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