Normalize paths on OS X

Java normalizes paths to NFC, but other source may not, e.g Eclipse.

Bug: 413390
Change-Id: I08649ac58c9b3cb8bf12794703e4137b1b4e94d5
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit.java7/src/org/eclipse/jgit/util/FS_POSIX_Java7.java

@@ -156,4 +156,20 @@ public class FS_POSIX_Java7 extends FS_POSIX {
 	public Attributes getAttributes(File path) {
 		return FileUtil.getFileAttributesPosix(this, path);
 	}
+
+	/**
+	 * @since 3.3
+	 */
+	@Override
+	public File normalize(File file) {
+		return FileUtil.normalize(file);
+	}
+
+	/**
+	 * @since 3.3
+	 */
+	@Override
+	public String normalize(String name) {
+		return FileUtil.normalize(name);
+	}
 }

org.eclipse.jgit.java7/src/org/eclipse/jgit/util/FileUtil.java

@@ -222,4 +222,24 @@ class FileUtil {
 		}
 	}
 
+	public static File normalize(File file) {
+		if (SystemReader.getInstance().isMacOS()) {
+			// TODO: Would it be faster to check with isNormalized first
+			// assuming normalized paths are much more common
+			String normalized = Normalizer.normalize(file.getPath(),
+					Normalizer.Form.NFC);
+			return new File(normalized);
+		}
+		return file;
+	}
+
+	public static String normalize(String name) {
+		if (SystemReader.getInstance().isMacOS()) {
+			if (name == null)
+				return null;
+			return Normalizer.normalize(name, Normalizer.Form.NFC);
+		}
+		return name;
+	}
+
 }

org.eclipse.jgit/src/org/eclipse/jgit/treewalk/FileTreeIterator.java

@@ -163,8 +163,9 @@ public class FileTreeIterator extends WorkingTreeIterator {
 		 * @param fs
 		 *            file system
 		 */
-		public FileEntry(final File f, FS fs) {
+		public FileEntry(File f, FS fs) {
 			this.fs = fs;
+			f = fs.normalize(f);
 			attributes = fs.getAttributes(f);
 			if (attributes.isSymbolicLink())
 				mode = FileMode.SYMLINK;

org.eclipse.jgit/src/org/eclipse/jgit/treewalk/WorkingTreeIterator.java

@@ -921,8 +921,8 @@ public abstract class WorkingTreeIterator extends AbstractTreeIterator {
 			return false;
 		} else {
 			if (mode == FileMode.SYMLINK.getBits())
-				return !new File(readContentAsString(current()))
-						.equals(new File(readContentAsString(entry)));
+				return !new File(readContentAsNormalizedString(current()))
+						.equals(new File((readContentAsNormalizedString(entry))));
 			// Content differs: that's a real change, perhaps
 			if (reader == null) // deprecated use, do no further checks
 				return true;
@@ -971,19 +971,19 @@ public abstract class WorkingTreeIterator extends AbstractTreeIterator {
 		}
 	}
 
-	private String readContentAsString(DirCacheEntry entry)
+	private String readContentAsNormalizedString(DirCacheEntry entry)
 			throws MissingObjectException, IOException {
 		ObjectLoader open = repository.open(entry.getObjectId());
 		byte[] cachedBytes = open.getCachedBytes();
-		return RawParseUtils.decode(cachedBytes);
+		return FS.detect().normalize(RawParseUtils.decode(cachedBytes));
 	}
 
-	private static String readContentAsString(Entry entry) throws IOException {
+	private static String readContentAsNormalizedString(Entry entry) throws IOException {
 		long length = entry.getLength();
 		byte[] content = new byte[(int) length];
 		InputStream is = entry.openInputStream();
 		IO.readFully(is, content, 0, (int) length);
-		return RawParseUtils.decode(content);
+		return FS.detect().normalize(RawParseUtils.decode(content));
 	}
 
 	private long computeLength(InputStream in) throws IOException {

org.eclipse.jgit/src/org/eclipse/jgit/util/FS.java

@@ -780,4 +780,26 @@ public abstract class FS {
 		return new Attributes(this, path, exists, isDirectory, canExecute,
 				isSymlink, isFile, createTime, lastModified, -1);
 	}
+
+	/**
+	 * Normalize the unicode path to composed form.
+	 *
+	 * @param file
+	 * @return NFC-format File
+	 * @since 3.3
+	 */
+	public File normalize(File file) {
+		return file;
+	}
+
+	/**
+	 * Normalize the unicode path to composed form.
+	 *
+	 * @param name
+	 * @return NFC-format string
+	 * @since 3.3
+	 */
+	public String normalize(String name) {
+		return name;
+	}
 }