/*
    * Copyright (C) 2010, Stefan Lay <stefan.lay@sap.com>
    * Copyright (C) 2010, Christian Halstrick <christian.halstrick@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.api;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertNotNull;
  import static org.junit.Assert.fail;
  
  import java.io.File;
  import java.io.FileInputStream;
  import java.io.IOException;
  import java.io.PrintWriter;
  
  import org.eclipse.jgit.api.errors.GitAPIException;
  import org.eclipse.jgit.api.errors.NoFilepatternException;
  import org.eclipse.jgit.dircache.DirCache;
  import org.eclipse.jgit.dircache.DirCacheBuilder;
  import org.eclipse.jgit.dircache.DirCacheEntry;
  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.ObjectId;
  import org.eclipse.jgit.lib.ObjectInserter;
  import org.eclipse.jgit.lib.StoredConfig;
  import org.eclipse.jgit.revwalk.RevCommit;
  import org.eclipse.jgit.treewalk.TreeWalk;
  import org.eclipse.jgit.util.FS;
  import org.eclipse.jgit.util.FileUtils;
  import org.junit.Test;
  
  public class AddCommandTest extends RepositoryTestCase {
  
  	@Test
  	public void testAddNothing() throws GitAPIException {
  		Git git = new Git(db);
  
  		try {
  			git.add().call();
  			fail("Expected IllegalArgumentException");
  		} catch (NoFilepatternException e) {
  			// expected
  		}
  
  	}
  
  	@Test
  	public void testAddNonExistingSingleFile() throws GitAPIException {
  		Git git = new Git(db);
  
  		DirCache dc = git.add().addFilepattern("a.txt").call();
  		assertEquals(0, dc.getEntryCount());
  
  	}
  
  	@Test
  	public void testAddExistingSingleFile() throws IOException, GitAPIException {
  		File file = new File(db.getWorkTree(), "a.txt");
 		FileUtils.createNewFile(file);
 		PrintWriter writer = new PrintWriter(file);
 		writer.print("content");
 		writer.close();
 
 		Git git = new Git(db);
 
 		git.add().addFilepattern("a.txt").call();
 
 		assertEquals(
 				"[a.txt, mode:100644, content:content]",
 				indexState(CONTENT));
 	}
 
 	@Test
 	public void testAddExistingSingleSmallFileWithNewLine() throws IOException,
 			GitAPIException {
 		File file = new File(db.getWorkTree(), "a.txt");
 		FileUtils.createNewFile(file);
 		PrintWriter writer = new PrintWriter(file);
 		writer.print("row1\r\nrow2");
 		writer.close();
 
 		Git git = new Git(db);
 		db.getConfig().setString("core", null, "autocrlf", "false");
 		git.add().addFilepattern("a.txt").call();
 		assertEquals("[a.txt, mode:100644, content:row1\r\nrow2]",
 				indexState(CONTENT));
 		db.getConfig().setString("core", null, "autocrlf", "true");
 		git.add().addFilepattern("a.txt").call();
 		assertEquals("[a.txt, mode:100644, content:row1\nrow2]",
 				indexState(CONTENT));
 		db.getConfig().setString("core", null, "autocrlf", "input");
 		git.add().addFilepattern("a.txt").call();
 		assertEquals("[a.txt, mode:100644, content:row1\nrow2]",
 				indexState(CONTENT));
 	}
 
 	@Test
 	public void testAddExistingSingleMediumSizeFileWithNewLine()
 			throws IOException, GitAPIException {
 		File file = new File(db.getWorkTree(), "a.txt");
 		FileUtils.createNewFile(file);
 		StringBuilder data = new StringBuilder();
 		for (int i = 0; i < 1000; ++i) {
 			data.append("row1\r\nrow2");
 		}
 		String crData = data.toString();
 		PrintWriter writer = new PrintWriter(file);
 		writer.print(crData);
 		writer.close();
 		String lfData = data.toString().replaceAll("\r", "");
 		Git git = new Git(db);
 		db.getConfig().setString("core", null, "autocrlf", "false");
 		git.add().addFilepattern("a.txt").call();
 		assertEquals("[a.txt, mode:100644, content:" + data + "]",
 				indexState(CONTENT));
 		db.getConfig().setString("core", null, "autocrlf", "true");
 		git.add().addFilepattern("a.txt").call();
 		assertEquals("[a.txt, mode:100644, content:" + lfData + "]",
 				indexState(CONTENT));
 		db.getConfig().setString("core", null, "autocrlf", "input");
 		git.add().addFilepattern("a.txt").call();
 		assertEquals("[a.txt, mode:100644, content:" + lfData + "]",
 				indexState(CONTENT));
 	}
 
