#!/busybox sh

die() {
    echo ""
    echo "Shit broke! Panic shell!"
    echo ""
    /busybox --install -s
    exec /bin/sh
}


info() {
    echo -n "-|-" ${@} "... "
}

isok() {
    if [[ $1 -eq 0 ]]; then
        echo "[ OK ]"
    else
        echo "[ FUCK ]"
        die
    fi
}

info "disabling console blanking, hopefully"
echo -e '\033[9;0]\033[14;0]' > /dev/console

info "waiting for usb devices to settle"
echo ""
for i in 10 9 8 7 6 5 4 3 2 1 0; do
    echo -en ${i}'\r'
    /busybox sleep 1
done
echo ""
isok 0

info "mounting devtmpfs"
/busybox mount -n -t devtmpfs devtmpfs ./dev
isok $?

info "mounting proc"
/busybox mount -n -t proc proc ./proc
isok $?

# rootfs_location_uuid=f822d881-d88a-4200-a9cf-6986c5a3e69a
info "looking for device with rootfs"
for var in $(cat /proc/cmdline); do
    if [[ ${var/=*} = rootfs_location_uuid ]]; then
        uuid="${var/*=}"
    fi
done
device=$(findfs UUID=${uuid})
isok $?

# rootfs_filename=rootfs.tar.xz
info "getting rootfs filename"
for var in $(cat /proc/cmdline); do
    if [[ ${var/=*} = rootfs_filename ]]; then
        filename="${var/*=}"
    fi
done
if [[ -z ${filename} ]]; then
    info "going with default: rootfs.tar.xz"
    filename="rootfs.tar.xz"
fi
isok 0

info "getting root tmpfs size"
for var in $(cat /proc/cmdline); do
    if [[ ${var/=*} = rootfs_size ]]; then
        size=${var/*=}
    fi
done
if [[ -z ${size} ]]; then
    info "going with default: 4G"
    size="4G"
fi
isok 0

info "trying to mount ${device}"
/busybox mount -n -o ro ${device} /mnt
isok $?

info "trying to mount root tmpfs"
/busybox mount -n -o size=${size} -t tmpfs roottmpfs /roottmpfs
isok $?

info "checking if ${filename} exists"
[[ -e /mnt/${filename} ]]
isok $?

info "unpacking; will take some time"
/pv /mnt/${filename} | /busybox tar -C /roottmpfs -xJf -

info "unmounting rootfs package location"
/busybox umount -n /mnt
isok $?

info "unmounting /dev"
/busybox umount -n /dev
isok $?

info "unmounting /proc"
/busybox umount -n /proc
isok $?

info "trying to switch root"
exec /busybox switch_root /roottmpfs /sbin/init

echo ""
echo "we should not reach this place! here be dragons!"
echo ""

die