[Zope-dev] Extrenal method unable to run the os.popen() or os.system() commands

Ridzwan Aminuddin wanster at inbox.com
Mon Feb 12 22:41:38 EST 2007


Hi!

Thanks for your reply. Honestly, I'm not sure why the external method is skipped. I've tried several methods to debug and changed my python code to see the effects.


I wrote another Java Jar. called test.jar that when executed prints out a line to stdout and creates a text file to the same directory that the jar is placed in. I placed this jar file as well as the external method python file in the Extensions directory /var/lib/zope2.8/instance/plone-site/Extensions 

This is how the external method looks like:

def runYahooSearch2(self):

	import os

	homedir = os.getcwd()
        # on my machine homedir is /var/lib/zope2.8/instance/plone-site
	command = "java -jar "+ homedir + "/Extensions/test.jar"
	whatisread = os.popen(command).read()
	print whatisread

This external method is triggered in my DTML code. I've created other external methods
before so i know i've done it right.. but the os.system() command for java -jar just
doesn't seem to work. I've tried to use other commands such as "ls" which works perfectly:

	command = "ls"
	whatisread = os.popen(command).read()
	print whatisread

This will sucessfully list out all the files/folders in the working directory.

Its just this java -jar which does not execute at all... I know it doesn't execute at all
cos it doesn't output a file or print the string. If i manually type out into the terminal
:

         java -jar /var/lib/zope2.8/instance/plone-site/Extensions/test.jar

it works perfectly, it prints out the string as well as outputs a text file into the directory the jar file is in.
But using the external method given above just gives me a blank output.

I've also tried popen2:

        from popen2 import popen2
        outputTGT, inputTGT = popen2(command)
        print outputTGT.readline()

and still the jar is simply skipped and not executed.

Is there any other method i can use instead of os.popen os.popen2 and os.system to run this command line
statement?... or any way i can catch the exception which is being thrown when the java
-jar is attempting to run ( if there is any in the firt place) ? Maybe this would help  in the debugging process.

Thanks in advance!

Cheers

Wan



> -----Original Message-----
> From: dieter at handshake.de
> Sent: Mon, 12 Feb 2007 21:24:24 +0100
> To: wanster at inbox.com
> Subject: Re: [Zope-dev] Extrenal method unable to run the os.popen() or
> os.system() commands
> 
> Ridzwan Aminuddin wrote at 2007-2-9 17:53 -0800:
> >Oh yes, i forgot to mention that in my code i did use the absolute paths
> to my java .jar file as you can see i my code below, the absolute path to
> the Extensions directory is in the variable homedir. I also set my
> classpath to point to the folder just in case..
> 
> Relative paths do work -- but, they are (as always) relative to
> the current working directory.
> And unless you (or some buggy extension) have changed it, the
> current working directory will be Zope's instance home.
> 
>> ...
> >homedir = os.getcwd()
> >homedir = homedir + "/Extensions"
>> 
> >command = "cd "+homedir
> >os.popen(command)
> 
> The "popen" above still has no effect. You should remove
> code without effect as it clutters the source.
> 
> >command = "java -jar "+ '"' + homedir + "/" + "ActiveLearningTools.jar"
> + '" ' +
> >"prepArticles >> test.txt"
> >os.popen(command)
> 
> This will look for "ActiveLearningTools.jar" in
> "<instancehome>/Extensions". But the output file "test.txt"
> will be put into "<instancehome>" (as this name is still relative).
> 
> 
> Have you already told us in what way your "ExternalMethod" fails?
> Do you get an exception? Or is simply the output file not produced?
> Or does the output file remain empty?
> 
> 
> 
> --
> Dieter

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