[ python-Bugs-1180160 ] subprocess.Popen fails with closed stdout

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Bugs item #1180160, was opened at 2005-04-10 13:41
Message generated for change (Comment added) made by astrand
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Category: Python Library
Group: Python 2.4
>Status: Closed
>Resolution: Invalid
Priority: 5
Submitted By: neuhauser (neuhauser)
Assigned to: Peter Åstrand (astrand)
Summary: subprocess.Popen fails with closed stdout

Initial Comment:
I have a piece of code that gets run in a script that
has its stdout closed:                                
                                        

    import sys
    sys.stdout = sys.stderr

    c = subprocess.Popen (...,
                          stdin  = subprocess.PIPE,
                          stdout = subprocess.PIPE,
                          stderr = subprocess.STDOUT) 
                         

and this is what I get:

Sending        SVNR/permissions
Transmitting file data .svn: Commit failed (details
follow):                    
svn: 'pre-commit' hook failed with error output:      
                         
Traceback (most recent call last):
  (...)
  File ".../__init__.py", line 40, in run
    stderr = subprocess.STDOUT)                       
                         
  File "/usr/local/lib/python2.4/subprocess.py", line
554, in __init__
    errread, errwrite)
  File "/usr/local/lib/python2.4/subprocess.py", line
986, in _execute_child
    raise child_exception
OSError: [Errno 2] No such file or directory          
                         

This is the child_traceback:

  File "/usr/local/lib/python2.4/subprocess.py", line
955, in _execute_child
  File "/usr/local/lib/python2.4/os.py", line 341, in
execvp                    
  File "/usr/local/lib/python2.4/os.py", line 379, in
_execvpe                  
    func(fullname, *argrest)
OSError: [Errno 2] No such file or directory          
                         

http://docs.python.org/lib/node230.html claims that
"PIPE indicates that a new pipe to the child should be
created" which doesn't seem to be the case.

Subversion code that runs the script can be seen at   
                         
http://svn.collab.net/viewcvs/svn/trunk/subversion/libsvn_repos/hooks.c
       
(run_hook_cmd()).


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>Comment By: Peter Åstrand (astrand)
Date: 2005-06-23 18:05

Message:
Logged In: YES 
user_id=344921

No response in over 2 months. Closing. 

----------------------------------------------------------------------

Comment By: Peter Åstrand (astrand)
Date: 2005-04-14 21:26

Message:
Logged In: YES 
user_id=344921

I can't se anything in your report that indicates that a
closed stdout is the problem. execvp() says "No such file or
directory", which means that the file you are trying to
execute doesn't exist. Do you have any reason to believe
that this error message is not true?

It would help if you could give me a working *Python*
example, indicating the problem. The source
http://svn.collab.net/viewcvs/svn/trunk/subversion/libsvn_repos/hooks.c
is written in C, not Python...



----------------------------------------------------------------------

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