#!/bin/bash

# udev script for mounting a block device
# and processing the files it contains

# To use it, place 10-usb-detect.rules
# in /etc/udev/rules.d

# Redirect stdout and stderr to log file
LOGFILE=/var/log/usb-detect.log
exec &>> $LOGFILE

# Processing function (file name is passed as parameter)
PROC_FUNC="Rscript /home/pi/git/opus-data/OpusData.R"

# Directory inside which the processing function is run
PROC_DIR="/home/pi/git/opus-data/"

echo "USB device detected at $DEVNAME"

MOUNTPOINT=/mnt$DEVNAME

echo "Mounting device at $MOUNTPOINT"

mkdir -p $MOUNTPOINT
mount $DEVNAME $MOUNTPOINT

echo "Extracting data..."

shopt -s nullglob
found=0
for f in $MOUNTPOINT/*.[0-9]
do
	found=1
	echo "Processing $f..."
	(
		cd $PROC_DIR
		$PROC_FUNC $f
	) || echo "Failed executing $PROC_FUNC $f in $PROC_DIR"
	echo "Removing $f..."
	rm $f
done
shopt -u nullglob

[ $found -eq 0 ] && echo "$MOUNTPOINT is empty"

echo "Umounting..."
umount $MOUNTPOINT

echo "Removing $MOUNTPOINT..."
rm -r $MOUNTPOINT

if [ -z `ls -A /mnt/dev` ]
then
	echo "Removing /mnt/dev/..."
	rmdir /mnt/dev
else
	echo "Not removing /mnt/dev/ as other devices are mounted."
fi

echo "Done!"