87 lines
3.2 KiB
Bash
87 lines
3.2 KiB
Bash
#!/bin/sh
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# This script must be executed with parameter "--start" at the end of distro shutdown
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# What it does is it executes as init (process 1) and unmounts all filesystems
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# including union and the USB device (if any), so it can be cleanly removed
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#
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# Simply add the following as the last command executed by init on your distro
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# instead of the actual poweroff or shutdown command:
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#
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# exec /mnt/live/lib/cleanup --start poweroff
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# or
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# exec /mnt/live/lib/cleanup --start shutdown
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#
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# on Slackware, add this to rc.0:
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# exec /mnt/live/lib/cleanup --start /sbin/$command
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#
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# It may be needed to call this script also with --killall5 from your shutdown scripts
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# instead of calling regular killall5, to prevent fuse filesystems from being killed
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#
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# Author: Tomas M <http://www.linux-live.org/>
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#
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if [ "$1" = "--killall5" ]; then
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# kill all unneeded processes, which have smaller ID then the ID of
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# current shell's parent process. We can't use killall5, as it would kill some
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# processes which may be currently needed, for example fuse filesystems (ntfs-3g).
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for pid in $(/mnt/live/bin/ps | grep -v "PID" | grep -E -v "\[.*\]" | grep -E -v "mount|posixovl|fuse" | sed -r "s/^ +//" | cut -d " " -f 1); do
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if [ $pid -lt $PPID ]; then
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LIST="$LIST $pid"
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fi
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done
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kill -15 $LIST 2>/dev/null # SIGTERM
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sleep 2 # give processes some time to end properly
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kill -9 $LIST 2>/dev/null # SIGKILL
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fi
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if [ "$1" = "--start" ]; then
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# This is the part which is to be called from shutdown script.
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# We will assume init is running as process 1 and re-executes itself after 'telinit u'
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# So we're going to force init to stop and start this script instead as PID 1
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# If your init works differently, you may need to slightly modify few lines below
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# - without this, init would be blocking union and it couldn't be unmounted later.
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cd /mnt/live
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cp "$0" sbin/init
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pivot_root . memory/union
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echo "$2 -f" > /lib/command
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chroot /memory/union /sbin/telinit u
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fi
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if [ "$1" = "--init" ]; then
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# now we're called from init to replace the process nr 1.
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# We know that init binary reexecutes itself with --init parameter
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# All other processes are already killed
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# so our goal now is just to unmount everything and reboot/shutdown
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# First, mount proc again since it will be needed and it was already unmounted
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mount -t proc proc /proc >/dev/console 2>&1
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# next, unmount everything from union, backwards
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tac /proc/mounts | grep union | cut -d " " -f 2 | while read LINE; do
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umount $LINE >/dev/console 2>&1
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umount -l $LINE
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done
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# and free up memory mounts, backwards
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tac /proc/mounts | grep memory | cut -d " " -f 2 | while read LINE; do
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umount $LINE >/dev/console 2>&1
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umount -l $LINE
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done
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# make sure the data directory is at least remounted read-only,
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# if the previous unmount failed due to some busy err
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mount -o remount,ro /memory/data >/dev/console 2>/dev/null
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# if debug is requested, start commandline prompt here
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if grep -q debug /proc/cmdline; then
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echo "Starting shell for debug" >/dev/console
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setsid sh -c 'exec sh < /dev/tty1 >/dev/tty1 2>&1'
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fi
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cat /proc/mounts >/dev/console 2>&1
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$(cat /lib/command 2>/dev/null)
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reboot -f
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fi
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