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-rw-r--r--org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/GcDeleteEmptyRefsFoldersTest.java118
-rw-r--r--org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/GC.java46
2 files changed, 164 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..76e1534c59
--- /dev/null
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/GcDeleteEmptyRefsFoldersTest.java
@@ -0,0 +1,118 @@
+/*
+ * 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.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 = "01";
+ private static final String REF_FOLDER_02 = "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.createDirectory(heads.resolve(REF_FOLDER_01));
+ Path refDir02 = Files.createDirectory(heads.resolve(REF_FOLDER_02));
+ Files.setLastModifiedTime(refDir01, fileTime);
+ Files.setLastModifiedTime(refDir02, fileTime);
+ assertTrue(refDir01.toFile().exists());
+ assertTrue(refDir02.toFile().exists());
+ gc.gc();
+
+ assertFalse(refDir01.toFile().exists());
+ assertFalse(refDir02.toFile().exists());
+ }
+
+ @Test
+ public void emptyRefFoldersAreKeptIfTheyAreTooRecent()
+ throws Exception {
+ Path refDir01 = Files.createDirectory(heads.resolve(REF_FOLDER_01));
+ Path refDir02 = Files.createDirectory(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.createDirectory(heads.resolve(REF_FOLDER_01));
+ Path refDir02 = Files.createDirectory(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());
+ }
+}
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/GC.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/GC.java
index e1b309da64..55d0751247 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/GC.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/GC.java
@@ -61,6 +61,8 @@ import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;
import java.text.MessageFormat;
import java.text.ParseException;
+import java.time.Instant;
+import java.time.temporal.ChronoUnit;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
@@ -865,6 +867,7 @@ public class GC {
throw new IOException(e);
}
prunePacked();
+ deleteEmptyRefsFolders();
deleteOrphans();
lastPackedRefs = refsBefore;
@@ -880,6 +883,49 @@ public class GC {
return ref.getName().startsWith(Constants.R_TAGS);
}
+ private void deleteEmptyRefsFolders() throws IOException {
+ Path refs = repo.getDirectory().toPath().resolve("refs"); //$NON-NLS-1$
+ try (Stream<Path> entries = Files.list(refs)) {
+ Iterator<Path> iterator = entries.iterator();
+ while (iterator.hasNext()) {
+ try (Stream<Path> s = Files.list(iterator.next())) {
+ s.forEach(this::deleteDir);
+ }
+ }
+ }
+ }
+
+ private void deleteDir(Path dir) {
+ try (Stream<Path> dirs = Files.walk(dir)) {
+ dirs.filter(this::isDirectory).sorted(Comparator.reverseOrder())
+ .forEach(this::delete);
+ } catch (IOException e) {
+ LOG.error(e.getMessage(), e);
+ }
+ }
+
+ private boolean isDirectory(Path p) {
+ return p.toFile().isDirectory();
+ }
+
+ private boolean delete(Path d) {
+ try {
+ // Avoid deleting a folder that was just created so that concurrent
+ // operations trying to create a reference are not impacted
+ Instant threshold = Instant.now().minus(30, ChronoUnit.SECONDS);
+ Instant lastModified = Files.getLastModifiedTime(d).toInstant();
+ if (lastModified.isBefore(threshold)) {
+ // If the folder is not empty, the delete operation will fail
+ // silently. This is a cheaper alternative to filtering the
+ // stream in the calling method.
+ return d.toFile().delete();
+ }
+ } catch (IOException e) {
+ LOG.error(e.getMessage(), e);
+ }
+ return false;
+ }
+
/**
* Deletes orphans
* <p>

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