# [mod_python] process privileges

 Khormaee, Cy cy.khormaee at hp.com Mon Sep 12 11:10:06 EDT 2005 Previous message: [mod_python] Persistent web-service Next message: [mod_python] publisher handler questions Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] I apologize for the lenghty turnaround time on this issue. I did a some more testing including running the script under different users and modifying the unix privileges of the containg folders. When I redirected the output of pdf latex to a file this was the error i recieved: This is pdfTeX, Version 3.14159-14h-released-20010417 (Web2C 7.3.3.1) ! I can't write on file plotoutput112.log'. Please type another transcript file name ! Emergency stop No pages of output. when running this code exerpt: def makecsvpdf(results): """results dictionary should contain: html - the html formatting to present the file to user file - name of the output file time - timestamp(beautified) query - the query used to generate the output""" csvfile = open("/var/www/html/pcode/tmp/"+results['file'],'r') temp = "temp" csvdata="" while len(temp)!=0: temp= csvfile.readline() csvdata = csvdata+temp+"\\newline" tex = """\documentclass[12pt,letterpaper]{article} \usepackage{graphicx} \\begin{document} \section{"Comma Separated Value Output:"}"""+results['time']+""" \\newline """+csvdata+""" \end{document}""" texfile = open("/var/www/html/pcode/tmp/"+results['file'][0:len(results['file'])-4]+'.tex','w') texfile.write(tex) os.system('pdflatex --interaction nonstopmode '+"/var/www/html/pcode/tmp/"+results['file'][0:len(results['file'])-4]+'.tex > /tmp/testoutput.txt') return """ Servo Home """ The basic idea is that this file will take a text file of csv values, make a TeX file out of them, and then convert that TeX file into a pdf by directly entering the command "'pdflatex --interaction nonstopmode '+"/var/www/html/pcode/tmp/"+results['file'][0:len(results['file'])-4]+'.tex > /tmp/testoutput.txt'" into the commandline using the os module. Unfortunatly, I do not have sufficient access privalages on the system I am working on to complete the modifications so kindly suggested by Eric. Subsequently, I am attempting to find a simpler approach or find a well defined access issue to be corrected. Again, I am at a loss for a solution/explanation, any assistance/debugging advice would be much appreciated. -=Cy=- -----Original Message----- From: mod_python-bounces at modpython.org [mailto:mod_python-bounces at modpython.org]On Behalf Of Eric Walstad Sent: Friday, August 26, 2005 11:38 AM To: mod_python at modpython.org Subject: Re: [mod_python] process privileges On Friday 26 August 2005 11:08, Jon-Pierre Gentil wrote: > On Friday 26 August 2005 11:31 am, Khormaee, Cy wrote: > > I'm currently trying to run pdflatex on a machine with RedHat > > Linux Corporate 3.0 by calling the os.system() command from mod > > python. I am able to complete this operation from the command > > line python interpreter, but ill I get back when trying to run > > the command from apache/mod python all I receive is '256' and no > > changes are made to the file system. All of the folders involved > > are set for full access(unix privilege 777). My current guess is > > that this issue has something to do with apache's priority, but > > haven't been able to confirm this suspicion yet. If you can > > provide any hints on how to debug this it would be much > > appreciated. > > If you could show us some code it would help. Having a different > priority should not affect filesystem access, but running in apache > is a lot different than running manually in the interpreter, since > you would run as a completely different user and most likely not > have a home directory. I've had luck running a system process triggered with mod_python by: 1. setup the sudo file to allow the Apache process (user www-data on my debian box) to run a particular shell command. Here a sample of my sudo file: # User alias specification User_Alias APACHE = www-data # Cmnd alias specification Cmnd_Alias MOD_PYTHON_BRANCH = /path/to/shell/script.sh # User privilege specification APACHE LOCALHOST = NOPASSWD: MOD_PYTHON_BRANCH 2. Call the register_cleanup method of the mod_python request object to basically detach the system process (the shell script) from the mod_python request. You may not need to do it this way, but I did because my shell script took a long time to complete and I didn't want the web user waiting for it to complete. req.register_cleanup(buildIt, working_dir) def buildIt(working_dir): """The 'callable object' needed by req.register_cleanup. All this does is call the shell script. """ r, shell_script_output = \ commands.getstatusoutput(SHELL_SCRIPT_COMMAND % working_dir) If you search the mod_python list archives for my email address and "register_cleanup" you will find more details. I hope that helps. Eric. _______________________________________________ Mod_python mailing list Mod_python at modpython.org http://mailman.modpython.org/mailman/listinfo/mod_python ` Previous message: [mod_python] Persistent web-service Next message: [mod_python] publisher handler questions Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]