#!/bin/bash


function first_stage(){
	set -e
	echo foo first_stage
		
	echo -n luks_password: 
	read -s luks_password
	
	lsblk -ftpo NAME,FSTYPE,LABEL,UUID,FSAVAIL,MOUNTPOINT
	select DEVICE in $(lsblk -frpno NAME); do
	echo using $DEVICE
	break
	done
	
	apt install -y debootstrap cryptsetup btrfs-progs lvm2
	
	if [ -d /dev/vg0 ]; then
		swapoff /dev/vg0/swap || true
		vgchange -an /dev/vg0
	fi
	
	if [ -b /dev/mapper/cryptlvm ]; then
		cryptsetup luksClose cryptlvm
	fi
	
	wipefs -a ${DEVICE}
	
	(
	echo o
	echo n
	echo p
	echo 1
	echo
	echo +2G
	echo n
	echo p
	echo 2
	echo
	echo 
	echo w
	) | fdisk ${DEVICE}
	
	echo mkfs.ext4 ${DEVICE}1
	yes | mkfs.ext4 ${DEVICE}1
	
	(
	echo $luks_password
	echo $luks_password	
	)| cryptsetup luksFormat ${DEVICE}2
	echo $luks_password | cryptsetup luksOpen ${DEVICE}2 cryptlvm
	pvcreate /dev/mapper/cryptlvm
	vgcreate vg0 /dev/mapper/cryptlvm
	
	LVM_SIZE=$(dev_size /dev/mapper/cryptlvm)
	
	SWAP_SIZE=$(($(mem_size)/1000/1000))
	ROOT_SIZE=$(($LVM_SIZE/1024/1024-SWAP_SIZE))
	
	echo lvcreate /dev/vg0 --name=root --size=${ROOT_SIZE}M
	lvcreate /dev/vg0 --name=root --size=${ROOT_SIZE}M
	yes | mkfs.btrfs /dev/vg0/root
	
	echo lvcreate /dev/vg0 --name=swap --size=${SWAP_SIZE}M
	lvcreate /dev/vg0 --name=swap --size=${SWAP_SIZE}M
	mkswap /dev/vg0/swap
	swapon /dev/vg0/swap
	
	echo mount /dev/vg0/root $TARGET
	mount /dev/vg0/root $TARGET
	
	echo debootstrap sid $TARGET
	debootstrap sid $TARGET
	
	mount ${DEVICE}1 $TARGET/boot
	echo mount ${DEVICE}1 $TARGET/boot
	
	genfstab -U $TARGET | tee $TARGET/etc/fstab
	UUID=$(lsblk -lpo NAME,UUID | grep ${DEVICE}2 | awk '{print $2}')
	echo cryptlvm UUID=${UUID} none luks > $TARGET/etc/crypttab
}

function second_stage(){
	set -e
	echo bar second_stage
	passwd
	echo -n > /etc/motd
	apt install -y linux-image-amd64 grub2 cryptsetup btrfs-progs lvm2 locales tzdata keyboard-configuration console-common
	mkdir /snap
	btrfs subvolume snapshot / /snap/$(date +%Y-%m-%d_basesystem)
	apt install -y task-mate-desktop mate-desktop-environment-extra
	
}

function post_install_stage(){
	sleep 0.5
    mount | grep target | awk '{print $3}'| sort -r | while read LINE; do
        umount -l $LINE;
    done
}