#!/bin/rc

# desc: create a boot floppy or configure hard disk to boot plan 9
# prereq: copydist

switch($1) {
case go
	echo
	echo 'Initializing Plan 9 FAT configuration partition (9fat)'
	echo
	
	fat=(/dev/sd*/9fat)
	fat=$fat(1)
	disk=`{echo $fat | sed 's:/dev/::;s:/9fat::'}
	if(! test -f /dev/$disk/9fat) {
		echo 'You have no 9fat partition.  Can''t setup booting.'
		exit
	}

	if(! test -f /tmp/plan9.ini) {
		{
			echo bootfile'='$disk!9fat!9pcdisk
			sfs=`{echo $fs | sed 's;/dev;#S;'}
			echo 'bootdisk=local!'^$sfs
			grep -v 'bootfile|bootdisk|bootargs|nobootprompt' /tmp/plan9.orig
		} >/tmp/plan9.ini
	}
	if(! test -f /tmp/plan9ini.bak)
		cp /tmp/plan9.ini /tmp/plan9ini.bak

	need9fatformat=no
	if(! isfat /dev/$disk/9fat)
		need9fatformat=yes
	if not if(! mount -c /srv/dos /n/9fat /dev/$disk/9fat >[2]/dev/null)
		need9fatformat=yes
	if not if(! test -f /n/9fat/plan9.ini)
		need9fatformat=yes

	if(~ $need9fatformat yes){
		log Initializing Plan 9 FAT partition.
		disk/format -r 2 -d -b /386/pbs \
			/dev/$disk/9fat /n/kfs/386/9load
		# silently install pbslba if the partition is way into the disk.
		# it''s our only hope.
		9fatoffset=`{grep '^part 9fat ' /dev/$disk/ctl | awk '{print $4}'}
		if(! ~ $#9fatoffset 1) {
			echo 'could not find plan 9 partition.'
			echo 'cannot happen'
			exit bad
		}
		if(test $9fatoffset -gt 16434176)	# 1024*63*255 (8.5GB) - 8MB slop
			disk/format -b /386/pbslba /dev/$disk/9fat

		mount -c /srv/dos /n/9fat /dev/$disk/9fat
	}

	if(! test -f /n/9fat/4e){
		logprog cp /n/kfs/386/9load /n/9fat/9load
		if(test -f /n/9fat/plan9.ini && ! test -f /n/9fat/plan9-3e.ini)
			logprog mv /n/9fat/plan9.ini /n/9fat/plan9-3e.ini
		if(test -f /n/9fat/9pcdisk && ! test -f /n/9fat/9pc3e)
			logprog mv /n/9fat/9pcdisk /n/9fat/9pc3e

		logprog cp /n/kfs/386/9pcdisk /n/9fat

		awk -f /bin/inst/mkini.awk >/n/9fat/plan9.ini
		>/n/9fat/4e
	}

	echo
	echo 'There are myriad ways to boot a Plan 9 system.'
	echo 'You can use any of the following.'
	echo '(You can also repeat this task to use more than one).'
	echo
	echo '  floppy - create a boot floppy'
	echo '  plan9  - make the plan 9 disk partition the default for booting'
	echo '  win9x  - add a plan 9 option to windows 9x boot menu'
	echo '  winnt  - add a plan 9 option to windows nt/2000/xp boot manager'
	echo
	echo '(See the documentation for instructions on booting Plan 9 from LILO.)'
	echo
	echo 'If you are upgrading an extant third edition installation and booting'
	echo 'from something other than a floppy, you needn''t run anything here.'
	echo 'Just type ctl-d.'

	oldbootsetup=$didbootsetup
	didbootsetup=1
	export didbootsetup
	prompt 'Enable boot method' floppy plan9 win9x winnt
	
	if(! boot$rd){
		didbootsetup=$oldbootsetup
		export didbootsetup
	}

case checkdone
	if(! isfat /dev/sd*/9fat || ! ~ $didbootsetup 1){
		bootsetup=ready
		export bootsetup
	}
}