedTime(fileTime, heads, REF_FOLDER_01);
+		setLastModifiedTime(fileTime, heads, REF_FOLDER_02);
+		assertTrue(refDir01.toFile().exists());
+		assertTrue(refDir02.toFile().exists());
+		gc.gc();
+
+		assertFalse(refDir01.toFile().exists());
+		assertFalse(refDir01.getParent().toFile().exists());
+		assertFalse(refDir01.getParent().getParent().toFile().exists());
+		assertFalse(refDir02.toFile().exists());
+		assertFalse(refDir02.getParent().toFile().exists());
+		assertFalse(refDir02.getParent().getParent().toFile().exists());
+	}
+
+	private void setLastModifiedTime(FileTime fileTime, Path path, String folder) throws IOException {
+		long numParents = folder.chars().filter(c -> c == '/').count();
+		Path folderPath = path.resolve(folder);
+		for(int folderLevel = 0; folderLevel <= numParents; folderLevel ++ ) {
+			Files.setLastModifiedTime(folderPath, fileTime);
+			folderPath = folderPath.getParent();
+		}
+	}
+
+	@Test
+	public void emptyRefFoldersAreKeptIfTheyAreTooRecent()
+			throws Exception {
+		Path refDir01 = Files.createDirectories(heads.resolve(REF_FOLDER_01));
+		Path refDir02 = Files.createDirectories(heads.resolve(REF_FOLDER_02));
+		assertTrue(refDir01.toFile().exists());
+		assertTrue(refDir02.toFile().exists());
+		gc.gc();
+
+		assertTrue(refDir01.toFile().exists());
+		assertTrue(refDir02.toFile().exists());
+	}
+
+	@Test
+	public void nonEmptyRefsFoldersAreKept() throws Exception {
+		Path refDir01 = Files.createDirectories(heads.resolve(REF_FOLDER_01));
+		Path refDir02 = Files.createDirectories(heads.resolve(REF_FOLDER_02));
+		Path ref01 = Files.createFile(refDir01.resolve("ref01"));
+		Path ref02 = Files.createFile(refDir01.resolve("ref02"));
+		assertTrue(refDir01.toFile().exists());
+		assertTrue(refDir02.toFile().exists());
+		assertTrue(ref01.toFile().exists());
+		assertTrue(ref02.toFile().exists());
+		gc.gc();
+		assertTrue(refDir01.toFile().exists());
+		assertTrue(refDir02.toFile().exists());
+		assertTrue(ref01.toFile().exists());
+		assertTrue(ref02.toFile().exists());
+	}
+}