 	@Test
 	public void testAddExistingSingleBinaryFile() throws IOException,
 			GitAPIException {
 		File file = new File(db.getWorkTree(), "a.txt");
 		FileUtils.createNewFile(file);
 		PrintWriter writer = new PrintWriter(file);
 		writer.print("row1\r\nrow2\u0000");
 		writer.close();
 
 		Git git = new Git(db);
 		db.getConfig().setString("core", null, "autocrlf", "false");
 		git.add().addFilepattern("a.txt").call();
 		assertEquals("[a.txt, mode:100644, content:row1\r\nrow2\u0000]",
 				indexState(CONTENT));
 		db.getConfig().setString("core", null, "autocrlf", "true");
 		git.add().addFilepattern("a.txt").call();
 		assertEquals("[a.txt, mode:100644, content:row1\r\nrow2\u0000]",
 				indexState(CONTENT));
 		db.getConfig().setString("core", null, "autocrlf", "input");
 		git.add().addFilepattern("a.txt").call();
 		assertEquals("[a.txt, mode:100644, content:row1\r\nrow2\u0000]",
 				indexState(CONTENT));
 	}
 
 	@Test
 	public void testAddExistingSingleFileInSubDir() throws IOException,
 			GitAPIException {
 		FileUtils.mkdir(new File(db.getWorkTree(), "sub"));
 		File file = new File(db.getWorkTree(), "sub/a.txt");
 		FileUtils.createNewFile(file);
 		PrintWriter writer = new PrintWriter(file);
 		writer.print("content");
 		writer.close();
 
 		Git git = new Git(db);
 
 		git.add().addFilepattern("sub/a.txt").call();
 
 		assertEquals(
 				"[sub/a.txt, mode:100644, content:content]",
 				indexState(CONTENT));
 	}
 
 	@Test
 	public void testAddExistingSingleFileTwice() throws IOException,
 			GitAPIException {
 		File file = new File(db.getWorkTree(), "a.txt");
 		FileUtils.createNewFile(file);
 		PrintWriter writer = new PrintWriter(file);
 		writer.print("content");
 		writer.close();
 
 		Git git = new Git(db);
 		DirCache dc = git.add().addFilepattern("a.txt").call();
 
 		dc.getEntry(0).getObjectId();
 
 		writer = new PrintWriter(file);
 		writer.print("other content");
 		writer.close();
 
 		dc = git.add().addFilepattern("a.txt").call();
 
 		assertEquals(
 				"[a.txt, mode:100644, content:other content]",
 				indexState(CONTENT));
 	}
 
 	@Test
 	public void testAddExistingSingleFileTwiceWithCommit() throws Exception {
 		File file = new File(db.getWorkTree(), "a.txt");
 		FileUtils.createNewFile(file);
 		PrintWriter writer = new PrintWriter(file);
 		writer.print("content");
 		writer.close();
 
 		Git git = new Git(db);
 		DirCache dc = git.add().addFilepattern("a.txt").call();
 
 		dc.getEntry(0).getObjectId();
 
 		git.commit().setMessage("commit a.txt").call();
 
 		writer = new PrintWriter(file);
 		writer.print("other content");
 		writer.close();
 
 		dc = git.add().addFilepattern("a.txt").call();
 
 		assertEquals(
 				"[a.txt, mode:100644, content:other content]",
 				indexState(CONTENT));
 	}
 
