Re: Problems with a CGI script

[Benedikt Stefansson]

Thanks Alessandro,

I tried your idea and still couldn't get it to work. Then after fiddling around
for a few more hours I hit upon calling the Swarm program with a line like this
in the Perl program:

system "/bin/bash -c '(export HOME=$home\;$run/$program -b)'\;";

Here $home is the home directory of the user nobody, $run is the directory
where the Swarm executable is stored and $program is the name of the program.
This works, because I spawn a new bash shell and export the HOME env variable
within the subshell.

Thanks for your help.

Regards,
-Benedikt

Perrone Alessandro wrote:

> Hi
>
> >I've been writing some CGI scripts to allow me to interface with my
> >simulations and view results on the web, but the sophstication of Swarm
> >1.1. is getting me into trouble.
> That's very interesting.
> I was thinking of doing a similar thing, too.
>
> >It seems that the web server (Apache) executes the CGI script (a Perl
> >program) as user nobody. However, when the Perl script calls the Swarm
> >simulation (invoking batch mode of course), the program crashes on the
> >first invocation of the -create: setC: method in String.m, called by the
> >Archiver, line String.m:65. I can't debug this CGI invoked session
> >directly of course, but my hunch is that assert() fails because cstring
> >is a null pointer, where in this case it should contain the home
> >directory of the user. User nobody has a home, but for some reason, in
> >this case, the environment variable isn't defined.
> Have you tried to "call" the Swarm simulation indirectly, not through the
> perl script? Maybe call a file which call the simulation?
> In the PerlScript you can "call" a file on your Home directory which has
> within a line like this
> ---
> ./swarmSimulation -batchmode
> --
> (of course with x permission).
>
> I thought  to use shell scripts to do the call of the simulation, not the
> Perl script. Maybe when you call the simulation, as you say, you loose, for
> some reasons, the evironment variable.
> Tomorrow I'll try my idea, and then I'll put the result on  this list.
> Best regards.
>                                 ALEX
>
> --
>       ,,,,
>       /'^'\
>      ( o o )
> -oOOO--(_)--OOOo---------------------------------------------------
>                                 Amo parlare di niente,
>                         E' l'unico argomento di cui so tutto.
>   .oooO             Alex Perrone - address@hidden address@hidden
>   (   )   Oooo.       Home Page: http://venus.unive.it/~alex
> ---\ (----(   )----------------------------------------------------
>     \_)    ) /
>           (_/
>
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--
----------------
Benedikt Stefansson                 address@hidden
Department of Economics, UCLA       Fax. (310) 825-9528
Los Angeles, CA 90095-1477          Tel. (310) 825-1777



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