[issue3099] On windows, "import nul" always succeed

[Tim Golden]

Tim Golden added the comment:

This one seems to have been fixed by the importlib rebuild. I haven't bothered 
to trace the code path, but certainly "import nul" returns the expected 
"ImportError: No module named 'nul'" in both Debug & Release builds.

--
resolution:  -> works for me
stage:  -> committed/rejected
status: open -> closed

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[issue3099] On windows, "import nul" always succeed

[Brett Cannon]

Changes by Brett Cannon :


--
nosy:  -brett.cannon

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[issue3099] On windows, "import nul" always succeed

[Mark Mc Mahon]

Mark Mc Mahon  added the comment:

I am not sure that I fully understand the issue - but it seems that trunk still 
has this issue.
As stated by Amaury - this is on DEBUG builds only.

c:\>pcbuild\python_d.exe
Python 3.3a0 (default, May 28 2011, 20:22:11) [MSC v.1500 32 bit (Intel)] on 
win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import nul
[60967 refs]
>>> import con
^Z
[60986 refs]

c:\>PCbuild\python.exe
Python 3.3a0 (default, May 28 2011, 20:25:13) [MSC v.1500 32 bit (Intel)] on 
win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import nul
Traceback (most recent call last):
  File "", line 1, in 
ImportError: DLL load failed: The parameter is incorrect.
>>> import con
Traceback (most recent call last):
  File "", line 1, in 
ImportError: DLL load failed: The specified module could not be found.
>>>

--
nosy: +markm

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[issue3099] On windows, "import nul" always succeed

[Tim Golden]

Changes by Tim Golden :


--
assignee:  -> tim.golden
nosy: +tim.golden

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[issue3099] On windows, "import nul" always succeed

[Éric Araujo]

Éric Araujo  added the comment:

3.1 does not use importlib for imports.

--
nosy: +merwok

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[issue3099] On windows, "import nul" always succeed

[Terry J. Reedy]

Terry J. Reedy  added the comment:

>it is likely that the new import library will correct the problem.

Did it? 

With standard 3.1.2,
>>> import nul
...
ImportError: DLL load failed: The specified module could not be found.
>>> import con
...
ImportError: No module named con

So is there any problem with 2.7, or should we close this?

--
nosy: +terry.reedy
versions: +Python 2.7 -Python 2.5, Python 2.6, Python 3.0

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[issue3099] On windows, "import nul" always succeed

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc  added the comment:

It's a problem with debug builds on Windows.
Lowering priority. 

Also, it is likely that the new import library will correct the problem.

--
priority:  -> low

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[issue3099] On windows, "import nul" always succeed

[Brett Cannon]

Brett Cannon  added the comment:

Since I don't have access to Windows I am unassigning. Amaury, if this
is still a problem should we go ahead and switch to
GetFileAttributesEx()? Or just realize this is a problem for people
developing Python?

--
assignee: brett.cannon -> 

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[issue3099] On windows, "import nul" always succeed

[Daniel Diniz]

Changes by Daniel Diniz :


--
assignee:  -> brett.cannon
nosy: +brett.cannon

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[issue3099] On windows, "import nul" always succeed

[Hirokazu Yamamoto]

Hirokazu Yamamoto <[EMAIL PROTECTED]> added the comment:

GetFileAttributes() succeeds for "nul", but GetFileAttributesEx() fails.
Maybe is it good idea to use GetFileAttributesEx()?

# test code

import ctypes
import ctypes.wintypes as type

dll = ctypes.windll.kernel32

print dll.GetFileAttributesA("nul") # 32

class WIN32_FILE_ATTRIBUTE_DATA(ctypes.Structure):
_fields_ = [("dwFileAttributes", type.DWORD),
("ftCreationTime", type.FILETIME),
("ftLastAccessTime", type.FILETIME),
("ftLastWriteTime", type.FILETIME),
("nFileSizeHigh", type.DWORD),
("nFileSizeLow", type.DWORD)]

GetFileExInfoStandard = 0

wfad = WIN32_FILE_ATTRIBUTE_DATA()

print dll.GetFileAttributesExA("nul", GetFileExInfoStandard,
ctypes.byref(wfad)) # 0

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[issue3099] On windows, "import nul" always succeed

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <[EMAIL PROTECTED]> added the comment:

OK, I think I got is now. The difference is between debug and release
builds.

Explanation:
- in release build, "import nul" calls stat("nul.pyd") which succeeds.
It then tries LoadLibrary("nul.pyd"), which fails with a DLL error.
- in debug builds, "import nul" first tries stat("nul_d.pyd") which
fails. It then tries stat("nul.py"), which succeeds to return an empty file!

Wh.

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[issue3099] On windows, "import nul" always succeed

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <[EMAIL PROTECTED]> added the comment:

I was wrong. It seems that an installed python works correctly, but a
python running from its build directory has the problem.

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[issue3099] On windows, "import nul" always succeed

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <[EMAIL PROTECTED]> added the comment:

Sorry, I was not clear.
With python 2.5.2, "import nul" correctly raises ImportError, even if
the error message is slightly misleading.

With a recent release25-maint (and all other branches), "import nul"
does succeed, and creates an empty module. 
"import con" seems to block, it actually waits for the user to enter
text and type ^Z. Then it prints to the console some bizarre text that
looks like the content of a .pyc file:

Python 2.5.3a0 (release25-maint, Jun 11 2008, 13:17:36) [MSC v.1200 32
bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import con
^Z
a=1
b=2
c=3
^Z
│≥
c☺   @   s►   d  Z  d☺ Z☺ d☻ S(♥   i☻   i♥   N(☻   t☺   bt☺
  c(((s♠   con.py   ☺   s☻   ♠☺[27520 refs]
>>> dir(con)
['__builtins__', '__doc__', '__file__', '__name__', 'b', 'c']
[27533 refs]

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[issue3099] On windows, "import nul" always succeed

[Georg Brandl]

Georg Brandl <[EMAIL PROTECTED]> added the comment:

The title is misleading -- if what you show is correct then "import nul"
doesn't succeed :)

--
nosy: +georg.brandl

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[issue3099] On windows, "import nul" always succeed

[Amaury Forgeot d'Arc]

New submission from Amaury Forgeot d'Arc <[EMAIL PROTECTED]>:

on Windows, the stat() function always returns True for some special
device names (nul, con, com1, lpt1...), even when followed by an extension.

Thus "import con" manages to find that "con.py" exists, and tries to
read from it... fun.

A solution is to use GetFileAttributes() instead.

Note that on python2.5.2, the error message suggest that we have such a
problem, but fortunately the error is still an ImportError::
  >>> import nul
  ImportError: DLL load failed: Le module spécifié est introuvable.

--
components: Windows
messages: 68115
nosy: amaury.forgeotdarc, ocean-city
severity: normal
status: open
title: On windows, "import nul" always succeed
versions: Python 2.5, Python 2.6, Python 3.0

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