plan9fox/rc/bin/fshalt

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

path=(/bin)
builtin cd /
bind -c '#s' /srv
bind '#p' /proc

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

c=`{ls /srv/cwfs*cmd >[2]/dev/null}
h=`{ls /srv/hjfs*cmd >[2]/dev/null}

# for scram, don't scram other systems
bind -b '#P' /dev
if(! ~ $reboot yes){
	if (test -e '#P'/apm)
		scram=yes
	if (test -e '#P'/acpitbls -a -e '#P'/iow)
		scram=yes
}

# halting (binaries we run can't be on the fs we're halting)
ramfs
builtin cd /tmp
cp /bin/echo /tmp
mkdir /tmp/lib
cp /rc/lib/rcmain /tmp/lib
cp /bin/ns /tmp
cp /bin/rc /tmp
cp /bin/sed /tmp
cp /bin/sleep /tmp
cp /bin/scram /tmp
cp /bin/test /tmp
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 {
	echo
	echo -n halting...
	for (i in $c $h)
		echo halt >>$i
	for (i in $c $h){
		echo -n $i...
		while(test -e $i)
			sleep 1
	}
	echo
	echo done halting

	if (~ $reboot yes) {
		echo rebooting...
		echo reboot >'#c/reboot'
	}
	if (~ $scram yes){
		scram
		echo 'It''s now safe to turn off your computer'
	}
}

x