python: disable exit handler to rw history file

oe-core adds a exit handler to rw python command history file
(~/.python-history). There are no allow rules for every user&role
to use create/read/write ~/.python-history, and it is also
improper to add rules because these rules would blow up the
user&role's scope of authority.

So disable the handler, if selinux enabled.

Signed-off-by: Xin Ouyang <Xin.Ouyang@windriver.com>

recipes-devtools/python/python/sitecustomize.py

@@ -0,0 +1,26 @@
+# OpenEmbedded sitecustomize.py (C) 2002-2008 Michael 'Mickey' Lauer <mlauer@vanille-media.de>
+# GPLv2 or later
+# Version: 20081123
+# Features:
+# * set proper default encoding
+# Features removed for SELinux:
+# * enable readline completion in the interactive interpreter
+# * load command line history on startup
+# * save command line history on exit 
+
+import os
+
+def __enableDefaultEncoding():
+    import sys
+    try:
+        sys.setdefaultencoding( "utf8" )
+    except LookupError:
+        pass
+
+import sys
+try:
+    import rlcompleter, readline
+except ImportError:
+    pass
+else:
+    __enableDefaultEncoding()

recipes-devtools/python/python_2.7.2.bbappend

@@ -0,0 +1,5 @@
+PR .= ".1"
+
+inherit selinux
+# If selinux enabled, disable handlers to rw command history file
+FILESEXTRAPATHS_prepend := "${@target_selinux(d, '${THISDIR}/${PN}:')}"