#! /bin/sh

PATH=/usr/sbin:/usr/bin:/sbin:/bin
NAME=live

# Exit if system was not booted by live
grep -qs boot=live /proc/cmdline || exit 0

# Exit if the system was booted from an ISO image rather than a physical CD
grep -qs find_iso= /proc/cmdline && exit 0

# Try to cache everything we're likely to need after ejecting.  This
# is fragile and simple-minded, but our options are limited.
cache_path() {
    path="$1"

    if [ -d "$path" ]; then
        for f in $(find "$path" -type f); do
            cache_path "$f"
        done
    elif [ -f "$path" ] && [ ! -L "$path" ]; then
        if [ -x "$path" ]; then
            if file -L "$path" | grep -q 'dynamically linked'; then
                for lib in $(ldd "$path" | awk '{ print $3 }'); do
                    cache_path "$lib"
                done
            fi
        fi
        echo -n >> "$path"
    fi
}

do_stop ()
{
    logger -t ${NAME} "caching reboot files..."

    # check for netboot
    if [ ! -z "${NETBOOT}" ] || grep -qs netboot /proc/cmdline || grep -qsi root=/dev/nfs /proc/cmdline  || grep -qsi root=/dev/cifs /proc/cmdline ; then
        return 0
    fi

    prompt=1
    if grep -qs noprompt /proc/cmdline; then
        prompt=
    fi

    for path in $(which halt) $(which reboot) /etc/rc?.d /etc/default $(which stty) /bin/plymouth /usr/lib/*/plymouth /lib/systemd /etc/systemd /lib/*/libnss_files* /etc/nsswitch.conf /usr/share/fonts/truetype/dejavu/DejaVuSans.ttf /usr/share/fonts/truetype/ubuntu/Ubuntu-R.ttf /usr/share/fonts/truetype/ubuntu/UbuntuMono-R.ttf /etc/fonts/fonts.conf /etc/fonts/conf.d/60-latin.conf; do
        cache_path "$path"
    done

    device="$(grep " /run/live/medium " /proc/mounts | cut -d' ' -f1)" || device=
    pkname="$(lsblk -no pkname $device)" || pkname=

    # If /run/live/medium isn't mounted, don't try to eject it
    if [ -z "$device" ]; then
        return 0
    fi

    # If the device exists but can't be found in /sys/block, it's most likely a partition
    # so unmount it (lazy mode) and sync
    if [ -b "$device" ] && [ ! -f "/sys/block/$(basename $device)/removable" ] && [ ! -f "/sys/block/$pkname/removable" ]; then
        umount -l $device >/dev/null 2>&1
        sync
        return 0
    fi

    # If we're still there, then we're probably a cdrom or other media
    # skip the eject if the kernel says the media isn't removable
    if [ "$(cat /sys/block/$(basename $device)/removable)" = "0" ] || [ "$(cat /sys/block/$pkname/removable)" = "0" ]; then
        return 0
    fi

    # XXX - i18n
    MSG="Please remove the installation medium, then press ENTER. "
    MSG_FALLBACK="Please remove the installation medium, then reboot."

    if [ "$prompt" ]; then
        plymouth hide-splash
        clear > /dev/tty1
        echo $MSG_FALLBACK > /dev/tty1
        stty sane < /dev/console
        echo $MSG > /dev/console
    fi

    umount /lib/live/mount/rootfs/filesystem.squashfs >/dev/null 2>&1
    umount /lib/live/mount/overlay >/dev/null 2>&1
    umount /lib/live/mount >/dev/null 2>&1
    eject -p -m $device >/dev/null 2>&1

    if [ "$prompt" ]; then
        read x < /dev/console
    fi
}

do_stop

