plan9fox/sys/src/9/boot/bootrc

#!/bin/rc

# mount points
mntgen -s slashn /n && chmod 666 /srv/slashn
mntgen -s slashmnt /mnt && chmod 666 /srv/slashmnt
mntgen -s mntexport /mnt/exportfs && chmod 666 /srv/mntexport

bind /root /mnt/broot
unmount /root

bind -q '#σ' /shr
bind -q '#d' /fd
bind -q '#p' /proc
for(i in ¶ P S f æ t b m)
	bind -qa '#'^$i /dev

# bind in an ip interface
for(i in I l^(0 1 2 3))
	bind -qa '#'$i /net

# usually better than 1970
cat '#r/rtc' >/dev/time >[2]/dev/null

# reparse variables
for(i in `{ls -Qp /env}){
	switch($i){
	case '*'* 'fn#'* e820 apm0 apid ifs path pid prompt status ?
		# ignore these
	case *
		$i=`{echo $$i}
	}
}

fn sigint {
	status=interrupted
}

fn fatal {
	echo $* >[1=2]
	exit $"*
}

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

fn ask {
	echo -n $1
	echo -n $2
	if(! ~ $#3 0){
		echo -n '['
		echo -n $3
		echo -n '] '
	}
	$1=`{dd -bs 64 -count 1 >[2]/dev/null}
	if(~ $#$1 0)
		$1=$3
	if(~ $"$1 '!rc'){
		rc -i
		$1=()
	}
	if(~ $#$1 0)
		ask $*
}

mt=()

fn main{
	mp=()
	while(~ $#mp 0){
		if(! ~ $#bootloop 0){
			nobootprompt=$bootloop
			# 'flatten' for the next boot
			echo -n $bootloop > '#ec/bootloop'
		}
		if(~ $#nobootprompt 0){
			echo
			showlocaldevs
			ask bootargs ' is (tcp, tls, il, local!device)' $"bootargs
		}
		if not bootargs=$nobootprompt
		nobootprompt=()
		mn=`{echo $bootargs | sed 's,!, ,'}
		ma=$mn(2-)
		mn=$mn(1)
		switch(m$"mn){
		case $mt
			mp=m$mn
			mp=$$mp
		}
	}

	# authentication agent
	if(! test -f /srv/factotum){
		# we remount ip inteface after hostowner is set
		unmount '#I' /net >[2]/dev/null

		x=(/boot/factotum -n -sfactotum)
		if(~ $service cpu)
			x=($x -S)
		if not
			x=($x -u)
		if(! ~ $#debugfactotum 0)
			x=($x -p)
		must $x

		bind -qa '#I' /net
	}

	# config method
	$mp(1) $ma

	# load keys from secstore if $auth or $secstore is not empty
	x=secstore
	if(~ $#$x 0) x=auth
	if(! ~ $#$x 0 && test -x /bin/auth/secstore && test -f /mnt/factotum/ctl){
		x=(auth/secstore -G factotum -s^$$x)
		if(~ $service cpu)
			$x -n >/mnt/factotum/ctl
		if(~ $status *readnvram* || ! ~ $service cpu)
			$x >/mnt/factotum/ctl
	}

	# connect method
	$mp(2) $ma

	# insert cfs in the pipeline
	if(test -x /bin/cfs){
		if(~ $#bootdisk 1 && ~ $#cfs 0)
			cfs=$bootdisk/cache
		if(~ $#cfs 1 && ! ~ $cfs off && test -f $cfs){
			{/bin/cfs -s -f $cfs </srv/boot &} | echo 0 >/srv/cfs
			rm /srv/boot
			mv /srv/cfs /srv/boot
		}
	}

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

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

	# compile init command
	if(~ $#init 0){
		init=/$cputype/init
		if(~ $service cpu)
			init=($init -c)
		if not
			init=($init -t)
	}

	# remove enviroment variables
	rm -f '#e/'^$mt '#e/'? '#e/'?? '#e/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/bind -ac $rootdir /

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

	exec $init
}

# keyboard and serial console
if(test -x /bin/aux/kbdfs){
	a=$console(1)
	if(! ~ $#a 0)
		a=/dev/eia^$a
	aux/kbdfs -q -s cons $a

	if(! ~$#kbmap 0){
		if(test -f /sys/lib/kbmap/$kbmap){
			echo 'setting kbmap to' $kbmap
			cat /sys/lib/kbmap/$kbmap >/dev/kbmap
		}
	}
}

# usb devices
if(test -x /bin/nusbrc && ! test -e /env/nousbrc)
	nusbrc

# load boot methods
fn showlocaldevs {}
fn configlocal {}
for(i in /rc/lib/*.rc){
	. $i
}

# add partitions and binds
configlocal

while(){
	@{main}

	# subshell doesnt wait on interrupts
	while(~ $status interrupted){wait}

	# cleanup so it can be restarted
	nobootprompt=()
	rm -f /srv/^(cfs boot cs dns)
} </dev/cons