[Python-Dev] is this a bug? no environment variables (original) (raw)

Glenn Linderman v+python at g.nevcal.com
Tue Nov 23 11:30:31 CET 2010

On 11/22/2010 8:33 AM, Guido van Rossum wrote:

On Sun, Nov 21, 2010 at 9:40 PM, Glenn Linderman<v+python at g.nevcal.com> wrote:

> In reviewing my notes from my experimentations with CGIHTTPServer > (Python2.6) and then http.server (Python 3.2a4), I note one behavior I > haven't reported as a bug, nor do I know where to start to figure it out, > other than experimentally. > > The experiment: launching CGIHTTPServer without environment variables, by > the simple expedient of using a batch file to unset all the existing > environment variables, and then launching Python2.6 with CGIHTTPServer. > > So it failed early: random.py fails at line 110 (Python 2.6). What specific traceback do you get? In my copy of the code that line says a = long(hexlify(urandom(16)), 16) and I could just imagine that urandom() fails for some reason to do with the environment (it is a reference to os.urandom()), which, being part of the C library code, might depend on the environment. But you're not giving enough info to debug this.

OK, here is the traceback. I've upgraded the application from Python 2.6 + CGIHTTPServer.py + bugfixes to Python 3.2a4 + http.server + bugfixes, hoping that it would fix it, but since it didn't that the traceback would be more relevant. It seems that _urandom is the likely culprit.

Traceback (most recent call last): File "d:\my\web\areliabl\0test\https.py", line 5, in import server File "d:\my\web\areliabl\0test\server.py", line 88, in import email.message File "C:\Python32\lib\email\message.py", line 17, in from email import utils File "C:\Python32\lib\email\utils.py", line 27, in import random File "C:\Python32\lib\random.py", line 698, in _inst = Random() File "C:\Python32\lib\random.py", line 90, in init self.seed(x) File "C:\Python32\lib\random.py", line 108, in seed a = int.from_bytes(_urandom(32), 'big') WindowsError: [Error -2146893818] Invalid Signature -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.python.org/pipermail/python-dev/attachments/20101123/0e18c030/attachment.html>

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