#!/bin/sh
# Automount hotplugged usb storage devices. Copyright (c) 2002, Wout Mertens
# This script is released under the GPL.

# The usb devices will be mounted for the console user.
# To work, this needs:
# - kernel support:
#   - hotplugging, /proc, usbdevfs and devfs
#   - as modules: usb-storage, sd_mod, scsi_mod
#   - filesystems that will be mounted, like vfat
# - ls, tr, echo, awk, basename, stat, grep, mount, umount, mkdir, rm, sed

# TODO Fix usb.agent so that /var/run/usb gets created if missing
# TODO Some rigid way of getting this run. Currently, I do
#  grep usb-storage /lib/modules/*/modules.usbmap|sed 's/usb-storage/automount_usb/' >> /etc/hotplug/usb.usermap
# TODO Lots of testing
# TODO nice way of setting options
# TODO Also, the error checking should probably be more robust
# TODO Some clean way of handling disconnects while writing.
# TODO Make a generic event system for GUIs that shows that something was
#   mounted for the user. Proposal: /etc/hotplug/gui.agent gets
#   called with ACTION=add/remove, NAME=nice_name, PATH=new_path, etc.
#   Not just for new storage, scanners and so on are useful too...

# Dump debug
mesg () {
	#return
	/usr/bin/logger -t $0 "$*"
}

# Figure out the device to mount
NUM=`basename $DEVICE|sed 's/^0*//'`
SERIAL=`awk -F= '/^T:.*/{if($0~/Dev#= *'$NUM' /){t=1}else{t=0}}t==1&&/SerialNumber/{print $2;exit}' /proc/bus/usb/devices`
PRODUCT=`awk -F= '/^T:.*/{if($0~/Dev#= *'$NUM' /){t=1}else{t=0}}t==1&&/Product/{print $2;exit}' /proc/bus/usb/devices`
# Use the serial or the product name to find which scsi host was just created
if [ -n "$SERIAL" ]; then
	SCSI=`grep -l $SERIAL /proc/scsi/usb-storage-*/*|tail -1`
elif [ -n "$PRODUCT" ]; then
	SCSI=`grep -l $PRODUCT /proc/scsi/usb-storage-*/*|tail -1`
fi

mesg Device No. $NUM, serial $SERIAL, name $PRODUCT, path $SCSI

# Mount it
if [ -n "$SCSI" ]; then
	# The name of the file is the number of the SCSI host
	SCSI=`basename $SCSI`
	PARTS=`ls /dev/scsi/host$SCSI/*/*/*/part*`
	MOUNTPATH=/mnt/usb/`echo $PRODUCT|tr '[ /?*"]' _`
	if [ -e "$MOUNTPATH" ]; then
		if mount|grep "$MOUNTPATH">/dev/null; then
			# TODO I'm too lazy to write proper collision avoidance code
			MOUNTPATH="$MOUNTPATH".$$
		fi
	fi
	# I'm hoping that mount ignores options that don't apply to the fs
	# These options should prevent abuse and make it writeable for the
	# console user.
	MOUNTOPTS='-osync,nosuid'`stat -c',uid=%u,gid=%g' /dev/console`
	mesg Mounting $PARTS on $MOUNTPATH, options $MOUNTOPTS

	[ `echo $PARTS|wc -w` -eq 1 ] && MOUNTDIRECT=1
	REMOVE=
	for i in $PARTS; do
		if [ -n "$MOUNTDIRECT" ]; then
			T=$MOUNTPATH
		else
			T=$MOUNTPATH/`basename $i`
		fi
		mkdir -p $T
		if mount $MOUNTOPTS $i $T; then
			REMOVE="umount $T;$REMOVE;rmdir $T"
		else
			rmdir $T
		fi
	done

	# Create remover
	echo "#!/bin/sh" > $REMOVER
	echo $REMOVE | sed 's/;;/;/g' >> $REMOVER
	chmod +x $REMOVER
else
	exit 1
fi