#!/bin/rc

# desc: edit partition tables (e.g., to create a plan 9 partition)
# prereq: 

switch($1){
case go
	disks=`{ls /dev/sd*/data >[2]/dev/null | sed 's!/dev/(sd..)/data!\1!'}
	if(~ $#disks 0) {
		echo 'No disk devices were found on your system.'
		echo 'The installation process cannot continue.'
		exit giveup
	}
	
	echo 'The following disk devices were found.'
	echo
	for(i in $disks) {
		desc=`{cat /dev/$i/ctl | sed 1q | sed 's/inquiry //'}
		echo $i '-' $desc
		echo e | disk/fdisk -r /dev/$i/data >[2]/dev/null | grep -v '^   mbr'
		echo
	}
	
	okay=no
	defdisk=$disks(1)

	if(~ $#disks 1)
		default=(-d $disks)
	if not
		default=()
	prompt $default 'Disk to partition' $disks
	disk=$rd

	if(! hasmbr /dev/$disk/data) {
		echo 'The disk you selected HAS NO master boot record on its first sector.'
		echo '(Perhaps it is a completely blank disk.)'
		echo 'You need a master boot record to use the disk.'
		echo 'Should we install a default master boot record?'
		echo
		prompt 'Install mbr' y n
		switch($rd) {
		case y
			disk/mbr -m /386/mbr /dev/$disk/data
			pickdisk=done
		}
	}
	echo
	echo 'This is disk/fdisk; use it to create a Plan 9 partition.'
	echo 'If there is enough room, a Plan 9 partition will be'
	echo 'suggested; you can probably just type ''w'' and then ''q''.'
	echo
	disk/fdisk -a /dev/$disk/data
	disk/fdisk -p /dev/$disk/data >/dev/$disk/ctl >[2]/dev/null
	for(i in /dev/sd*/plan9*){
		if(test -f $i){
			d=`{basename -d $i}
			disk/prep -p $i >$d/ctl >[2]/dev/null
		}
	}

case checkdone
	# we want at least one disk with both an mbr and a plan9 partition
	mbrandplan9=0
	disks=`{ls /dev/sd*/plan9 >[2]/dev/null | sed 's!/dev/(sd..)/plan9!\1!'}
	for(disk in $disks) {
		if(hasmbr /dev/$disk/data)
			mbrandplan9=1
	}
	if(~ $mbrandplan9 0){
		partdisk=notdone
		export partdisk
	}
}