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#!/bin/sh
# Do unmount/remount-ro. Wait.
# KILL everybody. Wait.
# Repeat.
umountcnt=2
writeout=0 # increase if your kernel does not guarantee writes to complete
# No /usr - we are expecting all binaries to be accessible
# from root fs alone
PATH=/sbin:/bin
say() {
printf "\r%s\n\r" "$*"
}
showps() {
# sleep 1 ensures that xargs will have time to start up
# this makes pslist less prone to random jitter
pslist=`{ sleep 1; ps -A -o comm=; } | sort | xargs`
pscnt=$(( `say "$pslist" | wc -w` + 0 ))
if test x"$VERBOSE" = x; then
say "* `date '+%H:%M:%S'` $pscnt processes"
else
say "* `date '+%H:%M:%S'` Processes ($pscnt): $pslist"
fi
}
say "<*> `date '+%Y-%m-%d %H:%M:%S'` Executing '$0 $*'"
showps
i="$umountcnt"
while test "$i" -gt 0; do
say "* `date '+%H:%M:%S'` Unmounting filesystems"
umount -a -n -r -f
# In case we unmounted proc...
test -e /proc/version || mount -t proc none /proc
# Remounting / RO isn't necessary when /etc/mtab is linked to /proc/mounts:
# already done. But let's be more paranoid here...
say "* `date '+%H:%M:%S'` Remounting root filesystem read-only"
mount -n -o remount,ro /
say "* `date '+%H:%M:%S'` Freeing loop devices"
for a in /dev/loop*; do
test -b "$a" && losetup -d "$a"
done
say "* `date '+%H:%M:%S'` Syncing"
sync
say "* `date '+%H:%M:%S'` Executing: killall5 -KILL"
killall5 -9
showps
i=$((i-1))
done
say "* `date '+%H:%M:%S'` Filesystem status (/proc/mounts)"
cat /proc/mounts \
| {
bad=false
while read dev mntpoint fstype opt n1 n2; do
case "$fstype" in
( proc | sysfs | usbfs | devpts | rpc_pipefs | binfmt_misc | autofs | rootfs | tmpfs | ramfs )
say "$dev $mntpoint $fstype $opt $n1 $n2"
continue
;;
esac
if test "${opt:0:2}" = "rw"; then
say "$dev $mntpoint $fstype $opt $n1 $n2 - RW!"
bad=true
else
say "$dev $mntpoint $fstype $opt $n1 $n2"
fi
done
if $bad; then
say "ERROR: we have filesystems mounted RW! Press <Enter> (^J)..."
read junk </dev/console
#sh </dev/console >&0 2>&0 # debug
fi
}
# Disk cache writeout
sleep "$writeout"
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