eric at ericwalstad.com
Fri Aug 26 14:38:13 EDT 2005
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.