final DirCache treeO = db.readDirCache();
final DirCache treeT = db.readDirCache();
{
final DirCacheBuilder b = treeB.builder();
final DirCacheBuilder o = treeO.builder();
final DirCacheBuilder t = treeT.builder();
b.add(createEntry("d/o", FileMode.REGULAR_FILE));
b.add(createEntry("d/t", FileMode.REGULAR_FILE));
o.add(createEntry("d/o", FileMode.REGULAR_FILE, "o !"));