 	@Test
 	public void testAddRemovedFile() throws Exception {
 		File file = new File(db.getWorkTree(), "a.txt");
 		FileUtils.createNewFile(file);
 		PrintWriter writer = new PrintWriter(file);
 		writer.print("content");
 		writer.close();
 
 		Git git = new Git(db);
 		DirCache dc = git.add().addFilepattern("a.txt").call();
 
 		dc.getEntry(0).getObjectId();
 		FileUtils.delete(file);
 
 		// is supposed to do nothing
 		dc = git.add().addFilepattern("a.txt").call();
 
 		assertEquals(
 				"[a.txt, mode:100644, content:content]",
 				indexState(CONTENT));
 	}
 
 	@Test
 	public void testAddRemovedCommittedFile() throws Exception {
 		File file = new File(db.getWorkTree(), "a.txt");
 		FileUtils.createNewFile(file);
 		PrintWriter writer = new PrintWriter(file);
 		writer.print("content");
 		writer.close();
 
 		Git git = new Git(db);
 		DirCache dc = git.add().addFilepattern("a.txt").call();
 
 		git.commit().setMessage("commit a.txt").call();
 
 		dc.getEntry(0).getObjectId();
 		FileUtils.delete(file);
 
 		// is supposed to do nothing
 		dc = git.add().addFilepattern("a.txt").call();
 
 		assertEquals(
 				"[a.txt, mode:100644, content:content]",
 				indexState(CONTENT));
 	}
 
 	@Test
 	public void testAddWithConflicts() throws Exception {
 		// prepare conflict
 
 		File file = new File(db.getWorkTree(), "a.txt");
 		FileUtils.createNewFile(file);
 		PrintWriter writer = new PrintWriter(file);
 		writer.print("content");
 		writer.close();
 
 		File file2 = new File(db.getWorkTree(), "b.txt");
 		FileUtils.createNewFile(file2);
 		writer = new PrintWriter(file2);
 		writer.print("content b");
 		writer.close();
 
 		ObjectInserter newObjectInserter = db.newObjectInserter();
 		DirCache dc = db.lockDirCache();
 		DirCacheBuilder builder = dc.builder();
 
 		addEntryToBuilder("b.txt", file2, newObjectInserter, builder, 0);
 		addEntryToBuilder("a.txt", file, newObjectInserter, builder, 1);
 
 		writer = new PrintWriter(file);
 		writer.print("other content");
 		writer.close();
 		addEntryToBuilder("a.txt", file, newObjectInserter, builder, 3);
 
 		writer = new PrintWriter(file);
 		writer.print("our content");
 		writer.close();
 		addEntryToBuilder("a.txt", file, newObjectInserter, builder, 2)
 				.getObjectId();
 
 		builder.commit();
 
 		assertEquals(
 				"[a.txt, mode:100644, stage:1, content:content]" +
 				"[a.txt, mode:100644, stage:2, content:our content]" +
 				"[a.txt, mode:100644, stage:3, content:other content]" +
 				"[b.txt, mode:100644, content:content b]",
 				indexState(CONTENT));
 
 		// now the test begins
 
 		Git git = new Git(db);
 		dc = git.add().addFilepattern("a.txt").call();
 
 		assertEquals(
 				"[a.txt, mode:100644, content:our content]" +
 				"[b.txt, mode:100644, content:content b]",
 				indexState(CONTENT));
 	}
 
 	@Test
 	public void testAddTwoFiles() throws Exception  {
 		File file = new File(db.getWorkTree(), "a.txt");
 		FileUtils.createNewFile(file);
 		PrintWriter writer = new PrintWriter(file);
 		writer.print("content");
 		writer.close();
 
 		File file2 = new File(db.getWorkTree(), "b.txt");
 		FileUtils.createNewFile(file2);
 		writer = new PrintWriter(file2);
 		writer.print("content b");
 		writer.close();
 
 		Git git = new Git(db);
 		git.add().addFilepattern("a.txt").addFilepattern("b.txt").call();
 		assertEquals(
 				"[a.txt, mode:100644, content:content]" +
 				"[b.txt, mode:100644, content:content b]",
 				indexState(CONTENT));
 	}
 
