#!/bin/bash

# install parameters
# the storage device on which arch linux shall be installed
storage_device='/dev/sda'

# boot mode: efi or bios, default=None the install script will determine the boot mode
# boot_mode='efi'

# encryption password
encryption_password='barfoo'

# additional packages to install
base='grub efibootmgr stow tmux git vim python3 wpa_supplicant'

# make command silent
s() {
	$* >/dev/null 2>&1
}


echo "checking internet connection"
s ping -c1 archlinux.org
if [[ "$?" -ne 0 ]]; then
	echo "internet connection needed"
	exit 1
fi

echo "determining boot mode"
if [[ ! "$boot_mode" ]]; then
	s ls /sys/firmware/efi/efivars
	if [[ "$?" -eq 0 ]]; then
		boot_mode='efi'
	else
		boot_mode='bios'
	fi
fi

echo "updating system clock"
s timedatectl set-ntp true

echo "creating partitions"
s wipefs -af "$storage_device"
if [[ "$boot_mode" == "efi" ]]; then
	sgdisk -n "1:2048:+1G" -t "1:EF00" "$storage_device"
else
	sgdisk -n "1:2048:+1G" -t "1:EF02" "$storage_device"
fi
sgdisk -n "2:0:0" -t "2:8309" "$storage_device"
echo "$encryption_password" | cryptsetup -q luksFormat --type luks1 "${storage_device}2"
echo "$encryption_password" | cryptsetup -q open "${storage_device}2" lvm

echo "creating lvm"
s pvcreate /dev/mapper/lvm
s vgcreate vg /dev/mapper/lvm
s lvcreate -L 8G vg -n swap
s lvcreate -l 100%FREE vg -n root

echo "formatting filesystems"
if [[ "$boot_mode" == "efi" ]]; then
	s mkfs.vfat -F32 "${storage_device}1"
else
	s mkfs.vfat "${storage_device}1"
fi
s mkfs.ext4 /dev/vg/root
s mkswap /dev/cg/swap

echo "mounting filesystems"
s mount /dev/vg/root /mnt
if [[ "$boot_mode" == "efi" ]]; then
	s mkdir /mnt/efi
	s mount "${storage_device}1" /mnt/efi
else
	s mkdir /mnt/boot
	s mount "${storage_device}1" /mnt/boot
fi

echo "installing base system"
pacstrap /mnt base

echo "generating fstab"
s genfstab -U /mnt >> /mnt/etc/fstab