[PLUG-Devel] python exec probs

[Paul Hahn]

It works for me when I try it. If the execute permission is not set,
errno returned 13 Permission denied.

If it was not there, errno 2 "file does not exist".

To get it to return 8 requires me to go into the shell script and
comment out the magic sharp bang line. Then it does not know how to
execute it and then I get the same error you get.

On Thu, Mar 25, 2010 at 2:47 PM, Darrin Chandler
<dwchandler at stilyagin.com> wrote:
> Hans!
>
> On Thu, Mar 25, 2010 at 02:33:59PM -0700, der.hans wrote:
>> moin moin,
>>
>> I don't speak python, but I need to get something simple done via python.
>>
>> Currently I'm trying to pass an argument to an external program and
>> capture the output.
>>
>> I'm running Ubuntu 9.10 with python 2.6, but will be deploying on CentOS
>> with python 2.4.
>>
>> Apparently the subprocess module was introduced in 2.4 and is replacing
>> all other mechanims for this.
>>
>> http://docs.python.org/library/subprocess.html
>>
>> $ cat /var/tmp/test.py
>> #!/usr/bin/python
>>
>> import subprocess as sub
>>
>> # shell_cmd = "/var/tmp/test.sh"
>> # file='/var/tmp/file.txt'
>>
>> # p = sub.Popen( [shell_cmd, file], stdout=sub.PIPE )
>> p = sub.Popen(["/var/tmp/test.sh", "/var/tmp/file.txt"], stdout=sub.PIPE)
>> output = p.communicate()[0]
>
> This looks correct. Exec format error sounds like /var/tmp/test.sh
> either isn't marked executable or it's not actually a shell script or
> something. Does "/var/tmp/test.sh /var/tmp/file.txt" work at the shell
> prompt?
>
>>
>> # print "%(output)d output" % { 'output': output }
>> $ /var/tmp/test.py
>> Traceback (most recent call last):
>>   File "/var/tmp/test.py", line 9, in <module>
>>     p = sub.Popen(["/var/tmp/test.sh", "/var/tmp/file.txt"],
>> stdout=sub.PIPE)
>>   File "/usr/lib/python2.6/subprocess.py", line 621, in __init__
>>     errread, errwrite)
>>   File "/usr/lib/python2.6/subprocess.py", line 1126, in _execute_child
>>     raise child_exception
>> OSError: [Errno 8] Exec format error
>> $ ls -l /var/tmp/test.sh -rwxr-xr-x 1 lufthans lufthans 268
>> 2010-03-25 14:13 /var/tmp/test.sh
>> $ /var/tmp/test.sh 2112
>>
>> If I leave the square brackets off the command and file I get an error
>> about bufsize not being an integer. If I leave the brackets off and remove
>> the argument I still get the Exec format error.
>>
>> How can I fix my code to get this working?
>>
>> ciao,
>>
>> der.hans
>> --
>> #  http://www.LuftHans.com/Classes        http://www.TwoGeekTechs.com/
>> #  Director of Engineering, FonWallet Transaction Solutions, Inc.
>> #  "If your girlfriend is crying crocodile tears it's because she's either
>> #  got salt in her eye or she's been listening to Air Supply."
>> #    -- Alice Cooper, 08Mar2005
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>
> --
> Darrin Chandler            |  Phoenix BSD User Group  |  MetaBUG
> dwchandler at stilyagin.com   |  http://phxbug.org/      |  http://metabug.org/
> http://www.stilyagin.com/  |  Daemons in the Desert   |  Global BUG Federation
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