#!/bin/rc
# usbfat: [disk [mtpt]] - mount a USB disk's MS FAT file system,
#	which might be the only thing on the disk, or might be
#	a partition within the disk.
rfork e
disk = ()
mtpt = /n/usb

test -e /dev/usb || bind -a '#u' /dev || {
	echo no '#u/usb' >[1=2]
	exit nousb
}
test -e /dev/usbdctl || mount -a /srv/usb /dev || {
	echo cannot mount /srv/usb >[1=2]
	exit nousbd
}

disks=()
mtpt=()
switch ($#*) {
case 0
	;
case 1
	disks = $1
case 2
	disks = $1
	mtpt = $2
case *
	echo usage: $0 ' [disk [mtpt]]' >[1=2]
	exit usage
}

if(~ `{ls /n/usb >[2]/dev/null | wc -l} 0)
	mount /srv/usb /n/usb >[2]/dev/null
if (~ $#disks 0){
	disks = /dev/sdU*/data
	if(! test -e $disks(1)){
		echo no usb disks >[1=2]
		exit nodisk
	}
	disks = (/dev/sdU*/9fat /dev/sdXX/9fat /dev/sdU*/data /dev/sdXX/data)
}
for(d in $disks){
	if(! ~ $done yes) {
		if(~ $d sdU*.[0-9]* sdXX*)
			d=/dev/$d/data
		if(test -e $d){
			name=`{echo $d | sed 's/.*(sd(XX|U[0-9]+\.[0-9]+)).*/\1/'}
			if(~ $#mtpt 0)
				mnt=/n/$name
			if not
				mnt=$mtpt
			# don't mount it if it seems to be already mounted.
			# if(! test -e $mnt/* && grep -s geometry /dev/$name/ctl)
			{
				blk = `{disk/fdisk -p $d |
					awk '/^part dos / {print $3}'}
				if (! ~ $#blk 0 &&  ~ $blk [0-9]*)
					d=$d:$blk
				if (mount -c <{dossrv -sf $d >[2]/dev/null} $mnt) {
					echo $mnt
					done = yes
				}
			}
		}
		if not
			echo $d does not exist >[1=2]
	}
}
exit ''