 	@Test
 	public void testAddFolder() throws Exception  {
 		FileUtils.mkdir(new File(db.getWorkTree(), "sub"));
 		File file = new File(db.getWorkTree(), "sub/a.txt");
 		FileUtils.createNewFile(file);
 		PrintWriter writer = new PrintWriter(file);
 		writer.print("content");
 		writer.close();
 
 		File file2 = new File(db.getWorkTree(), "sub/b.txt");
 		FileUtils.createNewFile(file2);
 		writer = new PrintWriter(file2);
 		writer.print("content b");
 		writer.close();
 
 		Git git = new Git(db);
 		git.add().addFilepattern("sub").call();
 		assertEquals(
 				"[sub/a.txt, mode:100644, content:content]" +
 				"[sub/b.txt, mode:100644, content:content b]",
 				indexState(CONTENT));
 	}
 
 	@Test
 	public void testAddIgnoredFile() throws Exception  {
 		FileUtils.mkdir(new File(db.getWorkTree(), "sub"));
 		File file = new File(db.getWorkTree(), "sub/a.txt");
 		FileUtils.createNewFile(file);
 		PrintWriter writer = new PrintWriter(file);
 		writer.print("content");
 		writer.close();
 
 		File ignoreFile = new File(db.getWorkTree(), ".gitignore");
 		FileUtils.createNewFile(ignoreFile);
 		writer = new PrintWriter(ignoreFile);
 		writer.print("sub/b.txt");
 		writer.close();
 
 		File file2 = new File(db.getWorkTree(), "sub/b.txt");
 		FileUtils.createNewFile(file2);
 		writer = new PrintWriter(file2);
 		writer.print("content b");
 		writer.close();
 
 		Git git = new Git(db);
 		git.add().addFilepattern("sub").call();
 
 		assertEquals(
 				"[sub/a.txt, mode:100644, content:content]",
 				indexState(CONTENT));
 	}
 
 	@Test
 	public void testAddWholeRepo() throws Exception  {
 		FileUtils.mkdir(new File(db.getWorkTree(), "sub"));
 		File file = new File(db.getWorkTree(), "sub/a.txt");
 		FileUtils.createNewFile(file);
 		PrintWriter writer = new PrintWriter(file);
 		writer.print("content");
 		writer.close();
 
 		File file2 = new File(db.getWorkTree(), "sub/b.txt");
 		FileUtils.createNewFile(file2);
 		writer = new PrintWriter(file2);
 		writer.print("content b");
 		writer.close();
 
 		Git git = new Git(db);
 		git.add().addFilepattern(".").call();
 		assertEquals(
 				"[sub/a.txt, mode:100644, content:content]" +
 				"[sub/b.txt, mode:100644, content:content b]",
 				indexState(CONTENT));
 	}
 
 	// the same three cases as in testAddWithParameterUpdate
 	// file a exists in workdir and in index -> added
 	// file b exists not in workdir but in index -> unchanged
 	// file c exists in workdir but not in index -> added
 	@Test
 	public void testAddWithoutParameterUpdate() throws Exception {
 		FileUtils.mkdir(new File(db.getWorkTree(), "sub"));
 		File file = new File(db.getWorkTree(), "sub/a.txt");
 		FileUtils.createNewFile(file);
 		PrintWriter writer = new PrintWriter(file);
 		writer.print("content");
 		writer.close();
 
 		File file2 = new File(db.getWorkTree(), "sub/b.txt");
 		FileUtils.createNewFile(file2);
 		writer = new PrintWriter(file2);
 		writer.print("content b");
 		writer.close();
 
 		Git git = new Git(db);
 		git.add().addFilepattern("sub").call();
 
 		assertEquals(
 				"[sub/a.txt, mode:100644, content:content]" +
 				"[sub/b.txt, mode:100644, content:content b]",
 				indexState(CONTENT));
 
 		git.commit().setMessage("commit").call();
 
