Trouble with external script (really strange)

[alien2108]

Hi All!

I am now trobling over my problems with external script for two days. The thing is that script works as it should, just displays one number and that's it. Somehow cacti is refusing to pick that up (cacti 0.8.6g).

I have setup a Device Input method as "Script/Command" which takes one output field named "temp". Command is "<path_cacti>/scripts/ds1620_cacti". That's it.

Command (executable compiled with gcc) returns a simple number (without CR/LF):

[root@bladerunner scripts]# ./ds1620_cacti
46.00[root@bladerunner scripts]#

But when I turn debugging on in Cacti I see:

CMDPHP: Poller[0] Host[1] DS[12] CMD: /var/www/html/cacti/scripts/ds1620_cacti, output: U
CMDPHP: Poller[0] Host[1] DS[12] WARNING: Result from CMD not valid. Partial Result:

I have tried to manually run the script as cacti user and it works! What is very strange is also if I run:

php /var/www/html/cacti/poller.php

as cacti user it also works!

CMDPHP: Poller[0] Host[1] DS[12] CMD: /var/www/html/cacti/scripts/ds1620_cacti, output: 46.00

If I replace command with simple perl script to just print a number it always works. So config is OK I guess.

So what is different when cacti runs the script as supposed to when I run it as cacti user!?

Please help!

[TheWitness]

Is it a shell script? If so, how bout "/bin/sh myscript"

TheWitness

[alien2108]

No it is not shell script. it is executable. And now I did more testing. I imitated what cacti does in poller.php with:

<?php

$fp = popen("/var/www/html/cacti/scripts/ds1620_cacti","r");
$output = fgets($fp, 4096);
stream_set_timeout($fp, 25);
print("TEST=$output");

?>

If I access this through web page it works as it should. I get "TEST=44.50" displayed on page.

I tried to stick this lines into lib/poller.php to see what happens:

$ffp = popen("/var/www/html/cacti/scripts/ds1620_cacti","r");
$ff_output = fgets($ffp,4096);
cacti_log("TEST: $ff_output\n", true);

Strange! Same lines that work before now don't work.

it is total mystery to me, why it won't work in cacti. I am doing more debugging.

[alien2108]

Well using cactid instead of CMD.PHP did solve the problem, but mistery remains...