#!/bin/rc
# fshalt [-r] [new-kernel] - sync (flush) and, if possible, halt all
#	file servers and optionally reboot
rfork nes
kern=()
kerncopy=()
reboot=no
fn usage {
	echo usage: $1 '[-r] [new-kernel]' >[1=2]
	exit usage
}
if (! ~ $#* 0)
	switch ($1) {
	case -r
		reboot=yes
		shift
	case -*
		usage $0
	}
switch ($#*) {
case 0
case 1
	kern = $1
case *
	usage $0
}

path=(/bin)
builtin cd /
9fs boot		# in case of odd namespace
ramfs			# stash files here that we'll need after the fs halts

setrtc

# turn off graphics, if any
if (test -e '#v/vgactl' && test -e '#P/realmode') {
	vgatype=`{read '#v/vgactl'}
	if (! ~ $vgatype(2) cga) {
		prompt=''
		kill rio | rc -i &
		sleep 2
		aux/vga -l text
	}
}

fn isbootable {
	test -e $1 && ~ `{file $1} *' plan 9 boot image' \
		*' plan 9 executable'* *ELF*' executable'
}
fn usekernel {
	kerncopy=kern
	cp $1 /tmp/$kerncopy && echo -n using kernel $1...
}

# make a copy of the right kernel
if (~ $reboot yes) {
	if (~ $#kern 0)
		kern=`{echo $terminal |
			sed 's;^([^ ]+) .*/([^/ ]+).*$;/n/boot/'$cputype'/9\2;'}
	if (isbootable $kern)
		usekernel $kern
	if not {
		# $kern is probably a raw binary, try s^name as boot image
		kern=`{ echo $kern | sed 's;.*/;&s;' }
		if (isbootable $kern)
			usekernel $kern
		if not
			echo -n using default kernel...
	}
}

# start venti flushing
venti/sync -h localhost >[2]/dev/null &
venti/sync  >[2]/dev/null &

unmount /mnt/consoles >[2]/dev/null
kill consolefs | rc			# don't compete with /mnt/consoles
kill cron | rc				# unlock /cron/lock
kill watchdog | rc
sleep 1

f=`{ls /srv/fscons*>[2]/dev/null}
k=`{ls /srv/kfs*cmd >[2]/dev/null|sort -r}

echo -n syncing...
for(i in $f) @ {
	echo -n $i...
	{
		echo
		dial/drain &
		sleep 2
		echo fsys all sync
		if(! dial/expect -t 120 ': ')
			echo -n 'not synced...' > /dev/cons
	} < $i >> $i
}

# flush the last bit of possible fossil traffic
if (ls /srv | grep -s fossil) {
	echo -n venti...
	venti/sync -h localhost >[2]/dev/null &
	venti/sync  >[2]/dev/null &
	sleep 5
}

for (i in $k){
	echo -n $i... 
	switch($i){
	case /srv/kfs.cmd
		disk/kfscmd sync
	case *
		disk/kfscmd -n `{echo $i | sed -n 's%/srv/kfs.(.*).cmd%\1%p'} sync
	}
	sleep 2
}

# halting (binaries we run can't be on the fs we're halting)
builtin cd /bin
cp dial/expect echo disk/kfscmd rc sed /tmp
builtin cd /tmp
mkdir /tmp/lib
cp /rc/lib/rcmain /tmp/lib
bind /tmp /rc
bind /tmp /bin

# put this in a shell function so this rc script doesn't get read
# when it's no longer accessible
fn x {
	rfork s
	echo
	echo -n halting...
	for(i in $f) @ {
		echo -n $i...
		{
			echo fsys all halt
			if(! expect -t 60 ': ')
				echo -n 'not halted...' > /dev/cons
		} < $i >> $i
	}
	
	for (i in $k){
		echo -n $i... 
		switch($i){
		case /srv/kfs.cmd
			kfscmd halt
		case *
			kfscmd -n `{echo $i | sed -n 's%/srv/kfs.(.*).cmd%\1%p'} halt
		}
	}
	echo
	echo done halting

	if (~ $reboot yes)
		echo reboot $kerncopy >'#c/reboot'
}

x