Make tarfile raise ImportError on MacOS9. The pathname handling needs work, and I don't have time to fix it. I'll file a bug report.

Lib/tarfile.py

@@ -50,6 +50,13 @@ import errno
 import time
 import struct
 
+if sys.platform == 'mac':
+    # This module needs work for MacOS9, especially in the area of pathname
+    # handling. In many places it is assumed a simple substitution of / by the
+    # local os.path.sep is good enough to convert pathnames, but this does not
+    # work with the mac rooted:path:name versus :nonrooted:path:name syntax
+    raise ImportError, "tarfile does not work for platform==mac"
+
 try:
     import grp, pwd
 except ImportError: