new file mode 100644
--- /dev/null
+++ b/mercurial/osutil.py
@@ -0,0 +1,37 @@
+import os, stat
+
+def _mode_to_kind(mode):
+    if stat.S_ISREG(mode): return stat.S_IFREG
+    if stat.S_ISDIR(mode): return stat.S_IFDIR
+    if stat.S_ISLNK(mode): return stat.S_IFLNK
+    if stat.S_ISBLK(mode): return stat.S_IFBLK
+    if stat.S_ISCHR(mode): return stat.S_IFCHR
+    if stat.S_ISFIFO(mode): return stat.S_IFIFO
+    if stat.S_ISSOCK(mode): return stat.S_IFSOCK
+    return mode
+
+def listdir(path, stat=False):
+    '''listdir(path, stat=False) -> list_of_tuples
+
+    Return a sorted list containing information about the entries
+    in the directory.
+
+    If stat is True, each element is a 3-tuple:
+
+      (name, type, stat object)
+
+    Otherwise, each element is a 2-tuple:
+
+      (name, type)
+    '''
+    result = []
+    prefix = path + os.sep
+    names = os.listdir(path)
+    names.sort()
+    for fn in names:
+        st = os.lstat(prefix + fn)
+        if stat:
+            result.append((fn, _mode_to_kind(st.st_mode), st))
+        else:
+            result.append((fn, _mode_to_kind(st.st_mode)))
+    return result