#!/usr/bin/env nix-shell
#! nix-shell -i bash -p cryptsetup gptfdisk jq libxfs
set -xefuo pipefail

disk=$1

if mount | grep -q "$disk"; then
  echo "target device is already mounted, bailout"
  exit 2
fi

bootdev="$disk"2
luksdev="$disk"3
luksmap=/dev/mapper/crypted

# vgname=vgname


rootdev="$luksmap"
# homedev=/dev/mapper/vgname-home

read -p "LUKS Password: " lukspw

#
# partitioning
#

# http://en.wikipedia.org/wiki/GUID_Partition_Table
# undo:
#   dd if=/dev/zero bs=512 count=34 of=/dev/sda
# TODO zero last 34 blocks (lsblk -bno SIZE /dev/sda)
if ! test "$(blkid -o value -s PTTYPE "$disk")" = gpt; then
  sgdisk -og "$disk"
  sgdisk -n 1:2048:4095 -c 1:"BIOS Boot Partition" -t 1:ef02 "$disk"
  sgdisk -n 2:4096:+1G -c 2:"EFI System Partition" -t 2:ef00 "$disk"
  sgdisk -n 3:0:0 -c 3:"LUKS container" -t 3:8300 "$disk"
fi

if ! test "$(blkid -o value -s PARTLABEL "$luksdev")" = "LUKS container"; then
  echo zonk2
  exit 23
fi

if ! cryptsetup isLuks "$luksdev"; then
  # aes xts-plain64
  echo -n "$lukspw" | cryptsetup luksFormat "$luksdev" - \
      -h sha512 \
      --iter-time 5000
fi

if ! test -e "$luksmap"; then
  echo "$lukspw" | cryptsetup luksOpen "$luksdev" "$(basename "$luksmap")" -
fi

# if ! test "$(blkid -o value -s TYPE "$luksmap")" = LVM2_member; then pvcreate "$luksmap"; fi

# if ! vgdisplay -s "$vgname"; then vgcreate "$vgname" "$luksmap"; fi

# lvchange -a y /dev/mapper/"$vgname"

# if ! test -e "$rootdev"; then lvcreate -L 3G -n root "$vgname"; fi


# formatting
#

if ! test "$(blkid -o value -s TYPE "$bootdev")" = vfat; then
  mkfs.vfat "$bootdev"
fi

if ! test "$(blkid -o value -s TYPE "$rootdev")" = ext4; then
  mkfs.ext4 "$rootdev"
fi

if ! test "$(lsblk -n -o MOUNTPOINT "$rootdev")" = /mnt; then
  mkdir -p /mnt
  mount "$rootdev" /mnt
fi
if ! test "$(lsblk -n -o MOUNTPOINT "$bootdev")" = /mnt/boot; then
  mkdir -m 0000 -p /mnt/boot
  mount "$bootdev" /mnt/boot
fi

#
# dependencies for stockholm
#

# TODO: get sentinal file from target_path
mkdir -p /mnt/var/src
touch /mnt/var/src/.populate

#
# print all the infos
#

gdisk -l "$disk"
lsblk "$disk"

echo READY.
