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POBash script hangs when called from php or python
 

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  1. POBash script hangs when called from php or python
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    <p>I'm a novice at bash and I wrote a bash script that reads a large syslog file from end to start, looks for the entries that belong to a given minute (the minute before the last) and then counts how many ocurrences each of the given patterns has in that minute. It doesn't work if run from PHP/Python, but it works if I call it directly like this:</p> <p><code>sh /path/to/logparser.sh /path/to/big.log '2013-09-23T08:38' '2013-09-23T08:37' 'MySQL has gone away' 'Unhandled Error timed out'</code></p> <p>Below is the code of <code>logparser.sh</code>:</p> <pre><code>logfile=$1 echo $logfile shift minute=$1 echo $minute shift minute_before=$1 echo $minute_before shift command="tac $logfile | sed -n -e '/$minute/p' -e '/$minute_before/q'" echo $command if [ -f $logfile ]; then buffer=$(eval $command) echo "buffer complete" exit 1 fi </code></pre> <p>Side notes:</p> <ul> <li>I've used <code>buffer=$(eval $command)</code> because <code>buffer=$(tac $logfile | sed -n -e '/$minute/p' -e '/$minute_before/q')</code> hangs even in the command line</li> <li>I've used <code>-e '/$minute_before/q'</code> in sed because I couldn't get `-e '/$minute/!q' to work</li> </ul> <p>But when I run it from PHP via <code>pasthru()</code> or from Python via <code>subprocess.Popen().communicate()</code> it hangs. If I check the processes with <code>ps -ef r</code> I see that <code>tac</code> is still running.</p> <p>Here's the PHP code that calls the bash script:</p> <pre><code>$env = $argv[1]; $service_name = $argv[2]; $logfile = $argv[3]; $minute = $argv[4]; $minute_before = $argv[5]; $command = 'sh '.dirname(__FILE__).'/logparser.sh '; $n = count($argv); for($i=3; $i&lt;$n; $i++){ $command .= ' ' . escapeshellarg($argv[$i]); } $command .= "\n"; echo "\npassthru {$command}"; passthru($command, $out); var_dump($out); exit(); </code></pre> <p>Here's the Python code that calls the bash script:</p> <pre><code>env = sys.argv[1] service_name = sys.argv[2] logfile = sys.argv[3] minute = sys.argv[4] minute_before = sys.argv[5] args = ['sh', '%s/logparser.sh' % os.getcwd()] for i in range(3, len(sys.argv)): args.append(sys.argv[i]) print args output = subprocess.Popen(args, stdout=subprocess.PIPE).communicate() print output </code></pre> <p>Other stuff that I've rules out:</p> <ul> <li>exec permissions: both PHP and Python can run and get the results of linux commands like <code>whoami</code></li> <li>file permissions: both PHP and Python run perfectly for a simpler bash script, e.g. a file containing the <code>date</code> liunx command; the log file has read permissions for all</li> <li>bad params: I've compared in the bash script the params send by PHP/Python and the params sent via command line, they're identical</li> </ul> <p>How could I make it work called from PHP/Python?</p>
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