using subprocess module in Python CGI

[Chris Rebert]

On Mon, Dec 22, 2008 at 2:02 AM, ANURAG BAGARIA
<anurag.bagaria at gmail.com> wrote:
> Hello,
>
> I am a Python Newbie and would like to call a short python script via
> browser using a CGI script, but initially I am trying to call the same
> python script directly through python command line. The script intends to
> perform a few command line in a pipe and I have written the script (a short
> one) as follows.
>
> #!/usr/bin/python
>
> import cgi, string, os, sys, cgitb, commands, subprocess
> import posixpath, macpath
> #file = "x.tar.gz"
> #comd = "tar -xf %s" % (file)
> #os.system(comd)
> #commands.getoutput('tar -xf x.tar.gz | cd demo; cp README ../')
> comd = [\
>         "tar -xf x.tar.gz", \
>         "cd demo", \
>         "cp README ../", \
>       ]
> outFile = os.path.join(os.curdir, "output.log")
> outptr = file(outFile, "w")
> errFile = os.path.join(os.curdir, "error.log")
> errptr = file(errFile, "w")
> retval = subprocess.call(comd, 0, None, None, outptr, errptr)
> errptr.close()
> outptr.close()
> if not retval == 0:
>         errptr = file(errFile, "r")
>         errData = errptr.read()
>         errptr.close()
>         raise Exception("Error executing command: " + repr(errData))
>
>
> but after trying to execute this independently, I get the following error
> which I am unable to interpret :
>
> Traceback (most recent call last):
>   File "process.py", line 18, in <module>
>     retval = subprocess.call(comd, 0, None, None, outptr, errptr)
>   File "/usr/lib/python2.5/subprocess.py", line 443, in call
>     return Popen(*popenargs, **kwargs).wait()
>   File "/usr/lib/python2.5/subprocess.py", line 593, in __init__
>     errread, errwrite)
>   File "/usr/lib/python2.5/subprocess.py", line 1135, in _execute_child
>     raise child_exception

There should be at least one more line in this traceback, and that
line is the most important one.
People will need that line to help you with your problem.

Cheers,
Chris

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