a script that prepares and then runs qBittorrent

qbittorrent_starter

#!/usr/bin/perl

# this is to perform any checks required before running qbittorrent
# 
#
# do NOT recursively call this current script by mistake

use common::sense;
my $debug = 1; 

my $QBITTORRENT_NOTUSED = "/usr/bin/qbittorrent"; 			# installed by apt
my $QBITTORRENT_REAL 	= "/usr/local/bin/qbittorrent"; 	# my compiled

# ----- check 1: are the torrenting directories mounted, there? --------------

my @checkPath = ( "/mnt/t/", "/usbhd/");

for my $checkfileRoot (@checkPath) {
    if (not -f "$checkfileRoot/.amMountedCheckDir_dontRemove/_checkFile_dont_remove_") {
		`xmessage \"The filesystem $checkfileRoot is not mounted properly. Exiting.\" & ` ;
		exit (0);
	}
}

if (`sudo pidof qbittorrent-nox`){
	`xmessage "qbittorent-nox was running. Killing it first" & `; 
	`killall qbittorrent-nox`;
	sleep 2;
	`killall qbittorrent-nox`;
	sleep 2;
	`killall -9 qbittorrent-nox`;
	sleep 2;

}




# ----- DONE: all checks passed: run qBittorrent --------------

# - get rid of any crashed or running-not-running copies (a problem)
my $qbtAlreadyRunning = `sudo pidof \$\( basename $QBITTORRENT_REAL \); sudo pidof \$\( basename $QBITTORRENT_NOTUSED  \)  `; 
chomp $qbtAlreadyRunning; 
if ($qbtAlreadyRunning) {
	`killall -q $QBITTORRENT_REAL`;
	`killall -q $QBITTORRENT_NOTUSED`;
	sleep 2;
	`killall -q -9 $QBITTORRENT_REAL`;
	`killall -q -9 $QBITTORRENT_NOTUSED`;
	sleep 1;
}


# try to stop qbittorrent crashing on too many files open
`ulimit -n 4000`; 



# - run qbittorrent
my $exports_graphics = "export QT_X11_NO_MITSHM=1 QT_GRAPHICSSYSTEM=raster ; ";
my $exports_libs = "LD_LIBRARY_PATH=/usr/local/lib:/usr/lib/i386-linux-gnu:\$LD_LIBRARY_PATH ; ";  
my $nice = "nice -n 20  ";		# no sudo else as root 
my $cmd = "$exports_graphics $nice $QBITTORRENT_REAL & 2>/dev/null & exit ";
print "about to run:\n$cmd\n"  
	if ($debug);
`$cmd`; 
# NOTE: the default is set in /etc/environment
# QT_GRAPHICSSYSTEM="native"		# source of my problems? 
# QT_GRAPHICSSYSTEM="raster"		# seemed good
# QT_GRAPHICSSYSTEM="opengl" 		# seemed slow
# NOTE: no reason to set the library path

sleep 1;
exit (0);