 		// new unstaged file sub/c.txt
 		File file3 = new File(db.getWorkTree(), "sub/c.txt");
 		FileUtils.createNewFile(file3);
 		writer = new PrintWriter(file3);
 		writer.print("content c");
 		writer.close();
 
 		// file sub/a.txt is modified
 		writer = new PrintWriter(file);
 		writer.print("modified content");
 		writer.close();
 
 		// file sub/b.txt is deleted
 		FileUtils.delete(file2);
 
 		git.add().addFilepattern("sub").call();
 		// change in sub/a.txt is staged
 		// deletion of sub/b.txt is not staged
 		// sub/c.txt is staged
 		assertEquals(
 				"[sub/a.txt, mode:100644, content:modified content]" +
 				"[sub/b.txt, mode:100644, content:content b]" +
 				"[sub/c.txt, mode:100644, content:content c]",
 				indexState(CONTENT));
 	}
 
 	// file a exists in workdir and in index -> added
 	// file b exists not in workdir but in index -> deleted
 	// file c exists in workdir but not in index -> unchanged
 	@Test
 	public void testAddWithParameterUpdate() throws Exception {
 		FileUtils.mkdir(new File(db.getWorkTree(), "sub"));
 		File file = new File(db.getWorkTree(), "sub/a.txt");
 		FileUtils.createNewFile(file);
 		PrintWriter writer = new PrintWriter(file);
 		writer.print("content");
 		writer.close();
 
 		File file2 = new File(db.getWorkTree(), "sub/b.txt");
 		FileUtils.createNewFile(file2);
 		writer = new PrintWriter(file2);
 		writer.print("content b");
 		writer.close();
 
 		Git git = new Git(db);
 		git.add().addFilepattern("sub").call();
 
 		assertEquals(
 				"[sub/a.txt, mode:100644, content:content]" +
 				"[sub/b.txt, mode:100644, content:content b]",
 				indexState(CONTENT));
 
 		git.commit().setMessage("commit").call();
 
 		// new unstaged file sub/c.txt
 		File file3 = new File(db.getWorkTree(), "sub/c.txt");
 		FileUtils.createNewFile(file3);
 		writer = new PrintWriter(file3);
 		writer.print("content c");
 		writer.close();
 
 		// file sub/a.txt is modified
 		writer = new PrintWriter(file);
 		writer.print("modified content");
 		writer.close();
 
 		FileUtils.delete(file2);
 
 		// change in sub/a.txt is staged
 		// deletion of sub/b.txt is staged
 		// sub/c.txt is not staged
 		git.add().addFilepattern("sub").setUpdate(true).call();
 		// change in sub/a.txt is staged
 		assertEquals(
 				"[sub/a.txt, mode:100644, content:modified content]",
 				indexState(CONTENT));
 	}
 
 	@Test
 	public void testAssumeUnchanged() throws Exception {
 		Git git = new Git(db);
 		String path = "a.txt";
 		writeTrashFile(path, "content");
 		git.add().addFilepattern(path).call();
 		String path2 = "b.txt";
 		writeTrashFile(path2, "content");
 		git.add().addFilepattern(path2).call();
 		git.commit().setMessage("commit").call();
 		assertEquals("[a.txt, mode:100644, content:"
 				+ "content, assume-unchanged:false]"
 				+ "[b.txt, mode:100644, content:content, "
 				+ "assume-unchanged:false]", indexState(CONTENT
 				| ASSUME_UNCHANGED));
 		assumeUnchanged(path2);
 		assertEquals("[a.txt, mode:100644, content:content, "
 				+ "assume-unchanged:false][b.txt, mode:100644, "
 				+ "content:content, assume-unchanged:true]", indexState(CONTENT
 				| ASSUME_UNCHANGED));
 		writeTrashFile(path, "more content");
 		writeTrashFile(path2, "more content");
 
 		git.add().addFilepattern(".").call();
 
 		assertEquals("[a.txt, mode:100644, content:more content,"
 				+ " assume-unchanged:false][b.txt, mode:100644,"
  + "" + ""
 				+ " content:content, assume-unchanged:true]",
 				indexState(CONTENT
 				| ASSUME_UNCHANGED));
 	}
 
