ISO/archiso/archiso_shutdown

#!/bin/ash

# /oldroot depends on things inside /oldroot/run/archiso...
mkdir /oldrun
mount --move /oldroot/run /oldrun

# Unmount all mounts now.
umount $(mount | awk '$3 ~/^\/oldroot/ {print $3}' | sort -r)

# Remove all dm-snapshot devices.
dmsetup remove_all

# Remove all loopback devices made for dm-snapshots devices
# other misc loops like used for pure squashfs images
# and unmount/detach *.fs.sfs images.
for _lup in $(ls -r /dev/loop[1-9][0-9][0-9]); do
    if ! losetup -d ${_lup} 2> /dev/null; then
        umount -d ${_lup}
    fi
done

# Unmount the space used to store *.cow.
umount /oldrun/archiso/cowspace

# Unmount boot device if needed (no copytoram=y used)
if [[ ! -d /oldrun/archiso/copytoram ]]; then
    umount /oldrun/archiso/bootmnt
    # Detach img_loop= and unmount img_dev= (archiso_loop_mnt hook)
    if [[ -f /oldrun/archiso/img_dev_loop ]]; then
        losetup -d $(cat /oldrun/archiso/img_dev_loop)
        umount /oldrun/archiso/img_dev
    fi
    if [[ -f /oldrun/archiso/nbd_client.pid ]]; then
        nbd-client -d /dev/nbd0
    fi
fi

# reboot / poweroff / halt, depending on the argument passed by init
# if something invalid is passed, we halt
case "$1" in
  reboot|poweroff|halt) "$1" -f ;;
  *) halt -f;;
esac