plan9fox/sys/src/9/boot/bootrc

#!/bin/rc

bind -q '#p' /proc

for(i in S f k æ t){
	bind -a '#'^$i /dev >/dev/null >[2=1]
}

for(i in init user nvram rootdir bootargs nobootprompt sysname \
	debugfactotum fs fsaddr auth authaddr){
	a=$$i
	$i=()
	rm -f '#e'/$i '#ec'/$i /env/$i
	if(! ~ $#a 0)
		$i=$a
}

fn fatal {
	echo $*
	exit $"*
}

fn must {
	$* || fatal $"*^': '^$status
}

fn ask {
	echo -n $1
	echo -n $2
	if(! ~ $#3 0){
		echo -n ' ['
		echo -n $3
		echo -n '] '
	}
	$1=`{read}
	if(~ $#$1 0)
		$1=$3
	if(~ $"$1 '!rc'){
		rc -i
		$1=()
	}
	if(~ $#$1 0)
		ask $*
}

mt=()
. /rc/lib/tcp.rc
. /rc/lib/local.rc

fn main{
	mp=()
	while(~ $#mp 0){
		if(~ $#nobootprompt 0){
			echo
			showlocaldevs
			ask bootargs ' is (tcp, local!device)' $bootargs
		}
		if not bootargs=$nobootprompt
		mn=`{echo $bootargs | awk -F! '{print $1}'}
		ma=`{echo $bootargs | sed 's/[^!]+!?//'}
		for(i in `{seq 1 $#mt}){
			if(~ $mt($i) m^$mn)
				mp=$$mt($i)
		}
	}

	# config method
	$mp(1) $ma

	# authentication agent
	if(! test -f /srv/factotum){
		x=(/boot/factotum -sfactotum)
		if(~ $cpuflag 1)
			x=($x -S)
		if not
			x=($x -u)
		if(! ~ $#authaddr 0)
			x=($x -a $authaddr)
		if(! ~ $#debugfactotum 0)
			x=($x -p)
		must $x
	}
	if not user=`{cat /dev/hostowner}

	# connect method
	$mp(2) $ma

	# mount and change root in new enviroment and namespace
	rfork ne

	# mount root filesystem
	if(~ $#rootdir 0)
		rootdir=/root
	must mount -c /srv/boot $rootdir

	# remove enviroment variables
	rm -f /env/^$mt /env/? /env/?? '/env/fn#'* 

	# remove part of our temporary root
	/mnt/broot/$cputype/bin/unmount /$cputype/bin /bin
	/mnt/broot/$cputype/bin/unmount /rc/bin /bin
	/mnt/broot/$cputype/bin/unmount /

	# create the name space, mount the root fs
	/mnt/broot/$cputype/bin/bind / /
	/mnt/broot/$cputype/bin/mount -ac '#s/boot' /

	# remove the remaining temporary root
	/mnt/broot/$cputype/bin/unmount /mnt/broot

	if(~ $#init 0){
		init=/$cputype/init
		if(~ $cpuflag 1)
			init=($init -c)
		if not
			init=($init -t)
	}
	exec $init
}

if(test -e '#b' && test -x /bin/aux/kbdfs){
	bind -a '#b' /dev
	aux/kbdfs -s cons
}

if(test -e '#u' && test -x /bin/usb/usbd){
	bind -a '#u' /dev
	usb/usbd
}

# bind in an ip interface
for(i in I l`{seq 0 3})
	bind -qa '#'$i /net

configlocal	# add partitions and binds

while(){
	@{main}
	sleep 1

	# cleanup so it can be restarted
	nobootprompt=()
	user=()
	rm -f /srv/boot /srv/slashn /srv/cs /srv/dns
} </dev/cons >/dev/cons >[2]/dev/cons