in reply to Running Linux PovRay, Shell's okay but cron won't play

Anybody know a work around for faking an ssh session via perl? You mean like ... 
system("ssh -l theuser thehost povray ./gigtown.pov +W600 +H300");

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Is povray going to pop-up a window that is 600x300 or is it going to generate a image file of some sorts? If it is going to popup a window you might need to set the DISPLAY environment variable because I bet that is not set for cronjobs.

Plankton: 1% Evil, 99% Hot Gas.

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Re: Re: Running Linux PovRay, Shell's okay but cron won't play
by true (Pilgrim) on May 21, 2004 at 23:01 UTC
    hmm, i tried this but was unable to login via a system command. Looked at help for ssh but no password accept method. Thanks for showing me that ssh was right in front of me though.

    I take it maybe open2 will allow me to negotiate this? trying to pass ssh a password yields me errors of "Pseudo-terminal will not be allocated because stdin is not a terminal." or "Broken Pipe". :(

    Thanks for info, i do not know how to set the DISPLAY environment variable. PovRay is outputting the render to a png file, i only need it to do that. I have set povary variables for non display. Still problem is before that, in accepting parameters via automated perl. thanks for help.

    jtrue
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      funny story, a monk said to me yesterday "the answer is so obvious i'm not going to tell you". well, the answer was "use_pty", and it took me 12 hours to find it :) I solved this by using the Net::SSH::Perl of important note is use_pty to get povray to work right. This sets a pseudo tty on your remote machine. Without a proper tty, povray will not render. So if you are trying to emulate a shell, for any reason, this may be a solution for you. 
      #!/usr/bin/perl-w
use strict;
use Net::SSH::Perl;
my $host = "111.111.111.111";
my $user = "usernm";
my $pass = "passwd";
my $cmd = "povray +I/mypath/gigtown.pov";
my $ssh = Net::SSH::Perl->new($host,use_pty=>1);
$ssh->login($user, $pass);
print $ssh->cmd($cmd);
exit;

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      Final recap for povray/perl folks If you want to automate povray from outside your system. The hurdle is faking a shell. My solution involves running the above perl code inside a root crontab. This was the only solution i could come up with save from recompiling povray.
      jtrue
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