#!/bin/rc
# turn usb disks into sd devices via sdloop(3)
rfork e
disk = ()
disks=()
name=()

fn picksd{
	p=`{awk '{print $1}' < /dev/sdctl}
	r=()
	for(i in u v w x y z)
		if(~ $#r 0 && ! ~ sd$i $p)
			r = $i
	echo $r
}

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
}

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

if(~ $#disks 0){
	if(! test -e /dev/sdU*/data){
		echo no usb disks >[1=2]
		exit nodisk
	}
	disks = `{echo /dev/sdU*/data}
}

for(d in $disks){
	if(~ $d /dev/sdU*.[0-9]*/data && test -e $d){
		if(~ $#name 0)
			name=`{picksd u}
		if(~ $#name 0){
			echo no available devices >[2=1];
			exit nodev
		}
		echo config switch on spec $name type loop/$d >/dev/sdctl
	}
	if not
		echo $d does not exist >[2=1]
}
exit ''