82 lines
2.0 KiB
Bash
Executable File
82 lines
2.0 KiB
Bash
Executable File
#!/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"
|