#!/usr/bin/env bash
set -e
set -x

bchroot() {
   ./root.x86_64/usr/bin/arch-chroot root.x86_64 $@
}

rchroot() {
   ./root.x86_64/usr/bin/arch-chroot root.x86_64/mnt $@
}

curl -o archlinux-bootstrap.tgz "https://ftp.fau.de/archlinux/iso/latest/archlinux-bootstrap-$(date '+%Y.%m.01')-x86_64.tar.gz"
tar xzf archlinux-bootstrap.tgz

mount --bind root.x86_64 root.x86_64
echo 'Server = https://ftp.fau.de/archlinux/$repo/os/$arch' > root.x86_64/etc/pacman.d/mirrorlist

bchroot pacman-key --init
bchroot pacman-key --populate archlinux
bchroot pacman --noconfirm -Sy gdisk
echo -e "o\ny\nn\n\n\n+1M\nef02\nn\n\n\n\n\nw\ny" | bchroot gdisk /dev/sda
echo y | bchroot mkfs.ext4 /dev/sda2
bchroot mount /dev/sda2 /mnt
bchroot pacstrap -G -M /mnt base grub linux linux-firmware openssh
bchroot genfstab -U /mnt >> root.x86_64/mnt/etc/fstab

rchroot mkinitcpio -p linux
rchroot grub-install /dev/sda
rchroot grub-mkconfig -o /boot/grub/grub.cfg

IF_NAME="$(udevadm info -q all -p /sys/class/net/eth0 | grep ID_NET_NAME_SLOT | cut -d'=' -f2)"
echo "[Match]\nName=${IF_NAME}\n\n[Network]\nDHCP=yes\n" > "root.x86_64/mnt/etc/systemd/network/${IF_NAME}.network"
rchroot systemctl enable systemd-networkd
rchroot systemctl enable systemd-resolved

curl -s 'https://archlinux.org/mirrorlist/?country=DE&protocol=https&ip_version=4&use_mirror_status=on' | awk '/^#Server/{ $1 = "Server"; print $0}' > root.x86_64/mnt/etc/pacman.d/mirrorlist
rchroot pacman-key --init
rchroot pacman-key --populate archlinux

rchroot systemctl enable sshd
mkdir root.x86_64/mnt/root/.ssh
cp authorized_keys root.x86_64/mnt/root/.ssh/

bchroot umount /mnt