exec bash script from php website, script not running

Question

There is a website with a button, cliking the button should lunch a bash script that suppose to unmount a directory. The button calls functions.inc php script with this function:

function sftmz_release_s3test_connections($bucket_name){
    if($bucket_name == 's3test'){
        drupal_set_message('Check mount status ! - released?');
        $cmd = '/var/www/html/company/sites/default/modules/rp_minisite/admin/script.sh';
        exec($cmd);
    }
}

My problem is: When im in the shell and running the command:

/var/www/html/company/sites/default/modules/rp_minisite/admin/script.sh

It works fine.

When I click the button, the test appears, but it does not run the script. How can i view logs ? Can i print logs to shell ? i cant since its being activated using a button on html...
I assume this is permission issues?

Community · Accepted Answer · 2017-05-23 11:43:06Z

1

Try getting some more info about what actually happens when you call exec:

exec($cmd, $return, $status);
echo '<pre>';
var_dump($return);//is an array, containing the commands output
echo '</pre>';
if ($status === 0)
{//normally, if a cmd exits with 0, all is well
    echo 'Command executed';
}

If there is something funny going on, you might want to check if your script is relying on environment variables/aliases and the like being set. Perhaps you'll have to load a .profile file for the script to work.
Here you can see how to do this

edited May 23, 2017 at 11:43

CommunityBot

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answered Dec 31, 2012 at 12:14

Elias Van Ootegem

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16 Comments

ilansch Over a year ago

when i echo, i dont see anything because the echo is being run from the php script and not by me using the shell, how can i, as a root, view the echo the script sends ?

Elias Van Ootegem Over a year ago

the output of the script.sh script (STDOUT, STDERR) is redirected to the $return variable (second argument in the exec call), so the script's output can be found in $return, the echo is indeed the php script. Note: the script is being run as whichever user is running php, so you'll probably have to chmod the script so that all users can execute it

ilansch Over a year ago

i've chmod 777 the script so i guess this is enough no ?

ilansch Over a year ago

how can i view the output in the shell window or to write the return value to a file.. ? thanks

Elias Van Ootegem Over a year ago

As I said before: exec($cmd, $output); file_put_contents('tmpFile.tmp', implode('\n', $output); will write the output to a tmpFile.tmp, but this goes through php. You can easily do this by adding this to your command: $cmd .= '> tmpFile.tmp': the > redirects the STDOUT stream to the file tmpFile.tmp. Job done...

|

Brian Agnew · Accepted Answer · 2012-12-31 12:09:28Z

0

Have you checked the return value of the exec() function ? See the doc for more info.

answered Dec 31, 2012 at 12:09

Brian Agnew

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1 Comment

ilansch Over a year ago

how can i view it ? if i do exec('script.sh',$output); and then echo implode("\n", $output) i cant view it, logged as root but cant see the echo from that php script since its being run from web

bartlaarhoven · Accepted Answer · 2012-12-31 12:09:35Z

0

Try using the other arguments of the exec command..

answered Dec 31, 2012 at 12:09

bartlaarhoven

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