diff -r 0dbcf3c9ff20 -r 91c9fd6a7c70 mercurial/hg.py
--- a/mercurial/hg.py	Thu Jun 09 08:53:07 2005 +0100
+++ b/mercurial/hg.py	Thu Jun 09 09:24:08 2005 +0100
@@ -18,7 +18,12 @@
     s = os.stat(f).st_mode
     if (s & 0100 != 0) == mode:
         return
-    os.chmod(f, s & 0666 | (mode * 0111))
+    if mode:
+        umask = os.umask(0)
+        os.umask(umask)
+        os.chmod(f, s | (s & 0444) >> 2 & ~umask)
+    else:
+        os.chmod(f, s & 0666)
 
 class filelog(revlog):
     def __init__(self, opener, path):