code: plan9front

ref: 5622b0bbd878dbc34045cc6fd37cffa64461eabe
dir: /rc/bin/fshalt/

#!/bin/rc
# fshalt [-r [kernel]] - sync (flush) and, if possible, halt all file servers
#	and optionally reboot
rfork en
reboot=no
bootf=()
if(~ $1 -r){
	reboot=yes
	shift
}
if not if(! ~ $#* 0 && ! ~ $#* 1){
	echo usage: $0 '[-r bootkern]' >[1=2]
	exit usage
}

if(~ $reboot yes && ~ $#* 1){
	bootf=$1
	if(! ~ $bootf /*)
		bootf=`{builtin pwd}^/$bootf
}

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}
e=`{ls /srv/ext4*cmd >[2]/dev/null}
s=`{awk '/^sd./ {print substr($1,3,1)}' '#S/sdctl' >[2]/dev/null}

# for scram, don't scram other systems
bind -b '#P' /dev >[2]/dev/null

# 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/test /tmp
if(~ $#bootf 1){
	if(! cp $bootf /tmp/bootf)
		exit 'failed to copy kernel'
	bootf=/bin/bootf
}
if not {
	mkdir /tmp/aux
	cp /bin/aux/acpi /tmp/aux
	cp /bin/scram /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 $e)
		echo halt >>$i
	for(i in $c $h $e){
		echo -n $i...
		while(test -e $i)
			sleep 1
	}
	echo
	echo done halting

	# turn off disk drives
	for(i in $s)
		echo config spec $i switch off >>'#S/sdctl'

	if(~ $reboot yes){
		echo rebooting...
		echo reboot $bootf >'#c/reboot'
	}
	if not {
		scram
		echo 'It''s now safe to turn off your computer'
	}
}

x