 	@Test
 	public void testExecutableRetention() throws Exception {
 		StoredConfig config = db.getConfig();
 		config.setBoolean(ConfigConstants.CONFIG_CORE_SECTION, null,
 				ConfigConstants.CONFIG_KEY_FILEMODE, true);
 		config.save();
 
 		FS executableFs = new FS() {
 
 			public boolean supportsExecute() {
 				return true;
 			}
 
 			public boolean setExecute(File f, boolean canExec) {
 				return true;
 			}
 
 			public ProcessBuilder runInShell(String cmd, String[] args) {
 				return null;
 			}
 
 			public boolean retryFailedLockFileCommit() {
 				return false;
 			}
 
 			public FS newInstance() {
 				return this;
 			}
 
 			protected File discoverGitExe() {
 				return null;
 			}
 
 			public boolean canExecute(File f) {
 				return true;
 			}
 
 			@Override
 			public boolean isCaseSensitive() {
 				return false;
 			}
 		};
 
 		Git git = Git.open(db.getDirectory(), executableFs);
 		String path = "a.txt";
 		writeTrashFile(path, "content");
 		git.add().addFilepattern(path).call();
 		RevCommit commit1 = git.commit().setMessage("commit").call();
 		TreeWalk walk = TreeWalk.forPath(db, path, commit1.getTree());
 		assertNotNull(walk);
 		assertEquals(FileMode.EXECUTABLE_FILE, walk.getFileMode(0));
 
 		FS nonExecutableFs = new FS() {
 
 			public boolean supportsExecute() {
 				return false;
 			}
 
 			public boolean setExecute(File f, boolean canExec) {
 				return false;
 			}
 
 			public ProcessBuilder runInShell(String cmd, String[] args) {
 				return null;
 			}
 
 			public boolean retryFailedLockFileCommit() {
 				return false;
 			}
 
 			public FS newInstance() {
 				return this;
 			}
 
 			protected File discoverGitExe() {
 				return null;
 			}
 
 			public boolean canExecute(File f) {
 				return false;
 			}
 
 			@Override
 			public boolean isCaseSensitive() {
 				return false;
 			}
 		};
 
 		config = db.getConfig();
 		config.setBoolean(ConfigConstants.CONFIG_CORE_SECTION, null,
 				ConfigConstants.CONFIG_KEY_FILEMODE, false);
 		config.save();
 
 		Git git2 = Git.open(db.getDirectory(), nonExecutableFs);
 		writeTrashFile(path, "content2");
 		git2.add().addFilepattern(path).call();
 		RevCommit commit2 = git2.commit().setMessage("commit2").call();
 		walk = TreeWalk.forPath(db, path, commit2.getTree());
 		assertNotNull(walk);
 		assertEquals(FileMode.EXECUTABLE_FILE, walk.getFileMode(0));
 	}
 
 	private static DirCacheEntry addEntryToBuilder(String path, File file,
 			ObjectInserter newObjectInserter, DirCacheBuilder builder, int stage)
 			throws IOException {
 		FileInputStream inputStream = new FileInputStream(file);
 		ObjectId id = newObjectInserter.insert(
 				Constants.OBJ_BLOB, file.length(), inputStream);
 		inputStream.close();
 		DirCacheEntry entry = new DirCacheEntry(path, stage);
 		entry.setObjectId(id);
 		entry.setFileMode(FileMode.REGULAR_FILE);
 		entry.setLastModified(file.lastModified());
 		entry.setLength((int) file.length());
 
 		builder.add(entry);
 		return entry;
 	}
 
 	private void assumeUnchanged(String path) throws IOException {
 		final DirCache dirc = db.lockDirCache();
 		final DirCacheEntry ent = dirc.getEntry(path);
 		if (ent != null)
 			ent.setAssumeValid(true);
 		dirc.write();
 		if (!dirc.commit())
 			throw new IOException("could not commit");
 	}
 
 }