Merge "Do not rely on filemode differences in case of symbolic links"

org.eclipse.jgit.test/tst/org/eclipse/jgit/treewalk/FileTreeIteratorTest.java

@@ -46,6 +46,9 @@ package org.eclipse.jgit.treewalk;
 import java.io.File;
 import java.security.MessageDigest;
 
+import org.eclipse.jgit.api.Git;
+import org.eclipse.jgit.dircache.DirCacheCheckout;
+import org.eclipse.jgit.dircache.DirCacheEntry;
 import org.eclipse.jgit.lib.Constants;
 import org.eclipse.jgit.lib.FileMode;
 import org.eclipse.jgit.lib.ObjectId;
@@ -175,6 +178,24 @@ public class FileTreeIteratorTest extends RepositoryTestCase {
 		assertEquals(expect, top.getEntryObjectId());
 	}
 
+	public void testIsModifiedSymlink() throws Exception {
+		File f = writeTrashFile("symlink", "content");
+		Git git = new Git(db);
+		git.add().addFilepattern("symlink").call();
+		git.commit().setMessage("commit").call();
+
+		// Modify previously committed DirCacheEntry and write it back to disk
+		DirCacheEntry dce = db.readDirCache().getEntry("symlink");
+		dce.setFileMode(FileMode.SYMLINK);
+		DirCacheCheckout.checkoutEntry(db, f, dce);
+
+		FileTreeIterator fti = new FileTreeIterator(trash, db.getFS(), db
+				.getConfig().get(WorkingTreeOptions.KEY));
+		while (!fti.getEntryPathString().equals("symlink"))
+			fti.next(1);
+		assertFalse(fti.isModified(dce, false));
+	}
+
 	private static String nameOf(final AbstractTreeIterator i) {
 		return RawParseUtils.decode(Constants.CHARSET, i.path, 0, i.pathLen);
 	}

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

@@ -556,15 +556,19 @@ public abstract class WorkingTreeIterator extends AbstractTreeIterator {
 		// bitwise presentation of modeDiff we'll have a '1' when the two modes
 		// differ at this position.
 		int modeDiff = getEntryRawMode() ^ entry.getRawMode();
-		// Ignore the executable file bits if checkFilemode tells me to do so.
+
-		// Ignoring is done by setting the bits representing a EXECUTABLE_FILE
+		// Do not rely on filemode differences in case of symbolic links
-		// to '0' in modeDiff
+		if (modeDiff != 0 && !FileMode.SYMLINK.equals(entry.getRawMode())) {
+			// Ignore the executable file bits if WorkingTreeOptions tell me to
+			// do so. Ignoring is done by setting the bits representing a
+			// EXECUTABLE_FILE to '0' in modeDiff
 			if (!state.options.isFileMode())
 				modeDiff &= ~FileMode.EXECUTABLE_FILE.getBits();
 			if (modeDiff != 0)
 				// Report a modification if the modes still (after potentially
 				// ignoring EXECUTABLE_FILE bits) differ
 				return true;
+		}
 
 		// Git under windows only stores seconds so we round the timestamp
 		// Java gives us if it looks like the timestamp in index is seconds