Exempt lib2to3 pickled grammars from the DirectorySandboxing. Fixes #121.

--HG--
extra : histedit_source : 6cd9a3c6003d3f6de2f8e676b61589db4dffafb0

CHANGES.txt

@@ -6,6 +6,7 @@ CHANGES
 2.0
 ---
 
+* Issue #121: Exempt lib2to3 pickled grammars from DirectorySandbox.
 * Issue #41: Dropped support for Python 2.4 and Python 2.5. Clients requiring
   setuptools for those versions of Python should use setuptools 1.x.
 * Removed ``setuptools.command.easy_install.HAS_USER_SITE``. Clients

setuptools/sandbox.py

@@ -199,8 +199,11 @@ class DirectorySandbox(AbstractSandbox):
         "utime", "lchown", "chroot", "mkfifo", "mknod", "tempnam",
     ])
 
-    _exception_patterns = []
-    "allow writing to paths that match the pattern"
+    _exception_patterns = [
+        # Allow lib2to3 to attempt to save a pickled grammar object (#121)
+        '.*lib2to3.*\.pickle$',
+    ]
+    "exempt writing to paths that match the pattern"
 
     def __init__(self, sandbox, exceptions=_EXCEPTIONS):
         self._sandbox = os.path.normcase(os.path.realpath(sandbox))