mount TOMTOM.000 TOMTOM.001 etc. files from SD-card through a raid-loop-device

tomtom_mount.sh

#!/bin/bash

TTDir="$1"
MountDir="$2"

if [ "$TTDir" == "" ]; then
	echo "empty ttdir"
	exit
fi
if [ "$MountDir" == "" ]; then
	echo "empty mountdir"
	exit
fi

sudo true

echo -n "> detecting number of loop-files"
if [ -f $TTDir/TOMTOM.010 ]; then
	echo " - to high a number found... untested... and not working"
	exit
elif [ -f $TTDir/TOMTOM.009 ]; then
	TTCnt="9"
elif [ -f $TTDir/TOMTOM.008 ]; then
	TTCnt="8"
elif [ -f $TTDir/TOMTOM.007 ]; then
	TTCnt="7"
elif [ -f $TTDir/TOMTOM.006 ]; then
	TTCnt="6"
elif [ -f $TTDir/TOMTOM.005 ]; then
	TTCnt="5"
elif [ -f $TTDir/TOMTOM.004 ]; then
	TTCnt="4"
elif [ -f $TTDir/TOMTOM.003 ]; then
	TTCnt="3"
elif [ -f $TTDir/TOMTOM.002 ]; then
	TTCnt="2"
elif [ -f $TTDir/TOMTOM.001 ]; then
	TTCnt="1"
elif [ -f $TTDir/TOMTOM.000 ]; then
	TTCnt="0"
else
	echo " - no proper TOMTOM.xxx file found"
	exit
fi
echo " - $(expr $TTCnt + 1) - done"

echo -n "> attaching loop-files to loop-devices -"
for ((cnt=0; cnt<=$TTCnt; cnt++))
do
	echo -n " $cnt"
	sudo losetup /dev/loop$cnt $TTDir/TOMTOM.00$cnt
done
echo " - done"

echo -n "> setting up a linear raid from loop-devices"
eval "sudo mdadm --build --auto=part --quiet /dev/md1 --level=linear -n4 /dev/loop[0-$TTCnt]"
echo " - done"

echo -n "> mounting the raid"
sudo mount /dev/md1 $MountDir
echo " - done"

echo ""
echo ">> TOMTOM-filesystem mounted at $MountDir"
read -p ">> press enter to unmount after you are done"
echo ""

echo -n "> unmounting the raid"
sudo umount $MountDir
echo " - done"

echo -n "> disabling the linear raid"
sudo mdadm --quiet -S /dev/md1
echo " - done"

echo -n "> disabling the loop-devices"
eval "sudo losetup -d /dev/loop[0-$TTCnt]"
echo " - done"